1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * X.25 Packet Layer release 002
5 * This is ALPHA test software. This code may break your machine,
6 * randomly fail to work with new releases, misbehave and/or generally
7 * screw up. It might even work.
9 * This code REQUIRES 2.1.15 or higher
12 * X.25 001 Jonathan Naylor Started coding.
13 * X.25 002 Jonathan Naylor Centralised disconnect handling.
14 * New timer architecture.
15 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant.
16 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of
17 * facilities negotiation and increased
18 * the throughput upper limit.
19 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups
20 * 2000-09-04 Henner Eisen Set sock->state in x25_accept().
21 * Fixed x25_output() related skb leakage.
22 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket.
23 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation.
24 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN
25 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
26 * x25_proc.c, using seq_file
27 * 2005-04-02 Shaun Pereira Selective sub address matching
29 * 2005-04-15 Shaun Pereira Fast select with no restriction on
33 #define pr_fmt(fmt) "X25: " fmt
35 #include <linux/module.h>
36 #include <linux/capability.h>
37 #include <linux/errno.h>
38 #include <linux/kernel.h>
39 #include <linux/sched/signal.h>
40 #include <linux/timer.h>
41 #include <linux/string.h>
42 #include <linux/net.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/slab.h>
48 #include <net/tcp_states.h>
49 #include <linux/uaccess.h>
50 #include <linux/fcntl.h>
51 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
52 #include <linux/notifier.h>
53 #include <linux/init.h>
54 #include <linux/compat.h>
55 #include <linux/ctype.h>
58 #include <net/compat.h>
60 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
61 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
62 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
63 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
64 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
65 int sysctl_x25_forward = 0;
68 DEFINE_RWLOCK(x25_list_lock);
70 static const struct proto_ops x25_proto_ops;
72 static const struct x25_address null_x25_address = {" "};
75 struct compat_x25_subscrip_struct {
76 char device[200-sizeof(compat_ulong_t)];
77 compat_ulong_t global_facil_mask;
78 compat_uint_t extended;
83 int x25_parse_address_block(struct sk_buff *skb,
84 struct x25_address *called_addr,
85 struct x25_address *calling_addr)
91 if (!pskb_may_pull(skb, 1)) {
92 /* packet has no address block */
98 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
100 if (!pskb_may_pull(skb, needed)) {
101 /* packet is too short to hold the addresses it claims
107 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
110 *called_addr->x25_addr = 0;
111 *calling_addr->x25_addr = 0;
117 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
118 struct x25_address *calling_addr)
120 unsigned int called_len, calling_len;
121 char *called, *calling;
124 called_len = (*p >> 0) & 0x0F;
125 calling_len = (*p >> 4) & 0x0F;
127 called = called_addr->x25_addr;
128 calling = calling_addr->x25_addr;
131 for (i = 0; i < (called_len + calling_len); i++) {
132 if (i < called_len) {
134 *called++ = ((*p >> 0) & 0x0F) + '0';
137 *called++ = ((*p >> 4) & 0x0F) + '0';
141 *calling++ = ((*p >> 0) & 0x0F) + '0';
144 *calling++ = ((*p >> 4) & 0x0F) + '0';
149 *called = *calling = '\0';
151 return 1 + (called_len + calling_len + 1) / 2;
154 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
155 struct x25_address *calling_addr)
157 unsigned int called_len, calling_len;
158 char *called, *calling;
161 called = called_addr->x25_addr;
162 calling = calling_addr->x25_addr;
164 called_len = strlen(called);
165 calling_len = strlen(calling);
167 *p++ = (calling_len << 4) | (called_len << 0);
169 for (i = 0; i < (called_len + calling_len); i++) {
170 if (i < called_len) {
172 *p |= (*called++ - '0') << 0;
176 *p |= (*called++ - '0') << 4;
180 *p |= (*calling++ - '0') << 0;
184 *p |= (*calling++ - '0') << 4;
189 return 1 + (called_len + calling_len + 1) / 2;
193 * Socket removal during an interrupt is now safe.
195 static void x25_remove_socket(struct sock *sk)
197 write_lock_bh(&x25_list_lock);
198 sk_del_node_init(sk);
199 write_unlock_bh(&x25_list_lock);
203 * Kill all bound sockets on a dropped device.
205 static void x25_kill_by_device(struct net_device *dev)
209 write_lock_bh(&x25_list_lock);
211 sk_for_each(s, &x25_list)
212 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
213 x25_disconnect(s, ENETUNREACH, 0, 0);
215 write_unlock_bh(&x25_list_lock);
219 * Handle device status changes.
