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/module.h> 12 #include <linux/moduleparam.h> 13 #include <linux/capability.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 = 428 msecs_to_jiffies(sysctl_netrom_transport_timeout); 429 nr->t2 = 430 msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay); 431 nr->n2 = 432 msecs_to_jiffies(sysctl_netrom_transport_maximum_tries); 433 nr->t4 = 434 msecs_to_jiffies(sysctl_netrom_transport_busy_delay); 435 nr->idle = 436 msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); 437 nr->window = sysctl_netrom_transport_requested_window_size; 438 439 nr->bpqext = 1; 440 nr->state = NR_STATE_0; 441 442 return 0; 443 } 444 445 static struct sock *nr_make_new(struct sock *osk) 446 { 447 struct sock *sk; 448 struct nr_sock *nr, *onr; 449 450 if (osk->sk_type != SOCK_SEQPACKET) 451 return NULL; 452 453 if ((sk = sk_alloc(PF_NETROM, GFP_ATOMIC, osk->sk_prot, 1)) == NULL) 454 return NULL; 455 456 nr = nr_sk(sk); 457 458 sock_init_data(NULL, sk); 459 460 sk->sk_type = osk->sk_type; 461 sk->sk_socket = osk->sk_socket; 462 sk->sk_priority = osk->sk_priority; 463 sk->sk_protocol = osk->sk_protocol; 464 sk->sk_rcvbuf = osk->sk_rcvbuf; 465 sk->sk_sndbuf = osk->sk_sndbuf; 466 sk->sk_state = TCP_ESTABLISHED; 467 sk->sk_sleep = osk->sk_sleep; 468 sock_copy_flags(sk, osk); 469 470 skb_queue_head_init(&nr->ack_queue); 471 skb_queue_head_init(&nr->reseq_queue); 472 skb_queue_head_init(&nr->frag_queue); 473 474 nr_init_timers(sk); 475 476 onr = nr_sk(osk); 477 478 nr->t1 = onr->t1; 479 nr->t2 = onr->t2; 480 nr->n2 = onr->n2; 481 nr->t4 = onr->t4; 482 nr->idle = onr->idle; 483 nr->window = onr->window; 484 485 nr->device = onr->device; 486 nr->bpqext = onr->bpqext; 487 488 return sk; 489 } 490 491 static int nr_release(struct socket *sock) 492 { 493 struct sock *sk = sock->sk; 494 struct nr_sock *nr; 495 496 if (sk == NULL) return 0; 497 498 sock_hold(sk); 499 lock_sock(sk); 500 nr = nr_sk(sk); 501 502 switch (nr->state) { 503 case NR_STATE_0: 504 case NR_STATE_1: 505 case NR_STATE_2: 506 nr_disconnect(sk, 0); 507 nr_destroy_socket(sk); 508 break; 509 510 case NR_STATE_3: 511 nr_clear_queues(sk); 512 nr->n2count = 0; 513 nr_write_internal(sk, NR_DISCREQ); 514 nr_start_t1timer(sk); 515 nr_stop_t2timer(sk); 516 nr_stop_t4timer(sk); 517 nr_stop_idletimer(sk); 518 nr->state = NR_STATE_2; 519 sk->sk_state = TCP_CLOSE; 520 sk->sk_shutdown |= SEND_SHUTDOWN; 521 sk->sk_state_change(sk); 522 sock_orphan(sk); 523 sock_set_flag(sk, SOCK_DESTROY); 524 sk->sk_socket = NULL; 525 break; 526 527 default: 528 sk->sk_socket = NULL; 529 break; 530 } 531 532 sock->sk = NULL; 533 release_sock(sk); 534 sock_put(sk); 535 536 return 0; 537 } 538 539 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 540 { 541 struct sock *sk = sock->sk; 542 struct nr_sock *nr = nr_sk(sk); 543 struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr; 544 struct net_device *dev; 545 ax25_uid_assoc *user; 546 ax25_address *source; 547 548 lock_sock(sk); 549 if (!sock_flag(sk, SOCK_ZAPPED)) { 550 release_sock(sk); 551 return -EINVAL; 