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 DEFINE_RWLOCK(dn_hash_lock);
 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 static 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 static 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         if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
 582                 dn_unhash_sock(sk);
 583                 sock_put(sk);
 584                 return 1;
 585         }
 586
 587         return 0;
 588 }
 589
 590 static void dn_destroy_sock(struct sock *sk)
 591 {
 592         struct dn_scp *scp = DN_SK(sk);
 593
 594         scp->nsp_rxtshift = 0; /* reset back off */
 595
 596         if (sk->sk_socket) {
 597                 if (sk->sk_socket->state != SS_UNCONNECTED)
 598                         sk->sk_socket->state = SS_DISCONNECTING;
 599         }
 600
 601         sk->sk_state = TCP_CLOSE;
 602
 603         switch(scp->state) {
 604                 case DN_DN:
 605                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 606                                          sk->sk_allocation);
 607                         scp->persist_fxn = dn_destroy_timer;
 608                         scp->persist = dn_nsp_persist(sk);
 609                         break;
 610                 case DN_CR:
 611                         scp->state = DN_DR;
 612                         goto disc_reject;
 613                 case DN_RUN:
 614                         scp->state = DN_DI;
 615                 case DN_DI:
 616                 case DN_DR:
 617 disc_reject:
 618                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 619                 case DN_NC:
 620                 case DN_NR:
 621                 case DN_RJ:
 622                 case DN_DIC:
 623                 case DN_CN:
 624                 case DN_DRC:
 625                 case DN_CI:
 626                 case DN_CD:
 627                         scp->persist_fxn = dn_destroy_timer;
 628                         scp->persist = dn_nsp_persist(sk);
 629                         break;
 630                 default:
 631                         printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 632                 case DN_O:
 633                         dn_stop_slow_timer(sk);
 634
 635                         dn_unhash_sock_bh(sk);
 636                         sock_put(sk);
 637
 638                         break;
 639         }
 640 }
 641
 642 char *dn_addr2asc(dn_address addr, char *buf)
 643 {
 644         unsigned short node, area;
 645
 646         node = addr & 0x03ff;
 647         area = addr >> 10;
 648         sprintf(buf, "%hd.%hd", area, node);
 649
 650         return buf;
 651 }
 652
 653
 654
 655 static int dn_create(struct socket *sock, int protocol)
 656 {
 657         struct sock *sk;
 658
 659         switch(sock->type) {
 660                 case SOCK_SEQPACKET:
 661                         if (protocol != DNPROTO_NSP)
 662                                 return -EPROTONOSUPPORT;
 663                         break;
 664                 case SOCK_STREAM:
 665                         break;
 666                 default:
 667                         return -ESOCKTNOSUPPORT;
 668         }
 669
 670
 671         if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
 672                 return -ENOBUFS;
 673
 674         sk->sk_protocol = protocol;
 675
 676         return 0;
 677 }
 678
 679
 680 static int
 681 dn_release(struct socket *sock)
 682 {
 683         struct sock *sk = sock->sk;
 684
 685         if (sk) {
 686                 sock_orphan(sk);
 687                 sock_hold(sk);
 688                 lock_sock(sk);
 689                 dn_destroy_sock(sk);
 690                 release_sock(sk);
 691                 sock_put(sk);
 692         }
 693
 694         return 0;
 695 }
 696
 697 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 698 {
 699         struct sock *sk = sock->sk;
 700         struct dn_scp *scp = DN_SK(sk);
 701         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 702         struct net_device *dev;
 703         int rv;
 704
 705         if (addr_len != sizeof(struct sockaddr_dn))
 706                 return -EINVAL;
 707
 708         if (saddr->sdn_family != AF_DECnet)
 709                 return -EINVAL;
 710
 711         if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
 712                 return -EINVAL;
 713
 714         if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
 715                 return -EINVAL;
 716
 717         if (saddr->sdn_flags & ~SDF_WILD)
 718                 return -EINVAL;
 719
 720 #if 1
 721         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 722             (saddr->sdn_flags & SDF_WILD)))
 723                 return -EACCES;
 724 #else
 725         /*
 726          * Maybe put the default actions in the default security ops for
 727          * dn_prot_sock ? Would be nice if the capable call would go there
 728          * too.
 729          */
 730         if (security_dn_prot_sock(saddr) &&
 731             !capable(CAP_NET_BIND_SERVICE) ||
 732             saddr->sdn_objnum || (saddr->sdn_flags & SDF_WILD))
 733                 return -EACCES;
 734 #endif
 735
 736
 737         if (!(saddr->sdn_flags & SDF_WILD)) {
 738                 if (dn_ntohs(saddr->sdn_nodeaddrl)) {
 739                         read_lock(&dev_base_lock);
 740                         for(dev = dev_base; dev; dev = dev->next) {
 741                                 if (!dev->dn_ptr)
 742                                         continue;
 743                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
 744                                         break;
 745                         }
 746                         read_unlock(&dev_base_lock);
 747                         if (dev == NULL)
 748                                 return -EADDRNOTAVAIL;
 749                 }
 750         }
 751
 752         rv = -EINVAL;
 753         lock_sock(sk);
 754         if (sk->sk_zapped) {
 755                 memcpy(&scp->addr, saddr, addr_len);
 756                 sk->sk_zapped = 0;
 757
 758                 rv = dn_hash_sock(sk);
 759                 if (rv) {
 760                         sk->sk_zapped = 1;
 761                 }
 762         }
 763         release_sock(sk);
 764
 765         return rv;
 766 }
 767
 768
 769 static int dn_auto_bind(struct socket *sock)
 770 {
 771         struct sock *sk = sock->sk;
 772         struct dn_scp *scp = DN_SK(sk);
 773         int rv;
 774
 775         sk->sk_zapped = 0;
 776
 777         scp->addr.sdn_flags  = 0;
 778         scp->addr.sdn_objnum = 0;
 779
 780         /*
 781          * This stuff is to keep compatibility with Eduardo's
 782          * patch. I hope I can dispense with it shortly...