221 static int x25_device_event(struct notifier_block *this, unsigned long event,
224 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
225 struct x25_neigh *nb;
227 if (!net_eq(dev_net(dev), &init_net))
230 if (dev->type == ARPHRD_X25
231 #if IS_ENABLED(CONFIG_LLC)
232 || dev->type == ARPHRD_ETHER
237 x25_link_device_up(dev);
239 case NETDEV_GOING_DOWN:
240 nb = x25_get_neigh(dev);
242 x25_terminate_link(nb);
247 x25_kill_by_device(dev);
248 x25_route_device_down(dev);
249 x25_link_device_down(dev);
258 * Add a socket to the bound sockets list.
260 static void x25_insert_socket(struct sock *sk)
262 write_lock_bh(&x25_list_lock);
263 sk_add_node(sk, &x25_list);
264 write_unlock_bh(&x25_list_lock);
268 * Find a socket that wants to accept the Call Request we just
269 * received. Check the full list for an address/cud match.
270 * If no cuds match return the next_best thing, an address match.
271 * Note: if a listening socket has cud set it must only get calls
274 static struct sock *x25_find_listener(struct x25_address *addr,
278 struct sock *next_best;
280 read_lock_bh(&x25_list_lock);
283 sk_for_each(s, &x25_list)
284 if ((!strcmp(addr->x25_addr,
285 x25_sk(s)->source_addr.x25_addr) ||
286 !strcmp(x25_sk(s)->source_addr.x25_addr,
287 null_x25_address.x25_addr)) &&
288 s->sk_state == TCP_LISTEN) {
290 * Found a listening socket, now check the incoming
291 * call user data vs this sockets call user data
293 if (x25_sk(s)->cudmatchlength > 0 &&
294 skb->len >= x25_sk(s)->cudmatchlength) {
295 if((memcmp(x25_sk(s)->calluserdata.cuddata,
297 x25_sk(s)->cudmatchlength)) == 0) {
311 read_unlock_bh(&x25_list_lock);
316 * Find a connected X.25 socket given my LCI and neighbour.
318 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
322 sk_for_each(s, &x25_list)
323 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
332 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
336 read_lock_bh(&x25_list_lock);
337 s = __x25_find_socket(lci, nb);
338 read_unlock_bh(&x25_list_lock);
343 * Find a unique LCI for a given device.
345 static unsigned int x25_new_lci(struct x25_neigh *nb)
347 unsigned int lci = 1;
350 while ((sk = x25_find_socket(lci, nb)) != NULL) {
365 static void __x25_destroy_socket(struct sock *);
368 * handler for deferred kills.
370 static void x25_destroy_timer(struct timer_list *t)
372 struct sock *sk = from_timer(sk, t, sk_timer);
374 x25_destroy_socket_from_timer(sk);
378 * This is called from user mode and the timers. Thus it protects itself
379 * against interrupt users but doesn't worry about being called during
380 * work. Once it is removed from the queue no interrupt or bottom half
381 * will touch it and we are (fairly 8-) ) safe.
382 * Not static as it's used by the timer
384 static void __x25_destroy_socket(struct sock *sk)
388 x25_stop_heartbeat(sk);
391 x25_remove_socket(sk);
392 x25_clear_queues(sk); /* Flush the queues */
394 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
395 if (skb->sk != sk) { /* A pending connection */
397 * Queue the unaccepted socket for death
399 skb->sk->sk_state = TCP_LISTEN;
400 sock_set_flag(skb->sk, SOCK_DEAD);
401 x25_start_heartbeat(skb->sk);
402 x25_sk(skb->sk)->state = X25_STATE_0;
408 if (sk_has_allocations(sk)) {
409 /* Defer: outstanding buffers */
410 sk->sk_timer.expires = jiffies + 10 * HZ;
411 sk->sk_timer.function = x25_destroy_timer;
412 add_timer(&sk->sk_timer);
414 /* drop last reference so sock_put will free */
419 void x25_destroy_socket_from_timer(struct sock *sk)
423 __x25_destroy_socket(sk);
429 * Handling for system calls applied via the various interfaces to a
430 * X.25 socket object.
