1 /* 2 * X.25 Packet Layer release 002 3 * 4 * This is ALPHA test software. This code may break your machine, 5 * randomly fail to work with new releases, misbehave and/or generally 6 * screw up. It might even work. 7 * 8 * This code REQUIRES 2.1.15 or higher 9 * 10 * This module: 11 * This module is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 * 16 * History 17 * X.25 001 Jonathan Naylor Started coding. 18 * X.25 002 Jonathan Naylor Centralised disconnect handling. 19 * New timer architecture. 20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. 21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of 22 * facilities negotiation and increased 23 * the throughput upper limit. 24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups 25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept(). 26 * Fixed x25_output() related skb leakage. 27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. 28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. 29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN 30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to 31 * x25_proc.c, using seq_file 32 * 2005-04-02 Shaun Pereira Selective sub address matching 33 * with call user data 34 * 2005-04-15 Shaun Pereira Fast select with no restriction on 35 * response 36 */ 37 38 #define pr_fmt(fmt) "X25: " fmt 39 40 #include <linux/module.h> 41 #include <linux/capability.h> 42 #include <linux/errno.h> 43 #include <linux/kernel.h> 44 #include <linux/sched/signal.h> 45 #include <linux/timer.h> 46 #include <linux/string.h> 47 #include <linux/net.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_arp.h> 50 #include <linux/skbuff.h> 51 #include <linux/slab.h> 52 #include <net/sock.h> 53 #include <net/tcp_states.h> 54 #include <linux/uaccess.h> 55 #include <linux/fcntl.h> 56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 57 #include <linux/notifier.h> 58 #include <linux/init.h> 59 #include <linux/compat.h> 60 #include <linux/ctype.h> 61 62 #include <net/x25.h> 63 #include <net/compat.h> 64 65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 66 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 67 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 68 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 69 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 70 int sysctl_x25_forward = 0; 71 72 HLIST_HEAD(x25_list); 73 DEFINE_RWLOCK(x25_list_lock); 74 75 static const struct proto_ops x25_proto_ops; 76 77 static const struct x25_address null_x25_address = {" "}; 78 79 #ifdef CONFIG_COMPAT 80 struct compat_x25_subscrip_struct { 81 char device[200-sizeof(compat_ulong_t)]; 82 compat_ulong_t global_facil_mask; 83 compat_uint_t extended; 84 }; 85 #endif 86 87 88 int x25_parse_address_block(struct sk_buff *skb, 89 struct x25_address *called_addr, 90 struct x25_address *calling_addr) 91 { 92 unsigned char len; 93 int needed; 94 int rc; 95 96 if (!pskb_may_pull(skb, 1)) { 97 /* packet has no address block */ 98 rc = 0; 99 goto empty; 100 } 101 102 len = *skb->data; 103 needed = 1 + (len >> 4) + (len & 0x0f); 104 105 if (!pskb_may_pull(skb, needed)) { 106 /* packet is too short to hold the addresses it claims 107 to hold */ 108 rc = -1; 109 goto empty; 110 } 111 112 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 113 114 empty: 115 *called_addr->x25_addr = 0; 116 *calling_addr->x25_addr = 0; 117 118 return rc; 119 } 120 121 122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 123 struct x25_address *calling_addr) 124 { 125 unsigned int called_len, calling_len; 126 char *called, *calling; 127 unsigned int i; 128 129 called_len = (*p >> 0) & 0x0F; 130 calling_len = (*p >> 4) & 0x0F; 131 132 called = called_addr->x25_addr; 133 calling = calling_addr->x25_addr; 134 p++; 135 136 for (i = 0; i < (called_len + calling_len); i++) { 137 if (i < called_len) { 138 if (i % 2 != 0) { 139 *called++ = ((*p >> 0) & 0x0F) + '0'; 140 p++; 141 } else { 142 *called++ = ((*p >> 4) & 0x0F) + '0'; 143 } 144 } else { 145 if (i % 2 != 0) { 146 *calling++ = ((*p >> 0) & 0x0F) + '0'; 147 p++; 148 } else { 149 *calling++ = ((*p >> 4) & 0x0F) + '0'; 150 } 151 } 152 } 153 154 *called = *calling = '\0'; 155 156 return 1 + (called_len + calling_len + 1) / 2; 157 } 158 159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 160 struct x25_address *calling_addr) 161 { 162 unsigned int called_len, calling_len; 163 char *called, *calling; 164 int i; 165 166 called = called_addr->x25_addr; 167 calling = calling_addr->x25_addr; 168 169 called_len = strlen(called); 170 calling_len = strlen(calling); 171 172 *p++ = (calling_len << 4) | (called_len << 0); 173 174 for (i = 0; i < (called_len + calling_len); i++) { 175 if (i < called_len) { 176 if (i % 2 != 0) { 177 *p |= (*called++ - '0') << 0; 178 p++; 179 } else { 180 *p = 0x00; 181 *p |= (*called++ - '0') << 4; 182 } 183 } else { 184 if (i % 2 != 0) { 185 *p |= (*calling++ - '0') << 0; 186 p++; 187 } else { 188 *p = 0x00; 189 *p |= (*calling++ - '0') << 4; 190 } 191 } 192 } 193 194 return 1 + (called_len + calling_len + 1) / 2; 195 } 196 197 /* 198 * Socket removal during an interrupt is now safe. 199 */ 200 static void x25_remove_socket(struct sock *sk) 201 { 202 write_lock_bh(&x25_list_lock); 203 sk_del_node_init(sk); 204 write_unlock_bh(&x25_list_lock); 205 } 206 207 /* 208 * Kill all bound sockets on a dropped device. 