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>
51 #include <net/tcp_states.h>
52 #include <asm/uaccess.h>
53 #include <linux/fcntl.h>
54 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
55 #include <linux/notifier.h>
56 #include <linux/init.h>
57 #include <linux/compat.h>
60 #include <net/compat.h>
62 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
63 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21;
64 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22;
65 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23;
66 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2;
67 int sysctl_x25_forward = 0;
70 DEFINE_RWLOCK(x25_list_lock);
72 static const struct proto_ops x25_proto_ops;
74 static struct x25_address null_x25_address = {" "};
77 struct compat_x25_subscrip_struct {
78 char device[200-sizeof(compat_ulong_t)];
79 compat_ulong_t global_facil_mask;
80 compat_uint_t extended;
84 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
85 struct x25_address *calling_addr)
87 unsigned int called_len, calling_len;
88 char *called, *calling;
91 called_len = (*p >> 0) & 0x0F;
92 calling_len = (*p >> 4) & 0x0F;
94 called = called_addr->x25_addr;
95 calling = calling_addr->x25_addr;
98 for (i = 0; i < (called_len + calling_len); i++) {
101 *called++ = ((*p >> 0) & 0x0F) + '0';
104 *called++ = ((*p >> 4) & 0x0F) + '0';
108 *calling++ = ((*p >> 0) & 0x0F) + '0';
111 *calling++ = ((*p >> 4) & 0x0F) + '0';
116 *called = *calling = '\0';
118 return 1 + (called_len + calling_len + 1) / 2;
121 int x25_addr_aton(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 = called_addr->x25_addr;
129 calling = calling_addr->x25_addr;
131 called_len = strlen(called);
132 calling_len = strlen(calling);
134 *p++ = (calling_len << 4) | (called_len << 0);
136 for (i = 0; i < (called_len + calling_len); i++) {
137 if (i < called_len) {
139 *p |= (*called++ - '0') << 0;
143 *p |= (*called++ - '0') << 4;
147 *p |= (*calling++ - '0') << 0;
151 *p |= (*calling++ - '0') << 4;
156 return 1 + (called_len + calling_len + 1) / 2;
160 * Socket removal during an interrupt is now safe.
162 static void x25_remove_socket(struct sock *sk)
164 write_lock_bh(&x25_list_lock);
165 sk_del_node_init(sk);
166 write_unlock_bh(&x25_list_lock);
170 * Kill all bound sockets on a dropped device.
172 static void x25_kill_by_device(struct net_device *dev)
175 struct hlist_node *node;
177 write_lock_bh(&x25_list_lock);
179 sk_for_each(s, node, &x25_list)
180 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
181 x25_disconnect(s, ENETUNREACH, 0, 0);
183 write_unlock_bh(&x25_list_lock);
187 * Handle device status changes.
189 static int x25_device_event(struct notifier_block *this, unsigned long event,
192 struct net_device *dev = ptr;
193 struct x25_neigh *nb;
195 if (!net_eq(dev_net(dev), &init_net))
198 if (dev->type == ARPHRD_X25
199 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
200 || dev->type == ARPHRD_ETHER
205 x25_link_device_up(dev);
207 case NETDEV_GOING_DOWN:
208 nb = x25_get_neigh(dev);
210 x25_terminate_link(nb);
215 x25_kill_by_device(dev);
216 x25_route_device_down(dev);
217 x25_link_device_down(dev);
226 * Add a socket to the bound sockets list.
228 static void x25_insert_socket(struct sock *sk)
230 write_lock_bh(&x25_list_lock);
231 sk_add_node(sk, &x25_list);
232 write_unlock_bh(&x25_list_lock);
236 * Find a socket that wants to accept the Call Request we just
237 * received. Check the full list for an address/cud match.
238 * If no cuds match return the next_best thing, an address match.
239 * Note: if a listening socket has cud set it must only get calls
242 static struct sock *x25_find_listener(struct x25_address *addr,
246 struct sock *next_best;
247 struct hlist_node *node;
249 read_lock_bh(&x25_list_lock);
252 sk_for_each(s, node, &x25_list)
253 if ((!strcmp(addr->x25_addr,
254 x25_sk(s)->source_addr.x25_addr) ||
255 !strcmp(addr->x25_addr,
256 null_x25_address.x25_addr)) &&
257 s->sk_state == TCP_LISTEN) {
259 * Found a listening socket, now check the incoming
260 * call user data vs this sockets call user data
262 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
263 if((memcmp(x25_sk(s)->calluserdata.cuddata,
265 x25_sk(s)->cudmatchlength)) == 0) {
279 read_unlock_bh(&x25_list_lock);
284 * Find a connected X.25 socket given my LCI and neighbour.
