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.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 <asm/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 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(unsigned long data) 378 { 379 x25_destroy_socket_from_timer((struct sock *)data); 380 } 381 382 /* 383 * This is called from user mode and the timers. Thus it protects itself 384 * against interrupt users but doesn't worry about being called during 385 * work. Once it is removed from the queue no interrupt or bottom half 386 * will touch it and we are (fairly 8-) ) safe. 387 * Not static as it's used by the timer 388 */ 389 static void __x25_destroy_socket(struct sock *sk) 390 { 391 struct sk_buff *skb; 392 393 x25_stop_heartbeat(sk); 394 x25_stop_timer(sk); 395 396 x25_remove_socket(sk); 397 x25_clear_queues(sk); /* Flush the queues */ 398 399 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 400 if (skb->sk != sk) { /* A pending connection */ 401 /* 402 * Queue the unaccepted socket for death 403 */ 404 skb->sk->sk_state = TCP_LISTEN; 405 sock_set_flag(skb->sk, SOCK_DEAD); 406 x25_start_heartbeat(skb->sk); 407 x25_sk(skb->sk)->state = X25_STATE_0; 408 } 409 410 kfree_skb(skb); 411 } 412 413 if (sk_has_allocations(sk)) { 414 /* Defer: outstanding buffers */ 415 sk->sk_timer.expires = jiffies + 10 * HZ; 416 sk->sk_timer.function = x25_destroy_timer; 417 sk->sk_timer.data = (unsigned long)sk; 418 add_timer(&sk->sk_timer); 419 } else { 420 /* drop last reference so sock_put will free */ 421 __sock_put(sk); 422 } 423 } 424 425 void x25_destroy_socket_from_timer(struct sock *sk) 426 { 427 sock_hold(sk); 428 bh_lock_sock(sk); 429 __x25_destroy_socket(sk); 430 bh_unlock_sock(sk); 431 sock_put(sk); 432 } 433 434 /* 435 * Handling for system calls applied via the various interfaces to a 436 * X.25 socket object. 437 */ 438 439 static int x25_setsockopt(struct socket *sock, int level, int optname, 440 char __user *optval, unsigned int optlen) 441 { 442 int opt; 443 struct sock *sk = sock->sk; 444 int rc = -ENOPROTOOPT; 445 446 if (level != SOL_X25 || optname != X25_QBITINCL) 447 goto out; 448 449 rc = -EINVAL; 450 if (optlen < sizeof(int)) 451 goto out; 452 453 rc = -EFAULT; 454 if (get_user(opt, (int __user *)optval)) 455 goto out; 456 457 if (opt) 458 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 459 else 460 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 461 rc = 0; 462 out: 463 return rc; 464 } 465 466 static int x25_getsockopt(struct socket *sock, int level, int optname, 467 char __user *optval, int __user *optlen) 468 { 469 struct sock *sk = sock->sk; 470 int val, len, rc = -ENOPROTOOPT; 471 472 if (level != SOL_X25 || optname != X25_QBITINCL) 473 goto out; 474 475 rc = -EFAULT; 476 if (get_user(len, optlen)) 477 goto out; 478 479 len = min_t(unsigned int, len, sizeof(int)); 480 481 rc = -EINVAL; 482 if (len < 0) 483 goto out; 484 485 rc = -EFAULT; 486 if (put_user(len, optlen)) 487 goto out; 488 489 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 490 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 491 out: 492 return rc; 493 } 494 495 static int x25_listen(struct socket *sock, int backlog) 496 { 497 struct sock *sk = sock->sk; 498 int rc = -EOPNOTSUPP; 499 500 lock_sock(sk); 501 if (sk->sk_state != TCP_LISTEN) { 502 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 503 sk->sk_max_ack_backlog = backlog; 504 sk->sk_state = TCP_LISTEN; 505 rc = 0; 506 } 507 release_sock(sk); 508 509 return rc; 510 } 511 512 static struct proto x25_proto = { 513 .name = "X25", 514 .owner = THIS_MODULE, 515 .obj_size = sizeof(struct x25_sock), 516 }; 517 518 static struct sock *x25_alloc_socket(struct net *net, int kern) 519 { 520 struct x25_sock *x25; 521 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 522 523 if (!sk) 524 goto out; 525 526 sock_init_data(NULL, sk); 527 528 x25 = x25_sk(sk); 529 skb_queue_head_init(&x25->ack_queue); 530 skb_queue_head_init(&x25->fragment_queue); 531 skb_queue_head_init(&x25->interrupt_in_queue); 532 skb_queue_head_init(&x25->interrupt_out_queue); 533 out: 534 return sk; 535 } 536 537 static int x25_create(struct net *net, struct socket *sock, int protocol, 538 int kern) 539 { 540 struct sock *sk; 541 struct x25_sock *x25; 542 int rc = -EAFNOSUPPORT; 543 544 if (!net_eq(net, &init_net)) 545 goto out; 546 547 rc = -ESOCKTNOSUPPORT; 548 if (sock->type != SOCK_SEQPACKET) 549 goto out; 550 551 rc = -EINVAL; 552 if (protocol) 553 goto out; 554 555 rc = -ENOBUFS; 556 if ((sk = x25_alloc_socket(net, kern)) == NULL) 557 goto out; 558 559 x25 = x25_sk(sk); 560 561 sock_init_data(sock, sk); 