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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 | }; |
110 | ||
4adf0af6 SW |
111 | /* |
112 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
113 | * Currently, we fill in the PMTU entry because netfilter |
114 | * refragmentation needs it, and the rt_flags entry because | |
115 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
116 | * require us to fill additional fields. |
117 | */ | |
118 | void br_netfilter_rtable_init(struct net_bridge *br) | |
119 | { | |
120 | struct rtable *rt = &br->fake_rtable; | |
121 | ||
d8d1f30b CG |
122 | atomic_set(&rt->dst.__refcnt, 1); |
123 | rt->dst.dev = br->dev; | |
124 | rt->dst.path = &rt->dst; | |
125 | rt->dst.metrics[RTAX_MTU - 1] = 1500; | |
126 | rt->dst.flags = DST_NOXFRM; | |
127 | rt->dst.ops = &fake_dst_ops; | |
4adf0af6 SW |
128 | } |
129 | ||
130 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
131 | { | |
f350a0a8 JP |
132 | if (!br_port_exists(dev)) |
133 | return NULL; | |
134 | return &br_port_get_rcu(dev)->br->fake_rtable; | |
4adf0af6 | 135 | } |
1da177e4 | 136 | |
5dce971a SH |
137 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
138 | { | |
f350a0a8 JP |
139 | if (!br_port_exists(dev)) |
140 | return NULL; | |
5dce971a | 141 | |
f350a0a8 | 142 | return br_port_get_rcu(dev)->br->dev; |
5dce971a | 143 | } |
1da177e4 | 144 | |
fdeabdef SH |
145 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
146 | { | |
147 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
148 | if (likely(skb->nf_bridge)) | |
149 | atomic_set(&(skb->nf_bridge->use), 1); | |
150 | ||
151 | return skb->nf_bridge; | |
152 | } | |
153 | ||
2dc2f207 PM |
154 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
155 | { | |
156 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
157 | ||
158 | if (atomic_read(&nf_bridge->use) > 1) { | |
159 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
160 | ||
161 | if (tmp) { | |
162 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
163 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 164 | } |
4c3a76ab | 165 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
166 | nf_bridge = tmp; |
167 | } | |
168 | return nf_bridge; | |
169 | } | |
170 | ||
fc38582d PM |
171 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
172 | { | |
173 | unsigned int len = nf_bridge_encap_header_len(skb); | |
174 | ||
175 | skb_push(skb, len); | |
176 | skb->network_header -= len; | |
177 | } | |
178 | ||
179 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 180 | { |
fc38582d PM |
181 | unsigned int len = nf_bridge_encap_header_len(skb); |
182 | ||
183 | skb_pull(skb, len); | |
184 | skb->network_header += len; | |
185 | } | |
fdeabdef | 186 | |
fc38582d PM |
187 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
188 | { | |
189 | unsigned int len = nf_bridge_encap_header_len(skb); | |
190 | ||
191 | skb_pull_rcsum(skb, len); | |
192 | skb->network_header += len; | |
193 | } | |
194 | ||
195 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
196 | { | |
197 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 198 | |
d626f62b ACM |
199 | skb_copy_from_linear_data_offset(skb, -header_size, |
200 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
201 | } |
202 | ||
e179e632 BDS |
203 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
204 | { | |
205 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
206 | skb->protocol = htons(ETH_P_8021Q); | |
207 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
208 | skb->protocol = htons(ETH_P_PPP_SES); | |
209 | } | |
210 | ||
462fb2af BD |
211 | /* When handing a packet over to the IP layer |
212 | * check whether we have a skb that is in the | |
213 | * expected format | |
214 | */ | |
215 | ||
216 | int br_parse_ip_options(struct sk_buff *skb) | |
217 | { | |
218 | struct ip_options *opt; | |
219 | struct iphdr *iph; | |
220 | struct net_device *dev = skb->dev; | |
221 | u32 len; | |
222 | ||
223 | iph = ip_hdr(skb); | |
224 | opt = &(IPCB(skb)->opt); | |
225 | ||
226 | /* Basic sanity checks */ | |
227 | if (iph->ihl < 5 || iph->version != 4) | |
228 | goto inhdr_error; | |
229 | ||
230 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
231 | goto inhdr_error; | |
232 | ||