286 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
289 struct hlist_node *node;
291 sk_for_each(s, node, &x25_list)
292 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
301 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
305 read_lock_bh(&x25_list_lock);
306 s = __x25_find_socket(lci, nb);
307 read_unlock_bh(&x25_list_lock);
312 * Find a unique LCI for a given device.
314 static unsigned int x25_new_lci(struct x25_neigh *nb)
316 unsigned int lci = 1;
319 read_lock_bh(&x25_list_lock);
321 while ((sk = __x25_find_socket(lci, nb)) != NULL) {
329 read_unlock_bh(&x25_list_lock);
336 static void __x25_destroy_socket(struct sock *);
339 * handler for deferred kills.
341 static void x25_destroy_timer(unsigned long data)
343 x25_destroy_socket_from_timer((struct sock *)data);
347 * This is called from user mode and the timers. Thus it protects itself
348 * against interrupt users but doesn't worry about being called during
349 * work. Once it is removed from the queue no interrupt or bottom half
350 * will touch it and we are (fairly 8-) ) safe.
351 * Not static as it's used by the timer
353 static void __x25_destroy_socket(struct sock *sk)
357 x25_stop_heartbeat(sk);
360 x25_remove_socket(sk);
361 x25_clear_queues(sk); /* Flush the queues */
363 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
364 if (skb->sk != sk) { /* A pending connection */
366 * Queue the unaccepted socket for death
368 sock_set_flag(skb->sk, SOCK_DEAD);
369 x25_start_heartbeat(skb->sk);
370 x25_sk(skb->sk)->state = X25_STATE_0;
376 if (sk_has_allocations(sk)) {
377 /* Defer: outstanding buffers */
378 sk->sk_timer.expires = jiffies + 10 * HZ;
379 sk->sk_timer.function = x25_destroy_timer;
380 sk->sk_timer.data = (unsigned long)sk;
381 add_timer(&sk->sk_timer);
383 /* drop last reference so sock_put will free */
388 void x25_destroy_socket_from_timer(struct sock *sk)
392 __x25_destroy_socket(sk);
397 static void x25_destroy_socket(struct sock *sk)
401 __x25_destroy_socket(sk);
407 * Handling for system calls applied via the various interfaces to a
408 * X.25 socket object.
411 static int x25_setsockopt(struct socket *sock, int level, int optname,
412 char __user *optval, unsigned int optlen)
415 struct sock *sk = sock->sk;
416 int rc = -ENOPROTOOPT;
419 if (level != SOL_X25 || optname != X25_QBITINCL)
423 if (optlen < sizeof(int))
427 if (get_user(opt, (int __user *)optval))
430 x25_sk(sk)->qbitincl = !!opt;
437 static int x25_getsockopt(struct socket *sock, int level, int optname,
438 char __user *optval, int __user *optlen)
440 struct sock *sk = sock->sk;
441 int val, len, rc = -ENOPROTOOPT;
444 if (level != SOL_X25 || optname != X25_QBITINCL)
448 if (get_user(len, optlen))
451 len = min_t(unsigned int, len, sizeof(int));
458 if (put_user(len, optlen))
461 val = x25_sk(sk)->qbitincl;
462 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
468 static int x25_listen(struct socket *sock, int backlog)
470 struct sock *sk = sock->sk;
471 int rc = -EOPNOTSUPP;
474 if (sk->sk_state != TCP_LISTEN) {
475 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
476 sk->sk_max_ack_backlog = backlog;
477 sk->sk_state = TCP_LISTEN;
485 static struct proto x25_proto = {
487 .owner = THIS_MODULE,
488 .obj_size = sizeof(struct x25_sock),
491 static struct sock *x25_alloc_socket(struct net *net)
493 struct x25_sock *x25;
494 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
499 sock_init_data(NULL, sk);
502 skb_queue_head_init(&x25->ack_queue);
503 skb_queue_head_init(&x25->fragment_queue);
504 skb_queue_head_init(&x25->interrupt_in_queue);
505 skb_queue_head_init(&x25->interrupt_out_queue);
510 static int x25_create(struct net *net, struct socket *sock, int protocol,
514 struct x25_sock *x25;
515 int rc = -ESOCKTNOSUPPORT;
517 if (!net_eq(net, &init_net))
518 return -EAFNOSUPPORT;
520 if (sock->type != SOCK_SEQPACKET || protocol)
524 if ((sk = x25_alloc_socket(net)) == NULL)
529 sock_init_data(sock, sk);
533 sock->ops = &x25_proto_ops;
534 sk->sk_protocol = protocol;
535 sk->sk_backlog_rcv = x25_backlog_rcv;
537 x25->t21 = sysctl_x25_call_request_timeout;
538 x25->t22 = sysctl_x25_reset_request_timeout;
539 x25->t23 = sysctl_x25_clear_request_timeout;
540 x25->t2 = sysctl_x25_ack_holdback_timeout;
541 x25->state = X25_STATE_0;
542 x25->cudmatchlength = 0;
543 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */
546 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE;
547 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
548 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE;
549 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
550 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT;
551 x25->facilities.reverse = X25_DEFAULT_REVERSE;
552 x25->dte_facilities.calling_len = 0;
553 x25->dte_facilities.called_len = 0;
554 memset(x25->dte_facilities.called_ae, '\0',
555 sizeof(x25->dte_facilities.called_ae));
556 memset(x25->dte_facilities.calling_ae, '\0',
557 sizeof(x25->dte_facilities.calling_ae));
564 static struct sock *x25_make_new(struct sock *osk)
566 struct sock *sk = NULL;
567 struct x25_sock *x25, *ox25;
569 if (osk->sk_type != SOCK_SEQPACKET)
572 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
577 sk->sk_type = osk->sk_type;
578 sk->sk_priority = osk->sk_priority;
579 sk->sk_protocol = osk->sk_protocol;
580 sk->sk_rcvbuf = osk->sk_rcvbuf;
581 sk->sk_sndbuf = osk->sk_sndbuf;
582 sk->sk_state = TCP_ESTABLISHED;
583 sk->sk_backlog_rcv = osk->sk_backlog_rcv;
584 sock_copy_flags(sk, osk);
587 x25->t21 = ox25->t21;
588 x25->t22 = ox25->t22;
589 x25->t23 = ox25->t23;
591 x25->facilities = ox25->facilities;
592 x25->qbitincl = ox25->qbitincl;
593 x25->dte_facilities = ox25->dte_facilities;
594 x25->cudmatchlength = ox25->cudmatchlength;
595 x25->accptapprv = ox25->accptapprv;
602 static int x25_release(struct socket *sock)
604 struct sock *sk = sock->sk;
605 struct x25_sock *x25;
613 switch (x25->state) {
617 x25_disconnect(sk, 0, 0, 0);
618 x25_destroy_socket(sk);
624 x25_clear_queues(sk);
625 x25_write_internal(sk, X25_CLEAR_REQUEST);
626 x25_start_t23timer(sk);
627 x25->state = X25_STATE_2;
628 sk->sk_state = TCP_CLOSE;
629 sk->sk_shutdown |= SEND_SHUTDOWN;
630 sk->sk_state_change(sk);
631 sock_set_flag(sk, SOCK_DEAD);
632 sock_set_flag(sk, SOCK_DESTROY);
642 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
644 struct sock *sk = sock->sk;
645 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
649 if (!sock_flag(sk, SOCK_ZAPPED) ||
650 addr_len != sizeof(struct sockaddr_x25) ||
651 addr->sx25_family != AF_X25) {
656 x25_sk(sk)->source_addr = addr->sx25_addr;
657 x25_insert_socket(sk);
658 sock_reset_flag(sk, SOCK_ZAPPED);
659 SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
665 static int x25_wait_for_connection_establishment(struct sock *sk)
667 DECLARE_WAITQUEUE(wait, current);
670 add_wait_queue_exclusive(sk->sk_sleep, &wait);
672 __set_current_state(TASK_INTERRUPTIBLE);
674 if (signal_pending(current))
678 sk->sk_socket->state = SS_UNCONNECTED;
682 if (sk->sk_state != TCP_ESTABLISHED) {
689 __set_current_state(TASK_RUNNING);
690 remove_wait_queue(sk->sk_sleep, &wait);
694 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
695 int addr_len, int flags)
697 struct sock *sk = sock->sk;
698 struct x25_sock *x25 = x25_sk(sk);
699 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
700 struct x25_route *rt;
705 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
706 sock->state = SS_CONNECTED;
707 goto out; /* Connect completed during a ERESTARTSYS event */
711 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
712 sock->state = SS_UNCONNECTED;
716 rc = -EISCONN; /* No reconnect on a seqpacket socket */
717 if (sk->sk_state == TCP_ESTABLISHED)
720 sk->sk_state = TCP_CLOSE;
721 sock->state = SS_UNCONNECTED;
724 if (addr_len != sizeof(struct sockaddr_x25) ||
725 addr->sx25_family != AF_X25)
729 rt = x25_get_route(&addr->sx25_addr);
733 x25->neighbour = x25_get_neigh(rt->dev);
737 x25_limit_facilities(&x25->facilities, x25->neighbour);
739 x25->lci = x25_new_lci(x25->neighbour);
744 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
747 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
748 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
750 x25->dest_addr = addr->sx25_addr;
752 /* Move to connecting socket, start sending Connect Requests */
753 sock->state = SS_CONNECTING;
754 sk->sk_state = TCP_SYN_SENT;
756 x25->state = X25_STATE_1;
758 x25_write_internal(sk, X25_CALL_REQUEST);
760 x25_start_heartbeat(sk);
761 x25_start_t21timer(sk);
765 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
768 rc = x25_wait_for_connection_establishment(sk);
772 sock->state = SS_CONNECTED;
776 x25_neigh_put(x25->neighbour);
785 static int x25_wait_for_data(struct sock *sk, long timeout)
787 DECLARE_WAITQUEUE(wait, current);
790 add_wait_queue_exclusive(sk->sk_sleep, &wait);
792 __set_current_state(TASK_INTERRUPTIBLE);
793 if (sk->sk_shutdown & RCV_SHUTDOWN)
796 if (signal_pending(current))
802 if (skb_queue_empty(&sk->sk_receive_queue)) {
804 timeout = schedule_timeout(timeout);
809 __set_current_state(TASK_RUNNING);
810 remove_wait_queue(sk->sk_sleep, &wait);
814 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
816 struct sock *sk = sock->sk;
822 if (!sk || sk->sk_state != TCP_LISTEN)
826 if (sk->sk_type != SOCK_SEQPACKET)
830 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
833 skb = skb_dequeue(&sk->sk_receive_queue);
838 sock_graft(newsk, newsock);
840 /* Now attach up the new socket */
843 sk->sk_ack_backlog--;
844 newsock->state = SS_CONNECTED;
853 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
854 int *uaddr_len, int peer)
856 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
857 struct sock *sk = sock->sk;
858 struct x25_sock *x25 = x25_sk(sk);
863 if (sk->sk_state != TCP_ESTABLISHED) {
867 sx25->sx25_addr = x25->dest_addr;
869 sx25->sx25_addr = x25->source_addr;
871 sx25->sx25_family = AF_X25;
872 *uaddr_len = sizeof(*sx25);
879 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
885 rc = datagram_poll(file, sock, wait);
891 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
896 struct x25_sock *makex25;
897 struct x25_address source_addr, dest_addr;
898 struct x25_facilities facilities;
899 struct x25_dte_facilities dte_facilities;
900 int len, addr_len, rc;
903 * Remove the LCI and frame type.
905 skb_pull(skb, X25_STD_MIN_LEN);
908 * Extract the X.25 addresses and convert them to ASCII strings,
911 addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
912 skb_pull(skb, addr_len);
915 * Get the length of the facilities, skip past them for the moment
916 * get the call user data because this is needed to determine
917 * the correct listener
919 len = skb->data[0] + 1;
923 * Find a listener for the particular address/cud pair.
925 sk = x25_find_listener(&source_addr,skb);
928 if (sk != NULL && sk_acceptq_is_full(sk)) {
933 * We dont have any listeners for this incoming call.
937 skb_push(skb, addr_len + X25_STD_MIN_LEN);
938 if (sysctl_x25_forward &&
939 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
941 /* Call was forwarded, dont process it any more */
946 /* No listeners, can't forward, clear the call */
947 goto out_clear_request;
952 * Try to reach a compromise on the requested facilities.
