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 (sk->sk_state != TCP_LISTEN) {
496 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
497 sk->sk_max_ack_backlog = backlog;
498 sk->sk_state = TCP_LISTEN;
506 static struct proto x25_proto = {
508 .owner = THIS_MODULE,
509 .obj_size = sizeof(struct x25_sock),
512 static struct sock *x25_alloc_socket(struct net *net, int kern)
514 struct x25_sock *x25;
515 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
520 sock_init_data(NULL, sk);
523 skb_queue_head_init(&x25->ack_queue);
524 skb_queue_head_init(&x25->fragment_queue);
525 skb_queue_head_init(&x25->interrupt_in_queue);
526 skb_queue_head_init(&x25->interrupt_out_queue);
531 static int x25_create(struct net *net, struct socket *sock, int protocol,
535 struct x25_sock *x25;
536 int rc = -EAFNOSUPPORT;
538 if (!net_eq(net, &init_net))
541 rc = -ESOCKTNOSUPPORT;
542 if (sock->type != SOCK_SEQPACKET)
550 if ((sk = x25_alloc_socket(net, kern)) == NULL)
555 sock_init_data(sock, sk);
559 sock->ops = &x25_proto_ops;
560 sk->sk_protocol = protocol;
561 sk->sk_backlog_rcv = x25_backlog_rcv;
563 x25->t21 = sysctl_x25_call_request_timeout;
564 x25->t22 = sysctl_x25_reset_request_timeout;
565 x25->t23 = sysctl_x25_clear_request_timeout;
566 x25->t2 = sysctl_x25_ack_holdback_timeout;
567 x25->state = X25_STATE_0;
568 x25->cudmatchlength = 0;
569 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
572 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
573 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
574 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
575 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
576 x25->facilities.throughput = 0; /* by default don't negotiate
578 x25->facilities.reverse = X25_DEFAULT_REVERSE;
579 x25->dte_facilities.calling_len = 0;
580 x25->dte_facilities.called_len = 0;
581 memset(x25->dte_facilities.called_ae, '\0',
582 sizeof(x25->dte_facilities.called_ae));
583 memset(x25->dte_facilities.calling_ae, '\0',
584 sizeof(x25->dte_facilities.calling_ae));
591 static struct sock *x25_make_new(struct sock *osk)
593 struct sock *sk = NULL;
594 struct x25_sock *x25, *ox25;
596 if (osk->sk_type != SOCK_SEQPACKET)
599 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
604 sk->sk_type = osk->sk_type;
605 sk->sk_priority = osk->sk_priority;
606 sk->sk_protocol = osk->sk_protocol;
607 sk->sk_rcvbuf = osk->sk_rcvbuf;
608 sk->sk_sndbuf = osk->sk_sndbuf;
609 sk->sk_state = TCP_ESTABLISHED;
610 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
611 sock_copy_flags(sk, osk);
614 x25->t21 = ox25->t21;
615 x25->t22 = ox25->t22;
616 x25->t23 = ox25->t23;
618 x25->flags = ox25->flags;
619 x25->facilities = ox25->facilities;
620 x25->dte_facilities = ox25->dte_facilities;
621 x25->cudmatchlength = ox25->cudmatchlength;
623 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
629 static int x25_release(struct socket *sock)
631 struct sock *sk = sock->sk;
632 struct x25_sock *x25;
641 switch (x25->state) {
645 x25_disconnect(sk, 0, 0, 0);
646 __x25_destroy_socket(sk);
652 x25_clear_queues(sk);
653 x25_write_internal(sk, X25_CLEAR_REQUEST);
654 x25_start_t23timer(sk);
655 x25->state = X25_STATE_2;
656 sk->sk_state = TCP_CLOSE;
657 sk->sk_shutdown |= SEND_SHUTDOWN;
658 sk->sk_state_change(sk);
659 sock_set_flag(sk, SOCK_DEAD);
660 sock_set_flag(sk, SOCK_DESTROY);
671 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
673 struct sock *sk = sock->sk;
674 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
677 if (addr_len != sizeof(struct sockaddr_x25) ||
678 addr->sx25_family != AF_X25 ||
679 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
684 /* check for the null_x25_address */
685 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
687 len = strlen(addr->sx25_addr.x25_addr);
688 for (i = 0; i < len; i++) {
689 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
697 if (sock_flag(sk, SOCK_ZAPPED)) {
