net/decnet/af_decnet.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /*
   4  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   5  *              operating system.  DECnet is implemented using the  BSD Socket
   6  *              interface as the means of communication with the user level.
   7  *
   8  *              DECnet Socket Layer Interface
   9  *
  10  * Authors:     Eduardo Marcelo Serrat <emserrat@geocities.com>
  11  *              Patrick Caulfield <patrick@pandh.demon.co.uk>
  12  *
  13  * Changes:
  14  *        Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
  15  *                          version of the code. Original copyright preserved
  16  *                          below.
  17  *        Steve Whitehouse: Some bug fixes, cleaning up some code to make it
  18  *                          compatible with my routing layer.
  19  *        Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
  20  *                          Caulfield.
  21  *        Steve Whitehouse: Further bug fixes, checking module code still works
  22  *                          with new routing layer.
  23  *        Steve Whitehouse: Additional set/get_sockopt() calls.
  24  *        Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
  25  *                          code.
  26  *        Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
  27  *                          way. Didn't manage it entirely, but its better.
  28  *        Steve Whitehouse: ditto for sendmsg().
  29  *        Steve Whitehouse: A selection of bug fixes to various things.
  30  *        Steve Whitehouse: Added TIOCOUTQ ioctl.
  31  *        Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
  32  *        Steve Whitehouse: Fixes to connect() error returns.
  33  *       Patrick Caulfield: Fixes to delayed acceptance logic.
  34  *         David S. Miller: New socket locking
  35  *        Steve Whitehouse: Socket list hashing/locking
  36  *         Arnaldo C. Melo: use capable, not suser
  37  *        Steve Whitehouse: Removed unused code. Fix to use sk->allocation
  38  *                          when required.
  39  *       Patrick Caulfield: /proc/net/decnet now has object name/number
  40  *        Steve Whitehouse: Fixed local port allocation, hashed sk list
  41  *          Matthew Wilcox: Fixes for dn_ioctl()
  42  *        Steve Whitehouse: New connect/accept logic to allow timeouts and
  43  *                          prepare for sendpage etc.
  44  */
  45
  46
  47 /******************************************************************************
  48     (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
  49
  50
  51 HISTORY:
  52
  53 Version           Kernel     Date       Author/Comments
  54 -------           ------     ----       ---------------
  55 Version 0.0.1     2.0.30    01-dic-97   Eduardo Marcelo Serrat
  56                                         (emserrat@geocities.com)
  57
  58                                         First Development of DECnet Socket La-
  59                                         yer for Linux. Only supports outgoing
  60                                         connections.
  61
  62 Version 0.0.2     2.1.105   20-jun-98   Patrick J. Caulfield
  63                                         (patrick@pandh.demon.co.uk)
  64
  65                                         Port to new kernel development version.
  66
  67 Version 0.0.3     2.1.106   25-jun-98   Eduardo Marcelo Serrat
  68                                         (emserrat@geocities.com)
  69                                         _
  70                                         Added support for incoming connections
  71                                         so we can start developing server apps
  72                                         on Linux.
  73                                         -
  74                                         Module Support
  75 Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
  76                                        (emserrat@geocities.com)
  77                                        _
  78                                         Added support for X11R6.4. Now we can
  79                                         use DECnet transport for X on Linux!!!
  80                                        -
  81 Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
  82                                        (emserrat@geocities.com)
  83                                        Removed bugs on flow control
  84                                        Removed bugs on incoming accessdata
  85                                        order
  86                                        -
  87 Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
  88                                        dn_recvmsg fixes
  89
  90                                         Patrick J. Caulfield
  91                                        dn_bind fixes
  92 *******************************************************************************/
  93
  94 #include <linux/module.h>
  95 #include <linux/errno.h>
  96 #include <linux/types.h>
  97 #include <linux/slab.h>
  98 #include <linux/socket.h>
  99 #include <linux/in.h>
 100 #include <linux/kernel.h>
 101 #include <linux/sched/signal.h>
 102 #include <linux/timer.h>
 103 #include <linux/string.h>
 104 #include <linux/sockios.h>
 105 #include <linux/net.h>
 106 #include <linux/netdevice.h>
 107 #include <linux/inet.h>
 108 #include <linux/route.h>
 109 #include <linux/netfilter.h>
 110 #include <linux/seq_file.h>
 111 #include <net/sock.h>
 112 #include <net/tcp_states.h>
 113 #include <net/flow.h>
 114 #include <asm/ioctls.h>
 115 #include <linux/capability.h>
 116 #include <linux/mm.h>
 117 #include <linux/interrupt.h>
 118 #include <linux/proc_fs.h>
 119 #include <linux/stat.h>
 120 #include <linux/init.h>
 121 #include <linux/poll.h>
 122 #include <linux/jiffies.h>
 123 #include <net/net_namespace.h>
 124 #include <net/neighbour.h>
 125 #include <net/dst.h>
 126 #include <net/fib_rules.h>
 127 #include <net/tcp.h>
 128 #include <net/dn.h>
 129 #include <net/dn_nsp.h>
 130 #include <net/dn_dev.h>
 131 #include <net/dn_route.h>
 132 #include <net/dn_fib.h>
 133 #include <net/dn_neigh.h>
 134
 135 struct dn_sock {
 136         struct sock sk;
 137         struct dn_scp scp;
 138 };
 139
 140 static void dn_keepalive(struct sock *sk);
 141
 142 #define DN_SK_HASH_SHIFT 8
 143 #define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
 144 #define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
 145
 146
 147 static const struct proto_ops dn_proto_ops;
 148 static DEFINE_RWLOCK(dn_hash_lock);
 149 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 150 static struct hlist_head dn_wild_sk;
 151 static atomic_long_t decnet_memory_allocated;
 152
 153 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen, int flags);
 154 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 155
 156 static struct hlist_head *dn_find_list(struct sock *sk)
 157 {
 158         struct dn_scp *scp = DN_SK(sk);
 159
 160         if (scp->addr.sdn_flags & SDF_WILD)
 161                 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
 162
 163         return &dn_sk_hash[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
 164 }
 165
 166 /*
 167  * Valid ports are those greater than zero and not already in use.
 168  */
 169 static int check_port(__le16 port)
 170 {
 171         struct sock *sk;
 172
 173         if (port == 0)
 174                 return -1;
 175
 176         sk_for_each(sk, &dn_sk_hash[le16_to_cpu(port) & DN_SK_HASH_MASK]) {
 177                 struct dn_scp *scp = DN_SK(sk);
 178                 if (scp->addrloc == port)
 179                         return -1;
 180         }
 181         return 0;
 182 }
 183
 184 static unsigned short port_alloc(struct sock *sk)
 185 {
 186         struct dn_scp *scp = DN_SK(sk);
 187         static unsigned short port = 0x2000;
 188         unsigned short i_port = port;
 189
 190         while(check_port(cpu_to_le16(++port)) != 0) {
 191                 if (port == i_port)
 192                         return 0;
 193         }
 194
 195         scp->addrloc = cpu_to_le16(port);
 196
 197         return 1;
 198 }
 199
 200 /*
 201  * Since this is only ever called from user
 202  * level, we don't need a write_lock() version
 203  * of this.
 204  */
 205 static int dn_hash_sock(struct sock *sk)
 206 {
 207         struct dn_scp *scp = DN_SK(sk);
 208         struct hlist_head *list;
 209         int rv = -EUSERS;
 210
 211         BUG_ON(sk_hashed(sk));
 212
 213         write_lock_bh(&dn_hash_lock);
 214
 215         if (!scp->addrloc && !port_alloc(sk))
 216                 goto out;
 217
 218         rv = -EADDRINUSE;
 219         if ((list = dn_find_list(sk)) == NULL)
 220                 goto out;
 221
 222         sk_add_node(sk, list);
 223         rv = 0;
 224 out:
 225         write_unlock_bh(&dn_hash_lock);
 226         return rv;
 227 }
 228
 229 static void dn_unhash_sock(struct sock *sk)
 230 {
 231         write_lock(&dn_hash_lock);
 232         sk_del_node_init(sk);
 233         write_unlock(&dn_hash_lock);
 234 }
 235
 236 static void dn_unhash_sock_bh(struct sock *sk)
 237 {
 238         write_lock_bh(&dn_hash_lock);
 239         sk_del_node_init(sk);
 240         write_unlock_bh(&dn_hash_lock);
 241 }
 242
 243 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
 244 {
 245         int i;
 246         unsigned int hash = addr->sdn_objnum;
 247
 248         if (hash == 0) {
 249                 hash = addr->sdn_objnamel;
 250                 for(i = 0; i < le16_to_cpu(addr->sdn_objnamel); i++) {
 251                         hash ^= addr->sdn_objname[i];
 252                         hash ^= (hash << 3);
 253                 }
 254         }
 255
 256         return &dn_sk_hash[hash & DN_SK_HASH_MASK];
 257 }
 258
 259 /*
 260  * Called to transform a socket from bound (i.e. with a local address)
 261  * into a listening socket (doesn't need a local port number) and rehashes
 262  * based upon the object name/number.
 263  */
 264 static void dn_rehash_sock(struct sock *sk)
 265 {
 266         struct hlist_head *list;
 267         struct dn_scp *scp = DN_SK(sk);
 268
 269         if (scp->addr.sdn_flags & SDF_WILD)
 270                 return;
 271
 272         write_lock_bh(&dn_hash_lock);
 273         sk_del_node_init(sk);
 274         DN_SK(sk)->addrloc = 0;
 275         list = listen_hash(&DN_SK(sk)->addr);
 276         sk_add_node(sk, list);
 277         write_unlock_bh(&dn_hash_lock);
 278 }
 279
 280 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
 281 {
 282         int len = 2;
 283
 284         *buf++ = type;
 285
 286         switch (type) {
 287         case 0:
 288                 *buf++ = sdn->sdn_objnum;
 289                 break;
 290         case 1:
 291                 *buf++ = 0;
 292                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
 293                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 294                 len = 3 + le16_to_cpu(sdn->sdn_objnamel);
 295                 break;
 296         case 2:
 297                 memset(buf, 0, 5);
 298                 buf += 5;
 299                 *buf++ = le16_to_cpu(sdn->sdn_objnamel);
 300                 memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
 301                 len = 7 + le16_to_cpu(sdn->sdn_objnamel);
 302                 break;
 303         }
 304
 305         return len;
 306 }
 307
 308 /*
 309  * On reception of usernames, we handle types 1 and 0 for destination
 310  * addresses only. Types 2 and 4 are used for source addresses, but the
 311  * UIC, GIC are ignored and they are both treated the same way. Type 3
 312  * is never used as I've no idea what its purpose might be or what its
 313  * format is.
 314  */
 315 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
 316 {
 317         unsigned char type;
 318         int size = len;
 319         int namel = 12;
 320
 321         sdn->sdn_objnum = 0;
 322         sdn->sdn_objnamel = cpu_to_le16(0);
 323         memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 324
 325         if (len < 2)
 326                 return -1;
 327
 328         len -= 2;
 329         *fmt = *data++;
 330         type = *data++;
 331
 332         switch (*fmt) {
 333         case 0:
 334                 sdn->sdn_objnum = type;
 335                 return 2;
 336         case 1:
 337                 namel = 16;
 338                 break;
 339         case 2:
 340                 len  -= 4;
 341                 data += 4;
 342                 break;
 343         case 4:
 344                 len  -= 8;
 345                 data += 8;
 346                 break;
 347         default:
 348                 return -1;
 349         }
 350
 351         len -= 1;
 352
 353         if (len < 0)
 354                 return -1;
 355
 356         sdn->sdn_objnamel = cpu_to_le16(*data++);
 357         len -= le16_to_cpu(sdn->sdn_objnamel);
 358
 359         if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
 360                 return -1;
 361
 362         memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
 363
 364         return size - len;
 365 }
 366
 367 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
 368 {
 369         struct hlist_head *list = listen_hash(addr);
 370         struct sock *sk;
 371
 372         read_lock(&dn_hash_lock);
 373         sk_for_each(sk, list) {
 374                 struct dn_scp *scp = DN_SK(sk);
 375                 if (sk->sk_state != TCP_LISTEN)
 376                         continue;
 377                 if (scp->addr.sdn_objnum) {
 378                         if (scp->addr.sdn_objnum != addr->sdn_objnum)
 379                                 continue;
 380                 } else {
 381                         if (addr->sdn_objnum)
 382                                 continue;
 383                         if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 384                                 continue;
 385                         if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, le16_to_cpu(addr->sdn_objnamel)) != 0)
 386                                 continue;
 387                 }
 388                 sock_hold(sk);
 389                 read_unlock(&dn_hash_lock);
 390                 return sk;
 391         }
 392
 393         sk = sk_head(&dn_wild_sk);
 394         if (sk) {
 395                 if (sk->sk_state == TCP_LISTEN)
 396                         sock_hold(sk);
 397                 else
 398                         sk = NULL;
 399         }
 400
 401         read_unlock(&dn_hash_lock);
 402         return sk;
 403 }
 404
 405 struct sock *dn_find_by_skb(struct sk_buff *skb)
 406 {
 407         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 408         struct sock *sk;
 409         struct dn_scp *scp;
 410
 411         read_lock(&dn_hash_lock);
 412         sk_for_each(sk, &dn_sk_hash[le16_to_cpu(cb->dst_port) & DN_SK_HASH_MASK]) {
 413                 scp = DN_SK(sk);
 414                 if (cb->src != dn_saddr2dn(&scp->peer))
 415                         continue;
 416                 if (cb->dst_port != scp->addrloc)
 417                         continue;
 418                 if (scp->addrrem && (cb->src_port != scp->addrrem))
 419                         continue;
 420                 sock_hold(sk);
 421                 goto found;
 422         }
 423         sk = NULL;
 424 found:
 425         read_unlock(&dn_hash_lock);
 426         return sk;
 427 }
 428
 429
 430
 431 static void dn_destruct(struct sock *sk)
 432 {
 433         struct dn_scp *scp = DN_SK(sk);
 434
 435         skb_queue_purge(&scp->data_xmit_queue);
 436         skb_queue_purge(&scp->other_xmit_queue);
 437         skb_queue_purge(&scp->other_receive_queue);
 438
 439         dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
 440 }
 441
 442 static unsigned long dn_memory_pressure;
 443
 444 static void dn_enter_memory_pressure(struct sock *sk)
 445 {
 446         if (!dn_memory_pressure) {
 447                 dn_memory_pressure = 1;
 448         }
 449 }
 450
 451 static struct proto dn_proto = {
 452         .name                   = "NSP",
 453         .owner                  = THIS_MODULE,
 454         .enter_memory_pressure  = dn_enter_memory_pressure,
 455         .memory_pressure        = &dn_memory_pressure,
 456         .memory_allocated       = &decnet_memory_allocated,
 457         .sysctl_mem             = sysctl_decnet_mem,
 458         .sysctl_wmem            = sysctl_decnet_wmem,
 459         .sysctl_rmem            = sysctl_decnet_rmem,
 460         .max_header             = DN_MAX_NSP_DATA_HEADER + 64,
 461         .obj_size               = sizeof(struct dn_sock),
 462 };
 463
 464 static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
 465 {
 466         struct dn_scp *scp;
 467         struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
 468
 469         if  (!sk)
 470                 goto out;
 471
 472         if (sock)
 473                 sock->ops = &dn_proto_ops;
 474         sock_init_data(sock, sk);
 475
 476         sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 477         sk->sk_destruct    = dn_destruct;
 478         sk->sk_no_check_tx = 1;
 479         sk->sk_family      = PF_DECnet;
 480         sk->sk_protocol    = 0;
 481         sk->sk_allocation  = gfp;
 482         sk->sk_sndbuf      = sysctl_decnet_wmem[1];
 483         sk->sk_rcvbuf      = sysctl_decnet_rmem[1];
 484
 485         /* Initialization of DECnet Session Control Port                */
 486         scp = DN_SK(sk);
 487         scp->state      = DN_O;         /* Open                 */
 488         scp->numdat     = 1;            /* Next data seg to tx  */
 489         scp->numoth     = 1;            /* Next oth data to tx  */
 490         scp->ackxmt_dat = 0;            /* Last data seg ack'ed */
 491         scp->ackxmt_oth = 0;            /* Last oth data ack'ed */
 492         scp->ackrcv_dat = 0;            /* Highest data ack recv*/
 493         scp->ackrcv_oth = 0;            /* Last oth data ack rec*/
 494         scp->flowrem_sw = DN_SEND;
 495         scp->flowloc_sw = DN_SEND;
 496         scp->flowrem_dat = 0;
 497         scp->flowrem_oth = 1;
 498         scp->flowloc_dat = 0;
 499         scp->flowloc_oth = 1;
 500         scp->services_rem = 0;
 501         scp->services_loc = 1 | NSP_FC_NONE;
 502         scp->info_rem = 0;
 503         scp->info_loc = 0x03; /* NSP version 4.1 */
 504         scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 505         scp->nonagle = 0;
 506         scp->multi_ireq = 1;
 507         scp->accept_mode = ACC_IMMED;
 508         scp->addr.sdn_family    = AF_DECnet;
 509         scp->peer.sdn_family    = AF_DECnet;
 510         scp->accessdata.acc_accl = 5;
 511         memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 512
 513         scp->max_window   = NSP_MAX_WINDOW;
 514         scp->snd_window   = NSP_MIN_WINDOW;
 515         scp->nsp_srtt     = NSP_INITIAL_SRTT;
 516         scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 517         scp->nsp_rxtshift = 0;
 518
 519         skb_queue_head_init(&scp->data_xmit_queue);
 520         skb_queue_head_init(&scp->other_xmit_queue);
 521         skb_queue_head_init(&scp->other_receive_queue);
 522
 523         scp->persist = 0;
 524         scp->persist_fxn = NULL;
 525         scp->keepalive = 10 * HZ;
 526         scp->keepalive_fxn = dn_keepalive;
 527
 528         dn_start_slow_timer(sk);
 529 out:
 530         return sk;
 531 }
 532
 533 /*
 534  * Keepalive timer.
