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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/dn_nsp_out.c
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/dn_nsp_out.c')
-rw-r--r--net/decnet/dn_nsp_out.c782
1 files changed, 782 insertions, 0 deletions
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);
+}
+

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