562 563 x25_init_timers(sk); 564 565 sock->ops = &x25_proto_ops; 566 sk->sk_protocol = protocol; 567 sk->sk_backlog_rcv = x25_backlog_rcv; 568 569 x25->t21 = sysctl_x25_call_request_timeout; 570 x25->t22 = sysctl_x25_reset_request_timeout; 571 x25->t23 = sysctl_x25_clear_request_timeout; 572 x25->t2 = sysctl_x25_ack_holdback_timeout; 573 x25->state = X25_STATE_0; 574 x25->cudmatchlength = 0; 575 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 576 /* on call accept */ 577 578 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 579 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 580 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 581 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 582 x25->facilities.throughput = 0; /* by default don't negotiate 583 throughput */ 584 x25->facilities.reverse = X25_DEFAULT_REVERSE; 585 x25->dte_facilities.calling_len = 0; 586 x25->dte_facilities.called_len = 0; 587 memset(x25->dte_facilities.called_ae, '\0', 588 sizeof(x25->dte_facilities.called_ae)); 589 memset(x25->dte_facilities.calling_ae, '\0', 590 sizeof(x25->dte_facilities.calling_ae)); 591 592 rc = 0; 593 out: 594 return rc; 595 } 596 597 static struct sock *x25_make_new(struct sock *osk) 598 { 599 struct sock *sk = NULL; 600 struct x25_sock *x25, *ox25; 601 602 if (osk->sk_type != SOCK_SEQPACKET) 603 goto out; 604 605 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 606 goto out; 607 608 x25 = x25_sk(sk); 609 610 sk->sk_type = osk->sk_type; 611 sk->sk_priority = osk->sk_priority; 612 sk->sk_protocol = osk->sk_protocol; 613 sk->sk_rcvbuf = osk->sk_rcvbuf; 614 sk->sk_sndbuf = osk->sk_sndbuf; 615 sk->sk_state = TCP_ESTABLISHED; 616 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 617 sock_copy_flags(sk, osk); 618 619 ox25 = x25_sk(osk); 620 x25->t21 = ox25->t21; 621 x25->t22 = ox25->t22; 622 x25->t23 = ox25->t23; 623 x25->t2 = ox25->t2; 624 x25->flags = ox25->flags; 625 x25->facilities = ox25->facilities; 626 x25->dte_facilities = ox25->dte_facilities; 627 x25->cudmatchlength = ox25->cudmatchlength; 628 629 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 630 x25_init_timers(sk); 631 out: 632 return sk; 633 } 634 635 static int x25_release(struct socket *sock) 636 { 637 struct sock *sk = sock->sk; 638 struct x25_sock *x25; 639 640 if (!sk) 641 return 0; 642 643 x25 = x25_sk(sk); 644 645 sock_hold(sk); 646 lock_sock(sk); 647 switch (x25->state) { 648 649 case X25_STATE_0: 650 case X25_STATE_2: 651 x25_disconnect(sk, 0, 0, 0); 652 __x25_destroy_socket(sk); 653 goto out; 654 655 case X25_STATE_1: 656 case X25_STATE_3: 657 case X25_STATE_4: 658 x25_clear_queues(sk); 659 x25_write_internal(sk, X25_CLEAR_REQUEST); 660 x25_start_t23timer(sk); 661 x25->state = X25_STATE_2; 662 sk->sk_state = TCP_CLOSE; 663 sk->sk_shutdown |= SEND_SHUTDOWN; 664 sk->sk_state_change(sk); 665 sock_set_flag(sk, SOCK_DEAD); 666 sock_set_flag(sk, SOCK_DESTROY); 667 break; 668 } 669 670 sock_orphan(sk); 671 out: 672 release_sock(sk); 673 sock_put(sk); 674 return 0; 675 } 676 677 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 678 { 679 struct sock *sk = sock->sk; 680 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 681 int len, i, rc = 0; 682 683 if (!sock_flag(sk, SOCK_ZAPPED) || 684 addr_len != sizeof(struct sockaddr_x25) || 685 addr->sx25_family != AF_X25) { 686 rc = -EINVAL; 687 goto out; 688 } 689 690 len = strlen(addr->sx25_addr.x25_addr); 691 for (i = 0; i < len; i++) { 692 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 693 rc = -EINVAL; 694 goto out; 695 } 696 } 697 698 lock_sock(sk); 699 x25_sk(sk)->source_addr = addr->sx25_addr; 700 x25_insert_socket(sk); 701 sock_reset_flag(sk, SOCK_ZAPPED); 702 release_sock(sk); 703 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 704 out: 705 return rc; 706 } 707 708 static int x25_wait_for_connection_establishment(struct sock *sk) 709 { 710 DECLARE_WAITQUEUE(wait, current); 711 int rc; 712 713 add_wait_queue_exclusive(sk_sleep(sk), &wait); 714 for (;;) { 715 __set_current_state(TASK_INTERRUPTIBLE); 716 rc = -ERESTARTSYS; 717 if (signal_pending(current)) 718 break; 719 rc = sock_error(sk); 720 if (rc) { 721 sk->sk_socket->state = SS_UNCONNECTED; 722 break; 723 } 724 rc = 0; 725 if (sk->sk_state != TCP_ESTABLISHED) { 726 release_sock(sk); 727 schedule(); 728 lock_sock(sk); 729 } else 730 break; 731 } 732 __set_current_state(TASK_RUNNING); 733 remove_wait_queue(sk_sleep(sk), &wait); 734 return rc; 735 } 736 737 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 738 int addr_len, int flags) 739 { 740 struct sock *sk = sock->sk; 741 struct x25_sock *x25 = x25_sk(sk); 742 