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 #include <linux/uio.h> 57 58 #include <net/x25.h> 59 #include <net/compat.h> 60 61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 62 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 63 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 64 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 65 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 66 int sysctl_x25_forward = 0; 67 68 HLIST_HEAD(x25_list); 69 DEFINE_RWLOCK(x25_list_lock); 70 71 static const struct proto_ops x25_proto_ops; 72 73 static const struct x25_address null_x25_address = {" "}; 74 75 #ifdef CONFIG_COMPAT 76 struct compat_x25_subscrip_struct { 77 char device[200-sizeof(compat_ulong_t)]; 78 compat_ulong_t global_facil_mask; 79 compat_uint_t extended; 80 }; 81 #endif 82 83 84 int x25_parse_address_block(struct sk_buff *skb, 85 struct x25_address *called_addr, 86 struct x25_address *calling_addr) 87 { 88 unsigned char len; 89 int needed; 90 int rc; 91 92 if (!pskb_may_pull(skb, 1)) { 93 /* packet has no address block */ 94 rc = 0; 95 goto empty; 96 } 97 98 len = *skb->data; 99 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2; 100 101 if (!pskb_may_pull(skb, needed)) { 102 /* packet is too short to hold the addresses it claims 103 to hold */ 104 rc = -1; 105 goto empty; 106 } 107 108 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 109 110 empty: 111 *called_addr->x25_addr = 0; 112 *calling_addr->x25_addr = 0; 113 114 return rc; 115 } 116 117 118 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 119 struct x25_address *calling_addr) 120 { 121 unsigned int called_len, calling_len; 122 char *called, *calling; 123 unsigned int i; 124 125 called_len = (*p >> 0) & 0x0F; 126 calling_len = (*p >> 4) & 0x0F; 127 128 called = called_addr->x25_addr; 129 calling = calling_addr->x25_addr; 130 p++; 131 132 for (i = 0; i < (called_len + calling_len); i++) { 133 if (i < called_len) { 134 if (i % 2 != 0) { 135 *called++ = ((*p >> 0) & 0x0F) + '0'; 136 p++; 137 } else { 138 *called++ = ((*p >> 4) & 0x0F) + '0'; 139 } 140 } else { 141 if (i % 2 != 0) { 142 *calling++ = ((*p >> 0) & 0x0F) + '0'; 143 p++; 144 } else { 145 *calling++ = ((*p >> 4) & 0x0F) + '0'; 146 } 147 } 148 } 149 150 *called = *calling = '\0'; 151 152 return 1 + (called_len + calling_len + 1) / 2; 153 } 154 155 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 156 struct x25_address *calling_addr) 157 { 158 unsigned int called_len, calling_len; 159 char *called, *calling; 160 int i; 161 162 called = called_addr->x25_addr; 163 calling = calling_addr->x25_addr; 164 165 called_len = strlen(called); 166 calling_len = strlen(calling); 167 168 *p++ = (calling_len << 4) | (called_len << 0); 169 170 for (i = 0; i < (called_len + calling_len); i++) { 171 if (i < called_len) { 172 if (i % 2 != 0) { 173 *p |= (*called++ - '0') << 0; 174 p++; 175 } else { 176 *p = 0x00; 177 *p |= (*called++ - '0') << 4; 178 } 179 } else { 180 if (i % 2 != 0) { 181 *p |= (*calling++ - '0') << 0; 182 p++; 183 } else { 184 *p = 0x00; 185 *p |= (*calling++ - '0') << 4; 186 } 187 } 188 } 189 190 return 1 + (called_len + calling_len + 1) / 2; 191 } 192 193 /* 194 * Socket removal during an interrupt is now safe. 195 */ 196 static void x25_remove_socket(struct sock *sk) 197 { 198 write_lock_bh(&x25_list_lock); 199 sk_del_node_init(sk); 200 write_unlock_bh(&x25_list_lock); 201 } 202 203 /* 204 * Handle device status changes. 205 */ 206 static int x25_device_event(struct notifier_block *this, unsigned long event, 207 void *ptr) 208 { 209 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 210 struct x25_neigh *nb; 211 212 if (!net_eq(dev_net(dev), &init_net)) 213 return NOTIFY_DONE; 214 215 if (dev->type == ARPHRD_X25) { 216 switch (event) { 217 case NETDEV_REGISTER: 218 case NETDEV_POST_TYPE_CHANGE: 219 x25_link_device_up(dev); 220 break; 221 case NETDEV_DOWN: 222 nb = x25_get_neigh(dev); 223 if (nb) { 224 x25_link_terminated(nb); 225 x25_neigh_put(nb); 226 } 227 x25_route_device_down(dev); 228 break; 229 case NETDEV_PRE_TYPE_CHANGE: 230 case NETDEV_UNREGISTER: 231 x25_link_device_down(dev); 232 break; 233 case NETDEV_CHANGE: 234 if (!netif_carrier_ok(dev)) { 235 nb = x25_get_neigh(dev); 236 if (nb) { 237 x25_link_terminated(nb); 238 x25_neigh_put(nb); 239 } 240 } 241 break; 242 } 243 } 244 245 return NOTIFY_DONE; 246 } 247 248 /* 249 * Add a socket to the bound sockets list. 250 */ 251 static void x25_insert_socket(struct sock *sk) 252 { 253 write_lock_bh(&x25_list_lock); 254 sk_add_node(sk, &x25_list); 255 write_unlock_bh(&x25_list_lock); 256 } 257 258 /* 259 * Find a socket that wants to accept the Call Request we just 260 * received. Check the full list for an address/cud match. 261 * If no cuds match return the next_best thing, an address match. 262 * Note: if a listening socket has cud set it must only get calls 263 * with matching cud. 264 */ 265 static struct sock *x25_find_listener(struct x25_address *addr, 266 struct sk_buff *skb) 267 { 268 struct sock *s; 269 struct sock *next_best; 270 271 read_lock_bh(&x25_list_lock); 272 next_best = NULL; 273 274 sk_for_each(s, &x25_list) 275 if ((!strcmp(addr->x25_addr, 276 x25_sk(s)->source_addr.x25_addr) || 277 !strcmp(x25_sk(s)->source_addr.x25_addr, 278 null_x25_address.x25_addr)) && 279 s->sk_state == TCP_LISTEN) { 280 /* 281 * Found a listening socket, now check the incoming 282 * call user data vs this sockets call user data 283 */ 284 if (x25_sk(s)->cudmatchlength > 0 && 285 skb->len >= x25_sk(s)->cudmatchlength) { 286 if((memcmp(x25_sk(s)->calluserdata.cuddata, 287 skb->data, 288 x25_sk(s)->cudmatchlength)) == 0) { 289 sock_hold(s); 290 goto found; 291 } 292 } else 293 next_best = s; 294 } 295 if (next_best) { 296 s = next_best; 297 sock_hold(s); 298 goto found; 299 } 300 s = NULL; 301 found: 302 read_unlock_bh(&x25_list_lock); 303 return s; 304 } 305 306 /* 307 * Find a connected X.25 socket given my LCI and neighbour. 