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_states.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 struct proto_ops dn_proto_ops;
 153 static DEFINE_RWLOCK(dn_hash_lock);
 154 static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
 155 static struct hlist_head dn_wild_sk;
 156
 157 static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
 158 static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
 159
 160 static struct hlist_head *dn_find_list(struct sock *sk)
 161 {
 162         struct dn_scp *scp = DN_SK(sk);
 163
 164         if (scp->addr.sdn_flags & SDF_WILD)
 165                 return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
 166
 167         return &dn_sk_hash[scp->addrloc & DN_SK_HASH_MASK];
 168 }
 169
 170 /*
 171  * Valid ports are those greater than zero and not already in use.
 172  */
 173 static int check_port(unsigned short port)
 174 {
 175         struct sock *sk;
 176         struct hlist_node *node;
 177
 178         if (port == 0)
 179                 return -1;
 180
 181         sk_for_each(sk, node, &dn_sk_hash[port & DN_SK_HASH_MASK]) {
 182                 struct dn_scp *scp = DN_SK(sk);
 183                 if (scp->addrloc == port)
 184                         return -1;
 185         }
 186         return 0;
 187 }
 188
 189 static unsigned short port_alloc(struct sock *sk)
 190 {
 191         struct dn_scp *scp = DN_SK(sk);
 192 static unsigned short port = 0x2000;
 193         unsigned short i_port = port;
 194
 195         while(check_port(++port) != 0) {
 196                 if (port == i_port)
 197                         return 0;
 198         }
 199
 200         scp->addrloc = port;
 201
 202         return 1;
 203 }
 204
 205 /*
 206  * Since this is only ever called from user
 207  * level, we don't need a write_lock() version
 208  * of this.
 209  */
 210 static int dn_hash_sock(struct sock *sk)
 211 {
 212         struct dn_scp *scp = DN_SK(sk);
 213         struct hlist_head *list;
 214         int rv = -EUSERS;
 215
 216         BUG_ON(sk_hashed(sk));
 217
 218         write_lock_bh(&dn_hash_lock);
 219
 220         if (!scp->addrloc && !port_alloc(sk))
 221                 goto out;
 222
 223         rv = -EADDRINUSE;
 224         if ((list = dn_find_list(sk)) == NULL)
 225                 goto out;
 226
 227         sk_add_node(sk, list);
 228         rv = 0;
 229 out:
 230         write_unlock_bh(&dn_hash_lock);
 231         return rv;
 232 }
 233
 234 static void dn_unhash_sock(struct sock *sk)
 235 {
 236         write_lock(&dn_hash_lock);
 237         sk_del_node_init(sk);
 238         write_unlock(&dn_hash_lock);
 239 }
 240
 241 static void dn_unhash_sock_bh(struct sock *sk)
 242 {
 243         write_lock_bh(&dn_hash_lock);
 244         sk_del_node_init(sk);
 245         write_unlock_bh(&dn_hash_lock);
 246 }
 247
 248 static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
 249 {
 250         int i;
 251         unsigned hash = addr->sdn_objnum;
 252
 253         if (hash == 0) {
 254                 hash = addr->sdn_objnamel;
 255                 for(i = 0; i < dn_ntohs(addr->sdn_objnamel); i++) {
 256                         hash ^= addr->sdn_objname[i];
 257                         hash ^= (hash << 3);
 258                 }
 259         }
 260
 261         return &dn_sk_hash[hash & DN_SK_HASH_MASK];
 262 }
 263
 264 /*
 265  * Called to transform a socket from bound (i.e. with a local address)
 266  * into a listening socket (doesn't need a local port number) and rehashes
 267  * based upon the object name/number.
