net/llc/af

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This source file includes following definitions.
llc_ui_next_link_no
llc_proto_type
llc_ui_addr_null
llc_ui_header_len
llc_ui_send_data
llc_ui_sk_init
llc_ui_create
llc_ui_release
llc_ui_autoport
llc_ui_autobind
llc_ui_bind
llc_ui_shutdown
llc_ui_connect
llc_ui_listen
llc_ui_wait_for_disc
llc_ui_wait_for_conn
llc_ui_wait_for_busy_core
llc_wait_data
llc_cmsg_rcv
llc_ui_accept
llc_ui_recvmsg
llc_ui_sendmsg
llc_ui_getname
llc_ui_ioctl
llc_ui_setsockopt
llc_ui_getsockopt
llc2_init
llc2_exit
   1 /*
   2  * af_llc.c - LLC User Interface SAPs
   3  * Description:
   4  *   Functions in this module are implementation of socket based llc
   5  *   communications for the Linux operating system. Support of llc class
   6  *   one and class two is provided via SOCK_DGRAM and SOCK_STREAM
   7  *   respectively.
   8  *
   9  *   An llc2 connection is (mac + sap), only one llc2 sap connection
  10  *   is allowed per mac. Though one sap may have multiple mac + sap
  11  *   connections.
  12  *
  13  * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
  14  *               2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  15  *
  16  * This program can be redistributed or modified under the terms of the
  17  * GNU General Public License as published by the Free Software Foundation.
  18  * This program is distributed without any warranty or implied warranty
  19  * of merchantability or fitness for a particular purpose.
  20  *
  21  * See the GNU General Public License for more details.
  22  */
  23 #include <linux/compiler.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/rtnetlink.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/sched/signal.h>
  30 
  31 #include <net/llc.h>
  32 #include <net/llc_sap.h>
  33 #include <net/llc_pdu.h>
  34 #include <net/llc_conn.h>
  35 #include <net/tcp_states.h>
  36 
  37 /* remember: uninitialized global data is zeroed because its in .bss */
  38 static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
  39 static u16 llc_ui_sap_link_no_max[256];
  40 static struct sockaddr_llc llc_ui_addrnull;
  41 static const struct proto_ops llc_ui_ops;
  42 
  43 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout);
  44 static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
  45 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
  46 
  47 #if 0
  48 #define dprintk(args...) printk(KERN_DEBUG args)
  49 #else
  50 #define dprintk(args...)
  51 #endif
  52 
  53 /* Maybe we'll add some more in the future. */
  54 #define LLC_CMSG_PKTINFO        1
  55 
  56 
  57 /**
  58  *      llc_ui_next_link_no - return the next unused link number for a sap
  59  *      @sap: Address of sap to get link number from.
  60  *
  61  *      Return the next unused link number for a given sap.
  62  */
  63 static inline u16 llc_ui_next_link_no(int sap)
  64 {
  65         return llc_ui_sap_link_no_max[sap]++;
  66 }
  67 
  68 /**
  69  *      llc_proto_type - return eth protocol for ARP header type
  70  *      @arphrd: ARP header type.
  71  *
  72  *      Given an ARP header type return the corresponding ethernet protocol.
  73  */
  74 static inline __be16 llc_proto_type(u16 arphrd)
  75 {
  76         return htons(ETH_P_802_2);
  77 }
  78 
  79 /**
  80  *      llc_ui_addr_null - determines if a address structure is null
  81  *      @addr: Address to test if null.
  82  */
  83 static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
  84 {
  85         return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
  86 }
  87 
  88 /**
  89  *      llc_ui_header_len - return length of llc header based on operation
  90  *      @sk: Socket which contains a valid llc socket type.
  91  *      @addr: Complete sockaddr_llc structure received from the user.
  92  *
  93  *      Provide the length of the llc header depending on what kind of
  94  *      operation the user would like to perform and the type of socket.
  95  *      Returns the correct llc header length.
  96  */
  97 static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
  98 {
  99         u8 rc = LLC_PDU_LEN_U;
 100 
 101         if (addr->sllc_test || addr->sllc_xid)
 102                 rc = LLC_PDU_LEN_U;
 103         else if (sk->sk_type == SOCK_STREAM)
 104                 rc = LLC_PDU_LEN_I;
 105         return rc;
 106 }
 107 
 108 /**
 109  *      llc_ui_send_data - send data via reliable llc2 connection
 110  *      @sk: Connection the socket is using.
 111  *      @skb: Data the user wishes to send.
 112  *      @noblock: can we block waiting for data?
 113  *
 114  *      Send data via reliable llc2 connection.
 115  *      Returns 0 upon success, non-zero if action did not succeed.
 116  *
 117  *      This function always consumes a reference to the skb.
 118  */
 119 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
 120 {
 121         struct llc_sock* llc = llc_sk(sk);
 122 
 123         if (unlikely(llc_data_accept_state(llc->state) ||
 124                      llc->remote_busy_flag ||
 125                      llc->p_flag)) {
 126                 long timeout = sock_sndtimeo(sk, noblock);
 127                 int rc;
 128 
 129                 rc = llc_ui_wait_for_busy_core(sk, timeout);
 130                 if (rc) {
 131                         kfree_skb(skb);
 132                         return rc;
 133                 }
 134         }
 135         return llc_build_and_send_pkt(sk, skb);
 136 }
 137 
 138 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
 139 {
 140         sock_graft(sk, sock);
 141         sk->sk_type     = sock->type;
 142         sock->ops       = &llc_ui_ops;
 143 }
 144 
 145 static struct proto llc_proto = {
 146         .name     = "LLC",
 147         .owner    = THIS_MODULE,
 148         .obj_size = sizeof(struct llc_sock),
 149         .slab_flags = SLAB_TYPESAFE_BY_RCU,
 150 };
 151 
 152 /**
 153  *      llc_ui_create - alloc and init a new llc_ui socket
 154  *      @net: network namespace (must be default network)
 155  *      @sock: Socket to initialize and attach allocated sk to.