308 */ 309 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 310 { 311 struct sock *s; 312 313 sk_for_each(s, &x25_list) 314 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 315 sock_hold(s); 316 goto found; 317 } 318 s = NULL; 319 found: 320 return s; 321 } 322 323 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 324 { 325 struct sock *s; 326 327 read_lock_bh(&x25_list_lock); 328 s = __x25_find_socket(lci, nb); 329 read_unlock_bh(&x25_list_lock); 330 return s; 331 } 332 333 /* 334 * Find a unique LCI for a given device. 335 */ 336 static unsigned int x25_new_lci(struct x25_neigh *nb) 337 { 338 unsigned int lci = 1; 339 struct sock *sk; 340 341 while ((sk = x25_find_socket(lci, nb)) != NULL) { 342 sock_put(sk); 343 if (++lci == 4096) { 344 lci = 0; 345 break; 346 } 347 cond_resched(); 348 } 349 350 return lci; 351 } 352 353 /* 354 * Deferred destroy. 355 */ 356 static void __x25_destroy_socket(struct sock *); 357 358 /* 359 * handler for deferred kills. 360 */ 361 static void x25_destroy_timer(struct timer_list *t) 362 { 363 struct sock *sk = timer_container_of(sk, t, sk_timer); 364 365 x25_destroy_socket_from_timer(sk); 366 sock_put(sk); 367 } 368 369 /* 370 * This is called from user mode and the timers. Thus it protects itself 371 * against interrupting users but doesn't worry about being called during 372 * work. Once it is removed from the queue no interrupt or bottom half 373 * will touch it and we are (fairly 8-) ) safe. 374 * Not static as it's used by the timer 375 */ 376 static void __x25_destroy_socket(struct sock *sk) 377 { 378 struct sk_buff *skb; 379 380 x25_stop_heartbeat(sk); 381 x25_stop_timer(sk); 382 383 x25_remove_socket(sk); 384 x25_clear_queues(sk); /* Flush the queues */ 385 386 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 387 if (skb->sk != sk) { /* A pending connection */ 388 /* 389 * Queue the unaccepted socket for death 390 */ 391 skb->sk->sk_state = TCP_LISTEN; 392 sock_set_flag(skb->sk, SOCK_DEAD); 393 x25_start_heartbeat(skb->sk); 394 x25_sk(skb->sk)->state = X25_STATE_0; 395 } 396 397 kfree_skb(skb); 398 } 399 400 if (sk_has_allocations(sk)) { 401 /* Defer: outstanding buffers */ 402 sk->sk_timer.function = x25_destroy_timer; 403 sk_reset_timer(sk, &sk->sk_timer, jiffies + 10 * HZ); 404 } else { 405 /* drop last reference so sock_put will free */ 406 __sock_put(sk); 407 } 408 } 409 410 void x25_destroy_socket_from_timer(struct sock *sk) 411 { 412 sock_hold(sk); 413 bh_lock_sock(sk); 414 __x25_destroy_socket(sk); 415 bh_unlock_sock(sk); 416 sock_put(sk); 417 } 418 419 /* 420 * Handling for system calls applied via the various interfaces to a 421 * X.25 socket object. 422 */ 423 424 static int x25_setsockopt(struct socket *sock, int level, int optname, 425 sockptr_t optval, unsigned int optlen) 426 { 427 int opt; 428 struct sock *sk = sock->sk; 429 int rc = -ENOPROTOOPT; 430 431 if (level != SOL_X25 || optname != X25_QBITINCL) 432 goto out; 433 434 rc = -EINVAL; 435 if (optlen < sizeof(int)) 436 goto out; 437 438 rc = -EFAULT; 439 if (copy_from_sockptr(&opt, optval, sizeof(int))) 440 goto out; 441 442 assign_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags, opt); 443 rc = 0; 444 out: 445 return rc; 446 } 447 448 static int x25_getsockopt(struct socket *sock, int level, int optname, 449 sockopt_t *opt) 450 { 451 struct sock *sk = sock->sk; 452 int val, len, rc = -ENOPROTOOPT; 453 454 if (level != SOL_X25 || optname != X25_QBITINCL) 455 goto out; 456 457 len = opt->optlen; 458 459 rc = -EINVAL; 460 if (len < 0) 461 goto out; 462 463 len = min_t(unsigned int, len, sizeof(int)); 464 opt->optlen = len; 465 466 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 467 rc = copy_to_iter(&val, len, &opt->iter_out) != len ? -EFAULT : 0; 468 out: 469 return rc; 470 } 471 472 static int x25_listen(struct socket *sock, int backlog) 473 { 474 struct sock *sk = sock->sk; 475 int rc = -EOPNOTSUPP; 476 477 lock_sock(sk); 478 if (sock->state != SS_UNCONNECTED) { 479 rc = -EINVAL; 480 release_sock(sk); 481 return rc; 482 } 483 484 if (sk->sk_state != TCP_LISTEN) { 485 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 486 sk->sk_max_ack_backlog = backlog; 487 sk->sk_state = TCP_LISTEN; 488 rc = 0; 489 } 490 release_sock(sk); 491 492 return rc; 493 } 494 495 static struct proto x25_proto = { 496 .name = "X25", 497 .owner = THIS_MODULE, 498 .obj_size = sizeof(struct x25_sock), 499 }; 500 501 static struct sock *x25_alloc_socket(struct net *net, int kern) 502 { 503 struct x25_sock *x25; 504 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 505 506 if (!sk) 507 goto out; 508 509 sock_init_data(NULL, sk); 510 511 x25 = x25_sk(sk); 512 skb_queue_head_init(&x25->ack_queue); 513 skb_queue_head_init(&x25->fragment_queue); 514 skb_queue_head_init(&x25->interrupt_in_queue); 515 skb_queue_head_init(&x25->interrupt_out_queue); 516 out: 517 return sk; 518 } 519 520 static int x25_create(struct net *net, struct socket *sock, int protocol, 521 int kern) 522 { 523 struct sock *sk; 524 struct x25_sock *x25; 525 int rc = -EAFNOSUPPORT; 526 527 if (!net_eq(net, &init_net)) 