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/timer.h> 44#include <linux/string.h> 45#include <linux/net.h> 46#include <linux/netdevice.h> 47#include <linux/if_arp.h> 48#include <linux/skbuff.h> 49#include <net/sock.h> 50#include <net/tcp_states.h> 51#include <asm/uaccess.h> 52#include <linux/fcntl.h> 53#include <linux/termios.h> /* For TIOCINQ/OUTQ */ 54#include <linux/notifier.h> 55#include <linux/init.h> 56#include <linux/compat.h> 57 58#include <net/x25.h> 59#include <net/compat.h> 60 61int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20; 62int sysctl_x25_call_request_timeout = X25_DEFAULT_T21; 63int sysctl_x25_reset_request_timeout = X25_DEFAULT_T22; 64int sysctl_x25_clear_request_timeout = X25_DEFAULT_T23; 65int sysctl_x25_ack_holdback_timeout = X25_DEFAULT_T2; 66int sysctl_x25_forward = 0; 67 68HLIST_HEAD(x25_list); 69DEFINE_RWLOCK(x25_list_lock); 70 71static const struct proto_ops x25_proto_ops; 72 73static struct x25_address null_x25_address = {" "}; 74 75#ifdef CONFIG_COMPAT 76struct compat_x25_subscrip_struct { 77 char device[200-sizeof(compat_ulong_t)]; 78 compat_ulong_t global_facil_mask; 79 compat_uint_t extended; 80}; 81#endif 82 83int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr, 84 struct x25_address *calling_addr) 85{ 86 int called_len, calling_len; 87 char *called, *calling; 88 int i; 89 90 called_len = (*p >> 0) & 0x0F; 91 calling_len = (*p >> 4) & 0x0F; 92 93 called = called_addr->x25_addr; 94 calling = calling_addr->x25_addr; 95 p++; 96 97 for (i = 0; i < (called_len + calling_len); i++) { 98 if (i < called_len) { 99 if (i % 2 != 0) { 100 *called++ = ((*p >> 0) & 0x0F) + '0'; 101 p++; 102 } else { 103 *called++ = ((*p >> 4) & 0x0F) + '0'; 104 } 105 } else { 106 if (i % 2 != 0) { 107 *calling++ = ((*p >> 0) & 0x0F) + '0'; 108 p++; 109 } else { 110 *calling++ = ((*p >> 4) & 0x0F) + '0'; 111 } 112 } 113 } 114 115 *called = *calling = '\0'; 116 117 return 1 + (called_len + calling_len + 1) / 2; 118} 119 120int x25_addr_aton(unsigned char *p, struct x25_address *called_addr, 121 struct x25_address *calling_addr) 122{ 123 unsigned int called_len, calling_len; 124 char *called, *calling; 125 int i; 126 127 called = called_addr->x25_addr; 128 calling = calling_addr->x25_addr; 129 130 called_len = strlen(called); 131 calling_len = strlen(calling); 132 133 *p++ = (calling_len << 4) | (called_len << 0); 134 135 for (i = 0; i < (called_len + calling_len); i++) { 136 if (i < called_len) { 137 if (i % 2 != 0) { 138 *p |= (*called++ - '0') << 0; 139 p++; 140 } else { 141 *p = 0x00; 142 *p |= (*called++ - '0') << 4; 143 } 144 } else { 145 if (i % 2 != 0) { 146 *p |= (*calling++ - '0') << 0; 147 p++; 148 } else { 149 *p = 0x00; 150 *p |= (*calling++ - '0') << 4; 151 } 152 } 153 } 154 155 return 1 + (called_len + calling_len + 1) / 2; 156} 157 158/* 159 * Socket removal during an interrupt is now safe. 160 */ 161static void x25_remove_socket(struct sock *sk) 162{ 163 write_lock_bh(&x25_list_lock); 164 sk_del_node_init(sk); 165 write_unlock_bh(&x25_list_lock); 166} 167 168/* 169 * Kill all bound sockets on a dropped device. 170 */ 171static void x25_kill_by_device(struct net_device *dev) 172{ 173 struct sock *s; 174 struct hlist_node *node; 175 176 write_lock_bh(&x25_list_lock); 177 178 sk_for_each(s, node, &x25_list) 179 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev) 180 x25_disconnect(s, ENETUNREACH, 0, 0); 181 182 write_unlock_bh(&x25_list_lock); 183} 184 185/* 186 * Handle device status changes. 187 */ 188static int x25_device_event(struct notifier_block *this, unsigned long event, 189 void *ptr) 190{ 191 struct net_device *dev = ptr; 192 struct x25_neigh *nb; 193 194 if (dev->type == ARPHRD_X25 195#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE) 196 || dev->type == ARPHRD_ETHER 197#endif 198 ) { 199 switch (event) { 200 case NETDEV_UP: 201 x25_link_device_up(dev); 202 break; 203 case NETDEV_GOING_DOWN: 204 nb = x25_get_neigh(dev); 205 if (nb) { 206 x25_terminate_link(nb); 207 x25_neigh_put(nb); 208 } 209 break; 210 case NETDEV_DOWN: 211 x25_kill_by_device(dev); 212 x25_route_device_down(dev); 213 x25_link_device_down(dev); 214 break; 215 } 216 } 217 218 return NOTIFY_DONE; 219} 220 221/* 222 * Add a socket to the bound sockets list. 223 */ 224static void x25_insert_socket(struct sock *sk) 225{ 226 write_lock_bh(&x25_list_lock); 227 sk_add_node(sk, &x25_list); 228 write_unlock_bh(&x25_list_lock); 229} 230 231/* 232 * Find a socket that wants to accept the Call Request we just 233 * received. Check the full list for an address/cud match. 234 * If no cuds match return the next_best thing, an address match. 