Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f30c2269 | 2 | /* linux/net/ipv4/arp.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 1994 by Florian La Roche | |
5 | * | |
6 | * This module implements the Address Resolution Protocol ARP (RFC 826), | |
7 | * which is used to convert IP addresses (or in the future maybe other | |
8 | * high-level addresses) into a low-level hardware address (like an Ethernet | |
9 | * address). | |
10 | * | |
1da177e4 | 11 | * Fixes: |
e905a9ed | 12 | * Alan Cox : Removed the Ethernet assumptions in |
1da177e4 | 13 | * Florian's code |
e905a9ed | 14 | * Alan Cox : Fixed some small errors in the ARP |
1da177e4 LT |
15 | * logic |
16 | * Alan Cox : Allow >4K in /proc | |
17 | * Alan Cox : Make ARP add its own protocol entry | |
18 | * Ross Martin : Rewrote arp_rcv() and arp_get_info() | |
19 | * Stephen Henson : Add AX25 support to arp_get_info() | |
20 | * Alan Cox : Drop data when a device is downed. | |
21 | * Alan Cox : Use init_timer(). | |
22 | * Alan Cox : Double lock fixes. | |
23 | * Martin Seine : Move the arphdr structure | |
24 | * to if_arp.h for compatibility. | |
25 | * with BSD based programs. | |
26 | * Andrew Tridgell : Added ARP netmask code and | |
27 | * re-arranged proxy handling. | |
28 | * Alan Cox : Changed to use notifiers. | |
29 | * Niibe Yutaka : Reply for this device or proxies only. | |
30 | * Alan Cox : Don't proxy across hardware types! | |
31 | * Jonathan Naylor : Added support for NET/ROM. | |
32 | * Mike Shaver : RFC1122 checks. | |
33 | * Jonathan Naylor : Only lookup the hardware address for | |
34 | * the correct hardware type. | |
35 | * Germano Caronni : Assorted subtle races. | |
e905a9ed | 36 | * Craig Schlenter : Don't modify permanent entry |
1da177e4 LT |
37 | * during arp_rcv. |
38 | * Russ Nelson : Tidied up a few bits. | |
39 | * Alexey Kuznetsov: Major changes to caching and behaviour, | |
e905a9ed | 40 | * eg intelligent arp probing and |
1da177e4 LT |
41 | * generation |
42 | * of host down events. | |
43 | * Alan Cox : Missing unlock in device events. | |
44 | * Eckes : ARP ioctl control errors. | |
45 | * Alexey Kuznetsov: Arp free fix. | |
46 | * Manuel Rodriguez: Gratuitous ARP. | |
e905a9ed | 47 | * Jonathan Layes : Added arpd support through kerneld |
1da177e4 LT |
48 | * message queue (960314) |
49 | * Mike Shaver : /proc/sys/net/ipv4/arp_* support | |
50 | * Mike McLagan : Routing by source | |
51 | * Stuart Cheshire : Metricom and grat arp fixes | |
52 | * *** FOR 2.1 clean this up *** | |
53 | * Lawrence V. Stefani: (08/12/96) Added FDDI support. | |
deffd777 | 54 | * Alan Cox : Took the AP1000 nasty FDDI hack and |
1da177e4 LT |
55 | * folded into the mainstream FDDI code. |
56 | * Ack spit, Linus how did you allow that | |
57 | * one in... | |
58 | * Jes Sorensen : Make FDDI work again in 2.1.x and | |
59 | * clean up the APFDDI & gen. FDDI bits. | |
60 | * Alexey Kuznetsov: new arp state machine; | |
61 | * now it is in net/core/neighbour.c. | |
62 | * Krzysztof Halasa: Added Frame Relay ARP support. | |
63 | * Arnaldo C. Melo : convert /proc/net/arp to seq_file | |
64 | * Shmulik Hen: Split arp_send to arp_create and | |
65 | * arp_xmit so intermediate drivers like | |
66 | * bonding can change the skb before | |
67 | * sending (e.g. insert 8021q tag). | |
68 | * Harald Welte : convert to make use of jenkins hash | |
65324144 | 69 | * Jesper D. Brouer: Proxy ARP PVLAN RFC 3069 support. |
1da177e4 LT |
70 | */ |
71 | ||
91df42be JP |
72 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
73 | ||
1da177e4 LT |
74 | #include <linux/module.h> |
75 | #include <linux/types.h> | |
76 | #include <linux/string.h> | |
77 | #include <linux/kernel.h> | |
4fc268d2 | 78 | #include <linux/capability.h> |
1da177e4 LT |
79 | #include <linux/socket.h> |
80 | #include <linux/sockios.h> | |
81 | #include <linux/errno.h> | |
82 | #include <linux/in.h> | |
83 | #include <linux/mm.h> | |
84 | #include <linux/inet.h> | |
14c85021 | 85 | #include <linux/inetdevice.h> |
1da177e4 LT |
86 | #include <linux/netdevice.h> |
87 | #include <linux/etherdevice.h> | |
88 | #include <linux/fddidevice.h> | |
89 | #include <linux/if_arp.h> | |
1da177e4 LT |
90 | #include <linux/skbuff.h> |
91 | #include <linux/proc_fs.h> | |
92 | #include <linux/seq_file.h> | |
93 | #include <linux/stat.h> | |
94 | #include <linux/init.h> | |
95 | #include <linux/net.h> | |
96 | #include <linux/rcupdate.h> | |
5a0e3ad6 | 97 | #include <linux/slab.h> |
1da177e4 LT |
98 | #ifdef CONFIG_SYSCTL |
99 | #include <linux/sysctl.h> | |
100 | #endif | |
101 | ||
457c4cbc | 102 | #include <net/net_namespace.h> |
1da177e4 LT |
103 | #include <net/ip.h> |
104 | #include <net/icmp.h> | |
105 | #include <net/route.h> | |
106 | #include <net/protocol.h> | |
107 | #include <net/tcp.h> | |
108 | #include <net/sock.h> | |
109 | #include <net/arp.h> | |
1da177e4 | 110 | #include <net/ax25.h> |
1da177e4 | 111 | #include <net/netrom.h> |
63d008a4 JB |
112 | #include <net/dst_metadata.h> |
113 | #include <net/ip_tunnels.h> | |
1da177e4 | 114 | |
deffd777 | 115 | #include <linux/uaccess.h> |
1da177e4 LT |
116 | |
117 | #include <linux/netfilter_arp.h> | |
118 | ||
119 | /* | |
120 | * Interface to generic neighbour cache. | |
121 | */ | |
2c2aba6c | 122 | static u32 arp_hash(const void *pkey, const struct net_device *dev, __u32 *hash_rnd); |
60395a20 | 123 | static bool arp_key_eq(const struct neighbour *n, const void *pkey); |
1da177e4 LT |
124 | static int arp_constructor(struct neighbour *neigh); |
125 | static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
126 | static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
127 | static void parp_redo(struct sk_buff *skb); | |
128 | ||
89d69d2b | 129 | static const struct neigh_ops arp_generic_ops = { |
1da177e4 LT |
130 | .family = AF_INET, |
131 | .solicit = arp_solicit, | |
132 | .error_report = arp_error_report, | |
133 | .output = neigh_resolve_output, | |
134 | .connected_output = neigh_connected_output, | |
1da177e4 LT |
135 | }; |
136 | ||
89d69d2b | 137 | static const struct neigh_ops arp_hh_ops = { |
1da177e4 LT |
138 | .family = AF_INET, |
139 | .solicit = arp_solicit, | |
140 | .error_report = arp_error_report, | |
141 | .output = neigh_resolve_output, | |
142 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
143 | }; |
144 | ||
89d69d2b | 145 | static const struct neigh_ops arp_direct_ops = { |
1da177e4 | 146 | .family = AF_INET, |
8f40b161 DM |
147 | .output = neigh_direct_output, |
148 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
149 | }; |
150 | ||
1da177e4 | 151 | struct neigh_table arp_tbl = { |
deffd777 | 152 | .family = AF_INET, |
deffd777 | 153 | .key_len = 4, |
bdf53c58 | 154 | .protocol = cpu_to_be16(ETH_P_IP), |
