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 <linux/slab.h> 51 #include <net/sock.h> 52 #include <net/tcp_states.h> 53 #include <asm/uaccess.h> 54 #include <linux/fcntl.h> 55 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 56 #include <linux/notifier.h> 57 #include <linux/init.h> 58 #include <linux/compat.h> 59 #include <linux/ctype.h> 60 61 #include <net/x25.h> 62 #include <net/compat.h> 63 64 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 65 int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 66 int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 67 int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 68 int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 69 int sysctl_x25_forward = 0; 70 71 HLIST_HEAD(x25_list); 72 DEFINE_RWLOCK(x25_list_lock); 73 74 static const struct proto_ops x25_proto_ops; 75 76 static struct x25_address null_x25_address = {" "}; 77 78 #ifdef CONFIG_COMPAT 79 struct compat_x25_subscrip_struct { 80 char device[200-sizeof(compat_ulong_t)]; 81 compat_ulong_t global_facil_mask; 82 compat_uint_t extended; 83 }; 84 #endif 85 86 87 int x25_parse_address_block(struct sk_buff *skb, 88 struct x25_address *called_addr, 89 struct x25_address *calling_addr) 90 { 91 unsigned char len; 92 int needed; 93 int rc; 94 95 if (skb->len < 1) { 96 /* packet has no address block */ 97 rc = 0; 98 goto empty; 99 } 100 101 len = *skb->data; 102 needed = 1 + (len >> 4) + (len & 0x0f); 103 104 if (skb->len < needed) { 105 /* packet is too short to hold the addresses it claims 106 to hold */ 107 rc = -1; 108 goto empty; 109 } 110 111 return x25_addr_ntoa(skb->data, called_addr, calling_addr); 112 113 empty: 114 *called_addr->x25_addr = 0; 115 *calling_addr->x25_addr = 0; 116 117 return rc; 118 } 119 120 121 int x25_addr_ntoa(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 unsigned int i; 127 128 called_len = (*p >> 0) & 0x0F; 129 calling_len = (*p >> 4) & 0x0F; 130 131 called = called_addr->x25_addr; 132 calling = calling_addr->x25_addr; 133 p++; 134 135 for (i = 0; i < (called_len + calling_len); i++) { 136 if (i < called_len) { 137 if (i % 2 != 0) { 138 *called++ = ((*p >> 0) & 0x0F) + '0'; 139 p++; 140 } else { 141 *called++ = ((*p >> 4) & 0x0F) + '0'; 142 } 143 } else { 144 if (i % 2 != 0) { 145 *calling++ = ((*p >> 0) & 0x0F) + '0'; 146 p++; 147 } else { 148 *calling++ = ((*p >> 4) & 0x0F) + '0'; 149 } 150 } 151 } 152 153 *called = *calling = '\0'; 154 155 return 1 + (called_len + calling_len + 1) / 2; 156 } 157 158 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 159 struct x25_address *calling_addr) 160 { 161 unsigned int called_len, calling_len; 162 char *called, *calling; 163 int i; 164 165 called = called_addr->x25_addr; 166 calling = calling_addr->x25_addr; 167 168 called_len = strlen(called); 169 calling_len = strlen(calling); 170 171 *p++ = (calling_len << 4) | (called_len << 0); 172 173 for (i = 0; i < (called_len + calling_len); i++) { 174 if (i < called_len) { 175 if (i % 2 != 0) { 176 *p |= (*called++ - '0') << 0; 177 p++; 178 } else { 179 *p = 0x00; 180 *p |= (*called++ - '0') << 4; 181 } 182 } else { 183 if (i % 2 != 0) { 184 *p |= (*calling++ - '0') << 0; 185 p++; 186 } else { 187 *p = 0x00; 188 *p |= (*calling++ - '0') << 4; 189 } 190 } 191 } 192 193 return 1 + (called_len + calling_len + 1) / 2; 194 } 195 196 /* 197 * Socket removal during an interrupt is now safe. 198 */ 199 static void x25_remove_socket(struct sock *sk) 200 { 201 write_lock_bh(&x25_list_lock); 202 sk_del_node_init(sk); 203 write_unlock_bh(&x25_list_lock); 204 } 205 206 /* 207 * Kill all bound sockets on a dropped device. 208 */ 209 static void x25_kill_by_device(struct net_device *dev) 210 { 211 struct sock *s; 212 struct hlist_node *node; 213 214 write_lock_bh(&x25_list_lock); 215 216 sk_for_each(s, node, &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 = 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 defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE) 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 struct hlist_node *node; 285 286 read_lock_bh(&x25_list_lock); 287 next_best = NULL; 288 289 sk_for_each(s, node, &x25_list) 290 if ((!strcmp(addr->x25_addr, 291 x25_sk(s)->source_addr.x25_addr) || 292 !strcmp(addr->x25_addr, 293 null_x25_address.x25_addr)) && 294 s->sk_state == TCP_LISTEN) { 295 /* 296 * Found a listening socket, now check the incoming 297 * call user data vs this sockets call user data 298 */ 299 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { 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 struct hlist_node *node; 327 328 sk_for_each(s, node, &x25_list) 329 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 330 sock_hold(s); 331 goto found; 332 } 333 s = NULL; 334 found: 335 return s; 336 } 337 338 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 339 { 340 struct sock *s; 341 342 read_lock_bh(&x25_list_lock); 343 s = __x25_find_socket(lci, nb); 344 read_unlock_bh(&x25_list_lock); 345 return s; 346 } 347 348 /* 349 * Find a unique LCI for a given device. 350 */ 351 static unsigned int x25_new_lci(struct x25_neigh *nb) 352 { 353 unsigned int lci = 1; 354 struct sock *sk; 355 356 read_lock_bh(&x25_list_lock); 357 358 while ((sk = __x25_find_socket(lci, nb)) != NULL) { 359 sock_put(sk); 360 if (++lci == 4096) { 361 lci = 0; 362 break; 363 } 364 } 365 366 read_unlock_bh(&x25_list_lock); 367 return lci; 368 } 369 370 /* 371 * Deferred destroy. 372 */ 373 static void __x25_destroy_socket(struct sock *); 374 375 /* 376 * handler for deferred kills. 377 */ 378 static void x25_destroy_timer(unsigned long data) 379 { 380 x25_destroy_socket_from_timer((struct sock *)data); 381 } 382 383 /* 384 * This is called from user mode and the timers. Thus it protects itself 385 * against interrupt users but doesn't worry about being called during 386 * work. Once it is removed from the queue no interrupt or bottom half 387 * will touch it and we are (fairly 8-) ) safe. 388 * Not static as it's used by the timer 389 */ 390 static void __x25_destroy_socket(struct sock *sk) 391 { 392 struct sk_buff *skb; 393 394 x25_stop_heartbeat(sk); 395 x25_stop_timer(sk); 396 397 x25_remove_socket(sk); 398 x25_clear_queues(sk); /* Flush the queues */ 399 400 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 401 if (skb->sk != sk) { /* A pending connection */ 402 /* 403 * Queue the unaccepted socket for death 404 */ 405 skb->sk->sk_state = TCP_LISTEN; 406 sock_set_flag(skb->sk, SOCK_DEAD); 407 x25_start_heartbeat(skb->sk); 408 x25_sk(skb->sk)->state = X25_STATE_0; 409 } 410 411 kfree_skb(skb); 412 } 413 414 if (sk_has_allocations(sk)) { 415 /* Defer: outstanding buffers */ 416 sk->sk_timer.expires = jiffies + 10 * HZ; 417 sk->sk_timer.function = x25_destroy_timer; 418 sk->sk_timer.data = (unsigned long)sk; 419 add_timer(&sk->sk_timer); 420 } else { 421 /* drop last reference so sock_put will free */ 422 __sock_put(sk); 423 } 424 } 425 426 void x25_destroy_socket_from_timer(struct sock *sk) 427 { 428 sock_hold(sk); 429 bh_lock_sock(sk); 430 __x25_destroy_socket(sk); 431 bh_unlock_sock(sk); 432 sock_put(sk); 433 } 434 435 static void x25_destroy_socket(struct sock *sk) 436 { 437 sock_hold(sk); 438 lock_sock(sk); 439 __x25_destroy_socket(sk); 440 release_sock(sk); 441 sock_put(sk); 442 } 443 444 /* 445 * Handling for system calls applied via the various interfaces to a 446 * X.25 socket object. 447 */ 448 449 static int x25_setsockopt(struct socket *sock, int level, int optname, 450 char __user *optval, unsigned int optlen) 451 { 452 int opt; 453 struct sock *sk = sock->sk; 454 int rc = -ENOPROTOOPT; 455 456 if (level != SOL_X25 || optname != X25_QBITINCL) 457 goto out; 458 459 rc = -EINVAL; 460 if (optlen < sizeof(int)) 461 goto out; 462 463 rc = -EFAULT; 464 if (get_user(opt, (int __user *)optval)) 465 goto out; 466 467 if (opt) 468 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 469 else 470 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 471 rc = 0; 472 out: 473 return rc; 474 } 475 476 static int x25_getsockopt(struct socket *sock, int level, int optname, 477 char __user *optval, int __user *optlen) 478 { 479 struct sock *sk = sock->sk; 480 int val, len, rc = -ENOPROTOOPT; 481 482 if (level != SOL_X25 || optname != X25_QBITINCL) 483 goto out; 484 485 rc = -EFAULT; 486 if (get_user(len, optlen)) 487 goto out; 488 489 len = min_t(unsigned int, len, sizeof(int)); 490 491 rc = -EINVAL; 492 if (len < 0) 493 goto out; 494 495 rc = -EFAULT; 496 if (put_user(len, optlen)) 497 goto out; 498 499 val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags); 500 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 501 out: 502 return rc; 503 } 504 505 static int x25_listen(struct socket *sock, int backlog) 506 { 507 struct sock *sk = sock->sk; 508 int rc = -EOPNOTSUPP; 509 510 lock_kernel(); 511 if (sk->sk_state != TCP_LISTEN) { 512 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 513 sk->sk_max_ack_backlog = backlog; 514 sk->sk_state = TCP_LISTEN; 515 rc = 0; 516 } 517 unlock_kernel(); 518 519 return rc; 520 } 521 522 static struct proto x25_proto = { 523 .name = "X25", 524 .owner = THIS_MODULE, 525 .obj_size = sizeof(struct x25_sock), 526 }; 527 528 static struct sock *x25_alloc_socket(struct net *net) 529 { 530 struct x25_sock *x25; 531 struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto); 532 533 if (!sk) 534 goto out; 535 536 sock_init_data(NULL, sk); 537 538 x25 = x25_sk(sk); 539 skb_queue_head_init(&x25->ack_queue); 540 skb_queue_head_init(&x25->fragment_queue); 541 skb_queue_head_init(&x25->interrupt_in_queue); 542 skb_queue_head_init(&x25->interrupt_out_queue); 543 out: 544 return sk; 545 } 546 547 static int x25_create(struct net *net, struct socket *sock, int protocol, 548 int kern) 549 { 550 struct sock *sk; 551 struct x25_sock *x25; 552 int rc = -EAFNOSUPPORT; 553 554 if (!net_eq(net, &init_net)) 555 goto out; 556 557 rc = -ESOCKTNOSUPPORT; 558 if (sock->type != SOCK_SEQPACKET) 559 goto out; 560 561 rc = -EINVAL; 562 if (protocol) 563 goto out; 564 565 rc = -ENOBUFS; 566 if ((sk = x25_alloc_socket(net)) == NULL) 567 goto out; 568 569 x25 = x25_sk(sk); 570 571 sock_init_data(sock, sk); 572 573 x25_init_timers(sk); 574 575 sock->ops = &x25_proto_ops; 576 sk->sk_protocol = protocol; 577 sk->sk_backlog_rcv = x25_backlog_rcv; 578 579 x25->t21 = sysctl_x25_call_request_timeout; 580 x25->t22 = sysctl_x25_reset_request_timeout; 581 x25->t23 = sysctl_x25_clear_request_timeout; 582 x25->t2 = sysctl_x25_ack_holdback_timeout; 583 x25->state = X25_STATE_0; 584 x25->cudmatchlength = 0; 585 set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); /* normally no cud */ 586 /* on call accept */ 587 588 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 589 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 590 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 591 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 592 x25->facilities.throughput = 0; /* by default don't negotiate 593 throughput */ 594 x25->facilities.reverse = X25_DEFAULT_REVERSE; 595 x25->dte_facilities.calling_len = 0; 596 x25->dte_facilities.called_len = 0; 597 memset(x25->dte_facilities.called_ae, '\0', 598 sizeof(x25->dte_facilities.called_ae)); 599 memset(x25->dte_facilities.calling_ae, '\0', 600 sizeof(x25->dte_facilities.calling_ae)); 601 602 rc = 0; 603 out: 604 return rc; 605 } 606 607 static struct sock *x25_make_new(struct sock *osk) 608 { 609 struct sock *sk = NULL; 610 struct x25_sock *x25, *ox25; 611 612 if (osk->sk_type != SOCK_SEQPACKET) 613 goto out; 614 615 if ((sk = x25_alloc_socket(sock_net(osk))) == NULL) 616 goto out; 617 618 x25 = x25_sk(sk); 619 620 sk->sk_type = osk->sk_type; 621 sk->sk_priority = osk->sk_priority; 622 sk->sk_protocol = osk->sk_protocol; 623 sk->sk_rcvbuf = osk->sk_rcvbuf; 624 sk->sk_sndbuf = osk->sk_sndbuf; 625 sk->sk_state = TCP_ESTABLISHED; 626 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 627 sock_copy_flags(sk, osk); 628 629 ox25 = x25_sk(osk); 630 x25->t21 = ox25->t21; 631 x25->t22 = ox25->t22; 632 x25->t23 = ox25->t23; 633 x25->t2 = ox25->t2; 634 x25->flags = ox25->flags; 635 x25->facilities = ox25->facilities; 636 x25->dte_facilities = ox25->dte_facilities; 637 x25->cudmatchlength = ox25->cudmatchlength; 638 639 clear_bit(X25_INTERRUPT_FLAG, &x25->flags); 640 x25_init_timers(sk); 641 out: 642 return sk; 643 } 644 645 static int x25_release(struct socket *sock) 646 { 647 struct sock *sk = sock->sk; 648 struct x25_sock *x25; 649 650 lock_kernel(); 651 if (!sk) 652 goto out; 653 654 x25 = x25_sk(sk); 655 656 switch (x25->state) { 657 658 case X25_STATE_0: 659 case X25_STATE_2: 660 x25_disconnect(sk, 0, 0, 0); 661 x25_destroy_socket(sk); 662 goto out; 663 664 case X25_STATE_1: 665 case X25_STATE_3: 666 case X25_STATE_4: 667 x25_clear_queues(sk); 668 x25_write_internal(sk, X25_CLEAR_REQUEST); 669 x25_start_t23timer(sk); 670 x25->state = X25_STATE_2; 671 sk->sk_state = TCP_CLOSE; 672 sk->sk_shutdown |= SEND_SHUTDOWN; 673 sk->sk_state_change(sk); 674 sock_set_flag(sk, SOCK_DEAD); 675 sock_set_flag(sk, SOCK_DESTROY); 676 break; 677 } 678 679 sock_orphan(sk); 680 out: 681 unlock_kernel(); 682 return 0; 683 } 684 685 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 686 { 687 struct sock *sk = sock->sk; 688 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 689 int len, i, rc = 0; 690 691 lock_kernel(); 692 if (!sock_flag(sk, SOCK_ZAPPED) || 693 addr_len != sizeof(struct sockaddr_x25) || 694 addr->sx25_family != AF_X25) { 695 rc = -EINVAL; 696 goto out; 697 } 698 699 len = strlen(addr->sx25_addr.x25_addr); 700 for (i = 0; i < len; i++) { 701 if (!isdigit(addr->sx25_addr.x25_addr[i])) { 702 rc = -EINVAL; 703 goto out; 704 } 705 } 706 707 x25_sk(sk)->source_addr = addr->sx25_addr; 708 x25_insert_socket(sk); 709 sock_reset_flag(sk, SOCK_ZAPPED); 710 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 711 out: 712 unlock_kernel(); 713 return rc; 714 } 715 716 static int x25_wait_for_connection_establishment(struct sock *sk) 717 { 718 DECLARE_WAITQUEUE(wait, current); 719 int rc; 720 721 add_wait_queue_exclusive(sk_sleep(sk), &wait); 722 for (;;) { 723 __set_current_state(TASK_INTERRUPTIBLE); 724 rc = -ERESTARTSYS; 725 if (signal_pending(current)) 726 break; 727 rc = sock_error(sk); 728 if (rc) { 729 sk->sk_socket->state = SS_UNCONNECTED; 730 break; 731 } 732 rc = 0; 733 if (sk->sk_state != TCP_ESTABLISHED) { 734 release_sock(sk); 735 schedule(); 736 lock_sock(sk); 737 } else 738 break; 739 } 740 __set_current_state(TASK_RUNNING); 741 remove_wait_queue(sk_sleep(sk), &wait); 742 return rc; 743 } 744 745 static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 746 int addr_len, int flags) 747 { 748 struct sock *sk = sock->sk; 749 struct x25_sock *x25 = x25_sk(sk); 750 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 751 struct x25_route *rt; 752 int rc = 0; 753 754 lock_kernel(); 755 lock_sock(sk); 756 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 757 sock->state = SS_CONNECTED; 758 goto out; /* Connect completed during a ERESTARTSYS event */ 759 } 760 761 rc = -ECONNREFUSED; 762 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 763 sock->state = SS_UNCONNECTED; 764 goto out; 765 } 766 767 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 768 if (sk->sk_state == TCP_ESTABLISHED) 769 goto out; 770 771 sk->sk_state = TCP_CLOSE; 772 sock->state = SS_UNCONNECTED; 773 774 rc = -EINVAL; 775 if (addr_len != sizeof(struct sockaddr_x25) || 776 addr->sx25_family != AF_X25) 777 goto out; 778 779 rc = -ENETUNREACH; 780 rt = x25_get_route(&addr->sx25_addr); 781 if (!rt) 782 goto out; 783 784 x25->neighbour = x25_get_neigh(rt->dev); 785 if (!x25->neighbour) 786 goto out_put_route; 787 788 x25_limit_facilities(&x25->facilities, x25->neighbour); 789 790 x25->lci = x25_new_lci(x25->neighbour); 791 if (!x25->lci) 792 goto out_put_neigh; 793 794 rc = -EINVAL; 795 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 796 goto out_put_neigh; 797 798 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 799 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 800 801 x25->dest_addr = addr->sx25_addr; 802 803 /* Move to connecting socket, start sending Connect Requests */ 804 sock->state = SS_CONNECTING; 805 sk->sk_state = TCP_SYN_SENT; 806 807 x25->state = X25_STATE_1; 808 809 x25_write_internal(sk, X25_CALL_REQUEST); 810 811 x25_start_heartbeat(sk); 812 x25_start_t21timer(sk); 813 814 /* Now the loop */ 815 rc = -EINPROGRESS; 816 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 817 goto out_put_neigh; 818 819 rc = x25_wait_for_connection_establishment(sk); 820 if (rc) 821 goto out_put_neigh; 822 823 sock->state = SS_CONNECTED; 824 rc = 0; 825 out_put_neigh: 826 if (rc) 827 x25_neigh_put(x25->neighbour); 828 out_put_route: 829 x25_route_put(rt); 830 out: 831 release_sock(sk); 832 unlock_kernel(); 833 return rc; 834 } 835 836 static int x25_wait_for_data(struct sock *sk, long timeout) 837 { 838 DECLARE_WAITQUEUE(wait, current); 839 int rc = 0; 840 841 add_wait_queue_exclusive(sk_sleep(sk), &wait); 842 for (;;) { 843 __set_current_state(TASK_INTERRUPTIBLE); 844 if (sk->sk_shutdown & RCV_SHUTDOWN) 845 break; 846 rc = -ERESTARTSYS; 847 if (signal_pending(current)) 848 break; 849 rc = -EAGAIN; 850 if (!timeout) 851 break; 852 rc = 0; 853 if (skb_queue_empty(&sk->sk_receive_queue)) { 854 release_sock(sk); 855 timeout = schedule_timeout(timeout); 856 lock_sock(sk); 857 } else 858 break; 859 } 860 __set_current_state(TASK_RUNNING); 861 remove_wait_queue(sk_sleep(sk), &wait); 862 return rc; 863 } 864 865 static int x25_accept(struct socket *sock, struct socket *newsock, int flags) 866 { 867 struct sock *sk = sock->sk; 868 struct sock *newsk; 869 struct sk_buff *skb; 870 int rc = -EINVAL; 871 872 lock_kernel(); 873 if (!sk || sk->sk_state != TCP_LISTEN) 874 goto out; 875 876 rc = -EOPNOTSUPP; 877 if (sk->sk_type != SOCK_SEQPACKET) 878 goto out; 879 880 lock_sock(sk); 881 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 882 if (rc) 883 goto out2; 884 skb = skb_dequeue(&sk->sk_receive_queue); 885 rc = -EINVAL; 886 if (!skb->sk) 887 goto out2; 888 newsk = skb->sk; 889 sock_graft(newsk, newsock); 890 891 /* Now attach up the new socket */ 892 skb->sk = NULL; 893 kfree_skb(skb); 894 sk->sk_ack_backlog--; 895 newsock->state = SS_CONNECTED; 896 rc = 0; 897 out2: 898 release_sock(sk); 899 out: 900 unlock_kernel(); 901 return rc; 902 } 903 904 static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 905 int *uaddr_len, int peer) 906 { 907 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 908 struct sock *sk = sock->sk; 909 struct x25_sock *x25 = x25_sk(sk); 910 int rc = 0; 911 912 lock_kernel(); 913 if (peer) { 914 if (sk->sk_state != TCP_ESTABLISHED) { 915 rc = -ENOTCONN; 916 goto out; 917 } 918 sx25->sx25_addr = x25->dest_addr; 919 } else 920 sx25->sx25_addr = x25->source_addr; 921 922 sx25->sx25_family = AF_X25; 923 *uaddr_len = sizeof(*sx25); 924 925 out: 926 unlock_kernel(); 927 return rc; 928 } 929 930 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock, 931 poll_table *wait) 932 { 933 int rc; 934 935 lock_kernel(); 936 rc = datagram_poll(file, sock, wait); 937 unlock_kernel(); 938 939 return rc; 940 } 941 942 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 943 unsigned int lci) 944 { 945 struct sock *sk; 946 struct sock *make; 947 struct x25_sock *makex25; 948 struct x25_address source_addr, dest_addr; 949 struct x25_facilities facilities; 950 struct x25_dte_facilities dte_facilities; 951 int len, addr_len, rc; 952 953 /* 954 * Remove the LCI and frame type. 955 */ 956 skb_pull(skb, X25_STD_MIN_LEN); 957 958 /* 959 * Extract the X.25 addresses and convert them to ASCII strings, 960 * and remove them. 961 * 962 * Address block is mandatory in call request packets 963 */ 964 addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr); 965 if (addr_len <= 0) 966 goto out_clear_request; 967 skb_pull(skb, addr_len); 968 969 /* 970 * Get the length of the facilities, skip past them for the moment 971 * get the call user data because this is needed to determine 972 * the correct listener 973 * 974 * Facilities length is mandatory in call request packets 975 */ 976 if (skb->len < 1) 977 goto out_clear_request; 978 len = skb->data[0] + 1; 979 if (skb->len < len) 980 goto out_clear_request; 981 skb_pull(skb,len); 982 983 /* 984 * Find a listener for the particular address/cud pair. 985 */ 986 sk = x25_find_listener(&source_addr,skb); 987 skb_push(skb,len); 988 989 if (sk != NULL && sk_acceptq_is_full(sk)) { 990 goto out_sock_put; 991 } 992 993 /* 994 * We dont have any listeners for this incoming call. 995 * Try forwarding it. 996 */ 997 if (sk == NULL) { 998 skb_push(skb, addr_len + X25_STD_MIN_LEN); 999 if (sysctl_x25_forward && 1000 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 1001 { 1002 /* Call was forwarded, dont process it any more */ 1003 kfree_skb(skb); 1004 rc = 1; 1005 goto out; 1006 } else { 1007 /* No listeners, can't forward, clear the call */ 1008 goto out_clear_request; 1009 } 1010 } 1011 1012 /* 1013 * Try to reach a compromise on the requested facilities. 1014 */ 1015 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 1016 if (len == -1) 1017 goto out_sock_put; 1018 1019 /* 1020 * current neighbour/link might impose additional limits 1021 * on certain facilties 1022 */ 1023 1024 x25_limit_facilities(&facilities, nb); 1025 1026 /* 1027 * Try to create a new socket. 1028 */ 1029 make = x25_make_new(sk); 1030 if (!make) 1031 goto out_sock_put; 1032 1033 /* 1034 * Remove the facilities 1035 */ 1036 skb_pull(skb, len); 1037 1038 skb->sk = make; 1039 make->sk_state = TCP_ESTABLISHED; 1040 1041 makex25 = x25_sk(make); 1042 makex25->lci = lci; 1043 makex25->dest_addr = dest_addr; 1044 makex25->source_addr = source_addr; 1045 makex25->neighbour = nb; 1046 makex25->facilities = facilities; 1047 makex25->dte_facilities= dte_facilities; 1048 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 1049 /* ensure no reverse facil on accept */ 1050 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 1051 /* ensure no calling address extension on accept */ 1052 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 1053 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 1054 1055 /* Normally all calls are accepted immediately */ 1056 if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) { 1057 x25_write_internal(make, X25_CALL_ACCEPTED); 1058 makex25->state = X25_STATE_3; 1059 } 1060 1061 /* 1062 * Incoming Call User Data. 1063 */ 1064 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 1065 makex25->calluserdata.cudlength = skb->len; 1066 1067 sk->sk_ack_backlog++; 1068 1069 x25_insert_socket(make); 1070 1071 skb_queue_head(&sk->sk_receive_queue, skb); 1072 1073 x25_start_heartbeat(make); 1074 1075 if (!sock_flag(sk, SOCK_DEAD)) 1076 sk->sk_data_ready(sk, skb->len); 1077 rc = 1; 1078 sock_put(sk); 1079 out: 1080 return rc; 1081 out_sock_put: 1082 sock_put(sk); 1083 out_clear_request: 1084 rc = 0; 1085 x25_transmit_clear_request(nb, lci, 0x01); 1086 goto out; 1087 } 1088 1089 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, 1090 struct msghdr *msg, size_t len) 1091 { 1092 struct sock *sk = sock->sk; 1093 struct x25_sock *x25 = x25_sk(sk); 1094 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name; 1095 struct sockaddr_x25 sx25; 1096 struct sk_buff *skb; 1097 unsigned char *asmptr; 1098 int noblock = msg->msg_flags & MSG_DONTWAIT; 1099 size_t size; 1100 int qbit = 0, rc = -EINVAL; 1101 1102 lock_kernel(); 1103 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 1104 goto out; 1105 1106 /* we currently don't support segmented records at the user interface */ 1107 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 1108 goto out; 1109 1110 rc = -EADDRNOTAVAIL; 1111 if (sock_flag(sk, SOCK_ZAPPED)) 1112 goto out; 1113 1114 rc = -EPIPE; 1115 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1116 send_sig(SIGPIPE, current, 0); 1117 goto out; 1118 } 1119 1120 rc = -ENETUNREACH; 1121 if (!x25->neighbour) 1122 goto out; 1123 1124 if (usx25) { 1125 rc = -EINVAL; 1126 if (msg->msg_namelen < sizeof(sx25)) 1127 goto out; 1128 memcpy(&sx25, usx25, sizeof(sx25)); 1129 rc = -EISCONN; 1130 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1131 goto out; 1132 rc = -EINVAL; 1133 if (sx25.sx25_family != AF_X25) 1134 goto out; 1135 } else { 1136 /* 1137 * FIXME 1003.1g - if the socket is like this because 1138 * it has become closed (not started closed) we ought 1139 * to SIGPIPE, EPIPE; 1140 */ 1141 rc = -ENOTCONN; 1142 if (sk->sk_state != TCP_ESTABLISHED) 1143 goto out; 1144 1145 sx25.sx25_family = AF_X25; 1146 sx25.sx25_addr = x25->dest_addr; 1147 } 1148 1149 /* Sanity check the packet size */ 1150 if (len > 65535) { 1151 rc = -EMSGSIZE; 1152 goto out; 1153 } 1154 1155 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1156 1157 /* Build a packet */ 1158 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1159 1160 if ((msg->msg_flags & MSG_OOB) && len > 32) 1161 len = 32; 1162 1163 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1164 1165 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1166 if (!skb) 1167 goto out; 1168 X25_SKB_CB(skb)->flags = msg->msg_flags; 1169 1170 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1171 1172 /* 1173 * Put the data on the end 1174 */ 1175 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1176 1177 skb_reset_transport_header(skb); 1178 skb_put(skb, len); 1179 1180 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len); 1181 if (rc) 1182 goto out_kfree_skb; 1183 1184 /* 1185 * If the Q BIT Include socket option is in force, the first 1186 * byte of the user data is the logical value of the Q Bit. 1187 */ 1188 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1189 qbit = skb->data[0]; 1190 skb_pull(skb, 1); 1191 } 1192 1193 /* 1194 * Push down the X.25 header 1195 */ 1196 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1197 1198 if (msg->msg_flags & MSG_OOB) { 1199 if (x25->neighbour->extended) { 1200 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1201 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1202 *asmptr++ = (x25->lci >> 0) & 0xFF; 1203 *asmptr++ = X25_INTERRUPT; 1204 } else { 1205 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1206 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1207 *asmptr++ = (x25->lci >> 0) & 0xFF; 1208 *asmptr++ = X25_INTERRUPT; 1209 } 1210 } else { 1211 if (x25->neighbour->extended) { 1212 /* Build an Extended X.25 header */ 1213 