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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 = { | |
113 | .hard_header_len = ETH_HLEN | |
114 | }; | |
115 | ||
116 | static struct rtable __fake_rtable = { | |
117 | .u = { | |
118 | .dst = { | |
119 | .__refcnt = ATOMIC_INIT(1), | |
120 | .dev = &__fake_net_device, | |
121 | .path = &__fake_rtable.u.dst, | |
122 | .metrics = {[RTAX_MTU - 1] = 1500}, | |
42cf93cd | 123 | .flags = DST_NOXFRM, |
1da177e4 LT |
124 | } |
125 | }, | |
126 | .rt_flags = 0, | |
127 | }; | |
128 | ||
5dce971a SH |
129 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
130 | { | |
131 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
132 | ||
133 | return port ? port->br->dev : NULL; | |
134 | } | |
1da177e4 | 135 | |
fdeabdef SH |
136 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
137 | { | |
138 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
139 | if (likely(skb->nf_bridge)) | |
140 | atomic_set(&(skb->nf_bridge->use), 1); | |
141 | ||
142 | return skb->nf_bridge; | |
143 | } | |
144 | ||
fc38582d PM |
145 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
146 | { | |
147 | unsigned int len = nf_bridge_encap_header_len(skb); | |
148 | ||
149 | skb_push(skb, len); | |
150 | skb->network_header -= len; | |
151 | } | |
152 | ||
153 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 154 | { |
fc38582d PM |
155 | unsigned int len = nf_bridge_encap_header_len(skb); |
156 | ||
157 | skb_pull(skb, len); | |
158 | skb->network_header += len; | |
159 | } | |
fdeabdef | 160 | |
fc38582d PM |
161 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
162 | { | |
163 | unsigned int len = nf_bridge_encap_header_len(skb); | |
164 | ||
165 | skb_pull_rcsum(skb, len); | |
166 | skb->network_header += len; | |
167 | } | |
168 | ||
169 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
170 | { | |
171 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 172 | |
d626f62b ACM |
173 | skb_copy_from_linear_data_offset(skb, -header_size, |
174 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
175 | } |
176 | ||
07317621 SH |
177 | /* |
178 | * When forwarding bridge frames, we save a copy of the original | |
179 | * header before processing. | |
180 | */ | |
181 | int nf_bridge_copy_header(struct sk_buff *skb) | |
182 | { | |
183 | int err; | |
fc38582d | 184 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
07317621 | 185 | |
d9cc2048 | 186 | err = skb_cow_head(skb, header_size); |
07317621 SH |
187 | if (err) |
188 | return err; | |
189 | ||
27d7ff46 ACM |
190 | skb_copy_to_linear_data_offset(skb, -header_size, |
191 | skb->nf_bridge->data, header_size); | |
fc38582d | 192 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
193 | return 0; |
194 | } | |
195 | ||
1da177e4 LT |
196 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
197 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
198 | * bridge PRE_ROUTING hook. */ | |
199 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
200 | { | |
201 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
202 | ||
1da177e4 LT |
203 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
204 | skb->pkt_type = PACKET_OTHERHOST; | |
205 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
206 | } | |
207 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
208 | ||
209 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
210 | dst_hold(skb->dst); | |
211 | ||
212 | skb->dev = nf_bridge->physindev; | |
fc38582d | 213 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
214 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
215 | br_handle_frame_finish, 1); | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static void __br_dnat_complain(void) | |
221 | { | |
222 | static unsigned long last_complaint; | |
223 | ||
224 | if (jiffies - last_complaint >= 5 * HZ) { | |
225 | printk(KERN_WARNING "Performing cross-bridge DNAT requires IP " | |
789bc3e5 | 226 | "forwarding to be enabled\n"); |
1da177e4 LT |
227 | last_complaint = jiffies; |
228 | } | |
229 | } | |
230 | ||
