1 /* 2 * X.25 Packet Layer release 002 3 * 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. 7 * 8 * This code REQUIRES 2.1.15 or higher 9 * 10 * This module: 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. 15 * 16 * History 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 33 * with call user data 34 * 2005-04-15 Shaun Pereira Fast select with no restriction on 35 * response 36 */ 37 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> 49 #include <net/sock.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> 57 58 #include <net/x25.h> 59 #include <net/compat.h> 60 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; 67 68 HLIST_HEAD(x25_list); 69 DEFINE_RWLOCK(x25_list_lock); 70 71 static const struct proto_ops x25_proto_ops; 72 73 static struct x25_address null_x25_address = {" "}; 74 75 #ifdef CONFIG_COMPAT 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; 80 }; 81 #endif 82 83 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 84 struct x25_address *calling_addr) 85 { 86 int called_len, calling_len; 87 char *called, *calling; 88 int i; 89 90 called_len = (*p >> 0) & 0x0F; 91 calling_len = (*p >> 4) & 0x0F; 92 93 called = called_addr->x25_addr; 94 calling = calling_addr->x25_addr; 95 p++; 96 97 for (i = 0; i < (called_len + calling_len); i++) { 98 if (i < called_len) { 99 if (i % 2 != 0) { 100 *called++ = ((*p >> 0) & 0x0F) + '0'; 101 p++; 102 } else { 103 *called++ = ((*p >> 4) & 0x0F) + '0'; 104 } 105 } else { 106 if (i % 2 != 0) { 107 *calling++ = ((*p >> 0) & 0x0F) + '0'; 108 p++; 109 } else { 110 *calling++ = ((*p >> 4) & 0x0F) + '0'; 111 } 112 } 113 } 114 115 *called = *calling = '\0'; 116 117 return 1 + (called_len + calling_len + 1) / 2; 118 } 119 120 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 121 struct x25_address *calling_addr) 122 { 123 unsigned int called_len, calling_len; 124 char *called, *calling; 125 int i; 126 127 called = called_addr->x25_addr; 128 calling = calling_addr->x25_addr; 129 130 called_len = strlen(called); 131 calling_len = strlen(calling); 132 133 *p++ = (calling_len << 4) | (called_len << 0); 134 135 for (i = 0; i < (called_len + calling_len); i++) { 136 if (i < called_len) { 137 if (i % 2 != 0) { 138 *p |= (*called++ - '0') << 0; 139 p++; 140 } else { 141 *p = 0x00; 142 *p |= (*called++ - '0') << 4; 143 } 144 } else { 145 if (i % 2 != 0) { 146 *p |= (*calling++ - '0') << 0; 147 p++; 148 } else { 149 *p = 0x00; 150 *p |= (*calling++ - '0') << 4; 151 } 152 } 153 } 154 155 return 1 + (called_len + calling_len + 1) / 2; 156 } 157 158 /* 159 * Socket removal during an interrupt is now safe. 160 */ 161 static void x25_remove_socket(struct sock *sk) 162 { 163 write_lock_bh(&x25_list_lock); 164 sk_del_node_init(sk); 165 write_unlock_bh(&x25_list_lock); 166 } 167 168 /* 169 * Kill all bound sockets on a dropped device. 170 */ 171 static void x25_kill_by_device(struct net_device *dev) 172 { 173 struct sock *s; 174 struct hlist_node *node; 175 176 write_lock_bh(&x25_list_lock); 177 178 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); 181 182 write_unlock_bh(&x25_list_lock); 183 } 184 185 /* 186 * Handle device status changes. 187 */ 188 static int x25_device_event(struct notifier_block *this, unsigned long event, 189 void *ptr) 190 { 191 struct net_device *dev = ptr; 192 struct x25_neigh *nb; 193 194 if (dev->nd_net != &init_net) 195 return NOTIFY_DONE; 196 197 if (dev->type == ARPHRD_X25 198 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE) 199 || dev->type == ARPHRD_ETHER 200 #endif 201 ) { 202 switch (event) { 203 case NETDEV_UP: 204 x25_link_device_up(dev); 205 break; 206 case NETDEV_GOING_DOWN: 207 nb = x25_get_neigh(dev); 208 if (nb) { 209 x25_terminate_link(nb); 210 x25_neigh_put(nb); 211 } 212 break; 213 case NETDEV_DOWN: 214 x25_kill_by_device(dev); 215 x25_route_device_down(dev); 216 x25_link_device_down(dev); 217 break; 218 } 219 } 220 221 return NOTIFY_DONE; 222 } 223 224 /* 225 * Add a socket to the bound sockets list. 226 */ 227 static void x25_insert_socket(struct sock *sk) 228 { 229 write_lock_bh(&x25_list_lock); 230 sk_add_node(sk, &x25_list); 231 write_unlock_bh(&x25_list_lock); 232 } 233 234 /* 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 239 * with matching cud. 240 */ 241 static struct sock *x25_find_listener(struct x25_address *addr, 242 struct sk_buff *skb) 243 { 244 struct sock *s; 245 struct sock *next_best; 246 struct hlist_node *node; 247 248 read_lock_bh(&x25_list_lock); 249 next_best = NULL; 250 251 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) { 257 /* 258 * Found a listening socket, now check the incoming 259 * call user data vs this sockets call user data 260 */ 261 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { 262 if((memcmp(x25_sk(s)->calluserdata.cuddata, 263 skb->data, 264 x25_sk(s)->cudmatchlength)) == 0) { 265 sock_hold(s); 266 goto found; 267 } 268 } else 269 next_best = s; 270 } 271 if (next_best) { 272 s = next_best; 273 sock_hold(s); 274 goto found; 275 } 276 s = NULL; 277 found: 278 read_unlock_bh(&x25_list_lock); 279 return s; 280 } 281 282 /* 283 * Find a connected X.25 socket given my LCI and neighbour. 