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/timer.h>
44 #include <linux/string.h>
45 #include <linux/net.h>
46 #include <linux/netdevice.h>
47 #include <linux/if_arp.h>
48 #include <linux/skbuff.h>
50 #include <net/tcp_states.h>
51 #include <asm/uaccess.h>
52 #include <linux/fcntl.h>
53 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
54 #include <linux/notifier.h>
55 #include <linux/init.h>
56 #include <linux/compat.h>
59 #include <net/compat.h>
61 int sysctl_x25_restart_request_timeout
= X25_DEFAULT_T20
;
62 int sysctl_x25_call_request_timeout
= X25_DEFAULT_T21
;
63 int sysctl_x25_reset_request_timeout
= X25_DEFAULT_T22
;
64 int sysctl_x25_clear_request_timeout
= X25_DEFAULT_T23
;
65 int sysctl_x25_ack_holdback_timeout
= X25_DEFAULT_T2
;
66 int sysctl_x25_forward
= 0;
69 DEFINE_RWLOCK(x25_list_lock
);
71 static const struct proto_ops x25_proto_ops
;
73 static struct x25_address null_x25_address
= {" "};
76 struct compat_x25_subscrip_struct
{
77 char device
[200-sizeof(compat_ulong_t
)];
78 compat_ulong_t global_facil_mask
;
79 compat_uint_t extended
;
83 int x25_addr_ntoa(unsigned char *p
, struct x25_address
*called_addr
,
84 struct x25_address
*calling_addr
)
86 unsigned int called_len
, calling_len
;
87 char *called
, *calling
;
90 called_len
= (*p
>> 0) & 0x0F;
91 calling_len
= (*p
>> 4) & 0x0F;
93 called
= called_addr
->x25_addr
;
94 calling
= calling_addr
->x25_addr
;
97 for (i
= 0; i
< (called_len
+ calling_len
); i
++) {
100 *called
++ = ((*p
>> 0) & 0x0F) + '0';
103 *called
++ = ((*p
>> 4) & 0x0F) + '0';
107 *calling
++ = ((*p
>> 0) & 0x0F) + '0';
110 *calling
++ = ((*p
>> 4) & 0x0F) + '0';
115 *called
= *calling
= '\0';
117 return 1 + (called_len
+ calling_len
+ 1) / 2;
120 int x25_addr_aton(unsigned char *p
, struct x25_address
*called_addr
,
121 struct x25_address
*calling_addr
)
123 unsigned int called_len
, calling_len
;
124 char *called
, *calling
;
127 called
= called_addr
->x25_addr
;
128 calling
= calling_addr
->x25_addr
;
130 called_len
= strlen(called
);
131 calling_len
= strlen(calling
);
133 *p
++ = (calling_len
<< 4) | (called_len
<< 0);
135 for (i
= 0; i
< (called_len
+ calling_len
); i
++) {
136 if (i
< called_len
) {
138 *p
|= (*called
++ - '0') << 0;
142 *p
|= (*called
++ - '0') << 4;
146 *p
|= (*calling
++ - '0') << 0;
150 *p
|= (*calling
++ - '0') << 4;
155 return 1 + (called_len
+ calling_len
+ 1) / 2;
159 * Socket removal during an interrupt is now safe.
161 static void x25_remove_socket(struct sock
*sk
)
163 write_lock_bh(&x25_list_lock
);
164 sk_del_node_init(sk
);
165 write_unlock_bh(&x25_list_lock
);
169 * Kill all bound sockets on a dropped device.
171 static void x25_kill_by_device(struct net_device
*dev
)
174 struct hlist_node
*node
;
176 write_lock_bh(&x25_list_lock
);
178 sk_for_each(s
, node
, &x25_list
)
179 if (x25_sk(s
)->neighbour
&& x25_sk(s
)->neighbour
->dev
== dev
)
180 x25_disconnect(s
, ENETUNREACH
, 0, 0);
182 write_unlock_bh(&x25_list_lock
);
186 * Handle device status changes.
188 static int x25_device_event(struct notifier_block
*this, unsigned long event
,
191 struct net_device
*dev
= ptr
;
192 struct x25_neigh
*nb
;
194 if (!net_eq(dev_net(dev
), &init_net
))
197 if (dev
->type
== ARPHRD_X25
198 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
199 || dev
->type
== ARPHRD_ETHER
204 x25_link_device_up(dev
);
206 case NETDEV_GOING_DOWN
:
207 nb
= x25_get_neigh(dev
);
209 x25_terminate_link(nb
);
214 x25_kill_by_device(dev
);
215 x25_route_device_down(dev
);
216 x25_link_device_down(dev
);
225 * Add a socket to the bound sockets list.
227 static void x25_insert_socket(struct sock
*sk
)
229 write_lock_bh(&x25_list_lock
);
230 sk_add_node(sk
, &x25_list
);
231 write_unlock_bh(&x25_list_lock
);
235 * Find a socket that wants to accept the Call Request we just
236 * received. Check the full list for an address/cud match.
237 * If no cuds match return the next_best thing, an address match.
238 * Note: if a listening socket has cud set it must only get calls
241 static struct sock
*x25_find_listener(struct x25_address
*addr
,
245 struct sock
*next_best
;
246 struct hlist_node
*node
;
248 read_lock_bh(&x25_list_lock
);
251 sk_for_each(s
, node
, &x25_list
)
252 if ((!strcmp(addr
->x25_addr
,
253 x25_sk(s
)->source_addr
.x25_addr
) ||
254 !strcmp(addr
->x25_addr
,
255 null_x25_address
.x25_addr
)) &&
256 s
->sk_state
== TCP_LISTEN
) {
258 * Found a listening socket, now check the incoming
259 * call user data vs this sockets call user data
261 if(skb
->len
> 0 && x25_sk(s
)->cudmatchlength
> 0) {
262 if((memcmp(x25_sk(s
)->calluserdata
.cuddata
,
264 x25_sk(s
)->cudmatchlength
)) == 0) {
278 read_unlock_bh(&x25_list_lock
);
283 * Find a connected X.25 socket given my LCI and neighbour.