231 | /* This requires some explaining. If DNAT has taken place, | |
232 | * we will need to fix up the destination Ethernet address, | |
233 | * and this is a tricky process. | |
234 | * | |
235 | * There are two cases to consider: | |
236 | * 1. The packet was DNAT'ed to a device in the same bridge | |
237 | * port group as it was received on. We can still bridge | |
238 | * the packet. | |
239 | * 2. The packet was DNAT'ed to a different device, either | |
240 | * a non-bridged device or another bridge port group. | |
241 | * The packet will need to be routed. | |
242 | * | |
243 | * The correct way of distinguishing between these two cases is to | |
244 | * call ip_route_input() and to look at skb->dst->dev, which is | |
245 | * changed to the destination device if ip_route_input() succeeds. | |
246 | * | |
247 | * Let us first consider the case that ip_route_input() succeeds: | |
248 | * | |
249 | * If skb->dst->dev equals the logical bridge device the packet | |
250 | * came in on, we can consider this bridging. We then call | |
251 | * skb->dst->output() which will make the packet enter br_nf_local_out() | |
252 | * not much later. In that function it is assured that the iptables | |
253 | * FORWARD chain is traversed for the packet. | |
254 | * | |
255 | * Otherwise, the packet is considered to be routed and we just | |
256 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
257 | * later be passed up to the IP stack to be routed. For a redirected |
258 | * packet, ip_route_input() will give back the localhost as output device, | |
259 | * which differs from the bridge device. | |
1da177e4 LT |
260 | * |
261 | * Let us now consider the case that ip_route_input() fails: | |
262 | * | |
f216f082 BDS |
263 | * This can be because the destination address is martian, in which case |
264 | * the packet will be dropped. | |
1da177e4 LT |
265 | * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input() |
266 | * will fail, while __ip_route_output_key() will return success. The source | |
267 | * address for __ip_route_output_key() is set to zero, so __ip_route_output_key | |
268 | * thinks we're handling a locally generated packet and won't care | |
269 | * if IP forwarding is allowed. We send a warning message to the users's | |
270 | * log telling her to put IP forwarding on. | |
271 | * | |
272 | * ip_route_input() will also fail if there is no route available. | |
273 | * In that case we just drop the packet. | |
274 | * | |
275 | * --Lennert, 20020411 | |
276 | * --Bart, 20020416 (updated) | |
f216f082 BDS |
277 | * --Bart, 20021007 (updated) |
278 | * --Bart, 20062711 (updated) */ | |
1da177e4 LT |
279 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
280 | { | |
1da177e4 LT |
281 | if (skb->pkt_type == PACKET_OTHERHOST) { |
282 | skb->pkt_type = PACKET_HOST; | |
283 | skb->nf_bridge->mask |= BRNF_PKT_TYPE; | |
284 | } | |
285 | skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
286 | ||
287 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
288 | if (!skb->dev) |
289 | kfree_skb(skb); | |
290 | else { | |
fc38582d | 291 | nf_bridge_pull_encap_header(skb); |
5dce971a | 292 | skb->dst->output(skb); |
1da177e4 | 293 | } |
1da177e4 LT |
294 | return 0; |
295 | } | |
296 | ||
297 | static int br_nf_pre_routing_finish(struct sk_buff *skb) | |
298 | { | |
299 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 300 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 301 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
f216f082 | 302 | int err; |
1da177e4 | 303 | |
1da177e4 LT |
304 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
305 | skb->pkt_type = PACKET_OTHERHOST; | |
306 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
307 | } | |
308 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 309 | if (dnat_took_place(skb)) { |
f216f082 | 310 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
1da177e4 | 311 | struct rtable *rt; |
789bc3e5 SH |
312 | struct flowi fl = { |
313 | .nl_u = { | |
314 | .ip4_u = { | |
315 | .daddr = iph->daddr, | |
316 | .saddr = 0, | |
317 | .tos = RT_TOS(iph->tos) }, | |
318 | }, | |
319 | .proto = 0, | |
320 | }; | |
f216f082 BDS |
321 | struct in_device *in_dev = in_dev_get(dev); |
322 | ||
323 | /* If err equals -EHOSTUNREACH the error is due to a | |
324 | * martian destination or due to the fact that | |
325 | * forwarding is disabled. For most martian packets, | |
326 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
327 | * martian destinations: loopback destinations and destination | |
328 | * 0.0.0.0. In both cases the packet will be dropped because the | |
329 | * destination is the loopback device and not the bridge. */ | |
330 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
331 | goto free_skb; | |
1da177e4 LT |
332 | |
333 | if (!ip_route_output_key(&rt, &fl)) { | |
1c011bed | 334 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
335 | * require ip_forwarding. */ |
336 | if (((struct dst_entry *)rt)->dev == dev) { | |
1da177e4 LT |
337 | skb->dst = (struct dst_entry *)rt; |
338 | goto bridged_dnat; | |
339 | } | |
f216f082 BDS |
340 | /* we are sure that forwarding is disabled, so printing |
341 | * this message is no problem. Note that the packet could | |
342 | * still have a martian destination address, in which case | |
343 | * the packet could be dropped even if forwarding were enabled */ | |
1da177e4 LT |
344 | __br_dnat_complain(); |
345 | dst_release((struct dst_entry *)rt); | |
346 | } | |
f216f082 | 347 | free_skb: |
1da177e4 LT |
348 | kfree_skb(skb); |
349 | return 0; | |
350 | } else { | |
351 | if (skb->dst->dev == dev) { | |
352 | bridged_dnat: | |
353 | /* Tell br_nf_local_out this is a | |
354 | * bridged frame */ | |
355 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
356 | skb->dev = nf_bridge->physindev; | |
fc38582d | 357 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
358 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, |
359 | skb, skb->dev, NULL, | |
360 | br_nf_pre_routing_finish_bridge, | |
361 | 1); | |
362 | return 0; | |
363 | } | |
789bc3e5 | 364 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
365 | skb->pkt_type = PACKET_HOST; |
366 | } | |
367 | } else { | |
368 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
369 | dst_hold(skb->dst); | |
370 | } | |
371 | ||
372 | skb->dev = nf_bridge->physindev; | |
fc38582d | 373 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
374 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
375 | br_handle_frame_finish, 1); | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 381 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
382 | { |
383 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
384 | ||
385 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
386 | skb->pkt_type = PACKET_HOST; | |
387 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
388 | } | |
389 | ||
390 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
391 | nf_bridge->physindev = skb->dev; | |
392 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
393 | |
394 | return skb->dev; | |
1da177e4 LT |
395 | } |
396 | ||
397 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
398 | static int check_hbh_len(struct sk_buff *skb) | |
399 | { | |
0660e03f | 400 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 401 | u32 pkt_len; |
d56f90a7 ACM |
402 | const unsigned char *nh = skb_network_header(skb); |
403 | int off = raw - nh; | |
789bc3e5 | 404 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
405 | |
406 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
407 | goto bad; | |
408 | ||
409 | off += 2; | |
410 | len -= 2; | |
411 | ||
412 | while (len > 0) { | |
d56f90a7 | 413 | int optlen = nh[off + 1] + 2; |
1da177e4 | 414 | |
d56f90a7 | 415 | switch (nh[off]) { |
1da177e4 LT |
416 | case IPV6_TLV_PAD0: |
417 | optlen = 1; | |
418 | break; | |
419 | ||
420 | case IPV6_TLV_PADN: | |
421 | break; | |
422 | ||
423 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 424 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 425 | goto bad; |
d56f90a7 | 426 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 427 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 428 | ipv6_hdr(skb)->payload_len) |
b0366486 | 429 | goto bad; |
1da177e4 LT |
430 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
431 | goto bad; | |
b0366486 | 432 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 433 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 434 | goto bad; |
d56f90a7 | 435 | nh = skb_network_header(skb); |
1da177e4 LT |
436 | break; |
437 | default: | |
438 | if (optlen > len) | |
439 | goto bad; | |
440 | break; | |
441 | } | |
442 | off += optlen; | |
443 | len -= optlen; | |
444 | } | |
445 | if (len == 0) | |
446 | return 0; | |
447 | bad: | |
448 | return -1; | |
449 | ||
450 | } | |
451 | ||
452 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
453 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
454 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
455 | struct sk_buff *skb, |
456 | const struct net_device *in, | |
457 | const struct net_device *out, | |
458 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
459 | { |
460 | struct ipv6hdr *hdr; | |
461 | u32 pkt_len; | |
1da177e4 LT |
462 | |
463 | if (skb->len < sizeof(struct ipv6hdr)) | |
464 | goto inhdr_error; | |
465 | ||
466 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
467 | goto inhdr_error; | |
468 | ||
0660e03f | 469 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
470 | |
471 | if (hdr->version != 6) | |
472 | goto inhdr_error; | |
473 | ||
474 | pkt_len = ntohs(hdr->payload_len); | |
475 | ||
476 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
477 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
478 | goto inhdr_error; | |
b38dfee3 HX |
479 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
480 | goto inhdr_error; | |
1da177e4 LT |
481 | } |
482 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 483 | goto inhdr_error; |
1da177e4 | 484 | |
789bc3e5 | 485 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 486 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 487 | return NF_DROP; |
5dce971a SH |
488 | if (!setup_pre_routing(skb)) |
489 | return NF_DROP; | |
1da177e4 LT |
490 | |
491 | NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL, | |
492 | br_nf_pre_routing_finish_ipv6); | |
493 | ||
494 | return NF_STOLEN; | |
495 | ||
496 | inhdr_error: | |
497 | return NF_DROP; | |
498 | } | |
499 | ||
500 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
501 | * Replicate the checks that IPv4 does on packet reception. | |
502 | * Set skb->dev to the bridge device (i.e. parent of the | |
503 | * receiving device) to make netfilter happy, the REDIRECT | |
504 | * target in particular. Save the original destination IP | |
505 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 506 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
507 | const struct net_device *in, |
508 | const struct net_device *out, | |
509 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
510 | { |
511 | struct iphdr *iph; | |
e7c243c9 EP |
512 | __u32 len = nf_bridge_encap_header_len(skb); |
513 | ||
e7c243c9 EP |
514 | if (unlikely(!pskb_may_pull(skb, len))) |
515 | goto out; | |
1da177e4 | 516 | |
516299d2 MM |
517 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
518 | IS_PPPOE_IPV6(skb)) { | |
1da177e4 LT |
519 | #ifdef CONFIG_SYSCTL |
520 | if (!brnf_call_ip6tables) | |
521 | return NF_ACCEPT; | |
522 | #endif | |
fc38582d | 523 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
524 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
525 | } | |
526 | #ifdef CONFIG_SYSCTL | |
527 | if (!brnf_call_iptables) | |
528 | return NF_ACCEPT; | |
529 | #endif | |
530 | ||
516299d2 MM |
531 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
532 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
533 | return NF_ACCEPT; |
534 | ||
fc38582d | 535 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
536 | |
537 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
538 | goto inhdr_error; | |
539 | ||
eddc9ec5 | 540 | iph = ip_hdr(skb); |
1da177e4 LT |