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 743 struct x25_route *rt; 744 int rc = 0; 745 746 lock_sock(sk); 747 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 748 sock->state = SS_CONNECTED; 749 goto out; /* Connect completed during a ERESTARTSYS event */ 750 } 751 752 rc = -ECONNREFUSED; 753 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 754 sock->state = SS_UNCONNECTED; 755 goto out; 756 } 757 758 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 759 if (sk->sk_state == TCP_ESTABLISHED) 760 goto out; 761 762 sk->sk_state = TCP_CLOSE; 763 sock->state = SS_UNCONNECTED; 764 765 rc = -EINVAL; 766 if (addr_len != sizeof(struct sockaddr_x25) || 767 addr->sx25_family != AF_X25) 768 goto out; 769 770 rc = -ENETUNREACH; 771 rt = x25_get_route(&addr->sx25_addr); 772 if (!rt) 773 goto out; 774 775 x25->neighbour = x25_get_neigh(rt->dev); 776 if (!x25->neighbour) 777 goto out_put_route; 778 779 x25_limit_facilities(&x25->facilities, x25->neighbour); 780 781 x25->lci = x25_new_lci(x25->neighbour); 782 if (!x25->lci) 783 goto out_put_neigh; 784 785 rc = -EINVAL; 786 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 787 goto out_put_neigh; 788 789 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 790 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 791 792 x25->dest_addr = addr->sx25_addr; 793 794 /* Move to connecting socket, start sending Connect Requests */ 795 sock->state = SS_CONNECTING; 796 sk->sk_state = TCP_SYN_SENT; 797 798 x25->state = X25_STATE_1; 799 800 x25_write_internal(sk, X25_CALL_REQUEST); 801 802 x25_start_heartbeat(sk); 803 x25_start_t21timer(sk); 804 805 /* Now the loop */ 806 rc = -EINPROGRESS; 807 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 808 goto out_put_neigh; 809 810 rc = x25_wait_for_connection_establishment(sk); 811 if (rc) 812 goto out_put_neigh; 813 814 sock->state = SS_CONNECTED; 815 rc = 0; 816 out_put_neigh: 817 if (rc) 818 x25_neigh_put(x25->neighbour); 819 out_put_route: 820 x25_route_put(rt); 821 out: 822 release_sock(sk); 823 return rc; 824 } 825 826 static int x25_wait_for_data(struct sock *sk, long timeout) 827 { 828 DECLARE_WAITQUEUE(wait, current); 829 int rc = 0; 830 831 add_wait_queue_exclusive(sk_sleep(sk), &wait); 832 for (;;) { 833 __set_current_state(TASK_INTERRUPTIBLE); 834 if (sk->sk_shutdown & RCV_SHUTDOWN) 835 break; 836 rc = -ERESTARTSYS; 837 if (signal_pending(current)) 838 break; 839 rc = -EAGAIN; 840 if (!timeout) 841 break; 842 rc = 0; 843 if (skb_queue_empty(&sk->sk_receive_queue)) { 844 release_sock(sk); 845 timeout = schedule_timeout(timeout); 846 lock_sock(sk); 847 } else 848 break; 849 } 850 __set_current_state(TASK_RUNNING); 851 remove_wait_queue(sk_sleep(sk), &wait); 852 return rc; 853 } 854 855 static int x25_accept(struct socket *sock, struct socket *newsock, int flags) 856 { 857 struct sock *sk = sock->sk; 858 struct sock *newsk; 859 struct sk_buff *skb; 860 int rc = -EINVAL; 861 862 if (!sk) 863 goto out; 864 865 rc = -EOPNOTSUPP; 866 if (sk->sk_type != SOCK_SEQPACKET) 867 goto out; 868 869 lock_sock(sk); 870 rc = -EINVAL; 871 if (sk->sk_state != TCP_LISTEN) 872 goto out2; 873 874 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 875 if (rc) 876 goto out2; 877 skb = skb_dequeue(&sk->sk_receive_queue); 878 rc = -EINVAL; 879 if (!skb->sk) 880 goto out2; 881 newsk = skb->sk; 882 sock_graft(newsk, newsock); 883 884 /* Now attach up the new socket */ 885 skb->sk = NULL; 886 kfree_skb(skb); 887 sk->sk_ack_backlog--; 888 newsock->state = SS_CONNECTED; 889 rc = 0; 890 out2: 891 release_sock(sk); 892 out: 893 return rc; 894 } 895 896 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 897 int *uaddr_len, int peer) 898 { 899 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 900 struct sock *sk = sock->sk; 901 struct x25_sock *x25 = x25_sk(sk); 902 int rc = 0; 903 904 if (peer) { 905 if (sk->sk_state != TCP_ESTABLISHED) { 906 rc = -ENOTCONN; 907 goto out; 908 } 909 sx25->sx25_addr = x25->dest_addr; 910 } else 911 sx25->sx25_addr = x25->source_addr; 912 913 sx25->sx25_family = AF_X25; 914 *uaddr_len = sizeof(*sx25); 915 916 out: 917 return rc; 918 } 919 920 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 921 unsigned int lci) 922 { 923 struct sock *sk; 924 struct sock *make; 925 struct x25_sock *makex25; 926 struct x25_address source_addr, dest_addr; 927 struct x25_facilities facilities; 928 struct x25_dte_facilities dte_facilities; 929 int len, addr_len, rc; 930 931 /* 932 * Remove the LCI and frame type. 933 */ 934 skb_pull(skb, X25_STD_MIN_LEN); 935 936 /* 937 * Extract the X.25 addresses and convert them to ASCII strings, 938 * and remove them. 939 * 940 * Address block is mandatory in call request packets 941 */ 942 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 943 if (addr_len <= 0) 944 goto out_clear_request; 945 skb_pull(skb, addr_len); 946 947 /* 948 * Get the length of the facilities, skip past them for the moment 949 * get the call user data because this is needed to determine 950 * the correct listener 951 * 952 * Facilities length is mandatory in call request packets 953 */ 954 if (!pskb_may_pull(skb, 1)) 955 goto out_clear_request; 956 len = skb->data[0] + 1; 957 if (!pskb_may_pull(skb, len)) 958 goto out_clear_request; 959 skb_pull(skb,len); 960 961 /* 962 * Ensure that the amount of call user data is valid. 