285 static struct sock
*__x25_find_socket(unsigned int lci
, struct x25_neigh
*nb
)
288 struct hlist_node
*node
;
290 sk_for_each(s
, node
, &x25_list
)
291 if (x25_sk(s
)->lci
== lci
&& x25_sk(s
)->neighbour
== nb
) {
300 struct sock
*x25_find_socket(unsigned int lci
, struct x25_neigh
*nb
)
304 read_lock_bh(&x25_list_lock
);
305 s
= __x25_find_socket(lci
, nb
);
306 read_unlock_bh(&x25_list_lock
);
311 * Find a unique LCI for a given device.
313 static unsigned int x25_new_lci(struct x25_neigh
*nb
)
315 unsigned int lci
= 1;
318 read_lock_bh(&x25_list_lock
);
320 while ((sk
= __x25_find_socket(lci
, nb
)) != NULL
) {
328 read_unlock_bh(&x25_list_lock
);
335 static void __x25_destroy_socket(struct sock
*);
338 * handler for deferred kills.
340 static void x25_destroy_timer(unsigned long data
)
342 x25_destroy_socket_from_timer((struct sock
*)data
);
346 * This is called from user mode and the timers. Thus it protects itself
347 * against interrupt users but doesn't worry about being called during
348 * work. Once it is removed from the queue no interrupt or bottom half
349 * will touch it and we are (fairly 8-) ) safe.
350 * Not static as it's used by the timer
352 static void __x25_destroy_socket(struct sock
*sk
)
356 x25_stop_heartbeat(sk
);
359 x25_remove_socket(sk
);
360 x25_clear_queues(sk
); /* Flush the queues */
362 while ((skb
= skb_dequeue(&sk
->sk_receive_queue
)) != NULL
) {
363 if (skb
->sk
!= sk
) { /* A pending connection */
365 * Queue the unaccepted socket for death
367 sock_set_flag(skb
->sk
, SOCK_DEAD
);
368 x25_start_heartbeat(skb
->sk
);
369 x25_sk(skb
->sk
)->state
= X25_STATE_0
;
375 if (sk_has_allocations(sk
)) {
376 /* Defer: outstanding buffers */
377 sk
->sk_timer
.expires
= jiffies
+ 10 * HZ
;
378 sk
->sk_timer
.function
= x25_destroy_timer
;
379 sk
->sk_timer
.data
= (unsigned long)sk
;
380 add_timer(&sk
->sk_timer
);
382 /* drop last reference so sock_put will free */
387 void x25_destroy_socket_from_timer(struct sock
*sk
)
391 __x25_destroy_socket(sk
);
396 static void x25_destroy_socket(struct sock
*sk
)
400 __x25_destroy_socket(sk
);
406 * Handling for system calls applied via the various interfaces to a
407 * X.25 socket object.
410 static int x25_setsockopt(struct socket
*sock
, int level
, int optname
,
411 char __user
*optval
, int optlen
)
414 struct sock
*sk
= sock
->sk
;
415 int rc
= -ENOPROTOOPT
;
417 if (level
!= SOL_X25
|| optname
!= X25_QBITINCL
)
421 if (optlen
< sizeof(int))
425 if (get_user(opt
, (int __user
*)optval
))
428 x25_sk(sk
)->qbitincl
= !!opt
;
434 static int x25_getsockopt(struct socket
*sock
, int level
, int optname
,
435 char __user
*optval
, int __user
*optlen
)
437 struct sock
*sk
= sock
->sk
;
438 int val
, len
, rc
= -ENOPROTOOPT
;
440 if (level
!= SOL_X25
|| optname
!= X25_QBITINCL
)
444 if (get_user(len
, optlen
))
447 len
= min_t(unsigned int, len
, sizeof(int));
454 if (put_user(len
, optlen
))
457 val
= x25_sk(sk
)->qbitincl
;
458 rc
= copy_to_user(optval
, &val
, len
) ? -EFAULT
: 0;
463 static int x25_listen(struct socket
*sock
, int backlog
)
465 struct sock
*sk
= sock
->sk
;
466 int rc
= -EOPNOTSUPP
;
468 if (sk
->sk_state
!= TCP_LISTEN
) {
469 memset(&x25_sk(sk
)->dest_addr
, 0, X25_ADDR_LEN
);
470 sk
->sk_max_ack_backlog
= backlog
;
471 sk
->sk_state
= TCP_LISTEN
;
478 static struct proto x25_proto
= {
480 .owner
= THIS_MODULE
,
481 .obj_size
= sizeof(struct x25_sock
),
484 static struct sock
*x25_alloc_socket(struct net
*net
)
486 struct x25_sock
*x25
;
487 struct sock
*sk
= sk_alloc(net
, AF_X25
, GFP_ATOMIC
, &x25_proto
);
492 sock_init_data(NULL
, sk
);
495 skb_queue_head_init(&x25
->ack_queue
);
496 skb_queue_head_init(&x25
->fragment_queue
);
497 skb_queue_head_init(&x25
->interrupt_in_queue
);
498 skb_queue_head_init(&x25
->interrupt_out_queue
);
503 static int x25_create(struct net
