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 * Handle device status changes. 204 */ 205 static int x25_device_event(struct notifier_block *this, unsigned long event, 206 void *ptr) 207 { 208 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 209 struct x25_neigh *nb; 210 211 if (!net_eq(dev_net(dev), &init_net)) 212 return NOTIFY_DONE; 213 214 if (dev->type == ARPHRD_X25) { 215 switch (event) { 216 case NETDEV_REGISTER: 217 case NETDEV_POST_TYPE_CHANGE: 218 x25_link_device_up(dev); 219 break; 220 case NETDEV_DOWN: 221 nb = x25_get_neigh(dev); 222 if (nb) { 223 x25_link_terminated(nb); 224 x25_neigh_put(nb); 225 } 226 x25_route_device_down(dev); 227 break; 228 case NETDEV_PRE_TYPE_CHANGE: 229 case NETDEV_UNREGISTER: 230 x25_link_device_down(dev); 231 break; 232 case NETDEV_CHANGE: 233 if (!netif_carrier_ok(dev)) { 234 nb = x25_get_neigh(dev); 235 if (nb) { 236 x25_link_terminated(nb); 237 x25_neigh_put(nb); 238 } 239 } 240 break; 241 } 242 } 243 244 return NOTIFY_DONE; 245 } 246 247 /* 248 * Add a socket to the bound sockets list. 249 */ 250 static void x25_insert_socket(struct sock *sk) 251 { 252 write_lock_bh(&x25_list_lock); 253 sk_add_node(sk, &x25_list); 254 write_unlock_bh(&x25_list_lock); 255 } 256 257 /* 258 * Find a socket that wants to accept the Call Request we just 259 * received. Check the full list for an address/cud match. 260 * If no cuds match return the next_best thing, an address match. 261 * Note: if a listening socket has cud set it must only get calls 262 * with matching cud. 263 */ 264 static struct sock *x25_find_listener(struct x25_address *addr, 265 struct sk_buff *skb) 266 { 267 struct sock *s; 268 struct sock *next_best; 269 270 read_lock_bh(&x25_list_lock); 271 next_best = NULL; 272 273 sk_for_each(s, &x25_list) 274 if ((!strcmp(addr->x25_addr, 275 x25_sk(s)->source_addr.x25_addr) || 276 !strcmp(x25_sk(s)->source_addr.x25_addr, 277 null_x25_address.x25_addr)) && 278 s->sk_state == TCP_LISTEN) { 279 /* 280 * Found a listening socket, now check the incoming 281 * call user data vs this sockets call user data 282 */ 283 if (x25_sk(s)->cudmatchlength > 0 && 284 skb->len >= x25_sk(s)->cudmatchlength) { 285 if((memcmp(x25_sk(s)->calluserdata.cuddata, 286 skb->data, 287 x25_sk(s)->cudmatchlength)) == 0) { 288 sock_hold(s); 289 goto found; 290 } 291 } else 292 next_best = s; 293 } 294 if (next_best) { 295 s = next_best; 296 sock_hold(s); 297 goto found; 298 } 299 s = NULL; 300 found: 301 read_unlock_bh(&x25_list_lock); 302 return s; 303 } 304 305 /* 306 * Find a connected X.25 socket given my LCI and neighbour. 307 */ 308 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 309 { 310 struct sock *s; 311 312 sk_for_each(s, &x25_list) 313 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 314 sock_hold(s); 315 goto found; 316 } 317 s = NULL; 318 found: 319 return s; 320 } 321 322 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 323 { 324 struct sock *s; 325 326 read_lock_bh(&x25_list_lock); 327 s = __x25_find_socket(lci, nb); 328 read_unlock_bh(&x25_list_lock); 329 return s; 330 } 331 332 /* 333 * Find a unique LCI for a given device. 334 */ 335 static unsigned int x25_new_lci(struct x25_neigh *nb) 336 { 337 unsigned int lci = 1; 338 struct sock *sk; 339 340 while ((sk = x25_find_socket(lci, nb)) != NULL) { 341 sock_put(sk); 342 if (++lci == 4096) { 343 lci = 0; 344 break; 345 } 346 cond_resched(); 347 } 348 349 return lci; 350 } 351 352 /* 353 * Deferred destroy. 354 */ 355 static void __x25_destroy_socket(struct sock *); 356 357 /* 358 * handler for deferred kills. 