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, unsigned int optlen) 413 { 414 int opt; 415 struct sock *sk = sock->sk; 416 int rc = -ENOPROTOOPT; 417 418 lock_kernel(); 419 if (level != SOL_X25 || optname != X25_QBITINCL) 420 goto out; 421 422 rc = -EINVAL; 423 if (optlen < sizeof(int)) 424 goto out; 425 426 rc = -EFAULT; 427 if (get_user(opt, (int __user *)optval)) 428 goto out; 429 430 x25_sk(sk)->qbitincl = !!opt; 431 rc = 0; 432 out: 433 unlock_kernel(); 434 return rc; 435 } 436 437 static int x25_getsockopt(struct socket *sock, int level, int optname, 438 char __user *optval, int __user *optlen) 439 { 440 struct sock *sk = sock->sk; 441 int val, len, rc = -ENOPROTOOPT; 442 443 lock_kernel(); 444 if (level != SOL_X25 || optname != X25_QBITINCL) 445 goto out; 446 447 rc = -EFAULT; 448 if (get_user(len, optlen)) 449 goto out; 450 451 len = min_t(unsigned int, len, sizeof(int)); 452 453 rc = -EINVAL; 454 if (len < 0) 455 goto out; 456 457 rc = -EFAULT; 458 if (put_user(len, optlen)) 459 goto out; 460 461 val = x25_sk(sk)->qbitincl; 462 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 463 out: 464 unlock_kernel(); 465 return rc; 466 } 467 468 static int x25_listen(struct socket *sock, int backlog) 469 { 470 struct sock *sk = sock->sk; 471 int rc = -EOPNOTSUPP; 472 473 lock_kernel(); 474 if (sk->sk_state != TCP_LISTEN) { 475 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 476 sk->sk_max_ack_backlog = backlog; 477 sk->sk_state = TCP_LISTEN; 478 rc = 0; 479 } 480 unlock_kernel(); 481 482 return rc; 483 } 484 485 static struct proto x25_proto = { 486 .name = "X25", 487 .owner = THIS_MODULE, 488 .obj_size = sizeof(struct x25_sock), 489 }; 490 491 static struct sock *x25_alloc_socket(struct net *net) 492 { 493 struct x25_sock *x25; 494 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto); 495 496 if (!sk) 497 goto out; 498 499 sock_init_data(NULL, sk); 500 501 x25 = x25_sk(sk); 502 skb_queue_head_init(&x25->ack_queue); 503 skb_queue_head_init(&x25->fragment_queue); 504 skb_queue_head_init(&x25->interrupt_in_queue); 505 skb_queue_head_init(&x25->interrupt_out_queue); 506 out: 507 return sk; 508 } 509 510 static int x25_create(struct net *net, struct socket *sock, int protocol, 511 int kern) 512 { 513 struct sock *sk; 514 struct x25_sock *x25; 515 int rc = -ESOCKTNOSUPPORT; 516 517 if (!net_eq(net, &init_net)) 518 return -EAFNOSUPPORT; 519 520 if (sock->type != SOCK_SEQPACKET || protocol) 521 goto out; 522 523 rc = -ENOMEM; 524 if ((sk = x25_alloc_socket(net)) == NULL) 525 goto out; 526 527 x25 = x25_sk(sk); 528 529 sock_init_data(sock, sk); 530 531 x25_init_timers(sk); 532 533 sock->ops = &x25_proto_ops; 534 sk->sk_protocol = protocol; 535 sk->sk_backlog_rcv = x25_backlog_rcv; 536 537 x25->t21 = sysctl_x25_call_request_timeout; 538 x25->t22 = sysctl_x25_reset_request_timeout; 539 x25->t23 = sysctl_x25_clear_request_timeout; 540 x25->t2 = sysctl_x25_ack_holdback_timeout; 541 x25->state = X25_STATE_0; 542 x25->cudmatchlength = 0; 543 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */ 544 /* on call accept */ 545 546 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 547 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 548 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 549 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 550 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT; 551 x25->facilities.reverse = X25_DEFAULT_REVERSE; 552 x25->dte_facilities.calling_len = 0; 553 x25->dte_facilities.called_len = 0; 554 memset(x25->dte_facilities.called_ae, '\0', 555 sizeof(x25->dte_facilities.called_ae)); 556 memset(x25->dte_facilities.calling_ae, '\0', 557 sizeof(x25->dte_facilities.calling_ae)); 558 559 rc = 0; 560 out: 561 return rc; 562 } 563 564 static struct sock *x25_make_new(struct sock *osk) 565 { 566 struct sock *sk = NULL; 567 struct x25_sock *x25, *ox25; 568 569 if (osk->sk_type != SOCK_SEQPACKET) 570 goto out; 571 572 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL) 573 goto out; 574 575 x25 = x25_sk(sk); 576 577 sk->sk_type = osk->sk_type; 578 sk->sk_priority = osk->sk_priority; 579 sk->sk_protocol = osk->sk_protocol; 580 sk->sk_rcvbuf = osk->sk_rcvbuf; 581 sk->sk_sndbuf = osk->sk_sndbuf; 582 sk->sk_state = TCP_ESTABLISHED; 583 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 584 sock_copy_flags(sk, osk); 585 586 ox25 = x25_sk(osk); 587 x25->t21 = ox25->t21; 588 x25->t22 = ox25->t22; 589 x25->t23 = ox25->t23; 590 x25->t2 = ox25->t2; 591 x25->facilities = ox25->facilities; 592 x25->qbitincl = ox25->qbitincl; 593 x25->dte_facilities = ox25->dte_facilities; 594 x25->cudmatchlength = ox25->cudmatchlength; 595 x25->accptapprv = ox25->accptapprv; 596 597 x25_init_timers(sk); 598 out: 599 return sk; 600 } 601 602 static int x25_release(struct socket *sock) 603 { 604 struct sock *sk = sock->sk; 605 struct x25_sock *x25; 606 607 lock_kernel(); 608 if (!sk) 609 goto out; 610 611 x25 = x25_sk(sk); 612 613 switch (x25->state) { 614 615 case X25_STATE_0: 616 case X25_STATE_2: 617 x25_disconnect(sk, 0, 0, 0); 618 x25_destroy_socket(sk); 619 goto out; 620 621 case X25_STATE_1: 622 case X25_STATE_3: 623 case X25_STATE_4: 624 x25_clear_queues(sk); 625 x25_write_internal(sk, X25_CLEAR_REQUEST); 626 x25_start_t23timer(sk); 627 x25->state = X25_STATE_2; 628 sk->sk_state = TCP_CLOSE; 629 sk->sk_shutdown |= SEND_SHUTDOWN; 630 sk->sk_state_change(sk); 631 sock_set_flag(sk, SOCK_DEAD); 632 sock_set_flag(sk, SOCK_DESTROY); 633 break; 634 } 635 636 sock_orphan(sk); 637 out: 638 unlock_kernel(); 639 return 0; 640 } 641 642 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 643 { 644 struct sock *sk = sock->sk; 645 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 646 int rc = 0; 647 648 lock_kernel(); 649 if (!sock_flag(sk, SOCK_ZAPPED) || 650 addr_len != sizeof(struct sockaddr_x25) || 651 addr->sx25_family != AF_X25) { 652 rc = -EINVAL; 653 goto out; 654 } 655 656 x25_sk(sk)->source_addr = addr->sx25_addr; 657 x25_insert_socket(sk); 658 sock_reset_flag(sk, SOCK_ZAPPED); 659 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 660 out: 661 unlock_kernel(); 662 return rc; 663 } 664 665 static int x25_wait_for_connection_establishment(struct sock *sk) 666 { 667 DECLARE_WAITQUEUE(wait, current); 668 int rc; 669 670 add_wait_queue_exclusive(sk->sk_sleep, &wait); 671 for (;;) { 672 __set_current_state(TASK_INTERRUPTIBLE); 673 rc = -ERESTARTSYS; 674 if (signal_pending(current)) 675 break; 676 rc = sock_error(sk); 677 if (rc) { 678 sk->sk_socket->state = SS_UNCONNECTED; 679 break; 680 } 681 rc = 0; 682 if (sk->sk_state != TCP_ESTABLISHED) { 683 release_sock(sk); 684 schedule(); 685 lock_sock(sk); 686 } else 687 break; 688 } 689 __set_current_state(TASK_RUNNING); 690 remove_wait_queue(sk->sk_sleep, &wait); 691 return rc; 692 } 693 694 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 695 int addr_len, int flags) 696 { 697 struct sock *sk = sock->sk; 698 struct x25_sock *x25 = x25_sk(sk); 699 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 700 struct x25_route *rt; 701 int rc = 0; 702 703 lock_kernel(); 704 lock_sock(sk); 705 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 706 sock->state = SS_CONNECTED; 707 goto out; /* Connect completed during a ERESTARTSYS event */ 708 } 709 710 rc = -ECONNREFUSED; 711 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 712 sock->state = SS_UNCONNECTED; 713 goto out; 714 } 715 716 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 717 if (sk->sk_state == TCP_ESTABLISHED) 718 goto out; 719 720 sk->sk_state = TCP_CLOSE; 721 sock->state = SS_UNCONNECTED; 722 723 rc = -EINVAL; 724 if (addr_len != sizeof(struct sockaddr_x25) || 725 addr->sx25_family != AF_X25) 726 goto out; 727 728 rc = -ENETUNREACH; 729 rt = x25_get_route(&addr->sx25_addr); 730 if (!rt) 731 goto out; 732 733 x25->neighbour = x25_get_neigh(rt->dev); 734 if (!x25->neighbour) 735 goto out_put_route; 736 737 x25_limit_facilities(&x25->facilities, x25->neighbour); 738 739 x25->lci = x25_new_lci(x25->neighbour); 740 if (!x25->lci) 741 goto out_put_neigh; 742 743 rc = -EINVAL; 744 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 745 goto out_put_neigh; 746 747 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 748 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 749 750 x25->dest_addr = addr->sx25_addr; 751 752 /* Move to connecting socket, start sending Connect Requests */ 753 sock->state = SS_CONNECTING; 754 sk->sk_state = TCP_SYN_SENT; 755 756 x25->state = X25_STATE_1; 757 758 x25_write_internal(sk, X25_CALL_REQUEST); 759 760 x25_start_heartbeat(sk); 761 x25_start_t21timer(sk); 762 763 /* Now the loop */ 764 rc = -EINPROGRESS; 765 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 766 goto out_put_neigh; 767 768 rc = x25_wait_for_connection_establishment(sk); 769 if (rc) 770 goto out_put_neigh; 771 772 sock->state = SS_CONNECTED; 773 rc = 0; 774 out_put_neigh: 775 if (rc) 776 x25_neigh_put(x25->neighbour); 777 out_put_route: 778 x25_route_put(rt); 779 out: 780 release_sock(sk); 781 unlock_kernel(); 782 return rc; 783 } 784 785 static int x25_wait_for_data(struct sock *sk, long timeout) 786 { 787 DECLARE_WAITQUEUE(wait, current); 788 int rc = 0; 789 790 add_wait_queue_exclusive(sk->sk_sleep, &wait); 791 for (;;) { 792 __set_current_state(TASK_INTERRUPTIBLE); 793 if (sk->sk_shutdown & RCV_SHUTDOWN) 794 break; 795 rc = -ERESTARTSYS; 796 if (signal_pending(current)) 797 break; 798 rc = -EAGAIN; 799 if (!timeout) 800 break; 801 rc = 0; 802 if (skb_queue_empty(&sk->sk_receive_queue)) { 803 release_sock(sk); 804 timeout = schedule_timeout(timeout); 805 lock_sock(sk); 806 } else 807 break; 808 } 809 __set_current_state(TASK_RUNNING); 810 remove_wait_queue(sk->sk_sleep, &wait); 811 return rc; 812 } 813 814 static int x25_accept(struct socket *sock, struct socket *newsock, int flags) 815 { 816 struct sock *sk = sock->sk; 817 struct sock *newsk; 818 struct sk_buff *skb; 819 int rc = -EINVAL; 820 821 lock_kernel(); 822 if (!sk || sk->sk_state != TCP_LISTEN) 823 goto out; 824 825 rc = -EOPNOTSUPP; 826 if (sk->sk_type != SOCK_SEQPACKET) 827 goto out; 828 829 lock_sock(sk); 830 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 831 if (rc) 832 goto out2; 833 skb = skb_dequeue(&sk->sk_receive_queue); 834 rc = -EINVAL; 835 if (!skb->sk) 836 goto out2; 837 newsk = skb->sk; 838 sock_graft(newsk, newsock); 839 840 /* Now attach up the new socket */ 841 skb->sk = NULL; 842 kfree_skb(skb); 843 sk->sk_ack_backlog--; 844 newsock->state = SS_CONNECTED; 845 rc = 0; 846 out2: 847 release_sock(sk); 848 out: 849 unlock_kernel(); 850 return rc; 851 } 852 853 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 854 int *uaddr_len, int peer) 855 { 856 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 857 struct sock *sk = sock->sk; 858 struct x25_sock *x25 = x25_sk(sk); 859 int rc = 0; 860 861 lock_kernel(); 862 if (peer) { 863 if (sk->sk_state != TCP_ESTABLISHED) { 864 rc = -ENOTCONN; 865 goto out; 866 } 867 sx25->sx25_addr = x25->dest_addr; 868 } else 869 sx25->sx25_addr = x25->source_addr; 870 871 sx25->sx25_family = AF_X25; 872 *uaddr_len = sizeof(*sx25); 873 874 out: 875 unlock_kernel(); 876 return rc; 877 } 878 879 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock, 880 poll_table *wait) 881 { 882 int rc; 883 884 lock_kernel(); 885 rc = datagram_poll(file, sock, wait); 886 unlock_kernel(); 887 888 return rc; 889 } 890 891 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 892 unsigned int lci) 893 { 894 struct sock *sk; 895 struct sock *make; 896 struct x25_sock *makex25; 897 struct x25_address source_addr, dest_addr; 898 struct x25_facilities facilities; 899 struct x25_dte_facilities dte_facilities; 900 int len, addr_len, rc; 901 902 /* 903 * Remove the LCI and frame type. 904 */ 905 skb_pull(skb, X25_STD_MIN_LEN); 906 907 /* 908 * Extract the X.25 addresses and convert them to ASCII strings, 909 * and remove them. 910 */ 911 addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr); 912 skb_pull(skb, addr_len); 913 914 /* 915 * Get the length of the facilities, skip past them for the moment 916 * get the call user data because this is needed to determine 917 * the correct listener 918 */ 919 len = skb->data[0] + 1; 920 skb_pull(skb,len); 921 922 /* 923 * Find a listener for the particular address/cud pair. 924 */ 925 sk = x25_find_listener(&source_addr,skb); 926 skb_push(skb,len); 927 928 if (sk != NULL && sk_acceptq_is_full(sk)) { 929 goto out_sock_put; 930 } 931 932 /* 933 * We dont have any listeners for this incoming call. 934 * Try forwarding it. 935 */ 936 if (sk == NULL) { 937 skb_push(skb, addr_len + X25_STD_MIN_LEN); 938 if (sysctl_x25_forward && 939 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 940 { 941 /* Call was forwarded, dont process it any more */ 942 kfree_skb(skb); 943 rc = 1; 944 goto out; 945 } else { 946 /* No listeners, can't forward, clear the call */ 947 goto out_clear_request; 948 } 949 } 950 951 /* 952 * Try to reach a compromise on the requested facilities. 953 */ 954 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 955 if (len == -1) 956 goto out_sock_put; 957 958 /* 959 * current neighbour/link might impose additional limits 960 * on certain facilties 961 */ 962 963 x25_limit_facilities(&facilities, nb); 964 965 /* 966 * Try to create a new socket. 967 */ 968 make = x25_make_new(sk); 969 if (!make) 970 goto out_sock_put; 971 972 /* 973 * Remove the facilities 974 */ 975 skb_pull(skb, len); 976 977 skb->sk = make; 978 make->sk_state = TCP_ESTABLISHED; 979 980 makex25 = x25_sk(make); 981 makex25->lci = lci; 982 makex25->dest_addr = dest_addr; 983 makex25->source_addr = source_addr; 984 makex25->neighbour = nb; 985 makex25->facilities = facilities; 986 makex25->dte_facilities= dte_facilities; 987 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 988 /* ensure no reverse facil on accept */ 989 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 990 /* ensure no calling address extension on accept */ 991 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 992 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 993 994 /* Normally all calls are accepted immediatly */ 995 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) { 996 x25_write_internal(make, X25_CALL_ACCEPTED); 997 makex25->state = X25_STATE_3; 998 } 999 1000 /* 1001 * Incoming Call User Data. 1002 */ 1003 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1004 makex25->calluserdata.cudlength = skb->len; 1005 1006 sk->sk_ack_backlog++; 1007 1008 x25_insert_socket(make); 1009 1010 skb_queue_head(&sk->sk_receive_queue, skb); 1011 1012 x25_start_heartbeat(make); 1013 1014 if (!sock_flag(sk, SOCK_DEAD)) 1015 sk->sk_data_ready(sk, skb->len); 1016 rc = 1; 1017 sock_put(sk); 1018 out: 1019 return rc; 1020 out_sock_put: 1021 sock_put(sk); 1022 out_clear_request: 1023 rc = 0; 1024 x25_transmit_clear_request(nb, lci, 0x01); 1025 goto out; 1026 } 1027 1028 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, 1029 struct msghdr *msg, size_t len) 1030 { 1031 struct sock *sk = sock->sk; 1032 struct x25_sock *x25 = x25_sk(sk); 1033 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name; 1034 struct sockaddr_x25 sx25; 1035 struct sk_buff *skb; 1036 unsigned char *asmptr; 1037 int noblock = msg->msg_flags & MSG_DONTWAIT; 1038 size_t size; 1039 int qbit = 0, rc = -EINVAL; 1040 1041 lock_kernel(); 1042 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1043 goto out; 1044 1045 /* we currently don't support segmented records at the user interface */ 1046 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1047 goto out; 1048 1049 rc = -EADDRNOTAVAIL; 1050 if (sock_flag(sk, SOCK_ZAPPED)) 1051 goto out; 1052 1053 rc = -EPIPE; 1054 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1055 send_sig(SIGPIPE, current, 0); 1056 goto out; 1057 } 1058 1059 rc = -ENETUNREACH; 1060 if (!x25->neighbour) 1061 goto out; 1062 1063 if (usx25) { 1064 rc = -EINVAL; 1065 if (msg->msg_namelen < sizeof(sx25)) 1066 goto out; 1067 memcpy(&sx25, usx25, sizeof(sx25)); 1068 rc = -EISCONN; 1069 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1070 goto out; 1071 rc = -EINVAL; 1072 if (sx25.sx25_family != AF_X25) 1073 goto out; 1074 } else { 1075 /* 1076 * FIXME 1003.1g - if the socket is like this because 1077 * it has become closed (not started closed) we ought 1078 * to SIGPIPE, EPIPE; 1079 */ 1080 rc = -ENOTCONN; 1081 if (sk->sk_state != TCP_ESTABLISHED) 1082 goto out; 1083 1084 sx25.sx25_family = AF_X25; 1085 sx25.sx25_addr = x25->dest_addr; 1086 } 1087 1088 /* Sanity check the packet size */ 1089 if (len > 65535) { 1090 rc = -EMSGSIZE; 1091 goto out; 1092 } 1093 1094 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1095 1096 /* Build a packet */ 1097 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1098 1099 if ((msg->msg_flags & MSG_OOB) && len > 32) 1100 len = 32; 1101 1102 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1103 1104 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1105 if (!skb) 1106 goto out; 1107 X25_SKB_CB(skb)->flags = msg->msg_flags; 1108 1109 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1110 1111 /* 1112 * Put the data on the end 1113 */ 1114 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1115 1116 skb_reset_transport_header(skb); 1117 skb_put(skb, len); 1118 1119 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len); 1120 if (rc) 1121 goto out_kfree_skb; 1122 1123 /* 1124 * If the Q BIT Include socket option is in force, the first 1125 * byte of the user data is the logical value of the Q Bit. 1126 */ 1127 if (x25->qbitincl) { 1128 qbit = skb->data[0]; 1129 skb_pull(skb, 1); 1130 } 1131 1132 /* 1133 * Push down the X.25 header 1134 */ 1135 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1136 1137 if (msg->msg_flags & MSG_OOB) { 1138 if (x25->neighbour->extended) { 1139 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1140 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1141 *asmptr++ = (x25->lci >> 0) & 0xFF; 1142 *asmptr++ = X25_INTERRUPT; 1143 } else { 1144 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1145 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1146 *asmptr++ = (x25->lci >> 0) & 0xFF; 1147 *asmptr++ = X25_INTERRUPT; 1148 } 1149 } else { 1150 if (x25->neighbour->extended) { 1151 /* Build an Extended X.25 header */ 1152 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1153 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1154 *asmptr++ = (x25->lci >> 0) & 0xFF; 1155 *asmptr++ = X25_DATA; 1156 *asmptr++ = X25_DATA; 1157 } else { 1158 /* Build an Standard X.25 header */ 1159 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1160 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1161 *asmptr++ = (x25->lci >> 0) & 0xFF; 1162 *asmptr++ = X25_DATA; 1163 } 1164 1165 if (qbit) 1166 skb->data[0] |= X25_Q_BIT; 1167 } 1168 1169 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1170 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1171 1172 rc = -ENOTCONN; 1173 if (sk->sk_state != TCP_ESTABLISHED) 1174 goto out_kfree_skb; 1175 1176 if (msg->msg_flags & MSG_OOB) 1177 skb_queue_tail(&x25->interrupt_out_queue, skb); 1178 else { 1179 rc = x25_output(sk, skb); 1180 len = rc; 1181 if (rc < 0) 1182 kfree_skb(skb); 1183 else if (x25->qbitincl) 1184 len++; 1185 } 1186 1187 /* 1188 * lock_sock() is currently only used to serialize this x25_kick() 1189 * against input-driven x25_kick() calls. It currently only blocks 1190 * incoming packets for this socket and does not protect against 1191 * any other socket state changes and is not called from anywhere 1192 * else. As x25_kick() cannot block and as long as all socket 1193 * operations are BKL-wrapped, we don't need take to care about 1194 * purging the backlog queue in x25_release(). 1195 * 1196 * Using lock_sock() to protect all socket operations entirely 1197 * (and making the whole x25 stack SMP aware) unfortunately would 1198 * require major changes to {send,recv}msg and skb allocation methods. 1199 * -> 2.5 ;) 1200 */ 1201 lock_sock(sk); 1202 x25_kick(sk); 1203 release_sock(sk); 1204 rc = len; 1205 out: 1206 unlock_kernel(); 1207 return rc; 1208 out_kfree_skb: 1209 kfree_skb(skb); 1210 goto out; 1211 } 1212 1213 1214 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, 1215 struct msghdr *msg, size_t size, 1216 int flags) 1217 { 1218 struct sock *sk = sock->sk; 1219 struct x25_sock *x25 = x25_sk(sk); 1220 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; 1221 size_t copied; 1222 int qbit; 1223 struct sk_buff *skb; 1224 unsigned char *asmptr; 1225 int rc = -ENOTCONN; 1226 1227 lock_kernel(); 1228 /* 1229 * This works for seqpacket too. The receiver has ordered the queue for 1230 * us! We do one quick check first though 1231 */ 1232 if (sk->sk_state != TCP_ESTABLISHED) 1233 goto out; 1234 1235 if (flags & MSG_OOB) { 1236 rc = -EINVAL; 1237 if (sock_flag(sk, SOCK_URGINLINE) || 1238 !skb_peek(&x25->interrupt_in_queue)) 1239 goto out; 1240 1241 skb = skb_dequeue(&x25->interrupt_in_queue); 1242 1243 skb_pull(skb, X25_STD_MIN_LEN); 1244 1245 /* 1246 * No Q bit information on Interrupt data. 1247 */ 1248 if (x25->qbitincl) { 1249 asmptr = skb_push(skb, 1); 1250 *asmptr = 0x00; 1251 } 1252 1253 msg->msg_flags |= MSG_OOB; 1254 } else { 1255 /* Now we can treat all alike */ 1256 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1257 flags & MSG_DONTWAIT, &rc); 1258 if (!skb) 1259 goto out; 1260 1261 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1262 1263 skb_pull(skb, x25->neighbour->extended ? 1264 X25_EXT_MIN_LEN : X25_STD_MIN_LEN); 1265 1266 if (x25->qbitincl) { 1267 asmptr = skb_push(skb, 1); 1268 *asmptr = qbit; 1269 } 1270 } 1271 1272 skb_reset_transport_header(skb); 1273 copied = skb->len; 1274 1275 if (copied > size) { 1276 copied = size; 1277 msg->msg_flags |= MSG_TRUNC; 1278 } 1279 1280 /* Currently, each datagram always contains a complete record */ 1281 msg->msg_flags |= MSG_EOR; 1282 1283 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1284 if (rc) 1285 goto out_free_dgram; 1286 1287 if (sx25) { 1288 sx25->sx25_family = AF_X25; 1289 sx25->sx25_addr = x25->dest_addr; 1290 } 1291 1292 msg->msg_namelen = sizeof(struct sockaddr_x25); 1293 1294 lock_sock(sk); 1295 x25_check_rbuf(sk); 1296 release_sock(sk); 1297 rc = copied; 1298 out_free_dgram: 1299 skb_free_datagram(sk, skb); 1300 out: 1301 unlock_kernel(); 1302 return rc; 1303 } 1304 1305 1306 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1307 { 1308 struct sock *sk = sock->sk; 1309 struct x25_sock *x25 = x25_sk(sk); 1310 void __user *argp = (void __user *)arg; 1311 int rc; 1312 1313 lock_kernel(); 1314 switch (cmd) { 1315 case TIOCOUTQ: { 1316 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1317 1318 if (amount < 0) 1319 amount = 0; 1320 rc = put_user(amount, (unsigned int __user *)argp); 1321 break; 1322 } 1323 1324 case TIOCINQ: { 1325 struct sk_buff *skb; 1326 int amount = 0; 1327 /* 1328 * These two are safe on a single CPU system as 1329 * only user tasks fiddle here 1330 */ 1331 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1332 amount = skb->len; 1333 rc = put_user(amount, (unsigned int __user *)argp); 1334 break; 1335 } 1336 1337 case SIOCGSTAMP: 1338 rc = -EINVAL; 1339 if (sk) 1340 rc = sock_get_timestamp(sk, 1341 (struct timeval __user *)argp); 1342 break; 1343 case SIOCGSTAMPNS: 1344 rc = -EINVAL; 1345 if (sk) 1346 rc = sock_get_timestampns(sk, 1347 (struct timespec __user *)argp); 1348 break; 1349 case SIOCGIFADDR: 1350 case SIOCSIFADDR: 1351 case SIOCGIFDSTADDR: 1352 case SIOCSIFDSTADDR: 1353 case SIOCGIFBRDADDR: 1354 case SIOCSIFBRDADDR: 1355 case SIOCGIFNETMASK: 1356 case SIOCSIFNETMASK: 1357 case SIOCGIFMETRIC: 1358 case SIOCSIFMETRIC: 1359 rc = -EINVAL; 1360 break; 1361 case SIOCADDRT: 1362 case SIOCDELRT: 1363 rc = -EPERM; 1364 if (!capable(CAP_NET_ADMIN)) 1365 break; 1366 rc = x25_route_ioctl(cmd, argp); 1367 break; 1368 case SIOCX25GSUBSCRIP: 1369 rc = x25_subscr_ioctl(cmd, argp); 1370 break; 1371 case SIOCX25SSUBSCRIP: 1372 rc = -EPERM; 1373 if (!capable(CAP_NET_ADMIN)) 1374 break; 1375 rc = x25_subscr_ioctl(cmd, argp); 1376 break; 1377 case SIOCX25GFACILITIES: { 1378 struct x25_facilities fac = x25->facilities; 1379 rc = copy_to_user(argp, &fac, 1380 sizeof(fac)) ? -EFAULT : 0; 1381 break; 1382 } 1383 1384 case SIOCX25SFACILITIES: { 1385 struct x25_facilities facilities; 1386 rc = -EFAULT; 1387 if (copy_from_user(&facilities, argp, 1388 sizeof(facilities))) 1389 break; 1390 rc = -EINVAL; 1391 if (sk->sk_state != TCP_LISTEN && 1392 sk->sk_state != TCP_CLOSE) 1393 break; 1394 if (facilities.pacsize_in < X25_PS16 || 1395 facilities.pacsize_in > X25_PS4096) 1396 break; 1397 if (facilities.pacsize_out < X25_PS16 || 1398 facilities.pacsize_out > X25_PS4096) 1399 break; 1400 if (facilities.winsize_in < 1 || 1401 facilities.winsize_in > 127) 1402 break; 1403 if (facilities.throughput < 0x03 || 1404 facilities.throughput > 0xDD) 1405 break; 1406 if (facilities.reverse && 1407 (facilities.reverse & 0x81) != 0x81) 1408 break; 1409 x25->facilities = facilities; 1410 rc = 0; 1411 break; 1412 } 1413 1414 case SIOCX25GDTEFACILITIES: { 1415 rc = copy_to_user(argp, &x25->dte_facilities, 1416 sizeof(x25->dte_facilities)); 1417 if (rc) 1418 rc = -EFAULT; 1419 break; 1420 } 1421 1422 case SIOCX25SDTEFACILITIES: { 1423 struct x25_dte_facilities dtefacs; 