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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 22:20:36 (GMT)
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 22:20:36 (GMT)
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/decnet
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/decnet')
-rw-r--r--net/decnet/Kconfig27
-rw-r--r--net/decnet/Makefile10
-rw-r--r--net/decnet/README8
-rw-r--r--net/decnet/TODO41
-rw-r--r--net/decnet/af_decnet.c2405
-rw-r--r--net/decnet/dn_dev.c1481
-rw-r--r--net/decnet/dn_fib.c802
-rw-r--r--net/decnet/dn_neigh.c627
-rw-r--r--net/decnet/dn_nsp_in.c934
-rw-r--r--net/decnet/dn_nsp_out.c782
-rw-r--r--net/decnet/dn_route.c1840
-rw-r--r--net/decnet/dn_rules.c416
-rw-r--r--net/decnet/dn_table.c825
-rw-r--r--net/decnet/dn_timer.c109
-rw-r--r--net/decnet/netfilter/Kconfig15
-rw-r--r--net/decnet/netfilter/Makefile6
-rw-r--r--net/decnet/netfilter/dn_rtmsg.c167
-rw-r--r--net/decnet/sysctl_net_decnet.c480
18 files changed, 10975 insertions, 0 deletions
diff --git a/net/decnet/Kconfig b/net/decnet/Kconfig
new file mode 100644
index 0000000..2101da5
--- /dev/null
+++ b/net/decnet/Kconfig
@@ -0,0 +1,27 @@
+#
+# DECnet configuration
+#
+config DECNET_ROUTER
+ bool "DECnet: router support (EXPERIMENTAL)"
+ depends on DECNET && EXPERIMENTAL
+ ---help---
+ Add support for turning your DECnet Endnode into a level 1 or 2
+ router. This is an experimental, but functional option. If you
+ do say Y here, then make sure that you also say Y to "Kernel/User
+ network link driver", "Routing messages" and "Network packet
+ filtering". The first two are required to allow configuration via
+ rtnetlink (you will need Alexey Kuznetsov's iproute2 package
+ from <ftp://ftp.tux.org/pub/net/ip-routing/>). The "Network packet
+ filtering" option will be required for the forthcoming routing daemon
+ to work.
+
+ See <file:Documentation/networking/decnet.txt> for more information.
+
+config DECNET_ROUTE_FWMARK
+ bool "DECnet: use FWMARK value as routing key (EXPERIMENTAL)"
+ depends on DECNET_ROUTER && NETFILTER
+ help
+ If you say Y here, you will be able to specify different routes for
+ packets with different FWMARK ("firewalling mark") values
+ (see ipchains(8), "-m" argument).
+
diff --git a/net/decnet/Makefile b/net/decnet/Makefile
new file mode 100644
index 0000000..e44003a
--- /dev/null
+++ b/net/decnet/Makefile
@@ -0,0 +1,10 @@
+
+obj-$(CONFIG_DECNET) += decnet.o
+
+decnet-y := af_decnet.o dn_nsp_in.o dn_nsp_out.o \
+ dn_route.o dn_dev.o dn_neigh.o dn_timer.o
+decnet-$(CONFIG_DECNET_ROUTER) += dn_fib.o dn_rules.o dn_table.o
+decnet-y += sysctl_net_decnet.o
+
+obj-$(CONFIG_NETFILTER) += netfilter/
+
diff --git a/net/decnet/README b/net/decnet/README
new file mode 100644
index 0000000..60e7ec8
--- /dev/null
+++ b/net/decnet/README
@@ -0,0 +1,8 @@
+ Linux DECnet Project
+ ======================
+
+The documentation for this kernel subsystem is available in the
+Documentation/networking subdirectory of this distribution and also
+on line at http://www.chygwyn.com/DECnet/
+
+Steve Whitehouse <SteveW@ACM.org>
diff --git a/net/decnet/TODO b/net/decnet/TODO
new file mode 100644
index 0000000..ebb5ac6
--- /dev/null
+++ b/net/decnet/TODO
@@ -0,0 +1,41 @@
+Steve's quick list of things that need finishing off:
+[they are in no particular order and range from the trivial to the long winded]
+
+ o Proper timeouts on each neighbour (in routing mode) rather than
+ just the 60 second On-Ethernet cache value.
+
+ o Support for X.25 linklayer
+
+ o Support for DDCMP link layer
+
+ o The DDCMP device itself
+
+ o PPP support (rfc1762)
+
+ o Lots of testing with real applications
+
+ o Verify errors etc. against POSIX 1003.1g (draft)
+
+ o Using send/recvmsg() to get at connect/disconnect data (POSIX 1003.1g)
+ [maybe this should be done at socket level... the control data in the
+ send/recvmsg() calls should simply be a vector of set/getsockopt()
+ calls]
+
+ o check MSG_CTRUNC is set where it should be.
+
+ o Find all the commonality between DECnet and IPv4 routing code and extract
+ it into a small library of routines. [probably a project for 2.7.xx]
+
+ o Add perfect socket hashing - an idea suggested by Paul Koning. Currently
+ we have a half-way house scheme which seems to work reasonably well, but
+ the full scheme is still worth implementing, its not not top of my list
+ right now.
+
+ o Add session control message flow control
+
+ o Add NSP message flow control
+
+ o DECnet sendpages() function
+
+ o AIO for DECnet
+
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
new file mode 100644
index 0000000..29bb3cd
--- /dev/null
+++ b/net/decnet/af_decnet.c
@@ -0,0 +1,2405 @@
+
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Socket Layer Interface
+ *
+ * Authors: Eduardo Marcelo Serrat <emserrat@geocities.com>
+ * Patrick Caulfield <patrick@pandh.demon.co.uk>
+ *
+ * Changes:
+ * Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
+ * version of the code. Original copyright preserved
+ * below.
+ * Steve Whitehouse: Some bug fixes, cleaning up some code to make it
+ * compatible with my routing layer.
+ * Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
+ * Caulfield.
+ * Steve Whitehouse: Further bug fixes, checking module code still works
+ * with new routing layer.
+ * Steve Whitehouse: Additional set/get_sockopt() calls.
+ * Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
+ * code.
+ * Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
+ * way. Didn't manage it entirely, but its better.
+ * Steve Whitehouse: ditto for sendmsg().
+ * Steve Whitehouse: A selection of bug fixes to various things.
+ * Steve Whitehouse: Added TIOCOUTQ ioctl.
+ * Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
+ * Steve Whitehouse: Fixes to connect() error returns.
+ * Patrick Caulfield: Fixes to delayed acceptance logic.
+ * David S. Miller: New socket locking
+ * Steve Whitehouse: Socket list hashing/locking
+ * Arnaldo C. Melo: use capable, not suser
+ * Steve Whitehouse: Removed unused code. Fix to use sk->allocation
+ * when required.
+ * Patrick Caulfield: /proc/net/decnet now has object name/number
+ * Steve Whitehouse: Fixed local port allocation, hashed sk list
+ * Matthew Wilcox: Fixes for dn_ioctl()
+ * Steve Whitehouse: New connect/accept logic to allow timeouts and
+ * prepare for sendpage etc.
+ */
+
+
+/******************************************************************************
+ (c) 1995-1998 E.M. Serrat emserrat@geocities.com
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+HISTORY:
+
+Version Kernel Date Author/Comments
+------- ------ ---- ---------------
+Version 0.0.1 2.0.30 01-dic-97 Eduardo Marcelo Serrat
+ (emserrat@geocities.com)
+
+ First Development of DECnet Socket La-
+ yer for Linux. Only supports outgoing
+ connections.
+
+Version 0.0.2 2.1.105 20-jun-98 Patrick J. Caulfield
+ (patrick@pandh.demon.co.uk)
+
+ Port to new kernel development version.
+
+Version 0.0.3 2.1.106 25-jun-98 Eduardo Marcelo Serrat
+ (emserrat@geocities.com)
+ _
+ Added support for incoming connections
+ so we can start developing server apps
+ on Linux.
+ -
+ Module Support
+Version 0.0.4 2.1.109 21-jul-98 Eduardo Marcelo Serrat
+ (emserrat@geocities.com)
+ _
+ Added support for X11R6.4. Now we can
+ use DECnet transport for X on Linux!!!
+ -
+Version 0.0.5 2.1.110 01-aug-98 Eduardo Marcelo Serrat
+ (emserrat@geocities.com)
+ Removed bugs on flow control
+ Removed bugs on incoming accessdata
+ order
+ -
+Version 0.0.6 2.1.110 07-aug-98 Eduardo Marcelo Serrat
+ dn_recvmsg fixes
+
+ Patrick J. Caulfield
+ dn_bind fixes
+*******************************************************************************/
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/inet.h>
+#include <linux/route.h>
+#include <linux/netfilter.h>
+#include <linux/seq_file.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <net/flow.h>
+#include <asm/system.h>
+#include <asm/ioctls.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/dn.h>
+#include <net/dn_nsp.h>
+#include <net/dn_dev.h>
+#include <net/dn_route.h>
+#include <net/dn_fib.h>
+#include <net/dn_neigh.h>
+
+struct dn_sock {
+ struct sock sk;
+ struct dn_scp scp;
+};
+
+static void dn_keepalive(struct sock *sk);
+
+#define DN_SK_HASH_SHIFT 8
+#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
+#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
+
+
+static struct proto_ops dn_proto_ops;
+static DEFINE_RWLOCK(dn_hash_lock);
+static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
+static struct hlist_head dn_wild_sk;
+
+static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
+static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
+
+static struct hlist_head *dn_find_list(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ if (scp->addr.sdn_flags & SDF_WILD)
+ return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
+
+ return &dn_sk_hash[scp->addrloc & DN_SK_HASH_MASK];
+}
+
+/*
+ * Valid ports are those greater than zero and not already in use.
+ */
+static int check_port(unsigned short port)
+{
+ struct sock *sk;
+ struct hlist_node *node;
+
+ if (port == 0)
+ return -1;
+
+ sk_for_each(sk, node, &dn_sk_hash[port & DN_SK_HASH_MASK]) {
+ struct dn_scp *scp = DN_SK(sk);
+ if (scp->addrloc == port)
+ return -1;
+ }
+ return 0;
+}
+
+static unsigned short port_alloc(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+static unsigned short port = 0x2000;
+ unsigned short i_port = port;
+
+ while(check_port(++port) != 0) {
+ if (port == i_port)
+ return 0;
+ }
+
+ scp->addrloc = port;
+
+ return 1;
+}
+
+/*
+ * Since this is only ever called from user
+ * level, we don't need a write_lock() version
+ * of this.
+ */
+static int dn_hash_sock(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct hlist_head *list;
+ int rv = -EUSERS;
+
+ BUG_ON(sk_hashed(sk));
+
+ write_lock_bh(&dn_hash_lock);
+
+ if (!scp->addrloc && !port_alloc(sk))
+ goto out;
+
+ rv = -EADDRINUSE;
+ if ((list = dn_find_list(sk)) == NULL)
+ goto out;
+
+ sk_add_node(sk, list);
+ rv = 0;
+out:
+ write_unlock_bh(&dn_hash_lock);
+ return rv;
+}
+
+static void dn_unhash_sock(struct sock *sk)
+{
+ write_lock(&dn_hash_lock);
+ sk_del_node_init(sk);
+ write_unlock(&dn_hash_lock);
+}
+
+static void dn_unhash_sock_bh(struct sock *sk)
+{
+ write_lock_bh(&dn_hash_lock);
+ sk_del_node_init(sk);
+ write_unlock_bh(&dn_hash_lock);
+}
+
+static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
+{
+ int i;
+ unsigned hash = addr->sdn_objnum;
+
+ if (hash == 0) {
+ hash = addr->sdn_objnamel;
+ for(i = 0; i < dn_ntohs(addr->sdn_objnamel); i++) {
+ hash ^= addr->sdn_objname[i];
+ hash ^= (hash << 3);
+ }
+ }
+
+ return &dn_sk_hash[hash & DN_SK_HASH_MASK];
+}
+
+/*
+ * Called to transform a socket from bound (i.e. with a local address)
+ * into a listening socket (doesn't need a local port number) and rehashes
+ * based upon the object name/number.
+ */
+static void dn_rehash_sock(struct sock *sk)
+{
+ struct hlist_head *list;
+ struct dn_scp *scp = DN_SK(sk);
+
+ if (scp->addr.sdn_flags & SDF_WILD)
+ return;
+
+ write_lock_bh(&dn_hash_lock);
+ sk_del_node_init(sk);
+ DN_SK(sk)->addrloc = 0;
+ list = listen_hash(&DN_SK(sk)->addr);
+ sk_add_node(sk, list);
+ write_unlock_bh(&dn_hash_lock);
+}
+
+int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
+{
+ int len = 2;
+
+ *buf++ = type;
+
+ switch(type) {
+ case 0:
+ *buf++ = sdn->sdn_objnum;
+ break;
+ case 1:
+ *buf++ = 0;
+ *buf++ = dn_ntohs(sdn->sdn_objnamel);
+ memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
+ len = 3 + dn_ntohs(sdn->sdn_objnamel);
+ break;
+ case 2:
+ memset(buf, 0, 5);
+ buf += 5;
+ *buf++ = dn_ntohs(sdn->sdn_objnamel);
+ memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
+ len = 7 + dn_ntohs(sdn->sdn_objnamel);
+ break;
+ }
+
+ return len;
+}
+
+/*
+ * On reception of usernames, we handle types 1 and 0 for destination
+ * addresses only. Types 2 and 4 are used for source addresses, but the
+ * UIC, GIC are ignored and they are both treated the same way. Type 3
+ * is never used as I've no idea what its purpose might be or what its
+ * format is.
+ */
+int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
+{
+ unsigned char type;
+ int size = len;
+ int namel = 12;
+
+ sdn->sdn_objnum = 0;
+ sdn->sdn_objnamel = dn_htons(0);
+ memset(sdn->sdn_objname, 0, DN_MAXOBJL);
+
+ if (len < 2)
+ return -1;
+
+ len -= 2;
+ *fmt = *data++;
+ type = *data++;
+
+ switch(*fmt) {
+ case 0:
+ sdn->sdn_objnum = type;
+ return 2;
+ case 1:
+ namel = 16;
+ break;
+ case 2:
+ len -= 4;
+ data += 4;
+ break;
+ case 4:
+ len -= 8;
+ data += 8;
+ break;
+ default:
+ return -1;
+ }
+
+ len -= 1;
+
+ if (len < 0)
+ return -1;
+
+ sdn->sdn_objnamel = dn_htons(*data++);
+ len -= dn_ntohs(sdn->sdn_objnamel);
+
+ if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
+ return -1;
+
+ memcpy(sdn->sdn_objname, data, dn_ntohs(sdn->sdn_objnamel));
+
+ return size - len;
+}
+
+struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
+{
+ struct hlist_head *list = listen_hash(addr);
+ struct hlist_node *node;
+ struct sock *sk;
+
+ read_lock(&dn_hash_lock);
+ sk_for_each(sk, node, list) {
+ struct dn_scp *scp = DN_SK(sk);
+ if (sk->sk_state != TCP_LISTEN)
+ continue;
+ if (scp->addr.sdn_objnum) {
+ if (scp->addr.sdn_objnum != addr->sdn_objnum)
+ continue;
+ } else {
+ if (addr->sdn_objnum)
+ continue;
+ if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
+ continue;
+ if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
+ continue;
+ }
+ sock_hold(sk);
+ read_unlock(&dn_hash_lock);
+ return sk;
+ }
+
+ sk = sk_head(&dn_wild_sk);
+ if (sk) {
+ if (sk->sk_state == TCP_LISTEN)
+ sock_hold(sk);
+ else
+ sk = NULL;
+ }
+
+ read_unlock(&dn_hash_lock);
+ return sk;
+}
+
+struct sock *dn_find_by_skb(struct sk_buff *skb)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct sock *sk;
+ struct hlist_node *node;
+ struct dn_scp *scp;
+
+ read_lock(&dn_hash_lock);
+ sk_for_each(sk, node, &dn_sk_hash[cb->dst_port & DN_SK_HASH_MASK]) {
+ scp = DN_SK(sk);
+ if (cb->src != dn_saddr2dn(&scp->peer))
+ continue;
+ if (cb->dst_port != scp->addrloc)
+ continue;
+ if (scp->addrrem && (cb->src_port != scp->addrrem))
+ continue;
+ sock_hold(sk);
+ goto found;
+ }
+ sk = NULL;
+found:
+ read_unlock(&dn_hash_lock);
+ return sk;
+}
+
+
+
+static void dn_destruct(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ skb_queue_purge(&scp->data_xmit_queue);
+ skb_queue_purge(&scp->other_xmit_queue);
+ skb_queue_purge(&scp->other_receive_queue);
+
+ dst_release(xchg(&sk->sk_dst_cache, NULL));
+}
+
+static struct proto dn_proto = {
+ .name = "DECNET",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct dn_sock),
+};
+
+static struct sock *dn_alloc_sock(struct socket *sock, int gfp)
+{
+ struct dn_scp *scp;
+ struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
+
+ if (!sk)
+ goto out;
+
+ if (sock)
+ sock->ops = &dn_proto_ops;
+ sock_init_data(sock, sk);
+
+ sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
+ sk->sk_destruct = dn_destruct;
+ sk->sk_no_check = 1;
+ sk->sk_family = PF_DECnet;
+ sk->sk_protocol = 0;
+ sk->sk_allocation = gfp;
+
+ /* Initialization of DECnet Session Control Port */
+ scp = DN_SK(sk);
+ scp->state = DN_O; /* Open */
+ scp->numdat = 1; /* Next data seg to tx */
+ scp->numoth = 1; /* Next oth data to tx */
+ scp->ackxmt_dat = 0; /* Last data seg ack'ed */
+ scp->ackxmt_oth = 0; /* Last oth data ack'ed */
+ scp->ackrcv_dat = 0; /* Highest data ack recv*/
+ scp->ackrcv_oth = 0; /* Last oth data ack rec*/
+ scp->flowrem_sw = DN_SEND;
+ scp->flowloc_sw = DN_SEND;
+ scp->flowrem_dat = 0;
+ scp->flowrem_oth = 1;
+ scp->flowloc_dat = 0;
+ scp->flowloc_oth = 1;
+ scp->services_rem = 0;
+ scp->services_loc = 1 | NSP_FC_NONE;
+ scp->info_rem = 0;
+ scp->info_loc = 0x03; /* NSP version 4.1 */
+ scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
+ scp->nonagle = 0;
+ scp->multi_ireq = 1;
+ scp->accept_mode = ACC_IMMED;
+ scp->addr.sdn_family = AF_DECnet;
+ scp->peer.sdn_family = AF_DECnet;
+ scp->accessdata.acc_accl = 5;
+ memcpy(scp->accessdata.acc_acc, "LINUX", 5);
+
+ scp->max_window = NSP_MAX_WINDOW;
+ scp->snd_window = NSP_MIN_WINDOW;
+ scp->nsp_srtt = NSP_INITIAL_SRTT;
+ scp->nsp_rttvar = NSP_INITIAL_RTTVAR;
+ scp->nsp_rxtshift = 0;
+
+ skb_queue_head_init(&scp->data_xmit_queue);
+ skb_queue_head_init(&scp->other_xmit_queue);
+ skb_queue_head_init(&scp->other_receive_queue);
+
+ scp->persist = 0;
+ scp->persist_fxn = NULL;
+ scp->keepalive = 10 * HZ;
+ scp->keepalive_fxn = dn_keepalive;
+
+ init_timer(&scp->delack_timer);
+ scp->delack_pending = 0;
+ scp->delack_fxn = dn_nsp_delayed_ack;
+
+ dn_start_slow_timer(sk);
+out:
+ return sk;
+}
+
+/*
+ * Keepalive timer.
+ * FIXME: Should respond to SO_KEEPALIVE etc.
+ */
+static void dn_keepalive(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ /*
+ * By checking the other_data transmit queue is empty
+ * we are double checking that we are not sending too
+ * many of these keepalive frames.
+ */
+ if (skb_queue_len(&scp->other_xmit_queue) == 0)
+ dn_nsp_send_link(sk, DN_NOCHANGE, 0);
+}
+
+
+/*
+ * Timer for shutdown/destroyed sockets.
+ * When socket is dead & no packets have been sent for a
+ * certain amount of time, they are removed by this
+ * routine. Also takes care of sending out DI & DC
+ * frames at correct times.
+ */
+int dn_destroy_timer(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ scp->persist = dn_nsp_persist(sk);
+
+ switch(scp->state) {
+ case DN_DI:
+ dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
+ if (scp->nsp_rxtshift >= decnet_di_count)
+ scp->state = DN_CN;
+ return 0;
+
+ case DN_DR:
+ dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
+ if (scp->nsp_rxtshift >= decnet_dr_count)
+ scp->state = DN_DRC;
+ return 0;
+
+ case DN_DN:
+ if (scp->nsp_rxtshift < decnet_dn_count) {
+ /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
+ dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
+ return 0;
+ }
+ }
+
+ scp->persist = (HZ * decnet_time_wait);
+
+ if (sk->sk_socket)
+ return 0;
+
+ if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
+ dn_unhash_sock(sk);
+ sock_put(sk);
+ return 1;
+ }
+
+ return 0;
+}
+
+static void dn_destroy_sock(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ scp->nsp_rxtshift = 0; /* reset back off */
+
+ if (sk->sk_socket) {
+ if (sk->sk_socket->state != SS_UNCONNECTED)
+ sk->sk_socket->state = SS_DISCONNECTING;
+ }
+
+ sk->sk_state = TCP_CLOSE;
+
+ switch(scp->state) {
+ case DN_DN:
+ dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
+ sk->sk_allocation);
+ scp->persist_fxn = dn_destroy_timer;
+ scp->persist = dn_nsp_persist(sk);
+ break;
+ case DN_CR:
+ scp->state = DN_DR;
+ goto disc_reject;
+ case DN_RUN:
+ scp->state = DN_DI;
+ case DN_DI:
+ case DN_DR:
+disc_reject:
+ dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
+ case DN_NC:
+ case DN_NR:
+ case DN_RJ:
+ case DN_DIC:
+ case DN_CN:
+ case DN_DRC:
+ case DN_CI:
+ case DN_CD:
+ scp->persist_fxn = dn_destroy_timer;
+ scp->persist = dn_nsp_persist(sk);
+ break;
+ default:
+ printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
+ case DN_O:
+ dn_stop_slow_timer(sk);
+
+ dn_unhash_sock_bh(sk);
+ sock_put(sk);
+
+ break;
+ }
+}
+
+char *dn_addr2asc(dn_address addr, char *buf)
+{
+ unsigned short node, area;
+
+ node = addr & 0x03ff;
+ area = addr >> 10;
+ sprintf(buf, "%hd.%hd", area, node);
+
+ return buf;
+}
+
+
+
+static int dn_create(struct socket *sock, int protocol)
+{
+ struct sock *sk;
+
+ switch(sock->type) {
+ case SOCK_SEQPACKET:
+ if (protocol != DNPROTO_NSP)
+ return -EPROTONOSUPPORT;
+ break;
+ case SOCK_STREAM:
+ break;
+ default:
+ return -ESOCKTNOSUPPORT;
+ }
+
+
+ if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
+ return -ENOBUFS;
+
+ sk->sk_protocol = protocol;
+
+ return 0;
+}
+
+
+static int
+dn_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ if (sk) {
+ sock_orphan(sk);
+ sock_hold(sk);
+ lock_sock(sk);
+ dn_destroy_sock(sk);
+ release_sock(sk);
+ sock_put(sk);
+ }
+
+ return 0;
+}
+
+static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
+ struct net_device *dev;
+ int rv;
+
+ if (addr_len != sizeof(struct sockaddr_dn))
+ return -EINVAL;
+
+ if (saddr->sdn_family != AF_DECnet)
+ return -EINVAL;
+
+ if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
+ return -EINVAL;
+
+ if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
+ return -EINVAL;
+
+ if (saddr->sdn_flags & ~SDF_WILD)
+ return -EINVAL;
+
+#if 1
+ if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
+ (saddr->sdn_flags & SDF_WILD)))
+ return -EACCES;
+#else
+ /*
+ * Maybe put the default actions in the default security ops for
+ * dn_prot_sock ? Would be nice if the capable call would go there
+ * too.
+ */
+ if (security_dn_prot_sock(saddr) &&
+ !capable(CAP_NET_BIND_SERVICE) ||
+ saddr->sdn_objnum || (saddr->sdn_flags & SDF_WILD))
+ return -EACCES;
+#endif
+
+
+ if (!(saddr->sdn_flags & SDF_WILD)) {
+ if (dn_ntohs(saddr->sdn_nodeaddrl)) {
+ read_lock(&dev_base_lock);
+ for(dev = dev_base; dev; dev = dev->next) {
+ if (!dev->dn_ptr)
+ continue;
+ if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
+ break;
+ }
+ read_unlock(&dev_base_lock);
+ if (dev == NULL)
+ return -EADDRNOTAVAIL;
+ }
+ }
+
+ rv = -EINVAL;
+ lock_sock(sk);
+ if (sock_flag(sk, SOCK_ZAPPED)) {
+ memcpy(&scp->addr, saddr, addr_len);
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+ rv = dn_hash_sock(sk);
+ if (rv)
+ sock_set_flag(sk, SOCK_ZAPPED);
+ }
+ release_sock(sk);
+
+ return rv;
+}
+
+
+static int dn_auto_bind(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ int rv;
+
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+ scp->addr.sdn_flags = 0;
+ scp->addr.sdn_objnum = 0;
+
+ /*
+ * This stuff is to keep compatibility with Eduardo's
+ * patch. I hope I can dispense with it shortly...
+ */
+ if ((scp->accessdata.acc_accl != 0) &&
+ (scp->accessdata.acc_accl <= 12)) {
+
+ scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
+ memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
+
+ scp->accessdata.acc_accl = 0;
+ memset(scp->accessdata.acc_acc, 0, 40);
+ }
+ /* End of compatibility stuff */
+
+ scp->addr.sdn_add.a_len = dn_htons(2);
+ rv = dn_dev_bind_default((dn_address *)scp->addr.sdn_add.a_addr);
+ if (rv == 0) {
+ rv = dn_hash_sock(sk);
+ if (rv)
+ sock_set_flag(sk, SOCK_ZAPPED);
+ }
+
+ return rv;
+}
+
+static int dn_confirm_accept(struct sock *sk, long *timeo, int allocation)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ DEFINE_WAIT(wait);
+ int err;
+
+ if (scp->state != DN_CR)
+ return -EINVAL;
+
+ scp->state = DN_CC;
+ scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
+ dn_send_conn_conf(sk, allocation);
+
+ prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+ for(;;) {
+ release_sock(sk);
+ if (scp->state == DN_CC)
+ *timeo = schedule_timeout(*timeo);
+ lock_sock(sk);
+ err = 0;
+ if (scp->state == DN_RUN)
+ break;
+ err = sock_error(sk);
+ if (err)
+ break;
+ err = sock_intr_errno(*timeo);
+ if (signal_pending(current))
+ break;
+ err = -EAGAIN;
+ if (!*timeo)
+ break;
+ prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+ }
+ finish_wait(sk->sk_sleep, &wait);
+ if (err == 0) {
+ sk->sk_socket->state = SS_CONNECTED;
+ } else if (scp->state != DN_CC) {
+ sk->sk_socket->state = SS_UNCONNECTED;
+ }
+ return err;
+}
+
+static int dn_wait_run(struct sock *sk, long *timeo)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ DEFINE_WAIT(wait);
+ int err = 0;
+
+ if (scp->state == DN_RUN)
+ goto out;
+
+ if (!*timeo)
+ return -EALREADY;
+
+ prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+ for(;;) {
+ release_sock(sk);
+ if (scp->state == DN_CI || scp->state == DN_CC)
+ *timeo = schedule_timeout(*timeo);
+ lock_sock(sk);
+ err = 0;
+ if (scp->state == DN_RUN)
+ break;
+ err = sock_error(sk);
+ if (err)
+ break;
+ err = sock_intr_errno(*timeo);
+ if (signal_pending(current))
+ break;
+ err = -ETIMEDOUT;
+ if (!*timeo)
+ break;
+ prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+ }
+ finish_wait(sk->sk_sleep, &wait);
+out:
+ if (err == 0) {
+ sk->sk_socket->state = SS_CONNECTED;
+ } else if (scp->state != DN_CI && scp->state != DN_CC) {
+ sk->sk_socket->state = SS_UNCONNECTED;
+ }
+ return err;
+}
+
+static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
+{
+ struct socket *sock = sk->sk_socket;
+ struct dn_scp *scp = DN_SK(sk);
+ int err = -EISCONN;
+ struct flowi fl;
+
+ if (sock->state == SS_CONNECTED)
+ goto out;
+
+ if (sock->state == SS_CONNECTING) {
+ err = 0;
+ if (scp->state == DN_RUN) {
+ sock->state = SS_CONNECTED;
+ goto out;
+ }
+ err = -ECONNREFUSED;
+ if (scp->state != DN_CI && scp->state != DN_CC) {
+ sock->state = SS_UNCONNECTED;
+ goto out;
+ }
+ return dn_wait_run(sk, timeo);
+ }
+
+ err = -EINVAL;
+ if (scp->state != DN_O)
+ goto out;
+
+ if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
+ goto out;
+ if (addr->sdn_family != AF_DECnet)
+ goto out;
+ if (addr->sdn_flags & SDF_WILD)
+ goto out;
+
+ if (sock_flag(sk, SOCK_ZAPPED)) {
+ err = dn_auto_bind(sk->sk_socket);
+ if (err)
+ goto out;
+ }
+
+ memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
+
+ err = -EHOSTUNREACH;
+ memset(&fl, 0, sizeof(fl));
+ fl.oif = sk->sk_bound_dev_if;
+ fl.fld_dst = dn_saddr2dn(&scp->peer);
+ fl.fld_src = dn_saddr2dn(&scp->addr);
+ dn_sk_ports_copy(&fl, scp);
+ fl.proto = DNPROTO_NSP;
+ if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
+ goto out;
+ sk->sk_route_caps = sk->sk_dst_cache->dev->features;
+ sock->state = SS_CONNECTING;
+ scp->state = DN_CI;
+ scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
+
+ dn_nsp_send_conninit(sk, NSP_CI);
+ err = -EINPROGRESS;
+ if (*timeo) {
+ err = dn_wait_run(sk, timeo);
+ }
+out:
+ return err;
+}
+
+static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
+{
+ struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
+ struct sock *sk = sock->sk;
+ int err;
+ long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
+
+ lock_sock(sk);
+ err = __dn_connect(sk, addr, addrlen, &timeo, 0);
+ release_sock(sk);
+
+ return err;
+}
+
+static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ switch(scp->state) {
+ case DN_RUN:
+ return 0;
+ case DN_CR:
+ return dn_confirm_accept(sk, timeo, sk->sk_allocation);
+ case DN_CI:
+ case DN_CC:
+ return dn_wait_run(sk, timeo);
+ case DN_O:
+ return __dn_connect(sk, addr, addrlen, timeo, flags);
+ }
+
+ return -EINVAL;
+}
+
+
+static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
+{
+ unsigned char *ptr = skb->data;
+
+ acc->acc_userl = *ptr++;
+ memcpy(&acc->acc_user, ptr, acc->acc_userl);
+ ptr += acc->acc_userl;
+
+ acc->acc_passl = *ptr++;
+ memcpy(&acc->acc_pass, ptr, acc->acc_passl);
+ ptr += acc->acc_passl;
+
+ acc->acc_accl = *ptr++;
+ memcpy(&acc->acc_acc, ptr, acc->acc_accl);
+
+ skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
+
+}
+
+static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
+{
+ unsigned char *ptr = skb->data;
+
+ opt->opt_optl = *ptr++;
+ opt->opt_status = 0;
+ memcpy(opt->opt_data, ptr, opt->opt_optl);
+ skb_pull(skb, opt->opt_optl + 1);
+
+}
+
+static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
+{
+ DEFINE_WAIT(wait);
+ struct sk_buff *skb = NULL;
+ int err = 0;
+
+ prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+ for(;;) {
+ release_sock(sk);
+ skb = skb_dequeue(&sk->sk_receive_queue);
+ if (skb == NULL) {
+ *timeo = schedule_timeout(*timeo);
+ skb = skb_dequeue(&sk->sk_receive_queue);
+ }
+ lock_sock(sk);
+ if (skb != NULL)
+ break;
+ err = -EINVAL;
+ if (sk->sk_state != TCP_LISTEN)
+ break;
+ err = sock_intr_errno(*timeo);
+ if (signal_pending(current))
+ break;
+ err = -EAGAIN;
+ if (!*timeo)
+ break;
+ prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+ }
+ finish_wait(sk->sk_sleep, &wait);
+
+ return skb == NULL ? ERR_PTR(err) : skb;
+}
+
+static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+ struct sock *sk = sock->sk, *newsk;
+ struct sk_buff *skb = NULL;
+ struct dn_skb_cb *cb;
+ unsigned char menuver;
+ int err = 0;
+ unsigned char type;
+ long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
+
+ lock_sock(sk);
+
+ if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
+ release_sock(sk);
+ return -EINVAL;
+ }
+
+ skb = skb_dequeue(&sk->sk_receive_queue);
+ if (skb == NULL) {
+ skb = dn_wait_for_connect(sk, &timeo);
+ if (IS_ERR(skb)) {
+ release_sock(sk);
+ return PTR_ERR(skb);
+ }
+ }
+
+ cb = DN_SKB_CB(skb);
+ sk->sk_ack_backlog--;
+ newsk = dn_alloc_sock(newsock, sk->sk_allocation);
+ if (newsk == NULL) {
+ release_sock(sk);
+ kfree_skb(skb);
+ return -ENOBUFS;
+ }
+ release_sock(sk);
+
+ dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
+ skb->dst = NULL;
+
+ DN_SK(newsk)->state = DN_CR;
+ DN_SK(newsk)->addrrem = cb->src_port;
+ DN_SK(newsk)->services_rem = cb->services;
+ DN_SK(newsk)->info_rem = cb->info;
+ DN_SK(newsk)->segsize_rem = cb->segsize;
+ DN_SK(newsk)->accept_mode = DN_SK(sk)->accept_mode;
+
+ if (DN_SK(newsk)->segsize_rem < 230)
+ DN_SK(newsk)->segsize_rem = 230;
+
+ if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
+ DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
+
+ newsk->sk_state = TCP_LISTEN;
+ memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
+
+ /*
+ * If we are listening on a wild socket, we don't want
+ * the newly created socket on the wrong hash queue.
+ */
+ DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
+
+ skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
+ skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
+ *(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
+ *(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
+
+ menuver = *skb->data;
+ skb_pull(skb, 1);
+
+ if (menuver & DN_MENUVER_ACC)
+ dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
+
+ if (menuver & DN_MENUVER_USR)
+ dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
+
+ if (menuver & DN_MENUVER_PRX)
+ DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
+
+ if (menuver & DN_MENUVER_UIC)
+ DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
+
+ kfree_skb(skb);
+
+ memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
+ sizeof(struct optdata_dn));
+ memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
+ sizeof(struct optdata_dn));
+
+ lock_sock(newsk);
+ err = dn_hash_sock(newsk);
+ if (err == 0) {
+ sock_reset_flag(newsk, SOCK_ZAPPED);
+ dn_send_conn_ack(newsk);
+
+ /*
+ * Here we use sk->sk_allocation since although the conn conf is
+ * for the newsk, the context is the old socket.
