net/rose/af_rose.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   5  * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
   6  * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net)
   7  * Copyright (C) Tomi Manninen OH2BNS (oh2bns@sral.fi)
   8  */
   9
  10 #include <linux/capability.h>
  11 #include <linux/module.h>
  12 #include <linux/moduleparam.h>
  13 #include <linux/init.h>
  14 #include <linux/errno.h>
  15 #include <linux/types.h>
  16 #include <linux/socket.h>
  17 #include <linux/in.h>
  18 #include <linux/slab.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched/signal.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/timer.h>
  23 #include <linux/string.h>
  24 #include <linux/sockios.h>
  25 #include <linux/net.h>
  26 #include <linux/stat.h>
  27 #include <net/net_namespace.h>
  28 #include <net/ax25.h>
  29 #include <linux/inet.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/if_arp.h>
  32 #include <linux/skbuff.h>
  33 #include <net/sock.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/fcntl.h>
  36 #include <linux/termios.h>
  37 #include <linux/mm.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/notifier.h>
  40 #include <net/rose.h>
  41 #include <linux/proc_fs.h>
  42 #include <linux/seq_file.h>
  43 #include <net/tcp_states.h>
  44 #include <net/ip.h>
  45 #include <net/arp.h>
  46
  47 static int rose_ndevs = 10;
  48
  49 int sysctl_rose_restart_request_timeout = ROSE_DEFAULT_T0;
  50 int sysctl_rose_call_request_timeout    = ROSE_DEFAULT_T1;
  51 int sysctl_rose_reset_request_timeout   = ROSE_DEFAULT_T2;
  52 int sysctl_rose_clear_request_timeout   = ROSE_DEFAULT_T3;
  53 int sysctl_rose_no_activity_timeout     = ROSE_DEFAULT_IDLE;
  54 int sysctl_rose_ack_hold_back_timeout   = ROSE_DEFAULT_HB;
  55 int sysctl_rose_routing_control         = ROSE_DEFAULT_ROUTING;
  56 int sysctl_rose_link_fail_timeout       = ROSE_DEFAULT_FAIL_TIMEOUT;
  57 int sysctl_rose_maximum_vcs             = ROSE_DEFAULT_MAXVC;
  58 int sysctl_rose_window_size             = ROSE_DEFAULT_WINDOW_SIZE;
  59
  60 static HLIST_HEAD(rose_list);
  61 static DEFINE_SPINLOCK(rose_list_lock);
  62
  63 static const struct proto_ops rose_proto_ops;
  64
  65 ax25_address rose_callsign;
  66
  67 /*
  68  * ROSE network devices are virtual network devices encapsulating ROSE
  69  * frames into AX.25 which will be sent through an AX.25 device, so form a
  70  * special "super class" of normal net devices; split their locks off into a
  71  * separate class since they always nest.
  72  */
  73 static struct lock_class_key rose_netdev_xmit_lock_key;
  74 static struct lock_class_key rose_netdev_addr_lock_key;
  75
  76 static void rose_set_lockdep_one(struct net_device *dev,
  77                                  struct netdev_queue *txq,
  78                                  void *_unused)
  79 {
  80         lockdep_set_class(&txq->_xmit_lock, &rose_netdev_xmit_lock_key);
  81 }
  82
  83 static void rose_set_lockdep_key(struct net_device *dev)
  84 {
  85         lockdep_set_class(&dev->addr_list_lock, &rose_netdev_addr_lock_key);
  86         netdev_for_each_tx_queue(dev, rose_set_lockdep_one, NULL);
  87 }
  88
  89 /*
  90  *      Convert a ROSE address into text.
  91  */
  92 char *rose2asc(char *buf, const rose_address *addr)
  93 {
  94         if (addr->rose_addr[0] == 0x00 && addr->rose_addr[1] == 0x00 &&
  95             addr->rose_addr[2] == 0x00 && addr->rose_addr[3] == 0x00 &&
  96             addr->rose_addr[4] == 0x00) {
  97                 strcpy(buf, "*");
  98         } else {
  99                 sprintf(buf, "%02X%02X%02X%02X%02X", addr->rose_addr[0] & 0xFF,
 100                                                 addr->rose_addr[1] & 0xFF,
 101                                                 addr->rose_addr[2] & 0xFF,
 102                                                 addr->rose_addr[3] & 0xFF,
 103                                                 addr->rose_addr[4] & 0xFF);
 104         }
 105
 106         return buf;
 107 }
 108
 109 /*
 110  *      Compare two ROSE addresses, 0 == equal.
 111  */
 112 int rosecmp(const rose_address *addr1, const rose_address *addr2)
 113 {
 114         int i;
 115
 116         for (i = 0; i < 5; i++)
 117                 if (addr1->rose_addr[i] != addr2->rose_addr[i])
 118                         return 1;
 119
 120         return 0;
 121 }
 122
 123 /*
 124  *      Compare two ROSE addresses for only mask digits, 0 == equal.
 125  */
 126 int rosecmpm(const rose_address *addr1, const rose_address *addr2,
 127              unsigned short mask)
 128 {
 129         unsigned int i, j;
 130
 131         if (mask > 10)
 132                 return 1;
 133
 134         for (i = 0; i < mask; i++) {
 135                 j = i / 2;
 136
 137                 if ((i % 2) != 0) {
 138                         if ((addr1->rose_addr[j] & 0x0F) != (addr2->rose_addr[j] & 0x0F))
 139                                 return 1;
 140                 } else {
 141                         if ((addr1->rose_addr[j] & 0xF0) != (addr2->rose_addr[j] & 0xF0))
 142                                 return 1;
 143                 }
 144         }
 145
 146         return 0;
 147 }
 148
 149 /*
 150  *      Socket removal during an interrupt is now safe.
 151  */
 152 static void rose_remove_socket(struct sock *sk)
 153 {
 154         spin_lock_bh(&rose_list_lock);
 155         sk_del_node_init(sk);
 156         spin_unlock_bh(&rose_list_lock);
 157 }
 158
 159 /*
 160  *      Kill all bound sockets on a broken link layer connection to a
 161  *      particular neighbour.
 162  */
 163 void rose_kill_by_neigh(struct rose_neigh *neigh)
 164 {
 165         struct sock *s;
 166
 167         spin_lock_bh(&rose_list_lock);
 168         sk_for_each(s, &rose_list) {
 169                 struct rose_sock *rose = rose_sk(s);
 170
 171                 if (rose->neighbour == neigh) {
 172                         rose_disconnect(s, ENETUNREACH, ROSE_OUT_OF_ORDER, 0);
 173                         rose->neighbour->use--;
 174                         rose->neighbour = NULL;
 175                 }
 176         }
 177         spin_unlock_bh(&rose_list_lock);
 178 }
 179
 180 /*
 181  *      Kill all bound sockets on a dropped device.
 182  */
 183 static void rose_kill_by_device(struct net_device *dev)
 184 {
 185         struct sock *s;
 186
 187         spin_lock_bh(&rose_list_lock);
 188         sk_for_each(s, &rose_list) {
 189                 struct rose_sock *rose = rose_sk(s);
 190
 191                 if (rose->device == dev) {
 192                         rose_disconnect(s, ENETUNREACH, ROSE_OUT_OF_ORDER, 0);
 193                         if (rose->neighbour)
 194                                 rose->neighbour->use--;
 195                         netdev_put(rose->device, &rose->dev_tracker);
 196                         rose->device = NULL;
 197                 }
 198         }
 199         spin_unlock_bh(&rose_list_lock);
 200 }
 201
 202 /*
 203  *      Handle device status changes.