433 static int x25_setsockopt(struct socket *sock, int level, int optname,
434 char __user *optval, unsigned int optlen)
437 struct sock *sk = sock->sk;
438 int rc = -ENOPROTOOPT;
440 if (level != SOL_X25 || optname != X25_QBITINCL)
444 if (optlen < sizeof(int))
448 if (get_user(opt, (int __user *)optval))
452 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
454 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
460 static int x25_getsockopt(struct socket *sock, int level, int optname,
461 char __user *optval, int __user *optlen)
463 struct sock *sk = sock->sk;
464 int val, len, rc = -ENOPROTOOPT;
466 if (level != SOL_X25 || optname != X25_QBITINCL)
470 if (get_user(len, optlen))
473 len = min_t(unsigned int, len, sizeof(int));
480 if (put_user(len, optlen))
483 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
484 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
489 static int x25_listen(struct socket *sock, int backlog)
491 struct sock *sk = sock->sk;
492 int rc = -EOPNOTSUPP;
495 if (sock->state != SS_UNCONNECTED) {
501 if (sk->sk_state != TCP_LISTEN) {
502 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
503 sk->sk_max_ack_backlog = backlog;
504 sk->sk_state = TCP_LISTEN;
512 static struct proto x25_proto = {
514 .owner = THIS_MODULE,
515 .obj_size = sizeof(struct x25_sock),
518 static struct sock *x25_alloc_socket(struct net *net, int kern)
520 struct x25_sock *x25;
521 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
526 sock_init_data(NULL, sk);
529 skb_queue_head_init(&x25->ack_queue);
530 skb_queue_head_init(&x25->fragment_queue);
531 skb_queue_head_init(&x25->interrupt_in_queue);
532 skb_queue_head_init(&x25->interrupt_out_queue);
537 static int x25_create(struct net *net, struct socket *sock, int protocol,
541 struct x25_sock *x25;
542 int rc = -EAFNOSUPPORT;
544 if (!net_eq(net, &init_net))
547 rc = -ESOCKTNOSUPPORT;
548 if (sock->type != SOCK_SEQPACKET)
556 if ((sk = x25_alloc_socket(net, kern)) == NULL)
561 sock_init_data(sock, sk);
565 sock->ops = &x25_proto_ops;
566 sk->sk_protocol = protocol;
567 sk->sk_backlog_rcv = x25_backlog_rcv;
569 x25->t21 = sysctl_x25_call_request_timeout;
570 x25->t22 = sysctl_x25_reset_request_timeout;
571 x25->t23 = sysctl_x25_clear_request_timeout;
572 x25->t2 = sysctl_x25_ack_holdback_timeout;
573 x25->state = X25_STATE_0;
574 x25->cudmatchlength = 0;
575 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
578 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
579 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
580 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
581 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
582 x25->facilities.throughput = 0; /* by default don't negotiate
584 x25->facilities.reverse = X25_DEFAULT_REVERSE;
585 x25->dte_facilities.calling_len = 0;
586 x25->dte_facilities.called_len = 0;
587 memset(x25->dte_facilities.called_ae, '\0',
588 sizeof(x25->dte_facilities.called_ae));
589 memset(x25->dte_facilities.calling_ae, '\0',
590 sizeof(x25->dte_facilities.calling_ae));
597 static struct sock *x25_make_new(struct sock *osk)
599 struct sock *sk = NULL;
600 struct x25_sock *x25, *ox25;
602 if (osk->sk_type != SOCK_SEQPACKET)
605 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
610 sk->sk_type = osk->sk_type;
611 sk->sk_priority = osk->sk_priority;
612 sk->sk_protocol = osk->sk_protocol;
613 sk->sk_rcvbuf = osk->sk_rcvbuf;
614 sk->sk_sndbuf = osk->sk_sndbuf;
615 sk->sk_state = TCP_ESTABLISHED;
616 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
617 sock_copy_flags(sk, osk);
620 x25->t21 = ox25->t21;
621 x25->t22 = ox25->t22;
622 x25->t23 = ox25->t23;
624 x25->flags = ox25->flags;
625 x25->facilities = ox25->facilities;
626 x25->dte_facilities = ox25->dte_facilities;
627 x25->cudmatchlength = ox25->cudmatchlength;
629 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
635 static int x25_release(struct socket *sock)
637 struct sock *sk = sock->sk;
638 struct x25_sock *x25;
647 switch (x25->state) {
651 x25_disconnect(sk, 0, 0, 0);
652 __x25_destroy_socket(sk);
658 x25_clear_queues(sk);
659 x25_write_internal(sk, X25_CLEAR_REQUEST);
660 x25_start_t23timer(sk);
661 x25->state = X25_STATE_2;
662 sk->sk_state = TCP_CLOSE;
663 sk->sk_shutdown |= SEND_SHUTDOWN;
664 sk->sk_state_change(sk);
665 sock_set_flag(sk, SOCK_DEAD);
666 sock_set_flag(sk, SOCK_DESTROY);
677 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
679 struct sock *sk = sock->sk;
