+++ /dev/null
-/*
- * 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.
- *
- */
-
-#define pr_fmt(fmt) fmt
-
-#include <linux/module.h>
-
-#include <linux/types.h>
-#include <linux/kernel.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 <linux/udp.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.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 <linux/mutex.h>
-
-#include <linux/uaccess.h>
-
-static const struct proto_ops econet_ops;
-static struct hlist_head econet_sklist;
-static DEFINE_SPINLOCK(econet_lock);
-static DEFINE_MUTEX(econet_mutex);
-
-/* 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 DEFINE_SPINLOCK(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)
-{
- spin_lock_bh(&econet_lock);
- sk_del_node_init(sk);
- spin_unlock_bh(&econet_lock);
-}
-
-static void econet_insert_socket(struct hlist_head *list, struct sock *sk)
-{
- spin_lock_bh(&econet_lock);
- sk_add_node(sk, list);
- spin_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);
-
- mutex_lock(&econet_mutex);
-
- /*
- * 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->tstamp;
-
- 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:
- mutex_unlock(&econet_mutex);
- 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;
- struct econet_sock *eo;
-
- /*
- * Check legality
- */
-
- if (addr_len < sizeof(struct sockaddr_ec) ||
- sec->sec_family != AF_ECONET)
- return -EINVAL;
-
- mutex_lock(&econet_mutex);
-
- sk = sock->sk;
- eo = ec_sk(sk);
-
- eo->cb = sec->cb;
- eo->port = sec->port;
- eo->station = sec->addr.station;
- eo->net = sec->addr.net;
-
- mutex_unlock(&econet_mutex);
-
- 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) {
- pr_debug("econet: 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 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 sock *sk = sock->sk;
- struct sk_buff *skb;
- struct ec_cb *eb;
-#endif
-#ifdef CONFIG_ECONET_AUNUDP
- struct msghdr udpmsg;
- struct iovec iov[2];
- struct aunhdr ah;
- struct sockaddr_in udpdest;
- __kernel_size_t size;
- mm_segment_t oldfs;
- char *userbuf;
-#endif
-
- /*
- * Check the flags.
- */
-
- if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
- return -EINVAL;
-
- /*
- * Get and verify the address.
- */
-
- mutex_lock(&econet_mutex);
-
- if (saddr == NULL || msg->msg_namelen < sizeof(struct sockaddr_ec)) {
- mutex_unlock(&econet_mutex);
- 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) {
- mutex_unlock(&econet_mutex);
- return -ENETDOWN;
- }
- }
-
- if (dev->type == ARPHRD_ECONET) {
- /* Real hardware Econet. We're not worthy etc. */
-#ifdef CONFIG_ECONET_NATIVE
- unsigned short proto = 0;
- int hlen, tlen;
- int res;
-
- if (len + 15 > dev->mtu) {
- mutex_unlock(&econet_mutex);
- return -EMSGSIZE;
- }
-
- dev_hold(dev);
-
- hlen = LL_RESERVED_SPACE(dev);
- tlen = dev->needed_tailroom;
- skb = sock_alloc_send_skb(sk, len + hlen + tlen,
- msg->msg_flags & MSG_DONTWAIT, &err);
- if (skb == NULL)
- goto out_unlock;
-
- skb_reserve(skb, hlen);
- skb_reset_network_header(skb);
-
- eb = (struct ec_cb *)&skb->cb;
-
- eb->cookie = saddr->cookie;
- eb->sec = *saddr;
- eb->sent = ec_tx_done;
-
- err = -EINVAL;
- res = dev_hard_header(skb, dev, ntohs(proto), &addr, NULL, len);
- if (res < 0)
- goto out_free;
- if (res > 0) {
- struct ec_framehdr *fh;
- /* 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_reset_tail_pointer(skb);
- skb->len = 0;
- }
- }
-
- /* 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);
- mutex_unlock(&econet_mutex);
- return len;
-
-out_free:
- kfree_skb(skb);
-out_unlock:
- if (dev)
- dev_put(dev);
-#else
- err = -EPROTOTYPE;
-#endif
- mutex_unlock(&econet_mutex);
-
- return err;
- }
-
-#ifdef CONFIG_ECONET_AUNUDP
- /* AUN virtual Econet. */
-
- if (udpsock == NULL) {
- mutex_unlock(&econet_mutex);
- return -ENETDOWN; /* No socket - can't send */
- }
-
- if (len > 32768) {
- err = -E2BIG;
- goto error;
- }
-
- /* 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_rcu(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);
