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/errno.h> 15 #include <linux/types.h> 16 #include <linux/socket.h> 17 #include <linux/in.h> 18 #include <linux/kernel.h> 19 #include <linux/sched.h> 20 #include <linux/timer.h> 21 #include <linux/string.h> 22 #include <linux/sockios.h> 23 #include <linux/net.h> 24 #include <linux/stat.h> 25 #include <net/ax25.h> 26 #include <linux/inet.h> 27 #include <linux/netdevice.h> 28 #include <linux/if_arp.h> 29 #include <linux/skbuff.h> 30 #include <net/sock.h> 31 #include <asm/uaccess.h> 32 #include <asm/system.h> 33 #include <linux/fcntl.h> 34 #include <linux/termios.h> /* For TIOCINQ/OUTQ */ 35 #include <linux/mm.h> 36 #include <linux/interrupt.h> 37 #include <linux/notifier.h> 38 #include <net/netrom.h> 39 #include <linux/proc_fs.h> 40 #include <linux/seq_file.h> 41 #include <net/ip.h> 42 #include <net/tcp_states.h> 43 #include <net/arp.h> 44 #include <linux/init.h> 45 46 static int nr_ndevs = 4; 47 48 int sysctl_netrom_default_path_quality = NR_DEFAULT_QUAL; 49 int sysctl_netrom_obsolescence_count_initialiser = NR_DEFAULT_OBS; 50 int sysctl_netrom_network_ttl_initialiser = NR_DEFAULT_TTL; 51 int sysctl_netrom_transport_timeout = NR_DEFAULT_T1; 52 int sysctl_netrom_transport_maximum_tries = NR_DEFAULT_N2; 53 int sysctl_netrom_transport_acknowledge_delay = NR_DEFAULT_T2; 54 int sysctl_netrom_transport_busy_delay = NR_DEFAULT_T4; 55 int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW; 56 int sysctl_netrom_transport_no_activity_timeout = NR_DEFAULT_IDLE; 57 int sysctl_netrom_routing_control = NR_DEFAULT_ROUTING; 58 int sysctl_netrom_link_fails_count = NR_DEFAULT_FAILS; 59 int sysctl_netrom_reset_circuit = NR_DEFAULT_RESET; 60 61 static unsigned short circuit = 0x101; 62 63 static HLIST_HEAD(nr_list); 64 static DEFINE_SPINLOCK(nr_list_lock); 65 66 static const struct proto_ops nr_proto_ops; 67 68 /* 69 * Socket removal during an interrupt is now safe. 70 */ 71 static void nr_remove_socket(struct sock *sk) 72 { 73 spin_lock_bh(&nr_list_lock); 74 sk_del_node_init(sk); 75 spin_unlock_bh(&nr_list_lock); 76 } 77 78 /* 79 * Kill all bound sockets on a dropped device. 80 */ 81 static void nr_kill_by_device(struct net_device *dev) 82 { 83 struct sock *s; 84 struct hlist_node *node; 85 86 spin_lock_bh(&nr_list_lock); 87 sk_for_each(s, node, &nr_list) 88 if (nr_sk(s)->device == dev) 89 nr_disconnect(s, ENETUNREACH); 90 spin_unlock_bh(&nr_list_lock); 91 } 92 93 /* 94 * Handle device status changes. 95 */ 96 static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr) 97 { 98 struct net_device *dev = (struct net_device *)ptr; 99 100 if (event != NETDEV_DOWN) 101 return NOTIFY_DONE; 102 103 nr_kill_by_device(dev); 104 nr_rt_device_down(dev); 105 106 return NOTIFY_DONE; 107 } 108 109 /* 110 * Add a socket to the bound sockets list. 111 */ 112 static void nr_insert_socket(struct sock *sk) 113 { 114 spin_lock_bh(&nr_list_lock); 115 sk_add_node(sk, &nr_list); 116 spin_unlock_bh(&nr_list_lock); 117 } 118 119 /* 120 * Find a socket that wants to accept the Connect Request we just 121 * received. 122 */ 123 static struct sock *nr_find_listener(ax25_address *addr) 124 { 125 struct sock *s; 126 struct hlist_node *node; 127 128 spin_lock_bh(&nr_list_lock); 129 sk_for_each(s, node, &nr_list) 130 if (!ax25cmp(&nr_sk(s)->source_addr, addr) && 131 s->sk_state == TCP_LISTEN) { 132 bh_lock_sock(s); 133 goto found; 134 } 135 s = NULL; 136 found: 137 spin_unlock_bh(&nr_list_lock); 138 return s; 139 } 140 141 /* 142 * Find a connected NET/ROM socket given my circuit IDs. 143 */ 144 static struct sock *nr_find_socket(unsigned char index, unsigned char id) 145 { 146 struct sock *s; 147 struct hlist_node *node; 148 149 spin_lock_bh(&nr_list_lock); 150 sk_for_each(s, node, &nr_list) { 151 struct nr_sock *nr = nr_sk(s); 152 153 if (nr->my_index == index && nr->my_id == id) { 154 bh_lock_sock(s); 155 goto found; 156 } 157 } 158 s = NULL; 159 found: 160 spin_unlock_bh(&nr_list_lock); 161 return s; 162 } 163 164 /* 165 * Find a connected NET/ROM socket given their circuit IDs. 166 */ 167 static struct sock *nr_find_peer(unsigned char index, unsigned char id, 168 ax25_address *dest) 169 { 170 struct sock *s; 171 struct hlist_node *node; 172 173 spin_lock_bh(&nr_list_lock); 174 sk_for_each(s, node, &nr_list) { 175 struct nr_sock *nr = nr_sk(s); 176 177 if (nr->your_index == index && nr->your_id == id && 178 !ax25cmp(&nr->dest_addr, dest)) { 179 bh_lock_sock(s); 180 goto found; 181 } 182 } 183 s = NULL; 184 found: 185 spin_unlock_bh(&nr_list_lock); 186 return s; 187 } 188 189 /* 190 * Find next free circuit ID. 191 */ 192 static unsigned short nr_find_next_circuit(void) 193 { 194 unsigned short id = circuit; 195 unsigned char i, j; 196 struct sock *sk; 197 198 for (;;) { 199 i = id / 256; 200 j = id % 256; 201 202 if (i != 0 && j != 0) { 203 if ((sk=nr_find_socket(i, j)) == NULL) 204 break; 205 bh_unlock_sock(sk); 206 } 207 208 id++; 209 } 210 211 return id; 212 } 213 214 /* 215 * Deferred destroy. 