1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * X.25 Packet Layer release 002 4 * 5 * This is ALPHA test software. This code may break your machine, 6 * randomly fail to work with new releases, misbehave and/or generally 7 * screw up. It might even work. 8 * 9 * This code REQUIRES 2.1.15 or higher 10 * 11 * History 12 * X.25 001 Jonathan Naylor Started coding. 13 * X.25 002 Jonathan Naylor Centralised disconnect handling. 14 * New timer architecture. 15 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. 16 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of 17 * facilities negotiation and increased 18 * the throughput upper limit. 19 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups 20 * 2000-09-04 Henner Eisen Set sock->state in x25_accept(). 21 * Fixed x25_output() related skb leakage. 22 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. 23 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. 24 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN 25 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to 26 * x25_proc.c, using seq_file 27 * 2005-04-02 Shaun Pereira Selective sub address matching 28 * with call user data 29 * 2005-04-15 Shaun Pereira Fast select with no restriction on 30 * response 31 */ 32 33 #define pr_fmt(fmt) "X25: " fmt 34 35 #include <linux/module.h> 36 #include <linux/capability.h> 37 #include <linux/errno.h> 38 #include <linux/kernel.h> 39 #include <linux/sched/signal.h> 40 #include <linux/timer.h> 41 #include <linux/string.h> 42 #include <linux/net.h> 43 #include <linux/netdevice.h> 44 #include <linux/if_arp.h> 45 #include <linux/skbuff.h> 46 #include <linux/slab.h> 47 #include <net/sock.h> 48 #include <net/tcp_states.h> 49 #include <linux/uaccess.h> 50 #include <linux/fcntl.h> 51 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 52 #include <linux/notifier.h> 53 #include <linux/init.h> 54 #include <linux/compat.h> 55 #include <linux/ctype.h> 56 57 #include <net/x25.h> 58 #include <net/compat.h> 59 60 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 61 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 62 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 63 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 64 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 65 int sysctl_x25_forward = 0; 66 67 HLIST_HEAD(x25_list); 68 DEFINE_RWLOCK(x25_list_lock); 69 70 static const struct proto_ops x25_proto_ops; 71 72 static const struct x25_address null_x25_address = {" "}; 73 74 #ifdef CONFIG_COMPAT 75 struct compat_x25_subscrip_struct { 76 char device[200-sizeof(compat_ulong_t)]; 77 compat_ulong_t global_facil_mask; 78 compat_uint_t extended; 79 }; 80 #endif 81 82 83 int x25_parse_address_block(struct sk_buff *skb, 84 struct x25_address *called_addr, 85 struct x25_address *calling_addr) 86 { 87 unsigned char len; 88 int needed; 89 int rc; 90 91 if (!pskb_may_pull(skb, 1)) { 92 /* packet has no address block */ 93 rc = 0; 94 goto empty; 95 } 96 97 len = *skb->data; 98 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2; 99 100 if (!pskb_may_pull(skb, needed)) { 101 /* packet is too short to hold the addresses it claims 102 to hold */ 103 rc = -1; 104 goto empty; 105 } 106 107 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 108 109 empty: 110 *called_addr->x25_addr = 0; 111 *calling_addr->x25_addr = 0; 112 113 return rc; 114 } 115 116 117 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 118 struct x25_address *calling_addr) 119 { 120 unsigned int called_len, calling_len; 121 char *called, *calling; 122 unsigned int i; 123 124 called_len = (*p >> 0) & 0x0F; 125 calling_len = (*p >> 4) & 0x0F; 126 127 called = called_addr->x25_addr; 128 calling = calling_addr->x25_addr; 129 p++; 130 131 for (i = 0; i < (called_len + calling_len); i++) { 132 if (i < called_len) { 133 if (i % 2 != 0) { 134 *called++ = ((*p >> 0) & 0x0F) + '0'; 135 p++; 136 } else { 137 *called++ = ((*p >> 4) & 0x0F) + '0'; 138 } 139 } else { 140 if (i % 2 != 0) { 141 *calling++ = ((*p >> 0) & 0x0F) + '0'; 142 p++; 143 } else { 144 *calling++ = ((*p >> 4) & 0x0F) + '0'; 145 } 146 } 147 } 148 149 *called = *calling = '\0'; 150 151 return 1 + (called_len + calling_len + 1) / 2; 152 } 153 154 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 155 struct x25_address *calling_addr) 156 { 157 unsigned int called_len, calling_len; 158 char *called, *calling; 159 int i; 160 161 called = called_addr->x25_addr; 162 calling = calling_addr->x25_addr; 163 164 called_len = strlen(called); 165 calling_len = strlen(calling); 166 167 *p++ = (calling_len << 4) | (called_len << 0); 168 169 for (i = 0; i < (called_len + calling_len); i++) { 170 if (i < called_len) { 171 if (i % 2 != 0) { 172 *p |= (*called++ - '0') << 0; 173 p++; 174 } else { 175 *p = 0x00; 176 *p |= (*called++ - '0') << 4; 177 } 178 } else { 179 if (i % 2 != 0) { 180 *p |= (*calling++ - '0') << 0; 181 p++; 182 } else { 183 *p = 0x00; 184 *p |= (*calling++ - '0') << 4; 185 } 186 } 187 } 188 189 return 1 + (called_len + calling_len + 1) / 2; 190 } 191 192 /* 193 * Socket removal during an interrupt is now safe. 194 */ 195 static void x25_remove_socket(struct sock *sk) 196 { 197 write_lock_bh(&x25_list_lock); 198 sk_del_node_init(sk); 199 write_unlock_bh(&x25_list_lock); 200 } 201 202 /* 203 * Kill all bound sockets on a dropped device. 204 */ 205 static void x25_kill_by_device(struct net_device *dev) 206 { 207 struct sock *s; 208 209 write_lock_bh(&x25_list_lock); 210 211 sk_for_each(s, &x25_list) 212 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 213 x25_disconnect(s, ENETUNREACH, 0, 0); 214 215 write_unlock_bh(&x25_list_lock); 216 } 217 218 /* 219 * Handle device status changes. 