 535  * FIXME: Should respond to SO_KEEPALIVE etc.
 536  */
 537 static void dn_keepalive(struct sock *sk)
 538 {
 539         struct dn_scp *scp = DN_SK(sk);
 540
 541         /*
 542          * By checking the other_data transmit queue is empty
 543          * we are double checking that we are not sending too
 544          * many of these keepalive frames.
 545          */
 546         if (skb_queue_empty(&scp->other_xmit_queue))
 547                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 548 }
 549
 550
 551 /*
 552  * Timer for shutdown/destroyed sockets.
 553  * When socket is dead & no packets have been sent for a
 554  * certain amount of time, they are removed by this
 555  * routine. Also takes care of sending out DI & DC
 556  * frames at correct times.
 557  */
 558 int dn_destroy_timer(struct sock *sk)
 559 {
 560         struct dn_scp *scp = DN_SK(sk);
 561
 562         scp->persist = dn_nsp_persist(sk);
 563
 564         switch (scp->state) {
 565         case DN_DI:
 566                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 567                 if (scp->nsp_rxtshift >= decnet_di_count)
 568                         scp->state = DN_CN;
 569                 return 0;
 570
 571         case DN_DR:
 572                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 573                 if (scp->nsp_rxtshift >= decnet_dr_count)
 574                         scp->state = DN_DRC;
 575                 return 0;
 576
 577         case DN_DN:
 578                 if (scp->nsp_rxtshift < decnet_dn_count) {
 579                         /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 580                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 581                                          GFP_ATOMIC);
 582                         return 0;
 583                 }
 584         }
 585
 586         scp->persist = (HZ * decnet_time_wait);
 587
 588         if (sk->sk_socket)
 589                 return 0;
 590
 591         if (time_after_eq(jiffies, scp->stamp + HZ * decnet_time_wait)) {
 592                 dn_unhash_sock(sk);
 593                 sock_put(sk);
 594                 return 1;
 595         }
 596
 597         return 0;
 598 }
 599
 600 static void dn_destroy_sock(struct sock *sk)
 601 {
 602         struct dn_scp *scp = DN_SK(sk);
 603
 604         scp->nsp_rxtshift = 0; /* reset back off */
 605
 606         if (sk->sk_socket) {
 607                 if (sk->sk_socket->state != SS_UNCONNECTED)
 608                         sk->sk_socket->state = SS_DISCONNECTING;
 609         }
 610
 611         sk->sk_state = TCP_CLOSE;
 612
 613         switch (scp->state) {
 614         case DN_DN:
 615                 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 616                                  sk->sk_allocation);
 617                 scp->persist_fxn = dn_destroy_timer;
 618                 scp->persist = dn_nsp_persist(sk);
 619                 break;
 620         case DN_CR:
 621                 scp->state = DN_DR;
 622                 goto disc_reject;
 623         case DN_RUN:
 624                 scp->state = DN_DI;
 625                 /* fall through */
 626         case DN_DI:
 627         case DN_DR:
 628 disc_reject:
 629                 dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 630                 /* fall through */
 631         case DN_NC:
 632         case DN_NR:
 633         case DN_RJ:
 634         case DN_DIC:
 635         case DN_CN:
 636         case DN_DRC:
 637         case DN_CI:
 638         case DN_CD:
 639                 scp->persist_fxn = dn_destroy_timer;
 640                 scp->persist = dn_nsp_persist(sk);
 641                 break;
 642         default:
 643                 printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 644                 /* fall through */
 645         case DN_O:
 646                 dn_stop_slow_timer(sk);
 647
 648                 dn_unhash_sock_bh(sk);
 649                 sock_put(sk);
 650
 651                 break;
 652         }
 653 }
 654
 655 char *dn_addr2asc(__u16 addr, char *buf)
 656 {
 657         unsigned short node, area;
 658
 659         node = addr & 0x03ff;
 660         area = addr >> 10;
 661         sprintf(buf, "%hd.%hd", area, node);
 662
 663         return buf;
 664 }
 665
 666
 667
 668 static int dn_create(struct net *net, struct socket *sock, int protocol,
 669                      int kern)
 670 {
 671         struct sock *sk;
 672
 673         if (protocol < 0 || protocol > U8_MAX)
 674                 return -EINVAL;
 675
 676         if (!net_eq(net, &init_net))
 677                 return -EAFNOSUPPORT;
 678
 679         switch (sock->type) {
 680         case SOCK_SEQPACKET:
 681                 if (protocol != DNPROTO_NSP)
 682                         return -EPROTONOSUPPORT;
 683                 break;
 684         case SOCK_STREAM:
 685                 break;
 686         default:
 687                 return -ESOCKTNOSUPPORT;
 688         }
 689
 690
 691         if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL, kern)) == NULL)
 692                 return -ENOBUFS;
 693
 694         sk->sk_protocol = protocol;
 695
 696         return 0;
 697 }
 698
 699
 700 static int
 701 dn_release(struct socket *sock)
 702 {
 703         struct sock *sk = sock->sk;
 704
 705         if (sk) {
 706                 sock_orphan(sk);
 707                 sock_hold(sk);
 708                 lock_sock(sk);
 709                 dn_destroy_sock(sk);
 710                 release_sock(sk);
 711                 sock_put(sk);
 712         }
 713
 714         return 0;
 715 }
 716
 717 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 718 {
 719         struct sock *sk = sock->sk;
 720         struct dn_scp *scp = DN_SK(sk);
 721         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 722         struct net_device *dev, *ldev;
 723         int rv;
 724
 725         if (addr_len != sizeof(struct sockaddr_dn))
 726                 return -EINVAL;
 727
 728         if (saddr->sdn_family != AF_DECnet)
 729                 return -EINVAL;
 730
 731         if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
 732                 return -EINVAL;
 733
 734         if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
 735                 return -EINVAL;
 736
 737         if (saddr->sdn_flags & ~SDF_WILD)
 738                 return -EINVAL;
 739
 740         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 741             (saddr->sdn_flags & SDF_WILD)))
 742                 return -EACCES;
 743
 744         if (!(saddr->sdn_flags & SDF_WILD)) {
 745                 if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
 746                         rcu_read_lock();
 747                         ldev = NULL;
 748                         for_each_netdev_rcu(&init_net, dev) {
 749                                 if (!dev->dn_ptr)
 750                                         continue;
 751                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 752                                         ldev = dev;
 753                                         break;
 754                                 }
 755                         }
 756                         rcu_read_unlock();
 757                         if (ldev == NULL)
 758                                 return -EADDRNOTAVAIL;
 759                 }
 760         }
 761
 762         rv = -EINVAL;
 763         lock_sock(sk);
 764         if (sock_flag(sk, SOCK_ZAPPED)) {
 765                 memcpy(&scp->addr, saddr, addr_len);
 766                 sock_reset_flag(sk, SOCK_ZAPPED);
 767
 768                 rv = dn_hash_sock(sk);
 769                 if (rv)
 770                         sock_set_flag(sk, SOCK_ZAPPED);
 771         }
 772         release_sock(sk);
 773
 774         return rv;
 775 }
 776
 777
 778 static int dn_auto_bind(struct socket *sock)
 779 {
 780         struct sock *sk = sock->sk;
 781         struct dn_scp *scp = DN_SK(sk);
 782         int rv;
 783
 784         sock_reset_flag(sk, SOCK_ZAPPED);
 785
 786         scp->addr.sdn_flags  = 0;
 787         scp->addr.sdn_objnum = 0;
 788
 789         /*
 790          * This stuff is to keep compatibility with Eduardo's
 791          * patch. I hope I can dispense with it shortly...