233 | iph = ip_hdr(skb); | |
234 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
235 | goto inhdr_error; | |
236 | ||
237 | len = ntohs(iph->tot_len); | |
238 | if (skb->len < len) { | |
239 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
240 | goto drop; | |
241 | } else if (len < (iph->ihl*4)) | |
242 | goto inhdr_error; | |
243 | ||
244 | if (pskb_trim_rcsum(skb, len)) { | |
245 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
246 | goto drop; | |
247 | } | |
248 | ||
249 | /* Zero out the CB buffer if no options present */ | |
250 | if (iph->ihl == 5) { | |
251 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
256 | if (ip_options_compile(dev_net(dev), opt, skb)) | |
257 | goto inhdr_error; | |
258 | ||
259 | /* Check correct handling of SRR option */ | |
260 | if (unlikely(opt->srr)) { | |
261 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
262 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) | |
263 | goto drop; | |
264 | ||
265 | if (ip_options_rcv_srr(skb)) | |
266 | goto drop; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | ||
271 | inhdr_error: | |
272 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
273 | drop: | |
274 | return -1; | |
275 | } | |
276 | ||
e179e632 BDS |
277 | /* Fill in the header for fragmented IP packets handled by |
278 | * the IPv4 connection tracking code. | |
07317621 SH |
279 | */ |
280 | int nf_bridge_copy_header(struct sk_buff *skb) | |
281 | { | |
282 | int err; | |
e179e632 | 283 | unsigned int header_size; |
07317621 | 284 | |
e179e632 BDS |
285 | nf_bridge_update_protocol(skb); |
286 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 287 | err = skb_cow_head(skb, header_size); |
07317621 SH |
288 | if (err) |
289 | return err; | |
290 | ||
27d7ff46 ACM |
291 | skb_copy_to_linear_data_offset(skb, -header_size, |
292 | skb->nf_bridge->data, header_size); | |
fc38582d | 293 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
294 | return 0; |
295 | } | |
296 | ||
1da177e4 LT |
297 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
298 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
299 | * bridge PRE_ROUTING hook. */ | |
300 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
301 | { | |
302 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 303 | struct rtable *rt; |
1da177e4 | 304 | |
1da177e4 LT |
305 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
306 | skb->pkt_type = PACKET_OTHERHOST; | |
307 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
308 | } | |
309 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
310 | ||
511c3f92 ED |
311 | rt = bridge_parent_rtable(nf_bridge->physindev); |
312 | if (!rt) { | |
4adf0af6 SW |
313 | kfree_skb(skb); |
314 | return 0; | |
315 | } | |
f9181f4f | 316 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
317 | |
318 | skb->dev = nf_bridge->physindev; | |
e179e632 | 319 | nf_bridge_update_protocol(skb); |
fc38582d | 320 | nf_bridge_push_encap_header(skb); |
713aefa3 | 321 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
322 | br_handle_frame_finish, 1); |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
e179e632 BDS |
327 | /* Obtain the correct destination MAC address, while preserving the original |
328 | * source MAC address. If we already know this address, we just copy it. If we | |
329 | * don't, we use the neighbour framework to find out. In both cases, we make | |
330 | * sure that br_handle_frame_finish() is called afterwards. | |
331 | */ | |
332 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
333 | { | |
334 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
335 | struct dst_entry *dst; | |
336 | ||
337 | skb->dev = bridge_parent(skb->dev); | |
338 | if (!skb->dev) | |
339 | goto free_skb; | |
340 | dst = skb_dst(skb); | |
341 | if (dst->hh) { | |
342 | neigh_hh_bridge(dst->hh, skb); | |
343 | skb->dev = nf_bridge->physindev; | |
344 | return br_handle_frame_finish(skb); | |
345 | } else if (dst->neighbour) { | |
346 | /* the neighbour function below overwrites the complete | |
347 | * MAC header, so we save the Ethernet source address and | |
348 | * protocol number. */ | |
349 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
350 | /* tell br_dev_xmit to continue with forwarding */ | |
