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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/econet
Linux-2.6.12-rc2v2.6.12-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/econet')
-rw-r--r--net/econet/Makefile7
-rw-r--r--net/econet/af_econet.c1129
2 files changed, 1136 insertions, 0 deletions
diff --git a/net/econet/Makefile b/net/econet/Makefile
new file mode 100644
index 000000000000..39f0a77abdbd
--- /dev/null
+++ b/net/econet/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for Econet support code.
+#
+
+obj-$(CONFIG_ECONET) += econet.o
+
+econet-objs := af_econet.o
diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c
new file mode 100644
index 000000000000..de691e119e17
--- /dev/null
+++ b/net/econet/af_econet.c
@@ -0,0 +1,1129 @@
+/*
+ * An implementation of the Acorn Econet and AUN protocols.
+ * Philip Blundell <philb@gnu.org>
+ *
+ * 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 (at your option) any later version.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/route.h>
+#include <linux/inet.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <linux/wireless.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/inet_common.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/if_ec.h>
+#include <net/udp.h>
+#include <net/ip.h>
+#include <linux/spinlock.h>
+#include <linux/rcupdate.h>
+#include <linux/bitops.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+static struct proto_ops econet_ops;
+static struct hlist_head econet_sklist;
+static DEFINE_RWLOCK(econet_lock);
+
+/* Since there are only 256 possible network numbers (or fewer, depends
+ how you count) it makes sense to use a simple lookup table. */
+static struct net_device *net2dev_map[256];
+
+#define EC_PORT_IP 0xd2
+
+#ifdef CONFIG_ECONET_AUNUDP
+static spinlock_t aun_queue_lock;
+static struct socket *udpsock;
+#define AUN_PORT 0x8000
+
+
+struct aunhdr
+{
+ unsigned char code; /* AUN magic protocol byte */
+ unsigned char port;
+ unsigned char cb;
+ unsigned char pad;
+ unsigned long handle;
+};
+
+static unsigned long aun_seq;
+
+/* Queue of packets waiting to be transmitted. */
+static struct sk_buff_head aun_queue;
+static struct timer_list ab_cleanup_timer;
+
+#endif /* CONFIG_ECONET_AUNUDP */
+
+/* Per-packet information */
+struct ec_cb
+{
+ struct sockaddr_ec sec;
+ unsigned long cookie; /* Supplied by user. */
+#ifdef CONFIG_ECONET_AUNUDP
+ int done;
+ unsigned long seq; /* Sequencing */
+ unsigned long timeout; /* Timeout */
+ unsigned long start; /* jiffies */
+#endif
+#ifdef CONFIG_ECONET_NATIVE
+ void (*sent)(struct sk_buff *, int result);
+#endif
+};
+
+static void econet_remove_socket(struct hlist_head *list, struct sock *sk)
+{
+ write_lock_bh(&econet_lock);
+ sk_del_node_init(sk);
+ write_unlock_bh(&econet_lock);
+}
+
+static void econet_insert_socket(struct hlist_head *list, struct sock *sk)
+{
+ write_lock_bh(&econet_lock);
+ sk_add_node(sk, list);
+ write_unlock_bh(&econet_lock);
+}
+
+/*
+ * Pull a packet from our receive queue and hand it to the user.
+ * If necessary we block.
+ */
+
+static int econet_recvmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len, int flags)
+{
+ struct sock *sk = sock->sk;
+ struct sk_buff *skb;
+ size_t copied;
+ int err;
+
+ msg->msg_namelen = sizeof(struct sockaddr_ec);
+
+ /*
+ * Call the generic datagram receiver. This handles all sorts
+ * of horrible races and re-entrancy so we can forget about it
+ * in the protocol layers.
+ *
+ * Now it will return ENETDOWN, if device have just gone down,
+ * but then it will block.
+ */
+
+ skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);
+
+ /*
+ * An error occurred so return it. Because skb_recv_datagram()
+ * handles the blocking we don't see and worry about blocking
+ * retries.
+ */
+
+ if(skb==NULL)
+ goto out;
+
+ /*
+ * You lose any data beyond the buffer you gave. If it worries a
+ * user program they can ask the device for its MTU anyway.
