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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 SH |
66 | { |
67 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
68 | } | |
69 | ||
70 | #define IS_VLAN_IP(skb) \ | |
71 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
9d6f229f | 72 | vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
73 | brnf_filter_vlan_tagged) |
74 | ||
75 | #define IS_VLAN_IPV6(skb) \ | |
76 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
77 | vlan_proto(skb) == htons(ETH_P_IPV6) &&\ | |
78 | brnf_filter_vlan_tagged) | |
79 | ||
80 | #define IS_VLAN_ARP(skb) \ | |
81 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
82 | vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
83 | brnf_filter_vlan_tagged) | |
1da177e4 | 84 | |
516299d2 MM |
85 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
86 | { | |
87 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
88 | sizeof(struct pppoe_hdr))); | |
89 | } | |
90 | ||
91 | #define IS_PPPOE_IP(skb) \ | |
92 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
93 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
94 | brnf_filter_pppoe_tagged) | |
95 | ||
96 | #define IS_PPPOE_IPV6(skb) \ | |
97 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
98 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
99 | brnf_filter_pppoe_tagged) | |
100 | ||
631339f1 HX |
101 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
102 | { | |
103 | } | |
104 | ||
105 | static struct dst_ops fake_dst_ops = { | |
106 | .family = AF_INET, | |
09640e63 | 107 | .protocol = cpu_to_be16(ETH_P_IP), |
631339f1 | 108 | .update_pmtu = fake_update_pmtu, |
631339f1 HX |
109 | .entries = ATOMIC_INIT(0), |
110 | }; | |
111 | ||
4adf0af6 SW |
112 | /* |
113 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
114 | * Currently, we fill in the PMTU entry because netfilter |
115 | * refragmentation needs it, and the rt_flags entry because | |
116 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
117 | * require us to fill additional fields. |
118 | */ | |
119 | void br_netfilter_rtable_init(struct net_bridge *br) | |
120 | { | |
121 | struct rtable *rt = &br->fake_rtable; | |
122 | ||
d8d1f30b CG |
123 | atomic_set(&rt->dst.__refcnt, 1); |
124 | rt->dst.dev = br->dev; | |
125 | rt->dst.path = &rt->dst; | |
126 | rt->dst.metrics[RTAX_MTU - 1] = 1500; | |
127 | rt->dst.flags = DST_NOXFRM; | |
128 | rt->dst.ops = &fake_dst_ops; | |
4adf0af6 SW |
129 | } |
130 | ||
131 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
132 | { | |
f350a0a8 JP |
133 | if (!br_port_exists(dev)) |
134 | return NULL; | |
135 | return &br_port_get_rcu(dev)->br->fake_rtable; | |
4adf0af6 | 136 | } |
1da177e4 | 137 | |
5dce971a SH |
138 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
139 | { | |
f350a0a8 JP |
140 | if (!br_port_exists(dev)) |
141 | return NULL; | |
5dce971a | 142 | |
f350a0a8 | 143 | return br_port_get_rcu(dev)->br->dev; |
5dce971a | 144 | } |
1da177e4 | 145 | |
fdeabdef SH |
146 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
147 | { | |
148 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
149 | if (likely(skb->nf_bridge)) | |
150 | atomic_set(&(skb->nf_bridge->use), 1); | |
151 | ||
152 | return skb->nf_bridge; | |
153 | } | |
154 | ||
2dc2f207 PM |
155 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
156 | { | |
157 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
158 | ||
159 | if (atomic_read(&nf_bridge->use) > 1) { | |
160 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
161 | ||
162 | if (tmp) { | |
163 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
164 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 165 | } |
4c3a76ab | 166 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
167 | nf_bridge = tmp; |
168 | } | |
169 | return nf_bridge; | |
170 | } | |
171 | ||
fc38582d PM |
172 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
173 | { | |
174 | unsigned int len = nf_bridge_encap_header_len(skb); | |
175 | ||
176 | skb_push(skb, len); | |
177 | skb->network_header -= len; | |
178 | } | |
179 | ||
180 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 181 | { |
fc38582d PM |
182 | unsigned int len = nf_bridge_encap_header_len(skb); |
183 | ||
184 | skb_pull(skb, len); | |
185 | skb->network_header += len; | |
186 | } | |
fdeabdef | 187 | |
fc38582d PM |
188 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
189 | { | |
