1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 8 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) 9 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk) 10 */ 11 #include <linux/config.h> 12 #include <linux/module.h> 13 #include <linux/moduleparam.h> 14 #include <linux/capability.h> 15 #include <linux/errno.h> 16 #include <linux/types.h> 17 #include <linux/socket.h> 18 #include <linux/in.h> 19 #include <linux/kernel.h> 20 #include <linux/sched.h> 21 #include <linux/timer.h> 22 #include <linux/string.h> 23 #include <linux/sockios.h> 24 #include <linux/net.h> 25 #include <linux/stat.h> 26 #include <net/ax25.h> 27 #include <linux/inet.h> 28 #include <linux/netdevice.h> 29 #include <linux/if_arp.h> 30 #include <linux/skbuff.h> 31 #include <net/sock.h> 32 #include <asm/uaccess.h> 33 #include <asm/system.h> 34 #include <linux/fcntl.h> 35 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 36 #include <linux/mm.h> 37 #include <linux/interrupt.h> 38 #include <linux/notifier.h> 39 #include <net/netrom.h> 40 #include <linux/proc_fs.h> 41 #include <linux/seq_file.h> 42 #include <net/ip.h> 43 #include <net/tcp_states.h> 44 #include <net/arp.h> 45 #include <linux/init.h> 46 47 static int nr_ndevs = 4; 48 49 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL; 50 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS; 51 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL; 52 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1; 53 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2; 54 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2; 55 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4; 56 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW; 57 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE; 58 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING; 59 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS; 60 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET; 61 62 static unsigned short circuit = 0x101; 63 64 static HLIST_HEAD(nr_list); 65 static DEFINE_SPINLOCK(nr_list_lock); 66 67 static const struct proto_ops nr_proto_ops; 68 69 /* 70 * Socket removal during an interrupt is now safe. 71 */ 72 static void nr_remove_socket(struct sock *sk) 73 { 74 spin_lock_bh(&nr_list_lock); 75 sk_del_node_init(sk); 76 spin_unlock_bh(&nr_list_lock); 77 } 78 79 /* 80 * Kill all bound sockets on a dropped device. 81 */ 82 static void nr_kill_by_device(struct net_device *dev) 83 { 84 struct sock *s; 85 struct hlist_node *node; 86 87 spin_lock_bh(&nr_list_lock); 88 sk_for_each(s, node, &nr_list) 89 if (nr_sk(s)->device == dev) 90 nr_disconnect(s, ENETUNREACH); 91 spin_unlock_bh(&nr_list_lock); 92 } 93 94 /* 95 * Handle device status changes. 96 */ 97 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) 98 { 99 struct net_device *dev = (struct net_device *)ptr; 100 101 if (event != NETDEV_DOWN) 102 return NOTIFY_DONE; 103 104 nr_kill_by_device(dev); 105 nr_rt_device_down(dev); 106 107 return NOTIFY_DONE; 108 } 109 110 /* 111 * Add a socket to the bound sockets list. 112 */ 113 static void nr_insert_socket(struct sock *sk) 114 { 115 spin_lock_bh(&nr_list_lock); 116 sk_add_node(sk, &nr_list); 117 spin_unlock_bh(&nr_list_lock); 118 } 119 120 /* 121 * Find a socket that wants to accept the Connect Request we just 122 * received. 123 */ 124 static struct sock *nr_find_listener(ax25_address *addr) 125 { 126 struct sock *s; 127 struct hlist_node *node; 128 129 spin_lock_bh(&nr_list_lock); 130 sk_for_each(s, node, &nr_list) 131 if (!ax25cmp(&nr_sk(s)->source_addr, addr) && 132 s->sk_state == TCP_LISTEN) { 133 bh_lock_sock(s); 134 goto found; 135 } 136 s = NULL; 137 found: 138 spin_unlock_bh(&nr_list_lock); 139 return s; 140 } 141 142 /* 143 * Find a connected NET/ROM socket given my circuit IDs. 144 */ 145 static struct sock *nr_find_socket(unsigned char index, unsigned char id) 146 { 147 struct sock *s; 148 struct hlist_node *node; 149 150 spin_lock_bh(&nr_list_lock); 151 sk_for_each(s, node, &nr_list) { 152 struct nr_sock *nr = nr_sk(s); 153 154 if (nr->my_index == index && nr->my_id == id) { 155 bh_lock_sock(s); 156 goto found; 157 } 158 } 159 s = NULL; 160 found: 161 spin_unlock_bh(&nr_list_lock); 162 return s; 163 } 164 165 /* 166 * Find a connected NET/ROM socket given their circuit IDs. 167 */ 168 static struct sock *nr_find_peer(unsigned char index, unsigned char id, 169 ax25_address *dest) 170 { 171 struct sock *s; 172 struct hlist_node *node; 173 174 