net/decnet/dn_route.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 Routing Functions (Endnode and Router)
   8  *
   9  * Authors:     Steve Whitehouse <SteveW@ACM.org>
  10  *              Eduardo Marcelo Serrat <emserrat@geocities.com>
  11  *
  12  * Changes:
  13  *              Steve Whitehouse : Fixes to allow "intra-ethernet" and
  14  *                                 "return-to-sender" bits on outgoing
  15  *                                 packets.
  16  *              Steve Whitehouse : Timeouts for cached routes.
  17  *              Steve Whitehouse : Use dst cache for input routes too.
  18  *              Steve Whitehouse : Fixed error values in dn_send_skb.
  19  *              Steve Whitehouse : Rework routing functions to better fit
  20  *                                 DECnet routing design
  21  *              Alexey Kuznetsov : New SMP locking
  22  *              Steve Whitehouse : More SMP locking changes & dn_cache_dump()
  23  *              Steve Whitehouse : Prerouting NF hook, now really is prerouting.
  24  *                                 Fixed possible skb leak in rtnetlink funcs.
  25  *              Steve Whitehouse : Dave Miller's dynamic hash table sizing and
  26  *                                 Alexey Kuznetsov's finer grained locking
  27  *                                 from ipv4/route.c.
  28  *              Steve Whitehouse : Routing is now starting to look like a
  29  *                                 sensible set of code now, mainly due to
  30  *                                 my copying the IPv4 routing code. The
  31  *                                 hooks here are modified and will continue
  32  *                                 to evolve for a while.
  33  *              Steve Whitehouse : Real SMP at last :-) Also new netfilter
  34  *                                 stuff. Look out raw sockets your days
  35  *                                 are numbered!
  36  *              Steve Whitehouse : Added return-to-sender functions. Added
  37  *                                 backlog congestion level return codes.
  38  *              Steve Whitehouse : Fixed bug where routes were set up with
  39  *                                 no ref count on net devices.
  40  *
  41  */
  42
  43 /******************************************************************************
  44     (c) 1995-1998 E.M. Serrat           emserrat@geocities.com
  45
  46     This program is free software; you can redistribute it and/or modify
  47     it under the terms of the GNU General Public License as published by
  48     the Free Software Foundation; either version 2 of the License, or
  49     any later version.
  50
  51     This program is distributed in the hope that it will be useful,
  52     but WITHOUT ANY WARRANTY; without even the implied warranty of
  53     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  54     GNU General Public License for more details.
  55 *******************************************************************************/
  56
  57 #include <linux/config.h>
  58 #include <linux/errno.h>
  59 #include <linux/types.h>
  60 #include <linux/socket.h>
  61 #include <linux/in.h>
  62 #include <linux/kernel.h>
  63 #include <linux/sockios.h>
  64 #include <linux/net.h>
  65 #include <linux/netdevice.h>
  66 #include <linux/inet.h>
  67 #include <linux/route.h>
  68 #include <net/sock.h>
  69 #include <linux/fcntl.h>
  70 #include <linux/mm.h>
  71 #include <linux/proc_fs.h>
  72 #include <linux/init.h>
  73 #include <linux/rtnetlink.h>
  74 #include <linux/string.h>
  75 #include <linux/netfilter_decnet.h>
  76 #include <asm/errno.h>
  77 #include <net/neighbour.h>
  78 #include <net/dst.h>
  79 #include <net/dn.h>
  80 #include <net/dn_dev.h>
  81 #include <net/dn_nsp.h>
  82 #include <net/dn_route.h>
  83 #include <net/dn_neigh.h>
  84 #include <net/dn_fib.h>
  85
  86 struct dn_rt_hash_bucket
  87 {
  88         struct dn_route *chain;
  89         rwlock_t lock;
  90 } __attribute__((__aligned__(8)));
  91
  92 extern struct neigh_table dn_neigh_table;
  93
  94
  95 static unsigned char dn_hiord_addr[6] = {0xAA,0x00,0x04,0x00,0x00,0x00};
  96
  97 int dn_rt_min_delay = 2*HZ;
  98 int dn_rt_max_delay = 10*HZ;
  99 static unsigned long dn_rt_deadline = 0;
 100
 101 static int dn_dst_gc(void);
 102 static struct dst_entry *dn_dst_check(struct dst_entry *, __u32);
 103 static struct dst_entry *dn_dst_reroute(struct dst_entry *, struct sk_buff *skb);
 104 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);
 105 static void dn_dst_link_failure(struct sk_buff *);
 106 static int dn_route_input(struct sk_buff *);
 107 static void dn_run_flush(unsigned long dummy);
 108
 109 static struct dn_rt_hash_bucket *dn_rt_hash_table;
 110 static unsigned dn_rt_hash_mask;
 111
 112 static struct timer_list dn_route_timer;
 113 static struct timer_list dn_rt_flush_timer = { function: dn_run_flush };
 114 int decnet_dst_gc_interval = 2;
 115
 116 static struct dst_ops dn_dst_ops = {
 117         family:                 PF_DECnet,
 118         protocol:               __constant_htons(ETH_P_DNA_RT),
 119         gc_thresh:              128,
 120         gc:                     dn_dst_gc,
 121         check:                  dn_dst_check,
 122         reroute:                dn_dst_reroute,
 123         negative_advice:        dn_dst_negative_advice,
 124         link_failure:           dn_dst_link_failure,
 125         entry_size:             sizeof(struct dn_route),
 126         entries:                ATOMIC_INIT(0),
 127 };
 128
 129 static __inline__ unsigned dn_hash(unsigned short src, unsigned short dst)
 130 {
 131         unsigned short tmp = src ^ dst;
 132         tmp ^= (tmp >> 3);
 133         tmp ^= (tmp >> 5);
 134         tmp ^= (tmp >> 10);
 135         return dn_rt_hash_mask & (unsigned)tmp;
 136 }
 137
 138 static void SMP_TIMER_NAME(dn_dst_check_expire)(unsigned long dummy)
 139 {
 140         int i;
 141         struct dn_route *rt, **rtp;
 142         unsigned long now = jiffies;
 143         unsigned long expire = 120 * HZ;
 144
 145         for(i = 0; i <= dn_rt_hash_mask; i++) {
