linux/net/decnet/af_decnet.c
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   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
  59HISTORY:
  60
  61Version           Kernel     Date       Author/Comments
  62-------           ------     ----       ---------------
  63Version 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
  70Version 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
  75Version 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
  83Version 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                                       -
  89Version 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                                       -
  95Version 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
 142struct dn_sock {
 143        struct sock sk;
 144        struct dn_scp scp;
 145};
 146
 147static 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
 154static const struct proto_ops dn_proto_ops;
 155static DEFINE_RWLOCK(dn_hash_lock);
 156static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 157static struct hlist_head dn_wild_sk;
 158static atomic_t decnet_memory_allocated;
 159
 160static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
 161static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 162
 163static 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 */
 176static 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
 192static unsigned short port_alloc(struct sock *sk)
 193{
 194        struct dn_scp *scp = DN_SK(sk);
 195static 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 */
 213static 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;
 232out:
 233        write_unlock_bh(&dn_hash_lock);
 234        return rv;
 235}
 236
 237static 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
 244static 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
 251static 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 */
 272static 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
 288int 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 */
 323int 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
 375struct 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
 414struct 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;
 434found:
 435        read_unlock(&dn_hash_lock);
 436        return sk;
 437}
 438
 439
 440
 441static 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(xchg(&sk->sk_dst_cache, NULL));
 450}
 451
 452static int dn_memory_pressure;
 453
 454static void dn_enter_memory_pressure(struct sock *sk)
 455{
 456        if (!dn_memory_pressure) {
 457                dn_memory_pressure = 1;
 458        }
 459}
 460
 461static 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
 474static 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);
 543out:
 544        return sk;
 545}
 546
 547/*
 548 * Keepalive timer.
 549 * FIXME: Should respond to SO_KEEPALIVE etc.
 550 */
 551static 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 */
 572int 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, GFP_ATOMIC);
 595                                return 0;
 596                        }
 597        }
 598
 599        scp->persist = (HZ * decnet_time_wait);
 600
 601        if (sk->sk_socket)
 602                return 0;
 603
 604        if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
 605                dn_unhash_sock(sk);
 606                sock_put(sk);
 607                return 1;
 608        }
 609
 610        return 0;
 611}
 612
 613static void dn_destroy_sock(struct sock *sk)
 614{
 615        struct dn_scp *scp = DN_SK(sk);
 616
 617        scp->nsp_rxtshift = 0; /* reset back off */
 618
 619        if (sk->sk_socket) {
 620                if (sk->sk_socket->state != SS_UNCONNECTED)
 621                        sk->sk_socket->state = SS_DISCONNECTING;
 622        }
 623
 624        sk->sk_state = TCP_CLOSE;
 625
 626        switch(scp->state) {
 627                case DN_DN:
 628                        dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 629                                         sk->sk_allocation);
 630                        scp->persist_fxn = dn_destroy_timer;
 631                        scp->persist = dn_nsp_persist(sk);
 632                        break;
 633                case DN_CR:
 634                        scp->state = DN_DR;
 635                        goto disc_reject;
 636                case DN_RUN:
 637                        scp->state = DN_DI;
 638                case DN_DI:
 639                case DN_DR:
 640disc_reject:
 641                        dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 642                case DN_NC:
 643                case DN_NR:
 644                case DN_RJ:
 645                case DN_DIC:
 646                case DN_CN:
 647                case DN_DRC:
 648                case DN_CI:
 649                case DN_CD:
 650                        scp->persist_fxn = dn_destroy_timer;
 651                        scp->persist = dn_nsp_persist(sk);
 652                        break;
 653                default:
 654                        printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 655                case DN_O:
 656                        dn_stop_slow_timer(sk);
 657
 658                        dn_unhash_sock_bh(sk);
 659                        sock_put(sk);
 660
 661                        break;
 662        }
 663}
 664
 665char *dn_addr2asc(__u16 addr, char *buf)
 666{
 667        unsigned short node, area;
 668
 669        node = addr & 0x03ff;
 670        area = addr >> 10;
 671        sprintf(buf, "%hd.%hd", area, node);
 672
 673        return buf;
 674}
 675
 676
 677
 678static int dn_create(struct net *net, struct socket *sock, int protocol)
 679{
 680        struct sock *sk;
 681
 682        if (net != &init_net)
 683                return -EAFNOSUPPORT;
 684
 685        switch(sock->type) {
 686                case SOCK_SEQPACKET:
 687                        if (protocol != DNPROTO_NSP)
 688                                return -EPROTONOSUPPORT;
 689                        break;
 690                case SOCK_STREAM:
 691                        break;
 692                default:
 693                        return -ESOCKTNOSUPPORT;
 694        }
 695
 696
 697        if ((sk = dn_alloc_sock(net, sock, GFP_KERNEL)) == NULL)
 698                return -ENOBUFS;
 699
 700        sk->sk_protocol = protocol;
 701
 702        return 0;
 703}
 704
 705
 706static int
 707dn_release(struct socket *sock)
 708{
 709        struct sock *sk = sock->sk;
 710
 711        if (sk) {
 712                sock_orphan(sk);
 713                sock_hold(sk);
 714                lock_sock(sk);
 715                dn_destroy_sock(sk);
 716                release_sock(sk);
 717                sock_put(sk);
 718        }
 719
 720        return 0;
 721}
 722
 723static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 724{
 725        struct sock *sk = sock->sk;
 726        struct dn_scp *scp = DN_SK(sk);
 727        struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 728        struct net_device *dev, *ldev;
 729        int rv;
 730
 731        if (addr_len != sizeof(struct sockaddr_dn))
 732                return -EINVAL;
 733
 734        if (saddr->sdn_family != AF_DECnet)
 735                return -EINVAL;
 736
 737        if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
 738                return -EINVAL;
 739
 740        if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
 741                return -EINVAL;
 742
 743        if (saddr->sdn_flags & ~SDF_WILD)
 744                return -EINVAL;
 745
 746        if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 747            (saddr->sdn_flags & SDF_WILD)))
 748                return -EACCES;
 749
 750        if (!(saddr->sdn_flags & SDF_WILD)) {
 751                if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
 752                        read_lock(&dev_base_lock);
 753                        ldev = NULL;
 754                        for_each_netdev(&init_net, dev) {
 755                                if (!dev->dn_ptr)
 756                                        continue;
 757                                if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
 758                                        ldev = dev;
 759                                        break;
 760                                }
 761                        }
 762                        read_unlock(&dev_base_lock);
 763                        if (ldev == NULL)
 764                                return -EADDRNOTAVAIL;
 765                }
 766        }
 767
 768        rv = -EINVAL;
 769        lock_sock(sk);
 770        if (sock_flag(sk, SOCK_ZAPPED)) {
 771                memcpy(&scp->addr, saddr, addr_len);
 772                sock_reset_flag(sk, SOCK_ZAPPED);
 773
 774                rv = dn_hash_sock(sk);
 775                if (rv)
 776                        sock_set_flag(sk, SOCK_ZAPPED);
 777        }
 778        release_sock(sk);
 779
 780        return rv;
 781}
 782
 783
 784static int dn_auto_bind(struct socket *sock)
 785{
 786        struct sock *sk = sock->sk;
 787        struct dn_scp *scp = DN_SK(sk);
 788        int rv;
 789
 790        sock_reset_flag(sk, SOCK_ZAPPED);
 791
 792        scp->addr.sdn_flags  = 0;
 793        scp->addr.sdn_objnum = 0;
 794
 795        /*
 796         * This stuff is to keep compatibility with Eduardo's
 797         * patch. I hope I can dispense with it shortly...