deffd777 | 155 | .hash = arp_hash, |
60395a20 | 156 | .key_eq = arp_key_eq, |
deffd777 CG |
157 | .constructor = arp_constructor, |
158 | .proxy_redo = parp_redo, | |
159 | .id = "arp_cache", | |
160 | .parms = { | |
161 | .tbl = &arp_tbl, | |
deffd777 | 162 | .reachable_time = 30 * HZ, |
1f9248e5 JP |
163 | .data = { |
164 | [NEIGH_VAR_MCAST_PROBES] = 3, | |
165 | [NEIGH_VAR_UCAST_PROBES] = 3, | |
166 | [NEIGH_VAR_RETRANS_TIME] = 1 * HZ, | |
167 | [NEIGH_VAR_BASE_REACHABLE_TIME] = 30 * HZ, | |
168 | [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, | |
169 | [NEIGH_VAR_GC_STALETIME] = 60 * HZ, | |
eaa72dc4 | 170 | [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX, |
1f9248e5 JP |
171 | [NEIGH_VAR_PROXY_QLEN] = 64, |
172 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, | |
173 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, | |
174 | [NEIGH_VAR_LOCKTIME] = 1 * HZ, | |
175 | }, | |
1da177e4 | 176 | }, |
deffd777 CG |
177 | .gc_interval = 30 * HZ, |
178 | .gc_thresh1 = 128, | |
179 | .gc_thresh2 = 512, | |
180 | .gc_thresh3 = 1024, | |
1da177e4 | 181 | }; |
4bc2f18b | 182 | EXPORT_SYMBOL(arp_tbl); |
1da177e4 | 183 | |
714e85be | 184 | int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir) |
1da177e4 LT |
185 | { |
186 | switch (dev->type) { | |
187 | case ARPHRD_ETHER: | |
188 | case ARPHRD_FDDI: | |
189 | case ARPHRD_IEEE802: | |
190 | ip_eth_mc_map(addr, haddr); | |
e905a9ed | 191 | return 0; |
1da177e4 | 192 | case ARPHRD_INFINIBAND: |
a9e527e3 | 193 | ip_ib_mc_map(addr, dev->broadcast, haddr); |
1da177e4 | 194 | return 0; |
93ca3bb5 TT |
195 | case ARPHRD_IPGRE: |
196 | ip_ipgre_mc_map(addr, dev->broadcast, haddr); | |
197 | return 0; | |
1da177e4 LT |
198 | default: |
199 | if (dir) { | |
200 | memcpy(haddr, dev->broadcast, dev->addr_len); | |
201 | return 0; | |
202 | } | |
203 | } | |
204 | return -EINVAL; | |
205 | } | |
206 | ||
207 | ||
d6bf7817 ED |
208 | static u32 arp_hash(const void *pkey, |
209 | const struct net_device *dev, | |
2c2aba6c | 210 | __u32 *hash_rnd) |
1da177e4 | 211 | { |
60395a20 EB |
212 | return arp_hashfn(pkey, dev, hash_rnd); |
213 | } | |
214 | ||
215 | static bool arp_key_eq(const struct neighbour *neigh, const void *pkey) | |
216 | { | |
217 | return neigh_key_eq32(neigh, pkey); | |
1da177e4 LT |
218 | } |
219 | ||
220 | static int arp_constructor(struct neighbour *neigh) | |
221 | { | |
cd9ff4de | 222 | __be32 addr; |
1da177e4 LT |
223 | struct net_device *dev = neigh->dev; |
224 | struct in_device *in_dev; | |
225 | struct neigh_parms *parms; | |
cd9ff4de | 226 | u32 inaddr_any = INADDR_ANY; |
1da177e4 | 227 | |
cd9ff4de JW |
228 | if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) |
229 | memcpy(neigh->primary_key, &inaddr_any, arp_tbl.key_len); | |
230 | ||
231 | addr = *(__be32 *)neigh->primary_key; | |
1da177e4 | 232 | rcu_read_lock(); |
e5ed6399 | 233 | in_dev = __in_dev_get_rcu(dev); |
51456b29 | 234 | if (!in_dev) { |
1da177e4 LT |
235 | rcu_read_unlock(); |
236 | return -EINVAL; | |
237 | } | |
238 | ||
30bbaa19 | 239 | neigh->type = inet_addr_type_dev_table(dev_net(dev), dev, addr); |
a79878f0 | 240 | |
1da177e4 LT |
241 | parms = in_dev->arp_parms; |
242 | __neigh_parms_put(neigh->parms); | |
243 | neigh->parms = neigh_parms_clone(parms); | |
244 | rcu_read_unlock(); | |
245 | ||
3b04ddde | 246 | if (!dev->header_ops) { |
1da177e4 LT |
247 | neigh->nud_state = NUD_NOARP; |
248 | neigh->ops = &arp_direct_ops; | |
8f40b161 | 249 | neigh->output = neigh_direct_output; |
1da177e4 LT |
250 | } else { |
251 | /* Good devices (checked by reading texts, but only Ethernet is | |
252 | tested) | |
253 | ||
254 | ARPHRD_ETHER: (ethernet, apfddi) | |
255 | ARPHRD_FDDI: (fddi) | |
256 | ARPHRD_IEEE802: (tr) | |
257 | ARPHRD_METRICOM: (strip) | |
258 | ARPHRD_ARCNET: | |
259 | etc. etc. etc. | |
260 | ||
261 | ARPHRD_IPDDP will also work, if author repairs it. | |
262 | I did not it, because this driver does not work even | |
263 | in old paradigm. | |
264 | */ | |
265 | ||
1da177e4 LT |
266 | if (neigh->type == RTN_MULTICAST) { |
267 | neigh->nud_state = NUD_NOARP; | |
268 | arp_mc_map(addr, neigh->ha, dev, 1); | |
deffd777 | 269 | } else if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) { |
1da177e4 LT |
270 | neigh->nud_state = NUD_NOARP; |
271 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
deffd777 CG |
272 | } else if (neigh->type == RTN_BROADCAST || |
273 | (dev->flags & IFF_POINTOPOINT)) { | |
1da177e4 LT |
274 | neigh->nud_state = NUD_NOARP; |
275 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
276 | } | |
3b04ddde SH |
277 | |
278 | if (dev->header_ops->cache) | |
1da177e4 LT |
279 | neigh->ops = &arp_hh_ops; |
280 | else | |
281 | neigh->ops = &arp_generic_ops; | |
3b04ddde | 282 | |
deffd777 | 283 | if (neigh->nud_state & NUD_VALID) |
1da177e4 LT |
284 | neigh->output = neigh->ops->connected_output; |
285 | else | |
286 | neigh->output = neigh->ops->output; | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
292 | { | |
293 | dst_link_failure(skb); | |
294 | kfree_skb(skb); | |
295 | } | |
296 | ||
0accfc26 TG |
297 | /* Create and send an arp packet. */ |
298 | static void arp_send_dst(int type, int ptype, __be32 dest_ip, | |
299 | struct net_device *dev, __be32 src_ip, | |
300 | const unsigned char *dest_hw, | |
301 | const unsigned char *src_hw, | |
63d008a4 JB |
302 | const unsigned char *target_hw, |
303 | struct dst_entry *dst) | |
0accfc26 TG |
304 | { |
305 | struct sk_buff *skb; | |
306 | ||
307 | /* arp on this interface. */ | |
308 | if (dev->flags & IFF_NOARP) | |
309 | return; | |
310 | ||
311 | skb = arp_create(type, ptype, dest_ip, dev, src_ip, | |
312 | dest_hw, src_hw, target_hw); | |
313 | if (!skb) | |
314 | return; | |
315 | ||
181a4224 | 316 | skb_dst_set(skb, dst_clone(dst)); |
0accfc26 TG |
317 | arp_xmit(skb); |
318 | } | |
319 | ||
320 | void arp_send(int type, int ptype, __be32 dest_ip, | |
321 | struct net_device *dev, __be32 src_ip, | |
322 | const unsigned char *dest_hw, const unsigned char *src_hw, | |
323 | const unsigned char *target_hw) | |
324 | { | |
325 | arp_send_dst(type, ptype, dest_ip, dev, src_ip, dest_hw, src_hw, | |
326 | target_hw, NULL); | |
327 | } | |
328 | EXPORT_SYMBOL(arp_send); | |
329 | ||
1da177e4 LT |
330 | static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) |
331 | { | |
a61ced5d | 332 | __be32 saddr = 0; |
cf0be880 | 333 | u8 dst_ha[MAX_ADDR_LEN], *dst_hw = NULL; |
1da177e4 | 334 | struct net_device *dev = neigh->dev; |
deffd777 | 335 | __be32 target = *(__be32 *)neigh->primary_key; |
1da177e4 | 336 | int probes = atomic_read(&neigh->probes); |
4b4194c4 | 337 | struct in_device *in_dev; |
63d008a4 | 338 | struct dst_entry *dst = NULL; |
1da177e4 | 339 | |
4b4194c4 ED |
340 | rcu_read_lock(); |
341 | in_dev = __in_dev_get_rcu(dev); | |
342 | if (!in_dev) { | |
343 | rcu_read_unlock(); | |
1da177e4 | 344 | return; |
4b4194c4 | 345 | } |
1da177e4 LT |
346 | switch (IN_DEV_ARP_ANNOUNCE(in_dev)) { |
347 | default: | |
348 | case 0: /* By default announce any local IP */ | |
30bbaa19 | 349 | if (skb && inet_addr_type_dev_table(dev_net(dev), dev, |
deffd777 | 350 | ip_hdr(skb)->saddr) == RTN_LOCAL) |
eddc9ec5 | 351 | saddr = ip_hdr(skb)->saddr; |
1da177e4 LT |
352 | break; |
353 | case 1: /* Restrict announcements of saddr in same subnet */ | |
354 | if (!skb) | |
355 | break; | |
eddc9ec5 | 356 | saddr = ip_hdr(skb)->saddr; |
30bbaa19 DA |
357 | if (inet_addr_type_dev_table(dev_net(dev), dev, |
358 | saddr) == RTN_LOCAL) { | |
1da177e4 LT |
359 | /* saddr should be known to target */ |
360 | if (inet_addr_onlink(in_dev, target, saddr)) | |
361 | break; | |
362 | } | |
363 | saddr = 0; | |
364 | break; | |
365 | case 2: /* Avoid secondary IPs, get a primary/preferred one */ | |
366 | break; | |
367 | } | |
4b4194c4 | 368 | rcu_read_unlock(); |
1da177e4 | 369 | |
1da177e4 LT |
370 | if (!saddr) |
371 | saddr = inet_select_addr(dev, target, RT_SCOPE_LINK); | |
372 | ||
1f9248e5 | 373 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
deffd777 CG |
374 | if (probes < 0) { |
375 | if (!(neigh->nud_state & NUD_VALID)) | |
91df42be | 376 | pr_debug("trying to ucast probe in NUD_INVALID\n"); |
9650388b | 377 | neigh_ha_snapshot(dst_ha, neigh, dev); |
cf0be880 | 378 | dst_hw = dst_ha; |
deffd777 | 379 | } else { |
1f9248e5 | 380 | probes -= NEIGH_VAR(neigh->parms, APP_PROBES); |
deffd777 | 381 | if (probes < 0) { |
deffd777 | 382 | neigh_app_ns(neigh); |
deffd777 CG |
383 | return; |
384 | } | |
1da177e4 LT |
385 | } |
386 | ||
63d008a4 | 387 | if (skb && !(dev->priv_flags & IFF_XMIT_DST_RELEASE)) |
181a4224 | 388 | dst = skb_dst(skb); |
0accfc26 | 389 | arp_send_dst(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr, |
63d008a4 | 390 | dst_hw, dev->dev_addr, NULL, dst); |
1da177e4 LT |
391 | } |
392 | ||
9bd85e32 | 393 | static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip) |
1da177e4 | 394 | { |
b601fa19 | 395 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
396 | int scope; |
397 | ||
398 | switch (IN_DEV_ARP_IGNORE(in_dev)) { | |
399 | case 0: /* Reply, the tip is already validated */ | |
400 | return 0; | |
401 | case 1: /* Reply only if tip is configured on the incoming interface */ | |
402 | sip = 0; | |
403 | scope = RT_SCOPE_HOST; | |
404 | break; | |
405 | case 2: /* | |
406 | * Reply only if tip is configured on the incoming interface | |
407 | * and is in same subnet as sip | |
408 | */ | |
409 | scope = RT_SCOPE_HOST; | |
410 | break; | |
411 | case 3: /* Do not reply for scope host addresses */ | |
412 | sip = 0; | |
413 | scope = RT_SCOPE_LINK; | |
b601fa19 | 414 | in_dev = NULL; |
1da177e4 LT |
415 | break; |
416 | case 4: /* Reserved */ | |
417 | case 5: | |
418 | case 6: | |
419 | case 7: | |
420 | return 0; | |
421 | case 8: /* Do not reply */ | |
422 | return 1; | |
423 | default: | |
424 | return 0; | |
425 | } | |
b601fa19 | 426 | return !inet_confirm_addr(net, in_dev, sip, tip, scope); |
1da177e4 LT |
427 | } |
428 | ||
ed9bad06 | 429 | static int arp_filter(__be32 sip, __be32 tip, struct net_device *dev) |
1da177e4 | 430 | { |
1da177e4 | 431 | struct rtable *rt; |
e905a9ed | 432 | int flag = 0; |
1da177e4 | 433 | /*unsigned long now; */ |
ca12a1a4 | 434 | struct net *net = dev_net(dev); |
1da177e4 | 435 | |
58b35f27 | 436 | rt = ip_route_output(net, sip, tip, 0, l3mdev_master_ifindex_rcu(dev)); |
b23dd4fe | 437 | if (IS_ERR(rt)) |
1da177e4 | 438 | return 1; |
d8d1f30b | 439 | if (rt->dst.dev != dev) { |
02a1d6e7 | 440 | __NET_INC_STATS(net, LINUX_MIB_ARPFILTER); |
1da177e4 | 441 | flag = 1; |
e905a9ed YH |
442 | } |
443 | ip_rt_put(rt); | |
444 | return flag; | |
445 | } | |
1da177e4 | 446 | |
1da177e4 LT |
447 | /* |
448 | * Check if we can use proxy ARP for this path | |
449 | */ | |
65324144 JDB |
450 | static inline int arp_fwd_proxy(struct in_device *in_dev, |
451 | struct net_device *dev, struct rtable *rt) | |
1da177e4 LT |
452 | { |
453 | struct in_device *out_dev; | |
454 | int imi, omi = -1; | |
455 | ||
d8d1f30b | 456 | if (rt->dst.dev == dev) |
65324144 JDB |
457 | return 0; |
458 | ||
1da177e4 LT |
459 | if (!IN_DEV_PROXY_ARP(in_dev)) |
460 | return 0; | |
deffd777 CG |
461 | imi = IN_DEV_MEDIUM_ID(in_dev); |
462 | if (imi == 0) | |
1da177e4 LT |
463 | return 1; |
464 | if (imi == -1) | |
465 | return 0; | |
466 | ||
467 | /* place to check for proxy_arp for routes */ | |
468 | ||
d8d1f30b | 469 | out_dev = __in_dev_get_rcu(rt->dst.dev); |
faa9dcf7 | 470 | if (out_dev) |
1da177e4 | 471 | omi = IN_DEV_MEDIUM_ID(out_dev); |
faa9dcf7 | 472 | |
a02cec21 | 473 | return omi != imi && omi != -1; |
1da177e4 LT |
474 | } |
475 | ||
65324144 JDB |
476 | /* |
477 | * Check for RFC3069 proxy arp private VLAN (allow to send back to same dev) | |
478 | * | |
479 | * RFC3069 supports proxy arp replies back to the same interface. This | |
480 | * is done to support (ethernet) switch features, like RFC 3069, where | |
481 | * the individual ports are not allowed to communicate with each | |
482 | * other, BUT they are allowed to talk to the upstream router. As | |
483 | * described in RFC 3069, it is possible to allow these hosts to | |
484 | * communicate through the upstream router, by proxy_arp'ing. | |
485 | * | |
486 | * RFC 3069: "VLAN Aggregation for Efficient IP Address Allocation" | |
487 | * | |
488 | * This technology is known by different names: | |
489 | * In RFC 3069 it is called VLAN Aggregation. | |
490 | * Cisco and Allied Telesyn call it Private VLAN. | |
491 | * Hewlett-Packard call it Source-Port filtering or port-isolation. | |
492 | * Ericsson call it MAC-Forced Forwarding (RFC Draft). | |
493 | * | |
494 | */ | |
495 | static inline int arp_fwd_pvlan(struct in_device *in_dev, | |
496 | struct net_device *dev, struct rtable *rt, | |
497 | __be32 sip, __be32 tip) | |
498 | { | |
499 | /* Private VLAN is only concerned about the same ethernet segment */ | |
d8d1f30b | 500 | if (rt->dst.dev != dev) |
65324144 JDB |
501 | return 0; |
502 | ||
503 | /* Don't reply on self probes (often done by windowz boxes)*/ | |
504 | if (sip == tip) | |
505 | return 0; | |
506 | ||
507 | if (IN_DEV_PROXY_ARP_PVLAN(in_dev)) | |
508 | return 1; | |
509 | else | |
510 | return 0; | |
511 | } | |
512 | ||
1da177e4 LT |
513 | /* |
514 | * Interface to link layer: send routine and receive handler. | |
515 | */ | |
516 | ||
517 | /* | |
51456b29 | 518 | * Create an arp packet. If dest_hw is not set, we create a broadcast |
1da177e4 LT |
519 | * message. |
520 | */ | |