 268  */
 269 static void dn_rehash_sock(struct sock *sk)
 270 {
 271         struct hlist_head *list;
 272         struct dn_scp *scp = DN_SK(sk);
 273
 274         if (scp->addr.sdn_flags & SDF_WILD)
 275                 return;
 276
 277         write_lock_bh(&dn_hash_lock);
 278         sk_del_node_init(sk);
 279         DN_SK(sk)->addrloc = 0;
 280         list = listen_hash(&DN_SK(sk)->addr);
 281         sk_add_node(sk, list);
 282         write_unlock_bh(&dn_hash_lock);
 283 }
 284
 285 int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
 286 {
 287         int len = 2;
 288
 289         *buf++ = type;
 290
 291         switch(type) {
 292                 case 0:
 293                         *buf++ = sdn->sdn_objnum;
 294                         break;
 295                 case 1:
 296                         *buf++ = 0;
 297                         *buf++ = dn_ntohs(sdn->sdn_objnamel);
 298                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
 299                         len = 3 + dn_ntohs(sdn->sdn_objnamel);
 300                         break;
 301                 case 2:
 302                         memset(buf, 0, 5);
 303                         buf += 5;
 304                         *buf++ = dn_ntohs(sdn->sdn_objnamel);
 305                         memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
 306                         len = 7 + dn_ntohs(sdn->sdn_objnamel);
 307                         break;
 308         }
 309
 310         return len;
 311 }
 312
 313 /*
 314  * On reception of usernames, we handle types 1 and 0 for destination
 315  * addresses only. Types 2 and 4 are used for source addresses, but the
 316  * UIC, GIC are ignored and they are both treated the same way. Type 3
 317  * is never used as I've no idea what its purpose might be or what its
 318  * format is.
 319  */
 320 int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
 321 {
 322         unsigned char type;
 323         int size = len;
 324         int namel = 12;
 325
 326         sdn->sdn_objnum = 0;
 327         sdn->sdn_objnamel = dn_htons(0);
 328         memset(sdn->sdn_objname, 0, DN_MAXOBJL);
 329
 330         if (len < 2)
 331                 return -1;
 332
 333         len -= 2;
 334         *fmt = *data++;
 335         type = *data++;
 336
 337         switch(*fmt) {
 338                 case 0:
 339                         sdn->sdn_objnum = type;
 340                         return 2;
 341                 case 1:
 342                         namel = 16;
 343                         break;
 344                 case 2:
 345                         len  -= 4;
 346                         data += 4;
 347                         break;
 348                 case 4:
 349                         len  -= 8;
 350                         data += 8;
 351                         break;
 352                 default:
 353                         return -1;
 354         }
 355
 356         len -= 1;
 357
 358         if (len < 0)
 359                 return -1;
 360
 361         sdn->sdn_objnamel = dn_htons(*data++);
 362         len -= dn_ntohs(sdn->sdn_objnamel);
 363
 364         if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
 365                 return -1;
 366
 367         memcpy(sdn->sdn_objname, data, dn_ntohs(sdn->sdn_objnamel));
 368
 369         return size - len;
 370 }
 371
 372 struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
 373 {
 374         struct hlist_head *list = listen_hash(addr);
 375         struct hlist_node *node;
 376         struct sock *sk;
 377
 378         read_lock(&dn_hash_lock);
 379         sk_for_each(sk, node, list) {
 380                 struct dn_scp *scp = DN_SK(sk);
 381                 if (sk->sk_state != TCP_LISTEN)
 382                         continue;
 383                 if (scp->addr.sdn_objnum) {
 384                         if (scp->addr.sdn_objnum != addr->sdn_objnum)
 385                                 continue;
 386                 } else {
 387                         if (addr->sdn_objnum)
 388                                 continue;
 389                         if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
 390                                 continue;
 391                         if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
 392                                 continue;
 393                 }
 394                 sock_hold(sk);
 395                 read_unlock(&dn_hash_lock);
 396                 return sk;
 397         }
 398
 399         sk = sk_head(&dn_wild_sk);
 400         if (sk) {