954 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
959 * current neighbour/link might impose additional limits
960 * on certain facilties
963 x25_limit_facilities(&facilities, nb);
966 * Try to create a new socket.
968 make = x25_make_new(sk);
973 * Remove the facilities
978 make->sk_state = TCP_ESTABLISHED;
980 makex25 = x25_sk(make);
982 makex25->dest_addr = dest_addr;
983 makex25->source_addr = source_addr;
984 makex25->neighbour = nb;
985 makex25->facilities = facilities;
986 makex25->dte_facilities= dte_facilities;
987 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
988 /* ensure no reverse facil on accept */
989 makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
990 /* ensure no calling address extension on accept */
991 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
992 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
994 /* Normally all calls are accepted immediatly */
995 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
996 x25_write_internal(make, X25_CALL_ACCEPTED);
997 makex25->state = X25_STATE_3;
1001 * Incoming Call User Data.
1003 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1004 makex25->calluserdata.cudlength = skb->len;
1006 sk->sk_ack_backlog++;
1008 x25_insert_socket(make);
1010 skb_queue_head(&sk->sk_receive_queue, skb);
1012 x25_start_heartbeat(make);
1014 if (!sock_flag(sk, SOCK_DEAD))
1015 sk->sk_data_ready(sk, skb->len);
1024 x25_transmit_clear_request(nb, lci, 0x01);
1028 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1029 struct msghdr *msg, size_t len)
1031 struct sock *sk = sock->sk;
1032 struct x25_sock *x25 = x25_sk(sk);
1033 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1034 struct sockaddr_x25 sx25;
1035 struct sk_buff *skb;
1036 unsigned char *asmptr;
1037 int noblock = msg->msg_flags & MSG_DONTWAIT;
1039 int qbit = 0, rc = -EINVAL;
1042 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1045 /* we currently don't support segmented records at the user interface */
1046 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1049 rc = -EADDRNOTAVAIL;
1050 if (sock_flag(sk, SOCK_ZAPPED))
1054 if (sk->sk_shutdown & SEND_SHUTDOWN) {
1055 send_sig(SIGPIPE, current, 0);
1060 if (!x25->neighbour)
1065 if (msg->msg_namelen < sizeof(sx25))
1067 memcpy(&sx25, usx25, sizeof(sx25));
1069 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1072 if (sx25.sx25_family != AF_X25)
1076 * FIXME 1003.1g - if the socket is like this because
1077 * it has become closed (not started closed) we ought
1078 * to SIGPIPE, EPIPE;
1081 if (sk->sk_state != TCP_ESTABLISHED)
1084 sx25.sx25_family = AF_X25;
1085 sx25.sx25_addr = x25->dest_addr;
1088 /* Sanity check the packet size */
1094 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1096 /* Build a packet */
1097 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1099 if ((msg->msg_flags & MSG_OOB) && len > 32)
1102 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1104 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1107 X25_SKB_CB(skb)->flags = msg->msg_flags;
1109 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1112 * Put the data on the end
1114 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1116 skb_reset_transport_header(skb);
1119 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1124 * If the Q BIT Include socket option is in force, the first
1125 * byte of the user data is the logical value of the Q Bit.
1127 if (x25->qbitincl) {
1128 qbit = skb->data[0];
1133 * Push down the X.25 header
1135 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1137 if (msg->msg_flags & MSG_OOB) {
1138 if (x25->neighbour->extended) {
1139 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1140 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1141 *asmptr++ = (x25->lci >> 0) & 0xFF;
1142 *asmptr++ = X25_INTERRUPT;
1144 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1145 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1146 *asmptr++ = (x25->lci >> 0) & 0xFF;
1147 *asmptr++ = X25_INTERRUPT;
1150 if (x25->neighbour->extended) {
1151 /* Build an Extended X.25 header */
1152 asmptr = skb_push(skb, X25_EXT_MIN_LEN);
1153 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1154 *asmptr++ = (x25->lci >> 0) & 0xFF;
1155 *asmptr++ = X25_DATA;
1156 *asmptr++ = X25_DATA;
1158 /* Build an Standard X.25 header */
1159 asmptr = skb_push(skb, X25_STD_MIN_LEN);
1160 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1161 *asmptr++ = (x25->lci >> 0) & 0xFF;
1162 *asmptr++ = X25_DATA;
1166 skb->data[0] |= X25_Q_BIT;
1169 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1170 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1173 if (sk->sk_state != TCP_ESTABLISHED)
1176 if (msg->msg_flags & MSG_OOB)
1177 skb_queue_tail(&x25->interrupt_out_queue, skb);
1179 rc = x25_output(sk, skb);
1183 else if (x25->qbitincl)
1188 * lock_sock() is currently only used to serialize this x25_kick()
1189 * against input-driven x25_kick() calls. It currently only blocks
1190 * incoming packets for this socket and does not protect against
1191 * any other socket state changes and is not called from anywhere
1192 * else. As x25_kick() cannot block and as long as all socket
1193 * operations are BKL-wrapped, we don't need take to care about
1194 * purging the backlog queue in x25_release().