+ */
+
+ copied = skb->len;
+ if (copied > len)
+ {
+ copied=len;
+ msg->msg_flags|=MSG_TRUNC;
+ }
+
+ /* We can't use skb_copy_datagram here */
+ err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
+ if (err)
+ goto out_free;
+ sk->sk_stamp = skb->stamp;
+
+ if (msg->msg_name)
+ memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
+
+ /*
+ * Free or return the buffer as appropriate. Again this
+ * hides all the races and re-entrancy issues from us.
+ */
+ err = copied;
+
+out_free:
+ skb_free_datagram(sk, skb);
+out:
+ return err;
+}
+
+/*
+ * Bind an Econet socket.
+ */
+
+static int econet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+ struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
+ struct sock *sk=sock->sk;
+ struct econet_sock *eo = ec_sk(sk);
+
+ /*
+ * Check legality
+ */
+
+ if (addr_len < sizeof(struct sockaddr_ec) ||
+ sec->sec_family != AF_ECONET)
+ return -EINVAL;
+
+ eo->cb = sec->cb;
+ eo->port = sec->port;
+ eo->station = sec->addr.station;
+ eo->net = sec->addr.net;
+
+ return 0;
+}
+
+#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
+/*
+ * Queue a transmit result for the user to be told about.
+ */
+
+static void tx_result(struct sock *sk, unsigned long cookie, int result)
+{
+ struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
+ struct ec_cb *eb;
+ struct sockaddr_ec *sec;
+
+ if (skb == NULL)
+ {
+ printk(KERN_DEBUG "ec: memory squeeze, transmit result dropped.\n");
+ return;
+ }
+
+ eb = (struct ec_cb *)&skb->cb;
+ sec = (struct sockaddr_ec *)&eb->sec;
+ memset(sec, 0, sizeof(struct sockaddr_ec));
+ sec->cookie = cookie;
+ sec->type = ECTYPE_TRANSMIT_STATUS | result;
+ sec->sec_family = AF_ECONET;
+
+ if (sock_queue_rcv_skb(sk, skb) < 0)
+ kfree_skb(skb);
+}
+#endif
+
+#ifdef CONFIG_ECONET_NATIVE
+/*
+ * Called by the Econet hardware driver when a packet transmit
+ * has completed. Tell the user.
+ */
+
+static void ec_tx_done(struct sk_buff *skb, int result)
+{
+ struct ec_cb *eb = (struct ec_cb *)&skb->cb;
+ tx_result(skb->sk, eb->cookie, result);
+}
+#endif
+
+/*
+ * Send a packet. We have to work out which device it's going out on
+ * and hence whether to use real Econet or the UDP emulation.
+ */
+
+static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len)
+{
+ struct sock *sk = sock->sk;
+ struct sockaddr_ec *saddr=(struct sockaddr_ec *)msg->msg_name;
+ struct net_device *dev;
+ struct ec_addr addr;
+ int err;
+ unsigned char port, cb;
+#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
+ struct sk_buff *skb;
+ struct ec_cb *eb;
+#endif
+#ifdef CONFIG_ECONET_AUNUDP
+ struct msghdr udpmsg;
+ struct iovec iov[msg->msg_iovlen+1];
+ struct aunhdr ah;
+ struct sockaddr_in udpdest;
+ __kernel_size_t size;
+ int i;
+ mm_segment_t oldfs;
+#endif
+
+ /*
+ * Check the flags.
+ */
+
+ if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
+ return -EINVAL;
+
+ /*
+ * Get and verify the address.
