1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * X.25 Packet Layer release 002 4 * 5 * This is ALPHA test software. This code may break your machine, 6 * randomly fail to work with new releases, misbehave and/or generally 7 * screw up. It might even work. 8 * 9 * This code REQUIRES 2.1.15 or higher 10 * 11 * History 12 * X.25 001 Jonathan Naylor Started coding. 13 * X.25 002 Jonathan Naylor Centralised disconnect handling. 14 * New timer architecture. 15 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. 16 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of 17 * facilities negotiation and increased 18 * the throughput upper limit. 19 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups 20 * 2000-09-04 Henner Eisen Set sock->state in x25_accept(). 21 * Fixed x25_output() related skb leakage. 22 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. 23 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. 24 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN 25 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to 26 * x25_proc.c, using seq_file 27 * 2005-04-02 Shaun Pereira Selective sub address matching 28 * with call user data 29 * 2005-04-15 Shaun Pereira Fast select with no restriction on 30 * response 31 */ 32 33 #define pr_fmt(fmt) "X25: " fmt 34 35 #include <linux/module.h> 36 #include <linux/capability.h> 37 #include <linux/errno.h> 38 #include <linux/kernel.h> 39 #include <linux/sched/signal.h> 40 #include <linux/timer.h> 41 #include <linux/string.h> 42 #include <linux/net.h> 43 #include <linux/netdevice.h> 44 #include <linux/if_arp.h> 45 #include <linux/skbuff.h> 46 #include <linux/slab.h> 47 #include <net/sock.h> 48 #include <net/tcp_states.h> 49 #include <linux/uaccess.h> 50 #include <linux/fcntl.h> 51 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 52 #include <linux/notifier.h> 53 #include <linux/init.h> 54 #include <linux/compat.h> 55 #include <linux/ctype.h> 56 57 #include <net/x25.h> 58 #include <net/compat.h> 59 60 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 61 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 62 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 63 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 64 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 65 int sysctl_x25_forward = 0; 66 67 HLIST_HEAD(x25_list); 68 DEFINE_RWLOCK(x25_list_lock); 69 70 static const struct proto_ops x25_proto_ops; 71 72 static const struct x25_address null_x25_address = {" "}; 73 74 #ifdef CONFIG_COMPAT 75 struct compat_x25_subscrip_struct { 76 char device[200-sizeof(compat_ulong_t)]; 77 compat_ulong_t global_facil_mask; 78 compat_uint_t extended; 79 }; 80 #endif 81 82 83 int x25_parse_address_block(struct sk_buff *skb, 84 struct x25_address *called_addr, 85 struct x25_address *calling_addr) 86 { 87 unsigned char len; 88 int needed; 89 int rc; 90 91 if (!pskb_may_pull(skb, 1)) { 92 /* packet has no address block */ 93 rc = 0; 94 goto empty; 95 } 96 97 len = *skb->data; 98 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2; 99 100 if (!pskb_may_pull(skb, needed)) { 101 /* packet is too short to hold the addresses it claims 102 to hold */ 103 rc = -1; 104 goto empty; 105 } 106 107 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 108 109 empty: 110 *called_addr->x25_addr = 0; 111 *calling_addr->x25_addr = 0; 112 113 return rc; 114 } 115 116 117 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 118 struct x25_address *calling_addr) 119 { 120 unsigned int called_len, calling_len; 121 char *called, *calling; 122 unsigned int i; 123 124 called_len = (*p >> 0) & 0x0F; 125 calling_len = (*p >> 4) & 0x0F; 126 127 called = called_addr->x25_addr; 128 calling = calling_addr->x25_addr; 129 p++; 130 131 for (i = 0; i < (called_len + calling_len); i++) { 132 if (i < called_len) { 133 if (i % 2 != 0) { 134 *called++ = ((*p >> 0) & 0x0F) + '0'; 135 p++; 136 } else { 137 *called++ = ((*p >> 4) & 0x0F) + '0'; 138 } 139 } else { 140 if (i % 2 != 0) { 141 *calling++ = ((*p >> 0) & 0x0F) + '0'; 142 p++; 143 } else { 144 *calling++ = ((*p >> 4) & 0x0F) + '0'; 145 } 146 } 147 } 148 149 *called = *calling = '\0'; 150 151 return 1 + (called_len + calling_len + 1) / 2; 152 } 153 154 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 155 struct x25_address *calling_addr) 156 { 157 unsigned int called_len, calling_len; 158 char *called, *calling; 159 int i; 160 161 called = called_addr->x25_addr; 162 calling = calling_addr->x25_addr; 163 164 called_len = strlen(called); 165 calling_len = strlen(calling); 166 167 *p++ = (calling_len << 4) | (called_len << 0); 168 169 for (i = 0; i < (called_len + calling_len); i++) { 170 if (i < called_len) { 171 if (i % 2 != 0) { 172 *p |= (*called++ - '0') << 0; 173 p++; 174 } else { 175 *p = 0x00; 176 *p |= (*called++ - '0') << 4; 177 } 178 } else { 179 if (i % 2 != 0) { 180 *p |= (*calling++ - '0') << 0; 181 p++; 182 } else { 183 *p = 0x00; 184 *p |= (*calling++ - '0') << 4; 185 } 186 } 187 } 188 189 return 1 + (called_len + calling_len + 1) / 2; 190 } 191 192 /* 193 * Socket removal during an interrupt is now safe. 194 */ 195 static void x25_remove_socket(struct sock *sk) 196 { 197 write_lock_bh(&x25_list_lock); 198 sk_del_node_init(sk); 199 write_unlock_bh(&x25_list_lock); 200 } 201 202 /* 203 * Kill all bound sockets on a dropped device. 204 */ 205 static void x25_kill_by_device(struct net_device *dev) 206 { 207 struct sock *s; 208 209 write_lock_bh(&x25_list_lock); 210 211 sk_for_each(s, &x25_list) 212 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 213 x25_disconnect(s, ENETUNREACH, 0, 0); 214 215 write_unlock_bh(&x25_list_lock); 216 } 217 218 /* 219 * Handle device status changes. 