2 * X.25 Packet Layer release 002
4 * This is ALPHA test software. This code may break your machine,
5 * randomly fail to work with new releases, misbehave and/or generally
6 * screw up. It might even work.
8 * This code REQUIRES 2.1.15 or higher
11 * This module is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
17 * X.25 001 Jonathan Naylor Started coding.
18 * X.25 002 Jonathan Naylor Centralised disconnect handling.
19 * New timer architecture.
20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
22 * facilities negotiation and increased
23 * the throughput upper limit.
24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
26 * Fixed x25_output() related skb leakage.
27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
31 * x25_proc.c, using seq_file
34 #include <linux/config.h>
35 #include <linux/module.h>
36 #include <linux/errno.h>
37 #include <linux/kernel.h>
38 #include <linux/sched.h>
39 #include <linux/timer.h>
40 #include <linux/string.h>
41 #include <linux/net.h>
42 #include <linux/netdevice.h>
43 #include <linux/if_arp.h>
44 #include <linux/skbuff.h>
47 #include <asm/uaccess.h>
48 #include <linux/fcntl.h>
49 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
50 #include <linux/notifier.h>
51 #include <linux/init.h>
54 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
55 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
56 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
57 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
58 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
61 DEFINE_RWLOCK(x25_list_lock);
63 static struct proto_ops x25_proto_ops;
65 static struct x25_address null_x25_address = {" "};
67 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
68 struct x25_address *calling_addr)
70 int called_len, calling_len;
71 char *called, *calling;
74 called_len = (*p >> 0) & 0x0F;
75 calling_len = (*p >> 4) & 0x0F;
77 called = called_addr->x25_addr;
78 calling = calling_addr->x25_addr;
81 for (i = 0; i < (called_len + calling_len); i++) {
84 *called++ = ((*p >> 0) & 0x0F) + '0';
87 *called++ = ((*p >> 4) & 0x0F) + '0';
91 *calling++ = ((*p >> 0) & 0x0F) + '0';
94 *calling++ = ((*p >> 4) & 0x0F) + '0';
99 *called = *calling = '\0';
101 return 1 + (called_len + calling_len + 1) / 2;
104 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
105 struct x25_address *calling_addr)
107 unsigned int called_len, calling_len;
108 char *called, *calling;
111 called = called_addr->x25_addr;
112 calling = calling_addr->x25_addr;
114 called_len = strlen(called);
115 calling_len = strlen(calling);
117 *p++ = (calling_len << 4) | (called_len << 0);
119 for (i = 0; i < (called_len + calling_len); i++) {
120 if (i < called_len) {
122 *p |= (*called++ - '0') << 0;
126 *p |= (*called++ - '0') << 4;
130 *p |= (*calling++ - '0') << 0;
134 *p |= (*calling++ - '0') << 4;
139 return 1 + (called_len + calling_len + 1) / 2;
143 * Socket removal during an interrupt is now safe.
145 static void x25_remove_socket(struct sock *sk)
147 write_lock_bh(&x25_list_lock);
148 sk_del_node_init(sk);
149 write_unlock_bh(&x25_list_lock);
153 * Kill all bound sockets on a dropped device.
155 static void x25_kill_by_device(struct net_device *dev)
158 struct hlist_node *node;
160 write_lock_bh(&x25_list_lock);
162 sk_for_each(s, node, &x25_list)
163 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
164 x25_disconnect(s, ENETUNREACH, 0, 0);
166 write_unlock_bh(&x25_list_lock);
170 * Handle device status changes.
172 static int x25_device_event(struct notifier_block *this, unsigned long event,
175 struct net_device *dev = ptr;
176 struct x25_neigh *nb;
178 if (dev->type == ARPHRD_X25
179 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
180 || dev->type == ARPHRD_ETHER
185 x25_link_device_up(dev);
187 case NETDEV_GOING_DOWN:
188 nb = x25_get_neigh(dev);
190 x25_terminate_link(nb);
195 x25_kill_by_device(dev);
196 x25_route_device_down(dev);
197 x25_link_device_down(dev);
206 * Add a socket to the bound sockets list.
208 static void x25_insert_socket(struct sock *sk)
210 write_lock_bh(&x25_list_lock);
211 sk_add_node(sk, &x25_list);
212 write_unlock_bh(&x25_list_lock);
216 * Find a socket that wants to accept the Call Request we just
217 * received. Check the full list for an address/cud match.
218 * If no cuds match return the next_best thing, an address match.
219 * Note: if a listening socket has cud set it must only get calls
222 static struct sock *x25_find_listener(struct x25_address *addr, struct x25_calluserdata *calluserdata)
225 struct sock *next_best;
226 struct hlist_node *node;
228 read_lock_bh(&x25_list_lock);
231 sk_for_each(s, node, &x25_list)
232 if ((!strcmp(addr->x25_addr,
233 x25_sk(s)->source_addr.x25_addr) ||
234 !strcmp(addr->x25_addr,
235 null_x25_address.x25_addr)) &&
236 s->sk_state == TCP_LISTEN) {
239 * Found a listening socket, now check the incoming
240 * call user data vs this sockets call user data
242 if (x25_check_calluserdata(&x25_sk(s)->calluserdata, calluserdata)) {
246 if (x25_sk(s)->calluserdata.cudlength == 0) {
257 read_unlock_bh(&x25_list_lock);
262 * Find a connected X.25 socket given my LCI and neighbour.
264 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
267 struct hlist_node *node;
269 sk_for_each(s, node, &x25_list)
270 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
279 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
283 read_lock_bh(&x25_list_lock);
284 s = __x25_find_socket(lci, nb);
285 read_unlock_bh(&x25_list_lock);
290 * Find a unique LCI for a given device.
292 static unsigned int x25_new_lci(struct x25_neigh *nb)
294 unsigned int lci = 1;
297 read_lock_bh(&x25_list_lock);
299 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
307 read_unlock_bh(&x25_list_lock);
314 void x25_destroy_socket(struct sock *);
317 * handler for deferred kills.
319 static void x25_destroy_timer(unsigned long data)
321 x25_destroy_socket((struct sock *)data);
325 * This is called from user mode and the timers. Thus it protects itself
326 * against interrupt users but doesn't worry about being called during
327 * work. Once it is removed from the queue no interrupt or bottom half
328 * will touch it and we are (fairly 8-) ) safe.
329 * Not static as it's used by the timer
331 void x25_destroy_socket(struct sock *sk)
337 x25_stop_heartbeat(sk);
340 x25_remove_socket(sk);
341 x25_clear_queues(sk); /* Flush the queues */
343 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
344 if (skb->sk != sk) { /* A pending connection */
346 * Queue the unaccepted socket for death
348 sock_set_flag(skb->sk, SOCK_DEAD);
349 x25_start_heartbeat(skb->sk);
350 x25_sk(skb->sk)->state = X25_STATE_0;
356 if (atomic_read(&sk->sk_wmem_alloc) ||
357 atomic_read(&sk->sk_rmem_alloc)) {
358 /* Defer: outstanding buffers */
359 sk->sk_timer.expires = jiffies + 10 * HZ;
360 sk->sk_timer.function = x25_destroy_timer;
361 sk->sk_timer.data = (unsigned long)sk;
362 add_timer(&sk->sk_timer);
364 /* drop last reference so sock_put will free */
373 * Handling for system calls applied via the various interfaces to a
374 * X.25 socket object.
377 static int x25_setsockopt(struct socket *sock, int level, int optname,
378 char __user *optval, int optlen)
381 struct sock *sk = sock->sk;
382 int rc = -ENOPROTOOPT;
384 if (level != SOL_X25 || optname != X25_QBITINCL)
388 if (optlen < sizeof(int))
392 if (get_user(opt, (int __user *)optval))
395 x25_sk(sk)->qbitincl = !!opt;
401 static int x25_getsockopt(struct socket *sock, int level, int optname,
402 char __user *optval, int __user *optlen)
404 struct sock *sk = sock->sk;
405 int val, len, rc = -ENOPROTOOPT;
407 if (level != SOL_X25 || optname != X25_QBITINCL)
411 if (get_user(len, optlen))
414 len = min_t(unsigned int, len, sizeof(int));
421 if (put_user(len, optlen))
424 val = x25_sk(sk)->qbitincl;
425 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
430 static int x25_listen(struct socket *sock, int backlog)
432 struct sock *sk = sock->sk;
433 int rc = -EOPNOTSUPP;
435 if (sk->sk_state != TCP_LISTEN) {
436 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
437 sk->sk_max_ack_backlog = backlog;
438 sk->sk_state = TCP_LISTEN;
445 static struct proto x25_proto = {
447 .owner = THIS_MODULE,
448 .obj_size = sizeof(struct x25_sock),
451 static struct sock *x25_alloc_socket(void)
453 struct x25_sock *x25;
454 struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
459 sock_init_data(NULL, sk);
462 skb_queue_head_init(&x25->ack_queue);
463 skb_queue_head_init(&x25->fragment_queue);
464 skb_queue_head_init(&x25->interrupt_in_queue);
465 skb_queue_head_init(&x25->interrupt_out_queue);
470 void x25_init_timers(struct sock *sk);
472 static int x25_create(struct socket *sock, int protocol)
475 struct x25_sock *x25;
476 int rc = -ESOCKTNOSUPPORT;
478 if (sock->type != SOCK_SEQPACKET || protocol)
482 if ((sk = x25_alloc_socket()) == NULL)
487 sock_init_data(sock, sk);
491 sock->ops = &x25_proto_ops;
492 sk->sk_protocol = protocol;
493 sk->sk_backlog_rcv = x25_backlog_rcv;
495 x25->t21 = sysctl_x25_call_request_timeout;
496 x25->t22 = sysctl_x25_reset_request_timeout;
497 x25->t23 = sysctl_x25_clear_request_timeout;
498 x25->t2 = sysctl_x25_ack_holdback_timeout;
499 x25->state = X25_STATE_0;
501 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
502 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
503 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
504 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
505 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
506 x25->facilities.reverse = X25_DEFAULT_REVERSE;
512 static struct sock *x25_make_new(struct sock *osk)
514 struct sock *sk = NULL;
515 struct x25_sock *x25, *ox25;
517 if (osk->sk_type != SOCK_SEQPACKET)
520 if ((sk = x25_alloc_socket()) == NULL)
525 sk->sk_type = osk->sk_type;
526 sk->sk_socket = osk->sk_socket;
527 sk->sk_priority = osk->sk_priority;
528 sk->sk_protocol = osk->sk_protocol;
529 sk->sk_rcvbuf = osk->sk_rcvbuf;
530 sk->sk_sndbuf = osk->sk_sndbuf;
531 sk->sk_state = TCP_ESTABLISHED;
532 sk->sk_sleep = osk->sk_sleep;
533 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
535 if (sock_flag(osk, SOCK_ZAPPED))
536 sock_set_flag(sk, SOCK_ZAPPED);
538 if (sock_flag(osk, SOCK_DBG))
539 sock_set_flag(sk, SOCK_DBG);
542 x25->t21 = ox25->t21;
543 x25->t22 = ox25->t22;
544 x25->t23 = ox25->t23;
546 x25->facilities = ox25->facilities;
547 x25->qbitincl = ox25->qbitincl;
554 static int x25_release(struct socket *sock)
556 struct sock *sk = sock->sk;
557 struct x25_sock *x25;
564 switch (x25->state) {
568 x25_disconnect(sk, 0, 0, 0);
569 x25_destroy_socket(sk);
575 x25_clear_queues(sk);
576 x25_write_internal(sk, X25_CLEAR_REQUEST);
577 x25_start_t23timer(sk);
578 x25->state = X25_STATE_2;
579 sk->sk_state = TCP_CLOSE;
580 sk->sk_shutdown |= SEND_SHUTDOWN;
581 sk->sk_state_change(sk);
582 sock_set_flag(sk, SOCK_DEAD);
583 sock_set_flag(sk, SOCK_DESTROY);
588 sk->sk_socket = NULL; /* Not used, but we should do this */
593 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
595 struct sock *sk = sock->sk;
596 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
598 if (!sock_flag(sk, SOCK_ZAPPED) ||
599 addr_len != sizeof(struct sockaddr_x25) ||