+ */
+
+ if (saddr == NULL) {
+ struct econet_sock *eo = ec_sk(sk);
+
+ addr.station = eo->station;
+ addr.net = eo->net;
+ port = eo->port;
+ cb = eo->cb;
+ } else {
+ if (msg->msg_namelen < sizeof(struct sockaddr_ec))
+ return -EINVAL;
+ addr.station = saddr->addr.station;
+ addr.net = saddr->addr.net;
+ port = saddr->port;
+ cb = saddr->cb;
+ }
+
+ /* Look for a device with the right network number. */
+ dev = net2dev_map[addr.net];
+
+ /* If not directly reachable, use some default */
+ if (dev == NULL)
+ {
+ dev = net2dev_map[0];
+ /* No interfaces at all? */
+ if (dev == NULL)
+ return -ENETDOWN;
+ }
+
+ if (len + 15 > dev->mtu)
+ return -EMSGSIZE;
+
+ if (dev->type == ARPHRD_ECONET)
+ {
+ /* Real hardware Econet. We're not worthy etc. */
+#ifdef CONFIG_ECONET_NATIVE
+ unsigned short proto = 0;
+
+ dev_hold(dev);
+
+ skb = sock_alloc_send_skb(sk, len+LL_RESERVED_SPACE(dev),
+ msg->msg_flags & MSG_DONTWAIT, &err);
+ if (skb==NULL)
+ goto out_unlock;
+
+ skb_reserve(skb, LL_RESERVED_SPACE(dev));
+ skb->nh.raw = skb->data;
+
+ eb = (struct ec_cb *)&skb->cb;
+
+ /* BUG: saddr may be NULL */
+ eb->cookie = saddr->cookie;
+ eb->sec = *saddr;
+ eb->sent = ec_tx_done;
+
+ if (dev->hard_header) {
+ int res;
+ struct ec_framehdr *fh;
+ err = -EINVAL;
+ res = dev->hard_header(skb, dev, ntohs(proto),
+ &addr, NULL, len);
+ /* Poke in our control byte and
+ port number. Hack, hack. */
+ fh = (struct ec_framehdr *)(skb->data);
+ fh->cb = cb;
+ fh->port = port;
+ if (sock->type != SOCK_DGRAM) {
+ skb->tail = skb->data;
+ skb->len = 0;
+ } else if (res < 0)
+ goto out_free;
+ }
+
+ /* Copy the data. Returns -EFAULT on error */
+ err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
+ skb->protocol = proto;
+ skb->dev = dev;
+ skb->priority = sk->sk_priority;
+ if (err)
+ goto out_free;
+
+ err = -ENETDOWN;
+ if (!(dev->flags & IFF_UP))
+ goto out_free;
+
+ /*
+ * Now send it
+ */
+
+ dev_queue_xmit(skb);
+ dev_put(dev);
+ return(len);
+
+ out_free:
+ kfree_skb(skb);
+ out_unlock:
+ if (dev)
+ dev_put(dev);
+#else
+ err = -EPROTOTYPE;
+#endif
+ return err;
+ }
+
+#ifdef CONFIG_ECONET_AUNUDP
+ /* AUN virtual Econet. */
+
+ if (udpsock == NULL)
+ return -ENETDOWN; /* No socket - can't send */
+
+ /* Make up a UDP datagram and hand it off to some higher intellect. */
+
+ memset(&udpdest, 0, sizeof(udpdest));
+ udpdest.sin_family = AF_INET;
+ udpdest.sin_port = htons(AUN_PORT);
+
+ /* At the moment we use the stupid Acorn scheme of Econet address
+ y.x maps to IP a.b.c.x. This should be replaced with something
+ more flexible and more aware of subnet masks. */
+ {
+ struct in_device *idev;
+ unsigned long network = 0;
+
+ rcu_read_lock();
+ idev = __in_dev_get(dev);
+ if (idev) {
+ if (idev->ifa_list)
+ network = ntohl(idev->ifa_list->ifa_address) &
+ 0xffffff00; /* !!! */
+ }
+ rcu_read_unlock();
