Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * Bart De Schuymer (maintainer) <bdschuym@pandora.be> | |
8 | * | |
9 | * Changes: | |
10 | * Apr 29 2003: physdev module support (bdschuym) | |
11 | * Jun 19 2003: let arptables see bridged ARP traffic (bdschuym) | |
12 | * Oct 06 2003: filter encapsulated IP/ARP VLAN traffic on untagged bridge | |
13 | * (bdschuym) | |
14 | * Sep 01 2004: add IPv6 filtering (bdschuym) | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | * | |
21 | * Lennert dedicates this file to Kerstin Wurdinger. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/ip.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/skbuff.h> | |
14c85021 | 29 | #include <linux/if_arp.h> |
1da177e4 LT |
30 | #include <linux/if_ether.h> |
31 | #include <linux/if_vlan.h> | |
516299d2 MM |
32 | #include <linux/if_pppox.h> |
33 | #include <linux/ppp_defs.h> | |
1da177e4 LT |
34 | #include <linux/netfilter_bridge.h> |
35 | #include <linux/netfilter_ipv4.h> | |
36 | #include <linux/netfilter_ipv6.h> | |
37 | #include <linux/netfilter_arp.h> | |
38 | #include <linux/in_route.h> | |
f216f082 | 39 | #include <linux/inetdevice.h> |
14c85021 | 40 | |
1da177e4 LT |
41 | #include <net/ip.h> |
42 | #include <net/ipv6.h> | |
14c85021 ACM |
43 | #include <net/route.h> |
44 | ||
1da177e4 | 45 | #include <asm/uaccess.h> |
1da177e4 LT |
46 | #include "br_private.h" |
47 | #ifdef CONFIG_SYSCTL | |
48 | #include <linux/sysctl.h> | |
49 | #endif | |
50 | ||
51 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
52 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
53 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
54 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 55 | |
1da177e4 LT |
56 | #ifdef CONFIG_SYSCTL |
57 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
58 | static int brnf_call_iptables __read_mostly = 1; |
59 | static int brnf_call_ip6tables __read_mostly = 1; | |
60 | static int brnf_call_arptables __read_mostly = 1; | |
61 | static int brnf_filter_vlan_tagged __read_mostly = 1; | |
516299d2 | 62 | static int brnf_filter_pppoe_tagged __read_mostly = 1; |
1da177e4 LT |
63 | #else |
64 | #define brnf_filter_vlan_tagged 1 | |
516299d2 | 65 | #define brnf_filter_pppoe_tagged 1 |
1da177e4 LT |
66 | #endif |
67 | ||
b6f99a21 | 68 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 SH |
69 | { |
70 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
71 | } | |
72 | ||
73 | #define IS_VLAN_IP(skb) \ | |
74 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
9d6f229f | 75 | vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
76 | brnf_filter_vlan_tagged) |
77 | ||
78 | #define IS_VLAN_IPV6(skb) \ | |
79 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
80 | vlan_proto(skb) == htons(ETH_P_IPV6) &&\ | |
81 | brnf_filter_vlan_tagged) | |
82 | ||
83 | #define IS_VLAN_ARP(skb) \ | |
84 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
85 | vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
86 | brnf_filter_vlan_tagged) | |
1da177e4 | 87 | |
516299d2 MM |
88 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
89 | { | |
90 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
91 | sizeof(struct pppoe_hdr))); | |
92 | } | |
93 | ||
94 | #define IS_PPPOE_IP(skb) \ | |
95 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
96 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
97 | brnf_filter_pppoe_tagged) | |
98 | ||
99 | #define IS_PPPOE_IPV6(skb) \ | |
100 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
101 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
102 | brnf_filter_pppoe_tagged) | |
103 | ||
4adf0af6 SW |
104 | /* |
105 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
106 | * Currently, we fill in the PMTU entry because netfilter |
107 | * refragmentation needs it, and the rt_flags entry because | |
108 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
109 | * require us to fill additional fields. |
110 | */ | |
111 | void br_netfilter_rtable_init(struct net_bridge *br) | |
112 | { | |
113 | struct rtable *rt = &br->fake_rtable; | |
114 | ||
115 | atomic_set(&rt->u.dst.__refcnt, 1); | |
ad619800 | 116 | rt->u.dst.dev = br->dev; |
4adf0af6 SW |
117 | rt->u.dst.path = &rt->u.dst; |
118 | rt->u.dst.metrics[RTAX_MTU - 1] = 1500; | |
119 | rt->u.dst.flags = DST_NOXFRM; | |
120 | } | |
121 | ||
122 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
123 | { | |
124 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
125 | ||
126 | return port ? &port->br->fake_rtable : NULL; | |
127 | } | |
1da177e4 | 128 | |
5dce971a SH |
129 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
130 | { | |
131 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
132 | ||
133 | return port ? port->br->dev : NULL; | |
134 | } | |
1da177e4 | 135 | |
fdeabdef SH |
136 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
137 | { | |
138 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
139 | if (likely(skb->nf_bridge)) | |
140 | atomic_set(&(skb->nf_bridge->use), 1); | |
141 | ||
142 | return skb->nf_bridge; | |
143 | } | |
144 | ||
2dc2f207 PM |
145 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
146 | { | |
147 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
148 | ||
149 | if (atomic_read(&nf_bridge->use) > 1) { | |
150 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
151 | ||
152 | if (tmp) { | |
153 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
154 | atomic_set(&tmp->use, 1); | |
155 | nf_bridge_put(nf_bridge); | |
156 | } | |
157 | nf_bridge = tmp; | |
158 | } | |
159 | return nf_bridge; | |
160 | } | |
161 | ||
fc38582d PM |
162 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
163 | { | |
164 | unsigned int len = nf_bridge_encap_header_len(skb); | |
165 | ||
166 | skb_push(skb, len); | |
167 | skb->network_header -= len; | |
168 | } | |
169 | ||
170 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 171 | { |
fc38582d PM |
172 | unsigned int len = nf_bridge_encap_header_len(skb); |
173 | ||
174 | skb_pull(skb, len); | |
175 | skb->network_header += len; | |
176 | } | |
fdeabdef | 177 | |
fc38582d PM |
178 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
179 | { | |
180 | unsigned int len = nf_bridge_encap_header_len(skb); | |
181 | ||
182 | skb_pull_rcsum(skb, len); | |
183 | skb->network_header += len; | |
184 | } | |
185 | ||
186 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
187 | { | |
188 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 189 | |
d626f62b ACM |
190 | skb_copy_from_linear_data_offset(skb, -header_size, |
191 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
192 | } |
193 | ||
07317621 SH |
194 | /* |
195 | * When forwarding bridge frames, we save a copy of the original | |
196 | * header before processing. | |
197 | */ | |
198 | int nf_bridge_copy_header(struct sk_buff *skb) | |
199 | { | |
200 | int err; | |
fc38582d | 201 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
07317621 | 202 | |
d9cc2048 | 203 | err = skb_cow_head(skb, header_size); |
07317621 SH |
204 | if (err) |
205 | return err; | |
206 | ||
27d7ff46 ACM |
207 | skb_copy_to_linear_data_offset(skb, -header_size, |
208 | skb->nf_bridge->data, header_size); | |
fc38582d | 209 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
210 | return 0; |
211 | } | |
212 | ||
1da177e4 LT |
213 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
214 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
215 | * bridge PRE_ROUTING hook. */ | |
216 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
217 | { | |
218 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
219 | ||
1da177e4 LT |
220 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
221 | skb->pkt_type = PACKET_OTHERHOST; | |
222 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
223 | } | |
224 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
225 | ||
4adf0af6 SW |
226 | skb->rtable = bridge_parent_rtable(nf_bridge->physindev); |
227 | if (!skb->rtable) { | |
228 | kfree_skb(skb); | |
229 | return 0; | |
230 | } | |
231 | dst_hold(&skb->rtable->u.dst); | |
1da177e4 LT |
232 | |
233 | skb->dev = nf_bridge->physindev; | |
fc38582d | 234 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
235 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
236 | br_handle_frame_finish, 1); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static void __br_dnat_complain(void) | |
242 | { | |
243 | static unsigned long last_complaint; | |
244 | ||
245 | if (jiffies - last_complaint >= 5 * HZ) { | |
246 | printk(KERN_WARNING "Performing cross-bridge DNAT requires IP " | |
789bc3e5 | 247 | "forwarding to be enabled\n"); |
1da177e4 LT |
248 | last_complaint = jiffies; |
249 | } | |
250 | } | |
251 | ||
252 | /* This requires some explaining. If DNAT has taken place, | |
253 | * we will need to fix up the destination Ethernet address, | |
254 | * and this is a tricky process. | |
255 | * | |
256 | * There are two cases to consider: | |
257 | * 1. The packet was DNAT'ed to a device in the same bridge | |
258 | * port group as it was received on. We can still bridge | |
259 | * the packet. | |
260 | * 2. The packet was DNAT'ed to a different device, either | |
261 | * a non-bridged device or another bridge port group. | |
262 | * The packet will need to be routed. | |
263 | * | |
264 | * The correct way of distinguishing between these two cases is to | |
265 | * call ip_route_input() and to look at skb->dst->dev, which is | |
266 | * changed to the destination device if ip_route_input() succeeds. | |
267 | * | |
268 | * Let us first consider the case that ip_route_input() succeeds: | |
269 | * | |
270 | * If skb->dst->dev equals the logical bridge device the packet | |
2948d2eb PM |
271 | * came in on, we can consider this bridging. The packet is passed |
272 | * through the neighbour output function to build a new destination | |
273 | * MAC address, which will make the packet enter br_nf_local_out() | |
1da177e4 LT |
274 | * not much later. In that function it is assured that the iptables |
275 | * FORWARD chain is traversed for the packet. | |
276 | * | |
277 | * Otherwise, the packet is considered to be routed and we just | |
278 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
279 | * later be passed up to the IP stack to be routed. For a redirected |
280 | * packet, ip_route_input() will give back the localhost as output device, | |
281 | * which differs from the bridge device. | |
1da177e4 LT |
282 | * |
283 | * Let us now consider the case that ip_route_input() fails: | |
284 | * | |
f216f082 BDS |
285 | * This can be because the destination address is martian, in which case |
286 | * the packet will be dropped. | |
1da177e4 LT |
287 | * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input() |
288 | * will fail, while __ip_route_output_key() will return success. The source | |
289 | * address for __ip_route_output_key() is set to zero, so __ip_route_output_key | |
290 | * thinks we're handling a locally generated packet and won't care | |
291 | * if IP forwarding is allowed. We send a warning message to the users's | |
292 | * log telling her to put IP forwarding on. | |
293 | * | |
294 | * ip_route_input() will also fail if there is no route available. | |
295 | * In that case we just drop the packet. | |
296 | * | |
297 | * --Lennert, 20020411 | |
298 | * --Bart, 20020416 (updated) | |
f216f082 BDS |
299 | * --Bart, 20021007 (updated) |
300 | * --Bart, 20062711 (updated) */ | |
1da177e4 LT |
301 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
302 | { | |
1da177e4 LT |
303 | if (skb->pkt_type == PACKET_OTHERHOST) { |
304 | skb->pkt_type = PACKET_HOST; | |
305 | skb->nf_bridge->mask |= BRNF_PKT_TYPE; | |
306 | } | |
307 | skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
308 | ||
309 | skb->dev = bridge_parent(skb->dev); | |
2948d2eb PM |
310 | if (skb->dev) { |
311 | struct dst_entry *dst = skb->dst; | |
312 | ||
fc38582d | 313 | nf_bridge_pull_encap_header(skb); |
2948d2eb PM |
314 | |
315 | if (dst->hh) | |
316 | return neigh_hh_output(dst->hh, skb); | |
317 | else if (dst->neighbour) | |
318 | return dst->neighbour->output(skb); | |
1da177e4 | 319 | } |
2948d2eb | 320 | kfree_skb(skb); |
1da177e4 LT |
321 | return 0; |
322 | } | |
323 | ||
324 | static int br_nf_pre_routing_finish(struct sk_buff *skb) | |
325 | { | |
326 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 327 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 328 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
f216f082 | 329 | int err; |
1da177e4 | 330 | |
1da177e4 LT |
331 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
332 | skb->pkt_type = PACKET_OTHERHOST; | |
333 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
334 | } | |
335 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 336 | if (dnat_took_place(skb)) { |
f216f082 | 337 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
1da177e4 | 338 | struct rtable *rt; |
789bc3e5 SH |
339 | struct flowi fl = { |
340 | .nl_u = { | |
341 | .ip4_u = { | |
342 | .daddr = iph->daddr, | |
343 | .saddr = 0, | |
344 | .tos = RT_TOS(iph->tos) }, | |
345 | }, | |
346 | .proto = 0, | |
347 | }; | |
f216f082 BDS |
348 | struct in_device *in_dev = in_dev_get(dev); |
349 | ||
350 | /* If err equals -EHOSTUNREACH the error is due to a | |
351 | * martian destination or due to the fact that | |
352 | * forwarding is disabled. For most martian packets, | |
353 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
354 | * martian destinations: loopback destinations and destination | |
355 | * 0.0.0.0. In both cases the packet will be dropped because the | |
356 | * destination is the loopback device and not the bridge. */ | |
357 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
358 | goto free_skb; | |
1da177e4 | 359 | |
f206351a | 360 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
1c011bed | 361 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
362 | * require ip_forwarding. */ |
363 | if (((struct dst_entry *)rt)->dev == dev) { | |
1da177e4 LT |
364 | skb->dst = (struct dst_entry *)rt; |
365 | goto bridged_dnat; | |
366 | } | |
f216f082 BDS |
367 | /* we are sure that forwarding is disabled, so printing |
368 | * this message is no problem. Note that the packet could | |
369 | * still have a martian destination address, in which case | |
370 | * the packet could be dropped even if forwarding were enabled */ | |
1da177e4 LT |
371 | __br_dnat_complain(); |
372 | dst_release((struct dst_entry *)rt); | |
373 | } | |
f216f082 | 374 | free_skb: |
1da177e4 LT |
375 | kfree_skb(skb); |
376 | return 0; | |
377 | } else { | |
378 | if (skb->dst->dev == dev) { | |
379 | bridged_dnat: | |
380 | /* Tell br_nf_local_out this is a | |
381 | * bridged frame */ | |
382 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
383 | skb->dev = nf_bridge->physindev; | |
fc38582d | 384 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
385 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, |
386 | skb, skb->dev, NULL, | |
387 | br_nf_pre_routing_finish_bridge, | |
388 | 1); | |
389 | return 0; | |
390 | } | |
789bc3e5 | 391 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
392 | skb->pkt_type = PACKET_HOST; |
393 | } | |
394 | } else { | |
4adf0af6 SW |
395 | skb->rtable = bridge_parent_rtable(nf_bridge->physindev); |
396 | if (!skb->rtable) { | |
397 | kfree_skb(skb); | |
398 | return 0; | |
399 | } | |
400 | dst_hold(&skb->rtable->u.dst); | |
1da177e4 LT |
401 | } |
402 | ||
403 | skb->dev = nf_bridge->physindev; | |
fc38582d | 404 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
405 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
406 | br_handle_frame_finish, 1); | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 412 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
413 | { |
414 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
415 | ||
416 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
417 | skb->pkt_type = PACKET_HOST; | |
418 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
419 | } | |
420 | ||
421 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
422 | nf_bridge->physindev = skb->dev; | |
423 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
424 | |
425 | return skb->dev; | |
1da177e4 LT |
426 | } |
427 | ||
428 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
429 | static int check_hbh_len(struct sk_buff *skb) | |
430 | { | |
0660e03f | 431 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 432 | u32 pkt_len; |
d56f90a7 ACM |
433 | const unsigned char *nh = skb_network_header(skb); |
434 | int off = raw - nh; | |
789bc3e5 | 435 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
436 | |
437 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
438 | goto bad; | |
439 | ||
440 | off += 2; | |
441 | len -= 2; | |
442 | ||
443 | while (len > 0) { | |
d56f90a7 | 444 | int optlen = nh[off + 1] + 2; |
1da177e4 | 445 | |
d56f90a7 | 446 | switch (nh[off]) { |
1da177e4 LT |
447 | case IPV6_TLV_PAD0: |
448 | optlen = 1; | |
449 | break; | |
450 | ||
451 | case IPV6_TLV_PADN: | |
452 | break; | |
453 | ||
454 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 455 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 456 | goto bad; |
d56f90a7 | 457 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 458 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 459 | ipv6_hdr(skb)->payload_len) |
b0366486 | 460 | goto bad; |
1da177e4 LT |
461 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
462 | goto bad; | |
b0366486 | 463 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 464 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 465 | goto bad; |
d56f90a7 | 466 | nh = skb_network_header(skb); |
1da177e4 LT |
467 | break; |
468 | default: | |
469 | if (optlen > len) | |
470 | goto bad; | |
471 | break; | |
472 | } | |
473 | off += optlen; | |
474 | len -= optlen; | |
475 | } | |
476 | if (len == 0) | |
477 | return 0; | |
478 | bad: | |
479 | return -1; | |
480 | ||
481 | } | |
482 | ||
483 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
484 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
485 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
486 | struct sk_buff *skb, |
487 | const struct net_device *in, | |
488 | const struct net_device *out, | |
489 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
490 | { |
491 | struct ipv6hdr *hdr; | |
492 | u32 pkt_len; | |
1da177e4 LT |
493 | |
494 | if (skb->len < sizeof(struct ipv6hdr)) | |
495 | goto inhdr_error; | |
496 | ||
497 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
498 | goto inhdr_error; | |
499 | ||
0660e03f | 500 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
501 | |
502 | if (hdr->version != 6) | |
503 | goto inhdr_error; | |
504 | ||
505 | pkt_len = ntohs(hdr->payload_len); | |
506 | ||
507 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
508 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
509 | goto inhdr_error; | |
b38dfee3 HX |
510 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
511 | goto inhdr_error; | |
1da177e4 LT |
512 | } |
513 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 514 | goto inhdr_error; |
1da177e4 | 515 | |
789bc3e5 | 516 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 517 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 518 | return NF_DROP; |
5dce971a SH |
519 | if (!setup_pre_routing(skb)) |
520 | return NF_DROP; | |
1da177e4 | 521 | |
6e23ae2a | 522 | NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
523 | br_nf_pre_routing_finish_ipv6); |
524 | ||
525 | return NF_STOLEN; | |
526 | ||
527 | inhdr_error: | |
528 | return NF_DROP; | |
529 | } | |
530 | ||
531 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
532 | * Replicate the checks that IPv4 does on packet reception. | |
533 | * Set skb->dev to the bridge device (i.e. parent of the | |
534 | * receiving device) to make netfilter happy, the REDIRECT | |
535 | * target in particular. Save the original destination IP | |
536 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 537 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
538 | const struct net_device *in, |
539 | const struct net_device *out, | |
540 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
541 | { |
542 | struct iphdr *iph; | |
e7c243c9 EP |
543 | __u32 len = nf_bridge_encap_header_len(skb); |
544 | ||
e7c243c9 EP |
545 | if (unlikely(!pskb_may_pull(skb, len))) |
546 | goto out; | |
1da177e4 | 547 | |
516299d2 MM |
548 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
549 | IS_PPPOE_IPV6(skb)) { | |
1da177e4 LT |
550 | #ifdef CONFIG_SYSCTL |
551 | if (!brnf_call_ip6tables) | |
552 | return NF_ACCEPT; | |
553 | #endif | |
fc38582d | 554 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
555 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
556 | } | |
557 | #ifdef CONFIG_SYSCTL | |
558 | if (!brnf_call_iptables) | |
559 | return NF_ACCEPT; | |
560 | #endif | |
561 | ||
516299d2 MM |
562 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
563 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
564 | return NF_ACCEPT; |
565 | ||
fc38582d | 566 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
567 | |
568 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
569 | goto inhdr_error; | |
570 | ||
eddc9ec5 | 571 | iph = ip_hdr(skb); |
1da177e4 LT |
572 | if (iph->ihl < 5 || iph->version != 4) |
573 | goto inhdr_error; | |
574 | ||
789bc3e5 | 575 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
576 | goto inhdr_error; |
577 | ||
eddc9ec5 | 578 | iph = ip_hdr(skb); |
789bc3e5 | 579 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
580 | goto inhdr_error; |
581 | ||
582 | len = ntohs(iph->tot_len); | |
789bc3e5 | 583 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
584 | goto inhdr_error; |
585 | ||
b38dfee3 | 586 | pskb_trim_rcsum(skb, len); |
1da177e4 | 587 | |
789bc3e5 | 588 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 589 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 590 | return NF_DROP; |
5dce971a SH |
591 | if (!setup_pre_routing(skb)) |
592 | return NF_DROP; | |
1da177e4 LT |
593 | store_orig_dstaddr(skb); |
594 | ||
6e23ae2a | 595 | NF_HOOK(PF_INET, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
596 | br_nf_pre_routing_finish); |
597 | ||
598 | return NF_STOLEN; | |
599 | ||
600 | inhdr_error: | |
789bc3e5 | 601 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
602 | out: |
603 | return NF_DROP; | |
604 | } | |
605 | ||
606 | ||
607 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
608 | /* The packet is locally destined, which requires a real | |
609 | * dst_entry, so detach the fake one. On the way up, the | |
610 | * packet would pass through PRE_ROUTING again (which already | |
611 | * took place when the packet entered the bridge), but we | |
612 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
613 | * prevent this from happening. */ | |
3db05fea | 614 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
615 | const struct net_device *in, |
616 | const struct net_device *out, | |
617 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 618 | { |
4adf0af6 SW |
619 | if (skb->rtable && skb->rtable == bridge_parent_rtable(in)) { |
620 | dst_release(&skb->rtable->u.dst); | |
ee6b9673 | 621 | skb->rtable = NULL; |
1da177e4 LT |
622 | } |
623 | ||
624 | return NF_ACCEPT; | |
625 | } | |
626 | ||
1da177e4 LT |
627 | /* PF_BRIDGE/FORWARD *************************************************/ |
628 | static int br_nf_forward_finish(struct sk_buff *skb) | |
629 | { | |
630 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
631 | struct net_device *in; | |
1da177e4 | 632 | |
8b42ec39 | 633 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
634 | in = nf_bridge->physindev; |
635 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
636 | skb->pkt_type = PACKET_OTHERHOST; | |
637 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
638 | } | |
639 | } else { | |
640 | in = *((struct net_device **)(skb->cb)); | |
641 | } | |
fc38582d | 642 | nf_bridge_push_encap_header(skb); |
1da177e4 | 643 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 644 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
645 | return 0; |
646 | } | |
647 | ||
648 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
649 | * netfilter with indev and outdev set to the bridge device, | |
650 | * but we are still able to filter on the 'real' indev/outdev | |
651 | * because of the physdev module. For ARP, indev and outdev are the | |
652 | * bridge ports. */ | |
3db05fea | 653 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
654 | const struct net_device *in, |
655 | const struct net_device *out, | |
656 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 657 | { |
1da177e4 | 658 | struct nf_bridge_info *nf_bridge; |
5dce971a | 659 | struct net_device *parent; |
76108cea | 660 | u_int8_t pf; |
1da177e4 LT |
661 | |
662 | if (!skb->nf_bridge) | |
663 | return NF_ACCEPT; | |
664 | ||
2dc2f207 PM |
665 | /* Need exclusive nf_bridge_info since we might have multiple |
666 | * different physoutdevs. */ | |
667 | if (!nf_bridge_unshare(skb)) | |
668 | return NF_DROP; | |
669 | ||
5dce971a SH |
670 | parent = bridge_parent(out); |
671 | if (!parent) | |
672 | return NF_DROP; | |
673 | ||
516299d2 MM |
674 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
675 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
676 | pf = PF_INET; |
677 | else | |
678 | pf = PF_INET6; | |
679 | ||
3db05fea | 680 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 681 | |
1da177e4 LT |
682 | nf_bridge = skb->nf_bridge; |
683 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
684 | skb->pkt_type = PACKET_HOST; | |
685 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
686 | } | |
687 | ||
688 | /* The physdev module checks on this */ | |
689 | nf_bridge->mask |= BRNF_BRIDGED; | |
690 | nf_bridge->physoutdev = skb->dev; | |
691 | ||
6e23ae2a | 692 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 693 | br_nf_forward_finish); |
1da177e4 LT |
694 | |
695 | return NF_STOLEN; | |
696 | } | |
697 | ||
3db05fea | 698 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
699 | const struct net_device *in, |
700 | const struct net_device *out, | |
701 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 702 | { |
1da177e4 LT |
703 | struct net_device **d = (struct net_device **)(skb->cb); |
704 | ||
705 | #ifdef CONFIG_SYSCTL | |
706 | if (!brnf_call_arptables) | |
707 | return NF_ACCEPT; | |
708 | #endif | |
709 | ||
f8a26028 | 710 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 711 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 712 | return NF_ACCEPT; |
3db05fea | 713 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
714 | } |
715 | ||
d0a92be0 | 716 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 717 | if (IS_VLAN_ARP(skb)) |
3db05fea | 718 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
719 | return NF_ACCEPT; |
720 | } | |
721 | *d = (struct net_device *)in; | |
722 | NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, | |
723 | (struct net_device *)out, br_nf_forward_finish); | |
724 | ||
725 | return NF_STOLEN; | |
726 | } | |
727 | ||
2bf540b7 PM |
728 | /* PF_BRIDGE/LOCAL_OUT *********************************************** |
729 | * | |
730 | * This function sees both locally originated IP packets and forwarded | |
1da177e4 LT |
731 | * IP packets (in both cases the destination device is a bridge |
732 | * device). It also sees bridged-and-DNAT'ed packets. | |
1da177e4 LT |
733 | * |
734 | * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged | |
735 | * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() | |
736 | * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority | |
737 | * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor | |
738 | * will be executed. | |
2bf540b7 | 739 | */ |
3db05fea | 740 | static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
741 | const struct net_device *in, |
742 | const struct net_device *out, | |
743 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 744 | { |
2bf540b7 | 745 | struct net_device *realindev; |
1da177e4 | 746 | struct nf_bridge_info *nf_bridge; |
1da177e4 LT |
747 | |
748 | if (!skb->nf_bridge) | |
749 | return NF_ACCEPT; | |
750 | ||
2dc2f207 PM |
751 | /* Need exclusive nf_bridge_info since we might have multiple |
752 | * different physoutdevs. */ | |
753 | if (!nf_bridge_unshare(skb)) | |
754 | return NF_DROP; | |
755 | ||
1da177e4 | 756 | nf_bridge = skb->nf_bridge; |
2bf540b7 PM |
757 | if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT)) |
758 | return NF_ACCEPT; | |
1da177e4 LT |
759 | |
760 | /* Bridged, take PF_BRIDGE/FORWARD. | |
761 | * (see big note in front of br_nf_pre_routing_finish) */ | |
2bf540b7 PM |
762 | nf_bridge->physoutdev = skb->dev; |
763 | realindev = nf_bridge->physindev; | |
1da177e4 | 764 | |
2bf540b7 PM |
765 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
766 | skb->pkt_type = PACKET_OTHERHOST; | |
767 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
1da177e4 | 768 | } |
fc38582d | 769 | nf_bridge_push_encap_header(skb); |
1da177e4 | 770 | |
2bf540b7 PM |
771 | NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev, |
772 | br_forward_finish); | |
1da177e4 LT |
773 | return NF_STOLEN; |
774 | } | |
775 | ||
2e2f7aef PM |
776 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
777 | { | |
778 | if (skb->protocol == htons(ETH_P_IP) && | |
779 | skb->len > skb->dev->mtu && | |
89114afd | 780 | !skb_is_gso(skb)) |
2e2f7aef PM |
781 | return ip_fragment(skb, br_dev_queue_push_xmit); |
782 | else | |
783 | return br_dev_queue_push_xmit(skb); | |
784 | } | |
1da177e4 LT |
785 | |
786 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 787 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
788 | const struct net_device *in, |
789 | const struct net_device *out, | |
790 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 791 | { |
3db05fea | 792 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 793 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 794 | u_int8_t pf; |
1da177e4 LT |
795 | |
796 | #ifdef CONFIG_NETFILTER_DEBUG | |
797 | /* Be very paranoid. This probably won't happen anymore, but let's | |
798 | * keep the check just to be sure... */ | |
98e399f8 ACM |
799 | if (skb_mac_header(skb) < skb->head || |
800 | skb_mac_header(skb) + ETH_HLEN > skb->data) { | |
1da177e4 | 801 | printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " |
8394e9b2 | 802 | "bad mac.raw pointer.\n"); |
1da177e4 LT |
803 | goto print_error; |
804 | } | |
805 | #endif | |
806 | ||
807 | if (!nf_bridge) | |
808 | return NF_ACCEPT; | |
809 | ||
81d9ddae PM |
810 | if (!(nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))) |
811 | return NF_ACCEPT; | |
812 | ||
5dce971a SH |
813 | if (!realoutdev) |
814 | return NF_DROP; | |
815 | ||
516299d2 MM |
816 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
817 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
818 | pf = PF_INET; |
819 | else | |
820 | pf = PF_INET6; | |
821 | ||
822 | #ifdef CONFIG_NETFILTER_DEBUG | |
823 | if (skb->dst == NULL) { | |
8394e9b2 | 824 | printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL\n"); |
1da177e4 LT |
825 | goto print_error; |
826 | } | |
1da177e4 LT |
827 | #endif |
828 | ||
829 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
830 | * about the value of skb->pkt_type. */ | |
831 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
832 | skb->pkt_type = PACKET_HOST; | |
833 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
834 | } | |
835 | ||
fc38582d | 836 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
837 | nf_bridge_save_header(skb); |
838 | ||
6e23ae2a | 839 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 840 | br_nf_dev_queue_xmit); |
1da177e4 LT |
841 | |
842 | return NF_STOLEN; | |
843 | ||
844 | #ifdef CONFIG_NETFILTER_DEBUG | |
845 | print_error: | |
846 | if (skb->dev != NULL) { | |
847 | printk("[%s]", skb->dev->name); | |
178a3259 SH |
848 | if (realoutdev) |
849 | printk("[%s]", realoutdev->name); | |
1da177e4 | 850 | } |
98e399f8 | 851 | printk(" head:%p, raw:%p, data:%p\n", skb->head, skb_mac_header(skb), |
789bc3e5 | 852 | skb->data); |
8394e9b2 | 853 | dump_stack(); |
1da177e4 LT |
854 | return NF_ACCEPT; |
855 | #endif | |
856 | } | |
857 | ||
1da177e4 LT |
858 | /* IP/SABOTAGE *****************************************************/ |
859 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
860 | * for the second time. */ | |
3db05fea | 861 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
862 | const struct net_device *in, |
863 | const struct net_device *out, | |
864 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 865 | { |
3db05fea HX |
866 | if (skb->nf_bridge && |
867 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
868 | return NF_STOP; |
869 | } | |
870 | ||
871 | return NF_ACCEPT; | |
872 | } | |
873 | ||
1da177e4 LT |
874 | /* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent |
875 | * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. | |
876 | * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
877 | * ip_refrag() can return NF_STOLEN. */ | |
1999414a | 878 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
9d6f229f YH |
879 | { .hook = br_nf_pre_routing, |
880 | .owner = THIS_MODULE, | |
881 | .pf = PF_BRIDGE, | |
882 | .hooknum = NF_BR_PRE_ROUTING, | |
1da177e4 LT |
883 | .priority = NF_BR_PRI_BRNF, }, |
884 | { .hook = br_nf_local_in, | |
885 | .owner = THIS_MODULE, | |
886 | .pf = PF_BRIDGE, | |
887 | .hooknum = NF_BR_LOCAL_IN, | |
888 | .priority = NF_BR_PRI_BRNF, }, | |
889 | { .hook = br_nf_forward_ip, | |
890 | .owner = THIS_MODULE, | |
891 | .pf = PF_BRIDGE, | |
892 | .hooknum = NF_BR_FORWARD, | |
893 | .priority = NF_BR_PRI_BRNF - 1, }, | |
894 | { .hook = br_nf_forward_arp, | |
895 | .owner = THIS_MODULE, | |
896 | .pf = PF_BRIDGE, | |
897 | .hooknum = NF_BR_FORWARD, | |
898 | .priority = NF_BR_PRI_BRNF, }, | |
899 | { .hook = br_nf_local_out, | |
900 | .owner = THIS_MODULE, | |
901 | .pf = PF_BRIDGE, | |
902 | .hooknum = NF_BR_LOCAL_OUT, | |
903 | .priority = NF_BR_PRI_FIRST, }, | |
904 | { .hook = br_nf_post_routing, | |
905 | .owner = THIS_MODULE, | |
906 | .pf = PF_BRIDGE, | |
907 | .hooknum = NF_BR_POST_ROUTING, | |
908 | .priority = NF_BR_PRI_LAST, }, | |
909 | { .hook = ip_sabotage_in, | |
910 | .owner = THIS_MODULE, | |
911 | .pf = PF_INET, | |
6e23ae2a | 912 | .hooknum = NF_INET_PRE_ROUTING, |
1da177e4 LT |
913 | .priority = NF_IP_PRI_FIRST, }, |
914 | { .hook = ip_sabotage_in, | |
915 | .owner = THIS_MODULE, | |
916 | .pf = PF_INET6, | |
6e23ae2a | 917 | .hooknum = NF_INET_PRE_ROUTING, |
1da177e4 | 918 | .priority = NF_IP6_PRI_FIRST, }, |
1da177e4 LT |
919 | }; |
920 | ||
921 | #ifdef CONFIG_SYSCTL | |
922 | static | |
789bc3e5 SH |
923 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp, |
924 | void __user * buffer, size_t * lenp, loff_t * ppos) | |
1da177e4 LT |
925 | { |
926 | int ret; | |
927 | ||
928 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
929 | ||
930 | if (write && *(int *)(ctl->data)) | |
931 | *(int *)(ctl->data) = 1; | |
932 | return ret; | |
933 | } | |
934 | ||
935 | static ctl_table brnf_table[] = { | |
936 | { | |
1da177e4 LT |
937 | .procname = "bridge-nf-call-arptables", |
938 | .data = &brnf_call_arptables, | |
939 | .maxlen = sizeof(int), | |
940 | .mode = 0644, | |
941 | .proc_handler = &brnf_sysctl_call_tables, | |
942 | }, | |
943 | { | |
1da177e4 LT |
944 | .procname = "bridge-nf-call-iptables", |
945 | .data = &brnf_call_iptables, | |
946 | .maxlen = sizeof(int), | |
947 | .mode = 0644, | |
948 | .proc_handler = &brnf_sysctl_call_tables, | |
949 | }, | |
950 | { | |
1da177e4 LT |
951 | .procname = "bridge-nf-call-ip6tables", |
952 | .data = &brnf_call_ip6tables, | |
953 | .maxlen = sizeof(int), | |
954 | .mode = 0644, | |
955 | .proc_handler = &brnf_sysctl_call_tables, | |
956 | }, | |
957 | { | |
1da177e4 LT |
958 | .procname = "bridge-nf-filter-vlan-tagged", |
959 | .data = &brnf_filter_vlan_tagged, | |
960 | .maxlen = sizeof(int), | |
961 | .mode = 0644, | |
962 | .proc_handler = &brnf_sysctl_call_tables, | |
516299d2 MM |
963 | }, |
964 | { | |
516299d2 MM |
965 | .procname = "bridge-nf-filter-pppoe-tagged", |
966 | .data = &brnf_filter_pppoe_tagged, | |
967 | .maxlen = sizeof(int), | |
968 | .mode = 0644, | |
969 | .proc_handler = &brnf_sysctl_call_tables, | |
1da177e4 LT |
970 | }, |
971 | { .ctl_name = 0 } | |
972 | }; | |
973 | ||
b5ccd792 PE |
974 | static struct ctl_path brnf_path[] = { |
975 | { .procname = "net", .ctl_name = CTL_NET, }, | |
976 | { .procname = "bridge", .ctl_name = NET_BRIDGE, }, | |
977 | { } | |
1da177e4 LT |
978 | }; |
979 | #endif | |
980 | ||
5eb87f45 | 981 | int __init br_netfilter_init(void) |
1da177e4 | 982 | { |
5eb87f45 | 983 | int ret; |
1da177e4 | 984 | |
5eb87f45 PM |
985 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
986 | if (ret < 0) | |
1da177e4 | 987 | return ret; |
1da177e4 | 988 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 989 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 990 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
991 | printk(KERN_WARNING |
992 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 PM |
993 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
994 | return -ENOMEM; | |
1da177e4 LT |
995 | } |
996 | #endif | |
1da177e4 | 997 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
998 | return 0; |
999 | } | |
1000 | ||
1001 | void br_netfilter_fini(void) | |
1002 | { | |
5eb87f45 | 1003 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
1004 | #ifdef CONFIG_SYSCTL |
1005 | unregister_sysctl_table(brnf_sysctl_header); | |
1006 | #endif | |
1007 | } |