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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))) { |
f3abc9b9 | 415 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
416 | |
417 | /* If err equals -EHOSTUNREACH the error is due to a | |
418 | * martian destination or due to the fact that | |
419 | * forwarding is disabled. For most martian packets, | |
420 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
421 | * martian destinations: loopback destinations and destination | |
422 | * 0.0.0.0. In both cases the packet will be dropped because the | |
423 | * destination is the loopback device and not the bridge. */ | |
424 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
425 | goto free_skb; | |
1da177e4 | 426 | |
78fbfd8a DM |
427 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
428 | RT_TOS(iph->tos), 0); | |
b23dd4fe | 429 | if (!IS_ERR(rt)) { |
1c011bed | 430 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 431 | * require ip_forwarding. */ |
b23dd4fe DM |
432 | if (rt->dst.dev == dev) { |
433 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
434 | goto bridged_dnat; |
435 | } | |
b23dd4fe | 436 | ip_rt_put(rt); |
1da177e4 | 437 | } |
f216f082 | 438 | free_skb: |
1da177e4 LT |
439 | kfree_skb(skb); |
440 | return 0; | |
441 | } else { | |
adf30907 | 442 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 443 | bridged_dnat: |
1da177e4 | 444 | skb->dev = nf_bridge->physindev; |
e179e632 | 445 | nf_bridge_update_protocol(skb); |
fc38582d | 446 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
447 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
448 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
449 | skb, skb->dev, NULL, |
450 | br_nf_pre_routing_finish_bridge, | |
451 | 1); | |
452 | return 0; | |
453 | } | |
789bc3e5 | 454 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
455 | skb->pkt_type = PACKET_HOST; |
456 | } | |
457 | } else { | |
511c3f92 ED |
458 | rt = bridge_parent_rtable(nf_bridge->physindev); |
459 | if (!rt) { | |
4adf0af6 SW |
460 | kfree_skb(skb); |
461 | return 0; | |
462 | } | |
f9181f4f | 463 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
464 | } |
465 | ||
466 | skb->dev = nf_bridge->physindev; | |
e179e632 | 467 | nf_bridge_update_protocol(skb); |
fc38582d | 468 | nf_bridge_push_encap_header(skb); |
713aefa3 | 469 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
470 | br_handle_frame_finish, 1); |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 476 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
477 | { |
478 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
479 | ||
480 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
481 | skb->pkt_type = PACKET_HOST; | |
482 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
483 | } | |
484 | ||
485 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
486 | nf_bridge->physindev = skb->dev; | |
487 | skb->dev = bridge_parent(skb->dev); | |
e179e632 BDS |
488 | if (skb->protocol == htons(ETH_P_8021Q)) |
489 | nf_bridge->mask |= BRNF_8021Q; | |
490 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
491 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
492 | |
493 | return skb->dev; | |
1da177e4 LT |
494 | } |
495 | ||
496 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
497 | static int check_hbh_len(struct sk_buff *skb) | |
498 | { | |
0660e03f | 499 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 500 | u32 pkt_len; |
d56f90a7 ACM |
501 | const unsigned char *nh = skb_network_header(skb); |
502 | int off = raw - nh; | |
789bc3e5 | 503 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
504 | |
505 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
506 | goto bad; | |
507 | ||
508 | off += 2; | |
509 | len -= 2; | |
510 | ||
511 | while (len > 0) { | |
d56f90a7 | 512 | int optlen = nh[off + 1] + 2; |
1da177e4 | 513 | |
d56f90a7 | 514 | switch (nh[off]) { |
1da177e4 LT |
515 | case IPV6_TLV_PAD0: |
516 | optlen = 1; | |
517 | break; | |
518 | ||
519 | case IPV6_TLV_PADN: | |
520 | break; | |
521 | ||
522 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 523 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 524 | goto bad; |
d56f90a7 | 525 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 526 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 527 | ipv6_hdr(skb)->payload_len) |
b0366486 | 528 | goto bad; |
1da177e4 LT |
529 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
530 | goto bad; | |
