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) + 1) / 2; 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(x25_sk(s)->source_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 /* check for the null_x25_address */ 692 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { 693 694 len = strlen(addr->sx25_addr.x25_addr); 695 for (i = 0; i < len; i++) { 696 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 697 rc = -EINVAL; 698 goto out; 699 } 700 } 701 } 702 703 lock_sock(sk); 704 x25_sk(sk)->source_addr = addr->sx25_addr; 705 x25_insert_socket(sk); 706 sock_reset_flag(sk, SOCK_ZAPPED); 707 release_sock(sk); 708 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 709 out: 710 return rc; 711 } 712 713 static int x25_wait_for_connection_establishment(struct sock *sk) 714 { 715 DECLARE_WAITQUEUE(wait, current); 716 int rc; 717 718 add_wait_queue_exclusive(sk_sleep(sk), &wait); 719 for (;;) { 720 __set_current_state(TASK_INTERRUPTIBLE); 721 rc = -ERESTARTSYS; 722 if (signal_pending(current)) 723 break; 724 rc = sock_error(sk); 725 if (rc) { 726 sk->sk_socket->state = SS_UNCONNECTED; 727 break; 728 } 729 rc = 0; 730 if (sk->sk_state != TCP_ESTABLISHED) { 731 release_sock(sk); 732 schedule(); 733 lock_sock(sk); 734 } else 735 break; 736 } 737 __set_current_state(TASK_RUNNING); 738 remove_wait_queue(sk_sleep(sk), &wait); 739 return rc; 740 } 741 742 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 743 int addr_len, int flags) 744 { 745 struct sock *sk = sock->sk; 746 struct x25_sock *x25 = x25_sk(sk); 747 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 748 struct x25_route *rt; 749 int rc = 0; 750 751 lock_sock(sk); 752 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 753 sock->state = SS_CONNECTED; 754 goto out; /* Connect completed during a ERESTARTSYS event */ 755 } 756 757 rc = -ECONNREFUSED; 758 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 759 sock->state = SS_UNCONNECTED; 760 goto out; 761 } 762 763 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 764 if (sk->sk_state == TCP_ESTABLISHED) 765 goto out; 766 767 sk->sk_state = TCP_CLOSE; 768 sock->state = SS_UNCONNECTED; 769 770 rc = -EINVAL; 771 if (addr_len != sizeof(struct sockaddr_x25) || 772 addr->sx25_family != AF_X25) 773 goto out; 774 775 rc = -ENETUNREACH; 776 rt = x25_get_route(&addr->sx25_addr); 777 if (!rt) 778 goto out; 779 780 x25->neighbour = x25_get_neigh(rt->dev); 781 if (!x25->neighbour) 782 goto out_put_route; 783 784 x25_limit_facilities(&x25->facilities, x25->neighbour); 785 786 x25->lci = x25_new_lci(x25->neighbour); 787 if (!x25->lci) 788 goto out_put_neigh; 789 790 rc = -EINVAL; 791 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 792 goto out_put_neigh; 793 794 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 795 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 796 797 x25->dest_addr = addr->sx25_addr; 798 799 /* Move to connecting socket, start sending Connect Requests */ 800 sock->state = SS_CONNECTING; 801 sk->sk_state = TCP_SYN_SENT; 802 803 x25->state = X25_STATE_1; 804 805 x25_write_internal(sk, X25_CALL_REQUEST); 806 807 x25_start_heartbeat(sk); 808 x25_start_t21timer(sk); 809 810 /* Now the loop */ 811 rc = -EINPROGRESS; 812 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 813 goto out_put_neigh; 814 815 rc = x25_wait_for_connection_establishment(sk); 816 if (rc) 817 goto out_put_neigh; 818 819 sock->state = SS_CONNECTED; 820 rc = 0; 821 out_put_neigh: 822 if (rc) 823 x25_neigh_put(x25->neighbour); 824 out_put_route: 825 x25_route_put(rt); 826 out: 827 release_sock(sk); 828 return rc; 829 } 830 831 static int x25_wait_for_data(struct sock *sk, long timeout) 