1424 rc = -EFAULT; 1425 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1426 break; 1427 rc = -EINVAL; 1428 if (sk->sk_state != TCP_LISTEN && 1429 sk->sk_state != TCP_CLOSE) 1430 break; 1431 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1432 break; 1433 if (dtefacs.calling_ae == NULL) 1434 break; 1435 if (dtefacs.called_len > X25_MAX_AE_LEN) 1436 break; 1437 if (dtefacs.called_ae == NULL) 1438 break; 1439 x25->dte_facilities = dtefacs; 1440 rc = 0; 1441 break; 1442 } 1443 1444 case SIOCX25GCALLUSERDATA: { 1445 struct x25_calluserdata cud = x25->calluserdata; 1446 rc = copy_to_user(argp, &cud, 1447 sizeof(cud)) ? -EFAULT : 0; 1448 break; 1449 } 1450 1451 case SIOCX25SCALLUSERDATA: { 1452 struct x25_calluserdata calluserdata; 1453 1454 rc = -EFAULT; 1455 if (copy_from_user(&calluserdata, argp, 1456 sizeof(calluserdata))) 1457 break; 1458 rc = -EINVAL; 1459 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1460 break; 1461 x25->calluserdata = calluserdata; 1462 rc = 0; 1463 break; 1464 } 1465 1466 case SIOCX25GCAUSEDIAG: { 1467 struct x25_causediag causediag; 1468 causediag = x25->causediag; 1469 rc = copy_to_user(argp, &causediag, 1470 sizeof(causediag)) ? -EFAULT : 0; 1471 break; 1472 } 1473 1474 case SIOCX25SCAUSEDIAG: { 1475 struct x25_causediag causediag; 1476 rc = -EFAULT; 1477 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1478 break; 1479 x25->causediag = causediag; 1480 rc = 0; 1481 break; 1482 1483 } 1484 1485 case SIOCX25SCUDMATCHLEN: { 1486 struct x25_subaddr sub_addr; 1487 rc = -EINVAL; 1488 if(sk->sk_state != TCP_CLOSE) 1489 break; 1490 rc = -EFAULT; 1491 if (copy_from_user(&sub_addr, argp, 1492 sizeof(sub_addr))) 1493 break; 1494 rc = -EINVAL; 1495 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1496 break; 1497 x25->cudmatchlength = sub_addr.cudmatchlength; 1498 rc = 0; 1499 break; 1500 } 1501 1502 case SIOCX25CALLACCPTAPPRV: { 1503 rc = -EINVAL; 1504 if (sk->sk_state != TCP_CLOSE) 1505 break; 1506 x25->accptapprv = X25_ALLOW_ACCPT_APPRV; 1507 rc = 0; 1508 break; 1509 } 1510 1511 case SIOCX25SENDCALLACCPT: { 1512 rc = -EINVAL; 1513 if (sk->sk_state != TCP_ESTABLISHED) 1514 break; 1515 if (x25->accptapprv) /* must call accptapprv above */ 1516 break; 1517 x25_write_internal(sk, X25_CALL_ACCEPTED); 1518 x25->state = X25_STATE_3; 1519 rc = 0; 1520 break; 1521 } 1522 1523 default: 1524 rc = -ENOIOCTLCMD; 1525 break; 1526 } 1527 unlock_kernel(); 1528 1529 return rc; 1530 } 1531 1532 static const struct net_proto_family x25_family_ops = { 1533 .family = AF_X25, 1534 .create = x25_create, 1535 .owner = THIS_MODULE, 1536 }; 1537 1538 #ifdef CONFIG_COMPAT 1539 static int compat_x25_subscr_ioctl(unsigned int cmd, 1540 struct compat_x25_subscrip_struct __user *x25_subscr32) 1541 { 1542 struct compat_x25_subscrip_struct x25_subscr; 1543 struct x25_neigh *nb; 1544 struct net_device *dev; 1545 int rc = -EINVAL; 1546 1547 rc = -EFAULT; 1548 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1549 goto out; 1550 1551 rc = -EINVAL; 1552 dev = x25_dev_get(x25_subscr.device); 1553 if (dev == NULL) 1554 goto out; 1555 1556 nb = x25_get_neigh(dev); 1557 if (nb == NULL) 1558 goto out_dev_put; 1559 1560 dev_put(dev); 1561 1562 if (cmd == SIOCX25GSUBSCRIP) { 1563 x25_subscr.extended = nb->extended; 1564 x25_subscr.global_facil_mask = nb->global_facil_mask; 1565 rc = copy_to_user(x25_subscr32, &x25_subscr, 1566 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1567 } else { 1568 rc = -EINVAL; 1569 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1570 rc = 0; 1571 nb->extended = x25_subscr.extended; 1572 nb->global_facil_mask = x25_subscr.global_facil_mask; 1573 } 1574 } 1575 x25_neigh_put(nb); 1576 out: 1577 return rc; 1578 out_dev_put: 1579 dev_put(dev); 1580 goto out; 1581 } 1582 1583 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1584 unsigned long arg) 1585 { 1586 void __user *argp = compat_ptr(arg); 1587 struct sock *sk = sock->sk; 1588 1589 int rc = -ENOIOCTLCMD; 1590 1591 switch(cmd) { 1592 case TIOCOUTQ: 1593 case TIOCINQ: 1594 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1595 break; 1596 case SIOCGSTAMP: 1597 rc = -EINVAL; 1598 lock_kernel(); 1599 if (sk) 1600 rc = compat_sock_get_timestamp(sk, 1601 (struct timeval __user*)argp); 1602 unlock_kernel(); 1603 break; 1604 case SIOCGSTAMPNS: 1605 rc = -EINVAL; 1606 lock_kernel(); 1607 if (sk) 1608 rc = compat_sock_get_timestampns(sk, 1609 (struct timespec __user*)argp); 1610 unlock_kernel(); 1611 break; 1612 case SIOCGIFADDR: 1613 case SIOCSIFADDR: 1614 case SIOCGIFDSTADDR: 1615 case SIOCSIFDSTADDR: 1616 case SIOCGIFBRDADDR: 1617 case SIOCSIFBRDADDR: 1618 case SIOCGIFNETMASK: 1619 case SIOCSIFNETMASK: 1620 case SIOCGIFMETRIC: 1621 case SIOCSIFMETRIC: 1622 rc = -EINVAL; 1623 break; 1624 case SIOCADDRT: 1625 case SIOCDELRT: 1626 rc = -EPERM; 1627 if (!capable(CAP_NET_ADMIN)) 1628 break; 1629 lock_kernel(); 1630 rc = x25_route_ioctl(cmd, argp); 1631 unlock_kernel(); 1632 break; 1633 case SIOCX25GSUBSCRIP: 1634 lock_kernel(); 1635 rc = compat_x25_subscr_ioctl(cmd, argp); 1636 unlock_kernel(); 1637 break; 1638 case SIOCX25SSUBSCRIP: 1639 rc = -EPERM; 1640 if (!capable(CAP_NET_ADMIN)) 1641 break; 1642 lock_kernel(); 1643 rc = compat_x25_subscr_ioctl(cmd, argp); 1644 unlock_kernel(); 1645 break; 1646 case SIOCX25GFACILITIES: 1647 case SIOCX25SFACILITIES: 1648 case SIOCX25GDTEFACILITIES: 1649 case SIOCX25SDTEFACILITIES: 1650 case SIOCX25GCALLUSERDATA: 1651 case SIOCX25SCALLUSERDATA: 1652 case SIOCX25GCAUSEDIAG: 1653 case SIOCX25SCAUSEDIAG: 1654 case SIOCX25SCUDMATCHLEN: 1655 case SIOCX25CALLACCPTAPPRV: 1656 case SIOCX25SENDCALLACCPT: 1657 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1658 break; 1659 default: 1660 rc = -ENOIOCTLCMD; 1661 break; 1662 } 1663 return rc; 1664 } 1665 #endif 1666 1667 static const struct proto_ops x25_proto_ops = { 1668 .family = AF_X25, 1669 .owner = THIS_MODULE, 1670 .release = x25_release, 1671 .bind = x25_bind, 1672 .connect = x25_connect, 1673 .socketpair = sock_no_socketpair, 1674 .accept = x25_accept, 1675 .getname = x25_getname, 1676 .poll = x25_datagram_poll, 1677 .ioctl = x25_ioctl, 1678 #ifdef CONFIG_COMPAT 1679 .compat_ioctl = compat_x25_ioctl, 1680 #endif 1681 .listen = x25_listen, 1682 .shutdown = sock_no_shutdown, 1683 .setsockopt = x25_setsockopt, 1684 .getsockopt = x25_getsockopt, 1685 .sendmsg = x25_sendmsg, 1686 .recvmsg = x25_recvmsg, 1687 .mmap = sock_no_mmap, 1688 .sendpage = sock_no_sendpage, 1689 }; 1690 1691 static struct packet_type x25_packet_type __read_mostly = { 1692 .type = cpu_to_be16(ETH_P_X25), 1693 .func = x25_lapb_receive_frame, 1694 }; 1695 1696 static struct notifier_block x25_dev_notifier = { 1697 .notifier_call = x25_device_event, 1698 }; 1699 1700 void x25_kill_by_neigh(struct x25_neigh *nb) 1701 { 1702 struct sock *s; 1703 struct hlist_node *node; 1704 1705 write_lock_bh(&x25_list_lock); 1706 1707 sk_for_each(s, node, &x25_list) 1708 if (x25_sk(s)->neighbour == nb) 1709 x25_disconnect(s, ENETUNREACH, 0, 0); 1710 1711 write_unlock_bh(&x25_list_lock); 1712 1713 /* Remove any related forwards */ 1714 x25_clear_forward_by_dev(nb->dev); 1715 } 1716 1717 static int __init x25_init(void) 1718 { 1719 int rc = proto_register(&x25_proto, 0); 1720 1721 if (rc != 0) 1722 goto out; 1723 1724 rc = sock_register(&x25_family_ops); 1725 if (rc != 0) 1726 goto out_proto; 1727 1728 dev_add_pack(&x25_packet_type); 1729 1730 rc = register_netdevice_notifier(&x25_dev_notifier); 1731 if (rc != 0) 1732 goto out_sock; 1733 1734 printk(KERN_INFO "X.25 for Linux Version 0.2\n"); 1735 1736 x25_register_sysctl(); 1737 rc = x25_proc_init(); 1738 if (rc != 0) 1739 goto out_dev; 1740 out: 1741 return rc; 1742 out_dev: 1743 unregister_netdevice_notifier(&x25_dev_notifier); 1744 out_sock: 1745 sock_unregister(AF_X25); 1746 out_proto: 1747 proto_unregister(&x25_proto); 1748 goto out; 1749 } 1750 module_init(x25_init); 1751 1752 static void __exit x25_exit(void) 1753 { 1754 x25_proc_exit(); 1755 x25_link_free(); 1756 x25_route_free(); 1757 1758 x25_unregister_sysctl(); 1759 1760 unregister_netdevice_notifier(&x25_dev_notifier); 1761 1762 dev_remove_pack(&x25_packet_type); 1763 1764 sock_unregister(AF_X25); 1765 proto_unregister(&x25_proto); 1766 } 1767 module_exit(x25_exit); 1768 1769 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1770 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1771 MODULE_LICENSE("GPL"); 1772 MODULE_ALIAS_NETPROTO(PF_X25); 1773