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 #include <linux/module.h>
39 #include <linux/capability.h>
40 #include <linux/errno.h>
41 #include <linux/kernel.h>
42 #include <linux/sched.h>
43 #include <linux/smp_lock.h>
44 #include <linux/timer.h>
45 #include <linux/string.h>
46 #include <linux/net.h>
47 #include <linux/netdevice.h>
48 #include <linux/if_arp.h>
49 #include <linux/skbuff.h>
50 #include <linux/slab.h>
52 #include <net/tcp_states.h>
53 #include <asm/uaccess.h>
54 #include <linux/fcntl.h>
55 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
56 #include <linux/notifier.h>
57 #include <linux/init.h>
58 #include <linux/compat.h>
59 #include <linux/ctype.h>
62 #include <net/compat.h>
64 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
65 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
66 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
67 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
68 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
69 int sysctl_x25_forward = 0;
72 DEFINE_RWLOCK(x25_list_lock);
74 static const struct proto_ops x25_proto_ops;
76 static struct x25_address null_x25_address = {" "};
79 struct compat_x25_subscrip_struct {
80 char device[200-sizeof(compat_ulong_t)];
81 compat_ulong_t global_facil_mask;
82 compat_uint_t extended;
87 int x25_parse_address_block(struct sk_buff *skb,
88 struct x25_address *called_addr,
89 struct x25_address *calling_addr)
96 /* packet has no address block */
102 needed = 1 + (len >> 4) + (len & 0x0f);
104 if (skb->len < needed) {
105 /* packet is too short to hold the addresses it claims
111 return x25_addr_ntoa(skb->data, called_addr, calling_addr);
114 *called_addr->x25_addr = 0;
115 *calling_addr->x25_addr = 0;
121 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
122 struct x25_address *calling_addr)
124 unsigned int called_len, calling_len;
125 char *called, *calling;
128 called_len = (*p >> 0) & 0x0F;
129 calling_len = (*p >> 4) & 0x0F;
131 called = called_addr->x25_addr;
132 calling = calling_addr->x25_addr;
135 for (i = 0; i < (called_len + calling_len); i++) {
136 if (i < called_len) {
138 *called++ = ((*p >> 0) & 0x0F) + '0';
141 *called++ = ((*p >> 4) & 0x0F) + '0';
145 *calling++ = ((*p >> 0) & 0x0F) + '0';
148 *calling++ = ((*p >> 4) & 0x0F) + '0';
153 *called = *calling = '\0';
155 return 1 + (called_len + calling_len + 1) / 2;
158 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
159 struct x25_address *calling_addr)
161 unsigned int called_len, calling_len;
162 char *called, *calling;
165 called = called_addr->x25_addr;
166 calling = calling_addr->x25_addr;
168 called_len = strlen(called);
169 calling_len = strlen(calling);
171 *p++ = (calling_len << 4) | (called_len << 0);
173 for (i = 0; i < (called_len + calling_len); i++) {
174 if (i < called_len) {
176 *p |= (*called++ - '0') << 0;
180 *p |= (*called++ - '0') << 4;
184 *p |= (*calling++ - '0') << 0;
188 *p |= (*calling++ - '0') << 4;
193 return 1 + (called_len + calling_len + 1) / 2;
197 * Socket removal during an interrupt is now safe.
199 static void x25_remove_socket(struct sock *sk)
201 write_lock_bh(&x25_list_lock);
202 sk_del_node_init(sk);
203 write_unlock_bh(&x25_list_lock);
207 * Kill all bound sockets on a dropped device.