 783          */
 784         if ((scp->accessdata.acc_accl != 0) &&
 785                 (scp->accessdata.acc_accl <= 12)) {
 786
 787                 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
 788                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
 789
 790                 scp->accessdata.acc_accl = 0;
 791                 memset(scp->accessdata.acc_acc, 0, 40);
 792         }
 793         /* End of compatibility stuff */
 794
 795         scp->addr.sdn_add.a_len = dn_htons(2);
 796         rv = dn_dev_bind_default((dn_address *)scp->addr.sdn_add.a_addr);
 797         if (rv == 0) {
 798                 rv = dn_hash_sock(sk);
 799                 if (rv) {
 800                         sk->sk_zapped = 1;
 801                 }
 802         }
 803
 804         return rv;
 805 }
 806
 807 static int dn_confirm_accept(struct sock *sk, long *timeo, int allocation)
 808 {
 809         struct dn_scp *scp = DN_SK(sk);
 810         DEFINE_WAIT(wait);
 811         int err;
 812
 813         if (scp->state != DN_CR)
 814                 return -EINVAL;
 815
 816         scp->state = DN_CC;
 817         scp->segsize_loc = dst_path_metric(__sk_dst_get(sk), RTAX_ADVMSS);
 818         dn_send_conn_conf(sk, allocation);
 819
 820         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 821         for(;;) {
 822                 release_sock(sk);
 823                 if (scp->state == DN_CC)
 824                         *timeo = schedule_timeout(*timeo);
 825                 lock_sock(sk);
 826                 err = 0;
 827                 if (scp->state == DN_RUN)
 828                         break;
 829                 err = sock_error(sk);
 830                 if (err)
 831                         break;
 832                 err = sock_intr_errno(*timeo);
 833                 if (signal_pending(current))
 834                         break;
 835                 err = -EAGAIN;
 836                 if (!*timeo)
 837                         break;
 838                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 839         }
 840         finish_wait(sk->sk_sleep, &wait);
 841         if (err == 0) {
 842                 sk->sk_socket->state = SS_CONNECTED;
 843         } else if (scp->state != DN_CC) {
 844                 sk->sk_socket->state = SS_UNCONNECTED;
 845         }
 846         return err;
 847 }
 848
 849 static int dn_wait_run(struct sock *sk, long *timeo)
 850 {
 851         struct dn_scp *scp = DN_SK(sk);
 852         DEFINE_WAIT(wait);
 853         int err = 0;
 854
 855         if (scp->state == DN_RUN)
 856                 goto out;
 857
 858         if (!*timeo)
 859                 return -EALREADY;
 860
 861         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 862         for(;;) {
 863                 release_sock(sk);
 864                 if (scp->state == DN_CI || scp->state == DN_CC)
 865                         *timeo = schedule_timeout(*timeo);
 866                 lock_sock(sk);
 867                 err = 0;
 868                 if (scp->state == DN_RUN)
 869                         break;
 870                 err = sock_error(sk);
 871                 if (err)
 872                         break;
 873                 err = sock_intr_errno(*timeo);
 874                 if (signal_pending(current))
 875                         break;
 876                 err = -ETIMEDOUT;
 877                 if (!*timeo)
 878                         break;
 879                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 880         }
 881         finish_wait(sk->sk_sleep, &wait);
 882 out:
 883         if (err == 0) {
 884                 sk->sk_socket->state = SS_CONNECTED;
 885         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 886                 sk->sk_socket->state = SS_UNCONNECTED;
 887         }
 888         return err;
 889 }
 890
 891 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 892 {
 893         struct socket *sock = sk->sk_socket;
 894         struct dn_scp *scp = DN_SK(sk);
 895         int err = -EISCONN;
 896         struct flowi fl;
 897
 898         if (sock->state == SS_CONNECTED)
 899                 goto out;
 900
 901         if (sock->state == SS_CONNECTING) {
 902                 err = 0;
 903                 if (scp->state == DN_RUN) {
 904                         sock->state = SS_CONNECTED;
 905                         goto out;
 906                 }
 907                 err = -ECONNREFUSED;
 908                 if (scp->state != DN_CI && scp->state != DN_CC) {
 909                         sock->state = SS_UNCONNECTED;
 910                         goto out;
 911                 }
 912                 return dn_wait_run(sk, timeo);
 913         }
 914
 915         err = -EINVAL;
 916         if (scp->state != DN_O)
 917                 goto out;
 918
 919         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 920                 goto out;
 921         if (addr->sdn_family != AF_DECnet)
 922                 goto out;
 923         if (addr->sdn_flags & SDF_WILD)
 924                 goto out;
 925
 926         if (sk->sk_zapped) {
 927                 err = dn_auto_bind(sk->sk_socket);
 928                 if (err)
 929                         goto out;
 930         }
 931
 932         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 933
 934         err = -EHOSTUNREACH;
 935         memset(&fl, 0, sizeof(fl));
 936         fl.oif = sk->sk_bound_dev_if;
 937         fl.fld_dst = dn_saddr2dn(&scp->peer);
 938         fl.fld_src = dn_saddr2dn(&scp->addr);
 939         dn_sk_ports_copy(&fl, scp);
 940         fl.proto = DNPROTO_NSP;
 941         if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
 942                 goto out;
 943         sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 944         sock->state = SS_CONNECTING;
 945         scp->state = DN_CI;
 946         scp->segsize_loc = dst_path_metric(sk->sk_dst_cache, RTAX_ADVMSS);
 947
 948         dn_nsp_send_conninit(sk, NSP_CI);
 949         err = -EINPROGRESS;
 950         if (*timeo) {
 951                 err = dn_wait_run(sk, timeo);
 952         }
 953 out:
 954         return err;
 955 }
 956
 957 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 958 {
 959         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 960         struct sock *sk = sock->sk;
 961         int err;
 962         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 963
 964         lock_sock(sk);
 965         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 966         release_sock(sk);
 967
 968         return err;
 969 }
 970
 971 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 972 {
 973         struct dn_scp *scp = DN_SK(sk);
 974
 975         switch(scp->state) {
 976                 case DN_RUN:
 977                         return 0;
 978                 case DN_CR:
 979                         return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 980                 case DN_CI:
 981                 case DN_CC:
 982                         return dn_wait_run(sk, timeo);
 983                 case DN_O:
 984                         return __dn_connect(sk, addr, addrlen, timeo, flags);
 985         }
 986
 987         return -EINVAL;
 988 }
 989
 990
 991 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
 992 {
 993         unsigned char *ptr = skb->data;
 994
 995         acc->acc_userl = *ptr++;
 996         memcpy(&acc->acc_user, ptr, acc->acc_userl);
 997         ptr += acc->acc_userl;
 998
 999         acc->acc_passl = *ptr++;
1000         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1001         ptr += acc->acc_passl;
1002
1003         acc->acc_accl = *ptr++;
1004         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1005
1006         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1007
1008 }
1009
1010 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1011 {
1012         unsigned char *ptr = skb->data;
1013
1014         opt->opt_optl   = *ptr++;
1015         opt->opt_status = 0;
1016         memcpy(opt->opt_data, ptr, opt->opt_optl);
1017         skb_pull(skb, opt->opt_optl + 1);
1018
1019 }
1020
1021 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1022 {
1023         DEFINE_WAIT(wait);
1024         struct sk_buff *skb = NULL;
1025         int err = 0;
1026
1027         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1028         for(;;) {
1029                 release_sock(sk);
1030                 skb = skb_dequeue(&sk->sk_receive_queue);
1031                 if (skb == NULL) {
1032                         *timeo = schedule_timeout(*timeo);
1033                         skb = skb_dequeue(&sk->sk_receive_queue);
1034                 }
1035                 lock_sock(sk);
1036                 if (skb != NULL)
1037                         break;
1038                 err = -EINVAL;
1039                 if (sk->sk_state != TCP_LISTEN)
1040                         break;
1041                 err = sock_intr_errno(*timeo);
1042                 if (signal_pending(current))
1043                         break;
1044                 err = -EAGAIN;
1045                 if (!*timeo)
1046                         break;
1047                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1048         }
1049         finish_wait(sk->sk_sleep, &wait);
1050
1051         return skb == NULL ? ERR_PTR(err) : skb;
1052 }
1053
1054 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1055 {
1056         struct sock *sk = sock->sk, *newsk;
1057         struct sk_buff *skb = NULL;
1058         struct dn_skb_cb *cb;
1059         unsigned char menuver;
1060         int err = 0;
1061         unsigned char type;
1062         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1063
1064         lock_sock(sk);
1065
1066         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1067                 release_sock(sk);
1068                 return -EINVAL;
1069         }
1070
1071         skb = skb_dequeue(&sk->sk_receive_queue);
1072         if (skb == NULL) {
1073                 skb = dn_wait_for_connect(sk, &timeo);
1074                 if (IS_ERR(skb)) {
1075                         release_sock(sk);
1076                         return PTR_ERR(skb);
1077                 }
1078         }
1079
1080         cb = DN_SKB_CB(skb);
1081         sk->sk_ack_backlog--;
1082         newsk = dn_alloc_sock(newsock, sk->sk_allocation);
1083         if (newsk == NULL) {
1084                 release_sock(sk);
1085                 kfree_skb(skb);
1086                 return -ENOBUFS;
1087         }
1088         release_sock(sk);
1089
1090         dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1091         skb->dst = NULL;
1092
1093         DN_SK(newsk)->state        = DN_CR;
1094         DN_SK(newsk)->addrrem      = cb->src_port;
1095         DN_SK(newsk)->services_rem = cb->services;
1096         DN_SK(newsk)->info_rem     = cb->info;
1097         DN_SK(newsk)->segsize_rem  = cb->segsize;
1098         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1099
1100         if (DN_SK(newsk)->segsize_rem < 230)
1101                 DN_SK(newsk)->segsize_rem = 230;
1102
1103         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1104                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1105
1106         newsk->sk_state  = TCP_LISTEN;
1107         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1108
1109         /*
1110          * If we are listening on a wild socket, we don't want
1111          * the newly created socket on the wrong hash queue.
1112          */
1113         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1114
1115         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1116         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1117         *(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1118         *(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1119
1120         menuver = *skb->data;
1121         skb_pull(skb, 1);
1122
1123         if (menuver & DN_MENUVER_ACC)
1124                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1125
1126         if (menuver & DN_MENUVER_USR)
1127                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1128
1129         if (menuver & DN_MENUVER_PRX)
1130                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1131
1132         if (menuver & DN_MENUVER_UIC)
1133                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1134
1135         kfree_skb(skb);
1136
1137         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1138                 sizeof(struct optdata_dn));
1139         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1140                 sizeof(struct optdata_dn));
1141
1142         lock_sock(newsk);
1143         err = dn_hash_sock(newsk);
1144         if (err == 0) {
1145                 newsk->sk_zapped = 0;
1146                 dn_send_conn_ack(newsk);
1147
1148                 /*
1149                  * Here we use sk->sk_allocation since although the conn conf is
1150                  * for the newsk, the context is the old socket.
1151                  */
1152                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1153                         err = dn_confirm_accept(newsk, &timeo,
1154                                                 sk->sk_allocation);
1155         }
1156         release_sock(newsk);
1157         return err;
1158 }
1159
1160
1161 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1162 {
1163         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1164         struct sock *sk = sock->sk;
1165         struct dn_scp *scp = DN_SK(sk);
1166
1167         *uaddr_len = sizeof(struct sockaddr_dn);
1168
1169         lock_sock(sk);
1170
1171         if (peer) {
1172                 if ((sock->state != SS_CONNECTED &&
1173                      sock->state != SS_CONNECTING) &&
1174                     scp->accept_mode == ACC_IMMED)
1175                         return -ENOTCONN;
1176
1177                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1178         } else {
1179                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1180         }
1181
1182         release_sock(sk);
1183
1184         return 0;
1185 }
1186
1187
1188 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1189 {
1190         struct sock *sk = sock->sk;
1191         struct dn_scp *scp = DN_SK(sk);
1192         int mask = datagram_poll(file, sock, wait);
1193
1194         if (skb_queue_len(&scp->other_receive_queue))
1195                 mask |= POLLRDBAND;
1196
1197         return mask;
1198 }
1199
1200 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1201 {
1202         struct sock *sk = sock->sk;
1203         struct dn_scp *scp = DN_SK(sk);
1204         int err = -EOPNOTSUPP;
1205         long amount = 0;
1206         struct sk_buff *skb;
1207         int val;
1208
1209         switch(cmd)
1210         {
1211         case SIOCGIFADDR:
1212         case SIOCSIFADDR:
1213                 return dn_dev_ioctl(cmd, (void __user *)arg);
1214
1215         case SIOCATMARK:
1216                 lock_sock(sk);
1217                 val = (skb_queue_len(&scp->other_receive_queue) != 0);
1218                 if (scp->state != DN_RUN)
1219                         val = -ENOTCONN;
1220                 release_sock(sk);
1221                 return val;
1222
1223         case TIOCOUTQ:
1224                 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1225                 if (amount < 0)
1226                         amount = 0;
1227                 err = put_user(amount, (int __user *)arg);
1228                 break;
1229
1230         case TIOCINQ:
1231                 lock_sock(sk);
1232                 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1233                         amount = skb->len;
1234                 } else {
1235                         struct sk_buff *skb = sk->sk_receive_queue.next;
1236                         for(;;) {
1237                                 if (skb ==
1238                                     (struct sk_buff *)&sk->sk_receive_queue)
1239                                         break;
1240                                 amount += skb->len;
1241                                 skb = skb->next;
1242                         }
1243                 }
1244                 release_sock(sk);
