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 * Handle device status changes. 204 */ 205 static int x25_device_event(struct notifier_block *this, unsigned long event, 206 void *ptr) 207 { 208 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 209 struct x25_neigh *nb; 210 211 if (!net_eq(dev_net(dev), &init_net)) 212 return NOTIFY_DONE; 213 214 if (dev->type == ARPHRD_X25) { 215 switch (event) { 216 case NETDEV_REGISTER: 217 case NETDEV_POST_TYPE_CHANGE: 218 x25_link_device_up(dev); 219 break; 220 case NETDEV_DOWN: 221 nb = x25_get_neigh(dev); 222 if (nb) { 223 x25_link_terminated(nb); 224 x25_neigh_put(nb); 225 } 226 x25_route_device_down(dev); 227 break; 228 case NETDEV_PRE_TYPE_CHANGE: 229 case NETDEV_UNREGISTER: 230 x25_link_device_down(dev); 231 break; 232 case NETDEV_CHANGE: 233 if (!netif_carrier_ok(dev)) { 234 nb = x25_get_neigh(dev); 235 if (nb) { 236 x25_link_terminated(nb); 237 x25_neigh_put(nb); 238 } 239 } 240 break; 241 } 242 } 243 244 return NOTIFY_DONE; 245 } 246 247 /* 248 * Add a socket to the bound sockets list. 249 */ 250 static void x25_insert_socket(struct sock *sk) 251 { 252 write_lock_bh(&x25_list_lock); 253 sk_add_node(sk, &x25_list); 254 write_unlock_bh(&x25_list_lock); 255 } 256 257 /* 258 * Find a socket that wants to accept the Call Request we just 259 * received. Check the full list for an address/cud match. 260 * If no cuds match return the next_best thing, an address match. 261 * Note: if a listening socket has cud set it must only get calls 262 * with matching cud. 263 */ 264 static struct sock *x25_find_listener(struct x25_address *addr, 265 struct sk_buff *skb) 266 { 267 struct sock *s; 268 struct sock *next_best; 269 270 read_lock_bh(&x25_list_lock); 271 next_best = NULL; 272 273 sk_for_each(s, &x25_list) 274 if ((!strcmp(addr->x25_addr, 275 x25_sk(s)->source_addr.x25_addr) || 276 !strcmp(x25_sk(s)->source_addr.x25_addr, 277 null_x25_address.x25_addr)) && 278 s->sk_state == TCP_LISTEN) { 279 /* 280 * Found a listening socket, now check the incoming 281 * call user data vs this sockets call user data 282 */ 283 if (x25_sk(s)->cudmatchlength > 0 && 284 skb->len >= x25_sk(s)->cudmatchlength) { 285 if((memcmp(x25_sk(s)->calluserdata.cuddata, 286 skb->data, 287 x25_sk(s)->cudmatchlength)) == 0) { 288 sock_hold(s); 289 goto found; 290 } 291 } else 292 next_best = s; 293 } 294 if (next_best) { 295 s = next_best; 296 sock_hold(s); 297 goto found; 298 } 299 s = NULL; 300 found: 301 read_unlock_bh(&x25_list_lock); 302 return s; 303 } 304 305 /* 306 * Find a connected X.25 socket given my LCI and neighbour. 307 */ 308 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 309 { 310 struct sock *s; 311 312 sk_for_each(s, &x25_list) 313 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 314 sock_hold(s); 315 goto found; 316 } 317 s = NULL; 318 found: 319 return s; 320 } 321 322 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 323 { 324 struct sock *s; 325 326 read_lock_bh(&x25_list_lock); 327 s = __x25_find_socket(lci, nb); 328 read_unlock_bh(&x25_list_lock); 329 return s; 330 } 331 332 /* 333 * Find a unique LCI for a given device. 334 */ 335 static unsigned int x25_new_lci(struct x25_neigh *nb) 336 { 337 unsigned int lci = 1; 338 struct sock *sk; 339 340 while ((sk = x25_find_socket(lci, nb)) != NULL) { 341 sock_put(sk); 342 if (++lci == 4096) { 343 lci = 0; 344 break; 345 } 346 cond_resched(); 347 } 348 349 return lci; 350 } 351 352 /* 353 * Deferred destroy. 354 */ 355 static void __x25_destroy_socket(struct sock *); 356 357 /* 358 * handler for deferred kills. 359 */ 360 static void x25_destroy_timer(struct timer_list *t) 361 { 362 struct sock *sk = from_timer(sk, t, sk_timer); 363 364 x25_destroy_socket_from_timer(sk); 365 } 366 367 /* 368 * This is called from user mode and the timers. Thus it protects itself 369 * against interrupting users but doesn't worry about being called during 370 * work. Once it is removed from the queue no interrupt or bottom half 371 * will touch it and we are (fairly 8-) ) safe. 372 * Not static as it's used by the timer 373 */ 374 static void __x25_destroy_socket(struct sock *sk) 375 { 376 struct sk_buff *skb; 377 378 x25_stop_heartbeat(sk); 379 x25_stop_timer(sk); 380 381 x25_remove_socket(sk); 382 x25_clear_queues(sk); /* Flush the queues */ 383 384 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 385 if (skb->sk != sk) { /* A pending connection */ 386 /* 387 * Queue the unaccepted socket for death 388 */ 389 skb->sk->sk_state = TCP_LISTEN; 390 sock_set_flag(skb->sk, SOCK_DEAD); 391 x25_start_heartbeat(skb->sk); 392 x25_sk(skb->sk)->state = X25_STATE_0; 393 } 394 395 kfree_skb(skb); 396 } 397 398 if (sk_has_allocations(sk)) { 399 /* Defer: outstanding buffers */ 400 sk->sk_timer.expires = jiffies + 10 * HZ; 401 sk->sk_timer.function = x25_destroy_timer; 402 add_timer(&sk->sk_timer); 403 } else { 404 /* drop last reference so sock_put will free */ 405 __sock_put(sk); 406 } 407 } 408 409 void x25_destroy_socket_from_timer(struct sock *sk) 410 { 411 sock_hold(sk); 412 bh_lock_sock(sk); 413 __x25_destroy_socket(sk); 414 bh_unlock_sock(sk); 415 sock_put(sk); 416 } 417 418 /* 419 * Handling for system calls applied via the various interfaces to a 420 * X.25 socket object. 421 */ 422 423 static int x25_setsockopt(struct socket *sock, int level, int optname, 424 sockptr_t optval, unsigned int optlen) 425 { 426 int opt; 427 struct sock *sk = sock->sk; 428 int rc = -ENOPROTOOPT; 429 430 if (level != SOL_X25 || optname != X25_QBITINCL) 431 goto out; 432 433 rc = -EINVAL; 434 if (optlen < sizeof(int)) 435 goto out; 436 437 rc = -EFAULT; 438 if (copy_from_sockptr(&opt, optval, sizeof(int))) 439 goto out; 440 441 if (opt) 442 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 443 else 444 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 445 rc = 0; 446 out: 447 return rc; 448 } 449 450 static int x25_getsockopt(struct socket *sock, int level, int optname, 451 char __user *optval, int __user *optlen) 452 { 453 struct sock *sk = sock->sk; 454 int val, len, rc = -ENOPROTOOPT; 455 456 if (level != SOL_X25 || optname != X25_QBITINCL) 457 goto out; 458 459 rc = -EFAULT; 460 if (get_user(len, optlen)) 461 goto out; 462 463 len = min_t(unsigned int, len, sizeof(int)); 464 465 rc = -EINVAL; 466 if (len < 0) 467 goto out; 468 469 rc = -EFAULT; 470 if (put_user(len, optlen)) 471 goto out; 472 473 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 474 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 475 out: 476 return rc; 477 } 478 479 static int x25_listen(struct socket *sock, int backlog) 480 { 481 struct sock *sk = sock->sk; 482 int rc = -EOPNOTSUPP; 483 484 lock_sock(sk); 485 if (sk->sk_state != TCP_LISTEN) { 486 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 487 sk->sk_max_ack_backlog = backlog; 488 sk->sk_state = TCP_LISTEN; 489 rc = 0; 490 } 491 release_sock(sk); 492 493 return rc; 494 } 495 496 static struct proto x25_proto = { 497 .name = "X25", 498 .owner = THIS_MODULE, 499 .obj_size = sizeof(struct x25_sock), 500 }; 501 502 static struct sock *x25_alloc_socket(struct net *net, int kern) 503 { 504 struct x25_sock *x25; 505 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 506 507 if (!sk) 508 goto out; 509 510 sock_init_data(NULL, sk); 511 512 x25 = x25_sk(sk); 513 skb_queue_head_init(&x25->ack_queue); 514 skb_queue_head_init(&x25->fragment_queue); 515 skb_queue_head_init(&x25->interrupt_in_queue); 516 skb_queue_head_init(&x25->interrupt_out_queue); 517 out: 518 return sk; 519 } 520 521 static int x25_create(struct net *net, struct socket *sock, int protocol, 522 int kern) 523 { 524 struct sock *sk; 525 struct x25_sock *x25; 526 int rc = -EAFNOSUPPORT; 527 528 if (!net_eq(net, &init_net)) 529 goto out; 530 531 rc = -ESOCKTNOSUPPORT; 532 if (sock->type != SOCK_SEQPACKET) 533 goto out; 534 535 rc = -EINVAL; 536 if (protocol) 537 goto out; 538 539 rc = -ENOMEM; 540 if ((sk = x25_alloc_socket(net, kern)) == NULL) 541 goto out; 542 543 x25 = x25_sk(sk); 544 545 sock_init_data(sock, sk); 546 547 x25_init_timers(sk); 548 549 sock->ops = &x25_proto_ops; 550 sk->sk_protocol = protocol; 551 sk->sk_backlog_rcv = x25_backlog_rcv; 552 553 x25->t21 = sysctl_x25_call_request_timeout; 554 x25->t22 = sysctl_x25_reset_request_timeout; 555 x25->t23 = sysctl_x25_clear_request_timeout; 556 x25->t2 = sysctl_x25_ack_holdback_timeout; 557 x25->state = X25_STATE_0; 558 x25->cudmatchlength = 0; 559 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 560 /* on call accept */ 561 562 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 563 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 564 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 565 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 566 x25->facilities.throughput = 0; /* by default don't negotiate 567 throughput */ 568 x25->facilities.reverse = X25_DEFAULT_REVERSE; 569 x25->dte_facilities.calling_len = 0; 570 x25->dte_facilities.called_len = 0; 571 memset(x25->dte_facilities.called_ae, '\0', 572 sizeof(x25->dte_facilities.called_ae)); 573 memset(x25->dte_facilities.calling_ae, '\0', 574 sizeof(x25->dte_facilities.calling_ae)); 575 576 rc = 0; 577 out: 578 return rc; 579 } 580 581 static struct sock *x25_make_new(struct sock *osk) 582 { 583 struct sock *sk = NULL; 584 struct x25_sock *x25, *ox25; 585 586 if (osk->sk_type != SOCK_SEQPACKET) 587 goto out; 588 589 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 590 goto out; 591 592 x25 = x25_sk(sk); 593 594 sk->sk_type = osk->sk_type; 595 sk->sk_priority = osk->sk_priority; 596 sk->sk_protocol = osk->sk_protocol; 597 sk->sk_rcvbuf = osk->sk_rcvbuf; 598 sk->sk_sndbuf = osk->sk_sndbuf; 599 sk->sk_state = TCP_ESTABLISHED; 600 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 601 sock_copy_flags(sk, osk); 602 603 ox25 = x25_sk(osk); 604 x25->t21 = ox25->t21; 605 x25->t22 = ox25->t22; 606 x25->t23 = ox25->t23; 607 x25->t2 = ox25->t2; 608 x25->flags = ox25->flags; 609 x25->facilities = ox25->facilities; 610 x25->dte_facilities = ox25->dte_facilities; 611 x25->cudmatchlength = ox25->cudmatchlength; 612 613 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 614 x25_init_timers(sk); 615 out: 616 return sk; 617 } 618 619 static int x25_release(struct socket *sock) 620 { 621 struct sock *sk = sock->sk; 622 struct x25_sock *x25; 623 624 if (!sk) 625 return 0; 626 627 x25 = x25_sk(sk); 628 629 sock_hold(sk); 630 lock_sock(sk); 631 switch (x25->state) { 632 633 case X25_STATE_0: 634 case X25_STATE_2: 635 x25_disconnect(sk, 0, 0, 0); 636 __x25_destroy_socket(sk); 637 goto out; 638 639 case X25_STATE_1: 640 case X25_STATE_3: 641 case X25_STATE_4: 642 x25_clear_queues(sk); 643 x25_write_internal(sk, X25_CLEAR_REQUEST); 644 x25_start_t23timer(sk); 645 x25->state = X25_STATE_2; 646 sk->sk_state = TCP_CLOSE; 647 sk->sk_shutdown |= SEND_SHUTDOWN; 648 sk->sk_state_change(sk); 649 sock_set_flag(sk, SOCK_DEAD); 650 sock_set_flag(sk, SOCK_DESTROY); 651 break; 652 653 case X25_STATE_5: 654 x25_write_internal(sk, X25_CLEAR_REQUEST); 655 x25_disconnect(sk, 0, 0, 0); 656 __x25_destroy_socket(sk); 657 goto out; 658 } 659 660 sock_orphan(sk); 661 out: 662 release_sock(sk); 663 sock_put(sk); 664 return 0; 665 } 666 667 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 668 { 669 struct sock *sk = sock->sk; 670 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 671 int len, i, rc = 0; 672 673 if (addr_len != sizeof(struct sockaddr_x25) || 674 addr->sx25_family != AF_X25 || 675 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) { 676 rc = -EINVAL; 677 goto out; 678 } 679 680 /* check for the null_x25_address */ 681 if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) { 682 683 len = strlen(addr->sx25_addr.x25_addr); 684 for (i = 0; i < len; i++) { 685 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 686 rc = -EINVAL; 687 goto out; 688 } 689 } 690 } 691 692 lock_sock(sk); 693 if (sock_flag(sk, SOCK_ZAPPED)) { 694 x25_sk(sk)->source_addr = addr->sx25_addr; 695 x25_insert_socket(sk); 696 sock_reset_flag(sk, SOCK_ZAPPED); 697 } else { 698 rc = -EINVAL; 699 } 700 release_sock(sk); 701 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 702 out: 703 return rc; 704 } 705 706 static int x25_wait_for_connection_establishment(struct sock *sk) 707 { 708 DECLARE_WAITQUEUE(wait, current); 709 int rc; 710 711 add_wait_queue_exclusive(sk_sleep(sk), &wait); 712 for (;;) { 713 __set_current_state(TASK_INTERRUPTIBLE); 714 rc = -ERESTARTSYS; 715 if (signal_pending(current)) 716 break; 717 rc = sock_error(sk); 718 if (rc) { 719 sk->sk_socket->state = SS_UNCONNECTED; 720 break; 721 } 722 rc = -ENOTCONN; 723 if (sk->sk_state == TCP_CLOSE) { 724 sk->sk_socket->state = SS_UNCONNECTED; 725 break; 726 } 727 rc = 0; 728 if (sk->sk_state != TCP_ESTABLISHED) { 729 release_sock(sk); 730 schedule(); 731 lock_sock(sk); 732 } else 733 break; 734 } 735 __set_current_state(TASK_RUNNING); 736 remove_wait_queue(sk_sleep(sk), &wait); 737 return rc; 738 } 739 740 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 741 int addr_len, int flags) 742 { 743 struct sock *sk = sock->sk; 744 struct x25_sock *x25 = x25_sk(sk); 745 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 746 struct x25_route *rt; 747 int rc = 0; 748 749 lock_sock(sk); 750 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 751 sock->state = SS_CONNECTED; 752 goto out; /* Connect completed during a ERESTARTSYS event */ 753 } 754 755 rc = -ECONNREFUSED; 756 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 757 sock->state = SS_UNCONNECTED; 758 goto out; 759 } 760 761 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 762 if (sk->sk_state == TCP_ESTABLISHED) 763 goto out; 764 765 rc = -EALREADY; /* Do nothing if call is already in progress */ 766 if (sk->sk_state == TCP_SYN_SENT) 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 strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) 776 goto out; 777 778 rc = -ENETUNREACH; 779 rt = x25_get_route(&addr->sx25_addr); 780 if (!rt) 781 goto out; 782 783 x25->neighbour = x25_get_neigh(rt->dev); 784 if (!x25->neighbour) 785 goto out_put_route; 786 787 x25_limit_facilities(&x25->facilities, x25->neighbour); 788 789 x25->lci = x25_new_lci(x25->neighbour); 790 if (!x25->lci) 791 goto out_put_neigh; 792 793 rc = -EINVAL; 794 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 795 goto out_put_neigh; 796 797 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 798 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 799 800 x25->dest_addr = addr->sx25_addr; 801 802 /* Move to connecting socket, start sending Connect Requests */ 803 sock->state = SS_CONNECTING; 804 sk->sk_state = TCP_SYN_SENT; 805 806 x25->state = X25_STATE_1; 807 808 x25_write_internal(sk, X25_CALL_REQUEST); 809 810 x25_start_heartbeat(sk); 811 x25_start_t21timer(sk); 812 813 /* Now the loop */ 814 rc = -EINPROGRESS; 815 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 816 goto out; 817 818 rc = x25_wait_for_connection_establishment(sk); 819 if (rc) 820 goto out_put_neigh; 821 822 sock->state = SS_CONNECTED; 823 rc = 0; 824 out_put_neigh: 825 if (rc && x25->neighbour) { 826 read_lock_bh(&x25_list_lock); 827 x25_neigh_put(x25->neighbour); 828 x25->neighbour = NULL; 829 read_unlock_bh(&x25_list_lock); 830 x25->state = X25_STATE_0; 