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/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_t decnet_memory_allocated;
 158
 159 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, 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[dn_ntohs(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[dn_ntohs(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(dn_htons(++port)) != 0) {
 198                 if (port == i_port)
 199                         return 0;
 200         }
 201
 202         scp->addrloc = dn_htons(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 hash = addr->sdn_objnum;
 254
 255         if (hash == 0) {
 256                 hash = addr->sdn_objnamel;
 257                 for(i = 0; i < dn_ntohs(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++ = dn_ntohs(sdn->sdn_objnamel);
 300                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
 301                         len = 3 + dn_ntohs(sdn->sdn_objnamel);
 302                         break;
 303                 case 2:
 304                         memset(buf, 0, 5);
 305                         buf += 5;
 306                         *buf++ = dn_ntohs(sdn->sdn_objnamel);
 307                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
 308                         len = 7 + dn_ntohs(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 = dn_htons(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 = dn_htons(*data++);
 364         len -= dn_ntohs(sdn->sdn_objnamel);
 365
 366         if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
 367                 return -1;
 368
 369         memcpy(sdn->sdn_objname, data, dn_ntohs(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, dn_ntohs(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[dn_ntohs(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(xchg(&sk->sk_dst_cache, NULL));
 449 }
 450
 451 static int dn_memory_pressure;
 452
 453 static void dn_enter_memory_pressure(void)
 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 socket *sock, gfp_t gfp)
 474 {
 475         struct dn_scp *scp;
 476         struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
 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, GFP_ATOMIC);
 594                                 return 0;
 595                         }
 596         }
 597
 598         scp->persist = (HZ * decnet_time_wait);
 599
 600         if (sk->sk_socket)
 601                 return 0;
 602
 603         if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
 604                 dn_unhash_sock(sk);
 605                 sock_put(sk);
 606                 return 1;
 607         }
 608
 609         return 0;
 610 }
 611
 612 static void dn_destroy_sock(struct sock *sk)
 613 {
 614         struct dn_scp *scp = DN_SK(sk);
 615
 616         scp->nsp_rxtshift = 0; /* reset back off */
 617
 618         if (sk->sk_socket) {
 619                 if (sk->sk_socket->state != SS_UNCONNECTED)
 620                         sk->sk_socket->state = SS_DISCONNECTING;
 621         }
 622
 623         sk->sk_state = TCP_CLOSE;
 624
 625         switch(scp->state) {
 626                 case DN_DN:
 627                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 628                                          sk->sk_allocation);
 629                         scp->persist_fxn = dn_destroy_timer;
 630                         scp->persist = dn_nsp_persist(sk);
 631                         break;
 632                 case DN_CR:
 633                         scp->state = DN_DR;
 634                         goto disc_reject;
 635                 case DN_RUN:
 636                         scp->state = DN_DI;
 637                 case DN_DI:
 638                 case DN_DR:
 639 disc_reject:
 640                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 641                 case DN_NC:
 642                 case DN_NR:
 643                 case DN_RJ:
 644                 case DN_DIC:
 645                 case DN_CN:
 646                 case DN_DRC:
 647                 case DN_CI:
 648                 case DN_CD:
 649                         scp->persist_fxn = dn_destroy_timer;
 650                         scp->persist = dn_nsp_persist(sk);
 651                         break;
 652                 default:
 653                         printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 654                 case DN_O:
 655                         dn_stop_slow_timer(sk);
 656
 657                         dn_unhash_sock_bh(sk);
 658                         sock_put(sk);
 659
 660                         break;
 661         }
 662 }
 663
 664 char *dn_addr2asc(__u16 addr, char *buf)
 665 {
 666         unsigned short node, area;
 667
 668         node = addr & 0x03ff;
 669         area = addr >> 10;
 670         sprintf(buf, "%hd.%hd", area, node);
 671
 672         return buf;
 673 }
 674
 675
 676
 677 static int dn_create(struct socket *sock, int protocol)
 678 {
 679         struct sock *sk;
 680
 681         switch(sock->type) {
 682                 case SOCK_SEQPACKET:
 683                         if (protocol != DNPROTO_NSP)
 684                                 return -EPROTONOSUPPORT;
 685                         break;
 686                 case SOCK_STREAM:
 687                         break;
 688                 default:
 689                         return -ESOCKTNOSUPPORT;
 690         }
 691
 692
 693         if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
 694                 return -ENOBUFS;
 695
 696         sk->sk_protocol = protocol;
 697
 698         return 0;
 699 }
 700
 701
 702 static int
 703 dn_release(struct socket *sock)
 704 {
 705         struct sock *sk = sock->sk;
 706
 707         if (sk) {
 708                 sock_orphan(sk);
 709                 sock_hold(sk);
 710                 lock_sock(sk);
 711                 dn_destroy_sock(sk);
 712                 release_sock(sk);
 713                 sock_put(sk);
 714         }
 715
 716         return 0;
 717 }
 718
 719 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 720 {
 721         struct sock *sk = sock->sk;
 722         struct dn_scp *scp = DN_SK(sk);
 723         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 724         struct net_device *dev;
 725         int rv;
 726
 727         if (addr_len != sizeof(struct sockaddr_dn))
 728                 return -EINVAL;
 729
 730         if (saddr->sdn_family != AF_DECnet)
 731                 return -EINVAL;
 732
 733         if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
 734                 return -EINVAL;
 735
 736         if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
 737                 return -EINVAL;
 738
 739         if (saddr->sdn_flags & ~SDF_WILD)
 740                 return -EINVAL;
 741
 742         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 743             (saddr->sdn_flags & SDF_WILD)))
 744                 return -EACCES;
 745
 746         if (!(saddr->sdn_flags & SDF_WILD)) {
 747                 if (dn_ntohs(saddr->sdn_nodeaddrl)) {
 748                         read_lock(&dev_base_lock);
 749                         for(dev = dev_base; dev; dev = dev->next) {
 750                                 if (!dev->dn_ptr)
 751                                         continue;
 752                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
 753                                         break;
 754                         }
 755                         read_unlock(&dev_base_lock);
 756                         if (dev == NULL)
 757                                 return -EADDRNOTAVAIL;
 758                 }
 759         }
 760
 761         rv = -EINVAL;
 762         lock_sock(sk);
 763         if (sock_flag(sk, SOCK_ZAPPED)) {
 764                 memcpy(&scp->addr, saddr, addr_len);
 765                 sock_reset_flag(sk, SOCK_ZAPPED);
 766
 767                 rv = dn_hash_sock(sk);
 768                 if (rv)
 769                         sock_set_flag(sk, SOCK_ZAPPED);
 770         }
 771         release_sock(sk);
 772
 773         return rv;
 774 }
 775
 776
 777 static int dn_auto_bind(struct socket *sock)
 778 {
 779         struct sock *sk = sock->sk;
 780         struct dn_scp *scp = DN_SK(sk);
 781         int rv;
 782
 783         sock_reset_flag(sk, SOCK_ZAPPED);
 784
 785         scp->addr.sdn_flags  = 0;
 786         scp->addr.sdn_objnum = 0;
 787
 788         /*
 789          * This stuff is to keep compatibility with Eduardo's
 790          * patch. I hope I can dispense with it shortly...
