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Linux/net/decnet/dn_neigh.c

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  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_long_error_report(struct neighbour *, struct sk_buff *);
 53 static void dn_short_error_report(struct neighbour *, struct sk_buff *);
 54 static int dn_long_output(struct neighbour *, struct sk_buff *);
 55 static int dn_short_output(struct neighbour *, struct sk_buff *);
 56 static int dn_phase3_output(struct neighbour *, struct sk_buff *);
 57 
 58 
 59 /*
 60  * For talking to broadcast devices: Ethernet & PPP
 61  */
 62 static const struct neigh_ops dn_long_ops = {
 63         .family =               AF_DECnet,
 64         .error_report =         dn_long_error_report,
 65         .output =               dn_long_output,
 66         .connected_output =     dn_long_output,
 67 };
 68 
 69 /*
 70  * For talking to pointopoint and multidrop devices: DDCMP and X.25
 71  */
 72 static const struct neigh_ops dn_short_ops = {
 73         .family =               AF_DECnet,
 74         .error_report =         dn_short_error_report,
 75         .output =               dn_short_output,
 76         .connected_output =     dn_short_output,
 77 };
 78 
 79 /*
 80  * For talking to DECnet phase III nodes
 81  */
 82 static const struct neigh_ops dn_phase3_ops = {
 83         .family =               AF_DECnet,
 84         .error_report =         dn_short_error_report, /* Can use short version here */
 85         .output =               dn_phase3_output,
 86         .connected_output =     dn_phase3_output,
 87 };
 88 
 89 static u32 dn_neigh_hash(const void *pkey,
 90                          const struct net_device *dev,
 91                          __u32 *hash_rnd)
 92 {
 93         return jhash_2words(*(__u16 *)pkey, 0, hash_rnd[0]);
 94 }
 95 
 96 struct neigh_table dn_neigh_table = {
 97         .family =                       PF_DECnet,
 98         .entry_size =                   NEIGH_ENTRY_SIZE(sizeof(struct dn_neigh)),
 99         .key_len =                      sizeof(__le16),
100         .hash =                         dn_neigh_hash,
101         .constructor =                  dn_neigh_construct,
102         .id =                           "dn_neigh_cache",
103         .parms ={
104                 .tbl =                  &dn_neigh_table,
105                 .base_reachable_time =  30 * HZ,
106                 .retrans_time = 1 * HZ,
107                 .gc_staletime = 60 * HZ,
108                 .reachable_time =               30 * HZ,
109                 .delay_probe_time =     5 * HZ,
110                 .queue_len_bytes =      64*1024,
111                 .ucast_probes = 0,
112                 .app_probes =           0,
113                 .mcast_probes = 0,
114                 .anycast_delay =        0,
115                 .proxy_delay =          0,
116                 .proxy_qlen =           0,
117                 .locktime =             1 * HZ,
118         },
119         .gc_interval =                  30 * HZ,
120         .gc_thresh1 =                   128,
121         .gc_thresh2 =                   512,
122         .gc_thresh3 =                   1024,
123 };
124 
125 static int dn_neigh_construct(struct neighbour *neigh)
126 {
127         struct net_device *dev = neigh->dev;
128         struct dn_neigh *dn = (struct dn_neigh *)neigh;
129         struct dn_dev *dn_db;
130         struct neigh_parms *parms;
131 
132         rcu_read_lock();
133         dn_db = rcu_dereference(dev->dn_ptr);
134         if (dn_db == NULL) {
135                 rcu_read_unlock();
136                 return -EINVAL;
137         }
138 
139         parms = dn_db->neigh_parms;
140         if (!parms) {
141                 rcu_read_unlock();
142                 return -EINVAL;
143         }
144 
145         __neigh_parms_put(neigh->parms);
146         neigh->parms = neigh_parms_clone(parms);
147 
148         if (dn_db->use_long)
149                 neigh->ops = &dn_long_ops;
150         else
151                 neigh->ops = &dn_short_ops;
152         rcu_read_unlock();
153 
154         if (dn->flags & DN_NDFLAG_P3)
155                 neigh->ops = &dn_phase3_ops;
156 
157         neigh->nud_state = NUD_NOARP;
158         neigh->output = neigh->ops->connected_output;
159 
160         if ((dev->type == ARPHRD_IPGRE) || (dev->flags & IFF_POINTOPOINT))
161                 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
162         else if ((dev->type == ARPHRD_ETHER) || (dev->type == ARPHRD_LOOPBACK))
163                 dn_dn2eth(neigh->ha, dn->addr);
164         else {
165                 net_dbg_ratelimited("Trying to create neigh for hw %d\n",
166                                     dev->type);
167                 return -EINVAL;
168         }
169 
170         /*
171          * Make an estimate of the remote block size by assuming that its
172          * two less then the device mtu, which it true for ethernet (and
173          * other things which support long format headers) since there is
174          * an extra length field (of 16 bits) which isn't part of the
175          * ethernet headers and which the DECnet specs won't admit is part
176          * of the DECnet routing headers either.
177          *
178          * If we over estimate here its no big deal, the NSP negotiations
179          * will prevent us from sending packets which are too large for the
180          * remote node to handle. In any case this figure is normally updated
181          * by a hello message in most cases.
182          */
183         dn->blksize = dev->mtu - 2;
184 
185         return 0;
186 }
187 
188 static void dn_long_error_report(struct neighbour *neigh, struct sk_buff *skb)
189 {
190         printk(KERN_DEBUG "dn_long_error_report: called\n");
191         kfree_skb(skb);
192 }
193 
194 
195 static void dn_short_error_report(struct neighbour *neigh, struct sk_buff *skb)
196 {
197         printk(KERN_DEBUG "dn_short_error_report: called\n");
198         kfree_skb(skb);
199 }
200 
201 static int dn_neigh_output_packet(struct sk_buff *skb)
202 {
203         struct dst_entry *dst = skb_dst(skb);
204         struct dn_route *rt = (struct dn_route *)dst;
205         struct neighbour *neigh = rt->n;
206         struct net_device *dev = neigh->dev;
207         char mac_addr[ETH_ALEN];
208         unsigned int seq;
209         int err;
210 
211         dn_dn2eth(mac_addr, rt->rt_local_src);
212         do {
213                 seq = read_seqbegin(&neigh->ha_lock);
214                 err = dev_hard_header(skb, dev, ntohs(skb->protocol),
215                                       neigh->ha, mac_addr, skb->len);
216         } while (read_seqretry(&neigh->ha_lock, seq));
217 
218         if (err >= 0)
219                 err = dev_queue_xmit(skb);
220         else {
221                 kfree_skb(skb);
222                 err = -EINVAL;
223         }
224         return err;
225 }
226 
227 static int dn_long_output(struct neighbour *neigh, struct sk_buff *skb)
228 {
229         struct net_device *dev = neigh->dev;
230         int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3;
231         unsigned char *data;
232         struct dn_long_packet *lp;
233         struct dn_skb_cb *cb = DN_SKB_CB(skb);
234 
235 
236         if (skb_headroom(skb) < headroom) {
237                 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
238                 if (skb2 == NULL) {
239                         net_crit_ratelimited("dn_long_output: no memory\n");
240                         kfree_skb(skb);
241                         return -ENOBUFS;
242                 }
243                 consume_skb(skb);
244                 skb = skb2;
245                 net_info_ratelimited("dn_long_output: Increasing headroom\n");
246         }
247 
248         data = skb_push(skb, sizeof(struct dn_long_packet) + 3);
249         lp = (struct dn_long_packet *)(data+3);
250 
251         *((__le16 *)data) = cpu_to_le16(skb->len - 2);
252         *(data + 2) = 1 | DN_RT_F_PF; /* Padding */
253 
254         lp->msgflg   = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS));
255         lp->d_area   = lp->d_subarea = 0;
256         dn_dn2eth(lp->d_id, cb->dst);
257         lp->s_area   = lp->s_subarea = 0;
258         dn_dn2eth(lp->s_id, cb->src);
259         lp->nl2      = 0;
260         lp->visit_ct = cb->hops & 0x3f;
261         lp->s_class  = 0;
262         lp->pt       = 0;
263 
264         skb_reset_network_header(skb);
265 
266         return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, skb, NULL,
267                        neigh->dev, dn_neigh_output_packet);
268 }
269 
270 static int dn_short_output(struct neighbour *neigh, struct sk_buff *skb)
271 {
272         struct net_device *dev = neigh->dev;
273         int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
274         struct dn_short_packet *sp;
275         unsigned char *data;
276         struct dn_skb_cb *cb = DN_SKB_CB(skb);
277 
278 
279         if (skb_headroom(skb) < headroom) {
280                 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
281                 if (skb2 == NULL) {
282                         net_crit_ratelimited("dn_short_output: no memory\n");
283                         kfree_skb(skb);
284                         return -ENOBUFS;
285                 }
286                 consume_skb(skb);
287                 skb = skb2;
288                 net_info_ratelimited("dn_short_output: Increasing headroom\n");
289         }
290 
291         data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
292         *((__le16 *)data) = cpu_to_le16(skb->len - 2);
293         sp = (struct dn_short_packet *)(data+2);
294 
295         sp->msgflg     = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
296         sp->dstnode    = cb->dst;
297         sp->srcnode    = cb->src;
298         sp->forward    = cb->hops & 0x3f;
299 
300         skb_reset_network_header(skb);
301 
302         return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, skb, NULL,
303                        neigh->dev, dn_neigh_output_packet);
304 }
305 
306 /*
307  * Phase 3 output is the same is short output, execpt that
308  * it clears the area bits before transmission.