 204  */
 205 static int rose_device_event(struct notifier_block *this,
 206                              unsigned long event, void *ptr)
 207 {
 208         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 209
 210         if (!net_eq(dev_net(dev), &init_net))
 211                 return NOTIFY_DONE;
 212
 213         if (event != NETDEV_DOWN)
 214                 return NOTIFY_DONE;
 215
 216         switch (dev->type) {
 217         case ARPHRD_ROSE:
 218                 rose_kill_by_device(dev);
 219                 break;
 220         case ARPHRD_AX25:
 221                 rose_link_device_down(dev);
 222                 rose_rt_device_down(dev);
 223                 break;
 224         }
 225
 226         return NOTIFY_DONE;
 227 }
 228
 229 /*
 230  *      Add a socket to the bound sockets list.
 231  */
 232 static void rose_insert_socket(struct sock *sk)
 233 {
 234
 235         spin_lock_bh(&rose_list_lock);
 236         sk_add_node(sk, &rose_list);
 237         spin_unlock_bh(&rose_list_lock);
 238 }
 239
 240 /*
 241  *      Find a socket that wants to accept the Call Request we just
 242  *      received.
 243  */
 244 static struct sock *rose_find_listener(rose_address *addr, ax25_address *call)
 245 {
 246         struct sock *s;
 247
 248         spin_lock_bh(&rose_list_lock);
 249         sk_for_each(s, &rose_list) {
 250                 struct rose_sock *rose = rose_sk(s);
 251
 252                 if (!rosecmp(&rose->source_addr, addr) &&
 253                     !ax25cmp(&rose->source_call, call) &&
 254                     !rose->source_ndigis && s->sk_state == TCP_LISTEN)
 255                         goto found;
 256         }
 257
 258         sk_for_each(s, &rose_list) {
 259                 struct rose_sock *rose = rose_sk(s);
 260
 261                 if (!rosecmp(&rose->source_addr, addr) &&
 262                     !ax25cmp(&rose->source_call, &null_ax25_address) &&
 263                     s->sk_state == TCP_LISTEN)
 264                         goto found;
 265         }
 266         s = NULL;
 267 found:
 268         spin_unlock_bh(&rose_list_lock);
 269         return s;
 270 }
 271
 272 /*
 273  *      Find a connected ROSE socket given my LCI and device.
 274  */
 275 struct sock *rose_find_socket(unsigned int lci, struct rose_neigh *neigh)
 276 {
 277         struct sock *s;
 278
 279         spin_lock_bh(&rose_list_lock);
 280         sk_for_each(s, &rose_list) {
 281                 struct rose_sock *rose = rose_sk(s);
 282
 283                 if (rose->lci == lci && rose->neighbour == neigh)
 284                         goto found;
 285         }
 286         s = NULL;
 287 found:
 288         spin_unlock_bh(&rose_list_lock);
 289         return s;
 290 }
 291
 292 /*
 293  *      Find a unique LCI for a given device.
 294  */
 295 unsigned int rose_new_lci(struct rose_neigh *neigh)
 296 {
 297         int lci;
 298
 299         if (neigh->dce_mode) {
 300                 for (lci = 1; lci <= sysctl_rose_maximum_vcs; lci++)
 301                         if (rose_find_socket(lci, neigh) == NULL && rose_route_free_lci(lci, neigh) == NULL)
 302                                 return lci;
 303         } else {
 304                 for (lci = sysctl_rose_maximum_vcs; lci > 0; lci--)
 305                         if (rose_find_socket(lci, neigh) == NULL && rose_route_free_lci(lci, neigh) == NULL)
 306                                 return lci;
 307         }
 308
 309         return 0;
 310 }
 311
 312 /*
 313  *      Deferred destroy.
 314  */
 315 void rose_destroy_socket(struct sock *);
 316
 317 /*
 318  *      Handler for deferred kills.
 319  */
 320 static void rose_destroy_timer(struct timer_list *t)
 321 {
 322         struct sock *sk = from_timer(sk, t, sk_timer);
 323
 324         rose_destroy_socket(sk);
 325 }
 326
 327 /*
 328  *      This is called from user mode and the timers. Thus it protects itself
 329  *      against interrupt users but doesn't worry about being called during
 330  *      work.  Once it is removed from the queue no interrupt or bottom half
 331  *      will touch it and we are (fairly 8-) ) safe.
 332  */
 333 void rose_destroy_socket(struct sock *sk)
 334 {
 335         struct sk_buff *skb;
 336
 337         rose_remove_socket(sk);
 338         rose_stop_heartbeat(sk);
 339         rose_stop_idletimer(sk);
 340         rose_stop_timer(sk);
 341
 342         rose_clear_queues(sk);          /* Flush the queues */
 343
 344         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 345                 if (skb->sk != sk) {    /* A pending connection */
 346                         /* Queue the unaccepted socket for death */
 347                         sock_set_flag(skb->sk, SOCK_DEAD);
 348                         rose_start_heartbeat(skb->sk);
 349                         rose_sk(skb->sk)->state = ROSE_STATE_0;
 350                 }
 351
 352                 kfree_skb(skb);
 353         }
 354
 355         if (sk_has_allocations(sk)) {
 356                 /* Defer: outstanding buffers */
 357                 timer_setup(&sk->sk_timer, rose_destroy_timer, 0);
 358                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 359                 add_timer(&sk->sk_timer);
 360         } else
 361                 sock_put(sk);
 362 }
 363
 364 /*
 365  *      Handling for system calls applied via the various interfaces to a
 366  *      ROSE socket object.
 367  */
 368
 369 static int rose_setsockopt(struct socket *sock, int level, int optname,
 370                 sockptr_t optval, unsigned int optlen)
 371 {
 372         struct sock *sk = sock->sk;
 373         struct rose_sock *rose = rose_sk(sk);
 374         int opt;
 375
 376         if (level != SOL_ROSE)
 377                 return -ENOPROTOOPT;
 378
 379         if (optlen < sizeof(int))
 380                 return -EINVAL;
 381
 382         if (copy_from_sockptr(&opt, optval, sizeof(int)))
 383                 return -EFAULT;
 384
 385         switch (optname) {
 386         case ROSE_DEFER:
 387                 rose->defer = opt ? 1 : 0;
 388                 return 0;
 389
 390         case ROSE_T1:
 391                 if (opt < 1)
 392                         return -EINVAL;
 393                 rose->t1 = opt * HZ;
 394                 return 0;
 395
 396         case ROSE_T2:
 397                 if (opt < 1)
 398                         return -EINVAL;
 399                 rose->t2 = opt * HZ;
 400                 return 0;
 401
 402         case ROSE_T3:
 403                 if (opt < 1)
 404                         return -EINVAL;
 405                 rose->t3 = opt * HZ;
 406                 return 0;
 407
 408         case ROSE_HOLDBACK:
 409                 if (opt < 1)
 410                         return -EINVAL;
 411                 rose->hb = opt * HZ;
 412                 return 0;
 413
 414         case ROSE_IDLE:
 415                 if (opt < 0)
 416                         return -EINVAL;
 417                 rose->idle = opt * 60 * HZ;
 418                 return 0;
 419
 420         case ROSE_QBITINCL:
 421                 rose->qbitincl = opt ? 1 : 0;
 422                 return 0;
 423
 424         default:
 425                 return -ENOPROTOOPT;
 426         }
 427 }
 428
 429 static int rose_getsockopt(struct socket *sock, int level, int optname,
 430         char __user *optval, int __user *optlen)
 431 {
 432         struct sock *sk = sock->sk;
 433         struct rose_sock *rose = rose_sk(sk);
 434         int val = 0;
 435         int len;
 436
 437         if (level != SOL_ROSE)
 438                 return -ENOPROTOOPT;
 439
 440         if (get_user(len, optlen))
 441                 return -EFAULT;
 442
 443         if (len < 0)
 444                 return -EINVAL;
 445
 446         switch (optname) {
 447         case ROSE_DEFER:
 448                 val = rose->defer;
 449                 break;
 450
 451         case ROSE_T1:
 452                 val = rose->t1 / HZ;
 453                 break;
 454
 455         case ROSE_T2:
 456                 val = rose->t2 / HZ;
 457                 break;
 458
 459         case ROSE_T3:
 460                 val = rose->t3 / HZ;
 461                 break;
 462
 463         case ROSE_HOLDBACK:
 464                 val = rose->hb / HZ;
 465                 break;
 466
 467         case ROSE_IDLE:
 468                 val = rose->idle / (60 * HZ);
 469                 break;
 470
 471         case ROSE_QBITINCL:
 472                 val = rose->qbitincl;
 473                 break;
 474
 475         default:
 476                 return -ENOPROTOOPT;
 477         }
 478
 479         len = min_t(unsigned int, len, sizeof(int));
 480
 481         if (put_user(len, optlen))
 482                 return -EFAULT;
 483
 484         return copy_to_user(optval, &val, len) ? -EFAULT : 0;
 485 }
 486
 487 static int rose_listen(struct socket *sock, int backlog)
 488 {
 489         struct sock *sk = sock->sk;
 490
 491         lock_sock(sk);
 492         if (sock->state != SS_UNCONNECTED) {
 493                 release_sock(sk);
 494                 return -EINVAL;
 495         }
 496
 497         if (sk->sk_state != TCP_LISTEN) {
 498                 struct rose_sock *rose = rose_sk(sk);
 499
 500                 rose->dest_ndigis = 0;
 501                 memset(&rose->dest_addr, 0, ROSE_ADDR_LEN);
 502                 memset(&rose->dest_call, 0, AX25_ADDR_LEN);
 503                 memset(rose->dest_digis, 0, AX25_ADDR_LEN * ROSE_MAX_DIGIS);
 504                 sk->sk_max_ack_backlog = backlog;
 505                 sk->sk_state           = TCP_LISTEN;
 506                 release_sock(sk);
 507                 return 0;
 508         }
 509         release_sock(sk);
 510
 511         return -EOPNOTSUPP;
 512 }
 513
 514 static struct proto rose_proto = {
 515         .name     = "ROSE",
 516         .owner    = THIS_MODULE,
 517         .obj_size = sizeof(struct rose_sock),
 518 };
 519
 520 static int rose_create(struct net *net, struct socket *sock, int protocol,
 521                        int kern)
 522 {
 523         struct sock *sk;
 524         struct rose_sock *rose;
 525
 526         if (!net_eq(net, &init_net))
 527                 return -EAFNOSUPPORT;
 528
 529         if (sock->type != SOCK_SEQPACKET || protocol != 0)
 530                 return -ESOCKTNOSUPPORT;
 531
 532         sk = sk_alloc(net, PF_ROSE, GFP_ATOMIC, &rose_proto, kern);
 533         if (sk == NULL)
 534                 return -ENOMEM;
 535
 536         rose = rose_sk(sk);
 537
 538         sock_init_data(sock, sk);
 539
 540         skb_queue_head_init(&rose->ack_queue);
 541 #ifdef M_BIT
 542         skb_queue_head_init(&rose->frag_queue);
 543         rose->fraglen    = 0;
 544 #endif
 545
 546         sock->ops    = &rose_proto_ops;
 547         sk->sk_protocol = protocol;
 548
 549         timer_setup(&rose->timer, NULL, 0);
 550         timer_setup(&rose->idletimer, NULL, 0);
 551
 552         rose->t1   = msecs_to_jiffies(sysctl_rose_call_request_timeout);
 553         rose->t2   = msecs_to_jiffies(sysctl_rose_reset_request_timeout);
 554         rose->t3   = msecs_to_jiffies(sysctl_rose_clear_request_timeout);
 555         rose->hb   = msecs_to_jiffies(sysctl_rose_ack_hold_back_timeout);
 556         rose->idle = msecs_to_jiffies(sysctl_rose_no_activity_timeout);
 557
 558         rose->state = ROSE_STATE_0;
 559
 560         return 0;
 561 }
 562
 563 static struct sock *rose_make_new(struct sock *osk)
 564 {
 565         struct sock *sk;
 566         struct rose_sock *rose, *orose;
 567
 568         if (osk->sk_type != SOCK_SEQPACKET)
 569                 return NULL;
 570
 571         sk = sk_alloc(sock_net(osk), PF_ROSE, GFP_ATOMIC, &rose_proto, 0);
 572         if (sk == NULL)
 573                 return NULL;
 574
 575         rose = rose_sk(sk);
 576
 577         sock_init_data(NULL, sk);
 578
 579         skb_queue_head_init(&rose->ack_queue);
 580 #ifdef M_BIT
 581         skb_queue_head_init(&rose->frag_queue);
 582         rose->fraglen  = 0;
 583 #endif
 584
 585         sk->sk_type     = osk->sk_type;
 586         sk->sk_priority = osk->sk_priority;
 587         sk->sk_protocol = osk->sk_protocol;
 588         sk->sk_rcvbuf   = osk->sk_rcvbuf;
 589         sk->sk_sndbuf   = osk->sk_sndbuf;
 590         sk->sk_state    = TCP_ESTABLISHED;
 591         sock_copy_flags(sk, osk);
 592
 593         timer_setup(&rose->timer, NULL, 0);
 594         timer_setup(&rose->idletimer, NULL, 0);
 595
 596         orose           = rose_sk(osk);
 597         rose->t1        = orose->t1;
 598         rose->t2        = orose->t2;
 599         rose->t3        = orose->t3;
 600         rose->hb        = orose->hb;
 601         rose->idle      = orose->idle;
 602         rose->defer     = orose->defer;
 603         rose->device    = orose->device;
 604         if (rose->device)
 605                 netdev_hold(rose->device, &rose->dev_tracker, GFP_ATOMIC);
 606         rose->qbitincl  = orose->qbitincl;
 607
 608         return sk;
 609 }
 610
 611 static int rose_release(struct socket *sock)
 612 {
 613         struct sock *sk = sock->sk;
 614         struct rose_sock *rose;
 615
 616         if (sk == NULL) return 0;
 617
 618         sock_hold(sk);
 619         sock_orphan(sk);
 620         lock_sock(sk);
 621         rose = rose_sk(sk);
 622
 623         switch (rose->state) {
 624         case ROSE_STATE_0:
 625                 release_sock(sk);
 626                 rose_disconnect(sk, 0, -1, -1);
 627                 lock_sock(sk);
 628                 rose_destroy_socket(sk);
 629                 break;
 630
 631         case ROSE_STATE_2:
 632                 rose->neighbour->use--;
 633                 release_sock(sk);
 634                 rose_disconnect(sk, 0, -1, -1);
 635                 lock_sock(sk);
 636                 rose_destroy_socket(sk);
 637                 break;
 638
 639         case ROSE_STATE_1:
 640         case ROSE_STATE_3:
 641         case ROSE_STATE_4:
 642         case ROSE_STATE_5:
 643                 rose_clear_queues(sk);
 644                 rose_stop_idletimer(sk);
 645                 rose_write_internal(sk, ROSE_CLEAR_REQUEST);
 646                 rose_start_t3timer(sk);
 647                 rose->state  = ROSE_STATE_2;
 648                 sk->sk_state    = TCP_CLOSE;
 649                 sk->sk_shutdown |= SEND_SHUTDOWN;
 650                 sk->sk_state_change(sk);
 651                 sock_set_flag(sk, SOCK_DEAD);
 652                 sock_set_flag(sk, SOCK_DESTROY);
 653                 break;
 654
 655         default:
 656                 break;
 657         }
 658
 659         netdev_put(rose->device, &rose->dev_tracker);
 660         sock->sk = NULL;
 661         release_sock(sk);
 662         sock_put(sk);
 663
 664         return 0;
 665 }
 666
 667 static int rose_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 668 {
 669         struct sock *sk = sock->sk;
 670         struct rose_sock *rose = rose_sk(sk);
 671         struct sockaddr_rose *addr = (struct sockaddr_rose *)uaddr;
 672         struct net_device *dev;
 673         ax25_address *source;
 674         ax25_uid_assoc *user;
 675         int n;
 676
 677         if (!sock_flag(sk, SOCK_ZAPPED))
 678                 return -EINVAL;
 679
 680         if (addr_len != sizeof(struct sockaddr_rose) && addr_len != sizeof(struct full_sockaddr_rose))
 681                 return -EINVAL;
 682
 683         if (addr->srose_family != AF_ROSE)
 684                 return -EINVAL;
 685
 686         if (addr_len == sizeof(struct sockaddr_rose) && addr->srose_ndigis > 1)
 687                 return -EINVAL;
 688
 689         if ((unsigned int) addr->srose_ndigis > ROSE_MAX_DIGIS)
 690                 return -EINVAL;
 691
 692         if ((dev = rose_dev_get(&addr->srose_addr)) == NULL)
 693                 return -EADDRNOTAVAIL;
 694
 695         source = &addr->srose_call;
 696
 697         user = ax25_findbyuid(current_euid());
 698         if (user) {
 699                 rose->source_call = user->call;
 700                 ax25_uid_put(user);
 701         } else {
 702                 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
 703                         dev_put(dev);
 704                         return -EACCES;
 705                 }
 706                 rose->source_call   = *source;
 707         }
 708
 709         rose->source_addr   = addr->srose_addr;
 710         rose->device        = dev;
 711         netdev_tracker_alloc(rose->device, &rose->dev_tracker, GFP_KERNEL);
 712         rose->source_ndigis = addr->srose_ndigis;
 713
 714         if (addr_len == sizeof(struct full_sockaddr_rose)) {
 715                 struct full_sockaddr_rose *full_addr = (struct full_sockaddr_rose *)uaddr;
 716                 for (n = 0 ; n < addr->srose_ndigis ; n++)
 717                         rose->source_digis[n] = full_addr->srose_digis[n];
 718         } else {
 719                 if (rose->source_ndigis == 1) {
 720                         rose->source_digis[0] = addr->srose_digi;
 721                 }
 722         }
 723
 724         rose_insert_socket(sk);
 725
 726         sock_reset_flag(sk, SOCK_ZAPPED);
 727
 728         return 0;
 729 }
 730
 731 static int rose_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
 732 {
 733         struct sock *sk = sock->sk;
 734         struct rose_sock *rose = rose_sk(sk);
 735         struct sockaddr_rose *addr = (struct sockaddr_rose *)uaddr;
 736         unsigned char cause, diagnostic;
 737         ax25_uid_assoc *user;
 738         int n, err = 0;
 739
 740         if (addr_len != sizeof(struct sockaddr_rose) && addr_len != sizeof(struct full_sockaddr_rose))
 741                 return -EINVAL;
 742
 743         if (addr->srose_family != AF_ROSE)
 744                 return -EINVAL;
 745
 746         if (addr_len == sizeof(struct sockaddr_rose) && addr->srose_ndigis > 1)
 747                 return -EINVAL;
 748
 749         if ((unsigned int) addr->srose_ndigis > ROSE_MAX_DIGIS)
 750                 return -EINVAL;
 751
 752         /* Source + Destination digis should not exceed ROSE_MAX_DIGIS */
 753         if ((rose->source_ndigis + addr->srose_ndigis) > ROSE_MAX_DIGIS)
 754                 return -EINVAL;
 755
 756         lock_sock(sk);
 757
 758         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 759                 /* Connect completed during a ERESTARTSYS event */
 760                 sock->state = SS_CONNECTED;
 761                 goto out_release;
 762         }
 763
 764         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 765                 sock->state = SS_UNCONNECTED;
 766                 err = -ECONNREFUSED;
 767                 goto out_release;
 768         }
 769
 770         if (sk->sk_state == TCP_ESTABLISHED) {
 771                 /* No reconnect on a seqpacket socket */
 772                 err = -EISCONN;
 773                 goto out_release;
 774         }
 775
 776         sk->sk_state   = TCP_CLOSE;
 777         sock->state = SS_UNCONNECTED;
 778
 779         rose->neighbour = rose_get_neigh(&addr->srose_addr, &cause,
 780                                          &diagnostic, 0);
 781         if (!rose->neighbour) {
 782                 err = -ENETUNREACH;
 783                 goto out_release;
 784         }
 785
 786         rose->lci = rose_new_lci(rose->neighbour);
 787         if (!rose->lci) {
 788                 err = -ENETUNREACH;
 789                 goto out_release;
 790         }
 791
 792         if (sock_flag(sk, SOCK_ZAPPED)) {       /* Must bind first - autobinding in this may or may not work */
 793                 struct net_device *dev;
 794
 795                 sock_reset_flag(sk, SOCK_ZAPPED);
 796
 797                 dev = rose_dev_first();
 798                 if (!dev) {
 799                         err = -ENETUNREACH;
 800                         goto out_release;
 801                 }
 802
 803                 user = ax25_findbyuid(current_euid());
 804                 if (!user) {
 805                         err = -EINVAL;
 806                         dev_put(dev);
 807                         goto out_release;
 808                 }
 809
 810                 memcpy(&rose->source_addr, dev->dev_addr, ROSE_ADDR_LEN);
 811                 rose->source_call = user->call;
 812                 rose->device      = dev;
 813                 netdev_tracker_alloc(rose->device, &rose->dev_tracker,
 814                                      GFP_KERNEL);
 815                 ax25_uid_put(user);
 816
 817                 rose_insert_socket(sk);         /* Finish the bind */
 818         }
 819         rose->dest_addr   = addr->srose_addr;
 820         rose->dest_call   = addr->srose_call;
 821         rose->rand        = ((long)rose & 0xFFFF) + rose->lci;
 822         rose->dest_ndigis = addr->srose_ndigis;
 823
 824         if (addr_len == sizeof(struct full_sockaddr_rose)) {
 825                 struct full_sockaddr_rose *full_addr = (struct full_sockaddr_rose *)uaddr;
 826                 for (n = 0 ; n < addr->srose_ndigis ; n++)
 827                         rose->dest_digis[n] = full_addr->srose_digis[n];
 828         } else {
 829                 if (rose->dest_ndigis == 1) {
 830                         rose->dest_digis[0] = addr->srose_digi;
 831                 }
 832         }
 833
 834         /* Move to connecting socket, start sending Connect Requests */
 835         sock->state   = SS_CONNECTING;
 836         sk->sk_state     = TCP_SYN_SENT;
 837
 838         rose->state = ROSE_STATE_1;
 839
 840         rose->neighbour->use++;
 841
 842         rose_write_internal(sk, ROSE_CALL_REQUEST);
 843         rose_start_heartbeat(sk);
 844         rose_start_t1timer(sk);
 845
 846         /* Now the loop */
 847         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
 848                 err = -EINPROGRESS;
 849                 goto out_release;
 850         }
 851
 852         /*
 853          * A Connect Ack with Choke or timeout or failed routing will go to
 854          * closed.