216 */ 217 void nr_destroy_socket(struct sock *); 218 219 /* 220 * Handler for deferred kills. 221 */ 222 static void nr_destroy_timer(unsigned long data) 223 { 224 struct sock *sk=(struct sock *)data; 225 bh_lock_sock(sk); 226 sock_hold(sk); 227 nr_destroy_socket(sk); 228 bh_unlock_sock(sk); 229 sock_put(sk); 230 } 231 232 /* 233 * This is called from user mode and the timers. Thus it protects itself 234 * against interrupt users but doesn't worry about being called during 235 * work. Once it is removed from the queue no interrupt or bottom half 236 * will touch it and we are (fairly 8-) ) safe. 237 */ 238 void nr_destroy_socket(struct sock *sk) 239 { 240 struct sk_buff *skb; 241 242 nr_remove_socket(sk); 243 244 nr_stop_heartbeat(sk); 245 nr_stop_t1timer(sk); 246 nr_stop_t2timer(sk); 247 nr_stop_t4timer(sk); 248 nr_stop_idletimer(sk); 249 250 nr_clear_queues(sk); /* Flush the queues */ 251 252 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 253 if (skb->sk != sk) { /* A pending connection */ 254 /* Queue the unaccepted socket for death */ 255 sock_set_flag(skb->sk, SOCK_DEAD); 256 nr_start_heartbeat(skb->sk); 257 nr_sk(skb->sk)->state = NR_STATE_0; 258 } 259 260 kfree_skb(skb); 261 } 262 263 if (atomic_read(&sk->sk_wmem_alloc) || 264 atomic_read(&sk->sk_rmem_alloc)) { 265 /* Defer: outstanding buffers */ 266 sk->sk_timer.function = nr_destroy_timer; 267 sk->sk_timer.expires = jiffies + 2 * HZ; 268 add_timer(&sk->sk_timer); 269 } else 270 sock_put(sk); 271 } 272 273 /* 274 * Handling for system calls applied via the various interfaces to a 275 * NET/ROM socket object. 276 */ 277 278 static int nr_setsockopt(struct socket *sock, int level, int optname, 279 char __user *optval, int optlen) 280 { 281 struct sock *sk = sock->sk; 282 struct nr_sock *nr = nr_sk(sk); 283 int opt; 284 285 if (level != SOL_NETROM) 286 return -ENOPROTOOPT; 287 288 if (optlen < sizeof(int)) 289 return -EINVAL; 290 291 if (get_user(opt, (int __user *)optval)) 292 return -EFAULT; 293 294 switch (optname) { 295 case NETROM_T1: 296 if (opt < 1) 297 return -EINVAL; 298 nr->t1 = opt * HZ; 299 return 0; 300 301 case NETROM_T2: 302 if (opt < 1) 303 return -EINVAL; 304 nr->t2 = opt * HZ; 305 return 0; 306 307 case NETROM_N2: 308 if (opt < 1 || opt > 31) 309 return -EINVAL; 310 nr->n2 = opt; 311 return 0; 312 313 case NETROM_T4: 314 if (opt < 1) 315 return -EINVAL; 316 nr->t4 = opt * HZ; 317 return 0; 318 319 case NETROM_IDLE: 320 if (opt < 0) 321 return -EINVAL; 322 nr->idle = opt * 60 * HZ; 323 return 0; 324 325 default: 326 return -ENOPROTOOPT; 327 } 328 } 329 330 static int nr_getsockopt(struct socket *sock, int level, int optname, 331 char __user *optval, int __user *optlen) 332 { 333 struct sock *sk = sock->sk; 334 struct nr_sock *nr = nr_sk(sk); 335 int val = 0; 336 int len; 337 338 if (level != SOL_NETROM) 339 return -ENOPROTOOPT; 340 341 if (get_user(len, optlen)) 342 return -EFAULT; 343 344 if (len < 0) 345 return -EINVAL; 346 347 switch (optname) { 348 case NETROM_T1: 349 val = nr->t1 / HZ; 350 break; 351 352 case NETROM_T2: 353 val = nr->t2 / HZ; 354 break; 355 356 case NETROM_N2: 357 val = nr->n2; 358 break; 359 360 case NETROM_T4: 361 val = nr->t4 / HZ; 362 break; 363 364 case NETROM_IDLE: 365 val = nr->idle / (60 * HZ); 366 break; 367 368 default: 369 return -ENOPROTOOPT; 370 } 371 372 len = min_t(unsigned int, len, sizeof(int)); 373 374 if (put_user(len, optlen)) 375 return -EFAULT; 376 377 return copy_to_user(optval, &val, len) ? -EFAULT : 0; 378 } 379 380 static int nr_listen(struct socket *sock, int backlog) 381 { 382 struct sock *sk = sock->sk; 383 384 lock_sock(sk); 385 if (sk->sk_state != TCP_LISTEN) { 386 memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN); 387 sk->sk_max_ack_backlog = backlog; 388 sk->sk_state = TCP_LISTEN; 389 release_sock(sk); 390 return 0; 391 } 392 release_sock(sk); 393 394 return -EOPNOTSUPP; 395 } 396 397 