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,
 456                                   unsigned int __nocast gfp)
 457 {
 458         struct dn_scp *scp;
 459         struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
 460
 461         if  (!sk)
 462                 goto out;
 463
 464         if (sock)
 465                 sock->ops = &dn_proto_ops;
 466         sock_init_data(sock, sk);
 467
 468         sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
 469         sk->sk_destruct    = dn_destruct;
 470         sk->sk_no_check    = 1;
 471         sk->sk_family      = PF_DECnet;
 472         sk->sk_protocol    = 0;
 473         sk->sk_allocation  = gfp;
 474
 475         /* Initialization of DECnet Session Control Port                */
 476         scp = DN_SK(sk);
 477         scp->state      = DN_O;         /* Open                 */
 478         scp->numdat     = 1;            /* Next data seg to tx  */
 479         scp->numoth     = 1;            /* Next oth data to tx  */
 480         scp->ackxmt_dat = 0;            /* Last data seg ack'ed */
 481         scp->ackxmt_oth = 0;            /* Last oth data ack'ed */
 482         scp->ackrcv_dat = 0;            /* Highest data ack recv*/
 483         scp->ackrcv_oth = 0;            /* Last oth data ack rec*/
 484         scp->flowrem_sw = DN_SEND;
 485         scp->flowloc_sw = DN_SEND;
 486         scp->flowrem_dat = 0;
 487         scp->flowrem_oth = 1;
 488         scp->flowloc_dat = 0;
 489         scp->flowloc_oth = 1;
 490         scp->services_rem = 0;
 491         scp->services_loc = 1 | NSP_FC_NONE;
 492         scp->info_rem = 0;
 493         scp->info_loc = 0x03; /* NSP version 4.1 */
 494         scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
 495         scp->nonagle = 0;
 496         scp->multi_ireq = 1;
 497         scp->accept_mode = ACC_IMMED;
 498         scp->addr.sdn_family    = AF_DECnet;
 499         scp->peer.sdn_family    = AF_DECnet;
 500         scp->accessdata.acc_accl = 5;
 501         memcpy(scp->accessdata.acc_acc, "LINUX", 5);
 502
 503         scp->max_window   = NSP_MAX_WINDOW;
 504         scp->snd_window   = NSP_MIN_WINDOW;
 505         scp->nsp_srtt     = NSP_INITIAL_SRTT;
 506         scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
 507         scp->nsp_rxtshift = 0;
 508
 509         skb_queue_head_init(&scp->data_xmit_queue);
 510         skb_queue_head_init(&scp->other_xmit_queue);
 511         skb_queue_head_init(&scp->other_receive_queue);
 512
 513         scp->persist = 0;
 514         scp->persist_fxn = NULL;
 515         scp->keepalive = 10 * HZ;
 516         scp->keepalive_fxn = dn_keepalive;
 517
 518         init_timer(&scp->delack_timer);
 519         scp->delack_pending = 0;
 520         scp->delack_fxn = dn_nsp_delayed_ack;
 521
 522         dn_start_slow_timer(sk);
 523 out:
 524         return sk;
 525 }
 526
 527 /*
 528  * Keepalive timer.
 529  * FIXME: Should respond to SO_KEEPALIVE etc.
 530  */
 531 static void dn_keepalive(struct sock *sk)
 532 {
 533         struct dn_scp *scp = DN_SK(sk);
 534
 535         /*
 536          * By checking the other_data transmit queue is empty
 537          * we are double checking that we are not sending too
 538          * many of these keepalive frames.
 539          */
 540         if (skb_queue_empty(&scp->other_xmit_queue))
 541                 dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 542 }
 543
 544
 545 /*
 546  * Timer for shutdown/destroyed sockets.
 547  * When socket is dead & no packets have been sent for a
 548  * certain amount of time, they are removed by this
 549  * routine. Also takes care of sending out DI & DC
 550  * frames at correct times.
 551  */
 552 int dn_destroy_timer(struct sock *sk)
 553 {
 554         struct dn_scp *scp = DN_SK(sk);
 555
 556         scp->persist = dn_nsp_persist(sk);
 557
 558         switch(scp->state) {
 559                 case DN_DI:
 560                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 561                         if (scp->nsp_rxtshift >= decnet_di_count)
 562                                 scp->state = DN_CN;
 563                         return 0;
 564
 565                 case DN_DR:
 566                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
 567                         if (scp->nsp_rxtshift >= decnet_dr_count)
 568                                 scp->state = DN_DRC;
 569                         return 0;
 570
 571                 case DN_DN:
 572                         if (scp->nsp_rxtshift < decnet_dn_count) {
 573                                 /* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
 574                                 dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
 575                                 return 0;
 576                         }
 577         }
 578
 579         scp->persist = (HZ * decnet_time_wait);
 580
 581         if (sk->sk_socket)
 582                 return 0;
 583
 584         if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
 585                 dn_unhash_sock(sk);
 586                 sock_put(sk);
 587                 return 1;
 588         }
 589
 590         return 0;
 591 }
 592
 593 static void dn_destroy_sock(struct sock *sk)
 594 {
 595         struct dn_scp *scp = DN_SK(sk);
 596
 597         scp->nsp_rxtshift = 0; /* reset back off */
 598
 599         if (sk->sk_socket) {
 600                 if (sk->sk_socket->state != SS_UNCONNECTED)
 601                         sk->sk_socket->state = SS_DISCONNECTING;
 602         }
 603
 604         sk->sk_state = TCP_CLOSE;
 605
 606         switch(scp->state) {
 607                 case DN_DN:
 608                         dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
 609                                          sk->sk_allocation);
 610                         scp->persist_fxn = dn_destroy_timer;
 611                         scp->persist = dn_nsp_persist(sk);
 612                         break;
 613                 case DN_CR:
 614                         scp->state = DN_DR;
 615                         goto disc_reject;
 616                 case DN_RUN:
 617                         scp->state = DN_DI;
 618                 case DN_DI:
 619                 case DN_DR:
 620 disc_reject:
 621                         dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
 622                 case DN_NC:
 623                 case DN_NR:
 624                 case DN_RJ:
 625                 case DN_DIC:
 626                 case DN_CN:
 627                 case DN_DRC:
 628                 case DN_CI:
 629                 case DN_CD:
 630                         scp->persist_fxn = dn_destroy_timer;
 631                         scp->persist = dn_nsp_persist(sk);
 632                         break;
 633                 default:
 634                         printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
 635                 case DN_O:
 636                         dn_stop_slow_timer(sk);
 637
 638                         dn_unhash_sock_bh(sk);
 639                         sock_put(sk);
 640
 641                         break;
 642         }
 643 }
 644
 645 char *dn_addr2asc(dn_address addr, char *buf)
 646 {
 647         unsigned short node, area;
 648
 649         node = addr & 0x03ff;
 650         area = addr >> 10;
 651         sprintf(buf, "%hd.%hd", area, node);
 652
 653         return buf;
 654 }
 655
 656
 657
 658 static int dn_create(struct socket *sock, int protocol)
 659 {
 660         struct sock *sk;
 661
 662         switch(sock->type) {
 663                 case SOCK_SEQPACKET:
 664                         if (protocol != DNPROTO_NSP)
 665                                 return -EPROTONOSUPPORT;
 666                         break;
 667                 case SOCK_STREAM:
 668                         break;
 669                 default:
 670                         return -ESOCKTNOSUPPORT;
 671         }
 672
 673
 674         if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL)
 675                 return -ENOBUFS;
 676
 677         sk->sk_protocol = protocol;
 678
 679         return 0;
 680 }
 681
 682
 683 static int
 684 dn_release(struct socket *sock)
 685 {
 686         struct sock *sk = sock->sk;
 687
 688         if (sk) {
 689                 sock_orphan(sk);
 690                 sock_hold(sk);
 691                 lock_sock(sk);
 692                 dn_destroy_sock(sk);
 693                 release_sock(sk);
 694                 sock_put(sk);
 695         }
 696
 697         return 0;
 698 }
 699
 700 static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 701 {
 702         struct sock *sk = sock->sk;
 703         struct dn_scp *scp = DN_SK(sk);
 704         struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
 705         struct net_device *dev;
 706         int rv;
 707
 708         if (addr_len != sizeof(struct sockaddr_dn))
 709                 return -EINVAL;
 710
 711         if (saddr->sdn_family != AF_DECnet)
 712                 return -EINVAL;
 713
 714         if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
 715                 return -EINVAL;
 716
 717         if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
 718                 return -EINVAL;
 719
 720         if (saddr->sdn_flags & ~SDF_WILD)
 721                 return -EINVAL;
 722
 723 #if 1
 724         if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
 725             (saddr->sdn_flags & SDF_WILD)))
 726                 return -EACCES;
 727 #else
 728         /*
 729          * Maybe put the default actions in the default security ops for
 730          * dn_prot_sock ? Would be nice if the capable call would go there
 731          * too.
 732          */
 733         if (security_dn_prot_sock(saddr) &&
 734             !capable(CAP_NET_BIND_SERVICE) ||
 735             saddr->sdn_objnum || (saddr->sdn_flags & SDF_WILD))
 736                 return -EACCES;
 737 #endif
 738
 739
 740         if (!(saddr->sdn_flags & SDF_WILD)) {
 741                 if (dn_ntohs(saddr->sdn_nodeaddrl)) {
 742                         read_lock(&dev_base_lock);
 743                         for(dev = dev_base; dev; dev = dev->next) {
 744                                 if (!dev->dn_ptr)
 745                                         continue;
 746                                 if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
 747                                         break;
 748                         }
 749                         read_unlock(&dev_base_lock);
 750                         if (dev == NULL)
 751                                 return -EADDRNOTAVAIL;
 752                 }
 753         }
 754
 755         rv = -EINVAL;
 756         lock_sock(sk);
 757         if (sock_flag(sk, SOCK_ZAPPED)) {
 758                 memcpy(&scp->addr, saddr, addr_len);
 759                 sock_reset_flag(sk, SOCK_ZAPPED);
 760
 761                 rv = dn_hash_sock(sk);
 762                 if (rv)
 763                         sock_set_flag(sk, SOCK_ZAPPED);
 764         }
 765         release_sock(sk);
 766
 767         return rv;
 768 }
 769
 770
 771 static int dn_auto_bind(struct socket *sock)
 772 {
 773         struct sock *sk = sock->sk;
 774         struct dn_scp *scp = DN_SK(sk);
 775         int rv;
 776
 777         sock_reset_flag(sk, SOCK_ZAPPED);
 778
 779         scp->addr.sdn_flags  = 0;
 780         scp->addr.sdn_objnum = 0;
 781
 782         /*
 783          * This stuff is to keep compatibility with Eduardo's
 784          * patch. I hope I can dispense with it shortly...
 785          */
 786         if ((scp->accessdata.acc_accl != 0) &&
 787                 (scp->accessdata.acc_accl <= 12)) {
 788
 789                 scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
 790                 memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
 791
 792                 scp->accessdata.acc_accl = 0;
 793                 memset(scp->accessdata.acc_acc, 0, 40);
 794         }
 795         /* End of compatibility stuff */
 796
 797         scp->addr.sdn_add.a_len = dn_htons(2);
 798         rv = dn_dev_bind_default((dn_address *)scp->addr.sdn_add.a_addr);
 799         if (rv == 0) {
 800                 rv = dn_hash_sock(sk);
 801                 if (rv)
 802                         sock_set_flag(sk, SOCK_ZAPPED);
 803         }
 804
 805         return rv;
 806 }
 807
 808 static int dn_confirm_accept(struct sock *sk, long *timeo,
 809                                 unsigned int __nocast allocation)
 810 {
 811         struct dn_scp *scp = DN_SK(sk);
 812         DEFINE_WAIT(wait);
 813         int err;
 814
 815         if (scp->state != DN_CR)
 816                 return -EINVAL;
 817
 818         scp->state = DN_CC;
 819         scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
 820         dn_send_conn_conf(sk, allocation);
 821
 822         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 823         for(;;) {
 824                 release_sock(sk);
 825                 if (scp->state == DN_CC)
 826                         *timeo = schedule_timeout(*timeo);
 827                 lock_sock(sk);
 828                 err = 0;
 829                 if (scp->state == DN_RUN)
 830                         break;
 831                 err = sock_error(sk);
 832                 if (err)
 833                         break;
 834                 err = sock_intr_errno(*timeo);
 835                 if (signal_pending(current))
 836                         break;
 837                 err = -EAGAIN;
 838                 if (!*timeo)
 839                         break;
 840                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 841         }
 842         finish_wait(sk->sk_sleep, &wait);
 843         if (err == 0) {
 844                 sk->sk_socket->state = SS_CONNECTED;
 845         } else if (scp->state != DN_CC) {
 846                 sk->sk_socket->state = SS_UNCONNECTED;
 847         }
 848         return err;
 849 }
 850
 851 static int dn_wait_run(struct sock *sk, long *timeo)
 852 {
 853         struct dn_scp *scp = DN_SK(sk);
 854         DEFINE_WAIT(wait);
 855         int err = 0;
 856
 857         if (scp->state == DN_RUN)
 858                 goto out;
 859
 860         if (!*timeo)
 861                 return -EALREADY;
 862
 863         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 864         for(;;) {
 865                 release_sock(sk);
 866                 if (scp->state == DN_CI || scp->state == DN_CC)
 867                         *timeo = schedule_timeout(*timeo);
 868                 lock_sock(sk);
 869                 err = 0;
 870                 if (scp->state == DN_RUN)
 871                         break;
 872                 err = sock_error(sk);
 873                 if (err)
 874                         break;
 875                 err = sock_intr_errno(*timeo);
 876                 if (signal_pending(current))
 877                         break;
 878                 err = -ETIMEDOUT;
 879                 if (!*timeo)
 880                         break;
 881                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 882         }
 883         finish_wait(sk->sk_sleep, &wait);
 884 out:
 885         if (err == 0) {
 886                 sk->sk_socket->state = SS_CONNECTED;
 887         } else if (scp->state != DN_CI && scp->state != DN_CC) {
 888                 sk->sk_socket->state = SS_UNCONNECTED;
 889         }
 890         return err;
 891 }
 892
 893 static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 894 {
 895         struct socket *sock = sk->sk_socket;
 896         struct dn_scp *scp = DN_SK(sk);
 897         int err = -EISCONN;
 898         struct flowi fl;
 899
 900         if (sock->state == SS_CONNECTED)
 901                 goto out;
 902
 903         if (sock->state == SS_CONNECTING) {
 904                 err = 0;
 905                 if (scp->state == DN_RUN) {
 906                         sock->state = SS_CONNECTED;
 907                         goto out;
 908                 }
 909                 err = -ECONNREFUSED;
 910                 if (scp->state != DN_CI && scp->state != DN_CC) {
 911                         sock->state = SS_UNCONNECTED;
 912                         goto out;
 913                 }
 914                 return dn_wait_run(sk, timeo);
 915         }
 916
 917         err = -EINVAL;
 918         if (scp->state != DN_O)
 919                 goto out;
 920
 921         if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
 922                 goto out;
 923         if (addr->sdn_family != AF_DECnet)
 924                 goto out;
 925         if (addr->sdn_flags & SDF_WILD)
 926                 goto out;
 927
 928         if (sock_flag(sk, SOCK_ZAPPED)) {
 929                 err = dn_auto_bind(sk->sk_socket);
 930                 if (err)
 931                         goto out;
 932         }
 933
 934         memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
 935
 936         err = -EHOSTUNREACH;
 937         memset(&fl, 0, sizeof(fl));
 938         fl.oif = sk->sk_bound_dev_if;
 939         fl.fld_dst = dn_saddr2dn(&scp->peer);
 940         fl.fld_src = dn_saddr2dn(&scp->addr);
 941         dn_sk_ports_copy(&fl, scp);
 942         fl.proto = DNPROTO_NSP;