600 addr->sx25_family != AF_X25)
603 x25_sk(sk)->source_addr = addr->sx25_addr;
604 x25_insert_socket(sk);
605 sock_reset_flag(sk, SOCK_ZAPPED);
606 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
611 static int x25_wait_for_connection_establishment(struct sock *sk)
613 DECLARE_WAITQUEUE(wait, current);
616 add_wait_queue_exclusive(sk->sk_sleep, &wait);
618 __set_current_state(TASK_INTERRUPTIBLE);
620 if (signal_pending(current))
624 sk->sk_socket->state = SS_UNCONNECTED;
628 if (sk->sk_state != TCP_ESTABLISHED) {
635 __set_current_state(TASK_RUNNING);
636 remove_wait_queue(sk->sk_sleep, &wait);
640 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
641 int addr_len, int flags)
643 struct sock *sk = sock->sk;
644 struct x25_sock *x25 = x25_sk(sk);
645 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
646 struct x25_route *rt;
650 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
651 sock->state = SS_CONNECTED;
652 goto out; /* Connect completed during a ERESTARTSYS event */
656 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
657 sock->state = SS_UNCONNECTED;
661 rc = -EISCONN; /* No reconnect on a seqpacket socket */
662 if (sk->sk_state == TCP_ESTABLISHED)
665 sk->sk_state = TCP_CLOSE;
666 sock->state = SS_UNCONNECTED;
669 if (addr_len != sizeof(struct sockaddr_x25) ||
670 addr->sx25_family != AF_X25)
674 rt = x25_get_route(&addr->sx25_addr);
678 x25->neighbour = x25_get_neigh(rt->dev);
682 x25_limit_facilities(&x25->facilities, x25->neighbour);
684 x25->lci = x25_new_lci(x25->neighbour);
689 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
692 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
693 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
695 x25->dest_addr = addr->sx25_addr;
697 /* Move to connecting socket, start sending Connect Requests */
698 sock->state = SS_CONNECTING;
699 sk->sk_state = TCP_SYN_SENT;
701 x25->state = X25_STATE_1;
703 x25_write_internal(sk, X25_CALL_REQUEST);
705 x25_start_heartbeat(sk);
706 x25_start_t21timer(sk);
710 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
713 rc = x25_wait_for_connection_establishment(sk);
717 sock->state = SS_CONNECTED;
721 x25_neigh_put(x25->neighbour);
729 static int x25_wait_for_data(struct sock *sk, int timeout)
731 DECLARE_WAITQUEUE(wait, current);
734 add_wait_queue_exclusive(sk->sk_sleep, &wait);
736 __set_current_state(TASK_INTERRUPTIBLE);
737 if (sk->sk_shutdown & RCV_SHUTDOWN)
740 if (signal_pending(current))
746 if (skb_queue_empty(&sk->sk_receive_queue)) {
748 timeout = schedule_timeout(timeout);
753 __set_current_state(TASK_RUNNING);
754 remove_wait_queue(sk->sk_sleep, &wait);
758 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
760 struct sock *sk = sock->sk;
765 if (!sk || sk->sk_state != TCP_LISTEN)
769 if (sk->sk_type != SOCK_SEQPACKET)
773 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
776 skb = skb_dequeue(&sk->sk_receive_queue);
781 newsk->sk_socket = newsock;
782 newsk->sk_sleep = &newsock->wait;
784 /* Now attach up the new socket */
787 sk->sk_ack_backlog--;
789 newsock->state = SS_CONNECTED;
797 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
798 int *uaddr_len, int peer)
800 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
801 struct sock *sk = sock->sk;
802 struct x25_sock *x25 = x25_sk(sk);
805 if (sk->sk_state != TCP_ESTABLISHED)
807 sx25->sx25_addr = x25->dest_addr;
809 sx25->sx25_addr = x25->source_addr;
811 sx25->sx25_family = AF_X25;
812 *uaddr_len = sizeof(*sx25);
817 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
822 struct x25_sock *makex25;
823 struct x25_address source_addr, dest_addr;
824 struct x25_facilities facilities;
825 struct x25_calluserdata calluserdata;
829 * Remove the LCI and frame type.
831 skb_pull(skb, X25_STD_MIN_LEN);
834 * Extract the X.25 addresses and convert them to ASCII strings,
837 skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
840 * Get the length of the facilities, skip past them for the moment
841 * get the call user data because this is needed to determine
842 * the correct listener
844 len = skb->data[0] + 1;
848 * Incoming Call User Data.
