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[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         struct dst_entry *dst;
1079
1080         lock_sock(sk);
1081
1082         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1083                 release_sock(sk);
1084                 return -EINVAL;
1085         }
1086
1087         skb = skb_dequeue(&sk->sk_receive_queue);
1088         if (skb == NULL) {
1089                 skb = dn_wait_for_connect(sk, &timeo);
1090                 if (IS_ERR(skb)) {
1091                         release_sock(sk);
1092                         return PTR_ERR(skb);
1093                 }
1094         }
1095
1096         cb = DN_SKB_CB(skb);
1097         sk->sk_ack_backlog--;
1098         newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1099         if (newsk == NULL) {
1100                 release_sock(sk);
1101                 kfree_skb(skb);
1102                 return -ENOBUFS;
1103         }
1104         release_sock(sk);
1105
1106         dst = skb_dst(skb);
1107         dst_release(xchg(&newsk->sk_dst_cache, dst));
1108         skb_dst_set(skb, NULL);
1109
1110         DN_SK(newsk)->state        = DN_CR;
1111         DN_SK(newsk)->addrrem      = cb->src_port;
1112         DN_SK(newsk)->services_rem = cb->services;
1113         DN_SK(newsk)->info_rem     = cb->info;
1114         DN_SK(newsk)->segsize_rem  = cb->segsize;
1115         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1116
1117         if (DN_SK(newsk)->segsize_rem < 230)
1118                 DN_SK(newsk)->segsize_rem = 230;
1119
1120         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1121                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1122
1123         newsk->sk_state  = TCP_LISTEN;
1124         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1125
1126         /*
1127          * If we are listening on a wild socket, we don't want
1128          * the newly created socket on the wrong hash queue.
1129          */
1130         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1131
1132         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1133         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1134         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1135         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1136
1137         menuver = *skb->data;
1138         skb_pull(skb, 1);
1139
1140         if (menuver & DN_MENUVER_ACC)
1141                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1142
1143         if (menuver & DN_MENUVER_USR)
1144                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1145
1146         if (menuver & DN_MENUVER_PRX)
1147                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1148
1149         if (menuver & DN_MENUVER_UIC)
1150                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1151
1152         kfree_skb(skb);
1153
1154         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1155                 sizeof(struct optdata_dn));
1156         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1157                 sizeof(struct optdata_dn));
1158
1159         lock_sock(newsk);
1160         err = dn_hash_sock(newsk);
1161         if (err == 0) {
1162                 sock_reset_flag(newsk, SOCK_ZAPPED);
1163                 dn_send_conn_ack(newsk);
1164
1165                 /*
1166                  * Here we use sk->sk_allocation since although the conn conf is
1167                  * for the newsk, the context is the old socket.
1168                  */
1169                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1170                         err = dn_confirm_accept(newsk, &timeo,
1171                                                 sk->sk_allocation);
1172         }
1173         release_sock(newsk);
1174         return err;
1175 }
1176
1177
1178 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1179 {
1180         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1181         struct sock *sk = sock->sk;
1182         struct dn_scp *scp = DN_SK(sk);
1183
1184         *uaddr_len = sizeof(struct sockaddr_dn);
1185
1186         lock_sock(sk);
1187
1188         if (peer) {
1189                 if ((sock->state != SS_CONNECTED &&
1190                      sock->state != SS_CONNECTING) &&
1191                     scp->accept_mode == ACC_IMMED) {
1192                         release_sock(sk);
1193                         return -ENOTCONN;
1194                 }
1195
1196                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1197         } else {
1198                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1199         }
1200
1201         release_sock(sk);
1202
1203         return 0;
1204 }
1205
1206
1207 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1208 {
1209         struct sock *sk = sock->sk;
1210         struct dn_scp *scp = DN_SK(sk);
1211         int mask = datagram_poll(file, sock, wait);
1212
1213         if (!skb_queue_empty(&scp->other_receive_queue))
1214                 mask |= POLLRDBAND;
1215
1216         return mask;
1217 }
1218
1219 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1220 {
1221         struct sock *sk = sock->sk;
1222         struct dn_scp *scp = DN_SK(sk);
1223         int err = -EOPNOTSUPP;
1224         long amount = 0;
1225         struct sk_buff *skb;
1226         int val;
1227
1228         switch(cmd)
1229         {
1230         case SIOCGIFADDR:
1231         case SIOCSIFADDR:
1232                 return dn_dev_ioctl(cmd, (void __user *)arg);
1233
1234         case SIOCATMARK:
1235                 lock_sock(sk);
1236                 val = !skb_queue_empty(&scp->other_receive_queue);
1237                 if (scp->state != DN_RUN)
1238                         val = -ENOTCONN;
1239                 release_sock(sk);
1240                 return val;
1241
1242         case TIOCOUTQ:
1243                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1244                 if (amount < 0)
1245                         amount = 0;
1246                 err = put_user(amount, (int __user *)arg);
1247                 break;
1248
1249         case TIOCINQ:
1250                 lock_sock(sk);
1251                 skb = skb_peek(&scp->other_receive_queue);
1252                 if (skb) {
1253                         amount = skb->len;
1254                 } else {