220 */ 221 static int x25_device_event(struct notifier_block *this, unsigned long event, 222 void *ptr) 223 { 224 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 225 struct x25_neigh *nb; 226 227 if (!net_eq(dev_net(dev), &init_net)) 228 return NOTIFY_DONE; 229 230 if (dev->type == ARPHRD_X25 231 #if IS_ENABLED(CONFIG_LLC) 232 || dev->type == ARPHRD_ETHER 233 #endif 234 ) { 235 switch (event) { 236 case NETDEV_UP: 237 x25_link_device_up(dev); 238 break; 239 case NETDEV_GOING_DOWN: 240 nb = x25_get_neigh(dev); 241 if (nb) { 242 x25_terminate_link(nb); 243 x25_neigh_put(nb); 244 } 245 break; 246 case NETDEV_DOWN: 247 x25_kill_by_device(dev); 248 x25_route_device_down(dev); 249 x25_link_device_down(dev); 250 break; 251 } 252 } 253 254 return NOTIFY_DONE; 255 } 256 257 /* 258 * Add a socket to the bound sockets list. 259 */ 260 static void x25_insert_socket(struct sock *sk) 261 { 262 write_lock_bh(&x25_list_lock); 263 sk_add_node(sk, &x25_list); 264 write_unlock_bh(&x25_list_lock); 265 } 266 267 /* 268 * Find a socket that wants to accept the Call Request we just 269 * received. Check the full list for an address/cud match. 270 * If no cuds match return the next_best thing, an address match. 271 * Note: if a listening socket has cud set it must only get calls 272 * with matching cud. 273 */ 274 static struct sock *x25_find_listener(struct x25_address *addr, 275 struct sk_buff *skb) 276 { 277 struct sock *s; 278 struct sock *next_best; 279 280 read_lock_bh(&x25_list_lock); 281 next_best = NULL; 282 283 sk_for_each(s, &x25_list) 284 if ((!strcmp(addr->x25_addr, 285 x25_sk(s)->source_addr.x25_addr) || 286 !strcmp(x25_sk(s)->source_addr.x25_addr, 287 null_x25_address.x25_addr)) && 288 s->sk_state == TCP_LISTEN) { 289 /* 290 * Found a listening socket, now check the incoming 291 * call user data vs this sockets call user data 292 */ 293 if (x25_sk(s)->cudmatchlength > 0 && 294 skb->len >= x25_sk(s)->cudmatchlength) { 295 if((memcmp(x25_sk(s)->calluserdata.cuddata, 296 skb->data, 297 x25_sk(s)->cudmatchlength)) == 0) { 298 sock_hold(s); 299 goto found; 300 } 301 } else 302 next_best = s; 303 } 304 if (next_best) { 305 s = next_best; 306 sock_hold(s); 307 goto found; 308 } 309 s = NULL; 310 found: 311 read_unlock_bh(&x25_list_lock); 312 return s; 313 } 314 315 /* 316 * Find a connected X.25 socket given my LCI and neighbour. 317 */ 318 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 319 { 320 struct sock *s; 321 322 sk_for_each(s, &x25_list) 323 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 324 sock_hold(s); 325 goto found; 326 } 327 s = NULL; 328 found: 329 return s; 330 } 331 332 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 333 { 334 struct sock *s; 335 336 read_lock_bh(&x25_list_lock); 337 s = __x25_find_socket(lci, nb); 338 read_unlock_bh(&x25_list_lock); 339 return s; 340 } 341 342 /* 343 * Find a unique LCI for a given device. 344 */ 345 static unsigned int x25_new_lci(struct x25_neigh *nb) 346 { 347 unsigned int lci = 1; 348 struct sock *sk; 349 350 while ((sk = x25_find_socket(lci, nb)) != NULL) { 351 sock_put(sk); 352 if (++lci == 4096) { 353 lci = 0; 354 break; 355 } 356 cond_resched(); 357 } 358 359 return lci; 360 } 361 362 /* 363 * Deferred destroy. 364 */ 365 static void __x25_destroy_socket(struct sock *); 366 367 /* 368 * handler for deferred kills. 369 */ 370 static void x25_destroy_timer(struct timer_list *t) 371 { 372 struct sock *sk = from_timer(sk, t, sk_timer); 373 374 x25_destroy_socket_from_timer(sk); 375 } 376 377 /* 378 * This is called from user mode and the timers. Thus it protects itself 379 * against interrupt users but doesn't worry about being called during 380 * work. Once it is removed from the queue no interrupt or bottom half 381 * will touch it and we are (fairly 8-) ) safe. 382 * Not static as it's used by the timer 383 */ 384 static void __x25_destroy_socket(struct sock *sk) 385 { 386 struct sk_buff *skb; 387 388 x25_stop_heartbeat(sk); 389 x25_stop_timer(sk); 390 391 x25_remove_socket(sk); 392 x25_clear_queues(sk); /* Flush the queues */ 393 394 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 395 if (skb->sk != sk) { /* A pending connection */ 396 /* 397 * Queue the unaccepted socket for death 398 */ 399 skb->sk->sk_state = TCP_LISTEN; 400 sock_set_flag(skb->sk, SOCK_DEAD); 401 x25_start_heartbeat(skb->sk); 402 x25_sk(skb->sk)->state = X25_STATE_0; 403 } 404 405 kfree_skb(skb); 406 } 407 408 if (sk_has_allocations(sk)) { 409 /* Defer: outstanding buffers */ 410 sk->sk_timer.expires = jiffies + 10 * HZ; 411 sk->sk_timer.function = x25_destroy_timer; 412 add_timer(&sk->sk_timer); 413 } else { 414 /* drop last reference so sock_put will free */ 415 __sock_put(sk); 416 } 417 } 418 419 void x25_destroy_socket_from_timer(struct sock *sk) 420 { 421 sock_hold(sk); 422 bh_lock_sock(sk); 423 __x25_destroy_socket(sk); 424 bh_unlock_sock(sk); 425 sock_put(sk); 426 } 427 428 /* 429 * Handling for system calls applied via the various interfaces to a 430 * X.25 socket object. 