1245                 err = put_user(amount, (int __user *)arg);
1246                 break;
1247
1248         default:
1249                 err = dev_ioctl(cmd, (void __user *)arg);
1250                 break;
1251         }
1252
1253         return err;
1254 }
1255
1256 static int dn_listen(struct socket *sock, int backlog)
1257 {
1258         struct sock *sk = sock->sk;
1259         int err = -EINVAL;
1260
1261         lock_sock(sk);
1262
1263         if (sk->sk_zapped)
1264                 goto out;
1265
1266         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1267                 goto out;
1268
1269         sk->sk_max_ack_backlog = backlog;
1270         sk->sk_ack_backlog     = 0;
1271         sk->sk_state           = TCP_LISTEN;
1272         err                 = 0;
1273         dn_rehash_sock(sk);
1274
1275 out:
1276         release_sock(sk);
1277
1278         return err;
1279 }
1280
1281
1282 static int dn_shutdown(struct socket *sock, int how)
1283 {
1284         struct sock *sk = sock->sk;
1285         struct dn_scp *scp = DN_SK(sk);
1286         int err = -ENOTCONN;
1287
1288         lock_sock(sk);
1289
1290         if (sock->state == SS_UNCONNECTED)
1291                 goto out;
1292
1293         err = 0;
1294         if (sock->state == SS_DISCONNECTING)
1295                 goto out;
1296
1297         err = -EINVAL;
1298         if (scp->state == DN_O)
1299                 goto out;
1300
1301         if (how != SHUTDOWN_MASK)
1302                 goto out;
1303
1304         sk->sk_shutdown = how;
1305         dn_destroy_sock(sk);
1306         err = 0;
1307
1308 out:
1309         release_sock(sk);
1310
1311         return err;
1312 }
1313
1314 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1315 {
1316         struct sock *sk = sock->sk;
1317         int err;
1318
1319         lock_sock(sk);
1320         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1321         release_sock(sk);
1322
1323         return err;
1324 }
1325
1326 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1327 {
1328         struct  sock *sk = sock->sk;
1329         struct dn_scp *scp = DN_SK(sk);
1330         long timeo;
1331         union {
1332                 struct optdata_dn opt;
1333                 struct accessdata_dn acc;
1334                 int mode;
1335                 unsigned long win;
1336                 int val;
1337                 unsigned char services;
1338                 unsigned char info;
1339         } u;
1340         int err;
1341
1342         if (optlen && !optval)
1343                 return -EINVAL;
1344
1345         if (optlen > sizeof(u))
1346                 return -EINVAL;
1347
1348         if (copy_from_user(&u, optval, optlen))
1349                 return -EFAULT;
1350
1351         switch(optname) {
1352                 case DSO_CONDATA:
1353                         if (sock->state == SS_CONNECTED)
1354                                 return -EISCONN;
1355                         if ((scp->state != DN_O) && (scp->state != DN_CR))
1356                                 return -EINVAL;
1357
1358                         if (optlen != sizeof(struct optdata_dn))
1359                                 return -EINVAL;
1360
1361                         if (u.opt.opt_optl > 16)
1362                                 return -EINVAL;
1363
1364                         memcpy(&scp->conndata_out, &u.opt, optlen);
1365                         break;
1366
1367                 case DSO_DISDATA:
1368                         if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1369                                 return -ENOTCONN;
1370
1371                         if (optlen != sizeof(struct optdata_dn))
1372                                 return -EINVAL;
1373
1374                         if (u.opt.opt_optl > 16)
1375                                 return -EINVAL;
1376
1377                         memcpy(&scp->discdata_out, &u.opt, optlen);
1378                         break;
1379
1380                 case DSO_CONACCESS:
1381                         if (sock->state == SS_CONNECTED)
1382                                 return -EISCONN;
1383                         if (scp->state != DN_O)
1384                                 return -EINVAL;
1385
1386                         if (optlen != sizeof(struct accessdata_dn))
1387                                 return -EINVAL;
1388
1389                         if ((u.acc.acc_accl > DN_MAXACCL) ||
1390                                         (u.acc.acc_passl > DN_MAXACCL) ||
1391                                         (u.acc.acc_userl > DN_MAXACCL))
1392                                 return -EINVAL;
1393
1394                         memcpy(&scp->accessdata, &u.acc, optlen);
1395                         break;
1396
1397                 case DSO_ACCEPTMODE:
1398                         if (sock->state == SS_CONNECTED)
1399                                 return -EISCONN;
1400                         if (scp->state != DN_O)
1401                                 return -EINVAL;
1402
1403                         if (optlen != sizeof(int))
1404                                 return -EINVAL;
1405
1406                         if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1407                                 return -EINVAL;
1408
1409                         scp->accept_mode = (unsigned char)u.mode;
1410                         break;
1411
1412                 case DSO_CONACCEPT:
1413
1414                         if (scp->state != DN_CR)
1415                                 return -EINVAL;
1416                         timeo = sock_rcvtimeo(sk, 0);
1417                         err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1418                         return err;
1419
1420                 case DSO_CONREJECT:
1421
1422                         if (scp->state != DN_CR)
1423                                 return -EINVAL;
1424
1425                         scp->state = DN_DR;
1426                         sk->sk_shutdown = SHUTDOWN_MASK;
1427                         dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1428                         break;
1429
1430                 default:
1431 #ifdef CONFIG_NETFILTER
1432                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1433 #endif
1434                 case DSO_LINKINFO:
1435                 case DSO_STREAM:
1436                 case DSO_SEQPACKET:
1437                         return -ENOPROTOOPT;
1438
1439                 case DSO_MAXWINDOW:
1440                         if (optlen != sizeof(unsigned long))
1441                                 return -EINVAL;
1442                         if (u.win > NSP_MAX_WINDOW)
1443                                 u.win = NSP_MAX_WINDOW;
1444                         if (u.win == 0)
1445                                 return -EINVAL;
1446                         scp->max_window = u.win;
1447                         if (scp->snd_window > u.win)
1448                                 scp->snd_window = u.win;
1449                         break;
1450
1451                 case DSO_NODELAY:
1452                         if (optlen != sizeof(int))
1453                                 return -EINVAL;
1454                         if (scp->nonagle == 2)
1455                                 return -EINVAL;
1456                         scp->nonagle = (u.val == 0) ? 0 : 1;
1457                         /* if (scp->nonagle == 1) { Push pending frames } */
1458                         break;
1459
1460                 case DSO_CORK:
1461                         if (optlen != sizeof(int))
1462                                 return -EINVAL;
1463                         if (scp->nonagle == 1)
1464                                 return -EINVAL;
1465                         scp->nonagle = (u.val == 0) ? 0 : 2;
1466                         /* if (scp->nonagle == 0) { Push pending frames } */
1467                         break;
1468
1469                 case DSO_SERVICES:
1470                         if (optlen != sizeof(unsigned char))
1471                                 return -EINVAL;
1472                         if ((u.services & ~NSP_FC_MASK) != 0x01)
1473                                 return -EINVAL;
