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 #define pr_fmt(fmt) "X25: " fmt 39 40 #include <linux/module.h> 41 #include <linux/capability.h> 42 #include <linux/errno.h> 43 #include <linux/kernel.h> 44 #include <linux/sched/signal.h> 45 #include <linux/timer.h> 46 #include <linux/string.h> 47 #include <linux/net.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_arp.h> 50 #include <linux/skbuff.h> 51 #include <linux/slab.h> 52 #include <net/sock.h> 53 #include <net/tcp_states.h> 54 #include <linux/uaccess.h> 55 #include <linux/fcntl.h> 56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 57 #include <linux/notifier.h> 58 #include <linux/init.h> 59 #include <linux/compat.h> 60 #include <linux/ctype.h> 61 62 #include <net/x25.h> 63 #include <net/compat.h> 64 65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 66 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 67 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 68 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 69 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 70 int sysctl_x25_forward = 0; 71 72 HLIST_HEAD(x25_list); 73 DEFINE_RWLOCK(x25_list_lock); 74 75 static const struct proto_ops x25_proto_ops; 76 77 static const struct x25_address null_x25_address = {" "}; 78 79 #ifdef CONFIG_COMPAT 80 struct compat_x25_subscrip_struct { 81 char device[200-sizeof(compat_ulong_t)]; 82 compat_ulong_t global_facil_mask; 83 compat_uint_t extended; 84 }; 85 #endif 86 87 88 int x25_parse_address_block(struct sk_buff *skb, 89 struct x25_address *called_addr, 90 struct x25_address *calling_addr) 91 { 92 unsigned char len; 93 int needed; 94 int rc; 95 96 if (!pskb_may_pull(skb, 1)) { 97 /* packet has no address block */ 98 rc = 0; 99 goto empty; 100 } 101 102 len = *skb->data; 103 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2; 104 105 if (!pskb_may_pull(skb, needed)) { 106 /* packet is too short to hold the addresses it claims 107 to hold */ 108 rc = -1; 109 goto empty; 110 } 111 112 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 113 114 empty: 115 *called_addr->x25_addr = 0; 116 *calling_addr->x25_addr = 0; 117 118 return rc; 119 } 120 121 122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 123 struct x25_address *calling_addr) 124 { 125 unsigned int called_len, calling_len; 126 char *called, *calling; 127 unsigned int i; 128 129 called_len = (*p >> 0) & 0x0F; 130 calling_len = (*p >> 4) & 0x0F; 131 132 called = called_addr->x25_addr; 133 calling = calling_addr->x25_addr; 134 p++; 135 136 for (i = 0; i < (called_len + calling_len); i++) { 137 if (i < called_len) { 138 if (i % 2 != 0) { 139 *called++ = ((*p >> 0) & 0x0F) + '0'; 140 p++; 141 } else { 142 *called++ = ((*p >> 4) & 0x0F) + '0'; 143 } 144 } else { 145 if (i % 2 != 0) { 146 *calling++ = ((*p >> 0) & 0x0F) + '0'; 147 p++; 148 } else { 149 *calling++ = ((*p >> 4) & 0x0F) + '0'; 150 } 151 } 152 } 153 154 *called = *calling = '\0'; 155 156 return 1 + (called_len + calling_len + 1) / 2; 157 } 158 159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 160 struct x25_address *calling_addr) 161 { 162 unsigned int called_len, calling_len; 163 char *called, *calling; 164 int i; 165 166 called = called_addr->x25_addr; 167 calling = calling_addr->x25_addr; 168 169 called_len = strlen(called); 170 calling_len = strlen(calling); 171 172 *p++ = (calling_len << 4) | (called_len << 0); 173 174 for (i = 0; i < (called_len + calling_len); i++) { 175 if (i < called_len) { 176 if (i % 2 != 0) { 177 *p |= (*called++ - '0') << 0; 178 p++; 179 } else { 180 *p = 0x00; 181 *p |= (*called++ - '0') << 4; 182 } 183 } else { 184 if (i % 2 != 0) { 185 *p |= (*calling++ - '0') << 0; 186 p++; 187 } else { 188 *p = 0x00; 189 *p |= (*calling++ - '0') << 4; 190 } 191 } 192 } 193 194 return 1 + (called_len + calling_len + 1) / 2; 195 } 196 197 /* 198 * Socket removal during an interrupt is now safe. 199 */ 200 static void x25_remove_socket(struct sock *sk) 201 { 202 write_lock_bh(&x25_list_lock); 203 sk_del_node_init(sk); 204 write_unlock_bh(&x25_list_lock); 205 } 206 207 /* 208 * Kill all bound sockets on a dropped device. 209 */ 210 static void x25_kill_by_device(struct net_device *dev) 211 { 212 struct sock *s; 213 214 write_lock_bh(&x25_list_lock); 215 216 sk_for_each(s, &x25_list) 217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 218 x25_disconnect(s, ENETUNREACH, 0, 0); 219 220 write_unlock_bh(&x25_list_lock); 221 } 222 223 /* 224 * Handle device status changes. 225 */ 226 static int x25_device_event(struct notifier_block *this, unsigned long event, 227 void *ptr) 228 { 229 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 230 struct x25_neigh *nb; 231 232 if (!net_eq(dev_net(dev), &init_net)) 233 return NOTIFY_DONE; 234 235 if (dev->type == ARPHRD_X25 236 #if IS_ENABLED(CONFIG_LLC) 237 || dev->type == ARPHRD_ETHER 238 #endif 239 ) { 240 switch (event) { 241 case NETDEV_UP: 242 x25_link_device_up(dev); 243 break; 244 case NETDEV_GOING_DOWN: 245 nb = x25_get_neigh(dev); 246 if (nb) { 247 x25_terminate_link(nb); 248 x25_neigh_put(nb); 249 } 250 break; 251 case NETDEV_DOWN: 252 x25_kill_by_device(dev); 253 x25_route_device_down(dev); 254 x25_link_device_down(dev); 255 break; 256 } 257 } 258 259 return NOTIFY_DONE; 260 } 261 262 /* 263 * Add a socket to the bound sockets list. 264 */ 265 static void x25_insert_socket(struct sock *sk) 266 { 267 write_lock_bh(&x25_list_lock); 268 sk_add_node(sk, &x25_list); 269 write_unlock_bh(&x25_list_lock); 270 } 271 272 /* 273 * Find a socket that wants to accept the Call Request we just 274 * received. Check the full list for an address/cud match. 