 401                 if (sk->sk_state == TCP_LISTEN)
 402                         sock_hold(sk);
 403                 else
 404                         sk = NULL;
 405         }
 406
 407         read_unlock(&dn_hash_lock);
 408         return sk;
 409 }
 410
 411 struct sock *dn_find_by_skb(struct sk_buff *skb)
 412 {
 413         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 414         struct sock *sk;
 415         struct hlist_node *node;
 416         struct dn_scp *scp;
 417
 418         read_lock(&dn_hash_lock);
 419         sk_for_each(sk, node, &dn_sk_hash[cb->dst_port & DN_SK_HASH_MASK]) {
 420                 scp = DN_SK(sk);
 421                 if (cb->src != dn_saddr2dn(&scp->peer))
 422                         continue;
 423                 if (cb->dst_port != scp->addrloc)
 424                         continue;
 425                 if (scp->addrrem && (cb->src_port != scp->addrrem))
 426                         continue;
 427                 sock_hold(sk);
 428                 goto found;
 429         }
 430         sk = NULL;
 431 found:
 432         read_unlock(&dn_hash_lock);
 433         return sk;
 434 }
 435
 436
 437
 438 static void dn_destruct(struct sock *sk)
 439 {
 440         struct dn_scp *scp = DN_SK(sk);
 441
 442         skb_queue_purge(&scp->data_xmit_queue);
 443         skb_queue_purge(&scp->other_xmit_queue);
 444         skb_queue_purge(&scp->other_receive_queue);
 445
 446         dst_release(xchg(&sk->sk_dst_cache, NULL));
 447 }
 448
 449 static struct proto dn_proto = {
 450         .name     = "DECNET",
 451         .owner    = THIS_MODULE,
 452         .obj_size = sizeof(struct dn_sock),
 453 };
 454
 455 static struct sock *dn_alloc_sock(struct socket *sock, gfp_t gfp)
 456 {
 457         struct dn_scp *scp;
 458         struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
 459
 460         if  (!sk)
 461                 goto out;
 462
 463         if (sock)
 464                 sock->ops = &dn_proto_ops;
 465         sock_init_data(sock, sk);
 466
 467         sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 468         sk->sk_destruct    = dn_destruct;
 469         sk->sk_no_check    = 1;
 470         sk->sk_family      = PF_DECnet;
 471         sk->sk_protocol    = 0;
 472         sk->sk_allocation  = gfp;
 473
 474         /* Initialization of DECnet Session Control Port                */
 475         scp = DN_SK(sk);
 476         scp->state      = DN_O;         /* Open                 */
 477         scp->numdat     = 1;            /* Next data seg to tx  */
 478         scp->numoth     = 1;            /* Next oth data to tx  */
 479         scp->ackxmt_dat = 0;            /* Last data seg ack'ed */
 480         scp->ackxmt_oth = 0;            /* Last oth data ack'ed */
 481         scp->ackrcv_dat = 0;            /* Highest data ack recv*/
 482         scp->ackrcv_oth = 0;            /* Last oth data ack rec*/
 483         scp->flowrem_sw = DN_SEND;
 484         scp->flowloc_sw = DN_SEND;
 485         scp->flowrem_dat = 0;
 486         scp->flowrem_oth = 1;
 487         scp->flowloc_dat = 0;
 488         scp->flowloc_oth = 1;
 489         scp->services_rem = 0;
 490         scp->services_loc = 1 | NSP_FC_NONE;
 491         scp->info_rem = 0;
 492         scp->info_loc = 0x03; /* NSP version 4.1 */
 493         scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 494         scp->nonagle = 0;
 495         scp->multi_ireq = 1;
 496         scp->accept_mode = ACC_IMMED;
 497         scp->addr.sdn_family    = AF_DECnet;
 498         scp->peer.sdn_family    = AF_DECnet;
 499         scp->accessdata.acc_accl = 5;
 500         memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 501
 502         scp->max_window   = NSP_MAX_WINDOW;
 503         scp->snd_window   = NSP_MIN_WINDOW;
 504         scp->nsp_srtt     = NSP_INITIAL_SRTT;
 505         scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 506         scp->nsp_rxtshift = 0;
 507
 508         skb_queue_head_init(&scp->data_xmit_queue);
 509         skb_queue_head_init(&scp->other_xmit_queue);
 510         skb_queue_head_init(&scp->other_receive_queue);
 511
 512         scp->persist = 0;
 513         scp->persist_fxn = NULL;
 514         scp->keepalive = 10 * HZ;
 515         scp->keepalive_fxn = dn_keepalive;
 516
 517         init_timer(&scp->delack_timer);
 518         scp->delack_pending = 0;
 519         scp->delack_fxn = dn_nsp_delayed_ack;
 520
 521         dn_start_slow_timer(sk);
 522 out:
 523         return sk;
 524 }
 525
 526 /*
 527  * Keepalive timer.