963 */ 964 if (skb->len > X25_MAX_CUD_LEN) 965 goto out_clear_request; 966 967 /* 968 * Get all the call user data so it can be used in 969 * x25_find_listener and skb_copy_from_linear_data up ahead. 970 */ 971 if (!pskb_may_pull(skb, skb->len)) 972 goto out_clear_request; 973 974 /* 975 * Find a listener for the particular address/cud pair. 976 */ 977 sk = x25_find_listener(&source_addr,skb); 978 skb_push(skb,len); 979 980 if (sk != NULL && sk_acceptq_is_full(sk)) { 981 goto out_sock_put; 982 } 983 984 /* 985 * We dont have any listeners for this incoming call. 986 * Try forwarding it. 987 */ 988 if (sk == NULL) { 989 skb_push(skb, addr_len + X25_STD_MIN_LEN); 990 if (sysctl_x25_forward && 991 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 992 { 993 /* Call was forwarded, dont process it any more */ 994 kfree_skb(skb); 995 rc = 1; 996 goto out; 997 } else { 998 /* No listeners, can't forward, clear the call */ 999 goto out_clear_request; 1000 } 1001 } 1002 1003 /* 1004 * Try to reach a compromise on the requested facilities. 1005 */ 1006 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1007 if (len == -1) 1008 goto out_sock_put; 1009 1010 /* 1011 * current neighbour/link might impose additional limits 1012 * on certain facilties 1013 */ 1014 1015 x25_limit_facilities(&facilities, nb); 1016 1017 /* 1018 * Try to create a new socket. 1019 */ 1020 make = x25_make_new(sk); 1021 if (!make) 1022 goto out_sock_put; 1023 1024 /* 1025 * Remove the facilities 1026 */ 1027 skb_pull(skb, len); 1028 1029 skb->sk = make; 1030 make->sk_state = TCP_ESTABLISHED; 1031 1032 makex25 = x25_sk(make); 1033 makex25->lci = lci; 1034 makex25->dest_addr = dest_addr; 1035 makex25->source_addr = source_addr; 1036 makex25->neighbour = nb; 1037 makex25->facilities = facilities; 1038 makex25->dte_facilities= dte_facilities; 1039 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1040 /* ensure no reverse facil on accept */ 1041 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1042 /* ensure no calling address extension on accept */ 1043 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1044 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1045 1046 /* Normally all calls are accepted immediately */ 1047 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1048 x25_write_internal(make, X25_CALL_ACCEPTED); 1049 makex25->state = X25_STATE_3; 1050 } 1051 1052 /* 1053 * Incoming Call User Data. 1054 */ 1055 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1056 makex25->calluserdata.cudlength = skb->len; 1057 1058 sk->sk_ack_backlog++; 1059 1060 x25_insert_socket(make); 1061 1062 skb_queue_head(&sk->sk_receive_queue, skb); 1063 1064 x25_start_heartbeat(make); 1065 1066 if (!sock_flag(sk, SOCK_DEAD)) 1067 sk->sk_data_ready(sk); 1068 rc = 1; 1069 sock_put(sk); 1070 out: 1071 return rc; 1072 out_sock_put: 1073 sock_put(sk); 1074 out_clear_request: 1075 rc = 0; 1076 x25_transmit_clear_request(nb, lci, 0x01); 1077 goto out; 1078 } 1079 1080 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1081 { 1082 struct sock *sk = sock->sk; 1083 struct x25_sock *x25 = x25_sk(sk); 1084 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1085 struct sockaddr_x25 sx25; 1086 struct sk_buff *skb; 1087 unsigned char *asmptr; 1088 int noblock = msg->msg_flags & MSG_DONTWAIT; 1089 size_t size; 1090 int qbit = 0, rc = -EINVAL; 1091 1092 lock_sock(sk); 1093 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1094 goto out; 1095 1096 /* we currently don't support segmented records at the user interface */ 1097 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1098 goto out; 1099 1100 rc = -EADDRNOTAVAIL; 1101 if (sock_flag(sk, SOCK_ZAPPED)) 1102 goto out; 1103 1104 rc = -EPIPE; 1105 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1106 send_sig(SIGPIPE, current, 0); 1107 goto out; 1108 } 1109 1110 rc = -ENETUNREACH; 1111 if (!x25->neighbour) 1112 goto out; 1113 1114 if (usx25) { 1115 rc = -EINVAL; 