Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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 | * | |
429eb0fa | 7 | * DECnet Neighbour Functions (Adjacency Database and |
1da177e4 LT |
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 | ||
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/module.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/if_arp.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
60063497 | 42 | #include <linux/atomic.h> |
457c4cbc | 43 | #include <net/net_namespace.h> |
1da177e4 LT |
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 | ||
1da177e4 | 52 | static int dn_neigh_construct(struct neighbour *); |
aaa4e704 EB |
53 | static void dn_neigh_error_report(struct neighbour *, struct sk_buff *); |
54 | static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb); | |
1da177e4 LT |
55 | |
56 | /* | |
aaa4e704 | 57 | * Operations for adding the link layer header. |
1da177e4 | 58 | */ |
aaa4e704 | 59 | static const struct neigh_ops dn_neigh_ops = { |
1da177e4 | 60 | .family = AF_DECnet, |
aaa4e704 EB |
61 | .error_report = dn_neigh_error_report, |
62 | .output = dn_neigh_output, | |
63 | .connected_output = dn_neigh_output, | |
1da177e4 LT |
64 | }; |
65 | ||
d6bf7817 ED |
66 | static u32 dn_neigh_hash(const void *pkey, |
67 | const struct net_device *dev, | |
2c2aba6c | 68 | __u32 *hash_rnd) |
d6bf7817 | 69 | { |
2c2aba6c | 70 | return jhash_2words(*(__u16 *)pkey, 0, hash_rnd[0]); |
d6bf7817 ED |
71 | } |
72 | ||
60395a20 EB |
73 | static bool dn_key_eq(const struct neighbour *neigh, const void *pkey) |
74 | { | |
75 | return neigh_key_eq16(neigh, pkey); | |
76 | } | |
77 | ||
1da177e4 LT |
78 | struct neigh_table dn_neigh_table = { |
79 | .family = PF_DECnet, | |
daaba4fa | 80 | .entry_size = NEIGH_ENTRY_SIZE(sizeof(struct dn_neigh)), |
c4ea94ab | 81 | .key_len = sizeof(__le16), |
bdf53c58 | 82 | .protocol = cpu_to_be16(ETH_P_DNA_RT), |
1da177e4 | 83 | .hash = dn_neigh_hash, |
60395a20 | 84 | .key_eq = dn_key_eq, |
1da177e4 LT |
85 | .constructor = dn_neigh_construct, |
86 | .id = "dn_neigh_cache", | |
87 | .parms ={ | |
88 | .tbl = &dn_neigh_table, | |
1f9248e5 JP |
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, | |
eaa72dc4 | 98 | [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX, |
1f9248e5 JP |
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 | }, | |
1da177e4 LT |
104 | }, |
105 | .gc_interval = 30 * HZ, | |
106 | .gc_thresh1 = 128, | |
107 | .gc_thresh2 = 512, | |
108 | .gc_thresh3 = 1024, | |
109 | }; | |
110 | ||
1da177e4 LT |
111 | static int dn_neigh_construct(struct neighbour *neigh) |
112 | { | |
113 | struct net_device *dev = neigh->dev; | |
f92ceb01 | 114 | struct dn_neigh *dn = container_of(neigh, struct dn_neigh, n); |
1da177e4 LT |
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); | |
1f07247d | 133 | rcu_read_unlock(); |
1da177e4 | 134 | |
aaa4e704 | 135 | neigh->ops = &dn_neigh_ops; |
1da177e4 LT |
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 { | |
e87cc472 JP |
144 | net_dbg_ratelimited("Trying to create neigh for hw %d\n", |
145 | dev->type); | |
1da177e4 LT |
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 | ||
aaa4e704 | 167 | static void dn_neigh_error_report(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 168 | { |
aaa4e704 | 169 | printk(KERN_DEBUG "dn_neigh_error_report: called\n"); |
1da177e4 LT |
170 | kfree_skb(skb); |
171 | } | |
172 | ||
aaa4e704 | 173 | static int dn_neigh_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 174 | { |
adf30907 | 175 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 | 176 | struct dn_route *rt = (struct dn_route *)dst; |
1da177e4 LT |
177 | struct net_device *dev = neigh->dev; |
178 | char mac_addr[ETH_ALEN]; | |
3329bdfc DM |
179 | unsigned int seq; |
180 | int err; | |
1da177e4 LT |
181 | |
182 | dn_dn2eth(mac_addr, rt->rt_local_src); | |
3329bdfc DM |
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; | |
1da177e4 LT |
196 | } |
197 | ||
0c4b51f0 | 198 | static int dn_neigh_output_packet(struct net *net, struct sock *sk, struct sk_buff *skb) |
aaa4e704 EB |
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 | */ | |
7026b1dd DM |
210 | static int dn_long_output(struct neighbour *neigh, struct sock *sk, |
211 | struct sk_buff *skb) | |
1da177e4 | 212 | { |
1da177e4 LT |
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) { | |
e87cc472 | 223 | net_crit_ratelimited("dn_long_output: no memory\n"); |
1da177e4 LT |
224 | kfree_skb(skb); |
225 | return -ENOBUFS; | |
226 | } | |
5d0ba55b | 227 | consume_skb(skb); |
1da177e4 | 228 | skb = skb2; |
e87cc472 | 229 | net_info_ratelimited("dn_long_output: Increasing headroom\n"); |
1da177e4 LT |
230 | } |
231 | ||
232 | data = skb_push(skb, sizeof(struct dn_long_packet) + 3); | |
233 | lp = (struct dn_long_packet *)(data+3); | |
234 | ||
c4106aa8 | 235 | *((__le16 *)data) = cpu_to_le16(skb->len - 2); |
1da177e4 LT |
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; | |
c4ea94ab | 240 | dn_dn2eth(lp->d_id, cb->dst); |
1da177e4 | 241 | lp->s_area = lp->s_subarea = 0; |
c4ea94ab | 242 | dn_dn2eth(lp->s_id, cb->src); |
1da177e4 LT |
243 | lp->nl2 = 0; |
244 | lp->visit_ct = cb->hops & 0x3f; | |
245 | lp->s_class = 0; | |
246 | lp->pt = 0; | |
247 | ||
c1d2bbe1 | 248 | skb_reset_network_header(skb); |
1da177e4 | 249 | |
29a26a56 EB |
250 | return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, |
251 | &init_net, sk, skb, NULL, neigh->dev, | |
252 | dn_neigh_output_packet); | |
1da177e4 LT |
253 | } |
254 | ||
aaa4e704 EB |
255 | /* |
256 | * For talking to pointopoint and multidrop devices: DDCMP and X.25 | |
257 | */ | |
7026b1dd DM |
258 | static int dn_short_output(struct neighbour *neigh, struct sock *sk, |
259 | struct sk_buff *skb) | |
1da177e4 | 260 | { |
1da177e4 LT |
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 | ||
429eb0fa YH |
268 | if (skb_headroom(skb) < headroom) { |
269 | struct sk_buff *skb2 = skb_realloc_headroom(skb, headroom); | |
270 | if (skb2 == NULL) { | |
e87cc472 | 271 | net_crit_ratelimited("dn_short_output: no memory\n"); |
429eb0fa YH |
272 | kfree_skb(skb); |
273 | return -ENOBUFS; | |
274 | } | |
5d0ba55b | 275 | consume_skb(skb); |
429eb0fa | 276 | skb = skb2; |
e87cc472 | 277 | net_info_ratelimited("dn_short_output: Increasing headroom\n"); |
429eb0fa | 278 | } |
1da177e4 LT |
279 | |
280 | data = skb_push(skb, sizeof(struct dn_short_packet) + 2); | |
c4106aa8 | 281 | *((__le16 *)data) = cpu_to_le16(skb->len - 2); |
1da177e4 LT |
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 | ||
c1d2bbe1 | 289 | skb_reset_network_header(skb); |
1da177e4 | 290 | |
29a26a56 EB |
291 | return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, |
292 | &init_net, sk, skb, NULL, neigh->dev, | |
293 | dn_neigh_output_packet); | |
1da177e4 LT |
294 | } |
295 | ||
296 | /* | |
aaa4e704 EB |
297 | * For talking to DECnet phase III nodes |
298 | * Phase 3 output is the same as short output, execpt that | |
1da177e4 LT |
