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/types.h>
38 #include <linux/socket.h>
40 #include <linux/kernel.h>
41 #include <linux/sched.h>
42 #include <linux/timer.h>
43 #include <linux/string.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/stat.h>
47 #include <linux/inet.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_arp.h>
50 #include <linux/skbuff.h>
53 #include <asm/system.h>
54 #include <asm/uaccess.h>
55 #include <linux/fcntl.h>
56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
58 #include <linux/interrupt.h>
59 #include <linux/notifier.h>
60 #include <linux/init.h>
63 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
64 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
65 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
66 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
67 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
70 rwlock_t x25_list_lock = RW_LOCK_UNLOCKED;
72 static struct proto_ops x25_proto_ops;
74 static struct x25_address null_x25_address = {" "};
76 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
77 struct x25_address *calling_addr)
79 int called_len, calling_len;
80 char *called, *calling;
83 called_len = (*p >> 0) & 0x0F;
84 calling_len = (*p >> 4) & 0x0F;
86 called = called_addr->x25_addr;
87 calling = calling_addr->x25_addr;
90 for (i = 0; i < (called_len + calling_len); i++) {
93 *called++ = ((*p >> 0) & 0x0F) + '0';
96 *called++ = ((*p >> 4) & 0x0F) + '0';
100 *calling++ = ((*p >> 0) & 0x0F) + '0';
103 *calling++ = ((*p >> 4) & 0x0F) + '0';
108 *called = *calling = '\0';
110 return 1 + (called_len + calling_len + 1) / 2;
113 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
114 struct x25_address *calling_addr)
116 unsigned int called_len, calling_len;
117 char *called, *calling;
120 called = called_addr->x25_addr;
121 calling = calling_addr->x25_addr;
123 called_len = strlen(called);
124 calling_len = strlen(calling);
126 *p++ = (calling_len << 4) | (called_len << 0);
128 for (i = 0; i < (called_len + calling_len); i++) {
129 if (i < called_len) {
131 *p |= (*called++ - '0') << 0;
135 *p |= (*called++ - '0') << 4;
139 *p |= (*calling++ - '0') << 0;
143 *p |= (*calling++ - '0') << 4;
148 return 1 + (called_len + calling_len + 1) / 2;
152 * Socket removal during an interrupt is now safe.
154 static void x25_remove_socket(struct sock *sk)
156 write_lock_bh(&x25_list_lock);
157 sk_del_node_init(sk);
158 write_unlock_bh(&x25_list_lock);
162 * Kill all bound sockets on a dropped device.
164 static void x25_kill_by_device(struct net_device *dev)
167 struct hlist_node *node;
169 write_lock_bh(&x25_list_lock);
171 sk_for_each(s, node, &x25_list)
172 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
173 x25_disconnect(s, ENETUNREACH, 0, 0);
175 write_unlock_bh(&x25_list_lock);
179 * Handle device status changes.
181 static int x25_device_event(struct notifier_block *this, unsigned long event,
184 struct net_device *dev = ptr;
185 struct x25_neigh *nb;
187 if (dev->type == ARPHRD_X25
188 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
189 || dev->type == ARPHRD_ETHER
194 x25_link_device_up(dev);
196 case NETDEV_GOING_DOWN:
197 nb = x25_get_neigh(dev);
199 x25_terminate_link(nb);
204 x25_kill_by_device(dev);
205 x25_route_device_down(dev);
206 x25_link_device_down(dev);
215 * Add a socket to the bound sockets list.
217 static void x25_insert_socket(struct sock *sk)
219 write_lock_bh(&x25_list_lock);
220 sk_add_node(sk, &x25_list);
221 write_unlock_bh(&x25_list_lock);
225 * Find a socket that wants to accept the Call Request we just
228 static struct sock *x25_find_listener(struct x25_address *addr)
231 struct hlist_node *node;
233 read_lock_bh(&x25_list_lock);
235 sk_for_each(s, node, &x25_list)
236 if ((!strcmp(addr->x25_addr,
237 x25_sk(s)->source_addr.x25_addr) ||
238 !strcmp(addr->x25_addr,
239 null_x25_address.x25_addr)) &&
240 s->sk_state == TCP_LISTEN) {
246 read_unlock_bh(&x25_list_lock);
251 * Find a connected X.25 socket given my LCI and neighbour.
