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