1255                         skb_queue_walk(&sk->sk_receive_queue, skb)
1256                                 amount += skb->len;
1257                 }
1258                 release_sock(sk);
1259                 err = put_user(amount, (int __user *)arg);
1260                 break;
1261
1262         default:
1263                 err = -ENOIOCTLCMD;
1264                 break;
1265         }
1266
1267         return err;
1268 }
1269
1270 static int dn_listen(struct socket *sock, int backlog)
1271 {
1272         struct sock *sk = sock->sk;
1273         int err = -EINVAL;
1274
1275         lock_sock(sk);
1276
1277         if (sock_flag(sk, SOCK_ZAPPED))
1278                 goto out;
1279
1280         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1281                 goto out;
1282
1283         sk->sk_max_ack_backlog = backlog;
1284         sk->sk_ack_backlog     = 0;
1285         sk->sk_state           = TCP_LISTEN;
1286         err                 = 0;
1287         dn_rehash_sock(sk);
1288
1289 out:
1290         release_sock(sk);
1291
1292         return err;
1293 }
1294
1295
1296 static int dn_shutdown(struct socket *sock, int how)
1297 {
1298         struct sock *sk = sock->sk;
1299         struct dn_scp *scp = DN_SK(sk);
1300         int err = -ENOTCONN;
1301
1302         lock_sock(sk);
1303
1304         if (sock->state == SS_UNCONNECTED)
1305                 goto out;
1306
1307         err = 0;
1308         if (sock->state == SS_DISCONNECTING)
1309                 goto out;
1310
1311         err = -EINVAL;
1312         if (scp->state == DN_O)
1313                 goto out;
1314
1315         if (how != SHUTDOWN_MASK)
1316                 goto out;
1317
1318         sk->sk_shutdown = how;
1319         dn_destroy_sock(sk);
1320         err = 0;
1321
1322 out:
1323         release_sock(sk);
1324
1325         return err;
1326 }
1327
1328 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1329 {
1330         struct sock *sk = sock->sk;
1331         int err;
1332
1333         lock_sock(sk);
1334         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1335         release_sock(sk);
1336
1337         return err;
1338 }
1339
1340 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1341 {
1342         struct  sock *sk = sock->sk;
1343         struct dn_scp *scp = DN_SK(sk);
1344         long timeo;
1345         union {
1346                 struct optdata_dn opt;
1347                 struct accessdata_dn acc;
1348                 int mode;
1349                 unsigned long win;
1350                 int val;
1351                 unsigned char services;
1352                 unsigned char info;
1353         } u;
1354         int err;
1355
1356         if (optlen && !optval)
1357                 return -EINVAL;
1358
1359         if (optlen > sizeof(u))
1360                 return -EINVAL;
1361
1362         if (copy_from_user(&u, optval, optlen))
1363                 return -EFAULT;
1364
1365         switch(optname) {
1366                 case DSO_CONDATA:
1367                         if (sock->state == SS_CONNECTED)
1368                                 return -EISCONN;
1369                         if ((scp->state != DN_O) && (scp->state != DN_CR))
1370                                 return -EINVAL;
1371
1372                         if (optlen != sizeof(struct optdata_dn))
1373                                 return -EINVAL;
1374
1375                         if (le16_to_cpu(u.opt.opt_optl) > 16)
1376                                 return -EINVAL;
1377
1378                         memcpy(&scp->conndata_out, &u.opt, optlen);
1379                         break;
1380
1381                 case DSO_DISDATA:
1382                         if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1383                                 return -ENOTCONN;
1384
1385                         if (optlen != sizeof(struct optdata_dn))
1386                                 return -EINVAL;
1387
1388                         if (le16_to_cpu(u.opt.opt_optl) > 16)
1389                                 return -EINVAL;
1390
1391                         memcpy(&scp->discdata_out, &u.opt, optlen);
1392                         break;
1393
1394                 case DSO_CONACCESS:
1395                         if (sock->state == SS_CONNECTED)
1396                                 return -EISCONN;
1397                         if (scp->state != DN_O)
1398                                 return -EINVAL;
1399
1400                         if (optlen != sizeof(struct accessdata_dn))
1401                                 return -EINVAL;
1402
1403                         if ((u.acc.acc_accl > DN_MAXACCL) ||
1404                                         (u.acc.acc_passl > DN_MAXACCL) ||
1405                                         (u.acc.acc_userl > DN_MAXACCL))
1406                                 return -EINVAL;
1407
1408                         memcpy(&scp->accessdata, &u.acc, optlen);
1409                         break;
1410
1411                 case DSO_ACCEPTMODE:
1412                         if (sock->state == SS_CONNECTED)
1413                                 return -EISCONN;
1414                         if (scp->state != DN_O)
1415                                 return -EINVAL;
1416
1417                         if (optlen != sizeof(int))
1418                                 return -EINVAL;
1419
1420                         if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1421                                 return -EINVAL;
1422
1423                         scp->accept_mode = (unsigned char)u.mode;
1424                         break;
1425
1426                 case DSO_CONACCEPT:
1427
1428                         if (scp->state != DN_CR)
1429                                 return -EINVAL;
1430                         timeo = sock_rcvtimeo(sk, 0);
1431                         err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1432                         return err;
1433
1434                 case DSO_CONREJECT:
1435
1436                         if (scp->state != DN_CR)
1437                                 return -EINVAL;
1438
1439                         scp->state = DN_DR;
1440                         sk->sk_shutdown = SHUTDOWN_MASK;
1441                         dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1442                         break;
1443
1444                 default:
1445 #ifdef CONFIG_NETFILTER
1446                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1447 #endif