 943         if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
 944                 goto out;
 945         sk->sk_route_caps = sk->sk_dst_cache->dev->features;
 946         sock->state = SS_CONNECTING;
 947         scp->state = DN_CI;
 948         scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
 949
 950         dn_nsp_send_conninit(sk, NSP_CI);
 951         err = -EINPROGRESS;
 952         if (*timeo) {
 953                 err = dn_wait_run(sk, timeo);
 954         }
 955 out:
 956         return err;
 957 }
 958
 959 static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
 960 {
 961         struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
 962         struct sock *sk = sock->sk;
 963         int err;
 964         long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 965
 966         lock_sock(sk);
 967         err = __dn_connect(sk, addr, addrlen, &timeo, 0);
 968         release_sock(sk);
 969
 970         return err;
 971 }
 972
 973 static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
 974 {
 975         struct dn_scp *scp = DN_SK(sk);
 976
 977         switch(scp->state) {
 978                 case DN_RUN:
 979                         return 0;
 980                 case DN_CR:
 981                         return dn_confirm_accept(sk, timeo, sk->sk_allocation);
 982                 case DN_CI:
 983                 case DN_CC:
 984                         return dn_wait_run(sk, timeo);
 985                 case DN_O:
 986                         return __dn_connect(sk, addr, addrlen, timeo, flags);
 987         }
 988
 989         return -EINVAL;
 990 }
 991
 992
 993 static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
 994 {
 995         unsigned char *ptr = skb->data;
 996
 997         acc->acc_userl = *ptr++;
 998         memcpy(&acc->acc_user, ptr, acc->acc_userl);
 999         ptr += acc->acc_userl;
1000
1001         acc->acc_passl = *ptr++;
1002         memcpy(&acc->acc_pass, ptr, acc->acc_passl);
1003         ptr += acc->acc_passl;
1004
1005         acc->acc_accl = *ptr++;
1006         memcpy(&acc->acc_acc, ptr, acc->acc_accl);
1007
1008         skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
1009
1010 }
1011
1012 static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
1013 {
1014         unsigned char *ptr = skb->data;
1015
1016         opt->opt_optl   = *ptr++;
1017         opt->opt_status = 0;
1018         memcpy(opt->opt_data, ptr, opt->opt_optl);
1019         skb_pull(skb, opt->opt_optl + 1);
1020
1021 }
1022
1023 static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
1024 {
1025         DEFINE_WAIT(wait);
1026         struct sk_buff *skb = NULL;
1027         int err = 0;
1028
1029         prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1030         for(;;) {
1031                 release_sock(sk);
1032                 skb = skb_dequeue(&sk->sk_receive_queue);
1033                 if (skb == NULL) {
1034                         *timeo = schedule_timeout(*timeo);
1035                         skb = skb_dequeue(&sk->sk_receive_queue);
1036                 }
1037                 lock_sock(sk);
1038                 if (skb != NULL)
1039                         break;
1040                 err = -EINVAL;
1041                 if (sk->sk_state != TCP_LISTEN)
1042                         break;
1043                 err = sock_intr_errno(*timeo);
1044                 if (signal_pending(current))
1045                         break;
1046                 err = -EAGAIN;
1047                 if (!*timeo)
1048                         break;
1049                 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1050         }
1051         finish_wait(sk->sk_sleep, &wait);
1052
1053         return skb == NULL ? ERR_PTR(err) : skb;
1054 }
1055
1056 static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
1057 {
1058         struct sock *sk = sock->sk, *newsk;
1059         struct sk_buff *skb = NULL;
1060         struct dn_skb_cb *cb;
1061         unsigned char menuver;
1062         int err = 0;
1063         unsigned char type;
1064         long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1065
1066         lock_sock(sk);
1067
1068         if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
1069                 release_sock(sk);
1070                 return -EINVAL;
1071         }
1072
1073         skb = skb_dequeue(&sk->sk_receive_queue);
1074         if (skb == NULL) {
1075                 skb = dn_wait_for_connect(sk, &timeo);
1076                 if (IS_ERR(skb)) {
1077                         release_sock(sk);
1078                         return PTR_ERR(skb);
1079                 }
1080         }
1081
1082         cb = DN_SKB_CB(skb);
1083         sk->sk_ack_backlog--;
1084         newsk = dn_alloc_sock(newsock, sk->sk_allocation);
1085         if (newsk == NULL) {
1086                 release_sock(sk);
1087                 kfree_skb(skb);
1088                 return -ENOBUFS;
1089         }
1090         release_sock(sk);
1091
1092         dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
1093         skb->dst = NULL;
1094
1095         DN_SK(newsk)->state        = DN_CR;
1096         DN_SK(newsk)->addrrem      = cb->src_port;
1097         DN_SK(newsk)->services_rem = cb->services;
1098         DN_SK(newsk)->info_rem     = cb->info;
1099         DN_SK(newsk)->segsize_rem  = cb->segsize;
1100         DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
1101
1102         if (DN_SK(newsk)->segsize_rem < 230)
1103                 DN_SK(newsk)->segsize_rem = 230;
1104
1105         if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
1106                 DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
1107
1108         newsk->sk_state  = TCP_LISTEN;
1109         memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
1110
1111         /*
1112          * If we are listening on a wild socket, we don't want
1113          * the newly created socket on the wrong hash queue.
1114          */
1115         DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
1116
1117         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
1118         skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
1119         *(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
1120         *(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
1121
1122         menuver = *skb->data;
1123         skb_pull(skb, 1);
1124
1125         if (menuver & DN_MENUVER_ACC)
1126                 dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
1127
1128         if (menuver & DN_MENUVER_USR)
1129                 dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
1130
1131         if (menuver & DN_MENUVER_PRX)
1132                 DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
1133
1134         if (menuver & DN_MENUVER_UIC)
1135                 DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
1136
1137         kfree_skb(skb);
1138
1139         memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
1140                 sizeof(struct optdata_dn));
1141         memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
1142                 sizeof(struct optdata_dn));
1143
1144         lock_sock(newsk);
1145         err = dn_hash_sock(newsk);
1146         if (err == 0) {
1147                 sock_reset_flag(newsk, SOCK_ZAPPED);
1148                 dn_send_conn_ack(newsk);
1149
1150                 /*
1151                  * Here we use sk->sk_allocation since although the conn conf is
1152                  * for the newsk, the context is the old socket.