552 } 553 if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) { 554 release_sock(sk); 555 return -EINVAL; 556 } 557 if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) { 558 release_sock(sk); 559 return -EINVAL; 560 } 561 if (addr->fsa_ax25.sax25_family != AF_NETROM) { 562 release_sock(sk); 563 return -EINVAL; 564 } 565 if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) { 566 SOCK_DEBUG(sk, "NET/ROM: bind failed: invalid node callsign\n"); 567 release_sock(sk); 568 return -EADDRNOTAVAIL; 569 } 570 571 /* 572 * Only the super user can set an arbitrary user callsign. 573 */ 574 if (addr->fsa_ax25.sax25_ndigis == 1) { 575 if (!capable(CAP_NET_BIND_SERVICE)) { 576 dev_put(dev); 577 release_sock(sk); 578 return -EACCES; 579 } 580 nr->user_addr = addr->fsa_digipeater[0]; 581 nr->source_addr = addr->fsa_ax25.sax25_call; 582 } else { 583 source = &addr->fsa_ax25.sax25_call; 584 585 user = ax25_findbyuid(current->euid); 586 if (user) { 587 nr->user_addr = user->call; 588 ax25_uid_put(user); 589 } else { 590 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { 591 release_sock(sk); 592 dev_put(dev); 593 return -EPERM; 594 } 595 nr->user_addr = *source; 596 } 597 598 nr->source_addr = *source; 599 } 600 601 nr->device = dev; 602 nr_insert_socket(sk); 603 604 sock_reset_flag(sk, SOCK_ZAPPED); 605 dev_put(dev); 606 release_sock(sk); 607 SOCK_DEBUG(sk, "NET/ROM: socket is bound\n"); 608 return 0; 609 } 610 611 static int nr_connect(struct socket *sock, struct sockaddr *uaddr, 612 int addr_len, int flags) 613 { 614 struct sock *sk = sock->sk; 615 struct nr_sock *nr = nr_sk(sk); 616 struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr; 617 ax25_address *source = NULL; 618 ax25_uid_assoc *user; 619 struct net_device *dev; 620 621 lock_sock(sk); 622 if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) { 623 sock->state = SS_CONNECTED; 624 release_sock(sk); 625 return 0; /* Connect completed during a ERESTARTSYS event */ 626 } 627 628 if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) { 629 sock->state = SS_UNCONNECTED; 630 release_sock(sk); 631 return -ECONNREFUSED; 632 } 633 634 if (sk->sk_state == TCP_ESTABLISHED) { 635 release_sock(sk); 636 return -EISCONN; /* No reconnect on a seqpacket socket */ 637 } 638 639 sk->sk_state = TCP_CLOSE; 640 sock->state = SS_UNCONNECTED; 641 642 if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) { 643 release_sock(sk); 644 return -EINVAL; 645 } 646 if (addr->sax25_family != AF_NETROM) { 647 release_sock(sk); 648 return -EINVAL; 649 } 650 if (sock_flag(sk, SOCK_ZAPPED)) { /* Must bind first - autobinding in this may or may not work */ 651 sock_reset_flag(sk, SOCK_ZAPPED); 652 653 if ((dev = nr_dev_first()) == NULL) { 654 release_sock(sk); 655 return -ENETUNREACH; 656 } 657 source = (ax25_address *)dev->dev_addr; 658 659 user = ax25_findbyuid(current->euid); 660 if (user) { 661 nr->user_addr = user->call; 662 ax25_uid_put(user); 663 } else { 664 if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) { 665 dev_put(dev); 666 release_sock(sk); 667 return -EPERM; 668 } 669 