*net
, struct socket
*sock
, int protocol
)
506 struct x25_sock
*x25
;
507 int rc
= -ESOCKTNOSUPPORT
;
509 if (net
!= &init_net
)
510 return -EAFNOSUPPORT
;
512 if (sock
->type
!= SOCK_SEQPACKET
|| protocol
)
516 if ((sk
= x25_alloc_socket(net
)) == NULL
)
521 sock_init_data(sock
, sk
);
525 sock
->ops
= &x25_proto_ops
;
526 sk
->sk_protocol
= protocol
;
527 sk
->sk_backlog_rcv
= x25_backlog_rcv
;
529 x25
->t21
= sysctl_x25_call_request_timeout
;
530 x25
->t22
= sysctl_x25_reset_request_timeout
;
531 x25
->t23
= sysctl_x25_clear_request_timeout
;
532 x25
->t2
= sysctl_x25_ack_holdback_timeout
;
533 x25
->state
= X25_STATE_0
;
534 x25
->cudmatchlength
= 0;
535 x25
->accptapprv
= X25_DENY_ACCPT_APPRV
; /* normally no cud */
538 x25
->facilities
.winsize_in
= X25_DEFAULT_WINDOW_SIZE
;
539 x25
->facilities
.winsize_out
= X25_DEFAULT_WINDOW_SIZE
;
540 x25
->facilities
.pacsize_in
= X25_DEFAULT_PACKET_SIZE
;
541 x25
->facilities
.pacsize_out
= X25_DEFAULT_PACKET_SIZE
;
542 x25
->facilities
.throughput
= X25_DEFAULT_THROUGHPUT
;
543 x25
->facilities
.reverse
= X25_DEFAULT_REVERSE
;
544 x25
->dte_facilities
.calling_len
= 0;
545 x25
->dte_facilities
.called_len
= 0;
546 memset(x25
->dte_facilities
.called_ae
, '\0',
547 sizeof(x25
->dte_facilities
.called_ae
));
548 memset(x25
->dte_facilities
.calling_ae
, '\0',
549 sizeof(x25
->dte_facilities
.calling_ae
));
556 static struct sock
*x25_make_new(struct sock
*osk
)
558 struct sock
*sk
= NULL
;
559 struct x25_sock
*x25
, *ox25
;
561 if (osk
->sk_type
!= SOCK_SEQPACKET
)
564 if ((sk
= x25_alloc_socket(sock_net(osk
))) == NULL
)
569 sk
->sk_type
= osk
->sk_type
;
570 sk
->sk_priority
= osk
->sk_priority
;
571 sk
->sk_protocol
= osk
->sk_protocol
;
572 sk
->sk_rcvbuf
= osk
->sk_rcvbuf
;
573 sk
->sk_sndbuf
= osk
->sk_sndbuf
;
574 sk
->sk_state
= TCP_ESTABLISHED
;
575 sk
->sk_backlog_rcv
= osk
->sk_backlog_rcv
;
576 sock_copy_flags(sk
, osk
);
579 x25
->t21
= ox25
->t21
;
580 x25
->t22
= ox25
->t22
;
581 x25
->t23
= ox25
->t23
;
583 x25
->facilities
= ox25
->facilities
;
584 x25
->qbitincl
= ox25
->qbitincl
;
585 x25
->dte_facilities
= ox25
->dte_facilities
;
586 x25
->cudmatchlength
= ox25
->cudmatchlength
;
587 x25
->accptapprv
= ox25
->accptapprv
;
594 static int x25_release(struct socket
*sock
)
596 struct sock
*sk
= sock
->sk
;
597 struct x25_sock
*x25
;
604 switch (x25
->state
) {
608 x25_disconnect(sk
, 0, 0, 0);
609 x25_destroy_socket(sk
);
615 x25_clear_queues(sk
);
616 x25_write_internal(sk
, X25_CLEAR_REQUEST
);
617 x25_start_t23timer(sk
);
618 x25
->state
= X25_STATE_2
;
619 sk
->sk_state
= TCP_CLOSE
;
620 sk
->sk_shutdown
|= SEND_SHUTDOWN
;
621 sk
->sk_state_change(sk
);
622 sock_set_flag(sk
, SOCK_DEAD
);
623 sock_set_flag(sk
, SOCK_DESTROY
);
632 static int x25_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addr_len
)
634 struct sock
*sk
= sock
->sk
;
635 struct sockaddr_x25
*addr
= (struct sockaddr_x25
*)uaddr
;
637 if (!sock_flag(sk
, SOCK_ZAPPED
) ||
638 addr_len
!= sizeof(struct sockaddr_x25
) ||
639 addr
->sx25_family
!= AF_X25
)
642 x25_sk(sk
)->source_addr
= addr
->sx25_addr
;
643 x25_insert_socket(sk
);
644 sock_reset_flag(sk
, SOCK_ZAPPED
);
645 SOCK_DEBUG(sk
, "x25_bind: socket is bound\n");
650 static int x25_wait_for_connection_establishment(struct sock
*sk
)
652 DECLARE_WAITQUEUE(wait
, current
);
655 add_wait_queue_exclusive(sk
->sk_sleep
, &wait
);
657 __set_current_state(TASK_INTERRUPTIBLE
);
659 if (signal_pending(current
))
663 sk
->sk_socket
->state
= SS_UNCONNECTED
;
667 if (sk
->sk_state
!= TCP_ESTABLISHED
) {
674 __set_current_state(TASK_RUNNING
);
675 remove_wait_queue(sk
->sk_sleep
, &wait
);
679 static int x25_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
680 int addr_len
, int flags
)
682 struct sock
*sk
= sock
->sk
;
683 struct x25_sock
*x25
= x25_sk(sk
);