209 static void x25_kill_by_device(struct net_device *dev)
212 struct hlist_node *node;
214 write_lock_bh(&x25_list_lock);
216 sk_for_each(s, node, &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 = ptr;
230 struct x25_neigh *nb;
232 if (!net_eq(dev_net(dev), &init_net))
235 if (dev->type == ARPHRD_X25
236 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
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;
284 struct hlist_node *node;
286 read_lock_bh(&x25_list_lock);
289 sk_for_each(s, node, &x25_list)
290 if ((!strcmp(addr->x25_addr,
291 x25_sk(s)->source_addr.x25_addr) ||
292 !strcmp(addr->x25_addr,
293 null_x25_address.x25_addr)) &&
294 s->sk_state == TCP_LISTEN) {
296 * Found a listening socket, now check the incoming
297 * call user data vs this sockets call user data
299 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
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)
326 struct hlist_node *node;
328 sk_for_each(s, node, &x25_list)
329 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
338 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
342 read_lock_bh(&x25_list_lock);
343 s = __x25_find_socket(lci, nb);
344 read_unlock_bh(&x25_list_lock);
349 * Find a unique LCI for a given device.
351 static unsigned int x25_new_lci(struct x25_neigh *nb)
353 unsigned int lci = 1;
356 read_lock_bh(&x25_list_lock);
358 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
366 read_unlock_bh(&x25_list_lock);
373 static void __x25_destroy_socket(struct sock *);
376 * handler for deferred kills.
378 static void x25_destroy_timer(unsigned long data)
380 x25_destroy_socket_from_timer((struct sock *)data);
384 * This is called from user mode and the timers. Thus it protects itself
385 * against interrupt users but doesn't worry about being called during
386 * work. Once it is removed from the queue no interrupt or bottom half
387 * will touch it and we are (fairly 8-) ) safe.
388 * Not static as it's used by the timer
390 static void __x25_destroy_socket(struct sock *sk)
394 x25_stop_heartbeat(sk);
397 x25_remove_socket(sk);
398 x25_clear_queues(sk); /* Flush the queues */
400 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
401 if (skb->sk != sk) { /* A pending connection */
403 * Queue the unaccepted socket for death
405 skb->sk->sk_state = TCP_LISTEN;
406 sock_set_flag(skb->sk, SOCK_DEAD);
407 x25_start_heartbeat(skb->sk);
408 x25_sk(skb->sk)->state = X25_STATE_0;
414 if (sk_has_allocations(sk)) {
415 /* Defer: outstanding buffers */
416 sk->sk_timer.expires = jiffies + 10 * HZ;
417 sk->sk_timer.function = x25_destroy_timer;
418 sk->sk_timer.data = (unsigned long)sk;
419 add_timer(&sk->sk_timer);
421 /* drop last reference so sock_put will free */
426 void x25_destroy_socket_from_timer(struct sock *sk)
430 __x25_destroy_socket(sk);
435 static void x25_destroy_socket(struct sock *sk)
439 __x25_destroy_socket(sk);
445 * Handling for system calls applied via the various interfaces to a
446 * X.25 socket object.
449 static int x25_setsockopt(struct socket *sock, int level, int optname,
450 char __user *optval, unsigned int optlen)
453 struct sock *sk = sock->sk;
454 int rc = -ENOPROTOOPT;
456 if (level != SOL_X25 || optname != X25_QBITINCL)
460 if (optlen < sizeof(int))
464 if (get_user(opt, (int __user *)optval))
468 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
470 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
476 static int x25_getsockopt(struct socket *sock, int level, int optname,
477 char __user *optval, int __user *optlen)
479 struct sock *sk = sock->sk;
480 int val, len, rc = -ENOPROTOOPT;
482 if (level != SOL_X25 || optname != X25_QBITINCL)
486 if (get_user(len, optlen))
489 len = min_t(unsigned int, len, sizeof(int));
496 if (put_user(len, optlen))
499 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
500 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
505 static int x25_listen(struct socket *sock, int backlog)
507 struct sock *sk = sock->sk;
