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> | |
32 | #include <linux/netfilter_bridge.h> | |
33 | #include <linux/netfilter_ipv4.h> | |
34 | #include <linux/netfilter_ipv6.h> | |
35 | #include <linux/netfilter_arp.h> | |
36 | #include <linux/in_route.h> | |
f216f082 | 37 | #include <linux/inetdevice.h> |
14c85021 | 38 | |
1da177e4 LT |
39 | #include <net/ip.h> |
40 | #include <net/ipv6.h> | |
14c85021 ACM |
41 | #include <net/route.h> |
42 | ||
1da177e4 | 43 | #include <asm/uaccess.h> |
1da177e4 LT |
44 | #include "br_private.h" |
45 | #ifdef CONFIG_SYSCTL | |
46 | #include <linux/sysctl.h> | |
47 | #endif | |
48 | ||
49 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
50 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
51 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
52 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 53 | |
1da177e4 LT |
54 | #ifdef CONFIG_SYSCTL |
55 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
56 | static int brnf_call_iptables __read_mostly = 1; |
57 | static int brnf_call_ip6tables __read_mostly = 1; | |
58 | static int brnf_call_arptables __read_mostly = 1; | |
59 | static int brnf_filter_vlan_tagged __read_mostly = 1; | |
1da177e4 LT |
60 | #else |
61 | #define brnf_filter_vlan_tagged 1 | |
62 | #endif | |
63 | ||
b6f99a21 | 64 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 SH |
65 | { |
66 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
67 | } | |
68 | ||
69 | #define IS_VLAN_IP(skb) \ | |
70 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
9d6f229f | 71 | vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
72 | brnf_filter_vlan_tagged) |
73 | ||
74 | #define IS_VLAN_IPV6(skb) \ | |
75 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
76 | vlan_proto(skb) == htons(ETH_P_IPV6) &&\ | |
77 | brnf_filter_vlan_tagged) | |
78 | ||
79 | #define IS_VLAN_ARP(skb) \ | |
80 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
81 | vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
82 | brnf_filter_vlan_tagged) | |
1da177e4 LT |
83 | |
84 | /* We need these fake structures to make netfilter happy -- | |
85 | * lots of places assume that skb->dst != NULL, which isn't | |
86 | * all that unreasonable. | |
87 | * | |
88 | * Currently, we fill in the PMTU entry because netfilter | |
89 | * refragmentation needs it, and the rt_flags entry because | |
90 | * ipt_REJECT needs it. Future netfilter modules might | |
91 | * require us to fill additional fields. */ | |
92 | static struct net_device __fake_net_device = { | |
93 | .hard_header_len = ETH_HLEN | |
94 | }; | |
95 | ||
96 | static struct rtable __fake_rtable = { | |
97 | .u = { | |
98 | .dst = { | |
99 | .__refcnt = ATOMIC_INIT(1), | |
100 | .dev = &__fake_net_device, | |
101 | .path = &__fake_rtable.u.dst, | |
102 | .metrics = {[RTAX_MTU - 1] = 1500}, | |
42cf93cd | 103 | .flags = DST_NOXFRM, |
1da177e4 LT |
104 | } |
105 | }, | |
106 | .rt_flags = 0, | |
107 | }; | |
108 | ||
5dce971a SH |
109 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
110 | { | |
111 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
112 | ||
113 | return port ? port->br->dev : NULL; | |
114 | } | |
1da177e4 | 115 | |
fdeabdef SH |
116 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
117 | { | |
118 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
119 | if (likely(skb->nf_bridge)) | |
120 | atomic_set(&(skb->nf_bridge->use), 1); | |
121 | ||
122 | return skb->nf_bridge; | |
123 | } | |
124 | ||
125 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
126 | { | |
9d6f229f | 127 | int header_size = ETH_HLEN; |
fdeabdef SH |
128 | |
129 | if (skb->protocol == htons(ETH_P_8021Q)) | |
07317621 | 130 | header_size += VLAN_HLEN; |
fdeabdef | 131 | |
d626f62b ACM |
132 | skb_copy_from_linear_data_offset(skb, -header_size, |
133 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
134 | } |
135 | ||
07317621 SH |
136 | /* |
137 | * When forwarding bridge frames, we save a copy of the original | |
138 | * header before processing. | |
139 | */ | |
140 | int nf_bridge_copy_header(struct sk_buff *skb) | |
141 | { | |
142 | int err; | |
9d6f229f | 143 | int header_size = ETH_HLEN; |
07317621 SH |
144 | |
145 | if (skb->protocol == htons(ETH_P_8021Q)) | |
146 | header_size += VLAN_HLEN; | |
147 | ||
148 | err = skb_cow(skb, header_size); | |
149 | if (err) | |
150 | return err; | |
151 | ||
27d7ff46 ACM |
152 | skb_copy_to_linear_data_offset(skb, -header_size, |
153 | skb->nf_bridge->data, header_size); | |
07317621 SH |
154 | |
155 | if (skb->protocol == htons(ETH_P_8021Q)) | |
156 | __skb_push(skb, VLAN_HLEN); | |
157 | return 0; | |
158 | } | |
159 | ||
1da177e4 LT |
160 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
161 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
162 | * bridge PRE_ROUTING hook. */ | |
163 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
164 | { | |
165 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
166 | ||
1da177e4 LT |
167 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
168 | skb->pkt_type = PACKET_OTHERHOST; | |
169 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
170 | } | |
171 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
172 | ||
173 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
174 | dst_hold(skb->dst); | |
175 | ||
176 | skb->dev = nf_bridge->physindev; | |
f8a26028 | 177 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 178 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 179 | skb->network_header -= VLAN_HLEN; |
1da177e4 LT |
180 | } |
181 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
182 | br_handle_frame_finish, 1); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static void __br_dnat_complain(void) | |
188 | { | |
189 | static unsigned long last_complaint; | |
190 | ||
191 | if (jiffies - last_complaint >= 5 * HZ) { | |
192 | printk(KERN_WARNING "Performing cross-bridge DNAT requires IP " | |
789bc3e5 | 193 | "forwarding to be enabled\n"); |
1da177e4 LT |
194 | last_complaint = jiffies; |
195 | } | |
196 | } | |
197 | ||
198 | /* This requires some explaining. If DNAT has taken place, | |
199 | * we will need to fix up the destination Ethernet address, | |
200 | * and this is a tricky process. | |
201 | * | |
202 | * There are two cases to consider: | |
203 | * 1. The packet was DNAT'ed to a device in the same bridge | |
204 | * port group as it was received on. We can still bridge | |
205 | * the packet. | |
206 | * 2. The packet was DNAT'ed to a different device, either | |
207 | * a non-bridged device or another bridge port group. | |
208 | * The packet will need to be routed. | |
209 | * | |
210 | * The correct way of distinguishing between these two cases is to | |
211 | * call ip_route_input() and to look at skb->dst->dev, which is | |
212 | * changed to the destination device if ip_route_input() succeeds. | |
213 | * | |
214 | * Let us first consider the case that ip_route_input() succeeds: | |
215 | * | |
216 | * If skb->dst->dev equals the logical bridge device the packet | |
217 | * came in on, we can consider this bridging. We then call | |
218 | * skb->dst->output() which will make the packet enter br_nf_local_out() | |
219 | * not much later. In that function it is assured that the iptables | |
220 | * FORWARD chain is traversed for the packet. | |
221 | * | |
222 | * Otherwise, the packet is considered to be routed and we just | |
223 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
224 | * later be passed up to the IP stack to be routed. For a redirected |
225 | * packet, ip_route_input() will give back the localhost as output device, | |
226 | * which differs from the bridge device. | |
1da177e4 LT |
227 | * |
228 | * Let us now consider the case that ip_route_input() fails: | |
229 | * | |
f216f082 BDS |
230 | * This can be because the destination address is martian, in which case |
231 | * the packet will be dropped. | |
1da177e4 LT |
232 | * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input() |
233 | * will fail, while __ip_route_output_key() will return success. The source | |
234 | * address for __ip_route_output_key() is set to zero, so __ip_route_output_key | |
235 | * thinks we're handling a locally generated packet and won't care | |
236 | * if IP forwarding is allowed. We send a warning message to the users's | |
237 | * log telling her to put IP forwarding on. | |
238 | * | |
239 | * ip_route_input() will also fail if there is no route available. | |
240 | * In that case we just drop the packet. | |
241 | * | |
242 | * --Lennert, 20020411 | |
243 | * --Bart, 20020416 (updated) | |
f216f082 BDS |
244 | * --Bart, 20021007 (updated) |
245 | * --Bart, 20062711 (updated) */ | |
1da177e4 LT |
246 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
247 | { | |
1da177e4 LT |
248 | if (skb->pkt_type == PACKET_OTHERHOST) { |
249 | skb->pkt_type = PACKET_HOST; | |
250 | skb->nf_bridge->mask |= BRNF_PKT_TYPE; | |