static struct proto nr_proto = { 398 .name = "NETROM", 399 .owner = THIS_MODULE, 400 .obj_size = sizeof(struct nr_sock), 401 }; 402 403 static int nr_create(struct socket *sock, int protocol) 404 { 405 struct sock *sk; 406 struct nr_sock *nr; 407 408 if (sock->type != SOCK_SEQPACKET || protocol != 0) 409 return -ESOCKTNOSUPPORT; 410 411 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, &nr_proto, 1)) == NULL) 412 return -ENOMEM; 413 414 nr = nr_sk(sk); 415 416 sock_init_data(sock, sk); 417 418 sock->ops = &nr_proto_ops; 419 sk->sk_protocol = protocol; 420 421 skb_queue_head_init(&nr->ack_queue); 422 skb_queue_head_init(&nr->reseq_queue); 423 skb_queue_head_init(&nr->frag_queue); 424 425 nr_init_timers(sk); 426 427 nr->t1 = sysctl_netrom_transport_timeout; 428 nr->t2 = sysctl_netrom_transport_acknowledge_delay; 429 nr->n2 = sysctl_netrom_transport_maximum_tries; 430 nr->t4 = sysctl_netrom_transport_busy_delay; 431 nr->idle = sysctl_netrom_transport_no_activity_timeout; 432 nr->window = sysctl_netrom_transport_requested_window_size; 433 434 nr->bpqext = 1; 435 nr->state = NR_STATE_0; 436 437 return 0; 438 } 439 440 static struct sock *nr_make_new(struct sock *osk) 441 { 442 struct sock *sk; 443 struct nr_sock *nr, *onr; 444 445 if (osk->sk_type != SOCK_SEQPACKET) 446 return NULL; 447 448 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, osk->sk_prot, 1)) == NULL) 449 return NULL; 450 451 nr = nr_sk(sk); 452 453 sock_init_data(NULL, sk); 454 455 sk->sk_type = osk->sk_type; 456 sk->sk_socket = osk->sk_socket; 457 sk->sk_priority = osk->sk_priority; 458 sk->sk_protocol = osk->sk_protocol; 459 sk->sk_rcvbuf = osk->sk_rcvbuf; 460 sk->sk_sndbuf = osk->sk_sndbuf; 461 sk->sk_state = TCP_ESTABLISHED; 462 sk->sk_sleep = osk->sk_sleep; 463 sock_copy_flags(sk, osk); 464 465 skb_queue_head_init(&nr->ack_queue); 466 skb_queue_head_init(&nr->reseq_queue); 467 skb_queue_head_init(&nr->frag_queue); 468 469 nr_init_timers(sk); 470 471 onr = nr_sk(osk); 472 473 nr->t1 = onr->t1; 474 nr->t2 = onr->t2; 475 nr->n2 = onr->n2; 476 nr->t4 = onr->t4; 477 nr->idle = onr->idle; 478 nr->window = onr->window; 479 480 nr->device = onr->device; 481 nr->bpqext = onr->bpqext; 482 483 return sk; 484 } 485 486 static int nr_release(struct socket *sock) 487 { 488 struct sock *sk = sock->sk; 489 struct nr_sock *nr; 490 491 if (sk == NULL) return 0; 492 493 sock_hold(sk); 494 lock_sock(sk); 495 nr = nr_sk(sk); 496 497 switch (nr->state) { 498 case NR_STATE_0: 499 case NR_STATE_1: 500 case NR_STATE_2: 501 nr_disconnect(sk, 0); 502 nr_destroy_socket(sk); 503 break; 504 505 case NR_STATE_3: 506 nr_clear_queues(sk); 507 nr->n2count = 0; 508 nr_write_internal(sk, NR_DISCREQ); 509 nr_start_t1timer(sk); 510 nr_stop_t2timer(sk); 511 nr_stop_t4timer(sk); 512 nr_stop_idletimer(sk); 513 nr->state = NR_STATE_2; 514 sk->sk_state = TCP_CLOSE; 515 sk->sk_shutdown |= SEND_SHUTDOWN; 516 sk->sk_state_change(sk); 517 sock_orphan(sk); 518 sock_set_flag(sk, SOCK_DESTROY); 519 sk->sk_socket = NULL; 520 break; 521 522 default: 523 sk->sk_socket = NULL; 524 break; 525 } 526 527 sock->sk = NULL; 528 release_sock(sk); 529 sock_put(sk); 530 531 return 0; 532 } 533 534 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 535 { 536 struct sock *sk = sock->sk; 537 struct nr_sock *nr = nr_sk(sk); 538 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 539 struct net_device *dev; 540 ax25_uid_assoc *user; 541 ax25_address *source; 542 543 lock_sock(sk); 544 if (!sock_flag(sk, SOCK_ZAPPED)) { 545 release_sock(sk); 546 return -EINVAL; 547 } 548 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { 549 release_sock(sk); 550 return -EINVAL; 551 } 552 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { 553 release_sock(sk); 554 return -EINVAL; 555 } 556 if (addr->fsa_ax25.sax25_family != AF_NETROM) { 557 release_sock(sk); 558 return -EINVAL; 559 } 560 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { 561 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); 562 release_sock(sk); 563 return -EADDRNOTAVAIL; 564 } 565 566 /* 567 * Only the super user can set an arbitrary user callsign. 568 */ 569 if (addr->fsa_ax25.sax25_ndigis == 1) { 570 if (!capable(CAP_NET_BIND_SERVICE)) { 571 dev_put(dev); 572 release_sock(sk); 573 return -EACCES; 574 } 575 nr->user_addr = addr->fsa_digipeater[0]; 576 nr->source_addr = addr->fsa_ax25.sax25_call; 577 } else { 578 source = &addr->fsa_ax25.sax25_call; 579 580 user = ax25_findbyuid(current->euid); 581 if (user) { 582 nr->user_addr = user->call; 583 ax25_uid_put(user); 584 } else { 585 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { 586 release_sock(sk); 587 dev_put(dev); 588 return -EPERM; 589 } 590 nr->user_addr = *source; 591 } 592 593 nr->source_addr = *source; 594 } 595 596 nr->device = dev; 597 nr_insert_socket(sk); 598 599 sock_reset_flag(sk, SOCK_ZAPPED); 600 dev_put(dev); 601 release_sock(sk); 602 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); 603 return 0; 604 } 605 606 static int nr_connect(struct socket *sock, struct sockaddr *uaddr, 607 int addr_len, int flags) 608 { 609 struct sock *sk = sock->sk; 610 struct nr_sock *nr = nr_sk(sk); 611 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; 612 ax25_address *source = NULL; 613 ax25_uid_assoc *user; 614 struct net_device *dev; 615 616 lock_sock(sk); 617 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 618 sock->state = SS_CONNECTED; 619 release_sock(sk); 620 return 0; /* Connect completed during a ERESTARTSYS event */ 621 } 622 623 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 624 sock->state = SS_UNCONNECTED; 625 release_sock(sk); 626 return -ECONNREFUSED; 627 } 628 629 if (sk->sk_state == TCP_ESTABLISHED) { 630 release_sock(sk); 631 return -EISCONN; /* No reconnect on a seqpacket socket */ 632 } 633 634 sk->sk_state = TCP_CLOSE; 635 sock->state = SS_UNCONNECTED; 636 637 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { 638 release_sock(sk); 639 return -EINVAL; 640 } 641 if (addr->sax25_family != AF_NETROM) { 642 release_sock(sk); 643 return -EINVAL; 644 } 645 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ 646 sock_reset_flag(sk, SOCK_ZAPPED); 647 648 if ((dev = nr_dev_first()) == NULL) { 649 release_sock(sk); 650 return -ENETUNREACH; 651 } 652 source = (ax25_address *)dev->dev_addr; 653 654 user = ax25_findbyuid(current->euid); 655 if (user) { 656 nr->user_addr = user->call; 657 ax25_uid_put(user); 658 } else { 659 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { 660 dev_put(dev); 661 release_sock(sk); 662 return -EPERM; 663 } 664 nr->user_addr = *source; 665 } 666 667 nr->source_addr = *source; 668 nr->device = dev; 669 670 dev_put(dev); 671 nr_insert_socket(sk); /* Finish the bind */ 672 } 673 674 nr->dest_addr = addr->sax25_call; 675 676 release_sock(sk); 677 circuit = nr_find_next_circuit(); 678 lock_sock(sk); 679 680 nr->my_index = circuit / 256; 681 nr->my_id = circuit % 256; 682 683 circuit++; 684 685 /* Move to connecting socket, start sending Connect Requests */ 686 sock->state = SS_CONNECTING; 687 sk->sk_state = TCP_SYN_SENT; 688 689 nr_establish_data_link(sk); 690 691 nr->state = NR_STATE_1; 692 693 nr_start_heartbeat(sk); 694 695 /* Now the loop */ 696 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 697 release_sock(sk); 698 return -EINPROGRESS; 699 } 700 701 /* 702 * A Connect Ack with Choke or timeout or failed routing will go to 703 * closed. 704 */ 705 if (sk->sk_state == TCP_SYN_SENT) { 706 struct task_struct *tsk = current; 707 DECLARE_WAITQUEUE(wait, tsk); 708 709 add_wait_queue(sk->sk_sleep, &wait); 710 for (;;) { 711 set_current_state(TASK_INTERRUPTIBLE); 712 if (sk->sk_state != TCP_SYN_SENT) 713 break; 714 release_sock(sk); 715 if (!signal_pending(tsk)) { 716 schedule(); 717 lock_sock(sk); 718 continue; 719 } 720 current->state = TASK_RUNNING; 721 remove_wait_queue(sk->sk_sleep, &wait); 722 return -ERESTARTSYS; 723 } 724 current->state = TASK_RUNNING; 725 remove_wait_queue(sk->sk_sleep, &wait); 726 } 727 728 if (sk->sk_state != TCP_ESTABLISHED) { 729 sock->state = SS_UNCONNECTED; 730 release_sock(sk); 731 return sock_error(sk); /* Always set at this point */ 732 } 733 734 sock->state = SS_CONNECTED; 735 release_sock(sk); 736 737 return 0; 738 } 739 740 static int nr_accept(struct socket *sock, struct socket *newsock, int flags) 741 { 742 struct task_struct *tsk = current; 743 DECLARE_WAITQUEUE(wait, tsk); 744 struct sk_buff *skb; 745 struct sock *newsk; 746 struct sock *sk; 747 int err = 0; 748 749 if ((sk = sock->sk) == NULL) 750 return -EINVAL; 751 752 lock_sock(sk); 753 if (sk->sk_type != SOCK_SEQPACKET) { 754 err = -EOPNOTSUPP; 755 goto out; 756 } 757 758 if (sk->sk_state != TCP_LISTEN) { 759 err = -EINVAL; 760 goto out; 761 } 762 763 /* 764 * The write queue this time is holding sockets ready to use 765 * hooked into the SABM we saved 766 */ 767 add_wait_queue(sk->sk_sleep, &wait); 768 for (;;) { 769 skb = skb_dequeue(&sk->sk_receive_queue); 770 if (skb) 771 break; 772 773 current->state = TASK_INTERRUPTIBLE; 774 release_sock(sk); 775 if (flags & O_NONBLOCK) { 776 current->state = TASK_RUNNING; 777 remove_wait_queue(sk->sk_sleep, &wait); 778 return -EWOULDBLOCK; 779 } 780 if (!signal_pending(tsk)) { 781 schedule(); 782 lock_sock(sk); 783 continue; 784 } 785 current->state = TASK_RUNNING; 786 remove_wait_queue(sk->sk_sleep, &wait); 787 return -ERESTARTSYS; 788 } 789 current->state = TASK_RUNNING; 790 remove_wait_queue(sk->sk_sleep, &wait); 791 792 newsk = skb->sk; 793 newsk->sk_socket = newsock; 794 newsk->sk_sleep = &newsock->wait; 795 796 /* Now attach up the new socket */ 797 kfree_skb(skb); 798 sk->sk_ack_backlog--; 799 newsock->sk = newsk; 800 801 out: 802 release_sock(sk); 803 return err; 804 } 805 806 static int nr_getname(struct socket *sock, struct sockaddr *uaddr, 807 int *uaddr_len, int peer) 808 { 809 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; 810 struct sock *sk = sock->sk; 811 struct nr_sock *nr = nr_sk(sk); 812 813 lock_sock(sk); 814 if (peer != 0) { 815 if (sk->sk_state != TCP_ESTABLISHED) { 816 release_sock(sk); 817 return -ENOTCONN; 818 } 819 sax->fsa_ax25.sax25_family = AF_NETROM; 820 sax->fsa_ax25.sax25_ndigis = 1; 821 sax->fsa_ax25.sax25_call = nr->user_addr; 822 sax->fsa_digipeater[0] = nr->dest_addr; 823 *uaddr_len = sizeof(struct full_sockaddr_ax25); 824 } else { 825 sax->fsa_ax25.sax25_family = AF_NETROM; 826 sax->fsa_ax25.sax25_ndigis = 0; 827 sax->fsa_ax25.sax25_call = nr->source_addr; 828 *uaddr_len = sizeof(struct sockaddr_ax25); 829 } 830 release_sock(sk); 831 832 return 0; 833 } 834 835 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) 836 { 837 struct sock *sk; 838 struct sock *make; 839 struct nr_sock *nr_make; 840 ax25_address *src, *dest, *user; 841 unsigned short circuit_index, circuit_id; 842 unsigned short peer_circuit_index, peer_circuit_id; 843 unsigned short frametype, flags, window, timeout; 844 int ret; 845 846 skb->sk = NULL; /* Initially we don't know who it's for */ 847 848 /* 849 * skb->data points to the netrom frame start 850 */ 851 852 src = (ax25_address *)(skb->data + 0); 853 dest = (ax25_address *)(skb->data + 7); 854 855 circuit_index = skb->data[15]; 856 circuit_id = skb->data[16]; 857 peer_circuit_index = skb->data[17]; 858 peer_circuit_id = skb->data[18]; 859 frametype = skb->data[19] & 0x0F; 860 flags = skb->data[19] & 0xF0; 861 862 /* 863 * Check for an incoming IP over NET/ROM frame. 864 */ 865 if (frametype == NR_PROTOEXT && 866 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { 867 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); 868 skb->h.raw = skb->data; 869 870 return nr_rx_ip(skb, dev); 871 } 872 873 /* 874 * Find an existing socket connection, based on circuit ID, if it's 875 * a Connect Request base it on their circuit ID. 876 * 877 * Circuit ID 0/0 is not valid but it could still be a "reset" for a 878 * circuit that no longer exists at the other end ... 879 */ 880 881 sk = NULL; 882 883 if (circuit_index == 0 && circuit_id == 0) { 884 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) 885 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); 886 } else { 887 if (frametype == NR_CONNREQ) 888 sk = nr_find_peer(circuit_index, circuit_id, src); 889 else 890 sk = nr_find_socket(circuit_index, circuit_id); 891 } 892 893 if (sk != NULL) { 894 skb->h.raw = skb->data; 895 896 if (frametype == NR_CONNACK && skb->len == 22) 897 nr_sk(sk)->bpqext = 1; 898 else 899 nr_sk(sk)->bpqext = 0; 900 901 ret = nr_process_rx_frame(sk, skb); 902 bh_unlock_sock(sk); 903 return ret; 904 } 905 906 /* 907 * Now it should be a CONNREQ. 908 */ 909 if (frametype != NR_CONNREQ) { 910 /* 911 * Here it would be nice to be able to send a reset but 912 * NET/ROM doesn't have one. We've tried to extend the protocol 913 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that 914 * apparently kills BPQ boxes... :-( 915 * So now we try to follow the established behaviour of 916 * G8PZT's Xrouter which is sending packets with command type 7 917 * as an extension of the protocol. 