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1214 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1215 *asmptr++ = (x25->lci >> 0) & 0xFF; 1216 *asmptr++ = X25_DATA; 1217 *asmptr++ = X25_DATA; 1218 } else { 1219 /* Build an Standard X.25 header */ 1220 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1221 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1222 *asmptr++ = (x25->lci >> 0) & 0xFF; 1223 *asmptr++ = X25_DATA; 1224 } 1225 1226 if (qbit) 1227 skb->data[0] |= X25_Q_BIT; 1228 } 1229 1230 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1231 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1232 1233 rc = -ENOTCONN; 1234 if (sk->sk_state != TCP_ESTABLISHED) 1235 goto out_kfree_skb; 1236 1237 if (msg->msg_flags & MSG_OOB) 1238 skb_queue_tail(&x25->interrupt_out_queue, skb); 1239 else { 1240 rc = x25_output(sk, skb); 1241 len = rc; 1242 if (rc < 0) 1243 kfree_skb(skb); 1244 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) 1245 len++; 1246 } 1247 1248 /* 1249 * lock_sock() is currently only used to serialize this x25_kick() 1250 * against input-driven x25_kick() calls. It currently only blocks 1251 * incoming packets for this socket and does not protect against 1252 * any other socket state changes and is not called from anywhere 1253 * else. As x25_kick() cannot block and as long as all socket 1254 * operations are BKL-wrapped, we don't need take to care about 1255 * purging the backlog queue in x25_release(). 1256 * 1257 * Using lock_sock() to protect all socket operations entirely 1258 * (and making the whole x25 stack SMP aware) unfortunately would 1259 * require major changes to {send,recv}msg and skb allocation methods. 1260 * -> 2.5 ;) 1261 */ 1262 lock_sock(sk); 1263 x25_kick(sk); 1264 release_sock(sk); 1265 rc = len; 1266 out: 1267 unlock_kernel(); 1268 return rc; 1269 out_kfree_skb: 1270 kfree_skb(skb); 1271 goto out; 1272 } 1273 1274 1275 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, 1276 struct msghdr *msg, size_t size, 1277 int flags) 1278 { 1279 struct sock *sk = sock->sk; 1280 struct x25_sock *x25 = x25_sk(sk); 1281 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; 1282 size_t copied; 1283 int qbit; 1284 struct sk_buff *skb; 1285 unsigned char *asmptr; 1286 int rc = -ENOTCONN; 1287 1288 lock_kernel(); 1289 /* 1290 * This works for seqpacket too. The receiver has ordered the queue for 1291 * us! We do one quick check first though 1292 */ 1293 if (sk->sk_state != TCP_ESTABLISHED) 1294 goto out; 1295 1296 if (flags & MSG_OOB) { 1297 rc = -EINVAL; 1298 if (sock_flag(sk, SOCK_URGINLINE) || 1299 !skb_peek(&x25->interrupt_in_queue)) 1300 goto out; 1301 1302 skb = skb_dequeue(&x25->interrupt_in_queue); 1303 1304 skb_pull(skb, X25_STD_MIN_LEN); 1305 1306 /* 1307 * No Q bit information on Interrupt data. 1308 */ 1309 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1310 asmptr = skb_push(skb, 1); 1311 *asmptr = 0x00; 1312 } 1313 1314 msg->msg_flags |= MSG_OOB; 1315 } else { 1316 /* Now we can treat all alike */ 1317 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1318 flags & MSG_DONTWAIT, &rc); 1319 if (!skb) 1320 goto out; 1321 1322 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1323 1324 skb_pull(skb, x25->neighbour->extended ? 1325 X25_EXT_MIN_LEN : X25_STD_MIN_LEN); 1326 1327 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) { 1328 asmptr = skb_push(skb, 1); 1329 *asmptr = qbit; 1330 } 1331 } 1332 1333 skb_reset_transport_header(skb); 1334 copied = skb->len; 1335 1336 if (copied > size) { 1337 copied = size; 1338 msg->msg_flags |= MSG_TRUNC; 1339 } 1340 1341 /* Currently, each datagram always contains a complete record */ 1342 msg->msg_flags |= MSG_EOR; 1343 1344 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1345 if (rc) 1346 goto out_free_dgram; 1347 1348 if (sx25) { 1349 sx25->sx25_family = AF_X25; 1350 sx25->sx25_addr = x25->dest_addr; 1351 } 1352 1353 msg->msg_namelen = sizeof(struct sockaddr_x25); 1354 1355 lock_sock(sk); 1356 x25_check_rbuf(sk); 1357 release_sock(sk); 1358 rc = copied; 1359 out_free_dgram: 1360 skb_free_datagram(sk, skb); 1361 out: 1362 unlock_kernel(); 1363 return rc; 1364 } 1365 1366 1367 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1368 { 1369 struct sock *sk = sock->sk; 1370 struct x25_sock *x25 = x25_sk(sk); 1371 void __user *argp = (void __user *)arg; 1372 int rc; 1373 1374 lock_kernel(); 1375 switch (cmd) { 1376 case TIOCOUTQ: { 1377 int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk); 1378 1379 if (amount < 0) 1380 amount = 0; 1381 rc = put_user(amount, (unsigned int __user *)argp); 1382 break; 1383 } 1384 1385 case TIOCINQ: { 1386 struct sk_buff *skb; 1387 int amount = 0; 1388 /* 1389 * These two are safe on a single CPU system as 1390 * only user tasks fiddle here 1391 */ 1392 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1393 amount = skb->len; 1394 rc = put_user(amount, (unsigned int __user *)argp); 1395 break; 1396 } 1397 1398 case SIOCGSTAMP: 1399 rc = -EINVAL; 1400 if (sk) 1401 rc = sock_get_timestamp(sk, 1402 (struct timeval __user *)argp); 1403 break; 1404 case SIOCGSTAMPNS: 1405 rc = -EINVAL; 1406 if (sk) 1407 rc = sock_get_timestampns(sk, 1408 (struct timespec __user *)argp); 1409 break; 1410 case SIOCGIFADDR: 1411 case SIOCSIFADDR: 1412 case SIOCGIFDSTADDR: 1413 case