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, *ldev;
 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                         ldev = NULL;
 750                         for_each_netdev(dev) {
 751                                 if (!dev->dn_ptr)
 752                                         continue;
 753                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 754                                         ldev = dev;
 755                                         break;
 756                                 }
 757                         }
 758                         read_unlock(&dev_base_lock);
 759                         if (ldev == NULL)
 760                                 return -EADDRNOTAVAIL;
 761                 }
 762         }
 763
 764         rv = -EINVAL;
 765         lock_sock(sk);
 766         if (sock_flag(sk, SOCK_ZAPPED)) {
 767                 memcpy(&scp->addr, saddr, addr_len);
 768                 sock_reset_flag(sk, SOCK_ZAPPED);
 769
 770                 rv = dn_hash_sock(sk);
 771                 if (rv)
 772                         sock_set_flag(sk, SOCK_ZAPPED);
 773         }
 774         release_sock(sk);
 775
 776         return rv;
 777 }
 778
 779
 780 static int dn_auto_bind(struct socket *sock)
 781 {
 782         struct sock *sk = sock->sk;
 783         struct dn_scp *scp = DN_SK(sk);
 784         int rv;
 785
 786         sock_reset_flag(sk, SOCK_ZAPPED);
 787
 788         scp->addr.sdn_flags  = 0;
 789         scp->addr.sdn_objnum = 0;
 790
 791         /*
 792          * This stuff is to keep compatibility with Eduardo's
 793          * patch. I hope I can dispense with it shortly...
 794          */
 795         if ((scp->accessdata.acc_accl != 0) &&
 796                 (scp->accessdata.acc_accl <= 12)) {
 797
 798                 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
 799                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
 800
 801                 scp->accessdata.acc_accl = 0;
 802                 memset(scp->accessdata.acc_acc, 0, 40);
 803         }
 804         /* End of compatibility stuff */
 805
 806         scp->addr.sdn_add.a_len = dn_htons(2);
 807         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 808         if (rv == 0) {
 809                 rv = dn_hash_sock(sk);
 810                 if (rv)
 811                         sock_set_flag(sk, SOCK_ZAPPED);
 812         }
 813
 814         return rv;
 815 }
 816
 817 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 818 {
 819         struct dn_scp *scp = DN_SK(sk);
 820         DEFINE_WAIT(wait);
 821         int err;
 822
 823         if (scp->state != DN_CR)
 824                 return -EINVAL;
 825
 826         scp->state = DN_CC;
 827         scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
 828         dn_send_conn_conf(sk, allocation);
 829
 830         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 831         for(;;) {
 832                 release_sock(sk);
 833                 if (scp->state == DN_CC)
 834                         *timeo = schedule_timeout(*timeo);
 835                 lock_sock(sk);
 836                 err = 0;
 837                 if (scp->state == DN_RUN)
 838                         break;
 839                 err = sock_error(sk);
 840                 if (err)
 841                         break;
 842                 err = sock_intr_errno(*timeo);
 843                 if (signal_pending(current))
 844                         break;
 845                 err = -EAGAIN;
 846                 if (!*timeo)
 847                         break;
 848                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 849         }
 850         finish_wait(sk->sk_sleep, &wait);
 851         if (err == 0) {
 852                 sk->sk_socket->state = SS_CONNECTED;
 853         } else if (scp->state != DN_CC) {
 854                 sk->sk_socket->state = SS_UNCONNECTED;
 855         }
 856         return err;
 857 }
 858
 859 static int dn_wait_run(struct sock *sk, long *timeo)
 860 {
 861         struct dn_scp *scp = DN_SK(sk);
 862         DEFINE_WAIT(wait);
 863         int err = 0;
 864
 865         if (scp->state == DN_RUN)
 866                 goto out;
 867
 868         if (!*timeo)
 869                 return -EALREADY;
 870
 871         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 872         for(;;) {
 873                 release_sock(sk);
 874                 if (scp->state == DN_CI || scp->state == DN_CC)
 875                         *timeo = schedule_timeout(*timeo);
 876                 lock_sock(sk);
 877                 err = 0;
 878                 if (scp->state == DN_RUN)
 879                         break;
 880                 err = sock_error(sk);
 881                 if (err)
 882                         break;
 883                 err = sock_intr_errno(*timeo);
 884                 if (signal_pending(current))
 885                         break;
 886                 err = -ETIMEDOUT;
 887                 if (!*timeo)
 888                         break;
 889                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 890         }
 891         finish_wait(sk->sk_sleep, &wait);
 892 out:
 893         if (err == 0) {
 894                 sk->sk_socket->state = SS_CONNECTED;
 895         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 896                 sk->sk_socket->state = SS_UNCONNECTED;
 897         }
 898         return err;
 899 }
 900
 901 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 902 {
 903         struct socket *sock = sk->sk_socket;
 904         struct dn_scp *scp = DN_SK(sk);
 905         int err = -EISCONN;
 906         struct flowi fl;
 907
 908         if (sock->state == SS_CONNECTED)
 909                 goto out;
 910
 911         if (sock->state == SS_CONNECTING) {
 912                 err = 0;
 913                 if (scp->state == DN_RUN) {
 914                         sock->state = SS_CONNECTED;
 915                         goto out;
 916                 }
 917                 err = -ECONNREFUSED;
 918                 if (scp->state != DN_CI && scp->state != DN_CC) {
 919                         sock->state = SS_UNCONNECTED;
 920                         goto out;
 921                 }
 922                 return dn_wait_run(sk, timeo);
 923         }
 924
 925         err = -EINVAL;
 926         if (scp->state != DN_O)
 927                 goto out;
 928
 929         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 930                 goto out;
 931         if (addr->sdn_family != AF_DECnet)
 932                 goto out;
 933         if (addr->sdn_flags & SDF_WILD)
 934                 goto out;
 935
 936         if (sock_flag(sk, SOCK_ZAPPED)) {
 937                 err = dn_auto_bind(sk->sk_socket);
 938                 if (err)
 939                         goto out;
 940         }
 941
 942         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 943
 944         err = -EHOSTUNREACH;
 945         memset(&fl, 0, sizeof(fl));
 946         fl.oif = sk->sk_bound_dev_if;
 947         fl.fld_dst = dn_saddr2dn(&scp->peer);
 948         fl.fld_src = dn_saddr2dn(&scp->addr);
 949         dn_sk_ports_copy(&fl, scp);
 950         fl.proto = DNPROTO_NSP;
 951         if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
 952                 goto out;
 953         sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 954         sock->state = SS_CONNECTING;
 955         scp->state = DN_CI;
 956         scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
 957
 958         dn_nsp_send_conninit(sk, NSP_CI);
 959         err = -EINPROGRESS;
 960         if (*timeo) {
 961                 err = dn_wait_run(sk, timeo);
 962         }
 963 out:
 964         return err;
 965 }
 966
 967 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 968 {
 969         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 970         struct sock *sk = sock->sk;
 971         int err;
 972         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 973
 974         lock_sock(sk);
 975         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 976         release_sock(sk);
 977
 978         return err;
 979 }
 980
 981 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 982 {
 983         struct dn_scp *scp = DN_SK(sk);
 984
 985         switch(scp->state) {
 986                 case DN_RUN:
 987                         return 0;
 988                 case DN_CR:
 989                         return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 990                 case DN_CI:
 991                 case DN_CC:
 992                         return dn_wait_run(sk, timeo);
 993                 case DN_O:
 994                         return __dn_connect(sk, addr, addrlen, timeo, flags);
 995         }
 996
 997         return -EINVAL;
 998 }
 999
1000
1001 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1002 {
1003         unsigned char *ptr = skb->data;
1004
1005         acc->acc_userl = *ptr++;
1006         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1007         ptr += acc->acc_userl;
1008
1009         acc->acc_passl = *ptr++;
1010         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1011         ptr += acc->acc_passl;
1012
1013         acc->acc_accl = *ptr++;
1014         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1015
1016         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1017
1018 }
1019
1020 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1021 {
1022         unsigned char *ptr = skb->data;
1023         u16 len = *ptr++; /* yes, it's 8bit on the wire */
1024
1025         BUG_ON(len > 16); /* we've checked the contents earlier */
1026         opt->opt_optl   = dn_htons(len);
1027         opt->opt_status = 0;
1028         memcpy(opt->opt_data, ptr, len);
1029         skb_pull(skb, len + 1);
1030 }
1031
1032 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1033 {
1034         DEFINE_WAIT(wait);
1035         struct sk_buff *skb = NULL;
1036         int err = 0;
1037
1038         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1039         for(;;) {
1040                 release_sock(sk);
1041                 skb = skb_dequeue(&sk->sk_receive_queue);
1042                 if (skb == NULL) {
1043                         *timeo = schedule_timeout(*timeo);
1044                         skb = skb_dequeue(&sk->sk_receive_queue);
1045                 }
1046                 lock_sock(sk);
1047                 if (skb != NULL)
1048                         break;
1049                 err = -EINVAL;
1050                 if (sk->sk_state != TCP_LISTEN)
1051                         break;
1052                 err = sock_intr_errno(*timeo);
1053                 if (signal_pending(current))
1054                         break;
1055                 err = -EAGAIN;
1056                 if (!*timeo)
1057                         break;
1058                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1059         }
1060         finish_wait(sk->sk_sleep, &wait);
1061
1062         return skb == NULL ? ERR_PTR(err) : skb;
1063 }
1064
1065 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1066 {
1067         struct sock *sk = sock->sk, *newsk;
1068         struct sk_buff *skb = NULL;
1069         struct dn_skb_cb *cb;
1070         unsigned char menuver;
1071         int err = 0;
1072         unsigned char type;
1073         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1074
1075         lock_sock(sk);
1076
1077         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1078                 release_sock(sk);
1079                 return -EINVAL;
1080         }
1081
1082         skb = skb_dequeue(&sk->sk_receive_queue);
1083         if (skb == NULL) {
1084                 skb = dn_wait_for_connect(sk, &timeo);
1085                 if (IS_ERR(skb)) {
1086                         release_sock(sk);
1087                         return PTR_ERR(skb);
1088                 }
1089         }
1090
1091         cb = DN_SKB_CB(skb);
1092         sk->sk_ack_backlog--;
1093         newsk = dn_alloc_sock(newsock, sk->sk_allocation);
1094         if (newsk == NULL) {
1095                 release_sock(sk);
1096                 kfree_skb(skb);
1097                 return -ENOBUFS;
1098         }
1099         release_sock(sk);
1100
1101         dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1102         skb->dst = NULL;
1103
1104         DN_SK(newsk)->state        = DN_CR;
1105         DN_SK(newsk)->addrrem      = cb->src_port;
1106         DN_SK(newsk)->services_rem = cb->services;
1107         DN_SK(newsk)->info_rem     = cb->info;
1108         DN_SK(newsk)->segsize_rem  = cb->segsize;
1109         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1110
1111         if (DN_SK(newsk)->segsize_rem < 230)
1112                 DN_SK(newsk)->segsize_rem = 230;
1113
1114         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1115                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1116
1117         newsk->sk_state  = TCP_LISTEN;
1118         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1119
1120         /*
1121          * If we are listening on a wild socket, we don't want
1122          * the newly created socket on the wrong hash queue.
