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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
8237908e BDS |
6 | * Lennert Buytenhek <buytenh@gnu.org> |
7 | * Bart De Schuymer <bdschuym@pandora.be> | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Lennert dedicates this file to Kerstin Wurdinger. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/ip.h> |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/skbuff.h> | |
14c85021 | 23 | #include <linux/if_arp.h> |
1da177e4 LT |
24 | #include <linux/if_ether.h> |
25 | #include <linux/if_vlan.h> | |
516299d2 MM |
26 | #include <linux/if_pppox.h> |
27 | #include <linux/ppp_defs.h> | |
1da177e4 LT |
28 | #include <linux/netfilter_bridge.h> |
29 | #include <linux/netfilter_ipv4.h> | |
30 | #include <linux/netfilter_ipv6.h> | |
31 | #include <linux/netfilter_arp.h> | |
32 | #include <linux/in_route.h> | |
f216f082 | 33 | #include <linux/inetdevice.h> |
14c85021 | 34 | |
1da177e4 LT |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
14c85021 ACM |
37 | #include <net/route.h> |
38 | ||
1da177e4 | 39 | #include <asm/uaccess.h> |
1da177e4 LT |
40 | #include "br_private.h" |
41 | #ifdef CONFIG_SYSCTL | |
42 | #include <linux/sysctl.h> | |
43 | #endif | |
44 | ||
45 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
46 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
47 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
48 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 49 | |
1da177e4 LT |
50 | #ifdef CONFIG_SYSCTL |
51 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
52 | static int brnf_call_iptables __read_mostly = 1; |
53 | static int brnf_call_ip6tables __read_mostly = 1; | |
54 | static int brnf_call_arptables __read_mostly = 1; | |
47e0e1ca HX |
55 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
56 | static int brnf_filter_pppoe_tagged __read_mostly = 0; | |
1da177e4 | 57 | #else |
47e0e1ca HX |
58 | #define brnf_filter_vlan_tagged 0 |
59 | #define brnf_filter_pppoe_tagged 0 | |
1da177e4 LT |
60 | #endif |
61 | ||
b6f99a21 | 62 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 SH |
63 | { |
64 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
65 | } | |
66 | ||
67 | #define IS_VLAN_IP(skb) \ | |
68 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
9d6f229f | 69 | vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
70 | brnf_filter_vlan_tagged) |
71 | ||
72 | #define IS_VLAN_IPV6(skb) \ | |
73 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
74 | vlan_proto(skb) == htons(ETH_P_IPV6) &&\ | |
75 | brnf_filter_vlan_tagged) | |
76 | ||
77 | #define IS_VLAN_ARP(skb) \ | |
78 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
79 | vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
80 | brnf_filter_vlan_tagged) | |
1da177e4 | 81 | |
516299d2 MM |
82 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
83 | { | |
84 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
85 | sizeof(struct pppoe_hdr))); | |
86 | } | |
87 | ||
88 | #define IS_PPPOE_IP(skb) \ | |
89 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
90 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
91 | brnf_filter_pppoe_tagged) | |
92 | ||
93 | #define IS_PPPOE_IPV6(skb) \ | |
94 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
95 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
96 | brnf_filter_pppoe_tagged) | |
97 | ||
631339f1 HX |
98 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
99 | { | |
100 | } | |
101 | ||
102 | static struct dst_ops fake_dst_ops = { | |
103 | .family = AF_INET, | |
09640e63 | 104 | .protocol = cpu_to_be16(ETH_P_IP), |
631339f1 | 105 | .update_pmtu = fake_update_pmtu, |
631339f1 HX |
106 | .entries = ATOMIC_INIT(0), |
107 | }; | |
108 | ||
4adf0af6 SW |
109 | /* |
110 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
111 | * Currently, we fill in the PMTU entry because netfilter |
112 | * refragmentation needs it, and the rt_flags entry because | |
113 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
114 | * require us to fill additional fields. |
115 | */ | |
116 | void br_netfilter_rtable_init(struct net_bridge *br) | |
117 | { | |
118 | struct rtable *rt = &br->fake_rtable; | |
119 | ||
120 | atomic_set(&rt->u.dst.__refcnt, 1); | |
ad619800 | 121 | rt->u.dst.dev = br->dev; |
4adf0af6 SW |
122 | rt->u.dst.path = &rt->u.dst; |
123 | rt->u.dst.metrics[RTAX_MTU - 1] = 1500; | |
124 | rt->u.dst.flags = DST_NOXFRM; | |
