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 | ||
7026b1dd | 197 | static int dn_neigh_output_packet(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 | |
7026b1dd DM |
249 | return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, sk, skb, |
250 | NULL, neigh->dev, dn_neigh_output_packet); | |
1da177e4 LT |
251 | } |
252 | ||
aaa4e704 EB |
253 | /* |
254 | * For talking to pointopoint and multidrop devices: DDCMP and X.25 | |
255 | */ | |
7026b1dd DM |
256 | static int dn_short_output(struct neighbour *neigh, struct sock *sk, |
257 | struct sk_buff *skb) | |
1da177e4 | 258 | { |
1da177e4 LT |
259 | struct net_device *dev = neigh->dev; |
260 | int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2; | |
261 | struct dn_short_packet *sp; | |
262 | unsigned char *data; | |
263 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
264 | ||
265 | ||
429eb0fa YH |
266 | if (skb_headroom(skb) < headroom) { |
267 | struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); | |
268 | if (skb2 == NULL) { | |
e87cc472 | 269 | net_crit_ratelimited("dn_short_output: no memory\n"); |
429eb0fa YH |
270 | kfree_skb(skb); |
271 | return -ENOBUFS; | |
272 | } | |
5d0ba55b | 273 | consume_skb(skb); |
429eb0fa | 274 | skb = skb2; |
e87cc472 | 275 | net_info_ratelimited("dn_short_output: Increasing headroom\n"); |
429eb0fa | 276 | } |
1da177e4 LT |
277 | |
278 | data = skb_push(skb, sizeof(struct dn_short_packet) + 2); | |
c4106aa8 | 279 | *((__le16 *)data) = cpu_to_le16(skb->len - 2); |
1da177e4 LT |
280 | sp = (struct dn_short_packet *)(data+2); |
281 | ||
282 | sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS)); | |
283 | sp->dstnode = cb->dst; | |
284 | sp->srcnode = cb->src; | |
285 | sp->forward = cb->hops & 0x3f; | |
286 | ||
c1d2bbe1 | 287 | skb_reset_network_header(skb); |
1da177e4 | 288 | |
7026b1dd DM |
289 | return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, sk, skb, |
290 | NULL, neigh->dev, dn_neigh_output_packet); | |
1da177e4 LT |
291 | } |
292 | ||
293 | /* | |
aaa4e704 EB |
294 | * For talking to DECnet phase III nodes |
295 | * Phase 3 output is the same as short output, execpt that | |
1da177e4 LT |
296 | * it clears the area bits before transmission. |
297 | */ | |
7026b1dd DM |
298 | static int dn_phase3_output(struct neighbour *neigh, struct sock *sk, |
299 | struct sk_buff *skb) | |
1da177e4 | 300 | { |
1da177e4 LT |
301 | struct net_device *dev = neigh->dev; |
302 | int headroom = dev->hard_header_len + sizeof(struct dn_short_packet) + 2; | |
303 | struct dn_short_packet *sp; | |
304 | unsigned char *data; | |
305 | struct dn_skb_cb *cb = DN_SKB_CB(skb); | |
306 | ||
307 | if (skb_headroom(skb) < headroom) { | |
308 | struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); | |
309 | if (skb2 == NULL) { | |
e87cc472 | 310 | net_crit_ratelimited("dn_phase3_output: no memory\n"); |
1da177e4 LT |
311 | kfree_skb(skb); |
312 | return -ENOBUFS; | |
313 | } | |
5d0ba55b | 314 | consume_skb(skb); |
1da177e4 | 315 | skb = skb2; |
e87cc472 | 316 | net_info_ratelimited("dn_phase3_output: Increasing headroom\n"); |
1da177e4 LT |
317 | } |
318 | ||
319 | data = skb_push(skb, sizeof(struct dn_short_packet) + 2); | |
c4106aa8 | 320 | *((__le16 *)data) = cpu_to_le16(skb->len - 2); |
1da177e4 LT |
321 | sp = (struct dn_short_packet *)(data + 2); |
322 | ||
323 | sp->msgflg = DN_RT_PKT_SHORT|(cb->rt_flags&(DN_RT_F_RQR|DN_RT_F_RTS)); | |
c4106aa8 HH |
324 | sp->dstnode = cb->dst & cpu_to_le16(0x03ff); |
325 | sp->srcnode = cb->src & cpu_to_le16(0x03ff); | |
1da177e4 LT |
326 | sp->forward = cb->hops & 0x3f; |
327 | ||
c1d2bbe1 | 328 | skb_reset_network_header(skb); |
1da177e4 | 329 | |
7026b1dd DM |
330 | return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, sk, skb, |
331 | NULL, neigh->dev, dn_neigh_output_packet); | |
1da177e4 LT |
332 | } |
333 | ||
7026b1dd | 334 | int dn_to_neigh_output(struct sock *sk, struct sk_buff *skb) |
aaa4e704 EB |
335 | { |
336 | struct dst_entry *dst = skb_dst(skb); | |
337 | struct dn_route *rt = (struct dn_route *) dst; | |
338 | struct neighbour *neigh = rt->n; | |
339 | struct dn_neigh *dn = (struct dn_neigh *)neigh; | |
340 | struct dn_dev *dn_db; | |
341 | bool use_long; | |
342 | ||
343 | rcu_read_lock(); | |
344 | dn_db = rcu_dereference(neigh->dev->dn_ptr); | |
345 | if (dn_db == NULL) { | |
346 | rcu_read_unlock(); | |
347 | return -EINVAL; | |
348 | } | |
349 | use_long = dn_db->use_long; | |
350 | rcu_read_unlock(); | |
351 | ||
352 | if (dn->flags & DN_NDFLAG_P3) | |
7026b1dd | 353 | return dn_phase3_output(neigh, sk, skb); |
aaa4e704 | 354 | if (use_long) |
7026b1dd | 355 | return dn_long_output(neigh, sk, skb); |
aaa4e704 | 356 | else |
7026b1dd | 357 | return dn_short_output(neigh, sk, skb); |
aaa4e704 EB |
358 | } |
359 | ||
1da177e4 LT |
360 | /* |
361 | * Unfortunately, the neighbour code uses the device in its hash | |
362 | * function, so we don't get any advantage from it. This function | |
363 | * basically does a neigh_lookup(), but without comparing the device | |
364 | * field. This is required for the On-Ethernet cache | |
365 | */ | |
366 | ||
367 | /* | |
368 | * Pointopoint link receives a hello message | |
369 | */ | |
370 | void dn_neigh_pointopoint_hello(struct sk_buff *skb) | |
371 | { | |
372 | kfree_skb(skb); | |
373 | } | |
374 | ||
375 | /* | |
376 | * Ethernet router hello message received | |
377 | */ | |
7026b1dd | 378 | int dn_neigh_router_hello(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
379 | { |
380 | struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data; | |
381 | ||
382 | struct neighbour *neigh; | |
383 | struct dn_neigh *dn; | |
384 | struct dn_dev *dn_db; | |
c4ea94ab | 385 | __le16 src; |
1da177e4 | 386 | |
c4ea94ab | 387 | src = dn_eth2dn(msg->id); |
1da177e4 LT |
388 | |
389 | neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); | |
390 | ||
391 | dn = (struct dn_neigh *)neigh; | |
392 | ||
393 | if (neigh) { | |
394 | write_lock(&neigh->lock); | |
395 | ||
396 | neigh->used = jiffies; | |
fc766e4c | 397 | dn_db = rcu_dereference(neigh->dev->dn_ptr); |
1da177e4 LT |
398 | |
399 | if (!(neigh->nud_state & NUD_PERMANENT)) { | |
400 | neigh->updated = jiffies; | |
401 | ||
402 | if (neigh->dev->type == ARPHRD_ETHER) | |
403 | memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN); | |
404 | ||
c4106aa8 | 405 | dn->blksize = le16_to_cpu(msg->blksize); |
1da177e4 LT |
406 | dn->priority = msg->priority; |
407 | ||
408 | dn->flags &= ~DN_NDFLAG_P3; | |
409 | ||