209 */ 210 static void x25_kill_by_device(struct net_device *dev) 211 { 212 struct sock *s; 213 214 write_lock_bh(&x25_list_lock); 215 216 sk_for_each(s, &x25_list) 217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 218 x25_disconnect(s, ENETUNREACH, 0, 0); 219 220 write_unlock_bh(&x25_list_lock); 221 } 222 223 /* 224 * Handle device status changes. 225 */ 226 static int x25_device_event(struct notifier_block *this, unsigned long event, 227 void *ptr) 228 { 229 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 230 struct x25_neigh *nb; 231 232 if (!net_eq(dev_net(dev), &init_net)) 233 return NOTIFY_DONE; 234 235 if (dev->type == ARPHRD_X25 236 #if IS_ENABLED(CONFIG_LLC) 237 || dev->type == ARPHRD_ETHER 238 #endif 239 ) { 240 switch (event) { 241 case NETDEV_UP: 242 x25_link_device_up(dev); 243 break; 244 case NETDEV_GOING_DOWN: 245 nb = x25_get_neigh(dev); 246 if (nb) { 247 x25_terminate_link(nb); 248 x25_neigh_put(nb); 249 } 250 break; 251 case NETDEV_DOWN: 252 x25_kill_by_device(dev); 253 x25_route_device_down(dev); 254 x25_link_device_down(dev); 255 break; 256 } 257 } 258 259 return NOTIFY_DONE; 260 } 261 262 /* 263 * Add a socket to the bound sockets list. 264 */ 265 static void x25_insert_socket(struct sock *sk) 266 { 267 write_lock_bh(&x25_list_lock); 268 sk_add_node(sk, &x25_list); 269 write_unlock_bh(&x25_list_lock); 270 } 271 272 /* 273 * Find a socket that wants to accept the Call Request we just 274 * received. Check the full list for an address/cud match. 275 * If no cuds match return the next_best thing, an address match. 276 * Note: if a listening socket has cud set it must only get calls 277 * with matching cud. 278 */ 279 static struct sock *x25_find_listener(struct x25_address *addr, 280 struct sk_buff *skb) 281 { 282 struct sock *s; 283 struct sock *next_best; 284 285 read_lock_bh(&x25_list_lock); 286 next_best = NULL; 287 288 sk_for_each(s, &x25_list) 289 if ((!strcmp(addr->x25_addr, 290 x25_sk(s)->source_addr.x25_addr) || 291 !strcmp(addr->x25_addr, 292 null_x25_address.x25_addr)) && 293 s->sk_state == TCP_LISTEN) { 294 /* 295 * Found a listening socket, now check the incoming 296 * call user data vs this sockets call user data 297 */ 298 if (x25_sk(s)->cudmatchlength > 0 && 299 skb->len >= x25_sk(s)->cudmatchlength) { 300 if((memcmp(x25_sk(s)->calluserdata.cuddata, 301 skb->data, 302 x25_sk(s)->cudmatchlength)) == 0) { 303 sock_hold(s); 304 goto found; 305 } 306 } else 307 next_best = s; 308 } 309 if (next_best) { 310 s = next_best; 311 sock_hold(s); 312 goto found; 313 } 314 s = NULL; 315 found: 316 read_unlock_bh(&x25_list_lock); 317 return s; 318 } 319 320 /* 321 * Find a connected X.25 socket given my LCI and neighbour. 322 */ 323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 324 { 325 struct sock *s; 326 327 sk_for_each(s, &x25_list) 328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 329 sock_hold(s); 330 goto found; 331 } 332 s = NULL; 333 found: 334 return s; 335 } 336 337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 338 { 339 struct sock *s; 340 341 read_lock_bh(&x25_list_lock); 342 s = __x25_find_socket(lci, nb); 343 read_unlock_bh(&x25_list_lock); 344 return s; 345 } 346 347 /* 348 * Find a unique LCI for a given device. 349 */ 350 static unsigned int x25_new_lci(struct x25_neigh *nb) 351 { 352 unsigned int lci = 1; 353 struct sock *sk; 354 355 read_lock_bh(&x25_list_lock); 356 357 while ((sk = __x25_find_socket(lci, nb)) != NULL) { 358 sock_put(sk); 359 if (++lci == 4096) { 360 lci = 0; 361 break; 362 } 363 } 364 365 read_unlock_bh(&x25_list_lock); 366 return lci; 367 } 368 369 /* 370 * Deferred destroy. 371 */ 372 static void __x25_destroy_socket(struct sock *); 373 374 /* 375 * handler for deferred kills. 376 */ 377 static void x25_destroy_timer(struct timer_list *t) 378 { 379 struct sock *sk = from_timer(sk, t, sk_timer); 380 381 x25_destroy_socket_from_timer(sk); 382 } 383 384 /* 385 * This is called from user mode and the timers. Thus it protects itself 386 * against interrupt users but doesn't worry about being called during 387 * work. Once it is removed from the queue no interrupt or bottom half 388 * will touch it and we are (fairly 8-) ) safe. 389 * Not static as it's used by the timer 390 */ 391 static void __x25_destroy_socket(struct sock *sk) 392 { 393 struct sk_buff *skb; 394 395 x25_stop_heartbeat(sk); 396 x25_stop_timer(sk); 397 398 x25_remove_socket(sk); 399 x25_clear_queues(sk); /* Flush the queues */ 400 401 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 402 if (skb->sk != sk) { /* A pending connection */ 403 /* 404 * Queue the unaccepted socket for death 405 */ 406 skb->sk->sk_state = TCP_LISTEN; 407 sock_set_flag(skb->sk, SOCK_DEAD); 408 x25_start_heartbeat(skb->sk); 409 x25_sk(skb->sk)->state = X25_STATE_0; 410 } 411 412 kfree_skb(skb); 413 } 414 415 if (sk_has_allocations(sk)) { 416 /* Defer: outstanding buffers */ 417 sk->sk_timer.expires = jiffies + 10 * HZ; 418 sk->sk_timer.function = x25_destroy_timer; 419 add_timer(&sk->sk_timer); 420 } else { 421 /* drop last reference so sock_put will free */ 422 __sock_put(sk); 423 } 424 } 425 426 void x25_destroy_socket_from_timer(struct sock *sk) 427 { 428 sock_hold(sk); 429 bh_lock_sock(sk); 430 __x25_destroy_socket(sk); 431 bh_unlock_sock(sk); 432 sock_put(sk); 433 } 434 435 /* 436 * Handling for system calls applied via the various interfaces to a 437 * X.25 socket object. 