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/ioctls.h>
 123 #include <linux/capability.h>
 124 #include <linux/mm.h>
 125 #include <linux/interrupt.h>
 126 #include <linux/proc_fs.h>
 127 #include <linux/stat.h>
 128 #include <linux/init.h>
 129 #include <linux/poll.h>
 130 #include <net/net_namespace.h>
 131 #include <net/neighbour.h>
 132 #include <net/dst.h>
 133 #include <net/fib_rules.h>
 134 #include <net/dn.h>
 135 #include <net/dn_nsp.h>
 136 #include <net/dn_dev.h>
 137 #include <net/dn_route.h>
 138 #include <net/dn_fib.h>
 139 #include <net/dn_neigh.h>
 140
 141 struct dn_sock {
 142         struct sock sk;
 143         struct dn_scp scp;
 144 };
 145
 146 static void dn_keepalive(struct sock *sk);
 147
 148 #define DN_SK_HASH_SHIFT 8
 149 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
 150 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
 151
 152
 153 static const struct proto_ops dn_proto_ops;
 154 static DEFINE_RWLOCK(dn_hash_lock);
 155 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 156 static struct hlist_head dn_wild_sk;
 157 static atomic_long_t decnet_memory_allocated;
 158
 159 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
 160 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 161
 162 static struct hlist_head *dn_find_list(struct sock *sk)
 163 {
 164         struct dn_scp *scp = DN_SK(sk);
 165
 166         if (scp->addr.sdn_flags & SDF_WILD)
 167                 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
 168
 169         return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
 170 }
 171
 172 /*
 173  * Valid ports are those greater than zero and not already in use.
 174  */
 175 static int check_port(__le16 port)
 176 {
 177         struct sock *sk;
 178         struct hlist_node *node;
 179
 180         if (port == 0)
 181                 return -1;
 182
 183         sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
 184                 struct dn_scp *scp = DN_SK(sk);
 185                 if (scp->addrloc == port)
 186                         return -1;
 187         }
 188         return 0;
 189 }
 190
 191 static unsigned short port_alloc(struct sock *sk)
 192 {
 193         struct dn_scp *scp = DN_SK(sk);
 194 static unsigned short port = 0x2000;
 195         unsigned short i_port = port;
 196
 197         while(check_port(cpu_to_le16(++port)) != 0) {
 198                 if (port == i_port)
 199                         return 0;
 200         }
 201
 202         scp->addrloc = cpu_to_le16(port);
 203
 204         return 1;
 205 }
 206
 207 /*
 208  * Since this is only ever called from user
 209  * level, we don't need a write_lock() version
 210  * of this.
 211  */
 212 static int dn_hash_sock(struct sock *sk)
 213 {
 214         struct dn_scp *scp = DN_SK(sk);
 215         struct hlist_head *list;
 216         int rv = -EUSERS;
 217
 218         BUG_ON(sk_hashed(sk));
 219
 220         write_lock_bh(&dn_hash_lock);
 221
 222         if (!scp->addrloc && !port_alloc(sk))
 223                 goto out;
 224
 225         rv = -EADDRINUSE;
 226         if ((list = dn_find_list(sk)) == NULL)
 227                 goto out;
 228
 229         sk_add_node(sk, list);
 230         rv = 0;
 231 out:
 232         write_unlock_bh(&dn_hash_lock);
 233         return rv;
 234 }
 235
 236 static void dn_unhash_sock(struct sock *sk)
 237 {
 238         write_lock(&dn_hash_lock);
 239         sk_del_node_init(sk);
 240         write_unlock(&dn_hash_lock);
 241 }
 242
 243 static void dn_unhash_sock_bh(struct sock *sk)
 244 {
 245         write_lock_bh(&dn_hash_lock);
 246         sk_del_node_init(sk);
 247         write_unlock_bh(&dn_hash_lock);
 248 }
 249
 250 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
 251 {
 252         int i;
 253         unsigned int hash = addr->sdn_objnum;
 254
 255         if (hash == 0) {
 256                 hash = addr->sdn_objnamel;
 257                 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
 258                         hash ^= addr->sdn_objname[i];
 259                         hash ^= (hash << 3);
 260                 }
 261         }
 262
 263         return &dn_sk_hash[hash & DN_SK_HASH_MASK];
 264 }
 265
 266 /*
 267  * Called to transform a socket from bound (i.e. with a local address)
 268  * into a listening socket (doesn't need a local port number) and rehashes
 269  * based upon the object name/number.
 270  */
 271 static void dn_rehash_sock(struct sock *sk)
 272 {
 273         struct hlist_head *list;
 274         struct dn_scp *scp = DN_SK(sk);
 275
 276         if (scp->addr.sdn_flags & SDF_WILD)
 277                 return;
 278
 279         write_lock_bh(&dn_hash_lock);
 280         sk_del_node_init(sk);
 281         DN_SK(sk)->addrloc = 0;
 282         list = listen_hash(&DN_SK(sk)->addr);
 283         sk_add_node(sk, list);
 284         write_unlock_bh(&dn_hash_lock);
 285 }
 286
 287 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
 288 {
 289         int len = 2;
 290
 291         *buf++ = type;
 292
 293         switch (type) {
 294         case 0:
 295                 *buf++ = sdn->sdn_objnum;
 296                 break;
 297         case 1:
 298                 *buf++ = 0;
 299                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
 300                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 301                 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
 302                 break;
 303         case 2:
 304                 memset(buf, 0, 5);
 305                 buf += 5;
 306                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
 307                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 308                 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
 309                 break;
 310         }
 311
 312         return len;
 313 }
 314
 315 /*
 316  * On reception of usernames, we handle types 1 and 0 for destination
 317  * addresses only. Types 2 and 4 are used for source addresses, but the
 318  * UIC, GIC are ignored and they are both treated the same way. Type 3
 319  * is never used as I've no idea what its purpose might be or what its
 320  * format is.
 321  */
 322 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
 323 {
 324         unsigned char type;
 325         int size = len;
 326         int namel = 12;
 327
 328         sdn->sdn_objnum = 0;
 329         sdn->sdn_objnamel = cpu_to_le16(0);
 330         memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 331
 332         if (len < 2)
 333                 return -1;
 334
 335         len -= 2;
 336         *fmt = *data++;
 337         type = *data++;
 338
 339         switch (*fmt) {
 340         case 0:
 341                 sdn->sdn_objnum = type;
 342                 return 2;
 343         case 1:
 344                 namel = 16;
 345                 break;
 346         case 2:
 347                 len  -= 4;
 348                 data += 4;
 349                 break;
 350         case 4:
 351                 len  -= 8;
 352                 data += 8;
 353                 break;
 354         default:
 355                 return -1;
 356         }
 357
 358         len -= 1;
 359
 360         if (len < 0)
 361                 return -1;
 362
 363         sdn->sdn_objnamel = cpu_to_le16(*data++);
 364         len -= le16_to_cpu(sdn->sdn_objnamel);
 365
 366         if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
 367                 return -1;
 368
 369         memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
 370
 371         return size - len;
 372 }
 373
 374 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
 375 {
 376         struct hlist_head *list = listen_hash(addr);
 377         struct hlist_node *node;
 378         struct sock *sk;
 379
 380         read_lock(&dn_hash_lock);
 381         sk_for_each(sk, node, list) {
 382                 struct dn_scp *scp = DN_SK(sk);
 383                 if (sk->sk_state != TCP_LISTEN)
 384                         continue;
 385                 if (scp->addr.sdn_objnum) {
 386                         if (scp->addr.sdn_objnum != addr->sdn_objnum)
 387                                 continue;
 388                 } else {
 389                         if (addr->sdn_objnum)
 390                                 continue;
 391                         if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 392                                 continue;
 393                         if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
 394                                 continue;
 395                 }
 396                 sock_hold(sk);
 397                 read_unlock(&dn_hash_lock);
 398                 return sk;
 399         }
 400
 401         sk = sk_head(&dn_wild_sk);
 402         if (sk) {
 403                 if (sk->sk_state == TCP_LISTEN)
 404                         sock_hold(sk);
 405                 else
 406                         sk = NULL;
 407         }
 408
 409         read_unlock(&dn_hash_lock);
 410         return sk;
 411 }
 412
 413 struct sock *dn_find_by_skb(struct sk_buff *skb)
 414 {
 415         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 416         struct sock *sk;
 417         struct hlist_node *node;
 418         struct dn_scp *scp;
 419
 420         read_lock(&dn_hash_lock);
 421         sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
 422                 scp = DN_SK(sk);
 423                 if (cb->src != dn_saddr2dn(&scp->peer))
 424                         continue;
 425                 if (cb->dst_port != scp->addrloc)
 426                         continue;
 427                 if (scp->addrrem && (cb->src_port != scp->addrrem))
 428                         continue;
 429                 sock_hold(sk);
 430                 goto found;
 431         }
 432         sk = NULL;
 433 found:
 434         read_unlock(&dn_hash_lock);
 435         return sk;
 436 }
 437
 438
 439
 440 static void dn_destruct(struct sock *sk)
 441 {
 442         struct dn_scp *scp = DN_SK(sk);
 443
 444         skb_queue_purge(&scp->data_xmit_queue);
 445         skb_queue_purge(&scp->other_xmit_queue);
 446         skb_queue_purge(&scp->other_receive_queue);
 447
 448         dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
 449 }
 450
 451 static int dn_memory_pressure;
 452
 453 static void dn_enter_memory_pressure(struct sock *sk)
 454 {
 455         if (!dn_memory_pressure) {
 456                 dn_memory_pressure = 1;
 457         }
 458 }
 459
 460 static struct proto dn_proto = {
 461         .name                   = "NSP",
 462         .owner                  = THIS_MODULE,
 463         .enter_memory_pressure  = dn_enter_memory_pressure,
 464         .memory_pressure        = &dn_memory_pressure,
 465         .memory_allocated       = &decnet_memory_allocated,
 466         .sysctl_mem             = sysctl_decnet_mem,
 467         .sysctl_wmem            = sysctl_decnet_wmem,
 468         .sysctl_rmem            = sysctl_decnet_rmem,
 469         .max_header             = DN_MAX_NSP_DATA_HEADER + 64,
 470         .obj_size               = sizeof(struct dn_sock),
 471 };
 472
 473 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
 474 {
 475         struct dn_scp *scp;
 476         struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
 477
 478         if  (!sk)
 479                 goto out;
 480
 481         if (sock)
 482                 sock->ops = &dn_proto_ops;
 483         sock_init_data(sock, sk);
 484
 485         sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 486         sk->sk_destruct    = dn_destruct;
 487         sk->sk_no_check    = 1;
 488         sk->sk_family      = PF_DECnet;
 489         sk->sk_protocol    = 0;
 490         sk->sk_allocation  = gfp;
 491         sk->sk_sndbuf      = sysctl_decnet_wmem[1];
 492         sk->sk_rcvbuf      = sysctl_decnet_rmem[1];
 493
 494         /* Initialization of DECnet Session Control Port                */
 495         scp = DN_SK(sk);
 496         scp->state      = DN_O;         /* Open                 */
 497         scp->numdat     = 1;            /* Next data seg to tx  */
 498         scp->numoth     = 1;            /* Next oth data to tx  */
 499         scp->ackxmt_dat = 0;            /* Last data seg ack'ed */
 500         scp->ackxmt_oth = 0;            /* Last oth data ack'ed */
 501         scp->ackrcv_dat = 0;            /* Highest data ack recv*/
 502         scp->ackrcv_oth = 0;            /* Last oth data ack rec*/
 503         scp->flowrem_sw = DN_SEND;
 504         scp->flowloc_sw = DN_SEND;
 505         scp->flowrem_dat = 0;
 506         scp->flowrem_oth = 1;
 507         scp->flowloc_dat = 0;
 508         scp->flowloc_oth = 1;
 509         scp->services_rem = 0;
 510         scp->services_loc = 1 | NSP_FC_NONE;
 511         scp->info_rem = 0;
 512         scp->info_loc = 0x03; /* NSP version 4.1 */
 513         scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 514         scp->nonagle = 0;
 515         scp->multi_ireq = 1;
 516         scp->accept_mode = ACC_IMMED;
 517         scp->addr.sdn_family    = AF_DECnet;
 518         scp->peer.sdn_family    = AF_DECnet;
 519         scp->accessdata.acc_accl = 5;
 520         memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 521
 522         scp->max_window   = NSP_MAX_WINDOW;
 523         scp->snd_window   = NSP_MIN_WINDOW;
 524         scp->nsp_srtt     = NSP_INITIAL_SRTT;
 525         scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 526         scp->nsp_rxtshift = 0;
 527
 528         skb_queue_head_init(&scp->data_xmit_queue);
 529         skb_queue_head_init(&scp->other_xmit_queue);
 530         skb_queue_head_init(&scp->other_receive_queue);
 531
 532         scp->persist = 0;
 533         scp->persist_fxn = NULL;
 534         scp->keepalive = 10 * HZ;
 535         scp->keepalive_fxn = dn_keepalive;
 536
 537         init_timer(&scp->delack_timer);
 538         scp->delack_pending = 0;
 539         scp->delack_fxn = dn_nsp_delayed_ack;
 540
 541         dn_start_slow_timer(sk);
 542 out:
 543         return sk;
 544 }
 545
 546 /*
 547  * Keepalive timer.
 548  * FIXME: Should respond to SO_KEEPALIVE etc.
 549  */
 550 static void dn_keepalive(struct sock *sk)
 551 {
 552         struct dn_scp *scp = DN_SK(sk);
 553
 554         /*
 555          * By checking the other_data transmit queue is empty
 556          * we are double checking that we are not sending too
 557          * many of these keepalive frames.
 558          */
 559         if (skb_queue_empty(&scp->other_xmit_queue))
 560                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 561 }
 562
 563
 564 /*
 565  * Timer for shutdown/destroyed sockets.
 566  * When socket is dead & no packets have been sent for a
 567  * certain amount of time, they are removed by this
 568  * routine. Also takes care of sending out DI & DC
 569  * frames at correct times.
 570  */
 571 int dn_destroy_timer(struct sock *sk)
 572 {
 573         struct dn_scp *scp = DN_SK(sk);
 574
 575         scp->persist = dn_nsp_persist(sk);
 576
 577         switch (scp->state) {
 578         case DN_DI:
 579                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 580                 if (scp->nsp_rxtshift >= decnet_di_count)
 581                         scp->state = DN_CN;
 582                 return 0;
 583
 584         case DN_DR:
 585                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 586                 if (scp->nsp_rxtshift >= decnet_dr_count)
 587                         scp->state = DN_DRC;
 588                 return 0;
 589
 590         case DN_DN:
 591                 if (scp->nsp_rxtshift < decnet_dn_count) {
 592                         /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 593                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 594                                          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                      int kern)
 680 {
 681         struct sock *sk;
 682
 683         if (!net_eq(net, &init_net))
 684                 return -EAFNOSUPPORT;
 685
 686         switch (sock->type) {
 687         case SOCK_SEQPACKET:
 688                 if (protocol != DNPROTO_NSP)
 689                         return -EPROTONOSUPPORT;
 690                 break;
 691         case SOCK_STREAM:
 692                 break;
 693         default:
 694                 return -ESOCKTNOSUPPORT;
 695         }
 696
 697
 698         if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
 699                 return -ENOBUFS;
 700
 701         sk->sk_protocol = protocol;
 702
 703         return 0;
 704 }
 705
 706
 707 static int
 708 dn_release(struct socket *sock)
 709 {
 710         struct sock *sk = sock->sk;
 711
 712         if (sk) {
 713                 sock_orphan(sk);
 714                 sock_hold(sk);
 715                 lock_sock(sk);
 716                 dn_destroy_sock(sk);
 717                 release_sock(sk);
 718                 sock_put(sk);
 719         }
 720
 721         return 0;
 722 }
 723
 724 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 725 {
 726         struct sock *sk = sock->sk;
 727         struct dn_scp *scp = DN_SK(sk);
 728         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 729         struct net_device *dev, *ldev;
 730         int rv;
 731
 732         if (addr_len != sizeof(struct sockaddr_dn))
 733                 return -EINVAL;
 734
 735         if (saddr->sdn_family != AF_DECnet)
 736                 return -EINVAL;
 737
 738         if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
 739                 return -EINVAL;
 740
 741         if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
 742                 return -EINVAL;
 743
 744         if (saddr->sdn_flags & ~SDF_WILD)
 745                 return -EINVAL;
 746
 747         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 748             (saddr->sdn_flags & SDF_WILD)))
 749                 return -EACCES;
 750
 751         if (!(saddr->sdn_flags & SDF_WILD)) {
 752                 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
 753                         rcu_read_lock();
 754                         ldev = NULL;
 755                         for_each_netdev_rcu(&init_net, dev) {
 756                                 if (!dev->dn_ptr)
 757                                         continue;
 758                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 759                                         ldev = dev;
 760                                         break;
 761                                 }
 762                         }
 763                         rcu_read_unlock();
 764                         if (ldev == NULL)
 765                                 return -EADDRNOTAVAIL;
 766                 }
 767         }
 768
 769         rv = -EINVAL;
 770         lock_sock(sk);
 771         if (sock_flag(sk, SOCK_ZAPPED)) {
 772                 memcpy(&scp->addr, saddr, addr_len);
 773                 sock_reset_flag(sk, SOCK_ZAPPED);
 774
 775                 rv = dn_hash_sock(sk);
 776                 if (rv)
 777                         sock_set_flag(sk, SOCK_ZAPPED);
 778         }
 779         release_sock(sk);
 780
 781         return rv;
 782 }
 783
 784
 785 static int dn_auto_bind(struct socket *sock)
 786 {
 787         struct sock *sk = sock->sk;
 788         struct dn_scp *scp = DN_SK(sk);
 789         int rv;
 790
 791         sock_reset_flag(sk, SOCK_ZAPPED);
 792
 793         scp->addr.sdn_flags  = 0;
 794         scp->addr.sdn_objnum = 0;
 795
 796         /*
 797          * This stuff is to keep compatibility with Eduardo's
 798          * patch. I hope I can dispense with it shortly...
 799          */
 800         if ((scp->accessdata.acc_accl != 0) &&
 801                 (scp->accessdata.acc_accl <= 12)) {
 802
 803                 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
 804                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
 805
 806                 scp->accessdata.acc_accl = 0;
 807                 memset(scp->accessdata.acc_acc, 0, 40);
 808         }
 809         /* End of compatibility stuff */
 810
 811         scp->addr.sdn_add.a_len = cpu_to_le16(2);
 812         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 813         if (rv == 0) {
 814                 rv = dn_hash_sock(sk);
 815                 if (rv)
 816                         sock_set_flag(sk, SOCK_ZAPPED);
 817         }
 818
 819         return rv;
 820 }
 821
 822 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 823 {
 824         struct dn_scp *scp = DN_SK(sk);
 825         DEFINE_WAIT(wait);
 826         int err;
 827
 828         if (scp->state != DN_CR)
 829                 return -EINVAL;
 830
 831         scp->state = DN_CC;
 832         scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
 833         dn_send_conn_conf(sk, allocation);
 834
 835         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 836         for(;;) {
 837                 release_sock(sk);
 838                 if (scp->state == DN_CC)
 839                         *timeo = schedule_timeout(*timeo);
 840                 lock_sock(sk);
 841                 err = 0;
 842                 if (scp->state == DN_RUN)
 843                         break;
 844                 err = sock_error(sk);
 845                 if (err)
 846                         break;
 847                 err = sock_intr_errno(*timeo);
 848                 if (signal_pending(current))
 849                         break;
 850                 err = -EAGAIN;
 851                 if (!*timeo)
 852                         break;
 853                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 854         }
 855         finish_wait(sk_sleep(sk), &wait);
 856         if (err == 0) {
 857                 sk->sk_socket->state = SS_CONNECTED;
 858         } else if (scp->state != DN_CC) {
 859                 sk->sk_socket->state = SS_UNCONNECTED;
 860         }
 861         return err;
 862 }
 863
 864 static int dn_wait_run(struct sock *sk, long *timeo)
 865 {
 866         struct dn_scp *scp = DN_SK(sk);
 867         DEFINE_WAIT(wait);
 868         int err = 0;
 869
 870         if (scp->state == DN_RUN)
 871                 goto out;
 872
 873         if (!*timeo)
 874                 return -EALREADY;
 875
 876         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 877         for(;;) {
 878                 release_sock(sk);
 879                 if (scp->state == DN_CI || scp->state == DN_CC)
 880                         *timeo = schedule_timeout(*timeo);
 881                 lock_sock(sk);
 882                 err = 0;
 883                 if (scp->state == DN_RUN)
 884                         break;
 885                 err = sock_error(sk);
 886                 if (err)
 887                         break;
 888                 err = sock_intr_errno(*timeo);
 889                 if (signal_pending(current))
 890                         break;
 891                 err = -ETIMEDOUT;
 892                 if (!*timeo)
 893                         break;
 894                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 895         }
 896         finish_wait(sk_sleep(sk), &wait);
 897 out:
 898         if (err == 0) {
 899                 sk->sk_socket->state = SS_CONNECTED;
 900         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 901                 sk->sk_socket->state = SS_UNCONNECTED;
 902         }
 903         return err;
 904 }
 905
 906 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 907 {
 908         struct socket *sock = sk->sk_socket;
 909         struct dn_scp *scp = DN_SK(sk);
 910         int err = -EISCONN;
 911         struct flowidn fld;
 912
 913         if (sock->state == SS_CONNECTED)
 914                 goto out;
 915
 916         if (sock->state == SS_CONNECTING) {
 917                 err = 0;
 918                 if (scp->state == DN_RUN) {
 919                         sock->state = SS_CONNECTED;
 920                         goto out;
 921                 }
 922                 err = -ECONNREFUSED;
 923                 if (scp->state != DN_CI && scp->state != DN_CC) {
 924                         sock->state = SS_UNCONNECTED;
 925                         goto out;
 926                 }
 927                 return dn_wait_run(sk, timeo);
 928         }
 929
 930         err = -EINVAL;
 931         if (scp->state != DN_O)
 932                 goto out;
 933
 934         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 935                 goto out;
 936         if (addr->sdn_family != AF_DECnet)
 937                 goto out;
 938         if (addr->sdn_flags & SDF_WILD)
 939                 goto out;
 940
 941         if (sock_flag(sk, SOCK_ZAPPED)) {
 942                 err = dn_auto_bind(sk->sk_socket);
 943                 if (err)
 944                         goto out;
 945         }
 946
 947         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 948
 949         err = -EHOSTUNREACH;
 950         memset(&fld, 0, sizeof(fld));
 951         fld.flowidn_oif = sk->sk_bound_dev_if;
 952         fld.daddr = dn_saddr2dn(&scp->peer);
 953         fld.saddr = dn_saddr2dn(&scp->addr);
 954         dn_sk_ports_copy(&fld, scp);
 955         fld.flowidn_proto = DNPROTO_NSP;
 956         if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
 957                 goto out;
 958         sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 959         sock->state = SS_CONNECTING;
 960         scp->state = DN_CI;
 961         scp->segsize_loc = dst_metric_advmss(sk->sk_dst_cache);
 962
 963         dn_nsp_send_conninit(sk, NSP_CI);
 964         err = -EINPROGRESS;
 965         if (*timeo) {
 966                 err = dn_wait_run(sk, timeo);
 967         }
 968 out:
 969         return err;
 970 }
 971
 972 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 973 {
 974         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 975         struct sock *sk = sock->sk;
 976         int err;
 977         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 978
 979         lock_sock(sk);
 980         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 981         release_sock(sk);
 982
 983         return err;
 984 }
 985
 986 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 987 {
 988         struct dn_scp *scp = DN_SK(sk);
 989
 990         switch (scp->state) {
 991         case DN_RUN:
 992                 return 0;
 993         case DN_CR:
 994                 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 995         case DN_CI:
 996         case DN_CC:
 997                 return dn_wait_run(sk, timeo);
 998         case DN_O:
 999                 return __dn_connect(sk, addr, addrlen, timeo, flags);
1000         }
1001
1002         return -EINVAL;
1003 }
1004
1005
1006 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1007 {
1008         unsigned char *ptr = skb->data;
1009
1010         acc->acc_userl = *ptr++;
1011         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1012         ptr += acc->acc_userl;
1013
1014         acc->acc_passl = *ptr++;
1015         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1016         ptr += acc->acc_passl;
1017
1018         acc->acc_accl = *ptr++;
1019         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1020
1021         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1022
1023 }
1024
1025 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1026 {
1027         unsigned char *ptr = skb->data;
1028         u16 len = *ptr++; /* yes, it's 8bit on the wire */
1029
1030         BUG_ON(len > 16); /* we've checked the contents earlier */
1031         opt->opt_optl   = cpu_to_le16(len);
1032         opt->opt_status = 0;
1033         memcpy(opt->opt_data, ptr, len);
1034         skb_pull(skb, len + 1);
1035 }
1036
1037 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1038 {
1039         DEFINE_WAIT(wait);
1040         struct sk_buff *skb = NULL;
1041         int err = 0;
1042
1043         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1044         for(;;) {
1045                 release_sock(sk);
1046                 skb = skb_dequeue(&sk->sk_receive_queue);
1047                 if (skb == NULL) {
1048                         *timeo = schedule_timeout(*timeo);
1049                         skb = skb_dequeue(&sk->sk_receive_queue);
1050                 }
1051                 lock_sock(sk);
1052                 if (skb != NULL)
1053                         break;
1054                 err = -EINVAL;
1055                 if (sk->sk_state != TCP_LISTEN)
1056                         break;
1057                 err = sock_intr_errno(*timeo);
1058                 if (signal_pending(current))
1059                         break;
1060                 err = -EAGAIN;
1061                 if (!*timeo)
1062                         break;
1063                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1064         }
1065         finish_wait(sk_sleep(sk), &wait);
1066
1067         return skb == NULL ? ERR_PTR(err) : skb;
1068 }
1069
1070 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1071 {
1072         struct sock *sk = sock->sk, *newsk;
1073         struct sk_buff *skb = NULL;
1074         struct dn_skb_cb *cb;
1075         unsigned char menuver;
1076         int err = 0;
1077         unsigned char type;
1078         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1079         struct dst_entry *dst;
1080
1081         lock_sock(sk);
1082
1083         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1084                 release_sock(sk);
1085                 return -EINVAL;
1086         }
1087
1088         skb = skb_dequeue(&sk->sk_receive_queue);
1089         if (skb == NULL) {
1090                 skb = dn_wait_for_connect(sk, &timeo);
1091                 if (IS_ERR(skb)) {
1092                         release_sock(sk);
1093                         return PTR_ERR(skb);
1094                 }
1095         }
1096
1097         cb = DN_SKB_CB(skb);
1098         sk->sk_ack_backlog--;
1099         newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1100         if (newsk == NULL) {
1101                 release_sock(sk);
1102                 kfree_skb(skb);
1103                 return -ENOBUFS;
1104         }
1105         release_sock(sk);
1106
1107         dst = skb_dst(skb);
1108         sk_dst_set(newsk, dst);
1109         skb_dst_set(skb, NULL);
1110
1111         DN_SK(newsk)->state        = DN_CR;
1112         DN_SK(newsk)->addrrem      = cb->src_port;
1113         DN_SK(newsk)->services_rem = cb->services;
1114         DN_SK(newsk)->info_rem     = cb->info;
1115         DN_SK(newsk)->segsize_rem  = cb->segsize;
1116         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1117
1118         if (DN_SK(newsk)->segsize_rem < 230)
1119                 DN_SK(newsk)->segsize_rem = 230;
1120
1121         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1122                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1123
1124         newsk->sk_state  = TCP_LISTEN;
1125         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1126
1127         /*
1128          * If we are listening on a wild socket, we don't want
1129          * the newly created socket on the wrong hash queue.
1130          */
1131         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1132
1133         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1134         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1135         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1136         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1137
1138         menuver = *skb->data;
1139         skb_pull(skb, 1);
1140
1141         if (menuver & DN_MENUVER_ACC)
1142                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1143
1144         if (menuver & DN_MENUVER_USR)
1145                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1146
1147         if (menuver & DN_MENUVER_PRX)
1148                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1149
1150         if (menuver & DN_MENUVER_UIC)
1151                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1152
1153         kfree_skb(skb);
1154
1155         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1156                 sizeof(struct optdata_dn));
1157         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1158                 sizeof(struct optdata_dn));
1159
1160         lock_sock(newsk);
1161         err = dn_hash_sock(newsk);
1162         if (err == 0) {
1163                 sock_reset_flag(newsk, SOCK_ZAPPED);
1164                 dn_send_conn_ack(newsk);
1165
1166                 /*
1167                  * Here we use sk->sk_allocation since although the conn conf is
1168                  * for the newsk, the context is the old socket.