 855          */
 856         if (sk->sk_state == TCP_SYN_SENT) {
 857                 DEFINE_WAIT(wait);
 858
 859                 for (;;) {
 860                         prepare_to_wait(sk_sleep(sk), &wait,
 861                                         TASK_INTERRUPTIBLE);
 862                         if (sk->sk_state != TCP_SYN_SENT)
 863                                 break;
 864                         if (!signal_pending(current)) {
 865                                 release_sock(sk);
 866                                 schedule();
 867                                 lock_sock(sk);
 868                                 continue;
 869                         }
 870                         err = -ERESTARTSYS;
 871                         break;
 872                 }
 873                 finish_wait(sk_sleep(sk), &wait);
 874
 875                 if (err)
 876                         goto out_release;
 877         }
 878
 879         if (sk->sk_state != TCP_ESTABLISHED) {
 880                 sock->state = SS_UNCONNECTED;
 881                 err = sock_error(sk);   /* Always set at this point */
 882                 goto out_release;
 883         }
 884
 885         sock->state = SS_CONNECTED;
 886
 887 out_release:
 888         release_sock(sk);
 889
 890         return err;
 891 }
 892
 893 static int rose_accept(struct socket *sock, struct socket *newsock, int flags,
 894                        bool kern)
 895 {
 896         struct sk_buff *skb;
 897         struct sock *newsk;
 898         DEFINE_WAIT(wait);
 899         struct sock *sk;
 900         int err = 0;
 901
 902         if ((sk = sock->sk) == NULL)
 903                 return -EINVAL;
 904
 905         lock_sock(sk);
 906         if (sk->sk_type != SOCK_SEQPACKET) {
 907                 err = -EOPNOTSUPP;
 908                 goto out_release;
 909         }
 910
 911         if (sk->sk_state != TCP_LISTEN) {
 912                 err = -EINVAL;
 913                 goto out_release;
 914         }
 915
 916         /*
 917          *      The write queue this time is holding sockets ready to use
 918          *      hooked into the SABM we saved
 919          */
 920         for (;;) {
 921                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 922
 923                 skb = skb_dequeue(&sk->sk_receive_queue);
 924                 if (skb)
 925                         break;
 926
 927                 if (flags & O_NONBLOCK) {
 928                         err = -EWOULDBLOCK;
 929                         break;
 930                 }
 931                 if (!signal_pending(current)) {
 932                         release_sock(sk);
 933                         schedule();
 934                         lock_sock(sk);
 935                         continue;
 936                 }
 937                 err = -ERESTARTSYS;
 938                 break;
 939         }
 940         finish_wait(sk_sleep(sk), &wait);
 941         if (err)
 942                 goto out_release;
 943
 944         newsk = skb->sk;
 945         sock_graft(newsk, newsock);
 946
 947         /* Now attach up the new socket */
 948         skb->sk = NULL;
 949         kfree_skb(skb);
 950         sk_acceptq_removed(sk);
 951
 952 out_release:
 953         release_sock(sk);
 954
 955         return err;
 956 }
 957
 958 static int rose_getname(struct socket *sock, struct sockaddr *uaddr,
 959         int peer)
 960 {
 961         struct full_sockaddr_rose *srose = (struct full_sockaddr_rose *)uaddr;
 962         struct sock *sk = sock->sk;
 963         struct rose_sock *rose = rose_sk(sk);
 964         int n;
 965
 966         memset(srose, 0, sizeof(*srose));
 967         if (peer != 0) {
 968                 if (sk->sk_state != TCP_ESTABLISHED)
 969                         return -ENOTCONN;
 970                 srose->srose_family = AF_ROSE;
 971                 srose->srose_addr   = rose->dest_addr;
 972                 srose->srose_call   = rose->dest_call;
 973                 srose->srose_ndigis = rose->dest_ndigis;
 974                 for (n = 0; n < rose->dest_ndigis; n++)
 975                         srose->srose_digis[n] = rose->dest_digis[n];
 976         } else {
 977                 srose->srose_family = AF_ROSE;
 978                 srose->srose_addr   = rose->source_addr;
 979                 srose->srose_call   = rose->source_call;
 980                 srose->srose_ndigis = rose->source_ndigis;
 981                 for (n = 0; n < rose->source_ndigis; n++)
 982                         srose->srose_digis[n] = rose->source_digis[n];
 983         }
 984
 985         return sizeof(struct full_sockaddr_rose);
 986 }
 987
 988 int rose_rx_call_request(struct sk_buff *skb, struct net_device *dev, struct rose_neigh *neigh, unsigned int lci)
 989 {
 990         struct sock *sk;
 991         struct sock *make;
 992         struct rose_sock *make_rose;
 993         struct rose_facilities_struct facilities;
 994         int n;
 995
 996         skb->sk = NULL;         /* Initially we don't know who it's for */
 997
 998         /*
 999          *      skb->data points to the rose frame start
1000          */
1001         memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1002
1003         if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF,
1004                                    skb->len - ROSE_CALL_REQ_FACILITIES_OFF,
1005                                    &facilities)) {
1006                 rose_transmit_clear_request(neigh, lci, ROSE_INVALID_FACILITY, 76);
1007                 return 0;
1008         }
1009
1010         sk = rose_find_listener(&facilities.source_addr, &facilities.source_call);
1011
1012         /*
1013          * We can't accept the Call Request.
