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   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[le16_to_cpu(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[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 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 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, le16_to_cpu(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[le16_to_cpu(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(struct sock *sk)
 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 (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
 738                 return -EINVAL;
 739
 740         if (le16_to_cpu(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 (le16_to_cpu(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 = cpu_to_le16(scp->accessdata.acc_accl);
 803                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(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 = cpu_to_le16(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   = cpu_to_le16(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(sock_net(sk), 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                 skb = skb_peek(&scp->other_receive_queue);
1250                 if (skb) {
1251                         amount = skb->len;
1252                 } else {
1253                         skb_queue_walk(&sk->sk_receive_queue, skb)
1254                                 amount += skb->len;
1255                 }
1256                 release_sock(sk);
1257                 err = put_user(amount, (int __user *)arg);
1258                 break;
1259
1260         default:
1261                 err = -ENOIOCTLCMD;
1262                 break;
1263         }
1264
1265         return err;
1266 }
1267
1268 static int dn_listen(struct socket *sock, int backlog)
1269 {
1270         struct sock *sk = sock->sk;
1271         int err = -EINVAL;
1272
1273         lock_sock(sk);
1274
1275         if (sock_flag(sk, SOCK_ZAPPED))
1276                 goto out;
1277
1278         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1279                 goto out;
1280
1281         sk->sk_max_ack_backlog = backlog;
1282         sk->sk_ack_backlog     = 0;
1283         sk->sk_state           = TCP_LISTEN;
1284         err                 = 0;
1285         dn_rehash_sock(sk);
1286
1287 out:
1288         release_sock(sk);
1289
1290         return err;
1291 }
1292
1293
1294 static int dn_shutdown(struct socket *sock, int how)
1295 {
1296         struct sock *sk = sock->sk;
1297         struct dn_scp *scp = DN_SK(sk);
1298         int err = -ENOTCONN;
1299
1300         lock_sock(sk);
1301
1302         if (sock->state == SS_UNCONNECTED)
1303                 goto out;
1304
1305         err = 0;
1306         if (sock->state == SS_DISCONNECTING)
1307                 goto out;
1308
1309         err = -EINVAL;
1310         if (scp->state == DN_O)
1311                 goto out;
1312
1313         if (how != SHUTDOWN_MASK)
1314                 goto out;
1315
1316         sk->sk_shutdown = how;
1317         dn_destroy_sock(sk);
1318         err = 0;
1319
1320 out:
1321         release_sock(sk);
1322
1323         return err;
1324 }
1325
1326 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1327 {
1328         struct sock *sk = sock->sk;
1329         int err;
1330
1331         lock_sock(sk);
1332         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1333         release_sock(sk);
1334
1335         return err;
1336 }
1337
1338 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1339 {
1340         struct  sock *sk = sock->sk;
1341         struct dn_scp *scp = DN_SK(sk);
1342         long timeo;
1343         union {
1344                 struct optdata_dn opt;
1345                 struct accessdata_dn acc;
1346                 int mode;
1347                 unsigned long win;
1348                 int val;
1349                 unsigned char services;
1350                 unsigned char info;
1351         } u;
1352         int err;
1353
1354         if (optlen && !optval)
1355                 return -EINVAL;
1356
1357         if (optlen > sizeof(u))
1358                 return -EINVAL;
1359
1360         if (copy_from_user(&u, optval, optlen))
1361                 return -EFAULT;
1362
1363         switch(optname) {
1364                 case DSO_CONDATA:
1365                         if (sock->state == SS_CONNECTED)
1366                                 return -EISCONN;
1367                         if ((scp->state != DN_O) && (scp->state != DN_CR))
1368                                 return -EINVAL;
1369
1370                         if (optlen != sizeof(struct optdata_dn))
1371                                 return -EINVAL;
1372
1373                         if (le16_to_cpu(u.opt.opt_optl) > 16)
1374                                 return -EINVAL;
1375
1376                         memcpy(&scp->conndata_out, &u.opt, optlen);
1377                         break;
1378
1379                 case DSO_DISDATA:
1380                         if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1381                                 return -ENOTCONN;
1382
1383                         if (optlen != sizeof(struct optdata_dn))
1384                                 return -EINVAL;
1385
1386                         if (le16_to_cpu(u.opt.opt_optl) > 16)
1387                                 return -EINVAL;
1388
1389                         memcpy(&scp->discdata_out, &u.opt, optlen);
1390                         break;
1391
1392                 case DSO_CONACCESS:
1393                         if (sock->state == SS_CONNECTED)
1394                                 return -EISCONN;
1395                         if (scp->state != DN_O)
1396                                 return -EINVAL;