359 */ 360 static void x25_destroy_timer(struct timer_list *t) 361 { 362 struct sock *sk = from_timer(sk, t, sk_timer); 363 364 x25_destroy_socket_from_timer(sk); 365 } 366 367 /* 368 * This is called from user mode and the timers. Thus it protects itself 369 * against interrupting users but doesn't worry about being called during 370 * work. Once it is removed from the queue no interrupt or bottom half 371 * will touch it and we are (fairly 8-) ) safe. 372 * Not static as it's used by the timer 373 */ 374 static void __x25_destroy_socket(struct sock *sk) 375 { 376 struct sk_buff *skb; 377 378 x25_stop_heartbeat(sk); 379 x25_stop_timer(sk); 380 381 x25_remove_socket(sk); 382 x25_clear_queues(sk); /* Flush the queues */ 383 384 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 385 if (skb->sk != sk) { /* A pending connection */ 386 /* 387 * Queue the unaccepted socket for death 388 */ 389 skb->sk->sk_state = TCP_LISTEN; 390 sock_set_flag(skb->sk, SOCK_DEAD); 391 x25_start_heartbeat(skb->sk); 392 x25_sk(skb->sk)->state = X25_STATE_0; 393 } 394 395 kfree_skb(skb); 396 } 397 398 if (sk_has_allocations(sk)) { 399 /* Defer: outstanding buffers */ 400 sk->sk_timer.expires = jiffies + 10 * HZ; 401 sk->sk_timer.function = x25_destroy_timer; 402 add_timer(&sk->sk_timer); 403 } else { 404 /* drop last reference so sock_put will free */ 405 __sock_put(sk); 406 } 407 } 408 409 void x25_destroy_socket_from_timer(struct sock *sk) 410 { 411 sock_hold(sk); 412 bh_lock_sock(sk); 413 __x25_destroy_socket(sk); 414 bh_unlock_sock(sk); 415 sock_put(sk); 416 } 417 418 /* 419 * Handling for system calls applied via the various interfaces to a 420 * X.25 socket object. 421 */ 422 423 static int x25_setsockopt(struct socket *sock, int level, int optname, 424 sockptr_t optval, unsigned int optlen) 425 { 426 int opt; 427 struct sock *sk = sock->sk; 428 int rc = -ENOPROTOOPT; 429 430 if (level != SOL_X25 || optname != X25_QBITINCL) 431 goto out; 432 433 rc = -EINVAL; 434 if (optlen < sizeof(int)) 435 goto out; 436 437 rc = -EFAULT; 438 if (copy_from_sockptr(&opt, optval, sizeof(int))) 439 goto out; 440 441 if (opt) 442 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 443 else 444 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 445 rc = 0; 446 out: 447 return rc; 448 } 449 450 static int x25_getsockopt(struct socket *sock, int level, int optname, 451 char __user *optval, int __user *optlen) 452 { 453 struct sock *sk = sock->sk; 454 int val, len, rc = -ENOPROTOOPT; 455 456 if (level != SOL_X25 || optname != X25_QBITINCL) 457 goto out; 458 459 rc = -EFAULT; 460 if (get_user(len, optlen)) 461 goto out; 462 463 rc = -EINVAL; 464 if (len < 0) 465 goto out; 466 467 len = min_t(unsigned int, len, sizeof(int)); 468 469 rc = -EFAULT; 470 if (put_user(len, optlen)) 471 goto out; 472 473 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 474 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 475 out: 476 return rc; 477 } 478 479 static int x25_listen(struct socket *sock, int backlog) 480 { 481 struct sock *sk = sock->sk; 482 int rc = -EOPNOTSUPP; 483 484 lock_sock(sk); 485 if (sock->state != SS_UNCONNECTED) { 486 rc = -EINVAL; 487 release_sock(sk); 488 return rc; 489 } 490 491 if (sk->sk_state != TCP_LISTEN) { 492 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 493 sk->sk_max_ack_backlog = backlog; 494 sk->sk_state = TCP_LISTEN; 495 rc = 0; 496 } 497 release_sock(sk); 498 499 return rc; 500 } 501 502 static struct proto x25_proto = { 503 .name = "X25", 504 .owner = THIS_MODULE, 505 .obj_size = sizeof(struct x25_sock), 506 }; 507 508 static struct sock *x25_alloc_socket(struct net *net, int kern) 509 { 510 struct x25_sock *x25; 511 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 512 513 if (!sk) 514 goto out; 515 516 sock_init_data(NULL, sk); 517 518 x25 = x25_sk(sk); 519 skb_queue_head_init(&x25->ack_queue); 520 skb_queue_head_init(&x25->fragment_queue); 521 skb_queue_head_init(&x25->interrupt_in_queue); 522 skb_queue_head_init(&x25->interrupt_out_queue); 