431 */ 432 433 static int x25_setsockopt(struct socket *sock, int level, int optname, 434 sockptr_t optval, unsigned int optlen) 435 { 436 int opt; 437 struct sock *sk = sock->sk; 438 int rc = -ENOPROTOOPT; 439 440 if (level != SOL_X25 || optname != X25_QBITINCL) 441 goto out; 442 443 rc = -EINVAL; 444 if (optlen < sizeof(int)) 445 goto out; 446 447 rc = -EFAULT; 448 if (copy_from_sockptr(&opt, optval, sizeof(int))) 449 goto out; 450 451 if (opt) 452 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 453 else 454 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 455 rc = 0; 456 out: 457 return rc; 458 } 459 460 static int x25_getsockopt(struct socket *sock, int level, int optname, 461 char __user *optval, int __user *optlen) 462 { 463 struct sock *sk = sock->sk; 464 int val, len, rc = -ENOPROTOOPT; 465 466 if (level != SOL_X25 || optname != X25_QBITINCL) 467 goto out; 468 469 rc = -EFAULT; 470 if (get_user(len, optlen)) 471 goto out; 472 473 len = min_t(unsigned int, len, sizeof(int)); 474 475 rc = -EINVAL; 476 if (len < 0) 477 goto out; 478 479 rc = -EFAULT; 480 if (put_user(len, optlen)) 481 goto out; 482 483 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 484 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 485 out: 486 return rc; 487 } 488 489 static int x25_listen(struct socket *sock, int backlog) 490 { 491 struct sock *sk = sock->sk; 492 int rc = -EOPNOTSUPP; 493 494 lock_sock(sk); 495 if (sk->sk_state != TCP_LISTEN) { 496 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 497 sk->sk_max_ack_backlog = backlog; 498 sk->sk_state = TCP_LISTEN; 499 rc = 0; 500 } 501 release_sock(sk); 502 503 return rc; 504 } 505 506 static struct proto x25_proto = { 507 .name = "X25", 508 .owner = THIS_MODULE, 509 .obj_size = sizeof(struct x25_sock), 510 }; 511 512 static struct sock *x25_alloc_socket(struct net *net, int kern) 513 { 514 struct x25_sock *x25; 515 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 516 517 if (!sk) 518 goto out; 519 520 sock_init_data(NULL, sk); 521 522 x25 = x25_sk(sk); 523 skb_queue_head_init(&x25->ack_queue); 524 skb_queue_head_init(&x25->fragment_queue); 525 skb_queue_head_init(&x25->interrupt_in_queue); 526 skb_queue_head_init(&x25->interrupt_out_queue); 527 out: 528 return sk; 529 } 530 531 static int x25_create(struct net *net, struct socket *sock, int protocol, 532 int kern) 533 { 534 struct sock *sk; 535 struct x25_sock *x25; 536 int rc = -EAFNOSUPPORT; 537 538 if (!net_eq(net, &init_net)) 539 goto out; 540 541 rc = -ESOCKTNOSUPPORT; 542 if (sock->type != SOCK_SEQPACKET) 543 goto out; 544 545 rc = -EINVAL; 546 if (protocol) 547 goto out; 548 549 rc = -ENOBUFS; 550 if ((sk = x25_alloc_socket(net, kern)) == NULL) 551 goto out; 552 553 x25 = x25_sk(sk); 554 555 sock_init_data(sock, sk); 556 557 x25_init_timers(sk); 558 559 sock->ops = &x25_proto_ops; 560 sk->sk_protocol = protocol; 561 sk->sk_backlog_rcv = x25_backlog_rcv; 562 563 x25->t21 = sysctl_x25_call_request_timeout; 564 x25->t22 = sysctl_x25_reset_request_timeout; 565 x25->t23 = sysctl_x25_clear_request_timeout; 566 x25->t2 = sysctl_x25_ack_holdback_timeout; 567 x25->state = X25_STATE_0; 568 x25->cudmatchlength = 0; 569 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 570 /* on call accept */ 571 572 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 573 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 574 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 575 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 576 x25->facilities.throughput = 0; /* by default don't negotiate 577 throughput */ 578 x25->facilities.reverse = X25_DEFAULT_REVERSE; 579 x25->dte_facilities.calling_len = 0; 580 x25->dte_facilities.called_len = 0; 581 memset(x25->dte_facilities.called_ae, '\0', 582 sizeof(x25->dte_facilities.called_ae)); 583 memset(x25->dte_facilities.calling_ae, '\0', 584 sizeof(x25->dte_facilities.calling_ae)); 585 586 rc = 0; 587 out: 588 return rc; 589 } 590 591 static struct sock *x25_make_new(struct sock *osk) 592 { 593 struct sock *sk = NULL; 594 struct x25_sock *x25, *ox25; 595 596 if (osk->sk_type != SOCK_SEQPACKET) 597 goto out; 598 599 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 600 goto out; 601 602 x25 = x25_sk(sk); 603 604 sk->sk_type = osk->sk_type; 605 sk->sk_priority = osk->sk_priority; 606 sk->sk_protocol = osk->sk_protocol; 607 sk->sk_rcvbuf = osk->sk_rcvbuf; 608 sk->sk_sndbuf = osk->sk_sndbuf; 609 sk->sk_state = TCP_ESTABLISHED; 610 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 611 sock_copy_flags(sk, osk); 612 613 ox25 = x25_sk(osk); 614 x25->t21 = ox25->t21; 615 x25->t22 = ox25->t22; 616 x25->t23 = ox25->t23; 617 x25->t2 = ox25->t2; 618 x25->flags = ox25->flags; 619 x25->facilities = ox25->facilities; 620 x25->dte_facilities = ox25->dte_facilities; 621 x25->cudmatchlength = ox25->cudmatchlength; 622 623 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 624 x25_init_timers(sk); 625 out: 626 return sk; 627 } 628 629 static int x25_release(struct socket *sock) 630 { 631 struct sock *sk = sock->sk; 632 struct x25_sock *x25; 633 634 if (!sk) 635 return 0; 636 637 x25 = x25_sk(sk); 638 639 sock_hold(sk); 640 lock_sock(sk); 641 switch (x25->state) { 642 643 case X25_STATE_0: 644 case X25_STATE_2: 645 x25_disconnect(sk, 0, 0, 0); 646 __x25_destroy_socket(sk); 647 goto out; 648 649 case X25_STATE_1: 650 case X25_STATE_3: 651 case X25_STATE_4: 652 x25_clear_queues(sk); 653 x25_write_internal(sk, X25_CLEAR_REQUEST); 654 x25_start_t23timer(sk); 655 x25->state = X25_STATE_2; 656 sk->sk_state = TCP_CLOSE; 657 sk->sk_shutdown |= SEND_SHUTDOWN; 658 sk->sk_state_change(sk); 659 sock_set_flag(sk, SOCK_DEAD); 660 sock_set_flag(sk, SOCK_DESTROY); 661 break; 662 663 case X25_STATE_5: 664 x25_write_internal(sk, X25_CLEAR_REQUEST); 665 x25_disconnect(sk, 0, 0, 0); 666 __x25_destroy_socket(sk); 667 goto out; 668 } 669 670 sock_orphan(sk); 671 out: 672 release_sock(sk); 673 sock_put(sk); 674 return 0; 675 } 676 677 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 678 { 679 struct sock *sk = sock->sk; 680 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 681 int len, i, rc = 0; 682 683 if (addr_len != sizeof(struct sockaddr_x25) || 684 addr->sx25_family != AF_X25 || 685 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) { 686 rc = -EINVAL; 687 goto out; 688 } 689 690 /* check for the null_x25_address */ 691 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { 692 693 len = strlen(addr->sx25_addr.x25_addr); 694 for (i = 0; i < len; i++) { 695 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 696 rc = -EINVAL; 697 goto out; 698 } 699 } 700 } 701 702 lock_sock(sk); 703 if (sock_flag(sk, SOCK_ZAPPED)) { 704 x25_sk(sk)->source_addr = addr->sx25_addr; 705 x25_insert_socket(sk); 706 sock_reset_flag(sk, SOCK_ZAPPED); 707 } else { 708 rc = -EINVAL; 709 } 710 release_sock(sk); 711 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 712 out: 713 return rc; 714 } 715 716 static int x25_wait_for_connection_establishment(struct sock *sk) 717 { 718 DECLARE_WAITQUEUE(wait, current); 719 int rc; 720 721 add_wait_queue_exclusive(sk_sleep(sk), &wait); 722 for (;;) { 723 __set_current_state(TASK_INTERRUPTIBLE); 724 rc = -ERESTARTSYS; 725 if (signal_pending(current)) 726 break; 727 rc = sock_error(sk); 728 if (rc) { 729 sk->sk_socket->state = SS_UNCONNECTED; 730 break; 731 } 732 rc = 0; 733 if (sk->sk_state != TCP_ESTABLISHED) { 734 release_sock(sk); 735 schedule(); 736 lock_sock(sk); 737 } else 738 break; 739 } 740 __set_current_state(TASK_RUNNING); 741 remove_wait_queue(sk_sleep(sk), &wait); 742 return rc; 743 } 744 745 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 746 int addr_len, int flags) 747 { 748 struct sock *sk = sock->sk; 749 struct x25_sock *x25 = x25_sk(sk); 750 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 751 struct x25_route *rt; 752 int rc = 0; 753 754 lock_sock(sk); 755 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 756 sock->state = SS_CONNECTED; 757 goto out; /* Connect completed during a ERESTARTSYS event */ 758 } 759 760 rc = -ECONNREFUSED; 761 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 762 sock->state = SS_UNCONNECTED; 763 goto out; 764 } 765 766 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 767 if (sk->sk_state == TCP_ESTABLISHED) 768 goto out; 769 770 rc = -EALREADY; /* Do nothing if call is already in progress */ 771 if (sk->sk_state == TCP_SYN_SENT) 772 goto out; 773 774 sk->sk_state = TCP_CLOSE; 775 sock->state = SS_UNCONNECTED; 776 777 rc = -EINVAL; 778 if (addr_len != sizeof(struct sockaddr_x25) || 779 addr->sx25_family != AF_X25 || 780 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) 781 goto out; 782 783 rc = -ENETUNREACH; 784 rt = x25_get_route(&addr->sx25_addr); 785 if (!rt) 786 goto out; 787 788 x25->neighbour = x25_get_neigh(rt->dev); 789 if (!x25->neighbour) 790 goto out_put_route; 791 792 x25_limit_facilities(&x25->facilities, x25->neighbour); 793 794 x25->lci = x25_new_lci(x25->neighbour); 795 if (!x25->lci) 796 goto out_put_neigh; 797 798 rc = -EINVAL; 799 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 800 goto out_put_neigh; 801 802 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 803 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 804 805 x25->dest_addr = addr->sx25_addr; 806 807 /* Move to connecting socket, start sending Connect Requests */ 808 sock->state = SS_CONNECTING; 809 sk->sk_state = TCP_SYN_SENT; 810 811 x25->state = X25_STATE_1; 812 813 x25_write_internal(sk, X25_CALL_REQUEST); 814 815 x25_start_heartbeat(sk); 816 x25_start_t21timer(sk); 817 818 /* Now the loop */ 819 rc = -EINPROGRESS; 820 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 821 goto out; 822 823 rc = x25_wait_for_connection_establishment(sk); 824 if (rc) 825 goto out_put_neigh; 826 827 sock->state = SS_CONNECTED; 828 rc = 0; 829 out_put_neigh: 830 if (rc && x25->neighbour) { 831 read_lock_bh(&x25_list_lock); 832 x25_neigh_put(x25->neighbour); 833 x25->neighbour = NULL; 834 read_unlock_bh(&x25_list_lock); 835 x25->state = X25_STATE_0; 836 } 837 out_put_route: 838 x25_route_put(rt); 839 out: 840 release_sock(sk); 841 return rc; 842 } 843 844 static int x25_wait_for_data(struct sock *sk, long timeout) 845 { 846 DECLARE_WAITQUEUE(wait, current); 847 int rc = 0; 848 849 add_wait_queue_exclusive(sk_sleep(sk), &wait); 850 for (;;) { 851 __set_current_state(TASK_INTERRUPTIBLE); 852 if (sk->sk_shutdown & RCV_SHUTDOWN) 853 break; 854 rc = -ERESTARTSYS; 855 if (signal_pending(current)) 856 break; 857 rc = -EAGAIN; 858 if (!timeout) 859 break; 860 rc = 0; 861 if (skb_queue_empty(&sk->sk_receive_queue)) { 862 release_sock(sk); 863 timeout = schedule_timeout(timeout); 864 lock_sock(sk); 865 } else 866 break; 867 } 868 __set_current_state(TASK_RUNNING); 869 remove_wait_queue(sk_sleep(sk), &wait); 870 return rc; 871 } 872 873 static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 874 bool kern) 875 { 876 struct sock *sk = sock->sk; 877 struct sock *newsk; 878 struct sk_buff *skb; 879 int rc = -EINVAL; 880 881 if (!sk) 882 goto out; 883 884 rc = -EOPNOTSUPP; 885 if (sk->sk_type != SOCK_SEQPACKET) 886 goto out; 887 888 lock_sock(sk); 889 rc = -EINVAL; 890 if (sk->sk_state != TCP_LISTEN) 891 goto out2; 892 893 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 894 if (rc) 895 goto out2; 896 skb = skb_dequeue(&sk->sk_receive_queue); 897 rc = -EINVAL; 898 if (!skb->sk) 899 goto out2; 900 newsk = skb->sk; 901 sock_graft(newsk, newsock); 902 903 /* Now attach up the new socket */ 904 skb->sk = NULL; 905 kfree_skb(skb); 906 sk_acceptq_removed(sk); 907 newsock->state = SS_CONNECTED; 908 rc = 0; 909 out2: 910 release_sock(sk); 911 out: 912 return rc; 913 } 914 915 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 916 int peer) 917 { 918 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 919 struct sock *sk = sock->sk; 920 struct x25_sock *x25 = x25_sk(sk); 921 int rc = 0; 922 923 if (peer) { 924 if (sk->sk_state != TCP_ESTABLISHED) { 925 rc = -ENOTCONN; 926 goto out; 927 } 928 sx25->sx25_addr = x25->dest_addr; 929 } else 930 sx25->sx25_addr = x25->source_addr; 931 932 sx25->sx25_family = AF_X25; 933 rc = sizeof(*sx25); 934 935 out: 936 return rc; 937 } 938 939 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 940 unsigned int lci) 941 { 942 struct sock *sk; 943 struct sock *make; 944 struct x25_sock *makex25; 945 struct x25_address source_addr, dest_addr; 946 struct x25_facilities facilities; 947 struct x25_dte_facilities dte_facilities; 948 int len, addr_len, rc; 949 950 /* 951 * Remove the LCI and frame type. 952 */ 953 skb_pull(skb, X25_STD_MIN_LEN); 954 955 /* 956 * Extract the X.25 addresses and convert them to ASCII strings, 957 * and remove them. 958 * 959 * Address block is mandatory in call request packets 960 */ 961 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 962 if (addr_len <= 0) 963 goto out_clear_request; 964 skb_pull(skb, addr_len); 965 966 /* 967 * Get the length of the facilities, skip past them for the moment 968 * get the call user data because this is needed to determine 969 * the correct listener 970 * 971 * Facilities length is mandatory in call request packets 972 */ 973 if (!pskb_may_pull(skb, 1)) 974 goto out_clear_request; 975 len = skb->data[0] + 1; 976 if (!pskb_may_pull(skb, len)) 977 goto out_clear_request; 978 skb_pull(skb,len); 979 980 /* 981 * Ensure that the amount of call user data is valid. 982 */ 983 if (skb->len > X25_MAX_CUD_LEN) 984 goto out_clear_request; 985 986 /* 987 * Get all the call user data so it can be used in 988 * x25_find_listener and skb_copy_from_linear_data up ahead. 989 */ 990 if (!pskb_may_pull(skb, skb->len)) 991 goto out_clear_request; 992 993 /* 994 * Find a listener for the particular address/cud pair. 995 */ 996 sk = x25_find_listener(&source_addr,skb); 997 skb_push(skb,len); 998 999 if (sk != NULL && sk_acceptq_is_full(sk)) { 1000 goto out_sock_put; 1001 } 1002 1003 /* 1004 * We dont have any listeners for this incoming call. 1005 * Try forwarding it. 1006 */ 1007 if (sk == NULL) { 1008 skb_push(skb, addr_len + X25_STD_MIN_LEN); 1009 if (sysctl_x25_forward && 1010 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 1011 { 1012 /* Call was forwarded, dont process it any more */ 1013 kfree_skb(skb); 1014 rc = 1; 1015 goto out; 1016 } else { 1017 /* No listeners, can't forward, clear the call */ 1018 goto out_clear_request; 1019 } 1020 } 1021 1022 /* 1023 * Try to reach a compromise on the requested facilities. 1024 */ 1025 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1026 if (len == -1) 1027 goto out_sock_put; 1028 1029 /* 1030 * current neighbour/link might impose additional limits 1031 * on certain facilties 1032 */ 1033 1034 x25_limit_facilities(&facilities, nb); 1035 1036 /* 1037 * Try to create a new socket. 1038 */ 1039 make = x25_make_new(sk); 1040 if (!make) 1041 goto out_sock_put; 1042 1043 /* 1044 * Remove the facilities 1045 */ 1046 skb_pull(skb, len); 1047 1048 skb->sk = make; 1049 make->sk_state = TCP_ESTABLISHED; 1050 1051 makex25 = x25_sk(make); 1052 makex25->lci = lci; 1053 makex25->dest_addr = dest_addr; 1054 makex25->source_addr = source_addr; 1055 x25_neigh_hold(nb); 1056 makex25->neighbour = nb; 1057 makex25->facilities = facilities; 1058 makex25->dte_facilities= dte_facilities; 1059 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1060 /* ensure no reverse facil on accept */ 1061 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1062 /* ensure no calling address extension on accept */ 1063 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1064 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1065 1066 /* Normally all calls are accepted immediately */ 1067 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1068 x25_write_internal(make, X25_CALL_ACCEPTED); 1069 makex25->state = X25_STATE_3; 1070 } else { 1071 makex25->state = X25_STATE_5; 1072 } 1073 1074 /* 1075 * Incoming Call User Data. 1076 */ 1077 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1078 makex25->calluserdata.cudlength = skb->len; 1079 1080 sk_acceptq_added(sk); 1081 1082 x25_insert_socket(make); 1083 1084 skb_queue_head(&sk->sk_receive_queue, skb); 1085 1086 x25_start_heartbeat(make); 1087 1088 if (!sock_flag(sk, SOCK_DEAD)) 1089 sk->sk_data_ready(sk); 1090 rc = 1; 1091 sock_put(sk); 1092 out: 1093 return rc; 1094 out_sock_put: 1095 sock_put(sk); 1096 out_clear_request: 1097 rc = 0; 1098 x25_transmit_clear_request(nb, lci, 0x01); 1099 goto out; 1100 } 1101 1102 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1103 { 1104 struct sock *sk = sock->sk; 1105 struct x25_sock *x25 = x25_sk(sk); 1106 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1107 struct sockaddr_x25 sx25; 1108 struct sk_buff *skb; 1109 unsigned char *asmptr; 1110 int noblock = msg->msg_flags & MSG_DONTWAIT; 1111 size_t size; 1112 int qbit = 0, rc = -EINVAL; 1113 1114 lock_sock(sk); 1115 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1116 goto out; 1117 1118 /* we currently don't support segmented records at the user interface */ 1119 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1120 goto out; 1121 1122 rc = -EADDRNOTAVAIL; 1123 if (sock_flag(sk, SOCK_ZAPPED)) 1124 goto out; 1125 1126 rc = -EPIPE; 1127 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1128 send_sig(SIGPIPE, current, 0); 1129 goto out; 1130 } 1131 1132 rc = -ENETUNREACH; 1133 if (!x25->neighbour) 1134 goto out; 1135 1136 if (usx25) { 1137 rc = -EINVAL; 1138 if (msg->msg_namelen < sizeof(sx25)) 1139 goto out; 1140 memcpy(&sx25, usx25, sizeof(sx25)); 1141 rc = -EISCONN; 1142 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1143 goto out; 1144 rc = -EINVAL; 1145 if (sx25.sx25_family != AF_X25) 1146 goto out; 1147 } else { 1148 /* 1149 * FIXME 1003.1g - if the socket is like this because 1150 * it has become closed (not started closed) we ought 1151 * to SIGPIPE, EPIPE; 1152 */ 1153 rc = -ENOTCONN; 1154 if (sk->sk_state != TCP_ESTABLISHED) 1155 goto out; 1156 1157 sx25.sx25_family = AF_X25; 1158 sx25.sx25_addr = x25->dest_addr; 1159 } 1160 1161 /* Sanity check the packet size */ 1162 if (len > 65535) { 