 146                 rtp = &dn_rt_hash_table[i].chain;
 147
 148                 write_lock(&dn_rt_hash_table[i].lock);
 149                 while((rt=*rtp) != NULL) {
 150                         if (atomic_read(&rt->u.dst.__refcnt) ||
 151                                         (now - rt->u.dst.lastuse) < expire) {
 152                                 rtp = &rt->u.rt_next;
 153                                 continue;
 154                         }
 155                         *rtp = rt->u.rt_next;
 156                         rt->u.rt_next = NULL;
 157                         dst_free(&rt->u.dst);
 158                 }
 159                 write_unlock(&dn_rt_hash_table[i].lock);
 160
 161                 if ((jiffies - now) > 0)
 162                         break;
 163         }
 164
 165         mod_timer(&dn_route_timer, now + decnet_dst_gc_interval * HZ);
 166 }
 167
 168 SMP_TIMER_DEFINE(dn_dst_check_expire, dn_dst_task);
 169
 170 static int dn_dst_gc(void)
 171 {
 172         struct dn_route *rt, **rtp;
 173         int i;
 174         unsigned long now = jiffies;
 175         unsigned long expire = 10 * HZ;
 176
 177         for(i = 0; i <= dn_rt_hash_mask; i++) {
 178
 179                 write_lock_bh(&dn_rt_hash_table[i].lock);
 180                 rtp = &dn_rt_hash_table[i].chain;
 181
 182                 while((rt=*rtp) != NULL) {
 183                         if (atomic_read(&rt->u.dst.__refcnt) ||
 184                                         (now - rt->u.dst.lastuse) < expire) {
 185                                 rtp = &rt->u.rt_next;
 186                                 continue;
 187                         }
 188                         *rtp = rt->u.rt_next;
 189                         rt->u.rt_next = NULL;
 190                         dst_free(&rt->u.dst);
 191                         break;
 192                 }
 193                 write_unlock_bh(&dn_rt_hash_table[i].lock);
 194         }
 195
 196         return 0;
 197 }
 198
 199 static struct dst_entry *dn_dst_check(struct dst_entry *dst, __u32 cookie)
 200 {
 201         dst_release(dst);
 202         return NULL;
 203 }
 204
 205 static struct dst_entry *dn_dst_reroute(struct dst_entry *dst,
 206                                         struct sk_buff *skb)
 207 {
 208         return NULL;
 209 }
 210
 211 /*
 212  * This is called through sendmsg() when you specify MSG_TRYHARD
 213  * and there is already a route in cache.
 214  */
 215 static struct dst_entry *dn_dst_negative_advice(struct dst_entry *dst)
 216 {
 217         dst_release(dst);
 218         return NULL;
 219 }
 220
 221 static void dn_dst_link_failure(struct sk_buff *skb)
 222 {
 223         return;
 224 }
 225
 226 static void dn_insert_route(struct dn_route *rt, unsigned hash)
 227 {
 228         unsigned long now = jiffies;
 229
 230         write_lock_bh(&dn_rt_hash_table[hash].lock);
 231         rt->u.rt_next = dn_rt_hash_table[hash].chain;
 232         dn_rt_hash_table[hash].chain = rt;
 233
 234         dst_hold(&rt->u.dst);
 235         rt->u.dst.__use++;
 236         rt->u.dst.lastuse = now;
 237
 238         write_unlock_bh(&dn_rt_hash_table[hash].lock);
 239 }
 240
 241 void SMP_TIMER_NAME(dn_run_flush)(unsigned long dummy)
 242 {
 243         int i;
 244         struct dn_route *rt, *next;
 245
 246         for(i = 0; i < dn_rt_hash_mask; i++) {
 247                 write_lock_bh(&dn_rt_hash_table[i].lock);
 248
 249                 if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL)
 250                         goto nothing_to_declare;
 251
 252                 for(; rt; rt=next) {
 253                         next = rt->u.rt_next;
 254                         rt->u.rt_next = NULL;
 255                         dst_free((struct dst_entry *)rt);
 256                 }
 257
 258 nothing_to_declare:
 259                 write_unlock_bh(&dn_rt_hash_table[i].lock);
 260         }
 261 }
 262
 263 SMP_TIMER_DEFINE(dn_run_flush, dn_flush_task);
 264
 265 static spinlock_t dn_rt_flush_lock = SPIN_LOCK_UNLOCKED;
 266
 267 void dn_rt_cache_flush(int delay)
 268 {
 269         unsigned long now = jiffies;
 270         int user_mode = !in_interrupt();
 271
 272         if (delay < 0)
 273                 delay = dn_rt_min_delay;
 274
 275         spin_lock_bh(&dn_rt_flush_lock);
 276
 277         if (del_timer(&dn_rt_flush_timer) && delay > 0 && dn_rt_deadline) {
 278                 long tmo = (long)(dn_rt_deadline - now);
 279
 280                 if (user_mode && tmo < dn_rt_max_delay - dn_rt_min_delay)
 281                         tmo = 0;
 282
 283                 if (delay > tmo)
 284                         delay = tmo;
 285         }
 286
 287         if (delay <= 0) {
 288                 spin_unlock_bh(&dn_rt_flush_lock);
 289                 dn_run_flush(0);
 290                 return;
 291         }
 292
 293         if (dn_rt_deadline == 0)
 294                 dn_rt_deadline = now + dn_rt_max_delay;
 295
 296         dn_rt_flush_timer.expires = now + delay;
 297         add_timer(&dn_rt_flush_timer);
 298         spin_unlock_bh(&dn_rt_flush_lock);
 299 }
 300
 301 /**
 302  * dn_return_short - Return a short packet to its sender
 303  * @skb: The packet to return
 304  *
 305  */
 306 static int dn_return_short(struct sk_buff *skb)
 307 {
 308         struct dn_skb_cb *cb;
 309         unsigned char *ptr;
 310         dn_address *src;
 311         dn_address *dst;
 312         dn_address tmp;
 313
 314         /* Add back headers */
 315         skb_push(skb, skb->data - skb->nh.raw);
 316
 317         if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
 318                 return NET_RX_DROP;
 319
 320         cb = DN_SKB_CB(skb);
 321         /* Skip packet length and point to flags */
 322         ptr = skb->data + 2;
 323         *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
 324
 325         dst = (dn_address *)ptr;
 326         ptr += 2;
 327         src = (dn_address *)ptr;
 328         ptr += 2;
 329         *ptr = 0; /* Zero hop count */
 330
 331         /* Swap source and destination */
 332         tmp  = *src;
 333         *src = *dst;
 334         *dst = tmp;