1474                         if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1475                                 return -EINVAL;
1476                         scp->services_loc = u.services;
1477                         break;
1478
1479                 case DSO_INFO:
1480                         if (optlen != sizeof(unsigned char))
1481                                 return -EINVAL;
1482                         if (u.info & 0xfc)
1483                                 return -EINVAL;
1484                         scp->info_loc = u.info;
1485                         break;
1486         }
1487
1488         return 0;
1489 }
1490
1491 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1492 {
1493         struct sock *sk = sock->sk;
1494         int err;
1495
1496         lock_sock(sk);
1497         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1498         release_sock(sk);
1499
1500         return err;
1501 }
1502
1503 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1504 {
1505         struct  sock *sk = sock->sk;
1506         struct dn_scp *scp = DN_SK(sk);
1507         struct linkinfo_dn link;
1508         unsigned int r_len;
1509         void *r_data = NULL;
1510         unsigned int val;
1511
1512         if(get_user(r_len , optlen))
1513                 return -EFAULT;
1514
1515         switch(optname) {
1516                 case DSO_CONDATA:
1517                         if (r_len > sizeof(struct optdata_dn))
1518                                 r_len = sizeof(struct optdata_dn);
1519                         r_data = &scp->conndata_in;
1520                         break;
1521
1522                 case DSO_DISDATA:
1523                         if (r_len > sizeof(struct optdata_dn))
1524                                 r_len = sizeof(struct optdata_dn);
1525                         r_data = &scp->discdata_in;
1526                         break;
1527
1528                 case DSO_CONACCESS:
1529                         if (r_len > sizeof(struct accessdata_dn))
1530                                 r_len = sizeof(struct accessdata_dn);
1531                         r_data = &scp->accessdata;
1532                         break;
1533
1534                 case DSO_ACCEPTMODE:
1535                         if (r_len > sizeof(unsigned char))
1536                                 r_len = sizeof(unsigned char);
1537                         r_data = &scp->accept_mode;
1538                         break;
1539
1540                 case DSO_LINKINFO:
1541                         if (r_len > sizeof(struct linkinfo_dn))
1542                                 r_len = sizeof(struct linkinfo_dn);
1543
1544                         switch(sock->state) {
1545                                 case SS_CONNECTING:
1546                                         link.idn_linkstate = LL_CONNECTING;
1547                                         break;
1548                                 case SS_DISCONNECTING:
1549                                         link.idn_linkstate = LL_DISCONNECTING;
1550                                         break;
1551                                 case SS_CONNECTED:
1552                                         link.idn_linkstate = LL_RUNNING;
1553                                         break;
1554                                 default:
1555                                         link.idn_linkstate = LL_INACTIVE;
1556                         }
1557
1558                         link.idn_segsize = scp->segsize_rem;
1559                         r_data = &link;
1560                         break;
1561
1562                 default:
1563 #ifdef CONFIG_NETFILTER
1564                 {
1565                         int val, len;
1566
1567                         if(get_user(len, optlen))
1568                                 return -EFAULT;
1569
1570                         val = nf_getsockopt(sk, PF_DECnet, optname,
1571                                                         optval, &len);
1572                         if (val >= 0)
1573                                 val = put_user(len, optlen);
1574                         return val;
1575                 }
1576 #endif
1577                 case DSO_STREAM:
1578                 case DSO_SEQPACKET:
1579                 case DSO_CONACCEPT:
1580                 case DSO_CONREJECT:
1581                         return -ENOPROTOOPT;
1582
1583                 case DSO_MAXWINDOW:
1584                         if (r_len > sizeof(unsigned long))
1585                                 r_len = sizeof(unsigned long);
1586                         r_data = &scp->max_window;
1587                         break;
1588
1589                 case DSO_NODELAY:
1590                         if (r_len > sizeof(int))
1591                                 r_len = sizeof(int);
1592                         val = (scp->nonagle == 1);
1593                         r_data = &val;
1594                         break;
1595
1596                 case DSO_CORK:
1597                         if (r_len > sizeof(int))
1598                                 r_len = sizeof(int);
1599                         val = (scp->nonagle == 2);
1600                         r_data = &val;
1601                         break;
1602
1603                 case DSO_SERVICES:
1604                         if (r_len > sizeof(unsigned char))
1605                                 r_len = sizeof(unsigned char);
1606                         r_data = &scp->services_rem;
1607                         break;
1608
1609                 case DSO_INFO:
1610                         if (r_len > sizeof(unsigned char))
1611                                 r_len = sizeof(unsigned char);
1612                         r_data = &scp->info_rem;
1613                         break;
1614         }
1615
1616         if (r_data) {
1617                 if (copy_to_user(optval, r_data, r_len))
1618                         return -EFAULT;
1619                 if (put_user(r_len, optlen))
1620                         return -EFAULT;
1621         }
1622
1623         return 0;
1624 }
1625
1626
1627 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1628 {
1629         struct sk_buff *skb = q->next;
1630         int len = 0;
1631
1632         if (flags & MSG_OOB)
1633                 return skb_queue_len(q) ? 1 : 0;
1634
1635         while(skb != (struct sk_buff *)q) {
1636                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1637                 len += skb->len;
1638
1639                 if (cb->nsp_flags & 0x40) {
1640                         /* SOCK_SEQPACKET reads to EOM */
1641                         if (sk->sk_type == SOCK_SEQPACKET)
1642                                 return 1;
1643                         /* so does SOCK_STREAM unless WAITALL is specified */
1644                         if (!(flags & MSG_WAITALL))
1645                                 return 1;
1646                 }
1647
1648                 /* minimum data length for read exceeded */
1649                 if (len >= target)
1650                         return 1;
1651
1652                 skb = skb->next;
1653         }
1654
1655         return 0;
1656 }
1657
1658
1659 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1660         struct msghdr *msg, size_t size, int flags)
1661 {
1662         struct sock *sk = sock->sk;
1663         struct dn_scp *scp = DN_SK(sk);
1664         struct sk_buff_head *queue = &sk->sk_receive_queue;
1665         size_t target = size > 1 ? 1 : 0;
1666         size_t copied = 0;
1667         int rv = 0;
1668         struct sk_buff *skb, *nskb;
1669         struct dn_skb_cb *cb = NULL;
1670         unsigned char eor = 0;
1671         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1672
1673         lock_sock(sk);
1674
1675         if (sk->sk_zapped) {
1676                 rv = -EADDRNOTAVAIL;
1677                 goto out;
1678         }
1679
1680         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1681         if (rv)
1682                 goto out;
1683
1684         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1685                 if (!(flags & MSG_NOSIGNAL))
1686                         send_sig(SIGPIPE, current, 0);
1687                 rv = -EPIPE;
