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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * Bart De Schuymer (maintainer) <bdschuym@pandora.be> | |
8 | * | |
9 | * Changes: | |
10 | * Apr 29 2003: physdev module support (bdschuym) | |
11 | * Jun 19 2003: let arptables see bridged ARP traffic (bdschuym) | |
12 | * Oct 06 2003: filter encapsulated IP/ARP VLAN traffic on untagged bridge | |
13 | * (bdschuym) | |
14 | * Sep 01 2004: add IPv6 filtering (bdschuym) | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | * | |
21 | * Lennert dedicates this file to Kerstin Wurdinger. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/ip.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/skbuff.h> | |
14c85021 | 29 | #include <linux/if_arp.h> |
1da177e4 LT |
30 | #include <linux/if_ether.h> |
31 | #include <linux/if_vlan.h> | |
516299d2 MM |
32 | #include <linux/if_pppox.h> |
33 | #include <linux/ppp_defs.h> | |
1da177e4 LT |
34 | #include <linux/netfilter_bridge.h> |
35 | #include <linux/netfilter_ipv4.h> | |
36 | #include <linux/netfilter_ipv6.h> | |
37 | #include <linux/netfilter_arp.h> | |
38 | #include <linux/in_route.h> | |
f216f082 | 39 | #include <linux/inetdevice.h> |
14c85021 | 40 | |
1da177e4 LT |
41 | #include <net/ip.h> |
42 | #include <net/ipv6.h> | |
14c85021 ACM |
43 | #include <net/route.h> |
44 | ||
1da177e4 | 45 | #include <asm/uaccess.h> |
1da177e4 LT |
46 | #include "br_private.h" |
47 | #ifdef CONFIG_SYSCTL | |
48 | #include <linux/sysctl.h> | |
49 | #endif | |
50 | ||
51 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
52 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
53 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
54 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 55 | |
1da177e4 LT |
56 | #ifdef CONFIG_SYSCTL |
57 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
58 | static int brnf_call_iptables __read_mostly = 1; |
59 | static int brnf_call_ip6tables __read_mostly = 1; | |
60 | static int brnf_call_arptables __read_mostly = 1; | |
61 | static int brnf_filter_vlan_tagged __read_mostly = 1; | |
516299d2 | 62 | static int brnf_filter_pppoe_tagged __read_mostly = 1; |
1da177e4 LT |
63 | #else |
64 | #define brnf_filter_vlan_tagged 1 | |
516299d2 | 65 | #define brnf_filter_pppoe_tagged 1 |
1da177e4 LT |
66 | #endif |
67 | ||
b6f99a21 | 68 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 SH |
69 | { |
70 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
71 | } | |
72 | ||
73 | #define IS_VLAN_IP(skb) \ | |
74 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
9d6f229f | 75 | vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
76 | brnf_filter_vlan_tagged) |
77 | ||
78 | #define IS_VLAN_IPV6(skb) \ | |
79 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
80 | vlan_proto(skb) == htons(ETH_P_IPV6) &&\ | |
81 | brnf_filter_vlan_tagged) | |
82 | ||
83 | #define IS_VLAN_ARP(skb) \ | |
84 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
85 | vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
86 | brnf_filter_vlan_tagged) | |
1da177e4 | 87 | |
516299d2 MM |
88 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
89 | { | |
90 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
91 | sizeof(struct pppoe_hdr))); | |
92 | } | |
93 | ||
94 | #define IS_PPPOE_IP(skb) \ | |
95 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
96 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
97 | brnf_filter_pppoe_tagged) | |
98 | ||
99 | #define IS_PPPOE_IPV6(skb) \ | |
100 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
101 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
102 | brnf_filter_pppoe_tagged) | |
103 | ||
1da177e4 LT |
104 | /* We need these fake structures to make netfilter happy -- |
105 | * lots of places assume that skb->dst != NULL, which isn't | |
106 | * all that unreasonable. | |
107 | * | |
108 | * Currently, we fill in the PMTU entry because netfilter | |
109 | * refragmentation needs it, and the rt_flags entry because | |
110 | * ipt_REJECT needs it. Future netfilter modules might | |
111 | * require us to fill additional fields. */ | |
112 | static struct net_device __fake_net_device = { | |
159d8336 | 113 | .hard_header_len = ETH_HLEN, |
df39e8ba | 114 | #ifdef CONFIG_NET_NS |
159d8336 | 115 | .nd_net = &init_net, |
df39e8ba | 116 | #endif |
1da177e4 LT |
117 | }; |
118 | ||
119 | static struct rtable __fake_rtable = { | |
120 | .u = { | |
121 | .dst = { | |
122 | .__refcnt = ATOMIC_INIT(1), | |
123 | .dev = &__fake_net_device, | |
124 | .path = &__fake_rtable.u.dst, | |
125 | .metrics = {[RTAX_MTU - 1] = 1500}, | |
42cf93cd | 126 | .flags = DST_NOXFRM, |