 335
 336         skb->pkt_type = PACKET_OUTGOING;
 337         dn_rt_finish_output(skb, NULL);
 338         return NET_RX_SUCCESS;
 339 }
 340
 341 /**
 342  * dn_return_long - Return a long packet to its sender
 343  * @skb: The long format packet to return
 344  *
 345  */
 346 static int dn_return_long(struct sk_buff *skb)
 347 {
 348         struct dn_skb_cb *cb;
 349         unsigned char *ptr;
 350         unsigned char *src_addr, *dst_addr;
 351         unsigned char tmp[ETH_ALEN];
 352
 353         /* Add back all headers */
 354         skb_push(skb, skb->data - skb->nh.raw);
 355
 356         if ((skb = skb_unshare(skb, GFP_ATOMIC)) == NULL)
 357                 return NET_RX_DROP;
 358
 359         cb = DN_SKB_CB(skb);
 360         /* Ignore packet length and point to flags */
 361         ptr = skb->data + 2;
 362
 363         /* Skip padding */
 364         if (*ptr & DN_RT_F_PF) {
 365                 char padlen = (*ptr & ~DN_RT_F_PF);
 366                 ptr += padlen;
 367         }
 368
 369         *ptr++ = (cb->rt_flags & ~DN_RT_F_RQR) | DN_RT_F_RTS;
 370         ptr += 2;
 371         dst_addr = ptr;
 372         ptr += 8;
 373         src_addr = ptr;
 374         ptr += 6;
 375         *ptr = 0; /* Zero hop count */
 376
 377         /* Swap source and destination */
 378         memcpy(tmp, src_addr, ETH_ALEN);
 379         memcpy(src_addr, dst_addr, ETH_ALEN);
 380         memcpy(dst_addr, tmp, ETH_ALEN);
 381
 382         skb->pkt_type = PACKET_OUTGOING;
 383         dn_rt_finish_output(skb, tmp);
 384         return NET_RX_SUCCESS;
 385 }
 386
 387 /**
 388  * dn_route_rx_packet - Try and find a route for an incoming packet
 389  * @skb: The packet to find a route for
 390  *
 391  * Returns: result of input function if route is found, error code otherwise
 392  */
 393 static int dn_route_rx_packet(struct sk_buff *skb)
 394 {
 395         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 396         int err;
 397
 398         if ((err = dn_route_input(skb)) == 0)
 399                 return skb->dst->input(skb);
 400
 401         if (decnet_debug_level & 4) {
 402                 char *devname = skb->dev ? skb->dev->name : "???";
 403                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
 404                 printk(KERN_DEBUG
 405                         "DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
 406                         (int)cb->rt_flags, devname, skb->len, cb->src, cb->dst,
 407                         err, skb->pkt_type);
 408         }
 409
 410         if ((skb->pkt_type == PACKET_HOST) && (cb->rt_flags & DN_RT_F_RQR)) {
 411                 switch(cb->rt_flags & DN_RT_PKT_MSK) {
 412                         case DN_RT_PKT_SHORT:
 413                                 return dn_return_short(skb);
 414                         case DN_RT_PKT_LONG:
 415                                 return dn_return_long(skb);
 416                 }
 417         }
 418
 419         kfree_skb(skb);
 420         return NET_RX_DROP;
 421 }
 422
 423 static int dn_route_rx_long(struct sk_buff *skb)
 424 {
 425         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 426         unsigned char *ptr = skb->data;
 427
 428         if (skb->len < 21) /* 20 for long header, 1 for shortest nsp */
 429                 goto drop_it;
 430
 431         skb_pull(skb, 20);
 432         skb->h.raw = skb->data;
 433
 434         /* Destination info */
 435         ptr += 2;
 436         cb->dst = dn_htons(dn_eth2dn(ptr));
 437         if (memcmp(ptr, dn_hiord_addr, 4) != 0)
 438                 goto drop_it;
 439         ptr += 6;
 440
 441
 442         /* Source info */
 443         ptr += 2;
 444         cb->src = dn_htons(dn_eth2dn(ptr));
 445         if (memcmp(ptr, dn_hiord_addr, 4) != 0)
 446                 goto drop_it;
 447         ptr += 6;
 448         /* Other junk */
 449         ptr++;
 450         cb->hops = *ptr++; /* Visit Count */
 451
 452         return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
 453
 454 drop_it:
 455         kfree_skb(skb);
 456         return NET_RX_DROP;
 457 }
 458
 459
 460
 461 static int dn_route_rx_short(struct sk_buff *skb)
 462 {
 463         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 464         unsigned char *ptr = skb->data;
 465
 466         if (skb->len < 6) /* 5 for short header + 1 for shortest nsp */
 467                 goto drop_it;
 468
 469         skb_pull(skb, 5);
 470         skb->h.raw = skb->data;
 471
 472         cb->dst = *(dn_address *)ptr;
 473         ptr += 2;
 474         cb->src = *(dn_address *)ptr;
 475         ptr += 2;
 476         cb->hops = *ptr & 0x3f;
 477
 478         return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet);
 479
 480 drop_it:
 481         kfree_skb(skb);
 482         return NET_RX_DROP;
 483 }
 484
 485 static int dn_route_discard(struct sk_buff *skb)
 486 {
 487         /*
 488          * I know we drop the packet here, but thats considered success in
 489          * this case
 490          */
 491         kfree_skb(skb);
 492         return NET_RX_SUCCESS;
 493 }
 494
 495 static int dn_route_ptp_hello(struct sk_buff *skb)
 496 {
 497         dn_dev_hello(skb);
 498         dn_neigh_pointopoint_hello(skb);
 499         return NET_RX_SUCCESS;
 500 }
 501
 502 int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
 503 {
 504         struct dn_skb_cb *cb;
 505         unsigned char flags = 0;
 506         __u16 len = dn_ntohs(*(__u16 *)skb->data);
 507         struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr;
 508         unsigned char padlen = 0;
 509
 510         if (dn == NULL)
 511                 goto dump_it;
 512
 513         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 514                 goto out;
 515
 516         skb_pull(skb, 2);
 517
 518         if (len > skb->len)
 519                 goto dump_it;
 520
 521         skb_trim(skb, len);
 522
 523         flags = *skb->data;
 524
 525         cb = DN_SKB_CB(skb);
 526         cb->stamp = jiffies;
 527         cb->iif = dev->ifindex;
 528
 529         /*
 530          * If we have padding, remove it.
 531          */
 532         if (flags & DN_RT_F_PF) {
 533                 padlen = flags & ~DN_RT_F_PF;
 534                 skb_pull(skb, padlen);
 535                 flags = *skb->data;
 536         }
 537
 538         skb->nh.raw = skb->data;
 539
 540         /*
 541          * Weed out future version DECnet
 542          */
 543         if (flags & DN_RT_F_VER)
 544                 goto dump_it;
 545
 546         cb->rt_flags = flags;
 547
 548         if (decnet_debug_level & 1)
 549                 printk(KERN_DEBUG
 550                         "dn_route_rcv: got 0x%02x from %s [%d %d %d]\n",
 551                         (int)flags, (dev) ? dev->name : "???", len, skb->len,
 552                         padlen);
 553
 554         if (flags & DN_RT_PKT_CNTL) {
 555                 switch(flags & DN_RT_CNTL_MSK) {
 556                         case DN_RT_PKT_INIT:
 557                                 dn_dev_init_pkt(skb);
 558                                 break;
 559                         case DN_RT_PKT_VERI:
 560                                 dn_dev_veri_pkt(skb);
 561                                 break;
 562                 }
 563
 564                 if (dn->parms.state != DN_DEV_S_RU)
 565                         goto dump_it;
 566
 567                 switch(flags & DN_RT_CNTL_MSK) {
 568                         case DN_RT_PKT_HELO:
 569                                 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_route_ptp_hello);
 570
 571                         case DN_RT_PKT_L1RT:
 572                         case DN_RT_PKT_L2RT:
 573                                 return NF_HOOK(PF_DECnet, NF_DN_ROUTE, skb, skb->dev, NULL, dn_route_discard);
 574                         case DN_RT_PKT_ERTH:
 575                                 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_router_hello);
 576
 577                         case DN_RT_PKT_EEDH:
 578                                 return NF_HOOK(PF_DECnet, NF_DN_HELLO, skb, skb->dev, NULL, dn_neigh_endnode_hello);
 579                 }
 580         } else {
 581                 if (dn->parms.state != DN_DEV_S_RU)
 582                         goto dump_it;
 583
 584                 skb_pull(skb, 1); /* Pull flags */
 585
 586                 switch(flags & DN_RT_PKT_MSK) {
 587                         case DN_RT_PKT_LONG:
 588                                 return dn_route_rx_long(skb);
 589                         case DN_RT_PKT_SHORT:
 590                                 return dn_route_rx_short(skb);
 591                 }
 592         }
 593
 594 dump_it:
 595         kfree_skb(skb);
 596 out:
 597         return NET_RX_DROP;
 598 }
 599
 600 static int dn_output(struct sk_buff *skb)
 601 {
 602         struct dst_entry *dst = skb->dst;
 603         struct dn_route *rt = (struct dn_route *)dst;
 604         struct net_device *dev = dst->dev;
 605         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 606         struct neighbour *neigh;
 607
 608         int err = -EINVAL;
 609
 610         if ((neigh = dst->neighbour) == NULL)
 611                 goto error;
 612
 613         skb->dev = dev;
 614
 615         cb->src = rt->rt_saddr;
 616         cb->dst = rt->rt_daddr;
 617
 618         /*
 619          * Always set the Intra-Ethernet bit on all outgoing packets
 620          * originated on this node. Only valid flag from upper layers
 621          * is return-to-sender-requested. Set hop count to 0 too.
 622          */
 623         cb->rt_flags &= ~DN_RT_F_RQR;
 624         cb->rt_flags |= DN_RT_F_IE;
 625         cb->hops = 0;
 626
 627         return NF_HOOK(PF_DECnet, NF_DN_LOCAL_OUT, skb, NULL, dev, neigh->output);
 628
 629 error:
 630         if (net_ratelimit())
 631                 printk(KERN_DEBUG "dn_output: This should not happen\n");
 632
 633         kfree_skb(skb);
 634
 635         return err;
 636 }
 637
 638 #ifdef CONFIG_DECNET_ROUTER
 639 static int dn_forward(struct sk_buff *skb)
 640 {
 641         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 642         struct dst_entry *dst = skb->dst;
 643         struct neighbour *neigh;
 644         struct net_device *dev = skb->dev;
 645         int err = -EINVAL;
 646
 647         if ((neigh = dst->neighbour) == NULL)
 648                 goto error;
 649
 650         /*
 651          * Hop count exceeded.
 652          */
 653         err = NET_RX_DROP;
 654         if (++cb->hops > 30)
 655                 goto drop;
 656
 657         skb->dev = dst->dev;
 658
 659         /*
 660          * If packet goes out same interface it came in on, then set
 661          * the Intra-Ethernet bit. This has no effect for short
 662          * packets, so we don't need to test for them here.