508 int rc = -EOPNOTSUPP;
511 if (sk->sk_state != TCP_LISTEN) {
512 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
513 sk->sk_max_ack_backlog = backlog;
514 sk->sk_state = TCP_LISTEN;
522 static struct proto x25_proto = {
524 .owner = THIS_MODULE,
525 .obj_size = sizeof(struct x25_sock),
528 static struct sock *x25_alloc_socket(struct net *net)
530 struct x25_sock *x25;
531 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
536 sock_init_data(NULL, sk);
539 skb_queue_head_init(&x25->ack_queue);
540 skb_queue_head_init(&x25->fragment_queue);
541 skb_queue_head_init(&x25->interrupt_in_queue);
542 skb_queue_head_init(&x25->interrupt_out_queue);
547 static int x25_create(struct net *net, struct socket *sock, int protocol,
551 struct x25_sock *x25;
552 int rc = -EAFNOSUPPORT;
554 if (!net_eq(net, &init_net))
557 rc = -ESOCKTNOSUPPORT;
558 if (sock->type != SOCK_SEQPACKET)
566 if ((sk = x25_alloc_socket(net)) == NULL)
571 sock_init_data(sock, sk);
575 sock->ops = &x25_proto_ops;
576 sk->sk_protocol = protocol;
577 sk->sk_backlog_rcv = x25_backlog_rcv;
579 x25->t21 = sysctl_x25_call_request_timeout;
580 x25->t22 = sysctl_x25_reset_request_timeout;
581 x25->t23 = sysctl_x25_clear_request_timeout;
582 x25->t2 = sysctl_x25_ack_holdback_timeout;
583 x25->state = X25_STATE_0;
584 x25->cudmatchlength = 0;
585 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */
588 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
589 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
590 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
591 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
592 x25->facilities.throughput = 0; /* by default don't negotiate
594 x25->facilities.reverse = X25_DEFAULT_REVERSE;
595 x25->dte_facilities.calling_len = 0;
596 x25->dte_facilities.called_len = 0;
597 memset(x25->dte_facilities.called_ae, '\0',
598 sizeof(x25->dte_facilities.called_ae));
599 memset(x25->dte_facilities.calling_ae, '\0',
600 sizeof(x25->dte_facilities.calling_ae));
607 static struct sock *x25_make_new(struct sock *osk)
609 struct sock *sk = NULL;
610 struct x25_sock *x25, *ox25;
612 if (osk->sk_type != SOCK_SEQPACKET)
615 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
620 sk->sk_type = osk->sk_type;
621 sk->sk_priority = osk->sk_priority;
622 sk->sk_protocol = osk->sk_protocol;
623 sk->sk_rcvbuf = osk->sk_rcvbuf;
624 sk->sk_sndbuf = osk->sk_sndbuf;
625 sk->sk_state = TCP_ESTABLISHED;
626 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
627 sock_copy_flags(sk, osk);
630 x25->t21 = ox25->t21;
631 x25->t22 = ox25->t22;
632 x25->t23 = ox25->t23;
634 x25->flags = ox25->flags;
635 x25->facilities = ox25->facilities;
636 x25->dte_facilities = ox25->dte_facilities;
637 x25->cudmatchlength = ox25->cudmatchlength;
639 clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
645 static int x25_release(struct socket *sock)
647 struct sock *sk = sock->sk;
648 struct x25_sock *x25;
656 switch (x25->state) {
660 x25_disconnect(sk, 0, 0, 0);
661 x25_destroy_socket(sk);
667 x25_clear_queues(sk);
668 x25_write_internal(sk, X25_CLEAR_REQUEST);
669 x25_start_t23timer(sk);
670 x25->state = X25_STATE_2;
671 sk->sk_state = TCP_CLOSE;
672 sk->sk_shutdown |= SEND_SHUTDOWN;
673 sk->sk_state_change(sk);
674 sock_set_flag(sk, SOCK_DEAD);
675 sock_set_flag(sk, SOCK_DESTROY);
685 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
687 struct sock *sk = sock->sk;
688 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
691 if (!sock_flag(sk, SOCK_ZAPPED) ||
692 addr_len != sizeof(struct sockaddr_x25) ||
693 addr->sx25_family != AF_X25) {
698 len = strlen(addr->sx25_addr.x25_addr);
699 for (i = 0; i < len; i++) {
700 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
707 x25_sk(sk)->source_addr = addr->sx25_addr;
708 x25_insert_socket(sk);
709 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;
756 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
757 sock->state = SS_CONNECTED;
758 goto out; /* Connect completed during a ERESTARTSYS event */