1123          */
1124         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1125
1126         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1127         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1128         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1129         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1130
1131         menuver = *skb->data;
1132         skb_pull(skb, 1);
1133
1134         if (menuver & DN_MENUVER_ACC)
1135                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1136
1137         if (menuver & DN_MENUVER_USR)
1138                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1139
1140         if (menuver & DN_MENUVER_PRX)
1141                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1142
1143         if (menuver & DN_MENUVER_UIC)
1144                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1145
1146         kfree_skb(skb);
1147
1148         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1149                 sizeof(struct optdata_dn));
1150         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1151                 sizeof(struct optdata_dn));
1152
1153         lock_sock(newsk);
1154         err = dn_hash_sock(newsk);
1155         if (err == 0) {
1156                 sock_reset_flag(newsk, SOCK_ZAPPED);
1157                 dn_send_conn_ack(newsk);
1158
1159                 /*
1160                  * Here we use sk->sk_allocation since although the conn conf is
1161                  * for the newsk, the context is the old socket.
1162                  */
1163                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1164                         err = dn_confirm_accept(newsk, &timeo,
1165                                                 sk->sk_allocation);
1166         }
1167         release_sock(newsk);
1168         return err;
1169 }
1170
1171
1172 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1173 {
1174         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1175         struct sock *sk = sock->sk;
1176         struct dn_scp *scp = DN_SK(sk);
1177
1178         *uaddr_len = sizeof(struct sockaddr_dn);
1179
1180         lock_sock(sk);
1181
1182         if (peer) {
1183                 if ((sock->state != SS_CONNECTED &&
1184                      sock->state != SS_CONNECTING) &&
1185                     scp->accept_mode == ACC_IMMED) {
1186                         release_sock(sk);
1187                         return -ENOTCONN;
1188                 }
1189
1190                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1191         } else {
1192                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1193         }
1194
1195         release_sock(sk);
1196
1197         return 0;
1198 }
1199
1200
1201 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1202 {
1203         struct sock *sk = sock->sk;
1204         struct dn_scp *scp = DN_SK(sk);
1205         int mask = datagram_poll(file, sock, wait);
1206
1207         if (!skb_queue_empty(&scp->other_receive_queue))
1208                 mask |= POLLRDBAND;
1209
1210         return mask;
1211 }
1212
1213 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1214 {
1215         struct sock *sk = sock->sk;
1216         struct dn_scp *scp = DN_SK(sk);
1217         int err = -EOPNOTSUPP;
1218         long amount = 0;
1219         struct sk_buff *skb;
1220         int val;
1221
1222         switch(cmd)
1223         {
1224         case SIOCGIFADDR:
1225         case SIOCSIFADDR:
1226                 return dn_dev_ioctl(cmd, (void __user *)arg);
1227
1228         case SIOCATMARK:
1229                 lock_sock(sk);
1230                 val = !skb_queue_empty(&scp->other_receive_queue);
1231                 if (scp->state != DN_RUN)
1232                         val = -ENOTCONN;
1233                 release_sock(sk);
1234                 return val;
1235
1236         case TIOCOUTQ:
1237                 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1238                 if (amount < 0)
1239                         amount = 0;
1240                 err = put_user(amount, (int __user *)arg);
1241                 break;
1242
1243         case TIOCINQ:
1244                 lock_sock(sk);
1245                 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1246                         amount = skb->len;
1247                 } else {
1248                         struct sk_buff *skb = sk->sk_receive_queue.next;
1249                         for(;;) {
1250                                 if (skb ==
1251                                     (struct sk_buff *)&sk->sk_receive_queue)
1252                                         break;
1253                                 amount += skb->len;
1254                                 skb = skb->next;
1255                         }
1256                 }
1257                 release_sock(sk);
1258                 err = put_user(amount, (int __user *)arg);
1259                 break;
1260
1261         default:
1262                 err = -ENOIOCTLCMD;
1263                 break;
1264         }
1265
1266         return err;
1267 }
1268
1269 static int dn_listen(struct socket *sock, int backlog)
1270 {
1271         struct sock *sk = sock->sk;
1272         int err = -EINVAL;
1273
1274         lock_sock(sk);
1275
1276         if (sock_flag(sk, SOCK_ZAPPED))
1277                 goto out;
1278
1279         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1280                 goto out;
1281
1282         sk->sk_max_ack_backlog = backlog;
1283         sk->sk_ack_backlog     = 0;
1284         sk->sk_state           = TCP_LISTEN;
1285         err                 = 0;
1286         dn_rehash_sock(sk);
1287
1288 out:
1289         release_sock(sk);
1290
1291         return err;
1292 }
1293
1294
1295 static int dn_shutdown(struct socket *sock, int how)
1296 {
1297         struct sock *sk = sock->sk;
1298         struct dn_scp *scp = DN_SK(sk);
1299         int err = -ENOTCONN;
1300
1301         lock_sock(sk);
1302
1303         if (sock->state == SS_UNCONNECTED)
1304                 goto out;
1305
1306         err = 0;
1307         if (sock->state == SS_DISCONNECTING)
1308                 goto out;
1309
1310         err = -EINVAL;
1311         if (scp->state == DN_O)
1312                 goto out;
1313
1314         if (how != SHUTDOWN_MASK)
1315                 goto out;
1316
1317         sk->sk_shutdown = how;
1318         dn_destroy_sock(sk);
1319         err = 0;
1320
1321 out:
1322         release_sock(sk);
1323
1324         return err;
1325 }
1326
1327 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1328 {
1329         struct sock *sk = sock->sk;
1330         int err;