 792          */
 793         if ((scp->accessdata.acc_accl != 0) &&
 794                 (scp->accessdata.acc_accl <= 12)) {
 795
 796                 scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
 797                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
 798
 799                 scp->accessdata.acc_accl = 0;
 800                 memset(scp->accessdata.acc_acc, 0, 40);
 801         }
 802         /* End of compatibility stuff */
 803
 804         scp->addr.sdn_add.a_len = cpu_to_le16(2);
 805         rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 806         if (rv == 0) {
 807                 rv = dn_hash_sock(sk);
 808                 if (rv)
 809                         sock_set_flag(sk, SOCK_ZAPPED);
 810         }
 811
 812         return rv;
 813 }
 814
 815 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 816 {
 817         struct dn_scp *scp = DN_SK(sk);
 818         DEFINE_WAIT(wait);
 819         int err;
 820
 821         if (scp->state != DN_CR)
 822                 return -EINVAL;
 823
 824         scp->state = DN_CC;
 825         scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
 826         dn_send_conn_conf(sk, allocation);
 827
 828         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 829         for(;;) {
 830                 release_sock(sk);
 831                 if (scp->state == DN_CC)
 832                         *timeo = schedule_timeout(*timeo);
 833                 lock_sock(sk);
 834                 err = 0;
 835                 if (scp->state == DN_RUN)
 836                         break;
 837                 err = sock_error(sk);
 838                 if (err)
 839                         break;
 840                 err = sock_intr_errno(*timeo);
 841                 if (signal_pending(current))
 842                         break;
 843                 err = -EAGAIN;
 844                 if (!*timeo)
 845                         break;
 846                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 847         }
 848         finish_wait(sk_sleep(sk), &wait);
 849         if (err == 0) {
 850                 sk->sk_socket->state = SS_CONNECTED;
 851         } else if (scp->state != DN_CC) {
 852                 sk->sk_socket->state = SS_UNCONNECTED;
 853         }
 854         return err;
 855 }
 856
 857 static int dn_wait_run(struct sock *sk, long *timeo)
 858 {
 859         struct dn_scp *scp = DN_SK(sk);
 860         DEFINE_WAIT(wait);
 861         int err = 0;
 862
 863         if (scp->state == DN_RUN)
 864                 goto out;
 865
 866         if (!*timeo)
 867                 return -EALREADY;
 868
 869         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 870         for(;;) {
 871                 release_sock(sk);
 872                 if (scp->state == DN_CI || scp->state == DN_CC)
 873                         *timeo = schedule_timeout(*timeo);
 874                 lock_sock(sk);
 875                 err = 0;
 876                 if (scp->state == DN_RUN)
 877                         break;
 878                 err = sock_error(sk);
 879                 if (err)
 880                         break;
 881                 err = sock_intr_errno(*timeo);
 882                 if (signal_pending(current))
 883                         break;
 884                 err = -ETIMEDOUT;
 885                 if (!*timeo)
 886                         break;
 887                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 888         }
 889         finish_wait(sk_sleep(sk), &wait);
 890 out:
 891         if (err == 0) {
 892                 sk->sk_socket->state = SS_CONNECTED;
 893         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 894                 sk->sk_socket->state = SS_UNCONNECTED;
 895         }
 896         return err;
 897 }
 898
 899 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 900 {
 901         struct socket *sock = sk->sk_socket;
 902         struct dn_scp *scp = DN_SK(sk);
 903         int err = -EISCONN;
 904         struct flowidn fld;
 905         struct dst_entry *dst;
 906
 907         if (sock->state == SS_CONNECTED)
 908                 goto out;
 909
 910         if (sock->state == SS_CONNECTING) {
 911                 err = 0;
 912                 if (scp->state == DN_RUN) {
 913                         sock->state = SS_CONNECTED;
 914                         goto out;
 915                 }
 916                 err = -ECONNREFUSED;
 917                 if (scp->state != DN_CI && scp->state != DN_CC) {
 918                         sock->state = SS_UNCONNECTED;
 919                         goto out;
 920                 }
 921                 return dn_wait_run(sk, timeo);
 922         }
 923
 924         err = -EINVAL;
 925         if (scp->state != DN_O)
 926                 goto out;
 927
 928         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 929                 goto out;
 930         if (addr->sdn_family != AF_DECnet)
 931                 goto out;
 932         if (addr->sdn_flags & SDF_WILD)
 933                 goto out;
 934
 935         if (sock_flag(sk, SOCK_ZAPPED)) {
 936                 err = dn_auto_bind(sk->sk_socket);
 937                 if (err)
 938                         goto out;
 939         }
 940
 941         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 942
 943         err = -EHOSTUNREACH;
 944         memset(&fld, 0, sizeof(fld));
 945         fld.flowidn_oif = sk->sk_bound_dev_if;
 946         fld.daddr = dn_saddr2dn(&scp->peer);
 947         fld.saddr = dn_saddr2dn(&scp->addr);
 948         dn_sk_ports_copy(&fld, scp);
 949         fld.flowidn_proto = DNPROTO_NSP;
 950         if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
 951                 goto out;
 952         dst = __sk_dst_get(sk);
 953         sk->sk_route_caps = dst->dev->features;
 954         sock->state = SS_CONNECTING;
 955         scp->state = DN_CI;
 956         scp->segsize_loc = dst_metric_advmss(dst);
 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   = cpu_to_le16(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_sleep(sk), &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_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1059         }
1060         finish_wait(sk_sleep(sk), &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                      bool kern)
1067 {
1068         struct sock *sk = sock->sk, *newsk;
1069         struct sk_buff *skb = NULL;
1070         struct dn_skb_cb *cb;
1071         unsigned char menuver;
1072         int err = 0;
1073         unsigned char type;
1074         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1075         struct dst_entry *dst;
1076
1077         lock_sock(sk);
1078
1079         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1080                 release_sock(sk);
1081                 return -EINVAL;
1082         }
1083
1084         skb = skb_dequeue(&sk->sk_receive_queue);
1085         if (skb == NULL) {
1086                 skb = dn_wait_for_connect(sk, &timeo);
1087                 if (IS_ERR(skb)) {
1088                         release_sock(sk);
1089                         return PTR_ERR(skb);
1090                 }
1091         }
1092
1093         cb = DN_SKB_CB(skb);
1094         sk_acceptq_removed(sk);
1095         newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation, kern);
1096         if (newsk == NULL) {
1097                 release_sock(sk);
1098                 kfree_skb(skb);
1099                 return -ENOBUFS;
1100         }
1101         release_sock(sk);
1102
1103         dst = skb_dst(skb);
1104         sk_dst_set(newsk, dst);
1105         skb_dst_set(skb, NULL);
1106
1107         DN_SK(newsk)->state        = DN_CR;
1108         DN_SK(newsk)->addrrem      = cb->src_port;
1109         DN_SK(newsk)->services_rem = cb->services;
1110         DN_SK(newsk)->info_rem     = cb->info;
1111         DN_SK(newsk)->segsize_rem  = cb->segsize;
1112         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1113
1114         if (DN_SK(newsk)->segsize_rem < 230)
1115                 DN_SK(newsk)->segsize_rem = 230;
1116
1117         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1118                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1119
1120         newsk->sk_state  = TCP_LISTEN;
1121         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1122
1123         /*
1124          * If we are listening on a wild socket, we don't want
1125          * the newly created socket on the wrong hash queue.
1126          */
1127         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1128
1129         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1130         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1131         *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1132         *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1133
1134         menuver = *skb->data;
1135         skb_pull(skb, 1);
1136
1137         if (menuver & DN_MENUVER_ACC)
1138                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1139
1140         if (menuver & DN_MENUVER_USR)
1141                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1142
1143         if (menuver & DN_MENUVER_PRX)
1144                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1145
1146         if (menuver & DN_MENUVER_UIC)
1147                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1148
1149         kfree_skb(skb);
1150
1151         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1152                 sizeof(struct optdata_dn));
1153         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1154                 sizeof(struct optdata_dn));
1155
1156         lock_sock(newsk);
1157         err = dn_hash_sock(newsk);
1158         if (err == 0) {
1159                 sock_reset_flag(newsk, SOCK_ZAPPED);
1160                 dn_send_conn_ack(newsk);
1161
1162                 /*
1163                  * Here we use sk->sk_allocation since although the conn conf is
1164                  * for the newsk, the context is the old socket.
