net/decnet/af_decnet.c

   1
   2 /*
   3  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   4  *              operating system.  DECnet is implemented using the  BSD Socket
   5  *              interface as the means of communication with the user level.
   6  *
   7  *              DECnet Socket Layer Interface
   8  *
   9  * Authors:     Eduardo Marcelo Serrat <emserrat@geocities.com>
  10  *              Patrick Caulfield <patrick@pandh.demon.co.uk>
  11  *
  12  * Changes:
  13  *        Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
  14  *                          version of the code. Original copyright preserved
  15  *                          below.
  16  *        Steve Whitehouse: Some bug fixes, cleaning up some code to make it
  17  *                          compatible with my routing layer.
  18  *        Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
  19  *                          Caulfield.
  20  *        Steve Whitehouse: Further bug fixes, checking module code still works
  21  *                          with new routing layer.
  22  *        Steve Whitehouse: Additional set/get_sockopt() calls.
  23  *        Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
  24  *                          code.
  25  *        Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
  26  *                          way. Didn't manage it entirely, but its better.
  27  *        Steve Whitehouse: ditto for sendmsg().
  28  *        Steve Whitehouse: A selection of bug fixes to various things.
  29  *        Steve Whitehouse: Added TIOCOUTQ ioctl.
  30  *        Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
  31  *        Steve Whitehouse: Fixes to connect() error returns.
  32  *       Patrick Caulfield: Fixes to delayed acceptance logic.
  33  *         David S. Miller: New socket locking
  34  *        Steve Whitehouse: Socket list hashing/locking
  35  *         Arnaldo C. Melo: use capable, not suser
  36  *        Steve Whitehouse: Removed unused code. Fix to use sk->allocation
  37  *                          when required.
  38  *       Patrick Caulfield: /proc/net/decnet now has object name/number
  39  *        Steve Whitehouse: Fixed local port allocation, hashed sk list
  40  *          Matthew Wilcox: Fixes for dn_ioctl()
  41  *        Steve Whitehouse: New connect/accept logic to allow timeouts and
  42  *                          prepare for sendpage etc.
  43  */
  44
  45
  46 /******************************************************************************
  47     (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
  48
  49     This program is free software; you can redistribute it and/or modify
  50     it under the terms of the GNU General Public License as published by
  51     the Free Software Foundation; either version 2 of the License, or
  52     any later version.
  53
  54     This program is distributed in the hope that it will be useful,
  55     but WITHOUT ANY WARRANTY; without even the implied warranty of
  56     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  57     GNU General Public License for more details.
  58
  59 HISTORY:
  60
  61 Version           Kernel     Date       Author/Comments
  62 -------           ------     ----       ---------------
  63 Version 0.0.1     2.0.30    01-dic-97   Eduardo Marcelo Serrat
  64                                         (emserrat@geocities.com)
  65
  66                                         First Development of DECnet Socket La-
  67                                         yer for Linux. Only supports outgoing
  68                                         connections.
  69
  70 Version 0.0.2     2.1.105   20-jun-98   Patrick J. Caulfield
  71                                         (patrick@pandh.demon.co.uk)
  72
  73                                         Port to new kernel development version.
  74
  75 Version 0.0.3     2.1.106   25-jun-98   Eduardo Marcelo Serrat
  76                                         (emserrat@geocities.com)
  77                                         _
  78                                         Added support for incoming connections
  79                                         so we can start developing server apps
  80                                         on Linux.
  81                                         -
  82                                         Module Support
  83 Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
  84                                        (emserrat@geocities.com)
  85                                        _
  86                                         Added support for X11R6.4. Now we can
  87                                         use DECnet transport for X on Linux!!!
  88                                        -
  89 Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
  90                                        (emserrat@geocities.com)
  91                                        Removed bugs on flow control
  92                                        Removed bugs on incoming accessdata
  93                                        order
  94                                        -
  95 Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
  96                                        dn_recvmsg fixes
  97
  98                                         Patrick J. Caulfield
  99                                        dn_bind fixes
 100 *******************************************************************************/
 101
 102 #include <linux/module.h>
 103 #include <linux/errno.h>
 104 #include <linux/types.h>
 105 #include <linux/slab.h>
 106 #include <linux/socket.h>
 107 #include <linux/in.h>
 108 #include <linux/kernel.h>
 109 #include <linux/sched.h>
 110 #include <linux/timer.h>
 111 #include <linux/string.h>
 112 #include <linux/sockios.h>
 113 #include <linux/net.h>
 114 #include <linux/netdevice.h>
 115 #include <linux/inet.h>
 116 #include <linux/route.h>
 117 #include <linux/netfilter.h>
 118 #include <linux/seq_file.h>
 119 #include <net/sock.h>
 120 #include <net/tcp_states.h>
 121 #include <net/flow.h>
 122 #include <asm/system.h>
 123 #include <asm/ioctls.h>
 124 #include <linux/capability.h>
 125 #include <linux/mm.h>
 126 #include <linux/interrupt.h>
 127 #include <linux/proc_fs.h>
 128 #include <linux/stat.h>
 129 #include <linux/init.h>
 130 #include <linux/poll.h>
 131 #include <net/net_namespace.h>
 132 #include <net/neighbour.h>
 133 #include <net/dst.h>
 134 #include <net/fib_rules.h>
 135 #include <net/dn.h>
 136 #include <net/dn_nsp.h>
 137 #include <net/dn_dev.h>
 138 #include <net/dn_route.h>
 139 #include <net/dn_fib.h>
 140 #include <net/dn_neigh.h>
 141
 142 struct dn_sock {
 143         struct sock sk;
 144         struct dn_scp scp;
 145 };
 146
 147 static void dn_keepalive(struct sock *sk);
 148
 149 #define DN_SK_HASH_SHIFT 8
 150 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
 151 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
 152
 153
 154 static const struct proto_ops dn_proto_ops;
 155 static DEFINE_RWLOCK(dn_hash_lock);
 156 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 157 static struct hlist_head dn_wild_sk;
 158 static atomic_long_t decnet_memory_allocated;
 159
 160 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
 161 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 162
 163 static struct hlist_head *dn_find_list(struct sock *sk)
 164 {
 165         struct dn_scp *scp = DN_SK(sk);
 166
 167         if (scp->addr.sdn_flags & SDF_WILD)
 168                 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
 169
 170         return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
 171 }
 172
 173 /*
 174  * Valid ports are those greater than zero and not already in use.
 175  */
 176 static int check_port(__le16 port)
 177 {
 178         struct sock *sk;
 179         struct hlist_node *node;
 180
 181         if (port == 0)
 182                 return -1;
 183
 184         sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
 185                 struct dn_scp *scp = DN_SK(sk);
 186                 if (scp->addrloc == port)
 187                         return -1;
 188         }
 189         return 0;
 190 }
 191
 192 static unsigned short port_alloc(struct sock *sk)
 193 {
 194         struct dn_scp *scp = DN_SK(sk);
 195 static unsigned short port = 0x2000;
 196         unsigned short i_port = port;
 197
 198         while(check_port(cpu_to_le16(++port)) != 0) {
 199                 if (port == i_port)
 200                         return 0;
 201         }
 202
 203         scp->addrloc = cpu_to_le16(port);
 204
 205         return 1;
 206 }
 207
 208 /*
 209  * Since this is only ever called from user
 210  * level, we don't need a write_lock() version
 211  * of this.
 212  */
 213 static int dn_hash_sock(struct sock *sk)
 214 {
 215         struct dn_scp *scp = DN_SK(sk);
 216         struct hlist_head *list;
 217         int rv = -EUSERS;
 218
 219         BUG_ON(sk_hashed(sk));
 220
 221         write_lock_bh(&dn_hash_lock);
 222
 223         if (!scp->addrloc && !port_alloc(sk))
 224                 goto out;
 225
 226         rv = -EADDRINUSE;
 227         if ((list = dn_find_list(sk)) == NULL)
 228                 goto out;
 229
 230         sk_add_node(sk, list);
 231         rv = 0;
 232 out:
 233         write_unlock_bh(&dn_hash_lock);
 234         return rv;
 235 }
 236
 237 static void dn_unhash_sock(struct sock *sk)
 238 {
 239         write_lock(&dn_hash_lock);
 240         sk_del_node_init(sk);
 241         write_unlock(&dn_hash_lock);
 242 }
 243
 244 static void dn_unhash_sock_bh(struct sock *sk)
 245 {
 246         write_lock_bh(&dn_hash_lock);
 247         sk_del_node_init(sk);
 248         write_unlock_bh(&dn_hash_lock);
 249 }
 250
 251 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
 252 {
 253         int i;
 254         unsigned hash = addr->sdn_objnum;
 255
 256         if (hash == 0) {
 257                 hash = addr->sdn_objnamel;
 258                 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
 259                         hash ^= addr->sdn_objname[i];
 260                         hash ^= (hash << 3);
 261                 }
 262         }
 263
 264         return &dn_sk_hash[hash & DN_SK_HASH_MASK];
 265 }
 266
 267 /*
 268  * Called to transform a socket from bound (i.e. with a local address)
 269  * into a listening socket (doesn't need a local port number) and rehashes
 270  * based upon the object name/number.