 663          */
 664         if (cb->iif == dst->dev->ifindex)
 665                 cb->rt_flags |= DN_RT_F_IE;
 666         else
 667                 cb->rt_flags &= ~DN_RT_F_IE;
 668
 669         return NF_HOOK(PF_DECnet, NF_DN_FORWARD, skb, dev, skb->dev, neigh->output);
 670
 671
 672 error:
 673         if (net_ratelimit())
 674                 printk(KERN_DEBUG "dn_forward: This should not happen\n");
 675 drop:
 676         kfree_skb(skb);
 677
 678         return err;
 679 }
 680 #endif
 681
 682 /*
 683  * Drop packet. This is used for endnodes and for
 684  * when we should not be forwarding packets from
 685  * this dest.
 686  */
 687 static int dn_blackhole(struct sk_buff *skb)
 688 {
 689         kfree_skb(skb);
 690         return NET_RX_DROP;
 691 }
 692
 693 /*
 694  * Used to catch bugs. This should never normally get
 695  * called.
 696  */
 697 static int dn_rt_bug(struct sk_buff *skb)
 698 {
 699         if (net_ratelimit()) {
 700                 struct dn_skb_cb *cb = DN_SKB_CB(skb);
 701
 702                 printk(KERN_DEBUG "dn_rt_bug: skb from:%04x to:%04x\n",
 703                                 cb->src, cb->dst);
 704         }
 705
 706         kfree_skb(skb);
 707
 708         return NET_RX_BAD;
 709 }
 710
 711 static int dn_route_output_slow(struct dst_entry **pprt, dn_address dst, dn_address src, int flags)
 712 {
 713         struct dn_route *rt = NULL;
 714         struct net_device *dev = decnet_default_device;
 715         struct neighbour *neigh = NULL;
 716         struct dn_dev *dn_db;
 717         unsigned hash;
 718 #ifdef CONFIG_DECNET_ROUTER
 719         struct dn_fib_key key;
 720         struct dn_fib_res res;
 721         int err;
 722
 723         key.src = src;
 724         key.dst = dst;
 725         key.iif = 0;
 726         key.oif = 0;
 727         key.fwmark = 0;
 728         key.scope = RT_SCOPE_UNIVERSE;
 729
 730         if ((err = dn_fib_lookup(&key, &res)) == 0) {
 731                 switch(res.type) {
 732                         case RTN_UNICAST:
 733                                 /*
 734                                  * This method of handling multipath
 735                                  * routes is a hack and will change.
 736                                  * It works for now though.
 737                                  */
 738                                 if (res.fi->fib_nhs)
 739                                         dn_fib_select_multipath(&key, &res);
 740                                 neigh = __neigh_lookup(&dn_neigh_table, &DN_FIB_RES_GW(res), DN_FIB_RES_DEV(res), 1);
 741                                 err = -ENOBUFS;
 742                                 if (!neigh)
 743                                         break;
 744                                 err = 0;
 745                                 break;
 746                         case RTN_UNREACHABLE:
 747                                 err = -EHOSTUNREACH;
 748                                 break;
 749                         default:
 750                                 err = -EINVAL;
 751                 }
 752                 dn_fib_res_put(&res);
 753                 if (err < 0)
 754                         return err;
 755                 goto got_route;
 756         }
 757
 758         if (err != -ESRCH)
 759                 return err;
 760 #endif
 761
 762         /* Look in On-Ethernet cache first */
 763         if (!(flags & MSG_TRYHARD)) {
 764                 if ((neigh = dn_neigh_lookup(&dn_neigh_table, &dst)) != NULL)
 765                         goto got_route;
 766         }
 767
 768         if (dev == NULL)
 769                 return -EINVAL;
 770
 771         dn_db = dev->dn_ptr;
 772
 773         if (dn_db == NULL)
 774                 return -EINVAL;
 775
 776         /* Try default router */
 777         if ((neigh = neigh_clone(dn_db->router)) != NULL)
 778                 goto got_route;
 779
 780         /* Send to default device (and hope for the best) if above fail */
 781         if ((neigh = __neigh_lookup(&dn_neigh_table, &dst, dev, 1)) != NULL)
 782                 goto got_route;
 783
 784
 785         return -EINVAL;
 786
 787 got_route:
 788
 789         if ((rt = dst_alloc(&dn_dst_ops)) == NULL) {
 790                 neigh_release(neigh);
 791                 return -EINVAL;
 792         }
 793
 794         dn_db = (struct dn_dev *)neigh->dev->dn_ptr;
 795
 796         rt->key.saddr  = src;
 797         rt->rt_saddr   = src;
 798         rt->key.daddr  = dst;
 799         rt->rt_daddr   = dst;
 800         rt->key.oif    = neigh ? neigh->dev->ifindex : -1;
 801         rt->key.iif    = 0;
 802         rt->key.fwmark = 0;
 803
 804         rt->u.dst.neighbour = neigh;
 805         rt->u.dst.dev = neigh ? neigh->dev : NULL;
 806         if (rt->u.dst.dev)
 807                 dev_hold(rt->u.dst.dev);
 808         rt->u.dst.lastuse = jiffies;
 809         rt->u.dst.output = dn_output;
 810         rt->u.dst.input  = dn_rt_bug;
 811
 812         if (dn_dev_islocal(neigh->dev, rt->rt_daddr))
 813                 rt->u.dst.input = dn_nsp_rx;
 814
 815         hash = dn_hash(rt->key.saddr, rt->key.daddr);
 816         dn_insert_route(rt, hash);
 817         *pprt = &rt->u.dst;
 818
 819         return 0;
 820 }
 821
 822 int dn_route_output(struct dst_entry **pprt, dn_address dst, dn_address src, int flags)
 823 {
 824         unsigned hash = dn_hash(src, dst);
 825         struct dn_route *rt = NULL;
 826
 827         if (!(flags & MSG_TRYHARD)) {
 828                 read_lock_bh(&dn_rt_hash_table[hash].lock);
 829                 for(rt = dn_rt_hash_table[hash].chain; rt; rt = rt->u.rt_next) {
 830                         if ((dst == rt->key.daddr) &&
 831                                         (src == rt->key.saddr) &&
 832                                         (rt->key.iif == 0) &&
 833                                         (rt->key.oif != 0)) {
 834                                 rt->u.dst.lastuse = jiffies;
 835                                 dst_hold(&rt->u.dst);
 836                                 rt->u.dst.__use++;
 837                                 read_unlock_bh(&dn_rt_hash_table[hash].lock);
 838                                 *pprt = &rt->u.dst;
 839                                 return 0;
 840                         }
 841                 }
 842                 read_unlock_bh(&dn_rt_hash_table[hash].lock);
 843         }
 844
 845         return dn_route_output_slow(pprt, dst, src, flags);
 846 }
 847
 848 static int dn_route_input_slow(struct sk_buff *skb)
 849 {
 850         struct dn_route *rt = NULL;
 851         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 852         struct net_device *dev = skb->dev;
 853         struct dn_dev *dn_db;
 854         struct neighbour *neigh = NULL;
 855         int (*dnrt_input)(struct sk_buff *skb);
 856         int (*dnrt_output)(struct sk_buff *skb);
 857         u32 fwmark = 0;
 858         unsigned hash;
 859         dn_address saddr = cb->src;
 860         dn_address daddr = cb->dst;
 861 #ifdef CONFIG_DECNET_ROUTER
 862         struct dn_fib_key key;
 863         struct dn_fib_res res;
 864         int err;
 865 #endif
 866
 867         if (dev == NULL)
 868                 return -EINVAL;
 869
 870         if ((dn_db = dev->dn_ptr) == NULL)
 871                 return -EINVAL;
 872
 873         /*
 874          * In this case we've just received a packet from a source
 875          * outside ourselves pretending to come from us. We don't
 876          * allow it any further to prevent routing loops, spoofing and
 877          * other nasties. Loopback packets already have the dst attached
 878          * so this only affects packets which have originated elsewhere.