523 out: 524 return sk; 525 } 526 527 static int x25_create(struct net *net, struct socket *sock, int protocol, 528 int kern) 529 { 530 struct sock *sk; 531 struct x25_sock *x25; 532 int rc = -EAFNOSUPPORT; 533 534 if (!net_eq(net, &init_net)) 535 goto out; 536 537 rc = -ESOCKTNOSUPPORT; 538 if (sock->type != SOCK_SEQPACKET) 539 goto out; 540 541 rc = -EINVAL; 542 if (protocol) 543 goto out; 544 545 rc = -ENOMEM; 546 if ((sk = x25_alloc_socket(net, kern)) == NULL) 547 goto out; 548 549 x25 = x25_sk(sk); 550 551 sock_init_data(sock, sk); 552 553 x25_init_timers(sk); 554 555 sock->ops = &x25_proto_ops; 556 sk->sk_protocol = protocol; 557 sk->sk_backlog_rcv = x25_backlog_rcv; 558 559 x25->t21 = sysctl_x25_call_request_timeout; 560 x25->t22 = sysctl_x25_reset_request_timeout; 561 x25->t23 = sysctl_x25_clear_request_timeout; 562 x25->t2 = sysctl_x25_ack_holdback_timeout; 563 x25->state = X25_STATE_0; 564 x25->cudmatchlength = 0; 565 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 566 /* on call accept */ 567 568 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 569 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 570 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 571 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 572 x25->facilities.throughput = 0; /* by default don't negotiate 573 throughput */ 574 x25->facilities.reverse = X25_DEFAULT_REVERSE; 575 x25->dte_facilities.calling_len = 0; 576 x25->dte_facilities.called_len = 0; 577 memset(x25->dte_facilities.called_ae, '\0', 578 sizeof(x25->dte_facilities.called_ae)); 579 memset(x25->dte_facilities.calling_ae, '\0', 580 sizeof(x25->dte_facilities.calling_ae)); 581 582 rc = 0; 583 out: 584 return rc; 585 } 586 587 static struct sock *x25_make_new(struct sock *osk) 588 { 589 struct sock *sk = NULL; 590 struct x25_sock *x25, *ox25; 591 592 if (osk->sk_type != SOCK_SEQPACKET) 593 goto out; 594 595 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 596 goto out; 597 598 x25 = x25_sk(sk); 599 600 sk->sk_type = osk->sk_type; 601 sk->sk_priority = READ_ONCE(osk->sk_priority); 602 sk->sk_protocol = osk->sk_protocol; 603 sk->sk_rcvbuf = osk->sk_rcvbuf; 604 sk->sk_sndbuf = osk->sk_sndbuf; 605 sk->sk_state = TCP_ESTABLISHED; 606 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 607 sock_copy_flags(sk, osk); 608 609 ox25 = x25_sk(osk); 610 x25->t21 = ox25->t21; 611 x25->t22 = ox25->t22; 612 x25->t23 = ox25->t23; 613 x25->t2 = ox25->t2; 614 x25->flags = ox25->flags; 615 x25->facilities = ox25->facilities; 616 x25->dte_facilities = ox25->dte_facilities; 617 x25->cudmatchlength = ox25->cudmatchlength; 618 619 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 620 x25_init_timers(sk); 621 out: 622 return sk; 623 } 624 625 static int x25_release(struct socket *sock) 626 { 627 struct sock *sk = sock->sk; 628 struct x25_sock *x25; 629 630 if (!sk) 631 return 0; 632 633 x25 = x25_sk(sk); 634 635 sock_hold(sk); 636 lock_sock(sk); 637 switch (x25->state) { 638 639 case X25_STATE_0: 640 case X25_STATE_2: 641 x25_disconnect(sk, 0, 0, 0); 642 __x25_destroy_socket(sk); 643 goto out; 644 645 case X25_STATE_1: 646 case X25_STATE_3: 647 case X25_STATE_4: 648 x25_clear_queues(sk); 649 x25_write_internal(sk, X25_CLEAR_REQUEST); 650 x25_start_t23timer(sk); 651 x25->state = X25_STATE_2; 652 sk->sk_state = TCP_CLOSE; 653 sk->sk_shutdown |= SEND_SHUTDOWN; 654 sk->sk_state_change(sk); 655 sock_set_flag(sk, SOCK_DEAD); 656 sock_set_flag(sk, SOCK_DESTROY); 657 break; 658 659 case X25_STATE_5: 660 x25_write_internal(sk, X25_CLEAR_REQUEST); 661 x25_disconnect(sk, 0, 0, 0); 662 __x25_destroy_socket(sk); 663 goto out; 664 } 665 666 sock_orphan(sk); 667 out: 668 release_sock(sk); 669 sock_put(sk); 670 return 0; 671 } 672 673 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 