net/decnet/af_decnet.c

   1
   2 /*
   3  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   4  *              operating system.  DECnet is implemented using the  BSD Socket
   5  *              interface as the means of communication with the user level.
   6  *
   7  *              DECnet Socket Layer Interface
   8  *
   9  * Authors:     Eduardo Marcelo Serrat <emserrat@geocities.com>
  10  *              Patrick Caulfield <patrick@pandh.demon.co.uk>
  11  *
  12  * Changes:
  13  *        Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
  14  *                          version of the code. Original copyright preserved
  15  *                          below.
  16  *        Steve Whitehouse: Some bug fixes, cleaning up some code to make it
  17  *                          compatible with my routing layer.
  18  *        Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
  19  *                          Caulfield.
  20  *        Steve Whitehouse: Further bug fixes, checking module code still works
  21  *                          with new routing layer.
  22  *        Steve Whitehouse: Additional set/get_sockopt() calls.
  23  *        Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
  24  *                          code.
  25  *        Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
  26  *                          way. Didn't manage it entirely, but its better.
  27  *        Steve Whitehouse: ditto for sendmsg().
  28  *        Steve Whitehouse: A selection of bug fixes to various things.
  29  *        Steve Whitehouse: Added TIOCOUTQ ioctl.
  30  *        Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
  31  *        Steve Whitehouse: Fixes to connect() error returns.
  32  *       Patrick Caulfield: Fixes to delayed acceptance logic.
  33  *         David S. Miller: New socket locking
  34  *        Steve Whitehouse: Socket list hashing/locking
  35  *         Arnaldo C. Melo: use capable, not suser
  36  *        Steve Whitehouse: Removed unused code. Fix to use sk->allocation
  37  *                          when required.
  38  *       Patrick Caulfield: /proc/net/decnet now has object name/number
  39  *        Steve Whitehouse: Fixed local port allocation, hashed sk list
  40  *          Matthew Wilcox: Fixes for dn_ioctl()
  41  *        Steve Whitehouse: New connect/accept logic to allow timeouts and
  42  *                          prepare for sendpage etc.
  43  */
  44
  45
  46 /******************************************************************************
  47     (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
  48
  49     This program is free software; you can redistribute it and/or modify
  50     it under the terms of the GNU General Public License as published by
  51     the Free Software Foundation; either version 2 of the License, or
  52     any later version.
  53
  54     This program is distributed in the hope that it will be useful,
  55     but WITHOUT ANY WARRANTY; without even the implied warranty of
  56     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  57     GNU General Public License for more details.
  58
  59 HISTORY:
  60
  61 Version           Kernel     Date       Author/Comments
  62 -------           ------     ----       ---------------
  63 Version 0.0.1     2.0.30    01-dic-97   Eduardo Marcelo Serrat
  64                                         (emserrat@geocities.com)
  65
  66                                         First Development of DECnet Socket La-
  67                                         yer for Linux. Only supports outgoing
  68                                         connections.
  69
  70 Version 0.0.2     2.1.105   20-jun-98   Patrick J. Caulfield
  71                                         (patrick@pandh.demon.co.uk)
  72
  73                                         Port to new kernel development version.
  74
  75 Version 0.0.3     2.1.106   25-jun-98   Eduardo Marcelo Serrat
  76                                         (emserrat@geocities.com)
  77                                         _
  78                                         Added support for incoming connections
  79                                         so we can start developing server apps
  80                                         on Linux.
  81                                         -
  82                                         Module Support
  83 Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
  84                                        (emserrat@geocities.com)
  85                                        _
  86                                         Added support for X11R6.4. Now we can
  87                                         use DECnet transport for X on Linux!!!
  88                                        -
  89 Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
  90                                        (emserrat@geocities.com)
  91                                        Removed bugs on flow control
  92                                        Removed bugs on incoming accessdata
  93                                        order
  94                                        -
  95 Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
  96                                        dn_recvmsg fixes
  97
  98                                         Patrick J. Caulfield
  99                                        dn_bind fixes
 100 *******************************************************************************/
 101
 102 #include <linux/module.h>
 103 #include <linux/errno.h>
 104 #include <linux/types.h>
 105 #include <linux/slab.h>
 106 #include <linux/socket.h>
 107 #include <linux/in.h>
 108 #include <linux/kernel.h>
 109 #include <linux/sched.h>
 110 #include <linux/timer.h>
 111 #include <linux/string.h>
 112 #include <linux/sockios.h>
 113 #include <linux/net.h>
 114 #include <linux/netdevice.h>
 115 #include <linux/inet.h>
 116 #include <linux/route.h>
 117 #include <linux/netfilter.h>
 118 #include <linux/seq_file.h>
 119 #include <net/sock.h>
 120 #include <net/tcp_states.h>
 121 #include <net/flow.h>
 122 #include <asm/system.h>
 123 #include <asm/ioctls.h>
 124 #include <linux/capability.h>
 125 #include <linux/mm.h>
 126 #include <linux/interrupt.h>
 127 #include <linux/proc_fs.h>
 128 #include <linux/stat.h>
 129 #include <linux/init.h>
 130 #include <linux/poll.h>
 131 #include <net/net_namespace.h>
 132 #include <net/neighbour.h>
 133 #include <net/dst.h>
 134 #include <net/fib_rules.h>
 135 #include <net/dn.h>
 136 #include <net/dn_nsp.h>
 137 #include <net/dn_dev.h>
 138 #include <net/dn_route.h>
 139 #include <net/dn_fib.h>
 140 #include <net/dn_neigh.h>
 141
 142 struct dn_sock {
 143         struct sock sk;
 144         struct dn_scp scp;
 145 };
 146
 147 static void dn_keepalive(struct sock *sk);
 148
 149 #define DN_SK_HASH_SHIFT 8
 150 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
 151 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
 152
 153
 154 static const struct proto_ops dn_proto_ops;
 155 static DEFINE_RWLOCK(dn_hash_lock);
 156 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 157 static struct hlist_head dn_wild_sk;
 158 static atomic_t decnet_memory_allocated;
 159
 160 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
 161 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 162
 163 static struct hlist_head *dn_find_list(struct sock *sk)
 164 {
 165         struct dn_scp *scp = DN_SK(sk);
 166
 167         if (scp->addr.sdn_flags & SDF_WILD)
 168                 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
 169
 170         return &dn_sk_hash[dn_ntohs(scp->addrloc) & DN_SK_HASH_MASK];
 171 }
 172
 173 /*
 174  * Valid ports are those greater than zero and not already in use.
 175  */
 176 static int check_port(__le16 port)
 177 {
 178         struct sock *sk;
 179         struct hlist_node *node;
 180
 181         if (port == 0)
 182                 return -1;
 183
 184         sk_for_each(sk, node, &dn_sk_hash[dn_ntohs(port) & DN_SK_HASH_MASK]) {
 185                 struct dn_scp *scp = DN_SK(sk);
 186                 if (scp->addrloc == port)
 187                         return -1;
 188         }
 189         return 0;
 190 }
 191
 192 static unsigned short port_alloc(struct sock *sk)
 193 {
 194         struct dn_scp *scp = DN_SK(sk);
 195 static unsigned short port = 0x2000;
 196         unsigned short i_port = port;
 197
 198         while(check_port(dn_htons(++port)) != 0) {
 199                 if (port == i_port)
 200                         return 0;
 201         }
 202
 203         scp->addrloc = dn_htons(port);
 204
 205         return 1;
 206 }
 207
 208 /*
 209  * Since this is only ever called from user
 210  * level, we don't need a write_lock() version
 211  * of this.
 212  */
 213 static int dn_hash_sock(struct sock *sk)
 214 {
 215         struct dn_scp *scp = DN_SK(sk);
 216         struct hlist_head *list;
 217         int rv = -EUSERS;
 218
 219         BUG_ON(sk_hashed(sk));
 220
 221         write_lock_bh(&dn_hash_lock);
 222
 223         if (!scp->addrloc && !port_alloc(sk))
 224                 goto out;
 225
 226         rv = -EADDRINUSE;
 227         if ((list = dn_find_list(sk)) == NULL)
 228                 goto out;
 229
 230         sk_add_node(sk, list);
 231         rv = 0;
 232 out:
 233         write_unlock_bh(&dn_hash_lock);
 234         return rv;
 235 }
 236
 237 static void dn_unhash_sock(struct sock *sk)
 238 {
 239         write_lock(&dn_hash_lock);
 240         sk_del_node_init(sk);
 241         write_unlock(&dn_hash_lock);
 242 }
 243
 244 static void dn_unhash_sock_bh(struct sock *sk)
 245 {
 246         write_lock_bh(&dn_hash_lock);
 247         sk_del_node_init(sk);
 248         write_unlock_bh(&dn_hash_lock);
 249 }
 250
 251 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
 252 {
 253         int i;
 254         unsigned hash = addr->sdn_objnum;
 255
 256         if (hash == 0) {
 257                 hash = addr->sdn_objnamel;
 258                 for(i = 0; i < dn_ntohs(addr->sdn_objnamel); i++) {
 259                         hash ^= addr->sdn_objname[i];
 260                         hash ^= (hash << 3);
 261                 }
 262         }
 263
 264         return &dn_sk_hash[hash & DN_SK_HASH_MASK];
 265 }
 266
 267 /*
 268  * Called to transform a socket from bound (i.e. with a local address)
 269  * into a listening socket (doesn't need a local port number) and rehashes
 270  * based upon the object name/number.
 271  */
 272 static void dn_rehash_sock(struct sock *sk)
 273 {
 274         struct hlist_head *list;
 275         struct dn_scp *scp = DN_SK(sk);
 276
 277         if (scp->addr.sdn_flags & SDF_WILD)
 278                 return;
 279
 280         write_lock_bh(&dn_hash_lock);
 281         sk_del_node_init(sk);
 282         DN_SK(sk)->addrloc = 0;
 283         list = listen_hash(&DN_SK(sk)->addr);
 284         sk_add_node(sk, list);
 285         write_unlock_bh(&dn_hash_lock);
 286 }
 287
 288 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
 289 {
 290         int len = 2;
 291
 292         *buf++ = type;
 293
 294         switch(type) {
 295                 case 0:
 296                         *buf++ = sdn->sdn_objnum;
 297                         break;
 298                 case 1:
 299                         *buf++ = 0;
 300                         *buf++ = dn_ntohs(sdn->sdn_objnamel);
 301                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
 302                         len = 3 + dn_ntohs(sdn->sdn_objnamel);
 303                         break;
 304                 case 2:
 305                         memset(buf, 0, 5);
 306                         buf += 5;
 307                         *buf++ = dn_ntohs(sdn->sdn_objnamel);
 308                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
 309                         len = 7 + dn_ntohs(sdn->sdn_objnamel);
 310                         break;
 311         }
 312
 313         return len;
 314 }
 315
 316 /*
 317  * On reception of usernames, we handle types 1 and 0 for destination
 318  * addresses only. Types 2 and 4 are used for source addresses, but the
 319  * UIC, GIC are ignored and they are both treated the same way. Type 3
 320  * is never used as I've no idea what its purpose might be or what its
 321  * format is.
 322  */
 323 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
 324 {
 325         unsigned char type;
 326         int size = len;
 327         int namel = 12;
 328
 329         sdn->sdn_objnum = 0;
 330         sdn->sdn_objnamel = dn_htons(0);
 331         memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 332
 333         if (len < 2)
 334                 return -1;
 335
 336         len -= 2;
 337         *fmt = *data++;
 338         type = *data++;
 339
 340         switch(*fmt) {
 341                 case 0:
 342                         sdn->sdn_objnum = type;
 343                         return 2;
 344                 case 1:
 345                         namel = 16;
 346                         break;
 347                 case 2:
 348                         len  -= 4;
 349                         data += 4;
 350                         break;
 351                 case 4:
 352                         len  -= 8;
 353                         data += 8;
 354                         break;
 355                 default:
 356                         return -1;
 357         }
 358
 359         len -= 1;
 360
 361         if (len < 0)
 362                 return -1;
 363
 364         sdn->sdn_objnamel = dn_htons(*data++);
 365         len -= dn_ntohs(sdn->sdn_objnamel);
 366
 367         if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
 368                 return -1;
 369
 370         memcpy(sdn->sdn_objname, data, dn_ntohs(sdn->sdn_objnamel));
 371
 372         return size - len;
 373 }
 374
 375 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
 376 {
 377         struct hlist_head *list = listen_hash(addr);
 378         struct hlist_node *node;
 379         struct sock *sk;
 380
 381         read_lock(&dn_hash_lock);
 382         sk_for_each(sk, node, list) {
 383                 struct dn_scp *scp = DN_SK(sk);
 384                 if (sk->sk_state != TCP_LISTEN)
 385                         continue;
 386                 if (scp->addr.sdn_objnum) {
 387                         if (scp->addr.sdn_objnum != addr->sdn_objnum)
 388                                 continue;
 389                 } else {
 390                         if (addr->sdn_objnum)
 391                                 continue;
 392                         if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 393                                 continue;
 394                         if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
 395                                 continue;
 396                 }
 397                 sock_hold(sk);
 398                 read_unlock(&dn_hash_lock);
 399                 return sk;
 400         }
 401
 402         sk = sk_head(&dn_wild_sk);
 403         if (sk) {
 404                 if (sk->sk_state == TCP_LISTEN)
 405                         sock_hold(sk);
 406                 else
 407                         sk = NULL;
 408         }
 409
 410         read_unlock(&dn_hash_lock);
 411         return sk;
 412 }
 413
 414 struct sock *dn_find_by_skb(struct sk_buff *skb)
 415 {
 416         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 417         struct sock *sk;
 418         struct hlist_node *node;
 419         struct dn_scp *scp;
 420
 421         read_lock(&dn_hash_lock);
 422         sk_for_each(sk, node, &dn_sk_hash[dn_ntohs(cb->dst_port) & DN_SK_HASH_MASK]) {
 423                 scp = DN_SK(sk);
 424                 if (cb->src != dn_saddr2dn(&scp->peer))
 425                         continue;
 426                 if (cb->dst_port != scp->addrloc)
 427                         continue;
 428                 if (scp->addrrem && (cb->src_port != scp->addrrem))
 429                         continue;
 430                 sock_hold(sk);
 431                 goto found;
 432         }
 433         sk = NULL;
 434 found:
 435         read_unlock(&dn_hash_lock);
 436         return sk;
 437 }
 438
 439
 440
 441 static void dn_destruct(struct sock *sk)
 442 {
 443         struct dn_scp *scp = DN_SK(sk);
 444
 445         skb_queue_purge(&scp->data_xmit_queue);
 446         skb_queue_purge(&scp->other_xmit_queue);
 447         skb_queue_purge(&scp->other_receive_queue);
 448
 449         dst_release(xchg(&sk->sk_dst_cache, NULL));
 450 }
 451
 452 static int dn_memory_pressure;
 453
 454 static void dn_enter_memory_pressure(void)
 455 {
 456         if (!dn_memory_pressure) {
 457                 dn_memory_pressure = 1;
 458         }
 459 }
 460
 461 static struct proto dn_proto = {
 462         .name                   = "NSP",
 463         .owner                  = THIS_MODULE,
 464         .enter_memory_pressure  = dn_enter_memory_pressure,
 465         .memory_pressure        = &dn_memory_pressure,
 466         .memory_allocated       = &decnet_memory_allocated,
 467         .sysctl_mem             = sysctl_decnet_mem,
 468         .sysctl_wmem            = sysctl_decnet_wmem,
 469         .sysctl_rmem            = sysctl_decnet_rmem,
 470         .max_header             = DN_MAX_NSP_DATA_HEADER + 64,
 471         .obj_size               = sizeof(struct dn_sock),
 472 };
 473
 474 static struct sock *dn_alloc_sock(struct socket *sock, gfp_t gfp)
 475 {
 476         struct dn_scp *scp;
 477         struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
 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 socket *sock, int protocol)
 679 {
 680         struct sock *sk;
 681
 682         switch(sock->type) {
 683                 case SOCK_SEQPACKET:
 684                         if (protocol != DNPROTO_NSP)
 685                                 return -EPROTONOSUPPORT;
 686                         break;
 687                 case SOCK_STREAM:
 688                         break;
 689                 default:
 690                         return -ESOCKTNOSUPPORT;
 691         }
 692
 693
 694         if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
 695                 return -ENOBUFS;
 696
 697         sk->sk_protocol = protocol;
 698
 699         return 0;
 700 }
 701
 702
 703 static int
 704 dn_release(struct socket *sock)
 705 {
 706         struct sock *sk = sock->sk;
 707
 708         if (sk) {
 709                 sock_orphan(sk);
 710                 sock_hold(sk);
 711                 lock_sock(sk);
 712                 dn_destroy_sock(sk);
 713                 release_sock(sk);
 714                 sock_put(sk);
 715         }
 716
 717         return 0;
 718 }
 719
 720 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 721 {
 722         struct sock *sk = sock->sk;
 723         struct dn_scp *scp = DN_SK(sk);
 724         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 725         struct net_device *dev, *ldev;
 726         int rv;
 727
 728         if (addr_len != sizeof(struct sockaddr_dn))
 729                 return -EINVAL;
 730
 731         if (saddr->sdn_family != AF_DECnet)
 732                 return -EINVAL;
 733
 734         if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
 735                 return -EINVAL;
 736
 737         if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
 738                 return -EINVAL;
 739
 740         if (saddr->sdn_flags & ~SDF_WILD)
 741                 return -EINVAL;
 742
 743         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 744             (saddr->sdn_flags & SDF_WILD)))
 745                 return -EACCES;
 746
 747         if (!(saddr->sdn_flags & SDF_WILD)) {
 748                 if (dn_ntohs(saddr->sdn_nodeaddrl)) {
 749                         read_lock(&dev_base_lock);
 750                         ldev = NULL;
 751                         for_each_netdev(dev) {
 752                                 if (!dev->dn_ptr)
 753                                         continue;
 754                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 755                                         ldev = dev;
 756                                         break;
 757                                 }
 758                         }
 759                         read_unlock(&dev_base_lock);
 760                         if (ldev == NULL)
 761                                 return -EADDRNOTAVAIL;
 762                 }
 763         }
 764
 765         rv = -EINVAL;
 766         lock_sock(sk);
 767         if (sock_flag(sk, SOCK_ZAPPED)) {
 768                 memcpy(&scp->addr, saddr, addr_len);
 769                 sock_reset_flag(sk, SOCK_ZAPPED);
 770
 771                 rv = dn_hash_sock(sk);
 772                 if (rv)
 773                         sock_set_flag(sk, SOCK_ZAPPED);
 774         }
 775         release_sock(sk);
 776
 777         return rv;
 778 }
 779
 780
 781 static int dn_auto_bind(struct socket *sock)
 782 {
 783         struct sock *sk = sock->sk;
 784         struct dn_scp *scp = DN_SK(sk);
 785         int rv;
 786
 787         sock_reset_flag(sk, SOCK_ZAPPED);
 788
 789         scp->addr.sdn_flags  = 0;
 790         scp->addr.sdn_objnum = 0;
 791
 792         /*
 793          * This stuff is to keep compatibility with Eduardo's
 794          * patch. I hope I can dispense with it shortly...
 795          */
 796         if ((scp->accessdata.acc_accl != 0) &&
 797                 (scp->accessdata.acc_accl <= 12)) {
 798
 799                 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
 800                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
 801
 802                 scp->accessdata.acc_accl = 0;
 803                 memset(scp->accessdata.acc_acc, 0, 40);
 804         }
 805         /* End of compatibility stuff */
 806
 807         scp->addr.sdn_add.a_len = dn_htons(2);
 808         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 809         if (rv == 0) {
 810                 rv = dn_hash_sock(sk);
 811                 if (rv)
 812                         sock_set_flag(sk, SOCK_ZAPPED);
 813         }
 814
 815         return rv;
 816 }
 817
 818 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 819 {
 820         struct dn_scp *scp = DN_SK(sk);
 821         DEFINE_WAIT(wait);
 822         int err;
 823
 824         if (scp->state != DN_CR)
 825                 return -EINVAL;
 826
 827         scp->state = DN_CC;
 828         scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
 829         dn_send_conn_conf(sk, allocation);
 830
 831         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 832         for(;;) {
 833                 release_sock(sk);
 834                 if (scp->state == DN_CC)
 835                         *timeo = schedule_timeout(*timeo);
 836                 lock_sock(sk);
 837                 err = 0;
 838                 if (scp->state == DN_RUN)
 839                         break;
 840                 err = sock_error(sk);
 841                 if (err)
 842                         break;
 843                 err = sock_intr_errno(*timeo);
 844                 if (signal_pending(current))
 845                         break;
 846                 err = -EAGAIN;
 847                 if (!*timeo)
 848                         break;
 849                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 850         }
 851         finish_wait(sk->sk_sleep, &wait);
 852         if (err == 0) {
 853                 sk->sk_socket->state = SS_CONNECTED;
 854         } else if (scp->state != DN_CC) {
 855                 sk->sk_socket->state = SS_UNCONNECTED;
 856         }
 857         return err;
 858 }
 859
 860 static int dn_wait_run(struct sock *sk, long *timeo)
 861 {
 862         struct dn_scp *scp = DN_SK(sk);
 863         DEFINE_WAIT(wait);
 864         int err = 0;
 865
 866         if (scp->state == DN_RUN)
 867                 goto out;
 868
 869         if (!*timeo)
 870                 return -EALREADY;
 871
 872         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 873         for(;;) {
 874                 release_sock(sk);
 875                 if (scp->state == DN_CI || scp->state == DN_CC)
 876                         *timeo = schedule_timeout(*timeo);
 877                 lock_sock(sk);
 878                 err = 0;
 879                 if (scp->state == DN_RUN)
 880                         break;
 881                 err = sock_error(sk);
 882                 if (err)
 883                         break;
 884                 err = sock_intr_errno(*timeo);
 885                 if (signal_pending(current))
 886                         break;
 887                 err = -ETIMEDOUT;
 888                 if (!*timeo)
 889                         break;
 890                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 891         }
 892         finish_wait(sk->sk_sleep, &wait);
 893 out:
 894         if (err == 0) {
 895                 sk->sk_socket->state = SS_CONNECTED;
 896         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 897                 sk->sk_socket->state = SS_UNCONNECTED;
 898         }
 899         return err;
 900 }
 901
 902 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 903 {
 904         struct socket *sock = sk->sk_socket;
 905         struct dn_scp *scp = DN_SK(sk);
 906         int err = -EISCONN;
 907         struct flowi fl;
 908
 909         if (sock->state == SS_CONNECTED)
 910                 goto out;
 911
 912         if (sock->state == SS_CONNECTING) {
 913                 err = 0;
 914                 if (scp->state == DN_RUN) {
 915                         sock->state = SS_CONNECTED;
 916                         goto out;
 917                 }
 918                 err = -ECONNREFUSED;
 919                 if (scp->state != DN_CI && scp->state != DN_CC) {
 920                         sock->state = SS_UNCONNECTED;
 921                         goto out;
 922                 }
 923                 return dn_wait_run(sk, timeo);
 924         }
 925
 926         err = -EINVAL;
 927         if (scp->state != DN_O)
 928                 goto out;
 929
 930         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 931                 goto out;
 932         if (addr->sdn_family != AF_DECnet)
 933                 goto out;
 934         if (addr->sdn_flags & SDF_WILD)
 935                 goto out;
 936
 937         if (sock_flag(sk, SOCK_ZAPPED)) {
 938                 err = dn_auto_bind(sk->sk_socket);
 939                 if (err)
 940                         goto out;
 941         }
 942
 943         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 944
 945         err = -EHOSTUNREACH;
 946         memset(&fl, 0, sizeof(fl));
 947         fl.oif = sk->sk_bound_dev_if;
 948         fl.fld_dst = dn_saddr2dn(&scp->peer);
 949         fl.fld_src = dn_saddr2dn(&scp->addr);
 950         dn_sk_ports_copy(&fl, scp);
 951         fl.proto = DNPROTO_NSP;
 952         if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
 953                 goto out;
 954         sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 955         sock->state = SS_CONNECTING;
 956         scp->state = DN_CI;
 957         scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
 958
 959         dn_nsp_send_conninit(sk, NSP_CI);
 960         err = -EINPROGRESS;
 961         if (*timeo) {
 962                 err = dn_wait_run(sk, timeo);
 963         }
 964 out:
 965         return err;
 966 }
 967
 968 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 969 {
 970         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 971         struct sock *sk = sock->sk;
 972         int err;
 973         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 974
 975         lock_sock(sk);
 976         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 977         release_sock(sk);
 978
 979         return err;
 980 }
 981
 982 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 983 {
 984         struct dn_scp *scp = DN_SK(sk);
 985
 986         switch(scp->state) {
 987                 case DN_RUN:
 988                         return 0;
 989                 case DN_CR:
 990                         return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 991                 case DN_CI:
 992                 case DN_CC:
 993                         return dn_wait_run(sk, timeo);
 994                 case DN_O:
 995                         return __dn_connect(sk, addr, addrlen, timeo, flags);
 996         }
 997
 998         return -EINVAL;
 999 }
1000
1001
1002 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1003 {
1004         unsigned char *ptr = skb->data;
1005
1006         acc->acc_userl = *ptr++;
1007         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1008         ptr += acc->acc_userl;
1009
1010         acc->acc_passl = *ptr++;
1011         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1012         ptr += acc->acc_passl;
1013
1014         acc->acc_accl = *ptr++;
1015         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1016
1017         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1018
1019 }
1020
1021 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1022 {
1023         unsigned char *ptr = skb->data;
1024         u16 len = *ptr++; /* yes, it's 8bit on the wire */
1025
1026         BUG_ON(len > 16); /* we've checked the contents earlier */
1027         opt->opt_optl   = dn_htons(len);
1028         opt->opt_status = 0;
1029         memcpy(opt->opt_data, ptr, len);
1030         skb_pull(skb, len + 1);
1031 }
1032
1033 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1034 {
1035         DEFINE_WAIT(wait);
1036         struct sk_buff *skb = NULL;
1037         int err = 0;
1038
1039         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1040         for(;;) {
1041                 release_sock(sk);
1042                 skb = skb_dequeue(&sk->sk_receive_queue);
1043                 if (skb == NULL) {
1044                         *timeo = schedule_timeout(*timeo);
1045                         skb = skb_dequeue(&sk->sk_receive_queue);
1046                 }
1047                 lock_sock(sk);
1048                 if (skb != NULL)
1049                         break;
1050                 err = -EINVAL;
1051                 if (sk->sk_state != TCP_LISTEN)
1052                         break;
1053                 err = sock_intr_errno(*timeo);
1054                 if (signal_pending(current))
1055                         break;
1056                 err = -EAGAIN;
1057                 if (!*timeo)
1058                         break;
1059                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1060         }
1061         finish_wait(sk->sk_sleep, &wait);
1062
1063         return skb == NULL ? ERR_PTR(err) : skb;
1064 }
1065
1066 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1067 {
1068         struct sock *sk = sock->sk, *newsk;
1069         struct sk_buff *skb = NULL;
1070         struct dn_skb_cb *cb;
1071         unsigned char menuver;
1072         int err = 0;
1073         unsigned char type;
1074         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1075
1076         lock_sock(sk);
1077
1078         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1079                 release_sock(sk);
1080                 return -EINVAL;
1081         }
1082
1083         skb = skb_dequeue(&sk->sk_receive_queue);
1084         if (skb == NULL) {
1085                 skb = dn_wait_for_connect(sk, &timeo);
1086                 if (IS_ERR(skb)) {
1087                         release_sock(sk);
1088                         return PTR_ERR(skb);
1089                 }
1090         }
1091
1092         cb = DN_SKB_CB(skb);
1093         sk->sk_ack_backlog--;
1094         newsk = dn_alloc_sock(newsock, sk->sk_allocation);
1095         if (newsk == NULL) {
1096                 release_sock(sk);
1097                 kfree_skb(skb);
1098                 return -ENOBUFS;
1099         }
1100         release_sock(sk);
1101
1102         dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1103         skb->dst = NULL;
1104
1105         DN_SK(newsk)->state        = DN_CR;
1106         DN_SK(newsk)->addrrem      = cb->src_port;
1107         DN_SK(newsk)->services_rem = cb->services;
1108         DN_SK(newsk)->info_rem     = cb->info;
1109         DN_SK(newsk)->segsize_rem  = cb->segsize;
1110         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1111
1112         if (DN_SK(newsk)->segsize_rem < 230)
1113                 DN_SK(newsk)->segsize_rem = 230;
1114
1115         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1116                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1117
1118         newsk->sk_state  = TCP_LISTEN;
1119         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1120
1121         /*
1122          * If we are listening on a wild socket, we don't want
1123          * the newly created socket on the wrong hash queue.
1124          */
1125         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1126
1127         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1128         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1129         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1130         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1131
1132         menuver = *skb->data;
1133         skb_pull(skb, 1);
1134
1135         if (menuver & DN_MENUVER_ACC)
1136                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1137
1138         if (menuver & DN_MENUVER_USR)
1139                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1140
1141         if (menuver & DN_MENUVER_PRX)
1142                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1143
1144         if (menuver & DN_MENUVER_UIC)
1145                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1146
1147         kfree_skb(skb);
1148
1149         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1150                 sizeof(struct optdata_dn));
1151         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1152                 sizeof(struct optdata_dn));
1153
1154         lock_sock(newsk);
1155         err = dn_hash_sock(newsk);
1156         if (err == 0) {
1157                 sock_reset_flag(newsk, SOCK_ZAPPED);
1158                 dn_send_conn_ack(newsk);
1159
1160                 /*
1161                  * Here we use sk->sk_allocation since although the conn conf is
1162                  * for the newsk, the context is the old socket.
1163                  */
1164                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1165                         err = dn_confirm_accept(newsk, &timeo,
1166                                                 sk->sk_allocation);
1167         }
1168         release_sock(newsk);
1169         return err;
1170 }
1171
1172
1173 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1174 {
1175         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1176         struct sock *sk = sock->sk;
1177         struct dn_scp *scp = DN_SK(sk);
1178
1179         *uaddr_len = sizeof(struct sockaddr_dn);
1180
1181         lock_sock(sk);
1182
1183         if (peer) {
1184                 if ((sock->state != SS_CONNECTED &&
1185                      sock->state != SS_CONNECTING) &&
1186                     scp->accept_mode == ACC_IMMED) {
1187                         release_sock(sk);
1188                         return -ENOTCONN;
1189                 }
1190
1191                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1192         } else {
1193                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1194         }
1195
1196         release_sock(sk);
1197
1198         return 0;
1199 }
1200
1201
1202 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1203 {
1204         struct sock *sk = sock->sk;
1205         struct dn_scp *scp = DN_SK(sk);
1206         int mask = datagram_poll(file, sock, wait);
1207
1208         if (!skb_queue_empty(&scp->other_receive_queue))
1209                 mask |= POLLRDBAND;
1210
1211         return mask;
1212 }
1213
1214 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1215 {
1216         struct sock *sk = sock->sk;
1217         struct dn_scp *scp = DN_SK(sk);
1218         int err = -EOPNOTSUPP;
1219         long amount = 0;
1220         struct sk_buff *skb;
1221         int val;
1222
1223         switch(cmd)
1224         {
1225         case SIOCGIFADDR:
1226         case SIOCSIFADDR:
1227                 return dn_dev_ioctl(cmd, (void __user *)arg);
1228
1229         case SIOCATMARK:
1230                 lock_sock(sk);
1231                 val = !skb_queue_empty(&scp->other_receive_queue);
1232                 if (scp->state != DN_RUN)
1233                         val = -ENOTCONN;
1234                 release_sock(sk);
1235                 return val;
1236
1237         case TIOCOUTQ:
1238                 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1239                 if (amount < 0)
1240                         amount = 0;
1241                 err = put_user(amount, (int __user *)arg);
1242                 break;
1243
1244         case TIOCINQ:
1245                 lock_sock(sk);
1246                 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1247                         amount = skb->len;
1248                 } else {
1249                         struct sk_buff *skb = sk->sk_receive_queue.next;
1250                         for(;;) {
1251                                 if (skb ==
1252                                     (struct sk_buff *)&sk->sk_receive_queue)
1253                                         break;
1254                                 amount += skb->len;
1255                                 skb = skb->next;
1256                         }
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 (dn_ntohs(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 (dn_ntohs(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 val, len;
1580
1581                         if(get_user(len, optlen))
1582                                 return -EFAULT;
1583
1584                         val = nf_getsockopt(sk, PF_DECnet, optname,
1585                                                         optval, &len);
1586                         if (val >= 0)
1587                                 val = put_user(len, optlen);
1588                         return val;
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 = q->next;
1644         int len = 0;
1645
1646         if (flags & MSG_OOB)
1647                 return !skb_queue_empty(q) ? 1 : 0;
1648
1649         while(skb != (struct sk_buff *)q) {
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                 skb = skb->next;
1667         }
1668
1669         return 0;
1670 }
1671
1672
1673 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1674         struct msghdr *msg, size_t size, int flags)
1675 {
1676         struct sock *sk = sock->sk;
1677         struct dn_scp *scp = DN_SK(sk);
1678         struct sk_buff_head *queue = &sk->sk_receive_queue;
1679         size_t target = size > 1 ? 1 : 0;
1680         size_t copied = 0;
1681         int rv = 0;
1682         struct sk_buff *skb, *nskb;
1683         struct dn_skb_cb *cb = NULL;
1684         unsigned char eor = 0;
1685         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1686
1687         lock_sock(sk);
1688
1689         if (sock_flag(sk, SOCK_ZAPPED)) {
1690                 rv = -EADDRNOTAVAIL;
1691                 goto out;
1692         }
1693
1694         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1695                 rv = 0;
1696                 goto out;
1697         }
1698
1699         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1700         if (rv)
1701                 goto out;
1702
1703         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1704                 rv = -EOPNOTSUPP;
1705                 goto out;
1706         }
1707
1708         if (flags & MSG_OOB)
1709                 queue = &scp->other_receive_queue;
1710
1711         if (flags & MSG_WAITALL)
1712                 target = size;
1713
1714
1715         /*
1716          * See if there is data ready to read, sleep if there isn't
1717          */
1718         for(;;) {
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                 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1749                 SOCK_SLEEP_PRE(sk)
1750
1751                 if (!dn_data_ready(sk, queue, flags, target))
1752                         schedule();
1753
1754                 SOCK_SLEEP_POST(sk)
1755                 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1756         }
1757
1758         for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1759                 unsigned int chunk = skb->len;
1760                 cb = DN_SKB_CB(skb);
1761
1762                 if ((chunk + copied) > size)
1763                         chunk = size - copied;
1764
1765                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1766                         rv = -EFAULT;
1767                         break;
1768                 }
1769                 copied += chunk;
1770
1771                 if (!(flags & MSG_PEEK))
1772                         skb_pull(skb, chunk);
1773
1774                 eor = cb->nsp_flags & 0x40;
1775                 nskb = skb->next;
1776
1777                 if (skb->len == 0) {
1778                         skb_unlink(skb, queue);
1779                         kfree_skb(skb);
1780                         /*
1781                          * N.B. Don't refer to skb or cb after this point
1782                          * in loop.
1783                          */
1784                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1785                                 scp->flowloc_sw = DN_SEND;
1786                                 dn_nsp_send_link(sk, DN_SEND, 0);
1787                         }
1788                 }
1789
1790                 if (eor) {
1791                         if (sk->sk_type == SOCK_SEQPACKET)
1792                                 break;
1793                         if (!(flags & MSG_WAITALL))
1794                                 break;
1795                 }
1796
1797                 if (flags & MSG_OOB)
1798                         break;
1799
1800                 if (copied >= target)
1801                         break;
1802         }
1803
1804         rv = copied;
1805
1806
1807         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1808                 msg->msg_flags |= MSG_EOR;
1809
1810 out:
1811         if (rv == 0)
1812                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1813
1814         if ((rv >= 0) && msg->msg_name) {
1815                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1816                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1817         }
1818
1819         release_sock(sk);
1820
1821         return rv;
1822 }
1823
1824
1825 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1826 {
1827         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1828         if (skb_queue_len(queue) >= scp->snd_window)
1829                 return 1;
1830         if (fctype != NSP_FC_NONE) {
1831                 if (flags & MSG_OOB) {
1832                         if (scp->flowrem_oth == 0)
1833                                 return 1;
1834                 } else {
1835                         if (scp->flowrem_dat == 0)
1836                                 return 1;
1837                 }
1838         }
1839         return 0;
1840 }
1841
1842 /*
1843  * The DECnet spec requires that the "routing layer" accepts packets which
1844  * are at least 230 bytes in size. This excludes any headers which the NSP
1845  * layer might add, so we always assume that we'll be using the maximal
1846  * length header on data packets. The variation in length is due to the
1847  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1848  * make much practical difference.
1849  */
1850 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1851 {
1852         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1853         if (dev) {
1854                 struct dn_dev *dn_db = dev->dn_ptr;
1855                 mtu -= LL_RESERVED_SPACE(dev);
1856                 if (dn_db->use_long)
1857                         mtu -= 21;
1858                 else
1859                         mtu -= 6;
1860                 mtu -= DN_MAX_NSP_DATA_HEADER;
1861         } else {
1862                 /*
1863                  * 21 = long header, 16 = guess at MAC header length
1864                  */
1865                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1866         }
1867         if (mtu > mss)
1868                 mss = mtu;
1869         return mss;
1870 }
1871
1872 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1873 {
1874         struct dst_entry *dst = __sk_dst_get(sk);
1875         struct dn_scp *scp = DN_SK(sk);
1876         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1877
1878         /* Other data messages are limited to 16 bytes per packet */
1879         if (flags & MSG_OOB)
1880                 return 16;
1881
1882         /* This works out the maximum size of segment we can send out */
1883         if (dst) {
1884                 u32 mtu = dst_mtu(dst);
1885                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1886         }
1887
1888         return mss_now;
1889 }
1890
1891 /*
1892  * N.B. We get the timeout wrong here, but then we always did get it
1893  * wrong before and this is another step along the road to correcting
1894  * it. It ought to get updated each time we pass through the routine,
1895  * but in practise it probably doesn't matter too much for now.
1896  */
1897 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1898                               unsigned long datalen, int noblock,
1899                               int *errcode)
1900 {
1901         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1902                                                    noblock, errcode);
1903         if (skb) {
1904                 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1905                 skb->pkt_type = PACKET_OUTGOING;
1906         }
1907         return skb;
1908 }
1909
1910 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1911                       struct msghdr *msg, size_t size)
1912 {
1913         struct sock *sk = sock->sk;
1914         struct dn_scp *scp = DN_SK(sk);
1915         size_t mss;
1916         struct sk_buff_head *queue = &scp->data_xmit_queue;
1917         int flags = msg->msg_flags;
1918         int err = 0;
1919         size_t sent = 0;
1920         int addr_len = msg->msg_namelen;
1921         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1922         struct sk_buff *skb = NULL;
1923         struct dn_skb_cb *cb;
1924         size_t len;
1925         unsigned char fctype;
1926         long timeo;
1927
1928         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1929                 return -EOPNOTSUPP;
1930
1931         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1932                 return -EINVAL;
1933
1934         lock_sock(sk);
1935         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1936         /*
1937          * The only difference between stream sockets and sequenced packet
1938          * sockets is that the stream sockets always behave as if MSG_EOR
1939          * has been set.
1940          */
1941         if (sock->type == SOCK_STREAM) {
1942                 if (flags & MSG_EOR) {
1943                         err = -EINVAL;
1944                         goto out;
1945                 }
1946                 flags |= MSG_EOR;
1947         }
1948
1949
1950         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1951         if (err)
1952                 goto out_err;
1953
1954         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1955                 err = -EPIPE;
1956                 if (!(flags & MSG_NOSIGNAL))
1957                         send_sig(SIGPIPE, current, 0);
1958                 goto out_err;
1959         }
1960
1961         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1962                 dst_negative_advice(&sk->sk_dst_cache);
1963
1964         mss = scp->segsize_rem;
1965         fctype = scp->services_rem & NSP_FC_MASK;
1966
1967         mss = dn_current_mss(sk, flags);
1968
1969         if (flags & MSG_OOB) {
1970                 queue = &scp->other_xmit_queue;
1971                 if (size > mss) {
1972                         err = -EMSGSIZE;
1973                         goto out;
1974                 }
1975         }
1976
1977         scp->persist_fxn = dn_nsp_xmit_timeout;
1978
1979         while(sent < size) {
1980                 err = sock_error(sk);
1981                 if (err)
1982                         goto out;
1983
1984                 if (signal_pending(current)) {
1985                         err = sock_intr_errno(timeo);
1986                         goto out;
1987                 }
1988
1989                 /*
1990                  * Calculate size that we wish to send.
1991                  */
1992                 len = size - sent;
1993
1994                 if (len > mss)
1995                         len = mss;
1996
1997                 /*
1998                  * Wait for queue size to go down below the window
1999                  * size.
2000                  */
2001                 if (dn_queue_too_long(scp, queue, flags)) {
2002                         if (flags & MSG_DONTWAIT) {
2003                                 err = -EWOULDBLOCK;
2004                                 goto out;
2005                         }
2006
2007                         SOCK_SLEEP_PRE(sk)
2008
2009                         if (dn_queue_too_long(scp, queue, flags))
2010                                 schedule();
2011
2012                         SOCK_SLEEP_POST(sk)
2013
2014                         continue;
2015                 }
2016
2017                 /*
2018                  * Get a suitably sized skb.
2019                  * 64 is a bit of a hack really, but its larger than any
2020                  * link-layer headers and has served us well as a good
2021                  * guess as to their real length.
2022                  */
2023                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2024                                          flags & MSG_DONTWAIT, &err);
2025
2026                 if (err)
2027                         break;
2028
2029                 if (!skb)
2030                         continue;
2031
2032                 cb = DN_SKB_CB(skb);
2033
2034                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2035
2036                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2037                         err = -EFAULT;
2038                         goto out;
2039                 }
2040
2041                 if (flags & MSG_OOB) {
2042                         cb->nsp_flags = 0x30;
2043                         if (fctype != NSP_FC_NONE)
2044                                 scp->flowrem_oth--;
2045                 } else {
2046                         cb->nsp_flags = 0x00;
2047                         if (scp->seg_total == 0)
2048                                 cb->nsp_flags |= 0x20;
2049
2050                         scp->seg_total += len;
2051
2052                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2053                                 cb->nsp_flags |= 0x40;
2054                                 scp->seg_total = 0;
2055                                 if (fctype == NSP_FC_SCMC)
2056                                         scp->flowrem_dat--;
2057                         }
2058                         if (fctype == NSP_FC_SRC)
2059                                 scp->flowrem_dat--;
2060                 }
2061
2062                 sent += len;
2063                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2064                 skb = NULL;
2065
2066                 scp->persist = dn_nsp_persist(sk);
2067
2068         }
2069 out:
2070
2071         if (skb)
2072                 kfree_skb(skb);
2073
2074         release_sock(sk);
2075
2076         return sent ? sent : err;
2077
2078 out_err:
2079         err = sk_stream_error(sk, flags, err);
2080         release_sock(sk);
2081         return err;
2082 }
2083
2084 static int dn_device_event(struct notifier_block *this, unsigned long event,
2085                         void *ptr)
2086 {
2087         struct net_device *dev = (struct net_device *)ptr;
2088
2089         switch(event) {
2090                 case NETDEV_UP:
2091                         dn_dev_up(dev);
2092                         break;
2093                 case NETDEV_DOWN:
2094                         dn_dev_down(dev);
2095                         break;
2096                 default:
2097                         break;
2098         }
2099
2100         return NOTIFY_DONE;
2101 }
2102
2103 static struct notifier_block dn_dev_notifier = {
2104         .notifier_call = dn_device_event,
2105 };
2106
2107 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2108
2109 static struct packet_type dn_dix_packet_type = {
2110         .type =         __constant_htons(ETH_P_DNA_RT),
2111         .dev =          NULL,           /* All devices */
2112         .func =         dn_route_rcv,
2113 };
2114
2115 #ifdef CONFIG_PROC_FS
2116 struct dn_iter_state {
2117         int bucket;
2118 };
2119
2120 static struct sock *dn_socket_get_first(struct seq_file *seq)
2121 {
2122         struct dn_iter_state *state = seq->private;
2123         struct sock *n = NULL;
2124
2125         for(state->bucket = 0;
2126             state->bucket < DN_SK_HASH_SIZE;
2127             ++state->bucket) {
2128                 n = sk_head(&dn_sk_hash[state->bucket]);
2129                 if (n)
2130                         break;
2131         }
2132
2133         return n;
2134 }
2135
2136 static struct sock *dn_socket_get_next(struct seq_file *seq,
2137                                        struct sock *n)
2138 {
2139         struct dn_iter_state *state = seq->private;
2140
2141         n = sk_next(n);
2142 try_again:
2143         if (n)
2144                 goto out;
2145         if (++state->bucket >= DN_SK_HASH_SIZE)
2146                 goto out;
2147         n = sk_head(&dn_sk_hash[state->bucket]);
2148         goto try_again;
2149 out:
2150         return n;
2151 }
2152
2153 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2154 {
2155         struct sock *sk = dn_socket_get_first(seq);
2156
2157         if (sk) {
2158                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2159                         --*pos;
2160         }
2161         return *pos ? NULL : sk;
2162 }
2163
2164 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2165 {
2166         void *rc;
2167         read_lock_bh(&dn_hash_lock);
2168         rc = socket_get_idx(seq, &pos);
2169         if (!rc) {
2170                 read_unlock_bh(&dn_hash_lock);
2171         }
2172         return rc;
2173 }
2174
2175 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2176 {
2177         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2178 }
2179
2180 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2181 {
2182         void *rc;
2183
2184         if (v == SEQ_START_TOKEN) {
2185                 rc = dn_socket_get_idx(seq, 0);
2186                 goto out;
2187         }
2188
2189         rc = dn_socket_get_next(seq, v);
2190         if (rc)
2191                 goto out;