 798         */
 799        if ((scp->accessdata.acc_accl != 0) &&
 800                (scp->accessdata.acc_accl <= 12)) {
 801
 802                scp->addr.sdn_objnamel = cpu_to_le16(scp->accessdata.acc_accl);
 803                memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, le16_to_cpu(scp->addr.sdn_objnamel));
 804
 805                scp->accessdata.acc_accl = 0;
 806                memset(scp->accessdata.acc_acc, 0, 40);
 807        }
 808        /* End of compatibility stuff */
 809
 810        scp->addr.sdn_add.a_len = cpu_to_le16(2);
 811        rv = dn_dev_bind_default((__le16 *)scp->addr.sdn_add.a_addr);
 812        if (rv == 0) {
 813                rv = dn_hash_sock(sk);
 814                if (rv)
 815                        sock_set_flag(sk, SOCK_ZAPPED);
 816        }
 817
 818        return rv;
 819}
 820
 821static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
 822{
 823        struct dn_scp *scp = DN_SK(sk);
 824        DEFINE_WAIT(wait);
 825        int err;
 826
 827        if (scp->state != DN_CR)
 828                return -EINVAL;
 829
 830        scp->state = DN_CC;
 831        scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
 832        dn_send_conn_conf(sk, allocation);
 833
 834        prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 835        for(;;) {
 836                release_sock(sk);
 837                if (scp->state == DN_CC)
 838                        *timeo = schedule_timeout(*timeo);
 839                lock_sock(sk);
 840                err = 0;
 841                if (scp->state == DN_RUN)
 842                        break;
 843                err = sock_error(sk);
 844                if (err)
 845                        break;
 846                err = sock_intr_errno(*timeo);
 847                if (signal_pending(current))
 848                        break;
 849                err = -EAGAIN;
 850                if (!*timeo)
 851                        break;
 852                prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 853        }
 854        finish_wait(sk->sk_sleep, &wait);
 855        if (err == 0) {
 856                sk->sk_socket->state = SS_CONNECTED;
 857        } else if (scp->state != DN_CC) {
 858                sk->sk_socket->state = SS_UNCONNECTED;
 859        }
 860        return err;
 861}
 862
 863static int dn_wait_run(struct sock *sk, long *timeo)
 864{
 865        struct dn_scp *scp = DN_SK(sk);
 866        DEFINE_WAIT(wait);
 867        int err = 0;
 868
 869        if (scp->state == DN_RUN)
 870                goto out;
 871
 872        if (!*timeo)
 873                return -EALREADY;
 874
 875        prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 876        for(;;) {
 877                release_sock(sk);
 878                if (scp->state == DN_CI || scp->state == DN_CC)
 879                        *timeo = schedule_timeout(*timeo);
 880                lock_sock(sk);
 881                err = 0;
 882                if (scp->state == DN_RUN)
 883                        break;
 884                err = sock_error(sk);
 885                if (err)
 886                        break;
 887                err = sock_intr_errno(*timeo);
 888                if (signal_pending(current))
 889                        break;
 890                err = -ETIMEDOUT;
 891                if (!*timeo)
 892                        break;
 893                prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 894        }
 895        finish_wait(sk->sk_sleep, &wait);
 896out:
 897        if (err == 0) {
 898                sk->sk_socket->state = SS_CONNECTED;
 899        } else if (scp->state != DN_CI && scp->state != DN_CC) {
 900                sk->sk_socket->state = SS_UNCONNECTED;
 901        }
 902        return err;
 903}
 904
 905static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 906{
 907        struct socket *sock = sk->sk_socket;
 908        struct dn_scp *scp = DN_SK(sk);
 909        int err = -EISCONN;
 910        struct flowi fl;
 911
 912        if (sock->state == SS_CONNECTED)
 913                goto out;
 914
 915        if (sock->state == SS_CONNECTING) {
 916                err = 0;
 917                if (scp->state == DN_RUN) {
 918                        sock->state = SS_CONNECTED;
 919                        goto out;
 920                }
 921                err = -ECONNREFUSED;
 922                if (scp->state != DN_CI && scp->state != DN_CC) {
 923                        sock->state = SS_UNCONNECTED;
 924                        goto out;
 925                }
 926                return dn_wait_run(sk, timeo);
 927        }
 928
 929        err = -EINVAL;
 930        if (scp->state != DN_O)
 931                goto out;
 932
 933        if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 934                goto out;
 935        if (addr->sdn_family != AF_DECnet)
 936                goto out;
 937        if (addr->sdn_flags & SDF_WILD)
 938                goto out;
 939
 940        if (sock_flag(sk, SOCK_ZAPPED)) {
 941                err = dn_auto_bind(sk->sk_socket);
 942                if (err)
 943                        goto out;
 944        }
 945
 946        memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 947
 948        err = -EHOSTUNREACH;
 949        memset(&fl, 0, sizeof(fl));
 950        fl.oif = sk->sk_bound_dev_if;
 951        fl.fld_dst = dn_saddr2dn(&scp->peer);
 952        fl.fld_src = dn_saddr2dn(&scp->addr);
 953        dn_sk_ports_copy(&fl, scp);
 954        fl.proto = DNPROTO_NSP;
 955        if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
 956                goto out;
 957        sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 958        sock->state = SS_CONNECTING;
 959        scp->state = DN_CI;
 960        scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
 961
 962        dn_nsp_send_conninit(sk, NSP_CI);
 963        err = -EINPROGRESS;
 964        if (*timeo) {
 965                err = dn_wait_run(sk, timeo);
 966        }
 967out:
 968        return err;
 969}
 970
 971static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 972{
 973        struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 974        struct sock *sk = sock->sk;
 975        int err;
 976        long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 977
 978        lock_sock(sk);
 979        err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 980        release_sock(sk);
 981
 982        return err;
 983}
 984
 985static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 986{
 987        struct dn_scp *scp = DN_SK(sk);
 988
 989        switch(scp->state) {
 990                case DN_RUN:
 991                        return 0;
 992                case DN_CR:
 993                        return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 994                case DN_CI:
 995                case DN_CC:
 996                        return dn_wait_run(sk, timeo);
 997                case DN_O:
 998                        return __dn_connect(sk, addr, addrlen, timeo, flags);
 999        }
1000
1001        return -EINVAL;
1002}
1003
1004
1005static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
1006{
1007        unsigned char *ptr = skb->data;
1008
1009        acc->acc_userl = *ptr++;
1010        memcpy(&acc->acc_user, ptr, acc->acc_userl);
1011        ptr += acc->acc_userl;
1012
1013        acc->acc_passl = *ptr++;
1014        memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1015        ptr += acc->acc_passl;
1016
1017        acc->acc_accl = *ptr++;
1018        memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1019
1020        skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1021
1022}
1023
1024static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1025{
1026        unsigned char *ptr = skb->data;
1027        u16 len = *ptr++; /* yes, it's 8bit on the wire */
1028
1029        BUG_ON(len > 16); /* we've checked the contents earlier */
1030        opt->opt_optl   = cpu_to_le16(len);
1031        opt->opt_status = 0;
1032        memcpy(opt->opt_data, ptr, len);
1033        skb_pull(skb, len + 1);
1034}
1035
1036static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1037{