spin_lock_bh(&nr_list_lock); 175 sk_for_each(s, node, &nr_list) { 176 struct nr_sock *nr = nr_sk(s); 177 178 if (nr->your_index == index && nr->your_id == id && 179 !ax25cmp(&nr->dest_addr, dest)) { 180 bh_lock_sock(s); 181 goto found; 182 } 183 } 184 s = NULL; 185 found: 186 spin_unlock_bh(&nr_list_lock); 187 return s; 188 } 189 190 /* 191 * Find next free circuit ID. 192 */ 193 static unsigned short nr_find_next_circuit(void) 194 { 195 unsigned short id = circuit; 196 unsigned char i, j; 197 struct sock *sk; 198 199 for (;;) { 200 i = id / 256; 201 j = id % 256; 202 203 if (i != 0 && j != 0) { 204 if ((sk=nr_find_socket(i, j)) == NULL) 205 break; 206 bh_unlock_sock(sk); 207 } 208 209 id++; 210 } 211 212 return id; 213 } 214 215 /* 216 * Deferred destroy. 217 */ 218 void nr_destroy_socket(struct sock *); 219 220 /* 221 * Handler for deferred kills. 222 */ 223 static void nr_destroy_timer(unsigned long data) 224 { 225 struct sock *sk=(struct sock *)data; 226 bh_lock_sock(sk); 227 sock_hold(sk); 228 nr_destroy_socket(sk); 229 bh_unlock_sock(sk); 230 sock_put(sk); 231 } 232 233 /* 234 * This is called from user mode and the timers. Thus it protects itself 235 * against interrupt users but doesn't worry about being called during 236 * work. Once it is removed from the queue no interrupt or bottom half 237 * will touch it and we are (fairly 8-) ) safe. 238 */ 239 void nr_destroy_socket(struct sock *sk) 240 { 241 struct sk_buff *skb; 242 243 nr_remove_socket(sk); 244 245 nr_stop_heartbeat(sk); 246 nr_stop_t1timer(sk); 247 nr_stop_t2timer(sk); 248 nr_stop_t4timer(sk); 249 nr_stop_idletimer(sk); 250 251 nr_clear_queues(sk); /* Flush the queues */ 252 253 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 254 if (skb->sk != sk) { /* A pending connection */ 255 /* Queue the unaccepted socket for death */ 256 sock_set_flag(skb->sk, SOCK_DEAD); 257 nr_start_heartbeat(skb->sk); 258 nr_sk(skb->sk)->state = NR_STATE_0; 259 } 260 261 kfree_skb(skb); 262 } 263 264 if (atomic_read(&sk->sk_wmem_alloc) || 265 atomic_read(&sk->sk_rmem_alloc)) { 266 /* Defer: outstanding buffers */ 267 sk->sk_timer.function = nr_destroy_timer; 268 sk->sk_timer.expires = jiffies + 2 * HZ; 269 add_timer(&sk->sk_timer); 270 } else 271 sock_put(sk); 272 } 273 274 /* 275 * Handling for system calls applied via the various interfaces to a 276 * NET/ROM socket object. 277 */ 278 279 static int nr_setsockopt(struct socket *sock, int level, int optname, 280 char __user *optval, int optlen) 281 { 282 struct sock *sk = sock->sk; 283 struct nr_sock *nr = nr_sk(sk); 284 int opt; 285 286 if (level != SOL_NETROM) 287 return -ENOPROTOOPT; 288 289 if (optlen < sizeof(int)) 290 return -EINVAL; 291 292 if (get_user(opt, (int __user *)optval)) 293 return -EFAULT; 294 295 switch (optname) { 296 case NETROM_T1: 297 if (opt < 1) 298 return -EINVAL; 299 nr->t1 = opt * HZ; 300 return 0; 301 302 case NETROM_T2: 303 if (opt < 1) 304 return -EINVAL; 305 nr->t2 = opt * HZ; 306 return 0; 307 308 case NETROM_N2: 309 if (opt < 1 || opt > 31) 310 return -EINVAL; 311 nr->n2 = opt; 312 return 0; 313 314 case NETROM_T4: 315 if (opt < 1) 316 return -EINVAL; 317 nr->t4 = opt * HZ; 318 return 0; 319 320 case NETROM_IDLE: 321 if (opt < 0) 322 return -EINVAL; 323 nr->idle = opt * 60 * HZ; 324 return 0; 325 326 default: 327 return -ENOPROTOOPT; 328 } 329 } 330 331 static int nr_getsockopt(struct socket *sock, int level, int optname, 332 char __user *optval, int __user *optlen) 333 { 334 struct sock *sk = sock->sk; 335 struct nr_sock *nr = nr_sk(sk); 336 int val = 0; 337 int len; 338 339 if (level != SOL_NETROM) 340 return -ENOPROTOOPT; 341 342 if (get_user(len, optlen)) 343 return -EFAULT; 344 345 if (len < 0) 346 return -EINVAL; 347 348 switch (optname) { 349 case NETROM_T1: 350 val = nr->t1 / HZ; 351 break; 352 353 case NETROM_T2: 354 val = nr->t2 / HZ; 355 break; 356 357 case NETROM_N2: 358 val = nr->n2; 359 break; 360 361 case NETROM_T4: 362 val = nr->t4 / HZ; 363 break; 364 365 case NETROM_IDLE: 366 val = nr->idle / (60 * HZ); 367 break; 368 369 default: 370 return -ENOPROTOOPT; 371 } 372 373 len = min_t(unsigned int, len, sizeof(int)); 374 375 if (put_user(len, optlen)) 376 return -EFAULT; 377 378 return copy_to_user(optval, &val, len) ? -EFAULT : 0; 379 } 380 381 static int nr_listen(struct socket *sock, int backlog) 382 { 383 struct sock *sk = sock->sk; 384 385 lock_sock(sk); 386 if (sk->sk_state != TCP_LISTEN) { 387 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); 