b0366486 | 531 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 532 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 533 | goto bad; |
d56f90a7 | 534 | nh = skb_network_header(skb); |
1da177e4 LT |
535 | break; |
536 | default: | |
537 | if (optlen > len) | |
538 | goto bad; | |
539 | break; | |
540 | } | |
541 | off += optlen; | |
542 | len -= optlen; | |
543 | } | |
544 | if (len == 0) | |
545 | return 0; | |
546 | bad: | |
547 | return -1; | |
548 | ||
549 | } | |
550 | ||
551 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
552 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
553 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
554 | struct sk_buff *skb, |
555 | const struct net_device *in, | |
556 | const struct net_device *out, | |
557 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
558 | { |
559 | struct ipv6hdr *hdr; | |
560 | u32 pkt_len; | |
1da177e4 LT |
561 | |
562 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 563 | return NF_DROP; |
1da177e4 LT |
564 | |
565 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 566 | return NF_DROP; |
1da177e4 | 567 | |
0660e03f | 568 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
569 | |
570 | if (hdr->version != 6) | |
deef4b52 | 571 | return NF_DROP; |
1da177e4 LT |
572 | |
573 | pkt_len = ntohs(hdr->payload_len); | |
574 | ||
575 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
576 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 577 | return NF_DROP; |
b38dfee3 | 578 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 579 | return NF_DROP; |
1da177e4 LT |
580 | } |
581 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 582 | return NF_DROP; |
1da177e4 | 583 | |
789bc3e5 | 584 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 585 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 586 | return NF_DROP; |
5dce971a SH |
587 | if (!setup_pre_routing(skb)) |
588 | return NF_DROP; | |
1da177e4 | 589 | |
e179e632 | 590 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 591 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
592 | br_nf_pre_routing_finish_ipv6); |
593 | ||
594 | return NF_STOLEN; | |
1da177e4 LT |
595 | } |
596 | ||
597 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
598 | * Replicate the checks that IPv4 does on packet reception. | |
599 | * Set skb->dev to the bridge device (i.e. parent of the | |
600 | * receiving device) to make netfilter happy, the REDIRECT | |
601 | * target in particular. Save the original destination IP | |
602 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 603 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
604 | const struct net_device *in, |
605 | const struct net_device *out, | |
606 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 607 | { |
4df53d8b PM |
608 | struct net_bridge_port *p; |
609 | struct net_bridge *br; | |
e7c243c9 EP |
610 | __u32 len = nf_bridge_encap_header_len(skb); |
611 | ||
e7c243c9 | 612 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 613 | return NF_DROP; |
1da177e4 | 614 | |
e490c1de | 615 | p = br_port_get_rcu(in); |
4df53d8b | 616 | if (p == NULL) |
deef4b52 | 617 | return NF_DROP; |
4df53d8b PM |
618 | br = p->br; |
619 | ||
516299d2 MM |
620 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
621 | IS_PPPOE_IPV6(skb)) { | |
4df53d8b | 622 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 623 | return NF_ACCEPT; |
4df53d8b | 624 | |
fc38582d | 625 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
626 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
627 | } | |
4df53d8b PM |
628 | |
629 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 630 | return NF_ACCEPT; |
1da177e4 | 631 | |
516299d2 MM |
632 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
633 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
634 | return NF_ACCEPT; |
635 | ||
fc38582d | 636 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 637 | |
462fb2af | 638 | if (br_parse_ip_options(skb)) |
deef4b52 | 639 | return NF_DROP; |
17762060 | 640 | |
789bc3e5 | 641 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 642 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 643 | return NF_DROP; |
5dce971a SH |
644 | if (!setup_pre_routing(skb)) |
645 | return NF_DROP; | |
1da177e4 | 646 | store_orig_dstaddr(skb); |
e179e632 | 647 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 648 | |
713aefa3 | 649 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
650 | br_nf_pre_routing_finish); |
651 | ||
652 | return NF_STOLEN; | |
1da177e4 LT |
653 | } |
