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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_neigh_error_report(struct neighbour *, struct sk_buff *);
53static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb);
54
55/*
56 * Operations for adding the link layer header.
57 */
58static 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
65static 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
72static bool dn_key_eq(const struct neighbour *neigh, const void *pkey)
73{
74 return neigh_key_eq16(neigh, pkey);
75}
76
77struct 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
110static 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
166static 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
172static 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
197static int dn_neigh_output_packet(struct net *net, 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 */
209static 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,
250 &init_net, sk, skb, NULL, neigh->dev,
251 dn_neigh_output_packet);
252}
253
254/*
255 * For talking to pointopoint and multidrop devices: DDCMP and X.25
256 */
257static int dn_short_output(struct neighbour *neigh, struct sock *sk,
258 struct sk_buff *skb)
259{
260 struct net_device *dev = neigh->dev;
261 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
262 struct dn_short_packet *sp;
263 unsigned char *data;
264 struct dn_skb_cb *cb = DN_SKB_CB(skb);
265
266
267 if (skb_headroom(skb) < headroom) {
268 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
269 if (skb2 == NULL) {
270 net_crit_ratelimited("dn_short_output: no memory\n");
271 kfree_skb(skb);
272 return -ENOBUFS;
273 }
274 consume_skb(skb);
275 skb = skb2;
276 net_info_ratelimited("dn_short_output: Increasing headroom\n");
277 }
278
279 data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
280 *((__le16 *)data) = cpu_to_le16(skb->len - 2);
281 sp = (struct dn_short_packet *)(data+2);
282
283 sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
284 sp->dstnode = cb->dst;
285 sp->srcnode = cb->src;
286 sp->forward = cb->hops & 0x3f;
287
288 skb_reset_network_header(skb);
289
290 return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING,
291 &init_net, sk, skb, NULL, neigh->dev,
292 dn_neigh_output_packet);
293}
294
295/*
296 * For talking to DECnet phase III nodes
297 * Phase 3 output is the same as short output, execpt that
298 * it clears the area bits before transmission.
299 */
300static int dn_phase3_output(struct neighbour *neigh, struct sock *sk,
301 struct sk_buff *skb)
302{
303 struct net_device *dev = neigh->dev;
304 int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2;
305 struct dn_short_packet *sp;
306 unsigned char *data;
307 struct dn_skb_cb *cb = DN_SKB_CB(skb);
308
309 if (skb_headroom(skb) < headroom) {
310 struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom);
311 if (skb2 == NULL) {
312 net_crit_ratelimited("dn_phase3_output: no memory\n");
313 kfree_skb(skb);
314 return -ENOBUFS;
315 }
316 consume_skb(skb);
317 skb = skb2;
318 net_info_ratelimited("dn_phase3_output: Increasing headroom\n");
319 }
320
321 data = skb_push(skb, sizeof(struct dn_short_packet) + 2);
322 *((__le16 *)data) = cpu_to_le16(skb->len - 2);
323 sp = (struct dn_short_packet *)(data + 2);
324
325 sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS));
326 sp->dstnode = cb->dst & cpu_to_le16(0x03ff);
327 sp->srcnode = cb->src & cpu_to_le16(0x03ff);
328 sp->forward = cb->hops & 0x3f;
329
330 skb_reset_network_header(skb);
331
332 return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING,