nr->user_addr = *source; 670 } 671 672 nr->source_addr = *source; 673 nr->device = dev; 674 675 dev_put(dev); 676 nr_insert_socket(sk); /* Finish the bind */ 677 } 678 679 nr->dest_addr = addr->sax25_call; 680 681 release_sock(sk); 682 circuit = nr_find_next_circuit(); 683 lock_sock(sk); 684 685 nr->my_index = circuit / 256; 686 nr->my_id = circuit % 256; 687 688 circuit++; 689 690 /* Move to connecting socket, start sending Connect Requests */ 691 sock->state = SS_CONNECTING; 692 sk->sk_state = TCP_SYN_SENT; 693 694 nr_establish_data_link(sk); 695 696 nr->state = NR_STATE_1; 697 698 nr_start_heartbeat(sk); 699 700 /* Now the loop */ 701 if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) { 702 release_sock(sk); 703 return -EINPROGRESS; 704 } 705 706 /* 707 * A Connect Ack with Choke or timeout or failed routing will go to 708 * closed. 709 */ 710 if (sk->sk_state == TCP_SYN_SENT) { 711 struct task_struct *tsk = current; 712 DECLARE_WAITQUEUE(wait, tsk); 713 714 add_wait_queue(sk->sk_sleep, &wait); 715 for (;;) { 716 set_current_state(TASK_INTERRUPTIBLE); 717 if (sk->sk_state != TCP_SYN_SENT) 718 break; 719 release_sock(sk); 720 if (!signal_pending(tsk)) { 721 schedule(); 722 lock_sock(sk); 723 continue; 724 } 725 current->state = TASK_RUNNING; 726 remove_wait_queue(sk->sk_sleep, &wait); 727 return -ERESTARTSYS; 728 } 729 current->state = TASK_RUNNING; 730 remove_wait_queue(sk->sk_sleep, &wait); 731 } 732 733 if (sk->sk_state != TCP_ESTABLISHED) { 734 sock->state = SS_UNCONNECTED; 735 release_sock(sk); 736 return sock_error(sk); /* Always set at this point */ 737 } 738 739 sock->state = SS_CONNECTED; 740 release_sock(sk); 741 742 return 0; 743 } 744 745 static int nr_accept(struct socket *sock, struct socket *newsock, int flags) 746 { 747 struct task_struct *tsk = current; 748 DECLARE_WAITQUEUE(wait, tsk); 749 struct sk_buff *skb; 750 struct sock *newsk; 751 struct sock *sk; 752 int err = 0; 753 754 if ((sk = sock->sk) == NULL) 755 return -EINVAL; 756 757 lock_sock(sk); 758 if (sk->sk_type != SOCK_SEQPACKET) { 759 err = -EOPNOTSUPP; 760 goto out; 761 } 762 763 if (sk->sk_state != TCP_LISTEN) { 764 err = -EINVAL; 765 goto out; 766 } 767 768 /* 769 * The write queue this time is holding sockets ready to use 770 * hooked into the SABM we saved 771 */ 772 add_wait_queue(sk->sk_sleep, &wait); 773 for (;;) { 774 skb = skb_dequeue(&sk->sk_receive_queue); 775 if (skb) 776 break; 777 778 current->state = TASK_INTERRUPTIBLE; 779 release_sock(sk); 780 if (flags & O_NONBLOCK) { 781 current->state = TASK_RUNNING; 782 remove_wait_queue(sk->sk_sleep, &wait); 783 return -EWOULDBLOCK; 784 } 785 if (!signal_pending(tsk)) { 786 schedule(); 787 lock_sock(sk); 788 continue; 789 } 790 current->state = TASK_RUNNING; 791 remove_wait_queue(sk->sk_sleep, &wait); 792 return -ERESTARTSYS; 793 } 794 current->state = TASK_RUNNING; 795 remove_wait_queue(sk->sk_sleep, &wait); 796 797 newsk = skb->sk; 798 newsk->sk_socket = newsock; 799 newsk->sk_sleep = &newsock->wait; 800 801 /* Now attach up the new socket */ 802 kfree_skb(skb); 803 sk_acceptq_removed(sk); 804 newsock->sk = newsk; 805 806 out: 807 release_sock(sk); 808 return err; 809 } 810 811 static int nr_getname(struct socket *sock, struct sockaddr *uaddr, 812 int *uaddr_len, int peer) 813 { 814 struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr; 815 struct sock *sk = sock->sk; 816 struct nr_sock *nr = nr_sk(sk); 817 818 lock_sock(sk); 819 if (peer != 0) { 820 if (sk->sk_state != TCP_ESTABLISHED) { 821 release_sock(sk); 822 return -ENOTCONN; 823 } 824 sax->fsa_ax25.sax25_family = AF_NETROM; 825 sax->fsa_ax25.sax25_ndigis = 1; 826 sax->fsa_ax25.sax25_call = nr->user_addr; 827 sax->fsa_digipeater[0] = nr->dest_addr; 828 *uaddr_len = sizeof(struct full_sockaddr_ax25); 829 } else { 830 sax->fsa_ax25.sax25_family = AF_NETROM; 831 sax->fsa_ax25.sax25_ndigis = 0; 832 sax->fsa_ax25.sax25_call = nr->source_addr; 833 *uaddr_len = sizeof(struct sockaddr_ax25); 834 } 835 release_sock(sk); 836 837 return 0; 838 } 839 840 int nr_rx_frame(struct sk_buff *skb, struct net_device *dev) 841 { 842 struct sock *sk; 843 struct sock *make; 844 struct nr_sock *nr_make; 845 ax25_address *src, *dest, *user; 846 unsigned short circuit_index, circuit_id; 847 unsigned short peer_circuit_index, peer_circuit_id; 848 unsigned short frametype, flags, window, timeout; 849 int ret; 850 851 skb->sk = NULL; /* Initially we don't know who it's for */ 852 853 /* 854 * skb->data points to the netrom frame start 855 */ 856 857 src = (ax25_address *)(skb->data + 0); 858 dest = (ax25_address *)(skb->data + 7); 859 860 circuit_index = skb->data[15]; 861 circuit_id = skb->data[16]; 862 peer_circuit_index = skb->data[17]; 863 peer_circuit_id = skb->data[18]; 864 frametype = skb->data[19] & 0x0F; 865 flags = skb->data[19] & 0xF0; 866 867 /* 868 * Check for an incoming IP over NET/ROM frame. 869 */ 870 if (frametype == NR_PROTOEXT && 871 circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) { 872 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN); 873 skb->h.raw = skb->data; 874 875 return nr_rx_ip(skb, dev); 876 } 877 878 /* 879 * Find an existing socket connection, based on circuit ID, if it's 880 * a Connect Request base it on their circuit ID. 881 * 882 * Circuit ID 0/0 is not valid but it could still be a "reset" for a 883 * circuit that no longer exists at the other end ... 884 */ 885 886 sk = NULL; 887 888 if (circuit_index == 0 && circuit_id == 0) { 889 if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG) 890 sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src); 891 } else { 892 if (frametype == NR_CONNREQ) 893 sk = nr_find_peer(circuit_index, circuit_id, src); 894 else 895 sk = nr_find_socket(circuit_index, circuit_id); 896 } 897 898 if (sk != NULL) { 899 skb->h.raw = skb->data; 900 901 if (frametype == NR_CONNACK && skb->len == 22) 902 nr_sk(sk)->bpqext = 1; 903 else 904 nr_sk(sk)->bpqext = 0; 905 906 ret = nr_process_rx_frame(sk, skb); 907 bh_unlock_sock(sk); 908 return ret; 909 } 910 911 /* 912 * Now it should be a CONNREQ. 