680 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
683 if (addr_len != sizeof(struct sockaddr_x25) ||
684 addr->sx25_family != AF_X25 ||
685 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
690 /* check for the null_x25_address */
691 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
693 len = strlen(addr->sx25_addr.x25_addr);
694 for (i = 0; i < len; i++) {
695 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
703 if (sock_flag(sk, SOCK_ZAPPED)) {
704 x25_sk(sk)->source_addr = addr->sx25_addr;
705 x25_insert_socket(sk);
706 sock_reset_flag(sk, SOCK_ZAPPED);
711 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
716 static int x25_wait_for_connection_establishment(struct sock *sk)
718 DECLARE_WAITQUEUE(wait, current);
721 add_wait_queue_exclusive(sk_sleep(sk), &wait);
723 __set_current_state(TASK_INTERRUPTIBLE);
725 if (signal_pending(current))
729 sk->sk_socket->state = SS_UNCONNECTED;
733 if (sk->sk_state != TCP_ESTABLISHED) {
740 __set_current_state(TASK_RUNNING);
741 remove_wait_queue(sk_sleep(sk), &wait);
745 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
746 int addr_len, int flags)
748 struct sock *sk = sock->sk;
749 struct x25_sock *x25 = x25_sk(sk);
750 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
751 struct x25_route *rt;
755 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
756 sock->state = SS_CONNECTED;
757 goto out; /* Connect completed during a ERESTARTSYS event */
761 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
762 sock->state = SS_UNCONNECTED;
766 rc = -EISCONN; /* No reconnect on a seqpacket socket */
767 if (sk->sk_state == TCP_ESTABLISHED)
770 rc = -EALREADY; /* Do nothing if call is already in progress */
771 if (sk->sk_state == TCP_SYN_SENT)
774 sk->sk_state = TCP_CLOSE;
775 sock->state = SS_UNCONNECTED;
778 if (addr_len != sizeof(struct sockaddr_x25) ||
779 addr->sx25_family != AF_X25 ||
780 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
784 rt = x25_get_route(&addr->sx25_addr);
788 x25->neighbour = x25_get_neigh(rt->dev);
792 x25_limit_facilities(&x25->facilities, x25->neighbour);
794 x25->lci = x25_new_lci(x25->neighbour);
799 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
802 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
803 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
805 x25->dest_addr = addr->sx25_addr;
807 /* Move to connecting socket, start sending Connect Requests */
808 sock->state = SS_CONNECTING;
809 sk->sk_state = TCP_SYN_SENT;
811 x25->state = X25_STATE_1;
813 x25_write_internal(sk, X25_CALL_REQUEST);
815 x25_start_heartbeat(sk);
816 x25_start_t21timer(sk);
820 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
823 rc = x25_wait_for_connection_establishment(sk);
827 sock->state = SS_CONNECTED;
830 if (rc && x25->neighbour) {
831 read_lock_bh(&x25_list_lock);
832 x25_neigh_put(x25->neighbour);
833 x25->neighbour = NULL;
834 read_unlock_bh(&x25_list_lock);
835 x25->state = X25_STATE_0;
844 static int x25_wait_for_data(struct sock *sk, long timeout)
846 DECLARE_WAITQUEUE(wait, current);
849 add_wait_queue_exclusive(sk_sleep(sk), &wait);
851 __set_current_state(TASK_INTERRUPTIBLE);
852 if (sk->sk_shutdown & RCV_SHUTDOWN)
855 if (signal_pending(current))
861 if (skb_queue_empty(&sk->sk_receive_queue)) {
863 timeout = schedule_timeout(timeout);
868 __set_current_state(TASK_RUNNING);
869 remove_wait_queue(sk_sleep(sk), &wait);
873 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
876 struct sock *sk = sock->sk;
885 if (sk->sk_type != SOCK_SEQPACKET)
890 if (sk->sk_state != TCP_LISTEN)
893 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
896 skb = skb_dequeue(&sk->sk_receive_queue);
901 sock_graft(newsk, newsock);
903 /* Now attach up the new socket */
906 sk->sk_ack_backlog--;
907 newsock->state = SS_CONNECTED;
915 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
918 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
919 struct sock *sk = sock->sk;
920 struct x25_sock *x25 = x25_sk(sk);
924 if (sk->sk_state != TCP_ESTABLISHED) {
928 sx25->sx25_addr = x25->dest_addr;
930 sx25->sx25_addr = x25->source_addr;
932 sx25->sx25_family = AF_X25;
939 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
944 struct x25_sock *makex25;
945 struct x25_address source_addr, dest_addr;
946 struct x25_facilities facilities;
947 struct x25_dte_facilities dte_facilities;
948 int len, addr_len, rc;
951 * Remove the LCI and frame type.