284 */ 285 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 286 { 287 struct sock *s; 288 struct hlist_node *node; 289 290 sk_for_each(s, node, &x25_list) 291 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 292 sock_hold(s); 293 goto found; 294 } 295 s = NULL; 296 found: 297 return s; 298 } 299 300 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 301 { 302 struct sock *s; 303 304 read_lock_bh(&x25_list_lock); 305 s = __x25_find_socket(lci, nb); 306 read_unlock_bh(&x25_list_lock); 307 return s; 308 } 309 310 /* 311 * Find a unique LCI for a given device. 312 */ 313 static unsigned int x25_new_lci(struct x25_neigh *nb) 314 { 315 unsigned int lci = 1; 316 struct sock *sk; 317 318 read_lock_bh(&x25_list_lock); 319 320 while ((sk = __x25_find_socket(lci, nb)) != NULL) { 321 sock_put(sk); 322 if (++lci == 4096) { 323 lci = 0; 324 break; 325 } 326 } 327 328 read_unlock_bh(&x25_list_lock); 329 return lci; 330 } 331 332 /* 333 * Deferred destroy. 334 */ 335 void x25_destroy_socket(struct sock *); 336 337 /* 338 * handler for deferred kills. 339 */ 340 static void x25_destroy_timer(unsigned long data) 341 { 342 x25_destroy_socket((struct sock *)data); 343 } 344 345 /* 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 351 */ 352 void x25_destroy_socket(struct sock *sk) 353 { 354 struct sk_buff *skb; 355 356 sock_hold(sk); 357 lock_sock(sk); 358 x25_stop_heartbeat(sk); 359 x25_stop_timer(sk); 360 361 x25_remove_socket(sk); 362 x25_clear_queues(sk); /* Flush the queues */ 363 364 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 365 if (skb->sk != sk) { /* A pending connection */ 366 /* 367 * Queue the unaccepted socket for death 368 */ 369 sock_set_flag(skb->sk, SOCK_DEAD); 370 x25_start_heartbeat(skb->sk); 371 x25_sk(skb->sk)->state = X25_STATE_0; 372 } 373 374 kfree_skb(skb); 375 } 376 377 if (atomic_read(&sk->sk_wmem_alloc) || 378 atomic_read(&sk->sk_rmem_alloc)) { 379 /* Defer: outstanding buffers */ 380 sk->sk_timer.expires = jiffies + 10 * HZ; 381 sk->sk_timer.function = x25_destroy_timer; 382 sk->sk_timer.data = (unsigned long)sk; 383 add_timer(&sk->sk_timer); 384 } else { 385 /* drop last reference so sock_put will free */ 386 __sock_put(sk); 387 } 388 389 release_sock(sk); 390 sock_put(sk); 391 } 392 393 /* 394 * Handling for system calls applied via the various interfaces to a 395 * X.25 socket object. 396 */ 397 398 static int x25_setsockopt(struct socket *sock, int level, int optname, 399 char __user *optval, int optlen) 400 { 401 int opt; 402 struct sock *sk = sock->sk; 403 int rc = -ENOPROTOOPT; 404 405 if (level != SOL_X25 || optname != X25_QBITINCL) 406 goto out; 407 408 rc = -EINVAL; 409 if (optlen < sizeof(int)) 410 goto out; 411 412 rc = -EFAULT; 413 if (get_user(opt, (int __user *)optval)) 414 goto out; 415 416 x25_sk(sk)->qbitincl = !!opt; 417 rc = 0; 418 out: 419 return rc; 420 } 421 422 static int x25_getsockopt(struct socket *sock, int level, int optname, 423 char __user *optval, int __user *optlen) 424 { 425 struct sock *sk = sock->sk; 426 int val, len, rc = -ENOPROTOOPT; 427 428 if (level != SOL_X25 || optname != X25_QBITINCL) 429 goto out; 430 431 rc = -EFAULT; 432 if (get_user(len, optlen)) 433 goto out; 434 435 len = min_t(unsigned int, len, sizeof(int)); 436 437 rc = -EINVAL; 438 if (len < 0) 439 goto out; 440 441 rc = -EFAULT; 442 if (put_user(len, optlen)) 443 goto out; 444 445 val = x25_sk(sk)->qbitincl; 446 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 447 out: 448 return rc; 449 } 450 451 static int x25_listen(struct socket *sock, int backlog) 452 { 453 struct sock *sk = sock->sk; 454 int rc = -EOPNOTSUPP; 455 456 if (sk->sk_state != TCP_LISTEN) { 457 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 458 sk->sk_max_ack_backlog = backlog; 459 sk->sk_state = TCP_LISTEN; 460 rc = 0; 461 } 462 463 return rc; 464 } 465 466 static struct proto x25_proto = { 467 .name = "X25", 468 .owner = THIS_MODULE, 469 .obj_size = sizeof(struct x25_sock), 470 }; 471 472 static struct sock *x25_alloc_socket(struct net *net) 473 { 474 struct x25_sock *x25; 475 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, 1); 476 477 if (!sk) 478 goto out; 479 480 sock_init_data(NULL, sk); 481 482 x25 = x25_sk(sk); 483 skb_queue_head_init(&x25->ack_queue); 484 skb_queue_head_init(&x25->fragment_queue); 485 skb_queue_head_init(&x25->interrupt_in_queue); 486 skb_queue_head_init(&x25->interrupt_out_queue); 487 out: 488 return sk; 489 } 490 491 static int x25_create(struct net *net, struct socket *sock, int protocol) 492 { 493 struct sock *sk; 494 struct x25_sock *x25; 495 int rc = -ESOCKTNOSUPPORT; 496 497 if (net != &init_net) 498 return -EAFNOSUPPORT; 499 500 if (sock->type != SOCK_SEQPACKET || protocol) 501 goto out; 502 503 rc = -ENOMEM; 504 if ((sk = x25_alloc_socket(net)) == NULL) 505 goto out; 506 507 x25 = x25_sk(sk); 