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