654 | ||
655 | ||
656 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
657 | /* The packet is locally destined, which requires a real | |
658 | * dst_entry, so detach the fake one. On the way up, the | |
659 | * packet would pass through PRE_ROUTING again (which already | |
660 | * took place when the packet entered the bridge), but we | |
661 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
662 | * prevent this from happening. */ | |
3db05fea | 663 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
664 | const struct net_device *in, |
665 | const struct net_device *out, | |
666 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 667 | { |
511c3f92 ED |
668 | struct rtable *rt = skb_rtable(skb); |
669 | ||
adf30907 ED |
670 | if (rt && rt == bridge_parent_rtable(in)) |
671 | skb_dst_drop(skb); | |
1da177e4 LT |
672 | |
673 | return NF_ACCEPT; | |
674 | } | |
675 | ||
1da177e4 LT |
676 | /* PF_BRIDGE/FORWARD *************************************************/ |
677 | static int br_nf_forward_finish(struct sk_buff *skb) | |
678 | { | |
679 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
680 | struct net_device *in; | |
1da177e4 | 681 | |
8b42ec39 | 682 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
683 | in = nf_bridge->physindev; |
684 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
685 | skb->pkt_type = PACKET_OTHERHOST; | |
686 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
687 | } | |
e94c6743 | 688 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
689 | } else { |
690 | in = *((struct net_device **)(skb->cb)); | |
691 | } | |
fc38582d | 692 | nf_bridge_push_encap_header(skb); |
e179e632 | 693 | |
713aefa3 | 694 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 695 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
696 | return 0; |
697 | } | |
698 | ||
699 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
700 | * netfilter with indev and outdev set to the bridge device, | |
701 | * but we are still able to filter on the 'real' indev/outdev | |
702 | * because of the physdev module. For ARP, indev and outdev are the | |
703 | * bridge ports. */ | |
3db05fea | 704 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
705 | const struct net_device *in, |
706 | const struct net_device *out, | |
707 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 708 | { |
1da177e4 | 709 | struct nf_bridge_info *nf_bridge; |
5dce971a | 710 | struct net_device *parent; |
76108cea | 711 | u_int8_t pf; |
1da177e4 LT |
712 | |
713 | if (!skb->nf_bridge) | |
714 | return NF_ACCEPT; | |
715 | ||
2dc2f207 PM |
716 | /* Need exclusive nf_bridge_info since we might have multiple |
717 | * different physoutdevs. */ | |
718 | if (!nf_bridge_unshare(skb)) | |
719 | return NF_DROP; | |
720 | ||
5dce971a SH |
721 | parent = bridge_parent(out); |
722 | if (!parent) | |
723 | return NF_DROP; | |
724 | ||
516299d2 MM |
725 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
726 | IS_PPPOE_IP(skb)) | |
1da177e4 | 727 | pf = PF_INET; |
a2bd40ad HX |
728 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
729 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 730 | pf = PF_INET6; |
a2bd40ad HX |
731 | else |
732 | return NF_ACCEPT; | |
1da177e4 | 733 | |
3db05fea | 734 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 735 | |
1da177e4 LT |
736 | nf_bridge = skb->nf_bridge; |
737 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
738 | skb->pkt_type = PACKET_HOST; | |
739 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
740 | } | |
741 | ||
6b1e960f HX |
742 | if (br_parse_ip_options(skb)) |
743 | return NF_DROP; | |
744 | ||
1da177e4 LT |
745 | /* The physdev module checks on this */ |
746 | nf_bridge->mask |= BRNF_BRIDGED; | |
747 | nf_bridge->physoutdev = skb->dev; | |
e179e632 BDS |
748 | if (pf == PF_INET) |
749 | skb->protocol = htons(ETH_P_IP); | |
750 | else | |
751 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 752 | |
6e23ae2a | 753 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 754 | br_nf_forward_finish); |
1da177e4 LT |
755 | |
756 | return NF_STOLEN; | |
757 | } | |
758 | ||
3db05fea | 759 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
760 | const struct net_device *in, |
761 | const struct net_device *out, | |
762 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 763 | { |
4df53d8b PM |
764 | struct net_bridge_port *p; |
765 | struct net_bridge *br; | |
1da177e4 LT |
766 | struct net_device **d = (struct net_device **)(skb->cb); |
767 | ||
e490c1de | 768 | p = br_port_get_rcu(out); |
4df53d8b PM |
769 | if (p == NULL) |
770 | return NF_ACCEPT; | |
771 | br = p->br; | |
772 | ||
773 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 774 | return NF_ACCEPT; |
1da177e4 | 775 | |
f8a26028 | 776 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 777 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 778 | return NF_ACCEPT; |
3db05fea | 779 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
780 | } |
781 | ||
d0a92be0 | 782 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 783 | if (IS_VLAN_ARP(skb)) |
3db05fea | 784 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
785 | return NF_ACCEPT; |
786 | } | |
787 | *d = (struct net_device *)in; | |
fdc9314c | 788 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
789 | (struct net_device *)out, br_nf_forward_finish); |
790 | ||
791 | return NF_STOLEN; | |
792 | } | |
793 | ||
c197facc | 794 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
2e2f7aef PM |
795 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
796 | { | |
462fb2af BD |
797 | int ret; |
798 | ||
e179e632 | 799 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 800 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 801 | !skb_is_gso(skb)) { |
462fb2af BD |
802 | if (br_parse_ip_options(skb)) |
803 | /* Drop invalid packet */ | |
804 | return NF_DROP; | |
805 | ret = ip_fragment(skb, br_dev_queue_push_xmit); | |
87f94b4e | 806 | } else |
462fb2af BD |
807 | ret = br_dev_queue_push_xmit(skb); |
808 | ||
809 | return ret; | |
2e2f7aef | 810 | } |
c197facc | 811 | #else |
812 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
813 | { | |
814 | return br_dev_queue_push_xmit(skb); | |
815 | } | |
816 | #endif | |
1da177e4 LT |
817 | |
818 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 819 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
820 | const struct net_device *in, |
821 | const struct net_device *out, | |
822 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 823 | { |
3db05fea | 824 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 825 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 826 | u_int8_t pf; |
1da177e4 | 827 | |
ea2d9b41 | 828 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
829 | return NF_ACCEPT; |
830 | ||
5dce971a SH |
831 | if (!realoutdev) |
832 | return NF_DROP; | |
833 | ||
516299d2 MM |
834 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
835 | IS_PPPOE_IP(skb)) | |
1da177e4 | 836 | pf = PF_INET; |
a2bd40ad HX |
837 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
838 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 839 | pf = PF_INET6; |
a2bd40ad HX |
840 | else |
841 | return NF_ACCEPT; | |
1da177e4 | 842 | |
1da177e4 LT |
843 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
844 | * about the value of skb->pkt_type. */ | |
845 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
846 | skb->pkt_type = PACKET_HOST; | |
847 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
848 | } | |
849 | ||
fc38582d | 850 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 851 | nf_bridge_save_header(skb); |
e179e632 BDS |
852 | if (pf == PF_INET) |
853 | skb->protocol = htons(ETH_P_IP); | |
854 | else | |
855 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 856 | |
6e23ae2a | 857 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 858 | br_nf_dev_queue_xmit); |
1da177e4 LT |
859 | |
860 | return NF_STOLEN; | |
1da177e4 LT |
861 | } |
862 | ||
1da177e4 LT |
863 | /* IP/SABOTAGE *****************************************************/ |
864 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
865 | * for the second time. */ | |
3db05fea | 866 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
867 | const struct net_device *in, |
868 | const struct net_device *out, | |
869 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 870 | { |
3db05fea HX |
871 | if (skb->nf_bridge && |
872 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
873 | return NF_STOP; |
874 | } | |
875 | ||
876 | return NF_ACCEPT; | |
877 | } | |
878 | ||
ea2d9b41 BDS |
879 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
880 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 881 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
882 | { |
883 | .hook = br_nf_pre_routing, | |
884 | .owner = THIS_MODULE, | |
885 | .pf = PF_BRIDGE, | |
886 | .hooknum = NF_BR_PRE_ROUTING, | |
887 | .priority = NF_BR_PRI_BRNF, | |
888 | }, | |
889 | { | |
890 | .hook = br_nf_local_in, | |