 879          */
 880         if (dn_dev_islocal(dev, cb->src))
 881                 return -ENOTUNIQ;
 882
 883         /*
 884          * Default is to create a drop everything entry
 885          */
 886         dnrt_input  = dn_blackhole;
 887         dnrt_output = dn_rt_bug;
 888
 889         /*
 890          * Is the destination us ?
 891          */
 892         if (!dn_dev_islocal(dev, cb->dst))
 893                 goto non_local_input;
 894
 895         /*
 896          * Local input... find source of skb
 897          */
 898         dnrt_input  = dn_nsp_rx;
 899         dnrt_output = dn_output;
 900         saddr = cb->dst;
 901         daddr = cb->src;
 902
 903         if ((neigh = neigh_lookup(&dn_neigh_table, &cb->src, dev)) != NULL)
 904                 goto add_entry;
 905
 906         if (dn_db->router && ((neigh = neigh_clone(dn_db->router)) != NULL))
 907                 goto add_entry;
 908
 909         neigh = neigh_create(&dn_neigh_table, &cb->src, dev);
 910         if (!IS_ERR(neigh)) {
 911                 if (dev->type == ARPHRD_ETHER)
 912                         memcpy(neigh->ha, skb->mac.ethernet->h_source, ETH_ALEN);
 913                 goto add_entry;
 914         }
 915
 916         return PTR_ERR(neigh);
 917
 918 non_local_input:
 919
 920 #ifdef CONFIG_DECNET_ROUTER
 921         /*
 922          * Destination is another node... find next hop in
 923          * routing table here.
 924          */
 925
 926         key.src = cb->src;
 927         key.dst = cb->dst;
 928         key.iif = dev->ifindex;
 929         key.oif = 0;
 930         key.scope = RT_SCOPE_UNIVERSE;
 931
 932 #ifdef CONFIG_DECNET_ROUTE_FWMARK
 933         key.fwmark = skb->nfmark;
 934 #else
 935         key.fwmark = 0;
 936 #endif
 937
 938         if ((err = dn_fib_lookup(&key, &res)) == 0) {
 939                 switch(res.type) {
 940                         case RTN_UNICAST:
 941                                 if (res.fi->fib_nhs)
 942                                         dn_fib_select_multipath(&key, &res);
 943                                 neigh = __neigh_lookup(&dn_neigh_table, &DN_FIB_RES_GW(res), DN_FIB_RES_DEV(res), 1);
 944                                 err = -ENOBUFS;
 945                                 if (!neigh)
 946                                         break;
 947                                 err = 0;
 948                                 dnrt_input = dn_forward;
 949                                 fwmark = key.fwmark;
 950                                 break;
 951                         case RTN_UNREACHABLE:
 952                                 dnrt_input = dn_blackhole;
 953                                 fwmark = key.fwmark;
 954                                 break;
 955                         default:
 956                                 err = -EINVAL;
 957                 }
 958                 dn_fib_res_put(&res);
 959                 if (err < 0)
 960                         return err;
 961                 goto add_entry;
 962         }
 963
 964         return err;
 965
 966 #endif /* CONFIG_DECNET_ROUTER */
 967
 968 add_entry:
 969
 970         if ((rt = dst_alloc(&dn_dst_ops)) == NULL) {
 971                 neigh_release(neigh);
 972                 return -EINVAL;
 973         }
 974
 975         rt->key.saddr  = cb->src;
 976         rt->rt_saddr   = saddr;
 977         rt->key.daddr  = cb->dst;
 978         rt->rt_daddr   = daddr;
 979         rt->key.oif    = 0;
 980         rt->key.iif    = dev->ifindex;
 981         rt->key.fwmark = fwmark;
 982
 983         rt->u.dst.neighbour = neigh;
 984         rt->u.dst.dev = neigh ? neigh->dev : NULL;
 985         if (rt->u.dst.dev)
 986                 dev_hold(rt->u.dst.dev);
 987         rt->u.dst.lastuse = jiffies;
 988         rt->u.dst.output = dnrt_output;
 989         rt->u.dst.input = dnrt_input;
 990
 991         hash = dn_hash(rt->key.saddr, rt->key.daddr);
 992         dn_insert_route(rt, hash);
 993         skb->dst = (struct dst_entry *)rt;
 994
 995         return 0;
 996 }
 997
 998 int dn_route_input(struct sk_buff *skb)
 999 {
1000         struct dn_route *rt;
1001         struct dn_skb_cb *cb = DN_SKB_CB(skb);
1002         unsigned hash = dn_hash(cb->src, cb->dst);
1003
1004         if (skb->dst)
1005                 return 0;
1006
1007         read_lock(&dn_rt_hash_table[hash].lock);
1008         for(rt = dn_rt_hash_table[hash].chain; rt != NULL; rt = rt->u.rt_next) {
1009                 if ((rt->key.saddr == cb->src) &&
1010                                 (rt->key.daddr == cb->dst) &&
1011                                 (rt->key.oif == 0) &&
1012 #ifdef CONFIG_DECNET_ROUTE_FWMARK
1013                                 (rt->key.fwmark == skb->nfmark) &&
1014 #endif
1015                                 (rt->key.iif == cb->iif)) {