831 } 832 out_put_route: 833 x25_route_put(rt); 834 out: 835 release_sock(sk); 836 return rc; 837 } 838 839 static int x25_wait_for_data(struct sock *sk, long timeout) 840 { 841 DECLARE_WAITQUEUE(wait, current); 842 int rc = 0; 843 844 add_wait_queue_exclusive(sk_sleep(sk), &wait); 845 for (;;) { 846 __set_current_state(TASK_INTERRUPTIBLE); 847 if (sk->sk_shutdown & RCV_SHUTDOWN) 848 break; 849 rc = -ERESTARTSYS; 850 if (signal_pending(current)) 851 break; 852 rc = -EAGAIN; 853 if (!timeout) 854 break; 855 rc = 0; 856 if (skb_queue_empty(&sk->sk_receive_queue)) { 857 release_sock(sk); 858 timeout = schedule_timeout(timeout); 859 lock_sock(sk); 860 } else 861 break; 862 } 863 __set_current_state(TASK_RUNNING); 864 remove_wait_queue(sk_sleep(sk), &wait); 865 return rc; 866 } 867 868 static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 869 bool kern) 870 { 871 struct sock *sk = sock->sk; 872 struct sock *newsk; 873 struct sk_buff *skb; 874 int rc = -EINVAL; 875 876 if (!sk) 877 goto out; 878 879 rc = -EOPNOTSUPP; 880 if (sk->sk_type != SOCK_SEQPACKET) 881 goto out; 882 883 lock_sock(sk); 884 rc = -EINVAL; 885 if (sk->sk_state != TCP_LISTEN) 886 goto out2; 887 888 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 889 if (rc) 890 goto out2; 891 skb = skb_dequeue(&sk->sk_receive_queue); 892 rc = -EINVAL; 893 if (!skb->sk) 894 goto out2; 895 newsk = skb->sk; 896 sock_graft(newsk, newsock); 897 898 /* Now attach up the new socket */ 899 skb->sk = NULL; 900 kfree_skb(skb); 901 sk_acceptq_removed(sk); 902 newsock->state = SS_CONNECTED; 903 rc = 0; 904 out2: 905 release_sock(sk); 906 out: 907 return rc; 908 } 909 910 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 911 int peer) 912 { 913 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 914 struct sock *sk = sock->sk; 915 struct x25_sock *x25 = x25_sk(sk); 916 int rc = 0; 917 918 if (peer) { 919 if (sk->sk_state != TCP_ESTABLISHED) { 920 rc = -ENOTCONN; 921 goto out; 922 } 923 sx25->sx25_addr = x25->dest_addr; 924 } else 925 sx25->sx25_addr = x25->source_addr; 926 927 sx25->sx25_family = AF_X25; 928 rc = sizeof(*sx25); 929 930 out: 931 return rc; 932 } 933 934 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 935 unsigned int lci) 936 { 937 struct sock *sk; 938 struct sock *make; 939 struct x25_sock *makex25; 940 struct x25_address source_addr, dest_addr; 941 struct x25_facilities facilities; 942 struct x25_dte_facilities dte_facilities; 943 int len, addr_len, rc; 944 945 /* 946 * Remove the LCI and frame type. 947 */ 948 skb_pull(skb, X25_STD_MIN_LEN); 949 950 /* 951 * Extract the X.25 addresses and convert them to ASCII strings, 952 * and remove them. 953 * 954 * Address block is mandatory in call request packets 955 */ 956 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 957 if (addr_len <= 0) 958 goto out_clear_request; 959 skb_pull(skb, addr_len); 960 961 /* 962 * Get the length of the facilities, skip past them for the moment 963 * get the call user data because this is needed to determine 964 * the correct listener 965 * 966 * Facilities length is mandatory in call request packets 967 */ 968 if (!pskb_may_pull(skb, 1)) 969 goto out_clear_request; 970 len = skb->data[0] + 1; 971 if (!pskb_may_pull(skb, len)) 972 goto out_clear_request; 973 skb_pull(skb,len); 974 975 /* 976 * Ensure that the amount of call user data is valid. 977 */ 978 if (skb->len > X25_MAX_CUD_LEN) 979 goto out_clear_request; 980 981 /* 982 * Get all the call user data so it can be used in 983 * x25_find_listener and skb_copy_from_linear_data up ahead. 984 */ 985 if (!pskb_may_pull(skb, skb->len)) 986 goto out_clear_request; 987 988 /* 989 * Find a listener for the particular address/cud pair. 990 */ 991 sk = x25_find_listener(&source_addr,skb); 992 skb_push(skb,len); 993 994 if (sk != NULL && sk_acceptq_is_full(sk)) { 995 goto out_sock_put; 996 } 997 998 /* 999 * We dont have any listeners for this incoming call. 1000 * Try forwarding it. 1001 */ 1002 if (sk == NULL) { 1003 skb_push(skb, addr_len + X25_STD_MIN_LEN); 1004 if (sysctl_x25_forward && 1005 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 1006 { 1007 /* Call was forwarded, dont process it any more */ 1008 kfree_skb(skb); 1009 rc = 1; 1010 goto out; 1011 } else { 1012 /* No listeners, can't forward, clear the call */ 1013 goto out_clear_request; 1014 } 1015 } 1016 1017 /* 1018 * Try to reach a compromise on the requested facilities. 1019 */ 1020 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1021 if (len == -1) 1022 goto out_sock_put; 1023 1024 /* 1025 * current neighbour/link might impose additional limits 1026 * on certain facilities 1027 */ 1028 1029 x25_limit_facilities(&facilities, nb); 1030 1031 /* 1032 * Try to create a new socket. 