953 skb_pull(skb, X25_STD_MIN_LEN);
956 * Extract the X.25 addresses and convert them to ASCII strings,
959 * Address block is mandatory in call request packets
961 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
963 goto out_clear_request;
964 skb_pull(skb, addr_len);
967 * Get the length of the facilities, skip past them for the moment
968 * get the call user data because this is needed to determine
969 * the correct listener
971 * Facilities length is mandatory in call request packets
973 if (!pskb_may_pull(skb, 1))
974 goto out_clear_request;
975 len = skb->data[0] + 1;
976 if (!pskb_may_pull(skb, len))
977 goto out_clear_request;
981 * Ensure that the amount of call user data is valid.
983 if (skb->len > X25_MAX_CUD_LEN)
984 goto out_clear_request;
987 * Get all the call user data so it can be used in
988 * x25_find_listener and skb_copy_from_linear_data up ahead.
990 if (!pskb_may_pull(skb, skb->len))
991 goto out_clear_request;
994 * Find a listener for the particular address/cud pair.
996 sk = x25_find_listener(&source_addr,skb);
999 if (sk != NULL && sk_acceptq_is_full(sk)) {
1004 * We dont have any listeners for this incoming call.
1005 * Try forwarding it.
1008 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1009 if (sysctl_x25_forward &&
1010 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1012 /* Call was forwarded, dont process it any more */
1017 /* No listeners, can't forward, clear the call */
1018 goto out_clear_request;
1023 * Try to reach a compromise on the requested facilities.
1025 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1030 * current neighbour/link might impose additional limits
1031 * on certain facilties
1034 x25_limit_facilities(&facilities, nb);
1037 * Try to create a new socket.
1039 make = x25_make_new(sk);
1044 * Remove the facilities
1049 make->sk_state = TCP_ESTABLISHED;
1051 makex25 = x25_sk(make);
1053 makex25->dest_addr = dest_addr;
1054 makex25->source_addr = source_addr;
1056 makex25->neighbour = nb;
1057 makex25->facilities = facilities;
1058 makex25->dte_facilities= dte_facilities;
1059 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1060 /* ensure no reverse facil on accept */
1061 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1062 /* ensure no calling address extension on accept */
1063 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1064 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1066 /* Normally all calls are accepted immediately */
1067 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1068 x25_write_internal(make, X25_CALL_ACCEPTED);
1069 makex25->state = X25_STATE_3;
1073 * Incoming Call User Data.
1075 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1076 makex25->calluserdata.cudlength = skb->len;
1078 sk->sk_ack_backlog++;
1080 x25_insert_socket(make);
1082 skb_queue_head(&sk->sk_receive_queue, skb);
1084 x25_start_heartbeat(make);
1086 if (!sock_flag(sk, SOCK_DEAD))
1087 sk->sk_data_ready(sk);
1096 x25_transmit_clear_request(nb, lci, 0x01);
1100 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1102 struct sock *sk = sock->sk;
1103 struct x25_sock *x25 = x25_sk(sk);
1104 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1105 struct sockaddr_x25 sx25;
1106 struct sk_buff *skb;
1107 unsigned char *asmptr;
1108 int noblock = msg->msg_flags & MSG_DONTWAIT;
1110 int qbit = 0, rc = -EINVAL;
1113 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1116 /* we currently don't support segmented records at the user interface */
1117 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1120 rc = -EADDRNOTAVAIL;
1121 if (sock_flag(sk, SOCK_ZAPPED))
1125 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1126 send_sig(SIGPIPE, current, 0);
1131 if (!x25->neighbour)
1136 if (msg->msg_namelen < sizeof(sx25))
1138 memcpy(&sx25, usx25, sizeof(sx25));
1140 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1143 if (sx25.sx25_family != AF_X25)
1147 * FIXME 1003.1g - if the socket is like this because
1148 * it has become closed (not started closed) we ought
1149 * to SIGPIPE, EPIPE;
1152 if (sk->sk_state != TCP_ESTABLISHED)
1155 sx25.sx25_family = AF_X25;
1156 sx25.sx25_addr = x25->dest_addr;
1159 /* Sanity check the packet size */
1165 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1167 /* Build a packet */
1168 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1170 if ((msg->msg_flags & MSG_OOB) && len > 32)
1173 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1176 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1180 X25_SKB_CB(skb)->flags = msg->msg_flags;
1182 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1185 * Put the data on the end
1187 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1189 skb_reset_transport_header(skb);
1192 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1197 * If the Q BIT Include socket option is in force, the first
1198 * byte of the user data is the logical value of the Q Bit.