674 { 675 struct sock *sk = sock->sk; 676 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 677 int len, i, rc = 0; 678 679 if (addr_len != sizeof(struct sockaddr_x25) || 680 addr->sx25_family != AF_X25 || 681 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) { 682 rc = -EINVAL; 683 goto out; 684 } 685 686 /* check for the null_x25_address */ 687 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { 688 689 len = strlen(addr->sx25_addr.x25_addr); 690 for (i = 0; i < len; i++) { 691 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 692 rc = -EINVAL; 693 goto out; 694 } 695 } 696 } 697 698 lock_sock(sk); 699 if (sock_flag(sk, SOCK_ZAPPED)) { 700 x25_sk(sk)->source_addr = addr->sx25_addr; 701 x25_insert_socket(sk); 702 sock_reset_flag(sk, SOCK_ZAPPED); 703 } else { 704 rc = -EINVAL; 705 } 706 release_sock(sk); 707 net_dbg_ratelimited("x25_bind: socket is bound\n"); 708 out: 709 return rc; 710 } 711 712 static int x25_wait_for_connection_establishment(struct sock *sk) 713 { 714 DECLARE_WAITQUEUE(wait, current); 715 int rc; 716 717 add_wait_queue_exclusive(sk_sleep(sk), &wait); 718 for (;;) { 719 __set_current_state(TASK_INTERRUPTIBLE); 720 rc = -ERESTARTSYS; 721 if (signal_pending(current)) 722 break; 723 rc = sock_error(sk); 724 if (rc) { 725 sk->sk_socket->state = SS_UNCONNECTED; 726 break; 727 } 728 rc = -ENOTCONN; 729 if (sk->sk_state == TCP_CLOSE) { 730 sk->sk_socket->state = SS_UNCONNECTED; 731 break; 732 } 733 rc = 0; 734 if (sk->sk_state != TCP_ESTABLISHED) { 735 release_sock(sk); 736 schedule(); 737 lock_sock(sk); 738 } else 739 break; 740 } 741 __set_current_state(TASK_RUNNING); 742 remove_wait_queue(sk_sleep(sk), &wait); 743 return rc; 744 } 745 746 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 747 int addr_len, int flags) 748 { 749 struct sock *sk = sock->sk; 750 struct x25_sock *x25 = x25_sk(sk); 751 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 752 struct x25_route *rt; 753 int rc = 0; 754 755 lock_sock(sk); 756 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 757 sock->state = SS_CONNECTED; 758 goto out; /* Connect completed during a ERESTARTSYS event */ 759 } 760 761 rc = -ECONNREFUSED; 762 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 763 sock->state = SS_UNCONNECTED; 764 goto out; 765 } 766 767 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 768 if (sk->sk_state == TCP_ESTABLISHED) 769 goto out; 770 771 rc = -EALREADY; /* Do nothing if call is already in progress */ 772 if (sk->sk_state == TCP_SYN_SENT) 773 goto out; 774 775 sk->sk_state = TCP_CLOSE; 776 sock->state = SS_UNCONNECTED; 777 778 rc = -EINVAL; 779 if (addr_len != sizeof(struct sockaddr_x25) || 780 addr->sx25_family != AF_X25 || 781 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) 782 goto out; 783 784 rc = -ENETUNREACH; 785 rt = x25_get_route(&addr->sx25_addr); 786 if (!rt) 787 goto out; 788 789 x25->neighbour = x25_get_neigh(rt->dev); 790 if (!x25->neighbour) 791 goto out_put_route; 792 793 x25_limit_facilities(&x25->facilities, x25->neighbour); 794 795 x25->lci = x25_new_lci(x25->neighbour); 796 if (!x25->lci) 797 goto out_put_neigh; 798 799 rc = -EINVAL; 800 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 801 goto out_put_neigh; 802 803 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 804 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 805 806 x25->dest_addr = addr->sx25_addr; 807 808 /* Move to connecting socket, start sending Connect Requests */ 809 sock->state = SS_CONNECTING; 810 sk->sk_state = TCP_SYN_SENT; 811 812 x25->state = X25_STATE_1; 813 814 x25_write_internal(sk, X25_CALL_REQUEST); 815 816 x25_start_heartbeat(sk); 817 x25_start_t21timer(sk); 818 819 /* Now the loop */ 820 rc = -EINPROGRESS; 821 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 