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 sockptr_t 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 (copy_from_sockptr(&opt, optval, sizeof(int))) 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 rc = -EALREADY; /* Do nothing if call is already in progress */ 770 if (sk->sk_state == TCP_SYN_SENT) 771 goto out; 772 773 sk->sk_state = TCP_CLOSE; 774 sock->state = SS_UNCONNECTED; 775 776 rc = -EINVAL; 777 if (addr_len != sizeof(struct sockaddr_x25) || 778 addr->sx25_family != AF_X25) 779 goto out; 780 781 rc = -ENETUNREACH; 782 rt = x25_get_route(&addr->sx25_addr); 783 if (!rt) 784 goto out; 785 786 x25->neighbour = x25_get_neigh(rt->dev); 787 if (!x25->neighbour) 788 goto out_put_route; 789 790 x25_limit_facilities(&x25->facilities, x25->neighbour); 791 792 x25->lci = x25_new_lci(x25->neighbour); 793 if (!x25->lci) 794 goto out_put_neigh; 795 796 rc = -EINVAL; 797 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 798 goto out_put_neigh; 799 800 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 801 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 802 803 x25->dest_addr = addr->sx25_addr; 804 805 /* Move to connecting socket, start sending Connect Requests */ 806 sock->state = SS_CONNECTING; 807 sk->sk_state = TCP_SYN_SENT; 808 809 x25->state = X25_STATE_1; 810 811 x25_write_internal(sk, X25_CALL_REQUEST); 812 813 x25_start_heartbeat(sk); 814 x25_start_t21timer(sk); 815 816 /* Now the loop */ 817 rc = -EINPROGRESS; 818 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 819 goto out; 820 821 rc = x25_wait_for_connection_establishment(sk); 822 if (rc) 823 goto out_put_neigh; 824 825 sock->state = SS_CONNECTED; 826 rc = 0; 827 out_put_neigh: 828 if (rc) { 829 read_lock_bh(&x25_list_lock); 830 x25_neigh_put(x25->neighbour); 831 x25->neighbour = NULL; 832 read_unlock_bh(&x25_list_lock); 833 x25->state = X25_STATE_0; 834 } 835 out_put_route: 836 x25_route_put(rt); 837 out: 838 release_sock(sk); 839 return rc; 840 } 841 842 static int x25_wait_for_data(struct sock *sk, long timeout) 843 { 844 DECLARE_WAITQUEUE(wait, current); 845 int rc = 0; 846 847 add_wait_queue_exclusive(sk_sleep(sk), &wait); 848 for (;;) { 849 __set_current_state(TASK_INTERRUPTIBLE); 850 if (sk->sk_shutdown & RCV_SHUTDOWN) 851 break; 852 rc = -ERESTARTSYS; 853 if (signal_pending(current)) 854 break; 855 rc = -EAGAIN; 856 if (!timeout) 857 break; 858 rc = 0; 859 if (skb_queue_empty(&sk->sk_receive_queue)) { 860 release_sock(sk); 861 timeout = schedule_timeout(timeout); 862 lock_sock(sk); 863 } else 864 break; 865 } 866 __set_current_state(TASK_RUNNING); 867 remove_wait_queue(sk_sleep(sk), &wait); 868 return rc; 869 } 870 871 static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 872 bool kern) 873 { 874 struct sock *sk = sock->sk; 875 struct sock *newsk; 876 struct sk_buff *skb; 877 int rc = -EINVAL; 878 879 if (!sk) 880 goto out; 881 882 rc = -EOPNOTSUPP; 883 if (sk->sk_type != SOCK_SEQPACKET) 884 goto out; 885 886 lock_sock(sk); 887 rc = -EINVAL; 888 if (sk->sk_state != TCP_LISTEN) 889 goto out2; 890 891 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 892 if (rc) 893 goto out2; 894 skb = skb_dequeue(&sk->sk_receive_queue); 895 rc = -EINVAL; 896 if (!skb->sk) 897 goto out2; 898 newsk = skb->sk; 899 sock_graft(newsk, newsock); 900 901 /* Now attach up the new socket */ 902 skb->sk = NULL; 903 kfree_skb(skb); 904 sk_acceptq_removed(sk); 