275 * If no cuds match return the next_best thing, an address match. 276 * Note: if a listening socket has cud set it must only get calls 277 * with matching cud. 278 */ 279 static struct sock *x25_find_listener(struct x25_address *addr, 280 struct sk_buff *skb) 281 { 282 struct sock *s; 283 struct sock *next_best; 284 285 read_lock_bh(&x25_list_lock); 286 next_best = NULL; 287 288 sk_for_each(s, &x25_list) 289 if ((!strcmp(addr->x25_addr, 290 x25_sk(s)->source_addr.x25_addr) || 291 !strcmp(x25_sk(s)->source_addr.x25_addr, 292 null_x25_address.x25_addr)) && 293 s->sk_state == TCP_LISTEN) { 294 /* 295 * Found a listening socket, now check the incoming 296 * call user data vs this sockets call user data 297 */ 298 if (x25_sk(s)->cudmatchlength > 0 && 299 skb->len >= x25_sk(s)->cudmatchlength) { 300 if((memcmp(x25_sk(s)->calluserdata.cuddata, 301 skb->data, 302 x25_sk(s)->cudmatchlength)) == 0) { 303 sock_hold(s); 304 goto found; 305 } 306 } else 307 next_best = s; 308 } 309 if (next_best) { 310 s = next_best; 311 sock_hold(s); 312 goto found; 313 } 314 s = NULL; 315 found: 316 read_unlock_bh(&x25_list_lock); 317 return s; 318 } 319 320 /* 321 * Find a connected X.25 socket given my LCI and neighbour. 322 */ 323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 324 { 325 struct sock *s; 326 327 sk_for_each(s, &x25_list) 328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 329 sock_hold(s); 330 goto found; 331 } 332 s = NULL; 333 found: 334 return s; 335 } 336 337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 338 { 339 struct sock *s; 340 341 read_lock_bh(&x25_list_lock); 342 s = __x25_find_socket(lci, nb); 343 read_unlock_bh(&x25_list_lock); 344 return s; 345 } 346 347 /* 348 * Find a unique LCI for a given device. 349 */ 350 static unsigned int x25_new_lci(struct x25_neigh *nb) 351 { 352 unsigned int lci = 1; 353 struct sock *sk; 354 355 while ((sk = x25_find_socket(lci, nb)) != NULL) { 356 sock_put(sk); 357 if (++lci == 4096) { 358 lci = 0; 359 break; 360 } 361 cond_resched(); 362 } 363 364 return lci; 365 } 366 367 /* 368 * Deferred destroy. 369 */ 370 static void __x25_destroy_socket(struct sock *); 371 372 /* 373 * handler for deferred kills. 374 */ 375 static void x25_destroy_timer(struct timer_list *t) 376 { 377 struct sock *sk = from_timer(sk, t, sk_timer); 378 379 x25_destroy_socket_from_timer(sk); 380 } 381 382 /* 383 * This is called from user mode and the timers. Thus it protects itself 384 * against interrupt users but doesn't worry about being called during 385 * work. Once it is removed from the queue no interrupt or bottom half 386 * will touch it and we are (fairly 8-) ) safe. 387 * Not static as it's used by the timer 388 */ 389 static void __x25_destroy_socket(struct sock *sk) 390 { 391 struct sk_buff *skb; 392 393 x25_stop_heartbeat(sk); 394 x25_stop_timer(sk); 395 396 x25_remove_socket(sk); 397 x25_clear_queues(sk); /* Flush the queues */ 398 399 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 400 if (skb->sk != sk) { /* A pending connection */ 401 /* 402 * Queue the unaccepted socket for death 403 */ 404 skb->sk->sk_state = TCP_LISTEN; 405 sock_set_flag(skb->sk, SOCK_DEAD); 406 x25_start_heartbeat(skb->sk); 407 x25_sk(skb->sk)->state = X25_STATE_0; 408 } 409 410 kfree_skb(skb); 411 } 412 413 if (sk_has_allocations(sk)) { 414 /* Defer: outstanding buffers */ 415 sk->sk_timer.expires = jiffies + 10 * HZ; 416 sk->sk_timer.function = x25_destroy_timer; 417 add_timer(&sk->sk_timer); 418 } else { 419 /* drop last reference so sock_put will free */ 420 __sock_put(sk); 421 } 422 } 423 424 void x25_destroy_socket_from_timer(struct sock *sk) 425 { 426 sock_hold(sk); 427 bh_lock_sock(sk); 428 __x25_destroy_socket(sk); 429 bh_unlock_sock(sk); 430 sock_put(sk); 431 } 432 433 /* 434 * Handling for system calls applied via the various interfaces to a 435 * X.25 socket object. 436 */ 437 438 static int x25_setsockopt(struct socket *sock, int level, int optname, 439 char __user *optval, unsigned int optlen) 440 { 441 int opt; 442 struct sock *sk = sock->sk; 443 int rc = -ENOPROTOOPT; 444 445 if (level != SOL_X25 || optname != X25_QBITINCL) 446 goto out; 447 448 rc = -EINVAL; 449 if (optlen < sizeof(int)) 450 goto out; 451 452 rc = -EFAULT; 453 if (get_user(opt, (int __user *)optval)) 454 goto out; 455 456 if (opt) 457 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 458 else 459 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 460 rc = 0; 461 out: 462 return rc; 463 } 464 465 static int x25_getsockopt(struct socket *sock, int level, int optname, 466 char __user *optval, int __user *optlen) 467 { 468 struct sock *sk = sock->sk; 469 int val, len, rc = -ENOPROTOOPT; 470 471 if (level != SOL_X25 || optname != X25_QBITINCL) 472 goto out; 473 474 rc = -EFAULT; 475 if (get_user(len, optlen)) 476 goto out; 477 478 len = min_t(unsigned int, len, sizeof(int)); 479 480 rc = -EINVAL; 481 if (len < 0) 482 goto out; 483 484 rc = -EFAULT; 485 if (put_user(len, optlen)) 486 goto out; 487 488 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 489 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 490 out: 491 return rc; 492 } 493 494 static int x25_listen(struct socket *sock, int backlog) 495 { 496 struct sock *sk = sock->sk; 497 int rc = -EOPNOTSUPP; 498 499 lock_sock(sk); 500 if (sk->sk_state != TCP_LISTEN) { 501 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 502 sk->sk_max_ack_backlog = backlog; 503 sk->sk_state = TCP_LISTEN; 504 rc = 0; 505 } 