251 | } | |
252 | skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
253 | ||
254 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
255 | if (!skb->dev) |
256 | kfree_skb(skb); | |
257 | else { | |
f8a26028 | 258 | if (skb->protocol == htons(ETH_P_8021Q)) { |
5dce971a | 259 | skb_pull(skb, VLAN_HLEN); |
b0e380b1 | 260 | skb->network_header += VLAN_HLEN; |
5dce971a SH |
261 | } |
262 | skb->dst->output(skb); | |
1da177e4 | 263 | } |
1da177e4 LT |
264 | return 0; |
265 | } | |
266 | ||
267 | static int br_nf_pre_routing_finish(struct sk_buff *skb) | |
268 | { | |
269 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 270 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 271 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
f216f082 | 272 | int err; |
1da177e4 | 273 | |
1da177e4 LT |
274 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
275 | skb->pkt_type = PACKET_OTHERHOST; | |
276 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
277 | } | |
278 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 279 | if (dnat_took_place(skb)) { |
f216f082 | 280 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
1da177e4 | 281 | struct rtable *rt; |
789bc3e5 SH |
282 | struct flowi fl = { |
283 | .nl_u = { | |
284 | .ip4_u = { | |
285 | .daddr = iph->daddr, | |
286 | .saddr = 0, | |
287 | .tos = RT_TOS(iph->tos) }, | |
288 | }, | |
289 | .proto = 0, | |
290 | }; | |
f216f082 BDS |
291 | struct in_device *in_dev = in_dev_get(dev); |
292 | ||
293 | /* If err equals -EHOSTUNREACH the error is due to a | |
294 | * martian destination or due to the fact that | |
295 | * forwarding is disabled. For most martian packets, | |
296 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
297 | * martian destinations: loopback destinations and destination | |
298 | * 0.0.0.0. In both cases the packet will be dropped because the | |
299 | * destination is the loopback device and not the bridge. */ | |
300 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
301 | goto free_skb; | |
1da177e4 LT |
302 | |
303 | if (!ip_route_output_key(&rt, &fl)) { | |
1c011bed | 304 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
305 | * require ip_forwarding. */ |
306 | if (((struct dst_entry *)rt)->dev == dev) { | |
1da177e4 LT |
307 | skb->dst = (struct dst_entry *)rt; |
308 | goto bridged_dnat; | |
309 | } | |
f216f082 BDS |
310 | /* we are sure that forwarding is disabled, so printing |
311 | * this message is no problem. Note that the packet could | |
312 | * still have a martian destination address, in which case | |
313 | * the packet could be dropped even if forwarding were enabled */ | |
1da177e4 LT |
314 | __br_dnat_complain(); |
315 | dst_release((struct dst_entry *)rt); | |
316 | } | |
f216f082 | 317 | free_skb: |
1da177e4 LT |
318 | kfree_skb(skb); |
319 | return 0; | |
320 | } else { | |
321 | if (skb->dst->dev == dev) { | |
322 | bridged_dnat: | |
323 | /* Tell br_nf_local_out this is a | |
324 | * bridged frame */ | |
325 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
326 | skb->dev = nf_bridge->physindev; | |
327 | if (skb->protocol == | |
f8a26028 | 328 | htons(ETH_P_8021Q)) { |
1da177e4 | 329 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 330 | skb->network_header -= VLAN_HLEN; |
1da177e4 LT |
331 | } |
332 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, | |
333 | skb, skb->dev, NULL, | |
334 | br_nf_pre_routing_finish_bridge, | |
335 | 1); | |
336 | return 0; | |
337 | } | |
789bc3e5 | 338 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
339 | skb->pkt_type = PACKET_HOST; |
340 | } | |
341 | } else { | |
342 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
343 | dst_hold(skb->dst); | |
344 | } | |
345 | ||
346 | skb->dev = nf_bridge->physindev; | |
f8a26028 | 347 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 348 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 349 | skb->network_header -= VLAN_HLEN; |
1da177e4 LT |
350 | } |
351 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
352 | br_handle_frame_finish, 1); | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 358 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
359 | { |
360 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
361 | ||
362 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
363 | skb->pkt_type = PACKET_HOST; | |
364 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
365 | } | |
366 | ||
367 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
368 | nf_bridge->physindev = skb->dev; | |
369 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
370 | |
371 | return skb->dev; | |
1da177e4 LT |
372 | } |
373 | ||
374 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
375 | static int check_hbh_len(struct sk_buff *skb) | |
376 | { | |
0660e03f | 377 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 378 | u32 pkt_len; |
d56f90a7 ACM |
379 | const unsigned char *nh = skb_network_header(skb); |
380 | int off = raw - nh; | |
789bc3e5 | 381 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
382 | |
383 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
384 | goto bad; | |
385 | ||
386 | off += 2; | |
387 | len -= 2; | |
388 | ||
389 | while (len > 0) { | |
d56f90a7 | 390 | int optlen = nh[off + 1] + 2; |
1da177e4 | 391 | |
d56f90a7 | 392 | switch (nh[off]) { |
1da177e4 LT |
393 | case IPV6_TLV_PAD0: |
394 | optlen = 1; | |
395 | break; | |
396 | ||
397 | case IPV6_TLV_PADN: | |
398 | break; | |
399 | ||
400 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 401 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 402 | goto bad; |
d56f90a7 | 403 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 404 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 405 | ipv6_hdr(skb)->payload_len) |
b0366486 | 406 | goto bad; |
1da177e4 LT |
407 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
408 | goto bad; | |
b0366486 | 409 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 410 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 411 | goto bad; |
d56f90a7 | 412 | nh = skb_network_header(skb); |
1da177e4 LT |
413 | break; |
414 | default: | |
415 | if (optlen > len) | |
416 | goto bad; | |
417 | break; | |
418 | } | |
419 | off += optlen; | |
420 | len -= optlen; | |
421 | } | |
422 | if (len == 0) | |
423 | return 0; | |
424 | bad: | |
425 | return -1; | |
426 | ||
427 | } | |
428 | ||
429 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
430 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
431 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
432 | struct sk_buff *skb, |
433 | const struct net_device *in, | |
434 | const struct net_device *out, | |
435 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
436 | { |
437 | struct ipv6hdr *hdr; | |
438 | u32 pkt_len; | |
1da177e4 LT |
439 | |
440 | if (skb->len < sizeof(struct ipv6hdr)) | |
441 | goto inhdr_error; | |
442 | ||
443 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
444 | goto inhdr_error; | |
445 | ||
0660e03f | 446 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
447 | |
448 | if (hdr->version != 6) | |
449 | goto inhdr_error; | |
450 | ||
451 | pkt_len = ntohs(hdr->payload_len); | |
452 | ||
453 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
454 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
455 | goto inhdr_error; | |
b38dfee3 HX |
456 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
457 | goto inhdr_error; | |
1da177e4 LT |
458 | } |
459 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 460 | goto inhdr_error; |
1da177e4 | 461 | |
789bc3e5 | 462 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 463 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 464 | return NF_DROP; |
5dce971a SH |
465 | if (!setup_pre_routing(skb)) |
466 | return NF_DROP; | |
1da177e4 LT |
467 | |
468 | NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL, | |
469 | br_nf_pre_routing_finish_ipv6); | |
470 | ||
471 | return NF_STOLEN; | |
472 | ||
473 | inhdr_error: | |
474 | return NF_DROP; | |
475 | } | |
476 | ||
477 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
478 | * Replicate the checks that IPv4 does on packet reception. | |
479 | * Set skb->dev to the bridge device (i.e. parent of the | |
480 | * receiving device) to make netfilter happy, the REDIRECT | |
481 | * target in particular. Save the original destination IP | |
482 | * address to be able to detect DNAT afterwards. */ | |
483 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, | |
ee02b3a6 SH |
484 | const struct net_device *in, |
485 | const struct net_device *out, | |
486 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
487 | { |
488 | struct iphdr *iph; | |
489 | __u32 len; | |
490 | struct sk_buff *skb = *pskb; | |
1da177e4 | 491 | |
8b42ec39 | 492 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb)) { |
1da177e4 LT |
493 | #ifdef CONFIG_SYSCTL |
494 | if (!brnf_call_ip6tables) | |
495 | return NF_ACCEPT; | |
496 | #endif | |
497 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
498 | goto out; | |
499 | ||
f8a26028 | 500 | if (skb->protocol == htons(ETH_P_8021Q)) { |
cbb042f9 | 501 | skb_pull_rcsum(skb, VLAN_HLEN); |
b0e380b1 | 502 | skb->network_header += VLAN_HLEN; |
1da177e4 LT |
503 | } |
504 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); | |
505 | } | |
506 | #ifdef CONFIG_SYSCTL | |
507 | if (!brnf_call_iptables) | |
508 | return NF_ACCEPT; | |
509 | #endif | |
510 | ||
8b42ec39 | 511 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb)) |
1da177e4 LT |
512 | return NF_ACCEPT; |
513 | ||
514 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
515 | goto out; | |
516 | ||
f8a26028 | 517 | if (skb->protocol == htons(ETH_P_8021Q)) { |
cbb042f9 | 518 | skb_pull_rcsum(skb, VLAN_HLEN); |
b0e380b1 | 519 | skb->network_header += VLAN_HLEN; |
1da177e4 LT |
520 | } |
521 | ||
522 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
523 | goto inhdr_error; | |
524 | ||
eddc9ec5 | 525 | iph = ip_hdr(skb); |
1da177e4 LT |
526 | if (iph->ihl < 5 || iph->version != 4) |
527 | goto inhdr_error; | |
528 | ||
789bc3e5 | 529 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
530 | goto inhdr_error; |
531 | ||
eddc9ec5 | 532 | iph = ip_hdr(skb); |
789bc3e5 | 533 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
534 | goto inhdr_error; |
535 | ||
536 | len = ntohs(iph->tot_len); | |
789bc3e5 | 537 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
538 | goto inhdr_error; |
539 | ||
b38dfee3 | 540 | pskb_trim_rcsum(skb, len); |
1da177e4 | 541 | |
789bc3e5 | 542 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 543 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 544 | return NF_DROP; |
5dce971a SH |
545 | if (!setup_pre_routing(skb)) |
546 | return NF_DROP; | |
1da177e4 LT |
547 | store_orig_dstaddr(skb); |
548 | ||
549 | NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL, | |
550 | br_nf_pre_routing_finish); | |
551 | ||
552 | return NF_STOLEN; | |
553 | ||
554 | inhdr_error: | |
789bc3e5 | 555 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
556 | out: |
557 | return NF_DROP; | |
558 | } | |
559 | ||
560 | ||
561 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
562 | /* The packet is locally destined, which requires a real | |
563 | * dst_entry, so detach the fake one. On the way up, the | |
564 | * packet would pass through PRE_ROUTING again (which already | |
565 | * took place when the packet entered the bridge), but we | |
566 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
567 | * prevent this from happening. */ | |
568 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
569 | const struct net_device *in, |
570 | const struct net_device *out, | |
571 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
572 | { |
573 | struct sk_buff *skb = *pskb; | |
574 | ||
575 | if (skb->dst == (struct dst_entry *)&__fake_rtable) { | |
576 | dst_release(skb->dst); | |
577 | skb->dst = NULL; | |
578 | } | |
579 | ||
580 | return NF_ACCEPT; | |
581 | } | |
582 | ||
1da177e4 LT |
583 | /* PF_BRIDGE/FORWARD *************************************************/ |
584 | static int br_nf_forward_finish(struct sk_buff *skb) | |
585 | { | |
586 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
587 | struct net_device *in; | |
1da177e4 | 588 | |
8b42ec39 | 589 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
590 | in = nf_bridge->physindev; |
591 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
592 | skb->pkt_type = PACKET_OTHERHOST; | |
593 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
594 | } | |
595 | } else { | |
596 | in = *((struct net_device **)(skb->cb)); | |
597 | } | |
f8a26028 | 598 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 599 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 600 | skb->network_header -= VLAN_HLEN; |
1da177e4 LT |
601 | } |
602 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, | |
789bc3e5 | 603 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
604 | return 0; |
605 | } | |
606 | ||
607 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
608 | * netfilter with indev and outdev set to the bridge device, | |
609 | * but we are still able to filter on the 'real' indev/outdev | |
610 | * because of the physdev module. For ARP, indev and outdev are the | |
611 | * bridge ports. */ | |
612 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
613 | const struct net_device *in, |
614 | const struct net_device *out, | |
615 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
616 | { |
617 | struct sk_buff *skb = *pskb; | |
618 | struct nf_bridge_info *nf_bridge; | |
5dce971a | 619 | struct net_device *parent; |
1da177e4 LT |
620 | int pf; |
621 | ||
622 | if (!skb->nf_bridge) | |
623 | return NF_ACCEPT; | |
624 | ||
5dce971a SH |
625 | parent = bridge_parent(out); |
626 | if (!parent) | |
627 | return NF_DROP; | |
628 | ||
8b42ec39 | 629 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb)) |
1da177e4 LT |
630 | pf = PF_INET; |
631 | else | |
632 | pf = PF_INET6; | |
633 | ||
f8a26028 | 634 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 635 | skb_pull(*pskb, VLAN_HLEN); |
b0e380b1 | 636 | (*pskb)->network_header += VLAN_HLEN; |
1da177e4 LT |
637 | } |
638 | ||
1da177e4 LT |
639 | nf_bridge = skb->nf_bridge; |
640 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
641 | skb->pkt_type = PACKET_HOST; | |
642 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
643 | } | |
644 | ||
645 | /* The physdev module checks on this */ | |
646 | nf_bridge->mask |= BRNF_BRIDGED; | |
647 | nf_bridge->physoutdev = skb->dev; | |
648 | ||
5dce971a SH |
649 | NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), parent, |
650 | br_nf_forward_finish); | |
1da177e4 LT |
651 | |
652 | return NF_STOLEN; | |
653 | } | |
654 | ||
655 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
656 | const struct net_device *in, |
657 | const struct net_device *out, | |
658 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
659 | { |
660 | struct sk_buff *skb = *pskb; | |
1da177e4 LT |
661 | struct net_device **d = (struct net_device **)(skb->cb); |
662 | ||
663 | #ifdef CONFIG_SYSCTL | |
664 | if (!brnf_call_arptables) | |
665 | return NF_ACCEPT; | |
666 | #endif | |
667 | ||
f8a26028 | 668 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 669 | if (!IS_VLAN_ARP(skb)) |
1da177e4 LT |
670 | return NF_ACCEPT; |
671 | skb_pull(*pskb, VLAN_HLEN); | |
b0e380b1 | 672 | (*pskb)->network_header += VLAN_HLEN; |
1da177e4 LT |
673 | } |
674 | ||
d0a92be0 | 675 | if (arp_hdr(skb)->ar_pln != 4) { |
8b42ec39 | 676 | if (IS_VLAN_ARP(skb)) { |
1da177e4 | 677 | skb_push(*pskb, VLAN_HLEN); |
b0e380b1 | 678 | (*pskb)->network_header -= VLAN_HLEN; |
1da177e4 LT |
679 | } |
680 | return NF_ACCEPT; | |
681 | } | |
682 | *d = (struct net_device *)in; | |
683 | NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, | |
684 | (struct net_device *)out, br_nf_forward_finish); | |
685 | ||
686 | return NF_STOLEN; | |
687 | } | |
688 | ||
2bf540b7 PM |
689 | /* PF_BRIDGE/LOCAL_OUT *********************************************** |
690 | * | |
691 | * This function sees both locally originated IP packets and forwarded | |
1da177e4 LT |
692 | * IP packets (in both cases the destination device is a bridge |
693 | * device). It also sees bridged-and-DNAT'ed packets. | |
1da177e4 LT |
694 | * |
695 | * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged | |
696 | * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() | |
697 | * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority | |
698 | * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor | |
699 | * will be executed. | |
2bf540b7 | 700 | */ |
1da177e4 | 701 | static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb, |
789bc3e5 SH |
702 | const struct net_device *in, |
703 | const struct net_device *out, | |
704 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 705 | { |
2bf540b7 | 706 | struct net_device *realindev; |
1da177e4 LT |
707 | struct sk_buff *skb = *pskb; |
708 | struct nf_bridge_info *nf_bridge; | |
1da177e4 LT |
709 | |
710 | if (!skb->nf_bridge) | |
711 | return NF_ACCEPT; | |
712 | ||
1da177e4 | 713 | nf_bridge = skb->nf_bridge; |
2bf540b7 PM |
714 | if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT)) |
715 | return NF_ACCEPT; | |
1da177e4 LT |
716 | |
717 | /* Bridged, take PF_BRIDGE/FORWARD. | |
718 | * (see big note in front of br_nf_pre_routing_finish) */ | |
2bf540b7 PM |
719 | nf_bridge->physoutdev = skb->dev; |
720 | realindev = nf_bridge->physindev; | |
1da177e4 | 721 | |
2bf540b7 PM |
722 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
723 | skb->pkt_type = PACKET_OTHERHOST; | |
724 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
1da177e4 | 725 | } |
f8a26028 | 726 | if (skb->protocol == htons(ETH_P_8021Q)) { |
2bf540b7 | 727 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 728 | skb->network_header -= VLAN_HLEN; |