 791          */
 792         if ((scp->accessdata.acc_accl != 0) &&
 793                 (scp->accessdata.acc_accl <= 12)) {
 794
 795                 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
 796                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
 797
 798                 scp->accessdata.acc_accl = 0;
 799                 memset(scp->accessdata.acc_acc, 0, 40);
 800         }
 801         /* End of compatibility stuff */
 802
 803         scp->addr.sdn_add.a_len = dn_htons(2);
 804         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 805         if (rv == 0) {
 806                 rv = dn_hash_sock(sk);
 807                 if (rv)
 808                         sock_set_flag(sk, SOCK_ZAPPED);
 809         }
 810
 811         return rv;
 812 }
 813
 814 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 815 {
 816         struct dn_scp *scp = DN_SK(sk);
 817         DEFINE_WAIT(wait);
 818         int err;
 819
 820         if (scp->state != DN_CR)
 821                 return -EINVAL;
 822
 823         scp->state = DN_CC;
 824         scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
 825         dn_send_conn_conf(sk, allocation);
 826
 827         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 828         for(;;) {
 829                 release_sock(sk);
 830                 if (scp->state == DN_CC)
 831                         *timeo = schedule_timeout(*timeo);
 832                 lock_sock(sk);
 833                 err = 0;
 834                 if (scp->state == DN_RUN)
 835                         break;
 836                 err = sock_error(sk);
 837                 if (err)
 838                         break;
 839                 err = sock_intr_errno(*timeo);
 840                 if (signal_pending(current))
 841                         break;
 842                 err = -EAGAIN;
 843                 if (!*timeo)
 844                         break;
 845                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 846         }
 847         finish_wait(sk->sk_sleep, &wait);
 848         if (err == 0) {
 849                 sk->sk_socket->state = SS_CONNECTED;
 850         } else if (scp->state != DN_CC) {
 851                 sk->sk_socket->state = SS_UNCONNECTED;
 852         }
 853         return err;
 854 }
 855
 856 static int dn_wait_run(struct sock *sk, long *timeo)
 857 {
 858         struct dn_scp *scp = DN_SK(sk);
 859         DEFINE_WAIT(wait);
 860         int err = 0;
 861
 862         if (scp->state == DN_RUN)
 863                 goto out;
 864
 865         if (!*timeo)
 866                 return -EALREADY;
 867
 868         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 869         for(;;) {
 870                 release_sock(sk);
 871                 if (scp->state == DN_CI || scp->state == DN_CC)
 872                         *timeo = schedule_timeout(*timeo);
 873                 lock_sock(sk);
 874                 err = 0;
 875                 if (scp->state == DN_RUN)
 876                         break;
 877                 err = sock_error(sk);
 878                 if (err)
 879                         break;
 880                 err = sock_intr_errno(*timeo);
 881                 if (signal_pending(current))
 882                         break;
 883                 err = -ETIMEDOUT;
 884                 if (!*timeo)
 885                         break;
 886                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 887         }
 888         finish_wait(sk->sk_sleep, &wait);
 889 out:
 890         if (err == 0) {
 891                 sk->sk_socket->state = SS_CONNECTED;
 892         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 893                 sk->sk_socket->state = SS_UNCONNECTED;
 894         }
 895         return err;
 896 }
 897
 898 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 899 {
 900         struct socket *sock = sk->sk_socket;
 901         struct dn_scp *scp = DN_SK(sk);
 902         int err = -EISCONN;
 903         struct flowi fl;
 904
 905         if (sock->state == SS_CONNECTED)
 906                 goto out;
 907
 908         if (sock->state == SS_CONNECTING) {
 909                 err = 0;
 910                 if (scp->state == DN_RUN) {
 911                         sock->state = SS_CONNECTED;
 912                         goto out;
 913                 }
 914                 err = -ECONNREFUSED;
 915                 if (scp->state != DN_CI && scp->state != DN_CC) {
 916                         sock->state = SS_UNCONNECTED;
 917                         goto out;
 918                 }
 919                 return dn_wait_run(sk, timeo);
 920         }
 921
 922         err = -EINVAL;
 923         if (scp->state != DN_O)
 924                 goto out;
 925
 926         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 927                 goto out;
 928         if (addr->sdn_family != AF_DECnet)
 929                 goto out;
 930         if (addr->sdn_flags & SDF_WILD)
 931                 goto out;
 932
 933         if (sock_flag(sk, SOCK_ZAPPED)) {
 934                 err = dn_auto_bind(sk->sk_socket);
 935                 if (err)
 936                         goto out;
 937         }
 938
 939         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 940
 941         err = -EHOSTUNREACH;
 942         memset(&fl, 0, sizeof(fl));
 943         fl.oif = sk->sk_bound_dev_if;
 944         fl.fld_dst = dn_saddr2dn(&scp->peer);
 945         fl.fld_src = dn_saddr2dn(&scp->addr);
 946         dn_sk_ports_copy(&fl, scp);
 947         fl.proto = DNPROTO_NSP;
 948         if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
 949                 goto out;
 950         sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 951         sock->state = SS_CONNECTING;
 952         scp->state = DN_CI;
 953         scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
 954
 955         dn_nsp_send_conninit(sk, NSP_CI);
 956         err = -EINPROGRESS;
 957         if (*timeo) {
 958                 err = dn_wait_run(sk, timeo);
 959         }
 960 out:
 961         return err;
 962 }
 963
 964 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 965 {
 966         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 967         struct sock *sk = sock->sk;
 968         int err;
 969         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 970
 971         lock_sock(sk);
 972         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 973         release_sock(sk);
 974
 975         return err;
 976 }
 977
 978 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 979 {
 980         struct dn_scp *scp = DN_SK(sk);
 981
 982         switch(scp->state) {
 983                 case DN_RUN:
 984                         return 0;
 985                 case DN_CR:
 986                         return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 987                 case DN_CI:
 988                 case DN_CC:
 989                         return dn_wait_run(sk, timeo);
 990                 case DN_O:
 991                         return __dn_connect(sk, addr, addrlen, timeo, flags);
 992         }
 993
 994         return -EINVAL;
 995 }
 996
 997
 998 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
 999 {
1000         unsigned char *ptr = skb->data;
1001
1002         acc->acc_userl = *ptr++;
1003         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1004         ptr += acc->acc_userl;
1005
1006         acc->acc_passl = *ptr++;
1007         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1008         ptr += acc->acc_passl;
1009
1010         acc->acc_accl = *ptr++;
1011         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1012
1013         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1014
1015 }
1016
1017 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1018 {
1019         unsigned char *ptr = skb->data;
1020         u16 len = *ptr++; /* yes, it's 8bit on the wire */
1021
1022         BUG_ON(len > 16); /* we've checked the contents earlier */
1023         opt->opt_optl   = dn_htons(len);
1024         opt->opt_status = 0;
1025         memcpy(opt->opt_data, ptr, len);
1026         skb_pull(skb, len + 1);
1027 }
1028
1029 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1030 {
1031         DEFINE_WAIT(wait);