1196 * Using lock_sock() to protect all socket operations entirely
1197 * (and making the whole x25 stack SMP aware) unfortunately would
1198 * require major changes to {send,recv}msg and skb allocation methods.
1214 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1215 struct msghdr *msg, size_t size,
1218 struct sock *sk = sock->sk;
1219 struct x25_sock *x25 = x25_sk(sk);
1220 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1223 struct sk_buff *skb;
1224 unsigned char *asmptr;
1229 * This works for seqpacket too. The receiver has ordered the queue for
1230 * us! We do one quick check first though
1232 if (sk->sk_state != TCP_ESTABLISHED)
1235 if (flags & MSG_OOB) {
1237 if (sock_flag(sk, SOCK_URGINLINE) ||
1238 !skb_peek(&x25->interrupt_in_queue))
1241 skb = skb_dequeue(&x25->interrupt_in_queue);
1243 skb_pull(skb, X25_STD_MIN_LEN);
1246 * No Q bit information on Interrupt data.
1248 if (x25->qbitincl) {
1249 asmptr = skb_push(skb, 1);
1253 msg->msg_flags |= MSG_OOB;
1255 /* Now we can treat all alike */
1256 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1257 flags & MSG_DONTWAIT, &rc);
1261 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1263 skb_pull(skb, x25->neighbour->extended ?
1264 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1266 if (x25->qbitincl) {
1267 asmptr = skb_push(skb, 1);
1272 skb_reset_transport_header(skb);
1275 if (copied > size) {
1277 msg->msg_flags |= MSG_TRUNC;
1280 /* Currently, each datagram always contains a complete record */
1281 msg->msg_flags |= MSG_EOR;
1283 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1285 goto out_free_dgram;
1288 sx25->sx25_family = AF_X25;
1289 sx25->sx25_addr = x25->dest_addr;
1292 msg->msg_namelen = sizeof(struct sockaddr_x25);
1299 skb_free_datagram(sk, skb);
1306 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1308 struct sock *sk = sock->sk;
1309 struct x25_sock *x25 = x25_sk(sk);
1310 void __user *argp = (void __user *)arg;
1316 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1320 rc = put_user(amount, (unsigned int __user *)argp);
1325 struct sk_buff *skb;
1328 * These two are safe on a single CPU system as
1329 * only user tasks fiddle here
1331 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1333 rc = put_user(amount, (unsigned int __user *)argp);
1340 rc = sock_get_timestamp(sk,
1341 (struct timeval __user *)argp);
1346 rc = sock_get_timestampns(sk,
1347 (struct timespec __user *)argp);
1351 case SIOCGIFDSTADDR:
1352 case SIOCSIFDSTADDR:
1353 case SIOCGIFBRDADDR:
1354 case SIOCSIFBRDADDR:
1355 case SIOCGIFNETMASK:
1356 case SIOCSIFNETMASK:
1364 if (!capable(CAP_NET_ADMIN))
1366 rc = x25_route_ioctl(cmd, argp);
1368 case SIOCX25GSUBSCRIP:
1369 rc = x25_subscr_ioctl(cmd, argp);
1371 case SIOCX25SSUBSCRIP:
1373 if (!capable(CAP_NET_ADMIN))
1375 rc = x25_subscr_ioctl(cmd, argp);
1377 case SIOCX25GFACILITIES: {
1378 struct x25_facilities fac = x25->facilities;
1379 rc = copy_to_user(argp, &fac,
1380 sizeof(fac)) ? -EFAULT : 0;
1384 case SIOCX25SFACILITIES: {
1385 struct x25_facilities facilities;
1387 if (copy_from_user(&facilities, argp,
1388 sizeof(facilities)))
1391 if (sk->sk_state != TCP_LISTEN &&
1392 sk->sk_state != TCP_CLOSE)
1394 if (facilities.pacsize_in < X25_PS16 ||