220 */ 221 static int x25_device_event(struct notifier_block *this, unsigned long event, 222 void *ptr) 223 { 224 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 225 struct x25_neigh *nb; 226 227 if (!net_eq(dev_net(dev), &init_net)) 228 return NOTIFY_DONE; 229 230 if (dev->type == ARPHRD_X25 231 #if IS_ENABLED(CONFIG_LLC) 232 || dev->type == ARPHRD_ETHER 233 #endif 234 ) { 235 switch (event) { 236 case NETDEV_UP: 237 x25_link_device_up(dev); 238 break; 239 case NETDEV_GOING_DOWN: 240 nb = x25_get_neigh(dev); 241 if (nb) { 242 x25_terminate_link(nb); 243 x25_neigh_put(nb); 244 } 245 break; 246 case NETDEV_DOWN: 247 x25_kill_by_device(dev); 248 x25_route_device_down(dev); 249 x25_link_device_down(dev); 250 break; 251 } 252 } 253 254 return NOTIFY_DONE; 255 } 256 257 /* 258 * Add a socket to the bound sockets list. 259 */ 260 static void x25_insert_socket(struct sock *sk) 261 { 262 write_lock_bh(&x25_list_lock); 263 sk_add_node(sk, &x25_list); 264 write_unlock_bh(&x25_list_lock); 265 } 266 267 /* 268 * Find a socket that wants to accept the Call Request we just 269 * received. Check the full list for an address/cud match. 270 * If no cuds match return the next_best thing, an address match. 271 * Note: if a listening socket has cud set it must only get calls 272 * with matching cud. 273 */ 274 static struct sock *x25_find_listener(struct x25_address *addr, 275 struct sk_buff *skb) 276 { 277 struct sock *s; 278 struct sock *next_best; 279 280 read_lock_bh(&x25_list_lock); 281 next_best = NULL; 282 283 sk_for_each(s, &x25_list) 284 if ((!strcmp(addr->x25_addr, 285 x25_sk(s)->source_addr.x25_addr) || 286 !strcmp(x25_sk(s)->source_addr.x25_addr, 287 null_x25_address.x25_addr)) && 288 s->sk_state == TCP_LISTEN) { 289 /* 290 * Found a listening socket, now check the incoming 291 * call user data vs this sockets call user data 292 */ 293 if (x25_sk(s)->cudmatchlength > 0 && 294 skb->len >= x25_sk(s)->cudmatchlength) { 295 if((memcmp(x25_sk(s)->calluserdata.cuddata, 296 skb->data, 297 x25_sk(s)->cudmatchlength)) == 0) { 298 sock_hold(s); 299 goto found; 300 } 301 } else 302 next_best = s; 303 } 304 if (next_best) { 305 s = next_best; 306 sock_hold(s); 307 goto found; 308 } 309 s = NULL; 310 found: 311 read_unlock_bh(&x25_list_lock); 312 return s; 313 } 314 315 /* 316 * Find a connected X.25 socket given my LCI and neighbour. 317 */ 318 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 319 { 320 struct sock *s; 321 322 sk_for_each(s, &x25_list) 323 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 324 sock_hold(s); 325 goto found; 326 } 327 s = NULL; 328 found: 329 return s; 330 } 331 332 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 333 { 334 struct sock *s; 335 336 read_lock_bh(&x25_list_lock); 337 s = __x25_find_socket(lci, nb); 338 read_unlock_bh(&x25_list_lock); 339 return s; 340 } 341 342 /* 343 * Find a unique LCI for a given device. 344 */ 345 static unsigned int x25_new_lci(struct x25_neigh *nb) 346 { 347 unsigned int lci = 1; 348 struct sock *sk; 349 350 while ((sk = x25_find_socket(lci, nb)) != NULL) { 351 sock_put(sk); 352 if (++lci == 4096) { 353 lci = 0; 354 break; 355 } 356 cond_resched(); 357 } 358 359 return lci; 360 } 361 362 /* 363 * Deferred destroy. 364 */ 365 static void __x25_destroy_socket(struct sock *); 366 367 /* 368 * handler for deferred kills. 369 */ 370 static void x25_destroy_timer(struct timer_list *t) 371 { 372 struct sock *sk = from_timer(sk, t, sk_timer); 373 374 x25_destroy_socket_from_timer(sk); 375 } 376 377 /* 378 * This is called from user mode and the timers. Thus it protects itself 379 * against interrupt users but doesn't worry about being called during 380 * work. Once it is removed from the queue no interrupt or bottom half 381 * will touch it and we are (fairly 8-) ) safe. 382 * Not static as it's used by the timer 383 */ 384 static void __x25_destroy_socket(struct sock *sk) 385 { 386 struct sk_buff *skb; 387 388 x25_stop_heartbeat(sk); 389 x25_stop_timer(sk); 390 391 x25_remove_socket(sk); 392 x25_clear_queues(sk); /* Flush the queues */ 393 394 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 395 if (skb->sk != sk) { /* A pending connection */ 396 /* 397 * Queue the unaccepted socket for death 398 */ 399 skb->sk->sk_state = TCP_LISTEN; 400 sock_set_flag(skb->sk, SOCK_DEAD); 401 x25_start_heartbeat(skb->sk); 402 x25_sk(skb->sk)->state = X25_STATE_0; 403 } 404 405 kfree_skb(skb); 406 } 407 408 if (sk_has_allocations(sk)) { 409 /* Defer: outstanding buffers */ 410 sk->sk_timer.expires = jiffies + 10 * HZ; 411 sk->sk_timer.function = x25_destroy_timer; 412 add_timer(&sk->sk_timer); 413 } else { 414 /* drop last reference so sock_put will free */ 415 __sock_put(sk); 416 } 417 } 418 419 void x25_destroy_socket_from_timer(struct sock *sk) 420 { 421 sock_hold(sk); 422 bh_lock_sock(sk); 423 __x25_destroy_socket(sk); 424 bh_unlock_sock(sk); 425 sock_put(sk); 426 } 427 428 /* 429 * Handling for system calls applied via the various interfaces to a 430 * X.25 socket object. 