508 509 sock_init_data(sock, sk); 510 511 x25_init_timers(sk); 512 513 sock->ops = &x25_proto_ops; 514 sk->sk_protocol = protocol; 515 sk->sk_backlog_rcv = x25_backlog_rcv; 516 517 x25->t21 = sysctl_x25_call_request_timeout; 518 x25->t22 = sysctl_x25_reset_request_timeout; 519 x25->t23 = sysctl_x25_clear_request_timeout; 520 x25->t2 = sysctl_x25_ack_holdback_timeout; 521 x25->state = X25_STATE_0; 522 x25->cudmatchlength = 0; 523 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */ 524 /* on call accept */ 525 526 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 527 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 528 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 529 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 530 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT; 531 x25->facilities.reverse = X25_DEFAULT_REVERSE; 532 x25->dte_facilities.calling_len = 0; 533 x25->dte_facilities.called_len = 0; 534 memset(x25->dte_facilities.called_ae, '\0', 535 sizeof(x25->dte_facilities.called_ae)); 536 memset(x25->dte_facilities.calling_ae, '\0', 537 sizeof(x25->dte_facilities.calling_ae)); 538 539 rc = 0; 540 out: 541 return rc; 542 } 543 544 static struct sock *x25_make_new(struct sock *osk) 545 { 546 struct sock *sk = NULL; 547 struct x25_sock *x25, *ox25; 548 549 if (osk->sk_type != SOCK_SEQPACKET) 550 goto out; 551 552 if ((sk = x25_alloc_socket(osk->sk_net)) == NULL) 553 goto out; 554 555 x25 = x25_sk(sk); 556 557 sk->sk_type = osk->sk_type; 558 sk->sk_socket = osk->sk_socket; 559 sk->sk_priority = osk->sk_priority; 560 sk->sk_protocol = osk->sk_protocol; 561 sk->sk_rcvbuf = osk->sk_rcvbuf; 562 sk->sk_sndbuf = osk->sk_sndbuf; 563 sk->sk_state = TCP_ESTABLISHED; 564 sk->sk_sleep = osk->sk_sleep; 565 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 566 sock_copy_flags(sk, osk); 567 568 ox25 = x25_sk(osk); 569 x25->t21 = ox25->t21; 570 x25->t22 = ox25->t22; 571 x25->t23 = ox25->t23; 572 x25->t2 = ox25->t2; 573 x25->facilities = ox25->facilities; 574 x25->qbitincl = ox25->qbitincl; 575 x25->dte_facilities = ox25->dte_facilities; 576 x25->cudmatchlength = ox25->cudmatchlength; 577 x25->accptapprv = ox25->accptapprv; 578 579 x25_init_timers(sk); 580 out: 581 return sk; 582 } 583 584 static int x25_release(struct socket *sock) 585 { 586 struct sock *sk = sock->sk; 587 struct x25_sock *x25; 588 589 if (!sk) 590 goto out; 591 592 x25 = x25_sk(sk); 593 594 switch (x25->state) { 595 596 case X25_STATE_0: 597 case X25_STATE_2: 598 x25_disconnect(sk, 0, 0, 0); 599 x25_destroy_socket(sk); 600 goto out; 601 602 case X25_STATE_1: 603 case X25_STATE_3: 604 case X25_STATE_4: 605 x25_clear_queues(sk); 606 x25_write_internal(sk, X25_CLEAR_REQUEST); 607 x25_start_t23timer(sk); 608 x25->state = X25_STATE_2; 609 sk->sk_state = TCP_CLOSE; 610 sk->sk_shutdown |= SEND_SHUTDOWN; 611 sk->sk_state_change(sk); 612 sock_set_flag(sk, SOCK_DEAD); 613 sock_set_flag(sk, SOCK_DESTROY); 614 break; 615 } 616 617 sock->sk = NULL; 618 sk->sk_socket = NULL; /* Not used, but we should do this */ 619 out: 620 return 0; 621 } 622 623 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 624 { 625 struct sock *sk = sock->sk; 626 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 627 628 if (!sock_flag(sk, SOCK_ZAPPED) || 629 addr_len != sizeof(struct sockaddr_x25) || 630 addr->sx25_family != AF_X25) 631 return -EINVAL; 632 633 x25_sk(sk)->source_addr = addr->sx25_addr; 634 x25_insert_socket(sk); 635 sock_reset_flag(sk, SOCK_ZAPPED); 636 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 637 638 return 0; 639 } 640 641 static int x25_wait_for_connection_establishment(struct sock *sk) 642 { 643 DECLARE_WAITQUEUE(wait, current); 644 int rc; 645 646 add_wait_queue_exclusive(sk->sk_sleep, &wait); 647 for (;;) { 648 __set_current_state(TASK_INTERRUPTIBLE); 649 rc = -ERESTARTSYS; 650 if (signal_pending(current)) 651 break; 652 rc = sock_error(sk); 653 if (rc) { 654 sk->sk_socket->state = SS_UNCONNECTED; 655 break; 656 } 657 rc = 0; 658 if (sk->sk_state != TCP_ESTABLISHED) { 659 release_sock(sk); 660 schedule(); 661 lock_sock(sk); 662 } else 663 break; 664 } 665 __set_current_state(TASK_RUNNING); 666 remove_wait_queue(sk->sk_sleep, &wait); 667 return rc; 668 } 669 670 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 671 int addr_len, int flags) 672 { 673 struct sock *sk = sock->sk; 674 struct x25_sock *x25 = x25_sk(sk); 675 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 676 struct x25_route *rt; 677 int rc = 0; 678 679 lock_sock(sk); 680 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 681 sock->state = SS_CONNECTED; 682 goto out; /* Connect completed during a ERESTARTSYS event */ 683 } 684 685 rc = -ECONNREFUSED; 686 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 687 sock->state = SS_UNCONNECTED; 688 goto out; 689 } 690 691 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 692 if (sk->sk_state == TCP_ESTABLISHED) 693 goto out; 694 695 sk->sk_state = TCP_CLOSE; 696 sock->state = SS_UNCONNECTED; 