1032         struct sk_buff *skb = NULL;
1033         int err = 0;
1034
1035         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1036         for(;;) {
1037                 release_sock(sk);
1038                 skb = skb_dequeue(&sk->sk_receive_queue);
1039                 if (skb == NULL) {
1040                         *timeo = schedule_timeout(*timeo);
1041                         skb = skb_dequeue(&sk->sk_receive_queue);
1042                 }
1043                 lock_sock(sk);
1044                 if (skb != NULL)
1045                         break;
1046                 err = -EINVAL;
1047                 if (sk->sk_state != TCP_LISTEN)
1048                         break;
1049                 err = sock_intr_errno(*timeo);
1050                 if (signal_pending(current))
1051                         break;
1052                 err = -EAGAIN;
1053                 if (!*timeo)
1054                         break;
1055                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1056         }
1057         finish_wait(sk->sk_sleep, &wait);
1058
1059         return skb == NULL ? ERR_PTR(err) : skb;
1060 }
1061
1062 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1063 {
1064         struct sock *sk = sock->sk, *newsk;
1065         struct sk_buff *skb = NULL;
1066         struct dn_skb_cb *cb;
1067         unsigned char menuver;
1068         int err = 0;
1069         unsigned char type;
1070         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1071
1072         lock_sock(sk);
1073
1074         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1075                 release_sock(sk);
1076                 return -EINVAL;
1077         }
1078
1079         skb = skb_dequeue(&sk->sk_receive_queue);
1080         if (skb == NULL) {
1081                 skb = dn_wait_for_connect(sk, &timeo);
1082                 if (IS_ERR(skb)) {
1083                         release_sock(sk);
1084                         return PTR_ERR(skb);
1085                 }
1086         }
1087
1088         cb = DN_SKB_CB(skb);
1089         sk->sk_ack_backlog--;
1090         newsk = dn_alloc_sock(newsock, sk->sk_allocation);
1091         if (newsk == NULL) {
1092                 release_sock(sk);
1093                 kfree_skb(skb);
1094                 return -ENOBUFS;
1095         }
1096         release_sock(sk);
1097
1098         dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1099         skb->dst = NULL;
1100
1101         DN_SK(newsk)->state        = DN_CR;
1102         DN_SK(newsk)->addrrem      = cb->src_port;
1103         DN_SK(newsk)->services_rem = cb->services;
1104         DN_SK(newsk)->info_rem     = cb->info;
1105         DN_SK(newsk)->segsize_rem  = cb->segsize;
1106         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1107
1108         if (DN_SK(newsk)->segsize_rem < 230)
1109                 DN_SK(newsk)->segsize_rem = 230;
1110
1111         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1112                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1113
1114         newsk->sk_state  = TCP_LISTEN;
1115         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1116
1117         /*
1118          * If we are listening on a wild socket, we don't want
1119          * the newly created socket on the wrong hash queue.
1120          */
1121         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1122
1123         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1124         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1125         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1126         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1127
1128         menuver = *skb->data;
1129         skb_pull(skb, 1);
1130
1131         if (menuver & DN_MENUVER_ACC)
1132                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1133
1134         if (menuver & DN_MENUVER_USR)
1135                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1136
1137         if (menuver & DN_MENUVER_PRX)
1138                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1139
1140         if (menuver & DN_MENUVER_UIC)
1141                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1142
1143         kfree_skb(skb);
1144
1145         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1146                 sizeof(struct optdata_dn));
1147         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1148                 sizeof(struct optdata_dn));
1149
1150         lock_sock(newsk);
1151         err = dn_hash_sock(newsk);
1152         if (err == 0) {
1153                 sock_reset_flag(newsk, SOCK_ZAPPED);
1154                 dn_send_conn_ack(newsk);
1155
1156                 /*
1157                  * Here we use sk->sk_allocation since although the conn conf is
1158                  * for the newsk, the context is the old socket.
1159                  */
1160                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1161                         err = dn_confirm_accept(newsk, &timeo,
1162                                                 sk->sk_allocation);
1163         }
1164         release_sock(newsk);
1165         return err;
1166 }
1167
1168
1169 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1170 {
1171         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1172         struct sock *sk = sock->sk;
1173         struct dn_scp *scp = DN_SK(sk);
1174
1175         *uaddr_len = sizeof(struct sockaddr_dn);
1176
1177         lock_sock(sk);
1178
1179         if (peer) {
1180                 if ((sock->state != SS_CONNECTED &&
1181                      sock->state != SS_CONNECTING) &&
1182                     scp->accept_mode == ACC_IMMED) {
1183                         release_sock(sk);
1184                         return -ENOTCONN;
1185                 }
1186
1187                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1188         } else {
1189                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1190         }
1191
1192         release_sock(sk);
1193
1194         return 0;
1195 }
1196
1197
1198 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1199 {
1200         struct sock *sk = sock->sk;
1201         struct dn_scp *scp = DN_SK(sk);
1202         int mask = datagram_poll(file, sock, wait);
1203
1204         if (!skb_queue_empty(&scp->other_receive_queue))
1205                 mask |= POLLRDBAND;
1206
1207         return mask;
1208 }
1209
1210 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1211 {
1212         struct sock *sk = sock->sk;
1213         struct dn_scp *scp = DN_SK(sk);
1214         int err = -EOPNOTSUPP;
1215         long amount = 0;
1216         struct sk_buff *skb;
1217         int val;
1218
1219         switch(cmd)
1220         {
1221         case SIOCGIFADDR:
1222         case SIOCSIFADDR:
1223                 return dn_dev_ioctl(cmd, (void __user *)arg);
1224
1225         case SIOCATMARK:
1226                 lock_sock(sk);
1227                 val = !skb_queue_empty(&scp->other_receive_queue);
1228                 if (scp->state != DN_RUN)
1229                         val = -ENOTCONN;
1230                 release_sock(sk);
1231                 return val;
1232
1233         case TIOCOUTQ:
1234                 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1235                 if (amount < 0)
1236                         amount = 0;
1237                 err = put_user(amount, (int __user *)arg);
1238                 break;
1239
1240         case TIOCINQ:
1241                 lock_sock(sk);
1242                 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1243                         amount = skb->len;
1244                 } else {
1245                         struct sk_buff *skb = sk->sk_receive_queue.next;
1246                         for(;;) {
1247                                 if (skb ==
1248                                     (struct sk_buff *)&sk->sk_receive_queue)
1249                                         break;
1250                                 amount += skb->len;
1251                                 skb = skb->next;
1252                         }
1253                 }
1254                 release_sock(sk);
1255                 err = put_user(amount, (int __user *)arg);
1256                 break;
1257
1258         default:
1259                 err = -ENOIOCTLCMD;
1260                 break;
1261         }
1262
1263         return err;
1264 }
1265
1266 static int dn_listen(struct socket *sock, int backlog)
1267 {
1268         struct sock *sk = sock->sk;
1269         int err = -EINVAL;
1270
1271         lock_sock(sk);
1272
1273         if (sock_flag(sk, SOCK_ZAPPED))
1274                 goto out;
1275
1276         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1277                 goto out;
1278
1279         sk->sk_max_ack_backlog = backlog;
1280         sk->sk_ack_backlog     = 0;
1281         sk->sk_state           = TCP_LISTEN;
1282         err                 = 0;
1283         dn_rehash_sock(sk);
1284
1285 out:
1286         release_sock(sk);
1287
1288         return err;
1289 }
1290
1291
1292 static int dn_shutdown(struct socket *sock, int how)
1293 {
1294         struct sock *sk = sock->sk;
1295         struct dn_scp *scp = DN_SK(sk);
1296         int err = -ENOTCONN;
1297
1298         lock_sock(sk);
1299
1300         if (sock->state == SS_UNCONNECTED)
1301                 goto out;
1302
1303         err = 0;
1304         if (sock->state == SS_DISCONNECTING)
1305                 goto out;
1306
1307         err = -EINVAL;
1308         if (scp->state == DN_O)
1309                 goto out;
1310
1311         if (how != SHUTDOWN_MASK)
1312                 goto out;
1313
1314         sk->sk_shutdown = how;
1315         dn_destroy_sock(sk);
1316         err = 0;
1317
1318 out:
1319         release_sock(sk);
1320
1321         return err;
1322 }
1323
1324 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1325 {
1326         struct sock *sk = sock->sk;
1327         int err;
1328
1329         lock_sock(sk);
1330         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1331         release_sock(sk);
1332
1333         return err;
1334 }
1335
1336 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1337 {
1338         struct  sock *sk = sock->sk;
1339         struct dn_scp *scp = DN_SK(sk);
1340         long timeo;
1341         union {
1342                 struct optdata_dn opt;
1343                 struct accessdata_dn acc;
1344                 int mode;
1345                 unsigned long win;
1346                 int val;
1347                 unsigned char services;
1348                 unsigned char info;
1349         } u;
1350         int err;
1351
1352         if (optlen && !optval)
1353                 return -EINVAL;
1354
1355         if (optlen > sizeof(u))
1356                 return -EINVAL;
1357
1358         if (copy_from_user(&u, optval, optlen))
1359                 return -EFAULT;
1360
1361         switch(optname) {
1362                 case DSO_CONDATA:
1363                         if (sock->state == SS_CONNECTED)
1364                                 return -EISCONN;
1365                         if ((scp->state != DN_O) && (scp->state != DN_CR))
1366                                 return -EINVAL;
1367
1368                         if (optlen != sizeof(struct optdata_dn))
1369                                 return -EINVAL;
1370
1371                         if (dn_ntohs(u.opt.opt_optl) > 16)
1372                                 return -EINVAL;
1373
1374                         memcpy(&scp->conndata_out, &u.opt, optlen);
1375                         break;
1376
1377                 case DSO_DISDATA:
1378                         if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1379                                 return -ENOTCONN;
1380
1381                         if (optlen != sizeof(struct optdata_dn))
1382                                 return -EINVAL;
1383
1384                         if (dn_ntohs(u.opt.opt_optl) > 16)
1385                                 return -EINVAL;
1386
1387                         memcpy(&scp->discdata_out, &u.opt, optlen);
1388                         break;
1389
1390                 case DSO_CONACCESS:
1391                         if (sock->state == SS_CONNECTED)
1392                                 return -EISCONN;
1393                         if (scp->state != DN_O)
1394                                 return -EINVAL;
1395
1396                         if (optlen != sizeof(struct accessdata_dn))
1397                                 return -EINVAL;
1398
1399                         if ((u.acc.acc_accl > DN_MAXACCL) ||
1400                                         (u.acc.acc_passl > DN_MAXACCL) ||
1401                                         (u.acc.acc_userl > DN_MAXACCL))
1402                                 return -EINVAL;
1403
1404                         memcpy(&scp->accessdata, &u.acc, optlen);
1405                         break;
1406
1407                 case DSO_ACCEPTMODE:
1408                         if (sock->state == SS_CONNECTED)
1409                                 return -EISCONN;
1410                         if (scp->state != DN_O)
1411                                 return -EINVAL;
1412
1413                         if (optlen != sizeof(int))
1414                                 return -EINVAL;
1415
1416                         if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1417                                 return -EINVAL;
1418
1419                         scp->accept_mode = (unsigned char)u.mode;
1420                         break;
1421
1422                 case DSO_CONACCEPT:
1423
1424                         if (scp->state != DN_CR)
1425                                 return -EINVAL;
1426                         timeo = sock_rcvtimeo(sk, 0);
1427                         err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1428                         return err;
1429
1430                 case DSO_CONREJECT:
1431
1432                         if (scp->state != DN_CR)
1433                                 return -EINVAL;
1434
1435                         scp->state = DN_DR;
1436                         sk->sk_shutdown = SHUTDOWN_MASK;
1437                         dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1438                         break;
1439
1440                 default:
1441 #ifdef CONFIG_NETFILTER
1442                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1443 #endif
1444                 case DSO_LINKINFO:
1445                 case DSO_STREAM:
1446                 case DSO_SEQPACKET:
1447                         return -ENOPROTOOPT;
1448
1449                 case DSO_MAXWINDOW:
1450                         if (optlen != sizeof(unsigned long))
1451                                 return -EINVAL;
1452                         if (u.win > NSP_MAX_WINDOW)
1453                                 u.win = NSP_MAX_WINDOW;
1454                         if (u.win == 0)
1455                                 return -EINVAL;
1456                         scp->max_window = u.win;
1457                         if (scp->snd_window > u.win)
1458                                 scp->snd_window = u.win;
1459                         break;
1460
1461                 case DSO_NODELAY:
1462                         if (optlen != sizeof(int))
1463                                 return -EINVAL;
1464                         if (scp->nonagle == 2)
1465                                 return -EINVAL;
1466                         scp->nonagle = (u.val == 0) ? 0 : 1;
1467                         /* if (scp->nonagle == 1) { Push pending frames } */
1468                         break;
1469
1470                 case DSO_CORK:
1471                         if (optlen != sizeof(int))
1472                                 return -EINVAL;
1473                         if (scp->nonagle == 1)
1474                                 return -EINVAL;
1475                         scp->nonagle = (u.val == 0) ? 0 : 2;
1476                         /* if (scp->nonagle == 0) { Push pending frames } */
1477                         break;
1478
1479                 case DSO_SERVICES:
1480                         if (optlen != sizeof(unsigned char))
1481                                 return -EINVAL;
1482                         if ((u.services & ~NSP_FC_MASK) != 0x01)
1483                                 return -EINVAL;
1484                         if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1485                                 return -EINVAL;
1486                         scp->services_loc = u.services;
1487                         break;
