linux/net/netrom/af_netrom.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *
   4 * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   5 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
   6 * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)
   7 */
   8#include <linux/module.h>
   9#include <linux/moduleparam.h>
  10#include <linux/capability.h>
  11#include <linux/errno.h>
  12#include <linux/types.h>
  13#include <linux/socket.h>
  14#include <linux/in.h>
  15#include <linux/slab.h>
  16#include <linux/kernel.h>
  17#include <linux/sched/signal.h>
  18#include <linux/timer.h>
  19#include <linux/string.h>
  20#include <linux/sockios.h>
  21#include <linux/net.h>
  22#include <linux/stat.h>
  23#include <net/ax25.h>
  24#include <linux/inet.h>
  25#include <linux/netdevice.h>
  26#include <linux/if_arp.h>
  27#include <linux/skbuff.h>
  28#include <net/net_namespace.h>
  29#include <net/sock.h>
  30#include <linux/uaccess.h>
  31#include <linux/fcntl.h>
  32#include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  33#include <linux/mm.h>
  34#include <linux/interrupt.h>
  35#include <linux/notifier.h>
  36#include <net/netrom.h>
  37#include <linux/proc_fs.h>
  38#include <linux/seq_file.h>
  39#include <net/ip.h>
  40#include <net/tcp_states.h>
  41#include <net/arp.h>
  42#include <linux/init.h>
  43
  44static int nr_ndevs = 4;
  45
  46int sysctl_netrom_default_path_quality            = NR_DEFAULT_QUAL;
  47int sysctl_netrom_obsolescence_count_initialiser  = NR_DEFAULT_OBS;
  48int sysctl_netrom_network_ttl_initialiser         = NR_DEFAULT_TTL;
  49int sysctl_netrom_transport_timeout               = NR_DEFAULT_T1;
  50int sysctl_netrom_transport_maximum_tries         = NR_DEFAULT_N2;
  51int sysctl_netrom_transport_acknowledge_delay     = NR_DEFAULT_T2;
  52int sysctl_netrom_transport_busy_delay            = NR_DEFAULT_T4;
  53int sysctl_netrom_transport_requested_window_size = NR_DEFAULT_WINDOW;
  54int sysctl_netrom_transport_no_activity_timeout   = NR_DEFAULT_IDLE;
  55int sysctl_netrom_routing_control                 = NR_DEFAULT_ROUTING;
  56int sysctl_netrom_link_fails_count                = NR_DEFAULT_FAILS;
  57int sysctl_netrom_reset_circuit                   = NR_DEFAULT_RESET;
  58
  59static unsigned short circuit = 0x101;
  60
  61static HLIST_HEAD(nr_list);
  62static DEFINE_SPINLOCK(nr_list_lock);
  63
  64static const struct proto_ops nr_proto_ops;
  65
  66/*
  67 * NETROM network devices are virtual network devices encapsulating NETROM
  68 * frames into AX.25 which will be sent through an AX.25 device, so form a
  69 * special "super class" of normal net devices; split their locks off into a
  70 * separate class since they always nest.
  71 */
  72static struct lock_class_key nr_netdev_xmit_lock_key;
  73static struct lock_class_key nr_netdev_addr_lock_key;
  74
  75static void nr_set_lockdep_one(struct net_device *dev,
  76                               struct netdev_queue *txq,
  77                               void *_unused)
  78{
  79        lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
  80}
  81
  82static void nr_set_lockdep_key(struct net_device *dev)
  83{
  84        lockdep_set_class(&dev->addr_list_lock, &nr_netdev_addr_lock_key);
  85        netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL);
  86}
  87
  88/*
  89 *      Socket removal during an interrupt is now safe.
  90 */
  91static void nr_remove_socket(struct sock *sk)
  92{
  93        spin_lock_bh(&nr_list_lock);
  94        sk_del_node_init(sk);
  95        spin_unlock_bh(&nr_list_lock);
  96}
  97
  98/*
  99 *      Kill all bound sockets on a dropped device.
 100 */
 101static void nr_kill_by_device(struct net_device *dev)
 102{
 103        struct sock *s;
 104
 105        spin_lock_bh(&nr_list_lock);
 106        sk_for_each(s, &nr_list)
 107                if (nr_sk(s)->device == dev)
 108                        nr_disconnect(s, ENETUNREACH);
 109        spin_unlock_bh(&nr_list_lock);
 110}
 111
 112/*
 113 *      Handle device status changes.
 114 */
 115static int nr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
 116{
 117        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 118
 119        if (!net_eq(dev_net(dev), &init_net))
 120                return NOTIFY_DONE;
 121
 122        if (event != NETDEV_DOWN)
 123                return NOTIFY_DONE;
 124
 125        nr_kill_by_device(dev);
 126        nr_rt_device_down(dev);
 127
 128        return NOTIFY_DONE;
 129}
 130
 131/*
 132 *      Add a socket to the bound sockets list.
 133 */
 134static void nr_insert_socket(struct sock *sk)
 135{
 136        spin_lock_bh(&nr_list_lock);
 137        sk_add_node(sk, &nr_list);
 138        spin_unlock_bh(&nr_list_lock);
 139}
 140
 141/*
 142 *      Find a socket that wants to accept the Connect Request we just
 143 *      received.
 144 */
 145static struct sock *nr_find_listener(ax25_address *addr)
 146{
 147        struct sock *s;
 148
 149        spin_lock_bh(&nr_list_lock);
 150        sk_for_each(s, &nr_list)
 151                if (!ax25cmp(&nr_sk(s)->source_addr, addr) &&
 152                    s->sk_state == TCP_LISTEN) {
 153                        sock_hold(s);
 154                        goto found;
 155                }
 156        s = NULL;
 157found:
 158        spin_unlock_bh(&nr_list_lock);
 159        return s;
 160}
 161
 162/*
 163 *      Find a connected NET/ROM socket given my circuit IDs.
 164 */
 165static struct sock *nr_find_socket(unsigned char index, unsigned char id)
 166{
 167        struct sock *s;
 168
 169        spin_lock_bh(&nr_list_lock);
 170        sk_for_each(s, &nr_list) {
 171                struct nr_sock *nr = nr_sk(s);
 172
 173                if (nr->my_index == index && nr->my_id == id) {
 174                        sock_hold(s);
 175                        goto found;
 176                }
 177        }
 178        s = NULL;
 179found:
 180        spin_unlock_bh(&nr_list_lock);
 181        return s;
 182}
 183
 184/*
 185 *      Find a connected NET/ROM socket given their circuit IDs.
 186 */
 187static struct sock *nr_find_peer(unsigned char index, unsigned char id,
 188        ax25_address *dest)
 189{
 190        struct sock *s;
 191
 192        spin_lock_bh(&nr_list_lock);
 193        sk_for_each(s, &nr_list) {
 194                struct nr_sock *nr = nr_sk(s);
 195
 196                if (nr->your_index == index && nr->your_id == id &&
 197                    !ax25cmp(&nr->dest_addr, dest)) {
 198                        sock_hold(s);
 199                        goto found;
 200                }
 201        }
 202        s = NULL;
 203found:
 204        spin_unlock_bh(&nr_list_lock);
 205        return s;
 206}
 207
 208/*
 209 *      Find next free circuit ID.
 210 */
 211static unsigned short nr_find_next_circuit(void)
 212{
 213        unsigned short id = circuit;
 214        unsigned char i, j;
 215        struct sock *sk;
 216
 217        for (;;) {
 218                i = id / 256;
 219                j = id % 256;
 220
 221                if (i != 0 && j != 0) {
 222                        if ((sk=nr_find_socket(i, j)) == NULL)
 223                                break;
 224                        sock_put(sk);
 225                }
 226
 227                id++;
 228        }
 229
 230        return id;
 231}
 232
 233/*
 234 *      Deferred destroy.
 235 */
 236void nr_destroy_socket(struct sock *);
 237
 238/*
 239 *      Handler for deferred kills.
 240 */
 241static void nr_destroy_timer(struct timer_list *t)
 242{
 243        struct sock *sk = from_timer(sk, t, sk_timer);
 244        bh_lock_sock(sk);
 245        sock_hold(sk);
 246        nr_destroy_socket(sk);
 247        bh_unlock_sock(sk);
 248        sock_put(sk);
 249}
 250
 251/*
 252 *      This is called from user mode and the timers. Thus it protects itself
 253 *      against interrupt users but doesn't worry about being called during
 254 *      work. Once it is removed from the queue no interrupt or bottom half
 255 *      will touch it and we are (fairly 8-) ) safe.
 256 */
 257void nr_destroy_socket(struct sock *sk)
 258{
 259        struct sk_buff *skb;
 260
 261        nr_remove_socket(sk);
 262
 263        nr_stop_heartbeat(sk);
 264        nr_stop_t1timer(sk);
 265        nr_stop_t2timer(sk);
 266        nr_stop_t4timer(sk);
 267        nr_stop_idletimer(sk);
 268
 269        nr_clear_queues(sk);            /* Flush the queues */
 270
 271        while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 272                if (skb->sk != sk) { /* A pending connection */
 273                        /* Queue the unaccepted socket for death */
 274                        sock_set_flag(skb->sk, SOCK_DEAD);
 275                        nr_start_heartbeat(skb->sk);
 276                        nr_sk(skb->sk)->state = NR_STATE_0;
 277                }
 278
 279                kfree_skb(skb);
 280        }
 281
 282        if (sk_has_allocations(sk)) {
 283                /* Defer: outstanding buffers */
 284                sk->sk_timer.function = nr_destroy_timer;
 285                sk->sk_timer.expires  = jiffies + 2 * HZ;
 286                add_timer(&sk->sk_timer);
 287        } else
 288                sock_put(sk);
 289}
 290
 291/*
 292 *      Handling for system calls applied via the various interfaces to a
 293 *      NET/ROM socket object.
 294 */
 295
 296static int nr_setsockopt(struct socket *sock, int level, int optname,
 297                sockptr_t optval, unsigned int optlen)
 298{
 299        struct sock *sk = sock->sk;
 300        struct nr_sock *nr = nr_sk(sk);
 301        unsigned int opt;
 302
 303        if (level != SOL_NETROM)
 304                return -ENOPROTOOPT;
 305
 306        if (optlen < sizeof(unsigned int))
 307                return -EINVAL;
 308
 309        if (copy_from_sockptr(&opt, optval, sizeof(opt)))
 310                return -EFAULT;
 311
 312        switch (optname) {
 313        case NETROM_T1:
 314                if (opt < 1 || opt > UINT_MAX / HZ)
 315                        return -EINVAL;
 316                nr->t1 = opt * HZ;
 317                return 0;
 318
 319        case NETROM_T2:
 320                if (opt < 1 || opt > UINT_MAX / HZ)
 321                        return -EINVAL;
 322                nr->t2 = opt * HZ;
 323                return 0;
 324
 325        case NETROM_N2:
 326                if (opt < 1 || opt > 31)
 327                        return -EINVAL;
 328                nr->n2 = opt;
 329                return 0;
 330
 331        case NETROM_T4:
 332                if (opt < 1 || opt > UINT_MAX / HZ)
 333                        return -EINVAL;
 334                nr->t4 = opt * HZ;
 335                return 0;
 336
 337        case NETROM_IDLE:
 338                if (opt > UINT_MAX / (60 * HZ))
 339                        return -EINVAL;
 340                nr->idle = opt * 60 * HZ;
 341                return 0;
 342
 343        default:
 344                return -ENOPROTOOPT;
 345        }
 346}
 347
 348static int nr_getsockopt(struct socket *sock, int level, int optname,
 349        char __user *optval, int __user *optlen)
 350{
 351        struct sock *sk = sock->sk;
 352        struct nr_sock *nr = nr_sk(sk);
 353        int val = 0;
 354        int len;
 355
 356        if (level != SOL_NETROM)
 357                return -ENOPROTOOPT;
 358
 359        if (get_user(len, optlen))
 360                return -EFAULT;
 361
 362        if (len < 0)
 363                return -EINVAL;
 364
 365        switch (optname) {
 366        case NETROM_T1:
 367                val = nr->t1 / HZ;
 368                break;
 369
 370        case NETROM_T2:
 371                val = nr->t2 / HZ;
 372                break;
 373
 374        case NETROM_N2:
 375                val = nr->n2;
 376                break;
 377
 378        case NETROM_T4:
 379                val = nr->t4 / HZ;
 380                break;
 381
 382        case NETROM_IDLE:
 383                val = nr->idle / (60 * HZ);
 384                break;
 385
 386        default:
 387                return -ENOPROTOOPT;
 388        }
 389
 390        len = min_t(unsigned int, len, sizeof(int));
 391
 392        if (put_user(len, optlen))
 393                return -EFAULT;
 394
 395        return copy_to_user(optval, &val, len) ? -EFAULT : 0;
 396}
 397
 398static int nr_listen(struct socket *sock, int backlog)
 399{
 400        struct sock *sk = sock->sk;
 401
 402        lock_sock(sk);
 403        if (sk->sk_state != TCP_LISTEN) {
 404                memset(&nr_sk(sk)->user_addr, 0, AX25_ADDR_LEN);
 405                sk->sk_max_ack_backlog = backlog;
 406                sk->sk_state           = TCP_LISTEN;
 407                release_sock(sk);
 408                return 0;
 409        }
 410        release_sock(sk);
 411
 412        return -EOPNOTSUPP;
 413}
 414
 415static struct proto nr_proto = {
 416        .name     = "NETROM",
 417        .owner    = THIS_MODULE,
 418        .obj_size = sizeof(struct nr_sock),
 419};
 420
 421static int nr_create(struct net *net, struct socket *sock, int protocol,
 422                     int kern)
 423{
 424        struct sock *sk;
 425        struct nr_sock *nr;
 426
 427        if (!net_eq(net, &init_net))
 428                return -EAFNOSUPPORT;
 429
 430        if (sock->type != SOCK_SEQPACKET || protocol != 0)
 431                return -ESOCKTNOSUPPORT;
 432
 433        sk = sk_alloc(net, PF_NETROM, GFP_ATOMIC, &nr_proto, kern);
 434        if (sk  == NULL)
 435                return -ENOMEM;
 436
 437        nr = nr_sk(sk);
 438
 439        sock_init_data(sock, sk);
 440
 441        sock->ops    = &nr_proto_ops;
 442        sk->sk_protocol = protocol;
 443
 444        skb_queue_head_init(&nr->ack_queue);
 445        skb_queue_head_init(&nr->reseq_queue);
 446        skb_queue_head_init(&nr->frag_queue);
 447
 448        nr_init_timers(sk);
 449
 450        nr->t1     =
 451                msecs_to_jiffies(sysctl_netrom_transport_timeout);
 452        nr->t2     =
 453                msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
 454        nr->n2     =
 455                msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
 456        nr->t4     =
 457                msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
 458        nr->idle   =
 459                msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
 460        nr->window = sysctl_netrom_transport_requested_window_size;
 461
 462        nr->bpqext = 1;
 463        nr->state  = NR_STATE_0;
 464
 465        return 0;
 466}
 467
 468static struct sock *nr_make_new(struct sock *osk)
 469{
 470        struct sock *sk;
 471        struct nr_sock *nr, *onr;
 472
 473        if (osk->sk_type != SOCK_SEQPACKET)
 474                return NULL;
 475
 476        sk = sk_alloc(sock_net(osk), PF_NETROM, GFP_ATOMIC, osk->sk_prot, 0);
 477        if (sk == NULL)
 478                return NULL;
 479
 480        nr = nr_sk(sk);
 481
 482        sock_init_data(NULL, sk);
 483
 484        sk->sk_type     = osk->sk_type;
 485        sk->sk_priority = osk->sk_priority;
 486        sk->sk_protocol = osk->sk_protocol;
 487        sk->sk_rcvbuf   = osk->sk_rcvbuf;
 488        sk->sk_sndbuf   = osk->sk_sndbuf;
 489        sk->sk_state    = TCP_ESTABLISHED;
 490        sock_copy_flags(sk, osk);
 491
 492        skb_queue_head_init(&nr->ack_queue);
 493        skb_queue_head_init(&nr->reseq_queue);
 494        skb_queue_head_init(&nr->frag_queue);
 495
 496        nr_init_timers(sk);
 497
 498        onr = nr_sk(osk);
 499
 500        nr->t1      = onr->t1;
 501        nr->t2      = onr->t2;
 502        nr->n2      = onr->n2;
 503        nr->t4      = onr->t4;
 504        nr->idle    = onr->idle;
 505        nr->window  = onr->window;
 506
 507        nr->device  = onr->device;
 508        nr->bpqext  = onr->bpqext;
 509
 510        return sk;
 511}
 512
 513static int nr_release(struct socket *sock)
 514{
 515        struct sock *sk = sock->sk;
 516        struct nr_sock *nr;
 517
 518        if (sk == NULL) return 0;
 519
 520        sock_hold(sk);
 521        sock_orphan(sk);
 522        lock_sock(sk);
 523        nr = nr_sk(sk);
 524
 525        switch (nr->state) {
 526        case NR_STATE_0:
 527        case NR_STATE_1:
 528        case NR_STATE_2:
 529                nr_disconnect(sk, 0);
 530                nr_destroy_socket(sk);
 531                break;
 532
 533        case NR_STATE_3:
 534                nr_clear_queues(sk);
 535                nr->n2count = 0;
 536                nr_write_internal(sk, NR_DISCREQ);
 537                nr_start_t1timer(sk);
 538                nr_stop_t2timer(sk);
 539                nr_stop_t4timer(sk);
 540                nr_stop_idletimer(sk);
 541                nr->state    = NR_STATE_2;
 542                sk->sk_state    = TCP_CLOSE;
 543                sk->sk_shutdown |= SEND_SHUTDOWN;
 544                sk->sk_state_change(sk);
 545                sock_set_flag(sk, SOCK_DESTROY);
 546                break;
 547
 548        default:
 549                break;
 550        }
 551
 552        sock->sk   = NULL;
 553        release_sock(sk);
 554        sock_put(sk);
 555
 556        return 0;
 557}
 558
 559static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 560{
 561        struct sock *sk = sock->sk;
 562        struct nr_sock *nr = nr_sk(sk);
 563        struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
 564        struct net_device *dev;
 565        ax25_uid_assoc *user;
 566        ax25_address *source;
 567
 568        lock_sock(sk);
 569        if (!sock_flag(sk, SOCK_ZAPPED)) {
 570                release_sock(sk);
 571                return -EINVAL;
 572        }
 573        if (addr_len < sizeof(struct sockaddr_ax25) || addr_len > sizeof(struct full_sockaddr_ax25)) {
 574                release_sock(sk);
 575                return -EINVAL;
 576        }
 577        if (addr_len < (addr->fsa_ax25.sax25_ndigis * sizeof(ax25_address) + sizeof(struct sockaddr_ax25))) {
 578                release_sock(sk);
 579                return -EINVAL;
 580        }
 581        if (addr->fsa_ax25.sax25_family != AF_NETROM) {
 582                release_sock(sk);
 583                return -EINVAL;
 584        }
 585        if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
 586                release_sock(sk);
 587                return -EADDRNOTAVAIL;
 588        }
 589
 590        /*
 591         * Only the super user can set an arbitrary user callsign.
 592         */
 593        if (addr->fsa_ax25.sax25_ndigis == 1) {
 594                if (!capable(CAP_NET_BIND_SERVICE)) {
 595                        dev_put(dev);
 596                        release_sock(sk);
 597                        return -EPERM;
 598                }
 599                nr->user_addr   = addr->fsa_digipeater[0];
 600                nr->source_addr = addr->fsa_ax25.sax25_call;
 601        } else {
 602                source = &addr->fsa_ax25.sax25_call;
 603
 604                user = ax25_findbyuid(current_euid());
 605                if (user) {
 606                        nr->user_addr   = user->call;
 607                        ax25_uid_put(user);
 608                } else {
 609                        if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
 610                                release_sock(sk);
 611                                dev_put(dev);
 612                                return -EPERM;
 613                        }
 614                        nr->user_addr   = *source;
 615                }
 616
 617                nr->source_addr = *source;
 618        }
 619
 620        nr->device = dev;
 621        nr_insert_socket(sk);
 622
 623        sock_reset_flag(sk, SOCK_ZAPPED);
 624        dev_put(dev);
 625        release_sock(sk);
 626
 627        return 0;
 628}
 629
 630static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
 631        int addr_len, int flags)
 632{
 633        struct sock *sk = sock->sk;
 634        struct nr_sock *nr = nr_sk(sk);
 635        struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
 636        const ax25_address *source = NULL;
 637        ax25_uid_assoc *user;
 638        struct net_device *dev;
 639        int err = 0;
 640
 641        lock_sock(sk);
 642        if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 643                sock->state = SS_CONNECTED;
 644                goto out_release;       /* Connect completed during a ERESTARTSYS event */
 645        }
 646
 647        if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 648                sock->state = SS_UNCONNECTED;
 649                err = -ECONNREFUSED;
 650                goto out_release;
 651        }
 652
 653        if (sk->sk_state == TCP_ESTABLISHED) {
 654                err = -EISCONN; /* No reconnect on a seqpacket socket */
 655                goto out_release;
 656        }
 657
 658        sk->sk_state   = TCP_CLOSE;
 659        sock->state = SS_UNCONNECTED;
 660
 661        if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25)) {
 662                err = -EINVAL;
 663                goto out_release;
 664        }
 665        if (addr->sax25_family != AF_NETROM) {
 666                err = -EINVAL;
 667                goto out_release;
 668        }
 669        if (sock_flag(sk, SOCK_ZAPPED)) {       /* Must bind first - autobinding in this may or may not work */
 670                sock_reset_flag(sk, SOCK_ZAPPED);
 671
 672                if ((dev = nr_dev_first()) == NULL) {
 673                        err = -ENETUNREACH;
 674                        goto out_release;
 675                }
 676                source = (const ax25_address *)dev->dev_addr;
 677
 678                user = ax25_findbyuid(current_euid());
 679                if (user) {
 680                        nr->user_addr   = user->call;
 681                        ax25_uid_put(user);
 682                } else {
 683                        if (ax25_uid_policy && !capable(CAP_NET_ADMIN)) {
 684                                dev_put(dev);
 685                                err = -EPERM;
 686                                goto out_release;
 687                        }
 688                        nr->user_addr   = *source;
 689                }
 690
 691                nr->source_addr = *source;
 692                nr->device      = dev;
 693
 694                dev_put(dev);
 695                nr_insert_socket(sk);           /* Finish the bind */
 696        }
 697
 698        nr->dest_addr = addr->sax25_call;
 699
 700        release_sock(sk);
 701        circuit = nr_find_next_circuit();
 702        lock_sock(sk);
 703
 704        nr->my_index = circuit / 256;
 705        nr->my_id    = circuit % 256;
 706
 707        circuit++;
 708
 709        /* Move to connecting socket, start sending Connect Requests */
 710        sock->state  = SS_CONNECTING;
 711        sk->sk_state = TCP_SYN_SENT;
 712
 713        nr_establish_data_link(sk);
 714
 715        nr->state = NR_STATE_1;
 716
 717        nr_start_heartbeat(sk);
 718
 719        /* Now the loop */
 720        if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
 721                err = -EINPROGRESS;
 722                goto out_release;
 723        }
 724
 725        /*
 726         * A Connect Ack with Choke or timeout or failed routing will go to
 727         * closed.
 728         */
 729        if (sk->sk_state == TCP_SYN_SENT) {
 730                DEFINE_WAIT(wait);
 731
 732                for (;;) {
 733                        prepare_to_wait(sk_sleep(sk), &wait,
 734                                        TASK_INTERRUPTIBLE);
 735                        if (sk->sk_state != TCP_SYN_SENT)
 736                                break;
 737                        if (!signal_pending(current)) {
 738                                release_sock(sk);
 739                                schedule();
 740                                lock_sock(sk);
 741                                continue;
 742                        }
 743                        err = -ERESTARTSYS;
 744                        break;
 745                }
 746                finish_wait(sk_sleep(sk), &wait);
 747                if (err)
 748                        goto out_release;
 749        }
 750
 751        if (sk->sk_state != TCP_ESTABLISHED) {
 752                sock->state = SS_UNCONNECTED;
 753                err = sock_error(sk);   /* Always set at this point */
 754                goto out_release;
 755        }
 756
 757        sock->state = SS_CONNECTED;
 758
 759out_release:
 760        release_sock(sk);
 761
 762        return err;
 763}
 764
 765static int nr_accept(struct socket *sock, struct socket *newsock, int flags,
 766                     bool kern)
 767{
 768        struct sk_buff *skb;
 769        struct sock *newsk;
 770        DEFINE_WAIT(wait);
 771        struct sock *sk;
 772        int err = 0;
 773
 774        if ((sk = sock->sk) == NULL)
 775                return -EINVAL;
 776
 777        lock_sock(sk);
 778        if (sk->sk_type != SOCK_SEQPACKET) {
 779                err = -EOPNOTSUPP;
 780                goto out_release;
 781        }
 782
 783        if (sk->sk_state != TCP_LISTEN) {
 784                err = -EINVAL;
 785                goto out_release;
 786        }
 787
 788        /*
 789         *      The write queue this time is holding sockets ready to use
 790         *      hooked into the SABM we saved
 791         */
 792        for (;;) {
 793                prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 794                skb = skb_dequeue(&sk->sk_receive_queue);
 795                if (skb)
 796                        break;
 797
 798                if (flags & O_NONBLOCK) {
 799                        err = -EWOULDBLOCK;
 800                        break;
 801                }
 802                if (!signal_pending(current)) {
 803                        release_sock(sk);
 804                        schedule();
 805                        lock_sock(sk);
 806                        continue;
 807                }
 808                err = -ERESTARTSYS;
 809                break;
 810        }
 811        finish_wait(sk_sleep(sk), &wait);
 812        if (err)
 813                goto out_release;
 814
 815        newsk = skb->sk;
 816        sock_graft(newsk, newsock);
 817
 818        /* Now attach up the new socket */
 819        kfree_skb(skb);
 820        sk_acceptq_removed(sk);
 821
 822out_release:
 823        release_sock(sk);
 824
 825        return err;
 826}
 827
 828static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
 829        int peer)
 830{
 831        struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
 832        struct sock *sk = sock->sk;
 833        struct nr_sock *nr = nr_sk(sk);
 834        int uaddr_len;
 835
 836        memset(&sax->fsa_ax25, 0, sizeof(struct sockaddr_ax25));
 837
 838        lock_sock(sk);
 839        if (peer != 0) {
 840                if (sk->sk_state != TCP_ESTABLISHED) {
 841                        release_sock(sk);
 842                        return -ENOTCONN;
 843                }
 844                sax->fsa_ax25.sax25_family = AF_NETROM;
 845                sax->fsa_ax25.sax25_ndigis = 1;
 846                sax->fsa_ax25.sax25_call   = nr->user_addr;
 847                memset(sax->fsa_digipeater, 0, sizeof(sax->fsa_digipeater));
 848                sax->fsa_digipeater[0]     = nr->dest_addr;
 849                uaddr_len = sizeof(struct full_sockaddr_ax25);
 850        } else {
 851                sax->fsa_ax25.sax25_family = AF_NETROM;
 852                sax->fsa_ax25.sax25_ndigis = 0;
 853                sax->fsa_ax25.sax25_call   = nr->source_addr;
 854                uaddr_len = sizeof(struct sockaddr_ax25);
 855        }
 856        release_sock(sk);
 857
 858        return uaddr_len;
 859}
 860
 861int nr_rx_frame(struct sk_buff *skb, struct net_device *dev)
 862{
 863        struct sock *sk;
 864        struct sock *make;
 865        struct nr_sock *nr_make;
 866        ax25_address *src, *dest, *user;
 867        unsigned short circuit_index, circuit_id;
 868        unsigned short peer_circuit_index, peer_circuit_id;
 869        unsigned short frametype, flags, window, timeout;
 870        int ret;
 871
 872        skb_orphan(skb);
 873
 874        /*
 875         *      skb->data points to the netrom frame start
 876         */
 877
 878        src  = (ax25_address *)(skb->data + 0);
 879        dest = (ax25_address *)(skb->data + 7);
 880
 881        circuit_index      = skb->data[15];
 882        circuit_id         = skb->data[16];
 883        peer_circuit_index = skb->data[17];
 884        peer_circuit_id    = skb->data[18];
 885        frametype          = skb->data[19] & 0x0F;
 886        flags              = skb->data[19] & 0xF0;
 887
 888        /*
 889         * Check for an incoming IP over NET/ROM frame.
 890         */
 891        if (frametype == NR_PROTOEXT &&
 892            circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
 893                skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
 894                skb_reset_transport_header(skb);
 895
 896                return nr_rx_ip(skb, dev);
 897        }
 898
 899        /*
 900         * Find an existing socket connection, based on circuit ID, if it's
 901         * a Connect Request base it on their circuit ID.
 902         *
 903         * Circuit ID 0/0 is not valid but it could still be a "reset" for a
 904         * circuit that no longer exists at the other end ...
 905         */
 906
 907        sk = NULL;
 908
 909        if (circuit_index == 0 && circuit_id == 0) {
 910                if (frametype == NR_CONNACK && flags == NR_CHOKE_FLAG)
 911                        sk = nr_find_peer(peer_circuit_index, peer_circuit_id, src);
 912        } else {
 913                if (frametype == NR_CONNREQ)
 914                        sk = nr_find_peer(circuit_index, circuit_id, src);
 915                else
 916                        sk = nr_find_socket(circuit_index, circuit_id);
 917        }
 918
 919        if (sk != NULL) {
 920                bh_lock_sock(sk);
 921                skb_reset_transport_header(skb);
 922
 923                if (frametype == NR_CONNACK && skb->len == 22)
 924                        nr_sk(sk)->bpqext = 1;
 925                else
 926                        nr_sk(sk)->bpqext = 0;
 927
 928                ret = nr_process_rx_frame(sk, skb);
 929                bh_unlock_sock(sk);
 930                sock_put(sk);
 931                return ret;
 932        }
 933
 934        /*
 935         * Now it should be a CONNREQ.
 936         */
 937        if (frametype != NR_CONNREQ) {
 938                /*
 939                 * Here it would be nice to be able to send a reset but
 940                 * NET/ROM doesn't have one.  We've tried to extend the protocol
 941                 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
 942                 * apparently kills BPQ boxes... :-(
 943                 * So now we try to follow the established behaviour of
 944                 * G8PZT's Xrouter which is sending packets with command type 7
 945                 * as an extension of the protocol.
 946                 */
 947                if (sysctl_netrom_reset_circuit &&
 948                    (frametype != NR_RESET || flags != 0))
 949                        nr_transmit_reset(skb, 1);
 950
 951                return 0;
 952        }
 953
 954        sk = nr_find_listener(dest);
 955
 956        user = (ax25_address *)(skb->data + 21);
 957
 958        if (sk == NULL || sk_acceptq_is_full(sk) ||
 959            (make = nr_make_new(sk)) == NULL) {
 960                nr_transmit_refusal(skb, 0);
 961                if (sk)
 962                        sock_put(sk);
 963                return 0;
 964        }
 965
 966        bh_lock_sock(sk);
 967
 968        window = skb->data[20];
 969
 970        sock_hold(make);
 971        skb->sk             = make;
 972        skb->destructor     = sock_efree;
 973        make->sk_state      = TCP_ESTABLISHED;
 974
 975        /* Fill in his circuit details */
 976        nr_make = nr_sk(make);
 977        nr_make->source_addr = *dest;
 978        nr_make->dest_addr   = *src;
 979        nr_make->user_addr   = *user;
 980
 981        nr_make->your_index  = circuit_index;
 982        nr_make->your_id     = circuit_id;
 983
 984        bh_unlock_sock(sk);
 985        circuit = nr_find_next_circuit();
 986        bh_lock_sock(sk);
 987
 988        nr_make->my_index    = circuit / 256;
 989        nr_make->my_id       = circuit % 256;
 990
 991        circuit++;
 992
 993        /* Window negotiation */
 994        if (window < nr_make->window)
 995                nr_make->window = window;
 996
 997        /* L4 timeout negotiation */
 998        if (skb->len == 37) {
 999                timeout = skb->data[36] * 256 + skb->data[35];
1000                if (timeout * HZ < nr_make->t1)
1001                        nr_make->t1 = timeout * HZ;
1002                nr_make->bpqext = 1;
1003        } else {
1004                nr_make->bpqext = 0;
1005        }
1006
1007        nr_write_internal(make, NR_CONNACK);
1008
1009        nr_make->condition = 0x00;
1010        nr_make->vs        = 0;
1011        nr_make->va        = 0;
1012        nr_make->vr        = 0;
1013        nr_make->vl        = 0;
1014        nr_make->state     = NR_STATE_3;
1015        sk_acceptq_added(sk);
1016        skb_queue_head(&sk->sk_receive_queue, skb);
1017
1018        if (!sock_flag(sk, SOCK_DEAD))
1019                sk->sk_data_ready(sk);
1020
1021        bh_unlock_sock(sk);
1022        sock_put(sk);
1023
1024        nr_insert_socket(make);
1025
1026        nr_start_heartbeat(make);
1027        nr_start_idletimer(make);
1028
1029        return 1;
1030}
1031
1032static int nr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1033{
1034        struct sock *sk = sock->sk;
1035        struct nr_sock *nr = nr_sk(sk);
1036        DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
1037        int err;
1038        struct sockaddr_ax25 sax;
1039        struct sk_buff *skb;
1040        unsigned char *asmptr;
1041        int size;
1042
1043        if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1044                return -EINVAL;
1045
1046        lock_sock(sk);
1047        if (sock_flag(sk, SOCK_ZAPPED)) {
1048                err = -EADDRNOTAVAIL;
1049                goto out;
1050        }
1051
1052        if (sk->sk_shutdown & SEND_SHUTDOWN) {
1053                send_sig(SIGPIPE, current, 0);
1054                err = -EPIPE;
1055                goto out;
1056        }
1057
1058        if (nr->device == NULL) {
1059                err = -ENETUNREACH;
1060                goto out;
1061        }
1062
1063        if (usax) {
1064                if (msg->msg_namelen < sizeof(sax)) {
1065                        err = -EINVAL;
1066                        goto out;
1067                }
1068                sax = *usax;
1069                if (ax25cmp(&nr->dest_addr, &sax.sax25_call) != 0) {
1070                        err = -EISCONN;
1071                        goto out;
1072                }
1073                if (sax.sax25_family != AF_NETROM) {
1074                        err = -EINVAL;
1075                        goto out;
1076                }
1077        } else {
1078                if (sk->sk_state != TCP_ESTABLISHED) {
1079                        err = -ENOTCONN;
1080                        goto out;
1081                }
1082                sax.sax25_family = AF_NETROM;
1083                sax.sax25_call   = nr->dest_addr;
1084        }
1085
1086        /* Build a packet - the conventional user limit is 236 bytes. We can
1087           do ludicrously large NetROM frames but must not overflow */
1088        if (len > 65536) {
1089                err = -EMSGSIZE;
1090                goto out;
1091        }
1092
1093        size = len + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1094
1095        if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1096                goto out;
1097
1098        skb_reserve(skb, size - len);
1099        skb_reset_transport_header(skb);
1100
1101        /*
1102         *      Push down the NET/ROM header
1103         */
1104
1105        asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1106
1107        /* Build a NET/ROM Transport header */
1108
1109        *asmptr++ = nr->your_index;
1110        *asmptr++ = nr->your_id;
1111        *asmptr++ = 0;          /* To be filled in later */
1112        *asmptr++ = 0;          /*      Ditto            */
1113        *asmptr++ = NR_INFO;
1114
1115        /*
1116         *      Put the data on the end
1117         */
1118        skb_put(skb, len);
1119
1120        /* User data follows immediately after the NET/ROM transport header */
1121        if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
1122                kfree_skb(skb);
1123                err = -EFAULT;
1124                goto out;
1125        }
1126
1127        if (sk->sk_state != TCP_ESTABLISHED) {
1128                kfree_skb(skb);
1129                err = -ENOTCONN;
1130                goto out;
1131        }
1132
1133        nr_output(sk, skb);     /* Shove it onto the queue */
1134
1135        err = len;
1136out:
1137        release_sock(sk);
1138        return err;
1139}
1140
1141static int nr_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1142                      int flags)
1143{
1144        struct sock *sk = sock->sk;
1145        DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
1146        size_t copied;
1147        struct sk_buff *skb;
1148        int er;
1149
1150        /*
1151         * This works for seqpacket too. The receiver has ordered the queue for
1152         * us! We do one quick check first though
1153         */
1154
1155        lock_sock(sk);
1156        if (sk->sk_state != TCP_ESTABLISHED) {
1157                release_sock(sk);
1158                return -ENOTCONN;
1159        }
1160
1161        /* Now we can treat all alike */
1162        if ((skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &er)) == NULL) {
1163                release_sock(sk);
1164                return er;
1165        }
1166
1167        skb_reset_transport_header(skb);
1168        copied     = skb->len;
1169
1170        if (copied > size) {
1171                copied = size;
1172                msg->msg_flags |= MSG_TRUNC;
1173        }
1174
1175        er = skb_copy_datagram_msg(skb, 0, msg, copied);
1176        if (er < 0) {
1177                skb_free_datagram(sk, skb);
1178                release_sock(sk);
1179                return er;
1180        }
1181
1182        if (sax != NULL) {
1183                memset(sax, 0, sizeof(*sax));
1184                sax->sax25_family = AF_NETROM;
1185                skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call,
1186                              AX25_ADDR_LEN);
1187                msg->msg_namelen = sizeof(*sax);
1188        }
1189
1190        skb_free_datagram(sk, skb);
1191
1192        release_sock(sk);
1193        return copied;
1194}
1195
1196
1197static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1198{
1199        struct sock *sk = sock->sk;
1200        void __user *argp = (void __user *)arg;
1201
1202        switch (cmd) {
1203        case TIOCOUTQ: {
1204                long amount;
1205
1206                lock_sock(sk);
1207                amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1208                if (amount < 0)
1209                        amount = 0;
1210                release_sock(sk);
1211                return put_user(amount, (int __user *)argp);
1212        }
1213
1214        case TIOCINQ: {
1215                struct sk_buff *skb;
1216                long amount = 0L;
1217
1218                lock_sock(sk);
1219                /* These two are safe on a single CPU system as only user tasks fiddle here */
1220                if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1221                        amount = skb->len;
1222                release_sock(sk);
1223                return put_user(amount, (int __user *)argp);
1224        }
1225
1226        case SIOCGIFADDR:
1227        case SIOCSIFADDR:
1228        case SIOCGIFDSTADDR:
1229        case SIOCSIFDSTADDR:
1230        case SIOCGIFBRDADDR:
1231        case SIOCSIFBRDADDR:
1232        case SIOCGIFNETMASK:
1233        case SIOCSIFNETMASK:
1234        case SIOCGIFMETRIC:
1235        case SIOCSIFMETRIC:
1236                return -EINVAL;
1237
1238        case SIOCADDRT:
1239        case SIOCDELRT:
1240        case SIOCNRDECOBS:
1241                if (!capable(CAP_NET_ADMIN))
1242                        return -EPERM;
1243                return nr_rt_ioctl(cmd, argp);
1244
1245        default:
1246                return -ENOIOCTLCMD;
1247        }
1248
1249        return 0;
1250}
1251
1252#ifdef CONFIG_PROC_FS
1253
1254static void *nr_info_start(struct seq_file *seq, loff_t *pos)
1255        __acquires(&nr_list_lock)
1256{
1257        spin_lock_bh(&nr_list_lock);
1258        return seq_hlist_start_head(&nr_list, *pos);
1259}
1260
1261static void *nr_info_next(struct seq_file *seq, void *v, loff_t *pos)
1262{
1263        return seq_hlist_next(v, &nr_list, pos);
1264}
1265
1266static void nr_info_stop(struct seq_file *seq, void *v)
1267        __releases(&nr_list_lock)
1268{
1269        spin_unlock_bh(&nr_list_lock);
1270}
1271
1272static int nr_info_show(struct seq_file *seq, void *v)
1273{
1274        struct sock *s = sk_entry(v);
1275        struct net_device *dev;
1276        struct nr_sock *nr;
1277        const char *devname;
1278        char buf[11];
1279
1280        if (v == SEQ_START_TOKEN)
1281                seq_puts(seq,
1282"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");
1283
1284        else {
1285
1286                bh_lock_sock(s);
1287                nr = nr_sk(s);
1288
1289                if ((dev = nr->device) == NULL)
1290                        devname = "???";
1291                else
1292                        devname = dev->name;
1293
1294                seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
1295                seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
1296                seq_printf(seq,
1297"%-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",
1298                        ax2asc(buf, &nr->source_addr),
1299                        devname,
1300                        nr->my_index,
1301                        nr->my_id,
1302                        nr->your_index,
1303                        nr->your_id,
1304                        nr->state,
1305                        nr->vs,
1306                        nr->vr,
1307                        nr->va,
1308                        ax25_display_timer(&nr->t1timer) / HZ,
1309                        nr->t1 / HZ,
1310                        ax25_display_timer(&nr->t2timer) / HZ,
1311                        nr->t2 / HZ,
1312                        ax25_display_timer(&nr->t4timer) / HZ,
1313                        nr->t4 / HZ,
1314                        ax25_display_timer(&nr->idletimer) / (60 * HZ),
1315                        nr->idle / (60 * HZ),
1316                        nr->n2count,
1317                        nr->n2,
1318                        nr->window,
1319                        sk_wmem_alloc_get(s),
1320                        sk_rmem_alloc_get(s),
1321                        s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1322
1323                bh_unlock_sock(s);
1324        }
1325        return 0;
1326}
1327
1328static const struct seq_operations nr_info_seqops = {
1329        .start = nr_info_start,
1330        .next = nr_info_next,
1331        .stop = nr_info_stop,
1332        .show = nr_info_show,
1333};
1334#endif  /* CONFIG_PROC_FS */