- }
-
- memset(&ah, 0, sizeof(ah));
- ah.port = port;
- ah.cb = cb & 0x7f;
- ah.code = 2; /* magic */
-
- /* tack our header on the front of the iovec */
- size = sizeof(struct aunhdr);
- iov[0].iov_base = (void *)&ah;
- iov[0].iov_len = size;
-
- userbuf = vmalloc(len);
- if (userbuf == NULL) {
- err = -ENOMEM;
- goto error;
- }
-
- iov[1].iov_base = userbuf;
- iov[1].iov_len = len;
- err = memcpy_fromiovec(userbuf, msg->msg_iov, len);
- if (err)
- goto error_free_buf;
-
- /* Get a skbuff (no data, just holds our cb information) */
- skb = sock_alloc_send_skb(sk, 0, msg->msg_flags & MSG_DONTWAIT, &err);
- if (skb == NULL)
- goto error_free_buf;
-
- 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 = 2;
- 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);
-
-error_free_buf:
- vfree(userbuf);
-error:
-#else
- err = -EPROTOTYPE;
-#endif
- mutex_unlock(&econet_mutex);
-
- 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;
- struct econet_sock *eo;
- struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
-
- if (peer)
- return -EOPNOTSUPP;
-
- memset(sec, 0, sizeof(*sec));
- mutex_lock(&econet_mutex);
-
- sk = sock->sk;
- eo = ec_sk(sk);
-
- sec->sec_family = AF_ECONET;
- sec->port = eo->port;
- sec->addr.station = eo->station;
- sec->addr.net = eo->net;
-
- mutex_unlock(&econet_mutex);
-
- *uaddr_len = sizeof(*sec);
- return 0;
-}
-
-static void econet_destroy_timer(unsigned long data)
-{
- struct sock *sk = (struct sock *)data;
-
- if (!sk_has_allocations(sk)) {
- sk_free(sk);
- return;
- }
-
- sk->sk_timer.expires = jiffies + 10 * HZ;
- add_timer(&sk->sk_timer);
- pr_debug("econet: socket destroy delayed\n");
-}
-
-/*
- * Close an econet socket.
- */
-
-static int econet_release(struct socket *sock)
-{
- struct sock *sk;
-
- mutex_lock(&econet_mutex);
-
- sk = sock->sk;
- if (!sk)
- goto out_unlock;
-
- 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_orphan(sk);
-
- /* Purge queues */
-
- skb_queue_purge(&sk->sk_receive_queue);
-
- if (sk_has_allocations(sk)) {
- 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);
-
- goto out_unlock;
- }
-
- sk_free(sk);
-
-out_unlock:
- mutex_unlock(&econet_mutex);
- 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 net *net, struct socket *sock, int protocol,
- int kern)
-{
- struct sock *sk;
- struct econet_sock *eo;
- int err;
-
- if (!net_eq(net, &init_net))
- return -EAFNOSUPPORT;
-
- /* Econet only provides datagram services. */
- if (sock->type != SOCK_DGRAM)
- return -ESOCKTNOSUPPORT;
-
- sock->state = SS_UNCONNECTED;
-
- err = -ENOBUFS;
- sk = sk_alloc(net, PF_ECONET, GFP_KERNEL, &econet_proto);
- if (sk == NULL)
- goto out;
-
- sk->sk_reuse = SK_CAN_REUSE;
- 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;
- int err;
-
- /*
- * Fetch the caller's info block into kernel space
- */
-
- if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
- return -EFAULT;
-
- dev = dev_get_by_name(&init_net, ifr.ifr_name);
- if (dev == NULL)
- return -ENODEV;
-
- sec = (struct sockaddr_ec *)&ifr.ifr_addr;
-
- mutex_lock(&econet_mutex);
-
- err = 0;
- switch (cmd) {
- case SIOCSIFADDR:
- if (!capable(CAP_NET_ADMIN)) {
- err = -EPERM;
- break;
- }
-
- edev = dev->ec_ptr;
- if (edev == NULL) {
- /* Magic up a new one. */
- edev = kzalloc(sizeof(struct ec_device), GFP_KERNEL);
- if (edev == NULL) {
- err = -ENOMEM;
- break;
- }
- 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;
- break;
-
- case SIOCGIFADDR:
- edev = dev->ec_ptr;
- if (edev == NULL) {
- err = -ENODEV;
- break;
- }
- 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)))
- err = -EFAULT;
- break;
-
- default:
- err = -EINVAL;
- break;
- }
-
- mutex_unlock(&econet_mutex);
-
- dev_put(dev);
-
- return err;
-}
-
-/*
- * 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 SIOCGSTAMPNS:
- return sock_get_timestampns(sk, argp);
-
- case SIOCSIFADDR:
- case SIOCGIFADDR:
- return ec_dev_ioctl(sock, cmd, argp);
-
- }