1397
1398                         if (optlen != sizeof(struct accessdata_dn))
1399                                 return -EINVAL;
1400
1401                         if ((u.acc.acc_accl > DN_MAXACCL) ||
1402                                         (u.acc.acc_passl > DN_MAXACCL) ||
1403                                         (u.acc.acc_userl > DN_MAXACCL))
1404                                 return -EINVAL;
1405
1406                         memcpy(&scp->accessdata, &u.acc, optlen);
1407                         break;
1408
1409                 case DSO_ACCEPTMODE:
1410                         if (sock->state == SS_CONNECTED)
1411                                 return -EISCONN;
1412                         if (scp->state != DN_O)
1413                                 return -EINVAL;
1414
1415                         if (optlen != sizeof(int))
1416                                 return -EINVAL;
1417
1418                         if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1419                                 return -EINVAL;
1420
1421                         scp->accept_mode = (unsigned char)u.mode;
1422                         break;
1423
1424                 case DSO_CONACCEPT:
1425
1426                         if (scp->state != DN_CR)
1427                                 return -EINVAL;
1428                         timeo = sock_rcvtimeo(sk, 0);
1429                         err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1430                         return err;
1431
1432                 case DSO_CONREJECT:
1433
1434                         if (scp->state != DN_CR)
1435                                 return -EINVAL;
1436
1437                         scp->state = DN_DR;
1438                         sk->sk_shutdown = SHUTDOWN_MASK;
1439                         dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1440                         break;
1441
1442                 default:
1443 #ifdef CONFIG_NETFILTER
1444                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1445 #endif
1446                 case DSO_LINKINFO:
1447                 case DSO_STREAM:
1448                 case DSO_SEQPACKET:
1449                         return -ENOPROTOOPT;
1450
1451                 case DSO_MAXWINDOW:
1452                         if (optlen != sizeof(unsigned long))
1453                                 return -EINVAL;
1454                         if (u.win > NSP_MAX_WINDOW)
1455                                 u.win = NSP_MAX_WINDOW;
1456                         if (u.win == 0)
1457                                 return -EINVAL;
1458                         scp->max_window = u.win;
1459                         if (scp->snd_window > u.win)
1460                                 scp->snd_window = u.win;
1461                         break;
1462
1463                 case DSO_NODELAY:
1464                         if (optlen != sizeof(int))
1465                                 return -EINVAL;
1466                         if (scp->nonagle == 2)
1467                                 return -EINVAL;
1468                         scp->nonagle = (u.val == 0) ? 0 : 1;
1469                         /* if (scp->nonagle == 1) { Push pending frames } */
1470                         break;
1471
1472                 case DSO_CORK:
1473                         if (optlen != sizeof(int))
1474                                 return -EINVAL;
1475                         if (scp->nonagle == 1)
1476                                 return -EINVAL;
1477                         scp->nonagle = (u.val == 0) ? 0 : 2;
1478                         /* if (scp->nonagle == 0) { Push pending frames } */
1479                         break;
1480
1481                 case DSO_SERVICES:
1482                         if (optlen != sizeof(unsigned char))
1483                                 return -EINVAL;
1484                         if ((u.services & ~NSP_FC_MASK) != 0x01)
1485                                 return -EINVAL;
1486                         if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1487                                 return -EINVAL;
1488                         scp->services_loc = u.services;
1489                         break;
1490
1491                 case DSO_INFO:
1492                         if (optlen != sizeof(unsigned char))
1493                                 return -EINVAL;
1494                         if (u.info & 0xfc)
1495                                 return -EINVAL;
1496                         scp->info_loc = u.info;
1497                         break;
1498         }
1499
1500         return 0;
1501 }
1502
1503 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1504 {
1505         struct sock *sk = sock->sk;
1506         int err;
1507
1508         lock_sock(sk);
1509         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1510         release_sock(sk);
1511
1512         return err;
1513 }
1514
1515 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1516 {
1517         struct  sock *sk = sock->sk;
1518         struct dn_scp *scp = DN_SK(sk);
1519         struct linkinfo_dn link;
1520         unsigned int r_len;
1521         void *r_data = NULL;
1522         unsigned int val;
1523
1524         if(get_user(r_len , optlen))
1525                 return -EFAULT;
1526
1527         switch(optname) {
1528                 case DSO_CONDATA:
1529                         if (r_len > sizeof(struct optdata_dn))
1530                                 r_len = sizeof(struct optdata_dn);
1531                         r_data = &scp->conndata_in;
1532                         break;
1533
1534                 case DSO_DISDATA:
1535                         if (r_len > sizeof(struct optdata_dn))
1536                                 r_len = sizeof(struct optdata_dn);
1537                         r_data = &scp->discdata_in;
1538                         break;
1539
1540                 case DSO_CONACCESS:
1541                         if (r_len > sizeof(struct accessdata_dn))
1542                                 r_len = sizeof(struct accessdata_dn);
1543                         r_data = &scp->accessdata;
1544                         break;
1545
1546                 case DSO_ACCEPTMODE:
1547                         if (r_len > sizeof(unsigned char))
1548                                 r_len = sizeof(unsigned char);
1549                         r_data = &scp->accept_mode;
1550                         break;
1551
1552                 case DSO_LINKINFO:
1553                         if (r_len > sizeof(struct linkinfo_dn))
1554                                 r_len = sizeof(struct linkinfo_dn);
1555
1556                         switch(sock->state) {
1557                                 case SS_CONNECTING:
1558                                         link.idn_linkstate = LL_CONNECTING;
1559                                         break;
1560                                 case SS_DISCONNECTING:
1561                                         link.idn_linkstate = LL_DISCONNECTING;
1562                                         break;
1563                                 case SS_CONNECTED:
1564                                         link.idn_linkstate = LL_RUNNING;
1565                                         break;
1566                                 default:
1567                                         link.idn_linkstate = LL_INACTIVE;
1568                         }
1569
1570                         link.idn_segsize = scp->segsize_rem;
1571                         r_data = &link;
1572                         break;
1573
1574                 default:
1575 #ifdef CONFIG_NETFILTER
1576                 {
1577                         int ret, len;
1578
1579                         if(get_user(len, optlen))
1580                                 return -EFAULT;
1581
1582                         ret = nf_getsockopt(sk, PF_DECnet, optname,
1583                                                         optval, &len);
1584                         if (ret >= 0)
1585                                 ret = put_user(len, optlen);
1586                         return ret;
1587                 }
1588 #endif
1589                 case DSO_STREAM:
1590                 case DSO_SEQPACKET:
1591                 case DSO_CONACCEPT:
1592                 case DSO_CONREJECT:
1593                         return -ENOPROTOOPT;
1594
1595                 case DSO_MAXWINDOW:
1596                         if (r_len > sizeof(unsigned long))
1597                                 r_len = sizeof(unsigned long);
1598                         r_data = &scp->max_window;
1599                         break;
1600
1601                 case DSO_NODELAY:
1602                         if (r_len > sizeof(int))
1603                                 r_len = sizeof(int);
1604                         val = (scp->nonagle == 1);
1605                         r_data = &val;
1606                         break;
1607
1608                 case DSO_CORK:
1609                         if (r_len > sizeof(int))
1610                                 r_len = sizeof(int);
1611                         val = (scp->nonagle == 2);
1612                         r_data = &val;
1613                         break;
1614
1615                 case DSO_SERVICES:
1616                         if (r_len > sizeof(unsigned char))
1617                                 r_len = sizeof(unsigned char);
1618                         r_data = &scp->services_rem;
1619                         break;
1620
1621                 case DSO_INFO:
1622                         if (r_len > sizeof(unsigned char))
1623                                 r_len = sizeof(unsigned char);
1624                         r_data = &scp->info_rem;
1625                         break;
1626         }
1627
1628         if (r_data) {
1629                 if (copy_to_user(optval, r_data, r_len))
1630                         return -EFAULT;
1631                 if (put_user(r_len, optlen))
1632                         return -EFAULT;
1633         }
1634
1635         return 0;
1636 }
1637
1638
1639 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1640 {
1641         struct sk_buff *skb;
1642         int len = 0;
1643
1644         if (flags & MSG_OOB)
1645                 return !skb_queue_empty(q) ? 1 : 0;
1646
1647         skb_queue_walk(q, skb) {
1648                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1649                 len += skb->len;
1650
1651                 if (cb->nsp_flags & 0x40) {
1652                         /* SOCK_SEQPACKET reads to EOM */
1653                         if (sk->sk_type == SOCK_SEQPACKET)
1654                                 return 1;
1655                         /* so does SOCK_STREAM unless WAITALL is specified */
1656                         if (!(flags & MSG_WAITALL))
1657                                 return 1;
1658                 }
1659
1660                 /* minimum data length for read exceeded */
1661                 if (len >= target)
1662                         return 1;
1663         }
1664
1665         return 0;
1666 }
1667
1668
1669 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1670         struct msghdr *msg, size_t size, int flags)
1671 {
1672         struct sock *sk = sock->sk;
1673         struct dn_scp *scp = DN_SK(sk);
1674         struct sk_buff_head *queue = &sk->sk_receive_queue;
1675         size_t target = size > 1 ? 1 : 0;
1676         size_t copied = 0;
1677         int rv = 0;
1678         struct sk_buff *skb, *n;
1679         struct dn_skb_cb *cb = NULL;
1680         unsigned char eor = 0;
1681         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1682
1683         lock_sock(sk);
1684
1685         if (sock_flag(sk, SOCK_ZAPPED)) {
1686                 rv = -EADDRNOTAVAIL;
1687                 goto out;
1688         }
1689
1690         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1691                 rv = 0;
1692                 goto out;
1693         }
1694
1695         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1696         if (rv)
1697                 goto out;
1698
1699         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1700                 rv = -EOPNOTSUPP;
1701                 goto out;
1702         }
1703
1704         if (flags & MSG_OOB)
1705                 queue = &scp->other_receive_queue;
1706
1707         if (flags & MSG_WAITALL)
1708                 target = size;
1709
1710
1711         /*
1712          * See if there is data ready to read, sleep if there isn't
1713          */
1714         for(;;) {
1715                 DEFINE_WAIT(wait);
1716
1717                 if (sk->sk_err)
1718                         goto out;
1719
1720                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1721                         if (!(flags & MSG_OOB)) {
1722                                 msg->msg_flags |= MSG_OOB;
1723                                 if (!scp->other_report) {
1724                                         scp->other_report = 1;
1725                                         goto out;
1726                                 }
1727                         }
1728                 }
1729
1730                 if (scp->state != DN_RUN)
1731                         goto out;
1732
1733                 if (signal_pending(current)) {
1734                         rv = sock_intr_errno(timeo);
1735                         goto out;
1736                 }
1737
1738                 if (dn_data_ready(sk, queue, flags, target))
1739                         break;
1740
1741                 if (flags & MSG_DONTWAIT) {
1742                         rv = -EWOULDBLOCK;
1743                         goto out;
1744                 }
1745
1746                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1747                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1748                 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1749                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1750                 finish_wait(sk->sk_sleep, &wait);
1751         }
1752
1753         skb_queue_walk_safe(queue, skb, n) {
1754                 unsigned int chunk = skb->len;
1755                 cb = DN_SKB_CB(skb);
1756
1757                 if ((chunk + copied) > size)
1758                         chunk = size - copied;
1759
1760                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1761                         rv = -EFAULT;
1762                         break;
1763                 }
1764                 copied += chunk;
1765
1766                 if (!(flags & MSG_PEEK))
1767                         skb_pull(skb, chunk);
1768
1769                 eor = cb->nsp_flags & 0x40;
1770
1771                 if (skb->len == 0) {
1772                         skb_unlink(skb, queue);
1773                         kfree_skb(skb);
1774                         /*
1775                          * N.B. Don't refer to skb or cb after this point
1776                          * in loop.
1777                          */
1778                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1779                                 scp->flowloc_sw = DN_SEND;
1780                                 dn_nsp_send_link(sk, DN_SEND, 0);
1781                         }
1782                 }
1783
1784                 if (eor) {
1785                         if (sk->sk_type == SOCK_SEQPACKET)
1786                                 break;
1787                         if (!(flags & MSG_WAITALL))
1788                                 break;
1789                 }
1790
1791                 if (flags & MSG_OOB)
1792                         break;
1793
1794                 if (copied >= target)
1795                         break;
1796         }
1797
1798         rv = copied;
1799
1800
1801         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1802                 msg->msg_flags |= MSG_EOR;
1803
1804 out:
1805         if (rv == 0)
1806                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1807
1808         if ((rv >= 0) && msg->msg_name) {
1809                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1810                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1811         }
1812
1813         release_sock(sk);
1814
1815         return rv;
1816 }
1817
1818
1819 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1820 {
1821         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1822         if (skb_queue_len(queue) >= scp->snd_window)
1823                 return 1;
1824         if (fctype != NSP_FC_NONE) {
1825                 if (flags & MSG_OOB) {
1826                         if (scp->flowrem_oth == 0)
1827                                 return 1;
1828                 } else {
1829                         if (scp->flowrem_dat == 0)
1830                                 return 1;
1831                 }
1832         }
1833         return 0;
1834 }
1835
1836 /*
1837  * The DECnet spec requires that the "routing layer" accepts packets which
1838  * are at least 230 bytes in size. This excludes any headers which the NSP
1839  * layer might add, so we always assume that we'll be using the maximal
1840  * length header on data packets. The variation in length is due to the
1841  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1842  * make much practical difference.
1843  */
1844 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1845 {
1846         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1847         if (dev) {
1848                 struct dn_dev *dn_db = dev->dn_ptr;
1849                 mtu -= LL_RESERVED_SPACE(dev);
1850                 if (dn_db->use_long)
1851                         mtu -= 21;
1852                 else
1853                         mtu -= 6;
1854                 mtu -= DN_MAX_NSP_DATA_HEADER;
1855         } else {
1856                 /*
1857                  * 21 = long header, 16 = guess at MAC header length
1858                  */
1859                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1860         }
1861         if (mtu > mss)
1862                 mss = mtu;
1863         return mss;
1864 }
1865
1866 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1867 {
1868         struct dst_entry *dst = __sk_dst_get(sk);
1869         struct dn_scp *scp = DN_SK(sk);
1870         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1871
1872         /* Other data messages are limited to 16 bytes per packet */
1873         if (flags & MSG_OOB)
1874                 return 16;
1875
1876         /* This works out the maximum size of segment we can send out */
1877         if (dst) {
1878                 u32 mtu = dst_mtu(dst);
1879                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1880         }
1881
1882         return mss_now;
1883 }
1884
1885 /*
1886  * N.B. We get the timeout wrong here, but then we always did get it
1887  * wrong before and this is another step along the road to correcting
1888  * it. It ought to get updated each time we pass through the routine,
1889  * but in practise it probably doesn't matter too much for now.
1890  */
1891 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1892                               unsigned long datalen, int noblock,
1893                               int *errcode)
1894 {
1895         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1896                                                    noblock, errcode);
1897         if (skb) {
1898                 skb->protocol = htons(ETH_P_DNA_RT);
1899                 skb->pkt_type = PACKET_OUTGOING;
1900         }
1901         return skb;
1902 }
1903
1904 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1905                       struct msghdr *msg, size_t size)
1906 {
1907         struct sock *sk = sock->sk;
1908         struct dn_scp *scp = DN_SK(sk);
1909         size_t mss;
1910         struct sk_buff_head *queue = &scp->data_xmit_queue;
1911         int flags = msg->msg_flags;
1912         int err = 0;
1913         size_t sent = 0;
1914         int addr_len = msg->msg_namelen;
1915         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1916         struct sk_buff *skb = NULL;
1917         struct dn_skb_cb *cb;
1918         size_t len;
1919         unsigned char fctype;
1920         long timeo;
1921
1922         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1923                 return -EOPNOTSUPP;
1924
1925         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1926                 return -EINVAL;
1927
1928         lock_sock(sk);
1929         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1930         /*
1931          * The only difference between stream sockets and sequenced packet
1932          * sockets is that the stream sockets always behave as if MSG_EOR
1933          * has been set.
1934          */
1935         if (sock->type == SOCK_STREAM) {
1936                 if (flags & MSG_EOR) {
1937                         err = -EINVAL;
1938                         goto out;
1939                 }
1940                 flags |= MSG_EOR;
1941         }
1942
1943
1944         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1945         if (err)
1946                 goto out_err;
1947
1948         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1949                 err = -EPIPE;
1950                 if (!(flags & MSG_NOSIGNAL))
1951                         send_sig(SIGPIPE, current, 0);
1952                 goto out_err;
1953         }
1954
1955         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1956                 dst_negative_advice(&sk->sk_dst_cache);
1957
1958         mss = scp->segsize_rem;
1959         fctype = scp->services_rem & NSP_FC_MASK;
1960
1961         mss = dn_current_mss(sk, flags);
1962
1963         if (flags & MSG_OOB) {
1964                 queue = &scp->other_xmit_queue;
1965                 if (size > mss) {
1966                         err = -EMSGSIZE;
1967                         goto out;
1968                 }
1969         }
1970
1971         scp->persist_fxn = dn_nsp_xmit_timeout;
1972
1973         while(sent < size) {
1974                 err = sock_error(sk);
1975                 if (err)
1976                         goto out;
1977
1978                 if (signal_pending(current)) {
1979                         err = sock_intr_errno(timeo);
1980                         goto out;
1981                 }
1982
1983                 /*
1984                  * Calculate size that we wish to send.
1985                  */
1986                 len = size - sent;
1987
1988                 if (len > mss)
1989                         len = mss;
1990
1991                 /*
1992                  * Wait for queue size to go down below the window
1993                  * size.
1994                  */
1995                 if (dn_queue_too_long(scp, queue, flags)) {
1996                         DEFINE_WAIT(wait);
1997
1998                         if (flags & MSG_DONTWAIT) {
1999                                 err = -EWOULDBLOCK;
2000                                 goto out;
2001                         }
2002
2003                         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
2004                         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2005                         sk_wait_event(sk, &timeo,
2006                                       !dn_queue_too_long(scp, queue, flags));
2007                         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2008                         finish_wait(sk->sk_sleep, &wait);
2009                         continue;
2010                 }
2011
2012                 /*
2013                  * Get a suitably sized skb.
2014                  * 64 is a bit of a hack really, but its larger than any
2015                  * link-layer headers and has served us well as a good
2016                  * guess as to their real length.
2017                  */
2018                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2019                                          flags & MSG_DONTWAIT, &err);
2020
2021                 if (err)
2022                         break;
2023
2024                 if (!skb)
2025                         continue;
2026
2027                 cb = DN_SKB_CB(skb);
2028
2029                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2030
2031                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2032                         err = -EFAULT;
2033                         goto out;
2034                 }
2035
2036                 if (flags & MSG_OOB) {
2037                         cb->nsp_flags = 0x30;
2038                         if (fctype != NSP_FC_NONE)
2039                                 scp->flowrem_oth--;
2040                 } else {
2041                         cb->nsp_flags = 0x00;
2042                         if (scp->seg_total == 0)
2043                                 cb->nsp_flags |= 0x20;
2044
2045                         scp->seg_total += len;
2046
2047                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2048                                 cb->nsp_flags |= 0x40;
2049                                 scp->seg_total = 0;
2050                                 if (fctype == NSP_FC_SCMC)
2051                                         scp->flowrem_dat--;
2052                         }
2053                         if (fctype == NSP_FC_SRC)
2054                                 scp->flowrem_dat--;
2055                 }
2056
2057                 sent += len;
2058                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2059                 skb = NULL;
2060
2061                 scp->persist = dn_nsp_persist(sk);
2062
2063         }
2064 out:
2065
2066         kfree_skb(skb);
2067
2068         release_sock(sk);
2069
2070         return sent ? sent : err;
2071
2072 out_err:
2073         err = sk_stream_error(sk, flags, err);
2074         release_sock(sk);
2075         return err;
2076 }
2077
2078 static int dn_device_event(struct notifier_block *this, unsigned long event,
2079                         void *ptr)
2080 {
2081         struct net_device *dev = (struct net_device *)ptr;
2082
2083         if (!net_eq(dev_net(dev), &init_net))
2084                 return NOTIFY_DONE;
2085
2086         switch(event) {
2087                 case NETDEV_UP:
2088                         dn_dev_up(dev);
2089                         break;
2090                 case NETDEV_DOWN:
2091                         dn_dev_down(dev);
2092                         break;
2093                 default:
2094                         break;
2095         }
2096
2097         return NOTIFY_DONE;
2098 }
2099
2100 static struct notifier_block dn_dev_notifier = {
2101         .notifier_call = dn_device_event,
2102 };
2103
2104 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2105
2106 static struct packet_type dn_dix_packet_type __read_mostly = {
2107         .type =         cpu_to_be16(ETH_P_DNA_RT),
2108         .func =         dn_route_rcv,
2109 };
2110
2111 #ifdef CONFIG_PROC_FS
2112 struct dn_iter_state {
2113         int bucket;
2114 };
2115
2116 static struct sock *dn_socket_get_first(struct seq_file *seq)
2117 {
2118         struct dn_iter_state *state = seq->private;
2119         struct sock *n = NULL;
2120