351 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
352 | return dst->neighbour->output(skb); | |
353 | } | |
354 | free_skb: | |
355 | kfree_skb(skb); | |
356 | return 0; | |
357 | } | |
358 | ||
1da177e4 | 359 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 360 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
361 | * |
362 | * There are two cases to consider: | |
363 | * 1. The packet was DNAT'ed to a device in the same bridge | |
364 | * port group as it was received on. We can still bridge | |
365 | * the packet. | |
366 | * 2. The packet was DNAT'ed to a different device, either | |
367 | * a non-bridged device or another bridge port group. | |
368 | * The packet will need to be routed. | |
369 | * | |
370 | * The correct way of distinguishing between these two cases is to | |
371 | * call ip_route_input() and to look at skb->dst->dev, which is | |
372 | * changed to the destination device if ip_route_input() succeeds. | |
373 | * | |
ea2d9b41 | 374 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 375 | * |
ea2d9b41 BDS |
376 | * If the output device equals the logical bridge device the packet |
377 | * came in on, we can consider this bridging. The corresponding MAC | |
378 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
379 | * Otherwise, the packet is considered to be routed and we just |
380 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
381 | * later be passed up to the IP stack to be routed. For a redirected |
382 | * packet, ip_route_input() will give back the localhost as output device, | |
383 | * which differs from the bridge device. | |
1da177e4 | 384 | * |
ea2d9b41 | 385 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 386 | * |
f216f082 BDS |
387 | * This can be because the destination address is martian, in which case |
388 | * the packet will be dropped. | |
ea2d9b41 BDS |
389 | * If IP forwarding is disabled, ip_route_input() will fail, while |
390 | * ip_route_output_key() can return success. The source | |
391 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 392 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
393 | * if IP forwarding is enabled. If the output device equals the logical bridge |
394 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
395 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
396 | */ | |
1da177e4 LT |
397 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
398 | { | |
399 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 400 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 401 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 402 | struct rtable *rt; |
f216f082 | 403 | int err; |
1da177e4 | 404 | |
1da177e4 LT |
405 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
406 | skb->pkt_type = PACKET_OTHERHOST; | |
407 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
408 | } | |
409 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 410 | if (dnat_took_place(skb)) { |
f216f082 | 411 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
789bc3e5 SH |
412 | struct flowi fl = { |
413 | .nl_u = { | |
414 | .ip4_u = { | |
415 | .daddr = iph->daddr, | |
416 | .saddr = 0, | |
417 | .tos = RT_TOS(iph->tos) }, | |
418 | }, | |
419 | .proto = 0, | |
420 | }; | |
f3abc9b9 | 421 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
422 | |
423 | /* If err equals -EHOSTUNREACH the error is due to a | |
424 | * martian destination or due to the fact that | |
425 | * forwarding is disabled. For most martian packets, | |
426 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
427 | * martian destinations: loopback destinations and destination | |
428 | * 0.0.0.0. In both cases the packet will be dropped because the | |
429 | * destination is the loopback device and not the bridge. */ | |
430 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
431 | goto free_skb; | |
1da177e4 | 432 | |
249b6203 | 433 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
1c011bed | 434 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
435 | * require ip_forwarding. */ |
436 | if (((struct dst_entry *)rt)->dev == dev) { | |
adf30907 | 437 | skb_dst_set(skb, (struct dst_entry *)rt); |
1da177e4 LT |
438 | goto bridged_dnat; |
439 | } | |
1da177e4 LT |
440 | dst_release((struct dst_entry *)rt); |