1169                  */
1170                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1171                         err = dn_confirm_accept(newsk, &timeo,
1172                                                 sk->sk_allocation);
1173         }
1174         release_sock(newsk);
1175         return err;
1176 }
1177
1178
1179 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1180 {
1181         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1182         struct sock *sk = sock->sk;
1183         struct dn_scp *scp = DN_SK(sk);
1184
1185         *uaddr_len = sizeof(struct sockaddr_dn);
1186
1187         lock_sock(sk);
1188
1189         if (peer) {
1190                 if ((sock->state != SS_CONNECTED &&
1191                      sock->state != SS_CONNECTING) &&
1192                     scp->accept_mode == ACC_IMMED) {
1193                         release_sock(sk);
1194                         return -ENOTCONN;
1195                 }
1196
1197                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1198         } else {
1199                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1200         }
1201
1202         release_sock(sk);
1203
1204         return 0;
1205 }
1206
1207
1208 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1209 {
1210         struct sock *sk = sock->sk;
1211         struct dn_scp *scp = DN_SK(sk);
1212         int mask = datagram_poll(file, sock, wait);
1213
1214         if (!skb_queue_empty(&scp->other_receive_queue))
1215                 mask |= POLLRDBAND;
1216
1217         return mask;
1218 }
1219
1220 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1221 {
1222         struct sock *sk = sock->sk;
1223         struct dn_scp *scp = DN_SK(sk);
1224         int err = -EOPNOTSUPP;
1225         long amount = 0;
1226         struct sk_buff *skb;
1227         int val;
1228
1229         switch(cmd)
1230         {
1231         case SIOCGIFADDR:
1232         case SIOCSIFADDR:
1233                 return dn_dev_ioctl(cmd, (void __user *)arg);
1234
1235         case SIOCATMARK:
1236                 lock_sock(sk);
1237                 val = !skb_queue_empty(&scp->other_receive_queue);
1238                 if (scp->state != DN_RUN)
1239                         val = -ENOTCONN;
1240                 release_sock(sk);
1241                 return val;
1242
1243         case TIOCOUTQ:
1244                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1245                 if (amount < 0)
1246                         amount = 0;
1247                 err = put_user(amount, (int __user *)arg);
1248                 break;
1249
1250         case TIOCINQ:
1251                 lock_sock(sk);
1252                 skb = skb_peek(&scp->other_receive_queue);
1253                 if (skb) {
1254                         amount = skb->len;
1255                 } else {
1256                         skb_queue_walk(&sk->sk_receive_queue, skb)
1257                                 amount += skb->len;
1258                 }
1259                 release_sock(sk);
1260                 err = put_user(amount, (int __user *)arg);
1261                 break;
1262
1263         default:
1264                 err = -ENOIOCTLCMD;
1265                 break;
1266         }
1267
1268         return err;
1269 }
1270
1271 static int dn_listen(struct socket *sock, int backlog)
1272 {
1273         struct sock *sk = sock->sk;
1274         int err = -EINVAL;
1275
1276         lock_sock(sk);
1277
1278         if (sock_flag(sk, SOCK_ZAPPED))
1279                 goto out;
1280
1281         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1282                 goto out;
1283
1284         sk->sk_max_ack_backlog = backlog;
1285         sk->sk_ack_backlog     = 0;
1286         sk->sk_state           = TCP_LISTEN;
1287         err                 = 0;
1288         dn_rehash_sock(sk);
1289
1290 out:
1291         release_sock(sk);
1292
1293         return err;
1294 }
1295
1296
1297 static int dn_shutdown(struct socket *sock, int how)
1298 {
1299         struct sock *sk = sock->sk;
1300         struct dn_scp *scp = DN_SK(sk);
1301         int err = -ENOTCONN;
1302
1303         lock_sock(sk);
1304
1305         if (sock->state == SS_UNCONNECTED)
1306                 goto out;
1307
1308         err = 0;
1309         if (sock->state == SS_DISCONNECTING)
1310                 goto out;
1311
1312         err = -EINVAL;
1313         if (scp->state == DN_O)
1314                 goto out;
1315
1316         if (how != SHUTDOWN_MASK)
1317                 goto out;
1318
1319         sk->sk_shutdown = how;
1320         dn_destroy_sock(sk);
1321         err = 0;
1322
1323 out:
1324         release_sock(sk);
1325
1326         return err;
1327 }
1328
1329 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1330 {
1331         struct sock *sk = sock->sk;
1332         int err;
1333
1334         lock_sock(sk);
1335         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1336         release_sock(sk);
1337
1338         return err;
1339 }
1340
1341 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1342 {
1343         struct  sock *sk = sock->sk;
1344         struct dn_scp *scp = DN_SK(sk);
1345         long timeo;
1346         union {
1347                 struct optdata_dn opt;
1348                 struct accessdata_dn acc;
1349                 int mode;
1350                 unsigned long win;
1351                 int val;
1352                 unsigned char services;
1353                 unsigned char info;
1354         } u;
1355         int err;
1356
1357         if (optlen && !optval)
1358                 return -EINVAL;
1359
1360         if (optlen > sizeof(u))
1361                 return -EINVAL;
1362
1363         if (copy_from_user(&u, optval, optlen))
1364                 return -EFAULT;
1365
1366         switch (optname) {
1367         case DSO_CONDATA:
1368                 if (sock->state == SS_CONNECTED)
1369                         return -EISCONN;
1370                 if ((scp->state != DN_O) && (scp->state != DN_CR))
1371                         return -EINVAL;
1372
1373                 if (optlen != sizeof(struct optdata_dn))
1374                         return -EINVAL;
1375
1376                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1377                         return -EINVAL;
1378
1379                 memcpy(&scp->conndata_out, &u.opt, optlen);
1380                 break;
1381
1382         case DSO_DISDATA:
1383                 if (sock->state != SS_CONNECTED &&
1384                     scp->accept_mode == ACC_IMMED)
1385                         return -ENOTCONN;
1386
1387                 if (optlen != sizeof(struct optdata_dn))
1388                         return -EINVAL;
1389
1390                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1391                         return -EINVAL;
1392
1393                 memcpy(&scp->discdata_out, &u.opt, optlen);
1394                 break;
1395
1396         case DSO_CONACCESS:
1397                 if (sock->state == SS_CONNECTED)
1398                         return -EISCONN;
1399                 if (scp->state != DN_O)
1400                         return -EINVAL;
1401
1402                 if (optlen != sizeof(struct accessdata_dn))
1403                         return -EINVAL;
1404
1405                 if ((u.acc.acc_accl > DN_MAXACCL) ||
1406                     (u.acc.acc_passl > DN_MAXACCL) ||
1407                     (u.acc.acc_userl > DN_MAXACCL))
1408                         return -EINVAL;
1409
1410                 memcpy(&scp->accessdata, &u.acc, optlen);
1411                 break;
1412
1413         case DSO_ACCEPTMODE:
1414                 if (sock->state == SS_CONNECTED)
1415                         return -EISCONN;
1416                 if (scp->state != DN_O)
1417                         return -EINVAL;
1418
1419                 if (optlen != sizeof(int))
1420                         return -EINVAL;
1421
1422                 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1423                         return -EINVAL;
1424
1425                 scp->accept_mode = (unsigned char)u.mode;
1426                 break;
1427
1428         case DSO_CONACCEPT:
1429                 if (scp->state != DN_CR)
1430                         return -EINVAL;
1431                 timeo = sock_rcvtimeo(sk, 0);
1432                 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1433                 return err;
1434
1435         case DSO_CONREJECT:
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                 memset(&link, 0, sizeof(link));
1559
1560                 switch (sock->state) {
1561                 case SS_CONNECTING:
1562                         link.idn_linkstate = LL_CONNECTING;
1563                         break;
1564                 case SS_DISCONNECTING:
1565                         link.idn_linkstate = LL_DISCONNECTING;
1566                         break;
1567                 case SS_CONNECTED:
1568                         link.idn_linkstate = LL_RUNNING;
1569                         break;
1570                 default:
1571                         link.idn_linkstate = LL_INACTIVE;
1572                 }
1573
1574                 link.idn_segsize = scp->segsize_rem;
1575                 r_data = &link;
1576                 break;
1577
1578         default:
1579 #ifdef CONFIG_NETFILTER
1580         {
1581                 int ret, len;
1582
1583                 if (get_user(len, optlen))
1584                         return -EFAULT;
1585
1586                 ret = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1587                 if (ret >= 0)
1588                         ret = put_user(len, optlen);
1589                 return ret;
1590         }
1591 #endif
1592         case DSO_STREAM:
1593         case DSO_SEQPACKET:
1594         case DSO_CONACCEPT:
1595         case DSO_CONREJECT:
1596                 return -ENOPROTOOPT;
1597
1598         case DSO_MAXWINDOW:
1599                 if (r_len > sizeof(unsigned long))
1600                         r_len = sizeof(unsigned long);
1601                 r_data = &scp->max_window;
1602                 break;
1603
1604         case DSO_NODELAY:
1605                 if (r_len > sizeof(int))
1606                         r_len = sizeof(int);
1607                 val = (scp->nonagle == 1);
1608                 r_data = &val;
1609                 break;
1610
1611         case DSO_CORK:
1612                 if (r_len > sizeof(int))
1613                         r_len = sizeof(int);
1614                 val = (scp->nonagle == 2);
1615                 r_data = &val;
1616                 break;
1617
1618         case DSO_SERVICES:
1619                 if (r_len > sizeof(unsigned char))
1620                         r_len = sizeof(unsigned char);
1621                 r_data = &scp->services_rem;
1622                 break;
1623
1624         case DSO_INFO:
1625                 if (r_len > sizeof(unsigned char))
1626                         r_len = sizeof(unsigned char);
1627                 r_data = &scp->info_rem;
1628                 break;
1629         }
1630
1631         if (r_data) {
1632                 if (copy_to_user(optval, r_data, r_len))
1633                         return -EFAULT;
1634                 if (put_user(r_len, optlen))
1635                         return -EFAULT;
1636         }
1637
1638         return 0;
1639 }
1640
1641
1642 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1643 {
1644         struct sk_buff *skb;
1645         int len = 0;
1646
1647         if (flags & MSG_OOB)
1648                 return !skb_queue_empty(q) ? 1 : 0;
1649
1650         skb_queue_walk(q, skb) {
1651                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1652                 len += skb->len;
1653
1654                 if (cb->nsp_flags & 0x40) {
1655                         /* SOCK_SEQPACKET reads to EOM */
1656                         if (sk->sk_type == SOCK_SEQPACKET)
1657                                 return 1;
1658                         /* so does SOCK_STREAM unless WAITALL is specified */
1659                         if (!(flags & MSG_WAITALL))
1660                                 return 1;
1661                 }
1662
1663                 /* minimum data length for read exceeded */
1664                 if (len >= target)
1665                         return 1;
1666         }
1667
1668         return 0;
1669 }
1670
1671
1672 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1673         struct msghdr *msg, size_t size, int flags)
1674 {
1675         struct sock *sk = sock->sk;
1676         struct dn_scp *scp = DN_SK(sk);
1677         struct sk_buff_head *queue = &sk->sk_receive_queue;
1678         size_t target = size > 1 ? 1 : 0;
1679         size_t copied = 0;
1680         int rv = 0;
1681         struct sk_buff *skb, *n;
1682         struct dn_skb_cb *cb = NULL;
1683         unsigned char eor = 0;
1684         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1685
1686         lock_sock(sk);
1687
1688         if (sock_flag(sk, SOCK_ZAPPED)) {
1689                 rv = -EADDRNOTAVAIL;
1690                 goto out;
1691         }
1692
1693         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1694                 rv = 0;
1695                 goto out;
1696         }
1697
1698         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1699         if (rv)
1700                 goto out;
1701
1702         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1703                 rv = -EOPNOTSUPP;
1704                 goto out;
1705         }
1706
1707         if (flags & MSG_OOB)
1708                 queue = &scp->other_receive_queue;
1709
1710         if (flags & MSG_WAITALL)
1711                 target = size;
1712
1713
1714         /*
1715          * See if there is data ready to read, sleep if there isn't
1716          */
1717         for(;;) {
1718                 DEFINE_WAIT(wait);
1719
1720                 if (sk->sk_err)
1721                         goto out;
1722
1723                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1724                         if (!(flags & MSG_OOB)) {
1725                                 msg->msg_flags |= MSG_OOB;
1726                                 if (!scp->other_report) {
1727                                         scp->other_report = 1;
1728                                         goto out;
1729                                 }
1730                         }
1731                 }
1732
1733                 if (scp->state != DN_RUN)
1734                         goto out;
1735
1736                 if (signal_pending(current)) {
1737                         rv = sock_intr_errno(timeo);
1738                         goto out;
1739                 }
1740
1741                 if (dn_data_ready(sk, queue, flags, target))
1742                         break;
1743
1744                 if (flags & MSG_DONTWAIT) {
1745                         rv = -EWOULDBLOCK;
1746                         goto out;
1747                 }
1748
1749                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1750                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1751                 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1752                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1753                 finish_wait(sk_sleep(sk), &wait);
1754         }
1755
1756         skb_queue_walk_safe(queue, skb, n) {
1757                 unsigned int chunk = skb->len;
1758                 cb = DN_SKB_CB(skb);
1759
1760                 if ((chunk + copied) > size)
1761                         chunk = size - copied;
1762
1763                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1764                         rv = -EFAULT;
1765                         break;
1766                 }
1767                 copied += chunk;
1768
1769                 if (!(flags & MSG_PEEK))
1770                         skb_pull(skb, chunk);
1771
1772                 eor = cb->nsp_flags & 0x40;
1773
1774                 if (skb->len == 0) {
1775                         skb_unlink(skb, queue);
1776                         kfree_skb(skb);
1777                         /*
1778                          * N.B. Don't refer to skb or cb after this point
1779                          * in loop.
1780                          */
1781                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1782                                 scp->flowloc_sw = DN_SEND;
1783                                 dn_nsp_send_link(sk, DN_SEND, 0);
1784                         }
1785                 }
1786
1787                 if (eor) {
1788                         if (sk->sk_type == SOCK_SEQPACKET)
1789                                 break;
1790                         if (!(flags & MSG_WAITALL))
1791                                 break;
1792                 }
1793
1794                 if (flags & MSG_OOB)
1795                         break;
1796
1797                 if (copied >= target)
1798                         break;
1799         }
1800
1801         rv = copied;
1802
1803
1804         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1805                 msg->msg_flags |= MSG_EOR;
1806
1807 out:
1808         if (rv == 0)
1809                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1810
1811         if ((rv >= 0) && msg->msg_name) {
1812                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1813                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1814         }
1815
1816         release_sock(sk);
1817
1818         return rv;
1819 }
1820
1821
1822 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1823 {
1824         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1825         if (skb_queue_len(queue) >= scp->snd_window)
1826                 return 1;
1827         if (fctype != NSP_FC_NONE) {
1828                 if (flags & MSG_OOB) {
1829                         if (scp->flowrem_oth == 0)
1830                                 return 1;
1831                 } else {
1832                         if (scp->flowrem_dat == 0)
1833                                 return 1;
1834                 }
1835         }
1836         return 0;
1837 }
1838
1839 /*
1840  * The DECnet spec requires that the "routing layer" accepts packets which
1841  * are at least 230 bytes in size. This excludes any headers which the NSP
1842  * layer might add, so we always assume that we'll be using the maximal
1843  * length header on data packets. The variation in length is due to the
1844  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1845  * make much practical difference.
1846  */
1847 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1848 {
1849         unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1850         if (dev) {
1851                 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1852                 mtu -= LL_RESERVED_SPACE(dev);
1853                 if (dn_db->use_long)
1854                         mtu -= 21;
1855                 else
1856                         mtu -= 6;
1857                 mtu -= DN_MAX_NSP_DATA_HEADER;
1858         } else {
1859                 /*
1860                  * 21 = long header, 16 = guess at MAC header length
1861                  */
1862                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1863         }
1864         if (mtu > mss)
1865                 mss = mtu;
1866         return mss;
1867 }
1868
1869 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1870 {
1871         struct dst_entry *dst = __sk_dst_get(sk);
1872         struct dn_scp *scp = DN_SK(sk);
1873         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1874
1875         /* Other data messages are limited to 16 bytes per packet */
1876         if (flags & MSG_OOB)
1877                 return 16;
1878
1879         /* This works out the maximum size of segment we can send out */
1880         if (dst) {
1881                 u32 mtu = dst_mtu(dst);
1882                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1883         }
1884
1885         return mss_now;
1886 }
1887
1888 /*
1889  * N.B. We get the timeout wrong here, but then we always did get it
1890  * wrong before and this is another step along the road to correcting
1891  * it. It ought to get updated each time we pass through the routine,
1892  * but in practise it probably doesn't matter too much for now.
