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1// SPDX-License-Identifier: GPL-2.0
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 Neighbour Functions (Adjacency Database and
8 * On-Ethernet Cache)
9 *
10 * Author: Steve Whitehouse <SteveW@ACM.org>
11 *
12 *
13 * Changes:
14 * Steve Whitehouse : Fixed router listing routine
15 * Steve Whitehouse : Added error_report functions
16 * Steve Whitehouse : Added default router detection
17 * Steve Whitehouse : Hop counts in outgoing messages
18 * Steve Whitehouse : Fixed src/dst in outgoing messages so
19 * forwarding now stands a good chance of
20 * working.
21 * Steve Whitehouse : Fixed neighbour states (for now anyway).
22 * Steve Whitehouse : Made error_report functions dummies. This
23 * is not the right place to return skbs.
24 * Steve Whitehouse : Convert to seq_file
25 *
26 */
27
28#include <linux/net.h>
29#include <linux/module.h>
30#include <linux/socket.h>
31#include <linux/if_arp.h>
32#include <linux/slab.h>
33#include <linux/if_ether.h>
34#include <linux/init.h>
35#include <linux/proc_fs.h>
36#include <linux/string.h>
37#include <linux/netfilter_decnet.h>
38#include <linux/spinlock.h>
39#include <linux/seq_file.h>
40#include <linux/rcupdate.h>
41#include <linux/jhash.h>
42#include <linux/atomic.h>
43#include <net/net_namespace.h>
44#include <net/neighbour.h>
45#include <net/dst.h>
46#include <net/flow.h>
47#include <net/dn.h>
48#include <net/dn_dev.h>
49#include <net/dn_neigh.h>
50#include <net/dn_route.h>
51
52static int dn_neigh_construct(struct neighbour *);
53static void dn_neigh_error_report(struct neighbour *, struct sk_buff *);
54static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb);
55
56/*
57 * Operations for adding the link layer header.
58 */
59static const struct neigh_ops dn_neigh_ops = {
60 .family = AF_DECnet,
61 .error_report = dn_neigh_error_report,
62 .output = dn_neigh_output,
63 .connected_output = dn_neigh_output,
64};
65
66static u32 dn_neigh_hash(const void *pkey,
67 const struct net_device *dev,
68 __u32 *hash_rnd)
69{
70 return jhash_2words(*(__u16 *)pkey, 0, hash_rnd[0]);
71}
72
73static bool dn_key_eq(const struct neighbour *neigh, const void *pkey)
74{
75 return neigh_key_eq16(neigh, pkey);
76}
77
78struct neigh_table dn_neigh_table = {
79 .family = PF_DECnet,
80 .entry_size = NEIGH_ENTRY_SIZE(sizeof(struct dn_neigh)),
81 .key_len = sizeof(__le16),
82 .protocol = cpu_to_be16(ETH_P_DNA_RT),
83 .hash = dn_neigh_hash,
84 .key_eq = dn_key_eq,
85 .constructor = dn_neigh_construct,
86 .id = "dn_neigh_cache",
87 .parms ={
88 .tbl = &dn_neigh_table,
89 .reachable_time = 30 * HZ,
90 .data = {
91 [NEIGH_VAR_MCAST_PROBES] = 0,
92 [NEIGH_VAR_UCAST_PROBES] = 0,
93 [NEIGH_VAR_APP_PROBES] = 0,
94 [NEIGH_VAR_RETRANS_TIME] = 1 * HZ,
95 [NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ,
96 [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ,
97 [NEIGH_VAR_GC_STALETIME] = 60 * HZ,
98 [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX,
99 [NEIGH_VAR_PROXY_QLEN] = 0,
100 [NEIGH_VAR_ANYCAST_DELAY] = 0,
101 [NEIGH_VAR_PROXY_DELAY] = 0,
102 [NEIGH_VAR_LOCKTIME] = 1 * HZ,
103 },
104 },
105 .gc_interval = 30 * HZ,
106 .gc_thresh1 = 128,
107 .gc_thresh2 = 512,
108 .gc_thresh3 = 1024,
109};
110
111static int dn_neigh_construct(struct neighbour *neigh)
112{
113 struct net_device *dev = neigh->dev;
114 struct dn_neigh *dn = container_of(neigh, struct dn_neigh, n);
115 struct dn_dev *dn_db;
116 struct neigh_parms *parms;
117
118 rcu_read_lock();
119 dn_db = rcu_dereference(dev->dn_ptr);
120 if (dn_db == NULL) {
121 rcu_read_unlock();
122 return -EINVAL;
123 }
124
125 parms = dn_db->neigh_parms;
126 if (!parms) {
127 rcu_read_unlock();
128 return -EINVAL;
129 }
130
131 __neigh_parms_put(neigh->parms);
132 neigh->parms = neigh_parms_clone(parms);
133 rcu_read_unlock();
134
135 neigh->ops = &dn_neigh_ops;
136 neigh->nud_state = NUD_NOARP;
137 neigh->output = neigh->ops->connected_output;
138
139 if ((dev->type == ARPHRD_IPGRE) || (dev->flags & IFF_POINTOPOINT))
140 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
141 else if ((dev->type == ARPHRD_ETHER) || (dev->type == ARPHRD_LOOPBACK))
142 dn_dn2eth(neigh->ha, dn->addr);
143 else {
144 net_dbg_ratelimited("Trying to create neigh for hw %d\n",
145 dev->type);
146 return -EINVAL;
147 }
148
149 /*
150 * Make an estimate of the remote block size by assuming that its
151 * two less then the device mtu, which it true for ethernet (and
152 * other things which support long format headers) since there is
153 * an extra length field (of 16 bits) which isn't part of the
154 * ethernet headers and which the DECnet specs won't admit is part
155 * of the DECnet routing headers either.
156 *
157 * If we over estimate here its no big deal, the NSP negotiations
158 * will prevent us from sending packets which are too large for the
159 * remote node to handle. In any case this figure is normally updated
160 * by a hello message in most cases.
161 */
162 dn->blksize = dev->mtu - 2;
163
164 return 0;
165}
166
167static void dn_neigh_error_report(struct neighbour *neigh, struct sk_buff *skb)
168{
169 printk(KERN_DEBUG "dn_neigh_error_report: called\n");
170 kfree_skb(skb);
171}
172
173static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb)
174{
175 struct dst_entry *dst = skb_dst(skb);
176 struct dn_route *rt = (struct dn_route *)dst;
177 struct net_device *dev = neigh->dev;
178 char mac_addr[ETH_ALEN];
179 unsigned int seq;
180 int err;
181
182 dn_dn2eth(mac_addr, rt->rt_local_src);
183 do {
184 seq = read_seqbegin(&neigh->ha_lock);
185 err = dev_hard_header(skb, dev, ntohs(skb->protocol),
186 neigh->ha, mac_addr, skb->len);
187 } while (read_seqretry(&neigh->ha_lock, seq));
188
189 if (err >= 0)
190 err = dev_queue_xmit(skb);
191 else {
192 kfree_skb(skb);
193 err = -EINVAL;
194 }
195 return err;
196}
197
198static int dn_neigh_output_packet(struct net *net, struct sock *sk, struct sk_buff *skb)
199{
200 struct dst_entry *dst = skb_dst(skb);
201 struct dn_route *rt = (struct dn_route *)dst;
202 struct neighbour *neigh = rt->n;
203
204 return neigh->output(neigh, skb);
205}
206
207/*
208 * For talking to broadcast devices: Ethernet & PPP
209 */
210static int dn_long_output(struct neighbour *neigh, struct sock *sk,
211 struct sk_buff *skb)
212{
213 struct net_device *dev = neigh->dev;
214 int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3;
215 unsigned char *data;
216 struct dn_long_packet *lp;
217 struct dn_skb_cb *cb = DN_SKB_CB(skb);
218
219
220 if (skb_headroom(skb) < headroom) {
221 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
222 if (skb2 == NULL) {
223 net_crit_ratelimited("dn_long_output: no memory\n");
224 kfree_skb(skb);
225 return -ENOBUFS;
226 }
227 consume_skb(skb);
228 skb = skb2;
229 net_info_ratelimited("dn_long_output: Increasing headroom\n");
230 }
231
232 data = skb_push(skb, sizeof(struct dn_long_packet) + 3);
233 lp = (struct dn_long_packet *)(data+3);
234
235 *((__le16 *)data) = cpu_to_le16(skb->len - 2);
236 *(data + 2) = 1 | DN_RT_F_PF; /* Padding */
237
238 lp->msgflg = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS));
239 lp->d_area = lp->d_subarea = 0;
240 dn_dn2eth(lp->d_id, cb->dst);
241 lp->s_area = lp->s_subarea = 0;
242 dn_dn2eth(lp->s_id, cb->src);
243 lp->nl2 = 0;
244 lp->visit_ct = cb->hops & 0x3f;
245 lp->s_class = 0;
246 lp->pt = 0;
247
248 skb_reset_network_header(skb);
249
250 return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING,
251 &init_net, sk, skb, NULL, neigh->dev,
252 dn_neigh_output_packet);
253}
254
255/*
256 * For talking to pointopoint and multidrop devices: DDCMP and X.25
257 */
258static int dn_short_output(struct neighbour *neigh, struct sock *sk,
259 struct sk_buff *skb)
260{
261 struct net_device *dev = neigh->dev;
262 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
263 struct dn_short_packet *sp;
264 unsigned char *data;
265 struct dn_skb_cb *cb = DN_SKB_CB(skb);
266
267
268 if (skb_headroom(skb) < headroom) {
269 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
270 if (skb2 == NULL) {
271 net_crit_ratelimited("dn_short_output: no memory\n");
272 kfree_skb(skb);
273 return -ENOBUFS;
274 }
275 consume_skb(skb);
276 skb = skb2;
277 net_info_ratelimited("dn_short_output: Increasing headroom\n");
278 }
279
280 data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
281 *((__le16 *)data) = cpu_to_le16(skb->len - 2);
282 sp = (struct dn_short_packet *)(data+2);
283
284 sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
285 sp->dstnode = cb->dst;
286 sp->srcnode = cb->src;
287 sp->forward = cb->hops & 0x3f;
288
289 skb_reset_network_header(skb);
290
291 return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING,
292 &init_net, sk, skb, NULL, neigh->dev,
293 dn_neigh_output_packet);
294}
295
296/*
297 * For talking to DECnet phase III nodes
298 * Phase 3 output is the same as short output, execpt that
299 * it clears the area bits before transmission.
300 */
301static int dn_phase3_output(struct neighbour *neigh, struct sock *sk,
302 struct sk_buff *skb)
303{
304 struct net_device *dev = neigh->dev;
305 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
306 struct dn_short_packet *sp;
307 unsigned char *data;
308 struct dn_skb_cb *cb = DN_SKB_CB(skb);
309
310 if (skb_headroom(skb) < headroom) {
311 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
312 if (skb2 == NULL) {
313 net_crit_ratelimited("dn_phase3_output: no memory\n");
314 kfree_skb(skb);
315 return -ENOBUFS;
316 }
317 consume_skb(skb);
318 skb = skb2;
319 net_info_ratelimited("dn_phase3_output: Increasing headroom\n");
320 }
321
322 data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
323 *((__le16 *)data) = cpu_to_le16(skb->len - 2);
324 sp = (struct dn_short_packet *)(data + 2);
325
326 sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
327 sp->dstnode = cb->dst & cpu_to_le16(0x03ff);
328 sp->srcnode = cb->src & cpu_to_le16(0x03ff);
329 sp->forward = cb->hops & 0x3f;
330
331 skb_reset_network_header(skb);
332
333 return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING,
334 &init_net, sk, skb, NULL, neigh->dev,
335 dn_neigh_output_packet);
336}
337
338int dn_to_neigh_output(struct net *net, struct sock *sk, struct sk_buff *skb)
339{
340 struct dst_entry *dst = skb_dst(skb);
341 struct dn_route *rt = (struct dn_route *) dst;
342 struct neighbour *neigh = rt->n;
343 struct dn_neigh *dn = container_of(neigh, struct dn_neigh, n);
344 struct dn_dev *dn_db;
345 bool use_long;
346
347 rcu_read_lock();
348 dn_db = rcu_dereference(neigh->dev->dn_ptr);
349 if (dn_db == NULL) {
350 rcu_read_unlock();
351 return -EINVAL;
352 }
353 use_long = dn_db->use_long;
354 rcu_read_unlock();
355
356 if (dn->flags & DN_NDFLAG_P3)
357 return dn_phase3_output(neigh, sk, skb);
358 if (use_long)
359 return dn_long_output(neigh, sk, skb);
360 else
361 return dn_short_output(neigh, sk, skb);
362}
363
364/*
365 * Unfortunately, the neighbour code uses the device in its hash
366 * function, so we don't get any advantage from it. This function
367 * basically does a neigh_lookup(), but without comparing the device
368 * field. This is required for the On-Ethernet cache
369 */
370
371/*
372 * Pointopoint link receives a hello message
373 */
374void dn_neigh_pointopoint_hello(struct sk_buff *skb)
375{
376 kfree_skb(skb);
377}
378
379/*
380 * Ethernet router hello message received
381 */
382int dn_neigh_router_hello(struct net *net, struct sock *sk, struct sk_buff *skb)
383{
384 struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data;
385
386 struct neighbour *neigh;
387 struct dn_neigh *dn;
388 struct dn_dev *dn_db;
389 __le16 src;
390
391 src = dn_eth2dn(msg->id);
392
393 neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
394
395 dn = container_of(neigh, struct dn_neigh, n);
396
397 if (neigh) {
398 write_lock(&neigh->lock);
399
400 neigh->used = jiffies;
401 dn_db = rcu_dereference(neigh->dev->dn_ptr);
402
403 if (!(neigh->nud_state & NUD_PERMANENT)) {
404 neigh->updated = jiffies;
405
406 if (neigh->dev->type == ARPHRD_ETHER)
407 memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN);
408
409 dn->blksize = le16_to_cpu(msg->blksize);
410 dn->priority = msg->priority;
411
412 dn->flags &= ~DN_NDFLAG_P3;
413
414 switch (msg->iinfo & DN_RT_INFO_TYPE) {
415 case DN_RT_INFO_L1RT:
416 dn->flags &=~DN_NDFLAG_R2;
417 dn->flags |= DN_NDFLAG_R1;
418 break;
419 case DN_RT_INFO_L2RT:
420 dn->flags |= DN_NDFLAG_R2;
421 }
422 }
423
424 /* Only use routers in our area */
425 if ((le16_to_cpu(src)>>10) == (le16_to_cpu((decnet_address))>>10)) {
426 if (!dn_db->router) {
427 dn_db->router = neigh_clone(neigh);
428 } else {
429 if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
430 neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
431 }
432 }
433 write_unlock(&neigh->lock);
434 neigh_release(neigh);
435 }
436
437 kfree_skb(skb);
438 return 0;
439}
440
441/*
442 * Endnode hello message received
443 */
444int dn_neigh_endnode_hello(struct net *net, struct sock *sk, struct sk_buff *skb)
445{
446 struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data;
447 struct neighbour *neigh;
448 struct dn_neigh *dn;
449 __le16 src;
450
451 src = dn_eth2dn(msg->id);
452
453 neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
454
455 dn = container_of(neigh, struct dn_neigh, n);
456
457 if (neigh) {
458 write_lock(&neigh->lock);
459
460 neigh->used = jiffies;
461
462 if (!(neigh->nud_state & NUD_PERMANENT)) {
463 neigh->updated = jiffies;
464
465 if (neigh->dev->type == ARPHRD_ETHER)
466 memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN);
467 dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2);
468 dn->blksize = le16_to_cpu(msg->blksize);
469 dn->priority = 0;
470 }
471
472 write_unlock(&neigh->lock);
473 neigh_release(neigh);
474 }
475
476 kfree_skb(skb);
477 return 0;
478}
479
480static char *dn_find_slot(char *base, int max, int priority)
481{
482 int i;
483 unsigned char *min = NULL;
484
485 base += 6; /* skip first id */
486
487 for(i = 0; i < max; i++) {
488 if (!min || (*base < *min))
489 min = base;
490 base += 7; /* find next priority */
491 }
492
493 if (!min)
494 return NULL;
495
496 return (*min < priority) ? (min - 6) : NULL;
497}
498
499struct elist_cb_state {
500 struct net_device *dev;
501 unsigned char *ptr;
502 unsigned char *rs;
503 int t, n;
504};
505
506static void neigh_elist_cb(struct neighbour *neigh, void *_info)
507{
508 struct elist_cb_state *s = _info;
509 struct dn_neigh *dn;
510
511 if (neigh->dev != s->dev)
512 return;
513
514 dn = container_of(neigh, struct dn_neigh, n);
515 if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2)))
516 return;
517
518 if (s->t == s->n)
519 s->rs = dn_find_slot(s->ptr, s->n, dn->priority);
520 else
521 s->t++;
522 if (s->rs == NULL)
523 return;
524
525 dn_dn2eth(s->rs, dn->addr);
526 s->rs += 6;
527 *(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0;
528 *(s->rs) |= dn->priority;
529 s->rs++;
530}
531
532int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n)
533{
534 struct elist_cb_state state;
535
536 state.dev = dev;
537 state.t = 0;
538 state.n = n;
539 state.ptr = ptr;
540 state.rs = ptr;
541
542 neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state);
543
544 return state.t;
545}
546
547
548#ifdef CONFIG_PROC_FS
549
550static inline void dn_neigh_format_entry(struct seq_file *seq,
551 struct neighbour *n)
552{
553 struct dn_neigh *dn = container_of(n, struct dn_neigh, n);
554 char buf[DN_ASCBUF_LEN];
555
556 read_lock(&n->lock);
557 seq_printf(seq, "%-7s %s%s%s %02x %02d %07ld %-8s\n",
558 dn_addr2asc(le16_to_cpu(dn->addr), buf),
559 (dn->flags&DN_NDFLAG_R1) ? "1" : "-",
560 (dn->flags&DN_NDFLAG_R2) ? "2" : "-",
561 (dn->flags&DN_NDFLAG_P3) ? "3" : "-",
562 dn->n.nud_state,
563 refcount_read(&dn->n.refcnt),
564 dn->blksize,
565 (dn->n.dev) ? dn->n.dev->name : "?");
566 read_unlock(&n->lock);
567}
568
569static int dn_neigh_seq_show(struct seq_file *seq, void *v)
570{
571 if (v == SEQ_START_TOKEN) {
572 seq_puts(seq, "Addr Flags State Use Blksize Dev\n");
573 } else {
574 dn_neigh_format_entry(seq, v);
575 }
576
577 return 0;
578}
579
580static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos)
581{
582 return neigh_seq_start(seq, pos, &dn_neigh_table,
583 NEIGH_SEQ_NEIGH_ONLY);
584}
585
586static const struct seq_operations dn_neigh_seq_ops = {
587 .start = dn_neigh_seq_start,
588 .next = neigh_seq_next,
589 .stop = neigh_seq_stop,
590 .show = dn_neigh_seq_show,
591};
592#endif
593
594void __init dn_neigh_init(void)
595{
596 neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table);
597 proc_create_net("decnet_neigh", 0444, init_net.proc_net,
598 &dn_neigh_seq_ops, sizeof(struct neigh_seq_state));
599}
600
601void __exit dn_neigh_cleanup(void)
602{
603 remove_proc_entry("decnet_neigh", init_net.proc_net);
604 neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table);
605}
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
51static int dn_neigh_construct(struct neighbour *);
52static void dn_long_error_report(struct neighbour *, struct sk_buff *);
53static void dn_short_error_report(struct neighbour *, struct sk_buff *);
54static int dn_long_output(struct neighbour *, struct sk_buff *);
55static int dn_short_output(struct neighbour *, struct sk_buff *);
56static int dn_phase3_output(struct neighbour *, struct sk_buff *);
57
58
59/*
60 * For talking to broadcast devices: Ethernet & PPP
61 */
62static 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 */
72static 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 */
82static 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
89static 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);
94}
95
96struct neigh_table dn_neigh_table = {
97 .family = PF_DECnet,
98 .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 = 3,
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
125static 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 if (net_ratelimit())
166 printk(KERN_DEBUG "Trying to create neigh for hw %d\n", 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
188static 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
195static 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
201static 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 = dst_get_neighbour(dst);
206 struct net_device *dev = neigh->dev;
207 char mac_addr[ETH_ALEN];
208
209 dn_dn2eth(mac_addr, rt->rt_local_src);
210 if (dev_hard_header(skb, dev, ntohs(skb->protocol), neigh->ha,
211 mac_addr, skb->len) >= 0)
212 return dev_queue_xmit(skb);
213
214 if (net_ratelimit())
215 printk(KERN_DEBUG "dn_neigh_output_packet: oops, can't send packet\n");
216
217 kfree_skb(skb);
218 return -EINVAL;
219}
220
221static int dn_long_output(struct neighbour *neigh, struct sk_buff *skb)
222{
223 struct net_device *dev = neigh->dev;
224 int headroom = dev->hard_header_len + sizeof(struct dn_long_packet) + 3;
225 unsigned char *data;
226 struct dn_long_packet *lp;
227 struct dn_skb_cb *cb = DN_SKB_CB(skb);
228
229
230 if (skb_headroom(skb) < headroom) {
231 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
232 if (skb2 == NULL) {
233 if (net_ratelimit())
234 printk(KERN_CRIT "dn_long_output: no memory\n");
235 kfree_skb(skb);
236 return -ENOBUFS;
237 }
238 kfree_skb(skb);
239 skb = skb2;
240 if (net_ratelimit())
241 printk(KERN_INFO "dn_long_output: Increasing headroom\n");
242 }
243
244 data = skb_push(skb, sizeof(struct dn_long_packet) + 3);
245 lp = (struct dn_long_packet *)(data+3);
246
247 *((__le16 *)data) = cpu_to_le16(skb->len - 2);