506 release_sock(sk); 507 508 return rc; 509 } 510 511 static struct proto x25_proto = { 512 .name = "X25", 513 .owner = THIS_MODULE, 514 .obj_size = sizeof(struct x25_sock), 515 }; 516 517 static struct sock *x25_alloc_socket(struct net *net, int kern) 518 { 519 struct x25_sock *x25; 520 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 521 522 if (!sk) 523 goto out; 524 525 sock_init_data(NULL, sk); 526 527 x25 = x25_sk(sk); 528 skb_queue_head_init(&x25->ack_queue); 529 skb_queue_head_init(&x25->fragment_queue); 530 skb_queue_head_init(&x25->interrupt_in_queue); 531 skb_queue_head_init(&x25->interrupt_out_queue); 532 out: 533 return sk; 534 } 535 536 static int x25_create(struct net *net, struct socket *sock, int protocol, 537 int kern) 538 { 539 struct sock *sk; 540 struct x25_sock *x25; 541 int rc = -EAFNOSUPPORT; 542 543 if (!net_eq(net, &init_net)) 544 goto out; 545 546 rc = -ESOCKTNOSUPPORT; 547 if (sock->type != SOCK_SEQPACKET) 548 goto out; 549 550 rc = -EINVAL; 551 if (protocol) 552 goto out; 553 554 rc = -ENOBUFS; 555 if ((sk = x25_alloc_socket(net, kern)) == NULL) 556 goto out; 557 558 x25 = x25_sk(sk); 559 560 sock_init_data(sock, sk); 561 562 x25_init_timers(sk); 563 564 sock->ops = &x25_proto_ops; 565 sk->sk_protocol = protocol; 566 sk->sk_backlog_rcv = x25_backlog_rcv; 567 568 x25->t21 = sysctl_x25_call_request_timeout; 569 x25->t22 = sysctl_x25_reset_request_timeout; 570 x25->t23 = sysctl_x25_clear_request_timeout; 571 x25->t2 = sysctl_x25_ack_holdback_timeout; 572 x25->state = X25_STATE_0; 573 x25->cudmatchlength = 0; 574 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 575 /* on call accept */ 576 577 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 578 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 579 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 580 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 581 x25->facilities.throughput = 0; /* by default don't negotiate 582 throughput */ 583 x25->facilities.reverse = X25_DEFAULT_REVERSE; 584 x25->dte_facilities.calling_len = 0; 585 x25->dte_facilities.called_len = 0; 586 memset(x25->dte_facilities.called_ae, '\0', 587 sizeof(x25->dte_facilities.called_ae)); 588 memset(x25->dte_facilities.calling_ae, '\0', 589 sizeof(x25->dte_facilities.calling_ae)); 590 591 rc = 0; 592 out: 593 return rc; 594 } 595 596 static struct sock *x25_make_new(struct sock *osk) 597 { 598 struct sock *sk = NULL; 599 struct x25_sock *x25, *ox25; 600 601 if (osk->sk_type != SOCK_SEQPACKET) 602 goto out; 603 604 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 605 goto out; 606 607 x25 = x25_sk(sk); 608 609 sk->sk_type = osk->sk_type; 610 sk->sk_priority = osk->sk_priority; 611 sk->sk_protocol = osk->sk_protocol; 612 sk->sk_rcvbuf = osk->sk_rcvbuf; 613 sk->sk_sndbuf = osk->sk_sndbuf; 614 sk->sk_state = TCP_ESTABLISHED; 615 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 616 sock_copy_flags(sk, osk); 617 618 ox25 = x25_sk(osk); 619 x25->t21 = ox25->t21; 620 x25->t22 = ox25->t22; 621 x25->t23 = ox25->t23; 622 x25->t2 = ox25->t2; 623 x25->flags = ox25->flags; 624 x25->facilities = ox25->facilities; 625 x25->dte_facilities = ox25->dte_facilities; 626 x25->cudmatchlength = ox25->cudmatchlength; 627 628 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 629 x25_init_timers(sk); 630 out: 631 return sk; 632 } 633 634 static int x25_release(struct socket *sock) 635 { 636 struct sock *sk = sock->sk; 637 struct x25_sock *x25; 638 639 if (!sk) 640 return 0; 641 642 x25 = x25_sk(sk); 643 644 sock_hold(sk); 645 lock_sock(sk); 646 switch (x25->state) { 647 648 case X25_STATE_0: 649 case X25_STATE_2: 650 x25_disconnect(sk, 0, 0, 0); 651 __x25_destroy_socket(sk); 652 goto out; 653 654 case X25_STATE_1: 655 case X25_STATE_3: 656 case X25_STATE_4: 657 x25_clear_queues(sk); 658 x25_write_internal(sk, X25_CLEAR_REQUEST); 659 x25_start_t23timer(sk); 660 x25->state = X25_STATE_2; 661 sk->sk_state = TCP_CLOSE; 662 sk->sk_shutdown |= SEND_SHUTDOWN; 663 sk->sk_state_change(sk); 664 sock_set_flag(sk, SOCK_DEAD); 665 sock_set_flag(sk, SOCK_DESTROY); 666 break; 667 } 668 669 sock_orphan(sk); 670 out: 671 release_sock(sk); 672 sock_put(sk); 673 return 0; 674 } 675 676 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 677 { 678 struct sock *sk = sock->sk; 679 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 680 int len, i, rc = 0; 681 682 if (addr_len != sizeof(struct sockaddr_x25) || 683 addr->sx25_family != AF_X25) { 684 rc = -EINVAL; 685 goto out; 686 } 687 688 /* check for the null_x25_address */ 689 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { 690 691 len = strlen(addr->sx25_addr.x25_addr); 692 for (i = 0; i < len; i++) { 693 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 694 rc = -EINVAL; 695 goto out; 696 } 697 } 698 } 699 700 lock_sock(sk); 701 if (sock_flag(sk, SOCK_ZAPPED)) { 702 x25_sk(sk)->source_addr = addr->sx25_addr; 703 x25_insert_socket(sk); 704 sock_reset_flag(sk, SOCK_ZAPPED); 705 } else { 706 rc = -EINVAL; 707 } 708 release_sock(sk); 709 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 710 out: 711 return rc; 712 } 713 714 static int x25_wait_for_connection_establishment(struct sock *sk) 715 { 716 DECLARE_WAITQUEUE(wait, current); 717 int rc; 718 719 add_wait_queue_exclusive(sk_sleep(sk), &wait); 720 for (;;) { 721 __set_current_state(TASK_INTERRUPTIBLE); 722 rc = -ERESTARTSYS; 723 if (signal_pending(current)) 724 break; 725 rc = sock_error(sk); 726 if (rc) { 727 sk->sk_socket->state = SS_UNCONNECTED; 728 break; 729 } 730 rc = 0; 731 if (sk->sk_state != TCP_ESTABLISHED) { 732 release_sock(sk); 733 schedule(); 734 lock_sock(sk); 735 } else 736 break; 737 } 738 __set_current_state(TASK_RUNNING); 739 remove_wait_queue(sk_sleep(sk), &wait); 740 return rc; 741 } 742 743 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 744 int addr_len, int flags) 745 { 746 struct sock *sk = sock->sk; 747 struct x25_sock *x25 = x25_sk(sk); 748 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 749 struct x25_route *rt; 750 int rc = 0; 751 752 lock_sock(sk); 753 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 754 sock->state = SS_CONNECTED; 755 goto out; /* Connect completed during a ERESTARTSYS event */ 756 } 757 758 rc = -ECONNREFUSED; 759 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 760 sock->state = SS_UNCONNECTED; 761 goto out; 762 } 763 764 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 765 if (sk->sk_state == TCP_ESTABLISHED) 766 goto out; 767 768 sk->sk_state = TCP_CLOSE; 769 sock->state = SS_UNCONNECTED; 770 771 rc = -EINVAL; 772 if (addr_len != sizeof(struct sockaddr_x25) || 773 addr->sx25_family != AF_X25) 774 goto out; 775 776 rc = -ENETUNREACH; 777 rt = x25_get_route(&addr->sx25_addr); 778 if (!rt) 779 goto out; 780 781 x25->neighbour = x25_get_neigh(rt->dev); 782 if (!x25->neighbour) 783 goto out_put_route; 784 785 x25_limit_facilities(&x25->facilities, x25->neighbour); 786 787 x25->lci = x25_new_lci(x25->neighbour); 788 if (!x25->lci) 789 goto out_put_neigh; 790 791 rc = -EINVAL; 792 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 793 goto out_put_neigh; 794 795 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 796 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 797 798 x25->dest_addr = addr->sx25_addr; 799 800 /* Move to connecting socket, start sending Connect Requests */ 801 sock->state = SS_CONNECTING; 802 sk->sk_state = TCP_SYN_SENT; 803 804 x25->state = X25_STATE_1; 805 806 x25_write_internal(sk, X25_CALL_REQUEST); 807 808 x25_start_heartbeat(sk); 809 x25_start_t21timer(sk); 810 811 /* Now the loop */ 812 rc = -EINPROGRESS; 813 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 814 goto out_put_neigh; 815 816 rc = x25_wait_for_connection_establishment(sk); 817 if (rc) 818 goto out_put_neigh; 819 820 sock->state = SS_CONNECTED; 821 rc = 0; 822 out_put_neigh: 823 if (rc) { 824 read_lock_bh(&x25_list_lock); 825 x25_neigh_put(x25->neighbour); 826 x25->neighbour = NULL; 827 read_unlock_bh(&x25_list_lock); 828 x25->state = X25_STATE_0; 829 } 830 out_put_route: 831 x25_route_put(rt); 832 out: 833 release_sock(sk); 834 return rc; 835 } 836 837 static int x25_wait_for_data(struct sock *sk, long timeout) 838 { 839 DECLARE_WAITQUEUE(wait, current); 840 int rc = 0; 841 842 add_wait_queue_exclusive(sk_sleep(sk), &wait); 843 for (;;) { 844 __set_current_state(TASK_INTERRUPTIBLE); 845 if (sk->sk_shutdown & RCV_SHUTDOWN) 846 break; 847 rc = -ERESTARTSYS; 848 if (signal_pending(current)) 849 break; 850 rc = -EAGAIN; 851 if (!timeout) 852 break; 853 rc = 0; 854 if (skb_queue_empty(&sk->sk_receive_queue)) { 855 release_sock(sk); 856 timeout = schedule_timeout(timeout); 857 lock_sock(sk); 858 } else 859 break; 860 } 861 __set_current_state(TASK_RUNNING); 862 remove_wait_queue(sk_sleep(sk), &wait); 863 return rc; 864 } 865 866 static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 867 bool kern) 868 { 869 struct sock *sk = sock->sk; 870 struct sock *newsk; 871 struct sk_buff *skb; 872 int rc = -EINVAL; 873 874 if (!sk) 875 goto out; 876 877 rc = -EOPNOTSUPP; 878 if (sk->sk_type != SOCK_SEQPACKET) 879 goto out; 880 881 lock_sock(sk); 882 rc = -EINVAL; 883 if (sk->sk_state != TCP_LISTEN) 884 goto out2; 885 886 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 887 if (rc) 888 goto out2; 889 skb = skb_dequeue(&sk->sk_receive_queue); 890 rc = -EINVAL; 891 if (!skb->sk) 892 goto out2; 893 newsk = skb->sk; 894 sock_graft(newsk, newsock); 895 896 /* Now attach up the new socket */ 897 skb->sk = NULL; 898 kfree_skb(skb); 899 sk->sk_ack_backlog--; 900 newsock->state = SS_CONNECTED; 901 rc = 0; 902 out2: 903 release_sock(sk); 904 out: 905 return rc; 906 } 907 908 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 909 int peer) 910 { 911 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 912 struct sock *sk = sock->sk; 913 struct x25_sock *x25 = x25_sk(sk); 914 int rc = 0; 915 916 if (peer) { 917 if (sk->sk_state != TCP_ESTABLISHED) { 918 rc = -ENOTCONN; 919 goto out; 920 } 921 sx25->sx25_addr = x25->dest_addr; 922 } else 923 sx25->sx25_addr = x25->source_addr; 924 925 sx25->sx25_family = AF_X25; 926 rc = sizeof(*sx25); 927 928 out: 929 return rc; 930 } 931 932 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 933 unsigned int lci) 934 { 935 struct sock *sk; 936 struct sock *make; 937 struct x25_sock *makex25; 938 struct x25_address source_addr, dest_addr; 939 struct x25_facilities facilities; 940 struct x25_dte_facilities dte_facilities; 941 int len, addr_len, rc; 942 943 /* 944 * Remove the LCI and frame type. 945 */ 946 skb_pull(skb, X25_STD_MIN_LEN); 947 948 /* 949 * Extract the X.25 addresses and convert them to ASCII strings, 950 * and remove them. 951 * 952 * Address block is mandatory in call request packets 953 */ 954 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 955 if (addr_len <= 0) 956 goto out_clear_request; 957 skb_pull(skb, addr_len); 958 959 /* 960 * Get the length of the facilities, skip past them for the moment 961 * get the call user data because this is needed to determine 962 * the correct listener 963 * 964 * Facilities length is mandatory in call request packets 965 */ 966 if (!pskb_may_pull(skb, 1)) 967 goto out_clear_request; 968 len = skb->data[0] + 1; 969 if (!pskb_may_pull(skb, len)) 970 goto out_clear_request; 971 skb_pull(skb,len); 972 973 /* 974 * Ensure that the amount of call user data is valid. 