1395 facilities.pacsize_in > X25_PS4096)
1397 if (facilities.pacsize_out < X25_PS16 ||
1398 facilities.pacsize_out > X25_PS4096)
1400 if (facilities.winsize_in < 1 ||
1401 facilities.winsize_in > 127)
1403 if (facilities.throughput < 0x03 ||
1404 facilities.throughput > 0xDD)
1406 if (facilities.reverse &&
1407 (facilities.reverse & 0x81) != 0x81)
1409 x25->facilities = facilities;
1414 case SIOCX25GDTEFACILITIES: {
1415 rc = copy_to_user(argp, &x25->dte_facilities,
1416 sizeof(x25->dte_facilities));
1422 case SIOCX25SDTEFACILITIES: {
1423 struct x25_dte_facilities dtefacs;
1425 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1428 if (sk->sk_state != TCP_LISTEN &&
1429 sk->sk_state != TCP_CLOSE)
1431 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1433 if (dtefacs.calling_ae == NULL)
1435 if (dtefacs.called_len > X25_MAX_AE_LEN)
1437 if (dtefacs.called_ae == NULL)
1439 x25->dte_facilities = dtefacs;
1444 case SIOCX25GCALLUSERDATA: {
1445 struct x25_calluserdata cud = x25->calluserdata;
1446 rc = copy_to_user(argp, &cud,
1447 sizeof(cud)) ? -EFAULT : 0;
1451 case SIOCX25SCALLUSERDATA: {
1452 struct x25_calluserdata calluserdata;
1455 if (copy_from_user(&calluserdata, argp,
1456 sizeof(calluserdata)))
1459 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1461 x25->calluserdata = calluserdata;
1466 case SIOCX25GCAUSEDIAG: {
1467 struct x25_causediag causediag;
1468 causediag = x25->causediag;
1469 rc = copy_to_user(argp, &causediag,
1470 sizeof(causediag)) ? -EFAULT : 0;
1474 case SIOCX25SCAUSEDIAG: {
1475 struct x25_causediag causediag;
1477 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1479 x25->causediag = causediag;
1485 case SIOCX25SCUDMATCHLEN: {
1486 struct x25_subaddr sub_addr;
1488 if(sk->sk_state != TCP_CLOSE)
1491 if (copy_from_user(&sub_addr, argp,
1495 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1497 x25->cudmatchlength = sub_addr.cudmatchlength;
1502 case SIOCX25CALLACCPTAPPRV: {
1504 if (sk->sk_state != TCP_CLOSE)
1506 x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1511 case SIOCX25SENDCALLACCPT: {
1513 if (sk->sk_state != TCP_ESTABLISHED)
1515 if (x25->accptapprv) /* must call accptapprv above */
1517 x25_write_internal(sk, X25_CALL_ACCEPTED);
1518 x25->state = X25_STATE_3;
1532 static const struct net_proto_family x25_family_ops = {
1534 .create = x25_create,
1535 .owner = THIS_MODULE,
1538 #ifdef CONFIG_COMPAT
1539 static int compat_x25_subscr_ioctl(unsigned int cmd,
1540 struct compat_x25_subscrip_struct __user *x25_subscr32)
1542 struct compat_x25_subscrip_struct x25_subscr;
1543 struct x25_neigh *nb;
1544 struct net_device *dev;
1548 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1552 dev = x25_dev_get(x25_subscr.device);
1556 nb = x25_get_neigh(dev);
1562 if (cmd == SIOCX25GSUBSCRIP) {
1563 x25_subscr.extended = nb->extended;
1564 x25_subscr.global_facil_mask = nb->global_facil_mask;
1565 rc = copy_to_user(x25_subscr32, &x25_subscr,
1566 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1569 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1571 nb->extended = x25_subscr.extended;
1572 nb->global_facil_mask = x25_subscr.global_facil_mask;