 271  */
 272 static void dn_rehash_sock(struct sock *sk)
 273 {
 274         struct hlist_head *list;
 275         struct dn_scp *scp = DN_SK(sk);
 276
 277         if (scp->addr.sdn_flags & SDF_WILD)
 278                 return;
 279
 280         write_lock_bh(&dn_hash_lock);
 281         sk_del_node_init(sk);
 282         DN_SK(sk)->addrloc = 0;
 283         list = listen_hash(&DN_SK(sk)->addr);
 284         sk_add_node(sk, list);
 285         write_unlock_bh(&dn_hash_lock);
 286 }
 287
 288 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
 289 {
 290         int len = 2;
 291
 292         *buf++ = type;
 293
 294         switch (type) {
 295         case 0:
 296                 *buf++ = sdn->sdn_objnum;
 297                 break;
 298         case 1:
 299                 *buf++ = 0;
 300                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
 301                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 302                 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
 303                 break;
 304         case 2:
 305                 memset(buf, 0, 5);
 306                 buf += 5;
 307                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
 308                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 309                 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
 310                 break;
 311         }
 312
 313         return len;
 314 }
 315
 316 /*
 317  * On reception of usernames, we handle types 1 and 0 for destination
 318  * addresses only. Types 2 and 4 are used for source addresses, but the
 319  * UIC, GIC are ignored and they are both treated the same way. Type 3
 320  * is never used as I've no idea what its purpose might be or what its
 321  * format is.
 322  */
 323 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
 324 {
 325         unsigned char type;
 326         int size = len;
 327         int namel = 12;
 328
 329         sdn->sdn_objnum = 0;
 330         sdn->sdn_objnamel = cpu_to_le16(0);
 331         memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 332
 333         if (len < 2)
 334                 return -1;
 335
 336         len -= 2;
 337         *fmt = *data++;
 338         type = *data++;
 339
 340         switch (*fmt) {
 341         case 0:
 342                 sdn->sdn_objnum = type;
 343                 return 2;
 344         case 1:
 345                 namel = 16;
 346                 break;
 347         case 2:
 348                 len  -= 4;
 349                 data += 4;
 350                 break;
 351         case 4:
 352                 len  -= 8;
 353                 data += 8;
 354                 break;
 355         default:
 356                 return -1;
 357         }
 358
 359         len -= 1;
 360
 361         if (len < 0)
 362                 return -1;
 363
 364         sdn->sdn_objnamel = cpu_to_le16(*data++);
 365         len -= le16_to_cpu(sdn->sdn_objnamel);
 366
 367         if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
 368                 return -1;
 369
 370         memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
 371
 372         return size - len;
 373 }
 374
 375 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
 376 {
 377         struct hlist_head *list = listen_hash(addr);
 378         struct hlist_node *node;
 379         struct sock *sk;
 380
 381         read_lock(&dn_hash_lock);
 382         sk_for_each(sk, node, list) {
 383                 struct dn_scp *scp = DN_SK(sk);
 384                 if (sk->sk_state != TCP_LISTEN)
 385                         continue;
 386                 if (scp->addr.sdn_objnum) {
 387                         if (scp->addr.sdn_objnum != addr->sdn_objnum)
 388                                 continue;
 389                 } else {
 390                         if (addr->sdn_objnum)
 391                                 continue;
 392                         if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 393                                 continue;
 394                         if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
 395                                 continue;
 396                 }
 397                 sock_hold(sk);
 398                 read_unlock(&dn_hash_lock);
 399                 return sk;
 400         }
 401
 402         sk = sk_head(&dn_wild_sk);
 403         if (sk) {
 404                 if (sk->sk_state == TCP_LISTEN)
 405                         sock_hold(sk);
 406                 else
 407                         sk = NULL;
 408         }
 409
 410         read_unlock(&dn_hash_lock);
 411         return sk;
 412 }
 413
 414 struct sock *dn_find_by_skb(struct sk_buff *skb)
 415 {
 416         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 417         struct sock *sk;
 418         struct hlist_node *node;
 419         struct dn_scp *scp;
 420
 421         read_lock(&dn_hash_lock);
 422         sk_for_each(sk, node, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
 423                 scp = DN_SK(sk);
 424                 if (cb->src != dn_saddr2dn(&scp->peer))
 425                         continue;
 426                 if (cb->dst_port != scp->addrloc)
 427                         continue;
 428                 if (scp->addrrem && (cb->src_port != scp->addrrem))
 429                         continue;
 430                 sock_hold(sk);
 431                 goto found;
 432         }
 433         sk = NULL;
 434 found:
 435         read_unlock(&dn_hash_lock);
 436         return sk;
 437 }
 438
 439
 440
 441 static void dn_destruct(struct sock *sk)
 442 {
 443         struct dn_scp *scp = DN_SK(sk);
 444
 445         skb_queue_purge(&scp->data_xmit_queue);
 446         skb_queue_purge(&scp->other_xmit_queue);
 447         skb_queue_purge(&scp->other_receive_queue);
 448
 449         dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
 450 }
 451
 452 static int dn_memory_pressure;
 453
 454 static void dn_enter_memory_pressure(struct sock *sk)
 455 {
 456         if (!dn_memory_pressure) {
 457                 dn_memory_pressure = 1;
 458         }
 459 }
 460
 461 static struct proto dn_proto = {
 462         .name                   = "NSP",
 463         .owner                  = THIS_MODULE,
 464         .enter_memory_pressure  = dn_enter_memory_pressure,
 465         .memory_pressure        = &dn_memory_pressure,
 466         .memory_allocated       = &decnet_memory_allocated,
 467         .sysctl_mem             = sysctl_decnet_mem,
 468         .sysctl_wmem            = sysctl_decnet_wmem,
 469         .sysctl_rmem            = sysctl_decnet_rmem,
 470         .max_header             = DN_MAX_NSP_DATA_HEADER + 64,
 471         .obj_size               = sizeof(struct dn_sock),
 472 };
 473
 474 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp)
 475 {
 476         struct dn_scp *scp;
 477         struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto);
 478
 479         if  (!sk)
 480                 goto out;
 481
 482         if (sock)
 483                 sock->ops = &dn_proto_ops;
 484         sock_init_data(sock, sk);
 485
 486         sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 487         sk->sk_destruct    = dn_destruct;
 488         sk->sk_no_check    = 1;
 489         sk->sk_family      = PF_DECnet;
 490         sk->sk_protocol    = 0;
 491         sk->sk_allocation  = gfp;
 492         sk->sk_sndbuf      = sysctl_decnet_wmem[1];
 493         sk->sk_rcvbuf      = sysctl_decnet_rmem[1];
 494
 495         /* Initialization of DECnet Session Control Port                */
 496         scp = DN_SK(sk);
 497         scp->state      = DN_O;         /* Open                 */
 498         scp->numdat     = 1;            /* Next data seg to tx  */
 499         scp->numoth     = 1;            /* Next oth data to tx  */
 500         scp->ackxmt_dat = 0;            /* Last data seg ack'ed */
 501         scp->ackxmt_oth = 0;            /* Last oth data ack'ed */
 502         scp->ackrcv_dat = 0;            /* Highest data ack recv*/
 503         scp->ackrcv_oth = 0;            /* Last oth data ack rec*/
 504         scp->flowrem_sw = DN_SEND;
 505         scp->flowloc_sw = DN_SEND;
 506         scp->flowrem_dat = 0;
 507         scp->flowrem_oth = 1;
 508         scp->flowloc_dat = 0;
 509         scp->flowloc_oth = 1;
 510         scp->services_rem = 0;
 511         scp->services_loc = 1 | NSP_FC_NONE;
 512         scp->info_rem = 0;
 513         scp->info_loc = 0x03; /* NSP version 4.1 */
 514         scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 515         scp->nonagle = 0;
 516         scp->multi_ireq = 1;
 517         scp->accept_mode = ACC_IMMED;
 518         scp->addr.sdn_family    = AF_DECnet;
 519         scp->peer.sdn_family    = AF_DECnet;
 520         scp->accessdata.acc_accl = 5;
 521         memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 522
 523         scp->max_window   = NSP_MAX_WINDOW;
 524         scp->snd_window   = NSP_MIN_WINDOW;
 525         scp->nsp_srtt     = NSP_INITIAL_SRTT;
 526         scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 527         scp->nsp_rxtshift = 0;
 528
 529         skb_queue_head_init(&scp->data_xmit_queue);
 530         skb_queue_head_init(&scp->other_xmit_queue);
 531         skb_queue_head_init(&scp->other_receive_queue);
 532
 533         scp->persist = 0;
 534         scp->persist_fxn = NULL;
 535         scp->keepalive = 10 * HZ;
 536         scp->keepalive_fxn = dn_keepalive;
 537
 538         init_timer(&scp->delack_timer);
 539         scp->delack_pending = 0;
 540         scp->delack_fxn = dn_nsp_delayed_ack;
 541
 542         dn_start_slow_timer(sk);
 543 out:
 544         return sk;
 545 }
 546
 547 /*
 548  * Keepalive timer.
 549  * FIXME: Should respond to SO_KEEPALIVE etc.
