Commit | Line | Data |
---|---|---|
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; | |
4981682c | 57 | static int brnf_pass_vlan_indev __read_mostly = 0; |
1da177e4 | 58 | #else |
4df53d8b PM |
59 | #define brnf_call_iptables 1 |
60 | #define brnf_call_ip6tables 1 | |
61 | #define brnf_call_arptables 1 | |
47e0e1ca HX |
62 | #define brnf_filter_vlan_tagged 0 |
63 | #define brnf_filter_pppoe_tagged 0 | |
4981682c | 64 | #define brnf_pass_vlan_indev 0 |
1da177e4 LT |
65 | #endif |
66 | ||
739e4505 FW |
67 | #define IS_IP(skb) \ |
68 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) | |
69 | ||
70 | #define IS_IPV6(skb) \ | |
71 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) | |
72 | ||
73 | #define IS_ARP(skb) \ | |
74 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) | |
75 | ||
b6f99a21 | 76 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 | 77 | { |
13937911 JG |
78 | if (vlan_tx_tag_present(skb)) |
79 | return skb->protocol; | |
80 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
81 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
82 | else | |
83 | return 0; | |
8b42ec39 SH |
84 | } |
85 | ||
86 | #define IS_VLAN_IP(skb) \ | |
13937911 | 87 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
88 | brnf_filter_vlan_tagged) |
89 | ||
90 | #define IS_VLAN_IPV6(skb) \ | |
13937911 | 91 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
8b42ec39 SH |
92 | brnf_filter_vlan_tagged) |
93 | ||
94 | #define IS_VLAN_ARP(skb) \ | |
13937911 | 95 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
8b42ec39 | 96 | brnf_filter_vlan_tagged) |
1da177e4 | 97 | |
516299d2 MM |
98 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
99 | { | |
100 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
101 | sizeof(struct pppoe_hdr))); | |
102 | } | |
103 | ||
104 | #define IS_PPPOE_IP(skb) \ | |
105 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
106 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
107 | brnf_filter_pppoe_tagged) | |
108 | ||
109 | #define IS_PPPOE_IPV6(skb) \ | |
110 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
111 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
112 | brnf_filter_pppoe_tagged) | |
113 | ||
4adf0af6 SW |
114 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) |
115 | { | |
b5ed54e9 | 116 | struct net_bridge_port *port; |
117 | ||
118 | port = br_port_get_rcu(dev); | |
119 | return port ? &port->br->fake_rtable : NULL; | |
4adf0af6 | 120 | } |
1da177e4 | 121 | |
5dce971a SH |
122 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
123 | { | |
b5ed54e9 | 124 | struct net_bridge_port *port; |
5dce971a | 125 | |
b5ed54e9 | 126 | port = br_port_get_rcu(dev); |
127 | return port ? port->br->dev : NULL; | |
5dce971a | 128 | } |
1da177e4 | 129 | |
fdeabdef SH |
130 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
131 | { | |
132 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
133 | if (likely(skb->nf_bridge)) | |
134 | atomic_set(&(skb->nf_bridge->use), 1); | |
135 | ||
136 | return skb->nf_bridge; | |
137 | } | |
138 | ||
2dc2f207 PM |
139 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
140 | { | |
141 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
142 | ||
143 | if (atomic_read(&nf_bridge->use) > 1) { | |
144 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
145 | ||
146 | if (tmp) { | |
147 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
148 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 149 | } |
4c3a76ab | 150 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
151 | nf_bridge = tmp; |
152 | } | |
153 | return nf_bridge; | |
154 | } | |
155 | ||
fc38582d PM |
156 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
157 | { | |
158 | unsigned int len = nf_bridge_encap_header_len(skb); | |
159 | ||
160 | skb_push(skb, len); | |
161 | skb->network_header -= len; | |
162 | } | |
163 | ||
164 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 165 | { |
fc38582d PM |
166 | unsigned int len = nf_bridge_encap_header_len(skb); |
167 | ||
168 | skb_pull(skb, len); | |
169 | skb->network_header += len; | |
170 | } | |
fdeabdef | 171 | |
fc38582d PM |
172 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
173 | { | |
174 | unsigned int len = nf_bridge_encap_header_len(skb); | |
175 | ||
176 | skb_pull_rcsum(skb, len); | |
177 | skb->network_header += len; | |
178 | } | |
179 | ||
180 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
181 | { | |
182 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 183 | |
d626f62b ACM |
184 | skb_copy_from_linear_data_offset(skb, -header_size, |
185 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
186 | } |
187 | ||
462fb2af BD |
188 | /* When handing a packet over to the IP layer |
189 | * check whether we have a skb that is in the | |
190 | * expected format | |
191 | */ | |
192 | ||
d0280232 | 193 | static int br_parse_ip_options(struct sk_buff *skb) |
462fb2af BD |
194 | { |
195 | struct ip_options *opt; | |
b71d1d42 | 196 | const struct iphdr *iph; |
462fb2af BD |
197 | struct net_device *dev = skb->dev; |
198 | u32 len; | |
199 | ||
6caab7b0 SB |
200 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
201 | goto inhdr_error; | |
202 | ||
462fb2af BD |
203 | iph = ip_hdr(skb); |
204 | opt = &(IPCB(skb)->opt); | |
205 | ||
206 | /* Basic sanity checks */ | |
207 | if (iph->ihl < 5 || iph->version != 4) | |
208 | goto inhdr_error; | |
209 | ||