684 struct sockaddr_x25
*addr
= (struct sockaddr_x25
*)uaddr
;
685 struct x25_route
*rt
;
689 if (sk
->sk_state
== TCP_ESTABLISHED
&& sock
->state
== SS_CONNECTING
) {
690 sock
->state
= SS_CONNECTED
;
691 goto out
; /* Connect completed during a ERESTARTSYS event */
695 if (sk
->sk_state
== TCP_CLOSE
&& sock
->state
== SS_CONNECTING
) {
696 sock
->state
= SS_UNCONNECTED
;
700 rc
= -EISCONN
; /* No reconnect on a seqpacket socket */
701 if (sk
->sk_state
== TCP_ESTABLISHED
)
704 sk
->sk_state
= TCP_CLOSE
;
705 sock
->state
= SS_UNCONNECTED
;
708 if (addr_len
!= sizeof(struct sockaddr_x25
) ||
709 addr
->sx25_family
!= AF_X25
)
713 rt
= x25_get_route(&addr
->sx25_addr
);
717 x25
->neighbour
= x25_get_neigh(rt
->dev
);
721 x25_limit_facilities(&x25
->facilities
, x25
->neighbour
);
723 x25
->lci
= x25_new_lci(x25
->neighbour
);
728 if (sock_flag(sk
, SOCK_ZAPPED
)) /* Must bind first - autobinding does not work */
731 if (!strcmp(x25
->source_addr
.x25_addr
, null_x25_address
.x25_addr
))
732 memset(&x25
->source_addr
, '\0', X25_ADDR_LEN
);
734 x25
->dest_addr
= addr
->sx25_addr
;
736 /* Move to connecting socket, start sending Connect Requests */
737 sock
->state
= SS_CONNECTING
;
738 sk
->sk_state
= TCP_SYN_SENT
;
740 x25
->state
= X25_STATE_1
;
742 x25_write_internal(sk
, X25_CALL_REQUEST
);
744 x25_start_heartbeat(sk
);
745 x25_start_t21timer(sk
);
749 if (sk
->sk_state
!= TCP_ESTABLISHED
&& (flags
& O_NONBLOCK
))
752 rc
= x25_wait_for_connection_establishment(sk
);
756 sock
->state
= SS_CONNECTED
;
760 x25_neigh_put(x25
->neighbour
);
768 static int x25_wait_for_data(struct sock
*sk
, long timeout
)
770 DECLARE_WAITQUEUE(wait
, current
);
773 add_wait_queue_exclusive(sk
->sk_sleep
, &wait
);
775 __set_current_state(TASK_INTERRUPTIBLE
);
776 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
779 if (signal_pending(current
))
785 if (skb_queue_empty(&sk
->sk_receive_queue
)) {
787 timeout
= schedule_timeout(timeout
);
792 __set_current_state(TASK_RUNNING
);
793 remove_wait_queue(sk
->sk_sleep
, &wait
);
797 static int x25_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
799 struct sock
*sk
= sock
->sk
;
804 if (!sk
|| sk
->sk_state
!= TCP_LISTEN
)
808 if (sk
->sk_type
!= SOCK_SEQPACKET
)
812 rc
= x25_wait_for_data(sk
, sk
->sk_rcvtimeo
);
815 skb
= skb_dequeue(&sk
->sk_receive_queue
);
820 sock_graft(newsk
, newsock
);
822 /* Now attach up the new socket */
825 sk
->sk_ack_backlog
--;
826 newsock
->state
= SS_CONNECTED
;
834 static int x25_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
835 int *uaddr_len
, int peer
)
837 struct sockaddr_x25
*sx25
= (struct sockaddr_x25
*)uaddr
;
838 struct sock
*sk
= sock
->sk
;
839 struct x25_sock
*x25
= x25_sk(sk
);
842 if (sk
->sk_state
!= TCP_ESTABLISHED
)
844 sx25
->sx25_addr
= x25
->dest_addr
;
846 sx25
->sx25_addr
= x25
->source_addr
;
848 sx25
->sx25_family
= AF_X25
;
849 *uaddr_len
= sizeof(*sx25
);
854 int x25_rx_call_request(struct sk_buff
*skb
, struct x25_neigh
*nb
,
859 struct x25_sock
*makex25
;
860 struct x25_address source_addr
, dest_addr
;
861 struct x25_facilities facilities
;
862 struct x25_dte_facilities dte_facilities
;
863 int len
, addr_len
, rc
;
866 * Remove the LCI and frame type.
868 skb_pull(skb
, X25_STD_MIN_LEN
);
871 * Extract the X.25 addresses and convert them to ASCII strings,
874 addr_len
= x25_addr_ntoa(skb
->data
, &source_addr
, &dest_addr
);
875 skb_pull(skb
, addr_len
);
878 * Get the length of the facilities, skip past them for the moment
879 * get the call user data because this is needed to determine
880 * the correct listener
882 len
= skb
->data
[0] + 1;
886 * Find a listener for the particular address/cud pair.
888 sk
= x25_find_listener(&source_addr
,skb
);
891 if (sk
!= NULL
&& sk_acceptq_is_full(sk
)) {
896 * We dont have any listeners for this incoming call.