1488
1489                 case DSO_INFO:
1490                         if (optlen != sizeof(unsigned char))
1491                                 return -EINVAL;
1492                         if (u.info & 0xfc)
1493                                 return -EINVAL;
1494                         scp->info_loc = u.info;
1495                         break;
1496         }
1497
1498         return 0;
1499 }
1500
1501 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1502 {
1503         struct sock *sk = sock->sk;
1504         int err;
1505
1506         lock_sock(sk);
1507         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1508         release_sock(sk);
1509
1510         return err;
1511 }
1512
1513 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1514 {
1515         struct  sock *sk = sock->sk;
1516         struct dn_scp *scp = DN_SK(sk);
1517         struct linkinfo_dn link;
1518         unsigned int r_len;
1519         void *r_data = NULL;
1520         unsigned int val;
1521
1522         if(get_user(r_len , optlen))
1523                 return -EFAULT;
1524
1525         switch(optname) {
1526                 case DSO_CONDATA:
1527                         if (r_len > sizeof(struct optdata_dn))
1528                                 r_len = sizeof(struct optdata_dn);
1529                         r_data = &scp->conndata_in;
1530                         break;
1531
1532                 case DSO_DISDATA:
1533                         if (r_len > sizeof(struct optdata_dn))
1534                                 r_len = sizeof(struct optdata_dn);
1535                         r_data = &scp->discdata_in;
1536                         break;
1537
1538                 case DSO_CONACCESS:
1539                         if (r_len > sizeof(struct accessdata_dn))
1540                                 r_len = sizeof(struct accessdata_dn);
1541                         r_data = &scp->accessdata;
1542                         break;
1543
1544                 case DSO_ACCEPTMODE:
1545                         if (r_len > sizeof(unsigned char))
1546                                 r_len = sizeof(unsigned char);
1547                         r_data = &scp->accept_mode;
1548                         break;
1549
1550                 case DSO_LINKINFO:
1551                         if (r_len > sizeof(struct linkinfo_dn))
1552                                 r_len = sizeof(struct linkinfo_dn);
1553
1554                         switch(sock->state) {
1555                                 case SS_CONNECTING:
1556                                         link.idn_linkstate = LL_CONNECTING;
1557                                         break;
1558                                 case SS_DISCONNECTING:
1559                                         link.idn_linkstate = LL_DISCONNECTING;
1560                                         break;
1561                                 case SS_CONNECTED:
1562                                         link.idn_linkstate = LL_RUNNING;
1563                                         break;
1564                                 default:
1565                                         link.idn_linkstate = LL_INACTIVE;
1566                         }
1567
1568                         link.idn_segsize = scp->segsize_rem;
1569                         r_data = &link;
1570                         break;
1571
1572                 default:
1573 #ifdef CONFIG_NETFILTER
1574                 {
1575                         int val, len;
1576
1577                         if(get_user(len, optlen))
1578                                 return -EFAULT;
1579
1580                         val = nf_getsockopt(sk, PF_DECnet, optname,
1581                                                         optval, &len);
1582                         if (val >= 0)
1583                                 val = put_user(len, optlen);
1584                         return val;
1585                 }
1586 #endif
1587                 case DSO_STREAM:
1588                 case DSO_SEQPACKET:
1589                 case DSO_CONACCEPT:
1590                 case DSO_CONREJECT:
1591                         return -ENOPROTOOPT;
1592
1593                 case DSO_MAXWINDOW:
1594                         if (r_len > sizeof(unsigned long))
1595                                 r_len = sizeof(unsigned long);
1596                         r_data = &scp->max_window;
1597                         break;
1598
1599                 case DSO_NODELAY:
1600                         if (r_len > sizeof(int))
1601                                 r_len = sizeof(int);
1602                         val = (scp->nonagle == 1);
1603                         r_data = &val;
1604                         break;
1605
1606                 case DSO_CORK:
1607                         if (r_len > sizeof(int))
1608                                 r_len = sizeof(int);
1609                         val = (scp->nonagle == 2);
1610                         r_data = &val;
1611                         break;
1612
1613                 case DSO_SERVICES:
1614                         if (r_len > sizeof(unsigned char))
1615                                 r_len = sizeof(unsigned char);
1616                         r_data = &scp->services_rem;
1617                         break;
1618
1619                 case DSO_INFO:
1620                         if (r_len > sizeof(unsigned char))
1621                                 r_len = sizeof(unsigned char);
1622                         r_data = &scp->info_rem;
1623                         break;
1624         }
1625
1626         if (r_data) {
1627                 if (copy_to_user(optval, r_data, r_len))
1628                         return -EFAULT;
1629                 if (put_user(r_len, optlen))
1630                         return -EFAULT;
1631         }
1632
1633         return 0;
1634 }
1635
1636
1637 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1638 {
1639         struct sk_buff *skb = q->next;
1640         int len = 0;
1641
1642         if (flags & MSG_OOB)
1643                 return !skb_queue_empty(q) ? 1 : 0;
1644
1645         while(skb != (struct sk_buff *)q) {
1646                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1647                 len += skb->len;
1648
1649                 if (cb->nsp_flags & 0x40) {
1650                         /* SOCK_SEQPACKET reads to EOM */
1651                         if (sk->sk_type == SOCK_SEQPACKET)
1652                                 return 1;
1653                         /* so does SOCK_STREAM unless WAITALL is specified */
1654                         if (!(flags & MSG_WAITALL))
1655                                 return 1;
1656                 }
1657
1658                 /* minimum data length for read exceeded */
1659                 if (len >= target)
1660                         return 1;
1661
1662                 skb = skb->next;
1663         }
1664
1665         return 0;
1666 }
1667
1668
1669 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1670         struct msghdr *msg, size_t size, int flags)
1671 {
1672         struct sock *sk = sock->sk;
1673         struct dn_scp *scp = DN_SK(sk);
1674         struct sk_buff_head *queue = &sk->sk_receive_queue;
1675         size_t target = size > 1 ? 1 : 0;
1676         size_t copied = 0;
1677         int rv = 0;
1678         struct sk_buff *skb, *nskb;
1679         struct dn_skb_cb *cb = NULL;
1680         unsigned char eor = 0;
1681         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1682
1683         lock_sock(sk);
1684
1685         if (sock_flag(sk, SOCK_ZAPPED)) {
1686                 rv = -EADDRNOTAVAIL;
1687                 goto out;
1688         }
1689
1690         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1691                 rv = 0;
1692                 goto out;
1693         }
1694
1695         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1696         if (rv)
1697                 goto out;
1698
1699         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1700                 rv = -EOPNOTSUPP;
1701                 goto out;
1702         }
1703
1704         if (flags & MSG_OOB)
1705                 queue = &scp->other_receive_queue;
1706
1707         if (flags & MSG_WAITALL)
1708                 target = size;
1709
1710
1711         /*
1712          * See if there is data ready to read, sleep if there isn't
1713          */
1714         for(;;) {
1715                 if (sk->sk_err)
1716                         goto out;
1717
1718                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1719                         if (!(flags & MSG_OOB)) {
1720                                 msg->msg_flags |= MSG_OOB;
1721                                 if (!scp->other_report) {
1722                                         scp->other_report = 1;
1723                                         goto out;
1724                                 }
1725                         }
1726                 }
1727
1728                 if (scp->state != DN_RUN)
1729                         goto out;
1730
1731                 if (signal_pending(current)) {
1732                         rv = sock_intr_errno(timeo);
1733                         goto out;
1734                 }
1735
1736                 if (dn_data_ready(sk, queue, flags, target))
1737                         break;
1738
1739                 if (flags & MSG_DONTWAIT) {
1740                         rv = -EWOULDBLOCK;
1741                         goto out;
1742                 }
1743
1744                 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1745                 SOCK_SLEEP_PRE(sk)
1746
1747                 if (!dn_data_ready(sk, queue, flags, target))
1748                         schedule();
1749
1750                 SOCK_SLEEP_POST(sk)
1751                 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1752         }
1753
1754         for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1755                 unsigned int chunk = skb->len;
1756                 cb = DN_SKB_CB(skb);
1757
1758                 if ((chunk + copied) > size)
1759                         chunk = size - copied;
1760
1761                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1762                         rv = -EFAULT;
1763                         break;
1764                 }
1765                 copied += chunk;
1766
1767                 if (!(flags & MSG_PEEK))
1768                         skb_pull(skb, chunk);
1769
1770                 eor = cb->nsp_flags & 0x40;
1771                 nskb = skb->next;
1772
1773                 if (skb->len == 0) {
1774                         skb_unlink(skb, queue);
1775                         kfree_skb(skb);
1776                         /*
1777                          * N.B. Don't refer to skb or cb after this point
1778                          * in loop.
1779                          */
1780                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1781                                 scp->flowloc_sw = DN_SEND;
1782                                 dn_nsp_send_link(sk, DN_SEND, 0);
1783                         }
1784                 }
1785
1786                 if (eor) {
1787                         if (sk->sk_type == SOCK_SEQPACKET)
1788                                 break;
1789                         if (!(flags & MSG_WAITALL))
1790                                 break;
1791                 }
1792
1793                 if (flags & MSG_OOB)
1794                         break;
1795
1796                 if (copied >= target)
1797                         break;
1798         }
1799
1800         rv = copied;
1801
1802
1803         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1804                 msg->msg_flags |= MSG_EOR;
1805
1806 out:
1807         if (rv == 0)
1808                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1809
1810         if ((rv >= 0) && msg->msg_name) {
1811                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1812                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1813         }
1814
1815         release_sock(sk);
1816
1817         return rv;
1818 }
1819
1820
1821 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1822 {
1823         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1824         if (skb_queue_len(queue) >= scp->snd_window)
1825                 return 1;
1826         if (fctype != NSP_FC_NONE) {
1827                 if (flags & MSG_OOB) {
1828                         if (scp->flowrem_oth == 0)
1829                                 return 1;
1830                 } else {
1831                         if (scp->flowrem_dat == 0)
1832                                 return 1;
1833                 }
1834         }
1835         return 0;
1836 }
1837
1838 /*
1839  * The DECnet spec requires the the "routing layer" accepts packets which
1840  * are at least 230 bytes in size. This excludes any headers which the NSP
1841  * layer might add, so we always assume that we'll be using the maximal
1842  * length header on data packets. The variation in length is due to the
1843  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1844  * make much practical difference.
1845  */
1846 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1847 {
1848         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1849         if (dev) {
1850                 struct dn_dev *dn_db = dev->dn_ptr;
1851                 mtu -= LL_RESERVED_SPACE(dev);
1852                 if (dn_db->use_long)
1853                         mtu -= 21;
1854                 else
1855                         mtu -= 6;
1856                 mtu -= DN_MAX_NSP_DATA_HEADER;
1857         } else {
1858                 /*
1859                  * 21 = long header, 16 = guess at MAC header length
1860                  */
1861                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1862         }
1863         if (mtu > mss)
1864                 mss = mtu;
1865         return mss;
1866 }
1867
1868 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1869 {
1870         struct dst_entry *dst = __sk_dst_get(sk);
1871         struct dn_scp *scp = DN_SK(sk);
1872         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1873
1874         /* Other data messages are limited to 16 bytes per packet */
1875         if (flags & MSG_OOB)
1876                 return 16;
1877
1878         /* This works out the maximum size of segment we can send out */
1879         if (dst) {
1880                 u32 mtu = dst_mtu(dst);
1881                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1882         }
1883
1884         return mss_now;
1885 }
1886
1887 /*
1888  * N.B. We get the timeout wrong here, but then we always did get it
1889  * wrong before and this is another step along the road to correcting
1890  * it. It ought to get updated each time we pass through the routine,
1891  * but in practise it probably doesn't matter too much for now.
1892  */
1893 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1894                               unsigned long datalen, int noblock,
1895                               int *errcode)
1896 {
1897         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1898                                                    noblock, errcode);
1899         if (skb) {
1900                 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1901                 skb->pkt_type = PACKET_OUTGOING;
1902         }
1903         return skb;
1904 }
1905
1906 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1907                       struct msghdr *msg, size_t size)
1908 {
1909         struct sock *sk = sock->sk;
1910         struct dn_scp *scp = DN_SK(sk);
1911         size_t mss;
1912         struct sk_buff_head *queue = &scp->data_xmit_queue;
1913         int flags = msg->msg_flags;
1914         int err = 0;
1915         size_t sent = 0;
1916         int addr_len = msg->msg_namelen;
1917         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1918         struct sk_buff *skb = NULL;
1919         struct dn_skb_cb *cb;
1920         size_t len;
1921         unsigned char fctype;
1922         long timeo;
1923
1924         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1925                 return -EOPNOTSUPP;
1926
1927         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1928                 return -EINVAL;
1929
1930         lock_sock(sk);
1931         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1932         /*
1933          * The only difference between stream sockets and sequenced packet
1934          * sockets is that the stream sockets always behave as if MSG_EOR
1935          * has been set.