832 { 833 DECLARE_WAITQUEUE(wait, current); 834 int rc = 0; 835 836 add_wait_queue_exclusive(sk_sleep(sk), &wait); 837 for (;;) { 838 __set_current_state(TASK_INTERRUPTIBLE); 839 if (sk->sk_shutdown & RCV_SHUTDOWN) 840 break; 841 rc = -ERESTARTSYS; 842 if (signal_pending(current)) 843 break; 844 rc = -EAGAIN; 845 if (!timeout) 846 break; 847 rc = 0; 848 if (skb_queue_empty(&sk->sk_receive_queue)) { 849 release_sock(sk); 850 timeout = schedule_timeout(timeout); 851 lock_sock(sk); 852 } else 853 break; 854 } 855 __set_current_state(TASK_RUNNING); 856 remove_wait_queue(sk_sleep(sk), &wait); 857 return rc; 858 } 859 860 static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 861 bool kern) 862 { 863 struct sock *sk = sock->sk; 864 struct sock *newsk; 865 struct sk_buff *skb; 866 int rc = -EINVAL; 867 868 if (!sk) 869 goto out; 870 871 rc = -EOPNOTSUPP; 872 if (sk->sk_type != SOCK_SEQPACKET) 873 goto out; 874 875 lock_sock(sk); 876 rc = -EINVAL; 877 if (sk->sk_state != TCP_LISTEN) 878 goto out2; 879 880 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 881 if (rc) 882 goto out2; 883 skb = skb_dequeue(&sk->sk_receive_queue); 884 rc = -EINVAL; 885 if (!skb->sk) 886 goto out2; 887 newsk = skb->sk; 888 sock_graft(newsk, newsock); 889 890 /* Now attach up the new socket */ 891 skb->sk = NULL; 892 kfree_skb(skb); 893 sk->sk_ack_backlog--; 894 newsock->state = SS_CONNECTED; 895 rc = 0; 896 out2: 897 release_sock(sk); 898 out: 899 return rc; 900 } 901 902 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 903 int peer) 904 { 905 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 906 struct sock *sk = sock->sk; 907 struct x25_sock *x25 = x25_sk(sk); 908 int rc = 0; 909 910 if (peer) { 911 if (sk->sk_state != TCP_ESTABLISHED) { 912 rc = -ENOTCONN; 913 goto out; 914 } 915 sx25->sx25_addr = x25->dest_addr; 916 } else 917 sx25->sx25_addr = x25->source_addr; 918 919 sx25->sx25_family = AF_X25; 920 rc = sizeof(*sx25); 921 922 out: 923 return rc; 924 } 925 926 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 927 unsigned int lci) 928 { 929 struct sock *sk; 930 struct sock *make; 931 struct x25_sock *makex25; 932 struct x25_address source_addr, dest_addr; 933 struct x25_facilities facilities; 934 struct x25_dte_facilities dte_facilities; 935 int len, addr_len, rc; 936 937 /* 938 * Remove the LCI and frame type. 939 */ 940 skb_pull(skb, X25_STD_MIN_LEN); 941 942 /* 943 * Extract the X.25 addresses and convert them to ASCII strings, 944 * and remove them. 945 * 946 * Address block is mandatory in call request packets 947 */ 948 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 949 if (addr_len <= 0) 950 goto out_clear_request; 951 skb_pull(skb, addr_len); 952 953 /* 954 * Get the length of the facilities, skip past them for the moment 955 * get the call user data because this is needed to determine 956 * the correct listener 957 * 958 * Facilities length is mandatory in call request packets 959 */ 960 if (!pskb_may_pull(skb, 1)) 961 goto out_clear_request; 962 len = skb->data[0] + 1; 963 if (!pskb_may_pull(skb, len)) 964 goto out_clear_request; 965 skb_pull(skb,len); 966 967 /* 968 * Ensure that the amount of call user data is valid. 969 */ 970 if (skb->len > X25_MAX_CUD_LEN) 971 goto out_clear_request; 972 973 /* 974 * Get all the call user data so it can be used in 975 * x25_find_listener and skb_copy_from_linear_data up ahead. 