431 */ 432 433 static int x25_setsockopt(struct socket *sock, int level, int optname, 434 char __user *optval, unsigned int optlen) 435 { 436 int opt; 437 struct sock *sk = sock->sk; 438 int rc = -ENOPROTOOPT; 439 440 if (level != SOL_X25 || optname != X25_QBITINCL) 441 goto out; 442 443 rc = -EINVAL; 444 if (optlen < sizeof(int)) 445 goto out; 446 447 rc = -EFAULT; 448 if (get_user(opt, (int __user *)optval)) 449 goto out; 450 451 if (opt) 452 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 453 else 454 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 455 rc = 0; 456 out: 457 return rc; 458 } 459 460 static int x25_getsockopt(struct socket *sock, int level, int optname, 461 char __user *optval, int __user *optlen) 462 { 463 struct sock *sk = sock->sk; 464 int val, len, rc = -ENOPROTOOPT; 465 466 if (level != SOL_X25 || optname != X25_QBITINCL) 467 goto out; 468 469 rc = -EFAULT; 470 if (get_user(len, optlen)) 471 goto out; 472 473 len = min_t(unsigned int, len, sizeof(int)); 474 475 rc = -EINVAL; 476 if (len < 0) 477 goto out; 478 479 rc = -EFAULT; 480 if (put_user(len, optlen)) 481 goto out; 482 483 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 484 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 485 out: 486 return rc; 487 } 488 489 static int x25_listen(struct socket *sock, int backlog) 490 { 491 struct sock *sk = sock->sk; 492 int rc = -EOPNOTSUPP; 493 494 lock_sock(sk); 495 if (sk->sk_state != TCP_LISTEN) { 496 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 497 sk->sk_max_ack_backlog = backlog; 498 sk->sk_state = TCP_LISTEN; 499 rc = 0; 500 } 501 release_sock(sk); 502 503 return rc; 504 } 505 506 static struct proto x25_proto = { 507 .name = "X25", 508 .owner = THIS_MODULE, 509 .obj_size = sizeof(struct x25_sock), 510 }; 511 512 static struct sock *x25_alloc_socket(struct net *net, int kern) 513 { 514 struct x25_sock *x25; 515 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 516 517 if (!sk) 518 goto out; 519 520 sock_init_data(NULL, sk); 521 522 x25 = x25_sk(sk); 523 skb_queue_head_init(&x25->ack_queue); 524 skb_queue_head_init(&x25->fragment_queue); 525 skb_queue_head_init(&x25->interrupt_in_queue); 526 skb_queue_head_init(&x25->interrupt_out_queue); 527 out: 528 return sk; 529 } 530 531 static int x25_create(struct net *net, struct socket *sock, int protocol, 532 int kern) 533 { 534 struct sock *sk; 535 struct x25_sock *x25; 536 int rc = -EAFNOSUPPORT; 537 538 if (!net_eq(net, &init_net)) 539 goto out; 540 541 rc = -ESOCKTNOSUPPORT; 542 if (sock->type != SOCK_SEQPACKET) 543 goto out; 544 545 rc = -EINVAL; 546 if (protocol) 547 goto out; 548 549 rc = -ENOBUFS; 550 if ((sk = x25_alloc_socket(net, kern)) == NULL) 551 goto out; 552 553 x25 = x25_sk(sk); 554 555 sock_init_data(sock, sk); 556 557 x25_init_timers(sk); 558 559 sock->ops = &x25_proto_ops; 560 sk->sk_protocol = protocol; 561 sk->sk_backlog_rcv = x25_backlog_rcv; 562 563 x25->t21 = sysctl_x25_call_request_timeout; 564 x25->t22 = sysctl_x25_reset_request_timeout; 565 x25->t23 = sysctl_x25_clear_request_timeout; 566 x25->t2 = sysctl_x25_ack_holdback_timeout; 567 x25->state = X25_STATE_0; 568 x25->cudmatchlength = 0; 569 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 570 /* on call accept */ 571 572 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 573 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 574 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 575 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 576 x25->facilities.throughput = 0; /* by default don't negotiate 577 throughput */ 578 x25->facilities.reverse = X25_DEFAULT_REVERSE; 579 x25->dte_facilities.calling_len = 0; 580 x25->dte_facilities.called_len = 0; 581 memset(x25->dte_facilities.called_ae, '\0', 582 sizeof(x25->dte_facilities.called_ae)); 583 memset(x25->dte_facilities.calling_ae, '\0', 584 sizeof(x25->dte_facilities.calling_ae)); 585 586 rc = 0; 587 out: 588 return rc; 589 } 590 591 static struct sock *x25_make_new(struct sock *osk) 592 { 593 struct sock *sk = NULL; 594 struct x25_sock *x25, *ox25; 595 596 if (osk->sk_type != SOCK_SEQPACKET) 597 goto out; 598 599 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 600 goto out; 601 602 x25 = x25_sk(sk); 603 604 sk->sk_type = osk->sk_type; 605 sk->sk_priority = osk->sk_priority; 606 sk->sk_protocol = osk->sk_protocol; 607 sk->sk_rcvbuf = osk->sk_rcvbuf; 608 sk->sk_sndbuf = osk->sk_sndbuf; 609 sk->sk_state = TCP_ESTABLISHED; 610 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 611 sock_copy_flags(sk, osk); 612 613 ox25 = x25_sk(osk); 614 x25->t21 = ox25->t21; 615 x25->t22 = ox25->t22; 616 x25->t23 = ox25->t23; 617 x25->t2 = ox25->t2; 618 x25->flags = ox25->flags; 619 x25->facilities = ox25->facilities; 620 x25->dte_facilities = ox25->dte_facilities; 621 x25->cudmatchlength = ox25->cudmatchlength; 622 623 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 624 x25_init_timers(sk); 625 out: 626 return sk; 627 } 628 629 static int x25_release(struct socket *sock) 630 { 631 struct sock *sk = sock->sk; 632 struct x25_sock *x25; 633 634 if (!sk) 635 return 0; 636 637 x25 = x25_sk(sk); 638 639 sock_hold(sk); 640 lock_sock(sk); 641 switch (x25->state) { 642 643 case X25_STATE_0: 644 case X25_STATE_2: 645 x25_disconnect(sk, 0, 0, 0); 646 __x25_destroy_socket(sk); 647 goto out; 648 649 case X25_STATE_1: 650 case X25_STATE_3: 651 case X25_STATE_4: 652 x25_clear_queues(sk); 653 x25_write_internal(sk, X25_CLEAR_REQUEST); 654 x25_start_t23timer(sk); 655 x25->state = X25_STATE_2; 656 sk->sk_state = TCP_CLOSE; 657 sk->sk_shutdown |= SEND_SHUTDOWN; 658 sk->sk_state_change(sk); 659 sock_set_flag(sk, SOCK_DEAD); 660 sock_set_flag(sk, SOCK_DESTROY); 661 break; 662 663 case X25_STATE_5: 664 x25_write_internal(sk, X25_CLEAR_REQUEST); 665 x25_disconnect(sk, 0, 0, 0); 666 __x25_destroy_socket(sk); 667 goto out; 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 (addr_len != sizeof(struct sockaddr_x25) || 684 addr->sx25_family != AF_X25) { 685 rc = -EINVAL; 686 goto out; 687 } 688 689 /* check for the null_x25_address */ 690 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { 691 692 len = strlen(addr->sx25_addr.x25_addr); 693 for (i = 0; i < len; i++) { 694 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 695 rc = -EINVAL; 696 goto out; 