+ udpdest.sin_addr.s_addr = htonl(network | addr.station);
+ }
+
+ ah.port = port;
+ ah.cb = cb & 0x7f;
+ ah.code = 2; /* magic */
+ ah.pad = 0;
+
+ /* tack our header on the front of the iovec */
+ size = sizeof(struct aunhdr);
+ /*
+ * XXX: that is b0rken. We can't mix userland and kernel pointers
+ * in iovec, since on a lot of platforms copy_from_user() will
+ * *not* work with the kernel and userland ones at the same time,
+ * regardless of what we do with set_fs(). And we are talking about
+ * econet-over-ethernet here, so "it's only ARM anyway" doesn't
+ * apply. Any suggestions on fixing that code? -- AV
+ */
+ iov[0].iov_base = (void *)&ah;
+ iov[0].iov_len = size;
+ for (i = 0; i < msg->msg_iovlen; i++) {
+ void __user *base = msg->msg_iov[i].iov_base;
+ size_t len = msg->msg_iov[i].iov_len;
+ /* Check it now since we switch to KERNEL_DS later. */
+ if (!access_ok(VERIFY_READ, base, len))
+ return -EFAULT;
+ iov[i+1].iov_base = base;
+ iov[i+1].iov_len = len;
+ size += len;
+ }
+
+ /* Get a skbuff (no data, just holds our cb information) */
+ if ((skb = sock_alloc_send_skb(sk, 0,
+ msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
+ return err;
+
+ eb = (struct ec_cb *)&skb->cb;
+
+ eb->cookie = saddr->cookie;
+ eb->timeout = (5*HZ);
+ eb->start = jiffies;
+ ah.handle = aun_seq;
+ eb->seq = (aun_seq++);
+ eb->sec = *saddr;
+
+ skb_queue_tail(&aun_queue, skb);
+
+ udpmsg.msg_name = (void *)&udpdest;
+ udpmsg.msg_namelen = sizeof(udpdest);
+ udpmsg.msg_iov = &iov[0];
+ udpmsg.msg_iovlen = msg->msg_iovlen + 1;
+ udpmsg.msg_control = NULL;
+ udpmsg.msg_controllen = 0;
+ udpmsg.msg_flags=0;
+
+ oldfs = get_fs(); set_fs(KERNEL_DS); /* More privs :-) */
+ err = sock_sendmsg(udpsock, &udpmsg, size);
+ set_fs(oldfs);
+#else
+ err = -EPROTOTYPE;
+#endif
+ return err;
+}
+
+/*
+ * Look up the address of a socket.
+ */
+
+static int econet_getname(struct socket *sock, struct sockaddr *uaddr,
+ int *uaddr_len, int peer)
+{
+ struct sock *sk = sock->sk;
+ struct econet_sock *eo = ec_sk(sk);
+ struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
+
+ if (peer)
+ return -EOPNOTSUPP;
+
+ sec->sec_family = AF_ECONET;
+ sec->port = eo->port;
+ sec->addr.station = eo->station;
+ sec->addr.net = eo->net;
+
+ *uaddr_len = sizeof(*sec);
+ return 0;
+}
+
+static void econet_destroy_timer(unsigned long data)
+{
+ struct sock *sk=(struct sock *)data;
+
+ if (!atomic_read(&sk->sk_wmem_alloc) &&
+ !atomic_read(&sk->sk_rmem_alloc)) {
+ sk_free(sk);
+ return;
+ }
+
+ sk->sk_timer.expires = jiffies + 10 * HZ;
+ add_timer(&sk->sk_timer);
+ printk(KERN_DEBUG "econet socket destroy delayed\n");
+}
+
+/*
+ * Close an econet socket.
+ */
+
+static int econet_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ if (!sk)
+ return 0;
+
+ econet_remove_socket(&econet_sklist, sk);
+
+ /*
+ * Now the socket is dead. No more input will appear.