1da177e4 LT |
729 | } |
730 | ||
2bf540b7 PM |
731 | NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev, |
732 | br_forward_finish); | |
1da177e4 LT |
733 | return NF_STOLEN; |
734 | } | |
735 | ||
2e2f7aef PM |
736 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
737 | { | |
738 | if (skb->protocol == htons(ETH_P_IP) && | |
739 | skb->len > skb->dev->mtu && | |
89114afd | 740 | !skb_is_gso(skb)) |
2e2f7aef PM |
741 | return ip_fragment(skb, br_dev_queue_push_xmit); |
742 | else | |
743 | return br_dev_queue_push_xmit(skb); | |
744 | } | |
1da177e4 LT |
745 | |
746 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
747 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
748 | const struct net_device *in, |
749 | const struct net_device *out, | |
750 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
751 | { |
752 | struct sk_buff *skb = *pskb; | |
753 | struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge; | |
1da177e4 LT |
754 | struct net_device *realoutdev = bridge_parent(skb->dev); |
755 | int pf; | |
756 | ||
757 | #ifdef CONFIG_NETFILTER_DEBUG | |
758 | /* Be very paranoid. This probably won't happen anymore, but let's | |
759 | * keep the check just to be sure... */ | |
98e399f8 ACM |
760 | if (skb_mac_header(skb) < skb->head || |
761 | skb_mac_header(skb) + ETH_HLEN > skb->data) { | |
1da177e4 | 762 | printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " |
8394e9b2 | 763 | "bad mac.raw pointer.\n"); |
1da177e4 LT |
764 | goto print_error; |
765 | } | |
766 | #endif | |
767 | ||
768 | if (!nf_bridge) | |
769 | return NF_ACCEPT; | |
770 | ||
5dce971a SH |
771 | if (!realoutdev) |
772 | return NF_DROP; | |
773 | ||
8b42ec39 | 774 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb)) |
1da177e4 LT |
775 | pf = PF_INET; |
776 | else | |
777 | pf = PF_INET6; | |
778 | ||
779 | #ifdef CONFIG_NETFILTER_DEBUG | |
780 | if (skb->dst == NULL) { | |
8394e9b2 | 781 | printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL\n"); |
1da177e4 LT |
782 | goto print_error; |
783 | } | |
1da177e4 LT |
784 | #endif |
785 | ||
786 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
787 | * about the value of skb->pkt_type. */ | |
788 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
789 | skb->pkt_type = PACKET_HOST; | |
790 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
791 | } | |
792 | ||
f8a26028 | 793 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 794 | skb_pull(skb, VLAN_HLEN); |
b0e380b1 | 795 | skb->network_header += VLAN_HLEN; |
1da177e4 LT |
796 | } |
797 | ||
798 | nf_bridge_save_header(skb); | |
799 | ||
800 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
801 | if (nf_bridge->netoutdev) | |
802 | realoutdev = nf_bridge->netoutdev; | |
803 | #endif | |
804 | NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev, | |
2e2f7aef | 805 | br_nf_dev_queue_xmit); |
1da177e4 LT |
806 | |
807 | return NF_STOLEN; | |
808 | ||
809 | #ifdef CONFIG_NETFILTER_DEBUG | |
810 | print_error: | |
811 | if (skb->dev != NULL) { | |
812 | printk("[%s]", skb->dev->name); | |
178a3259 SH |
813 | if (realoutdev) |
814 | printk("[%s]", realoutdev->name); | |
1da177e4 | 815 | } |
98e399f8 | 816 | printk(" head:%p, raw:%p, data:%p\n", skb->head, skb_mac_header(skb), |
789bc3e5 | 817 | skb->data); |
8394e9b2 | 818 | dump_stack(); |
1da177e4 LT |
819 | return NF_ACCEPT; |
820 | #endif | |
821 | } | |
822 | ||
1da177e4 LT |
823 | /* IP/SABOTAGE *****************************************************/ |
824 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
825 | * for the second time. */ | |
826 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
827 | const struct net_device *in, |
828 | const struct net_device *out, | |
829 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
830 | { |
831 | if ((*pskb)->nf_bridge && | |
832 | !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
833 | return NF_STOP; | |
834 | } | |
835 | ||
836 | return NF_ACCEPT; | |
837 | } | |
838 | ||
1da177e4 LT |
839 | /* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent |
840 | * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. | |
841 | * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
842 | * ip_refrag() can return NF_STOLEN. */ | |
843 | static struct nf_hook_ops br_nf_ops[] = { | |
9d6f229f YH |
844 | { .hook = br_nf_pre_routing, |
845 | .owner = THIS_MODULE, | |
846 | .pf = PF_BRIDGE, | |
847 | .hooknum = NF_BR_PRE_ROUTING, | |
1da177e4 LT |