762 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
763 sock->state = SS_UNCONNECTED;
767 rc = -EISCONN; /* No reconnect on a seqpacket socket */
768 if (sk->sk_state == TCP_ESTABLISHED)
771 sk->sk_state = TCP_CLOSE;
772 sock->state = SS_UNCONNECTED;
775 if (addr_len != sizeof(struct sockaddr_x25) ||
776 addr->sx25_family != AF_X25)
780 rt = x25_get_route(&addr->sx25_addr);
784 x25->neighbour = x25_get_neigh(rt->dev);
788 x25_limit_facilities(&x25->facilities, x25->neighbour);
790 x25->lci = x25_new_lci(x25->neighbour);
795 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
798 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
799 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
801 x25->dest_addr = addr->sx25_addr;
803 /* Move to connecting socket, start sending Connect Requests */
804 sock->state = SS_CONNECTING;
805 sk->sk_state = TCP_SYN_SENT;
807 x25->state = X25_STATE_1;
809 x25_write_internal(sk, X25_CALL_REQUEST);
811 x25_start_heartbeat(sk);
812 x25_start_t21timer(sk);
816 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
819 rc = x25_wait_for_connection_establishment(sk);
823 sock->state = SS_CONNECTED;
827 x25_neigh_put(x25->neighbour);
836 static int x25_wait_for_data(struct sock *sk, long timeout)
838 DECLARE_WAITQUEUE(wait, current);
841 add_wait_queue_exclusive(sk_sleep(sk), &wait);
843 __set_current_state(TASK_INTERRUPTIBLE);
844 if (sk->sk_shutdown & RCV_SHUTDOWN)
847 if (signal_pending(current))
853 if (skb_queue_empty(&sk->sk_receive_queue)) {
855 timeout = schedule_timeout(timeout);
860 __set_current_state(TASK_RUNNING);
861 remove_wait_queue(sk_sleep(sk), &wait);
865 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
867 struct sock *sk = sock->sk;
876 if (sk->sk_type != SOCK_SEQPACKET)
881 if (sk->sk_state != TCP_LISTEN)
884 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
887 skb = skb_dequeue(&sk->sk_receive_queue);
892 sock_graft(newsk, newsock);
894 /* Now attach up the new socket */
897 sk->sk_ack_backlog--;
898 newsock->state = SS_CONNECTED;
906 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
907 int *uaddr_len, int peer)
909 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
910 struct sock *sk = sock->sk;
911 struct x25_sock *x25 = x25_sk(sk);
916 if (sk->sk_state != TCP_ESTABLISHED) {
920 sx25->sx25_addr = x25->dest_addr;
922 sx25->sx25_addr = x25->source_addr;
924 sx25->sx25_family = AF_X25;
925 *uaddr_len = sizeof(*sx25);
932 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
938 rc = datagram_poll(file, sock, wait);
944 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
949 struct x25_sock *makex25;
950 struct x25_address source_addr, dest_addr;
951 struct x25_facilities facilities;
952 struct x25_dte_facilities dte_facilities;
953 int len, addr_len, rc;
956 * Remove the LCI and frame type.
958 skb_pull(skb, X25_STD_MIN_LEN);
961 * Extract the X.25 addresses and convert them to ASCII strings,
964 * Address block is mandatory in call request packets
966 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
968 goto out_clear_request;
969 skb_pull(skb, addr_len);
972 * Get the length of the facilities, skip past them for the moment
973 * get the call user data because this is needed to determine
974 * the correct listener
976 * Facilities length is mandatory in call request packets
979 goto out_clear_request;
980 len = skb->data[0] + 1;
982 goto out_clear_request;
986 * Find a listener for the particular address/cud pair.
988 sk = x25_find_listener(&source_addr,skb);
991 if (sk != NULL && sk_acceptq_is_full(sk)) {
996 * We dont have any listeners for this incoming call.
1000 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1001 if (sysctl_x25_forward &&
1002 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1004 /* Call was forwarded, dont process it any more */
1009 /* No listeners, can't forward, clear the call */
1010 goto out_clear_request;
1015 * Try to reach a compromise on the requested facilities.