1116 if (msg->msg_namelen < sizeof(sx25)) 1117 goto out; 1118 memcpy(&sx25, usx25, sizeof(sx25)); 1119 rc = -EISCONN; 1120 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1121 goto out; 1122 rc = -EINVAL; 1123 if (sx25.sx25_family != AF_X25) 1124 goto out; 1125 } else { 1126 /* 1127 * FIXME 1003.1g - if the socket is like this because 1128 * it has become closed (not started closed) we ought 1129 * to SIGPIPE, EPIPE; 1130 */ 1131 rc = -ENOTCONN; 1132 if (sk->sk_state != TCP_ESTABLISHED) 1133 goto out; 1134 1135 sx25.sx25_family = AF_X25; 1136 sx25.sx25_addr = x25->dest_addr; 1137 } 1138 1139 /* Sanity check the packet size */ 1140 if (len > 65535) { 1141 rc = -EMSGSIZE; 1142 goto out; 1143 } 1144 1145 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1146 1147 /* Build a packet */ 1148 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1149 1150 if ((msg->msg_flags & MSG_OOB) && len > 32) 1151 len = 32; 1152 1153 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1154 1155 release_sock(sk); 1156 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1157 lock_sock(sk); 1158 if (!skb) 1159 goto out; 1160 X25_SKB_CB(skb)->flags = msg->msg_flags; 1161 1162 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1163 1164 /* 1165 * Put the data on the end 1166 */ 1167 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1168 1169 skb_reset_transport_header(skb); 1170 skb_put(skb, len); 1171 1172 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1173 if (rc) 1174 goto out_kfree_skb; 1175 1176 /* 1177 * If the Q BIT Include socket option is in force, the first 1178 * byte of the user data is the logical value of the Q Bit. 1179 */ 1180 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1181 if (!pskb_may_pull(skb, 1)) 1182 goto out_kfree_skb; 1183 1184 qbit = skb->data[0]; 1185 skb_pull(skb, 1); 1186 } 1187 1188 /* 1189 * Push down the X.25 header 1190 */ 1191 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1192 1193 if (msg->msg_flags & MSG_OOB) { 1194 if (x25->neighbour->extended) { 1195 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1196 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1197 *asmptr++ = (x25->lci >> 0) & 0xFF; 1198 *asmptr++ = X25_INTERRUPT; 1199 } else { 1200 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1201 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1202 *asmptr++ = (x25->lci >> 0) & 0xFF; 1203 *asmptr++ = X25_INTERRUPT; 1204 } 1205 } else { 1206 if (x25->neighbour->extended) { 1207 /* Build an Extended X.25 header */ 1208 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1209 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1210 *asmptr++ = (x25->lci >> 0) & 0xFF; 1211 *asmptr++ = X25_DATA; 1212 *asmptr++ = X25_DATA; 1213 } else { 1214 /* Build an Standard X.25 header */ 1215 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1216 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1217 *asmptr++ = (x25->lci >> 0) & 0xFF; 1218 *asmptr++ = X25_DATA; 1219 } 1220 1221 if (qbit) 1222 skb->data[0] |= X25_Q_BIT; 1223 } 1224 1225 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1226 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1227 1228 rc = -ENOTCONN; 1229 if (sk->sk_state != TCP_ESTABLISHED) 1230 goto out_kfree_skb; 1231 1232 if (msg->msg_flags & MSG_OOB) 1233 skb_queue_tail(&x25->interrupt_out_queue, skb); 1234 else { 1235 rc = x25_output(sk, skb); 1236 len = rc; 1237 if (rc < 0) 1238 kfree_skb(skb); 1239 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1240 len++; 1241 } 1242 1243 x25_kick(sk); 1244 rc = len; 1245 out: 1246 release_sock(sk); 1247 return rc; 1248 out_kfree_skb: 1249 kfree_skb(skb); 1250 goto out; 1251 } 1252 1253 1254 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1255 int flags) 1256 { 1257 struct sock *sk = sock->sk; 1258 struct x25_sock *x25 = x25_sk(sk); 1259 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1260 size_t copied; 1261 int qbit, header_len; 1262 struct sk_buff *skb; 1263 unsigned char *asmptr; 1264 int rc = -ENOTCONN; 1265 1266 lock_sock(sk); 1267 1268 if (x25->neighbour == NULL) 1269 goto out; 1270 1271 header_len = x25->neighbour->extended ? 