528 goto out; 529 530 rc = -ESOCKTNOSUPPORT; 531 if (sock->type != SOCK_SEQPACKET) 532 goto out; 533 534 rc = -EINVAL; 535 if (protocol) 536 goto out; 537 538 rc = -ENOMEM; 539 if ((sk = x25_alloc_socket(net, kern)) == NULL) 540 goto out; 541 542 x25 = x25_sk(sk); 543 544 sock_init_data(sock, sk); 545 546 x25_init_timers(sk); 547 548 sock->ops = &x25_proto_ops; 549 sk->sk_protocol = protocol; 550 sk->sk_backlog_rcv = x25_backlog_rcv; 551 552 x25->t21 = sysctl_x25_call_request_timeout; 553 x25->t22 = sysctl_x25_reset_request_timeout; 554 x25->t23 = sysctl_x25_clear_request_timeout; 555 x25->t2 = sysctl_x25_ack_holdback_timeout; 556 x25->state = X25_STATE_0; 557 x25->cudmatchlength = 0; 558 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 559 /* on call accept */ 560 561 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 562 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 563 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 564 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 565 x25->facilities.throughput = 0; /* by default don't negotiate 566 throughput */ 567 x25->facilities.reverse = X25_DEFAULT_REVERSE; 568 x25->dte_facilities.calling_len = 0; 569 x25->dte_facilities.called_len = 0; 570 memset(x25->dte_facilities.called_ae, '\0', 571 sizeof(x25->dte_facilities.called_ae)); 572 memset(x25->dte_facilities.calling_ae, '\0', 573 sizeof(x25->dte_facilities.calling_ae)); 574 575 rc = 0; 576 out: 577 return rc; 578 } 579 580 static struct sock *x25_make_new(struct sock *osk) 581 { 582 struct sock *sk = NULL; 583 struct x25_sock *x25, *ox25; 584 585 if (osk->sk_type != SOCK_SEQPACKET) 586 goto out; 587 588 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 589 goto out; 590 591 x25 = x25_sk(sk); 592 593 sk->sk_type = osk->sk_type; 594 sk->sk_priority = READ_ONCE(osk->sk_priority); 595 sk->sk_protocol = osk->sk_protocol; 596 sk->sk_rcvbuf = osk->sk_rcvbuf; 597 sk->sk_sndbuf = osk->sk_sndbuf; 598 sk->sk_state = TCP_ESTABLISHED; 599 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 600 sock_copy_flags(sk, osk); 601 602 ox25 = x25_sk(osk); 603 x25->t21 = ox25->t21; 604 x25->t22 = ox25->t22; 605 x25->t23 = ox25->t23; 606 x25->t2 = ox25->t2; 607 x25->flags = ox25->flags; 608 x25->facilities = ox25->facilities; 609 x25->dte_facilities = ox25->dte_facilities; 610 x25->cudmatchlength = ox25->cudmatchlength; 611 612 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 613 x25_init_timers(sk); 614 out: 615 return sk; 616 } 617 618 static int x25_release(struct socket *sock) 619 { 620 struct sock *sk = sock->sk; 621 struct x25_sock *x25; 622 623 if (!sk) 624 return 0; 625 626 x25 = x25_sk(sk); 627 628 sock_hold(sk); 629 lock_sock(sk); 630 switch (x25->state) { 631 632 case X25_STATE_0: 633 case X25_STATE_2: 634 x25_disconnect(sk, 0, 0, 0); 635 __x25_destroy_socket(sk); 636 goto out; 637 638 case X25_STATE_1: 639 case X25_STATE_3: 640 case X25_STATE_4: 641 x25_clear_queues(sk); 642 x25_write_internal(sk, X25_CLEAR_REQUEST); 643 x25_start_t23timer(sk); 644 x25->state = X25_STATE_2; 645 sk->sk_state = TCP_CLOSE; 646 sk->sk_shutdown |= SEND_SHUTDOWN; 647 sk->sk_state_change(sk); 648 sock_set_flag(sk, SOCK_DEAD); 649 sock_set_flag(sk, SOCK_DESTROY); 650 break; 651 652 case X25_STATE_5: 653 x25_write_internal(sk, X25_CLEAR_REQUEST); 654 x25_disconnect(sk, 0, 0, 0); 655 __x25_destroy_socket(sk); 656 goto out; 657 } 658 659 sock_orphan(sk); 660 out: 661 release_sock(sk); 662 sock_put(sk); 663 return 0; 664 } 665 666 static int x25_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len) 667 { 668 struct sock *sk = sock->sk; 669 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 670 int len, i, rc = 0; 671 672 if (addr_len != sizeof(struct sockaddr_x25) || 673 addr->sx25_family != AF_X25 || 674 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) { 675 rc = -EINVAL; 676 goto out; 677 } 678 679 /* check for the null_x25_address */ 680 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { 681 682 len = strlen(addr->sx25_addr.x25_addr); 683 for (i = 0; i < len; i++) { 684 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 685 rc = -EINVAL; 686 goto out; 687 } 688 } 689 } 690 691 lock_sock(sk); 692 if (sock_flag(sk, SOCK_ZAPPED)) { 693 x25_sk(sk)->source_addr = addr->sx25_addr; 694 x25_insert_socket(sk); 695 sock_reset_flag(sk, SOCK_ZAPPED); 696 } else { 697 rc = -EINVAL; 698 } 699 release_sock(sk); 700 net_dbg_ratelimited("x25_bind: socket is bound\n"); 701 out: 702 return rc; 703 } 704 705 static int x25_wait_for_connection_establishment(struct sock *sk) 706 { 707 DECLARE_WAITQUEUE(wait, current); 708 int rc; 709 710 add_wait_queue_exclusive(sk_sleep(sk), &wait); 711 for (;;) { 712 __set_current_state(TASK_INTERRUPTIBLE); 713 rc = -ERESTARTSYS; 714 if (signal_pending(current)) 715 break; 716 rc = sock_error(sk); 717 if (rc) { 718 sk->sk_socket->state = SS_UNCONNECTED; 719 break; 720 } 721 rc = -ENOTCONN; 722 if (sk->sk_state == TCP_CLOSE) { 723 sk->sk_socket->state = SS_UNCONNECTED; 724 break; 725 } 726 rc = 0; 727 if (sk->sk_state != TCP_ESTABLISHED) { 728 release_sock(sk); 729 schedule(); 730 lock_sock(sk); 731 } else 732 break; 733 } 734 __set_current_state(TASK_RUNNING); 735 remove_wait_queue(sk_sleep(sk), &wait); 736 return rc; 737 } 738 739 static int x25_connect(struct socket *sock, struct sockaddr_unsized *uaddr, 740 int addr_len, int flags) 741 { 742 struct sock *sk = sock->sk; 743 struct x25_sock *x25 = x25_sk(sk); 744 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 745 struct