-
- return -ENOIOCTLCMD;
-}
-
-static const struct net_proto_family econet_family_ops = {
- .family = PF_ECONET,
- .create = econet_create,
- .owner = THIS_MODULE,
-};
-
-static const struct proto_ops 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,
-};
-
-#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;
-
- spin_lock(&econet_lock);
- 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)) {
- sock_hold(sk);
- goto found;
- }
- }
- sk = NULL;
-found:
- spin_unlock(&econet_lock);
- 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 = ip_hdr(skb);
- unsigned char stn = ntohl(ip->saddr) & 0xff;
- struct dst_entry *dst = skb_dst(skb);
- struct ec_device *edev = NULL;
- struct sock *sk = NULL;
- struct sk_buff *newskb;
-
- if (dst)
- edev = dst->dev->ec_ptr;
-
- if (!edev)
- goto bad;
-
- sk = ec_listening_socket(ah->port, stn, edev->net);
- if (sk == NULL)
- goto bad; /* Nobody wants it */
-
- newskb = alloc_skb((len - sizeof(struct aunhdr) + 15) & ~15,
- GFP_ATOMIC);
- if (newskb == NULL) {
- pr_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);
- sock_put(sk);
- return;
-
-bad:
- aun_send_response(ip->saddr, ah->handle, 4, 0);
- if (sk)
- sock_put(sk);
-}
-
-/*
- * 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_queue_walk(&aun_queue, skb) {
- eb = (struct ec_cb *)&skb->cb;
- if (eb->seq == seq)
- goto foundit;
- }
- spin_unlock_irqrestore(&aun_queue_lock, flags);
- pr_debug("AUN: unknown sequence %ld\n", seq);
- return;
-
-foundit:
- tx_result(skb->sk, eb->cookie, result);
- skb_unlink(skb, &aun_queue);
- 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;
- size_t len;
-
- while ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) {
- if (err == -EAGAIN) {
- pr_err("AUN: no data available?!\n");
- return;
- }
- pr_debug("AUN: recvfrom() error %d\n", -err);
- }
-
- data = skb_transport_header(skb) + sizeof(struct udphdr);
- ah = (struct aunhdr *)data;
- len = skb->len - sizeof(struct udphdr);
-
- 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;
- default:
- pr_debug("AUN: unknown 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, *n;
- unsigned long flags;
-
- spin_lock_irqsave(&aun_queue_lock, flags);
- skb_queue_walk_safe(&aun_queue, skb, n) {
- 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, &aun_queue);
- kfree_skb(skb);
- }
- }
- 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);
- setup_timer(&ab_cleanup_timer, ab_cleanup, 0);
- ab_cleanup_timer.expires = jiffies + (HZ * 2);
- 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. :-) */
- error = sock_create_kern(PF_INET, SOCK_DGRAM, 0, &udpsock);
- if (error < 0) {
- pr_err("AUN: socket error %d\n", -error);
- return error;
- }
-
- udpsock->sk->sk_reuse = SK_CAN_REUSE;
- 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) {
- pr_err("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 net_device *orig_dev)
-{
- struct ec_framehdr *hdr;
- struct sock *sk = NULL;
- struct ec_device *edev = dev->ec_ptr;
-
- if (!net_eq(dev_net(dev), &init_net))
- goto drop;
-
- if (skb->pkt_type == PACKET_OTHERHOST)
- goto drop;
-
- if (!edev)
- goto drop;
-
- skb = skb_share_check(skb, GFP_ATOMIC);
- if (skb == 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 NET_RX_SUCCESS;
- }
-
- 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;
- sock_put(sk);
- return NET_RX_SUCCESS;
-
-drop:
- if (sk)
- sock_put(sk);
- kfree_skb(skb);
- return NET_RX_DROP;
-}
-
-static struct packet_type econet_packet_type __read_mostly = {
- .type = cpu_to_be16(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 = data;
- struct ec_device *edev;
-
- if (!net_eq(dev_net(dev), &init_net))
- return NOTIFY_DONE;
-
- 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);
-#ifdef CONFIG_ECONET_NATIVE
- dev_remove_pack(&econet_packet_type);
-#endif
- 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
- 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);
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff