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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
8237908e BDS |
6 | * Lennert Buytenhek <buytenh@gnu.org> |
7 | * Bart De Schuymer <bdschuym@pandora.be> | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Lennert dedicates this file to Kerstin Wurdinger. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/ip.h> |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/skbuff.h> | |
14c85021 | 23 | #include <linux/if_arp.h> |
1da177e4 LT |
24 | #include <linux/if_ether.h> |
25 | #include <linux/if_vlan.h> | |
516299d2 MM |
26 | #include <linux/if_pppox.h> |
27 | #include <linux/ppp_defs.h> | |
1da177e4 LT |
28 | #include <linux/netfilter_bridge.h> |
29 | #include <linux/netfilter_ipv4.h> | |
30 | #include <linux/netfilter_ipv6.h> | |
31 | #include <linux/netfilter_arp.h> | |
32 | #include <linux/in_route.h> | |
f216f082 | 33 | #include <linux/inetdevice.h> |
14c85021 | 34 | |
1da177e4 LT |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
14c85021 ACM |
37 | #include <net/route.h> |
38 | ||
1da177e4 | 39 | #include <asm/uaccess.h> |
1da177e4 LT |
40 | #include "br_private.h" |
41 | #ifdef CONFIG_SYSCTL | |
42 | #include <linux/sysctl.h> | |
43 | #endif | |
44 | ||
45 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
46 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
47 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
48 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 49 | |
1da177e4 LT |
50 | #ifdef CONFIG_SYSCTL |
51 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
52 | static int brnf_call_iptables __read_mostly = 1; |
53 | static int brnf_call_ip6tables __read_mostly = 1; | |
54 | static int brnf_call_arptables __read_mostly = 1; | |
47e0e1ca HX |
55 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
56 | static int brnf_filter_pppoe_tagged __read_mostly = 0; | |
1da177e4 | 57 | #else |
4df53d8b PM |
58 | #define brnf_call_iptables 1 |
59 | #define brnf_call_ip6tables 1 | |
60 | #define brnf_call_arptables 1 | |
47e0e1ca HX |
61 | #define brnf_filter_vlan_tagged 0 |
62 | #define brnf_filter_pppoe_tagged 0 | |
1da177e4 LT |
63 | #endif |
64 | ||
b6f99a21 | 65 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 | 66 | { |
13937911 JG |
67 | if (vlan_tx_tag_present(skb)) |
68 | return skb->protocol; | |
69 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
70 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
71 | else | |
72 | return 0; | |
8b42ec39 SH |
73 | } |
74 | ||
75 | #define IS_VLAN_IP(skb) \ | |
13937911 | 76 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
77 | brnf_filter_vlan_tagged) |
78 | ||
79 | #define IS_VLAN_IPV6(skb) \ | |
13937911 | 80 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
8b42ec39 SH |
81 | brnf_filter_vlan_tagged) |
82 | ||
83 | #define IS_VLAN_ARP(skb) \ | |
13937911 | 84 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
8b42ec39 | 85 | brnf_filter_vlan_tagged) |
1da177e4 | 86 | |
516299d2 MM |
87 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
88 | { | |
89 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
90 | sizeof(struct pppoe_hdr))); | |
91 | } | |
92 | ||
93 | #define IS_PPPOE_IP(skb) \ | |
94 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
95 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
96 | brnf_filter_pppoe_tagged) | |
97 | ||
98 | #define IS_PPPOE_IPV6(skb) \ | |
99 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
100 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
101 | brnf_filter_pppoe_tagged) | |
102 | ||
631339f1 HX |
103 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
104 | { | |
105 | } | |
106 | ||
107 | static struct dst_ops fake_dst_ops = { | |
108 | .family = AF_INET, | |
09640e63 | 109 | .protocol = cpu_to_be16(ETH_P_IP), |
631339f1 | 110 | .update_pmtu = fake_update_pmtu, |
631339f1 HX |
111 | }; |
112 | ||
4adf0af6 SW |
113 | /* |
114 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
115 | * Currently, we fill in the PMTU entry because netfilter |
116 | * refragmentation needs it, and the rt_flags entry because | |
117 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
118 | * require us to fill additional fields. |
119 | */ | |
120 | void br_netfilter_rtable_init(struct net_bridge *br) | |
121 | { | |
122 | struct rtable *rt = &br->fake_rtable; | |
123 | ||
d8d1f30b CG |
124 | atomic_set(&rt->dst.__refcnt, 1); |
125 | rt->dst.dev = br->dev; | |
126 | rt->dst.path = &rt->dst; | |
defb3519 | 127 | dst_metric_set(&rt->dst, RTAX_MTU, 1500); |
d8d1f30b CG |
128 | rt->dst.flags = DST_NOXFRM; |
129 | rt->dst.ops = &fake_dst_ops; | |
4adf0af6 SW |
130 | } |
131 | ||
132 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
133 | { | |
b5ed54e9 | 134 | struct net_bridge_port *port; |
135 | ||
136 | port = br_port_get_rcu(dev); | |
137 | return port ? &port->br->fake_rtable : NULL; | |
4adf0af6 | 138 | } |
1da177e4 | 139 | |
5dce971a SH |
140 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
141 | { | |
b5ed54e9 | 142 | struct net_bridge_port *port; |
5dce971a | 143 | |
b5ed54e9 | 144 | port = br_port_get_rcu(dev); |
145 | return port ? port->br->dev : NULL; | |
5dce971a | 146 | } |
1da177e4 | 147 | |
fdeabdef SH |
148 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
149 | { | |
150 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
151 | if (likely(skb->nf_bridge)) | |
152 | atomic_set(&(skb->nf_bridge->use), 1); | |
153 | ||
154 | return skb->nf_bridge; | |
155 | } | |
156 | ||
2dc2f207 PM |
157 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
158 | { | |
159 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
160 | ||
161 | if (atomic_read(&nf_bridge->use) > 1) { | |
162 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
163 | ||
164 | if (tmp) { | |
165 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
166 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 167 | } |
4c3a76ab | 168 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
169 | nf_bridge = tmp; |
170 | } | |
171 | return nf_bridge; | |
172 | } | |
173 | ||
fc38582d PM |
174 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
175 | { | |
176 | unsigned int len = nf_bridge_encap_header_len(skb); | |
177 | ||
178 | skb_push(skb, len); | |
179 | skb->network_header -= len; | |
180 | } | |
181 | ||
182 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 183 | { |
fc38582d PM |
184 | unsigned int len = nf_bridge_encap_header_len(skb); |
185 | ||
186 | skb_pull(skb, len); | |
187 | skb->network_header += len; | |
188 | } | |
fdeabdef | 189 | |
fc38582d PM |
190 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
191 | { | |
192 | unsigned int len = nf_bridge_encap_header_len(skb); | |
193 | ||
194 | skb_pull_rcsum(skb, len); | |
195 | skb->network_header += len; | |
196 | } | |
197 | ||
198 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
199 | { | |
200 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 201 | |
d626f62b ACM |
202 | skb_copy_from_linear_data_offset(skb, -header_size, |
203 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
204 | } |
205 | ||
e179e632 BDS |
206 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
207 | { | |
208 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
209 | skb->protocol = htons(ETH_P_8021Q); | |
210 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
211 | skb->protocol = htons(ETH_P_PPP_SES); | |
212 | } | |
213 | ||
462fb2af BD |
214 | /* When handing a packet over to the IP layer |
215 | * check whether we have a skb that is in the | |
216 | * expected format | |
217 | */ | |
218 | ||
d0280232 | 219 | static int br_parse_ip_options(struct sk_buff *skb) |
462fb2af BD |
220 | { |
221 | struct ip_options *opt; | |
222 | struct iphdr *iph; | |
223 | struct net_device *dev = skb->dev; | |
224 | u32 len; | |
225 | ||
226 | iph = ip_hdr(skb); | |
227 | opt = &(IPCB(skb)->opt); | |
228 | ||
229 | /* Basic sanity checks */ | |
230 | if (iph->ihl < 5 || iph->version != 4) | |
231 | goto inhdr_error; | |
232 | ||
233 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
234 | goto inhdr_error; | |
235 | ||
236 | iph = ip_hdr(skb); | |
237 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
238 | goto inhdr_error; | |
239 | ||
240 | len = ntohs(iph->tot_len); | |
241 | if (skb->len < len) { | |
242 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
243 | goto drop; | |
244 | } else if (len < (iph->ihl*4)) | |
245 | goto inhdr_error; | |
246 | ||
247 | if (pskb_trim_rcsum(skb, len)) { | |
248 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
249 | goto drop; | |
250 | } | |
251 | ||
252 | /* Zero out the CB buffer if no options present */ | |
253 | if (iph->ihl == 5) { | |
254 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
259 | if (ip_options_compile(dev_net(dev), opt, skb)) | |
260 | goto inhdr_error; | |
261 | ||
262 | /* Check correct handling of SRR option */ | |
263 | if (unlikely(opt->srr)) { | |
264 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
265 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) | |
266 | goto drop; | |
267 | ||
268 | if (ip_options_rcv_srr(skb)) | |
269 | goto drop; | |
270 | } | |
271 | ||
272 | return 0; | |
273 | ||
274 | inhdr_error: | |
275 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
276 | drop: | |
277 | return -1; | |
278 | } | |
279 | ||
e179e632 BDS |
280 | /* Fill in the header for fragmented IP packets handled by |
281 | * the IPv4 connection tracking code. | |
07317621 SH |
282 | */ |
283 | int nf_bridge_copy_header(struct sk_buff *skb) | |
284 | { | |
285 | int err; | |
e179e632 | 286 | unsigned int header_size; |
07317621 | 287 | |
e179e632 BDS |
288 | nf_bridge_update_protocol(skb); |
289 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 290 | err = skb_cow_head(skb, header_size); |
07317621 SH |
291 | if (err) |
292 | return err; | |
293 | ||
27d7ff46 ACM |
294 | skb_copy_to_linear_data_offset(skb, -header_size, |
295 | skb->nf_bridge->data, header_size); | |
fc38582d | 296 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
297 | return 0; |
298 | } | |
299 | ||
1da177e4 LT |
300 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
301 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
302 | * bridge PRE_ROUTING hook. */ | |
303 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
304 | { | |
305 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 306 | struct rtable *rt; |
1da177e4 | 307 | |
1da177e4 LT |
308 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
309 | skb->pkt_type = PACKET_OTHERHOST; | |
310 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
311 | } | |
312 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
313 | ||
511c3f92 ED |
314 | rt = bridge_parent_rtable(nf_bridge->physindev); |
315 | if (!rt) { | |
4adf0af6 SW |
316 | kfree_skb(skb); |
317 | return 0; | |
318 | } | |
f9181f4f | 319 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
320 | |
321 | skb->dev = nf_bridge->physindev; | |
e179e632 | 322 | nf_bridge_update_protocol(skb); |
fc38582d | 323 | nf_bridge_push_encap_header(skb); |
713aefa3 | 324 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
325 | br_handle_frame_finish, 1); |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
e179e632 BDS |
330 | /* Obtain the correct destination MAC address, while preserving the original |
331 | * source MAC address. If we already know this address, we just copy it. If we | |
332 | * don't, we use the neighbour framework to find out. In both cases, we make | |
333 | * sure that br_handle_frame_finish() is called afterwards. | |
334 | */ | |
335 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
336 | { | |
337 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
338 | struct dst_entry *dst; | |
339 | ||
340 | skb->dev = bridge_parent(skb->dev); | |
341 | if (!skb->dev) | |
342 | goto free_skb; | |
343 | dst = skb_dst(skb); | |
344 | if (dst->hh) { | |
345 | neigh_hh_bridge(dst->hh, skb); | |
346 | skb->dev = nf_bridge->physindev; | |
347 | return br_handle_frame_finish(skb); | |
348 | } else if (dst->neighbour) { | |
349 | /* the neighbour function below overwrites the complete | |
350 | * MAC header, so we save the Ethernet source address and | |
351 | * protocol number. */ | |
352 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
353 | /* tell br_dev_xmit to continue with forwarding */ | |
354 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
355 | return dst->neighbour->output(skb); | |
356 | } | |
357 | free_skb: | |
358 | kfree_skb(skb); | |
359 | return 0; | |
360 | } | |
361 | ||
1da177e4 | 362 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 363 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
364 | * |
365 | * There are two cases to consider: | |
366 | * 1. The packet was DNAT'ed to a device in the same bridge | |
367 | * port group as it was received on. We can still bridge | |
368 | * the packet. | |
369 | * 2. The packet was DNAT'ed to a different device, either | |
370 | * a non-bridged device or another bridge port group. | |
371 | * The packet will need to be routed. | |
372 | * | |
373 | * The correct way of distinguishing between these two cases is to | |
374 | * call ip_route_input() and to look at skb->dst->dev, which is | |
375 | * changed to the destination device if ip_route_input() succeeds. | |
376 | * | |
ea2d9b41 | 377 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 378 | * |
ea2d9b41 BDS |
379 | * If the output device equals the logical bridge device the packet |
380 | * came in on, we can consider this bridging. The corresponding MAC | |
381 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
382 | * Otherwise, the packet is considered to be routed and we just |
383 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
384 | * later be passed up to the IP stack to be routed. For a redirected |
385 | * packet, ip_route_input() will give back the localhost as output device, | |
386 | * which differs from the bridge device. | |
1da177e4 | 387 | * |
ea2d9b41 | 388 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 389 | * |
f216f082 BDS |
390 | * This can be because the destination address is martian, in which case |
391 | * the packet will be dropped. | |
ea2d9b41 BDS |
392 | * If IP forwarding is disabled, ip_route_input() will fail, while |
393 | * ip_route_output_key() can return success. The source | |
394 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 395 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
396 | * if IP forwarding is enabled. If the output device equals the logical bridge |
397 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
398 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
399 | */ | |
1da177e4 LT |
400 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
401 | { | |
402 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 403 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 404 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 405 | struct rtable *rt; |
f216f082 | 406 | int err; |
1da177e4 | 407 | |
1da177e4 LT |
408 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
409 | skb->pkt_type = PACKET_OTHERHOST; | |
410 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
411 | } | |
412 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 413 | if (dnat_took_place(skb)) { |
f216f082 | 414 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
789bc3e5 | 415 | struct flowi fl = { |
5811662b CG |
416 | .fl4_dst = iph->daddr, |
417 | .fl4_tos = RT_TOS(iph->tos), | |
789bc3e5 | 418 | }; |
f3abc9b9 | 419 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
420 | |
421 | /* If err equals -EHOSTUNREACH the error is due to a | |
422 | * martian destination or due to the fact that | |
423 | * forwarding is disabled. For most martian packets, | |
424 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
425 | * martian destinations: loopback destinations and destination | |
426 | * 0.0.0.0. In both cases the packet will be dropped because the | |
427 | * destination is the loopback device and not the bridge. */ | |
428 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
429 | goto free_skb; | |
1da177e4 | 430 | |
249b6203 | 431 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
1c011bed | 432 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
433 | * require ip_forwarding. */ |
434 | if (((struct dst_entry *)rt)->dev == dev) { | |
adf30907 | 435 | skb_dst_set(skb, (struct dst_entry *)rt); |
1da177e4 LT |
436 | goto bridged_dnat; |
437 | } | |
1da177e4 LT |
438 | dst_release((struct dst_entry *)rt); |
439 | } | |
f216f082 | 440 | free_skb: |
1da177e4 LT |
441 | kfree_skb(skb); |
442 | return 0; | |
443 | } else { | |
adf30907 | 444 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 445 | bridged_dnat: |
1da177e4 | 446 | skb->dev = nf_bridge->physindev; |
e179e632 | 447 | nf_bridge_update_protocol(skb); |
fc38582d | 448 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
449 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
450 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
451 | skb, skb->dev, NULL, |
452 | br_nf_pre_routing_finish_bridge, | |
453 | 1); | |
454 | return 0; | |
455 | } | |
789bc3e5 | 456 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
457 | skb->pkt_type = PACKET_HOST; |
458 | } | |
459 | } else { | |
511c3f92 ED |
460 | rt = bridge_parent_rtable(nf_bridge->physindev); |
461 | if (!rt) { | |
4adf0af6 SW |
462 | kfree_skb(skb); |
463 | return 0; | |
464 | } | |
f9181f4f | 465 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
466 | } |
467 | ||
468 | skb->dev = nf_bridge->physindev; | |
e179e632 | 469 | nf_bridge_update_protocol(skb); |
fc38582d | 470 | nf_bridge_push_encap_header(skb); |
713aefa3 | 471 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
472 | br_handle_frame_finish, 1); |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 478 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
479 | { |
480 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
481 | ||
482 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
483 | skb->pkt_type = PACKET_HOST; | |
484 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
485 | } | |
486 | ||
487 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
488 | nf_bridge->physindev = skb->dev; | |
489 | skb->dev = bridge_parent(skb->dev); | |
e179e632 BDS |
490 | if (skb->protocol == htons(ETH_P_8021Q)) |
491 | nf_bridge->mask |= BRNF_8021Q; | |
492 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
493 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
494 | |
495 | return skb->dev; | |
1da177e4 LT |
496 | } |
497 | ||
498 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
499 | static int check_hbh_len(struct sk_buff *skb) | |
500 | { | |
0660e03f | 501 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 502 | u32 pkt_len; |
d56f90a7 ACM |
503 | const unsigned char *nh = skb_network_header(skb); |
504 | int off = raw - nh; | |
789bc3e5 | 505 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
506 | |
507 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
508 | goto bad; | |
509 | ||
510 | off += 2; | |
511 | len -= 2; | |
512 | ||
513 | while (len > 0) { | |
d56f90a7 | 514 | int optlen = nh[off + 1] + 2; |
1da177e4 | 515 | |
d56f90a7 | 516 | switch (nh[off]) { |
1da177e4 LT |
517 | case IPV6_TLV_PAD0: |
518 | optlen = 1; | |
519 | break; | |
520 | ||
521 | case IPV6_TLV_PADN: | |
522 | break; | |
523 | ||
524 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 525 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 526 | goto bad; |
d56f90a7 | 527 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 528 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 529 | ipv6_hdr(skb)->payload_len) |
b0366486 | 530 | goto bad; |
1da177e4 LT |
531 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
532 | goto bad; | |
b0366486 | 533 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 534 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 535 | goto bad; |
d56f90a7 | 536 | nh = skb_network_header(skb); |
1da177e4 LT |
537 | break; |
538 | default: | |
539 | if (optlen > len) | |
540 | goto bad; | |
541 | break; | |
542 | } | |
543 | off += optlen; | |
544 | len -= optlen; | |
545 | } | |
546 | if (len == 0) | |
547 | return 0; | |
548 | bad: | |
549 | return -1; | |
550 | ||
551 | } | |
552 | ||
553 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
554 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
555 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
556 | struct sk_buff *skb, |
557 | const struct net_device *in, | |
558 | const struct net_device *out, | |
559 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
560 | { |
561 | struct ipv6hdr *hdr; | |
562 | u32 pkt_len; | |
1da177e4 LT |
563 | |
564 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 565 | return NF_DROP; |
1da177e4 LT |
566 | |
567 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 568 | return NF_DROP; |
1da177e4 | 569 | |
0660e03f | 570 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
571 | |
572 | if (hdr->version != 6) | |
deef4b52 | 573 | return NF_DROP; |
1da177e4 LT |
574 | |
575 | pkt_len = ntohs(hdr->payload_len); | |
576 | ||
577 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
578 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 579 | return NF_DROP; |
b38dfee3 | 580 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 581 | return NF_DROP; |
1da177e4 LT |
582 | } |
583 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 584 | return NF_DROP; |
1da177e4 | 585 | |
789bc3e5 | 586 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 587 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 588 | return NF_DROP; |
5dce971a SH |
589 | if (!setup_pre_routing(skb)) |
590 | return NF_DROP; | |
1da177e4 | 591 | |
e179e632 | 592 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 593 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
594 | br_nf_pre_routing_finish_ipv6); |
595 | ||
596 | return NF_STOLEN; | |
1da177e4 LT |
597 | } |
598 | ||
599 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
600 | * Replicate the checks that IPv4 does on packet reception. | |
601 | * Set skb->dev to the bridge device (i.e. parent of the | |
602 | * receiving device) to make netfilter happy, the REDIRECT | |
603 | * target in particular. Save the original destination IP | |
604 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 605 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
606 | const struct net_device *in, |
607 | const struct net_device *out, | |
608 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 609 | { |
4df53d8b PM |
610 | struct net_bridge_port *p; |
611 | struct net_bridge *br; | |
e7c243c9 EP |
612 | __u32 len = nf_bridge_encap_header_len(skb); |
613 | ||
e7c243c9 | 614 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 615 | return NF_DROP; |
1da177e4 | 616 | |
e490c1de | 617 | p = br_port_get_rcu(in); |
4df53d8b | 618 | if (p == NULL) |
deef4b52 | 619 | return NF_DROP; |
4df53d8b PM |
620 | br = p->br; |
621 | ||
516299d2 MM |
622 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
623 | IS_PPPOE_IPV6(skb)) { | |
4df53d8b | 624 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 625 | return NF_ACCEPT; |
4df53d8b | 626 | |
fc38582d | 627 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
628 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
629 | } | |
4df53d8b PM |
630 | |
631 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 632 | return NF_ACCEPT; |
1da177e4 | 633 | |
516299d2 MM |
634 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
635 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
636 | return NF_ACCEPT; |
637 | ||
fc38582d | 638 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 639 | |
462fb2af | 640 | if (br_parse_ip_options(skb)) |
deef4b52 | 641 | return NF_DROP; |
17762060 | 642 | |
789bc3e5 | 643 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 644 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 645 | return NF_DROP; |
5dce971a SH |
646 | if (!setup_pre_routing(skb)) |
647 | return NF_DROP; | |
1da177e4 | 648 | store_orig_dstaddr(skb); |
e179e632 | 649 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 650 | |
713aefa3 | 651 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
652 | br_nf_pre_routing_finish); |
653 | ||
654 | return NF_STOLEN; | |
1da177e4 LT |
655 | } |
656 | ||
657 | ||
658 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
659 | /* The packet is locally destined, which requires a real | |
660 | * dst_entry, so detach the fake one. On the way up, the | |
661 | * packet would pass through PRE_ROUTING again (which already | |
662 | * took place when the packet entered the bridge), but we | |
663 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
664 | * prevent this from happening. */ | |
3db05fea | 665 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
666 | const struct net_device *in, |
667 | const struct net_device *out, | |
668 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 669 | { |
511c3f92 ED |
670 | struct rtable *rt = skb_rtable(skb); |
671 | ||
adf30907 ED |
672 | if (rt && rt == bridge_parent_rtable(in)) |
673 | skb_dst_drop(skb); | |
1da177e4 LT |
674 | |
675 | return NF_ACCEPT; | |
676 | } | |
677 | ||
1da177e4 LT |
678 | /* PF_BRIDGE/FORWARD *************************************************/ |
679 | static int br_nf_forward_finish(struct sk_buff *skb) | |
680 | { | |
681 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
682 | struct net_device *in; | |
1da177e4 | 683 | |
8b42ec39 | 684 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
685 | in = nf_bridge->physindev; |
686 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
687 | skb->pkt_type = PACKET_OTHERHOST; | |
688 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
689 | } | |
e94c6743 | 690 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
691 | } else { |
692 | in = *((struct net_device **)(skb->cb)); | |
693 | } | |
fc38582d | 694 | nf_bridge_push_encap_header(skb); |
e179e632 | 695 | |
713aefa3 | 696 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 697 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
698 | return 0; |
699 | } | |
700 | ||
701 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
702 | * netfilter with indev and outdev set to the bridge device, | |
703 | * but we are still able to filter on the 'real' indev/outdev | |
704 | * because of the physdev module. For ARP, indev and outdev are the | |
705 | * bridge ports. */ | |
3db05fea | 706 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
707 | const struct net_device *in, |
708 | const struct net_device *out, | |
709 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 710 | { |
1da177e4 | 711 | struct nf_bridge_info *nf_bridge; |
5dce971a | 712 | struct net_device *parent; |
76108cea | 713 | u_int8_t pf; |
1da177e4 LT |
714 | |
715 | if (!skb->nf_bridge) | |
716 | return NF_ACCEPT; | |
717 | ||
2dc2f207 PM |
718 | /* Need exclusive nf_bridge_info since we might have multiple |
719 | * different physoutdevs. */ | |
720 | if (!nf_bridge_unshare(skb)) | |
721 | return NF_DROP; | |
722 | ||
5dce971a SH |
723 | parent = bridge_parent(out); |
724 | if (!parent) | |
725 | return NF_DROP; | |
726 | ||
516299d2 MM |
727 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
728 | IS_PPPOE_IP(skb)) | |
1da177e4 | 729 | pf = PF_INET; |
a2bd40ad HX |
730 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
731 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 732 | pf = PF_INET6; |
a2bd40ad HX |
733 | else |
734 | return NF_ACCEPT; | |
1da177e4 | 735 | |
3db05fea | 736 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 737 | |
1da177e4 LT |
738 | nf_bridge = skb->nf_bridge; |
739 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
740 | skb->pkt_type = PACKET_HOST; | |
741 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
742 | } | |
743 | ||
744 | /* The physdev module checks on this */ | |
745 | nf_bridge->mask |= BRNF_BRIDGED; | |
746 | nf_bridge->physoutdev = skb->dev; | |
e179e632 BDS |
747 | if (pf == PF_INET) |
748 | skb->protocol = htons(ETH_P_IP); | |
749 | else | |
750 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 751 | |
6e23ae2a | 752 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 753 | br_nf_forward_finish); |
1da177e4 LT |
754 | |
755 | return NF_STOLEN; | |
756 | } | |
757 | ||
3db05fea | 758 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
759 | const struct net_device *in, |
760 | const struct net_device *out, | |
761 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 762 | { |
4df53d8b PM |
763 | struct net_bridge_port *p; |
764 | struct net_bridge *br; | |
1da177e4 LT |
765 | struct net_device **d = (struct net_device **)(skb->cb); |
766 | ||
e490c1de | 767 | p = br_port_get_rcu(out); |
4df53d8b PM |
768 | if (p == NULL) |
769 | return NF_ACCEPT; | |
770 | br = p->br; | |
771 | ||
772 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 773 | return NF_ACCEPT; |
1da177e4 | 774 | |
f8a26028 | 775 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 776 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 777 | return NF_ACCEPT; |
3db05fea | 778 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
779 | } |
780 | ||
d0a92be0 | 781 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 782 | if (IS_VLAN_ARP(skb)) |
3db05fea | 783 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
784 | return NF_ACCEPT; |
785 | } | |
786 | *d = (struct net_device *)in; | |
fdc9314c | 787 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
788 | (struct net_device *)out, br_nf_forward_finish); |
789 | ||
790 | return NF_STOLEN; | |
791 | } | |
792 | ||
c197facc | 793 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
2e2f7aef PM |
794 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
795 | { | |
462fb2af BD |
796 | int ret; |
797 | ||
e179e632 | 798 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 799 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 800 | !skb_is_gso(skb)) { |
462fb2af BD |
801 | if (br_parse_ip_options(skb)) |
802 | /* Drop invalid packet */ | |
803 | return NF_DROP; | |
804 | ret = ip_fragment(skb, br_dev_queue_push_xmit); | |
87f94b4e | 805 | } else |
462fb2af BD |
806 | ret = br_dev_queue_push_xmit(skb); |
807 | ||
808 | return ret; | |
2e2f7aef | 809 | } |
c197facc | 810 | #else |
811 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
812 | { | |
813 | return br_dev_queue_push_xmit(skb); | |
814 | } | |
815 | #endif | |
1da177e4 LT |
816 | |
817 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 818 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
819 | const struct net_device *in, |
820 | const struct net_device *out, | |
821 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 822 | { |
3db05fea | 823 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 824 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 825 | u_int8_t pf; |
1da177e4 | 826 | |
ea2d9b41 | 827 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
828 | return NF_ACCEPT; |
829 | ||
5dce971a SH |
830 | if (!realoutdev) |
831 | return NF_DROP; | |
832 | ||
516299d2 MM |
833 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
834 | IS_PPPOE_IP(skb)) | |
1da177e4 | 835 | pf = PF_INET; |
a2bd40ad HX |
836 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
837 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 838 | pf = PF_INET6; |
a2bd40ad HX |
839 | else |
840 | return NF_ACCEPT; | |
1da177e4 | 841 | |
1da177e4 LT |
842 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
843 | * about the value of skb->pkt_type. */ | |
844 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
845 | skb->pkt_type = PACKET_HOST; | |
846 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
847 | } | |
848 | ||
fc38582d | 849 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 850 | nf_bridge_save_header(skb); |
e179e632 BDS |
851 | if (pf == PF_INET) |
852 | skb->protocol = htons(ETH_P_IP); | |
853 | else | |
854 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 855 | |
6e23ae2a | 856 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 857 | br_nf_dev_queue_xmit); |
1da177e4 LT |
858 | |
859 | return NF_STOLEN; | |
1da177e4 LT |
860 | } |
861 | ||
1da177e4 LT |
862 | /* IP/SABOTAGE *****************************************************/ |
863 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
864 | * for the second time. */ | |
3db05fea | 865 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
866 | const struct net_device *in, |
867 | const struct net_device *out, | |
868 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 869 | { |
3db05fea HX |
870 | if (skb->nf_bridge && |
871 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
872 | return NF_STOP; |
873 | } | |
874 | ||
875 | return NF_ACCEPT; | |
876 | } | |
877 | ||
ea2d9b41 BDS |
878 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
879 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 880 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
881 | { |
882 | .hook = br_nf_pre_routing, | |
883 | .owner = THIS_MODULE, | |
884 | .pf = PF_BRIDGE, | |
885 | .hooknum = NF_BR_PRE_ROUTING, | |
886 | .priority = NF_BR_PRI_BRNF, | |
887 | }, | |
888 | { | |
889 | .hook = br_nf_local_in, | |
890 | .owner = THIS_MODULE, | |
891 | .pf = PF_BRIDGE, | |
892 | .hooknum = NF_BR_LOCAL_IN, | |
893 | .priority = NF_BR_PRI_BRNF, | |
894 | }, | |
895 | { | |
896 | .hook = br_nf_forward_ip, | |
897 | .owner = THIS_MODULE, | |
898 | .pf = PF_BRIDGE, | |
899 | .hooknum = NF_BR_FORWARD, | |
900 | .priority = NF_BR_PRI_BRNF - 1, | |
901 | }, | |
902 | { | |
903 | .hook = br_nf_forward_arp, | |
904 | .owner = THIS_MODULE, | |
905 | .pf = PF_BRIDGE, | |
906 | .hooknum = NF_BR_FORWARD, | |
907 | .priority = NF_BR_PRI_BRNF, | |
908 | }, | |
1490fd89 CG |
909 | { |
910 | .hook = br_nf_post_routing, | |
911 | .owner = THIS_MODULE, | |
912 | .pf = PF_BRIDGE, | |
913 | .hooknum = NF_BR_POST_ROUTING, | |
914 | .priority = NF_BR_PRI_LAST, | |
915 | }, | |
916 | { | |
917 | .hook = ip_sabotage_in, | |
918 | .owner = THIS_MODULE, | |
919 | .pf = PF_INET, | |
920 | .hooknum = NF_INET_PRE_ROUTING, | |
921 | .priority = NF_IP_PRI_FIRST, | |
922 | }, | |
923 | { | |
924 | .hook = ip_sabotage_in, | |
925 | .owner = THIS_MODULE, | |
926 | .pf = PF_INET6, | |
927 | .hooknum = NF_INET_PRE_ROUTING, | |
928 | .priority = NF_IP6_PRI_FIRST, | |
929 | }, | |
1da177e4 LT |
930 | }; |
931 | ||
932 | #ifdef CONFIG_SYSCTL | |
933 | static | |
8d65af78 | 934 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 935 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
936 | { |
937 | int ret; | |
938 | ||
8d65af78 | 939 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
940 | |
941 | if (write && *(int *)(ctl->data)) | |
942 | *(int *)(ctl->data) = 1; | |
943 | return ret; | |
944 | } | |
945 | ||
946 | static ctl_table brnf_table[] = { | |
947 | { | |
1da177e4 LT |
948 | .procname = "bridge-nf-call-arptables", |
949 | .data = &brnf_call_arptables, | |
950 | .maxlen = sizeof(int), | |
951 | .mode = 0644, | |
6d9f239a | 952 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
953 | }, |
954 | { | |
1da177e4 LT |
955 | .procname = "bridge-nf-call-iptables", |
956 | .data = &brnf_call_iptables, | |
957 | .maxlen = sizeof(int), | |
958 | .mode = 0644, | |
6d9f239a | 959 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
960 | }, |
961 | { | |
1da177e4 LT |
962 | .procname = "bridge-nf-call-ip6tables", |
963 | .data = &brnf_call_ip6tables, | |
964 | .maxlen = sizeof(int), | |
965 | .mode = 0644, | |
6d9f239a | 966 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
967 | }, |
968 | { | |
1da177e4 LT |
969 | .procname = "bridge-nf-filter-vlan-tagged", |
970 | .data = &brnf_filter_vlan_tagged, | |
971 | .maxlen = sizeof(int), | |
972 | .mode = 0644, | |
6d9f239a | 973 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
974 | }, |
975 | { | |
516299d2 MM |
976 | .procname = "bridge-nf-filter-pppoe-tagged", |
977 | .data = &brnf_filter_pppoe_tagged, | |
978 | .maxlen = sizeof(int), | |
979 | .mode = 0644, | |
6d9f239a | 980 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 981 | }, |
f8572d8f | 982 | { } |
1da177e4 LT |
983 | }; |
984 | ||
b5ccd792 | 985 | static struct ctl_path brnf_path[] = { |
f8572d8f EB |
986 | { .procname = "net", }, |
987 | { .procname = "bridge", }, | |
b5ccd792 | 988 | { } |
1da177e4 LT |
989 | }; |
990 | #endif | |
991 | ||
5eb87f45 | 992 | int __init br_netfilter_init(void) |
1da177e4 | 993 | { |
5eb87f45 | 994 | int ret; |
1da177e4 | 995 | |
fc66f95c | 996 | ret = dst_entries_init(&fake_dst_ops); |
5eb87f45 | 997 | if (ret < 0) |
1da177e4 | 998 | return ret; |
fc66f95c ED |
999 | |
1000 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
1001 | if (ret < 0) { | |
1002 | dst_entries_destroy(&fake_dst_ops); | |
1003 | return ret; | |
1004 | } | |
1da177e4 | 1005 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 1006 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 1007 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1008 | printk(KERN_WARNING |
1009 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 | 1010 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
fc66f95c | 1011 | dst_entries_destroy(&fake_dst_ops); |
5eb87f45 | 1012 | return -ENOMEM; |
1da177e4 LT |
1013 | } |
1014 | #endif | |
1da177e4 | 1015 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1016 | return 0; |
1017 | } | |
1018 | ||
1019 | void br_netfilter_fini(void) | |
1020 | { | |
5eb87f45 | 1021 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
1022 | #ifdef CONFIG_SYSCTL |
1023 | unregister_sysctl_table(brnf_sysctl_header); | |
1024 | #endif | |
fc66f95c | 1025 | dst_entries_destroy(&fake_dst_ops); |
1da177e4 | 1026 | } |