1448                 case DSO_LINKINFO:
1449                 case DSO_STREAM:
1450                 case DSO_SEQPACKET:
1451                         return -ENOPROTOOPT;
1452
1453                 case DSO_MAXWINDOW:
1454                         if (optlen != sizeof(unsigned long))
1455                                 return -EINVAL;
1456                         if (u.win > NSP_MAX_WINDOW)
1457                                 u.win = NSP_MAX_WINDOW;
1458                         if (u.win == 0)
1459                                 return -EINVAL;
1460                         scp->max_window = u.win;
1461                         if (scp->snd_window > u.win)
1462                                 scp->snd_window = u.win;
1463                         break;
1464
1465                 case DSO_NODELAY:
1466                         if (optlen != sizeof(int))
1467                                 return -EINVAL;
1468                         if (scp->nonagle == 2)
1469                                 return -EINVAL;
1470                         scp->nonagle = (u.val == 0) ? 0 : 1;
1471                         /* if (scp->nonagle == 1) { Push pending frames } */
1472                         break;
1473
1474                 case DSO_CORK:
1475                         if (optlen != sizeof(int))
1476                                 return -EINVAL;
1477                         if (scp->nonagle == 1)
1478                                 return -EINVAL;
1479                         scp->nonagle = (u.val == 0) ? 0 : 2;
1480                         /* if (scp->nonagle == 0) { Push pending frames } */
1481                         break;
1482
1483                 case DSO_SERVICES:
1484                         if (optlen != sizeof(unsigned char))
1485                                 return -EINVAL;
1486                         if ((u.services & ~NSP_FC_MASK) != 0x01)
1487                                 return -EINVAL;
1488                         if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1489                                 return -EINVAL;
1490                         scp->services_loc = u.services;
1491                         break;
1492
1493                 case DSO_INFO:
1494                         if (optlen != sizeof(unsigned char))
1495                                 return -EINVAL;
1496                         if (u.info & 0xfc)
1497                                 return -EINVAL;
1498                         scp->info_loc = u.info;
1499                         break;
1500         }
1501
1502         return 0;
1503 }
1504
1505 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1506 {
1507         struct sock *sk = sock->sk;
1508         int err;
1509
1510         lock_sock(sk);
1511         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1512         release_sock(sk);
1513
1514         return err;
1515 }
1516
1517 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1518 {
1519         struct  sock *sk = sock->sk;
1520         struct dn_scp *scp = DN_SK(sk);
1521         struct linkinfo_dn link;
1522         unsigned int r_len;
1523         void *r_data = NULL;
1524         unsigned int val;
1525
1526         if(get_user(r_len , optlen))
1527                 return -EFAULT;
1528
1529         switch(optname) {
1530                 case DSO_CONDATA:
1531                         if (r_len > sizeof(struct optdata_dn))
1532                                 r_len = sizeof(struct optdata_dn);
1533                         r_data = &scp->conndata_in;
1534                         break;
1535
1536                 case DSO_DISDATA:
1537                         if (r_len > sizeof(struct optdata_dn))
1538                                 r_len = sizeof(struct optdata_dn);
1539                         r_data = &scp->discdata_in;
1540                         break;
1541
1542                 case DSO_CONACCESS:
1543                         if (r_len > sizeof(struct accessdata_dn))
1544                                 r_len = sizeof(struct accessdata_dn);
1545                         r_data = &scp->accessdata;
1546                         break;
1547
1548                 case DSO_ACCEPTMODE:
1549                         if (r_len > sizeof(unsigned char))
1550                                 r_len = sizeof(unsigned char);
1551                         r_data = &scp->accept_mode;
1552                         break;
1553
1554                 case DSO_LINKINFO:
1555                         if (r_len > sizeof(struct linkinfo_dn))
1556                                 r_len = sizeof(struct linkinfo_dn);
1557
1558                         switch(sock->state) {
1559                                 case SS_CONNECTING:
1560                                         link.idn_linkstate = LL_CONNECTING;
1561                                         break;
1562                                 case SS_DISCONNECTING:
1563                                         link.idn_linkstate = LL_DISCONNECTING;
1564                                         break;
1565                                 case SS_CONNECTED:
1566                                         link.idn_linkstate = LL_RUNNING;
1567                                         break;
1568                                 default:
1569                                         link.idn_linkstate = LL_INACTIVE;
1570                         }
1571
1572                         link.idn_segsize = scp->segsize_rem;
1573                         r_data = &link;
1574                         break;
1575
1576                 default:
1577 #ifdef CONFIG_NETFILTER
1578                 {
1579                         int ret, len;
1580
1581                         if(get_user(len, optlen))
1582                                 return -EFAULT;
1583
1584                         ret = nf_getsockopt(sk, PF_DECnet, optname,
1585                                                         optval, &len);
1586                         if (ret >= 0)
1587                                 ret = put_user(len, optlen);
1588                         return ret;
1589                 }
1590 #endif
1591                 case DSO_STREAM:
1592                 case DSO_SEQPACKET:
1593                 case DSO_CONACCEPT:
1594                 case DSO_CONREJECT:
1595                         return -ENOPROTOOPT;
1596
1597                 case DSO_MAXWINDOW:
1598                         if (r_len > sizeof(unsigned long))
1599                                 r_len = sizeof(unsigned long);
1600                         r_data = &scp->max_window;
1601                         break;
1602
1603                 case DSO_NODELAY:
1604                         if (r_len > sizeof(int))
1605                                 r_len = sizeof(int);
1606                         val = (scp->nonagle == 1);
1607                         r_data = &val;
1608                         break;
1609
1610                 case DSO_CORK:
1611                         if (r_len > sizeof(int))
1612                                 r_len = sizeof(int);
1613                         val = (scp->nonagle == 2);
1614                         r_data = &val;
1615                         break;
1616
1617                 case DSO_SERVICES:
1618                         if (r_len > sizeof(unsigned char))
1619                                 r_len = sizeof(unsigned char);
1620                         r_data = &scp->services_rem;
1621                         break;
1622
1623                 case DSO_INFO:
1624                         if (r_len > sizeof(unsigned char))
1625                                 r_len = sizeof(unsigned char);
1626                         r_data = &scp->info_rem;
1627                         break;
1628         }
1629
1630         if (r_data) {
1631                 if (copy_to_user(optval, r_data, r_len))
1632                         return -EFAULT;
1633                 if (put_user(r_len, optlen))
1634                         return -EFAULT;
1635         }
1636
1637         return 0;
1638 }
1639
1640
1641 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1642 {
1643         struct sk_buff *skb;
1644         int len = 0;
1645
1646         if (flags & MSG_OOB)
1647                 return !skb_queue_empty(q) ? 1 : 0;
1648
1649         skb_queue_walk(q, skb) {
1650                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1651                 len += skb->len;
1652
1653                 if (cb->nsp_flags & 0x40) {
1654                         /* SOCK_SEQPACKET reads to EOM */
1655                         if (sk->sk_type == SOCK_SEQPACKET)
1656                                 return 1;
1657                         /* so does SOCK_STREAM unless WAITALL is specified */
1658                         if (!(flags & MSG_WAITALL))
1659                                 return 1;
1660                 }
1661
1662                 /* minimum data length for read exceeded */
1663                 if (len >= target)
1664                         return 1;
1665         }
1666
1667         return 0;
1668 }
1669
1670
1671 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1672         struct msghdr *msg, size_t size, int flags)
1673 {
1674         struct sock *sk = sock->sk;
1675         struct dn_scp *scp = DN_SK(sk);
1676         struct sk_buff_head *queue = &sk->sk_receive_queue;
1677         size_t target = size > 1 ? 1 : 0;
1678         size_t copied = 0;
1679         int rv = 0;
1680         struct sk_buff *skb, *n;
1681         struct dn_skb_cb *cb = NULL;
1682         unsigned char eor = 0;
1683         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1684
1685         lock_sock(sk);
1686
1687         if (sock_flag(sk, SOCK_ZAPPED)) {
1688                 rv = -EADDRNOTAVAIL;
1689                 goto out;
1690         }
1691
1692         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1693                 rv = 0;
1694                 goto out;
1695         }
1696
1697         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1698         if (rv)
1699                 goto out;
1700
1701         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1702                 rv = -EOPNOTSUPP;
1703                 goto out;
1704         }
1705
1706         if (flags & MSG_OOB)
1707                 queue = &scp->other_receive_queue;
1708
1709         if (flags & MSG_WAITALL)
1710                 target = size;
1711
1712
1713         /*
1714          * See if there is data ready to read, sleep if there isn't
1715          */
1716         for(;;) {
1717                 DEFINE_WAIT(wait);
1718
1719                 if (sk->sk_err)
1720                         goto out;
1721
1722                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1723                         if (!(flags & MSG_OOB)) {
1724                                 msg->msg_flags |= MSG_OOB;
1725                                 if (!scp->other_report) {
1726                                         scp->other_report = 1;
1727                                         goto out;
1728                                 }
1729                         }
1730                 }
1731
1732                 if (scp->state != DN_RUN)
1733                         goto out;
1734
1735                 if (signal_pending(current)) {
1736                         rv = sock_intr_errno(timeo);
1737                         goto out;
1738                 }
1739
1740                 if (dn_data_ready(sk, queue, flags, target))
1741                         break;
1742
1743                 if (flags & MSG_DONTWAIT) {
1744                         rv = -EWOULDBLOCK;
1745                         goto out;
1746                 }
1747
1748                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1749                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1750                 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1751                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1752                 finish_wait(sk->sk_sleep, &wait);
1753         }
1754
1755         skb_queue_walk_safe(queue, skb, n) {
1756                 unsigned int chunk = skb->len;
1757                 cb = DN_SKB_CB(skb);
1758
1759                 if ((chunk + copied) > size)
1760                         chunk = size - copied;
1761
1762                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1763                         rv = -EFAULT;
1764                         break;
1765                 }
1766                 copied += chunk;
1767
1768                 if (!(flags & MSG_PEEK))
1769                         skb_pull(skb, chunk);
1770
1771                 eor = cb->nsp_flags & 0x40;
1772
1773                 if (skb->len == 0) {
1774                         skb_unlink(skb, queue);
1775                         kfree_skb(skb);
1776                         /*
1777                          * N.B. Don't refer to skb or cb after this point
1778                          * in loop.
1779                          */
1780                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1781                                 scp->flowloc_sw = DN_SEND;
1782                                 dn_nsp_send_link(sk, DN_SEND, 0);
1783                         }
1784                 }
1785
1786                 if (eor) {
1787                         if (sk->sk_type == SOCK_SEQPACKET)
1788                                 break;
1789                         if (!(flags & MSG_WAITALL))
1790                                 break;
1791                 }
1792
1793                 if (flags & MSG_OOB)
1794                         break;
1795
1796                 if (copied >= target)
1797                         break;
1798         }
1799
1800         rv = copied;
1801
1802
1803         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1804                 msg->msg_flags |= MSG_EOR;
1805
1806 out:
1807         if (rv == 0)
1808                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1809
1810         if ((rv >= 0) && msg->msg_name) {
1811                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1812                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1813         }
1814
1815         release_sock(sk);
1816
1817         return rv;
1818 }
1819
1820
1821 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1822 {
1823         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1824         if (skb_queue_len(queue) >= scp->snd_window)
1825                 return 1;
1826         if (fctype != NSP_FC_NONE) {
1827                 if (flags & MSG_OOB) {
1828                         if (scp->flowrem_oth == 0)
1829                                 return 1;
1830                 } else {
1831                         if (scp->flowrem_dat == 0)
1832                                 return 1;
1833                 }
1834         }
1835         return 0;
1836 }
1837
1838 /*
1839  * The DECnet spec requires that the "routing layer" accepts packets which
1840  * are at least 230 bytes in size. This excludes any headers which the NSP
1841  * layer might add, so we always assume that we'll be using the maximal
1842  * length header on data packets. The variation in length is due to the
1843  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1844  * make much practical difference.
1845  */
1846 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1847 {
1848         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1849         if (dev) {
1850                 struct dn_dev *dn_db = dev->dn_ptr;
1851                 mtu -= LL_RESERVED_SPACE(dev);
1852                 if (dn_db->use_long)
1853                         mtu -= 21;
1854                 else
1855                         mtu -= 6;
1856                 mtu -= DN_MAX_NSP_DATA_HEADER;
1857         } else {
1858                 /*
1859                  * 21 = long header, 16 = guess at MAC header length
1860                  */
1861                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1862         }
1863         if (mtu > mss)
1864                 mss = mtu;
1865         return mss;
1866 }
1867
1868 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1869 {
1870         struct dst_entry *dst = __sk_dst_get(sk);
1871         struct dn_scp *scp = DN_SK(sk);
1872         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1873
1874         /* Other data messages are limited to 16 bytes per packet */
1875         if (flags & MSG_OOB)
1876                 return 16;
1877
1878         /* This works out the maximum size of segment we can send out */
1879         if (dst) {
1880                 u32 mtu = dst_mtu(dst);
1881                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1882         }
1883
1884         return mss_now;
1885 }
1886
1887 /*
1888  * N.B. We get the timeout wrong here, but then we always did get it
1889  * wrong before and this is another step along the road to correcting
1890  * it. It ought to get updated each time we pass through the routine,
1891  * but in practise it probably doesn't matter too much for now.
1892  */
1893 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1894                               unsigned long datalen, int noblock,
1895                               int *errcode)
1896 {
1897         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1898                                                    noblock, errcode);
1899         if (skb) {
1900                 skb->protocol = htons(ETH_P_DNA_RT);
1901                 skb->pkt_type = PACKET_OUTGOING;
1902         }
1903         return skb;
1904 }
1905
1906 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1907                       struct msghdr *msg, size_t size)
1908 {
1909         struct sock *sk = sock->sk;
1910         struct dn_scp *scp = DN_SK(sk);
1911         size_t mss;
1912         struct sk_buff_head *queue = &scp->data_xmit_queue;
1913         int flags = msg->msg_flags;
1914         int err = 0;
1915         size_t sent = 0;
1916         int addr_len = msg->msg_namelen;
1917         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1918         struct sk_buff *skb = NULL;
1919         struct dn_skb_cb *cb;
1920         size_t len;
1921         unsigned char fctype;
1922         long timeo;
1923
1924         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1925                 return -EOPNOTSUPP;
1926
1927         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1928                 return -EINVAL;
1929
1930         lock_sock(sk);
1931         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1932         /*
1933          * The only difference between stream sockets and sequenced packet
1934          * sockets is that the stream sockets always behave as if MSG_EOR
1935          * has been set.
1936          */
1937         if (sock->type == SOCK_STREAM) {
1938                 if (flags & MSG_EOR) {
1939                         err = -EINVAL;
1940                         goto out;
1941                 }
1942                 flags |= MSG_EOR;
1943         }
1944
1945
1946         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1947         if (err)
1948                 goto out_err;
1949
1950         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1951                 err = -EPIPE;
1952                 if (!(flags & MSG_NOSIGNAL))
1953                         send_sig(SIGPIPE, current, 0);
1954                 goto out_err;
1955         }
1956
1957         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1958                 dst_negative_advice(&sk->sk_dst_cache);
1959
1960         mss = scp->segsize_rem;
1961         fctype = scp->services_rem & NSP_FC_MASK;
1962
1963         mss = dn_current_mss(sk, flags);
1964
1965         if (flags & MSG_OOB) {
1966                 queue = &scp->other_xmit_queue;
1967                 if (size > mss) {
1968                         err = -EMSGSIZE;
1969                         goto out;
1970                 }
1971         }
1972
1973         scp->persist_fxn = dn_nsp_xmit_timeout;
1974
1975         while(sent < size) {
1976                 err = sock_error(sk);
1977                 if (err)
1978                         goto out;
1979
1980                 if (signal_pending(current)) {
1981                         err = sock_intr_errno(timeo);
1982                         goto out;
1983                 }
1984
1985                 /*
1986                  * Calculate size that we wish to send.
1987                  */
1988                 len = size - sent;
1989
1990                 if (len > mss)
1991                         len = mss;
1992
1993                 /*
1994                  * Wait for queue size to go down below the window
1995                  * size.
1996                  */
1997                 if (dn_queue_too_long(scp, queue, flags)) {
1998                         DEFINE_WAIT(wait);
1999
2000                         if (flags & MSG_DONTWAIT) {
2001                                 err = -EWOULDBLOCK;
2002                                 goto out;
2003                         }
2004
2005                         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
2006                         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2007                         sk_wait_event(sk, &timeo,
2008                                       !dn_queue_too_long(scp, queue, flags));
2009                         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2010                         finish_wait(sk->sk_sleep, &wait);
2011                         continue;
2012                 }
2013
2014                 /*
2015                  * Get a suitably sized skb.
2016                  * 64 is a bit of a hack really, but its larger than any
2017                  * link-layer headers and has served us well as a good
2018                  * guess as to their real length.
2019                  */
2020                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2021                                          flags & MSG_DONTWAIT, &err);
2022
2023                 if (err)
2024                         break;
2025
2026                 if (!skb)
2027                         continue;
2028
2029                 cb = DN_SKB_CB(skb);
2030
2031                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2032
2033                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2034                         err = -EFAULT;
2035                         goto out;
2036                 }
2037
2038                 if (flags & MSG_OOB) {
2039                         cb->nsp_flags = 0x30;
2040                         if (fctype != NSP_FC_NONE)
2041                                 scp->flowrem_oth--;
2042                 } else {
2043                         cb->nsp_flags = 0x00;
2044                         if (scp->seg_total == 0)
2045                                 cb->nsp_flags |= 0x20;
2046
2047                         scp->seg_total += len;
2048