 528  * FIXME: Should respond to SO_KEEPALIVE etc.
 529  */
 530 static void dn_keepalive(struct sock *sk)
 531 {
 532         struct dn_scp *scp = DN_SK(sk);
 533
 534         /*
 535          * By checking the other_data transmit queue is empty
 536          * we are double checking that we are not sending too
 537          * many of these keepalive frames.
 538          */
 539         if (skb_queue_empty(&scp->other_xmit_queue))
 540                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 541 }
 542
 543
 544 /*
 545  * Timer for shutdown/destroyed sockets.
 546  * When socket is dead & no packets have been sent for a
 547  * certain amount of time, they are removed by this
 548  * routine. Also takes care of sending out DI & DC
 549  * frames at correct times.
 550  */
 551 int dn_destroy_timer(struct sock *sk)
 552 {
 553         struct dn_scp *scp = DN_SK(sk);
 554
 555         scp->persist = dn_nsp_persist(sk);
 556
 557         switch(scp->state) {
 558                 case DN_DI:
 559                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 560                         if (scp->nsp_rxtshift >= decnet_di_count)
 561                                 scp->state = DN_CN;
 562                         return 0;
 563
 564                 case DN_DR:
 565                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 566                         if (scp->nsp_rxtshift >= decnet_dr_count)
 567                                 scp->state = DN_DRC;
 568                         return 0;
 569
 570                 case DN_DN:
 571                         if (scp->nsp_rxtshift < decnet_dn_count) {
 572                                 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 573                                 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
 574                                 return 0;
 575                         }
 576         }
 577
 578         scp->persist = (HZ * decnet_time_wait);
 579
 580         if (sk->sk_socket)
 581                 return 0;
 582
 583         if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
 584                 dn_unhash_sock(sk);
 585                 sock_put(sk);
 586                 return 1;
 587         }
 588
 589         return 0;
 590 }
 591
 592 static void dn_destroy_sock(struct sock *sk)
 593 {
 594         struct dn_scp *scp = DN_SK(sk);
 595
 596         scp->nsp_rxtshift = 0; /* reset back off */
 597
 598         if (sk->sk_socket) {
 599                 if (sk->sk_socket->state != SS_UNCONNECTED)
 600                         sk->sk_socket->state = SS_DISCONNECTING;
 601         }
 602
 603         sk->sk_state = TCP_CLOSE;
 604
 605         switch(scp->state) {
 606                 case DN_DN:
 607                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 608                                          sk->sk_allocation);
 609                         scp->persist_fxn = dn_destroy_timer;
 610                         scp->persist = dn_nsp_persist(sk);
 611                         break;
 612                 case DN_CR:
 613                         scp->state = DN_DR;
 614                         goto disc_reject;
 615                 case DN_RUN:
 616                         scp->state = DN_DI;
 617                 case DN_DI:
 618                 case DN_DR:
 619 disc_reject:
 620                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 621                 case DN_NC:
 622                 case DN_NR:
 623                 case DN_RJ:
 624                 case DN_DIC:
 625                 case DN_CN:
 626                 case DN_DRC:
 627                 case DN_CI:
 628                 case DN_CD:
 629                         scp->persist_fxn = dn_destroy_timer;
 630                         scp->persist = dn_nsp_persist(sk);
 631                         break;
 632                 default:
 633                         printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 634                 case DN_O:
 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 (sock_flag(sk, SOCK_ZAPPED)) {
 757                 memcpy(&scp->addr, saddr, addr_len);
 758                 sock_reset_flag(sk, SOCK_ZAPPED);
 759
 760                 rv = dn_hash_sock(sk);
 761                 if (rv)
 762                         sock_set_flag(sk, SOCK_ZAPPED);
 763         }
 764         release_sock(sk);
 765
 766         return rv;
 767 }
 768
 769
 770 static int dn_auto_bind(struct socket *sock)
 771 {
 772         struct sock *sk = sock->sk;
 773         struct dn_scp *scp = DN_SK(sk);
 774         int rv;
 775
 776         sock_reset_flag(sk, SOCK_ZAPPED);
 777
 778         scp->addr.sdn_flags  = 0;
 779         scp->addr.sdn_objnum = 0;
 780
 781         /*
 782          * This stuff is to keep compatibility with Eduardo's
 783          * patch. I hope I can dispense with it shortly...