441 | } | |
f216f082 | 442 | free_skb: |
1da177e4 LT |
443 | kfree_skb(skb); |
444 | return 0; | |
445 | } else { | |
adf30907 | 446 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 447 | bridged_dnat: |
1da177e4 | 448 | skb->dev = nf_bridge->physindev; |
e179e632 | 449 | nf_bridge_update_protocol(skb); |
fc38582d | 450 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
451 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
452 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
453 | skb, skb->dev, NULL, |
454 | br_nf_pre_routing_finish_bridge, | |
455 | 1); | |
456 | return 0; | |
457 | } | |
789bc3e5 | 458 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
459 | skb->pkt_type = PACKET_HOST; |
460 | } | |
461 | } else { | |
511c3f92 ED |
462 | rt = bridge_parent_rtable(nf_bridge->physindev); |
463 | if (!rt) { | |
4adf0af6 SW |
464 | kfree_skb(skb); |
465 | return 0; | |
466 | } | |
f9181f4f | 467 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
468 | } |
469 | ||
470 | skb->dev = nf_bridge->physindev; | |
e179e632 | 471 | nf_bridge_update_protocol(skb); |
fc38582d | 472 | nf_bridge_push_encap_header(skb); |
713aefa3 | 473 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
474 | br_handle_frame_finish, 1); |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 480 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
481 | { |
482 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
483 | ||
484 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
485 | skb->pkt_type = PACKET_HOST; | |
486 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
487 | } | |
488 | ||
489 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
490 | nf_bridge->physindev = skb->dev; | |
491 | skb->dev = bridge_parent(skb->dev); | |
e179e632 BDS |
492 | if (skb->protocol == htons(ETH_P_8021Q)) |
493 | nf_bridge->mask |= BRNF_8021Q; | |
494 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
495 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
496 | |
497 | return skb->dev; | |
1da177e4 LT |
498 | } |
499 | ||
500 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
501 | static int check_hbh_len(struct sk_buff *skb) | |
502 | { | |
0660e03f | 503 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 504 | u32 pkt_len; |
d56f90a7 ACM |
505 | const unsigned char *nh = skb_network_header(skb); |
506 | int off = raw - nh; | |
789bc3e5 | 507 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
508 | |
509 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
510 | goto bad; | |
511 | ||
512 | off += 2; | |
513 | len -= 2; | |
514 | ||
515 | while (len > 0) { | |
d56f90a7 | 516 | int optlen = nh[off + 1] + 2; |
1da177e4 | 517 | |
d56f90a7 | 518 | switch (nh[off]) { |
1da177e4 LT |
519 | case IPV6_TLV_PAD0: |
520 | optlen = 1; | |
521 | break; | |
522 | ||
523 | case IPV6_TLV_PADN: | |
524 | break; | |
525 | ||
526 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 527 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 528 | goto bad; |
d56f90a7 | 529 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 530 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 531 | ipv6_hdr(skb)->payload_len) |
b0366486 | 532 | goto bad; |
1da177e4 LT |
533 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
534 | goto bad; | |
b0366486 | 535 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 536 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 537 | goto bad; |
d56f90a7 | 538 | nh = skb_network_header(skb); |
1da177e4 LT |
539 | break; |
540 | default: | |
541 | if (optlen > len) | |
542 | goto bad; | |
543 | break; | |
544 | } | |
545 | off += optlen; | |
546 | len -= optlen; | |
547 | } | |
548 | if (len == 0) | |
549 | return 0; | |
550 | bad: | |
551 | return -1; | |
552 | ||
553 | } | |
554 | ||
555 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
556 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
557 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
558 | struct sk_buff *skb, |
559 | const struct net_device *in, | |
560 | const struct net_device *out, | |
561 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
562 | { |
563 | struct ipv6hdr *hdr; | |
564 | u32 pkt_len; | |
1da177e4 LT |
565 | |
566 | if (skb->len < sizeof(struct ipv6hdr)) | |