541 | if (iph->ihl < 5 || iph->version != 4) |
542 | goto inhdr_error; | |
543 | ||
789bc3e5 | 544 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
545 | goto inhdr_error; |
546 | ||
eddc9ec5 | 547 | iph = ip_hdr(skb); |
789bc3e5 | 548 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
549 | goto inhdr_error; |
550 | ||
551 | len = ntohs(iph->tot_len); | |
789bc3e5 | 552 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
553 | goto inhdr_error; |
554 | ||
b38dfee3 | 555 | pskb_trim_rcsum(skb, len); |
1da177e4 | 556 | |
789bc3e5 | 557 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 558 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 559 | return NF_DROP; |
5dce971a SH |
560 | if (!setup_pre_routing(skb)) |
561 | return NF_DROP; | |
1da177e4 LT |
562 | store_orig_dstaddr(skb); |
563 | ||
564 | NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL, | |
565 | br_nf_pre_routing_finish); | |
566 | ||
567 | return NF_STOLEN; | |
568 | ||
569 | inhdr_error: | |
789bc3e5 | 570 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
571 | out: |
572 | return NF_DROP; | |
573 | } | |
574 | ||
575 | ||
576 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
577 | /* The packet is locally destined, which requires a real | |
578 | * dst_entry, so detach the fake one. On the way up, the | |
579 | * packet would pass through PRE_ROUTING again (which already | |
580 | * took place when the packet entered the bridge), but we | |
581 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
582 | * prevent this from happening. */ | |
3db05fea | 583 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
584 | const struct net_device *in, |
585 | const struct net_device *out, | |
586 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 587 | { |
1da177e4 LT |
588 | if (skb->dst == (struct dst_entry *)&__fake_rtable) { |
589 | dst_release(skb->dst); | |
590 | skb->dst = NULL; | |
591 | } | |
592 | ||
593 | return NF_ACCEPT; | |
594 | } | |
595 | ||
1da177e4 LT |
596 | /* PF_BRIDGE/FORWARD *************************************************/ |
597 | static int br_nf_forward_finish(struct sk_buff *skb) | |
598 | { | |
599 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
600 | struct net_device *in; | |
1da177e4 | 601 | |
8b42ec39 | 602 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
603 | in = nf_bridge->physindev; |
604 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
605 | skb->pkt_type = PACKET_OTHERHOST; | |
606 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
607 | } | |
608 | } else { | |
609 | in = *((struct net_device **)(skb->cb)); | |
610 | } | |
fc38582d | 611 | nf_bridge_push_encap_header(skb); |
1da177e4 | 612 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 613 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
614 | return 0; |
615 | } | |
616 | ||
617 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
618 | * netfilter with indev and outdev set to the bridge device, | |
619 | * but we are still able to filter on the 'real' indev/outdev | |
620 | * because of the physdev module. For ARP, indev and outdev are the | |
621 | * bridge ports. */ | |
3db05fea | 622 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
623 | const struct net_device *in, |
624 | const struct net_device *out, | |
625 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 626 | { |
1da177e4 | 627 | struct nf_bridge_info *nf_bridge; |
5dce971a | 628 | struct net_device *parent; |
1da177e4 LT |
629 | int pf; |
630 | ||
631 | if (!skb->nf_bridge) | |
632 | return NF_ACCEPT; | |
633 | ||
5dce971a SH |
634 | parent = bridge_parent(out); |
635 | if (!parent) | |
636 | return NF_DROP; | |
637 | ||
516299d2 MM |
638 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
639 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
640 | pf = PF_INET; |
641 | else | |
642 | pf = PF_INET6; | |
643 | ||
3db05fea | 644 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 645 | |
1da177e4 LT |
646 | nf_bridge = skb->nf_bridge; |
647 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
648 | skb->pkt_type = PACKET_HOST; | |
649 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
650 | } | |
651 | ||
652 | /* The physdev module checks on this */ | |
653 | nf_bridge->mask |= BRNF_BRIDGED; | |
654 | nf_bridge->physoutdev = skb->dev; | |
655 | ||
5dce971a SH |
656 | NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), parent, |
657 | br_nf_forward_finish); | |
1da177e4 LT |
658 | |
659 | return NF_STOLEN; | |
660 | } | |
661 | ||
3db05fea | 662 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
663 | const struct net_device *in, |
664 | const struct net_device *out, | |
665 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 666 | { |
1da177e4 LT |
667 | struct net_device **d = (struct net_device **)(skb->cb); |
668 | ||
669 | #ifdef CONFIG_SYSCTL | |
670 | if (!brnf_call_arptables) | |
671 | return NF_ACCEPT; | |
672 | #endif | |
673 | ||
f8a26028 | 674 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 675 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 676 | return NF_ACCEPT; |
3db05fea | 677 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
678 | } |
679 | ||
d0a92be0 | 680 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 681 | if (IS_VLAN_ARP(skb)) |
3db05fea | 682 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
683 | return NF_ACCEPT; |
684 | } | |
685 | *d = (struct net_device *)in; | |
686 | NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, | |
687 | (struct net_device *)out, br_nf_forward_finish); | |
688 | ||
689 | return NF_STOLEN; | |
690 | } | |
691 | ||
2bf540b7 PM |
692 | /* PF_BRIDGE/LOCAL_OUT *********************************************** |
693 | * | |
694 | * This function sees both locally originated IP packets and forwarded | |
1da177e4 LT |
695 | * IP packets (in both cases the destination device is a bridge |
696 | * device). It also sees bridged-and-DNAT'ed packets. | |
1da177e4 LT |
697 | * |
698 | * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged | |
699 | * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() | |
700 | * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority | |
701 | * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor | |
702 | * will be executed. | |
2bf540b7 | 703 | */ |
3db05fea | 704 | static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
705 | const struct net_device *in, |
706 | const struct net_device *out, | |
707 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 708 | { |
2bf540b7 | 709 | struct net_device *realindev; |
1da177e4 | 710 | struct nf_bridge_info *nf_bridge; |
1da177e4 LT |
711 | |
712 | if (!skb->nf_bridge) | |
713 | return NF_ACCEPT; | |
714 | ||
1da177e4 | 715 | nf_bridge = skb->nf_bridge; |
2bf540b7 PM |
716 | if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT)) |
717 | return NF_ACCEPT; | |
1da177e4 LT |
718 | |
719 | /* Bridged, take PF_BRIDGE/FORWARD. | |
720 | * (see big note in front of br_nf_pre_routing_finish) */ | |
2bf540b7 PM |
721 | nf_bridge->physoutdev = skb->dev; |
722 | realindev = nf_bridge->physindev; | |
1da177e4 | 723 | |
2bf540b7 PM |
724 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
725 | skb->pkt_type = PACKET_OTHERHOST; | |
726 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
1da177e4 | 727 | } |
fc38582d | 728 | nf_bridge_push_encap_header(skb); |
1da177e4 | 729 | |
2bf540b7 PM |
730 | NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev, |
731 | br_forward_finish); | |
1da177e4 LT |
732 | return NF_STOLEN; |
733 | } | |
734 | ||
2e2f7aef PM |
735 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
736 | { | |
737 | if (skb->protocol == htons(ETH_P_IP) && | |
738 | skb->len > skb->dev->mtu && | |
89114afd | 739 | !skb_is_gso(skb)) |
2e2f7aef PM |
740 | return ip_fragment(skb, br_dev_queue_push_xmit); |
741 | else | |
742 | return br_dev_queue_push_xmit(skb); | |
743 | } | |
1da177e4 LT |
744 | |
745 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 746 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
747 | const struct net_device *in, |
748 | const struct net_device *out, | |