299 | * it clears the area bits before transmission. |
300 | */ | |
7026b1dd DM |
301 | static int dn_phase3_output(struct neighbour *neigh, struct sock *sk, |
302 | struct sk_buff *skb) | |
1da177e4 | 303 | { |
1da177e4 LT |
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) { | |
e87cc472 | 313 | net_crit_ratelimited("dn_phase3_output: no memory\n"); |
1da177e4 LT |
314 | kfree_skb(skb); |
315 | return -ENOBUFS; | |
316 | } | |
5d0ba55b | 317 | consume_skb(skb); |
1da177e4 | 318 | skb = skb2; |
e87cc472 | 319 | net_info_ratelimited("dn_phase3_output: Increasing headroom\n"); |
1da177e4 LT |
320 | } |
321 | ||
322 | data = skb_push(skb, sizeof(struct dn_short_packet) + 2); | |
c4106aa8 | 323 | *((__le16 *)data) = cpu_to_le16(skb->len - 2); |
1da177e4 LT |
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)); | |
c4106aa8 HH |
327 | sp->dstnode = cb->dst & cpu_to_le16(0x03ff); |
328 | sp->srcnode = cb->src & cpu_to_le16(0x03ff); | |
1da177e4 LT |
329 | sp->forward = cb->hops & 0x3f; |
330 | ||
c1d2bbe1 | 331 | skb_reset_network_header(skb); |
1da177e4 | 332 | |
29a26a56 EB |
333 | return NF_HOOK(NFPROTO_DECNET, NF_DN_POST_ROUTING, |
334 | &init_net, sk, skb, NULL, neigh->dev, | |
335 | dn_neigh_output_packet); | |
1da177e4 LT |
336 | } |
337 | ||
0c4b51f0 | 338 | int dn_to_neigh_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
aaa4e704 EB |
339 | { |
340 | struct dst_entry *dst = skb_dst(skb); | |
341 | struct dn_route *rt = (struct dn_route *) dst; | |
342 | struct neighbour *neigh = rt->n; | |
f92ceb01 | 343 | struct dn_neigh *dn = container_of(neigh, struct dn_neigh, n); |
aaa4e704 EB |
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) | |
7026b1dd | 357 | return dn_phase3_output(neigh, sk, skb); |
aaa4e704 | 358 | if (use_long) |
7026b1dd | 359 | return dn_long_output(neigh, sk, skb); |
aaa4e704 | 360 | else |
7026b1dd | 361 | return dn_short_output(neigh, sk, skb); |
aaa4e704 EB |
362 | } |
363 | ||
1da177e4 LT |
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 | */ | |
374 | void dn_neigh_pointopoint_hello(struct sk_buff *skb) | |
375 | { | |
376 | kfree_skb(skb); | |
377 | } | |
378 | ||
379 | /* | |
380 | * Ethernet router hello message received | |
381 | */ | |
0c4b51f0 | 382 | int dn_neigh_router_hello(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
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; | |
c4ea94ab | 389 | __le16 src; |
1da177e4 | 390 | |
c4ea94ab | 391 | src = dn_eth2dn(msg->id); |
1da177e4 LT |
392 | |
393 | neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); | |
394 | ||
f92ceb01 | 395 | dn = container_of(neigh, struct dn_neigh, n); |
1da177e4 LT |
396 | |
397 | if (neigh) { | |
398 | write_lock(&neigh->lock); | |
399 | ||
400 | neigh->used = jiffies; | |
fc766e4c | 401 | dn_db = rcu_dereference(neigh->dev->dn_ptr); |
1da177e4 LT |
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 | ||
c4106aa8 | 409 | dn->blksize = le16_to_cpu(msg->blksize); |
1da177e4 LT |
410 | dn->priority = msg->priority; |
411 | ||
412 | dn->flags &= ~DN_NDFLAG_P3; | |
413 | ||
06f8fe11 JP |
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; | |
1da177e4 LT |
421 | } |
422 | } | |
423 | ||
5062430c | 424 | /* Only use routers in our area */ |
c4106aa8 | 425 | if ((le16_to_cpu(src)>>10) == (le16_to_cpu((decnet_address))>>10)) { |
5062430c PC |
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 | } | |
1da177e4 LT |
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 | */ | |