1017 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1022 * current neighbour/link might impose additional limits
1023 * on certain facilties
1026 x25_limit_facilities(&facilities, nb);
1029 * Try to create a new socket.
1031 make = x25_make_new(sk);
1036 * Remove the facilities
1041 make->sk_state = TCP_ESTABLISHED;
1043 makex25 = x25_sk(make);
1045 makex25->dest_addr = dest_addr;
1046 makex25->source_addr = source_addr;
1047 makex25->neighbour = nb;
1048 makex25->facilities = facilities;
1049 makex25->dte_facilities= dte_facilities;
1050 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1051 /* ensure no reverse facil on accept */
1052 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1053 /* ensure no calling address extension on accept */
1054 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1055 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1057 /* Normally all calls are accepted immediately */
1058 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1059 x25_write_internal(make, X25_CALL_ACCEPTED);
1060 makex25->state = X25_STATE_3;
1064 * Incoming Call User Data.
1066 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1067 makex25->calluserdata.cudlength = skb->len;
1069 sk->sk_ack_backlog++;
1071 x25_insert_socket(make);
1073 skb_queue_head(&sk->sk_receive_queue, skb);
1075 x25_start_heartbeat(make);
1077 if (!sock_flag(sk, SOCK_DEAD))
1078 sk->sk_data_ready(sk, skb->len);
1087 x25_transmit_clear_request(nb, lci, 0x01);
1091 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1092 struct msghdr *msg, size_t len)
1094 struct sock *sk = sock->sk;
1095 struct x25_sock *x25 = x25_sk(sk);
1096 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1097 struct sockaddr_x25 sx25;
1098 struct sk_buff *skb;
1099 unsigned char *asmptr;
1100 int noblock = msg->msg_flags & MSG_DONTWAIT;
1102 int qbit = 0, rc = -EINVAL;
1105 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1108 /* we currently don't support segmented records at the user interface */
1109 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1112 rc = -EADDRNOTAVAIL;
1113 if (sock_flag(sk, SOCK_ZAPPED))
1117 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1118 send_sig(SIGPIPE, current, 0);
1123 if (!x25->neighbour)
1128 if (msg->msg_namelen < sizeof(sx25))
1130 memcpy(&sx25, usx25, sizeof(sx25));
1132 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1135 if (sx25.sx25_family != AF_X25)
1139 * FIXME 1003.1g - if the socket is like this because
1140 * it has become closed (not started closed) we ought
1141 * to SIGPIPE, EPIPE;
1144 if (sk->sk_state != TCP_ESTABLISHED)
1147 sx25.sx25_family = AF_X25;
1148 sx25.sx25_addr = x25->dest_addr;
1151 /* Sanity check the packet size */
1157 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1159 /* Build a packet */
1160 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1162 if ((msg->msg_flags & MSG_OOB) && len > 32)
1165 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1167 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1170 X25_SKB_CB(skb)->flags = msg->msg_flags;
1172 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1175 * Put the data on the end
1177 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1179 skb_reset_transport_header(skb);
1182 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1187 * If the Q BIT Include socket option is in force, the first
1188 * byte of the user data is the logical value of the Q Bit.
1190 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1191 qbit = skb->data[0];
1196 * Push down the X.25 header
1198 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1200 if (msg->msg_flags & MSG_OOB) {
1201 if (x25->neighbour->extended) {
1202 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1203 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1204 *asmptr++ = (x25->lci >> 0) & 0xFF;
1205 *asmptr++ = X25_INTERRUPT;
1207 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1208 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1209 *asmptr++ = (x25->lci >> 0) & 0xFF;
1210 *asmptr++ = X25_INTERRUPT;
1213 if (x25->neighbour->extended) {
1214 /* Build an Extended X.25 header */
1215 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1216 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1217 *asmptr++ = (x25->lci >> 0) & 0xFF;
1218 *asmptr++ = X25_DATA;
1219 *asmptr++ = X25_DATA;
1221 /* Build an Standard X.25 header */
1222 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1223 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1224 *asmptr++ = (x25->lci >> 0) & 0xFF;
1225 *asmptr++ = X25_DATA;
1229 skb->data[0] |= X25_Q_BIT;
1232 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1233 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1236 if (sk->sk_state != TCP_ESTABLISHED)
1239 if (msg->msg_flags & MSG_OOB)
1240 skb_queue_tail(&x25->interrupt_out_queue, skb);
1242 rc = x25_output(sk, skb);
1246 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1251 * lock_sock() is currently only used to serialize this x25_kick()
1252 * against input-driven x25_kick() calls. It currently only blocks
1253 * incoming packets for this socket and does not protect against
1254 * any other socket state changes and is not called from anywhere
1255 * else. As x25_kick() cannot block and as long as all socket
1256 * operations are BKL-wrapped, we don't need take to care about
1257 * purging the backlog queue in x25_release().
1259 * Using lock_sock() to protect all socket operations entirely
1260 * (and making the whole x25 stack SMP aware) unfortunately would
1261 * require major changes to {send,recv}msg and skb allocation methods.
1277 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1278 struct msghdr *msg, size_t size,
1281 struct sock *sk = sock->sk;
1282 struct x25_sock *x25 = x25_sk(sk);
1283 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1286 struct sk_buff *skb;
1287 unsigned char *asmptr;
1292 * This works for seqpacket too. The receiver has ordered the queue for
1293 * us! We do one quick check first though
1295 if (sk->sk_state != TCP_ESTABLISHED)
1298 if (flags & MSG_OOB) {
1300 if (sock_flag(sk, SOCK_URGINLINE) ||
1301 !skb_peek(&x25->interrupt_in_queue))
1304 skb = skb_dequeue(&x25->interrupt_in_queue);
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 */
1319 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1320 flags & MSG_DONTWAIT, &rc);
1324 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1326 skb_pull(skb, x25->neighbour->extended ?
1327 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1329 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1330 asmptr = skb_push(skb, 1);
1335 skb_reset_transport_header(skb);
1338 if (copied > size) {
1340 msg->msg_flags |= MSG_TRUNC;
1343 /* Currently, each datagram always contains a complete record */
1344 msg->msg_flags |= MSG_EOR;
1346 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1348 goto out_free_dgram;
1351 sx25->sx25_family = AF_X25;
1352 sx25->sx25_addr = x25->dest_addr;
1355 msg->msg_namelen = sizeof(struct sockaddr_x25);
1362 skb_free_datagram(sk, skb);
1369 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1371 struct sock *sk = sock->sk;
1372 struct x25_sock *x25 = x25_sk(sk);
1373 void __user *argp = (void __user *)arg;
1379 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1383 rc = put_user(amount, (unsigned int __user *)argp);
1388 struct sk_buff *skb;
1391 * These two are safe on a single CPU system as
1392 * only user tasks fiddle here
1394 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1396 rc = put_user(amount, (unsigned int __user *)argp);
1403 rc = sock_get_timestamp(sk,
1404 (struct timeval __user *)argp);
1409 rc = sock_get_timestampns(sk,
1410 (struct timespec __user *)argp);
1414 case SIOCGIFDSTADDR:
1415 case SIOCSIFDSTADDR:
1416 case SIOCGIFBRDADDR:
1417 case SIOCSIFBRDADDR:
1418 case SIOCGIFNETMASK:
1419 case SIOCSIFNETMASK:
1427 if (!capable(CAP_NET_ADMIN))
1429 rc = x25_route_ioctl(cmd, argp);
1431 case SIOCX25GSUBSCRIP:
1432 rc = x25_subscr_ioctl(cmd, argp);
1434 case SIOCX25SSUBSCRIP:
1436 if (!capable(CAP_NET_ADMIN))
1438 rc = x25_subscr_ioctl(cmd, argp);
1440 case SIOCX25GFACILITIES: {
1441 struct x25_facilities fac = x25->facilities;
1442 rc = copy_to_user(argp, &fac,
1443 sizeof(fac)) ? -EFAULT : 0;
1447 case SIOCX25SFACILITIES: {
1448 struct x25_facilities facilities;
1450 if (copy_from_user(&facilities, argp,
1451 sizeof(facilities)))
1454 if (sk->sk_state != TCP_LISTEN &&
1455 sk->sk_state != TCP_CLOSE)
1457 if (facilities.pacsize_in < X25_PS16 ||
1458 facilities.pacsize_in > X25_PS4096)
1460 if (facilities.pacsize_out < X25_PS16 ||