697 } 698 } 699 } 700 701 lock_sock(sk); 702 if (sock_flag(sk, SOCK_ZAPPED)) { 703 x25_sk(sk)->source_addr = addr->sx25_addr; 704 x25_insert_socket(sk); 705 sock_reset_flag(sk, SOCK_ZAPPED); 706 } else { 707 rc = -EINVAL; 708 } 709 release_sock(sk); 710 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 711 out: 712 return rc; 713 } 714 715 static int x25_wait_for_connection_establishment(struct sock *sk) 716 { 717 DECLARE_WAITQUEUE(wait, current); 718 int rc; 719 720 add_wait_queue_exclusive(sk_sleep(sk), &wait); 721 for (;;) { 722 __set_current_state(TASK_INTERRUPTIBLE); 723 rc = -ERESTARTSYS; 724 if (signal_pending(current)) 725 break; 726 rc = sock_error(sk); 727 if (rc) { 728 sk->sk_socket->state = SS_UNCONNECTED; 729 break; 730 } 731 rc = 0; 732 if (sk->sk_state != TCP_ESTABLISHED) { 733 release_sock(sk); 734 schedule(); 735 lock_sock(sk); 736 } else 737 break; 738 } 739 __set_current_state(TASK_RUNNING); 740 remove_wait_queue(sk_sleep(sk), &wait); 741 return rc; 742 } 743 744 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 745 int addr_len, int flags) 746 { 747 struct sock *sk = sock->sk; 748 struct x25_sock *x25 = x25_sk(sk); 749 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 750 struct x25_route *rt; 751 int rc = 0; 752 753 lock_sock(sk); 754 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 755 sock->state = SS_CONNECTED; 756 goto out; /* Connect completed during a ERESTARTSYS event */ 757 } 758 759 rc = -ECONNREFUSED; 760 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 761 sock->state = SS_UNCONNECTED; 762 goto out; 763 } 764 765 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 766 if (sk->sk_state == TCP_ESTABLISHED) 767 goto out; 768 769 sk->sk_state = TCP_CLOSE; 770 sock->state = SS_UNCONNECTED; 771 772 rc = -EINVAL; 773 if (addr_len != sizeof(struct sockaddr_x25) || 774 addr->sx25_family != AF_X25) 775 goto out; 776 777 rc = -ENETUNREACH; 778 rt = x25_get_route(&addr->sx25_addr); 779 if (!rt) 780 goto out; 781 782 x25->neighbour = x25_get_neigh(rt->dev); 783 if (!x25->neighbour) 784 goto out_put_route; 785 786 x25_limit_facilities(&x25->facilities, x25->neighbour); 787 788 x25->lci = x25_new_lci(x25->neighbour); 789 if (!x25->lci) 790 goto out_put_neigh; 791 792 rc = -EINVAL; 793 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 794 goto out_put_neigh; 795 796 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 797 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 798 799 x25->dest_addr = addr->sx25_addr; 800 801 /* Move to connecting socket, start sending Connect Requests */ 802 sock->state = SS_CONNECTING; 803 sk->sk_state = TCP_SYN_SENT; 804 805 x25->state = X25_STATE_1; 806 807 x25_write_internal(sk, X25_CALL_REQUEST); 808 809 x25_start_heartbeat(sk); 810 x25_start_t21timer(sk); 811 812 /* Now the loop */ 813 rc = -EINPROGRESS; 814 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 815 goto out_put_neigh; 816 817 rc = x25_wait_for_connection_establishment(sk); 818 if (rc) 819 goto out_put_neigh; 820 821 sock->state = SS_CONNECTED; 822 rc = 0; 823 out_put_neigh: 824 if (rc) { 825 read_lock_bh(&x25_list_lock); 826 x25_neigh_put(x25->neighbour); 827 x25->neighbour = NULL; 828 read_unlock_bh(&x25_list_lock); 829 x25->state = X25_STATE_0; 830 } 831 out_put_route: 832 x25_route_put(rt); 833 out: 834 release_sock(sk); 835 return rc; 836 } 837 838 static int x25_wait_for_data(struct sock *sk, long timeout) 839 { 840 DECLARE_WAITQUEUE(wait, current); 841 int rc = 0; 842 843 add_wait_queue_exclusive(sk_sleep(sk), &wait); 844 for (;;) { 845 __set_current_state(TASK_INTERRUPTIBLE); 846 if (sk->sk_shutdown & RCV_SHUTDOWN) 847 break; 848 rc = -ERESTARTSYS; 849 if (signal_pending(current)) 850 break; 851 rc = -EAGAIN; 852 if (!timeout) 853 break; 854 rc = 0; 855 if (skb_queue_empty(&sk->sk_receive_queue)) { 856 release_sock(sk); 857 timeout = schedule_timeout(timeout); 858 lock_sock(sk); 859 } else 860 break; 861 } 862 __set_current_state(TASK_RUNNING); 863 remove_wait_queue(sk_sleep(sk), &wait); 864 return rc; 865 } 866 867 static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 868 bool kern) 869 { 870 struct sock *sk = sock->sk; 871 struct sock *newsk; 872 struct sk_buff *skb; 873 int rc = -EINVAL; 874 875 if (!sk) 876 goto out; 877 878 rc = -EOPNOTSUPP; 879 if (sk->sk_type != SOCK_SEQPACKET) 880 goto out; 881 882 lock_sock(sk); 883 rc = -EINVAL; 884 if (sk->sk_state != TCP_LISTEN) 885 goto out2; 886 887 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 888 if (rc) 889 goto out2; 890 skb = skb_dequeue(&sk->sk_receive_queue); 891 rc = -EINVAL; 892 if (!skb->sk) 893 goto out2; 894 newsk = skb->sk; 895 sock_graft(newsk, newsock); 896 897 /* Now attach up the new socket */ 898 skb->sk = NULL; 899 kfree_skb(skb); 900 sk_acceptq_removed(sk); 901 newsock->state = SS_CONNECTED; 902 rc = 0; 903 out2: 904 release_sock(sk); 905 out: 906 return rc; 907 } 908 909 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 910 int peer) 911 { 912 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 913 struct sock *sk = sock->sk; 914 struct x25_sock *x25 = x25_sk(sk); 915 int rc = 0; 916 917 if (peer) { 918 if (sk->sk_state != TCP_ESTABLISHED) { 919 rc = -ENOTCONN; 920 goto out; 921 } 922 sx25->sx25_addr = x25->dest_addr; 923 } else 924 sx25->sx25_addr = x25->source_addr; 925 926 sx25->sx25_family = AF_X25; 927 rc = sizeof(*sx25); 928 929 out: 930 return rc; 931 } 932 933 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 934 unsigned int lci) 935 { 936 struct sock *sk; 937 struct sock *make; 938 struct x25_sock *makex25; 939 struct x25_address source_addr, dest_addr; 940 struct x25_facilities facilities; 941 struct