+ */
+ if (DN_SK(newsk)->accept_mode == ACC_IMMED)
+ err = dn_confirm_accept(newsk, &timeo,
+ sk->sk_allocation);
+ }
+ release_sock(newsk);
+ return err;
+}
+
+
+static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
+{
+ struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+
+ *uaddr_len = sizeof(struct sockaddr_dn);
+
+ lock_sock(sk);
+
+ if (peer) {
+ if ((sock->state != SS_CONNECTED &&
+ sock->state != SS_CONNECTING) &&
+ scp->accept_mode == ACC_IMMED)
+ return -ENOTCONN;
+
+ memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
+ } else {
+ memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
+ }
+
+ release_sock(sk);
+
+ return 0;
+}
+
+
+static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table *wait)
+{
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ int mask = datagram_poll(file, sock, wait);
+
+ if (skb_queue_len(&scp->other_receive_queue))
+ mask |= POLLRDBAND;
+
+ return mask;
+}
+
+static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ int err = -EOPNOTSUPP;
+ long amount = 0;
+ struct sk_buff *skb;
+ int val;
+
+ switch(cmd)
+ {
+ case SIOCGIFADDR:
+ case SIOCSIFADDR:
+ return dn_dev_ioctl(cmd, (void __user *)arg);
+
+ case SIOCATMARK:
+ lock_sock(sk);
+ val = (skb_queue_len(&scp->other_receive_queue) != 0);
+ if (scp->state != DN_RUN)
+ val = -ENOTCONN;
+ release_sock(sk);
+ return val;
+
+ case TIOCOUTQ:
+ amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
+ if (amount < 0)
+ amount = 0;
+ err = put_user(amount, (int __user *)arg);
+ break;
+
+ case TIOCINQ:
+ lock_sock(sk);
+ if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
+ amount = skb->len;
+ } else {
+ struct sk_buff *skb = sk->sk_receive_queue.next;
+ for(;;) {
+ if (skb ==
+ (struct sk_buff *)&sk->sk_receive_queue)
+ break;
+ amount += skb->len;
+ skb = skb->next;
+ }
+ }
+ release_sock(sk);
+ err = put_user(amount, (int __user *)arg);
+ break;
+
+ default:
+ err = dev_ioctl(cmd, (void __user *)arg);
+ break;
+ }
+
+ return err;
+}
+
+static int dn_listen(struct socket *sock, int backlog)
+{
+ struct sock *sk = sock->sk;
+ int err = -EINVAL;
+
+ lock_sock(sk);
+
+ if (sock_flag(sk, SOCK_ZAPPED))
+ goto out;
+
+ if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
+ goto out;
+
+ sk->sk_max_ack_backlog = backlog;
+ sk->sk_ack_backlog = 0;
+ sk->sk_state = TCP_LISTEN;
+ err = 0;
+ dn_rehash_sock(sk);
+
+out:
+ release_sock(sk);
+
+ return err;
+}
+
+
+static int dn_shutdown(struct socket *sock, int how)
+{
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ int err = -ENOTCONN;
+
+ lock_sock(sk);
+
+ if (sock->state == SS_UNCONNECTED)
+ goto out;
+
+ err = 0;
+ if (sock->state == SS_DISCONNECTING)
+ goto out;
+
+ err = -EINVAL;
+ if (scp->state == DN_O)
+ goto out;
+
+ if (how != SHUTDOWN_MASK)
+ goto out;
+
+ sk->sk_shutdown = how;
+ dn_destroy_sock(sk);
+ err = 0;
+
+out:
+ release_sock(sk);
+
+ return err;
+}
+
+static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
+{
+ struct sock *sk = sock->sk;
+ int err;
+
+ lock_sock(sk);
+ err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
+ release_sock(sk);
+
+ return err;
+}
+
+static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
+{
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ long timeo;
+ union {
+ struct optdata_dn opt;
+ struct accessdata_dn acc;
+ int mode;
+ unsigned long win;
+ int val;
+ unsigned char services;
+ unsigned char info;
+ } u;
+ int err;
+
+ if (optlen && !optval)
+ return -EINVAL;
+
+ if (optlen > sizeof(u))
+ return -EINVAL;
+
+ if (copy_from_user(&u, optval, optlen))
+ return -EFAULT;
+
+ switch(optname) {
+ case DSO_CONDATA:
+ if (sock->state == SS_CONNECTED)
+ return -EISCONN;
+ if ((scp->state != DN_O) && (scp->state != DN_CR))
+ return -EINVAL;
+
+ if (optlen != sizeof(struct optdata_dn))
+ return -EINVAL;
+
+ if (u.opt.opt_optl > 16)
+ return -EINVAL;
+
+ memcpy(&scp->conndata_out, &u.opt, optlen);
+ break;
+
+ case DSO_DISDATA:
+ if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
+ return -ENOTCONN;
+
+ if (optlen != sizeof(struct optdata_dn))
+ return -EINVAL;
+
+ if (u.opt.opt_optl > 16)
+ return -EINVAL;
+
+ memcpy(&scp->discdata_out, &u.opt, optlen);
+ break;
+
+ case DSO_CONACCESS:
+ if (sock->state == SS_CONNECTED)
+ return -EISCONN;
+ if (scp->state != DN_O)
+ return -EINVAL;
+
+ if (optlen != sizeof(struct accessdata_dn))
+ return -EINVAL;
+
+ if ((u.acc.acc_accl > DN_MAXACCL) ||
+ (u.acc.acc_passl > DN_MAXACCL) ||
+ (u.acc.acc_userl > DN_MAXACCL))
+ return -EINVAL;
+
+ memcpy(&scp->accessdata, &u.acc, optlen);
+ break;
+
+ case DSO_ACCEPTMODE:
+ if (sock->state == SS_CONNECTED)
+ return -EISCONN;
+ if (scp->state != DN_O)
+ return -EINVAL;
+
+ if (optlen != sizeof(int))
+ return -EINVAL;
+
+ if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
+ return -EINVAL;
+
+ scp->accept_mode = (unsigned char)u.mode;
+ break;
+
+ case DSO_CONACCEPT:
+
+ if (scp->state != DN_CR)
+ return -EINVAL;
+ timeo = sock_rcvtimeo(sk, 0);
+ err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
+ return err;
+
+ case DSO_CONREJECT:
+
+ if (scp->state != DN_CR)
+ return -EINVAL;
+
+ scp->state = DN_DR;
+ sk->sk_shutdown = SHUTDOWN_MASK;
+ dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
+ break;
+
+ default:
+#ifdef CONFIG_NETFILTER
+ return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
+#endif
+ case DSO_LINKINFO:
+ case DSO_STREAM:
+ case DSO_SEQPACKET:
+ return -ENOPROTOOPT;
+
+ case DSO_MAXWINDOW:
+ if (optlen != sizeof(unsigned long))
+ return -EINVAL;
+ if (u.win > NSP_MAX_WINDOW)
+ u.win = NSP_MAX_WINDOW;
+ if (u.win == 0)
+ return -EINVAL;
+ scp->max_window = u.win;
+ if (scp->snd_window > u.win)
+ scp->snd_window = u.win;
+ break;
+
+ case DSO_NODELAY:
+ if (optlen != sizeof(int))
+ return -EINVAL;
+ if (scp->nonagle == 2)
+ return -EINVAL;
+ scp->nonagle = (u.val == 0) ? 0 : 1;
+ /* if (scp->nonagle == 1) { Push pending frames } */
+ break;
+
+ case DSO_CORK:
+ if (optlen != sizeof(int))
+ return -EINVAL;
+ if (scp->nonagle == 1)
+ return -EINVAL;
+ scp->nonagle = (u.val == 0) ? 0 : 2;
+ /* if (scp->nonagle == 0) { Push pending frames } */
+ break;
+
+ case DSO_SERVICES:
+ if (optlen != sizeof(unsigned char))
+ return -EINVAL;
+ if ((u.services & ~NSP_FC_MASK) != 0x01)
+ return -EINVAL;
+ if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
+ return -EINVAL;
+ scp->services_loc = u.services;
+ break;
+
+ case DSO_INFO:
+ if (optlen != sizeof(unsigned char))
+ return -EINVAL;
+ if (u.info & 0xfc)
+ return -EINVAL;
+ scp->info_loc = u.info;
+ break;
+ }
+
+ return 0;
+}
+
+static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
+{
+ struct sock *sk = sock->sk;
+ int err;
+
+ lock_sock(sk);
+ err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
+ release_sock(sk);
+
+ return err;
+}
+
+static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
+{
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ struct linkinfo_dn link;
+ unsigned int r_len;
+ void *r_data = NULL;
+ unsigned int val;
+
+ if(get_user(r_len , optlen))
+ return -EFAULT;
+
+ switch(optname) {
+ case DSO_CONDATA:
+ if (r_len > sizeof(struct optdata_dn))
+ r_len = sizeof(struct optdata_dn);
+ r_data = &scp->conndata_in;
+ break;
+
+ case DSO_DISDATA:
+ if (r_len > sizeof(struct optdata_dn))
+ r_len = sizeof(struct optdata_dn);
+ r_data = &scp->discdata_in;
+ break;
+
+ case DSO_CONACCESS:
+ if (r_len > sizeof(struct accessdata_dn))
+ r_len = sizeof(struct accessdata_dn);
+ r_data = &scp->accessdata;
+ break;
+
+ case DSO_ACCEPTMODE:
+ if (r_len > sizeof(unsigned char))
+ r_len = sizeof(unsigned char);
+ r_data = &scp->accept_mode;
+ break;
+
+ case DSO_LINKINFO:
+ if (r_len > sizeof(struct linkinfo_dn))
+ r_len = sizeof(struct linkinfo_dn);
+
+ switch(sock->state) {
+ case SS_CONNECTING:
+ link.idn_linkstate = LL_CONNECTING;
+ break;
+ case SS_DISCONNECTING:
+ link.idn_linkstate = LL_DISCONNECTING;
+ break;
+ case SS_CONNECTED:
+ link.idn_linkstate = LL_RUNNING;
+ break;
+ default:
+ link.idn_linkstate = LL_INACTIVE;
+ }
+
+ link.idn_segsize = scp->segsize_rem;
+ r_data = &link;
+ break;
+
+ default:
+#ifdef CONFIG_NETFILTER
+ {
+ int val, len;
+
+ if(get_user(len, optlen))
+ return -EFAULT;
+
+ val = nf_getsockopt(sk, PF_DECnet, optname,
+ optval, &len);
+ if (val >= 0)
+ val = put_user(len, optlen);
+ return val;
+ }
+#endif
+ case DSO_STREAM:
+ case DSO_SEQPACKET:
+ case DSO_CONACCEPT:
+ case DSO_CONREJECT:
+ return -ENOPROTOOPT;
+
+ case DSO_MAXWINDOW:
+ if (r_len > sizeof(unsigned long))
+ r_len = sizeof(unsigned long);
+ r_data = &scp->max_window;
+ break;
+
+ case DSO_NODELAY:
+ if (r_len > sizeof(int))
+ r_len = sizeof(int);
+ val = (scp->nonagle == 1);
+ r_data = &val;
+ break;
+
+ case DSO_CORK:
+ if (r_len > sizeof(int))
+ r_len = sizeof(int);
+ val = (scp->nonagle == 2);
+ r_data = &val;
+ break;
+
+ case DSO_SERVICES:
+ if (r_len > sizeof(unsigned char))
+ r_len = sizeof(unsigned char);
+ r_data = &scp->services_rem;
+ break;
+
+ case DSO_INFO:
+ if (r_len > sizeof(unsigned char))
+ r_len = sizeof(unsigned char);
+ r_data = &scp->info_rem;
+ break;
+ }
+
+ if (r_data) {
+ if (copy_to_user(optval, r_data, r_len))
+ return -EFAULT;
+ if (put_user(r_len, optlen))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+
+static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
+{
+ struct sk_buff *skb = q->next;
+ int len = 0;
+
+ if (flags & MSG_OOB)
+ return skb_queue_len(q) ? 1 : 0;
+
+ while(skb != (struct sk_buff *)q) {
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ len += skb->len;
+
+ if (cb->nsp_flags & 0x40) {
+ /* SOCK_SEQPACKET reads to EOM */
+ if (sk->sk_type == SOCK_SEQPACKET)
+ return 1;
+ /* so does SOCK_STREAM unless WAITALL is specified */
+ if (!(flags & MSG_WAITALL))
+ return 1;
+ }
+
+ /* minimum data length for read exceeded */
+ if (len >= target)
+ return 1;
+
+ skb = skb->next;
+ }
+
+ return 0;
+}
+
+
+static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t size, int flags)
+{
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ struct sk_buff_head *queue = &sk->sk_receive_queue;
+ size_t target = size > 1 ? 1 : 0;
+ size_t copied = 0;
+ int rv = 0;
+ struct sk_buff *skb, *nskb;
+ struct dn_skb_cb *cb = NULL;
+ unsigned char eor = 0;
+ long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
+
+ lock_sock(sk);
+
+ if (sock_flag(sk, SOCK_ZAPPED)) {
+ rv = -EADDRNOTAVAIL;
+ goto out;
+ }
+
+ rv = dn_check_state(sk, NULL, 0, &timeo, flags);
+ if (rv)
+ goto out;
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN) {
+ if (!(flags & MSG_NOSIGNAL))
+ send_sig(SIGPIPE, current, 0);
+ rv = -EPIPE;
+ goto out;
+ }
+
+ if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
+ rv = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (flags & MSG_OOB)
+ queue = &scp->other_receive_queue;
+
+ if (flags & MSG_WAITALL)
+ target = size;
+
+
+ /*
+ * See if there is data ready to read, sleep if there isn't
+ */
+ for(;;) {
+ if (sk->sk_err)
+ goto out;
+
+ if (skb_queue_len(&scp->other_receive_queue)) {
+ if (!(flags & MSG_OOB)) {
+ msg->msg_flags |= MSG_OOB;
+ if (!scp->other_report) {
+ scp->other_report = 1;
+ goto out;
+ }
+ }
+ }
+
+ if (scp->state != DN_RUN)
+ goto out;
+
+ if (signal_pending(current)) {
+ rv = sock_intr_errno(timeo);
+ goto out;
+ }
+
+ if (dn_data_ready(sk, queue, flags, target))
+ break;
+
+ if (flags & MSG_DONTWAIT) {
+ rv = -EWOULDBLOCK;
+ goto out;
+ }
+
+ set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
+ SOCK_SLEEP_PRE(sk)
+
+ if (!dn_data_ready(sk, queue, flags, target))
+ schedule();
+
+ SOCK_SLEEP_POST(sk)
+ clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
+ }
+
+ for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
+ unsigned int chunk = skb->len;
+ cb = DN_SKB_CB(skb);
+
+ if ((chunk + copied) > size)
+ chunk = size - copied;
+
+ if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
+ rv = -EFAULT;
+ break;
+ }
+ copied += chunk;
+
+ if (!(flags & MSG_PEEK))
+ skb_pull(skb, chunk);
+
+ eor = cb->nsp_flags & 0x40;
+ nskb = skb->next;
+
+ if (skb->len == 0) {
+ skb_unlink(skb);
+ kfree_skb(skb);
+ /*
+ * N.B. Don't refer to skb or cb after this point
+ * in loop.
+ */
+ if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
+ scp->flowloc_sw = DN_SEND;
+ dn_nsp_send_link(sk, DN_SEND, 0);
+ }
+ }
+
+ if (eor) {
+ if (sk->sk_type == SOCK_SEQPACKET)
+ break;
+ if (!(flags & MSG_WAITALL))
+ break;
+ }
+
+ if (flags & MSG_OOB)
+ break;
+
+ if (copied >= target)
+ break;
+ }
+
+ rv = copied;
+
+
+ if (eor && (sk->sk_type == SOCK_SEQPACKET))
+ msg->msg_flags |= MSG_EOR;
+
+out:
+ if (rv == 0)
+ rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
+
+ if ((rv >= 0) && msg->msg_name) {
+ memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
+ msg->msg_namelen = sizeof(struct sockaddr_dn);
+ }
+
+ release_sock(sk);
+
+ return rv;
+}
+
+
+static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
+{
+ unsigned char fctype = scp->services_rem & NSP_FC_MASK;
+ if (skb_queue_len(queue) >= scp->snd_window)
+ return 1;
+ if (fctype != NSP_FC_NONE) {
+ if (flags & MSG_OOB) {
+ if (scp->flowrem_oth == 0)
+ return 1;
+ } else {
+ if (scp->flowrem_dat == 0)
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * The DECnet spec requires the the "routing layer" accepts packets which
+ * are at least 230 bytes in size. This excludes any headers which the NSP
+ * layer might add, so we always assume that we'll be using the maximal
+ * length header on data packets. The variation in length is due to the
+ * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
+ * make much practical difference.
+ */
+unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
+{
+ unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
+ if (dev) {
+ struct dn_dev *dn_db = dev->dn_ptr;
+ mtu -= LL_RESERVED_SPACE(dev);
+ if (dn_db->use_long)
+ mtu -= 21;
+ else
+ mtu -= 6;
+ mtu -= DN_MAX_NSP_DATA_HEADER;
+ } else {
+ /*
+ * 21 = long header, 16 = guess at MAC header length
+ */
+ mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
+ }
+ if (mtu > mss)
+ mss = mtu;
+ return mss;
+}
+
+static inline unsigned int dn_current_mss(struct sock *sk, int flags)
+{
+ struct dst_entry *dst = __sk_dst_get(sk);
+ struct dn_scp *scp = DN_SK(sk);
+ int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
+
+ /* Other data messages are limited to 16 bytes per packet */
+ if (flags & MSG_OOB)
+ return 16;
+
+ /* This works out the maximum size of segment we can send out */
+ if (dst) {
+ u32 mtu = dst_mtu(dst);
+ mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
+ }
+
+ return mss_now;
+}
+
+static int dn_error(struct sock *sk, int flags, int err)
+{
+ if (err == -EPIPE)
+ err = sock_error(sk) ? : -EPIPE;
+ if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
+ send_sig(SIGPIPE, current, 0);
+ return err;
+}
+
+static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t size)
+{
+ struct sock *sk = sock->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ size_t mss;
+ struct sk_buff_head *queue = &scp->data_xmit_queue;
+ int flags = msg->msg_flags;
+ int err = 0;
+ size_t sent = 0;
+ int addr_len = msg->msg_namelen;
+ struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
+ struct sk_buff *skb = NULL;
+ struct dn_skb_cb *cb;
+ size_t len;
+ unsigned char fctype;
+ long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
+
+ if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
+ return -EOPNOTSUPP;
+
+ if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
+ return -EINVAL;
+
+ /*
+ * The only difference between stream sockets and sequenced packet
+ * sockets is that the stream sockets always behave as if MSG_EOR
+ * has been set.
+ */
+ if (sock->type == SOCK_STREAM) {
+ if (flags & MSG_EOR)
+ return -EINVAL;
+ flags |= MSG_EOR;
+ }
+
+ lock_sock(sk);
+
+ err = dn_check_state(sk, addr, addr_len, &timeo, flags);
+ if (err)
+ goto out_err;
+
+ if (sk->sk_shutdown & SEND_SHUTDOWN) {
+ err = -EPIPE;
+ goto out_err;
+ }
+
+ if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
+ dst_negative_advice(&sk->sk_dst_cache);
+
+ mss = scp->segsize_rem;
+ fctype = scp->services_rem & NSP_FC_MASK;
+
+ mss = dn_current_mss(sk, flags);
+
+ if (flags & MSG_OOB) {
+ queue = &scp->other_xmit_queue;
+ if (size > mss) {
+ err = -EMSGSIZE;
+ goto out;
+ }
+ }
+
+ scp->persist_fxn = dn_nsp_xmit_timeout;
+
+ while(sent < size) {
+ err = sock_error(sk);
+ if (err)
+ goto out;
+
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeo);
+ goto out;
+ }
+
+ /*
+ * Calculate size that we wish to send.
+ */
+ len = size - sent;
+
+ if (len > mss)
+ len = mss;
+
+ /*
+ * Wait for queue size to go down below the window
+ * size.
+ */
+ if (dn_queue_too_long(scp, queue, flags)) {
+ if (flags & MSG_DONTWAIT) {
+ err = -EWOULDBLOCK;
+ goto out;
+ }
+
+ SOCK_SLEEP_PRE(sk)
+
+ if (dn_queue_too_long(scp, queue, flags))
+ schedule();
+
+ SOCK_SLEEP_POST(sk)
+
+ continue;
+ }
+
+ /*
+ * Get a suitably sized skb.
+ */
+ skb = dn_alloc_send_skb(sk, &len, flags & MSG_DONTWAIT, timeo, &err);
+
+ if (err)
+ break;
+
+ if (!skb)
+ continue;
+
+ cb = DN_SKB_CB(skb);
+
+ skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
+
+ if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
+ err = -EFAULT;
+ goto out;
+ }
+
+ if (flags & MSG_OOB) {
+ cb->nsp_flags = 0x30;
+ if (fctype != NSP_FC_NONE)
+ scp->flowrem_oth--;
+ } else {
+ cb->nsp_flags = 0x00;
+ if (scp->seg_total == 0)
+ cb->nsp_flags |= 0x20;
+
+ scp->seg_total += len;
+
+ if (((sent + len) == size) && (flags & MSG_EOR)) {
+ cb->nsp_flags |= 0x40;
+ scp->seg_total = 0;
+ if (fctype == NSP_FC_SCMC)
+ scp->flowrem_dat--;
+ }
+ if (fctype == NSP_FC_SRC)
+ scp->flowrem_dat--;
+ }
+
+ sent += len;
+ dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
+ skb = NULL;
+
+ scp->persist = dn_nsp_persist(sk);
+
+ }
+out:
+
+ if (skb)
+ kfree_skb(skb);
+
+ release_sock(sk);
+
+ return sent ? sent : err;
+
+out_err:
+ err = dn_error(sk, flags, err);
+ release_sock(sk);
+ return err;
+}
+
+static int dn_device_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = (struct net_device *)ptr;
+
+ switch(event) {
+ case NETDEV_UP:
+ dn_dev_up(dev);
+ break;
+ case NETDEV_DOWN:
+ dn_dev_down(dev);
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block dn_dev_notifier = {
+ .notifier_call = dn_device_event,
+};
+
+extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *);
+
+static struct packet_type dn_dix_packet_type = {
+ .type = __constant_htons(ETH_P_DNA_RT),
+ .dev = NULL, /* All devices */
+ .func = dn_route_rcv,
+};
+
+#ifdef CONFIG_PROC_FS
+struct dn_iter_state {
+ int bucket;
+};
+
+static struct sock *dn_socket_get_first(struct seq_file *seq)
+{
+ struct dn_iter_state *state = seq->private;
+ struct sock *n = NULL;
+
+ for(state->bucket = 0;
+ state->bucket < DN_SK_HASH_SIZE;
+ ++state->bucket) {
+ n = sk_head(&dn_sk_hash[state->bucket]);
+ if (n)
+ break;
+ }
+
+ return n;
+}
+
+static struct sock *dn_socket_get_next(struct seq_file *seq,
+ struct sock *n)
+{
+ struct dn_iter_state *state = seq->private;
+
+ n = sk_next(n);
+try_again:
+ if (n)
+ goto out;
+ if (++state->bucket >= DN_SK_HASH_SIZE)
+ goto out;
+ n = sk_head(&dn_sk_hash[state->bucket]);
+ goto try_again;
+out:
+ return n;
+}
+
+static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
+{
+ struct sock *sk = dn_socket_get_first(seq);
+
+ if (sk) {
+ while(*pos && (sk = dn_socket_get_next(seq, sk)))
+ --*pos;
+ }
+ return *pos ? NULL : sk;
+}
+
+static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
+{
+ void *rc;
+ read_lock_bh(&dn_hash_lock);
+ rc = socket_get_idx(seq, &pos);
+ if (!rc) {
+ read_unlock_bh(&dn_hash_lock);
+ }
+ return rc;
+}
+
+static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ void *rc;
+
+ if (v == SEQ_START_TOKEN) {
+ rc = dn_socket_get_idx(seq, 0);
+ goto out;
+ }
+
+ rc = dn_socket_get_next(seq, v);
+ if (rc)
+ goto out;
+ read_unlock_bh(&dn_hash_lock);
+out:
+ ++*pos;
+ return rc;
+}
+
+static void dn_socket_seq_stop(struct seq_file *seq, void *v)
+{
+ if (v && v != SEQ_START_TOKEN)
+ read_unlock_bh(&dn_hash_lock);
+}
+
+#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
+
+static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
+{
+ int i;
+
+ switch (dn_ntohs(dn->sdn_objnamel)) {
+ case 0:
+ sprintf(buf, "%d", dn->sdn_objnum);
+ break;
+ default:
+ for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
+ buf[i] = dn->sdn_objname[i];
+ if (IS_NOT_PRINTABLE(buf[i]))
+ buf[i] = '.';
+ }
+ buf[i] = 0;
+ }
+}
+
+static char *dn_state2asc(unsigned char state)
+{
+ switch(state) {
+ case DN_O:
+ return "OPEN";
+ case DN_CR:
+ return " CR";
+ case DN_DR:
+ return " DR";
+ case DN_DRC:
+ return " DRC";
+ case DN_CC:
+ return " CC";
+ case DN_CI:
+ return " CI";
+ case DN_NR:
+ return " NR";
+ case DN_NC:
+ return " NC";
+ case DN_CD:
+ return " CD";
+ case DN_RJ:
+ return " RJ";
+ case DN_RUN:
+ return " RUN";
+ case DN_DI:
+ return " DI";
+ case DN_DIC:
+ return " DIC";
+ case DN_DN:
+ return " DN";
+ case DN_CL:
+ return " CL";
+ case DN_CN:
+ return " CN";
+ }
+
+ return "????";
+}
+
+static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ char buf1[DN_ASCBUF_LEN];
+ char buf2[DN_ASCBUF_LEN];
+ char local_object[DN_MAXOBJL+3];
+ char remote_object[DN_MAXOBJL+3];
+
+ dn_printable_object(&scp->addr, local_object);
+ dn_printable_object(&scp->peer, remote_object);
+
+ seq_printf(seq,
+ "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
+ "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
+ dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
+ scp->addrloc,
+ scp->numdat,
+ scp->numoth,
+ scp->ackxmt_dat,
+ scp->ackxmt_oth,
+ scp->flowloc_sw,
+ local_object,
+ dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
+ scp->addrrem,
+ scp->numdat_rcv,
+ scp->numoth_rcv,
+ scp->ackrcv_dat,
+ scp->ackrcv_oth,
+ scp->flowrem_sw,
+ remote_object,
+ dn_state2asc(scp->state),
+ ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
+}
+
+static int dn_socket_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq, "Local Remote\n");
+ } else {
+ dn_socket_format_entry(seq, v);
+ }
+ return 0;
+}
+
+static struct seq_operations dn_socket_seq_ops = {
+ .start = dn_socket_seq_start,
+ .next = dn_socket_seq_next,
+ .stop = dn_socket_seq_stop,
+ .show = dn_socket_seq_show,
+};
+
+static int dn_socket_seq_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq;
+ int rc = -ENOMEM;
+ struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+ if (!s)
+ goto out;
+
+ rc = seq_open(file, &dn_socket_seq_ops);
+ if (rc)
+ goto out_kfree;
+
+ seq = file->private_data;
+ seq->private = s;
+ memset(s, 0, sizeof(*s));
+out:
+ return rc;
+out_kfree:
+ kfree(s);
+ goto out;
+}
+
+static struct file_operations dn_socket_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = dn_socket_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+#endif
+
+static struct net_proto_family dn_family_ops = {
+ .family = AF_DECnet,
+ .create = dn_create,
+ .owner = THIS_MODULE,
+};
+
+static struct proto_ops dn_proto_ops = {
+ .family = AF_DECnet,
+ .owner = THIS_MODULE,
+ .release = dn_release,
+ .bind = dn_bind,
+ .connect = dn_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = dn_accept,
+ .getname = dn_getname,
+ .poll = dn_poll,
+ .ioctl = dn_ioctl,
+ .listen = dn_listen,
+ .shutdown = dn_shutdown,
+ .setsockopt = dn_setsockopt,
+ .getsockopt = dn_getsockopt,
+ .sendmsg = dn_sendmsg,
+ .recvmsg = dn_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+};
+
+void dn_register_sysctl(void);
+void dn_unregister_sysctl(void);
+
+MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
+MODULE_AUTHOR("Linux DECnet Project Team");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_DECnet);
+
+static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
+
+static int __init decnet_init(void)
+{
+ int rc;
+
+ printk(banner);
+
+ rc = proto_register(&dn_proto, 1);
+ if (rc != 0)
+ goto out;
+
+ dn_neigh_init();
+ dn_dev_init();
+ dn_route_init();
+ dn_fib_init();
+
+ sock_register(&dn_family_ops);
+ dev_add_pack(&dn_dix_packet_type);
+ register_netdevice_notifier(&dn_dev_notifier);
+
+ proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
+ dn_register_sysctl();
+out:
+ return rc;
+
+}
+module_init(decnet_init);
+
+/*
+ * Prevent DECnet module unloading until its fixed properly.
+ * Requires an audit of the code to check for memory leaks and
+ * initialisation problems etc.
+ */
+#if 0
+static void __exit decnet_exit(void)
+{
+ sock_unregister(AF_DECnet);
+ dev_remove_pack(&dn_dix_packet_type);
+
+ dn_unregister_sysctl();
+
+ unregister_netdevice_notifier(&dn_dev_notifier);
+
+ dn_route_cleanup();
+ dn_dev_cleanup();
+ dn_neigh_cleanup();
+ dn_fib_cleanup();
+
+ proc_net_remove("decnet");
+
+ proto_unregister(&dn_proto);
+}
+module_exit(decnet_exit);
+#endif
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
new file mode 100644
index 0000000..c2a0346
--- /dev/null
+++ b/net/decnet/dn_dev.c
@@ -0,0 +1,1481 @@
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Device Layer
+ *
+ * Authors: Steve Whitehouse <SteveW@ACM.org>
+ * Eduardo Marcelo Serrat <emserrat@geocities.com>
+ *
+ * Changes:
+ * Steve Whitehouse : Devices now see incoming frames so they
+ * can mark on who it came from.
+ * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
+ * can now have a device specific setup func.
+ * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
+ * Steve Whitehouse : Fixed bug which sometimes killed timer
+ * Steve Whitehouse : Multiple ifaddr support
+ * Steve Whitehouse : SIOCGIFCONF is now a compile time option
+ * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
+ * Steve Whitehouse : Removed timer1 - it's a user space issue now
+ * Patrick Caulfield : Fixed router hello message format
+ * Steve Whitehouse : Got rid of constant sizes for blksize for
+ * devices. All mtu based now.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/sysctl.h>
+#include <linux/notifier.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_dev.h>
+#include <net/dn_route.h>
+#include <net/dn_neigh.h>
+#include <net/dn_fib.h>
+
+#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
+
+static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
+static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
+static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
+static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
+
+extern struct neigh_table dn_neigh_table;
+
+/*
+ * decnet_address is kept in network order.
+ */
+dn_address decnet_address = 0;
+
+static DEFINE_RWLOCK(dndev_lock);
+static struct net_device *decnet_default_device;
+static struct notifier_block *dnaddr_chain;
+
+static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
+static void dn_dev_delete(struct net_device *dev);
+static void rtmsg_ifa(int event, struct dn_ifaddr *ifa);
+
+static int dn_eth_up(struct net_device *);
+static void dn_eth_down(struct net_device *);
+static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
+static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
+
+static struct dn_dev_parms dn_dev_list[] = {
+{
+ .type = ARPHRD_ETHER, /* Ethernet */
+ .mode = DN_DEV_BCAST,
+ .state = DN_DEV_S_RU,
+ .t2 = 1,
+ .t3 = 10,
+ .name = "ethernet",
+ .ctl_name = NET_DECNET_CONF_ETHER,
+ .up = dn_eth_up,
+ .down = dn_eth_down,
+ .timer3 = dn_send_brd_hello,
+},
+{
+ .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
+ .mode = DN_DEV_BCAST,
+ .state = DN_DEV_S_RU,
+ .t2 = 1,
+ .t3 = 10,
+ .name = "ipgre",
+ .ctl_name = NET_DECNET_CONF_GRE,
+ .timer3 = dn_send_brd_hello,
+},
+#if 0
+{
+ .type = ARPHRD_X25, /* Bog standard X.25 */
+ .mode = DN_DEV_UCAST,
+ .state = DN_DEV_S_DS,
+ .t2 = 1,
+ .t3 = 120,
+ .name = "x25",
+ .ctl_name = NET_DECNET_CONF_X25,
+ .timer3 = dn_send_ptp_hello,
+},
+#endif
+#if 0
+{
+ .type = ARPHRD_PPP, /* DECnet over PPP */
+ .mode = DN_DEV_BCAST,
+ .state = DN_DEV_S_RU,
+ .t2 = 1,
+ .t3 = 10,
+ .name = "ppp",
+ .ctl_name = NET_DECNET_CONF_PPP,
+ .timer3 = dn_send_brd_hello,
+},
+#endif
+{
+ .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
+ .mode = DN_DEV_UCAST,
+ .state = DN_DEV_S_DS,
+ .t2 = 1,
+ .t3 = 120,
+ .name = "ddcmp",
+ .ctl_name = NET_DECNET_CONF_DDCMP,
+ .timer3 = dn_send_ptp_hello,
+},
+{
+ .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
+ .mode = DN_DEV_BCAST,
+ .state = DN_DEV_S_RU,
+ .t2 = 1,
+ .t3 = 10,
+ .name = "loopback",
+ .ctl_name = NET_DECNET_CONF_LOOPBACK,
+ .timer3 = dn_send_brd_hello,
+}
+};
+
+#define DN_DEV_LIST_SIZE (sizeof(dn_dev_list)/sizeof(struct dn_dev_parms))
+
+#define DN_DEV_PARMS_OFFSET(x) ((int) ((char *) &((struct dn_dev_parms *)0)->x))
+
+#ifdef CONFIG_SYSCTL
+
+static int min_t2[] = { 1 };
+static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
+static int min_t3[] = { 1 };
+static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
+
+static int min_priority[1];
+static int max_priority[] = { 127 }; /* From DECnet spec */
+
+static int dn_forwarding_proc(ctl_table *, int, struct file *,
+ void __user *, size_t *, loff_t *);
+static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
+ void __user *oldval, size_t __user *oldlenp,
+ void __user *newval, size_t newlen,
+ void **context);
+
+static struct dn_dev_sysctl_table {
+ struct ctl_table_header *sysctl_header;
+ ctl_table dn_dev_vars[5];
+ ctl_table dn_dev_dev[2];
+ ctl_table dn_dev_conf_dir[2];
+ ctl_table dn_dev_proto_dir[2];
+ ctl_table dn_dev_root_dir[2];
+} dn_dev_sysctl = {
+ NULL,
+ {
+ {
+ .ctl_name = NET_DECNET_CONF_DEV_FORWARDING,
+ .procname = "forwarding",
+ .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = dn_forwarding_proc,
+ .strategy = dn_forwarding_sysctl,
+ },
+ {
+ .ctl_name = NET_DECNET_CONF_DEV_PRIORITY,
+ .procname = "priority",
+ .data = (void *)DN_DEV_PARMS_OFFSET(priority),
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .strategy = sysctl_intvec,
+ .extra1 = &min_priority,
+ .extra2 = &max_priority
+ },
+ {
+ .ctl_name = NET_DECNET_CONF_DEV_T2,
+ .procname = "t2",
+ .data = (void *)DN_DEV_PARMS_OFFSET(t2),
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .strategy = sysctl_intvec,
+ .extra1 = &min_t2,
+ .extra2 = &max_t2
+ },
+ {
+ .ctl_name = NET_DECNET_CONF_DEV_T3,
+ .procname = "t3",
+ .data = (void *)DN_DEV_PARMS_OFFSET(t3),
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .strategy = sysctl_intvec,
+ .extra1 = &min_t3,
+ .extra2 = &max_t3
+ },
+ {0}
+ },
+ {{
+ .ctl_name = 0,
+ .procname = "",
+ .mode = 0555,
+ .child = dn_dev_sysctl.dn_dev_vars
+ }, {0}},
+ {{
+ .ctl_name = NET_DECNET_CONF,
+ .procname = "conf",
+ .mode = 0555,
+ .child = dn_dev_sysctl.dn_dev_dev
+ }, {0}},
+ {{
+ .ctl_name = NET_DECNET,
+ .procname = "decnet",
+ .mode = 0555,
+ .child = dn_dev_sysctl.dn_dev_conf_dir
+ }, {0}},
+ {{
+ .ctl_name = CTL_NET,
+ .procname = "net",
+ .mode = 0555,
+ .child = dn_dev_sysctl.dn_dev_proto_dir
+ }, {0}}
+};
+
+static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
+{
+ struct dn_dev_sysctl_table *t;
+ int i;
+
+ t = kmalloc(sizeof(*t), GFP_KERNEL);
+ if (t == NULL)
+ return;
+
+ memcpy(t, &dn_dev_sysctl, sizeof(*t));
+
+ for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
+ long offset = (long)t->dn_dev_vars[i].data;
+ t->dn_dev_vars[i].data = ((char *)parms) + offset;
+ t->dn_dev_vars[i].de = NULL;
+ }
+
+ if (dev) {
+ t->dn_dev_dev[0].procname = dev->name;
+ t->dn_dev_dev[0].ctl_name = dev->ifindex;
+ } else {
+ t->dn_dev_dev[0].procname = parms->name;
+ t->dn_dev_dev[0].ctl_name = parms->ctl_name;
+ }
+
+ t->dn_dev_dev[0].child = t->dn_dev_vars;
+ t->dn_dev_dev[0].de = NULL;
+ t->dn_dev_conf_dir[0].child = t->dn_dev_dev;
+ t->dn_dev_conf_dir[0].de = NULL;
+ t->dn_dev_proto_dir[0].child = t->dn_dev_conf_dir;
+ t->dn_dev_proto_dir[0].de = NULL;
+ t->dn_dev_root_dir[0].child = t->dn_dev_proto_dir;
+ t->dn_dev_root_dir[0].de = NULL;
+ t->dn_dev_vars[0].extra1 = (void *)dev;
+
+ t->sysctl_header = register_sysctl_table(t->dn_dev_root_dir, 0);
+ if (t->sysctl_header == NULL)
+ kfree(t);
+ else
+ parms->sysctl = t;
+}
+
+static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
+{
+ if (parms->sysctl) {
+ struct dn_dev_sysctl_table *t = parms->sysctl;
+ parms->sysctl = NULL;
+ unregister_sysctl_table(t->sysctl_header);
+ kfree(t);
+ }
+}
+
+static int dn_forwarding_proc(ctl_table *table, int write,
+ struct file *filep,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+#ifdef CONFIG_DECNET_ROUTER
+ struct net_device *dev = table->extra1;
+ struct dn_dev *dn_db;
+ int err;
+ int tmp, old;
+
+ if (table->extra1 == NULL)
+ return -EINVAL;
+
+ dn_db = dev->dn_ptr;
+ old = dn_db->parms.forwarding;
+
+ err = proc_dointvec(table, write, filep, buffer, lenp, ppos);
+
+ if ((err >= 0) && write) {
+ if (dn_db->parms.forwarding < 0)
+ dn_db->parms.forwarding = 0;
+ if (dn_db->parms.forwarding > 2)
+ dn_db->parms.forwarding = 2;
+ /*
+ * What an ugly hack this is... its works, just. It
+ * would be nice if sysctl/proc were just that little
+ * bit more flexible so I don't have to write a special
+ * routine, or suffer hacks like this - SJW
+ */
+ tmp = dn_db->parms.forwarding;
+ dn_db->parms.forwarding = old;
+ if (dn_db->parms.down)
+ dn_db->parms.down(dev);
+ dn_db->parms.forwarding = tmp;
+ if (dn_db->parms.up)
+ dn_db->parms.up(dev);
+ }
+
+ return err;
+#else
+ return -EINVAL;
+#endif
+}
+
+static int dn_forwarding_sysctl(ctl_table *table, int __user *name, int nlen,
+ void __user *oldval, size_t __user *oldlenp,
+ void __user *newval, size_t newlen,
+ void **context)
+{
+#ifdef CONFIG_DECNET_ROUTER
+ struct net_device *dev = table->extra1;
+ struct dn_dev *dn_db;
+ int value;
+
+ if (table->extra1 == NULL)
+ return -EINVAL;
+
+ dn_db = dev->dn_ptr;
+
+ if (newval && newlen) {
+ if (newlen != sizeof(int))
+ return -EINVAL;
+
+ if (get_user(value, (int __user *)newval))
+ return -EFAULT;
+ if (value < 0)
+ return -EINVAL;
+ if (value > 2)
+ return -EINVAL;
+
+ if (dn_db->parms.down)
+ dn_db->parms.down(dev);
+ dn_db->parms.forwarding = value;
+ if (dn_db->parms.up)
+ dn_db->parms.up(dev);
+ }
+
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
+#else /* CONFIG_SYSCTL */
+static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
+{
+}
+static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
+{
+}
+
+#endif /* CONFIG_SYSCTL */
+
+static inline __u16 mtu2blksize(struct net_device *dev)
+{
+ u32 blksize = dev->mtu;
+ if (blksize > 0xffff)
+ blksize = 0xffff;
+
+ if (dev->type == ARPHRD_ETHER ||
+ dev->type == ARPHRD_PPP ||
+ dev->type == ARPHRD_IPGRE ||
+ dev->type == ARPHRD_LOOPBACK)
+ blksize -= 2;
+
+ return (__u16)blksize;
+}
+
+static struct dn_ifaddr *dn_dev_alloc_ifa(void)
+{
+ struct dn_ifaddr *ifa;
+
+ ifa = kmalloc(sizeof(*ifa), GFP_KERNEL);
+
+ if (ifa) {
+ memset(ifa, 0, sizeof(*ifa));
+ }
+
+ return ifa;
+}
+
+static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
+{
+ kfree(ifa);
+}
+
+static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
+{
+ struct dn_ifaddr *ifa1 = *ifap;
+ unsigned char mac_addr[6];
+ struct net_device *dev = dn_db->dev;
+
+ ASSERT_RTNL();
+
+ *ifap = ifa1->ifa_next;
+
+ if (dn_db->dev->type == ARPHRD_ETHER) {
+ if (ifa1->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
+ dn_dn2eth(mac_addr, ifa1->ifa_local);
+ dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
+ }
+ }
+
+ rtmsg_ifa(RTM_DELADDR, ifa1);
+ notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
+ if (destroy) {
+ dn_dev_free_ifa(ifa1);
+
+ if (dn_db->ifa_list == NULL)
+ dn_dev_delete(dn_db->dev);
+ }
+}
+
+static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
+{
+ struct net_device *dev = dn_db->dev;
+ struct dn_ifaddr *ifa1;
+ unsigned char mac_addr[6];
+
+ ASSERT_RTNL();
+
+ /* Check for duplicates */
+ for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
+ if (ifa1->ifa_local == ifa->ifa_local)
+ return -EEXIST;
+ }
+
+ if (dev->type == ARPHRD_ETHER) {
+ if (ifa->ifa_local != dn_htons(dn_eth2dn(dev->dev_addr))) {
+ dn_dn2eth(mac_addr, ifa->ifa_local);
+ dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
+ dev_mc_upload(dev);
+ }
+ }
+
+ ifa->ifa_next = dn_db->ifa_list;
+ dn_db->ifa_list = ifa;
+
+ rtmsg_ifa(RTM_NEWADDR, ifa);
+ notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
+
+ return 0;
+}
+
+static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
+{
+ struct dn_dev *dn_db = dev->dn_ptr;
+ int rv;
+
+ if (dn_db == NULL) {
+ int err;
+ dn_db = dn_dev_create(dev, &err);
+ if (dn_db == NULL)
+ return err;
+ }
+
+ ifa->ifa_dev = dn_db;
+
+ if (dev->flags & IFF_LOOPBACK)
+ ifa->ifa_scope = RT_SCOPE_HOST;
+
+ rv = dn_dev_insert_ifa(dn_db, ifa);
+ if (rv)
+ dn_dev_free_ifa(ifa);
+ return rv;
+}
+
+
+int dn_dev_ioctl(unsigned int cmd, void __user *arg)
+{
+ char buffer[DN_IFREQ_SIZE];
+ struct ifreq *ifr = (struct ifreq *)buffer;
+ struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
+ struct dn_dev *dn_db;
+ struct net_device *dev;
+ struct dn_ifaddr *ifa = NULL, **ifap = NULL;
+ int ret = 0;
+
+ if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
+ return -EFAULT;
+ ifr->ifr_name[IFNAMSIZ-1] = 0;
+
+#ifdef CONFIG_KMOD
+ dev_load(ifr->ifr_name);
+#endif
+
+ switch(cmd) {
+ case SIOCGIFADDR:
+ break;
+ case SIOCSIFADDR:
+ if (!capable(CAP_NET_ADMIN))
+ return -EACCES;
+ if (sdn->sdn_family != AF_DECnet)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ rtnl_lock();
+
+ if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) {
+ ret = -ENODEV;
+ goto done;
+ }
+
+ if ((dn_db = dev->dn_ptr) != NULL) {
+ for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
+ if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
+ break;
+ }
+
+ if (ifa == NULL && cmd != SIOCSIFADDR) {
+ ret = -EADDRNOTAVAIL;
+ goto done;
+ }
+
+ switch(cmd) {
+ case SIOCGIFADDR:
+ *((dn_address *)sdn->sdn_nodeaddr) = ifa->ifa_local;
+ goto rarok;
+
+ case SIOCSIFADDR:
+ if (!ifa) {
+ if ((ifa = dn_dev_alloc_ifa()) == NULL) {
+ ret = -ENOBUFS;
+ break;
+ }
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+ } else {
+ if (ifa->ifa_local == dn_saddr2dn(sdn))
+ break;
+ dn_dev_del_ifa(dn_db, ifap, 0);
+ }
+
+ ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
+
+ ret = dn_dev_set_ifa(dev, ifa);
+ }
+done:
+ rtnl_unlock();
+
+ return ret;
+rarok:
+ if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
+ ret = -EFAULT;
+ goto done;
+}
+
+struct net_device *dn_dev_get_default(void)
+{
+ struct net_device *dev;
+ read_lock(&dndev_lock);
+ dev = decnet_default_device;
+ if (dev) {
+ if (dev->dn_ptr)
+ dev_hold(dev);
+ else
+ dev = NULL;
+ }
+ read_unlock(&dndev_lock);
+ return dev;
+}
+
+int dn_dev_set_default(struct net_device *dev, int force)
+{
+ struct net_device *old = NULL;
+ int rv = -EBUSY;
+ if (!dev->dn_ptr)
+ return -ENODEV;
+ write_lock(&dndev_lock);
+ if (force || decnet_default_device == NULL) {
+ old = decnet_default_device;
+ decnet_default_device = dev;
+ rv = 0;
+ }
+ write_unlock(&dndev_lock);
+ if (old)
+ dev_put(dev);
+ return rv;
+}
+
+static void dn_dev_check_default(struct net_device *dev)
+{
+ write_lock(&dndev_lock);
+ if (dev == decnet_default_device) {
+ decnet_default_device = NULL;
+ } else {
+ dev = NULL;
+ }
+ write_unlock(&dndev_lock);
+ if (dev)
+ dev_put(dev);
+}
+
+static struct dn_dev *dn_dev_by_index(int ifindex)
+{
+ struct net_device *dev;
+ struct dn_dev *dn_dev = NULL;
+ dev = dev_get_by_index(ifindex);
+ if (dev) {
+ dn_dev = dev->dn_ptr;
+ dev_put(dev);
+ }
+
+ return dn_dev;
+}
+
+static int dn_dev_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ struct dn_dev *dn_db;
+ struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
+ struct dn_ifaddr *ifa, **ifap;
+
+ if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
+ return -EADDRNOTAVAIL;
+
+ for(ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next) {
+ void *tmp = rta[IFA_LOCAL-1];
+ if ((tmp && memcmp(RTA_DATA(tmp), &ifa->ifa_local, 2)) ||
+ (rta[IFA_LABEL-1] && rtattr_strcmp(rta[IFA_LABEL-1], ifa->ifa_label)))
+ continue;
+
+ dn_dev_del_ifa(dn_db, ifap, 1);
+ return 0;
+ }
+
+ return -EADDRNOTAVAIL;
+}
+
+static int dn_dev_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ struct net_device *dev;
+ struct dn_dev *dn_db;
+ struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
+ struct dn_ifaddr *ifa;
+ int rv;
+
+ if (rta[IFA_LOCAL-1] == NULL)
+ return -EINVAL;
+
+ if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
+ return -ENODEV;
+
+ if ((dn_db = dev->dn_ptr) == NULL) {
+ int err;
+ dn_db = dn_dev_create(dev, &err);
+ if (!dn_db)
+ return err;
+ }
+
+ if ((ifa = dn_dev_alloc_ifa()) == NULL)
+ return -ENOBUFS;
+
+ if (!rta[IFA_ADDRESS - 1])
+ rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
+ memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL-1]), 2);
+ memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS-1]), 2);
+ ifa->ifa_flags = ifm->ifa_flags;
+ ifa->ifa_scope = ifm->ifa_scope;
+ ifa->ifa_dev = dn_db;
+ if (rta[IFA_LABEL-1])
+ rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL-1], IFNAMSIZ);
+ else
+ memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
+
+ rv = dn_dev_insert_ifa(dn_db, ifa);
+ if (rv)
+ dn_dev_free_ifa(ifa);
+ return rv;
+}
+
+static int dn_dev_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
+ u32 pid, u32 seq, int event)
+{
+ struct ifaddrmsg *ifm;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb->tail;
+
+ nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
+ ifm = NLMSG_DATA(nlh);
+
+ ifm->ifa_family = AF_DECnet;
+ ifm->ifa_prefixlen = 16;
+ ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
+ ifm->ifa_scope = ifa->ifa_scope;
+ ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
+ if (ifa->ifa_address)
+ RTA_PUT(skb, IFA_ADDRESS, 2, &ifa->ifa_address);
+ if (ifa->ifa_local)
+ RTA_PUT(skb, IFA_LOCAL, 2, &ifa->ifa_local);
+ if (ifa->ifa_label[0])
+ RTA_PUT(skb, IFA_LABEL, IFNAMSIZ, &ifa->ifa_label);
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+static void rtmsg_ifa(int event, struct dn_ifaddr *ifa)
+{
+ struct sk_buff *skb;
+ int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
+
+ skb = alloc_skb(size, GFP_KERNEL);
+ if (!skb) {
+ netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, ENOBUFS);
+ return;
+ }
+ if (dn_dev_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
+ kfree_skb(skb);
+ netlink_set_err(rtnl, 0, RTMGRP_DECnet_IFADDR, EINVAL);
+ return;
+ }
+ NETLINK_CB(skb).dst_groups = RTMGRP_DECnet_IFADDR;
+ netlink_broadcast(rtnl, skb, 0, RTMGRP_DECnet_IFADDR, GFP_KERNEL);
+}
+
+static int dn_dev_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int idx, dn_idx;
+ int s_idx, s_dn_idx;
+ struct net_device *dev;
+ struct dn_dev *dn_db;
+ struct dn_ifaddr *ifa;
+
+ s_idx = cb->args[0];
+ s_dn_idx = dn_idx = cb->args[1];
+ read_lock(&dev_base_lock);
+ for(dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
+ if (idx < s_idx)
+ continue;
+ if (idx > s_idx)
+ s_dn_idx = 0;
+ if ((dn_db = dev->dn_ptr) == NULL)
+ continue;
+
+ for(ifa = dn_db->ifa_list, dn_idx = 0; ifa; ifa = ifa->ifa_next, dn_idx++) {
+ if (dn_idx < s_dn_idx)
+ continue;
+
+ if (dn_dev_fill_ifaddr(skb, ifa,
+ NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWADDR) <= 0)
+ goto done;
+ }
+ }
+done:
+ read_unlock(&dev_base_lock);
+ cb->args[0] = idx;
+ cb->args[1] = dn_idx;
+
+ return skb->len;
+}
+
+static int dn_dev_get_first(struct net_device *dev, dn_address *addr)
+{
+ struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
+ struct dn_ifaddr *ifa;
+ int rv = -ENODEV;
+ if (dn_db == NULL)
+ goto out;
+ ifa = dn_db->ifa_list;
+ if (ifa != NULL) {
+ *addr = ifa->ifa_local;
+ rv = 0;
+ }
+out:
+ return rv;
+}
+
+/*
+ * Find a default address to bind to.
+ *
+ * This is one of those areas where the initial VMS concepts don't really
+ * map onto the Linux concepts, and since we introduced multiple addresses
+ * per interface we have to cope with slightly odd ways of finding out what
+ * "our address" really is. Mostly it's not a problem; for this we just guess
+ * a sensible default. Eventually the routing code will take care of all the
+ * nasties for us I hope.
+ */
+int dn_dev_bind_default(dn_address *addr)
+{
+ struct net_device *dev;
+ int rv;
+ dev = dn_dev_get_default();
+last_chance:
+ if (dev) {
+ read_lock(&dev_base_lock);
+ rv = dn_dev_get_first(dev, addr);
+ read_unlock(&dev_base_lock);
+ dev_put(dev);
+ if (rv == 0 || dev == &loopback_dev)
+ return rv;
+ }
+ dev = &loopback_dev;
+ dev_hold(dev);
+ goto last_chance;
+}
+
+static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
+{
+ struct endnode_hello_message *msg;
+ struct sk_buff *skb = NULL;
+ unsigned short int *pktlen;
+ struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
+
+ if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
+ return;
+
+ skb->dev = dev;
+
+ msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
+
+ msg->msgflg = 0x0D;
+ memcpy(msg->tiver, dn_eco_version, 3);
+ dn_dn2eth(msg->id, ifa->ifa_local);
+ msg->iinfo = DN_RT_INFO_ENDN;
+ msg->blksize = dn_htons(mtu2blksize(dev));
+ msg->area = 0x00;
+ memset(msg->seed, 0, 8);
+ memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
+
+ if (dn_db->router) {
+ struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
+ dn_dn2eth(msg->neighbor, dn->addr);
+ }
+
+ msg->timer = dn_htons((unsigned short)dn_db->parms.t3);
+ msg->mpd = 0x00;
+ msg->datalen = 0x02;
+ memset(msg->data, 0xAA, 2);
+
+ pktlen = (unsigned short *)skb_push(skb,2);
+ *pktlen = dn_htons(skb->len - 2);
+
+ skb->nh.raw = skb->data;
+
+ dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
+}
+
+
+#define DRDELAY (5 * HZ)
+
+static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
+{
+ /* First check time since device went up */
+ if ((jiffies - dn_db->uptime) < DRDELAY)
+ return 0;
+
+ /* If there is no router, then yes... */
+ if (!dn_db->router)
+ return 1;
+
+ /* otherwise only if we have a higher priority or.. */
+ if (dn->priority < dn_db->parms.priority)
+ return 1;
+
+ /* if we have equal priority and a higher node number */
+ if (dn->priority != dn_db->parms.priority)
+ return 0;
+
+ if (dn_ntohs(dn->addr) < dn_ntohs(ifa->ifa_local))
+ return 1;
+
+ return 0;
+}
+
+static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
+{
+ int n;
+ struct dn_dev *dn_db = dev->dn_ptr;
+ struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
+ struct sk_buff *skb;
+ size_t size;
+ unsigned char *ptr;
+ unsigned char *i1, *i2;
+ unsigned short *pktlen;
+ char *src;
+
+ if (mtu2blksize(dev) < (26 + 7))
+ return;
+
+ n = mtu2blksize(dev) - 26;
+ n /= 7;
+
+ if (n > 32)
+ n = 32;
+
+ size = 2 + 26 + 7 * n;
+
+ if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
+ return;
+
+ skb->dev = dev;
+ ptr = skb_put(skb, size);
+
+ *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
+ *ptr++ = 2; /* ECO */
+ *ptr++ = 0;
+ *ptr++ = 0;
+ dn_dn2eth(ptr, ifa->ifa_local);
+ src = ptr;
+ ptr += ETH_ALEN;
+ *ptr++ = dn_db->parms.forwarding == 1 ?
+ DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
+ *((unsigned short *)ptr) = dn_htons(mtu2blksize(dev));
+ ptr += 2;
+ *ptr++ = dn_db->parms.priority; /* Priority */
+ *ptr++ = 0; /* Area: Reserved */
+ *((unsigned short *)ptr) = dn_htons((unsigned short)dn_db->parms.t3);
+ ptr += 2;
+ *ptr++ = 0; /* MPD: Reserved */
+ i1 = ptr++;
+ memset(ptr, 0, 7); /* Name: Reserved */
+ ptr += 7;
+ i2 = ptr++;
+
+ n = dn_neigh_elist(dev, ptr, n);
+
+ *i2 = 7 * n;
+ *i1 = 8 + *i2;
+
+ skb_trim(skb, (27 + *i2));
+
+ pktlen = (unsigned short *)skb_push(skb, 2);
+ *pktlen = dn_htons(skb->len - 2);
+
+ skb->nh.raw = skb->data;
+
+ if (dn_am_i_a_router(dn, dn_db, ifa)) {
+ struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
+ if (skb2) {
+ dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
+ }
+ }
+
+ dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
+}
+
+static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
+{
+ struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
+
+ if (dn_db->parms.forwarding == 0)
+ dn_send_endnode_hello(dev, ifa);
+ else
+ dn_send_router_hello(dev, ifa);
+}
+
+static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
+{
+ int tdlen = 16;
+ int size = dev->hard_header_len + 2 + 4 + tdlen;
+ struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
+ int i;
+ unsigned char *ptr;
+ char src[ETH_ALEN];
+
+ if (skb == NULL)
+ return ;
+
+ skb->dev = dev;
+ skb_push(skb, dev->hard_header_len);
+ ptr = skb_put(skb, 2 + 4 + tdlen);
+
+ *ptr++ = DN_RT_PKT_HELO;
+ *((dn_address *)ptr) = ifa->ifa_local;
+ ptr += 2;
+ *ptr++ = tdlen;
+
+ for(i = 0; i < tdlen; i++)
+ *ptr++ = 0252;
+
+ dn_dn2eth(src, ifa->ifa_local);
+ dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
+}
+
+static int dn_eth_up(struct net_device *dev)
+{
+ struct dn_dev *dn_db = dev->dn_ptr;
+
+ if (dn_db->parms.forwarding == 0)
+ dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
+ else
+ dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
+
+ dev_mc_upload(dev);
+
+ dn_db->use_long = 1;
+
+ return 0;
+}
+
+static void dn_eth_down(struct net_device *dev)
+{
+ struct dn_dev *dn_db = dev->dn_ptr;
+
+ if (dn_db->parms.forwarding == 0)
+ dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
+ else
+ dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
+}
+
+static void dn_dev_set_timer(struct net_device *dev);
+
+static void dn_dev_timer_func(unsigned long arg)
+{
+ struct net_device *dev = (struct net_device *)arg;
+ struct dn_dev *dn_db = dev->dn_ptr;
+ struct dn_ifaddr *ifa;
+
+ if (dn_db->t3 <= dn_db->parms.t2) {
+ if (dn_db->parms.timer3) {
+ for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
+ if (!(ifa->ifa_flags & IFA_F_SECONDARY))
+ dn_db->parms.timer3(dev, ifa);
+ }
+ }
+ dn_db->t3 = dn_db->parms.t3;
+ } else {
+ dn_db->t3 -= dn_db->parms.t2;
+ }
+
+ dn_dev_set_timer(dev);
+}
+
+static void dn_dev_set_timer(struct net_device *dev)
+{
+ struct dn_dev *dn_db = dev->dn_ptr;
+
+ if (dn_db->parms.t2 > dn_db->parms.t3)
+ dn_db->parms.t2 = dn_db->parms.t3;
+
+ dn_db->timer.data = (unsigned long)dev;
+ dn_db->timer.function = dn_dev_timer_func;
+ dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
+
+ add_timer(&dn_db->timer);
+}
+
+struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
+{
+ int i;
+ struct dn_dev_parms *p = dn_dev_list;
+ struct dn_dev *dn_db;
+
+ for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
+ if (p->type == dev->type)
+ break;
+ }
+
+ *err = -ENODEV;
+ if (i == DN_DEV_LIST_SIZE)
+ return NULL;
+
+ *err = -ENOBUFS;
+ if ((dn_db = kmalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
+ return NULL;
+
+ memset(dn_db, 0, sizeof(struct dn_dev));
+ memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
+ smp_wmb();
+ dev->dn_ptr = dn_db;
+ dn_db->dev = dev;
+ init_timer(&dn_db->timer);
+
+ dn_db->uptime = jiffies;
+ if (dn_db->parms.up) {
+ if (dn_db->parms.up(dev) < 0) {
+ dev->dn_ptr = NULL;
+ kfree(dn_db);
+ return NULL;
+ }
+ }
+
+ dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
+
+ dn_dev_sysctl_register(dev, &dn_db->parms);
+
+ dn_dev_set_timer(dev);
+
+ *err = 0;
+ return dn_db;
+}
+
+
+/*
+ * This processes a device up event. We only start up
+ * the loopback device & ethernet devices with correct
+ * MAC addreses automatically. Others must be started
+ * specifically.
+ *
+ * FIXME: How should we configure the loopback address ? If we could dispense
+ * with using decnet_address here and for autobind, it will be one less thing
+ * for users to worry about setting up.
+ */
+
+void dn_dev_up(struct net_device *dev)
+{
+ struct dn_ifaddr *ifa;
+ dn_address addr = decnet_address;
+ int maybe_default = 0;
+ struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
+
+ if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
+ return;
+
+ /*
+ * Need to ensure that loopback device has a dn_db attached to it
+ * to allow creation of neighbours against it, even though it might
+ * not have a local address of its own. Might as well do the same for
+ * all autoconfigured interfaces.
+ */
+ if (dn_db == NULL) {
+ int err;
+ dn_db = dn_dev_create(dev, &err);
+ if (dn_db == NULL)
+ return;
+ }
+
+ if (dev->type == ARPHRD_ETHER) {
+ if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
+ return;
+ addr = dn_htons(dn_eth2dn(dev->dev_addr));
+ maybe_default = 1;
+ }
+
+ if (addr == 0)
+ return;
+
+ if ((ifa = dn_dev_alloc_ifa()) == NULL)
+ return;
+
+ ifa->ifa_local = ifa->ifa_address = addr;
+ ifa->ifa_flags = 0;
+ ifa->ifa_scope = RT_SCOPE_UNIVERSE;
+ strcpy(ifa->ifa_label, dev->name);
+
+ dn_dev_set_ifa(dev, ifa);
+
+ /*
+ * Automagically set the default device to the first automatically
+ * configured ethernet card in the system.
+ */
+ if (maybe_default) {
+ dev_hold(dev);
+ if (dn_dev_set_default(dev, 0))
+ dev_put(dev);
+ }
+}
+
+static void dn_dev_delete(struct net_device *dev)
+{
+ struct dn_dev *dn_db = dev->dn_ptr;
+
+ if (dn_db == NULL)
+ return;
+
+ del_timer_sync(&dn_db->timer);
+ dn_dev_sysctl_unregister(&dn_db->parms);
+ dn_dev_check_default(dev);
+ neigh_ifdown(&dn_neigh_table, dev);
+
+ if (dn_db->parms.down)
+ dn_db->parms.down(dev);
+
+ dev->dn_ptr = NULL;
+
+ neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
+ neigh_ifdown(&dn_neigh_table, dev);
+
+ if (dn_db->router)
+ neigh_release(dn_db->router);
+ if (dn_db->peer)
+ neigh_release(dn_db->peer);
+
+ kfree(dn_db);
+}
+
+void dn_dev_down(struct net_device *dev)
+{
+ struct dn_dev *dn_db = dev->dn_ptr;
+ struct dn_ifaddr *ifa;
+
+ if (dn_db == NULL)
+ return;
+
+ while((ifa = dn_db->ifa_list) != NULL) {
+ dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
+ dn_dev_free_ifa(ifa);
+ }
+
+ dn_dev_delete(dev);
+}
+
+void dn_dev_init_pkt(struct sk_buff *skb)
+{
+ return;
+}
+
+void dn_dev_veri_pkt(struct sk_buff *skb)
+{
+ return;
+}
+
+void dn_dev_hello(struct sk_buff *skb)
+{
+ return;
+}
+
+void dn_dev_devices_off(void)
+{
+ struct net_device *dev;
+
+ rtnl_lock();
+ for(dev = dev_base; dev; dev = dev->next)
+ dn_dev_down(dev);
+ rtnl_unlock();
+
+}
+
+void dn_dev_devices_on(void)
+{
+ struct net_device *dev;
+
+ rtnl_lock();
+ for(dev = dev_base; dev; dev = dev->next) {
+ if (dev->flags & IFF_UP)
+ dn_dev_up(dev);
+ }
+ rtnl_unlock();
+}
+
+int register_dnaddr_notifier(struct notifier_block *nb)
+{
+ return notifier_chain_register(&dnaddr_chain, nb);
+}
+
+int unregister_dnaddr_notifier(struct notifier_block *nb)
+{
+ return notifier_chain_unregister(&dnaddr_chain, nb);
+}
+
+#ifdef CONFIG_PROC_FS
+static inline struct net_device *dn_dev_get_next(struct seq_file *seq, struct net_device *dev)
+{
+ do {
+ dev = dev->next;
+ } while(dev && !dev->dn_ptr);
+
+ return dev;
+}
+
+static struct net_device *dn_dev_get_idx(struct seq_file *seq, loff_t pos)
+{
+ struct net_device *dev;
+
+ dev = dev_base;
+ if (dev && !dev->dn_ptr)
+ dev = dn_dev_get_next(seq, dev);
+ if (pos) {
+ while(dev && (dev = dn_dev_get_next(seq, dev)))
+ --pos;
+ }
+ return dev;
+}
+
+static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ if (*pos) {
+ struct net_device *dev;
+ read_lock(&dev_base_lock);
+ dev = dn_dev_get_idx(seq, *pos - 1);
+ if (dev == NULL)
+ read_unlock(&dev_base_lock);
+ return dev;
+ }
+ return SEQ_START_TOKEN;
+}
+
+static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct net_device *dev = v;
+ loff_t one = 1;
+
+ if (v == SEQ_START_TOKEN) {
+ dev = dn_dev_seq_start(seq, &one);
+ } else {
+ dev = dn_dev_get_next(seq, dev);
+ if (dev == NULL)
+ read_unlock(&dev_base_lock);
+ }
+ ++*pos;
+ return dev;
+}
+
+static void dn_dev_seq_stop(struct seq_file *seq, void *v)
+{
+ if (v && v != SEQ_START_TOKEN)
+ read_unlock(&dev_base_lock);
+}
+
+static char *dn_type2asc(char type)
+{
+ switch(type) {
+ case DN_DEV_BCAST:
+ return "B";
+ case DN_DEV_UCAST:
+ return "U";
+ case DN_DEV_MPOINT:
+ return "M";
+ }
+
+ return "?";
+}
+
+static int dn_dev_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN)
+ seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
+ else {
+ struct net_device *dev = v;
+ char peer_buf[DN_ASCBUF_LEN];
+ char router_buf[DN_ASCBUF_LEN];
+ struct dn_dev *dn_db = dev->dn_ptr;
+
+ seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
+ " %04hu %03d %02x %-10s %-7s %-7s\n",
+ dev->name ? dev->name : "???",
+ dn_type2asc(dn_db->parms.mode),
+ 0, 0,
+ dn_db->t3, dn_db->parms.t3,
+ mtu2blksize(dev),
+ dn_db->parms.priority,
+ dn_db->parms.state, dn_db->parms.name,
+ dn_db->router ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->router->primary_key), router_buf) : "",
+ dn_db->peer ? dn_addr2asc(dn_ntohs(*(dn_address *)dn_db->peer->primary_key), peer_buf) : "");
+ }
+ return 0;
+}
+
+static struct seq_operations dn_dev_seq_ops = {
+ .start = dn_dev_seq_start,
+ .next = dn_dev_seq_next,
+ .stop = dn_dev_seq_stop,
+ .show = dn_dev_seq_show,
+};
+
+static int dn_dev_seq_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &dn_dev_seq_ops);
+}
+
+static struct file_operations dn_dev_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = dn_dev_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+#endif /* CONFIG_PROC_FS */
+
+static struct rtnetlink_link dnet_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
+{
+ [4] = { .doit = dn_dev_rtm_newaddr, },
+ [5] = { .doit = dn_dev_rtm_deladdr, },
+ [6] = { .dumpit = dn_dev_dump_ifaddr, },
+
+#ifdef CONFIG_DECNET_ROUTER
+ [8] = { .doit = dn_fib_rtm_newroute, },
+ [9] = { .doit = dn_fib_rtm_delroute, },
+ [10] = { .doit = dn_cache_getroute, .dumpit = dn_fib_dump, },
+ [16] = { .doit = dn_fib_rtm_newrule, },
+ [17] = { .doit = dn_fib_rtm_delrule, },
+ [18] = { .dumpit = dn_fib_dump_rules, },
+#else
+ [10] = { .doit = dn_cache_getroute, .dumpit = dn_cache_dump, },
+#endif
+
+};
+
+static int __initdata addr[2];
+module_param_array(addr, int, NULL, 0444);
+MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
+
+void __init dn_dev_init(void)
+{
+ if (addr[0] > 63 || addr[0] < 0) {
+ printk(KERN_ERR "DECnet: Area must be between 0 and 63");
+ return;
+ }
+
+ if (addr[1] > 1023 || addr[1] < 0) {
+ printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
+ return;
+ }
+
+ decnet_address = dn_htons((addr[0] << 10) | addr[1]);
+
+ dn_dev_devices_on();
+
+ rtnetlink_links[PF_DECnet] = dnet_rtnetlink_table;
+
+ proc_net_fops_create("decnet_dev", S_IRUGO, &dn_dev_seq_fops);
+
+#ifdef CONFIG_SYSCTL
+ {
+ int i;
+ for(i = 0; i < DN_DEV_LIST_SIZE; i++)
+ dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
+ }
+#endif /* CONFIG_SYSCTL */
+}
+
+void __exit dn_dev_cleanup(void)
+{
+ rtnetlink_links[PF_DECnet] = NULL;
+
+#ifdef CONFIG_SYSCTL
+ {
+ int i;
+ for(i = 0; i < DN_DEV_LIST_SIZE; i++)
+ dn_dev_sysctl_unregister(&dn_dev_list[i]);
+ }
+#endif /* CONFIG_SYSCTL */
+
+ proc_net_remove("decnet_dev");
+
+ dn_dev_devices_off();
+}
diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c
new file mode 100644
index 0000000..9934b25
--- /dev/null
+++ b/net/decnet/dn_fib.c
@@ -0,0 +1,802 @@
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Routing Forwarding Information Base (Glue/Info List)
+ *
+ * Author: Steve Whitehouse <SteveW@ACM.org>
+ *
+ *
+ * Changes:
+ * Alexey Kuznetsov : SMP locking changes
+ * Steve Whitehouse : Rewrote it... Well to be more correct, I
+ * copied most of it from the ipv4 fib code.
+ * Steve Whitehouse : Updated it in style and fixed a few bugs
+ * which were fixed in the ipv4 code since
+ * this code was copied from it.
+ *
+ */
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/net.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/netdevice.h>
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include <asm/atomic.h>
+#include <asm/uaccess.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_route.h>
+#include <net/dn_fib.h>
+#include <net/dn_neigh.h>
+#include <net/dn_dev.h>
+
+#define RT_MIN_TABLE 1
+
+#define for_fib_info() { struct dn_fib_info *fi;\
+ for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
+#define endfor_fib_info() }
+
+#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
+ for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
+
+#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
+ for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
+
+#define endfor_nexthops(fi) }
+
+extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
+
+static DEFINE_SPINLOCK(dn_fib_multipath_lock);
+static struct dn_fib_info *dn_fib_info_list;
+static DEFINE_RWLOCK(dn_fib_info_lock);
+
+static struct
+{
+ int error;
+ u8 scope;
+} dn_fib_props[RTA_MAX+1] = {
+ [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
+ [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
+ [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+ [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+ [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+ [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
+ [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
+ [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
+};
+
+void dn_fib_free_info(struct dn_fib_info *fi)
+{
+ if (fi->fib_dead == 0) {
+ printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
+ return;
+ }
+
+ change_nexthops(fi) {
+ if (nh->nh_dev)
+ dev_put(nh->nh_dev);
+ nh->nh_dev = NULL;
+ } endfor_nexthops(fi);
+ kfree(fi);
+}
+
+void dn_fib_release_info(struct dn_fib_info *fi)
+{
+ write_lock(&dn_fib_info_lock);
+ if (fi && --fi->fib_treeref == 0) {
+ if (fi->fib_next)
+ fi->fib_next->fib_prev = fi->fib_prev;
+ if (fi->fib_prev)
+ fi->fib_prev->fib_next = fi->fib_next;
+ if (fi == dn_fib_info_list)
+ dn_fib_info_list = fi->fib_next;
+ fi->fib_dead = 1;
+ dn_fib_info_put(fi);
+ }
+ write_unlock(&dn_fib_info_lock);
+}
+
+static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
+{
+ const struct dn_fib_nh *onh = ofi->fib_nh;
+
+ for_nexthops(fi) {
+ if (nh->nh_oif != onh->nh_oif ||
+ nh->nh_gw != onh->nh_gw ||
+ nh->nh_scope != onh->nh_scope ||
+ nh->nh_weight != onh->nh_weight ||
+ ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
+ return -1;
+ onh++;
+ } endfor_nexthops(fi);
+ return 0;
+}
+
+static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
+{
+ for_fib_info() {
+ if (fi->fib_nhs != nfi->fib_nhs)
+ continue;
+ if (nfi->fib_protocol == fi->fib_protocol &&
+ nfi->fib_prefsrc == fi->fib_prefsrc &&
+ nfi->fib_priority == fi->fib_priority &&
+ memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
+ ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
+ (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
+ return fi;
+ } endfor_fib_info();
+ return NULL;
+}
+
+u16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
+{
+ while(RTA_OK(attr,attrlen)) {
+ if (attr->rta_type == type)
+ return *(u16*)RTA_DATA(attr);
+ attr = RTA_NEXT(attr, attrlen);
+ }
+
+ return 0;
+}
+
+static int dn_fib_count_nhs(struct rtattr *rta)
+{
+ int nhs = 0;
+ struct rtnexthop *nhp = RTA_DATA(rta);
+ int nhlen = RTA_PAYLOAD(rta);
+
+ while(nhlen >= (int)sizeof(struct rtnexthop)) {
+ if ((nhlen -= nhp->rtnh_len) < 0)
+ return 0;
+ nhs++;
+ nhp = RTNH_NEXT(nhp);
+ }
+
+ return nhs;
+}
+
+static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
+{
+ struct rtnexthop *nhp = RTA_DATA(rta);
+ int nhlen = RTA_PAYLOAD(rta);
+
+ change_nexthops(fi) {
+ int attrlen = nhlen - sizeof(struct rtnexthop);
+ if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
+ return -EINVAL;
+
+ nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
+ nh->nh_oif = nhp->rtnh_ifindex;
+ nh->nh_weight = nhp->rtnh_hops + 1;
+
+ if (attrlen) {
+ nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
+ }
+ nhp = RTNH_NEXT(nhp);
+ } endfor_nexthops(fi);
+
+ return 0;
+}
+
+
+static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
+{
+ int err;
+
+ if (nh->nh_gw) {
+ struct flowi fl;
+ struct dn_fib_res res;
+
+ memset(&fl, 0, sizeof(fl));
+
+ if (nh->nh_flags&RTNH_F_ONLINK) {
+ struct net_device *dev;
+
+ if (r->rtm_scope >= RT_SCOPE_LINK)
+ return -EINVAL;
+ if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
+ return -EINVAL;
+ if ((dev = __dev_get_by_index(nh->nh_oif)) == NULL)
+ return -ENODEV;
+ if (!(dev->flags&IFF_UP))
+ return -ENETDOWN;
+ nh->nh_dev = dev;
+ dev_hold(dev);
+ nh->nh_scope = RT_SCOPE_LINK;
+ return 0;
+ }
+
+ memset(&fl, 0, sizeof(fl));
+ fl.fld_dst = nh->nh_gw;
+ fl.oif = nh->nh_oif;
+ fl.fld_scope = r->rtm_scope + 1;
+
+ if (fl.fld_scope < RT_SCOPE_LINK)
+ fl.fld_scope = RT_SCOPE_LINK;
+
+ if ((err = dn_fib_lookup(&fl, &res)) != 0)
+ return err;
+
+ err = -EINVAL;
+ if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
+ goto out;
+ nh->nh_scope = res.scope;
+ nh->nh_oif = DN_FIB_RES_OIF(res);
+ nh->nh_dev = DN_FIB_RES_DEV(res);
+ if (nh->nh_dev == NULL)
+ goto out;
+ dev_hold(nh->nh_dev);
+ err = -ENETDOWN;
+ if (!(nh->nh_dev->flags & IFF_UP))
+ goto out;
+ err = 0;
+out:
+ dn_fib_res_put(&res);
+ return err;
+ } else {
+ struct net_device *dev;
+
+ if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
+ return -EINVAL;
+
+ dev = __dev_get_by_index(nh->nh_oif);
+ if (dev == NULL || dev->dn_ptr == NULL)
+ return -ENODEV;
+ if (!(dev->flags&IFF_UP))
+ return -ENETDOWN;
+ nh->nh_dev = dev;
+ dev_hold(nh->nh_dev);
+ nh->nh_scope = RT_SCOPE_HOST;
+ }
+
+ return 0;
+}
+
+
+struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
+{
+ int err;
+ struct dn_fib_info *fi = NULL;
+ struct dn_fib_info *ofi;
+ int nhs = 1;
+
+ if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
+ goto err_inval;
+
+ if (rta->rta_mp) {
+ nhs = dn_fib_count_nhs(rta->rta_mp);
+ if (nhs == 0)
+ goto err_inval;
+ }
+
+ fi = kmalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
+ err = -ENOBUFS;
+ if (fi == NULL)
+ goto failure;
+ memset(fi, 0, sizeof(*fi)+nhs*sizeof(struct dn_fib_nh));
+
+ fi->fib_protocol = r->rtm_protocol;
+ fi->fib_nhs = nhs;
+ fi->fib_flags = r->rtm_flags;
+ if (rta->rta_priority)
+ fi->fib_priority = *rta->rta_priority;
+ if (rta->rta_mx) {
+ int attrlen = RTA_PAYLOAD(rta->rta_mx);
+ struct rtattr *attr = RTA_DATA(rta->rta_mx);
+
+ while(RTA_OK(attr, attrlen)) {
+ unsigned flavour = attr->rta_type;
+ if (flavour) {
+ if (flavour > RTAX_MAX)
+ goto err_inval;
+ fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
+ }
+ attr = RTA_NEXT(attr, attrlen);
+ }
+ }
+ if (rta->rta_prefsrc)
+ memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
+
+ if (rta->rta_mp) {
+ if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
+ goto failure;
+ if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
+ goto err_inval;
+ if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
+ goto err_inval;
+ } else {
+ struct dn_fib_nh *nh = fi->fib_nh;
+ if (rta->rta_oif)
+ nh->nh_oif = *rta->rta_oif;
+ if (rta->rta_gw)
+ memcpy(&nh->nh_gw, rta->rta_gw, 2);
+ nh->nh_flags = r->rtm_flags;
+ nh->nh_weight = 1;
+ }
+
+ if (r->rtm_type == RTN_NAT) {
+ if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
+ goto err_inval;
+ memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
+ goto link_it;
+ }
+
+ if (dn_fib_props[r->rtm_type].error) {
+ if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
+ goto err_inval;
+ goto link_it;
+ }
+
+ if (r->rtm_scope > RT_SCOPE_HOST)
+ goto err_inval;
+
+ if (r->rtm_scope == RT_SCOPE_HOST) {
+ struct dn_fib_nh *nh = fi->fib_nh;
+
+ /* Local address is added */
+ if (nhs != 1 || nh->nh_gw)
+ goto err_inval;
+ nh->nh_scope = RT_SCOPE_NOWHERE;
+ nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif);
+ err = -ENODEV;
+ if (nh->nh_dev == NULL)
+ goto failure;
+ } else {
+ change_nexthops(fi) {
+ if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
+ goto failure;
+ } endfor_nexthops(fi)
+ }
+
+ if (fi->fib_prefsrc) {
+ if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
+ memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
+ if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
+ goto err_inval;
+ }
+
+link_it:
+ if ((ofi = dn_fib_find_info(fi)) != NULL) {
+ fi->fib_dead = 1;
+ dn_fib_free_info(fi);
+ ofi->fib_treeref++;
+ return ofi;
+ }
+
+ fi->fib_treeref++;
+ atomic_inc(&fi->fib_clntref);
+ write_lock(&dn_fib_info_lock);
+ fi->fib_next = dn_fib_info_list;
+ fi->fib_prev = NULL;
+ if (dn_fib_info_list)
+ dn_fib_info_list->fib_prev = fi;
+ dn_fib_info_list = fi;
+ write_unlock(&dn_fib_info_lock);
+ return fi;
+
+err_inval:
+ err = -EINVAL;
+
+failure:
+ *errp = err;
+ if (fi) {
+ fi->fib_dead = 1;
+ dn_fib_free_info(fi);
+ }
+
+ return NULL;
+}
+
+int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
+{
+ int err = dn_fib_props[type].error;
+
+ if (err == 0) {
+ if (fi->fib_flags & RTNH_F_DEAD)
+ return 1;
+
+ res->fi = fi;
+
+ switch(type) {
+ case RTN_NAT:
+ DN_FIB_RES_RESET(*res);
+ atomic_inc(&fi->fib_clntref);
+ return 0;
+ case RTN_UNICAST:
+ case RTN_LOCAL:
+ for_nexthops(fi) {
+ if (nh->nh_flags & RTNH_F_DEAD)
+ continue;
+ if (!fl->oif || fl->oif == nh->nh_oif)
+ break;
+ }
+ if (nhsel < fi->fib_nhs) {
+ res->nh_sel = nhsel;
+ atomic_inc(&fi->fib_clntref);
+ return 0;
+ }
+ endfor_nexthops(fi);
+ res->fi = NULL;
+ return 1;
+ default:
+ if (net_ratelimit())
+ printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
+ res->fi = NULL;
+ return -EINVAL;
+ }
+ }
+ return err;
+}
+
+void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
+{
+ struct dn_fib_info *fi = res->fi;
+ int w;
+
+ spin_lock_bh(&dn_fib_multipath_lock);
+ if (fi->fib_power <= 0) {
+ int power = 0;
+ change_nexthops(fi) {
+ if (!(nh->nh_flags&RTNH_F_DEAD)) {
+ power += nh->nh_weight;
+ nh->nh_power = nh->nh_weight;
+ }
+ } endfor_nexthops(fi);
+ fi->fib_power = power;
+ if (power < 0) {
+ spin_unlock_bh(&dn_fib_multipath_lock);
+ res->nh_sel = 0;
+ return;
+ }
+ }
+
+ w = jiffies % fi->fib_power;
+
+ change_nexthops(fi) {
+ if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
+ if ((w -= nh->nh_power) <= 0) {
+ nh->nh_power--;
+ fi->fib_power--;
+ res->nh_sel = nhsel;
+ spin_unlock_bh(&dn_fib_multipath_lock);
+ return;
+ }
+ }
+ } endfor_nexthops(fi);
+ res->nh_sel = 0;
+ spin_unlock_bh(&dn_fib_multipath_lock);
+}
+
+
+static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
+{
+ int i;
+
+ for(i = 1; i <= RTA_MAX; i++) {
+ struct rtattr *attr = rta[i-1];
+ if (attr) {
+ if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
+ return -EINVAL;
+ if (i != RTA_MULTIPATH && i != RTA_METRICS)
+ rta[i-1] = (struct rtattr *)RTA_DATA(attr);
+ }
+ }
+
+ return 0;
+}
+
+int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct dn_fib_table *tb;
+ struct rtattr **rta = arg;
+ struct rtmsg *r = NLMSG_DATA(nlh);
+
+ if (dn_fib_check_attr(r, rta))
+ return -EINVAL;
+
+ tb = dn_fib_get_table(r->rtm_table, 0);
+ if (tb)
+ return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
+
+ return -ESRCH;
+}
+
+int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct dn_fib_table *tb;
+ struct rtattr **rta = arg;
+ struct rtmsg *r = NLMSG_DATA(nlh);
+
+ if (dn_fib_check_attr(r, rta))
+ return -EINVAL;
+
+ tb = dn_fib_get_table(r->rtm_table, 1);
+ if (tb)
+ return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
+
+ return -ENOBUFS;
+}
+
+
+int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int t;
+ int s_t;
+ struct dn_fib_table *tb;
+
+ if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) &&
+ ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED)
+ return dn_cache_dump(skb, cb);
+
+ s_t = cb->args[0];
+ if (s_t == 0)
+ s_t = cb->args[0] = RT_MIN_TABLE;
+
+ for(t = s_t; t <= RT_TABLE_MAX; t++) {
+ if (t < s_t)
+ continue;
+ if (t > s_t)
+ memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(int));
+ tb = dn_fib_get_table(t, 0);
+ if (tb == NULL)
+ continue;
+ if (tb->dump(tb, skb, cb) < 0)
+ break;
+ }
+
+ cb->args[0] = t;
+
+ return skb->len;
+}
+
+static void fib_magic(int cmd, int type, __u16 dst, int dst_len, struct dn_ifaddr *ifa)
+{
+ struct dn_fib_table *tb;
+ struct {
+ struct nlmsghdr nlh;
+ struct rtmsg rtm;
+ } req;
+ struct dn_kern_rta rta;
+
+ memset(&req.rtm, 0, sizeof(req.rtm));
+ memset(&rta, 0, sizeof(rta));
+
+ if (type == RTN_UNICAST)
+ tb = dn_fib_get_table(RT_MIN_TABLE, 1);
+ else
+ tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
+
+ if (tb == NULL)
+ return;
+
+ req.nlh.nlmsg_len = sizeof(req);
+ req.nlh.nlmsg_type = cmd;
+ req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
+ req.nlh.nlmsg_pid = 0;
+ req.nlh.nlmsg_seq = 0;
+
+ req.rtm.rtm_dst_len = dst_len;
+ req.rtm.rtm_table = tb->n;
+ req.rtm.rtm_protocol = RTPROT_KERNEL;
+ req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
+ req.rtm.rtm_type = type;
+
+ rta.rta_dst = &dst;
+ rta.rta_prefsrc = &ifa->ifa_local;
+ rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
+
+ if (cmd == RTM_NEWROUTE)
+ tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
+ else
+ tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
+}
+
+static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
+{
+
+ fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
+
+#if 0
+ if (!(dev->flags&IFF_UP))
+ return;
+ /* In the future, we will want to add default routes here */
+
+#endif
+}
+
+static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
+{
+ int found_it = 0;
+ struct net_device *dev;
+ struct dn_dev *dn_db;
+ struct dn_ifaddr *ifa2;
+
+ ASSERT_RTNL();
+
+ /* Scan device list */
+ read_lock(&dev_base_lock);
+ for(dev = dev_base; dev; dev = dev->next) {
+ dn_db = dev->dn_ptr;
+ if (dn_db == NULL)
+ continue;
+ for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
+ if (ifa2->ifa_local == ifa->ifa_local) {
+ found_it = 1;
+ break;
+ }
+ }
+ }
+ read_unlock(&dev_base_lock);
+
+ if (found_it == 0) {
+ fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
+
+ if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
+ if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
+ dn_fib_flush();
+ }
+ }
+}
+
+static void dn_fib_disable_addr(struct net_device *dev, int force)
+{
+ if (dn_fib_sync_down(0, dev, force))
+ dn_fib_flush();
+ dn_rt_cache_flush(0);
+ neigh_ifdown(&dn_neigh_table, dev);
+}
+
+static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+ struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
+
+ switch(event) {
+ case NETDEV_UP:
+ dn_fib_add_ifaddr(ifa);
+ dn_fib_sync_up(ifa->ifa_dev->dev);
+ dn_rt_cache_flush(-1);
+ break;
+ case NETDEV_DOWN:
+ dn_fib_del_ifaddr(ifa);
+ if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
+ dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
+ } else {
+ dn_rt_cache_flush(-1);
+ }
+ break;
+ }
+ return NOTIFY_DONE;
+}
+
+int dn_fib_sync_down(dn_address local, struct net_device *dev, int force)
+{
+ int ret = 0;
+ int scope = RT_SCOPE_NOWHERE;
+
+ if (force)
+ scope = -1;
+
+ for_fib_info() {
+ /*
+ * This makes no sense for DECnet.... we will almost
+ * certainly have more than one local address the same
+ * over all our interfaces. It needs thinking about
+ * some more.