438 */ 439 440 static int x25_setsockopt(struct socket *sock, int level, int optname, 441 char __user *optval, unsigned int optlen) 442 { 443 int opt; 444 struct sock *sk = sock->sk; 445 int rc = -ENOPROTOOPT; 446 447 if (level != SOL_X25 || optname != X25_QBITINCL) 448 goto out; 449 450 rc = -EINVAL; 451 if (optlen < sizeof(int)) 452 goto out; 453 454 rc = -EFAULT; 455 if (get_user(opt, (int __user *)optval)) 456 goto out; 457 458 if (opt) 459 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 460 else 461 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 462 rc = 0; 463 out: 464 return rc; 465 } 466 467 static int x25_getsockopt(struct socket *sock, int level, int optname, 468 char __user *optval, int __user *optlen) 469 { 470 struct sock *sk = sock->sk; 471 int val, len, rc = -ENOPROTOOPT; 472 473 if (level != SOL_X25 || optname != X25_QBITINCL) 474 goto out; 475 476 rc = -EFAULT; 477 if (get_user(len, optlen)) 478 goto out; 479 480 len = min_t(unsigned int, len, sizeof(int)); 481 482 rc = -EINVAL; 483 if (len < 0) 484 goto out; 485 486 rc = -EFAULT; 487 if (put_user(len, optlen)) 488 goto out; 489 490 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 491 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 492 out: 493 return rc; 494 } 495 496 static int x25_listen(struct socket *sock, int backlog) 497 { 498 struct sock *sk = sock->sk; 499 int rc = -EOPNOTSUPP; 500 501 lock_sock(sk); 502 if (sk->sk_state != TCP_LISTEN) { 503 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 504 sk->sk_max_ack_backlog = backlog; 505 sk->sk_state = TCP_LISTEN; 506 rc = 0; 507 } 508 release_sock(sk); 509 510 return rc; 511 } 512 513 static struct proto x25_proto = { 514 .name = "X25", 515 .owner = THIS_MODULE, 516 .obj_size = sizeof(struct x25_sock), 517 }; 518 519 static struct sock *x25_alloc_socket(struct net *net, int kern) 520 { 521 struct x25_sock *x25; 522 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 523 524 if (!sk) 525 goto out; 526 527 sock_init_data(NULL, sk); 528 529 x25 = x25_sk(sk); 530 skb_queue_head_init(&x25->ack_queue); 531 skb_queue_head_init(&x25->fragment_queue); 532 skb_queue_head_init(&x25->interrupt_in_queue); 533 skb_queue_head_init(&x25->interrupt_out_queue); 534 out: 535 return sk; 536 } 537 538 static int x25_create(struct net *net, struct socket *sock, int protocol, 539 int kern) 540 { 541 struct sock *sk; 542 struct x25_sock *x25; 543 int rc = -EAFNOSUPPORT; 544 545 if (!net_eq(net, &init_net)) 546 goto out; 547 548 rc = -ESOCKTNOSUPPORT; 549 if (sock->type != SOCK_SEQPACKET) 550 goto out; 551 552 rc = -EINVAL; 553 if (protocol) 554 goto out; 555 556 rc = -ENOBUFS; 557 if ((sk = x25_alloc_socket(net, kern)) == NULL) 558 goto out; 559 560 x25 = x25_sk(sk); 561 562 sock_init_data(sock, sk); 563 564 x25_init_timers(sk); 565 566 sock->ops = &x25_proto_ops; 567 sk->sk_protocol = protocol; 568 sk->sk_backlog_rcv = x25_backlog_rcv; 569 570 x25->t21 = sysctl_x25_call_request_timeout; 571 x25->t22 = sysctl_x25_reset_request_timeout; 572 x25->t23 = sysctl_x25_clear_request_timeout; 573 x25->t2 = sysctl_x25_ack_holdback_timeout; 574 x25->state = X25_STATE_0; 575 x25->cudmatchlength = 0; 576 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 577 /* on call accept */ 578 579 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 580 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 581 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 582 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 583 x25->facilities.throughput = 0; /* by default don't negotiate 584 throughput */ 585 x25->facilities.reverse = X25_DEFAULT_REVERSE; 586 x25->dte_facilities.calling_len = 0; 587 x25->dte_facilities.called_len = 0; 588 memset(x25->dte_facilities.called_ae, '\0', 589 sizeof(x25->dte_facilities.called_ae)); 590 memset(x25->dte_facilities.calling_ae, '\0', 591 sizeof(x25->dte_facilities.calling_ae)); 592 593 rc = 0; 594 out: 595 return rc; 596 } 597 598 static struct sock *x25_make_new(struct sock *osk) 599 { 600 struct sock *sk = NULL; 601 struct x25_sock *x25, *ox25; 602 603 if (osk->sk_type != SOCK_SEQPACKET) 604 goto out; 605 606 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 607 goto out; 608 609 x25 = x25_sk(sk); 610 611 sk->sk_type = osk->sk_type; 612 sk->sk_priority = osk->sk_priority; 613 sk->sk_protocol = osk->sk_protocol; 614 sk->sk_rcvbuf = osk->sk_rcvbuf; 615 sk->sk_sndbuf = osk->sk_sndbuf; 616 sk->sk_state = TCP_ESTABLISHED; 617 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 618 sock_copy_flags(sk, osk); 619 620 ox25 = x25_sk(osk); 621 x25->t21 = ox25->t21; 622 x25->t22 = ox25->t22; 623 x25->t23 = ox25->t23; 624 x25->t2 = ox25->t2; 625 x25->flags = ox25->flags; 626 x25->facilities = ox25->facilities; 627 x25->dte_facilities = ox25->dte_facilities; 628 x25->cudmatchlength = ox25->cudmatchlength; 629 630 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 631 x25_init_timers(sk); 632 out: 633 return sk; 634 } 635 636 static int x25_release(struct socket *sock) 637 { 638 struct sock *sk = sock->sk; 639 struct x25_sock *x25; 640 641 if (!sk) 642 return 0; 643 644 x25 = x25_sk(sk); 645 646 sock_hold(sk); 647 lock_sock(sk); 648 switch (x25->state) { 649 650 case X25_STATE_0: 651 case X25_STATE_2: 652 x25_disconnect(sk, 0, 0, 0); 653 __x25_destroy_socket(sk); 654 goto out; 655 656 case X25_STATE_1: 657 case X25_STATE_3: 658 case X25_STATE_4: 659 x25_clear_queues(sk); 