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         init_timer(&scp->delack_timer);
 537         scp->delack_pending = 0;
 538         scp->delack_fxn = dn_nsp_delayed_ack;
 539
 540         dn_start_slow_timer(sk);
 541 out:
 542         return sk;
 543 }
 544
 545 /*
 546  * Keepalive timer.
 547  * FIXME: Should respond to SO_KEEPALIVE etc.
 548  */
 549 static void dn_keepalive(struct sock *sk)
 550 {
 551         struct dn_scp *scp = DN_SK(sk);
 552
 553         /*
 554          * By checking the other_data transmit queue is empty
 555          * we are double checking that we are not sending too
 556          * many of these keepalive frames.
 557          */
 558         if (skb_queue_empty(&scp->other_xmit_queue))
 559                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 560 }
 561
 562
 563 /*
 564  * Timer for shutdown/destroyed sockets.
 565  * When socket is dead & no packets have been sent for a
 566  * certain amount of time, they are removed by this
 567  * routine. Also takes care of sending out DI & DC
 568  * frames at correct times.
 569  */
 570 int dn_destroy_timer(struct sock *sk)
 571 {
 572         struct dn_scp *scp = DN_SK(sk);
 573
 574         scp->persist = dn_nsp_persist(sk);
 575
 576         switch (scp->state) {
 577         case DN_DI:
 578                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 579                 if (scp->nsp_rxtshift >= decnet_di_count)
 580                         scp->state = DN_CN;
 581                 return 0;
 582
 583         case DN_DR:
 584                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 585                 if (scp->nsp_rxtshift >= decnet_dr_count)
 586                         scp->state = DN_DRC;
 587                 return 0;
 588
 589         case DN_DN:
 590                 if (scp->nsp_rxtshift < decnet_dn_count) {
 591                         /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 592                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 593                                          GFP_ATOMIC);
 594                         return 0;
 595                 }
 596         }
 597
 598         scp->persist = (HZ * decnet_time_wait);
 599
 600         if (sk->sk_socket)
 601                 return 0;
 602
 603         if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
 604                 dn_unhash_sock(sk);
 605                 sock_put(sk);
 606                 return 1;
 607         }
 608
 609         return 0;
 610 }
 611
 612 static void dn_destroy_sock(struct sock *sk)
 613 {
 614         struct dn_scp *scp = DN_SK(sk);
 615
 616         scp->nsp_rxtshift = 0; /* reset back off */
 617
 618         if (sk->sk_socket) {
 619                 if (sk->sk_socket->state != SS_UNCONNECTED)
 620                         sk->sk_socket->state = SS_DISCONNECTING;
 621         }
 622
 623         sk->sk_state = TCP_CLOSE;
 624
 625         switch (scp->state) {
 626         case DN_DN:
 627                 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 628                                  sk->sk_allocation);
 629                 scp->persist_fxn = dn_destroy_timer;
 630                 scp->persist = dn_nsp_persist(sk);
 631                 break;
 632         case DN_CR:
 633                 scp->state = DN_DR;
 634                 goto disc_reject;
 635         case DN_RUN:
 636                 scp->state = DN_DI;
 637         case DN_DI:
 638         case DN_DR:
 639 disc_reject:
 640                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 641         case DN_NC:
 642         case DN_NR:
 643         case DN_RJ:
 644         case DN_DIC:
 645         case DN_CN:
 646         case DN_DRC:
 647         case DN_CI:
 648         case DN_CD:
 649                 scp->persist_fxn = dn_destroy_timer;
 650                 scp->persist = dn_nsp_persist(sk);
 651                 break;
 652         default:
 653                 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 654         case DN_O:
 655                 dn_stop_slow_timer(sk);
 656
 657                 dn_unhash_sock_bh(sk);
 658                 sock_put(sk);
 659
 660                 break;
 661         }
 662 }
 663
 664 char *dn_addr2asc(__u16 addr, char *buf)
 665 {
 666         unsigned short node, area;
 667
 668         node = addr & 0x03ff;
 669         area = addr >> 10;
 670         sprintf(buf, "%hd.%hd", area, node);
 671
 672         return buf;
 673 }
 674
 675
 676
 677 static int dn_create(struct net *net, struct socket *sock, int protocol,
 678                      int kern)
 679 {
 680         struct sock *sk;
 681
 682         if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
 683                 return -EINVAL;
 684
 685         if (!net_eq(net, &init_net))
 686                 return -EAFNOSUPPORT;
 687
 688         switch (sock->type) {
 689         case SOCK_SEQPACKET:
 690                 if (protocol != DNPROTO_NSP)
 691                         return -EPROTONOSUPPORT;
 692                 break;
 693         case SOCK_STREAM:
 694                 break;
 695         default:
 696                 return -ESOCKTNOSUPPORT;
 697         }
 698
 699
 700         if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL)
 701                 return -ENOBUFS;
 702
 703         sk->sk_protocol = protocol;
 704
 705         return 0;
 706 }
 707
 708
 709 static int
 710 dn_release(struct socket *sock)
 711 {
 712         struct sock *sk = sock->sk;
 713
 714         if (sk) {
 715                 sock_orphan(sk);
 716                 sock_hold(sk);
 717                 lock_sock(sk);
 718                 dn_destroy_sock(sk);
 719                 release_sock(sk);
 720                 sock_put(sk);
 721         }
 722
 723         return 0;
 724 }
 725
 726 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 727 {
 728         struct sock *sk = sock->sk;
 729         struct dn_scp *scp = DN_SK(sk);
 730         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 731         struct net_device *dev, *ldev;
 732         int rv;
 733
 734         if (addr_len != sizeof(struct sockaddr_dn))
 735                 return -EINVAL;
 736
 737         if (saddr->sdn_family != AF_DECnet)
 738                 return -EINVAL;
 739
 740         if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
 741                 return -EINVAL;
 742
 743         if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
 744                 return -EINVAL;
 745
 746         if (saddr->sdn_flags & ~SDF_WILD)
 747                 return -EINVAL;
 748
 749         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 750             (saddr->sdn_flags & SDF_WILD)))
 751                 return -EACCES;
 752
 753         if (!(saddr->sdn_flags & SDF_WILD)) {
 754                 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
 755                         rcu_read_lock();
 756                         ldev = NULL;
 757                         for_each_netdev_rcu(&init_net, dev) {
 758                                 if (!dev->dn_ptr)
 759                                         continue;
 760                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 761                                         ldev = dev;
 762                                         break;
 763                                 }
 764                         }
 765                         rcu_read_unlock();
 766                         if (ldev == NULL)
 767                                 return -EADDRNOTAVAIL;
 768                 }
 769         }
 770
 771         rv = -EINVAL;
 772         lock_sock(sk);
 773         if (sock_flag(sk, SOCK_ZAPPED)) {
 774                 memcpy(&scp->addr, saddr, addr_len);
 775                 sock_reset_flag(sk, SOCK_ZAPPED);
 776
 777                 rv = dn_hash_sock(sk);
 778                 if (rv)
 779                         sock_set_flag(sk, SOCK_ZAPPED);
 780         }
 781         release_sock(sk);
 782
 783         return rv;
 784 }
 785
 786
 787 static int dn_auto_bind(struct socket *sock)
 788 {
 789         struct sock *sk = sock->sk;
 790         struct dn_scp *scp = DN_SK(sk);
 791         int rv;
 792
 793         sock_reset_flag(sk, SOCK_ZAPPED);
 794
 795         scp->addr.sdn_flags  = 0;
 796         scp->addr.sdn_objnum = 0;
 797
 798         /*
 799          * This stuff is to keep compatibility with Eduardo's
 800          * patch. I hope I can dispense with it shortly...