1893  */
1894 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1895                               unsigned long datalen, int noblock,
1896                               int *errcode)
1897 {
1898         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1899                                                    noblock, errcode);
1900         if (skb) {
1901                 skb->protocol = htons(ETH_P_DNA_RT);
1902                 skb->pkt_type = PACKET_OUTGOING;
1903         }
1904         return skb;
1905 }
1906
1907 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1908                       struct msghdr *msg, size_t size)
1909 {
1910         struct sock *sk = sock->sk;
1911         struct dn_scp *scp = DN_SK(sk);
1912         size_t mss;
1913         struct sk_buff_head *queue = &scp->data_xmit_queue;
1914         int flags = msg->msg_flags;
1915         int err = 0;
1916         size_t sent = 0;
1917         int addr_len = msg->msg_namelen;
1918         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1919         struct sk_buff *skb = NULL;
1920         struct dn_skb_cb *cb;
1921         size_t len;
1922         unsigned char fctype;
1923         long timeo;
1924
1925         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1926                 return -EOPNOTSUPP;
1927
1928         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1929                 return -EINVAL;
1930
1931         lock_sock(sk);
1932         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1933         /*
1934          * The only difference between stream sockets and sequenced packet
1935          * sockets is that the stream sockets always behave as if MSG_EOR
1936          * has been set.
1937          */
1938         if (sock->type == SOCK_STREAM) {
1939                 if (flags & MSG_EOR) {
1940                         err = -EINVAL;
1941                         goto out;
1942                 }
1943                 flags |= MSG_EOR;
1944         }
1945
1946
1947         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1948         if (err)
1949                 goto out_err;
1950
1951         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1952                 err = -EPIPE;
1953                 if (!(flags & MSG_NOSIGNAL))
1954                         send_sig(SIGPIPE, current, 0);
1955                 goto out_err;
1956         }
1957
1958         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1959                 dst_negative_advice(sk);
1960
1961         mss = scp->segsize_rem;
1962         fctype = scp->services_rem & NSP_FC_MASK;
1963
1964         mss = dn_current_mss(sk, flags);
1965
1966         if (flags & MSG_OOB) {
1967                 queue = &scp->other_xmit_queue;
1968                 if (size > mss) {
1969                         err = -EMSGSIZE;
1970                         goto out;
1971                 }
1972         }
1973
1974         scp->persist_fxn = dn_nsp_xmit_timeout;
1975
1976         while(sent < size) {
1977                 err = sock_error(sk);
1978                 if (err)
1979                         goto out;
1980
1981                 if (signal_pending(current)) {
1982                         err = sock_intr_errno(timeo);
1983                         goto out;
1984                 }
1985
1986                 /*
1987                  * Calculate size that we wish to send.
1988                  */
1989                 len = size - sent;
1990
1991                 if (len > mss)
1992                         len = mss;
1993
1994                 /*
1995                  * Wait for queue size to go down below the window
1996                  * size.
1997                  */
1998                 if (dn_queue_too_long(scp, queue, flags)) {
1999                         DEFINE_WAIT(wait);
2000
2001                         if (flags & MSG_DONTWAIT) {
2002                                 err = -EWOULDBLOCK;
2003                                 goto out;
2004                         }
2005
2006                         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2007                         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2008                         sk_wait_event(sk, &timeo,
2009                                       !dn_queue_too_long(scp, queue, flags));
2010                         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2011                         finish_wait(sk_sleep(sk), &wait);
2012                         continue;
2013                 }
2014
2015                 /*
2016                  * Get a suitably sized skb.
2017                  * 64 is a bit of a hack really, but its larger than any
2018                  * link-layer headers and has served us well as a good
2019                  * guess as to their real length.
2020                  */
2021                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2022                                          flags & MSG_DONTWAIT, &err);
2023
2024                 if (err)
2025                         break;
2026
2027                 if (!skb)
2028                         continue;
2029
2030                 cb = DN_SKB_CB(skb);
2031
2032                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2033
2034                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2035                         err = -EFAULT;
2036                         goto out;
2037                 }
2038
2039                 if (flags & MSG_OOB) {
2040                         cb->nsp_flags = 0x30;
2041                         if (fctype != NSP_FC_NONE)
2042                                 scp->flowrem_oth--;
2043                 } else {
2044                         cb->nsp_flags = 0x00;
2045                         if (scp->seg_total == 0)
2046                                 cb->nsp_flags |= 0x20;
2047
2048                         scp->seg_total += len;
2049
2050                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2051                                 cb->nsp_flags |= 0x40;
2052                                 scp->seg_total = 0;
2053                                 if (fctype == NSP_FC_SCMC)
2054                                         scp->flowrem_dat--;
2055                         }
2056                         if (fctype == NSP_FC_SRC)
2057                                 scp->flowrem_dat--;
2058                 }
2059
2060                 sent += len;
2061                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2062                 skb = NULL;
2063
2064                 scp->persist = dn_nsp_persist(sk);
2065
2066         }
2067 out:
2068
2069         kfree_skb(skb);
2070
2071         release_sock(sk);
2072
2073         return sent ? sent : err;
2074
2075 out_err:
2076         err = sk_stream_error(sk, flags, err);
2077         release_sock(sk);
2078         return err;
2079 }
2080
2081 static int dn_device_event(struct notifier_block *this, unsigned long event,
2082                         void *ptr)
2083 {
2084         struct net_device *dev = (struct net_device *)ptr;
2085
2086         if (!net_eq(dev_net(dev), &init_net))
2087                 return NOTIFY_DONE;
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 __read_mostly = {
2110         .type =         cpu_to_be16(ETH_P_DNA_RT),
2111         .func =         dn_route_rcv,
2112 };
2113
2114 #ifdef CONFIG_PROC_FS
2115 struct dn_iter_state {
2116         int bucket;
2117 };
2118
2119 static struct sock *dn_socket_get_first(struct seq_file *seq)
2120 {
2121         struct dn_iter_state *state = seq->private;
2122         struct sock *n = NULL;
2123
2124         for(state->bucket = 0;
2125             state->bucket < DN_SK_HASH_SIZE;
2126             ++state->bucket) {
2127                 n = sk_head(&dn_sk_hash[state->bucket]);
2128                 if (n)
2129                         break;
2130         }
2131
2132         return n;
2133 }
2134
2135 static struct sock *dn_socket_get_next(struct seq_file *seq,
2136                                        struct sock *n)
2137 {
2138         struct dn_iter_state *state = seq->private;
2139
2140         n = sk_next(n);
2141 try_again:
2142         if (n)
2143                 goto out;
2144         if (++state->bucket >= DN_SK_HASH_SIZE)
2145                 goto out;
2146         n = sk_head(&dn_sk_hash[state->bucket]);
2147         goto try_again;
2148 out:
2149         return n;
2150 }
2151
2152 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2153 {