253 struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
256 struct hlist_node *node;
258 sk_for_each(s, node, &x25_list)
259 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
268 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
272 read_lock_bh(&x25_list_lock);
273 s = __x25_find_socket(lci, nb);
274 read_unlock_bh(&x25_list_lock);
279 * Find a unique LCI for a given device.
281 unsigned int x25_new_lci(struct x25_neigh *nb)
283 unsigned int lci = 1;
286 read_lock_bh(&x25_list_lock);
288 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
296 read_unlock_bh(&x25_list_lock);
303 void x25_destroy_socket(struct sock *);
306 * handler for deferred kills.
308 static void x25_destroy_timer(unsigned long data)
310 x25_destroy_socket((struct sock *)data);
314 * This is called from user mode and the timers. Thus it protects itself
315 * against interrupt users but doesn't worry about being called during
316 * work. Once it is removed from the queue no interrupt or bottom half
317 * will touch it and we are (fairly 8-) ) safe.
318 * Not static as it's used by the timer
320 void x25_destroy_socket(struct sock *sk)
326 x25_stop_heartbeat(sk);
329 x25_remove_socket(sk);
330 x25_clear_queues(sk); /* Flush the queues */
332 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
333 if (skb->sk != sk) { /* A pending connection */
335 * Queue the unaccepted socket for death
337 sock_set_flag(skb->sk, SOCK_DEAD);
338 x25_start_heartbeat(skb->sk);
339 x25_sk(skb->sk)->state = X25_STATE_0;
345 if (atomic_read(&sk->sk_wmem_alloc) ||
346 atomic_read(&sk->sk_rmem_alloc)) {
347 /* Defer: outstanding buffers */
348 sk->sk_timer.expires = jiffies + 10 * HZ;
349 sk->sk_timer.function = x25_destroy_timer;
350 add_timer(&sk->sk_timer);
352 /* drop last reference so sock_put will free */
361 * Handling for system calls applied via the various interfaces to a
362 * X.25 socket object.
365 static int x25_setsockopt(struct socket *sock, int level, int optname,
366 char __user *optval, int optlen)
369 struct sock *sk = sock->sk;
370 int rc = -ENOPROTOOPT;
372 if (level != SOL_X25 || optname != X25_QBITINCL)
376 if (optlen < sizeof(int))
380 if (get_user(opt, (int __user *)optval))
383 x25_sk(sk)->qbitincl = !!opt;
389 static int x25_getsockopt(struct socket *sock, int level, int optname,
390 char __user *optval, int __user *optlen)
392 struct sock *sk = sock->sk;
393 int val, len, rc = -ENOPROTOOPT;
395 if (level != SOL_X25 || optname != X25_QBITINCL)
399 if (get_user(len, optlen))
402 len = min_t(unsigned int, len, sizeof(int));
409 if (put_user(len, optlen))
412 val = x25_sk(sk)->qbitincl;
413 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
418 static int x25_listen(struct socket *sock, int backlog)
420 struct sock *sk = sock->sk;
421 int rc = -EOPNOTSUPP;
423 if (sk->sk_state != TCP_LISTEN) {
424 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
425 sk->sk_max_ack_backlog = backlog;
426 sk->sk_state = TCP_LISTEN;
433 static struct sock *x25_alloc_socket(void)
436 struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, 1, NULL);
441 x25 = sk->sk_protinfo = kmalloc(sizeof(*x25), GFP_ATOMIC);
445 memset(x25, 0, sizeof(*x25));
449 sock_init_data(NULL, sk);
450 sk_set_owner(sk, THIS_MODULE);
452 skb_queue_head_init(&x25->ack_queue);
453 skb_queue_head_init(&x25->fragment_queue);
