1 /* 2 * X.25 Packet Layer release 002 3 * 4 * This is ALPHA test software. This code may break your machine, 5 * randomly fail to work with new releases, misbehave and/or generally 6 * screw up. It might even work. 7 * 8 * This code REQUIRES 2.1.15 or higher 9 * 10 * This module: 11 * This module is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 * 16 * History 17 * X.25 001 Jonathan Naylor Started coding. 18 * X.25 002 Jonathan Naylor Centralised disconnect handling. 19 * New timer architecture. 20 * 2000-03-11 Henner Eisen MSG_EOR handling more POSIX compliant. 21 * 2000-03-22 Daniela Squassoni Allowed disabling/enabling of 22 * facilities negotiation and increased 23 * the throughput upper limit. 24 * 2000-08-27 Arnaldo C. Melo s/suser/capable/ + micro cleanups 25 * 2000-09-04 Henner Eisen Set sock->state in x25_accept(). 26 * Fixed x25_output() related skb leakage. 27 * 2000-10-02 Henner Eisen Made x25_kick() single threaded per socket. 28 * 2000-10-27 Henner Eisen MSG_DONTWAIT for fragment allocation. 29 * 2000-11-14 Henner Eisen Closing datalink from NETDEV_GOING_DOWN 30 * 2002-10-06 Arnaldo C. Melo Get rid of cli/sti, move proc stuff to 31 * x25_proc.c, using seq_file 32 * 2005-04-02 Shaun Pereira Selective sub address matching 33 * with call user data 34 * 2005-04-15 Shaun Pereira Fast select with no restriction on 35 * response 36 */ 37 38 #define pr_fmt(fmt) "X25: " fmt 39 40 #include <linux/module.h> 41 #include <linux/capability.h> 42 #include <linux/errno.h> 43 #include <linux/kernel.h> 44 #include <linux/sched/signal.h> 45 #include <linux/timer.h> 46 #include <linux/string.h> 47 #include <linux/net.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_arp.h> 50 #include <linux/skbuff.h> 51 #include <linux/slab.h> 52 #include <net/sock.h> 53 #include <net/tcp_states.h> 54 #include <linux/uaccess.h> 55 #include <linux/fcntl.h> 56 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 57 #include <linux/notifier.h> 58 #include <linux/init.h> 59 #include <linux/compat.h> 60 #include <linux/ctype.h> 61 62 #include <net/x25.h> 63 #include <net/compat.h> 64 65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 66 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 67 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 68 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 69 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 70 int sysctl_x25_forward = 0; 71 72 HLIST_HEAD(x25_list); 73 DEFINE_RWLOCK(x25_list_lock); 74 75 static const struct proto_ops x25_proto_ops; 76 77 static const struct x25_address null_x25_address = {" "}; 78 79 #ifdef CONFIG_COMPAT 80 struct compat_x25_subscrip_struct { 81 char device[200-sizeof(compat_ulong_t)]; 82 compat_ulong_t global_facil_mask; 83 compat_uint_t extended; 84 }; 85 #endif 86 87 88 int x25_parse_address_block(struct sk_buff *skb, 89 struct x25_address *called_addr, 90 struct x25_address *calling_addr) 91 { 92 unsigned char len; 93 int needed; 94 int rc; 95 96 if (!pskb_may_pull(skb, 1)) { 97 /* packet has no address block */ 98 rc = 0; 99 goto empty; 100 } 101 102 len = *skb->data; 103 needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2; 104 105 if (!pskb_may_pull(skb, needed)) { 106 /* packet is too short to hold the addresses it claims 107 to hold */ 108 rc = -1; 109 goto empty; 110 } 111 112 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 113 114 empty: 115 *called_addr->x25_addr = 0; 116 *calling_addr->x25_addr = 0; 117 118 return rc; 119 } 120 121 122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 123 struct x25_address *calling_addr) 124 { 125 unsigned int called_len, calling_len; 126 char *called, *calling; 127 unsigned int i; 128 129 called_len = (*p >> 0) & 0x0F; 130 calling_len = (*p >> 4) & 0x0F; 131 132 called = called_addr->x25_addr; 133 calling = calling_addr->x25_addr; 134 p++; 135 136 for (i = 0; i < (called_len + calling_len); i++) { 137 if (i < called_len) { 138 if (i % 2 != 0) { 139 *called++ = ((*p >> 0) & 0x0F) + '0'; 140 p++; 141 } else { 142 *called++ = ((*p >> 4) & 0x0F) + '0'; 143 } 144 } else { 145 if (i % 2 != 0) { 146 *calling++ = ((*p >> 0) & 0x0F) + '0'; 147 p++; 148 } else { 149 *calling++ = ((*p >> 4) & 0x0F) + '0'; 150 } 151 } 152 } 153 154 *called = *calling = '\0'; 155 156 return 1 + (called_len + calling_len + 1) / 2; 157 } 158 159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 160 struct x25_address *calling_addr) 161 { 162 unsigned int called_len, calling_len; 163 char *called, *calling; 164 int i; 165 166 called = called_addr->x25_addr; 167 calling = calling_addr->x25_addr; 168 169 called_len = strlen(called); 170 calling_len = strlen(calling); 171 172 *p++ = (calling_len << 4) | (called_len << 0); 173 174 for (i = 0; i < (called_len + calling_len); i++) { 175 if (i < called_len) { 176 if (i % 2 != 0) { 177 *p |= (*called++ - '0') << 0; 178 p++; 179 } else { 180 *p = 0x00; 181 *p |= (*called++ - '0') << 4; 182 } 183 } else { 184 if (i % 2 != 0) { 185 *p |= (*calling++ - '0') << 0; 186 p++; 187 } else { 188 *p = 0x00; 189 *p |= (*calling++ - '0') << 4; 190 } 191 } 192 } 193 194 return 1 + (called_len + calling_len + 1) / 2; 195 } 196 197 /* 198 * Socket removal during an interrupt is now safe. 199 */ 200 static void x25_remove_socket(struct sock *sk) 201 { 202 write_lock_bh(&x25_list_lock); 203 sk_del_node_init(sk); 204 write_unlock_bh(&x25_list_lock); 205 } 206 207 /* 208 * Kill all bound sockets on a dropped device. 209 */ 210 static void x25_kill_by_device(struct net_device *dev) 211 { 212 struct sock *s; 213 214 write_lock_bh(&x25_list_lock); 215 216 sk_for_each(s, &x25_list) 217 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 218 x25_disconnect(s, ENETUNREACH, 0, 0); 219 220 write_unlock_bh(&x25_list_lock); 221 } 222 223 /* 224 * Handle device status changes. 225 */ 226 static int x25_device_event(struct notifier_block *this, unsigned long event, 227 void *ptr) 228 { 229 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 230 struct x25_neigh *nb; 231 232 if (!net_eq(dev_net(dev), &init_net)) 233 return NOTIFY_DONE; 234 235 if (dev->type == ARPHRD_X25 236 #if IS_ENABLED(CONFIG_LLC) 237 || dev->type == ARPHRD_ETHER 238 #endif 239 ) { 240 switch (event) { 241 case NETDEV_UP: 242 x25_link_device_up(dev); 243 break; 244 case NETDEV_GOING_DOWN: 245 nb = x25_get_neigh(dev); 246 if (nb) { 247 x25_terminate_link(nb); 248 x25_neigh_put(nb); 249 } 250 break; 251 case NETDEV_DOWN: 252 x25_kill_by_device(dev); 253 x25_route_device_down(dev); 254 x25_link_device_down(dev); 255 break; 256 } 257 } 258 259 return NOTIFY_DONE; 260 } 261 262 /* 263 * Add a socket to the bound sockets list. 264 */ 265 static void x25_insert_socket(struct sock *sk) 266 { 267 write_lock_bh(&x25_list_lock); 268 sk_add_node(sk, &x25_list); 269 write_unlock_bh(&x25_list_lock); 270 } 271 272 /* 273 * Find a socket that wants to accept the Call Request we just 274 * received. Check the full list for an address/cud match. 275 * If no cuds match return the next_best thing, an address match. 276 * Note: if a listening socket has cud set it must only get calls 277 * with matching cud. 278 */ 279 static struct sock *x25_find_listener(struct x25_address *addr, 280 struct sk_buff *skb) 281 { 282 struct sock *s; 283 struct sock *next_best; 284 285 read_lock_bh(&x25_list_lock); 286 next_best = NULL; 287 288 sk_for_each(s, &x25_list) 289 if ((!strcmp(addr->x25_addr, 290 x25_sk(s)->source_addr.x25_addr) || 291 !strcmp(x25_sk(s)->source_addr.x25_addr, 292 null_x25_address.x25_addr)) && 293 s->sk_state == TCP_LISTEN) { 294 /* 295 * Found a listening socket, now check the incoming 296 * call user data vs this sockets call user data 297 */ 298 if (x25_sk(s)->cudmatchlength > 0 && 299 skb->len >= x25_sk(s)->cudmatchlength) { 300 if((memcmp(x25_sk(s)->calluserdata.cuddata, 301 skb->data, 302 x25_sk(s)->cudmatchlength)) == 0) { 303 sock_hold(s); 304 goto found; 305 } 306 } else 307 next_best = s; 308 } 309 if (next_best) { 310 s = next_best; 311 sock_hold(s); 312 goto found; 313 } 314 s = NULL; 315 found: 316 read_unlock_bh(&x25_list_lock); 317 return s; 318 } 319 320 /* 321 * Find a connected X.25 socket given my LCI and neighbour. 322 */ 323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 324 { 325 struct sock *s; 326 327 sk_for_each(s, &x25_list) 328 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 329 sock_hold(s); 330 goto found; 331 } 332 s = NULL; 333 found: 334 return s; 335 } 336 337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 338 { 339 struct sock *s; 340 341 read_lock_bh(&x25_list_lock); 342 s = __x25_find_socket(lci, nb); 343 read_unlock_bh(&x25_list_lock); 344 return s; 345 } 346 347 /* 348 * Find a unique LCI for a given device. 349 */ 350 static unsigned int x25_new_lci(struct x25_neigh *nb) 351 { 352 unsigned int lci = 1; 353 struct sock *sk; 354 355 while ((sk = x25_find_socket(lci, nb)) != NULL) { 356 sock_put(sk); 357 if (++lci == 4096) { 358 lci = 0; 359 break; 360 } 361 cond_resched(); 362 } 363 364 return lci; 365 } 366 367 /* 368 * Deferred destroy. 369 */ 370 static void __x25_destroy_socket(struct sock *); 371 372 /* 373 * handler for deferred kills. 374 */ 375 static void x25_destroy_timer(struct timer_list *t) 376 { 377 struct sock *sk = from_timer(sk, t, sk_timer); 378 379 x25_destroy_socket_from_timer(sk); 380 } 381 382 /* 383 * This is called from user mode and the timers. Thus it protects itself 384 * against interrupt users but doesn't worry about being called during 385 * work. Once it is removed from the queue no interrupt or bottom half 386 * will touch it and we are (fairly 8-) ) safe. 387 * Not static as it's used by the timer 388 */ 389 static void __x25_destroy_socket(struct sock *sk) 390 { 391 struct sk_buff *skb; 392 393 x25_stop_heartbeat(sk); 394 x25_stop_timer(sk); 395 396 x25_remove_socket(sk); 397 x25_clear_queues(sk); /* Flush the queues */ 398 399 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 400 if (skb->sk != sk) { /* A pending connection */ 401 /* 402 * Queue the unaccepted socket for death 403 */ 404 skb->sk->sk_state = TCP_LISTEN; 405 sock_set_flag(skb->sk, SOCK_DEAD); 406 x25_start_heartbeat(skb->sk); 407 x25_sk(skb->sk)->state = X25_STATE_0; 408 } 409 410 kfree_skb(skb); 411 } 412 413 if (sk_has_allocations(sk)) { 414 /* Defer: outstanding buffers */ 415 sk->sk_timer.expires = jiffies + 10 * HZ; 416 sk->sk_timer.function = x25_destroy_timer; 417 add_timer(&sk->sk_timer); 418 } else { 419 /* drop last reference so sock_put will free */ 420 __sock_put(sk); 421 } 422 } 423 424 void x25_destroy_socket_from_timer(struct sock *sk) 425 { 426 sock_hold(sk); 427 bh_lock_sock(sk); 428 __x25_destroy_socket(sk); 429 bh_unlock_sock(sk); 430 sock_put(sk); 431 } 432 433 /* 434 * Handling for system calls applied via the various interfaces to a 435 * X.25 socket object. 436 */ 437 438 static int x25_setsockopt(struct socket *sock, int level, int optname, 439 char __user *optval, unsigned int optlen) 440 { 441 int opt; 442 struct sock *sk = sock->sk; 443 int rc = -ENOPROTOOPT; 444 445 if (level != SOL_X25 || optname != X25_QBITINCL) 446 goto out; 447 448 rc = -EINVAL; 449 if (optlen < sizeof(int)) 450 goto out; 451 452 rc = -EFAULT; 453 if (get_user(opt, (int __user *)optval)) 454 goto out; 455 456 if (opt) 457 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 458 else 459 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 460 rc = 0; 461 out: 462 return rc; 463 } 464 465 static int x25_getsockopt(struct socket *sock, int level, int optname, 466 char __user *optval, int __user *optlen) 467 { 468 struct sock *sk = sock->sk; 469 int val, len, rc = -ENOPROTOOPT; 470 471 if (level != SOL_X25 || optname != X25_QBITINCL) 472 goto out; 473 474 rc = -EFAULT; 475 if (get_user(len, optlen)) 476 goto out; 477 478 len = min_t(unsigned int, len, sizeof(int)); 479 480 rc = -EINVAL; 481 if (len < 0) 482 goto out; 483 484 rc = -EFAULT; 485 if (put_user(len, optlen)) 486 goto out; 487 488 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 489 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 490 out: 491 return rc; 492 } 493 494 static int x25_listen(struct socket *sock, int backlog) 495 { 496 struct sock *sk = sock->sk; 497 int rc = -EOPNOTSUPP; 498 499 lock_sock(sk); 500 if (sk->sk_state != TCP_LISTEN) { 501 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 502 sk->sk_max_ack_backlog = backlog; 503 sk->sk_state = TCP_LISTEN; 504 rc = 0; 505 } 506 release_sock(sk); 507 508 return rc; 509 } 510 511 static struct proto x25_proto = { 512 .name = "X25", 513 .owner = THIS_MODULE, 514 .obj_size = sizeof(struct x25_sock), 515 }; 516 517 static struct sock *x25_alloc_socket(struct net *net, int kern) 518 { 519 struct x25_sock *x25; 520 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern); 521 522 if (!sk) 523 goto out; 524 525 sock_init_data(NULL, sk); 526 527 x25 = x25_sk(sk); 528 skb_queue_head_init(&x25->ack_queue); 529 skb_queue_head_init(&x25->fragment_queue); 530 skb_queue_head_init(&x25->interrupt_in_queue); 531 skb_queue_head_init(&x25->interrupt_out_queue); 532 out: 533 return sk; 534 } 535 536 static int x25_create(struct net *net, struct socket *sock, int protocol, 537 int kern) 538 { 539 struct sock *sk; 540 struct x25_sock *x25; 541 int rc = -EAFNOSUPPORT; 542 543 if (!net_eq(net, &init_net)) 544 goto out; 545 546 rc = -ESOCKTNOSUPPORT; 547 if (sock->type != SOCK_SEQPACKET) 548 goto out; 549 550 rc = -EINVAL; 551 if (protocol) 552 goto out; 553 554 rc = -ENOBUFS; 555 if ((sk = x25_alloc_socket(net, kern)) == NULL) 556 goto out; 557 558 x25 = x25_sk(sk); 559 560 sock_init_data(sock, sk); 561 562 x25_init_timers(sk); 563 564 sock->ops = &x25_proto_ops; 565 sk->sk_protocol = protocol; 566 sk->sk_backlog_rcv = x25_backlog_rcv; 567 568 x25->t21 = sysctl_x25_call_request_timeout; 569 x25->t22 = sysctl_x25_reset_request_timeout; 570 x25->t23 = sysctl_x25_clear_request_timeout; 571 x25->t2 = sysctl_x25_ack_holdback_timeout; 572 x25->state = X25_STATE_0; 573 x25->cudmatchlength = 0; 574 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 575 /* on call accept */ 576 577 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 578 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 579 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 580 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 581 x25->facilities.throughput = 0; /* by default don't negotiate 582 throughput */ 583 x25->facilities.reverse = X25_DEFAULT_REVERSE; 584 x25->dte_facilities.calling_len = 0; 585 x25->dte_facilities.called_len = 0; 586 memset(x25->dte_facilities.called_ae, '\0', 587 sizeof(x25->dte_facilities.called_ae)); 588 memset(x25->dte_facilities.calling_ae, '\0', 589 sizeof(x25->dte_facilities.calling_ae)); 590 591 rc = 0; 592 out: 593 return rc; 594 } 595 596 static struct sock *x25_make_new(struct sock *osk) 597 { 598 struct sock *sk = NULL; 599 struct x25_sock *x25, *ox25; 600 601 if (osk->sk_type != SOCK_SEQPACKET) 602 goto out; 603 604 if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL) 605 goto out; 606 607 x25 = x25_sk(sk); 608 609 sk->sk_type = osk->sk_type; 610 sk->sk_priority = osk->sk_priority; 611 sk->sk_protocol = osk->sk_protocol; 612 sk->sk_rcvbuf = osk->sk_rcvbuf; 613 sk->sk_sndbuf = osk->sk_sndbuf; 614 sk->sk_state = TCP_ESTABLISHED; 615 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 616 sock_copy_flags(sk, osk); 617 618 ox25 = x25_sk(osk); 619 x25->t21 = ox25->t21; 620 x25->t22 = ox25->t22; 621 x25->t23 = ox25->t23; 622 x25->t2 = ox25->t2; 623 x25->flags = ox25->flags; 624 x25->facilities = ox25->facilities; 625 x25->dte_facilities = ox25->dte_facilities; 626 x25->cudmatchlength = ox25->cudmatchlength; 627 628 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 629 x25_init_timers(sk); 630 out: 631 return sk; 632 } 633 634 static int x25_release(struct socket *sock) 635 { 636 struct sock *sk = sock->sk; 637 struct x25_sock *x25; 638 639 if (!sk) 640 return 0; 641 642 x25 = x25_sk(sk); 643 644 sock_hold(sk); 645 lock_sock(sk); 646 switch (x25->state) { 647 648 case X25_STATE_0: 649 case X25_STATE_2: 650 x25_disconnect(sk, 0, 0, 0); 651 __x25_destroy_socket(sk); 652 goto out; 653 654 case X25_STATE_1: 655 case X25_STATE_3: 656 case X25_STATE_4: 657 x25_clear_queues(sk); 658 x25_write_internal(sk, X25_CLEAR_REQUEST); 659 x25_start_t23timer(sk); 660 x25->state = X25_STATE_2; 661 sk->sk_state = TCP_CLOSE; 662 sk->sk_shutdown |= SEND_SHUTDOWN; 663 sk->sk_state_change(sk); 664 sock_set_flag(sk, SOCK_DEAD); 665 sock_set_flag(sk, SOCK_DESTROY); 666 break; 667 } 668 669 sock_orphan(sk); 670 out: 671 release_sock(sk); 672 sock_put(sk); 673 return 0; 674 } 675 676 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 677 { 678 struct sock *sk = sock->sk; 679 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 680 int len, i, rc = 0; 681 682 if (!sock_flag(sk, SOCK_ZAPPED) || 683 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 x25_sk(sk)->source_addr = addr->sx25_addr; 703 x25_insert_socket(sk); 704 sock_reset_flag(sk, SOCK_ZAPPED); 705 release_sock(sk); 706 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 707 out: 708 return rc; 709 } 710 711 static int x25_wait_for_connection_establishment(struct sock *sk) 712 { 713 DECLARE_WAITQUEUE(wait, current); 714 int rc; 715 716 add_wait_queue_exclusive(sk_sleep(sk), &wait); 717 for (;;) { 718 __set_current_state(TASK_INTERRUPTIBLE); 719 rc = -ERESTARTSYS; 720 if (signal_pending(current)) 721 break; 722 rc = sock_error(sk); 723 if (rc) { 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 sk->sk_state = TCP_CLOSE; 766 sock->state = SS_UNCONNECTED; 767 768 rc = -EINVAL; 769 if (addr_len != sizeof(struct sockaddr_x25) || 770 addr->sx25_family != AF_X25) 771 goto out; 772 773 rc = -ENETUNREACH; 774 rt = x25_get_route(&addr->sx25_addr); 775 if (!rt) 776 goto out; 777 778 x25->neighbour = x25_get_neigh(rt->dev); 779 if (!x25->neighbour) 780 goto out_put_route; 781 782 x25_limit_facilities(&x25->facilities, x25->neighbour); 783 784 x25->lci = x25_new_lci(x25->neighbour); 785 if (!x25->lci) 786 goto out_put_neigh; 787 788 rc = -EINVAL; 789 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 790 goto out_put_neigh; 791 792 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 793 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 794 795 x25->dest_addr = addr->sx25_addr; 796 797 /* Move to connecting socket, start sending Connect Requests */ 798 sock->state = SS_CONNECTING; 799 sk->sk_state = TCP_SYN_SENT; 800 801 x25->state = X25_STATE_1; 802 803 x25_write_internal(sk, X25_CALL_REQUEST); 804 805 x25_start_heartbeat(sk); 806 x25_start_t21timer(sk); 807 808 /* Now the loop */ 809 rc = -EINPROGRESS; 810 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 811 goto out_put_neigh; 812 813 rc = x25_wait_for_connection_establishment(sk); 814 if (rc) 815 goto out_put_neigh; 816 817 sock->state = SS_CONNECTED; 818 rc = 0; 819 out_put_neigh: 820 if (rc) 821 x25_neigh_put(x25->neighbour); 822 out_put_route: 823 x25_route_put(rt); 824 out: 825 release_sock(sk); 826 return rc; 827 } 828 829 static int x25_wait_for_data(struct sock *sk, long timeout) 830 { 831 DECLARE_WAITQUEUE(wait, current); 832 int rc = 0; 833 834 add_wait_queue_exclusive(sk_sleep(sk), &wait); 835 for (;;) { 836 __set_current_state(TASK_INTERRUPTIBLE); 837 if (sk->sk_shutdown & RCV_SHUTDOWN) 838 break; 839 rc = -ERESTARTSYS; 840 if (signal_pending(current)) 841 break; 842 rc = -EAGAIN; 843 if (!timeout) 844 break; 845 rc = 0; 846 if (skb_queue_empty(&sk->sk_receive_queue)) { 847 release_sock(sk); 848 timeout = schedule_timeout(timeout); 849 lock_sock(sk); 850 } else 851 break; 852 } 853 __set_current_state(TASK_RUNNING); 854 remove_wait_queue(sk_sleep(sk), &wait); 855 return rc; 856 } 857 858 static int x25_accept(struct socket *sock, struct socket *newsock, int flags, 859 bool kern) 860 { 861 struct sock *sk = sock->sk; 862 struct sock *newsk; 863 struct sk_buff *skb; 864 int rc = -EINVAL; 865 866 if (!sk) 867 goto out; 868 869 rc = -EOPNOTSUPP; 870 if (sk->sk_type != SOCK_SEQPACKET) 871 goto out; 872 873 lock_sock(sk); 874 rc = -EINVAL; 875 if (sk->sk_state != TCP_LISTEN) 876 goto out2; 877 878 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 879 if (rc) 880 goto out2; 881 skb = skb_dequeue(&sk->sk_receive_queue); 882 rc = -EINVAL; 883 if (!skb->sk) 884 goto out2; 885 newsk = skb->sk; 886 sock_graft(newsk, newsock); 887 888 /* Now attach up the new socket */ 889 skb->sk = NULL; 890 kfree_skb(skb); 891 sk->sk_ack_backlog--; 892 newsock->state = SS_CONNECTED; 893 rc = 0; 894 out2: 895 release_sock(sk); 896 out: 897 return rc; 898 } 899 900 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 901 int peer) 902 { 903 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 904 struct sock *sk = sock->sk; 905 struct x25_sock *x25 = x25_sk(sk); 906 int rc = 0; 907 908 if (peer) { 909 if (sk->sk_state != TCP_ESTABLISHED) { 910 rc = -ENOTCONN; 911 goto out; 912 } 913 sx25->sx25_addr = x25->dest_addr; 914 } else 915 sx25->sx25_addr = x25->source_addr; 916 917 sx25->sx25_family = AF_X25; 918 rc = sizeof(*sx25); 919 920 out: 921 return rc; 922 } 923 924 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 925 unsigned int lci) 926 { 927 struct sock *sk; 928 struct sock *make; 929 struct x25_sock *makex25; 930 struct x25_address source_addr, dest_addr; 931 struct x25_facilities facilities; 932 struct x25_dte_facilities dte_facilities; 933 int len, addr_len, rc; 934 935 /* 936 * Remove the LCI and frame type. 937 */ 938 skb_pull(skb, X25_STD_MIN_LEN); 939 940 /* 941 * Extract the X.25 addresses and convert them to ASCII strings, 942 * and remove them. 943 * 944 * Address block is mandatory in call request packets 945 */ 946 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 947 if (addr_len <= 0) 948 goto out_clear_request; 949 skb_pull(skb, addr_len); 950 951 /* 952 * Get the length of the facilities, skip past them for the moment 953 * get the call user data because this is needed to determine 954 * the correct listener 955 * 956 * Facilities length is mandatory in call request packets 957 */ 958 if (!pskb_may_pull(skb, 1)) 959 goto out_clear_request; 960 len = skb->data[0] + 1; 961 if (!pskb_may_pull(skb, len)) 962 goto out_clear_request; 963 skb_pull(skb,len); 964 965 /* 966 * Ensure that the amount of call user data is valid. 967 */ 968 if (skb->len > X25_MAX_CUD_LEN) 969 goto out_clear_request; 970 971 /* 972 * Get all the call user data so it can be used in 973 * x25_find_listener and skb_copy_from_linear_data up ahead. 974 */ 975 if (!pskb_may_pull(skb, skb->len)) 976 goto out_clear_request; 977 978 /* 979 * Find a listener for the particular address/cud pair. 980 */ 981 sk = x25_find_listener(&source_addr,skb); 982 skb_push(skb,len); 983 984 if (sk != NULL && sk_acceptq_is_full(sk)) { 985 goto out_sock_put; 986 } 987 988 /* 989 * We dont have any listeners for this incoming call. 990 * Try forwarding it. 991 */ 992 if (sk == NULL) { 993 skb_push(skb, addr_len + X25_STD_MIN_LEN); 994 if (sysctl_x25_forward && 995 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 996 { 997 /* Call was forwarded, dont process it any more */ 998 kfree_skb(skb); 999 rc = 1; 1000 goto out; 1001 } else { 1002 /* No listeners, can't forward, clear the call */ 1003 goto out_clear_request; 1004 } 1005 } 1006 1007 /* 1008 * Try to reach a compromise on the requested facilities. 1009 */ 1010 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1011 if (len == -1) 1012 goto out_sock_put; 1013 1014 /* 1015 * current neighbour/link might impose additional limits 1016 * on certain facilties 1017 */ 1018 1019 x25_limit_facilities(&facilities, nb); 1020 1021 /* 1022 * Try to create a new socket. 1023 */ 1024 make = x25_make_new(sk); 1025 if (!make) 1026 goto out_sock_put; 1027 1028 /* 1029 * Remove the facilities 1030 */ 1031 skb_pull(skb, len); 1032 1033 skb->sk = make; 1034 make->sk_state = TCP_ESTABLISHED; 1035 1036 makex25 = x25_sk(make); 1037 makex25->lci = lci; 1038 makex25->dest_addr = dest_addr; 1039 makex25->source_addr = source_addr; 1040 makex25->neighbour = nb; 1041 makex25->facilities = facilities; 1042 makex25->dte_facilities= dte_facilities; 1043 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1044 /* ensure no reverse facil on accept */ 1045 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1046 /* ensure no calling address extension on accept */ 1047 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1048 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1049 1050 /* Normally all calls are accepted immediately */ 1051 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1052 x25_write_internal(make, X25_CALL_ACCEPTED); 1053 makex25->state = X25_STATE_3; 1054 } 1055 1056 /* 1057 * Incoming Call User Data. 1058 */ 1059 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1060 makex25->calluserdata.cudlength = skb->len; 1061 1062 sk->sk_ack_backlog++; 1063 1064 x25_insert_socket(make); 1065 1066 skb_queue_head(&sk->sk_receive_queue, skb); 1067 1068 x25_start_heartbeat(make); 1069 1070 if (!sock_flag(sk, SOCK_DEAD)) 1071 sk->sk_data_ready(sk); 1072 rc = 1; 1073 sock_put(sk); 1074 out: 1075 return rc; 1076 out_sock_put: 1077 sock_put(sk); 1078 out_clear_request: 1079 rc = 0; 1080 x25_transmit_clear_request(nb, lci, 0x01); 1081 goto out; 1082 } 1083 1084 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 1085 { 1086 struct sock *sk = sock->sk; 1087 struct x25_sock *x25 = x25_sk(sk); 1088 DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name); 1089 struct sockaddr_x25 sx25; 1090 struct sk_buff *skb; 1091 unsigned char *asmptr; 1092 int noblock = msg->msg_flags & MSG_DONTWAIT; 1093 size_t size; 1094 int qbit = 0, rc = -EINVAL; 1095 1096 lock_sock(sk); 1097 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1098 goto out; 1099 1100 /* we currently don't support segmented records at the user interface */ 1101 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1102 goto out; 1103 1104 rc = -EADDRNOTAVAIL; 1105 if (sock_flag(sk, SOCK_ZAPPED)) 1106 goto out; 1107 1108 rc = -EPIPE; 1109 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1110 send_sig(SIGPIPE, current, 0); 1111 goto out; 1112 } 1113 1114 rc = -ENETUNREACH; 1115 if (!x25->neighbour) 1116 goto out; 1117 1118 if (usx25) { 1119 rc = -EINVAL; 1120 if (msg->msg_namelen < sizeof(sx25)) 1121 goto out; 1122 memcpy(&sx25, usx25, sizeof(sx25)); 1123 rc = -EISCONN; 1124 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1125 goto out; 1126 rc = -EINVAL; 1127 if (sx25.sx25_family != AF_X25) 1128 goto out; 1129 } else { 1130 /* 1131 * FIXME 1003.1g - if the socket is like this because 1132 * it has become closed (not started closed) we ought 1133 * to SIGPIPE, EPIPE; 1134 */ 1135 rc = -ENOTCONN; 1136 if (sk->sk_state != TCP_ESTABLISHED) 1137 goto out; 1138 1139 sx25.sx25_family = AF_X25; 1140 sx25.sx25_addr = x25->dest_addr; 1141 } 1142 1143 /* Sanity check the packet size */ 1144 if (len > 65535) { 1145 rc = -EMSGSIZE; 1146 goto out; 1147 } 1148 1149 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1150 1151 /* Build a packet */ 1152 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1153 1154 if ((msg->msg_flags & MSG_OOB) && len > 32) 1155 len = 32; 1156 1157 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1158 1159 release_sock(sk); 1160 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1161 lock_sock(sk); 1162 if (!skb) 1163 goto out; 1164 X25_SKB_CB(skb)->flags = msg->msg_flags; 1165 1166 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1167 1168 /* 1169 * Put the data on the end 1170 */ 1171 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1172 1173 skb_reset_transport_header(skb); 1174 skb_put(skb, len); 1175 1176 rc = memcpy_from_msg(skb_transport_header(skb), msg, len); 1177 if (rc) 1178 goto out_kfree_skb; 1179 1180 /* 1181 * If the Q BIT Include socket option is in force, the first 1182 * byte of the user data is the logical value of the Q Bit. 1183 */ 1184 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1185 if (!pskb_may_pull(skb, 1)) 1186 goto out_kfree_skb; 1187 1188 qbit = skb->data[0]; 1189 skb_pull(skb, 1); 1190 } 1191 1192 /* 1193 * Push down the X.25 header 1194 */ 1195 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1196 1197 if (msg->msg_flags & MSG_OOB) { 1198 if (x25->neighbour->extended) { 1199 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1200 