2192         read_unlock_bh(&dn_hash_lock);
2193 out:
2194         ++*pos;
2195         return rc;
2196 }
2197
2198 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2199 {
2200         if (v && v != SEQ_START_TOKEN)
2201                 read_unlock_bh(&dn_hash_lock);
2202 }
2203
2204 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2205
2206 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2207 {
2208         int i;
2209
2210         switch (dn_ntohs(dn->sdn_objnamel)) {
2211                 case 0:
2212                         sprintf(buf, "%d", dn->sdn_objnum);
2213                         break;
2214                 default:
2215                         for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2216                                 buf[i] = dn->sdn_objname[i];
2217                                 if (IS_NOT_PRINTABLE(buf[i]))
2218                                         buf[i] = '.';
2219                         }
2220                         buf[i] = 0;
2221         }
2222 }
2223
2224 static char *dn_state2asc(unsigned char state)
2225 {
2226         switch(state) {
2227                 case DN_O:
2228                         return "OPEN";
2229                 case DN_CR:
2230                         return "  CR";
2231                 case DN_DR:
2232                         return "  DR";
2233                 case DN_DRC:
2234                         return " DRC";
2235                 case DN_CC:
2236                         return "  CC";
2237                 case DN_CI:
2238                         return "  CI";
2239                 case DN_NR:
2240                         return "  NR";
2241                 case DN_NC:
2242                         return "  NC";
2243                 case DN_CD:
2244                         return "  CD";
2245                 case DN_RJ:
2246                         return "  RJ";
2247                 case DN_RUN:
2248                         return " RUN";
2249                 case DN_DI:
2250                         return "  DI";
2251                 case DN_DIC:
2252                         return " DIC";
2253                 case DN_DN:
2254                         return "  DN";
2255                 case DN_CL:
2256                         return "  CL";
2257                 case DN_CN:
2258                         return "  CN";
2259         }
2260
2261         return "????";
2262 }
2263
2264 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2265 {
2266         struct dn_scp *scp = DN_SK(sk);
2267         char buf1[DN_ASCBUF_LEN];
2268         char buf2[DN_ASCBUF_LEN];
2269         char local_object[DN_MAXOBJL+3];
2270         char remote_object[DN_MAXOBJL+3];
2271
2272         dn_printable_object(&scp->addr, local_object);
2273         dn_printable_object(&scp->peer, remote_object);
2274
2275         seq_printf(seq,
2276                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2277                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2278                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2279                    scp->addrloc,
2280                    scp->numdat,
2281                    scp->numoth,
2282                    scp->ackxmt_dat,
2283                    scp->ackxmt_oth,
2284                    scp->flowloc_sw,
2285                    local_object,
2286                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2287                    scp->addrrem,
2288                    scp->numdat_rcv,
2289                    scp->numoth_rcv,
2290                    scp->ackrcv_dat,
2291                    scp->ackrcv_oth,
2292                    scp->flowrem_sw,
2293                    remote_object,
2294                    dn_state2asc(scp->state),
2295                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2296 }
2297
2298 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2299 {
2300         if (v == SEQ_START_TOKEN) {
2301                 seq_puts(seq, "Local                                              Remote\n");
2302         } else {
2303                 dn_socket_format_entry(seq, v);
2304         }
2305         return 0;
2306 }
2307
2308 static const struct seq_operations dn_socket_seq_ops = {
2309         .start  = dn_socket_seq_start,
2310         .next   = dn_socket_seq_next,
2311         .stop   = dn_socket_seq_stop,
2312         .show   = dn_socket_seq_show,
2313 };
2314
2315 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2316 {
2317         struct seq_file *seq;
2318         int rc = -ENOMEM;
2319         struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2320
2321         if (!s)
2322                 goto out;
2323
2324         rc = seq_open(file, &dn_socket_seq_ops);
2325         if (rc)
2326                 goto out_kfree;
2327
2328         seq             = file->private_data;
2329         seq->private    = s;
2330         memset(s, 0, sizeof(*s));
2331 out:
2332         return rc;
2333 out_kfree:
2334         kfree(s);
2335         goto out;
2336 }
2337
2338 static const struct file_operations dn_socket_seq_fops = {
2339         .owner          = THIS_MODULE,
2340         .open           = dn_socket_seq_open,
2341         .read           = seq_read,
2342         .llseek         = seq_lseek,
2343         .release        = seq_release_private,
2344 };
2345 #endif
2346
2347 static struct net_proto_family  dn_family_ops = {
2348         .family =       AF_DECnet,
2349         .create =       dn_create,
2350         .owner  =       THIS_MODULE,
2351 };
2352
2353 static const struct proto_ops dn_proto_ops = {
2354         .family =       AF_DECnet,
2355         .owner =        THIS_MODULE,
2356         .release =      dn_release,
2357         .bind =         dn_bind,
2358         .connect =      dn_connect,
2359         .socketpair =   sock_no_socketpair,
2360         .accept =       dn_accept,
2361         .getname =      dn_getname,
2362         .poll =         dn_poll,
2363         .ioctl =        dn_ioctl,
2364         .listen =       dn_listen,
2365         .shutdown =     dn_shutdown,
2366         .setsockopt =   dn_setsockopt,
2367         .getsockopt =   dn_getsockopt,
2368         .sendmsg =      dn_sendmsg,
2369         .recvmsg =      dn_recvmsg,
2370         .mmap =         sock_no_mmap,
2371         .sendpage =     sock_no_sendpage,
2372 };
2373
2374 void dn_register_sysctl(void);
2375 void dn_unregister_sysctl(void);
2376
2377 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2378 MODULE_AUTHOR("Linux DECnet Project Team");
2379 MODULE_LICENSE("GPL");
2380 MODULE_ALIAS_NETPROTO(PF_DECnet);
2381
2382 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2383
2384 static int __init decnet_init(void)
2385 {
2386         int rc;
2387
2388         printk(banner);
2389
2390         rc = proto_register(&dn_proto, 1);
2391         if (rc != 0)
2392                 goto out;
2393
2394         dn_neigh_init();
2395         dn_dev_init();
2396         dn_route_init();
2397         dn_fib_init();
2398
2399         sock_register(&dn_family_ops);
2400         dev_add_pack(&dn_dix_packet_type);
2401         register_netdevice_notifier(&dn_dev_notifier);
2402
2403         proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
2404         dn_register_sysctl();
2405 out:
2406         return rc;
2407
2408 }
2409 module_init(decnet_init);
2410
2411 /*
2412  * Prevent DECnet module unloading until its fixed properly.
2413  * Requires an audit of the code to check for memory leaks and
2414  * initialisation problems etc.
2415  */
2416 #if 0
2417 static void __exit decnet_exit(void)
2418 {
2419         sock_unregister(AF_DECnet);
2420         rtnl_unregister_all(PF_DECnet);
2421         dev_remove_pack(&dn_dix_packet_type);
2422
2423         dn_unregister_sysctl();
2424
2425         unregister_netdevice_notifier(&dn_dev_notifier);
2426
2427         dn_route_cleanup();
2428         dn_dev_cleanup();
2429         dn_neigh_cleanup();
2430         dn_fib_cleanup();
2431
2432         proc_net_remove(&init_net, "decnet");
2433
2434         proto_unregister(&dn_proto);
2435 }
2436 module_exit(decnet_exit);
2437 #endif