567 | goto inhdr_error; | |
568 | ||
569 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
570 | goto inhdr_error; | |
571 | ||
0660e03f | 572 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
573 | |
574 | if (hdr->version != 6) | |
575 | goto inhdr_error; | |
576 | ||
577 | pkt_len = ntohs(hdr->payload_len); | |
578 | ||
579 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
580 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
581 | goto inhdr_error; | |
b38dfee3 HX |
582 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
583 | goto inhdr_error; | |
1da177e4 LT |
584 | } |
585 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 586 | goto inhdr_error; |
1da177e4 | 587 | |
789bc3e5 | 588 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 589 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 590 | return NF_DROP; |
5dce971a SH |
591 | if (!setup_pre_routing(skb)) |
592 | return NF_DROP; | |
1da177e4 | 593 | |
e179e632 | 594 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 595 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
596 | br_nf_pre_routing_finish_ipv6); |
597 | ||
598 | return NF_STOLEN; | |
599 | ||
600 | inhdr_error: | |
601 | return NF_DROP; | |
602 | } | |
603 | ||
604 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
605 | * Replicate the checks that IPv4 does on packet reception. | |
606 | * Set skb->dev to the bridge device (i.e. parent of the | |
607 | * receiving device) to make netfilter happy, the REDIRECT | |
608 | * target in particular. Save the original destination IP | |
609 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 610 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
611 | const struct net_device *in, |
612 | const struct net_device *out, | |
613 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 614 | { |
4df53d8b PM |
615 | struct net_bridge_port *p; |
616 | struct net_bridge *br; | |
e7c243c9 EP |
617 | __u32 len = nf_bridge_encap_header_len(skb); |
618 | ||
e7c243c9 EP |
619 | if (unlikely(!pskb_may_pull(skb, len))) |
620 | goto out; | |
1da177e4 | 621 | |
e490c1de | 622 | p = br_port_get_rcu(in); |
4df53d8b PM |
623 | if (p == NULL) |
624 | goto out; | |
625 | br = p->br; | |
626 | ||
516299d2 MM |
627 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
628 | IS_PPPOE_IPV6(skb)) { | |
4df53d8b | 629 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 630 | return NF_ACCEPT; |
4df53d8b | 631 | |
fc38582d | 632 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
633 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
634 | } | |
4df53d8b PM |
635 | |
636 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 637 | return NF_ACCEPT; |
1da177e4 | 638 | |
516299d2 MM |
639 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
640 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
641 | return NF_ACCEPT; |
642 | ||
fc38582d | 643 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 644 | |
462fb2af BD |
645 | if (br_parse_ip_options(skb)) |
646 | /* Drop invalid packet */ | |
647 | goto out; | |
17762060 | 648 | |
789bc3e5 | 649 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 650 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 651 | return NF_DROP; |
5dce971a SH |
652 | if (!setup_pre_routing(skb)) |
653 | return NF_DROP; | |
1da177e4 | 654 | store_orig_dstaddr(skb); |
e179e632 | 655 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 656 | |
713aefa3 | 657 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
658 | br_nf_pre_routing_finish); |
659 | ||
660 | return NF_STOLEN; | |
661 | ||
1da177e4 LT |
662 | out: |
663 | return NF_DROP; | |
664 | } | |
665 | ||
666 | ||
667 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
668 | /* The packet is locally destined, which requires a real | |
669 | * dst_entry, so detach the fake one. On the way up, the | |
670 | * packet would pass through PRE_ROUTING again (which already | |
671 | * took place when the packet entered the bridge), but we | |
672 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
673 | * prevent this from happening. */ | |
3db05fea | 674 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
675 | const struct net_device *in, |
676 | const struct net_device *out, | |
677 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 678 | { |
511c3f92 ED |
679 | struct rtable *rt = skb_rtable(skb); |
680 | ||
adf30907 ED |
681 | if (rt && rt == bridge_parent_rtable(in)) |
682 | skb_dst_drop(skb); | |
1da177e4 LT |
683 | |
684 | return NF_ACCEPT; | |
685 | } | |
686 | ||
1da177e4 LT |
687 | /* PF_BRIDGE/FORWARD *************************************************/ |
688 | static int br_nf_forward_finish(struct sk_buff *skb) | |
689 | { | |
690 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
691 | struct net_device *in; | |
1da177e4 | 692 | |
8b42ec39 | 693 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
694 | in = nf_bridge->physindev; |
695 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
696 | skb->pkt_type = PACKET_OTHERHOST; | |
697 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
698 | } | |
e94c6743 | 699 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
700 | } else { |
701 | in = *((struct net_device **)(skb->cb)); | |
702 | } | |
fc38582d | 703 | nf_bridge_push_encap_header(skb); |
e179e632 | 704 | |
713aefa3 | 705 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 706 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
707 | return 0; |
708 | } | |
709 | ||
710 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
711 | * netfilter with indev and outdev set to the bridge device, | |
712 | * but we are still able to filter on the 'real' indev/outdev | |
713 | * because of the physdev module. For ARP, indev and outdev are the | |
714 | * bridge ports. */ | |
3db05fea | 715 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
716 | const struct net_device *in, |
717 | const struct net_device *out, | |
718 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 719 | { |
1da177e4 | 720 | struct nf_bridge_info *nf_bridge; |
5dce971a | 721 | struct net_device *parent; |
76108cea | 722 | u_int8_t pf; |
1da177e4 LT |
723 | |
724 | if (!skb->nf_bridge) | |
725 | return NF_ACCEPT; | |
726 | ||
2dc2f207 PM |
727 | /* Need exclusive nf_bridge_info since we might have multiple |
728 | * different physoutdevs. */ | |
729 | if (!nf_bridge_unshare(skb)) | |
730 | return NF_DROP; | |
731 | ||
5dce971a SH |
732 | parent = bridge_parent(out); |
733 | if (!parent) | |
734 | return NF_DROP; | |
735 | ||
516299d2 MM |
736 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
737 | IS_PPPOE_IP(skb)) | |
1da177e4 | 738 | pf = PF_INET; |
a2bd40ad HX |
739 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
740 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 741 | pf = PF_INET6; |
a2bd40ad HX |
742 | else |
743 | return NF_ACCEPT; | |
1da177e4 | 744 | |
3db05fea | 745 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 746 | |
1da177e4 LT |
747 | nf_bridge = skb->nf_bridge; |
748 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
749 | skb->pkt_type = PACKET_HOST; | |
750 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
751 | } | |
752 | ||
753 | /* The physdev module checks on this */ | |
754 | nf_bridge->mask |= BRNF_BRIDGED; | |
755 | nf_bridge->physoutdev = skb->dev; | |
e179e632 BDS |
756 | if (pf == PF_INET) |
757 | skb->protocol = htons(ETH_P_IP); | |
758 | else | |
759 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 760 | |
6e23ae2a | 761 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 762 | br_nf_forward_finish); |
1da177e4 LT |
763 | |
764 | return NF_STOLEN; | |
765 | } | |
766 | ||
3db05fea | 767 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
768 | const struct net_device *in, |
769 | const struct net_device *out, | |
770 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 771 | { |
4df53d8b PM |
772 | struct net_bridge_port *p; |
773 | struct net_bridge *br; | |
1da177e4 LT |
774 | struct net_device **d = (struct net_device **)(skb->cb); |
775 | ||
e490c1de | 776 | p = br_port_get_rcu(out); |
4df53d8b PM |
777 | if (p == NULL) |
778 | return NF_ACCEPT; | |
779 | br = p->br; | |
780 | ||
781 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 782 | return NF_ACCEPT; |
1da177e4 | 783 | |
f8a26028 | 784 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 785 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 786 | return NF_ACCEPT; |
3db05fea | 787 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
788 | } |
789 | ||
d0a92be0 | 790 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 791 | if (IS_VLAN_ARP(skb)) |
3db05fea | 792 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
793 | return NF_ACCEPT; |
794 | } | |
795 | *d = (struct net_device *)in; | |
fdc9314c | 796 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
797 | (struct net_device *)out, br_nf_forward_finish); |
798 | ||
799 | return NF_STOLEN; | |
800 | } | |
801 | ||
c197facc | 802 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
2e2f7aef PM |
803 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
804 | { | |
462fb2af BD |
805 | int ret; |
806 | ||
e179e632 | 807 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 808 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 809 | !skb_is_gso(skb)) { |
462fb2af BD |
810 | if (br_parse_ip_options(skb)) |
811 | /* Drop invalid packet */ | |
812 | return NF_DROP; | |
813 | ret = ip_fragment(skb, br_dev_queue_push_xmit); | |
87f94b4e | 814 | } else |
462fb2af BD |
815 | ret = br_dev_queue_push_xmit(skb); |
816 | ||
817 | return ret; | |
2e2f7aef | 818 | } |
c197facc | 819 | #else |
820 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
821 | { | |
822 | return br_dev_queue_push_xmit(skb); | |
823 | } | |
824 | #endif | |
1da177e4 LT |
825 | |
826 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 827 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
828 | const struct net_device *in, |
829 | const struct net_device *out, | |
830 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 831 | { |
3db05fea | 832 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 833 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 834 | u_int8_t pf; |
1da177e4 | 835 | |
ea2d9b41 | 836 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
837 | return NF_ACCEPT; |
838 | ||
5dce971a SH |
839 | if (!realoutdev) |
840 | return NF_DROP; | |
841 | ||
516299d2 MM |
842 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
843 | IS_PPPOE_IP(skb)) | |
1da177e4 | 844 | pf = PF_INET; |
a2bd40ad HX |
845 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
846 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 847 | pf = PF_INET6; |
a2bd40ad HX |
848 | else |
849 | return NF_ACCEPT; | |
1da177e4 | 850 | |
1da177e4 LT |
851 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
852 | * about the value of skb->pkt_type. */ | |
853 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
854 | skb->pkt_type = PACKET_HOST; | |
855 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
856 | } | |
857 | ||
fc38582d | 858 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 859 | nf_bridge_save_header(skb); |
e179e632 BDS |
860 | if (pf == PF_INET) |
861 | skb->protocol = htons(ETH_P_IP); | |
862 | else | |
863 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 864 | |
6e23ae2a | 865 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 866 | br_nf_dev_queue_xmit); |
1da177e4 LT |
867 | |
868 | return NF_STOLEN; | |
1da177e4 LT |
869 | } |
870 | ||
1da177e4 LT |
871 | /* IP/SABOTAGE *****************************************************/ |
872 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
873 | * for the second time. */ | |
3db05fea | 874 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
875 | const struct net_device *in, |
876 | const struct net_device *out, | |
877 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 878 | { |
3db05fea HX |
879 | if (skb->nf_bridge && |
880 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
881 | return NF_STOP; |
882 | } | |
883 | ||
884 | return NF_ACCEPT; | |
885 | } | |
886 | ||
ea2d9b41 BDS |
887 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
888 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 889 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
890 | { |
891 | .hook = br_nf_pre_routing, | |
892 | .owner = THIS_MODULE, | |
893 | .pf = PF_BRIDGE, | |
894 | .hooknum = NF_BR_PRE_ROUTING, | |
895 | .priority = NF_BR_PRI_BRNF, | |
896 | }, | |
897 | { | |
898 | .hook = br_nf_local_in, | |
899 | .owner = THIS_MODULE, | |
900 | .pf = PF_BRIDGE, | |
901 | .hooknum = NF_BR_LOCAL_IN, | |
902 | .priority = NF_BR_PRI_BRNF, | |
903 | }, | |
904 | { | |
905 | .hook = br_nf_forward_ip, | |
906 | .owner = THIS_MODULE, | |
907 | .pf = PF_BRIDGE, | |
