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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 | 37 | #include <net/route.h> |
56768644 | 38 | #include <net/netfilter/br_netfilter.h> |
14c85021 | 39 | |
1da177e4 | 40 | #include <asm/uaccess.h> |
1da177e4 LT |
41 | #include "br_private.h" |
42 | #ifdef CONFIG_SYSCTL | |
43 | #include <linux/sysctl.h> | |
44 | #endif | |
45 | ||
46 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
47 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
48 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
49 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 50 | |
1da177e4 LT |
51 | #ifdef CONFIG_SYSCTL |
52 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
53 | static int brnf_call_iptables __read_mostly = 1; |
54 | static int brnf_call_ip6tables __read_mostly = 1; | |
55 | static int brnf_call_arptables __read_mostly = 1; | |
47e0e1ca HX |
56 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
57 | static int brnf_filter_pppoe_tagged __read_mostly = 0; | |
4981682c | 58 | static int brnf_pass_vlan_indev __read_mostly = 0; |
1da177e4 | 59 | #else |
4df53d8b PM |
60 | #define brnf_call_iptables 1 |
61 | #define brnf_call_ip6tables 1 | |
62 | #define brnf_call_arptables 1 | |
47e0e1ca HX |
63 | #define brnf_filter_vlan_tagged 0 |
64 | #define brnf_filter_pppoe_tagged 0 | |
4981682c | 65 | #define brnf_pass_vlan_indev 0 |
1da177e4 LT |
66 | #endif |
67 | ||
739e4505 | 68 | #define IS_IP(skb) \ |
df8a39de | 69 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) |
739e4505 FW |
70 | |
71 | #define IS_IPV6(skb) \ | |
df8a39de | 72 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) |
739e4505 FW |
73 | |
74 | #define IS_ARP(skb) \ | |
df8a39de | 75 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) |
739e4505 | 76 | |
b6f99a21 | 77 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 | 78 | { |
df8a39de | 79 | if (skb_vlan_tag_present(skb)) |
13937911 JG |
80 | return skb->protocol; |
81 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
82 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
83 | else | |
84 | return 0; | |
8b42ec39 SH |
85 | } |
86 | ||
87 | #define IS_VLAN_IP(skb) \ | |
13937911 | 88 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
89 | brnf_filter_vlan_tagged) |
90 | ||
91 | #define IS_VLAN_IPV6(skb) \ | |
13937911 | 92 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
8b42ec39 SH |
93 | brnf_filter_vlan_tagged) |
94 | ||
95 | #define IS_VLAN_ARP(skb) \ | |
13937911 | 96 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
8b42ec39 | 97 | brnf_filter_vlan_tagged) |
1da177e4 | 98 | |
516299d2 MM |
99 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
100 | { | |
101 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
102 | sizeof(struct pppoe_hdr))); | |
103 | } | |
104 | ||
105 | #define IS_PPPOE_IP(skb) \ | |
106 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
107 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
108 | brnf_filter_pppoe_tagged) | |
109 | ||
110 | #define IS_PPPOE_IPV6(skb) \ | |
111 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
112 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
113 | brnf_filter_pppoe_tagged) | |
114 | ||
4adf0af6 SW |
115 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) |
116 | { | |
b5ed54e9 | 117 | struct net_bridge_port *port; |
118 | ||
119 | port = br_port_get_rcu(dev); | |
120 | return port ? &port->br->fake_rtable : NULL; | |
4adf0af6 | 121 | } |
1da177e4 | 122 | |
5dce971a SH |
123 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
124 | { | |
b5ed54e9 | 125 | struct net_bridge_port *port; |
5dce971a | 126 | |
b5ed54e9 | 127 | port = br_port_get_rcu(dev); |
128 | return port ? port->br->dev : NULL; | |
5dce971a | 129 | } |
1da177e4 | 130 | |
fdeabdef SH |
131 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
132 | { | |
133 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
134 | if (likely(skb->nf_bridge)) | |
135 | atomic_set(&(skb->nf_bridge->use), 1); | |
136 | ||
137 | return skb->nf_bridge; | |
138 | } | |
139 | ||
2dc2f207 PM |
140 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
141 | { | |
142 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
143 | ||
144 | if (atomic_read(&nf_bridge->use) > 1) { | |
145 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
146 | ||
147 | if (tmp) { | |
148 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
149 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 150 | } |
4c3a76ab | 151 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
152 | nf_bridge = tmp; |
153 | } | |
154 | return nf_bridge; | |
155 | } | |
156 | ||
fc38582d PM |
157 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
158 | { | |
159 | unsigned int len = nf_bridge_encap_header_len(skb); | |
160 | ||
161 | skb_push(skb, len); | |
162 | skb->network_header -= len; | |
163 | } | |
164 | ||
165 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 166 | { |
fc38582d PM |
167 | unsigned int len = nf_bridge_encap_header_len(skb); |
168 | ||
169 | skb_pull(skb, len); | |
170 | skb->network_header += len; | |
171 | } | |
fdeabdef | 172 | |
fc38582d PM |
173 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
174 | { | |
175 | unsigned int len = nf_bridge_encap_header_len(skb); | |
176 | ||
177 | skb_pull_rcsum(skb, len); | |
178 | skb->network_header += len; | |
179 | } | |
180 | ||
181 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
182 | { | |
183 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 184 | |
d626f62b ACM |
185 | skb_copy_from_linear_data_offset(skb, -header_size, |
186 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
187 | } |
188 | ||
462fb2af BD |
189 | /* When handing a packet over to the IP layer |
190 | * check whether we have a skb that is in the | |
191 | * expected format | |
192 | */ | |
193 | ||
d0280232 | 194 | static int br_parse_ip_options(struct sk_buff *skb) |
462fb2af | 195 | { |
b71d1d42 | 196 | const struct iphdr *iph; |
462fb2af BD |
197 | struct net_device *dev = skb->dev; |
198 | u32 len; | |
199 | ||
6caab7b0 SB |
200 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
201 | goto inhdr_error; | |
202 | ||
462fb2af | 203 | iph = ip_hdr(skb); |
462fb2af BD |
204 | |
205 | /* Basic sanity checks */ | |
206 | if (iph->ihl < 5 || iph->version != 4) | |
207 | goto inhdr_error; | |
208 | ||
209 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
210 | goto inhdr_error; | |
211 | ||
212 | iph = ip_hdr(skb); | |
213 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
214 | goto inhdr_error; | |
215 | ||
216 | len = ntohs(iph->tot_len); | |
217 | if (skb->len < len) { | |
218 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
219 | goto drop; | |
220 | } else if (len < (iph->ihl*4)) | |
221 | goto inhdr_error; | |
222 | ||
223 | if (pskb_trim_rcsum(skb, len)) { | |
224 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
225 | goto drop; | |
226 | } | |
227 | ||
f8e9881c | 228 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
7677e868 HX |
229 | /* We should really parse IP options here but until |
230 | * somebody who actually uses IP options complains to | |
231 | * us we'll just silently ignore the options because | |
232 | * we're lazy! | |
233 | */ | |
462fb2af BD |
234 | return 0; |
235 | ||
236 | inhdr_error: | |
237 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
238 | drop: | |
239 | return -1; | |
240 | } | |
241 | ||
1da177e4 LT |
242 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
243 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
244 | * bridge PRE_ROUTING hook. */ | |
245 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
246 | { | |
247 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 248 | struct rtable *rt; |
1da177e4 | 249 | |
1da177e4 LT |
250 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
251 | skb->pkt_type = PACKET_OTHERHOST; | |
252 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
253 | } | |
254 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
255 | ||
511c3f92 ED |
256 | rt = bridge_parent_rtable(nf_bridge->physindev); |
257 | if (!rt) { | |
4adf0af6 SW |
258 | kfree_skb(skb); |
259 | return 0; | |
260 | } | |
f9181f4f | 261 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
262 | |
263 | skb->dev = nf_bridge->physindev; | |
e179e632 | 264 | nf_bridge_update_protocol(skb); |
fc38582d | 265 | nf_bridge_push_encap_header(skb); |
713aefa3 | 266 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
267 | br_handle_frame_finish, 1); |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
e179e632 BDS |
272 | /* Obtain the correct destination MAC address, while preserving the original |
273 | * source MAC address. If we already know this address, we just copy it. If we | |
274 | * don't, we use the neighbour framework to find out. In both cases, we make | |
275 | * sure that br_handle_frame_finish() is called afterwards. | |
276 | */ | |
277 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
278 | { | |
279 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
f6b72b62 | 280 | struct neighbour *neigh; |
e179e632 BDS |
281 | struct dst_entry *dst; |
282 | ||
283 | skb->dev = bridge_parent(skb->dev); | |
284 | if (!skb->dev) | |
285 | goto free_skb; | |
286 | dst = skb_dst(skb); | |
f9d75166 DM |
287 | neigh = dst_neigh_lookup_skb(dst, skb); |
288 | if (neigh) { | |
289 | int ret; | |
290 | ||
291 | if (neigh->hh.hh_len) { | |
292 | neigh_hh_bridge(&neigh->hh, skb); | |
293 | skb->dev = nf_bridge->physindev; | |
294 | ret = br_handle_frame_finish(skb); | |
295 | } else { | |
296 | /* the neighbour function below overwrites the complete | |
297 | * MAC header, so we save the Ethernet source address and | |
298 | * protocol number. | |
299 | */ | |
300 | skb_copy_from_linear_data_offset(skb, | |
301 | -(ETH_HLEN-ETH_ALEN), | |
302 | skb->nf_bridge->data, | |
303 | ETH_HLEN-ETH_ALEN); | |
304 | /* tell br_dev_xmit to continue with forwarding */ | |
305 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
93fdd47e | 306 | /* FIXME Need to refragment */ |
f9d75166 DM |
307 | ret = neigh->output(neigh, skb); |
308 | } | |
309 | neigh_release(neigh); | |
310 | return ret; | |
e179e632 BDS |
311 | } |
312 | free_skb: | |
313 | kfree_skb(skb); | |
314 | return 0; | |
315 | } | |
316 | ||
1da177e4 | 317 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 318 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
319 | * |
320 | * There are two cases to consider: | |
321 | * 1. The packet was DNAT'ed to a device in the same bridge | |
322 | * port group as it was received on. We can still bridge | |
323 | * the packet. | |
324 | * 2. The packet was DNAT'ed to a different device, either | |
325 | * a non-bridged device or another bridge port group. | |
326 | * The packet will need to be routed. | |
327 | * | |
328 | * The correct way of distinguishing between these two cases is to | |
329 | * call ip_route_input() and to look at skb->dst->dev, which is | |
330 | * changed to the destination device if ip_route_input() succeeds. | |
331 | * | |
ea2d9b41 | 332 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 333 | * |
ea2d9b41 BDS |
334 | * If the output device equals the logical bridge device the packet |
335 | * came in on, we can consider this bridging. The corresponding MAC | |
336 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
337 | * Otherwise, the packet is considered to be routed and we just |
338 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
339 | * later be passed up to the IP stack to be routed. For a redirected |
340 | * packet, ip_route_input() will give back the localhost as output device, | |
341 | * which differs from the bridge device. | |
1da177e4 | 342 | * |
ea2d9b41 | 343 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 344 | * |
f216f082 BDS |
345 | * This can be because the destination address is martian, in which case |
346 | * the packet will be dropped. | |
ea2d9b41 BDS |
347 | * If IP forwarding is disabled, ip_route_input() will fail, while |
348 | * ip_route_output_key() can return success. The source | |
349 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 350 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
351 | * if IP forwarding is enabled. If the output device equals the logical bridge |
352 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
353 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
354 | */ | |
1da177e4 LT |
355 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
356 | { | |
357 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 358 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 359 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 360 | struct rtable *rt; |
f216f082 | 361 | int err; |
93fdd47e HX |
362 | int frag_max_size; |
363 | ||
364 | frag_max_size = IPCB(skb)->frag_max_size; | |
365 | BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size; | |
1da177e4 | 366 | |
1da177e4 LT |
367 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
368 | skb->pkt_type = PACKET_OTHERHOST; | |
369 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
370 | } | |
371 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 372 | if (dnat_took_place(skb)) { |
f216f082 | 373 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 374 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
375 | |
376 | /* If err equals -EHOSTUNREACH the error is due to a | |
377 | * martian destination or due to the fact that | |
378 | * forwarding is disabled. For most martian packets, | |
379 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
380 | * martian destinations: loopback destinations and destination | |
381 | * 0.0.0.0. In both cases the packet will be dropped because the | |
382 | * destination is the loopback device and not the bridge. */ | |
383 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
384 | goto free_skb; | |
1da177e4 | 385 | |
78fbfd8a DM |
386 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
387 | RT_TOS(iph->tos), 0); | |
b23dd4fe | 388 | if (!IS_ERR(rt)) { |
1c011bed | 389 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 390 | * require ip_forwarding. */ |
b23dd4fe DM |
391 | if (rt->dst.dev == dev) { |
392 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
393 | goto bridged_dnat; |
394 | } | |
b23dd4fe | 395 | ip_rt_put(rt); |
1da177e4 | 396 | } |
f216f082 | 397 | free_skb: |
1da177e4 LT |
398 | kfree_skb(skb); |
399 | return 0; | |
400 | } else { | |
adf30907 | 401 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 402 | bridged_dnat: |
1da177e4 | 403 | skb->dev = nf_bridge->physindev; |
e179e632 | 404 | nf_bridge_update_protocol(skb); |
fc38582d | 405 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
406 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
407 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
408 | skb, skb->dev, NULL, |
409 | br_nf_pre_routing_finish_bridge, | |
410 | 1); | |
411 | return 0; | |
412 | } | |
04091142 | 413 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
1da177e4 LT |
414 | skb->pkt_type = PACKET_HOST; |
415 | } | |
416 | } else { | |
511c3f92 ED |
417 | rt = bridge_parent_rtable(nf_bridge->physindev); |
418 | if (!rt) { | |
4adf0af6 SW |
419 | kfree_skb(skb); |
420 | return 0; | |
421 | } | |
f9181f4f | 422 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
423 | } |
424 | ||
425 | skb->dev = nf_bridge->physindev; | |
e179e632 | 426 | nf_bridge_update_protocol(skb); |
fc38582d | 427 | nf_bridge_push_encap_header(skb); |
713aefa3 | 428 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
429 | br_handle_frame_finish, 1); |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
4981682c PNA |
434 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
435 | { | |
436 | struct net_device *vlan, *br; | |
437 | ||
438 | br = bridge_parent(dev); | |
df8a39de | 439 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) |
4981682c PNA |
440 | return br; |
441 | ||
f06c7f9f | 442 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
df8a39de | 443 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); |
4981682c PNA |
444 | |
445 | return vlan ? vlan : br; | |
446 | } | |
447 | ||
1da177e4 | 448 | /* Some common code for IPv4/IPv6 */ |
5dce971a | 449 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
450 | { |
451 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
452 | ||
453 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
454 | skb->pkt_type = PACKET_HOST; | |
455 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
456 | } | |
457 | ||
458 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
459 | nf_bridge->physindev = skb->dev; | |
4981682c | 460 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
e179e632 BDS |
461 | if (skb->protocol == htons(ETH_P_8021Q)) |
462 | nf_bridge->mask |= BRNF_8021Q; | |
463 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
464 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a | 465 | |
6b8dbcf2 FW |
466 | /* Must drop socket now because of tproxy. */ |
467 | skb_orphan(skb); | |
5dce971a | 468 | return skb->dev; |
1da177e4 LT |
469 | } |
470 | ||
471 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
472 | static int check_hbh_len(struct sk_buff *skb) | |
473 | { | |
0660e03f | 474 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 475 | u32 pkt_len; |
d56f90a7 ACM |
476 | const unsigned char *nh = skb_network_header(skb); |
477 | int off = raw - nh; | |
789bc3e5 | 478 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
479 | |
480 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
481 | goto bad; | |
482 | ||
483 | off += 2; | |
484 | len -= 2; | |
485 | ||
486 | while (len > 0) { | |
d56f90a7 | 487 | int optlen = nh[off + 1] + 2; |
1da177e4 | 488 | |
d56f90a7 | 489 | switch (nh[off]) { |
1de5a71c | 490 | case IPV6_TLV_PAD1: |
1da177e4 LT |
491 | optlen = 1; |
492 | break; | |
493 | ||
494 | case IPV6_TLV_PADN: | |
495 | break; | |
496 | ||
497 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 498 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 499 | goto bad; |
d56f90a7 | 500 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 501 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 502 | ipv6_hdr(skb)->payload_len) |
b0366486 | 503 | goto bad; |
1da177e4 LT |
504 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
505 | goto bad; | |
b0366486 | 506 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 507 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 508 | goto bad; |
d56f90a7 | 509 | nh = skb_network_header(skb); |
1da177e4 LT |
510 | break; |
511 | default: | |
512 | if (optlen > len) | |
513 | goto bad; | |
514 | break; | |
515 | } | |
516 | off += optlen; | |
517 | len -= optlen; | |
518 | } | |
519 | if (len == 0) | |
520 | return 0; | |
521 | bad: | |
522 | return -1; | |
523 | ||
524 | } | |
525 | ||
526 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
527 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
795aa6ef | 528 | static unsigned int br_nf_pre_routing_ipv6(const struct nf_hook_ops *ops, |
789bc3e5 SH |
529 | struct sk_buff *skb, |
530 | const struct net_device *in, | |
531 | const struct net_device *out, | |
532 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 533 | { |
b71d1d42 | 534 | const struct ipv6hdr *hdr; |
1da177e4 | 535 | u32 pkt_len; |
1da177e4 LT |
536 | |
537 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 538 | return NF_DROP; |
1da177e4 LT |
539 | |
540 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 541 | return NF_DROP; |
1da177e4 | 542 | |
0660e03f | 543 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
544 | |
545 | if (hdr->version != 6) | |
deef4b52 | 546 | return NF_DROP; |
1da177e4 LT |
547 | |
548 | pkt_len = ntohs(hdr->payload_len); | |
549 | ||
550 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
551 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 552 | return NF_DROP; |
b38dfee3 | 553 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 554 | return NF_DROP; |
1da177e4 LT |
555 | } |
556 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 557 | return NF_DROP; |
1da177e4 | 558 | |
789bc3e5 | 559 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 560 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 561 | return NF_DROP; |
5dce971a SH |
562 | if (!setup_pre_routing(skb)) |
563 | return NF_DROP; | |
1da177e4 | 564 | |
e179e632 | 565 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 566 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
567 | br_nf_pre_routing_finish_ipv6); |
568 | ||
569 | return NF_STOLEN; | |
1da177e4 LT |
570 | } |
571 | ||
572 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
573 | * Replicate the checks that IPv4 does on packet reception. | |
574 | * Set skb->dev to the bridge device (i.e. parent of the | |
575 | * receiving device) to make netfilter happy, the REDIRECT | |
576 | * target in particular. Save the original destination IP | |
577 | * address to be able to detect DNAT afterwards. */ | |
795aa6ef PM |
578 | static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops, |
579 | struct sk_buff *skb, | |
ee02b3a6 SH |
580 | const struct net_device *in, |
581 | const struct net_device *out, | |
582 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 583 | { |
4df53d8b PM |
584 | struct net_bridge_port *p; |
585 | struct net_bridge *br; | |
e7c243c9 EP |
586 | __u32 len = nf_bridge_encap_header_len(skb); |
587 | ||
e7c243c9 | 588 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 589 | return NF_DROP; |
1da177e4 | 590 | |
e490c1de | 591 | p = br_port_get_rcu(in); |
4df53d8b | 592 | if (p == NULL) |
deef4b52 | 593 | return NF_DROP; |
4df53d8b PM |
594 | br = p->br; |
595 | ||
739e4505 | 596 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
4df53d8b | 597 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 598 | return NF_ACCEPT; |
4df53d8b | 599 | |
fc38582d | 600 | nf_bridge_pull_encap_header_rcsum(skb); |
795aa6ef | 601 | return br_nf_pre_routing_ipv6(ops, skb, in, out, okfn); |
1da177e4 | 602 | } |
4df53d8b PM |
603 | |
604 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 605 | return NF_ACCEPT; |
1da177e4 | 606 | |
739e4505 | 607 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
1da177e4 LT |
608 | return NF_ACCEPT; |
609 | ||
fc38582d | 610 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 611 | |
462fb2af | 612 | if (br_parse_ip_options(skb)) |
deef4b52 | 613 | return NF_DROP; |
17762060 | 614 | |
789bc3e5 | 615 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 616 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 617 | return NF_DROP; |
5dce971a SH |
618 | if (!setup_pre_routing(skb)) |
619 | return NF_DROP; | |
1da177e4 | 620 | store_orig_dstaddr(skb); |
e179e632 | 621 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 622 | |
713aefa3 | 623 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
624 | br_nf_pre_routing_finish); |
625 | ||
626 | return NF_STOLEN; | |
1da177e4 LT |
627 | } |
628 | ||
629 | ||
630 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
631 | /* The packet is locally destined, which requires a real | |
632 | * dst_entry, so detach the fake one. On the way up, the | |
633 | * packet would pass through PRE_ROUTING again (which already | |
634 | * took place when the packet entered the bridge), but we | |
635 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
636 | * prevent this from happening. */ | |
795aa6ef PM |
637 | static unsigned int br_nf_local_in(const struct nf_hook_ops *ops, |
638 | struct sk_buff *skb, | |
789bc3e5 SH |
639 | const struct net_device *in, |
640 | const struct net_device *out, | |
641 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 642 | { |
a881e963 | 643 | br_drop_fake_rtable(skb); |
1da177e4 LT |
644 | return NF_ACCEPT; |
645 | } | |
646 | ||
1da177e4 LT |
647 | /* PF_BRIDGE/FORWARD *************************************************/ |
648 | static int br_nf_forward_finish(struct sk_buff *skb) | |
649 | { | |
650 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
651 | struct net_device *in; | |
1da177e4 | 652 | |
739e4505 | 653 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
654 | in = nf_bridge->physindev; |
655 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
656 | skb->pkt_type = PACKET_OTHERHOST; | |
657 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
658 | } | |
e94c6743 | 659 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
660 | } else { |
661 | in = *((struct net_device **)(skb->cb)); | |
662 | } | |
fc38582d | 663 | nf_bridge_push_encap_header(skb); |
e179e632 | 664 | |
713aefa3 | 665 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 666 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
667 | return 0; |
668 | } | |
669 | ||
739e4505 | 670 | |
1da177e4 LT |
671 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
672 | * netfilter with indev and outdev set to the bridge device, | |
673 | * but we are still able to filter on the 'real' indev/outdev | |
674 | * because of the physdev module. For ARP, indev and outdev are the | |
675 | * bridge ports. */ | |
795aa6ef PM |
676 | static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops, |
677 | struct sk_buff *skb, | |
789bc3e5 SH |
678 | const struct net_device *in, |
679 | const struct net_device *out, | |
680 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 681 | { |
1da177e4 | 682 | struct nf_bridge_info *nf_bridge; |
5dce971a | 683 | struct net_device *parent; |
76108cea | 684 | u_int8_t pf; |
1da177e4 LT |
685 | |
686 | if (!skb->nf_bridge) | |
687 | return NF_ACCEPT; | |
688 | ||
2dc2f207 PM |
689 | /* Need exclusive nf_bridge_info since we might have multiple |
690 | * different physoutdevs. */ | |
691 | if (!nf_bridge_unshare(skb)) | |
692 | return NF_DROP; | |
693 | ||
5dce971a SH |
694 | parent = bridge_parent(out); |
695 | if (!parent) | |
696 | return NF_DROP; | |
697 | ||
739e4505 | 698 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 699 | pf = NFPROTO_IPV4; |
739e4505 | 700 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 701 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
702 | else |
703 | return NF_ACCEPT; | |
1da177e4 | 704 | |
3db05fea | 705 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 706 | |
1da177e4 LT |
707 | nf_bridge = skb->nf_bridge; |
708 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
709 | skb->pkt_type = PACKET_HOST; | |
710 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
711 | } | |
712 | ||
aa740f46 | 713 | if (pf == NFPROTO_IPV4 && br_parse_ip_options(skb)) |
6b1e960f HX |
714 | return NF_DROP; |
715 | ||
1da177e4 LT |
716 | /* The physdev module checks on this */ |
717 | nf_bridge->mask |= BRNF_BRIDGED; | |
718 | nf_bridge->physoutdev = skb->dev; | |
aa740f46 | 719 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
720 | skb->protocol = htons(ETH_P_IP); |
721 | else | |
722 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 723 | |
4981682c | 724 | NF_HOOK(pf, NF_INET_FORWARD, skb, brnf_get_logical_dev(skb, in), parent, |
5dce971a | 725 | br_nf_forward_finish); |
1da177e4 LT |
726 | |
727 | return NF_STOLEN; | |
728 | } | |
729 | ||
795aa6ef PM |
730 | static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, |
731 | struct sk_buff *skb, | |
789bc3e5 SH |
732 | const struct net_device *in, |
733 | const struct net_device *out, | |
734 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 735 | { |
4df53d8b PM |
736 | struct net_bridge_port *p; |
737 | struct net_bridge *br; | |
1da177e4 LT |
738 | struct net_device **d = (struct net_device **)(skb->cb); |
739 | ||
e490c1de | 740 | p = br_port_get_rcu(out); |
4df53d8b PM |
741 | if (p == NULL) |
742 | return NF_ACCEPT; | |
743 | br = p->br; | |
744 | ||
745 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 746 | return NF_ACCEPT; |
1da177e4 | 747 | |
739e4505 | 748 | if (!IS_ARP(skb)) { |
8b42ec39 | 749 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 750 | return NF_ACCEPT; |
3db05fea | 751 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
752 | } |
753 | ||
d0a92be0 | 754 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 755 | if (IS_VLAN_ARP(skb)) |
3db05fea | 756 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
757 | return NF_ACCEPT; |
758 | } | |
759 | *d = (struct net_device *)in; | |
fdc9314c | 760 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
761 | (struct net_device *)out, br_nf_forward_finish); |
762 | ||
763 | return NF_STOLEN; | |
764 | } | |
765 | ||
aff09ce3 | 766 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
2e2f7aef PM |
767 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
768 | { | |
462fb2af | 769 | int ret; |
93fdd47e | 770 | int frag_max_size; |
462fb2af | 771 | |
93fdd47e HX |
772 | /* This is wrong! We should preserve the original fragment |
773 | * boundaries by preserving frag_list rather than refragmenting. | |
774 | */ | |
aff09ce3 | 775 | if (skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 776 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 777 | !skb_is_gso(skb)) { |
93fdd47e | 778 | frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size; |
462fb2af BD |
779 | if (br_parse_ip_options(skb)) |
780 | /* Drop invalid packet */ | |
781 | return NF_DROP; | |
93fdd47e | 782 | IPCB(skb)->frag_max_size = frag_max_size; |
462fb2af | 783 | ret = ip_fragment(skb, br_dev_queue_push_xmit); |
87f94b4e | 784 | } else |
462fb2af BD |
785 | ret = br_dev_queue_push_xmit(skb); |
786 | ||
787 | return ret; | |
2e2f7aef | 788 | } |
c197facc | 789 | #else |
790 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
791 | { | |
792 | return br_dev_queue_push_xmit(skb); | |
793 | } | |
794 | #endif | |
1da177e4 LT |
795 | |
796 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
795aa6ef PM |
797 | static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops, |
798 | struct sk_buff *skb, | |
789bc3e5 SH |
799 | const struct net_device *in, |
800 | const struct net_device *out, | |
801 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 802 | { |
3db05fea | 803 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 804 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 805 | u_int8_t pf; |
1da177e4 | 806 | |
ea2d9b41 | 807 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
808 | return NF_ACCEPT; |
809 | ||
5dce971a SH |
810 | if (!realoutdev) |
811 | return NF_DROP; | |
812 | ||
739e4505 | 813 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 814 | pf = NFPROTO_IPV4; |
739e4505 | 815 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 816 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
817 | else |
818 | return NF_ACCEPT; | |
1da177e4 | 819 | |
1da177e4 LT |
820 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
821 | * about the value of skb->pkt_type. */ | |
822 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
823 | skb->pkt_type = PACKET_HOST; | |
824 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
825 | } | |
826 | ||
fc38582d | 827 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 828 | nf_bridge_save_header(skb); |
aa740f46 | 829 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
830 | skb->protocol = htons(ETH_P_IP); |
831 | else | |
832 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 833 | |
6e23ae2a | 834 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 835 | br_nf_dev_queue_xmit); |
1da177e4 LT |
836 | |
837 | return NF_STOLEN; | |
1da177e4 LT |
838 | } |
839 | ||
1da177e4 LT |
840 | /* IP/SABOTAGE *****************************************************/ |
841 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
842 | * for the second time. */ | |
795aa6ef PM |
843 | static unsigned int ip_sabotage_in(const struct nf_hook_ops *ops, |
844 | struct sk_buff *skb, | |
789bc3e5 SH |
845 | const struct net_device *in, |
846 | const struct net_device *out, | |
847 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 848 | { |
3db05fea HX |
849 | if (skb->nf_bridge && |
850 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
851 | return NF_STOP; |
852 | } | |
853 | ||
854 | return NF_ACCEPT; | |
855 | } | |
856 | ||
4b7fd5d9 PNA |
857 | void br_netfilter_enable(void) |
858 | { | |
859 | } | |
860 | EXPORT_SYMBOL_GPL(br_netfilter_enable); | |
861 | ||
ea2d9b41 BDS |
862 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
863 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 864 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
865 | { |
866 | .hook = br_nf_pre_routing, | |
867 | .owner = THIS_MODULE, | |
aa740f46 | 868 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
869 | .hooknum = NF_BR_PRE_ROUTING, |
870 | .priority = NF_BR_PRI_BRNF, | |
871 | }, | |
872 | { | |
873 | .hook = br_nf_local_in, | |
874 | .owner = THIS_MODULE, | |
aa740f46 | 875 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
876 | .hooknum = NF_BR_LOCAL_IN, |
877 | .priority = NF_BR_PRI_BRNF, | |
878 | }, | |
879 | { | |
880 | .hook = br_nf_forward_ip, | |
881 | .owner = THIS_MODULE, | |
aa740f46 | 882 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
883 | .hooknum = NF_BR_FORWARD, |
884 | .priority = NF_BR_PRI_BRNF - 1, | |
885 | }, | |
886 | { | |
887 | .hook = br_nf_forward_arp, | |
888 | .owner = THIS_MODULE, | |
aa740f46 | 889 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
890 | .hooknum = NF_BR_FORWARD, |
891 | .priority = NF_BR_PRI_BRNF, | |
892 | }, | |
1490fd89 CG |
893 | { |
894 | .hook = br_nf_post_routing, | |
895 | .owner = THIS_MODULE, | |
aa740f46 | 896 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
897 | .hooknum = NF_BR_POST_ROUTING, |
898 | .priority = NF_BR_PRI_LAST, | |
899 | }, | |
900 | { | |
901 | .hook = ip_sabotage_in, | |
902 | .owner = THIS_MODULE, | |
aa740f46 | 903 | .pf = NFPROTO_IPV4, |
1490fd89 CG |
904 | .hooknum = NF_INET_PRE_ROUTING, |
905 | .priority = NF_IP_PRI_FIRST, | |
906 | }, | |
907 | { | |
908 | .hook = ip_sabotage_in, | |
909 | .owner = THIS_MODULE, | |
aa740f46 | 910 | .pf = NFPROTO_IPV6, |
1490fd89 CG |
911 | .hooknum = NF_INET_PRE_ROUTING, |
912 | .priority = NF_IP6_PRI_FIRST, | |
913 | }, | |
1da177e4 LT |
914 | }; |
915 | ||
916 | #ifdef CONFIG_SYSCTL | |
917 | static | |
fe2c6338 | 918 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
56b148eb | 919 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
920 | { |
921 | int ret; | |
922 | ||
8d65af78 | 923 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
924 | |
925 | if (write && *(int *)(ctl->data)) | |
926 | *(int *)(ctl->data) = 1; | |
927 | return ret; | |
928 | } | |
929 | ||
fe2c6338 | 930 | static struct ctl_table brnf_table[] = { |
1da177e4 | 931 | { |
1da177e4 LT |
932 | .procname = "bridge-nf-call-arptables", |
933 | .data = &brnf_call_arptables, | |
934 | .maxlen = sizeof(int), | |
935 | .mode = 0644, | |
6d9f239a | 936 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
937 | }, |
938 | { | |
1da177e4 LT |
939 | .procname = "bridge-nf-call-iptables", |
940 | .data = &brnf_call_iptables, | |
941 | .maxlen = sizeof(int), | |
942 | .mode = 0644, | |
6d9f239a | 943 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
944 | }, |
945 | { | |
1da177e4 LT |
946 | .procname = "bridge-nf-call-ip6tables", |
947 | .data = &brnf_call_ip6tables, | |
948 | .maxlen = sizeof(int), | |
949 | .mode = 0644, | |
6d9f239a | 950 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
951 | }, |
952 | { | |
1da177e4 LT |
953 | .procname = "bridge-nf-filter-vlan-tagged", |
954 | .data = &brnf_filter_vlan_tagged, | |
955 | .maxlen = sizeof(int), | |
956 | .mode = 0644, | |
6d9f239a | 957 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
958 | }, |
959 | { | |
516299d2 MM |
960 | .procname = "bridge-nf-filter-pppoe-tagged", |
961 | .data = &brnf_filter_pppoe_tagged, | |
962 | .maxlen = sizeof(int), | |
963 | .mode = 0644, | |
6d9f239a | 964 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 965 | }, |
4981682c PNA |
966 | { |
967 | .procname = "bridge-nf-pass-vlan-input-dev", | |
968 | .data = &brnf_pass_vlan_indev, | |
969 | .maxlen = sizeof(int), | |
970 | .mode = 0644, | |
971 | .proc_handler = brnf_sysctl_call_tables, | |
972 | }, | |
f8572d8f | 973 | { } |
1da177e4 | 974 | }; |
1da177e4 LT |
975 | #endif |
976 | ||
34666d46 | 977 | static int __init br_netfilter_init(void) |
1da177e4 | 978 | { |
5eb87f45 | 979 | int ret; |
1da177e4 | 980 | |
34666d46 | 981 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
5eb87f45 | 982 | if (ret < 0) |
1da177e4 | 983 | return ret; |
fc66f95c | 984 | |
1da177e4 | 985 | #ifdef CONFIG_SYSCTL |
ec8f23ce | 986 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
1da177e4 | 987 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
988 | printk(KERN_WARNING |
989 | "br_netfilter: can't register to sysctl.\n"); | |
96727239 GU |
990 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
991 | return -ENOMEM; | |
1da177e4 LT |
992 | } |
993 | #endif | |
1da177e4 | 994 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
995 | return 0; |
996 | } | |
997 | ||
34666d46 | 998 | static void __exit br_netfilter_fini(void) |
1da177e4 | 999 | { |
5eb87f45 | 1000 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 | 1001 | #ifdef CONFIG_SYSCTL |
5dd3df10 | 1002 | unregister_net_sysctl_table(brnf_sysctl_header); |
1da177e4 LT |
1003 | #endif |
1004 | } | |
34666d46 PNA |
1005 | |
1006 | module_init(br_netfilter_init); | |
1007 | module_exit(br_netfilter_fini); | |
1008 | ||
1009 | MODULE_LICENSE("GPL"); | |
1010 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); | |
1011 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); | |
1012 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |