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
32 * 2005-04-02 Shaun Pereira Selective sub address matching
34 * 2005-04-15 Shaun Pereira Fast select with no restriction on
38 #define pr_fmt(fmt) "X25: " fmt
40 #include <linux/module.h>
41 #include <linux/capability.h>
42 #include <linux/errno.h>
43 #include <linux/kernel.h>
44 #include <linux/sched/signal.h>
45 #include <linux/timer.h>
46 #include <linux/string.h>
47 #include <linux/net.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_arp.h>
50 #include <linux/skbuff.h>
51 #include <linux/slab.h>
53 #include <net/tcp_states.h>
54 #include <linux/uaccess.h>
55 #include <linux/fcntl.h>
56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
57 #include <linux/notifier.h>
58 #include <linux/init.h>
59 #include <linux/compat.h>
60 #include <linux/ctype.h>
63 #include <net/compat.h>
65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
66 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
67 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
68 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
69 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
70 int sysctl_x25_forward = 0;
73 DEFINE_RWLOCK(x25_list_lock);
75 static const struct proto_ops x25_proto_ops;
77 static const struct x25_address null_x25_address = {" "};
80 struct compat_x25_subscrip_struct {
81 char device[200-sizeof(compat_ulong_t)];
82 compat_ulong_t global_facil_mask;
83 compat_uint_t extended;
88 int x25_parse_address_block(struct sk_buff *skb,
89 struct x25_address *called_addr,
90 struct x25_address *calling_addr)
96 if (!pskb_may_pull(skb, 1)) {
97 /* packet has no address block */
103 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
105 if (!pskb_may_pull(skb, needed)) {
106 /* packet is too short to hold the addresses it claims
112 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
115 *called_addr->x25_addr = 0;
116 *calling_addr->x25_addr = 0;
122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
123 struct x25_address *calling_addr)
125 unsigned int called_len, calling_len;
126 char *called, *calling;
129 called_len = (*p >> 0) & 0x0F;
130 calling_len = (*p >> 4) & 0x0F;
132 called = called_addr->x25_addr;
133 calling = calling_addr->x25_addr;
136 for (i = 0; i < (called_len + calling_len); i++) {
137 if (i < called_len) {
139 *called++ = ((*p >> 0) & 0x0F) + '0';
142 *called++ = ((*p >> 4) & 0x0F) + '0';
146 *calling++ = ((*p >> 0) & 0x0F) + '0';
149 *calling++ = ((*p >> 4) & 0x0F) + '0';
154 *called = *calling = '\0';
156 return 1 + (called_len + calling_len + 1) / 2;
159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
160 struct x25_address *calling_addr)
162 unsigned int called_len, calling_len;
163 char *called, *calling;
166 called = called_addr->x25_addr;
167 calling = calling_addr->x25_addr;
169 called_len = strlen(called);
170 calling_len = strlen(calling);
172 *p++ = (calling_len << 4) | (called_len << 0);
174 for (i = 0; i < (called_len + calling_len); i++) {
175 if (i < called_len) {
177 *p |= (*called++ - '0') << 0;
181 *p |= (*called++ - '0') << 4;
185 *p |= (*calling++ - '0') << 0;
189 *p |= (*calling++ - '0') << 4;
194 return 1 + (called_len + calling_len + 1) / 2;
198 * Socket removal during an interrupt is now safe.
200 static void x25_remove_socket(struct sock *sk)
202 write_lock_bh(&x25_list_lock);
203 sk_del_node_init(sk);
204 write_unlock_bh(&x25_list_lock);
208 * Kill all bound sockets on a dropped device.
210 static void x25_kill_by_device(struct net_device *dev)
214 write_lock_bh(&x25_list_lock);
216 sk_for_each(s, &x25_list)
217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
218 x25_disconnect(s, ENETUNREACH, 0, 0);
220 write_unlock_bh(&x25_list_lock);
224 * Handle device status changes.
226 static int x25_device_event(struct notifier_block *this, unsigned long event,
229 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
230 struct x25_neigh *nb;
232 if (!net_eq(dev_net(dev), &init_net))
235 if (dev->type == ARPHRD_X25
236 #if IS_ENABLED(CONFIG_LLC)
237 || dev->type == ARPHRD_ETHER
242 x25_link_device_up(dev);
244 case NETDEV_GOING_DOWN:
245 nb = x25_get_neigh(dev);
247 x25_terminate_link(nb);
252 x25_kill_by_device(dev);
253 x25_route_device_down(dev);
254 x25_link_device_down(dev);
263 * Add a socket to the bound sockets list.
265 static void x25_insert_socket(struct sock *sk)
267 write_lock_bh(&x25_list_lock);
268 sk_add_node(sk, &x25_list);
269 write_unlock_bh(&x25_list_lock);
273 * Find a socket that wants to accept the Call Request we just
274 * received. Check the full list for an address/cud match.
275 * If no cuds match return the next_best thing, an address match.
276 * Note: if a listening socket has cud set it must only get calls
279 static struct sock *x25_find_listener(struct x25_address *addr,
283 struct sock *next_best;
285 read_lock_bh(&x25_list_lock);
288 sk_for_each(s, &x25_list)
289 if ((!strcmp(addr->x25_addr,
290 x25_sk(s)->source_addr.x25_addr) ||
291 !strcmp(x25_sk(s)->source_addr.x25_addr,
292 null_x25_address.x25_addr)) &&
293 s->sk_state == TCP_LISTEN) {
295 * Found a listening socket, now check the incoming
296 * call user data vs this sockets call user data
298 if (x25_sk(s)->cudmatchlength > 0 &&
299 skb->len >= x25_sk(s)->cudmatchlength) {
300 if((memcmp(x25_sk(s)->calluserdata.cuddata,
302 x25_sk(s)->cudmatchlength)) == 0) {
316 read_unlock_bh(&x25_list_lock);
321 * Find a connected X.25 socket given my LCI and neighbour.
323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
327 sk_for_each(s, &x25_list)
328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
341 read_lock_bh(&x25_list_lock);
342 s = __x25_find_socket(lci, nb);
343 read_unlock_bh(&x25_list_lock);
348 * Find a unique LCI for a given device.
350 static unsigned int x25_new_lci(struct x25_neigh *nb)
352 unsigned int lci = 1;
355 while ((sk = x25_find_socket(lci, nb)) != NULL) {
370 static void __x25_destroy_socket(struct sock *);
373 * handler for deferred kills.
375 static void x25_destroy_timer(unsigned long data)
377 x25_destroy_socket_from_timer((struct sock *)data);
381 * This is called from user mode and the timers. Thus it protects itself
382 * against interrupt users but doesn't worry about being called during
383 * work. Once it is removed from the queue no interrupt or bottom half
384 * will touch it and we are (fairly 8-) ) safe.
385 * Not static as it's used by the timer
387 static void __x25_destroy_socket(struct sock *sk)
391 x25_stop_heartbeat(sk);
394 x25_remove_socket(sk);
395 x25_clear_queues(sk); /* Flush the queues */
397 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
398 if (skb->sk != sk) { /* A pending connection */
400 * Queue the unaccepted socket for death
402 skb->sk->sk_state = TCP_LISTEN;
403 sock_set_flag(skb->sk, SOCK_DEAD);
404 x25_start_heartbeat(skb->sk);
405 x25_sk(skb->sk)->state = X25_STATE_0;
411 if (sk_has_allocations(sk)) {
412 /* Defer: outstanding buffers */
413 sk->sk_timer.expires = jiffies + 10 * HZ;
414 sk->sk_timer.function = x25_destroy_timer;
415 sk->sk_timer.data = (unsigned long)sk;
416 add_timer(&sk->sk_timer);
418 /* drop last reference so sock_put will free */
423 void x25_destroy_socket_from_timer(struct sock *sk)
427 __x25_destroy_socket(sk);
433 * Handling for system calls applied via the various interfaces to a
434 * X.25 socket object.
437 static int x25_setsockopt(struct socket *sock, int level, int optname,
438 char __user *optval, unsigned int optlen)
441 struct sock *sk = sock->sk;
442 int rc = -ENOPROTOOPT;
444 if (level != SOL_X25 || optname != X25_QBITINCL)
448 if (optlen < sizeof(int))
452 if (get_user(opt, (int __user *)optval))
456 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
458 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
464 static int x25_getsockopt(struct socket *sock, int level, int optname,
465 char __user *optval, int __user *optlen)
467 struct sock *sk = sock->sk;
468 int val, len, rc = -ENOPROTOOPT;
470 if (level != SOL_X25 || optname != X25_QBITINCL)
474 if (get_user(len, optlen))
477 len = min_t(unsigned int, len, sizeof(int));
484 if (put_user(len, optlen))
487 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
488 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
493 static int x25_listen(struct socket *sock, int backlog)
495 struct sock *sk = sock->sk;
496 int rc = -EOPNOTSUPP;
499 if (sk->sk_state != TCP_LISTEN) {
500 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
501 sk->sk_max_ack_backlog = backlog;
502 sk->sk_state = TCP_LISTEN;
510 static struct proto x25_proto = {
512 .owner = THIS_MODULE,
513 .obj_size = sizeof(struct x25_sock),
516 static struct sock *x25_alloc_socket(struct net *net, int kern)
518 struct x25_sock *x25;
519 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
524 sock_init_data(NULL, sk);
527 skb_queue_head_init(&x25->ack_queue);
528 skb_queue_head_init(&x25->fragment_queue);
529 skb_queue_head_init(&x25->interrupt_in_queue);
530 skb_queue_head_init(&x25->interrupt_out_queue);
535 static int x25_create(struct net *net, struct socket *sock, int protocol,
539 struct x25_sock *x25;
540 int rc = -EAFNOSUPPORT;
542 if (!net_eq(net, &init_net))
545 rc = -ESOCKTNOSUPPORT;
546 if (sock->type != SOCK_SEQPACKET)
554 if ((sk = x25_alloc_socket(net, kern)) == NULL)
559 sock_init_data(sock, sk);
563 sock->ops = &x25_proto_ops;
564 sk->sk_protocol = protocol;
565 sk->sk_backlog_rcv = x25_backlog_rcv;
567 x25->t21 = sysctl_x25_call_request_timeout;
568 x25->t22 = sysctl_x25_reset_request_timeout;
569 x25->t23 = sysctl_x25_clear_request_timeout;
570 x25->t2 = sysctl_x25_ack_holdback_timeout;
571 x25->state = X25_STATE_0;
572 x25->cudmatchlength = 0;
573 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
576 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
577 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
578 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
579 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
580 x25->facilities.throughput = 0; /* by default don't negotiate
582 x25->facilities.reverse = X25_DEFAULT_REVERSE;
583 x25->dte_facilities.calling_len = 0;
584 x25->dte_facilities.called_len = 0;
585 memset(x25->dte_facilities.called_ae, '\0',
586 sizeof(x25->dte_facilities.called_ae));
587 memset(x25->dte_facilities.calling_ae, '\0',
588 sizeof(x25->dte_facilities.calling_ae));
595 static struct sock *x25_make_new(struct sock *osk)
597 struct sock *sk = NULL;
598 struct x25_sock *x25, *ox25;
600 if (osk->sk_type != SOCK_SEQPACKET)
603 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
608 sk->sk_type = osk->sk_type;
609 sk->sk_priority = osk->sk_priority;
610 sk->sk_protocol = osk->sk_protocol;
611 sk->sk_rcvbuf = osk->sk_rcvbuf;
612 sk->sk_sndbuf = osk->sk_sndbuf;
613 sk->sk_state = TCP_ESTABLISHED;
614 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
615 sock_copy_flags(sk, osk);
618 x25->t21 = ox25->t21;
619 x25->t22 = ox25->t22;
620 x25->t23 = ox25->t23;
622 x25->flags = ox25->flags;
623 x25->facilities = ox25->facilities;
624 x25->dte_facilities = ox25->dte_facilities;
625 x25->cudmatchlength = ox25->cudmatchlength;
627 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
633 static int x25_release(struct socket *sock)
635 struct sock *sk = sock->sk;
636 struct x25_sock *x25;
645 switch (x25->state) {
649 x25_disconnect(sk, 0, 0, 0);
650 __x25_destroy_socket(sk);
656 x25_clear_queues(sk);
657 x25_write_internal(sk, X25_CLEAR_REQUEST);
658 x25_start_t23timer(sk);
659 x25->state = X25_STATE_2;
660 sk->sk_state = TCP_CLOSE;
661 sk->sk_shutdown |= SEND_SHUTDOWN;
662 sk->sk_state_change(sk);
663 sock_set_flag(sk, SOCK_DEAD);
664 sock_set_flag(sk, SOCK_DESTROY);
675 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
677 struct sock *sk = sock->sk;
678 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
681 if (addr_len != sizeof(struct sockaddr_x25) ||
682 addr->sx25_family != AF_X25 ||
683 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
688 /* check for the null_x25_address */
689 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
691 len = strlen(addr->sx25_addr.x25_addr);
692 for (i = 0; i < len; i++) {
693 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
701 if (sock_flag(sk, SOCK_ZAPPED)) {
702 x25_sk(sk)->source_addr = addr->sx25_addr;
703 x25_insert_socket(sk);
704 sock_reset_flag(sk, SOCK_ZAPPED);
709 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
714 static int x25_wait_for_connection_establishment(struct sock *sk)
716 DECLARE_WAITQUEUE(wait, current);
719 add_wait_queue_exclusive(sk_sleep(sk), &wait);
721 __set_current_state(TASK_INTERRUPTIBLE);
723 if (signal_pending(current))
727 sk->sk_socket->state = SS_UNCONNECTED;
731 if (sk->sk_state != TCP_ESTABLISHED) {
738 __set_current_state(TASK_RUNNING);
739 remove_wait_queue(sk_sleep(sk), &wait);
743 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
744 int addr_len, int flags)
746 struct sock *sk = sock->sk;
747 struct x25_sock *x25 = x25_sk(sk);
748 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
749 struct x25_route *rt;
753 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
754 sock->state = SS_CONNECTED;
755 goto out; /* Connect completed during a ERESTARTSYS event */
759 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
760 sock->state = SS_UNCONNECTED;
764 rc = -EISCONN; /* No reconnect on a seqpacket socket */
765 if (sk->sk_state == TCP_ESTABLISHED)
768 rc = -EALREADY; /* Do nothing if call is already in progress */
769 if (sk->sk_state == TCP_SYN_SENT)
772 sk->sk_state = TCP_CLOSE;
773 sock->state = SS_UNCONNECTED;
776 if (addr_len != sizeof(struct sockaddr_x25) ||
777 addr->sx25_family != AF_X25 ||
778 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
782 rt = x25_get_route(&addr->sx25_addr);
786 x25->neighbour = x25_get_neigh(rt->dev);
790 x25_limit_facilities(&x25->facilities, x25->neighbour);
792 x25->lci = x25_new_lci(x25->neighbour);
797 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
800 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
801 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
803 x25->dest_addr = addr->sx25_addr;
805 /* Move to connecting socket, start sending Connect Requests */
806 sock->state = SS_CONNECTING;
807 sk->sk_state = TCP_SYN_SENT;
809 x25->state = X25_STATE_1;
811 x25_write_internal(sk, X25_CALL_REQUEST);
813 x25_start_heartbeat(sk);
814 x25_start_t21timer(sk);
818 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
821 rc = x25_wait_for_connection_establishment(sk);
825 sock->state = SS_CONNECTED;
828 if (rc && x25->neighbour) {
829 read_lock_bh(&x25_list_lock);
830 x25_neigh_put(x25->neighbour);
831 x25->neighbour = NULL;
832 read_unlock_bh(&x25_list_lock);
833 x25->state = X25_STATE_0;
842 static int x25_wait_for_data(struct sock *sk, long timeout)
844 DECLARE_WAITQUEUE(wait, current);
847 add_wait_queue_exclusive(sk_sleep(sk), &wait);
849 __set_current_state(TASK_INTERRUPTIBLE);
850 if (sk->sk_shutdown & RCV_SHUTDOWN)
853 if (signal_pending(current))
859 if (skb_queue_empty(&sk->sk_receive_queue)) {
861 timeout = schedule_timeout(timeout);
866 __set_current_state(TASK_RUNNING);
867 remove_wait_queue(sk_sleep(sk), &wait);
871 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
874 struct sock *sk = sock->sk;
883 if (sk->sk_type != SOCK_SEQPACKET)
888 if (sk->sk_state != TCP_LISTEN)
891 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
894 skb = skb_dequeue(&sk->sk_receive_queue);
899 sock_graft(newsk, newsock);
901 /* Now attach up the new socket */
904 sk->sk_ack_backlog--;
905 newsock->state = SS_CONNECTED;
913 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
914 int *uaddr_len, int peer)
916 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
917 struct sock *sk = sock->sk;
918 struct x25_sock *x25 = x25_sk(sk);
922 if (sk->sk_state != TCP_ESTABLISHED) {
926 sx25->sx25_addr = x25->dest_addr;
928 sx25->sx25_addr = x25->source_addr;
930 sx25->sx25_family = AF_X25;
931 *uaddr_len = sizeof(*sx25);
937 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
942 struct x25_sock *makex25;
943 struct x25_address source_addr, dest_addr;
944 struct x25_facilities facilities;
945 struct x25_dte_facilities dte_facilities;
946 int len, addr_len, rc;
949 * Remove the LCI and frame type.
951 skb_pull(skb, X25_STD_MIN_LEN);
954 * Extract the X.25 addresses and convert them to ASCII strings,
957 * Address block is mandatory in call request packets
959 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
961 goto out_clear_request;
962 skb_pull(skb, addr_len);
965 * Get the length of the facilities, skip past them for the moment
966 * get the call user data because this is needed to determine
967 * the correct listener
969 * Facilities length is mandatory in call request packets
971 if (!pskb_may_pull(skb, 1))
972 goto out_clear_request;
973 len = skb->data[0] + 1;
974 if (!pskb_may_pull(skb, len))
975 goto out_clear_request;
979 * Ensure that the amount of call user data is valid.