1200 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1201 if (!pskb_may_pull(skb, 1))
1204 qbit = skb->data[0];
1209 * Push down the X.25 header
1211 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1213 if (msg->msg_flags & MSG_OOB) {
1214 if (x25->neighbour->extended) {
1215 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1216 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1217 *asmptr++ = (x25->lci >> 0) & 0xFF;
1218 *asmptr++ = X25_INTERRUPT;
1220 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1221 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1222 *asmptr++ = (x25->lci >> 0) & 0xFF;
1223 *asmptr++ = X25_INTERRUPT;
1226 if (x25->neighbour->extended) {
1227 /* Build an Extended X.25 header */
1228 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1229 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1230 *asmptr++ = (x25->lci >> 0) & 0xFF;
1231 *asmptr++ = X25_DATA;
1232 *asmptr++ = X25_DATA;
1234 /* Build an Standard X.25 header */
1235 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1236 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1237 *asmptr++ = (x25->lci >> 0) & 0xFF;
1238 *asmptr++ = X25_DATA;
1242 skb->data[0] |= X25_Q_BIT;
1245 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1246 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1249 if (sk->sk_state != TCP_ESTABLISHED)
1252 if (msg->msg_flags & MSG_OOB)
1253 skb_queue_tail(&x25->interrupt_out_queue, skb);
1255 rc = x25_output(sk, skb);
1259 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1274 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1277 struct sock *sk = sock->sk;
1278 struct x25_sock *x25 = x25_sk(sk);
1279 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1281 int qbit, header_len;
1282 struct sk_buff *skb;
1283 unsigned char *asmptr;
1288 if (x25->neighbour == NULL)
1291 header_len = x25->neighbour->extended ?
1292 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1295 * This works for seqpacket too. The receiver has ordered the queue for
1296 * us! We do one quick check first though
1298 if (sk->sk_state != TCP_ESTABLISHED)
1301 if (flags & MSG_OOB) {
1303 if (sock_flag(sk, SOCK_URGINLINE) ||
1304 !skb_peek(&x25->interrupt_in_queue))
1307 skb = skb_dequeue(&x25->interrupt_in_queue);
1309 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1310 goto out_free_dgram;
1312 skb_pull(skb, X25_STD_MIN_LEN);
1315 * No Q bit information on Interrupt data.
1317 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1318 asmptr = skb_push(skb, 1);
1322 msg->msg_flags |= MSG_OOB;
1324 /* Now we can treat all alike */
1326 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1327 flags & MSG_DONTWAIT, &rc);
1332 if (!pskb_may_pull(skb, header_len))
1333 goto out_free_dgram;
1335 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1337 skb_pull(skb, header_len);
1339 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1340 asmptr = skb_push(skb, 1);
1345 skb_reset_transport_header(skb);
1348 if (copied > size) {
1350 msg->msg_flags |= MSG_TRUNC;
1353 /* Currently, each datagram always contains a complete record */
1354 msg->msg_flags |= MSG_EOR;
1356 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1358 goto out_free_dgram;
1361 sx25->sx25_family = AF_X25;
1362 sx25->sx25_addr = x25->dest_addr;
1363 msg->msg_namelen = sizeof(*sx25);
1369 skb_free_datagram(sk, skb);
1376 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1378 struct sock *sk = sock->sk;
1379 struct x25_sock *x25 = x25_sk(sk);
1380 void __user *argp = (void __user *)arg;
1387 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1390 rc = put_user(amount, (unsigned int __user *)argp);
1395 struct sk_buff *skb;
1398 * These two are safe on a single CPU system as
1399 * only user tasks fiddle here
1402 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1405 rc = put_user(amount, (unsigned int __user *)argp);
1411 case SIOCGIFDSTADDR:
1412 case SIOCSIFDSTADDR:
1413 case SIOCGIFBRDADDR:
1414 case SIOCSIFBRDADDR:
1415 case SIOCGIFNETMASK:
1416 case SIOCSIFNETMASK:
1424 if (!capable(CAP_NET_ADMIN))
1426 rc = x25_route_ioctl(cmd, argp);
1428 case SIOCX25GSUBSCRIP:
1429 rc = x25_subscr_ioctl(cmd, argp);
1431 case SIOCX25SSUBSCRIP:
1433 if (!capable(CAP_NET_ADMIN))
1435 rc = x25_subscr_ioctl(cmd, argp);
1437 case SIOCX25GFACILITIES: {
1439 rc = copy_to_user(argp, &x25->facilities,
1440 sizeof(x25->facilities))
1446 case SIOCX25SFACILITIES: {
1447 struct x25_facilities facilities;
1449 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1453 if (sk->sk_state != TCP_LISTEN &&
1454 sk->sk_state != TCP_CLOSE)
1455 goto out_fac_release;
1456 if (facilities.pacsize_in < X25_PS16 ||
1457 facilities.pacsize_in > X25_PS4096)
1458 goto out_fac_release;
1459 if (facilities.pacsize_out < X25_PS16 ||
1460 facilities.pacsize_out > X25_PS4096)
1461 goto out_fac_release;
1462 if (facilities.winsize_in < 1 ||
1463 facilities.winsize_in > 127)
1464 goto out_fac_release;
1465 if (facilities.throughput) {
1466 int out = facilities.throughput & 0xf0;
1467 int in = facilities.throughput & 0x0f;
1469 facilities.throughput |=
1470 X25_DEFAULT_THROUGHPUT << 4;
1471 else if (out < 0x30 || out > 0xD0)
1472 goto out_fac_release;
1474 facilities.throughput |=
1475 X25_DEFAULT_THROUGHPUT;
1476 else if (in < 0x03 || in > 0x0D)
1477 goto out_fac_release;
1479 if (facilities.reverse &&
1480 (facilities.reverse & 0x81) != 0x81)
1481 goto out_fac_release;
1482 x25->facilities = facilities;
1489 case SIOCX25GDTEFACILITIES: {
1491 rc = copy_to_user(argp, &x25->dte_facilities,
1492 sizeof(x25->dte_facilities));
1499 case SIOCX25SDTEFACILITIES: {
1500 struct x25_dte_facilities dtefacs;
1502 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1506 if (sk->sk_state != TCP_LISTEN &&
1507 sk->sk_state != TCP_CLOSE)
1508 goto out_dtefac_release;
1509 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1510 goto out_dtefac_release;
1511 if (dtefacs.called_len > X25_MAX_AE_LEN)
1512 goto out_dtefac_release;
1513 x25->dte_facilities = dtefacs;
1520 case SIOCX25GCALLUSERDATA: {
1522 rc = copy_to_user(argp, &x25->calluserdata,
1523 sizeof(x25->calluserdata))
1529 case SIOCX25SCALLUSERDATA: {
1530 struct x25_calluserdata calluserdata;
1533 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1536 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1539 x25->calluserdata = calluserdata;
1545 case SIOCX25GCAUSEDIAG: {
1547 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1553 case SIOCX25SCAUSEDIAG: {
1554 struct x25_causediag causediag;
1556 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1559 x25->causediag = causediag;
1566 case SIOCX25SCUDMATCHLEN: {
1567 struct x25_subaddr sub_addr;
1570 if(sk->sk_state != TCP_CLOSE)
1571 goto out_cud_release;
1573 if (copy_from_user(&sub_addr, argp,
1575 goto out_cud_release;
1577 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1578 goto out_cud_release;
1579 x25->cudmatchlength = sub_addr.cudmatchlength;
1586 case SIOCX25CALLACCPTAPPRV: {
1589 if (sk->sk_state == TCP_CLOSE) {
1590 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1597 case SIOCX25SENDCALLACCPT: {
1600 if (sk->sk_state != TCP_ESTABLISHED)
1601 goto out_sendcallaccpt_release;
1602 /* must call accptapprv above */
1603 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1604 goto out_sendcallaccpt_release;
1605 x25_write_internal(sk, X25_CALL_ACCEPTED);
1606 x25->state = X25_STATE_3;
1608 out_sendcallaccpt_release:
1621 static const struct net_proto_family x25_family_ops = {
1623 .create = x25_create,
1624 .owner = THIS_MODULE,
1627 #ifdef CONFIG_COMPAT
1628 static int compat_x25_subscr_ioctl(unsigned int cmd,
1629 struct compat_x25_subscrip_struct __user *x25_subscr32)
1631 struct compat_x25_subscrip_struct x25_subscr;
1632 struct x25_neigh *nb;
1633 struct net_device *dev;