905 newsock->state = SS_CONNECTED; 906 rc = 0; 907 out2: 908 release_sock(sk); 909 out: 910 return rc; 911 } 912 913 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 914 int peer) 915 { 916 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 917 struct sock *sk = sock->sk; 918 struct x25_sock *x25 = x25_sk(sk); 919 int rc = 0; 920 921 if (peer) { 922 if (sk->sk_state != TCP_ESTABLISHED) { 923 rc = -ENOTCONN; 924 goto out; 925 } 926 sx25->sx25_addr = x25->dest_addr; 927 } else 928 sx25->sx25_addr = x25->source_addr; 929 930 sx25->sx25_family = AF_X25; 931 rc = sizeof(*sx25); 932 933 out: 934 return rc; 935 } 936 937 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 938 unsigned int lci) 939 { 940 struct sock *sk; 941 struct sock *make; 942 struct x25_sock *makex25; 943 struct x25_address source_addr, dest_addr; 944 struct x25_facilities facilities; 945 struct x25_dte_facilities dte_facilities; 946 int len, addr_len, rc; 947 948 /* 949 * Remove the LCI and frame type. 950 */ 951 skb_pull(skb, X25_STD_MIN_LEN); 952 953 /* 954 * Extract the X.25 addresses and convert them to ASCII strings, 955 * and remove them. 956 * 957 * Address block is mandatory in call request packets 958 */ 959 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 960 if (addr_len <= 0) 961 goto out_clear_request; 962 skb_pull(skb, addr_len); 963 964 /* 965 * Get the length of the facilities, skip past them for the moment 966 * get the call user data because this is needed to determine 967 * the correct listener 968 * 969 * Facilities length is mandatory in call request packets 970 */ 971 if (!pskb_may_pull(skb, 1)) 972 goto out_clear_request; 973 len = skb->data[0] + 1; 974 if (!pskb_may_pull(skb, len)) 975 goto out_clear_request; 976 skb_pull(skb,len); 977 978 /* 979 * Ensure that the amount of call user data is valid. 980 */ 981 if (skb->len > X25_MAX_CUD_LEN) 982 goto out_clear_request; 983 984 /* 985 * Get all the call user data so it can be used in 986 * x25_find_listener and skb_copy_from_linear_data up ahead. 987 */ 988 if (!pskb_may_pull(skb, skb->len)) 989 goto out_clear_request; 990 991 /* 992 * Find a listener for the particular address/cud pair. 993 */ 994 sk = x25_find_listener(&source_addr,skb); 995 skb_push(skb,len); 996 997 if (sk != NULL && sk_acceptq_is_full(sk)) { 998 goto out_sock_put; 999 } 1000 1001 /* 1002 * We dont have any listeners for this incoming call. 1003 * Try forwarding it. 1004 */ 1005 if (sk == NULL) { 1006 skb_push(skb, addr_len + X25_STD_MIN_LEN); 1007 if (sysctl_x25_forward && 1008 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 1009 { 1010 /* Call was forwarded, dont process it any more */ 1011 kfree_skb(skb); 1012 rc = 1; 1013 goto out; 1014 } else { 1015 /* No listeners, can't forward, clear the call */ 1016 goto out_clear_request; 1017 } 1018 } 1019 1020 /* 1021 * Try to reach a compromise on the requested facilities. 1022 */ 1023 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1024 if (len == -1) 1025 goto out_sock_put; 1026 1027 /* 1028 * current neighbour/link might impose additional limits 1029 * on certain facilties 1030 */ 1031 1032 x25_limit_facilities(&facilities, nb); 1033 1034 /* 1035 * Try to create a new socket. 