454 skb_queue_head_init(&x25->interrupt_in_queue);
455 skb_queue_head_init(&x25->interrupt_out_queue);
464 void x25_init_timers(struct sock *sk);
466 static int x25_create(struct socket *sock, int protocol)
470 int rc = -ESOCKTNOSUPPORT;
472 if (sock->type != SOCK_SEQPACKET || protocol)
476 if ((sk = x25_alloc_socket()) == NULL)
481 sock_init_data(sock, sk);
482 sk_set_owner(sk, THIS_MODULE);
486 sock->ops = &x25_proto_ops;
487 sk->sk_protocol = protocol;
488 sk->sk_backlog_rcv = x25_backlog_rcv;
490 x25->t21 = sysctl_x25_call_request_timeout;
491 x25->t22 = sysctl_x25_reset_request_timeout;
492 x25->t23 = sysctl_x25_clear_request_timeout;
493 x25->t2 = sysctl_x25_ack_holdback_timeout;
494 x25->state = X25_STATE_0;
496 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
497 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
498 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
499 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
500 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
501 x25->facilities.reverse = X25_DEFAULT_REVERSE;
507 static struct sock *x25_make_new(struct sock *osk)
509 struct sock *sk = NULL;
510 struct x25_opt *x25, *ox25;
512 if (osk->sk_type != SOCK_SEQPACKET)
515 if ((sk = x25_alloc_socket()) == NULL)
520 sk->sk_type = osk->sk_type;
521 sk->sk_socket = osk->sk_socket;
522 sk->sk_priority = osk->sk_priority;
523 sk->sk_protocol = osk->sk_protocol;
524 sk->sk_rcvbuf = osk->sk_rcvbuf;
525 sk->sk_sndbuf = osk->sk_sndbuf;
526 sk->sk_debug = osk->sk_debug;
527 sk->sk_state = TCP_ESTABLISHED;
528 sk->sk_sleep = osk->sk_sleep;
529 sk->sk_zapped = osk->sk_zapped;
530 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
533 x25->t21 = ox25->t21;
534 x25->t22 = ox25->t22;
535 x25->t23 = ox25->t23;
537 x25->facilities = ox25->facilities;
538 x25->qbitincl = ox25->qbitincl;
545 static int x25_release(struct socket *sock)
547 struct sock *sk = sock->sk;
555 switch (x25->state) {
559 x25_disconnect(sk, 0, 0, 0);
560 x25_destroy_socket(sk);
566 x25_clear_queues(sk);
567 x25_write_internal(sk, X25_CLEAR_REQUEST);
568 x25_start_t23timer(sk);
569 x25->state = X25_STATE_2;
570 sk->sk_state = TCP_CLOSE;
571 sk->sk_shutdown |= SEND_SHUTDOWN;
572 sk->sk_state_change(sk);
573 sock_set_flag(sk, SOCK_DEAD);
574 sock_set_flag(sk, SOCK_DESTROY);
579 sk->sk_socket = NULL; /* Not used, but we should do this */
584 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
586 struct sock *sk = sock->sk;
587 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
589 if (!sk->sk_zapped ||
590 addr_len != sizeof(struct sockaddr_x25) ||
591 addr->sx25_family != AF_X25)
594 x25_sk(sk)->source_addr = addr->sx25_addr;
595 x25_insert_socket(sk);
597 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
602 static int x25_wait_for_connection_establishment(struct sock *sk)
604 DECLARE_WAITQUEUE(wait, current);
607 add_wait_queue_exclusive(sk->sk_sleep, &wait);
609 __set_current_state(TASK_INTERRUPTIBLE);
611 if (signal_pending(current))
615 sk->sk_socket->state = SS_UNCONNECTED;
619 if (sk->sk_state != TCP_ESTABLISHED) {
626 __set_current_state(TASK_RUNNING);
627 remove_wait_queue(sk->sk_sleep, &wait);
631 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
632 int addr_len, int flags)
634 struct sock *sk = sock->sk;
635 struct x25_opt *x25 = x25_sk(sk);
636 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