ed9bad06 AV |
521 | struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, |
522 | struct net_device *dev, __be32 src_ip, | |
abfdf1c4 JE |
523 | const unsigned char *dest_hw, |
524 | const unsigned char *src_hw, | |
525 | const unsigned char *target_hw) | |
1da177e4 LT |
526 | { |
527 | struct sk_buff *skb; | |
528 | struct arphdr *arp; | |
529 | unsigned char *arp_ptr; | |
66088243 HX |
530 | int hlen = LL_RESERVED_SPACE(dev); |
531 | int tlen = dev->needed_tailroom; | |
1da177e4 LT |
532 | |
533 | /* | |
534 | * Allocate a buffer | |
535 | */ | |
e905a9ed | 536 | |
66088243 | 537 | skb = alloc_skb(arp_hdr_len(dev) + hlen + tlen, GFP_ATOMIC); |
51456b29 | 538 | if (!skb) |
1da177e4 LT |
539 | return NULL; |
540 | ||
66088243 | 541 | skb_reserve(skb, hlen); |
c1d2bbe1 | 542 | skb_reset_network_header(skb); |
4df864c1 | 543 | arp = skb_put(skb, arp_hdr_len(dev)); |
1da177e4 LT |
544 | skb->dev = dev; |
545 | skb->protocol = htons(ETH_P_ARP); | |
51456b29 | 546 | if (!src_hw) |
1da177e4 | 547 | src_hw = dev->dev_addr; |
51456b29 | 548 | if (!dest_hw) |
1da177e4 LT |
549 | dest_hw = dev->broadcast; |
550 | ||
551 | /* | |
552 | * Fill the device header for the ARP frame | |
553 | */ | |
0c4e8581 | 554 | if (dev_hard_header(skb, dev, ptype, dest_hw, src_hw, skb->len) < 0) |
1da177e4 LT |
555 | goto out; |
556 | ||
557 | /* | |
558 | * Fill out the arp protocol part. | |
559 | * | |
560 | * The arp hardware type should match the device type, except for FDDI, | |
561 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
562 | */ | |
563 | /* | |
564 | * Exceptions everywhere. AX.25 uses the AX.25 PID value not the | |
565 | * DIX code for the protocol. Make these device structure fields. | |
566 | */ | |
567 | switch (dev->type) { | |
568 | default: | |
569 | arp->ar_hrd = htons(dev->type); | |
570 | arp->ar_pro = htons(ETH_P_IP); | |
571 | break; | |
572 | ||
40e4783e | 573 | #if IS_ENABLED(CONFIG_AX25) |
1da177e4 LT |
574 | case ARPHRD_AX25: |
575 | arp->ar_hrd = htons(ARPHRD_AX25); | |
576 | arp->ar_pro = htons(AX25_P_IP); | |
577 | break; | |
578 | ||
40e4783e | 579 | #if IS_ENABLED(CONFIG_NETROM) |
1da177e4 LT |
580 | case ARPHRD_NETROM: |
581 | arp->ar_hrd = htons(ARPHRD_NETROM); | |
582 | arp->ar_pro = htons(AX25_P_IP); | |
583 | break; | |
584 | #endif | |
585 | #endif | |
586 | ||
40e4783e | 587 | #if IS_ENABLED(CONFIG_FDDI) |
1da177e4 LT |
588 | case ARPHRD_FDDI: |
589 | arp->ar_hrd = htons(ARPHRD_ETHER); | |
590 | arp->ar_pro = htons(ETH_P_IP); | |
591 | break; | |
1da177e4 LT |
592 | #endif |
593 | } | |
594 | ||
595 | arp->ar_hln = dev->addr_len; | |
596 | arp->ar_pln = 4; | |
597 | arp->ar_op = htons(type); | |
598 | ||
deffd777 | 599 | arp_ptr = (unsigned char *)(arp + 1); |
1da177e4 LT |
600 | |
601 | memcpy(arp_ptr, src_hw, dev->addr_len); | |
f4cca7ff JK |
602 | arp_ptr += dev->addr_len; |
603 | memcpy(arp_ptr, &src_ip, 4); | |
604 | arp_ptr += 4; | |
6752c8db YH |
605 | |
606 | switch (dev->type) { | |
607 | #if IS_ENABLED(CONFIG_FIREWIRE_NET) | |
608 | case ARPHRD_IEEE1394: | |
609 | break; | |
610 | #endif | |
611 | default: | |
00db4124 | 612 | if (target_hw) |
6752c8db YH |
613 | memcpy(arp_ptr, target_hw, dev->addr_len); |
614 | else | |
615 | memset(arp_ptr, 0, dev->addr_len); | |
616 | arp_ptr += dev->addr_len; | |
617 | } | |
1da177e4 LT |
618 | memcpy(arp_ptr, &dest_ip, 4); |
619 | ||
620 | return skb; | |
621 | ||
622 | out: | |
623 | kfree_skb(skb); | |
624 | return NULL; | |
625 | } | |
4bc2f18b | 626 | EXPORT_SYMBOL(arp_create); |
1da177e4 | 627 | |
0c4b51f0 | 628 | static int arp_xmit_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
f9e4306f EB |
629 | { |
630 | return dev_queue_xmit(skb); | |
631 | } | |
632 | ||
1da177e4 LT |
633 | /* |
634 | * Send an arp packet. | |
635 | */ | |
636 | void arp_xmit(struct sk_buff *skb) | |
637 | { | |
638 | /* Send it off, maybe filter it using firewalling first. */ | |
29a26a56 EB |
639 | NF_HOOK(NFPROTO_ARP, NF_ARP_OUT, |
640 | dev_net(skb->dev), NULL, skb, NULL, skb->dev, | |
641 | arp_xmit_finish); | |
1da177e4 | 642 | } |
4bc2f18b | 643 | EXPORT_SYMBOL(arp_xmit); |
1da177e4 | 644 | |
d9ef2e7b IH |
645 | static bool arp_is_garp(struct net *net, struct net_device *dev, |
646 | int *addr_type, __be16 ar_op, | |
6fd05633 IH |
647 | __be32 sip, __be32 tip, |
648 | unsigned char *sha, unsigned char *tha) | |
649 | { | |
d9ef2e7b | 650 | bool is_garp = tip == sip; |
6fd05633 IH |
651 | |
652 | /* Gratuitous ARP _replies_ also require target hwaddr to be | |
653 | * the same as source. | |
654 | */ | |
655 | if (is_garp && ar_op == htons(ARPOP_REPLY)) | |
656 | is_garp = | |
657 | /* IPv4 over IEEE 1394 doesn't provide target | |
658 | * hardware address field in its ARP payload. | |
659 | */ | |
660 | tha && | |
661 | !memcmp(tha, sha, dev->addr_len); | |
662 | ||
d9ef2e7b IH |
663 | if (is_garp) { |
664 | *addr_type = inet_addr_type_dev_table(net, dev, sip); | |
665 | if (*addr_type != RTN_UNICAST) | |
666 | is_garp = false; | |
667 | } | |
6fd05633 IH |
668 | return is_garp; |
669 | } | |
670 | ||
1da177e4 LT |
671 | /* |
672 | * Process an arp request. | |
673 | */ | |
674 | ||
0c4b51f0 | 675 | static int arp_process(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
676 | { |
677 | struct net_device *dev = skb->dev; | |
faa9dcf7 | 678 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
679 | struct arphdr *arp; |
680 | unsigned char *arp_ptr; | |
681 | struct rtable *rt; | |
e0260fed | 682 | unsigned char *sha; |
23d268eb | 683 | unsigned char *tha = NULL; |
9e12bb22 | 684 | __be32 sip, tip; |
1da177e4 LT |
685 | u16 dev_type = dev->type; |
686 | int addr_type; | |
687 | struct neighbour *n; | |
63d008a4 | 688 | struct dst_entry *reply_dst = NULL; |
56022a8f | 689 | bool is_garp = false; |
1da177e4 LT |
690 | |
691 | /* arp_rcv below verifies the ARP header and verifies the device | |
692 | * is ARP'able. | |
693 | */ | |
694 | ||
51456b29 | 695 | if (!in_dev) |
8dfd329f | 696 | goto out_free_skb; |
1da177e4 | 697 | |
d0a92be0 | 698 | arp = arp_hdr(skb); |
1da177e4 LT |
699 | |
700 | switch (dev_type) { | |
e905a9ed | 701 | default: |
1da177e4 LT |
702 | if (arp->ar_pro != htons(ETH_P_IP) || |
703 | htons(dev_type) != arp->ar_hrd) | |
8dfd329f | 704 | goto out_free_skb; |
1da177e4 | 705 | break; |
1da177e4 | 706 | case ARPHRD_ETHER: |
1da177e4 | 707 | case ARPHRD_FDDI: |
1da177e4 | 708 | case ARPHRD_IEEE802: |
1da177e4 | 709 | /* |
211ed865 | 710 | * ETHERNET, and Fibre Channel (which are IEEE 802 |
1da177e4 LT |
711 | * devices, according to RFC 2625) devices will accept ARP |
712 | * hardware types of either 1 (Ethernet) or 6 (IEEE 802.2). | |
713 | * This is the case also of FDDI, where the RFC 1390 says that | |
714 | * FDDI devices should accept ARP hardware of (1) Ethernet, | |
715 | * however, to be more robust, we'll accept both 1 (Ethernet) | |
716 | * or 6 (IEEE 802.2) | |
717 | */ | |
718 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
719 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
720 | arp->ar_pro != htons(ETH_P_IP)) | |
8dfd329f | 721 | goto out_free_skb; |
1da177e4 | 722 | break; |
1da177e4 LT |
723 | case ARPHRD_AX25: |
724 | if (arp->ar_pro != htons(AX25_P_IP) || | |
725 | arp->ar_hrd != htons(ARPHRD_AX25)) | |
8dfd329f | 726 | goto out_free_skb; |
1da177e4 | 727 | break; |
1da177e4 LT |
728 | case ARPHRD_NETROM: |
729 | if (arp->ar_pro != htons(AX25_P_IP) || | |
730 | arp->ar_hrd != htons(ARPHRD_NETROM)) | |
8dfd329f | 731 | goto out_free_skb; |
1da177e4 | 732 | break; |
1da177e4 LT |
733 | } |
734 | ||
735 | /* Understand only these message types */ | |
736 | ||
737 | if (arp->ar_op != htons(ARPOP_REPLY) && | |
738 | arp->ar_op != htons(ARPOP_REQUEST)) | |
8dfd329f | 739 | goto out_free_skb; |
1da177e4 LT |
740 | |
741 | /* | |
742 | * Extract fields | |
743 | */ | |
deffd777 | 744 | arp_ptr = (unsigned char *)(arp + 1); |
1da177e4 LT |
745 | sha = arp_ptr; |
746 | arp_ptr += dev->addr_len; | |
747 | memcpy(&sip, arp_ptr, 4); | |
748 | arp_ptr += 4; | |
6752c8db YH |
749 | switch (dev_type) { |
750 | #if IS_ENABLED(CONFIG_FIREWIRE_NET) | |
751 | case ARPHRD_IEEE1394: | |
752 | break; | |
753 | #endif | |
754 | default: | |
23d268eb | 755 | tha = arp_ptr; |
6752c8db YH |
756 | arp_ptr += dev->addr_len; |
757 | } | |
1da177e4 | 758 | memcpy(&tip, arp_ptr, 4); |
e905a9ed | 759 | /* |
1da177e4 LT |
760 | * Check for bad requests for 127.x.x.x and requests for multicast |
761 | * addresses. If this is one such, delete it. | |
762 | */ | |
d0daebc3 TG |
763 | if (ipv4_is_multicast(tip) || |
764 | (!IN_DEV_ROUTE_LOCALNET(in_dev) && ipv4_is_loopback(tip))) | |
8dfd329f | 765 | goto out_free_skb; |
1da177e4 | 766 | |
97daf331 JB |
767 | /* |
768 | * For some 802.11 wireless deployments (and possibly other networks), | |
769 | * there will be an ARP proxy and gratuitous ARP frames are attacks | |
770 | * and thus should not be accepted. | |
771 | */ | |
772 | if (sip == tip && IN_DEV_ORCONF(in_dev, DROP_GRATUITOUS_ARP)) | |
8dfd329f | 773 | goto out_free_skb; |
97daf331 | 774 | |
1da177e4 LT |
775 | /* |
776 | * Special case: We must set Frame Relay source Q.922 address | |
777 | */ | |
778 | if (dev_type == ARPHRD_DLCI) | |
779 | sha = dev->broadcast; | |
780 | ||
781 | /* | |
782 | * Process entry. The idea here is we want to send a reply if it is a | |
783 | * request for us or if it is a request for someone else that we hold | |
784 | * a proxy for. We want to add an entry to our cache if it is a reply | |
e905a9ed YH |
785 | * to us or if it is a request for our address. |
786 | * (The assumption for this last is that if someone is requesting our | |
787 | * address, they are probably intending to talk to us, so it saves time | |
788 | * if we cache their address. Their address is also probably not in | |
1da177e4 | 789 | * our cache, since ours is not in their cache.) |
e905a9ed | 790 | * |
1da177e4 LT |
791 | * Putting this another way, we only care about replies if they are to |
792 | * us, in which case we add them to the cache. For requests, we care | |
793 | * about those for us and those for our proxies. We reply to both, | |
e905a9ed | 794 | * and in the case of requests for us we add the requester to the arp |
1da177e4 LT |
795 | * cache. |
796 | */ | |
797 | ||
63d008a4 JB |
798 | if (arp->ar_op == htons(ARPOP_REQUEST) && skb_metadata_dst(skb)) |
799 | reply_dst = (struct dst_entry *) | |
800 | iptunnel_metadata_reply(skb_metadata_dst(skb), | |
801 | GFP_ATOMIC); | |
802 | ||
f8a68e75 EB |
803 | /* Special case: IPv4 duplicate address detection packet (RFC2131) */ |
804 | if (sip == 0) { | |
1da177e4 | 805 | if (arp->ar_op == htons(ARPOP_REQUEST) && |
30bbaa19 | 806 | inet_addr_type_dev_table(net, dev, tip) == RTN_LOCAL && |
9bd85e32 | 807 | !arp_ignore(in_dev, sip, tip)) |
63d008a4 JB |
808 | arp_send_dst(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, |
809 | sha, dev->dev_addr, sha, reply_dst); | |
8dfd329f | 810 | goto out_consume_skb; |
1da177e4 LT |
811 | } |
812 | ||
813 | if (arp->ar_op == htons(ARPOP_REQUEST) && | |
c6cffba4 | 814 | ip_route_input_noref(skb, tip, sip, 0, dev) == 0) { |
1da177e4 | 815 | |
511c3f92 | 816 | rt = skb_rtable(skb); |
1da177e4 LT |
817 | addr_type = rt->rt_type; |
818 | ||
819 | if (addr_type == RTN_LOCAL) { | |
deffd777 | 820 | int dont_send; |
8164f1b7 | 821 | |
deffd777 | 822 | dont_send = arp_ignore(in_dev, sip, tip); |
8164f1b7 | 823 | if (!dont_send && IN_DEV_ARPFILTER(in_dev)) |
ae9c416d | 824 | dont_send = arp_filter(sip, tip, dev); |
8164f1b7 BG |
825 | if (!dont_send) { |
826 | n = neigh_event_ns(&arp_tbl, sha, &sip, dev); | |
827 | if (n) { | |
63d008a4 JB |
828 | arp_send_dst(ARPOP_REPLY, ETH_P_ARP, |
829 | sip, dev, tip, sha, | |
830 | dev->dev_addr, sha, | |
831 | reply_dst); | |
8164f1b7 BG |
832 | neigh_release(n); |
833 | } | |
1da177e4 | 834 | } |
8dfd329f | 835 | goto out_consume_skb; |
1da177e4 | 836 | } else if (IN_DEV_FORWARD(in_dev)) { |
65324144 JDB |
837 | if (addr_type == RTN_UNICAST && |
838 | (arp_fwd_proxy(in_dev, dev, rt) || | |
839 | arp_fwd_pvlan(in_dev, dev, rt, sip, tip) || | |
70620c46 TG |
840 | (rt->dst.dev != dev && |
841 | pneigh_lookup(&arp_tbl, net, &tip, dev, 0)))) { | |
1da177e4 LT |
842 | n = neigh_event_ns(&arp_tbl, sha, &sip, dev); |
843 | if (n) | |
844 | neigh_release(n); | |
845 | ||
e905a9ed | 846 | if (NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED || |
1da177e4 | 847 | skb->pkt_type == PACKET_HOST || |
1f9248e5 | 848 | NEIGH_VAR(in_dev->arp_parms, PROXY_DELAY) == 0) { |
63d008a4 JB |
849 | arp_send_dst(ARPOP_REPLY, ETH_P_ARP, |
850 | sip, dev, tip, sha, | |
851 | dev->dev_addr, sha, | |
852 | reply_dst); | |
1da177e4 | 853 | } else { |
deffd777 CG |
854 | pneigh_enqueue(&arp_tbl, |
855 | in_dev->arp_parms, skb); | |
181a4224 | 856 | goto out_free_dst; |
1da177e4 | 857 | } |
8dfd329f | 858 | goto out_consume_skb; |
1da177e4 LT |
859 | } |
860 | } | |
861 | } | |
862 | ||
863 | /* Update our ARP tables */ | |
864 | ||
865 | n = __neigh_lookup(&arp_tbl, &sip, dev, 0); | |
866 | ||
5990baaa | 867 | addr_type = -1; |
7d472a59 | 868 | if (n || IN_DEV_ARP_ACCEPT(in_dev)) { |
7d472a59 IH |
869 | is_garp = arp_is_garp(net, dev, &addr_type, arp->ar_op, |
870 | sip, tip, sha, tha); | |
871 | } | |
30bbaa19 | 872 | |
7d472a59 | 873 | if (IN_DEV_ARP_ACCEPT(in_dev)) { |
abd596a4 NH |
874 | /* Unsolicited ARP is not accepted by default. |
875 | It is possible, that this option should be enabled for some | |
876 | devices (strip is candidate) | |
877 | */ | |
51456b29 | 878 | if (!n && |
d9ef2e7b IH |
879 | (is_garp || |
880 | (arp->ar_op == htons(ARPOP_REPLY) && | |
881 | (addr_type == RTN_UNICAST || | |
882 | (addr_type < 0 && | |
883 | /* postpone calculation to as late as possible */ | |
884 | inet_addr_type_dev_table(net, dev, sip) == | |
885 | RTN_UNICAST))))) | |
1b1ac759 | 886 | n = __neigh_lookup(&arp_tbl, &sip, dev, 1); |
abd596a4 | 887 | } |
1da177e4 LT |
888 | |
889 | if (n) { | |
890 | int state = NUD_REACHABLE; | |
891 | int override; | |
892 | ||
893 | /* If several different ARP replies follows back-to-back, | |
894 | use the FIRST one. It is possible, if several proxy | |
895 | agents are active. Taking the first reply prevents | |
896 | arp trashing and chooses the fastest router. | |
897 | */ | |
56022a8f SN |
898 | override = time_after(jiffies, |
899 | n->updated + | |
900 | NEIGH_VAR(n->parms, LOCKTIME)) || | |
901 | is_garp; | |
1da177e4 LT |
902 | |
903 | /* Broadcast replies and request packets | |
904 | do not assert neighbour reachability. | |
905 | */ | |
906 | if (arp->ar_op != htons(ARPOP_REPLY) || | |
907 | skb->pkt_type != PACKET_HOST) | |
908 | state = NUD_STALE; | |
deffd777 | 909 | neigh_update(n, sha, state, |
7b8f7a40 | 910 | override ? NEIGH_UPDATE_F_OVERRIDE : 0, 0); |
1da177e4 LT |
911 | neigh_release(n); |
912 | } | |
913 | ||
8dfd329f | 914 | out_consume_skb: |
ead2ceb0 | 915 | consume_skb(skb); |
8dfd329f | 916 | |
181a4224 JB |
917 | out_free_dst: |
918 | dst_release(reply_dst); | |
8dfd329f ZS |
919 | return NET_RX_SUCCESS; |
920 | ||
921 | out_free_skb: | |
922 | kfree_skb(skb); | |
923 | return NET_RX_DROP; | |
1da177e4 LT |
924 | } |
925 | ||
444fc8fc HX |
926 | static void parp_redo(struct sk_buff *skb) |
927 | { | |
0c4b51f0 | 928 | arp_process(dev_net(skb->dev), NULL, skb); |
444fc8fc HX |
929 | } |
930 | ||
1da177e4 LT |
931 | |
932 | /* | |
933 | * Receive an arp request from the device layer. | |
934 | */ | |
935 | ||
6c97e72a AB |
936 | static int arp_rcv(struct sk_buff *skb, struct net_device *dev, |
937 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 | 938 | { |
044453b3 ED |
939 | const struct arphdr *arp; |
940 | ||
825bae5d | 941 | /* do not tweak dropwatch on an ARP we will ignore */ |
044453b3 ED |
942 | if (dev->flags & IFF_NOARP || |
943 | skb->pkt_type == PACKET_OTHERHOST || | |
944 | skb->pkt_type == PACKET_LOOPBACK) | |
825bae5d | 945 | goto consumeskb; |
044453b3 ED |
946 | |
947 | skb = skb_share_check(skb, GFP_ATOMIC); | |
948 | if (!skb) | |
949 | goto out_of_mem; | |
1da177e4 LT |
950 | |
951 | /* ARP header, plus 2 device addresses, plus 2 IP addresses. */ | |
988b7050 | 952 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) |
1da177e4 LT |
953 | goto freeskb; |
954 | ||
d0a92be0 | 955 | arp = arp_hdr(skb); |
044453b3 | 956 | if (arp->ar_hln != dev->addr_len || arp->ar_pln != 4) |
1da177e4 LT |
957 | goto freeskb; |
958 | ||
a61bbcf2 PM |
959 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
960 | ||
29a26a56 EB |
961 | return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, |
962 | dev_net(dev), NULL, skb, dev, NULL, | |
963 | arp_process); | |
1da177e4 | 964 | |
825bae5d RJ |
965 | consumeskb: |
966 | consume_skb(skb); | |
8dfd329f | 967 | return NET_RX_SUCCESS; |
1da177e4 LT |
968 | freeskb: |
969 | kfree_skb(skb); | |
970 | out_of_mem: | |
8dfd329f | 971 | return NET_RX_DROP; |
1da177e4 LT |
972 | } |
973 | ||
974 | /* | |
975 | * User level interface (ioctl) | |
976 | */ | |
977 | ||
978 | /* | |
979 | * Set (create) an ARP cache entry. | |
980 | */ | |
981 | ||
32e569b7 | 982 | static int arp_req_set_proxy(struct net *net, struct net_device *dev, int on) |
f8b33fdf | 983 | { |
51456b29 | 984 | if (!dev) { |
586f1211 | 985 | IPV4_DEVCONF_ALL(net, PROXY_ARP) = on; |
f8b33fdf PE |
986 | return 0; |
987 | } | |
c506653d ED |
988 | if (__in_dev_get_rtnl(dev)) { |
989 | IN_DEV_CONF_SET(__in_dev_get_rtnl(dev), PROXY_ARP, on); | |
f8b33fdf PE |
990 | return 0; |
991 | } | |
992 | return -ENXIO; | |
993 | } | |
994 | ||
32e569b7 PE |
995 | static int arp_req_set_public(struct net *net, struct arpreq *r, |
996 | struct net_device *dev) | |
43dc1701 PE |
997 | { |
998 | __be32 ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; | |
999 | __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr; | |
1000 | ||
1001 | if (mask && mask != htonl(0xFFFFFFFF)) | |
1002 | return -EINVAL; | |
1003 | if (!dev && (r->arp_flags & ATF_COM)) { | |
941666c2 | 1004 | dev = dev_getbyhwaddr_rcu(net, r->arp_ha.sa_family, |
deffd777 | 1005 | r->arp_ha.sa_data); |
43dc1701 PE |
1006 | if (!dev) |
1007 | return -ENODEV; | |
1008 | } | |
1009 | if (mask) { | |
51456b29 | 1010 | if (!pneigh_lookup(&arp_tbl, net, &ip, dev, 1)) |
43dc1701 PE |
1011 | return -ENOBUFS; |
1012 | return 0; | |
1013 | } | |
f8b33fdf | 1014 | |
32e569b7 | 1015 | return arp_req_set_proxy(net, dev, 1); |
43dc1701 PE |
1016 | } |
1017 | ||
32e569b7 | 1018 | static int arp_req_set(struct net *net, struct arpreq *r, |
deffd777 | 1019 | struct net_device *dev) |
1da177e4 | 1020 | { |
43dc1701 | 1021 | __be32 ip; |
1da177e4 LT |
1022 | struct neighbour *neigh; |
1023 | int err; | |
1024 | ||
43dc1701 | 1025 | if (r->arp_flags & ATF_PUBL) |
32e569b7 | 1026 | return arp_req_set_public(net, r, dev); |
1da177e4 | 1027 | |
43dc1701 | 1028 | ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; |
1da177e4 LT |
1029 | if (r->arp_flags & ATF_PERM) |
1030 | r->arp_flags |= ATF_COM; | |
51456b29 | 1031 | if (!dev) { |
78fbfd8a | 1032 | struct rtable *rt = ip_route_output(net, ip, 0, RTO_ONLINK, 0); |
b23dd4fe DM |
1033 | |
1034 | if (IS_ERR(rt)) | |
1035 | return PTR_ERR(rt); | |
d8d1f30b | 1036 | dev = rt->dst.dev; |
1da177e4 LT |
1037 | ip_rt_put(rt); |
1038 | if (!dev) | |
1039 | return -EINVAL; | |
1040 | } | |
1041 | switch (dev->type) { | |
40e4783e | 1042 | #if IS_ENABLED(CONFIG_FDDI) |
1da177e4 LT |
1043 | case ARPHRD_FDDI: |
1044 | /* | |
1045 | * According to RFC 1390, FDDI devices should accept ARP | |
1046 | * hardware types of 1 (Ethernet). However, to be more | |
1047 | * robust, we'll accept hardware types of either 1 (Ethernet) | |
1048 | * or 6 (IEEE 802.2). | |
1049 | */ | |
1050 | if (r->arp_ha.sa_family != ARPHRD_FDDI && | |
1051 | r->arp_ha.sa_family != ARPHRD_ETHER && | |
1052 | r->arp_ha.sa_family != ARPHRD_IEEE802) | |
1053 | return -EINVAL; | |
1054 | break; | |
1055 | #endif | |
1056 | default: | |
1057 | if (r->arp_ha.sa_family != dev->type) | |
1058 | return -EINVAL; | |
1059 | break; | |
1060 | } | |
1061 | ||
1062 | neigh = __neigh_lookup_errno(&arp_tbl, &ip, dev); | |
1063 | err = PTR_ERR(neigh); | |
1064 | if (!IS_ERR(neigh)) { | |
95c96174 | 1065 | unsigned int state = NUD_STALE; |
1da177e4 LT |
1066 | if (r->arp_flags & ATF_PERM) |
1067 | state = NUD_PERMANENT; | |
deffd777 | 1068 | err = neigh_update(neigh, (r->arp_flags & ATF_COM) ? |
e905a9ed | 1069 | r->arp_ha.sa_data : NULL, state, |
deffd777 | 1070 | NEIGH_UPDATE_F_OVERRIDE | |
7b8f7a40 | 1071 | NEIGH_UPDATE_F_ADMIN, 0); |
1da177e4 LT |
1072 | neigh_release(neigh); |
1073 | } | |
1074 | return err; | |
1075 | } | |
1076 | ||
95c96174 | 1077 | static unsigned int arp_state_to_flags(struct neighbour *neigh) |
1da177e4 | 1078 | { |
1da177e4 | 1079 | if (neigh->nud_state&NUD_PERMANENT) |
deffd777 | 1080 | return ATF_PERM | ATF_COM; |
1da177e4 | 1081 | else if (neigh->nud_state&NUD_VALID) |
deffd777 CG |
1082 | return ATF_COM; |
1083 | else | |
1084 | return 0; | |
1da177e4 LT |
1085 | } |
1086 | ||
1087 | /* | |
1088 | * Get an ARP cache entry. | |
1089 | */ | |
1090 | ||
1091 | static int arp_req_get(struct arpreq *r, struct net_device *dev) | |
1092 | { | |
ed9bad06 | 1093 | __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr; |
1da177e4 LT |
1094 | struct neighbour *neigh; |
1095 | int err = -ENXIO; | |
1096 | ||
1097 | neigh = neigh_lookup(&arp_tbl, &ip, dev); | |
1098 | if (neigh) { | |
11c91ef9 ED |
1099 | if (!(neigh->nud_state & NUD_NOARP)) { |
1100 | read_lock_bh(&neigh->lock); | |
1101 | memcpy(r->arp_ha.sa_data, neigh->ha, dev->addr_len); | |
1102 | r->arp_flags = arp_state_to_flags(neigh); | |
1103 | read_unlock_bh(&neigh->lock); | |
1104 | r->arp_ha.sa_family = dev->type; | |
1105 | strlcpy(r->arp_dev, dev->name, sizeof(r->arp_dev)); | |
1106 | err = 0; | |
1107 | } | |
1da177e4 | 1108 | neigh_release(neigh); |
1da177e4 LT |
1109 | } |
1110 | return err; | |
1111 | } | |
1112 | ||
7195cf72 | 1113 | static int arp_invalidate(struct net_device *dev, __be32 ip) |
545ecdc3 ML |
1114 | { |
1115 | struct neighbour *neigh = neigh_lookup(&arp_tbl, &ip, dev); | |
1116 | int err = -ENXIO; | |
5071034e | 1117 | struct neigh_table *tbl = &arp_tbl; |
545ecdc3 ML |
1118 | |
1119 | if (neigh) { | |
1120 | if (neigh->nud_state & ~NUD_NOARP) | |
1121 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1122 | NEIGH_UPDATE_F_OVERRIDE| | |
7b8f7a40 | 1123 | NEIGH_UPDATE_F_ADMIN, 0); |
5071034e | 1124 | write_lock_bh(&tbl->lock); |
545ecdc3 | 1125 | neigh_release(neigh); |
5071034e SV |
1126 | neigh_remove_one(neigh, tbl); |
1127 | write_unlock_bh(&tbl->lock); | |
545ecdc3 ML |
1128 | } |
1129 | ||
1130 | return err; | |
1131 | } | |
545ecdc3 | 1132 | |
32e569b7 PE |
1133 | static int arp_req_delete_public(struct net *net, struct arpreq *r, |
1134 | struct net_device *dev) | |
46479b43 PE |
1135 | { |
1136 | __be32 ip = ((struct sockaddr_in *) &r->arp_pa)->sin_addr.s_addr; | |
1137 | __be32 mask = ((struct sockaddr_in *)&r->arp_netmask)->sin_addr.s_addr; | |
1138 | ||
1139 | if (mask == htonl(0xFFFFFFFF)) | |
2db82b53 | 1140 | return pneigh_delete(&arp_tbl, net, &ip, dev); |
46479b43 | 1141 | |
f8b33fdf PE |
1142 | if (mask) |
1143 | return -EINVAL; | |
1144 | ||
32e569b7 | 1145 | return arp_req_set_proxy(net, dev, 0); |
46479b43 PE |
1146 | } |
1147 | ||
32e569b7 | 1148 | static int arp_req_delete(struct net *net, struct arpreq *r, |
deffd777 | 1149 | struct net_device *dev) |
1da177e4 | 1150 | { |
46479b43 | 1151 | __be32 ip; |
1da177e4 | 1152 | |
46479b43 | 1153 | if (r->arp_flags & ATF_PUBL) |
32e569b7 | 1154 | return arp_req_delete_public(net, r, dev); |
1da177e4 | 1155 | |
46479b43 | 1156 | ip = ((struct sockaddr_in *)&r->arp_pa)->sin_addr.s_addr; |
51456b29 | 1157 | if (!dev) { |
78fbfd8a | 1158 | struct rtable *rt = ip_route_output(net, ip, 0, RTO_ONLINK, 0); |
b23dd4fe DM |
1159 | if (IS_ERR(rt)) |
1160 | return PTR_ERR(rt); | |
d8d1f30b | 1161 | dev = rt->dst.dev; |
1da177e4 LT |
1162 | ip_rt_put(rt); |
1163 | if (!dev) | |
1164 | return -EINVAL; | |
1165 | } | |
545ecdc3 | 1166 | return arp_invalidate(dev, ip); |
1da177e4 LT |
1167 | } |
1168 | ||
1169 | /* | |
1170 | * Handle an ARP layer I/O control request. | |
1171 | */ | |
1172 | ||
32e569b7 | 1173 | int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
1174 | { |
1175 | int err; | |
1176 | struct arpreq r; | |
1177 | struct net_device *dev = NULL; | |
1178 | ||
1179 | switch (cmd) { | |
deffd777 CG |
1180 | case SIOCDARP: |
1181 | case SIOCSARP: | |
52e804c6 | 1182 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
deffd777 | 1183 | return -EPERM; |
fcfd6dfa | 1184 | /* fall through */ |
deffd777 CG |
1185 | case SIOCGARP: |
1186 | err = copy_from_user(&r, arg, sizeof(struct arpreq)); | |
1187 | if (err) | |
1188 | return -EFAULT; | |
1189 | break; | |
1190 | default: | |
1191 | return -EINVAL; | |
1da177e4 LT |
1192 | } |
1193 | ||
1194 | if (r.arp_pa.sa_family != AF_INET) | |
1195 | return -EPFNOSUPPORT; | |
1196 | ||
1197 | if (!(r.arp_flags & ATF_PUBL) && | |
deffd777 | 1198 | (r.arp_flags & (ATF_NETMASK | ATF_DONTPUB))) |
1da177e4 LT |
1199 | return -EINVAL; |
1200 | if (!(r.arp_flags & ATF_NETMASK)) | |
1201 | ((struct sockaddr_in *)&r.arp_netmask)->sin_addr.s_addr = | |
1202 | htonl(0xFFFFFFFFUL); | |
c506653d | 1203 | rtnl_lock(); |
1da177e4 LT |
1204 | if (r.arp_dev[0]) { |
1205 | err = -ENODEV; | |
c506653d | 1206 | dev = __dev_get_by_name(net, r.arp_dev); |
51456b29 | 1207 | if (!dev) |
1da177e4 LT |
1208 | goto out; |
1209 | ||
1210 | /* Mmmm... It is wrong... ARPHRD_NETROM==0 */ | |
1211 | if (!r.arp_ha.sa_family) | |
1212 | r.arp_ha.sa_family = dev->type; | |
1213 | err = -EINVAL; | |
1214 | if ((r.arp_flags & ATF_COM) && r.arp_ha.sa_family != dev->type) | |
1215 | goto out; | |
1216 | } else if (cmd == SIOCGARP) { | |
1217 | err = -ENODEV; | |
1218 | goto out; | |
1219 | } | |
1220 | ||
132adf54 | 1221 | switch (cmd) { |
1da177e4 | 1222 | case SIOCDARP: |
32e569b7 | 1223 | err = arp_req_delete(net, &r, dev); |
1da177e4 LT |
1224 | break; |
1225 | case SIOCSARP: | |
32e569b7 | 1226 | err = arp_req_set(net, &r, dev); |
1da177e4 LT |
1227 | break; |
1228 | case SIOCGARP: | |
1229 | err = arp_req_get(&r, dev); | |
1da177e4 LT |
1230 | break; |
1231 | } | |
1232 | out: | |
c506653d | 1233 | rtnl_unlock(); |
941666c2 ED |
1234 | if (cmd == SIOCGARP && !err && copy_to_user(arg, &r, sizeof(r))) |
1235 | err = -EFAULT; | |
1da177e4 LT |
1236 | return err; |
1237 | } | |
1238 | ||
deffd777 CG |
1239 | static int arp_netdev_event(struct notifier_block *this, unsigned long event, |
1240 | void *ptr) | |
1da177e4 | 1241 | { |
351638e7 | 1242 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
6c8b4e3f | 1243 | struct netdev_notifier_change_info *change_info; |
1da177e4 LT |
1244 | |
1245 | switch (event) { | |
1246 | case NETDEV_CHANGEADDR: | |
1247 | neigh_changeaddr(&arp_tbl, dev); | |
bafa6d9d | 1248 | rt_cache_flush(dev_net(dev)); |
1da177e4 | 1249 | break; |
6c8b4e3f TT |
1250 | case NETDEV_CHANGE: |
1251 | change_info = ptr; | |