822 goto out; 823 824 rc = x25_wait_for_connection_establishment(sk); 825 if (rc) 826 goto out_put_neigh; 827 828 sock->state = SS_CONNECTED; 829 rc = 0; 830 out_put_neigh: 831 if (rc && x25->neighbour) { 832 read_lock_bh(&x25_list_lock); 833 x25_neigh_put(x25->neighbour); 834 x25->neighbour = NULL; 835 read_unlock_bh(&x25_list_lock); 836 x25->state = X25_STATE_0; 837 } 838 out_put_route: 839 x25_route_put(rt); 840 out: 841 release_sock(sk); 842 return rc; 843 } 844 845 static int x25_wait_for_data(struct sock *sk, long timeout) 846 { 847 DECLARE_WAITQUEUE(wait, current); 848 int rc = 0; 849 850 add_wait_queue_exclusive(sk_sleep(sk), &wait); 851 for (;;) { 852 __set_current_state(TASK_INTERRUPTIBLE); 853 if (sk->sk_shutdown & RCV_SHUTDOWN) 854 break; 855 rc = -ERESTARTSYS; 856 if (signal_pending(current)) 857 break; 858 rc = -EAGAIN; 859 if (!timeout) 860 break; 861 rc = 0; 862 if (skb_queue_empty(&sk->sk_receive_queue)) { 863 release_sock(sk); 864 timeout = schedule_timeout(timeout); 865 lock_sock(sk); 866 } else 867 break; 868 } 869 __set_current_state(TASK_RUNNING); 870 remove_wait_queue(sk_sleep(sk), &wait); 871 return rc; 872 } 873 874 static int x25_accept(struct socket *sock, struct socket *newsock, 875 struct proto_accept_arg *arg) 876 { 877 struct sock *sk = sock->sk; 878 struct sock *newsk; 879 struct sk_buff *skb; 880 int rc = -EINVAL; 881 882 if (!sk) 883 goto out; 884 885 rc = -EOPNOTSUPP; 886 if (sk->sk_type != SOCK_SEQPACKET) 887 goto out; 888 889 lock_sock(sk); 890 rc = -EINVAL; 891 if (sk->sk_state != TCP_LISTEN) 892 goto out2; 893 894 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 895 if (rc) 896 goto out2; 897 skb = skb_dequeue(&sk->sk_receive_queue); 898 rc = -EINVAL; 899 if (!skb->sk) 900 goto out2; 901 newsk = skb->sk; 902 sock_graft(newsk, newsock); 903 904 /* Now attach up the new socket */ 905 skb->sk = NULL; 906 kfree_skb(skb); 907 sk_acceptq_removed(sk); 908 newsock->state = SS_CONNECTED; 909 rc = 0; 910 out2: 911 release_sock(sk); 912 out: 913 return rc; 914 } 915 916 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 917 int peer) 918 { 919 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 920 struct sock *sk = sock->sk; 921 struct x25_sock *x25 = x25_sk(sk); 922 int rc = 0; 923 924 if (peer) { 925 if (sk->sk_state != TCP_ESTABLISHED) { 926 rc = -ENOTCONN; 927 goto out; 928 } 929 sx25->sx25_addr = x25->dest_addr; 930 } else 931 sx25->sx25_addr = x25->source_addr; 932 933 sx25->sx25_family = AF_X25; 934 rc = sizeof(*sx25); 935 936 out: 937 return rc; 938 } 939 940 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 941 unsigned int lci) 942 { 943 struct sock *sk; 944 struct sock *make; 945 struct x25_sock *makex25; 946 struct x25_address source_addr, dest_addr; 947 struct x25_facilities facilities; 948 struct x25_dte_facilities dte_facilities; 949 int len, addr_len, rc; 950 951 /* 952 * Remove the LCI and frame type. 953 */ 954 skb_pull(skb, X25_STD_MIN_LEN); 955 956 /* 957 * Extract the X.25 addresses and convert them to ASCII strings, 958 * and remove them. 959 * 960 * Address block is mandatory in call request packets 961 */ 962 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 963 if (addr_len <= 0) 964 goto out_clear_request; 965 skb_pull(skb, addr_len); 966 967 /* 968 * Get the length of the facilities, skip past them for the moment 969 * get the call user data because this is needed to determine 970 * the correct listener 971 * 972 * Facilities length is mandatory in call request packets 973 */ 974 if (!pskb_may_pull(skb, 1)) 975 goto out_clear_request; 976 len = skb->data[0] + 1; 977 if (!pskb_may_pull(skb, len)) 978 goto out_clear_request; 979 skb_pull(skb,len); 980 981 /* 982 * Ensure that the amount of call user data is valid. 