900 skb_push(skb
, addr_len
+ X25_STD_MIN_LEN
);
901 if (sysctl_x25_forward
&&
902 x25_forward_call(&dest_addr
, nb
, skb
, lci
) > 0)
904 /* Call was forwarded, dont process it any more */
909 /* No listeners, can't forward, clear the call */
910 goto out_clear_request
;
915 * Try to reach a compromise on the requested facilities.
917 len
= x25_negotiate_facilities(skb
, sk
, &facilities
, &dte_facilities
);
922 * current neighbour/link might impose additional limits
923 * on certain facilties
926 x25_limit_facilities(&facilities
, nb
);
929 * Try to create a new socket.
931 make
= x25_make_new(sk
);
936 * Remove the facilities
941 make
->sk_state
= TCP_ESTABLISHED
;
943 makex25
= x25_sk(make
);
945 makex25
->dest_addr
= dest_addr
;
946 makex25
->source_addr
= source_addr
;
947 makex25
->neighbour
= nb
;
948 makex25
->facilities
= facilities
;
949 makex25
->dte_facilities
= dte_facilities
;
950 makex25
->vc_facil_mask
= x25_sk(sk
)->vc_facil_mask
;
951 /* ensure no reverse facil on accept */
952 makex25
->vc_facil_mask
&= ~X25_MASK_REVERSE
;
953 /* ensure no calling address extension on accept */
954 makex25
->vc_facil_mask
&= ~X25_MASK_CALLING_AE
;
955 makex25
->cudmatchlength
= x25_sk(sk
)->cudmatchlength
;
957 /* Normally all calls are accepted immediatly */
958 if(makex25
->accptapprv
& X25_DENY_ACCPT_APPRV
) {
959 x25_write_internal(make
, X25_CALL_ACCEPTED
);
960 makex25
->state
= X25_STATE_3
;
964 * Incoming Call User Data.
966 skb_copy_from_linear_data(skb
, makex25
->calluserdata
.cuddata
, skb
->len
);
967 makex25
->calluserdata
.cudlength
= skb
->len
;
969 sk
->sk_ack_backlog
++;
971 x25_insert_socket(make
);
973 skb_queue_head(&sk
->sk_receive_queue
, skb
);
975 x25_start_heartbeat(make
);
977 if (!sock_flag(sk
, SOCK_DEAD
))
978 sk
->sk_data_ready(sk
, skb
->len
);
987 x25_transmit_clear_request(nb
, lci
, 0x01);
991 static int x25_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
992 struct msghdr
*msg
, size_t len
)
994 struct sock
*sk
= sock
->sk
;
995 struct x25_sock
*x25
= x25_sk(sk
);
996 struct sockaddr_x25
*usx25
= (struct sockaddr_x25
*)msg
->msg_name
;
997 struct sockaddr_x25 sx25
;
999 unsigned char *asmptr
;
1000 int noblock
= msg
->msg_flags
& MSG_DONTWAIT
;
1002 int qbit
= 0, rc
= -EINVAL
;
1004 if (msg
->msg_flags
& ~(MSG_DONTWAIT
|MSG_OOB
|MSG_EOR
|MSG_CMSG_COMPAT
))
1007 /* we currently don't support segmented records at the user interface */
1008 if (!(msg
->msg_flags
& (MSG_EOR
|MSG_OOB
)))
1011 rc
= -EADDRNOTAVAIL
;
1012 if (sock_flag(sk
, SOCK_ZAPPED
))
1016 if (sk
->sk_shutdown
& SEND_SHUTDOWN
) {
1017 send_sig(SIGPIPE
, current
, 0);
1022 if (!x25
->neighbour
)
1027 if (msg
->msg_namelen
< sizeof(sx25
))
1029 memcpy(&sx25
, usx25
, sizeof(sx25
));
1031 if (strcmp(x25
->dest_addr
.x25_addr
, sx25
.sx25_addr
.x25_addr
))
1034 if (sx25
.sx25_family
!= AF_X25
)
1038 * FIXME 1003.1g - if the socket is like this because
1039 * it has become closed (not started closed) we ought
1040 * to SIGPIPE, EPIPE;
1043 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1046 sx25
.sx25_family
= AF_X25
;
1047 sx25
.sx25_addr
= x25
->dest_addr
;
1050 /* Sanity check the packet size */
1056 SOCK_DEBUG(sk
, "x25_sendmsg: sendto: Addresses built.\n");
1058 /* Build a packet */
1059 SOCK_DEBUG(sk
, "x25_sendmsg: sendto: building packet.\n");
1061 if ((msg
->msg_flags
& MSG_OOB
) && len
> 32)
1064 size
= len
+ X25_MAX_L2_LEN
+ X25_EXT_MIN_LEN
;
1066 skb
= sock_alloc_send_skb(sk
, size
, noblock
, &rc
);
1069 X25_SKB_CB(skb
)->flags
= msg
->msg_flags
;
1071 skb_reserve(skb
, X25_MAX_L2_LEN
+ X25_EXT_MIN_LEN
);
1074 * Put the data on the end
1076 SOCK_DEBUG(sk
, "x25_sendmsg: Copying user data\n");
1078 skb_reset_transport_header(skb
);
1081 rc
= memcpy_fromiovec(skb_transport_header(skb
), msg
->msg_iov
, len
);
1086 * If the Q BIT Include socket option is in force, the first
1087 * byte of the user data is the logical value of the Q Bit.