660 x25_write_internal(sk, X25_CLEAR_REQUEST); 661 x25_start_t23timer(sk); 662 x25->state = X25_STATE_2; 663 sk->sk_state = TCP_CLOSE; 664 sk->sk_shutdown |= SEND_SHUTDOWN; 665 sk->sk_state_change(sk); 666 sock_set_flag(sk, SOCK_DEAD); 667 sock_set_flag(sk, SOCK_DESTROY); 668 break; 669 } 670 671 sock_orphan(sk); 672 out: 673 release_sock(sk); 674 sock_put(sk); 675 return 0; 676 } 677 678 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 679 { 680 struct sock *sk = sock->sk; 681 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 682 int len, i, rc = 0; 683 684 if (!sock_flag(sk, SOCK_ZAPPED) || 685 addr_len != sizeof(struct sockaddr_x25) || 686 addr->sx25_family != AF_X25) { 687 rc = -EINVAL; 688 goto out; 689 } 690 691 len = strlen(addr->sx25_addr.x25_addr); 692 for (i = 0; i < len; i++) { 693 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 694 rc = -EINVAL; 695 goto out; 696 } 697 } 698 699 lock_sock(sk); 700 x25_sk(sk)->source_addr = addr->sx25_addr; 701 x25_insert_socket(sk); 702 sock_reset_flag(sk, SOCK_ZAPPED); 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 x25_neigh_put(x25->neighbour); 820 out_put_route: 821 x25_route_put(rt); 822 out: 823 release_sock(sk); 824 return rc; 825 } 826 827 static int x25_wait_for_data(struct sock *sk, long timeout) 828 { 829 DECLARE_WAITQUEUE(wait, current); 830 int rc = 0; 831 832 add_wait_queue_exclusive(sk_sleep(sk), &wait); 833 for (;;) { 834 __set_current_state(TASK_INTERRUPTIBLE); 835 if (sk->sk_shutdown & RCV_SHUTDOWN) 836 break; 837 rc = -ERESTARTSYS; 838 if (signal_pending(current)) 839 break; 840 rc = -EAGAIN; 841 if (!timeout) 842 break; 843 rc = 0; 844 if (skb_queue_empty(&sk->sk_receive_queue)) { 845 release_sock(sk); 846 timeout = schedule_timeout(timeout); 847 lock_sock(sk); 848 } else 849 break; 850 } 851 __set_current_state(TASK_RUNNING); 852 remove_wait_queue(sk_sleep(sk), &wait); 853 return rc; 854 } 855 856 static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 857 bool kern) 858 { 859 struct sock *sk = sock->sk; 860 struct sock *newsk; 861 struct sk_buff *skb; 862 int rc = -EINVAL; 863 864 if (!sk) 865 goto out; 866 867 rc = -EOPNOTSUPP; 868 if (sk->sk_type != SOCK_SEQPACKET) 869 goto out; 870 871 lock_sock(sk); 872 rc = -EINVAL; 873 if (sk->sk_state != TCP_LISTEN) 874 goto out2; 875 876 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 877 if (rc) 878 goto out2; 879 skb = skb_dequeue(&sk->sk_receive_queue); 880 rc = -EINVAL; 881 if (!skb->sk) 882 goto out2; 883 newsk = skb->sk; 884 sock_graft(newsk, newsock); 885 886 /* Now attach up the new socket */ 887 skb->sk = NULL; 888 kfree_skb(skb); 889 sk->sk_ack_backlog--; 890 newsock->state = SS_CONNECTED; 891 rc = 0; 892 out2: 893 release_sock(sk); 894 out: 895 return rc; 896 } 897 898 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 899 int peer) 900 { 901 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 902 struct sock *sk = sock->sk; 903 struct x25_sock *x25 = x25_sk(sk); 904 int rc = 0; 905 906 if (peer) { 907 if (sk->sk_state != TCP_ESTABLISHED) { 908 rc = -ENOTCONN; 909 goto out; 910 } 911 sx25->sx25_addr = x25->dest_addr; 912 } else 913 sx25->sx25_addr = x25->source_addr; 914 915 sx25->sx25_family = AF_X25; 916 rc = sizeof(*sx25); 917 918 out: 919 return rc; 920 } 921 922 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 923 unsigned int lci) 924 { 925 struct sock *sk; 926 struct sock *make; 927 struct x25_sock *makex25; 928 struct x25_address source_addr, dest_addr; 929 struct x25_facilities facilities; 930 struct x25_dte_facilities dte_facilities; 931 int len, addr_len, rc; 932 933 /* 934 * Remove the LCI and frame type. 935 */ 936 skb_pull(skb, X25_STD_MIN_LEN); 937 938 /* 939 * Extract the X.25 addresses and convert them to ASCII strings, 940 * and remove them. 941 * 942 * Address block is mandatory in call request packets 943 */ 944 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 945 if (addr_len <= 0) 946 goto out_clear_request; 947 skb_pull(skb, addr_len); 948 949 /* 950 * Get the length of the facilities, skip past them for the moment 951 * get the call user data because this is needed to determine 952 * the correct listener 953 * 954 * Facilities length is mandatory in call request packets 955 */ 956 if (!pskb_may_pull(skb, 1)) 957 goto out_clear_request; 958 len = skb->data[0] + 1; 959 if (!pskb_may_pull(skb, len)) 960 goto out_clear_request; 961 skb_pull(skb,len); 962 963 /* 964 * Ensure that the amount of call user data is valid. 965 */ 966 if (skb->len > X25_MAX_CUD_LEN) 967 goto out_clear_request; 968 969 /* 970 * Get all the call user data so it can be used in 971 * x25_find_listener and skb_copy_from_linear_data up ahead. 972 */ 973 if (!pskb_may_pull(skb, skb->len)) 974 goto out_clear_request; 975 976 /* 977 * Find a listener for the particular address/cud pair. 978 */ 979 sk = x25_find_listener(&source_addr,skb); 980 skb_push(skb,len); 981 982 if (sk != NULL && sk_acceptq_is_full(sk)) { 983 goto out_sock_put; 984 } 985 986 /* 987 * We dont have any listeners for this incoming call. 988 * Try forwarding it. 989 */ 990 if (sk == NULL) { 991 skb_push(skb, addr_len + X25_STD_MIN_LEN); 992 if (sysctl_x25_forward && 993 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 994 { 995 /* Call was forwarded, dont process it any more */ 996 kfree_skb(skb); 997 rc = 1; 998 goto out; 999 } else { 1000 /* No listeners, can't forward, clear the call */ 1001 goto out_clear_request; 1002 } 1003 } 1004 1005 /* 1006 * Try to reach a compromise on the requested facilities. 