1331
1332         lock_sock(sk);
1333         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1334         release_sock(sk);
1335
1336         return err;
1337 }
1338
1339 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1340 {
1341         struct  sock *sk = sock->sk;
1342         struct dn_scp *scp = DN_SK(sk);
1343         long timeo;
1344         union {
1345                 struct optdata_dn opt;
1346                 struct accessdata_dn acc;
1347                 int mode;
1348                 unsigned long win;
1349                 int val;
1350                 unsigned char services;
1351                 unsigned char info;
1352         } u;
1353         int err;
1354
1355         if (optlen && !optval)
1356                 return -EINVAL;
1357
1358         if (optlen > sizeof(u))
1359                 return -EINVAL;
1360
1361         if (copy_from_user(&u, optval, optlen))
1362                 return -EFAULT;
1363
1364         switch(optname) {
1365                 case DSO_CONDATA:
1366                         if (sock->state == SS_CONNECTED)
1367                                 return -EISCONN;
1368                         if ((scp->state != DN_O) && (scp->state != DN_CR))
1369                                 return -EINVAL;
1370
1371                         if (optlen != sizeof(struct optdata_dn))
1372                                 return -EINVAL;
1373
1374                         if (dn_ntohs(u.opt.opt_optl) > 16)
1375                                 return -EINVAL;
1376
1377                         memcpy(&scp->conndata_out, &u.opt, optlen);
1378                         break;
1379
1380                 case DSO_DISDATA:
1381                         if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1382                                 return -ENOTCONN;
1383
1384                         if (optlen != sizeof(struct optdata_dn))
1385                                 return -EINVAL;
1386
1387                         if (dn_ntohs(u.opt.opt_optl) > 16)
1388                                 return -EINVAL;
1389
1390                         memcpy(&scp->discdata_out, &u.opt, optlen);
1391                         break;
1392
1393                 case DSO_CONACCESS:
1394                         if (sock->state == SS_CONNECTED)
1395                                 return -EISCONN;
1396                         if (scp->state != DN_O)
1397                                 return -EINVAL;
1398
1399                         if (optlen != sizeof(struct accessdata_dn))
1400                                 return -EINVAL;
1401
1402                         if ((u.acc.acc_accl > DN_MAXACCL) ||
1403                                         (u.acc.acc_passl > DN_MAXACCL) ||
1404                                         (u.acc.acc_userl > DN_MAXACCL))
1405                                 return -EINVAL;
1406
1407                         memcpy(&scp->accessdata, &u.acc, optlen);
1408                         break;
1409
1410                 case DSO_ACCEPTMODE:
1411                         if (sock->state == SS_CONNECTED)
1412                                 return -EISCONN;
1413                         if (scp->state != DN_O)
1414                                 return -EINVAL;
1415
1416                         if (optlen != sizeof(int))
1417                                 return -EINVAL;
1418
1419                         if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1420                                 return -EINVAL;
1421
1422                         scp->accept_mode = (unsigned char)u.mode;
1423                         break;
1424
1425                 case DSO_CONACCEPT:
1426
1427                         if (scp->state != DN_CR)
1428                                 return -EINVAL;
1429                         timeo = sock_rcvtimeo(sk, 0);
1430                         err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1431                         return err;
1432
1433                 case DSO_CONREJECT:
1434
1435                         if (scp->state != DN_CR)
1436                                 return -EINVAL;
1437
1438                         scp->state = DN_DR;
1439                         sk->sk_shutdown = SHUTDOWN_MASK;
1440                         dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1441                         break;
1442
1443                 default:
1444 #ifdef CONFIG_NETFILTER
1445                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1446 #endif
1447                 case DSO_LINKINFO:
1448                 case DSO_STREAM:
1449                 case DSO_SEQPACKET:
1450                         return -ENOPROTOOPT;
1451
1452                 case DSO_MAXWINDOW:
1453                         if (optlen != sizeof(unsigned long))
1454                                 return -EINVAL;
1455                         if (u.win > NSP_MAX_WINDOW)
1456                                 u.win = NSP_MAX_WINDOW;
1457                         if (u.win == 0)
1458                                 return -EINVAL;
1459                         scp->max_window = u.win;
1460                         if (scp->snd_window > u.win)
1461                                 scp->snd_window = u.win;
1462                         break;
1463
1464                 case DSO_NODELAY:
1465                         if (optlen != sizeof(int))
1466                                 return -EINVAL;
1467                         if (scp->nonagle == 2)
1468                                 return -EINVAL;
1469                         scp->nonagle = (u.val == 0) ? 0 : 1;
1470                         /* if (scp->nonagle == 1) { Push pending frames } */
1471                         break;
1472
1473                 case DSO_CORK:
1474                         if (optlen != sizeof(int))
1475                                 return -EINVAL;
1476                         if (scp->nonagle == 1)
1477                                 return -EINVAL;
1478                         scp->nonagle = (u.val == 0) ? 0 : 2;
1479                         /* if (scp->nonagle == 0) { Push pending frames } */
1480                         break;
1481
1482                 case DSO_SERVICES:
1483                         if (optlen != sizeof(unsigned char))
1484                                 return -EINVAL;
1485                         if ((u.services & ~NSP_FC_MASK) != 0x01)
1486                                 return -EINVAL;
1487                         if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1488                                 return -EINVAL;
1489                         scp->services_loc = u.services;
1490                         break;
1491
1492                 case DSO_INFO:
1493                         if (optlen != sizeof(unsigned char))
1494                                 return -EINVAL;
1495                         if (u.info & 0xfc)
1496                                 return -EINVAL;
1497                         scp->info_loc = u.info;
1498                         break;
1499         }
1500
1501         return 0;
1502 }
1503
1504 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1505 {
1506         struct sock *sk = sock->sk;
1507         int err;
1508
1509         lock_sock(sk);
1510         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1511         release_sock(sk);
1512
1513         return err;
1514 }
1515
1516 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1517 {
1518         struct  sock *sk = sock->sk;
1519         struct dn_scp *scp = DN_SK(sk);
1520         struct linkinfo_dn link;
1521         unsigned int r_len;
1522         void *r_data = NULL;
1523         unsigned int val;
1524
1525         if(get_user(r_len , optlen))
1526                 return -EFAULT;
1527
1528         switch(optname) {
1529                 case DSO_CONDATA:
1530                         if (r_len > sizeof(struct optdata_dn))
1531                                 r_len = sizeof(struct optdata_dn);
1532                         r_data = &scp->conndata_in;
1533                         break;
1534
1535                 case DSO_DISDATA:
1536                         if (r_len > sizeof(struct optdata_dn))
1537                                 r_len = sizeof(struct optdata_dn);
1538                         r_data = &scp->discdata_in;
1539                         break;
1540
1541                 case DSO_CONACCESS:
1542                         if (r_len > sizeof(struct accessdata_dn))
1543                                 r_len = sizeof(struct accessdata_dn);
1544                         r_data = &scp->accessdata;
1545                         break;
1546
1547                 case DSO_ACCEPTMODE:
1548                         if (r_len > sizeof(unsigned char))
1549                                 r_len = sizeof(unsigned char);
1550                         r_data = &scp->accept_mode;
1551                         break;
1552
1553                 case DSO_LINKINFO:
1554                         if (r_len > sizeof(struct linkinfo_dn))
1555                                 r_len = sizeof(struct linkinfo_dn);
1556
1557                         switch(sock->state) {
1558                                 case SS_CONNECTING:
1559                                         link.idn_linkstate = LL_CONNECTING;
1560                                         break;
1561                                 case SS_DISCONNECTING:
1562                                         link.idn_linkstate = LL_DISCONNECTING;
1563                                         break;
1564                                 case SS_CONNECTED:
1565                                         link.idn_linkstate = LL_RUNNING;
1566                                         break;
1567                                 default:
1568                                         link.idn_linkstate = LL_INACTIVE;
1569                         }
1570
1571                         link.idn_segsize = scp->segsize_rem;
1572                         r_data = &link;
1573                         break;
1574
1575                 default:
1576 #ifdef CONFIG_NETFILTER
1577                 {
1578                         int val, len;
1579
1580                         if(get_user(len, optlen))
1581                                 return -EFAULT;
1582
1583                         val = nf_getsockopt(sk, PF_DECnet, optname,
1584                                                         optval, &len);
1585                         if (val >= 0)
1586                                 val = put_user(len, optlen);
1587                         return val;
1588                 }
1589 #endif
1590                 case DSO_STREAM:
1591                 case DSO_SEQPACKET:
1592                 case DSO_CONACCEPT:
1593                 case DSO_CONREJECT:
1594                         return -ENOPROTOOPT;
1595
1596                 case DSO_MAXWINDOW:
1597                         if (r_len > sizeof(unsigned long))
1598                                 r_len = sizeof(unsigned long);
1599                         r_data = &scp->max_window;
1600                         break;
1601
1602                 case DSO_NODELAY:
1603                         if (r_len > sizeof(int))
1604                                 r_len = sizeof(int);
1605                         val = (scp->nonagle == 1);
1606                         r_data = &val;
1607                         break;
1608
1609                 case DSO_CORK:
1610                         if (r_len > sizeof(int))
1611                                 r_len = sizeof(int);
1612                         val = (scp->nonagle == 2);
1613                         r_data = &val;
1614                         break;
1615
1616                 case DSO_SERVICES:
1617                         if (r_len > sizeof(unsigned char))
1618                                 r_len = sizeof(unsigned char);
1619                         r_data = &scp->services_rem;
1620                         break;
1621
1622                 case DSO_INFO:
1623                         if (r_len > sizeof(unsigned char))
1624                                 r_len = sizeof(unsigned char);
1625                         r_data = &scp->info_rem;
1626                         break;
1627         }
1628
1629         if (r_data) {
1630                 if (copy_to_user(optval, r_data, r_len))
1631                         return -EFAULT;
1632                 if (put_user(r_len, optlen))
1633                         return -EFAULT;
1634         }
1635
1636         return 0;
1637 }
1638
1639
1640 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1641 {
1642         struct sk_buff *skb = q->next;
1643         int len = 0;
1644
1645         if (flags & MSG_OOB)
1646                 return !skb_queue_empty(q) ? 1 : 0;
1647
1648         while(skb != (struct sk_buff *)q) {
1649                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1650                 len += skb->len;
1651
1652                 if (cb->nsp_flags & 0x40) {
1653                         /* SOCK_SEQPACKET reads to EOM */
1654                         if (sk->sk_type == SOCK_SEQPACKET)
1655                                 return 1;
1656                         /* so does SOCK_STREAM unless WAITALL is specified */
1657                         if (!(flags & MSG_WAITALL))
1658                                 return 1;
1659                 }
1660
1661                 /* minimum data length for read exceeded */
1662                 if (len >= target)
1663                         return 1;
1664
1665                 skb = skb->next;
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, *nskb;
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                 if (sk->sk_err)
1719                         goto out;
1720
1721                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1722                         if (!(flags & MSG_OOB)) {
1723                                 msg->msg_flags |= MSG_OOB;
1724                                 if (!scp->other_report) {
1725                                         scp->other_report = 1;
1726                                         goto out;
1727                                 }
1728                         }
1729                 }
1730
1731                 if (scp->state != DN_RUN)
1732                         goto out;
1733
1734                 if (signal_pending(current)) {
1735                         rv = sock_intr_errno(timeo);
1736                         goto out;
1737                 }
1738
1739                 if (dn_data_ready(sk, queue, flags, target))
1740                         break;
1741
1742                 if (flags & MSG_DONTWAIT) {
1743                         rv = -EWOULDBLOCK;
1744                         goto out;
1745                 }
1746
1747                 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1748                 SOCK_SLEEP_PRE(sk)
1749
1750                 if (!dn_data_ready(sk, queue, flags, target))
1751                         schedule();
1752
1753                 SOCK_SLEEP_POST(sk)
1754                 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1755         }
1756
1757         for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1758                 unsigned int chunk = skb->len;
1759                 cb = DN_SKB_CB(skb);
1760
1761                 if ((chunk + copied) > size)
1762                         chunk = size - copied;
1763
1764                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1765                         rv = -EFAULT;
1766                         break;
1767                 }
1768                 copied += chunk;
1769
1770                 if (!(flags & MSG_PEEK))
1771                         skb_pull(skb, chunk);
1772
1773                 eor = cb->nsp_flags & 0x40;
1774                 nskb = skb->next;
1775
1776                 if (skb->len == 0) {
1777                         skb_unlink(skb, queue);
1778                         kfree_skb(skb);
1779                         /*
1780                          * N.B. Don't refer to skb or cb after this point
1781                          * in loop.
1782                          */
1783                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1784                                 scp->flowloc_sw = DN_SEND;
1785                                 dn_nsp_send_link(sk, DN_SEND, 0);
1786                         }
1787                 }
1788
1789                 if (eor) {
1790                         if (sk->sk_type == SOCK_SEQPACKET)
1791                                 break;
1792                         if (!(flags & MSG_WAITALL))
1793                                 break;
1794                 }
1795
1796                 if (flags & MSG_OOB)
1797                         break;
1798
1799                 if (copied >= target)
1800                         break;
1801         }
1802
1803         rv = copied;
1804
1805
1806         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1807                 msg->msg_flags |= MSG_EOR;
1808
1809 out:
1810         if (rv == 0)
1811                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1812
1813         if ((rv >= 0) && msg->msg_name) {
1814                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1815                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1816         }
1817
1818         release_sock(sk);
1819
1820         return rv;
1821 }
1822
1823
1824 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1825 {
1826         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1827         if (skb_queue_len(queue) >= scp->snd_window)
1828                 return 1;
1829         if (fctype != NSP_FC_NONE) {
1830                 if (flags & MSG_OOB) {
1831                         if (scp->flowrem_oth == 0)
1832                                 return 1;
1833                 } else {
1834                         if (scp->flowrem_dat == 0)
1835                                 return 1;
1836                 }
1837         }
1838         return 0;
1839 }
1840
1841 /*
1842  * The DECnet spec requires that the "routing layer" accepts packets which
1843  * are at least 230 bytes in size. This excludes any headers which the NSP
1844  * layer might add, so we always assume that we'll be using the maximal
1845  * length header on data packets. The variation in length is due to the
1846  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1847  * make much practical difference.
1848  */
1849 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1850 {
1851         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1852         if (dev) {
1853                 struct dn_dev *dn_db = dev->dn_ptr;
1854                 mtu -= LL_RESERVED_SPACE(dev);
1855                 if (dn_db->use_long)
1856                         mtu -= 21;
1857                 else
1858                         mtu -= 6;
1859                 mtu -= DN_MAX_NSP_DATA_HEADER;
1860         } else {
1861                 /*
1862                  * 21 = long header, 16 = guess at MAC header length
1863                  */
1864                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1865         }
1866         if (mtu > mss)
1867                 mss = mtu;
1868         return mss;
1869 }
1870
1871 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1872 {
1873         struct dst_entry *dst = __sk_dst_get(sk);
1874         struct dn_scp *scp = DN_SK(sk);
1875         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1876
1877         /* Other data messages are limited to 16 bytes per packet */
1878         if (flags & MSG_OOB)
1879                 return 16;
1880
1881         /* This works out the maximum size of segment we can send out */
1882         if (dst) {
1883                 u32 mtu = dst_mtu(dst);
1884                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1885         }
1886
1887         return mss_now;
1888 }
1889
1890 /*
1891  * N.B. We get the timeout wrong here, but then we always did get it
1892  * wrong before and this is another step along the road to correcting
1893  * it. It ought to get updated each time we pass through the routine,
1894  * but in practise it probably doesn't matter too much for now.