1038        DEFINE_WAIT(wait);
1039        struct sk_buff *skb = NULL;
1040        int err = 0;
1041
1042        prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1043        for(;;) {
1044                release_sock(sk);
1045                skb = skb_dequeue(&sk->sk_receive_queue);
1046                if (skb == NULL) {
1047                        *timeo = schedule_timeout(*timeo);
1048                        skb = skb_dequeue(&sk->sk_receive_queue);
1049                }
1050                lock_sock(sk);
1051                if (skb != NULL)
1052                        break;
1053                err = -EINVAL;
1054                if (sk->sk_state != TCP_LISTEN)
1055                        break;
1056                err = sock_intr_errno(*timeo);
1057                if (signal_pending(current))
1058                        break;
1059                err = -EAGAIN;
1060                if (!*timeo)
1061                        break;
1062                prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1063        }
1064        finish_wait(sk->sk_sleep, &wait);
1065
1066        return skb == NULL ? ERR_PTR(err) : skb;
1067}
1068
1069static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1070{
1071        struct sock *sk = sock->sk, *newsk;
1072        struct sk_buff *skb = NULL;
1073        struct dn_skb_cb *cb;
1074        unsigned char menuver;
1075        int err = 0;
1076        unsigned char type;
1077        long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1078
1079        lock_sock(sk);
1080
1081        if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1082                release_sock(sk);
1083                return -EINVAL;
1084        }
1085
1086        skb = skb_dequeue(&sk->sk_receive_queue);
1087        if (skb == NULL) {
1088                skb = dn_wait_for_connect(sk, &timeo);
1089                if (IS_ERR(skb)) {
1090                        release_sock(sk);
1091                        return PTR_ERR(skb);
1092                }
1093        }
1094
1095        cb = DN_SKB_CB(skb);
1096        sk->sk_ack_backlog--;
1097        newsk = dn_alloc_sock(sock_net(sk), newsock, sk->sk_allocation);
1098        if (newsk == NULL) {
1099                release_sock(sk);
1100                kfree_skb(skb);
1101                return -ENOBUFS;
1102        }
1103        release_sock(sk);
1104
1105        dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1106        skb->dst = NULL;
1107
1108        DN_SK(newsk)->state        = DN_CR;
1109        DN_SK(newsk)->addrrem      = cb->src_port;
1110        DN_SK(newsk)->services_rem = cb->services;
1111        DN_SK(newsk)->info_rem     = cb->info;
1112        DN_SK(newsk)->segsize_rem  = cb->segsize;
1113        DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1114
1115        if (DN_SK(newsk)->segsize_rem < 230)
1116                DN_SK(newsk)->segsize_rem = 230;
1117
1118        if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1119                DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1120
1121        newsk->sk_state  = TCP_LISTEN;
1122        memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1123
1124        /*
1125         * If we are listening on a wild socket, we don't want
1126         * the newly created socket on the wrong hash queue.
1127         */
1128        DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1129
1130        skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1131        skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1132        *(__le16 *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1133        *(__le16 *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1134
1135        menuver = *skb->data;
1136        skb_pull(skb, 1);
1137
1138        if (menuver & DN_MENUVER_ACC)
1139                dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1140
1141        if (menuver & DN_MENUVER_USR)
1142                dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1143
1144        if (menuver & DN_MENUVER_PRX)
1145                DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1146
1147        if (menuver & DN_MENUVER_UIC)
1148                DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1149
1150        kfree_skb(skb);
1151
1152        memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1153                sizeof(struct optdata_dn));
1154        memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1155                sizeof(struct optdata_dn));
1156
1157        lock_sock(newsk);
1158        err = dn_hash_sock(newsk);
1159        if (err == 0) {
1160                sock_reset_flag(newsk, SOCK_ZAPPED);
1161                dn_send_conn_ack(newsk);
1162
1163                /*
1164                 * Here we use sk->sk_allocation since although the conn conf is
1165                 * for the newsk, the context is the old socket.
1166                 */
1167                if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1168                        err = dn_confirm_accept(newsk, &timeo,
1169                                                sk->sk_allocation);
1170        }
1171        release_sock(newsk);
1172        return err;
1173}
1174
1175
1176static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1177{
1178        struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1179        struct sock *sk = sock->sk;
1180        struct dn_scp *scp = DN_SK(sk);
1181
1182        *uaddr_len = sizeof(struct sockaddr_dn);
1183
1184        lock_sock(sk);
1185
1186        if (peer) {
1187                if ((sock->state != SS_CONNECTED &&
1188                     sock->state != SS_CONNECTING) &&
1189                    scp->accept_mode == ACC_IMMED) {
1190                        release_sock(sk);
1191                        return -ENOTCONN;
1192                }
1193
1194                memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1195        } else {
1196                memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1197        }
1198
1199        release_sock(sk);
1200
1201        return 0;
1202}
1203
1204
1205static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1206{
1207        struct sock *sk = sock->sk;
1208        struct dn_scp *scp = DN_SK(sk);
1209        int mask = datagram_poll(file, sock, wait);
1210
1211        if (!skb_queue_empty(&scp->other_receive_queue))
1212                mask |= POLLRDBAND;
1213
1214        return mask;
1215}
1216
1217static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1218{
1219        struct sock *sk = sock->sk;
1220        struct dn_scp *scp = DN_SK(sk);
1221        int err = -EOPNOTSUPP;
1222        long amount = 0;
1223        struct sk_buff *skb;
1224        int val;
1225
1226        switch(cmd)
1227        {
1228        case SIOCGIFADDR:
1229        case SIOCSIFADDR:
1230                return dn_dev_ioctl(cmd, (void __user *)arg);
1231
1232        case SIOCATMARK:
1233                lock_sock(sk);
1234                val = !skb_queue_empty(&scp->other_receive_queue);
1235                if (scp->state != DN_RUN)
1236                        val = -ENOTCONN;
1237                release_sock(sk);
1238                return val;
1239
1240        case TIOCOUTQ:
1241                amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1242                if (amount < 0)
1243                        amount = 0;
1244                err = put_user(amount, (int __user *)arg);
1245                break;
1246
1247        case TIOCINQ:
1248                lock_sock(sk);
1249                skb = skb_peek(&scp->other_receive_queue);
1250                if (skb) {
1251                        amount = skb->len;
1252                } else {
1253                        skb = sk->sk_receive_queue.next;
1254                        for (;;) {
1255                                if (skb ==
1256                                    (struct sk_buff *)&sk->sk_receive_queue)
1257                                        break;
1258                                amount += skb->len;
1259                                skb = skb->next;
1260                        }
1261                }
1262                release_sock(sk);
1263                err = put_user(amount, (int __user *)arg);