983 */ 984 if (skb->len > X25_MAX_CUD_LEN) 985 goto out_clear_request; 986 987 /* 988 * Get all the call user data so it can be used in 989 * x25_find_listener and skb_copy_from_linear_data up ahead. 990 */ 991 if (!pskb_may_pull(skb, skb->len)) 992 goto out_clear_request; 993 994 /* 995 * Find a listener for the particular address/cud pair. 996 */ 997 sk = x25_find_listener(&source_addr,skb); 998 skb_push(skb,len); 999 1000 if (sk != NULL && sk_acceptq_is_full(sk)) { 1001 goto out_sock_put; 1002 } 1003 1004 /* 1005 * We dont have any listeners for this incoming call. 1006 * Try forwarding it. 1007 */ 1008 if (sk == NULL) { 1009 skb_push(skb, addr_len + X25_STD_MIN_LEN); 1010 if (sysctl_x25_forward && 1011 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 1012 { 1013 /* Call was forwarded, dont process it any more */ 1014 kfree_skb(skb); 1015 rc = 1; 1016 goto out; 1017 } else { 1018 /* No listeners, can't forward, clear the call */ 1019 goto out_clear_request; 1020 } 1021 } 1022 1023 /* 1024 * Try to reach a compromise on the requested facilities. 1025 */ 1026 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1027 if (len == -1) 1028 goto out_sock_put; 1029 1030 /* 1031 * current neighbour/link might impose additional limits 1032 * on certain facilities 1033 */ 1034 1035 x25_limit_facilities(&facilities, nb); 1036 1037 /* 1038 * Try to create a new socket. 1039 */ 1040 make = x25_make_new(sk); 1041 if (!make) 1042 goto out_sock_put; 1043 1044 /* 1045 * Remove the facilities 1046 */ 1047 skb_pull(skb, len); 1048 1049 skb->sk = make; 1050 make->sk_state = TCP_ESTABLISHED; 1051 1052 makex25 = x25_sk(make); 1053 makex25->lci = lci; 1054 makex25->dest_addr = dest_addr; 1055 makex25->source_addr = source_addr; 1056 x25_neigh_hold(nb); 1057 makex25->neighbour = nb; 1058 makex25->facilities = facilities; 1059 makex25->dte_facilities= dte_facilities; 1060 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1061 /* ensure no reverse facil on accept */ 1062 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1063 /* ensure no calling address extension on accept */ 1064 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1065 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1066 1067 /* Normally all calls are accepted immediately */ 1068 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1069 x25_write_internal(make, X25_CALL_ACCEPTED); 1070 makex25->state = X25_STATE_3; 1071 } else { 1072 makex25->state = X25_STATE_5; 1073 } 1074 1075 /* 1076 * Incoming Call User Data. 1077 */ 1078 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1079 makex25->calluserdata.cudlength = skb->len; 1080 1081 sk_acceptq_added(sk); 1082 1083 x25_insert_socket(make); 1084 1085 skb_queue_head(&sk->sk_receive_queue, skb); 1086 1087 x25_start_heartbeat(make); 1088 1089 if (!sock_flag(sk, SOCK_DEAD)) 1090 sk->sk_data_ready(sk); 1091 rc = 1; 1092 sock_put(sk); 1093 out: 1094 return rc; 1095 out_sock_put: 1096 sock_put(sk); 1097 out_clear_request: 1098 rc = 0; 1099 x25_transmit_clear_request(nb, lci, 0x01); 1100 goto out; 1101 } 1102 1103 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1104 { 1105 struct sock *sk = sock->sk; 1106 struct x25_sock *x25 = x25_sk(sk); 1107 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1108 struct sockaddr_x25 sx25; 1109 struct sk_buff *skb; 1110 unsigned char *asmptr; 1111 int noblock = msg->msg_flags & MSG_DONTWAIT; 1112 size_t size; 1113 int qbit = 0, rc = -EINVAL; 1114 1115 lock_sock(sk); 1116 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1117 goto out; 1118 1119 /* we currently don't support segmented records at the user interface */ 1120 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1121 goto out; 1122 1123 rc = -EADDRNOTAVAIL; 1124 if (sock_flag(sk, SOCK_ZAPPED)) 1125 goto out; 1126 1127 rc = -EPIPE; 1128 