 550  */
 551 static void dn_keepalive(struct sock *sk)
 552 {
 553         struct dn_scp *scp = DN_SK(sk);
 554
 555         /*
 556          * By checking the other_data transmit queue is empty
 557          * we are double checking that we are not sending too
 558          * many of these keepalive frames.
 559          */
 560         if (skb_queue_empty(&scp->other_xmit_queue))
 561                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 562 }
 563
 564
 565 /*
 566  * Timer for shutdown/destroyed sockets.
 567  * When socket is dead & no packets have been sent for a
 568  * certain amount of time, they are removed by this
 569  * routine. Also takes care of sending out DI & DC
 570  * frames at correct times.
 571  */
 572 int dn_destroy_timer(struct sock *sk)
 573 {
 574         struct dn_scp *scp = DN_SK(sk);
 575
 576         scp->persist = dn_nsp_persist(sk);
 577
 578         switch (scp->state) {
 579         case DN_DI:
 580                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 581                 if (scp->nsp_rxtshift >= decnet_di_count)
 582                         scp->state = DN_CN;
 583                 return 0;
 584
 585         case DN_DR:
 586                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 587                 if (scp->nsp_rxtshift >= decnet_dr_count)
 588                         scp->state = DN_DRC;
 589                 return 0;
 590
 591         case DN_DN:
 592                 if (scp->nsp_rxtshift < decnet_dn_count) {
 593                         /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 594                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 595                                          GFP_ATOMIC);
 596                         return 0;
 597                 }
 598         }
 599
 600         scp->persist = (HZ * decnet_time_wait);
 601
 602         if (sk->sk_socket)
 603                 return 0;
 604
 605         if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
 606                 dn_unhash_sock(sk);
 607                 sock_put(sk);
 608                 return 1;
 609         }
 610
 611         return 0;
 612 }
 613
 614 static void dn_destroy_sock(struct sock *sk)
 615 {
 616         struct dn_scp *scp = DN_SK(sk);
 617
 618         scp->nsp_rxtshift = 0; /* reset back off */
 619
 620         if (sk->sk_socket) {
 621                 if (sk->sk_socket->state != SS_UNCONNECTED)
 622                         sk->sk_socket->state = SS_DISCONNECTING;
 623         }
 624
 625         sk->sk_state = TCP_CLOSE;
 626
 627         switch (scp->state) {
 628         case DN_DN:
 629                 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 630                                  sk->sk_allocation);
 631                 scp->persist_fxn = dn_destroy_timer;
 632                 scp->persist = dn_nsp_persist(sk);
 633                 break;
 634         case DN_CR:
 635                 scp->state = DN_DR;
 636                 goto disc_reject;
 637         case DN_RUN:
 638                 scp->state = DN_DI;
 639         case DN_DI:
 640         case DN_DR:
 641 disc_reject:
 642                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 643         case DN_NC:
 644         case DN_NR:
 645         case DN_RJ:
 646         case DN_DIC:
 647         case DN_CN:
 648         case DN_DRC:
 649         case DN_CI:
 650         case DN_CD:
 651                 scp->persist_fxn = dn_destroy_timer;
 652                 scp->persist = dn_nsp_persist(sk);
 653                 break;
 654         default:
 655                 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 656         case DN_O:
 657                 dn_stop_slow_timer(sk);
 658
 659                 dn_unhash_sock_bh(sk);
 660                 sock_put(sk);
 661
 662                 break;
 663         }
 664 }
 665
 666 char *dn_addr2asc(__u16 addr, char *buf)
 667 {
 668         unsigned short node, area;
 669
 670         node = addr & 0x03ff;
 671         area = addr >> 10;
 672         sprintf(buf, "%hd.%hd", area, node);
 673
 674         return buf;
 675 }
 676
 677
 678
 679 static int dn_create(struct net *net, struct socket *sock, int protocol,
 680                      int kern)
 681 {
 682         struct sock *sk;
 683
 684         if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
 685                 return -EINVAL;
 686
 687         if (!net_eq(net, &init_net))
 688                 return -EAFNOSUPPORT;
 689
 690         switch (sock->type) {
 691         case SOCK_SEQPACKET:
 692                 if (protocol != DNPROTO_NSP)
 693                         return -EPROTONOSUPPORT;
 694                 break;
 695         case SOCK_STREAM:
 696                 break;
 697         default:
 698                 return -ESOCKTNOSUPPORT;
 699         }
 700
 701
 702         if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
 703                 return -ENOBUFS;
 704
 705         sk->sk_protocol = protocol;
 706
 707         return 0;
 708 }
 709
 710
 711 static int
 712 dn_release(struct socket *sock)
 713 {
 714         struct sock *sk = sock->sk;
 715
 716         if (sk) {
 717                 sock_orphan(sk);
 718                 sock_hold(sk);
 719                 lock_sock(sk);
 720                 dn_destroy_sock(sk);
 721                 release_sock(sk);
 722                 sock_put(sk);
 723         }
 724
 725         return 0;
 726 }
 727
 728 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 729 {
 730         struct sock *sk = sock->sk;
 731         struct dn_scp *scp = DN_SK(sk);
 732         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 733         struct net_device *dev, *ldev;
 734         int rv;
 735
 736         if (addr_len != sizeof(struct sockaddr_dn))
 737                 return -EINVAL;
 738
 739         if (saddr->sdn_family != AF_DECnet)
 740                 return -EINVAL;
 741
 742         if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
 743                 return -EINVAL;
 744
 745         if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
 746                 return -EINVAL;
 747
 748         if (saddr->sdn_flags & ~SDF_WILD)
 749                 return -EINVAL;
 750
 751         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 752             (saddr->sdn_flags & SDF_WILD)))
 753                 return -EACCES;
 754
 755         if (!(saddr->sdn_flags & SDF_WILD)) {
 756                 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
 757                         rcu_read_lock();
 758                         ldev = NULL;
 759                         for_each_netdev_rcu(&init_net, dev) {
 760                                 if (!dev->dn_ptr)
 761                                         continue;
 762                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 763                                         ldev = dev;
 764                                         break;
 765                                 }
 766                         }
 767                         rcu_read_unlock();
 768                         if (ldev == NULL)
 769                                 return -EADDRNOTAVAIL;
 770                 }
 771         }
 772
 773         rv = -EINVAL;
 774         lock_sock(sk);
 775         if (sock_flag(sk, SOCK_ZAPPED)) {
 776                 memcpy(&scp->addr, saddr, addr_len);
 777                 sock_reset_flag(sk, SOCK_ZAPPED);
 778
 779                 rv = dn_hash_sock(sk);
 780                 if (rv)
 781                         sock_set_flag(sk, SOCK_ZAPPED);
 782         }
 783         release_sock(sk);
 784
 785         return rv;
 786 }
 787
 788
 789 static int dn_auto_bind(struct socket *sock)
 790 {
 791         struct sock *sk = sock->sk;
 792         struct dn_scp *scp = DN_SK(sk);
 793         int rv;
 794
 795         sock_reset_flag(sk, SOCK_ZAPPED);
 796
 797         scp->addr.sdn_flags  = 0;
 798         scp->addr.sdn_objnum = 0;
 799
 800         /*
 801          * This stuff is to keep compatibility with Eduardo's
 802          * patch. I hope I can dispense with it shortly...