 801          */
 802         if ((scp->accessdata.acc_accl != 0) &&
 803                 (scp->accessdata.acc_accl <= 12)) {
 804
 805                 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
 806                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
 807
 808                 scp->accessdata.acc_accl = 0;
 809                 memset(scp->accessdata.acc_acc, 0, 40);
 810         }
 811         /* End of compatibility stuff */
 812
 813         scp->addr.sdn_add.a_len = cpu_to_le16(2);
 814         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 815         if (rv == 0) {
 816                 rv = dn_hash_sock(sk);
 817                 if (rv)
 818                         sock_set_flag(sk, SOCK_ZAPPED);
 819         }
 820
 821         return rv;
 822 }
 823
 824 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 825 {
 826         struct dn_scp *scp = DN_SK(sk);
 827         DEFINE_WAIT(wait);
 828         int err;
 829
 830         if (scp->state != DN_CR)
 831                 return -EINVAL;
 832
 833         scp->state = DN_CC;
 834         scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
 835         dn_send_conn_conf(sk, allocation);
 836
 837         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 838         for(;;) {
 839                 release_sock(sk);
 840                 if (scp->state == DN_CC)
 841                         *timeo = schedule_timeout(*timeo);
 842                 lock_sock(sk);
 843                 err = 0;
 844                 if (scp->state == DN_RUN)
 845                         break;
 846                 err = sock_error(sk);
 847                 if (err)
 848                         break;
 849                 err = sock_intr_errno(*timeo);
 850                 if (signal_pending(current))
 851                         break;
 852                 err = -EAGAIN;
 853                 if (!*timeo)
 854                         break;
 855                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 856         }
 857         finish_wait(sk_sleep(sk), &wait);
 858         if (err == 0) {
 859                 sk->sk_socket->state = SS_CONNECTED;
 860         } else if (scp->state != DN_CC) {
 861                 sk->sk_socket->state = SS_UNCONNECTED;
 862         }
 863         return err;
 864 }
 865
 866 static int dn_wait_run(struct sock *sk, long *timeo)
 867 {
 868         struct dn_scp *scp = DN_SK(sk);
 869         DEFINE_WAIT(wait);
 870         int err = 0;
 871
 872         if (scp->state == DN_RUN)
 873                 goto out;
 874
 875         if (!*timeo)
 876                 return -EALREADY;
 877
 878         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 879         for(;;) {
 880                 release_sock(sk);
 881                 if (scp->state == DN_CI || scp->state == DN_CC)
 882                         *timeo = schedule_timeout(*timeo);
 883                 lock_sock(sk);
 884                 err = 0;
 885                 if (scp->state == DN_RUN)
 886                         break;
 887                 err = sock_error(sk);
 888                 if (err)
 889                         break;
 890                 err = sock_intr_errno(*timeo);
 891                 if (signal_pending(current))
 892                         break;
 893                 err = -ETIMEDOUT;
 894                 if (!*timeo)
 895                         break;
 896                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 897         }
 898         finish_wait(sk_sleep(sk), &wait);
 899 out:
 900         if (err == 0) {
 901                 sk->sk_socket->state = SS_CONNECTED;
 902         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 903                 sk->sk_socket->state = SS_UNCONNECTED;
 904         }
 905         return err;
 906 }
 907
 908 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 909 {
 910         struct socket *sock = sk->sk_socket;
 911         struct dn_scp *scp = DN_SK(sk);
 912         int err = -EISCONN;
 913         struct flowidn fld;
 914         struct dst_entry *dst;
 915
 916         if (sock->state == SS_CONNECTED)
 917                 goto out;
 918
 919         if (sock->state == SS_CONNECTING) {
 920                 err = 0;
 921                 if (scp->state == DN_RUN) {
 922                         sock->state = SS_CONNECTED;
 923                         goto out;
 924                 }
 925                 err = -ECONNREFUSED;
 926                 if (scp->state != DN_CI && scp->state != DN_CC) {
 927                         sock->state = SS_UNCONNECTED;
 928                         goto out;
 929                 }
 930                 return dn_wait_run(sk, timeo);
 931         }
 932
 933         err = -EINVAL;
 934         if (scp->state != DN_O)
 935                 goto out;
 936
 937         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 938                 goto out;
 939         if (addr->sdn_family != AF_DECnet)
 940                 goto out;
 941         if (addr->sdn_flags & SDF_WILD)
 942                 goto out;
 943
 944         if (sock_flag(sk, SOCK_ZAPPED)) {
 945                 err = dn_auto_bind(sk->sk_socket);
 946                 if (err)
 947                         goto out;
 948         }
 949
 950         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 951
 952         err = -EHOSTUNREACH;
 953         memset(&fld, 0, sizeof(fld));
 954         fld.flowidn_oif = sk->sk_bound_dev_if;
 955         fld.daddr = dn_saddr2dn(&scp->peer);
 956         fld.saddr = dn_saddr2dn(&scp->addr);
 957         dn_sk_ports_copy(&fld, scp);
 958         fld.flowidn_proto = DNPROTO_NSP;
 959         if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
 960                 goto out;
 961         dst = __sk_dst_get(sk);
 962         sk->sk_route_caps = dst->dev->features;
 963         sock->state = SS_CONNECTING;
 964         scp->state = DN_CI;
 965         scp->segsize_loc = dst_metric_advmss(dst);
 966
 967         dn_nsp_send_conninit(sk, NSP_CI);
 968         err = -EINPROGRESS;
 969         if (*timeo) {
 970                 err = dn_wait_run(sk, timeo);
 971         }
 972 out:
 973         return err;
 974 }
 975
 976 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 977 {
 978         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 979         struct sock *sk = sock->sk;
 980         int err;
 981         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 982
 983         lock_sock(sk);
 984         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 985         release_sock(sk);
 986
 987         return err;
 988 }
 989
 990 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 991 {
 992         struct dn_scp *scp = DN_SK(sk);
 993
 994         switch (scp->state) {
 995         case DN_RUN:
 996                 return 0;
 997         case DN_CR:
 998                 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 999         case DN_CI:
1000         case DN_CC:
1001                 return dn_wait_run(sk, timeo);
1002         case DN_O:
1003                 return __dn_connect(sk, addr, addrlen, timeo, flags);
1004         }
1005
1006         return -EINVAL;
1007 }
1008
1009
1010 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1011 {
1012         unsigned char *ptr = skb->data;
1013
1014         acc->acc_userl = *ptr++;
1015         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1016         ptr += acc->acc_userl;
1017
1018         acc->acc_passl = *ptr++;
1019         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1020         ptr += acc->acc_passl;
1021
1022         acc->acc_accl = *ptr++;
1023         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1024
1025         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1026
1027 }
1028
1029 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1030 {
1031         unsigned char *ptr = skb->data;
1032         u16 len = *ptr++; /* yes, it's 8bit on the wire */
1033
1034         BUG_ON(len > 16); /* we've checked the contents earlier */
1035         opt->opt_optl   = cpu_to_le16(len);
1036         opt->opt_status = 0;
1037         memcpy(opt->opt_data, ptr, len);
1038         skb_pull(skb, len + 1);
1039 }
1040
1041 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1042 {
1043         DEFINE_WAIT(wait);
1044         struct sk_buff *skb = NULL;
1045         int err = 0;
1046
1047         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1048         for(;;) {
1049                 release_sock(sk);
1050                 skb = skb_dequeue(&sk->sk_receive_queue);
1051                 if (skb == NULL) {
1052                         *timeo = schedule_timeout(*timeo);
1053                         skb = skb_dequeue(&sk->sk_receive_queue);
1054                 }
1055                 lock_sock(sk);
1056                 if (skb != NULL)
1057                         break;
1058                 err = -EINVAL;
1059                 if (sk->sk_state != TCP_LISTEN)
1060                         break;
1061                 err = sock_intr_errno(*timeo);
1062                 if (signal_pending(current))
1063                         break;
1064                 err = -EAGAIN;
1065                 if (!*timeo)
1066                         break;
1067                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1068         }
1069         finish_wait(sk_sleep(sk), &wait);
1070
1071         return skb == NULL ? ERR_PTR(err) : skb;
1072 }
1073
1074 static int dn_accept(struct socket *sock, struct socket *newsock, int flags,
1075                      bool kern)
1076 {
1077         struct sock *sk = sock->sk, *newsk;
1078         struct sk_buff *skb = NULL;
1079         struct dn_skb_cb *cb;
1080         unsigned char menuver;
1081         int err = 0;
1082         unsigned char type;
1083         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1084         struct dst_entry *dst;
1085
1086         lock_sock(sk);
1087
1088         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1089                 release_sock(sk);
1090                 return -EINVAL;
1091         }
1092
1093         skb = skb_dequeue(&sk->sk_receive_queue);
1094         if (skb == NULL) {
1095                 skb = dn_wait_for_connect(sk, &timeo);
1096                 if (IS_ERR(skb)) {
1097                         release_sock(sk);
1098                         return PTR_ERR(skb);
1099                 }
1100         }
1101
1102         cb = DN_SKB_CB(skb);
1103         sk->sk_ack_backlog--;
1104         newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1105         if (newsk == NULL) {
1106                 release_sock(sk);
1107                 kfree_skb(skb);
1108                 return -ENOBUFS;
1109         }
1110         release_sock(sk);
1111
1112         dst = skb_dst(skb);
1113         sk_dst_set(newsk, dst);
1114         skb_dst_set(skb, NULL);
1115
1116         DN_SK(newsk)->state        = DN_CR;
1117         DN_SK(newsk)->addrrem      = cb->src_port;
1118         DN_SK(newsk)->services_rem = cb->services;
1119         DN_SK(newsk)->info_rem     = cb->info;
1120         DN_SK(newsk)->segsize_rem  = cb->segsize;
1121         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1122
1123         if (DN_SK(newsk)->segsize_rem < 230)
1124                 DN_SK(newsk)->segsize_rem = 230;
1125
1126         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1127                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1128
1129         newsk->sk_state  = TCP_LISTEN;
1130         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1131
1132         /*
1133          * If we are listening on a wild socket, we don't want
1134          * the newly created socket on the wrong hash queue.
1135          */
1136         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1137
1138         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1139         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1140         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1141         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1142
1143         menuver = *skb->data;
1144         skb_pull(skb, 1);
1145
1146         if (menuver & DN_MENUVER_ACC)
1147                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1148
1149         if (menuver & DN_MENUVER_USR)
1150                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1151
1152         if (menuver & DN_MENUVER_PRX)
1153                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1154
1155         if (menuver & DN_MENUVER_UIC)
1156                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1157
1158         kfree_skb(skb);
1159
1160         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1161                 sizeof(struct optdata_dn));
1162         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1163                 sizeof(struct optdata_dn));
1164
1165         lock_sock(newsk);
1166         err = dn_hash_sock(newsk);
1167         if (err == 0) {
1168                 sock_reset_flag(newsk, SOCK_ZAPPED);
1169                 dn_send_conn_ack(newsk);
1170
1171                 /*
1172                  * Here we use sk->sk_allocation since although the conn conf is
1173                  * for the newsk, the context is the old socket.
1174                  */
1175                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1176                         err = dn_confirm_accept(newsk, &timeo,
1177                                                 sk->sk_allocation);
1178         }
1179         release_sock(newsk);
1180         return err;
1181 }
1182
1183
1184 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1185 {
1186         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1187         struct sock *sk = sock->sk;
1188         struct dn_scp *scp = DN_SK(sk);
1189
1190         *uaddr_len = sizeof(struct sockaddr_dn);
1191
1192         lock_sock(sk);
1193
1194         if (peer) {
1195                 if ((sock->state != SS_CONNECTED &&
1196                      sock->state != SS_CONNECTING) &&
1197                     scp->accept_mode == ACC_IMMED) {
1198                         release_sock(sk);
1199                         return -ENOTCONN;
1200                 }
1201
1202                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1203         } else {
1204                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1205         }
1206
1207         release_sock(sk);
1208
1209         return 0;
1210 }
1211
1212
1213 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1214 {
1215         struct sock *sk = sock->sk;
1216         struct dn_scp *scp = DN_SK(sk);
1217         int mask = datagram_poll(file, sock, wait);
1218
1219         if (!skb_queue_empty(&scp->other_receive_queue))
1220                 mask |= POLLRDBAND;
1221
1222         return mask;
1223 }
1224
1225 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1226 {
1227         struct sock *sk = sock->sk;
1228         struct dn_scp *scp = DN_SK(sk);
1229         int err = -EOPNOTSUPP;
1230         long amount = 0;
1231         struct sk_buff *skb;
1232         int val;
1233
1234         switch(cmd)
1235         {
1236         case SIOCGIFADDR:
1237         case SIOCSIFADDR:
1238                 return dn_dev_ioctl(cmd, (void __user *)arg);
1239
1240         case SIOCATMARK:
1241                 lock_sock(sk);
1242                 val = !skb_queue_empty(&scp->other_receive_queue);
1243                 if (scp->state != DN_RUN)
1244                         val = -ENOTCONN;
1245                 release_sock(sk);
1246                 return val;
1247
1248         case TIOCOUTQ:
1249                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1250                 if (amount < 0)
1251                         amount = 0;
1252                 err = put_user(amount, (int __user *)arg);
1253                 break;
1254
1255         case TIOCINQ:
1256                 lock_sock(sk);
1257                 skb = skb_peek(&scp->other_receive_queue);
1258                 if (skb) {
1259                         amount = skb->len;
1260                 } else {
1261                         skb_queue_walk(&sk->sk_receive_queue, skb)
1262                                 amount += skb->len;
1263                 }
1264                 release_sock(sk);
1265                 err = put_user(amount, (int __user *)arg);
1266                 break;
1267
1268         default:
1269                 err = -ENOIOCTLCMD;
1270                 break;
1271         }
1272
1273         return err;
1274 }
1275
1276 static int dn_listen(struct socket *sock, int backlog)
1277 {
1278         struct sock *sk = sock->sk;
1279         int err = -EINVAL;
1280
1281         lock_sock(sk);
1282
1283         if (sock_flag(sk, SOCK_ZAPPED))
1284                 goto out;
1285
1286         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1287                 goto out;
1288
1289         sk->sk_max_ack_backlog = backlog;
1290         sk->sk_ack_backlog     = 0;
1291         sk->sk_state           = TCP_LISTEN;
1292         err                 = 0;
1293         dn_rehash_sock(sk);
1294
1295 out:
1296         release_sock(sk);
1297
1298         return err;
1299 }
1300
1301
1302 static int dn_shutdown(struct socket *sock, int how)
1303 {
1304         struct sock *sk = sock->sk;
1305         struct dn_scp *scp = DN_SK(sk);
1306         int err = -ENOTCONN;
1307
1308         lock_sock(sk);
1309
1310         if (sock->state == SS_UNCONNECTED)
1311                 goto out;
1312
1313         err = 0;
1314         if (sock->state == SS_DISCONNECTING)
1315                 goto out;
1316
1317         err = -EINVAL;
1318         if (scp->state == DN_O)
1319                 goto out;
1320
1321         if (how != SHUT_RDWR)
1322                 goto out;
1323
1324         sk->sk_shutdown = SHUTDOWN_MASK;
1325         dn_destroy_sock(sk);
1326         err = 0;
1327
1328 out:
1329         release_sock(sk);
1330
1331         return err;
1332 }
1333
1334 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1335 {
1336         struct sock *sk = sock->sk;
1337         int err;
1338
1339         lock_sock(sk);
1340         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1341         release_sock(sk);
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         default:
1450 #ifdef CONFIG_NETFILTER
1451                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1452 #endif
1453         case DSO_LINKINFO:
1454         case DSO_STREAM:
1455         case DSO_SEQPACKET:
1456                 return -ENOPROTOOPT;
1457
1458         case DSO_MAXWINDOW:
1459                 if (optlen != sizeof(unsigned long))
1460                         return -EINVAL;
1461                 if (u.win > NSP_MAX_WINDOW)
1462                         u.win = NSP_MAX_WINDOW;
1463                 if (u.win == 0)
1464                         return -EINVAL;
1465                 scp->max_window = u.win;
1466                 if (scp->snd_window > u.win)
1467                         scp->snd_window = u.win;
1468                 break;
1469
1470         case DSO_NODELAY:
1471                 if (optlen != sizeof(int))
1472                         return -EINVAL;
1473                 if (scp->nonagle == TCP_NAGLE_CORK)
1474                         return -EINVAL;
1475                 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
1476                 /* if (scp->nonagle == 1) { Push pending frames } */
1477                 break;
1478
1479         case DSO_CORK:
1480                 if (optlen != sizeof(int))
1481                         return -EINVAL;
1482                 if (scp->nonagle == TCP_NAGLE_OFF)
1483                         return -EINVAL;
1484                 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
1485                 /* if (scp->nonagle == 0) { Push pending frames } */
1486                 break;
1487
1488         case DSO_SERVICES:
1489                 if (optlen != sizeof(unsigned char))
1490                         return -EINVAL;
1491                 if ((u.services & ~NSP_FC_MASK) != 0x01)
1492                         return -EINVAL;
1493                 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1494                         return -EINVAL;
1495                 scp->services_loc = u.services;
1496                 break;
1497
1498         case DSO_INFO:
1499                 if (optlen != sizeof(unsigned char))
1500                         return -EINVAL;
1501                 if (u.info & 0xfc)
1502                         return -EINVAL;
1503                 scp->info_loc = u.info;
1504                 break;
1505         }
1506
1507         return 0;
1508 }
1509
1510 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1511 {
1512         struct sock *sk = sock->sk;
1513         int err;
1514
1515         lock_sock(sk);
1516         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1517         release_sock(sk);
1518
1519         return err;
1520 }
1521
1522 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1523 {
1524         struct  sock *sk = sock->sk;
1525         struct dn_scp *scp = DN_SK(sk);
1526         struct linkinfo_dn link;
1527         unsigned int r_len;
1528         void *r_data = NULL;
1529         unsigned int val;
1530
1531         if(get_user(r_len , optlen))
1532                 return -EFAULT;
1533
1534         switch (optname) {
1535         case DSO_CONDATA:
1536                 if (r_len > sizeof(struct optdata_dn))
1537                         r_len = sizeof(struct optdata_dn);
1538                 r_data = &scp->conndata_in;
1539                 break;
1540
1541         case DSO_DISDATA:
1542                 if (r_len > sizeof(struct optdata_dn))
1543                         r_len = sizeof(struct optdata_dn);
1544                 r_data = &scp->discdata_in;
1545                 break;
1546
1547         case DSO_CONACCESS:
1548                 if (r_len > sizeof(struct accessdata_dn))
1549                         r_len = sizeof(struct accessdata_dn);
1550                 r_data = &scp->accessdata;
1551                 break;
1552
1553         case DSO_ACCEPTMODE:
1554                 if (r_len > sizeof(unsigned char))
1555                         r_len = sizeof(unsigned char);
1556                 r_data = &scp->accept_mode;
1557                 break;
1558
1559         case DSO_LINKINFO:
1560                 if (r_len > sizeof(struct linkinfo_dn))
1561                         r_len = sizeof(struct linkinfo_dn);
1562
1563                 memset(&link, 0, sizeof(link));
1564
1565                 switch (sock->state) {
1566                 case SS_CONNECTING:
1567                         link.idn_linkstate = LL_CONNECTING;
1568                         break;
1569                 case SS_DISCONNECTING:
1570                         link.idn_linkstate = LL_DISCONNECTING;
1571                         break;
1572                 case SS_CONNECTED:
1573                         link.idn_linkstate = LL_RUNNING;
1574                         break;
1575                 default:
1576                         link.idn_linkstate = LL_INACTIVE;
1577                 }
1578
1579                 link.idn_segsize = scp->segsize_rem;
1580                 r_data = &link;
1581                 break;
1582
1583         default:
1584 #ifdef CONFIG_NETFILTER
1585         {
1586                 int ret, len;
1587
1588                 if (get_user(len, optlen))
1589                         return -EFAULT;
1590
1591                 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1592                 if (ret >= 0)
1593                         ret = put_user(len, optlen);
1594                 return ret;
1595         }
1596 #endif
1597         case DSO_STREAM:
1598         case DSO_SEQPACKET:
1599         case DSO_CONACCEPT:
1600         case DSO_CONREJECT:
1601                 return -ENOPROTOOPT;
1602
1603         case DSO_MAXWINDOW:
1604                 if (r_len > sizeof(unsigned long))
1605                         r_len = sizeof(unsigned long);
1606                 r_data = &scp->max_window;
1607                 break;
1608
1609         case DSO_NODELAY:
1610                 if (r_len > sizeof(int))
1611                         r_len = sizeof(int);
1612                 val = (scp->nonagle == TCP_NAGLE_OFF);
1613                 r_data = &val;
1614                 break;
1615
1616         case DSO_CORK:
1617                 if (r_len > sizeof(int))
1618                         r_len = sizeof(int);
1619                 val = (scp->nonagle == TCP_NAGLE_CORK);
1620                 r_data = &val;
1621                 break;
1622
1623         case DSO_SERVICES:
1624                 if (r_len > sizeof(unsigned char))
1625                         r_len = sizeof(unsigned char);
1626                 r_data = &scp->services_rem;
1627                 break;
1628
1629         case DSO_INFO:
1630                 if (r_len > sizeof(unsigned char))
1631                         r_len = sizeof(unsigned char);
1632                 r_data = &scp->info_rem;
1633                 break;
1634         }
1635
1636         if (r_data) {
1637                 if (copy_to_user(optval, r_data, r_len))
1638                         return -EFAULT;
1639                 if (put_user(r_len, optlen))
1640                         return -EFAULT;
1641         }
1642
1643         return 0;
1644 }
1645
1646
1647 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1648 {
1649         struct sk_buff *skb;
1650         int len = 0;
1651
1652         if (flags & MSG_OOB)
1653                 return !skb_queue_empty(q) ? 1 : 0;
1654
1655         skb_queue_walk(q, skb) {
1656                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1657                 len += skb->len;
1658
1659                 if (cb->nsp_flags & 0x40) {
1660                         /* SOCK_SEQPACKET reads to EOM */
1661                         if (sk->sk_type == SOCK_SEQPACKET)
1662                                 return 1;
1663                         /* so does SOCK_STREAM unless WAITALL is specified */
1664                         if (!(flags & MSG_WAITALL))
1665                                 return 1;
1666                 }
1667
1668                 /* minimum data length for read exceeded */
1669                 if (len >= target)
1670                         return 1;
1671         }
1672
1673         return 0;
1674 }
1675
1676
1677 static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1678                       int flags)
1679 {
1680         struct sock *sk = sock->sk;
1681         struct dn_scp *scp = DN_SK(sk);
1682         struct sk_buff_head *queue = &sk->sk_receive_queue;
1683         size_t target = size > 1 ? 1 : 0;
1684         size_t copied = 0;
1685         int rv = 0;
1686         struct sk_buff *skb, *n;
1687         struct dn_skb_cb *cb = NULL;
1688         unsigned char eor = 0;
1689         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1690
1691         lock_sock(sk);
1692
1693         if (sock_flag(sk, SOCK_ZAPPED)) {
1694                 rv = -EADDRNOTAVAIL;
1695                 goto out;
1696         }
1697
1698         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1699                 rv = 0;
1700                 goto out;
1701         }
1702
1703         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1704         if (rv)
1705                 goto out;
1706
1707         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1708                 rv = -EOPNOTSUPP;
1709                 goto out;
1710         }
1711
1712         if (flags & MSG_OOB)
1713                 queue = &scp->other_receive_queue;
1714
1715         if (flags & MSG_WAITALL)
1716                 target = size;
1717
1718
1719         /*
1720          * See if there is data ready to read, sleep if there isn't
1721          */
1722         for(;;) {
1723                 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1724
1725                 if (sk->sk_err)
1726                         goto out;
1727
1728                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1729                         if (!(flags & MSG_OOB)) {
1730                                 msg->msg_flags |= MSG_OOB;
1731                                 if (!scp->other_report) {
1732                                         scp->other_report = 1;
1733                                         goto out;
1734                                 }
1735                         }
1736                 }
1737
1738                 if (scp->state != DN_RUN)
1739                         goto out;
1740
1741                 if (signal_pending(current)) {
1742                         rv = sock_intr_errno(timeo);
1743                         goto out;
1744                 }
1745
1746                 if (dn_data_ready(sk, queue, flags, target))
1747                         break;
1748
1749                 if (flags & MSG_DONTWAIT) {
1750                         rv = -EWOULDBLOCK;
1751                         goto out;
1752                 }
1753
1754                 add_wait_queue(sk_sleep(sk), &wait);
1755                 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1756                 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1757                 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1758                 remove_wait_queue(sk_sleep(sk), &wait);
1759         }
1760
1761         skb_queue_walk_safe(queue, skb, n) {
1762                 unsigned int chunk = skb->len;
1763                 cb = DN_SKB_CB(skb);
1764
1765                 if ((chunk + copied) > size)
1766                         chunk = size - copied;
1767
1768                 if (memcpy_to_msg(msg, skb->data, chunk)) {
1769                         rv = -EFAULT;
1770                         break;
1771                 }
1772                 copied += chunk;
1773
1774                 if (!(flags & MSG_PEEK))
1775                         skb_pull(skb, chunk);
1776
1777                 eor = cb->nsp_flags & 0x40;
1778
1779                 if (skb->len == 0) {
1780                         skb_unlink(skb, queue);
1781                         kfree_skb(skb);
1782                         /*
1783                          * N.B. Don't refer to skb or cb after this point
1784                          * in loop.