1153                  */
1154                 if (DN_SK(newsk)->accept_mode == ACC_IMMED)
1155                         err = dn_confirm_accept(newsk, &timeo,
1156                                                 sk->sk_allocation);
1157         }
1158         release_sock(newsk);
1159         return err;
1160 }
1161
1162
1163 static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
1164 {
1165         struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
1166         struct sock *sk = sock->sk;
1167         struct dn_scp *scp = DN_SK(sk);
1168
1169         *uaddr_len = sizeof(struct sockaddr_dn);
1170
1171         lock_sock(sk);
1172
1173         if (peer) {
1174                 if ((sock->state != SS_CONNECTED &&
1175                      sock->state != SS_CONNECTING) &&
1176                     scp->accept_mode == ACC_IMMED)
1177                         return -ENOTCONN;
1178
1179                 memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
1180         } else {
1181                 memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
1182         }
1183
1184         release_sock(sk);
1185
1186         return 0;
1187 }
1188
1189
1190 static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
1191 {
1192         struct sock *sk = sock->sk;
1193         struct dn_scp *scp = DN_SK(sk);
1194         int mask = datagram_poll(file, sock, wait);
1195
1196         if (!skb_queue_empty(&scp->other_receive_queue))
1197                 mask |= POLLRDBAND;
1198
1199         return mask;
1200 }
1201
1202 static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1203 {
1204         struct sock *sk = sock->sk;
1205         struct dn_scp *scp = DN_SK(sk);
1206         int err = -EOPNOTSUPP;
1207         long amount = 0;
1208         struct sk_buff *skb;
1209         int val;
1210
1211         switch(cmd)
1212         {
1213         case SIOCGIFADDR:
1214         case SIOCSIFADDR:
1215                 return dn_dev_ioctl(cmd, (void __user *)arg);
1216
1217         case SIOCATMARK:
1218                 lock_sock(sk);
1219                 val = !skb_queue_empty(&scp->other_receive_queue);
1220                 if (scp->state != DN_RUN)
1221                         val = -ENOTCONN;
1222                 release_sock(sk);
1223                 return val;
1224
1225         case TIOCOUTQ:
1226                 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
1227                 if (amount < 0)
1228                         amount = 0;
1229                 err = put_user(amount, (int __user *)arg);
1230                 break;
1231
1232         case TIOCINQ:
1233                 lock_sock(sk);
1234                 if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
1235                         amount = skb->len;
1236                 } else {
1237                         struct sk_buff *skb = sk->sk_receive_queue.next;
1238                         for(;;) {
1239                                 if (skb ==
1240                                     (struct sk_buff *)&sk->sk_receive_queue)
1241                                         break;
1242                                 amount += skb->len;
1243                                 skb = skb->next;
1244                         }
1245                 }
1246                 release_sock(sk);
1247                 err = put_user(amount, (int __user *)arg);
1248                 break;
1249
1250         default:
1251                 err = dev_ioctl(cmd, (void __user *)arg);
1252                 break;
1253         }
1254
1255         return err;
1256 }
1257
1258 static int dn_listen(struct socket *sock, int backlog)
1259 {
1260         struct sock *sk = sock->sk;
1261         int err = -EINVAL;
1262
1263         lock_sock(sk);
1264
1265         if (sock_flag(sk, SOCK_ZAPPED))
1266                 goto out;
1267
1268         if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
1269                 goto out;
1270
1271         sk->sk_max_ack_backlog = backlog;
1272         sk->sk_ack_backlog     = 0;
1273         sk->sk_state           = TCP_LISTEN;
1274         err                 = 0;
1275         dn_rehash_sock(sk);
1276
1277 out:
1278         release_sock(sk);
1279
1280         return err;
1281 }
1282
1283
1284 static int dn_shutdown(struct socket *sock, int how)
1285 {
1286         struct sock *sk = sock->sk;
1287         struct dn_scp *scp = DN_SK(sk);
1288         int err = -ENOTCONN;
1289
1290         lock_sock(sk);
1291
1292         if (sock->state == SS_UNCONNECTED)
1293                 goto out;
1294
1295         err = 0;
1296         if (sock->state == SS_DISCONNECTING)
1297                 goto out;
1298
1299         err = -EINVAL;
1300         if (scp->state == DN_O)
1301                 goto out;
1302
1303         if (how != SHUTDOWN_MASK)
1304                 goto out;
1305
1306         sk->sk_shutdown = how;
1307         dn_destroy_sock(sk);
1308         err = 0;
1309
1310 out:
1311         release_sock(sk);
1312
1313         return err;
1314 }
1315
1316 static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
1317 {
1318         struct sock *sk = sock->sk;
1319         int err;
1320
1321         lock_sock(sk);
1322         err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
1323         release_sock(sk);
1324
1325         return err;
1326 }
1327
1328 static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags)
1329 {
1330         struct  sock *sk = sock->sk;
1331         struct dn_scp *scp = DN_SK(sk);
1332         long timeo;
1333         union {
1334                 struct optdata_dn opt;
1335                 struct accessdata_dn acc;
1336                 int mode;
1337                 unsigned long win;
1338                 int val;
1339                 unsigned char services;
1340                 unsigned char info;
1341         } u;
1342         int err;
1343
1344         if (optlen && !optval)
1345                 return -EINVAL;
1346
1347         if (optlen > sizeof(u))
1348                 return -EINVAL;
1349
1350         if (copy_from_user(&u, optval, optlen))
1351                 return -EFAULT;
1352
1353         switch(optname) {
1354                 case DSO_CONDATA:
1355                         if (sock->state == SS_CONNECTED)
1356                                 return -EISCONN;
1357                         if ((scp->state != DN_O) && (scp->state != DN_CR))
1358                                 return -EINVAL;
1359
1360                         if (optlen != sizeof(struct optdata_dn))
1361                                 return -EINVAL;
1362
1363                         if (u.opt.opt_optl > 16)
1364                                 return -EINVAL;
1365
1366                         memcpy(&scp->conndata_out, &u.opt, optlen);
1367                         break;
1368
1369                 case DSO_DISDATA:
1370                         if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
1371                                 return -ENOTCONN;
1372
1373                         if (optlen != sizeof(struct optdata_dn))
1374                                 return -EINVAL;
1375
1376                         if (u.opt.opt_optl > 16)
1377                                 return -EINVAL;
1378
1379                         memcpy(&scp->discdata_out, &u.opt, optlen);
1380                         break;
1381
1382                 case DSO_CONACCESS:
1383                         if (sock->state == SS_CONNECTED)
1384                                 return -EISCONN;
1385                         if (scp->state != DN_O)
1386                                 return -EINVAL;
1387
1388                         if (optlen != sizeof(struct accessdata_dn))
1389                                 return -EINVAL;
1390
1391                         if ((u.acc.acc_accl > DN_MAXACCL) ||
1392                                         (u.acc.acc_passl > DN_MAXACCL) ||
1393                                         (u.acc.acc_userl > DN_MAXACCL))
1394                                 return -EINVAL;
1395
1396                         memcpy(&scp->accessdata, &u.acc, optlen);
1397                         break;
1398
1399                 case DSO_ACCEPTMODE:
1400                         if (sock->state == SS_CONNECTED)
1401                                 return -EISCONN;
1402                         if (scp->state != DN_O)
1403                                 return -EINVAL;
1404
1405                         if (optlen != sizeof(int))
1406                                 return -EINVAL;
1407
1408                         if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
1409                                 return -EINVAL;
1410
1411                         scp->accept_mode = (unsigned char)u.mode;
1412                         break;
1413
1414                 case DSO_CONACCEPT:
1415
1416                         if (scp->state != DN_CR)
1417                                 return -EINVAL;
1418                         timeo = sock_rcvtimeo(sk, 0);
1419                         err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
1420                         return err;
1421
1422                 case DSO_CONREJECT:
1423
1424                         if (scp->state != DN_CR)
1425                                 return -EINVAL;
1426
1427                         scp->state = DN_DR;
1428                         sk->sk_shutdown = SHUTDOWN_MASK;
1429                         dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
1430                         break;
1431
1432                 default:
1433 #ifdef CONFIG_NETFILTER
1434                 return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
1435 #endif
1436                 case DSO_LINKINFO:
1437                 case DSO_STREAM:
1438                 case DSO_SEQPACKET:
1439                         return -ENOPROTOOPT;
1440
1441                 case DSO_MAXWINDOW:
1442                         if (optlen != sizeof(unsigned long))
1443                                 return -EINVAL;
1444                         if (u.win > NSP_MAX_WINDOW)
1445                                 u.win = NSP_MAX_WINDOW;
1446                         if (u.win == 0)
1447                                 return -EINVAL;
1448                         scp->max_window = u.win;
1449                         if (scp->snd_window > u.win)
1450                                 scp->snd_window = u.win;
1451                         break;
1452
1453                 case DSO_NODELAY:
1454                         if (optlen != sizeof(int))
1455                                 return -EINVAL;
1456                         if (scp->nonagle == 2)
1457                                 return -EINVAL;
1458                         scp->nonagle = (u.val == 0) ? 0 : 1;
1459                         /* if (scp->nonagle == 1) { Push pending frames } */
1460                         break;
1461
1462                 case DSO_CORK:
1463                         if (optlen != sizeof(int))
1464                                 return -EINVAL;
1465                         if (scp->nonagle == 1)
1466                                 return -EINVAL;
1467                         scp->nonagle = (u.val == 0) ? 0 : 2;
1468                         /* if (scp->nonagle == 0) { Push pending frames } */
1469                         break;
1470
1471                 case DSO_SERVICES:
1472                         if (optlen != sizeof(unsigned char))
1473                                 return -EINVAL;
1474                         if ((u.services & ~NSP_FC_MASK) != 0x01)
1475                                 return -EINVAL;
1476                         if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
1477                                 return -EINVAL;
1478                         scp->services_loc = u.services;
1479                         break;
1480
1481                 case DSO_INFO:
1482                         if (optlen != sizeof(unsigned char))
1483                                 return -EINVAL;
1484                         if (u.info & 0xfc)
1485                                 return -EINVAL;
1486                         scp->info_loc = u.info;
1487                         break;
1488         }
1489
1490         return 0;
1491 }
1492
1493 static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1494 {
1495         struct sock *sk = sock->sk;
1496         int err;
1497
1498         lock_sock(sk);
1499         err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
1500         release_sock(sk);
1501
1502         return err;
1503 }
1504
1505 static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
1506 {
1507         struct  sock *sk = sock->sk;
1508         struct dn_scp *scp = DN_SK(sk);
1509         struct linkinfo_dn link;
1510         unsigned int r_len;
1511         void *r_data = NULL;
1512         unsigned int val;
1513
1514         if(get_user(r_len , optlen))
1515                 return -EFAULT;
1516
1517         switch(optname) {
1518                 case DSO_CONDATA:
1519                         if (r_len > sizeof(struct optdata_dn))
1520                                 r_len = sizeof(struct optdata_dn);
1521                         r_data = &scp->conndata_in;
1522                         break;
1523
1524                 case DSO_DISDATA:
1525                         if (r_len > sizeof(struct optdata_dn))
1526                                 r_len = sizeof(struct optdata_dn);
1527                         r_data = &scp->discdata_in;
1528                         break;
1529
1530                 case DSO_CONACCESS:
1531                         if (r_len > sizeof(struct accessdata_dn))
1532                                 r_len = sizeof(struct accessdata_dn);
1533                         r_data = &scp->accessdata;
1534                         break;
1535
1536                 case DSO_ACCEPTMODE:
1537                         if (r_len > sizeof(unsigned char))
1538                                 r_len = sizeof(unsigned char);
1539                         r_data = &scp->accept_mode;
1540                         break;
1541
1542                 case DSO_LINKINFO:
1543                         if (r_len > sizeof(struct linkinfo_dn))
1544                                 r_len = sizeof(struct linkinfo_dn);
1545
1546                         switch(sock->state) {
1547                                 case SS_CONNECTING:
1548                                         link.idn_linkstate = LL_CONNECTING;
1549                                         break;
1550                                 case SS_DISCONNECTING:
1551                                         link.idn_linkstate = LL_DISCONNECTING;
1552                                         break;
1553                                 case SS_CONNECTED:
1554                                         link.idn_linkstate = LL_RUNNING;
1555                                         break;
1556                                 default:
1557                                         link.idn_linkstate = LL_INACTIVE;
1558                         }
1559
1560                         link.idn_segsize = scp->segsize_rem;
1561                         r_data = &link;
1562                         break;
1563
1564                 default:
1565 #ifdef CONFIG_NETFILTER
1566                 {
1567                         int val, len;
1568
1569                         if(get_user(len, optlen))
1570                                 return -EFAULT;
1571
1572                         val = nf_getsockopt(sk, PF_DECnet, optname,
1573                                                         optval, &len);
1574                         if (val >= 0)
1575                                 val = put_user(len, optlen);
1576                         return val;
1577                 }
1578 #endif
1579                 case DSO_STREAM:
1580                 case DSO_SEQPACKET:
1581                 case DSO_CONACCEPT:
1582                 case DSO_CONREJECT:
1583                         return -ENOPROTOOPT;
1584
1585                 case DSO_MAXWINDOW:
1586                         if (r_len > sizeof(unsigned long))
1587                                 r_len = sizeof(unsigned long);
1588                         r_data = &scp->max_window;
1589                         break;
1590
1591                 case DSO_NODELAY:
1592                         if (r_len > sizeof(int))
1593                                 r_len = sizeof(int);
1594                         val = (scp->nonagle == 1);
1595                         r_data = &val;
1596                         break;
1597
1598                 case DSO_CORK:
1599                         if (r_len > sizeof(int))
1600                                 r_len = sizeof(int);
1601                         val = (scp->nonagle == 2);
1602                         r_data = &val;
1603                         break;
1604
1605                 case DSO_SERVICES:
1606                         if (r_len > sizeof(unsigned char))
1607                                 r_len = sizeof(unsigned char);
1608                         r_data = &scp->services_rem;
1609                         break;
1610
1611                 case DSO_INFO:
1612                         if (r_len > sizeof(unsigned char))
1613                                 r_len = sizeof(unsigned char);
1614                         r_data = &scp->info_rem;
1615                         break;
1616         }
1617
1618         if (r_data) {
1619                 if (copy_to_user(optval, r_data, r_len))
1620                         return -EFAULT;
1621                 if (put_user(r_len, optlen))
1622                         return -EFAULT;
1623         }
1624
1625         return 0;
1626 }
1627
1628
1629 static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
1630 {
1631         struct sk_buff *skb = q->next;
1632         int len = 0;
1633
1634         if (flags & MSG_OOB)
1635                 return !skb_queue_empty(q) ? 1 : 0;
1636
1637         while(skb != (struct sk_buff *)q) {
1638                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
1639                 len += skb->len;
1640
1641                 if (cb->nsp_flags & 0x40) {
1642                         /* SOCK_SEQPACKET reads to EOM */
1643                         if (sk->sk_type == SOCK_SEQPACKET)
1644                                 return 1;
1645                         /* so does SOCK_STREAM unless WAITALL is specified */
1646                         if (!(flags & MSG_WAITALL))
1647                                 return 1;
1648                 }
1649
1650                 /* minimum data length for read exceeded */
1651                 if (len >= target)
1652                         return 1;
1653
1654                 skb = skb->next;
1655         }
1656
1657         return 0;
1658 }
1659
1660
1661 static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
1662         struct msghdr *msg, size_t size, int flags)
1663 {
1664         struct sock *sk = sock->sk;
1665         struct dn_scp *scp = DN_SK(sk);
1666         struct sk_buff_head *queue = &sk->sk_receive_queue;
1667         size_t target = size > 1 ? 1 : 0;
1668         size_t copied = 0;
1669         int rv = 0;