2121         for(state->bucket = 0;
2122             state->bucket < DN_SK_HASH_SIZE;
2123             ++state->bucket) {
2124                 n = sk_head(&dn_sk_hash[state->bucket]);
2125                 if (n)
2126                         break;
2127         }
2128
2129         return n;
2130 }
2131
2132 static struct sock *dn_socket_get_next(struct seq_file *seq,
2133                                        struct sock *n)
2134 {
2135         struct dn_iter_state *state = seq->private;
2136
2137         n = sk_next(n);
2138 try_again:
2139         if (n)
2140                 goto out;
2141         if (++state->bucket >= DN_SK_HASH_SIZE)
2142                 goto out;
2143         n = sk_head(&dn_sk_hash[state->bucket]);
2144         goto try_again;
2145 out:
2146         return n;
2147 }
2148
2149 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2150 {
2151         struct sock *sk = dn_socket_get_first(seq);
2152
2153         if (sk) {
2154                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2155                         --*pos;
2156         }
2157         return *pos ? NULL : sk;
2158 }
2159
2160 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2161 {
2162         void *rc;
2163         read_lock_bh(&dn_hash_lock);
2164         rc = socket_get_idx(seq, &pos);
2165         if (!rc) {
2166                 read_unlock_bh(&dn_hash_lock);
2167         }
2168         return rc;
2169 }
2170
2171 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2172 {
2173         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2174 }
2175
2176 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2177 {
2178         void *rc;
2179
2180         if (v == SEQ_START_TOKEN) {
2181                 rc = dn_socket_get_idx(seq, 0);
2182                 goto out;
2183         }
2184
2185         rc = dn_socket_get_next(seq, v);
2186         if (rc)
2187                 goto out;
2188         read_unlock_bh(&dn_hash_lock);
2189 out:
2190         ++*pos;
2191         return rc;
2192 }
2193
2194 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2195 {
2196         if (v && v != SEQ_START_TOKEN)
2197                 read_unlock_bh(&dn_hash_lock);
2198 }
2199
2200 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2201
2202 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2203 {
2204         int i;
2205
2206         switch (le16_to_cpu(dn->sdn_objnamel)) {
2207                 case 0:
2208                         sprintf(buf, "%d", dn->sdn_objnum);
2209                         break;
2210                 default:
2211                         for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2212                                 buf[i] = dn->sdn_objname[i];
2213                                 if (IS_NOT_PRINTABLE(buf[i]))
2214                                         buf[i] = '.';
2215                         }
2216                         buf[i] = 0;
2217         }
2218 }
2219
2220 static char *dn_state2asc(unsigned char state)
2221 {
2222         switch(state) {
2223                 case DN_O:
2224                         return "OPEN";
2225                 case DN_CR:
2226                         return "  CR";
2227                 case DN_DR:
2228                         return "  DR";
2229                 case DN_DRC:
2230                         return " DRC";
2231                 case DN_CC:
2232                         return "  CC";
2233                 case DN_CI:
2234                         return "  CI";
2235                 case DN_NR:
2236                         return "  NR";
2237                 case DN_NC:
2238                         return "  NC";
2239                 case DN_CD:
2240                         return "  CD";
2241                 case DN_RJ:
2242                         return "  RJ";
2243                 case DN_RUN:
2244                         return " RUN";
2245                 case DN_DI:
2246                         return "  DI";
2247                 case DN_DIC:
2248                         return " DIC";
2249                 case DN_DN:
2250                         return "  DN";
2251                 case DN_CL:
2252                         return "  CL";
2253                 case DN_CN:
2254                         return "  CN";
2255         }
2256
2257         return "????";
2258 }
2259
2260 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2261 {
2262         struct dn_scp *scp = DN_SK(sk);
2263         char buf1[DN_ASCBUF_LEN];
2264         char buf2[DN_ASCBUF_LEN];
2265         char local_object[DN_MAXOBJL+3];
2266         char remote_object[DN_MAXOBJL+3];
2267
2268         dn_printable_object(&scp->addr, local_object);
2269         dn_printable_object(&scp->peer, remote_object);
2270
2271         seq_printf(seq,
2272                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2273                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2274                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2275                    scp->addrloc,
2276                    scp->numdat,
2277                    scp->numoth,
2278                    scp->ackxmt_dat,
2279                    scp->ackxmt_oth,
2280                    scp->flowloc_sw,
2281                    local_object,
2282                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2283                    scp->addrrem,
2284                    scp->numdat_rcv,
2285                    scp->numoth_rcv,
2286                    scp->ackrcv_dat,
2287                    scp->ackrcv_oth,
2288                    scp->flowrem_sw,
2289                    remote_object,
2290                    dn_state2asc(scp->state),
2291                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2292 }
2293
2294 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2295 {
2296         if (v == SEQ_START_TOKEN) {
2297                 seq_puts(seq, "Local                                              Remote\n");
2298         } else {
2299                 dn_socket_format_entry(seq, v);
2300         }
2301         return 0;
2302 }
2303
2304 static const struct seq_operations dn_socket_seq_ops = {
2305         .start  = dn_socket_seq_start,
2306         .next   = dn_socket_seq_next,
2307         .stop   = dn_socket_seq_stop,
2308         .show   = dn_socket_seq_show,
2309 };
2310
2311 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2312 {
2313         return seq_open_private(file, &dn_socket_seq_ops,
2314                         sizeof(struct dn_iter_state));
2315 }
2316
2317 static const struct file_operations dn_socket_seq_fops = {
2318         .owner          = THIS_MODULE,
2319         .open           = dn_socket_seq_open,
2320         .read           = seq_read,
2321         .llseek         = seq_lseek,
2322         .release        = seq_release_private,
2323 };
2324 #endif
2325
2326 static struct net_proto_family  dn_family_ops = {
2327         .family =       AF_DECnet,
2328         .create =       dn_create,
2329         .owner  =       THIS_MODULE,
2330 };
2331
2332 static const struct proto_ops dn_proto_ops = {
2333         .family =       AF_DECnet,
2334         .owner =        THIS_MODULE,
2335         .release =      dn_release,
2336         .bind =         dn_bind,
2337         .connect =      dn_connect,
2338         .socketpair =   sock_no_socketpair,
2339         .accept =       dn_accept,
2340         .getname =      dn_getname,
2341         .poll =         dn_poll,
2342         .ioctl =        dn_ioctl,
2343         .listen =       dn_listen,
2344         .shutdown =     dn_shutdown,
2345         .setsockopt =   dn_setsockopt,
2346         .getsockopt =   dn_getsockopt,
2347         .sendmsg =      dn_sendmsg,
2348         .recvmsg =      dn_recvmsg,
2349         .mmap =         sock_no_mmap,
2350         .sendpage =     sock_no_sendpage,
2351 };
2352
2353 void dn_register_sysctl(void);
2354 void dn_unregister_sysctl(void);
2355
2356 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2357 MODULE_AUTHOR("Linux DECnet Project Team");
2358 MODULE_LICENSE("GPL");
2359 MODULE_ALIAS_NETPROTO(PF_DECnet);
2360
2361 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2362
2363 static int __init decnet_init(void)
2364 {
2365         int rc;
2366
2367         printk(banner);
2368
2369         rc = proto_register(&dn_proto, 1);
2370         if (rc != 0)
2371                 goto out;
2372
2373         dn_neigh_init();
2374         dn_dev_init();
2375         dn_route_init();
2376         dn_fib_init();
2377
2378         sock_register(&dn_family_ops);
2379         dev_add_pack(&dn_dix_packet_type);
2380         register_netdevice_notifier(&dn_dev_notifier);
2381
2382         proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
2383         dn_register_sysctl();
2384 out:
2385         return rc;
2386
2387 }
2388 module_init(decnet_init);
2389
2390 /*
2391  * Prevent DECnet module unloading until its fixed properly.
2392  * Requires an audit of the code to check for memory leaks and
2393  * initialisation problems etc.
2394  */
2395 #if 0
2396 static void __exit decnet_exit(void)
2397 {
2398         sock_unregister(AF_DECnet);
2399         rtnl_unregister_all(PF_DECnet);
2400         dev_remove_pack(&dn_dix_packet_type);
2401
2402         dn_unregister_sysctl();
2403
2404         unregister_netdevice_notifier(&dn_dev_notifier);
2405
2406         dn_route_cleanup();
2407         dn_dev_cleanup();
2408         dn_neigh_cleanup();
2409         dn_fib_cleanup();
2410
2411         proc_net_remove(&init_net, "decnet");
2412
2413         proto_unregister(&dn_proto);
2414 }
2415 module_exit(decnet_exit);
2416 #endif