848 | .priority = NF_BR_PRI_BRNF, }, |
849 | { .hook = br_nf_local_in, | |
850 | .owner = THIS_MODULE, | |
851 | .pf = PF_BRIDGE, | |
852 | .hooknum = NF_BR_LOCAL_IN, | |
853 | .priority = NF_BR_PRI_BRNF, }, | |
854 | { .hook = br_nf_forward_ip, | |
855 | .owner = THIS_MODULE, | |
856 | .pf = PF_BRIDGE, | |
857 | .hooknum = NF_BR_FORWARD, | |
858 | .priority = NF_BR_PRI_BRNF - 1, }, | |
859 | { .hook = br_nf_forward_arp, | |
860 | .owner = THIS_MODULE, | |
861 | .pf = PF_BRIDGE, | |
862 | .hooknum = NF_BR_FORWARD, | |
863 | .priority = NF_BR_PRI_BRNF, }, | |
864 | { .hook = br_nf_local_out, | |
865 | .owner = THIS_MODULE, | |
866 | .pf = PF_BRIDGE, | |
867 | .hooknum = NF_BR_LOCAL_OUT, | |
868 | .priority = NF_BR_PRI_FIRST, }, | |
869 | { .hook = br_nf_post_routing, | |
870 | .owner = THIS_MODULE, | |
871 | .pf = PF_BRIDGE, | |
872 | .hooknum = NF_BR_POST_ROUTING, | |
873 | .priority = NF_BR_PRI_LAST, }, | |
874 | { .hook = ip_sabotage_in, | |
875 | .owner = THIS_MODULE, | |
876 | .pf = PF_INET, | |
877 | .hooknum = NF_IP_PRE_ROUTING, | |
878 | .priority = NF_IP_PRI_FIRST, }, | |
879 | { .hook = ip_sabotage_in, | |
880 | .owner = THIS_MODULE, | |
881 | .pf = PF_INET6, | |
882 | .hooknum = NF_IP6_PRE_ROUTING, | |
883 | .priority = NF_IP6_PRI_FIRST, }, | |
1da177e4 LT |
884 | }; |
885 | ||
886 | #ifdef CONFIG_SYSCTL | |
887 | static | |
789bc3e5 SH |
888 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp, |
889 | void __user * buffer, size_t * lenp, loff_t * ppos) | |
1da177e4 LT |
890 | { |
891 | int ret; | |
892 | ||
893 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
894 | ||
895 | if (write && *(int *)(ctl->data)) | |
896 | *(int *)(ctl->data) = 1; | |
897 | return ret; | |
898 | } | |
899 | ||
900 | static ctl_table brnf_table[] = { | |
901 | { | |
902 | .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES, | |
903 | .procname = "bridge-nf-call-arptables", | |
904 | .data = &brnf_call_arptables, | |
905 | .maxlen = sizeof(int), | |
906 | .mode = 0644, | |
907 | .proc_handler = &brnf_sysctl_call_tables, | |
908 | }, | |
909 | { | |
910 | .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES, | |
911 | .procname = "bridge-nf-call-iptables", | |
912 | .data = &brnf_call_iptables, | |
913 | .maxlen = sizeof(int), | |
914 | .mode = 0644, | |
915 | .proc_handler = &brnf_sysctl_call_tables, | |
916 | }, | |
917 | { | |
918 | .ctl_name = NET_BRIDGE_NF_CALL_IP6TABLES, | |
919 | .procname = "bridge-nf-call-ip6tables", | |
920 | .data = &brnf_call_ip6tables, | |
921 | .maxlen = sizeof(int), | |
922 | .mode = 0644, | |
923 | .proc_handler = &brnf_sysctl_call_tables, | |
924 | }, | |
925 | { | |
926 | .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED, | |
927 | .procname = "bridge-nf-filter-vlan-tagged", | |
928 | .data = &brnf_filter_vlan_tagged, | |
929 | .maxlen = sizeof(int), | |
930 | .mode = 0644, | |
931 | .proc_handler = &brnf_sysctl_call_tables, | |
932 | }, | |
933 | { .ctl_name = 0 } | |
934 | }; | |
935 | ||
936 | static ctl_table brnf_bridge_table[] = { | |
937 | { | |
938 | .ctl_name = NET_BRIDGE, | |
939 | .procname = "bridge", | |
940 | .mode = 0555, | |
941 | .child = brnf_table, | |
942 | }, | |
943 | { .ctl_name = 0 } | |
944 | }; | |
945 | ||
946 | static ctl_table brnf_net_table[] = { | |
947 | { | |
948 | .ctl_name = CTL_NET, | |
949 | .procname = "net", | |
950 | .mode = 0555, | |
951 | .child = brnf_bridge_table, | |
952 | }, | |
953 | { .ctl_name = 0 } | |
954 | }; | |
955 | #endif | |
956 | ||
5eb87f45 | 957 | int __init br_netfilter_init(void) |
1da177e4 | 958 | { |
5eb87f45 | 959 | int ret; |
1da177e4 | 960 | |
5eb87f45 PM |
961 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
962 | if (ret < 0) | |
1da177e4 | 963 | return ret; |
1da177e4 | 964 | #ifdef CONFIG_SYSCTL |
0b4d4147 | 965 | brnf_sysctl_header = register_sysctl_table(brnf_net_table); |
1da177e4 | 966 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
967 | printk(KERN_WARNING |
968 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 PM |
969 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
970 | return -ENOMEM; | |
1da177e4 LT |
971 | } |
972 | #endif | |
1da177e4 | 973 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
974 | return 0; |
975 | } | |
976 | ||
977 | void br_netfilter_fini(void) | |
978 | { | |
5eb87f45 | 979 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
980 | #ifdef CONFIG_SYSCTL |
981 | unregister_sysctl_table(brnf_sysctl_header); | |
982 | #endif | |
983 | } |