+ */
+
+ sk->sk_state_change(sk); /* It is useless. Just for sanity. */
+
+ sock->sk = NULL;
+ sk->sk_socket = NULL;
+ sock_set_flag(sk, SOCK_DEAD);
+
+ /* Purge queues */
+
+ skb_queue_purge(&sk->sk_receive_queue);
+
+ if (atomic_read(&sk->sk_rmem_alloc) ||
+ atomic_read(&sk->sk_wmem_alloc)) {
+ sk->sk_timer.data = (unsigned long)sk;
+ sk->sk_timer.expires = jiffies + HZ;
+ sk->sk_timer.function = econet_destroy_timer;
+ add_timer(&sk->sk_timer);
+ return 0;
+ }
+
+ sk_free(sk);
+ return 0;
+}
+
+static struct proto econet_proto = {
+ .name = "ECONET",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct econet_sock),
+};
+
+/*
+ * Create an Econet socket
+ */
+
+static int econet_create(struct socket *sock, int protocol)
+{
+ struct sock *sk;
+ struct econet_sock *eo;
+ int err;
+
+ /* Econet only provides datagram services. */
+ if (sock->type != SOCK_DGRAM)
+ return -ESOCKTNOSUPPORT;
+
+ sock->state = SS_UNCONNECTED;
+
+ err = -ENOBUFS;
+ sk = sk_alloc(PF_ECONET, GFP_KERNEL, &econet_proto, 1);
+ if (sk == NULL)
+ goto out;
+
+ sk->sk_reuse = 1;
+ sock->ops = &econet_ops;
+ sock_init_data(sock, sk);
+
+ eo = ec_sk(sk);
+ sock_reset_flag(sk, SOCK_ZAPPED);
+ sk->sk_family = PF_ECONET;
+ eo->num = protocol;
+
+ econet_insert_socket(&econet_sklist, sk);
+ return(0);
+out:
+ return err;
+}
+
+/*
+ * Handle Econet specific ioctls
+ */
+
+static int ec_dev_ioctl(struct socket *sock, unsigned int cmd, void __user *arg)
+{
+ struct ifreq ifr;
+ struct ec_device *edev;
+ struct net_device *dev;
+ struct sockaddr_ec *sec;
+
+ /*
+ * Fetch the caller's info block into kernel space
+ */
+
+ if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
+ return -EFAULT;
+
+ if ((dev = dev_get_by_name(ifr.ifr_name)) == NULL)
+ return -ENODEV;
+
+ sec = (struct sockaddr_ec *)&ifr.ifr_addr;
+
+ switch (cmd)
+ {
+ case SIOCSIFADDR:
+ edev = dev->ec_ptr;
+ if (edev == NULL)
+ {
+ /* Magic up a new one. */
+ edev = kmalloc(sizeof(struct ec_device), GFP_KERNEL);
+ if (edev == NULL) {
+ printk("af_ec: memory squeeze.\n");
+ dev_put(dev);
+ return -ENOMEM;
+ }
+ memset(edev, 0, sizeof(struct ec_device));
+ dev->ec_ptr = edev;
+ }
+ else
+ net2dev_map[edev->net] = NULL;
+ edev->station = sec->addr.station;
+ edev->net = sec->addr.net;
+ net2dev_map[sec->addr.net] = dev;
+ if (!net2dev_map[0])
+ net2dev_map[0] = dev;
+ dev_put(dev);
+ return 0;
+
+ case SIOCGIFADDR:
+ edev = dev->ec_ptr;
+ if (edev == NULL)
+ {
+ dev_put(dev);
+ return -ENODEV;
+ }
+ memset(sec, 0, sizeof(struct sockaddr_ec));
+ sec->addr.station = edev->station;
+ sec->addr.net = edev->net;
+ sec->sec_family = AF_ECONET;
+ dev_put(dev);
+ if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
+ return -EFAULT;
+ return 0;
+ }
+
+ dev_put(dev);
+ return -EINVAL;
+}
+
+/*
+ * Handle generic ioctls
+ */
+
+static int econet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ struct sock *sk = sock->sk;
+ void __user *argp = (void __user *)arg;
+
+ switch(cmd) {
+ case SIOCGSTAMP:
+ return sock_get_timestamp(sk, argp);
+
+ case SIOCSIFADDR:
+ case SIOCGIFADDR:
+ return ec_dev_ioctl(sock, cmd, argp);
+ break;
+
+ default:
+ return dev_ioctl(cmd, argp);
+ }
+ /*NOTREACHED*/
+ return 0;
+}
+
+static struct net_proto_family econet_family_ops = {
+ .family = PF_ECONET,
+ .create = econet_create,
+ .owner = THIS_MODULE,
+};
+
+static struct proto_ops SOCKOPS_WRAPPED(econet_ops) = {
+ .family = PF_ECONET,
+ .owner = THIS_MODULE,
+ .release = econet_release,
+ .bind = econet_bind,
+ .connect = sock_no_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = econet_getname,
+ .poll = datagram_poll,
+ .ioctl = econet_ioctl,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = sock_no_setsockopt,
+ .getsockopt = sock_no_getsockopt,
+ .sendmsg = econet_sendmsg,
+ .recvmsg = econet_recvmsg,
+ .mmap = sock_no_mmap,
+ .sendpage = sock_no_sendpage,
+};
+
+#include <linux/smp_lock.h>
+SOCKOPS_WRAP(econet, PF_ECONET);
+
+#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
+/*
+ * Find the listening socket, if any, for the given data.