1264                break;
1265
1266        default:
1267                err = -ENOIOCTLCMD;
1268                break;
1269        }
1270
1271        return err;
1272}
1273
1274static int dn_listen(struct socket *sock, int backlog)
1275{
1276        struct sock *sk = sock->sk;
1277        int err = -EINVAL;
1278
1279        lock_sock(sk);
1280
1281        if (sock_flag(sk, SOCK_ZAPPED))
1282                goto out;
1283
1284        if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1285                goto out;
1286
1287        sk->sk_max_ack_backlog = backlog;
1288        sk->sk_ack_backlog     = 0;
1289        sk->sk_state           = TCP_LISTEN;
1290        err                 = 0;
1291        dn_rehash_sock(sk);
1292
1293out:
1294        release_sock(sk);
1295
1296        return err;
1297}
1298
1299
1300static int dn_shutdown(struct socket *sock, int how)
1301{
1302        struct sock *sk = sock->sk;
1303        struct dn_scp *scp = DN_SK(sk);
1304        int err = -ENOTCONN;
1305
1306        lock_sock(sk);
1307
1308        if (sock->state == SS_UNCONNECTED)
1309                goto out;
1310
1311        err = 0;
1312        if (sock->state == SS_DISCONNECTING)
1313                goto out;
1314
1315        err = -EINVAL;
1316        if (scp->state == DN_O)
1317                goto out;
1318
1319        if (how != SHUTDOWN_MASK)
1320                goto out;
1321
1322        sk->sk_shutdown = how;
1323        dn_destroy_sock(sk);
1324        err = 0;
1325
1326out:
1327        release_sock(sk);
1328
1329        return err;
1330}
1331
1332static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1333{
1334        struct sock *sk = sock->sk;
1335        int err;
1336
1337        lock_sock(sk);
1338        err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1339        release_sock(sk);
1340
1341        return err;
1342}
1343
1344static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1345{
1346        struct  sock *sk = sock->sk;
1347        struct dn_scp *scp = DN_SK(sk);
1348        long timeo;
1349        union {
1350                struct optdata_dn opt;
1351                struct accessdata_dn acc;
1352                int mode;
1353                unsigned long win;
1354                int val;
1355                unsigned char services;
1356                unsigned char info;
1357        } u;
1358        int err;
1359
1360        if (optlen && !optval)
1361                return -EINVAL;
1362
1363        if (optlen > sizeof(u))
1364                return -EINVAL;
1365
1366        if (copy_from_user(&u, optval, optlen))
1367                return -EFAULT;
1368
1369        switch(optname) {
1370                case DSO_CONDATA:
1371                        if (sock->state == SS_CONNECTED)
1372                                return -EISCONN;
1373                        if ((scp->state != DN_O) && (scp->state != DN_CR))
1374                                return -EINVAL;
1375
1376                        if (optlen != sizeof(struct optdata_dn))
1377                                return -EINVAL;
1378
1379                        if (le16_to_cpu(u.opt.opt_optl) > 16)
1380                                return -EINVAL;
1381
1382                        memcpy(&scp->conndata_out, &u.opt, optlen);
1383                        break;
1384
1385                case DSO_DISDATA:
1386                        if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1387                                return -ENOTCONN;
1388
1389                        if (optlen != sizeof(struct optdata_dn))
1390                                return -EINVAL;
1391
1392                        if (le16_to_cpu(u.opt.opt_optl) > 16)
1393                                return -EINVAL;
1394
1395                        memcpy(&scp->discdata_out, &u.opt, optlen);
1396                        break;
1397
1398                case DSO_CONACCESS:
1399                        if (sock->state == SS_CONNECTED)
1400                                return -EISCONN;
1401                        if (scp->state != DN_O)
1402                                return -EINVAL;
1403
1404                        if (optlen != sizeof(struct accessdata_dn))
1405                                return -EINVAL;
1406
1407                        if ((u.acc.acc_accl > DN_MAXACCL) ||
1408                                        (u.acc.acc_passl > DN_MAXACCL) ||
1409                                        (u.acc.acc_userl > DN_MAXACCL))
1410                                return -EINVAL;
1411
1412                        memcpy(&scp->accessdata, &u.acc, optlen);
1413                        break;
1414
1415                case DSO_ACCEPTMODE:
1416                        if (sock->state == SS_CONNECTED)
1417                                return -EISCONN;
1418                        if (scp->state != DN_O)
1419                                return -EINVAL;
1420
1421                        if (optlen != sizeof(int))
1422                                return -EINVAL;
1423
1424                        if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1425                                return -EINVAL;
1426
1427                        scp->accept_mode = (unsigned char)u.mode;
1428                        break;
1429
1430                case DSO_CONACCEPT:
1431
1432                        if (scp->state != DN_CR)
1433                                return -EINVAL;
1434                        timeo = sock_rcvtimeo(sk, 0);
1435                        err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1436                        return err;
1437
1438                case DSO_CONREJECT:
1439
1440                        if (scp->state != DN_CR)
1441                                return -EINVAL;
1442
1443                        scp->state = DN_DR;
1444                        sk->sk_shutdown = SHUTDOWN_MASK;
1445                        dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1446                        break;
1447
1448                default:
1449#ifdef CONFIG_NETFILTER
1450                return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1451#endif
1452                case DSO_LINKINFO:
1453                case DSO_STREAM:
1454                case DSO_SEQPACKET:
1455                        return -ENOPROTOOPT;
1456
1457                case DSO_MAXWINDOW:
1458                        if (optlen != sizeof(unsigned long))
1459                                return -EINVAL;
1460                        if (u.win > NSP_MAX_WINDOW)
1461                                u.win = NSP_MAX_WINDOW;
1462                        if (u.win == 0)
1463                                return -EINVAL;
1464                        scp->max_window = u.win;
1465                        if (scp->snd_window > u.win)
1466                                scp->snd_window = u.win;
1467                        break;
1468
1469                case DSO_NODELAY:
1470                        if (optlen != sizeof(int))
1471                                return -EINVAL;
1472                        if (scp->nonagle == 2)
1473                                return -EINVAL;
1474                        scp->nonagle = (u.val == 0) ? 0 : 1;
1475                        /* if (scp->nonagle == 1) { Push pending frames } */
1476                        break;
1477
1478                case DSO_CORK:
1479                        if (optlen != sizeof(int))
1480                                return -EINVAL;
1481                        if (scp->nonagle == 1)
1482                                return -EINVAL;
1483                        scp->nonagle = (u.val == 0) ? 0 : 2;
1484                        /* if (scp->nonagle == 0) { Push pending frames } */
1485                        break;
1486
1487                case DSO_SERVICES:
1488                        if (optlen != sizeof(unsigned char))
1489                                return -EINVAL;
1490                        if ((u.services & ~NSP_FC_MASK) != 0x01)
1491                                return -EINVAL;
1492                        if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1493                                return -EINVAL;
1494                        scp->services_loc = u.services;
1495                        break;
1496
1497                case DSO_INFO:
1498                        if (optlen != sizeof(unsigned char))
1499                                return -EINVAL;
1500                        if (u.info & 0xfc)
1501                                return -EINVAL;
1502                        scp->info_loc = u.info;
1503                        break;
1504        }
1505
1506        return 0;
1507}
1508
1509static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1510{
1511        struct sock *sk = sock->sk;
1512        int err;
1513
1514        lock_sock(sk);
1515        err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1516        release_sock(sk);
1517
1518        return err;
1519}
1520
1521static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1522{
1523        struct  sock *sk = sock->sk;
1524        struct dn_scp *scp = DN_SK(sk);
1525        struct linkinfo_dn link;
1526        unsigned int r_len;
1527        void *r_data = NULL;
1528        unsigned int val;
1529
1530        if(get_user(r_len , optlen))
1531                return -EFAULT;
1532
1533        switch(optname) {
1534                case DSO_CONDATA:
1535                        if (r_len > sizeof(struct optdata_dn))
1536                                r_len = sizeof(struct optdata_dn);
1537                        r_data = &scp->conndata_in;
1538                        break;
1539
1540                case DSO_DISDATA:
1541                        if (r_len > sizeof(struct optdata_dn))
1542                                r_len = sizeof(struct optdata_dn);
1543                        r_data = &scp->discdata_in;
1544                        break;
1545
1546                case DSO_CONACCESS:
1547                        if (r_len > sizeof(struct accessdata_dn))
1548                                r_len = sizeof(struct accessdata_dn);
1549                        r_data = &scp->accessdata;
1550                        break;
1551
1552                case DSO_ACCEPTMODE:
1553                        if (r_len > sizeof(unsigned char))
1554                                r_len = sizeof(unsigned char);
1555                        r_data = &scp->accept_mode;
1556                        break;
1557
1558                case DSO_LINKINFO:
1559                        if (r_len > sizeof(struct linkinfo_dn))
1560                                r_len = sizeof(struct linkinfo_dn);
1561
1562                        switch(sock->state) {
1563                                case SS_CONNECTING:
1564                                        link.idn_linkstate = LL_CONNECTING;
1565                                        break;
1566                                case SS_DISCONNECTING:
1567                                        link.idn_linkstate = LL_DISCONNECTING;
1568                                        break;
1569                                case SS_CONNECTED:
1570                                        link.idn_linkstate = LL_RUNNING;
1571                                        break;
1572                                default:
1573                                        link.idn_linkstate = LL_INACTIVE;
1574                        }
1575
1576                        link.idn_segsize = scp->segsize_rem;
1577                        r_data = &link;
1578                        break;
1579
1580                default:
1581#ifdef CONFIG_NETFILTER
1582                {
1583                        int ret, len;
1584
1585                        if(get_user(len, optlen))
1586                                return -EFAULT;
1587
1588                        ret = nf_getsockopt(sk, PF_DECnet, optname,
1589                                                        optval, &len);
1590                        if (ret >= 0)
1591                                ret = put_user(len, optlen);
1592                        return ret;
1593                }
1594#endif
1595                case DSO_STREAM:
1596                case DSO_SEQPACKET:
1597                case DSO_CONACCEPT:
1598                case DSO_CONREJECT:
1599                        return -ENOPROTOOPT;
1600
1601                case DSO_MAXWINDOW:
1602                        if (r_len > sizeof(unsigned long))
1603                                r_len = sizeof(unsigned long);
1604                        r_data = &scp->max_window;
1605                        break;
1606
1607                case DSO_NODELAY:
1608                        if (r_len > sizeof(int))
1609                                r_len = sizeof(int);
1610                        val = (scp->nonagle == 1);
1611                        r_data = &val;
1612                        break;
1613
1614                case DSO_CORK:
1615                        if (r_len > sizeof(int))
1616                                r_len = sizeof(int);
1617                        val = (scp->nonagle == 2);
1618                        r_data = &val;
1619                        break;
1620
1621                case DSO_SERVICES:
1622                        if (r_len > sizeof(unsigned char))
1623                                r_len = sizeof(unsigned char);
1624                        r_data = &scp->services_rem;
1625                        break;
1626
1627                case DSO_INFO:
1628                        if (r_len > sizeof(unsigned char))
1629                                r_len = sizeof(unsigned char);
1630                        r_data = &scp->info_rem;
1631                        break;
1632        }
1633
1634        if (r_data) {
1635                if (copy_to_user(optval, r_data, r_len))
1636                        return -EFAULT;
1637                if (put_user(r_len, optlen))
1638                        return -EFAULT;
1639        }
1640
1641        return 0;
1642}
1643
1644
1645static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1646{
1647        struct sk_buff *skb = q->next;
1648        int len = 0;
1649
1650        if (flags & MSG_OOB)
1651                return !skb_queue_empty(q) ? 1 : 0;
1652
1653        while(skb != (struct sk_buff *)q) {
1654                struct dn_skb_cb *cb = DN_SKB_CB(skb);
1655                len += skb->len;
1656
1657                if (cb->nsp_flags & 0x40) {
1658                        /* SOCK_SEQPACKET reads to EOM */
1659                        if (sk->sk_type == SOCK_SEQPACKET)
1660                                return 1;
1661                        /* so does SOCK_STREAM unless WAITALL is specified */
1662                        if (!(flags & MSG_WAITALL))
1663                                return 1;
1664                }
1665
1666                /* minimum data length for read exceeded */
1667                if (len >= target)
1668                        return 1;
1669
1670                skb = skb->next;
1671        }
1672
1673        return 0;
1674}
1675
1676
1677static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1678        struct msghdr *msg, size_t size, int flags)
1679{
1680        struct sock *sk = sock->sk;
1681        struct dn_scp *scp = DN_SK(sk);
1682        struct sk_buff_head *queue = &sk->sk_receive_queue;
1683        size_t target = size > 1 ? 1 : 0;
1684        size_t copied = 0;
1685        int rv = 0;
1686        struct sk_buff *skb, *nskb;
1687        struct dn_skb_cb *cb = NULL;
1688        unsigned char eor = 0;
1689        long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1690
1691        lock_sock(sk);
1692
1693        if (sock_flag(sk, SOCK_ZAPPED)) {
1694                rv = -EADDRNOTAVAIL;
1695                goto out;
1696        }
1697
1698        if (sk->sk_shutdown & RCV_SHUTDOWN) {
1699                rv = 0;
1700                goto out;
1701        }
1702
1703        rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1704        if (rv)
1705                goto out;
1706
1707        if (flags & ~(MSG_CMSG_COMPAT|MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1708                rv = -EOPNOTSUPP;
1709                goto out;
1710        }
1711
1712        if (flags & MSG_OOB)
1713                queue = &scp->other_receive_queue;
1714
1715        if (flags & MSG_WAITALL)
1716                target = size;
1717
1718
1719        /*
1720         * See if there is data ready to read, sleep if there isn't
1721         */