851 memcpy(calluserdata.cuddata, skb->data, skb->len);
852 calluserdata.cudlength = skb->len;
858 * Find a listener for the particular address/cud pair.
860 sk = x25_find_listener(&source_addr,&calluserdata);
863 * We can't accept the Call Request.
865 if (sk == NULL || sk_acceptq_is_full(sk))
866 goto out_clear_request;
869 * Try to reach a compromise on the requested facilities.
871 if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
875 * current neighbour/link might impose additional limits
876 * on certain facilties
879 x25_limit_facilities(&facilities, nb);
882 * Try to create a new socket.
884 make = x25_make_new(sk);
889 * Remove the facilities
894 make->sk_state = TCP_ESTABLISHED;
896 makex25 = x25_sk(make);
898 makex25->dest_addr = dest_addr;
899 makex25->source_addr = source_addr;
900 makex25->neighbour = nb;
901 makex25->facilities = facilities;
902 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
903 makex25->calluserdata = calluserdata;
905 x25_write_internal(make, X25_CALL_ACCEPTED);
907 makex25->state = X25_STATE_3;
909 sk->sk_ack_backlog++;
911 x25_insert_socket(make);
913 skb_queue_head(&sk->sk_receive_queue, skb);
915 x25_start_heartbeat(make);
917 if (!sock_flag(sk, SOCK_DEAD))
918 sk->sk_data_ready(sk, skb->len);
927 x25_transmit_clear_request(nb, lci, 0x01);
931 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
932 struct msghdr *msg, size_t len)
934 struct sock *sk = sock->sk;
935 struct x25_sock *x25 = x25_sk(sk);
936 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
937 struct sockaddr_x25 sx25;
939 unsigned char *asmptr;
940 int noblock = msg->msg_flags & MSG_DONTWAIT;
942 int qbit = 0, rc = -EINVAL;
944 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
947 /* we currently don't support segmented records at the user interface */
948 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
952 if (sock_flag(sk, SOCK_ZAPPED))
956 if (sk->sk_shutdown & SEND_SHUTDOWN) {
957 send_sig(SIGPIPE, current, 0);
967 if (msg->msg_namelen < sizeof(sx25))
969 memcpy(&sx25, usx25, sizeof(sx25));
971 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
974 if (sx25.sx25_family != AF_X25)
978 * FIXME 1003.1g - if the socket is like this because
979 * it has become closed (not started closed) we ought
983 if (sk->sk_state != TCP_ESTABLISHED)
986 sx25.sx25_family = AF_X25;
987 sx25.sx25_addr = x25->dest_addr;
990 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
993 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
995 if ((msg->msg_flags & MSG_OOB) && len > 32)
998 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1000 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1003 X25_SKB_CB(skb)->flags = msg->msg_flags;
1005 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1008 * Put the data on the end
1010 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1012 asmptr = skb->h.raw = skb_put(skb, len);
1014 rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1019 * If the Q BIT Include socket option is in force, the first
1020 * byte of the user data is the logical value of the Q Bit.
1022 if (x25->qbitincl) {
1023 qbit = skb->data[0];
1028 * Push down the X.25 header
1030 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1032 if (msg->msg_flags & MSG_OOB) {
1033 if (x25->neighbour->extended) {
1034 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1035 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1036 *asmptr++ = (x25->lci >> 0) & 0xFF;
1037 *asmptr++ = X25_INTERRUPT;
1039 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1040 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1041 *asmptr++ = (x25->lci >> 0) & 0xFF;
1042 *asmptr++ = X25_INTERRUPT;
1045 if (x25->neighbour->extended) {
1046 /* Build an Extended X.25 header */
1047 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1048 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1049 *asmptr++ = (x25->lci >> 0) & 0xFF;
1050 *asmptr++ = X25_DATA;
1051 *asmptr++ = X25_DATA;
1053 /* Build an Standard X.25 header */
1054 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1055 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1056 *asmptr++ = (x25->lci >> 0) & 0xFF;
1057 *asmptr++ = X25_DATA;
1061 skb->data[0] |= X25_Q_BIT;
1064 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1065 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1068 if (sk->sk_state != TCP_ESTABLISHED)
1071 if (msg->msg_flags & MSG_OOB)
1072 skb_queue_tail(&x25->interrupt_out_queue, skb);
1074 len = x25_output(sk, skb);
1077 else if (x25->qbitincl)
1082 * lock_sock() is currently only used to serialize this x25_kick()
1083 * against input-driven x25_kick() calls. It currently only blocks
1084 * incoming packets for this socket and does not protect against
1085 * any other socket state changes and is not called from anywhere
1086 * else. As x25_kick() cannot block and as long as all socket
1087 * operations are BKL-wrapped, we don't need take to care about
1088 * purging the backlog queue in x25_release().