+ */
+
+static struct sock *ec_listening_socket(unsigned char port, unsigned char
+ station, unsigned char net)
+{
+ struct sock *sk;
+ struct hlist_node *node;
+
+ sk_for_each(sk, node, &econet_sklist) {
+ struct econet_sock *opt = ec_sk(sk);
+ if ((opt->port == port || opt->port == 0) &&
+ (opt->station == station || opt->station == 0) &&
+ (opt->net == net || opt->net == 0))
+ goto found;
+ }
+ sk = NULL;
+found:
+ return sk;
+}
+
+/*
+ * Queue a received packet for a socket.
+ */
+
+static int ec_queue_packet(struct sock *sk, struct sk_buff *skb,
+ unsigned char stn, unsigned char net,
+ unsigned char cb, unsigned char port)
+{
+ struct ec_cb *eb = (struct ec_cb *)&skb->cb;
+ struct sockaddr_ec *sec = (struct sockaddr_ec *)&eb->sec;
+
+ memset(sec, 0, sizeof(struct sockaddr_ec));
+ sec->sec_family = AF_ECONET;
+ sec->type = ECTYPE_PACKET_RECEIVED;
+ sec->port = port;
+ sec->cb = cb;
+ sec->addr.net = net;
+ sec->addr.station = stn;
+
+ return sock_queue_rcv_skb(sk, skb);
+}
+#endif
+
+#ifdef CONFIG_ECONET_AUNUDP
+/*
+ * Send an AUN protocol response.
+ */
+
+static void aun_send_response(__u32 addr, unsigned long seq, int code, int cb)
+{
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ .sin_port = htons(AUN_PORT),
+ .sin_addr = {.s_addr = addr}
+ };
+ struct aunhdr ah = {.code = code, .cb = cb, .handle = seq};
+ struct kvec iov = {.iov_base = (void *)&ah, .iov_len = sizeof(ah)};
+ struct msghdr udpmsg;
+
+ udpmsg.msg_name = (void *)&sin;
+ udpmsg.msg_namelen = sizeof(sin);
+ udpmsg.msg_control = NULL;
+ udpmsg.msg_controllen = 0;
+ udpmsg.msg_flags=0;
+
+ kernel_sendmsg(udpsock, &udpmsg, &iov, 1, sizeof(ah));
+}
+
+
+/*
+ * Handle incoming AUN packets. Work out if anybody wants them,
+ * and send positive or negative acknowledgements as appropriate.
+ */
+
+static void aun_incoming(struct sk_buff *skb, struct aunhdr *ah, size_t len)
+{
+ struct iphdr *ip = skb->nh.iph;
+ unsigned char stn = ntohl(ip->saddr) & 0xff;
+ struct sock *sk;
+ struct sk_buff *newskb;
+ struct ec_device *edev = skb->dev->ec_ptr;
+
+ if (! edev)
+ goto bad;
+
+ if ((sk = ec_listening_socket(ah->port, stn, edev->net)) == NULL)
+ goto bad; /* Nobody wants it */
+
+ newskb = alloc_skb((len - sizeof(struct aunhdr) + 15) & ~15,
+ GFP_ATOMIC);
+ if (newskb == NULL)
+ {
+ printk(KERN_DEBUG "AUN: memory squeeze, dropping packet.\n");
+ /* Send nack and hope sender tries again */
+ goto bad;
+ }
+
+ memcpy(skb_put(newskb, len - sizeof(struct aunhdr)), (void *)(ah+1),
+ len - sizeof(struct aunhdr));
+
+ if (ec_queue_packet(sk, newskb, stn, edev->net, ah->cb, ah->port))
+ {
+ /* Socket is bankrupt. */
+ kfree_skb(newskb);
+ goto bad;
+ }
+
+ aun_send_response(ip->saddr, ah->handle, 3, 0);
+ return;
+
+bad:
+ aun_send_response(ip->saddr, ah->handle, 4, 0);
+}
+
+/*
+ * Handle incoming AUN transmit acknowledgements. If the sequence
+ * number matches something in our backlog then kill it and tell
+ * the user. If the remote took too long to reply then we may have
+ * dropped the packet already.