1670         struct sk_buff *skb, *nskb;
1671         struct dn_skb_cb *cb = NULL;
1672         unsigned char eor = 0;
1673         long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1674
1675         lock_sock(sk);
1676
1677         if (sock_flag(sk, SOCK_ZAPPED)) {
1678                 rv = -EADDRNOTAVAIL;
1679                 goto out;
1680         }
1681
1682         rv = dn_check_state(sk, NULL, 0, &timeo, flags);
1683         if (rv)
1684                 goto out;
1685
1686         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1687                 if (!(flags & MSG_NOSIGNAL))
1688                         send_sig(SIGPIPE, current, 0);
1689                 rv = -EPIPE;
1690                 goto out;
1691         }
1692
1693         if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
1694                 rv = -EOPNOTSUPP;
1695                 goto out;
1696         }
1697
1698         if (flags & MSG_OOB)
1699                 queue = &scp->other_receive_queue;
1700
1701         if (flags & MSG_WAITALL)
1702                 target = size;
1703
1704
1705         /*
1706          * See if there is data ready to read, sleep if there isn't
1707          */
1708         for(;;) {
1709                 if (sk->sk_err)
1710                         goto out;
1711
1712                 if (!skb_queue_empty(&scp->other_receive_queue)) {
1713                         if (!(flags & MSG_OOB)) {
1714                                 msg->msg_flags |= MSG_OOB;
1715                                 if (!scp->other_report) {
1716                                         scp->other_report = 1;
1717                                         goto out;
1718                                 }
1719                         }
1720                 }
1721
1722                 if (scp->state != DN_RUN)
1723                         goto out;
1724
1725                 if (signal_pending(current)) {
1726                         rv = sock_intr_errno(timeo);
1727                         goto out;
1728                 }
1729
1730                 if (dn_data_ready(sk, queue, flags, target))
1731                         break;
1732
1733                 if (flags & MSG_DONTWAIT) {
1734                         rv = -EWOULDBLOCK;
1735                         goto out;
1736                 }
1737
1738                 set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1739                 SOCK_SLEEP_PRE(sk)
1740
1741                 if (!dn_data_ready(sk, queue, flags, target))
1742                         schedule();
1743
1744                 SOCK_SLEEP_POST(sk)
1745                 clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
1746         }
1747
1748         for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
1749                 unsigned int chunk = skb->len;
1750                 cb = DN_SKB_CB(skb);
1751
1752                 if ((chunk + copied) > size)
1753                         chunk = size - copied;
1754
1755                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1756                         rv = -EFAULT;
1757                         break;
1758                 }
1759                 copied += chunk;
1760
1761                 if (!(flags & MSG_PEEK))
1762                         skb_pull(skb, chunk);
1763
1764                 eor = cb->nsp_flags & 0x40;
1765                 nskb = skb->next;
1766
1767                 if (skb->len == 0) {
1768                         skb_unlink(skb, queue);
1769                         kfree_skb(skb);
1770                         /*
1771                          * N.B. Don't refer to skb or cb after this point
1772                          * in loop.
1773                          */
1774                         if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
1775                                 scp->flowloc_sw = DN_SEND;
1776                                 dn_nsp_send_link(sk, DN_SEND, 0);
1777                         }
1778                 }
1779
1780                 if (eor) {
1781                         if (sk->sk_type == SOCK_SEQPACKET)
1782                                 break;
1783                         if (!(flags & MSG_WAITALL))
1784                                 break;
1785                 }
1786
1787                 if (flags & MSG_OOB)
1788                         break;
1789
1790                 if (copied >= target)
1791                         break;
1792         }
1793
1794         rv = copied;
1795
1796
1797         if (eor && (sk->sk_type == SOCK_SEQPACKET))
1798                 msg->msg_flags |= MSG_EOR;
1799
1800 out:
1801         if (rv == 0)
1802                 rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
1803
1804         if ((rv >= 0) && msg->msg_name) {
1805                 memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
1806                 msg->msg_namelen = sizeof(struct sockaddr_dn);
1807         }
1808
1809         release_sock(sk);
1810
1811         return rv;
1812 }
1813
1814
1815 static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
1816 {
1817         unsigned char fctype = scp->services_rem & NSP_FC_MASK;
1818         if (skb_queue_len(queue) >= scp->snd_window)
1819                 return 1;
1820         if (fctype != NSP_FC_NONE) {
1821                 if (flags & MSG_OOB) {
1822                         if (scp->flowrem_oth == 0)
1823                                 return 1;
1824                 } else {
1825                         if (scp->flowrem_dat == 0)
1826                                 return 1;
1827                 }
1828         }
1829         return 0;
1830 }
1831
1832 /*
1833  * The DECnet spec requires the the "routing layer" accepts packets which
1834  * are at least 230 bytes in size. This excludes any headers which the NSP
1835  * layer might add, so we always assume that we'll be using the maximal
1836  * length header on data packets. The variation in length is due to the
1837  * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
1838  * make much practical difference.
1839  */
1840 unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
1841 {
1842         unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
1843         if (dev) {
1844                 struct dn_dev *dn_db = dev->dn_ptr;
1845                 mtu -= LL_RESERVED_SPACE(dev);
1846                 if (dn_db->use_long)
1847                         mtu -= 21;
1848                 else
1849                         mtu -= 6;
1850                 mtu -= DN_MAX_NSP_DATA_HEADER;
1851         } else {
1852                 /*
1853                  * 21 = long header, 16 = guess at MAC header length
1854                  */
1855                 mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
1856         }
1857         if (mtu > mss)
1858                 mss = mtu;
1859         return mss;
1860 }
1861
1862 static inline unsigned int dn_current_mss(struct sock *sk, int flags)
1863 {
1864         struct dst_entry *dst = __sk_dst_get(sk);
1865         struct dn_scp *scp = DN_SK(sk);
1866         int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
1867
1868         /* Other data messages are limited to 16 bytes per packet */
1869         if (flags & MSG_OOB)
1870                 return 16;
1871
1872         /* This works out the maximum size of segment we can send out */
1873         if (dst) {
1874                 u32 mtu = dst_mtu(dst);
1875                 mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
1876         }
1877
1878         return mss_now;
1879 }
1880
1881 /*
1882  * N.B. We get the timeout wrong here, but then we always did get it
1883  * wrong before and this is another step along the road to correcting
1884  * it. It ought to get updated each time we pass through the routine,
1885  * but in practise it probably doesn't matter too much for now.
1886  */
1887 static inline struct sk_buff *dn_alloc_send_pskb(struct sock *sk,
1888                               unsigned long datalen, int noblock,
1889                               int *errcode)
1890 {
1891         struct sk_buff *skb = sock_alloc_send_skb(sk, datalen,
1892                                                    noblock, errcode);
1893         if (skb) {
1894                 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1895                 skb->pkt_type = PACKET_OUTGOING;
1896         }
1897         return skb;
1898 }
1899
1900 static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
1901                       struct msghdr *msg, size_t size)
1902 {
1903         struct sock *sk = sock->sk;
1904         struct dn_scp *scp = DN_SK(sk);
1905         size_t mss;
1906         struct sk_buff_head *queue = &scp->data_xmit_queue;
1907         int flags = msg->msg_flags;
1908         int err = 0;
1909         size_t sent = 0;
1910         int addr_len = msg->msg_namelen;
1911         struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
1912         struct sk_buff *skb = NULL;
1913         struct dn_skb_cb *cb;
1914         size_t len;
1915         unsigned char fctype;
1916         long timeo;
1917
1918         if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
1919                 return -EOPNOTSUPP;
1920
1921         if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
1922                 return -EINVAL;
1923
1924         lock_sock(sk);
1925         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1926         /*
1927          * The only difference between stream sockets and sequenced packet
1928          * sockets is that the stream sockets always behave as if MSG_EOR
1929          * has been set.
1930          */
1931         if (sock->type == SOCK_STREAM) {
1932                 if (flags & MSG_EOR) {
1933                         err = -EINVAL;
1934                         goto out;
1935                 }
1936                 flags |= MSG_EOR;
1937         }
1938
1939
1940         err = dn_check_state(sk, addr, addr_len, &timeo, flags);
1941         if (err)
1942                 goto out_err;
1943
1944         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1945                 err = -EPIPE;
1946                 goto out_err;
1947         }
1948
1949         if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
1950                 dst_negative_advice(&sk->sk_dst_cache);
1951
1952         mss = scp->segsize_rem;
1953         fctype = scp->services_rem & NSP_FC_MASK;
1954
1955         mss = dn_current_mss(sk, flags);
1956
1957         if (flags & MSG_OOB) {
1958                 queue = &scp->other_xmit_queue;
1959                 if (size > mss) {
1960                         err = -EMSGSIZE;
1961                         goto out;
1962                 }
1963         }
1964
1965         scp->persist_fxn = dn_nsp_xmit_timeout;
1966
1967         while(sent < size) {
1968                 err = sock_error(sk);
1969                 if (err)
1970                         goto out;
1971
1972                 if (signal_pending(current)) {
1973                         err = sock_intr_errno(timeo);
1974                         goto out;
1975                 }
1976
1977                 /*
1978                  * Calculate size that we wish to send.
1979                  */
1980                 len = size - sent;
1981
1982                 if (len > mss)
1983                         len = mss;
1984
1985                 /*
1986                  * Wait for queue size to go down below the window
1987                  * size.
1988                  */
1989                 if (dn_queue_too_long(scp, queue, flags)) {
1990                         if (flags & MSG_DONTWAIT) {
1991                                 err = -EWOULDBLOCK;
1992                                 goto out;
1993                         }
1994
1995                         SOCK_SLEEP_PRE(sk)
1996
1997                         if (dn_queue_too_long(scp, queue, flags))
1998                                 schedule();
1999
2000                         SOCK_SLEEP_POST(sk)
2001
2002                         continue;
2003                 }
2004
2005                 /*
2006                  * Get a suitably sized skb.
2007                  * 64 is a bit of a hack really, but its larger than any
2008                  * link-layer headers and has served us well as a good
2009                  * guess as to their real length.
2010                  */
2011                 skb = dn_alloc_send_pskb(sk, len + 64 + DN_MAX_NSP_DATA_HEADER,
2012                                          flags & MSG_DONTWAIT, &err);
2013
2014                 if (err)
2015                         break;
2016
2017                 if (!skb)
2018                         continue;
2019
2020                 cb = DN_SKB_CB(skb);
2021
2022                 skb_reserve(skb, 64 + DN_MAX_NSP_DATA_HEADER);
2023
2024                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
2025                         err = -EFAULT;
2026                         goto out;
2027                 }
2028
2029                 if (flags & MSG_OOB) {
2030                         cb->nsp_flags = 0x30;
2031                         if (fctype != NSP_FC_NONE)
2032                                 scp->flowrem_oth--;
2033                 } else {
2034                         cb->nsp_flags = 0x00;
2035                         if (scp->seg_total == 0)
2036                                 cb->nsp_flags |= 0x20;
2037
2038                         scp->seg_total += len;
2039
2040                         if (((sent + len) == size) && (flags & MSG_EOR)) {
2041                                 cb->nsp_flags |= 0x40;
2042                                 scp->seg_total = 0;
2043                                 if (fctype == NSP_FC_SCMC)
2044                                         scp->flowrem_dat--;
2045                         }
2046                         if (fctype == NSP_FC_SRC)
2047                                 scp->flowrem_dat--;
2048                 }
2049
2050                 sent += len;
2051                 dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
2052                 skb = NULL;
2053
2054                 scp->persist = dn_nsp_persist(sk);
2055
2056         }
2057 out:
2058
2059         if (skb)
2060                 kfree_skb(skb);
2061
2062         release_sock(sk);
2063
2064         return sent ? sent : err;
2065
2066 out_err:
2067         err = sk_stream_error(sk, flags, err);
2068         release_sock(sk);
2069         return err;
2070 }
2071
2072 static int dn_device_event(struct notifier_block *this, unsigned long event,
2073                         void *ptr)
2074 {
2075         struct net_device *dev = (struct net_device *)ptr;
2076
2077         switch(event) {
2078                 case NETDEV_UP:
2079                         dn_dev_up(dev);
2080                         break;
2081                 case NETDEV_DOWN:
2082                         dn_dev_down(dev);
2083                         break;
2084                 default:
2085                         break;
2086         }
2087
2088         return NOTIFY_DONE;
2089 }
2090
2091 static struct notifier_block dn_dev_notifier = {
2092         .notifier_call = dn_device_event,
2093 };
2094
2095 extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
2096
2097 static struct packet_type dn_dix_packet_type = {
2098         .type =         __constant_htons(ETH_P_DNA_RT),
2099         .dev =          NULL,           /* All devices */
2100         .func =         dn_route_rcv,
2101 };
2102
2103 #ifdef CONFIG_PROC_FS
2104 struct dn_iter_state {
2105         int bucket;
2106 };
2107
2108 static struct sock *dn_socket_get_first(struct seq_file *seq)
2109 {
2110         struct dn_iter_state *state = seq->private;
2111         struct sock *n = NULL;
2112
2113         for(state->bucket = 0;
2114             state->bucket < DN_SK_HASH_SIZE;
2115             ++state->bucket) {
2116                 n = sk_head(&dn_sk_hash[state->bucket]);
2117                 if (n)
2118                         break;
2119         }
2120
2121         return n;
2122 }
2123
2124 static struct sock *dn_socket_get_next(struct seq_file *seq,
2125                                        struct sock *n)
2126 {
2127         struct dn_iter_state *state = seq->private;
2128
2129         n = sk_next(n);
2130 try_again:
2131         if (n)
2132                 goto out;
2133         if (++state->bucket >= DN_SK_HASH_SIZE)
2134                 goto out;
2135         n = sk_head(&dn_sk_hash[state->bucket]);
2136         goto try_again;
2137 out:
2138         return n;
2139 }
2140
2141 static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
2142 {
2143         struct sock *sk = dn_socket_get_first(seq);
2144
2145         if (sk) {
2146                 while(*pos && (sk = dn_socket_get_next(seq, sk)))
2147                         --*pos;
2148         }
2149         return *pos ? NULL : sk;
2150 }
2151
2152 static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
2153 {
2154         void *rc;
2155         read_lock_bh(&dn_hash_lock);
2156         rc = socket_get_idx(seq, &pos);
2157         if (!rc) {
2158                 read_unlock_bh(&dn_hash_lock);
2159         }
2160         return rc;
2161 }
2162
2163 static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
2164 {
2165         return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2166 }
2167
2168 static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2169 {
2170         void *rc;
2171
2172         if (v == SEQ_START_TOKEN) {
2173                 rc = dn_socket_get_idx(seq, 0);
2174                 goto out;
2175         }
2176
2177         rc = dn_socket_get_next(seq, v);
2178         if (rc)
2179                 goto out;
2180         read_unlock_bh(&dn_hash_lock);