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1201 *asmptr++ = (x25->lci >> 0) & 0xFF; 1202 *asmptr++ = X25_INTERRUPT; 1203 } else { 1204 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1205 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1206 *asmptr++ = (x25->lci >> 0) & 0xFF; 1207 *asmptr++ = X25_INTERRUPT; 1208 } 1209 } else { 1210 if (x25->neighbour->extended) { 1211 /* Build an Extended X.25 header */ 1212 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1213 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1214 *asmptr++ = (x25->lci >> 0) & 0xFF; 1215 *asmptr++ = X25_DATA; 1216 *asmptr++ = X25_DATA; 1217 } else { 1218 /* Build an Standard X.25 header */ 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_DATA; 1223 } 1224 1225 if (qbit) 1226 skb->data[0] |= X25_Q_BIT; 1227 } 1228 1229 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1230 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1231 1232 rc = -ENOTCONN; 1233 if (sk->sk_state != TCP_ESTABLISHED) 1234 goto out_kfree_skb; 1235 1236 if (msg->msg_flags & MSG_OOB) 1237 skb_queue_tail(&x25->interrupt_out_queue, skb); 1238 else { 1239 rc = x25_output(sk, skb); 1240 len = rc; 1241 if (rc < 0) 1242 kfree_skb(skb); 1243 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1244 len++; 1245 } 1246 1247 x25_kick(sk); 1248 rc = len; 1249 out: 1250 release_sock(sk); 1251 return rc; 1252 out_kfree_skb: 1253 kfree_skb(skb); 1254 goto out; 1255 } 1256 1257 1258 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 1259 int flags) 1260 { 1261 struct sock *sk = sock->sk; 1262 struct x25_sock *x25 = x25_sk(sk); 1263 DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name); 1264 size_t copied; 1265 int qbit, header_len; 1266 struct sk_buff *skb; 1267 unsigned char *asmptr; 1268 int rc = -ENOTCONN; 1269 1270 lock_sock(sk); 1271 1272 if (x25->neighbour == NULL) 1273 goto out; 1274 1275 header_len = x25->neighbour->extended ? 1276 X25_EXT_MIN_LEN : X25_STD_MIN_LEN; 1277 1278 /* 1279 * This works for seqpacket too. The receiver has ordered the queue for 1280 * us! We do one quick check first though 1281 */ 1282 if (sk->sk_state != TCP_ESTABLISHED) 1283 goto out; 1284 1285 if (flags & MSG_OOB) { 1286 rc = -EINVAL; 1287 if (sock_flag(sk, SOCK_URGINLINE) || 1288 !skb_peek(&x25->interrupt_in_queue)) 1289 goto out; 1290 1291 skb = skb_dequeue(&x25->interrupt_in_queue); 1292 1293 if (!pskb_may_pull(skb, X25_STD_MIN_LEN)) 1294 goto out_free_dgram; 1295 1296 skb_pull(skb, X25_STD_MIN_LEN); 1297 1298 /* 1299 * No Q bit information on Interrupt data. 1300 */ 1301 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1302 asmptr = skb_push(skb, 1); 1303 *asmptr = 0x00; 1304 } 1305 1306 msg->msg_flags |= MSG_OOB; 1307 } else { 1308 /* Now we can treat all alike */ 1309 release_sock(sk); 1310 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1311 flags & MSG_DONTWAIT, &rc); 1312 lock_sock(sk); 1313 if (!skb) 1314 goto out; 1315 1316 if (!pskb_may_pull(skb, header_len)) 1317 goto out_free_dgram; 1318 1319 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1320 1321 skb_pull(skb, header_len); 1322 1323 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1324 asmptr = skb_push(skb, 1); 1325 *asmptr = qbit; 1326 } 1327 } 1328 1329 skb_reset_transport_header(skb); 1330 copied = skb->len; 1331 1332 if (copied > size) { 1333 copied = size; 1334 msg->msg_flags |= MSG_TRUNC; 1335 } 1336 1337 /* Currently, each datagram always contains a complete record */ 1338 msg->msg_flags |= MSG_EOR; 1339 1340 rc = skb_copy_datagram_msg(skb, 0, msg, copied); 1341 if (rc) 1342 goto out_free_dgram; 1343 1344 if (sx25) { 1345 sx25->sx25_family = AF_X25; 1346 sx25->sx25_addr = x25->dest_addr; 1347 msg->msg_namelen = sizeof(*sx25); 1348 } 1349 1350 x25_check_rbuf(sk); 1351 rc = copied; 1352 out_free_dgram: 1353 skb_free_datagram(sk, skb); 1354 out: 1355 release_sock(sk); 1356 return rc; 1357 } 1358 1359 1360 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1361 { 1362 struct sock *sk = sock->sk; 1363 struct x25_sock *x25 = x25_sk(sk); 1364 void __user *argp = (void __user *)arg; 1365 int rc; 1366 1367 switch (cmd) { 1368 case TIOCOUTQ: { 1369 int amount; 1370 1371 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1372 if (amount < 0) 1373 amount = 0; 1374 rc = put_user(amount, (unsigned int __user *)argp); 1375 break; 1376 } 1377 1378 case TIOCINQ: { 1379 struct sk_buff *skb; 1380 int amount = 0; 1381 /* 1382 * These two are safe on a single CPU system as 1383 * only user tasks fiddle here 1384 */ 1385 lock_sock(sk); 1386 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1387 amount = skb->len; 1388 release_sock(sk); 1389 rc = put_user(amount, (unsigned int __user *)argp); 1390 break; 1391 } 1392 1393 case SIOCGSTAMP: 1394 rc = -EINVAL; 1395 if (sk) 1396 rc = sock_get_timestamp(sk, 1397 (struct timeval __user *)argp); 1398 break; 1399 case SIOCGSTAMPNS: 1400 rc = -EINVAL; 1401 if (sk) 1402 rc = sock_get_timestampns(sk, 1403 (struct timespec __user *)argp); 1404 break; 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 struct sock *sk = sock->sk; 1677 1678 int rc = -ENOIOCTLCMD; 1679 1680 switch(cmd) { 1681 case TIOCOUTQ: 1682 case TIOCINQ: 1683 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1684 break; 1685 case SIOCGSTAMP: 1686 rc = -EINVAL; 1687 if (sk) 1688 rc = compat_sock_get_timestamp(sk, 1689 (struct timeval __user*)argp); 1690 break; 1691 case SIOCGSTAMPNS: 1692 rc = -EINVAL; 1693 if (sk) 1694 rc = compat_sock_get_timestampns(sk, 1695 (struct timespec __user*)argp); 1696 break; 1697 case SIOCGIFADDR: 1698 case SIOCSIFADDR: 1699 case SIOCGIFDSTADDR: 1700 case SIOCSIFDSTADDR: 1701 case SIOCGIFBRDADDR: 1702 case SIOCSIFBRDADDR: 1703 case SIOCGIFNETMASK: 1704 case SIOCSIFNETMASK: 1705 case SIOCGIFMETRIC: 1706 case SIOCSIFMETRIC: 1707 rc = -EINVAL; 1708 break; 1709 case SIOCADDRT: 1710 case SIOCDELRT: 1711 rc = -EPERM; 1712 if (!capable(CAP_NET_ADMIN)) 1713 break; 1714 rc = x25_route_ioctl(cmd, argp); 1715 break; 1716 case SIOCX25GSUBSCRIP: 1717 rc = compat_x25_subscr_ioctl(cmd, argp); 1718 break; 1719 case SIOCX25SSUBSCRIP: 1720 rc = -EPERM; 1721 if (!capable(CAP_NET_ADMIN)) 1722 break; 1723 rc = compat_x25_subscr_ioctl(cmd, argp); 1724 break; 1725 case SIOCX25GFACILITIES: 1726 case SIOCX25SFACILITIES: 1727 case SIOCX25GDTEFACILITIES: 1728 case SIOCX25SDTEFACILITIES: 1729 case SIOCX25GCALLUSERDATA: 1730 case SIOCX25SCALLUSERDATA: 1731 case SIOCX25GCAUSEDIAG: 1732 case SIOCX25SCAUSEDIAG: 1733 case SIOCX25SCUDMATCHLEN: 1734 case SIOCX25CALLACCPTAPPRV: 1735 case SIOCX25SENDCALLACCPT: 1736 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1737 break; 1738 default: 1739 rc = -ENOIOCTLCMD; 1740 break; 1741 } 1742 return rc; 1743 } 1744 #endif 1745 1746 static const struct proto_ops x25_proto_ops = { 1747 .family = AF_X25, 1748 .owner = THIS_MODULE, 1749 .release = x25_release, 1750 .bind = x25_bind, 1751 .connect = x25_connect, 1752 .socketpair = sock_no_socketpair, 1753 .accept = x25_accept, 1754 .getname = x25_getname, 1755 .poll = datagram_poll, 1756 .ioctl = x25_ioctl, 1757 #ifdef CONFIG_COMPAT 1758 .compat_ioctl = compat_x25_ioctl, 1759 #endif 1760 .listen = x25_listen, 1761 .shutdown = sock_no_shutdown, 1762 .setsockopt = x25_setsockopt, 1763 .getsockopt = x25_getsockopt, 1764 .sendmsg = x25_sendmsg, 1765 .recvmsg = x25_recvmsg, 1766 .mmap = sock_no_mmap, 1767 .sendpage = sock_no_sendpage, 1768 }; 1769 1770 static struct packet_type x25_packet_type __read_mostly = { 1771 .type = cpu_to_be16(ETH_P_X25), 1772 .func = x25_lapb_receive_frame, 1773 }; 1774 1775 static struct notifier_block x25_dev_notifier = { 1776 .notifier_call = x25_device_event, 1777 }; 1778 1779 void x25_kill_by_neigh(struct x25_neigh *nb) 1780 { 1781 struct sock *s; 1782 1783 write_lock_bh(&x25_list_lock); 1784 1785 sk_for_each(s, &x25_list) 1786 if (x25_sk(s)->neighbour == nb) 1787 x25_disconnect(s, ENETUNREACH, 0, 0); 1788 1789 write_unlock_bh(&x25_list_lock); 1790 1791 /* Remove any related forwards */ 1792 x25_clear_forward_by_dev(nb->dev); 1793 } 1794 1795 static int __init x25_init(void) 1796 { 1797 int rc; 1798 1799 rc = proto_register(&x25_proto, 0); 1800 if (rc) 1801 goto out; 1802 1803 rc = sock_register(&x25_family_ops); 1804 if (rc) 1805 goto out_proto; 1806 1807 dev_add_pack(&x25_packet_type); 1808 1809 rc = register_netdevice_notifier(&x25_dev_notifier); 1810 if (rc) 1811 goto out_sock; 1812 1813 rc = x25_register_sysctl(); 1814 if (rc) 1815 goto out_dev; 1816 1817 rc = x25_proc_init(); 1818 if (rc) 1819 goto out_sysctl; 1820 1821 pr_info("Linux Version 0.2\n"); 1822 1823 out: 1824 return rc; 1825 out_sysctl: 1826 x25_unregister_sysctl(); 1827 out_dev: 1828 unregister_netdevice_notifier(&x25_dev_notifier); 1829 out_sock: 1830 dev_remove_pack(&x25_packet_type); 1831 sock_unregister(AF_X25); 1832 out_proto: 1833 proto_unregister(&x25_proto); 1834 goto out; 1835 } 1836 module_init(x25_init); 1837 1838 static void __exit x25_exit(void) 1839 { 1840 x25_proc_exit(); 1841 x25_link_free(); 1842 x25_route_free(); 1843 1844 x25_unregister_sysctl(); 1845 1846 unregister_netdevice_notifier(&x25_dev_notifier); 1847 1848 dev_remove_pack(&x25_packet_type); 1849 1850 sock_unregister(AF_X25); 1851 proto_unregister(&x25_proto); 1852 } 1853 module_exit(x25_exit); 1854 1855 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1856 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1857 MODULE_LICENSE("GPL"); 1858 MODULE_ALIAS_NETPROTO(PF_X25); 1859