x25_route *rt; 746 int rc = 0; 747 748 lock_sock(sk); 749 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 750 sock->state = SS_CONNECTED; 751 goto out; /* Connect completed during a ERESTARTSYS event */ 752 } 753 754 rc = -ECONNREFUSED; 755 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 756 sock->state = SS_UNCONNECTED; 757 goto out; 758 } 759 760 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 761 if (sk->sk_state == TCP_ESTABLISHED) 762 goto out; 763 764 rc = -EALREADY; /* Do nothing if call is already in progress */ 765 if (sk->sk_state == TCP_SYN_SENT) 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 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) 775 goto out; 776 777 rc = -ENETUNREACH; 778 rt = x25_get_route(&addr->sx25_addr); 779 if (!rt) 780 goto out; 781 782 x25->neighbour = x25_get_neigh(rt->dev); 783 if (!x25->neighbour) 784 goto out_put_route; 785 786 x25_limit_facilities(&x25->facilities, x25->neighbour); 787 788 x25->lci = x25_new_lci(x25->neighbour); 789 if (!x25->lci) 790 goto out_put_neigh; 791 792 rc = -EINVAL; 793 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 794 goto out_put_neigh; 795 796 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 797 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 798 799 x25->dest_addr = addr->sx25_addr; 800 801 /* Move to connecting socket, start sending Connect Requests */ 802 sock->state = SS_CONNECTING; 803 sk->sk_state = TCP_SYN_SENT; 804 805 x25->state = X25_STATE_1; 806 807 x25_write_internal(sk, X25_CALL_REQUEST); 808 809 x25_start_heartbeat(sk); 810 x25_start_t21timer(sk); 811 812 /* Now the loop */ 813 rc = -EINPROGRESS; 814 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 815 goto out; 816 817 rc = x25_wait_for_connection_establishment(sk); 818 if (rc) 819 goto out_put_neigh; 820 821 sock->state = SS_CONNECTED; 822 rc = 0; 823 out_put_neigh: 824 if (rc && x25->neighbour) { 825 read_lock_bh(&x25_list_lock); 826 x25_neigh_put(x25->neighbour); 827 x25->neighbour = NULL; 828 read_unlock_bh(&x25_list_lock); 829 x25->state = X25_STATE_0; 830 } 831 out_put_route: 832 x25_route_put(rt); 833 out: 834 release_sock(sk); 835 return rc; 836 } 837 838 static int x25_wait_for_data(struct sock *sk, long timeout) 839 { 840 DECLARE_WAITQUEUE(wait, current); 841 int rc = 0; 842 843 add_wait_queue_exclusive(sk_sleep(sk), &wait); 844 for (;;) { 845 __set_current_state(TASK_INTERRUPTIBLE); 846 if (sk->sk_shutdown & RCV_SHUTDOWN) 847 break; 848 rc = -ERESTARTSYS; 849 if (signal_pending(current)) 850 break; 851 rc = -EAGAIN; 852 if (!timeout) 853 break; 854 rc = 0; 855 if (skb_queue_empty(&sk->sk_receive_queue)) { 856 release_sock(sk); 857 timeout = schedule_timeout(timeout); 858 lock_sock(sk); 859 } else 860 break; 861 } 862 __set_current_state(TASK_RUNNING); 863 remove_wait_queue(sk_sleep(sk), &wait); 864 return rc; 865 } 866 867 static int x25_accept(struct socket *sock, struct socket *newsock, 868 struct proto_accept_arg *arg) 869 { 870 struct sock *sk = sock->sk; 871 struct sock *newsk; 872 struct sk_buff *skb; 873 int rc = -EINVAL; 874 875 if (!sk) 876 goto out; 877 878 rc = -EOPNOTSUPP; 879 if (sk->sk_type != SOCK_SEQPACKET) 880 goto out; 881 882 lock_sock(sk); 883 rc = -EINVAL; 884 if (sk->sk_state != TCP_LISTEN) 885 goto out2; 886 887 rc = x25_wait_for_data(sk, READ_ONCE(sk->sk_rcvtimeo)); 888 if (rc) 889 goto out2; 890 skb = skb_dequeue(&sk->sk_receive_queue); 891 rc = -EINVAL; 892 if (!skb->sk) 893 goto out2; 894 newsk = skb->sk; 895 sock_graft(newsk, newsock); 896 897 /* Now attach up the new socket */ 898 skb->sk = NULL; 899 kfree_skb(skb); 900 sk_acceptq_removed(sk); 901 newsock->state = SS_CONNECTED; 902 rc = 0; 903 out2: 904 release_sock(sk); 905 out: 906 return rc; 907 } 908 909 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 910 int peer) 911 { 912 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 913 struct sock *sk = sock->sk; 914 struct x25_sock *x25 = x25_sk(sk); 915 int rc = 0; 916 917 if (peer) { 918 if (sk->sk_state != TCP_ESTABLISHED) { 919 rc = -ENOTCONN; 920 goto out; 921 } 922 sx25->sx25_addr = x25->dest_addr; 923 } else 924 sx25->sx25_addr = x25->source_addr; 925 926 sx25->sx25_family = AF_X25; 927 rc = sizeof(*sx25); 928 929 out: 930 return rc; 931 } 932 933 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 934 unsigned int lci) 935 { 936 struct sock *sk; 937 struct sock *make; 938 struct x25_sock *makex25; 939 struct x25_address source_addr, dest_addr; 940 struct x25_facilities facilities; 941 struct x25_dte_facilities dte_facilities; 942 int len, addr_len, rc; 943 944 /* 945 * Remove the LCI and frame type. 946 */ 947 skb_pull(skb, X25_STD_MIN_LEN); 948 949 /* 950 * Extract the X.25 addresses and convert them to ASCII strings, 951 * and remove them. 952 * 953 * Address block is mandatory in call request packets 954 */ 955 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 956 if (addr_len <= 0) 957 goto out_clear_request; 958 skb_pull(skb, addr_len); 959 960 /* 961 * Get the length of the facilities, skip past them for the moment 962 * get the call user data because this is needed to determine 963 * the correct listener 964 * 965 * Facilities length is mandatory in call request packets 966 */ 967 if (!pskb_may_pull(skb, 1)) 968 goto out_clear_request; 969 len = skb->data[0] + 1; 970 if (!pskb_may_pull(skb, len)) 971 goto out_clear_request; 972 skb_pull(skb,len); 973 974 /* 975 * Ensure that the amount of call user data is valid. 