913 */ 914 if (frametype != NR_CONNREQ) { 915 /* 916 * Here it would be nice to be able to send a reset but 917 * NET/ROM doesn't have one. We've tried to extend the protocol 918 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that 919 * apparently kills BPQ boxes... :-( 920 * So now we try to follow the established behaviour of 921 * G8PZT's Xrouter which is sending packets with command type 7 922 * as an extension of the protocol. 923 */ 924 if (sysctl_netrom_reset_circuit && 925 (frametype != NR_RESET || flags != 0)) 926 nr_transmit_reset(skb, 1); 927 928 return 0; 929 } 930 931 sk = nr_find_listener(dest); 932 933 user = (ax25_address *)(skb->data + 21); 934 935 if (sk == NULL || sk_acceptq_is_full(sk) || 936 (make = nr_make_new(sk)) == NULL) { 937 nr_transmit_refusal(skb, 0); 938 if (sk) 939 bh_unlock_sock(sk); 940 return 0; 941 } 942 943 window = skb->data[20]; 944 945 skb->sk = make; 946 make->sk_state = TCP_ESTABLISHED; 947 948 /* Fill in his circuit details */ 949 nr_make = nr_sk(make); 950 nr_make->source_addr = *dest; 951 nr_make->dest_addr = *src; 952 nr_make->user_addr = *user; 953 954 nr_make->your_index = circuit_index; 955 nr_make->your_id = circuit_id; 956 957 bh_unlock_sock(sk); 958 circuit = nr_find_next_circuit(); 959 bh_lock_sock(sk); 960 961 nr_make->my_index = circuit / 256; 962 nr_make->my_id = circuit % 256; 963 964 circuit++; 965 966 /* Window negotiation */ 967 if (window < nr_make->window) 968 nr_make->window = window; 969 970 /* L4 timeout negotiation */ 971 if (skb->len == 37) { 972 timeout = skb->data[36] * 256 + skb->data[35]; 973 if (timeout * HZ < nr_make->t1) 974 nr_make->t1 = timeout * HZ; 975 nr_make->bpqext = 1; 976 } else { 977 nr_make->bpqext = 0; 978 } 979 980 nr_write_internal(make, NR_CONNACK); 981 982 nr_make->condition = 0x00; 983 nr_make->vs = 0; 984 nr_make->va = 0; 985 nr_make->vr = 0; 986 nr_make->vl = 0; 987 nr_make->state = NR_STATE_3; 988 sk_acceptq_added(sk); 989 990 nr_insert_socket(make); 991 992 skb_queue_head(&sk->sk_receive_queue, skb); 993 994 nr_start_heartbeat(make); 995 nr_start_idletimer(make); 996 997 if (!sock_flag(sk, SOCK_DEAD)) 998 sk->sk_data_ready(sk, skb->len); 999 1000 bh_unlock_sock(sk); 1001 return 1; 1002 } 1003 1004 static int nr_sendmsg(struct kiocb *iocb, struct socket *sock, 1005 struct msghdr *msg, size_t len) 1006 { 1007 struct sock *sk = sock->sk; 1008 struct nr_sock *nr = nr_sk(sk); 1009 struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)msg->msg_name; 1010 int err; 1011 struct sockaddr_ax25 sax; 1012 struct sk_buff *skb; 1013 unsigned char *asmptr; 1014 int size; 1015 1016 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT)) 1017 return -EINVAL; 1018 1019 lock_sock(sk); 1020 if (sock_flag(sk, SOCK_ZAPPED)) { 1021 err = -EADDRNOTAVAIL; 1022 goto out; 1023 } 1024 1025 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1026 send_sig(SIGPIPE, current, 0); 1027 err = -EPIPE; 1028 goto out; 1029 } 1030 1031 if (nr->device == NULL) { 1032 err = -ENETUNREACH; 1033 goto out; 1034 } 1035 1036 if (usax) { 1037 if (msg->msg_namelen < sizeof(sax)) { 1038 err = -EINVAL; 1039 goto out; 1040 } 1041 sax = *usax; 1042 if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) { 1043 err = -EISCONN; 1044 goto out; 1045 } 1046 if (sax.sax25_family != AF_NETROM) { 1047 err = -EINVAL; 1048 goto out; 1049 } 1050 } else { 1051 if (sk->sk_state != TCP_ESTABLISHED) { 1052 err = -ENOTCONN; 1053 goto out; 1054 } 1055 sax.sax25_family = AF_NETROM; 1056 sax.sax25_call = nr->dest_addr; 1057 } 1058 1059 SOCK_DEBUG(sk, "NET/ROM: sendto: Addresses built.