637 struct x25_route *rt;
641 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
642 sock->state = SS_CONNECTED;
643 goto out; /* Connect completed during a ERESTARTSYS event */
647 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
648 sock->state = SS_UNCONNECTED;
652 rc = -EISCONN; /* No reconnect on a seqpacket socket */
653 if (sk->sk_state == TCP_ESTABLISHED)
656 sk->sk_state = TCP_CLOSE;
657 sock->state = SS_UNCONNECTED;
660 if (addr_len != sizeof(struct sockaddr_x25) ||
661 addr->sx25_family != AF_X25)
665 rt = x25_get_route(&addr->sx25_addr);
669 x25->neighbour = x25_get_neigh(rt->dev);
673 x25_limit_facilities(&x25->facilities, x25->neighbour);
675 x25->lci = x25_new_lci(x25->neighbour);
680 if (sk->sk_zapped) /* Must bind first - autobinding does not work */
683 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
684 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
686 x25->dest_addr = addr->sx25_addr;
688 /* Move to connecting socket, start sending Connect Requests */
689 sock->state = SS_CONNECTING;
690 sk->sk_state = TCP_SYN_SENT;
692 x25->state = X25_STATE_1;
694 x25_write_internal(sk, X25_CALL_REQUEST);
696 x25_start_heartbeat(sk);
697 x25_start_t21timer(sk);
701 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
704 rc = x25_wait_for_connection_establishment(sk);
708 sock->state = SS_CONNECTED;
712 x25_neigh_put(x25->neighbour);
720 static int x25_wait_for_data(struct sock *sk, int timeout)
722 DECLARE_WAITQUEUE(wait, current);
725 add_wait_queue_exclusive(sk->sk_sleep, &wait);
727 __set_current_state(TASK_INTERRUPTIBLE);
728 if (sk->sk_shutdown & RCV_SHUTDOWN)
731 if (signal_pending(current))
737 if (skb_queue_empty(&sk->sk_receive_queue)) {
739 timeout = schedule_timeout(timeout);
744 __set_current_state(TASK_RUNNING);
745 remove_wait_queue(sk->sk_sleep, &wait);
749 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
751 struct sock *sk = sock->sk;
756 if (!sk || sk->sk_state != TCP_LISTEN)
760 if (sk->sk_type != SOCK_SEQPACKET)
764 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
767 skb = skb_dequeue(&sk->sk_receive_queue);
772 newsk->sk_socket = newsock;
773 newsk->sk_sleep = &newsock->wait;
775 /* Now attach up the new socket */
778 sk->sk_ack_backlog--;
780 newsock->state = SS_CONNECTED;
788 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
789 int *uaddr_len, int peer)
791 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
792 struct sock *sk = sock->sk;
793 struct x25_opt *x25 = x25_sk(sk);
796 if (sk->sk_state != TCP_ESTABLISHED)
798 sx25->sx25_addr = x25->dest_addr;
800 sx25->sx25_addr = x25->source_addr;
802 sx25->sx25_family = AF_X25;
803 *uaddr_len = sizeof(*sx25);
808 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
813 struct x25_opt *makex25;
814 struct x25_address source_addr, dest_addr;
815 struct x25_facilities facilities;
819 * Remove the LCI and frame type.
821 skb_pull(skb, X25_STD_MIN_LEN);
824 * Extract the X.25 addresses and convert them to ASCII strings,
827 skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
830 * Find a listener for the particular address.
832 sk = x25_find_listener(&source_addr);
835 * We can't accept the Call Request.
837 if (!sk || sk->sk_ack_backlog == sk->sk_max_ack_backlog)
838 goto out_clear_request;
841 * Try to reach a compromise on the requested facilities.