976 */ 977 if (!pskb_may_pull(skb, skb->len)) 978 goto out_clear_request; 979 980 /* 981 * Find a listener for the particular address/cud pair. 982 */ 983 sk = x25_find_listener(&source_addr,skb); 984 skb_push(skb,len); 985 986 if (sk != NULL && sk_acceptq_is_full(sk)) { 987 goto out_sock_put; 988 } 989 990 /* 991 * We dont have any listeners for this incoming call. 992 * Try forwarding it. 993 */ 994 if (sk == NULL) { 995 skb_push(skb, addr_len + X25_STD_MIN_LEN); 996 if (sysctl_x25_forward && 997 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 998 { 999 /* Call was forwarded, dont process it any more */ 1000 kfree_skb(skb); 1001 rc = 1; 1002 goto out; 1003 } else { 1004 /* No listeners, can't forward, clear the call */ 1005 goto out_clear_request; 1006 } 1007 } 1008 1009 /* 1010 * Try to reach a compromise on the requested facilities. 1011 */ 1012 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1013 if (len == -1) 1014 goto out_sock_put; 1015 1016 /* 1017 * current neighbour/link might impose additional limits 1018 * on certain facilties 1019 */ 1020 1021 x25_limit_facilities(&facilities, nb); 1022 1023 /* 1024 * Try to create a new socket. 1025 */ 1026 make = x25_make_new(sk); 1027 if (!make) 1028 goto out_sock_put; 1029 1030 /* 1031 * Remove the facilities 1032 */ 1033 skb_pull(skb, len); 1034 1035 skb->sk = make; 1036 make->sk_state = TCP_ESTABLISHED; 1037 1038 makex25 = x25_sk(make); 1039 makex25->lci = lci; 1040 makex25->dest_addr = dest_addr; 1041 makex25->source_addr = source_addr; 1042 makex25->neighbour = nb; 1043 makex25->facilities = facilities; 1044 makex25->dte_facilities= dte_facilities; 1045 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1046 /* ensure no reverse facil on accept */ 1047 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1048 /* ensure no calling address extension on accept */ 1049 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1050 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1051 1052 /* Normally all calls are accepted immediately */ 1053 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1054 x25_write_internal(make, X25_CALL_ACCEPTED); 1055 makex25->state = X25_STATE_3; 1056 } 1057 1058 /* 1059 * Incoming Call User Data. 1060 */ 1061 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1062 makex25->calluserdata.cudlength = skb->len; 1063 1064 sk->sk_ack_backlog++; 1065 1066 x25_insert_socket(make); 1067 1068 skb_queue_head(&sk->sk_receive_queue, skb); 1069 1070 x25_start_heartbeat(make); 1071 1072 if (!sock_flag(sk, SOCK_DEAD)) 1073 sk->sk_data_ready(sk); 1074 rc = 1; 1075 sock_put(sk); 1076 out: 1077 return rc; 1078 out_sock_put: 1079 sock_put(sk); 1080 out_clear_request: 1081 rc = 0; 1082 x25_transmit_clear_request(nb, lci, 0x01); 1083 goto out; 1084 } 1085 1086 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1087 { 1088 struct sock *sk = sock->sk; 1089 struct x25_sock *x25 = x25_sk(sk); 1090 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1091 struct sockaddr_x25 sx25; 1092 struct sk_buff *skb; 1093 unsigned char *asmptr; 1094 int noblock = msg->msg_flags & MSG_DONTWAIT; 1095 size_t size; 1096 int qbit = 0, rc = -EINVAL; 1097 1098 lock_sock(sk); 1099 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1100 goto out; 1101 1102 /* we currently don't support segmented records at the user interface */ 1103 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1104 goto out; 1105 1106 rc = -EADDRNOTAVAIL; 1107 if (sock_flag(sk, SOCK_ZAPPED)) 1108 goto out; 1109 1110 rc = -EPIPE; 1111 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1112 send_sig(SIGPIPE, current, 0); 1113 goto out; 1114 } 1115 1116 rc = -ENETUNREACH; 1117 if (!x25->neighbour) 1118 goto out; 1119 1120 if (usx25) { 1121 rc = -EINVAL; 1122 if (msg->msg_namelen < sizeof(sx25)) 1123 goto out; 1124 memcpy(&sx25, usx25, sizeof(sx25)); 1125 rc = -EISCONN; 1126 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1127 goto out; 