+ */
+ if (local && fi->fib_prefsrc == local) {
+ fi->fib_flags |= RTNH_F_DEAD;
+ ret++;
+ } else if (dev && fi->fib_nhs) {
+ int dead = 0;
+
+ change_nexthops(fi) {
+ if (nh->nh_flags&RTNH_F_DEAD)
+ dead++;
+ else if (nh->nh_dev == dev &&
+ nh->nh_scope != scope) {
+ spin_lock_bh(&dn_fib_multipath_lock);
+ nh->nh_flags |= RTNH_F_DEAD;
+ fi->fib_power -= nh->nh_power;
+ nh->nh_power = 0;
+ spin_unlock_bh(&dn_fib_multipath_lock);
+ dead++;
+ }
+ } endfor_nexthops(fi)
+ if (dead == fi->fib_nhs) {
+ fi->fib_flags |= RTNH_F_DEAD;
+ ret++;
+ }
+ }
+ } endfor_fib_info();
+ return ret;
+}
+
+
+int dn_fib_sync_up(struct net_device *dev)
+{
+ int ret = 0;
+
+ if (!(dev->flags&IFF_UP))
+ return 0;
+
+ for_fib_info() {
+ int alive = 0;
+
+ change_nexthops(fi) {
+ if (!(nh->nh_flags&RTNH_F_DEAD)) {
+ alive++;
+ continue;
+ }
+ if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
+ continue;
+ if (nh->nh_dev != dev || dev->dn_ptr == NULL)
+ continue;
+ alive++;
+ spin_lock_bh(&dn_fib_multipath_lock);
+ nh->nh_power = 0;
+ nh->nh_flags &= ~RTNH_F_DEAD;
+ spin_unlock_bh(&dn_fib_multipath_lock);
+ } endfor_nexthops(fi);
+
+ if (alive > 0) {
+ fi->fib_flags &= ~RTNH_F_DEAD;
+ ret++;
+ }
+ } endfor_fib_info();
+ return ret;
+}
+
+void dn_fib_flush(void)
+{
+ int flushed = 0;
+ struct dn_fib_table *tb;
+ int id;
+
+ for(id = RT_TABLE_MAX; id > 0; id--) {
+ if ((tb = dn_fib_get_table(id, 0)) == NULL)
+ continue;
+ flushed += tb->flush(tb);
+ }
+
+ if (flushed)
+ dn_rt_cache_flush(-1);
+}
+
+static struct notifier_block dn_fib_dnaddr_notifier = {
+ .notifier_call = dn_fib_dnaddr_event,
+};
+
+void __exit dn_fib_cleanup(void)
+{
+ dn_fib_table_cleanup();
+ dn_fib_rules_cleanup();
+
+ unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
+}
+
+
+void __init dn_fib_init(void)
+{
+
+ dn_fib_table_init();
+ dn_fib_rules_init();
+
+ register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
+}
+
+
diff --git a/net/decnet/dn_neigh.c b/net/decnet/dn_neigh.c
new file mode 100644
index 0000000..f6dfe96
--- /dev/null
+++ b/net/decnet/dn_neigh.c
@@ -0,0 +1,627 @@
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Neighbour Functions (Adjacency Database and
+ * On-Ethernet Cache)
+ *
+ * Author: Steve Whitehouse <SteveW@ACM.org>
+ *
+ *
+ * Changes:
+ * Steve Whitehouse : Fixed router listing routine
+ * Steve Whitehouse : Added error_report functions
+ * Steve Whitehouse : Added default router detection
+ * Steve Whitehouse : Hop counts in outgoing messages
+ * Steve Whitehouse : Fixed src/dst in outgoing messages so
+ * forwarding now stands a good chance of
+ * working.
+ * Steve Whitehouse : Fixed neighbour states (for now anyway).
+ * Steve Whitehouse : Made error_report functions dummies. This
+ * is not the right place to return skbs.
+ * Steve Whitehouse : Convert to seq_file
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/net.h>
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/string.h>
+#include <linux/netfilter_decnet.h>
+#include <linux/spinlock.h>
+#include <linux/seq_file.h>
+#include <linux/rcupdate.h>
+#include <linux/jhash.h>
+#include <asm/atomic.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_dev.h>
+#include <net/dn_neigh.h>
+#include <net/dn_route.h>
+
+static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev);
+static int dn_neigh_construct(struct neighbour *);
+static void dn_long_error_report(struct neighbour *, struct sk_buff *);
+static void dn_short_error_report(struct neighbour *, struct sk_buff *);
+static int dn_long_output(struct sk_buff *);
+static int dn_short_output(struct sk_buff *);
+static int dn_phase3_output(struct sk_buff *);
+
+
+/*
+ * For talking to broadcast devices: Ethernet & PPP
+ */
+static struct neigh_ops dn_long_ops = {
+ .family = AF_DECnet,
+ .error_report = dn_long_error_report,
+ .output = dn_long_output,
+ .connected_output = dn_long_output,
+ .hh_output = dev_queue_xmit,
+ .queue_xmit = dev_queue_xmit,
+};
+
+/*
+ * For talking to pointopoint and multidrop devices: DDCMP and X.25
+ */
+static struct neigh_ops dn_short_ops = {
+ .family = AF_DECnet,
+ .error_report = dn_short_error_report,
+ .output = dn_short_output,
+ .connected_output = dn_short_output,
+ .hh_output = dev_queue_xmit,
+ .queue_xmit = dev_queue_xmit,
+};
+
+/*
+ * For talking to DECnet phase III nodes
+ */
+static struct neigh_ops dn_phase3_ops = {
+ .family = AF_DECnet,
+ .error_report = dn_short_error_report, /* Can use short version here */
+ .output = dn_phase3_output,
+ .connected_output = dn_phase3_output,
+ .hh_output = dev_queue_xmit,
+ .queue_xmit = dev_queue_xmit
+};
+
+struct neigh_table dn_neigh_table = {
+ .family = PF_DECnet,
+ .entry_size = sizeof(struct dn_neigh),
+ .key_len = sizeof(dn_address),
+ .hash = dn_neigh_hash,
+ .constructor = dn_neigh_construct,
+ .id = "dn_neigh_cache",
+ .parms ={
+ .tbl = &dn_neigh_table,
+ .entries = 0,
+ .base_reachable_time = 30 * HZ,
+ .retrans_time = 1 * HZ,
+ .gc_staletime = 60 * HZ,
+ .reachable_time = 30 * HZ,
+ .delay_probe_time = 5 * HZ,
+ .queue_len = 3,
+ .ucast_probes = 0,
+ .app_probes = 0,
+ .mcast_probes = 0,
+ .anycast_delay = 0,
+ .proxy_delay = 0,
+ .proxy_qlen = 0,
+ .locktime = 1 * HZ,
+ },
+ .gc_interval = 30 * HZ,
+ .gc_thresh1 = 128,
+ .gc_thresh2 = 512,
+ .gc_thresh3 = 1024,
+};
+
+static u32 dn_neigh_hash(const void *pkey, const struct net_device *dev)
+{
+ return jhash_2words(*(dn_address *)pkey, 0, dn_neigh_table.hash_rnd);
+}
+
+static int dn_neigh_construct(struct neighbour *neigh)
+{
+ struct net_device *dev = neigh->dev;
+ struct dn_neigh *dn = (struct dn_neigh *)neigh;
+ struct dn_dev *dn_db;
+ struct neigh_parms *parms;
+
+ rcu_read_lock();
+ dn_db = rcu_dereference(dev->dn_ptr);
+ if (dn_db == NULL) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+
+ parms = dn_db->neigh_parms;
+ if (!parms) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+
+ __neigh_parms_put(neigh->parms);
+ neigh->parms = neigh_parms_clone(parms);
+ rcu_read_unlock();
+
+ if (dn_db->use_long)
+ neigh->ops = &dn_long_ops;
+ else
+ neigh->ops = &dn_short_ops;
+
+ if (dn->flags & DN_NDFLAG_P3)
+ neigh->ops = &dn_phase3_ops;
+
+ neigh->nud_state = NUD_NOARP;
+ neigh->output = neigh->ops->connected_output;
+
+ if ((dev->type == ARPHRD_IPGRE) || (dev->flags & IFF_POINTOPOINT))
+ memcpy(neigh->ha, dev->broadcast, dev->addr_len);
+ else if ((dev->type == ARPHRD_ETHER) || (dev->type == ARPHRD_LOOPBACK))
+ dn_dn2eth(neigh->ha, dn->addr);
+ else {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "Trying to create neigh for hw %d\n", dev->type);
+ return -EINVAL;
+ }
+
+ /*
+ * Make an estimate of the remote block size by assuming that its
+ * two less then the device mtu, which it true for ethernet (and
+ * other things which support long format headers) since there is
+ * an extra length field (of 16 bits) which isn't part of the
+ * ethernet headers and which the DECnet specs won't admit is part
+ * of the DECnet routing headers either.
+ *
+ * If we over estimate here its no big deal, the NSP negotiations
+ * will prevent us from sending packets which are too large for the
+ * remote node to handle. In any case this figure is normally updated
+ * by a hello message in most cases.
+ */
+ dn->blksize = dev->mtu - 2;
+
+ return 0;
+}
+
+static void dn_long_error_report(struct neighbour *neigh, struct sk_buff *skb)
+{
+ printk(KERN_DEBUG "dn_long_error_report: called\n");
+ kfree_skb(skb);
+}
+
+
+static void dn_short_error_report(struct neighbour *neigh, struct sk_buff *skb)
+{
+ printk(KERN_DEBUG "dn_short_error_report: called\n");
+ kfree_skb(skb);
+}
+
+static int dn_neigh_output_packet(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb->dst;
+ struct dn_route *rt = (struct dn_route *)dst;
+ struct neighbour *neigh = dst->neighbour;
+ struct net_device *dev = neigh->dev;
+ char mac_addr[ETH_ALEN];
+
+ dn_dn2eth(mac_addr, rt->rt_local_src);
+ if (!dev->hard_header || dev->hard_header(skb, dev, ntohs(skb->protocol), neigh->ha, mac_addr, skb->len) >= 0)
+ return neigh->ops->queue_xmit(skb);
+
+ if (net_ratelimit())
+ printk(KERN_DEBUG "dn_neigh_output_packet: oops, can't send packet\n");
+
+ kfree_skb(skb);
+ return -EINVAL;
+}
+
+static int dn_long_output(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb->dst;
+ struct neighbour *neigh = dst->neighbour;
+ struct net_device *dev = neigh->dev;
+ int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3;
+ unsigned char *data;
+ struct dn_long_packet *lp;
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+
+
+ if (skb_headroom(skb) < headroom) {
+ struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
+ if (skb2 == NULL) {
+ if (net_ratelimit())
+ printk(KERN_CRIT "dn_long_output: no memory\n");
+ kfree_skb(skb);
+ return -ENOBUFS;
+ }
+ kfree_skb(skb);
+ skb = skb2;
+ if (net_ratelimit())
+ printk(KERN_INFO "dn_long_output: Increasing headroom\n");
+ }
+
+ data = skb_push(skb, sizeof(struct dn_long_packet) + 3);
+ lp = (struct dn_long_packet *)(data+3);
+
+ *((unsigned short *)data) = dn_htons(skb->len - 2);
+ *(data + 2) = 1 | DN_RT_F_PF; /* Padding */
+
+ lp->msgflg = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS));
+ lp->d_area = lp->d_subarea = 0;
+ dn_dn2eth(lp->d_id, dn_ntohs(cb->dst));
+ lp->s_area = lp->s_subarea = 0;
+ dn_dn2eth(lp->s_id, dn_ntohs(cb->src));
+ lp->nl2 = 0;
+ lp->visit_ct = cb->hops & 0x3f;
+ lp->s_class = 0;
+ lp->pt = 0;
+
+ skb->nh.raw = skb->data;
+
+ return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
+}
+
+static int dn_short_output(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb->dst;
+ struct neighbour *neigh = dst->neighbour;
+ struct net_device *dev = neigh->dev;
+ int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
+ struct dn_short_packet *sp;
+ unsigned char *data;
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+
+
+ if (skb_headroom(skb) < headroom) {
+ struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
+ if (skb2 == NULL) {
+ if (net_ratelimit())
+ printk(KERN_CRIT "dn_short_output: no memory\n");
+ kfree_skb(skb);
+ return -ENOBUFS;
+ }
+ kfree_skb(skb);
+ skb = skb2;
+ if (net_ratelimit())
+ printk(KERN_INFO "dn_short_output: Increasing headroom\n");
+ }
+
+ data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
+ *((unsigned short *)data) = dn_htons(skb->len - 2);
+ sp = (struct dn_short_packet *)(data+2);
+
+ sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
+ sp->dstnode = cb->dst;
+ sp->srcnode = cb->src;
+ sp->forward = cb->hops & 0x3f;
+
+ skb->nh.raw = skb->data;
+
+ return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
+}
+
+/*
+ * Phase 3 output is the same is short output, execpt that
+ * it clears the area bits before transmission.
+ */
+static int dn_phase3_output(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb->dst;
+ struct neighbour *neigh = dst->neighbour;
+ struct net_device *dev = neigh->dev;
+ int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
+ struct dn_short_packet *sp;
+ unsigned char *data;
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+
+ if (skb_headroom(skb) < headroom) {
+ struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
+ if (skb2 == NULL) {
+ if (net_ratelimit())
+ printk(KERN_CRIT "dn_phase3_output: no memory\n");
+ kfree_skb(skb);
+ return -ENOBUFS;
+ }
+ kfree_skb(skb);
+ skb = skb2;
+ if (net_ratelimit())
+ printk(KERN_INFO "dn_phase3_output: Increasing headroom\n");
+ }
+
+ data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
+ *((unsigned short *)data) = dn_htons(skb->len - 2);
+ sp = (struct dn_short_packet *)(data + 2);
+
+ sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
+ sp->dstnode = cb->dst & dn_htons(0x03ff);
+ sp->srcnode = cb->src & dn_htons(0x03ff);
+ sp->forward = cb->hops & 0x3f;
+
+ skb->nh.raw = skb->data;
+
+ return NF_HOOK(PF_DECnet, NF_DN_POST_ROUTING, skb, NULL, neigh->dev, dn_neigh_output_packet);
+}
+
+/*
+ * Unfortunately, the neighbour code uses the device in its hash
+ * function, so we don't get any advantage from it. This function
+ * basically does a neigh_lookup(), but without comparing the device
+ * field. This is required for the On-Ethernet cache
+ */
+
+/*
+ * Pointopoint link receives a hello message
+ */
+void dn_neigh_pointopoint_hello(struct sk_buff *skb)
+{
+ kfree_skb(skb);
+}
+
+/*
+ * Ethernet router hello message received
+ */
+int dn_neigh_router_hello(struct sk_buff *skb)
+{
+ struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data;
+
+ struct neighbour *neigh;
+ struct dn_neigh *dn;
+ struct dn_dev *dn_db;
+ dn_address src;
+
+ src = dn_htons(dn_eth2dn(msg->id));
+
+ neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
+
+ dn = (struct dn_neigh *)neigh;
+
+ if (neigh) {
+ write_lock(&neigh->lock);
+
+ neigh->used = jiffies;
+ dn_db = (struct dn_dev *)neigh->dev->dn_ptr;
+
+ if (!(neigh->nud_state & NUD_PERMANENT)) {
+ neigh->updated = jiffies;
+
+ if (neigh->dev->type == ARPHRD_ETHER)
+ memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
+
+ dn->blksize = dn_ntohs(msg->blksize);
+ dn->priority = msg->priority;
+
+ dn->flags &= ~DN_NDFLAG_P3;
+
+ switch(msg->iinfo & DN_RT_INFO_TYPE) {
+ case DN_RT_INFO_L1RT:
+ dn->flags &=~DN_NDFLAG_R2;
+ dn->flags |= DN_NDFLAG_R1;
+ break;
+ case DN_RT_INFO_L2RT:
+ dn->flags |= DN_NDFLAG_R2;
+ }
+ }
+
+ if (!dn_db->router) {
+ dn_db->router = neigh_clone(neigh);
+ } else {
+ if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
+ neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
+ }
+ write_unlock(&neigh->lock);
+ neigh_release(neigh);
+ }
+
+ kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * Endnode hello message received
+ */
+int dn_neigh_endnode_hello(struct sk_buff *skb)
+{
+ struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data;
+ struct neighbour *neigh;
+ struct dn_neigh *dn;
+ dn_address src;
+
+ src = dn_htons(dn_eth2dn(msg->id));
+
+ neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
+
+ dn = (struct dn_neigh *)neigh;
+
+ if (neigh) {
+ write_lock(&neigh->lock);
+
+ neigh->used = jiffies;
+
+ if (!(neigh->nud_state & NUD_PERMANENT)) {
+ neigh->updated = jiffies;
+
+ if (neigh->dev->type == ARPHRD_ETHER)
+ memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
+ dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2);
+ dn->blksize = dn_ntohs(msg->blksize);
+ dn->priority = 0;
+ }
+
+ write_unlock(&neigh->lock);
+ neigh_release(neigh);
+ }
+
+ kfree_skb(skb);
+ return 0;
+}
+
+static char *dn_find_slot(char *base, int max, int priority)
+{
+ int i;
+ unsigned char *min = NULL;
+
+ base += 6; /* skip first id */
+
+ for(i = 0; i < max; i++) {
+ if (!min || (*base < *min))
+ min = base;
+ base += 7; /* find next priority */
+ }
+
+ if (!min)
+ return NULL;
+
+ return (*min < priority) ? (min - 6) : NULL;
+}
+
+struct elist_cb_state {
+ struct net_device *dev;
+ unsigned char *ptr;
+ unsigned char *rs;
+ int t, n;
+};
+
+static void neigh_elist_cb(struct neighbour *neigh, void *_info)
+{
+ struct elist_cb_state *s = _info;
+ struct dn_dev *dn_db;
+ struct dn_neigh *dn;
+
+ if (neigh->dev != s->dev)
+ return;
+
+ dn = (struct dn_neigh *) neigh;
+ if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2)))
+ return;
+
+ dn_db = (struct dn_dev *) s->dev->dn_ptr;
+ if (dn_db->parms.forwarding == 1 && (dn->flags & DN_NDFLAG_R2))
+ return;
+
+ if (s->t == s->n)
+ s->rs = dn_find_slot(s->ptr, s->n, dn->priority);
+ else
+ s->t++;
+ if (s->rs == NULL)
+ return;
+
+ dn_dn2eth(s->rs, dn->addr);
+ s->rs += 6;
+ *(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0;
+ *(s->rs) |= dn->priority;
+ s->rs++;
+}
+
+int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n)
+{
+ struct elist_cb_state state;
+
+ state.dev = dev;
+ state.t = 0;
+ state.n = n;
+ state.ptr = ptr;
+ state.rs = ptr;
+
+ neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state);
+
+ return state.t;
+}
+
+
+#ifdef CONFIG_PROC_FS
+
+static inline void dn_neigh_format_entry(struct seq_file *seq,
+ struct neighbour *n)
+{
+ struct dn_neigh *dn = (struct dn_neigh *) n;
+ char buf[DN_ASCBUF_LEN];
+
+ read_lock(&n->lock);
+ seq_printf(seq, "%-7s %s%s%s %02x %02d %07ld %-8s\n",
+ dn_addr2asc(dn_ntohs(dn->addr), buf),
+ (dn->flags&DN_NDFLAG_R1) ? "1" : "-",
+ (dn->flags&DN_NDFLAG_R2) ? "2" : "-",
+ (dn->flags&DN_NDFLAG_P3) ? "3" : "-",
+ dn->n.nud_state,
+ atomic_read(&dn->n.refcnt),
+ dn->blksize,
+ (dn->n.dev) ? dn->n.dev->name : "?");
+ read_unlock(&n->lock);
+}
+
+static int dn_neigh_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq, "Addr Flags State Use Blksize Dev\n");
+ } else {
+ dn_neigh_format_entry(seq, v);
+ }
+
+ return 0;
+}
+
+static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ return neigh_seq_start(seq, pos, &dn_neigh_table,
+ NEIGH_SEQ_NEIGH_ONLY);
+}
+
+static struct seq_operations dn_neigh_seq_ops = {
+ .start = dn_neigh_seq_start,
+ .next = neigh_seq_next,
+ .stop = neigh_seq_stop,
+ .show = dn_neigh_seq_show,
+};
+
+static int dn_neigh_seq_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq;
+ int rc = -ENOMEM;
+ struct neigh_seq_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+ if (!s)
+ goto out;
+
+ memset(s, 0, sizeof(*s));
+ rc = seq_open(file, &dn_neigh_seq_ops);
+ if (rc)
+ goto out_kfree;
+
+ seq = file->private_data;
+ seq->private = s;
+ memset(s, 0, sizeof(*s));
+out:
+ return rc;
+out_kfree:
+ kfree(s);
+ goto out;
+}
+
+static struct file_operations dn_neigh_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = dn_neigh_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
+#endif
+
+void __init dn_neigh_init(void)
+{
+ neigh_table_init(&dn_neigh_table);
+ proc_net_fops_create("decnet_neigh", S_IRUGO, &dn_neigh_seq_fops);
+}
+
+void __exit dn_neigh_cleanup(void)
+{
+ proc_net_remove("decnet_neigh");
+ neigh_table_clear(&dn_neigh_table);
+}
diff --git a/net/decnet/dn_nsp_in.c b/net/decnet/dn_nsp_in.c
new file mode 100644
index 0000000..202dbde
--- /dev/null
+++ b/net/decnet/dn_nsp_in.c
@@ -0,0 +1,934 @@
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Network Services Protocol (Input)
+ *
+ * Author: Eduardo Marcelo Serrat <emserrat@geocities.com>
+ *
+ * Changes:
+ *
+ * Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from
+ * original dn_nsp.c.
+ * Steve Whitehouse: Updated to work with my new routing architecture.
+ * Steve Whitehouse: Add changes from Eduardo Serrat's patches.
+ * Steve Whitehouse: Put all ack handling code in a common routine.
+ * Steve Whitehouse: Put other common bits into dn_nsp_rx()
+ * Steve Whitehouse: More checks on skb->len to catch bogus packets
+ * Fixed various race conditions and possible nasties.
+ * Steve Whitehouse: Now handles returned conninit frames.
+ * David S. Miller: New socket locking
+ * Steve Whitehouse: Fixed lockup when socket filtering was enabled.
+ * Paul Koning: Fix to push CC sockets into RUN when acks are
+ * received.
+ * Steve Whitehouse:
+ * Patrick Caulfield: Checking conninits for correctness & sending of error
+ * responses.
+ * Steve Whitehouse: Added backlog congestion level return codes.
+ * Patrick Caulfield:
+ * Steve Whitehouse: Added flow control support (outbound)
+ * Steve Whitehouse: Prepare for nonlinear skbs
+ */
+
+/******************************************************************************
+ (c) 1995-1998 E.M. Serrat emserrat@geocities.com
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+*******************************************************************************/
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/inet.h>
+#include <linux/route.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/termios.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/netfilter_decnet.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/dn.h>
+#include <net/dn_nsp.h>
+#include <net/dn_dev.h>
+#include <net/dn_route.h>
+
+extern int decnet_log_martians;
+
+static void dn_log_martian(struct sk_buff *skb, const char *msg)
+{
+ if (decnet_log_martians && net_ratelimit()) {
+ char *devname = skb->dev ? skb->dev->name : "???";
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ printk(KERN_INFO "DECnet: Martian packet (%s) dev=%s src=0x%04hx dst=0x%04hx srcport=0x%04hx dstport=0x%04hx\n", msg, devname, cb->src, cb->dst, cb->src_port, cb->dst_port);
+ }
+}
+
+/*
+ * For this function we've flipped the cross-subchannel bit
+ * if the message is an otherdata or linkservice message. Thus
+ * we can use it to work out what to update.
+ */
+static void dn_ack(struct sock *sk, struct sk_buff *skb, unsigned short ack)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ unsigned short type = ((ack >> 12) & 0x0003);
+ int wakeup = 0;
+
+ switch(type) {
+ case 0: /* ACK - Data */
+ if (dn_after(ack, scp->ackrcv_dat)) {
+ scp->ackrcv_dat = ack & 0x0fff;
+ wakeup |= dn_nsp_check_xmit_queue(sk, skb, &scp->data_xmit_queue, ack);
+ }
+ break;
+ case 1: /* NAK - Data */
+ break;
+ case 2: /* ACK - OtherData */
+ if (dn_after(ack, scp->ackrcv_oth)) {
+ scp->ackrcv_oth = ack & 0x0fff;
+ wakeup |= dn_nsp_check_xmit_queue(sk, skb, &scp->other_xmit_queue, ack);
+ }
+ break;
+ case 3: /* NAK - OtherData */
+ break;
+ }
+
+ if (wakeup && !sock_flag(sk, SOCK_DEAD))
+ sk->sk_state_change(sk);
+}
+
+/*
+ * This function is a universal ack processor.
+ */
+static int dn_process_ack(struct sock *sk, struct sk_buff *skb, int oth)
+{
+ unsigned short *ptr = (unsigned short *)skb->data;
+ int len = 0;
+ unsigned short ack;
+
+ if (skb->len < 2)
+ return len;
+
+ if ((ack = dn_ntohs(*ptr)) & 0x8000) {
+ skb_pull(skb, 2);
+ ptr++;
+ len += 2;
+ if ((ack & 0x4000) == 0) {
+ if (oth)
+ ack ^= 0x2000;
+ dn_ack(sk, skb, ack);
+ }
+ }
+
+ if (skb->len < 2)
+ return len;
+
+ if ((ack = dn_ntohs(*ptr)) & 0x8000) {
+ skb_pull(skb, 2);
+ len += 2;
+ if ((ack & 0x4000) == 0) {
+ if (oth)
+ ack ^= 0x2000;
+ dn_ack(sk, skb, ack);
+ }
+ }
+
+ return len;
+}
+
+
+/**
+ * dn_check_idf - Check an image data field format is correct.
+ * @pptr: Pointer to pointer to image data
+ * @len: Pointer to length of image data
+ * @max: The maximum allowed length of the data in the image data field
+ * @follow_on: Check that this many bytes exist beyond the end of the image data
+ *
+ * Returns: 0 if ok, -1 on error
+ */
+static inline int dn_check_idf(unsigned char **pptr, int *len, unsigned char max, unsigned char follow_on)
+{
+ unsigned char *ptr = *pptr;
+ unsigned char flen = *ptr++;
+
+ (*len)--;
+ if (flen > max)
+ return -1;
+ if ((flen + follow_on) > *len)
+ return -1;
+
+ *len -= flen;
+ *pptr = ptr + flen;
+ return 0;
+}
+
+/*
+ * Table of reason codes to pass back to node which sent us a badly
+ * formed message, plus text messages for the log. A zero entry in
+ * the reason field means "don't reply" otherwise a disc init is sent with
+ * the specified reason code.
+ */
+static struct {
+ unsigned short reason;
+ const char *text;
+} ci_err_table[] = {
+ { 0, "CI: Truncated message" },
+ { NSP_REASON_ID, "CI: Destination username error" },
+ { NSP_REASON_ID, "CI: Destination username type" },
+ { NSP_REASON_US, "CI: Source username error" },
+ { 0, "CI: Truncated at menuver" },
+ { 0, "CI: Truncated before access or user data" },
+ { NSP_REASON_IO, "CI: Access data format error" },
+ { NSP_REASON_IO, "CI: User data format error" }
+};
+
+/*
+ * This function uses a slightly different lookup method
+ * to find its sockets, since it searches on object name/number
+ * rather than port numbers. Various tests are done to ensure that
+ * the incoming data is in the correct format before it is queued to
+ * a socket.
+ */
+static struct sock *dn_find_listener(struct sk_buff *skb, unsigned short *reason)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct nsp_conn_init_msg *msg = (struct nsp_conn_init_msg *)skb->data;
+ struct sockaddr_dn dstaddr;
+ struct sockaddr_dn srcaddr;
+ unsigned char type = 0;
+ int dstlen;
+ int srclen;
+ unsigned char *ptr;
+ int len;
+ int err = 0;
+ unsigned char menuver;
+
+ memset(&dstaddr, 0, sizeof(struct sockaddr_dn));
+ memset(&srcaddr, 0, sizeof(struct sockaddr_dn));
+
+ /*
+ * 1. Decode & remove message header
+ */
+ cb->src_port = msg->srcaddr;
+ cb->dst_port = msg->dstaddr;
+ cb->services = msg->services;
+ cb->info = msg->info;
+ cb->segsize = dn_ntohs(msg->segsize);
+
+ if (!pskb_may_pull(skb, sizeof(*msg)))
+ goto err_out;
+
+ skb_pull(skb, sizeof(*msg));
+
+ len = skb->len;
+ ptr = skb->data;
+
+ /*
+ * 2. Check destination end username format
+ */
+ dstlen = dn_username2sockaddr(ptr, len, &dstaddr, &type);
+ err++;
+ if (dstlen < 0)
+ goto err_out;
+
+ err++;
+ if (type > 1)
+ goto err_out;
+
+ len -= dstlen;
+ ptr += dstlen;
+
+ /*
+ * 3. Check source end username format
+ */
+ srclen = dn_username2sockaddr(ptr, len, &srcaddr, &type);
+ err++;
+ if (srclen < 0)
+ goto err_out;
+
+ len -= srclen;
+ ptr += srclen;
+ err++;
+ if (len < 1)
+ goto err_out;
+
+ menuver = *ptr;
+ ptr++;
+ len--;
+
+ /*
+ * 4. Check that optional data actually exists if menuver says it does
+ */
+ err++;
+ if ((menuver & (DN_MENUVER_ACC | DN_MENUVER_USR)) && (len < 1))
+ goto err_out;
+
+ /*
+ * 5. Check optional access data format
+ */
+ err++;
+ if (menuver & DN_MENUVER_ACC) {
+ if (dn_check_idf(&ptr, &len, 39, 1))
+ goto err_out;
+ if (dn_check_idf(&ptr, &len, 39, 1))
+ goto err_out;
+ if (dn_check_idf(&ptr, &len, 39, (menuver & DN_MENUVER_USR) ? 1 : 0))
+ goto err_out;
+ }
+
+ /*
+ * 6. Check optional user data format
+ */
+ err++;
+ if (menuver & DN_MENUVER_USR) {
+ if (dn_check_idf(&ptr, &len, 16, 0))
+ goto err_out;
+ }
+
+ /*
+ * 7. Look up socket based on destination end username
+ */
+ return dn_sklist_find_listener(&dstaddr);
+err_out:
+ dn_log_martian(skb, ci_err_table[err].text);
+ *reason = ci_err_table[err].reason;
+ return NULL;
+}
+
+
+static void dn_nsp_conn_init(struct sock *sk, struct sk_buff *skb)
+{
+ if (sk_acceptq_is_full(sk)) {
+ kfree_skb(skb);
+ return;
+ }
+
+ sk->sk_ack_backlog++;
+ skb_queue_tail(&sk->sk_receive_queue, skb);
+ sk->sk_state_change(sk);
+}
+
+static void dn_nsp_conn_conf(struct sock *sk, struct sk_buff *skb)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct dn_scp *scp = DN_SK(sk);
+ unsigned char *ptr;
+
+ if (skb->len < 4)
+ goto out;
+
+ ptr = skb->data;
+ cb->services = *ptr++;
+ cb->info = *ptr++;
+ cb->segsize = dn_ntohs(*(__u16 *)ptr);
+
+ if ((scp->state == DN_CI) || (scp->state == DN_CD)) {
+ scp->persist = 0;
+ scp->addrrem = cb->src_port;
+ sk->sk_state = TCP_ESTABLISHED;
+ scp->state = DN_RUN;
+ scp->services_rem = cb->services;
+ scp->info_rem = cb->info;
+ scp->segsize_rem = cb->segsize;
+
+ if ((scp->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
+ scp->max_window = decnet_no_fc_max_cwnd;
+
+ if (skb->len > 0) {
+ unsigned char dlen = *skb->data;
+ if ((dlen <= 16) && (dlen <= skb->len)) {
+ scp->conndata_in.opt_optl = dlen;
+ memcpy(scp->conndata_in.opt_data, skb->data + 1, dlen);
+ }
+ }
+ dn_nsp_send_link(sk, DN_NOCHANGE, 0);
+ if (!sock_flag(sk, SOCK_DEAD))
+ sk->sk_state_change(sk);
+ }
+
+out:
+ kfree_skb(skb);
+}
+
+static void dn_nsp_conn_ack(struct sock *sk, struct sk_buff *skb)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ if (scp->state == DN_CI) {
+ scp->state = DN_CD;
+ scp->persist = 0;
+ }
+
+ kfree_skb(skb);
+}
+
+static void dn_nsp_disc_init(struct sock *sk, struct sk_buff *skb)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ unsigned short reason;
+
+ if (skb->len < 2)
+ goto out;
+
+ reason = dn_ntohs(*(__u16 *)skb->data);
+ skb_pull(skb, 2);
+
+ scp->discdata_in.opt_status = reason;
+ scp->discdata_in.opt_optl = 0;
+ memset(scp->discdata_in.opt_data, 0, 16);
+
+ if (skb->len > 0) {
+ unsigned char dlen = *skb->data;
+ if ((dlen <= 16) && (dlen <= skb->len)) {
+ scp->discdata_in.opt_optl = dlen;
+ memcpy(scp->discdata_in.opt_data, skb->data + 1, dlen);
+ }
+ }
+
+ scp->addrrem = cb->src_port;
+ sk->sk_state = TCP_CLOSE;
+
+ switch(scp->state) {
+ case DN_CI:
+ case DN_CD:
+ scp->state = DN_RJ;
+ sk->sk_err = ECONNREFUSED;
+ break;
+ case DN_RUN:
+ sk->sk_shutdown |= SHUTDOWN_MASK;
+ scp->state = DN_DN;
+ break;
+ case DN_DI:
+ scp->state = DN_DIC;
+ break;
+ }
+
+ if (!sock_flag(sk, SOCK_DEAD)) {
+ if (sk->sk_socket->state != SS_UNCONNECTED)
+ sk->sk_socket->state = SS_DISCONNECTING;
+ sk->sk_state_change(sk);
+ }
+
+ /*
+ * It appears that its possible for remote machines to send disc
+ * init messages with no port identifier if we are in the CI and
+ * possibly also the CD state. Obviously we shouldn't reply with
+ * a message if we don't know what the end point is.