2154         struct sock *sk = dn_socket_get_first(seq);
2155
2156         if (sk) {
2157                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2158                         --*pos;
2159         }
2160         return *pos ? NULL : sk;
2161 }
2162
2163 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2164 {
2165         void *rc;
2166         read_lock_bh(&dn_hash_lock);
2167         rc = socket_get_idx(seq, &pos);
2168         if (!rc) {
2169                 read_unlock_bh(&dn_hash_lock);
2170         }
2171         return rc;
2172 }
2173
2174 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2175 {
2176         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2177 }
2178
2179 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2180 {
2181         void *rc;
2182
2183         if (v == SEQ_START_TOKEN) {
2184                 rc = dn_socket_get_idx(seq, 0);
2185                 goto out;
2186         }
2187
2188         rc = dn_socket_get_next(seq, v);
2189         if (rc)
2190                 goto out;
2191         read_unlock_bh(&dn_hash_lock);
2192 out:
2193         ++*pos;
2194         return rc;
2195 }
2196
2197 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2198 {
2199         if (v && v != SEQ_START_TOKEN)
2200                 read_unlock_bh(&dn_hash_lock);
2201 }
2202
2203 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2204
2205 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2206 {
2207         int i;
2208
2209         switch (le16_to_cpu(dn->sdn_objnamel)) {
2210         case 0:
2211                 sprintf(buf, "%d", dn->sdn_objnum);
2212                 break;
2213         default:
2214                 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2215                         buf[i] = dn->sdn_objname[i];
2216                         if (IS_NOT_PRINTABLE(buf[i]))
2217                                 buf[i] = '.';
2218                 }
2219                 buf[i] = 0;
2220         }
2221 }
2222
2223 static char *dn_state2asc(unsigned char state)
2224 {
2225         switch (state) {
2226         case DN_O:
2227                 return "OPEN";
2228         case DN_CR:
2229                 return "  CR";
2230         case DN_DR:
2231                 return "  DR";
2232         case DN_DRC:
2233                 return " DRC";
2234         case DN_CC:
2235                 return "  CC";
2236         case DN_CI:
2237                 return "  CI";
2238         case DN_NR:
2239                 return "  NR";
2240         case DN_NC:
2241                 return "  NC";
2242         case DN_CD:
2243                 return "  CD";
2244         case DN_RJ:
2245                 return "  RJ";
2246         case DN_RUN:
2247                 return " RUN";
2248         case DN_DI:
2249                 return "  DI";
2250         case DN_DIC:
2251                 return " DIC";
2252         case DN_DN:
2253                 return "  DN";
2254         case DN_CL:
2255                 return "  CL";
2256         case DN_CN:
2257                 return "  CN";
2258         }
2259
2260         return "????";
2261 }
2262
2263 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2264 {
2265         struct dn_scp *scp = DN_SK(sk);
2266         char buf1[DN_ASCBUF_LEN];
2267         char buf2[DN_ASCBUF_LEN];
2268         char local_object[DN_MAXOBJL+3];
2269         char remote_object[DN_MAXOBJL+3];
2270
2271         dn_printable_object(&scp->addr, local_object);
2272         dn_printable_object(&scp->peer, remote_object);
2273
2274         seq_printf(seq,
2275                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2276                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2277                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2278                    scp->addrloc,
2279                    scp->numdat,
2280                    scp->numoth,
2281                    scp->ackxmt_dat,
2282                    scp->ackxmt_oth,
2283                    scp->flowloc_sw,
2284                    local_object,
2285                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2286                    scp->addrrem,
2287                    scp->numdat_rcv,
2288                    scp->numoth_rcv,
2289                    scp->ackrcv_dat,
2290                    scp->ackrcv_oth,
2291                    scp->flowrem_sw,
2292                    remote_object,
2293                    dn_state2asc(scp->state),
2294                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2295 }
2296
2297 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2298 {
2299         if (v == SEQ_START_TOKEN) {
2300                 seq_puts(seq, "Local                                              Remote\n");
2301         } else {
2302                 dn_socket_format_entry(seq, v);
2303         }
2304         return 0;
2305 }
2306
2307 static const struct seq_operations dn_socket_seq_ops = {
2308         .start  = dn_socket_seq_start,
2309         .next   = dn_socket_seq_next,
2310         .stop   = dn_socket_seq_stop,
2311         .show   = dn_socket_seq_show,
2312 };
2313
2314 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2315 {
2316         return seq_open_private(file, &dn_socket_seq_ops,
2317                         sizeof(struct dn_iter_state));
2318 }
2319
2320 static const struct file_operations dn_socket_seq_fops = {
2321         .owner          = THIS_MODULE,
2322         .open           = dn_socket_seq_open,
2323         .read           = seq_read,
2324         .llseek         = seq_lseek,
2325         .release        = seq_release_private,
2326 };
2327 #endif
2328
2329 static const struct net_proto_family    dn_family_ops = {
2330         .family =       AF_DECnet,
2331         .create =       dn_create,
2332         .owner  =       THIS_MODULE,
2333 };
2334
2335 static const struct proto_ops dn_proto_ops = {
2336         .family =       AF_DECnet,
2337         .owner =        THIS_MODULE,
2338         .release =      dn_release,
2339         .bind =         dn_bind,
2340         .connect =      dn_connect,
2341         .socketpair =   sock_no_socketpair,
2342         .accept =       dn_accept,
2343         .getname =      dn_getname,
2344         .poll =         dn_poll,
2345         .ioctl =        dn_ioctl,
2346         .listen =       dn_listen,
2347         .shutdown =     dn_shutdown,
2348         .setsockopt =   dn_setsockopt,
2349         .getsockopt =   dn_getsockopt,
2350         .sendmsg =      dn_sendmsg,
2351         .recvmsg =      dn_recvmsg,
2352         .mmap =         sock_no_mmap,
2353         .sendpage =     sock_no_sendpage,
2354 };
2355
2356 void dn_register_sysctl(void);
2357 void dn_unregister_sysctl(void);
2358
2359 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2360 MODULE_AUTHOR("Linux DECnet Project Team");
2361 MODULE_LICENSE("GPL");
2362 MODULE_ALIAS_NETPROTO(PF_DECnet);
2363
2364 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2365
2366 static int __init decnet_init(void)
2367 {
2368         int rc;
2369
2370         printk(banner);
2371
2372         rc = proto_register(&dn_proto, 1);
2373         if (rc != 0)
2374                 goto out;
2375
2376         dn_neigh_init();
2377         dn_dev_init();
2378         dn_route_init();
2379         dn_fib_init();
2380
2381         sock_register(&dn_family_ops);
2382         dev_add_pack(&dn_dix_packet_type);
2383         register_netdevice_notifier(&dn_dev_notifier);
2384
2385         proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
2386         dn_register_sysctl();
2387 out:
2388         return rc;
2389
2390 }
2391 module_init(decnet_init);
2392
2393 /*
2394  * Prevent DECnet module unloading until its fixed properly.
2395  * Requires an audit of the code to check for memory leaks and
2396  * initialisation problems etc.
2397  */
2398 #if 0
2399 static void __exit decnet_exit(void)
2400 {
2401         sock_unregister(AF_DECnet);
2402         rtnl_unregister_all(PF_DECnet);
2403         dev_remove_pack(&dn_dix_packet_type);
2404
2405         dn_unregister_sysctl();
2406
2407         unregister_netdevice_notifier(&dn_dev_notifier);
2408
2409         dn_route_cleanup();
2410         dn_dev_cleanup();
2411         dn_neigh_cleanup();
2412         dn_fib_cleanup();
2413
2414         proc_net_remove(&init_net, "decnet");
2415
2416         proto_unregister(&dn_proto);
2417
2418         rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2419 }
2420 module_exit(decnet_exit);
2421 #endif