918 */ 919 if (sysctl_netrom_reset_circuit && 920 (frametype != NR_RESET || flags != 0)) 921 nr_transmit_reset(skb, 1); 922 923 return 0; 924 } 925 926 sk = nr_find_listener(dest); 927 928 user = (ax25_address *)(skb->data + 21); 929 930 if (sk == NULL || sk_acceptq_is_full(sk) || 931 (make = nr_make_new(sk)) == NULL) { 932 nr_transmit_refusal(skb, 0); 933 if (sk) 934 bh_unlock_sock(sk); 935 return 0; 936 } 937 938 window = skb->data[20]; 939 940 skb->sk = make; 941 make->sk_state = TCP_ESTABLISHED; 942 943 /* Fill in his circuit details */ 944 nr_make = nr_sk(make); 945 nr_make->source_addr = *dest; 946 nr_make->dest_addr = *src; 947 nr_make->user_addr = *user; 948 949 nr_make->your_index = circuit_index; 950 nr_make->your_id = circuit_id; 951 952 bh_unlock_sock(sk); 953 circuit = nr_find_next_circuit(); 954 bh_lock_sock(sk); 955 956 nr_make->my_index = circuit / 256; 957 nr_make->my_id = circuit % 256; 958 959 circuit++; 960 961 /* Window negotiation */ 962 if (window < nr_make->window) 963 nr_make->window = window; 964 965 /* L4 timeout negotiation */ 966 if (skb->len == 37) { 967 timeout = skb->data[36] * 256 + skb->data[35]; 968 if (timeout * HZ < nr_make->t1) 969 nr_make->t1 = timeout * HZ; 970 nr_make->bpqext = 1; 971 } else { 972 nr_make->bpqext = 0; 973 } 974 975 nr_write_internal(make, NR_CONNACK); 976 977 nr_make->condition = 0x00; 978 nr_make->vs = 0; 979 nr_make->va = 0; 980 nr_make->vr = 0; 981 nr_make->vl = 0; 982 nr_make->state = NR_STATE_3; 983 sk->sk_ack_backlog++; 984 985 nr_insert_socket(make); 986 987 skb_queue_head(&sk->sk_receive_queue, skb); 988 989 nr_start_heartbeat(make); 990 nr_start_idletimer(make); 991 992 if (!sock_flag(sk, SOCK_DEAD)) 993 sk->sk_data_ready(sk, skb->len); 994 995 bh_unlock_sock(sk); 996 return 1; 997 } 998 999 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, 1000 struct msghdr *msg, size_t len) 1001 { 1002 struct sock *sk = sock->sk; 1003 struct nr_sock *nr = nr_sk(sk); 1004 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; 1005 int err; 1006 struct sockaddr_ax25 sax; 1007 struct sk_buff *skb; 1008 unsigned char *asmptr; 1009 int size; 1010 1011 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1012 return -EINVAL; 1013 1014 lock_sock(sk); 1015 if (sock_flag(sk, SOCK_ZAPPED)) { 1016 err = -EADDRNOTAVAIL; 1017 goto out; 1018 } 1019 1020 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1021 send_sig(SIGPIPE, current, 0); 1022 err = -EPIPE; 1023 goto out; 1024 } 1025 1026 if (nr->device == NULL) { 1027 err = -ENETUNREACH; 1028 goto out; 1029 } 1030 1031 if (usax) { 1032 if (msg->msg_namelen < sizeof(sax)) { 1033 err = -EINVAL; 1034 goto out; 1035 } 1036 sax = *usax; 1037 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { 1038 err = -EISCONN; 1039 goto out; 1040 } 1041 if (sax.sax25_family != AF_NETROM) { 1042 err = -EINVAL; 1043 goto out; 1044 } 1045 } else { 1046 if (sk->sk_state != TCP_ESTABLISHED) { 1047 err = -ENOTCONN; 1048 goto out; 1049 } 1050 sax.sax25_family = AF_NETROM; 1051 sax.sax25_call = nr->dest_addr; 1052 } 1053 1054 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); 1055 1056 /* Build a packet */ 1057 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); 1058 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; 1059 1060 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) 1061 goto out; 1062 1063 skb_reserve(skb, size - len); 1064 1065 /* 1066 * Push down the NET/ROM header 1067 */ 1068 1069 asmptr = skb_push(skb, NR_TRANSPORT_LEN); 1070 SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); 1071 1072 /* Build a NET/ROM Transport header */ 1073 1074 *asmptr++ = nr->your_index; 1075 *asmptr++ = nr->your_id; 1076 *asmptr++ = 0; /* To be filled in later */ 1077 *asmptr++ = 0; /* Ditto */ 1078 *asmptr++ = NR_INFO; 1079 SOCK_DEBUG(sk, "Built header.\n"); 1080 1081 /* 1082 * Put the data on the end 1083 */ 1084 1085 skb->h.raw = skb_put(skb, len); 1086 1087 asmptr = skb->h.raw; 1088 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); 1089 1090 /* User data follows immediately after the NET/ROM transport header */ 1091 if (memcpy_fromiovec(asmptr, msg->msg_iov, len)) { 1092 kfree_skb(skb); 1093 err = -EFAULT; 1094 goto out; 1095 } 1096 1097 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); 1098 1099 if (sk->sk_state != TCP_ESTABLISHED) { 1100 kfree_skb(skb); 1101 err = -ENOTCONN; 1102 goto out; 1103 } 1104 1105 nr_output(sk, skb); /* Shove it onto the queue */ 1106 1107 err = len; 1108 out: 1109 release_sock(sk); 1110 return err; 1111 } 1112 1113 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, 1114 struct msghdr *msg, size_t size, int flags) 1115 { 1116 struct sock *sk = sock->sk; 1117 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; 1118 size_t copied; 1119 struct sk_buff *skb; 