06f8fe11 JP |
410 | switch (msg->iinfo & DN_RT_INFO_TYPE) { |
411 | case DN_RT_INFO_L1RT: | |
412 | dn->flags &=~DN_NDFLAG_R2; | |
413 | dn->flags |= DN_NDFLAG_R1; | |
414 | break; | |
415 | case DN_RT_INFO_L2RT: | |
416 | dn->flags |= DN_NDFLAG_R2; | |
1da177e4 LT |
417 | } |
418 | } | |
419 | ||
5062430c | 420 | /* Only use routers in our area */ |
c4106aa8 | 421 | if ((le16_to_cpu(src)>>10) == (le16_to_cpu((decnet_address))>>10)) { |
5062430c PC |
422 | if (!dn_db->router) { |
423 | dn_db->router = neigh_clone(neigh); | |
424 | } else { | |
425 | if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority) | |
426 | neigh_release(xchg(&dn_db->router, neigh_clone(neigh))); | |
427 | } | |
1da177e4 LT |
428 | } |
429 | write_unlock(&neigh->lock); | |
430 | neigh_release(neigh); | |
431 | } | |
432 | ||
433 | kfree_skb(skb); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | /* | |
438 | * Endnode hello message received | |
439 | */ | |
7026b1dd | 440 | int dn_neigh_endnode_hello(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
441 | { |
442 | struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data; | |
443 | struct neighbour *neigh; | |
444 | struct dn_neigh *dn; | |
c4ea94ab | 445 | __le16 src; |
1da177e4 | 446 | |
c4ea94ab | 447 | src = dn_eth2dn(msg->id); |
1da177e4 LT |
448 | |
449 | neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); | |
450 | ||
451 | dn = (struct dn_neigh *)neigh; | |
452 | ||
453 | if (neigh) { | |
454 | write_lock(&neigh->lock); | |
455 | ||
456 | neigh->used = jiffies; | |
457 | ||
458 | if (!(neigh->nud_state & NUD_PERMANENT)) { | |
459 | neigh->updated = jiffies; | |
460 | ||
461 | if (neigh->dev->type == ARPHRD_ETHER) | |
462 | memcpy(neigh->ha, ð_hdr(skb)->h_source, ETH_ALEN); | |
463 | dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2); | |
c4106aa8 | 464 | dn->blksize = le16_to_cpu(msg->blksize); |
1da177e4 LT |
465 | dn->priority = 0; |
466 | } | |
467 | ||
468 | write_unlock(&neigh->lock); | |
469 | neigh_release(neigh); | |
470 | } | |
471 | ||
472 | kfree_skb(skb); | |
473 | return 0; | |
474 | } | |
475 | ||
476 | static char *dn_find_slot(char *base, int max, int priority) | |
477 | { | |
478 | int i; | |
479 | unsigned char *min = NULL; | |
480 | ||
481 | base += 6; /* skip first id */ | |
482 | ||
483 | for(i = 0; i < max; i++) { | |
484 | if (!min || (*base < *min)) | |
485 | min = base; | |
486 | base += 7; /* find next priority */ | |
487 | } | |
488 | ||
489 | if (!min) | |
490 | return NULL; | |
491 | ||
492 | return (*min < priority) ? (min - 6) : NULL; | |
493 | } | |
494 | ||
495 | struct elist_cb_state { | |
496 | struct net_device *dev; | |
497 | unsigned char *ptr; | |
498 | unsigned char *rs; | |
499 | int t, n; | |
500 | }; | |
501 | ||
502 | static void neigh_elist_cb(struct neighbour *neigh, void *_info) | |
503 | { | |
504 | struct elist_cb_state *s = _info; | |
1da177e4 LT |
505 | struct dn_neigh *dn; |
506 | ||
507 | if (neigh->dev != s->dev) | |
508 | return; | |
509 | ||
510 | dn = (struct dn_neigh *) neigh; | |
511 | if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2))) | |
512 | return; | |
513 | ||
1da177e4 LT |
514 | if (s->t == s->n) |
515 | s->rs = dn_find_slot(s->ptr, s->n, dn->priority); | |
516 | else | |