SIOCSIFDSTADDR: 1414 case SIOCGIFBRDADDR: 1415 case SIOCSIFBRDADDR: 1416 case SIOCGIFNETMASK: 1417 case SIOCSIFNETMASK: 1418 case SIOCGIFMETRIC: 1419 case SIOCSIFMETRIC: 1420 rc = -EINVAL; 1421 break; 1422 case SIOCADDRT: 1423 case SIOCDELRT: 1424 rc = -EPERM; 1425 if (!capable(CAP_NET_ADMIN)) 1426 break; 1427 rc = x25_route_ioctl(cmd, argp); 1428 break; 1429 case SIOCX25GSUBSCRIP: 1430 rc = x25_subscr_ioctl(cmd, argp); 1431 break; 1432 case SIOCX25SSUBSCRIP: 1433 rc = -EPERM; 1434 if (!capable(CAP_NET_ADMIN)) 1435 break; 1436 rc = x25_subscr_ioctl(cmd, argp); 1437 break; 1438 case SIOCX25GFACILITIES: { 1439 struct x25_facilities fac = x25->facilities; 1440 rc = copy_to_user(argp, &fac, 1441 sizeof(fac)) ? -EFAULT : 0; 1442 break; 1443 } 1444 1445 case SIOCX25SFACILITIES: { 1446 struct x25_facilities facilities; 1447 rc = -EFAULT; 1448 if (copy_from_user(&facilities, argp, 1449 sizeof(facilities))) 1450 break; 1451 rc = -EINVAL; 1452 if (sk->sk_state != TCP_LISTEN && 1453 sk->sk_state != TCP_CLOSE) 1454 break; 1455 if (facilities.pacsize_in < X25_PS16 || 1456 facilities.pacsize_in > X25_PS4096) 1457 break; 1458 if (facilities.pacsize_out < X25_PS16 || 1459 facilities.pacsize_out > X25_PS4096) 1460 break; 1461 if (facilities.winsize_in < 1 || 1462 facilities.winsize_in > 127) 1463 break; 1464 if (facilities.throughput) { 1465 int out = facilities.throughput & 0xf0; 1466 int in = facilities.throughput & 0x0f; 1467 if (!out) 1468 facilities.throughput |= 1469 X25_DEFAULT_THROUGHPUT << 4; 1470 else if (out < 0x30 || out > 0xD0) 1471 break; 1472 if (!in) 1473 facilities.throughput |= 1474 X25_DEFAULT_THROUGHPUT; 1475 else if (in < 0x03 || in > 0x0D) 1476 break; 1477 } 1478 if (facilities.reverse && 1479 (facilities.reverse & 0x81) != 0x81) 1480 break; 1481 x25->facilities = facilities; 1482 rc = 0; 1483 break; 1484 } 1485 1486 case SIOCX25GDTEFACILITIES: { 1487 rc = copy_to_user(argp, &x25->dte_facilities, 1488 sizeof(x25->dte_facilities)); 1489 if (rc) 1490 rc = -EFAULT; 1491 break; 1492 } 1493 1494 case SIOCX25SDTEFACILITIES: { 1495 struct x25_dte_facilities dtefacs; 1496 rc = -EFAULT; 1497 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1498 break; 1499 rc = -EINVAL; 1500 if (sk->sk_state != TCP_LISTEN && 1501 sk->sk_state != TCP_CLOSE) 1502 break; 1503 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1504 break; 1505 if (dtefacs.calling_ae == NULL) 1506 break; 1507 if (dtefacs.called_len > X25_MAX_AE_LEN) 1508 break; 1509 if (dtefacs.called_ae == NULL) 1510 break; 1511 x25->dte_facilities = dtefacs; 1512 rc = 0; 1513 break; 1514 } 1515 1516 case SIOCX25GCALLUSERDATA: { 1517 struct x25_calluserdata cud = x25->calluserdata; 1518 rc = copy_to_user(argp, &cud, 1519 sizeof(cud)) ? -EFAULT : 0; 1520 break; 1521 } 1522 1523 case SIOCX25SCALLUSERDATA: { 1524 struct x25_calluserdata calluserdata; 1525 1526 rc = -EFAULT; 1527 if (copy_from_user(&calluserdata, argp, 1528 sizeof(calluserdata))) 1529 break; 1530 rc = -EINVAL; 1531 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1532 break; 1533 x25->calluserdata = calluserdata; 1534 rc = 0; 1535 break; 1536 } 1537 1538 case SIOCX25GCAUSEDIAG: { 1539 struct x25_causediag causediag; 1540 causediag = x25->causediag; 1541 rc = copy_to_user(argp, &causediag, 1542 sizeof(causediag)) ? -EFAULT : 0; 1543 break; 1544 } 1545 1546 case SIOCX25SCAUSEDIAG: { 1547 struct x25_causediag causediag; 1548 rc = -EFAULT; 1549 if (copy_from_user(&causediag, argp, sizeof(causediag))) 1550 break; 1551 x25->causediag = causediag; 1552 rc = 0; 1553 break; 1554 1555 } 1556 1557 case SIOCX25SCUDMATCHLEN: { 1558 struct x25_subaddr sub_addr; 1559 rc = -EINVAL; 1560 if(sk->sk_state != TCP_CLOSE) 1561 break; 1562 rc = -EFAULT; 1563 if (copy_from_user(&sub_addr, argp, 1564 sizeof(sub_addr))) 1565 break; 1566 rc = -EINVAL; 1567 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1568 break; 1569 x25->cudmatchlength = sub_addr.cudmatchlength; 1570 rc = 0; 1571 break; 1572 } 1573 1574 case SIOCX25CALLACCPTAPPRV: { 1575 rc = -EINVAL; 1576 if (sk->sk_state != TCP_CLOSE) 1577 break; 1578 clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags); 1579 rc = 0; 1580 break; 1581 } 1582 1583 case SIOCX25SENDCALLACCPT: { 1584 rc = -EINVAL; 1585 if (sk->sk_state != TCP_ESTABLISHED) 1586 break; 1587 /* must call accptapprv above */ 1588 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags)) 1589 break; 1590 x25_write_internal(sk, X25_CALL_ACCEPTED); 1591 x25->state = X25_STATE_3; 1592 rc = 0; 1593 break; 1594 } 1595 1596 default: 1597 rc = -ENOIOCTLCMD; 1598 break; 1599 } 1600 unlock_kernel(); 1601 1602 return rc; 1603 } 1604 1605 static const struct net_proto_family x25_family_ops = { 1606 .family = AF_X25, 1607 .create = x25_create, 1608 .owner = THIS_MODULE, 1609 }; 1610 1611 #ifdef CONFIG_COMPAT 1612 static int compat_x25_subscr_ioctl(unsigned int cmd, 1613 struct compat_x25_subscrip_struct __user *x25_subscr32) 1614 { 1615 struct compat_x25_subscrip_struct x25_subscr; 1616 struct x25_neigh *nb; 1617 struct net_device *dev; 1618 int rc = -EINVAL; 1619 1620 rc = -EFAULT; 1621 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1622 goto out; 1623 1624 rc = -EINVAL; 1625 dev = x25_dev_get(x25_subscr.device); 1626 if (dev == NULL) 1627 goto out; 1628 1629 nb = x25_get_neigh(dev); 1630 if (nb == NULL) 1631 goto out_dev_put; 1632 1633 dev_put(dev); 1634 1635 if (cmd == SIOCX25GSUBSCRIP) { 1636 x25_subscr.extended = nb->extended; 1637 x25_subscr.global_facil_mask = nb->global_facil_mask; 1638 rc = copy_to_user(x25_subscr32, &x25_subscr, 1639 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1640 } else { 1641 rc = -EINVAL; 1642 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1643 rc = 0; 1644 nb->extended = x25_subscr.extended; 1645 nb->global_facil_mask = x25_subscr.global_facil_mask; 1646 } 1647 } 1648 x25_neigh_put(nb); 1649 out: 1650 return rc; 1651 out_dev_put: 1652 dev_put(dev); 1653 goto out; 1654 } 1655 1656 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1657 unsigned long arg) 1658 { 1659 void __user *argp = compat_ptr(arg); 1660 struct sock *sk = sock->sk; 1661 1662 int rc = -ENOIOCTLCMD; 1663 1664 switch(cmd) { 1665 case TIOCOUTQ: 1666 case TIOCINQ: 1667 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1668 break; 1669 case SIOCGSTAMP: 1670 rc = -EINVAL; 1671 lock_kernel(); 1672 if (sk) 1673 rc = compat_sock_get_timestamp(sk, 1674 (struct timeval __user*)argp); 1675 unlock_kernel(); 1676 break; 1677 case SIOCGSTAMPNS: 1678 rc = -EINVAL; 1679 lock_kernel(); 1680 if (sk) 1681 rc = compat_sock_get_timestampns(sk, 1682 (struct timespec __user*)argp); 1683 unlock_kernel(); 1684 break; 1685 case SIOCGIFADDR: 1686 case SIOCSIFADDR: 1687 case SIOCGIFDSTADDR: 1688 case SIOCSIFDSTADDR: 1689 case SIOCGIFBRDADDR: 1690 case SIOCSIFBRDADDR: 1691 case SIOCGIFNETMASK: 1692 case SIOCSIFNETMASK: 1693 case SIOCGIFMETRIC: 1694 case SIOCSIFMETRIC: 1695 rc = -EINVAL; 1696 break; 1697 case SIOCADDRT: 1698 case SIOCDELRT: 1699 rc = -EPERM; 1700 if (!capable(CAP_NET_ADMIN)) 1701 break; 1702 lock_kernel(); 1703 rc = x25_route_ioctl(cmd, argp); 1704 unlock_kernel(); 1705 break; 1706 case SIOCX25GSUBSCRIP: 1707 lock_kernel(); 1708 rc = compat_x25_subscr_ioctl(cmd, argp); 1709 unlock_kernel(); 1710 break; 1711 case SIOCX25SSUBSCRIP: 1712 rc = -EPERM; 1713 if (!capable(CAP_NET_ADMIN)) 1714 break; 1715 lock_kernel(); 1716 rc = compat_x25_subscr_ioctl(cmd, argp); 1717 unlock_kernel(); 1718 break; 1719 case SIOCX25GFACILITIES: 1720 case SIOCX25SFACILITIES: 1721 case SIOCX25GDTEFACILITIES: 1722 case SIOCX25SDTEFACILITIES: 1723 case SIOCX25GCALLUSERDATA: 1724 case SIOCX25SCALLUSERDATA: 1725 case SIOCX25GCAUSEDIAG: 1726 case SIOCX25SCAUSEDIAG: 1727 case SIOCX25SCUDMATCHLEN: 1728 case SIOCX25CALLACCPTAPPRV: 1729 case SIOCX25SENDCALLACCPT: 1730 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1731 break; 1732 default: 1733 rc = -ENOIOCTLCMD; 1734 break; 1735 } 1736 return rc; 1737 } 1738 #endif 1739 1740 static const struct proto_ops x25_proto_ops = { 1741 .family = AF_X25, 1742 .owner = THIS_MODULE, 1743 .release = x25_release, 1744 .bind = x25_bind, 1745 .connect = x25_connect, 1746 .socketpair = sock_no_socketpair, 1747 .accept = x25_accept, 1748 .getname = x25_getname, 1749 .poll = x25_datagram_poll, 1750 .ioctl = x25_ioctl, 1751 #ifdef CONFIG_COMPAT 1752 .compat_ioctl = compat_x25_ioctl, 1753 #endif 1754 .listen = x25_listen, 1755 .shutdown = sock_no_shutdown, 1756 .setsockopt = x25_setsockopt, 1757 .getsockopt = x25_getsockopt, 1758 .sendmsg = x25_sendmsg, 1759 .recvmsg = x25_recvmsg, 1760 .mmap = sock_no_mmap, 1761 .sendpage = sock_no_sendpage, 1762 }; 1763 1764 static struct packet_type x25_packet_type __read_mostly = { 1765 .type = cpu_to_be16(ETH_P_X25), 1766 .func = x25_lapb_receive_frame, 1767 }; 1768 1769 static struct notifier_block x25_dev_notifier = { 1770 .notifier_call = x25_device_event, 1771 }; 1772 1773 void x25_kill_by_neigh(struct x25_neigh *nb) 1774 { 1775 struct sock *s; 1776 struct hlist_node *node; 1777 1778 write_lock_bh(&x25_list_lock); 1779 1780 sk_for_each(s, node, &x25_list) 1781 if (x25_sk(s)->neighbour == nb) 1782 x25_disconnect(s, ENETUNREACH, 0, 0); 1783 1784 write_unlock_bh(&x25_list_lock); 1785 1786 /* Remove any related forwards */ 1787 x25_clear_forward_by_dev(nb->dev); 1788 } 1789 1790 static int __init x25_init(void) 1791 { 1792 int rc = proto_register(&x25_proto, 0); 1793 1794 if (rc != 0) 1795 goto out; 1796 1797 rc = sock_register(&x25_family_ops); 1798 if (rc != 0) 1799 goto out_proto; 1800 1801 dev_add_pack(&x25_packet_type); 1802 1803 rc = register_netdevice_notifier(&x25_dev_notifier); 1804 if (rc != 0) 1805 goto out_sock; 1806 1807 printk(KERN_INFO "X.25 for Linux Version 0.2\n"); 1808 1809 x25_register_sysctl(); 1810 rc = x25_proc_init(); 1811 if (rc != 0) 1812 goto out_dev; 1813 out: 1814 return rc; 1815 out_dev: 1816 unregister_netdevice_notifier(&x25_dev_notifier); 1817 out_sock: 1818 sock_unregister(AF_X25); 1819 out_proto: 1820 proto_unregister(&x25_proto); 1821 goto out; 1822 } 1823 module_init(x25_init); 1824 1825 static void __exit x25_exit(void) 1826 { 1827 x25_proc_exit(); 1828 x25_link_free(); 1829 x25_route_free(); 1830 1831 x25_unregister_sysctl(); 1832 1833 unregister_netdevice_notifier(&x25_dev_notifier); 1834 1835 dev_remove_pack(&x25_packet_type); 1836 1837 sock_unregister(AF_X25); 1838 proto_unregister(&x25_proto); 1839 } 1840 module_exit(x25_exit); 1841 1842 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1843 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1844 MODULE_LICENSE("GPL"); 1845 MODULE_ALIAS_NETPROTO(PF_X25); 1846