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1129 send_sig(SIGPIPE, current, 0); 1130 goto out; 1131 } 1132 1133 rc = -ENETUNREACH; 1134 if (!x25->neighbour) 1135 goto out; 1136 1137 if (usx25) { 1138 rc = -EINVAL; 1139 if (msg->msg_namelen < sizeof(sx25)) 1140 goto out; 1141 memcpy(&sx25, usx25, sizeof(sx25)); 1142 rc = -EISCONN; 1143 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1144 goto out; 1145 rc = -EINVAL; 1146 if (sx25.sx25_family != AF_X25) 1147 goto out; 1148 } else { 1149 /* 1150 * FIXME 1003.1g - if the socket is like this because 1151 * it has become closed (not started closed) we ought 1152 * to SIGPIPE, EPIPE; 1153 */ 1154 rc = -ENOTCONN; 1155 if (sk->sk_state != TCP_ESTABLISHED) 1156 goto out; 1157 1158 sx25.sx25_family = AF_X25; 1159 sx25.sx25_addr = x25->dest_addr; 1160 } 1161 1162 /* Sanity check the packet size */ 1163 if (len > 65535) { 1164 rc = -EMSGSIZE; 1165 goto out; 1166 } 1167 1168 net_dbg_ratelimited("x25_sendmsg: sendto: Addresses built.\n"); 1169 1170 /* Build a packet */ 1171 net_dbg_ratelimited("x25_sendmsg: sendto: building packet.\n"); 1172 1173 if ((msg->msg_flags & MSG_OOB) && len > 32) 1174 len = 32; 1175 1176 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1177 1178 release_sock(sk); 1179 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1180 lock_sock(sk); 1181 if (!skb) 1182 goto out; 1183 X25_SKB_CB(skb)->flags = msg->msg_flags; 1184 1185 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1186 1187 /* 1188 * Put the data on the end 1189 */ 1190 net_dbg_ratelimited("x25_sendmsg: Copying user data\n"); 1191 1192 skb_reset_transport_header(skb); 1193 skb_put(skb, len); 1194 1195 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1196 if (rc) 1197 goto out_kfree_skb; 1198 1199 /* 1200 * If the Q BIT Include socket option is in force, the first 1201 * byte of the user data is the logical value of the Q Bit. 1202 */ 1203 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1204 if (!pskb_may_pull(skb, 1)) 1205 goto out_kfree_skb; 1206 1207 qbit = skb->data[0]; 1208 skb_pull(skb, 1); 1209 } 1210 1211 /* 1212 * Push down the X.25 header 1213 */ 1214 net_dbg_ratelimited("x25_sendmsg: Building X.25 Header.\n"); 1215 1216 if (msg->msg_flags & MSG_OOB) { 1217 if (x25->neighbour->extended) { 1218 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1219 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1220 *asmptr++ = (x25->lci >> 0) & 0xFF; 1221 *asmptr++ = X25_INTERRUPT; 1222 } else { 1223 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1224 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1225 *asmptr++ = (x25->lci >> 0) & 0xFF; 1226 *asmptr++ = X25_INTERRUPT; 1227 } 1228 } else { 1229 if (x25->neighbour->extended) { 1230 /* Build an Extended X.25 header */ 1231 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1232 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1233 *asmptr++ = (x25->lci >> 0) & 0xFF; 1234 *asmptr++ = X25_DATA; 1235 *asmptr++ = X25_DATA; 1236 } else { 1237 /* Build an Standard X.25 header */ 1238 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1239 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1240 *asmptr++ = (x25->lci >> 0) & 0xFF; 1241 *asmptr++ = X25_DATA; 1242 } 1243 1244 if (qbit) 1245 skb->data[0] |= X25_Q_BIT; 1246 } 1247 1248 net_dbg_ratelimited("x25_sendmsg: Built header.