1120 int er; 1121 1122 /* 1123 * This works for seqpacket too. The receiver has ordered the queue for 1124 * us! We do one quick check first though 1125 */ 1126 1127 lock_sock(sk); 1128 if (sk->sk_state != TCP_ESTABLISHED) { 1129 release_sock(sk); 1130 return -ENOTCONN; 1131 } 1132 1133 /* Now we can treat all alike */ 1134 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { 1135 release_sock(sk); 1136 return er; 1137 } 1138 1139 skb->h.raw = skb->data; 1140 copied = skb->len; 1141 1142 if (copied > size) { 1143 copied = size; 1144 msg->msg_flags |= MSG_TRUNC; 1145 } 1146 1147 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1148 1149 if (sax != NULL) { 1150 sax->sax25_family = AF_NETROM; 1151 memcpy(sax->sax25_call.ax25_call, skb->data + 7, AX25_ADDR_LEN); 1152 } 1153 1154 msg->msg_namelen = sizeof(*sax); 1155 1156 skb_free_datagram(sk, skb); 1157 1158 release_sock(sk); 1159 return copied; 1160 } 1161 1162 1163 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1164 { 1165 struct sock *sk = sock->sk; 1166 void __user *argp = (void __user *)arg; 1167 int ret; 1168 1169 switch (cmd) { 1170 case TIOCOUTQ: { 1171 long amount; 1172 1173 lock_sock(sk); 1174 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 1175 if (amount < 0) 1176 amount = 0; 1177 release_sock(sk); 1178 return put_user(amount, (int __user *)argp); 1179 } 1180 1181 case TIOCINQ: { 1182 struct sk_buff *skb; 1183 long amount = 0L; 1184 1185 lock_sock(sk); 1186 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1187 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1188 amount = skb->len; 1189 release_sock(sk); 1190 return put_user(amount, (int __user *)argp); 1191 } 1192 1193 case SIOCGSTAMP: 1194 lock_sock(sk); 1195 ret = sock_get_timestamp(sk, argp); 1196 release_sock(sk); 1197 return ret; 1198 1199 case SIOCGIFADDR: 1200 case SIOCSIFADDR: 1201 case SIOCGIFDSTADDR: 1202 case SIOCSIFDSTADDR: 1203 case SIOCGIFBRDADDR: 1204 case SIOCSIFBRDADDR: 1205 case SIOCGIFNETMASK: 1206 case SIOCSIFNETMASK: 1207 case SIOCGIFMETRIC: 1208 case SIOCSIFMETRIC: 1209 return -EINVAL; 1210 1211 case SIOCADDRT: 1212 case SIOCDELRT: 1213 case SIOCNRDECOBS: 1214 if (!capable(CAP_NET_ADMIN)) return -EPERM; 1215 return nr_rt_ioctl(cmd, argp); 1216 1217 default: 1218 return -ENOIOCTLCMD; 1219 } 1220 1221 return 0; 1222 } 1223 1224 #ifdef CONFIG_PROC_FS 1225 1226 static void *nr_info_start(struct seq_file *seq, loff_t *pos) 1227 { 1228 struct sock *s; 1229 struct hlist_node *node; 1230 int i = 1; 1231 1232 spin_lock_bh(&nr_list_lock); 1233 if (*pos == 0) 1234 return SEQ_START_TOKEN; 1235 1236 sk_for_each(s, node, &nr_list) { 1237 if (i == *pos) 1238 return s; 1239 ++i; 1240 } 1241 return NULL; 1242 } 1243 1244 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) 1245 { 1246 ++*pos; 1247 1248 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list) 1249 : sk_next((struct sock *)v); 1250 } 1251 1252 static void nr_info_stop(struct seq_file *seq, void *v) 1253 { 1254 spin_unlock_bh(&nr_list_lock); 1255 } 1256 1257 static int nr_info_show(struct seq_file *seq, void *v) 1258 { 1259 struct sock *s = v; 1260 struct net_device *dev; 1261 struct nr_sock *nr; 1262 const char *devname; 1263 char buf[11]; 1264 1265 if (v == SEQ_START_TOKEN) 1266 seq_puts(seq, 1267 "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"); 1268 1269 else { 1270 1271 bh_lock_sock(s); 1272 nr = nr_sk(s); 1273 1274 if ((dev = nr->device) == NULL) 1275 devname = "???"; 1276 else 1277 devname = dev->name; 1278 1279 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); 1280 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); 1281 seq_printf(seq, 1282 "%-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", 1283 ax2asc(buf, &nr->source_addr), 1284 devname, 1285 nr->my_index, 1286 nr->my_id, 1287 nr->your_index, 1288 nr->your_id, 1289 nr->state, 1290 nr->vs, 1291 nr->vr, 1292 nr->va, 1293 ax25_display_timer(&nr->t1timer) / HZ, 1294 nr->t1 / HZ, 1295 ax25_display_timer(&nr->t2timer) / HZ, 1296 nr->t2 / HZ, 1297 ax25_display_timer(&nr->t4timer) / HZ, 1298 nr->t4 / HZ, 1299 ax25_display_timer(&nr->idletimer) / (60 * HZ), 1300 nr->idle / (60 * HZ), 1301 nr->n2count, 1302 nr->n2, 1303 nr->window, 1304 atomic_read(&s->sk_wmem_alloc), 1305 atomic_read(&s->sk_rmem_alloc), 1306 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); 1307 1308 bh_unlock_sock(s); 1309 } 1310 return 0; 1311 } 1312 1313 static struct seq_operations nr_info_seqops = { 1314 .start = nr_info_start, 1315 .next = nr_info_next, 1316 .stop = nr_info_stop, 1317 .show = nr_info_show, 1318 }; 1319 1320 static int nr_info_open(struct inode *inode, struct file *file) 1321 { 1322 return seq_open(file, &nr_info_seqops); 1323 } 1324 1325 static struct file_operations nr_info_fops = { 1326 .owner = THIS_MODULE, 1327 .open = nr_info_open, 1328 .read = seq_read, 1329 .llseek = seq_lseek, 1330 .release = seq_release, 1331 }; 1332 #endif /* CONFIG_PROC_FS */ 1333 1334 static struct net_proto_family nr_family_ops = { 1335 .family = PF_NETROM, 1336 .create = nr_create, 1337 .owner = THIS_MODULE, 1338 }; 1339 1340 static const struct proto_ops nr_proto_ops = { 1341 .family = PF_NETROM, 1342 .owner = THIS_MODULE, 1343 .release = nr_release, 1344 .bind = nr_bind, 1345 .connect = nr_connect, 1346 .socketpair = sock_no_socketpair, 1347 .accept = nr_accept, 1348 .getname = nr_getname, 1349 .poll = datagram_poll, 1350 .ioctl = nr_ioctl, 1351 .listen = nr_listen, 1352 .shutdown = sock_no_shutdown, 1353 .setsockopt = nr_setsockopt, 1354 .getsockopt = nr_getsockopt, 1355 .sendmsg = nr_sendmsg, 1356 .recvmsg = nr_recvmsg, 1357 .mmap = sock_no_mmap, 1358 .sendpage = sock_no_sendpage, 1359 }; 1360 1361 static struct notifier_block nr_dev_notifier = { 1362 .notifier_call = nr_device_event, 1363 }; 1364 1365 static struct net_device **dev_nr; 1366 1367 static char banner[] __initdata = KERN_INFO "G4KLX NET/ROM for Linux. Version 0.7 for AX25.037 Linux 2.4\n"; 1368 1369 static int __init nr_proto_init(void) 1370 { 1371 int i; 1372 int rc = proto_register(&nr_proto, 0); 1373 1374 if (rc != 0) 1375 goto out; 1376 1377 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { 1378 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); 1379 return -1; 1380 } 1381 1382 dev_nr = kmalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); 1383 if (dev_nr == NULL) { 1384 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); 1385 return -1; 1386 } 1387 1388 memset(dev_nr, 0x00, nr_ndevs * sizeof(struct net_device *)); 1389 1390 for (i = 0; i < nr_ndevs; i++) { 1391 char name[IFNAMSIZ]; 1392 struct net_device *dev; 1393 1394 sprintf(name, "nr%d", i); 1395 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup); 1396 if (!dev) { 1397 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); 1398 goto fail; 1399 } 1400 1401 dev->base_addr = i; 1402 if (register_netdev(dev)) { 1403 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); 1404 free_netdev(dev); 1405 goto fail; 1406 } 1407 dev_nr[i] = dev; 1408 } 1409 1410 if (sock_register(&nr_family_ops)) { 1411 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); 1412 goto fail; 1413 } 1414 1415 register_netdevice_notifier(&nr_dev_notifier); 1416 printk(banner); 1417 1418 ax25_protocol_register(AX25_P_NETROM, nr_route_frame); 1419 ax25_linkfail_register(nr_link_failed); 1420 1421 #ifdef CONFIG_SYSCTL 1422 nr_register_sysctl(); 1423 #endif 1424 1425 nr_loopback_init(); 1426 1427 proc_net_fops_create("nr", S_IRUGO, &nr_info_fops); 1428 proc_net_fops_create("nr_neigh", S_IRUGO, &nr_neigh_fops); 1429 proc_net_fops_create("nr_nodes", S_IRUGO, &nr_nodes_fops); 1430 out: 1431 return rc; 1432 fail: 1433 while (--i >= 0) { 1434 unregister_netdev(dev_nr[i]); 1435 free_netdev(dev_nr[i]); 1436 } 1437 kfree(dev_nr); 1438 proto_unregister(&nr_proto); 1439 rc = -1; 1440 goto out; 1441 } 1442 1443 module_init(nr_proto_init); 1444 1445 module_param(nr_ndevs, int, 0); 1446 MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices"); 1447 1448 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>"); 1449 MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol"); 1450 MODULE_LICENSE("GPL"); 1451 MODULE_ALIAS_NETPROTO(PF_NETROM); 1452 1453 static void __exit nr_exit(void) 1454 { 1455 int i; 1456 1457 proc_net_remove("nr"); 1458 proc_net_remove("nr_neigh"); 1459 proc_net_remove("nr_nodes"); 1460 nr_loopback_clear(); 1461 1462 nr_rt_free(); 1463 1464 #ifdef CONFIG_SYSCTL 1465 nr_unregister_sysctl(); 1466 #endif 1467 1468 ax25_linkfail_release(nr_link_failed); 1469 ax25_protocol_release(AX25_P_NETROM); 1470 1471 unregister_netdevice_notifier(&nr_dev_notifier); 1472 1473 sock_unregister(PF_NETROM); 1474 1475 for (i = 0; i < nr_ndevs; i++) { 1476 struct net_device *dev = dev_nr[i]; 1477 if (dev) { 1478 unregister_netdev(dev); 1479 free_netdev(dev); 1480 } 1481 } 1482 1483 kfree(dev_nr); 1484 proto_unregister(&nr_proto); 1485 } 1486 module_exit(nr_exit); 1487