 156  *      @protocol: Unused.
 157  *      @kern: on behalf of kernel or userspace
 158  *
 159  *      Allocate and initialize a new llc_ui socket, validate the user wants a
 160  *      socket type we have available.
 161  *      Returns 0 upon success, negative upon failure.
 162  */
 163 static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
 164                          int kern)
 165 {
 166         struct sock *sk;
 167         int rc = -ESOCKTNOSUPPORT;
 168 
 169         if (!ns_capable(net->user_ns, CAP_NET_RAW))
 170                 return -EPERM;
 171 
 172         if (!net_eq(net, &init_net))
 173                 return -EAFNOSUPPORT;
 174 
 175         if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
 176                 rc = -ENOMEM;
 177                 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern);
 178                 if (sk) {
 179                         rc = 0;
 180                         llc_ui_sk_init(sock, sk);
 181                 }
 182         }
 183         return rc;
 184 }
 185 
 186 /**
 187  *      llc_ui_release - shutdown socket
 188  *      @sock: Socket to release.
 189  *
 190  *      Shutdown and deallocate an existing socket.
 191  */
 192 static int llc_ui_release(struct socket *sock)
 193 {
 194         struct sock *sk = sock->sk;
 195         struct llc_sock *llc;
 196 
 197         if (unlikely(sk == NULL))
 198                 goto out;
 199         sock_hold(sk);
 200         lock_sock(sk);
 201         llc = llc_sk(sk);
 202         dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
 203                 llc->laddr.lsap, llc->daddr.lsap);
 204         if (!llc_send_disc(sk))
 205                 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
 206         if (!sock_flag(sk, SOCK_ZAPPED)) {
 207                 struct llc_sap *sap = llc->sap;
 208 
 209                 /* Hold this for release_sock(), so that llc_backlog_rcv()
 210                  * could still use it.
 211                  */
 212                 llc_sap_hold(sap);
 213                 llc_sap_remove_socket(llc->sap, sk);
 214                 release_sock(sk);
 215                 llc_sap_put(sap);
 216         } else {
 217                 release_sock(sk);
 218         }
 219         if (llc->dev)
 220                 dev_put(llc->dev);
 221         sock_put(sk);
 222         llc_sk_free(sk);
 223 out:
 224         return 0;
 225 }
 226 
 227 /**
 228  *      llc_ui_autoport - provide dynamically allocate SAP number
 229  *
 230  *      Provide the caller with a dynamically allocated SAP number according
 231  *      to the rules that are set in this function. Returns: 0, upon failure,
 232  *      SAP number otherwise.
 233  */
 234 static int llc_ui_autoport(void)
 235 {
 236         struct llc_sap *sap;
 237         int i, tries = 0;
 238 
 239         while (tries < LLC_SAP_DYN_TRIES) {
 240                 for (i = llc_ui_sap_last_autoport;
 241                      i < LLC_SAP_DYN_STOP; i += 2) {
 242                         sap = llc_sap_find(i);
 243                         if (!sap) {
 244                                 llc_ui_sap_last_autoport = i + 2;
 245                                 goto out;
 246                         }
 247                         llc_sap_put(sap);
 248                 }
 249                 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
 250                 tries++;
 251         }
 252         i = 0;
 253 out:
 254         return i;
 255 }
 256 
 257 /**
 258  *      llc_ui_autobind - automatically bind a socket to a sap
 259  *      @sock: socket to bind
 260  *      @addr: address to connect to
 261  *
 262  *      Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
 263  *      specifically used llc_ui_bind to bind to an specific address/sap
 264  *
 265  *      Returns: 0 upon success, negative otherwise.
 266  */
 267 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
 268 {
 269         struct sock *sk = sock->sk;
 270         struct llc_sock *llc = llc_sk(sk);
 271         struct llc_sap *sap;
 272         int rc = -EINVAL;
 273 
 274         if (!sock_flag(sk, SOCK_ZAPPED))
 275                 goto out;
 276         rc = -ENODEV;
 277         if (sk->sk_bound_dev_if) {
 278                 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
 279                 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
 280                         dev_put(llc->dev);
 281                         llc->dev = NULL;
 282                 }
 283         } else
 284                 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
 285         if (!llc->dev)
 286                 goto out;
 287         rc = -EUSERS;
 288         llc->laddr.lsap = llc_ui_autoport();
 289         if (!llc->laddr.lsap)
 290                 goto out;
 291         rc = -EBUSY; /* some other network layer is using the sap */
 292         sap = llc_sap_open(llc->laddr.lsap, NULL);
 293         if (!sap)
 294                 goto out;
 295         memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
 296         memcpy(&llc->addr, addr, sizeof(llc->addr));
 297         /* assign new connection to its SAP */
 298         llc_sap_add_socket(sap, sk);
 299         sock_reset_flag(sk, SOCK_ZAPPED);
 300         rc = 0;
 301 out:
 302         return rc;
 303 }
 304 
 305 /**
 306  *      llc_ui_bind - bind a socket to a specific address.
 307  *      @sock: Socket to bind an address to.
 308  *      @uaddr: Address the user wants the socket bound to.
 309  *      @addrlen: Length of the uaddr structure.