235 * Note: if a listening socket has cud set it must only get calls 236 * with matching cud. 237 */ 238static struct sock *x25_find_listener(struct x25_address *addr, 239 struct sk_buff *skb) 240{ 241 struct sock *s; 242 struct sock *next_best; 243 struct hlist_node *node; 244 245 read_lock_bh(&x25_list_lock); 246 next_best = NULL; 247 248 sk_for_each(s, node, &x25_list) 249 if ((!strcmp(addr->x25_addr, 250 x25_sk(s)->source_addr.x25_addr) || 251 !strcmp(addr->x25_addr, 252 null_x25_address.x25_addr)) && 253 s->sk_state == TCP_LISTEN) { 254 /* 255 * Found a listening socket, now check the incoming 256 * call user data vs this sockets call user data 257 */ 258 if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) { 259 if((memcmp(x25_sk(s)->calluserdata.cuddata, 260 skb->data, 261 x25_sk(s)->cudmatchlength)) == 0) { 262 sock_hold(s); 263 goto found; 264 } 265 } else 266 next_best = s; 267 } 268 if (next_best) { 269 s = next_best; 270 sock_hold(s); 271 goto found; 272 } 273 s = NULL; 274found: 275 read_unlock_bh(&x25_list_lock); 276 return s; 277} 278 279/* 280 * Find a connected X.25 socket given my LCI and neighbour. 281 */ 282static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb) 283{ 284 struct sock *s; 285 struct hlist_node *node; 286 287 sk_for_each(s, node, &x25_list) 288 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) { 289 sock_hold(s); 290 goto found; 291 } 292 s = NULL; 293found: 294 return s; 295} 296 297struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb) 298{ 299 struct sock *s; 300 301 read_lock_bh(&x25_list_lock); 302 s = __x25_find_socket(lci, nb); 303 read_unlock_bh(&x25_list_lock); 304 return s; 305} 306 307/* 308 * Find a unique LCI for a given device. 309 */ 310static unsigned int x25_new_lci(struct x25_neigh *nb) 311{ 312 unsigned int lci = 1; 313 struct sock *sk; 314 315 read_lock_bh(&x25_list_lock); 316 317 while ((sk = __x25_find_socket(lci, nb)) != NULL) { 318 sock_put(sk); 319 if (++lci == 4096) { 320 lci = 0; 321 break; 322 } 323 } 324 325 read_unlock_bh(&x25_list_lock); 326 return lci; 327} 328 329/* 330 * Deferred destroy. 331 */ 332void x25_destroy_socket(struct sock *); 333 334/* 335 * handler for deferred kills. 336 */ 337static void x25_destroy_timer(unsigned long data) 338{ 339 x25_destroy_socket((struct sock *)data); 340} 341 342/* 343 * This is called from user mode and the timers. Thus it protects itself 344 * against interrupt users but doesn't worry about being called during 345 * work. Once it is removed from the queue no interrupt or bottom half 346 * will touch it and we are (fairly 8-) ) safe. 347 * Not static as it's used by the timer 348 */ 349void x25_destroy_socket(struct sock *sk) 350{ 351 struct sk_buff *skb; 352 353 sock_hold(sk); 354 lock_sock(sk); 355 x25_stop_heartbeat(sk); 356 x25_stop_timer(sk); 357 358 x25_remove_socket(sk); 359 x25_clear_queues(sk); /* Flush the queues */ 360 361 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 362 if (skb->sk != sk) { /* A pending connection */ 363 /* 364 * Queue the unaccepted socket for death 365 */ 366 sock_set_flag(skb->sk, SOCK_DEAD); 367 x25_start_heartbeat(skb->sk); 368 x25_sk(skb->sk)->state = X25_STATE_0; 369 } 370 371 kfree_skb(skb); 372 } 373 374 if (atomic_read(&sk->sk_wmem_alloc) || 375 atomic_read(&sk->sk_rmem_alloc)) { 376 /* Defer: outstanding buffers */ 377 sk->sk_timer.expires = jiffies + 10 * HZ; 378 sk->sk_timer.function = x25_destroy_timer; 379 sk->sk_timer.data = (unsigned long)sk; 380 add_timer(&sk->sk_timer); 381 } else { 382 /* drop last reference so sock_put will free */ 383 __sock_put(sk); 384 } 385 386 release_sock(sk); 387 sock_put(sk); 388} 389 390/* 391 * Handling for system calls applied via the various interfaces to a 392 * X.25 socket object. 393 */ 394 395static int x25_setsockopt(struct socket *sock, int level, int optname, 396 char __user *optval, int optlen) 397{ 398 int opt; 399 struct sock *sk = sock->sk; 400 int rc = -ENOPROTOOPT; 401 402 if (level != SOL_X25 || optname != X25_QBITINCL) 403 goto out; 404 405 rc = -EINVAL; 406 if (optlen < sizeof(int)) 407 goto out; 408 409 rc = -EFAULT; 410 if (get_user(opt, (int __user *)optval)) 411 goto out; 412 413 x25_sk(sk)->qbitincl = !!opt; 414 rc = 0; 415out: 416 return rc; 417} 418 419static int x25_getsockopt(struct socket *sock, int level, int optname, 420 char __user *optval, int __user *optlen) 421{ 422 struct sock *sk = sock->sk; 423 int val, len, rc = -ENOPROTOOPT; 424 425 if (level != SOL_X25 || optname != X25_QBITINCL) 426 goto out; 427 428 rc = -EFAULT; 429 if (get_user(len, optlen)) 430 goto out; 431 432 len = min_t(unsigned int, len, sizeof(int)); 433 434 rc = -EINVAL; 435 if (len < 0) 436 goto out; 437 438 rc = -EFAULT; 439 if (put_user(len, optlen)) 440 goto out; 441 442 val = x25_sk(sk)->qbitincl; 443 rc = copy_to_user(optval, &val, len) ? -EFAULT : 0; 444out: 445 return rc; 446} 447 448static int x25_listen(struct socket *sock, int backlog) 449{ 450 struct sock *sk = sock->sk; 451 int rc = -EOPNOTSUPP; 452 453 if (sk->sk_state != TCP_LISTEN) { 454 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); 455 sk->sk_max_ack_backlog = backlog; 456 sk->sk_state = TCP_LISTEN; 457 rc = 0; 458 } 459 460 return rc; 461} 462 463static struct proto x25_proto = { 464 .name = "X25", 465 .owner = THIS_MODULE, 466 .obj_size = sizeof(struct x25_sock), 467}; 468 469static struct sock *x25_alloc_socket(void) 470{ 471 struct x25_sock *x25; 472 struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1); 473 474 