1128 rc = -EINVAL; 1129 if (sx25.sx25_family != AF_X25) 1130 goto out; 1131 } else { 1132 /* 1133 * FIXME 1003.1g - if the socket is like this because 1134 * it has become closed (not started closed) we ought 1135 * to SIGPIPE, EPIPE; 1136 */ 1137 rc = -ENOTCONN; 1138 if (sk->sk_state != TCP_ESTABLISHED) 1139 goto out; 1140 1141 sx25.sx25_family = AF_X25; 1142 sx25.sx25_addr = x25->dest_addr; 1143 } 1144 1145 /* Sanity check the packet size */ 1146 if (len > 65535) { 1147 rc = -EMSGSIZE; 1148 goto out; 1149 } 1150 1151 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1152 1153 /* Build a packet */ 1154 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1155 1156 if ((msg->msg_flags & MSG_OOB) && len > 32) 1157 len = 32; 1158 1159 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1160 1161 release_sock(sk); 1162 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1163 lock_sock(sk); 1164 if (!skb) 1165 goto out; 1166 X25_SKB_CB(skb)->flags = msg->msg_flags; 1167 1168 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1169 1170 /* 1171 * Put the data on the end 1172 */ 1173 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1174 1175 skb_reset_transport_header(skb); 1176 skb_put(skb, len); 1177 1178 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1179 if (rc) 1180 goto out_kfree_skb; 1181 1182 /* 1183 * If the Q BIT Include socket option is in force, the first 1184 * byte of the user data is the logical value of the Q Bit. 1185 */ 1186 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1187 if (!pskb_may_pull(skb, 1)) 1188 goto out_kfree_skb; 1189 1190 qbit = skb->data[0]; 1191 skb_pull(skb, 1); 1192 } 1193 1194 /* 1195 * Push down the X.25 header 1196 */ 1197 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1198 1199 if (msg->msg_flags & MSG_OOB) { 1200 if (x25->neighbour->extended) { 1201 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1202 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1203 *asmptr++ = (x25->lci >> 0) & 0xFF; 1204 *asmptr++ = X25_INTERRUPT; 1205 } else { 1206 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1207 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1208 *asmptr++ = (x25->lci >> 0) & 0xFF; 1209 *asmptr++ = X25_INTERRUPT; 1210 } 1211 } else { 1212 if (x25->neighbour->extended) { 1213 /* Build an Extended X.25 header */ 1214 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1215 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1216 *asmptr++ = (x25->lci >> 0) & 0xFF; 1217 *asmptr++ = X25_DATA; 1218 *asmptr++ = X25_DATA; 1219 } else { 1220 /* Build an Standard X.25 header */ 1221 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1222 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1223 *asmptr++ = (x25->lci >> 0) & 0xFF; 1224 *asmptr++ = X25_DATA; 1225 } 1226 1227 if (qbit) 1228 skb->data[0] |= X25_Q_BIT; 1229 } 1230 1231 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1232 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1233 1234 rc = -ENOTCONN; 1235 if (sk->sk_state != TCP_ESTABLISHED) 1236 goto out_kfree_skb; 1237 1238 if (msg->msg_flags & MSG_OOB) 1239 skb_queue_tail(&x25->interrupt_out_queue, skb); 1240 else { 1241 rc = x25_output(sk, skb); 1242 len = rc; 1243 if (rc < 0) 1244 kfree_skb(skb); 1245 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1246 len++; 1247 } 1248 1249 x25_kick(sk); 1250 rc = len; 1251 out: 1252 release_sock(sk); 1253 return rc; 1254 out_kfree_skb: 1255 kfree_skb(skb); 1256 goto out; 1257 } 1258 1259 1260 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1261 int flags) 1262 { 1263 struct sock *sk = sock->sk; 1264 struct x25_sock *x25 = x25_sk(sk); 1265 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1266 size_t copied; 1267 int qbit, header_len; 1268 struct sk_buff *skb; 1269 unsigned char *asmptr; 1270 int rc = -ENOTCONN; 1271 1272 lock_sock(sk); 1273 1274 if (x25->neighbour == NULL) 1275 goto out; 1276 1277 header_len = x25->neighbour->extended ? 