1785                          */
1786                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1787                                 scp->flowloc_sw = DN_SEND;
1788                                 dn_nsp_send_link(sk, DN_SEND, 0);
1789                         }
1790                 }
1791
1792                 if (eor) {
1793                         if (sk->sk_type == SOCK_SEQPACKET)
1794                                 break;
1795                         if (!(flags & MSG_WAITALL))
1796                                 break;
1797                 }
1798
1799                 if (flags & MSG_OOB)
1800                         break;
1801
1802                 if (copied >= target)
1803                         break;
1804         }
1805
1806         rv = copied;
1807
1808
1809         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1810                 msg->msg_flags |= MSG_EOR;
1811
1812 out:
1813         if (rv == 0)
1814                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1815
1816         if ((rv >= 0) && msg->msg_name) {
1817                 __sockaddr_check_size(sizeof(struct sockaddr_dn));
1818                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1819                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1820         }
1821
1822         release_sock(sk);
1823
1824         return rv;
1825 }
1826
1827
1828 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1829 {
1830         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1831         if (skb_queue_len(queue) >= scp->snd_window)
1832                 return 1;
1833         if (fctype != NSP_FC_NONE) {
1834                 if (flags & MSG_OOB) {
1835                         if (scp->flowrem_oth == 0)
1836                                 return 1;
1837                 } else {
1838                         if (scp->flowrem_dat == 0)
1839                                 return 1;
1840                 }
1841         }
1842         return 0;
1843 }
1844
1845 /*
1846  * The DECnet spec requires that the "routing layer" accepts packets which
1847  * are at least 230 bytes in size. This excludes any headers which the NSP
1848  * layer might add, so we always assume that we'll be using the maximal
1849  * length header on data packets. The variation in length is due to the
1850  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1851  * make much practical difference.
1852  */
1853 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1854 {
1855         unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1856         if (dev) {
1857                 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1858                 mtu -= LL_RESERVED_SPACE(dev);
1859                 if (dn_db->use_long)
1860                         mtu -= 21;
1861                 else
1862                         mtu -= 6;
1863                 mtu -= DN_MAX_NSP_DATA_HEADER;
1864         } else {
1865                 /*
1866                  * 21 = long header, 16 = guess at MAC header length
1867                  */
1868                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1869         }
1870         if (mtu > mss)
1871                 mss = mtu;
1872         return mss;
1873 }
1874
1875 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1876 {
1877         struct dst_entry *dst = __sk_dst_get(sk);
1878         struct dn_scp *scp = DN_SK(sk);
1879         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1880
1881         /* Other data messages are limited to 16 bytes per packet */
1882         if (flags & MSG_OOB)
1883                 return 16;
1884
1885         /* This works out the maximum size of segment we can send out */
1886         if (dst) {
1887                 u32 mtu = dst_mtu(dst);
1888                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1889         }
1890
1891         return mss_now;
1892 }
1893
1894 /*
1895  * N.B. We get the timeout wrong here, but then we always did get it
1896  * wrong before and this is another step along the road to correcting
1897  * it. It ought to get updated each time we pass through the routine,
1898  * but in practise it probably doesn't matter too much for now.
1899  */
1900 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1901                               unsigned long datalen, int noblock,
1902                               int *errcode)
1903 {
1904         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1905                                                    noblock, errcode);
1906         if (skb) {
1907                 skb->protocol = htons(ETH_P_DNA_RT);
1908                 skb->pkt_type = PACKET_OUTGOING;
1909         }
1910         return skb;
1911 }
1912
1913 static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1914 {
1915         struct sock *sk = sock->sk;
1916         struct dn_scp *scp = DN_SK(sk);
1917         size_t mss;
1918         struct sk_buff_head *queue = &scp->data_xmit_queue;
1919         int flags = msg->msg_flags;
1920         int err = 0;
1921         size_t sent = 0;
1922         int addr_len = msg->msg_namelen;
1923         DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1924         struct sk_buff *skb = NULL;
1925         struct dn_skb_cb *cb;
1926         size_t len;
1927         unsigned char fctype;
1928         long timeo;
1929
1930         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1931                 return -EOPNOTSUPP;
1932
1933         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1934                 return -EINVAL;
1935
1936         lock_sock(sk);
1937         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1938         /*
1939          * The only difference between stream sockets and sequenced packet
1940          * sockets is that the stream sockets always behave as if MSG_EOR
1941          * has been set.
1942          */
1943         if (sock->type == SOCK_STREAM) {
1944                 if (flags & MSG_EOR) {
1945                         err = -EINVAL;
1946                         goto out;
1947                 }
1948                 flags |= MSG_EOR;
1949         }
1950
1951
1952         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1953         if (err)
1954                 goto out_err;
1955
1956         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1957                 err = -EPIPE;
1958                 if (!(flags & MSG_NOSIGNAL))
1959                         send_sig(SIGPIPE, current, 0);
1960                 goto out_err;
1961         }
1962
1963         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1964                 dst_negative_advice(sk);
1965
1966         mss = scp->segsize_rem;
1967         fctype = scp->services_rem & NSP_FC_MASK;
1968
1969         mss = dn_current_mss(sk, flags);
1970
1971         if (flags & MSG_OOB) {
1972                 queue = &scp->other_xmit_queue;
1973                 if (size > mss) {
1974                         err = -EMSGSIZE;
1975                         goto out;
1976                 }
1977         }
1978
1979         scp->persist_fxn = dn_nsp_xmit_timeout;
1980
1981         while(sent < size) {
1982                 err = sock_error(sk);
1983                 if (err)
1984                         goto out;
1985
1986                 if (signal_pending(current)) {
1987                         err = sock_intr_errno(timeo);
1988                         goto out;
1989                 }
1990
1991                 /*
1992                  * Calculate size that we wish to send.