 310  *
 311  *      Bind a socket to a specific address. For llc a user is able to bind to
 312  *      a specific sap only or mac + sap.
 313  *      If the user desires to bind to a specific mac + sap, it is possible to
 314  *      have multiple sap connections via multiple macs.
 315  *      Bind and autobind for that matter must enforce the correct sap usage
 316  *      otherwise all hell will break loose.
 317  *      Returns: 0 upon success, negative otherwise.
 318  */
 319 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
 320 {
 321         struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
 322         struct sock *sk = sock->sk;
 323         struct llc_sock *llc = llc_sk(sk);
 324         struct llc_sap *sap;
 325         int rc = -EINVAL;
 326 
 327         lock_sock(sk);
 328         if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
 329                 goto out;
 330         rc = -EAFNOSUPPORT;
 331         if (unlikely(addr->sllc_family != AF_LLC))
 332                 goto out;
 333         dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
 334         rc = -ENODEV;
 335         rcu_read_lock();
 336         if (sk->sk_bound_dev_if) {
 337                 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
 338                 if (llc->dev) {
 339                         if (!addr->sllc_arphrd)
 340                                 addr->sllc_arphrd = llc->dev->type;
 341                         if (is_zero_ether_addr(addr->sllc_mac))
 342                                 memcpy(addr->sllc_mac, llc->dev->dev_addr,
 343                                        IFHWADDRLEN);
 344                         if (addr->sllc_arphrd != llc->dev->type ||
 345                             !ether_addr_equal(addr->sllc_mac,
 346                                               llc->dev->dev_addr)) {
 347                                 rc = -EINVAL;
 348                                 llc->dev = NULL;
 349                         }
 350                 }
 351         } else
 352                 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
 353                                            addr->sllc_mac);
 354         if (llc->dev)
 355                 dev_hold(llc->dev);
 356         rcu_read_unlock();
 357         if (!llc->dev)
 358                 goto out;
 359         if (!addr->sllc_sap) {
 360                 rc = -EUSERS;
 361                 addr->sllc_sap = llc_ui_autoport();
 362                 if (!addr->sllc_sap)
 363                         goto out;
 364         }
 365         sap = llc_sap_find(addr->sllc_sap);
 366         if (!sap) {
 367                 sap = llc_sap_open(addr->sllc_sap, NULL);
 368                 rc = -EBUSY; /* some other network layer is using the sap */
 369                 if (!sap)
 370                         goto out;
 371         } else {
 372                 struct llc_addr laddr, daddr;
 373                 struct sock *ask;
 374 
 375                 memset(&laddr, 0, sizeof(laddr));
 376                 memset(&daddr, 0, sizeof(daddr));
 377                 /*
 378                  * FIXME: check if the address is multicast,
 379                  *        only SOCK_DGRAM can do this.
 380                  */
 381                 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
 382                 laddr.lsap = addr->sllc_sap;
 383                 rc = -EADDRINUSE; /* mac + sap clash. */
 384                 ask = llc_lookup_established(sap, &daddr, &laddr);
 385                 if (ask) {
 386                         sock_put(ask);
 387                         goto out_put;
 388                 }
 389         }
 390         llc->laddr.lsap = addr->sllc_sap;
 391         memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
 392         memcpy(&llc->addr, addr, sizeof(llc->addr));
 393         /* assign new connection to its SAP */
 394         llc_sap_add_socket(sap, sk);
 395         sock_reset_flag(sk, SOCK_ZAPPED);
 396         rc = 0;
 397 out_put:
 398         llc_sap_put(sap);
 399 out:
 400         release_sock(sk);
 401         return rc;
 402 }
 403 
 404 /**
 405  *      llc_ui_shutdown - shutdown a connect llc2 socket.
 406  *      @sock: Socket to shutdown.
 407  *      @how: What part of the socket to shutdown.
 408  *
 409  *      Shutdown a connected llc2 socket. Currently this function only supports
 410  *      shutting down both sends and receives (2), we could probably make this
 411  *      function such that a user can shutdown only half the connection but not
 412  *      right now.
 413  *      Returns: 0 upon success, negative otherwise.
 414  */
 415 static int llc_ui_shutdown(struct socket *sock, int how)
 416 {
 417         struct sock *sk = sock->sk;
 418         int rc = -ENOTCONN;
 419 
 420         lock_sock(sk);
 421         if (unlikely(sk->sk_state != TCP_ESTABLISHED))
 422                 goto out;
 423         rc = -EINVAL;
 424         if (how != 2)
 425                 goto out;
 426         rc = llc_send_disc(sk);
 427         if (!rc)
 428                 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
 429         /* Wake up anyone sleeping in poll */
 430         sk->sk_state_change(sk);
 431 out:
 432         release_sock(sk);
 433         return rc;
 434 }
 435 
 436 /**
 437  *      llc_ui_connect - Connect to a remote llc2 mac + sap.
 438  *      @sock: Socket which will be connected to the remote destination.
 439  *      @uaddr: Remote and possibly the local address of the new connection.
 440  *      @addrlen: Size of uaddr structure.
 441  *      @flags: Operational flags specified by the user.
 442  *
 443  *      Connect to a remote llc2 mac + sap. The caller must specify the
 444  *      destination mac and address to connect to. If the user hasn't previously
 445  *      called bind(2) with a smac the address of the first interface of the
 446  *      specified arp type will be used.
 447  *      This function will autobind if user did not previously call bind.
 448  *      Returns: 0 upon success, negative otherwise.
 449  */
 450 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
 451                           int addrlen, int flags)
 452 {
 453         struct sock *sk = sock->sk;
 454         struct llc_sock *llc = llc_sk(sk);
 455         struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
 456         int rc = -EINVAL;
 457 
 458         lock_sock(sk);
 459         if (unlikely(addrlen != sizeof(*addr)))
 460                 goto out;
 461         rc = -EAFNOSUPPORT;
 462         if (unlikely(addr->sllc_family != AF_LLC))
 463                 goto out;
 464         if (unlikely(sk->sk_type != SOCK_STREAM))
 465                 goto out;
 466         rc = -EALREADY;
 467         if (unlikely(sock->state == SS_CONNECTING))
 468                 goto out;
 469         /* bind connection to sap if user hasn't done it. */
 470         if (sock_flag(sk, SOCK_ZAPPED)) {
 471                 /* bind to sap with null dev, exclusive */
 472                 rc = llc_ui_autobind(sock, addr);
 473                 if (rc)
 474                         goto out;
 475         }
 476         llc->daddr.lsap = addr->sllc_sap;
 477         memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
 478         sock->state = SS_CONNECTING;
 479         sk->sk_state   = TCP_SYN_SENT;
 480         llc->link   = llc_ui_next_link_no(llc->sap->laddr.lsap);
 481         rc = llc_establish_connection(sk, llc->dev->dev_addr,
 482                                       addr->sllc_mac, addr->sllc_sap);
 483         if (rc) {
 484                 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
 485                 sock->state  = SS_UNCONNECTED;
 486                 sk->sk_state = TCP_CLOSE;
 487                 goto out;
 488         }
 489 
 490         if (sk->sk_state == TCP_SYN_SENT) {
 491                 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 492 
 493                 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
 494                         goto out;
 495 
 496                 rc = sock_intr_errno(timeo);
 497                 if (signal_pending(current))
 498                         goto out;
 499         }
 500 
 501         if (sk->sk_state == TCP_CLOSE)
 502                 goto sock_error;
 503 
 504         sock->state = SS_CONNECTED;
 505         rc = 0;
 506 out:
 507         release_sock(sk);
 508         return rc;
 509 sock_error:
 510         rc = sock_error(sk) ? : -ECONNABORTED;
 511         sock->state = SS_UNCONNECTED;
 512         goto out;
 513 }
 514 
 515 /**
 516  *      llc_ui_listen - allow a normal socket to accept incoming connections
 517  *      @sock: Socket to allow incoming connections on.
 518  *      @backlog: Number of connections to queue.
 519  *
 520  *      Allow a normal socket to accept incoming connections.
 521  *      Returns 0 upon success, negative otherwise.
 522  */
 523 static int llc_ui_listen(struct socket *sock, int backlog)
 524 {
 525         struct sock *sk = sock->sk;
 526         int rc = -EINVAL;
 527 
 528         lock_sock(sk);
 529         if (unlikely(sock->state != SS_UNCONNECTED))
 530                 goto out;
 531         rc = -EOPNOTSUPP;
 532         if (unlikely(sk->sk_type != SOCK_STREAM))
 533                 goto out;
 534         rc = -EAGAIN;
 535         if (sock_flag(sk, SOCK_ZAPPED))
 536                 goto out;
 537         rc = 0;
 538         if (!(unsigned int)backlog)     /* BSDism */
 539                 backlog = 1;
 540         sk->sk_max_ack_backlog = backlog;
 541         if (sk->sk_state != TCP_LISTEN) {
 542                 sk->sk_ack_backlog = 0;
 543                 sk->sk_state       = TCP_LISTEN;
 544         }
 545         sk->sk_socket->flags |= __SO_ACCEPTCON;
 546 out:
 547         release_sock(sk);
 548         return rc;
 549 }
 550 
 551 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
 552 {
 553         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 554         int rc = 0;
 555 
 556         add_wait_queue(sk_sleep(sk), &wait);
 557         while (1) {
 558                 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
 559                         break;
 560                 rc = -ERESTARTSYS;
 561                 if (signal_pending(current))
 562                         break;
 563                 rc = -EAGAIN;
 564                 if (!timeout)
 565                         break;
 566                 rc = 0;
 567         }
 568         remove_wait_queue(sk_sleep(sk), &wait);
 569         return rc;
 570 }
 571 
 572 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
 573 {
 574         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 575 
 576         add_wait_queue(sk_sleep(sk), &wait);
 577         while (1) {
 578                 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait))
 579                         break;
 580                 if (signal_pending(current) || !timeout)
 581                         break;
 582         }
 583         remove_wait_queue(sk_sleep(sk), &wait);
 584         return timeout;
 585 }
 586 
 587 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
 588 {
 589         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 590         struct llc_sock *llc = llc_sk(sk);
 591         int rc;
 592 
 593         add_wait_queue(sk_sleep(sk), &wait);
 594         while (1) {
 595                 rc = 0;
 596                 if (sk_wait_event(sk, &timeout,
 597                                   (sk->sk_shutdown & RCV_SHUTDOWN) ||
 598                                   (!llc_data_accept_state(llc->state) &&
 599                                    !llc->remote_busy_flag &&
 600                                    !llc->p_flag), &wait))
 601                         break;
 602                 rc = -ERESTARTSYS;
 603                 if (signal_pending(current))
 604                         break;
 605                 rc = -EAGAIN;
 606                 if (!timeout)
 607                         break;
 608         }
 609         remove_wait_queue(sk_sleep(sk), &wait);
 610         return rc;
 611 }
 612 
 613 static int llc_wait_data(struct sock *sk, long timeo)
 614 {
 615         int rc;
 616 
 617         while (1) {
 618                 /*
 619                  * POSIX 1003.1g mandates this order.
 620                  */
 621                 rc = sock_error(sk);
 622                 if (rc)
 623                         break;
 624                 rc = 0;
 625                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 626                         break;
 627                 rc = -EAGAIN;
 628                 if (!timeo)
 629                         break;
 630                 rc = sock_intr_errno(timeo);
 631                 if (signal_pending(current))
 632                         break;
 633                 rc = 0;
 634                 if (sk_wait_data(sk, &timeo, NULL))
 635                         break;
 636         }
 637         return rc;
 638 }
 639 
 640 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
 641 {
 642         struct llc_sock *llc = llc_sk(skb->sk);
 643 
 644         if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
 645                 struct llc_pktinfo info;
 646 
 647                 memset(&info, 0, sizeof(info));
 648                 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
 649                 llc_pdu_decode_dsap(skb, &info.lpi_sap);
 650                 llc_pdu_decode_da(skb, info.lpi_mac);
 651                 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
 652         }
 653 }
 654 
 655 /**
 656  *      llc_ui_accept - accept a new incoming connection.
 657  *      @sock: Socket which connections arrive on.
 658  *      @newsock: Socket to move incoming connection to.
 659  *      @flags: User specified operational flags.
 660  *      @kern: If the socket is kernel internal
 661  *
 662  *      Accept a new incoming connection.
 663  *      Returns 0 upon success, negative otherwise.
 664  */
 665 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags,
 666                          bool kern)
 667 {
 668         struct sock *sk = sock->sk, *newsk;
 669         struct llc_sock *llc, *newllc;
 670         struct sk_buff *skb;
 671         int rc = -EOPNOTSUPP;
 672 
 673         dprintk("%s: accepting on %02X\n", __func__,
 674                 llc_sk(sk)->laddr.lsap);
 675         lock_sock(sk);
 676         if (unlikely(sk->sk_type != SOCK_STREAM))
 677                 goto out;
 678         rc = -EINVAL;
 679         if (unlikely(sock->state != SS_UNCONNECTED ||
 680                      sk->sk_state != TCP_LISTEN))
 681                 goto out;
 682         /* wait for a connection to arrive. */
 683         if (skb_queue_empty(&sk->sk_receive_queue)) {
 684                 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
 685                 if (rc)
 686                         goto out;
 687         }
 688         dprintk("%s: got a new connection on %02X\n", __func__,
 689                 llc_sk(sk)->laddr.lsap);
 690         skb = skb_dequeue(&sk->sk_receive_queue);
 691         rc = -EINVAL;
 692         if (!skb->sk)
 693                 goto frees;
 694         rc = 0;
 695         newsk = skb->sk;
 696         /* attach connection to a new socket. */
 697         llc_ui_sk_init(newsock, newsk);
 698         sock_reset_flag(newsk, SOCK_ZAPPED);
 699         newsk->sk_state         = TCP_ESTABLISHED;
 700         newsock->state          = SS_CONNECTED;
 701         llc                     = llc_sk(sk);
 702         newllc                  = llc_sk(newsk);
 703         memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
 704         newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
 705 
 706         /* put original socket back into a clean listen state. */
 707         sk->sk_state = TCP_LISTEN;
 708         sk->sk_ack_backlog--;
 709         dprintk("%s: ok success on %02X, client on %02X\n", __func__,
 710                 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
 711 frees:
 712         kfree_skb(skb);
 713 out:
 714         release_sock(sk);
 715         return rc;
 716 }
 717 
 718 /**
 719  *      llc_ui_recvmsg - copy received data to the socket user.
 720  *      @sock: Socket to copy data from.
 721  *      @msg: Various user space related information.
 722  *      @len: Size of user buffer.
 723  *      @flags: User specified flags.
 724  *
 725  *      Copy received data to the socket user.
 726  *      Returns non-negative upon success, negative otherwise.
 727  */
 728 static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
 729                           int flags)
 730 {
 731         DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
 732         const int nonblock = flags & MSG_DONTWAIT;
 733         struct sk_buff *skb = NULL;
 734         struct sock *sk = sock->sk;
 735         struct llc_sock *llc = llc_sk(sk);
 736         size_t copied = 0;
 737         u32 peek_seq = 0;
 738         u32 *seq, skb_len;
 739         unsigned long used;
 740         int target;     /* Read at least this many bytes */
 741         long timeo;
 742 
 743         lock_sock(sk);
 744         copied = -ENOTCONN;
 745         if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
 746                 goto out;
 747 
 748         timeo = sock_rcvtimeo(sk, nonblock);
 749 
 750         seq = &llc->copied_seq;
 751         if (flags & MSG_PEEK) {
 752                 peek_seq = llc->copied_seq;
 753                 seq = &peek_seq;
 754         }
 755 
 756         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
 757         copied = 0;
 758 
 759         do {
 760                 u32 offset;
 761 
 762                 /*
 763                  * We need to check signals first, to get correct SIGURG
 764                  * handling. FIXME: Need to check this doesn't impact 1003.1g
 765                  * and move it down to the bottom of the loop
 766                  */
 767                 if (signal_pending(current)) {
 768                         if (copied)
 769                                 break;
 770                         copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
 771                         break;
 772                 }
 773 
 774                 /* Next get a buffer. */
 775 
 776                 skb = skb_peek(&sk->sk_receive_queue);
 777                 if (skb) {
 778                         offset = *seq;
 779                         goto found_ok_skb;
 780                 }
 781                 /* Well, if we have backlog, try to process it now yet. */
 782 
 783                 if (copied >= target && !sk->sk_backlog.tail)
 784                         break;
 785 
 786                 if (copied) {
 787                         if (sk->sk_err ||
 788                             sk->sk_state == TCP_CLOSE ||
 789                             (sk->sk_shutdown & RCV_SHUTDOWN) ||
 790                             !timeo ||
 791                             (flags & MSG_PEEK))
 792                                 break;
 793                 } else {
 794                         if (sock_flag(sk, SOCK_DONE))
 795                                 break;
 796 
 797                         if (sk->sk_err) {
 798                                 copied = sock_error(sk);
 799                                 break;
 800                         }
 801                         if (sk->sk_shutdown & RCV_SHUTDOWN)
 802                                 break;
 803 
 804                         if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
 805                                 if (!sock_flag(sk, SOCK_DONE)) {
 806                                         /*
 807                                          * This occurs when user tries to read
 808                                          * from never connected socket.