+ */
+ if (scp->addrrem) {
+ dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
+ }
+ scp->persist_fxn = dn_destroy_timer;
+ scp->persist = dn_nsp_persist(sk);
+
+out:
+ kfree_skb(skb);
+}
+
+/*
+ * disc_conf messages are also called no_resources or no_link
+ * messages depending upon the "reason" field.
+ */
+static void dn_nsp_disc_conf(struct sock *sk, struct sk_buff *skb)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ unsigned short reason;
+
+ if (skb->len != 2)
+ goto out;
+
+ reason = dn_ntohs(*(__u16 *)skb->data);
+
+ sk->sk_state = TCP_CLOSE;
+
+ switch(scp->state) {
+ case DN_CI:
+ scp->state = DN_NR;
+ break;
+ case DN_DR:
+ if (reason == NSP_REASON_DC)
+ scp->state = DN_DRC;
+ if (reason == NSP_REASON_NL)
+ scp->state = DN_CN;
+ break;
+ case DN_DI:
+ scp->state = DN_DIC;
+ break;
+ case DN_RUN:
+ sk->sk_shutdown |= SHUTDOWN_MASK;
+ case DN_CC:
+ scp->state = DN_CN;
+ }
+
+ if (!sock_flag(sk, SOCK_DEAD)) {
+ if (sk->sk_socket->state != SS_UNCONNECTED)
+ sk->sk_socket->state = SS_DISCONNECTING;
+ sk->sk_state_change(sk);
+ }
+
+ scp->persist_fxn = dn_destroy_timer;
+ scp->persist = dn_nsp_persist(sk);
+
+out:
+ kfree_skb(skb);
+}
+
+static void dn_nsp_linkservice(struct sock *sk, struct sk_buff *skb)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ unsigned short segnum;
+ unsigned char lsflags;
+ signed char fcval;
+ int wake_up = 0;
+ char *ptr = skb->data;
+ unsigned char fctype = scp->services_rem & NSP_FC_MASK;
+
+ if (skb->len != 4)
+ goto out;
+
+ segnum = dn_ntohs(*(__u16 *)ptr);
+ ptr += 2;
+ lsflags = *(unsigned char *)ptr++;
+ fcval = *ptr;
+
+ /*
+ * Here we ignore erronous packets which should really
+ * should cause a connection abort. It is not critical
+ * for now though.
+ */
+ if (lsflags & 0xf8)
+ goto out;
+
+ if (seq_next(scp->numoth_rcv, segnum)) {
+ seq_add(&scp->numoth_rcv, 1);
+ switch(lsflags & 0x04) { /* FCVAL INT */
+ case 0x00: /* Normal Request */
+ switch(lsflags & 0x03) { /* FCVAL MOD */
+ case 0x00: /* Request count */
+ if (fcval < 0) {
+ unsigned char p_fcval = -fcval;
+ if ((scp->flowrem_dat > p_fcval) &&
+ (fctype == NSP_FC_SCMC)) {
+ scp->flowrem_dat -= p_fcval;
+ }
+ } else if (fcval > 0) {
+ scp->flowrem_dat += fcval;
+ wake_up = 1;
+ }
+ break;
+ case 0x01: /* Stop outgoing data */
+ scp->flowrem_sw = DN_DONTSEND;
+ break;
+ case 0x02: /* Ok to start again */
+ scp->flowrem_sw = DN_SEND;
+ dn_nsp_output(sk);
+ wake_up = 1;
+ }
+ break;
+ case 0x04: /* Interrupt Request */
+ if (fcval > 0) {
+ scp->flowrem_oth += fcval;
+ wake_up = 1;
+ }
+ break;
+ }
+ if (wake_up && !sock_flag(sk, SOCK_DEAD))
+ sk->sk_state_change(sk);
+ }
+
+ dn_nsp_send_oth_ack(sk);
+
+out:
+ kfree_skb(skb);
+}
+
+/*
+ * Copy of sock_queue_rcv_skb (from sock.h) without
+ * bh_lock_sock() (its already held when this is called) which
+ * also allows data and other data to be queued to a socket.
+ */
+static __inline__ int dn_queue_skb(struct sock *sk, struct sk_buff *skb, int sig, struct sk_buff_head *queue)
+{
+ int err;
+
+ /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
+ number of warnings when compiling with -W --ANK
+ */
+ if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
+ (unsigned)sk->sk_rcvbuf) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = sk_filter(sk, skb, 0);
+ if (err)
+ goto out;
+
+ skb_set_owner_r(skb, sk);
+ skb_queue_tail(queue, skb);
+
+ /* This code only runs from BH or BH protected context.
+ * Therefore the plain read_lock is ok here. -DaveM
+ */
+ read_lock(&sk->sk_callback_lock);
+ if (!sock_flag(sk, SOCK_DEAD)) {
+ struct socket *sock = sk->sk_socket;
+ wake_up_interruptible(sk->sk_sleep);
+ if (sock && sock->fasync_list &&
+ !test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
+ __kill_fasync(sock->fasync_list, sig,
+ (sig == SIGURG) ? POLL_PRI : POLL_IN);
+ }
+ read_unlock(&sk->sk_callback_lock);
+out:
+ return err;
+}
+
+static void dn_nsp_otherdata(struct sock *sk, struct sk_buff *skb)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ unsigned short segnum;
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ int queued = 0;
+
+ if (skb->len < 2)
+ goto out;
+
+ cb->segnum = segnum = dn_ntohs(*(__u16 *)skb->data);
+ skb_pull(skb, 2);
+
+ if (seq_next(scp->numoth_rcv, segnum)) {
+
+ if (dn_queue_skb(sk, skb, SIGURG, &scp->other_receive_queue) == 0) {
+ seq_add(&scp->numoth_rcv, 1);
+ scp->other_report = 0;
+ queued = 1;
+ }
+ }
+
+ dn_nsp_send_oth_ack(sk);
+out:
+ if (!queued)
+ kfree_skb(skb);
+}
+
+static void dn_nsp_data(struct sock *sk, struct sk_buff *skb)
+{
+ int queued = 0;
+ unsigned short segnum;
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct dn_scp *scp = DN_SK(sk);
+
+ if (skb->len < 2)
+ goto out;
+
+ cb->segnum = segnum = dn_ntohs(*(__u16 *)skb->data);
+ skb_pull(skb, 2);
+
+ if (seq_next(scp->numdat_rcv, segnum)) {
+ if (dn_queue_skb(sk, skb, SIGIO, &sk->sk_receive_queue) == 0) {
+ seq_add(&scp->numdat_rcv, 1);
+ queued = 1;
+ }
+
+ if ((scp->flowloc_sw == DN_SEND) && dn_congested(sk)) {
+ scp->flowloc_sw = DN_DONTSEND;
+ dn_nsp_send_link(sk, DN_DONTSEND, 0);
+ }
+ }
+
+ dn_nsp_send_data_ack(sk);
+out:
+ if (!queued)
+ kfree_skb(skb);
+}
+
+/*
+ * If one of our conninit messages is returned, this function
+ * deals with it. It puts the socket into the NO_COMMUNICATION
+ * state.
+ */
+static void dn_returned_conn_init(struct sock *sk, struct sk_buff *skb)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ if (scp->state == DN_CI) {
+ scp->state = DN_NC;
+ sk->sk_state = TCP_CLOSE;
+ if (!sock_flag(sk, SOCK_DEAD))
+ sk->sk_state_change(sk);
+ }
+
+ kfree_skb(skb);
+}
+
+static int dn_nsp_no_socket(struct sk_buff *skb, unsigned short reason)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ int ret = NET_RX_DROP;
+
+ /* Must not reply to returned packets */
+ if (cb->rt_flags & DN_RT_F_RTS)
+ goto out;
+
+ if ((reason != NSP_REASON_OK) && ((cb->nsp_flags & 0x0c) == 0x08)) {
+ switch(cb->nsp_flags & 0x70) {
+ case 0x10:
+ case 0x60: /* (Retransmitted) Connect Init */
+ dn_nsp_return_disc(skb, NSP_DISCINIT, reason);
+ ret = NET_RX_SUCCESS;
+ break;
+ case 0x20: /* Connect Confirm */
+ dn_nsp_return_disc(skb, NSP_DISCCONF, reason);
+ ret = NET_RX_SUCCESS;
+ break;
+ }
+ }
+
+out:
+ kfree_skb(skb);
+ return ret;
+}
+
+static int dn_nsp_rx_packet(struct sk_buff *skb)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct sock *sk = NULL;
+ unsigned char *ptr = (unsigned char *)skb->data;
+ unsigned short reason = NSP_REASON_NL;
+
+ if (!pskb_may_pull(skb, 2))
+ goto free_out;
+
+ skb->h.raw = skb->data;
+ cb->nsp_flags = *ptr++;
+
+ if (decnet_debug_level & 2)
+ printk(KERN_DEBUG "dn_nsp_rx: Message type 0x%02x\n", (int)cb->nsp_flags);
+
+ if (cb->nsp_flags & 0x83)
+ goto free_out;
+
+ /*
+ * Filter out conninits and useless packet types
+ */
+ if ((cb->nsp_flags & 0x0c) == 0x08) {
+ switch(cb->nsp_flags & 0x70) {
+ case 0x00: /* NOP */
+ case 0x70: /* Reserved */
+ case 0x50: /* Reserved, Phase II node init */
+ goto free_out;
+ case 0x10:
+ case 0x60:
+ if (unlikely(cb->rt_flags & DN_RT_F_RTS))
+ goto free_out;
+ sk = dn_find_listener(skb, &reason);
+ goto got_it;
+ }
+ }
+
+ if (!pskb_may_pull(skb, 3))
+ goto free_out;
+
+ /*
+ * Grab the destination address.
+ */
+ cb->dst_port = *(unsigned short *)ptr;
+ cb->src_port = 0;
+ ptr += 2;
+
+ /*
+ * If not a connack, grab the source address too.
+ */
+ if (pskb_may_pull(skb, 5)) {
+ cb->src_port = *(unsigned short *)ptr;
+ ptr += 2;
+ skb_pull(skb, 5);
+ }
+
+ /*
+ * Returned packets...
+ * Swap src & dst and look up in the normal way.
+ */
+ if (unlikely(cb->rt_flags & DN_RT_F_RTS)) {
+ unsigned short tmp = cb->dst_port;
+ cb->dst_port = cb->src_port;
+ cb->src_port = tmp;
+ tmp = cb->dst;
+ cb->dst = cb->src;
+ cb->src = tmp;
+ }
+
+ /*
+ * Find the socket to which this skb is destined.
+ */
+ sk = dn_find_by_skb(skb);
+got_it:
+ if (sk != NULL) {
+ struct dn_scp *scp = DN_SK(sk);
+ int ret;
+
+ /* Reset backoff */
+ scp->nsp_rxtshift = 0;
+
+ /*
+ * We linearize everything except data segments here.
+ */
+ if (cb->nsp_flags & ~0x60) {
+ if (unlikely(skb_is_nonlinear(skb)) &&
+ skb_linearize(skb, GFP_ATOMIC) != 0)
+ goto free_out;
+ }
+
+ bh_lock_sock(sk);
+ ret = NET_RX_SUCCESS;
+ if (decnet_debug_level & 8)
+ printk(KERN_DEBUG "NSP: 0x%02x 0x%02x 0x%04x 0x%04x %d\n",
+ (int)cb->rt_flags, (int)cb->nsp_flags,
+ (int)cb->src_port, (int)cb->dst_port,
+ !!sock_owned_by_user(sk));
+ if (!sock_owned_by_user(sk))
+ ret = dn_nsp_backlog_rcv(sk, skb);
+ else
+ sk_add_backlog(sk, skb);
+ bh_unlock_sock(sk);
+ sock_put(sk);
+
+ return ret;
+ }
+
+ return dn_nsp_no_socket(skb, reason);
+
+free_out:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+int dn_nsp_rx(struct sk_buff *skb)
+{
+ return NF_HOOK(PF_DECnet, NF_DN_LOCAL_IN, skb, skb->dev, NULL, dn_nsp_rx_packet);
+}
+
+/*
+ * This is the main receive routine for sockets. It is called
+ * from the above when the socket is not busy, and also from
+ * sock_release() when there is a backlog queued up.
+ */
+int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+
+ if (cb->rt_flags & DN_RT_F_RTS) {
+ if (cb->nsp_flags == 0x18 || cb->nsp_flags == 0x68)
+ dn_returned_conn_init(sk, skb);
+ else
+ kfree_skb(skb);
+ return NET_RX_SUCCESS;
+ }
+
+ /*
+ * Control packet.
+ */
+ if ((cb->nsp_flags & 0x0c) == 0x08) {
+ switch(cb->nsp_flags & 0x70) {
+ case 0x10:
+ case 0x60:
+ dn_nsp_conn_init(sk, skb);
+ break;
+ case 0x20:
+ dn_nsp_conn_conf(sk, skb);
+ break;
+ case 0x30:
+ dn_nsp_disc_init(sk, skb);
+ break;
+ case 0x40:
+ dn_nsp_disc_conf(sk, skb);
+ break;
+ }
+
+ } else if (cb->nsp_flags == 0x24) {
+ /*
+ * Special for connacks, 'cos they don't have
+ * ack data or ack otherdata info.
+ */
+ dn_nsp_conn_ack(sk, skb);
+ } else {
+ int other = 1;
+
+ /* both data and ack frames can kick a CC socket into RUN */
+ if ((scp->state == DN_CC) && !sock_flag(sk, SOCK_DEAD)) {
+ scp->state = DN_RUN;
+ sk->sk_state = TCP_ESTABLISHED;
+ sk->sk_state_change(sk);
+ }
+
+ if ((cb->nsp_flags & 0x1c) == 0)
+ other = 0;
+ if (cb->nsp_flags == 0x04)
+ other = 0;
+
+ /*
+ * Read out ack data here, this applies equally
+ * to data, other data, link serivce and both
+ * ack data and ack otherdata.
+ */
+ dn_process_ack(sk, skb, other);
+
+ /*
+ * If we've some sort of data here then call a
+ * suitable routine for dealing with it, otherwise
+ * the packet is an ack and can be discarded.
+ */
+ if ((cb->nsp_flags & 0x0c) == 0) {
+
+ if (scp->state != DN_RUN)
+ goto free_out;
+
+ switch(cb->nsp_flags) {
+ case 0x10: /* LS */
+ dn_nsp_linkservice(sk, skb);
+ break;
+ case 0x30: /* OD */
+ dn_nsp_otherdata(sk, skb);
+ break;
+ default:
+ dn_nsp_data(sk, skb);
+ }
+
+ } else { /* Ack, chuck it out here */
+free_out:
+ kfree_skb(skb);
+ }
+ }
+
+ return NET_RX_SUCCESS;
+}
+
diff --git a/net/decnet/dn_nsp_out.c b/net/decnet/dn_nsp_out.c
new file mode 100644
index 0000000..42abbf3
--- /dev/null
+++ b/net/decnet/dn_nsp_out.c
@@ -0,0 +1,782 @@
+
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Network Services Protocol (Output)
+ *
+ * Author: Eduardo Marcelo Serrat <emserrat@geocities.com>
+ *
+ * Changes:
+ *
+ * Steve Whitehouse: Split into dn_nsp_in.c and dn_nsp_out.c from
+ * original dn_nsp.c.
+ * Steve Whitehouse: Updated to work with my new routing architecture.
+ * Steve Whitehouse: Added changes from Eduardo Serrat's patches.
+ * Steve Whitehouse: Now conninits have the "return" bit set.
+ * Steve Whitehouse: Fixes to check alloc'd skbs are non NULL!
+ * Moved output state machine into one function
+ * Steve Whitehouse: New output state machine
+ * Paul Koning: Connect Confirm message fix.
+ * Eduardo Serrat: Fix to stop dn_nsp_do_disc() sending malformed packets.
+ * Steve Whitehouse: dn_nsp_output() and friends needed a spring clean
+ * Steve Whitehouse: Moved dn_nsp_send() in here from route.h
+ */
+
+/******************************************************************************
+ (c) 1995-1998 E.M. Serrat emserrat@geocities.com
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+*******************************************************************************/
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/inet.h>
+#include <linux/route.h>
+#include <net/sock.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/termios.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/if_packet.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_nsp.h>
+#include <net/dn_dev.h>
+#include <net/dn_route.h>
+
+
+static int nsp_backoff[NSP_MAXRXTSHIFT + 1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
+
+static void dn_nsp_send(struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+ struct dn_scp *scp = DN_SK(sk);
+ struct dst_entry *dst;
+ struct flowi fl;
+
+ skb->h.raw = skb->data;
+ scp->stamp = jiffies;
+
+ dst = sk_dst_check(sk, 0);
+ if (dst) {
+try_again:
+ skb->dst = dst;
+ dst_output(skb);
+ return;
+ }
+
+ memset(&fl, 0, sizeof(fl));
+ fl.oif = sk->sk_bound_dev_if;
+ fl.fld_src = dn_saddr2dn(&scp->addr);
+ fl.fld_dst = dn_saddr2dn(&scp->peer);
+ dn_sk_ports_copy(&fl, scp);
+ fl.proto = DNPROTO_NSP;
+ if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, 0) == 0) {
+ dst = sk_dst_get(sk);
+ sk->sk_route_caps = dst->dev->features;
+ goto try_again;
+ }
+
+ sk->sk_err = EHOSTUNREACH;
+ if (!sock_flag(sk, SOCK_DEAD))
+ sk->sk_state_change(sk);
+}
+
+
+/*
+ * If sk == NULL, then we assume that we are supposed to be making
+ * a routing layer skb. If sk != NULL, then we are supposed to be
+ * creating an skb for the NSP layer.
+ *
+ * The eventual aim is for each socket to have a cached header size
+ * for its outgoing packets, and to set hdr from this when sk != NULL.
+ */
+struct sk_buff *dn_alloc_skb(struct sock *sk, int size, int pri)
+{
+ struct sk_buff *skb;
+ int hdr = 64;
+
+ if ((skb = alloc_skb(size + hdr, pri)) == NULL)
+ return NULL;
+
+ skb->protocol = __constant_htons(ETH_P_DNA_RT);
+ skb->pkt_type = PACKET_OUTGOING;
+
+ if (sk)
+ skb_set_owner_w(skb, sk);
+
+ skb_reserve(skb, hdr);
+
+ return skb;
+}
+
+/*
+ * Wrapper for the above, for allocs of data skbs. We try and get the
+ * whole size thats been asked for (plus 11 bytes of header). If this
+ * fails, then we try for any size over 16 bytes for SOCK_STREAMS.
+ */
+struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, long timeo, int *err)
+{
+ int space;
+ int len;
+ struct sk_buff *skb = NULL;
+
+ *err = 0;
+
+ while(skb == NULL) {
+ if (signal_pending(current)) {
+ *err = sock_intr_errno(timeo);
+ break;
+ }
+
+ if (sk->sk_shutdown & SEND_SHUTDOWN) {
+ *err = EINVAL;
+ break;
+ }
+
+ if (sk->sk_err)
+ break;
+
+ len = *size + 11;
+ space = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
+
+ if (space < len) {
+ if ((sk->sk_socket->type == SOCK_STREAM) &&
+ (space >= (16 + 11)))
+ len = space;
+ }
+
+ if (space < len) {
+ set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+ if (noblock) {
+ *err = EWOULDBLOCK;
+ break;
+ }
+
+ clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
+ SOCK_SLEEP_PRE(sk)
+
+ if ((sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc)) <
+ len)
+ schedule();
+
+ SOCK_SLEEP_POST(sk)
+ continue;
+ }
+
+ if ((skb = dn_alloc_skb(sk, len, sk->sk_allocation)) == NULL)
+ continue;
+
+ *size = len - 11;
+ }
+
+ return skb;
+}
+
+/*
+ * Calculate persist timer based upon the smoothed round
+ * trip time and the variance. Backoff according to the
+ * nsp_backoff[] array.
+ */
+unsigned long dn_nsp_persist(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
+
+ t *= nsp_backoff[scp->nsp_rxtshift];
+
+ if (t < HZ) t = HZ;
+ if (t > (600*HZ)) t = (600*HZ);
+
+ if (scp->nsp_rxtshift < NSP_MAXRXTSHIFT)
+ scp->nsp_rxtshift++;
+
+ /* printk(KERN_DEBUG "rxtshift %lu, t=%lu\n", scp->nsp_rxtshift, t); */
+
+ return t;
+}
+
+/*
+ * This is called each time we get an estimate for the rtt
+ * on the link.
+ */
+static void dn_nsp_rtt(struct sock *sk, long rtt)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ long srtt = (long)scp->nsp_srtt;
+ long rttvar = (long)scp->nsp_rttvar;
+ long delta;
+
+ /*
+ * If the jiffies clock flips over in the middle of timestamp
+ * gathering this value might turn out negative, so we make sure
+ * that is it always positive here.
+ */
+ if (rtt < 0)
+ rtt = -rtt;
+ /*
+ * Add new rtt to smoothed average
+ */
+ delta = ((rtt << 3) - srtt);
+ srtt += (delta >> 3);
+ if (srtt >= 1)
+ scp->nsp_srtt = (unsigned long)srtt;
+ else
+ scp->nsp_srtt = 1;
+
+ /*
+ * Add new rtt varience to smoothed varience
+ */
+ delta >>= 1;
+ rttvar += ((((delta>0)?(delta):(-delta)) - rttvar) >> 2);
+ if (rttvar >= 1)
+ scp->nsp_rttvar = (unsigned long)rttvar;
+ else
+ scp->nsp_rttvar = 1;
+
+ /* printk(KERN_DEBUG "srtt=%lu rttvar=%lu\n", scp->nsp_srtt, scp->nsp_rttvar); */
+}
+
+/**
+ * dn_nsp_clone_and_send - Send a data packet by cloning it
+ * @skb: The packet to clone and transmit
+ * @gfp: memory allocation flag
+ *
+ * Clone a queued data or other data packet and transmit it.
+ *
+ * Returns: The number of times the packet has been sent previously
+ */
+static inline unsigned dn_nsp_clone_and_send(struct sk_buff *skb, int gfp)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct sk_buff *skb2;
+ int ret = 0;
+
+ if ((skb2 = skb_clone(skb, gfp)) != NULL) {
+ ret = cb->xmit_count;
+ cb->xmit_count++;
+ cb->stamp = jiffies;
+ skb2->sk = skb->sk;
+ dn_nsp_send(skb2);
+ }
+
+ return ret;
+}
+
+/**
+ * dn_nsp_output - Try and send something from socket queues
+ * @sk: The socket whose queues are to be investigated
+ * @gfp: The memory allocation flags
+ *
+ * Try and send the packet on the end of the data and other data queues.
+ * Other data gets priority over data, and if we retransmit a packet we
+ * reduce the window by dividing it in two.
+ *
+ */
+void dn_nsp_output(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct sk_buff *skb;
+ unsigned reduce_win = 0;
+
+ /*
+ * First we check for otherdata/linkservice messages
+ */
+ if ((skb = skb_peek(&scp->other_xmit_queue)) != NULL)
+ reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
+
+ /*
+ * If we may not send any data, we don't.
+ * If we are still trying to get some other data down the
+ * channel, we don't try and send any data.
+ */
+ if (reduce_win || (scp->flowrem_sw != DN_SEND))
+ goto recalc_window;
+
+ if ((skb = skb_peek(&scp->data_xmit_queue)) != NULL)
+ reduce_win = dn_nsp_clone_and_send(skb, GFP_ATOMIC);
+
+ /*
+ * If we've sent any frame more than once, we cut the
+ * send window size in half. There is always a minimum
+ * window size of one available.
+ */
+recalc_window:
+ if (reduce_win) {
+ scp->snd_window >>= 1;
+ if (scp->snd_window < NSP_MIN_WINDOW)
+ scp->snd_window = NSP_MIN_WINDOW;
+ }
+}
+
+int dn_nsp_xmit_timeout(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ dn_nsp_output(sk);
+
+ if (skb_queue_len(&scp->data_xmit_queue) || skb_queue_len(&scp->other_xmit_queue))
+ scp->persist = dn_nsp_persist(sk);
+
+ return 0;
+}
+
+static inline unsigned char *dn_mk_common_header(struct dn_scp *scp, struct sk_buff *skb, unsigned char msgflag, int len)
+{
+ unsigned char *ptr = skb_push(skb, len);
+
+ BUG_ON(len < 5);
+
+ *ptr++ = msgflag;
+ *((unsigned short *)ptr) = scp->addrrem;
+ ptr += 2;
+ *((unsigned short *)ptr) = scp->addrloc;
+ ptr += 2;
+ return ptr;
+}
+
+static unsigned short *dn_mk_ack_header(struct sock *sk, struct sk_buff *skb, unsigned char msgflag, int hlen, int other)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ unsigned short acknum = scp->numdat_rcv & 0x0FFF;
+ unsigned short ackcrs = scp->numoth_rcv & 0x0FFF;
+ unsigned short *ptr;
+
+ BUG_ON(hlen < 9);
+
+ scp->ackxmt_dat = acknum;
+ scp->ackxmt_oth = ackcrs;
+ acknum |= 0x8000;
+ ackcrs |= 0x8000;
+
+ /* If this is an "other data/ack" message, swap acknum and ackcrs */
+ if (other) {
+ unsigned short tmp = acknum;
+ acknum = ackcrs;
+ ackcrs = tmp;
+ }
+
+ /* Set "cross subchannel" bit in ackcrs */
+ ackcrs |= 0x2000;
+
+ ptr = (unsigned short *)dn_mk_common_header(scp, skb, msgflag, hlen);
+
+ *ptr++ = dn_htons(acknum);
+ *ptr++ = dn_htons(ackcrs);
+
+ return ptr;
+}
+
+static unsigned short *dn_nsp_mk_data_header(struct sock *sk, struct sk_buff *skb, int oth)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ unsigned short *ptr = dn_mk_ack_header(sk, skb, cb->nsp_flags, 11, oth);
+
+ if (unlikely(oth)) {
+ cb->segnum = scp->numoth;
+ seq_add(&scp->numoth, 1);
+ } else {
+ cb->segnum = scp->numdat;
+ seq_add(&scp->numdat, 1);
+ }
+ *(ptr++) = dn_htons(cb->segnum);
+
+ return ptr;
+}
+
+void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, int gfp, int oth)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ unsigned long t = ((scp->nsp_srtt >> 2) + scp->nsp_rttvar) >> 1;
+
+ cb->xmit_count = 0;
+ dn_nsp_mk_data_header(sk, skb, oth);
+
+ /*
+ * Slow start: If we have been idle for more than
+ * one RTT, then reset window to min size.
+ */
+ if ((jiffies - scp->stamp) > t)
+ scp->snd_window = NSP_MIN_WINDOW;
+
+ if (oth)
+ skb_queue_tail(&scp->other_xmit_queue, skb);
+ else
+ skb_queue_tail(&scp->data_xmit_queue, skb);
+
+ if (scp->flowrem_sw != DN_SEND)
+ return;
+
+ dn_nsp_clone_and_send(skb, gfp);
+}
+
+
+int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, struct sk_buff_head *q, unsigned short acknum)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct dn_scp *scp = DN_SK(sk);
+ struct sk_buff *skb2, *list, *ack = NULL;
+ int wakeup = 0;
+ int try_retrans = 0;
+ unsigned long reftime = cb->stamp;
+ unsigned long pkttime;
+ unsigned short xmit_count;
+ unsigned short segnum;
+
+ skb2 = q->next;
+ list = (struct sk_buff *)q;
+ while(list != skb2) {
+ struct dn_skb_cb *cb2 = DN_SKB_CB(skb2);
+
+ if (dn_before_or_equal(cb2->segnum, acknum))
+ ack = skb2;
+
+ /* printk(KERN_DEBUG "ack: %s %04x %04x\n", ack ? "ACK" : "SKIP", (int)cb2->segnum, (int)acknum); */
+
+ skb2 = skb2->next;
+
+ if (ack == NULL)
+ continue;
+
+ /* printk(KERN_DEBUG "check_xmit_queue: %04x, %d\n", acknum, cb2->xmit_count); */
+
+ /* Does _last_ packet acked have xmit_count > 1 */
+ try_retrans = 0;
+ /* Remember to wake up the sending process */
+ wakeup = 1;
+ /* Keep various statistics */
+ pkttime = cb2->stamp;
+ xmit_count = cb2->xmit_count;
+ segnum = cb2->segnum;
+ /* Remove and drop ack'ed packet */
+ skb_unlink(ack);
+ kfree_skb(ack);
+ ack = NULL;
+
+ /*
+ * We don't expect to see acknowledgements for packets we
+ * haven't sent yet.
+ */
+ WARN_ON(xmit_count == 0);
+
+ /*
+ * If the packet has only been sent once, we can use it
+ * to calculate the RTT and also open the window a little
+ * further.
+ */
+ if (xmit_count == 1) {
+ if (dn_equal(segnum, acknum))
+ dn_nsp_rtt(sk, (long)(pkttime - reftime));
+
+ if (scp->snd_window < scp->max_window)
+ scp->snd_window++;
+ }
+
+ /*
+ * Packet has been sent more than once. If this is the last
+ * packet to be acknowledged then we want to send the next
+ * packet in the send queue again (assumes the remote host does
+ * go-back-N error control).
+ */
+ if (xmit_count > 1)
+ try_retrans = 1;
+ }
+
+ if (try_retrans)
+ dn_nsp_output(sk);
+
+ return wakeup;
+}
+
+void dn_nsp_send_data_ack(struct sock *sk)
+{
+ struct sk_buff *skb = NULL;
+
+ if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
+ return;
+
+ skb_reserve(skb, 9);
+ dn_mk_ack_header(sk, skb, 0x04, 9, 0);
+ dn_nsp_send(skb);
+}
+
+void dn_nsp_send_oth_ack(struct sock *sk)
+{
+ struct sk_buff *skb = NULL;
+
+ if ((skb = dn_alloc_skb(sk, 9, GFP_ATOMIC)) == NULL)
+ return;
+
+ skb_reserve(skb, 9);
+ dn_mk_ack_header(sk, skb, 0x14, 9, 1);
+ dn_nsp_send(skb);
+}
+
+
+void dn_send_conn_ack (struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct sk_buff *skb = NULL;
+ struct nsp_conn_ack_msg *msg;
+
+ if ((skb = dn_alloc_skb(sk, 3, sk->sk_allocation)) == NULL)
+ return;
+
+ msg = (struct nsp_conn_ack_msg *)skb_put(skb, 3);
+ msg->msgflg = 0x24;
+ msg->dstaddr = scp->addrrem;
+
+ dn_nsp_send(skb);
+}
+
+void dn_nsp_delayed_ack(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ if (scp->ackxmt_oth != scp->numoth_rcv)
+ dn_nsp_send_oth_ack(sk);
+
+ if (scp->ackxmt_dat != scp->numdat_rcv)
+ dn_nsp_send_data_ack(sk);
+}
+
+static int dn_nsp_retrans_conn_conf(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ if (scp->state == DN_CC)
+ dn_send_conn_conf(sk, GFP_ATOMIC);
+
+ return 0;
+}
+
+void dn_send_conn_conf(struct sock *sk, int gfp)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct sk_buff *skb = NULL;
+ struct nsp_conn_init_msg *msg;
+ unsigned char len = scp->conndata_out.opt_optl;
+
+ if ((skb = dn_alloc_skb(sk, 50 + scp->conndata_out.opt_optl, gfp)) == NULL)
+ return;
+
+ msg = (struct nsp_conn_init_msg *)skb_put(skb, sizeof(*msg));
+ msg->msgflg = 0x28;
+ msg->dstaddr = scp->addrrem;
+ msg->srcaddr = scp->addrloc;
+ msg->services = scp->services_loc;
+ msg->info = scp->info_loc;
+ msg->segsize = dn_htons(scp->segsize_loc);
+
+ *skb_put(skb,1) = len;
+
+ if (len > 0)
+ memcpy(skb_put(skb, len), scp->conndata_out.opt_data, len);
+
+
+ dn_nsp_send(skb);
+
+ scp->persist = dn_nsp_persist(sk);
+ scp->persist_fxn = dn_nsp_retrans_conn_conf;
+}
+
+
+static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
+ unsigned short reason, int gfp, struct dst_entry *dst,
+ int ddl, unsigned char *dd, __u16 rem, __u16 loc)
+{
+ struct sk_buff *skb = NULL;
+ int size = 7 + ddl + ((msgflg == NSP_DISCINIT) ? 1 : 0);
+ unsigned char *msg;
+
+ if ((dst == NULL) || (rem == 0)) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "DECnet: dn_nsp_do_disc: BUG! Please report this to SteveW@ACM.org rem=%u dst=%p\n", (unsigned)rem, dst);
+ return;
+ }
+
+ if ((skb = dn_alloc_skb(sk, size, gfp)) == NULL)
+ return;
+
+ msg = skb_put(skb, size);
+ *msg++ = msgflg;
+ *(__u16 *)msg = rem;
+ msg += 2;
+ *(__u16 *)msg = loc;
+ msg += 2;
+ *(__u16 *)msg = dn_htons(reason);
+ msg += 2;
+ if (msgflg == NSP_DISCINIT)
+ *msg++ = ddl;
+
+ if (ddl) {
+ memcpy(msg, dd, ddl);
+ }
+
+ /*
+ * This doesn't go via the dn_nsp_send() function since we need
+ * to be able to send disc packets out which have no socket
+ * associations.
+ */
+ skb->dst = dst_clone(dst);
+ dst_output(skb);
+}
+
+
+void dn_nsp_send_disc(struct sock *sk, unsigned char msgflg,
+ unsigned short reason, int gfp)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ int ddl = 0;
+
+ if (msgflg == NSP_DISCINIT)
+ ddl = scp->discdata_out.opt_optl;
+
+ if (reason == 0)
+ reason = scp->discdata_out.opt_status;
+
+ dn_nsp_do_disc(sk, msgflg, reason, gfp, sk->sk_dst_cache, ddl,
+ scp->discdata_out.opt_data, scp->addrrem, scp->addrloc);
+}
+
+
+void dn_nsp_return_disc(struct sk_buff *skb, unsigned char msgflg,
+ unsigned short reason)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ int ddl = 0;
+ int gfp = GFP_ATOMIC;
+
+ dn_nsp_do_disc(NULL, msgflg, reason, gfp, skb->dst, ddl,
+ NULL, cb->src_port, cb->dst_port);
+}
+
+
+void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct sk_buff *skb;
+ unsigned char *ptr;
+ int gfp = GFP_ATOMIC;
+
+ if ((skb = dn_alloc_skb(sk, DN_MAX_NSP_DATA_HEADER + 2, gfp)) == NULL)
+ return;
+
+ skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
+ ptr = skb_put(skb, 2);
+ DN_SKB_CB(skb)->nsp_flags = 0x10;
+ *ptr++ = lsflags;
+ *ptr = fcval;
+
+ dn_nsp_queue_xmit(sk, skb, gfp, 1);
+
+ scp->persist = dn_nsp_persist(sk);
+ scp->persist_fxn = dn_nsp_xmit_timeout;
+}
+
+static int dn_nsp_retrans_conninit(struct sock *sk)
+{
+ struct dn_scp *scp = DN_SK(sk);
+
+ if (scp->state == DN_CI)
+ dn_nsp_send_conninit(sk, NSP_RCI);
+
+ return 0;
+}
+
+void dn_nsp_send_conninit(struct sock *sk, unsigned char msgflg)
+{
+ struct dn_scp *scp = DN_SK(sk);
+ struct nsp_conn_init_msg *msg;
+ unsigned char aux;
+ unsigned char menuver;
+ struct dn_skb_cb *cb;
+ unsigned char type = 1;
+ int allocation = (msgflg == NSP_CI) ? sk->sk_allocation : GFP_ATOMIC;
+ struct sk_buff *skb = dn_alloc_skb(sk, 200, allocation);
+
+ if (!skb)
+ return;
+
+ cb = DN_SKB_CB(skb);
+ msg = (struct nsp_conn_init_msg *)skb_put(skb,sizeof(*msg));
+
+ msg->msgflg = msgflg;
+ msg->dstaddr = 0x0000; /* Remote Node will assign it*/
+
+ msg->srcaddr = scp->addrloc;
+ msg->services = scp->services_loc; /* Requested flow control */
+ msg->info = scp->info_loc; /* Version Number */
+ msg->segsize = dn_htons(scp->segsize_loc); /* Max segment size */
+
+ if (scp->peer.sdn_objnum)
+ type = 0;
+
+ skb_put(skb, dn_sockaddr2username(&scp->peer, skb->tail, type));
+ skb_put(skb, dn_sockaddr2username(&scp->addr, skb->tail, 2));
+
+ menuver = DN_MENUVER_ACC | DN_MENUVER_USR;
+ if (scp->peer.sdn_flags & SDF_PROXY)
+ menuver |= DN_MENUVER_PRX;
+ if (scp->peer.sdn_flags & SDF_UICPROXY)
+ menuver |= DN_MENUVER_UIC;
+
+ *skb_put(skb, 1) = menuver; /* Menu Version */
+
+ aux = scp->accessdata.acc_userl;
+ *skb_put(skb, 1) = aux;
+ if (aux > 0)
+ memcpy(skb_put(skb, aux), scp->accessdata.acc_user, aux);
+
+ aux = scp->accessdata.acc_passl;
+ *skb_put(skb, 1) = aux;
+ if (aux > 0)
+ memcpy(skb_put(skb, aux), scp->accessdata.acc_pass, aux);
+
+ aux = scp->accessdata.acc_accl;
+ *skb_put(skb, 1) = aux;
+ if (aux > 0)
+ memcpy(skb_put(skb, aux), scp->accessdata.acc_acc, aux);
+
+ aux = scp->conndata_out.opt_optl;
+ *skb_put(skb, 1) = aux;
+ if (aux > 0)
+ memcpy(skb_put(skb,aux), scp->conndata_out.opt_data, aux);
+
+ scp->persist = dn_nsp_persist(sk);
+ scp->persist_fxn = dn_nsp_retrans_conninit;
+
+ cb->rt_flags = DN_RT_F_RQR;
+
+ dn_nsp_send(skb);
+}
+
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
new file mode 100644
index 0000000..1e7b5c3
--- /dev/null
+++ b/net/decnet/dn_route.c
@@ -0,0 +1,1840 @@
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Routing Functions (Endnode and Router)
+ *
+ * Authors: Steve Whitehouse <SteveW@ACM.org>
+ * Eduardo Marcelo Serrat <emserrat@geocities.com>
+ *
+ * Changes:
+ * Steve Whitehouse : Fixes to allow "intra-ethernet" and
+ * "return-to-sender" bits on outgoing
+ * packets.