0c4b51f0 | 444 | int dn_neigh_endnode_hello(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
445 | { |
446 | struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data; | |
447 | struct neighbour *neigh; | |
448 | struct dn_neigh *dn; | |
c4ea94ab | 449 | __le16 src; |
1da177e4 | 450 | |
c4ea94ab | 451 | src = dn_eth2dn(msg->id); |
1da177e4 LT |
452 | |
453 | neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); | |
454 | ||
f92ceb01 | 455 | dn = container_of(neigh, struct dn_neigh, n); |
1da177e4 LT |
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); | |
c4106aa8 | 468 | dn->blksize = le16_to_cpu(msg->blksize); |
1da177e4 LT |
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 | ||
480 | static 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 | ||
499 | struct elist_cb_state { | |
500 | struct net_device *dev; | |
501 | unsigned char *ptr; | |
502 | unsigned char *rs; | |
503 | int t, n; | |
504 | }; | |
505 | ||
506 | static void neigh_elist_cb(struct neighbour *neigh, void *_info) | |
507 | { | |
508 | struct elist_cb_state *s = _info; | |
1da177e4 LT |
509 | struct dn_neigh *dn; |
510 | ||
511 | if (neigh->dev != s->dev) | |
512 | return; | |
513 | ||
f92ceb01 | 514 | dn = container_of(neigh, struct dn_neigh, n); |
1da177e4 LT |
515 | if (!(dn->flags & (DN_NDFLAG_R1|DN_NDFLAG_R2))) |
516 | return; | |
517 | ||
1da177e4 LT |
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 | ||
532 | int 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 | ||
550 | static inline void dn_neigh_format_entry(struct seq_file *seq, | |
551 | struct neighbour *n) | |
552 | { | |
f92ceb01 | 553 | struct dn_neigh *dn = container_of(n, struct dn_neigh, n); |
1da177e4 LT |
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", | |
c4106aa8 | 558 | dn_addr2asc(le16_to_cpu(dn->addr), buf), |
1da177e4 LT |
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, | |
9f237430 | 563 | refcount_read(&dn->n.refcnt), |
1da177e4 LT |
564 | dn->blksize, |
565 | (dn->n.dev) ? dn->n.dev->name : "?"); | |
566 | read_unlock(&n->lock); | |
567 | } | |
568 | ||
569 | static 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 | ||
580 | static 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 | ||
56b3d975 | 586 | static const struct seq_operations dn_neigh_seq_ops = { |
1da177e4 LT |
587 | .start = dn_neigh_seq_start, |
588 | .next = neigh_seq_next, | |
589 | .stop = neigh_seq_stop, | |
590 | .show = dn_neigh_seq_show, | |
591 | }; | |
592 | ||
593 | static int dn_neigh_seq_open(struct inode *inode, struct file *file) | |
594 | { | |
426b5303 EB |
595 | return seq_open_net(inode, file, &dn_neigh_seq_ops, |
596 | sizeof(struct neigh_seq_state)); | |
1da177e4 LT |
597 | } |
598 | ||
9a32144e | 599 | static const struct file_operations dn_neigh_seq_fops = { |
1da177e4 LT |
600 | .owner = THIS_MODULE, |
601 | .open = dn_neigh_seq_open, | |
602 | .read = seq_read, | |
603 | .llseek = seq_lseek, | |
426b5303 | 604 | .release = seq_release_net, |
1da177e4 LT |
605 | }; |
606 | ||
607 | #endif | |
608 | ||
609 | void __init dn_neigh_init(void) | |
610 | { | |
d7480fd3 | 611 | neigh_table_init(NEIGH_DN_TABLE, &dn_neigh_table); |
d4beaa66 G |
612 | proc_create("decnet_neigh", S_IRUGO, init_net.proc_net, |
613 | &dn_neigh_seq_fops); | |
1da177e4 LT |
614 | } |
615 | ||
616 | void __exit dn_neigh_cleanup(void) | |
617 | { | |
ece31ffd | 618 | remove_proc_entry("decnet_neigh", init_net.proc_net); |
d7480fd3 | 619 | neigh_table_clear(NEIGH_DN_TABLE, &dn_neigh_table); |
1da177e4 | 620 | } |