 803          */
 804         if ((scp->accessdata.acc_accl != 0) &&
 805                 (scp->accessdata.acc_accl <= 12)) {
 806
 807                 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
 808                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
 809
 810                 scp->accessdata.acc_accl = 0;
 811                 memset(scp->accessdata.acc_acc, 0, 40);
 812         }
 813         /* End of compatibility stuff */
 814
 815         scp->addr.sdn_add.a_len = cpu_to_le16(2);
 816         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 817         if (rv == 0) {
 818                 rv = dn_hash_sock(sk);
 819                 if (rv)
 820                         sock_set_flag(sk, SOCK_ZAPPED);
 821         }
 822
 823         return rv;
 824 }
 825
 826 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 827 {
 828         struct dn_scp *scp = DN_SK(sk);
 829         DEFINE_WAIT(wait);
 830         int err;
 831
 832         if (scp->state != DN_CR)
 833                 return -EINVAL;
 834
 835         scp->state = DN_CC;
 836         scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
 837         dn_send_conn_conf(sk, allocation);
 838
 839         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 840         for(;;) {
 841                 release_sock(sk);
 842                 if (scp->state == DN_CC)
 843                         *timeo = schedule_timeout(*timeo);
 844                 lock_sock(sk);
 845                 err = 0;
 846                 if (scp->state == DN_RUN)
 847                         break;
 848                 err = sock_error(sk);
 849                 if (err)
 850                         break;
 851                 err = sock_intr_errno(*timeo);
 852                 if (signal_pending(current))
 853                         break;
 854                 err = -EAGAIN;
 855                 if (!*timeo)
 856                         break;
 857                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 858         }
 859         finish_wait(sk_sleep(sk), &wait);
 860         if (err == 0) {
 861                 sk->sk_socket->state = SS_CONNECTED;
 862         } else if (scp->state != DN_CC) {
 863                 sk->sk_socket->state = SS_UNCONNECTED;
 864         }
 865         return err;
 866 }
 867
 868 static int dn_wait_run(struct sock *sk, long *timeo)
 869 {
 870         struct dn_scp *scp = DN_SK(sk);
 871         DEFINE_WAIT(wait);
 872         int err = 0;
 873
 874         if (scp->state == DN_RUN)
 875                 goto out;
 876
 877         if (!*timeo)
 878                 return -EALREADY;
 879
 880         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 881         for(;;) {
 882                 release_sock(sk);
 883                 if (scp->state == DN_CI || scp->state == DN_CC)
 884                         *timeo = schedule_timeout(*timeo);
 885                 lock_sock(sk);
 886                 err = 0;
 887                 if (scp->state == DN_RUN)
 888                         break;
 889                 err = sock_error(sk);
 890                 if (err)
 891                         break;
 892                 err = sock_intr_errno(*timeo);
 893                 if (signal_pending(current))
 894                         break;
 895                 err = -ETIMEDOUT;
 896                 if (!*timeo)
 897                         break;
 898                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 899         }
 900         finish_wait(sk_sleep(sk), &wait);
 901 out:
 902         if (err == 0) {
 903                 sk->sk_socket->state = SS_CONNECTED;
 904         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 905                 sk->sk_socket->state = SS_UNCONNECTED;
 906         }
 907         return err;
 908 }
 909
 910 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 911 {
 912         struct socket *sock = sk->sk_socket;
 913         struct dn_scp *scp = DN_SK(sk);
 914         int err = -EISCONN;
 915         struct flowidn fld;
 916
 917         if (sock->state == SS_CONNECTED)
 918                 goto out;
 919
 920         if (sock->state == SS_CONNECTING) {
 921                 err = 0;
 922                 if (scp->state == DN_RUN) {
 923                         sock->state = SS_CONNECTED;
 924                         goto out;
 925                 }
 926                 err = -ECONNREFUSED;
 927                 if (scp->state != DN_CI && scp->state != DN_CC) {
 928                         sock->state = SS_UNCONNECTED;
 929                         goto out;
 930                 }
 931                 return dn_wait_run(sk, timeo);
 932         }
 933
 934         err = -EINVAL;
 935         if (scp->state != DN_O)
 936                 goto out;
 937
 938         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 939                 goto out;
 940         if (addr->sdn_family != AF_DECnet)
 941                 goto out;
 942         if (addr->sdn_flags & SDF_WILD)
 943                 goto out;
 944
 945         if (sock_flag(sk, SOCK_ZAPPED)) {
 946                 err = dn_auto_bind(sk->sk_socket);
 947                 if (err)
 948                         goto out;
 949         }
 950
 951         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 952
 953         err = -EHOSTUNREACH;
 954         memset(&fld, 0, sizeof(fld));
 955         fld.flowidn_oif = sk->sk_bound_dev_if;
 956         fld.daddr = dn_saddr2dn(&scp->peer);
 957         fld.saddr = dn_saddr2dn(&scp->addr);
 958         dn_sk_ports_copy(&fld, scp);
 959         fld.flowidn_proto = DNPROTO_NSP;
 960         if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
 961                 goto out;
 962         sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 963         sock->state = SS_CONNECTING;
 964         scp->state = DN_CI;
 965         scp->segsize_loc = dst_metric_advmss(sk->sk_dst_cache);
 966
 967         dn_nsp_send_conninit(sk, NSP_CI);
 968         err = -EINPROGRESS;
 969         if (*timeo) {
 970                 err = dn_wait_run(sk, timeo);
 971         }
 972 out:
 973         return err;
 974 }
 975
 976 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 977 {
 978         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 979         struct sock *sk = sock->sk;
 980         int err;
 981         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 982
 983         lock_sock(sk);
 984         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 985         release_sock(sk);
 986
 987         return err;
 988 }
 989
 990 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 991 {
 992         struct dn_scp *scp = DN_SK(sk);
 993
 994         switch (scp->state) {
 995         case DN_RUN:
 996                 return 0;
 997         case DN_CR:
 998                 return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 999         case DN_CI:
1000         case DN_CC:
1001                 return dn_wait_run(sk, timeo);
1002         case DN_O:
1003                 return __dn_connect(sk, addr, addrlen, timeo, flags);
1004         }
1005
1006         return -EINVAL;
1007 }
1008
1009
1010 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1011 {
1012         unsigned char *ptr = skb->data;
1013
1014         acc->acc_userl = *ptr++;
1015         memcpy(&acc->acc_user, ptr, acc->acc_userl);
1016         ptr += acc->acc_userl;
1017
1018         acc->acc_passl = *ptr++;
1019         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1020         ptr += acc->acc_passl;
1021
1022         acc->acc_accl = *ptr++;
1023         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1024
1025         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1026
1027 }
1028
1029 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1030 {
1031         unsigned char *ptr = skb->data;
1032         u16 len = *ptr++; /* yes, it's 8bit on the wire */
1033
1034         BUG_ON(len > 16); /* we've checked the contents earlier */
1035         opt->opt_optl   = cpu_to_le16(len);
1036         opt->opt_status = 0;
1037         memcpy(opt->opt_data, ptr, len);
1038         skb_pull(skb, len + 1);
1039 }
1040
1041 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1042 {
1043         DEFINE_WAIT(wait);
1044         struct sk_buff *skb = NULL;
1045         int err = 0;
1046
1047         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1048         for(;;) {
1049                 release_sock(sk);
1050                 skb = skb_dequeue(&sk->sk_receive_queue);
1051                 if (skb == NULL) {
1052                         *timeo = schedule_timeout(*timeo);
1053                         skb = skb_dequeue(&sk->sk_receive_queue);
1054                 }
1055                 lock_sock(sk);
1056                 if (skb != NULL)
1057                         break;
1058                 err = -EINVAL;
1059                 if (sk->sk_state != TCP_LISTEN)
1060                         break;
1061                 err = sock_intr_errno(*timeo);
1062                 if (signal_pending(current))
1063                         break;
1064                 err = -EAGAIN;
1065                 if (!*timeo)
1066                         break;
1067                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1068         }
1069         finish_wait(sk_sleep(sk), &wait);
1070
1071         return skb == NULL ? ERR_PTR(err) : skb;
1072 }
1073
1074 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1075 {
1076         struct sock *sk = sock->sk, *newsk;
1077         struct sk_buff *skb = NULL;
1078         struct dn_skb_cb *cb;
1079         unsigned char menuver;
1080         int err = 0;
1081         unsigned char type;
1082         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1083         struct dst_entry *dst;
1084
1085         lock_sock(sk);
1086
1087         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1088                 release_sock(sk);
1089                 return -EINVAL;
1090         }
1091
1092         skb = skb_dequeue(&sk->sk_receive_queue);
1093         if (skb == NULL) {
1094                 skb = dn_wait_for_connect(sk, &timeo);
1095                 if (IS_ERR(skb)) {
1096                         release_sock(sk);
1097                         return PTR_ERR(skb);
1098                 }
1099         }
1100
1101         cb = DN_SKB_CB(skb);
1102         sk->sk_ack_backlog--;
1103         newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1104         if (newsk == NULL) {
1105                 release_sock(sk);
1106                 kfree_skb(skb);
1107                 return -ENOBUFS;
1108         }
1109         release_sock(sk);
1110
1111         dst = skb_dst(skb);
1112         sk_dst_set(newsk, dst);
1113         skb_dst_set(skb, NULL);
1114
1115         DN_SK(newsk)->state        = DN_CR;
1116         DN_SK(newsk)->addrrem      = cb->src_port;
1117         DN_SK(newsk)->services_rem = cb->services;
1118         DN_SK(newsk)->info_rem     = cb->info;
1119         DN_SK(newsk)->segsize_rem  = cb->segsize;
1120         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1121
1122         if (DN_SK(newsk)->segsize_rem < 230)
1123                 DN_SK(newsk)->segsize_rem = 230;
1124
1125         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1126                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1127
1128         newsk->sk_state  = TCP_LISTEN;
1129         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1130
1131         /*
1132          * If we are listening on a wild socket, we don't want
1133          * the newly created socket on the wrong hash queue.
1134          */
1135         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1136
1137         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1138         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1139         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1140         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1141
1142         menuver = *skb->data;
1143         skb_pull(skb, 1);
1144
1145         if (menuver & DN_MENUVER_ACC)
1146                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1147
1148         if (menuver & DN_MENUVER_USR)
1149                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1150
1151         if (menuver & DN_MENUVER_PRX)
1152                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1153
1154         if (menuver & DN_MENUVER_UIC)
1155                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1156
1157         kfree_skb(skb);
1158
1159         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1160                 sizeof(struct optdata_dn));
1161         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1162                 sizeof(struct optdata_dn));
1163
1164         lock_sock(newsk);
1165         err = dn_hash_sock(newsk);
1166         if (err == 0) {
1167                 sock_reset_flag(newsk, SOCK_ZAPPED);
1168                 dn_send_conn_ack(newsk);
1169
1170                 /*
1171                  * Here we use sk->sk_allocation since although the conn conf is
1172                  * for the newsk, the context is the old socket.
1173                  */
1174                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1175                         err = dn_confirm_accept(newsk, &timeo,
1176                                                 sk->sk_allocation);
1177         }
1178         release_sock(newsk);
1179         return err;
1180 }
1181
1182
1183 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1184 {
1185         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1186         struct sock *sk = sock->sk;
1187         struct dn_scp *scp = DN_SK(sk);
1188
1189         *uaddr_len = sizeof(struct sockaddr_dn);
1190
1191         lock_sock(sk);
1192
1193         if (peer) {
1194                 if ((sock->state != SS_CONNECTED &&
1195                      sock->state != SS_CONNECTING) &&
1196                     scp->accept_mode == ACC_IMMED) {
1197                         release_sock(sk);
1198                         return -ENOTCONN;
1199                 }
1200
1201                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1202         } else {
1203                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1204         }
1205
1206         release_sock(sk);
1207
1208         return 0;
1209 }
1210
1211
1212 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1213 {
1214         struct sock *sk = sock->sk;
1215         struct dn_scp *scp = DN_SK(sk);
1216         int mask = datagram_poll(file, sock, wait);
1217
1218         if (!skb_queue_empty(&scp->other_receive_queue))
1219                 mask |= POLLRDBAND;
1220
1221         return mask;
1222 }
1223
1224 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1225 {
1226         struct sock *sk = sock->sk;
1227         struct dn_scp *scp = DN_SK(sk);
1228         int err = -EOPNOTSUPP;
1229         long amount = 0;
1230         struct sk_buff *skb;
1231         int val;
1232
1233         switch(cmd)
1234         {
1235         case SIOCGIFADDR:
1236         case SIOCSIFADDR:
1237                 return dn_dev_ioctl(cmd, (void __user *)arg);
1238
1239         case SIOCATMARK:
1240                 lock_sock(sk);
1241                 val = !skb_queue_empty(&scp->other_receive_queue);
1242                 if (scp->state != DN_RUN)
1243                         val = -ENOTCONN;
1244                 release_sock(sk);
1245                 return val;
1246
1247         case TIOCOUTQ:
1248                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1249                 if (amount < 0)
1250                         amount = 0;
1251                 err = put_user(amount, (int __user *)arg);
1252                 break;
1253
1254         case TIOCINQ:
1255                 lock_sock(sk);
1256                 skb = skb_peek(&scp->other_receive_queue);
1257                 if (skb) {
1258                         amount = skb->len;
1259                 } else {
1260                         skb_queue_walk(&sk->sk_receive_queue, skb)
1261                                 amount += skb->len;
1262                 }
1263                 release_sock(sk);
1264                 err = put_user(amount, (int __user *)arg);
1265                 break;
1266
1267         default:
1268                 err = -ENOIOCTLCMD;
1269                 break;
1270         }
1271
1272         return err;
1273 }
1274
1275 static int dn_listen(struct socket *sock, int backlog)
1276 {
1277         struct sock *sk = sock->sk;
1278         int err = -EINVAL;
1279
1280         lock_sock(sk);
1281
1282         if (sock_flag(sk, SOCK_ZAPPED))
1283                 goto out;
1284
1285         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1286                 goto out;
1287
1288         sk->sk_max_ack_backlog = backlog;
1289         sk->sk_ack_backlog     = 0;
1290         sk->sk_state           = TCP_LISTEN;
1291         err                 = 0;
1292         dn_rehash_sock(sk);
1293
1294 out:
1295         release_sock(sk);
1296
1297         return err;
1298 }
1299
1300
1301 static int dn_shutdown(struct socket *sock, int how)
1302 {
1303         struct sock *sk = sock->sk;
1304         struct dn_scp *scp = DN_SK(sk);
1305         int err = -ENOTCONN;
1306
1307         lock_sock(sk);
1308
1309         if (sock->state == SS_UNCONNECTED)
1310                 goto out;
1311
1312         err = 0;
1313         if (sock->state == SS_DISCONNECTING)
1314                 goto out;
1315
1316         err = -EINVAL;
1317         if (scp->state == DN_O)
1318                 goto out;
1319
1320         if (how != SHUTDOWN_MASK)
1321                 goto out;
1322
1323         sk->sk_shutdown = how;
1324         dn_destroy_sock(sk);
1325         err = 0;
1326
1327 out:
1328         release_sock(sk);
1329
1330         return err;
1331 }
1332
1333 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1334 {
1335         struct sock *sk = sock->sk;
1336         int err;
1337
1338         lock_sock(sk);
1339         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1340         release_sock(sk);
1341 #ifdef CONFIG_NETFILTER
1342         /* we need to exclude all possible ENOPROTOOPTs except default case */
1343         if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
1344             optname != DSO_STREAM && optname != DSO_SEQPACKET)
1345                 err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1346 #endif
1347
1348         return err;
1349 }
1350
1351 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1352 {
1353         struct  sock *sk = sock->sk;
1354         struct dn_scp *scp = DN_SK(sk);
1355         long timeo;
1356         union {
1357                 struct optdata_dn opt;
1358                 struct accessdata_dn acc;
1359                 int mode;
1360                 unsigned long win;
1361                 int val;
1362                 unsigned char services;
1363                 unsigned char info;
1364         } u;
1365         int err;
1366
1367         if (optlen && !optval)
1368                 return -EINVAL;
1369
1370         if (optlen > sizeof(u))
1371                 return -EINVAL;
1372
1373         if (copy_from_user(&u, optval, optlen))
1374                 return -EFAULT;
1375
1376         switch (optname) {
1377         case DSO_CONDATA:
1378                 if (sock->state == SS_CONNECTED)
1379                         return -EISCONN;
1380                 if ((scp->state != DN_O) && (scp->state != DN_CR))
1381                         return -EINVAL;
1382
1383                 if (optlen != sizeof(struct optdata_dn))
1384                         return -EINVAL;
1385
1386                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1387                         return -EINVAL;
1388
1389                 memcpy(&scp->conndata_out, &u.opt, optlen);
1390                 break;
1391
1392         case DSO_DISDATA:
1393                 if (sock->state != SS_CONNECTED &&
1394                     scp->accept_mode == ACC_IMMED)
1395                         return -ENOTCONN;
1396
1397                 if (optlen != sizeof(struct optdata_dn))
1398                         return -EINVAL;
1399
1400                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1401                         return -EINVAL;
1402
1403                 memcpy(&scp->discdata_out, &u.opt, optlen);
1404                 break;
1405
1406         case DSO_CONACCESS:
1407                 if (sock->state == SS_CONNECTED)
1408                         return -EISCONN;
1409                 if (scp->state != DN_O)
1410                         return -EINVAL;
1411
1412                 if (optlen != sizeof(struct accessdata_dn))
1413                         return -EINVAL;
1414
1415                 if ((u.acc.acc_accl > DN_MAXACCL) ||
1416                     (u.acc.acc_passl > DN_MAXACCL) ||
1417                     (u.acc.acc_userl > DN_MAXACCL))
1418                         return -EINVAL;
1419
1420                 memcpy(&scp->accessdata, &u.acc, optlen);
1421                 break;
1422
1423         case DSO_ACCEPTMODE:
1424                 if (sock->state == SS_CONNECTED)
1425                         return -EISCONN;
1426                 if (scp->state != DN_O)
1427                         return -EINVAL;
1428
1429                 if (optlen != sizeof(int))
1430                         return -EINVAL;
1431
1432                 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1433                         return -EINVAL;
1434
1435                 scp->accept_mode = (unsigned char)u.mode;
1436                 break;
1437
1438         case DSO_CONACCEPT:
1439                 if (scp->state != DN_CR)
1440                         return -EINVAL;
1441                 timeo = sock_rcvtimeo(sk, 0);
1442                 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1443                 return err;
1444
1445         case DSO_CONREJECT:
1446                 if (scp->state != DN_CR)
1447                         return -EINVAL;
1448
1449                 scp->state = DN_DR;
1450                 sk->sk_shutdown = SHUTDOWN_MASK;
1451                 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1452                 break;
1453
1454         case DSO_MAXWINDOW:
1455                 if (optlen != sizeof(unsigned long))
1456                         return -EINVAL;
1457                 if (u.win > NSP_MAX_WINDOW)
1458                         u.win = NSP_MAX_WINDOW;
1459                 if (u.win == 0)
1460                         return -EINVAL;
1461                 scp->max_window = u.win;
1462                 if (scp->snd_window > u.win)
1463                         scp->snd_window = u.win;
1464                 break;
1465
1466         case DSO_NODELAY:
1467                 if (optlen != sizeof(int))
1468                         return -EINVAL;
1469                 if (scp->nonagle == 2)
1470                         return -EINVAL;
1471                 scp->nonagle = (u.val == 0) ? 0 : 1;
1472                 /* if (scp->nonagle == 1) { Push pending frames } */
1473                 break;
1474
1475         case DSO_CORK:
1476                 if (optlen != sizeof(int))
1477                         return -EINVAL;
1478                 if (scp->nonagle == 1)
1479                         return -EINVAL;
1480                 scp->nonagle = (u.val == 0) ? 0 : 2;
1481                 /* if (scp->nonagle == 0) { Push pending frames } */
1482                 break;
1483
1484         case DSO_SERVICES:
1485                 if (optlen != sizeof(unsigned char))
1486                         return -EINVAL;