1993                  */
1994                 len = size - sent;
1995
1996                 if (len > mss)
1997                         len = mss;
1998
1999                 /*
2000                  * Wait for queue size to go down below the window
2001                  * size.
2002                  */
2003                 if (dn_queue_too_long(scp, queue, flags)) {
2004                         DEFINE_WAIT_FUNC(wait, woken_wake_function);
2005
2006                         if (flags & MSG_DONTWAIT) {
2007                                 err = -EWOULDBLOCK;
2008                                 goto out;
2009                         }
2010
2011                         add_wait_queue(sk_sleep(sk), &wait);
2012                         sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2013                         sk_wait_event(sk, &timeo,
2014                                       !dn_queue_too_long(scp, queue, flags), &wait);
2015                         sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2016                         remove_wait_queue(sk_sleep(sk), &wait);
2017                         continue;
2018                 }
2019
2020                 /*
2021                  * Get a suitably sized skb.
2022                  * 64 is a bit of a hack really, but its larger than any
2023                  * link-layer headers and has served us well as a good
2024                  * guess as to their real length.
2025                  */
2026                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2027                                          flags & MSG_DONTWAIT, &err);
2028
2029                 if (err)
2030                         break;
2031
2032                 if (!skb)
2033                         continue;
2034
2035                 cb = DN_SKB_CB(skb);
2036
2037                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2038
2039                 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2040                         err = -EFAULT;
2041                         goto out;
2042                 }
2043
2044                 if (flags & MSG_OOB) {
2045                         cb->nsp_flags = 0x30;
2046                         if (fctype != NSP_FC_NONE)
2047                                 scp->flowrem_oth--;
2048                 } else {
2049                         cb->nsp_flags = 0x00;
2050                         if (scp->seg_total == 0)
2051                                 cb->nsp_flags |= 0x20;
2052
2053                         scp->seg_total += len;
2054
2055                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2056                                 cb->nsp_flags |= 0x40;
2057                                 scp->seg_total = 0;
2058                                 if (fctype == NSP_FC_SCMC)
2059                                         scp->flowrem_dat--;
2060                         }
2061                         if (fctype == NSP_FC_SRC)
2062                                 scp->flowrem_dat--;
2063                 }
2064
2065                 sent += len;
2066                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2067                 skb = NULL;
2068
2069                 scp->persist = dn_nsp_persist(sk);
2070
2071         }
2072 out:
2073
2074         kfree_skb(skb);
2075
2076         release_sock(sk);
2077
2078         return sent ? sent : err;
2079
2080 out_err:
2081         err = sk_stream_error(sk, flags, err);
2082         release_sock(sk);
2083         return err;
2084 }
2085
2086 static int dn_device_event(struct notifier_block *this, unsigned long event,
2087                            void *ptr)
2088 {
2089         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2090
2091         if (!net_eq(dev_net(dev), &init_net))
2092                 return NOTIFY_DONE;
2093
2094         switch (event) {
2095         case NETDEV_UP:
2096                 dn_dev_up(dev);
2097                 break;
2098         case NETDEV_DOWN:
2099                 dn_dev_down(dev);
2100                 break;
2101         default:
2102                 break;
2103         }
2104
2105         return NOTIFY_DONE;
2106 }
2107
2108 static struct notifier_block dn_dev_notifier = {
2109         .notifier_call = dn_device_event,
2110 };
2111
2112 static struct packet_type dn_dix_packet_type __read_mostly = {
2113         .type =         cpu_to_be16(ETH_P_DNA_RT),
2114         .func =         dn_route_rcv,
2115 };
2116
2117 #ifdef CONFIG_PROC_FS
2118 struct dn_iter_state {
2119         int bucket;
2120 };
2121
2122 static struct sock *dn_socket_get_first(struct seq_file *seq)
2123 {
2124         struct dn_iter_state *state = seq->private;
2125         struct sock *n = NULL;
2126
2127         for(state->bucket = 0;
2128             state->bucket < DN_SK_HASH_SIZE;
2129             ++state->bucket) {
2130                 n = sk_head(&dn_sk_hash[state->bucket]);
2131                 if (n)
2132                         break;
2133         }
2134
2135         return n;
2136 }
2137
2138 static struct sock *dn_socket_get_next(struct seq_file *seq,
2139                                        struct sock *n)
2140 {
2141         struct dn_iter_state *state = seq->private;
2142
2143         n = sk_next(n);
2144 try_again:
2145         if (n)
2146                 goto out;
2147         if (++state->bucket >= DN_SK_HASH_SIZE)
2148                 goto out;
2149         n = sk_head(&dn_sk_hash[state->bucket]);
2150         goto try_again;
2151 out:
2152         return n;
2153 }
2154
2155 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2156 {
2157         struct sock *sk = dn_socket_get_first(seq);
2158
2159         if (sk) {
2160                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2161                         --*pos;
2162         }
2163         return *pos ? NULL : sk;
2164 }
2165
2166 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2167 {
2168         void *rc;
2169         read_lock_bh(&dn_hash_lock);
2170         rc = socket_get_idx(seq, &pos);
2171         if (!rc) {
2172                 read_unlock_bh(&dn_hash_lock);
2173         }
2174         return rc;
2175 }
2176
2177 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2178 {
2179         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2180 }
2181
2182 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2183 {
2184         void *rc;
2185
2186         if (v == SEQ_START_TOKEN) {
2187                 rc = dn_socket_get_idx(seq, 0);
2188                 goto out;
2189         }
2190
2191         rc = dn_socket_get_next(seq, v);
2192         if (rc)
2193                 goto out;
2194         read_unlock_bh(&dn_hash_lock);
2195 out:
2196         ++*pos;
2197         return rc;
2198 }
2199
2200 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2201 {
2202         if (v && v != SEQ_START_TOKEN)
2203                 read_unlock_bh(&dn_hash_lock);
2204 }
2205
2206 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2207
2208 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2209 {