698 x25_sk(sk)->source_addr = addr->sx25_addr;
699 x25_insert_socket(sk);
700 sock_reset_flag(sk, SOCK_ZAPPED);
705 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
710 static int x25_wait_for_connection_establishment(struct sock *sk)
712 DECLARE_WAITQUEUE(wait, current);
715 add_wait_queue_exclusive(sk_sleep(sk), &wait);
717 __set_current_state(TASK_INTERRUPTIBLE);
719 if (signal_pending(current))
723 sk->sk_socket->state = SS_UNCONNECTED;
727 if (sk->sk_state != TCP_ESTABLISHED) {
734 __set_current_state(TASK_RUNNING);
735 remove_wait_queue(sk_sleep(sk), &wait);
739 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
740 int addr_len, int flags)
742 struct sock *sk = sock->sk;
743 struct x25_sock *x25 = x25_sk(sk);
744 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
745 struct x25_route *rt;
749 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
750 sock->state = SS_CONNECTED;
751 goto out; /* Connect completed during a ERESTARTSYS event */
755 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
756 sock->state = SS_UNCONNECTED;
760 rc = -EISCONN; /* No reconnect on a seqpacket socket */
761 if (sk->sk_state == TCP_ESTABLISHED)
764 rc = -EALREADY; /* Do nothing if call is already in progress */
765 if (sk->sk_state == TCP_SYN_SENT)
768 sk->sk_state = TCP_CLOSE;
769 sock->state = SS_UNCONNECTED;
772 if (addr_len != sizeof(struct sockaddr_x25) ||
773 addr->sx25_family != AF_X25 ||
774 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
778 rt = x25_get_route(&addr->sx25_addr);
782 x25->neighbour = x25_get_neigh(rt->dev);
786 x25_limit_facilities(&x25->facilities, x25->neighbour);
788 x25->lci = x25_new_lci(x25->neighbour);
793 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
796 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
797 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
799 x25->dest_addr = addr->sx25_addr;
801 /* Move to connecting socket, start sending Connect Requests */
802 sock->state = SS_CONNECTING;
803 sk->sk_state = TCP_SYN_SENT;
805 x25->state = X25_STATE_1;
807 x25_write_internal(sk, X25_CALL_REQUEST);
809 x25_start_heartbeat(sk);
810 x25_start_t21timer(sk);
814 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
817 rc = x25_wait_for_connection_establishment(sk);
821 sock->state = SS_CONNECTED;
824 if (rc && x25->neighbour) {
825 read_lock_bh(&x25_list_lock);
826 x25_neigh_put(x25->neighbour);
827 x25->neighbour = NULL;
828 read_unlock_bh(&x25_list_lock);
829 x25->state = X25_STATE_0;
838 static int x25_wait_for_data(struct sock *sk, long timeout)
840 DECLARE_WAITQUEUE(wait, current);
843 add_wait_queue_exclusive(sk_sleep(sk), &wait);
845 __set_current_state(TASK_INTERRUPTIBLE);
846 if (sk->sk_shutdown & RCV_SHUTDOWN)
849 if (signal_pending(current))
855 if (skb_queue_empty(&sk->sk_receive_queue)) {
857 timeout = schedule_timeout(timeout);
862 __set_current_state(TASK_RUNNING);
863 remove_wait_queue(sk_sleep(sk), &wait);
867 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
870 struct sock *sk = sock->sk;
879 if (sk->sk_type != SOCK_SEQPACKET)
884 if (sk->sk_state != TCP_LISTEN)
887 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
890 skb = skb_dequeue(&sk->sk_receive_queue);
895 sock_graft(newsk, newsock);
897 /* Now attach up the new socket */
900 sk->sk_ack_backlog--;
901 newsock->state = SS_CONNECTED;
909 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
912 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
913 struct sock *sk = sock->sk;
914 struct x25_sock *x25 = x25_sk(sk);
918 if (sk->sk_state != TCP_ESTABLISHED) {
922 sx25->sx25_addr = x25->dest_addr;
924 sx25->sx25_addr = x25->source_addr;
926 sx25->sx25_family = AF_X25;
933 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
938 struct x25_sock *makex25;
939 struct x25_address source_addr, dest_addr;
940 struct x25_facilities facilities;
941 struct x25_dte_facilities dte_facilities;
942 int len, addr_len, rc;
945 * Remove the LCI and frame type.
947 skb_pull(skb, X25_STD_MIN_LEN);
950 * Extract the X.25 addresses and convert them to ASCII strings,
953 * Address block is mandatory in call request packets
955 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
957 goto out_clear_request;
958 skb_pull(skb, addr_len);
961 * Get the length of the facilities, skip past them for the moment
962 * get the call user data because this is needed to determine
963 * the correct listener
965 * Facilities length is mandatory in call request packets
967 if (!pskb_may_pull(skb, 1))
968 goto out_clear_request;
969 len = skb->data[0] + 1;
970 if (!pskb_may_pull(skb, len))
971 goto out_clear_request;
975 * Ensure that the amount of call user data is valid.
977 if (skb->len > X25_MAX_CUD_LEN)
978 goto out_clear_request;
981 * Get all the call user data so it can be used in
982 * x25_find_listener and skb_copy_from_linear_data up ahead.
984 if (!pskb_may_pull(skb, skb->len))
985 goto out_clear_request;
988 * Find a listener for the particular address/cud pair.
990 sk = x25_find_listener(&source_addr,skb);
993 if (sk != NULL && sk_acceptq_is_full(sk)) {
998 * We dont have any listeners for this incoming call.
1002 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1003 if (sysctl_x25_forward &&
1004 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1006 /* Call was forwarded, dont process it any more */
1011 /* No listeners, can't forward, clear the call */
1012 goto out_clear_request;
1017 * Try to reach a compromise on the requested facilities.
1019 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1024 * current neighbour/link might impose additional limits
1025 * on certain facilties
1028 x25_limit_facilities(&facilities, nb);
1031 * Try to create a new socket.
1033 make = x25_make_new(sk);
1038 * Remove the facilities
1043 make->sk_state = TCP_ESTABLISHED;
1045 makex25 = x25_sk(make);
1047 makex25->dest_addr = dest_addr;
1048 makex25->source_addr = source_addr;
1050 makex25->neighbour = nb;
1051 makex25->facilities = facilities;
1052 makex25->dte_facilities= dte_facilities;
1053 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1054 /* ensure no reverse facil on accept */
1055 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1056 /* ensure no calling address extension on accept */
1057 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1058 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1060 /* Normally all calls are accepted immediately */
1061 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1062 x25_write_internal(make, X25_CALL_ACCEPTED);
1063 makex25->state = X25_STATE_3;
1067 * Incoming Call User Data.
1069 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1070 makex25->calluserdata.cudlength = skb->len;
1072 sk->sk_ack_backlog++;
1074 x25_insert_socket(make);
1076 skb_queue_head(&sk->sk_receive_queue, skb);
1078 x25_start_heartbeat(make);
1080 if (!sock_flag(sk, SOCK_DEAD))
1081 sk->sk_data_ready(sk);
1090 x25_transmit_clear_request(nb, lci, 0x01);
1094 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1096 struct sock *sk = sock->sk;
1097 struct x25_sock *x25 = x25_sk(sk);
1098 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1099 struct sockaddr_x25 sx25;
1100 struct sk_buff *skb;
1101 unsigned char *asmptr;
1102 int noblock = msg->msg_flags & MSG_DONTWAIT;
1104 int qbit = 0, rc = -EINVAL;
1107 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1110 /* we currently don't support segmented records at the user interface */
1111 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1114 rc = -EADDRNOTAVAIL;
1115 if (sock_flag(sk, SOCK_ZAPPED))
1119 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1120 send_sig(SIGPIPE, current, 0);
1125 if (!x25->neighbour)
1130 if (msg->msg_namelen < sizeof(sx25))
1132 memcpy(&sx25, usx25, sizeof(sx25));
1134 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1137 if (sx25.sx25_family != AF_X25)
1141 * FIXME 1003.1g - if the socket is like this because
1142 * it has become closed (not started closed) we ought
1143 * to SIGPIPE, EPIPE;
1146 if (sk->sk_state != TCP_ESTABLISHED)
1149 sx25.sx25_family = AF_X25;
1150 sx25.sx25_addr = x25->dest_addr;
1153 /* Sanity check the packet size */
1159 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1161 /* Build a packet */
1162 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1164 if ((msg->msg_flags & MSG_OOB) && len > 32)
1167 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1170 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1174 X25_SKB_CB(skb)->flags = msg->msg_flags;
1176 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1179 * Put the data on the end
1181 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1183 skb_reset_transport_header(skb);
1186 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1191 * If the Q BIT Include socket option is in force, the first
1192 * byte of the user data is the logical value of the Q Bit.