1487                 if ((u.services & ~NSP_FC_MASK) != 0x01)
1488                         return -EINVAL;
1489                 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1490                         return -EINVAL;
1491                 scp->services_loc = u.services;
1492                 break;
1493
1494         case DSO_INFO:
1495                 if (optlen != sizeof(unsigned char))
1496                         return -EINVAL;
1497                 if (u.info & 0xfc)
1498                         return -EINVAL;
1499                 scp->info_loc = u.info;
1500                 break;
1501
1502         case DSO_LINKINFO:
1503         case DSO_STREAM:
1504         case DSO_SEQPACKET:
1505         default:
1506                 return -ENOPROTOOPT;
1507         }
1508
1509         return 0;
1510 }
1511
1512 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1513 {
1514         struct sock *sk = sock->sk;
1515         int err;
1516
1517         lock_sock(sk);
1518         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1519         release_sock(sk);
1520 #ifdef CONFIG_NETFILTER
1521         if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
1522             optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
1523             optname != DSO_CONREJECT) {
1524                 int len;
1525
1526                 if (get_user(len, optlen))
1527                         return -EFAULT;
1528
1529                 err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1530                 if (err >= 0)
1531                         err = put_user(len, optlen);
1532         }
1533 #endif
1534
1535         return err;
1536 }
1537
1538 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1539 {
1540         struct  sock *sk = sock->sk;
1541         struct dn_scp *scp = DN_SK(sk);
1542         struct linkinfo_dn link;
1543         unsigned int r_len;
1544         void *r_data = NULL;
1545         unsigned int val;
1546
1547         if(get_user(r_len , optlen))
1548                 return -EFAULT;
1549
1550         switch (optname) {
1551         case DSO_CONDATA:
1552                 if (r_len > sizeof(struct optdata_dn))
1553                         r_len = sizeof(struct optdata_dn);
1554                 r_data = &scp->conndata_in;
1555                 break;
1556
1557         case DSO_DISDATA:
1558                 if (r_len > sizeof(struct optdata_dn))
1559                         r_len = sizeof(struct optdata_dn);
1560                 r_data = &scp->discdata_in;
1561                 break;
1562
1563         case DSO_CONACCESS:
1564                 if (r_len > sizeof(struct accessdata_dn))
1565                         r_len = sizeof(struct accessdata_dn);
1566                 r_data = &scp->accessdata;
1567                 break;
1568
1569         case DSO_ACCEPTMODE:
1570                 if (r_len > sizeof(unsigned char))
1571                         r_len = sizeof(unsigned char);
1572                 r_data = &scp->accept_mode;
1573                 break;
1574
1575         case DSO_LINKINFO:
1576                 if (r_len > sizeof(struct linkinfo_dn))
1577                         r_len = sizeof(struct linkinfo_dn);
1578
1579                 memset(&link, 0, sizeof(link));
1580
1581                 switch (sock->state) {
1582                 case SS_CONNECTING:
1583                         link.idn_linkstate = LL_CONNECTING;
1584                         break;
1585                 case SS_DISCONNECTING:
1586                         link.idn_linkstate = LL_DISCONNECTING;
1587                         break;
1588                 case SS_CONNECTED:
1589                         link.idn_linkstate = LL_RUNNING;
1590                         break;
1591                 default:
1592                         link.idn_linkstate = LL_INACTIVE;
1593                 }
1594
1595                 link.idn_segsize = scp->segsize_rem;
1596                 r_data = &link;
1597                 break;
1598
1599         case DSO_MAXWINDOW:
1600                 if (r_len > sizeof(unsigned long))
1601                         r_len = sizeof(unsigned long);
1602                 r_data = &scp->max_window;
1603                 break;
1604
1605         case DSO_NODELAY:
1606                 if (r_len > sizeof(int))
1607                         r_len = sizeof(int);
1608                 val = (scp->nonagle == 1);
1609                 r_data = &val;
1610                 break;
1611
1612         case DSO_CORK:
1613                 if (r_len > sizeof(int))
1614                         r_len = sizeof(int);
1615                 val = (scp->nonagle == 2);
1616                 r_data = &val;
1617                 break;
1618
1619         case DSO_SERVICES:
1620                 if (r_len > sizeof(unsigned char))
1621                         r_len = sizeof(unsigned char);
1622                 r_data = &scp->services_rem;
1623                 break;
1624
1625         case DSO_INFO:
1626                 if (r_len > sizeof(unsigned char))
1627                         r_len = sizeof(unsigned char);
1628                 r_data = &scp->info_rem;
1629                 break;
1630
1631         case DSO_STREAM:
1632         case DSO_SEQPACKET:
1633         case DSO_CONACCEPT:
1634         case DSO_CONREJECT:
1635         default:
1636                 return -ENOPROTOOPT;
1637         }
1638
1639         if (r_data) {
1640                 if (copy_to_user(optval, r_data, r_len))
1641                         return -EFAULT;
1642                 if (put_user(r_len, optlen))
1643                         return -EFAULT;
1644         }
1645
1646         return 0;
1647 }
1648
1649
1650 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1651 {
1652         struct sk_buff *skb;
1653         int len = 0;
1654
1655         if (flags & MSG_OOB)
1656                 return !skb_queue_empty(q) ? 1 : 0;
1657
1658         skb_queue_walk(q, skb) {
1659                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1660                 len += skb->len;
1661
1662                 if (cb->nsp_flags & 0x40) {
1663                         /* SOCK_SEQPACKET reads to EOM */
1664                         if (sk->sk_type == SOCK_SEQPACKET)
1665                                 return 1;
1666                         /* so does SOCK_STREAM unless WAITALL is specified */
1667                         if (!(flags & MSG_WAITALL))
1668                                 return 1;
1669                 }
1670
1671                 /* minimum data length for read exceeded */
1672                 if (len >= target)
1673                         return 1;
1674         }
1675
1676         return 0;
1677 }
1678
1679
1680 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1681         struct msghdr *msg, size_t size, int flags)
1682 {
1683         struct sock *sk = sock->sk;
1684         struct dn_scp *scp = DN_SK(sk);
1685         struct sk_buff_head *queue = &sk->sk_receive_queue;
1686         size_t target = size > 1 ? 1 : 0;
1687         size_t copied = 0;
1688         int rv = 0;
1689         struct sk_buff *skb, *n;
1690         struct dn_skb_cb *cb = NULL;
1691         unsigned char eor = 0;
1692         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1693
1694         lock_sock(sk);
1695
1696         if (sock_flag(sk, SOCK_ZAPPED)) {
1697                 rv = -EADDRNOTAVAIL;
1698                 goto out;
1699         }
1700
1701         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1702                 rv = 0;
1703                 goto out;
1704         }
1705
1706         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1707         if (rv)
1708                 goto out;
1709
1710         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1711                 rv = -EOPNOTSUPP;
1712                 goto out;
1713         }
1714
1715         if (flags & MSG_OOB)
1716                 queue = &scp->other_receive_queue;
1717
1718         if (flags & MSG_WAITALL)
1719                 target = size;
1720
1721
1722         /*
1723          * See if there is data ready to read, sleep if there isn't
1724          */
1725         for(;;) {
1726                 DEFINE_WAIT(wait);
1727
1728                 if (sk->sk_err)
1729                         goto out;
1730
1731                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1732                         if (!(flags & MSG_OOB)) {
1733                                 msg->msg_flags |= MSG_OOB;
1734                                 if (!scp->other_report) {
1735                                         scp->other_report = 1;
1736                                         goto out;
1737                                 }
1738                         }
1739                 }
1740
1741                 if (scp->state != DN_RUN)
1742                         goto out;
1743
1744                 if (signal_pending(current)) {
1745                         rv = sock_intr_errno(timeo);
1746                         goto out;
1747                 }
1748
1749                 if (dn_data_ready(sk, queue, flags, target))
1750                         break;
1751
1752                 if (flags & MSG_DONTWAIT) {
1753                         rv = -EWOULDBLOCK;
1754                         goto out;
1755                 }
1756
1757                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1758                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1759                 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1760                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1761                 finish_wait(sk_sleep(sk), &wait);
1762         }
1763
1764         skb_queue_walk_safe(queue, skb, n) {
1765                 unsigned int chunk = skb->len;
1766                 cb = DN_SKB_CB(skb);
1767
1768                 if ((chunk + copied) > size)
1769                         chunk = size - copied;
1770
1771                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1772                         rv = -EFAULT;
1773                         break;
1774                 }
1775                 copied += chunk;
1776
1777                 if (!(flags & MSG_PEEK))
1778                         skb_pull(skb, chunk);
1779
1780                 eor = cb->nsp_flags & 0x40;
1781
1782                 if (skb->len == 0) {
1783                         skb_unlink(skb, queue);
1784                         kfree_skb(skb);
1785                         /*
1786                          * N.B. Don't refer to skb or cb after this point
1787                          * in loop.
1788                          */
1789                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1790                                 scp->flowloc_sw = DN_SEND;
1791                                 dn_nsp_send_link(sk, DN_SEND, 0);
1792                         }
1793                 }
1794
1795                 if (eor) {
1796                         if (sk->sk_type == SOCK_SEQPACKET)
1797                                 break;
1798                         if (!(flags & MSG_WAITALL))
1799                                 break;
1800                 }
1801
1802                 if (flags & MSG_OOB)
1803                         break;
1804
1805                 if (copied >= target)
1806                         break;
1807         }
1808
1809         rv = copied;
1810
1811
1812         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1813                 msg->msg_flags |= MSG_EOR;
1814
1815 out:
1816         if (rv == 0)
1817                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1818
1819         if ((rv >= 0) && msg->msg_name) {
1820                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1821                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1822         }
1823
1824         release_sock(sk);
1825
1826         return rv;
1827 }
1828
1829
1830 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1831 {
1832         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1833         if (skb_queue_len(queue) >= scp->snd_window)
1834                 return 1;
1835         if (fctype != NSP_FC_NONE) {
1836                 if (flags & MSG_OOB) {
1837                         if (scp->flowrem_oth == 0)
1838                                 return 1;
1839                 } else {
1840                         if (scp->flowrem_dat == 0)
1841                                 return 1;
1842                 }
1843         }
1844         return 0;
1845 }
1846
1847 /*
1848  * The DECnet spec requires that the "routing layer" accepts packets which
1849  * are at least 230 bytes in size. This excludes any headers which the NSP
1850  * layer might add, so we always assume that we'll be using the maximal
1851  * length header on data packets. The variation in length is due to the
1852  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1853  * make much practical difference.
1854  */
1855 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1856 {
1857         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1858         if (dev) {
1859                 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1860                 mtu -= LL_RESERVED_SPACE(dev);
1861                 if (dn_db->use_long)
1862                         mtu -= 21;
1863                 else
1864                         mtu -= 6;
1865                 mtu -= DN_MAX_NSP_DATA_HEADER;
1866         } else {
1867                 /*
1868                  * 21 = long header, 16 = guess at MAC header length
1869                  */
1870                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1871         }
1872         if (mtu > mss)
1873                 mss = mtu;
1874         return mss;
1875 }
1876
1877 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1878 {
1879         struct dst_entry *dst = __sk_dst_get(sk);
1880         struct dn_scp *scp = DN_SK(sk);
1881         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1882
1883         /* Other data messages are limited to 16 bytes per packet */
1884         if (flags & MSG_OOB)
1885                 return 16;
1886
1887         /* This works out the maximum size of segment we can send out */
1888         if (dst) {
1889                 u32 mtu = dst_mtu(dst);
1890                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1891         }
1892
1893         return mss_now;
1894 }
1895
1896 /*
1897  * N.B. We get the timeout wrong here, but then we always did get it
1898  * wrong before and this is another step along the road to correcting
1899  * it. It ought to get updated each time we pass through the routine,
1900  * but in practise it probably doesn't matter too much for now.
1901  */
1902 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1903                               unsigned long datalen, int noblock,
1904                               int *errcode)
1905 {
1906         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1907                                                    noblock, errcode);
1908         if (skb) {
1909                 skb->protocol = htons(ETH_P_DNA_RT);
1910                 skb->pkt_type = PACKET_OUTGOING;
1911         }
1912         return skb;
1913 }
1914
1915 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1916                       struct msghdr *msg, size_t size)
1917 {
1918         struct sock *sk = sock->sk;
1919         struct dn_scp *scp = DN_SK(sk);
1920         size_t mss;
1921         struct sk_buff_head *queue = &scp->data_xmit_queue;
1922         int flags = msg->msg_flags;
1923         int err = 0;
1924         size_t sent = 0;
1925         int addr_len = msg->msg_namelen;
1926         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1927         struct sk_buff *skb = NULL;
1928         struct dn_skb_cb *cb;
1929         size_t len;
1930         unsigned char fctype;
1931         long timeo;
1932
1933         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1934                 return -EOPNOTSUPP;
1935
1936         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1937                 return -EINVAL;
1938
1939         lock_sock(sk);
1940         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1941         /*
1942          * The only difference between stream sockets and sequenced packet
1943          * sockets is that the stream sockets always behave as if MSG_EOR
1944          * has been set.
1945          */
1946         if (sock->type == SOCK_STREAM) {
1947                 if (flags & MSG_EOR) {
1948                         err = -EINVAL;
1949                         goto out;
1950                 }
1951                 flags |= MSG_EOR;
1952         }
1953
1954
1955         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1956         if (err)
1957                 goto out_err;
1958
1959         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1960                 err = -EPIPE;
1961                 if (!(flags & MSG_NOSIGNAL))
1962                         send_sig(SIGPIPE, current, 0);
1963                 goto out_err;
1964         }
1965
1966         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1967                 dst_negative_advice(sk);
1968
1969         mss = scp->segsize_rem;
1970         fctype = scp->services_rem & NSP_FC_MASK;
1971
1972         mss = dn_current_mss(sk, flags);
1973
1974         if (flags & MSG_OOB) {
1975                 queue = &scp->other_xmit_queue;
1976                 if (size > mss) {
1977                         err = -EMSGSIZE;
1978                         goto out;
1979                 }
1980         }
1981
1982         scp->persist_fxn = dn_nsp_xmit_timeout;
1983
1984         while(sent < size) {
1985                 err = sock_error(sk);
1986                 if (err)
1987                         goto out;
1988
1989                 if (signal_pending(current)) {
1990                         err = sock_intr_errno(timeo);
1991                         goto out;
1992                 }
1993
1994                 /*
1995                  * Calculate size that we wish to send.
1996                  */
1997                 len = size - sent;
1998
1999                 if (len > mss)
2000                         len = mss;
2001
2002                 /*
2003                  * Wait for queue size to go down below the window
2004                  * size.
2005                  */
2006                 if (dn_queue_too_long(scp, queue, flags)) {
2007                         DEFINE_WAIT(wait);
2008
2009                         if (flags & MSG_DONTWAIT) {
2010                                 err = -EWOULDBLOCK;
2011                                 goto out;
2012                         }
2013
2014                         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
2015                         set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2016                         sk_wait_event(sk, &timeo,
2017                                       !dn_queue_too_long(scp, queue, flags));
2018                         clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2019                         finish_wait(sk_sleep(sk), &wait);
2020                         continue;
2021                 }
2022
2023                 /*
2024                  * Get a suitably sized skb.
2025                  * 64 is a bit of a hack really, but its larger than any
2026                  * link-layer headers and has served us well as a good
2027                  * guess as to their real length.