2210         int i;
2211
2212         switch (le16_to_cpu(dn->sdn_objnamel)) {
2213         case 0:
2214                 sprintf(buf, "%d", dn->sdn_objnum);
2215                 break;
2216         default:
2217                 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2218                         buf[i] = dn->sdn_objname[i];
2219                         if (IS_NOT_PRINTABLE(buf[i]))
2220                                 buf[i] = '.';
2221                 }
2222                 buf[i] = 0;
2223         }
2224 }
2225
2226 static char *dn_state2asc(unsigned char state)
2227 {
2228         switch (state) {
2229         case DN_O:
2230                 return "OPEN";
2231         case DN_CR:
2232                 return "  CR";
2233         case DN_DR:
2234                 return "  DR";
2235         case DN_DRC:
2236                 return " DRC";
2237         case DN_CC:
2238                 return "  CC";
2239         case DN_CI:
2240                 return "  CI";
2241         case DN_NR:
2242                 return "  NR";
2243         case DN_NC:
2244                 return "  NC";
2245         case DN_CD:
2246                 return "  CD";
2247         case DN_RJ:
2248                 return "  RJ";
2249         case DN_RUN:
2250                 return " RUN";
2251         case DN_DI:
2252                 return "  DI";
2253         case DN_DIC:
2254                 return " DIC";
2255         case DN_DN:
2256                 return "  DN";
2257         case DN_CL:
2258                 return "  CL";
2259         case DN_CN:
2260                 return "  CN";
2261         }
2262
2263         return "????";
2264 }
2265
2266 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2267 {
2268         struct dn_scp *scp = DN_SK(sk);
2269         char buf1[DN_ASCBUF_LEN];
2270         char buf2[DN_ASCBUF_LEN];
2271         char local_object[DN_MAXOBJL+3];
2272         char remote_object[DN_MAXOBJL+3];
2273
2274         dn_printable_object(&scp->addr, local_object);
2275         dn_printable_object(&scp->peer, remote_object);
2276
2277         seq_printf(seq,
2278                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2279                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2280                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2281                    scp->addrloc,
2282                    scp->numdat,
2283                    scp->numoth,
2284                    scp->ackxmt_dat,
2285                    scp->ackxmt_oth,
2286                    scp->flowloc_sw,
2287                    local_object,
2288                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2289                    scp->addrrem,
2290                    scp->numdat_rcv,
2291                    scp->numoth_rcv,
2292                    scp->ackrcv_dat,
2293                    scp->ackrcv_oth,
2294                    scp->flowrem_sw,
2295                    remote_object,
2296                    dn_state2asc(scp->state),
2297                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2298 }
2299
2300 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2301 {
2302         if (v == SEQ_START_TOKEN) {
2303                 seq_puts(seq, "Local                                              Remote\n");
2304         } else {
2305                 dn_socket_format_entry(seq, v);
2306         }
2307         return 0;
2308 }
2309
2310 static const struct seq_operations dn_socket_seq_ops = {
2311         .start  = dn_socket_seq_start,
2312         .next   = dn_socket_seq_next,
2313         .stop   = dn_socket_seq_stop,
2314         .show   = dn_socket_seq_show,
2315 };
2316
2317 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2318 {
2319         return seq_open_private(file, &dn_socket_seq_ops,
2320                         sizeof(struct dn_iter_state));
2321 }
2322
2323 static const struct file_operations dn_socket_seq_fops = {
2324         .owner          = THIS_MODULE,
2325         .open           = dn_socket_seq_open,
2326         .read           = seq_read,
2327         .llseek         = seq_lseek,
2328         .release        = seq_release_private,
2329 };
2330 #endif
2331
2332 static const struct net_proto_family    dn_family_ops = {
2333         .family =       AF_DECnet,
2334         .create =       dn_create,
2335         .owner  =       THIS_MODULE,
2336 };
2337
2338 static const struct proto_ops dn_proto_ops = {
2339         .family =       AF_DECnet,
2340         .owner =        THIS_MODULE,
2341         .release =      dn_release,
2342         .bind =         dn_bind,
2343         .connect =      dn_connect,
2344         .socketpair =   sock_no_socketpair,
2345         .accept =       dn_accept,
2346         .getname =      dn_getname,
2347         .poll =         dn_poll,
2348         .ioctl =        dn_ioctl,
2349         .listen =       dn_listen,
2350         .shutdown =     dn_shutdown,
2351         .setsockopt =   dn_setsockopt,
2352         .getsockopt =   dn_getsockopt,
2353         .sendmsg =      dn_sendmsg,
2354         .recvmsg =      dn_recvmsg,
2355         .mmap =         sock_no_mmap,
2356         .sendpage =     sock_no_sendpage,
2357 };
2358
2359 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2360 MODULE_AUTHOR("Linux DECnet Project Team");
2361 MODULE_LICENSE("GPL");
2362 MODULE_ALIAS_NETPROTO(PF_DECnet);
2363
2364 static const char banner[] __initconst = KERN_INFO
2365 "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2366
2367 static int __init decnet_init(void)
2368 {
2369         int rc;
2370
2371         printk(banner);
2372
2373         rc = proto_register(&dn_proto, 1);
2374         if (rc != 0)
2375                 goto out;
2376
2377         dn_neigh_init();
2378         dn_dev_init();
2379         dn_route_init();
2380         dn_fib_init();
2381
2382         sock_register(&dn_family_ops);
2383         dev_add_pack(&dn_dix_packet_type);
2384         register_netdevice_notifier(&dn_dev_notifier);
2385
2386         proc_create("decnet", S_IRUGO, init_net.proc_net, &dn_socket_seq_fops);
2387         dn_register_sysctl();
2388 out:
2389         return rc;
2390
2391 }
2392 module_init(decnet_init);
2393
2394 /*
2395  * Prevent DECnet module unloading until its fixed properly.
2396  * Requires an audit of the code to check for memory leaks and
2397  * initialisation problems etc.
2398  */
2399 #if 0
2400 static void __exit decnet_exit(void)
2401 {
2402         sock_unregister(AF_DECnet);
2403         rtnl_unregister_all(PF_DECnet);
2404         dev_remove_pack(&dn_dix_packet_type);
2405
2406         dn_unregister_sysctl();
2407
2408         unregister_netdevice_notifier(&dn_dev_notifier);
2409
2410         dn_route_cleanup();
2411         dn_dev_cleanup();
2412         dn_neigh_cleanup();
2413         dn_fib_cleanup();
2414
2415         remove_proc_entry("decnet", init_net.proc_net);
2416
2417         proto_unregister(&dn_proto);
2418
2419         rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2420 }
2421 module_exit(decnet_exit);
2422 #endif