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