388 sk->sk_max_ack_backlog = backlog; 389 sk->sk_state = TCP_LISTEN; 390 release_sock(sk); 391 return 0; 392 } 393 release_sock(sk); 394 395 return -EOPNOTSUPP; 396 } 397 398 static struct proto nr_proto = { 399 .name = "NETROM", 400 .owner = THIS_MODULE, 401 .obj_size = sizeof(struct nr_sock), 402 }; 403 404 static int nr_create(struct socket *sock, int protocol) 405 { 406 struct sock *sk; 407 struct nr_sock *nr; 408 409 if (sock->type != SOCK_SEQPACKET || protocol != 0) 410 return -ESOCKTNOSUPPORT; 411 412 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, &nr_proto, 1)) == NULL) 413 return -ENOMEM; 414 415 nr = nr_sk(sk); 416 417 sock_init_data(sock, sk); 418 419 sock->ops = &nr_proto_ops; 420 sk->sk_protocol = protocol; 421 422 skb_queue_head_init(&nr->ack_queue); 423 skb_queue_head_init(&nr->reseq_queue); 424 skb_queue_head_init(&nr->frag_queue); 425 426 nr_init_timers(sk); 427 428 nr->t1 = 429 msecs_to_jiffies(sysctl_netrom_transport_timeout); 430 nr->t2 = 431 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); 432 nr->n2 = 433 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); 434 nr->t4 = 435 msecs_to_jiffies(sysctl_netrom_transport_busy_delay); 436 nr->idle = 437 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); 438 nr->window = sysctl_netrom_transport_requested_window_size; 439 440 nr->bpqext = 1; 441 nr->state = NR_STATE_0; 442 443 return 0; 444 } 445 446 static struct sock *nr_make_new(struct sock *osk) 447 { 448 struct sock *sk; 449 struct nr_sock *nr, *onr; 450 451 if (osk->sk_type != SOCK_SEQPACKET) 452 return NULL; 453 454 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, osk->sk_prot, 1)) == NULL) 455 return NULL; 456 457 nr = nr_sk(sk); 458 459 sock_init_data(NULL, sk); 460 461 sk->sk_type = osk->sk_type; 462 sk->sk_socket = osk->sk_socket; 463 sk->sk_priority = osk->sk_priority; 464 sk->sk_protocol = osk->sk_protocol; 465 sk->sk_rcvbuf = osk->sk_rcvbuf; 466 sk->sk_sndbuf = osk->sk_sndbuf; 467 sk->sk_state = TCP_ESTABLISHED; 468 sk->sk_sleep = osk->sk_sleep; 469 sock_copy_flags(sk, osk); 470 471 skb_queue_head_init(&nr->ack_queue); 472 skb_queue_head_init(&nr->reseq_queue); 473 skb_queue_head_init(&nr->frag_queue); 474 475 nr_init_timers(sk); 476 477 onr = nr_sk(osk); 478 479 nr->t1 = onr->t1; 480 nr->t2 = onr->t2; 481 nr->n2 = onr->n2; 482 nr->t4 = onr->t4; 483 nr->idle = onr->idle; 484 nr->window = onr->window; 485 486 nr->device = onr->device; 487 nr->bpqext = onr->bpqext; 488 489 return sk; 490 } 491 492 static int nr_release(struct socket *sock) 493 { 494 struct sock *sk = sock->sk; 495 struct nr_sock *nr; 496 497 if (sk == NULL) return 0; 498 499 sock_hold(sk); 500 lock_sock(sk); 501 nr = nr_sk(sk); 502 503 switch (nr->state) { 504 case NR_STATE_0: 505 case NR_STATE_1: 506 case NR_STATE_2: 507 nr_disconnect(sk, 0); 508 nr_destroy_socket(sk); 509 break; 510 511 case NR_STATE_3: 512 nr_clear_queues(sk); 513 nr->n2count = 0; 514 nr_write_internal(sk, NR_DISCREQ); 515 nr_start_t1timer(sk); 516 nr_stop_t2timer(sk); 517 nr_stop_t4timer(sk); 518 nr_stop_idletimer(sk); 519 nr->state = NR_STATE_2; 520 sk->sk_state = TCP_CLOSE; 521 sk->sk_shutdown |= SEND_SHUTDOWN; 522 sk->sk_state_change(sk); 523 sock_orphan(sk); 524 sock_set_flag(sk, SOCK_DESTROY); 525 sk->sk_socket = NULL; 526 break; 527 528 default: 529 sk->sk_socket = NULL; 530 break; 531 } 532 533 sock->sk = NULL; 534 release_sock(sk); 535 sock_put(sk); 536 537 return 0; 538 } 539 540 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 541 { 542 struct sock *sk = sock->sk; 543 struct nr_sock *nr = nr_sk(sk); 544 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 545 struct net_device *dev; 546 ax25_uid_assoc *user; 547 ax25_address *source; 548 549 lock_sock(sk); 550 if (!sock_flag(sk, SOCK_ZAPPED)) { 551 release_sock(sk); 552 return -EINVAL; 553 } 554 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { 555 release_sock(sk); 556 return -EINVAL; 557 } 558 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { 559 release_sock(sk); 560 return -EINVAL; 561 } 562 if (addr->fsa_ax25.sax25_family != AF_NETROM) { 563 release_sock(sk); 564 return -EINVAL; 565 } 566 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { 567 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); 568 release_sock(sk); 569 return -EADDRNOTAVAIL; 570 } 571 572 /* 573 * Only the super user can set an arbitrary user callsign. 