1461 facilities.pacsize_out > X25_PS4096)
1463 if (facilities.winsize_in < 1 ||
1464 facilities.winsize_in > 127)
1466 if (facilities.throughput) {
1467 int out = facilities.throughput & 0xf0;
1468 int in = facilities.throughput & 0x0f;
1470 facilities.throughput |=
1471 X25_DEFAULT_THROUGHPUT << 4;
1472 else if (out < 0x30 || out > 0xD0)
1475 facilities.throughput |=
1476 X25_DEFAULT_THROUGHPUT;
1477 else if (in < 0x03 || in > 0x0D)
1480 if (facilities.reverse &&
1481 (facilities.reverse & 0x81) != 0x81)
1483 x25->facilities = facilities;
1488 case SIOCX25GDTEFACILITIES: {
1489 rc = copy_to_user(argp, &x25->dte_facilities,
1490 sizeof(x25->dte_facilities));
1496 case SIOCX25SDTEFACILITIES: {
1497 struct x25_dte_facilities dtefacs;
1499 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1502 if (sk->sk_state != TCP_LISTEN &&
1503 sk->sk_state != TCP_CLOSE)
1505 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1507 if (dtefacs.calling_ae == NULL)
1509 if (dtefacs.called_len > X25_MAX_AE_LEN)
1511 if (dtefacs.called_ae == NULL)
1513 x25->dte_facilities = dtefacs;
1518 case SIOCX25GCALLUSERDATA: {
1519 struct x25_calluserdata cud = x25->calluserdata;
1520 rc = copy_to_user(argp, &cud,
1521 sizeof(cud)) ? -EFAULT : 0;
1525 case SIOCX25SCALLUSERDATA: {
1526 struct x25_calluserdata calluserdata;
1529 if (copy_from_user(&calluserdata, argp,
1530 sizeof(calluserdata)))
1533 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1535 x25->calluserdata = calluserdata;
1540 case SIOCX25GCAUSEDIAG: {
1541 struct x25_causediag causediag;
1542 causediag = x25->causediag;
1543 rc = copy_to_user(argp, &causediag,
1544 sizeof(causediag)) ? -EFAULT : 0;
1548 case SIOCX25SCAUSEDIAG: {
1549 struct x25_causediag causediag;
1551 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1553 x25->causediag = causediag;
1559 case SIOCX25SCUDMATCHLEN: {
1560 struct x25_subaddr sub_addr;
1562 if(sk->sk_state != TCP_CLOSE)
1565 if (copy_from_user(&sub_addr, argp,
1569 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1571 x25->cudmatchlength = sub_addr.cudmatchlength;
1576 case SIOCX25CALLACCPTAPPRV: {
1578 if (sk->sk_state != TCP_CLOSE)
1580 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1585 case SIOCX25SENDCALLACCPT: {
1587 if (sk->sk_state != TCP_ESTABLISHED)
1589 /* must call accptapprv above */
1590 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1592 x25_write_internal(sk, X25_CALL_ACCEPTED);
1593 x25->state = X25_STATE_3;
1607 static const struct net_proto_family x25_family_ops = {
1609 .create = x25_create,
1610 .owner = THIS_MODULE,
1613 #ifdef CONFIG_COMPAT
1614 static int compat_x25_subscr_ioctl(unsigned int cmd,
1615 struct compat_x25_subscrip_struct __user *x25_subscr32)
1617 struct compat_x25_subscrip_struct x25_subscr;
1618 struct x25_neigh *nb;
1619 struct net_device *dev;
1623 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1627 dev = x25_dev_get(x25_subscr.device);
1631 nb = x25_get_neigh(dev);
1637 if (cmd == SIOCX25GSUBSCRIP) {
1638 x25_subscr.extended = nb->extended;
1639 x25_subscr.global_facil_mask = nb->global_facil_mask;
1640 rc = copy_to_user(x25_subscr32, &x25_subscr,