976 */ 977 if (skb->len > X25_MAX_CUD_LEN) 978 goto out_clear_request; 979 980 /* 981 * Get all the call user data so it can be used in 982 * x25_find_listener and skb_copy_from_linear_data up ahead. 983 */ 984 if (!pskb_may_pull(skb, skb->len)) 985 goto out_clear_request; 986 987 /* 988 * Find a listener for the particular address/cud pair. 989 */ 990 sk = x25_find_listener(&source_addr,skb); 991 skb_push(skb,len); 992 993 if (sk != NULL && sk_acceptq_is_full(sk)) { 994 goto out_sock_put; 995 } 996 997 /* 998 * We dont have any listeners for this incoming call. 999 * Try forwarding it. 1000 */ 1001 if (sk == NULL) { 1002 skb_push(skb, addr_len + X25_STD_MIN_LEN); 1003 if (sysctl_x25_forward && 1004 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 1005 { 1006 /* Call was forwarded, dont process it any more */ 1007 kfree_skb(skb); 1008 rc = 1; 1009 goto out; 1010 } else { 1011 /* No listeners, can't forward, clear the call */ 1012 goto out_clear_request; 1013 } 1014 } 1015 1016 /* 1017 * Try to reach a compromise on the requested facilities. 1018 */ 1019 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1020 if (len == -1) 1021 goto out_sock_put; 1022 1023 /* 1024 * current neighbour/link might impose additional limits 1025 * on certain facilities 1026 */ 1027 1028 x25_limit_facilities(&facilities, nb); 1029 1030 /* 1031 * Try to create a new socket. 1032 */ 1033 make = x25_make_new(sk); 1034 if (!make) 1035 goto out_sock_put; 1036 1037 /* 1038 * Remove the facilities 1039 */ 1040 skb_pull(skb, len); 1041 1042 skb->sk = make; 1043 make->sk_state = TCP_ESTABLISHED; 1044 1045 makex25 = x25_sk(make); 1046 makex25->lci = lci; 1047 makex25->dest_addr = dest_addr; 1048 makex25->source_addr = source_addr; 1049 x25_neigh_hold(nb); 1050 makex25->neighbour = nb; 1051 makex25->facilities = facilities; 1052 makex25->dte_facilities= dte_facilities; 1053 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1054 /* ensure no reverse facil on accept */ 1055 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1056 /* ensure no calling address extension on accept */ 1057 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1058 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1059 1060 /* Normally all calls are accepted immediately */ 1061 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1062 x25_write_internal(make, X25_CALL_ACCEPTED); 1063 makex25->state = X25_STATE_3; 1064 } else { 1065 makex25->state = X25_STATE_5; 1066 } 1067 1068 /* 1069 * Incoming Call User Data. 1070 */ 1071 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1072 makex25->calluserdata.cudlength = skb->len; 1073 1074 sk_acceptq_added(sk); 1075 1076 x25_insert_socket(make); 1077 1078 skb_queue_head(&sk->sk_receive_queue, skb); 1079 1080 x25_start_heartbeat(make); 1081 1082 if (!sock_flag(sk, SOCK_DEAD)) 1083 sk->sk_data_ready(sk); 1084 rc = 1; 1085 sock_put(sk); 1086 out: 1087 return rc; 1088 out_sock_put: 1089 sock_put(sk); 1090 out_clear_request: 1091 rc = 0; 1092 x25_transmit_clear_request(nb, lci, 0x01); 1093 goto out; 1094 } 1095 1096 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1097 { 1098 struct sock *sk = sock->sk; 1099 struct x25_sock *x25 = x25_sk(sk); 1100 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1101 struct sockaddr_x25 sx25; 1102 struct sk_buff *skb; 1103 unsigned char *asmptr; 1104 int noblock = msg->msg_flags & MSG_DONTWAIT; 1105 size_t size; 1106 int qbit = 0, rc = -EINVAL; 1107 1108 lock_sock(sk); 1109 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1110 goto out; 1111 1112 /* we currently don't support segmented records at the user interface */ 1113 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1114 goto out; 1115 1116 rc = -EADDRNOTAVAIL; 1117 if (sock_flag(sk, SOCK_ZAPPED)) 1118 goto out; 1119 1120 rc = -EPIPE; 1121 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1122 send_sig(SIGPIPE, current, 0); 1123 goto out; 1124 } 1125 1126 rc = -ENETUNREACH; 1127 if (!x25->neighbour) 1128 goto out; 1129 1130 if (usx25) { 1131 rc = -EINVAL; 1132 if (msg->msg_namelen < sizeof(sx25)) 1133 goto out; 1134 memcpy(&sx25, usx25, sizeof(sx25)); 1135 rc = -EISCONN; 1136 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1137 goto out; 1138 rc = -EINVAL; 1139 if (sx25.sx25_family != AF_X25) 1140 goto out; 1141 } else { 1142 /* 1143 * FIXME 1003.1g - if the socket is like this because 1144 * it has become closed (not started closed) we ought 1145 * to SIGPIPE, EPIPE; 1146 */ 1147 rc = -ENOTCONN; 1148 if (sk->sk_state != TCP_ESTABLISHED) 1149 goto out; 1150 1151 sx25.sx25_family = AF_X25; 1152 sx25.sx25_addr = x25->dest_addr; 1153 } 1154 1155 /* Sanity check the packet size */ 1156 if (len > 65535) { 1157 rc = -EMSGSIZE; 1158 goto out; 1159 } 1160 1161 net_dbg_ratelimited("x25_sendmsg: sendto: Addresses built.\n"); 1162 1163 /* Build a packet */ 1164 net_dbg_ratelimited("x25_sendmsg: sendto: building packet.\n"); 1165 1166 if ((msg->msg_flags & MSG_OOB) && len > 32) 1167 len = 32; 1168 1169 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1170 1171 release_sock(sk); 1172 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1173 lock_sock(sk); 1174 if (!skb) 1175 goto out; 1176 X25_SKB_CB(skb)->flags = msg->msg_flags; 1177 1178 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1179 1180 /* 1181 * Put the data on the end 1182 */ 1183 net_dbg_ratelimited("x25_sendmsg: Copying user data\n"); 1184 1185 skb_reset_transport_header(skb); 1186 skb_put(skb, len); 1187 1188 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1189 if (rc) 1190 goto out_kfree_skb; 1191 1192 /* 1193 * If the Q BIT Include socket option is in force, the first 1194 * byte of the user data is the logical value of the Q Bit. 1195 */ 1196 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1197 if (!pskb_may_pull(skb, 1)) 1198 goto out_kfree_skb; 1199 1200 qbit = skb->data[0]; 1201 skb_pull(skb, 1); 1202 } 1203 1204 /* 1205 * Push down the X.25 header 1206 */ 1207 net_dbg_ratelimited("x25_sendmsg: Building X.25 Header.