975 */ 976 if (skb->len > X25_MAX_CUD_LEN) 977 goto out_clear_request; 978 979 /* 980 * Get all the call user data so it can be used in 981 * x25_find_listener and skb_copy_from_linear_data up ahead. 982 */ 983 if (!pskb_may_pull(skb, skb->len)) 984 goto out_clear_request; 985 986 /* 987 * Find a listener for the particular address/cud pair. 988 */ 989 sk = x25_find_listener(&source_addr,skb); 990 skb_push(skb,len); 991 992 if (sk != NULL && sk_acceptq_is_full(sk)) { 993 goto out_sock_put; 994 } 995 996 /* 997 * We dont have any listeners for this incoming call. 998 * Try forwarding it. 999 */ 1000 if (sk == NULL) { 1001 skb_push(skb, addr_len + X25_STD_MIN_LEN); 1002 if (sysctl_x25_forward && 1003 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 1004 { 1005 /* Call was forwarded, dont process it any more */ 1006 kfree_skb(skb); 1007 rc = 1; 1008 goto out; 1009 } else { 1010 /* No listeners, can't forward, clear the call */ 1011 goto out_clear_request; 1012 } 1013 } 1014 1015 /* 1016 * Try to reach a compromise on the requested facilities. 1017 */ 1018 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1019 if (len == -1) 1020 goto out_sock_put; 1021 1022 /* 1023 * current neighbour/link might impose additional limits 1024 * on certain facilties 1025 */ 1026 1027 x25_limit_facilities(&facilities, nb); 1028 1029 /* 1030 * Try to create a new socket. 1031 */ 1032 make = x25_make_new(sk); 1033 if (!make) 1034 goto out_sock_put; 1035 1036 /* 1037 * Remove the facilities 1038 */ 1039 skb_pull(skb, len); 1040 1041 skb->sk = make; 1042 make->sk_state = TCP_ESTABLISHED; 1043 1044 makex25 = x25_sk(make); 1045 makex25->lci = lci; 1046 makex25->dest_addr = dest_addr; 1047 makex25->source_addr = source_addr; 1048 makex25->neighbour = nb; 1049 makex25->facilities = facilities; 1050 makex25->dte_facilities= dte_facilities; 1051 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1052 /* ensure no reverse facil on accept */ 1053 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1054 /* ensure no calling address extension on accept */ 1055 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1056 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1057 1058 /* Normally all calls are accepted immediately */ 1059 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1060 x25_write_internal(make, X25_CALL_ACCEPTED); 1061 makex25->state = X25_STATE_3; 1062 } 1063 1064 /* 1065 * Incoming Call User Data. 1066 */ 1067 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1068 makex25->calluserdata.cudlength = skb->len; 1069 1070 sk->sk_ack_backlog++; 1071 1072 x25_insert_socket(make); 1073 1074 skb_queue_head(&sk->sk_receive_queue, skb); 1075 1076 x25_start_heartbeat(make); 1077 1078 if (!sock_flag(sk, SOCK_DEAD)) 1079 sk->sk_data_ready(sk); 1080 rc = 1; 1081 sock_put(sk); 1082 out: 1083 return rc; 1084 out_sock_put: 1085 sock_put(sk); 1086 out_clear_request: 1087 rc = 0; 1088 x25_transmit_clear_request(nb, lci, 0x01); 1089 goto out; 1090 } 1091 1092 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1093 { 1094 struct sock *sk = sock->sk; 1095 struct x25_sock *x25 = x25_sk(sk); 1096 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1097 struct sockaddr_x25 sx25; 1098 struct sk_buff *skb; 1099 unsigned char *asmptr; 1100 int noblock = msg->msg_flags & MSG_DONTWAIT; 1101 size_t size; 1102 int qbit = 0, rc = -EINVAL; 1103 1104 lock_sock(sk); 1105 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1106 goto out; 1107 1108 /* we currently don't support segmented records at the user interface */ 1109 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1110 goto out; 1111 1112 rc = -EADDRNOTAVAIL; 1113 if (sock_flag(sk, SOCK_ZAPPED)) 1114 goto out; 1115 1116 rc = -EPIPE; 1117 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1118 send_sig(SIGPIPE, current, 0); 1119 goto out; 1120 } 1121 1122 rc = -ENETUNREACH; 1123 if (!x25->neighbour) 1124 goto out; 1125 1126 if (usx25) { 1127 rc = -EINVAL; 1128 if (msg->msg_namelen < sizeof(sx25)) 1129 goto out; 1130 memcpy(&sx25, usx25, sizeof(sx25)); 1131 rc = -EISCONN; 1132 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1133 goto out; 1134 rc = -EINVAL; 1135 if (sx25.sx25_family != AF_X25) 1136 goto out; 1137 } else { 1138 /* 1139 * FIXME 1003.1g - if the socket is like this because 1140 * it has become closed (not started closed) we ought 1141 * to SIGPIPE, EPIPE; 1142 */ 1143 rc = -ENOTCONN; 1144 if (sk->sk_state != TCP_ESTABLISHED) 1145 goto out; 1146 1147 sx25.sx25_family = AF_X25; 1148 sx25.sx25_addr = x25->dest_addr; 1149 } 1150 1151 /* Sanity check the packet size */ 1152 if (len > 65535) { 1153 rc = -EMSGSIZE; 1154 goto out; 1155 } 1156 1157 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1158 1159 /* Build a packet */ 1160 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1161 1162 if ((msg->msg_flags & MSG_OOB) && len > 32) 1163 len = 32; 1164 1165 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1166 1167 release_sock(sk); 1168 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1169 lock_sock(sk); 1170 if (!skb) 1171 goto out; 1172 X25_SKB_CB(skb)->flags = msg->msg_flags; 1173 1174 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1175 1176 /* 1177 * Put the data on the end 1178 */ 1179 