1278 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1279 1280 /* 1281 * This works for seqpacket too. The receiver has ordered the queue for 1282 * us! We do one quick check first though 1283 */ 1284 if (sk->sk_state != TCP_ESTABLISHED) 1285 goto out; 1286 1287 if (flags & MSG_OOB) { 1288 rc = -EINVAL; 1289 if (sock_flag(sk, SOCK_URGINLINE) || 1290 !skb_peek(&x25->interrupt_in_queue)) 1291 goto out; 1292 1293 skb = skb_dequeue(&x25->interrupt_in_queue); 1294 1295 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1296 goto out_free_dgram; 1297 1298 skb_pull(skb, X25_STD_MIN_LEN); 1299 1300 /* 1301 * No Q bit information on Interrupt data. 1302 */ 1303 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1304 asmptr = skb_push(skb, 1); 1305 *asmptr = 0x00; 1306 } 1307 1308 msg->msg_flags |= MSG_OOB; 1309 } else { 1310 /* Now we can treat all alike */ 1311 release_sock(sk); 1312 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1313 flags & MSG_DONTWAIT, &rc); 1314 lock_sock(sk); 1315 if (!skb) 1316 goto out; 1317 1318 if (!pskb_may_pull(skb, header_len)) 1319 goto out_free_dgram; 1320 1321 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1322 1323 skb_pull(skb, header_len); 1324 1325 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1326 asmptr = skb_push(skb, 1); 1327 *asmptr = qbit; 1328 } 1329 } 1330 1331 skb_reset_transport_header(skb); 1332 copied = skb->len; 1333 1334 if (copied > size) { 1335 copied = size; 1336 msg->msg_flags |= MSG_TRUNC; 1337 } 1338 1339 /* Currently, each datagram always contains a complete record */ 1340 msg->msg_flags |= MSG_EOR; 1341 1342 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1343 if (rc) 1344 goto out_free_dgram; 1345 1346 if (sx25) { 1347 sx25->sx25_family = AF_X25; 1348 sx25->sx25_addr = x25->dest_addr; 1349 msg->msg_namelen = sizeof(*sx25); 1350 } 1351 1352 x25_check_rbuf(sk); 1353 rc = copied; 1354 out_free_dgram: 1355 skb_free_datagram(sk, skb); 1356 out: 1357 release_sock(sk); 1358 return rc; 1359 } 1360 1361 1362 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1363 { 1364 struct sock *sk = sock->sk; 1365 struct x25_sock *x25 = x25_sk(sk); 1366 void __user *argp = (void __user *)arg; 1367 int rc; 1368 1369 switch (cmd) { 1370 case TIOCOUTQ: { 1371 int amount; 1372 1373 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1374 if (amount < 0) 1375 amount = 0; 1376 rc = put_user(amount, (unsigned int __user *)argp); 1377 break; 1378 } 1379 1380 case TIOCINQ: { 1381 struct sk_buff *skb; 1382 int amount = 0; 1383 /* 1384 * These two are safe on a single CPU system as 1385 * only user tasks fiddle here 1386 */ 1387 lock_sock(sk); 1388 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1389 amount = skb->len; 1390 release_sock(sk); 1391 rc = put_user(amount, (unsigned int __user *)argp); 1392 break; 1393 } 1394 1395 case SIOCGSTAMP: 1396 rc = -EINVAL; 1397 if (sk) 1398 rc = sock_get_timestamp(sk, 1399 (struct timeval __user *)argp); 1400 break; 1401 case SIOCGSTAMPNS: 1402 rc = -EINVAL; 1403 if (sk) 1404 rc = sock_get_timestampns(sk, 1405 (struct timespec __user *)argp); 1406 break; 1407 case SIOCGIFADDR: 1408 case SIOCSIFADDR: 1409 case SIOCGIFDSTADDR: 1410 case SIOCSIFDSTADDR: 1411 case SIOCGIFBRDADDR: 1412 case SIOCSIFBRDADDR: 1413 case SIOCGIFNETMASK: 1414 case SIOCSIFNETMASK: 1415 case SIOCGIFMETRIC: 1416 case SIOCSIFMETRIC: 1417 rc = -EINVAL; 