Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | * | |
429eb0fa | 6 | * DECnet Neighbour Functions (Adjacency Database and |
1da177e4 LT |
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 | ||
1da177e4 LT |
27 | #include <linux/net.h> |
28 | #include <linux/module.h> | |
29 | #include <linux/socket.h> | |
30 | #include <linux/if_arp.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
60063497 | 41 | #include <linux/atomic.h> |
457c4cbc | 42 | #include <net/net_namespace.h> |
1da177e4 LT |
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 | ||
1da177e4 | 51 | static int dn_neigh_construct(struct neighbour *); |
aaa4e704 EB |
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); | |
1da177e4 LT |
54 | |
55 | /* | |
aaa4e704 | 56 | * Operations for adding the link layer header. |
1da177e4 | 57 | */ |
aaa4e704 | 58 | static const struct neigh_ops dn_neigh_ops = { |
1da177e4 | 59 | .family = AF_DECnet, |
aaa4e704 EB |
60 | .error_report = dn_neigh_error_report, |
61 | .output = dn_neigh_output, | |
62 | .connected_output = dn_neigh_output, | |
1da177e4 LT |
63 | }; |
64 | ||
d6bf7817 ED |
65 | static u32 dn_neigh_hash(const void *pkey, |
66 | const struct net_device *dev, | |
2c2aba6c | 67 | __u32 *hash_rnd) |
d6bf7817 | 68 | { |
2c2aba6c | 69 | return jhash_2words(*(__u16 *)pkey, 0, hash_rnd[0]); |
d6bf7817 ED |
70 | } |
71 | ||
60395a20 EB |
72 | static bool dn_key_eq(const struct neighbour *neigh, const void *pkey) |
73 | { | |
74 | return neigh_key_eq16(neigh, pkey); | |
75 | } | |
76 | ||
1da177e4 LT |
77 | struct neigh_table dn_neigh_table = { |
78 | .family = PF_DECnet, | |
daaba4fa | 79 | .entry_size = NEIGH_ENTRY_SIZE(sizeof(struct dn_neigh)), |
c4ea94ab | 80 | .key_len = sizeof(__le16), |
bdf53c58 | 81 | .protocol = cpu_to_be16(ETH_P_DNA_RT), |
1da177e4 | 82 | .hash = dn_neigh_hash, |
60395a20 | 83 | .key_eq = dn_key_eq, |
1da177e4 LT |
84 | .constructor = dn_neigh_construct, |
85 | .id = "dn_neigh_cache", | |
86 | .parms ={ | |
87 | .tbl = &dn_neigh_table, | |
1f9248e5 JP |
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 | }, | |
1da177e4 LT |
103 | }, |
104 | .gc_interval = 30 * HZ, | |
105 | .gc_thresh1 = 128, | |
106 | .gc_thresh2 = 512, | |
107 | .gc_thresh3 = 1024, | |
108 | }; | |
109 | ||
1da177e4 LT |
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); | |
1f07247d | 132 | rcu_read_unlock(); |
1da177e4 | 133 | |
aaa4e704 | 134 | neigh->ops = &dn_neigh_ops; |
1da177e4 LT |
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 { | |
e87cc472 JP |
143 | net_dbg_ratelimited("Trying to create neigh for hw %d\n", |
144 | dev->type); | |
1da177e4 LT |
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 | ||
aaa4e704 | 166 | static void dn_neigh_error_report(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 167 | { |
aaa4e704 | 168 | printk(KERN_DEBUG "dn_neigh_error_report: called\n"); |
1da177e4 LT |
169 | kfree_skb(skb); |
170 | } | |
171 | ||
aaa4e704 | 172 | static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 173 | { |
adf30907 | 174 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 175 | struct dn_route *rt = (struct dn_route *)dst; |
1da177e4 LT |
176 | struct net_device *dev = neigh->dev; |
177 | char mac_addr[ETH_ALEN]; | |
3329bdfc DM |
178 | unsigned int seq; |
179 | int err; | |
1da177e4 LT |
180 | |
181 | dn_dn2eth(mac_addr, rt->rt_local_src); | |
3329bdfc DM |
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; | |
1da177e4 LT |
195 | } |
196 | ||
0c4b51f0 | 197 | static int dn_neigh_output_packet(struct net *net, struct sock *sk, struct sk_buff *skb) |
aaa4e704 EB |
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 | */ | |
7026b1dd DM |
209 | static int dn_long_output(struct neighbour *neigh, struct sock *sk, |
210 | struct sk_buff *skb) | |
1da177e4 | 211 | { |
1da177e4 LT |
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) { | |
e87cc472 | 222 | net_crit_ratelimited("dn_long_output: no memory\n"); |
1da177e4 LT |
223 | kfree_skb(skb); |
224 | return -ENOBUFS; | |
225 | } | |
5d0ba55b | 226 | consume_skb(skb); |