if (!sk) 475 goto out; 476 477 sock_init_data(NULL, sk); 478 479 x25 = x25_sk(sk); 480 skb_queue_head_init(&x25->ack_queue); 481 skb_queue_head_init(&x25->fragment_queue); 482 skb_queue_head_init(&x25->interrupt_in_queue); 483 skb_queue_head_init(&x25->interrupt_out_queue); 484out: 485 return sk; 486} 487 488static int x25_create(struct socket *sock, int protocol) 489{ 490 struct sock *sk; 491 struct x25_sock *x25; 492 int rc = -ESOCKTNOSUPPORT; 493 494 if (sock->type != SOCK_SEQPACKET || protocol) 495 goto out; 496 497 rc = -ENOMEM; 498 if ((sk = x25_alloc_socket()) == NULL) 499 goto out; 500 501 x25 = x25_sk(sk); 502 503 sock_init_data(sock, sk); 504 505 x25_init_timers(sk); 506 507 sock->ops = &x25_proto_ops; 508 sk->sk_protocol = protocol; 509 sk->sk_backlog_rcv = x25_backlog_rcv; 510 511 x25->t21 = sysctl_x25_call_request_timeout; 512 x25->t22 = sysctl_x25_reset_request_timeout; 513 x25->t23 = sysctl_x25_clear_request_timeout; 514 x25->t2 = sysctl_x25_ack_holdback_timeout; 515 x25->state = X25_STATE_0; 516 x25->cudmatchlength = 0; 517 x25->accptapprv = X25_DENY_ACCPT_APPRV; /* normally no cud */ 518 /* on call accept */ 519 520 x25->facilities.winsize_in = X25_DEFAULT_WINDOW_SIZE; 521 x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE; 522 x25->facilities.pacsize_in = X25_DEFAULT_PACKET_SIZE; 523 x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE; 524 x25->facilities.throughput = X25_DEFAULT_THROUGHPUT; 525 x25->facilities.reverse = X25_DEFAULT_REVERSE; 526 x25->dte_facilities.calling_len = 0; 527 x25->dte_facilities.called_len = 0; 528 memset(x25->dte_facilities.called_ae, '\0', 529 sizeof(x25->dte_facilities.called_ae)); 530 memset(x25->dte_facilities.calling_ae, '\0', 531 sizeof(x25->dte_facilities.calling_ae)); 532 533 rc = 0; 534out: 535 return rc; 536} 537 538static struct sock *x25_make_new(struct sock *osk) 539{ 540 struct sock *sk = NULL; 541 struct x25_sock *x25, *ox25; 542 543 if (osk->sk_type != SOCK_SEQPACKET) 544 goto out; 545 546 if ((sk = x25_alloc_socket()) == NULL) 547 goto out; 548 549 x25 = x25_sk(sk); 550 551 sk->sk_type = osk->sk_type; 552 sk->sk_socket = osk->sk_socket; 553 sk->sk_priority = osk->sk_priority; 554 sk->sk_protocol = osk->sk_protocol; 555 sk->sk_rcvbuf = osk->sk_rcvbuf; 556 sk->sk_sndbuf = osk->sk_sndbuf; 557 sk->sk_state = TCP_ESTABLISHED; 558 sk->sk_sleep = osk->sk_sleep; 559 sk->sk_backlog_rcv = osk->sk_backlog_rcv; 560 sock_copy_flags(sk, osk); 561 562 ox25 = x25_sk(osk); 563 x25->t21 = ox25->t21; 564 x25->t22 = ox25->t22; 565 x25->t23 = ox25->t23; 566 x25->t2 = ox25->t2; 567 x25->facilities = ox25->facilities; 568 x25->qbitincl = ox25->qbitincl; 569 x25->dte_facilities = ox25->dte_facilities; 570 x25->cudmatchlength = ox25->cudmatchlength; 571 x25->accptapprv = ox25->accptapprv; 572 573 x25_init_timers(sk); 574out: 575 return sk; 576} 577 578static int x25_release(struct socket *sock) 579{ 580 struct sock *sk = sock->sk; 581 struct x25_sock *x25; 582 583 if (!sk) 584 goto out; 585 586 x25 = x25_sk(sk); 587 588 switch (x25->state) { 589 590 case X25_STATE_0: 591 case X25_STATE_2: 592 x25_disconnect(sk, 0, 0, 0); 593 x25_destroy_socket(sk); 594 goto out; 595 596 case X25_STATE_1: 597 case X25_STATE_3: 598 case X25_STATE_4: 599 x25_clear_queues(sk); 600 x25_write_internal(sk, X25_CLEAR_REQUEST); 601 x25_start_t23timer(sk); 602 x25->state = X25_STATE_2; 603 sk->sk_state = TCP_CLOSE; 604 sk->sk_shutdown |= SEND_SHUTDOWN; 605 sk->sk_state_change(sk); 606 sock_set_flag(sk, SOCK_DEAD); 607 sock_set_flag(sk, SOCK_DESTROY); 608 break; 609 } 610 611 sock->sk = NULL; 612 sk->sk_socket = NULL; /* Not used, but we should do this */ 613out: 614 return 0; 615} 616 617static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 618{ 619 struct sock *sk = sock->sk; 620 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 621 622 if (!sock_flag(sk, SOCK_ZAPPED) || 623 addr_len != sizeof(struct sockaddr_x25) || 624 addr->sx25_family != AF_X25) 625 return -EINVAL; 626 627 x25_sk(sk)->source_addr = addr->sx25_addr; 628 x25_insert_socket(sk); 629 sock_reset_flag(sk, SOCK_ZAPPED); 630 SOCK_DEBUG(sk, "x25_bind: socket is bound\n"); 631 632 return 0; 633} 634 635static int x25_wait_for_connection_establishment(struct sock *sk) 636{ 637 DECLARE_WAITQUEUE(wait, current); 638 int rc; 639 640 add_wait_queue_exclusive(sk->sk_sleep, &wait); 641 for (;;) { 642 __set_current_state(TASK_INTERRUPTIBLE); 643 rc = -ERESTARTSYS; 644 if (signal_pending(current)) 645 break; 646 rc = sock_error(sk); 647 if (rc) { 648 sk->sk_socket->state = SS_UNCONNECTED; 649 break; 650 } 651 rc = 0; 652 if (sk->sk_state != TCP_ESTABLISHED) { 653 release_sock(sk); 654 schedule(); 655 lock_sock(sk); 656 } else 657 break; 658 } 659 __set_current_state(TASK_RUNNING); 660 remove_wait_queue(sk->sk_sleep, &wait); 661 return rc; 662} 663 664static int x25_connect(struct socket *sock, struct sockaddr *uaddr, 665 int addr_len, int flags) 666{ 667 struct sock *sk = sock->sk; 668 struct x25_sock *x25 = x25_sk(sk); 669 struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr; 670 struct