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1180 1181 skb_reset_transport_header(skb); 1182 skb_put(skb, len); 1183 1184 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1185 if (rc) 1186 goto out_kfree_skb; 1187 1188 /* 1189 * If the Q BIT Include socket option is in force, the first 1190 * byte of the user data is the logical value of the Q Bit. 1191 */ 1192 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1193 if (!pskb_may_pull(skb, 1)) 1194 goto out_kfree_skb; 1195 1196 qbit = skb->data[0]; 1197 skb_pull(skb, 1); 1198 } 1199 1200 /* 1201 * Push down the X.25 header 1202 */ 1203 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1204 1205 if (msg->msg_flags & MSG_OOB) { 1206 if (x25->neighbour->extended) { 1207 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1208 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1209 *asmptr++ = (x25->lci >> 0) & 0xFF; 1210 *asmptr++ = X25_INTERRUPT; 1211 } else { 1212 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1213 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1214 *asmptr++ = (x25->lci >> 0) & 0xFF; 1215 *asmptr++ = X25_INTERRUPT; 1216 } 1217 } else { 1218 if (x25->neighbour->extended) { 1219 /* Build an Extended X.25 header */ 1220 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1221 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1222 *asmptr++ = (x25->lci >> 0) & 0xFF; 1223 *asmptr++ = X25_DATA; 1224 *asmptr++ = X25_DATA; 1225 } else { 1226 /* Build an Standard X.25 header */ 1227 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1228 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1229 *asmptr++ = (x25->lci >> 0) & 0xFF; 1230 *asmptr++ = X25_DATA; 1231 } 1232 1233 if (qbit) 1234 skb->data[0] |= X25_Q_BIT; 1235 } 1236 1237 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1238 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1239 1240 rc = -ENOTCONN; 1241 if (sk->sk_state != TCP_ESTABLISHED) 1242 goto out_kfree_skb; 1243 1244 if (msg->msg_flags & MSG_OOB) 1245 skb_queue_tail(&x25->interrupt_out_queue, skb); 1246 else { 1247 rc = x25_output(sk, skb); 1248 len = rc; 1249 if (rc < 0) 1250 kfree_skb(skb); 1251 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1252 len++; 1253 } 1254 1255 x25_kick(sk); 1256 rc = len; 1257 out: 1258 release_sock(sk); 1259 return rc; 1260 out_kfree_skb: 1261 kfree_skb(skb); 1262 goto out; 1263 } 1264 1265 1266 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1267 int flags) 1268 { 1269 struct sock *sk = sock->sk; 1270 struct x25_sock *x25 = x25_sk(sk); 1271 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1272 size_t copied; 1273 int qbit, header_len; 1274 struct sk_buff *skb; 1275 unsigned char *asmptr; 1276 int rc = -ENOTCONN; 1277 1278 lock_sock(sk); 1279 1280 if (x25->neighbour == NULL) 1281 goto out; 1282 1283 header_len = x25->neighbour->extended ? 1284 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1285 1286 /* 1287 * This works for seqpacket too. The receiver has ordered the queue for 1288 * us! We do one quick check first though 1289 */ 1290 if (sk->sk_state != TCP_ESTABLISHED) 1291 goto out; 1292 1293 if (flags & MSG_OOB) { 1294 rc = -EINVAL; 1295 if (sock_flag(sk, SOCK_URGINLINE) || 1296 !skb_peek(&x25->interrupt_in_queue)) 1297 goto out; 1298 1299 skb = skb_dequeue(&x25->interrupt_in_queue); 1300 1301 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1302 goto out_free_dgram; 1303 1304 skb_pull(skb, X25_STD_MIN_LEN); 1305 1306 /* 1307 * No Q bit information on Interrupt data. 1308 */ 1309 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1310 asmptr = skb_push(skb, 1); 1311 *asmptr = 0x00; 1312 } 1313 1314 msg->msg_flags |= MSG_OOB; 1315 } else { 1316 /* Now we can treat all alike */ 1317 release_sock(sk); 1318 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1319 flags & MSG_DONTWAIT, &rc); 1320 lock_sock(sk); 1321 if (!skb) 1322 goto out; 1323 1324 if (!pskb_may_pull(skb, header_len)) 1325 goto out_free_dgram; 1326 1327 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1328 1329 skb_pull(skb, header_len); 1330 1331 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1332 asmptr = skb_push(skb, 1); 1333 *asmptr = qbit; 1334 } 1335 } 1336 1337 skb_reset_transport_header(skb); 1338 copied = skb->len; 1339 1340 if (copied > size) { 1341 copied = size; 1342 msg->msg_flags |= MSG_TRUNC; 1343 } 1344 1345 /* Currently, each datagram always contains a complete record */ 1346 msg->msg_flags |= MSG_EOR; 1347 1348 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1349 if (rc) 1350 goto out_free_dgram; 1351 1352 if (sx25) { 1353 sx25->sx25_family = AF_X25; 1354 sx25->sx25_addr = x25->dest_addr; 1355 msg->msg_namelen = sizeof(*sx25); 1356 } 1357 1358 x25_check_rbuf(sk); 1359 rc = copied; 1360 out_free_dgram: 1361 skb_free_datagram(sk, skb); 1362 out: 1363 release_sock(sk); 1364 return rc; 1365 } 1366 1367 1368 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1369 { 1370 struct sock *sk = sock->sk; 1371 struct x25_sock *x25 = x25_sk(sk); 1372 void __user *argp = (void __user *)arg; 1373 int rc; 1374 1375 switch (cmd) { 1376 case TIOCOUTQ: { 1377 int amount; 1378 1379 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1380 if (amount < 0) 1381 amount = 0; 1382 rc = put_user(amount, (unsigned int __user *)argp); 1383 break; 1384 } 1385 1386 case TIOCINQ: { 1387 struct sk_buff *skb; 1388 int amount = 0; 1389 /* 1390 * These two are safe on a single CPU system as 1391 * only user tasks fiddle here 1392 */ 1393 lock_sock(sk); 1394 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1395 