1165                  */
1166                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1167                         err = dn_confirm_accept(newsk, &timeo,
1168                                                 sk->sk_allocation);
1169         }
1170         release_sock(newsk);
1171         return err;
1172 }
1173
1174
1175 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int peer)
1176 {
1177         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1178         struct sock *sk = sock->sk;
1179         struct dn_scp *scp = DN_SK(sk);
1180
1181         lock_sock(sk);
1182
1183         if (peer) {
1184                 if ((sock->state != SS_CONNECTED &&
1185                      sock->state != SS_CONNECTING) &&
1186                     scp->accept_mode == ACC_IMMED) {
1187                         release_sock(sk);
1188                         return -ENOTCONN;
1189                 }
1190
1191                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1192         } else {
1193                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1194         }
1195
1196         release_sock(sk);
1197
1198         return sizeof(struct sockaddr_dn);
1199 }
1200
1201
1202 static __poll_t dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1203 {
1204         struct sock *sk = sock->sk;
1205         struct dn_scp *scp = DN_SK(sk);
1206         __poll_t mask = datagram_poll(file, sock, wait);
1207
1208         if (!skb_queue_empty_lockless(&scp->other_receive_queue))
1209                 mask |= EPOLLRDBAND;
1210
1211         return mask;
1212 }
1213
1214 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1215 {
1216         struct sock *sk = sock->sk;
1217         struct dn_scp *scp = DN_SK(sk);
1218         int err = -EOPNOTSUPP;
1219         long amount = 0;
1220         struct sk_buff *skb;
1221         int val;
1222
1223         switch(cmd)
1224         {
1225         case SIOCGIFADDR:
1226         case SIOCSIFADDR:
1227                 return dn_dev_ioctl(cmd, (void __user *)arg);
1228
1229         case SIOCATMARK:
1230                 lock_sock(sk);
1231                 val = !skb_queue_empty(&scp->other_receive_queue);
1232                 if (scp->state != DN_RUN)
1233                         val = -ENOTCONN;
1234                 release_sock(sk);
1235                 return val;
1236
1237         case TIOCOUTQ:
1238                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1239                 if (amount < 0)
1240                         amount = 0;
1241                 err = put_user(amount, (int __user *)arg);
1242                 break;
1243
1244         case TIOCINQ:
1245                 lock_sock(sk);
1246                 skb = skb_peek(&scp->other_receive_queue);
1247                 if (skb) {
1248                         amount = skb->len;
1249                 } else {
1250                         skb_queue_walk(&sk->sk_receive_queue, skb)
1251                                 amount += skb->len;
1252                 }
1253                 release_sock(sk);
1254                 err = put_user(amount, (int __user *)arg);
1255                 break;
1256
1257         default:
1258                 err = -ENOIOCTLCMD;
1259                 break;
1260         }
1261
1262         return err;
1263 }
1264
1265 static int dn_listen(struct socket *sock, int backlog)
1266 {
1267         struct sock *sk = sock->sk;
1268         int err = -EINVAL;
1269
1270         lock_sock(sk);
1271
1272         if (sock_flag(sk, SOCK_ZAPPED))
1273                 goto out;
1274
1275         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1276                 goto out;
1277
1278         sk->sk_max_ack_backlog = backlog;
1279         sk->sk_ack_backlog     = 0;
1280         sk->sk_state           = TCP_LISTEN;
1281         err                 = 0;
1282         dn_rehash_sock(sk);
1283
1284 out:
1285         release_sock(sk);
1286
1287         return err;
1288 }
1289
1290
1291 static int dn_shutdown(struct socket *sock, int how)
1292 {
1293         struct sock *sk = sock->sk;
1294         struct dn_scp *scp = DN_SK(sk);
1295         int err = -ENOTCONN;
1296
1297         lock_sock(sk);
1298
1299         if (sock->state == SS_UNCONNECTED)
1300                 goto out;
1301
1302         err = 0;
1303         if (sock->state == SS_DISCONNECTING)
1304                 goto out;
1305
1306         err = -EINVAL;
1307         if (scp->state == DN_O)
1308                 goto out;
1309
1310         if (how != SHUT_RDWR)
1311                 goto out;
1312
1313         sk->sk_shutdown = SHUTDOWN_MASK;
1314         dn_destroy_sock(sk);
1315         err = 0;
1316
1317 out:
1318         release_sock(sk);
1319
1320         return err;
1321 }
1322
1323 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
1324 {
1325         struct sock *sk = sock->sk;
1326         int err;
1327
1328         lock_sock(sk);
1329         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1330         release_sock(sk);
1331 #ifdef CONFIG_NETFILTER
1332         /* we need to exclude all possible ENOPROTOOPTs except default case */
1333         if (err == -ENOPROTOOPT && optname != DSO_LINKINFO &&
1334             optname != DSO_STREAM && optname != DSO_SEQPACKET)
1335                 err = nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1336 #endif
1337
1338         return err;
1339 }
1340
1341 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, unsigned int optlen, int flags)
1342 {
1343         struct  sock *sk = sock->sk;
1344         struct dn_scp *scp = DN_SK(sk);
1345         long timeo;
1346         union {
1347                 struct optdata_dn opt;
1348                 struct accessdata_dn acc;
1349                 int mode;
1350                 unsigned long win;
1351                 int val;
1352                 unsigned char services;
1353                 unsigned char info;
1354         } u;
1355         int err;
1356
1357         if (optlen && !optval)
1358                 return -EINVAL;
1359
1360         if (optlen > sizeof(u))
1361                 return -EINVAL;
1362
1363         if (copy_from_user(&u, optval, optlen))
1364                 return -EFAULT;
1365
1366         switch (optname) {
1367         case DSO_CONDATA:
1368                 if (sock->state == SS_CONNECTED)
1369                         return -EISCONN;
1370                 if ((scp->state != DN_O) && (scp->state != DN_CR))
1371                         return -EINVAL;
1372
1373                 if (optlen != sizeof(struct optdata_dn))
1374                         return -EINVAL;
1375
1376                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1377                         return -EINVAL;
1378
1379                 memcpy(&scp->conndata_out, &u.opt, optlen);
1380                 break;
1381
1382         case DSO_DISDATA:
1383                 if (sock->state != SS_CONNECTED &&
1384                     scp->accept_mode == ACC_IMMED)
1385                         return -ENOTCONN;
1386
1387                 if (optlen != sizeof(struct optdata_dn))
1388                         return -EINVAL;
1389
1390                 if (le16_to_cpu(u.opt.opt_optl) > 16)
1391                         return -EINVAL;
1392
1393                 memcpy(&scp->discdata_out, &u.opt, optlen);
1394                 break;
1395
1396         case DSO_CONACCESS:
1397                 if (sock->state == SS_CONNECTED)
1398                         return -EISCONN;
1399                 if (scp->state != DN_O)
1400                         return -EINVAL;
1401
1402                 if (optlen != sizeof(struct accessdata_dn))
1403                         return -EINVAL;
1404
1405                 if ((u.acc.acc_accl > DN_MAXACCL) ||
1406                     (u.acc.acc_passl > DN_MAXACCL) ||
1407                     (u.acc.acc_userl > DN_MAXACCL))
1408                         return -EINVAL;
1409
1410                 memcpy(&scp->accessdata, &u.acc, optlen);
1411                 break;
1412
1413         case DSO_ACCEPTMODE:
1414                 if (sock->state == SS_CONNECTED)
1415                         return -EISCONN;
1416                 if (scp->state != DN_O)
1417                         return -EINVAL;
1418
1419                 if (optlen != sizeof(int))
1420                         return -EINVAL;
1421
1422                 if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1423                         return -EINVAL;
1424
1425                 scp->accept_mode = (unsigned char)u.mode;
1426                 break;
1427
1428         case DSO_CONACCEPT:
1429                 if (scp->state != DN_CR)
1430                         return -EINVAL;
1431                 timeo = sock_rcvtimeo(sk, 0);
1432                 err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1433                 return err;
1434
1435         case DSO_CONREJECT:
1436                 if (scp->state != DN_CR)
1437                         return -EINVAL;
1438
1439                 scp->state = DN_DR;
1440                 sk->sk_shutdown = SHUTDOWN_MASK;
1441                 dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1442                 break;
1443
1444         case DSO_MAXWINDOW:
1445                 if (optlen != sizeof(unsigned long))
1446                         return -EINVAL;
1447                 if (u.win > NSP_MAX_WINDOW)
1448                         u.win = NSP_MAX_WINDOW;
1449                 if (u.win == 0)
1450                         return -EINVAL;
1451                 scp->max_window = u.win;
1452                 if (scp->snd_window > u.win)