1016                         rt->u.dst.lastuse = jiffies;
1017                         dst_hold(&rt->u.dst);
1018                         rt->u.dst.__use++;
1019                         read_unlock(&dn_rt_hash_table[hash].lock);
1020                         skb->dst = (struct dst_entry *)rt;
1021                         return 0;
1022                 }
1023         }
1024         read_unlock(&dn_rt_hash_table[hash].lock);
1025
1026         return dn_route_input_slow(skb);
1027 }
1028
1029 static int dn_rt_fill_info(struct sk_buff *skb, u32 pid, u32 seq, int event, int nowait)
1030 {
1031         struct dn_route *rt = (struct dn_route *)skb->dst;
1032         struct rtmsg *r;
1033         struct nlmsghdr *nlh;
1034         unsigned char *b = skb->tail;
1035
1036         nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*r));
1037         r = NLMSG_DATA(nlh);
1038         nlh->nlmsg_flags = nowait ? NLM_F_MULTI : 0;
1039         r->rtm_family = AF_DECnet;
1040         r->rtm_dst_len = 16;
1041         r->rtm_src_len = 16;
1042         r->rtm_tos = 0;
1043         r->rtm_table = 0;
1044         r->rtm_type = 0;
1045         r->rtm_flags = 0;
1046         r->rtm_scope = RT_SCOPE_UNIVERSE;
1047         r->rtm_protocol = RTPROT_UNSPEC;
1048         RTA_PUT(skb, RTA_DST, 2, &rt->rt_daddr);
1049         RTA_PUT(skb, RTA_SRC, 2, &rt->rt_saddr);
1050         if (rt->u.dst.dev)
1051                 RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->u.dst.dev->ifindex);
1052         if (rt->u.dst.window)
1053                 RTA_PUT(skb, RTAX_WINDOW, sizeof(unsigned), &rt->u.dst.window);
1054         if (rt->u.dst.rtt)
1055                 RTA_PUT(skb, RTAX_RTT, sizeof(unsigned), &rt->u.dst.rtt);
1056
1057         nlh->nlmsg_len = skb->tail - b;
1058         return skb->len;
1059
1060 nlmsg_failure:
1061 rtattr_failure:
1062         skb_trim(skb, b - skb->data);
1063         return -1;
1064 }
1065
1066 /*
1067  * This is called by both endnodes and routers now.
1068  */
1069 int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, void *arg)
1070 {
1071         struct rtattr **rta = arg;
1072         struct dn_route *rt = NULL;
1073         struct dn_skb_cb *cb;
1074         dn_address dst = 0;
1075         dn_address src = 0;
1076         int iif = 0;
1077         int err;
1078         struct sk_buff *skb;
1079
1080         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1081         if (skb == NULL)
1082                 return -ENOBUFS;
1083         skb->mac.raw = skb->data;
1084         cb = DN_SKB_CB(skb);
1085
1086         if (rta[RTA_SRC-1])
1087                 memcpy(&src, RTA_DATA(rta[RTA_SRC-1]), 2);
1088         if (rta[RTA_DST-1])
1089                 memcpy(&dst, RTA_DATA(rta[RTA_DST-1]), 2);
1090         if (rta[RTA_IIF-1])
1091                 memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
1092
1093         if (iif) {
1094                 struct net_device *dev;
1095                 if ((dev = dev_get_by_index(iif)) == NULL) {
1096                         kfree_skb(skb);
1097                         return -ENODEV;
1098                 }
1099                 if (!dev->dn_ptr) {
1100                         dev_put(dev);
1101                         kfree_skb(skb);
1102                         return -ENODEV;
1103                 }
1104                 skb->protocol = __constant_htons(ETH_P_DNA_RT);
1105                 skb->dev = dev;
1106                 cb->src = src;
1107                 cb->dst = dst;
1108                 local_bh_disable();
1109                 err = dn_route_input(skb);
1110                 local_bh_enable();
1111                 memset(cb, 0, sizeof(struct dn_skb_cb));
1112                 rt = (struct dn_route *)skb->dst;
1113         } else {
1114                 err = dn_route_output((struct dst_entry **)&rt, dst, src, 0);
1115         }
1116
1117         if (!err && rt->u.dst.error)
1118                 err = rt->u.dst.error;
1119         if (skb->dev)
1120                 dev_put(skb->dev);
1121         skb->dev = NULL;
1122         if (err)
1123                 goto out_free;
1124         skb->dst = &rt->u.dst;
1125
1126         NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
1127
1128         err = dn_rt_fill_info(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWROUTE, 0);
1129
1130         if (err == 0)
1131                 goto out_free;
1132         if (err < 0) {
1133                 err = -EMSGSIZE;
1134                 goto out_free;
1135         }
1136
1137         err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
1138
1139         return err;
1140
1141 out_free:
1142         kfree_skb(skb);
1143         return err;
1144 }
1145
1146 /*
1147  * For routers, this is called from dn_fib_dump, but for endnodes its
1148  * called directly from the rtnetlink dispatch table.