+ * Steve Whitehouse : Timeouts for cached routes.
+ * Steve Whitehouse : Use dst cache for input routes too.
+ * Steve Whitehouse : Fixed error values in dn_send_skb.
+ * Steve Whitehouse : Rework routing functions to better fit
+ * DECnet routing design
+ * Alexey Kuznetsov : New SMP locking
+ * Steve Whitehouse : More SMP locking changes & dn_cache_dump()
+ * Steve Whitehouse : Prerouting NF hook, now really is prerouting.
+ * Fixed possible skb leak in rtnetlink funcs.
+ * Steve Whitehouse : Dave Miller's dynamic hash table sizing and
+ * Alexey Kuznetsov's finer grained locking
+ * from ipv4/route.c.
+ * Steve Whitehouse : Routing is now starting to look like a
+ * sensible set of code now, mainly due to
+ * my copying the IPv4 routing code. The
+ * hooks here are modified and will continue
+ * to evolve for a while.
+ * Steve Whitehouse : Real SMP at last :-) Also new netfilter
+ * stuff. Look out raw sockets your days
+ * are numbered!
+ * Steve Whitehouse : Added return-to-sender functions. Added
+ * backlog congestion level return codes.
+ * Steve Whitehouse : Fixed bug where routes were set up with
+ * no ref count on net devices.
+ * Steve Whitehouse : RCU for the route cache
+ * Steve Whitehouse : Preparations for the flow cache
+ * Steve Whitehouse : Prepare for nonlinear skbs
+ */
+
+/******************************************************************************
+ (c) 1995-1998 E.M. Serrat emserrat@geocities.com
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+*******************************************************************************/
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/inet.h>
+#include <linux/route.h>
+#include <linux/in_route.h>
+#include <net/sock.h>
+#include <linux/mm.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/rtnetlink.h>
+#include <linux/string.h>
+#include <linux/netfilter_decnet.h>
+#include <linux/rcupdate.h>
+#include <linux/times.h>
+#include <asm/errno.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_dev.h>
+#include <net/dn_nsp.h>
+#include <net/dn_route.h>
+#include <net/dn_neigh.h>
+#include <net/dn_fib.h>
+
+struct dn_rt_hash_bucket
+{
+ struct dn_route *chain;
+ spinlock_t lock;
+} __attribute__((__aligned__(8)));
+
+extern struct neigh_table dn_neigh_table;
+
+
+static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
+
+static const int dn_rt_min_delay = 2 * HZ;
+static const int dn_rt_max_delay = 10 * HZ;
+static const int dn_rt_mtu_expires = 10 * 60 * HZ;
+
+static unsigned long dn_rt_deadline;
+
+static int dn_dst_gc(void);
+static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
+static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
+static void dn_dst_link_failure(struct sk_buff *);
+static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);
+static int dn_route_input(struct sk_buff *);
+static void dn_run_flush(unsigned long dummy);
+
+static struct dn_rt_hash_bucket *dn_rt_hash_table;
+static unsigned dn_rt_hash_mask;
+
+static struct timer_list dn_route_timer;
+static struct timer_list dn_rt_flush_timer =
+ TIMER_INITIALIZER(dn_run_flush, 0, 0);
+int decnet_dst_gc_interval = 2;
+
+static struct dst_ops dn_dst_ops = {
+ .family = PF_DECnet,
+ .protocol = __constant_htons(ETH_P_DNA_RT),
+ .gc_thresh = 128,
+ .gc = dn_dst_gc,
+ .check = dn_dst_check,
+ .negative_advice = dn_dst_negative_advice,
+ .link_failure = dn_dst_link_failure,
+ .update_pmtu = dn_dst_update_pmtu,
+ .entry_size = sizeof(struct dn_route),
+ .entries = ATOMIC_INIT(0),
+};
+
+static __inline__ unsigned dn_hash(unsigned short src, unsigned short dst)
+{
+ unsigned short tmp = src ^ dst;
+ tmp ^= (tmp >> 3);
+ tmp ^= (tmp >> 5);
+ tmp ^= (tmp >> 10);
+ return dn_rt_hash_mask & (unsigned)tmp;
+}
+
+static inline void dnrt_free(struct dn_route *rt)
+{
+ call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
+}
+
+static inline void dnrt_drop(struct dn_route *rt)
+{
+ if (rt)
+ dst_release(&rt->u.dst);
+ call_rcu_bh(&rt->u.dst.rcu_head, dst_rcu_free);
+}
+
+static void dn_dst_check_expire(unsigned long dummy)
+{
+ int i;
+ struct dn_route *rt, **rtp;
+ unsigned long now = jiffies;
+ unsigned long expire = 120 * HZ;
+
+ for(i = 0; i <= dn_rt_hash_mask; i++) {
+ rtp = &dn_rt_hash_table[i].chain;
+
+ spin_lock(&dn_rt_hash_table[i].lock);
+ while((rt=*rtp) != NULL) {
+ if (atomic_read(&rt->u.dst.__refcnt) ||
+ (now - rt->u.dst.lastuse) < expire) {
+ rtp = &rt->u.rt_next;
+ continue;
+ }
+ *rtp = rt->u.rt_next;
+ rt->u.rt_next = NULL;
+ dnrt_free(rt);
+ }
+ spin_unlock(&dn_rt_hash_table[i].lock);
+
+ if ((jiffies - now) > 0)
+ break;
+ }
+
+ mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
+}
+
+static int dn_dst_gc(void)
+{
+ struct dn_route *rt, **rtp;
+ int i;
+ unsigned long now = jiffies;
+ unsigned long expire = 10 * HZ;
+
+ for(i = 0; i <= dn_rt_hash_mask; i++) {
+
+ spin_lock_bh(&dn_rt_hash_table[i].lock);
+ rtp = &dn_rt_hash_table[i].chain;
+
+ while((rt=*rtp) != NULL) {
+ if (atomic_read(&rt->u.dst.__refcnt) ||
+ (now - rt->u.dst.lastuse) < expire) {
+ rtp = &rt->u.rt_next;
+ continue;
+ }
+ *rtp = rt->u.rt_next;
+ rt->u.rt_next = NULL;
+ dnrt_drop(rt);
+ break;
+ }
+ spin_unlock_bh(&dn_rt_hash_table[i].lock);
+ }
+
+ return 0;
+}
+
+/*
+ * The decnet standards don't impose a particular minimum mtu, what they
+ * do insist on is that the routing layer accepts a datagram of at least
+ * 230 bytes long. Here we have to subtract the routing header length from
+ * 230 to get the minimum acceptable mtu. If there is no neighbour, then we
+ * assume the worst and use a long header size.
+ *
+ * We update both the mtu and the advertised mss (i.e. the segment size we
+ * advertise to the other end).
+ */
+static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu)
+{
+ u32 min_mtu = 230;
+ struct dn_dev *dn = dst->neighbour ?
+ (struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL;
+
+ if (dn && dn->use_long == 0)
+ min_mtu -= 6;
+ else
+ min_mtu -= 21;
+
+ if (dst->metrics[RTAX_MTU-1] > mtu && mtu >= min_mtu) {
+ if (!(dst_metric_locked(dst, RTAX_MTU))) {
+ dst->metrics[RTAX_MTU-1] = mtu;
+ dst_set_expires(dst, dn_rt_mtu_expires);
+ }
+ if (!(dst_metric_locked(dst, RTAX_ADVMSS))) {
+ u32 mss = mtu - DN_MAX_NSP_DATA_HEADER;
+ if (dst->metrics[RTAX_ADVMSS-1] > mss)
+ dst->metrics[RTAX_ADVMSS-1] = mss;
+ }
+ }
+}
+
+/*
+ * When a route has been marked obsolete. (e.g. routing cache flush)
+ */
+static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
+{
+ return NULL;
+}
+
+static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
+{
+ dst_release(dst);
+ return NULL;
+}
+
+static void dn_dst_link_failure(struct sk_buff *skb)
+{
+ return;
+}
+
+static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
+{
+ return memcmp(&fl1->nl_u.dn_u, &fl2->nl_u.dn_u, sizeof(fl1->nl_u.dn_u)) == 0 &&
+ fl1->oif == fl2->oif &&
+ fl1->iif == fl2->iif;
+}
+
+static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp)
+{
+ struct dn_route *rth, **rthp;
+ unsigned long now = jiffies;
+
+ rthp = &dn_rt_hash_table[hash].chain;
+
+ spin_lock_bh(&dn_rt_hash_table[hash].lock);
+ while((rth = *rthp) != NULL) {
+ if (compare_keys(&rth->fl, &rt->fl)) {
+ /* Put it first */
+ *rthp = rth->u.rt_next;
+ rcu_assign_pointer(rth->u.rt_next,
+ dn_rt_hash_table[hash].chain);
+ rcu_assign_pointer(dn_rt_hash_table[hash].chain, rth);
+
+ rth->u.dst.__use++;
+ dst_hold(&rth->u.dst);
+ rth->u.dst.lastuse = now;
+ spin_unlock_bh(&dn_rt_hash_table[hash].lock);
+
+ dnrt_drop(rt);
+ *rp = rth;
+ return 0;
+ }
+ rthp = &rth->u.rt_next;
+ }
+
+ rcu_assign_pointer(rt->u.rt_next, dn_rt_hash_table[hash].chain);
+ rcu_assign_pointer(dn_rt_hash_table[hash].chain, rt);
+
+ dst_hold(&rt->u.dst);
+ rt->u.dst.__use++;
+ rt->u.dst.lastuse = now;
+ spin_unlock_bh(&dn_rt_hash_table[hash].lock);
+ *rp = rt;
+ return 0;
+}
+
+void dn_run_flush(unsigned long dummy)
+{
+ int i;
+ struct dn_route *rt, *next;
+
+ for(i = 0; i < dn_rt_hash_mask; i++) {
+ spin_lock_bh(&dn_rt_hash_table[i].lock);
+
+ if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL)
+ goto nothing_to_declare;
+
+ for(; rt; rt=next) {
+ next = rt->u.rt_next;
+ rt->u.rt_next = NULL;
+ dst_free((struct dst_entry *)rt);
+ }
+
+nothing_to_declare:
+ spin_unlock_bh(&dn_rt_hash_table[i].lock);
+ }
+}
+
+static DEFINE_SPINLOCK(dn_rt_flush_lock);
+
+void dn_rt_cache_flush(int delay)
+{
+ unsigned long now = jiffies;
+ int user_mode = !in_interrupt();
+
+ if (delay < 0)
+ delay = dn_rt_min_delay;
+
+ spin_lock_bh(&dn_rt_flush_lock);
+
+ if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
+ long tmo = (long)(dn_rt_deadline - now);
+
+ if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
+ tmo = 0;
+
+ if (delay > tmo)
+ delay = tmo;
+ }
+
+ if (delay <= 0) {
+ spin_unlock_bh(&dn_rt_flush_lock);
+ dn_run_flush(0);
+ return;
+ }
+
+ if (dn_rt_deadline == 0)
+ dn_rt_deadline = now + dn_rt_max_delay;
+
+ dn_rt_flush_timer.expires = now + delay;
+ add_timer(&dn_rt_flush_timer);
+ spin_unlock_bh(&dn_rt_flush_lock);
+}
+
+/**
+ * dn_return_short - Return a short packet to its sender
+ * @skb: The packet to return
+ *
+ */
+static int dn_return_short(struct sk_buff *skb)
+{
+ struct dn_skb_cb *cb;
+ unsigned char *ptr;
+ dn_address *src;
+ dn_address *dst;
+ dn_address tmp;
+
+ /* Add back headers */
+ skb_push(skb, skb->data - skb->nh.raw);
+
+ if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
+ return NET_RX_DROP;
+
+ cb = DN_SKB_CB(skb);
+ /* Skip packet length and point to flags */
+ ptr = skb->data + 2;
+ *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
+
+ dst = (dn_address *)ptr;
+ ptr += 2;
+ src = (dn_address *)ptr;
+ ptr += 2;
+ *ptr = 0; /* Zero hop count */
+
+ /* Swap source and destination */
+ tmp = *src;
+ *src = *dst;
+ *dst = tmp;
+
+ skb->pkt_type = PACKET_OUTGOING;
+ dn_rt_finish_output(skb, NULL, NULL);
+ return NET_RX_SUCCESS;
+}
+
+/**
+ * dn_return_long - Return a long packet to its sender
+ * @skb: The long format packet to return
+ *
+ */
+static int dn_return_long(struct sk_buff *skb)
+{
+ struct dn_skb_cb *cb;
+ unsigned char *ptr;
+ unsigned char *src_addr, *dst_addr;
+ unsigned char tmp[ETH_ALEN];
+
+ /* Add back all headers */
+ skb_push(skb, skb->data - skb->nh.raw);
+
+ if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
+ return NET_RX_DROP;
+
+ cb = DN_SKB_CB(skb);
+ /* Ignore packet length and point to flags */
+ ptr = skb->data + 2;
+
+ /* Skip padding */
+ if (*ptr & DN_RT_F_PF) {
+ char padlen = (*ptr & ~DN_RT_F_PF);
+ ptr += padlen;
+ }
+
+ *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
+ ptr += 2;
+ dst_addr = ptr;
+ ptr += 8;
+ src_addr = ptr;
+ ptr += 6;
+ *ptr = 0; /* Zero hop count */
+
+ /* Swap source and destination */
+ memcpy(tmp, src_addr, ETH_ALEN);
+ memcpy(src_addr, dst_addr, ETH_ALEN);
+ memcpy(dst_addr, tmp, ETH_ALEN);
+
+ skb->pkt_type = PACKET_OUTGOING;
+ dn_rt_finish_output(skb, dst_addr, src_addr);
+ return NET_RX_SUCCESS;
+}
+
+/**
+ * dn_route_rx_packet - Try and find a route for an incoming packet
+ * @skb: The packet to find a route for
+ *
+ * Returns: result of input function if route is found, error code otherwise
+ */
+static int dn_route_rx_packet(struct sk_buff *skb)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ int err;
+
+ if ((err = dn_route_input(skb)) == 0)
+ return dst_input(skb);
+
+ if (decnet_debug_level & 4) {
+ char *devname = skb->dev ? skb->dev->name : "???";
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ printk(KERN_DEBUG
+ "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
+ (int)cb->rt_flags, devname, skb->len, cb->src, cb->dst,
+ err, skb->pkt_type);
+ }
+
+ if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
+ switch(cb->rt_flags & DN_RT_PKT_MSK) {
+ case DN_RT_PKT_SHORT:
+ return dn_return_short(skb);
+ case DN_RT_PKT_LONG:
+ return dn_return_long(skb);
+ }
+ }
+
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+static int dn_route_rx_long(struct sk_buff *skb)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ unsigned char *ptr = skb->data;
+
+ if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */
+ goto drop_it;
+
+ skb_pull(skb, 20);
+ skb->h.raw = skb->data;
+
+ /* Destination info */
+ ptr += 2;
+ cb->dst = dn_htons(dn_eth2dn(ptr));
+ if (memcmp(ptr, dn_hiord_addr, 4) != 0)
+ goto drop_it;
+ ptr += 6;
+
+
+ /* Source info */
+ ptr += 2;
+ cb->src = dn_htons(dn_eth2dn(ptr));
+ if (memcmp(ptr, dn_hiord_addr, 4) != 0)
+ goto drop_it;
+ ptr += 6;
+ /* Other junk */
+ ptr++;
+ cb->hops = *ptr++; /* Visit Count */
+
+ return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
+
+drop_it:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+
+
+static int dn_route_rx_short(struct sk_buff *skb)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ unsigned char *ptr = skb->data;
+
+ if (!pskb_may_pull(skb, 6)) /* 5 for short header + 1 for shortest nsp */
+ goto drop_it;
+
+ skb_pull(skb, 5);
+ skb->h.raw = skb->data;
+
+ cb->dst = *(dn_address *)ptr;
+ ptr += 2;
+ cb->src = *(dn_address *)ptr;
+ ptr += 2;
+ cb->hops = *ptr & 0x3f;
+
+ return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
+
+drop_it:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+static int dn_route_discard(struct sk_buff *skb)
+{
+ /*
+ * I know we drop the packet here, but thats considered success in
+ * this case
+ */
+ kfree_skb(skb);
+ return NET_RX_SUCCESS;
+}
+
+static int dn_route_ptp_hello(struct sk_buff *skb)
+{
+ dn_dev_hello(skb);
+ dn_neigh_pointopoint_hello(skb);
+ return NET_RX_SUCCESS;
+}
+
+int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
+{
+ struct dn_skb_cb *cb;
+ unsigned char flags = 0;
+ __u16 len = dn_ntohs(*(__u16 *)skb->data);
+ struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr;
+ unsigned char padlen = 0;
+
+ if (dn == NULL)
+ goto dump_it;
+
+ if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
+ goto out;
+
+ if (!pskb_may_pull(skb, 3))
+ goto dump_it;
+
+ skb_pull(skb, 2);
+
+ if (len > skb->len)
+ goto dump_it;
+
+ skb_trim(skb, len);
+
+ flags = *skb->data;
+
+ cb = DN_SKB_CB(skb);
+ cb->stamp = jiffies;
+ cb->iif = dev->ifindex;
+
+ /*
+ * If we have padding, remove it.
+ */
+ if (flags & DN_RT_F_PF) {
+ padlen = flags & ~DN_RT_F_PF;
+ if (!pskb_may_pull(skb, padlen + 1))
+ goto dump_it;
+ skb_pull(skb, padlen);
+ flags = *skb->data;
+ }
+
+ skb->nh.raw = skb->data;
+
+ /*
+ * Weed out future version DECnet
+ */
+ if (flags & DN_RT_F_VER)
+ goto dump_it;
+
+ cb->rt_flags = flags;
+
+ if (decnet_debug_level & 1)
+ printk(KERN_DEBUG
+ "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
+ (int)flags, (dev) ? dev->name : "???", len, skb->len,
+ padlen);
+
+ if (flags & DN_RT_PKT_CNTL) {
+ if (unlikely(skb_is_nonlinear(skb)) &&
+ skb_linearize(skb, GFP_ATOMIC) != 0)
+ goto dump_it;
+
+ switch(flags & DN_RT_CNTL_MSK) {
+ case DN_RT_PKT_INIT:
+ dn_dev_init_pkt(skb);
+ break;
+ case DN_RT_PKT_VERI:
+ dn_dev_veri_pkt(skb);
+ break;
+ }
+
+ if (dn->parms.state != DN_DEV_S_RU)
+ goto dump_it;
+
+ switch(flags & DN_RT_CNTL_MSK) {
+ case DN_RT_PKT_HELO:
+ return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello);
+
+ case DN_RT_PKT_L1RT:
+ case DN_RT_PKT_L2RT:
+ return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard);
+ case DN_RT_PKT_ERTH:
+ return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello);
+
+ case DN_RT_PKT_EEDH:
+ return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello);
+ }
+ } else {
+ if (dn->parms.state != DN_DEV_S_RU)
+ goto dump_it;
+
+ skb_pull(skb, 1); /* Pull flags */
+
+ switch(flags & DN_RT_PKT_MSK) {
+ case DN_RT_PKT_LONG:
+ return dn_route_rx_long(skb);
+ case DN_RT_PKT_SHORT:
+ return dn_route_rx_short(skb);
+ }
+ }
+
+dump_it:
+ kfree_skb(skb);
+out:
+ return NET_RX_DROP;
+}
+
+static int dn_output(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb->dst;
+ struct dn_route *rt = (struct dn_route *)dst;
+ struct net_device *dev = dst->dev;
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct neighbour *neigh;
+
+ int err = -EINVAL;
+
+ if ((neigh = dst->neighbour) == NULL)
+ goto error;
+
+ skb->dev = dev;
+
+ cb->src = rt->rt_saddr;
+ cb->dst = rt->rt_daddr;
+
+ /*
+ * Always set the Intra-Ethernet bit on all outgoing packets
+ * originated on this node. Only valid flag from upper layers
+ * is return-to-sender-requested. Set hop count to 0 too.
+ */
+ cb->rt_flags &= ~DN_RT_F_RQR;
+ cb->rt_flags |= DN_RT_F_IE;
+ cb->hops = 0;
+
+ return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output);
+
+error:
+ if (net_ratelimit())
+ printk(KERN_DEBUG "dn_output: This should not happen\n");
+
+ kfree_skb(skb);
+
+ return err;
+}
+
+static int dn_forward(struct sk_buff *skb)
+{
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct dst_entry *dst = skb->dst;
+ struct dn_dev *dn_db = dst->dev->dn_ptr;
+ struct dn_route *rt;
+ struct neighbour *neigh = dst->neighbour;
+ int header_len;
+#ifdef CONFIG_NETFILTER
+ struct net_device *dev = skb->dev;
+#endif
+
+ if (skb->pkt_type != PACKET_HOST)
+ goto drop;
+
+ /* Ensure that we have enough space for headers */
+ rt = (struct dn_route *)skb->dst;
+ header_len = dn_db->use_long ? 21 : 6;
+ if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+header_len))
+ goto drop;
+
+ /*
+ * Hop count exceeded.
+ */
+ if (++cb->hops > 30)
+ goto drop;
+
+ skb->dev = rt->u.dst.dev;
+
+ /*
+ * If packet goes out same interface it came in on, then set
+ * the Intra-Ethernet bit. This has no effect for short
+ * packets, so we don't need to test for them here.
+ */
+ cb->rt_flags &= ~DN_RT_F_IE;
+ if (rt->rt_flags & RTCF_DOREDIRECT)
+ cb->rt_flags |= DN_RT_F_IE;
+
+ return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output);
+
+drop:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+/*
+ * Drop packet. This is used for endnodes and for
+ * when we should not be forwarding packets from
+ * this dest.
+ */
+static int dn_blackhole(struct sk_buff *skb)
+{
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+/*
+ * Used to catch bugs. This should never normally get
+ * called.
+ */
+static int dn_rt_bug(struct sk_buff *skb)
+{
+ if (net_ratelimit()) {
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+
+ printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n",
+ cb->src, cb->dst);
+ }
+
+ kfree_skb(skb);
+
+ return NET_RX_BAD;
+}
+
+static int dn_rt_set_next_hop(struct dn_route *rt, struct dn_fib_res *res)
+{
+ struct dn_fib_info *fi = res->fi;
+ struct net_device *dev = rt->u.dst.dev;
+ struct neighbour *n;
+ unsigned mss;
+
+ if (fi) {
+ if (DN_FIB_RES_GW(*res) &&
+ DN_FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
+ rt->rt_gateway = DN_FIB_RES_GW(*res);
+ memcpy(rt->u.dst.metrics, fi->fib_metrics,
+ sizeof(rt->u.dst.metrics));
+ }
+ rt->rt_type = res->type;
+
+ if (dev != NULL && rt->u.dst.neighbour == NULL) {
+ n = __neigh_lookup_errno(&dn_neigh_table, &rt->rt_gateway, dev);
+ if (IS_ERR(n))
+ return PTR_ERR(n);
+ rt->u.dst.neighbour = n;
+ }
+
+ if (rt->u.dst.metrics[RTAX_MTU-1] == 0 ||
+ rt->u.dst.metrics[RTAX_MTU-1] > rt->u.dst.dev->mtu)
+ rt->u.dst.metrics[RTAX_MTU-1] = rt->u.dst.dev->mtu;
+ mss = dn_mss_from_pmtu(dev, dst_mtu(&rt->u.dst));
+ if (rt->u.dst.metrics[RTAX_ADVMSS-1] == 0 ||
+ rt->u.dst.metrics[RTAX_ADVMSS-1] > mss)
+ rt->u.dst.metrics[RTAX_ADVMSS-1] = mss;
+ return 0;
+}
+
+static inline int dn_match_addr(__u16 addr1, __u16 addr2)
+{
+ __u16 tmp = dn_ntohs(addr1) ^ dn_ntohs(addr2);
+ int match = 16;
+ while(tmp) {
+ tmp >>= 1;
+ match--;
+ }
+ return match;
+}
+
+static __u16 dnet_select_source(const struct net_device *dev, __u16 daddr, int scope)
+{
+ __u16 saddr = 0;
+ struct dn_dev *dn_db = dev->dn_ptr;
+ struct dn_ifaddr *ifa;
+ int best_match = 0;
+ int ret;
+
+ read_lock(&dev_base_lock);
+ for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
+ if (ifa->ifa_scope > scope)
+ continue;
+ if (!daddr) {
+ saddr = ifa->ifa_local;
+ break;
+ }
+ ret = dn_match_addr(daddr, ifa->ifa_local);
+ if (ret > best_match)
+ saddr = ifa->ifa_local;
+ if (best_match == 0)
+ saddr = ifa->ifa_local;
+ }
+ read_unlock(&dev_base_lock);
+
+ return saddr;
+}
+
+static inline __u16 __dn_fib_res_prefsrc(struct dn_fib_res *res)
+{
+ return dnet_select_source(DN_FIB_RES_DEV(*res), DN_FIB_RES_GW(*res), res->scope);
+}
+
+static inline __u16 dn_fib_rules_map_destination(__u16 daddr, struct dn_fib_res *res)
+{
+ __u16 mask = dnet_make_mask(res->prefixlen);
+ return (daddr&~mask)|res->fi->fib_nh->nh_gw;
+}
+
+static int dn_route_output_slow(struct dst_entry **pprt, const struct flowi *oldflp, int try_hard)
+{
+ struct flowi fl = { .nl_u = { .dn_u =
+ { .daddr = oldflp->fld_dst,
+ .saddr = oldflp->fld_src,
+ .scope = RT_SCOPE_UNIVERSE,
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ .fwmark = oldflp->fld_fwmark
+#endif
+ } },
+ .iif = loopback_dev.ifindex,
+ .oif = oldflp->oif };
+ struct dn_route *rt = NULL;
+ struct net_device *dev_out = NULL;
+ struct neighbour *neigh = NULL;
+ unsigned hash;
+ unsigned flags = 0;
+ struct dn_fib_res res = { .fi = NULL, .type = RTN_UNICAST };
+ int err;
+ int free_res = 0;
+ __u16 gateway = 0;
+
+ if (decnet_debug_level & 16)
+ printk(KERN_DEBUG
+ "dn_route_output_slow: dst=%04x src=%04x mark=%d"
+ " iif=%d oif=%d\n", oldflp->fld_dst, oldflp->fld_src,
+ oldflp->fld_fwmark, loopback_dev.ifindex, oldflp->oif);
+
+ /* If we have an output interface, verify its a DECnet device */
+ if (oldflp->oif) {
+ dev_out = dev_get_by_index(oldflp->oif);
+ err = -ENODEV;
+ if (dev_out && dev_out->dn_ptr == NULL) {
+ dev_put(dev_out);
+ dev_out = NULL;
+ }
+ if (dev_out == NULL)
+ goto out;
+ }
+
+ /* If we have a source address, verify that its a local address */
+ if (oldflp->fld_src) {
+ err = -EADDRNOTAVAIL;
+
+ if (dev_out) {
+ if (dn_dev_islocal(dev_out, oldflp->fld_src))
+ goto source_ok;
+ dev_put(dev_out);
+ goto out;
+ }
+ read_lock(&dev_base_lock);
+ for(dev_out = dev_base; dev_out; dev_out = dev_out->next) {
+ if (!dev_out->dn_ptr)
+ continue;
+ if (dn_dev_islocal(dev_out, oldflp->fld_src))
+ break;
+ }
+ read_unlock(&dev_base_lock);
+ if (dev_out == NULL)
+ goto out;
+ dev_hold(dev_out);
+source_ok:
+ ;
+ }
+
+ /* No destination? Assume its local */
+ if (!fl.fld_dst) {
+ fl.fld_dst = fl.fld_src;
+
+ err = -EADDRNOTAVAIL;
+ if (dev_out)
+ dev_put(dev_out);
+ dev_out = &loopback_dev;
+ dev_hold(dev_out);
+ if (!fl.fld_dst) {
+ fl.fld_dst =
+ fl.fld_src = dnet_select_source(dev_out, 0,
+ RT_SCOPE_HOST);
+ if (!fl.fld_dst)
+ goto out;
+ }
+ fl.oif = loopback_dev.ifindex;
+ res.type = RTN_LOCAL;
+ goto make_route;
+ }
+
+ if (decnet_debug_level & 16)
+ printk(KERN_DEBUG
+ "dn_route_output_slow: initial checks complete."
+ " dst=%o4x src=%04x oif=%d try_hard=%d\n", fl.fld_dst,
+ fl.fld_src, fl.oif, try_hard);
+
+ /*
+ * N.B. If the kernel is compiled without router support then
+ * dn_fib_lookup() will evaluate to non-zero so this if () block
+ * will always be executed.
+ */
+ err = -ESRCH;
+ if (try_hard || (err = dn_fib_lookup(&fl, &res)) != 0) {
+ struct dn_dev *dn_db;
+ if (err != -ESRCH)
+ goto out;
+ /*
+ * Here the fallback is basically the standard algorithm for
+ * routing in endnodes which is described in the DECnet routing
+ * docs
+ *
+ * If we are not trying hard, look in neighbour cache.
+ * The result is tested to ensure that if a specific output
+ * device/source address was requested, then we honour that
+ * here
+ */
+ if (!try_hard) {
+ neigh = neigh_lookup_nodev(&dn_neigh_table, &fl.fld_dst);
+ if (neigh) {
+ if ((oldflp->oif &&
+ (neigh->dev->ifindex != oldflp->oif)) ||
+ (oldflp->fld_src &&
+ (!dn_dev_islocal(neigh->dev,
+ oldflp->fld_src)))) {
+ neigh_release(neigh);
+ neigh = NULL;
+ } else {
+ if (dev_out)
+ dev_put(dev_out);
+ if (dn_dev_islocal(neigh->dev, fl.fld_dst)) {
+ dev_out = &loopback_dev;
+ res.type = RTN_LOCAL;
+ } else {
+ dev_out = neigh->dev;
+ }
+ dev_hold(dev_out);
+ goto select_source;
+ }
+ }
+ }
+
+ /* Not there? Perhaps its a local address */
+ if (dev_out == NULL)
+ dev_out = dn_dev_get_default();
+ err = -ENODEV;
+ if (dev_out == NULL)
+ goto out;
+ dn_db = dev_out->dn_ptr;
+ /* Possible improvement - check all devices for local addr */
+ if (dn_dev_islocal(dev_out, fl.fld_dst)) {
+ dev_put(dev_out);
+ dev_out = &loopback_dev;
+ dev_hold(dev_out);
+ res.type = RTN_LOCAL;
+ goto select_source;
+ }
+ /* Not local either.... try sending it to the default router */
+ neigh = neigh_clone(dn_db->router);
+ BUG_ON(neigh && neigh->dev != dev_out);
+
+ /* Ok then, we assume its directly connected and move on */
+select_source:
+ if (neigh)
+ gateway = ((struct dn_neigh *)neigh)->addr;
+ if (gateway == 0)
+ gateway = fl.fld_dst;
+ if (fl.fld_src == 0) {
+ fl.fld_src = dnet_select_source(dev_out, gateway,
+ res.type == RTN_LOCAL ?
+ RT_SCOPE_HOST :
+ RT_SCOPE_LINK);
+ if (fl.fld_src == 0 && res.type != RTN_LOCAL)
+ goto e_addr;
+ }
+ fl.oif = dev_out->ifindex;
+ goto make_route;
+ }
+ free_res = 1;
+
+ if (res.type == RTN_NAT)
+ goto e_inval;
+
+ if (res.type == RTN_LOCAL) {
+ if (!fl.fld_src)
+ fl.fld_src = fl.fld_dst;
+ if (dev_out)
+ dev_put(dev_out);
+ dev_out = &loopback_dev;
+ dev_hold(dev_out);
+ fl.oif = dev_out->ifindex;
+ if (res.fi)
+ dn_fib_info_put(res.fi);
+ res.fi = NULL;
+ goto make_route;
+ }
+
+ if (res.fi->fib_nhs > 1 && fl.oif == 0)
+ dn_fib_select_multipath(&fl, &res);
+
+ /*
+ * We could add some logic to deal with default routes here and
+ * get rid of some of the special casing above.
+ */
+
+ if (!fl.fld_src)
+ fl.fld_src = DN_FIB_RES_PREFSRC(res);
+
+ if (dev_out)
+ dev_put(dev_out);
+ dev_out = DN_FIB_RES_DEV(res);
+ dev_hold(dev_out);
+ fl.oif = dev_out->ifindex;
+ gateway = DN_FIB_RES_GW(res);
+
+make_route:
+ if (dev_out->flags & IFF_LOOPBACK)
+ flags |= RTCF_LOCAL;
+
+ rt = dst_alloc(&dn_dst_ops);
+ if (rt == NULL)
+ goto e_nobufs;
+
+ atomic_set(&rt->u.dst.__refcnt, 1);
+ rt->u.dst.flags = DST_HOST;
+
+ rt->fl.fld_src = oldflp->fld_src;
+ rt->fl.fld_dst = oldflp->fld_dst;
+ rt->fl.oif = oldflp->oif;
+ rt->fl.iif = 0;
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ rt->fl.fld_fwmark = oldflp->fld_fwmark;
+#endif
+
+ rt->rt_saddr = fl.fld_src;
+ rt->rt_daddr = fl.fld_dst;
+ rt->rt_gateway = gateway ? gateway : fl.fld_dst;
+ rt->rt_local_src = fl.fld_src;
+
+ rt->rt_dst_map = fl.fld_dst;
+ rt->rt_src_map = fl.fld_src;
+
+ rt->u.dst.dev = dev_out;
+ dev_hold(dev_out);
+ rt->u.dst.neighbour = neigh;
+ neigh = NULL;
+
+ rt->u.dst.lastuse = jiffies;
+ rt->u.dst.output = dn_output;
+ rt->u.dst.input = dn_rt_bug;
+ rt->rt_flags = flags;
+ if (flags & RTCF_LOCAL)
+ rt->u.dst.input = dn_nsp_rx;
+
+ err = dn_rt_set_next_hop(rt, &res);
+ if (err)
+ goto e_neighbour;
+
+ hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
+ dn_insert_route(rt, hash, (struct dn_route **)pprt);
+
+done:
+ if (neigh)
+ neigh_release(neigh);
+ if (free_res)
+ dn_fib_res_put(&res);
+ if (dev_out)
+ dev_put(dev_out);
+out:
+ return err;
+
+e_addr:
+ err = -EADDRNOTAVAIL;
+ goto done;
+e_inval:
+ err = -EINVAL;
+ goto done;
+e_nobufs:
+ err = -ENOBUFS;
+ goto done;
+e_neighbour:
+ dst_free(&rt->u.dst);
+ goto e_nobufs;
+}
+
+
+/*
+ * N.B. The flags may be moved into the flowi at some future stage.
+ */
+static int __dn_route_output_key(struct dst_entry **pprt, const struct flowi *flp, int flags)
+{
+ unsigned hash = dn_hash(flp->fld_src, flp->fld_dst);
+ struct dn_route *rt = NULL;
+
+ if (!(flags & MSG_TRYHARD)) {
+ rcu_read_lock_bh();
+ for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt;
+ rt = rcu_dereference(rt->u.rt_next)) {
+ if ((flp->fld_dst == rt->fl.fld_dst) &&
+ (flp->fld_src == rt->fl.fld_src) &&
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ (flp->fld_fwmark == rt->fl.fld_fwmark) &&
+#endif
+ (rt->fl.iif == 0) &&
+ (rt->fl.oif == flp->oif)) {
+ rt->u.dst.lastuse = jiffies;
+ dst_hold(&rt->u.dst);
+ rt->u.dst.__use++;
+ rcu_read_unlock_bh();
+ *pprt = &rt->u.dst;
+ return 0;
+ }
+ }
+ rcu_read_unlock_bh();
+ }
+
+ return dn_route_output_slow(pprt, flp, flags);
+}
+
+static int dn_route_output_key(struct dst_entry **pprt, struct flowi *flp, int flags)
+{
+ int err;
+
+ err = __dn_route_output_key(pprt, flp, flags);
+ if (err == 0 && flp->proto) {
+ err = xfrm_lookup(pprt, flp, NULL, 0);
+ }
+ return err;
+}
+
+int dn_route_output_sock(struct dst_entry **pprt, struct flowi *fl, struct sock *sk, int flags)
+{
+ int err;
+
+ err = __dn_route_output_key(pprt, fl, flags & MSG_TRYHARD);
+ if (err == 0 && fl->proto) {
+ err = xfrm_lookup(pprt, fl, sk, !(flags & MSG_DONTWAIT));
+ }
+ return err;
+}
+
+static int dn_route_input_slow(struct sk_buff *skb)
+{
+ struct dn_route *rt = NULL;
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ struct net_device *in_dev = skb->dev;
+ struct net_device *out_dev = NULL;
+ struct dn_dev *dn_db;
+ struct neighbour *neigh = NULL;
+ unsigned hash;
+ int flags = 0;
+ __u16 gateway = 0;
+ __u16 local_src = 0;
+ struct flowi fl = { .nl_u = { .dn_u =
+ { .daddr = cb->dst,
+ .saddr = cb->src,
+ .scope = RT_SCOPE_UNIVERSE,
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ .fwmark = skb->nfmark
+#endif
+ } },
+ .iif = skb->dev->ifindex };
+ struct dn_fib_res res = { .fi = NULL, .type = RTN_UNREACHABLE };
+ int err = -EINVAL;
+ int free_res = 0;
+
+ dev_hold(in_dev);
+
+ if ((dn_db = in_dev->dn_ptr) == NULL)
+ goto out;
+
+ /* Zero source addresses are not allowed */
+ if (fl.fld_src == 0)
+ goto out;
+
+ /*
+ * In this case we've just received a packet from a source
+ * outside ourselves pretending to come from us. We don't
+ * allow it any further to prevent routing loops, spoofing and
+ * other nasties. Loopback packets already have the dst attached
+ * so this only affects packets which have originated elsewhere.