210 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
211 | goto inhdr_error; | |
212 | ||
213 | iph = ip_hdr(skb); | |
214 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
215 | goto inhdr_error; | |
216 | ||
217 | len = ntohs(iph->tot_len); | |
218 | if (skb->len < len) { | |
219 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
220 | goto drop; | |
221 | } else if (len < (iph->ihl*4)) | |
222 | goto inhdr_error; | |
223 | ||
224 | if (pskb_trim_rcsum(skb, len)) { | |
225 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
226 | goto drop; | |
227 | } | |
228 | ||
f8e9881c ED |
229 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
230 | if (iph->ihl == 5) | |
462fb2af | 231 | return 0; |
462fb2af BD |
232 | |
233 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
234 | if (ip_options_compile(dev_net(dev), opt, skb)) | |
235 | goto inhdr_error; | |
236 | ||
237 | /* Check correct handling of SRR option */ | |
238 | if (unlikely(opt->srr)) { | |
239 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
240 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) | |
241 | goto drop; | |
242 | ||
243 | if (ip_options_rcv_srr(skb)) | |
244 | goto drop; | |
245 | } | |
246 | ||
247 | return 0; | |
248 | ||
249 | inhdr_error: | |
250 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
251 | drop: | |
252 | return -1; | |
253 | } | |
254 | ||
1da177e4 LT |
255 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
256 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
257 | * bridge PRE_ROUTING hook. */ | |
258 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
259 | { | |
260 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 261 | struct rtable *rt; |
1da177e4 | 262 | |
1da177e4 LT |
263 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
264 | skb->pkt_type = PACKET_OTHERHOST; | |
265 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
266 | } | |
267 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
268 | ||
511c3f92 ED |
269 | rt = bridge_parent_rtable(nf_bridge->physindev); |
270 | if (!rt) { | |
4adf0af6 SW |
271 | kfree_skb(skb); |
272 | return 0; | |
273 | } | |
f9181f4f | 274 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
275 | |
276 | skb->dev = nf_bridge->physindev; | |
e179e632 | 277 | nf_bridge_update_protocol(skb); |
fc38582d | 278 | nf_bridge_push_encap_header(skb); |
713aefa3 | 279 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
280 | br_handle_frame_finish, 1); |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
e179e632 BDS |
285 | /* Obtain the correct destination MAC address, while preserving the original |
286 | * source MAC address. If we already know this address, we just copy it. If we | |
287 | * don't, we use the neighbour framework to find out. In both cases, we make | |
288 | * sure that br_handle_frame_finish() is called afterwards. | |
289 | */ | |
290 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
291 | { | |
292 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
f6b72b62 | 293 | struct neighbour *neigh; |
e179e632 BDS |
294 | struct dst_entry *dst; |
295 | ||
296 | skb->dev = bridge_parent(skb->dev); | |
297 | if (!skb->dev) | |
298 | goto free_skb; | |
299 | dst = skb_dst(skb); | |
f9d75166 DM |
300 | neigh = dst_neigh_lookup_skb(dst, skb); |
301 | if (neigh) { | |
302 | int ret; | |
303 | ||
304 | if (neigh->hh.hh_len) { | |
305 | neigh_hh_bridge(&neigh->hh, skb); | |
306 | skb->dev = nf_bridge->physindev; | |
307 | ret = br_handle_frame_finish(skb); | |
308 | } else { | |
309 | /* the neighbour function below overwrites the complete | |
310 | * MAC header, so we save the Ethernet source address and | |
311 | * protocol number. | |
312 | */ | |
313 | skb_copy_from_linear_data_offset(skb, | |
314 | -(ETH_HLEN-ETH_ALEN), | |
315 | skb->nf_bridge->data, | |
316 | ETH_HLEN-ETH_ALEN); | |
317 | /* tell br_dev_xmit to continue with forwarding */ | |
318 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
93fdd47e | 319 | /* FIXME Need to refragment */ |
f9d75166 DM |
320 | ret = neigh->output(neigh, skb); |
321 | } | |
322 | neigh_release(neigh); | |
323 | return ret; | |
e179e632 BDS |
324 | } |
325 | free_skb: | |
326 | kfree_skb(skb); | |
327 | return 0; | |
328 | } | |
329 | ||
1da177e4 | 330 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 331 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
332 | * |
333 | * There are two cases to consider: | |
334 | * 1. The packet was DNAT'ed to a device in the same bridge | |
335 | * port group as it was received on. We can still bridge | |
336 | * the packet. | |
337 | * 2. The packet was DNAT'ed to a different device, either | |
338 | * a non-bridged device or another bridge port group. | |
339 | * The packet will need to be routed. | |
340 | * | |
341 | * The correct way of distinguishing between these two cases is to | |
342 | * call ip_route_input() and to look at skb->dst->dev, which is | |
343 | * changed to the destination device if ip_route_input() succeeds. | |
344 | * | |
ea2d9b41 | 345 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 346 | * |
ea2d9b41 BDS |
347 | * If the output device equals the logical bridge device the packet |
348 | * came in on, we can consider this bridging. The corresponding MAC | |
349 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
350 | * Otherwise, the packet is considered to be routed and we just |
351 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