2049                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2050                                 cb->nsp_flags |= 0x40;
2051                                 scp->seg_total = 0;
2052                                 if (fctype == NSP_FC_SCMC)
2053                                         scp->flowrem_dat--;
2054                         }
2055                         if (fctype == NSP_FC_SRC)
2056                                 scp->flowrem_dat--;
2057                 }
2058
2059                 sent += len;
2060                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2061                 skb = NULL;
2062
2063                 scp->persist = dn_nsp_persist(sk);
2064
2065         }
2066 out:
2067
2068         kfree_skb(skb);
2069
2070         release_sock(sk);
2071
2072         return sent ? sent : err;
2073
2074 out_err:
2075         err = sk_stream_error(sk, flags, err);
2076         release_sock(sk);
2077         return err;
2078 }
2079
2080 static int dn_device_event(struct notifier_block *this, unsigned long event,
2081                         void *ptr)
2082 {
2083         struct net_device *dev = (struct net_device *)ptr;
2084
2085         if (!net_eq(dev_net(dev), &init_net))
2086                 return NOTIFY_DONE;
2087
2088         switch(event) {
2089                 case NETDEV_UP:
2090                         dn_dev_up(dev);
2091                         break;
2092                 case NETDEV_DOWN:
2093                         dn_dev_down(dev);
2094                         break;
2095                 default:
2096                         break;
2097         }
2098
2099         return NOTIFY_DONE;
2100 }
2101
2102 static struct notifier_block dn_dev_notifier = {
2103         .notifier_call = dn_device_event,
2104 };
2105
2106 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2107
2108 static struct packet_type dn_dix_packet_type __read_mostly = {
2109         .type =         cpu_to_be16(ETH_P_DNA_RT),
2110         .func =         dn_route_rcv,
2111 };
2112
2113 #ifdef CONFIG_PROC_FS
2114 struct dn_iter_state {
2115         int bucket;
2116 };
2117
2118 static struct sock *dn_socket_get_first(struct seq_file *seq)
2119 {
2120         struct dn_iter_state *state = seq->private;
2121         struct sock *n = NULL;
2122
2123         for(state->bucket = 0;
2124             state->bucket < DN_SK_HASH_SIZE;
2125             ++state->bucket) {
2126                 n = sk_head(&dn_sk_hash[state->bucket]);
2127                 if (n)
2128                         break;
2129         }
2130
2131         return n;
2132 }
2133
2134 static struct sock *dn_socket_get_next(struct seq_file *seq,
2135                                        struct sock *n)
2136 {
2137         struct dn_iter_state *state = seq->private;
2138
2139         n = sk_next(n);
2140 try_again:
2141         if (n)
2142                 goto out;
2143         if (++state->bucket >= DN_SK_HASH_SIZE)
2144                 goto out;
2145         n = sk_head(&dn_sk_hash[state->bucket]);
2146         goto try_again;
2147 out:
2148         return n;
2149 }
2150
2151 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2152 {
2153         struct sock *sk = dn_socket_get_first(seq);
2154
2155         if (sk) {
2156                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2157                         --*pos;
2158         }
2159         return *pos ? NULL : sk;
2160 }
2161
2162 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2163 {
2164         void *rc;
2165         read_lock_bh(&dn_hash_lock);
2166         rc = socket_get_idx(seq, &pos);
2167         if (!rc) {
2168                 read_unlock_bh(&dn_hash_lock);
2169         }
2170         return rc;
2171 }
2172
2173 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2174 {
2175         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2176 }
2177
2178 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2179 {
2180         void *rc;
2181
2182         if (v == SEQ_START_TOKEN) {
2183                 rc = dn_socket_get_idx(seq, 0);
2184                 goto out;
2185         }
2186
2187         rc = dn_socket_get_next(seq, v);
2188         if (rc)
2189                 goto out;
2190         read_unlock_bh(&dn_hash_lock);
2191 out:
2192         ++*pos;
2193         return rc;
2194 }
2195
2196 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2197 {
2198         if (v && v != SEQ_START_TOKEN)
2199                 read_unlock_bh(&dn_hash_lock);
2200 }
2201
2202 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2203
2204 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2205 {
2206         int i;
2207
2208         switch (le16_to_cpu(dn->sdn_objnamel)) {
2209                 case 0:
2210                         sprintf(buf, "%d", dn->sdn_objnum);
2211                         break;
2212                 default:
2213                         for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2214                                 buf[i] = dn->sdn_objname[i];
2215                                 if (IS_NOT_PRINTABLE(buf[i]))
2216                                         buf[i] = '.';
2217                         }
2218                         buf[i] = 0;
2219         }
2220 }
2221
2222 static char *dn_state2asc(unsigned char state)
2223 {
2224         switch(state) {
2225                 case DN_O:
2226                         return "OPEN";
2227                 case DN_CR:
2228                         return "  CR";
2229                 case DN_DR:
2230                         return "  DR";
2231                 case DN_DRC:
2232                         return " DRC";
2233                 case DN_CC:
2234                         return "  CC";
2235                 case DN_CI:
2236                         return "  CI";
2237                 case DN_NR:
2238                         return "  NR";
2239                 case DN_NC:
2240                         return "  NC";
2241                 case DN_CD:
2242                         return "  CD";