1090 * Using lock_sock() to protect all socket operations entirely
1091 * (and making the whole x25 stack SMP aware) unfortunately would
1092 * require major changes to {send,recv}msg and skb allocation methods.
1107 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1108 struct msghdr *msg, size_t size,
1111 struct sock *sk = sock->sk;
1112 struct x25_sock *x25 = x25_sk(sk);
1113 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1116 struct sk_buff *skb;
1117 unsigned char *asmptr;
1121 * This works for seqpacket too. The receiver has ordered the queue for
1122 * us! We do one quick check first though
1124 if (sk->sk_state != TCP_ESTABLISHED)
1127 if (flags & MSG_OOB) {
1129 if (sock_flag(sk, SOCK_URGINLINE) ||
1130 !skb_peek(&x25->interrupt_in_queue))
1133 skb = skb_dequeue(&x25->interrupt_in_queue);
1135 skb_pull(skb, X25_STD_MIN_LEN);
1138 * No Q bit information on Interrupt data.
1140 if (x25->qbitincl) {
1141 asmptr = skb_push(skb, 1);
1145 msg->msg_flags |= MSG_OOB;
1147 /* Now we can treat all alike */
1148 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1149 flags & MSG_DONTWAIT, &rc);
1153 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1155 skb_pull(skb, x25->neighbour->extended ?
1156 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1158 if (x25->qbitincl) {
1159 asmptr = skb_push(skb, 1);
1164 skb->h.raw = skb->data;
1168 if (copied > size) {
1170 msg->msg_flags |= MSG_TRUNC;
1173 /* Currently, each datagram always contains a complete record */
1174 msg->msg_flags |= MSG_EOR;
1176 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1178 goto out_free_dgram;
1181 sx25->sx25_family = AF_X25;
1182 sx25->sx25_addr = x25->dest_addr;
1185 msg->msg_namelen = sizeof(struct sockaddr_x25);
1192 skb_free_datagram(sk, skb);
1198 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1200 struct sock *sk = sock->sk;
1201 struct x25_sock *x25 = x25_sk(sk);
1202 void __user *argp = (void __user *)arg;
1207 int amount = sk->sk_sndbuf -
1208 atomic_read(&sk->sk_wmem_alloc);
1211 rc = put_user(amount, (unsigned int __user *)argp);
1216 struct sk_buff *skb;
1219 * These two are safe on a single CPU system as
1220 * only user tasks fiddle here
1222 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1224 rc = put_user(amount, (unsigned int __user *)argp);
1231 rc = sock_get_timestamp(sk,
1232 (struct timeval __user *)argp);
1236 case SIOCGIFDSTADDR:
1237 case SIOCSIFDSTADDR:
1238 case SIOCGIFBRDADDR:
1239 case SIOCSIFBRDADDR:
1240 case SIOCGIFNETMASK:
1241 case SIOCSIFNETMASK:
1249 if (!capable(CAP_NET_ADMIN))
1251 rc = x25_route_ioctl(cmd, argp);
1253 case SIOCX25GSUBSCRIP:
1254 rc = x25_subscr_ioctl(cmd, argp);
1256 case SIOCX25SSUBSCRIP:
1258 if (!capable(CAP_NET_ADMIN))
1260 rc = x25_subscr_ioctl(cmd, argp);
1262 case SIOCX25GFACILITIES: {
1263 struct x25_facilities fac = x25->facilities;
1264 rc = copy_to_user(argp, &fac,
1265 sizeof(fac)) ? -EFAULT : 0;
1269 case SIOCX25SFACILITIES: {
1270 struct x25_facilities facilities;
1272 if (copy_from_user(&facilities, argp,
1273 sizeof(facilities)))
1276 if (sk->sk_state != TCP_LISTEN &&