1163 rc = -EMSGSIZE; 1164 goto out; 1165 } 1166 1167 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1168 1169 /* Build a packet */ 1170 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1171 1172 if ((msg->msg_flags & MSG_OOB) && len > 32) 1173 len = 32; 1174 1175 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1176 1177 release_sock(sk); 1178 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1179 lock_sock(sk); 1180 if (!skb) 1181 goto out; 1182 X25_SKB_CB(skb)->flags = msg->msg_flags; 1183 1184 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1185 1186 /* 1187 * Put the data on the end 1188 */ 1189 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1190 1191 skb_reset_transport_header(skb); 1192 skb_put(skb, len); 1193 1194 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1195 if (rc) 1196 goto out_kfree_skb; 1197 1198 /* 1199 * If the Q BIT Include socket option is in force, the first 1200 * byte of the user data is the logical value of the Q Bit. 1201 */ 1202 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1203 if (!pskb_may_pull(skb, 1)) 1204 goto out_kfree_skb; 1205 1206 qbit = skb->data[0]; 1207 skb_pull(skb, 1); 1208 } 1209 1210 /* 1211 * Push down the X.25 header 1212 */ 1213 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1214 1215 if (msg->msg_flags & MSG_OOB) { 1216 if (x25->neighbour->extended) { 1217 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1218 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1219 *asmptr++ = (x25->lci >> 0) & 0xFF; 1220 *asmptr++ = X25_INTERRUPT; 1221 } else { 1222 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1223 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1224 *asmptr++ = (x25->lci >> 0) & 0xFF; 1225 *asmptr++ = X25_INTERRUPT; 1226 } 1227 } else { 1228 if (x25->neighbour->extended) { 1229 /* Build an Extended X.25 header */ 1230 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1231 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1232 *asmptr++ = (x25->lci >> 0) & 0xFF; 1233 *asmptr++ = X25_DATA; 1234 *asmptr++ = X25_DATA; 1235 } else { 1236 /* Build an Standard X.25 header */ 1237 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1238 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1239 *asmptr++ = (x25->lci >> 0) & 0xFF; 1240 *asmptr++ = X25_DATA; 1241 } 1242 1243 if (qbit) 1244 skb->data[0] |= X25_Q_BIT; 1245 } 1246 1247 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1248 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1249 1250 rc = -ENOTCONN; 1251 if (sk->sk_state != TCP_ESTABLISHED) 1252 goto out_kfree_skb; 1253 1254 if (msg->msg_flags & MSG_OOB) 1255 skb_queue_tail(&x25->interrupt_out_queue, skb); 1256 else { 1257 rc = x25_output(sk, skb); 1258 len = rc; 1259 if (rc < 0) 1260 kfree_skb(skb); 1261 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1262 len++; 1263 } 1264 1265 x25_kick(sk); 1266 rc = len; 1267 out: 1268 release_sock(sk); 1269 return rc; 1270 out_kfree_skb: 1271 kfree_skb(skb); 1272 goto out; 1273 } 1274 1275 1276 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1277 int flags) 1278 { 1279 struct sock *sk = sock->sk; 1280 struct x25_sock *x25 = x25_sk(sk); 1281 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1282 size_t copied; 1283 int qbit, header_len; 1284 struct sk_buff *skb; 1285 unsigned char *asmptr; 1286 int rc = -ENOTCONN; 1287 1288 lock_sock(sk); 1289 1290 if (x25->neighbour == NULL) 1291 goto out; 1292 1293 header_len = x25->neighbour->extended ? 1294 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1295 1296 /* 1297 * This works for seqpacket too. The receiver has ordered the queue for 1298 * us! We do one quick check first though 1299 */ 1300 if (sk->sk_state != TCP_ESTABLISHED) 1301 goto out; 1302 1303 if (flags & MSG_OOB) { 1304 rc = -EINVAL; 1305 if (sock_flag(sk, SOCK_URGINLINE) || 1306 !skb_peek(&x25->interrupt_in_queue)) 1307 goto out; 1308 1309 skb = skb_dequeue(&x25->interrupt_in_queue); 1310 1311 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1312 goto out_free_dgram; 1313 1314 skb_pull(skb, X25_STD_MIN_LEN); 1315 1316 /* 1317 * No Q bit information on Interrupt data. 1318 */ 1319 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1320 asmptr = skb_push(skb, 1); 1321 *asmptr = 0x00; 1322 } 1323 1324 msg->msg_flags |= MSG_OOB; 1325 } else { 1326 /* Now we can treat all alike */ 1327 release_sock(sk); 1328 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1329 flags & MSG_DONTWAIT, &rc); 1330 lock_sock(sk); 1331 if (!skb) 1332 goto out; 1333 1334 if (!pskb_may_pull(skb, header_len)) 1335 goto out_free_dgram; 1336 1337 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1338 1339 skb_pull(skb, header_len); 1340 1341 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1342 asmptr = skb_push(skb, 1); 1343 *asmptr = qbit; 1344 } 1345 } 1346 1347 skb_reset_transport_header(skb); 1348 copied = skb->len; 1349 1350 if (copied > size) { 1351 copied = size; 1352 msg->msg_flags |= MSG_TRUNC; 1353 } 1354 1355 /* Currently, each datagram always contains a complete record */ 1356 msg->msg_flags |= MSG_EOR; 1357 1358 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1359 if (rc) 1360 goto out_free_dgram; 1361 1362 if (sx25) { 1363 sx25->sx25_family = AF_X25; 1364 sx25->sx25_addr = x25->dest_addr; 1365 msg->msg_namelen = sizeof(*sx25); 1366 } 1367 1368 x25_check_rbuf(sk); 1369 rc = copied; 1370 out_free_dgram: 1371 skb_free_datagram(sk, skb); 1372 out: 1373 release_sock(sk); 1374 return rc; 1375 } 1376 1377 1378 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1379 { 1380 struct sock *sk = sock->sk; 1381 struct x25_sock *x25 = x25_sk(sk); 1382 void __user *argp = (void __user *)arg; 1383 int rc; 1384 1385 switch (cmd) { 1386 case TIOCOUTQ: { 1387 int amount; 1388 1389 