574 */ 575 if (addr->fsa_ax25.sax25_ndigis == 1) { 576 if (!capable(CAP_NET_BIND_SERVICE)) { 577 dev_put(dev); 578 release_sock(sk); 579 return -EACCES; 580 } 581 nr->user_addr = addr->fsa_digipeater[0]; 582 nr->source_addr = addr->fsa_ax25.sax25_call; 583 } else { 584 source = &addr->fsa_ax25.sax25_call; 585 586 user = ax25_findbyuid(current->euid); 587 if (user) { 588 nr->user_addr = user->call; 589 ax25_uid_put(user); 590 } else { 591 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { 592 release_sock(sk); 593 dev_put(dev); 594 return -EPERM; 595 } 596 nr->user_addr = *source; 597 } 598 599 nr->source_addr = *source; 600 } 601 602 nr->device = dev; 603 nr_insert_socket(sk); 604 605 sock_reset_flag(sk, SOCK_ZAPPED); 606 dev_put(dev); 607 release_sock(sk); 608 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); 609 return 0; 610 } 611 612 static int nr_connect(struct socket *sock, struct sockaddr *uaddr, 613 int addr_len, int flags) 614 { 615 struct sock *sk = sock->sk; 616 struct nr_sock *nr = nr_sk(sk); 617 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; 618 ax25_address *source = NULL; 619 ax25_uid_assoc *user; 620 struct net_device *dev; 621 622 lock_sock(sk); 623 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 624 sock->state = SS_CONNECTED; 625 release_sock(sk); 626 return 0; /* Connect completed during a ERESTARTSYS event */ 627 } 628 629 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 630 sock->state = SS_UNCONNECTED; 631 release_sock(sk); 632 return -ECONNREFUSED; 633 } 634 635 if (sk->sk_state == TCP_ESTABLISHED) { 636 release_sock(sk); 637 return -EISCONN; /* No reconnect on a seqpacket socket */ 638 } 639 640 sk->sk_state = TCP_CLOSE; 641 sock->state = SS_UNCONNECTED; 642 643 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { 644 release_sock(sk); 645 return -EINVAL; 646 } 647 if (addr->sax25_family != AF_NETROM) { 648 release_sock(sk); 649 return -EINVAL; 650 } 651 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ 652 sock_reset_flag(sk, SOCK_ZAPPED); 653 654 if ((dev = nr_dev_first()) == NULL) { 655 release_sock(sk); 656 return -ENETUNREACH; 657 } 658 source = (ax25_address *)dev->dev_addr; 659 660 user = ax25_findbyuid(current->euid); 661 if (user) { 662 nr->user_addr = user->call; 663 ax25_uid_put(user); 664 } else { 665 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { 666 dev_put(dev); 667 release_sock(sk); 668 return -EPERM; 669 } 670 nr->user_addr = *source; 671 } 672 673 nr->source_addr = *source; 674 nr->device = dev; 675 676 dev_put(dev); 677 nr_insert_socket(sk); /* Finish the bind */ 678 } 679 680 nr->dest_addr = addr->sax25_call; 681 682 release_sock(sk); 683 circuit = nr_find_next_circuit(); 684 lock_sock(sk); 685 686 nr->my_index = circuit / 256; 687 nr->my_id = circuit % 256; 688 689 circuit++; 690 691 /* Move to connecting socket, start sending Connect Requests */ 692 sock->state = SS_CONNECTING; 693 sk->sk_state = TCP_SYN_SENT; 694 695 nr_establish_data_link(sk); 696 697 nr->state = NR_STATE_1; 698 699 nr_start_heartbeat(sk); 700 701 /* Now the loop */ 702 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 703 release_sock(sk); 704 return -EINPROGRESS; 705 } 706 707 /* 708 * A Connect Ack with Choke or timeout or failed routing will go to 709 * closed. 710 */ 711 if (sk->sk_state == TCP_SYN_SENT) { 712 struct task_struct *tsk = current; 713 DECLARE_WAITQUEUE(wait, tsk); 714 715 add_wait_queue(sk->sk_sleep, &wait); 716 for (;;) { 717 set_current_state(TASK_INTERRUPTIBLE); 718 if (sk->sk_state != TCP_SYN_SENT) 719 break; 720 release_sock(sk); 721 if (!signal_pending(tsk)) { 722 schedule(); 723 lock_sock(sk); 724 continue; 725 } 726 current->state = TASK_RUNNING; 727 remove_wait_queue(sk->sk_sleep, &wait); 728 return -ERESTARTSYS; 729 } 730 current->state = TASK_RUNNING; 731 remove_wait_queue(sk->sk_sleep, &wait); 732 } 733 734 if (sk->sk_state != TCP_ESTABLISHED) { 735 sock->state = SS_UNCONNECTED; 736 release_sock(sk); 737 return sock_error(sk); /* Always set at this point */ 738 } 739 740 sock->state = SS_CONNECTED; 741 release_sock(sk); 742 743 return 0; 744 } 745 746 static int nr_accept(struct socket *sock, struct socket *newsock, int flags) 747 { 748 struct task_struct *tsk = current; 749 DECLARE_WAITQUEUE(wait, tsk); 750 struct sk_buff *skb; 751 struct sock *newsk; 752 struct sock *sk; 753 int err = 0; 754 755 if ((sk = sock->sk) == NULL) 756 return -EINVAL; 757 758 lock_sock(sk); 759 if (sk->sk_type != SOCK_SEQPACKET) { 760 err = -EOPNOTSUPP; 761 goto out; 762 } 763 764 if (sk->sk_state != TCP_LISTEN) { 765 err = -EINVAL; 766 goto out; 767 } 768 769 /* 770 * The write queue this time is holding sockets ready to use 771 * hooked into the SABM we saved 772 */ 773 add_wait_queue(sk->sk_sleep, &wait); 774 for (;;) { 775 skb = skb_dequeue(&sk->sk_receive_queue); 776 if (skb) 777 break; 778 779 current->state = TASK_INTERRUPTIBLE; 780 release_sock(sk); 781 if (flags & O_NONBLOCK) { 782 current->state = TASK_RUNNING; 783 remove_wait_queue(sk->sk_sleep, &wait); 784 return -EWOULDBLOCK; 785 } 786 if (!signal_pending(tsk)) { 787 schedule(); 788 lock_sock(sk); 789 continue; 790 } 791 current->state = TASK_RUNNING; 792 remove_wait_queue(sk->sk_sleep, &wait); 793 return -ERESTARTSYS; 794 } 795 current->state = TASK_RUNNING; 796 remove_wait_queue(sk->sk_sleep, &wait); 797 798 newsk = skb->sk; 799 newsk->sk_socket = newsock; 800 newsk->sk_sleep = &newsock->wait; 801 802 /* Now attach up the new socket */ 803 kfree_skb(skb); 804 sk->sk_ack_backlog--; 805 newsock->sk = newsk; 806 807 out: 808 release_sock(sk); 809 return err; 810 } 811 812 static int nr_getname(struct socket *sock, struct sockaddr *uaddr, 813 int *uaddr_len, int peer) 814 { 815 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; 816 struct sock *sk = sock->sk; 817 struct nr_sock *nr = nr_sk(sk); 818 819 lock_sock(sk); 820 if (peer != 0) { 821 if (sk->sk_state != TCP_ESTABLISHED) { 822 release_sock(sk); 823 return -ENOTCONN; 824 } 825 sax->fsa_ax25.sax25_family = AF_NETROM; 826 sax->fsa_ax25.sax25_ndigis = 1; 827 sax->fsa_ax25.sax25_call = nr->user_addr; 828 sax->fsa_digipeater[0] = nr->dest_addr; 829 *uaddr_len = sizeof(struct full_sockaddr_ax25); 830 } else { 831 sax->fsa_ax25.sax25_family = AF_NETROM; 832 sax->fsa_ax25.sax25_ndigis = 0; 833 sax->fsa_ax25.sax25_call = nr->source_addr; 834 *uaddr_len = sizeof(struct sockaddr_ax25); 835 } 836 release_sock(sk); 837 838 return 0; 839 } 840 841 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) 842 { 843 struct sock *sk; 844 struct sock *make; 845 struct nr_sock *nr_make; 846 ax25_address *src, *dest, *user; 847 unsigned short circuit_index, circuit_id; 848 unsigned short peer_circuit_index, peer_circuit_id; 849 unsigned short frametype, flags, window, timeout; 850 int ret; 851 852 skb->sk = NULL; /* Initially we don't know who it's for */ 853 854 /* 855 * skb->data points to the netrom frame start 856 */ 857 858 src = (ax25_address *)(skb->data + 0); 859 dest = (ax25_address *)(skb->data + 7); 860 861 circuit_index = skb->data[15]; 862 circuit_id = skb->data[16]; 863 peer_circuit_index = skb->data[17]; 864 peer_circuit_id = skb->data[18]; 865 frametype = skb->data[19] & 0x0F; 866 flags = skb->data[19] & 0xF0; 867 868 /* 869 * Check for an incoming IP over NET/ROM frame. 870 */ 871 if (frametype == NR_PROTOEXT && 872 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { 873 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); 874 skb->h.raw = skb->data; 875 876 return nr_rx_ip(skb, dev); 877 } 878 879 /* 880 * Find an existing socket connection, based on circuit ID, if it's 881 * a Connect Request base it on their circuit ID. 882 * 883 * Circuit ID 0/0 is not valid but it could still be a "reset" for a 884 * circuit that no longer exists at the other end ... 885 */ 886 887 sk = NULL; 888 889 if (circuit_index == 0 && circuit_id == 0) { 890 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) 891 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); 892 } else { 893 if (frametype == NR_CONNREQ) 894 sk = nr_find_peer(circuit_index, circuit_id, src); 895 else 896 sk = nr_find_socket(circuit_index, circuit_id); 897 } 898 899 if (sk != NULL) { 900 skb->h.raw = skb->data; 901 902 if (frametype == NR_CONNACK && skb->len == 22) 903 nr_sk(sk)->bpqext = 1; 904 else 905 nr_sk(sk)->bpqext = 0; 906 907 ret = nr_process_rx_frame(sk, skb); 908 bh_unlock_sock(sk); 909 return ret; 910 } 911 912 /* 913 * Now it should be a CONNREQ. 914 */ 915 if (frametype != NR_CONNREQ) { 916 /* 917 * Here it would be nice to be able to send a reset but 918 * NET/ROM doesn't have one. We've tried to extend the protocol 919 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that 920 * apparently kills BPQ boxes... :-( 921 * So now we try to follow the established behaviour of 922 * G8PZT's Xrouter which is sending packets with command type 7 923 * as an extension of the protocol. 