\n"); 1208 1209 if (msg->msg_flags & MSG_OOB) { 1210 if (x25->neighbour->extended) { 1211 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1212 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1213 *asmptr++ = (x25->lci >> 0) & 0xFF; 1214 *asmptr++ = X25_INTERRUPT; 1215 } else { 1216 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1217 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1218 *asmptr++ = (x25->lci >> 0) & 0xFF; 1219 *asmptr++ = X25_INTERRUPT; 1220 } 1221 } else { 1222 if (x25->neighbour->extended) { 1223 /* Build an Extended X.25 header */ 1224 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1225 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1226 *asmptr++ = (x25->lci >> 0) & 0xFF; 1227 *asmptr++ = X25_DATA; 1228 *asmptr++ = X25_DATA; 1229 } else { 1230 /* Build an Standard X.25 header */ 1231 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1232 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1233 *asmptr++ = (x25->lci >> 0) & 0xFF; 1234 *asmptr++ = X25_DATA; 1235 } 1236 1237 if (qbit) 1238 skb->data[0] |= X25_Q_BIT; 1239 } 1240 1241 net_dbg_ratelimited("x25_sendmsg: Built header.\n"); 1242 net_dbg_ratelimited("x25_sendmsg: Transmitting buffer\n"); 1243 1244 rc = -ENOTCONN; 1245 if (sk->sk_state != TCP_ESTABLISHED) 1246 goto out_kfree_skb; 1247 1248 if (msg->msg_flags & MSG_OOB) 1249 skb_queue_tail(&x25->interrupt_out_queue, skb); 1250 else { 1251 rc = x25_output(sk, skb); 1252 len = rc; 1253 if (rc < 0) 1254 kfree_skb(skb); 1255 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1256 len++; 1257 } 1258 1259 x25_kick(sk); 1260 rc = len; 1261 out: 1262 release_sock(sk); 1263 return rc; 1264 out_kfree_skb: 1265 kfree_skb(skb); 1266 goto out; 1267 } 1268 1269 1270 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1271 int flags) 1272 { 1273 struct sock *sk = sock->sk; 1274 struct x25_sock *x25 = x25_sk(sk); 1275 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1276 size_t copied; 1277 int qbit, header_len; 1278 struct sk_buff *skb; 1279 unsigned char *asmptr; 1280 int rc = -ENOTCONN; 1281 1282 lock_sock(sk); 1283 1284 if (x25->neighbour == NULL) 1285 goto out; 1286 1287 header_len = x25->neighbour->extended ? 1288 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1289 1290 /* 1291 * This works for seqpacket too. The receiver has ordered the queue for 1292 * us! We do one quick check first though 1293 */ 1294 if (sk->sk_state != TCP_ESTABLISHED) 1295 goto out; 1296 1297 if (flags & MSG_OOB) { 1298 rc = -EINVAL; 1299 if (sock_flag(sk, SOCK_URGINLINE) || 1300 !skb_peek(&x25->interrupt_in_queue)) 1301 goto out; 1302 1303 skb = skb_dequeue(&x25->interrupt_in_queue); 1304 1305 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1306 goto out_free_dgram; 1307 1308 skb_pull(skb, X25_STD_MIN_LEN); 1309 1310 /* 1311 * No Q bit information on Interrupt data. 1312 */ 1313 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1314 asmptr = skb_push(skb, 1); 1315 *asmptr = 0x00; 1316 } 1317 1318 msg->msg_flags |= MSG_OOB; 1319 } else { 1320 /* Now we can treat all alike */ 1321 release_sock(sk); 1322 skb = skb_recv_datagram(sk, flags, &rc); 1323 lock_sock(sk); 1324 if (!skb) 1325 goto out; 1326 1327 if (!pskb_may_pull(skb, header_len)) 1328 goto out_free_dgram; 1329 1330 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1331 1332 skb_pull(skb, header_len); 1333 1334 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1335 asmptr = skb_push(skb, 1); 1336 *asmptr = qbit; 1337 } 1338 } 1339 1340 skb_reset_transport_header(skb); 1341 copied = skb->len; 1342 1343 if (copied > size) { 1344 copied = size; 1345 msg->msg_flags |= MSG_TRUNC; 1346 } 1347 1348 /* Currently, each datagram always contains a complete record */ 1349 msg->msg_flags |= MSG_EOR; 1350 1351 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1352 if (rc) 1353 goto out_free_dgram; 1354 1355 if (sx25) { 1356 sx25->sx25_family = AF_X25; 1357 sx25->sx25_addr = x25->dest_addr; 1358 msg->msg_namelen = sizeof(*sx25); 1359 } 1360 1361 x25_check_rbuf(sk); 1362 rc = copied; 1363 out_free_dgram: 1364 skb_free_datagram(sk, skb); 1365 out: 1366 release_sock(sk); 1367 return rc; 1368 } 1369 1370 1371 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1372 { 1373 struct sock *sk = sock->sk; 1374 struct x25_sock *x25 = x25_sk(sk); 1375 void __user *argp = (void __user *)arg; 1376 int rc; 1377 1378 switch (cmd) { 1379 case TIOCOUTQ: { 1380 int amount; 1381 1382 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1383 if (amount < 0) 1384 amount = 0; 1385 rc = put_user(amount, (unsigned int __user *)argp); 1386 break; 1387 } 1388 1389 case TIOCINQ: { 1390 struct sk_buff *skb; 1391 int amount = 0; 1392 /* 1393 * These two are safe on a single CPU system as 1394 * only user tasks fiddle here 1395 */ 1396 lock_sock(sk); 1397 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1398 amount = skb->len; 1399 release_sock(sk); 1400 rc = put_user(amount, (unsigned int __user *)argp); 1401 break; 1402 } 1403 1404 case SIOCGIFADDR: 1405 case SIOCSIFADDR: 1406 case SIOCGIFDSTADDR: 1407 case SIOCSIFDSTADDR: 