 784          */
 785         if ((scp->accessdata.acc_accl != 0) &&
 786                 (scp->accessdata.acc_accl <= 12)) {
 787
 788                 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
 789                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
 790
 791                 scp->accessdata.acc_accl = 0;
 792                 memset(scp->accessdata.acc_acc, 0, 40);
 793         }
 794         /* End of compatibility stuff */
 795
 796         scp->addr.sdn_add.a_len = dn_htons(2);
 797         rv = dn_dev_bind_default((dn_address *)scp->addr.sdn_add.a_addr);
 798         if (rv == 0) {
 799                 rv = dn_hash_sock(sk);
 800                 if (rv)
 801                         sock_set_flag(sk, SOCK_ZAPPED);
 802         }
 803
 804         return rv;
 805 }
 806
 807 static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t 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_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 (sock_flag(sk, SOCK_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_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                 sock_reset_flag(newsk, SOCK_ZAPPED);
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_empty(&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_empty(&scp->other_receive_queue);
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 (sock_flag(sk, SOCK_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_empty(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 (sock_flag(sk, SOCK_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_empty(&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, queue);
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_mtu(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 /*
1880  * N.B. We get the timeout wrong here, but then we always did get it
1881  * wrong before and this is another step along the road to correcting
1882  * it. It ought to get updated each time we pass through the routine,
1883  * but in practise it probably doesn't matter too much for now.
1884  */
1885 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1886                               unsigned long datalen, int noblock,
1887                               int *errcode)
1888 {
1889         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1890                                                    noblock, errcode);
1891         if (skb) {
1892                 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1893                 skb->pkt_type = PACKET_OUTGOING;
1894         }
1895         return skb;
1896 }
1897
1898 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1899                       struct msghdr *msg, size_t size)
1900 {
1901         struct sock *sk = sock->sk;
1902         struct dn_scp *scp = DN_SK(sk);
1903         size_t mss;
1904         struct sk_buff_head *queue = &scp->data_xmit_queue;
1905         int flags = msg->msg_flags;
1906         int err = 0;
1907         size_t sent = 0;
1908         int addr_len = msg->msg_namelen;
1909         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1910         struct sk_buff *skb = NULL;
1911         struct dn_skb_cb *cb;
1912         size_t len;
1913         unsigned char fctype;
1914         long timeo;
1915
1916         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1917                 return -EOPNOTSUPP;
1918
1919         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1920                 return -EINVAL;
1921
1922         lock_sock(sk);
1923         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1924         /*
1925          * The only difference between stream sockets and sequenced packet
1926          * sockets is that the stream sockets always behave as if MSG_EOR
1927          * has been set.
1928          */
1929         if (sock->type == SOCK_STREAM) {
1930                 if (flags & MSG_EOR) {
1931                         err = -EINVAL;
1932                         goto out;
1933                 }
1934                 flags |= MSG_EOR;
1935         }
1936
1937
1938         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1939         if (err)
1940                 goto out_err;
1941
1942         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1943                 err = -EPIPE;
1944                 goto out_err;
1945         }
1946
1947         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1948                 dst_negative_advice(&sk->sk_dst_cache);
1949
1950         mss = scp->segsize_rem;
1951         fctype = scp->services_rem & NSP_FC_MASK;
1952
1953         mss = dn_current_mss(sk, flags);
1954
1955         if (flags & MSG_OOB) {
1956                 queue = &scp->other_xmit_queue;
1957                 if (size > mss) {
1958                         err = -EMSGSIZE;
1959                         goto out;
1960                 }
1961         }
1962
1963         scp->persist_fxn = dn_nsp_xmit_timeout;
1964
1965         while(sent < size) {
1966                 err = sock_error(sk);
1967                 if (err)
1968                         goto out;
1969
1970                 if (signal_pending(current)) {
1971                         err = sock_intr_errno(timeo);
1972                         goto out;
1973                 }
1974
1975                 /*
1976                  * Calculate size that we wish to send.
1977                  */
1978                 len = size - sent;
1979
1980                 if (len > mss)
1981                         len = mss;
1982
1983                 /*
1984                  * Wait for queue size to go down below the window
1985                  * size.
1986                  */
1987                 if (dn_queue_too_long(scp, queue, flags)) {
1988                         if (flags & MSG_DONTWAIT) {
1989                                 err = -EWOULDBLOCK;
1990                                 goto out;
1991                         }
1992
1993                         SOCK_SLEEP_PRE(sk)
1994
1995                         if (dn_queue_too_long(scp, queue, flags))
1996                                 schedule();
1997
1998                         SOCK_SLEEP_POST(sk)
1999
2000                         continue;
2001                 }
2002
2003                 /*
2004                  * Get a suitably sized skb.
2005                  * 64 is a bit of a hack really, but its larger than any
2006                  * link-layer headers and has served us well as a good
2007                  * guess as to their real length.
2008                  */
2009                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2010                                          flags & MSG_DONTWAIT, &err);
2011
2012                 if (err)
2013                         break;
2014
2015                 if (!skb)
2016                         continue;
2017
2018                 cb = DN_SKB_CB(skb);
2019
2020                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2021
2022                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2023                         err = -EFAULT;
2024                         goto out;
2025                 }
2026
2027                 if (flags & MSG_OOB) {
2028                         cb->nsp_flags = 0x30;
2029                         if (fctype != NSP_FC_NONE)
2030                                 scp->flowrem_oth--;
2031                 } else {
2032                         cb->nsp_flags = 0x00;
2033                         if (scp->seg_total == 0)
2034                                 cb->nsp_flags |= 0x20;
2035
2036                         scp->seg_total += len;
2037
2038                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2039                                 cb->nsp_flags |= 0x40;
2040                                 scp->seg_total = 0;
2041                                 if (fctype == NSP_FC_SCMC)
2042                                         scp->flowrem_dat--;
2043                         }
2044                         if (fctype == NSP_FC_SRC)
2045                                 scp->flowrem_dat--;
2046                 }
2047
2048                 sent += len;
2049                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2050                 skb = NULL;
2051
2052                 scp->persist = dn_nsp_persist(sk);
2053
2054         }
2055 out:
2056
2057         if (skb)
2058                 kfree_skb(skb);
2059
2060         release_sock(sk);
2061
2062         return sent ? sent : err;
2063
2064 out_err:
2065         err = sk_stream_error(sk, flags, err);
2066         release_sock(sk);
2067         return err;
2068 }
2069
2070 static int dn_device_event(struct notifier_block *this, unsigned long event,
2071                         void *ptr)
2072 {
2073         struct net_device *dev = (struct net_device *)ptr;
2074
2075         switch(event) {
2076                 case NETDEV_UP:
2077                         dn_dev_up(dev);
2078                         break;
2079                 case NETDEV_DOWN:
2080                         dn_dev_down(dev);
2081                         break;
2082                 default:
2083                         break;
2084         }
2085
2086         return NOTIFY_DONE;
2087 }
2088
2089 static struct notifier_block dn_dev_notifier = {
2090         .notifier_call = dn_device_event,
2091 };
2092
2093 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2094
2095 static struct packet_type dn_dix_packet_type = {
2096         .type =         __constant_htons(ETH_P_DNA_RT),
2097         .dev =          NULL,           /* All devices */
2098         .func =         dn_route_rcv,
2099 };
2100
2101 #ifdef CONFIG_PROC_FS
2102 struct dn_iter_state {
2103         int bucket;
2104 };
2105
2106 static struct sock *dn_socket_get_first(struct seq_file *seq)
2107 {
2108         struct dn_iter_state *state = seq->private;
2109         struct sock *n = NULL;
2110
2111         for(state->bucket = 0;
2112             state->bucket < DN_SK_HASH_SIZE;
2113             ++state->bucket) {
2114                 n = sk_head(&dn_sk_hash[state->bucket]);
2115                 if (n)
2116                         break;
2117         }
2118
2119         return n;
2120 }
2121
2122 static struct sock *dn_socket_get_next(struct seq_file *seq,
2123                                        struct sock *n)
2124 {
2125         struct dn_iter_state *state = seq->private;