\n"); 1060 1061 /* Build a packet */ 1062 SOCK_DEBUG(sk, "NET/ROM: sendto: building packet.\n"); 1063 size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN; 1064 1065 if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL) 1066 goto out; 1067 1068 skb_reserve(skb, size - len); 1069 1070 /* 1071 * Push down the NET/ROM header 1072 */ 1073 1074 asmptr = skb_push(skb, NR_TRANSPORT_LEN); 1075 SOCK_DEBUG(sk, "Building NET/ROM Header.\n"); 1076 1077 /* Build a NET/ROM Transport header */ 1078 1079 *asmptr++ = nr->your_index; 1080 *asmptr++ = nr->your_id; 1081 *asmptr++ = 0; /* To be filled in later */ 1082 *asmptr++ = 0; /* Ditto */ 1083 *asmptr++ = NR_INFO; 1084 SOCK_DEBUG(sk, "Built header.\n"); 1085 1086 /* 1087 * Put the data on the end 1088 */ 1089 1090 skb->h.raw = skb_put(skb, len); 1091 1092 asmptr = skb->h.raw; 1093 SOCK_DEBUG(sk, "NET/ROM: Appending user data\n"); 1094 1095 /* User data follows immediately after the NET/ROM transport header */ 1096 if (memcpy_fromiovec(asmptr, msg->msg_iov, len)) { 1097 kfree_skb(skb); 1098 err = -EFAULT; 1099 goto out; 1100 } 1101 1102 SOCK_DEBUG(sk, "NET/ROM: Transmitting buffer\n"); 1103 1104 if (sk->sk_state != TCP_ESTABLISHED) { 1105 kfree_skb(skb); 1106 err = -ENOTCONN; 1107 goto out; 1108 } 1109 1110 nr_output(sk, skb); /* Shove it onto the queue */ 1111 1112 err = len; 1113 out: 1114 release_sock(sk); 1115 return err; 1116 } 1117 1118 static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, 1119 struct msghdr *msg, size_t size, int flags) 1120 { 1121 struct sock *sk = sock->sk; 1122 struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)msg->msg_name; 1123 size_t copied; 1124 struct sk_buff *skb; 1125 int er; 1126 1127 /* 1128 * This works for seqpacket too. The receiver has ordered the queue for 1129 * us! We do one quick check first though 1130 */ 1131 1132 lock_sock(sk); 1133 if (sk->sk_state != TCP_ESTABLISHED) { 1134 release_sock(sk); 1135 return -ENOTCONN; 1136 } 1137 1138 /* Now we can treat all alike */ 1139 if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) { 1140 release_sock(sk); 1141 return er; 1142 } 1143 1144 skb->h.raw = skb->data; 1145 copied = skb->len; 1146 1147 if (copied > size) { 1148 copied = size; 1149 msg->msg_flags |= MSG_TRUNC; 1150 } 1151 1152 skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 1153 1154 if (sax != NULL) { 1155 sax->sax25_family = AF_NETROM; 1156 memcpy(sax->sax25_call.ax25_call, skb->data + 7, AX25_ADDR_LEN); 1157 } 1158 1159 msg->msg_namelen = sizeof(*sax); 1160 1161 skb_free_datagram(sk, skb); 1162 1163 release_sock(sk); 1164 return copied; 1165 } 1166 1167 1168 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1169 { 1170 