 809                                          */
 810                                         copied = -ENOTCONN;
 811                                         break;
 812                                 }
 813                                 break;
 814                         }
 815                         if (!timeo) {
 816                                 copied = -EAGAIN;
 817                                 break;
 818                         }
 819                 }
 820 
 821                 if (copied >= target) { /* Do not sleep, just process backlog. */
 822                         release_sock(sk);
 823                         lock_sock(sk);
 824                 } else
 825                         sk_wait_data(sk, &timeo, NULL);
 826 
 827                 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
 828                         net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
 829                                             current->comm,
 830                                             task_pid_nr(current));
 831                         peek_seq = llc->copied_seq;
 832                 }
 833                 continue;
 834         found_ok_skb:
 835                 skb_len = skb->len;
 836                 /* Ok so how much can we use? */
 837                 used = skb->len - offset;
 838                 if (len < used)
 839                         used = len;
 840 
 841                 if (!(flags & MSG_TRUNC)) {
 842                         int rc = skb_copy_datagram_msg(skb, offset, msg, used);
 843                         if (rc) {
 844                                 /* Exception. Bailout! */
 845                                 if (!copied)
 846                                         copied = -EFAULT;
 847                                 break;
 848                         }
 849                 }
 850 
 851                 *seq += used;
 852                 copied += used;
 853                 len -= used;
 854 
 855                 /* For non stream protcols we get one packet per recvmsg call */
 856                 if (sk->sk_type != SOCK_STREAM)
 857                         goto copy_uaddr;
 858 
 859                 if (!(flags & MSG_PEEK)) {
 860                         skb_unlink(skb, &sk->sk_receive_queue);
 861                         kfree_skb(skb);
 862                         *seq = 0;
 863                 }
 864 
 865                 /* Partial read */
 866                 if (used + offset < skb_len)
 867                         continue;
 868         } while (len > 0);
 869 
 870 out:
 871         release_sock(sk);
 872         return copied;
 873 copy_uaddr:
 874         if (uaddr != NULL && skb != NULL) {
 875                 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
 876                 msg->msg_namelen = sizeof(*uaddr);
 877         }
 878         if (llc_sk(sk)->cmsg_flags)
 879                 llc_cmsg_rcv(msg, skb);
 880 
 881         if (!(flags & MSG_PEEK)) {
 882                 skb_unlink(skb, &sk->sk_receive_queue);
 883                 kfree_skb(skb);
 884                 *seq = 0;
 885         }
 886 
 887         goto out;
 888 }
 889 
 890 /**
 891  *      llc_ui_sendmsg - Transmit data provided by the socket user.
 892  *      @sock: Socket to transmit data from.
 893  *      @msg: Various user related information.
 894  *      @len: Length of data to transmit.
 895  *
 896  *      Transmit data provided by the socket user.
 897  *      Returns non-negative upon success, negative otherwise.
 898  */
 899 static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
 900 {
 901         struct sock *sk = sock->sk;
 902         struct llc_sock *llc = llc_sk(sk);
 903         DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
 904         int flags = msg->msg_flags;
 905         int noblock = flags & MSG_DONTWAIT;
 906         struct sk_buff *skb = NULL;
 907         size_t size = 0;
 908         int rc = -EINVAL, copied = 0, hdrlen;
 909 
 910         dprintk("%s: sending from %02X to %02X\n", __func__,
 911                 llc->laddr.lsap, llc->daddr.lsap);
 912         lock_sock(sk);
 913         if (addr) {
 914                 if (msg->msg_namelen < sizeof(*addr))
 915                         goto out;
 916         } else {
 917                 if (llc_ui_addr_null(&llc->addr))
 918                         goto out;
 919                 addr = &llc->addr;
 920         }
 921         /* must bind connection to sap if user hasn't done it. */
 922         if (sock_flag(sk, SOCK_ZAPPED)) {
 923                 /* bind to sap with null dev, exclusive. */
 924                 rc = llc_ui_autobind(sock, addr);
 925                 if (rc)
 926                         goto out;
 927         }
 928         hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
 929         size = hdrlen + len;
 930         if (size > llc->dev->mtu)
 931                 size = llc->dev->mtu;
 932         copied = size - hdrlen;
 933         rc = -EINVAL;
 934         if (copied < 0)
 935                 goto out;
 936         release_sock(sk);
 937         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
 938         lock_sock(sk);
 939         if (!skb)
 940                 goto out;
 941         skb->dev      = llc->dev;
 942         skb->protocol = llc_proto_type(addr->sllc_arphrd);
 943         skb_reserve(skb, hdrlen);
 944         rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
 945         if (rc)
 946                 goto out;
 947         if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
 948                 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
 949                                           addr->sllc_sap);
 950                 skb = NULL;
 951                 goto out;
 952         }
 953         if (addr->sllc_test) {
 954                 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
 955                                             addr->sllc_sap);
 956                 skb = NULL;
 957                 goto out;
 958         }
 959         if (addr->sllc_xid) {
 960                 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
 961                                            addr->sllc_sap);
 962                 skb = NULL;
 963                 goto out;
 964         }
 965         rc = -ENOPROTOOPT;
 966         if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
 967                 goto out;
 968         rc = llc_ui_send_data(sk, skb, noblock);
 969         skb = NULL;
 970 out:
 971         kfree_skb(skb);
 972         if (rc)
 973                 dprintk("%s: failed sending from %02X to %02X: %d\n",
 974                         __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
 975         release_sock(sk);
 976         return rc ? : copied;
 977 }
 978 
 979 /**
 980  *      llc_ui_getname - return the address info of a socket
 981  *      @sock: Socket to get address of.
