git.oblomov.eu Git - linux-2.6/blob - 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.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/system.h>
 123 #include <asm/ioctls.h>
 124 #include <linux/capability.h>
 125 #include <linux/mm.h>
 126 #include <linux/interrupt.h>
 127 #include <linux/proc_fs.h>
 128 #include <linux/stat.h>
 129 #include <linux/init.h>
 130 #include <linux/poll.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/dn.h>
 136 #include <net/dn_nsp.h>
 137 #include <net/dn_dev.h>
 138 #include <net/dn_route.h>
 139 #include <net/dn_fib.h>
 140 #include <net/dn_neigh.h>
 141
 142 struct dn_sock {
 143         struct sock sk;
 144         struct dn_scp scp;
 145 };
 146
 147 static void dn_keepalive(struct sock *sk);
 148
 149 #define DN_SK_HASH_SHIFT 8
 150 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
 151 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
 152
 153
 154 static const struct proto_ops dn_proto_ops;
 155 static DEFINE_RWLOCK(dn_hash_lock);
 156 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 157 static struct hlist_head dn_wild_sk;
 158 static atomic_t decnet_memory_allocated;
 159
 160 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
 161 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 162
 163 static struct hlist_head *dn_find_list(struct sock *sk)
 164 {
 165         struct dn_scp *scp = DN_SK(sk);
 166
 167         if (scp->addr.sdn_flags & SDF_WILD)
 168                 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
 169
 170         return &dn_sk_hash[dn_ntohs(scp->addrloc) & DN_SK_HASH_MASK];
 171 }
 172
 173 /*
 174  * Valid ports are those greater than zero and not already in use.
 175  */
 176 static int check_port(__le16 port)
 177 {
 178         struct sock *sk;
 179         struct hlist_node *node;
 180
 181         if (port == 0)
 182                 return -1;
 183
 184         sk_for_each(sk, node, &dn_sk_hash[dn_ntohs(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(dn_htons(++port)) != 0) {
 199                 if (port == i_port)
 200                         return 0;
 201         }
 202
 203         scp->addrloc = dn_htons(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 hash = addr->sdn_objnum;
 255
 256         if (hash == 0) {
 257                 hash = addr->sdn_objnamel;
 258                 for(i = 0; i < dn_ntohs(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++ = dn_ntohs(sdn->sdn_objnamel);
 301                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
 302                         len = 3 + dn_ntohs(sdn->sdn_objnamel);
 303                         break;
 304                 case 2:
 305                         memset(buf, 0, 5);
 306                         buf += 5;
 307                         *buf++ = dn_ntohs(sdn->sdn_objnamel);
 308                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
 309                         len = 7 + dn_ntohs(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 = dn_htons(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 = dn_htons(*data++);
 365         len -= dn_ntohs(sdn->sdn_objnamel);
 366
 367         if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
 368                 return -1;
 369
 370         memcpy(sdn->sdn_objname, data, dn_ntohs(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 hlist_node *node;
 379         struct sock *sk;
 380
 381         read_lock(&dn_hash_lock);
 382         sk_for_each(sk, node, list) {
 383                 struct dn_scp *scp = DN_SK(sk);
 384                 if (sk->sk_state != TCP_LISTEN)
 385                         continue;
 386                 if (scp->addr.sdn_objnum) {
 387                         if (scp->addr.sdn_objnum != addr->sdn_objnum)
 388                                 continue;
 389                 } else {
 390                         if (addr->sdn_objnum)
 391                                 continue;
 392                         if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 393                                 continue;
 394                         if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
 395                                 continue;
 396                 }
 397                 sock_hold(sk);
 398                 read_unlock(&dn_hash_lock);
 399                 return sk;
 400         }
 401
 402         sk = sk_head(&dn_wild_sk);
 403         if (sk) {
 404                 if (sk->sk_state == TCP_LISTEN)
 405                         sock_hold(sk);
 406                 else
 407                         sk = NULL;
 408         }
 409
 410         read_unlock(&dn_hash_lock);
 411         return sk;
 412 }
 413
 414 struct sock *dn_find_by_skb(struct sk_buff *skb)
 415 {
 416         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 417         struct sock *sk;
 418         struct hlist_node *node;
 419         struct dn_scp *scp;
 420
 421         read_lock(&dn_hash_lock);
 422         sk_for_each(sk, node, &dn_sk_hash[dn_ntohs(cb->dst_port) & DN_SK_HASH_MASK]) {
 423                 scp = DN_SK(sk);
 424                 if (cb->src != dn_saddr2dn(&scp->peer))
 425                         continue;
 426                 if (cb->dst_port != scp->addrloc)
 427                         continue;
 428                 if (scp->addrrem && (cb->src_port != scp->addrrem))
 429                         continue;
 430                 sock_hold(sk);
 431                 goto found;
 432         }
 433         sk = NULL;
 434 found:
 435         read_unlock(&dn_hash_lock);
 436         return sk;
 437 }
 438
 439
 440
 441 static void dn_destruct(struct sock *sk)
 442 {
 443         struct dn_scp *scp = DN_SK(sk);
 444
 445         skb_queue_purge(&scp->data_xmit_queue);
 446         skb_queue_purge(&scp->other_xmit_queue);
 447         skb_queue_purge(&scp->other_receive_queue);
 448
 449         dst_release(xchg(&sk->sk_dst_cache, NULL));
 450 }
 451
 452 static int dn_memory_pressure;
 453
 454 static void dn_enter_memory_pressure(void)
 455 {
 456         if (!dn_memory_pressure) {
 457                 dn_memory_pressure = 1;
 458         }
 459 }
 460
 461 static struct proto dn_proto = {
 462         .name                   = "NSP",
 463         .owner                  = THIS_MODULE,
 464         .enter_memory_pressure  = dn_enter_memory_pressure,
 465         .memory_pressure        = &dn_memory_pressure,
 466         .memory_allocated       = &decnet_memory_allocated,
 467         .sysctl_mem             = sysctl_decnet_mem,
 468         .sysctl_wmem            = sysctl_decnet_wmem,
 469         .sysctl_rmem            = sysctl_decnet_rmem,
 470         .max_header             = DN_MAX_NSP_DATA_HEADER + 64,
 471         .obj_size               = sizeof(struct dn_sock),
 472 };
 473
 474 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
 475 {
 476         struct dn_scp *scp;
 477         struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
 478
 479         if  (!sk)
 480                 goto out;
 481
 482         if (sock)
 483                 sock->ops = &dn_proto_ops;
 484         sock_init_data(sock, sk);
 485
 486         sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 487         sk->sk_destruct    = dn_destruct;
 488         sk->sk_no_check    = 1;
 489         sk->sk_family      = PF_DECnet;
 490         sk->sk_protocol    = 0;
 491         sk->sk_allocation  = gfp;
 492         sk->sk_sndbuf      = sysctl_decnet_wmem[1];
 493         sk->sk_rcvbuf      = sysctl_decnet_rmem[1];
 494
 495         /* Initialization of DECnet Session Control Port                */
 496         scp = DN_SK(sk);
 497         scp->state      = DN_O;         /* Open                 */
 498         scp->numdat     = 1;            /* Next data seg to tx  */
 499         scp->numoth     = 1;            /* Next oth data to tx  */
 500         scp->ackxmt_dat = 0;            /* Last data seg ack'ed */
 501         scp->ackxmt_oth = 0;            /* Last oth data ack'ed */
 502         scp->ackrcv_dat = 0;            /* Highest data ack recv*/
 503         scp->ackrcv_oth = 0;            /* Last oth data ack rec*/
 504         scp->flowrem_sw = DN_SEND;
 505         scp->flowloc_sw = DN_SEND;
 506         scp->flowrem_dat = 0;
 507         scp->flowrem_oth = 1;
 508         scp->flowloc_dat = 0;
 509         scp->flowloc_oth = 1;
 510         scp->services_rem = 0;
 511         scp->services_loc = 1 | NSP_FC_NONE;
 512         scp->info_rem = 0;
 513         scp->info_loc = 0x03; /* NSP version 4.1 */
 514         scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 515         scp->nonagle = 0;
 516         scp->multi_ireq = 1;
 517         scp->accept_mode = ACC_IMMED;
 518         scp->addr.sdn_family    = AF_DECnet;
 519         scp->peer.sdn_family    = AF_DECnet;
 520         scp->accessdata.acc_accl = 5;
 521         memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 522
 523         scp->max_window   = NSP_MAX_WINDOW;
 524         scp->snd_window   = NSP_MIN_WINDOW;
 525         scp->nsp_srtt     = NSP_INITIAL_SRTT;
 526         scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 527         scp->nsp_rxtshift = 0;
 528
 529         skb_queue_head_init(&scp->data_xmit_queue);
 530         skb_queue_head_init(&scp->other_xmit_queue);
 531         skb_queue_head_init(&scp->other_receive_queue);
 532
 533         scp->persist = 0;
 534         scp->persist_fxn = NULL;
 535         scp->keepalive = 10 * HZ;
 536         scp->keepalive_fxn = dn_keepalive;
 537
 538         init_timer(&scp->delack_timer);
 539         scp->delack_pending = 0;
 540         scp->delack_fxn = dn_nsp_delayed_ack;
 541
 542         dn_start_slow_timer(sk);
 543 out:
 544         return sk;
 545 }
 546
 547 /*
 548  * Keepalive timer.
 549  * FIXME: Should respond to SO_KEEPALIVE etc.
 550  */
 551 static void dn_keepalive(struct sock *sk)
 552 {
 553         struct dn_scp *scp = DN_SK(sk);
 554
 555         /*
 556          * By checking the other_data transmit queue is empty
 557          * we are double checking that we are not sending too
 558          * many of these keepalive frames.
 559          */
 560         if (skb_queue_empty(&scp->other_xmit_queue))
 561                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 562 }
 563
 564
 565 /*
 566  * Timer for shutdown/destroyed sockets.
 567  * When socket is dead & no packets have been sent for a
 568  * certain amount of time, they are removed by this
 569  * routine. Also takes care of sending out DI & DC
 570  * frames at correct times.
 571  */
 572 int dn_destroy_timer(struct sock *sk)
 573 {
 574         struct dn_scp *scp = DN_SK(sk);
 575
 576         scp->persist = dn_nsp_persist(sk);
 577
 578         switch(scp->state) {
 579                 case DN_DI:
 580                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 581                         if (scp->nsp_rxtshift >= decnet_di_count)
 582                                 scp->state = DN_CN;
 583                         return 0;
 584
 585                 case DN_DR:
 586                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 587                         if (scp->nsp_rxtshift >= decnet_dr_count)
 588                                 scp->state = DN_DRC;
 589                         return 0;
 590
 591                 case DN_DN:
 592                         if (scp->nsp_rxtshift < decnet_dn_count) {
 593                                 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 594                                 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
 595                                 return 0;
 596                         }
 597         }
 598
 599         scp->persist = (HZ * decnet_time_wait);
 600
 601         if (sk->sk_socket)
 602                 return 0;
 603
 604         if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
 605                 dn_unhash_sock(sk);
 606                 sock_put(sk);
 607                 return 1;
 608         }
 609
 610         return 0;
 611 }
 612
 613 static void dn_destroy_sock(struct sock *sk)
 614 {
 615         struct dn_scp *scp = DN_SK(sk);
 616
 617         scp->nsp_rxtshift = 0; /* reset back off */
 618
 619         if (sk->sk_socket) {
 620                 if (sk->sk_socket->state != SS_UNCONNECTED)
 621                         sk->sk_socket->state = SS_DISCONNECTING;
 622         }
 623
 624         sk->sk_state = TCP_CLOSE;
 625
 626         switch(scp->state) {
 627                 case DN_DN:
 628                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 629                                          sk->sk_allocation);
 630                         scp->persist_fxn = dn_destroy_timer;
 631                         scp->persist = dn_nsp_persist(sk);
 632                         break;
 633                 case DN_CR:
 634                         scp->state = DN_DR;
 635                         goto disc_reject;
 636                 case DN_RUN:
 637                         scp->state = DN_DI;
 638                 case DN_DI:
 639                 case DN_DR:
 640 disc_reject:
 641                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 642                 case DN_NC:
 643                 case DN_NR:
 644                 case DN_RJ:
 645                 case DN_DIC:
 646                 case DN_CN:
 647                 case DN_DRC:
 648                 case DN_CI:
 649                 case DN_CD:
 650                         scp->persist_fxn = dn_destroy_timer;
 651                         scp->persist = dn_nsp_persist(sk);
 652                         break;
 653                 default:
 654                         printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 655                 case DN_O:
 656                         dn_stop_slow_timer(sk);
 657
 658                         dn_unhash_sock_bh(sk);
 659                         sock_put(sk);
 660
 661                         break;
 662         }
 663 }
 664
 665 char *dn_addr2asc(__u16 addr, char *buf)
 666 {
 667         unsigned short node, area;
 668
 669         node = addr & 0x03ff;
 670         area = addr >> 10;
 671         sprintf(buf, "%hd.%hd", area, node);
 672
 673         return buf;
 674 }
 675
 676
 677
 678 static int dn_create(struct net *net, struct socket *sock, int protocol)
 679 {
 680         struct sock *sk;
 681
 682         if (net != &init_net)
 683                 return -EAFNOSUPPORT;
 684
 685         switch(sock->type) {
 686                 case SOCK_SEQPACKET:
 687                         if (protocol != DNPROTO_NSP)
 688                                 return -EPROTONOSUPPORT;
 689                         break;
 690                 case SOCK_STREAM:
 691                         break;
 692                 default:
 693                         return -ESOCKTNOSUPPORT;
 694         }
 695
 696
 697         if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
 698                 return -ENOBUFS;
 699
 700         sk->sk_protocol = protocol;
 701
 702         return 0;
 703 }
 704
 705
 706 static int
 707 dn_release(struct socket *sock)
 708 {
 709         struct sock *sk = sock->sk;
 710
 711         if (sk) {
 712                 sock_orphan(sk);
 713                 sock_hold(sk);
 714                 lock_sock(sk);
 715                 dn_destroy_sock(sk);
 716                 release_sock(sk);
 717                 sock_put(sk);
 718         }
 719
 720         return 0;
 721 }
 722
 723 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 724 {
 725         struct sock *sk = sock->sk;
 726         struct dn_scp *scp = DN_SK(sk);
 727         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 728         struct net_device *dev, *ldev;
 729         int rv;
 730
 731         if (addr_len != sizeof(struct sockaddr_dn))
 732                 return -EINVAL;
 733
 734         if (saddr->sdn_family != AF_DECnet)
 735                 return -EINVAL;
 736
 737         if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
 738                 return -EINVAL;
 739
 740         if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
 741                 return -EINVAL;
 742
 743         if (saddr->sdn_flags & ~SDF_WILD)
 744                 return -EINVAL;
 745
 746         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 747             (saddr->sdn_flags & SDF_WILD)))
 748                 return -EACCES;
 749
 750         if (!(saddr->sdn_flags & SDF_WILD)) {
 751                 if (dn_ntohs(saddr->sdn_nodeaddrl)) {
 752                         read_lock(&dev_base_lock);
 753                         ldev = NULL;
 754                         for_each_netdev(&init_net, dev) {
 755                                 if (!dev->dn_ptr)
 756                                         continue;
 757                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 758                                         ldev = dev;
 759                                         break;
 760                                 }
 761                         }
 762                         read_unlock(&dev_base_lock);
 763                         if (ldev == NULL)
 764                                 return -EADDRNOTAVAIL;
 765                 }
 766         }
 767
 768         rv = -EINVAL;
 769         lock_sock(sk);
 770         if (sock_flag(sk, SOCK_ZAPPED)) {
 771                 memcpy(&scp->addr, saddr, addr_len);
 772                 sock_reset_flag(sk, SOCK_ZAPPED);
 773
 774                 rv = dn_hash_sock(sk);
 775                 if (rv)
 776                         sock_set_flag(sk, SOCK_ZAPPED);
 777         }
 778         release_sock(sk);
 779
 780         return rv;
 781 }
 782
 783
 784 static int dn_auto_bind(struct socket *sock)
 785 {
 786         struct sock *sk = sock->sk;
 787         struct dn_scp *scp = DN_SK(sk);
 788         int rv;
 789
 790         sock_reset_flag(sk, SOCK_ZAPPED);
 791
 792         scp->addr.sdn_flags  = 0;
 793         scp->addr.sdn_objnum = 0;
 794
 795         /*
 796          * This stuff is to keep compatibility with Eduardo's
 797          * patch. I hope I can dispense with it shortly...
 798          */
 799         if ((scp->accessdata.acc_accl != 0) &&
 800                 (scp->accessdata.acc_accl <= 12)) {
 801
 802                 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
 803                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
 804
 805                 scp->accessdata.acc_accl = 0;
 806                 memset(scp->accessdata.acc_acc, 0, 40);
 807         }
 808         /* End of compatibility stuff */
 809
 810         scp->addr.sdn_add.a_len = dn_htons(2);
 811         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 812         if (rv == 0) {
 813                 rv = dn_hash_sock(sk);
 814                 if (rv)
 815                         sock_set_flag(sk, SOCK_ZAPPED);
 816         }
 817
 818         return rv;
 819 }
 820
 821 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 822 {
 823         struct dn_scp *scp = DN_SK(sk);
 824         DEFINE_WAIT(wait);
 825         int err;
 826
 827         if (scp->state != DN_CR)
 828                 return -EINVAL;
 829
 830         scp->state = DN_CC;
 831         scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
 832         dn_send_conn_conf(sk, allocation);
 833
 834         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 835         for(;;) {
 836                 release_sock(sk);
 837                 if (scp->state == DN_CC)
 838                         *timeo = schedule_timeout(*timeo);
 839                 lock_sock(sk);
 840                 err = 0;
 841                 if (scp->state == DN_RUN)
 842                         break;
 843                 err = sock_error(sk);
 844                 if (err)
 845                         break;
 846                 err = sock_intr_errno(*timeo);
 847                 if (signal_pending(current))
 848                         break;
 849                 err = -EAGAIN;
 850                 if (!*timeo)
 851                         break;
 852                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 853         }
 854         finish_wait(sk->sk_sleep, &wait);
 855         if (err == 0) {
 856                 sk->sk_socket->state = SS_CONNECTED;
 857         } else if (scp->state != DN_CC) {
 858                 sk->sk_socket->state = SS_UNCONNECTED;
 859         }
 860         return err;
 861 }
 862
 863 static int dn_wait_run(struct sock *sk, long *timeo)
 864 {
 865         struct dn_scp *scp = DN_SK(sk);
 866         DEFINE_WAIT(wait);
 867         int err = 0;
 868
 869         if (scp->state == DN_RUN)
 870                 goto out;
 871
 872         if (!*timeo)
 873                 return -EALREADY;
 874
 875         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 876         for(;;) {
 877                 release_sock(sk);
 878                 if (scp->state == DN_CI || scp->state == DN_CC)
 879                         *timeo = schedule_timeout(*timeo);
 880                 lock_sock(sk);
 881                 err = 0;
 882                 if (scp->state == DN_RUN)
 883                         break;
 884                 err = sock_error(sk);
 885                 if (err)
 886                         break;
 887                 err = sock_intr_errno(*timeo);
 888                 if (signal_pending(current))
 889                         break;
 890                 err = -ETIMEDOUT;
 891                 if (!*timeo)
 892                         break;
 893                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 894         }
 895         finish_wait(sk->sk_sleep, &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 flowi fl;
 911
 912         if (sock->state == SS_CONNECTED)
 913                 goto out;
 914
 915         if (sock->state == SS_CONNECTING) {
 916                 err = 0;
 917                 if (scp->state == DN_RUN) {
 918                         sock->state = SS_CONNECTED;
 919                         goto out;
 920                 }
 921                 err = -ECONNREFUSED;
 922                 if (scp->state != DN_CI && scp->state != DN_CC) {
 923                         sock->state = SS_UNCONNECTED;
 924                         goto out;
 925                 }
 926                 return dn_wait_run(sk, timeo);
 927         }
 928
 929         err = -EINVAL;
 930         if (scp->state != DN_O)
 931                 goto out;
 932
 933         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 934                 goto out;
 935         if (addr->sdn_family != AF_DECnet)
 936                 goto out;
 937         if (addr->sdn_flags & SDF_WILD)
 938                 goto out;
 939
 940         if (sock_flag(sk, SOCK_ZAPPED)) {
 941                 err = dn_auto_bind(sk->sk_socket);
 942                 if (err)
 943                         goto out;
 944         }
 945
 946         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 947
 948         err = -EHOSTUNREACH;
 949         memset(&fl, 0, sizeof(fl));
 950         fl.oif = sk->sk_bound_dev_if;
 951         fl.fld_dst = dn_saddr2dn(&scp->peer);
 952         fl.fld_src = dn_saddr2dn(&scp->addr);
 953         dn_sk_ports_copy(&fl, scp);
 954         fl.proto = DNPROTO_NSP;
 955         if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
 956                 goto out;
 957         sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 958         sock->state = SS_CONNECTING;
 959         scp->state = DN_CI;
 960         scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
 961
 962         dn_nsp_send_conninit(sk, NSP_CI);
 963         err = -EINPROGRESS;
 964         if (*timeo) {
 965                 err = dn_wait_run(sk, timeo);
 966         }
 967 out:
 968         return err;
 969 }
 970
 971 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 972 {
 973         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 974         struct sock *sk = sock->sk;
 975         int err;
 976         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 977
 978         lock_sock(sk);
 979         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 980         release_sock(sk);
 981
 982         return err;
 983 }
 984
 985 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 986 {
 987         struct dn_scp *scp = DN_SK(sk);
 988
 989         switch(scp->state) {
 990                 case DN_RUN:
 991                         return 0;
 992                 case DN_CR:
 993                         return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 994                 case DN_CI:
 995                 case DN_CC:
 996                         return dn_wait_run(sk, timeo);
 997                 case DN_O:
 998                         return __dn_connect(sk, addr, addrlen, timeo, flags);
 999         }
1000
1001         return -EINVAL;
1002 }
1003
1004
1005 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1006 {
1007         unsigned char *ptr = skb->data;
1008
1009         acc->acc_userl = *ptr++;
1010         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1011         ptr += acc->acc_userl;
1012
1013         acc->acc_passl = *ptr++;
1014         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1015         ptr += acc->acc_passl;
1016
1017         acc->acc_accl = *ptr++;
1018         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1019
1020         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1021
1022 }
1023
1024 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1025 {
1026         unsigned char *ptr = skb->data;
1027         u16 len = *ptr++; /* yes, it's 8bit on the wire */
1028
1029         BUG_ON(len > 16); /* we've checked the contents earlier */
1030         opt->opt_optl   = dn_htons(len);
1031         opt->opt_status = 0;
1032         memcpy(opt->opt_data, ptr, len);
1033         skb_pull(skb, len + 1);
1034 }
1035
1036 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1037 {
1038         DEFINE_WAIT(wait);
1039         struct sk_buff *skb = NULL;
1040         int err = 0;
1041
1042         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1043         for(;;) {
1044                 release_sock(sk);
1045                 skb = skb_dequeue(&sk->sk_receive_queue);
1046                 if (skb == NULL) {
1047                         *timeo = schedule_timeout(*timeo);
1048                         skb = skb_dequeue(&sk->sk_receive_queue);
1049                 }
1050                 lock_sock(sk);
1051                 if (skb != NULL)
1052                         break;
1053                 err = -EINVAL;
1054                 if (sk->sk_state != TCP_LISTEN)
1055                         break;
1056                 err = sock_intr_errno(*timeo);
1057                 if (signal_pending(current))
1058                         break;
1059                 err = -EAGAIN;
1060                 if (!*timeo)
1061                         break;
1062                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1063         }
1064         finish_wait(sk->sk_sleep, &wait);
1065
1066         return skb == NULL ? ERR_PTR(err) : skb;
1067 }
1068
1069 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1070 {
1071         struct sock *sk = sock->sk, *newsk;
1072         struct sk_buff *skb = NULL;
1073         struct dn_skb_cb *cb;
1074         unsigned char menuver;
1075         int err = 0;
1076         unsigned char type;
1077         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1078
1079         lock_sock(sk);
1080
1081         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1082                 release_sock(sk);
1083                 return -EINVAL;
1084         }
1085
1086         skb = skb_dequeue(&sk->sk_receive_queue);
1087         if (skb == NULL) {
1088                 skb = dn_wait_for_connect(sk, &timeo);
1089                 if (IS_ERR(skb)) {
1090                         release_sock(sk);
1091                         return PTR_ERR(skb);
1092                 }
1093         }
1094
1095         cb = DN_SKB_CB(skb);
1096         sk->sk_ack_backlog--;
1097         newsk = dn_alloc_sock(sk->sk_net, newsock, sk->sk_allocation);
1098         if (newsk == NULL) {
1099                 release_sock(sk);
1100                 kfree_skb(skb);
1101                 return -ENOBUFS;
1102         }
1103         release_sock(sk);
1104
1105         dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1106         skb->dst = NULL;
1107
1108         DN_SK(newsk)->state        = DN_CR;
1109         DN_SK(newsk)->addrrem      = cb->src_port;
1110         DN_SK(newsk)->services_rem = cb->services;
1111         DN_SK(newsk)->info_rem     = cb->info;
1112         DN_SK(newsk)->segsize_rem  = cb->segsize;
1113         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1114
1115         if (DN_SK(newsk)->segsize_rem < 230)
1116                 DN_SK(newsk)->segsize_rem = 230;
1117
1118         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1119                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1120
1121         newsk->sk_state  = TCP_LISTEN;
1122         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1123
1124         /*
1125          * If we are listening on a wild socket, we don't want
1126          * the newly created socket on the wrong hash queue.
1127          */
1128         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1129
1130         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1131         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1132         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1133         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1134
1135         menuver = *skb->data;
1136         skb_pull(skb, 1);
1137
1138         if (menuver & DN_MENUVER_ACC)
1139                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1140
1141         if (menuver & DN_MENUVER_USR)
1142                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1143
1144         if (menuver & DN_MENUVER_PRX)
1145                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1146
1147         if (menuver & DN_MENUVER_UIC)
1148                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1149
1150         kfree_skb(skb);
1151
1152         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1153                 sizeof(struct optdata_dn));
1154         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1155                 sizeof(struct optdata_dn));
1156
1157         lock_sock(newsk);
1158         err = dn_hash_sock(newsk);
1159         if (err == 0) {
1160                 sock_reset_flag(newsk, SOCK_ZAPPED);
1161                 dn_send_conn_ack(newsk);
1162
1163                 /*
1164                  * Here we use sk->sk_allocation since although the conn conf is
1165                  * for the newsk, the context is the old socket.
1166                  */
1167                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1168                         err = dn_confirm_accept(newsk, &timeo,
1169                                                 sk->sk_allocation);
1170         }
1171         release_sock(newsk);
1172         return err;
1173 }
1174
1175
1176 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1177 {
1178         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1179         struct sock *sk = sock->sk;
1180         struct dn_scp *scp = DN_SK(sk);
1181
1182         *uaddr_len = sizeof(struct sockaddr_dn);
1183
1184         lock_sock(sk);
1185
1186         if (peer) {
1187                 if ((sock->state != SS_CONNECTED &&
1188                      sock->state != SS_CONNECTING) &&
1189                     scp->accept_mode == ACC_IMMED) {
1190                         release_sock(sk);
1191                         return -ENOTCONN;
1192                 }
1193
1194                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1195         } else {
1196                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1197         }
1198
1199         release_sock(sk);
1200
1201         return 0;
1202 }
1203
1204
1205 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1206 {
1207         struct sock *sk = sock->sk;
1208         struct dn_scp *scp = DN_SK(sk);
1209         int mask = datagram_poll(file, sock, wait);
1210
1211         if (!skb_queue_empty(&scp->other_receive_queue))
1212                 mask |= POLLRDBAND;
1213
1214         return mask;
1215 }
1216
1217 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1218 {
1219         struct sock *sk = sock->sk;
1220         struct dn_scp *scp = DN_SK(sk);
1221         int err = -EOPNOTSUPP;
1222         long amount = 0;
1223         struct sk_buff *skb;
1224         int val;
1225
1226         switch(cmd)
1227         {
1228         case SIOCGIFADDR:
1229         case SIOCSIFADDR:
1230                 return dn_dev_ioctl(cmd, (void __user *)arg);
1231
1232         case SIOCATMARK:
1233                 lock_sock(sk);
1234                 val = !skb_queue_empty(&scp->other_receive_queue);
1235                 if (scp->state != DN_RUN)
1236                         val = -ENOTCONN;
1237                 release_sock(sk);
1238                 return val;
1239
1240         case TIOCOUTQ:
1241                 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1242                 if (amount < 0)
1243                         amount = 0;
1244                 err = put_user(amount, (int __user *)arg);
1245                 break;
1246
1247         case TIOCINQ:
1248                 lock_sock(sk);
1249                 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1250                         amount = skb->len;
1251                 } else {
1252                         struct sk_buff *skb = sk->sk_receive_queue.next;
1253                         for(;;) {
1254                                 if (skb ==
1255                                     (struct sk_buff *)&sk->sk_receive_queue)
1256                                         break;
1257                                 amount += skb->len;
1258                                 skb = skb->next;
1259                         }
1260                 }
1261                 release_sock(sk);
1262                 err = put_user(amount, (int __user *)arg);
1263                 break;
1264
1265         default:
1266                 err = -ENOIOCTLCMD;
1267                 break;
1268         }
1269
1270         return err;
1271 }
1272
1273 static int dn_listen(struct socket *sock, int backlog)
1274 {
1275         struct sock *sk = sock->sk;
1276         int err = -EINVAL;
1277
1278         lock_sock(sk);
1279
1280         if (sock_flag(sk, SOCK_ZAPPED))
1281                 goto out;
1282
1283         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1284                 goto out;
1285
1286         sk->sk_max_ack_backlog = backlog;
1287         sk->sk_ack_backlog     = 0;
1288         sk->sk_state           = TCP_LISTEN;
1289         err                 = 0;
1290         dn_rehash_sock(sk);
1291
1292 out:
1293         release_sock(sk);
1294
1295         return err;
1296 }
1297
1298
1299 static int dn_shutdown(struct socket *sock, int how)
1300 {
1301         struct sock *sk = sock->sk;
1302         struct dn_scp *scp = DN_SK(sk);
1303         int err = -ENOTCONN;
1304
1305         lock_sock(sk);
1306
1307         if (sock->state == SS_UNCONNECTED)
1308                 goto out;
1309
1310         err = 0;
1311         if (sock->state == SS_DISCONNECTING)
1312                 goto out;
1313
1314         err = -EINVAL;
1315         if (scp->state == DN_O)
1316                 goto out;
1317
1318         if (how != SHUTDOWN_MASK)
1319                 goto out;
1320
1321         sk->sk_shutdown = how;
1322         dn_destroy_sock(sk);
1323         err = 0;
1324
1325 out:
1326         release_sock(sk);
1327
1328         return err;
1329 }
1330
1331 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1332 {
1333         struct sock *sk = sock->sk;
1334         int err;
1335
1336         lock_sock(sk);
1337         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1338         release_sock(sk);
1339
1340         return err;
1341 }
1342
1343 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1344 {
1345         struct  sock *sk = sock->sk;
1346         struct dn_scp *scp = DN_SK(sk);
1347         long timeo;
1348         union {
1349                 struct optdata_dn opt;
1350                 struct accessdata_dn acc;
1351                 int mode;
1352                 unsigned long win;
1353                 int val;
1354                 unsigned char services;
1355                 unsigned char info;
1356         } u;
1357         int err;
1358
1359         if (optlen && !optval)
1360                 return -EINVAL;
1361
1362         if (optlen > sizeof(u))
1363                 return -EINVAL;
1364
1365         if (copy_from_user(&u, optval, optlen))
1366                 return -EFAULT;
1367
1368         switch(optname) {
1369                 case DSO_CONDATA:
1370                         if (sock->state == SS_CONNECTED)
1371                                 return -EISCONN;
1372                         if ((scp->state != DN_O) && (scp->state != DN_CR))
1373                                 return -EINVAL;
1374
1375                         if (optlen != sizeof(struct optdata_dn))
1376                                 return -EINVAL;
1377
1378                         if (dn_ntohs(u.opt.opt_optl) > 16)
1379                                 return -EINVAL;
1380
1381                         memcpy(&scp->conndata_out, &u.opt, optlen);
1382                         break;
1383
1384                 case DSO_DISDATA:
1385                         if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1386                                 return -ENOTCONN;
1387
1388                         if (optlen != sizeof(struct optdata_dn))
1389                                 return -EINVAL;
1390
1391                         if (dn_ntohs(u.opt.opt_optl) > 16)
1392                                 return -EINVAL;
1393
1394                         memcpy(&scp->discdata_out, &u.opt, optlen);
1395                         break;
1396
1397                 case DSO_CONACCESS:
1398                         if (sock->state == SS_CONNECTED)
1399                                 return -EISCONN;
1400                         if (scp->state != DN_O)
1401                                 return -EINVAL;
1402
1403                         if (optlen != sizeof(struct accessdata_dn))
1404                                 return -EINVAL;
1405
1406                         if ((u.acc.acc_accl > DN_MAXACCL) ||
1407                                         (u.acc.acc_passl > DN_MAXACCL) ||
1408                                         (u.acc.acc_userl > DN_MAXACCL))
1409                                 return -EINVAL;
1410
1411                         memcpy(&scp->accessdata, &u.acc, optlen);
1412                         break;
1413
1414                 case DSO_ACCEPTMODE:
1415                         if (sock->state == SS_CONNECTED)
1416                                 return -EISCONN;
1417                         if (scp->state != DN_O)
1418                                 return -EINVAL;
1419
1420                         if (optlen != sizeof(int))
1421                                 return -EINVAL;
1422
1423                         if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1424                                 return -EINVAL;
1425
1426                         scp->accept_mode = (unsigned char)u.mode;
1427                         break;
1428
1429                 case DSO_CONACCEPT:
1430
1431                         if (scp->state != DN_CR)
1432                                 return -EINVAL;
1433                         timeo = sock_rcvtimeo(sk, 0);
1434                         err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1435                         return err;
1436
1437                 case DSO_CONREJECT:
1438
1439                         if (scp->state != DN_CR)
1440                                 return -EINVAL;
1441
1442                         scp->state = DN_DR;
1443                         sk->sk_shutdown = SHUTDOWN_MASK;
1444                         dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1445                         break;
1446
1447                 default:
1448 #ifdef CONFIG_NETFILTER
1449                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1450 #endif
1451                 case DSO_LINKINFO:
1452                 case DSO_STREAM:
1453                 case DSO_SEQPACKET:
1454                         return -ENOPROTOOPT;
1455
1456                 case DSO_MAXWINDOW:
1457                         if (optlen != sizeof(unsigned long))
1458                                 return -EINVAL;
1459                         if (u.win > NSP_MAX_WINDOW)
1460                                 u.win = NSP_MAX_WINDOW;
1461                         if (u.win == 0)
1462                                 return -EINVAL;
1463                         scp->max_window = u.win;
1464                         if (scp->snd_window > u.win)
1465                                 scp->snd_window = u.win;
1466                         break;
1467
1468                 case DSO_NODELAY:
1469                         if (optlen != sizeof(int))
1470                                 return -EINVAL;
1471                         if (scp->nonagle == 2)
1472                                 return -EINVAL;
1473                         scp->nonagle = (u.val == 0) ? 0 : 1;
1474                         /* if (scp->nonagle == 1) { Push pending frames } */
1475                         break;
1476
1477                 case DSO_CORK:
1478                         if (optlen != sizeof(int))
1479                                 return -EINVAL;
1480                         if (scp->nonagle == 1)
1481                                 return -EINVAL;
1482                         scp->nonagle = (u.val == 0) ? 0 : 2;
1483                         /* if (scp->nonagle == 0) { Push pending frames } */
1484                         break;
1485
1486                 case DSO_SERVICES:
1487                         if (optlen != sizeof(unsigned char))
1488                                 return -EINVAL;
1489                         if ((u.services & ~NSP_FC_MASK) != 0x01)
1490                                 return -EINVAL;
1491                         if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1492                                 return -EINVAL;
1493                         scp->services_loc = u.services;
1494                         break;
1495
1496                 case DSO_INFO:
1497                         if (optlen != sizeof(unsigned char))
1498                                 return -EINVAL;
1499                         if (u.info & 0xfc)
1500                                 return -EINVAL;
1501                         scp->info_loc = u.info;
1502                         break;
1503         }
1504
1505         return 0;
1506 }
1507
1508 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1509 {
1510         struct sock *sk = sock->sk;
1511         int err;
1512
1513         lock_sock(sk);
1514         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1515         release_sock(sk);
1516
1517         return err;
1518 }
1519
1520 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1521 {
1522         struct  sock *sk = sock->sk;
1523         struct dn_scp *scp = DN_SK(sk);
1524         struct linkinfo_dn link;
1525         unsigned int r_len;
1526         void *r_data = NULL;
1527         unsigned int val;
1528
1529         if(get_user(r_len , optlen))
1530                 return -EFAULT;
1531
1532         switch(optname) {
1533                 case DSO_CONDATA:
1534                         if (r_len > sizeof(struct optdata_dn))
1535                                 r_len = sizeof(struct optdata_dn);
1536                         r_data = &scp->conndata_in;
1537                         break;
1538
1539                 case DSO_DISDATA:
1540                         if (r_len > sizeof(struct optdata_dn))
1541                                 r_len = sizeof(struct optdata_dn);
1542                         r_data = &scp->discdata_in;
1543                         break;
1544
1545                 case DSO_CONACCESS:
1546                         if (r_len > sizeof(struct accessdata_dn))
1547                                 r_len = sizeof(struct accessdata_dn);
1548                         r_data = &scp->accessdata;
1549                         break;
1550
1551                 case DSO_ACCEPTMODE:
1552                         if (r_len > sizeof(unsigned char))
1553                                 r_len = sizeof(unsigned char);
1554                         r_data = &scp->accept_mode;
1555                         break;
1556
1557                 case DSO_LINKINFO:
1558                         if (r_len > sizeof(struct linkinfo_dn))
1559                                 r_len = sizeof(struct linkinfo_dn);
1560
1561                         switch(sock->state) {
1562                                 case SS_CONNECTING:
1563                                         link.idn_linkstate = LL_CONNECTING;
1564                                         break;
1565                                 case SS_DISCONNECTING:
1566                                         link.idn_linkstate = LL_DISCONNECTING;
1567                                         break;
1568                                 case SS_CONNECTED:
1569                                         link.idn_linkstate = LL_RUNNING;
1570                                         break;
1571                                 default:
1572                                         link.idn_linkstate = LL_INACTIVE;
1573                         }
1574
1575                         link.idn_segsize = scp->segsize_rem;
1576                         r_data = &link;
1577                         break;
1578
1579                 default:
1580 #ifdef CONFIG_NETFILTER
1581                 {
1582                         int val, len;
1583
1584                         if(get_user(len, optlen))
1585                                 return -EFAULT;
1586
1587                         val = nf_getsockopt(sk, PF_DECnet, optname,
1588                                                         optval, &len);
1589                         if (val >= 0)
1590                                 val = put_user(len, optlen);
1591                         return val;
1592                 }
1593 #endif
1594                 case DSO_STREAM:
1595                 case DSO_SEQPACKET:
1596                 case DSO_CONACCEPT:
1597                 case DSO_CONREJECT:
1598                         return -ENOPROTOOPT;
1599
1600                 case DSO_MAXWINDOW:
1601                         if (r_len > sizeof(unsigned long))
1602                                 r_len = sizeof(unsigned long);
1603                         r_data = &scp->max_window;
1604                         break;
1605
1606                 case DSO_NODELAY:
1607                         if (r_len > sizeof(int))
1608                                 r_len = sizeof(int);
1609                         val = (scp->nonagle == 1);
1610                         r_data = &val;
1611                         break;
1612
1613                 case DSO_CORK:
1614                         if (r_len > sizeof(int))
1615                                 r_len = sizeof(int);
1616                         val = (scp->nonagle == 2);
1617                         r_data = &val;
1618                         break;
1619
1620                 case DSO_SERVICES:
1621                         if (r_len > sizeof(unsigned char))
1622                                 r_len = sizeof(unsigned char);
1623                         r_data = &scp->services_rem;
1624                         break;
1625
1626                 case DSO_INFO:
1627                         if (r_len > sizeof(unsigned char))
1628                                 r_len = sizeof(unsigned char);
1629                         r_data = &scp->info_rem;
1630                         break;
1631         }
1632
1633         if (r_data) {
1634                 if (copy_to_user(optval, r_data, r_len))
1635                         return -EFAULT;
1636                 if (put_user(r_len, optlen))
1637                         return -EFAULT;
1638         }
1639
1640         return 0;
1641 }
1642
1643
1644 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1645 {
1646         struct sk_buff *skb = q->next;
1647         int len = 0;
1648
1649         if (flags & MSG_OOB)
1650                 return !skb_queue_empty(q) ? 1 : 0;
1651
1652         while(skb != (struct sk_buff *)q) {
1653                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1654                 len += skb->len;
1655
1656                 if (cb->nsp_flags & 0x40) {
1657                         /* SOCK_SEQPACKET reads to EOM */
1658                         if (sk->sk_type == SOCK_SEQPACKET)
1659                                 return 1;
1660                         /* so does SOCK_STREAM unless WAITALL is specified */
1661                         if (!(flags & MSG_WAITALL))
1662                                 return 1;
1663                 }
1664
1665                 /* minimum data length for read exceeded */
1666                 if (len >= target)
1667                         return 1;
1668
1669                 skb = skb->next;
1670         }
1671
1672         return 0;
1673 }
1674
1675
1676 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1677         struct msghdr *msg, size_t size, int flags)
1678 {
1679         struct sock *sk = sock->sk;
1680         struct dn_scp *scp = DN_SK(sk);
1681         struct sk_buff_head *queue = &sk->sk_receive_queue;
1682         size_t target = size > 1 ? 1 : 0;
1683         size_t copied = 0;
1684         int rv = 0;
1685         struct sk_buff *skb, *nskb;
1686         struct dn_skb_cb *cb = NULL;
1687         unsigned char eor = 0;
1688         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1689
1690         lock_sock(sk);
1691
1692         if (sock_flag(sk, SOCK_ZAPPED)) {
1693                 rv = -EADDRNOTAVAIL;
1694                 goto out;
1695         }
1696
1697         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1698                 rv = 0;
1699                 goto out;
1700         }
1701
1702         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1703         if (rv)
1704                 goto out;
1705
1706         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1707                 rv = -EOPNOTSUPP;
1708                 goto out;
1709         }
1710
1711         if (flags & MSG_OOB)
1712                 queue = &scp->other_receive_queue;
1713
1714         if (flags & MSG_WAITALL)
1715                 target = size;
1716
1717
1718         /*
1719          * See if there is data ready to read, sleep if there isn't
1720          */
1721         for(;;) {
1722                 if (sk->sk_err)
1723                         goto out;
1724
1725                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1726                         if (!(flags & MSG_OOB)) {
1727                                 msg->msg_flags |= MSG_OOB;
1728                                 if (!scp->other_report) {
1729                                         scp->other_report = 1;
1730                                         goto out;
1731                                 }
1732                         }
1733                 }
1734
1735                 if (scp->state != DN_RUN)
1736                         goto out;
1737
1738                 if (signal_pending(current)) {
1739                         rv = sock_intr_errno(timeo);
1740                         goto out;
1741                 }
1742
1743                 if (dn_data_ready(sk, queue, flags, target))
1744                         break;
1745
1746                 if (flags & MSG_DONTWAIT) {
1747                         rv = -EWOULDBLOCK;
1748                         goto out;
1749                 }
1750
1751                 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1752                 SOCK_SLEEP_PRE(sk)
1753
1754                 if (!dn_data_ready(sk, queue, flags, target))
1755                         schedule();
1756
1757                 SOCK_SLEEP_POST(sk)
1758                 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1759         }
1760
1761         for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
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_toiovec(msg->msg_iov, 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                 nskb = skb->next;
1779
1780                 if (skb->len == 0) {
1781                         skb_unlink(skb, queue);
1782                         kfree_skb(skb);
1783                         /*
1784                          * N.B. Don't refer to skb or cb after this point
1785                          * in loop.
1786                          */
1787                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1788                                 scp->flowloc_sw = DN_SEND;
1789                                 dn_nsp_send_link(sk, DN_SEND, 0);
1790                         }
1791                 }
1792
1793                 if (eor) {
1794                         if (sk->sk_type == SOCK_SEQPACKET)
1795                                 break;
1796                         if (!(flags & MSG_WAITALL))
1797                                 break;
1798                 }
1799
1800                 if (flags & MSG_OOB)
1801                         break;
1802
1803                 if (copied >= target)
1804                         break;
1805         }
1806
1807         rv = copied;
1808
1809
1810         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1811                 msg->msg_flags |= MSG_EOR;
1812
1813 out:
1814         if (rv == 0)
1815                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1816
1817         if ((rv >= 0) && msg->msg_name) {
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 dn_mss_from_pmtu(struct net_device *dev, int mtu)
1854 {
1855         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1856         if (dev) {
1857                 struct dn_dev *dn_db = 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 = __constant_htons(ETH_P_DNA_RT);
1908                 skb->pkt_type = PACKET_OUTGOING;
1909         }
1910         return skb;
1911 }
1912
1913 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1914                       struct msghdr *msg, size_t size)
1915 {
1916         struct sock *sk = sock->sk;
1917         struct dn_scp *scp = DN_SK(sk);
1918         size_t mss;
1919         struct sk_buff_head *queue = &scp->data_xmit_queue;
1920         int flags = msg->msg_flags;
1921         int err = 0;
1922         size_t sent = 0;
1923         int addr_len = msg->msg_namelen;
1924         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1925         struct sk_buff *skb = NULL;
1926         struct dn_skb_cb *cb;
1927         size_t len;
1928         unsigned char fctype;
1929         long timeo;
1930
1931         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1932                 return -EOPNOTSUPP;
1933
1934         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1935                 return -EINVAL;
1936
1937         lock_sock(sk);
1938         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1939         /*
1940          * The only difference between stream sockets and sequenced packet
1941          * sockets is that the stream sockets always behave as if MSG_EOR
1942          * has been set.
1943          */
1944         if (sock->type == SOCK_STREAM) {
1945                 if (flags & MSG_EOR) {
1946                         err = -EINVAL;
1947                         goto out;
1948                 }
1949                 flags |= MSG_EOR;
1950         }
1951
1952
1953         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1954         if (err)
1955                 goto out_err;
1956
1957         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1958                 err = -EPIPE;
1959                 if (!(flags & MSG_NOSIGNAL))
1960                         send_sig(SIGPIPE, current, 0);
1961                 goto out_err;
1962         }
1963
1964         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1965                 dst_negative_advice(&sk->sk_dst_cache);
1966
1967         mss = scp->segsize_rem;
1968         fctype = scp->services_rem & NSP_FC_MASK;
1969
1970         mss = dn_current_mss(sk, flags);
1971
1972         if (flags & MSG_OOB) {
1973                 queue = &scp->other_xmit_queue;
1974                 if (size > mss) {
1975                         err = -EMSGSIZE;
1976                         goto out;
1977                 }
1978         }
1979
1980         scp->persist_fxn = dn_nsp_xmit_timeout;
1981
1982         while(sent < size) {
1983                 err = sock_error(sk);
1984                 if (err)
1985                         goto out;
1986
1987                 if (signal_pending(current)) {
1988                         err = sock_intr_errno(timeo);
1989                         goto out;
1990                 }
1991
1992                 /*
1993                  * Calculate size that we wish to send.
1994                  */
1995                 len = size - sent;
1996
1997                 if (len > mss)
1998                         len = mss;
1999
2000                 /*
2001                  * Wait for queue size to go down below the window
2002                  * size.
2003                  */
2004                 if (dn_queue_too_long(scp, queue, flags)) {
2005                         if (flags & MSG_DONTWAIT) {
2006                                 err = -EWOULDBLOCK;
2007                                 goto out;
2008                         }
2009
2010                         SOCK_SLEEP_PRE(sk)
2011
2012                         if (dn_queue_too_long(scp, queue, flags))
2013                                 schedule();
2014
2015                         SOCK_SLEEP_POST(sk)
2016
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_fromiovec(skb_put(skb, len), msg->msg_iov, 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         if (skb)
2075                 kfree_skb(skb);
2076
2077         release_sock(sk);
2078
2079         return sent ? sent : err;
2080
2081 out_err:
2082         err = sk_stream_error(sk, flags, err);
2083         release_sock(sk);
2084         return err;
2085 }
2086
2087 static int dn_device_event(struct notifier_block *this, unsigned long event,
2088                         void *ptr)
2089 {
2090         struct net_device *dev = (struct net_device *)ptr;
2091
2092         if (dev->nd_net != &init_net)
2093                 return NOTIFY_DONE;
2094
2095         switch(event) {
2096                 case NETDEV_UP:
2097                         dn_dev_up(dev);
2098                         break;
2099                 case NETDEV_DOWN:
2100                         dn_dev_down(dev);
2101                         break;
2102                 default:
2103                         break;
2104         }
2105
2106         return NOTIFY_DONE;
2107 }
2108
2109 static struct notifier_block dn_dev_notifier = {
2110         .notifier_call = dn_device_event,
2111 };
2112
2113 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2114
2115 static struct packet_type dn_dix_packet_type = {
2116         .type =         __constant_htons(ETH_P_DNA_RT),
2117         .dev =          NULL,           /* All devices */
2118         .func =         dn_route_rcv,
2119 };
2120
2121 #ifdef CONFIG_PROC_FS
2122 struct dn_iter_state {
2123         int bucket;
2124 };
2125
2126 static struct sock *dn_socket_get_first(struct seq_file *seq)
2127 {
2128         struct dn_iter_state *state = seq->private;
2129         struct sock *n = NULL;
2130
2131         for(state->bucket = 0;
2132             state->bucket < DN_SK_HASH_SIZE;
2133             ++state->bucket) {
2134                 n = sk_head(&dn_sk_hash[state->bucket]);
2135                 if (n)
2136                         break;
2137         }
2138
2139         return n;
2140 }
2141
2142 static struct sock *dn_socket_get_next(struct seq_file *seq,
2143                                        struct sock *n)
2144 {
2145         struct dn_iter_state *state = seq->private;
2146
2147         n = sk_next(n);
2148 try_again:
2149         if (n)
2150                 goto out;
2151         if (++state->bucket >= DN_SK_HASH_SIZE)
2152                 goto out;
2153         n = sk_head(&dn_sk_hash[state->bucket]);
2154         goto try_again;
2155 out:
2156         return n;
2157 }
2158
2159 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2160 {
2161         struct sock *sk = dn_socket_get_first(seq);
2162
2163         if (sk) {
2164                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2165                         --*pos;
2166         }
2167         return *pos ? NULL : sk;
2168 }
2169
2170 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2171 {
2172         void *rc;
2173         read_lock_bh(&dn_hash_lock);
2174         rc = socket_get_idx(seq, &pos);
2175         if (!rc) {
2176                 read_unlock_bh(&dn_hash_lock);
2177         }
2178         return rc;
2179 }
2180
2181 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2182 {
2183         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2184 }