697 698 rc = -EINVAL; 699 if (addr_len != sizeof(struct sockaddr_x25) || 700 addr->sx25_family != AF_X25) 701 goto out; 702 703 rc = -ENETUNREACH; 704 rt = x25_get_route(&addr->sx25_addr); 705 if (!rt) 706 goto out; 707 708 x25->neighbour = x25_get_neigh(rt->dev); 709 if (!x25->neighbour) 710 goto out_put_route; 711 712 x25_limit_facilities(&x25->facilities, x25->neighbour); 713 714 x25->lci = x25_new_lci(x25->neighbour); 715 if (!x25->lci) 716 goto out_put_neigh; 717 718 rc = -EINVAL; 719 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 720 goto out_put_neigh; 721 722 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 723 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 724 725 x25->dest_addr = addr->sx25_addr; 726 727 /* Move to connecting socket, start sending Connect Requests */ 728 sock->state = SS_CONNECTING; 729 sk->sk_state = TCP_SYN_SENT; 730 731 x25->state = X25_STATE_1; 732 733 x25_write_internal(sk, X25_CALL_REQUEST); 734 735 x25_start_heartbeat(sk); 736 x25_start_t21timer(sk); 737 738 /* Now the loop */ 739 rc = -EINPROGRESS; 740 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 741 goto out_put_neigh; 742 743 rc = x25_wait_for_connection_establishment(sk); 744 if (rc) 745 goto out_put_neigh; 746 747 sock->state = SS_CONNECTED; 748 rc = 0; 749 out_put_neigh: 750 if (rc) 751 x25_neigh_put(x25->neighbour); 752 out_put_route: 753 x25_route_put(rt); 754 out: 755 release_sock(sk); 756 return rc; 757 } 758 759 static int x25_wait_for_data(struct sock *sk, long timeout) 760 { 761 DECLARE_WAITQUEUE(wait, current); 762 int rc = 0; 763 764 add_wait_queue_exclusive(sk->sk_sleep, &wait); 765 for (;;) { 766 __set_current_state(TASK_INTERRUPTIBLE); 767 if (sk->sk_shutdown & RCV_SHUTDOWN) 768 break; 769 rc = -ERESTARTSYS; 770 if (signal_pending(current)) 771 break; 772 rc = -EAGAIN; 773 if (!timeout) 774 break; 775 rc = 0; 776 if (skb_queue_empty(&sk->sk_receive_queue)) { 777 release_sock(sk); 778 timeout = schedule_timeout(timeout); 779 lock_sock(sk); 780 } else 781 break; 782 } 783 __set_current_state(TASK_RUNNING); 784 remove_wait_queue(sk->sk_sleep, &wait); 785 return rc; 786 } 787 788 static int x25_accept(struct socket *sock, struct socket *newsock, int flags) 789 { 790 struct sock *sk = sock->sk; 791 struct sock *newsk; 792 struct sk_buff *skb; 793 int rc = -EINVAL; 794 795 if (!sk || sk->sk_state != TCP_LISTEN) 796 goto out; 797 798 rc = -EOPNOTSUPP; 799 if (sk->sk_type != SOCK_SEQPACKET) 800 goto out; 801 802 lock_sock(sk); 803 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 804 if (rc) 805 goto out2; 806 skb = skb_dequeue(&sk->sk_receive_queue); 807 rc = -EINVAL; 808 if (!skb->sk) 809 goto out2; 810 newsk = skb->sk; 811 newsk->sk_socket = newsock; 812 newsk->sk_sleep = &newsock->wait; 813 814 /* Now attach up the new socket */ 815 skb->sk = NULL; 816 kfree_skb(skb); 817 sk->sk_ack_backlog--; 818 newsock->sk = newsk; 819 newsock->state = SS_CONNECTED; 820 rc = 0; 821 out2: 822 release_sock(sk); 823 out: 824 return rc; 825 } 826 827 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 828 int *uaddr_len, int peer) 829 { 830 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 831 struct sock *sk = sock->sk; 832 struct x25_sock *x25 = x25_sk(sk); 833 834 if (peer) { 835 if (sk->sk_state != TCP_ESTABLISHED) 836 return -ENOTCONN; 837 sx25->sx25_addr = x25->dest_addr; 838 } else 839 sx25->sx25_addr = x25->source_addr; 840 841 sx25->sx25_family = AF_X25; 842 *uaddr_len = sizeof(*sx25); 843 844 return 0; 845 } 846 847 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 848 unsigned int lci) 849 { 850 struct sock *sk; 851 struct sock *make; 852 struct x25_sock *makex25; 853 struct x25_address source_addr, dest_addr; 854 struct x25_facilities facilities; 855 struct x25_dte_facilities dte_facilities; 856 int len, addr_len, rc; 857 858 /* 859 * Remove the LCI and frame type. 860 */ 861 skb_pull(skb, X25_STD_MIN_LEN); 862 863 /* 864 * Extract the X.25 addresses and convert them to ASCII strings, 865 * and remove them. 866 */ 867 addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr); 868 skb_pull(skb, addr_len); 869 870 /* 871 * Get the length of the facilities, skip past them for the moment 872 * get the call user data because this is needed to determine 873 * the correct listener 874 */ 875 len = skb->data[0] + 1; 876 skb_pull(skb,len); 877 878 /* 879 * Find a listener for the particular address/cud pair. 880 */ 881 sk = x25_find_listener(&source_addr,skb); 882 skb_push(skb,len); 883 884 if (sk != NULL && sk_acceptq_is_full(sk)) { 885 goto out_sock_put; 886 } 887 888 /* 889 * We dont have any listeners for this incoming call. 890 * Try forwarding it. 891 */ 892 if (sk == NULL) { 893 skb_push(skb, addr_len + X25_STD_MIN_LEN); 894 if (sysctl_x25_forward && 895 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 896 { 897 /* Call was forwarded, dont process it any more */ 898 kfree_skb(skb); 899 rc = 1; 900 goto out; 901 } else { 902 /* No listeners, can't forward, clear the call */ 903 goto out_clear_request; 904 } 905 } 906 907 /* 908 * Try to reach a compromise on the requested facilities. 