190 | unsigned int len = nf_bridge_encap_header_len(skb); | |
191 | ||
192 | skb_pull_rcsum(skb, len); | |
193 | skb->network_header += len; | |
194 | } | |
195 | ||
196 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
197 | { | |
198 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 199 | |
d626f62b ACM |
200 | skb_copy_from_linear_data_offset(skb, -header_size, |
201 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
202 | } |
203 | ||
e179e632 BDS |
204 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
205 | { | |
206 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
207 | skb->protocol = htons(ETH_P_8021Q); | |
208 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
209 | skb->protocol = htons(ETH_P_PPP_SES); | |
210 | } | |
211 | ||
462fb2af BD |
212 | /* When handing a packet over to the IP layer |
213 | * check whether we have a skb that is in the | |
214 | * expected format | |
215 | */ | |
216 | ||
217 | int br_parse_ip_options(struct sk_buff *skb) | |
218 | { | |
219 | struct ip_options *opt; | |
220 | struct iphdr *iph; | |
221 | struct net_device *dev = skb->dev; | |
222 | u32 len; | |
223 | ||
224 | iph = ip_hdr(skb); | |
225 | opt = &(IPCB(skb)->opt); | |
226 | ||
227 | /* Basic sanity checks */ | |
228 | if (iph->ihl < 5 || iph->version != 4) | |
229 | goto inhdr_error; | |
230 | ||
231 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
232 | goto inhdr_error; | |
233 | ||
234 | iph = ip_hdr(skb); | |
235 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
236 | goto inhdr_error; | |
237 | ||
238 | len = ntohs(iph->tot_len); | |
239 | if (skb->len < len) { | |
240 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
241 | goto drop; | |
242 | } else if (len < (iph->ihl*4)) | |
243 | goto inhdr_error; | |
244 | ||
245 | if (pskb_trim_rcsum(skb, len)) { | |
246 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
247 | goto drop; | |
248 | } | |
249 | ||
250 | /* Zero out the CB buffer if no options present */ | |
251 | if (iph->ihl == 5) { | |
252 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
257 | if (ip_options_compile(dev_net(dev), opt, skb)) | |
258 | goto inhdr_error; | |
259 | ||
260 | /* Check correct handling of SRR option */ | |
261 | if (unlikely(opt->srr)) { | |
262 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
263 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) | |
264 | goto drop; | |
265 | ||
266 | if (ip_options_rcv_srr(skb)) | |
267 | goto drop; | |
268 | } | |
269 | ||
270 | return 0; | |
271 | ||
272 | inhdr_error: | |
273 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
274 | drop: | |
275 | return -1; | |
276 | } | |
277 | ||
e179e632 BDS |
278 | /* Fill in the header for fragmented IP packets handled by |
279 | * the IPv4 connection tracking code. | |
07317621 SH |
280 | */ |
281 | int nf_bridge_copy_header(struct sk_buff *skb) | |
282 | { | |
283 | int err; | |
e179e632 | 284 | unsigned int header_size; |
07317621 | 285 | |
e179e632 BDS |
286 | nf_bridge_update_protocol(skb); |
287 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 288 | err = skb_cow_head(skb, header_size); |
07317621 SH |
289 | if (err) |
290 | return err; | |
291 | ||
27d7ff46 ACM |
292 | skb_copy_to_linear_data_offset(skb, -header_size, |
293 | skb->nf_bridge->data, header_size); | |
fc38582d | 294 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
295 | return 0; |
296 | } | |
297 | ||
1da177e4 LT |
298 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
299 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
300 | * bridge PRE_ROUTING hook. */ | |
301 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
302 | { | |
303 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 304 | struct rtable *rt; |
1da177e4 | 305 | |
1da177e4 LT |
306 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
307 | skb->pkt_type = PACKET_OTHERHOST; | |
308 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
309 | } | |
310 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
311 | ||
511c3f92 ED |
312 | rt = bridge_parent_rtable(nf_bridge->physindev); |
313 | if (!rt) { | |
4adf0af6 SW |
314 | kfree_skb(skb); |
315 | return 0; | |
316 | } | |
f9181f4f | 317 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
318 | |
319 | skb->dev = nf_bridge->physindev; | |
e179e632 | 320 | nf_bridge_update_protocol(skb); |
fc38582d | 321 | nf_bridge_push_encap_header(skb); |
