net/decnet/af_decnet.c

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