| /* |
| * 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/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 <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 <asm/uaccess.h> |
| #include <asm/system.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) |
| { |
| 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. |
| */ |
| |
| 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 (len + 15 > dev->mtu) { |
| mutex_unlock(&econet_mutex); |
| return -EMSGSIZE; |
| } |
| |
| if (dev->type == ARPHRD_ECONET) { |
| /* Real hardware Econet. We're not worthy etc. */ |
| #ifdef CONFIG_ECONET_NATIVE |
| unsigned short proto = 0; |
| int res; |
| |
| dev_hold(dev); |
| |
| skb = sock_alloc_send_skb(sk, len+LL_ALLOCATED_SPACE(dev), |
| msg->msg_flags & MSG_DONTWAIT, &err); |
| if (skb==NULL) |
| goto out_unlock; |
| |
| skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 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 */ |
| } |
| |
| /* 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); |
| } |
| |
| 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 iov_len = msg->msg_iov[i].iov_len; |
| /* Check it now since we switch to KERNEL_DS later. */ |
| if (!access_ok(VERIFY_READ, base, iov_len)) { |
| mutex_unlock(&econet_mutex); |
| return -EFAULT; |
| } |
| iov[i+1].iov_base = base; |
| iov[i+1].iov_len = iov_len; |
| size += iov_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) { |
| mutex_unlock(&econet_mutex); |
| 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 |
| 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); |
| printk(KERN_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 = 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; |
| int err; |
| |
| /* |
| * 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(&init_net, ifr.ifr_name)) == NULL) |
| return -ENODEV; |
| |
| sec = (struct sockaddr_ec *)&ifr.ifr_addr; |
| |
| mutex_lock(&econet_mutex); |
| |
| err = 0; |
| switch (cmd) { |
| case SIOCSIFADDR: |
| 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); |
| break; |
| |
| default: |
| return -ENOIOCTLCMD; |
| } |
| /*NOTREACHED*/ |
| return 0; |
| } |
| |
| 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 sock *sk = NULL; |
| 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); |
| 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); |
| printk(KERN_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; |
| 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_transport_header(skb) + sizeof(struct udphdr); |
| ah = (struct aunhdr *)data; |
| len = skb->len - sizeof(struct udphdr); |
| ip = ip_hdr(skb); |
| |
| 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, *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. :-) */ |
| 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 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; |
| |
| 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 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 = (struct net_device *)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); |