1637 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1641 dev = x25_dev_get(x25_subscr.device);
1645 nb = x25_get_neigh(dev);
1651 if (cmd == SIOCX25GSUBSCRIP) {
1652 read_lock_bh(&x25_neigh_list_lock);
1653 x25_subscr.extended = nb->extended;
1654 x25_subscr.global_facil_mask = nb->global_facil_mask;
1655 read_unlock_bh(&x25_neigh_list_lock);
1656 rc = copy_to_user(x25_subscr32, &x25_subscr,
1657 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1660 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1662 write_lock_bh(&x25_neigh_list_lock);
1663 nb->extended = x25_subscr.extended;
1664 nb->global_facil_mask = x25_subscr.global_facil_mask;
1665 write_unlock_bh(&x25_neigh_list_lock);
1676 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1679 void __user *argp = compat_ptr(arg);
1680 int rc = -ENOIOCTLCMD;
1685 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1689 case SIOCGIFDSTADDR:
1690 case SIOCSIFDSTADDR:
1691 case SIOCGIFBRDADDR:
1692 case SIOCSIFBRDADDR:
1693 case SIOCGIFNETMASK:
1694 case SIOCSIFNETMASK:
1702 if (!capable(CAP_NET_ADMIN))
1704 rc = x25_route_ioctl(cmd, argp);
1706 case SIOCX25GSUBSCRIP:
1707 rc = compat_x25_subscr_ioctl(cmd, argp);
1709 case SIOCX25SSUBSCRIP:
1711 if (!capable(CAP_NET_ADMIN))
1713 rc = compat_x25_subscr_ioctl(cmd, argp);
1715 case SIOCX25GFACILITIES:
1716 case SIOCX25SFACILITIES:
1717 case SIOCX25GDTEFACILITIES:
1718 case SIOCX25SDTEFACILITIES:
1719 case SIOCX25GCALLUSERDATA:
1720 case SIOCX25SCALLUSERDATA:
1721 case SIOCX25GCAUSEDIAG:
1722 case SIOCX25SCAUSEDIAG:
1723 case SIOCX25SCUDMATCHLEN:
1724 case SIOCX25CALLACCPTAPPRV:
1725 case SIOCX25SENDCALLACCPT:
1726 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1736 static const struct proto_ops x25_proto_ops = {
1738 .owner = THIS_MODULE,
1739 .release = x25_release,
1741 .connect = x25_connect,
1742 .socketpair = sock_no_socketpair,
1743 .accept = x25_accept,
1744 .getname = x25_getname,
1745 .poll = datagram_poll,
1747 #ifdef CONFIG_COMPAT
1748 .compat_ioctl = compat_x25_ioctl,
1750 .gettstamp = sock_gettstamp,
1751 .listen = x25_listen,
1752 .shutdown = sock_no_shutdown,
1753 .setsockopt = x25_setsockopt,
1754 .getsockopt = x25_getsockopt,
1755 .sendmsg = x25_sendmsg,
1756 .recvmsg = x25_recvmsg,
1757 .mmap = sock_no_mmap,
1758 .sendpage = sock_no_sendpage,
1761 static struct packet_type x25_packet_type __read_mostly = {
1762 .type = cpu_to_be16(ETH_P_X25),
1763 .func = x25_lapb_receive_frame,
1766 static struct notifier_block x25_dev_notifier = {
1767 .notifier_call = x25_device_event,
1770 void x25_kill_by_neigh(struct x25_neigh *nb)
1774 write_lock_bh(&x25_list_lock);
1776 sk_for_each(s, &x25_list) {
1777 if (x25_sk(s)->neighbour == nb) {
1778 write_unlock_bh(&x25_list_lock);
1780 x25_disconnect(s, ENETUNREACH, 0, 0);
1782 write_lock_bh(&x25_list_lock);
1785 write_unlock_bh(&x25_list_lock);
1787 /* Remove any related forwards */
1788 x25_clear_forward_by_dev(nb->dev);
1791 static int __init x25_init(void)
1795 rc = proto_register(&x25_proto, 0);
1799 rc = sock_register(&x25_family_ops);
1803 dev_add_pack(&x25_packet_type);
1805 rc = register_netdevice_notifier(&x25_dev_notifier);
1809 rc = x25_register_sysctl();
1813 rc = x25_proc_init();
1817 pr_info("Linux Version 0.2\n");
1822 x25_unregister_sysctl();
1824 unregister_netdevice_notifier(&x25_dev_notifier);
1826 dev_remove_pack(&x25_packet_type);
1827 sock_unregister(AF_X25);
1829 proto_unregister(&x25_proto);
1832 module_init(x25_init);
1834 static void __exit x25_exit(void)
1840 x25_unregister_sysctl();
1842 unregister_netdevice_notifier(&x25_dev_notifier);
1844 dev_remove_pack(&x25_packet_type);
1846 sock_unregister(AF_X25);
1847 proto_unregister(&x25_proto);
1849 module_exit(x25_exit);
1851 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1852 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1853 MODULE_LICENSE("GPL");
1854 MODULE_ALIAS_NETPROTO(PF_X25);