1936          */
1937         if (sock->type == SOCK_STREAM) {
1938                 if (flags & MSG_EOR) {
1939                         err = -EINVAL;
1940                         goto out;
1941                 }
1942                 flags |= MSG_EOR;
1943         }
1944
1945
1946         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1947         if (err)
1948                 goto out_err;
1949
1950         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1951                 err = -EPIPE;
1952                 if (!(flags & MSG_NOSIGNAL))
1953                         send_sig(SIGPIPE, current, 0);
1954                 goto out_err;
1955         }
1956
1957         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1958                 dst_negative_advice(&sk->sk_dst_cache);
1959
1960         mss = scp->segsize_rem;
1961         fctype = scp->services_rem & NSP_FC_MASK;
1962
1963         mss = dn_current_mss(sk, flags);
1964
1965         if (flags & MSG_OOB) {
1966                 queue = &scp->other_xmit_queue;
1967                 if (size > mss) {
1968                         err = -EMSGSIZE;
1969                         goto out;
1970                 }
1971         }
1972
1973         scp->persist_fxn = dn_nsp_xmit_timeout;
1974
1975         while(sent < size) {
1976                 err = sock_error(sk);
1977                 if (err)
1978                         goto out;
1979
1980                 if (signal_pending(current)) {
1981                         err = sock_intr_errno(timeo);
1982                         goto out;
1983                 }
1984
1985                 /*
1986                  * Calculate size that we wish to send.
1987                  */
1988                 len = size - sent;
1989
1990                 if (len > mss)
1991                         len = mss;
1992
1993                 /*
1994                  * Wait for queue size to go down below the window
1995                  * size.
1996                  */
1997                 if (dn_queue_too_long(scp, queue, flags)) {
1998                         if (flags & MSG_DONTWAIT) {
1999                                 err = -EWOULDBLOCK;
2000                                 goto out;
2001                         }
2002
2003                         SOCK_SLEEP_PRE(sk)
2004
2005                         if (dn_queue_too_long(scp, queue, flags))
2006                                 schedule();
2007
2008                         SOCK_SLEEP_POST(sk)
2009
2010                         continue;
2011                 }
2012
2013                 /*
2014                  * Get a suitably sized skb.
2015                  * 64 is a bit of a hack really, but its larger than any
2016                  * link-layer headers and has served us well as a good
2017                  * guess as to their real length.
2018                  */
2019                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2020                                          flags & MSG_DONTWAIT, &err);
2021
2022                 if (err)
2023                         break;
2024
2025                 if (!skb)
2026                         continue;
2027
2028                 cb = DN_SKB_CB(skb);
2029
2030                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2031
2032                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2033                         err = -EFAULT;
2034                         goto out;
2035                 }
2036
2037                 if (flags & MSG_OOB) {
2038                         cb->nsp_flags = 0x30;
2039                         if (fctype != NSP_FC_NONE)
2040                                 scp->flowrem_oth--;
2041                 } else {
2042                         cb->nsp_flags = 0x00;
2043                         if (scp->seg_total == 0)
2044                                 cb->nsp_flags |= 0x20;
2045
2046                         scp->seg_total += len;
2047
2048                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2049                                 cb->nsp_flags |= 0x40;
2050                                 scp->seg_total = 0;
2051                                 if (fctype == NSP_FC_SCMC)
2052                                         scp->flowrem_dat--;
2053                         }
2054                         if (fctype == NSP_FC_SRC)
2055                                 scp->flowrem_dat--;
2056                 }
2057
2058                 sent += len;
2059                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2060                 skb = NULL;
2061
2062                 scp->persist = dn_nsp_persist(sk);
2063
2064         }
2065 out:
2066
2067         if (skb)
2068                 kfree_skb(skb);
2069
2070         release_sock(sk);
2071
2072         return sent ? sent : err;
2073
2074 out_err:
2075         err = sk_stream_error(sk, flags, err);
2076         release_sock(sk);
2077         return err;
2078 }
2079
2080 static int dn_device_event(struct notifier_block *this, unsigned long event,
2081                         void *ptr)
2082 {
2083         struct net_device *dev = (struct net_device *)ptr;
2084
2085         switch(event) {
2086                 case NETDEV_UP:
2087                         dn_dev_up(dev);
2088                         break;
2089                 case NETDEV_DOWN:
2090                         dn_dev_down(dev);
2091                         break;
2092                 default:
2093                         break;
2094         }
2095
2096         return NOTIFY_DONE;
2097 }
2098
2099 static struct notifier_block dn_dev_notifier = {
2100         .notifier_call = dn_device_event,
2101 };
2102
2103 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2104
2105 static struct packet_type dn_dix_packet_type = {
2106         .type =         __constant_htons(ETH_P_DNA_RT),
2107         .dev =          NULL,           /* All devices */
2108         .func =         dn_route_rcv,
2109 };
2110
2111 #ifdef CONFIG_PROC_FS
2112 struct dn_iter_state {
2113         int bucket;
2114 };
2115
2116 static struct sock *dn_socket_get_first(struct seq_file *seq)
2117 {
2118         struct dn_iter_state *state = seq->private;
2119         struct sock *n = NULL;
2120
2121         for(state->bucket = 0;
2122             state->bucket < DN_SK_HASH_SIZE;
2123             ++state->bucket) {
2124                 n = sk_head(&dn_sk_hash[state->bucket]);
2125                 if (n)
2126                         break;
2127         }
2128
2129         return n;
2130 }
2131
2132 static struct sock *dn_socket_get_next(struct seq_file *seq,
2133                                        struct sock *n)
2134 {
2135         struct dn_iter_state *state = seq->private;
2136
2137         n = sk_next(n);
2138 try_again:
2139         if (n)
2140                 goto out;
2141         if (++state->bucket >= DN_SK_HASH_SIZE)
2142                 goto out;
2143         n = sk_head(&dn_sk_hash[state->bucket]);
2144         goto try_again;
2145 out:
2146         return n;
2147 }
2148
2149 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2150 {
2151         struct sock *sk = dn_socket_get_first(seq);
2152
2153         if (sk) {
2154                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2155                         --*pos;
2156         }
2157         return *pos ? NULL : sk;
2158 }
2159
2160 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2161 {
2162         void *rc;
2163         read_lock_bh(&dn_hash_lock);
2164         rc = socket_get_idx(seq, &pos);
2165         if (!rc) {
2166                 read_unlock_bh(&dn_hash_lock);
2167         }
2168         return rc;
2169 }
2170
2171 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2172 {
2173         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2174 }
2175
2176 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2177 {
2178         void *rc;
2179
2180         if (v == SEQ_START_TOKEN) {
2181                 rc = dn_socket_get_idx(seq, 0);
2182                 goto out;
2183         }
2184
2185         rc = dn_socket_get_next(seq, v);
2186         if (rc)