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1390 if (amount < 0) 1391 amount = 0; 1392 rc = put_user(amount, (unsigned int __user *)argp); 1393 break; 1394 } 1395 1396 case TIOCINQ: { 1397 struct sk_buff *skb; 1398 int amount = 0; 1399 /* 1400 * These two are safe on a single CPU system as 1401 * only user tasks fiddle here 1402 */ 1403 lock_sock(sk); 1404 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1405 amount = skb->len; 1406 release_sock(sk); 1407 rc = put_user(amount, (unsigned int __user *)argp); 1408 break; 1409 } 1410 1411 case SIOCGIFADDR: 1412 case SIOCSIFADDR: 1413 case SIOCGIFDSTADDR: 1414 case SIOCSIFDSTADDR: 1415 case SIOCGIFBRDADDR: 1416 case SIOCSIFBRDADDR: 1417 case SIOCGIFNETMASK: 1418 case SIOCSIFNETMASK: 1419 case SIOCGIFMETRIC: 1420 case SIOCSIFMETRIC: 1421 rc = -EINVAL; 1422 break; 1423 case SIOCADDRT: 1424 case SIOCDELRT: 1425 rc = -EPERM; 1426 if (!capable(CAP_NET_ADMIN)) 1427 break; 1428 rc = x25_route_ioctl(cmd, argp); 1429 break; 1430 case SIOCX25GSUBSCRIP: 1431 rc = x25_subscr_ioctl(cmd, argp); 1432 break; 1433 case SIOCX25SSUBSCRIP: 1434 rc = -EPERM; 1435 if (!capable(CAP_NET_ADMIN)) 1436 break; 1437 rc = x25_subscr_ioctl(cmd, argp); 1438 break; 1439 case SIOCX25GFACILITIES: { 1440 lock_sock(sk); 1441 rc = copy_to_user(argp, &x25->facilities, 1442 sizeof(x25->facilities)) 1443 ? -EFAULT : 0; 1444 release_sock(sk); 1445 break; 1446 } 1447 1448 case SIOCX25SFACILITIES: { 1449 struct x25_facilities facilities; 1450 rc = -EFAULT; 1451 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1452 break; 1453 rc = -EINVAL; 1454 lock_sock(sk); 1455 if (sk->sk_state != TCP_LISTEN && 1456 sk->sk_state != TCP_CLOSE) 1457 goto out_fac_release; 1458 if (facilities.pacsize_in < X25_PS16 || 1459 facilities.pacsize_in > X25_PS4096) 1460 goto out_fac_release; 1461 if (facilities.pacsize_out < X25_PS16 || 1462 facilities.pacsize_out > X25_PS4096) 1463 goto out_fac_release; 1464 if (facilities.winsize_in < 1 || 1465 facilities.winsize_in > 127) 1466 goto out_fac_release; 1467 if (facilities.throughput) { 1468 int out = facilities.throughput & 0xf0; 1469 int in = facilities.throughput & 0x0f; 1470 if (!out) 1471 facilities.throughput |= 1472 X25_DEFAULT_THROUGHPUT << 4; 1473 else if (out < 0x30 || out > 0xD0) 1474 goto out_fac_release; 1475 if (!in) 1476 facilities.throughput |= 1477 X25_DEFAULT_THROUGHPUT; 1478 else if (in < 0x03 || in > 0x0D) 1479 goto out_fac_release; 1480 } 1481 if (facilities.reverse && 1482 (facilities.reverse & 0x81) != 0x81) 1483 goto out_fac_release; 1484 x25->facilities = facilities; 1485 rc = 0; 1486 out_fac_release: 1487 release_sock(sk); 1488 break; 1489 } 1490 1491 case SIOCX25GDTEFACILITIES: { 1492 lock_sock(sk); 1493 rc = copy_to_user(argp, &x25->dte_facilities, 1494 sizeof(x25->dte_facilities)); 1495 release_sock(sk); 1496 if (rc) 1497 rc = -EFAULT; 1498 break; 1499 } 1500 1501 case SIOCX25SDTEFACILITIES: { 1502 struct x25_dte_facilities dtefacs; 1503 rc = -EFAULT; 1504 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1505 break; 1506 rc = -EINVAL; 1507 lock_sock(sk); 1508 if (sk->sk_state != TCP_LISTEN && 1509 sk->sk_state != TCP_CLOSE) 1510 goto out_dtefac_release; 1511 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1512 goto out_dtefac_release; 1513 if (dtefacs.called_len > X25_MAX_AE_LEN) 1514 goto out_dtefac_release; 1515 x25->dte_facilities = dtefacs; 1516 rc = 0; 1517 out_dtefac_release: 1518 release_sock(sk); 1519 break; 1520 } 1521 1522 case SIOCX25GCALLUSERDATA: { 1523 lock_sock(sk); 1524 rc = copy_to_user(argp, &x25->calluserdata, 1525 sizeof(x25->calluserdata)) 1526 ? -EFAULT : 0; 1527 release_sock(sk); 1528 break; 1529 } 1530 1531 case SIOCX25SCALLUSERDATA: { 1532 struct x25_calluserdata calluserdata; 1533 1534 rc = -EFAULT; 1535 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1536 break; 1537 rc = -EINVAL; 1538 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1539 break; 1540 lock_sock(sk); 1541 x25->calluserdata = calluserdata; 1542 release_sock(sk); 1543 rc = 0; 1544 break; 1545 } 1546 1547 case SIOCX25GCAUSEDIAG: { 1548 lock_sock(sk); 1549 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1550 ? -EFAULT : 0; 1551 release_sock(sk); 1552 break; 1553 } 1554 1555 case SIOCX25SCAUSEDIAG: { 1556 struct x25_causediag causediag; 1557 rc = -EFAULT; 1558 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1559 break; 1560 lock_sock(sk); 1561 x25->causediag = causediag; 1562 release_sock(sk); 1563 rc = 0; 1564 break; 1565 1566 } 1567 1568 case SIOCX25SCUDMATCHLEN: { 1569 struct x25_subaddr sub_addr; 1570 rc = -EINVAL; 1571 lock_sock(sk); 1572 if(sk->sk_state != TCP_CLOSE) 1573 goto out_cud_release; 1574 rc = -EFAULT; 1575 if (copy_from_user(&sub_addr, argp, 1576 sizeof(sub_addr))) 1577 goto out_cud_release; 1578 rc = -EINVAL; 1579 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1580 goto out_cud_release; 1581 x25->cudmatchlength = sub_addr.cudmatchlength; 1582 rc = 0; 1583 out_cud_release: 1584 release_sock(sk); 1585 break; 1586 } 1587 1588 case SIOCX25CALLACCPTAPPRV: { 1589 rc = -EINVAL; 1590 lock_sock(sk); 1591 if (sk->sk_state == TCP_CLOSE) { 1592 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1593 rc = 0; 1594 } 1595 release_sock(sk); 1596 break; 1597 } 1598 1599 case SIOCX25SENDCALLACCPT: { 1600 rc = -EINVAL; 1601 lock_sock(sk); 1602 if (sk->sk_state != TCP_ESTABLISHED) 1603 goto out_sendcallaccpt_release; 1604 /* must call accptapprv above */ 1605 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1606 goto out_sendcallaccpt_release; 1607 x25_write_internal(sk, X25_CALL_ACCEPTED); 1608 x25->state = X25_STATE_3; 1609 rc = 0; 1610 out_sendcallaccpt_release: 1611 release_sock(sk); 1612 break; 1613 } 1614 1615 default: 1616 rc = -ENOIOCTLCMD; 1617 break; 