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