+ */
+
+static void aun_tx_ack(unsigned long seq, int result)
+{
+ struct sk_buff *skb;
+ unsigned long flags;
+ struct ec_cb *eb;
+
+ spin_lock_irqsave(&aun_queue_lock, flags);
+ skb = skb_peek(&aun_queue);
+ while (skb && skb != (struct sk_buff *)&aun_queue)
+ {
+ struct sk_buff *newskb = skb->next;
+ eb = (struct ec_cb *)&skb->cb;
+ if (eb->seq == seq)
+ goto foundit;
+
+ skb = newskb;
+ }
+ spin_unlock_irqrestore(&aun_queue_lock, flags);
+ printk(KERN_DEBUG "AUN: unknown sequence %ld\n", seq);
+ return;
+
+foundit:
+ tx_result(skb->sk, eb->cookie, result);
+ skb_unlink(skb);
+ spin_unlock_irqrestore(&aun_queue_lock, flags);
+ kfree_skb(skb);
+}
+
+/*
+ * Deal with received AUN frames - sort out what type of thing it is
+ * and hand it to the right function.
+ */
+
+static void aun_data_available(struct sock *sk, int slen)
+{
+ int err;
+ struct sk_buff *skb;
+ unsigned char *data;
+ struct aunhdr *ah;
+ struct iphdr *ip;
+ size_t len;
+
+ while ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) {
+ if (err == -EAGAIN) {
+ printk(KERN_ERR "AUN: no data available?!");
+ return;
+ }
+ printk(KERN_DEBUG "AUN: recvfrom() error %d\n", -err);
+ }
+
+ data = skb->h.raw + sizeof(struct udphdr);
+ ah = (struct aunhdr *)data;
+ len = skb->len - sizeof(struct udphdr);
+ ip = skb->nh.iph;
+
+ switch (ah->code)
+ {
+ case 2:
+ aun_incoming(skb, ah, len);
+ break;
+ case 3:
+ aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_OK);
+ break;
+ case 4:
+ aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_NOT_LISTENING);
+ break;
+#if 0
+ /* This isn't quite right yet. */
+ case 5:
+ aun_send_response(ip->saddr, ah->handle, 6, ah->cb);
+ break;
+#endif
+ default:
+ printk(KERN_DEBUG "unknown AUN packet (type %d)\n", data[0]);
+ }
+
+ skb_free_datagram(sk, skb);
+}
+
+/*
+ * Called by the timer to manage the AUN transmit queue. If a packet
+ * was sent to a dead or nonexistent host then we will never get an
+ * acknowledgement back. After a few seconds we need to spot this and
+ * drop the packet.
+ */
+
+static void ab_cleanup(unsigned long h)
+{
+ struct sk_buff *skb;
+ unsigned long flags;
+
+ spin_lock_irqsave(&aun_queue_lock, flags);
+ skb = skb_peek(&aun_queue);
+ while (skb && skb != (struct sk_buff *)&aun_queue)
+ {
+ struct sk_buff *newskb = skb->next;
+ struct ec_cb *eb = (struct ec_cb *)&skb->cb;
+ if ((jiffies - eb->start) > eb->timeout)
+ {
+ tx_result(skb->sk, eb->cookie,
+ ECTYPE_TRANSMIT_NOT_PRESENT);
+ skb_unlink(skb);
+ kfree_skb(skb);
+ }
+ skb = newskb;
+ }
+ spin_unlock_irqrestore(&aun_queue_lock, flags);
+
+ mod_timer(&ab_cleanup_timer, jiffies + (HZ*2));
+}
+
+static int __init aun_udp_initialise(void)
+{
+ int error;
+ struct sockaddr_in sin;
+
+ skb_queue_head_init(&aun_queue);
+ spin_lock_init(&aun_queue_lock);
+ init_timer(&ab_cleanup_timer);
+ ab_cleanup_timer.expires = jiffies + (HZ*2);
+ ab_cleanup_timer.function = ab_cleanup;
+ add_timer(&ab_cleanup_timer);
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_port = htons(AUN_PORT);
+
+ /* We can count ourselves lucky Acorn machines are too dim to
+ speak IPv6. :-) */
+ if ((error = sock_create_kern(PF_INET, SOCK_DGRAM, 0, &udpsock)) < 0)
+ {
+ printk("AUN: socket error %d\n", -error);
+ return error;
+ }
+
+ udpsock->sk->sk_reuse = 1;
+ udpsock->sk->sk_allocation = GFP_ATOMIC; /* we're going to call it
+ from interrupts */
+
+ error = udpsock->ops->bind(udpsock, (struct sockaddr *)&sin,
+ sizeof(sin));
+ if (error < 0)
+ {
+ printk("AUN: bind error %d\n", -error);
+ goto release;
+ }
+
+ udpsock->sk->sk_data_ready = aun_data_available;
+
+ return 0;
+
+release:
+ sock_release(udpsock);
+ udpsock = NULL;
+ return error;
+}
+#endif
+
+#ifdef CONFIG_ECONET_NATIVE
+
+/*
+ * Receive an Econet frame from a device.