1618 } 1619 1620 return rc; 1621 } 1622 1623 static const struct net_proto_family x25_family_ops = { 1624 .family = AF_X25, 1625 .create = x25_create, 1626 .owner = THIS_MODULE, 1627 }; 1628 1629 #ifdef CONFIG_COMPAT 1630 static int compat_x25_subscr_ioctl(unsigned int cmd, 1631 struct compat_x25_subscrip_struct __user *x25_subscr32) 1632 { 1633 struct compat_x25_subscrip_struct x25_subscr; 1634 struct x25_neigh *nb; 1635 struct net_device *dev; 1636 int rc = -EINVAL; 1637 1638 rc = -EFAULT; 1639 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1640 goto out; 1641 1642 rc = -EINVAL; 1643 dev = x25_dev_get(x25_subscr.device); 1644 if (dev == NULL) 1645 goto out; 1646 1647 nb = x25_get_neigh(dev); 1648 if (nb == NULL) 1649 goto out_dev_put; 1650 1651 dev_put(dev); 1652 1653 if (cmd == SIOCX25GSUBSCRIP) { 1654 read_lock_bh(&x25_neigh_list_lock); 1655 x25_subscr.extended = nb->extended; 1656 x25_subscr.global_facil_mask = nb->global_facil_mask; 1657 read_unlock_bh(&x25_neigh_list_lock); 1658 rc = copy_to_user(x25_subscr32, &x25_subscr, 1659 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1660 } else { 1661 rc = -EINVAL; 1662 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1663 rc = 0; 1664 write_lock_bh(&x25_neigh_list_lock); 1665 nb->extended = x25_subscr.extended; 1666 nb->global_facil_mask = x25_subscr.global_facil_mask; 1667 write_unlock_bh(&x25_neigh_list_lock); 1668 } 1669 } 1670 x25_neigh_put(nb); 1671 out: 1672 return rc; 1673 out_dev_put: 1674 dev_put(dev); 1675 goto out; 1676 } 1677 1678 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1679 unsigned long arg) 1680 { 1681 void __user *argp = compat_ptr(arg); 1682 int rc = -ENOIOCTLCMD; 1683 1684 switch(cmd) { 1685 case TIOCOUTQ: 1686 case TIOCINQ: 1687 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1688 break; 1689 case SIOCGIFADDR: 1690 case SIOCSIFADDR: 1691 case SIOCGIFDSTADDR: 1692 case SIOCSIFDSTADDR: 1693 case SIOCGIFBRDADDR: 1694 case SIOCSIFBRDADDR: 1695 case SIOCGIFNETMASK: 1696 case SIOCSIFNETMASK: 1697 case SIOCGIFMETRIC: 1698 case SIOCSIFMETRIC: 1699 rc = -EINVAL; 1700 break; 1701 case SIOCADDRT: 1702 case SIOCDELRT: 1703 rc = -EPERM; 1704 if (!capable(CAP_NET_ADMIN)) 1705 break; 1706 rc = x25_route_ioctl(cmd, argp); 1707 break; 1708 case SIOCX25GSUBSCRIP: 1709 rc = compat_x25_subscr_ioctl(cmd, argp); 1710 break; 1711 case SIOCX25SSUBSCRIP: 1712 rc = -EPERM; 1713 if (!capable(CAP_NET_ADMIN)) 1714 break; 1715 rc = compat_x25_subscr_ioctl(cmd, argp); 1716 break; 1717 case SIOCX25GFACILITIES: 1718 case SIOCX25SFACILITIES: 1719 case SIOCX25GDTEFACILITIES: 1720 case SIOCX25SDTEFACILITIES: 1721 case SIOCX25GCALLUSERDATA: 1722 case SIOCX25SCALLUSERDATA: 1723 case SIOCX25GCAUSEDIAG: 1724 case SIOCX25SCAUSEDIAG: 1725 case SIOCX25SCUDMATCHLEN: 1726 case SIOCX25CALLACCPTAPPRV: 1727 case SIOCX25SENDCALLACCPT: 1728 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1729 break; 1730 default: 1731 rc = -ENOIOCTLCMD; 1732 break; 1733 } 1734 return rc; 1735 } 1736 #endif 1737 1738 static const struct proto_ops x25_proto_ops = { 1739 .family = AF_X25, 1740 .owner = THIS_MODULE, 1741 .release = x25_release, 1742 .bind = x25_bind, 1743 .connect = x25_connect, 1744 .socketpair = sock_no_socketpair, 1745 .accept = x25_accept, 1746 .getname = x25_getname, 1747 .poll = datagram_poll, 1748 .ioctl = x25_ioctl, 1749 #ifdef CONFIG_COMPAT 1750 .compat_ioctl = compat_x25_ioctl, 1751 #endif 1752 .gettstamp = sock_gettstamp, 1753 .listen = x25_listen, 1754 .shutdown = sock_no_shutdown, 1755 .setsockopt = x25_setsockopt, 1756 .getsockopt = x25_getsockopt, 1757 .sendmsg = x25_sendmsg, 1758 .recvmsg = x25_recvmsg, 1759 .mmap = sock_no_mmap, 1760 .sendpage = sock_no_sendpage, 1761 }; 1762 1763 static struct packet_type x25_packet_type __read_mostly = { 1764 .type = cpu_to_be16(ETH_P_X25), 1765 .func = x25_lapb_receive_frame, 1766 }; 1767 1768 static struct notifier_block x25_dev_notifier = { 1769 .notifier_call = x25_device_event, 1770 }; 1771 1772 void x25_kill_by_neigh(struct x25_neigh *nb) 1773 { 1774 struct sock *s; 1775 1776 write_lock_bh(&x25_list_lock); 1777 1778 sk_for_each(s, &x25_list) 1779 if (x25_sk(s)->neighbour == nb) 1780 x25_disconnect(s, ENETUNREACH, 0, 0); 1781 1782 write_unlock_bh(&x25_list_lock); 1783 1784 /* Remove any related forwards */ 1785 x25_clear_forward_by_dev(nb->dev); 1786 } 1787 1788 static int __init x25_init(void) 1789 { 1790 int rc; 1791 1792 rc = proto_register(&x25_proto, 0); 1793 if (rc) 1794 goto out; 1795 1796 rc = sock_register(&x25_family_ops); 1797 if (rc) 1798 goto out_proto; 1799 1800 dev_add_pack(&x25_packet_type); 1801 1802 rc = register_netdevice_notifier(&x25_dev_notifier); 1803 if (rc) 1804 goto out_sock; 1805 1806 rc = x25_register_sysctl(); 1807 if (rc) 1808 goto out_dev; 1809 1810 rc = x25_proc_init(); 1811 if (rc) 1812 goto out_sysctl; 1813 1814 pr_info("Linux Version 0.2\n"); 1815 1816 out: 1817 return rc; 1818 out_sysctl: 1819 x25_unregister_sysctl(); 1820 out_dev: 1821 unregister_netdevice_notifier(&x25_dev_notifier); 1822 out_sock: 1823 dev_remove_pack(&x25_packet_type); 1824 sock_unregister(AF_X25); 1825 out_proto: 1826 proto_unregister(&x25_proto); 1827 goto out; 1828 } 1829 module_init(x25_init); 1830 1831 static void __exit x25_exit(void) 1832 { 1833 x25_proc_exit(); 1834 x25_link_free(); 1835 x25_route_free(); 1836 1837 x25_unregister_sysctl(); 1838 1839 unregister_netdevice_notifier(&x25_dev_notifier); 1840 1841 dev_remove_pack(&x25_packet_type); 1842 1843 sock_unregister(AF_X25); 1844 proto_unregister(&x25_proto); 1845 } 1846 module_exit(x25_exit); 1847 1848 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1849 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1850 MODULE_LICENSE("GPL"); 1851 MODULE_ALIAS_NETPROTO(PF_X25); 1852