981 if (skb->len > X25_MAX_CUD_LEN)
982 goto out_clear_request;
985 * Get all the call user data so it can be used in
986 * x25_find_listener and skb_copy_from_linear_data up ahead.
988 if (!pskb_may_pull(skb, skb->len))
989 goto out_clear_request;
992 * Find a listener for the particular address/cud pair.
994 sk = x25_find_listener(&source_addr,skb);
997 if (sk != NULL && sk_acceptq_is_full(sk)) {
1002 * We dont have any listeners for this incoming call.
1003 * Try forwarding it.
1006 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1007 if (sysctl_x25_forward &&
1008 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1010 /* Call was forwarded, dont process it any more */
1015 /* No listeners, can't forward, clear the call */
1016 goto out_clear_request;
1021 * Try to reach a compromise on the requested facilities.
1023 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1028 * current neighbour/link might impose additional limits
1029 * on certain facilties
1032 x25_limit_facilities(&facilities, nb);
1035 * Try to create a new socket.
1037 make = x25_make_new(sk);
1042 * Remove the facilities
1047 make->sk_state = TCP_ESTABLISHED;
1049 makex25 = x25_sk(make);
1051 makex25->dest_addr = dest_addr;
1052 makex25->source_addr = source_addr;
1054 makex25->neighbour = nb;
1055 makex25->facilities = facilities;
1056 makex25->dte_facilities= dte_facilities;
1057 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1058 /* ensure no reverse facil on accept */
1059 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1060 /* ensure no calling address extension on accept */
1061 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1062 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1064 /* Normally all calls are accepted immediately */
1065 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1066 x25_write_internal(make, X25_CALL_ACCEPTED);
1067 makex25->state = X25_STATE_3;
1071 * Incoming Call User Data.
1073 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1074 makex25->calluserdata.cudlength = skb->len;
1076 sk->sk_ack_backlog++;
1078 x25_insert_socket(make);
1080 skb_queue_head(&sk->sk_receive_queue, skb);
1082 x25_start_heartbeat(make);
1084 if (!sock_flag(sk, SOCK_DEAD))
1085 sk->sk_data_ready(sk);
1094 x25_transmit_clear_request(nb, lci, 0x01);
1098 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1100 struct sock *sk = sock->sk;
1101 struct x25_sock *x25 = x25_sk(sk);
1102 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1103 struct sockaddr_x25 sx25;
1104 struct sk_buff *skb;
1105 unsigned char *asmptr;
1106 int noblock = msg->msg_flags & MSG_DONTWAIT;
1108 int qbit = 0, rc = -EINVAL;
1111 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1114 /* we currently don't support segmented records at the user interface */
1115 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1118 rc = -EADDRNOTAVAIL;
1119 if (sock_flag(sk, SOCK_ZAPPED))
1123 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1124 send_sig(SIGPIPE, current, 0);
1129 if (!x25->neighbour)
1134 if (msg->msg_namelen < sizeof(sx25))
1136 memcpy(&sx25, usx25, sizeof(sx25));
1138 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1141 if (sx25.sx25_family != AF_X25)
1145 * FIXME 1003.1g - if the socket is like this because
1146 * it has become closed (not started closed) we ought
1147 * to SIGPIPE, EPIPE;
1150 if (sk->sk_state != TCP_ESTABLISHED)
1153 sx25.sx25_family = AF_X25;
1154 sx25.sx25_addr = x25->dest_addr;
1157 /* Sanity check the packet size */
1163 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1165 /* Build a packet */
1166 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1168 if ((msg->msg_flags & MSG_OOB) && len > 32)
1171 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1174 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1178 X25_SKB_CB(skb)->flags = msg->msg_flags;
1180 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1183 * Put the data on the end
1185 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1187 skb_reset_transport_header(skb);
1190 rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1195 * If the Q BIT Include socket option is in force, the first
1196 * byte of the user data is the logical value of the Q Bit.
1198 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1199 if (!pskb_may_pull(skb, 1))
1202 qbit = skb->data[0];
1207 * Push down the X.25 header
1209 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1211 if (msg->msg_flags & MSG_OOB) {
1212 if (x25->neighbour->extended) {
1213 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1214 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1215 *asmptr++ = (x25->lci >> 0) & 0xFF;
1216 *asmptr++ = X25_INTERRUPT;
1218 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1219 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1220 *asmptr++ = (x25->lci >> 0) & 0xFF;
1221 *asmptr++ = X25_INTERRUPT;
1224 if (x25->neighbour->extended) {
1225 /* Build an Extended X.25 header */
1226 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1227 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1228 *asmptr++ = (x25->lci >> 0) & 0xFF;
1229 *asmptr++ = X25_DATA;
1230 *asmptr++ = X25_DATA;
1232 /* Build an Standard X.25 header */
1233 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1234 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1235 *asmptr++ = (x25->lci >> 0) & 0xFF;
1236 *asmptr++ = X25_DATA;
1240 skb->data[0] |= X25_Q_BIT;
1243 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1244 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1247 if (sk->sk_state != TCP_ESTABLISHED)
1250 if (msg->msg_flags & MSG_OOB)
1251 skb_queue_tail(&x25->interrupt_out_queue, skb);
1253 rc = x25_output(sk, skb);
1257 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1272 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1275 struct sock *sk = sock->sk;
1276 struct x25_sock *x25 = x25_sk(sk);
1277 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1279 int qbit, header_len;
1280 struct sk_buff *skb;
1281 unsigned char *asmptr;
1286 if (x25->neighbour == NULL)
1289 header_len = x25->neighbour->extended ?
1290 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1293 * This works for seqpacket too. The receiver has ordered the queue for
1294 * us! We do one quick check first though
1296 if (sk->sk_state != TCP_ESTABLISHED)
1299 if (flags & MSG_OOB) {
1301 if (sock_flag(sk, SOCK_URGINLINE) ||
1302 !skb_peek(&x25->interrupt_in_queue))
1305 skb = skb_dequeue(&x25->interrupt_in_queue);
1307 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1308 goto out_free_dgram;
1310 skb_pull(skb, X25_STD_MIN_LEN);
1313 * No Q bit information on Interrupt data.
1315 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1316 asmptr = skb_push(skb, 1);
1320 msg->msg_flags |= MSG_OOB;
1322 /* Now we can treat all alike */
1324 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1325 flags & MSG_DONTWAIT, &rc);
1330 if (!pskb_may_pull(skb, header_len))
1331 goto out_free_dgram;
1333 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1335 skb_pull(skb, header_len);
1337 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1338 asmptr = skb_push(skb, 1);
1343 skb_reset_transport_header(skb);
1346 if (copied > size) {
1348 msg->msg_flags |= MSG_TRUNC;
1351 /* Currently, each datagram always contains a complete record */
1352 msg->msg_flags |= MSG_EOR;
1354 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1356 goto out_free_dgram;
1359 sx25->sx25_family = AF_X25;
1360 sx25->sx25_addr = x25->dest_addr;
1361 msg->msg_namelen = sizeof(*sx25);
1367 skb_free_datagram(sk, skb);
1374 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1376 struct sock *sk = sock->sk;
1377 struct x25_sock *x25 = x25_sk(sk);
1378 void __user *argp = (void __user *)arg;
1385 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1388 rc = put_user(amount, (unsigned int __user *)argp);
1393 struct sk_buff *skb;
1396 * These two are safe on a single CPU system as
1397 * only user tasks fiddle here
1400 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1403 rc = put_user(amount, (unsigned int __user *)argp);
1410 rc = sock_get_timestamp(sk,
1411 (struct timeval __user *)argp);