843 if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
847 * current neighbour/link might impose additional limits
848 * on certain facilties
851 x25_limit_facilities(&facilities, nb);
854 * Try to create a new socket.
856 make = x25_make_new(sk);
861 * Remove the facilities, leaving any Call User Data.
866 make->sk_state = TCP_ESTABLISHED;
868 makex25 = x25_sk(make);
870 makex25->dest_addr = dest_addr;
871 makex25->source_addr = source_addr;
872 makex25->neighbour = nb;
873 makex25->facilities = facilities;
874 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
876 x25_write_internal(make, X25_CALL_ACCEPTED);
879 * Incoming Call User Data.
882 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
883 makex25->calluserdata.cudlength = skb->len;
886 makex25->state = X25_STATE_3;
888 sk->sk_ack_backlog++;
890 x25_insert_socket(make);
892 skb_queue_head(&sk->sk_receive_queue, skb);
894 x25_start_heartbeat(make);
896 if (!sock_flag(sk, SOCK_DEAD))
897 sk->sk_data_ready(sk, skb->len);
906 x25_transmit_clear_request(nb, lci, 0x01);
910 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
911 struct msghdr *msg, size_t len)
913 struct sock *sk = sock->sk;
914 struct x25_opt *x25 = x25_sk(sk);
915 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
916 struct sockaddr_x25 sx25;
918 unsigned char *asmptr;
919 int noblock = msg->msg_flags & MSG_DONTWAIT;
921 int qbit = 0, rc = -EINVAL;
923 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
926 /* we currently don't support segmented records at the user interface */
927 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
935 if (sk->sk_shutdown & SEND_SHUTDOWN) {
936 send_sig(SIGPIPE, current, 0);
946 if (msg->msg_namelen < sizeof(sx25))
948 memcpy(&sx25, usx25, sizeof(sx25));
950 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
953 if (sx25.sx25_family != AF_X25)
957 * FIXME 1003.1g - if the socket is like this because
958 * it has become closed (not started closed) we ought
962 if (sk->sk_state != TCP_ESTABLISHED)
965 sx25.sx25_family = AF_X25;
966 sx25.sx25_addr = x25->dest_addr;
969 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
972 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
974 if ((msg->msg_flags & MSG_OOB) && len > 32)
977 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
979 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
982 X25_SKB_CB(skb)->flags = msg->msg_flags;
984 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
987 * Put the data on the end
989 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
991 asmptr = skb->h.raw = skb_put(skb, len);
993 rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
998 * If the Q BIT Include socket option is in force, the first
999 * byte of the user data is the logical value of the Q Bit.
1001 if (x25->qbitincl) {
1002 qbit = skb->data[0];
1007 * Push down the X.25 header
1009 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1011 if (msg->msg_flags & MSG_OOB) {
1012 if (x25->neighbour->extended) {
1013 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1014 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1015 *asmptr++ = (x25->lci >> 0) & 0xFF;
1016 *asmptr++ = X25_INTERRUPT;
1018 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1019 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1020 *asmptr++ = (x25->lci >> 0) & 0xFF;
1021 *asmptr++ = X25_INTERRUPT;
1024 if (x25->neighbour->extended) {
1025 /* Build an Extended X.25 header */
1026 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1027 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1028 *asmptr++ = (x25->lci >> 0) & 0xFF;
1029 *asmptr++ = X25_DATA;
1030 *asmptr++ = X25_DATA;
1032 /* Build an Standard X.25 header */
1033 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1034 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1035 *asmptr++ = (x25->lci >> 0) & 0xFF;
1036 *asmptr++ = X25_DATA;
1040 skb->data[0] |= X25_Q_BIT;
1043 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1044 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1047 if (sk->sk_state != TCP_ESTABLISHED)
1050 if (msg->msg_flags & MSG_OOB)
1051 skb_queue_tail(&x25->interrupt_out_queue, skb);
1053 len = x25_output(sk, skb);
1056 else if (x25->qbitincl)
1061 * lock_sock() is currently only used to serialize this x25_kick()
1062 * against input-driven x25_kick() calls. It currently only blocks
1063 * incoming packets for this socket and does not protect against
1064 * any other socket state changes and is not called from anywhere
1065 * else. As x25_kick() cannot block and as long as all socket
1066 * operations are BKL-wrapped, we don't need take to care about
1067 * purging the backlog queue in x25_release().