1418 break; 1419 case SIOCADDRT: 1420 case SIOCDELRT: 1421 rc = -EPERM; 1422 if (!capable(CAP_NET_ADMIN)) 1423 break; 1424 rc = x25_route_ioctl(cmd, argp); 1425 break; 1426 case SIOCX25GSUBSCRIP: 1427 rc = x25_subscr_ioctl(cmd, argp); 1428 break; 1429 case SIOCX25SSUBSCRIP: 1430 rc = -EPERM; 1431 if (!capable(CAP_NET_ADMIN)) 1432 break; 1433 rc = x25_subscr_ioctl(cmd, argp); 1434 break; 1435 case SIOCX25GFACILITIES: { 1436 lock_sock(sk); 1437 rc = copy_to_user(argp, &x25->facilities, 1438 sizeof(x25->facilities)) 1439 ? -EFAULT : 0; 1440 release_sock(sk); 1441 break; 1442 } 1443 1444 case SIOCX25SFACILITIES: { 1445 struct x25_facilities facilities; 1446 rc = -EFAULT; 1447 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1448 break; 1449 rc = -EINVAL; 1450 lock_sock(sk); 1451 if (sk->sk_state != TCP_LISTEN && 1452 sk->sk_state != TCP_CLOSE) 1453 goto out_fac_release; 1454 if (facilities.pacsize_in < X25_PS16 || 1455 facilities.pacsize_in > X25_PS4096) 1456 goto out_fac_release; 1457 if (facilities.pacsize_out < X25_PS16 || 1458 facilities.pacsize_out > X25_PS4096) 1459 goto out_fac_release; 1460 if (facilities.winsize_in < 1 || 1461 facilities.winsize_in > 127) 1462 goto out_fac_release; 1463 if (facilities.throughput) { 1464 int out = facilities.throughput & 0xf0; 1465 int in = facilities.throughput & 0x0f; 1466 if (!out) 1467 facilities.throughput |= 1468 X25_DEFAULT_THROUGHPUT << 4; 1469 else if (out < 0x30 || out > 0xD0) 1470 goto out_fac_release; 1471 if (!in) 1472 facilities.throughput |= 1473 X25_DEFAULT_THROUGHPUT; 1474 else if (in < 0x03 || in > 0x0D) 1475 goto out_fac_release; 1476 } 1477 if (facilities.reverse && 1478 (facilities.reverse & 0x81) != 0x81) 1479 goto out_fac_release; 1480 x25->facilities = facilities; 1481 rc = 0; 1482 out_fac_release: 1483 release_sock(sk); 1484 break; 1485 } 1486 1487 case SIOCX25GDTEFACILITIES: { 1488 lock_sock(sk); 1489 rc = copy_to_user(argp, &x25->dte_facilities, 1490 sizeof(x25->dte_facilities)); 1491 release_sock(sk); 1492 if (rc) 1493 rc = -EFAULT; 1494 break; 1495 } 1496 1497 case SIOCX25SDTEFACILITIES: { 1498 struct x25_dte_facilities dtefacs; 1499 rc = -EFAULT; 1500 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1501 break; 1502 rc = -EINVAL; 1503 lock_sock(sk); 1504 if (sk->sk_state != TCP_LISTEN && 1505 sk->sk_state != TCP_CLOSE) 1506 goto out_dtefac_release; 1507 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1508 goto out_dtefac_release; 1509 if (dtefacs.called_len > X25_MAX_AE_LEN) 1510 goto out_dtefac_release; 1511 x25->dte_facilities = dtefacs; 1512 rc = 0; 1513 out_dtefac_release: 1514 release_sock(sk); 1515 break; 1516 } 1517 1518 case SIOCX25GCALLUSERDATA: { 1519 lock_sock(sk); 1520 rc = copy_to_user(argp, &x25->calluserdata, 1521 sizeof(x25->calluserdata)) 1522 ? -EFAULT : 0; 1523 release_sock(sk); 1524 break; 1525 } 1526 1527 case SIOCX25SCALLUSERDATA: { 1528 struct x25_calluserdata calluserdata; 1529 1530 rc = -EFAULT; 1531 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1532 break; 1533 rc = -EINVAL; 1534 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1535 break; 1536 lock_sock(sk); 1537 x25->calluserdata = calluserdata; 1538 release_sock(sk); 1539 rc = 0; 1540 break; 1541 } 1542 1543 case SIOCX25GCAUSEDIAG: { 1544 lock_sock(sk); 1545 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1546 ? -EFAULT : 0; 1547 release_sock(sk); 1548 break; 1549 } 1550 1551 case SIOCX25SCAUSEDIAG: { 1552 struct x25_causediag causediag; 1553 rc = -EFAULT; 1554 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1555 break; 1556 lock_sock(sk); 1557 x25->causediag = causediag; 1558 release_sock(sk); 1559 rc = 0; 1560 break; 