x25_dte_facilities dte_facilities; 942 int len, addr_len, rc; 943 944 /* 945 * Remove the LCI and frame type. 946 */ 947 skb_pull(skb, X25_STD_MIN_LEN); 948 949 /* 950 * Extract the X.25 addresses and convert them to ASCII strings, 951 * and remove them. 952 * 953 * Address block is mandatory in call request packets 954 */ 955 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 956 if (addr_len <= 0) 957 goto out_clear_request; 958 skb_pull(skb, addr_len); 959 960 /* 961 * Get the length of the facilities, skip past them for the moment 962 * get the call user data because this is needed to determine 963 * the correct listener 964 * 965 * Facilities length is mandatory in call request packets 966 */ 967 if (!pskb_may_pull(skb, 1)) 968 goto out_clear_request; 969 len = skb->data[0] + 1; 970 if (!pskb_may_pull(skb, len)) 971 goto out_clear_request; 972 skb_pull(skb,len); 973 974 /* 975 * Ensure that the amount of call user data is valid. 976 */ 977 if (skb->len > X25_MAX_CUD_LEN) 978 goto out_clear_request; 979 980 /* 981 * Get all the call user data so it can be used in 982 * x25_find_listener and skb_copy_from_linear_data up ahead. 983 */ 984 if (!pskb_may_pull(skb, skb->len)) 985 goto out_clear_request; 986 987 /* 988 * Find a listener for the particular address/cud pair. 989 */ 990 sk = x25_find_listener(&source_addr,skb); 991 skb_push(skb,len); 992 993 if (sk != NULL && sk_acceptq_is_full(sk)) { 994 goto out_sock_put; 995 } 996 997 /* 998 * We dont have any listeners for this incoming call. 999 * Try forwarding it. 1000 */ 1001 if (sk == NULL) { 1002 skb_push(skb, addr_len + X25_STD_MIN_LEN); 1003 if (sysctl_x25_forward && 1004 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 1005 { 1006 /* Call was forwarded, dont process it any more */ 1007 kfree_skb(skb); 1008 rc = 1; 1009 goto out; 1010 } else { 1011 /* No listeners, can't forward, clear the call */ 1012 goto out_clear_request; 1013 } 1014 } 1015 1016 /* 1017 * Try to reach a compromise on the requested facilities. 1018 */ 1019 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1020 if (len == -1) 1021 goto out_sock_put; 1022 1023 /* 1024 * current neighbour/link might impose additional limits 1025 * on certain facilties 1026 */ 1027 1028 x25_limit_facilities(&facilities, nb); 1029 1030 /* 1031 * Try to create a new socket. 1032 */ 1033 make = x25_make_new(sk); 1034 if (!make) 1035 goto out_sock_put; 1036 1037 /* 1038 * Remove the facilities 1039 */ 1040 skb_pull(skb, len); 1041 1042 skb->sk = make; 1043 make->sk_state = TCP_ESTABLISHED; 1044 1045 makex25 = x25_sk(make); 1046 makex25->lci = lci; 1047 makex25->dest_addr = dest_addr; 1048 makex25->source_addr = source_addr; 1049 makex25->neighbour = nb; 1050 makex25->facilities = facilities; 1051 makex25->dte_facilities= dte_facilities; 1052 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1053 /* ensure no reverse facil on accept */ 1054 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1055 /* ensure no calling address extension on accept */ 1056 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1057 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1058 1059 /* Normally all calls are accepted immediately */ 1060 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1061 x25_write_internal(make, X25_CALL_ACCEPTED); 1062 makex25->state = X25_STATE_3; 1063 } else { 1064 makex25->state = X25_STATE_5; 1065 } 1066 1067 /* 1068 * Incoming Call User Data. 1069 */ 1070 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1071 makex25->calluserdata.cudlength = skb->len; 1072 1073 sk_acceptq_added(sk); 1074 1075 x25_insert_socket(make); 1076 1077 skb_queue_head(&sk->sk_receive_queue, skb); 1078 1079 x25_start_heartbeat(make); 1080 1081 if (!sock_flag(sk, SOCK_DEAD)) 1082 sk->sk_data_ready(sk); 1083 rc = 1; 1084 sock_put(sk); 1085 out: 1086 return rc; 1087 out_sock_put: 1088 sock_put(sk); 1089 out_clear_request: 1090 rc = 0; 1091 x25_transmit_clear_request(nb, lci, 0x01); 1092 goto out; 1093 } 1094 1095 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1096 { 1097 struct sock *sk = sock->sk; 1098 struct x25_sock *x25 = x25_sk(sk); 1099 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1100 struct sockaddr_x25 sx25; 1101 struct sk_buff *skb; 1102 unsigned char *asmptr; 1103 int noblock = msg->msg_flags & MSG_DONTWAIT; 1104 size_t size; 1105 int qbit = 0, rc = -EINVAL; 1106 1107 lock_sock(sk); 1108 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1109 goto out; 1110 1111 /* we currently don't support segmented records at the user interface */ 1112 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1113 goto out; 1114 1115 rc = -EADDRNOTAVAIL; 1116 if (sock_flag(sk, SOCK_ZAPPED)) 1117 goto out; 1118 1119 rc = -EPIPE; 1120 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1121 send_sig(SIGPIPE, current, 0); 1122 goto out; 1123 } 1124 1125 rc = -ENETUNREACH; 1126 if (!x25->neighbour) 1127 goto out; 1128 1129 if (usx25) { 1130 rc = -EINVAL; 1131 if (msg->msg_namelen < sizeof(sx25)) 1132 goto out; 1133 memcpy(&sx25, usx25, sizeof(sx25)); 1134 rc = -EISCONN; 1135 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1136 goto out; 1137 rc = -EINVAL; 1138 if (sx25.sx25_family != AF_X25) 1139 goto out; 1140 } else { 1141 /* 1142 * FIXME 1003.1g - if the socket is like this because 1143 * it has become closed (not started closed) we ought 1144 * to SIGPIPE, EPIPE; 1145 */ 1146 rc = -ENOTCONN; 1147 if (sk->sk_state != TCP_ESTABLISHED) 1148 goto out; 1149 1150 sx25.sx25_family = AF_X25; 1151 sx25.sx25_addr = x25->dest_addr; 1152 } 1153 1154 /* Sanity check the packet size */ 1155 if (len > 65535) { 1156 rc = -EMSGSIZE; 1157 goto out; 1158 } 1159 