631339f1 | 125 | rt->u.dst.ops = &fake_dst_ops; |
4adf0af6 SW |
126 | } |
127 | ||
128 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
129 | { | |
130 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
131 | ||
132 | return port ? &port->br->fake_rtable : NULL; | |
133 | } | |
1da177e4 | 134 | |
5dce971a SH |
135 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
136 | { | |
137 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
138 | ||
139 | return port ? port->br->dev : NULL; | |
140 | } | |
1da177e4 | 141 | |
fdeabdef SH |
142 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
143 | { | |
144 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
145 | if (likely(skb->nf_bridge)) | |
146 | atomic_set(&(skb->nf_bridge->use), 1); | |
147 | ||
148 | return skb->nf_bridge; | |
149 | } | |
150 | ||
2dc2f207 PM |
151 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
152 | { | |
153 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
154 | ||
155 | if (atomic_read(&nf_bridge->use) > 1) { | |
156 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
157 | ||
158 | if (tmp) { | |
159 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
160 | atomic_set(&tmp->use, 1); | |
161 | nf_bridge_put(nf_bridge); | |
162 | } | |
163 | nf_bridge = tmp; | |
164 | } | |
165 | return nf_bridge; | |
166 | } | |
167 | ||
fc38582d PM |
168 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
169 | { | |
170 | unsigned int len = nf_bridge_encap_header_len(skb); | |
171 | ||
172 | skb_push(skb, len); | |
173 | skb->network_header -= len; | |
174 | } | |
175 | ||
176 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 177 | { |
fc38582d PM |
178 | unsigned int len = nf_bridge_encap_header_len(skb); |
179 | ||
180 | skb_pull(skb, len); | |
181 | skb->network_header += len; | |
182 | } | |
fdeabdef | 183 | |
fc38582d PM |
184 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
185 | { | |
186 | unsigned int len = nf_bridge_encap_header_len(skb); | |
187 | ||
188 | skb_pull_rcsum(skb, len); | |
189 | skb->network_header += len; | |
190 | } | |
191 | ||
192 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
193 | { | |
194 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 195 | |
d626f62b ACM |
196 | skb_copy_from_linear_data_offset(skb, -header_size, |
197 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
198 | } |
199 | ||
e179e632 BDS |
200 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
201 | { | |
202 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
203 | skb->protocol = htons(ETH_P_8021Q); | |
204 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
205 | skb->protocol = htons(ETH_P_PPP_SES); | |
206 | } | |
207 | ||
208 | /* Fill in the header for fragmented IP packets handled by | |
209 | * the IPv4 connection tracking code. | |
07317621 SH |
210 | */ |
211 | int nf_bridge_copy_header(struct sk_buff *skb) | |
212 | { | |
213 | int err; | |
e179e632 | 214 | unsigned int header_size; |
07317621 | 215 | |
e179e632 BDS |
216 | nf_bridge_update_protocol(skb); |
217 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 218 | err = skb_cow_head(skb, header_size); |
07317621 SH |
219 | if (err) |
220 | return err; | |
221 | ||
27d7ff46 ACM |
222 | skb_copy_to_linear_data_offset(skb, -header_size, |
223 | skb->nf_bridge->data, header_size); | |
fc38582d | 224 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
225 | return 0; |
226 | } | |
227 | ||
1da177e4 LT |
228 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
229 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
230 | * bridge PRE_ROUTING hook. */ | |
231 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
232 | { | |
233 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 234 | struct rtable *rt; |
1da177e4 | 235 | |
1da177e4 LT |
236 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
237 | skb->pkt_type = PACKET_OTHERHOST; | |
238 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
239 | } | |
240 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
241 | ||
511c3f92 ED |
242 | rt = bridge_parent_rtable(nf_bridge->physindev); |
243 | if (!rt) { | |
4adf0af6 SW |
244 | kfree_skb(skb); |
245 | return 0; | |
246 | } | |
511c3f92 | 247 | dst_hold(&rt->u.dst); |
adf30907 | 248 | skb_dst_set(skb, &rt->u.dst); |
1da177e4 LT |
249 | |
250 | skb->dev = nf_bridge->physindev; | |
e179e632 | 251 | nf_bridge_update_protocol(skb); |
fc38582d | 252 | nf_bridge_push_encap_header(skb); |
713aefa3 | 253 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
254 | br_handle_frame_finish, 1); |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
e179e632 BDS |
259 | /* Obtain the correct destination MAC address, while preserving the original |
260 | * source MAC address. If we already know this address, we just copy it. If we | |
261 | * don't, we use the neighbour framework to find out. In both cases, we make | |
262 | * sure that br_handle_frame_finish() is called afterwards. | |
263 | */ | |
264 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
265 | { | |
266 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
267 | struct dst_entry *dst; | |
268 | ||
269 | skb->dev = bridge_parent(skb->dev); | |
270 | if (!skb->dev) | |
271 | goto free_skb; | |
272 | dst = skb_dst(skb); | |
273 | if (dst->hh) { | |
274 | neigh_hh_bridge(dst->hh, skb); | |
275 | skb->dev = nf_bridge->physindev; | |
276 | return br_handle_frame_finish(skb); | |
277 | } else if (dst->neighbour) { | |
278 | /* the neighbour function below overwrites the complete | |
279 | * MAC header, so we save the Ethernet source address and | |
280 | * protocol number. */ | |
281 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
282 | /* tell br_dev_xmit to continue with forwarding */ | |
283 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
284 | return dst->neighbour->output(skb); | |
285 | } | |
286 | free_skb: | |
287 | kfree_skb(skb); | |
288 | return 0; | |
289 | } | |
290 | ||
1da177e4 | 291 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 292 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
293 | * |
294 | * There are two cases to consider: | |
295 | * 1. The packet was DNAT'ed to a device in the same bridge | |
296 | * port group as it was received on. We can still bridge | |
297 | * the packet. | |
298 | * 2. The packet was DNAT'ed to a different device, either | |
299 | * a non-bridged device or another bridge port group. | |
300 | * The packet will need to be routed. | |
301 | * | |
302 | * The correct way of distinguishing between these two cases is to | |
303 | * call ip_route_input() and to look at skb->dst->dev, which is | |
304 | * changed to the destination device if ip_route_input() succeeds. | |
305 | * | |
ea2d9b41 | 306 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 307 | * |
ea2d9b41 BDS |
308 | * If the output device equals the logical bridge device the packet |
309 | * came in on, we can consider this bridging. The corresponding MAC | |
310 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
311 | * Otherwise, the packet is considered to be routed and we just |
312 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
313 | * later be passed up to the IP stack to be routed. For a redirected |
314 | * packet, ip_route_input() will give back the localhost as output device, | |
315 | * which differs from the bridge device. | |
1da177e4 | 316 | * |
ea2d9b41 | 317 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 318 | * |
f216f082 BDS |
319 | * This can be because the destination address is martian, in which case |
320 | * the packet will be dropped. | |
ea2d9b41 BDS |
321 | * If IP forwarding is disabled, ip_route_input() will fail, while |
322 | * ip_route_output_key() can return success. The source | |
323 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 324 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
325 | * if IP forwarding is enabled. If the output device equals the logical bridge |
326 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
327 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
328 | */ | |
1da177e4 LT |
329 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
330 | { | |
331 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 332 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 333 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 334 | struct rtable *rt; |
f216f082 | 335 | int err; |
1da177e4 | 336 | |
1da177e4 LT |
337 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
338 | skb->pkt_type = PACKET_OTHERHOST; | |
339 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
340 | } | |
341 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 342 | if (dnat_took_place(skb)) { |
f216f082 | 343 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
789bc3e5 SH |
344 | struct flowi fl = { |
345 | .nl_u = { | |
346 | .ip4_u = { | |
347 | .daddr = iph->daddr, | |
348 | .saddr = 0, | |
349 | .tos = RT_TOS(iph->tos) }, | |
350 | }, | |
351 | .proto = 0, | |
352 | }; | |
f3abc9b9 | 353 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
354 | |
355 | /* If err equals -EHOSTUNREACH the error is due to a | |
356 | * martian destination or due to the fact that | |
357 | * forwarding is disabled. For most martian packets, | |
358 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
359 | * martian destinations: loopback destinations and destination | |
360 | * 0.0.0.0. In both cases the packet will be dropped because the | |
361 | * destination is the loopback device and not the bridge. */ | |
362 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
363 | goto free_skb; | |
1da177e4 | 364 | |
249b6203 | 365 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
1c011bed | 366 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
367 | * require ip_forwarding. */ |
368 | if (((struct dst_entry *)rt)->dev == dev) { | |
adf30907 | 369 | skb_dst_set(skb, (struct dst_entry *)rt); |
1da177e4 LT |
370 | goto bridged_dnat; |
371 | } | |
1da177e4 LT |
372 | dst_release((struct dst_entry *)rt); |
373 | } | |
f216f082 | 374 | free_skb: |
1da177e4 LT |
375 | kfree_skb(skb); |
376 | return 0; | |
377 | } else { | |
adf30907 | 378 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 379 | bridged_dnat: |
1da177e4 | 380 | skb->dev = nf_bridge->physindev; |
e179e632 | 381 | nf_bridge_update_protocol(skb); |
fc38582d | 382 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
383 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
384 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
385 | skb, skb->dev, NULL, |
386 | br_nf_pre_routing_finish_bridge, | |
387 | 1); | |
388 | return 0; | |
389 | } | |
789bc3e5 | 390 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
391 | skb->pkt_type = PACKET_HOST; |
392 | } | |
393 | } else { | |
511c3f92 ED |
394 | rt = bridge_parent_rtable(nf_bridge->physindev); |
395 | if (!rt) { | |
4adf0af6 SW |
396 | kfree_skb(skb); |
397 | return 0; | |
398 | } | |
511c3f92 | 399 | dst_hold(&rt->u.dst); |
adf30907 | 400 | skb_dst_set(skb, &rt->u.dst); |
1da177e4 LT |
401 | } |
402 | ||
403 | skb->dev = nf_bridge->physindev; | |
e179e632 | 404 | nf_bridge_update_protocol(skb); |
fc38582d | 405 | nf_bridge_push_encap_header(skb); |
713aefa3 | 406 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
407 | br_handle_frame_finish, 1); |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 413 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
414 | { |
415 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
416 | ||
417 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
418 | skb->pkt_type = PACKET_HOST; | |
419 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
420 | } | |
421 | ||
422 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
423 | nf_bridge->physindev = skb->dev; | |
424 | skb->dev = bridge_parent(skb->dev); | |
e179e632 BDS |
425 | if (skb->protocol == htons(ETH_P_8021Q)) |
426 | nf_bridge->mask |= BRNF_8021Q; | |
427 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
428 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
429 | |
430 | return skb->dev; | |
1da177e4 LT |
431 | } |
432 | ||
433 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
434 | static int check_hbh_len(struct sk_buff *skb) | |
435 | { | |
0660e03f | 436 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 437 | u32 pkt_len; |
d56f90a7 ACM |
438 | const unsigned char *nh = skb_network_header(skb); |
439 | int off = raw - nh; | |
789bc3e5 | 440 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
441 | |
442 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
443 | goto bad; | |
444 | ||
445 | off += 2; | |
446 | len -= 2; | |
447 | ||
448 | while (len > 0) { | |
d56f90a7 | 449 | int optlen = nh[off + 1] + 2; |
1da177e4 | 450 | |
d56f90a7 | 451 | switch (nh[off]) { |
1da177e4 LT |
452 | case IPV6_TLV_PAD0: |
453 | optlen = 1; | |
454 | break; | |
455 | ||
456 | case IPV6_TLV_PADN: | |
457 | break; | |
458 | ||
459 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 460 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 461 | goto bad; |
d56f90a7 | 462 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 463 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 464 | ipv6_hdr(skb)->payload_len) |
b0366486 | 465 | goto bad; |
1da177e4 LT |
466 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