1561 1562 } 1563 1564 case SIOCX25SCUDMATCHLEN: { 1565 struct x25_subaddr sub_addr; 1566 rc = -EINVAL; 1567 lock_sock(sk); 1568 if(sk->sk_state != TCP_CLOSE) 1569 goto out_cud_release; 1570 rc = -EFAULT; 1571 if (copy_from_user(&sub_addr, argp, 1572 sizeof(sub_addr))) 1573 goto out_cud_release; 1574 rc = -EINVAL; 1575 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1576 goto out_cud_release; 1577 x25->cudmatchlength = sub_addr.cudmatchlength; 1578 rc = 0; 1579 out_cud_release: 1580 release_sock(sk); 1581 break; 1582 } 1583 1584 case SIOCX25CALLACCPTAPPRV: { 1585 rc = -EINVAL; 1586 lock_sock(sk); 1587 if (sk->sk_state == TCP_CLOSE) { 1588 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1589 rc = 0; 1590 } 1591 release_sock(sk); 1592 break; 1593 } 1594 1595 case SIOCX25SENDCALLACCPT: { 1596 rc = -EINVAL; 1597 lock_sock(sk); 1598 if (sk->sk_state != TCP_ESTABLISHED) 1599 goto out_sendcallaccpt_release; 1600 /* must call accptapprv above */ 1601 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1602 goto out_sendcallaccpt_release; 1603 x25_write_internal(sk, X25_CALL_ACCEPTED); 1604 x25->state = X25_STATE_3; 1605 rc = 0; 1606 out_sendcallaccpt_release: 1607 release_sock(sk); 1608 break; 1609 } 1610 1611 default: 1612 rc = -ENOIOCTLCMD; 1613 break; 1614 } 1615 1616 return rc; 1617 } 1618 1619 static const struct net_proto_family x25_family_ops = { 1620 .family = AF_X25, 1621 .create = x25_create, 1622 .owner = THIS_MODULE, 1623 }; 1624 1625 #ifdef CONFIG_COMPAT 1626 static int compat_x25_subscr_ioctl(unsigned int cmd, 1627 struct compat_x25_subscrip_struct __user *x25_subscr32) 1628 { 1629 struct compat_x25_subscrip_struct x25_subscr; 1630 struct x25_neigh *nb; 1631 struct net_device *dev; 1632 int rc = -EINVAL; 1633 1634 rc = -EFAULT; 1635 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1636 goto out; 1637 1638 rc = -EINVAL; 1639 dev = x25_dev_get(x25_subscr.device); 1640 if (dev == NULL) 1641 goto out; 1642 1643 nb = x25_get_neigh(dev); 1644 if (nb == NULL) 1645 goto out_dev_put; 1646 1647 dev_put(dev); 1648 1649 if (cmd == SIOCX25GSUBSCRIP) { 1650 read_lock_bh(&x25_neigh_list_lock); 1651 x25_subscr.extended = nb->extended; 1652 x25_subscr.global_facil_mask = nb->global_facil_mask; 1653 read_unlock_bh(&x25_neigh_list_lock); 1654 rc = copy_to_user(x25_subscr32, &x25_subscr, 1655 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1656 } else { 1657 rc = -EINVAL; 1658 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1659 rc = 0; 1660 write_lock_bh(&x25_neigh_list_lock); 1661 nb->extended = x25_subscr.extended; 1662 nb->global_facil_mask = x25_subscr.global_facil_mask; 1663 write_unlock_bh(&x25_neigh_list_lock); 1664 } 1665 } 1666 x25_neigh_put(nb); 1667 out: 1668 return rc; 1669 out_dev_put: 1670 dev_put(dev); 1671 goto out; 1672 } 1673 1674 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1675 unsigned long arg) 1676 { 1677 void __user *argp = compat_ptr(arg); 1678 struct sock *sk = sock->sk; 1679 1680 int rc = -ENOIOCTLCMD; 1681 1682 switch(cmd) { 1683 case TIOCOUTQ: 1684 case TIOCINQ: 1685 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1686 break; 1687 case SIOCGSTAMP: 1688 rc = -EINVAL; 1689 if (sk) 1690 rc = compat_sock_get_timestamp(sk, 1691 (struct timeval __user*)argp); 1692 break; 1693 case SIOCGSTAMPNS: 1694 rc = -EINVAL; 1695 if (sk) 1696 rc = compat_sock_get_timestampns(sk, 1697 (struct timespec __user*)argp); 1698 break; 1699 case SIOCGIFADDR: 1700 case SIOCSIFADDR: 1701 case SIOCGIFDSTADDR: 1702 case SIOCSIFDSTADDR: 1703 case SIOCGIFBRDADDR: 1704 case SIOCSIFBRDADDR: 1705 case SIOCGIFNETMASK: 1706 case SIOCSIFNETMASK: 1707 case SIOCGIFMETRIC: 1708 case