1252 | if (change_info->flags_changed & IFF_NOARP) | |
1253 | neigh_changeaddr(&arp_tbl, dev); | |
859bd2ef DA |
1254 | if (!netif_carrier_ok(dev)) |
1255 | neigh_carrier_down(&arp_tbl, dev); | |
6c8b4e3f | 1256 | break; |
1da177e4 LT |
1257 | default: |
1258 | break; | |
1259 | } | |
1260 | ||
1261 | return NOTIFY_DONE; | |
1262 | } | |
1263 | ||
1264 | static struct notifier_block arp_netdev_notifier = { | |
1265 | .notifier_call = arp_netdev_event, | |
1266 | }; | |
1267 | ||
1268 | /* Note, that it is not on notifier chain. | |
1269 | It is necessary, that this routine was called after route cache will be | |
1270 | flushed. | |
1271 | */ | |
1272 | void arp_ifdown(struct net_device *dev) | |
1273 | { | |
1274 | neigh_ifdown(&arp_tbl, dev); | |
1275 | } | |
1276 | ||
1277 | ||
1278 | /* | |
1279 | * Called once on startup. | |
1280 | */ | |
1281 | ||
7546dd97 | 1282 | static struct packet_type arp_packet_type __read_mostly = { |
09640e63 | 1283 | .type = cpu_to_be16(ETH_P_ARP), |
1da177e4 LT |
1284 | .func = arp_rcv, |
1285 | }; | |
1286 | ||
1287 | static int arp_proc_init(void); | |
1288 | ||
1289 | void __init arp_init(void) | |
1290 | { | |
d7480fd3 | 1291 | neigh_table_init(NEIGH_ARP_TABLE, &arp_tbl); |
1da177e4 LT |
1292 | |
1293 | dev_add_pack(&arp_packet_type); | |
1294 | arp_proc_init(); | |
1295 | #ifdef CONFIG_SYSCTL | |
73af614a | 1296 | neigh_sysctl_register(NULL, &arp_tbl.parms, NULL); |
1da177e4 LT |
1297 | #endif |
1298 | register_netdevice_notifier(&arp_netdev_notifier); | |
1299 | } | |
1300 | ||
1301 | #ifdef CONFIG_PROC_FS | |
40e4783e | 1302 | #if IS_ENABLED(CONFIG_AX25) |
1da177e4 LT |
1303 | |
1304 | /* ------------------------------------------------------------------------ */ | |
1305 | /* | |
1306 | * ax25 -> ASCII conversion | |
1307 | */ | |
4872e57c | 1308 | static void ax2asc2(ax25_address *a, char *buf) |
1da177e4 LT |
1309 | { |
1310 | char c, *s; | |
1311 | int n; | |
1312 | ||
1313 | for (n = 0, s = buf; n < 6; n++) { | |
1314 | c = (a->ax25_call[n] >> 1) & 0x7F; | |
1315 | ||
deffd777 CG |
1316 | if (c != ' ') |
1317 | *s++ = c; | |
1da177e4 | 1318 | } |
e905a9ed | 1319 | |
1da177e4 | 1320 | *s++ = '-'; |
deffd777 CG |
1321 | n = (a->ax25_call[6] >> 1) & 0x0F; |
1322 | if (n > 9) { | |
1da177e4 LT |
1323 | *s++ = '1'; |
1324 | n -= 10; | |
1325 | } | |
e905a9ed | 1326 | |
1da177e4 LT |
1327 | *s++ = n + '0'; |
1328 | *s++ = '\0'; | |
1329 | ||
4872e57c RB |
1330 | if (*buf == '\0' || *buf == '-') { |
1331 | buf[0] = '*'; | |
1332 | buf[1] = '\0'; | |
1333 | } | |
1da177e4 LT |
1334 | } |
1335 | #endif /* CONFIG_AX25 */ | |
1336 | ||
1337 | #define HBUFFERLEN 30 | |
1338 | ||
1339 | static void arp_format_neigh_entry(struct seq_file *seq, | |
1340 | struct neighbour *n) | |
1341 | { | |
1342 | char hbuffer[HBUFFERLEN]; | |
1da177e4 LT |
1343 | int k, j; |
1344 | char tbuf[16]; | |
1345 | struct net_device *dev = n->dev; | |
1346 | int hatype = dev->type; | |
1347 | ||
1348 | read_lock(&n->lock); | |
1349 | /* Convert hardware address to XX:XX:XX:XX ... form. */ | |
40e4783e | 1350 | #if IS_ENABLED(CONFIG_AX25) |
1da177e4 LT |
1351 | if (hatype == ARPHRD_AX25 || hatype == ARPHRD_NETROM) |
1352 | ax2asc2((ax25_address *)n->ha, hbuffer); | |
1353 | else { | |
1354 | #endif | |
1355 | for (k = 0, j = 0; k < HBUFFERLEN - 3 && j < dev->addr_len; j++) { | |
51f82a2b DC |
1356 | hbuffer[k++] = hex_asc_hi(n->ha[j]); |
1357 | hbuffer[k++] = hex_asc_lo(n->ha[j]); | |
1da177e4 LT |
1358 | hbuffer[k++] = ':'; |
1359 | } | |
a3e8ee68 | 1360 | if (k != 0) |
1361 | --k; | |
1362 | hbuffer[k] = 0; | |
40e4783e | 1363 | #if IS_ENABLED(CONFIG_AX25) |
1da177e4 LT |
1364 | } |
1365 | #endif | |
673d57e7 | 1366 | sprintf(tbuf, "%pI4", n->primary_key); |
4872e57c | 1367 | seq_printf(seq, "%-16s 0x%-10x0x%-10x%-17s * %s\n", |
1da177e4 LT |
1368 | tbuf, hatype, arp_state_to_flags(n), hbuffer, dev->name); |
1369 | read_unlock(&n->lock); | |
1370 | } | |
1371 | ||
1372 | static void arp_format_pneigh_entry(struct seq_file *seq, | |
1373 | struct pneigh_entry *n) | |
1374 | { | |
1375 | struct net_device *dev = n->dev; | |
1376 | int hatype = dev ? dev->type : 0; | |
1377 | char tbuf[16]; | |
1378 | ||
673d57e7 | 1379 | sprintf(tbuf, "%pI4", n->key); |
1da177e4 LT |
1380 | seq_printf(seq, "%-16s 0x%-10x0x%-10x%s * %s\n", |
1381 | tbuf, hatype, ATF_PUBL | ATF_PERM, "00:00:00:00:00:00", | |
1382 | dev ? dev->name : "*"); | |
1383 | } | |
1384 | ||
1385 | static int arp_seq_show(struct seq_file *seq, void *v) | |
1386 | { | |
1387 | if (v == SEQ_START_TOKEN) { | |
1388 | seq_puts(seq, "IP address HW type Flags " | |
1389 | "HW address Mask Device\n"); | |
1390 | } else { | |
1391 | struct neigh_seq_state *state = seq->private; | |
1392 | ||
1393 | if (state->flags & NEIGH_SEQ_IS_PNEIGH) | |
1394 | arp_format_pneigh_entry(seq, v); | |
1395 | else | |
1396 | arp_format_neigh_entry(seq, v); | |
1397 | } | |
1398 | ||
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | static void *arp_seq_start(struct seq_file *seq, loff_t *pos) | |
1403 | { | |
1404 | /* Don't want to confuse "arp -a" w/ magic entries, | |
1405 | * so we tell the generic iterator to skip NUD_NOARP. | |
1406 | */ | |
1407 | return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_SKIP_NOARP); | |
1408 | } | |
1409 | ||
1410 | /* ------------------------------------------------------------------------ */ | |
1411 | ||
f690808e | 1412 | static const struct seq_operations arp_seq_ops = { |
deffd777 CG |
1413 | .start = arp_seq_start, |
1414 | .next = neigh_seq_next, | |
1415 | .stop = neigh_seq_stop, | |
1416 | .show = arp_seq_show, | |
1da177e4 LT |
1417 | }; |
1418 | ||
c3506372 | 1419 | /* ------------------------------------------------------------------------ */ |
ffc31d3d DL |
1420 | |
1421 | static int __net_init arp_net_init(struct net *net) | |
1da177e4 | 1422 | { |
c3506372 CH |
1423 | if (!proc_create_net("arp", 0444, net->proc_net, &arp_seq_ops, |
1424 | sizeof(struct neigh_seq_state))) | |
1da177e4 LT |
1425 | return -ENOMEM; |
1426 | return 0; | |
1427 | } | |
1428 | ||
ffc31d3d DL |
1429 | static void __net_exit arp_net_exit(struct net *net) |
1430 | { | |
ece31ffd | 1431 | remove_proc_entry("arp", net->proc_net); |
ffc31d3d DL |
1432 | } |
1433 | ||
1434 | static struct pernet_operations arp_net_ops = { | |
1435 | .init = arp_net_init, | |
1436 | .exit = arp_net_exit, | |
1437 | }; | |
1438 | ||
1439 | static int __init arp_proc_init(void) | |
1440 | { | |
1441 | return register_pernet_subsys(&arp_net_ops); | |
1442 | } | |
1443 | ||
1da177e4 LT |
1444 | #else /* CONFIG_PROC_FS */ |
1445 | ||
1446 | static int __init arp_proc_init(void) | |
1447 | { | |
1448 | return 0; | |
1449 | } | |
1450 | ||
1451 | #endif /* CONFIG_PROC_FS */ |