1722        for(;;) {
1723                DEFINE_WAIT(wait);
1724
1725                if (sk->sk_err)
1726                        goto out;
1727
1728                if (!skb_queue_empty(&scp->other_receive_queue)) {
1729                        if (!(flags & MSG_OOB)) {
1730                                msg->msg_flags |= MSG_OOB;
1731                                if (!scp->other_report) {
1732                                        scp->other_report = 1;
1733                                        goto out;
1734                                }
1735                        }
1736                }
1737
1738                if (scp->state != DN_RUN)
1739                        goto out;
1740
1741                if (signal_pending(current)) {
1742                        rv = sock_intr_errno(timeo);
1743                        goto out;
1744                }
1745
1746                if (dn_data_ready(sk, queue, flags, target))
1747                        break;
1748
1749                if (flags & MSG_DONTWAIT) {
1750                        rv = -EWOULDBLOCK;
1751                        goto out;
1752                }
1753
1754                prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1755                set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1756                sk_wait_event(sk, &timeo, dn_data_ready(sk, queue, flags, target));
1757                clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1758                finish_wait(sk->sk_sleep, &wait);
1759        }
1760
1761        for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1762                unsigned int chunk = skb->len;
1763                cb = DN_SKB_CB(skb);
1764
1765                if ((chunk + copied) > size)
1766                        chunk = size - copied;
1767
1768                if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1769                        rv = -EFAULT;
1770                        break;
1771                }
1772                copied += chunk;
1773
1774                if (!(flags & MSG_PEEK))
1775                        skb_pull(skb, chunk);
1776
1777                eor = cb->nsp_flags & 0x40;
1778                nskb = skb->next;
1779
1780                if (skb->len == 0) {
1781                        skb_unlink(skb, queue);
1782                        kfree_skb(skb);
1783                        /*
1784                         * N.B. Don't refer to skb or cb after this point
1785                         * in loop.
1786                         */
1787                        if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1788                                scp->flowloc_sw = DN_SEND;
1789                                dn_nsp_send_link(sk, DN_SEND, 0);
1790                        }
1791                }
1792
1793                if (eor) {
1794                        if (sk->sk_type == SOCK_SEQPACKET)
1795                                break;
1796                        if (!(flags & MSG_WAITALL))
1797                                break;
1798                }
1799
1800                if (flags & MSG_OOB)
1801                        break;
1802
1803                if (copied >= target)
1804                        break;
1805        }
1806
1807        rv = copied;
1808
1809
1810        if (eor && (sk->sk_type == SOCK_SEQPACKET))
1811                msg->msg_flags |= MSG_EOR;
1812
1813out:
1814        if (rv == 0)
1815                rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1816
1817        if ((rv >= 0) && msg->msg_name) {
1818                memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1819                msg->msg_namelen = sizeof(struct sockaddr_dn);
1820        }
1821
1822        release_sock(sk);
1823
1824        return rv;
1825}
1826
1827
1828static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1829{
1830        unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1831        if (skb_queue_len(queue) >= scp->snd_window)
1832                return 1;
1833        if (fctype != NSP_FC_NONE) {
1834                if (flags & MSG_OOB) {
1835                        if (scp->flowrem_oth == 0)
1836                                return 1;
1837                } else {
1838                        if (scp->flowrem_dat == 0)
1839                                return 1;
1840                }
1841        }
1842        return 0;
1843}
1844
1845/*
1846 * The DECnet spec requires that the "routing layer" accepts packets which
1847 * are at least 230 bytes in size. This excludes any headers which the NSP
1848 * layer might add, so we always assume that we'll be using the maximal
1849 * length header on data packets. The variation in length is due to the
1850 * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1851 * make much practical difference.
1852 */
1853unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1854{
1855        unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1856        if (dev) {
1857                struct dn_dev *dn_db = dev->dn_ptr;
1858                mtu -= LL_RESERVED_SPACE(dev);
1859                if (dn_db->use_long)
1860                        mtu -= 21;
1861                else
1862                        mtu -= 6;
1863                mtu -= DN_MAX_NSP_DATA_HEADER;
1864        } else {
1865                /*
1866                 * 21 = long header, 16 = guess at MAC header length
1867                 */
1868                mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1869        }
1870        if (mtu > mss)
1871                mss = mtu;
1872        return mss;
1873}
1874
1875static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1876{
1877        struct dst_entry *dst = __sk_dst_get(sk);
1878        struct dn_scp *scp = DN_SK(sk);
1879        int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1880
1881        /* Other data messages are limited to 16 bytes per packet */
1882        if (flags & MSG_OOB)
1883                return 16;
1884
1885        /* This works out the maximum size of segment we can send out */
1886        if (dst) {
1887                u32 mtu = dst_mtu(dst);
1888                mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1889        }
1890
1891        return mss_now;
1892}
1893
1894/*
1895 * N.B. We get the timeout wrong here, but then we always did get it
1896 * wrong before and this is another step along the road to correcting
1897 * it. It ought to get updated each time we pass through the routine,
1898 * but in practise it probably doesn't matter too much for now.
1899 */
1900static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1901                              unsigned long datalen, int noblock,
1902                              int *errcode)
1903{
1904        struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1905                                                   noblock, errcode);
1906        if (skb) {
1907                skb->protocol = htons(ETH_P_DNA_RT);
1908                skb->pkt_type = PACKET_OUTGOING;
1909        }
1910        return skb;
1911}
1912
1913static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1914                      struct msghdr *msg, size_t size)
1915{
1916        struct sock *sk = sock->sk;
1917        struct dn_scp *scp = DN_SK(sk);
1918        size_t mss;
1919        struct sk_buff_head *queue = &scp->data_xmit_queue;
1920        int flags = msg->msg_flags;
1921        int err = 0;
1922        size_t sent = 0;
1923        int addr_len = msg->msg_namelen;
1924        struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1925        struct sk_buff *skb = NULL;
1926        struct dn_skb_cb *cb;
1927        size_t len;
1928        unsigned char fctype;
1929        long timeo;
1930
1931        if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1932                return -EOPNOTSUPP;
1933
1934        if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1935                return -EINVAL;
1936
1937        lock_sock(sk);
1938        timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1939        /*
1940         * The only difference between stream sockets and sequenced packet
1941         * sockets is that the stream sockets always behave as if MSG_EOR
1942         * has been set.
