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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 |
4df53d8b PM |
58 | #define brnf_call_iptables 1 |
59 | #define brnf_call_ip6tables 1 | |
60 | #define brnf_call_arptables 1 | |
47e0e1ca HX |
61 | #define brnf_filter_vlan_tagged 0 |
62 | #define brnf_filter_pppoe_tagged 0 | |
1da177e4 LT |
63 | #endif |
64 | ||
b6f99a21 | 65 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 SH |
66 | { |
67 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
68 | } | |
69 | ||
70 | #define IS_VLAN_IP(skb) \ | |
71 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
9d6f229f | 72 | vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
73 | brnf_filter_vlan_tagged) |
74 | ||
75 | #define IS_VLAN_IPV6(skb) \ | |
76 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
77 | vlan_proto(skb) == htons(ETH_P_IPV6) &&\ | |
78 | brnf_filter_vlan_tagged) | |
79 | ||
80 | #define IS_VLAN_ARP(skb) \ | |
81 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
82 | vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
83 | brnf_filter_vlan_tagged) | |
1da177e4 | 84 | |
516299d2 MM |
85 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
86 | { | |
87 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
88 | sizeof(struct pppoe_hdr))); | |
89 | } | |
90 | ||
91 | #define IS_PPPOE_IP(skb) \ | |
92 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
93 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
94 | brnf_filter_pppoe_tagged) | |
95 | ||
96 | #define IS_PPPOE_IPV6(skb) \ | |
97 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
98 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
99 | brnf_filter_pppoe_tagged) | |
100 | ||
631339f1 HX |
101 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
102 | { | |
103 | } | |
104 | ||
105 | static struct dst_ops fake_dst_ops = { | |
106 | .family = AF_INET, | |
09640e63 | 107 | .protocol = cpu_to_be16(ETH_P_IP), |
631339f1 | 108 | .update_pmtu = fake_update_pmtu, |
631339f1 HX |
109 | .entries = ATOMIC_INIT(0), |
110 | }; | |
111 | ||
4adf0af6 SW |
112 | /* |
113 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
114 | * Currently, we fill in the PMTU entry because netfilter |
115 | * refragmentation needs it, and the rt_flags entry because | |
116 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
117 | * require us to fill additional fields. |
118 | */ | |
119 | void br_netfilter_rtable_init(struct net_bridge *br) | |
120 | { | |
121 | struct rtable *rt = &br->fake_rtable; | |
122 | ||
d8d1f30b CG |
123 | atomic_set(&rt->dst.__refcnt, 1); |
124 | rt->dst.dev = br->dev; | |
125 | rt->dst.path = &rt->dst; | |
126 | rt->dst.metrics[RTAX_MTU - 1] = 1500; | |
127 | rt->dst.flags = DST_NOXFRM; | |
128 | rt->dst.ops = &fake_dst_ops; | |
4adf0af6 SW |
129 | } |
130 | ||
131 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
132 | { | |
f350a0a8 JP |
133 | if (!br_port_exists(dev)) |
134 | return NULL; | |
135 | return &br_port_get_rcu(dev)->br->fake_rtable; | |
4adf0af6 | 136 | } |
1da177e4 | 137 | |
5dce971a SH |
138 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
139 | { | |
f350a0a8 JP |
140 | if (!br_port_exists(dev)) |
141 | return NULL; | |
5dce971a | 142 | |
f350a0a8 | 143 | return br_port_get_rcu(dev)->br->dev; |
5dce971a | 144 | } |
1da177e4 | 145 | |
fdeabdef SH |
146 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
147 | { | |
148 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
149 | if (likely(skb->nf_bridge)) | |
150 | atomic_set(&(skb->nf_bridge->use), 1); | |
151 | ||
152 | return skb->nf_bridge; | |
153 | } | |
154 | ||
2dc2f207 PM |
155 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
156 | { | |
157 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
158 | ||
159 | if (atomic_read(&nf_bridge->use) > 1) { | |
160 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
161 | ||
162 | if (tmp) { | |
163 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
164 | atomic_set(&tmp->use, 1); | |
165 | nf_bridge_put(nf_bridge); | |
166 | } | |
167 | nf_bridge = tmp; | |
168 | } | |
169 | return nf_bridge; | |
170 | } | |
171 | ||
fc38582d PM |
172 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
173 | { | |
174 | unsigned int len = nf_bridge_encap_header_len(skb); | |
175 | ||
176 | skb_push(skb, len); | |
177 | skb->network_header -= len; | |
178 | } | |
179 | ||
180 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 181 | { |
fc38582d PM |
182 | unsigned int len = nf_bridge_encap_header_len(skb); |
183 | ||
184 | skb_pull(skb, len); | |
185 | skb->network_header += len; | |
186 | } | |
fdeabdef | 187 | |
fc38582d PM |
188 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
189 | { | |
190 | unsigned int len = nf_bridge_encap_header_len(skb); | |
191 | ||
192 | skb_pull_rcsum(skb, len); | |
193 | skb->network_header += len; | |
194 | } | |
195 | ||
196 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
197 | { | |
198 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 199 | |
d626f62b ACM |
200 | skb_copy_from_linear_data_offset(skb, -header_size, |
201 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
202 | } |
203 | ||
e179e632 BDS |
204 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
205 | { | |
206 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
207 | skb->protocol = htons(ETH_P_8021Q); | |
208 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
209 | skb->protocol = htons(ETH_P_PPP_SES); | |
210 | } | |
211 | ||
212 | /* Fill in the header for fragmented IP packets handled by | |
213 | * the IPv4 connection tracking code. | |
07317621 SH |
214 | */ |
215 | int nf_bridge_copy_header(struct sk_buff *skb) | |
216 | { | |
217 | int err; | |
e179e632 | 218 | unsigned int header_size; |
07317621 | 219 | |
e179e632 BDS |
220 | nf_bridge_update_protocol(skb); |
221 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 222 | err = skb_cow_head(skb, header_size); |
07317621 SH |
223 | if (err) |
224 | return err; | |
225 | ||
27d7ff46 ACM |
226 | skb_copy_to_linear_data_offset(skb, -header_size, |
227 | skb->nf_bridge->data, header_size); | |
fc38582d | 228 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
229 | return 0; |
230 | } | |
231 | ||
1da177e4 LT |
232 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
233 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
234 | * bridge PRE_ROUTING hook. */ | |
235 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
236 | { | |
237 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 238 | struct rtable *rt; |
1da177e4 | 239 | |
1da177e4 LT |
240 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
241 | skb->pkt_type = PACKET_OTHERHOST; | |
242 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
243 | } | |
244 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
245 | ||
511c3f92 ED |
246 | rt = bridge_parent_rtable(nf_bridge->physindev); |
247 | if (!rt) { | |
4adf0af6 SW |
248 | kfree_skb(skb); |
249 | return 0; | |
250 | } | |
f9181f4f | 251 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
252 | |
253 | skb->dev = nf_bridge->physindev; | |
e179e632 | 254 | nf_bridge_update_protocol(skb); |
fc38582d | 255 | nf_bridge_push_encap_header(skb); |
713aefa3 | 256 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
257 | br_handle_frame_finish, 1); |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
e179e632 BDS |
262 | /* Obtain the correct destination MAC address, while preserving the original |
263 | * source MAC address. If we already know this address, we just copy it. If we | |
264 | * don't, we use the neighbour framework to find out. In both cases, we make | |
265 | * sure that br_handle_frame_finish() is called afterwards. | |
266 | */ | |
267 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
268 | { | |
269 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
270 | struct dst_entry *dst; | |
271 | ||
272 | skb->dev = bridge_parent(skb->dev); | |
273 | if (!skb->dev) | |
274 | goto free_skb; | |
275 | dst = skb_dst(skb); | |
276 | if (dst->hh) { | |
277 | neigh_hh_bridge(dst->hh, skb); | |
278 | skb->dev = nf_bridge->physindev; | |
279 | return br_handle_frame_finish(skb); | |
280 | } else if (dst->neighbour) { | |
281 | /* the neighbour function below overwrites the complete | |
282 | * MAC header, so we save the Ethernet source address and | |
283 | * protocol number. */ | |
284 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
285 | /* tell br_dev_xmit to continue with forwarding */ | |
286 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
287 | return dst->neighbour->output(skb); | |
288 | } | |
289 | free_skb: | |
290 | kfree_skb(skb); | |
291 | return 0; | |
292 | } | |
293 | ||
1da177e4 | 294 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 295 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
296 | * |
297 | * There are two cases to consider: | |
298 | * 1. The packet was DNAT'ed to a device in the same bridge | |
299 | * port group as it was received on. We can still bridge | |
300 | * the packet. | |
301 | * 2. The packet was DNAT'ed to a different device, either | |
302 | * a non-bridged device or another bridge port group. | |
303 | * The packet will need to be routed. | |
304 | * | |
305 | * The correct way of distinguishing between these two cases is to | |
306 | * call ip_route_input() and to look at skb->dst->dev, which is | |
307 | * changed to the destination device if ip_route_input() succeeds. | |
308 | * | |
ea2d9b41 | 309 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 310 | * |
ea2d9b41 BDS |
311 | * If the output device equals the logical bridge device the packet |
312 | * came in on, we can consider this bridging. The corresponding MAC | |
313 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
314 | * Otherwise, the packet is considered to be routed and we just |
315 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
316 | * later be passed up to the IP stack to be routed. For a redirected |
317 | * packet, ip_route_input() will give back the localhost as output device, | |
318 | * which differs from the bridge device. | |
1da177e4 | 319 | * |
ea2d9b41 | 320 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 321 | * |
f216f082 BDS |
322 | * This can be because the destination address is martian, in which case |
323 | * the packet will be dropped. | |
ea2d9b41 BDS |
324 | * If IP forwarding is disabled, ip_route_input() will fail, while |
325 | * ip_route_output_key() can return success. The source | |
326 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 327 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
328 | * if IP forwarding is enabled. If the output device equals the logical bridge |
329 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
330 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
331 | */ | |
1da177e4 LT |
332 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
333 | { | |
334 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 335 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 336 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 337 | struct rtable *rt; |
f216f082 | 338 | int err; |
1da177e4 | 339 | |
1da177e4 LT |
340 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
341 | skb->pkt_type = PACKET_OTHERHOST; | |
342 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
343 | } | |
344 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 345 | if (dnat_took_place(skb)) { |
f216f082 | 346 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
789bc3e5 SH |
347 | struct flowi fl = { |
348 | .nl_u = { | |
349 | .ip4_u = { | |
350 | .daddr = iph->daddr, | |
351 | .saddr = 0, | |
352 | .tos = RT_TOS(iph->tos) }, | |
353 | }, | |
354 | .proto = 0, | |
355 | }; | |
f3abc9b9 | 356 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
357 | |
358 | /* If err equals -EHOSTUNREACH the error is due to a | |
359 | * martian destination or due to the fact that | |
360 | * forwarding is disabled. For most martian packets, | |
361 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
362 | * martian destinations: loopback destinations and destination | |
363 | * 0.0.0.0. In both cases the packet will be dropped because the | |
364 | * destination is the loopback device and not the bridge. */ | |
365 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
366 | goto free_skb; | |
1da177e4 | 367 | |
249b6203 | 368 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
1c011bed | 369 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
370 | * require ip_forwarding. */ |
371 | if (((struct dst_entry *)rt)->dev == dev) { | |
adf30907 | 372 | skb_dst_set(skb, (struct dst_entry *)rt); |
1da177e4 LT |
373 | goto bridged_dnat; |
374 | } | |
1da177e4 LT |
375 | dst_release((struct dst_entry *)rt); |
376 | } | |
f216f082 | 377 | free_skb: |
1da177e4 LT |
378 | kfree_skb(skb); |
379 | return 0; | |
380 | } else { | |
adf30907 | 381 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 382 | bridged_dnat: |
1da177e4 | 383 | skb->dev = nf_bridge->physindev; |
e179e632 | 384 | nf_bridge_update_protocol(skb); |
fc38582d | 385 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
386 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
387 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
388 | skb, skb->dev, NULL, |
389 | br_nf_pre_routing_finish_bridge, | |
390 | 1); | |
391 | return 0; | |
392 | } | |
789bc3e5 | 393 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
394 | skb->pkt_type = PACKET_HOST; |
395 | } | |
396 | } else { | |
511c3f92 ED |
397 | rt = bridge_parent_rtable(nf_bridge->physindev); |
398 | if (!rt) { | |
4adf0af6 SW |
399 | kfree_skb(skb); |
400 | return 0; | |
401 | } | |
f9181f4f | 402 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
403 | } |
404 | ||
405 | skb->dev = nf_bridge->physindev; | |
e179e632 | 406 | nf_bridge_update_protocol(skb); |
fc38582d | 407 | nf_bridge_push_encap_header(skb); |
713aefa3 | 408 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
409 | br_handle_frame_finish, 1); |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 415 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
416 | { |
417 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
418 | ||
419 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
420 | skb->pkt_type = PACKET_HOST; | |
421 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
422 | } | |
423 | ||
424 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
425 | nf_bridge->physindev = skb->dev; | |
426 | skb->dev = bridge_parent(skb->dev); | |
e179e632 BDS |
427 | if (skb->protocol == htons(ETH_P_8021Q)) |
428 | nf_bridge->mask |= BRNF_8021Q; | |
429 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
430 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
431 | |
432 | return skb->dev; | |
1da177e4 LT |
433 | } |
434 | ||
435 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
436 | static int check_hbh_len(struct sk_buff *skb) | |
437 | { | |
0660e03f | 438 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 439 | u32 pkt_len; |
d56f90a7 ACM |
440 | const unsigned char *nh = skb_network_header(skb); |
441 | int off = raw - nh; | |
789bc3e5 | 442 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
443 | |
444 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
445 | goto bad; | |
446 | ||
447 | off += 2; | |
448 | len -= 2; | |
449 | ||
450 | while (len > 0) { | |
d56f90a7 | 451 | int optlen = nh[off + 1] + 2; |
1da177e4 | 452 | |
d56f90a7 | 453 | switch (nh[off]) { |
1da177e4 LT |
454 | case IPV6_TLV_PAD0: |
455 | optlen = 1; | |
456 | break; | |
457 | ||
458 | case IPV6_TLV_PADN: | |
459 | break; | |
460 | ||
461 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 462 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 463 | goto bad; |
d56f90a7 | 464 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 465 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 466 | ipv6_hdr(skb)->payload_len) |
b0366486 | 467 | goto bad; |
1da177e4 LT |
468 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
469 | goto bad; | |
b0366486 | 470 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 471 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 472 | goto bad; |
d56f90a7 | 473 | nh = skb_network_header(skb); |
1da177e4 LT |
474 | break; |
475 | default: | |
476 | if (optlen > len) | |
477 | goto bad; | |
478 | break; | |
479 | } | |
480 | off += optlen; | |
481 | len -= optlen; | |
482 | } | |
483 | if (len == 0) | |
484 | return 0; | |
485 | bad: | |
486 | return -1; | |
487 | ||
488 | } | |
489 | ||
490 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
491 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
492 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
493 | struct sk_buff *skb, |
494 | const struct net_device *in, | |
495 | const struct net_device *out, | |
496 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
497 | { |
498 | struct ipv6hdr *hdr; | |
499 | u32 pkt_len; | |
1da177e4 LT |
500 | |
501 | if (skb->len < sizeof(struct ipv6hdr)) | |
502 | goto inhdr_error; | |
503 | ||
504 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
505 | goto inhdr_error; | |
506 | ||
0660e03f | 507 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
508 | |
509 | if (hdr->version != 6) | |
510 | goto inhdr_error; | |
511 | ||
512 | pkt_len = ntohs(hdr->payload_len); | |
513 | ||
514 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
515 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
516 | goto inhdr_error; | |
b38dfee3 HX |
517 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
518 | goto inhdr_error; | |
1da177e4 LT |
519 | } |
520 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 521 | goto inhdr_error; |
1da177e4 | 522 | |
789bc3e5 | 523 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 524 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 525 | return NF_DROP; |
5dce971a SH |
526 | if (!setup_pre_routing(skb)) |
527 | return NF_DROP; | |
1da177e4 | 528 | |
e179e632 | 529 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 530 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
531 | br_nf_pre_routing_finish_ipv6); |
532 | ||
533 | return NF_STOLEN; | |
534 | ||
535 | inhdr_error: | |
536 | return NF_DROP; | |
537 | } | |
538 | ||
539 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
540 | * Replicate the checks that IPv4 does on packet reception. | |
541 | * Set skb->dev to the bridge device (i.e. parent of the | |
542 | * receiving device) to make netfilter happy, the REDIRECT | |
543 | * target in particular. Save the original destination IP | |
544 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 545 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
546 | const struct net_device *in, |
547 | const struct net_device *out, | |
548 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 549 | { |
4df53d8b PM |
550 | struct net_bridge_port *p; |
551 | struct net_bridge *br; | |
1da177e4 | 552 | struct iphdr *iph; |
e7c243c9 EP |
553 | __u32 len = nf_bridge_encap_header_len(skb); |
554 | ||
e7c243c9 EP |
555 | if (unlikely(!pskb_may_pull(skb, len))) |
556 | goto out; | |
1da177e4 | 557 | |
e490c1de | 558 | p = br_port_get_rcu(in); |
4df53d8b PM |
559 | if (p == NULL) |
560 | goto out; | |
561 | br = p->br; | |
562 | ||
516299d2 MM |
563 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
564 | IS_PPPOE_IPV6(skb)) { | |
4df53d8b | 565 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 566 | return NF_ACCEPT; |
4df53d8b | 567 | |
fc38582d | 568 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
569 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
570 | } | |
4df53d8b PM |
571 | |
572 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 573 | return NF_ACCEPT; |
1da177e4 | 574 | |
516299d2 MM |
575 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
576 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
577 | return NF_ACCEPT; |
578 | ||
fc38582d | 579 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
580 | |
581 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
582 | goto inhdr_error; | |
583 | ||
eddc9ec5 | 584 | iph = ip_hdr(skb); |
1da177e4 LT |
585 | if (iph->ihl < 5 || iph->version != 4) |
586 | goto inhdr_error; | |
587 | ||
789bc3e5 | 588 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
589 | goto inhdr_error; |
590 | ||
eddc9ec5 | 591 | iph = ip_hdr(skb); |
789bc3e5 | 592 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
593 | goto inhdr_error; |
594 | ||
595 | len = ntohs(iph->tot_len); | |
789bc3e5 | 596 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
597 | goto inhdr_error; |
598 | ||
b38dfee3 | 599 | pskb_trim_rcsum(skb, len); |
1da177e4 | 600 | |
17762060 HX |
601 | /* BUG: Should really parse the IP options here. */ |
602 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
603 | ||
789bc3e5 | 604 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 605 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 606 | return NF_DROP; |
5dce971a SH |
607 | if (!setup_pre_routing(skb)) |
608 | return NF_DROP; | |
1da177e4 | 609 | store_orig_dstaddr(skb); |
e179e632 | 610 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 611 | |
713aefa3 | 612 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
613 | br_nf_pre_routing_finish); |
614 | ||
615 | return NF_STOLEN; | |
616 | ||
617 | inhdr_error: | |
789bc3e5 | 618 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
619 | out: |
620 | return NF_DROP; | |
621 | } | |
622 | ||
623 | ||
624 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
625 | /* The packet is locally destined, which requires a real | |
626 | * dst_entry, so detach the fake one. On the way up, the | |
627 | * packet would pass through PRE_ROUTING again (which already | |
628 | * took place when the packet entered the bridge), but we | |
629 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
630 | * prevent this from happening. */ | |
3db05fea | 631 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
632 | const struct net_device *in, |
633 | const struct net_device *out, | |
634 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 635 | { |
511c3f92 ED |
636 | struct rtable *rt = skb_rtable(skb); |
637 | ||
adf30907 ED |
638 | if (rt && rt == bridge_parent_rtable(in)) |
639 | skb_dst_drop(skb); | |
1da177e4 LT |
640 | |
641 | return NF_ACCEPT; | |
642 | } | |
643 | ||
1da177e4 LT |
644 | /* PF_BRIDGE/FORWARD *************************************************/ |
645 | static int br_nf_forward_finish(struct sk_buff *skb) | |
646 | { | |
647 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
648 | struct net_device *in; | |
1da177e4 | 649 | |
8b42ec39 | 650 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
651 | in = nf_bridge->physindev; |
652 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
653 | skb->pkt_type = PACKET_OTHERHOST; | |
654 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
655 | } | |
e94c6743 | 656 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
657 | } else { |
658 | in = *((struct net_device **)(skb->cb)); | |
659 | } | |
fc38582d | 660 | nf_bridge_push_encap_header(skb); |
e179e632 | 661 | |
713aefa3 | 662 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 663 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
664 | return 0; |
665 | } | |
666 | ||
667 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
668 | * netfilter with indev and outdev set to the bridge device, | |
669 | * but we are still able to filter on the 'real' indev/outdev | |
670 | * because of the physdev module. For ARP, indev and outdev are the | |
671 | * bridge ports. */ | |
3db05fea | 672 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
673 | const struct net_device *in, |
674 | const struct net_device *out, | |
675 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 676 | { |
1da177e4 | 677 | struct nf_bridge_info *nf_bridge; |
5dce971a | 678 | struct net_device *parent; |
76108cea | 679 | u_int8_t pf; |
1da177e4 LT |
680 | |
681 | if (!skb->nf_bridge) | |
682 | return NF_ACCEPT; | |
683 | ||
2dc2f207 PM |
684 | /* Need exclusive nf_bridge_info since we might have multiple |
685 | * different physoutdevs. */ | |
686 | if (!nf_bridge_unshare(skb)) | |
687 | return NF_DROP; | |
688 | ||
5dce971a SH |
689 | parent = bridge_parent(out); |
690 | if (!parent) | |
691 | return NF_DROP; | |
692 | ||
516299d2 MM |
693 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
694 | IS_PPPOE_IP(skb)) | |
1da177e4 | 695 | pf = PF_INET; |
a2bd40ad HX |
696 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
697 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 698 | pf = PF_INET6; |
a2bd40ad HX |
699 | else |
700 | return NF_ACCEPT; | |
1da177e4 | 701 | |
3db05fea | 702 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 703 | |
1da177e4 LT |
704 | nf_bridge = skb->nf_bridge; |
705 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
706 | skb->pkt_type = PACKET_HOST; | |
707 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
708 | } | |
709 | ||
710 | /* The physdev module checks on this */ | |
711 | nf_bridge->mask |= BRNF_BRIDGED; | |
712 | nf_bridge->physoutdev = skb->dev; | |
e179e632 BDS |
713 | if (pf == PF_INET) |
714 | skb->protocol = htons(ETH_P_IP); | |
715 | else | |
716 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 717 | |
6e23ae2a | 718 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 719 | br_nf_forward_finish); |
1da177e4 LT |
720 | |
721 | return NF_STOLEN; | |
722 | } | |
723 | ||
3db05fea | 724 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
725 | const struct net_device *in, |
726 | const struct net_device *out, | |
727 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 728 | { |
4df53d8b PM |
729 | struct net_bridge_port *p; |
730 | struct net_bridge *br; | |
1da177e4 LT |
731 | struct net_device **d = (struct net_device **)(skb->cb); |
732 | ||
e490c1de | 733 | p = br_port_get_rcu(out); |
4df53d8b PM |
734 | if (p == NULL) |
735 | return NF_ACCEPT; | |
736 | br = p->br; | |
737 | ||
738 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 739 | return NF_ACCEPT; |
1da177e4 | 740 | |
f8a26028 | 741 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 742 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 743 | return NF_ACCEPT; |
3db05fea | 744 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
745 | } |
746 | ||
d0a92be0 | 747 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 748 | if (IS_VLAN_ARP(skb)) |
3db05fea | 749 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
750 | return NF_ACCEPT; |
751 | } | |
752 | *d = (struct net_device *)in; | |
fdc9314c | 753 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
754 | (struct net_device *)out, br_nf_forward_finish); |
755 | ||
756 | return NF_STOLEN; | |
757 | } | |
758 | ||
c197facc | 759 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
2e2f7aef PM |
760 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
761 | { | |
e179e632 | 762 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 763 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
89114afd | 764 | !skb_is_gso(skb)) |
2e2f7aef PM |
765 | return ip_fragment(skb, br_dev_queue_push_xmit); |
766 | else | |
767 | return br_dev_queue_push_xmit(skb); | |
768 | } | |
c197facc | 769 | #else |
770 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
771 | { | |
772 | return br_dev_queue_push_xmit(skb); | |
773 | } | |
774 | #endif | |
1da177e4 LT |
775 | |
776 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 777 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
778 | const struct net_device *in, |
779 | const struct net_device *out, | |
780 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 781 | { |
3db05fea | 782 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 783 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 784 | u_int8_t pf; |
1da177e4 | 785 | |
ea2d9b41 | 786 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
787 | return NF_ACCEPT; |
788 | ||
5dce971a SH |
789 | if (!realoutdev) |
790 | return NF_DROP; | |
791 | ||
516299d2 MM |
792 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
793 | IS_PPPOE_IP(skb)) | |
1da177e4 | 794 | pf = PF_INET; |
a2bd40ad HX |
795 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
796 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 797 | pf = PF_INET6; |
a2bd40ad HX |
798 | else |
799 | return NF_ACCEPT; | |
1da177e4 | 800 | |
1da177e4 LT |
801 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
802 | * about the value of skb->pkt_type. */ | |
803 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
804 | skb->pkt_type = PACKET_HOST; | |
805 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
806 | } | |
807 | ||
fc38582d | 808 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 809 | nf_bridge_save_header(skb); |
e179e632 BDS |
810 | if (pf == PF_INET) |
811 | skb->protocol = htons(ETH_P_IP); | |
812 | else | |
813 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 814 | |
6e23ae2a | 815 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 816 | br_nf_dev_queue_xmit); |
1da177e4 LT |
817 | |
818 | return NF_STOLEN; | |
1da177e4 LT |
819 | } |
820 | ||
1da177e4 LT |
821 | /* IP/SABOTAGE *****************************************************/ |
822 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
823 | * for the second time. */ | |
3db05fea | 824 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
825 | const struct net_device *in, |
826 | const struct net_device *out, | |
827 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 828 | { |
3db05fea HX |
829 | if (skb->nf_bridge && |
830 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
831 | return NF_STOP; |
832 | } | |
833 | ||
834 | return NF_ACCEPT; | |
835 | } | |
836 | ||
ea2d9b41 BDS |
837 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
838 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 839 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
840 | { |
841 | .hook = br_nf_pre_routing, | |
842 | .owner = THIS_MODULE, | |
843 | .pf = PF_BRIDGE, | |
844 | .hooknum = NF_BR_PRE_ROUTING, | |
845 | .priority = NF_BR_PRI_BRNF, | |
846 | }, | |
847 | { | |
848 | .hook = br_nf_local_in, | |
849 | .owner = THIS_MODULE, | |
850 | .pf = PF_BRIDGE, | |
851 | .hooknum = NF_BR_LOCAL_IN, | |
852 | .priority = NF_BR_PRI_BRNF, | |
853 | }, | |
854 | { | |
855 | .hook = br_nf_forward_ip, | |
856 | .owner = THIS_MODULE, | |
857 | .pf = PF_BRIDGE, | |
858 | .hooknum = NF_BR_FORWARD, | |
859 | .priority = NF_BR_PRI_BRNF - 1, | |
860 | }, | |
861 | { | |
862 | .hook = br_nf_forward_arp, | |
863 | .owner = THIS_MODULE, | |
864 | .pf = PF_BRIDGE, | |
865 | .hooknum = NF_BR_FORWARD, | |
866 | .priority = NF_BR_PRI_BRNF, | |
867 | }, | |
1490fd89 CG |
868 | { |
869 | .hook = br_nf_post_routing, | |
870 | .owner = THIS_MODULE, | |
871 | .pf = PF_BRIDGE, | |
872 | .hooknum = NF_BR_POST_ROUTING, | |
873 | .priority = NF_BR_PRI_LAST, | |
874 | }, | |
875 | { | |
876 | .hook = ip_sabotage_in, | |
877 | .owner = THIS_MODULE, | |
878 | .pf = PF_INET, | |
879 | .hooknum = NF_INET_PRE_ROUTING, | |
880 | .priority = NF_IP_PRI_FIRST, | |
881 | }, | |
882 | { | |
883 | .hook = ip_sabotage_in, | |
884 | .owner = THIS_MODULE, | |
885 | .pf = PF_INET6, | |
886 | .hooknum = NF_INET_PRE_ROUTING, | |
887 | .priority = NF_IP6_PRI_FIRST, | |
888 | }, | |
1da177e4 LT |
889 | }; |
890 | ||
891 | #ifdef CONFIG_SYSCTL | |
892 | static | |
8d65af78 | 893 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 894 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
895 | { |
896 | int ret; | |
897 | ||
8d65af78 | 898 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
899 | |
900 | if (write && *(int *)(ctl->data)) | |
901 | *(int *)(ctl->data) = 1; | |
902 | return ret; | |
903 | } | |
904 | ||
905 | static ctl_table brnf_table[] = { | |
906 | { | |
1da177e4 LT |
907 | .procname = "bridge-nf-call-arptables", |
908 | .data = &brnf_call_arptables, | |
909 | .maxlen = sizeof(int), | |
910 | .mode = 0644, | |
6d9f239a | 911 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
912 | }, |
913 | { | |
1da177e4 LT |
914 | .procname = "bridge-nf-call-iptables", |
915 | .data = &brnf_call_iptables, | |
916 | .maxlen = sizeof(int), | |
917 | .mode = 0644, | |
6d9f239a | 918 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
919 | }, |
920 | { | |
1da177e4 LT |
921 | .procname = "bridge-nf-call-ip6tables", |
922 | .data = &brnf_call_ip6tables, | |
923 | .maxlen = sizeof(int), | |
924 | .mode = 0644, | |
6d9f239a | 925 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
926 | }, |
927 | { | |
1da177e4 LT |
928 | .procname = "bridge-nf-filter-vlan-tagged", |
929 | .data = &brnf_filter_vlan_tagged, | |
930 | .maxlen = sizeof(int), | |
931 | .mode = 0644, | |
6d9f239a | 932 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
933 | }, |
934 | { | |
516299d2 MM |
935 | .procname = "bridge-nf-filter-pppoe-tagged", |
936 | .data = &brnf_filter_pppoe_tagged, | |
937 | .maxlen = sizeof(int), | |
938 | .mode = 0644, | |
6d9f239a | 939 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 940 | }, |
f8572d8f | 941 | { } |
1da177e4 LT |
942 | }; |
943 | ||
b5ccd792 | 944 | static struct ctl_path brnf_path[] = { |
f8572d8f EB |
945 | { .procname = "net", }, |
946 | { .procname = "bridge", }, | |
b5ccd792 | 947 | { } |
1da177e4 LT |
948 | }; |
949 | #endif | |
950 | ||
5eb87f45 | 951 | int __init br_netfilter_init(void) |
1da177e4 | 952 | { |
5eb87f45 | 953 | int ret; |
1da177e4 | 954 | |
5eb87f45 PM |
955 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
956 | if (ret < 0) | |
1da177e4 | 957 | return ret; |
1da177e4 | 958 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 959 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 960 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
961 | printk(KERN_WARNING |
962 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 PM |
963 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
964 | return -ENOMEM; | |
1da177e4 LT |
965 | } |
966 | #endif | |
1da177e4 | 967 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
968 | return 0; |
969 | } | |
970 | ||
971 | void br_netfilter_fini(void) | |
972 | { | |
5eb87f45 | 973 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
974 | #ifdef CONFIG_SYSCTL |
975 | unregister_sysctl_table(brnf_sysctl_header); | |
976 | #endif | |
977 | } |