1007 */ 1008 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1009 if (len == -1) 1010 goto out_sock_put; 1011 1012 /* 1013 * current neighbour/link might impose additional limits 1014 * on certain facilties 1015 */ 1016 1017 x25_limit_facilities(&facilities, nb); 1018 1019 /* 1020 * Try to create a new socket. 1021 */ 1022 make = x25_make_new(sk); 1023 if (!make) 1024 goto out_sock_put; 1025 1026 /* 1027 * Remove the facilities 1028 */ 1029 skb_pull(skb, len); 1030 1031 skb->sk = make; 1032 make->sk_state = TCP_ESTABLISHED; 1033 1034 makex25 = x25_sk(make); 1035 makex25->lci = lci; 1036 makex25->dest_addr = dest_addr; 1037 makex25->source_addr = source_addr; 1038 makex25->neighbour = nb; 1039 makex25->facilities = facilities; 1040 makex25->dte_facilities= dte_facilities; 1041 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1042 /* ensure no reverse facil on accept */ 1043 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1044 /* ensure no calling address extension on accept */ 1045 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1046 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1047 1048 /* Normally all calls are accepted immediately */ 1049 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1050 x25_write_internal(make, X25_CALL_ACCEPTED); 1051 makex25->state = X25_STATE_3; 1052 } 1053 1054 /* 1055 * Incoming Call User Data. 1056 */ 1057 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1058 makex25->calluserdata.cudlength = skb->len; 1059 1060 sk->sk_ack_backlog++; 1061 1062 x25_insert_socket(make); 1063 1064 skb_queue_head(&sk->sk_receive_queue, skb); 1065 1066 x25_start_heartbeat(make); 1067 1068 if (!sock_flag(sk, SOCK_DEAD)) 1069 sk->sk_data_ready(sk); 1070 rc = 1; 1071 sock_put(sk); 1072 out: 1073 return rc; 1074 out_sock_put: 1075 sock_put(sk); 1076 out_clear_request: 1077 rc = 0; 1078 x25_transmit_clear_request(nb, lci, 0x01); 1079 goto out; 1080 } 1081 1082 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1083 { 1084 struct sock *sk = sock->sk; 1085 struct x25_sock *x25 = x25_sk(sk); 1086 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1087 struct sockaddr_x25 sx25; 1088 struct sk_buff *skb; 1089 unsigned char *asmptr; 1090 int noblock = msg->msg_flags & MSG_DONTWAIT; 1091 size_t size; 1092 int qbit = 0, rc = -EINVAL; 1093 1094 lock_sock(sk); 1095 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1096 goto out; 1097 1098 /* we currently don't support segmented records at the user interface */ 1099 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1100 goto out; 1101 1102 rc = -EADDRNOTAVAIL; 1103 if (sock_flag(sk, SOCK_ZAPPED)) 1104 goto out; 1105 1106 rc = -EPIPE; 1107 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1108 send_sig(SIGPIPE, current, 0); 1109 goto out; 1110 } 1111 1112 rc = -ENETUNREACH; 1113 if (!x25->neighbour) 1114 goto out; 1115 1116 if (usx25) { 1117 rc = -EINVAL; 1118 if (msg->msg_namelen < sizeof(sx25)) 1119 goto out; 1120 memcpy(&sx25, usx25, sizeof(sx25)); 1121 rc = -EISCONN; 1122 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1123 goto out; 1124 rc = -EINVAL; 1125 if (sx25.sx25_family != AF_X25) 1126 goto out; 1127 } else { 1128 /* 1129 * FIXME 1003.1g - if the socket is like this because 1130 * it has become closed (not started closed) we ought 1131 * to SIGPIPE, EPIPE; 1132 */ 1133 rc = -ENOTCONN; 1134 if (sk->sk_state != TCP_ESTABLISHED) 1135 goto out; 1136 1137 sx25.sx25_family = AF_X25; 1138 sx25.sx25_addr = x25->dest_addr; 1139 } 1140 1141 /* Sanity check the packet size */ 1142 if (len > 65535) { 1143 rc = -EMSGSIZE; 1144 goto out; 1145 } 1146 1147 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1148 1149 /* Build a packet */ 1150 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1151 1152 if ((msg->msg_flags & MSG_OOB) && len > 32) 1153 len = 32; 1154 1155 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1156 1157 release_sock(sk); 1158 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1159 lock_sock(sk); 1160 if (!skb) 1161 goto out; 1162 X25_SKB_CB(skb)->flags = msg->msg_flags; 1163 1164 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1165 1166 /* 1167 * Put the data on the end 1168 */ 1169 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1170 1171 skb_reset_transport_header(skb); 1172 skb_put(skb, len); 1173 1174 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1175 if (rc) 1176 goto out_kfree_skb; 1177 1178 /* 1179 * If the Q BIT Include socket option is in force, the first 1180 * byte of the user data is the logical value of the Q Bit. 1181 */ 1182 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1183 if (!pskb_may_pull(skb, 1)) 1184 goto out_kfree_skb; 1185 1186 qbit = skb->data[0]; 1187 skb_pull(skb, 1); 1188 } 1189 1190 /* 1191 * Push down the X.25 header 1192 */ 1193 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1194 1195 if (msg->msg_flags & MSG_OOB) { 1196 if (x25->neighbour->extended) { 1197 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1198 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1199 *asmptr++ = (x25->lci >> 0) & 0xFF; 1200 *asmptr++ = X25_INTERRUPT; 1201 } else { 1202 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1203 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1204 *asmptr++ = (x25->lci >> 0) & 0xFF; 1205 *asmptr++ = X25_INTERRUPT; 1206 } 1207 } else { 1208 if (x25->neighbour->extended) { 1209 /* Build an Extended X.25 header */ 1210 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1211 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1212 *asmptr++ = (x25->lci >> 0) & 0xFF; 1213 *asmptr++ = X25_DATA; 1214 *asmptr++ = X25_DATA; 1215 } else { 1216 /* Build an Standard X.25 header */ 1217 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1218 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1219 *asmptr++ = (x25->lci >> 0) & 0xFF; 1220 *asmptr++ = X25_DATA; 1221 } 1222 1223 if (qbit) 1224 skb->data[0] |= X25_Q_BIT; 1225 } 1226 1227 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1228 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1229 1230 rc = -ENOTCONN; 1231 if (sk->sk_state != TCP_ESTABLISHED) 1232 goto out_kfree_skb; 1233 1234 if (msg->msg_flags & MSG_OOB) 1235 skb_queue_tail(&x25->interrupt_out_queue, skb); 1236 else { 1237 rc = x25_output(sk, skb); 1238 len = rc; 1239 if (rc < 0) 1240 kfree_skb(skb); 1241 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1242 len++; 1243 } 1244 1245 x25_kick(sk); 1246 rc = len; 1247 out: 1248 release_sock(sk); 1249 return rc; 1250 out_kfree_skb: 1251 kfree_skb(skb); 1252 goto out; 1253 } 1254 1255 1256 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1257 int flags) 1258 { 1259 struct sock *sk = sock->sk; 1260 struct x25_sock *x25 = x25_sk(sk); 1261 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1262 size_t copied; 1263 int qbit, header_len; 1264 struct sk_buff *skb; 1265 unsigned char *asmptr; 1266 int rc = -ENOTCONN; 1267 1268 lock_sock(sk); 1269 1270 if (x25->neighbour == NULL) 1271 goto out; 1272 1273 header_len = x25->neighbour->extended ? 1274 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1275 1276 /* 1277 * This works for seqpacket too. The receiver has ordered the queue for 1278 * us! We do one quick check first though 1279 */ 1280 if (sk->sk_state != TCP_ESTABLISHED) 1281 goto out; 1282 1283 if (flags & MSG_OOB) { 1284 rc = -EINVAL; 1285 if (sock_flag(sk, SOCK_URGINLINE) || 1286 !skb_peek(&x25->interrupt_in_queue)) 1287 goto out; 1288 1289 skb = skb_dequeue(&x25->interrupt_in_queue); 1290 1291 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1292 goto out_free_dgram; 1293 1294 skb_pull(skb, X25_STD_MIN_LEN); 1295 1296 /* 1297 * No Q bit information on Interrupt data. 1298 */ 1299 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1300 asmptr = skb_push(skb, 1); 1301 *asmptr = 0x00; 1302 } 1303 1304 msg->msg_flags |= MSG_OOB; 1305 } else { 1306 /* Now we can treat all alike */ 1307 release_sock(sk); 1308 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1309 flags & MSG_DONTWAIT, &rc); 1310 lock_sock(sk); 1311 if (!skb) 1312 goto out; 1313 1314 if (!pskb_may_pull(skb, header_len)) 1315 goto out_free_dgram; 1316 1317 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1318 1319 skb_pull(skb, header_len); 1320 1321 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1322 asmptr = skb_push(skb, 1); 1323 *asmptr = qbit; 1324 } 1325 } 1326 1327 skb_reset_transport_header(skb); 1328 copied = skb->len; 1329 1330 if (copied > size) { 1331 copied = size; 1332 msg->msg_flags |= MSG_TRUNC; 1333 } 1334 1335 /* Currently, each datagram always contains a complete record */ 1336 msg->msg_flags |= MSG_EOR; 1337 1338 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1339 if (rc) 1340 goto out_free_dgram; 1341 1342 if (sx25) { 1343 sx25->sx25_family = AF_X25; 1344 sx25->sx25_addr = x25->dest_addr; 1345 msg->msg_namelen = sizeof(*sx25); 1346 } 1347 1348 x25_check_rbuf(sk); 1349 rc = copied; 1350 out_free_dgram: 1351 skb_free_datagram(sk, skb); 1352 out: 1353 release_sock(sk); 1354 return rc; 1355 } 1356 1357 1358 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1359 { 1360 struct sock *sk = sock->sk; 1361 struct x25_sock *x25 = x25_sk(sk); 1362 void __user *argp = (void __user *)arg; 1363 int rc; 1364 1365 switch (cmd) { 1366 case TIOCOUTQ: { 1367 int amount; 1368 1369 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1370 if (amount < 0) 1371 amount = 0; 1372 rc = put_user(amount, (unsigned int __user *)argp); 1373 break; 1374 } 1375 1376 case TIOCINQ: { 1377 struct sk_buff *skb; 1378 int amount = 0; 1379 /* 1380 * These two are safe on a single CPU system as 1381 * only user tasks fiddle here 1382 */ 1383 lock_sock(sk); 1384 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1385 amount = skb->len; 1386 release_sock(sk); 1387 rc = put_user(amount, (unsigned int __user *)argp); 1388 break; 1389 } 1390 1391 case SIOCGSTAMP: 1392 rc = -EINVAL; 1393 if (sk) 1394 rc = sock_get_timestamp(sk, 1395 (struct timeval __user *)argp); 1396 break; 1397 case SIOCGSTAMPNS: 1398 rc = -EINVAL; 1399 if (sk) 1400 rc = sock_get_timestampns(sk, 1401 (struct timespec __user *)argp); 1402 break; 1403 case SIOCGIFADDR: 1404 case SIOCSIFADDR: 1405 case SIOCGIFDSTADDR: 1406 case SIOCSIFDSTADDR: 1407 case SIOCGIFBRDADDR: 1408 case SIOCSIFBRDADDR: 1409 case SIOCGIFNETMASK: 1410 case SIOCSIFNETMASK: 1411 case SIOCGIFMETRIC: 1412 case SIOCSIFMETRIC: 1413 rc = -EINVAL; 1414 break; 1415 case SIOCADDRT: 1416 case SIOCDELRT: 1417 rc = -EPERM; 1418 if (!capable(CAP_NET_ADMIN)) 1419 break; 1420 rc = x25_route_ioctl(cmd, argp); 1421 break; 1422 case SIOCX25GSUBSCRIP: 1423 rc = x25_subscr_ioctl(cmd, argp); 1424 break; 1425 case SIOCX25SSUBSCRIP: 1426 rc = -EPERM; 1427 if (!capable(CAP_NET_ADMIN)) 1428 break; 1429 rc = x25_subscr_ioctl(cmd, argp); 1430 break; 1431 case SIOCX25GFACILITIES: { 1432 lock_sock(sk); 1433 rc = copy_to_user(argp, &x25->facilities, 1434 sizeof(x25->facilities)) 1435 ? -EFAULT : 0; 1436 release_sock(sk); 1437 break; 1438 } 1439 1440 case SIOCX25SFACILITIES: { 1441 struct x25_facilities facilities; 1442 rc = -EFAULT; 1443 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1444 break; 1445 rc = -EINVAL; 1446 lock_sock(sk); 1447 if (sk->sk_state != TCP_LISTEN && 1448 sk->sk_state != TCP_CLOSE) 1449 goto out_fac_release; 1450 if (facilities.pacsize_in < X25_PS16 || 1451 facilities.pacsize_in > X25_PS4096) 1452 goto out_fac_release; 1453 if (facilities.pacsize_out < X25_PS16 || 1454 facilities.pacsize_out > X25_PS4096) 1455 goto out_fac_release; 1456 if (facilities.winsize_in < 1 || 1457 facilities.winsize_in > 127) 1458 goto out_fac_release; 1459 if (facilities.throughput) { 1460 int out = facilities.throughput & 0xf0; 1461 int in = facilities.throughput & 0x0f; 1462 if (!out) 1463 facilities.throughput |= 1464 X25_DEFAULT_THROUGHPUT << 4; 1465 else if (out < 0x30 || out > 0xD0) 1466 goto out_fac_release; 1467 if (!in) 1468 facilities.throughput |= 1469 X25_DEFAULT_THROUGHPUT; 1470 else if (in < 0x03 || in > 0x0D) 1471 goto out_fac_release; 1472 } 1473 if (facilities.reverse && 1474 (facilities.reverse & 0x81) != 0x81) 1475 goto out_fac_release; 1476 x25->facilities = facilities; 1477 rc = 0; 1478 out_fac_release: 1479 release_sock(sk); 1480 break; 1481 } 1482 1483 case SIOCX25GDTEFACILITIES: { 1484 lock_sock(sk); 1485 rc = copy_to_user(argp, &x25->dte_facilities, 1486 sizeof(x25->dte_facilities)); 1487 release_sock(sk); 1488 if (rc) 1489 rc = -EFAULT; 1490 break; 1491 } 1492 1493 case SIOCX25SDTEFACILITIES: { 1494 struct x25_dte_facilities dtefacs; 1495 rc = -EFAULT; 1496 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1497 break; 1498 rc = -EINVAL; 1499 lock_sock(sk); 1500 if (sk->sk_state != TCP_LISTEN && 1501 sk->sk_state != TCP_CLOSE) 1502 goto out_dtefac_release; 1503 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1504 goto out_dtefac_release; 1505 if (dtefacs.called_len > X25_MAX_AE_LEN) 1506 goto out_dtefac_release; 1507 x25->dte_facilities = dtefacs; 1508 rc = 0; 1509 out_dtefac_release: 1510 release_sock(sk); 1511 break; 1512 } 1513 1514 case SIOCX25GCALLUSERDATA: { 1515 lock_sock(sk); 1516 rc = copy_to_user(argp, &x25->calluserdata, 1517 sizeof(x25->calluserdata)) 1518 ? -EFAULT : 0; 1519 release_sock(sk); 1520 break; 1521 } 1522 1523 case SIOCX25SCALLUSERDATA: { 1524 struct x25_calluserdata calluserdata; 1525 1526 rc = -EFAULT; 1527 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1528 break; 1529 rc = -EINVAL; 1530 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1531 break; 1532 lock_sock(sk); 1533 x25->calluserdata = calluserdata; 1534 release_sock(sk); 1535 rc = 0; 1536 break; 1537 } 1538 1539 case SIOCX25GCAUSEDIAG: { 1540 lock_sock(sk); 1541 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1542 ? -EFAULT : 0; 1543 release_sock(sk); 1544 break; 1545 } 1546 1547 case SIOCX25SCAUSEDIAG: { 1548 struct x25_causediag causediag; 1549 rc = -EFAULT; 1550 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1551 break; 1552 lock_sock(sk); 1553 x25->causediag = causediag; 1554 release_sock(sk); 1555 rc = 0; 1556 break; 1557 1558 } 1559 1560 case SIOCX25SCUDMATCHLEN: { 1561 struct x25_subaddr sub_addr; 1562 rc = -EINVAL; 1563 lock_sock(sk); 1564 if(sk->sk_state != TCP_CLOSE) 1565 goto out_cud_release; 1566 rc = -EFAULT; 1567 if (copy_from_user(&sub_addr, argp, 1568 sizeof(sub_addr))) 1569 goto out_cud_release; 1570 rc = -EINVAL; 1571 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1572 goto out_cud_release; 1573 x25->cudmatchlength = sub_addr.cudmatchlength; 1574 rc = 0; 1575 out_cud_release: 1576 release_sock(sk); 1577 break; 1578 } 1579 1580 case SIOCX25CALLACCPTAPPRV: { 1581 rc = -EINVAL; 1582 lock_sock(sk); 1583 if (sk->sk_state == TCP_CLOSE) { 1584 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1585 rc = 0; 1586 } 1587 release_sock(sk); 1588 break; 1589 } 1590 1591 case SIOCX25SENDCALLACCPT: { 1592 rc = -EINVAL; 1593 lock_sock(sk); 1594 if (sk->sk_state != TCP_ESTABLISHED) 1595 goto out_sendcallaccpt_release; 1596 /* must call accptapprv above */ 1597 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1598 goto out_sendcallaccpt_release; 1599 x25_write_internal(sk, X25_CALL_ACCEPTED); 1600 x25->state = X25_STATE_3; 1601 rc = 0; 1602 out_sendcallaccpt_release: 1603 release_sock(sk); 1604 break; 1605 } 1606 1607 default: 1608 rc = -ENOIOCTLCMD; 1609 break; 1610 } 1611 1612 return rc; 1613 } 1614 1615 static const struct net_proto_family x25_family_ops = { 1616 .family = AF_X25, 1617 .create = x25_create, 1618 .owner = THIS_MODULE, 1619 }; 1620 1621 #ifdef CONFIG_COMPAT 1622 static int compat_x25_subscr_ioctl(unsigned int cmd, 1623 struct compat_x25_subscrip_struct __user *x25_subscr32) 1624 { 1625 struct compat_x25_subscrip_struct x25_subscr; 1626 struct x25_neigh *nb; 1627 struct net_device *dev; 1628 int rc = -EINVAL; 1629 1630 rc = -EFAULT; 1631 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1632 goto out; 1633 1634 rc = -EINVAL; 1635 dev = x25_dev_get(x25_subscr.device); 1636 if (dev == NULL) 1637 