1272 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1273 1274 /* 1275 * This works for seqpacket too. The receiver has ordered the queue for 1276 * us! We do one quick check first though 1277 */ 1278 if (sk->sk_state != TCP_ESTABLISHED) 1279 goto out; 1280 1281 if (flags & MSG_OOB) { 1282 rc = -EINVAL; 1283 if (sock_flag(sk, SOCK_URGINLINE) || 1284 !skb_peek(&x25->interrupt_in_queue)) 1285 goto out; 1286 1287 skb = skb_dequeue(&x25->interrupt_in_queue); 1288 1289 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1290 goto out_free_dgram; 1291 1292 skb_pull(skb, X25_STD_MIN_LEN); 1293 1294 /* 1295 * No Q bit information on Interrupt data. 1296 */ 1297 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1298 asmptr = skb_push(skb, 1); 1299 *asmptr = 0x00; 1300 } 1301 1302 msg->msg_flags |= MSG_OOB; 1303 } else { 1304 /* Now we can treat all alike */ 1305 release_sock(sk); 1306 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1307 flags & MSG_DONTWAIT, &rc); 1308 lock_sock(sk); 1309 if (!skb) 1310 goto out; 1311 1312 if (!pskb_may_pull(skb, header_len)) 1313 goto out_free_dgram; 1314 1315 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1316 1317 skb_pull(skb, header_len); 1318 1319 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1320 asmptr = skb_push(skb, 1); 1321 *asmptr = qbit; 1322 } 1323 } 1324 1325 skb_reset_transport_header(skb); 1326 copied = skb->len; 1327 1328 if (copied > size) { 1329 copied = size; 1330 msg->msg_flags |= MSG_TRUNC; 1331 } 1332 1333 /* Currently, each datagram always contains a complete record */ 1334 msg->msg_flags |= MSG_EOR; 1335 1336 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1337 if (rc) 1338 goto out_free_dgram; 1339 1340 if (sx25) { 1341 sx25->sx25_family = AF_X25; 1342 sx25->sx25_addr = x25->dest_addr; 1343 msg->msg_namelen = sizeof(*sx25); 1344 } 1345 1346 x25_check_rbuf(sk); 1347 rc = copied; 1348 out_free_dgram: 1349 skb_free_datagram(sk, skb); 1350 out: 1351 release_sock(sk); 1352 return rc; 1353 } 1354 1355 1356 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1357 { 1358 struct sock *sk = sock->sk; 1359 struct x25_sock *x25 = x25_sk(sk); 1360 void __user *argp = (void __user *)arg; 1361 int rc; 1362 1363 switch (cmd) { 1364 case TIOCOUTQ: { 1365 int amount; 1366 1367 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1368 if (amount < 0) 1369 amount = 0; 1370 rc = put_user(amount, (unsigned int __user *)argp); 1371 break; 1372 } 1373 1374 case TIOCINQ: { 1375 struct sk_buff *skb; 1376 int amount = 0; 1377 /* 1378 * These two are safe on a single CPU system as 1379 * only user tasks fiddle here 1380 */ 1381 lock_sock(sk); 1382 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1383 amount = skb->len; 1384 release_sock(sk); 1385 rc = put_user(amount, (unsigned int __user *)argp); 1386 break; 1387 } 1388 1389 case SIOCGSTAMP: 1390 rc = -EINVAL; 1391 if (sk) 1392 rc = sock_get_timestamp(sk, 1393 (struct timeval __user *)argp); 1394 break; 1395 case SIOCGSTAMPNS: 1396 rc = -EINVAL; 1397 if (sk) 1398 rc = sock_get_timestampns(sk, 1399 (struct timespec __user *)argp); 1400 break; 1401 case SIOCGIFADDR: 1402 case SIOCSIFADDR: 1403 case SIOCGIFDSTADDR: 1404 case SIOCSIFDSTADDR: 1405 case SIOCGIFBRDADDR: 1406 case SIOCSIFBRDADDR: 1407 case SIOCGIFNETMASK: 1408 case SIOCSIFNETMASK: 1409 case SIOCGIFMETRIC: 1410 case SIOCSIFMETRIC: 1411 rc = -EINVAL; 1412 break; 1413 case SIOCADDRT: 1414 case SIOCDELRT: 1415 rc = -EPERM; 1416 if (!capable(CAP_NET_ADMIN)) 1417 break; 1418 rc = x25_route_ioctl(cmd, argp); 1419 break; 1420 case SIOCX25GSUBSCRIP: 1421 rc = x25_subscr_ioctl(cmd, argp); 1422 break; 1423 case SIOCX25SSUBSCRIP: 1424 rc = -EPERM; 1425 if (!capable(CAP_NET_ADMIN)) 1426 break; 1427 rc = x25_subscr_ioctl(cmd, argp); 1428 break; 1429 case SIOCX25GFACILITIES: { 1430 lock_sock(sk); 1431 rc = copy_to_user(argp, &x25->facilities, 1432 sizeof(x25->facilities)) 1433 ? -EFAULT : 0; 1434 release_sock(sk); 1435 break; 1436 } 1437 1438 case SIOCX25SFACILITIES: { 1439 struct x25_facilities facilities; 1440 rc = -EFAULT; 1441 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1442 break; 1443 rc = -EINVAL; 1444 lock_sock(sk); 1445 if (sk->sk_state != TCP_LISTEN && 1446 sk->sk_state != TCP_CLOSE) 1447 goto out_fac_release; 1448 if (facilities.pacsize_in < X25_PS16 || 1449 facilities.pacsize_in > X25_PS4096) 1450 goto out_fac_release; 1451 if (facilities.pacsize_out < X25_PS16 || 1452 facilities.pacsize_out > X25_PS4096) 1453 goto out_fac_release; 1454 if (facilities.winsize_in < 1 || 1455 facilities.winsize_in > 127) 1456 goto out_fac_release; 1457 if (facilities.throughput) { 1458 int out = facilities.throughput & 0xf0; 1459 int in = facilities.throughput & 0x0f; 1460 if (!out) 1461 facilities.throughput |= 1462 X25_DEFAULT_THROUGHPUT << 4; 1463 else if (out < 0x30 || out > 0xD0) 1464 goto out_fac_release; 1465 if (!in) 1466 facilities.throughput |= 1467 X25_DEFAULT_THROUGHPUT; 1468 else if (in < 0x03 || in > 0x0D) 1469 goto out_fac_release; 1470 } 1471 if (facilities.reverse && 1472 (facilities.reverse & 0x81) != 0x81) 1473 goto out_fac_release; 1474 x25->facilities = facilities; 1475 rc = 0; 1476 out_fac_release: 1477 release_sock(sk); 1478 break; 1479 } 1480 1481 case SIOCX25GDTEFACILITIES: { 1482 lock_sock(sk); 1483 rc = copy_to_user(argp, &x25->dte_facilities, 1484 sizeof(x25->dte_facilities)); 1485 release_sock(sk); 1486 if (rc) 1487 rc = -EFAULT; 1488 break; 1489 } 1490 1491 case SIOCX25SDTEFACILITIES: { 1492 struct x25_dte_facilities dtefacs; 1493 rc = -EFAULT; 1494 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1495 break; 1496 rc = -EINVAL; 1497 lock_sock(sk); 1498 if (sk->sk_state != TCP_LISTEN && 1499 sk->sk_state != TCP_CLOSE) 1500 goto out_dtefac_release; 1501 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1502 goto out_dtefac_release; 1503 if (dtefacs.calling_ae == NULL) 1504 goto out_dtefac_release; 1505 if (dtefacs.called_len > X25_MAX_AE_LEN) 1506 goto out_dtefac_release; 1507 if (dtefacs.called_ae == NULL) 1508 goto out_dtefac_release; 1509 x25->dte_facilities = dtefacs; 1510 rc = 0; 1511 out_dtefac_release: 1512 release_sock(sk); 1513 break; 1514 } 1515 1516 case SIOCX25GCALLUSERDATA: { 1517 lock_sock(sk); 1518 rc = copy_to_user(argp, &x25->calluserdata, 1519 sizeof(x25->calluserdata)) 1520 ? -EFAULT : 0; 1521 release_sock(sk); 1522 break; 1523 } 1524 1525 case SIOCX25SCALLUSERDATA: { 1526 struct x25_calluserdata calluserdata; 1527 1528 rc = -EFAULT; 1529 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1530 break; 1531 rc = -EINVAL; 1532 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1533 break; 1534 lock_sock(sk); 1535 x25->calluserdata = calluserdata; 1536 release_sock(sk); 1537 rc = 0; 1538 break; 1539 } 1540 1541 case SIOCX25GCAUSEDIAG: { 1542 lock_sock(sk); 1543 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1544 ? -EFAULT : 0; 1545 release_sock(sk); 1546 break; 1547 } 1548 1549 case SIOCX25SCAUSEDIAG: { 1550 struct x25_causediag causediag; 1551 rc = -EFAULT; 1552 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1553 break; 1554 lock_sock(sk); 1555 x25->causediag = causediag; 1556 release_sock(sk); 1557 rc = 0; 1558 break; 1559 1560 } 1561 1562 case SIOCX25SCUDMATCHLEN: { 1563 struct x25_subaddr sub_addr; 1564 rc = -EINVAL; 1565 lock_sock(sk); 1566 if(sk->sk_state != TCP_CLOSE) 1567 goto out_cud_release; 1568 rc = -EFAULT; 1569 if (copy_from_user(&sub_addr, argp, 1570 sizeof(sub_addr))) 1571 goto out_cud_release; 1572 rc = -EINVAL; 1573 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1574 goto out_cud_release; 1575 x25->cudmatchlength = sub_addr.cudmatchlength; 1576 rc = 0; 1577 out_cud_release: 1578 release_sock(sk); 1579 break; 1580 } 1581 1582 case SIOCX25CALLACCPTAPPRV: { 1583 rc = -EINVAL; 1584 lock_sock(sk); 1585 if (sk->sk_state == TCP_CLOSE) { 1586 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1587 rc = 0; 1588 } 1589 release_sock(sk); 1590 break; 1591 } 1592 1593 case SIOCX25SENDCALLACCPT: { 1594 rc = -EINVAL; 1595 lock_sock(sk); 1596 if (sk->sk_state != TCP_ESTABLISHED) 1597 goto out_sendcallaccpt_release; 1598 /* must call accptapprv above */ 1599 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1600 goto out_sendcallaccpt_release; 1601 x25_write_internal(sk, X25_CALL_ACCEPTED); 1602 x25->state = X25_STATE_3; 1603 rc = 0; 1604 out_sendcallaccpt_release: 1605 release_sock(sk); 1606 break; 1607 } 1608 1609 default: 1610 rc = -ENOIOCTLCMD; 1611 break; 1612 } 1613 1614 return rc; 1615 } 1616 1617 static const struct net_proto_family x25_family_ops = { 1618 .family = AF_X25, 1619 .create = x25_create, 1620 .owner = THIS_MODULE, 1621 }; 1622 1623 #ifdef CONFIG_COMPAT 1624 static int compat_x25_subscr_ioctl(unsigned int cmd, 1625 struct compat_x25_subscrip_struct __user *x25_subscr32) 1626 { 1627 struct compat_x25_subscrip_struct x25_subscr; 1628 struct x25_neigh *nb; 1629 struct net_device *dev; 1630 int rc = -EINVAL; 1631 1632 rc = -EFAULT; 1633 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1634 goto out; 1635 1636 rc = -EINVAL; 1637 dev = x25_dev_get(x25_subscr.device); 1638 if (dev == NULL) 1639 goto out; 1640 1641 nb = x25_get_neigh(dev); 1642 if (nb == NULL) 1643 goto out_dev_put; 1644 1645 dev_put(dev); 1646 1647 if (cmd == SIOCX25GSUBSCRIP) { 1648 read_lock_bh(&x25_neigh_list_lock); 1649 x25_subscr.extended = nb->extended; 1650 x25_subscr.global_facil_mask = nb->global_facil_mask; 1651 read_unlock_bh(&x25_neigh_list_lock); 1652 rc = copy_to_user(x25_subscr32, &x25_subscr, 1653 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1654 } else { 1655 rc = -EINVAL; 1656 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1657 rc = 0; 1658 write_lock_bh(&x25_neigh_list_lock); 1659 nb->extended = x25_subscr.extended; 