1014          */
1015         if (sk == NULL || sk_acceptq_is_full(sk) ||
1016             (make = rose_make_new(sk)) == NULL) {
1017                 rose_transmit_clear_request(neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1018                 return 0;
1019         }
1020
1021         skb->sk     = make;
1022         make->sk_state = TCP_ESTABLISHED;
1023         make_rose = rose_sk(make);
1024
1025         make_rose->lci           = lci;
1026         make_rose->dest_addr     = facilities.dest_addr;
1027         make_rose->dest_call     = facilities.dest_call;
1028         make_rose->dest_ndigis   = facilities.dest_ndigis;
1029         for (n = 0 ; n < facilities.dest_ndigis ; n++)
1030                 make_rose->dest_digis[n] = facilities.dest_digis[n];
1031         make_rose->source_addr   = facilities.source_addr;
1032         make_rose->source_call   = facilities.source_call;
1033         make_rose->source_ndigis = facilities.source_ndigis;
1034         for (n = 0 ; n < facilities.source_ndigis ; n++)
1035                 make_rose->source_digis[n] = facilities.source_digis[n];
1036         make_rose->neighbour     = neigh;
1037         make_rose->device        = dev;
1038         /* Caller got a reference for us. */
1039         netdev_tracker_alloc(make_rose->device, &make_rose->dev_tracker,
1040                              GFP_ATOMIC);
1041         make_rose->facilities    = facilities;
1042
1043         make_rose->neighbour->use++;
1044
1045         if (rose_sk(sk)->defer) {
1046                 make_rose->state = ROSE_STATE_5;
1047         } else {
1048                 rose_write_internal(make, ROSE_CALL_ACCEPTED);
1049                 make_rose->state = ROSE_STATE_3;
1050                 rose_start_idletimer(make);
1051         }
1052
1053         make_rose->condition = 0x00;
1054         make_rose->vs        = 0;
1055         make_rose->va        = 0;
1056         make_rose->vr        = 0;
1057         make_rose->vl        = 0;
1058         sk_acceptq_added(sk);
1059
1060         rose_insert_socket(make);
1061
1062         skb_queue_head(&sk->sk_receive_queue, skb);
1063
1064         rose_start_heartbeat(make);
1065
1066         if (!sock_flag(sk, SOCK_DEAD))
1067                 sk->sk_data_ready(sk);
1068
1069         return 1;
1070 }
1071
1072 static int rose_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1073 {
1074         struct sock *sk = sock->sk;
1075         struct rose_sock *rose = rose_sk(sk);
1076         DECLARE_SOCKADDR(struct sockaddr_rose *, usrose, msg->msg_name);
1077         int err;
1078         struct full_sockaddr_rose srose;
1079         struct sk_buff *skb;
1080         unsigned char *asmptr;
1081         int n, size, qbit = 0;
1082
1083         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
1084                 return -EINVAL;
1085
1086         if (sock_flag(sk, SOCK_ZAPPED))
1087                 return -EADDRNOTAVAIL;
1088
1089         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1090                 send_sig(SIGPIPE, current, 0);
1091                 return -EPIPE;
1092         }
1093
1094         if (rose->neighbour == NULL || rose->device == NULL)
1095                 return -ENETUNREACH;
1096
1097         if (usrose != NULL) {
1098                 if (msg->msg_namelen != sizeof(struct sockaddr_rose) && msg->msg_namelen != sizeof(struct full_sockaddr_rose))
1099                         return -EINVAL;
1100                 memset(&srose, 0, sizeof(struct full_sockaddr_rose));
1101                 memcpy(&srose, usrose, msg->msg_namelen);
1102                 if (rosecmp(&rose->dest_addr, &srose.srose_addr) != 0 ||
1103                     ax25cmp(&rose->dest_call, &srose.srose_call) != 0)
1104                         return -EISCONN;
1105                 if (srose.srose_ndigis != rose->dest_ndigis)
1106                         return -EISCONN;
1107                 if (srose.srose_ndigis == rose->dest_ndigis) {
1108                         for (n = 0 ; n < srose.srose_ndigis ; n++)
1109                                 if (ax25cmp(&rose->dest_digis[n],
1110                                             &srose.srose_digis[n]))
1111                                         return -EISCONN;
1112                 }
1113                 if (srose.srose_family != AF_ROSE)
1114                         return -EINVAL;
1115         } else {
1116                 if (sk->sk_state != TCP_ESTABLISHED)
1117                         return -ENOTCONN;
1118
1119                 srose.srose_family = AF_ROSE;
1120                 srose.srose_addr   = rose->dest_addr;
1121                 srose.srose_call   = rose->dest_call;
1122                 srose.srose_ndigis = rose->dest_ndigis;
1123                 for (n = 0 ; n < rose->dest_ndigis ; n++)
1124                         srose.srose_digis[n] = rose->dest_digis[n];
1125         }
1126
1127         /* Build a packet */
1128         /* Sanity check the packet size */
1129         if (len > 65535)
1130                 return -EMSGSIZE;
1131
1132         size = len + AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
1133
1134         if ((skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
1135                 return err;
1136
1137         skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN);
1138
1139         /*
1140          *      Put the data on the end
1141          */
1142
1143         skb_reset_transport_header(skb);
1144         skb_put(skb, len);
1145
1146         err = memcpy_from_msg(skb_transport_header(skb), msg, len);
1147         if (err) {
1148                 kfree_skb(skb);
1149                 return err;
1150         }
1151
1152         /*
1153          *      If the Q BIT Include socket option is in force, the first
1154          *      byte of the user data is the logical value of the Q Bit.
1155          */
1156         if (rose->qbitincl) {
1157                 qbit = skb->data[0];
1158                 skb_pull(skb, 1);
1159         }
1160
1161         /*
1162          *      Push down the ROSE header
1163          */
1164         asmptr = skb_push(skb, ROSE_MIN_LEN);
1165
1166         /* Build a ROSE Network header */
1167         asmptr[0] = ((rose->lci >> 8) & 0x0F) | ROSE_GFI;
1168         asmptr[1] = (rose->lci >> 0) & 0xFF;
1169         asmptr[2] = ROSE_DATA;
1170
1171         if (qbit)
1172                 asmptr[0] |= ROSE_Q_BIT;
1173
1174         if (sk->sk_state != TCP_ESTABLISHED) {
1175                 kfree_skb(skb);
1176                 return -ENOTCONN;
1177         }
1178
1179 #ifdef M_BIT
1180 #define ROSE_PACLEN (256-ROSE_MIN_LEN)
1181         if (skb->len - ROSE_MIN_LEN > ROSE_PACLEN) {
1182                 unsigned char header[ROSE_MIN_LEN];
1183                 struct sk_buff *skbn;
1184                 int frontlen;
1185                 int lg;
1186
1187                 /* Save a copy of the Header */
1188                 skb_copy_from_linear_data(skb, header, ROSE_MIN_LEN);
1189                 skb_pull(skb, ROSE_MIN_LEN);
1190
1191                 frontlen = skb_headroom(skb);
1192
1193                 while (skb->len > 0) {
1194                         if ((skbn = sock_alloc_send_skb(sk, frontlen + ROSE_PACLEN, 0, &err)) == NULL) {
1195                                 kfree_skb(skb);
1196                                 return err;
1197                         }
1198
1199                         skbn->sk   = sk;
1200                         skbn->free = 1;
1201                         skbn->arp  = 1;
1202
1203                         skb_reserve(skbn, frontlen);
1204
1205                         lg = (ROSE_PACLEN > skb->len) ? skb->len : ROSE_PACLEN;
1206
1207                         /* Copy the user data */
1208                         skb_copy_from_linear_data(skb, skb_put(skbn, lg), lg);
1209                         skb_pull(skb, lg);
1210
1211                         /* Duplicate the Header */
1212                         skb_push(skbn, ROSE_MIN_LEN);
1213                         skb_copy_to_linear_data(skbn, header, ROSE_MIN_LEN);