309  */
310 static int dn_phase3_output(struct neighbour *neigh, struct sk_buff *skb)
311 {
312         struct net_device *dev = neigh->dev;
313         int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
314         struct dn_short_packet *sp;
315         unsigned char *data;
316         struct dn_skb_cb *cb = DN_SKB_CB(skb);
317 
318         if (skb_headroom(skb) < headroom) {
319                 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
320                 if (skb2 == NULL) {
321                         net_crit_ratelimited("dn_phase3_output: no memory\n");
322                         kfree_skb(skb);
323                         return -ENOBUFS;
324                 }
325                 consume_skb(skb);
326                 skb = skb2;
327                 net_info_ratelimited("dn_phase3_output: Increasing headroom\n");
328         }
329 
330         data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
331         *((__le16 *)data) = cpu_to_le16(skb->len - 2);
332         sp = (struct dn_short_packet *)(data + 2);
333 
334         sp->msgflg   = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
335         sp->dstnode  = cb->dst & cpu_to_le16(0x03ff);
336         sp->srcnode  = cb->src & cpu_to_le16(0x03ff);
337         sp->forward  = cb->hops & 0x3f;
338 
339         skb_reset_network_header(skb);
340 
341         return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, skb, NULL,
342                        neigh->dev, dn_neigh_output_packet);
343 }
344 
345 /*
346  * Unfortunately, the neighbour code uses the device in its hash
347  * function, so we don't get any advantage from it. This function
348  * basically does a neigh_lookup(), but without comparing the device
349  * field. This is required for the On-Ethernet cache
350  */
351 
352 /*
353  * Pointopoint link receives a hello message
354  */
355 void dn_neigh_pointopoint_hello(struct sk_buff *skb)
356 {
357         kfree_skb(skb);
358 }
359 
360 /*
361  * Ethernet router hello message received
362  */
363 int dn_neigh_router_hello(struct sk_buff *skb)
364 {
365         struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data;
366 
367         struct neighbour *neigh;
368         struct dn_neigh *dn;
369         struct dn_dev *dn_db;
370         __le16 src;
371 
372         src = dn_eth2dn(msg->id);
373 
374         neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
375 
376         dn = (struct dn_neigh *)neigh;
377 
378         if (neigh) {
379                 write_lock(&neigh->lock);
380 
381                 neigh->used = jiffies;
382                 dn_db = rcu_dereference(neigh->dev->dn_ptr);
383 
384                 if (!(neigh->nud_state & NUD_PERMANENT)) {
385                         neigh->updated = jiffies;
386 
387                         if (neigh->dev->type == ARPHRD_ETHER)
388                                 memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
389 
390                         dn->blksize  = le16_to_cpu(msg->blksize);
391                         dn->priority = msg->priority;
392 
393                         dn->flags &= ~DN_NDFLAG_P3;
394 
395                         switch (msg->iinfo & DN_RT_INFO_TYPE) {
396                         case DN_RT_INFO_L1RT:
397                                 dn->flags &=~DN_NDFLAG_R2;
398                                 dn->flags |= DN_NDFLAG_R1;
399                                 break;
400                         case DN_RT_INFO_L2RT:
401                                 dn->flags |= DN_NDFLAG_R2;
402                         }
403                 }
404 
405                 /* Only use routers in our area */
406                 if ((le16_to_cpu(src)>>10) == (le16_to_cpu((decnet_address))>>10)) {
407                         if (!dn_db->router) {
408                                 dn_db->router = neigh_clone(neigh);
409                         } else {
410                                 if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
411                                         neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
412                         }
413                 }
414                 write_unlock(&neigh->lock);
415                 neigh_release(neigh);
416         }
417 
418         kfree_skb(skb);
419         return 0;
420 }
421 
422 /*
423  * Endnode hello message received
424  */
425 int dn_neigh_endnode_hello(struct sk_buff *skb)
426 {
427         struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data;
428         struct neighbour *neigh;
429         struct dn_neigh *dn;
430         __le16 src;
431 
432         src = dn_eth2dn(msg->id);
433 
434         neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
435 
436         dn = (struct dn_neigh *)neigh;
437 
438         if (neigh) {
439                 write_lock(&neigh->lock);
440 
441                 neigh->used = jiffies;
442 
443                 if (!(neigh->nud_state & NUD_PERMANENT)) {
444                         neigh->updated = jiffies;
445 
446                         if (neigh->dev->type == ARPHRD_ETHER)
447                                 memcpy(neigh->ha, &eth_hdr(skb)->h_source, ETH_ALEN);
448                         dn->flags   &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2);
449                         dn->blksize  = le16_to_cpu(msg->blksize);
450                         dn->priority = 0;
451                 }
452 
453                 write_unlock(&neigh->lock);
454                 neigh_release(neigh);
455         }
456 
457         kfree_skb(skb);
458         return 0;
459 }
460 
461 static char *dn_find_slot(char *base, int max, int priority)
462 {
463         int i;
464         unsigned char *min = NULL;
465 
466         base += 6; /* skip first id */
467 
468         for(i = 0; i < max; i++) {
469                 if (!min || (*base < *min))
470                         min = base;
471                 base += 7; /* find next priority */
472         }
473 
474         if (!min)
475                 return NULL;
476 
477         return (*min < priority) ? (min - 6) : NULL;
478 }
479 
480 struct elist_cb_state {
481         struct net_device *dev;
482         unsigned char *ptr;
483         unsigned char *rs;
484         int t, n;
485 };
486 
487 static void neigh_elist_cb(struct neighbour *neigh, void *_info)
488 {
489         struct elist_cb_state *s = _info;
490         struct dn_neigh *dn;
491 
492         if (neigh->dev != s->dev)
493                 return;
494 
495         dn = (struct dn_neigh *) neigh;
496         if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2)))
497                 return;
498 
499         if (s->t == s->n)
500                 s->rs = dn_find_slot(s->ptr, s->n, dn->priority);
501         else
502                 s->t++;
503         if (s->rs == NULL)
504                 return;
505 
506         dn_dn2eth(s->rs, dn->addr);
507         s->rs += 6;
508         *(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0;
509         *(s->rs) |= dn->priority;
510         s->rs++;
511 }
512 
513 int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n)
514 {
515         struct elist_cb_state state;
516 
517         state.dev = dev;
518         state.t = 0;
519         state.n = n;
520         state.ptr = ptr;
521         state.rs = ptr;
522 
523         neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state);
524 
525         return state.t;
526 }
527 
528 
529 #ifdef CONFIG_PROC_FS
530 
531 static inline void dn_neigh_format_entry(struct seq_file *seq,
532                                          struct neighbour *n)
533 {
534         struct dn_neigh *dn = (struct dn_neigh *) n;
535         char buf[DN_ASCBUF_LEN];
536 
537         read_lock(&n->lock);
538         seq_printf(seq, "%-7s %s%s%s   %02x    %02d  %07ld %-8s\n",
539                    dn_addr2asc(le16_to_cpu(dn->addr), buf),
540                    (dn->flags&DN_NDFLAG_R1) ? "1" : "-",
541                    (dn->flags&DN_NDFLAG_R2) ? "2" : "-",
542                    (dn->flags&DN_NDFLAG_P3) ? "3" : "-",
543                    dn->n.nud_state,
544                    atomic_read(&dn->n.refcnt),
545                    dn->blksize,
546                    (dn->n.dev) ? dn->n.dev->name : "?");
547         read_unlock(&n->lock);
548 }
549 
550 static int dn_neigh_seq_show(struct seq_file *seq, void *v)
551 {
552         if (v == SEQ_START_TOKEN) {
553                 seq_puts(seq, "Addr    Flags State Use Blksize Dev\n");
554         } else {
555                 dn_neigh_format_entry(seq, v);
556         }
557 
558         return 0;
559 }
560 
561 static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos)
562 {
563         return neigh_seq_start(seq, pos, &dn_neigh_table,
564                                NEIGH_SEQ_NEIGH_ONLY);
565 }
566 
567 static const struct seq_operations dn_neigh_seq_ops = {
568         .start = dn_neigh_seq_start,
569         .next  = neigh_seq_next,
570         .stop  = neigh_seq_stop,
571         .show  = dn_neigh_seq_show,
572 };
573 
574 static int dn_neigh_seq_open(struct inode *inode, struct file *file)
575 {
576         return seq_open_net(inode, file, &dn_neigh_seq_ops,
577                             sizeof(struct neigh_seq_state));
578 }
579 
580 static const struct file_operations dn_neigh_seq_fops = {
581         .owner          = THIS_MODULE,
582         .open           = dn_neigh_seq_open,
583         .read           = seq_read,
584         .llseek         = seq_lseek,
585         .release        = seq_release_net,
586 };
587 
588 #endif
589 
590 void __init dn_neigh_init(void)
591 {
592         neigh_table_init(&dn_neigh_table);
593         proc_create("decnet_neigh", S_IRUGO, init_net.proc_net,
594                     &dn_neigh_seq_fops);
595 }
596 
597 void __exit dn_neigh_cleanup(void)
598 {
599         remove_proc_entry("decnet_neigh", init_net.proc_net);
600         neigh_table_clear(&dn_neigh_table);
601 }
602 

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