1036 */ 1037 make = x25_make_new(sk); 1038 if (!make) 1039 goto out_sock_put; 1040 1041 /* 1042 * Remove the facilities 1043 */ 1044 skb_pull(skb, len); 1045 1046 skb->sk = make; 1047 make->sk_state = TCP_ESTABLISHED; 1048 1049 makex25 = x25_sk(make); 1050 makex25->lci = lci; 1051 makex25->dest_addr = dest_addr; 1052 makex25->source_addr = source_addr; 1053 makex25->neighbour = nb; 1054 makex25->facilities = facilities; 1055 makex25->dte_facilities= dte_facilities; 1056 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1057 /* ensure no reverse facil on accept */ 1058 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1059 /* ensure no calling address extension on accept */ 1060 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1061 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1062 1063 /* Normally all calls are accepted immediately */ 1064 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1065 x25_write_internal(make, X25_CALL_ACCEPTED); 1066 makex25->state = X25_STATE_3; 1067 } else { 1068 makex25->state = X25_STATE_5; 1069 } 1070 1071 /* 1072 * Incoming Call User Data. 1073 */ 1074 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1075 makex25->calluserdata.cudlength = skb->len; 1076 1077 sk_acceptq_added(sk); 1078 1079 x25_insert_socket(make); 1080 1081 skb_queue_head(&sk->sk_receive_queue, skb); 1082 1083 x25_start_heartbeat(make); 1084 1085 if (!sock_flag(sk, SOCK_DEAD)) 1086 sk->sk_data_ready(sk); 1087 rc = 1; 1088 sock_put(sk); 1089 out: 1090 return rc; 1091 out_sock_put: 1092 sock_put(sk); 1093 out_clear_request: 1094 rc = 0; 1095 x25_transmit_clear_request(nb, lci, 0x01); 1096 goto out; 1097 } 1098 1099 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1100 { 1101 struct sock *sk = sock->sk; 1102 struct x25_sock *x25 = x25_sk(sk); 1103 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1104 struct sockaddr_x25 sx25; 1105 struct sk_buff *skb; 1106 unsigned char *asmptr; 1107 int noblock = msg->msg_flags & MSG_DONTWAIT; 1108 size_t size; 1109 int qbit = 0, rc = -EINVAL; 1110 1111 lock_sock(sk); 1112 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1113 goto out; 1114 1115 /* we currently don't support segmented records at the user interface */ 1116 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1117 goto out; 1118 1119 rc = -EADDRNOTAVAIL; 1120 if (sock_flag(sk, SOCK_ZAPPED)) 1121 goto out; 1122 1123 rc = -EPIPE; 1124 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1125 send_sig(SIGPIPE, current, 0); 1126 goto out; 1127 } 1128 1129 rc = -ENETUNREACH; 1130 if (!x25->neighbour) 1131 goto out; 1132 1133 if (usx25) { 1134 rc = -EINVAL; 1135 if (msg->msg_namelen < sizeof(sx25)) 1136 goto out; 1137 memcpy(&sx25, usx25, sizeof(sx25)); 1138 rc = -EISCONN; 1139 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1140 goto out; 1141 rc = -EINVAL; 1142 if (sx25.sx25_family != AF_X25) 1143 goto out; 1144 } else { 1145 /* 1146 * FIXME 1003.1g - if the socket is like this because 1147 * it has become closed (not started closed) we ought 1148 * to SIGPIPE, EPIPE; 1149 */ 1150 rc = -ENOTCONN; 1151 if (sk->sk_state != TCP_ESTABLISHED) 1152 goto out; 1153 1154 sx25.sx25_family = AF_X25; 1155 sx25.sx25_addr = x25->dest_addr; 1156 } 1157 1158 /* Sanity check the packet size */ 1159 if (len > 65535) { 1160 rc = -EMSGSIZE; 1161 goto out; 1162 } 1163 1164 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1165 1166 /* Build a packet */ 1167 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1168 1169 if ((msg->msg_flags & MSG_OOB) && len > 32) 1170 len = 32; 1171 1172 