749 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 750 | { |
3db05fea | 751 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 LT |
752 | struct net_device *realoutdev = bridge_parent(skb->dev); |
753 | int pf; | |
754 | ||
755 | #ifdef CONFIG_NETFILTER_DEBUG | |
756 | /* Be very paranoid. This probably won't happen anymore, but let's | |
757 | * keep the check just to be sure... */ | |
98e399f8 ACM |
758 | if (skb_mac_header(skb) < skb->head || |
759 | skb_mac_header(skb) + ETH_HLEN > skb->data) { | |
1da177e4 | 760 | printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " |
8394e9b2 | 761 | "bad mac.raw pointer.\n"); |
1da177e4 LT |
762 | goto print_error; |
763 | } | |
764 | #endif | |
765 | ||
766 | if (!nf_bridge) | |
767 | return NF_ACCEPT; | |
768 | ||
5dce971a SH |
769 | if (!realoutdev) |
770 | return NF_DROP; | |
771 | ||
516299d2 MM |
772 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
773 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
774 | pf = PF_INET; |
775 | else | |
776 | pf = PF_INET6; | |
777 | ||
778 | #ifdef CONFIG_NETFILTER_DEBUG | |
779 | if (skb->dst == NULL) { | |
8394e9b2 | 780 | printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL\n"); |
1da177e4 LT |
781 | goto print_error; |
782 | } | |
1da177e4 LT |
783 | #endif |
784 | ||
785 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
786 | * about the value of skb->pkt_type. */ | |
787 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
788 | skb->pkt_type = PACKET_HOST; | |
789 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
790 | } | |
791 | ||
fc38582d | 792 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
793 | nf_bridge_save_header(skb); |
794 | ||
795 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
796 | if (nf_bridge->netoutdev) | |
797 | realoutdev = nf_bridge->netoutdev; | |
798 | #endif | |
799 | NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev, | |
2e2f7aef | 800 | br_nf_dev_queue_xmit); |
1da177e4 LT |
801 | |
802 | return NF_STOLEN; | |
803 | ||
804 | #ifdef CONFIG_NETFILTER_DEBUG | |
805 | print_error: | |
806 | if (skb->dev != NULL) { | |
807 | printk("[%s]", skb->dev->name); | |
178a3259 SH |
808 | if (realoutdev) |
809 | printk("[%s]", realoutdev->name); | |
1da177e4 | 810 | } |
98e399f8 | 811 | printk(" head:%p, raw:%p, data:%p\n", skb->head, skb_mac_header(skb), |
789bc3e5 | 812 | skb->data); |
8394e9b2 | 813 | dump_stack(); |
1da177e4 LT |
814 | return NF_ACCEPT; |
815 | #endif | |
816 | } | |
817 | ||
1da177e4 LT |
818 | /* IP/SABOTAGE *****************************************************/ |
819 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
820 | * for the second time. */ | |
3db05fea | 821 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
822 | const struct net_device *in, |
823 | const struct net_device *out, | |
824 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 825 | { |
3db05fea HX |
826 | if (skb->nf_bridge && |
827 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
828 | return NF_STOP; |
829 | } | |
830 | ||
831 | return NF_ACCEPT; | |
832 | } | |
833 | ||
1da177e4 LT |
834 | /* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent |
835 | * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. | |
836 | * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
837 | * ip_refrag() can return NF_STOLEN. */ | |
838 | static struct nf_hook_ops br_nf_ops[] = { | |
9d6f229f YH |
839 | { .hook = br_nf_pre_routing, |
840 | .owner = THIS_MODULE, | |
841 | .pf = PF_BRIDGE, | |
842 | .hooknum = NF_BR_PRE_ROUTING, | |
1da177e4 LT |
843 | .priority = NF_BR_PRI_BRNF, }, |
844 | { .hook = br_nf_local_in, | |
845 | .owner = THIS_MODULE, | |
846 | .pf = PF_BRIDGE, | |
847 | .hooknum = NF_BR_LOCAL_IN, | |
848 | .priority = NF_BR_PRI_BRNF, }, | |
849 | { .hook = br_nf_forward_ip, | |
850 | .owner = THIS_MODULE, | |
851 | .pf = PF_BRIDGE, | |
852 | .hooknum = NF_BR_FORWARD, | |
853 | .priority = NF_BR_PRI_BRNF - 1, }, | |
854 | { .hook = br_nf_forward_arp, | |
855 | .owner = THIS_MODULE, | |
856 | .pf = PF_BRIDGE, | |
857 | .hooknum = NF_BR_FORWARD, | |
858 | .priority = NF_BR_PRI_BRNF, }, | |
859 | { .hook = br_nf_local_out, | |
860 | .owner = THIS_MODULE, | |
861 | .pf = PF_BRIDGE, | |
862 | .hooknum = NF_BR_LOCAL_OUT, | |
863 | .priority = NF_BR_PRI_FIRST, }, | |
864 | { .hook = br_nf_post_routing, | |
865 | .owner = THIS_MODULE, | |
866 | .pf = PF_BRIDGE, | |
867 | .hooknum = NF_BR_POST_ROUTING, | |
868 | .priority = NF_BR_PRI_LAST, }, | |
869 | { .hook = ip_sabotage_in, | |
870 | .owner = THIS_MODULE, | |
871 | .pf = PF_INET, | |
872 | .hooknum = NF_IP_PRE_ROUTING, | |
873 | .priority = NF_IP_PRI_FIRST, }, | |
874 | { .hook = ip_sabotage_in, | |
875 | .owner = THIS_MODULE, | |
876 | .pf = PF_INET6, | |
877 | .hooknum = NF_IP6_PRE_ROUTING, | |
878 | .priority = NF_IP6_PRI_FIRST, }, | |
1da177e4 LT |
879 | }; |
880 | ||
881 | #ifdef CONFIG_SYSCTL | |
882 | static | |
789bc3e5 SH |
883 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp, |
884 | void __user * buffer, size_t * lenp, loff_t * ppos) | |
1da177e4 LT |
885 | { |
886 | int ret; | |
887 | ||
888 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
889 | ||
890 | if (write && *(int *)(ctl->data)) | |
891 | *(int *)(ctl->data) = 1; | |
892 | return ret; | |
893 | } | |
894 | ||
895 | static ctl_table brnf_table[] = { | |
896 | { | |
1da177e4 LT |
897 | .procname = "bridge-nf-call-arptables", |
898 | .data = &brnf_call_arptables, | |
899 | .maxlen = sizeof(int), | |
900 | .mode = 0644, | |
901 | .proc_handler = &brnf_sysctl_call_tables, | |
902 | }, | |
903 | { | |
1da177e4 LT |
904 | .procname = "bridge-nf-call-iptables", |
905 | .data = &brnf_call_iptables, | |
906 | .maxlen = sizeof(int), | |
907 | .mode = 0644, | |
908 | .proc_handler = &brnf_sysctl_call_tables, | |
909 | }, | |
910 | { | |
1da177e4 LT |
911 | .procname = "bridge-nf-call-ip6tables", |
912 | .data = &brnf_call_ip6tables, | |
913 | .maxlen = sizeof(int), | |
914 | .mode = 0644, | |
915 | .proc_handler = &brnf_sysctl_call_tables, | |
916 | }, | |
917 | { | |
1da177e4 LT |
918 | .procname = "bridge-nf-filter-vlan-tagged", |
919 | .data = &brnf_filter_vlan_tagged, | |
920 | .maxlen = sizeof(int), | |
921 | .mode = 0644, | |
922 | .proc_handler = &brnf_sysctl_call_tables, | |
516299d2 MM |
923 | }, |
924 | { | |
516299d2 MM |
925 | .procname = "bridge-nf-filter-pppoe-tagged", |
926 | .data = &brnf_filter_pppoe_tagged, | |
927 | .maxlen = sizeof(int), | |
928 | .mode = 0644, | |
929 | .proc_handler = &brnf_sysctl_call_tables, | |
1da177e4 LT |
930 | }, |
931 | { .ctl_name = 0 } | |
932 | }; | |
933 | ||
934 | static ctl_table brnf_bridge_table[] = { | |
935 | { | |
936 | .ctl_name = NET_BRIDGE, | |
937 | .procname = "bridge", | |
938 | .mode = 0555, | |
939 | .child = brnf_table, | |
940 | }, | |
941 | { .ctl_name = 0 } | |
942 | }; | |
943 | ||
944 | static ctl_table brnf_net_table[] = { | |
945 | { | |
946 | .ctl_name = CTL_NET, | |
947 | .procname = "net", | |
948 | .mode = 0555, | |
949 | .child = brnf_bridge_table, | |
950 | }, | |
951 | { .ctl_name = 0 } | |
952 | }; | |
953 | #endif | |
954 | ||
5eb87f45 | 955 | int __init br_netfilter_init(void) |
1da177e4 | 956 | { |
5eb87f45 | 957 | int ret; |
1da177e4 | 958 | |
5eb87f45 PM |
959 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
960 | if (ret < 0) | |
1da177e4 | 961 | return ret; |
1da177e4 | 962 | #ifdef CONFIG_SYSCTL |
0b4d4147 | 963 | brnf_sysctl_header = register_sysctl_table(brnf_net_table); |
1da177e4 | 964 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
965 | printk(KERN_WARNING |
966 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 PM |
967 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
968 | return -ENOMEM; | |
1da177e4 LT |
969 | } |
970 | #endif | |
1da177e4 | 971 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
972 | return 0; |
973 | } | |
974 | ||
975 | void br_netfilter_fini(void) | |
976 | { | |
5eb87f45 | 977 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
978 | #ifdef CONFIG_SYSCTL |
979 | unregister_sysctl_table(brnf_sysctl_header); | |
980 | #endif | |
981 | } |