1089 if (x25
->qbitincl
) {
1090 qbit
= skb
->data
[0];
1095 * Push down the X.25 header
1097 SOCK_DEBUG(sk
, "x25_sendmsg: Building X.25 Header.\n");
1099 if (msg
->msg_flags
& MSG_OOB
) {
1100 if (x25
->neighbour
->extended
) {
1101 asmptr
= skb_push(skb
, X25_STD_MIN_LEN
);
1102 *asmptr
++ = ((x25
->lci
>> 8) & 0x0F) | X25_GFI_EXTSEQ
;
1103 *asmptr
++ = (x25
->lci
>> 0) & 0xFF;
1104 *asmptr
++ = X25_INTERRUPT
;
1106 asmptr
= skb_push(skb
, X25_STD_MIN_LEN
);
1107 *asmptr
++ = ((x25
->lci
>> 8) & 0x0F) | X25_GFI_STDSEQ
;
1108 *asmptr
++ = (x25
->lci
>> 0) & 0xFF;
1109 *asmptr
++ = X25_INTERRUPT
;
1112 if (x25
->neighbour
->extended
) {
1113 /* Build an Extended X.25 header */
1114 asmptr
= skb_push(skb
, X25_EXT_MIN_LEN
);
1115 *asmptr
++ = ((x25
->lci
>> 8) & 0x0F) | X25_GFI_EXTSEQ
;
1116 *asmptr
++ = (x25
->lci
>> 0) & 0xFF;
1117 *asmptr
++ = X25_DATA
;
1118 *asmptr
++ = X25_DATA
;
1120 /* Build an Standard X.25 header */
1121 asmptr
= skb_push(skb
, X25_STD_MIN_LEN
);
1122 *asmptr
++ = ((x25
->lci
>> 8) & 0x0F) | X25_GFI_STDSEQ
;
1123 *asmptr
++ = (x25
->lci
>> 0) & 0xFF;
1124 *asmptr
++ = X25_DATA
;
1128 skb
->data
[0] |= X25_Q_BIT
;
1131 SOCK_DEBUG(sk
, "x25_sendmsg: Built header.\n");
1132 SOCK_DEBUG(sk
, "x25_sendmsg: Transmitting buffer\n");
1135 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1138 if (msg
->msg_flags
& MSG_OOB
)
1139 skb_queue_tail(&x25
->interrupt_out_queue
, skb
);
1141 rc
= x25_output(sk
, skb
);
1145 else if (x25
->qbitincl
)
1150 * lock_sock() is currently only used to serialize this x25_kick()
1151 * against input-driven x25_kick() calls. It currently only blocks
1152 * incoming packets for this socket and does not protect against
1153 * any other socket state changes and is not called from anywhere
1154 * else. As x25_kick() cannot block and as long as all socket
1155 * operations are BKL-wrapped, we don't need take to care about
1156 * purging the backlog queue in x25_release().
1158 * Using lock_sock() to protect all socket operations entirely
1159 * (and making the whole x25 stack SMP aware) unfortunately would
1160 * require major changes to {send,recv}msg and skb allocation methods.
1175 static int x25_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
1176 struct msghdr
*msg
, size_t size
,
1179 struct sock
*sk
= sock
->sk
;
1180 struct x25_sock
*x25
= x25_sk(sk
);
1181 struct sockaddr_x25
*sx25
= (struct sockaddr_x25
*)msg
->msg_name
;
1184 struct sk_buff
*skb
;
1185 unsigned char *asmptr
;
1189 * This works for seqpacket too. The receiver has ordered the queue for
1190 * us! We do one quick check first though
1192 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1195 if (flags
& MSG_OOB
) {
1197 if (sock_flag(sk
, SOCK_URGINLINE
) ||
1198 !skb_peek(&x25
->interrupt_in_queue
))
1201 skb
= skb_dequeue(&x25
->interrupt_in_queue
);
1203 skb_pull(skb
, X25_STD_MIN_LEN
);
1206 * No Q bit information on Interrupt data.
1208 if (x25
->qbitincl
) {
1209 asmptr
= skb_push(skb
, 1);
1213 msg
->msg_flags
|= MSG_OOB
;
1215 /* Now we can treat all alike */
1216 skb
= skb_recv_datagram(sk
, flags
& ~MSG_DONTWAIT
,
1217 flags
& MSG_DONTWAIT
, &rc
);
1221 qbit
= (skb
->data
[0] & X25_Q_BIT
) == X25_Q_BIT
;
1223 skb_pull(skb
, x25
->neighbour
->extended
?