1033 */ 1034 make = x25_make_new(sk); 1035 if (!make) 1036 goto out_sock_put; 1037 1038 /* 1039 * Remove the facilities 1040 */ 1041 skb_pull(skb, len); 1042 1043 skb->sk = make; 1044 make->sk_state = TCP_ESTABLISHED; 1045 1046 makex25 = x25_sk(make); 1047 makex25->lci = lci; 1048 makex25->dest_addr = dest_addr; 1049 makex25->source_addr = source_addr; 1050 x25_neigh_hold(nb); 1051 makex25->neighbour = nb; 1052 makex25->facilities = facilities; 1053 makex25->dte_facilities= dte_facilities; 1054 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1055 /* ensure no reverse facil on accept */ 1056 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1057 /* ensure no calling address extension on accept */ 1058 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1059 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1060 1061 /* Normally all calls are accepted immediately */ 1062 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1063 x25_write_internal(make, X25_CALL_ACCEPTED); 1064 makex25->state = X25_STATE_3; 1065 } else { 1066 makex25->state = X25_STATE_5; 1067 } 1068 1069 /* 1070 * Incoming Call User Data. 1071 */ 1072 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1073 makex25->calluserdata.cudlength = skb->len; 1074 1075 sk_acceptq_added(sk); 1076 1077 x25_insert_socket(make); 1078 1079 skb_queue_head(&sk->sk_receive_queue, skb); 1080 1081 x25_start_heartbeat(make); 1082 1083 if (!sock_flag(sk, SOCK_DEAD)) 1084 sk->sk_data_ready(sk); 1085 rc = 1; 1086 sock_put(sk); 1087 out: 1088 return rc; 1089 out_sock_put: 1090 sock_put(sk); 1091 out_clear_request: 1092 rc = 0; 1093 x25_transmit_clear_request(nb, lci, 0x01); 1094 goto out; 1095 } 1096 1097 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1098 { 1099 struct sock *sk = sock->sk; 1100 struct x25_sock *x25 = x25_sk(sk); 1101 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1102 struct sockaddr_x25 sx25; 1103 struct sk_buff *skb; 1104 unsigned char *asmptr; 1105 int noblock = msg->msg_flags & MSG_DONTWAIT; 1106 size_t size; 1107 int qbit = 0, rc = -EINVAL; 1108 1109 lock_sock(sk); 1110 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1111 goto out; 1112 1113 /* we currently don't support segmented records at the user interface */ 1114 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1115 goto out; 1116 1117 rc = -EADDRNOTAVAIL; 1118 if (sock_flag(sk, SOCK_ZAPPED)) 1119 goto out; 1120 1121 rc = -EPIPE; 1122 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1123 send_sig(SIGPIPE, current, 0); 1124 goto out; 1125 } 1126 1127 rc = -ENETUNREACH; 1128 if (!x25->neighbour) 1129 goto out; 1130 1131 if (usx25) { 1132 rc = -EINVAL; 1133 if (msg->msg_namelen < sizeof(sx25)) 1134 goto out; 1135 memcpy(&sx25, usx25, sizeof(sx25)); 1136 rc = -EISCONN; 1137 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1138 goto out; 1139 rc = -EINVAL; 1140 if (sx25.sx25_family != AF_X25) 1141 goto out; 1142 } else { 1143 /* 1144 * FIXME 1003.1g - if the socket is like this because 1145 * it has become closed (not started closed) we ought 1146 * to SIGPIPE, EPIPE; 1147 */ 1148 rc = -ENOTCONN; 1149 if (sk->sk_state != TCP_ESTABLISHED) 1150 goto out; 1151 1152 sx25.sx25_family = AF_X25; 1153 sx25.sx25_addr = x25->dest_addr; 1154 } 1155 1156 /* Sanity check the packet size */ 1157 if (len > 65535) { 1158 rc = -EMSGSIZE; 1159 goto out; 1160 } 1161 1162 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1163 1164 /* Build a packet */ 1165 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1166 1167 if ((msg->msg_flags & MSG_OOB) && len > 32) 1168 len = 32; 1169 1170 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1171 1172 release_sock(sk); 1173 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1174 lock_sock(sk); 1175 if (!skb) 1176 goto out; 1177 X25_SKB_CB(skb)->flags = msg->msg_flags; 1178 1179 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1180 1181 /* 1182 * Put the data on the end 1183 */ 1184 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1185 1186 skb_reset_transport_header(skb); 1187 skb_put(skb, len); 1188 1189 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1190 if (rc) 1191 goto out_kfree_skb; 1192 1193 /* 1194 * If the Q BIT Include socket option is in force, the first 1195 * byte of the user data is the logical value of the Q Bit. 1196 */ 1197 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1198 if (!pskb_may_pull(skb, 1)) 1199 goto out_kfree_skb; 1200 1201 qbit = skb->data[0]; 1202 skb_pull(skb, 1); 1203 } 1204 1205 /* 1206 * Push down the X.25 header 1207 */ 1208 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1209 1210 if (msg->msg_flags & MSG_OOB) { 1211 if (x25->neighbour->extended) { 1212 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1213 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1214 *asmptr++ = (x25->lci >> 0) & 0xFF; 1215 *asmptr++ = X25_INTERRUPT; 1216 } else { 1217 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1218 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1219 *asmptr++ = (x25->lci >> 0) & 0xFF; 1220 *asmptr++ = X25_INTERRUPT; 1221 } 1222 } else { 1223 if (x25->neighbour->extended) { 1224 /* Build an Extended X.25 header */ 1225 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1226 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1227 *asmptr++ = (x25->lci >> 0) & 0xFF; 1228 *asmptr++ = X25_DATA; 1229 *asmptr++ = X25_DATA; 1230 } else { 1231 /* Build an Standard X.25 header */ 1232 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1233 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1234 *asmptr++ = (x25->lci >> 0) & 0xFF; 1235 *asmptr++ = X25_DATA; 1236 } 1237 1238 if (qbit) 1239 skb->data[0] |= X25_Q_BIT; 1240 } 1241 1242 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1243 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1244 1245 rc = -ENOTCONN; 1246 if (sk->sk_state != TCP_ESTABLISHED) 1247 goto out_kfree_skb; 1248 1249 if (msg->msg_flags & MSG_OOB) 1250 skb_queue_tail(&x25->interrupt_out_queue, skb); 1251 else { 1252 rc = x25_output(sk, skb); 1253 len = rc; 1254 if (rc < 0) 1255 kfree_skb(skb); 1256 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1257 len++; 1258 } 1259 1260 x25_kick(sk); 1261 rc = len; 1262 out: 1263 release_sock(sk); 1264 return rc; 1265 out_kfree_skb: 1266 kfree_skb(skb); 1267 goto out; 1268 } 1269 1270 1271 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1272 int flags) 1273 { 1274 struct sock *sk = sock->sk; 1275 struct x25_sock *x25 = x25_sk(sk); 1276 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1277 size_t copied; 1278 int qbit, header_len; 1279 struct sk_buff *skb; 1280 unsigned char *asmptr; 1281 int rc = -ENOTCONN; 1282 1283 lock_sock(sk); 1284 1285 if (x25->neighbour == NULL) 1286 goto out; 1287 1288 header_len = x25->neighbour->extended ? 1289 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1290 1291 /* 1292 * This works for seqpacket too. The receiver has ordered the queue for 1293 * us! We do one quick check first though 1294 */ 1295 if (sk->sk_state != TCP_ESTABLISHED) 1296 goto out; 1297 1298 if (flags & MSG_OOB) { 1299 rc = -EINVAL; 1300 if (sock_flag(sk, SOCK_URGINLINE) || 1301 !skb_peek(&x25->interrupt_in_queue)) 1302 goto out; 1303 1304 skb = skb_dequeue(&x25->interrupt_in_queue); 1305 1306 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1307 goto out_free_dgram; 1308 1309 skb_pull(skb, X25_STD_MIN_LEN); 1310 1311 /* 1312 * No Q bit information on Interrupt data. 1313 */ 1314 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1315 asmptr = skb_push(skb, 1); 1316 *asmptr = 0x00; 1317 } 1318 1319 msg->msg_flags |= MSG_OOB; 1320 } else { 1321 /* Now we can treat all alike */ 1322 release_sock(sk); 1323 skb = skb_recv_datagram(sk, flags, &rc); 1324 lock_sock(sk); 1325 if (!skb) 1326 goto out; 1327 1328 if (!pskb_may_pull(skb, header_len)) 1329 goto out_free_dgram; 1330 1331 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1332 1333 skb_pull(skb, header_len); 1334 1335 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1336 asmptr = skb_push(skb, 1); 1337 *asmptr = qbit; 1338 } 1339 } 1340 1341 skb_reset_transport_header(skb); 1342 copied = skb->len; 1343 1344 if (copied > size) { 1345 copied = size; 1346 msg->msg_flags |= MSG_TRUNC; 1347 } 1348 1349 /* Currently, each datagram always contains a complete record */ 1350 msg->msg_flags |= MSG_EOR; 1351 1352 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1353 if (rc) 1354 goto out_free_dgram; 1355 1356 if (sx25) { 1357 sx25->sx25_family = AF_X25; 1358 sx25->sx25_addr = x25->dest_addr; 1359 msg->msg_namelen = sizeof(*sx25); 1360 } 1361 1362 x25_check_rbuf(sk); 1363 rc = copied; 1364 out_free_dgram: 1365 skb_free_datagram(sk, skb); 1366 out: 1367 release_sock(sk); 1368 return rc; 1369 } 1370 1371 1372 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1373 { 1374 struct sock *sk = sock->sk; 1375 struct x25_sock *x25 = x25_sk(sk); 1376 void __user *argp = (void __user *)arg; 1377 int rc; 1378 1379 switch (cmd) { 1380 case TIOCOUTQ: { 1381 int amount; 1382 1383 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1384 if (amount < 0) 1385 amount = 0; 1386 rc = put_user(amount, (unsigned int __user *)argp); 1387 break; 1388 } 1389 1390 case TIOCINQ: { 1391 struct sk_buff *skb; 1392 int amount = 0; 1393 /* 1394 * These two are safe on a single CPU system as 1395 * only user tasks fiddle here 1396 */ 1397 lock_sock(sk); 1398 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1399 amount = skb->len; 1400 release_sock(sk); 1401 rc = put_user(amount, (unsigned int __user *)argp); 1402 break; 1403 } 1404 1405 case SIOCGIFADDR: 1406 case SIOCSIFADDR: 1407 case SIOCGIFDSTADDR: 1408 case SIOCSIFDSTADDR: 1409 case SIOCGIFBRDADDR: 1410 case SIOCSIFBRDADDR: 1411 case SIOCGIFNETMASK: 1412 case SIOCSIFNETMASK: 1413 case SIOCGIFMETRIC: 1414 case SIOCSIFMETRIC: 1415 rc = -EINVAL; 1416 break; 1417 case SIOCADDRT: 1418 case SIOCDELRT: 1419 rc = -EPERM; 1420 if (!capable(CAP_NET_ADMIN)) 1421 break; 1422 rc = x25_route_ioctl(cmd, argp); 1423 break; 1424 case SIOCX25GSUBSCRIP: 1425 rc = x25_subscr_ioctl(cmd, argp); 1426 break; 1427 case SIOCX25SSUBSCRIP: 1428 rc = -EPERM; 1429 if (!capable(CAP_NET_ADMIN)) 1430 break; 1431 rc = x25_subscr_ioctl(cmd, argp); 1432 break; 1433 case SIOCX25GFACILITIES: { 1434 lock_sock(sk); 1435 rc = copy_to_user(argp, &x25->facilities, 1436 sizeof(x25->facilities)) 1437 ? -EFAULT : 0; 1438 release_sock(sk); 1439 break; 1440 } 1441 1442 case SIOCX25SFACILITIES: { 1443 struct x25_facilities facilities; 1444 rc = -EFAULT; 1445 if (copy_from_user(&facilities, argp, sizeof(facilities))) 1446 break; 1447 rc = -EINVAL; 1448 lock_sock(sk); 1449 if (sk->sk_state != TCP_LISTEN && 1450 sk->sk_state != TCP_CLOSE) 1451 goto out_fac_release; 1452 if (facilities.pacsize_in < X25_PS16 || 1453 facilities.pacsize_in > X25_PS4096) 1454 goto out_fac_release; 1455 if (facilities.pacsize_out < X25_PS16 || 1456 facilities.pacsize_out > X25_PS4096) 1457 goto out_fac_release; 1458 if (facilities.winsize_in < 1 || 1459 facilities.winsize_in > 127) 1460 goto out_fac_release; 1461 if (facilities.throughput) { 1462 int out = facilities.throughput & 0xf0; 1463 int in = facilities.throughput & 0x0f; 1464 if (!out) 1465 facilities.throughput |= 1466 X25_DEFAULT_THROUGHPUT << 4; 1467 else if (out < 0x30 || out > 0xD0) 1468 goto out_fac_release; 1469 if (!in) 1470 facilities.throughput |= 1471 X25_DEFAULT_THROUGHPUT; 1472 else if (in < 0x03 || in > 0x0D) 1473 goto out_fac_release; 1474 } 1475 if (facilities.reverse && 1476 (facilities.reverse & 0x81) != 0x81) 1477 goto out_fac_release; 1478 x25->facilities = facilities; 1479 rc = 0; 1480 out_fac_release: 1481 release_sock(sk); 1482 break; 1483 } 1484 1485 case SIOCX25GDTEFACILITIES: { 1486 lock_sock(sk); 1487 rc = copy_to_user(argp, &x25->dte_facilities, 1488 sizeof(x25->dte_facilities)); 1489 release_sock(sk); 1490 if (rc) 1491 rc = -EFAULT; 1492 break; 1493 } 1494 1495 case SIOCX25SDTEFACILITIES: { 1496 struct x25_dte_facilities dtefacs; 1497 rc = -EFAULT; 1498 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1499 break; 1500 rc = -EINVAL; 1501 lock_sock(sk); 1502 if (sk->sk_state != TCP_LISTEN && 1503 sk->sk_state != TCP_CLOSE) 1504 goto out_dtefac_release; 1505 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1506 goto out_dtefac_release; 1507 if (dtefacs.called_len > X25_MAX_AE_LEN) 1508 goto out_dtefac_release; 1509 x25->dte_facilities = dtefacs; 1510 rc = 0; 1511 out_dtefac_release: 1512 release_sock(sk); 1513 break; 1514 } 1515 1516 case SIOCX25GCALLUSERDATA: { 1517 lock_sock(sk); 1518 rc = copy_to_user(argp, &x25->calluserdata, 1519 sizeof(x25->calluserdata)) 1520 ? -EFAULT : 0; 1521 release_sock(sk); 1522 break; 1523 } 1524 1525 case SIOCX25SCALLUSERDATA: { 1526 struct x25_calluserdata calluserdata; 1527 1528 rc = -EFAULT; 1529 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata))) 1530 break; 1531 rc = -EINVAL; 1532 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1533 break; 1534 lock_sock(sk); 1535 x25->calluserdata = calluserdata; 1536 release_sock(sk); 1537 rc = 0; 1538 break; 1539 } 1540 1541 case SIOCX25GCAUSEDIAG: { 1542 lock_sock(sk); 1543 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag)) 1544 ? -EFAULT : 0; 1545 release_sock(sk); 1546 break; 1547 } 1548 1549 case SIOCX25SCAUSEDIAG: { 1550 struct x25_causediag causediag; 1551 rc = -EFAULT; 1552 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1553 break; 1554 lock_sock(sk); 1555 x25->causediag = causediag; 1556 release_sock(sk); 1557 rc = 0; 1558 break; 1559 1560 } 1561 1562 case SIOCX25SCUDMATCHLEN: { 1563 struct x25_subaddr sub_addr; 1564 rc = -EINVAL; 1565 lock_sock(sk); 1566 if(sk->sk_state != TCP_CLOSE) 1567 goto out_cud_release; 1568 rc = -EFAULT; 1569 if (copy_from_user(&sub_addr, argp, 1570 sizeof(sub_addr))) 1571 goto out_cud_release; 1572 rc = -EINVAL; 1573 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1574 goto out_cud_release; 1575 x25->cudmatchlength = sub_addr.cudmatchlength; 1576 rc = 0; 1577 out_cud_release: 1578 release_sock(sk); 1579 break; 1580 } 1581 1582 case SIOCX25CALLACCPTAPPRV: { 1583 rc = -EINVAL; 1584 lock_sock(sk); 1585 if (sk->sk_state == TCP_CLOSE) { 1586 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1587 rc = 0; 1588 } 1589 release_sock(sk); 1590 break; 1591 } 1592 1593 case SIOCX25SENDCALLACCPT: { 1594 rc = -EINVAL; 1595 lock_sock(sk); 1596 if (sk->sk_state != TCP_ESTABLISHED) 1597 goto out_sendcallaccpt_release; 1598 /* must call accptapprv above */ 1599 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1600 goto out_sendcallaccpt_release; 1601 x25_write_internal(sk, X25_CALL_ACCEPTED); 1602 x25->state = X25_STATE_3; 1603 rc = 0; 1604 out_sendcallaccpt_release: 1605 release_sock(sk); 1606 break; 1607 } 1608 1609 default: 1610 rc = -ENOIOCTLCMD; 1611 break; 1612 } 1613 1614 return rc; 1615 } 1616 1617 static const struct net_proto_family x25_family_ops = { 1618 .family = AF_X25, 1619 .create = x25_create, 1620 .owner = THIS_MODULE, 1621 }; 1622 1623 #ifdef CONFIG_COMPAT 1624 static int compat_x25_subscr_ioctl(unsigned int cmd, 1625 struct compat_x25_subscrip_struct __user *x25_subscr32) 1626 { 1627 struct compat_x25_subscrip_struct x25_subscr; 1628 struct x25_neigh *nb; 1629 struct net_device *dev; 1630 int rc = -EINVAL; 1631 1632 rc = -EFAULT; 1633 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1634 goto out; 1635 1636 rc = -EINVAL; 1637 dev = x25_dev_get(x25_subscr.device); 1638 if (dev == NULL) 1639 goto out; 1640 1641 nb = x25_get_neigh(dev); 1642 if (nb == NULL) 1643 goto out_dev_put; 1644 1645 dev_put(dev); 1646 1647 if (cmd == SIOCX25GSUBSCRIP) { 1648 read_lock_bh(&x25_neigh_list_lock); 1649 x25_subscr.extended = nb->extended; 1650 x25_subscr.global_facil_mask = nb->global_facil_mask; 1651 read_unlock_bh(&x25_neigh_list_lock); 1652 rc = copy_to_user(x25_subscr32, &x25_subscr, 1653 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1654 } else { 1655 rc = -EINVAL; 1656 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1657 rc = 0; 1658 write_lock_bh(&x25_neigh_list_lock); 1659 nb->extended = x25_subscr.extended; 1660 nb->global_facil_mask = x25_subscr.global_facil_mask; 1661 write_unlock_bh(&x25_neigh_list_lock); 1662 } 1663 } 1664 x25_neigh_put(nb); 1665 out: 1666 return rc; 1667 out_dev_put: 1668 dev_put(dev); 1669 goto out; 1670 } 1671 1672 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1673 unsigned long arg) 1674 { 1675 void __user *argp = compat_ptr(arg); 1676 int rc = -ENOIOCTLCMD; 1677 1678 switch(cmd) { 1679 case TIOCOUTQ: 1680 case TIOCINQ: 1681 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1682 break; 1683 case SIOCGIFADDR: 1684 case SIOCSIFADDR: 1685 case SIOCGIFDSTADDR: 1686 case SIOCSIFDSTADDR: 1687 case SIOCGIFBRDADDR: 1688 case SIOCSIFBRDADDR: 1689 case SIOCGIFNETMASK: 1690 case SIOCSIFNETMASK: 1691 case SIOCGIFMETRIC: 1692 case SIOCSIFMETRIC: 1693 rc = -EINVAL; 1694 break; 1695 case SIOCADDRT: 1696 case SIOCDELRT: 1697 rc = -EPERM; 1698 if (!capable(CAP_NET_ADMIN)) 1699 break; 1700 rc = x25_route_ioctl(cmd, argp); 1701 break; 1702 case SIOCX25GSUBSCRIP: 1703 rc = compat_x25_subscr_ioctl(cmd, argp); 1704 break; 1705 case SIOCX25SSUBSCRIP: 1706 rc = -EPERM; 1707 if (!capable(CAP_NET_ADMIN)) 1708 break; 1709 rc = compat_x25_subscr_ioctl(cmd, argp); 1710 break; 1711 case SIOCX25GFACILITIES: 1712 case SIOCX25SFACILITIES: 1713 case SIOCX25GDTEFACILITIES: 1714 case SIOCX25SDTEFACILITIES: 1715 case SIOCX25GCALLUSERDATA: 1716 case SIOCX25SCALLUSERDATA: 1717 case SIOCX25GCAUSEDIAG: 1718 case SIOCX25SCAUSEDIAG: 1719 case SIOCX25SCUDMATCHLEN: 1720 case SIOCX25CALLACCPTAPPRV: 1721 case SIOCX25SENDCALLACCPT: 1722 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1723 break; 1724 default: 1725 rc = -ENOIOCTLCMD; 1726 break; 1727 } 1728 return rc; 1729 } 1730 #endif 1731 1732 static const struct proto_ops x25_proto_ops = { 1733 .family = AF_X25, 1734 .owner = THIS_MODULE, 1735 .release = x25_release, 1736 .bind = x25_bind, 1737 .connect = x25_connect, 1738 .socketpair = sock_no_socketpair, 1739 .accept = x25_accept, 1740 .getname = x25_getname, 1741 .poll = datagram_poll, 1742 .ioctl = x25_ioctl, 1743 #ifdef CONFIG_COMPAT 1744 .compat_ioctl = compat_x25_ioctl, 1745 #endif 1746 .gettstamp = sock_gettstamp, 1747 .listen = x25_listen, 1748 .shutdown = sock_no_shutdown, 1749 .setsockopt = x25_setsockopt, 1750 .getsockopt = x25_getsockopt, 1751 .sendmsg = x25_sendmsg, 1752 .recvmsg = x25_recvmsg, 1753 .mmap = sock_no_mmap, 1754 .sendpage = sock_no_sendpage, 1755 }; 1756 1757 static struct packet_type x25_packet_type __read_mostly = { 1758 .type = cpu_to_be16(ETH_P_X25), 1759 .func = x25_lapb_receive_frame, 1760 }; 1761 1762 static struct notifier_block x25_dev_notifier = { 1763 .notifier_call = x25_device_event, 1764 }; 1765 1766 void x25_kill_by_neigh(struct x25_neigh *nb) 1767 { 1768 struct sock *s; 1769 1770 write_lock_bh(&x25_list_lock); 1771 1772 sk_for_each(s, &x25_list) { 1773 if (x25_sk(s)->neighbour == nb) { 1774 write_unlock_bh(&x25_list_lock); 1775 lock_sock(s); 1776 x25_disconnect(s, ENETUNREACH, 0, 0); 1777 release_sock(s); 1778 write_lock_bh(&x25_list_lock); 1779 } 1780 } 1781 write_unlock_bh(&x25_list_lock); 1782 1783 /* Remove any related forwards */ 1784 x25_clear_forward_by_dev(nb->dev); 1785 } 1786 1787 static int __init x25_init(void) 1788 { 1789 int rc; 1790 1791 rc = proto_register(&x25_proto, 0); 1792 if (rc) 1793 goto out; 1794 1795 rc = sock_register(&x25_family_ops); 1796 if (rc) 1797 goto out_proto; 1798 1799 dev_add_pack(&x25_packet_type); 1800 1801 rc = register_netdevice_notifier(&x25_dev_notifier); 1802 if (rc) 1803 goto out_sock; 1804 1805 rc = x25_register_sysctl(); 1806 if (rc) 1807 goto out_dev; 1808 1809 rc = x25_proc_init(); 1810 if (rc) 1811 goto out_sysctl; 1812 1813 pr_info("Linux Version 0.2\n"); 1814 1815 out: 1816 return rc; 1817 out_sysctl: 1818 x25_unregister_sysctl(); 1819 out_dev: 1820 unregister_netdevice_notifier(&x25_dev_notifier); 1821 out_sock: 1822 dev_remove_pack(&x25_packet_type); 1823 sock_unregister(AF_X25); 1824 out_proto: 1825 proto_unregister(&x25_proto); 1826 goto out; 1827 } 1828 module_init(x25_init); 1829 1830 static void __exit x25_exit(void) 1831 { 1832 x25_proc_exit(); 1833 x25_link_free(); 1834 x25_route_free(); 1835 1836 x25_unregister_sysctl(); 1837 1838 unregister_netdevice_notifier(&x25_dev_notifier); 1839 1840 dev_remove_pack(&x25_packet_type); 1841 1842 sock_unregister(AF_X25); 1843 proto_unregister(&x25_proto); 1844 } 1845 module_exit(x25_exit); 1846 1847 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1848 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1849 MODULE_LICENSE("GPL"); 1850 MODULE_ALIAS_NETPROTO(PF_X25); 1851