1da177e4 | 227 | skb = skb2; |
e87cc472 | 228 | net_info_ratelimited("dn_long_output: Increasing headroom\n"); |
1da177e4 LT |
229 | } |
230 | ||
231 | data = skb_push(skb, sizeof(struct dn_long_packet) + 3); | |
232 | lp = (struct dn_long_packet *)(data+3); | |
233 | ||
c4106aa8 | 234 | *((__le16 *)data) = cpu_to_le16(skb->len - 2); |
1da177e4 LT |
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; | |
c4ea94ab | 239 | dn_dn2eth(lp->d_id, cb->dst); |
1da177e4 | 240 | lp->s_area = lp->s_subarea = 0; |
c4ea94ab | 241 | dn_dn2eth(lp->s_id, cb->src); |
1da177e4 LT |
242 | lp->nl2 = 0; |
243 | lp->visit_ct = cb->hops & 0x3f; | |
244 | lp->s_class = 0; | |
245 | lp->pt = 0; | |
246 | ||
c1d2bbe1 | 247 | skb_reset_network_header(skb); |
1da177e4 | 248 | |
29a26a56 EB |
249 | return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, |
250 | &init_net, sk, skb, NULL, neigh->dev, | |
251 | dn_neigh_output_packet); | |
1da177e4 LT |
252 | } |
253 | ||
aaa4e704 EB |
254 | /* |
255 | * For talking to pointopoint and multidrop devices: DDCMP and X.25 | |
256 | */ | |
7026b1dd DM |
257 | static int dn_short_output(struct neighbour *neigh, struct sock *sk, |
258 | struct sk_buff *skb) | |
1da177e4 | 259 | { |
1da177e4 LT |
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 | ||
429eb0fa YH |
267 | if (skb_headroom(skb) < headroom) { |
268 | struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); | |
269 | if (skb2 == NULL) { | |
e87cc472 | 270 | net_crit_ratelimited("dn_short_output: no memory\n"); |
429eb0fa YH |
271 | kfree_skb(skb); |
272 | return -ENOBUFS; | |
273 | } | |
5d0ba55b | 274 | consume_skb(skb); |
429eb0fa | 275 | skb = skb2; |
e87cc472 | 276 | net_info_ratelimited("dn_short_output: Increasing headroom\n"); |
429eb0fa | 277 | } |
1da177e4 LT |
278 | |
279 | data = skb_push(skb, sizeof(struct dn_short_packet) + 2); | |
c4106aa8 | 280 | *((__le16 *)data) = cpu_to_le16(skb->len - 2); |
1da177e4 LT |
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 | ||
c1d2bbe1 | 288 | skb_reset_network_header(skb); |
1da177e4 | 289 | |
29a26a56 EB |
290 | return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, |
291 | &init_net, sk, skb, NULL, neigh->dev, | |
292 | dn_neigh_output_packet); | |
1da177e4 LT |
293 | } |
294 | ||
295 | /* | |
aaa4e704 EB |
296 | * For talking to DECnet phase III nodes |
297 | * Phase 3 output is the same as short output, execpt that | |
1da177e4 LT |
298 | * it clears the area bits before transmission. |
299 | */ | |
7026b1dd DM |
300 | static int dn_phase3_output(struct neighbour *neigh, struct sock *sk, |
301 | struct sk_buff *skb) | |
1da177e4 | 302 | { |
1da177e4 LT |
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) { | |
e87cc472 | 312 | net_crit_ratelimited("dn_phase3_output: no memory\n"); |
1da177e4 LT |
313 | kfree_skb(skb); |
314 | return -ENOBUFS; | |
315 | } | |
5d0ba55b | 316 | consume_skb(skb); |
1da177e4 | 317 | skb = skb2; |
e87cc472 | 318 | net_info_ratelimited("dn_phase3_output: Increasing headroom\n"); |
1da177e4 LT |
319 | } |
320 | ||
321 | data = skb_push(skb, sizeof(struct dn_short_packet) + 2); | |
c4106aa8 | 322 | *((__le16 *)data) = cpu_to_le16(skb->len - 2); |
1da177e4 LT |
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)); | |
c4106aa8 HH |
326 | sp->dstnode = cb->dst & cpu_to_le16(0x03ff); |
327 | sp->srcnode = cb->src & cpu_to_le16(0x03ff); | |
1da177e4 LT |
328 | sp->forward = cb->hops & 0x3f; |
329 | ||
c1d2bbe1 | 330 | skb_reset_network_header(skb); |
1da177e4 | 331 | |
29a26a56 EB |
332 | return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, |
333 | &init_net, sk, skb, NULL, neigh->dev, | |
334 | dn_neigh_output_packet); | |
1da177e4 LT |
335 | } |
336 | ||
0c4b51f0 | 337 | int dn_to_neigh_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
aaa4e704 EB |
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) | |
7026b1dd | 356 | return dn_phase3_output(neigh, sk, skb); |
aaa4e704 | 357 | if (use_long) |
7026b1dd | 358 | return dn_long_output(neigh, sk, skb); |
aaa4e704 | 359 | else |
7026b1dd | 360 | return dn_short_output(neigh, sk, skb); |