+ */
+ err = -ENOTUNIQ;
+ if (dn_dev_islocal(in_dev, cb->src))
+ goto out;
+
+ err = dn_fib_lookup(&fl, &res);
+ if (err) {
+ if (err != -ESRCH)
+ goto out;
+ /*
+ * Is the destination us ?
+ */
+ if (!dn_dev_islocal(in_dev, cb->dst))
+ goto e_inval;
+
+ res.type = RTN_LOCAL;
+ flags |= RTCF_DIRECTSRC;
+ } else {
+ __u16 src_map = fl.fld_src;
+ free_res = 1;
+
+ out_dev = DN_FIB_RES_DEV(res);
+ if (out_dev == NULL) {
+ if (net_ratelimit())
+ printk(KERN_CRIT "Bug in dn_route_input_slow() "
+ "No output device\n");
+ goto e_inval;
+ }
+ dev_hold(out_dev);
+
+ if (res.r)
+ src_map = dn_fib_rules_policy(fl.fld_src, &res, &flags);
+
+ gateway = DN_FIB_RES_GW(res);
+ if (res.type == RTN_NAT) {
+ fl.fld_dst = dn_fib_rules_map_destination(fl.fld_dst, &res);
+ dn_fib_res_put(&res);
+ free_res = 0;
+ if (dn_fib_lookup(&fl, &res))
+ goto e_inval;
+ free_res = 1;
+ if (res.type != RTN_UNICAST)
+ goto e_inval;
+ flags |= RTCF_DNAT;
+ gateway = fl.fld_dst;
+ }
+ fl.fld_src = src_map;
+ }
+
+ switch(res.type) {
+ case RTN_UNICAST:
+ /*
+ * Forwarding check here, we only check for forwarding
+ * being turned off, if you want to only forward intra
+ * area, its up to you to set the routing tables up
+ * correctly.
+ */
+ if (dn_db->parms.forwarding == 0)
+ goto e_inval;
+
+ if (res.fi->fib_nhs > 1 && fl.oif == 0)
+ dn_fib_select_multipath(&fl, &res);
+
+ /*
+ * Check for out_dev == in_dev. We use the RTCF_DOREDIRECT
+ * flag as a hint to set the intra-ethernet bit when
+ * forwarding. If we've got NAT in operation, we don't do
+ * this optimisation.
+ */
+ if (out_dev == in_dev && !(flags & RTCF_NAT))
+ flags |= RTCF_DOREDIRECT;
+
+ local_src = DN_FIB_RES_PREFSRC(res);
+
+ case RTN_BLACKHOLE:
+ case RTN_UNREACHABLE:
+ break;
+ case RTN_LOCAL:
+ flags |= RTCF_LOCAL;
+ fl.fld_src = cb->dst;
+ fl.fld_dst = cb->src;
+
+ /* Routing tables gave us a gateway */
+ if (gateway)
+ goto make_route;
+
+ /* Packet was intra-ethernet, so we know its on-link */
+ if (cb->rt_flags | DN_RT_F_IE) {
+ gateway = cb->src;
+ flags |= RTCF_DIRECTSRC;
+ goto make_route;
+ }
+
+ /* Use the default router if there is one */
+ neigh = neigh_clone(dn_db->router);
+ if (neigh) {
+ gateway = ((struct dn_neigh *)neigh)->addr;
+ goto make_route;
+ }
+
+ /* Close eyes and pray */
+ gateway = cb->src;
+ flags |= RTCF_DIRECTSRC;
+ goto make_route;
+ default:
+ goto e_inval;
+ }
+
+make_route:
+ rt = dst_alloc(&dn_dst_ops);
+ if (rt == NULL)
+ goto e_nobufs;
+
+ rt->rt_saddr = fl.fld_src;
+ rt->rt_daddr = fl.fld_dst;
+ rt->rt_gateway = fl.fld_dst;
+ if (gateway)
+ rt->rt_gateway = gateway;
+ rt->rt_local_src = local_src ? local_src : rt->rt_saddr;
+
+ rt->rt_dst_map = fl.fld_dst;
+ rt->rt_src_map = fl.fld_src;
+
+ rt->fl.fld_src = cb->src;
+ rt->fl.fld_dst = cb->dst;
+ rt->fl.oif = 0;
+ rt->fl.iif = in_dev->ifindex;
+ rt->fl.fld_fwmark = fl.fld_fwmark;
+
+ rt->u.dst.flags = DST_HOST;
+ rt->u.dst.neighbour = neigh;
+ rt->u.dst.dev = out_dev;
+ rt->u.dst.lastuse = jiffies;
+ rt->u.dst.output = dn_rt_bug;
+ switch(res.type) {
+ case RTN_UNICAST:
+ rt->u.dst.input = dn_forward;
+ break;
+ case RTN_LOCAL:
+ rt->u.dst.output = dn_output;
+ rt->u.dst.input = dn_nsp_rx;
+ rt->u.dst.dev = in_dev;
+ flags |= RTCF_LOCAL;
+ break;
+ default:
+ case RTN_UNREACHABLE:
+ case RTN_BLACKHOLE:
+ rt->u.dst.input = dn_blackhole;
+ }
+ rt->rt_flags = flags;
+ if (rt->u.dst.dev)
+ dev_hold(rt->u.dst.dev);
+
+ err = dn_rt_set_next_hop(rt, &res);
+ if (err)
+ goto e_neighbour;
+
+ hash = dn_hash(rt->fl.fld_src, rt->fl.fld_dst);
+ dn_insert_route(rt, hash, (struct dn_route **)&skb->dst);
+
+done:
+ if (neigh)
+ neigh_release(neigh);
+ if (free_res)
+ dn_fib_res_put(&res);
+ dev_put(in_dev);
+ if (out_dev)
+ dev_put(out_dev);
+out:
+ return err;
+
+e_inval:
+ err = -EINVAL;
+ goto done;
+
+e_nobufs:
+ err = -ENOBUFS;
+ goto done;
+
+e_neighbour:
+ dst_free(&rt->u.dst);
+ goto done;
+}
+
+int dn_route_input(struct sk_buff *skb)
+{
+ struct dn_route *rt;
+ struct dn_skb_cb *cb = DN_SKB_CB(skb);
+ unsigned hash = dn_hash(cb->src, cb->dst);
+
+ if (skb->dst)
+ return 0;
+
+ rcu_read_lock();
+ for(rt = rcu_dereference(dn_rt_hash_table[hash].chain); rt != NULL;
+ rt = rcu_dereference(rt->u.rt_next)) {
+ if ((rt->fl.fld_src == cb->src) &&
+ (rt->fl.fld_dst == cb->dst) &&
+ (rt->fl.oif == 0) &&
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ (rt->fl.fld_fwmark == skb->nfmark) &&
+#endif
+ (rt->fl.iif == cb->iif)) {
+ rt->u.dst.lastuse = jiffies;
+ dst_hold(&rt->u.dst);
+ rt->u.dst.__use++;
+ rcu_read_unlock();
+ skb->dst = (struct dst_entry *)rt;
+ return 0;
+ }
+ }
+ rcu_read_unlock();
+
+ return dn_route_input_slow(skb);
+}
+
+static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, int nowait)
+{
+ struct dn_route *rt = (struct dn_route *)skb->dst;
+ struct rtmsg *r;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb->tail;
+ struct rta_cacheinfo ci;
+
+ nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*r));
+ r = NLMSG_DATA(nlh);
+ nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0;
+ r->rtm_family = AF_DECnet;
+ r->rtm_dst_len = 16;
+ r->rtm_src_len = 0;
+ r->rtm_tos = 0;
+ r->rtm_table = RT_TABLE_MAIN;
+ r->rtm_type = rt->rt_type;
+ r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED;
+ r->rtm_scope = RT_SCOPE_UNIVERSE;
+ r->rtm_protocol = RTPROT_UNSPEC;
+ if (rt->rt_flags & RTCF_NOTIFY)
+ r->rtm_flags |= RTM_F_NOTIFY;
+ RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr);
+ if (rt->fl.fld_src) {
+ r->rtm_src_len = 16;
+ RTA_PUT(skb, RTA_SRC, 2, &rt->fl.fld_src);
+ }
+ if (rt->u.dst.dev)
+ RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex);
+ /*
+ * Note to self - change this if input routes reverse direction when
+ * they deal only with inputs and not with replies like they do
+ * currently.
+ */
+ RTA_PUT(skb, RTA_PREFSRC, 2, &rt->rt_local_src);
+ if (rt->rt_daddr != rt->rt_gateway)
+ RTA_PUT(skb, RTA_GATEWAY, 2, &rt->rt_gateway);
+ if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
+ goto rtattr_failure;
+ ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
+ ci.rta_used = rt->u.dst.__use;
+ ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
+ if (rt->u.dst.expires)
+ ci.rta_expires = jiffies_to_clock_t(rt->u.dst.expires - jiffies);
+ else
+ ci.rta_expires = 0;
+ ci.rta_error = rt->u.dst.error;
+ ci.rta_id = ci.rta_ts = ci.rta_tsage = 0;
+ RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);
+ if (rt->fl.iif)
+ RTA_PUT(skb, RTA_IIF, sizeof(int), &rt->fl.iif);
+
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+/*
+ * This is called by both endnodes and routers now.
+ */
+int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ struct rtmsg *rtm = NLMSG_DATA(nlh);
+ struct dn_route *rt = NULL;
+ struct dn_skb_cb *cb;
+ int err;
+ struct sk_buff *skb;
+ struct flowi fl;
+
+ memset(&fl, 0, sizeof(fl));
+ fl.proto = DNPROTO_NSP;
+
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (skb == NULL)
+ return -ENOBUFS;
+ skb->mac.raw = skb->data;
+ cb = DN_SKB_CB(skb);
+
+ if (rta[RTA_SRC-1])
+ memcpy(&fl.fld_src, RTA_DATA(rta[RTA_SRC-1]), 2);
+ if (rta[RTA_DST-1])
+ memcpy(&fl.fld_dst, RTA_DATA(rta[RTA_DST-1]), 2);
+ if (rta[RTA_IIF-1])
+ memcpy(&fl.iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
+
+ if (fl.iif) {
+ struct net_device *dev;
+ if ((dev = dev_get_by_index(fl.iif)) == NULL) {
+ kfree_skb(skb);
+ return -ENODEV;
+ }
+ if (!dev->dn_ptr) {
+ dev_put(dev);
+ kfree_skb(skb);
+ return -ENODEV;
+ }
+ skb->protocol = __constant_htons(ETH_P_DNA_RT);
+ skb->dev = dev;
+ cb->src = fl.fld_src;
+ cb->dst = fl.fld_dst;
+ local_bh_disable();
+ err = dn_route_input(skb);
+ local_bh_enable();
+ memset(cb, 0, sizeof(struct dn_skb_cb));
+ rt = (struct dn_route *)skb->dst;
+ if (!err && -rt->u.dst.error)
+ err = rt->u.dst.error;
+ } else {
+ int oif = 0;
+ if (rta[RTA_OIF - 1])
+ memcpy(&oif, RTA_DATA(rta[RTA_OIF - 1]), sizeof(int));
+ fl.oif = oif;
+ err = dn_route_output_key((struct dst_entry **)&rt, &fl, 0);
+ }
+
+ if (skb->dev)
+ dev_put(skb->dev);
+ skb->dev = NULL;
+ if (err)
+ goto out_free;
+ skb->dst = &rt->u.dst;
+ if (rtm->rtm_flags & RTM_F_NOTIFY)
+ rt->rt_flags |= RTCF_NOTIFY;
+
+ NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
+
+ err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0);
+
+ if (err == 0)
+ goto out_free;
+ if (err < 0) {
+ err = -EMSGSIZE;
+ goto out_free;
+ }
+
+ err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
+
+ return err;
+
+out_free:
+ kfree_skb(skb);
+ return err;
+}
+
+/*
+ * For routers, this is called from dn_fib_dump, but for endnodes its
+ * called directly from the rtnetlink dispatch table.
+ */
+int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct dn_route *rt;
+ int h, s_h;
+ int idx, s_idx;
+
+ if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg))
+ return -EINVAL;
+ if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED))
+ return 0;
+
+ s_h = cb->args[0];
+ s_idx = idx = cb->args[1];
+ for(h = 0; h <= dn_rt_hash_mask; h++) {
+ if (h < s_h)
+ continue;
+ if (h > s_h)
+ s_idx = 0;
+ rcu_read_lock_bh();
+ for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0;
+ rt;
+ rt = rcu_dereference(rt->u.rt_next), idx++) {
+ if (idx < s_idx)
+ continue;
+ skb->dst = dst_clone(&rt->u.dst);
+ if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, RTM_NEWROUTE, 1) <= 0) {
+ dst_release(xchg(&skb->dst, NULL));
+ rcu_read_unlock_bh();
+ goto done;
+ }
+ dst_release(xchg(&skb->dst, NULL));
+ }
+ rcu_read_unlock_bh();
+ }
+
+done:
+ cb->args[0] = h;
+ cb->args[1] = idx;
+ return skb->len;
+}
+
+#ifdef CONFIG_PROC_FS
+struct dn_rt_cache_iter_state {
+ int bucket;
+};
+
+static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq)
+{
+ struct dn_route *rt = NULL;
+ struct dn_rt_cache_iter_state *s = seq->private;
+
+ for(s->bucket = dn_rt_hash_mask; s->bucket >= 0; --s->bucket) {
+ rcu_read_lock_bh();
+ rt = dn_rt_hash_table[s->bucket].chain;
+ if (rt)
+ break;
+ rcu_read_unlock_bh();
+ }
+ return rt;
+}
+
+static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
+{
+ struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private);
+
+ rt = rt->u.rt_next;
+ while(!rt) {
+ rcu_read_unlock_bh();
+ if (--s->bucket < 0)
+ break;
+ rcu_read_lock_bh();
+ rt = dn_rt_hash_table[s->bucket].chain;
+ }
+ return rt;
+}
+
+static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct dn_route *rt = dn_rt_cache_get_first(seq);
+
+ if (rt) {
+ while(*pos && (rt = dn_rt_cache_get_next(seq, rt)))
+ --*pos;
+ }
+ return *pos ? NULL : rt;
+}
+
+static void *dn_rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct dn_route *rt = dn_rt_cache_get_next(seq, v);
+ ++*pos;
+ return rt;
+}
+
+static void dn_rt_cache_seq_stop(struct seq_file *seq, void *v)
+{
+ if (v)
+ rcu_read_unlock_bh();
+}
+
+static int dn_rt_cache_seq_show(struct seq_file *seq, void *v)
+{
+ struct dn_route *rt = v;
+ char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
+
+ seq_printf(seq, "%-8s %-7s %-7s %04d %04d %04d\n",
+ rt->u.dst.dev ? rt->u.dst.dev->name : "*",
+ dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1),
+ dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2),
+ atomic_read(&rt->u.dst.__refcnt),
+ rt->u.dst.__use,
+ (int) dst_metric(&rt->u.dst, RTAX_RTT));
+ return 0;
+}
+
+static struct seq_operations dn_rt_cache_seq_ops = {
+ .start = dn_rt_cache_seq_start,
+ .next = dn_rt_cache_seq_next,
+ .stop = dn_rt_cache_seq_stop,
+ .show = dn_rt_cache_seq_show,
+};
+
+static int dn_rt_cache_seq_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq;
+ int rc = -ENOMEM;
+ struct dn_rt_cache_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+ if (!s)
+ goto out;
+ rc = seq_open(file, &dn_rt_cache_seq_ops);
+ if (rc)
+ goto out_kfree;
+ seq = file->private_data;
+ seq->private = s;
+ memset(s, 0, sizeof(*s));
+out:
+ return rc;
+out_kfree:
+ kfree(s);
+ goto out;
+}
+
+static struct file_operations dn_rt_cache_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = dn_rt_cache_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
+#endif /* CONFIG_PROC_FS */
+
+void __init dn_route_init(void)
+{
+ int i, goal, order;
+
+ dn_dst_ops.kmem_cachep = kmem_cache_create("dn_dst_cache",
+ sizeof(struct dn_route),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL, NULL);
+
+ if (!dn_dst_ops.kmem_cachep)
+ panic("DECnet: Failed to allocate dn_dst_cache\n");
+
+ init_timer(&dn_route_timer);
+ dn_route_timer.function = dn_dst_check_expire;
+ dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
+ add_timer(&dn_route_timer);
+
+ goal = num_physpages >> (26 - PAGE_SHIFT);
+
+ for(order = 0; (1UL << order) < goal; order++)
+ /* NOTHING */;
+
+ /*
+ * Only want 1024 entries max, since the table is very, very unlikely
+ * to be larger than that.
+ */
+ while(order && ((((1UL << order) * PAGE_SIZE) /
+ sizeof(struct dn_rt_hash_bucket)) >= 2048))
+ order--;
+
+ do {
+ dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
+ sizeof(struct dn_rt_hash_bucket);
+ while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
+ dn_rt_hash_mask--;
+ dn_rt_hash_table = (struct dn_rt_hash_bucket *)
+ __get_free_pages(GFP_ATOMIC, order);
+ } while (dn_rt_hash_table == NULL && --order > 0);
+
+ if (!dn_rt_hash_table)
+ panic("Failed to allocate DECnet route cache hash table\n");
+
+ printk(KERN_INFO
+ "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
+ dn_rt_hash_mask,
+ (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
+
+ dn_rt_hash_mask--;
+ for(i = 0; i <= dn_rt_hash_mask; i++) {
+ spin_lock_init(&dn_rt_hash_table[i].lock);
+ dn_rt_hash_table[i].chain = NULL;
+ }
+
+ dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
+
+ proc_net_fops_create("decnet_cache", S_IRUGO, &dn_rt_cache_seq_fops);
+}
+
+void __exit dn_route_cleanup(void)
+{
+ del_timer(&dn_route_timer);
+ dn_run_flush(0);
+
+ proc_net_remove("decnet_cache");
+}
+
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
new file mode 100644
index 0000000..597587d
--- /dev/null
+++ b/net/decnet/dn_rules.c
@@ -0,0 +1,416 @@
+
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Routing Forwarding Information Base (Rules)
+ *
+ * Author: Steve Whitehouse <SteveW@ACM.org>
+ * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
+ *
+ *
+ * Changes:
+ *
+ */
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/net.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/netdevice.h>
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include <linux/in_route.h>
+#include <asm/atomic.h>
+#include <asm/uaccess.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_fib.h>
+#include <net/dn_neigh.h>
+#include <net/dn_dev.h>
+
+struct dn_fib_rule
+{
+ struct dn_fib_rule *r_next;
+ atomic_t r_clntref;
+ u32 r_preference;
+ unsigned char r_table;
+ unsigned char r_action;
+ unsigned char r_dst_len;
+ unsigned char r_src_len;
+ dn_address r_src;
+ dn_address r_srcmask;
+ dn_address r_dst;
+ dn_address r_dstmask;
+ dn_address r_srcmap;
+ u8 r_flags;
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ u32 r_fwmark;
+#endif
+ int r_ifindex;
+ char r_ifname[IFNAMSIZ];
+ int r_dead;
+};
+
+static struct dn_fib_rule default_rule = {
+ .r_clntref = ATOMIC_INIT(2),
+ .r_preference = 0x7fff,
+ .r_table = RT_TABLE_MAIN,
+ .r_action = RTN_UNICAST
+};
+
+static struct dn_fib_rule *dn_fib_rules = &default_rule;
+static DEFINE_RWLOCK(dn_fib_rules_lock);
+
+
+int dn_fib_rtm_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ struct rtmsg *rtm = NLMSG_DATA(nlh);
+ struct dn_fib_rule *r, **rp;
+ int err = -ESRCH;
+
+ for(rp=&dn_fib_rules; (r=*rp) != NULL; rp = &r->r_next) {
+ if ((!rta[RTA_SRC-1] || memcmp(RTA_DATA(rta[RTA_SRC-1]), &r->r_src, 2) == 0) &&
+ rtm->rtm_src_len == r->r_src_len &&
+ rtm->rtm_dst_len == r->r_dst_len &&
+ (!rta[RTA_DST-1] || memcmp(RTA_DATA(rta[RTA_DST-1]), &r->r_dst, 2) == 0) &&
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ (!rta[RTA_PROTOINFO-1] || memcmp(RTA_DATA(rta[RTA_PROTOINFO-1]), &r->r_fwmark, 4) == 0) &&
+#endif
+ (!rtm->rtm_type || rtm->rtm_type == r->r_action) &&
+ (!rta[RTA_PRIORITY-1] || memcmp(RTA_DATA(rta[RTA_PRIORITY-1]), &r->r_preference, 4) == 0) &&
+ (!rta[RTA_IIF-1] || rtattr_strcmp(rta[RTA_IIF-1], r->r_ifname) == 0) &&
+ (!rtm->rtm_table || (r && rtm->rtm_table == r->r_table))) {
+
+ err = -EPERM;
+ if (r == &default_rule)
+ break;
+
+ write_lock_bh(&dn_fib_rules_lock);
+ *rp = r->r_next;
+ r->r_dead = 1;
+ write_unlock_bh(&dn_fib_rules_lock);
+ dn_fib_rule_put(r);
+ err = 0;
+ break;
+ }
+ }
+
+ return err;
+}
+
+void dn_fib_rule_put(struct dn_fib_rule *r)
+{
+ if (atomic_dec_and_test(&r->r_clntref)) {
+ if (r->r_dead)
+ kfree(r);
+ else
+ printk(KERN_DEBUG "Attempt to free alive dn_fib_rule\n");
+ }
+}
+
+
+int dn_fib_rtm_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct rtattr **rta = arg;
+ struct rtmsg *rtm = NLMSG_DATA(nlh);
+ struct dn_fib_rule *r, *new_r, **rp;
+ unsigned char table_id;
+
+ if (rtm->rtm_src_len > 16 || rtm->rtm_dst_len > 16)
+ return -EINVAL;
+
+ if (rta[RTA_IIF-1] && RTA_PAYLOAD(rta[RTA_IIF-1]) > IFNAMSIZ)
+ return -EINVAL;
+
+ if (rtm->rtm_type == RTN_NAT)
+ return -EINVAL;
+
+ table_id = rtm->rtm_table;
+ if (table_id == RT_TABLE_UNSPEC) {
+ struct dn_fib_table *tb;
+ if (rtm->rtm_type == RTN_UNICAST) {
+ if ((tb = dn_fib_empty_table()) == NULL)
+ return -ENOBUFS;
+ table_id = tb->n;
+ }
+ }
+
+ new_r = kmalloc(sizeof(*new_r), GFP_KERNEL);
+ if (!new_r)
+ return -ENOMEM;
+ memset(new_r, 0, sizeof(*new_r));
+ if (rta[RTA_SRC-1])
+ memcpy(&new_r->r_src, RTA_DATA(rta[RTA_SRC-1]), 2);
+ if (rta[RTA_DST-1])
+ memcpy(&new_r->r_dst, RTA_DATA(rta[RTA_DST-1]), 2);
+ if (rta[RTA_GATEWAY-1])
+ memcpy(&new_r->r_srcmap, RTA_DATA(rta[RTA_GATEWAY-1]), 2);
+ new_r->r_src_len = rtm->rtm_src_len;
+ new_r->r_dst_len = rtm->rtm_dst_len;
+ new_r->r_srcmask = dnet_make_mask(rtm->rtm_src_len);
+ new_r->r_dstmask = dnet_make_mask(rtm->rtm_dst_len);
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ if (rta[RTA_PROTOINFO-1])
+ memcpy(&new_r->r_fwmark, RTA_DATA(rta[RTA_PROTOINFO-1]), 4);
+#endif
+ new_r->r_action = rtm->rtm_type;
+ new_r->r_flags = rtm->rtm_flags;
+ if (rta[RTA_PRIORITY-1])
+ memcpy(&new_r->r_preference, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
+ new_r->r_table = table_id;
+ if (rta[RTA_IIF-1]) {
+ struct net_device *dev;
+ rtattr_strlcpy(new_r->r_ifname, rta[RTA_IIF-1], IFNAMSIZ);
+ new_r->r_ifindex = -1;
+ dev = dev_get_by_name(new_r->r_ifname);
+ if (dev) {
+ new_r->r_ifindex = dev->ifindex;
+ dev_put(dev);
+ }
+ }
+
+ rp = &dn_fib_rules;
+ if (!new_r->r_preference) {
+ r = dn_fib_rules;
+ if (r && (r = r->r_next) != NULL) {
+ rp = &dn_fib_rules->r_next;
+ if (r->r_preference)
+ new_r->r_preference = r->r_preference - 1;
+ }
+ }
+
+ while((r=*rp) != NULL) {
+ if (r->r_preference > new_r->r_preference)
+ break;
+ rp = &r->r_next;
+ }
+
+ new_r->r_next = r;
+ atomic_inc(&new_r->r_clntref);
+ write_lock_bh(&dn_fib_rules_lock);
+ *rp = new_r;
+ write_unlock_bh(&dn_fib_rules_lock);
+ return 0;
+}
+
+
+int dn_fib_lookup(const struct flowi *flp, struct dn_fib_res *res)
+{
+ struct dn_fib_rule *r, *policy;
+ struct dn_fib_table *tb;
+ dn_address saddr = flp->fld_src;
+ dn_address daddr = flp->fld_dst;
+ int err;
+
+ read_lock(&dn_fib_rules_lock);
+ for(r = dn_fib_rules; r; r = r->r_next) {
+ if (((saddr^r->r_src) & r->r_srcmask) ||
+ ((daddr^r->r_dst) & r->r_dstmask) ||
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ (r->r_fwmark && r->r_fwmark != flp->fld_fwmark) ||
+#endif
+ (r->r_ifindex && r->r_ifindex != flp->iif))
+ continue;
+
+ switch(r->r_action) {
+ case RTN_UNICAST:
+ case RTN_NAT:
+ policy = r;
+ break;
+ case RTN_UNREACHABLE:
+ read_unlock(&dn_fib_rules_lock);
+ return -ENETUNREACH;
+ default:
+ case RTN_BLACKHOLE:
+ read_unlock(&dn_fib_rules_lock);
+ return -EINVAL;
+ case RTN_PROHIBIT:
+ read_unlock(&dn_fib_rules_lock);
+ return -EACCES;
+ }
+
+ if ((tb = dn_fib_get_table(r->r_table, 0)) == NULL)
+ continue;
+ err = tb->lookup(tb, flp, res);
+ if (err == 0) {
+ res->r = policy;
+ if (policy)
+ atomic_inc(&policy->r_clntref);
+ read_unlock(&dn_fib_rules_lock);
+ return 0;
+ }
+ if (err < 0 && err != -EAGAIN) {
+ read_unlock(&dn_fib_rules_lock);
+ return err;
+ }
+ }
+
+ read_unlock(&dn_fib_rules_lock);
+ return -ESRCH;
+}
+
+unsigned dnet_addr_type(__u16 addr)
+{
+ struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
+ struct dn_fib_res res;
+ unsigned ret = RTN_UNICAST;
+ struct dn_fib_table *tb = dn_fib_tables[RT_TABLE_LOCAL];
+
+ res.r = NULL;
+
+ if (tb) {
+ if (!tb->lookup(tb, &fl, &res)) {
+ ret = res.type;
+ dn_fib_res_put(&res);
+ }
+ }
+ return ret;
+}
+
+__u16 dn_fib_rules_policy(__u16 saddr, struct dn_fib_res *res, unsigned *flags)
+{
+ struct dn_fib_rule *r = res->r;
+
+ if (r->r_action == RTN_NAT) {
+ int addrtype = dnet_addr_type(r->r_srcmap);
+
+ if (addrtype == RTN_NAT) {
+ saddr = (saddr&~r->r_srcmask)|r->r_srcmap;
+ *flags |= RTCF_SNAT;
+ } else if (addrtype == RTN_LOCAL || r->r_srcmap == 0) {
+ saddr = r->r_srcmap;
+ *flags |= RTCF_MASQ;
+ }
+ }
+ return saddr;
+}
+
+static void dn_fib_rules_detach(struct net_device *dev)
+{
+ struct dn_fib_rule *r;
+
+ for(r = dn_fib_rules; r; r = r->r_next) {
+ if (r->r_ifindex == dev->ifindex) {
+ write_lock_bh(&dn_fib_rules_lock);
+ r->r_ifindex = -1;
+ write_unlock_bh(&dn_fib_rules_lock);
+ }
+ }
+}
+
+static void dn_fib_rules_attach(struct net_device *dev)
+{
+ struct dn_fib_rule *r;
+
+ for(r = dn_fib_rules; r; r = r->r_next) {
+ if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0) {
+ write_lock_bh(&dn_fib_rules_lock);
+ r->r_ifindex = dev->ifindex;
+ write_unlock_bh(&dn_fib_rules_lock);
+ }
+ }
+}
+
+static int dn_fib_rules_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+ struct net_device *dev = ptr;
+
+ switch(event) {
+ case NETDEV_UNREGISTER:
+ dn_fib_rules_detach(dev);
+ dn_fib_sync_down(0, dev, 1);
+ case NETDEV_REGISTER:
+ dn_fib_rules_attach(dev);
+ dn_fib_sync_up(dev);
+ }
+
+ return NOTIFY_DONE;
+}
+
+
+static struct notifier_block dn_fib_rules_notifier = {
+ .notifier_call = dn_fib_rules_event,
+};
+
+static int dn_fib_fill_rule(struct sk_buff *skb, struct dn_fib_rule *r, struct netlink_callback *cb)
+{
+ struct rtmsg *rtm;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb->tail;
+
+
+ nlh = NLMSG_PUT(skb, NETLINK_CREDS(cb->skb)->pid, cb->nlh->nlmsg_seq, RTM_NEWRULE, sizeof(*rtm));
+ rtm = NLMSG_DATA(nlh);
+ rtm->rtm_family = AF_DECnet;
+ rtm->rtm_dst_len = r->r_dst_len;
+ rtm->rtm_src_len = r->r_src_len;
+ rtm->rtm_tos = 0;
+#ifdef CONFIG_DECNET_ROUTE_FWMARK
+ if (r->r_fwmark)
+ RTA_PUT(skb, RTA_PROTOINFO, 4, &r->r_fwmark);
+#endif
+ rtm->rtm_table = r->r_table;
+ rtm->rtm_protocol = 0;
+ rtm->rtm_scope = 0;
+ rtm->rtm_type = r->r_action;
+ rtm->rtm_flags = r->r_flags;
+
+ if (r->r_dst_len)
+ RTA_PUT(skb, RTA_DST, 2, &r->r_dst);
+ if (r->r_src_len)
+ RTA_PUT(skb, RTA_SRC, 2, &r->r_src);
+ if (r->r_ifname[0])
+ RTA_PUT(skb, RTA_IIF, IFNAMSIZ, &r->r_ifname);
+ if (r->r_preference)
+ RTA_PUT(skb, RTA_PRIORITY, 4, &r->r_preference);
+ if (r->r_srcmap)
+ RTA_PUT(skb, RTA_GATEWAY, 2, &r->r_srcmap);
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int idx;
+ int s_idx = cb->args[0];
+ struct dn_fib_rule *r;
+
+ read_lock(&dn_fib_rules_lock);
+ for(r = dn_fib_rules, idx = 0; r; r = r->r_next, idx++) {
+ if (idx < s_idx)
+ continue;
+ if (dn_fib_fill_rule(skb, r, cb) < 0)
+ break;
+ }
+ read_unlock(&dn_fib_rules_lock);
+ cb->args[0] = idx;
+
+ return skb->len;
+}
+
+void __init dn_fib_rules_init(void)
+{
+ register_netdevice_notifier(&dn_fib_rules_notifier);
+}
+
+void __exit dn_fib_rules_cleanup(void)
+{
+ unregister_netdevice_notifier(&dn_fib_rules_notifier);
+}
+
+
diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c
new file mode 100644
index 0000000..dad5603
--- /dev/null
+++ b/net/decnet/dn_table.c
@@ -0,0 +1,825 @@
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Routing Forwarding Information Base (Routing Tables)
+ *
+ * Author: Steve Whitehouse <SteveW@ACM.org>
+ * Mostly copied from the IPv4 routing code
+ *
+ *
+ * Changes:
+ *
+ */
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/net.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/netdevice.h>
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include <asm/atomic.h>
+#include <asm/uaccess.h>
+#include <linux/route.h> /* RTF_xxx */
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_route.h>
+#include <net/dn_fib.h>
+#include <net/dn_neigh.h>
+#include <net/dn_dev.h>
+
+struct dn_zone
+{
+ struct dn_zone *dz_next;
+ struct dn_fib_node **dz_hash;
+ int dz_nent;
+ int dz_divisor;
+ u32 dz_hashmask;
+#define DZ_HASHMASK(dz) ((dz)->dz_hashmask)
+ int dz_order;
+ u16 dz_mask;
+#define DZ_MASK(dz) ((dz)->dz_mask)
+};
+
+struct dn_hash
+{
+ struct dn_zone *dh_zones[17];
+ struct dn_zone *dh_zone_list;
+};
+
+#define dz_key_0(key) ((key).datum = 0)
+#define dz_prefix(key,dz) ((key).datum)
+
+#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
+ for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
+
+#define endfor_nexthops(fi) }
+
+#define DN_MAX_DIVISOR 1024
+#define DN_S_ZOMBIE 1
+#define DN_S_ACCESSED 2
+
+#define DN_FIB_SCAN(f, fp) \
+for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next)
+
+#define DN_FIB_SCAN_KEY(f, fp, key) \
+for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next)
+
+#define RT_TABLE_MIN 1
+
+static DEFINE_RWLOCK(dn_fib_tables_lock);
+struct dn_fib_table *dn_fib_tables[RT_TABLE_MAX + 1];
+
+static kmem_cache_t *dn_hash_kmem;
+static int dn_fib_hash_zombies;
+
+static inline dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz)
+{
+ u16 h = ntohs(key.datum)>>(16 - dz->dz_order);
+ h ^= (h >> 10);
+ h ^= (h >> 6);
+ h &= DZ_HASHMASK(dz);
+ return *(dn_fib_idx_t *)&h;
+}
+
+static inline dn_fib_key_t dz_key(u16 dst, struct dn_zone *dz)
+{
+ dn_fib_key_t k;
+ k.datum = dst & DZ_MASK(dz);
+ return k;
+}
+
+static inline struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz)
+{
+ return &dz->dz_hash[dn_hash(key, dz).datum];
+}
+
+static inline struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz)
+{
+ return dz->dz_hash[dn_hash(key, dz).datum];
+}
+
+static inline int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b)
+{
+ return a.datum == b.datum;
+}
+
+static inline int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b)
+{
+ return a.datum <= b.datum;
+}
+
+static inline void dn_rebuild_zone(struct dn_zone *dz,
+ struct dn_fib_node **old_ht,
+ int old_divisor)
+{
+ int i;
+ struct dn_fib_node *f, **fp, *next;
+
+ for(i = 0; i < old_divisor; i++) {
+ for(f = old_ht[i]; f; f = f->fn_next) {
+ next = f->fn_next;
+ for(fp = dn_chain_p(f->fn_key, dz);
+ *fp && dn_key_leq((*fp)->fn_key, f->fn_key);
+ fp = &(*fp)->fn_next)
+ /* NOTHING */;
+ f->fn_next = *fp;
+ *fp = f;
+ }
+ }
+}
+
+static void dn_rehash_zone(struct dn_zone *dz)
+{
+ struct dn_fib_node **ht, **old_ht;
+ int old_divisor, new_divisor;
+ u32 new_hashmask;
+
+ old_divisor = dz->dz_divisor;
+
+ switch(old_divisor) {
+ case 16:
+ new_divisor = 256;
+ new_hashmask = 0xFF;
+ break;
+ default:
+ printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n", old_divisor);
+ case 256:
+ new_divisor = 1024;
+ new_hashmask = 0x3FF;
+ break;
+ }
+
+ ht = kmalloc(new_divisor*sizeof(struct dn_fib_node*), GFP_KERNEL);
+
+ if (ht == NULL)
+ return;
+
+ memset(ht, 0, new_divisor*sizeof(struct dn_fib_node *));
+ write_lock_bh(&dn_fib_tables_lock);
+ old_ht = dz->dz_hash;
+ dz->dz_hash = ht;
+ dz->dz_hashmask = new_hashmask;
+ dz->dz_divisor = new_divisor;
+ dn_rebuild_zone(dz, old_ht, old_divisor);
+ write_unlock_bh(&dn_fib_tables_lock);
+ kfree(old_ht);
+}
+
+static void dn_free_node(struct dn_fib_node *f)
+{
+ dn_fib_release_info(DN_FIB_INFO(f));
+ kmem_cache_free(dn_hash_kmem, f);
+}
+
+
+static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
+{
+ int i;
+ struct dn_zone *dz = kmalloc(sizeof(struct dn_zone), GFP_KERNEL);
+ if (!dz)
+ return NULL;
+
+ memset(dz, 0, sizeof(struct dn_zone));
+ if (z) {
+ dz->dz_divisor = 16;
+ dz->dz_hashmask = 0x0F;
+ } else {
+ dz->dz_divisor = 1;
+ dz->dz_hashmask = 0;
+ }
+
+ dz->dz_hash = kmalloc(dz->dz_divisor*sizeof(struct dn_fib_node *), GFP_KERNEL);
+
+ if (!dz->dz_hash) {
+ kfree(dz);
+ return NULL;
+ }
+
+ memset(dz->dz_hash, 0, dz->dz_divisor*sizeof(struct dn_fib_node*));
+ dz->dz_order = z;
+ dz->dz_mask = dnet_make_mask(z);
+
+ for(i = z + 1; i <= 16; i++)
+ if (table->dh_zones[i])
+ break;
+
+ write_lock_bh(&dn_fib_tables_lock);
+ if (i>16) {
+ dz->dz_next = table->dh_zone_list;
+ table->dh_zone_list = dz;
+ } else {
+ dz->dz_next = table->dh_zones[i]->dz_next;
+ table->dh_zones[i]->dz_next = dz;
+ }
+ table->dh_zones[z] = dz;
+ write_unlock_bh(&dn_fib_tables_lock);
+ return dz;
+}
+
+
+static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi)
+{
+ struct rtnexthop *nhp;
+ int nhlen;
+
+ if (rta->rta_priority && *rta->rta_priority != fi->fib_priority)
+ return 1;
+
+ if (rta->rta_oif || rta->rta_gw) {
+ if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
+ (!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0))
+ return 0;
+ return 1;
+ }
+
+ if (rta->rta_mp == NULL)
+ return 0;
+
+ nhp = RTA_DATA(rta->rta_mp);
+ nhlen = RTA_PAYLOAD(rta->rta_mp);
+
+ for_nexthops(fi) {
+ int attrlen = nhlen - sizeof(struct rtnexthop);
+ dn_address gw;
+
+ if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