1160 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1161 1162 /* Build a packet */ 1163 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1164 1165 if ((msg->msg_flags & MSG_OOB) && len > 32) 1166 len = 32; 1167 1168 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1169 1170 release_sock(sk); 1171 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1172 lock_sock(sk); 1173 if (!skb) 1174 goto out; 1175 X25_SKB_CB(skb)->flags = msg->msg_flags; 1176 1177 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1178 1179 /* 1180 * Put the data on the end 1181 */ 1182 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1183 1184 skb_reset_transport_header(skb); 1185 skb_put(skb, len); 1186 1187 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1188 if (rc) 1189 goto out_kfree_skb; 1190 1191 /* 1192 * If the Q BIT Include socket option is in force, the first 1193 * byte of the user data is the logical value of the Q Bit. 1194 */ 1195 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1196 if (!pskb_may_pull(skb, 1)) 1197 goto out_kfree_skb; 1198 1199 qbit = skb->data[0]; 1200 skb_pull(skb, 1); 1201 } 1202 1203 /* 1204 * Push down the X.25 header 1205 */ 1206 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1207 1208 if (msg->msg_flags & MSG_OOB) { 1209 if (x25->neighbour->extended) { 1210 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1211 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1212 *asmptr++ = (x25->lci >> 0) & 0xFF; 1213 *asmptr++ = X25_INTERRUPT; 1214 } else { 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_INTERRUPT; 1219 } 1220 } else { 1221 if (x25->neighbour->extended) { 1222 /* Build an Extended X.25 header */ 1223 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1224 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1225 *asmptr++ = (x25->lci >> 0) & 0xFF; 1226 *asmptr++ = X25_DATA; 1227 *asmptr++ = X25_DATA; 1228 } else { 1229 /* Build an Standard X.25 header */ 1230 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1231 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1232 *asmptr++ = (x25->lci >> 0) & 0xFF; 1233 *asmptr++ = X25_DATA; 1234 } 1235 1236 if (qbit) 1237 skb->data[0] |= X25_Q_BIT; 1238 } 1239 1240 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1241 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1242 1243 rc = -ENOTCONN; 1244 if (sk->sk_state != TCP_ESTABLISHED) 1245 goto out_kfree_skb; 1246 1247 if (msg->msg_flags & MSG_OOB) 1248 skb_queue_tail(&x25->interrupt_out_queue, skb); 1249 else { 1250 rc = x25_output(sk, skb); 1251 len = rc; 1252 if (rc < 0) 1253 kfree_skb(skb); 1254 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1255 len++; 1256 } 1257 1258 x25_kick(sk); 1259 rc = len; 1260 out: 1261 release_sock(sk); 1262 return rc; 1263 out_kfree_skb: 1264 kfree_skb(skb); 1265 goto out; 1266 } 1267 1268 1269 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1270 int flags) 1271 { 1272 struct sock *sk = sock->sk; 1273 struct x25_sock *x25 = x25_sk(sk); 1274 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1275 size_t copied; 1276 int qbit, header_len; 1277 struct sk_buff *skb; 1278 unsigned char *asmptr; 1279 int rc = -ENOTCONN; 1280 1281 lock_sock(sk); 1282 1283 if (x25->neighbour == NULL) 1284 goto out; 1285 1286 header_len = x25->neighbour->extended ? 1287 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1288 1289 /* 1290 * This works for seqpacket too. The receiver has ordered the queue for 1291 * us! We do one quick check first though 1292 */ 1293 if (sk->sk_state != TCP_ESTABLISHED) 1294 goto out; 1295 1296 if (flags & MSG_OOB) { 1297 rc = -EINVAL; 1298 if (sock_flag(sk, SOCK_URGINLINE) || 1299 !skb_peek(&x25->interrupt_in_queue)) 1300 goto out; 1301 1302 skb = skb_dequeue(&x25->interrupt_in_queue); 1303 1304 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1305 goto out_free_dgram; 1306 1307 skb_pull(skb, X25_STD_MIN_LEN); 1308 1309 /* 1310 * No Q bit information on Interrupt data. 1311 */ 1312 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1313 asmptr = skb_push(skb, 1); 1314 *asmptr = 0x00; 1315 } 1316 1317 msg->msg_flags |= MSG_OOB; 1318 } else { 1319 /* Now we can treat all alike */ 1320 release_sock(sk); 1321 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1322 flags & MSG_DONTWAIT, &rc); 1323 lock_sock(sk); 1324 if (!skb) 1325 goto out; 1326 1327 if (!pskb_may_pull(skb, header_len)) 1328 goto out_free_dgram; 1329 1330 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1331 1332 skb_pull(skb, header_len); 1333 1334 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1335 asmptr = skb_push(skb, 1); 1336 *asmptr = qbit; 1337 } 1338 } 1339 1340 skb_reset_transport_header(skb); 1341 copied = skb->len; 1342 1343 if (copied > size) { 1344 copied = size; 1345 msg->msg_flags |= MSG_TRUNC; 1346 } 1347 1348 /* Currently, each datagram always contains a complete record */ 1349 msg->msg_flags |= MSG_EOR; 1350 1351 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1352 if (rc) 1353 goto out_free_dgram; 1354 1355 if (sx25) { 1356 sx25->sx25_family = AF_X25; 1357 sx25->sx25_addr = x25->dest_addr; 1358 msg->msg_namelen = sizeof(*sx25); 1359 } 1360 1361 x25_check_rbuf(sk); 1362 rc = copied; 1363 out_free_dgram: 1364 skb_free_datagram(sk, skb); 1365 out: 1366 release_sock(sk); 1367 return rc; 1368 } 1369 1370 1371 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1372 { 1373 struct sock *sk = sock->sk; 1374 struct x25_sock *x25 = x25_sk(sk); 1375 void __user *argp = (void __user *)arg; 1376 int rc; 1377 1378 switch (cmd) { 1379 case TIOCOUTQ: { 1380 int amount; 1381 1382 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1383 if (amount < 0) 