1335
1336static const struct net_proto_family nr_family_ops = {
1337        .family         =       PF_NETROM,
1338        .create         =       nr_create,
1339        .owner          =       THIS_MODULE,
1340};
1341
1342static const struct proto_ops nr_proto_ops = {
1343        .family         =       PF_NETROM,
1344        .owner          =       THIS_MODULE,
1345        .release        =       nr_release,
1346        .bind           =       nr_bind,
1347        .connect        =       nr_connect,
1348        .socketpair     =       sock_no_socketpair,
1349        .accept         =       nr_accept,
1350        .getname        =       nr_getname,
1351        .poll           =       datagram_poll,
1352        .ioctl          =       nr_ioctl,
1353        .gettstamp      =       sock_gettstamp,
1354        .listen         =       nr_listen,
1355        .shutdown       =       sock_no_shutdown,
1356        .setsockopt     =       nr_setsockopt,
1357        .getsockopt     =       nr_getsockopt,
1358        .sendmsg        =       nr_sendmsg,
1359        .recvmsg        =       nr_recvmsg,
1360        .mmap           =       sock_no_mmap,
1361        .sendpage       =       sock_no_sendpage,
1362};
1363
1364static struct notifier_block nr_dev_notifier = {
1365        .notifier_call  =       nr_device_event,
1366};
1367
1368static struct net_device **dev_nr;
1369
1370static struct ax25_protocol nr_pid = {
1371        .pid    = AX25_P_NETROM,
1372        .func   = nr_route_frame
1373};
1374
1375static struct ax25_linkfail nr_linkfail_notifier = {
1376        .func   = nr_link_failed,
1377};
1378
1379static int __init nr_proto_init(void)
1380{
1381        int i;
1382        int rc = proto_register(&nr_proto, 0);
1383
1384        if (rc)
1385                return rc;
1386
1387        if (nr_ndevs > 0x7fffffff/sizeof(struct net_device *)) {
1388                pr_err("NET/ROM: %s - nr_ndevs parameter too large\n",
1389                       __func__);
1390                rc = -EINVAL;
1391                goto unregister_proto;
1392        }
1393
1394        dev_nr = kcalloc(nr_ndevs, sizeof(struct net_device *), GFP_KERNEL);
1395        if (!dev_nr) {
1396                pr_err("NET/ROM: %s - unable to allocate device array\n",
1397                       __func__);
1398                rc = -ENOMEM;
1399                goto unregister_proto;
1400        }
1401
1402        for (i = 0; i < nr_ndevs; i++) {
1403                char name[IFNAMSIZ];
1404                struct net_device *dev;
1405
1406                sprintf(name, "nr%d", i);
1407                dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, nr_setup);
1408                if (!dev) {
1409                        rc = -ENOMEM;
1410                        goto fail;
1411                }
1412
1413                dev->base_addr = i;
1414                rc = register_netdev(dev);
1415                if (rc) {
1416                        free_netdev(dev);
1417                        goto fail;
1418                }
1419                nr_set_lockdep_key(dev);
1420                dev_nr[i] = dev;
1421        }
1422
1423        rc = sock_register(&nr_family_ops);
1424        if (rc)
1425                goto fail;
1426
1427        rc = register_netdevice_notifier(&nr_dev_notifier);
1428        if (rc)
1429                goto out_sock;
1430
1431        ax25_register_pid(&nr_pid);
1432        ax25_linkfail_register(&nr_linkfail_notifier);
1433
1434#ifdef CONFIG_SYSCTL
1435        rc = nr_register_sysctl();
1436        if (rc)
1437                goto out_sysctl;
1438#endif
1439
1440        nr_loopback_init();
1441
1442        rc = -ENOMEM;
1443        if (!proc_create_seq("nr", 0444, init_net.proc_net, &nr_info_seqops))
1444                goto proc_remove1;
1445        if (!proc_create_seq("nr_neigh", 0444, init_net.proc_net,
1446                             &nr_neigh_seqops))
1447                goto proc_remove2;
1448        if (!proc_create_seq("nr_nodes", 0444, init_net.proc_net,
1449                             &nr_node_seqops))
1450                goto proc_remove3;
1451
1452        return 0;
1453
1454proc_remove3:
1455        remove_proc_entry("nr_neigh", init_net.proc_net);
1456proc_remove2:
1457        remove_proc_entry("nr", init_net.proc_net);
1458proc_remove1:
1459
1460        nr_loopback_clear();
1461        nr_rt_free();
1462
1463#ifdef CONFIG_SYSCTL
1464        nr_unregister_sysctl();
1465out_sysctl:
1466#endif
1467        ax25_linkfail_release(&nr_linkfail_notifier);
1468        ax25_protocol_release(AX25_P_NETROM);
1469        unregister_netdevice_notifier(&nr_dev_notifier);
1470out_sock:
1471        sock_unregister(PF_NETROM);
1472fail:
1473        while (--i >= 0) {
1474                unregister_netdev(dev_nr[i]);
1475                free_netdev(dev_nr[i]);
1476        }
1477        kfree(dev_nr);
1478unregister_proto:
1479        proto_unregister(&nr_proto);
1480        return rc;
1481}
1482
1483module_init(nr_proto_init);
1484
1485module_param(nr_ndevs, int, 0);
1486MODULE_PARM_DESC(nr_ndevs, "number of NET/ROM devices");
1487
1488MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1489MODULE_DESCRIPTION("The amateur radio NET/ROM network and transport layer protocol");
1490MODULE_LICENSE("GPL");
1491MODULE_ALIAS_NETPROTO(PF_NETROM);
1492
1493static void __exit nr_exit(void)
1494{
1495        int i;
1496
1497        remove_proc_entry("nr", init_net.proc_net);
1498        remove_proc_entry("nr_neigh", init_net.proc_net);
1499        remove_proc_entry("nr_nodes", init_net.proc_net);
1500        nr_loopback_clear();
1501
1502        nr_rt_free();
1503
1504#ifdef CONFIG_SYSCTL
1505        nr_unregister_sysctl();
1506#endif
1507
1508        ax25_linkfail_release(&nr_linkfail_notifier);
1509        ax25_protocol_release(AX25_P_NETROM);
1510
1511        unregister_netdevice_notifier(&nr_dev_notifier);
1512
1513        sock_unregister(PF_NETROM);
1514
1515        for (i = 0; i < nr_ndevs; i++) {
1516                struct net_device *dev = dev_nr[i];
1517                if (dev) {
1518                        unregister_netdev(dev);
1519                        free_netdev(dev);
1520                }
1521        }
1522
1523        kfree(dev_nr);
1524        proto_unregister(&nr_proto);
1525}
1526module_exit(nr_exit);
1527