goto out; 1638 1639 nb = x25_get_neigh(dev); 1640 if (nb == NULL) 1641 goto out_dev_put; 1642 1643 dev_put(dev); 1644 1645 if (cmd == SIOCX25GSUBSCRIP) { 1646 read_lock_bh(&x25_neigh_list_lock); 1647 x25_subscr.extended = nb->extended; 1648 x25_subscr.global_facil_mask = nb->global_facil_mask; 1649 read_unlock_bh(&x25_neigh_list_lock); 1650 rc = copy_to_user(x25_subscr32, &x25_subscr, 1651 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1652 } else { 1653 rc = -EINVAL; 1654 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1655 rc = 0; 1656 write_lock_bh(&x25_neigh_list_lock); 1657 nb->extended = x25_subscr.extended; 1658 nb->global_facil_mask = x25_subscr.global_facil_mask; 1659 write_unlock_bh(&x25_neigh_list_lock); 1660 } 1661 } 1662 x25_neigh_put(nb); 1663 out: 1664 return rc; 1665 out_dev_put: 1666 dev_put(dev); 1667 goto out; 1668 } 1669 1670 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1671 unsigned long arg) 1672 { 1673 void __user *argp = compat_ptr(arg); 1674 struct sock *sk = sock->sk; 1675 1676 int rc = -ENOIOCTLCMD; 1677 1678 switch(cmd) { 1679 case TIOCOUTQ: 1680 case TIOCINQ: 1681 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1682 break; 1683 case SIOCGSTAMP: 1684 rc = -EINVAL; 1685 if (sk) 1686 rc = compat_sock_get_timestamp(sk, 1687 (struct timeval __user*)argp); 1688 break; 1689 case SIOCGSTAMPNS: 1690 rc = -EINVAL; 1691 if (sk) 1692 rc = compat_sock_get_timestampns(sk, 1693 (struct timespec __user*)argp); 1694 break; 1695 case SIOCGIFADDR: 1696 case SIOCSIFADDR: 1697 case SIOCGIFDSTADDR: 1698 case SIOCSIFDSTADDR: 1699 case SIOCGIFBRDADDR: 1700 case SIOCSIFBRDADDR: 1701 case SIOCGIFNETMASK: 1702 case SIOCSIFNETMASK: 1703 case SIOCGIFMETRIC: 1704 case SIOCSIFMETRIC: 1705 rc = -EINVAL; 1706 break; 1707 case SIOCADDRT: 1708 case SIOCDELRT: 1709 rc = -EPERM; 1710 if (!capable(CAP_NET_ADMIN)) 1711 break; 1712 rc = x25_route_ioctl(cmd, argp); 1713 break; 1714 case SIOCX25GSUBSCRIP: 1715 rc = compat_x25_subscr_ioctl(cmd, argp); 1716 break; 1717 case SIOCX25SSUBSCRIP: 1718 rc = -EPERM; 1719 if (!capable(CAP_NET_ADMIN)) 1720 break; 1721 rc = compat_x25_subscr_ioctl(cmd, argp); 1722 break; 1723 case SIOCX25GFACILITIES: 1724 case SIOCX25SFACILITIES: 1725 case SIOCX25GDTEFACILITIES: 1726 case SIOCX25SDTEFACILITIES: 1727 case SIOCX25GCALLUSERDATA: 1728 case SIOCX25SCALLUSERDATA: 1729 case SIOCX25GCAUSEDIAG: 1730 case SIOCX25SCAUSEDIAG: 1731 case SIOCX25SCUDMATCHLEN: 1732 case SIOCX25CALLACCPTAPPRV: 1733 case SIOCX25SENDCALLACCPT: 1734 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1735 break; 1736 default: 1737 rc = -ENOIOCTLCMD; 1738 break; 1739 } 1740 return rc; 1741 } 1742 #endif 1743 1744 static const struct proto_ops x25_proto_ops = { 1745 .family = AF_X25, 1746 .owner = THIS_MODULE, 1747 .release = x25_release, 1748 .bind = x25_bind, 1749 .connect = x25_connect, 1750 .socketpair = sock_no_socketpair, 1751 .accept = x25_accept, 1752 .getname = x25_getname, 1753 .poll = datagram_poll, 1754 .ioctl = x25_ioctl, 1755 #ifdef CONFIG_COMPAT 1756 .compat_ioctl = compat_x25_ioctl, 1757 #endif 1758 .listen = x25_listen, 1759 .shutdown = sock_no_shutdown, 1760 .setsockopt = x25_setsockopt, 1761 .getsockopt = x25_getsockopt, 1762 .sendmsg = x25_sendmsg, 1763 .recvmsg = x25_recvmsg, 1764 .mmap = sock_no_mmap, 1765 .sendpage = sock_no_sendpage, 1766 }; 1767 1768 static struct packet_type x25_packet_type __read_mostly = { 1769 .type = cpu_to_be16(ETH_P_X25), 1770 .func = x25_lapb_receive_frame, 1771 }; 1772 1773 static struct notifier_block x25_dev_notifier = { 1774 .notifier_call = x25_device_event, 1775 }; 1776 1777 void x25_kill_by_neigh(struct x25_neigh *nb) 1778 { 1779 struct sock *s; 1780 1781 write_lock_bh(&x25_list_lock); 1782 1783 sk_for_each(s, &x25_list) 1784 if (x25_sk(s)->neighbour == nb) 1785 x25_disconnect(s, ENETUNREACH, 0, 0); 1786 1787 write_unlock_bh(&x25_list_lock); 1788 1789 /* Remove any related forwards */ 1790 x25_clear_forward_by_dev(nb->dev); 1791 } 1792 1793 static int __init x25_init(void) 1794 { 1795 int rc; 1796 1797 rc = proto_register(&x25_proto, 0); 1798 if (rc) 1799 goto out; 1800 1801 rc = sock_register(&x25_family_ops); 1802 if (rc) 1803 goto out_proto; 1804 1805 dev_add_pack(&x25_packet_type); 1806 1807 rc = register_netdevice_notifier(&x25_dev_notifier); 1808 if (rc) 1809 goto out_sock; 1810 1811 rc = x25_register_sysctl(); 1812 if (rc) 1813 goto out_dev; 1814 1815 rc = x25_proc_init(); 1816 if (rc) 1817 goto out_sysctl; 1818 1819 pr_info("Linux Version 0.2\n"); 1820 1821 out: 1822 return rc; 1823 out_sysctl: 1824 x25_unregister_sysctl(); 1825 out_dev: 1826 unregister_netdevice_notifier(&x25_dev_notifier); 1827 out_sock: 1828 dev_remove_pack(&x25_packet_type); 1829 sock_unregister(AF_X25); 1830 out_proto: 1831 proto_unregister(&x25_proto); 1832 goto out; 1833 } 1834 module_init(x25_init); 1835 1836 static void __exit x25_exit(void) 1837 { 1838 x25_proc_exit(); 1839 x25_link_free(); 1840 x25_route_free(); 1841 1842 x25_unregister_sysctl(); 1843 1844 unregister_netdevice_notifier(&x25_dev_notifier); 1845 1846 dev_remove_pack(&x25_packet_type); 1847 1848 sock_unregister(AF_X25); 1849 proto_unregister(&x25_proto); 1850 } 1851 module_exit(x25_exit); 1852 1853 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1854 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1855 MODULE_LICENSE("GPL"); 1856 MODULE_ALIAS_NETPROTO(PF_X25); 1857