1583 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1586 void __user *argp = compat_ptr(arg);
1587 struct sock *sk = sock->sk;
1589 int rc = -ENOIOCTLCMD;
1594 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1600 rc = compat_sock_get_timestamp(sk,
1601 (struct timeval __user*)argp);
1608 rc = compat_sock_get_timestampns(sk,
1609 (struct timespec __user*)argp);
1614 case SIOCGIFDSTADDR:
1615 case SIOCSIFDSTADDR:
1616 case SIOCGIFBRDADDR:
1617 case SIOCSIFBRDADDR:
1618 case SIOCGIFNETMASK:
1619 case SIOCSIFNETMASK:
1627 if (!capable(CAP_NET_ADMIN))
1630 rc = x25_route_ioctl(cmd, argp);
1633 case SIOCX25GSUBSCRIP:
1635 rc = compat_x25_subscr_ioctl(cmd, argp);
1638 case SIOCX25SSUBSCRIP:
1640 if (!capable(CAP_NET_ADMIN))
1643 rc = compat_x25_subscr_ioctl(cmd, argp);
1646 case SIOCX25GFACILITIES:
1647 case SIOCX25SFACILITIES:
1648 case SIOCX25GDTEFACILITIES:
1649 case SIOCX25SDTEFACILITIES:
1650 case SIOCX25GCALLUSERDATA:
1651 case SIOCX25SCALLUSERDATA:
1652 case SIOCX25GCAUSEDIAG:
1653 case SIOCX25SCAUSEDIAG:
1654 case SIOCX25SCUDMATCHLEN:
1655 case SIOCX25CALLACCPTAPPRV:
1656 case SIOCX25SENDCALLACCPT:
1657 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1667 static const struct proto_ops x25_proto_ops = {
1669 .owner = THIS_MODULE,
1670 .release = x25_release,
1672 .connect = x25_connect,
1673 .socketpair = sock_no_socketpair,
1674 .accept = x25_accept,
1675 .getname = x25_getname,
1676 .poll = x25_datagram_poll,
1678 #ifdef CONFIG_COMPAT
1679 .compat_ioctl = compat_x25_ioctl,
1681 .listen = x25_listen,
1682 .shutdown = sock_no_shutdown,
1683 .setsockopt = x25_setsockopt,
1684 .getsockopt = x25_getsockopt,
1685 .sendmsg = x25_sendmsg,
1686 .recvmsg = x25_recvmsg,
1687 .mmap = sock_no_mmap,
1688 .sendpage = sock_no_sendpage,
1691 static struct packet_type x25_packet_type __read_mostly = {
1692 .type = cpu_to_be16(ETH_P_X25),
1693 .func = x25_lapb_receive_frame,
1696 static struct notifier_block x25_dev_notifier = {
1697 .notifier_call = x25_device_event,
1700 void x25_kill_by_neigh(struct x25_neigh *nb)
1703 struct hlist_node *node;
1705 write_lock_bh(&x25_list_lock);
1707 sk_for_each(s, node, &x25_list)
1708 if (x25_sk(s)->neighbour == nb)
1709 x25_disconnect(s, ENETUNREACH, 0, 0);
1711 write_unlock_bh(&x25_list_lock);
1713 /* Remove any related forwards */
1714 x25_clear_forward_by_dev(nb->dev);
1717 static int __init x25_init(void)
1719 int rc = proto_register(&x25_proto, 0);
1724 rc = sock_register(&x25_family_ops);
1728 dev_add_pack(&x25_packet_type);
1730 rc = register_netdevice_notifier(&x25_dev_notifier);
1734 printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1736 x25_register_sysctl();
1737 rc = x25_proc_init();
1743 unregister_netdevice_notifier(&x25_dev_notifier);
1745 sock_unregister(AF_X25);
1747 proto_unregister(&x25_proto);
1750 module_init(x25_init);
1752 static void __exit x25_exit(void)
1758 x25_unregister_sysctl();
1760 unregister_netdevice_notifier(&x25_dev_notifier);
1762 dev_remove_pack(&x25_packet_type);
1764 sock_unregister(AF_X25);
1765 proto_unregister(&x25_proto);
1767 module_exit(x25_exit);
1769 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1770 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1771 MODULE_LICENSE("GPL");
1772 MODULE_ALIAS_NETPROTO(PF_X25);