amount = skb->len; 1396 release_sock(sk); 1397 rc = put_user(amount, (unsigned int __user *)argp); 1398 break; 1399 } 1400 1401 case SIOCGIFADDR: 1402 case SIOCSIFADDR: 1403 case SIOCGIFDSTADDR: 1404 case SIOCSIFDSTADDR: 1405 case SIOCGIFBRDADDR: 1406 case SIOCSIFBRDADDR: 1407 case SIOCGIFNETMASK: 1408 case SIOCSIFNETMASK: 1409 case SIOCGIFMETRIC: 1410 case SIOCSIFMETRIC: 1411 rc = -EINVAL; 1412 break; 1413 case SIOCADDRT: 1414 case SIOCDELRT: 1415 rc = -EPERM; 1416 if (!capable(CAP_NET_ADMIN)) 1417 break; 1418 rc = x25_route_ioctl(cmd, argp); 1419 break; 1420 case SIOCX25GSUBSCRIP: 1421 rc = x25_subscr_ioctl(cmd, argp); 1422 break; 1423 case SIOCX25SSUBSCRIP: 1424 rc = -EPERM; 1425 if (!capable(CAP_NET_ADMIN)) 1426 break; 1427 rc = x25_subscr_ioctl(cmd, argp); 1428 break; 1429 case SIOCX25GFACILITIES: { 1430 lock_sock(sk); 1431 rc = copy_to_user(argp, &x25->facilities, 1432 sizeof(x25->facilities)) 1433 ? -EFAULT : 0; 1434 release_sock(sk); 1435 break; 1436 } 1437 1438 case SIOCX25SFACILITIES: { 1439 struct x25_facilities facilities; 1440 rc = -EFAULT; 1441 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1442 break; 1443 rc = -EINVAL; 1444 lock_sock(sk); 1445 if (sk->sk_state != TCP_LISTEN && 1446 sk->sk_state != TCP_CLOSE) 1447 goto out_fac_release; 1448 if (facilities.pacsize_in < X25_PS16 || 1449 facilities.pacsize_in > X25_PS4096) 1450 goto out_fac_release; 1451 if (facilities.pacsize_out < X25_PS16 || 1452 facilities.pacsize_out > X25_PS4096) 1453 goto out_fac_release; 1454 if (facilities.winsize_in < 1 || 1455 facilities.winsize_in > 127) 1456 goto out_fac_release; 1457 if (facilities.throughput) { 1458 int out = facilities.throughput & 0xf0; 1459 int in = facilities.throughput & 0x0f; 1460 if (!out) 1461 facilities.throughput |= 1462 X25_DEFAULT_THROUGHPUT << 4; 1463 else if (out < 0x30 || out > 0xD0) 1464 goto out_fac_release; 1465 if (!in) 1466 facilities.throughput |= 1467 X25_DEFAULT_THROUGHPUT; 1468 else if (in < 0x03 || in > 0x0D) 1469 goto out_fac_release; 1470 } 1471 if (facilities.reverse && 1472 (facilities.reverse & 0x81) != 0x81) 1473 goto out_fac_release; 1474 x25->facilities = facilities; 1475 rc = 0; 1476 out_fac_release: 1477 release_sock(sk); 1478 break; 1479 } 1480 1481 case SIOCX25GDTEFACILITIES: { 1482 lock_sock(sk); 1483 rc = copy_to_user(argp, &x25->dte_facilities, 1484 sizeof(x25->dte_facilities)); 1485 release_sock(sk); 1486 if (rc) 1487 rc = -EFAULT; 1488 break; 1489 } 1490 1491 case SIOCX25SDTEFACILITIES: { 1492 struct x25_dte_facilities dtefacs; 1493 rc = -EFAULT; 1494 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1495 break; 1496 rc = -EINVAL; 1497 lock_sock(sk); 1498 if (sk->sk_state != TCP_LISTEN && 1499 sk->sk_state != TCP_CLOSE) 1500 goto out_dtefac_release; 1501 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1502 goto out_dtefac_release; 1503 if (dtefacs.called_len > X25_MAX_AE_LEN) 1504 goto out_dtefac_release; 1505 x25->dte_facilities = dtefacs; 1506 rc = 0; 1507 out_dtefac_release: 1508 release_sock(sk); 1509 break; 1510 } 1511 1512 case SIOCX25GCALLUSERDATA: { 1513 lock_sock(sk); 1514 rc = copy_to_user(argp, &x25->calluserdata, 1515 sizeof(x25->calluserdata)) 1516 ? -EFAULT : 0; 1517 release_sock(sk); 1518 break; 1519 } 1520 1521 case SIOCX25SCALLUSERDATA: { 1522 struct x25_calluserdata calluserdata; 1523 1524 rc = -EFAULT; 1525 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1526 break; 1527 rc = -EINVAL; 1528 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1529 break; 1530 lock_sock(sk); 1531 x25->calluserdata = calluserdata; 1532 release_sock(sk); 1533 rc = 0; 1534 break; 1535 } 1536 1537 case SIOCX25GCAUSEDIAG: { 1538 lock_sock(sk); 1539 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1540 ? -EFAULT : 0; 1541 release_sock(sk); 1542 break; 1543 } 1544 1545 case SIOCX25SCAUSEDIAG: { 1546 struct x25_causediag causediag; 1547 rc = -EFAULT; 1548 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1549 break; 1550 lock_sock(sk); 1551 x25->causediag = causediag; 1552 release_sock(sk); 1553 rc = 0; 1554 break; 1555 1556 } 1557 1558 case SIOCX25SCUDMATCHLEN: { 1559 struct x25_subaddr sub_addr; 1560 rc = -EINVAL; 1561 lock_sock(sk); 1562 if(sk->sk_state != TCP_CLOSE) 1563 goto out_cud_release; 1564 rc = -EFAULT; 1565 if (copy_from_user(&sub_addr, argp, 1566 sizeof(sub_addr))) 1567 goto out_cud_release; 1568 rc = -EINVAL; 1569 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1570 goto out_cud_release; 1571 x25->cudmatchlength = sub_addr.cudmatchlength; 1572 rc = 0; 1573 out_cud_release: 1574 release_sock(sk); 1575 break; 1576 } 1577 1578 case SIOCX25CALLACCPTAPPRV: { 1579 rc = -EINVAL; 1580 lock_sock(sk); 1581 if (sk->sk_state == TCP_CLOSE) { 1582 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1583 rc = 0; 1584 } 1585 release_sock(sk); 1586 break; 1587 } 1588 1589 case SIOCX25SENDCALLACCPT: { 1590 rc = -EINVAL; 1591 lock_sock(sk); 1592 if (sk->sk_state != TCP_ESTABLISHED) 1593 goto out_sendcallaccpt_release; 1594 /* must call accptapprv above */ 1595 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1596 goto out_sendcallaccpt_release; 1597 x25_write_internal(sk, X25_CALL_ACCEPTED); 1598 x25->state = X25_STATE_3; 1599 rc = 0; 1600 out_sendcallaccpt_release: 1601 release_sock(sk); 1602 break; 1603 } 1604 1605 default: 1606 rc = -ENOIOCTLCMD; 1607 break; 1608 } 1609 1610 return rc; 1611 } 1612 1613 static const struct net_proto_family x25_family_ops = { 1614 .family = AF_X25, 1615 .create = x25_create, 1616 .owner = THIS_MODULE, 1617 }; 1618 1619 #ifdef CONFIG_COMPAT 