1149  */
1150 int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
1151 {
1152         struct dn_route *rt;
1153         int h, s_h;
1154         int idx, s_idx;
1155
1156         if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg))
1157                 return -EINVAL;
1158         if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED))
1159                 return 0;
1160
1161         s_h = cb->args[0];
1162         s_idx = idx = cb->args[1];
1163         for(h = 0; h <= dn_rt_hash_mask; h++) {
1164                 if (h < s_h)
1165                         continue;
1166                 if (h > s_h)
1167                         s_idx = 0;
1168                 read_lock_bh(&dn_rt_hash_table[h].lock);
1169                 for(rt = dn_rt_hash_table[h].chain, idx = 0; rt; rt = rt->u.rt_next, idx++) {
1170                         if (idx < s_idx)
1171                                 continue;
1172                         skb->dst = dst_clone(&rt->u.dst);
1173                         if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
1174                                         cb->nlh->nlmsg_seq, RTM_NEWROUTE, 1) <= 0) {
1175                                 dst_release(xchg(&skb->dst, NULL));
1176                                 read_unlock_bh(&dn_rt_hash_table[h].lock);
1177                                 goto done;
1178                         }
1179                         dst_release(xchg(&skb->dst, NULL));
1180                 }
1181                 read_unlock_bh(&dn_rt_hash_table[h].lock);
1182         }
1183
1184 done:
1185         cb->args[0] = h;
1186         cb->args[1] = idx;
1187         return skb->len;
1188 }
1189
1190 #ifdef CONFIG_PROC_FS
1191
1192 static int decnet_cache_get_info(char *buffer, char **start, off_t offset, int length)
1193 {
1194         int len = 0;
1195         off_t pos = 0;
1196         off_t begin = 0;
1197         struct dn_route *rt;
1198         int i;
1199         char buf1[DN_ASCBUF_LEN], buf2[DN_ASCBUF_LEN];
1200
1201         for(i = 0; i <= dn_rt_hash_mask; i++) {
1202                 read_lock_bh(&dn_rt_hash_table[i].lock);
1203                 rt = dn_rt_hash_table[i].chain;
1204                 for(; rt != NULL; rt = rt->u.rt_next) {
1205                         len += sprintf(buffer + len, "%-8s %-7s %-7s %04d %04d %04d\n",
1206                                         rt->u.dst.dev ? rt->u.dst.dev->name : "*",
1207                                         dn_addr2asc(dn_ntohs(rt->rt_daddr), buf1),
1208                                         dn_addr2asc(dn_ntohs(rt->rt_saddr), buf2),
1209                                         atomic_read(&rt->u.dst.__refcnt),
1210                                         rt->u.dst.__use,
1211                                         (int)rt->u.dst.rtt
1212                                         );
1213
1214
1215
1216                         pos = begin + len;
1217
1218                         if (pos < offset) {
1219                                 len   = 0;
1220                                 begin = pos;
1221                         }
1222                         if (pos > offset + length)
1223                                 break;
1224                 }
1225                 read_unlock_bh(&dn_rt_hash_table[i].lock);
1226                 if (pos > offset + length)
1227                         break;
1228         }
1229
1230         *start = buffer + (offset - begin);
1231         len   -= (offset - begin);
1232
1233         if (len > length) len = length;
1234
1235         return(len);
1236 }
1237
1238 #endif /* CONFIG_PROC_FS */
1239
1240 void __init dn_route_init(void)
1241 {
1242         int i, goal, order;
1243
1244         dn_dst_ops.kmem_cachep = kmem_cache_create("dn_dst_cache",
1245                                                    sizeof(struct dn_route),
1246                                                    0, SLAB_HWCACHE_ALIGN,
1247                                                    NULL, NULL);
1248
1249         if (!dn_dst_ops.kmem_cachep)
1250                 panic("DECnet: Failed to allocate dn_dst_cache\n");
1251
1252         dn_route_timer.function = dn_dst_check_expire;
1253         dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ;
1254         add_timer(&dn_route_timer);
1255
1256         goal = num_physpages >> (26 - PAGE_SHIFT);
1257
1258         for(order = 0; (1UL << order) < goal; order++)
1259                 /* NOTHING */;
1260
1261         /*
1262          * Only want 1024 entries max, since the table is very, very unlikely
1263          * to be larger than that.
1264          */
1265         while(order && ((((1UL << order) * PAGE_SIZE) /
1266                                 sizeof(struct dn_rt_hash_bucket)) >= 2048))
1267                 order--;
1268
1269         do {
1270                 dn_rt_hash_mask = (1UL << order) * PAGE_SIZE /
1271                         sizeof(struct dn_rt_hash_bucket);
1272                 while(dn_rt_hash_mask & (dn_rt_hash_mask - 1))
1273                         dn_rt_hash_mask--;
1274                 dn_rt_hash_table = (struct dn_rt_hash_bucket *)
1275                         __get_free_pages(GFP_ATOMIC, order);
1276         } while (dn_rt_hash_table == NULL && --order > 0);
1277
1278         if (!dn_rt_hash_table)
1279                 panic("Failed to allocate DECnet route cache hash table\n");
1280
1281         printk(KERN_INFO
1282                 "DECnet: Routing cache hash table of %u buckets, %ldKbytes\n",
1283                 dn_rt_hash_mask,
1284                 (long)(dn_rt_hash_mask*sizeof(struct dn_rt_hash_bucket))/1024);
1285
1286         dn_rt_hash_mask--;
1287         for(i = 0; i <= dn_rt_hash_mask; i++) {
1288                 dn_rt_hash_table[i].lock = RW_LOCK_UNLOCKED;
1289                 dn_rt_hash_table[i].chain = NULL;
1290         }
1291
1292         dn_dst_ops.gc_thresh = (dn_rt_hash_mask + 1);
1293
1294 #ifdef CONFIG_PROC_FS
1295         proc_net_create("decnet_cache",0,decnet_cache_get_info);
1296 #endif /* CONFIG_PROC_FS */
1297 }
1298
1299 void __exit dn_route_cleanup(void)
1300 {
1301         del_timer(&dn_route_timer);
1302         dn_run_flush(0);
1303
1304         proc_net_remove("decnet_cache");
1305 }
1306