1277 sk->sk_state != TCP_CLOSE)
1279 if (facilities.pacsize_in < X25_PS16 ||
1280 facilities.pacsize_in > X25_PS4096)
1282 if (facilities.pacsize_out < X25_PS16 ||
1283 facilities.pacsize_out > X25_PS4096)
1285 if (facilities.winsize_in < 1 ||
1286 facilities.winsize_in > 127)
1288 if (facilities.throughput < 0x03 ||
1289 facilities.throughput > 0xDD)
1291 if (facilities.reverse && facilities.reverse != 1)
1293 x25->facilities = facilities;
1298 case SIOCX25GCALLUSERDATA: {
1299 struct x25_calluserdata cud = x25->calluserdata;
1300 rc = copy_to_user(argp, &cud,
1301 sizeof(cud)) ? -EFAULT : 0;
1305 case SIOCX25SCALLUSERDATA: {
1306 struct x25_calluserdata calluserdata;
1309 if (copy_from_user(&calluserdata, argp,
1310 sizeof(calluserdata)))
1313 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1315 x25->calluserdata = calluserdata;
1320 case SIOCX25GCAUSEDIAG: {
1321 struct x25_causediag causediag;
1322 causediag = x25->causediag;
1323 rc = copy_to_user(argp, &causediag,
1324 sizeof(causediag)) ? -EFAULT : 0;
1329 rc = dev_ioctl(cmd, argp);
1336 static struct net_proto_family x25_family_ops = {
1338 .create = x25_create,
1339 .owner = THIS_MODULE,
1342 static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1344 .owner = THIS_MODULE,
1345 .release = x25_release,
1347 .connect = x25_connect,
1348 .socketpair = sock_no_socketpair,
1349 .accept = x25_accept,
1350 .getname = x25_getname,
1351 .poll = datagram_poll,
1353 .listen = x25_listen,
1354 .shutdown = sock_no_shutdown,
1355 .setsockopt = x25_setsockopt,
1356 .getsockopt = x25_getsockopt,
1357 .sendmsg = x25_sendmsg,
1358 .recvmsg = x25_recvmsg,
1359 .mmap = sock_no_mmap,
1360 .sendpage = sock_no_sendpage,
1363 #include <linux/smp_lock.h>
1364 SOCKOPS_WRAP(x25_proto, AF_X25);
1366 static struct packet_type x25_packet_type = {
1367 .type = __constant_htons(ETH_P_X25),
1368 .func = x25_lapb_receive_frame,
1371 static struct notifier_block x25_dev_notifier = {
1372 .notifier_call = x25_device_event,
1375 void x25_kill_by_neigh(struct x25_neigh *nb)
1378 struct hlist_node *node;
1380 write_lock_bh(&x25_list_lock);
1382 sk_for_each(s, node, &x25_list)
1383 if (x25_sk(s)->neighbour == nb)
1384 x25_disconnect(s, ENETUNREACH, 0, 0);
1386 write_unlock_bh(&x25_list_lock);
1389 static int __init x25_init(void)
1391 int rc = proto_register(&x25_proto, 0);
1396 sock_register(&x25_family_ops);
1398 dev_add_pack(&x25_packet_type);
1400 register_netdevice_notifier(&x25_dev_notifier);
1402 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1404 #ifdef CONFIG_SYSCTL
1405 x25_register_sysctl();
1411 module_init(x25_init);
1413 static void __exit x25_exit(void)
1419 #ifdef CONFIG_SYSCTL
1420 x25_unregister_sysctl();
1423 unregister_netdevice_notifier(&x25_dev_notifier);
1425 dev_remove_pack(&x25_packet_type);
1427 sock_unregister(AF_X25);
1428 proto_unregister(&x25_proto);
1430 module_exit(x25_exit);
1432 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1433 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1434 MODULE_LICENSE("GPL");
1435 MODULE_ALIAS_NETPROTO(PF_X25);