x25_route *rt; 671 int rc = 0; 672 673 lock_sock(sk); 674 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 675 sock->state = SS_CONNECTED; 676 goto out; /* Connect completed during a ERESTARTSYS event */ 677 } 678 679 rc = -ECONNREFUSED; 680 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 681 sock->state = SS_UNCONNECTED; 682 goto out; 683 } 684 685 rc = -EISCONN; /* No reconnect on a seqpacket socket */ 686 if (sk->sk_state == TCP_ESTABLISHED) 687 goto out; 688 689 sk->sk_state = TCP_CLOSE; 690 sock->state = SS_UNCONNECTED; 691 692 rc = -EINVAL; 693 if (addr_len != sizeof(struct sockaddr_x25) || 694 addr->sx25_family != AF_X25) 695 goto out; 696 697 rc = -ENETUNREACH; 698 rt = x25_get_route(&addr->sx25_addr); 699 if (!rt) 700 goto out; 701 702 x25->neighbour = x25_get_neigh(rt->dev); 703 if (!x25->neighbour) 704 goto out_put_route; 705 706 x25_limit_facilities(&x25->facilities, x25->neighbour); 707 708 x25->lci = x25_new_lci(x25->neighbour); 709 if (!x25->lci) 710 goto out_put_neigh; 711 712 rc = -EINVAL; 713 if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ 714 goto out_put_neigh; 715 716 if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr)) 717 memset(&x25->source_addr, '\0', X25_ADDR_LEN); 718 719 x25->dest_addr = addr->sx25_addr; 720 721 /* Move to connecting socket, start sending Connect Requests */ 722 sock->state = SS_CONNECTING; 723 sk->sk_state = TCP_SYN_SENT; 724 725 x25->state = X25_STATE_1; 726 727 x25_write_internal(sk, X25_CALL_REQUEST); 728 729 x25_start_heartbeat(sk); 730 x25_start_t21timer(sk); 731 732 /* Now the loop */ 733 rc = -EINPROGRESS; 734 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) 735 goto out_put_neigh; 736 737 rc = x25_wait_for_connection_establishment(sk); 738 if (rc) 739 goto out_put_neigh; 740 741 sock->state = SS_CONNECTED; 742 rc = 0; 743out_put_neigh: 744 if (rc) 745 x25_neigh_put(x25->neighbour); 746out_put_route: 747 x25_route_put(rt); 748out: 749 release_sock(sk); 750 return rc; 751} 752 753static int x25_wait_for_data(struct sock *sk, long timeout) 754{ 755 DECLARE_WAITQUEUE(wait, current); 756 int rc = 0; 757 758 add_wait_queue_exclusive(sk->sk_sleep, &wait); 759 for (;;) { 760 __set_current_state(TASK_INTERRUPTIBLE); 761 if (sk->sk_shutdown & RCV_SHUTDOWN) 762 break; 763 rc = -ERESTARTSYS; 764 if (signal_pending(current)) 765 break; 766 rc = -EAGAIN; 767 if (!timeout) 768 break; 769 rc = 0; 770 if (skb_queue_empty(&sk->sk_receive_queue)) { 771 release_sock(sk); 772 timeout = schedule_timeout(timeout); 773 lock_sock(sk); 774 } else 775 break; 776 } 777 __set_current_state(TASK_RUNNING); 778 remove_wait_queue(sk->sk_sleep, &wait); 779 return rc; 780} 781 782static int x25_accept(struct socket *sock, struct socket *newsock, int flags) 783{ 784 struct sock *sk = sock->sk; 785 struct sock *newsk; 786 struct sk_buff *skb; 787 int rc = -EINVAL; 788 789 if (!sk || sk->sk_state != TCP_LISTEN) 790 goto out; 791 792 rc = -EOPNOTSUPP; 793 if (sk->sk_type != SOCK_SEQPACKET) 794 goto out; 795 796 lock_sock(sk); 797 rc = x25_wait_for_data(sk, sk->sk_rcvtimeo); 798 if (rc) 799 goto out2; 800 skb = skb_dequeue(&sk->sk_receive_queue); 801 rc = -EINVAL; 802 if (!skb->sk) 803 goto out2; 804 newsk = skb->sk; 805 newsk->sk_socket = newsock; 806 newsk->sk_sleep = &newsock->wait; 807 808 /* Now attach up the new socket */ 809 skb->sk = NULL; 810 kfree_skb(skb); 811 sk->sk_ack_backlog--; 812 newsock->sk = newsk; 813 newsock->state = SS_CONNECTED; 814 rc = 0; 815out2: 816 release_sock(sk); 817out: 818 return rc; 819} 820 821static int x25_getname(struct socket *sock, struct sockaddr *uaddr, 822 int *uaddr_len, int peer) 823{ 824 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr; 825 struct sock *sk = sock->sk; 826 struct x25_sock *x25 = x25_sk(sk); 827 828 if (peer) { 829 if (sk->sk_state != TCP_ESTABLISHED) 830 return -ENOTCONN; 831 sx25->sx25_addr = x25->dest_addr; 832 } else 833 sx25->sx25_addr = x25->source_addr; 834 835 sx25->sx25_family = AF_X25; 836 *uaddr_len = sizeof(*sx25); 837 838 return 0; 839} 840 841int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, 842 unsigned int lci) 843{ 844 struct sock *sk; 845 struct sock *make; 846 struct x25_sock *makex25; 847 struct x25_address source_addr, dest_addr; 848 struct x25_facilities facilities; 849 struct x25_dte_facilities dte_facilities; 850 int len, addr_len, rc; 851 852 /* 853 * Remove the LCI and frame type. 854 */ 855 skb_pull(skb, X25_STD_MIN_LEN); 856 857 /* 858 * Extract the X.25 addresses and convert them to ASCII strings, 859 * and remove them. 860 */ 861 addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr); 862 skb_pull(skb, addr_len); 863 864 /* 865 * Get the length of the facilities, skip past them for the moment 866 * get the call user data because this is needed to determine 867 * the correct listener 868 */ 869 len = skb->data[0] + 1; 870 skb_pull(skb,len); 871 872 /* 873 * Find a listener for the particular address/cud pair. 874 */ 875 sk = x25_find_listener(&source_addr,skb); 876 skb_push(skb,len); 877 878 if (sk != NULL && sk_acceptq_is_full(sk)) { 879 goto out_sock_put; 880 } 881 882 /* 883 * We dont have any listeners for this incoming call. 884 * Try forwarding it. 885 */ 886 if (sk == NULL) { 887 skb_push(skb, addr_len + X25_STD_MIN_LEN); 888 if (sysctl_x25_forward && 889 x25_forward_call(&dest_addr, nb, skb, lci) > 0) 890 { 891 /* Call was forwarded, dont process it any more */ 892 kfree_skb(skb); 893 rc = 1; 894 goto out; 895 } else { 896 /* No listeners, can't forward, clear the call */ 897 goto out_clear_request; 898 } 899 } 900 901 /* 902 * Try to reach a compromise on the requested facilities. 