1214
1215                         if (skb->len > 0)
1216                                 skbn->data[2] |= M_BIT;
1217
1218                         skb_queue_tail(&sk->sk_write_queue, skbn); /* Throw it on the queue */
1219                 }
1220
1221                 skb->free = 1;
1222                 kfree_skb(skb);
1223         } else {
1224                 skb_queue_tail(&sk->sk_write_queue, skb);               /* Throw it on the queue */
1225         }
1226 #else
1227         skb_queue_tail(&sk->sk_write_queue, skb);       /* Shove it onto the queue */
1228 #endif
1229
1230         rose_kick(sk);
1231
1232         return len;
1233 }
1234
1235
1236 static int rose_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1237                         int flags)
1238 {
1239         struct sock *sk = sock->sk;
1240         struct rose_sock *rose = rose_sk(sk);
1241         size_t copied;
1242         unsigned char *asmptr;
1243         struct sk_buff *skb;
1244         int n, er, qbit;
1245
1246         /*
1247          * This works for seqpacket too. The receiver has ordered the queue for
1248          * us! We do one quick check first though
1249          */
1250         if (sk->sk_state != TCP_ESTABLISHED)
1251                 return -ENOTCONN;
1252
1253         /* Now we can treat all alike */
1254         skb = skb_recv_datagram(sk, flags, &er);
1255         if (!skb)
1256                 return er;
1257
1258         qbit = (skb->data[0] & ROSE_Q_BIT) == ROSE_Q_BIT;
1259
1260         skb_pull(skb, ROSE_MIN_LEN);
1261
1262         if (rose->qbitincl) {
1263                 asmptr  = skb_push(skb, 1);
1264                 *asmptr = qbit;
1265         }
1266
1267         skb_reset_transport_header(skb);
1268         copied     = skb->len;
1269
1270         if (copied > size) {
1271                 copied = size;
1272                 msg->msg_flags |= MSG_TRUNC;
1273         }
1274
1275         skb_copy_datagram_msg(skb, 0, msg, copied);
1276
1277         if (msg->msg_name) {
1278                 struct sockaddr_rose *srose;
1279                 DECLARE_SOCKADDR(struct full_sockaddr_rose *, full_srose,
1280                                  msg->msg_name);
1281
1282                 memset(msg->msg_name, 0, sizeof(struct full_sockaddr_rose));
1283                 srose = msg->msg_name;
1284                 srose->srose_family = AF_ROSE;
1285                 srose->srose_addr   = rose->dest_addr;
1286                 srose->srose_call   = rose->dest_call;
1287                 srose->srose_ndigis = rose->dest_ndigis;
1288                 for (n = 0 ; n < rose->dest_ndigis ; n++)
1289                         full_srose->srose_digis[n] = rose->dest_digis[n];
1290                 msg->msg_namelen = sizeof(struct full_sockaddr_rose);
1291         }
1292
1293         skb_free_datagram(sk, skb);
1294
1295         return copied;
1296 }
1297
1298
1299 static int rose_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1300 {
1301         struct sock *sk = sock->sk;
1302         struct rose_sock *rose = rose_sk(sk);
1303         void __user *argp = (void __user *)arg;
1304
1305         switch (cmd) {
1306         case TIOCOUTQ: {
1307                 long amount;
1308
1309                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1310                 if (amount < 0)
1311                         amount = 0;
1312                 return put_user(amount, (unsigned int __user *) argp);
1313         }
1314
1315         case TIOCINQ: {
1316                 struct sk_buff *skb;
1317                 long amount = 0L;
1318                 /* These two are safe on a single CPU system as only user tasks fiddle here */
1319                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1320                         amount = skb->len;
1321                 return put_user(amount, (unsigned int __user *) argp);
1322         }
1323
1324         case SIOCGIFADDR:
1325         case SIOCSIFADDR:
1326         case SIOCGIFDSTADDR:
1327         case SIOCSIFDSTADDR:
1328         case SIOCGIFBRDADDR:
1329         case SIOCSIFBRDADDR:
1330         case SIOCGIFNETMASK:
1331         case SIOCSIFNETMASK:
1332         case SIOCGIFMETRIC:
1333         case SIOCSIFMETRIC:
1334                 return -EINVAL;
1335
1336         case SIOCADDRT:
1337         case SIOCDELRT:
1338         case SIOCRSCLRRT:
1339                 if (!capable(CAP_NET_ADMIN))
1340                         return -EPERM;
1341                 return rose_rt_ioctl(cmd, argp);
1342
1343         case SIOCRSGCAUSE: {
1344                 struct rose_cause_struct rose_cause;
1345                 rose_cause.cause      = rose->cause;
1346                 rose_cause.diagnostic = rose->diagnostic;
1347                 return copy_to_user(argp, &rose_cause, sizeof(struct rose_cause_struct)) ? -EFAULT : 0;
1348         }
1349
1350         case SIOCRSSCAUSE: {
1351                 struct rose_cause_struct rose_cause;
1352                 if (copy_from_user(&rose_cause, argp, sizeof(struct rose_cause_struct)))
1353                         return -EFAULT;
1354                 rose->cause      = rose_cause.cause;
1355                 rose->diagnostic = rose_cause.diagnostic;
1356                 return 0;
1357         }
1358
1359         case SIOCRSSL2CALL:
1360                 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1361                 if (ax25cmp(&rose_callsign, &null_ax25_address) != 0)
1362                         ax25_listen_release(&rose_callsign, NULL);
1363                 if (copy_from_user(&rose_callsign, argp, sizeof(ax25_address)))
1364                         return -EFAULT;
1365                 if (ax25cmp(&rose_callsign, &null_ax25_address) != 0)
1366                         return ax25_listen_register(&rose_callsign, NULL);
1367
1368                 return 0;
1369
1370         case SIOCRSGL2CALL:
1371                 return copy_to_user(argp, &rose_callsign, sizeof(ax25_address)) ? -EFAULT : 0;
1372
1373         case SIOCRSACCEPT:
1374                 if (rose->state == ROSE_STATE_5) {
1375                         rose_write_internal(sk, ROSE_CALL_ACCEPTED);
1376                         rose_start_idletimer(sk);
1377                         rose->condition = 0x00;
1378                         rose->vs        = 0;
1379                         rose->va        = 0;
1380                         rose->vr        = 0;
1381                         rose->vl        = 0;
1382                         rose->state     = ROSE_STATE_3;
1383                 }
1384                 return 0;
1385
1386         default:
1387                 return -ENOIOCTLCMD;
1388         }
1389
1390         return 0;
1391 }
1392
1393 #ifdef CONFIG_PROC_FS
1394 static void *rose_info_start(struct seq_file *seq, loff_t *pos)
1395         __acquires(rose_list_lock)
1396 {
1397         spin_lock_bh(&rose_list_lock);
1398         return seq_hlist_start_head(&rose_list, *pos);
1399 }
1400
1401 static void *rose_info_next(struct seq_file *seq, void *v, loff_t *pos)
1402 {
1403         return seq_hlist_next(v, &rose_list, pos);
1404 }
1405
1406 static void rose_info_stop(struct seq_file *seq, void *v)
1407         __releases(rose_list_lock)
1408 {
1409         spin_unlock_bh(&rose_list_lock);
1410 }
1411
1412 static int rose_info_show(struct seq_file *seq, void *v)
1413 {
1414         char buf[11], rsbuf[11];
1415
1416         if (v == SEQ_START_TOKEN)
1417                 seq_puts(seq,
1418                          "dest_addr  dest_call src_addr   src_call  dev   lci neigh st vs vr va   t  t1  t2  t3  hb    idle Snd-Q Rcv-Q inode\n");
1419
1420         else {
1421                 struct sock *s = sk_entry(v);
1422                 struct rose_sock *rose = rose_sk(s);
1423                 const char *devname, *callsign;
1424                 const struct net_device *dev = rose->device;
1425
1426                 if (!dev)
1427                         devname = "???";
1428                 else
1429                         devname = dev->name;
1430