1069 * Using lock_sock() to protect all socket operations entirely
1070 * (and making the whole x25 stack SMP aware) unfortunately would
1071 * require major changes to {send,recv}msg and skb allocation methods.
1086 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1087 struct msghdr *msg, size_t size,
1090 struct sock *sk = sock->sk;
1091 struct x25_opt *x25 = x25_sk(sk);
1092 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1095 struct sk_buff *skb;
1096 unsigned char *asmptr;
1100 * This works for seqpacket too. The receiver has ordered the queue for
1101 * us! We do one quick check first though
1103 if (sk->sk_state != TCP_ESTABLISHED)
1106 if (flags & MSG_OOB) {
1108 if (sock_flag(sk, SOCK_URGINLINE) ||
1109 !skb_peek(&x25->interrupt_in_queue))
1112 skb = skb_dequeue(&x25->interrupt_in_queue);
1114 skb_pull(skb, X25_STD_MIN_LEN);
1117 * No Q bit information on Interrupt data.
1119 if (x25->qbitincl) {
1120 asmptr = skb_push(skb, 1);
1124 msg->msg_flags |= MSG_OOB;
1126 /* Now we can treat all alike */
1127 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1128 flags & MSG_DONTWAIT, &rc);
1132 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1134 skb_pull(skb, x25->neighbour->extended ?
1135 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1137 if (x25->qbitincl) {
1138 asmptr = skb_push(skb, 1);
1143 skb->h.raw = skb->data;
1147 if (copied > size) {
1149 msg->msg_flags |= MSG_TRUNC;
1152 /* Currently, each datagram always contains a complete record */
1153 msg->msg_flags |= MSG_EOR;
1155 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1157 goto out_free_dgram;
1160 sx25->sx25_family = AF_X25;
1161 sx25->sx25_addr = x25->dest_addr;
1164 msg->msg_namelen = sizeof(struct sockaddr_x25);
1171 skb_free_datagram(sk, skb);
1177 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1179 struct sock *sk = sock->sk;
1180 struct x25_opt *x25 = x25_sk(sk);
1181 void __user *argp = (void __user *)arg;
1186 int amount = sk->sk_sndbuf -
1187 atomic_read(&sk->sk_wmem_alloc);
1190 rc = put_user(amount, (unsigned int __user *)argp);
1195 struct sk_buff *skb;
1198 * These two are safe on a single CPU system as
1199 * only user tasks fiddle here
1201 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1203 rc = put_user(amount, (unsigned int __user *)argp);
1210 rc = sock_get_timestamp(sk,
1211 (struct timeval __user *)argp);
1215 case SIOCGIFDSTADDR:
1216 case SIOCSIFDSTADDR:
1217 case SIOCGIFBRDADDR:
1218 case SIOCSIFBRDADDR:
1219 case SIOCGIFNETMASK:
1220 case SIOCSIFNETMASK:
1228 if (!capable(CAP_NET_ADMIN))
1230 rc = x25_route_ioctl(cmd, argp);
1232 case SIOCX25GSUBSCRIP:
1233 rc = x25_subscr_ioctl(cmd, argp);
1235 case SIOCX25SSUBSCRIP:
1237 if (!capable(CAP_NET_ADMIN))
1239 rc = x25_subscr_ioctl(cmd, argp);
1241 case SIOCX25GFACILITIES: {
1242 struct x25_facilities fac = x25->facilities;
1243 rc = copy_to_user(argp, &fac,
1244 sizeof(fac)) ? -EFAULT : 0;
1248 case SIOCX25SFACILITIES: {
1249 struct x25_facilities facilities;
1251 if (copy_from_user(&facilities, argp,