713aefa3 | 322 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
323 | br_handle_frame_finish, 1); |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
e179e632 BDS |
328 | /* Obtain the correct destination MAC address, while preserving the original |
329 | * source MAC address. If we already know this address, we just copy it. If we | |
330 | * don't, we use the neighbour framework to find out. In both cases, we make | |
331 | * sure that br_handle_frame_finish() is called afterwards. | |
332 | */ | |
333 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
334 | { | |
335 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
336 | struct dst_entry *dst; | |
337 | ||
338 | skb->dev = bridge_parent(skb->dev); | |
339 | if (!skb->dev) | |
340 | goto free_skb; | |
341 | dst = skb_dst(skb); | |
342 | if (dst->hh) { | |
343 | neigh_hh_bridge(dst->hh, skb); | |
344 | skb->dev = nf_bridge->physindev; | |
345 | return br_handle_frame_finish(skb); | |
346 | } else if (dst->neighbour) { | |
347 | /* the neighbour function below overwrites the complete | |
348 | * MAC header, so we save the Ethernet source address and | |
349 | * protocol number. */ | |
350 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
351 | /* tell br_dev_xmit to continue with forwarding */ | |
352 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
353 | return dst->neighbour->output(skb); | |
354 | } | |
355 | free_skb: | |
356 | kfree_skb(skb); | |
357 | return 0; | |
358 | } | |
359 | ||
1da177e4 | 360 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 361 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
362 | * |
363 | * There are two cases to consider: | |
364 | * 1. The packet was DNAT'ed to a device in the same bridge | |
365 | * port group as it was received on. We can still bridge | |
366 | * the packet. | |
367 | * 2. The packet was DNAT'ed to a different device, either | |
368 | * a non-bridged device or another bridge port group. | |
369 | * The packet will need to be routed. | |
370 | * | |
371 | * The correct way of distinguishing between these two cases is to | |
372 | * call ip_route_input() and to look at skb->dst->dev, which is | |
373 | * changed to the destination device if ip_route_input() succeeds. | |
374 | * | |
ea2d9b41 | 375 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 376 | * |
ea2d9b41 BDS |
377 | * If the output device equals the logical bridge device the packet |
378 | * came in on, we can consider this bridging. The corresponding MAC | |
379 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
380 | * Otherwise, the packet is considered to be routed and we just |
381 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
382 | * later be passed up to the IP stack to be routed. For a redirected |
383 | * packet, ip_route_input() will give back the localhost as output device, | |
384 | * which differs from the bridge device. | |
1da177e4 | 385 | * |
ea2d9b41 | 386 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 387 | * |
f216f082 BDS |
388 | * This can be because the destination address is martian, in which case |
389 | * the packet will be dropped. | |
ea2d9b41 BDS |
390 | * If IP forwarding is disabled, ip_route_input() will fail, while |
391 | * ip_route_output_key() can return success. The source | |
392 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 393 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
394 | * if IP forwarding is enabled. If the output device equals the logical bridge |
395 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
396 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
397 | */ | |
1da177e4 LT |
398 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
399 | { | |
400 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 401 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 402 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 403 | struct rtable *rt; |
f216f082 | 404 | int err; |
1da177e4 | 405 | |
1da177e4 LT |
406 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
407 | skb->pkt_type = PACKET_OTHERHOST; | |
408 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
409 | } | |
410 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 411 | if (dnat_took_place(skb)) { |
f216f082 | 412 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
789bc3e5 SH |
413 | struct flowi fl = { |
414 | .nl_u = { | |
415 | .ip4_u = { | |
416 | .daddr = iph->daddr, | |
417 | .saddr = 0, | |