924 */ 925 if (sysctl_netrom_reset_circuit && 926 (frametype != NR_RESET || flags != 0)) 927 nr_transmit_reset(skb, 1); 928 929 return 0; 930 } 931 932 sk = nr_find_listener(dest); 933 934 user = (ax25_address *)(skb->data + 21); 935 936 if (sk == NULL || sk_acceptq_is_full(sk) || 937 (make = nr_make_new(sk)) == NULL) { 938 nr_transmit_refusal(skb, 0); 939 if (sk) 940 bh_unlock_sock(sk); 941 return 0; 942 } 943 944 window = skb->data[20]; 945 946 skb->sk = make; 947 make->sk_state = TCP_ESTABLISHED; 948 949 /* Fill in his circuit details */ 950 nr_make = nr_sk(make); 951 nr_make->source_addr = *dest; 952 nr_make->dest_addr = *src; 953 nr_make->user_addr = *user; 954 955 nr_make->your_index = circuit_index; 956 nr_make->your_id = circuit_id; 957 958 bh_unlock_sock(sk); 959 circuit = nr_find_next_circuit(); 960 bh_lock_sock(sk); 961 962 nr_make->my_index = circuit / 256; 963 nr_make->my_id = circuit % 256; 964 965 circuit++; 966 967 /* Window negotiation */ 968 if (window < nr_make->window) 969 nr_make->window = window; 970 971 /* L4 timeout negotiation */ 972 if (skb->len == 37) { 973 timeout = skb->data[36] * 256 + skb->data[35]; 974 if (timeout * HZ < nr_make->t1) 975 nr_make->t1 = timeout * HZ; 976 nr_make->bpqext = 1; 977 } else { 978 nr_make->bpqext = 0; 979 } 980 981 nr_write_internal(make, NR_CONNACK); 982 983 nr_make->condition = 0x00; 984 nr_make->vs = 0; 985 nr_make->va = 0; 986 nr_make->vr = 0; 987 nr_make->vl = 0; 988 nr_make->state = NR_STATE_3; 989 sk->sk_ack_backlog++; 990 991 nr_insert_socket(make); 992 993 skb_queue_head(&sk->sk_receive_queue, skb); 994 995 nr_start_heartbeat(make); 996 nr_start_idletimer(make); 997 998 if (!sock_flag(sk, SOCK_DEAD)) 999 sk->sk_data_ready(sk, skb->len); 1000 1001 bh_unlock_sock(sk); 1002 return 1; 1003 } 1004 1005 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, 1006 struct msghdr *msg, size_t len) 1007 { 1008 struct sock *sk = sock->sk; 1009 struct nr_sock *nr = nr_sk(sk); 1010 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; 1011 int err; 1012 struct sockaddr_ax25 sax; 1013 struct sk_buff *skb; 1014 unsigned char *asmptr; 1015 int size; 1016 1017 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1018 return -EINVAL; 1019 1020 lock_sock(sk); 1021 if (sock_flag(sk, SOCK_ZAPPED)) { 1022 err = -EADDRNOTAVAIL; 1023 goto out; 1024 } 1025 1026 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1027 send_sig(SIGPIPE, current, 0); 1028 err = -EPIPE; 1029 goto out; 1030 } 1031 1032 if (nr->device == NULL) { 1033 err = -ENETUNREACH; 1034 goto out; 1035 } 1036 1037 if (usax) { 1038 if (msg->msg_namelen < sizeof(sax)) { 1039 err = -EINVAL; 1040 goto out; 1041 } 1042 sax = *usax; 1043 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { 1044 err = -EISCONN; 1045 goto out; 1046 } 1047 if (sax.sax25_family != AF_NETROM) { 1048 err = -EINVAL; 1049 goto out; 1050 } 1051 } else { 1052 if (sk->sk_state != TCP_ESTABLISHED) { 1053 err = -ENOTCONN; 1054 goto out; 1055 } 1056 sax.sax25_family = AF_NETROM; 1057 sax.sax25_call = nr->dest_addr; 1058 } 1059 1060 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); 1061 1062 /* Build a packet */ 1063 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); 1064 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; 1065 1066 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) 1067 goto out; 1068 1069 skb_reserve(skb, size - len); 1070 1071 /* 1072 * Push down the NET/ROM header 1073 */ 1074 1075 asmptr = skb_push(skb, NR_TRANSPORT_LEN); 1076 SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); 1077 1078 /* Build a NET/ROM Transport header */ 1079 1080 *asmptr++ = nr->your_index; 1081 *asmptr++ = nr->your_id; 1082 *asmptr++ = 0; /* To be filled in later */ 1083 *asmptr++ = 0; /* Ditto */ 1084 *asmptr++ = NR_INFO; 1085 SOCK_DEBUG(sk, "Built header.\n"); 1086 1087 /* 1088 * Put the data on the end 1089 */ 1090 1091 skb->h.raw = skb_put(skb, len); 1092 1093 asmptr = skb->h.raw; 1094 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); 1095 1096 /* User data follows immediately after the NET/ROM transport header */ 1097 if (memcpy_fromiovec(asmptr, msg->msg_iov, len)) { 1098 kfree_skb(skb); 1099 err = -EFAULT; 1100 goto out; 1101 } 1102 1103 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); 1104 1105 if (sk->sk_state != TCP_ESTABLISHED) { 1106 kfree_skb(skb); 1107 err = -ENOTCONN; 1108 goto out; 1109 } 1110 1111 nr_output(sk, skb); /* Shove it onto the queue */ 1112 1113 err = len; 1114 out: 1115 release_sock(sk); 1116 return err; 1117 } 1118 1119 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, 1120 struct msghdr *msg, size_t