1453                         scp->snd_window = u.win;
1454                 break;
1455
1456         case DSO_NODELAY:
1457                 if (optlen != sizeof(int))
1458                         return -EINVAL;
1459                 if (scp->nonagle == TCP_NAGLE_CORK)
1460                         return -EINVAL;
1461                 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_OFF;
1462                 /* if (scp->nonagle == 1) { Push pending frames } */
1463                 break;
1464
1465         case DSO_CORK:
1466                 if (optlen != sizeof(int))
1467                         return -EINVAL;
1468                 if (scp->nonagle == TCP_NAGLE_OFF)
1469                         return -EINVAL;
1470                 scp->nonagle = (u.val == 0) ? 0 : TCP_NAGLE_CORK;
1471                 /* if (scp->nonagle == 0) { Push pending frames } */
1472                 break;
1473
1474         case DSO_SERVICES:
1475                 if (optlen != sizeof(unsigned char))
1476                         return -EINVAL;
1477                 if ((u.services & ~NSP_FC_MASK) != 0x01)
1478                         return -EINVAL;
1479                 if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1480                         return -EINVAL;
1481                 scp->services_loc = u.services;
1482                 break;
1483
1484         case DSO_INFO:
1485                 if (optlen != sizeof(unsigned char))
1486                         return -EINVAL;
1487                 if (u.info & 0xfc)
1488                         return -EINVAL;
1489                 scp->info_loc = u.info;
1490                 break;
1491
1492         case DSO_LINKINFO:
1493         case DSO_STREAM:
1494         case DSO_SEQPACKET:
1495         default:
1496                 return -ENOPROTOOPT;
1497         }
1498
1499         return 0;
1500 }
1501
1502 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1503 {
1504         struct sock *sk = sock->sk;
1505         int err;
1506
1507         lock_sock(sk);
1508         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1509         release_sock(sk);
1510 #ifdef CONFIG_NETFILTER
1511         if (err == -ENOPROTOOPT && optname != DSO_STREAM &&
1512             optname != DSO_SEQPACKET && optname != DSO_CONACCEPT &&
1513             optname != DSO_CONREJECT) {
1514                 int len;
1515
1516                 if (get_user(len, optlen))
1517                         return -EFAULT;
1518
1519                 err = nf_getsockopt(sk, PF_DECnet, optname, optval, &len);
1520                 if (err >= 0)
1521                         err = put_user(len, optlen);
1522         }
1523 #endif
1524
1525         return err;
1526 }
1527
1528 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1529 {
1530         struct  sock *sk = sock->sk;
1531         struct dn_scp *scp = DN_SK(sk);
1532         struct linkinfo_dn link;
1533         unsigned int r_len;
1534         void *r_data = NULL;
1535         unsigned int val;
1536
1537         if(get_user(r_len , optlen))
1538                 return -EFAULT;
1539
1540         switch (optname) {
1541         case DSO_CONDATA:
1542                 if (r_len > sizeof(struct optdata_dn))
1543                         r_len = sizeof(struct optdata_dn);
1544                 r_data = &scp->conndata_in;
1545                 break;
1546
1547         case DSO_DISDATA:
1548                 if (r_len > sizeof(struct optdata_dn))
1549                         r_len = sizeof(struct optdata_dn);
1550                 r_data = &scp->discdata_in;
1551                 break;
1552
1553         case DSO_CONACCESS:
1554                 if (r_len > sizeof(struct accessdata_dn))
1555                         r_len = sizeof(struct accessdata_dn);
1556                 r_data = &scp->accessdata;
1557                 break;
1558
1559         case DSO_ACCEPTMODE:
1560                 if (r_len > sizeof(unsigned char))
1561                         r_len = sizeof(unsigned char);
1562                 r_data = &scp->accept_mode;
1563                 break;
1564
1565         case DSO_LINKINFO:
1566                 if (r_len > sizeof(struct linkinfo_dn))
1567                         r_len = sizeof(struct linkinfo_dn);
1568
1569                 memset(&link, 0, sizeof(link));
1570
1571                 switch (sock->state) {
1572                 case SS_CONNECTING:
1573                         link.idn_linkstate = LL_CONNECTING;
1574                         break;
1575                 case SS_DISCONNECTING:
1576                         link.idn_linkstate = LL_DISCONNECTING;
1577                         break;
1578                 case SS_CONNECTED:
1579                         link.idn_linkstate = LL_RUNNING;
1580                         break;
1581                 default:
1582                         link.idn_linkstate = LL_INACTIVE;
1583                 }
1584
1585                 link.idn_segsize = scp->segsize_rem;
1586                 r_data = &link;
1587                 break;
1588
1589         case DSO_MAXWINDOW:
1590                 if (r_len > sizeof(unsigned long))
1591                         r_len = sizeof(unsigned long);
1592                 r_data = &scp->max_window;
1593                 break;
1594
1595         case DSO_NODELAY:
1596                 if (r_len > sizeof(int))
1597                         r_len = sizeof(int);
1598                 val = (scp->nonagle == TCP_NAGLE_OFF);
1599                 r_data = &val;
1600                 break;
1601
1602         case DSO_CORK:
1603                 if (r_len > sizeof(int))
1604                         r_len = sizeof(int);
1605                 val = (scp->nonagle == TCP_NAGLE_CORK);
1606                 r_data = &val;
1607                 break;
1608
1609         case DSO_SERVICES:
1610                 if (r_len > sizeof(unsigned char))
1611                         r_len = sizeof(unsigned char);
1612                 r_data = &scp->services_rem;
1613                 break;
1614
1615         case DSO_INFO:
1616                 if (r_len > sizeof(unsigned char))
1617                         r_len = sizeof(unsigned char);
1618                 r_data = &scp->info_rem;
1619                 break;
1620
1621         case DSO_STREAM:
1622         case DSO_SEQPACKET:
1623         case DSO_CONACCEPT:
1624         case DSO_CONREJECT:
1625         default:
1626                 return -ENOPROTOOPT;
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;
1643         int len = 0;
1644
1645         if (flags & MSG_OOB)
1646                 return !skb_queue_empty(q) ? 1 : 0;
1647
1648         skb_queue_walk(q, skb) {
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
1666         return 0;
1667 }
1668
1669
1670 static int dn_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1671                       int flags)
1672 {
1673         struct sock *sk = sock->sk;
1674         struct dn_scp *scp = DN_SK(sk);
1675         struct sk_buff_head *queue = &sk->sk_receive_queue;
1676         size_t target = size > 1 ? 1 : 0;
1677         size_t copied = 0;
1678         int rv = 0;
1679         struct sk_buff *skb, *n;
1680         struct dn_skb_cb *cb = NULL;
1681         unsigned char eor = 0;
1682         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1683
1684         lock_sock(sk);
1685
1686         if (sock_flag(sk, SOCK_ZAPPED)) {
1687                 rv = -EADDRNOTAVAIL;
1688                 goto out;
1689         }
1690
1691         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1692                 rv = 0;
1693                 goto out;
1694         }
1695
1696         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1697         if (rv)
1698                 goto out;
1699
1700         if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1701                 rv = -EOPNOTSUPP;
1702                 goto out;
1703         }
1704
1705         if (flags & MSG_OOB)
1706                 queue = &scp->other_receive_queue;
1707
1708         if (flags & MSG_WAITALL)
1709                 target = size;
1710
1711
1712         /*
1713          * See if there is data ready to read, sleep if there isn't
1714          */
1715         for(;;) {
1716                 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1717
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                 add_wait_queue(sk_sleep(sk), &wait);
1748                 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1749                 sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target), &wait);
1750                 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
1751                 remove_wait_queue(sk_sleep(sk), &wait);
1752         }
1753
1754         skb_queue_walk_safe(queue, skb, n) {
1755                 unsigned int chunk = skb->len;
1756                 cb = DN_SKB_CB(skb);
1757
1758                 if ((chunk + copied) > size)
1759                         chunk = size - copied;
1760
1761                 if (memcpy_to_msg(msg, skb->data, chunk)) {
1762                         rv = -EFAULT;
1763                         break;
1764                 }
1765                 copied += chunk;
1766
1767                 if (!(flags & MSG_PEEK))
1768                         skb_pull(skb, chunk);
1769
1770                 eor = cb->nsp_flags & 0x40;
1771
1772                 if (skb->len == 0) {
1773                         skb_unlink(skb, queue);
1774                         kfree_skb(skb);
1775                         /*
1776                          * N.B. Don't refer to skb or cb after this point
1777                          * in loop.