aaa4e704 EB |
361 | } |
362 | ||
1da177e4 LT |
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 | */ | |
373 | void dn_neigh_pointopoint_hello(struct sk_buff *skb) | |
374 | { | |
375 | kfree_skb(skb); | |
376 | } | |
377 | ||
378 | /* | |
379 | * Ethernet router hello message received | |
380 | */ | |
0c4b51f0 | 381 | int dn_neigh_router_hello(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
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; | |
c4ea94ab | 388 | __le16 src; |
1da177e4 | 389 | |
c4ea94ab | 390 | src = dn_eth2dn(msg->id); |
1da177e4 LT |
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; | |
fc766e4c | 400 | dn_db = rcu_dereference(neigh->dev->dn_ptr); |
1da177e4 LT |
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 | ||
c4106aa8 | 408 | dn->blksize = le16_to_cpu(msg->blksize); |
1da177e4 LT |
409 | dn->priority = msg->priority; |
410 | ||
411 | dn->flags &= ~DN_NDFLAG_P3; | |
412 | ||
06f8fe11 JP |
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; | |
1da177e4 LT |
420 | } |
421 | } | |
422 | ||
5062430c | 423 | /* Only use routers in our area */ |
c4106aa8 | 424 | if ((le16_to_cpu(src)>>10) == (le16_to_cpu((decnet_address))>>10)) { |
5062430c PC |
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 | } | |
1da177e4 LT |
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 | */ | |
0c4b51f0 | 443 | int dn_neigh_endnode_hello(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
444 | { |
445 | struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data; | |
446 | struct neighbour *neigh; | |
447 | struct dn_neigh *dn; | |
c4ea94ab | 448 | __le16 src; |
1da177e4 | 449 | |
c4ea94ab | 450 | src = dn_eth2dn(msg->id); |
1da177e4 LT |
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); | |
c4106aa8 | 467 | dn->blksize = le16_to_cpu(msg->blksize); |
1da177e4 LT |
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 | ||
479 | static 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 | ||
498 | struct elist_cb_state { | |
499 | struct net_device *dev; | |
500 | unsigned char *ptr; | |
501 | unsigned char *rs; | |
502 | int t, n; | |
503 | }; | |
504 | ||
505 | static void neigh_elist_cb(struct neighbour *neigh, void *_info) | |
506 | { | |
507 | struct elist_cb_state *s = _info; | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
531 | int 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 | ||
549 | static 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", | |
c4106aa8 | 557 | dn_addr2asc(le16_to_cpu(dn->addr), buf), |
1da177e4 LT |
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 | ||
568 | static 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 | ||
579 | static 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 | ||
56b3d975 | 585 | static const struct seq_operations dn_neigh_seq_ops = { |
1da177e4 LT |
586 | .start = dn_neigh_seq_start, |
587 | .next = neigh_seq_next, | |
588 | .stop = neigh_seq_stop, | |
589 | .show = dn_neigh_seq_show, | |
590 | }; | |
591 | ||
592 | static int dn_neigh_seq_open(struct inode *inode, struct file *file) | |
593 | { | |
426b5303 EB |
594 | return seq_open_net(inode, file, &dn_neigh_seq_ops, |
595 | sizeof(struct neigh_seq_state)); | |
1da177e4 LT |
596 | } |
597 | ||
9a32144e | 598 | static const struct file_operations dn_neigh_seq_fops = { |
1da177e4 LT |
599 | .owner = THIS_MODULE, |
600 | .open = dn_neigh_seq_open, | |
601 | .read = seq_read, | |
602 | .llseek = seq_lseek, | |
426b5303 | 603 | .release = seq_release_net, |
1da177e4 LT |
604 | }; |
605 | ||
606 | #endif | |
607 | ||
608 | void __init dn_neigh_init(void) | |
609 | { | |
d7480fd3 | 610 | neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table); |
d4beaa66 G |
611 | proc_create("decnet_neigh", S_IRUGO, init_net.proc_net, |
612 | &dn_neigh_seq_fops); | |
1da177e4 LT |
613 | } |
614 | ||
615 | void __exit dn_neigh_cleanup(void) | |
616 | { | |
ece31ffd | 617 | remove_proc_entry("decnet_neigh", init_net.proc_net); |
d7480fd3 | 618 | neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table); |
1da177e4 | 619 | } |