size, int flags) 1121 { 1122 struct sock *sk = sock->sk; 1123 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; 1124 size_t copied; 1125 struct sk_buff *skb; 1126 int er; 1127 1128 /* 1129 * This works for seqpacket too. The receiver has ordered the queue for 1130 * us! We do one quick check first though 1131 */ 1132 1133 lock_sock(sk); 1134 if (sk->sk_state != TCP_ESTABLISHED) { 1135 release_sock(sk); 1136 return -ENOTCONN; 1137 } 1138 1139 /* Now we can treat all alike */ 1140 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { 1141 release_sock(sk); 1142 return er; 1143 } 1144 1145 skb->h.raw = skb->data; 1146 copied = skb->len; 1147 1148 if (copied > size) { 1149 copied = size; 1150 msg->msg_flags |= MSG_TRUNC; 1151 } 1152 1153 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1154 1155 if (sax != NULL) { 1156 sax->sax25_family = AF_NETROM; 1157 memcpy(sax->sax25_call.ax25_call, skb->data + 7, AX25_ADDR_LEN); 1158 } 1159 1160 msg->msg_namelen = sizeof(*sax); 1161 1162 skb_free_datagram(sk, skb); 1163 1164 release_sock(sk); 1165 return copied; 1166 } 1167 1168 1169 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1170 { 1171 struct sock *sk = sock->sk; 1172 void __user *argp = (void __user *)arg; 1173 int ret; 1174 1175 switch (cmd) { 1176 case TIOCOUTQ: { 1177 long amount; 1178 1179 lock_sock(sk); 1180 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 1181 if (amount < 0) 1182 amount = 0; 1183 release_sock(sk); 1184 return put_user(amount, (int __user *)argp); 1185 } 1186 1187 case TIOCINQ: { 1188 struct sk_buff *skb; 1189 long amount = 0L; 1190 1191 lock_sock(sk); 1192 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1193 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1194 amount = skb->len; 1195 release_sock(sk); 1196 return put_user(amount, (int __user *)argp); 1197 } 1198 1199 case SIOCGSTAMP: 1200 lock_sock(sk); 1201 ret = sock_get_timestamp(sk, argp); 1202 release_sock(sk); 1203 return ret; 1204 1205 case SIOCGIFADDR: 1206 case SIOCSIFADDR: 1207 case SIOCGIFDSTADDR: 1208 case SIOCSIFDSTADDR: 1209 case SIOCGIFBRDADDR: 1210 case SIOCSIFBRDADDR: 1211 case SIOCGIFNETMASK: 1212 case SIOCSIFNETMASK: 1213 case SIOCGIFMETRIC: 1214 case SIOCSIFMETRIC: 1215 return -EINVAL; 1216 1217 case SIOCADDRT: 1218 case SIOCDELRT: 1219 case SIOCNRDECOBS: 1220 if (!capable(CAP_NET_ADMIN)) return -EPERM; 1221 return nr_rt_ioctl(cmd, argp); 1222 1223 default: 1224 return -ENOIOCTLCMD; 1225 } 1226 1227 return 0; 1228 } 1229 1230 #ifdef CONFIG_PROC_FS 1231 1232 static void *nr_info_start(struct seq_file *seq, loff_t *pos) 1233 { 1234 struct sock *s; 1235 struct hlist_node *node; 1236 int i = 1; 1237 1238 spin_lock_bh(&nr_list_lock); 1239 if (*pos == 0) 1240 return SEQ_START_TOKEN; 1241 1242 sk_for_each(s, node, &nr_list) { 1243 if (i == *pos) 1244 return s; 1245 ++i; 1246 } 1247 return NULL; 1248 } 1249 1250 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) 1251 { 1252 ++*pos; 1253 1254 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list) 1255 : sk_next((struct sock *)v); 1256 } 1257 1258 static void nr_info_stop(struct seq_file *seq, void *v) 1259 { 1260 spin_unlock_bh(&nr_list_lock); 1261 } 1262 1263 static int nr_info_show(struct seq_file *seq, void *v) 1264 { 1265 struct sock *s = v; 1266 struct net_device *dev; 1267 struct nr_sock *nr; 1268 const char *devname; 1269 char buf[11]; 1270 1271 if (v == SEQ_START_TOKEN) 1272 seq_puts(seq, 1273 "user_addr dest_node src_node dev my your st vs vr va t1 t2 t4 idle n2 wnd Snd-Q Rcv-Q inode\n"); 1274 1275 else { 1276 1277 bh_lock_sock(s); 1278 nr = nr_sk(s); 1279 1280 if ((dev = nr->device) == NULL) 1281 devname = "???"; 1282 else 1283 devname = dev->name; 1284 1285 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); 1286 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); 1287 seq_printf(seq, 1288 "%-9s %-3s %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n", 1289 ax2asc(buf, &nr->source_addr), 1290 devname, 1291 nr->my_index, 1292 nr->my_id, 1293 nr->your_index, 1294 nr->your_id, 1295 nr->state, 1296 nr->vs, 1297 nr->vr, 1298 nr->va, 1299 ax25_display_timer(&nr->t1timer) / HZ, 1300 nr->t1 / HZ, 1301 ax25_display_timer(&nr->t2timer) / HZ, 1302 nr->t2 / HZ, 1303 ax25_display_timer(&nr->t4timer) / HZ, 1304 nr->t4 / HZ, 1305 ax25_display_timer(&nr->idletimer) / (60 * HZ), 1306 nr->idle / (60 * HZ), 1307 nr->n2count, 1308 nr->n2, 1309 nr->window, 1310 atomic_read(&s->sk_wmem_alloc), 1311 atomic_read(&s->sk_rmem_alloc), 