1194 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1195 if (!pskb_may_pull(skb, 1))
1198 qbit = skb->data[0];
1203 * Push down the X.25 header
1205 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1207 if (msg->msg_flags & MSG_OOB) {
1208 if (x25->neighbour->extended) {
1209 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1210 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1211 *asmptr++ = (x25->lci >> 0) & 0xFF;
1212 *asmptr++ = X25_INTERRUPT;
1214 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1215 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1216 *asmptr++ = (x25->lci >> 0) & 0xFF;
1217 *asmptr++ = X25_INTERRUPT;
1220 if (x25->neighbour->extended) {
1221 /* Build an Extended X.25 header */
1222 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1223 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1224 *asmptr++ = (x25->lci >> 0) & 0xFF;
1225 *asmptr++ = X25_DATA;
1226 *asmptr++ = X25_DATA;
1228 /* Build an Standard X.25 header */
1229 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1230 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1231 *asmptr++ = (x25->lci >> 0) & 0xFF;
1232 *asmptr++ = X25_DATA;
1236 skb->data[0] |= X25_Q_BIT;
1239 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1240 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1243 if (sk->sk_state != TCP_ESTABLISHED)
1246 if (msg->msg_flags & MSG_OOB)
1247 skb_queue_tail(&x25->interrupt_out_queue, skb);
1249 rc = x25_output(sk, skb);
1253 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1268 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1271 struct sock *sk = sock->sk;
1272 struct x25_sock *x25 = x25_sk(sk);
1273 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1275 int qbit, header_len;
1276 struct sk_buff *skb;
1277 unsigned char *asmptr;
1282 if (x25->neighbour == NULL)
1285 header_len = x25->neighbour->extended ?
1286 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1289 * This works for seqpacket too. The receiver has ordered the queue for
1290 * us! We do one quick check first though
1292 if (sk->sk_state != TCP_ESTABLISHED)
1295 if (flags & MSG_OOB) {
1297 if (sock_flag(sk, SOCK_URGINLINE) ||
1298 !skb_peek(&x25->interrupt_in_queue))
1301 skb = skb_dequeue(&x25->interrupt_in_queue);
1303 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1304 goto out_free_dgram;
1306 skb_pull(skb, X25_STD_MIN_LEN);
1309 * No Q bit information on Interrupt data.
1311 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1312 asmptr = skb_push(skb, 1);
1316 msg->msg_flags |= MSG_OOB;
1318 /* Now we can treat all alike */
1320 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1321 flags & MSG_DONTWAIT, &rc);
1326 if (!pskb_may_pull(skb, header_len))
1327 goto out_free_dgram;
1329 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1331 skb_pull(skb, header_len);
1333 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1334 asmptr = skb_push(skb, 1);
1339 skb_reset_transport_header(skb);
1342 if (copied > size) {
1344 msg->msg_flags |= MSG_TRUNC;
1347 /* Currently, each datagram always contains a complete record */
1348 msg->msg_flags |= MSG_EOR;
1350 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1352 goto out_free_dgram;
1355 sx25->sx25_family = AF_X25;
1356 sx25->sx25_addr = x25->dest_addr;
1357 msg->msg_namelen = sizeof(*sx25);
1363 skb_free_datagram(sk, skb);
1370 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1372 struct sock *sk = sock->sk;
1373 struct x25_sock *x25 = x25_sk(sk);
1374 void __user *argp = (void __user *)arg;
1381 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1384 rc = put_user(amount, (unsigned int __user *)argp);
1389 struct sk_buff *skb;
1392 * These two are safe on a single CPU system as
1393 * only user tasks fiddle here
1396 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1399 rc = put_user(amount, (unsigned int __user *)argp);
1405 case SIOCGIFDSTADDR:
1406 case SIOCSIFDSTADDR:
1407 case SIOCGIFBRDADDR:
1408 case SIOCSIFBRDADDR:
1409 case SIOCGIFNETMASK:
1410 case SIOCSIFNETMASK:
1418 if (!capable(CAP_NET_ADMIN))
1420 rc = x25_route_ioctl(cmd, argp);
1422 case SIOCX25GSUBSCRIP:
1423 rc = x25_subscr_ioctl(cmd, argp);
1425 case SIOCX25SSUBSCRIP:
1427 if (!capable(CAP_NET_ADMIN))
1429 rc = x25_subscr_ioctl(cmd, argp);
1431 case SIOCX25GFACILITIES: {
1433 rc = copy_to_user(argp, &x25->facilities,
1434 sizeof(x25->facilities))
1440 case SIOCX25SFACILITIES: {
1441 struct x25_facilities facilities;
1443 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1447 if (sk->sk_state != TCP_LISTEN &&
1448 sk->sk_state != TCP_CLOSE)
1449 goto out_fac_release;
1450 if (facilities.pacsize_in < X25_PS16 ||
1451 facilities.pacsize_in > X25_PS4096)
1452 goto out_fac_release;
1453 if (facilities.pacsize_out < X25_PS16 ||
1454 facilities.pacsize_out > X25_PS4096)
1455 goto out_fac_release;
1456 if (facilities.winsize_in < 1 ||
1457 facilities.winsize_in > 127)
1458 goto out_fac_release;
1459 if (facilities.throughput) {
1460 int out = facilities.throughput & 0xf0;
1461 int in = facilities.throughput & 0x0f;
1463 facilities.throughput |=
1464 X25_DEFAULT_THROUGHPUT << 4;
1465 else if (out < 0x30 || out > 0xD0)
1466 goto out_fac_release;
1468 facilities.throughput |=
1469 X25_DEFAULT_THROUGHPUT;
1470 else if (in < 0x03 || in > 0x0D)
1471 goto out_fac_release;
1473 if (facilities.reverse &&
1474 (facilities.reverse & 0x81) != 0x81)
1475 goto out_fac_release;
1476 x25->facilities = facilities;
1483 case SIOCX25GDTEFACILITIES: {
1485 rc = copy_to_user(argp, &x25->dte_facilities,
1486 sizeof(x25->dte_facilities));
1493 case SIOCX25SDTEFACILITIES: {
1494 struct x25_dte_facilities dtefacs;
1496 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1500 if (sk->sk_state != TCP_LISTEN &&
1501 sk->sk_state != TCP_CLOSE)
1502 goto out_dtefac_release;
1503 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1504 goto out_dtefac_release;
1505 if (dtefacs.called_len > X25_MAX_AE_LEN)
1506 goto out_dtefac_release;
1507 x25->dte_facilities = dtefacs;
1514 case SIOCX25GCALLUSERDATA: {
1516 rc = copy_to_user(argp, &x25->calluserdata,
1517 sizeof(x25->calluserdata))
1523 case SIOCX25SCALLUSERDATA: {
1524 struct x25_calluserdata calluserdata;
1527 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1530 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1533 x25->calluserdata = calluserdata;
1539 case SIOCX25GCAUSEDIAG: {
1541 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1547 case SIOCX25SCAUSEDIAG: {
1548 struct x25_causediag causediag;
1550 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1553 x25->causediag = causediag;
1560 case SIOCX25SCUDMATCHLEN: {
1561 struct x25_subaddr sub_addr;
1564 if(sk->sk_state != TCP_CLOSE)
1565 goto out_cud_release;
1567 if (copy_from_user(&sub_addr, argp,
1569 goto out_cud_release;
1571 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1572 goto out_cud_release;
1573 x25->cudmatchlength = sub_addr.cudmatchlength;
1580 case SIOCX25CALLACCPTAPPRV: {
1583 if (sk->sk_state == TCP_CLOSE) {
1584 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1591 case SIOCX25SENDCALLACCPT: {
1594 if (sk->sk_state != TCP_ESTABLISHED)
1595 goto out_sendcallaccpt_release;
1596 /* must call accptapprv above */
1597 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1598 goto out_sendcallaccpt_release;
1599 x25_write_internal(sk, X25_CALL_ACCEPTED);
1600 x25->state = X25_STATE_3;
1602 out_sendcallaccpt_release:
1615 static const struct net_proto_family x25_family_ops = {
1617 .create = x25_create,
1618 .owner = THIS_MODULE,
1621 #ifdef CONFIG_COMPAT
1622 static int compat_x25_subscr_ioctl(unsigned int cmd,
1623 struct compat_x25_subscrip_struct __user *x25_subscr32)
1625 struct compat_x25_subscrip_struct x25_subscr;
1626 struct x25_neigh *nb;
1627 struct net_device *dev;