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1173 1174 release_sock(sk); 1175 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1176 lock_sock(sk); 1177 if (!skb) 1178 goto out; 1179 X25_SKB_CB(skb)->flags = msg->msg_flags; 1180 1181 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1182 1183 /* 1184 * Put the data on the end 1185 */ 1186 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1187 1188 skb_reset_transport_header(skb); 1189 skb_put(skb, len); 1190 1191 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1192 if (rc) 1193 goto out_kfree_skb; 1194 1195 /* 1196 * If the Q BIT Include socket option is in force, the first 1197 * byte of the user data is the logical value of the Q Bit. 1198 */ 1199 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1200 if (!pskb_may_pull(skb, 1)) 1201 goto out_kfree_skb; 1202 1203 qbit = skb->data[0]; 1204 skb_pull(skb, 1); 1205 } 1206 1207 /* 1208 * Push down the X.25 header 1209 */ 1210 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1211 1212 if (msg->msg_flags & MSG_OOB) { 1213 if (x25->neighbour->extended) { 1214 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1215 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1216 *asmptr++ = (x25->lci >> 0) & 0xFF; 1217 *asmptr++ = X25_INTERRUPT; 1218 } else { 1219 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1220 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1221 *asmptr++ = (x25->lci >> 0) & 0xFF; 1222 *asmptr++ = X25_INTERRUPT; 1223 } 1224 } else { 1225 if (x25->neighbour->extended) { 1226 /* Build an Extended X.25 header */ 1227 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1228 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1229 *asmptr++ = (x25->lci >> 0) & 0xFF; 1230 *asmptr++ = X25_DATA; 1231 *asmptr++ = X25_DATA; 1232 } else { 1233 /* Build an Standard X.25 header */ 1234 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1235 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1236 *asmptr++ = (x25->lci >> 0) & 0xFF; 1237 *asmptr++ = X25_DATA; 1238 } 1239 1240 if (qbit) 1241 skb->data[0] |= X25_Q_BIT; 1242 } 1243 1244 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1245 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1246 1247 rc = -ENOTCONN; 1248 if (sk->sk_state != TCP_ESTABLISHED) 1249 goto out_kfree_skb; 1250 1251 if (msg->msg_flags & MSG_OOB) 1252 skb_queue_tail(&x25->interrupt_out_queue, skb); 1253 else { 1254 rc = x25_output(sk, skb); 1255 len = rc; 1256 if (rc < 0) 1257 kfree_skb(skb); 1258 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1259 len++; 1260 } 1261 1262 x25_kick(sk); 1263 rc = len; 1264 out: 1265 release_sock(sk); 1266 return rc; 1267 out_kfree_skb: 1268 kfree_skb(skb); 1269 goto out; 1270 } 1271 1272 1273 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1274 int flags) 1275 { 1276 struct sock *sk = sock->sk; 1277 struct x25_sock *x25 = x25_sk(sk); 1278 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1279 size_t copied; 1280 int qbit, header_len; 1281 struct sk_buff *skb; 1282 unsigned char *asmptr; 1283 int rc = -ENOTCONN; 1284 1285 lock_sock(sk); 1286 1287 if (x25->neighbour == NULL) 1288 goto out; 1289 1290 header_len = x25->neighbour->extended ? 