1224 X25_EXT_MIN_LEN
: X25_STD_MIN_LEN
);
1226 if (x25
->qbitincl
) {
1227 asmptr
= skb_push(skb
, 1);
1232 skb_reset_transport_header(skb
);
1235 if (copied
> size
) {
1237 msg
->msg_flags
|= MSG_TRUNC
;
1240 /* Currently, each datagram always contains a complete record */
1241 msg
->msg_flags
|= MSG_EOR
;
1243 rc
= skb_copy_datagram_iovec(skb
, 0, msg
->msg_iov
, copied
);
1245 goto out_free_dgram
;
1248 sx25
->sx25_family
= AF_X25
;
1249 sx25
->sx25_addr
= x25
->dest_addr
;
1252 msg
->msg_namelen
= sizeof(struct sockaddr_x25
);
1259 skb_free_datagram(sk
, skb
);
1265 static int x25_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
1267 struct sock
*sk
= sock
->sk
;
1268 struct x25_sock
*x25
= x25_sk(sk
);
1269 void __user
*argp
= (void __user
*)arg
;
1274 int amount
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
1278 rc
= put_user(amount
, (unsigned int __user
*)argp
);
1283 struct sk_buff
*skb
;
1286 * These two are safe on a single CPU system as
1287 * only user tasks fiddle here
1289 if ((skb
= skb_peek(&sk
->sk_receive_queue
)) != NULL
)
1291 rc
= put_user(amount
, (unsigned int __user
*)argp
);
1298 rc
= sock_get_timestamp(sk
,
1299 (struct timeval __user
*)argp
);
1304 rc
= sock_get_timestampns(sk
,
1305 (struct timespec __user
*)argp
);
1309 case SIOCGIFDSTADDR
:
1310 case SIOCSIFDSTADDR
:
1311 case SIOCGIFBRDADDR
:
1312 case SIOCSIFBRDADDR
:
1313 case SIOCGIFNETMASK
:
1314 case SIOCSIFNETMASK
:
1322 if (!capable(CAP_NET_ADMIN
))
1324 rc
= x25_route_ioctl(cmd
, argp
);
1326 case SIOCX25GSUBSCRIP
:
1327 rc
= x25_subscr_ioctl(cmd
, argp
);
1329 case SIOCX25SSUBSCRIP
:
1331 if (!capable(CAP_NET_ADMIN
))
1333 rc
= x25_subscr_ioctl(cmd
, argp
);
1335 case SIOCX25GFACILITIES
: {
1336 struct x25_facilities fac
= x25
->facilities
;
1337 rc
= copy_to_user(argp
, &fac
,
1338 sizeof(fac
)) ? -EFAULT
: 0;
1342 case SIOCX25SFACILITIES
: {
1343 struct x25_facilities facilities
;
1345 if (copy_from_user(&facilities
, argp
,
1346 sizeof(facilities
)))
1349 if (sk
->sk_state
!= TCP_LISTEN
&&
1350 sk
->sk_state
!= TCP_CLOSE
)
1352 if (facilities
.pacsize_in
< X25_PS16
||
1353 facilities
.pacsize_in
> X25_PS4096
)
1355 if (facilities
.pacsize_out
< X25_PS16
||
1356 facilities
.pacsize_out
> X25_PS4096
)
1358 if (facilities
.winsize_in
< 1 ||
1359 facilities
.winsize_in
> 127)
1361 if (facilities
.throughput
< 0x03 ||
1362 facilities
.throughput
> 0xDD)
1364 if (facilities
.reverse
&&
1365 (facilities
.reverse
| 0x81)!= 0x81)
1367 x25
->facilities
= facilities
;
1372 case SIOCX25GDTEFACILITIES
: {
1373 rc
= copy_to_user(argp
, &x25
->dte_facilities
,
1374 sizeof(x25
->dte_facilities
));
1380 case SIOCX25SDTEFACILITIES
: {
1381 struct x25_dte_facilities dtefacs
;
1383 if (copy_from_user(&dtefacs
, argp
, sizeof(dtefacs
)))
1386 if (sk
->sk_state
!= TCP_LISTEN
&&
1387 sk
->sk_state
!= TCP_CLOSE
)
1389 if (dtefacs
.calling_len
> X25_MAX_AE_LEN
)
1391 if (dtefacs
.calling_ae
== NULL
)
1393 if (dtefacs
.called_len
> X25_MAX_AE_LEN
)
1395 if (dtefacs
.called_ae
== NULL
)
1397 x25
->dte_facilities
= dtefacs
;
1402 case SIOCX25GCALLUSERDATA
: {
1403 struct x25_calluserdata cud
= x25
->calluserdata
;
1404 rc
= copy_to_user(argp
, &cud
,
1405 sizeof(cud
)) ? -EFAULT
: 0;
1409 case SIOCX25SCALLUSERDATA
: {
1410 struct x25_calluserdata calluserdata
;
1413 if (copy_from_user(&calluserdata
, argp
,
1414 sizeof(calluserdata
)))
1417 if (calluserdata
.cudlength
> X25_MAX_CUD_LEN
)
1419 x25
->calluserdata
= calluserdata
;
1424 case SIOCX25GCAUSEDIAG
: {
1425 struct x25_causediag causediag
;
1426 causediag
= x25
->causediag
;
1427 rc
= copy_to_user(argp
, &causediag
,
1428 sizeof(causediag
)) ? -EFAULT
: 0;
1432 case SIOCX25SCUDMATCHLEN
: {
1433 struct x25_subaddr sub_addr
;
1435 if(sk
->sk_state
!= TCP_CLOSE
)
1438 if (copy_from_user(&sub_addr
, argp
,
1442 if(sub_addr
.cudmatchlength
> X25_MAX_CUD_LEN
)
1444 x25
->cudmatchlength
= sub_addr
.cudmatchlength
;
1449 case SIOCX25CALLACCPTAPPRV
: {
1451 if (sk
->sk_state
!= TCP_CLOSE
)
1453 x25
->accptapprv
= X25_ALLOW_ACCPT_APPRV
;
1458 case SIOCX25SENDCALLACCPT
: {
1460 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1462 if (x25
->accptapprv
) /* must call accptapprv above */
1464 x25_write_internal(sk
, X25_CALL_ACCEPTED
);