1312 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); 1313 1314 bh_unlock_sock(s); 1315 } 1316 return 0; 1317 } 1318 1319 static struct seq_operations nr_info_seqops = { 1320 .start = nr_info_start, 1321 .next = nr_info_next, 1322 .stop = nr_info_stop, 1323 .show = nr_info_show, 1324 }; 1325 1326 static int nr_info_open(struct inode *inode, struct file *file) 1327 { 1328 return seq_open(file, &nr_info_seqops); 1329 } 1330 1331 static struct file_operations nr_info_fops = { 1332 .owner = THIS_MODULE, 1333 .open = nr_info_open, 1334 .read = seq_read, 1335 .llseek = seq_lseek, 1336 .release = seq_release, 1337 }; 1338 #endif /* CONFIG_PROC_FS */ 1339 1340 static struct net_proto_family nr_family_ops = { 1341 .family = PF_NETROM, 1342 .create = nr_create, 1343 .owner = THIS_MODULE, 1344 }; 1345 1346 static const struct proto_ops nr_proto_ops = { 1347 .family = PF_NETROM, 1348 .owner = THIS_MODULE, 1349 .release = nr_release, 1350 .bind = nr_bind, 1351 .connect = nr_connect, 1352 .socketpair = sock_no_socketpair, 1353 .accept = nr_accept, 1354 .getname = nr_getname, 1355 .poll = datagram_poll, 1356 .ioctl = nr_ioctl, 1357 .listen = nr_listen, 1358 .shutdown = sock_no_shutdown, 1359 .setsockopt = nr_setsockopt, 1360 .getsockopt = nr_getsockopt, 1361 .sendmsg = nr_sendmsg, 1362 .recvmsg = nr_recvmsg, 1363 .mmap = sock_no_mmap, 1364 .sendpage = sock_no_sendpage, 1365 }; 1366 1367 static struct notifier_block nr_dev_notifier = { 1368 .notifier_call = nr_device_event, 1369 }; 1370 1371 static struct net_device **dev_nr; 1372 1373 static int __init nr_proto_init(void) 1374 { 1375 int i; 1376 int rc = proto_register(&nr_proto, 0); 1377 1378 if (rc != 0) 1379 goto out; 1380 1381 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { 1382 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); 1383 return -1; 1384 } 1385 1386 dev_nr = kmalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); 1387 if (dev_nr == NULL) { 1388 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); 1389 return -1; 1390 } 1391 1392 memset(dev_nr, 0x00, nr_ndevs * sizeof(struct net_device *)); 1393 1394 for (i = 0; i < nr_ndevs; i++) { 1395 char name[IFNAMSIZ]; 1396 struct net_device *dev; 1397 1398 sprintf(name, "nr%d", i); 1399 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup); 1400 if (!dev) { 1401 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); 1402 goto fail; 1403 } 1404 1405 dev->base_addr = i; 1406 if (register_netdev(dev)) { 1407 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); 1408 free_netdev(dev); 1409 goto fail; 1410 } 1411 dev_nr[i] = dev; 1412 } 1413 1414 if (sock_register(&nr_family_ops)) { 1415 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); 1416 goto fail; 1417 } 1418 1419 register_netdevice_notifier(&nr_dev_notifier); 1420 1421 ax25_protocol_register(AX25_P_NETROM, nr_route_frame); 1422 ax25_linkfail_register(nr_link_failed); 1423 1424 #ifdef CONFIG_SYSCTL 1425 nr_register_sysctl(); 1426 #endif 1427 1428 nr_loopback_init(); 1429 1430 proc_net_fops_create("nr", S_IRUGO, &nr_info_fops); 1431 proc_net_fops_create("nr_neigh", S_IRUGO, &nr_neigh_fops); 1432 proc_net_fops_create("nr_nodes", S_IRUGO, &nr_nodes_fops); 1433 out: 1434 return rc; 1435 fail: 1436 while (--i >= 0) { 1437 unregister_netdev(dev_nr[i]); 1438 free_netdev(dev_nr[i]); 1439 } 1440 kfree(dev_nr); 1441 proto_unregister(&nr_proto); 1442 rc = -1; 1443 goto out; 1444 } 1445 1446 module_init(nr_proto_init); 1447 1448 module_param(nr_ndevs, int, 0); 1449 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); 1450 1451 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 1452 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); 1453 MODULE_LICENSE("GPL"); 1454 MODULE_ALIAS_NETPROTO(PF_NETROM); 1455 1456 static void __exit nr_exit(void) 1457 { 1458 int i; 1459 1460 proc_net_remove("nr"); 1461 proc_net_remove("nr_neigh"); 1462 proc_net_remove("nr_nodes"); 1463 nr_loopback_clear(); 1464 1465 nr_rt_free(); 1466 1467 #ifdef CONFIG_SYSCTL 1468 nr_unregister_sysctl(); 1469 #endif 1470 1471 ax25_linkfail_release(nr_link_failed); 1472 ax25_protocol_release(AX25_P_NETROM); 1473 1474 unregister_netdevice_notifier(&nr_dev_notifier); 1475 1476 sock_unregister(PF_NETROM); 1477 1478 for (i = 0; i < nr_ndevs; i++) { 1479 struct net_device *dev = dev_nr[i]; 1480 if (dev) { 1481 unregister_netdev(dev); 1482 free_netdev(dev); 1483 } 1484 } 1485 1486 kfree(dev_nr); 1487 proto_unregister(&nr_proto); 1488 } 1489 module_exit(nr_exit); 1490