\n"); 1249 net_dbg_ratelimited("x25_sendmsg: Transmitting buffer\n"); 1250 1251 rc = -ENOTCONN; 1252 if (sk->sk_state != TCP_ESTABLISHED) 1253 goto out_kfree_skb; 1254 1255 if (msg->msg_flags & MSG_OOB) 1256 skb_queue_tail(&x25->interrupt_out_queue, skb); 1257 else { 1258 rc = x25_output(sk, skb); 1259 len = rc; 1260 if (rc < 0) 1261 kfree_skb(skb); 1262 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1263 len++; 1264 } 1265 1266 x25_kick(sk); 1267 rc = len; 1268 out: 1269 release_sock(sk); 1270 return rc; 1271 out_kfree_skb: 1272 kfree_skb(skb); 1273 goto out; 1274 } 1275 1276 1277 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1278 int flags) 1279 { 1280 struct sock *sk = sock->sk; 1281 struct x25_sock *x25 = x25_sk(sk); 1282 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1283 size_t copied; 1284 int qbit, header_len; 1285 struct sk_buff *skb; 1286 unsigned char *asmptr; 1287 int rc = -ENOTCONN; 1288 1289 lock_sock(sk); 1290 1291 if (x25->neighbour == NULL) 1292 goto out; 1293 1294 header_len = x25->neighbour->extended ? 1295 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1296 1297 /* 1298 * This works for seqpacket too. The receiver has ordered the queue for 1299 * us! We do one quick check first though 1300 */ 1301 if (sk->sk_state != TCP_ESTABLISHED) 1302 goto out; 1303 1304 if (flags & MSG_OOB) { 1305 rc = -EINVAL; 1306 if (sock_flag(sk, SOCK_URGINLINE) || 1307 !skb_peek(&x25->interrupt_in_queue)) 1308 goto out; 1309 1310 skb = skb_dequeue(&x25->interrupt_in_queue); 1311 1312 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1313 goto out_free_dgram; 1314 1315 skb_pull(skb, X25_STD_MIN_LEN); 1316 1317 /* 1318 * No Q bit information on Interrupt data. 1319 */ 1320 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1321 asmptr = skb_push(skb, 1); 1322 *asmptr = 0x00; 1323 } 1324 1325 msg->msg_flags |= MSG_OOB; 1326 } else { 1327 /* Now we can treat all alike */ 1328 release_sock(sk); 1329 skb = skb_recv_datagram(sk, flags, &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 }; 1761 1762 static struct packet_type x25_packet_type __read_mostly = { 1763 .type = cpu_to_be16(ETH_P_X25), 1764 .func = x25_lapb_receive_frame, 1765 }; 1766 1767 static struct notifier_block x25_dev_notifier = { 1768 .notifier_call = x25_device_event, 1769 }; 1770 1771 void x25_kill_by_neigh(struct x25_neigh *nb) 1772 { 1773 struct sock *s; 1774 1775 write_lock_bh(&x25_list_lock); 1776 1777 sk_for_each(s, &x25_list) { 1778 if (x25_sk(s)->neighbour == nb) { 1779 write_unlock_bh(&x25_list_lock); 1780 lock_sock(s); 1781 x25_disconnect(s, ENETUNREACH, 0, 0); 1782 release_sock(s); 1783 write_lock_bh(&x25_list_lock); 1784 } 1785 } 1786 write_unlock_bh(&x25_list_lock); 1787 1788 /* Remove any related forwards */ 1789 x25_clear_forward_by_dev(nb->dev); 1790 } 1791 1792 static int __init x25_init(void) 1793 { 1794 int rc; 1795 1796 rc = proto_register(&x25_proto, 0); 1797 if (rc) 1798 goto out; 1799 1800 rc = sock_register(&x25_family_ops); 1801 if (rc) 1802 goto out_proto; 1803 1804 dev_add_pack(&x25_packet_type); 1805 1806 rc = register_netdevice_notifier(&x25_dev_notifier); 1807 if (rc) 1808 goto out_sock; 1809 1810 rc = x25_register_sysctl(); 1811 if (rc) 1812 goto out_dev; 1813 1814 rc = x25_proc_init(); 1815 if (rc) 1816 goto out_sysctl; 1817 1818 pr_info("Linux Version 0.2\n"); 1819 1820 out: 1821 return rc; 1822 out_sysctl: 1823 x25_unregister_sysctl(); 1824 out_dev: 1825 unregister_netdevice_notifier(&x25_dev_notifier); 1826 out_sock: 1827 dev_remove_pack(&x25_packet_type); 1828 sock_unregister(AF_X25); 1829 out_proto: 1830 proto_unregister(&x25_proto); 1831 goto out; 1832 } 1833 module_init(x25_init); 1834 1835 static void __exit x25_exit(void) 1836 { 1837 x25_proc_exit(); 1838 x25_link_free(); 1839 x25_route_free(); 1840 1841 x25_unregister_sysctl(); 1842 1843 unregister_netdevice_notifier(&x25_dev_notifier); 1844 1845 dev_remove_pack(&x25_packet_type); 1846 1847 sock_unregister(AF_X25); 1848 proto_unregister(&x25_proto); 1849 } 1850 module_exit(x25_exit); 1851 1852 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1853 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1854 MODULE_LICENSE("GPL"); 1855 MODULE_ALIAS_NETPROTO(PF_X25); 1856