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