1631 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1635 dev = x25_dev_get(x25_subscr.device);
1639 nb = x25_get_neigh(dev);
1645 if (cmd == SIOCX25GSUBSCRIP) {
1646 read_lock_bh(&x25_neigh_list_lock);
1647 x25_subscr.extended = nb->extended;
1648 x25_subscr.global_facil_mask = nb->global_facil_mask;
1649 read_unlock_bh(&x25_neigh_list_lock);
1650 rc = copy_to_user(x25_subscr32, &x25_subscr,
1651 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1654 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1656 write_lock_bh(&x25_neigh_list_lock);
1657 nb->extended = x25_subscr.extended;
1658 nb->global_facil_mask = x25_subscr.global_facil_mask;
1659 write_unlock_bh(&x25_neigh_list_lock);
1670 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1673 void __user *argp = compat_ptr(arg);
1674 int rc = -ENOIOCTLCMD;
1679 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1683 case SIOCGIFDSTADDR:
1684 case SIOCSIFDSTADDR:
1685 case SIOCGIFBRDADDR:
1686 case SIOCSIFBRDADDR:
1687 case SIOCGIFNETMASK:
1688 case SIOCSIFNETMASK:
1696 if (!capable(CAP_NET_ADMIN))
1698 rc = x25_route_ioctl(cmd, argp);
1700 case SIOCX25GSUBSCRIP:
1701 rc = compat_x25_subscr_ioctl(cmd, argp);
1703 case SIOCX25SSUBSCRIP:
1705 if (!capable(CAP_NET_ADMIN))
1707 rc = compat_x25_subscr_ioctl(cmd, argp);
1709 case SIOCX25GFACILITIES:
1710 case SIOCX25SFACILITIES:
1711 case SIOCX25GDTEFACILITIES:
1712 case SIOCX25SDTEFACILITIES:
1713 case SIOCX25GCALLUSERDATA:
1714 case SIOCX25SCALLUSERDATA:
1715 case SIOCX25GCAUSEDIAG:
1716 case SIOCX25SCAUSEDIAG:
1717 case SIOCX25SCUDMATCHLEN:
1718 case SIOCX25CALLACCPTAPPRV:
1719 case SIOCX25SENDCALLACCPT:
1720 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1730 static const struct proto_ops x25_proto_ops = {
1732 .owner = THIS_MODULE,
1733 .release = x25_release,
1735 .connect = x25_connect,
1736 .socketpair = sock_no_socketpair,
1737 .accept = x25_accept,
1738 .getname = x25_getname,
1739 .poll = datagram_poll,
1741 #ifdef CONFIG_COMPAT
1742 .compat_ioctl = compat_x25_ioctl,
1744 .gettstamp = sock_gettstamp,
1745 .listen = x25_listen,
1746 .shutdown = sock_no_shutdown,
1747 .setsockopt = x25_setsockopt,
1748 .getsockopt = x25_getsockopt,
1749 .sendmsg = x25_sendmsg,
1750 .recvmsg = x25_recvmsg,
1751 .mmap = sock_no_mmap,
1752 .sendpage = sock_no_sendpage,
1755 static struct packet_type x25_packet_type __read_mostly = {
1756 .type = cpu_to_be16(ETH_P_X25),
1757 .func = x25_lapb_receive_frame,
1760 static struct notifier_block x25_dev_notifier = {
1761 .notifier_call = x25_device_event,
1764 void x25_kill_by_neigh(struct x25_neigh *nb)
1768 write_lock_bh(&x25_list_lock);
1770 sk_for_each(s, &x25_list) {
1771 if (x25_sk(s)->neighbour == nb) {
1772 write_unlock_bh(&x25_list_lock);
1774 x25_disconnect(s, ENETUNREACH, 0, 0);
1776 write_lock_bh(&x25_list_lock);
1779 write_unlock_bh(&x25_list_lock);
1781 /* Remove any related forwards */
1782 x25_clear_forward_by_dev(nb->dev);
1785 static int __init x25_init(void)
1789 rc = proto_register(&x25_proto, 0);
1793 rc = sock_register(&x25_family_ops);
1797 dev_add_pack(&x25_packet_type);
1799 rc = register_netdevice_notifier(&x25_dev_notifier);
1803 rc = x25_register_sysctl();
1807 rc = x25_proc_init();
1811 pr_info("Linux Version 0.2\n");
1816 x25_unregister_sysctl();
1818 unregister_netdevice_notifier(&x25_dev_notifier);
1820 dev_remove_pack(&x25_packet_type);
1821 sock_unregister(AF_X25);
1823 proto_unregister(&x25_proto);
1826 module_init(x25_init);
1828 static void __exit x25_exit(void)
1834 x25_unregister_sysctl();
1836 unregister_netdevice_notifier(&x25_dev_notifier);
1838 dev_remove_pack(&x25_packet_type);
1840 sock_unregister(AF_X25);
1841 proto_unregister(&x25_proto);
1843 module_exit(x25_exit);
1845 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1846 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1847 MODULE_LICENSE("GPL");
1848 MODULE_ALIAS_NETPROTO(PF_X25);