1da177e4 LT |
127 | } |
128 | }, | |
129 | .rt_flags = 0, | |
130 | }; | |
131 | ||
5dce971a SH |
132 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
133 | { | |
134 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
135 | ||
136 | return port ? port->br->dev : NULL; | |
137 | } | |
1da177e4 | 138 | |
fdeabdef SH |
139 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
140 | { | |
141 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
142 | if (likely(skb->nf_bridge)) | |
143 | atomic_set(&(skb->nf_bridge->use), 1); | |
144 | ||
145 | return skb->nf_bridge; | |
146 | } | |
147 | ||
2dc2f207 PM |
148 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
149 | { | |
150 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
151 | ||
152 | if (atomic_read(&nf_bridge->use) > 1) { | |
153 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
154 | ||
155 | if (tmp) { | |
156 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
157 | atomic_set(&tmp->use, 1); | |
158 | nf_bridge_put(nf_bridge); | |
159 | } | |
160 | nf_bridge = tmp; | |
161 | } | |
162 | return nf_bridge; | |
163 | } | |
164 | ||
fc38582d PM |
165 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
166 | { | |
167 | unsigned int len = nf_bridge_encap_header_len(skb); | |
168 | ||
169 | skb_push(skb, len); | |
170 | skb->network_header -= len; | |
171 | } | |
172 | ||
173 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 174 | { |
fc38582d PM |
175 | unsigned int len = nf_bridge_encap_header_len(skb); |
176 | ||
177 | skb_pull(skb, len); | |
178 | skb->network_header += len; | |
179 | } | |
fdeabdef | 180 | |
fc38582d PM |
181 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
182 | { | |
183 | unsigned int len = nf_bridge_encap_header_len(skb); | |
184 | ||
185 | skb_pull_rcsum(skb, len); | |
186 | skb->network_header += len; | |
187 | } | |
188 | ||
189 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
190 | { | |
191 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 192 | |
d626f62b ACM |
193 | skb_copy_from_linear_data_offset(skb, -header_size, |
194 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
195 | } |
196 | ||
07317621 SH |
197 | /* |
198 | * When forwarding bridge frames, we save a copy of the original | |
199 | * header before processing. | |
200 | */ | |
201 | int nf_bridge_copy_header(struct sk_buff *skb) | |
202 | { | |
203 | int err; | |
fc38582d | 204 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
07317621 | 205 | |
d9cc2048 | 206 | err = skb_cow_head(skb, header_size); |
07317621 SH |
207 | if (err) |
208 | return err; | |
209 | ||
27d7ff46 ACM |
210 | skb_copy_to_linear_data_offset(skb, -header_size, |
211 | skb->nf_bridge->data, header_size); | |
fc38582d | 212 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
213 | return 0; |
214 | } | |
215 | ||
1da177e4 LT |
216 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
217 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
218 | * bridge PRE_ROUTING hook. */ | |
219 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
220 | { | |
221 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
222 | ||
1da177e4 LT |
223 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
224 | skb->pkt_type = PACKET_OTHERHOST; | |
225 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
226 | } | |
227 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
228 | ||
ee6b9673 ED |
229 | skb->rtable = &__fake_rtable; |
230 | dst_hold(&__fake_rtable.u.dst); | |
1da177e4 LT |
231 | |
232 | skb->dev = nf_bridge->physindev; | |
fc38582d | 233 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
234 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
235 | br_handle_frame_finish, 1); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static void __br_dnat_complain(void) | |
241 | { | |
242 | static unsigned long last_complaint; | |
243 | ||
244 | if (jiffies - last_complaint >= 5 * HZ) { | |
245 | printk(KERN_WARNING "Performing cross-bridge DNAT requires IP " | |
789bc3e5 | 246 | "forwarding to be enabled\n"); |
1da177e4 LT |
247 | last_complaint = jiffies; |
248 | } | |
249 | } | |
250 | ||
251 | /* This requires some explaining. If DNAT has taken place, | |
252 | * we will need to fix up the destination Ethernet address, | |
253 | * and this is a tricky process. | |
254 | * | |
255 | * There are two cases to consider: | |
256 | * 1. The packet was DNAT'ed to a device in the same bridge | |
257 | * port group as it was received on. We can still bridge | |
258 | * the packet. | |
259 | * 2. The packet was DNAT'ed to a different device, either | |
260 | * a non-bridged device or another bridge port group. | |
261 | * The packet will need to be routed. | |
262 | * | |
263 | * The correct way of distinguishing between these two cases is to | |
264 | * call ip_route_input() and to look at skb->dst->dev, which is | |
265 | * changed to the destination device if ip_route_input() succeeds. | |
266 | * | |
267 | * Let us first consider the case that ip_route_input() succeeds: | |
268 | * | |
269 | * If skb->dst->dev equals the logical bridge device the packet | |
2948d2eb PM |
270 | * came in on, we can consider this bridging. The packet is passed |
271 | * through the neighbour output function to build a new destination | |
272 | * MAC address, which will make the packet enter br_nf_local_out() | |
1da177e4 LT |
273 | * not much later. In that function it is assured that the iptables |
274 | * FORWARD chain is traversed for the packet. | |
275 | * | |
276 | * Otherwise, the packet is considered to be routed and we just | |
277 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
278 | * later be passed up to the IP stack to be routed. For a redirected |
279 | * packet, ip_route_input() will give back the localhost as output device, | |
280 | * which differs from the bridge device. | |
1da177e4 LT |
281 | * |
282 | * Let us now consider the case that ip_route_input() fails: | |
283 | * | |
f216f082 BDS |
284 | * This can be because the destination address is martian, in which case |
285 | * the packet will be dropped. | |
1da177e4 LT |
286 | * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input() |
287 | * will fail, while __ip_route_output_key() will return success. The source | |
288 | * address for __ip_route_output_key() is set to zero, so __ip_route_output_key | |
289 | * thinks we're handling a locally generated packet and won't care | |
290 | * if IP forwarding is allowed. We send a warning message to the users's | |
291 | * log telling her to put IP forwarding on. | |
292 | * | |
293 | * ip_route_input() will also fail if there is no route available. | |
294 | * In that case we just drop the packet. | |
295 | * | |
296 | * --Lennert, 20020411 | |
297 | * --Bart, 20020416 (updated) | |
f216f082 BDS |
298 | * --Bart, 20021007 (updated) |
299 | * --Bart, 20062711 (updated) */ | |
1da177e4 LT |
300 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
301 | { | |
1da177e4 LT |
302 | if (skb->pkt_type == PACKET_OTHERHOST) { |
303 | skb->pkt_type = PACKET_HOST; | |
304 | skb->nf_bridge->mask |= BRNF_PKT_TYPE; | |
305 | } | |
306 | skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
307 | ||
308 | skb->dev = bridge_parent(skb->dev); | |
2948d2eb PM |
309 | if (skb->dev) { |
310 | struct dst_entry *dst = skb->dst; | |
311 | ||
fc38582d | 312 | nf_bridge_pull_encap_header(skb); |
2948d2eb PM |
313 | |
314 | if (dst->hh) | |
315 | return neigh_hh_output(dst->hh, skb); | |
316 | else if (dst->neighbour) | |
317 | return dst->neighbour->output(skb); | |
1da177e4 | 318 | } |
2948d2eb | 319 | kfree_skb(skb); |
1da177e4 LT |
320 | return 0; |
321 | } | |
322 | ||
323 | static int br_nf_pre_routing_finish(struct sk_buff *skb) | |
324 | { | |
325 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 326 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 327 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
f216f082 | 328 | int err; |
1da177e4 | 329 | |
1da177e4 LT |
330 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
331 | skb->pkt_type = PACKET_OTHERHOST; | |
332 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
333 | } | |
334 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 335 | if (dnat_took_place(skb)) { |
f216f082 | 336 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
1da177e4 | 337 | struct rtable *rt; |
789bc3e5 SH |
338 | struct flowi fl = { |
339 | .nl_u = { | |
340 | .ip4_u = { | |
341 | .daddr = iph->daddr, | |
342 | .saddr = 0, | |
343 | .tos = RT_TOS(iph->tos) }, | |
344 | }, | |
345 | .proto = 0, | |
346 | }; | |
f216f082 BDS |
347 | struct in_device *in_dev = in_dev_get(dev); |
348 | ||
349 | /* If err equals -EHOSTUNREACH the error is due to a | |
350 | * martian destination or due to the fact that | |
351 | * forwarding is disabled. For most martian packets, | |
352 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
353 | * martian destinations: loopback destinations and destination | |
354 | * 0.0.0.0. In both cases the packet will be dropped because the | |
355 | * destination is the loopback device and not the bridge. */ | |
356 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
357 | goto free_skb; | |
1da177e4 | 358 | |
f206351a | 359 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
1c011bed | 360 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
361 | * require ip_forwarding. */ |
362 | if (((struct dst_entry *)rt)->dev == dev) { | |
1da177e4 LT |
363 | skb->dst = (struct dst_entry *)rt; |
364 | goto bridged_dnat; | |
365 | } | |
f216f082 BDS |
366 | /* we are sure that forwarding is disabled, so printing |
367 | * this message is no problem. Note that the packet could | |
368 | * still have a martian destination address, in which case | |
369 | * the packet could be dropped even if forwarding were enabled */ | |
1da177e4 LT |
370 | __br_dnat_complain(); |
371 | dst_release((struct dst_entry *)rt); | |
372 | } | |
f216f082 | 373 | free_skb: |
1da177e4 LT |
374 | kfree_skb(skb); |
375 | return 0; | |
376 | } else { | |
377 | if (skb->dst->dev == dev) { | |
378 | bridged_dnat: | |
379 | /* Tell br_nf_local_out this is a | |
380 | * bridged frame */ | |
381 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
382 | skb->dev = nf_bridge->physindev; | |
fc38582d | 383 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
384 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, |
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 { | |
ee6b9673 ED |
394 | skb->rtable = &__fake_rtable; |
395 | dst_hold(&__fake_rtable.u.dst); | |
1da177e4 LT |
396 | } |
397 | ||
398 | skb->dev = nf_bridge->physindev; | |
fc38582d | 399 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
400 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
401 | br_handle_frame_finish, 1); | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 407 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
408 | { |
409 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
410 | ||
411 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
412 | skb->pkt_type = PACKET_HOST; | |
413 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
414 | } | |
415 | ||
416 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
417 | nf_bridge->physindev = skb->dev; | |
418 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
419 | |
420 | return skb->dev; | |
1da177e4 LT |
421 | } |
422 | ||
423 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
424 | static int check_hbh_len(struct sk_buff *skb) | |
425 | { | |
0660e03f | 426 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 427 | u32 pkt_len; |
d56f90a7 ACM |
428 | const unsigned char *nh = skb_network_header(skb); |
429 | int off = raw - nh; | |
789bc3e5 | 430 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
431 | |
432 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
433 | goto bad; | |
434 | ||
435 | off += 2; | |
436 | len -= 2; | |
437 | ||
438 | while (len > 0) { | |
d56f90a7 | 439 | int optlen = nh[off + 1] + 2; |
1da177e4 | 440 | |
d56f90a7 | 441 | switch (nh[off]) { |
1da177e4 LT |
442 | case IPV6_TLV_PAD0: |
443 | optlen = 1; | |
444 | break; | |
445 | ||
446 | case IPV6_TLV_PADN: | |
447 | break; | |
448 | ||
449 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 450 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 451 | goto bad; |
d56f90a7 | 452 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 453 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 454 | ipv6_hdr(skb)->payload_len) |
b0366486 | 455 | goto bad; |
1da177e4 LT |
456 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
457 | goto bad; | |
b0366486 | 458 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 459 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 460 | goto bad; |
d56f90a7 | 461 | nh = skb_network_header(skb); |
1da177e4 LT |
462 | break; |
463 | default: | |
464 | if (optlen > len) | |
465 | goto bad; | |
466 | break; | |
467 | } | |
468 | off += optlen; | |
469 | len -= optlen; | |
470 | } | |
471 | if (len == 0) | |
472 | return 0; | |
473 | bad: | |
474 | return -1; | |
475 | ||
476 | } | |
477 | ||
478 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
479 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
480 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
481 | struct sk_buff *skb, |
482 | const struct net_device *in, | |
483 | const struct net_device *out, | |
484 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
485 | { |
486 | struct ipv6hdr *hdr; | |
487 | u32 pkt_len; | |
1da177e4 LT |
488 | |
489 | if (skb->len < sizeof(struct ipv6hdr)) | |
490 | goto inhdr_error; | |
491 | ||
492 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
493 | goto inhdr_error; | |
494 | ||
0660e03f | 495 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
496 | |
497 | if (hdr->version != 6) | |
498 | goto inhdr_error; | |
499 | ||
500 | pkt_len = ntohs(hdr->payload_len); | |
501 | ||
502 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
503 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
504 | goto inhdr_error; | |
b38dfee3 HX |
505 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
506 | goto inhdr_error; | |
1da177e4 LT |
507 | } |
508 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 509 | goto inhdr_error; |
1da177e4 | 510 | |
789bc3e5 | 511 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 512 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 513 | return NF_DROP; |
5dce971a SH |
514 | if (!setup_pre_routing(skb)) |
515 | return NF_DROP; | |
1da177e4 | 516 | |
6e23ae2a | 517 | NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
518 | br_nf_pre_routing_finish_ipv6); |
519 | ||
520 | return NF_STOLEN; | |
521 | ||
522 | inhdr_error: | |
523 | return NF_DROP; | |
524 | } | |
525 | ||
526 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
527 | * Replicate the checks that IPv4 does on packet reception. | |
528 | * Set skb->dev to the bridge device (i.e. parent of the | |
529 | * receiving device) to make netfilter happy, the REDIRECT | |
530 | * target in particular. Save the original destination IP | |
531 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 532 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
533 | const struct net_device *in, |
534 | const struct net_device *out, | |
535 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
536 | { |
537 | struct iphdr *iph; | |
e7c243c9 EP |
538 | __u32 len = nf_bridge_encap_header_len(skb); |
539 | ||
e7c243c9 EP |
540 | if (unlikely(!pskb_may_pull(skb, len))) |
541 | goto out; | |
1da177e4 | 542 | |
516299d2 MM |
543 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
544 | IS_PPPOE_IPV6(skb)) { | |
1da177e4 LT |
545 | #ifdef CONFIG_SYSCTL |
546 | if (!brnf_call_ip6tables) | |
547 | return NF_ACCEPT; | |
548 | #endif | |
fc38582d | 549 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
550 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
551 | } | |
552 | #ifdef CONFIG_SYSCTL | |
553 | if (!brnf_call_iptables) | |
554 | return NF_ACCEPT; | |
555 | #endif | |
556 | ||
516299d2 MM |
557 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
558 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
559 | return NF_ACCEPT; |
560 | ||
fc38582d | 561 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
562 | |
563 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
564 | goto inhdr_error; | |
565 | ||
eddc9ec5 | 566 | iph = ip_hdr(skb); |
1da177e4 LT |
567 | if (iph->ihl < 5 || iph->version != 4) |
568 | goto inhdr_error; | |
569 | ||
789bc3e5 | 570 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
571 | goto inhdr_error; |
572 | ||
eddc9ec5 | 573 | iph = ip_hdr(skb); |
789bc3e5 | 574 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
575 | goto inhdr_error; |
576 | ||
577 | len = ntohs(iph->tot_len); | |
789bc3e5 | 578 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
579 | goto inhdr_error; |
580 | ||
b38dfee3 | 581 | pskb_trim_rcsum(skb, len); |
1da177e4 | 582 | |
789bc3e5 | 583 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 584 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 585 | return NF_DROP; |
5dce971a SH |
586 | if (!setup_pre_routing(skb)) |
587 | return NF_DROP; | |
1da177e4 LT |
588 | store_orig_dstaddr(skb); |
589 | ||
6e23ae2a | 590 | NF_HOOK(PF_INET, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
591 | br_nf_pre_routing_finish); |
592 | ||
593 | return NF_STOLEN; | |
594 | ||
595 | inhdr_error: | |
789bc3e5 | 596 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
597 | out: |
598 | return NF_DROP; | |
599 | } | |
600 | ||
601 | ||
602 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
603 | /* The packet is locally destined, which requires a real | |
604 | * dst_entry, so detach the fake one. On the way up, the | |
605 | * packet would pass through PRE_ROUTING again (which already | |
606 | * took place when the packet entered the bridge), but we | |
607 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
608 | * prevent this from happening. */ | |
3db05fea | 609 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
610 | const struct net_device *in, |
611 | const struct net_device *out, | |
612 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 613 | { |
ee6b9673 ED |
614 | if (skb->rtable == &__fake_rtable) { |
615 | dst_release(&__fake_rtable.u.dst); | |
616 | skb->rtable = NULL; | |
1da177e4 LT |
617 | } |
618 | ||
619 | return NF_ACCEPT; | |
620 | } | |
621 | ||
1da177e4 LT |
622 | /* PF_BRIDGE/FORWARD *************************************************/ |
623 | static int br_nf_forward_finish(struct sk_buff *skb) | |
624 | { | |
625 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
626 | struct net_device *in; | |
1da177e4 | 627 | |
8b42ec39 | 628 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
629 | in = nf_bridge->physindev; |
630 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
631 | skb->pkt_type = PACKET_OTHERHOST; | |
632 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
633 | } | |
634 | } else { | |
635 | in = *((struct net_device **)(skb->cb)); | |
636 | } | |
fc38582d | 637 | nf_bridge_push_encap_header(skb); |
1da177e4 | 638 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 639 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
640 | return 0; |
641 | } | |
642 | ||
643 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
644 | * netfilter with indev and outdev set to the bridge device, | |
645 | * but we are still able to filter on the 'real' indev/outdev | |
646 | * because of the physdev module. For ARP, indev and outdev are the | |
647 | * bridge ports. */ | |
3db05fea | 648 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
649 | const struct net_device *in, |
650 | const struct net_device *out, | |
651 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 652 | { |
1da177e4 | 653 | struct nf_bridge_info *nf_bridge; |
5dce971a | 654 | struct net_device *parent; |
1da177e4 LT |
655 | int pf; |
656 | ||
657 | if (!skb->nf_bridge) | |
658 | return NF_ACCEPT; | |
659 | ||
2dc2f207 PM |
660 | /* Need exclusive nf_bridge_info since we might have multiple |
661 | * different physoutdevs. */ | |
662 | if (!nf_bridge_unshare(skb)) | |
663 | return NF_DROP; | |
664 | ||
5dce971a SH |
665 | parent = bridge_parent(out); |
666 | if (!parent) | |
667 | return NF_DROP; | |
668 | ||
516299d2 MM |
669 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
670 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
671 | pf = PF_INET; |
672 | else | |
673 | pf = PF_INET6; | |
674 | ||
3db05fea | 675 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 676 | |
1da177e4 LT |
677 | nf_bridge = skb->nf_bridge; |
678 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
679 | skb->pkt_type = PACKET_HOST; | |
680 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
681 | } | |
682 | ||
683 | /* The physdev module checks on this */ | |
684 | nf_bridge->mask |= BRNF_BRIDGED; | |
685 | nf_bridge->physoutdev = skb->dev; | |
686 | ||
6e23ae2a | 687 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 688 | br_nf_forward_finish); |
1da177e4 LT |
689 | |
690 | return NF_STOLEN; | |
691 | } | |
692 | ||
3db05fea | 693 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
694 | const struct net_device *in, |
695 | const struct net_device *out, | |
696 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 697 | { |
1da177e4 LT |
698 | struct net_device **d = (struct net_device **)(skb->cb); |
699 | ||
700 | #ifdef CONFIG_SYSCTL | |
701 | if (!brnf_call_arptables) | |
702 | return NF_ACCEPT; | |
703 | #endif | |
704 | ||
f8a26028 | 705 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 706 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 707 | return NF_ACCEPT; |
3db05fea | 708 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
709 | } |
710 | ||
d0a92be0 | 711 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 712 | if (IS_VLAN_ARP(skb)) |
3db05fea | 713 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
714 | return NF_ACCEPT; |
715 | } | |
716 | *d = (struct net_device *)in; | |
717 | NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, | |
718 | (struct net_device *)out, br_nf_forward_finish); | |
719 | ||
720 | return NF_STOLEN; | |
721 | } | |
722 | ||
2bf540b7 PM |
723 | /* PF_BRIDGE/LOCAL_OUT *********************************************** |
724 | * | |
725 | * This function sees both locally originated IP packets and forwarded | |
1da177e4 LT |
726 | * IP packets (in both cases the destination device is a bridge |
727 | * device). It also sees bridged-and-DNAT'ed packets. | |
1da177e4 LT |
728 | * |
729 | * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged | |
730 | * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() | |
731 | * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority | |
732 | * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor | |
733 | * will be executed. | |
2bf540b7 | 734 | */ |
3db05fea | 735 | static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
736 | const struct net_device *in, |
737 | const struct net_device *out, | |
738 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 739 | { |
2bf540b7 | 740 | struct net_device *realindev; |
1da177e4 | 741 | struct nf_bridge_info *nf_bridge; |
1da177e4 LT |
742 | |
743 | if (!skb->nf_bridge) | |
744 | return NF_ACCEPT; | |
745 | ||
2dc2f207 PM |
746 | /* Need exclusive nf_bridge_info since we might have multiple |
747 | * different physoutdevs. */ | |
748 | if (!nf_bridge_unshare(skb)) | |
749 | return NF_DROP; | |
750 | ||
1da177e4 | 751 | nf_bridge = skb->nf_bridge; |
2bf540b7 PM |
752 | if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT)) |
753 | return NF_ACCEPT; | |
1da177e4 LT |
754 | |
755 | /* Bridged, take PF_BRIDGE/FORWARD. | |
756 | * (see big note in front of br_nf_pre_routing_finish) */ | |
2bf540b7 PM |
757 | nf_bridge->physoutdev = skb->dev; |
758 | realindev = nf_bridge->physindev; | |
1da177e4 | 759 | |
2bf540b7 PM |
760 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
761 | skb->pkt_type = PACKET_OTHERHOST; | |
762 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
1da177e4 | 763 | } |
fc38582d | 764 | nf_bridge_push_encap_header(skb); |
1da177e4 | 765 | |
2bf540b7 PM |
766 | NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev, |
767 | br_forward_finish); | |
1da177e4 LT |
768 | return NF_STOLEN; |
769 | } | |
770 | ||
2e2f7aef PM |
771 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
772 | { | |
773 | if (skb->protocol == htons(ETH_P_IP) && | |
774 | skb->len > skb->dev->mtu && | |
89114afd | 775 | !skb_is_gso(skb)) |
2e2f7aef PM |
776 | return ip_fragment(skb, br_dev_queue_push_xmit); |
777 | else | |
778 | return br_dev_queue_push_xmit(skb); | |
779 | } | |
1da177e4 LT |
780 | |
781 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 782 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
783 | const struct net_device *in, |
784 | const struct net_device *out, | |
785 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 786 | { |
3db05fea | 787 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 LT |
788 | struct net_device *realoutdev = bridge_parent(skb->dev); |
789 | int pf; | |
790 | ||
791 | #ifdef CONFIG_NETFILTER_DEBUG | |
792 | /* Be very paranoid. This probably won't happen anymore, but let's | |
793 | * keep the check just to be sure... */ | |
98e399f8 ACM |
794 | if (skb_mac_header(skb) < skb->head || |
795 | skb_mac_header(skb) + ETH_HLEN > skb->data) { | |
1da177e4 | 796 | printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " |
8394e9b2 | 797 | "bad mac.raw pointer.\n"); |
1da177e4 LT |
798 | goto print_error; |
799 | } | |
800 | #endif | |
801 | ||
802 | if (!nf_bridge) | |
803 | return NF_ACCEPT; | |
804 | ||
81d9ddae PM |
805 | if (!(nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))) |
806 | return NF_ACCEPT; | |
807 | ||
5dce971a SH |
808 | if (!realoutdev) |
809 | return NF_DROP; | |
810 | ||
516299d2 MM |
811 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
812 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
813 | pf = PF_INET; |
814 | else | |
815 | pf = PF_INET6; | |
816 | ||
817 | #ifdef CONFIG_NETFILTER_DEBUG | |
818 | if (skb->dst == NULL) { | |
8394e9b2 | 819 | printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL\n"); |
1da177e4 LT |
820 | goto print_error; |
821 | } | |
1da177e4 LT |
822 | #endif |
823 | ||
824 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
825 | * about the value of skb->pkt_type. */ | |
826 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
827 | skb->pkt_type = PACKET_HOST; | |
828 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
829 | } | |
830 | ||
fc38582d | 831 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
832 | nf_bridge_save_header(skb); |
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; | |
838 | ||
839 | #ifdef CONFIG_NETFILTER_DEBUG | |
840 | print_error: | |
841 | if (skb->dev != NULL) { | |
842 | printk("[%s]", skb->dev->name); | |
178a3259 SH |
843 | if (realoutdev) |
844 | printk("[%s]", realoutdev->name); | |
1da177e4 | 845 | } |
98e399f8 | 846 | printk(" head:%p, raw:%p, data:%p\n", skb->head, skb_mac_header(skb), |
789bc3e5 | 847 | skb->data); |
8394e9b2 | 848 | dump_stack(); |
1da177e4 LT |
849 | return NF_ACCEPT; |
850 | #endif | |
851 | } | |
852 | ||
1da177e4 LT |
853 | /* IP/SABOTAGE *****************************************************/ |
854 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
855 | * for the second time. */ | |
3db05fea | 856 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
857 | const struct net_device *in, |
858 | const struct net_device *out, | |
859 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 860 | { |
3db05fea HX |
861 | if (skb->nf_bridge && |
862 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
863 | return NF_STOP; |
864 | } | |
865 | ||
866 | return NF_ACCEPT; | |
867 | } | |
868 | ||
1da177e4 LT |
869 | /* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent |
870 | * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. | |
871 | * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
872 | * ip_refrag() can return NF_STOLEN. */ | |
1999414a | 873 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
9d6f229f YH |
874 | { .hook = br_nf_pre_routing, |
875 | .owner = THIS_MODULE, | |
876 | .pf = PF_BRIDGE, | |
877 | .hooknum = NF_BR_PRE_ROUTING, | |
1da177e4 LT |
878 | .priority = NF_BR_PRI_BRNF, }, |
879 | { .hook = br_nf_local_in, | |
880 | .owner = THIS_MODULE, | |
881 | .pf = PF_BRIDGE, | |
882 | .hooknum = NF_BR_LOCAL_IN, | |
883 | .priority = NF_BR_PRI_BRNF, }, | |
884 | { .hook = br_nf_forward_ip, | |
885 | .owner = THIS_MODULE, | |
886 | .pf = PF_BRIDGE, | |
887 | .hooknum = NF_BR_FORWARD, | |
888 | .priority = NF_BR_PRI_BRNF - 1, }, | |
889 | { .hook = br_nf_forward_arp, | |
890 | .owner = THIS_MODULE, | |
891 | .pf = PF_BRIDGE, | |
892 | .hooknum = NF_BR_FORWARD, | |
893 | .priority = NF_BR_PRI_BRNF, }, | |
894 | { .hook = br_nf_local_out, | |
895 | .owner = THIS_MODULE, | |
896 | .pf = PF_BRIDGE, | |
897 | .hooknum = NF_BR_LOCAL_OUT, | |
898 | .priority = NF_BR_PRI_FIRST, }, | |
899 | { .hook = br_nf_post_routing, | |
900 | .owner = THIS_MODULE, | |
901 | .pf = PF_BRIDGE, | |
902 | .hooknum = NF_BR_POST_ROUTING, | |
903 | .priority = NF_BR_PRI_LAST, }, | |
904 | { .hook = ip_sabotage_in, | |
905 | .owner = THIS_MODULE, | |
906 | .pf = PF_INET, | |
6e23ae2a | 907 | .hooknum = NF_INET_PRE_ROUTING, |
1da177e4 LT |
908 | .priority = NF_IP_PRI_FIRST, }, |
909 | { .hook = ip_sabotage_in, | |
910 | .owner = THIS_MODULE, | |
911 | .pf = PF_INET6, | |
6e23ae2a | 912 | .hooknum = NF_INET_PRE_ROUTING, |
1da177e4 | 913 | .priority = NF_IP6_PRI_FIRST, }, |
1da177e4 LT |
914 | }; |
915 | ||
916 | #ifdef CONFIG_SYSCTL | |
917 | static | |
789bc3e5 SH |
918 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp, |
919 | void __user * buffer, size_t * lenp, loff_t * ppos) | |
1da177e4 LT |
920 | { |
921 | int ret; | |
922 | ||
923 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
924 | ||
925 | if (write && *(int *)(ctl->data)) | |
926 | *(int *)(ctl->data) = 1; | |
927 | return ret; | |
928 | } | |
929 | ||
930 | static ctl_table brnf_table[] = { | |
931 | { | |
1da177e4 LT |
932 | .procname = "bridge-nf-call-arptables", |
933 | .data = &brnf_call_arptables, | |
934 | .maxlen = sizeof(int), | |
935 | .mode = 0644, | |
936 | .proc_handler = &brnf_sysctl_call_tables, | |
937 | }, | |
938 | { | |
1da177e4 LT |
939 | .procname = "bridge-nf-call-iptables", |
940 | .data = &brnf_call_iptables, | |
941 | .maxlen = sizeof(int), | |
942 | .mode = 0644, | |
943 | .proc_handler = &brnf_sysctl_call_tables, | |
944 | }, | |
945 | { | |
1da177e4 LT |
946 | .procname = "bridge-nf-call-ip6tables", |
947 | .data = &brnf_call_ip6tables, | |
948 | .maxlen = sizeof(int), | |
949 | .mode = 0644, | |
950 | .proc_handler = &brnf_sysctl_call_tables, | |
951 | }, | |
952 | { | |
1da177e4 LT |
953 | .procname = "bridge-nf-filter-vlan-tagged", |
954 | .data = &brnf_filter_vlan_tagged, | |
955 | .maxlen = sizeof(int), | |
956 | .mode = 0644, | |
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, | |
964 | .proc_handler = &brnf_sysctl_call_tables, | |
1da177e4 LT |
965 | }, |
966 | { .ctl_name = 0 } | |
967 | }; | |
968 | ||
b5ccd792 PE |
969 | static struct ctl_path brnf_path[] = { |
970 | { .procname = "net", .ctl_name = CTL_NET, }, | |
971 | { .procname = "bridge", .ctl_name = NET_BRIDGE, }, | |
972 | { } | |
1da177e4 LT |
973 | }; |
974 | #endif | |
975 | ||
5eb87f45 | 976 | int __init br_netfilter_init(void) |
1da177e4 | 977 | { |
5eb87f45 | 978 | int ret; |
1da177e4 | 979 | |
5eb87f45 PM |
980 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
981 | if (ret < 0) | |
1da177e4 | 982 | return ret; |
1da177e4 | 983 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 984 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 985 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
986 | printk(KERN_WARNING |
987 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 PM |
988 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
989 | return -ENOMEM; | |
1da177e4 LT |
990 | } |
991 | #endif | |
1da177e4 | 992 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
993 | return 0; |
994 | } | |
995 | ||
996 | void br_netfilter_fini(void) | |
997 | { | |
5eb87f45 | 998 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
999 | #ifdef CONFIG_SYSCTL |
1000 | unregister_sysctl_table(brnf_sysctl_header); | |
1001 | #endif | |
1002 | } |