903 */ 904 len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities); 905 if (len == -1) 906 goto out_sock_put; 907 908 /* 909 * current neighbour/link might impose additional limits 910 * on certain facilties 911 */ 912 913 x25_limit_facilities(&facilities, nb); 914 915 /* 916 * Try to create a new socket. 917 */ 918 make = x25_make_new(sk); 919 if (!make) 920 goto out_sock_put; 921 922 /* 923 * Remove the facilities 924 */ 925 skb_pull(skb, len); 926 927 skb->sk = make; 928 make->sk_state = TCP_ESTABLISHED; 929 930 makex25 = x25_sk(make); 931 makex25->lci = lci; 932 makex25->dest_addr = dest_addr; 933 makex25->source_addr = source_addr; 934 makex25->neighbour = nb; 935 makex25->facilities = facilities; 936 makex25->dte_facilities= dte_facilities; 937 makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask; 938 /* ensure no reverse facil on accept */ 939 makex25->vc_facil_mask &= ~X25_MASK_REVERSE; 940 /* ensure no calling address extension on accept */ 941 makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE; 942 makex25->cudmatchlength = x25_sk(sk)->cudmatchlength; 943 944 /* Normally all calls are accepted immediatly */ 945 if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) { 946 x25_write_internal(make, X25_CALL_ACCEPTED); 947 makex25->state = X25_STATE_3; 948 } 949 950 /* 951 * Incoming Call User Data. 952 */ 953 if (skb->len >= 0) { 954 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len); 955 makex25->calluserdata.cudlength = skb->len; 956 } 957 958 sk->sk_ack_backlog++; 959 960 x25_insert_socket(make); 961 962 skb_queue_head(&sk->sk_receive_queue, skb); 963 964 x25_start_heartbeat(make); 965 966 if (!sock_flag(sk, SOCK_DEAD)) 967 sk->sk_data_ready(sk, skb->len); 968 rc = 1; 969 sock_put(sk); 970out: 971 return rc; 972out_sock_put: 973 sock_put(sk); 974out_clear_request: 975 rc = 0; 976 x25_transmit_clear_request(nb, lci, 0x01); 977 goto out; 978} 979 980static int x25_sendmsg(struct kiocb *iocb, struct socket *sock, 981 struct msghdr *msg, size_t len) 982{ 983 struct sock *sk = sock->sk; 984 struct x25_sock *x25 = x25_sk(sk); 985 struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name; 986 struct sockaddr_x25 sx25; 987 struct sk_buff *skb; 988 unsigned char *asmptr; 989 int noblock = msg->msg_flags & MSG_DONTWAIT; 990 size_t size; 991 int qbit = 0, rc = -EINVAL; 992 993 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT)) 994 goto out; 995 996 /* we currently don't support segmented records at the user interface */ 997 if (!(msg->msg_flags & (MSG_EOR|MSG_OOB))) 998 goto out; 999 1000 rc = -EADDRNOTAVAIL; 1001 if (sock_flag(sk, SOCK_ZAPPED)) 1002 goto out; 1003 1004 rc = -EPIPE; 1005 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1006 send_sig(SIGPIPE, current, 0); 1007 goto out; 1008 } 1009 1010 rc = -ENETUNREACH; 1011 if (!x25->neighbour) 1012 goto out; 1013 1014 if (usx25) { 1015 rc = -EINVAL; 1016 if (msg->msg_namelen < sizeof(sx25)) 1017 goto out; 1018 memcpy(&sx25, usx25, sizeof(sx25)); 1019 rc = -EISCONN; 1020 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr)) 1021 goto out; 1022 rc = -EINVAL; 1023 if (sx25.sx25_family != AF_X25) 1024 goto out; 1025 } else { 1026 rc = -ENOTCONN; 1027 if (sk->sk_state != TCP_ESTABLISHED) 1028 goto out; 1029 1030 sx25.sx25_family = AF_X25; 1031 sx25.sx25_addr = x25->dest_addr; 1032 } 1033 1034 SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n"); 1035 1036 /* Build a packet */ 1037 SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n"); 1038 1039 if ((msg->msg_flags & MSG_OOB) && len > 32) 1040 len = 32; 1041 1042 size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN; 1043 1044 skb = sock_alloc_send_skb(sk, size, noblock, &rc); 1045 if (!skb) 1046 goto out; 1047 X25_SKB_CB(skb)->flags = msg->msg_flags; 1048 1049 skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN); 1050 1051 /* 1052 * Put the data on the end 1053 */ 1054 SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n"); 1055 1056 skb_reset_transport_header(skb); 1057 skb_put(skb, len); 1058 1059 rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len); 1060 if (rc) 1061 goto out_kfree_skb; 1062 1063 /* 1064 * If the Q BIT Include socket option is in force, the first 1065 * byte of the user data is the logical value of the Q Bit. 1066 */ 1067 if (x25->qbitincl) { 1068 qbit = skb->data[0]; 1069 skb_pull(skb, 1); 1070 } 1071 1072 /* 1073 * Push down the X.25 header 1074 */ 1075 SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n"); 1076 1077 if (msg->msg_flags & MSG_OOB) { 1078 if (x25->neighbour->extended) { 1079 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1080 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1081 *asmptr++ = (x25->lci >> 0) & 0xFF; 1082 *asmptr++ = X25_INTERRUPT; 1083 } else { 1084 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1085 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1086 *asmptr++ = (x25->lci >> 0) & 0xFF; 1087 *asmptr++ = X25_INTERRUPT; 1088 } 1089 } else { 1090 if (x25->neighbour->extended) { 1091 /* Build an Extended X.25 header */ 1092 asmptr = skb_push(skb, X25_EXT_MIN_LEN); 1093 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ; 1094 *asmptr++ = (x25->lci >> 0) & 0xFF; 1095 *asmptr++ = X25_DATA; 1096 *asmptr++ = X25_DATA; 1097 } else { 1098 /* Build an Standard X.25 header */ 1099 asmptr = skb_push(skb, X25_STD_MIN_LEN); 1100 *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ; 1101 *asmptr++ = (x25->lci >> 0) & 0xFF; 1102 *asmptr++ = X25_DATA; 1103 } 1104 1105 if (qbit) 1106 skb->data[0] |= X25_Q_BIT; 1107 } 1108 1109 SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n"); 1110 SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n"); 1111 1112 rc = -ENOTCONN; 1113 if (sk->sk_state != TCP_ESTABLISHED) 1114 goto out_kfree_skb; 1115 1116 if (msg->msg_flags & MSG_OOB) 1117 skb_queue_tail(&x25->interrupt_out_queue, skb); 1118 else { 1119 len = x25_output(sk, skb); 1120 if (len < 0) 1121 kfree_skb(skb); 1122 else if (x25->qbitincl) 1123 len++; 1124 } 1125 1126 /* 1127 * lock_sock() is currently only used to serialize this x25_kick() 1128 * against input-driven x25_kick() calls. It currently only blocks 1129 * incoming packets for this socket and does not protect against 1130 * any other socket state changes and is not called from anywhere 1131 * else. As x25_kick() cannot block and as long as all socket 1132 * operations are BKL-wrapped, we don't need take to care about 1133 * purging the backlog queue in x25_release(). 1134 * 1135 * Using lock_sock() to protect all socket operations entirely 1136 * (and making the whole x25 stack SMP aware) unfortunately would 1137 * require major changes to {send,recv}msg and skb allocation methods. 1138 * -> 2.5 ;) 1139 */ 1140 lock_sock(sk); 1141 x25_kick(sk); 1142 release_sock(sk); 1143 rc = len; 1144out: 1145 return rc; 1146out_kfree_skb: 1147 kfree_skb(skb); 1148 goto out; 1149} 1150 1151 1152static int x25_recvmsg(struct kiocb *iocb, struct socket *sock, 1153 struct msghdr *msg, size_t size, 1154 int flags) 1155{ 1156 struct sock *sk = sock->sk; 1157 struct x25_sock *x25 = x25_sk(sk); 1158 struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name; 1159 size_t copied; 1160 int qbit; 1161 struct sk_buff *skb; 1162 unsigned char *asmptr; 1163 int rc = -ENOTCONN; 1164 1165 /* 1166 * This works for seqpacket too. The receiver has ordered the queue for 1167 * us! We do one quick check first though 1168 */ 1169 if (sk->sk_state != TCP_ESTABLISHED) 1170 goto out; 1171 1172 if (flags & MSG_OOB) { 1173 rc = -EINVAL; 1174 if (sock_flag(sk, SOCK_URGINLINE) || 1175 !skb_peek(&x25->interrupt_in_queue)) 1176 goto out; 1177 1178 skb = skb_dequeue(&x25->interrupt_in_queue); 1179 1180 skb_pull(skb, X25_STD_MIN_LEN); 1181 1182 /* 1183 * No Q bit information on Interrupt data. 1184 */ 1185 if (x25->qbitincl) { 1186 asmptr = skb_push(skb, 1); 1187 *asmptr = 0x00; 1188 } 1189 1190 msg->msg_flags |= MSG_OOB; 1191 } else { 1192 /* Now we can treat all alike */ 1193 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, 1194 flags & MSG_DONTWAIT, &rc); 1195 if (!skb) 1196 goto out; 1197 1198 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT; 1199 1200 skb_pull(skb, x25->neighbour->extended ? 1201 X25_EXT_MIN_LEN : X25_STD_MIN_LEN); 1202 1203 if (x25->qbitincl) { 1204 asmptr = skb_push(skb, 1); 1205 *asmptr = qbit; 1206 } 1207 } 1208 1209 skb_reset_transport_header(skb); 1210 copied = skb->len; 1211 1212 if (copied > size) { 1213 copied = size; 1214 msg->msg_flags |= MSG_TRUNC; 1215 } 1216 1217 /* Currently, each datagram always contains a complete record */ 1218 msg->msg_flags |= MSG_EOR; 1219 1220 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1221 if (rc) 1222 goto out_free_dgram; 1223 1224 if (sx25) { 1225 sx25->sx25_family = AF_X25; 1226 sx25->sx25_addr = x25->dest_addr; 1227 } 1228 1229 msg->msg_namelen = sizeof(struct sockaddr_x25); 1230 1231 lock_sock(sk); 1232 x25_check_rbuf(sk); 1233 release_sock(sk); 1234 rc = copied; 1235out_free_dgram: 1236 skb_free_datagram(sk, skb); 1237out: 1238 return rc; 1239} 1240 1241 1242static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1243{ 1244 struct sock *sk = sock->sk; 1245 struct x25_sock *x25 = x25_sk(sk); 1246 void __user *argp = (void __user *)arg; 1247 int rc; 1248 1249 switch (cmd) { 1250 case TIOCOUTQ: { 1251 int amount = sk->sk_sndbuf - 1252 atomic_read(&sk->sk_wmem_alloc); 1253 if (amount < 0) 1254 amount = 0; 1255 rc = put_user(amount, (unsigned int __user *)argp); 1256 break; 1257 } 1258 1259 case TIOCINQ: { 1260 struct sk_buff *skb; 1261 int amount = 0; 1262 /* 1263 * These two are safe on a single CPU system as 1264 * only user tasks fiddle here 1265 */ 1266 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1267 amount = skb->len; 1268 rc = put_user(amount, (unsigned int __user *)argp); 1269 break; 1270 } 1271 1272 case SIOCGSTAMP: 1273 rc = -EINVAL; 1274 if (sk) 1275 rc = sock_get_timestamp(sk, 1276 (struct timeval __user *)argp); 1277 break; 1278 case SIOCGSTAMPNS: 1279 rc = -EINVAL; 1280 if (sk) 1281 rc = sock_get_timestampns(sk, 1282 (struct timespec __user *)argp); 1283 break; 1284 case SIOCGIFADDR: 1285 case SIOCSIFADDR: 1286 case SIOCGIFDSTADDR: 1287 case SIOCSIFDSTADDR: 1288 case SIOCGIFBRDADDR: 1289 case SIOCSIFBRDADDR: 1290 case SIOCGIFNETMASK: 1291 case SIOCSIFNETMASK: 1292 case SIOCGIFMETRIC: 1293 case SIOCSIFMETRIC: 1294 rc = -EINVAL; 1295 break; 1296 case SIOCADDRT: 1297 case SIOCDELRT: 1298 rc = -EPERM; 1299 if (!capable(CAP_NET_ADMIN)) 1300 break; 1301 rc = x25_route_ioctl(cmd, argp); 1302 break; 1303 case SIOCX25GSUBSCRIP: 1304 rc = x25_subscr_ioctl(cmd, argp); 1305 break; 1306 case SIOCX25SSUBSCRIP: 1307 rc = -EPERM; 1308 if (!capable(CAP_NET_ADMIN)) 1309 break; 1310 rc = x25_subscr_ioctl(cmd, argp); 1311 break; 1312 case SIOCX25GFACILITIES: { 1313 struct x25_facilities fac = x25->facilities; 1314 rc = copy_to_user(argp, &fac, 1315 sizeof(fac)) ? -EFAULT : 0; 1316 break; 1317 } 1318 1319 case SIOCX25SFACILITIES: { 1320 struct x25_facilities facilities; 1321 rc = -EFAULT; 1322 if (copy_from_user(&facilities, argp, 1323 sizeof(facilities))) 1324 break; 1325 rc = -EINVAL; 1326 if (sk->sk_state != TCP_LISTEN && 1327 sk->sk_state != TCP_CLOSE) 1328 break; 1329 if (facilities.pacsize_in < X25_PS16 || 1330 facilities.pacsize_in > X25_PS4096) 1331 break; 1332 if (facilities.pacsize_out < X25_PS16 || 1333 facilities.pacsize_out > X25_PS4096) 1334 break; 1335 if (facilities.winsize_in < 1 || 1336 facilities.winsize_in > 127) 1337 break; 1338 if (facilities.throughput < 0x03 || 1339 facilities.throughput > 0xDD) 1340 break; 1341 if (facilities.reverse && 1342 (facilities.reverse | 0x81)!= 0x81) 1343 break; 1344 x25->facilities = facilities; 1345 rc = 0; 1346 break; 1347 } 1348 1349 case SIOCX25GDTEFACILITIES: { 1350 rc = copy_to_user(argp, &x25->dte_facilities, 1351 sizeof(x25->dte_facilities)); 1352 if (rc) 1353 rc = -EFAULT; 1354 break; 1355 } 1356 1357 case SIOCX25SDTEFACILITIES: { 1358 struct x25_dte_facilities dtefacs; 1359 rc = -EFAULT; 1360 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs))) 1361 break; 1362 rc = -EINVAL; 1363 if (sk->sk_state != TCP_LISTEN && 1364 sk->sk_state != TCP_CLOSE) 1365 break; 1366 if (dtefacs.calling_len > X25_MAX_AE_LEN) 1367 break; 1368 if (dtefacs.calling_ae == NULL) 1369 break; 1370 if (dtefacs.called_len > X25_MAX_AE_LEN) 1371 break; 1372 if (dtefacs.called_ae == NULL) 1373 break; 1374 x25->dte_facilities = dtefacs; 1375 rc = 0; 1376 break; 1377 } 1378 1379 case SIOCX25GCALLUSERDATA: { 1380 struct x25_calluserdata cud = x25->calluserdata; 1381 rc = copy_to_user(argp, &cud, 1382 sizeof(cud)) ? -EFAULT : 0; 1383 break; 1384 } 1385 1386 case SIOCX25SCALLUSERDATA: { 1387 struct x25_calluserdata calluserdata; 1388 1389 rc = -EFAULT; 1390 if (copy_from_user(&calluserdata, argp, 1391 sizeof(calluserdata))) 1392 break; 1393 rc = -EINVAL; 1394 if (calluserdata.cudlength > X25_MAX_CUD_LEN) 1395 break; 1396 x25->calluserdata = calluserdata; 1397 rc = 0; 1398 break; 1399 } 1400 1401 case SIOCX25GCAUSEDIAG: { 1402 struct x25_causediag causediag; 1403 causediag = x25->causediag; 1404 rc = copy_to_user(argp, &causediag, 1405 sizeof(causediag)) ? -EFAULT : 0; 1406 break; 1407 } 1408 1409 case SIOCX25SCUDMATCHLEN: { 1410 struct x25_subaddr sub_addr; 1411 rc = -EINVAL; 1412 if(sk->sk_state != TCP_CLOSE) 1413 break; 1414 rc = -EFAULT; 1415 if (copy_from_user(&sub_addr, argp, 1416 sizeof(sub_addr))) 1417 break; 1418 rc = -EINVAL; 1419 if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN) 1420 break; 1421 x25->cudmatchlength = sub_addr.cudmatchlength; 1422 rc = 0; 1423 break; 1424 } 1425 1426 case SIOCX25CALLACCPTAPPRV: { 1427 rc = -EINVAL; 1428 if (sk->sk_state != TCP_CLOSE) 1429 break; 1430 x25->accptapprv = X25_ALLOW_ACCPT_APPRV; 1431 rc = 0; 1432 break; 1433 } 1434 1435 case SIOCX25SENDCALLACCPT: { 1436 rc = -EINVAL; 1437 if (sk->sk_state != TCP_ESTABLISHED) 1438 break; 1439 if (x25->accptapprv) /* must call accptapprv above */ 1440 break; 1441 x25_write_internal(sk, X25_CALL_ACCEPTED); 1442 x25->state = X25_STATE_3; 1443 rc = 0; 1444 break; 1445 } 1446 1447 default: 1448 rc = -ENOIOCTLCMD; 1449 break; 1450 } 1451 1452 return rc; 1453} 1454 1455static struct net_proto_family x25_family_ops = { 1456 .family = AF_X25, 1457 .create = x25_create, 1458 .owner = THIS_MODULE, 1459}; 1460 1461#ifdef CONFIG_COMPAT 1462static int compat_x25_subscr_ioctl(unsigned int cmd, 1463 struct compat_x25_subscrip_struct __user *x25_subscr32) 1464{ 1465 struct compat_x25_subscrip_struct x25_subscr; 1466 struct x25_neigh *nb; 1467 struct net_device *dev; 1468 int rc = -EINVAL; 1469 1470 rc = -EFAULT; 1471 