struct sock *sk = sock->sk; 1171 void __user *argp = (void __user *)arg; 1172 int ret; 1173 1174 switch (cmd) { 1175 case TIOCOUTQ: { 1176 long amount; 1177 1178 lock_sock(sk); 1179 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 1180 if (amount < 0) 1181 amount = 0; 1182 release_sock(sk); 1183 return put_user(amount, (int __user *)argp); 1184 } 1185 1186 case TIOCINQ: { 1187 struct sk_buff *skb; 1188 long amount = 0L; 1189 1190 lock_sock(sk); 1191 /* These two are safe on a single CPU system as only user tasks fiddle here */ 1192 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) 1193 amount = skb->len; 1194 release_sock(sk); 1195 return put_user(amount, (int __user *)argp); 1196 } 1197 1198 case SIOCGSTAMP: 1199 lock_sock(sk); 1200 ret = sock_get_timestamp(sk, argp); 1201 release_sock(sk); 1202 return ret; 1203 1204 case SIOCGIFADDR: 1205 case SIOCSIFADDR: 1206 case SIOCGIFDSTADDR: 1207 case SIOCSIFDSTADDR: 1208 case SIOCGIFBRDADDR: 1209 case SIOCSIFBRDADDR: 1210 case SIOCGIFNETMASK: 1211 case SIOCSIFNETMASK: 1212 case SIOCGIFMETRIC: 1213 case SIOCSIFMETRIC: 1214 return -EINVAL; 1215 1216 case SIOCADDRT: 1217 case SIOCDELRT: 1218 case SIOCNRDECOBS: 1219 if (!capable(CAP_NET_ADMIN)) return -EPERM; 1220 return nr_rt_ioctl(cmd, argp); 1221 1222 default: 1223 return -ENOIOCTLCMD; 1224 } 1225 1226 return 0; 1227 } 1228 1229 #ifdef CONFIG_PROC_FS 1230 1231 static void *nr_info_start(struct seq_file *seq, loff_t *pos) 1232 { 1233 struct sock *s; 1234 struct hlist_node *node; 1235 int i = 1; 1236 1237 spin_lock_bh(&nr_list_lock); 1238 if (*pos == 0) 1239 return SEQ_START_TOKEN; 1240 1241 sk_for_each(s, node, &nr_list) { 1242 if (i == *pos) 1243 return s; 1244 ++i; 1245 } 1246 return NULL; 1247 } 1248 1249 static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos) 1250 { 1251 ++*pos; 1252 1253 return (v == SEQ_START_TOKEN) ? sk_head(&nr_list) 1254 : sk_next((struct sock *)v); 1255 } 1256 1257 static void nr_info_stop(struct seq_file *seq, void *v) 1258 { 1259 spin_unlock_bh(&nr_list_lock); 1260 } 1261 1262 static int nr_info_show(struct seq_file *seq, void *v) 1263 { 1264 struct sock *s = v; 1265 struct net_device *dev; 1266 struct nr_sock *nr; 1267 const char *devname; 1268 char buf[11]; 1269 1270 if (v == SEQ_START_TOKEN) 1271 seq_puts(seq, 1272 "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"); 1273 1274 else { 1275 1276 bh_lock_sock(s); 1277 nr = nr_sk(s); 1278 1279 if ((dev = nr->device) == NULL) 1280 devname = "???"; 1281 else 1282 devname = dev->name; 1283 1284 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr)); 1285 seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr)); 1286 seq_printf(seq, 1287 "%-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", 1288 ax2asc(buf, &nr->source_addr), 1289 devname, 1290 nr->my_index, 1291 nr->my_id, 1292 nr->your_index, 1293 nr->your_id, 1294 nr->state, 1295 nr->vs, 1296 nr->vr, 1297 nr->va, 1298 ax25_display_timer(&nr->t1timer) / HZ, 1299 nr->t1 / HZ, 1300 ax25_display_timer(&nr->t2timer) / HZ, 1301 nr->t2 / HZ, 1302 ax25_display_timer(&nr->t4timer) / HZ, 