 982  *      @uaddr: Address structure to return information.
 983  *      @uaddrlen: Length of address structure.
 984  *      @peer: Does user want local or remote address information.
 985  *
 986  *      Return the address information of a socket.
 987  */
 988 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
 989                           int peer)
 990 {
 991         struct sockaddr_llc sllc;
 992         struct sock *sk = sock->sk;
 993         struct llc_sock *llc = llc_sk(sk);
 994         int rc = -EBADF;
 995 
 996         memset(&sllc, 0, sizeof(sllc));
 997         lock_sock(sk);
 998         if (sock_flag(sk, SOCK_ZAPPED))
 999                 goto out;
1000         if (peer) {
1001                 rc = -ENOTCONN;
1002                 if (sk->sk_state != TCP_ESTABLISHED)
1003                         goto out;
1004                 if(llc->dev)
1005                         sllc.sllc_arphrd = llc->dev->type;
1006                 sllc.sllc_sap = llc->daddr.lsap;
1007                 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
1008         } else {
1009                 rc = -EINVAL;
1010                 if (!llc->sap)
1011                         goto out;
1012                 sllc.sllc_sap = llc->sap->laddr.lsap;
1013 
1014                 if (llc->dev) {
1015                         sllc.sllc_arphrd = llc->dev->type;
1016                         memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
1017                                IFHWADDRLEN);
1018                 }
1019         }
1020         sllc.sllc_family = AF_LLC;
1021         memcpy(uaddr, &sllc, sizeof(sllc));
1022         rc = sizeof(sllc);
1023 out:
1024         release_sock(sk);
1025         return rc;
1026 }
1027 
1028 /**
1029  *      llc_ui_ioctl - io controls for PF_LLC
1030  *      @sock: Socket to get/set info
1031  *      @cmd: command
1032  *      @arg: optional argument for cmd
1033  *
1034  *      get/set info on llc sockets
1035  */
1036 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1037                         unsigned long arg)
1038 {
1039         return -ENOIOCTLCMD;
1040 }
1041 
1042 /**
1043  *      llc_ui_setsockopt - set various connection specific parameters.
1044  *      @sock: Socket to set options on.
1045  *      @level: Socket level user is requesting operations on.
1046  *      @optname: Operation name.
1047  *      @optval: User provided operation data.
1048  *      @optlen: Length of optval.
1049  *
1050  *      Set various connection specific parameters.
1051  */
1052 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1053                              char __user *optval, unsigned int optlen)
1054 {
1055         struct sock *sk = sock->sk;
1056         struct llc_sock *llc = llc_sk(sk);
1057         unsigned int opt;
1058         int rc = -EINVAL;
1059 
1060         lock_sock(sk);
1061         if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1062                 goto out;
1063         rc = get_user(opt, (int __user *)optval);
1064         if (rc)
1065                 goto out;
1066         rc = -EINVAL;
1067         switch (optname) {
1068         case LLC_OPT_RETRY:
1069                 if (opt > LLC_OPT_MAX_RETRY)
1070                         goto out;
1071                 llc->n2 = opt;
1072                 break;
1073         case LLC_OPT_SIZE:
1074                 if (opt > LLC_OPT_MAX_SIZE)
1075                         goto out;
1076                 llc->n1 = opt;
1077                 break;
1078         case LLC_OPT_ACK_TMR_EXP:
1079                 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1080                         goto out;
1081                 llc->ack_timer.expire = opt * HZ;
1082                 break;
1083         case LLC_OPT_P_TMR_EXP:
1084                 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1085                         goto out;
1086                 llc->pf_cycle_timer.expire = opt * HZ;
1087                 break;
1088         case LLC_OPT_REJ_TMR_EXP:
1089                 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1090                         goto out;
1091                 llc->rej_sent_timer.expire = opt * HZ;
1092                 break;
1093         case LLC_OPT_BUSY_TMR_EXP:
1094                 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1095                         goto out;
1096                 llc->busy_state_timer.expire = opt * HZ;
1097                 break;
1098         case LLC_OPT_TX_WIN:
1099                 if (opt > LLC_OPT_MAX_WIN)
1100                         goto out;
1101                 llc->k = opt;
1102                 break;
1103         case LLC_OPT_RX_WIN:
1104                 if (opt > LLC_OPT_MAX_WIN)
1105                         goto out;
1106                 llc->rw = opt;
1107                 break;
1108         case LLC_OPT_PKTINFO:
1109                 if (opt)
1110                         llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1111                 else
1112                         llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1113                 break;
1114         default:
1115                 rc = -ENOPROTOOPT;
1116                 goto out;
1117         }
1118         rc = 0;
1119 out:
1120         release_sock(sk);
1121         return rc;
1122 }
1123 
1124 /**
1125  *      llc_ui_getsockopt - get connection specific socket info
1126  *      @sock: Socket to get information from.
1127  *      @level: Socket level user is requesting operations on.
1128  *      @optname: Operation name.
1129  *      @optval: Variable to return operation data in.
1130  *      @optlen: Length of optval.
1131  *
1132  *      Get connection specific socket information.
1133  */
1134 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1135                              char __user *optval, int __user *optlen)
1136 {
1137         struct sock *sk = sock->sk;
1138         struct llc_sock *llc = llc_sk(sk);
1139         int val = 0, len = 0, rc = -EINVAL;
1140 
1141         lock_sock(sk);
1142         if (unlikely(level != SOL_LLC))
1143                 goto out;
1144         rc = get_user(len, optlen);
1145         if (rc)
1146                 goto out;
1147         rc = -EINVAL;
1148         if (len != sizeof(int))
1149                 goto out;
1150         switch (optname) {
1151         case LLC_OPT_RETRY:
1152                 val = llc->n2;                                  break;
1153         case LLC_OPT_SIZE:
1154                 val = llc->n1;                                  break;
1155         case LLC_OPT_ACK_TMR_EXP:
1156                 val = llc->ack_timer.expire / HZ;               break;
1157         case LLC_OPT_P_TMR_EXP:
1158                 val = llc->pf_cycle_timer.expire / HZ;          break;
1159         case LLC_OPT_REJ_TMR_EXP:
1160                 val = llc->rej_sent_timer.expire / HZ;          break;
1161         case LLC_OPT_BUSY_TMR_EXP:
1162                 val = llc->busy_state_timer.expire / HZ;        break;
1163         case LLC_OPT_TX_WIN:
1164                 val = llc->k;                           break;
1165         case LLC_OPT_RX_WIN:
1166                 val = llc->rw;                          break;
1167         case LLC_OPT_PKTINFO:
1168                 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1169                 break;
1170         default:
1171                 rc = -ENOPROTOOPT;
1172                 goto out;
1173         }
1174         rc = 0;
1175         if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1176                 rc = -EFAULT;
1177 out:
1178         release_sock(sk);
1179         return rc;
1180 }
1181 
1182 static const struct net_proto_family llc_ui_family_ops = {
1183         .family = PF_LLC,
1184         .create = llc_ui_create,
1185         .owner  = THIS_MODULE,
1186 };
1187 
1188 static const struct proto_ops llc_ui_ops = {
1189         .family      = PF_LLC,
1190         .owner       = THIS_MODULE,
1191         .release     = llc_ui_release,
1192         .bind        = llc_ui_bind,
1193         .connect     = llc_ui_connect,
1194         .socketpair  = sock_no_socketpair,
1195         .accept      = llc_ui_accept,
1196         .getname     = llc_ui_getname,
1197         .poll        = datagram_poll,
1198         .ioctl       = llc_ui_ioctl,
1199         .listen      = llc_ui_listen,
1200         .shutdown    = llc_ui_shutdown,
1201         .setsockopt  = llc_ui_setsockopt,
1202         .getsockopt  = llc_ui_getsockopt,
1203         .sendmsg     = llc_ui_sendmsg,
1204         .recvmsg     = llc_ui_recvmsg,
1205         .mmap        = sock_no_mmap,
1206         .sendpage    = sock_no_sendpage,
1207 };
1208 
1209 static const char llc_proc_err_msg[] __initconst =
1210         KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1211 static const char llc_sysctl_err_msg[] __initconst =
1212         KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1213 static const char llc_sock_err_msg[] __initconst =
1214         KERN_CRIT "LLC: Unable to register the network family\n";
1215 
1216 static int __init llc2_init(void)
1217 {
1218         int rc = proto_register(&llc_proto, 0);
1219 
1220         if (rc != 0)
1221                 goto out;
1222 
1223         llc_build_offset_table();
1224         llc_station_init();
1225         llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1226         rc = llc_proc_init();
1227         if (rc != 0) {
1228                 printk(llc_proc_err_msg);
1229                 goto out_station;
1230         }
1231         rc = llc_sysctl_init();
1232         if (rc) {
1233                 printk(llc_sysctl_err_msg);
1234                 goto out_proc;
1235         }
1236         rc = sock_register(&llc_ui_family_ops);
1237         if (rc) {
1238                 printk(llc_sock_err_msg);
1239                 goto out_sysctl;
1240         }
1241         llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1242         llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1243 out:
1244         return rc;
1245 out_sysctl:
1246         llc_sysctl_exit();
1247 out_proc:
1248         llc_proc_exit();
1249 out_station:
1250         llc_station_exit();
1251         proto_unregister(&llc_proto);
1252         goto out;
1253 }
1254 
1255 static void __exit llc2_exit(void)
1256 {
1257         llc_station_exit();
1258         llc_remove_pack(LLC_DEST_SAP);
1259         llc_remove_pack(LLC_DEST_CONN);
1260         sock_unregister(PF_LLC);
1261         llc_proc_exit();
1262         llc_sysctl_exit();
1263         proto_unregister(&llc_proto);
1264 }
1265 
1266 module_init(llc2_init);
1267 module_exit(llc2_exit);
1268 
1269 MODULE_LICENSE("GPL");
1270 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1271 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1272 MODULE_ALIAS_NETPROTO(PF_LLC);
/* [<][>][^][v][top][bottom][index][help] */
root/net/llc/af_llc.c

DEFINITIONS