2028                  */
2029                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2030                                          flags & MSG_DONTWAIT, &err);
2031
2032                 if (err)
2033                         break;
2034
2035                 if (!skb)
2036                         continue;
2037
2038                 cb = DN_SKB_CB(skb);
2039
2040                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2041
2042                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2043                         err = -EFAULT;
2044                         goto out;
2045                 }
2046
2047                 if (flags & MSG_OOB) {
2048                         cb->nsp_flags = 0x30;
2049                         if (fctype != NSP_FC_NONE)
2050                                 scp->flowrem_oth--;
2051                 } else {
2052                         cb->nsp_flags = 0x00;
2053                         if (scp->seg_total == 0)
2054                                 cb->nsp_flags |= 0x20;
2055
2056                         scp->seg_total += len;
2057
2058                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2059                                 cb->nsp_flags |= 0x40;
2060                                 scp->seg_total = 0;
2061                                 if (fctype == NSP_FC_SCMC)
2062                                         scp->flowrem_dat--;
2063                         }
2064                         if (fctype == NSP_FC_SRC)
2065                                 scp->flowrem_dat--;
2066                 }
2067
2068                 sent += len;
2069                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2070                 skb = NULL;
2071
2072                 scp->persist = dn_nsp_persist(sk);
2073
2074         }
2075 out:
2076
2077         kfree_skb(skb);
2078
2079         release_sock(sk);
2080
2081         return sent ? sent : err;
2082
2083 out_err:
2084         err = sk_stream_error(sk, flags, err);
2085         release_sock(sk);
2086         return err;
2087 }
2088
2089 static int dn_device_event(struct notifier_block *this, unsigned long event,
2090                         void *ptr)
2091 {
2092         struct net_device *dev = (struct net_device *)ptr;
2093
2094         if (!net_eq(dev_net(dev), &init_net))
2095                 return NOTIFY_DONE;
2096
2097         switch (event) {
2098         case NETDEV_UP:
2099                 dn_dev_up(dev);
2100                 break;
2101         case NETDEV_DOWN:
2102                 dn_dev_down(dev);
2103                 break;
2104         default:
2105                 break;
2106         }
2107
2108         return NOTIFY_DONE;
2109 }
2110
2111 static struct notifier_block dn_dev_notifier = {
2112         .notifier_call = dn_device_event,
2113 };
2114
2115 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2116
2117 static struct packet_type dn_dix_packet_type __read_mostly = {
2118         .type =         cpu_to_be16(ETH_P_DNA_RT),
2119         .func =         dn_route_rcv,
2120 };
2121
2122 #ifdef CONFIG_PROC_FS
2123 struct dn_iter_state {
2124         int bucket;
2125 };
2126
2127 static struct sock *dn_socket_get_first(struct seq_file *seq)
2128 {
2129         struct dn_iter_state *state = seq->private;
2130         struct sock *n = NULL;
2131
2132         for(state->bucket = 0;
2133             state->bucket < DN_SK_HASH_SIZE;
2134             ++state->bucket) {
2135                 n = sk_head(&dn_sk_hash[state->bucket]);
2136                 if (n)
2137                         break;
2138         }
2139
2140         return n;
2141 }
2142
2143 static struct sock *dn_socket_get_next(struct seq_file *seq,
2144                                        struct sock *n)
2145 {
2146         struct dn_iter_state *state = seq->private;
2147
2148         n = sk_next(n);
2149 try_again:
2150         if (n)
2151                 goto out;
2152         if (++state->bucket >= DN_SK_HASH_SIZE)
2153                 goto out;
2154         n = sk_head(&dn_sk_hash[state->bucket]);
2155         goto try_again;
2156 out:
2157         return n;
2158 }
2159
2160 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2161 {
2162         struct sock *sk = dn_socket_get_first(seq);
2163
2164         if (sk) {
2165                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2166                         --*pos;
2167         }
2168         return *pos ? NULL : sk;
2169 }
2170
2171 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2172 {
2173         void *rc;
2174         read_lock_bh(&dn_hash_lock);
2175         rc = socket_get_idx(seq, &pos);
2176         if (!rc) {
2177                 read_unlock_bh(&dn_hash_lock);
2178         }
2179         return rc;
2180 }
2181
2182 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2183 {
2184         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2185 }
2186
2187 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2188 {
2189         void *rc;
2190
2191         if (v == SEQ_START_TOKEN) {
2192                 rc = dn_socket_get_idx(seq, 0);
2193                 goto out;
2194         }
2195
2196         rc = dn_socket_get_next(seq, v);
2197         if (rc)
2198                 goto out;
2199         read_unlock_bh(&dn_hash_lock);
2200 out:
2201         ++*pos;
2202         return rc;
2203 }
2204
2205 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2206 {
2207         if (v && v != SEQ_START_TOKEN)
2208                 read_unlock_bh(&dn_hash_lock);
2209 }
2210
2211 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2212
2213 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2214 {
2215         int i;
2216
2217         switch (le16_to_cpu(dn->sdn_objnamel)) {
2218         case 0:
2219                 sprintf(buf, "%d", dn->sdn_objnum);
2220                 break;
2221         default:
2222                 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2223                         buf[i] = dn->sdn_objname[i];
2224                         if (IS_NOT_PRINTABLE(buf[i]))
2225                                 buf[i] = '.';
2226                 }
2227                 buf[i] = 0;
2228         }
2229 }
2230
2231 static char *dn_state2asc(unsigned char state)
2232 {
2233         switch (state) {
2234         case DN_O:
2235                 return "OPEN";
2236         case DN_CR:
2237                 return "  CR";
2238         case DN_DR:
2239                 return "  DR";
2240         case DN_DRC:
2241                 return " DRC";
2242         case DN_CC:
2243                 return "  CC";
2244         case DN_CI:
2245                 return "  CI";
2246         case DN_NR:
2247                 return "  NR";
2248         case DN_NC:
2249                 return "  NC";
2250         case DN_CD:
2251                 return "  CD";
2252         case DN_RJ:
2253                 return "  RJ";
2254         case DN_RUN:
2255                 return " RUN";
2256         case DN_DI:
2257                 return "  DI";
2258         case DN_DIC:
2259                 return " DIC";
2260         case DN_DN:
2261                 return "  DN";
2262         case DN_CL:
2263                 return "  CL";
2264         case DN_CN:
2265                 return "  CN";
2266         }
2267
2268         return "????";
2269 }
2270
2271 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2272 {
2273         struct dn_scp *scp = DN_SK(sk);
2274         char buf1[DN_ASCBUF_LEN];
2275         char buf2[DN_ASCBUF_LEN];
2276         char local_object[DN_MAXOBJL+3];
2277         char remote_object[DN_MAXOBJL+3];
2278
2279         dn_printable_object(&scp->addr, local_object);
2280         dn_printable_object(&scp->peer, remote_object);
2281
2282         seq_printf(seq,
2283                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2284                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2285                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2286                    scp->addrloc,
2287                    scp->numdat,
2288                    scp->numoth,
2289                    scp->ackxmt_dat,
2290                    scp->ackxmt_oth,
2291                    scp->flowloc_sw,
2292                    local_object,
2293                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2294                    scp->addrrem,
2295                    scp->numdat_rcv,
2296                    scp->numoth_rcv,
2297                    scp->ackrcv_dat,
2298                    scp->ackrcv_oth,
2299                    scp->flowrem_sw,
2300                    remote_object,
2301                    dn_state2asc(scp->state),
2302                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2303 }
2304
2305 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2306 {
2307         if (v == SEQ_START_TOKEN) {
2308                 seq_puts(seq, "Local                                              Remote\n");
2309         } else {
2310                 dn_socket_format_entry(seq, v);
2311         }
2312         return 0;
2313 }
2314
2315 static const struct seq_operations dn_socket_seq_ops = {
2316         .start  = dn_socket_seq_start,
2317         .next   = dn_socket_seq_next,
2318         .stop   = dn_socket_seq_stop,
2319         .show   = dn_socket_seq_show,
2320 };
2321
2322 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2323 {
2324         return seq_open_private(file, &dn_socket_seq_ops,
2325                         sizeof(struct dn_iter_state));
2326 }
2327
2328 static const struct file_operations dn_socket_seq_fops = {
2329         .owner          = THIS_MODULE,
2330         .open           = dn_socket_seq_open,
2331         .read           = seq_read,
2332         .llseek         = seq_lseek,
2333         .release        = seq_release_private,
2334 };
2335 #endif
2336
2337 static const struct net_proto_family    dn_family_ops = {
2338         .family =       AF_DECnet,
2339         .create =       dn_create,
2340         .owner  =       THIS_MODULE,
2341 };
2342
2343 static const struct proto_ops dn_proto_ops = {
2344         .family =       AF_DECnet,
2345         .owner =        THIS_MODULE,
2346         .release =      dn_release,
2347         .bind =         dn_bind,
2348         .connect =      dn_connect,
2349         .socketpair =   sock_no_socketpair,
2350         .accept =       dn_accept,
2351         .getname =      dn_getname,
2352         .poll =         dn_poll,
2353         .ioctl =        dn_ioctl,
2354         .listen =       dn_listen,
2355         .shutdown =     dn_shutdown,
2356         .setsockopt =   dn_setsockopt,
2357         .getsockopt =   dn_getsockopt,
2358         .sendmsg =      dn_sendmsg,
2359         .recvmsg =      dn_recvmsg,
2360         .mmap =         sock_no_mmap,
2361         .sendpage =     sock_no_sendpage,
2362 };
2363
2364 void dn_register_sysctl_skeleton(void);
2365 void dn_unregister_sysctl_skeleton(void);
2366 void dn_register_sysctl(void);
2367 void dn_unregister_sysctl(void);
2368
2369 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2370 MODULE_AUTHOR("Linux DECnet Project Team");
2371 MODULE_LICENSE("GPL");
2372 MODULE_ALIAS_NETPROTO(PF_DECnet);
2373
2374 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2375
2376 static int __init decnet_init(void)
2377 {
2378         int rc;
2379
2380         printk(banner);
2381
2382         rc = proto_register(&dn_proto, 1);
2383         if (rc != 0)
2384                 goto out;
2385
2386         dn_register_sysctl_skeleton();
2387         dn_neigh_init();
2388         dn_dev_init();
2389         dn_route_init();
2390         dn_fib_init();
2391
2392         sock_register(&dn_family_ops);
2393         dev_add_pack(&dn_dix_packet_type);
2394         register_netdevice_notifier(&dn_dev_notifier);
2395
2396         proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
2397         dn_register_sysctl();
2398 out:
2399         return rc;
2400
2401 }
2402 module_init(decnet_init);
2403
2404 /*
2405  * Prevent DECnet module unloading until its fixed properly.
2406  * Requires an audit of the code to check for memory leaks and
2407  * initialisation problems etc.
2408  */
2409 #if 0
2410 static void __exit decnet_exit(void)
2411 {
2412         sock_unregister(AF_DECnet);
2413         rtnl_unregister_all(PF_DECnet);
2414         dev_remove_pack(&dn_dix_packet_type);
2415
2416         dn_unregister_sysctl();
2417
2418         unregister_netdevice_notifier(&dn_dev_notifier);
2419
2420         dn_route_cleanup();
2421         dn_dev_cleanup();
2422         dn_neigh_cleanup();
2423         dn_fib_cleanup();
2424
2425         proc_net_remove(&init_net, "decnet");
2426         dn_unregister_sysctl_skeleton();
2427
2428         proto_unregister(&dn_proto);
2429
2430         rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
2431 }
2432 module_exit(decnet_exit);
2433 #endif