909 */ 910 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 911 if (len == -1) 912 goto out_sock_put; 913 914 /* 915 * current neighbour/link might impose additional limits 916 * on certain facilties 917 */ 918 919 x25_limit_facilities(&facilities, nb); 920 921 /* 922 * Try to create a new socket. 923 */ 924 make = x25_make_new(sk); 925 if (!make) 926 goto out_sock_put; 927 928 /* 929 * Remove the facilities 930 */ 931 skb_pull(skb, len); 932 933 skb->sk = make; 934 make->sk_state = TCP_ESTABLISHED; 935 936 makex25 = x25_sk(make); 937 makex25->lci = lci; 938 makex25->dest_addr = dest_addr; 939 makex25->source_addr = source_addr; 940 makex25->neighbour = nb; 941 makex25->facilities = facilities; 942 makex25->dte_facilities= dte_facilities; 943 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 944 /* ensure no reverse facil on accept */ 945 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 946 /* ensure no calling address extension on accept */ 947 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 948 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 949 950 /* Normally all calls are accepted immediatly */ 951 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) { 952 x25_write_internal(make, X25_CALL_ACCEPTED); 953 makex25->state = X25_STATE_3; 954 } 955 956 /* 957 * Incoming Call User Data. 958 */ 959 if (skb->len >= 0) { 960 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 961 makex25->calluserdata.cudlength = skb->len; 962 } 963 964 sk->sk_ack_backlog++; 965 966 x25_insert_socket(make); 967 968 skb_queue_head(&sk->sk_receive_queue, skb); 969 970 x25_start_heartbeat(make); 971 972 if (!sock_flag(sk, SOCK_DEAD)) 973 sk->sk_data_ready(sk, skb->len); 974 rc = 1; 975 sock_put(sk); 976 out: 977 return rc; 978 out_sock_put: 979 sock_put(sk); 980 out_clear_request: 981 rc = 0; 982 x25_transmit_clear_request(nb, lci, 0x01); 983 goto out; 984 } 985 986 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, 987 struct msghdr *msg, size_t len) 988 { 989 struct sock *sk = sock->sk; 990 struct x25_sock *x25 = x25_sk(sk); 991 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name; 992 struct sockaddr_x25 sx25; 993 struct sk_buff *skb; 994 unsigned char *asmptr; 995 int noblock = msg->msg_flags & MSG_DONTWAIT; 996 size_t size; 997 int qbit = 0, rc = -EINVAL; 998 999 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1000 goto out; 1001 1002 /* we currently don't support segmented records at the user interface */ 1003 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1004 goto out; 1005 1006 rc = -EADDRNOTAVAIL; 1007 if (sock_flag(sk, SOCK_ZAPPED)) 1008 goto out; 1009 1010 rc = -EPIPE; 1011 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1012 send_sig(SIGPIPE, current, 0); 1013 goto out; 1014 } 1015 1016 rc = -ENETUNREACH; 1017 if (!x25->neighbour) 1018 goto out; 1019 1020 if (usx25) { 1021 rc = -EINVAL; 1022 if (msg->msg_namelen < sizeof(sx25)) 1023 goto out; 1024 memcpy(&sx25, usx25, sizeof(sx25)); 1025 rc = -EISCONN; 1026 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1027 goto out; 1028 rc = -EINVAL; 1029 if (sx25.sx25_family != AF_X25) 1030 goto out; 1031 } else { 1032 /* 1033 * FIXME 1003.1g - if the socket is like this because 1034 * it has become closed (not started closed) we ought 1035 * to SIGPIPE, EPIPE; 1036 */ 1037 rc = -ENOTCONN; 1038 if (sk->sk_state != TCP_ESTABLISHED) 1039 goto out; 1040 1041 sx25.sx25_family = AF_X25; 1042 sx25.sx25_addr = x25->dest_addr; 1043 } 1044 1045 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1046 1047 /* Build a packet */ 1048 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1049 1050 if ((msg->msg_flags & MSG_OOB) && len > 32) 1051 len = 32; 1052 1053 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1054 1055 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1056 if (!skb) 1057 goto out; 1058 X25_SKB_CB(skb)->flags = msg->msg_flags; 1059 1060 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1061 1062 /* 1063 * Put the data on the end 1064 */ 1065 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1066 1067 skb_reset_transport_header(skb); 1068 skb_put(skb, len); 1069 1070 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len); 1071 if (rc) 1072 goto out_kfree_skb; 1073 1074 /* 1075 * If the Q BIT Include socket option is in force, the first 1076 * byte of the user data is the logical value of the Q Bit. 1077 */ 1078 if (x25->qbitincl) { 1079 qbit = skb->data[0]; 1080 skb_pull(skb, 1); 1081 } 1082 1083 /* 1084 * Push down the X.25 header 1085 */ 1086 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1087 1088 if (msg->msg_flags & MSG_OOB) { 1089 if (x25->neighbour->extended) { 1090 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1091 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1092 *asmptr++ = (x25->lci >> 0) & 0xFF; 1093 *asmptr++ = X25_INTERRUPT; 1094 } else { 1095 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1096 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1097 *asmptr++ = (x25->lci >> 0) & 0xFF; 1098 *asmptr++ = X25_INTERRUPT; 1099 } 1100 } else { 1101 if (x25->neighbour->extended) { 1102 /* Build an Extended X.25 header */ 1103 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1104 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1105 *asmptr++ = (x25->lci >> 0) & 0xFF; 1106 *asmptr++ = X25_DATA; 1107 *asmptr++ = X25_DATA; 1108 } else { 1109 /* Build an Standard X.25 header */ 1110 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1111 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1112 *asmptr++ = (x25->lci >> 0) & 0xFF; 1113 *asmptr++ = X25_DATA; 1114 } 1115 1116 if (qbit) 1117 skb->data[0] |= X25_Q_BIT; 1118 } 1119 1120 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1121 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1122 1123 rc = -ENOTCONN; 1124 if (sk->sk_state != TCP_ESTABLISHED) 1125 goto out_kfree_skb; 1126 1127 if (msg->msg_flags & MSG_OOB) 1128 skb_queue_tail(&x25->interrupt_out_queue, skb); 1129 else { 1130 len = x25_output(sk, skb); 1131 if (len < 0) 1132 kfree_skb(skb); 1133 else if (x25->qbitincl) 1134 len++; 1135 } 1136 1137 /* 1138 * lock_sock() is currently only used to serialize this x25_kick() 1139 * against input-driven x25_kick() calls. It currently only blocks 1140 * incoming packets for this socket and does not protect against 1141 * any other socket state changes and is not called from anywhere 1142 * else. As x25_kick() cannot block and as long as all socket 1143 * operations are BKL-wrapped, we don't need take to care about 1144 * purging the backlog queue in x25_release(). 1145 * 1146 * Using lock_sock() to protect all socket operations entirely 1147 * (and making the whole x25 stack SMP aware) unfortunately would 1148 * require major changes to {send,recv}msg and skb allocation methods. 1149 * -> 2.5 ;) 1150 */ 1151 lock_sock(sk); 1152 x25_kick(sk); 1153 release_sock(sk); 1154 rc = len; 1155 out: 1156 return rc; 1157 out_kfree_skb: 1158 kfree_skb(skb); 1159 goto out; 1160 } 1161 1162 1163 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, 1164 struct msghdr *msg, size_t size, 1165 int flags) 1166 { 1167 struct sock *sk = sock->sk; 1168 struct x25_sock *x25 = x25_sk(sk); 1169 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; 1170 size_t copied; 1171 int qbit; 1172 struct sk_buff *skb; 1173 unsigned char *asmptr; 1174 int rc = -ENOTCONN; 1175 1176 /* 1177 * This works for seqpacket too. The receiver has ordered the queue for 1178 * us! We do one quick check first though 1179 */ 1180 if (sk->sk_state != TCP_ESTABLISHED) 1181 goto out; 1182 1183 if (flags & MSG_OOB) { 1184 rc = -EINVAL; 1185 if (sock_flag(sk, SOCK_URGINLINE) || 1186 !skb_peek(&x25->interrupt_in_queue)) 1187 goto out; 1188 1189 skb = skb_dequeue(&x25->interrupt_in_queue); 1190 1191 skb_pull(skb, X25_STD_MIN_LEN); 1192 1193 /* 1194 * No Q bit information on Interrupt data. 1195 */ 1196 if (x25->qbitincl) { 1197 asmptr = skb_push(skb, 1); 1198 *asmptr = 0x00; 1199 } 1200 1201 msg->msg_flags |= MSG_OOB; 1202 } else { 1203 /* Now we can treat all alike */ 1204 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1205 flags & MSG_DONTWAIT, &rc); 1206 if (!skb) 1207 goto out; 1208 1209 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1210 1211 skb_pull(skb, x25->neighbour->extended ? 1212 X25_EXT_MIN_LEN : X25_STD_MIN_LEN); 1213 1214 if (x25->qbitincl) { 1215 asmptr = skb_push(skb, 1); 1216 *asmptr = qbit; 1217 } 1218 } 1219 1220 skb_reset_transport_header(skb); 1221 copied = skb->len; 1222 1223 if (copied > size) { 1224 copied = size; 1225 msg->msg_flags |= MSG_TRUNC; 1226 } 1227 1228 /* Currently, each datagram always contains a complete record */ 1229 msg->msg_flags |= MSG_EOR; 1230 1231 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1232 if (rc) 1233 goto out_free_dgram; 1234 1235 if (sx25) { 1236 sx25->sx25_family = AF_X25; 1237 sx25->sx25_addr = x25->dest_addr; 1238 } 1239 1240 msg->msg_namelen = sizeof(struct sockaddr_x25); 1241 1242 lock_sock(sk); 1243 x25_check_rbuf(sk); 1244 release_sock(sk); 1245 rc = copied; 1246 out_free_dgram: 1247 skb_free_datagram(sk, skb); 1248 out: 1249 return rc; 1250 } 1251 1252 1253 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1254 { 1255 struct sock *sk = sock->sk; 1256 struct x25_sock *x25 = x25_sk(sk); 1257 void __user *argp = (void __user *)arg; 1258 int rc; 1259 1260 switch (cmd) { 1261 case TIOCOUTQ: { 1262 int amount = sk->sk_sndbuf - 1263 atomic_read(&sk->sk_wmem_alloc); 1264 if (amount < 0) 1265 amount = 0; 1266 rc = put_user(amount, (unsigned int __user *)argp); 1267 break; 1268 } 1269 1270 case TIOCINQ: { 1271 struct sk_buff *skb; 1272 int amount = 0; 1273 /* 1274 * These two are safe on a single CPU system as 1275 * only user tasks fiddle here 1276 */ 1277 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1278 amount = skb->len; 1279 rc = put_user(amount, (unsigned int __user *)argp); 1280 break; 1281 } 1282 1283 case SIOCGSTAMP: 1284 rc = -EINVAL; 1285 if (sk) 1286 rc = sock_get_timestamp(sk, 1287 (struct timeval __user *)argp); 1288 break; 1289 case SIOCGSTAMPNS: 1290 rc = -EINVAL; 1291 if (sk) 1292 rc = sock_get_timestampns(sk, 1293 (struct timespec __user *)argp); 1294 break; 1295 case SIOCGIFADDR: 1296 case SIOCSIFADDR: 1297 case SIOCGIFDSTADDR: 1298 case SIOCSIFDSTADDR: 1299 case SIOCGIFBRDADDR: 1300 case SIOCSIFBRDADDR: 1301 case SIOCGIFNETMASK: 1302 case SIOCSIFNETMASK: 1303 case SIOCGIFMETRIC: 1304 case SIOCSIFMETRIC: 1305 rc = -EINVAL; 1306 break; 1307 case SIOCADDRT: 1308 case SIOCDELRT: 1309 rc = -EPERM; 1310 if (!capable(CAP_NET_ADMIN)) 1311 break; 1312 rc = x25_route_ioctl(cmd, argp); 1313 break; 1314 case SIOCX25GSUBSCRIP: 1315 rc = x25_subscr_ioctl(cmd, argp); 1316 break; 1317 case SIOCX25SSUBSCRIP: 1318 rc = -EPERM; 1319 if (!capable(CAP_NET_ADMIN)) 1320 break; 1321 rc = x25_subscr_ioctl(cmd, argp); 1322 break; 1323 case SIOCX25GFACILITIES: { 1324 struct x25_facilities fac = x25->facilities; 1325 rc = copy_to_user(argp, &fac, 1326 sizeof(fac)) ? -EFAULT : 0; 1327 break; 1328 } 1329 1330 case SIOCX25SFACILITIES: { 1331 struct x25_facilities facilities; 1332 rc = -EFAULT; 1333 if (copy_from_user(&facilities, argp, 1334 sizeof(facilities))) 1335 break; 1336 rc = -EINVAL; 1337 if (sk->sk_state != TCP_LISTEN && 1338 sk->sk_state != TCP_CLOSE) 1339 break; 1340 if (facilities.pacsize_in < X25_PS16 || 1341 facilities.pacsize_in > X25_PS4096) 1342 break; 1343 if (facilities.pacsize_out < X25_PS16 || 1344 facilities.pacsize_out > X25_PS4096) 1345 break; 1346 if (facilities.winsize_in < 1 || 1347 facilities.winsize_in > 127) 1348 break; 1349 if (facilities.throughput < 0x03 || 1350 facilities.throughput > 0xDD) 1351 break; 1352 if (facilities.reverse && 1353 (facilities.reverse | 0x81)!= 0x81) 1354 break; 1355 x25->facilities = facilities; 1356 rc = 0; 1357 break; 1358 } 1359 1360 case SIOCX25GDTEFACILITIES: { 1361 rc = copy_to_user(argp, &x25->dte_facilities, 1362 sizeof(x25->dte_facilities)); 1363 if (rc) 1364 rc = -EFAULT; 1365 break; 1366 } 1367 1368 case SIOCX25SDTEFACILITIES: { 1369 struct x25_dte_facilities dtefacs; 1370 rc = -EFAULT; 1371 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1372 break; 1373 rc = -EINVAL; 1374 if (sk->sk_state != TCP_LISTEN && 1375 sk->sk_state != TCP_CLOSE) 1376 break; 1377 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1378 break; 1379 if (dtefacs.calling_ae == NULL) 1380 break; 1381 if (dtefacs.called_len > X25_MAX_AE_LEN) 1382 break; 1383 if (dtefacs.called_ae == NULL) 1384 break; 1385 x25->dte_facilities = dtefacs; 1386 rc = 0; 1387 break; 1388 } 1389 1390 case SIOCX25GCALLUSERDATA: { 1391 struct x25_calluserdata cud = x25->calluserdata; 1392 rc = copy_to_user(argp, &cud, 1393 sizeof(cud)) ? -EFAULT : 0; 1394 break; 1395 } 1396 1397 case SIOCX25SCALLUSERDATA: { 1398 struct x25_calluserdata calluserdata; 1399 1400 rc = -EFAULT; 1401 if (copy_from_user(&calluserdata, argp, 1402 sizeof(calluserdata))) 1403 break; 1404 rc = -EINVAL; 1405 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1406 break; 1407 x25->calluserdata = calluserdata; 1408 rc = 0; 1409 break; 1410 } 1411 1412 case SIOCX25GCAUSEDIAG: { 1413 struct x25_causediag causediag; 1414 causediag = x25->causediag; 1415 rc = copy_to_user(argp, &causediag, 1416 sizeof(causediag)) ? -EFAULT : 0; 1417 break; 1418 } 1419 1420 case SIOCX25SCUDMATCHLEN: { 1421 struct x25_subaddr sub_addr; 1422 rc = -EINVAL; 1423 if(sk->sk_state != TCP_CLOSE) 1424 break; 1425 rc = -EFAULT; 1426 if (copy_from_user(&sub_addr, argp, 1427 sizeof(sub_addr))) 1428 break; 1429 rc = -EINVAL; 1430 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1431 break; 1432 x25->cudmatchlength = sub_addr.cudmatchlength; 1433 rc = 0; 1434 break; 1435 } 1436 1437 case SIOCX25CALLACCPTAPPRV: { 1438 rc = -EINVAL; 1439 if (sk->sk_state != TCP_CLOSE) 1440 break; 1441 x25->accptapprv = X25_ALLOW_ACCPT_APPRV; 1442 rc = 0; 1443 break; 1444 } 1445 1446 case SIOCX25SENDCALLACCPT: { 1447 rc = -EINVAL; 1448 if (sk->sk_state != TCP_ESTABLISHED) 1449 break; 1450 if (x25->accptapprv) /* must call accptapprv above */ 1451 break; 1452 x25_write_internal(sk, X25_CALL_ACCEPTED); 1453 x25->state = X25_STATE_3; 1454 rc = 0; 1455 break; 1456 } 1457 1458 default: 1459 rc = -ENOIOCTLCMD; 1460 break; 1461 } 1462 1463 return rc; 1464 } 1465 1466 static struct net_proto_family x25_family_ops = { 1467 .family = AF_X25, 1468 .create = x25_create, 1469 .owner = THIS_MODULE, 1470 }; 1471 1472 #ifdef CONFIG_COMPAT 1473 static int compat_x25_subscr_ioctl(unsigned int cmd, 1474 struct compat_x25_subscrip_struct __user *x25_subscr32) 1475 { 1476 struct compat_x25_subscrip_struct x25_subscr; 1477 struct x25_neigh *nb; 1478 struct net_device *dev; 1479 int rc = -EINVAL; 1480 1481 rc = -EFAULT; 1482 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1483 goto out; 1484 1485 rc = -EINVAL; 1486 dev = x25_dev_get(x25_subscr.device); 1487 if (dev == NULL) 1488 goto out; 1489 1490 nb = x25_get_neigh(dev); 1491 if (nb == NULL) 1492 goto out_dev_put; 1493 1494 dev_put(dev); 1495 1496 if (cmd == SIOCX25GSUBSCRIP) { 1497 x25_subscr.extended = nb->extended; 1498 x25_subscr.global_facil_mask = nb->global_facil_mask; 1499 rc = copy_to_user(x25_subscr32, &x25_subscr, 1500 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1501 } else { 1502 rc = -EINVAL; 1503 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1504 rc = 0; 1505 nb->extended = x25_subscr.extended; 1506 nb->global_facil_mask = x25_subscr.global_facil_mask; 1507 } 1508 } 1509 x25_neigh_put(nb); 1510 out: 1511 return rc; 1512 out_dev_put: 1513 dev_put(dev); 1514 goto out; 1515 } 1516 1517 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1518 unsigned long arg) 1519 { 1520 void __user *argp = compat_ptr(arg); 1521 struct sock *sk = sock->sk; 1522 1523 int rc = -ENOIOCTLCMD; 1524 1525 switch(cmd) { 1526 case TIOCOUTQ: 1527 case TIOCINQ: 1528 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1529 break; 1530 case SIOCGSTAMP: 1531 rc = -EINVAL; 1532 if (sk) 1533 rc = compat_sock_get_timestamp(sk, 1534 (struct timeval __user*)argp); 1535 break; 1536 case SIOCGSTAMPNS: 1537 rc = -EINVAL; 1538 if (sk) 1539 rc = compat_sock_get_timestampns(sk, 1540 (struct timespec __user*)argp); 1541 break; 1542 case SIOCGIFADDR: 1543 case SIOCSIFADDR: 1544 case SIOCGIFDSTADDR: 1545 case SIOCSIFDSTADDR: 1546 case SIOCGIFBRDADDR: 1547 case SIOCSIFBRDADDR: 1548 case SIOCGIFNETMASK: 1549 case SIOCSIFNETMASK: 1550 case SIOCGIFMETRIC: 1551 case SIOCSIFMETRIC: 1552 rc = -EINVAL; 1553 break; 1554 case SIOCADDRT: 1555 case SIOCDELRT: 1556 rc = -EPERM; 1557 if (!capable(CAP_NET_ADMIN)) 1558 break; 1559 rc = x25_route_ioctl(cmd, argp); 1560 break; 1561 case SIOCX25GSUBSCRIP: 1562 rc = compat_x25_subscr_ioctl(cmd, argp); 1563 break; 1564 case SIOCX25SSUBSCRIP: 1565 rc = -EPERM; 1566 if (!capable(CAP_NET_ADMIN)) 1567 break; 1568 rc = compat_x25_subscr_ioctl(cmd, argp); 1569 break; 1570 case SIOCX25GFACILITIES: 1571 case SIOCX25SFACILITIES: 1572 case SIOCX25GDTEFACILITIES: 1573 case SIOCX25SDTEFACILITIES: 1574 case SIOCX25GCALLUSERDATA: 1575 case SIOCX25SCALLUSERDATA: 1576 case SIOCX25GCAUSEDIAG: 1577 case SIOCX25SCUDMATCHLEN: 1578 case SIOCX25CALLACCPTAPPRV: 1579 case SIOCX25SENDCALLACCPT: 1580 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1581 break; 1582 default: 1583 rc = -ENOIOCTLCMD; 1584 break; 1585 } 1586 return rc; 1587 } 1588 #endif 1589 1590 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = { 1591 .family = AF_X25, 1592 .owner = THIS_MODULE, 1593 .release = x25_release, 1594 .bind = x25_bind, 1595 .connect = x25_connect, 1596 .socketpair = sock_no_socketpair, 1597 .accept = x25_accept, 1598 .getname = x25_getname, 1599 .poll = datagram_poll, 1600 .ioctl = x25_ioctl, 1601 #ifdef CONFIG_COMPAT 1602 .compat_ioctl = compat_x25_ioctl, 1603 #endif 1604 .listen = x25_listen, 1605 .shutdown = sock_no_shutdown, 1606 .setsockopt = x25_setsockopt, 1607 .getsockopt = x25_getsockopt, 1608 .sendmsg = x25_sendmsg, 1609 .recvmsg = x25_recvmsg, 1610 .mmap = sock_no_mmap, 1611 .sendpage = sock_no_sendpage, 1612 }; 1613 1614 SOCKOPS_WRAP(x25_proto, AF_X25); 1615 1616 static struct packet_type x25_packet_type = { 1617 .type = __constant_htons(ETH_P_X25), 1618 .func = x25_lapb_receive_frame, 1619 }; 1620 1621 static struct notifier_block x25_dev_notifier = { 1622 .notifier_call = x25_device_event, 1623 }; 1624 1625 void x25_kill_by_neigh(struct x25_neigh *nb) 1626 { 1627 struct sock *s; 1628 struct hlist_node *node; 1629 1630 write_lock_bh(&x25_list_lock); 1631 1632 sk_for_each(s, node, &x25_list) 1633 if (x25_sk(s)->neighbour == nb) 1634 x25_disconnect(s, ENETUNREACH, 0, 0); 1635 1636 write_unlock_bh(&x25_list_lock); 1637 1638 /* Remove any related forwards */ 1639 x25_clear_forward_by_dev(nb->dev); 1640 } 1641 1642 static int __init x25_init(void) 1643 { 1644 int rc = proto_register(&x25_proto, 0); 1645 1646 if (rc != 0) 1647 goto out; 1648 1649 sock_register(&x25_family_ops); 1650 1651 dev_add_pack(&x25_packet_type); 1652 1653 register_netdevice_notifier(&x25_dev_notifier); 1654 1655 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n"); 1656 1657 #ifdef CONFIG_SYSCTL 1658 x25_register_sysctl(); 1659 #endif 1660 x25_proc_init(); 1661 out: 1662 return rc; 1663 } 1664 module_init(x25_init); 1665 1666 static void __exit x25_exit(void) 1667 { 1668 x25_proc_exit(); 1669 x25_link_free(); 1670 x25_route_free(); 1671 1672 #ifdef CONFIG_SYSCTL 1673 x25_unregister_sysctl(); 1674 #endif 1675 1676 unregister_netdevice_notifier(&x25_dev_notifier); 1677 1678 dev_remove_pack(&x25_packet_type); 1679 1680 sock_unregister(AF_X25); 1681 proto_unregister(&x25_proto); 1682 } 1683 module_exit(x25_exit); 1684 1685 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1686 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1687 MODULE_LICENSE("GPL"); 1688 MODULE_ALIAS_NETPROTO(PF_X25); 1689