1431                 seq_printf(seq, "%-10s %-9s ",
1432                            rose2asc(rsbuf, &rose->dest_addr),
1433                            ax2asc(buf, &rose->dest_call));
1434
1435                 if (ax25cmp(&rose->source_call, &null_ax25_address) == 0)
1436                         callsign = "??????-?";
1437                 else
1438                         callsign = ax2asc(buf, &rose->source_call);
1439
1440                 seq_printf(seq,
1441                            "%-10s %-9s %-5s %3.3X %05d  %d  %d  %d  %d %3lu %3lu %3lu %3lu %3lu %3lu/%03lu %5d %5d %ld\n",
1442                         rose2asc(rsbuf, &rose->source_addr),
1443                         callsign,
1444                         devname,
1445                         rose->lci & 0x0FFF,
1446                         (rose->neighbour) ? rose->neighbour->number : 0,
1447                         rose->state,
1448                         rose->vs,
1449                         rose->vr,
1450                         rose->va,
1451                         ax25_display_timer(&rose->timer) / HZ,
1452                         rose->t1 / HZ,
1453                         rose->t2 / HZ,
1454                         rose->t3 / HZ,
1455                         rose->hb / HZ,
1456                         ax25_display_timer(&rose->idletimer) / (60 * HZ),
1457                         rose->idle / (60 * HZ),
1458                         sk_wmem_alloc_get(s),
1459                         sk_rmem_alloc_get(s),
1460                         s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
1461         }
1462
1463         return 0;
1464 }
1465
1466 static const struct seq_operations rose_info_seqops = {
1467         .start = rose_info_start,
1468         .next = rose_info_next,
1469         .stop = rose_info_stop,
1470         .show = rose_info_show,
1471 };
1472 #endif  /* CONFIG_PROC_FS */
1473
1474 static const struct net_proto_family rose_family_ops = {
1475         .family         =       PF_ROSE,
1476         .create         =       rose_create,
1477         .owner          =       THIS_MODULE,
1478 };
1479
1480 static const struct proto_ops rose_proto_ops = {
1481         .family         =       PF_ROSE,
1482         .owner          =       THIS_MODULE,
1483         .release        =       rose_release,
1484         .bind           =       rose_bind,
1485         .connect        =       rose_connect,
1486         .socketpair     =       sock_no_socketpair,
1487         .accept         =       rose_accept,
1488         .getname        =       rose_getname,
1489         .poll           =       datagram_poll,
1490         .ioctl          =       rose_ioctl,
1491         .gettstamp      =       sock_gettstamp,
1492         .listen         =       rose_listen,
1493         .shutdown       =       sock_no_shutdown,
1494         .setsockopt     =       rose_setsockopt,
1495         .getsockopt     =       rose_getsockopt,
1496         .sendmsg        =       rose_sendmsg,
1497         .recvmsg        =       rose_recvmsg,
1498         .mmap           =       sock_no_mmap,
1499 };
1500
1501 static struct notifier_block rose_dev_notifier = {
1502         .notifier_call  =       rose_device_event,
1503 };
1504
1505 static struct net_device **dev_rose;
1506
1507 static struct ax25_protocol rose_pid = {
1508         .pid    = AX25_P_ROSE,
1509         .func   = rose_route_frame
1510 };
1511
1512 static struct ax25_linkfail rose_linkfail_notifier = {
1513         .func   = rose_link_failed
1514 };
1515
1516 static int __init rose_proto_init(void)
1517 {
1518         int i;
1519         int rc;
1520
1521         if (rose_ndevs > 0x7FFFFFFF/sizeof(struct net_device *)) {
1522                 printk(KERN_ERR "ROSE: rose_proto_init - rose_ndevs parameter too large\n");
1523                 rc = -EINVAL;
1524                 goto out;
1525         }
1526
1527         rc = proto_register(&rose_proto, 0);
1528         if (rc != 0)
1529                 goto out;
1530
1531         rose_callsign = null_ax25_address;
1532
1533         dev_rose = kcalloc(rose_ndevs, sizeof(struct net_device *),
1534                            GFP_KERNEL);
1535         if (dev_rose == NULL) {
1536                 printk(KERN_ERR "ROSE: rose_proto_init - unable to allocate device structure\n");
1537                 rc = -ENOMEM;
1538                 goto out_proto_unregister;
1539         }
1540
1541         for (i = 0; i < rose_ndevs; i++) {
1542                 struct net_device *dev;
1543                 char name[IFNAMSIZ];
1544
1545                 sprintf(name, "rose%d", i);
1546                 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, rose_setup);
1547                 if (!dev) {
1548                         printk(KERN_ERR "ROSE: rose_proto_init - unable to allocate memory\n");
1549                         rc = -ENOMEM;
1550                         goto fail;
1551                 }
1552                 rc = register_netdev(dev);
1553                 if (rc) {
1554                         printk(KERN_ERR "ROSE: netdevice registration failed\n");
1555                         free_netdev(dev);
1556                         goto fail;
1557                 }
1558                 rose_set_lockdep_key(dev);
1559                 dev_rose[i] = dev;
1560         }
1561
1562         sock_register(&rose_family_ops);
1563         register_netdevice_notifier(&rose_dev_notifier);
1564
1565         ax25_register_pid(&rose_pid);
1566         ax25_linkfail_register(&rose_linkfail_notifier);
1567
1568 #ifdef CONFIG_SYSCTL
1569         rose_register_sysctl();
1570 #endif
1571         rose_loopback_init();
1572
1573         rose_add_loopback_neigh();
1574
1575         proc_create_seq("rose", 0444, init_net.proc_net, &rose_info_seqops);
1576         proc_create_seq("rose_neigh", 0444, init_net.proc_net,
1577                     &rose_neigh_seqops);
1578         proc_create_seq("rose_nodes", 0444, init_net.proc_net,
1579                     &rose_node_seqops);
1580         proc_create_seq("rose_routes", 0444, init_net.proc_net,
1581                     &rose_route_seqops);
1582 out:
1583         return rc;
1584 fail:
1585         while (--i >= 0) {
1586                 unregister_netdev(dev_rose[i]);
1587                 free_netdev(dev_rose[i]);
1588         }
1589         kfree(dev_rose);
1590 out_proto_unregister:
1591         proto_unregister(&rose_proto);
1592         goto out;
1593 }
1594 module_init(rose_proto_init);
1595
1596 module_param(rose_ndevs, int, 0);
1597 MODULE_PARM_DESC(rose_ndevs, "number of ROSE devices");
1598
1599 MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
1600 MODULE_DESCRIPTION("The amateur radio ROSE network layer protocol");
1601 MODULE_LICENSE("GPL");
1602 MODULE_ALIAS_NETPROTO(PF_ROSE);
1603
1604 static void __exit rose_exit(void)
1605 {
1606         int i;
1607
1608         remove_proc_entry("rose", init_net.proc_net);
1609         remove_proc_entry("rose_neigh", init_net.proc_net);
1610         remove_proc_entry("rose_nodes", init_net.proc_net);
1611         remove_proc_entry("rose_routes", init_net.proc_net);
1612         rose_loopback_clear();
1613
1614         rose_rt_free();
1615
1616         ax25_protocol_release(AX25_P_ROSE);
1617         ax25_linkfail_release(&rose_linkfail_notifier);
1618
1619         if (ax25cmp(&rose_callsign, &null_ax25_address) != 0)
1620                 ax25_listen_release(&rose_callsign, NULL);
1621
1622 #ifdef CONFIG_SYSCTL
1623         rose_unregister_sysctl();
1624 #endif
1625         unregister_netdevice_notifier(&rose_dev_notifier);
1626
1627         sock_unregister(PF_ROSE);
1628
1629         for (i = 0; i < rose_ndevs; i++) {
1630                 struct net_device *dev = dev_rose[i];
1631
1632                 if (dev) {
1633                         unregister_netdev(dev);
1634                         free_netdev(dev);
1635                 }
1636         }
1637
1638         kfree(dev_rose);
1639         proto_unregister(&rose_proto);
1640 }
1641
1642 module_exit(rose_exit);