1620 static int compat_x25_subscr_ioctl(unsigned int cmd, 1621 struct compat_x25_subscrip_struct __user *x25_subscr32) 1622 { 1623 struct compat_x25_subscrip_struct x25_subscr; 1624 struct x25_neigh *nb; 1625 struct net_device *dev; 1626 int rc = -EINVAL; 1627 1628 rc = -EFAULT; 1629 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1630 goto out; 1631 1632 rc = -EINVAL; 1633 dev = x25_dev_get(x25_subscr.device); 1634 if (dev == NULL) 1635 goto out; 1636 1637 nb = x25_get_neigh(dev); 1638 if (nb == NULL) 1639 goto out_dev_put; 1640 1641 dev_put(dev); 1642 1643 if (cmd == SIOCX25GSUBSCRIP) { 1644 read_lock_bh(&x25_neigh_list_lock); 1645 x25_subscr.extended = nb->extended; 1646 x25_subscr.global_facil_mask = nb->global_facil_mask; 1647 read_unlock_bh(&x25_neigh_list_lock); 1648 rc = copy_to_user(x25_subscr32, &x25_subscr, 1649 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1650 } else { 1651 rc = -EINVAL; 1652 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1653 rc = 0; 1654 write_lock_bh(&x25_neigh_list_lock); 1655 nb->extended = x25_subscr.extended; 1656 nb->global_facil_mask = x25_subscr.global_facil_mask; 1657 write_unlock_bh(&x25_neigh_list_lock); 1658 } 1659 } 1660 x25_neigh_put(nb); 1661 out: 1662 return rc; 1663 out_dev_put: 1664 dev_put(dev); 1665 goto out; 1666 } 1667 1668 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1669 unsigned long arg) 1670 { 1671 void __user *argp = compat_ptr(arg); 1672 int rc = -ENOIOCTLCMD; 1673 1674 switch(cmd) { 1675 case TIOCOUTQ: 1676 case TIOCINQ: 1677 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1678 break; 1679 case SIOCGIFADDR: 1680 case SIOCSIFADDR: 1681 case SIOCGIFDSTADDR: 1682 case SIOCSIFDSTADDR: 1683 case SIOCGIFBRDADDR: 1684 case SIOCSIFBRDADDR: 1685 case SIOCGIFNETMASK: 1686 case SIOCSIFNETMASK: 1687 case SIOCGIFMETRIC: 1688 case SIOCSIFMETRIC: 1689 rc = -EINVAL; 1690 break; 1691 case SIOCADDRT: 1692 case SIOCDELRT: 1693 rc = -EPERM; 1694 if (!capable(CAP_NET_ADMIN)) 1695 break; 1696 rc = x25_route_ioctl(cmd, argp); 1697 break; 1698 case SIOCX25GSUBSCRIP: 1699 rc = compat_x25_subscr_ioctl(cmd, argp); 1700 break; 1701 case SIOCX25SSUBSCRIP: 1702 rc = -EPERM; 1703 if (!capable(CAP_NET_ADMIN)) 1704 break; 1705 rc = compat_x25_subscr_ioctl(cmd, argp); 1706 break; 1707 case SIOCX25GFACILITIES: 1708 case SIOCX25SFACILITIES: 1709 case SIOCX25GDTEFACILITIES: 1710 case SIOCX25SDTEFACILITIES: 1711 case SIOCX25GCALLUSERDATA: 1712 case SIOCX25SCALLUSERDATA: 1713 case SIOCX25GCAUSEDIAG: 1714 case SIOCX25SCAUSEDIAG: 1715 case SIOCX25SCUDMATCHLEN: 1716 case SIOCX25CALLACCPTAPPRV: 1717 case SIOCX25SENDCALLACCPT: 1718 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1719 break; 1720 default: 1721 rc = -ENOIOCTLCMD; 1722 break; 1723 } 1724 return rc; 1725 } 1726 #endif 1727 1728 static const struct proto_ops x25_proto_ops = { 1729 .family = AF_X25, 1730 .owner = THIS_MODULE, 1731 .release = x25_release, 1732 .bind = x25_bind, 1733 .connect = x25_connect, 1734 .socketpair = sock_no_socketpair, 1735 .accept = x25_accept, 1736 .getname = x25_getname, 1737 .poll = datagram_poll, 1738 .ioctl = x25_ioctl, 1739 #ifdef CONFIG_COMPAT 1740 .compat_ioctl = compat_x25_ioctl, 1741 #endif 1742 .gettstamp = sock_gettstamp, 1743 .listen = x25_listen, 1744 .shutdown = sock_no_shutdown, 1745 .setsockopt = x25_setsockopt, 1746 .getsockopt = x25_getsockopt, 1747 .sendmsg = x25_sendmsg, 1748 .recvmsg = x25_recvmsg, 1749 .mmap = sock_no_mmap, 1750 .sendpage = sock_no_sendpage, 1751 }; 1752 1753 static struct packet_type x25_packet_type __read_mostly = { 1754 .type = cpu_to_be16(ETH_P_X25), 1755 .func = x25_lapb_receive_frame, 1756 }; 1757 1758 static struct notifier_block x25_dev_notifier = { 1759 .notifier_call = x25_device_event, 1760 }; 1761 1762 void x25_kill_by_neigh(struct x25_neigh *nb) 1763 { 1764 struct sock *s; 1765 1766 write_lock_bh(&x25_list_lock); 1767 1768 sk_for_each(s, &x25_list) 1769 if (x25_sk(s)->neighbour == nb) 1770 x25_disconnect(s, ENETUNREACH, 0, 0); 1771 1772 write_unlock_bh(&x25_list_lock); 1773 1774 /* Remove any related forwards */ 1775 x25_clear_forward_by_dev(nb->dev); 1776 } 1777 1778 static int __init x25_init(void) 1779 { 1780 int rc; 1781 1782 rc = proto_register(&x25_proto, 0); 1783 if (rc) 1784 goto out; 1785 1786 rc = sock_register(&x25_family_ops); 1787 if (rc) 1788 goto out_proto; 1789 1790 dev_add_pack(&x25_packet_type); 1791 1792 rc = register_netdevice_notifier(&x25_dev_notifier); 1793 if (rc) 1794 goto out_sock; 1795 1796 rc = x25_register_sysctl(); 1797 if (rc) 1798 goto out_dev; 1799 1800 rc = x25_proc_init(); 1801 if (rc) 1802 goto out_sysctl; 1803 1804 pr_info("Linux Version 0.2\n"); 1805 1806 out: 1807 return rc; 1808 out_sysctl: 1809 x25_unregister_sysctl(); 1810 out_dev: 1811 unregister_netdevice_notifier(&x25_dev_notifier); 1812 out_sock: 1813 dev_remove_pack(&x25_packet_type); 1814 sock_unregister(AF_X25); 1815 out_proto: 1816 proto_unregister(&x25_proto); 1817 goto out; 1818 } 1819 module_init(x25_init); 1820 1821 static void __exit x25_exit(void) 1822 { 1823 x25_proc_exit(); 1824 x25_link_free(); 1825 x25_route_free(); 1826 1827 x25_unregister_sysctl(); 1828 1829 unregister_netdevice_notifier(&x25_dev_notifier); 1830 1831 dev_remove_pack(&x25_packet_type); 1832 1833 sock_unregister(AF_X25); 1834 proto_unregister(&x25_proto); 1835 } 1836 module_exit(x25_exit); 1837 1838 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1839 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1840 MODULE_LICENSE("GPL"); 1841 MODULE_ALIAS_NETPROTO(PF_X25); 1842