+ return -EINVAL;
+ if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
+ return 1;
+ if (attrlen) {
+ gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
+
+ if (gw && gw != nh->nh_gw)
+ return 1;
+ }
+ nhp = RTNH_NEXT(nhp);
+ } endfor_nexthops(fi);
+
+ return 0;
+}
+
+static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
+ u8 tb_id, u8 type, u8 scope, void *dst, int dst_len,
+ struct dn_fib_info *fi)
+{
+ struct rtmsg *rtm;
+ struct nlmsghdr *nlh;
+ unsigned char *b = skb->tail;
+
+ nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*rtm));
+ rtm = NLMSG_DATA(nlh);
+ rtm->rtm_family = AF_DECnet;
+ rtm->rtm_dst_len = dst_len;
+ rtm->rtm_src_len = 0;
+ rtm->rtm_tos = 0;
+ rtm->rtm_table = tb_id;
+ rtm->rtm_flags = fi->fib_flags;
+ rtm->rtm_scope = scope;
+ rtm->rtm_type = type;
+ if (rtm->rtm_dst_len)
+ RTA_PUT(skb, RTA_DST, 2, dst);
+ rtm->rtm_protocol = fi->fib_protocol;
+ if (fi->fib_priority)
+ RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority);
+ if (rtnetlink_put_metrics(skb, fi->fib_metrics) < 0)
+ goto rtattr_failure;
+ if (fi->fib_nhs == 1) {
+ if (fi->fib_nh->nh_gw)
+ RTA_PUT(skb, RTA_GATEWAY, 2, &fi->fib_nh->nh_gw);
+ if (fi->fib_nh->nh_oif)
+ RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif);
+ }
+ if (fi->fib_nhs > 1) {
+ struct rtnexthop *nhp;
+ struct rtattr *mp_head;
+ if (skb_tailroom(skb) <= RTA_SPACE(0))
+ goto rtattr_failure;
+ mp_head = (struct rtattr *)skb_put(skb, RTA_SPACE(0));
+
+ for_nexthops(fi) {
+ if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
+ goto rtattr_failure;
+ nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
+ nhp->rtnh_flags = nh->nh_flags & 0xFF;
+ nhp->rtnh_hops = nh->nh_weight - 1;
+ nhp->rtnh_ifindex = nh->nh_oif;
+ if (nh->nh_gw)
+ RTA_PUT(skb, RTA_GATEWAY, 2, &nh->nh_gw);
+ nhp->rtnh_len = skb->tail - (unsigned char *)nhp;
+ } endfor_nexthops(fi);
+ mp_head->rta_type = RTA_MULTIPATH;
+ mp_head->rta_len = skb->tail - (u8*)mp_head;
+ }
+
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+
+nlmsg_failure:
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+
+static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, int tb_id,
+ struct nlmsghdr *nlh, struct netlink_skb_parms *req)
+{
+ struct sk_buff *skb;
+ u32 pid = req ? req->pid : 0;
+ int size = NLMSG_SPACE(sizeof(struct rtmsg) + 256);
+
+ skb = alloc_skb(size, GFP_KERNEL);
+ if (!skb)
+ return;
+
+ if (dn_fib_dump_info(skb, pid, nlh->nlmsg_seq, event, tb_id,
+ f->fn_type, f->fn_scope, &f->fn_key, z,
+ DN_FIB_INFO(f)) < 0) {
+ kfree_skb(skb);
+ return;
+ }
+ NETLINK_CB(skb).dst_groups = RTMGRP_DECnet_ROUTE;
+ if (nlh->nlmsg_flags & NLM_F_ECHO)
+ atomic_inc(&skb->users);
+ netlink_broadcast(rtnl, skb, pid, RTMGRP_DECnet_ROUTE, GFP_KERNEL);
+ if (nlh->nlmsg_flags & NLM_F_ECHO)
+ netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
+}
+
+static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb,
+ struct netlink_callback *cb,
+ struct dn_fib_table *tb,
+ struct dn_zone *dz,
+ struct dn_fib_node *f)
+{
+ int i, s_i;
+
+ s_i = cb->args[3];
+ for(i = 0; f; i++, f = f->fn_next) {
+ if (i < s_i)
+ continue;
+ if (f->fn_state & DN_S_ZOMBIE)
+ continue;
+ if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWROUTE,
+ tb->n,
+ (f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type,
+ f->fn_scope, &f->fn_key, dz->dz_order,
+ f->fn_info) < 0) {
+ cb->args[3] = i;
+ return -1;
+ }
+ }
+ cb->args[3] = i;
+ return skb->len;
+}
+
+static __inline__ int dn_hash_dump_zone(struct sk_buff *skb,
+ struct netlink_callback *cb,
+ struct dn_fib_table *tb,
+ struct dn_zone *dz)
+{
+ int h, s_h;
+
+ s_h = cb->args[2];
+ for(h = 0; h < dz->dz_divisor; h++) {
+ if (h < s_h)
+ continue;
+ if (h > s_h)
+ memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0]));
+ if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL)
+ continue;
+ if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) {
+ cb->args[2] = h;
+ return -1;
+ }
+ }
+ cb->args[2] = h;
+ return skb->len;
+}
+
+static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ int m, s_m;
+ struct dn_zone *dz;
+ struct dn_hash *table = (struct dn_hash *)tb->data;
+
+ s_m = cb->args[1];
+ read_lock(&dn_fib_tables_lock);
+ for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) {
+ if (m < s_m)
+ continue;
+ if (m > s_m)
+ memset(&cb->args[2], 0, sizeof(cb->args) - 2*sizeof(cb->args[0]));
+
+ if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) {
+ cb->args[1] = m;
+ read_unlock(&dn_fib_tables_lock);
+ return -1;
+ }
+ }
+ read_unlock(&dn_fib_tables_lock);
+ cb->args[1] = m;
+
+ return skb->len;
+}
+
+static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
+{
+ struct dn_hash *table = (struct dn_hash *)tb->data;
+ struct dn_fib_node *new_f, *f, **fp, **del_fp;
+ struct dn_zone *dz;
+ struct dn_fib_info *fi;
+ int z = r->rtm_dst_len;
+ int type = r->rtm_type;
+ dn_fib_key_t key;
+ int err;
+
+ if (z > 16)
+ return -EINVAL;
+
+ dz = table->dh_zones[z];
+ if (!dz && !(dz = dn_new_zone(table, z)))
+ return -ENOBUFS;
+
+ dz_key_0(key);
+ if (rta->rta_dst) {
+ dn_address dst;
+ memcpy(&dst, rta->rta_dst, 2);
+ if (dst & ~DZ_MASK(dz))
+ return -EINVAL;
+ key = dz_key(dst, dz);
+ }
+
+ if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL)
+ return err;
+
+ if (dz->dz_nent > (dz->dz_divisor << 2) &&
+ dz->dz_divisor > DN_MAX_DIVISOR &&
+ (z==16 || (1<<z) > dz->dz_divisor))
+ dn_rehash_zone(dz);
+
+ fp = dn_chain_p(key, dz);
+
+ DN_FIB_SCAN(f, fp) {
+ if (dn_key_leq(key, f->fn_key))
+ break;
+ }
+
+ del_fp = NULL;
+
+ if (f && (f->fn_state & DN_S_ZOMBIE) &&
+ dn_key_eq(f->fn_key, key)) {
+ del_fp = fp;
+ fp = &f->fn_next;
+ f = *fp;
+ goto create;
+ }
+
+ DN_FIB_SCAN_KEY(f, fp, key) {
+ if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority)
+ break;
+ }
+
+ if (f && dn_key_eq(f->fn_key, key) &&
+ fi->fib_priority == DN_FIB_INFO(f)->fib_priority) {
+ struct dn_fib_node **ins_fp;
+
+ err = -EEXIST;
+ if (n->nlmsg_flags & NLM_F_EXCL)
+ goto out;
+
+ if (n->nlmsg_flags & NLM_F_REPLACE) {
+ del_fp = fp;
+ fp = &f->fn_next;
+ f = *fp;
+ goto replace;
+ }
+
+ ins_fp = fp;
+ err = -EEXIST;
+
+ DN_FIB_SCAN_KEY(f, fp, key) {
+ if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority)
+ break;
+ if (f->fn_type == type && f->fn_scope == r->rtm_scope
+ && DN_FIB_INFO(f) == fi)
+ goto out;
+ }
+
+ if (!(n->nlmsg_flags & NLM_F_APPEND)) {
+ fp = ins_fp;
+ f = *fp;
+ }
+ }
+
+create:
+ err = -ENOENT;
+ if (!(n->nlmsg_flags & NLM_F_CREATE))
+ goto out;
+
+replace:
+ err = -ENOBUFS;
+ new_f = kmem_cache_alloc(dn_hash_kmem, SLAB_KERNEL);
+ if (new_f == NULL)
+ goto out;
+
+ memset(new_f, 0, sizeof(struct dn_fib_node));
+
+ new_f->fn_key = key;
+ new_f->fn_type = type;
+ new_f->fn_scope = r->rtm_scope;
+ DN_FIB_INFO(new_f) = fi;
+
+ new_f->fn_next = f;
+ write_lock_bh(&dn_fib_tables_lock);
+ *fp = new_f;
+ write_unlock_bh(&dn_fib_tables_lock);
+ dz->dz_nent++;
+
+ if (del_fp) {
+ f = *del_fp;
+ write_lock_bh(&dn_fib_tables_lock);
+ *del_fp = f->fn_next;
+ write_unlock_bh(&dn_fib_tables_lock);
+
+ if (!(f->fn_state & DN_S_ZOMBIE))
+ dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
+ if (f->fn_state & DN_S_ACCESSED)
+ dn_rt_cache_flush(-1);
+ dn_free_node(f);
+ dz->dz_nent--;
+ } else {
+ dn_rt_cache_flush(-1);
+ }
+
+ dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req);
+
+ return 0;
+out:
+ dn_fib_release_info(fi);
+ return err;
+}
+
+
+static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
+{
+ struct dn_hash *table = (struct dn_hash*)tb->data;
+ struct dn_fib_node **fp, **del_fp, *f;
+ int z = r->rtm_dst_len;
+ struct dn_zone *dz;
+ dn_fib_key_t key;
+ int matched;
+
+
+ if (z > 16)
+ return -EINVAL;
+
+ if ((dz = table->dh_zones[z]) == NULL)
+ return -ESRCH;
+
+ dz_key_0(key);
+ if (rta->rta_dst) {
+ dn_address dst;
+ memcpy(&dst, rta->rta_dst, 2);
+ if (dst & ~DZ_MASK(dz))
+ return -EINVAL;
+ key = dz_key(dst, dz);
+ }
+
+ fp = dn_chain_p(key, dz);
+
+ DN_FIB_SCAN(f, fp) {
+ if (dn_key_eq(f->fn_key, key))
+ break;
+ if (dn_key_leq(key, f->fn_key))
+ return -ESRCH;
+ }
+
+ matched = 0;
+ del_fp = NULL;
+ DN_FIB_SCAN_KEY(f, fp, key) {
+ struct dn_fib_info *fi = DN_FIB_INFO(f);
+
+ if (f->fn_state & DN_S_ZOMBIE)
+ return -ESRCH;
+
+ matched++;
+
+ if (del_fp == NULL &&
+ (!r->rtm_type || f->fn_type == r->rtm_type) &&
+ (r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
+ (!r->rtm_protocol ||
+ fi->fib_protocol == r->rtm_protocol) &&
+ dn_fib_nh_match(r, n, rta, fi) == 0)
+ del_fp = fp;
+ }
+
+ if (del_fp) {
+ f = *del_fp;
+ dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
+
+ if (matched != 1) {
+ write_lock_bh(&dn_fib_tables_lock);
+ *del_fp = f->fn_next;
+ write_unlock_bh(&dn_fib_tables_lock);
+
+ if (f->fn_state & DN_S_ACCESSED)
+ dn_rt_cache_flush(-1);
+ dn_free_node(f);
+ dz->dz_nent--;
+ } else {
+ f->fn_state |= DN_S_ZOMBIE;
+ if (f->fn_state & DN_S_ACCESSED) {
+ f->fn_state &= ~DN_S_ACCESSED;
+ dn_rt_cache_flush(-1);
+ }
+ if (++dn_fib_hash_zombies > 128)
+ dn_fib_flush();
+ }
+
+ return 0;
+ }
+
+ return -ESRCH;
+}
+
+static inline int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table)
+{
+ int found = 0;
+ struct dn_fib_node *f;
+
+ while((f = *fp) != NULL) {
+ struct dn_fib_info *fi = DN_FIB_INFO(f);
+
+ if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) {
+ write_lock_bh(&dn_fib_tables_lock);
+ *fp = f->fn_next;
+ write_unlock_bh(&dn_fib_tables_lock);
+
+ dn_free_node(f);
+ found++;
+ continue;
+ }
+ fp = &f->fn_next;
+ }
+
+ return found;
+}
+
+static int dn_fib_table_flush(struct dn_fib_table *tb)
+{
+ struct dn_hash *table = (struct dn_hash *)tb->data;
+ struct dn_zone *dz;
+ int found = 0;
+
+ dn_fib_hash_zombies = 0;
+ for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
+ int i;
+ int tmp = 0;
+ for(i = dz->dz_divisor-1; i >= 0; i--)
+ tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table);
+ dz->dz_nent -= tmp;
+ found += tmp;
+ }
+
+ return found;
+}
+
+static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct flowi *flp, struct dn_fib_res *res)
+{
+ int err;
+ struct dn_zone *dz;
+ struct dn_hash *t = (struct dn_hash *)tb->data;
+
+ read_lock(&dn_fib_tables_lock);
+ for(dz = t->dh_zone_list; dz; dz = dz->dz_next) {
+ struct dn_fib_node *f;
+ dn_fib_key_t k = dz_key(flp->fld_dst, dz);
+
+ for(f = dz_chain(k, dz); f; f = f->fn_next) {
+ if (!dn_key_eq(k, f->fn_key)) {
+ if (dn_key_leq(k, f->fn_key))
+ break;
+ else
+ continue;
+ }
+
+ f->fn_state |= DN_S_ACCESSED;
+
+ if (f->fn_state&DN_S_ZOMBIE)
+ continue;
+
+ if (f->fn_scope < flp->fld_scope)
+ continue;
+
+ err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), flp, res);
+
+ if (err == 0) {
+ res->type = f->fn_type;
+ res->scope = f->fn_scope;
+ res->prefixlen = dz->dz_order;
+ goto out;
+ }
+ if (err < 0)
+ goto out;
+ }
+ }
+ err = 1;
+out:
+ read_unlock(&dn_fib_tables_lock);
+ return err;
+}
+
+
+struct dn_fib_table *dn_fib_get_table(int n, int create)
+{
+ struct dn_fib_table *t;
+
+ if (n < RT_TABLE_MIN)
+ return NULL;
+
+ if (n > RT_TABLE_MAX)
+ return NULL;
+
+ if (dn_fib_tables[n])
+ return dn_fib_tables[n];
+
+ if (!create)
+ return NULL;
+
+ if (in_interrupt() && net_ratelimit()) {
+ printk(KERN_DEBUG "DECnet: BUG! Attempt to create routing table from interrupt\n");
+ return NULL;
+ }
+ if ((t = kmalloc(sizeof(struct dn_fib_table) + sizeof(struct dn_hash), GFP_KERNEL)) == NULL)
+ return NULL;
+
+ memset(t, 0, sizeof(struct dn_fib_table));
+
+ t->n = n;
+ t->insert = dn_fib_table_insert;
+ t->delete = dn_fib_table_delete;
+ t->lookup = dn_fib_table_lookup;
+ t->flush = dn_fib_table_flush;
+ t->dump = dn_fib_table_dump;
+ memset(t->data, 0, sizeof(struct dn_hash));
+ dn_fib_tables[n] = t;
+
+ return t;
+}
+
+static void dn_fib_del_tree(int n)
+{
+ struct dn_fib_table *t;
+
+ write_lock(&dn_fib_tables_lock);
+ t = dn_fib_tables[n];
+ dn_fib_tables[n] = NULL;
+ write_unlock(&dn_fib_tables_lock);
+
+ if (t) {
+ kfree(t);
+ }
+}
+
+struct dn_fib_table *dn_fib_empty_table(void)
+{
+ int id;
+
+ for(id = RT_TABLE_MIN; id <= RT_TABLE_MAX; id++)
+ if (dn_fib_tables[id] == NULL)
+ return dn_fib_get_table(id, 1);
+ return NULL;
+}
+
+void __init dn_fib_table_init(void)
+{
+ dn_hash_kmem = kmem_cache_create("dn_fib_info_cache",
+ sizeof(struct dn_fib_info),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL, NULL);
+}
+
+void __exit dn_fib_table_cleanup(void)
+{
+ int i;
+
+ for (i = RT_TABLE_MIN; i <= RT_TABLE_MAX; ++i)
+ dn_fib_del_tree(i);
+
+ return;
+}
diff --git a/net/decnet/dn_timer.c b/net/decnet/dn_timer.c
new file mode 100644
index 0000000..0982571
--- /dev/null
+++ b/net/decnet/dn_timer.c
@@ -0,0 +1,109 @@
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Socket Timer Functions
+ *
+ * Author: Steve Whitehouse <SteveW@ACM.org>
+ *
+ *
+ * Changes:
+ * Steve Whitehouse : Made keepalive timer part of the same
+ * timer idea.
+ * Steve Whitehouse : Added checks for sk->sock_readers
+ * David S. Miller : New socket locking
+ * Steve Whitehouse : Timer grabs socket ref.
+ */
+#include <linux/net.h>
+#include <linux/socket.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include <net/sock.h>
+#include <asm/atomic.h>
+#include <net/flow.h>
+#include <net/dn.h>
+
+/*
+ * Slow timer is for everything else (n * 500mS)
+ */
+
+#define SLOW_INTERVAL (HZ/2)
+
+static void dn_slow_timer(unsigned long arg);
+
+void dn_start_slow_timer(struct sock *sk)
+{
+ sk->sk_timer.expires = jiffies + SLOW_INTERVAL;
+ sk->sk_timer.function = dn_slow_timer;
+ sk->sk_timer.data = (unsigned long)sk;
+
+ add_timer(&sk->sk_timer);
+}
+
+void dn_stop_slow_timer(struct sock *sk)
+{
+ del_timer(&sk->sk_timer);
+}
+
+static void dn_slow_timer(unsigned long arg)
+{
+ struct sock *sk = (struct sock *)arg;
+ struct dn_scp *scp = DN_SK(sk);
+
+ sock_hold(sk);
+ bh_lock_sock(sk);
+
+ if (sock_owned_by_user(sk)) {
+ sk->sk_timer.expires = jiffies + HZ / 10;
+ add_timer(&sk->sk_timer);
+ goto out;
+ }
+
+ /*
+ * The persist timer is the standard slow timer used for retransmits
+ * in both connection establishment and disconnection as well as
+ * in the RUN state. The different states are catered for by changing
+ * the function pointer in the socket. Setting the timer to a value
+ * of zero turns it off. We allow the persist_fxn to turn the
+ * timer off in a permant way by returning non-zero, so that
+ * timer based routines may remove sockets. This is why we have a
+ * sock_hold()/sock_put() around the timer to prevent the socket
+ * going away in the middle.
+ */
+ if (scp->persist && scp->persist_fxn) {
+ if (scp->persist <= SLOW_INTERVAL) {
+ scp->persist = 0;
+
+ if (scp->persist_fxn(sk))
+ goto out;
+ } else {
+ scp->persist -= SLOW_INTERVAL;
+ }
+ }
+
+ /*
+ * Check for keepalive timeout. After the other timer 'cos if
+ * the previous timer caused a retransmit, we don't need to
+ * do this. scp->stamp is the last time that we sent a packet.
+ * The keepalive function sends a link service packet to the
+ * other end. If it remains unacknowledged, the standard
+ * socket timers will eventually shut the socket down. Each
+ * time we do this, scp->stamp will be updated, thus
+ * we won't try and send another until scp->keepalive has passed
+ * since the last successful transmission.
+ */
+ if (scp->keepalive && scp->keepalive_fxn && (scp->state == DN_RUN)) {
+ if ((jiffies - scp->stamp) >= scp->keepalive)
+ scp->keepalive_fxn(sk);
+ }
+
+ sk->sk_timer.expires = jiffies + SLOW_INTERVAL;
+
+ add_timer(&sk->sk_timer);
+out:
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}
diff --git a/net/decnet/netfilter/Kconfig b/net/decnet/netfilter/Kconfig
new file mode 100644
index 0000000..ecdb3f9
--- /dev/null
+++ b/net/decnet/netfilter/Kconfig
@@ -0,0 +1,15 @@
+#
+# DECnet netfilter configuration
+#
+
+menu "DECnet: Netfilter Configuration"
+ depends on DECNET && NETFILTER && EXPERIMENTAL
+
+config DECNET_NF_GRABULATOR
+ tristate "Routing message grabulator (for userland routing daemon)"
+ help
+ Enable this module if you want to use the userland DECnet routing
+ daemon. You will also need to enable routing support for DECnet
+ unless you just want to monitor routing messages from other nodes.
+
+endmenu
diff --git a/net/decnet/netfilter/Makefile b/net/decnet/netfilter/Makefile
new file mode 100644
index 0000000..255c1ae
--- /dev/null
+++ b/net/decnet/netfilter/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for DECnet netfilter modules
+#
+
+obj-$(CONFIG_DECNET_NF_GRABULATOR) += dn_rtmsg.o
+
diff --git a/net/decnet/netfilter/dn_rtmsg.c b/net/decnet/netfilter/dn_rtmsg.c
new file mode 100644
index 0000000..f86a625
--- /dev/null
+++ b/net/decnet/netfilter/dn_rtmsg.c
@@ -0,0 +1,167 @@
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet Routing Message Grabulator
+ *
+ * (C) 2000 ChyGwyn Limited - http://www.chygwyn.com/
+ * This code may be copied under the GPL v.2 or at your option
+ * any later version.
+ *
+ * Author: Steven Whitehouse <steve@chygwyn.com>
+ *
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/spinlock.h>
+#include <linux/netlink.h>
+
+#include <net/sock.h>
+#include <net/flow.h>
+#include <net/dn.h>
+#include <net/dn_route.h>
+
+#include <linux/netfilter_decnet.h>
+
+static struct sock *dnrmg = NULL;
+
+
+static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp)
+{
+ struct sk_buff *skb = NULL;
+ size_t size;
+ unsigned char *old_tail;
+ struct nlmsghdr *nlh;
+ unsigned char *ptr;
+ struct nf_dn_rtmsg *rtm;
+
+ size = NLMSG_SPACE(rt_skb->len);
+ size += NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg));
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (!skb)
+ goto nlmsg_failure;
+ old_tail = skb->tail;
+ nlh = NLMSG_PUT(skb, 0, 0, 0, size - sizeof(*nlh));
+ rtm = (struct nf_dn_rtmsg *)NLMSG_DATA(nlh);
+ rtm->nfdn_ifindex = rt_skb->dev->ifindex;
+ ptr = NFDN_RTMSG(rtm);
+ memcpy(ptr, rt_skb->data, rt_skb->len);
+ nlh->nlmsg_len = skb->tail - old_tail;
+ return skb;
+
+nlmsg_failure:
+ if (skb)
+ kfree_skb(skb);
+ *errp = -ENOMEM;
+ if (net_ratelimit())
+ printk(KERN_ERR "dn_rtmsg: error creating netlink message\n");
+ return NULL;
+}
+
+static void dnrmg_send_peer(struct sk_buff *skb)
+{
+ struct sk_buff *skb2;
+ int status = 0;
+ int group = 0;
+ unsigned char flags = *skb->data;
+
+ switch(flags & DN_RT_CNTL_MSK) {
+ case DN_RT_PKT_L1RT:
+ group = DNRMG_L1_GROUP;
+ break;
+ case DN_RT_PKT_L2RT:
+ group = DNRMG_L2_GROUP;
+ break;
+ default:
+ return;
+ }
+
+ skb2 = dnrmg_build_message(skb, &status);
+ if (skb2 == NULL)
+ return;
+ NETLINK_CB(skb2).dst_groups = group;
+ netlink_broadcast(dnrmg, skb2, 0, group, GFP_ATOMIC);
+}
+
+
+static unsigned int dnrmg_hook(unsigned int hook,
+ struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ dnrmg_send_peer(*pskb);
+ return NF_ACCEPT;
+}
+
+
+#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
+
+static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
+{
+ struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
+
+ if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
+ return;
+
+ if (!cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN))
+ RCV_SKB_FAIL(-EPERM);
+
+ /* Eventually we might send routing messages too */
+
+ RCV_SKB_FAIL(-EINVAL);
+}
+
+static void dnrmg_receive_user_sk(struct sock *sk, int len)
+{
+ struct sk_buff *skb;
+
+ while((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+ dnrmg_receive_user_skb(skb);
+ kfree_skb(skb);
+ }
+}
+
+static struct nf_hook_ops dnrmg_ops = {
+ .hook = dnrmg_hook,
+ .pf = PF_DECnet,
+ .hooknum = NF_DN_ROUTE,
+ .priority = NF_DN_PRI_DNRTMSG,
+};
+
+static int __init init(void)
+{
+ int rv = 0;
+
+ dnrmg = netlink_kernel_create(NETLINK_DNRTMSG, dnrmg_receive_user_sk);
+ if (dnrmg == NULL) {
+ printk(KERN_ERR "dn_rtmsg: Cannot create netlink socket");
+ return -ENOMEM;
+ }
+
+ rv = nf_register_hook(&dnrmg_ops);
+ if (rv) {
+ sock_release(dnrmg->sk_socket);
+ }
+
+ return rv;
+}
+
+static void __exit fini(void)
+{
+ nf_unregister_hook(&dnrmg_ops);
+ sock_release(dnrmg->sk_socket);
+}
+
+
+MODULE_DESCRIPTION("DECnet Routing Message Grabulator");
+MODULE_AUTHOR("Steven Whitehouse <steve@chygwyn.com>");
+MODULE_LICENSE("GPL");
+
+module_init(init);
+module_exit(fini);
+
diff --git a/net/decnet/sysctl_net_decnet.c b/net/decnet/sysctl_net_decnet.c
new file mode 100644
index 0000000..02bca49
--- /dev/null
+++ b/net/decnet/sysctl_net_decnet.c
@@ -0,0 +1,480 @@
+/*
+ * DECnet An implementation of the DECnet protocol suite for the LINUX
+ * operating system. DECnet is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * DECnet sysctl support functions
+ *
+ * Author: Steve Whitehouse <SteveW@ACM.org>
+ *
+ *
+ * Changes:
+ * Steve Whitehouse - C99 changes and default device handling
+ *
+ */
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/sysctl.h>
+#include <linux/fs.h>
+#include <linux/netdevice.h>
+#include <linux/string.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+
+#include <asm/uaccess.h>
+
+#include <net/dn.h>
+#include <net/dn_dev.h>
+#include <net/dn_route.h>
+
+
+int decnet_debug_level;
+int decnet_time_wait = 30;
+int decnet_dn_count = 1;
+int decnet_di_count = 3;
+int decnet_dr_count = 3;
+int decnet_log_martians = 1;
+int decnet_no_fc_max_cwnd = NSP_MIN_WINDOW;
+
+#ifdef CONFIG_SYSCTL
+extern int decnet_dst_gc_interval;
+static int min_decnet_time_wait[] = { 5 };
+static int max_decnet_time_wait[] = { 600 };
+static int min_state_count[] = { 1 };
+static int max_state_count[] = { NSP_MAXRXTSHIFT };
+static int min_decnet_dst_gc_interval[] = { 1 };
+static int max_decnet_dst_gc_interval[] = { 60 };
+static int min_decnet_no_fc_max_cwnd[] = { NSP_MIN_WINDOW };
+static int max_decnet_no_fc_max_cwnd[] = { NSP_MAX_WINDOW };
+static char node_name[7] = "???";
+
+static struct ctl_table_header *dn_table_header = NULL;
+
+/*
+ * ctype.h :-)
+ */
+#define ISNUM(x) (((x) >= '0') && ((x) <= '9'))
+#define ISLOWER(x) (((x) >= 'a') && ((x) <= 'z'))
+#define ISUPPER(x) (((x) >= 'A') && ((x) <= 'Z'))
+#define ISALPHA(x) (ISLOWER(x) || ISUPPER(x))
+#define INVALID_END_CHAR(x) (ISNUM(x) || ISALPHA(x))
+
+static void strip_it(char *str)
+{
+ for(;;) {
+ switch(*str) {
+ case ' ':
+ case '\n':
+ case '\r':
+ case ':':
+ *str = 0;
+ case 0:
+ return;
+ }
+ str++;
+ }
+}
+
+/*
+ * Simple routine to parse an ascii DECnet address
+ * into a network order address.
+ */
+static int parse_addr(dn_address *addr, char *str)
+{
+ dn_address area, node;
+
+ while(*str && !ISNUM(*str)) str++;
+
+ if (*str == 0)
+ return -1;
+
+ area = (*str++ - '0');
+ if (ISNUM(*str)) {
+ area *= 10;
+ area += (*str++ - '0');
+ }
+
+ if (*str++ != '.')
+ return -1;
+
+ if (!ISNUM(*str))
+ return -1;
+
+ node = *str++ - '0';
+ if (ISNUM(*str)) {
+ node *= 10;
+ node += (*str++ - '0');
+ }
+ if (ISNUM(*str)) {
+ node *= 10;
+ node += (*str++ - '0');
+ }
+ if (ISNUM(*str)) {
+ node *= 10;
+ node += (*str++ - '0');
+ }
+
+ if ((node > 1023) || (area > 63))
+ return -1;
+
+ if (INVALID_END_CHAR(*str))
+ return -1;
+
+ *addr = dn_htons((area << 10) | node);
+
+ return 0;
+}
+
+
+static int dn_node_address_strategy(ctl_table *table, int __user *name, int nlen,
+ void __user *oldval, size_t __user *oldlenp,
+ void __user *newval, size_t newlen,
+ void **context)
+{
+ size_t len;
+ dn_address addr;
+
+ if (oldval && oldlenp) {
+ if (get_user(len, oldlenp))
+ return -EFAULT;
+ if (len) {
+ if (len != sizeof(unsigned short))
+ return -EINVAL;
+ if (put_user(decnet_address, (unsigned short __user *)oldval))
+ return -EFAULT;
+ }
+ }
+ if (newval && newlen) {
+ if (newlen != sizeof(unsigned short))
+ return -EINVAL;
+ if (get_user(addr, (unsigned short __user *)newval))
+ return -EFAULT;
+
+ dn_dev_devices_off();
+
+ decnet_address = addr;
+
+ dn_dev_devices_on();
+ }
+ return 0;
+}
+
+static int dn_node_address_handler(ctl_table *table, int write,
+ struct file *filp,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ char addr[DN_ASCBUF_LEN];
+ size_t len;
+ dn_address dnaddr;
+
+ if (!*lenp || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ if (write) {
+ int len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
+
+ if (copy_from_user(addr, buffer, len))
+ return -EFAULT;
+
+ addr[len] = 0;
+ strip_it(addr);
+
+ if (parse_addr(&dnaddr, addr))
+ return -EINVAL;
+
+ dn_dev_devices_off();
+
+ decnet_address = dnaddr;
+
+ dn_dev_devices_on();
+
+ *ppos += len;
+
+ return 0;
+ }
+
+ dn_addr2asc(dn_ntohs(decnet_address), addr);
+ len = strlen(addr);
+ addr[len++] = '\n';
+
+ if (len > *lenp) len = *lenp;
+
+ if (copy_to_user(buffer, addr, len))
+ return -EFAULT;
+
+ *lenp = len;
+ *ppos += len;
+
+ return 0;
+}
+
+
+static int dn_def_dev_strategy(ctl_table *table, int __user *name, int nlen,
+ void __user *oldval, size_t __user *oldlenp,
+ void __user *newval, size_t newlen,
+ void **context)
+{
+ size_t len;
+ struct net_device *dev;
+ char devname[17];
+ size_t namel;
+ int rv = 0;
+
+ devname[0] = 0;
+
+ if (oldval && oldlenp) {
+ if (get_user(len, oldlenp))
+ return -EFAULT;
+ if (len) {
+ dev = dn_dev_get_default();
+ if (dev) {
+ strcpy(devname, dev->name);
+ dev_put(dev);
+ }
+
+ namel = strlen(devname) + 1;
+ if (len > namel) len = namel;
+
+ if (copy_to_user(oldval, devname, len))
+ return -EFAULT;
+
+ if (put_user(len, oldlenp))
+ return -EFAULT;
+ }
+ }
+
+ if (newval && newlen) {
+ if (newlen > 16)
+ return -E2BIG;
+
+ if (copy_from_user(devname, newval, newlen))
+ return -EFAULT;
+
+ devname[newlen] = 0;
+
+ dev = dev_get_by_name(devname);
+ if (dev == NULL)
+ return -ENODEV;
+
+ rv = -ENODEV;
+ if (dev->dn_ptr != NULL) {
+ rv = dn_dev_set_default(dev, 1);
+ if (rv)
+ dev_put(dev);
+ }
+ }
+
+ return rv;
+}
+
+
+static int dn_def_dev_handler(ctl_table *table, int write,
+ struct file * filp,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ size_t len;
+ struct net_device *dev;
+ char devname[17];
+
+ if (!*lenp || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ if (write) {
+ if (*lenp > 16)
+ return -E2BIG;
+
+ if (copy_from_user(devname, buffer, *lenp))
+ return -EFAULT;
+
+ devname[*lenp] = 0;
+ strip_it(devname);
+
+ dev = dev_get_by_name(devname);
+ if (dev == NULL)
+ return -ENODEV;
+
+ if (dev->dn_ptr == NULL) {
+ dev_put(dev);
+ return -ENODEV;
+ }
+
+ if (dn_dev_set_default(dev, 1)) {
+ dev_put(dev);
+ return -ENODEV;
+ }
+ *ppos += *lenp;
+
+ return 0;
+ }
+
+ dev = dn_dev_get_default();
+ if (dev == NULL) {
+ *lenp = 0;
+ return 0;
+ }
+
+ strcpy(devname, dev->name);
+ dev_put(dev);
+ len = strlen(devname);
+ devname[len++] = '\n';
+
+ if (len > *lenp) len = *lenp;
+
+ if (copy_to_user(buffer, devname, len))
+ return -EFAULT;
+
+ *lenp = len;
+ *ppos += len;
+
+ return 0;
+}
+
+static ctl_table dn_table[] = {
+ {
+ .ctl_name = NET_DECNET_NODE_ADDRESS,
+ .procname = "node_address",
+ .maxlen = 7,
+ .mode = 0644,
+ .proc_handler = dn_node_address_handler,
+ .strategy = dn_node_address_strategy,
+ },
+ {
+ .ctl_name = NET_DECNET_NODE_NAME,
+ .procname = "node_name",
+ .data = node_name,
+ .maxlen = 7,
+ .mode = 0644,
+ .proc_handler = &proc_dostring,
+ .strategy = &sysctl_string,
+ },
+ {
+ .ctl_name = NET_DECNET_DEFAULT_DEVICE,
+ .procname = "default_device",
+ .maxlen = 16,
+ .mode = 0644,
+ .proc_handler = dn_def_dev_handler,
+ .strategy = dn_def_dev_strategy,
+ },
+ {
+ .ctl_name = NET_DECNET_TIME_WAIT,
+ .procname = "time_wait",
+ .data = &decnet_time_wait,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &min_decnet_time_wait,
+ .extra2 = &max_decnet_time_wait
+ },
+ {
+ .ctl_name = NET_DECNET_DN_COUNT,
+ .procname = "dn_count",
+ .data = &decnet_dn_count,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &min_state_count,
+ .extra2 = &max_state_count
+ },
+ {
+ .ctl_name = NET_DECNET_DI_COUNT,
+ .procname = "di_count",
+ .data = &decnet_di_count,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &min_state_count,
+ .extra2 = &max_state_count
+ },
+ {
+ .ctl_name = NET_DECNET_DR_COUNT,
+ .procname = "dr_count",
+ .data = &decnet_dr_count,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &min_state_count,
+ .extra2 = &max_state_count
+ },
+ {
+ .ctl_name = NET_DECNET_DST_GC_INTERVAL,
+ .procname = "dst_gc_interval",
+ .data = &decnet_dst_gc_interval,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &min_decnet_dst_gc_interval,
+ .extra2 = &max_decnet_dst_gc_interval
+ },
+ {
+ .ctl_name = NET_DECNET_NO_FC_MAX_CWND,
+ .procname = "no_fc_max_cwnd",
+ .data = &decnet_no_fc_max_cwnd,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &min_decnet_no_fc_max_cwnd,
+ .extra2 = &max_decnet_no_fc_max_cwnd
+ },
+ {
+ .ctl_name = NET_DECNET_DEBUG_LEVEL,
+ .procname = "debug",
+ .data = &decnet_debug_level,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ .strategy = &sysctl_intvec,
+ },
+ {0}
+};
+
+static ctl_table dn_dir_table[] = {
+ {
+ .ctl_name = NET_DECNET,
+ .procname = "decnet",
+ .mode = 0555,
+ .child = dn_table},
+ {0}
+};
+
+static ctl_table dn_root_table[] = {
+ {
+ .ctl_name = CTL_NET,
+ .procname = "net",
+ .mode = 0555,
+ .child = dn_dir_table
+ },
+ {0}
+};
+
+void dn_register_sysctl(void)
+{
+ dn_table_header = register_sysctl_table(dn_root_table, 1);
+}
+
+void dn_unregister_sysctl(void)
+{
+ unregister_sysctl_table(dn_table_header);
+}
+
+#else /* CONFIG_SYSCTL */
+void dn_unregister_sysctl(void)
+{
+}
+void dn_register_sysctl(void)
+{
+}
+
+#endif

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