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 #include <linux/module.h> 39 #include <linux/capability.h> 40 #include <linux/errno.h> 41 #include <linux/kernel.h> 42 #include <linux/sched.h> 43 #include <linux/smp_lock.h> 44 #include <linux/timer.h> 45 #include <linux/string.h> 46 #include <linux/net.h> 47 #include <linux/netdevice.h> 48 #include <linux/if_arp.h> 49 #include <linux/skbuff.h> 50 #include <net/sock.h> 51 #include <net/tcp_states.h> 52 #include <asm/uaccess.h> 53 #include <linux/fcntl.h> 54 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 55 #include <linux/notifier.h> 56 #include <linux/init.h> 57 #include <linux/compat.h> 58 59 #include <net/x25.h> 60 #include <net/compat.h> 61 62 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 63 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 64 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 65 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 66 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 67 int sysctl_x25_forward = 0; 68 69 HLIST_HEAD(x25_list); 70 DEFINE_RWLOCK(x25_list_lock); 71 72 static const struct proto_ops x25_proto_ops; 73 74 static struct x25_address null_x25_address = {" "}; 75 76 #ifdef CONFIG_COMPAT 77 struct compat_x25_subscrip_struct { 78 char device[200-sizeof(compat_ulong_t)]; 79 compat_ulong_t global_facil_mask; 80 compat_uint_t extended; 81 }; 82 #endif 83 84 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 85 struct x25_address *calling_addr) 86 { 87 unsigned int called_len, calling_len; 88 char *called, *calling; 89 unsigned int i; 90 91 called_len = (*p >> 0) & 0x0F; 92 calling_len = (*p >> 4) & 0x0F; 93 94 called = called_addr->x25_addr; 95 calling = calling_addr->x25_addr; 96 p++; 97 98 for (i = 0; i < (called_len + calling_len); i++) { 99 if (i < called_len) { 100 if (i % 2 != 0) { 101 *called++ = ((*p >> 0) & 0x0F) + '0'; 102 p++; 103 } else { 104 *called++ = ((*p >> 4) & 0x0F) + '0'; 105 } 106 } else { 107 if (i % 2 != 0) { 108 *calling++ = ((*p >> 0) & 0x0F) + '0'; 109 p++; 110 } else { 111 *calling++ = ((*p >> 4) & 0x0F) + '0'; 112 } 113 } 114 } 115 116 *called = *calling = '\0'; 117 118 return 1 + (called_len + calling_len + 1) / 2; 119 } 120 121 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 122 struct x25_address *calling_addr) 123 { 124 unsigned int called_len, calling_len; 125 char *called, *calling; 126 int i; 127 128 called = called_addr->x25_addr; 129 calling = calling_addr->x25_addr; 130 131 called_len = strlen(called); 132 calling_len = strlen(calling); 133 134 *p++ = (calling_len << 4) | (called_len << 0); 135 136 for (i = 0; i < (called_len + calling_len); i++) { 137 if (i < called_len) { 138 if (i % 2 != 0) { 139 *p |= (*called++ - '0') << 0; 140 p++; 141 } else { 142 *p = 0x00; 143 *p |= (*called++ - '0') << 4; 144 } 145 } else { 146 if (i % 2 != 0) { 147 *p |= (*calling++ - '0') << 0; 148 p++; 149 } else { 150 *p = 0x00; 151 *p |= (*calling++ - '0') << 4; 152 } 153 } 154 } 155 156 return 1 + (called_len + calling_len + 1) / 2; 157 } 158 159 /* 160 * Socket removal during an interrupt is now safe. 161 */ 162 static void x25_remove_socket(struct sock *sk) 163 { 164 write_lock_bh(&x25_list_lock); 165 sk_del_node_init(sk); 166 write_unlock_bh(&x25_list_lock); 167 } 168 169 /* 170 * Kill all bound sockets on a dropped device. 171 */ 172 static void x25_kill_by_device(struct net_device *dev) 173 { 174 struct sock *s; 175 struct hlist_node *node; 176 177 write_lock_bh(&x25_list_lock); 178 179 sk_for_each(s, node, &x25_list) 180 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 181 x25_disconnect(s, ENETUNREACH, 0, 0); 182 183 write_unlock_bh(&x25_list_lock); 184 } 185 186 /* 187 * Handle device status changes. 188 */ 189 static int x25_device_event(struct notifier_block *this, unsigned long event, 190 void *ptr) 191 { 192 struct net_device *dev = ptr; 193 struct x25_neigh *nb; 194 195 if (!net_eq(dev_net(dev), &init_net)) 196 return NOTIFY_DONE; 197 198 if (dev->type == ARPHRD_X25 199 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE) 200 || dev->type == ARPHRD_ETHER 201 #endif 202 ) { 203 switch (event) { 204 case NETDEV_UP: 205 x25_link_device_up(dev); 206 break; 207 case NETDEV_GOING_DOWN: 208 nb = x25_get_neigh(dev); 209 if (nb) { 210 x25_terminate_link(nb); 211 x25_neigh_put(nb); 212 } 213 break; 214 case NETDEV_DOWN: 215 x25_kill_by_device(dev); 216 x25_route_device_down(dev); 217 x25_link_device_down(dev); 218 break; 219 } 220 } 221 222 return NOTIFY_DONE; 223 } 224 225 /* 226 * Add a socket to the bound sockets list. 227 */ 228 static void x25_insert_socket(struct sock *sk) 229 { 230 write_lock_bh(&x25_list_lock); 231 sk_add_node(sk, &x25_list); 232 write_unlock_bh(&x25_list_lock); 233 } 234 235 /* 236 * Find a socket that wants to accept the Call Request we just 237 * received. Check the full list for an address/cud match. 238 * If no cuds match return the next_best thing, an address match. 239 * Note: if a listening socket has cud set it must only get calls 240 * with matching cud. 241 */ 242 static struct sock *x25_find_listener(struct x25_address *addr, 243 struct sk_buff *skb) 244 { 245 struct sock *s; 246 struct sock *next_best; 247 struct hlist_node *node; 248 249 read_lock_bh(&x25_list_lock); 250 next_best = NULL; 251 252 sk_for_each(s, node, &x25_list) 253 if ((!strcmp(addr->x25_addr, 254 x25_sk(s)->source_addr.x25_addr) || 255 !strcmp(addr->x25_addr, 256 null_x25_address.x25_addr)) && 257 s->sk_state == TCP_LISTEN) { 258 /* 259 * Found a listening socket, now check the incoming 260 * call user data vs this sockets call user data 261 */ 262 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { 263 if((memcmp(x25_sk(s)->calluserdata.cuddata, 264 skb->data, 265 x25_sk(s)->cudmatchlength)) == 0) { 266 sock_hold(s); 267 goto found; 268 } 269 } else 270 next_best = s; 271 } 272 if (next_best) { 273 s = next_best; 274 sock_hold(s); 275 goto found; 276 } 277 s = NULL; 278 found: 279 read_unlock_bh(&x25_list_lock); 280 return s; 281 } 282 283 /* 284 * Find a connected X.25 socket given my LCI and neighbour. 285 */ 286 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 287 { 288 struct sock *s; 289 struct hlist_node *node; 290 291 sk_for_each(s, node, &x25_list) 292 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 293 sock_hold(s); 294 goto found; 295 } 296 s = NULL; 297 found: 298 return s; 299 } 300 301 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 302 { 303 struct sock *s; 304 305 read_lock_bh(&x25_list_lock); 306 s = __x25_find_socket(lci, nb); 307 read_unlock_bh(&x25_list_lock); 308 return s; 309 } 310 311 /* 312 * Find a unique LCI for a given device. 313 */ 314 static unsigned int x25_new_lci(struct x25_neigh *nb) 315 { 316 unsigned int lci = 1; 317 struct sock *sk; 318 319 read_lock_bh(&x25_list_lock); 320 321 while ((sk = __x25_find_socket(lci, nb)) != NULL) { 322 sock_put(sk); 323 if (++lci == 4096) { 324 lci = 0; 325 break; 326 } 327 } 328 329 read_unlock_bh(&x25_list_lock); 330 return lci; 331 } 332 333 /* 334 * Deferred destroy. 335 */ 336 static void __x25_destroy_socket(struct sock *); 337 338 /* 339 * handler for deferred kills. 340 */ 341 static void x25_destroy_timer(unsigned long data) 342 { 343 x25_destroy_socket_from_timer((struct sock *)data); 344 } 345 346 /* 347 * This is called from user mode and the timers. Thus it protects itself 348 * against interrupt users but doesn't worry about being called during 349 * work. Once it is removed from the queue no interrupt or bottom half 350 * will touch it and we are (fairly 8-) ) safe. 351 * Not static as it's used by the timer 352 */ 353 static void __x25_destroy_socket(struct sock *sk) 354 { 355 struct sk_buff *skb; 356 357 x25_stop_heartbeat(sk); 358 x25_stop_timer(sk); 359 360 x25_remove_socket(sk); 361 x25_clear_queues(sk); /* Flush the queues */ 362 363 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 364 if (skb->sk != sk) { /* A pending connection */ 365 /* 366 * Queue the unaccepted socket for death 367 */ 368 sock_set_flag(skb->sk, SOCK_DEAD); 369 x25_start_heartbeat(skb->sk); 370 x25_sk(skb->sk)->state = X25_STATE_0; 371 } 372 373 kfree_skb(skb); 374 } 375 376 if (sk_has_allocations(sk)) { 377 /* Defer: outstanding buffers */ 378 sk->sk_timer.expires = jiffies + 10 * HZ; 379 sk->sk_timer.function = x25_destroy_timer; 380 sk->sk_timer.data = (unsigned long)sk; 381 add_timer(&sk->sk_timer); 382 } else { 383 /* drop last reference so sock_put will free */ 384 __sock_put(sk); 385 } 386 } 387 388 void x25_destroy_socket_from_timer(struct sock *sk) 389 { 390 sock_hold(sk); 391 bh_lock_sock(sk); 392 __x25_destroy_socket(sk); 393 bh_unlock_sock(sk); 394 sock_put(sk); 395 } 396 397 static void x25_destroy_socket(struct sock *sk) 398 { 399 sock_hold(sk); 400 lock_sock(sk); 401 __x25_destroy_socket(sk); 402 release_sock(sk); 403 sock_put(sk); 404 } 405 406 /* 407 * Handling for system calls applied via the various interfaces to a 408 * X.25 socket object. 409 */ 410 411 static int x25_setsockopt(struct socket *sock, int level, int optname, 412 char __user *optval, int optlen) 413 { 414 int opt; 415 struct sock *sk = sock->sk; 416 int rc = -ENOPROTOOPT; 417 418 if (level != SOL_X25 || optname != X25_QBITINCL) 419 goto out; 420 421 rc = -EINVAL; 422 if (optlen < sizeof(int)) 423 goto out; 424 425 rc = -EFAULT; 426 if (get_user(opt, (int __user *)optval)) 427 goto out; 428 429 x25_sk(sk)->qbitincl = !!opt; 430 rc = 0; 431 out: 432 return rc; 433 } 434 435 static int x25_getsockopt(struct socket *sock, int level, int optname, 436 char __user *optval, int __user *optlen) 437 { 438 struct sock *sk = sock->sk; 439 int val, len, rc = -ENOPROTOOPT; 440 441 if (level != SOL_X25 || optname != X25_QBITINCL) 442 goto out; 443 444 rc = -EFAULT; 445 if (get_user(len, optlen)) 446 goto out; 447 448 len = min_t(unsigned int, len, sizeof(int)); 449 450 rc = -EINVAL; 451 if (len < 0) 452 goto out; 453 454 rc = -EFAULT; 455 if (put_user(len, optlen)) 456 goto out; 457 458 val = x25_sk(sk)->qbitincl; 459 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 460 out: 461 return rc; 462 } 463 464 static int x25_listen(struct socket *sock, int backlog) 465 { 466 struct sock *sk = sock->sk; 467 int rc = -EOPNOTSUPP; 468 469 if (sk->sk_state != TCP_LISTEN) { 470 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 471 sk->sk_max_ack_backlog = backlog; 472 sk->sk_state = TCP_LISTEN; 473 rc = 0; 474 } 475 476 return rc; 477 } 478 479 static struct proto x25_proto = { 480 .name = "X25", 481 .owner = THIS_MODULE, 482 .obj_size = sizeof(struct x25_sock), 483 }; 484 485 static struct sock *x25_alloc_socket(struct net *net) 486 { 487 struct x25_sock *x25; 488 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto); 489 490 if (!sk) 491 goto out; 492 493 sock_init_data(NULL, sk); 494 495 x25 = x25_sk(sk); 496 skb_queue_head_init(&x25->ack_queue); 497 skb_queue_head_init(&x25->fragment_queue); 498 skb_queue_head_init(&x25->interrupt_in_queue); 499 skb_queue_head_init(&x25->interrupt_out_queue); 500 out: 501 return sk; 502 } 503 504 static int x25_create(struct net *net, struct socket *sock, int protocol) 505 { 506 struct sock *sk; 507 struct x25_sock *x25; 508 int rc = -ESOCKTNOSUPPORT; 509 510 if (net != &init_net) 511 return -EAFNOSUPPORT; 512 513 if (sock->type != SOCK_SEQPACKET || protocol) 514 goto out; 515 516 rc = -ENOMEM; 517 if ((sk = x25_alloc_socket(net)) == NULL) 518 goto out; 519 520 x25 = x25_sk(sk); 521 522 sock_init_data(sock, sk); 523 524 x25_init_timers(sk); 525 526 sock->ops = &x25_proto_ops; 527 sk->sk_protocol = protocol; 528 sk->sk_backlog_rcv = x25_backlog_rcv; 529 530 x25->t21 = sysctl_x25_call_request_timeout; 531 x25->t22 = sysctl_x25_reset_request_timeout; 532 x25->t23 = sysctl_x25_clear_request_timeout; 533 x25->t2 = sysctl_x25_ack_holdback_timeout; 534 x25->state = X25_STATE_0; 535 x25->cudmatchlength = 0; 536 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */ 537 /* on call accept */ 538 539 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 540 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 541 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 542 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 543 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT; 544 x25->facilities.reverse = X25_DEFAULT_REVERSE; 545 x25->dte_facilities.calling_len = 0; 546 x25->dte_facilities.called_len = 0; 547 memset(x25->dte_facilities.called_ae, '\0', 548 sizeof(x25->dte_facilities.called_ae)); 549 memset(x25->dte_facilities.calling_ae, '\0', 550 sizeof(x25->dte_facilities.calling_ae)); 551 552 rc = 0; 553 out: 554 return rc; 555 } 556 557 static struct sock *x25_make_new(struct sock *osk) 558 { 559 struct sock *sk = NULL; 560 struct x25_sock *x25, *ox25; 561 562 if (osk->sk_type != SOCK_SEQPACKET) 563 goto out; 564 565 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL) 566 goto out; 567 568 x25 = x25_sk(sk); 569 570 sk->sk_type = osk->sk_type; 571 sk->sk_priority = osk->sk_priority; 572 sk->sk_protocol = osk->sk_protocol; 573 sk->sk_rcvbuf = osk->sk_rcvbuf; 574 sk->sk_sndbuf = osk->sk_sndbuf; 575 sk->sk_state = TCP_ESTABLISHED; 576 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 577 sock_copy_flags(sk, osk); 578 579 ox25 = x25_sk(osk); 580 x25->t21 = ox25->t21; 581 x25->t22 = ox25->t22; 582 x25->t23 = ox25->t23; 583 x25->t2 = ox25->t2; 584 x25->facilities = ox25->facilities; 585 x25->qbitincl = ox25->qbitincl; 586 x25->dte_facilities = ox25->dte_facilities; 587 x25->cudmatchlength = ox25->cudmatchlength; 588 x25->accptapprv = ox25->accptapprv; 589 590 x25_init_timers(sk); 591 out: 592 return sk; 593 } 594 595 static int x25_release(struct socket *sock) 596 { 597 struct sock *sk = sock->sk; 598 struct x25_sock *x25; 599 600 if (!sk) 601 goto out; 602 603 x25 = x25_sk(sk); 604 605 switch (x25->state) { 606 607 case X25_STATE_0: 608 case X25_STATE_2: 609 x25_disconnect(sk, 0, 0, 0); 610 x25_destroy_socket(sk); 611 goto out; 612 613 case X25_STATE_1: 614 case X25_STATE_3: 615 case X25_STATE_4: 616 x25_clear_queues(sk); 617 x25_write_internal(sk, X25_CLEAR_REQUEST); 618 x25_start_t23timer(sk); 619 x25->state = X25_STATE_2; 620 sk->sk_state = TCP_CLOSE; 621 sk->sk_shutdown |= SEND_SHUTDOWN; 622 sk->sk_state_change(sk); 623 sock_set_flag(sk, SOCK_DEAD); 624 sock_set_flag(sk, SOCK_DESTROY); 625 break; 626 } 627 628 sock_orphan(sk); 629 out: 630 return 0; 631 } 632 633 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 634 { 635 struct sock *sk = sock->sk; 636 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 637 638 if (!sock_flag(sk, SOCK_ZAPPED) || 639 addr_len != sizeof(struct sockaddr_x25) || 640 addr->sx25_family != AF_X25) 641 return -EINVAL; 642 643 x25_sk(sk)->source_addr = addr->sx25_addr; 644 x25_insert_socket(sk); 645 sock_reset_flag(sk, SOCK_ZAPPED); 646 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 647 648 return 0; 649 } 650 651 static int x25_wait_for_connection_establishment(struct sock *sk) 652 { 653 DECLARE_WAITQUEUE(wait, current); 654 int rc; 655 656 add_wait_queue_exclusive(sk->sk_sleep, &wait); 657 for (;;) { 658 __set_current_state(TASK_INTERRUPTIBLE); 659 rc = -ERESTARTSYS; 660 if (signal_pending(current)) 661 break; 662 rc = sock_error(sk); 663 if (rc) { 664 sk->sk_socket->state = SS_UNCONNECTED; 665 break; 666 } 667 rc = 0; 668 if (sk->sk_state != TCP_ESTABLISHED) { 669 release_sock(sk); 670 schedule(); 671 lock_sock(sk); 672 } else 673 break; 674 } 675 __set_current_state(TASK_RUNNING); 676 