+ */
+
+static int econet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
+{
+ struct ec_framehdr *hdr;
+ struct sock *sk;
+ struct ec_device *edev = dev->ec_ptr;
+
+ if (skb->pkt_type == PACKET_OTHERHOST)
+ goto drop;
+
+ if (!edev)
+ goto drop;
+
+ if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
+ return NET_RX_DROP;
+
+ if (!pskb_may_pull(skb, sizeof(struct ec_framehdr)))
+ goto drop;
+
+ hdr = (struct ec_framehdr *) skb->data;
+
+ /* First check for encapsulated IP */
+ if (hdr->port == EC_PORT_IP) {
+ skb->protocol = htons(ETH_P_IP);
+ skb_pull(skb, sizeof(struct ec_framehdr));
+ netif_rx(skb);
+ return 0;
+ }
+
+ sk = ec_listening_socket(hdr->port, hdr->src_stn, hdr->src_net);
+ if (!sk)
+ goto drop;
+
+ if (ec_queue_packet(sk, skb, edev->net, hdr->src_stn, hdr->cb,
+ hdr->port))
+ goto drop;
+
+ return 0;
+
+drop:
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+
+static struct packet_type econet_packet_type = {
+ .type = __constant_htons(ETH_P_ECONET),
+ .func = econet_rcv,
+};
+
+static void econet_hw_initialise(void)
+{
+ dev_add_pack(&econet_packet_type);
+}
+
+#endif
+
+static int econet_notifier(struct notifier_block *this, unsigned long msg, void *data)
+{
+ struct net_device *dev = (struct net_device *)data;
+ struct ec_device *edev;
+
+ switch (msg) {
+ case NETDEV_UNREGISTER:
+ /* A device has gone down - kill any data we hold for it. */
+ edev = dev->ec_ptr;
+ if (edev)
+ {
+ if (net2dev_map[0] == dev)
+ net2dev_map[0] = NULL;
+ net2dev_map[edev->net] = NULL;
+ kfree(edev);
+ dev->ec_ptr = NULL;
+ }
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block econet_netdev_notifier = {
+ .notifier_call =econet_notifier,
+};
+
+static void __exit econet_proto_exit(void)
+{
+#ifdef CONFIG_ECONET_AUNUDP
+ del_timer(&ab_cleanup_timer);
+ if (udpsock)
+ sock_release(udpsock);
+#endif
+ unregister_netdevice_notifier(&econet_netdev_notifier);
+ sock_unregister(econet_family_ops.family);
+ proto_unregister(&econet_proto);
+}
+
+static int __init econet_proto_init(void)
+{
+ int err = proto_register(&econet_proto, 0);
+
+ if (err != 0)
+ goto out;
+ sock_register(&econet_family_ops);
+#ifdef CONFIG_ECONET_AUNUDP
+ spin_lock_init(&aun_queue_lock);
+ aun_udp_initialise();
+#endif
+#ifdef CONFIG_ECONET_NATIVE
+ econet_hw_initialise();
+#endif
+ register_netdevice_notifier(&econet_netdev_notifier);
+out:
+ return err;
+}
+
+module_init(econet_proto_init);
+module_exit(econet_proto_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_ECONET);

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