net/decnet/dn_neigh.c

   1 /*
   2  * DECnet       An implementation of the DECnet protocol suite for the LINUX
   3  *              operating system.  DECnet is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              DECnet Neighbour Functions (Adjacency Database and
   7  *                                                        On-Ethernet Cache)
   8  *
   9  * Author:      Steve Whitehouse <SteveW@ACM.org>
  10  *
  11  *
  12  * Changes:
  13  *     Steve Whitehouse     : Fixed router listing routine
  14  *     Steve Whitehouse     : Added error_report functions
  15  *     Steve Whitehouse     : Added default router detection
  16  *     Steve Whitehouse     : Hop counts in outgoing messages
  17  *     Steve Whitehouse     : Fixed src/dst in outgoing messages so
  18  *                            forwarding now stands a good chance of
  19  *                            working.
  20  *     Steve Whitehouse     : Fixed neighbour states (for now anyway).
  21  *     Steve Whitehouse     : Made error_report functions dummies. This
  22  *                            is not the right place to return skbs.
  23  *     Steve Whitehouse     : Convert to seq_file
  24  *
  25  */
  26
  27 #include <linux/net.h>
  28 #include <linux/module.h>
  29 #include <linux/socket.h>
  30 #include <linux/if_arp.h>
  31 #include <linux/slab.h>
  32 #include <linux/if_ether.h>
  33 #include <linux/init.h>
  34 #include <linux/proc_fs.h>
  35 #include <linux/string.h>
  36 #include <linux/netfilter_decnet.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/rcupdate.h>
  40 #include <linux/jhash.h>
  41 #include <linux/atomic.h>
  42 #include <net/net_namespace.h>
  43 #include <net/neighbour.h>
  44 #include <net/dst.h>
  45 #include <net/flow.h>
  46 #include <net/dn.h>
  47 #include <net/dn_dev.h>
  48 #include <net/dn_neigh.h>
  49 #include <net/dn_route.h>
  50
  51 static int dn_neigh_construct(struct neighbour *);
  52 static void dn_neigh_error_report(struct neighbour *, struct sk_buff *);
  53 static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb);
  54
  55 /*
  56  * Operations for adding the link layer header.
  57  */
  58 static const struct neigh_ops dn_neigh_ops = {
  59         .family =               AF_DECnet,
  60         .error_report =         dn_neigh_error_report,
  61         .output =               dn_neigh_output,
  62         .connected_output =     dn_neigh_output,
  63 };
  64
  65 static u32 dn_neigh_hash(const void *pkey,
  66                          const struct net_device *dev,
  67                          __u32 *hash_rnd)
  68 {
  69         return jhash_2words(*(__u16 *)pkey, 0, hash_rnd[0]);
  70 }
  71
  72 static bool dn_key_eq(const struct neighbour *neigh, const void *pkey)
  73 {
  74         return neigh_key_eq16(neigh, pkey);
  75 }
  76
  77 struct neigh_table dn_neigh_table = {
  78         .family =                       PF_DECnet,
  79         .entry_size =                   NEIGH_ENTRY_SIZE(sizeof(struct dn_neigh)),
  80         .key_len =                      sizeof(__le16),
  81         .protocol =                     cpu_to_be16(ETH_P_DNA_RT),
  82         .hash =                         dn_neigh_hash,
  83         .key_eq =                       dn_key_eq,
  84         .constructor =                  dn_neigh_construct,
  85         .id =                           "dn_neigh_cache",
  86         .parms ={
  87                 .tbl =                  &dn_neigh_table,
  88                 .reachable_time =       30 * HZ,
  89                 .data = {
  90                         [NEIGH_VAR_MCAST_PROBES] = 0,
  91                         [NEIGH_VAR_UCAST_PROBES] = 0,
  92                         [NEIGH_VAR_APP_PROBES] = 0,
  93                         [NEIGH_VAR_RETRANS_TIME] = 1 * HZ,
  94                         [NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ,
  95                         [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
  96                         [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
  97                         [NEIGH_VAR_QUEUE_LEN_BYTES] = 64*1024,
  98                         [NEIGH_VAR_PROXY_QLEN] = 0,
  99                         [NEIGH_VAR_ANYCAST_DELAY] = 0,
 100                         [NEIGH_VAR_PROXY_DELAY] = 0,
 101                         [NEIGH_VAR_LOCKTIME] = 1 * HZ,
 102                 },
 103         },
 104         .gc_interval =                  30 * HZ,
 105         .gc_thresh1 =                   128,
 106         .gc_thresh2 =                   512,
 107         .gc_thresh3 =                   1024,
 108 };
 109
 110 static int dn_neigh_construct(struct neighbour *neigh)
 111 {
 112         struct net_device *dev = neigh->dev;
 113         struct dn_neigh *dn = (struct dn_neigh *)neigh;
 114         struct dn_dev *dn_db;
 115         struct neigh_parms *parms;
 116
 117         rcu_read_lock();
 118         dn_db = rcu_dereference(dev->dn_ptr);
 119         if (dn_db == NULL) {
 120                 rcu_read_unlock();
 121                 return -EINVAL;
 122         }
 123
 124         parms = dn_db->neigh_parms;
 125         if (!parms) {
 126                 rcu_read_unlock();
 127                 return -EINVAL;
 128         }
 129
 130         __neigh_parms_put(neigh->parms);
 131         neigh->parms = neigh_parms_clone(parms);
 132         rcu_read_unlock();
 133
 134         neigh->ops = &dn_neigh_ops;
 135         neigh->nud_state = NUD_NOARP;
 136         neigh->output = neigh->ops->connected_output;
 137
 138         if ((dev->type == ARPHRD_IPGRE) || (dev->flags & IFF_POINTOPOINT))
 139                 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
 140         else if ((dev->type == ARPHRD_ETHER) || (dev->type == ARPHRD_LOOPBACK))
 141                 dn_dn2eth(neigh->ha, dn->addr);
 142         else {
 143                 net_dbg_ratelimited("Trying to create neigh for hw %d\n",
 144                                     dev->type);
 145                 return -EINVAL;
 146         }
 147
 148         /*
 149          * Make an estimate of the remote block size by assuming that its
 150          * two less then the device mtu, which it true for ethernet (and
 151          * other things which support long format headers) since there is
 152          * an extra length field (of 16 bits) which isn't part of the
 153          * ethernet headers and which the DECnet specs won't admit is part
 154          * of the DECnet routing headers either.
 155          *
 156          * If we over estimate here its no big deal, the NSP negotiations
 157          * will prevent us from sending packets which are too large for the
 158          * remote node to handle. In any case this figure is normally updated
 159          * by a hello message in most cases.
 160          */
 161         dn->blksize = dev->mtu - 2;
 162
 163         return 0;
 164 }
 165
 166 static void dn_neigh_error_report(struct neighbour *neigh, struct sk_buff *skb)
 167 {
 168         printk(KERN_DEBUG "dn_neigh_error_report: called\n");
 169         kfree_skb(skb);
 170 }
 171
 172 static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb)
 173 {
 174         struct dst_entry *dst = skb_dst(skb);
 175         struct dn_route *rt = (struct dn_route *)dst;
 176         struct net_device *dev = neigh->dev;
 177         char mac_addr[ETH_ALEN];
 178         unsigned int seq;
 179         int err;
 180
 181         dn_dn2eth(mac_addr, rt->rt_local_src);
 182         do {
 183                 seq = read_seqbegin(&neigh->ha_lock);
 184                 err = dev_hard_header(skb, dev, ntohs(skb->protocol),
 185                                       neigh->ha, mac_addr, skb->len);
 186         } while (read_seqretry(&neigh->ha_lock, seq));
 187
 188         if (err >= 0)
 189                 err = dev_queue_xmit(skb);
 190         else {
 191                 kfree_skb(skb);
 192                 err = -EINVAL;
 193         }
 194         return err;
 195 }
 196
 197 static int dn_neigh_output_packet(struct sock *sk, struct sk_buff *skb)
 198 {
 199         struct dst_entry *dst = skb_dst(skb);
 200         struct dn_route *rt = (struct dn_route *)dst;
 201         struct neighbour *neigh = rt->n;
 202
 203         return neigh->output(neigh, skb);
 204 }
 205
 206 /*
 207  * For talking to broadcast devices: Ethernet & PPP
 208  */
 209 static int dn_long_output(struct neighbour *neigh, struct sock *sk,
 210                           struct sk_buff *skb)
 211 {
 212         struct net_device *dev = neigh->dev;
 213         int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3;
 214         unsigned char *data;
 215         struct dn_long_packet *lp;
 216         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 217
 218
 219         if (skb_headroom(skb) < headroom) {
 220                 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
 221                 if (skb2 == NULL) {
 222                         net_crit_ratelimited("dn_long_output: no memory\n");
 223                         kfree_skb(skb);
 224                         return -ENOBUFS;
 225                 }
 226                 consume_skb(skb);
 227                 skb = skb2;
 228                 net_info_ratelimited("dn_long_output: Increasing headroom\n");
 229         }
 230
 231         data = skb_push(skb, sizeof(struct dn_long_packet) + 3);
 232         lp = (struct dn_long_packet *)(data+3);
 233
 234         *((__le16 *)data) = cpu_to_le16(skb->len - 2);
 235         *(data + 2) = 1 | DN_RT_F_PF; /* Padding */
 236
 237         lp->msgflg   = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS));
 238         lp->d_area   = lp->d_subarea = 0;
 239         dn_dn2eth(lp->d_id, cb->dst);
 240         lp->s_area   = lp->s_subarea = 0;
 241         dn_dn2eth(lp->s_id, cb->src);
 242         lp->nl2      = 0;
 243         lp->visit_ct = cb->hops & 0x3f;
 244         lp->s_class  = 0;
 245         lp->pt       = 0;
 246
 247         skb_reset_network_header(skb);
 248
 249         return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, sk, skb,
 250                        NULL, neigh->dev, dn_neigh_output_packet);
 251 }
 252
 253 /*
 254  * For talking to pointopoint and multidrop devices: DDCMP and X.25
 255  */
 256 static int dn_short_output(struct neighbour *neigh, struct sock *sk,
 257                            struct sk_buff *skb)
 258 {
 259         struct net_device *dev = neigh->dev;
 260         int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
 261         struct dn_short_packet *sp;
 262         unsigned char *data;
 263         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 264
 265
 266         if (skb_headroom(skb) < headroom) {
 267                 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
 268                 if (skb2 == NULL) {
 269                         net_crit_ratelimited("dn_short_output: no memory\n");
 270                         kfree_skb(skb);
 271                         return -ENOBUFS;
 272                 }
 273                 consume_skb(skb);
 274                 skb = skb2;
 275                 net_info_ratelimited("dn_short_output: Increasing headroom\n");
 276         }
 277
 278         data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
 279         *((__le16 *)data) = cpu_to_le16(skb->len - 2);
 280         sp = (struct dn_short_packet *)(data+2);
 281
 282         sp->msgflg     = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
 283         sp->dstnode    = cb->dst;
 284         sp->srcnode    = cb->src;
 285         sp->forward    = cb->hops & 0x3f;
 286
 287         skb_reset_network_header(skb);
 288
 289         return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, sk, skb,
 290                        NULL, neigh->dev, dn_neigh_output_packet);
 291 }
 292
 293 /*
 294  * For talking to DECnet phase III nodes
 295  * Phase 3 output is the same as short output, execpt that
 296  * it clears the area bits before transmission.
 297  */
 298 static int dn_phase3_output(struct neighbour *neigh, struct sock *sk,
 299                             struct sk_buff *skb)
 300 {
 301         struct net_device *dev = neigh->dev;
 302         int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
 303         struct dn_short_packet *sp;
 304         unsigned char *data;
 305         struct dn_skb_cb *cb = DN_SKB_CB(skb);
 306
 307         if (skb_headroom(skb) < headroom) {
 308                 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
 309                 if (skb2 == NULL) {
 310                         net_crit_ratelimited("dn_phase3_output: no memory\n");
 311                         kfree_skb(skb);
 312                         return -ENOBUFS;
 313                 }
 314                 consume_skb(skb);
 315                 skb = skb2;
 316                 net_info_ratelimited("dn_phase3_output: Increasing headroom\n");
 317         }
 318
 319         data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
 320         *((__le16 *)data) = cpu_to_le16(skb->len - 2);
 321         sp = (struct dn_short_packet *)(data + 2);
 322
 323         sp->msgflg   = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
 324         sp->dstnode  = cb->dst & cpu_to_le16(0x03ff);
 325         sp->srcnode  = cb->src & cpu_to_le16(0x03ff);
 326         sp->forward  = cb->hops & 0x3f;
 327
 328         skb_reset_network_header(skb);
 329
 330         return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, sk, skb,
 331                        NULL, neigh->dev, dn_neigh_output_packet);
 332 }
 333
 334 int dn_to_neigh_output(struct sock *sk, struct sk_buff *skb)
 335 {
 336         struct dst_entry *dst = skb_dst(skb);
 337         struct dn_route *rt = (struct dn_route *) dst;
 338         struct neighbour *neigh = rt->n;
 339         struct dn_neigh *dn = (struct dn_neigh *)neigh;
 340         struct dn_dev *dn_db;