remove_wait_queue(sk->sk_sleep, &wait); 677 return rc; 678 } 679 680 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 681 int addr_len, int flags) 682 { 683 struct sock *sk = sock->sk; 684 struct x25_sock *x25 = x25_sk(sk); 685 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 686 struct x25_route *rt; 687 int rc = 0; 688 689 lock_sock(sk); 690 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 691 sock->state = SS_CONNECTED; 692 goto out; /* Connect completed during a ERESTARTSYS event */ 693 } 694 695 rc = -ECONNREFUSED; 696 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 697 sock->state = SS_UNCONNECTED; 698 goto out; 699 } 700 701 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 702 if (sk->sk_state == TCP_ESTABLISHED) 703 goto out; 704 705 sk->sk_state = TCP_CLOSE; 706 sock->state = SS_UNCONNECTED; 707 708 rc = -EINVAL; 709 if (addr_len != sizeof(struct sockaddr_x25) || 710 addr->sx25_family != AF_X25) 711 goto out; 712 713 rc = -ENETUNREACH; 714 rt = x25_get_route(&addr->sx25_addr); 715 if (!rt) 716 goto out; 717 718 x25->neighbour = x25_get_neigh(rt->dev); 719 if (!x25->neighbour) 720 goto out_put_route; 721 722 x25_limit_facilities(&x25->facilities, x25->neighbour); 723 724 x25->lci = x25_new_lci(x25->neighbour); 725 if (!x25->lci) 726 goto out_put_neigh; 727 728 rc = -EINVAL; 729 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 730 goto out_put_neigh; 731 732 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 733 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 734 735 x25->dest_addr = addr->sx25_addr; 736 737 /* Move to connecting socket, start sending Connect Requests */ 738 sock->state = SS_CONNECTING; 739 sk->sk_state = TCP_SYN_SENT; 740 741 x25->state = X25_STATE_1; 742 743 x25_write_internal(sk, X25_CALL_REQUEST); 744 745 x25_start_heartbeat(sk); 746 x25_start_t21timer(sk); 747 748 /* Now the loop */ 749 rc = -EINPROGRESS; 750 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 751 goto out_put_neigh; 752 753 rc = x25_wait_for_connection_establishment(sk); 754 if (rc) 755 goto out_put_neigh; 756 757 sock->state = SS_CONNECTED; 758 rc = 0; 759 out_put_neigh: 760 if (rc) 761 x25_neigh_put(x25->neighbour); 762 out_put_route: 763 x25_route_put(rt); 764 out: 765 release_sock(sk); 766 return rc; 767 } 768 769 static int x25_wait_for_data(struct sock *sk, long timeout) 770 { 771 DECLARE_WAITQUEUE(wait, current); 772 int rc = 0; 773 774 add_wait_queue_exclusive(sk->sk_sleep, &wait); 775 for (;;) { 776 __set_current_state(TASK_INTERRUPTIBLE); 777 if (sk->sk_shutdown & RCV_SHUTDOWN) 778 break; 779 rc = -ERESTARTSYS; 780 if (signal_pending(current)) 781 break; 782 rc = -EAGAIN; 783 if (!timeout) 784 break; 785 rc = 0; 786 if (skb_queue_empty(&sk->sk_receive_queue)) { 787 release_sock(sk); 788 timeout = schedule_timeout(timeout); 789 lock_sock(sk); 790 } else 791 break; 792 } 793 __set_current_state(TASK_RUNNING); 794 remove_wait_queue(sk->sk_sleep, &wait); 795 return rc; 796 } 797 798 static int x25_accept(struct socket *sock, struct socket *newsock, int flags) 799 { 800 struct sock *sk = sock->sk; 801 struct sock *newsk; 802 struct sk_buff *skb; 803 int rc = -EINVAL; 804 805 if (!sk || sk->sk_state != TCP_LISTEN) 806 goto out; 807 808 rc = -EOPNOTSUPP; 809 if (sk->sk_type != SOCK_SEQPACKET) 810 goto out; 811 812 lock_sock(sk); 813 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 814 if (rc) 815 goto out2; 816 skb = skb_dequeue(&sk->sk_receive_queue); 817 rc = -EINVAL; 818 if (!skb->sk) 819 goto out2; 820 newsk = skb->sk; 821 sock_graft(newsk, newsock); 822 823 /* Now attach up the new socket */ 824 skb->sk = NULL; 825 kfree_skb(skb); 826 sk->sk_ack_backlog--; 827 newsock->state = SS_CONNECTED; 828 rc = 0; 829 out2: 830 release_sock(sk); 831 out: 832 return rc; 833 } 834 835 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 836 int *uaddr_len, int peer) 837 { 838 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 839 struct sock *sk = sock->sk; 840 struct x25_sock *x25 = x25_sk(sk); 841 842 if (peer) { 843 if (sk->sk_state != TCP_ESTABLISHED) 844 return -ENOTCONN; 845 sx25->sx25_addr = x25->dest_addr; 846 } else 847 sx25->sx25_addr = x25->source_addr; 848 849 sx25->sx25_family = AF_X25; 850 *uaddr_len = sizeof(*sx25); 851 852 return 0; 853 } 854 855 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 856 unsigned int lci) 857 { 858 struct sock *sk; 859 struct sock *make; 860 struct x25_sock *makex25; 861 struct x25_address source_addr, dest_addr; 862 struct x25_facilities facilities; 863 struct x25_dte_facilities dte_facilities; 864 int len, addr_len, rc; 865 866 /* 867 * Remove the LCI and frame type. 868 */ 869 skb_pull(skb, X25_STD_MIN_LEN); 870 871 /* 872 * Extract the X.25 addresses and convert them to ASCII strings, 873 * and remove them. 874 */ 875 addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr); 876 skb_pull(skb, addr_len); 877 878 /* 879 * Get the length of the facilities, skip past them for the moment 880 * get the call user data because this is needed to determine 881 * the correct listener 882 */ 883 len = skb->data[0] + 1; 884 skb_pull(skb,len); 885 886 /* 887 * Find a listener for the particular address/cud pair. 888 */ 889 sk = x25_find_listener(&source_addr,skb); 890 skb_push(skb,len); 891 892 if (sk != NULL && sk_acceptq_is_full(sk)) { 893 goto out_sock_put; 894 } 895 896 /* 897 * We dont have any listeners for this incoming call. 898 * Try forwarding it. 899 */ 900 if (sk == NULL) { 901 skb_push(skb, addr_len + X25_STD_MIN_LEN); 902 if (sysctl_x25_forward && 903 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 904 { 905 /* Call was forwarded, dont process it any more */ 906 kfree_skb(skb); 907 rc = 1; 908 goto out; 909 } else { 910 /* No listeners, can't forward, clear the call */ 911 goto out_clear_request; 912 } 913 } 914 915 /* 916 * Try to reach a compromise on the requested facilities. 