1416 rc = sock_get_timestampns(sk,
1417 (struct timespec __user *)argp);
1421 case SIOCGIFDSTADDR:
1422 case SIOCSIFDSTADDR:
1423 case SIOCGIFBRDADDR:
1424 case SIOCSIFBRDADDR:
1425 case SIOCGIFNETMASK:
1426 case SIOCSIFNETMASK:
1434 if (!capable(CAP_NET_ADMIN))
1436 rc = x25_route_ioctl(cmd, argp);
1438 case SIOCX25GSUBSCRIP:
1439 rc = x25_subscr_ioctl(cmd, argp);
1441 case SIOCX25SSUBSCRIP:
1443 if (!capable(CAP_NET_ADMIN))
1445 rc = x25_subscr_ioctl(cmd, argp);
1447 case SIOCX25GFACILITIES: {
1449 rc = copy_to_user(argp, &x25->facilities,
1450 sizeof(x25->facilities))
1456 case SIOCX25SFACILITIES: {
1457 struct x25_facilities facilities;
1459 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1463 if (sk->sk_state != TCP_LISTEN &&
1464 sk->sk_state != TCP_CLOSE)
1465 goto out_fac_release;
1466 if (facilities.pacsize_in < X25_PS16 ||
1467 facilities.pacsize_in > X25_PS4096)
1468 goto out_fac_release;
1469 if (facilities.pacsize_out < X25_PS16 ||
1470 facilities.pacsize_out > X25_PS4096)
1471 goto out_fac_release;
1472 if (facilities.winsize_in < 1 ||
1473 facilities.winsize_in > 127)
1474 goto out_fac_release;
1475 if (facilities.throughput) {
1476 int out = facilities.throughput & 0xf0;
1477 int in = facilities.throughput & 0x0f;
1479 facilities.throughput |=
1480 X25_DEFAULT_THROUGHPUT << 4;
1481 else if (out < 0x30 || out > 0xD0)
1482 goto out_fac_release;
1484 facilities.throughput |=
1485 X25_DEFAULT_THROUGHPUT;
1486 else if (in < 0x03 || in > 0x0D)
1487 goto out_fac_release;
1489 if (facilities.reverse &&
1490 (facilities.reverse & 0x81) != 0x81)
1491 goto out_fac_release;
1492 x25->facilities = facilities;
1499 case SIOCX25GDTEFACILITIES: {
1501 rc = copy_to_user(argp, &x25->dte_facilities,
1502 sizeof(x25->dte_facilities));
1509 case SIOCX25SDTEFACILITIES: {
1510 struct x25_dte_facilities dtefacs;
1512 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1516 if (sk->sk_state != TCP_LISTEN &&
1517 sk->sk_state != TCP_CLOSE)
1518 goto out_dtefac_release;
1519 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1520 goto out_dtefac_release;
1521 if (dtefacs.called_len > X25_MAX_AE_LEN)
1522 goto out_dtefac_release;
1523 x25->dte_facilities = dtefacs;
1530 case SIOCX25GCALLUSERDATA: {
1532 rc = copy_to_user(argp, &x25->calluserdata,
1533 sizeof(x25->calluserdata))
1539 case SIOCX25SCALLUSERDATA: {
1540 struct x25_calluserdata calluserdata;
1543 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1546 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1549 x25->calluserdata = calluserdata;
1555 case SIOCX25GCAUSEDIAG: {
1557 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1563 case SIOCX25SCAUSEDIAG: {
1564 struct x25_causediag causediag;
1566 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1569 x25->causediag = causediag;
1576 case SIOCX25SCUDMATCHLEN: {
1577 struct x25_subaddr sub_addr;
1580 if(sk->sk_state != TCP_CLOSE)
1581 goto out_cud_release;
1583 if (copy_from_user(&sub_addr, argp,
1585 goto out_cud_release;
1587 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1588 goto out_cud_release;
1589 x25->cudmatchlength = sub_addr.cudmatchlength;
1596 case SIOCX25CALLACCPTAPPRV: {
1599 if (sk->sk_state == TCP_CLOSE) {
1600 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1607 case SIOCX25SENDCALLACCPT: {
1610 if (sk->sk_state != TCP_ESTABLISHED)
1611 goto out_sendcallaccpt_release;
1612 /* must call accptapprv above */
1613 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1614 goto out_sendcallaccpt_release;
1615 x25_write_internal(sk, X25_CALL_ACCEPTED);
1616 x25->state = X25_STATE_3;
1618 out_sendcallaccpt_release:
1631 static const struct net_proto_family x25_family_ops = {
1633 .create = x25_create,
1634 .owner = THIS_MODULE,
1637 #ifdef CONFIG_COMPAT
1638 static int compat_x25_subscr_ioctl(unsigned int cmd,
1639 struct compat_x25_subscrip_struct __user *x25_subscr32)
1641 struct compat_x25_subscrip_struct x25_subscr;
1642 struct x25_neigh *nb;
1643 struct net_device *dev;