1408 case SIOCGIFBRDADDR: 1409 case SIOCSIFBRDADDR: 1410 case SIOCGIFNETMASK: 1411 case SIOCSIFNETMASK: 1412 case SIOCGIFMETRIC: 1413 case SIOCSIFMETRIC: 1414 rc = -EINVAL; 1415 break; 1416 case SIOCADDRT: 1417 case SIOCDELRT: 1418 rc = -EPERM; 1419 if (!capable(CAP_NET_ADMIN)) 1420 break; 1421 rc = x25_route_ioctl(cmd, argp); 1422 break; 1423 case SIOCX25GSUBSCRIP: 1424 rc = x25_subscr_ioctl(cmd, argp); 1425 break; 1426 case SIOCX25SSUBSCRIP: 1427 rc = -EPERM; 1428 if (!capable(CAP_NET_ADMIN)) 1429 break; 1430 rc = x25_subscr_ioctl(cmd, argp); 1431 break; 1432 case SIOCX25GFACILITIES: { 1433 lock_sock(sk); 1434 rc = copy_to_user(argp, &x25->facilities, 1435 sizeof(x25->facilities)) 1436 ? -EFAULT : 0; 1437 release_sock(sk); 1438 break; 1439 } 1440 1441 case SIOCX25SFACILITIES: { 1442 struct x25_facilities facilities; 1443 rc = -EFAULT; 1444 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1445 break; 1446 rc = -EINVAL; 1447 lock_sock(sk); 1448 if (sk->sk_state != TCP_LISTEN && 1449 sk->sk_state != TCP_CLOSE) 1450 goto out_fac_release; 1451 if (facilities.pacsize_in < X25_PS16 || 1452 facilities.pacsize_in > X25_PS4096) 1453 goto out_fac_release; 1454 if (facilities.pacsize_out < X25_PS16 || 1455 facilities.pacsize_out > X25_PS4096) 1456 goto out_fac_release; 1457 if (facilities.winsize_in < 1 || 1458 facilities.winsize_in > 127) 1459 goto out_fac_release; 1460 if (facilities.throughput) { 1461 int out = facilities.throughput & 0xf0; 1462 int in = facilities.throughput & 0x0f; 1463 if (!out) 1464 facilities.throughput |= 1465 X25_DEFAULT_THROUGHPUT << 4; 1466 else if (out < 0x30 || out > 0xD0) 1467 goto out_fac_release; 1468 if (!in) 1469 facilities.throughput |= 1470 X25_DEFAULT_THROUGHPUT; 1471 else if (in < 0x03 || in > 0x0D) 1472 goto out_fac_release; 1473 } 1474 if (facilities.reverse && 1475 (facilities.reverse & 0x81) != 0x81) 1476 goto out_fac_release; 1477 x25->facilities = facilities; 1478 rc = 0; 1479 out_fac_release: 1480 release_sock(sk); 1481 break; 1482 } 1483 1484 case SIOCX25GDTEFACILITIES: { 1485 lock_sock(sk); 1486 rc = copy_to_user(argp, &x25->dte_facilities, 1487 sizeof(x25->dte_facilities)); 1488 release_sock(sk); 1489 if (rc) 1490 rc = -EFAULT; 1491 break; 1492 } 1493 1494 case SIOCX25SDTEFACILITIES: { 1495 struct x25_dte_facilities dtefacs; 1496 rc = -EFAULT; 1497 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1498 break; 1499 rc = -EINVAL; 1500 lock_sock(sk); 1501 if (sk->sk_state != TCP_LISTEN && 1502 sk->sk_state != TCP_CLOSE) 1503 goto out_dtefac_release; 1504 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1505 goto out_dtefac_release; 1506 if (dtefacs.called_len > X25_MAX_AE_LEN) 1507 goto out_dtefac_release; 1508 x25->dte_facilities = dtefacs; 1509 rc = 0; 1510 out_dtefac_release: 1511 release_sock(sk); 1512 break; 1513 } 1514 1515 case SIOCX25GCALLUSERDATA: { 1516 lock_sock(sk); 1517 rc = copy_to_user(argp, &x25->calluserdata, 1518 sizeof(x25->calluserdata)) 1519 ? -EFAULT : 0; 1520 release_sock(sk); 1521 break; 1522 } 1523 1524 case SIOCX25SCALLUSERDATA: { 1525 struct x25_calluserdata calluserdata; 1526 1527 rc = -EFAULT; 1528 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1529 break; 1530 rc = -EINVAL; 1531 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1532 break; 1533 lock_sock(sk); 1534 x25->calluserdata = calluserdata; 1535 release_sock(sk); 1536 rc = 0; 1537 break; 1538 } 1539 1540 case SIOCX25GCAUSEDIAG: { 1541 lock_sock(sk); 1542 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1543 ? -EFAULT : 0; 1544 release_sock(sk); 1545 break; 1546 } 1547 1548 case SIOCX25SCAUSEDIAG: { 1549 struct x25_causediag causediag; 1550 rc = -EFAULT; 1551 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1552 break; 1553 lock_sock(sk); 1554 x25->causediag = causediag; 1555 release_sock(sk); 1556 rc = 0; 1557 break; 1558 1559 } 1560 1561 case SIOCX25SCUDMATCHLEN: { 1562 struct x25_subaddr sub_addr; 1563 rc = -EINVAL; 1564 lock_sock(sk); 1565 if(sk->sk_state != TCP_CLOSE) 1566 goto out_cud_release; 1567 rc = -EFAULT; 1568 if (copy_from_user(&sub_addr, argp, 1569 sizeof(sub_addr))) 1570 goto out_cud_release; 1571 rc = -EINVAL; 1572 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1573 goto out_cud_release; 1574 x25->cudmatchlength = sub_addr.cudmatchlength; 1575 rc = 0; 1576 out_cud_release: 1577 release_sock(sk); 1578 break; 1579 } 1580 1581 case SIOCX25CALLACCPTAPPRV: { 1582 rc = -EINVAL; 1583 lock_sock(sk); 1584 if (sk->sk_state == TCP_CLOSE) { 1585 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1586 rc = 0; 1587 } 1588 release_sock(sk); 1589 break; 1590 } 1591 1592 case SIOCX25SENDCALLACCPT: { 1593 rc = -EINVAL; 1594 lock_sock(sk); 1595 if (sk->sk_state != TCP_ESTABLISHED) 1596 goto out_sendcallaccpt_release; 1597 /* must call accptapprv above */ 1598 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1599 goto out_sendcallaccpt_release; 1600 x25_write_internal(sk, X25_CALL_ACCEPTED); 1601 x25->state = X25_STATE_3; 1602 rc = 0; 1603 out_sendcallaccpt_release: 1604 release_sock(sk); 1605 break; 1606 } 1607 1608 default: 1609 rc = -ENOIOCTLCMD; 1610 break; 1611 } 1612 1613 return rc; 1614 } 1615 1616 static const struct net_proto_family x25_family_ops = { 1617 .family = AF_X25, 1618 .create = x25_create, 1619 .owner = THIS_MODULE, 1620 }; 1621 1622 #ifdef CONFIG_COMPAT 1623 static int compat_x25_subscr_ioctl(unsigned int cmd, 1624 struct compat_x25_subscrip_struct __user *x25_subscr32) 1625 { 1626 struct compat_x25_subscrip_struct x25_subscr; 1627 struct