1895  */
1896 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1897                               unsigned long datalen, int noblock,
1898                               int *errcode)
1899 {
1900         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1901                                                    noblock, errcode);
1902         if (skb) {
1903                 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1904                 skb->pkt_type = PACKET_OUTGOING;
1905         }
1906         return skb;
1907 }
1908
1909 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1910                       struct msghdr *msg, size_t size)
1911 {
1912         struct sock *sk = sock->sk;
1913         struct dn_scp *scp = DN_SK(sk);
1914         size_t mss;
1915         struct sk_buff_head *queue = &scp->data_xmit_queue;
1916         int flags = msg->msg_flags;
1917         int err = 0;
1918         size_t sent = 0;
1919         int addr_len = msg->msg_namelen;
1920         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1921         struct sk_buff *skb = NULL;
1922         struct dn_skb_cb *cb;
1923         size_t len;
1924         unsigned char fctype;
1925         long timeo;
1926
1927         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1928                 return -EOPNOTSUPP;
1929
1930         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1931                 return -EINVAL;
1932
1933         lock_sock(sk);
1934         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1935         /*
1936          * The only difference between stream sockets and sequenced packet
1937          * sockets is that the stream sockets always behave as if MSG_EOR
1938          * has been set.
1939          */
1940         if (sock->type == SOCK_STREAM) {
1941                 if (flags & MSG_EOR) {
1942                         err = -EINVAL;
1943                         goto out;
1944                 }
1945                 flags |= MSG_EOR;
1946         }
1947
1948
1949         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1950         if (err)
1951                 goto out_err;
1952
1953         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1954                 err = -EPIPE;
1955                 if (!(flags & MSG_NOSIGNAL))
1956                         send_sig(SIGPIPE, current, 0);
1957                 goto out_err;
1958         }
1959
1960         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1961                 dst_negative_advice(&sk->sk_dst_cache);
1962
1963         mss = scp->segsize_rem;
1964         fctype = scp->services_rem & NSP_FC_MASK;
1965
1966         mss = dn_current_mss(sk, flags);
1967
1968         if (flags & MSG_OOB) {
1969                 queue = &scp->other_xmit_queue;
1970                 if (size > mss) {
1971                         err = -EMSGSIZE;
1972                         goto out;
1973                 }
1974         }
1975
1976         scp->persist_fxn = dn_nsp_xmit_timeout;
1977
1978         while(sent < size) {
1979                 err = sock_error(sk);
1980                 if (err)
1981                         goto out;
1982
1983                 if (signal_pending(current)) {
1984                         err = sock_intr_errno(timeo);
1985                         goto out;
1986                 }
1987
1988                 /*
1989                  * Calculate size that we wish to send.
1990                  */
1991                 len = size - sent;
1992
1993                 if (len > mss)
1994                         len = mss;
1995
1996                 /*
1997                  * Wait for queue size to go down below the window
1998                  * size.
1999                  */
2000                 if (dn_queue_too_long(scp, queue, flags)) {
2001                         if (flags & MSG_DONTWAIT) {
2002                                 err = -EWOULDBLOCK;
2003                                 goto out;
2004                         }
2005
2006                         SOCK_SLEEP_PRE(sk)
2007
2008                         if (dn_queue_too_long(scp, queue, flags))
2009                                 schedule();
2010
2011                         SOCK_SLEEP_POST(sk)
2012
2013                         continue;
2014                 }
2015
2016                 /*
2017                  * Get a suitably sized skb.
2018                  * 64 is a bit of a hack really, but its larger than any
2019                  * link-layer headers and has served us well as a good
2020                  * guess as to their real length.