1252 sizeof(facilities)))
1255 if (sk->sk_state != TCP_LISTEN &&
1256 sk->sk_state != TCP_CLOSE)
1258 if (facilities.pacsize_in < X25_PS16 ||
1259 facilities.pacsize_in > X25_PS4096)
1261 if (facilities.pacsize_out < X25_PS16 ||
1262 facilities.pacsize_out > X25_PS4096)
1264 if (facilities.winsize_in < 1 ||
1265 facilities.winsize_in > 127)
1267 if (facilities.throughput < 0x03 ||
1268 facilities.throughput > 0xDD)
1270 if (facilities.reverse && facilities.reverse != 1)
1272 x25->facilities = facilities;
1277 case SIOCX25GCALLUSERDATA: {
1278 struct x25_calluserdata cud = x25->calluserdata;
1279 rc = copy_to_user(argp, &cud,
1280 sizeof(cud)) ? -EFAULT : 0;
1284 case SIOCX25SCALLUSERDATA: {
1285 struct x25_calluserdata calluserdata;
1288 if (copy_from_user(&calluserdata, argp,
1289 sizeof(calluserdata)))
1292 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1294 x25->calluserdata = calluserdata;
1299 case SIOCX25GCAUSEDIAG: {
1300 struct x25_causediag causediag;
1301 causediag = x25->causediag;
1302 rc = copy_to_user(argp, &causediag,
1303 sizeof(causediag)) ? -EFAULT : 0;
1308 rc = dev_ioctl(cmd, argp);
1315 struct net_proto_family x25_family_ops = {
1317 .create = x25_create,
1318 .owner = THIS_MODULE,
1321 static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1323 .owner = THIS_MODULE,
1324 .release = x25_release,
1326 .connect = x25_connect,
1327 .socketpair = sock_no_socketpair,
1328 .accept = x25_accept,
1329 .getname = x25_getname,
1330 .poll = datagram_poll,
1332 .listen = x25_listen,
1333 .shutdown = sock_no_shutdown,
1334 .setsockopt = x25_setsockopt,
1335 .getsockopt = x25_getsockopt,
1336 .sendmsg = x25_sendmsg,
1337 .recvmsg = x25_recvmsg,
1338 .mmap = sock_no_mmap,
1339 .sendpage = sock_no_sendpage,
1342 #include <linux/smp_lock.h>
1343 SOCKOPS_WRAP(x25_proto, AF_X25);
1345 static struct packet_type x25_packet_type = {
1346 .type = __constant_htons(ETH_P_X25),
1347 .func = x25_lapb_receive_frame,
1350 struct notifier_block x25_dev_notifier = {
1351 .notifier_call = x25_device_event,
1354 void x25_kill_by_neigh(struct x25_neigh *nb)
1357 struct hlist_node *node;
1359 write_lock_bh(&x25_list_lock);
1361 sk_for_each(s, node, &x25_list)
1362 if (x25_sk(s)->neighbour == nb)
1363 x25_disconnect(s, ENETUNREACH, 0, 0);
1365 write_unlock_bh(&x25_list_lock);
1368 static int __init x25_init(void)
1370 sock_register(&x25_family_ops);
1372 dev_add_pack(&x25_packet_type);
1374 register_netdevice_notifier(&x25_dev_notifier);
1376 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1378 #ifdef CONFIG_SYSCTL
1379 x25_register_sysctl();
1384 module_init(x25_init);
1386 static void __exit x25_exit(void)
1392 #ifdef CONFIG_SYSCTL
1393 x25_unregister_sysctl();
1396 unregister_netdevice_notifier(&x25_dev_notifier);
1398 dev_remove_pack(&x25_packet_type);
1400 sock_unregister(AF_X25);
1402 module_exit(x25_exit);
1404 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1405 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1406 MODULE_LICENSE("GPL");
1407 MODULE_ALIAS_NETPROTO(PF_X25);