917 */ 918 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 919 if (len == -1) 920 goto out_sock_put; 921 922 /* 923 * current neighbour/link might impose additional limits 924 * on certain facilties 925 */ 926 927 x25_limit_facilities(&facilities, nb); 928 929 /* 930 * Try to create a new socket. 931 */ 932 make = x25_make_new(sk); 933 if (!make) 934 goto out_sock_put; 935 936 /* 937 * Remove the facilities 938 */ 939 skb_pull(skb, len); 940 941 skb->sk = make; 942 make->sk_state = TCP_ESTABLISHED; 943 944 makex25 = x25_sk(make); 945 makex25->lci = lci; 946 makex25->dest_addr = dest_addr; 947 makex25->source_addr = source_addr; 948 makex25->neighbour = nb; 949 makex25->facilities = facilities; 950 makex25->dte_facilities= dte_facilities; 951 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 952 /* ensure no reverse facil on accept */ 953 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 954 /* ensure no calling address extension on accept */ 955 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 956 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 957 958 /* Normally all calls are accepted immediatly */ 959 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) { 960 x25_write_internal(make, X25_CALL_ACCEPTED); 961 makex25->state = X25_STATE_3; 962 } 963 964 /* 965 * Incoming Call User Data. 966 */ 967 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 968 makex25->calluserdata.cudlength = skb->len; 969 970 sk->sk_ack_backlog++; 971 972 x25_insert_socket(make); 973 974 skb_queue_head(&sk->sk_receive_queue, skb); 975 976 x25_start_heartbeat(make); 977 978 if (!sock_flag(sk, SOCK_DEAD)) 979 sk->sk_data_ready(sk, skb->len); 980 rc = 1; 981 sock_put(sk); 982 out: 983 return rc; 984 out_sock_put: 985 sock_put(sk); 986 out_clear_request: 987 rc = 0; 988 x25_transmit_clear_request(nb, lci, 0x01); 989 goto out; 990 } 991 992 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, 993 struct msghdr *msg, size_t len) 994 { 995 struct sock *sk = sock->sk; 996 struct x25_sock *x25 = x25_sk(sk); 997 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name; 998 struct sockaddr_x25 sx25; 999 struct sk_buff *skb; 1000 unsigned char *asmptr; 1001 int noblock = msg->msg_flags & MSG_DONTWAIT; 1002 size_t size; 1003 int qbit = 0, rc = -EINVAL; 1004 1005 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1006 goto out; 1007 1008 /* we currently don't support segmented records at the user interface */ 1009 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1010 goto out; 1011 1012 rc = -EADDRNOTAVAIL; 1013 if (sock_flag(sk, SOCK_ZAPPED)) 1014 goto out; 1015 1016 rc = -EPIPE; 1017 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1018 send_sig(SIGPIPE, current, 0); 1019 goto out; 1020 } 1021 1022 rc = -ENETUNREACH; 1023 if (!x25->neighbour) 1024 goto out; 1025 1026 if (usx25) { 1027 rc = -EINVAL; 1028 if (msg->msg_namelen < sizeof(sx25)) 1029 goto out; 1030 memcpy(&sx25, usx25, sizeof(sx25)); 1031 rc = -EISCONN; 1032 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1033 goto out; 1034 rc = -EINVAL; 1035 if (sx25.sx25_family != AF_X25) 1036 goto out; 1037 } else { 1038 /* 1039 * FIXME 1003.1g - if the socket is like this because 1040 * it has become closed (not started closed) we ought 1041 * to SIGPIPE, EPIPE; 1042 */ 1043 rc = -ENOTCONN; 1044 if (sk->sk_state != TCP_ESTABLISHED) 1045 goto out; 1046 1047 sx25.sx25_family = AF_X25; 1048 sx25.sx25_addr = x25->dest_addr; 1049 } 1050 1051 /* Sanity check the packet size */ 1052 if (len > 65535) { 1053 rc = -EMSGSIZE; 1054 goto out; 1055 } 1056 1057 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1058 1059 /* Build a packet */ 1060 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1061 1062 if ((msg->msg_flags & MSG_OOB) && len > 32) 1063 len = 32; 1064 1065 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1066 1067 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1068 if (!skb) 1069 goto out; 1070 X25_SKB_CB(skb)->flags = msg->msg_flags; 1071 1072 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1073 1074 /* 1075 * Put the data on the end 1076 */ 1077 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1078 1079 skb_reset_transport_header(skb); 1080 skb_put(skb, len); 1081 1082 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len); 1083 if (rc) 1084 goto out_kfree_skb; 1085 1086 /* 1087 * If the Q BIT Include socket option is in force, the first 1088 * byte of the user data is the logical value of the Q Bit. 1089 */ 1090 if (x25->qbitincl) { 1091 qbit = skb->data[0]; 1092 skb_pull(skb, 1); 1093 } 1094 1095 /* 1096 * Push down the X.25 header 1097 */ 1098 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1099 1100 if (msg->msg_flags & MSG_OOB) { 1101 if (x25->neighbour->extended) { 1102 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1103 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1104 *asmptr++ = (x25->lci >> 0) & 0xFF; 1105 *asmptr++ = X25_INTERRUPT; 1106 } else { 1107 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1108 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1109 *asmptr++ = (x25->lci >> 0) & 0xFF; 1110 *asmptr++ = X25_INTERRUPT; 1111 } 1112 } else { 1113 if (x25->neighbour->extended) { 1114 /* Build an Extended X.25 header */ 1115 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1116 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1117 *asmptr++ = (x25->lci >> 0) & 0xFF; 1118 *asmptr++ = X25_DATA; 1119 *asmptr++ = X25_DATA; 1120 } else { 1121 /* Build an Standard X.25 header */ 1122 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1123 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1124 *asmptr++ = (x25->lci >> 0) & 0xFF; 1125 *asmptr++ = X25_DATA; 1126 } 1127 1128 if (qbit) 1129 skb->data[0] |= X25_Q_BIT; 1130 } 1131 1132 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1133 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1134 1135 rc = -ENOTCONN; 1136 if (sk->sk_state != TCP_ESTABLISHED) 1137 goto out_kfree_skb; 1138 1139 if (msg->msg_flags & MSG_OOB) 1140 skb_queue_tail(&x25->interrupt_out_queue, skb); 1141 else { 1142 rc = x25_output(sk, skb); 1143 len = rc; 1144 if (rc < 0) 1145 kfree_skb(skb); 1146 else if (x25->qbitincl) 1147 len++; 1148 } 1149 1150 /* 1151 * lock_sock() is currently only used to serialize this x25_kick() 1152 * against input-driven x25_kick() calls. It currently only blocks 1153 * incoming packets for this socket and does not protect against 1154 * any other socket state changes and is not called from anywhere 1155 * else. As x25_kick() cannot block and as long as all socket 1156 * operations are BKL-wrapped, we don't need take to care about 1157 * purging the backlog queue in x25_release(). 1158 * 1159 * Using lock_sock() to protect all socket operations entirely 1160 * (and making the whole x25 stack SMP aware) unfortunately would 1161 * require major changes to {send,recv}msg and skb allocation methods. 1162 * -> 2.5 ;) 1163 */ 1164 lock_sock(sk); 1165 x25_kick(sk); 1166 release_sock(sk); 1167 rc = len; 1168 out: 1169 return rc; 1170 out_kfree_skb: 1171 kfree_skb(skb); 1172 goto out; 1173 } 1174 1175 1176 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, 1177 struct msghdr *msg, size_t size, 1178 int flags) 1179 { 1180 struct sock *sk = sock->sk; 1181 struct x25_sock *x25 = x25_sk(sk); 1182 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; 1183 size_t copied; 1184 int qbit; 1185 struct sk_buff *skb; 1186 unsigned char *asmptr; 1187 int rc = -ENOTCONN; 1188 1189 /* 1190 * This works for seqpacket too. The receiver has ordered the queue for 1191 * us! We do one quick check first though 1192 */ 1193 if (sk->sk_state != TCP_ESTABLISHED) 1194 goto out; 1195 1196 if (flags & MSG_OOB) { 1197 rc = -EINVAL; 1198 if (sock_flag(sk, SOCK_URGINLINE) || 1199 !skb_peek(&x25->interrupt_in_queue)) 1200 goto out; 1201 1202 skb = skb_dequeue(&x25->interrupt_in_queue); 1203 1204 skb_pull(skb, X25_STD_MIN_LEN); 1205 1206 /* 1207 * No Q bit information on Interrupt data. 1208 */ 1209 if (x25->qbitincl) { 1210 asmptr = skb_push(skb, 1); 1211 *asmptr = 0x00; 1212 } 1213 1214 msg->msg_flags |= MSG_OOB; 1215 } else { 1216 /* Now we can treat all alike */ 1217 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1218 flags & MSG_DONTWAIT, &rc); 1219 if (!skb) 1220 goto out; 1221 1222 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1223 1224 skb_pull(skb, x25->neighbour->extended ? 1225 X25_EXT_MIN_LEN : X25_STD_MIN_LEN); 1226 1227 if (x25->qbitincl) { 1228 asmptr = skb_push(skb, 1); 1229 *asmptr = qbit; 1230 } 1231 } 1232 1233 skb_reset_transport_header(skb); 1234 copied = skb->len; 1235 1236 if (copied > size) { 1237 copied = size; 1238 msg->msg_flags |= MSG_TRUNC; 1239 } 1240 1241 /* Currently, each datagram always contains a complete record */ 1242 msg->msg_flags |= MSG_EOR; 1243 1244 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1245 if (rc) 1246 goto out_free_dgram; 1247 1248 if (sx25) { 1249 sx25->sx25_family = AF_X25; 1250 sx25->sx25_addr = x25->dest_addr; 1251 } 1252 1253 msg->msg_namelen = sizeof(struct sockaddr_x25); 1254 1255 lock_sock(sk); 1256 x25_check_rbuf(sk); 1257 release_sock(sk); 1258 rc = copied; 1259 out_free_dgram: 1260 skb_free_datagram(sk, skb); 1261 out: 1262 return rc; 1263 } 1264 1265 1266 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1267 { 1268 struct sock *sk = sock->sk; 1269 struct x25_sock *x25 = x25_sk(sk); 1270 void __user *argp = (void __user *)arg; 1271 int rc; 1272 1273 switch (cmd) { 1274 case TIOCOUTQ: { 1275 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1276 1277 if (amount < 0) 1278 amount = 0; 1279 rc = put_user(amount, (unsigned int __user *)argp); 1280 break; 1281 } 1282 1283 case TIOCINQ: { 1284 struct sk_buff *skb; 1285 int amount = 0; 1286 /* 1287 * These two are safe on a single CPU system as 1288 * only user tasks fiddle here 1289 */ 1290 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1291 amount = skb->len; 1292 rc = put_user(amount, (unsigned int __user *)argp); 1293 break; 1294 } 1295 1296 case SIOCGSTAMP: 1297 rc = -EINVAL; 1298 if (sk) 1299 rc = sock_get_timestamp(sk, 1300 (struct timeval __user *)argp); 1301 break; 1302 case SIOCGSTAMPNS: 1303 rc = -EINVAL; 1304 if (sk) 1305 rc = sock_get_timestampns(sk, 1306 (struct timespec __user *)argp); 1307 break; 1308 case SIOCGIFADDR: 1309 case SIOCSIFADDR: 1310 case SIOCGIFDSTADDR: 1311 case SIOCSIFDSTADDR: 1312 case SIOCGIFBRDADDR: 1313 case SIOCSIFBRDADDR: 1314 case SIOCGIFNETMASK: 1315 case SIOCSIFNETMASK: 1316 case SIOCGIFMETRIC: 1317 case SIOCSIFMETRIC: 1318 rc = -EINVAL; 1319 break; 1320 case SIOCADDRT: 1321 case SIOCDELRT: 1322 rc = -EPERM; 1323 if (!capable(CAP_NET_ADMIN)) 1324 break; 1325 rc = x25_route_ioctl(cmd, argp); 1326 break; 1327 case SIOCX25GSUBSCRIP: 1328 rc = x25_subscr_ioctl(cmd, argp); 1329 break; 1330 case SIOCX25SSUBSCRIP: 1331 rc = -EPERM; 1332 if (!capable(CAP_NET_ADMIN)) 1333 break; 1334 rc = x25_subscr_ioctl(cmd, argp); 1335 break; 1336 case SIOCX25GFACILITIES: { 1337 struct x25_facilities fac = x25->facilities; 1338 rc = copy_to_user(argp, &fac, 1339 sizeof(fac)) ? -EFAULT : 0; 1340 break; 1341 } 1342 1343 case SIOCX25SFACILITIES: { 1344 struct x25_facilities facilities; 1345 rc = -EFAULT; 1346 if (copy_from_user(&facilities, argp, 1347 sizeof(facilities))) 1348 break; 1349 rc = -EINVAL; 1350 if (sk->sk_state != TCP_LISTEN && 1351 sk->sk_state != TCP_CLOSE) 1352 break; 1353 if (facilities.pacsize_in < X25_PS16 || 1354 facilities.pacsize_in > X25_PS4096) 1355 break; 1356 if (facilities.pacsize_out < X25_PS16 || 1357 facilities.pacsize_out > X25_PS4096) 1358 break; 1359 if (facilities.winsize_in < 1 || 1360 facilities.winsize_in > 127) 1361 break; 1362 if (facilities.throughput < 0x03 || 1363 facilities.throughput > 0xDD) 1364 break; 1365 if (facilities.reverse && 1366 (facilities.reverse | 0x81)!= 0x81) 1367 break; 1368 x25->facilities = facilities; 1369 rc = 0; 1370 break; 1371 } 1372 1373 case SIOCX25GDTEFACILITIES: { 1374 rc = copy_to_user(argp, &x25->dte_facilities, 1375 sizeof(x25->dte_facilities)); 1376 if (rc) 1377 rc = -EFAULT; 1378 break; 1379 } 1380 1381 case SIOCX25SDTEFACILITIES: { 1382 struct x25_dte_facilities dtefacs; 1383 rc = -EFAULT; 1384 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1385 break; 1386 rc = -EINVAL; 1387 if (sk->sk_state != TCP_LISTEN && 1388 sk->sk_state != TCP_CLOSE) 1389 break; 1390 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1391 break; 1392 if (dtefacs.calling_ae == NULL) 1393 break; 1394 if (dtefacs.called_len > X25_MAX_AE_LEN) 1395 break; 1396 if (dtefacs.called_ae == NULL) 1397 break; 1398 x25->dte_facilities = dtefacs; 1399 rc = 0; 1400 break; 1401 } 1402 1403 case SIOCX25GCALLUSERDATA: { 1404 struct x25_calluserdata cud = x25->calluserdata; 1405 rc = copy_to_user(argp, &cud, 1406 sizeof(cud)) ? -EFAULT : 0; 1407 break; 1408 } 1409 1410 case SIOCX25SCALLUSERDATA: { 1411 struct x25_calluserdata calluserdata; 1412 1413 rc = -EFAULT; 1414 if (copy_from_user(&calluserdata, argp, 1415 sizeof(calluserdata))) 1416 break; 1417 rc = -EINVAL; 1418 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1419 break; 1420 x25->calluserdata = calluserdata; 1421 rc = 0; 1422 break; 1423 } 1424 1425 case SIOCX25GCAUSEDIAG: { 1426 struct x25_causediag causediag; 1427 causediag = x25->causediag; 1428 rc = copy_to_user(argp, &causediag, 1429 sizeof(causediag)) ? -EFAULT : 0; 1430 break; 1431 } 1432 1433 case SIOCX25SCUDMATCHLEN: { 1434 struct x25_subaddr sub_addr; 1435 rc = -EINVAL; 1436 if(sk->sk_state != TCP_CLOSE) 1437 break; 1438 rc = -EFAULT; 1439 if (copy_from_user(&sub_addr, argp, 1440 sizeof(sub_addr))) 1441 break; 1442 rc = -EINVAL; 1443 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1444 break; 1445 x25->cudmatchlength = sub_addr.cudmatchlength; 1446 rc = 0; 1447 break; 1448 } 1449 1450 case SIOCX25CALLACCPTAPPRV: { 1451 rc = -EINVAL; 1452 if (sk->sk_state != TCP_CLOSE) 1453 break; 1454 x25->accptapprv = X25_ALLOW_ACCPT_APPRV; 1455 rc = 0; 1456 break; 1457 } 1458 1459 case SIOCX25SENDCALLACCPT: { 1460 rc = -EINVAL; 1461 if (sk->sk_state != TCP_ESTABLISHED) 1462 break; 1463 if (x25->accptapprv) /* must call accptapprv above */ 1464 break; 1465 x25_write_internal(sk, X25_CALL_ACCEPTED); 1466 x25->state = X25_STATE_3; 1467 rc = 0; 1468 break; 1469 } 1470 1471 default: 1472 rc = -ENOIOCTLCMD; 1473 break; 1474 } 1475 1476 return rc; 1477 } 1478 1479 static struct net_proto_family x25_family_ops = { 1480 .family = AF_X25, 1481 .create = x25_create, 1482 .owner = THIS_MODULE, 1483 }; 1484 1485 #ifdef CONFIG_COMPAT 1486 static int compat_x25_subscr_ioctl(unsigned int cmd, 1487 struct compat_x25_subscrip_struct __user *x25_subscr32) 1488 { 1489 struct compat_x25_subscrip_struct x25_subscr; 1490 struct x25_neigh *nb; 1491 struct net_device *dev; 1492 int rc = -EINVAL; 1493 1494 rc = -EFAULT; 1495 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1496 goto out; 1497 1498 rc = -EINVAL; 1499 dev = x25_dev_get(x25_subscr.device); 1500 if (dev == NULL) 1501 goto out; 1502 1503 nb = x25_get_neigh(dev); 1504 if (nb == NULL) 1505 goto out_dev_put; 1506 1507 dev_put(dev); 1508 1509 if (cmd == SIOCX25GSUBSCRIP) { 1510 x25_subscr.extended = nb->extended; 1511 x25_subscr.global_facil_mask = nb->global_facil_mask; 1512 rc = copy_to_user(x25_subscr32, &x25_subscr, 1513 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1514 } else { 1515 rc = -EINVAL; 1516 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1517 rc = 0; 1518 nb->extended = x25_subscr.extended; 1519 nb->global_facil_mask = x25_subscr.global_facil_mask; 1520 } 1521 } 1522 x25_neigh_put(nb); 1523 out: 1524 return rc; 1525 out_dev_put: 1526 dev_put(dev); 1527 goto out; 1528 } 1529 1530 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1531 unsigned long arg) 1532 { 1533 void __user *argp = compat_ptr(arg); 1534 struct sock *sk = sock->sk; 1535 1536 int rc = -ENOIOCTLCMD; 1537 1538 switch(cmd) { 1539 case TIOCOUTQ: 1540 case TIOCINQ: 1541 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1542 break; 1543 case SIOCGSTAMP: 1544 rc = -EINVAL; 1545 if (sk) 1546 rc = compat_sock_get_timestamp(sk, 1547 (struct timeval __user*)argp); 1548 break; 1549 case SIOCGSTAMPNS: 1550 rc = -EINVAL; 1551 if (sk) 1552 rc = compat_sock_get_timestampns(sk, 1553 (struct timespec __user*)argp); 1554 break; 1555 case SIOCGIFADDR: 1556 case SIOCSIFADDR: 1557 case SIOCGIFDSTADDR: 1558 case SIOCSIFDSTADDR: 1559 case SIOCGIFBRDADDR: 1560 case SIOCSIFBRDADDR: 1561 case SIOCGIFNETMASK: 1562 case SIOCSIFNETMASK: 1563 case SIOCGIFMETRIC: 1564 case SIOCSIFMETRIC: 1565 rc = -EINVAL; 1566 break; 1567 case SIOCADDRT: 1568 case SIOCDELRT: 1569 rc = -EPERM; 1570 if (!capable(CAP_NET_ADMIN)) 1571 break; 1572 rc = x25_route_ioctl(cmd, argp); 1573 break; 1574 case SIOCX25GSUBSCRIP: 1575 rc = compat_x25_subscr_ioctl(cmd, argp); 1576 break; 1577 case SIOCX25SSUBSCRIP: 1578 rc = -EPERM; 1579 if (!capable(CAP_NET_ADMIN)) 1580 break; 1581 rc = compat_x25_subscr_ioctl(cmd, argp); 1582 break; 1583 case SIOCX25GFACILITIES: 1584 case SIOCX25SFACILITIES: 1585 case SIOCX25GDTEFACILITIES: 1586 case SIOCX25SDTEFACILITIES: 1587 case SIOCX25GCALLUSERDATA: 1588 case SIOCX25SCALLUSERDATA: 1589 case SIOCX25GCAUSEDIAG: 1590 case SIOCX25SCUDMATCHLEN: 1591 case SIOCX25CALLACCPTAPPRV: 1592 case SIOCX25SENDCALLACCPT: 1593 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1594 break; 1595 default: 1596 rc = -ENOIOCTLCMD; 1597 break; 1598 } 1599 return rc; 1600 } 1601 #endif 1602 1603 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = { 1604 .family = AF_X25, 1605 .owner = THIS_MODULE, 1606 .release = x25_release, 1607 .bind = x25_bind, 1608 .connect = x25_connect, 1609 .socketpair = sock_no_socketpair, 1610 .accept = x25_accept, 1611 .getname = x25_getname, 1612 .poll = datagram_poll, 1613 .ioctl = x25_ioctl, 1614 #ifdef CONFIG_COMPAT 1615 .compat_ioctl = compat_x25_ioctl, 1616 #endif 1617 .listen = x25_listen, 1618 .shutdown = sock_no_shutdown, 1619 .setsockopt = x25_setsockopt, 1620 .getsockopt = x25_getsockopt, 1621 .sendmsg = x25_sendmsg, 1622 .recvmsg = x25_recvmsg, 1623 .mmap = sock_no_mmap, 1624 .sendpage = sock_no_sendpage, 1625 }; 1626 1627 SOCKOPS_WRAP(x25_proto, AF_X25); 1628 1629 static struct packet_type x25_packet_type __read_mostly = { 1630 .type = cpu_to_be16(ETH_P_X25), 1631 .func = x25_lapb_receive_frame, 1632 }; 1633 1634 static struct notifier_block x25_dev_notifier = { 1635 .notifier_call = x25_device_event, 1636 }; 1637 1638 void x25_kill_by_neigh(struct x25_neigh *nb) 1639 { 1640 struct sock *s; 1641 struct hlist_node *node; 1642 1643 write_lock_bh(&x25_list_lock); 1644 1645 sk_for_each(s, node, &x25_list) 1646 if (x25_sk(s)->neighbour == nb) 1647 x25_disconnect(s, ENETUNREACH, 0, 0); 1648 1649 write_unlock_bh(&x25_list_lock); 1650 1651 /* Remove any related forwards */ 1652 x25_clear_forward_by_dev(nb->dev); 1653 } 1654 1655 static int __init x25_init(void) 1656 { 1657 int rc = proto_register(&x25_proto, 0); 1658 1659 if (rc != 0) 1660 goto out; 1661 1662 sock_register(&x25_family_ops); 1663 1664 dev_add_pack(&x25_packet_type); 1665 1666 register_netdevice_notifier(&x25_dev_notifier); 1667 1668 printk(KERN_INFO "X.25 for Linux Version 0.2\n"); 1669 1670 #ifdef CONFIG_SYSCTL 1671 x25_register_sysctl(); 1672 #endif 1673 x25_proc_init(); 1674 out: 1675 return rc; 1676 } 1677 module_init(x25_init); 1678 1679 static void __exit x25_exit(void) 1680 { 1681 x25_proc_exit(); 1682 x25_link_free(); 1683 x25_route_free(); 1684 1685 #ifdef CONFIG_SYSCTL 1686 x25_unregister_sysctl(); 1687 #endif 1688 1689 unregister_netdevice_notifier(&x25_dev_notifier); 1690 1691 dev_remove_pack(&x25_packet_type); 1692 1693 sock_unregister(AF_X25); 1694 proto_unregister(&x25_proto); 1695 } 1696 module_exit(x25_exit); 1697 1698 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1699 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1700 MODULE_LICENSE("GPL"); 1701 MODULE_ALIAS_NETPROTO(PF_X25); 1702