2243                 case DN_RJ:
2244                         return "  RJ";
2245                 case DN_RUN:
2246                         return " RUN";
2247                 case DN_DI:
2248                         return "  DI";
2249                 case DN_DIC:
2250                         return " DIC";
2251                 case DN_DN:
2252                         return "  DN";
2253                 case DN_CL:
2254                         return "  CL";
2255                 case DN_CN:
2256                         return "  CN";
2257         }
2258
2259         return "????";
2260 }
2261
2262 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2263 {
2264         struct dn_scp *scp = DN_SK(sk);
2265         char buf1[DN_ASCBUF_LEN];
2266         char buf2[DN_ASCBUF_LEN];
2267         char local_object[DN_MAXOBJL+3];
2268         char remote_object[DN_MAXOBJL+3];
2269
2270         dn_printable_object(&scp->addr, local_object);
2271         dn_printable_object(&scp->peer, remote_object);
2272
2273         seq_printf(seq,
2274                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2275                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2276                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2277                    scp->addrloc,
2278                    scp->numdat,
2279                    scp->numoth,
2280                    scp->ackxmt_dat,
2281                    scp->ackxmt_oth,
2282                    scp->flowloc_sw,
2283                    local_object,
2284                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2285                    scp->addrrem,
2286                    scp->numdat_rcv,
2287                    scp->numoth_rcv,
2288                    scp->ackrcv_dat,
2289                    scp->ackrcv_oth,
2290                    scp->flowrem_sw,
2291                    remote_object,
2292                    dn_state2asc(scp->state),
2293                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2294 }
2295
2296 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2297 {
2298         if (v == SEQ_START_TOKEN) {
2299                 seq_puts(seq, "Local                                              Remote\n");
2300         } else {
2301                 dn_socket_format_entry(seq, v);
2302         }
2303         return 0;
2304 }
2305
2306 static const struct seq_operations dn_socket_seq_ops = {
2307         .start  = dn_socket_seq_start,
2308         .next   = dn_socket_seq_next,
2309         .stop   = dn_socket_seq_stop,
2310         .show   = dn_socket_seq_show,
2311 };
2312
2313 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2314 {
2315         return seq_open_private(file, &dn_socket_seq_ops,
2316                         sizeof(struct dn_iter_state));
2317 }
2318
2319 static const struct file_operations dn_socket_seq_fops = {
2320         .owner          = THIS_MODULE,
2321         .open           = dn_socket_seq_open,
2322         .read           = seq_read,
2323         .llseek         = seq_lseek,
2324         .release        = seq_release_private,
2325 };
2326 #endif
2327
2328 static struct net_proto_family  dn_family_ops = {
2329         .family =       AF_DECnet,
2330         .create =       dn_create,
2331         .owner  =       THIS_MODULE,
2332 };
2333
2334 static const struct proto_ops dn_proto_ops = {
2335         .family =       AF_DECnet,
2336         .owner =        THIS_MODULE,
2337         .release =      dn_release,
2338         .bind =         dn_bind,
2339         .connect =      dn_connect,
2340         .socketpair =   sock_no_socketpair,
2341         .accept =       dn_accept,
2342         .getname =      dn_getname,
2343         .poll =         dn_poll,
2344         .ioctl =        dn_ioctl,
2345         .listen =       dn_listen,
2346         .shutdown =     dn_shutdown,
2347         .setsockopt =   dn_setsockopt,
2348         .getsockopt =   dn_getsockopt,
2349         .sendmsg =      dn_sendmsg,
2350         .recvmsg =      dn_recvmsg,
2351         .mmap =         sock_no_mmap,
2352         .sendpage =     sock_no_sendpage,
2353 };
2354
2355 void dn_register_sysctl(void);
2356 void dn_unregister_sysctl(void);
2357
2358 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2359 MODULE_AUTHOR("Linux DECnet Project Team");
2360 MODULE_LICENSE("GPL");
2361 MODULE_ALIAS_NETPROTO(PF_DECnet);
2362
2363 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2364
2365 static int __init decnet_init(void)
2366 {
2367         int rc;
2368
2369         printk(banner);
2370
2371         rc = proto_register(&dn_proto, 1);
2372         if (rc != 0)
2373                 goto out;
2374
2375         dn_neigh_init();
2376         dn_dev_init();
2377         dn_route_init();
2378         dn_fib_init();
2379
2380         sock_register(&dn_family_ops);
2381         dev_add_pack(&dn_dix_packet_type);
2382         register_netdevice_notifier(&dn_dev_notifier);
2383
2384         proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
2385         dn_register_sysctl();
2386 out:
2387         return rc;
2388
2389 }
2390 module_init(decnet_init);
2391
2392 /*
2393  * Prevent DECnet module unloading until its fixed properly.
2394  * Requires an audit of the code to check for memory leaks and
2395  * initialisation problems etc.
2396  */
2397 #if 0
2398 static void __exit decnet_exit(void)
2399 {
2400         sock_unregister(AF_DECnet);
2401         rtnl_unregister_all(PF_DECnet);
2402         dev_remove_pack(&dn_dix_packet_type);
2403
2404         dn_unregister_sysctl();
2405
2406         unregister_netdevice_notifier(&dn_dev_notifier);
2407
2408         dn_route_cleanup();
2409         dn_dev_cleanup();
2410         dn_neigh_cleanup();
2411         dn_fib_cleanup();
2412
2413         proc_net_remove(&init_net, "decnet");
2414
2415         proto_unregister(&dn_proto);
2416
2417         rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2418 }
2419 module_exit(decnet_exit);
2420 #endif