 341         bool use_long;
 342
 343         rcu_read_lock();
 344         dn_db = rcu_dereference(neigh->dev->dn_ptr);
 345         if (dn_db == NULL) {
 346                 rcu_read_unlock();
 347                 return -EINVAL;
 348         }
 349         use_long = dn_db->use_long;
 350         rcu_read_unlock();
 351
 352         if (dn->flags & DN_NDFLAG_P3)
 353                 return dn_phase3_output(neigh, sk, skb);
 354         if (use_long)
 355                 return dn_long_output(neigh, sk, skb);
 356         else
 357                 return dn_short_output(neigh, sk, skb);
 358 }
 359
 360 /*
 361  * Unfortunately, the neighbour code uses the device in its hash
 362  * function, so we don't get any advantage from it. This function
 363  * basically does a neigh_lookup(), but without comparing the device
 364  * field. This is required for the On-Ethernet cache
 365  */
 366
 367 /*
 368  * Pointopoint link receives a hello message
 369  */
 370 void dn_neigh_pointopoint_hello(struct sk_buff *skb)
 371 {
 372         kfree_skb(skb);
 373 }
 374
 375 /*
 376  * Ethernet router hello message received
 377  */
 378 int dn_neigh_router_hello(struct sock *sk, struct sk_buff *skb)
 379 {
 380         struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data;
 381
 382         struct neighbour *neigh;
 383         struct dn_neigh *dn;
 384         struct dn_dev *dn_db;
 385         __le16 src;
 386
 387         src = dn_eth2dn(msg->id);
 388
 389         neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
 390
 391         dn = (struct dn_neigh *)neigh;
 392
 393         if (neigh) {
 394                 write_lock(&neigh->lock);
 395
 396                 neigh->used = jiffies;
 397                 dn_db = rcu_dereference(neigh->dev->dn_ptr);
 398
 399                 if (!(neigh->nud_state & NUD_PERMANENT)) {
 400                         neigh->updated = jiffies;
 401
 402                         if (neigh->dev->type == ARPHRD_ETHER)
 403                                 memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
 404
 405                         dn->blksize  = le16_to_cpu(msg->blksize);
 406                         dn->priority = msg->priority;
 407
 408                         dn->flags &= ~DN_NDFLAG_P3;
 409
 410                         switch (msg->iinfo & DN_RT_INFO_TYPE) {
 411                         case DN_RT_INFO_L1RT:
 412                                 dn->flags &=~DN_NDFLAG_R2;
 413                                 dn->flags |= DN_NDFLAG_R1;
 414                                 break;
 415                         case DN_RT_INFO_L2RT:
 416                                 dn->flags |= DN_NDFLAG_R2;
 417                         }
 418                 }
 419
 420                 /* Only use routers in our area */
 421                 if ((le16_to_cpu(src)>>10) == (le16_to_cpu((decnet_address))>>10)) {
 422                         if (!dn_db->router) {
 423                                 dn_db->router = neigh_clone(neigh);
 424                         } else {
 425                                 if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
 426                                         neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
 427                         }
 428                 }
 429                 write_unlock(&neigh->lock);
 430                 neigh_release(neigh);
 431         }
 432
 433         kfree_skb(skb);
 434         return 0;
 435 }
 436
 437 /*
 438  * Endnode hello message received
 439  */
 440 int dn_neigh_endnode_hello(struct sock *sk, struct sk_buff *skb)
 441 {
 442         struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data;
 443         struct neighbour *neigh;
 444         struct dn_neigh *dn;
 445         __le16 src;
 446
 447         src = dn_eth2dn(msg->id);
 448
 449         neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
 450
 451         dn = (struct dn_neigh *)neigh;
 452
 453         if (neigh) {
 454                 write_lock(&neigh->lock);
 455
 456                 neigh->used = jiffies;
 457
 458                 if (!(neigh->nud_state & NUD_PERMANENT)) {
 459                         neigh->updated = jiffies;
 460
 461                         if (neigh->dev->type == ARPHRD_ETHER)
 462                                 memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
 463                         dn->flags   &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2);
 464                         dn->blksize  = le16_to_cpu(msg->blksize);
 465                         dn->priority = 0;
 466                 }
 467
 468                 write_unlock(&neigh->lock);