418 | .tos = RT_TOS(iph->tos) }, | |
419 | }, | |
420 | .proto = 0, | |
421 | }; | |
f3abc9b9 | 422 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
423 | |
424 | /* If err equals -EHOSTUNREACH the error is due to a | |
425 | * martian destination or due to the fact that | |
426 | * forwarding is disabled. For most martian packets, | |
427 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
428 | * martian destinations: loopback destinations and destination | |
429 | * 0.0.0.0. In both cases the packet will be dropped because the | |
430 | * destination is the loopback device and not the bridge. */ | |
431 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
432 | goto free_skb; | |
1da177e4 | 433 | |
249b6203 | 434 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
1c011bed | 435 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
436 | * require ip_forwarding. */ |
437 | if (((struct dst_entry *)rt)->dev == dev) { | |
adf30907 | 438 | skb_dst_set(skb, (struct dst_entry *)rt); |
1da177e4 LT |
439 | goto bridged_dnat; |
440 | } | |
1da177e4 LT |
441 | dst_release((struct dst_entry *)rt); |
442 | } | |
f216f082 | 443 | free_skb: |
1da177e4 LT |
444 | kfree_skb(skb); |
445 | return 0; | |
446 | } else { | |
adf30907 | 447 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 448 | bridged_dnat: |
1da177e4 | 449 | skb->dev = nf_bridge->physindev; |
e179e632 | 450 | nf_bridge_update_protocol(skb); |
fc38582d | 451 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
452 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
453 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
454 | skb, skb->dev, NULL, |
455 | br_nf_pre_routing_finish_bridge, | |
456 | 1); | |
457 | return 0; | |
458 | } | |
789bc3e5 | 459 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
460 | skb->pkt_type = PACKET_HOST; |
461 | } | |
462 | } else { | |
511c3f92 ED |
463 | rt = bridge_parent_rtable(nf_bridge->physindev); |
464 | if (!rt) { | |
4adf0af6 SW |
465 | kfree_skb(skb); |
466 | return 0; | |
467 | } | |
f9181f4f | 468 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
469 | } |
470 | ||
471 | skb->dev = nf_bridge->physindev; | |
e179e632 | 472 | nf_bridge_update_protocol(skb); |
fc38582d | 473 | nf_bridge_push_encap_header(skb); |
713aefa3 | 474 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
475 | br_handle_frame_finish, 1); |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
480 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 481 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
482 | { |
483 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
484 | ||
485 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
486 | skb->pkt_type = PACKET_HOST; | |
487 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
488 | } | |
489 | ||
490 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
491 | nf_bridge->physindev = skb->dev; | |
492 | skb->dev = bridge_parent(skb->dev); | |
e179e632 BDS |
493 | if (skb->protocol == htons(ETH_P_8021Q)) |
494 | nf_bridge->mask |= BRNF_8021Q; | |
495 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
496 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
497 | |
498 | return skb->dev; | |
1da177e4 LT |
499 | } |
500 | ||
501 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
502 | static int check_hbh_len(struct sk_buff *skb) | |
503 | { | |
0660e03f | 504 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 505 | u32 pkt_len; |
d56f90a7 ACM |
506 | const unsigned char *nh = skb_network_header(skb); |
507 | int off = raw - nh; | |
789bc3e5 | 508 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
509 | |
510 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
511 | goto bad; | |
512 | ||
513 | off += 2; | |
514 | len -= 2; | |
515 | ||
516 | while (len > 0) { | |
d56f90a7 | 517 | int optlen = nh[off + 1] + 2; |
1da177e4 | 518 | |
d56f90a7 | 519 | switch (nh[off]) { |
1da177e4 LT |
520 | case IPV6_TLV_PAD0: |
521 | optlen = 1; | |
522 | break; | |
523 | ||
524 | case IPV6_TLV_PADN: | |
525 | break; | |
526 | ||
527 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 528 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 529 | goto bad; |
d56f90a7 | 530 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 531 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 532 | ipv6_hdr(skb)->payload_len) |
b0366486 | 533 | goto bad; |
1da177e4 LT |
534 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
535 | goto bad; | |
b0366486 | 536 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 537 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 538 | goto bad; |
d56f90a7 | 539 | nh = skb_network_header(skb); |
1da177e4 LT |
540 | break; |
541 | default: | |
542 | if (optlen > len) | |
543 | goto bad; | |
544 | break; | |
545 | } | |
546 | off += optlen; | |
547 | len -= optlen; | |
548 | } | |
549 | if (len == 0) | |
550 | return 0; | |
551 | bad: | |
552 | return -1; | |
553 | ||
554 | } | |
555 | ||
556 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
557 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
558 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
559 | struct sk_buff *skb, |
560 | const struct net_device *in, | |
561 | const struct net_device *out, | |
562 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
563 | { |
564 | struct ipv6hdr *hdr; | |
565 | u32 pkt_len; | |
1da177e4 LT |
566 | |
567 | if (skb->len < sizeof(struct ipv6hdr)) | |
568 | goto inhdr_error; | |
569 | ||
570 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
571 | goto inhdr_error; | |
572 | ||
0660e03f | 573 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
574 | |
575 | if (hdr->version != 6) | |
576 | goto inhdr_error; | |
577 | ||
578 | pkt_len = ntohs(hdr->payload_len); | |
579 | ||
580 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
581 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
582 | goto inhdr_error; | |
b38dfee3 HX |
583 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
584 | goto inhdr_error; | |
1da177e4 LT |
585 | } |
586 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 587 | goto inhdr_error; |
1da177e4 | 588 | |
789bc3e5 | 589 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 590 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 591 | return NF_DROP; |
5dce971a SH |
592 | if (!setup_pre_routing(skb)) |
593 | return NF_DROP; | |
1da177e4 | 594 | |
e179e632 | 595 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 596 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
597 | br_nf_pre_routing_finish_ipv6); |
598 | ||
599 | return NF_STOLEN; | |
600 | ||
601 | inhdr_error: | |
602 | return NF_DROP; | |
603 | } | |
604 | ||
605 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
606 | * Replicate the checks that IPv4 does on packet reception. | |
607 | * Set skb->dev to the bridge device (i.e. parent of the | |
608 | * receiving device) to make netfilter happy, the REDIRECT | |
609 | * target in particular. Save the original destination IP | |
610 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 611 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
612 | const struct net_device *in, |
613 | const struct net_device *out, | |
614 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 615 | { |
4df53d8b PM |
616 | struct net_bridge_port *p; |
617 | struct net_bridge *br; | |
e7c243c9 EP |
618 | __u32 len = nf_bridge_encap_header_len(skb); |
619 | ||
e7c243c9 EP |
620 | if (unlikely(!pskb_may_pull(skb, len))) |
621 | goto out; | |
1da177e4 | 622 | |
e490c1de | 623 | p = br_port_get_rcu(in); |
4df53d8b PM |
624 | if (p == NULL) |
625 | goto out; | |
626 | br = p->br; | |
627 | ||
516299d2 MM |
628 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
629 | IS_PPPOE_IPV6(skb)) { | |
4df53d8b | 630 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 631 | return NF_ACCEPT; |
4df53d8b | 632 | |
fc38582d | 633 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
634 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
635 | } | |
4df53d8b PM |
636 | |
637 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 638 | return NF_ACCEPT; |
1da177e4 | 639 | |
516299d2 MM |
640 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
641 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
642 | return NF_ACCEPT; |
643 | ||
fc38582d | 644 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 645 | |
462fb2af BD |
646 | if (br_parse_ip_options(skb)) |
647 | /* Drop invalid packet */ | |
648 | goto out; | |
17762060 | 649 | |
789bc3e5 | 650 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 651 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 652 | return NF_DROP; |
5dce971a SH |
653 | if (!setup_pre_routing(skb)) |
654 | return NF_DROP; | |
1da177e4 | 655 | store_orig_dstaddr(skb); |
e179e632 | 656 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 657 | |
713aefa3 | 658 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
659 | br_nf_pre_routing_finish); |
660 | ||
661 | return NF_STOLEN; | |
662 | ||
1da177e4 LT |
663 | out: |
664 | return NF_DROP; | |
665 | } | |
666 | ||
667 | ||
668 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
669 | /* The packet is locally destined, which requires a real | |
670 | * dst_entry, so detach the fake one. On the way up, the | |
671 | * packet would pass through PRE_ROUTING again (which already | |
672 | * took place when the packet entered the bridge), but we | |
673 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
674 | * prevent this from happening. */ | |
3db05fea | 675 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
676 | const struct net_device *in, |
677 | const struct net_device *out, | |
678 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 679 | { |
511c3f92 ED |
680 | struct rtable *rt = skb_rtable(skb); |
681 | ||
adf30907 ED |
682 | if (rt && rt == bridge_parent_rtable(in)) |
683 | skb_dst_drop(skb); | |
1da177e4 LT |
684 | |
685 | return NF_ACCEPT; | |
686 | } | |
687 | ||
1da177e4 LT |
688 | /* PF_BRIDGE/FORWARD *************************************************/ |
689 | static int br_nf_forward_finish(struct sk_buff *skb) | |
690 | { | |
691 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
692 | struct net_device *in; | |
1da177e4 | 693 | |
8b42ec39 | 694 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
695 | in = nf_bridge->physindev; |
696 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
697 | skb->pkt_type = PACKET_OTHERHOST; | |
698 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
699 | } | |
e94c6743 | 700 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
701 | } else { |
702 | in = *((struct net_device **)(skb->cb)); | |
703 | } | |
fc38582d | 704 | nf_bridge_push_encap_header(skb); |
e179e632 | 705 | |
713aefa3 | 706 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 707 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
708 | return 0; |
709 | } | |
710 | ||
711 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
712 | * netfilter with indev and outdev set to the bridge device, | |
713 | * but we are still able to filter on the 'real' indev/outdev | |
714 | * because of the physdev module. For ARP, indev and outdev are the | |
715 | * bridge ports. */ | |
3db05fea | 716 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
717 | const struct net_device *in, |
718 | const struct net_device *out, | |
719 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 720 | { |
1da177e4 | 721 | struct nf_bridge_info *nf_bridge; |
5dce971a | 722 | struct net_device *parent; |
76108cea | 723 | u_int8_t pf; |
1da177e4 LT |
724 | |
725 | if (!skb->nf_bridge) | |
726 | return NF_ACCEPT; | |
727 | ||
2dc2f207 PM |
728 | /* Need exclusive nf_bridge_info since we might have multiple |
729 | * different physoutdevs. */ | |
730 | if (!nf_bridge_unshare(skb)) | |
731 | return NF_DROP; | |
732 | ||
5dce971a SH |
733 | parent = bridge_parent(out); |
734 | if (!parent) | |
735 | return NF_DROP; | |
736 | ||
516299d2 MM |
737 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
738 | IS_PPPOE_IP(skb)) | |
1da177e4 | 739 | pf = PF_INET; |
a2bd40ad HX |
740 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
741 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 742 | pf = PF_INET6; |
a2bd40ad HX |
743 | else |
744 | return NF_ACCEPT; | |
1da177e4 | 745 | |
3db05fea | 746 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 747 | |
1da177e4 LT |
748 | nf_bridge = skb->nf_bridge; |
749 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
750 | skb->pkt_type = PACKET_HOST; | |
751 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
752 | } | |
753 | ||
754 | /* The physdev module checks on this */ | |
755 | nf_bridge->mask |= BRNF_BRIDGED; | |
756 | nf_bridge->physoutdev = skb->dev; | |
e179e632 BDS |
757 | if (pf == PF_INET) |
758 | skb->protocol = htons(ETH_P_IP); | |
759 | else | |
760 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 761 | |
6e23ae2a | 762 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 763 | br_nf_forward_finish); |
1da177e4 LT |
764 | |
765 | return NF_STOLEN; | |
766 | } | |
767 | ||
3db05fea | 768 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
769 | const struct net_device *in, |
770 | const struct net_device *out, | |
771 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 772 | { |
4df53d8b PM |