1660 nb->global_facil_mask = x25_subscr.global_facil_mask; 1661 write_unlock_bh(&x25_neigh_list_lock); 1662 } 1663 } 1664 x25_neigh_put(nb); 1665 out: 1666 return rc; 1667 out_dev_put: 1668 dev_put(dev); 1669 goto out; 1670 } 1671 1672 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1673 unsigned long arg) 1674 { 1675 void __user *argp = compat_ptr(arg); 1676 struct sock *sk = sock->sk; 1677 1678 int rc = -ENOIOCTLCMD; 1679 1680 switch(cmd) { 1681 case TIOCOUTQ: 1682 case TIOCINQ: 1683 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1684 break; 1685 case SIOCGSTAMP: 1686 rc = -EINVAL; 1687 if (sk) 1688 rc = compat_sock_get_timestamp(sk, 1689 (struct timeval __user*)argp); 1690 break; 1691 case SIOCGSTAMPNS: 1692 rc = -EINVAL; 1693 if (sk) 1694 rc = compat_sock_get_timestampns(sk, 1695 (struct timespec __user*)argp); 1696 break; 1697 case SIOCGIFADDR: 1698 case SIOCSIFADDR: 1699 case SIOCGIFDSTADDR: 1700 case SIOCSIFDSTADDR: 1701 case SIOCGIFBRDADDR: 1702 case SIOCSIFBRDADDR: 1703 case SIOCGIFNETMASK: 1704 case SIOCSIFNETMASK: 1705 case SIOCGIFMETRIC: 1706 case SIOCSIFMETRIC: 1707 rc = -EINVAL; 1708 break; 1709 case SIOCADDRT: 1710 case SIOCDELRT: 1711 rc = -EPERM; 1712 if (!capable(CAP_NET_ADMIN)) 1713 break; 1714 rc = x25_route_ioctl(cmd, argp); 1715 break; 1716 case SIOCX25GSUBSCRIP: 1717 rc = compat_x25_subscr_ioctl(cmd, argp); 1718 break; 1719 case SIOCX25SSUBSCRIP: 1720 rc = -EPERM; 1721 if (!capable(CAP_NET_ADMIN)) 1722 break; 1723 rc = compat_x25_subscr_ioctl(cmd, argp); 1724 break; 1725 case SIOCX25GFACILITIES: 1726 case SIOCX25SFACILITIES: 1727 case SIOCX25GDTEFACILITIES: 1728 case SIOCX25SDTEFACILITIES: 1729 case SIOCX25GCALLUSERDATA: 1730 case SIOCX25SCALLUSERDATA: 1731 case SIOCX25GCAUSEDIAG: 1732 case SIOCX25SCAUSEDIAG: 1733 case SIOCX25SCUDMATCHLEN: 1734 case SIOCX25CALLACCPTAPPRV: 1735 case SIOCX25SENDCALLACCPT: 1736 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1737 break; 1738 default: 1739 rc = -ENOIOCTLCMD; 1740 break; 1741 } 1742 return rc; 1743 } 1744 #endif 1745 1746 static const struct proto_ops x25_proto_ops = { 1747 .family = AF_X25, 1748 .owner = THIS_MODULE, 1749 .release = x25_release, 1750 .bind = x25_bind, 1751 .connect = x25_connect, 1752 .socketpair = sock_no_socketpair, 1753 .accept = x25_accept, 1754 .getname = x25_getname, 1755 .poll = datagram_poll, 1756 .ioctl = x25_ioctl, 1757 #ifdef CONFIG_COMPAT 1758 .compat_ioctl = compat_x25_ioctl, 1759 #endif 1760 .listen = x25_listen, 1761 .shutdown = sock_no_shutdown, 1762 .setsockopt = x25_setsockopt, 1763 .getsockopt = x25_getsockopt, 1764 .sendmsg = x25_sendmsg, 1765 .recvmsg = x25_recvmsg, 1766 .mmap = sock_no_mmap, 1767 .sendpage = sock_no_sendpage, 1768 }; 1769 1770 static struct packet_type x25_packet_type __read_mostly = { 1771 .type = cpu_to_be16(ETH_P_X25), 1772 .func = x25_lapb_receive_frame, 1773 }; 1774 1775 static struct notifier_block x25_dev_notifier = { 1776 .notifier_call = x25_device_event, 1777 }; 1778 1779 void x25_kill_by_neigh(struct x25_neigh *nb) 1780 { 1781 struct sock *s; 1782 1783 write_lock_bh(&x25_list_lock); 1784 1785 sk_for_each(s, &x25_list) 1786 if (x25_sk(s)->neighbour == nb) 1787 x25_disconnect(s, ENETUNREACH, 0, 0); 1788 1789 write_unlock_bh(&x25_list_lock); 1790 1791 /* Remove any related forwards */ 1792 x25_clear_forward_by_dev(nb->dev); 1793 } 1794 1795 static int __init x25_init(void) 1796 { 1797 int rc = proto_register(&x25_proto, 0); 1798 1799 if (rc != 0) 1800 goto out; 1801 1802 rc = sock_register(&x25_family_ops); 1803 if (rc != 0) 1804 goto out_proto; 1805 1806 dev_add_pack(&x25_packet_type); 1807 1808 rc = register_netdevice_notifier(&x25_dev_notifier); 1809 if (rc != 0) 1810 goto out_sock; 1811 1812 pr_info("Linux Version 0.2\n"); 1813 1814 x25_register_sysctl(); 1815 rc = x25_proc_init(); 1816 if (rc != 0) 1817 goto out_dev; 1818 out: 1819 return rc; 1820 out_dev: 1821 unregister_netdevice_notifier(&x25_dev_notifier); 1822 out_sock: 1823 sock_unregister(AF_X25); 1824 out_proto: 1825 proto_unregister(&x25_proto); 1826 goto out; 1827 } 1828 module_init(x25_init); 1829 1830 static void __exit x25_exit(void) 1831 { 1832 x25_proc_exit(); 1833 x25_link_free(); 1834 x25_route_free(); 1835 1836 x25_unregister_sysctl(); 1837 1838 unregister_netdevice_notifier(&x25_dev_notifier); 1839 1840 dev_remove_pack(&x25_packet_type); 1841 1842 sock_unregister(AF_X25); 1843 proto_unregister(&x25_proto); 1844 } 1845 module_exit(x25_exit); 1846 1847 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1848 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1849 MODULE_LICENSE("GPL"); 1850 MODULE_ALIAS_NETPROTO(PF_X25); 1851