1303 nr->t4 / HZ, 1304 ax25_display_timer(&nr->idletimer) / (60 * HZ), 1305 nr->idle / (60 * HZ), 1306 nr->n2count, 1307 nr->n2, 1308 nr->window, 1309 atomic_read(&s->sk_wmem_alloc), 1310 atomic_read(&s->sk_rmem_alloc), 1311 s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L); 1312 1313 bh_unlock_sock(s); 1314 } 1315 return 0; 1316 } 1317 1318 static struct seq_operations nr_info_seqops = { 1319 .start = nr_info_start, 1320 .next = nr_info_next, 1321 .stop = nr_info_stop, 1322 .show = nr_info_show, 1323 }; 1324 1325 static int nr_info_open(struct inode *inode, struct file *file) 1326 { 1327 return seq_open(file, &nr_info_seqops); 1328 } 1329 1330 static struct file_operations nr_info_fops = { 1331 .owner = THIS_MODULE, 1332 .open = nr_info_open, 1333 .read = seq_read, 1334 .llseek = seq_lseek, 1335 .release = seq_release, 1336 }; 1337 #endif /* CONFIG_PROC_FS */ 1338 1339 static struct net_proto_family nr_family_ops = { 1340 .family = PF_NETROM, 1341 .create = nr_create, 1342 .owner = THIS_MODULE, 1343 }; 1344 1345 static const struct proto_ops nr_proto_ops = { 1346 .family = PF_NETROM, 1347 .owner = THIS_MODULE, 1348 .release = nr_release, 1349 .bind = nr_bind, 1350 .connect = nr_connect, 1351 .socketpair = sock_no_socketpair, 1352 .accept = nr_accept, 1353 .getname = nr_getname, 1354 .poll = datagram_poll, 1355 .ioctl = nr_ioctl, 1356 .listen = nr_listen, 1357 .shutdown = sock_no_shutdown, 1358 .setsockopt = nr_setsockopt, 1359 .getsockopt = nr_getsockopt, 1360 .sendmsg = nr_sendmsg, 1361 .recvmsg = nr_recvmsg, 1362 .mmap = sock_no_mmap, 1363 .sendpage = sock_no_sendpage, 1364 }; 1365 1366 static struct notifier_block nr_dev_notifier = { 1367 .notifier_call = nr_device_event, 1368 }; 1369 1370 static struct net_device **dev_nr; 1371 1372 static int __init nr_proto_init(void) 1373 { 1374 int i; 1375 int rc = proto_register(&nr_proto, 0); 1376 1377 if (rc != 0) 1378 goto out; 1379 1380 if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) { 1381 printk(KERN_ERR "NET/ROM: nr_proto_init - nr_ndevs parameter to large\n"); 1382 return -1; 1383 } 1384 1385 dev_nr = kzalloc(nr_ndevs * sizeof(struct net_device *), GFP_KERNEL); 1386 if (dev_nr == NULL) { 1387 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device array\n"); 1388 return -1; 1389 } 1390 1391 for (i = 0; i < nr_ndevs; i++) { 1392 char name[IFNAMSIZ]; 1393 struct net_device *dev; 1394 1395 sprintf(name, "nr%d", i); 1396 dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup); 1397 if (!dev) { 1398 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n"); 1399 goto fail; 1400 } 1401 1402 dev->base_addr = i; 1403 if (register_netdev(dev)) { 1404 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register network device\n"); 1405 free_netdev(dev); 1406 goto fail; 1407 } 1408 dev_nr[i] = dev; 1409 } 1410 1411 if (sock_register(&nr_family_ops)) { 1412 printk(KERN_ERR "NET/ROM: nr_proto_init - unable to register socket family\n"); 1413 goto fail; 1414 } 1415 1416 register_netdevice_notifier(&nr_dev_notifier); 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