333 &init_net, sk, skb, NULL, neigh->dev,
334 dn_neigh_output_packet);
335}
336
337int dn_to_neigh_output(struct net *net, struct sock *sk, struct sk_buff *skb)
338{
339 struct dst_entry *dst = skb_dst(skb);
340 struct dn_route *rt = (struct dn_route *) dst;
341 struct neighbour *neigh = rt->n;
342 struct dn_neigh *dn = (struct dn_neigh *)neigh;
343 struct dn_dev *dn_db;
344 bool use_long;
345
346 rcu_read_lock();
347 dn_db = rcu_dereference(neigh->dev->dn_ptr);
348 if (dn_db == NULL) {
349 rcu_read_unlock();
350 return -EINVAL;
351 }
352 use_long = dn_db->use_long;
353 rcu_read_unlock();
354
355 if (dn->flags & DN_NDFLAG_P3)
356 return dn_phase3_output(neigh, sk, skb);
357 if (use_long)
358 return dn_long_output(neigh, sk, skb);
359 else
360 return dn_short_output(neigh, sk, skb);
361}
362
363/*
364 * Unfortunately, the neighbour code uses the device in its hash
365 * function, so we don't get any advantage from it. This function
366 * basically does a neigh_lookup(), but without comparing the device
367 * field. This is required for the On-Ethernet cache
368 */
369
370/*
371 * Pointopoint link receives a hello message
372 */
373void dn_neigh_pointopoint_hello(struct sk_buff *skb)
374{
375 kfree_skb(skb);
376}
377
378/*
379 * Ethernet router hello message received
380 */
381int dn_neigh_router_hello(struct net *net, struct sock *sk, struct sk_buff *skb)
382{
383 struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data;
384
385 struct neighbour *neigh;
386 struct dn_neigh *dn;
387 struct dn_dev *dn_db;
388 __le16 src;
389
390 src = dn_eth2dn(msg->id);
391
392 neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
393
394 dn = (struct dn_neigh *)neigh;
395
396 if (neigh) {
397 write_lock(&neigh->lock);
398
399 neigh->used = jiffies;
400 dn_db = rcu_dereference(neigh->dev->dn_ptr);
401
402 if (!(neigh->nud_state & NUD_PERMANENT)) {
403 neigh->updated = jiffies;
404
405 if (neigh->dev->type == ARPHRD_ETHER)
406 memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN);
407
408 dn->blksize = le16_to_cpu(msg->blksize);
409 dn->priority = msg->priority;
410
411 dn->flags &= ~DN_NDFLAG_P3;
412
413 switch (msg->iinfo & DN_RT_INFO_TYPE) {
414 case DN_RT_INFO_L1RT:
415 dn->flags &=~DN_NDFLAG_R2;
416 dn->flags |= DN_NDFLAG_R1;
417 break;
418 case DN_RT_INFO_L2RT:
419 dn->flags |= DN_NDFLAG_R2;
420 }
421 }
422
423 /* Only use routers in our area */
424 if ((le16_to_cpu(src)>>10) == (le16_to_cpu((decnet_address))>>10)) {
425 if (!dn_db->router) {
426 dn_db->router = neigh_clone(neigh);
427 } else {
428 if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
429 neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
430 }
431 }
432 write_unlock(&neigh->lock);
433 neigh_release(neigh);
434 }
435
436 kfree_skb(skb);
437 return 0;
438}
439
440/*
441 * Endnode hello message received
442 */
443int dn_neigh_endnode_hello(struct net *net, struct sock *sk, struct sk_buff *skb)
444{
445 struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data;
446 struct neighbour *neigh;
447 struct dn_neigh *dn;
448 __le16 src;
449
450 src = dn_eth2dn(msg->id);
451
452 neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1);
453
454 dn = (struct dn_neigh *)neigh;
455
456 if (neigh) {
457 write_lock(&neigh->lock);
458
459 neigh->used = jiffies;
460
461 if (!(neigh->nud_state & NUD_PERMANENT)) {
462 neigh->updated = jiffies;
463
464 if (neigh->dev->type == ARPHRD_ETHER)
465 memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN);
466 dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2);