517 | s->t++; | |
518 | if (s->rs == NULL) | |
519 | return; | |
520 | ||
521 | dn_dn2eth(s->rs, dn->addr); | |
522 | s->rs += 6; | |
523 | *(s->rs) = neigh->nud_state & NUD_CONNECTED ? 0x80 : 0x0; | |
524 | *(s->rs) |= dn->priority; | |
525 | s->rs++; | |
526 | } | |
527 | ||
528 | int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n) | |
529 | { | |
530 | struct elist_cb_state state; | |
531 | ||
532 | state.dev = dev; | |
533 | state.t = 0; | |
534 | state.n = n; | |
535 | state.ptr = ptr; | |
536 | state.rs = ptr; | |
537 | ||
538 | neigh_for_each(&dn_neigh_table, neigh_elist_cb, &state); | |
539 | ||
540 | return state.t; | |
541 | } | |
542 | ||
543 | ||
544 | #ifdef CONFIG_PROC_FS | |
545 | ||
546 | static inline void dn_neigh_format_entry(struct seq_file *seq, | |
547 | struct neighbour *n) | |
548 | { | |
549 | struct dn_neigh *dn = (struct dn_neigh *) n; | |
550 | char buf[DN_ASCBUF_LEN]; | |
551 | ||
552 | read_lock(&n->lock); | |
553 | seq_printf(seq, "%-7s %s%s%s %02x %02d %07ld %-8s\n", | |
c4106aa8 | 554 | dn_addr2asc(le16_to_cpu(dn->addr), buf), |
1da177e4 LT |
555 | (dn->flags&DN_NDFLAG_R1) ? "1" : "-", |
556 | (dn->flags&DN_NDFLAG_R2) ? "2" : "-", | |
557 | (dn->flags&DN_NDFLAG_P3) ? "3" : "-", | |
558 | dn->n.nud_state, | |
559 | atomic_read(&dn->n.refcnt), | |
560 | dn->blksize, | |
561 | (dn->n.dev) ? dn->n.dev->name : "?"); | |
562 | read_unlock(&n->lock); | |
563 | } | |
564 | ||
565 | static int dn_neigh_seq_show(struct seq_file *seq, void *v) | |
566 | { | |
567 | if (v == SEQ_START_TOKEN) { | |
568 | seq_puts(seq, "Addr Flags State Use Blksize Dev\n"); | |
569 | } else { | |
570 | dn_neigh_format_entry(seq, v); | |
571 | } | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | static void *dn_neigh_seq_start(struct seq_file *seq, loff_t *pos) | |
577 | { | |
578 | return neigh_seq_start(seq, pos, &dn_neigh_table, | |
579 | NEIGH_SEQ_NEIGH_ONLY); | |
580 | } | |
581 | ||
56b3d975 | 582 | static const struct seq_operations dn_neigh_seq_ops = { |
1da177e4 LT |
583 | .start = dn_neigh_seq_start, |
584 | .next = neigh_seq_next, | |
585 | .stop = neigh_seq_stop, | |
586 | .show = dn_neigh_seq_show, | |
587 | }; | |
588 | ||
589 | static int dn_neigh_seq_open(struct inode *inode, struct file *file) | |
590 | { | |
426b5303 EB |
591 | return seq_open_net(inode, file, &dn_neigh_seq_ops, |
592 | sizeof(struct neigh_seq_state)); | |
1da177e4 LT |
593 | } |
594 | ||
9a32144e | 595 | static const struct file_operations dn_neigh_seq_fops = { |
1da177e4 LT |
596 | .owner = THIS_MODULE, |
597 | .open = dn_neigh_seq_open, | |
598 | .read = seq_read, | |
599 | .llseek = seq_lseek, | |
426b5303 | 600 | .release = seq_release_net, |
1da177e4 LT |
601 | }; |
602 | ||
603 | #endif | |
604 | ||
605 | void __init dn_neigh_init(void) | |
606 | { | |
d7480fd3 | 607 | neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table); |
d4beaa66 G |
608 | proc_create("decnet_neigh", S_IRUGO, init_net.proc_net, |
609 | &dn_neigh_seq_fops); | |
1da177e4 LT |
610 | } |
611 | ||
612 | void __exit dn_neigh_cleanup(void) | |
613 | { | |
ece31ffd | 614 | remove_proc_entry("decnet_neigh", init_net.proc_net); |
d7480fd3 | 615 | neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table); |
1da177e4 | 616 | } |