1778                          */
1779                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1780                                 scp->flowloc_sw = DN_SEND;
1781                                 dn_nsp_send_link(sk, DN_SEND, 0);
1782                         }
1783                 }
1784
1785                 if (eor) {
1786                         if (sk->sk_type == SOCK_SEQPACKET)
1787                                 break;
1788                         if (!(flags & MSG_WAITALL))
1789                                 break;
1790                 }
1791
1792                 if (flags & MSG_OOB)
1793                         break;
1794
1795                 if (copied >= target)
1796                         break;
1797         }
1798
1799         rv = copied;
1800
1801
1802         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1803                 msg->msg_flags |= MSG_EOR;
1804
1805 out:
1806         if (rv == 0)
1807                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1808
1809         if ((rv >= 0) && msg->msg_name) {
1810                 __sockaddr_check_size(sizeof(struct sockaddr_dn));
1811                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1812                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1813         }
1814
1815         release_sock(sk);
1816
1817         return rv;
1818 }
1819
1820
1821 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1822 {
1823         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1824         if (skb_queue_len(queue) >= scp->snd_window)
1825                 return 1;
1826         if (fctype != NSP_FC_NONE) {
1827                 if (flags & MSG_OOB) {
1828                         if (scp->flowrem_oth == 0)
1829                                 return 1;
1830                 } else {
1831                         if (scp->flowrem_dat == 0)
1832                                 return 1;
1833                 }
1834         }
1835         return 0;
1836 }
1837
1838 /*
1839  * The DECnet spec requires that the "routing layer" accepts packets which
1840  * are at least 230 bytes in size. This excludes any headers which the NSP
1841  * layer might add, so we always assume that we'll be using the maximal
1842  * length header on data packets. The variation in length is due to the
1843  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1844  * make much practical difference.
1845  */
1846 unsigned int dn_mss_from_pmtu(struct net_device *dev, int mtu)
1847 {
1848         unsigned int mss = 230 - DN_MAX_NSP_DATA_HEADER;
1849         if (dev) {
1850                 struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
1851                 mtu -= LL_RESERVED_SPACE(dev);
1852                 if (dn_db->use_long)
1853                         mtu -= 21;
1854                 else
1855                         mtu -= 6;
1856                 mtu -= DN_MAX_NSP_DATA_HEADER;
1857         } else {
1858                 /*
1859                  * 21 = long header, 16 = guess at MAC header length
1860                  */
1861                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1862         }
1863         if (mtu > mss)
1864                 mss = mtu;
1865         return mss;
1866 }
1867
1868 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1869 {
1870         struct dst_entry *dst = __sk_dst_get(sk);
1871         struct dn_scp *scp = DN_SK(sk);
1872         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1873
1874         /* Other data messages are limited to 16 bytes per packet */
1875         if (flags & MSG_OOB)
1876                 return 16;
1877
1878         /* This works out the maximum size of segment we can send out */
1879         if (dst) {
1880                 u32 mtu = dst_mtu(dst);
1881                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1882         }
1883
1884         return mss_now;
1885 }
1886
1887 /*
1888  * N.B. We get the timeout wrong here, but then we always did get it
1889  * wrong before and this is another step along the road to correcting
1890  * it. It ought to get updated each time we pass through the routine,
1891  * but in practise it probably doesn't matter too much for now.
1892  */
1893 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1894                               unsigned long datalen, int noblock,
1895                               int *errcode)
1896 {
1897         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1898                                                    noblock, errcode);
1899         if (skb) {
1900                 skb->protocol = htons(ETH_P_DNA_RT);
1901                 skb->pkt_type = PACKET_OUTGOING;
1902         }
1903         return skb;
1904 }
1905
1906 static int dn_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
1907 {
1908         struct sock *sk = sock->sk;
1909         struct dn_scp *scp = DN_SK(sk);
1910         size_t mss;
1911         struct sk_buff_head *queue = &scp->data_xmit_queue;
1912         int flags = msg->msg_flags;
1913         int err = 0;
1914         size_t sent = 0;
1915         int addr_len = msg->msg_namelen;
1916         DECLARE_SOCKADDR(struct sockaddr_dn *, addr, msg->msg_name);
1917         struct sk_buff *skb = NULL;
1918         struct dn_skb_cb *cb;
1919         size_t len;
1920         unsigned char fctype;
1921         long timeo;
1922
1923         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1924                 return -EOPNOTSUPP;
1925
1926         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1927                 return -EINVAL;
1928
1929         lock_sock(sk);
1930         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1931         /*
1932          * The only difference between stream sockets and sequenced packet
1933          * sockets is that the stream sockets always behave as if MSG_EOR
1934          * has been set.
1935          */
1936         if (sock->type == SOCK_STREAM) {
1937                 if (flags & MSG_EOR) {
1938                         err = -EINVAL;
1939                         goto out;
1940                 }
1941                 flags |= MSG_EOR;
1942         }
1943
1944
1945         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1946         if (err)
1947                 goto out_err;
1948
1949         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1950                 err = -EPIPE;
1951                 if (!(flags & MSG_NOSIGNAL))
1952                         send_sig(SIGPIPE, current, 0);
1953                 goto out_err;
1954         }
1955
1956         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1957                 dst_negative_advice(sk);
1958
1959         mss = scp->segsize_rem;
1960         fctype = scp->services_rem & NSP_FC_MASK;
1961
1962         mss = dn_current_mss(sk, flags);
1963
1964         if (flags & MSG_OOB) {
1965                 queue = &scp->other_xmit_queue;
1966                 if (size > mss) {
1967                         err = -EMSGSIZE;
1968                         goto out;
1969                 }
1970         }
1971
1972         scp->persist_fxn = dn_nsp_xmit_timeout;
1973
1974         while(sent < size) {
1975                 err = sock_error(sk);
1976                 if (err)
1977                         goto out;
1978
1979                 if (signal_pending(current)) {
1980                         err = sock_intr_errno(timeo);
1981                         goto out;
1982                 }
1983
1984                 /*
1985                  * Calculate size that we wish to send.
1986                  */
1987                 len = size - sent;
1988
1989                 if (len > mss)
1990                         len = mss;
1991
1992                 /*
1993                  * Wait for queue size to go down below the window
1994                  * size.
1995                  */
1996                 if (dn_queue_too_long(scp, queue, flags)) {
1997                         DEFINE_WAIT_FUNC(wait, woken_wake_function);
1998
1999                         if (flags & MSG_DONTWAIT) {
2000                                 err = -EWOULDBLOCK;
2001                                 goto out;
2002                         }
2003
2004                         add_wait_queue(sk_sleep(sk), &wait);
2005                         sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2006                         sk_wait_event(sk, &timeo,
2007                                       !dn_queue_too_long(scp, queue, flags), &wait);
2008                         sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
2009                         remove_wait_queue(sk_sleep(sk), &wait);
2010                         continue;
2011                 }
2012
2013                 /*
2014                  * Get a suitably sized skb.
2015                  * 64 is a bit of a hack really, but its larger than any
2016                  * link-layer headers and has served us well as a good
2017                  * guess as to their real length.