SIOCSIFMETRIC: 1709 rc = -EINVAL; 1710 break; 1711 case SIOCADDRT: 1712 case SIOCDELRT: 1713 rc = -EPERM; 1714 if (!capable(CAP_NET_ADMIN)) 1715 break; 1716 rc = x25_route_ioctl(cmd, argp); 1717 break; 1718 case SIOCX25GSUBSCRIP: 1719 rc = compat_x25_subscr_ioctl(cmd, argp); 1720 break; 1721 case SIOCX25SSUBSCRIP: 1722 rc = -EPERM; 1723 if (!capable(CAP_NET_ADMIN)) 1724 break; 1725 rc = compat_x25_subscr_ioctl(cmd, argp); 1726 break; 1727 case SIOCX25GFACILITIES: 1728 case SIOCX25SFACILITIES: 1729 case SIOCX25GDTEFACILITIES: 1730 case SIOCX25SDTEFACILITIES: 1731 case SIOCX25GCALLUSERDATA: 1732 case SIOCX25SCALLUSERDATA: 1733 case SIOCX25GCAUSEDIAG: 1734 case SIOCX25SCAUSEDIAG: 1735 case SIOCX25SCUDMATCHLEN: 1736 case SIOCX25CALLACCPTAPPRV: 1737 case SIOCX25SENDCALLACCPT: 1738 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1739 break; 1740 default: 1741 rc = -ENOIOCTLCMD; 1742 break; 1743 } 1744 return rc; 1745 } 1746 #endif 1747 1748 static const struct proto_ops x25_proto_ops = { 1749 .family = AF_X25, 1750 .owner = THIS_MODULE, 1751 .release = x25_release, 1752 .bind = x25_bind, 1753 .connect = x25_connect, 1754 .socketpair = sock_no_socketpair, 1755 .accept = x25_accept, 1756 .getname = x25_getname, 1757 .poll = datagram_poll, 1758 .ioctl = x25_ioctl, 1759 #ifdef CONFIG_COMPAT 1760 .compat_ioctl = compat_x25_ioctl, 1761 #endif 1762 .listen = x25_listen, 1763 .shutdown = sock_no_shutdown, 1764 .setsockopt = x25_setsockopt, 1765 .getsockopt = x25_getsockopt, 1766 .sendmsg = x25_sendmsg, 1767 .recvmsg = x25_recvmsg, 1768 .mmap = sock_no_mmap, 1769 .sendpage = sock_no_sendpage, 1770 }; 1771 1772 static struct packet_type x25_packet_type __read_mostly = { 1773 .type = cpu_to_be16(ETH_P_X25), 1774 .func = x25_lapb_receive_frame, 1775 }; 1776 1777 static struct notifier_block x25_dev_notifier = { 1778 .notifier_call = x25_device_event, 1779 }; 1780 1781 void x25_kill_by_neigh(struct x25_neigh *nb) 1782 { 1783 struct sock *s; 1784 1785 write_lock_bh(&x25_list_lock); 1786 1787 sk_for_each(s, &x25_list) 1788 if (x25_sk(s)->neighbour == nb) 1789 x25_disconnect(s, ENETUNREACH, 0, 0); 1790 1791 write_unlock_bh(&x25_list_lock); 1792 1793 /* Remove any related forwards */ 1794 x25_clear_forward_by_dev(nb->dev); 1795 } 1796 1797 static int __init x25_init(void) 1798 { 1799 int rc; 1800 1801 rc = proto_register(&x25_proto, 0); 1802 if (rc) 1803 goto out; 1804 1805 rc = sock_register(&x25_family_ops); 1806 if (rc) 1807 goto out_proto; 1808 1809 dev_add_pack(&x25_packet_type); 1810 1811 rc = register_netdevice_notifier(&x25_dev_notifier); 1812 if (rc) 1813 goto out_sock; 1814 1815 rc = x25_register_sysctl(); 1816 if (rc) 1817 goto out_dev; 1818 1819 rc = x25_proc_init(); 1820 if (rc) 1821 goto out_sysctl; 1822 1823 pr_info("Linux Version 0.2\n"); 1824 1825 out: 1826 return rc; 1827 out_sysctl: 1828 x25_unregister_sysctl(); 1829 out_dev: 1830 unregister_netdevice_notifier(&x25_dev_notifier); 1831 out_sock: 1832 dev_remove_pack(&x25_packet_type); 1833 sock_unregister(AF_X25); 1834 out_proto: 1835 proto_unregister(&x25_proto); 1836 goto out; 1837 } 1838 module_init(x25_init); 1839 1840 static void __exit x25_exit(void) 1841 { 1842 x25_proc_exit(); 1843 x25_link_free(); 1844 x25_route_free(); 1845 1846 x25_unregister_sysctl(); 1847 1848 unregister_netdevice_notifier(&x25_dev_notifier); 1849 1850 dev_remove_pack(&x25_packet_type); 1851 1852 sock_unregister(AF_X25); 1853 proto_unregister(&x25_proto); 1854 } 1855 module_exit(x25_exit); 1856 1857 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1858 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1859 MODULE_LICENSE("GPL"); 1860 MODULE_ALIAS_NETPROTO(PF_X25); 1861