891 | .owner = THIS_MODULE, | |
892 | .pf = PF_BRIDGE, | |
893 | .hooknum = NF_BR_LOCAL_IN, | |
894 | .priority = NF_BR_PRI_BRNF, | |
895 | }, | |
896 | { | |
897 | .hook = br_nf_forward_ip, | |
898 | .owner = THIS_MODULE, | |
899 | .pf = PF_BRIDGE, | |
900 | .hooknum = NF_BR_FORWARD, | |
901 | .priority = NF_BR_PRI_BRNF - 1, | |
902 | }, | |
903 | { | |
904 | .hook = br_nf_forward_arp, | |
905 | .owner = THIS_MODULE, | |
906 | .pf = PF_BRIDGE, | |
907 | .hooknum = NF_BR_FORWARD, | |
908 | .priority = NF_BR_PRI_BRNF, | |
909 | }, | |
1490fd89 CG |
910 | { |
911 | .hook = br_nf_post_routing, | |
912 | .owner = THIS_MODULE, | |
913 | .pf = PF_BRIDGE, | |
914 | .hooknum = NF_BR_POST_ROUTING, | |
915 | .priority = NF_BR_PRI_LAST, | |
916 | }, | |
917 | { | |
918 | .hook = ip_sabotage_in, | |
919 | .owner = THIS_MODULE, | |
920 | .pf = PF_INET, | |
921 | .hooknum = NF_INET_PRE_ROUTING, | |
922 | .priority = NF_IP_PRI_FIRST, | |
923 | }, | |
924 | { | |
925 | .hook = ip_sabotage_in, | |
926 | .owner = THIS_MODULE, | |
927 | .pf = PF_INET6, | |
928 | .hooknum = NF_INET_PRE_ROUTING, | |
929 | .priority = NF_IP6_PRI_FIRST, | |
930 | }, | |
1da177e4 LT |
931 | }; |
932 | ||
933 | #ifdef CONFIG_SYSCTL | |
934 | static | |
8d65af78 | 935 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 936 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
937 | { |
938 | int ret; | |
939 | ||
8d65af78 | 940 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
941 | |
942 | if (write && *(int *)(ctl->data)) | |
943 | *(int *)(ctl->data) = 1; | |
944 | return ret; | |
945 | } | |
946 | ||
947 | static ctl_table brnf_table[] = { | |
948 | { | |
1da177e4 LT |
949 | .procname = "bridge-nf-call-arptables", |
950 | .data = &brnf_call_arptables, | |
951 | .maxlen = sizeof(int), | |
952 | .mode = 0644, | |
6d9f239a | 953 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
954 | }, |
955 | { | |
1da177e4 LT |
956 | .procname = "bridge-nf-call-iptables", |
957 | .data = &brnf_call_iptables, | |
958 | .maxlen = sizeof(int), | |
959 | .mode = 0644, | |
6d9f239a | 960 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
961 | }, |
962 | { | |
1da177e4 LT |
963 | .procname = "bridge-nf-call-ip6tables", |
964 | .data = &brnf_call_ip6tables, | |
965 | .maxlen = sizeof(int), | |
966 | .mode = 0644, | |
6d9f239a | 967 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
968 | }, |
969 | { | |
1da177e4 LT |
970 | .procname = "bridge-nf-filter-vlan-tagged", |
971 | .data = &brnf_filter_vlan_tagged, | |
972 | .maxlen = sizeof(int), | |
973 | .mode = 0644, | |
6d9f239a | 974 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
975 | }, |
976 | { | |
516299d2 MM |
977 | .procname = "bridge-nf-filter-pppoe-tagged", |
978 | .data = &brnf_filter_pppoe_tagged, | |
979 | .maxlen = sizeof(int), | |
980 | .mode = 0644, | |
6d9f239a | 981 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 982 | }, |
f8572d8f | 983 | { } |
1da177e4 LT |
984 | }; |
985 | ||
b5ccd792 | 986 | static struct ctl_path brnf_path[] = { |
f8572d8f EB |
987 | { .procname = "net", }, |
988 | { .procname = "bridge", }, | |
b5ccd792 | 989 | { } |
1da177e4 LT |
990 | }; |
991 | #endif | |
992 | ||
5eb87f45 | 993 | int __init br_netfilter_init(void) |
1da177e4 | 994 | { |
5eb87f45 | 995 | int ret; |
1da177e4 | 996 | |
fc66f95c | 997 | ret = dst_entries_init(&fake_dst_ops); |
5eb87f45 | 998 | if (ret < 0) |
1da177e4 | 999 | return ret; |
fc66f95c ED |
1000 | |
1001 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
1002 | if (ret < 0) { | |
1003 | dst_entries_destroy(&fake_dst_ops); | |
1004 | return ret; | |
1005 | } | |
1da177e4 | 1006 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 1007 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 1008 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1009 | printk(KERN_WARNING |
1010 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 | 1011 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
fc66f95c | 1012 | dst_entries_destroy(&fake_dst_ops); |
5eb87f45 | 1013 | return -ENOMEM; |
1da177e4 LT |
1014 | } |
1015 | #endif | |
1da177e4 | 1016 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1017 | return 0; |
1018 | } | |
1019 | ||
1020 | void br_netfilter_fini(void) | |
1021 | { | |
5eb87f45 | 1022 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
1023 | #ifdef CONFIG_SYSCTL |
1024 | unregister_sysctl_table(brnf_sysctl_header); | |
1025 | #endif | |
fc66f95c | 1026 | dst_entries_destroy(&fake_dst_ops); |
1da177e4 | 1027 | } |