773 | struct net_bridge_port *p; |
774 | struct net_bridge *br; | |
1da177e4 LT |
775 | struct net_device **d = (struct net_device **)(skb->cb); |
776 | ||
e490c1de | 777 | p = br_port_get_rcu(out); |
4df53d8b PM |
778 | if (p == NULL) |
779 | return NF_ACCEPT; | |
780 | br = p->br; | |
781 | ||
782 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 783 | return NF_ACCEPT; |
1da177e4 | 784 | |
f8a26028 | 785 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 786 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 787 | return NF_ACCEPT; |
3db05fea | 788 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
789 | } |
790 | ||
d0a92be0 | 791 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 792 | if (IS_VLAN_ARP(skb)) |
3db05fea | 793 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
794 | return NF_ACCEPT; |
795 | } | |
796 | *d = (struct net_device *)in; | |
fdc9314c | 797 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
798 | (struct net_device *)out, br_nf_forward_finish); |
799 | ||
800 | return NF_STOLEN; | |
801 | } | |
802 | ||
c197facc | 803 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
2e2f7aef PM |
804 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
805 | { | |
462fb2af BD |
806 | int ret; |
807 | ||
e179e632 | 808 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 809 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 810 | !skb_is_gso(skb)) { |
462fb2af BD |
811 | if (br_parse_ip_options(skb)) |
812 | /* Drop invalid packet */ | |
813 | return NF_DROP; | |
814 | ret = ip_fragment(skb, br_dev_queue_push_xmit); | |
87f94b4e | 815 | } else |
462fb2af BD |
816 | ret = br_dev_queue_push_xmit(skb); |
817 | ||
818 | return ret; | |
2e2f7aef | 819 | } |
c197facc | 820 | #else |
821 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
822 | { | |
823 | return br_dev_queue_push_xmit(skb); | |
824 | } | |
825 | #endif | |
1da177e4 LT |
826 | |
827 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 828 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
829 | const struct net_device *in, |
830 | const struct net_device *out, | |
831 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 832 | { |
3db05fea | 833 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 834 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 835 | u_int8_t pf; |
1da177e4 | 836 | |
ea2d9b41 | 837 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
838 | return NF_ACCEPT; |
839 | ||
5dce971a SH |
840 | if (!realoutdev) |
841 | return NF_DROP; | |
842 | ||
516299d2 MM |
843 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
844 | IS_PPPOE_IP(skb)) | |
1da177e4 | 845 | pf = PF_INET; |
a2bd40ad HX |
846 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
847 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 848 | pf = PF_INET6; |
a2bd40ad HX |
849 | else |
850 | return NF_ACCEPT; | |
1da177e4 | 851 | |
1da177e4 LT |
852 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
853 | * about the value of skb->pkt_type. */ | |
854 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
855 | skb->pkt_type = PACKET_HOST; | |
856 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
857 | } | |
858 | ||
fc38582d | 859 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 860 | nf_bridge_save_header(skb); |
e179e632 BDS |
861 | if (pf == PF_INET) |
862 | skb->protocol = htons(ETH_P_IP); | |
863 | else | |
864 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 865 | |
6e23ae2a | 866 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 867 | br_nf_dev_queue_xmit); |
1da177e4 LT |
868 | |
869 | return NF_STOLEN; | |
1da177e4 LT |
870 | } |
871 | ||
1da177e4 LT |
872 | /* IP/SABOTAGE *****************************************************/ |
873 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
874 | * for the second time. */ | |
3db05fea | 875 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
876 | const struct net_device *in, |
877 | const struct net_device *out, | |
878 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 879 | { |
3db05fea HX |
880 | if (skb->nf_bridge && |
881 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
882 | return NF_STOP; |
883 | } | |
884 | ||
885 | return NF_ACCEPT; | |
886 | } | |
887 | ||
ea2d9b41 BDS |
888 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
889 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 890 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
891 | { |