 469                 neigh_release(neigh);
 470         }
 471
 472         kfree_skb(skb);
 473         return 0;
 474 }
 475
 476 static char *dn_find_slot(char *base, int max, int priority)
 477 {
 478         int i;
 479         unsigned char *min = NULL;
 480
 481         base += 6; /* skip first id */
 482
 483         for(i = 0; i < max; i++) {
 484                 if (!min || (*base < *min))
 485                         min = base;
 486                 base += 7; /* find next priority */
 487         }
 488
 489         if (!min)
 490                 return NULL;
 491
 492         return (*min < priority) ? (min - 6) : NULL;
 493 }
 494
 495 struct elist_cb_state {
 496         struct net_device *dev;
 497         unsigned char *ptr;
 498         unsigned char *rs;
 499         int t, n;
 500 };
 501
 502 static void neigh_elist_cb(struct neighbour *neigh, void *_info)
 503 {
 504         struct elist_cb_state *s = _info;
 505         struct dn_neigh *dn;
 506
 507         if (neigh->dev != s->dev)
 508                 return;
 509
 510         dn = (struct dn_neigh *) neigh;
 511         if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2)))
 512                 return;
 513
 514         if (s->t == s->n)
 515                 s->rs = dn_find_slot(s->ptr, s->n, dn->priority);
 516         else
 517                 s->t++;
 518         if (s->rs == NULL)
 519                 return;
 520
 521         dn_dn2eth(s->rs, dn->addr);
 522         s->rs += 6;
 523         *(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0;
 524         *(s->rs) |= dn->priority;
 525         s->rs++;
 526 }
 527
 528 int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n)
 529 {
 530         struct elist_cb_state state;
 531
 532         state.dev = dev;
 533         state.t = 0;
 534         state.n = n;
 535         state.ptr = ptr;
 536         state.rs = ptr;
 537
 538         neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state);
 539
 540         return state.t;
 541 }
 542
 543
 544 #ifdef CONFIG_PROC_FS
 545
 546 static inline void dn_neigh_format_entry(struct seq_file *seq,
 547                                          struct neighbour *n)
 548 {
 549         struct dn_neigh *dn = (struct dn_neigh *) n;
 550         char buf[DN_ASCBUF_LEN];
 551
 552         read_lock(&n->lock);
 553         seq_printf(seq, "%-7s %s%s%s   %02x    %02d  %07ld %-8s\n",
 554                    dn_addr2asc(le16_to_cpu(dn->addr), buf),
 555                    (dn->flags&DN_NDFLAG_R1) ? "1" : "-",
 556                    (dn->flags&DN_NDFLAG_R2) ? "2" : "-",
 557                    (dn->flags&DN_NDFLAG_P3) ? "3" : "-",
 558                    dn->n.nud_state,
 559                    atomic_read(&dn->n.refcnt),
 560                    dn->blksize,
 561                    (dn->n.dev) ? dn->n.dev->name : "?");
 562         read_unlock(&n->lock);
 563 }
 564
 565 static int dn_neigh_seq_show(struct seq_file *seq, void *v)
 566 {
 567         if (v == SEQ_START_TOKEN) {
 568                 seq_puts(seq, "Addr    Flags State Use Blksize Dev\n");
 569         } else {
 570                 dn_neigh_format_entry(seq, v);
 571         }
 572
 573         return 0;
 574 }
 575
 576 static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos)
 577 {
 578         return neigh_seq_start(seq, pos, &dn_neigh_table,
 579                                NEIGH_SEQ_NEIGH_ONLY);
 580 }
 581
 582 static const struct seq_operations dn_neigh_seq_ops = {
 583         .start = dn_neigh_seq_start,
 584         .next  = neigh_seq_next,
 585         .stop  = neigh_seq_stop,
 586         .show  = dn_neigh_seq_show,
 587 };
 588
 589 static int dn_neigh_seq_open(struct inode *inode, struct file *file)
 590 {
 591         return seq_open_net(inode, file, &dn_neigh_seq_ops,
 592                             sizeof(struct neigh_seq_state));
 593 }
 594
 595 static const struct file_operations dn_neigh_seq_fops = {
 596         .owner          = THIS_MODULE,
 597         .open           = dn_neigh_seq_open,
 598         .read           = seq_read,
 599         .llseek         = seq_lseek,
 600         .release        = seq_release_net,
 601 };
 602
 603 #endif
 604
 605 void __init dn_neigh_init(void)
 606 {
 607         neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table);
 608         proc_create("decnet_neigh", S_IRUGO, init_net.proc_net,
 609                     &dn_neigh_seq_fops);
 610 }
 611
 612 void __exit dn_neigh_cleanup(void)
 613 {
 614         remove_proc_entry("decnet_neigh", init_net.proc_net);
 615         neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table);
 616 }