2018                  */
2019                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2020                                          flags & MSG_DONTWAIT, &err);
2021
2022                 if (err)
2023                         break;
2024
2025                 if (!skb)
2026                         continue;
2027
2028                 cb = DN_SKB_CB(skb);
2029
2030                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2031
2032                 if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
2033                         err = -EFAULT;
2034                         goto out;
2035                 }
2036
2037                 if (flags & MSG_OOB) {
2038                         cb->nsp_flags = 0x30;
2039                         if (fctype != NSP_FC_NONE)
2040                                 scp->flowrem_oth--;
2041                 } else {
2042                         cb->nsp_flags = 0x00;
2043                         if (scp->seg_total == 0)
2044                                 cb->nsp_flags |= 0x20;
2045
2046                         scp->seg_total += len;
2047
2048                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2049                                 cb->nsp_flags |= 0x40;
2050                                 scp->seg_total = 0;
2051                                 if (fctype == NSP_FC_SCMC)
2052                                         scp->flowrem_dat--;
2053                         }
2054                         if (fctype == NSP_FC_SRC)
2055                                 scp->flowrem_dat--;
2056                 }
2057
2058                 sent += len;
2059                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2060                 skb = NULL;
2061
2062                 scp->persist = dn_nsp_persist(sk);
2063
2064         }
2065 out:
2066
2067         kfree_skb(skb);
2068
2069         release_sock(sk);
2070
2071         return sent ? sent : err;
2072
2073 out_err:
2074         err = sk_stream_error(sk, flags, err);
2075         release_sock(sk);
2076         return err;
2077 }
2078
2079 static int dn_device_event(struct notifier_block *this, unsigned long event,
2080                            void *ptr)
2081 {
2082         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2083
2084         if (!net_eq(dev_net(dev), &init_net))
2085                 return NOTIFY_DONE;
2086
2087         switch (event) {
2088         case NETDEV_UP:
2089                 dn_dev_up(dev);
2090                 break;
2091         case NETDEV_DOWN:
2092                 dn_dev_down(dev);
2093                 break;
2094         default:
2095                 break;
2096         }
2097
2098         return NOTIFY_DONE;
2099 }
2100
2101 static struct notifier_block dn_dev_notifier = {
2102         .notifier_call = dn_device_event,
2103 };
2104
2105 static struct packet_type dn_dix_packet_type __read_mostly = {
2106         .type =         cpu_to_be16(ETH_P_DNA_RT),
2107         .func =         dn_route_rcv,
2108 };
2109
2110 #ifdef CONFIG_PROC_FS
2111 struct dn_iter_state {
2112         int bucket;
2113 };
2114
2115 static struct sock *dn_socket_get_first(struct seq_file *seq)
2116 {
2117         struct dn_iter_state *state = seq->private;
2118         struct sock *n = NULL;
2119
2120         for(state->bucket = 0;
2121             state->bucket < DN_SK_HASH_SIZE;
2122             ++state->bucket) {
2123                 n = sk_head(&dn_sk_hash[state->bucket]);
2124                 if (n)
2125                         break;
2126         }
2127
2128         return n;
2129 }
2130
2131 static struct sock *dn_socket_get_next(struct seq_file *seq,
2132                                        struct sock *n)
2133 {
2134         struct dn_iter_state *state = seq->private;
2135
2136         n = sk_next(n);
2137 try_again:
2138         if (n)
2139                 goto out;
2140         if (++state->bucket >= DN_SK_HASH_SIZE)
2141                 goto out;
2142         n = sk_head(&dn_sk_hash[state->bucket]);
2143         goto try_again;
2144 out:
2145         return n;
2146 }
2147
2148 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2149 {
2150         struct sock *sk = dn_socket_get_first(seq);
2151
2152         if (sk) {
2153                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2154                         --*pos;
2155         }
2156         return *pos ? NULL : sk;
2157 }
2158
2159 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2160 {
2161         void *rc;
2162         read_lock_bh(&dn_hash_lock);
2163         rc = socket_get_idx(seq, &pos);
2164         if (!rc) {
2165                 read_unlock_bh(&dn_hash_lock);
2166         }
2167         return rc;
2168 }
2169
2170 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2171 {
2172         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2173 }
2174
2175 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2176 {
2177         void *rc;
2178
2179         if (v == SEQ_START_TOKEN) {
2180                 rc = dn_socket_get_idx(seq, 0);
2181                 goto out;
2182         }
2183
2184         rc = dn_socket_get_next(seq, v);
2185         if (rc)
2186                 goto out;
2187         read_unlock_bh(&dn_hash_lock);
2188 out:
2189         ++*pos;
2190         return rc;
2191 }
2192
2193 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2194 {
2195         if (v && v != SEQ_START_TOKEN)
2196                 read_unlock_bh(&dn_hash_lock);
2197 }
2198
2199 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2200
2201 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2202 {
2203         int i;
2204
2205         switch (le16_to_cpu(dn->sdn_objnamel)) {
2206         case 0:
2207                 sprintf(buf, "%d", dn->sdn_objnum);
2208                 break;
2209         default:
2210                 for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2211                         buf[i] = dn->sdn_objname[i];
2212                         if (IS_NOT_PRINTABLE(buf[i]))
2213                                 buf[i] = '.';
2214                 }
2215                 buf[i] = 0;
2216         }
2217 }
2218
2219 static char *dn_state2asc(unsigned char state)
2220 {
2221         switch (state) {
2222         case DN_O:
2223                 return "OPEN";
2224         case DN_CR:
2225                 return "  CR";
2226         case DN_DR:
2227                 return "  DR";
2228         case DN_DRC:
2229                 return " DRC";
2230         case DN_CC:
2231                 return "  CC";
2232         case DN_CI:
2233                 return "  CI";
2234         case DN_NR:
2235                 return "  NR";
2236         case DN_NC:
2237                 return "  NC";
2238         case DN_CD:
2239                 return "  CD";
2240         case DN_RJ:
2241                 return "  RJ";
2242         case DN_RUN:
2243                 return " RUN";
2244         case DN_DI:
2245                 return "  DI";
2246         case DN_DIC:
2247                 return " DIC";
2248         case DN_DN:
2249                 return "  DN";
2250         case DN_CL:
2251                 return "  CL";
2252         case DN_CN:
2253                 return "  CN";
2254         }
2255
2256         return "????";
2257 }
2258
2259 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2260 {
2261         struct dn_scp *scp = DN_SK(sk);
2262         char buf1[DN_ASCBUF_LEN];
2263         char buf2[DN_ASCBUF_LEN];
2264         char local_object[DN_MAXOBJL+3];
2265         char remote_object[DN_MAXOBJL+3];
2266
2267         dn_printable_object(&scp->addr, local_object);
2268         dn_printable_object(&scp->peer, remote_object);
2269
2270         seq_printf(seq,
2271                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2272                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2273                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2274                    scp->addrloc,
2275                    scp->numdat,
2276                    scp->numoth,
2277                    scp->ackxmt_dat,
2278                    scp->ackxmt_oth,
2279                    scp->flowloc_sw,
2280                    local_object,
2281                    dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2282                    scp->addrrem,
2283                    scp->numdat_rcv,
2284                    scp->numoth_rcv,
2285                    scp->ackrcv_dat,
2286                    scp->ackrcv_oth,
2287                    scp->flowrem_sw,
2288                    remote_object,
2289                    dn_state2asc(scp->state),
2290                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2291 }
2292
2293 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2294 {
2295         if (v == SEQ_START_TOKEN) {
2296                 seq_puts(seq, "Local                                              Remote\n");
2297         } else {
2298                 dn_socket_format_entry(seq, v);
2299         }
2300         return 0;
2301 }
2302
2303 static const struct seq_operations dn_socket_seq_ops = {
2304         .start  = dn_socket_seq_start,
2305         .next   = dn_socket_seq_next,
2306         .stop   = dn_socket_seq_stop,
2307         .show   = dn_socket_seq_show,
2308 };
2309 #endif
2310
2311 static const struct net_proto_family    dn_family_ops = {
2312         .family =       AF_DECnet,
2313         .create =       dn_create,
2314         .owner  =       THIS_MODULE,
2315 };
2316
2317 static const struct proto_ops dn_proto_ops = {
2318         .family =       AF_DECnet,
2319         .owner =        THIS_MODULE,
2320         .release =      dn_release,
2321         .bind =         dn_bind,
2322         .connect =      dn_connect,
2323         .socketpair =   sock_no_socketpair,
2324         .accept =       dn_accept,
2325         .getname =      dn_getname,
2326         .poll =         dn_poll,
2327         .ioctl =        dn_ioctl,
2328         .listen =       dn_listen,
2329         .shutdown =     dn_shutdown,
2330         .setsockopt =   dn_setsockopt,
2331         .getsockopt =   dn_getsockopt,
2332         .sendmsg =      dn_sendmsg,
2333         .recvmsg =      dn_recvmsg,
2334         .mmap =         sock_no_mmap,
2335         .sendpage =     sock_no_sendpage,
2336 };
2337
2338 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2339 MODULE_AUTHOR("Linux DECnet Project Team");
2340 MODULE_LICENSE("GPL");
2341 MODULE_ALIAS_NETPROTO(PF_DECnet);
2342
2343 static const char banner[] __initconst = KERN_INFO
2344 "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2345
2346 static int __init decnet_init(void)
2347 {
2348         int rc;
2349
2350         printk(banner);
2351
2352         rc = proto_register(&dn_proto, 1);
2353         if (rc != 0)
2354                 goto out;
2355
2356         dn_neigh_init();
2357         dn_dev_init();
2358         dn_route_init();
2359         dn_fib_init();
2360
2361         sock_register(&dn_family_ops);
2362         dev_add_pack(&dn_dix_packet_type);
2363         register_netdevice_notifier(&dn_dev_notifier);
2364
2365         proc_create_seq_private("decnet", 0444, init_net.proc_net,
2366                         &dn_socket_seq_ops, sizeof(struct dn_iter_state),
2367                         NULL);
2368         dn_register_sysctl();
2369 out:
2370         return rc;
2371
2372 }
2373 module_init(decnet_init);
2374
2375 /*
2376  * Prevent DECnet module unloading until its fixed properly.
2377  * Requires an audit of the code to check for memory leaks and
2378  * initialisation problems etc.
2379  */
2380 #if 0
2381 static void __exit decnet_exit(void)
2382 {
2383         sock_unregister(AF_DECnet);
2384         rtnl_unregister_all(PF_DECnet);
2385         dev_remove_pack(&dn_dix_packet_type);
2386
2387         dn_unregister_sysctl();
2388
2389         unregister_netdevice_notifier(&dn_dev_notifier);
2390
2391         dn_route_cleanup();
2392         dn_dev_cleanup();
2393         dn_neigh_cleanup();
2394         dn_fib_cleanup();
2395
2396         remove_proc_entry("decnet", init_net.proc_net);
2397
2398         proto_unregister(&dn_proto);
2399
2400         rcu_barrier(); /* Wait for completion of call_rcu()'s */
2401 }
2402 module_exit(decnet_exit);
2403 #endif