1647 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1651 dev = x25_dev_get(x25_subscr.device);
1655 nb = x25_get_neigh(dev);
1661 if (cmd == SIOCX25GSUBSCRIP) {
1662 read_lock_bh(&x25_neigh_list_lock);
1663 x25_subscr.extended = nb->extended;
1664 x25_subscr.global_facil_mask = nb->global_facil_mask;
1665 read_unlock_bh(&x25_neigh_list_lock);
1666 rc = copy_to_user(x25_subscr32, &x25_subscr,
1667 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1670 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1672 write_lock_bh(&x25_neigh_list_lock);
1673 nb->extended = x25_subscr.extended;
1674 nb->global_facil_mask = x25_subscr.global_facil_mask;
1675 write_unlock_bh(&x25_neigh_list_lock);
1686 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1689 void __user *argp = compat_ptr(arg);
1690 struct sock *sk = sock->sk;
1692 int rc = -ENOIOCTLCMD;
1697 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1702 rc = compat_sock_get_timestamp(sk,
1703 (struct timeval __user*)argp);
1708 rc = compat_sock_get_timestampns(sk,
1709 (struct timespec __user*)argp);
1713 case SIOCGIFDSTADDR:
1714 case SIOCSIFDSTADDR:
1715 case SIOCGIFBRDADDR:
1716 case SIOCSIFBRDADDR:
1717 case SIOCGIFNETMASK:
1718 case SIOCSIFNETMASK:
1726 if (!capable(CAP_NET_ADMIN))
1728 rc = x25_route_ioctl(cmd, argp);
1730 case SIOCX25GSUBSCRIP:
1731 rc = compat_x25_subscr_ioctl(cmd, argp);
1733 case SIOCX25SSUBSCRIP:
1735 if (!capable(CAP_NET_ADMIN))
1737 rc = compat_x25_subscr_ioctl(cmd, argp);
1739 case SIOCX25GFACILITIES:
1740 case SIOCX25SFACILITIES:
1741 case SIOCX25GDTEFACILITIES:
1742 case SIOCX25SDTEFACILITIES:
1743 case SIOCX25GCALLUSERDATA:
1744 case SIOCX25SCALLUSERDATA:
1745 case SIOCX25GCAUSEDIAG:
1746 case SIOCX25SCAUSEDIAG:
1747 case SIOCX25SCUDMATCHLEN:
1748 case SIOCX25CALLACCPTAPPRV:
1749 case SIOCX25SENDCALLACCPT:
1750 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1760 static const struct proto_ops x25_proto_ops = {
1762 .owner = THIS_MODULE,
1763 .release = x25_release,
1765 .connect = x25_connect,
1766 .socketpair = sock_no_socketpair,
1767 .accept = x25_accept,
1768 .getname = x25_getname,
1769 .poll = datagram_poll,
1771 #ifdef CONFIG_COMPAT
1772 .compat_ioctl = compat_x25_ioctl,
1774 .listen = x25_listen,
1775 .shutdown = sock_no_shutdown,
1776 .setsockopt = x25_setsockopt,
1777 .getsockopt = x25_getsockopt,
1778 .sendmsg = x25_sendmsg,
1779 .recvmsg = x25_recvmsg,
1780 .mmap = sock_no_mmap,
1781 .sendpage = sock_no_sendpage,
1784 static struct packet_type x25_packet_type __read_mostly = {
1785 .type = cpu_to_be16(ETH_P_X25),
1786 .func = x25_lapb_receive_frame,
1789 static struct notifier_block x25_dev_notifier = {
1790 .notifier_call = x25_device_event,
1793 void x25_kill_by_neigh(struct x25_neigh *nb)
1797 write_lock_bh(&x25_list_lock);
1799 sk_for_each(s, &x25_list)
1800 if (x25_sk(s)->neighbour == nb)
1801 x25_disconnect(s, ENETUNREACH, 0, 0);
1803 write_unlock_bh(&x25_list_lock);
1805 /* Remove any related forwards */
1806 x25_clear_forward_by_dev(nb->dev);
1809 static int __init x25_init(void)
1813 rc = proto_register(&x25_proto, 0);
1817 rc = sock_register(&x25_family_ops);
1821 dev_add_pack(&x25_packet_type);
1823 rc = register_netdevice_notifier(&x25_dev_notifier);
1827 rc = x25_register_sysctl();
1831 rc = x25_proc_init();
1835 pr_info("Linux Version 0.2\n");
1840 x25_unregister_sysctl();
1842 unregister_netdevice_notifier(&x25_dev_notifier);
1844 dev_remove_pack(&x25_packet_type);
1845 sock_unregister(AF_X25);
1847 proto_unregister(&x25_proto);
1850 module_init(x25_init);
1852 static void __exit x25_exit(void)
1858 x25_unregister_sysctl();
1860 unregister_netdevice_notifier(&x25_dev_notifier);
1862 dev_remove_pack(&x25_packet_type);
1864 sock_unregister(AF_X25);
1865 proto_unregister(&x25_proto);
1867 module_exit(x25_exit);
1869 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1870 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1871 MODULE_LICENSE("GPL");
1872 MODULE_ALIAS_NETPROTO(PF_X25);