2126
2127         n = sk_next(n);
2128 try_again:
2129         if (n)
2130                 goto out;
2131         if (++state->bucket >= DN_SK_HASH_SIZE)
2132                 goto out;
2133         n = sk_head(&dn_sk_hash[state->bucket]);
2134         goto try_again;
2135 out:
2136         return n;
2137 }
2138
2139 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2140 {
2141         struct sock *sk = dn_socket_get_first(seq);
2142
2143         if (sk) {
2144                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2145                         --*pos;
2146         }
2147         return *pos ? NULL : sk;
2148 }
2149
2150 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2151 {
2152         void *rc;
2153         read_lock_bh(&dn_hash_lock);
2154         rc = socket_get_idx(seq, &pos);
2155         if (!rc) {
2156                 read_unlock_bh(&dn_hash_lock);
2157         }
2158         return rc;
2159 }
2160
2161 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2162 {
2163         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2164 }
2165
2166 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2167 {
2168         void *rc;
2169
2170         if (v == SEQ_START_TOKEN) {
2171                 rc = dn_socket_get_idx(seq, 0);
2172                 goto out;
2173         }
2174
2175         rc = dn_socket_get_next(seq, v);
2176         if (rc)
2177                 goto out;
2178         read_unlock_bh(&dn_hash_lock);
2179 out:
2180         ++*pos;
2181         return rc;
2182 }
2183
2184 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2185 {
2186         if (v && v != SEQ_START_TOKEN)
2187                 read_unlock_bh(&dn_hash_lock);
2188 }
2189
2190 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2191
2192 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2193 {
2194         int i;
2195
2196         switch (dn_ntohs(dn->sdn_objnamel)) {
2197                 case 0:
2198                         sprintf(buf, "%d", dn->sdn_objnum);
2199                         break;
2200                 default:
2201                         for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2202                                 buf[i] = dn->sdn_objname[i];
2203                                 if (IS_NOT_PRINTABLE(buf[i]))
2204                                         buf[i] = '.';
2205                         }
2206                         buf[i] = 0;
2207         }
2208 }
2209
2210 static char *dn_state2asc(unsigned char state)
2211 {
2212         switch(state) {
2213                 case DN_O:
2214                         return "OPEN";
2215                 case DN_CR:
2216                         return "  CR";
2217                 case DN_DR:
2218                         return "  DR";
2219                 case DN_DRC:
2220                         return " DRC";
2221                 case DN_CC:
2222                         return "  CC";
2223                 case DN_CI:
2224                         return "  CI";
2225                 case DN_NR:
2226                         return "  NR";
2227                 case DN_NC:
2228                         return "  NC";
2229                 case DN_CD:
2230                         return "  CD";
2231                 case DN_RJ:
2232                         return "  RJ";
2233                 case DN_RUN:
2234                         return " RUN";
2235                 case DN_DI:
2236                         return "  DI";
2237                 case DN_DIC:
2238                         return " DIC";
2239                 case DN_DN:
2240                         return "  DN";
2241                 case DN_CL:
2242                         return "  CL";
2243                 case DN_CN:
2244                         return "  CN";
2245         }
2246
2247         return "????";
2248 }
2249
2250 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2251 {
2252         struct dn_scp *scp = DN_SK(sk);
2253         char buf1[DN_ASCBUF_LEN];
2254         char buf2[DN_ASCBUF_LEN];
2255         char local_object[DN_MAXOBJL+3];
2256         char remote_object[DN_MAXOBJL+3];
2257
2258         dn_printable_object(&scp->addr, local_object);
2259         dn_printable_object(&scp->peer, remote_object);
2260
2261         seq_printf(seq,
2262                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2263                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2264                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2265                    scp->addrloc,
2266                    scp->numdat,
2267                    scp->numoth,
2268                    scp->ackxmt_dat,
2269                    scp->ackxmt_oth,
2270                    scp->flowloc_sw,