if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32))) 1472 goto out; 1473 1474 rc = -EINVAL; 1475 dev = x25_dev_get(x25_subscr.device); 1476 if (dev == NULL) 1477 goto out; 1478 1479 nb = x25_get_neigh(dev); 1480 if (nb == NULL) 1481 goto out_dev_put; 1482 1483 dev_put(dev); 1484 1485 if (cmd == SIOCX25GSUBSCRIP) { 1486 x25_subscr.extended = nb->extended; 1487 x25_subscr.global_facil_mask = nb->global_facil_mask; 1488 rc = copy_to_user(x25_subscr32, &x25_subscr, 1489 sizeof(*x25_subscr32)) ? -EFAULT : 0; 1490 } else { 1491 rc = -EINVAL; 1492 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) { 1493 rc = 0; 1494 nb->extended = x25_subscr.extended; 1495 nb->global_facil_mask = x25_subscr.global_facil_mask; 1496 } 1497 } 1498 x25_neigh_put(nb); 1499out: 1500 return rc; 1501out_dev_put: 1502 dev_put(dev); 1503 goto out; 1504} 1505 1506static int compat_x25_ioctl(struct socket *sock, unsigned int cmd, 1507 unsigned long arg) 1508{ 1509 void __user *argp = compat_ptr(arg); 1510 struct sock *sk = sock->sk; 1511 1512 int rc = -ENOIOCTLCMD; 1513 1514 switch(cmd) { 1515 case TIOCOUTQ: 1516 case TIOCINQ: 1517 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1518 break; 1519 case SIOCGSTAMP: 1520 rc = -EINVAL; 1521 if (sk) 1522 rc = compat_sock_get_timestamp(sk, 1523 (struct timeval __user*)argp); 1524 break; 1525 case SIOCGSTAMPNS: 1526 rc = -EINVAL; 1527 if (sk) 1528 rc = compat_sock_get_timestampns(sk, 1529 (struct timespec __user*)argp); 1530 break; 1531 case SIOCGIFADDR: 1532 case SIOCSIFADDR: 1533 case SIOCGIFDSTADDR: 1534 case SIOCSIFDSTADDR: 1535 case SIOCGIFBRDADDR: 1536 case SIOCSIFBRDADDR: 1537 case SIOCGIFNETMASK: 1538 case SIOCSIFNETMASK: 1539 case SIOCGIFMETRIC: 1540 case SIOCSIFMETRIC: 1541 rc = -EINVAL; 1542 break; 1543 case SIOCADDRT: 1544 case SIOCDELRT: 1545 rc = -EPERM; 1546 if (!capable(CAP_NET_ADMIN)) 1547 break; 1548 rc = x25_route_ioctl(cmd, argp); 1549 break; 1550 case SIOCX25GSUBSCRIP: 1551 rc = compat_x25_subscr_ioctl(cmd, argp); 1552 break; 1553 case SIOCX25SSUBSCRIP: 1554 rc = -EPERM; 1555 if (!capable(CAP_NET_ADMIN)) 1556 break; 1557 rc = compat_x25_subscr_ioctl(cmd, argp); 1558 break; 1559 case SIOCX25GFACILITIES: 1560 case SIOCX25SFACILITIES: 1561 case SIOCX25GDTEFACILITIES: 1562 case SIOCX25SDTEFACILITIES: 1563 case SIOCX25GCALLUSERDATA: 1564 case SIOCX25SCALLUSERDATA: 1565 case SIOCX25GCAUSEDIAG: 1566 case SIOCX25SCUDMATCHLEN: 1567 case SIOCX25CALLACCPTAPPRV: 1568 case SIOCX25SENDCALLACCPT: 1569 rc = x25_ioctl(sock, cmd, (unsigned long)argp); 1570 break; 1571 default: 1572 rc = -ENOIOCTLCMD; 1573 break; 1574 } 1575 return rc; 1576} 1577#endif 1578 1579static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = { 1580 .family = AF_X25, 1581 .owner = THIS_MODULE, 1582 .release = x25_release, 1583 .bind = x25_bind, 1584 .connect = x25_connect, 1585 .socketpair = sock_no_socketpair, 1586 .accept = x25_accept, 1587 .getname = x25_getname, 1588 .poll = datagram_poll, 1589 .ioctl = x25_ioctl, 1590#ifdef CONFIG_COMPAT 1591 .compat_ioctl = compat_x25_ioctl, 1592#endif 1593 .listen = x25_listen, 1594 .shutdown = sock_no_shutdown, 1595 .setsockopt = x25_setsockopt, 1596 .getsockopt = x25_getsockopt, 1597 .sendmsg = x25_sendmsg, 1598 .recvmsg = x25_recvmsg, 1599 .mmap = sock_no_mmap, 1600 .sendpage = sock_no_sendpage, 1601}; 1602 1603SOCKOPS_WRAP(x25_proto, AF_X25); 1604 1605static struct packet_type x25_packet_type = { 1606 .type = __constant_htons(ETH_P_X25), 1607 .func = x25_lapb_receive_frame, 1608}; 1609 1610static struct notifier_block x25_dev_notifier = { 1611 .notifier_call = x25_device_event, 1612}; 1613 1614void x25_kill_by_neigh(struct x25_neigh *nb) 1615{ 1616 struct sock *s; 1617 struct hlist_node *node; 1618 1619 write_lock_bh(&x25_list_lock); 1620 1621 sk_for_each(s, node, &x25_list) 1622 if (x25_sk(s)->neighbour == nb) 1623 x25_disconnect(s, ENETUNREACH, 0, 0); 1624 1625 write_unlock_bh(&x25_list_lock); 1626 1627 /* Remove any related forwards */ 1628 x25_clear_forward_by_dev(nb->dev); 1629} 1630 1631static int __init x25_init(void) 1632{ 1633 int rc = proto_register(&x25_proto, 0); 1634 1635 if (rc != 0) 1636 goto out; 1637 1638 sock_register(&x25_family_ops); 1639 1640 dev_add_pack(&x25_packet_type); 1641 1642 register_netdevice_notifier(&x25_dev_notifier); 1643 1644 printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n"); 1645 1646#ifdef CONFIG_SYSCTL 1647 x25_register_sysctl(); 1648#endif 1649 x25_proc_init(); 1650out: 1651 return rc; 1652} 1653module_init(x25_init); 1654 1655static void __exit x25_exit(void) 1656{ 1657 x25_proc_exit(); 1658 x25_link_free(); 1659 x25_route_free(); 1660 1661#ifdef CONFIG_SYSCTL 1662 x25_unregister_sysctl(); 1663#endif 1664 1665 unregister_netdevice_notifier(&x25_dev_notifier); 1666 1667 dev_remove_pack(&x25_packet_type); 1668 1669 sock_unregister(AF_X25); 1670 proto_unregister(&x25_proto); 1671} 1672module_exit(x25_exit); 1673 1674MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); 1675MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol"); 1676MODULE_LICENSE("GPL"); 1677MODULE_ALIAS_NETPROTO(PF_X25); 1678