1384 amount = 0; 1385 rc = put_user(amount, (unsigned int __user *)argp); 1386 break; 1387 } 1388 1389 case TIOCINQ: { 1390 struct sk_buff *skb; 1391 int amount = 0; 1392 /* 1393 * These two are safe on a single CPU system as 1394 * only user tasks fiddle here 1395 */ 1396 lock_sock(sk); 1397 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1398 amount = skb->len; 1399 release_sock(sk); 1400 rc = put_user(amount, (unsigned int __user *)argp); 1401 break; 1402 } 1403 1404 case SIOCGIFADDR: 1405 case SIOCSIFADDR: 1406 case SIOCGIFDSTADDR: 1407 case SIOCSIFDSTADDR: 1408 case SIOCGIFBRDADDR: 1409 case SIOCSIFBRDADDR: 1410 case SIOCGIFNETMASK: 1411 case SIOCSIFNETMASK: 1412 case SIOCGIFMETRIC: 1413 case SIOCSIFMETRIC: 1414 rc = -EINVAL; 1415 break; 1416 case SIOCADDRT: 1417 case SIOCDELRT: 1418 rc = -EPERM; 1419 if (!capable(CAP_NET_ADMIN)) 1420 break; 1421 rc = x25_route_ioctl(cmd, argp); 1422 break; 1423 case SIOCX25GSUBSCRIP: 1424 rc = x25_subscr_ioctl(cmd, argp); 1425 break; 1426 case SIOCX25SSUBSCRIP: 1427 rc = -EPERM; 1428 if (!capable(CAP_NET_ADMIN)) 1429 break; 1430 rc = x25_subscr_ioctl(cmd, argp); 1431 break; 1432 case SIOCX25GFACILITIES: { 1433 lock_sock(sk); 1434 rc = copy_to_user(argp, &x25->facilities, 1435 sizeof(x25->facilities)) 1436 ? -EFAULT : 0; 1437 release_sock(sk); 1438 break; 1439 } 1440 1441 case SIOCX25SFACILITIES: { 1442 struct x25_facilities facilities; 1443 rc = -EFAULT; 1444 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1445 break; 1446 rc = -EINVAL; 1447 lock_sock(sk); 1448 if (sk->sk_state != TCP_LISTEN && 1449 sk->sk_state != TCP_CLOSE) 1450 goto out_fac_release; 1451 if (facilities.pacsize_in < X25_PS16 || 1452 facilities.pacsize_in > X25_PS4096) 1453 goto out_fac_release; 1454 if (facilities.pacsize_out < X25_PS16 || 1455 facilities.pacsize_out > X25_PS4096) 1456 goto out_fac_release; 1457 if (facilities.winsize_in < 1 || 1458 facilities.winsize_in > 127) 1459 goto out_fac_release; 1460 if (facilities.throughput) { 1461 int out = facilities.throughput & 0xf0; 1462 int in = facilities.throughput & 0x0f; 1463 if (!out) 1464 facilities.throughput |= 1465 X25_DEFAULT_THROUGHPUT << 4; 1466 else if (out < 0x30 || out > 0xD0) 1467 goto out_fac_release; 1468 if (!in) 1469 facilities.throughput |= 1470 X25_DEFAULT_THROUGHPUT; 1471 else if (in < 0x03 || in > 0x0D) 1472 goto out_fac_release; 1473 } 1474 if (facilities.reverse && 1475 (facilities.reverse & 0x81) != 0x81) 1476 goto out_fac_release; 1477 x25->facilities = facilities; 1478 rc = 0; 1479 out_fac_release: 1480 release_sock(sk); 1481 break; 1482 } 1483 1484 case SIOCX25GDTEFACILITIES: { 1485 lock_sock(sk); 1486 rc = copy_to_user(argp, &x25->dte_facilities, 1487 sizeof(x25->dte_facilities)); 1488 release_sock(sk); 1489 if (rc) 1490 rc = -EFAULT; 1491 break; 1492 } 1493 1494 case SIOCX25SDTEFACILITIES: { 1495 struct x25_dte_facilities dtefacs; 1496 rc = -EFAULT; 1497 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1498 break; 1499 rc = -EINVAL; 1500 lock_sock(sk); 1501 if (sk->sk_state != TCP_LISTEN && 1502 sk->sk_state != TCP_CLOSE) 1503 goto out_dtefac_release; 1504 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1505 goto out_dtefac_release; 1506 if (dtefacs.called_len > X25_MAX_AE_LEN) 1507 goto out_dtefac_release; 1508 x25->dte_facilities = dtefacs; 1509 rc = 0; 1510 out_dtefac_release: 1511 release_sock(sk); 1512 break; 1513 } 1514 1515 case SIOCX25GCALLUSERDATA: { 1516 lock_sock(sk); 1517 rc = copy_to_user(argp, &x25->calluserdata, 1518 sizeof(x25->calluserdata)) 1519 ? -EFAULT : 0; 1520 release_sock(sk); 1521 break; 1522 } 1523 1524 case SIOCX25SCALLUSERDATA: { 1525 struct x25_calluserdata calluserdata; 1526 1527 rc = -EFAULT; 1528 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1529 break; 1530 rc = -EINVAL; 1531 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1532 break; 1533 lock_sock(sk); 1534 x25->calluserdata = calluserdata; 1535 release_sock(sk); 1536 rc = 0; 1537 break; 1538 } 1539 1540 case SIOCX25GCAUSEDIAG: { 1541 lock_sock(sk); 1542 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1543 ? -EFAULT : 0; 1544 release_sock(sk); 1545 break; 1546 } 1547 1548 case SIOCX25SCAUSEDIAG: { 1549 struct x25_causediag causediag; 1550 rc = -EFAULT; 1551 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1552 break; 1553 lock_sock(sk); 1554 x25->causediag = causediag; 1555 release_sock(sk); 1556 rc = 0; 1557 break; 1558 1559 } 1560 1561 case SIOCX25SCUDMATCHLEN: { 1562 struct x25_subaddr sub_addr; 1563 rc = -EINVAL; 1564 lock_sock(sk); 1565 if(sk->sk_state != TCP_CLOSE) 1566 goto out_cud_release; 1567 rc = -EFAULT; 1568 if (copy_from_user(&sub_addr, argp, 1569 sizeof(sub_addr))) 1570 goto out_cud_release; 1571 rc = -EINVAL; 1572 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1573 goto out_cud_release; 1574 x25->cudmatchlength = sub_addr.cudmatchlength; 1575 rc = 0; 1576 out_cud_release: 1577 release_sock(sk); 1578 break; 1579 } 1580 1581 case SIOCX25CALLACCPTAPPRV: { 1582 rc = -EINVAL; 1583 lock_sock(sk); 1584 if (sk->sk_state == TCP_CLOSE) { 1585 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1586 rc = 0; 1587 } 1588 release_sock(sk); 1589 break; 1590 } 1591 1592 case SIOCX25SENDCALLACCPT: { 1593 rc = -EINVAL; 1594 lock_sock(sk); 1595 if (sk->sk_state != TCP_ESTABLISHED) 1596 goto out_sendcallaccpt_release; 1597 /* must call accptapprv above */ 1598 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1599 goto out_sendcallaccpt_release; 1600 x25_write_internal(sk, X25_CALL_ACCEPTED); 1601 x25->state = X25_STATE_3; 1602 rc = 0; 1603 out_sendcallaccpt_release: 1604 release_sock(sk); 1605 break; 1606 } 1607 1608 default: 1609 rc = -ENOIOCTLCMD; 1610 break; 1611 } 1612 1613 return rc; 1614 } 1615 1616 static const struct net_proto_family x25_family_ops = { 1617 .family = AF_X25, 1618 .create = x25_create, 1619 .owner = THIS_MODULE, 1620 }; 1621 1622 #ifdef CONFIG_COMPAT 1623 static int compat_x25_subscr_ioctl(unsigned int cmd, 1624 struct compat_x25_subscrip_struct __user *x25_subscr32) 1625 { 1626 struct compat_x25_subscrip_struct x25_subscr; 1627 struct x25_neigh *nb; 1628 struct net_device *dev; 1629 int rc = -EINVAL; 1630 1631 rc = -EFAULT; 1632 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1633 goto out; 1634 1635 rc = -EINVAL; 1636 dev = x25_dev_get(x25_subscr.device); 1637 if (dev == NULL) 1638 goto out; 1639 1640 nb = x25_get_neigh(dev); 1641 if (nb == NULL) 1642 goto out_dev_put; 1643 1644 dev_put(dev); 1645 1646 if (cmd == SIOCX25GSUBSCRIP) { 1647 read_lock_bh(&x25_neigh_list_lock); 1648 x25_subscr.extended = nb->extended; 1649 x25_subscr.global_facil_mask = nb->global_facil_mask; 1650 read_unlock_bh(&x25_neigh_list_lock); 1651 rc = copy_to_user(x25_subscr32, &x25_subscr, 1652 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1653 } else { 1654 rc = -EINVAL; 1655 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1656 rc = 0; 1657 write_lock_bh(&x25_neigh_list_lock); 1658 nb->extended = x25_subscr.extended; 1659 nb->global_facil_mask = x25_subscr.global_facil_mask; 1660 write_unlock_bh(&x25_neigh_list_lock); 1661 } 1662 } 1663 x25_neigh_put(nb); 1664 out: 1665 return rc; 1666 out_dev_put: 1667 dev_put(dev); 1668 goto out; 1669 } 1670 1671 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1672 unsigned long arg) 1673 { 1674 void __user *argp = compat_ptr(arg); 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 SIOCGIFADDR: 1683 case SIOCSIFADDR: 1684 case SIOCGIFDSTADDR: 1685 case SIOCSIFDSTADDR: 1686 case SIOCGIFBRDADDR: 1687 case SIOCSIFBRDADDR: 1688 case SIOCGIFNETMASK: 1689 case SIOCSIFNETMASK: 1690 case SIOCGIFMETRIC: 1691 case SIOCSIFMETRIC: 1692 rc = -EINVAL; 1693 break; 1694 case SIOCADDRT: 1695 case SIOCDELRT: 1696 rc = -EPERM; 1697 if (!capable(CAP_NET_ADMIN)) 1698 break; 1699 rc = x25_route_ioctl(cmd, argp); 1700 break; 1701 case SIOCX25GSUBSCRIP: 1702 rc = compat_x25_subscr_ioctl(cmd, argp); 1703 break; 1704 case SIOCX25SSUBSCRIP: 1705 rc = -EPERM; 1706 if (!capable(CAP_NET_ADMIN)) 1707 break; 1708 rc = compat_x25_subscr_ioctl(cmd, argp); 1709 break; 1710 case SIOCX25GFACILITIES: 1711 case SIOCX25SFACILITIES: 1712 case SIOCX25GDTEFACILITIES: 1713 case SIOCX25SDTEFACILITIES: 1714 case SIOCX25GCALLUSERDATA: 1715 case SIOCX25SCALLUSERDATA: 1716 case SIOCX25GCAUSEDIAG: 1717 case SIOCX25SCAUSEDIAG: 1718 case SIOCX25SCUDMATCHLEN: 1719 case SIOCX25CALLACCPTAPPRV: 1720 case SIOCX25SENDCALLACCPT: 1721 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1722 break; 1723 default: 1724 rc = -ENOIOCTLCMD; 1725 break; 1726 } 1727 return rc; 1728 } 1729 #endif 1730 1731 static const struct proto_ops x25_proto_ops = { 1732 .family = AF_X25, 1733 .owner = THIS_MODULE, 1734 .release = x25_release, 1735 .bind = x25_bind, 1736 .connect = x25_connect, 1737 .socketpair = sock_no_socketpair, 1738 .accept = x25_accept, 1739 .getname = x25_getname, 1740 .poll = datagram_poll, 1741 .ioctl = x25_ioctl, 1742 #ifdef CONFIG_COMPAT 1743 .compat_ioctl = compat_x25_ioctl, 1744 #endif 1745 .gettstamp = sock_gettstamp, 1746 .listen = x25_listen, 1747 .shutdown = sock_no_shutdown, 1748 .setsockopt = x25_setsockopt, 1749 .getsockopt = x25_getsockopt, 1750 .sendmsg = x25_sendmsg, 1751 .recvmsg = x25_recvmsg, 1752 .mmap = sock_no_mmap, 1753 .sendpage = sock_no_sendpage, 1754 }; 1755 1756 static struct packet_type x25_packet_type __read_mostly = { 1757 .type = cpu_to_be16(ETH_P_X25), 1758 .func = x25_lapb_receive_frame, 1759 }; 1760 1761 static struct notifier_block x25_dev_notifier = { 1762 .notifier_call = x25_device_event, 1763 }; 1764 1765 void x25_kill_by_neigh(struct x25_neigh *nb) 1766 { 1767 struct sock *s; 1768 1769 write_lock_bh(&x25_list_lock); 1770 1771 sk_for_each(s, &x25_list) 1772 if (x25_sk(s)->neighbour == nb) 1773 x25_disconnect(s, ENETUNREACH, 0, 0); 1774 1775 write_unlock_bh(&x25_list_lock); 1776 1777 /* Remove any related forwards */ 1778 x25_clear_forward_by_dev(nb->dev); 1779 } 1780 1781 static int __init x25_init(void) 1782 { 1783 int rc; 1784 1785 rc = proto_register(&x25_proto, 0); 1786 if (rc) 1787 goto out; 1788 1789 rc = sock_register(&x25_family_ops); 1790 if (rc) 1791 goto out_proto; 1792 1793 dev_add_pack(&x25_packet_type); 1794 1795 rc = register_netdevice_notifier(&x25_dev_notifier); 1796 if (rc) 1797 goto out_sock; 1798 1799 rc = x25_register_sysctl(); 1800 if (rc) 1801 goto out_dev; 1802 1803 rc = x25_proc_init(); 1804 if (rc) 1805 goto out_sysctl; 1806 1807 pr_info("Linux Version 0.2\n"); 1808 1809 out: 1810 return rc; 1811 out_sysctl: 1812 x25_unregister_sysctl(); 1813 out_dev: 1814 unregister_netdevice_notifier(&x25_dev_notifier); 1815 out_sock: 1816 dev_remove_pack(&x25_packet_type); 1817 sock_unregister(AF_X25); 1818 out_proto: 1819 proto_unregister(&x25_proto); 1820 goto out; 1821 } 1822 module_init(x25_init); 1823 1824 static void __exit x25_exit(void) 1825 { 1826 x25_proc_exit(); 1827 x25_link_free(); 1828 x25_route_free(); 1829 1830 x25_unregister_sysctl(); 1831 1832 unregister_netdevice_notifier(&x25_dev_notifier); 1833 1834 dev_remove_pack(&x25_packet_type); 1835 1836 sock_unregister(AF_X25); 1837 proto_unregister(&x25_proto); 1838 } 1839 module_exit(x25_exit); 1840 1841 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1842 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1843 MODULE_LICENSE("GPL"); 1844 MODULE_ALIAS_NETPROTO(PF_X25); 1845