2021                  */
2022                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2023                                          flags & MSG_DONTWAIT, &err);
2024
2025                 if (err)
2026                         break;
2027
2028                 if (!skb)
2029                         continue;
2030
2031                 cb = DN_SKB_CB(skb);
2032
2033                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2034
2035                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2036                         err = -EFAULT;
2037                         goto out;
2038                 }
2039
2040                 if (flags & MSG_OOB) {
2041                         cb->nsp_flags = 0x30;
2042                         if (fctype != NSP_FC_NONE)
2043                                 scp->flowrem_oth--;
2044                 } else {
2045                         cb->nsp_flags = 0x00;
2046                         if (scp->seg_total == 0)
2047                                 cb->nsp_flags |= 0x20;
2048
2049                         scp->seg_total += len;
2050
2051                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2052                                 cb->nsp_flags |= 0x40;
2053                                 scp->seg_total = 0;
2054                                 if (fctype == NSP_FC_SCMC)
2055                                         scp->flowrem_dat--;
2056                         }
2057                         if (fctype == NSP_FC_SRC)
2058                                 scp->flowrem_dat--;
2059                 }
2060
2061                 sent += len;
2062                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2063                 skb = NULL;
2064
2065                 scp->persist = dn_nsp_persist(sk);
2066
2067         }
2068 out:
2069
2070         if (skb)
2071                 kfree_skb(skb);
2072
2073         release_sock(sk);
2074
2075         return sent ? sent : err;
2076
2077 out_err:
2078         err = sk_stream_error(sk, flags, err);
2079         release_sock(sk);
2080         return err;
2081 }
2082
2083 static int dn_device_event(struct notifier_block *this, unsigned long event,
2084                         void *ptr)
2085 {
2086         struct net_device *dev = (struct net_device *)ptr;
2087
2088         switch(event) {
2089                 case NETDEV_UP:
2090                         dn_dev_up(dev);
2091                         break;
2092                 case NETDEV_DOWN:
2093                         dn_dev_down(dev);
2094                         break;
2095                 default:
2096                         break;
2097         }
2098
2099         return NOTIFY_DONE;
2100 }
2101
2102 static struct notifier_block dn_dev_notifier = {
2103         .notifier_call = dn_device_event,
2104 };
2105
2106 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2107
2108 static struct packet_type dn_dix_packet_type = {
2109         .type =         __constant_htons(ETH_P_DNA_RT),
2110         .dev =          NULL,           /* All devices */
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 (dn_ntohs(dn->sdn_objnamel)) {
2210                 case 0:
2211                         sprintf(buf, "%d", dn->sdn_objnum);
2212                         break;
2213                 default:
2214                         for (i = 0; i < dn_ntohs(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(dn_ntohs(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(dn_ntohs(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         struct seq_file *seq;
2317         int rc = -ENOMEM;
2318         struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2319
2320         if (!s)
2321                 goto out;
2322
2323         rc = seq_open(file, &dn_socket_seq_ops);
2324         if (rc)
2325                 goto out_kfree;
2326
2327         seq             = file->private_data;
2328         seq->private    = s;
2329         memset(s, 0, sizeof(*s));
2330 out:
2331         return rc;
2332 out_kfree:
2333         kfree(s);
2334         goto out;
2335 }
2336
2337 static const struct file_operations dn_socket_seq_fops = {
2338         .owner          = THIS_MODULE,
2339         .open           = dn_socket_seq_open,
2340         .read           = seq_read,
2341         .llseek         = seq_lseek,
2342         .release        = seq_release_private,
2343 };
2344 #endif
2345
2346 static struct net_proto_family  dn_family_ops = {
2347         .family =       AF_DECnet,
2348         .create =       dn_create,
2349         .owner  =       THIS_MODULE,
2350 };
2351
2352 static const struct proto_ops dn_proto_ops = {
2353         .family =       AF_DECnet,
2354         .owner =        THIS_MODULE,
2355         .release =      dn_release,
2356         .bind =         dn_bind,
2357         .connect =      dn_connect,
2358         .socketpair =   sock_no_socketpair,
2359         .accept =       dn_accept,
2360         .getname =      dn_getname,
2361         .poll =         dn_poll,
2362         .ioctl =        dn_ioctl,
2363         .listen =       dn_listen,
2364         .shutdown =     dn_shutdown,
2365         .setsockopt =   dn_setsockopt,
2366         .getsockopt =   dn_getsockopt,
2367         .sendmsg =      dn_sendmsg,
2368         .recvmsg =      dn_recvmsg,
2369         .mmap =         sock_no_mmap,
2370         .sendpage =     sock_no_sendpage,
2371 };
2372
2373 void dn_register_sysctl(void);
2374 void dn_unregister_sysctl(void);
2375
2376 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2377 MODULE_AUTHOR("Linux DECnet Project Team");
2378 MODULE_LICENSE("GPL");
2379 MODULE_ALIAS_NETPROTO(PF_DECnet);
2380
2381 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2382
2383 static int __init decnet_init(void)
2384 {
2385         int rc;
2386
2387         printk(banner);
2388
2389         rc = proto_register(&dn_proto, 1);
2390         if (rc != 0)
2391                 goto out;
2392
2393         dn_neigh_init();
2394         dn_dev_init();
2395         dn_route_init();
2396         dn_fib_init();
2397
2398         sock_register(&dn_family_ops);
2399         dev_add_pack(&dn_dix_packet_type);
2400         register_netdevice_notifier(&dn_dev_notifier);
2401
2402         proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
2403         dn_register_sysctl();
2404 out:
2405         return rc;
2406
2407 }
2408 module_init(decnet_init);
2409
2410 /*
2411  * Prevent DECnet module unloading until its fixed properly.
2412  * Requires an audit of the code to check for memory leaks and
2413  * initialisation problems etc.
2414  */
2415 #if 0
2416 static void __exit decnet_exit(void)
2417 {
2418         sock_unregister(AF_DECnet);
2419         rtnl_unregister_all(PF_DECnet);
2420         dev_remove_pack(&dn_dix_packet_type);
2421
2422         dn_unregister_sysctl();
2423
2424         unregister_netdevice_notifier(&dn_dev_notifier);
2425
2426         dn_route_cleanup();
2427         dn_dev_cleanup();
2428         dn_neigh_cleanup();
2429         dn_fib_cleanup();
2430
2431         proc_net_remove("decnet");
2432
2433         proto_unregister(&dn_proto);
2434 }
2435 module_exit(decnet_exit);
2436 #endif