1943         */
1944        if (sock->type == SOCK_STREAM) {
1945                if (flags & MSG_EOR) {
1946                        err = -EINVAL;
1947                        goto out;
1948                }
1949                flags |= MSG_EOR;
1950        }
1951
1952
1953        err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1954        if (err)
1955                goto out_err;
1956
1957        if (sk->sk_shutdown & SEND_SHUTDOWN) {
1958                err = -EPIPE;
1959                if (!(flags & MSG_NOSIGNAL))
1960                        send_sig(SIGPIPE, current, 0);
1961                goto out_err;
1962        }
1963
1964        if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1965                dst_negative_advice(&sk->sk_dst_cache);
1966
1967        mss = scp->segsize_rem;
1968        fctype = scp->services_rem & NSP_FC_MASK;
1969
1970        mss = dn_current_mss(sk, flags);
1971
1972        if (flags & MSG_OOB) {
1973                queue = &scp->other_xmit_queue;
1974                if (size > mss) {
1975                        err = -EMSGSIZE;
1976                        goto out;
1977                }
1978        }
1979
1980        scp->persist_fxn = dn_nsp_xmit_timeout;
1981
1982        while(sent < size) {
1983                err = sock_error(sk);
1984                if (err)
1985                        goto out;
1986
1987                if (signal_pending(current)) {
1988                        err = sock_intr_errno(timeo);
1989                        goto out;
1990                }
1991
1992                /*
1993                 * Calculate size that we wish to send.
1994                 */
1995                len = size - sent;
1996
1997                if (len > mss)
1998                        len = mss;
1999
2000                /*
2001                 * Wait for queue size to go down below the window
2002                 * size.
2003                 */
2004                if (dn_queue_too_long(scp, queue, flags)) {
2005                        DEFINE_WAIT(wait);
2006
2007                        if (flags & MSG_DONTWAIT) {
2008                                err = -EWOULDBLOCK;
2009                                goto out;
2010                        }
2011
2012                        prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
2013                        set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2014                        sk_wait_event(sk, &timeo,
2015                                      !dn_queue_too_long(scp, queue, flags));
2016                        clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
2017                        finish_wait(sk->sk_sleep, &wait);
2018                        continue;
2019                }
2020
2021                /*
2022                 * Get a suitably sized skb.
2023                 * 64 is a bit of a hack really, but its larger than any
2024                 * link-layer headers and has served us well as a good
2025                 * guess as to their real length.
2026                 */
2027                skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2028                                         flags & MSG_DONTWAIT, &err);
2029
2030                if (err)
2031                        break;
2032
2033                if (!skb)
2034                        continue;
2035
2036                cb = DN_SKB_CB(skb);
2037
2038                skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2039
2040                if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2041                        err = -EFAULT;
2042                        goto out;
2043                }
2044
2045                if (flags & MSG_OOB) {
2046                        cb->nsp_flags = 0x30;
2047                        if (fctype != NSP_FC_NONE)
2048                                scp->flowrem_oth--;
2049                } else {
2050                        cb->nsp_flags = 0x00;
2051                        if (scp->seg_total == 0)
2052                                cb->nsp_flags |= 0x20;
2053
2054                        scp->seg_total += len;
2055
2056                        if (((sent + len) == size) && (flags & MSG_EOR)) {
2057                                cb->nsp_flags |= 0x40;
2058                                scp->seg_total = 0;
2059                                if (fctype == NSP_FC_SCMC)
2060                                        scp->flowrem_dat--;
2061                        }
2062                        if (fctype == NSP_FC_SRC)
2063                                scp->flowrem_dat--;
2064                }
2065
2066                sent += len;
2067                dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2068                skb = NULL;
2069
2070                scp->persist = dn_nsp_persist(sk);
2071
2072        }
2073out:
2074
2075        kfree_skb(skb);
2076
2077        release_sock(sk);
2078
2079        return sent ? sent : err;
2080
2081out_err:
2082        err = sk_stream_error(sk, flags, err);
2083        release_sock(sk);
2084        return err;
2085}
2086
2087static int dn_device_event(struct notifier_block *this, unsigned long event,
2088                        void *ptr)
2089{
2090        struct net_device *dev = (struct net_device *)ptr;
2091
2092        if (!net_eq(dev_net(dev), &init_net))
2093                return NOTIFY_DONE;
2094
2095        switch(event) {
2096                case NETDEV_UP:
2097                        dn_dev_up(dev);
2098                        break;
2099                case NETDEV_DOWN:
2100                        dn_dev_down(dev);
2101                        break;
2102                default:
2103                        break;
2104        }
2105
2106        return NOTIFY_DONE;
2107}
2108
2109static struct notifier_block dn_dev_notifier = {
2110        .notifier_call = dn_device_event,
2111};
2112
2113extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2114
2115static struct packet_type dn_dix_packet_type __read_mostly = {
2116        .type =         cpu_to_be16(ETH_P_DNA_RT),
2117        .func =         dn_route_rcv,
2118};
2119
2120#ifdef CONFIG_PROC_FS
2121struct dn_iter_state {
2122        int bucket;
2123};
2124
2125static struct sock *dn_socket_get_first(struct seq_file *seq)
2126{
2127        struct dn_iter_state *state = seq->private;
2128        struct sock *n = NULL;
2129
2130        for(state->bucket = 0;
2131            state->bucket < DN_SK_HASH_SIZE;
2132            ++state->bucket) {
2133                n = sk_head(&dn_sk_hash[state->bucket]);
2134                if (n)
2135                        break;
2136        }
2137
2138        return n;
2139}
2140
2141static struct sock *dn_socket_get_next(struct seq_file *seq,
2142                                       struct sock *n)
2143{
2144        struct dn_iter_state *state = seq->private;
2145
2146        n = sk_next(n);
2147try_again:
2148        if (n)
2149                goto out;
2150        if (++state->bucket >= DN_SK_HASH_SIZE)
2151                goto out;
2152        n = sk_head(&dn_sk_hash[state->bucket]);
2153        goto try_again;
2154out:
2155        return n;
2156}
2157
2158static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2159{
2160        struct sock *sk = dn_socket_get_first(seq);
2161
2162        if (sk) {
2163                while(*pos && (sk = dn_socket_get_next(seq, sk)))
2164                        --*pos;
2165        }
2166        return *pos ? NULL : sk;
2167}
2168
2169static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2170{
2171        void *rc;
2172        read_lock_bh(&dn_hash_lock);
2173        rc = socket_get_idx(seq, &pos);
2174        if (!rc) {
2175                read_unlock_bh(&dn_hash_lock);
2176        }
2177        return rc;
2178}
2179
2180static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2181{
2182        return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2183}
2184
2185static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2186{
2187        void *rc;
2188
2189        if (v == SEQ_START_TOKEN) {
2190                rc = dn_socket_get_idx(seq, 0);
2191                goto out;
2192        }
2193
2194        rc = dn_socket_get_next(seq, v);
2195        if (rc)
2196                goto out;
2197        read_unlock_bh(&dn_hash_lock);
2198out:
2199        ++*pos;
2200        return rc;
2201}
2202
2203static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2204{
2205        if (v && v != SEQ_START_TOKEN)
2206                read_unlock_bh(&dn_hash_lock);
2207}
2208
2209#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2210
2211static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2212{
2213        int i;
2214
2215        switch (le16_to_cpu(dn->sdn_objnamel)) {
2216                case 0:
2217                        sprintf(buf, "%d", dn->sdn_objnum);
2218                        break;
2219                default:
2220                        for (i = 0; i < le16_to_cpu(dn->sdn_objnamel); i++) {
2221                                buf[i] = dn->sdn_objname[i];
2222                                if (IS_NOT_PRINTABLE(buf[i]))
2223                                        buf[i] = '.';
2224                        }
2225                        buf[i] = 0;
2226        }
2227}
2228
2229static char *dn_state2asc(unsigned char state)
2230{
2231        switch(state) {
2232                case DN_O:
2233                        return "OPEN";
2234                case DN_CR:
2235                        return "  CR";
2236                case DN_DR:
2237                        return "  DR";
2238                case DN_DRC:
2239                        return " DRC";
2240                case DN_CC:
2241                        return "  CC";
2242                case DN_CI:
2243                        return "  CI";
2244                case DN_NR:
2245                        return "  NR";
2246                case DN_NC:
2247                        return "  NC";
2248                case DN_CD:
2249                        return "  CD";
2250                case DN_RJ:
2251                        return "  RJ";
2252                case DN_RUN:
2253                        return " RUN";
2254                case DN_DI:
2255                        return "  DI";
2256                case DN_DIC:
2257                        return " DIC";
2258                case DN_DN:
2259                        return "  DN";
2260                case DN_CL:
2261                        return "  CL";
2262                case DN_CN:
2263                        return "  CN";
2264        }
2265
2266        return "????";
2267}
2268
2269static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2270{
2271        struct dn_scp *scp = DN_SK(sk);
2272        char buf1[DN_ASCBUF_LEN];
2273        char buf2[DN_ASCBUF_LEN];
2274        char local_object[DN_MAXOBJL+3];
2275        char remote_object[DN_MAXOBJL+3];
2276
2277        dn_printable_object(&scp->addr, local_object);
2278        dn_printable_object(&scp->peer, remote_object);
2279
2280        seq_printf(seq,
2281                   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2282                   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2283                   dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->addr)), buf1),
2284                   scp->addrloc,
2285                   scp->numdat,
2286                   scp->numoth,
2287                   scp->ackxmt_dat,
2288                   scp->ackxmt_oth,
2289                   scp->flowloc_sw,
2290                   local_object,
2291                   dn_addr2asc(le16_to_cpu(dn_saddr2dn(&scp->peer)), buf2),
2292                   scp->addrrem,
2293                   scp->numdat_rcv,
2294                   scp->numoth_rcv,
2295                   scp->ackrcv_dat,
2296                   scp->ackrcv_oth,
2297                   scp->flowrem_sw,
2298                   remote_object,
2299                   dn_state2asc(scp->state),
2300                   ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2301}
2302
2303static int dn_socket_seq_show(struct seq_file *seq, void *v)
2304{
2305        if (v == SEQ_START_TOKEN) {
2306                seq_puts(seq, "Local                                              Remote\n");
2307        } else {
2308                dn_socket_format_entry(seq, v);
2309        }
2310        return 0;
2311}
2312
2313static const struct seq_operations dn_socket_seq_ops = {
2314        .start  = dn_socket_seq_start,
2315        .next   = dn_socket_seq_next,
2316        .stop   = dn_socket_seq_stop,
2317        .show   = dn_socket_seq_show,
2318};
2319
2320static int dn_socket_seq_open(struct inode *inode, struct file *file)
2321{
2322        return seq_open_private(file, &dn_socket_seq_ops,
2323                        sizeof(struct dn_iter_state));
2324}
2325
2326static const struct file_operations dn_socket_seq_fops = {
2327        .owner          = THIS_MODULE,
2328        .open           = dn_socket_seq_open,
2329        .read           = seq_read,
2330        .llseek         = seq_lseek,
2331        .release        = seq_release_private,
2332};
2333#endif
2334
2335static struct net_proto_family  dn_family_ops = {
2336        .family =       AF_DECnet,
2337        .create =       dn_create,
2338        .owner  =       THIS_MODULE,
2339};
2340
2341static const struct proto_ops dn_proto_ops = {
2342        .family =       AF_DECnet,
2343        .owner =        THIS_MODULE,
2344        .release =      dn_release,
2345        .bind =         dn_bind,
2346        .connect =      dn_connect,
2347        .socketpair =   sock_no_socketpair,
2348        .accept =       dn_accept,
2349        .getname =      dn_getname,
2350        .poll =         dn_poll,
2351        .ioctl =        dn_ioctl,
2352        .listen =       dn_listen,
2353        .shutdown =     dn_shutdown,
2354        .setsockopt =   dn_setsockopt,
2355        .getsockopt =   dn_getsockopt,
2356        .sendmsg =      dn_sendmsg,
2357        .recvmsg =      dn_recvmsg,
2358        .mmap =         sock_no_mmap,
2359        .sendpage =     sock_no_sendpage,
2360};
2361
2362void dn_register_sysctl(void);
2363void dn_unregister_sysctl(void);
2364
2365MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2366MODULE_AUTHOR("Linux DECnet Project Team");
2367MODULE_LICENSE("GPL");
2368MODULE_ALIAS_NETPROTO(PF_DECnet);
2369
2370static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2371
2372static int __init decnet_init(void)
2373{
2374        int rc;
2375
2376        printk(banner);
2377
2378        rc = proto_register(&dn_proto, 1);
2379        if (rc != 0)
2380                goto out;
2381
2382        dn_neigh_init();
2383        dn_dev_init();
2384        dn_route_init();
2385        dn_fib_init();
2386
2387        sock_register(&dn_family_ops);
2388        dev_add_pack(&dn_dix_packet_type);
2389        register_netdevice_notifier(&dn_dev_notifier);
2390
2391        proc_net_fops_create(&init_net, "decnet", S_IRUGO, &dn_socket_seq_fops);
2392        dn_register_sysctl();
2393out:
2394        return rc;
2395
2396}
2397module_init(decnet_init);
2398
2399/*
2400 * Prevent DECnet module unloading until its fixed properly.
2401 * Requires an audit of the code to check for memory leaks and
2402 * initialisation problems etc.
2403 */
2404#if 0
2405static void __exit decnet_exit(void)
2406{
2407        sock_unregister(AF_DECnet);
2408        rtnl_unregister_all(PF_DECnet);
2409        dev_remove_pack(&dn_dix_packet_type);
2410
2411        dn_unregister_sysctl();
2412
2413        unregister_netdevice_notifier(&dn_dev_notifier);
2414
2415        dn_route_cleanup();
2416        dn_dev_cleanup();
2417        dn_neigh_cleanup();
2418        dn_fib_cleanup();
2419
2420        proc_net_remove(&init_net, "decnet");
2421
2422        proto_unregister(&dn_proto);
2423}
2424module_exit(decnet_exit);
2425#endif
2426