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