1688                 goto out;
1689         }
1690
1691         if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1692                 rv = -EOPNOTSUPP;
1693                 goto out;
1694         }
1695
1696         if (flags & MSG_OOB)
1697                 queue = &scp->other_receive_queue;
1698
1699         if (flags & MSG_WAITALL)
1700                 target = size;
1701
1702
1703         /*
1704          * See if there is data ready to read, sleep if there isn't
1705          */
1706         for(;;) {
1707                 if (sk->sk_err)
1708                         goto out;
1709
1710                 if (skb_queue_len(&scp->other_receive_queue)) {
1711                         if (!(flags & MSG_OOB)) {
1712                                 msg->msg_flags |= MSG_OOB;
1713                                 if (!scp->other_report) {
1714                                         scp->other_report = 1;
1715                                         goto out;
1716                                 }
1717                         }
1718                 }
1719
1720                 if (scp->state != DN_RUN)
1721                         goto out;
1722
1723                 if (signal_pending(current)) {
1724                         rv = sock_intr_errno(timeo);
1725                         goto out;
1726                 }
1727
1728                 if (dn_data_ready(sk, queue, flags, target))
1729                         break;
1730
1731                 if (flags & MSG_DONTWAIT) {
1732                         rv = -EWOULDBLOCK;
1733                         goto out;
1734                 }
1735
1736                 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1737                 SOCK_SLEEP_PRE(sk)
1738
1739                 if (!dn_data_ready(sk, queue, flags, target))
1740                         schedule();
1741
1742                 SOCK_SLEEP_POST(sk)
1743                 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1744         }
1745
1746         for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1747                 unsigned int chunk = skb->len;
1748                 cb = DN_SKB_CB(skb);
1749
1750                 if ((chunk + copied) > size)
1751                         chunk = size - copied;
1752
1753                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1754                         rv = -EFAULT;
1755                         break;
1756                 }
1757                 copied += chunk;
1758
1759                 if (!(flags & MSG_PEEK))
1760                         skb_pull(skb, chunk);
1761
1762                 eor = cb->nsp_flags & 0x40;
1763                 nskb = skb->next;
1764
1765                 if (skb->len == 0) {
1766                         skb_unlink(skb);
1767                         kfree_skb(skb);
1768                         /*
1769                          * N.B. Don't refer to skb or cb after this point
1770                          * in loop.
1771                          */
1772                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1773                                 scp->flowloc_sw = DN_SEND;
1774                                 dn_nsp_send_link(sk, DN_SEND, 0);
1775                         }
1776                 }
1777
1778                 if (eor) {
1779                         if (sk->sk_type == SOCK_SEQPACKET)
1780                                 break;
1781                         if (!(flags & MSG_WAITALL))
1782                                 break;
1783                 }
1784
1785                 if (flags & MSG_OOB)
1786                         break;
1787
1788                 if (copied >= target)
1789                         break;
1790         }
1791
1792         rv = copied;
1793
1794
1795         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1796                 msg->msg_flags |= MSG_EOR;
1797
1798 out:
1799         if (rv == 0)
1800                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1801
1802         if ((rv >= 0) && msg->msg_name) {
1803                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1804                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1805         }
1806
1807         release_sock(sk);
1808
1809         return rv;
1810 }
1811
1812
1813 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1814 {
1815         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1816         if (skb_queue_len(queue) >= scp->snd_window)
1817                 return 1;
1818         if (fctype != NSP_FC_NONE) {
1819                 if (flags & MSG_OOB) {
1820                         if (scp->flowrem_oth == 0)
1821                                 return 1;
1822                 } else {
1823                         if (scp->flowrem_dat == 0)
1824                                 return 1;
1825                 }
1826         }
1827         return 0;
1828 }
1829
1830 /*
1831  * The DECnet spec requires the the "routing layer" accepts packets which
1832  * are at least 230 bytes in size. This excludes any headers which the NSP
1833  * layer might add, so we always assume that we'll be using the maximal
1834  * length header on data packets. The variation in length is due to the
1835  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1836  * make much practical difference.
1837  */
1838 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1839 {
1840         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1841         if (dev) {
1842                 struct dn_dev *dn_db = dev->dn_ptr;
1843                 mtu -= LL_RESERVED_SPACE(dev);
1844                 if (dn_db->use_long)
1845                         mtu -= 21;
1846                 else
1847                         mtu -= 6;
1848                 mtu -= DN_MAX_NSP_DATA_HEADER;
1849         } else {
1850                 /*
1851                  * 21 = long header, 16 = guess at MAC header length
1852                  */
1853                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1854         }
1855         if (mtu > mss)
1856                 mss = mtu;
1857         return mss;
1858 }
1859
1860 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1861 {
1862         struct dst_entry *dst = __sk_dst_get(sk);
1863         struct dn_scp *scp = DN_SK(sk);
1864         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1865
1866         /* Other data messages are limited to 16 bytes per packet */
1867         if (flags & MSG_OOB)
1868                 return 16;
1869
1870         /* This works out the maximum size of segment we can send out */
1871         if (dst) {
1872                 u32 mtu = dst_pmtu(dst);
1873                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1874         }
1875
1876         return mss_now;
1877 }
1878
1879 static int dn_error(struct sock *sk, int flags, int err)
1880 {
1881         if (err == -EPIPE)
1882                 err = sock_error(sk) ? : -EPIPE;
1883         if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1884                 send_sig(SIGPIPE, current, 0);
1885         return err;
1886 }
1887
1888 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1889            struct msghdr *msg, size_t size)
1890 {
1891         struct sock *sk = sock->sk;
1892         struct dn_scp *scp = DN_SK(sk);
1893         size_t mss;
1894         struct sk_buff_head *queue = &scp->data_xmit_queue;
1895         int flags = msg->msg_flags;
1896         int err = 0;
1897         size_t sent = 0;
1898         int addr_len = msg->msg_namelen;
1899         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1900         struct sk_buff *skb = NULL;
1901         struct dn_skb_cb *cb;
1902         size_t len;
1903         unsigned char fctype;
1904         long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1905
1906         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1907                 return -EOPNOTSUPP;
1908
1909         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1910                 return -EINVAL;
1911
1912         /*
1913          * The only difference between stream sockets and sequenced packet
1914          * sockets is that the stream sockets always behave as if MSG_EOR
1915          * has been set.