2271                    local_object,
2272                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2273                    scp->addrrem,
2274                    scp->numdat_rcv,
2275                    scp->numoth_rcv,
2276                    scp->ackrcv_dat,
2277                    scp->ackrcv_oth,
2278                    scp->flowrem_sw,
2279                    remote_object,
2280                    dn_state2asc(scp->state),
2281                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2282 }
2283
2284 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2285 {
2286         if (v == SEQ_START_TOKEN) {
2287                 seq_puts(seq, "Local                                              Remote\n");
2288         } else {
2289                 dn_socket_format_entry(seq, v);
2290         }
2291         return 0;
2292 }
2293
2294 static struct seq_operations dn_socket_seq_ops = {
2295         .start  = dn_socket_seq_start,
2296         .next   = dn_socket_seq_next,
2297         .stop   = dn_socket_seq_stop,
2298         .show   = dn_socket_seq_show,
2299 };
2300
2301 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2302 {
2303         struct seq_file *seq;
2304         int rc = -ENOMEM;
2305         struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2306
2307         if (!s)
2308                 goto out;
2309
2310         rc = seq_open(file, &dn_socket_seq_ops);
2311         if (rc)
2312                 goto out_kfree;
2313
2314         seq             = file->private_data;
2315         seq->private    = s;
2316         memset(s, 0, sizeof(*s));
2317 out:
2318         return rc;
2319 out_kfree:
2320         kfree(s);
2321         goto out;
2322 }
2323
2324 static struct file_operations dn_socket_seq_fops = {
2325         .owner          = THIS_MODULE,
2326         .open           = dn_socket_seq_open,
2327         .read           = seq_read,
2328         .llseek         = seq_lseek,
2329         .release        = seq_release_private,
2330 };
2331 #endif
2332
2333 static struct net_proto_family  dn_family_ops = {
2334         .family =       AF_DECnet,
2335         .create =       dn_create,
2336         .owner  =       THIS_MODULE,
2337 };
2338
2339 static struct proto_ops dn_proto_ops = {
2340         .family =       AF_DECnet,
2341         .owner =        THIS_MODULE,
2342         .release =      dn_release,
2343         .bind =         dn_bind,
2344         .connect =      dn_connect,
2345         .socketpair =   sock_no_socketpair,
2346         .accept =       dn_accept,
2347         .getname =      dn_getname,
2348         .poll =         dn_poll,
2349         .ioctl =        dn_ioctl,
2350         .listen =       dn_listen,
2351         .shutdown =     dn_shutdown,
2352         .setsockopt =   dn_setsockopt,
2353         .getsockopt =   dn_getsockopt,
2354         .sendmsg =      dn_sendmsg,
2355         .recvmsg =      dn_recvmsg,
2356         .mmap =         sock_no_mmap,
2357         .sendpage =     sock_no_sendpage,
2358 };
2359
2360 void dn_register_sysctl(void);
2361 void dn_unregister_sysctl(void);
2362
2363 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2364 MODULE_AUTHOR("Linux DECnet Project Team");
2365 MODULE_LICENSE("GPL");
2366 MODULE_ALIAS_NETPROTO(PF_DECnet);
2367
2368 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2369
2370 static int __init decnet_init(void)
2371 {
2372         int rc;
2373
2374         printk(banner);
2375
2376         rc = proto_register(&dn_proto, 1);
2377         if (rc != 0)
2378                 goto out;
2379
2380         dn_neigh_init();
2381         dn_dev_init();
2382         dn_route_init();
2383         dn_fib_init();
2384
2385         sock_register(&dn_family_ops);
2386         dev_add_pack(&dn_dix_packet_type);
2387         register_netdevice_notifier(&dn_dev_notifier);
2388
2389         proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
2390         dn_register_sysctl();
2391 out:
2392         return rc;
2393
2394 }
2395 module_init(decnet_init);
2396
2397 /*
2398  * Prevent DECnet module unloading until its fixed properly.
2399  * Requires an audit of the code to check for memory leaks and
2400  * initialisation problems etc.
2401  */
2402 #if 0
2403 static void __exit decnet_exit(void)
2404 {
2405         sock_unregister(AF_DECnet);
2406         dev_remove_pack(&dn_dix_packet_type);
2407
2408         dn_unregister_sysctl();
2409
2410         unregister_netdevice_notifier(&dn_dev_notifier);
2411
2412         dn_route_cleanup();
2413         dn_dev_cleanup();
2414         dn_neigh_cleanup();
2415         dn_fib_cleanup();
2416
2417         proc_net_remove("decnet");
2418
2419         proto_unregister(&dn_proto);
2420 }
2421 module_exit(decnet_exit);
2422 #endif