x25_neigh *nb; 1628 struct net_device *dev; 1629 int rc = -EINVAL; 1630 1631 rc = -EFAULT; 1632 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1633 goto out; 1634 1635 rc = -EINVAL; 1636 dev = x25_dev_get(x25_subscr.device); 1637 if (dev == NULL) 1638 goto out; 1639 1640 nb = x25_get_neigh(dev); 1641 if (nb == NULL) 1642 goto out_dev_put; 1643 1644 dev_put(dev); 1645 1646 if (cmd == SIOCX25GSUBSCRIP) { 1647 read_lock_bh(&x25_neigh_list_lock); 1648 x25_subscr.extended = nb->extended; 1649 x25_subscr.global_facil_mask = nb->global_facil_mask; 1650 read_unlock_bh(&x25_neigh_list_lock); 1651 rc = copy_to_user(x25_subscr32, &x25_subscr, 1652 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1653 } else { 1654 rc = -EINVAL; 1655 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1656 rc = 0; 1657 write_lock_bh(&x25_neigh_list_lock); 1658 nb->extended = x25_subscr.extended; 1659 nb->global_facil_mask = x25_subscr.global_facil_mask; 1660 write_unlock_bh(&x25_neigh_list_lock); 1661 } 1662 } 1663 x25_neigh_put(nb); 1664 out: 1665 return rc; 1666 out_dev_put: 1667 dev_put(dev); 1668 goto out; 1669 } 1670 1671 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1672 unsigned long arg) 1673 { 1674 void __user *argp = compat_ptr(arg); 1675 int rc = -ENOIOCTLCMD; 1676 1677 switch(cmd) { 1678 case TIOCOUTQ: 1679 case TIOCINQ: 1680 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1681 break; 1682 case SIOCGIFADDR: 1683 case SIOCSIFADDR: 1684 case SIOCGIFDSTADDR: 1685 case SIOCSIFDSTADDR: 1686 case SIOCGIFBRDADDR: 1687 case SIOCSIFBRDADDR: 1688 case SIOCGIFNETMASK: 1689 case SIOCSIFNETMASK: 1690 case SIOCGIFMETRIC: 1691 case SIOCSIFMETRIC: 1692 rc = -EINVAL; 1693 break; 1694 case SIOCADDRT: 1695 case SIOCDELRT: 1696 rc = -EPERM; 1697 if (!capable(CAP_NET_ADMIN)) 1698 break; 1699 rc = x25_route_ioctl(cmd, argp); 1700 break; 1701 case SIOCX25GSUBSCRIP: 1702 rc = compat_x25_subscr_ioctl(cmd, argp); 1703 break; 1704 case SIOCX25SSUBSCRIP: 1705 rc = -EPERM; 1706 if (!capable(CAP_NET_ADMIN)) 1707 break; 1708 rc = compat_x25_subscr_ioctl(cmd, argp); 1709 break; 1710 case SIOCX25GFACILITIES: 1711 case SIOCX25SFACILITIES: 1712 case SIOCX25GDTEFACILITIES: 1713 case SIOCX25SDTEFACILITIES: 1714 case SIOCX25GCALLUSERDATA: 1715 case SIOCX25SCALLUSERDATA: 1716 case SIOCX25GCAUSEDIAG: 1717 case SIOCX25SCAUSEDIAG: 1718 case SIOCX25SCUDMATCHLEN: 1719 case SIOCX25CALLACCPTAPPRV: 1720 case SIOCX25SENDCALLACCPT: 1721 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1722 break; 1723 default: 1724 rc = -ENOIOCTLCMD; 1725 break; 1726 } 1727 return rc; 1728 } 1729 #endif 1730 1731 static const struct proto_ops x25_proto_ops = { 1732 .family = AF_X25, 1733 .owner = THIS_MODULE, 1734 .release = x25_release, 1735 .bind = x25_bind, 1736 .connect = x25_connect, 1737 .socketpair = sock_no_socketpair, 1738 .accept = x25_accept, 1739 .getname = x25_getname, 1740 .poll = datagram_poll, 1741 .ioctl = x25_ioctl, 1742 #ifdef CONFIG_COMPAT 1743 .compat_ioctl = compat_x25_ioctl, 1744 #endif 1745 .gettstamp = sock_gettstamp, 1746 .listen = x25_listen, 1747 .shutdown = sock_no_shutdown, 1748 .setsockopt = x25_setsockopt, 1749 .getsockopt_iter = x25_getsockopt, 1750 .sendmsg = x25_sendmsg, 1751 .recvmsg = x25_recvmsg, 1752 .mmap = sock_no_mmap, 1753 }; 1754 1755 static struct packet_type x25_packet_type __read_mostly = { 1756 .type = cpu_to_be16(ETH_P_X25), 1757 .func = x25_lapb_receive_frame, 1758 }; 1759 1760 static struct notifier_block x25_dev_notifier = { 1761 .notifier_call = x25_device_event, 1762 }; 1763 1764 void x25_kill_by_neigh(struct x25_neigh *nb) 1765 { 1766 struct sock *s; 1767 1768 again: 1769 write_lock_bh(&x25_list_lock); 1770 1771 sk_for_each(s, &x25_list) { 1772 if (x25_sk(s)->neighbour == nb) { 1773 sock_hold(s); 1774 write_unlock_bh(&x25_list_lock); 1775 lock_sock(s); 1776 if (x25_sk(s)->neighbour == nb) 1777 x25_disconnect(s, ENETUNREACH, 0, 0); 1778 release_sock(s); 1779 sock_put(s); 1780 goto again; 1781 } 1782 } 1783 write_unlock_bh(&x25_list_lock); 1784 1785 /* Remove any related forwards */ 1786 x25_clear_forward_by_dev(nb->dev); 1787 } 1788 1789 static int __init x25_init(void) 1790 { 1791 int rc; 1792 1793 rc = proto_register(&x25_proto, 0); 1794 if (rc) 1795 goto out; 1796 1797 rc = sock_register(&x25_family_ops); 1798 if (rc) 1799 goto out_proto; 1800 1801 dev_add_pack(&x25_packet_type); 1802 1803 rc = register_netdevice_notifier(&x25_dev_notifier); 1804 if (rc) 1805 goto out_sock; 1806 1807 rc = x25_register_sysctl(); 1808 if (rc) 1809 goto out_dev; 1810 1811 rc = x25_proc_init(); 1812 if (rc) 1813 goto out_sysctl; 1814 1815 pr_info("Linux Version 0.2\n"); 1816 1817 out: 1818 return rc; 1819 out_sysctl: 1820 x25_unregister_sysctl(); 1821 out_dev: 1822 unregister_netdevice_notifier(&x25_dev_notifier); 1823 out_sock: 1824 dev_remove_pack(&x25_packet_type); 1825 sock_unregister(AF_X25); 1826 out_proto: 1827 proto_unregister(&x25_proto); 1828 goto out; 1829 } 1830 module_init(x25_init); 1831 1832 static void __exit x25_exit(void) 1833 { 1834 x25_proc_exit(); 1835 x25_link_free(); 1836 x25_route_free(); 1837 1838 x25_unregister_sysctl(); 1839 1840 unregister_netdevice_notifier(&x25_dev_notifier); 1841 1842 dev_remove_pack(&x25_packet_type); 1843 1844 sock_unregister(AF_X25); 1845 proto_unregister(&x25_proto); 1846 } 1847 module_exit(x25_exit); 1848 1849 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1850 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1851 MODULE_LICENSE("GPL"); 1852 MODULE_ALIAS_NETPROTO(PF_X25); 1853