2185
2186 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2187 {
2188         void *rc;
2189
2190         if (v == SEQ_START_TOKEN) {
2191                 rc = dn_socket_get_idx(seq, 0);
2192                 goto out;
2193         }
2194
2195         rc = dn_socket_get_next(seq, v);
2196         if (rc)
2197                 goto out;
2198         read_unlock_bh(&dn_hash_lock);
2199 out:
2200         ++*pos;
2201         return rc;
2202 }
2203
2204 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2205 {
2206         if (v && v != SEQ_START_TOKEN)
2207                 read_unlock_bh(&dn_hash_lock);
2208 }
2209
2210 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2211
2212 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2213 {
2214         int i;
2215
2216         switch (dn_ntohs(dn->sdn_objnamel)) {
2217                 case 0:
2218                         sprintf(buf, "%d", dn->sdn_objnum);
2219                         break;
2220                 default:
2221                         for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2222                                 buf[i] = dn->sdn_objname[i];
2223                                 if (IS_NOT_PRINTABLE(buf[i]))
2224                                         buf[i] = '.';
2225                         }
2226                         buf[i] = 0;
2227         }
2228 }
2229
2230 static char *dn_state2asc(unsigned char state)
2231 {
2232         switch(state) {
2233                 case DN_O:
2234                         return "OPEN";
2235                 case DN_CR:
2236                         return "  CR";
2237                 case DN_DR:
2238                         return "  DR";
2239                 case DN_DRC:
2240                         return " DRC";
2241                 case DN_CC:
2242                         return "  CC";
2243                 case DN_CI:
2244                         return "  CI";
2245                 case DN_NR:
2246                         return "  NR";
2247                 case DN_NC:
2248                         return "  NC";
2249                 case DN_CD:
2250                         return "  CD";
2251                 case DN_RJ:
2252                         return "  RJ";
2253                 case DN_RUN:
2254                         return " RUN";
2255                 case DN_DI:
2256                         return "  DI";
2257                 case DN_DIC:
2258                         return " DIC";
2259                 case DN_DN:
2260                         return "  DN";
2261                 case DN_CL:
2262                         return "  CL";
2263                 case DN_CN:
2264                         return "  CN";
2265         }
2266
2267         return "????";
2268 }
2269
2270 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2271 {
2272         struct dn_scp *scp = DN_SK(sk);
2273         char buf1[DN_ASCBUF_LEN];
2274         char buf2[DN_ASCBUF_LEN];
2275         char local_object[DN_MAXOBJL+3];
2276         char remote_object[DN_MAXOBJL+3];
2277
2278         dn_printable_object(&scp->addr, local_object);
2279         dn_printable_object(&scp->peer, remote_object);
2280
2281         seq_printf(seq,
2282                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2283                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2284                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2285                    scp->addrloc,
2286                    scp->numdat,
2287                    scp->numoth,
2288                    scp->ackxmt_dat,
2289                    scp->ackxmt_oth,
2290                    scp->flowloc_sw,
2291                    local_object,
2292                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2293                    scp->addrrem,
2294                    scp->numdat_rcv,
2295                    scp->numoth_rcv,
2296                    scp->ackrcv_dat,
2297                    scp->ackrcv_oth,
2298                    scp->flowrem_sw,
2299                    remote_object,
2300                    dn_state2asc(scp->state),
2301                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2302 }
2303
2304 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2305 {
2306         if (v == SEQ_START_TOKEN) {
2307                 seq_puts(seq, "Local                                              Remote\n");
2308         } else {
2309                 dn_socket_format_entry(seq, v);
2310         }
2311         return 0;
2312 }
2313
2314 static const struct seq_operations dn_socket_seq_ops = {
2315         .start  = dn_socket_seq_start,
2316         .next   = dn_socket_seq_next,
2317         .stop   = dn_socket_seq_stop,
2318         .show   = dn_socket_seq_show,
2319 };
2320
2321 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2322 {
2323         struct seq_file *seq;
2324         int rc = -ENOMEM;
2325         struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2326
2327         if (!s)
2328                 goto out;
2329
2330         rc = seq_open(file, &dn_socket_seq_ops);
2331         if (rc)
2332                 goto out_kfree;
2333
2334         seq             = file->private_data;
2335         seq->private    = s;
2336         memset(s, 0, sizeof(*s));
2337 out:
2338         return rc;
2339 out_kfree:
2340         kfree(s);
2341         goto out;
2342 }
2343
2344 static const struct file_operations dn_socket_seq_fops = {
2345         .owner          = THIS_MODULE,
2346         .open           = dn_socket_seq_open,
2347         .read           = seq_read,
2348         .llseek         = seq_lseek,
2349         .release        = seq_release_private,
2350 };
2351 #endif
2352
2353 static struct net_proto_family  dn_family_ops = {
2354         .family =       AF_DECnet,
2355         .create =       dn_create,
2356         .owner  =       THIS_MODULE,
2357 };
2358
2359 static const struct proto_ops dn_proto_ops = {
2360         .family =       AF_DECnet,
2361         .owner =        THIS_MODULE,
2362         .release =      dn_release,
2363         .bind =         dn_bind,
2364         .connect =      dn_connect,
2365         .socketpair =   sock_no_socketpair,
2366         .accept =       dn_accept,
2367         .getname =      dn_getname,
2368         .poll =         dn_poll,
2369         .ioctl =        dn_ioctl,
2370         .listen =       dn_listen,
2371         .shutdown =     dn_shutdown,
2372         .setsockopt =   dn_setsockopt,
2373         .getsockopt =   dn_getsockopt,
2374         .sendmsg =      dn_sendmsg,
2375         .recvmsg =      dn_recvmsg,
2376         .mmap =         sock_no_mmap,
2377         .sendpage =     sock_no_sendpage,
2378 };
2379
2380 void dn_register_sysctl(void);
2381 void dn_unregister_sysctl(void);
2382
2383 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2384 MODULE_AUTHOR("Linux DECnet Project Team");
2385 MODULE_LICENSE("GPL");
2386 MODULE_ALIAS_NETPROTO(PF_DECnet);
2387
2388 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2389
2390 static int __init decnet_init(void)
2391 {
2392         int rc;
2393
2394         printk(banner);
2395
2396         rc = proto_register(&dn_proto, 1);
2397         if (rc != 0)
2398                 goto out;
2399
2400         dn_neigh_init();
2401         dn_dev_init();
2402         dn_route_init();
2403         dn_fib_init();
2404
2405         sock_register(&dn_family_ops);
2406         dev_add_pack(&dn_dix_packet_type);
2407         register_netdevice_notifier(&dn_dev_notifier);
2408
2409         proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
2410         dn_register_sysctl();
2411 out:
2412         return rc;
2413
2414 }
2415 module_init(decnet_init);
2416
2417 /*
2418  * Prevent DECnet module unloading until its fixed properly.
2419  * Requires an audit of the code to check for memory leaks and
2420  * initialisation problems etc.
2421  */
2422 #if 0
2423 static void __exit decnet_exit(void)
2424 {
2425         sock_unregister(AF_DECnet);
2426         rtnl_unregister_all(PF_DECnet);
2427         dev_remove_pack(&dn_dix_packet_type);
2428
2429         dn_unregister_sysctl();
2430
2431         unregister_netdevice_notifier(&dn_dev_notifier);
2432
2433         dn_route_cleanup();
2434         dn_dev_cleanup();
2435         dn_neigh_cleanup();
2436         dn_fib_cleanup();
2437
2438         proc_net_remove(&init_net, "decnet");
2439
2440         proto_unregister(&dn_proto);
2441 }
2442 module_exit(decnet_exit);
2443 #endif