248 *(data + 2) = 1 | DN_RT_F_PF; /* Padding */
249
250 lp->msgflg = DN_RT_PKT_LONG|(cb->rt_flags&(DN_RT_F_IE|DN_RT_F_RQR|DN_RT_F_RTS));
251 lp->d_area = lp->d_subarea = 0;
252 dn_dn2eth(lp->d_id, cb->dst);
253 lp->s_area = lp->s_subarea = 0;
254 dn_dn2eth(lp->s_id, cb->src);
255 lp->nl2 = 0;
256 lp->visit_ct = cb->hops & 0x3f;
257 lp->s_class = 0;
258 lp->pt = 0;
259
260 skb_reset_network_header(skb);
261
262 return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, skb, NULL,
263 neigh->dev, dn_neigh_output_packet);
264}
265
266static int dn_short_output(struct neighbour *neigh, struct sk_buff *skb)
267{
268 struct net_device *dev = neigh->dev;
269 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
270 struct dn_short_packet *sp;
271 unsigned char *data;
272 struct dn_skb_cb *cb = DN_SKB_CB(skb);
273
274
275 if (skb_headroom(skb) < headroom) {
276 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
277 if (skb2 == NULL) {
278 if (net_ratelimit())
279 printk(KERN_CRIT "dn_short_output: no memory\n");
280 kfree_skb(skb);
281 return -ENOBUFS;
282 }
283 kfree_skb(skb);
284 skb = skb2;
285 if (net_ratelimit())
286 printk(KERN_INFO "dn_short_output: Increasing headroom\n");
287 }
288
289 data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
290 *((__le16 *)data) = cpu_to_le16(skb->len - 2);
291 sp = (struct dn_short_packet *)(data+2);
292
293 sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
294 sp->dstnode = cb->dst;
295 sp->srcnode = cb->src;
296 sp->forward = cb->hops & 0x3f;
297
298 skb_reset_network_header(skb);
299
300 return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, skb, NULL,
301 neigh->dev, dn_neigh_output_packet);
302}
303
304/*
305 * Phase 3 output is the same is short output, execpt that
306 * it clears the area bits before transmission.
307 */
308static int dn_phase3_output(struct neighbour *neigh, struct sk_buff *skb)
309{
310 struct net_device *dev = neigh->dev;
311 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
312 struct dn_short_packet *sp;
313 unsigned char *data;
314 struct dn_skb_cb *cb = DN_SKB_CB(skb);
315
316 if (skb_headroom(skb) < headroom) {
317 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
318 if (skb2 == NULL) {
319 if (net_ratelimit())
320 printk(KERN_CRIT "dn_phase3_output: no memory\n");
321 kfree_skb(skb);
322 return -ENOBUFS;
323 }
324 kfree_skb(skb);
325 skb = skb2;
326 if (net_ratelimit())
327 printk(KERN_INFO "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 */
355void dn_neigh_pointopoint_hello(struct sk_buff *skb)
356{
357 kfree_skb(skb);
358}
359
360/*
361 * Ethernet router hello message received
362 */
363int 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, ð_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 */
425int 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, ð_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
461static 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
480struct elist_cb_state {
481 struct net_device *dev;
482 unsigned char *ptr;
483 unsigned char *rs;
484 int t, n;
485};
486
487static 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
513int 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
531static 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
550static 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
561static 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
567static 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
574static 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
580static 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
590void __init dn_neigh_init(void)
591{
592 neigh_table_init(&dn_neigh_table);
593 proc_net_fops_create(&init_net, "decnet_neigh", S_IRUGO, &dn_neigh_seq_fops);
594}
595
596void __exit dn_neigh_cleanup(void)
597{
598 proc_net_remove(&init_net, "decnet_neigh");
599 neigh_table_clear(&dn_neigh_table);
600}