892 | .hook = br_nf_pre_routing, | |
893 | .owner = THIS_MODULE, | |
894 | .pf = PF_BRIDGE, | |
895 | .hooknum = NF_BR_PRE_ROUTING, | |
896 | .priority = NF_BR_PRI_BRNF, | |
897 | }, | |
898 | { | |
899 | .hook = br_nf_local_in, | |
900 | .owner = THIS_MODULE, | |
901 | .pf = PF_BRIDGE, | |
902 | .hooknum = NF_BR_LOCAL_IN, | |
903 | .priority = NF_BR_PRI_BRNF, | |
904 | }, | |
905 | { | |
906 | .hook = br_nf_forward_ip, | |
907 | .owner = THIS_MODULE, | |
908 | .pf = PF_BRIDGE, | |
909 | .hooknum = NF_BR_FORWARD, | |
910 | .priority = NF_BR_PRI_BRNF - 1, | |
911 | }, | |
912 | { | |
913 | .hook = br_nf_forward_arp, | |
914 | .owner = THIS_MODULE, | |
915 | .pf = PF_BRIDGE, | |
916 | .hooknum = NF_BR_FORWARD, | |
917 | .priority = NF_BR_PRI_BRNF, | |
918 | }, | |
1490fd89 CG |
919 | { |
920 | .hook = br_nf_post_routing, | |
921 | .owner = THIS_MODULE, | |
922 | .pf = PF_BRIDGE, | |
923 | .hooknum = NF_BR_POST_ROUTING, | |
924 | .priority = NF_BR_PRI_LAST, | |
925 | }, | |
926 | { | |
927 | .hook = ip_sabotage_in, | |
928 | .owner = THIS_MODULE, | |
929 | .pf = PF_INET, | |
930 | .hooknum = NF_INET_PRE_ROUTING, | |
931 | .priority = NF_IP_PRI_FIRST, | |
932 | }, | |
933 | { | |
934 | .hook = ip_sabotage_in, | |
935 | .owner = THIS_MODULE, | |
936 | .pf = PF_INET6, | |
937 | .hooknum = NF_INET_PRE_ROUTING, | |
938 | .priority = NF_IP6_PRI_FIRST, | |
939 | }, | |
1da177e4 LT |
940 | }; |
941 | ||
942 | #ifdef CONFIG_SYSCTL | |
943 | static | |
8d65af78 | 944 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 945 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
946 | { |
947 | int ret; | |
948 | ||
8d65af78 | 949 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
950 | |
951 | if (write && *(int *)(ctl->data)) | |
952 | *(int *)(ctl->data) = 1; | |
953 | return ret; | |
954 | } | |
955 | ||
956 | static ctl_table brnf_table[] = { | |
957 | { | |
1da177e4 LT |
958 | .procname = "bridge-nf-call-arptables", |
959 | .data = &brnf_call_arptables, | |
960 | .maxlen = sizeof(int), | |
961 | .mode = 0644, | |
6d9f239a | 962 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
963 | }, |
964 | { | |
1da177e4 LT |
965 | .procname = "bridge-nf-call-iptables", |
966 | .data = &brnf_call_iptables, | |
967 | .maxlen = sizeof(int), | |
968 | .mode = 0644, | |
6d9f239a | 969 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
970 | }, |
971 | { | |
1da177e4 LT |
972 | .procname = "bridge-nf-call-ip6tables", |
973 | .data = &brnf_call_ip6tables, | |
974 | .maxlen = sizeof(int), | |
975 | .mode = 0644, | |
6d9f239a | 976 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
977 | }, |
978 | { | |
1da177e4 LT |
979 | .procname = "bridge-nf-filter-vlan-tagged", |
980 | .data = &brnf_filter_vlan_tagged, | |
981 | .maxlen = sizeof(int), | |
982 | .mode = 0644, | |
6d9f239a | 983 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
984 | }, |
985 | { | |
516299d2 MM |
986 | .procname = "bridge-nf-filter-pppoe-tagged", |
987 | .data = &brnf_filter_pppoe_tagged, | |
988 | .maxlen = sizeof(int), | |
989 | .mode = 0644, | |
6d9f239a | 990 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 991 | }, |
f8572d8f | 992 | { } |
1da177e4 LT |
993 | }; |
994 | ||
b5ccd792 | 995 | static struct ctl_path brnf_path[] = { |
f8572d8f EB |
996 | { .procname = "net", }, |
997 | { .procname = "bridge", }, | |
b5ccd792 | 998 | { } |
1da177e4 LT |
999 | }; |
1000 | #endif | |
1001 | ||
5eb87f45 | 1002 | int __init br_netfilter_init(void) |
1da177e4 | 1003 | { |
5eb87f45 | 1004 | int ret; |
1da177e4 | 1005 | |
5eb87f45 PM |
1006 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1007 | if (ret < 0) | |
1da177e4 | 1008 | return ret; |
1da177e4 | 1009 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 1010 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 1011 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1012 | printk(KERN_WARNING |
1013 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 PM |
1014 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1015 | return -ENOMEM; | |
1da177e4 LT |
1016 | } |
1017 | #endif | |
1da177e4 | 1018 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1019 | return 0; |
1020 | } | |
1021 | ||
1022 | void br_netfilter_fini(void) | |
1023 | { | |
5eb87f45 | 1024 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
1025 | #ifdef CONFIG_SYSCTL |
1026 | unregister_sysctl_table(brnf_sysctl_header); | |
1027 | #endif | |
1028 | } |