1291 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1292 1293 /* 1294 * This works for seqpacket too. The receiver has ordered the queue for 1295 * us! We do one quick check first though 1296 */ 1297 if (sk->sk_state != TCP_ESTABLISHED) 1298 goto out; 1299 1300 if (flags & MSG_OOB) { 1301 rc = -EINVAL; 1302 if (sock_flag(sk, SOCK_URGINLINE) || 1303 !skb_peek(&x25->interrupt_in_queue)) 1304 goto out; 1305 1306 skb = skb_dequeue(&x25->interrupt_in_queue); 1307 1308 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1309 goto out_free_dgram; 1310 1311 skb_pull(skb, X25_STD_MIN_LEN); 1312 1313 /* 1314 * No Q bit information on Interrupt data. 1315 */ 1316 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1317 asmptr = skb_push(skb, 1); 1318 *asmptr = 0x00; 1319 } 1320 1321 msg->msg_flags |= MSG_OOB; 1322 } else { 1323 /* Now we can treat all alike */ 1324 release_sock(sk); 1325 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1326 flags & MSG_DONTWAIT, &rc); 1327 lock_sock(sk); 1328 if (!skb) 1329 goto out; 1330 1331 if (!pskb_may_pull(skb, header_len)) 1332 goto out_free_dgram; 1333 1334 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1335 1336 skb_pull(skb, header_len); 1337 1338 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1339 asmptr = skb_push(skb, 1); 1340 *asmptr = qbit; 1341 } 1342 } 1343 1344 skb_reset_transport_header(skb); 1345 copied = skb->len; 1346 1347 if (copied > size) { 1348 copied = size; 1349 msg->msg_flags |= MSG_TRUNC; 1350 } 1351 1352 /* Currently, each datagram always contains a complete record */ 1353 msg->msg_flags |= MSG_EOR; 1354 1355 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1356 if (rc) 1357 goto out_free_dgram; 1358 1359 if (sx25) { 1360 sx25->sx25_family = AF_X25; 1361 sx25->sx25_addr = x25->dest_addr; 1362 msg->msg_namelen = sizeof(*sx25); 1363 } 1364 1365 x25_check_rbuf(sk); 1366 rc = copied; 1367 out_free_dgram: 1368 skb_free_datagram(sk, skb); 1369 out: 1370 release_sock(sk); 1371 return rc; 1372 } 1373 1374 1375 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1376 { 1377 struct sock *sk = sock->sk; 1378 struct x25_sock *x25 = x25_sk(sk); 1379 void __user *argp = (void __user *)arg; 1380 int rc; 1381 1382 switch (cmd) { 1383 case TIOCOUTQ: { 1384 int amount; 1385 1386 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1387 if (amount < 0) 1388 amount = 0; 1389 rc = put_user(amount, (unsigned int __user *)argp); 1390 break; 1391 } 1392 1393 case TIOCINQ: { 1394 struct sk_buff *skb; 1395 int amount = 0; 1396 /* 1397 * These two are safe on a single CPU system as 1398 * only user tasks fiddle here 1399 */ 1400 lock_sock(sk); 1401 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1402 amount = skb->len; 1403 release_sock(sk); 1404 rc = put_user(amount, (unsigned int __user *)argp); 1405 break; 1406 } 1407 1408 case SIOCGIFADDR: 1409 case SIOCSIFADDR: 1410 case SIOCGIFDSTADDR: 1411 case SIOCSIFDSTADDR: 1412 case SIOCGIFBRDADDR: 1413 case SIOCSIFBRDADDR: 1414 case SIOCGIFNETMASK: 1415 case SIOCSIFNETMASK: 1416 case SIOCGIFMETRIC: 1417 case SIOCSIFMETRIC: 1418 rc = -EINVAL; 1419 break; 1420 case SIOCADDRT: 1421 case SIOCDELRT: 1422 rc = -EPERM; 1423 if (!capable(CAP_NET_ADMIN)) 1424 break; 1425 rc = x25_route_ioctl(cmd, argp); 1426 break; 1427 case SIOCX25GSUBSCRIP: 1428 rc = x25_subscr_ioctl(cmd, argp); 1429 break; 1430 case SIOCX25SSUBSCRIP: 1431 rc = -EPERM; 1432 if (!capable(CAP_NET_ADMIN)) 1433 break; 1434 rc = x25_subscr_ioctl(cmd, argp); 1435 break; 1436 case SIOCX25GFACILITIES: { 1437 lock_sock(sk); 1438 rc = copy_to_user(argp, &x25->facilities, 1439 sizeof(x25->facilities)) 1440 ? -EFAULT : 0; 1441 release_sock(sk); 1442 break; 1443 } 1444 1445 case SIOCX25SFACILITIES: { 1446 struct x25_facilities facilities; 1447 rc = -EFAULT; 1448 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1449 break; 1450 rc = -EINVAL; 1451 lock_sock(sk); 1452 if (sk->sk_state != TCP_LISTEN && 1453 sk->sk_state != TCP_CLOSE) 1454 goto out_fac_release; 1455 if (facilities.pacsize_in < X25_PS16 || 1456 facilities.pacsize_in > X25_PS4096) 1457 goto out_fac_release; 1458 if (facilities.pacsize_out < X25_PS16 || 1459 facilities.pacsize_out > X25_PS4096) 1460 goto out_fac_release; 1461 if (facilities.winsize_in < 1 || 1462 facilities.winsize_in > 127) 1463 goto out_fac_release; 1464 if (facilities.throughput) { 1465 int out = facilities.throughput & 0xf0; 1466 int in = facilities.throughput & 0x0f; 1467 if (!out) 1468 facilities.throughput |= 1469 X25_DEFAULT_THROUGHPUT << 4; 1470 else if (out < 0x30 || out > 0xD0) 1471 goto out_fac_release; 1472 if (!in) 1473 facilities.throughput |= 1474 X25_DEFAULT_THROUGHPUT; 1475 else if (in < 0x03 || in > 0x0D) 1476 goto out_fac_release; 1477 } 1478 if (facilities.reverse && 1479 (facilities.reverse & 0x81) != 0x81) 1480 goto out_fac_release; 1481 x25->facilities = facilities; 1482 rc = 0; 1483 out_fac_release: 1484 release_sock(sk); 1485 break; 1486 } 1487 1488 case SIOCX25GDTEFACILITIES: { 1489 lock_sock(sk); 1490 rc = copy_to_user(argp, &x25->dte_facilities, 1491 sizeof(x25->dte_facilities)); 1492 release_sock(sk); 1493 if (rc) 1494 rc = -EFAULT; 1495 break; 1496 } 1497 1498 case SIOCX25SDTEFACILITIES: { 1499 struct x25_dte_facilities dtefacs; 1500 rc = -EFAULT; 1501 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1502 break; 1503 rc = -EINVAL; 1504 lock_sock(sk); 1505 if (sk->sk_state != TCP_LISTEN && 1506 sk->sk_state != TCP_CLOSE) 1507 goto out_dtefac_release; 1508 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1509 goto out_dtefac_release; 1510 if (dtefacs.called_len > X25_MAX_AE_LEN) 1511 goto out_dtefac_release; 1512 x25->dte_facilities = dtefacs; 1513 rc = 0; 1514 out_dtefac_release: 1515 release_sock(sk); 1516 break; 1517 } 1518 1519 case SIOCX25GCALLUSERDATA: { 1520 lock_sock(sk); 1521 rc = copy_to_user(argp, &x25->calluserdata, 1522 sizeof(x25->calluserdata)) 1523 ? -EFAULT : 0; 1524 release_sock(sk); 1525 break; 1526 } 1527 1528 case SIOCX25SCALLUSERDATA: { 1529 struct x25_calluserdata calluserdata; 1530 1531 rc = -EFAULT; 1532 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1533 break; 1534 rc = -EINVAL; 1535 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1536 break; 1537 lock_sock(sk); 1538 x25->calluserdata = calluserdata; 1539 release_sock(sk); 1540 rc = 0; 1541 break; 1542 } 1543 1544 case SIOCX25GCAUSEDIAG: { 1545 lock_sock(sk); 1546 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1547 ? -EFAULT : 0; 1548 release_sock(sk); 1549 break; 1550 } 1551 1552 case SIOCX25SCAUSEDIAG: { 1553 struct x25_causediag causediag; 1554 rc = -EFAULT; 1555 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1556 break; 1557 lock_sock(sk); 1558 x25->causediag = causediag; 1559 release_sock(sk); 1560 rc = 0; 1561 break; 1562 1563 } 1564 1565 case SIOCX25SCUDMATCHLEN: { 1566 struct x25_subaddr sub_addr; 1567 rc = -EINVAL; 1568 lock_sock(sk); 1569 if(sk->sk_state != TCP_CLOSE) 1570 goto out_cud_release; 1571 rc = -EFAULT; 1572 if (copy_from_user(&sub_addr, argp, 1573 sizeof(sub_addr))) 1574 goto out_cud_release; 1575 rc = -EINVAL; 1576 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1577 goto out_cud_release; 1578 x25->cudmatchlength = sub_addr.cudmatchlength; 1579 rc = 0; 1580 out_cud_release: 1581 release_sock(sk); 1582 break; 1583 } 1584 1585 case SIOCX25CALLACCPTAPPRV: { 1586 rc = -EINVAL; 1587 lock_sock(sk); 1588 if (sk->sk_state == TCP_CLOSE) { 1589 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1590 rc = 0; 1591 } 1592 release_sock(sk); 1593 break; 1594 } 1595 1596 case SIOCX25SENDCALLACCPT: { 1597 rc = -EINVAL; 1598 lock_sock(sk); 1599 if (sk->sk_state != TCP_ESTABLISHED) 1600 goto out_sendcallaccpt_release; 1601 /* must call accptapprv above */ 1602 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1603 goto out_sendcallaccpt_release; 1604 x25_write_internal(sk, X25_CALL_ACCEPTED); 1605 x25->state = X25_STATE_3; 1606 rc = 0; 1607 out_sendcallaccpt_release: 1608 release_sock(sk); 1609 break; 1610 } 1611 1612 default: 1613 rc = -ENOIOCTLCMD; 1614 break; 1615 } 1616 1617 return rc; 1618 } 1619 1620 static const struct net_proto_family x25_family_ops = { 1621 .family = AF_X25, 1622 .create = x25_create, 1623 .owner = THIS_MODULE, 1624 }; 1625 1626 #ifdef CONFIG_COMPAT 1627 static int compat_x25_subscr_ioctl(unsigned int cmd, 1628 struct compat_x25_subscrip_struct __user *x25_subscr32) 1629 { 1630 struct compat_x25_subscrip_struct x25_subscr; 1631 struct x25_neigh *nb; 1632 struct net_device *dev; 1633 int rc = -EINVAL; 1634 1635 rc = -EFAULT; 1636 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1637 goto out; 1638 1639 rc = -EINVAL; 1640 dev = x25_dev_get(x25_subscr.device); 1641 if (dev == NULL) 1642 goto out; 1643 1644 nb = x25_get_neigh(dev); 1645 if (nb == NULL) 1646 goto out_dev_put; 1647 1648 dev_put(dev); 1649 1650 if (cmd == SIOCX25GSUBSCRIP) { 1651 read_lock_bh(&x25_neigh_list_lock); 1652 x25_subscr.extended = nb->extended; 1653 x25_subscr.global_facil_mask = nb->global_facil_mask; 1654 read_unlock_bh(&x25_neigh_list_lock); 1655 rc = copy_to_user(x25_subscr32, &x25_subscr, 1656 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1657 } else { 1658 rc = -EINVAL; 1659 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1660 rc = 0; 1661 write_lock_bh(&x25_neigh_list_lock); 1662 nb->extended = x25_subscr.extended; 1663 nb->global_facil_mask = x25_subscr.global_facil_mask; 1664 write_unlock_bh(&x25_neigh_list_lock); 1665 } 1666 } 1667 x25_neigh_put(nb); 1668 out: 1669 return rc; 1670 out_dev_put: 1671 dev_put(dev); 1672 goto out; 1673 } 1674 1675 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1676 unsigned long arg) 1677 { 1678 void __user *argp = compat_ptr(arg); 1679 int rc = -ENOIOCTLCMD; 1680 1681 switch(cmd) { 1682 case TIOCOUTQ: 1683 case TIOCINQ: 1684 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1685 break; 1686 case SIOCGIFADDR: 1687 case SIOCSIFADDR: 1688 case SIOCGIFDSTADDR: 1689 case SIOCSIFDSTADDR: 1690 case SIOCGIFBRDADDR: 1691 case SIOCSIFBRDADDR: 1692 case SIOCGIFNETMASK: 1693 case SIOCSIFNETMASK: 1694 case SIOCGIFMETRIC: 1695 case SIOCSIFMETRIC: 1696 rc = -EINVAL; 1697 break; 1698 case SIOCADDRT: 1699 case SIOCDELRT: 1700 rc = -EPERM; 1701 if (!capable(CAP_NET_ADMIN)) 1702 break; 1703 rc = x25_route_ioctl(cmd, argp); 1704 break; 1705 case SIOCX25GSUBSCRIP: 1706 rc = compat_x25_subscr_ioctl(cmd, argp); 1707 break; 1708 case SIOCX25SSUBSCRIP: 1709 rc = -EPERM; 1710 if (!capable(CAP_NET_ADMIN)) 1711 break; 1712 rc = compat_x25_subscr_ioctl(cmd, argp); 1713 break; 1714 case SIOCX25GFACILITIES: 1715 case SIOCX25SFACILITIES: 1716 case SIOCX25GDTEFACILITIES: 1717 case SIOCX25SDTEFACILITIES: 1718 case SIOCX25GCALLUSERDATA: 1719 case SIOCX25SCALLUSERDATA: 1720 case SIOCX25GCAUSEDIAG: 1721 case SIOCX25SCAUSEDIAG: 1722 case SIOCX25SCUDMATCHLEN: 1723 case SIOCX25CALLACCPTAPPRV: 1724 case SIOCX25SENDCALLACCPT: 1725 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1726 break; 1727 default: 1728 rc = -ENOIOCTLCMD; 1729 break; 1730 } 1731 return rc; 1732 } 1733 #endif 1734 1735 static const struct proto_ops x25_proto_ops = { 1736 .family = AF_X25, 1737 .owner = THIS_MODULE, 1738 .release = x25_release, 1739 .bind = x25_bind, 1740 .connect = x25_connect, 1741 .socketpair = sock_no_socketpair, 1742 .accept = x25_accept, 1743 .getname = x25_getname, 1744 .poll = datagram_poll, 1745 .ioctl = x25_ioctl, 1746 #ifdef CONFIG_COMPAT 1747 .compat_ioctl = compat_x25_ioctl, 1748 #endif 1749 .gettstamp = sock_gettstamp, 1750 .listen = x25_listen, 1751 .shutdown = sock_no_shutdown, 1752 .setsockopt = x25_setsockopt, 1753 .getsockopt = x25_getsockopt, 1754 .sendmsg = x25_sendmsg, 1755 .recvmsg = x25_recvmsg, 1756 .mmap = sock_no_mmap, 1757 .sendpage = sock_no_sendpage, 1758 }; 1759 1760 static struct packet_type x25_packet_type __read_mostly = { 1761 .type = cpu_to_be16(ETH_P_X25), 1762 .func = x25_lapb_receive_frame, 1763 }; 1764 1765 static struct notifier_block x25_dev_notifier = { 1766 .notifier_call = x25_device_event, 1767 }; 1768 1769 void x25_kill_by_neigh(struct x25_neigh *nb) 1770 { 1771 struct sock *s; 1772 1773 write_lock_bh(&x25_list_lock); 1774 1775 sk_for_each(s, &x25_list) 1776 if (x25_sk(s)->neighbour == nb) 1777 x25_disconnect(s, ENETUNREACH, 0, 0); 1778 1779 write_unlock_bh(&x25_list_lock); 1780 1781 /* Remove any related forwards */ 1782 x25_clear_forward_by_dev(nb->dev); 1783 } 1784 1785 static int __init x25_init(void) 1786 { 1787 int rc; 1788 1789 rc = proto_register(&x25_proto, 0); 1790 if (rc) 1791 goto out; 1792 1793 rc = sock_register(&x25_family_ops); 1794 if (rc) 1795 goto out_proto; 1796 1797 dev_add_pack(&x25_packet_type); 1798 1799 rc = register_netdevice_notifier(&x25_dev_notifier); 1800 if (rc) 1801 goto out_sock; 1802 1803 rc = x25_register_sysctl(); 1804 if (rc) 1805 goto out_dev; 1806 1807 rc = x25_proc_init(); 1808 if (rc) 1809 goto out_sysctl; 1810 1811 pr_info("Linux Version 0.2\n"); 1812 1813 out: 1814 return rc; 1815 out_sysctl: 1816 x25_unregister_sysctl(); 1817 out_dev: 1818 unregister_netdevice_notifier(&x25_dev_notifier); 1819 out_sock: 1820 dev_remove_pack(&x25_packet_type); 1821 sock_unregister(AF_X25); 1822 out_proto: 1823 proto_unregister(&x25_proto); 1824 goto out; 1825 } 1826 module_init(x25_init); 1827 1828 static void __exit x25_exit(void) 1829 { 1830 x25_proc_exit(); 1831 x25_link_free(); 1832 x25_route_free(); 1833 1834 x25_unregister_sysctl(); 1835 1836 unregister_netdevice_notifier(&x25_dev_notifier); 1837 1838 dev_remove_pack(&x25_packet_type); 1839 1840 sock_unregister(AF_X25); 1841 proto_unregister(&x25_proto); 1842 } 1843 module_exit(x25_exit); 1844 1845 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1846 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1847 MODULE_LICENSE("GPL"); 1848 MODULE_ALIAS_NETPROTO(PF_X25); 1849