1465 x25
->state
= X25_STATE_3
;
1478 static struct net_proto_family x25_family_ops
= {
1480 .create
= x25_create
,
1481 .owner
= THIS_MODULE
,
1484 #ifdef CONFIG_COMPAT
1485 static int compat_x25_subscr_ioctl(unsigned int cmd
,
1486 struct compat_x25_subscrip_struct __user
*x25_subscr32
)
1488 struct compat_x25_subscrip_struct x25_subscr
;
1489 struct x25_neigh
*nb
;
1490 struct net_device
*dev
;
1494 if (copy_from_user(&x25_subscr
, x25_subscr32
, sizeof(*x25_subscr32
)))
1498 dev
= x25_dev_get(x25_subscr
.device
);
1502 nb
= x25_get_neigh(dev
);
1508 if (cmd
== SIOCX25GSUBSCRIP
) {
1509 x25_subscr
.extended
= nb
->extended
;
1510 x25_subscr
.global_facil_mask
= nb
->global_facil_mask
;
1511 rc
= copy_to_user(x25_subscr32
, &x25_subscr
,
1512 sizeof(*x25_subscr32
)) ? -EFAULT
: 0;
1515 if (x25_subscr
.extended
== 0 || x25_subscr
.extended
== 1) {
1517 nb
->extended
= x25_subscr
.extended
;
1518 nb
->global_facil_mask
= x25_subscr
.global_facil_mask
;
1529 static int compat_x25_ioctl(struct socket
*sock
, unsigned int cmd
,
1532 void __user
*argp
= compat_ptr(arg
);
1533 struct sock
*sk
= sock
->sk
;
1535 int rc
= -ENOIOCTLCMD
;
1540 rc
= x25_ioctl(sock
, cmd
, (unsigned long)argp
);
1545 rc
= compat_sock_get_timestamp(sk
,
1546 (struct timeval __user
*)argp
);
1551 rc
= compat_sock_get_timestampns(sk
,
1552 (struct timespec __user
*)argp
);
1556 case SIOCGIFDSTADDR
:
1557 case SIOCSIFDSTADDR
:
1558 case SIOCGIFBRDADDR
:
1559 case SIOCSIFBRDADDR
:
1560 case SIOCGIFNETMASK
:
1561 case SIOCSIFNETMASK
:
1569 if (!capable(CAP_NET_ADMIN
))
1571 rc
= x25_route_ioctl(cmd
, argp
);
1573 case SIOCX25GSUBSCRIP
:
1574 rc
= compat_x25_subscr_ioctl(cmd
, argp
);
1576 case SIOCX25SSUBSCRIP
:
1578 if (!capable(CAP_NET_ADMIN
))
1580 rc
= compat_x25_subscr_ioctl(cmd
, argp
);
1582 case SIOCX25GFACILITIES
:
1583 case SIOCX25SFACILITIES
:
1584 case SIOCX25GDTEFACILITIES
:
1585 case SIOCX25SDTEFACILITIES
:
1586 case SIOCX25GCALLUSERDATA
:
1587 case SIOCX25SCALLUSERDATA
:
1588 case SIOCX25GCAUSEDIAG
:
1589 case SIOCX25SCUDMATCHLEN
:
1590 case SIOCX25CALLACCPTAPPRV
:
1591 case SIOCX25SENDCALLACCPT
:
1592 rc
= x25_ioctl(sock
, cmd
, (unsigned long)argp
);
1602 static const struct proto_ops
SOCKOPS_WRAPPED(x25_proto_ops
) = {
1604 .owner
= THIS_MODULE
,
1605 .release
= x25_release
,
1607 .connect
= x25_connect
,
1608 .socketpair
= sock_no_socketpair
,
1609 .accept
= x25_accept
,
1610 .getname
= x25_getname
,
1611 .poll
= datagram_poll
,
1613 #ifdef CONFIG_COMPAT
1614 .compat_ioctl
= compat_x25_ioctl
,
1616 .listen
= x25_listen
,
1617 .shutdown
= sock_no_shutdown
,
1618 .setsockopt
= x25_setsockopt
,
1619 .getsockopt
= x25_getsockopt
,
1620 .sendmsg
= x25_sendmsg
,
1621 .recvmsg
= x25_recvmsg
,
1622 .mmap
= sock_no_mmap
,
1623 .sendpage
= sock_no_sendpage
,
1626 SOCKOPS_WRAP(x25_proto
, AF_X25
);
1628 static struct packet_type x25_packet_type __read_mostly
= {
1629 .type
= cpu_to_be16(ETH_P_X25
),
1630 .func
= x25_lapb_receive_frame
,
1633 static struct notifier_block x25_dev_notifier
= {
1634 .notifier_call
= x25_device_event
,
1637 void x25_kill_by_neigh(struct x25_neigh
*nb
)
1640 struct hlist_node
*node
;
1642 write_lock_bh(&x25_list_lock
);
1644 sk_for_each(s
, node
, &x25_list
)
1645 if (x25_sk(s
)->neighbour
== nb
)
1646 x25_disconnect(s
, ENETUNREACH
, 0, 0);
1648 write_unlock_bh(&x25_list_lock
);
1650 /* Remove any related forwards */
1651 x25_clear_forward_by_dev(nb
->dev
);
1654 static int __init
x25_init(void)
1656 int rc
= proto_register(&x25_proto
, 0);
1661 sock_register(&x25_family_ops
);
1663 dev_add_pack(&x25_packet_type
);
1665 register_netdevice_notifier(&x25_dev_notifier
);
1667 printk(KERN_INFO
"X.25 for Linux Version 0.2\n");
1669 #ifdef CONFIG_SYSCTL
1670 x25_register_sysctl();
1676 module_init(x25_init
);
1678 static void __exit
x25_exit(void)
1684 #ifdef CONFIG_SYSCTL
1685 x25_unregister_sysctl();
1688 unregister_netdevice_notifier(&x25_dev_notifier
);
1690 dev_remove_pack(&x25_packet_type
);
1692 sock_unregister(AF_X25
);
1693 proto_unregister(&x25_proto
);
1695 module_exit(x25_exit
);
1697 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1698 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1699 MODULE_LICENSE("GPL");
1700 MODULE_ALIAS_NETPROTO(PF_X25
);