1916          */
1917         if (sock->type == SOCK_STREAM) {
1918                 if (flags & MSG_EOR)
1919                         return -EINVAL;
1920                 flags |= MSG_EOR;
1921         }
1922
1923         lock_sock(sk);
1924
1925         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1926         if (err)
1927                 goto out_err;
1928
1929         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1930                 err = -EPIPE;
1931                 goto out_err;
1932         }
1933
1934         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1935                 dst_negative_advice(&sk->sk_dst_cache);
1936
1937         mss = scp->segsize_rem;
1938         fctype = scp->services_rem & NSP_FC_MASK;
1939
1940         mss = dn_current_mss(sk, flags);
1941
1942         if (flags & MSG_OOB) {
1943                 queue = &scp->other_xmit_queue;
1944                 if (size > mss) {
1945                         err = -EMSGSIZE;
1946                         goto out;
1947                 }
1948         }
1949
1950         scp->persist_fxn = dn_nsp_xmit_timeout;
1951
1952         while(sent < size) {
1953                 err = sock_error(sk);
1954                 if (err)
1955                         goto out;
1956
1957                 if (signal_pending(current)) {
1958                         err = sock_intr_errno(timeo);
1959                         goto out;
1960                 }
1961
1962                 /*
1963                  * Calculate size that we wish to send.
1964                  */
1965                 len = size - sent;
1966
1967                 if (len > mss)
1968                         len = mss;
1969
1970                 /*
1971                  * Wait for queue size to go down below the window
1972                  * size.
1973                  */
1974                 if (dn_queue_too_long(scp, queue, flags)) {
1975                         if (flags & MSG_DONTWAIT) {
1976                                 err = -EWOULDBLOCK;
1977                                 goto out;
1978                         }
1979
1980                         SOCK_SLEEP_PRE(sk)
1981
1982                         if (dn_queue_too_long(scp, queue, flags))
1983                                 schedule();
1984
1985                         SOCK_SLEEP_POST(sk)
1986
1987                         continue;
1988                 }
1989
1990                 /*
1991                  * Get a suitably sized skb.
1992                  */
1993                 skb = dn_alloc_send_skb(sk, &len, flags & MSG_DONTWAIT, timeo, &err);
1994
1995                 if (err)
1996                         break;
1997
1998                 if (!skb)
1999                         continue;
2000
2001                 cb = DN_SKB_CB(skb);
2002
2003                 skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
2004
2005                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2006                         err = -EFAULT;
2007                         goto out;
2008                 }
2009
2010                 if (flags & MSG_OOB) {
2011                         cb->nsp_flags = 0x30;
2012                         if (fctype != NSP_FC_NONE)
2013                                 scp->flowrem_oth--;
2014                 } else {
2015                         cb->nsp_flags = 0x00;
2016                         if (scp->seg_total == 0)
2017                                 cb->nsp_flags |= 0x20;
2018
2019                         scp->seg_total += len;
2020
2021                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2022                                 cb->nsp_flags |= 0x40;
2023                                 scp->seg_total = 0;
2024                                 if (fctype == NSP_FC_SCMC)
2025                                         scp->flowrem_dat--;
2026                         }
2027                         if (fctype == NSP_FC_SRC)
2028                                 scp->flowrem_dat--;
2029                 }
2030
2031                 sent += len;
2032                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2033                 skb = NULL;
2034
2035                 scp->persist = dn_nsp_persist(sk);
2036
2037         }
2038 out:
2039
2040         if (skb)
2041                 kfree_skb(skb);
2042
2043         release_sock(sk);
2044
2045         return sent ? sent : err;
2046
2047 out_err:
2048         err = dn_error(sk, flags, err);
2049         release_sock(sk);
2050         return err;
2051 }
2052
2053 static int dn_device_event(struct notifier_block *this, unsigned long event,
2054                         void *ptr)
2055 {
2056         struct net_device *dev = (struct net_device *)ptr;
2057
2058         switch(event) {
2059                 case NETDEV_UP:
2060                         dn_dev_up(dev);
2061                         break;
2062                 case NETDEV_DOWN:
2063                         dn_dev_down(dev);
2064                         break;
2065                 default:
2066                         break;
2067         }
2068
2069         return NOTIFY_DONE;
2070 }
2071
2072 static struct notifier_block dn_dev_notifier = {
2073         .notifier_call = dn_device_event,
2074 };
2075
2076 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *);
2077
2078 static struct packet_type dn_dix_packet_type = {
2079         .type =         __constant_htons(ETH_P_DNA_RT),
2080         .dev =          NULL,           /* All devices */
2081         .func =         dn_route_rcv,
2082 };
2083
2084 #ifdef CONFIG_PROC_FS
2085 struct dn_iter_state {
2086         int bucket;
2087 };
2088
2089 static struct sock *dn_socket_get_first(struct seq_file *seq)
2090 {
2091         struct dn_iter_state *state = seq->private;
2092         struct sock *n = NULL;
2093
2094         for(state->bucket = 0;
2095             state->bucket < DN_SK_HASH_SIZE;
2096             ++state->bucket) {
2097                 n = sk_head(&dn_sk_hash[state->bucket]);
2098                 if (n)
2099                         break;
2100         }
2101
2102         return n;
2103 }
2104
2105 static struct sock *dn_socket_get_next(struct seq_file *seq,
2106                                        struct sock *n)
2107 {
2108         struct dn_iter_state *state = seq->private;
2109
2110         n = sk_next(n);
2111 try_again:
2112         if (n)
2113                 goto out;
2114         if (++state->bucket >= DN_SK_HASH_SIZE)
2115                 goto out;
2116         n = sk_head(&dn_sk_hash[state->bucket]);
2117         goto try_again;
2118 out:
2119         return n;
2120 }
2121
2122 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2123 {
2124         struct sock *sk = dn_socket_get_first(seq);
2125
2126         if (sk) {
2127                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2128                         --*pos;
2129         }
2130         return *pos ? NULL : sk;
2131 }
2132
2133 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2134 {
2135         void *rc;
2136         read_lock_bh(&dn_hash_lock);
2137         rc = socket_get_idx(seq, &pos);
2138         if (!rc) {
2139                 read_unlock_bh(&dn_hash_lock);
2140         }
2141         return rc;
2142 }
2143
2144 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2145 {
2146         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2147 }
2148
2149 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2150 {
2151         void *rc;
2152
2153         if (v == SEQ_START_TOKEN) {
2154                 rc = dn_socket_get_idx(seq, 0);
2155                 goto out;
2156         }
2157
2158         rc = dn_socket_get_next(seq, v);
2159         if (rc)
2160                 goto out;
2161         read_unlock_bh(&dn_hash_lock);
2162 out:
2163         ++*pos;
2164         return rc;
2165 }
2166
2167 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2168 {
2169         if (v && v != SEQ_START_TOKEN)
2170                 read_unlock_bh(&dn_hash_lock);
2171 }
2172
2173 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2174
2175 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2176 {
2177         int i;
2178
2179         switch (dn_ntohs(dn->sdn_objnamel)) {
2180                 case 0:
2181                         sprintf(buf, "%d", dn->sdn_objnum);
2182                         break;
2183                 default:
2184                         for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2185                                 buf[i] = dn->sdn_objname[i];
2186                                 if (IS_NOT_PRINTABLE(buf[i]))
2187                                         buf[i] = '.';
2188                         }
2189                         buf[i] = 0;
2190         }
2191 }
2192
2193 static char *dn_state2asc(unsigned char state)
2194 {
2195         switch(state) {
2196                 case DN_O:
2197                         return "OPEN";
2198                 case DN_CR:
2199                         return "  CR";
2200                 case DN_DR:
2201                         return "  DR";
2202                 case DN_DRC:
2203                         return " DRC";
2204                 case DN_CC:
2205                         return "  CC";
2206                 case DN_CI:
2207                         return "  CI";
2208                 case DN_NR:
2209                         return "  NR";
2210                 case DN_NC:
2211                         return "  NC";
2212                 case DN_CD:
2213                         return "  CD";
2214                 case DN_RJ:
2215                         return "  RJ";
2216                 case DN_RUN:
2217                         return " RUN";
2218                 case DN_DI:
2219                         return "  DI";
2220                 case DN_DIC:
2221                         return " DIC";
2222                 case DN_DN:
2223                         return "  DN";
2224                 case DN_CL:
2225                         return "  CL";
2226                 case DN_CN:
2227                         return "  CN";
2228         }
2229
2230         return "????";
2231 }
2232
2233 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2234 {
2235         struct dn_scp *scp = DN_SK(sk);
2236         char buf1[DN_ASCBUF_LEN];
2237         char buf2[DN_ASCBUF_LEN];
2238         char local_object[DN_MAXOBJL+3];
2239         char remote_object[DN_MAXOBJL+3];
2240
2241         dn_printable_object(&scp->addr, local_object);
2242         dn_printable_object(&scp->peer, remote_object);
2243
2244         seq_printf(seq,
2245                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2246                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2247                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2248                    scp->addrloc,
2249                    scp->numdat,
2250                    scp->numoth,
2251                    scp->ackxmt_dat,
2252                    scp->ackxmt_oth,
2253                    scp->flowloc_sw,
2254                    local_object,
2255                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2256                    scp->addrrem,
2257                    scp->numdat_rcv,
2258                    scp->numoth_rcv,
2259                    scp->ackrcv_dat,
2260                    scp->ackrcv_oth,
2261                    scp->flowrem_sw,
2262                    remote_object,
2263                    dn_state2asc(scp->state),
2264                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2265 }
2266
2267 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2268 {
2269         if (v == SEQ_START_TOKEN) {
2270                 seq_puts(seq, "Local                                              Remote\n");
2271         } else {
2272                 dn_socket_format_entry(seq, v);
2273         }
2274         return 0;
2275 }
2276
2277 static struct seq_operations dn_socket_seq_ops = {
2278         .start  = dn_socket_seq_start,
2279         .next   = dn_socket_seq_next,
2280         .stop   = dn_socket_seq_stop,
2281         .show   = dn_socket_seq_show,
2282 };
2283
2284 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2285 {
2286         struct seq_file *seq;
2287         int rc = -ENOMEM;
2288         struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2289
2290         if (!s)
2291                 goto out;
2292
2293         rc = seq_open(file, &dn_socket_seq_ops);
2294         if (rc)
2295                 goto out_kfree;
2296
2297         seq             = file->private_data;
2298         seq->private    = s;
2299         memset(s, 0, sizeof(*s));
2300 out:
2301         return rc;
2302 out_kfree:
2303         kfree(s);
2304         goto out;
2305 }
2306
2307 static struct file_operations dn_socket_seq_fops = {
2308         .owner          = THIS_MODULE,
2309         .open           = dn_socket_seq_open,
2310         .read           = seq_read,
2311         .llseek         = seq_lseek,
2312         .release        = seq_release_private,
2313 };
2314 #endif
2315
2316 static struct net_proto_family  dn_family_ops = {
2317         .family =       AF_DECnet,
2318         .create =       dn_create,
2319         .owner  =       THIS_MODULE,
2320 };
2321
2322 static struct proto_ops dn_proto_ops = {
2323         .family =       AF_DECnet,
2324         .owner =        THIS_MODULE,
2325         .release =      dn_release,
2326         .bind =         dn_bind,
2327         .connect =      dn_connect,
2328         .socketpair =   sock_no_socketpair,
2329         .accept =       dn_accept,
2330         .getname =      dn_getname,
2331         .poll =         dn_poll,
2332         .ioctl =        dn_ioctl,
2333         .listen =       dn_listen,
2334         .shutdown =     dn_shutdown,
2335         .setsockopt =   dn_setsockopt,
2336         .getsockopt =   dn_getsockopt,
2337         .sendmsg =      dn_sendmsg,
2338         .recvmsg =      dn_recvmsg,
2339         .mmap =         sock_no_mmap,
2340         .sendpage =     sock_no_sendpage,
2341 };
2342
2343 void dn_register_sysctl(void);
2344 void dn_unregister_sysctl(void);
2345
2346 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2347 MODULE_AUTHOR("Linux DECnet Project Team");
2348 MODULE_LICENSE("GPL");
2349 MODULE_ALIAS_NETPROTO(PF_DECnet);
2350
2351 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2352
2353 static int __init decnet_init(void)
2354 {
2355         printk(banner);
2356
2357         dn_sk_cachep = kmem_cache_create("decnet_socket_cache",
2358                                          sizeof(struct dn_sock),
2359                                          0, SLAB_HWCACHE_ALIGN,
2360                                          NULL, NULL);
2361         if (!dn_sk_cachep)
2362                 return -ENOMEM;
2363
2364         dn_neigh_init();
2365         dn_dev_init();
2366         dn_route_init();
2367         dn_fib_init();
2368
2369         sock_register(&dn_family_ops);
2370         dev_add_pack(&dn_dix_packet_type);
2371         register_netdevice_notifier(&dn_dev_notifier);
2372
2373         proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
2374         dn_register_sysctl();
2375
2376         return 0;
2377
2378 }
2379 module_init(decnet_init);
2380
2381 /*
2382  * Prevent DECnet module unloading until its fixed properly.
2383  * Requires an audit of the code to check for memory leaks and
2384  * initialisation problems etc.
2385  */
2386 #if 0
2387 static void __exit decnet_exit(void)
2388 {
2389         sock_unregister(AF_DECnet);
2390         dev_remove_pack(&dn_dix_packet_type);
2391
2392         dn_unregister_sysctl();
2393
2394         unregister_netdevice_notifier(&dn_dev_notifier);
2395
2396         dn_route_cleanup();
2397         dn_dev_cleanup();
2398         dn_neigh_cleanup();
2399         dn_fib_cleanup();
2400
2401         proc_net_remove("decnet");
2402
2403         kmem_cache_destroy(dn_sk_cachep);
2404 }
2405 module_exit(decnet_exit);
2406 #endif