2181 out:
2182         ++*pos;
2183         return rc;
2184 }
2185
2186 static void dn_socket_seq_stop(struct seq_file *seq, void *v)
2187 {
2188         if (v && v != SEQ_START_TOKEN)
2189                 read_unlock_bh(&dn_hash_lock);
2190 }
2191
2192 #define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
2193
2194 static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
2195 {
2196         int i;
2197
2198         switch (dn_ntohs(dn->sdn_objnamel)) {
2199                 case 0:
2200                         sprintf(buf, "%d", dn->sdn_objnum);
2201                         break;
2202                 default:
2203                         for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
2204                                 buf[i] = dn->sdn_objname[i];
2205                                 if (IS_NOT_PRINTABLE(buf[i]))
2206                                         buf[i] = '.';
2207                         }
2208                         buf[i] = 0;
2209         }
2210 }
2211
2212 static char *dn_state2asc(unsigned char state)
2213 {
2214         switch(state) {
2215                 case DN_O:
2216                         return "OPEN";
2217                 case DN_CR:
2218                         return "  CR";
2219                 case DN_DR:
2220                         return "  DR";
2221                 case DN_DRC:
2222                         return " DRC";
2223                 case DN_CC:
2224                         return "  CC";
2225                 case DN_CI:
2226                         return "  CI";
2227                 case DN_NR:
2228                         return "  NR";
2229                 case DN_NC:
2230                         return "  NC";
2231                 case DN_CD:
2232                         return "  CD";
2233                 case DN_RJ:
2234                         return "  RJ";
2235                 case DN_RUN:
2236                         return " RUN";
2237                 case DN_DI:
2238                         return "  DI";
2239                 case DN_DIC:
2240                         return " DIC";
2241                 case DN_DN:
2242                         return "  DN";
2243                 case DN_CL:
2244                         return "  CL";
2245                 case DN_CN:
2246                         return "  CN";
2247         }
2248
2249         return "????";
2250 }
2251
2252 static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
2253 {
2254         struct dn_scp *scp = DN_SK(sk);
2255         char buf1[DN_ASCBUF_LEN];
2256         char buf2[DN_ASCBUF_LEN];
2257         char local_object[DN_MAXOBJL+3];
2258         char remote_object[DN_MAXOBJL+3];
2259
2260         dn_printable_object(&scp->addr, local_object);
2261         dn_printable_object(&scp->peer, remote_object);
2262
2263         seq_printf(seq,
2264                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
2265                    "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
2266                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
2267                    scp->addrloc,
2268                    scp->numdat,
2269                    scp->numoth,
2270                    scp->ackxmt_dat,
2271                    scp->ackxmt_oth,
2272                    scp->flowloc_sw,
2273                    local_object,
2274                    dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
2275                    scp->addrrem,
2276                    scp->numdat_rcv,
2277                    scp->numoth_rcv,
2278                    scp->ackrcv_dat,
2279                    scp->ackrcv_oth,
2280                    scp->flowrem_sw,
2281                    remote_object,
2282                    dn_state2asc(scp->state),
2283                    ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
2284 }
2285
2286 static int dn_socket_seq_show(struct seq_file *seq, void *v)
2287 {
2288         if (v == SEQ_START_TOKEN) {
2289                 seq_puts(seq, "Local                                              Remote\n");
2290         } else {
2291                 dn_socket_format_entry(seq, v);
2292         }
2293         return 0;
2294 }
2295
2296 static struct seq_operations dn_socket_seq_ops = {
2297         .start  = dn_socket_seq_start,
2298         .next   = dn_socket_seq_next,
2299         .stop   = dn_socket_seq_stop,
2300         .show   = dn_socket_seq_show,
2301 };
2302
2303 static int dn_socket_seq_open(struct inode *inode, struct file *file)
2304 {
2305         struct seq_file *seq;
2306         int rc = -ENOMEM;
2307         struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2308
2309         if (!s)
2310                 goto out;
2311
2312         rc = seq_open(file, &dn_socket_seq_ops);
2313         if (rc)
2314                 goto out_kfree;
2315
2316         seq             = file->private_data;
2317         seq->private    = s;
2318         memset(s, 0, sizeof(*s));
2319 out:
2320         return rc;
2321 out_kfree:
2322         kfree(s);
2323         goto out;
2324 }
2325
2326 static struct file_operations dn_socket_seq_fops = {
2327         .owner          = THIS_MODULE,
2328         .open           = dn_socket_seq_open,
2329         .read           = seq_read,
2330         .llseek         = seq_lseek,
2331         .release        = seq_release_private,
2332 };
2333 #endif
2334
2335 static struct net_proto_family  dn_family_ops = {
2336         .family =       AF_DECnet,
2337         .create =       dn_create,
2338         .owner  =       THIS_MODULE,
2339 };
2340
2341 static struct proto_ops dn_proto_ops = {
2342         .family =       AF_DECnet,
2343         .owner =        THIS_MODULE,
2344         .release =      dn_release,
2345         .bind =         dn_bind,
2346         .connect =      dn_connect,
2347         .socketpair =   sock_no_socketpair,
2348         .accept =       dn_accept,
2349         .getname =      dn_getname,
2350         .poll =         dn_poll,
2351         .ioctl =        dn_ioctl,
2352         .listen =       dn_listen,
2353         .shutdown =     dn_shutdown,
2354         .setsockopt =   dn_setsockopt,
2355         .getsockopt =   dn_getsockopt,
2356         .sendmsg =      dn_sendmsg,
2357         .recvmsg =      dn_recvmsg,
2358         .mmap =         sock_no_mmap,
2359         .sendpage =     sock_no_sendpage,
2360 };
2361
2362 void dn_register_sysctl(void);
2363 void dn_unregister_sysctl(void);
2364
2365 MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
2366 MODULE_AUTHOR("Linux DECnet Project Team");
2367 MODULE_LICENSE("GPL");
2368 MODULE_ALIAS_NETPROTO(PF_DECnet);
2369
2370 static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
2371
2372 static int __init decnet_init(void)
2373 {
2374         int rc;
2375
2376         printk(banner);
2377
2378         rc = proto_register(&dn_proto, 1);
2379         if (rc != 0)
2380                 goto out;
2381
2382         dn_neigh_init();
2383         dn_dev_init();
2384         dn_route_init();
2385         dn_fib_init();
2386
2387         sock_register(&dn_family_ops);
2388         dev_add_pack(&dn_dix_packet_type);
2389         register_netdevice_notifier(&dn_dev_notifier);
2390
2391         proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
2392         dn_register_sysctl();
2393 out:
2394         return rc;
2395
2396 }
2397 module_init(decnet_init);
2398
2399 /*
2400  * Prevent DECnet module unloading until its fixed properly.
2401  * Requires an audit of the code to check for memory leaks and
2402  * initialisation problems etc.
2403  */
2404 #if 0
2405 static void __exit decnet_exit(void)
2406 {
2407         sock_unregister(AF_DECnet);
2408         dev_remove_pack(&dn_dix_packet_type);
2409
2410         dn_unregister_sysctl();
2411
2412         unregister_netdevice_notifier(&dn_dev_notifier);
2413
2414         dn_route_cleanup();
2415         dn_dev_cleanup();
2416         dn_neigh_cleanup();
2417         dn_fib_cleanup();
2418
2419         proc_net_remove("decnet");
2420
2421         proto_unregister(&dn_proto);
2422 }
2423 module_exit(decnet_exit);
2424 #endif