net/decnet/af_decnet.c

   1
   2 /*
   3  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   4  *              operating system.  DECnet is implemented using the  BSD Socket
   5  *              interface as the means of communication with the user level.
   6  *
   7  *              DECnet Socket Layer Interface
   8  *
   9  * Authors:     Eduardo Marcelo Serrat <emserrat@geocities.com>
  10  *              Patrick Caulfield <patrick@pandh.demon.co.uk>
  11  *
  12  * Changes:
  13  *        Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
  14  *                          version of the code. Original copyright preserved
  15  *                          below.
  16  *        Steve Whitehouse: Some bug fixes, cleaning up some code to make it
  17  *                          compatible with my routing layer.
  18  *        Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
  19  *                          Caulfield.
  20  *        Steve Whitehouse: Further bug fixes, checking module code still works
  21  *                          with new routing layer.
  22  *        Steve Whitehouse: Additional set/get_sockopt() calls.
  23  *        Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
  24  *                          code.
  25  *        Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
  26  *                          way. Didn't manage it entirely, but its better.
  27  *        Steve Whitehouse: ditto for sendmsg().
  28  *        Steve Whitehouse: A selection of bug fixes to various things.
  29  *        Steve Whitehouse: Added TIOCOUTQ ioctl.
  30  *        Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
  31  *        Steve Whitehouse: Fixes to connect() error returns.
  32  *       Patrick Caulfield: Fixes to delayed acceptance logic.
  33  *         David S. Miller: New socket locking
  34  *        Steve Whitehouse: Socket list hashing/locking
  35  *         Arnaldo C. Melo: use capable, not suser
  36  *        Steve Whitehouse: Removed unused code. Fix to use sk->allocation
  37  *                          when required.
  38  *       Patrick Caulfield: /proc/net/decnet now has object name/number
  39  *        Steve Whitehouse: Fixed local port allocation, hashed sk list
  40  *          Matthew Wilcox: Fixes for dn_ioctl()
  41  *        Steve Whitehouse: New connect/accept logic to allow timeouts and
  42  *                          prepare for sendpage etc.
  43  */
  44
  45
  46 /******************************************************************************
  47     (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
  48
  49     This program is free software; you can redistribute it and/or modify
  50     it under the terms of the GNU General Public License as published by
  51     the Free Software Foundation; either version 2 of the License, or
  52     any later version.
  53
  54     This program is distributed in the hope that it will be useful,
  55     but WITHOUT ANY WARRANTY; without even the implied warranty of
  56     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  57     GNU General Public License for more details.
  58
  59 HISTORY:
  60
  61 Version           Kernel     Date       Author/Comments
  62 -------           ------     ----       ---------------
  63 Version 0.0.1     2.0.30    01-dic-97   Eduardo Marcelo Serrat
  64                                         (emserrat@geocities.com)
  65
  66                                         First Development of DECnet Socket La-
  67                                         yer for Linux. Only supports outgoing
  68                                         connections.
  69
  70 Version 0.0.2     2.1.105   20-jun-98   Patrick J. Caulfield
  71                                         (patrick@pandh.demon.co.uk)
  72
  73                                         Port to new kernel development version.
  74
  75 Version 0.0.3     2.1.106   25-jun-98   Eduardo Marcelo Serrat
  76                                         (emserrat@geocities.com)
  77                                         _
  78                                         Added support for incoming connections
  79                                         so we can start developing server apps
  80                                         on Linux.
  81                                         -
  82                                         Module Support
  83 Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
  84                                        (emserrat@geocities.com)
  85                                        _
  86                                         Added support for X11R6.4. Now we can
  87                                         use DECnet transport for X on Linux!!!
  88                                        -
  89 Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
  90                                        (emserrat@geocities.com)
  91                                        Removed bugs on flow control
  92                                        Removed bugs on incoming accessdata
  93                                        order
  94                                        -
  95 Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
  96                                        dn_recvmsg fixes
  97
  98                                         Patrick J. Caulfield
  99                                        dn_bind fixes
 100 *******************************************************************************/
 101
 102 #include <linux/module.h>
 103 #include <linux/errno.h>
 104 #include <linux/types.h>
 105 #include <linux/slab.h>
 106 #include <linux/socket.h>
 107 #include <linux/in.h>
 108 #include <linux/kernel.h>
 109 #include <linux/sched/signal.h>
 110 #include <linux/timer.h>
 111 #include <linux/string.h>
 112 #include <linux/sockios.h>
 113 #include <linux/net.h>
 114 #include <linux/netdevice.h>
 115 #include <linux/inet.h>
 116 #include <linux/route.h>
 117 #include <linux/netfilter.h>
 118 #include <linux/seq_file.h>
 119 #include <net/sock.h>
 120 #include <net/tcp_states.h>
 121 #include <net/flow.h>
 122 #include <asm/ioctls.h>
 123 #include <linux/capability.h>
 124 #include <linux/mm.h>
 125 #include <linux/interrupt.h>
 126 #include <linux/proc_fs.h>
 127 #include <linux/stat.h>
 128 #include <linux/init.h>
 129 #include <linux/poll.h>
 130 #include <linux/jiffies.h>
 131 #include <net/net_namespace.h>
 132 #include <net/neighbour.h>
 133 #include <net/dst.h>
 134 #include <net/fib_rules.h>
 135 #include <net/tcp.h>
 136 #include <net/dn.h>
 137 #include <net/dn_nsp.h>
 138 #include <net/dn_dev.h>
 139 #include <net/dn_route.h>
 140 #include <net/dn_fib.h>
 141 #include <net/dn_neigh.h>
 142
 143 struct dn_sock {
 144         struct sock sk;
 145         struct dn_scp scp;
 146 };
 147
 148 static void dn_keepalive(struct sock *sk);
 149
 150 #define DN_SK_HASH_SHIFT 8
 151 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
 152 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
 153
 154
 155 static const struct proto_ops dn_proto_ops;
 156 static DEFINE_RWLOCK(dn_hash_lock);
 157 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 158 static struct hlist_head dn_wild_sk;
 159 static atomic_long_t decnet_memory_allocated;
 160
 161 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
 162 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 163
 164 static struct hlist_head *dn_find_list(struct sock *sk)
 165 {
 166         struct dn_scp *scp = DN_SK(sk);
 167
 168         if (scp->addr.sdn_flags & SDF_WILD)
 169                 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
 170
 171         return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
 172 }
 173
 174 /*
 175  * Valid ports are those greater than zero and not already in use.
 176  */
 177 static int check_port(__le16 port)
 178 {
 179         struct sock *sk;
 180
 181         if (port == 0)
 182                 return -1;
 183
 184         sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
 185                 struct dn_scp *scp = DN_SK(sk);
 186                 if (scp->addrloc == port)
 187                         return -1;
 188         }
 189         return 0;
 190 }
 191
 192 static unsigned short port_alloc(struct sock *sk)
 193 {
 194         struct dn_scp *scp = DN_SK(sk);
 195 static unsigned short port = 0x2000;
 196         unsigned short i_port = port;
 197
 198         while(check_port(cpu_to_le16(++port)) != 0) {
 199                 if (port == i_port)
 200                         return 0;
 201         }
 202
 203         scp->addrloc = cpu_to_le16(port);
 204
 205         return 1;
 206 }
 207
 208 /*
 209  * Since this is only ever called from user
 210  * level, we don't need a write_lock() version
 211  * of this.
 212  */
 213 static int dn_hash_sock(struct sock *sk)
 214 {
 215         struct dn_scp *scp = DN_SK(sk);
 216         struct hlist_head *list;
 217         int rv = -EUSERS;
 218
 219         BUG_ON(sk_hashed(sk));
 220
 221         write_lock_bh(&dn_hash_lock);
 222
 223         if (!scp->addrloc && !port_alloc(sk))
 224                 goto out;
 225
 226         rv = -EADDRINUSE;
 227         if ((list = dn_find_list(sk)) == NULL)
 228                 goto out;
 229
 230         sk_add_node(sk, list);
 231         rv = 0;
 232 out:
 233         write_unlock_bh(&dn_hash_lock);
 234         return rv;
 235 }
 236
 237 static void dn_unhash_sock(struct sock *sk)
 238 {
 239         write_lock(&dn_hash_lock);
 240         sk_del_node_init(sk);
 241         write_unlock(&dn_hash_lock);
 242 }
 243
 244 static void dn_unhash_sock_bh(struct sock *sk)
 245 {
 246         write_lock_bh(&dn_hash_lock);
 247         sk_del_node_init(sk);
 248         write_unlock_bh(&dn_hash_lock);
 249 }
 250
 251 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
 252 {
 253         int i;
 254         unsigned int hash = addr->sdn_objnum;
 255
 256         if (hash == 0) {
 257                 hash = addr->sdn_objnamel;
 258                 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
 259                         hash ^= addr->sdn_objname[i];
 260                         hash ^= (hash << 3);
 261                 }
 262         }
 263
 264         return &dn_sk_hash[hash & DN_SK_HASH_MASK];
 265 }
 266
 267 /*
 268  * Called to transform a socket from bound (i.e. with a local address)
 269  * into a listening socket (doesn't need a local port number) and rehashes
 270  * based upon the object name/number.
 271  */
 272 static void dn_rehash_sock(struct sock *sk)
 273 {
 274         struct hlist_head *list;
 275         struct dn_scp *scp = DN_SK(sk);
 276
 277         if (scp->addr.sdn_flags & SDF_WILD)
 278                 return;
 279
 280         write_lock_bh(&dn_hash_lock);
 281         sk_del_node_init(sk);
 282         DN_SK(sk)->addrloc = 0;
 283         list = listen_hash(&DN_SK(sk)->addr);
 284         sk_add_node(sk, list);
 285         write_unlock_bh(&dn_hash_lock);
 286 }
 287
 288 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
 289 {
 290         int len = 2;
 291
 292         *buf++ = type;
 293
 294         switch (type) {
 295         case 0:
 296                 *buf++ = sdn->sdn_objnum;
 297                 break;
 298         case 1:
 299                 *buf++ = 0;
 300                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
 301                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 302                 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
 303                 break;
 304         case 2:
 305                 memset(buf, 0, 5);
 306                 buf += 5;
 307                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
 308                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 309                 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
 310                 break;
 311         }
 312
 313         return len;
 314 }
 315
 316 /*
 317  * On reception of usernames, we handle types 1 and 0 for destination
 318  * addresses only. Types 2 and 4 are used for source addresses, but the
 319  * UIC, GIC are ignored and they are both treated the same way. Type 3
 320  * is never used as I've no idea what its purpose might be or what its
 321  * format is.
 322  */
 323 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
 324 {
 325         unsigned char type;
 326         int size = len;
 327         int namel = 12;
 328
 329         sdn->sdn_objnum = 0;
 330         sdn->sdn_objnamel = cpu_to_le16(0);
 331         memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 332
 333         if (len < 2)
 334                 return -1;
 335
 336         len -= 2;
 337         *fmt = *data++;
 338         type = *data++;
 339
 340         switch (*fmt) {
 341         case 0:
 342                 sdn->sdn_objnum = type;
 343                 return 2;
 344         case 1:
 345                 namel = 16;
 346                 break;
 347         case 2:
 348                 len  -= 4;
 349                 data += 4;
 350                 break;
 351         case 4:
 352                 len  -= 8;
 353                 data += 8;
 354                 break;
 355         default:
 356                 return -1;
 357         }
 358
 359         len -= 1;
 360
 361         if (len < 0)
 362                 return -1;
 363
 364         sdn->sdn_objnamel = cpu_to_le16(*data++);
 365         len -= le16_to_cpu(sdn->sdn_objnamel);
 366
 367         if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
 368                 return -1;
 369
 370         memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
 371
 372         return size - len;
 373 }
 374
 375 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
 376 {
 377         struct hlist_head *list = listen_hash(addr);
 378         struct sock *sk;
 379
 380         read_lock(&dn_hash_lock);
 381         sk_for_each(sk, list) {
 382                 struct dn_scp *scp = DN_SK(sk);
 383                 if (sk->sk_state != TCP_LISTEN)
 384                         continue;
 385                 if (scp->addr.sdn_objnum) {
 386                         if (scp->addr.sdn_objnum != addr->sdn_objnum)
 387                                 continue;
 388                 } else {
 389                         if (addr->sdn_objnum)
 390                                 continue;
 391                         if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 392                                 continue;
 393                         if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
 394                                 continue;
 395                 }
 396                 sock_hold(sk);
 397                 read_unlock(&dn_hash_lock);
 398                 return sk;
 399         }
 400
 401         sk = sk_head(&dn_wild_sk);
 402         if (sk) {
 403                 if (sk->sk_state == TCP_LISTEN)
 404                         sock_hold(sk);
 405                 else
 406                         sk = NULL;
 407         }
 408
 409         read_unlock(&dn_hash_lock);
 410         return sk;
 411 }
 412
 413 struct sock *dn_find_by_skb(struct sk_buff *skb)
 414 {
 415         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 416         struct sock *sk;
 417         struct dn_scp *scp;
 418
 419         read_lock(&dn_hash_lock);
 420         sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
 421                 scp = DN_SK(sk);
 422                 if (cb->src != dn_saddr2dn(&scp->peer))
 423                         continue;
 424                 if (cb->dst_port != scp->addrloc)
 425                         continue;
 426                 if (scp->addrrem && (cb->src_port != scp->addrrem))
 427                         continue;
 428                 sock_hold(sk);
 429                 goto found;
 430         }
 431         sk = NULL;
 432 found:
 433         read_unlock(&dn_hash_lock);
 434         return sk;
 435 }
 436
 437
 438
 439 static void dn_destruct(struct sock *sk)
 440 {
 441         struct dn_scp *scp = DN_SK(sk);
 442
 443         skb_queue_purge(&scp->data_xmit_queue);
 444         skb_queue_purge(&scp->other_xmit_queue);
 445         skb_queue_purge(&scp->other_receive_queue);
 446
 447         dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
 448 }
 449
 450 static unsigned long dn_memory_pressure;
 451
 452 static void dn_enter_memory_pressure(struct sock *sk)
 453 {
 454         if (!dn_memory_pressure) {
 455                 dn_memory_pressure = 1;
 456         }
 457 }
 458
 459 static struct proto dn_proto = {
 460         .name                   = "NSP",
 461         .owner                  = THIS_MODULE,
 462         .enter_memory_pressure  = dn_enter_memory_pressure,
 463         .memory_pressure        = &dn_memory_pressure,
 464         .memory_allocated       = &decnet_memory_allocated,
 465         .sysctl_mem             = sysctl_decnet_mem,
 466         .sysctl_wmem            = sysctl_decnet_wmem,
 467         .sysctl_rmem            = sysctl_decnet_rmem,
 468         .max_header             = DN_MAX_NSP_DATA_HEADER + 64,
 469         .obj_size               = sizeof(struct dn_sock),
 470 };
 471
 472 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
 473 {
 474         struct dn_scp *scp;
 475         struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
 476
 477         if  (!sk)
 478                 goto out;
 479
 480         if (sock)
 481                 sock->ops = &dn_proto_ops;
 482         sock_init_data(sock, sk);
 483
 484         sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 485         sk->sk_destruct    = dn_destruct;
 486         sk->sk_no_check_tx = 1;
 487         sk->sk_family      = PF_DECnet;
 488         sk->sk_protocol    = 0;
 489         sk->sk_allocation  = gfp;
 490         sk->sk_sndbuf      = sysctl_decnet_wmem[1];
 491         sk->sk_rcvbuf      = sysctl_decnet_rmem[1];
 492
 493         /* Initialization of DECnet Session Control Port                */
 494         scp = DN_SK(sk);
 495         scp->state      = DN_O;         /* Open                 */
 496         scp->numdat     = 1;            /* Next data seg to tx  */
 497         scp->numoth     = 1;            /* Next oth data to tx  */
 498         scp->ackxmt_dat = 0;            /* Last data seg ack'ed */
 499         scp->ackxmt_oth = 0;            /* Last oth data ack'ed */
 500         scp->ackrcv_dat = 0;            /* Highest data ack recv*/
 501         scp->ackrcv_oth = 0;            /* Last oth data ack rec*/
 502         scp->flowrem_sw = DN_SEND;
 503         scp->flowloc_sw = DN_SEND;
 504         scp->flowrem_dat = 0;
 505         scp->flowrem_oth = 1;
 506         scp->flowloc_dat = 0;
 507         scp->flowloc_oth = 1;
 508         scp->services_rem = 0;
 509         scp->services_loc = 1 | NSP_FC_NONE;
 510         scp->info_rem = 0;
 511         scp->info_loc = 0x03; /* NSP version 4.1 */
 512         scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 513         scp->nonagle = 0;
 514         scp->multi_ireq = 1;
 515         scp->accept_mode = ACC_IMMED;
 516         scp->addr.sdn_family    = AF_DECnet;
 517         scp->peer.sdn_family    = AF_DECnet;
 518         scp->accessdata.acc_accl = 5;
 519         memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 520
 521         scp->max_window   = NSP_MAX_WINDOW;
 522         scp->snd_window   = NSP_MIN_WINDOW;
 523         scp->nsp_srtt     = NSP_INITIAL_SRTT;
 524         scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 525         scp->nsp_rxtshift = 0;
 526
 527         skb_queue_head_init(&scp->data_xmit_queue);
 528         skb_queue_head_init(&scp->other_xmit_queue);
 529         skb_queue_head_init(&scp->other_receive_queue);
 530
 531         scp->persist = 0;
 532         scp->persist_fxn = NULL;
 533         scp->keepalive = 10 * HZ;
 534         scp->keepalive_fxn = dn_keepalive;
 535
 536         dn_start_slow_timer(sk);
 537 out:
 538         return sk;
 539 }
 540
 541 /*
 542  * Keepalive timer.
 543  * FIXME: Should respond to SO_KEEPALIVE etc.
 544  */
 545 static void dn_keepalive(struct sock *sk)
 546 {
 547         struct dn_scp *scp = DN_SK(sk);
 548
 549         /*
 550          * By checking the other_data transmit queue is empty
 551          * we are double checking that we are not sending too
 552          * many of these keepalive frames.
 553          */
 554         if (skb_queue_empty(&scp->other_xmit_queue))
 555                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 556 }
 557
 558
 559 /*
 560  * Timer for shutdown/destroyed sockets.
 561  * When socket is dead & no packets have been sent for a
 562  * certain amount of time, they are removed by this
 563  * routine. Also takes care of sending out DI & DC
 564  * frames at correct times.
 565  */
 566 int dn_destroy_timer(struct sock *sk)
 567 {
 568         struct dn_scp *scp = DN_SK(sk);
 569
 570         scp->persist = dn_nsp_persist(sk);
 571
 572         switch (scp->state) {
 573         case DN_DI:
 574                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 575                 if (scp->nsp_rxtshift >= decnet_di_count)
 576                         scp->state = DN_CN;
 577                 return 0;
 578
 579         case DN_DR:
 580                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 581                 if (scp->nsp_rxtshift >= decnet_dr_count)
 582                         scp->state = DN_DRC;
 583                 return 0;
 584
 585         case DN_DN:
 586                 if (scp->nsp_rxtshift < decnet_dn_count) {
 587                         /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 588                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 589                                          GFP_ATOMIC);
 590                         return 0;
 591                 }
 592         }
 593
 594         scp->persist = (HZ * decnet_time_wait);
 595
 596         if (sk->sk_socket)
 597                 return 0;
 598
 599         if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
 600                 dn_unhash_sock(sk);
 601                 sock_put(sk);
 602                 return 1;
 603         }
 604
 605         return 0;
 606 }
 607
 608 static void dn_destroy_sock(struct sock *sk)
 609 {
 610         struct dn_scp *scp = DN_SK(sk);
 611
 612         scp->nsp_rxtshift = 0; /* reset back off */
 613
 614         if (sk->sk_socket) {
 615                 if (sk->sk_socket->state != SS_UNCONNECTED)
 616                         sk->sk_socket->state = SS_DISCONNECTING;
 617         }
 618
 619         sk->sk_state = TCP_CLOSE;
 620
 621         switch (scp->state) {
 622         case DN_DN:
 623                 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 624                                  sk->sk_allocation);
 625                 scp->persist_fxn = dn_destroy_timer;
 626                 scp->persist = dn_nsp_persist(sk);
 627                 break;
 628         case DN_CR:
 629                 scp->state = DN_DR;
 630                 goto disc_reject;
 631         case DN_RUN:
 632                 scp->state = DN_DI;
 633                 /* fall through */
 634         case DN_DI:
 635         case DN_DR:
 636 disc_reject:
 637                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 638                 /* fall through */
 639         case DN_NC:
 640         case DN_NR:
 641         case DN_RJ:
 642         case DN_DIC:
 643         case DN_CN:
 644         case DN_DRC:
 645         case DN_CI:
 646         case DN_CD:
 647                 scp->persist_fxn = dn_destroy_timer;
 648                 scp->persist = dn_nsp_persist(sk);
 649                 break;
 650         default:
 651                 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 652                 /* fall through */
 653         case DN_O:
 654                 dn_stop_slow_timer(sk);
 655
 656                 dn_unhash_sock_bh(sk);
 657                 sock_put(sk);
 658
 659                 break;
 660         }
 661 }
 662
 663 char *dn_addr2asc(__u16 addr, char *buf)
 664 {
 665         unsigned short node, area;
 666
 667         node = addr & 0x03ff;
 668         area = addr >> 10;
 669         sprintf(buf, "%hd.%hd", area, node);
 670
 671         return buf;
 672 }
 673
 674
 675
 676 static int dn_create(struct net *net, struct socket *sock, int protocol,
 677                      int kern)
 678 {
 679         struct sock *sk;
 680
 681         if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
 682                 return -EINVAL;
 683
 684         if (!net_eq(net, &init_net))
 685                 return -EAFNOSUPPORT;
 686
 687         switch (sock->type) {
 688         case SOCK_SEQPACKET:
 689                 if (protocol != DNPROTO_NSP)
 690                         return -EPROTONOSUPPORT;
 691                 break;
 692         case SOCK_STREAM:
 693                 break;
 694         default:
 695                 return -ESOCKTNOSUPPORT;
 696         }
 697
 698
 699         if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL)
 700                 return -ENOBUFS;
 701
 702         sk->sk_protocol = protocol;
 703
 704         return 0;
 705 }
 706
 707
 708 static int
 709 dn_release(struct socket *sock)
 710 {
 711         struct sock *sk = sock->sk;
 712
 713         if (sk) {
 714                 sock_orphan(sk);
 715                 sock_hold(sk);
 716                 lock_sock(sk);
 717                 dn_destroy_sock(sk);
 718                 release_sock(sk);
 719                 sock_put(sk);
 720         }
 721
 722         return 0;
 723 }
 724
 725 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 726 {
 727         struct sock *sk = sock->sk;
 728         struct dn_scp *scp = DN_SK(sk);
 729         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 730         struct net_device *dev, *ldev;
 731         int rv;
 732
 733         if (addr_len != sizeof(struct sockaddr_dn))
 734                 return -EINVAL;
 735
 736         if (saddr->sdn_family != AF_DECnet)
 737                 return -EINVAL;
 738
 739         if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
 740                 return -EINVAL;
 741
 742         if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
 743                 return -EINVAL;
 744
 745         if (saddr->sdn_flags & ~SDF_WILD)
 746                 return -EINVAL;
 747
 748         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 749             (saddr->sdn_flags & SDF_WILD)))
 750                 return -EACCES;
 751
 752         if (!(saddr->sdn_flags & SDF_WILD)) {
 753                 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
 754                         rcu_read_lock();
 755                         ldev = NULL;
 756                         for_each_netdev_rcu(&init_net, dev) {
 757                                 if (!dev->dn_ptr)
 758                                         continue;
 759                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 760                                         ldev = dev;
 761                                         break;
 762                                 }
 763                         }
 764                         rcu_read_unlock();
 765                         if (ldev == NULL)
 766                                 return -EADDRNOTAVAIL;
 767                 }
 768         }
 769
 770         rv = -EINVAL;
 771         lock_sock(sk);
 772         if (sock_flag(sk, SOCK_ZAPPED)) {
 773                 memcpy(&scp->addr, saddr, addr_len);
 774                 sock_reset_flag(sk, SOCK_ZAPPED);
 775
 776                 rv = dn_hash_sock(sk);
 777                 if (rv)
 778                         sock_set_flag(sk, SOCK_ZAPPED);
 779         }
 780         release_sock(sk);
 781
 782         return rv;
 783 }
 784
 785
 786 static int dn_auto_bind(struct socket *sock)
 787 {
 788         struct sock *sk = sock->sk;
 789         struct dn_scp *scp = DN_SK(sk);
 790         int rv;
 791
 792         sock_reset_flag(sk, SOCK_ZAPPED);
 793
 794         scp->addr.sdn_flags  = 0;
 795         scp->addr.sdn_objnum = 0;
 796
 797         /*
 798          * This stuff is to keep compatibility with Eduardo's
 799          * patch. I hope I can dispense with it shortly...
 800          */
 801         if ((scp->accessdata.acc_accl != 0) &&
 802                 (scp->accessdata.acc_accl <= 12)) {
 803
 804                 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
 805                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
 806
 807                 scp->accessdata.acc_accl = 0;
 808                 memset(scp->accessdata.acc_acc, 0, 40);
 809         }
 810         /* End of compatibility stuff */
 811
 812         scp->addr.sdn_add.a_len = cpu_to_le16(2);
 813         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 814         if (rv == 0) {
 815                 rv = dn_hash_sock(sk);
 816                 if (rv)
 817                         sock_set_flag(sk, SOCK_ZAPPED);
 818         }
 819
 820         return rv;
 821 }
 822
 823 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 824 {
 825         struct dn_scp *scp = DN_SK(sk);
 826         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 827         int err;
 828
 829         if (scp->state != DN_CR)
 830                 return -EINVAL;
 831
 832         scp->state = DN_CC;
 833         scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
 834         dn_send_conn_conf(sk, allocation);
 835
 836         add_wait_queue(sk_sleep(sk), &wait);
 837         for(;;) {
 838                 release_sock(sk);
 839                 if (scp->state == DN_CC)
 840                         *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
 841                 lock_sock(sk);
 842                 err = 0;
 843                 if (scp->state == DN_RUN)
 844                         break;
 845                 err = sock_error(sk);
 846                 if (err)
 847                         break;
 848                 err = sock_intr_errno(*timeo);
 849                 if (signal_pending(current))
 850                         break;
 851                 err = -EAGAIN;
 852                 if (!*timeo)
 853                         break;
 854         }
 855         remove_wait_queue(sk_sleep(sk), &wait);
 856         if (err == 0) {
 857                 sk->sk_socket->state = SS_CONNECTED;
 858         } else if (scp->state != DN_CC) {
 859                 sk->sk_socket->state = SS_UNCONNECTED;
 860         }
 861         return err;
 862 }
 863
 864 static int dn_wait_run(struct sock *sk, long *timeo)
 865 {
 866         struct dn_scp *scp = DN_SK(sk);
 867         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 868         int err = 0;
 869
 870         if (scp->state == DN_RUN)
 871                 goto out;
 872
 873         if (!*timeo)
 874                 return -EALREADY;
 875
 876         add_wait_queue(sk_sleep(sk), &wait);
 877         for(;;) {
 878                 release_sock(sk);
 879                 if (scp->state == DN_CI || scp->state == DN_CC)
 880                         *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
 881                 lock_sock(sk);
 882                 err = 0;
 883                 if (scp->state == DN_RUN)
 884                         break;
 885                 err = sock_error(sk);
 886                 if (err)
 887                         break;
 888                 err = sock_intr_errno(*timeo);
 889                 if (signal_pending(current))
 890                         break;
 891                 err = -ETIMEDOUT;
 892                 if (!*timeo)
 893                         break;
 894         }
 895         remove_wait_queue(sk_sleep(sk), &wait);
 896 out:
 897         if (err == 0) {
 898                 sk->sk_socket->state = SS_CONNECTED;
 899         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 900                 sk->sk_socket->state = SS_UNCONNECTED;
 901         }
 902         return err;
 903 }
 904
 905 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 906 {
 907         struct socket *sock = sk->sk_socket;
 908         struct dn_scp *scp = DN_SK(sk);
 909         int err = -EISCONN;
 910         struct flowidn fld;
 911         struct dst_entry *dst;
 912
 913         if (sock->state == SS_CONNECTED)
 914                 goto out;
 915
 916         if (sock->state == SS_CONNECTING) {
 917                 err = 0;
 918                 if (scp->state == DN_RUN) {
 919                         sock->state = SS_CONNECTED;
 920                         goto out;
 921                 }
 922                 err = -ECONNREFUSED;
 923                 if (scp->state != DN_CI && scp->state != DN_CC) {
 924                         sock->state = SS_UNCONNECTED;
 925                         goto out;
 926                 }
 927                 return dn_wait_run(sk, timeo);
 928         }
 929
 930         err = -EINVAL;
 931         if (scp->state != DN_O)
 932                 goto out;
 933
 934         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 935                 goto out;
 936         if (addr->sdn_family != AF_DECnet)
 937                 goto out;
 938         if (addr->sdn_flags & SDF_WILD)
 939                 goto out;
 940
 941         if (sock_flag(sk, SOCK_ZAPPED)) {
 942                 err = dn_auto_bind(sk->sk_socket);
 943                 if (err)
 944                         goto out;
 945         }
 946
 947         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 948
 949         err = -EHOSTUNREACH;
 950         memset(&fld, 0, sizeof(fld));
 951         fld.flowidn_oif = sk->sk_bound_dev_if;
 952         fld.daddr = dn_saddr2dn(&scp->peer);
 953         fld.saddr = dn_saddr2dn(&scp->addr);
 954         dn_sk_ports_copy(&fld, scp);
 955         fld.flowidn_proto = DNPROTO_NSP;
 956         if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
 957                 goto out;
 958         dst = __sk_dst_get(sk);
 959         sk->sk_route_caps = dst->dev->features;
 960         sock->state = SS_CONNECTING;
 961         scp->state = DN_CI;
 962         scp->segsize_loc = dst_metric_advmss(dst);
 963
 964         dn_nsp_send_conninit(sk, NSP_CI);
 965         err = -EINPROGRESS;
 966         if (*timeo) {
 967                 err = dn_wait_run(sk, timeo);
 968         }
 969 out:
 970         return err;
 971 }
 972
 973 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 974 {
 975         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 976         struct sock *sk = sock->sk;
 977         int err;
 978         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 979
 980         lock_sock(sk);
 981         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 982         release_sock(sk);
 983
 984         return err;
 985 }
 986
 987 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 988 {
 989         struct dn_scp *scp = DN_SK(sk);
 990
 991         switch (scp->state) {
 992         case DN_RUN:
 993                 return 0;
 994         case DN_CR:
 995                 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 996         case DN_CI:
 997         case DN_CC:
 998                 return dn_wait_run(sk, timeo);
 999         case DN_O:
1000                 return __dn_connect(sk, addr, addrlen, timeo, flags);
1001         }
1002
1003         return -EINVAL;
1004 }
1005
1006
1007 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1008 {
1009         unsigned char *ptr = skb->data;
1010
1011         acc->acc_userl = *ptr++;
1012         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1013         ptr += acc->acc_userl;
1014
1015         acc->acc_passl = *ptr++;
1016         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1017         ptr += acc->acc_passl;
1018
1019         acc->acc_accl = *ptr++;
1020         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1021
1022         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1023
1024 }
1025
1026 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1027 {
1028         unsigned char *ptr = skb->data;
1029         u16 len = *ptr++; /* yes, it's 8bit on the wire */
1030
1031         BUG_ON(len > 16); /* we've checked the contents earlier */
1032         opt->opt_optl   = cpu_to_le16(len);
1033         opt->opt_status = 0;
1034         memcpy(opt->opt_data, ptr, len);
1035         skb_pull(skb, len + 1);
1036 }
1037
1038 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1039 {
1040         DEFINE_WAIT_FUNC(wait, woken_wake_function);
1041         struct sk_buff *skb = NULL;
1042         int err = 0;
1043
1044         add_wait_queue(sk_sleep(sk), &wait);
1045         for(;;) {
1046                 release_sock(sk);
1047                 skb = skb_dequeue(&sk->sk_receive_queue);
1048                 if (skb == NULL) {
1049                         *timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
1050                         skb = skb_dequeue(&sk->sk_receive_queue);
1051                 }
1052                 lock_sock(sk);
1053                 if (skb != NULL)
1054                         break;
1055                 err = -EINVAL;
1056                 if (sk->sk_state != TCP_LISTEN)
1057                         break;
1058                 err = sock_intr_errno(*timeo);
1059                 if (signal_pending(current))
1060                         break;
1061                 err = -EAGAIN;
1062                 if (!*timeo)
1063                         break;
1064         }
1065         remove_wait_queue(sk_sleep(sk), &wait);
1066
1067         return skb == NULL ? ERR_PTR(err) : skb;
1068 }
1069
1070 static int dn_accept(struct socket *sock, struct socket *newsock, int flags,
1071                      bool kern)
1072 {
1073         struct sock *sk = sock->sk, *newsk;
1074         struct sk_buff *skb = NULL;
1075         struct dn_skb_cb *cb;
1076         unsigned char menuver;
1077         int err = 0;
1078         unsigned char type;
1079         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1080         struct dst_entry *dst;
1081
1082         lock_sock(sk);
1083
1084         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1085                 release_sock(sk);
1086                 return -EINVAL;
1087         }
1088
1089         skb = skb_dequeue(&sk->sk_receive_queue);
1090         if (skb == NULL) {
1091                 skb = dn_wait_for_connect(sk, &timeo);
1092                 if (IS_ERR(skb)) {
1093                         release_sock(sk);
1094                         return PTR_ERR(skb);
1095                 }
1096         }
1097
1098         cb = DN_SKB_CB(skb);
1099         sk->sk_ack_backlog--;
1100         newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1101         if (newsk == NULL) {
1102                 release_sock(sk);
1103                 kfree_skb(skb);
1104                 return -ENOBUFS;
1105         }
1106         release_sock(sk);
1107
1108         dst = skb_dst(skb);
1109         sk_dst_set(newsk, dst);
1110         skb_dst_set(skb, NULL);
1111
1112         DN_SK(newsk)->state        = DN_CR;
1113         DN_SK(newsk)->addrrem      = cb->src_port;
1114         DN_SK(newsk)->services_rem = cb->services;
1115         DN_SK(newsk)->info_rem     = cb->info;
1116         DN_SK(newsk)->segsize_rem  = cb->segsize;
1117         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1118
1119         if (DN_SK(newsk)->segsize_rem < 230)
1120                 DN_SK(newsk)->segsize_rem = 230;
1121
1122         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1123                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1124
1125         newsk->sk_state  = TCP_LISTEN;
1126         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1127
1128         /*
1129          * If we are listening on a wild socket, we don't want
1130          * the newly created socket on the wrong hash queue.
1131          */
1132         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1133
1134         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1135         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1136         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1137         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1138
1139         menuver = *skb->data;
1140         skb_pull(skb, 1);
1141
1142         if (menuver & DN_MENUVER_ACC)
1143                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1144
1145         if (menuver & DN_MENUVER_USR)
1146                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1147
1148         if (menuver & DN_MENUVER_PRX)
1149                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1150
1151         if (menuver & DN_MENUVER_UIC)
1152                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1153
1154         kfree_skb(skb);
1155
1156         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1157                 sizeof(struct optdata_dn));
1158         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1159                 sizeof(struct optdata_dn));
1160
1161         lock_sock(newsk);
1162         err = dn_hash_sock(newsk);
1163         if (err == 0) {
1164                 sock_reset_flag(newsk, SOCK_ZAPPED);
1165                 dn_send_conn_ack(newsk);
1166
1167                 /*
1168                  * Here we use sk->sk_allocation since although the conn conf is
1169                  * for the newsk, the context is the old socket.
1170                  */
1171                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1172                         err = dn_confirm_accept(newsk, &timeo,
1173                                                 sk->sk_allocation);
1174         }
1175         release_sock(newsk);
1176         return err;
1177 }
1178
1179
1180 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int peer)
1181 {
1182         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1183         struct sock *sk = sock->sk;
1184         struct dn_scp *scp = DN_SK(sk);
1185
1186         lock_sock(sk);
1187
1188         if (peer) {
1189                 if ((sock->state != SS_CONNECTED &&
1190                      sock->state != SS_CONNECTING) &&
1191                     scp->accept_mode == ACC_IMMED) {
1192                         release_sock(sk);
1193                         return -ENOTCONN;
1194                 }
1195
1196                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1197         } else {
1198                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1199         }
1200
1201         release_sock(sk);
1202
1203         return sizeof(struct sockaddr_dn);
1204 }
1205
1206
1207 static __poll_t dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1208 {
1209         struct sock *sk = sock->sk;
1210         struct dn_scp *scp = DN_SK(sk);
1211         __poll_t mask = datagram_poll(file, sock, wait);
1212
1213         if (!skb_queue_empty_lockless(&scp->other_receive_queue))
1214                 mask |= EPOLLRDBAND;
1215
1216         return mask;
1217 }
1218
1219 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1220 {
1221         struct sock *sk = sock->sk;
1222         struct dn_scp *scp = DN_SK(sk);
1223         int err = -EOPNOTSUPP;
1224         long amount = 0;
1225         struct sk_buff *skb;
1226         int val;
1227
1228         switch(cmd)
1229         {
1230         case SIOCGIFADDR:
1231         case SIOCSIFADDR:
1232                 return dn_dev_ioctl(cmd, (void __user *)arg);
1233
1234         case SIOCATMARK:
1235                 lock_sock(sk);
1236                 val = !skb_queue_empty(&scp->other_receive_queue);
1237                 if (scp->state != DN_RUN)
1238                         val = -ENOTCONN;
1239                 release_sock(sk);
1240                 return val;
1241
1242         case TIOCOUTQ:
1243                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1244                 if (amount < 0)
1245                         amount = 0;
1246                 err = put_user(amount, (int __user *)arg);
1247                 break;
1248
1249         case TIOCINQ:
1250                 lock_sock(sk);
1251                 skb = skb_peek(&scp->other_receive_queue);
1252                 if (skb) {
1253                         amount = skb->len;
1254                 } else {
1255                         skb_queue_walk(&sk->sk_receive_queue, skb)
1256                                 amount += skb->len;
1257                 }
1258                 release_sock(sk);
1259                 err = put_user(amount, (int __user *)arg);
1260                 break;
1261
1262         default:
1263                 err = -ENOIOCTLCMD;
1264                 break;
1265         }
1266
1267         return err;
1268 }
1269
1270 static int dn_listen(struct socket *sock, int backlog)
1271 {
1272         struct sock *sk = sock->sk;
1273         int err = -EINVAL;
1274
1275         lock_sock(sk);
1276
1277         if (sock_flag(sk, SOCK_ZAPPED))
1278                 goto out;
1279
1280         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1281                 goto out;
1282
1283         sk->sk_max_ack_backlog = backlog;
1284         sk->sk_ack_backlog     = 0;
1285         sk->sk_state           = TCP_LISTEN;
1286         err                 = 0;
1287         dn_rehash_sock(sk);
1288
1289 out:
1290         release_sock(sk);
1291
1292         return err;
1293 }
1294
1295
1296 static int dn_shutdown(struct socket *sock, int how)
1297 {
1298         struct sock *sk = sock->sk;
1299         struct dn_scp *scp = DN_SK(sk);
1300         int err = -ENOTCONN;
1301
1302         lock_sock(sk);
1303
1304         if (sock->state == SS_UNCONNECTED)
1305                 goto out;
1306
1307         err = 0;
1308         if (sock->state == SS_DISCONNECTING)
1309                 goto out;
1310
1311         err = -EINVAL;
1312         if (scp->state == DN_O)
1313                 goto out;
1314
1315         if (how != SHUT_RDWR)
1316                 goto out;
1317
1318         sk->sk_shutdown = SHUTDOWN_MASK;
1319         dn_destroy_sock(sk);
1320         err = 0;
1321
1322 out:
1323         release_sock(sk);
1324
1325         return err;
1326 }
1327
1328 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1329 {
1330         struct sock *sk = sock->sk;
1331         int err;
1332
1333         lock_sock(sk);
1334         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1335         release_sock(sk);
1336 #ifdef CONFIG_NETFILTER
1337         /* we need to exclude all possible ENOPROTOOPTs except default case */
1338         if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
1339             optname != DSO_STREAM && optname != DSO_SEQPACKET)
1340                 err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1341 #endif
1342
1343         return err;
1344 }
1345
1346 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1347 {
1348         struct  sock *sk = sock->sk;
1349         struct dn_scp *scp = DN_SK(sk);
1350         long timeo;
1351         union {
1352                 struct optdata_dn opt;
1353                 struct accessdata_dn acc;
1354                 int mode;
1355                 unsigned long win;
1356                 int val;
1357                 unsigned char services;
1358                 unsigned char info;
1359         } u;
1360         int err;
1361
1362         if (optlen && !optval)
1363                 return -EINVAL;
1364
1365         if (optlen > sizeof(u))
1366                 return -EINVAL;
1367
1368         if (copy_from_user(&u, optval, optlen))
1369                 return -EFAULT;
1370
1371         switch (optname) {
1372         case DSO_CONDATA:
1373                 if (sock->state == SS_CONNECTED)
1374                         return -EISCONN;
1375                 if ((scp->state != DN_O) && (scp->state != DN_CR))
1376                         return -EINVAL;
1377
1378                 if (optlen != sizeof(struct optdata_dn))
1379                         return -EINVAL;
1380
1381                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1382                         return -EINVAL;
1383
1384                 memcpy(&scp->conndata_out, &u.opt, optlen);
1385                 break;
1386
1387         case DSO_DISDATA:
1388                 if (sock->state != SS_CONNECTED &&
1389                     scp->accept_mode == ACC_IMMED)
1390                         return -ENOTCONN;
1391
1392                 if (optlen != sizeof(struct optdata_dn))
1393                         return -EINVAL;
1394
1395                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1396                         return -EINVAL;
1397
1398                 memcpy(&scp->discdata_out, &u.opt, optlen);
1399                 break;
1400
1401         case DSO_CONACCESS:
1402                 if (sock->state == SS_CONNECTED)
1403                         return -EISCONN;
1404                 if (scp->state != DN_O)
1405                         return -EINVAL;
1406
1407                 if (optlen != sizeof(struct accessdata_dn))
1408                         return -EINVAL;
1409
1410                 if ((u.acc.acc_accl > DN_MAXACCL) ||
1411                     (u.acc.acc_passl > DN_MAXACCL) ||
1412                     (u.acc.acc_userl > DN_MAXACCL))
1413                         return -EINVAL;
1414
1415                 memcpy(&scp->accessdata, &u.acc, optlen);
1416                 break;
1417
1418         case DSO_ACCEPTMODE:
1419                 if (sock->state == SS_CONNECTED)
1420                         return -EISCONN;
1421                 if (scp->state != DN_O)
1422                         return -EINVAL;
1423
1424                 if (optlen != sizeof(int))
1425                         return -EINVAL;
1426
1427                 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1428                         return -EINVAL;
1429
1430                 scp->accept_mode = (unsigned char)u.mode;
1431                 break;
1432
1433         case DSO_CONACCEPT:
1434                 if (scp->state != DN_CR)
1435                         return -EINVAL;
1436                 timeo = sock_rcvtimeo(sk, 0);
1437                 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1438                 return err;
1439
1440         case DSO_CONREJECT:
1441                 if (scp->state != DN_CR)
1442                         return -EINVAL;
1443
1444                 scp->state = DN_DR;
1445                 sk->sk_shutdown = SHUTDOWN_MASK;
1446                 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1447                 break;
1448
1449         case DSO_MAXWINDOW:
1450                 if (optlen != sizeof(unsigned long))
1451                         return -EINVAL;
1452                 if (u.win > NSP_MAX_WINDOW)
1453                         u.win = NSP_MAX_WINDOW;
1454                 if (u.win == 0)
1455                         return -EINVAL;
1456                 scp->max_window = u.win;
1457                 if (scp->snd_window > u.win)
1458                         scp->snd_window = u.win;
1459                 break;
1460
1461         case DSO_NODELAY:
1462                 if (optlen != sizeof(int))
1463                         return -EINVAL;
1464                 if (scp->nonagle == TCP_NAGLE_CORK)
1465                         return -EINVAL;
1466                 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
1467                 /* if (scp->nonagle == 1) { Push pending frames } */
1468                 break;
1469
1470         case DSO_CORK:
1471                 if (optlen != sizeof(int))
1472                         return -EINVAL;
1473                 if (scp->nonagle == TCP_NAGLE_OFF)
1474                         return -EINVAL;
1475                 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
1476                 /* if (scp->nonagle == 0) { Push pending frames } */
1477                 break;
1478
1479         case DSO_SERVICES:
1480                 if (optlen != sizeof(unsigned char))
1481                         return -EINVAL;
1482                 if ((u.services & ~NSP_FC_MASK) != 0x01)
1483                         return -EINVAL;
1484                 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1485                         return -EINVAL;
1486                 scp->services_loc = u.services;
1487                 break;
1488
1489         case DSO_INFO:
1490                 if (optlen != sizeof(unsigned char))
1491                         return -EINVAL;
1492                 if (u.info & 0xfc)
1493                         return -EINVAL;
1494                 scp->info_loc = u.info;
1495                 break;
1496
1497         case DSO_LINKINFO:
1498         case DSO_STREAM:
1499         case DSO_SEQPACKET:
1500         default:
1501                 return -ENOPROTOOPT;
1502         }
1503
1504         return 0;
1505 }
1506
1507 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1508 {
1509         struct sock *sk = sock->sk;
1510         int err;
1511
1512         lock_sock(sk);
1513         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1514         release_sock(sk);
1515 #ifdef CONFIG_NETFILTER
1516         if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
1517             optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
1518             optname != DSO_CONREJECT) {
1519                 int len;
1520
1521                 if (get_user(len, optlen))
1522                         return -EFAULT;
1523
1524                 err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1525                 if (err >= 0)
1526                         err = put_user(len, optlen);
1527         }
1528 #endif
1529
1530         return err;
1531 }
1532
1533 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1534 {
1535         struct  sock *sk = sock->sk;
1536         struct dn_scp *scp = DN_SK(sk);
1537         struct linkinfo_dn link;
1538         unsigned int r_len;
1539         void *r_data = NULL;
1540         unsigned int val;
1541
1542         if(get_user(r_len , optlen))
1543                 return -EFAULT;
1544
1545         switch (optname) {
1546         case DSO_CONDATA:
1547                 if (r_len > sizeof(struct optdata_dn))
1548                         r_len = sizeof(struct optdata_dn);
1549                 r_data = &scp->conndata_in;
1550                 break;
1551
1552         case DSO_DISDATA:
1553                 if (r_len > sizeof(struct optdata_dn))
1554                         r_len = sizeof(struct optdata_dn);
1555                 r_data = &scp->discdata_in;
1556                 break;
1557
1558         case DSO_CONACCESS:
1559                 if (r_len > sizeof(struct accessdata_dn))
1560                         r_len = sizeof(struct accessdata_dn);
1561                 r_data = &scp->accessdata;
1562                 break;
1563
1564         case DSO_ACCEPTMODE:
1565                 if (r_len > sizeof(unsigned char))
1566                         r_len = sizeof(unsigned char);
1567                 r_data = &scp->accept_mode;
1568                 break;
1569
1570         case DSO_LINKINFO:
1571                 if (r_len > sizeof(struct linkinfo_dn))
1572                         r_len = sizeof(struct linkinfo_dn);
1573
1574                 memset(&link, 0, sizeof(link));
1575
1576                 switch (sock->state) {
1577                 case SS_CONNECTING:
1578                         link.idn_linkstate = LL_CONNECTING;
1579                         break;
1580                 case SS_DISCONNECTING:
1581                         link.idn_linkstate = LL_DISCONNECTING;
1582                         break;
1583                 case SS_CONNECTED:
1584                         link.idn_linkstate = LL_RUNNING;
1585                         break;
1586                 default:
1587                         link.idn_linkstate = LL_INACTIVE;
1588                 }
1589
1590                 link.idn_segsize = scp->segsize_rem;
1591                 r_data = &link;
1592                 break;
1593
1594         case DSO_MAXWINDOW:
1595                 if (r_len > sizeof(unsigned long))
1596                         r_len = sizeof(unsigned long);
1597                 r_data = &scp->max_window;
1598                 break;
1599
1600         case DSO_NODELAY:
1601                 if (r_len > sizeof(int))
1602                         r_len = sizeof(int);
1603                 val = (scp->nonagle == TCP_NAGLE_OFF);
1604                 r_data = &val;
1605                 break;
1606
1607         case DSO_CORK:
1608                 if (r_len > sizeof(int))
1609                         r_len = sizeof(int);
1610                 val = (scp->nonagle == TCP_NAGLE_CORK);
1611                 r_data = &val;
1612                 break;
1613
1614         case DSO_SERVICES:
1615                 if (r_len > sizeof(unsigned char))
1616                         r_len = sizeof(unsigned char);
1617                 r_data = &scp->services_rem;
1618                 break;
1619
1620         case DSO_INFO:
1621                 if (r_len > sizeof(unsigned char))
1622                         r_len = sizeof(unsigned char);
1623                 r_data = &scp->info_rem;
1624                 break;
1625
1626         case DSO_STREAM:
1627         case DSO_SEQPACKET:
1628         case DSO_CONACCEPT:
1629         case DSO_CONREJECT:
1630         default:
1631                 return -ENOPROTOOPT;
1632         }
1633
1634         if (r_data) {
1635                 if (copy_to_user(optval, r_data, r_len))
1636                         return -EFAULT;
1637                 if (put_user(r_len, optlen))
1638                         return -EFAULT;
1639         }
1640
1641         return 0;
1642 }
1643
1644
1645 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1646 {
1647         struct sk_buff *skb;
1648         int len = 0;
1649
1650         if (flags & MSG_OOB)
1651                 return !skb_queue_empty(q) ? 1 : 0;
1652
1653         skb_queue_walk(q, skb) {
1654                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1655                 len += skb->len;
1656
1657                 if (cb->nsp_flags & 0x40) {
1658                         /* SOCK_SEQPACKET reads to EOM */
1659                         if (sk->sk_type == SOCK_SEQPACKET)
1660                                 return 1;
1661                         /* so does SOCK_STREAM unless WAITALL is specified */
1662                         if (!(flags & MSG_WAITALL))
1663                                 return 1;
1664                 }
1665
1666                 /* minimum data length for read exceeded */
1667                 if (len >= target)
1668                         return 1;
1669         }
1670
1671         return 0;
1672 }
1673
1674
1675 static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1676                       int flags)
1677 {
1678         struct sock *sk = sock->sk;
1679         struct dn_scp *scp = DN_SK(sk);
1680         struct sk_buff_head *queue = &sk->sk_receive_queue;
1681         size_t target = size > 1 ? 1 : 0;
1682         size_t copied = 0;
1683         int rv = 0;
1684         struct sk_buff *skb, *n;
1685         struct dn_skb_cb *cb = NULL;
1686         unsigned char eor = 0;
1687         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1688
1689         lock_sock(sk);
1690
1691         if (sock_flag(sk, SOCK_ZAPPED)) {
1692                 rv = -EADDRNOTAVAIL;
1693                 goto out;
1694         }
1695
1696         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1697                 rv = 0;
1698                 goto out;
1699         }
1700
1701         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1702         if (rv)
1703                 goto out;
1704
1705         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1706                 rv = -EOPNOTSUPP;
1707                 goto out;
1708         }
1709
1710         if (flags & MSG_OOB)
1711                 queue = &scp->other_receive_queue;
1712
1713         if (flags & MSG_WAITALL)
1714                 target = size;
1715
1716
1717         /*
1718          * See if there is data ready to read, sleep if there isn't
1719          */
1720         for(;;) {
1721                 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1722
1723                 if (sk->sk_err)
1724                         goto out;
1725
1726                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1727                         if (!(flags & MSG_OOB)) {
1728                                 msg->msg_flags |= MSG_OOB;
1729                                 if (!scp->other_report) {
1730                                         scp->other_report = 1;
1731                                         goto out;
1732                                 }
1733                         }
1734                 }
1735
1736                 if (scp->state != DN_RUN)
1737                         goto out;
1738
1739                 if (signal_pending(current)) {
1740                         rv = sock_intr_errno(timeo);
1741                         goto out;
1742                 }
1743
1744                 if (dn_data_ready(sk, queue, flags, target))
1745                         break;
1746
1747                 if (flags & MSG_DONTWAIT) {
1748                         rv = -EWOULDBLOCK;
1749                         goto out;
1750                 }
1751
1752                 add_wait_queue(sk_sleep(sk), &wait);
1753                 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1754                 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1755                 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1756                 remove_wait_queue(sk_sleep(sk), &wait);
1757         }
1758
1759         skb_queue_walk_safe(queue, skb, n) {
1760                 unsigned int chunk = skb->len;
1761                 cb = DN_SKB_CB(skb);
1762
1763                 if ((chunk + copied) > size)
1764                         chunk = size - copied;
1765
1766                 if (memcpy_to_msg(msg, skb->data, chunk)) {
1767                         rv = -EFAULT;
1768                         break;
1769                 }
1770                 copied += chunk;
1771
1772                 if (!(flags & MSG_PEEK))
1773                         skb_pull(skb, chunk);
1774
1775                 eor = cb->nsp_flags & 0x40;
1776
1777                 if (skb->len == 0) {
1778                         skb_unlink(skb, queue);
1779                         kfree_skb(skb);
1780                         /*
1781                          * N.B. Don't refer to skb or cb after this point
1782                          * in loop.
1783                          */
1784                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1785                                 scp->flowloc_sw = DN_SEND;
1786                                 dn_nsp_send_link(sk, DN_SEND, 0);
1787                         }
1788                 }
1789
1790                 if (eor) {
1791                         if (sk->sk_type == SOCK_SEQPACKET)
1792                                 break;
1793                         if (!(flags & MSG_WAITALL))
1794                                 break;
1795                 }
1796
1797                 if (flags & MSG_OOB)
1798                         break;
1799
1800                 if (copied >= target)
1801                         break;
1802         }
1803
1804         rv = copied;
1805
1806
1807         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1808                 msg->msg_flags |= MSG_EOR;
1809
1810 out:
1811         if (rv == 0)
1812                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1813
1814         if ((rv >= 0) && msg->msg_name) {
1815                 __sockaddr_check_size(sizeof(struct sockaddr_dn));
1816                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1817                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1818         }
1819
1820         release_sock(sk);
1821
1822         return rv;
1823 }
1824
1825
1826 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1827 {
1828         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1829         if (skb_queue_len(queue) >= scp->snd_window)
1830                 return 1;
1831         if (fctype != NSP_FC_NONE) {
1832                 if (flags & MSG_OOB) {
1833                         if (scp->flowrem_oth == 0)
1834                                 return 1;
1835                 } else {
1836                         if (scp->flowrem_dat == 0)
1837                                 return 1;
1838                 }
1839         }
1840         return 0;
1841 }
1842
1843 /*
1844  * The DECnet spec requires that the "routing layer" accepts packets which
1845  * are at least 230 bytes in size. This excludes any headers which the NSP
1846  * layer might add, so we always assume that we'll be using the maximal
1847  * length header on data packets. The variation in length is due to the
1848  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1849  * make much practical difference.
1850  */
1851 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1852 {
1853         unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1854         if (dev) {
1855                 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1856                 mtu -= LL_RESERVED_SPACE(dev);
1857                 if (dn_db->use_long)
1858                         mtu -= 21;
1859                 else
1860                         mtu -= 6;
1861                 mtu -= DN_MAX_NSP_DATA_HEADER;
1862         } else {
1863                 /*
1864                  * 21 = long header, 16 = guess at MAC header length
1865                  */
1866                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1867         }
1868         if (mtu > mss)
1869                 mss = mtu;
1870         return mss;
1871 }
1872
1873 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1874 {
1875         struct dst_entry *dst = __sk_dst_get(sk);
1876         struct dn_scp *scp = DN_SK(sk);
1877         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1878
1879         /* Other data messages are limited to 16 bytes per packet */
1880         if (flags & MSG_OOB)
1881                 return 16;
1882
1883         /* This works out the maximum size of segment we can send out */
1884         if (dst) {
1885                 u32 mtu = dst_mtu(dst);
1886                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1887         }
1888
1889         return mss_now;
1890 }
1891
1892 /*
1893  * N.B. We get the timeout wrong here, but then we always did get it
1894  * wrong before and this is another step along the road to correcting
1895  * it. It ought to get updated each time we pass through the routine,
1896  * but in practise it probably doesn't matter too much for now.
1897  */
1898 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1899                               unsigned long datalen, int noblock,
1900                               int *errcode)
1901 {
1902         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1903                                                    noblock, errcode);
1904         if (skb) {
1905                 skb->protocol = htons(ETH_P_DNA_RT);
1906                 skb->pkt_type = PACKET_OUTGOING;
1907         }
1908         return skb;
1909 }
1910
1911 static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1912 {
1913         struct sock *sk = sock->sk;
1914         struct dn_scp *scp = DN_SK(sk);
1915         size_t mss;
1916         struct sk_buff_head *queue = &scp->data_xmit_queue;
1917         int flags = msg->msg_flags;
1918         int err = 0;
1919         size_t sent = 0;
1920         int addr_len = msg->msg_namelen;
1921         DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1922         struct sk_buff *skb = NULL;
1923         struct dn_skb_cb *cb;
1924         size_t len;
1925         unsigned char fctype;
1926         long timeo;
1927
1928         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1929                 return -EOPNOTSUPP;
1930
1931         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1932                 return -EINVAL;
1933
1934         lock_sock(sk);
1935         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1936         /*
1937          * The only difference between stream sockets and sequenced packet
1938          * sockets is that the stream sockets always behave as if MSG_EOR
1939          * has been set.
1940          */
1941         if (sock->type == SOCK_STREAM) {
1942                 if (flags & MSG_EOR) {
1943                         err = -EINVAL;
1944                         goto out;
1945                 }
1946                 flags |= MSG_EOR;
1947         }
1948
1949
1950         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1951         if (err)
1952                 goto out_err;
1953
1954         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1955                 err = -EPIPE;
1956                 if (!(flags & MSG_NOSIGNAL))
1957                         send_sig(SIGPIPE, current, 0);
1958                 goto out_err;
1959         }
1960
1961         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1962                 dst_negative_advice(sk);
1963
1964         mss = scp->segsize_rem;
1965         fctype = scp->services_rem & NSP_FC_MASK;
1966
1967         mss = dn_current_mss(sk, flags);
1968
1969         if (flags & MSG_OOB) {
1970                 queue = &scp->other_xmit_queue;
1971                 if (size > mss) {
1972                         err = -EMSGSIZE;
1973                         goto out;
1974                 }
1975         }
1976
1977         scp->persist_fxn = dn_nsp_xmit_timeout;
1978
1979         while(sent < size) {
1980                 err = sock_error(sk);
1981                 if (err)
1982                         goto out;
1983
1984                 if (signal_pending(current)) {
1985                         err = sock_intr_errno(timeo);
1986                         goto out;
1987                 }
1988
1989                 /*
1990                  * Calculate size that we wish to send.
1991                  */
1992                 len = size - sent;
1993
1994                 if (len > mss)
1995                         len = mss;
1996
1997                 /*
1998                  * Wait for queue size to go down below the window
1999                  * size.
2000                  */
2001                 if (dn_queue_too_long(scp, queue, flags)) {
2002                         DEFINE_WAIT_FUNC(wait, woken_wake_function);
2003
2004                         if (flags & MSG_DONTWAIT) {
2005                                 err = -EWOULDBLOCK;
2006                                 goto out;
2007                         }
2008
2009                         add_wait_queue(sk_sleep(sk), &wait);
2010                         sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2011                         sk_wait_event(sk, &timeo,
2012                                       !dn_queue_too_long(scp, queue, flags), &wait);
2013                         sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2014                         remove_wait_queue(sk_sleep(sk), &wait);
2015                         continue;
2016                 }
2017
2018                 /*
2019                  * Get a suitably sized skb.
2020                  * 64 is a bit of a hack really, but its larger than any
2021                  * link-layer headers and has served us well as a good
2022                  * guess as to their real length.
2023                  */
2024                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2025                                          flags & MSG_DONTWAIT, &err);
2026
2027                 if (err)
2028                         break;
2029
2030                 if (!skb)
2031                         continue;
2032
2033                 cb = DN_SKB_CB(skb);
2034
2035                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2036
2037                 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2038                         err = -EFAULT;
2039                         goto out;
2040                 }
2041
2042                 if (flags & MSG_OOB) {
2043                         cb->nsp_flags = 0x30;
2044                         if (fctype != NSP_FC_NONE)
2045                                 scp->flowrem_oth--;
2046                 } else {
2047                         cb->nsp_flags = 0x00;
2048                         if (scp->seg_total == 0)
2049                                 cb->nsp_flags |= 0x20;
2050
2051                         scp->seg_total += len;
2052
2053                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2054                                 cb->nsp_flags |= 0x40;
2055                                 scp->seg_total = 0;
2056                                 if (fctype == NSP_FC_SCMC)
2057                                         scp->flowrem_dat--;
2058                         }
2059                         if (fctype == NSP_FC_SRC)
2060                                 scp->flowrem_dat--;
2061                 }
2062
2063                 sent += len;
2064                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2065                 skb = NULL;
2066
2067                 scp->persist = dn_nsp_persist(sk);
2068
2069         }
2070 out:
2071
2072         kfree_skb(skb);
2073
2074         release_sock(sk);
2075
2076         return sent ? sent : err;
2077
2078 out_err:
2079         err = sk_stream_error(sk, flags, err);
2080         release_sock(sk);
2081         return err;
2082 }
2083
2084 static int dn_device_event(struct notifier_block *this, unsigned long event,
2085                            void *ptr)
2086 {
2087         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2088
2089         if (!net_eq(dev_net(dev), &init_net))
2090                 return NOTIFY_DONE;
2091
2092         switch (event) {
2093         case NETDEV_UP:
2094                 dn_dev_up(dev);
2095                 break;
2096         case NETDEV_DOWN:
2097                 dn_dev_down(dev);
2098                 break;
2099         default:
2100                 break;
2101         }
2102
2103         return NOTIFY_DONE;
2104 }
2105
2106 static struct notifier_block dn_dev_notifier = {
2107         .notifier_call = dn_device_event,
2108 };
2109
2110 static struct packet_type dn_dix_packet_type __read_mostly = {
2111         .type =         cpu_to_be16(ETH_P_DNA_RT),
2112         .func =         dn_route_rcv,
2113 };
2114
2115 #ifdef CONFIG_PROC_FS
2116 struct dn_iter_state {
2117         int bucket;
2118 };
2119
2120 static struct sock *dn_socket_get_first(struct seq_file *seq)
2121 {
2122         struct dn_iter_state *state = seq->private;
2123         struct sock *n = NULL;
2124
2125         for(state->bucket = 0;
2126             state->bucket < DN_SK_HASH_SIZE;
2127             ++state->bucket) {
2128                 n = sk_head(&dn_sk_hash[state->bucket]);
2129                 if (n)
2130                         break;
2131         }
2132
2133         return n;
2134 }
2135
2136 static struct sock *dn_socket_get_next(struct seq_file *seq,
2137                                        struct sock *n)
2138 {
2139         struct dn_iter_state *state = seq->private;
2140
2141         n = sk_next(n);
2142 try_again:
2143         if (n)
2144                 goto out;
2145         if (++state->bucket >= DN_SK_HASH_SIZE)
2146                 goto out;
2147         n = sk_head(&dn_sk_hash[state->bucket]);
2148         goto try_again;
2149 out:
2150         return n;
2151 }
2152
2153 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2154 {
2155         struct sock *sk = dn_socket_get_first(seq);
2156
2157         if (sk) {
2158                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2159                         --*pos;
2160         }
2161         return *pos ? NULL : sk;
2162 }
2163
2164 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2165 {
2166         void *rc;
2167         read_lock_bh(&dn_hash_lock);
2168         rc = socket_get_idx(seq, &pos);
2169         if (!rc) {
2170                 read_unlock_bh(&dn_hash_lock);
2171         }
2172         return rc;
2173 }
2174
2175 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2176 {
2177         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2178 }
2179
2180 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2181 {
2182         void *rc;
2183
2184         if (v == SEQ_START_TOKEN) {
2185                 rc = dn_socket_get_idx(seq, 0);
2186                 goto out;
2187         }
2188
2189         rc = dn_socket_get_next(seq, v);
2190         if (rc)
2191                 goto out;
2192         read_unlock_bh(&dn_hash_lock);
2193 out:
2194         ++*pos;
2195         return rc;
2196 }
2197
2198 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2199 {
2200         if (v && v != SEQ_START_TOKEN)
2201                 read_unlock_bh(&dn_hash_lock);
2202 }
2203
2204 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2205
2206 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2207 {
2208         int i;
2209
2210         switch (le16_to_cpu(dn->sdn_objnamel)) {
2211         case 0:
2212                 sprintf(buf, "%d", dn->sdn_objnum);
2213                 break;
2214         default:
2215                 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2216                         buf[i] = dn->sdn_objname[i];
2217                         if (IS_NOT_PRINTABLE(buf[i]))
2218                                 buf[i] = '.';
2219                 }
2220                 buf[i] = 0;
2221         }
2222 }
2223
2224 static char *dn_state2asc(unsigned char state)
2225 {
2226         switch (state) {
2227         case DN_O:
2228                 return "OPEN";
2229         case DN_CR:
2230                 return "  CR";
2231         case DN_DR:
2232                 return "  DR";
2233         case DN_DRC:
2234                 return " DRC";
2235         case DN_CC:
2236                 return "  CC";
2237         case DN_CI:
2238                 return "  CI";
2239         case DN_NR:
2240                 return "  NR";
2241         case DN_NC:
2242                 return "  NC";
2243         case DN_CD:
2244                 return "  CD";
2245         case DN_RJ:
2246                 return "  RJ";
2247         case DN_RUN:
2248                 return " RUN";
2249         case DN_DI:
2250                 return "  DI";
2251         case DN_DIC:
2252                 return " DIC";
2253         case DN_DN:
2254                 return "  DN";
2255         case DN_CL:
2256                 return "  CL";
2257         case DN_CN:
2258                 return "  CN";
2259         }
2260
2261         return "????";
2262 }
2263
2264 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2265 {
2266         struct dn_scp *scp = DN_SK(sk);
2267         char buf1[DN_ASCBUF_LEN];
2268         char buf2[DN_ASCBUF_LEN];
2269         char local_object[DN_MAXOBJL+3];
2270         char remote_object[DN_MAXOBJL+3];
2271
2272         dn_printable_object(&scp->addr, local_object);
2273         dn_printable_object(&scp->peer, remote_object);
2274
2275         seq_printf(seq,
2276                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2277                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2278                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2279                    scp->addrloc,
2280                    scp->numdat,
2281                    scp->numoth,
2282                    scp->ackxmt_dat,
2283                    scp->ackxmt_oth,
2284                    scp->flowloc_sw,
2285                    local_object,
2286                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2287                    scp->addrrem,
2288                    scp->numdat_rcv,
2289                    scp->numoth_rcv,
2290                    scp->ackrcv_dat,
2291                    scp->ackrcv_oth,
2292                    scp->flowrem_sw,
2293                    remote_object,
2294                    dn_state2asc(scp->state),
2295                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2296 }
2297
2298 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2299 {
2300         if (v == SEQ_START_TOKEN) {
2301                 seq_puts(seq, "Local                                              Remote\n");
2302         } else {
2303                 dn_socket_format_entry(seq, v);
2304         }
2305         return 0;
2306 }
2307
2308 static const struct seq_operations dn_socket_seq_ops = {
2309         .start  = dn_socket_seq_start,
2310         .next   = dn_socket_seq_next,
2311         .stop   = dn_socket_seq_stop,
2312         .show   = dn_socket_seq_show,
2313 };
2314 #endif
2315
2316 static const struct net_proto_family    dn_family_ops = {
2317         .family =       AF_DECnet,
2318         .create =       dn_create,
2319         .owner  =       THIS_MODULE,
2320 };
2321
2322 static const struct proto_ops dn_proto_ops = {
2323         .family =       AF_DECnet,
2324         .owner =        THIS_MODULE,
2325         .release =      dn_release,
2326         .bind =         dn_bind,
2327         .connect =      dn_connect,
2328         .socketpair =   sock_no_socketpair,
2329         .accept =       dn_accept,
2330         .getname =      dn_getname,
2331         .poll =         dn_poll,
2332         .ioctl =        dn_ioctl,
2333         .listen =       dn_listen,
2334         .shutdown =     dn_shutdown,
2335         .setsockopt =   dn_setsockopt,
2336         .getsockopt =   dn_getsockopt,
2337         .sendmsg =      dn_sendmsg,
2338         .recvmsg =      dn_recvmsg,
2339         .mmap =         sock_no_mmap,
2340         .sendpage =     sock_no_sendpage,
2341 };
2342
2343 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2344 MODULE_AUTHOR("Linux DECnet Project Team");
2345 MODULE_LICENSE("GPL");
2346 MODULE_ALIAS_NETPROTO(PF_DECnet);
2347
2348 static const char banner[] __initconst = KERN_INFO
2349 "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2350
2351 static int __init decnet_init(void)
2352 {
2353         int rc;
2354
2355         printk(banner);
2356
2357         rc = proto_register(&dn_proto, 1);
2358         if (rc != 0)
2359                 goto out;
2360
2361         dn_neigh_init();
2362         dn_dev_init();
2363         dn_route_init();
2364         dn_fib_init();
2365
2366         sock_register(&dn_family_ops);
2367         dev_add_pack(&dn_dix_packet_type);
2368         register_netdevice_notifier(&dn_dev_notifier);
2369
2370         proc_create_seq_private("decnet", 0444, init_net.proc_net,
2371                         &dn_socket_seq_ops, sizeof(struct dn_iter_state),
2372                         NULL);
2373         dn_register_sysctl();
2374 out:
2375         return rc;
2376
2377 }
2378 module_init(decnet_init);
2379
2380 /*
2381  * Prevent DECnet module unloading until its fixed properly.
2382  * Requires an audit of the code to check for memory leaks and
2383  * initialisation problems etc.
2384  */
2385 #if 0
2386 static void __exit decnet_exit(void)
2387 {
2388         sock_unregister(AF_DECnet);
2389         rtnl_unregister_all(PF_DECnet);
2390         dev_remove_pack(&dn_dix_packet_type);
2391
2392         dn_unregister_sysctl();
2393
2394         unregister_netdevice_notifier(&dn_dev_notifier);
2395
2396         dn_route_cleanup();
2397         dn_dev_cleanup();
2398         dn_neigh_cleanup();
2399         dn_fib_cleanup();
2400
2401         remove_proc_entry("decnet", init_net.proc_net);
2402
2403         proto_unregister(&dn_proto);
2404
2405         rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2406 }
2407 module_exit(decnet_exit);
2408 #endif