908 | .hooknum = NF_BR_FORWARD, | |
909 | .priority = NF_BR_PRI_BRNF - 1, | |
910 | }, | |
911 | { | |
912 | .hook = br_nf_forward_arp, | |
913 | .owner = THIS_MODULE, | |
914 | .pf = PF_BRIDGE, | |
915 | .hooknum = NF_BR_FORWARD, | |
916 | .priority = NF_BR_PRI_BRNF, | |
917 | }, | |
1490fd89 CG |
918 | { |
919 | .hook = br_nf_post_routing, | |
920 | .owner = THIS_MODULE, | |
921 | .pf = PF_BRIDGE, | |
922 | .hooknum = NF_BR_POST_ROUTING, | |
923 | .priority = NF_BR_PRI_LAST, | |
924 | }, | |
925 | { | |
926 | .hook = ip_sabotage_in, | |
927 | .owner = THIS_MODULE, | |
928 | .pf = PF_INET, | |
929 | .hooknum = NF_INET_PRE_ROUTING, | |
930 | .priority = NF_IP_PRI_FIRST, | |
931 | }, | |
932 | { | |
933 | .hook = ip_sabotage_in, | |
934 | .owner = THIS_MODULE, | |
935 | .pf = PF_INET6, | |
936 | .hooknum = NF_INET_PRE_ROUTING, | |
937 | .priority = NF_IP6_PRI_FIRST, | |
938 | }, | |
1da177e4 LT |
939 | }; |
940 | ||
941 | #ifdef CONFIG_SYSCTL | |
942 | static | |
8d65af78 | 943 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 944 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
945 | { |
946 | int ret; | |
947 | ||
8d65af78 | 948 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
949 | |
950 | if (write && *(int *)(ctl->data)) | |
951 | *(int *)(ctl->data) = 1; | |
952 | return ret; | |
953 | } | |
954 | ||
955 | static ctl_table brnf_table[] = { | |
956 | { | |
1da177e4 LT |
957 | .procname = "bridge-nf-call-arptables", |
958 | .data = &brnf_call_arptables, | |
959 | .maxlen = sizeof(int), | |
960 | .mode = 0644, | |
6d9f239a | 961 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
962 | }, |
963 | { | |
1da177e4 LT |
964 | .procname = "bridge-nf-call-iptables", |
965 | .data = &brnf_call_iptables, | |
966 | .maxlen = sizeof(int), | |
967 | .mode = 0644, | |
6d9f239a | 968 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
969 | }, |
970 | { | |
1da177e4 LT |
971 | .procname = "bridge-nf-call-ip6tables", |
972 | .data = &brnf_call_ip6tables, | |
973 | .maxlen = sizeof(int), | |
974 | .mode = 0644, | |
6d9f239a | 975 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
976 | }, |
977 | { | |
1da177e4 LT |
978 | .procname = "bridge-nf-filter-vlan-tagged", |
979 | .data = &brnf_filter_vlan_tagged, | |
980 | .maxlen = sizeof(int), | |
981 | .mode = 0644, | |
6d9f239a | 982 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
983 | }, |
984 | { | |
516299d2 MM |
985 | .procname = "bridge-nf-filter-pppoe-tagged", |
986 | .data = &brnf_filter_pppoe_tagged, | |
987 | .maxlen = sizeof(int), | |
988 | .mode = 0644, | |
6d9f239a | 989 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 990 | }, |
f8572d8f | 991 | { } |
1da177e4 LT |
992 | }; |
993 | ||
b5ccd792 | 994 | static struct ctl_path brnf_path[] = { |
f8572d8f EB |
995 | { .procname = "net", }, |
996 | { .procname = "bridge", }, | |
b5ccd792 | 997 | { } |
1da177e4 LT |
998 | }; |
999 | #endif | |
1000 | ||
5eb87f45 | 1001 | int __init br_netfilter_init(void) |
1da177e4 | 1002 | { |
5eb87f45 | 1003 | int ret; |
1da177e4 | 1004 | |
fc66f95c | 1005 | ret = dst_entries_init(&fake_dst_ops); |
5eb87f45 | 1006 | if (ret < 0) |
1da177e4 | 1007 | return ret; |
fc66f95c ED |
1008 | |
1009 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
1010 | if (ret < 0) { | |
1011 | dst_entries_destroy(&fake_dst_ops); | |
1012 | return ret; | |
1013 | } | |
1da177e4 | 1014 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 1015 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 1016 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1017 | printk(KERN_WARNING |
1018 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 | 1019 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
fc66f95c | 1020 | dst_entries_destroy(&fake_dst_ops); |
5eb87f45 | 1021 | return -ENOMEM; |
1da177e4 LT |
1022 | } |
1023 | #endif | |
1da177e4 | 1024 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1025 | return 0; |
1026 | } | |
1027 | ||
1028 | void br_netfilter_fini(void) | |
1029 | { | |
5eb87f45 | 1030 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
1031 | #ifdef CONFIG_SYSCTL |
1032 | unregister_sysctl_table(brnf_sysctl_header); | |
1033 | #endif | |
fc66f95c | 1034 | dst_entries_destroy(&fake_dst_ops); |
1da177e4 | 1035 | } |