2187                 goto out;
2188         read_unlock_bh(&dn_hash_lock);
2189 out:
2190         ++*pos;
2191         return rc;
2192 }
2193
2194 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2195 {
2196         if (v && v != SEQ_START_TOKEN)
2197                 read_unlock_bh(&dn_hash_lock);
2198 }
2199
2200 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2201
2202 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2203 {
2204         int i;
2205
2206         switch (dn_ntohs(dn->sdn_objnamel)) {
2207                 case 0:
2208                         sprintf(buf, "%d", dn->sdn_objnum);
2209                         break;
2210                 default:
2211                         for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2212                                 buf[i] = dn->sdn_objname[i];
2213                                 if (IS_NOT_PRINTABLE(buf[i]))
2214                                         buf[i] = '.';
2215                         }
2216                         buf[i] = 0;
2217         }
2218 }
2219
2220 static char *dn_state2asc(unsigned char state)
2221 {
2222         switch(state) {
2223                 case DN_O:
2224                         return "OPEN";
2225                 case DN_CR:
2226                         return "  CR";
2227                 case DN_DR:
2228                         return "  DR";
2229                 case DN_DRC:
2230                         return " DRC";
2231                 case DN_CC:
2232                         return "  CC";
2233                 case DN_CI:
2234                         return "  CI";
2235                 case DN_NR:
2236                         return "  NR";
2237                 case DN_NC:
2238                         return "  NC";
2239                 case DN_CD:
2240                         return "  CD";
2241                 case DN_RJ:
2242                         return "  RJ";
2243                 case DN_RUN:
2244                         return " RUN";
2245                 case DN_DI:
2246                         return "  DI";
2247                 case DN_DIC:
2248                         return " DIC";
2249                 case DN_DN:
2250                         return "  DN";
2251                 case DN_CL:
2252                         return "  CL";
2253                 case DN_CN:
2254                         return "  CN";
2255         }
2256
2257         return "????";
2258 }
2259
2260 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2261 {
2262         struct dn_scp *scp = DN_SK(sk);
2263         char buf1[DN_ASCBUF_LEN];
2264         char buf2[DN_ASCBUF_LEN];
2265         char local_object[DN_MAXOBJL+3];
2266         char remote_object[DN_MAXOBJL+3];
2267
2268         dn_printable_object(&scp->addr, local_object);
2269         dn_printable_object(&scp->peer, remote_object);
2270
2271         seq_printf(seq,
2272                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2273                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2274                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2275                    scp->addrloc,
2276                    scp->numdat,
2277                    scp->numoth,
2278                    scp->ackxmt_dat,
2279                    scp->ackxmt_oth,
2280                    scp->flowloc_sw,
2281                    local_object,
2282                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2283                    scp->addrrem,
2284                    scp->numdat_rcv,
2285                    scp->numoth_rcv,
2286                    scp->ackrcv_dat,
2287                    scp->ackrcv_oth,
2288                    scp->flowrem_sw,
2289                    remote_object,
2290                    dn_state2asc(scp->state),
2291                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2292 }
2293
2294 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2295 {
2296         if (v == SEQ_START_TOKEN) {
2297                 seq_puts(seq, "Local                                              Remote\n");
2298         } else {
2299                 dn_socket_format_entry(seq, v);
2300         }
2301         return 0;
2302 }
2303
2304 static struct seq_operations dn_socket_seq_ops = {
2305         .start  = dn_socket_seq_start,
2306         .next   = dn_socket_seq_next,
2307         .stop   = dn_socket_seq_stop,
2308         .show   = dn_socket_seq_show,
2309 };
2310
2311 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2312 {
2313         struct seq_file *seq;
2314         int rc = -ENOMEM;
2315         struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2316
2317         if (!s)
2318                 goto out;
2319
2320         rc = seq_open(file, &dn_socket_seq_ops);
2321         if (rc)
2322                 goto out_kfree;
2323
2324         seq             = file->private_data;
2325         seq->private    = s;
2326         memset(s, 0, sizeof(*s));
2327 out:
2328         return rc;
2329 out_kfree:
2330         kfree(s);
2331         goto out;
2332 }
2333
2334 static struct file_operations dn_socket_seq_fops = {
2335         .owner          = THIS_MODULE,
2336         .open           = dn_socket_seq_open,
2337         .read           = seq_read,
2338         .llseek         = seq_lseek,
2339         .release        = seq_release_private,
2340 };
2341 #endif
2342
2343 static struct net_proto_family  dn_family_ops = {
2344         .family =       AF_DECnet,
2345         .create =       dn_create,
2346         .owner  =       THIS_MODULE,
2347 };
2348
2349 static const struct proto_ops dn_proto_ops = {
2350         .family =       AF_DECnet,
2351         .owner =        THIS_MODULE,
2352         .release =      dn_release,
2353         .bind =         dn_bind,
2354         .connect =      dn_connect,
2355         .socketpair =   sock_no_socketpair,
2356         .accept =       dn_accept,
2357         .getname =      dn_getname,
2358         .poll =         dn_poll,
2359         .ioctl =        dn_ioctl,
2360         .listen =       dn_listen,
2361         .shutdown =     dn_shutdown,
2362         .setsockopt =   dn_setsockopt,
2363         .getsockopt =   dn_getsockopt,
2364         .sendmsg =      dn_sendmsg,
2365         .recvmsg =      dn_recvmsg,
2366         .mmap =         sock_no_mmap,
2367         .sendpage =     sock_no_sendpage,
2368 };
2369
2370 void dn_register_sysctl(void);
2371 void dn_unregister_sysctl(void);
2372
2373 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2374 MODULE_AUTHOR("Linux DECnet Project Team");
2375 MODULE_LICENSE("GPL");
2376 MODULE_ALIAS_NETPROTO(PF_DECnet);
2377
2378 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2379
2380 static int __init decnet_init(void)
2381 {
2382         int rc;
2383
2384         printk(banner);
2385
2386         rc = proto_register(&dn_proto, 1);
2387         if (rc != 0)
2388                 goto out;
2389
2390         dn_neigh_init();
2391         dn_dev_init();
2392         dn_route_init();
2393         dn_fib_init();
2394
2395         sock_register(&dn_family_ops);
2396         dev_add_pack(&dn_dix_packet_type);
2397         register_netdevice_notifier(&dn_dev_notifier);
2398
2399         proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
2400         dn_register_sysctl();
2401 out:
2402         return rc;
2403
2404 }
2405 module_init(decnet_init);
2406
2407 /*
2408  * Prevent DECnet module unloading until its fixed properly.
2409  * Requires an audit of the code to check for memory leaks and
2410  * initialisation problems etc.
2411  */
2412 #if 0
2413 static void __exit decnet_exit(void)
2414 {
2415         sock_unregister(AF_DECnet);
2416         dev_remove_pack(&dn_dix_packet_type);
2417
2418         dn_unregister_sysctl();
2419
2420         unregister_netdevice_notifier(&dn_dev_notifier);
2421
2422         dn_route_cleanup();
2423         dn_dev_cleanup();
2424         dn_neigh_cleanup();
2425         dn_fib_cleanup();
2426
2427         proc_net_remove("decnet");
2428
2429         proto_unregister(&dn_proto);
2430 }
2431 module_exit(decnet_exit);
2432 #endif