1641 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1644 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1646 nb->extended = x25_subscr.extended;
1647 nb->global_facil_mask = x25_subscr.global_facil_mask;
1658 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1661 void __user *argp = compat_ptr(arg);
1662 struct sock *sk = sock->sk;
1664 int rc = -ENOIOCTLCMD;
1669 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1675 rc = compat_sock_get_timestamp(sk,
1676 (struct timeval __user*)argp);
1683 rc = compat_sock_get_timestampns(sk,
1684 (struct timespec __user*)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))
1705 rc = x25_route_ioctl(cmd, argp);
1708 case SIOCX25GSUBSCRIP:
1710 rc = compat_x25_subscr_ioctl(cmd, argp);
1713 case SIOCX25SSUBSCRIP:
1715 if (!capable(CAP_NET_ADMIN))
1718 rc = compat_x25_subscr_ioctl(cmd, argp);
1721 case SIOCX25GFACILITIES:
1722 case SIOCX25SFACILITIES:
1723 case SIOCX25GDTEFACILITIES:
1724 case SIOCX25SDTEFACILITIES:
1725 case SIOCX25GCALLUSERDATA:
1726 case SIOCX25SCALLUSERDATA:
1727 case SIOCX25GCAUSEDIAG:
1728 case SIOCX25SCAUSEDIAG:
1729 case SIOCX25SCUDMATCHLEN:
1730 case SIOCX25CALLACCPTAPPRV:
1731 case SIOCX25SENDCALLACCPT:
1732 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1742 static const struct proto_ops x25_proto_ops = {
1744 .owner = THIS_MODULE,
1745 .release = x25_release,
1747 .connect = x25_connect,
1748 .socketpair = sock_no_socketpair,
1749 .accept = x25_accept,
1750 .getname = x25_getname,
1751 .poll = x25_datagram_poll,
1753 #ifdef CONFIG_COMPAT
1754 .compat_ioctl = compat_x25_ioctl,
1756 .listen = x25_listen,
1757 .shutdown = sock_no_shutdown,
1758 .setsockopt = x25_setsockopt,
1759 .getsockopt = x25_getsockopt,
1760 .sendmsg = x25_sendmsg,
1761 .recvmsg = x25_recvmsg,
1762 .mmap = sock_no_mmap,
1763 .sendpage = sock_no_sendpage,
1766 static struct packet_type x25_packet_type __read_mostly = {
1767 .type = cpu_to_be16(ETH_P_X25),
1768 .func = x25_lapb_receive_frame,
1771 static struct notifier_block x25_dev_notifier = {
1772 .notifier_call = x25_device_event,
1775 void x25_kill_by_neigh(struct x25_neigh *nb)
1778 struct hlist_node *node;
1780 write_lock_bh(&x25_list_lock);
1782 sk_for_each(s, node, &x25_list)
1783 if (x25_sk(s)->neighbour == nb)
1784 x25_disconnect(s, ENETUNREACH, 0, 0);
1786 write_unlock_bh(&x25_list_lock);
1788 /* Remove any related forwards */
1789 x25_clear_forward_by_dev(nb->dev);
1792 static int __init x25_init(void)
1794 int 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 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1811 x25_register_sysctl();
1812 rc = x25_proc_init();
1818 unregister_netdevice_notifier(&x25_dev_notifier);
1820 sock_unregister(AF_X25);
1822 proto_unregister(&x25_proto);
1825 module_init(x25_init);
1827 static void __exit x25_exit(void)
1833 x25_unregister_sysctl();
1835 unregister_netdevice_notifier(&x25_dev_notifier);
1837 dev_remove_pack(&x25_packet_type);
1839 sock_unregister(AF_X25);
1840 proto_unregister(&x25_proto);
1842 module_exit(x25_exit);
1844 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1845 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1846 MODULE_LICENSE("GPL");
1847 MODULE_ALIAS_NETPROTO(PF_X25);