467 dn->blksize = le16_to_cpu(msg->blksize);
468 dn->priority = 0;
469 }
470
471 write_unlock(&neigh->lock);
472 neigh_release(neigh);
473 }
474
475 kfree_skb(skb);
476 return 0;
477}
478
479static char *dn_find_slot(char *base, int max, int priority)
480{
481 int i;
482 unsigned char *min = NULL;
483
484 base += 6; /* skip first id */
485
486 for(i = 0; i < max; i++) {
487 if (!min || (*base < *min))
488 min = base;
489 base += 7; /* find next priority */
490 }
491
492 if (!min)
493 return NULL;
494
495 return (*min < priority) ? (min - 6) : NULL;
496}
497
498struct elist_cb_state {
499 struct net_device *dev;
500 unsigned char *ptr;
501 unsigned char *rs;
502 int t, n;
503};
504
505static void neigh_elist_cb(struct neighbour *neigh, void *_info)
506{
507 struct elist_cb_state *s = _info;
508 struct dn_neigh *dn;
509
510 if (neigh->dev != s->dev)
511 return;
512
513 dn = (struct dn_neigh *) neigh;
514 if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2)))
515 return;
516
517 if (s->t == s->n)
518 s->rs = dn_find_slot(s->ptr, s->n, dn->priority);
519 else
520 s->t++;
521 if (s->rs == NULL)
522 return;
523
524 dn_dn2eth(s->rs, dn->addr);
525 s->rs += 6;
526 *(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0;
527 *(s->rs) |= dn->priority;
528 s->rs++;
529}
530
531int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n)
532{
533 struct elist_cb_state state;
534
535 state.dev = dev;
536 state.t = 0;
537 state.n = n;
538 state.ptr = ptr;
539 state.rs = ptr;
540
541 neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state);
542
543 return state.t;
544}
545
546
547#ifdef CONFIG_PROC_FS
548
549static inline void dn_neigh_format_entry(struct seq_file *seq,
550 struct neighbour *n)
551{
552 struct dn_neigh *dn = (struct dn_neigh *) n;
553 char buf[DN_ASCBUF_LEN];
554
555 read_lock(&n->lock);
556 seq_printf(seq, "%-7s %s%s%s %02x %02d %07ld %-8s\n",
557 dn_addr2asc(le16_to_cpu(dn->addr), buf),
558 (dn->flags&DN_NDFLAG_R1) ? "1" : "-",
559 (dn->flags&DN_NDFLAG_R2) ? "2" : "-",
560 (dn->flags&DN_NDFLAG_P3) ? "3" : "-",
561 dn->n.nud_state,
562 atomic_read(&dn->n.refcnt),
563 dn->blksize,
564 (dn->n.dev) ? dn->n.dev->name : "?");
565 read_unlock(&n->lock);
566}
567
568static int dn_neigh_seq_show(struct seq_file *seq, void *v)
569{
570 if (v == SEQ_START_TOKEN) {
571 seq_puts(seq, "Addr Flags State Use Blksize Dev\n");
572 } else {
573 dn_neigh_format_entry(seq, v);
574 }
575
576 return 0;
577}
578
579static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos)
580{
581 return neigh_seq_start(seq, pos, &dn_neigh_table,
582 NEIGH_SEQ_NEIGH_ONLY);
583}
584
585static const struct seq_operations dn_neigh_seq_ops = {
586 .start = dn_neigh_seq_start,
587 .next = neigh_seq_next,
588 .stop = neigh_seq_stop,
589 .show = dn_neigh_seq_show,
590};
591
592static int dn_neigh_seq_open(struct inode *inode, struct file *file)
593{
594 return seq_open_net(inode, file, &dn_neigh_seq_ops,
595 sizeof(struct neigh_seq_state));
596}
597
598static const struct file_operations dn_neigh_seq_fops = {
599 .owner = THIS_MODULE,
600 .open = dn_neigh_seq_open,
601 .read = seq_read,
602 .llseek = seq_lseek,
603 .release = seq_release_net,
604};
605
606#endif
607
608void __init dn_neigh_init(void)
609{
610 neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table);
611 proc_create("decnet_neigh", S_IRUGO, init_net.proc_net,
612 &dn_neigh_seq_fops);
613}
614
615void __exit dn_neigh_cleanup(void)
616{
617 remove_proc_entry("decnet_neigh", init_net.proc_net);
618 neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table);
619}