467 | goto bad; | |
b0366486 | 468 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 469 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 470 | goto bad; |
d56f90a7 | 471 | nh = skb_network_header(skb); |
1da177e4 LT |
472 | break; |
473 | default: | |
474 | if (optlen > len) | |
475 | goto bad; | |
476 | break; | |
477 | } | |
478 | off += optlen; | |
479 | len -= optlen; | |
480 | } | |
481 | if (len == 0) | |
482 | return 0; | |
483 | bad: | |
484 | return -1; | |
485 | ||
486 | } | |
487 | ||
488 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
489 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
490 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
491 | struct sk_buff *skb, |
492 | const struct net_device *in, | |
493 | const struct net_device *out, | |
494 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
495 | { |
496 | struct ipv6hdr *hdr; | |
497 | u32 pkt_len; | |
1da177e4 LT |
498 | |
499 | if (skb->len < sizeof(struct ipv6hdr)) | |
500 | goto inhdr_error; | |
501 | ||
502 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
503 | goto inhdr_error; | |
504 | ||
0660e03f | 505 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
506 | |
507 | if (hdr->version != 6) | |
508 | goto inhdr_error; | |
509 | ||
510 | pkt_len = ntohs(hdr->payload_len); | |
511 | ||
512 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
513 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
514 | goto inhdr_error; | |
b38dfee3 HX |
515 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
516 | goto inhdr_error; | |
1da177e4 LT |
517 | } |
518 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 519 | goto inhdr_error; |
1da177e4 | 520 | |
789bc3e5 | 521 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 522 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 523 | return NF_DROP; |
5dce971a SH |
524 | if (!setup_pre_routing(skb)) |
525 | return NF_DROP; | |
1da177e4 | 526 | |
e179e632 | 527 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 528 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
529 | br_nf_pre_routing_finish_ipv6); |
530 | ||
531 | return NF_STOLEN; | |
532 | ||
533 | inhdr_error: | |
534 | return NF_DROP; | |
535 | } | |
536 | ||
537 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
538 | * Replicate the checks that IPv4 does on packet reception. | |
539 | * Set skb->dev to the bridge device (i.e. parent of the | |
540 | * receiving device) to make netfilter happy, the REDIRECT | |
541 | * target in particular. Save the original destination IP | |
542 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 543 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
544 | const struct net_device *in, |
545 | const struct net_device *out, | |
546 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
547 | { |
548 | struct iphdr *iph; | |
e7c243c9 EP |
549 | __u32 len = nf_bridge_encap_header_len(skb); |
550 | ||
e7c243c9 EP |
551 | if (unlikely(!pskb_may_pull(skb, len))) |
552 | goto out; | |
1da177e4 | 553 | |
516299d2 MM |
554 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
555 | IS_PPPOE_IPV6(skb)) { | |
1da177e4 LT |
556 | #ifdef CONFIG_SYSCTL |
557 | if (!brnf_call_ip6tables) | |
558 | return NF_ACCEPT; | |
559 | #endif | |
fc38582d | 560 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
561 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
562 | } | |
563 | #ifdef CONFIG_SYSCTL | |
564 | if (!brnf_call_iptables) | |
565 | return NF_ACCEPT; | |
566 | #endif | |
567 | ||
516299d2 MM |
568 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
569 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
570 | return NF_ACCEPT; |
571 | ||
fc38582d | 572 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
573 | |
574 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
575 | goto inhdr_error; | |
576 | ||
eddc9ec5 | 577 | iph = ip_hdr(skb); |
1da177e4 LT |
578 | if (iph->ihl < 5 || iph->version != 4) |
579 | goto inhdr_error; | |
580 | ||
789bc3e5 | 581 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
582 | goto inhdr_error; |
583 | ||
eddc9ec5 | 584 | iph = ip_hdr(skb); |
789bc3e5 | 585 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
586 | goto inhdr_error; |
587 | ||
588 | len = ntohs(iph->tot_len); | |
789bc3e5 | 589 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
590 | goto inhdr_error; |
591 | ||
b38dfee3 | 592 | pskb_trim_rcsum(skb, len); |
1da177e4 | 593 | |
789bc3e5 | 594 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 595 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 596 | return NF_DROP; |
5dce971a SH |
597 | if (!setup_pre_routing(skb)) |
598 | return NF_DROP; | |
1da177e4 | 599 | store_orig_dstaddr(skb); |
e179e632 | 600 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 601 | |
713aefa3 | 602 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
603 | br_nf_pre_routing_finish); |
604 | ||
605 | return NF_STOLEN; | |
606 | ||
607 | inhdr_error: | |
789bc3e5 | 608 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
609 | out: |
610 | return NF_DROP; | |
611 | } | |
612 | ||
613 | ||
614 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
615 | /* The packet is locally destined, which requires a real | |
616 | * dst_entry, so detach the fake one. On the way up, the | |
617 | * packet would pass through PRE_ROUTING again (which already | |
618 | * took place when the packet entered the bridge), but we | |
619 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
620 | * prevent this from happening. */ | |
3db05fea | 621 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
622 | const struct net_device *in, |
623 | const struct net_device *out, | |
624 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 625 | { |
511c3f92 ED |
626 | struct rtable *rt = skb_rtable(skb); |
627 | ||
adf30907 ED |
628 | if (rt && rt == bridge_parent_rtable(in)) |
629 | skb_dst_drop(skb); | |
1da177e4 LT |
630 | |
631 | return NF_ACCEPT; | |
632 | } | |
633 | ||
1da177e4 LT |
634 | /* PF_BRIDGE/FORWARD *************************************************/ |
635 | static int br_nf_forward_finish(struct sk_buff *skb) | |
636 | { | |
637 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
638 | struct net_device *in; | |
1da177e4 | 639 | |
8b42ec39 | 640 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
641 | in = nf_bridge->physindev; |
642 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
643 | skb->pkt_type = PACKET_OTHERHOST; | |
644 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
645 | } | |
646 | } else { | |
647 | in = *((struct net_device **)(skb->cb)); | |
648 | } | |
e179e632 | 649 | nf_bridge_update_protocol(skb); |
fc38582d | 650 | nf_bridge_push_encap_header(skb); |
e179e632 | 651 | |
713aefa3 | 652 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 653 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
654 | return 0; |
655 | } | |
656 | ||
657 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
658 | * netfilter with indev and outdev set to the bridge device, | |
659 | * but we are still able to filter on the 'real' indev/outdev | |
660 | * because of the physdev module. For ARP, indev and outdev are the | |
661 | * bridge ports. */ | |
3db05fea | 662 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
663 | const struct net_device *in, |
664 | const struct net_device *out, | |
665 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 666 | { |
1da177e4 | 667 | struct nf_bridge_info *nf_bridge; |
5dce971a | 668 | struct net_device *parent; |
76108cea | 669 | u_int8_t pf; |
1da177e4 LT |
670 | |
671 | if (!skb->nf_bridge) | |
672 | return NF_ACCEPT; | |
673 | ||
2dc2f207 PM |
674 | /* Need exclusive nf_bridge_info since we might have multiple |
675 | * different physoutdevs. */ | |
676 | if (!nf_bridge_unshare(skb)) | |
677 | return NF_DROP; | |
678 | ||
5dce971a SH |
679 | parent = bridge_parent(out); |
680 | if (!parent) | |
681 | return NF_DROP; | |
682 | ||
516299d2 MM |
683 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
684 | IS_PPPOE_IP(skb)) | |
1da177e4 | 685 | pf = PF_INET; |
a2bd40ad HX |
686 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
687 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 688 | pf = PF_INET6; |
a2bd40ad HX |
689 | else |
690 | return NF_ACCEPT; | |
1da177e4 | 691 | |
3db05fea | 692 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 693 | |
1da177e4 LT |
694 | nf_bridge = skb->nf_bridge; |
695 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
696 | skb->pkt_type = PACKET_HOST; | |
697 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
698 | } | |
699 | ||
700 | /* The physdev module checks on this */ | |
701 | nf_bridge->mask |= BRNF_BRIDGED; | |
702 | nf_bridge->physoutdev = skb->dev; | |
e179e632 BDS |
703 | if (pf == PF_INET) |
704 | skb->protocol = htons(ETH_P_IP); | |
705 | else | |
706 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 707 | |
6e23ae2a | 708 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 709 | br_nf_forward_finish); |
1da177e4 LT |
710 | |
711 | return NF_STOLEN; | |
712 | } | |
713 | ||
3db05fea | 714 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
715 | const struct net_device *in, |
716 | const struct net_device *out, | |
717 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 718 | { |
1da177e4 LT |
719 | struct net_device **d = (struct net_device **)(skb->cb); |
720 | ||
721 | #ifdef CONFIG_SYSCTL | |
722 | if (!brnf_call_arptables) | |
723 | return NF_ACCEPT; | |
724 | #endif | |
725 | ||
f8a26028 | 726 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 727 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 728 | return NF_ACCEPT; |
3db05fea | 729 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
730 | } |
731 | ||
d0a92be0 | 732 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 733 | if (IS_VLAN_ARP(skb)) |
3db05fea | 734 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
735 | return NF_ACCEPT; |
736 | } | |
737 | *d = (struct net_device *)in; | |
fdc9314c | 738 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
739 | (struct net_device *)out, br_nf_forward_finish); |
740 | ||
741 | return NF_STOLEN; | |
742 | } | |
743 | ||
c197facc | 744 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
2e2f7aef PM |
745 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
746 | { | |
e179e632 | 747 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 748 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
89114afd | 749 | !skb_is_gso(skb)) |
2e2f7aef PM |
750 | return ip_fragment(skb, br_dev_queue_push_xmit); |
751 | else | |
752 | return br_dev_queue_push_xmit(skb); | |
753 | } | |
c197facc | 754 | #else |
755 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
756 | { | |
757 | return br_dev_queue_push_xmit(skb); | |
758 | } | |
759 | #endif | |
1da177e4 LT |
760 | |
761 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 762 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
763 | const struct net_device *in, |
764 | const struct net_device *out, | |
765 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 766 | { |
3db05fea | 767 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 768 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 769 | u_int8_t pf; |
1da177e4 | 770 | |
ea2d9b41 | 771 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
772 | return NF_ACCEPT; |
773 | ||
5dce971a SH |
774 | if (!realoutdev) |
775 | return NF_DROP; | |
776 | ||
516299d2 MM |
777 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
778 | IS_PPPOE_IP(skb)) | |
1da177e4 | 779 | pf = PF_INET; |
a2bd40ad HX |
780 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
781 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 782 | pf = PF_INET6; |
a2bd40ad HX |
783 | else |
784 | return NF_ACCEPT; | |
1da177e4 | 785 | |
1da177e4 LT |
786 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
787 | * about the value of skb->pkt_type. */ | |
788 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
789 | skb->pkt_type = PACKET_HOST; | |
790 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
791 | } | |
792 | ||
fc38582d | 793 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 794 | nf_bridge_save_header(skb); |
e179e632 BDS |
795 | if (pf == PF_INET) |
796 | skb->protocol = htons(ETH_P_IP); | |
797 | else | |
798 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 799 | |
6e23ae2a | 800 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 801 | br_nf_dev_queue_xmit); |
1da177e4 LT |
802 | |
803 | return NF_STOLEN; | |
1da177e4 LT |
804 | } |
805 | ||
1da177e4 LT |
806 | /* IP/SABOTAGE *****************************************************/ |
807 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
808 | * for the second time. */ | |
3db05fea | 809 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
810 | const struct net_device *in, |
811 | const struct net_device *out, | |
812 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 813 | { |
3db05fea HX |
814 | if (skb->nf_bridge && |
815 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
816 | return NF_STOP; |
817 | } | |
818 | ||
819 | return NF_ACCEPT; | |
820 | } | |
821 | ||
ea2d9b41 BDS |
822 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
823 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 824 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
825 | { |
826 | .hook = br_nf_pre_routing, | |
827 | .owner = THIS_MODULE, | |
828 | .pf = PF_BRIDGE, | |
829 | .hooknum = NF_BR_PRE_ROUTING, | |
830 | .priority = NF_BR_PRI_BRNF, | |
831 | }, | |
832 | { | |
833 | .hook = br_nf_local_in, | |
834 | .owner = THIS_MODULE, | |
835 | .pf = PF_BRIDGE, | |
836 | .hooknum = NF_BR_LOCAL_IN, | |
837 | .priority = NF_BR_PRI_BRNF, | |
838 | }, | |
839 | { | |
840 | .hook = br_nf_forward_ip, | |
841 | .owner = THIS_MODULE, | |
842 | .pf = PF_BRIDGE, | |
843 | .hooknum = NF_BR_FORWARD, | |
844 | .priority = NF_BR_PRI_BRNF - 1, | |
845 | }, | |
846 | { | |
847 | .hook = br_nf_forward_arp, | |
848 | .owner = THIS_MODULE, | |
849 | .pf = PF_BRIDGE, | |
850 | .hooknum = NF_BR_FORWARD, | |
851 | .priority = NF_BR_PRI_BRNF, | |
852 | }, | |
1490fd89 CG |
853 | { |
854 | .hook = br_nf_post_routing, | |
855 | .owner = THIS_MODULE, | |
856 | .pf = PF_BRIDGE, | |
857 | .hooknum = NF_BR_POST_ROUTING, | |
858 | .priority = NF_BR_PRI_LAST, | |
859 | }, | |
860 | { | |
861 | .hook = ip_sabotage_in, | |
862 | .owner = THIS_MODULE, | |
863 | .pf = PF_INET, | |
864 | .hooknum = NF_INET_PRE_ROUTING, | |
865 | .priority = NF_IP_PRI_FIRST, | |
866 | }, | |
867 | { | |
868 | .hook = ip_sabotage_in, | |
869 | .owner = THIS_MODULE, | |
870 | .pf = PF_INET6, | |
871 | .hooknum = NF_INET_PRE_ROUTING, | |
872 | .priority = NF_IP6_PRI_FIRST, | |
873 | }, | |
1da177e4 LT |
874 | }; |
875 | ||
876 | #ifdef CONFIG_SYSCTL | |
877 | static | |
8d65af78 | 878 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 879 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
880 | { |
881 | int ret; | |
882 | ||
8d65af78 | 883 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
884 | |
885 | if (write && *(int *)(ctl->data)) | |
886 | *(int *)(ctl->data) = 1; | |
887 | return ret; | |
888 | } | |
889 | ||
890 | static ctl_table brnf_table[] = { | |
891 | { | |
1da177e4 LT |
892 | .procname = "bridge-nf-call-arptables", |
893 | .data = &brnf_call_arptables, | |
894 | .maxlen = sizeof(int), | |
895 | .mode = 0644, | |
6d9f239a | 896 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
897 | }, |
898 | { | |
1da177e4 LT |
899 | .procname = "bridge-nf-call-iptables", |
900 | .data = &brnf_call_iptables, | |
901 | .maxlen = sizeof(int), | |
902 | .mode = 0644, | |
6d9f239a | 903 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
904 | }, |
905 | { | |
1da177e4 LT |
906 | .procname = "bridge-nf-call-ip6tables", |
907 | .data = &brnf_call_ip6tables, | |
908 | .maxlen = sizeof(int), | |
909 | .mode = 0644, | |
6d9f239a | 910 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
911 | }, |
912 | { | |
1da177e4 LT |
913 | .procname = "bridge-nf-filter-vlan-tagged", |
914 | .data = &brnf_filter_vlan_tagged, | |
915 | .maxlen = sizeof(int), | |
916 | .mode = 0644, | |
6d9f239a | 917 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
918 | }, |
919 | { | |
516299d2 MM |
920 | .procname = "bridge-nf-filter-pppoe-tagged", |
921 | .data = &brnf_filter_pppoe_tagged, | |
922 | .maxlen = sizeof(int), | |
923 | .mode = 0644, | |
6d9f239a | 924 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 925 | }, |
f8572d8f | 926 | { } |
1da177e4 LT |
927 | }; |
928 | ||
b5ccd792 | 929 | static struct ctl_path brnf_path[] = { |
f8572d8f EB |
930 | { .procname = "net", }, |
931 | { .procname = "bridge", }, | |
b5ccd792 | 932 | { } |
1da177e4 LT |
933 | }; |
934 | #endif | |
935 | ||
5eb87f45 | 936 | int __init br_netfilter_init(void) |
1da177e4 | 937 | { |
5eb87f45 | 938 | int ret; |
1da177e4 | 939 | |
5eb87f45 PM |
940 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
941 | if (ret < 0) | |
1da177e4 | 942 | return ret; |
1da177e4 | 943 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 944 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 945 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
946 | printk(KERN_WARNING |
947 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 PM |
948 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
949 | return -ENOMEM; | |
1da177e4 LT |
950 | } |
951 | #endif | |
1da177e4 | 952 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
953 | return 0; |
954 | } | |
955 | ||
956 | void br_netfilter_fini(void) | |
957 | { | |
5eb87f45 | 958 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
959 | #ifdef CONFIG_SYSCTL |
960 | unregister_sysctl_table(brnf_sysctl_header); | |
961 | #endif | |
962 | } |