352 | * later be passed up to the IP stack to be routed. For a redirected |
353 | * packet, ip_route_input() will give back the localhost as output device, | |
354 | * which differs from the bridge device. | |
1da177e4 | 355 | * |
ea2d9b41 | 356 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 357 | * |
f216f082 BDS |
358 | * This can be because the destination address is martian, in which case |
359 | * the packet will be dropped. | |
ea2d9b41 BDS |
360 | * If IP forwarding is disabled, ip_route_input() will fail, while |
361 | * ip_route_output_key() can return success. The source | |
362 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 363 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
364 | * if IP forwarding is enabled. If the output device equals the logical bridge |
365 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
366 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
367 | */ | |
1da177e4 LT |
368 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
369 | { | |
370 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 371 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 372 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 373 | struct rtable *rt; |
f216f082 | 374 | int err; |
93fdd47e HX |
375 | int frag_max_size; |
376 | ||
377 | frag_max_size = IPCB(skb)->frag_max_size; | |
378 | BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size; | |
1da177e4 | 379 | |
1da177e4 LT |
380 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
381 | skb->pkt_type = PACKET_OTHERHOST; | |
382 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
383 | } | |
384 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 385 | if (dnat_took_place(skb)) { |
f216f082 | 386 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 387 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
388 | |
389 | /* If err equals -EHOSTUNREACH the error is due to a | |
390 | * martian destination or due to the fact that | |
391 | * forwarding is disabled. For most martian packets, | |
392 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
393 | * martian destinations: loopback destinations and destination | |
394 | * 0.0.0.0. In both cases the packet will be dropped because the | |
395 | * destination is the loopback device and not the bridge. */ | |
396 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
397 | goto free_skb; | |
1da177e4 | 398 | |
78fbfd8a DM |
399 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
400 | RT_TOS(iph->tos), 0); | |
b23dd4fe | 401 | if (!IS_ERR(rt)) { |
1c011bed | 402 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 403 | * require ip_forwarding. */ |
b23dd4fe DM |
404 | if (rt->dst.dev == dev) { |
405 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
406 | goto bridged_dnat; |
407 | } | |
b23dd4fe | 408 | ip_rt_put(rt); |
1da177e4 | 409 | } |
f216f082 | 410 | free_skb: |
1da177e4 LT |
411 | kfree_skb(skb); |
412 | return 0; | |
413 | } else { | |
adf30907 | 414 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 415 | bridged_dnat: |
1da177e4 | 416 | skb->dev = nf_bridge->physindev; |
e179e632 | 417 | nf_bridge_update_protocol(skb); |
fc38582d | 418 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
419 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
420 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
421 | skb, skb->dev, NULL, |
422 | br_nf_pre_routing_finish_bridge, | |
423 | 1); | |
424 | return 0; | |
425 | } | |
04091142 | 426 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
1da177e4 LT |
427 | skb->pkt_type = PACKET_HOST; |
428 | } | |
429 | } else { | |
511c3f92 ED |
430 | rt = bridge_parent_rtable(nf_bridge->physindev); |
431 | if (!rt) { | |
4adf0af6 SW |
432 | kfree_skb(skb); |
433 | return 0; | |
434 | } | |
f9181f4f | 435 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
436 | } |
437 | ||
438 | skb->dev = nf_bridge->physindev; | |
e179e632 | 439 | nf_bridge_update_protocol(skb); |
fc38582d | 440 | nf_bridge_push_encap_header(skb); |
713aefa3 | 441 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
442 | br_handle_frame_finish, 1); |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
4981682c PNA |
447 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
448 | { | |
449 | struct net_device *vlan, *br; | |
450 | ||
451 | br = bridge_parent(dev); | |
452 | if (brnf_pass_vlan_indev == 0 || !vlan_tx_tag_present(skb)) | |
453 | return br; | |
454 | ||
f06c7f9f | 455 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
1fd9b1fc | 456 | vlan_tx_tag_get(skb) & VLAN_VID_MASK); |
4981682c PNA |
457 | |
458 | return vlan ? vlan : br; | |
459 | } | |
460 | ||
1da177e4 | 461 | /* Some common code for IPv4/IPv6 */ |
5dce971a | 462 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
463 | { |
464 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
465 | ||
466 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
467 | skb->pkt_type = PACKET_HOST; | |
468 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
469 | } | |
470 | ||
471 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
472 | nf_bridge->physindev = skb->dev; | |
4981682c | 473 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
e179e632 BDS |
474 | if (skb->protocol == htons(ETH_P_8021Q)) |
475 | nf_bridge->mask |= BRNF_8021Q; | |
476 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
477 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a | 478 | |
6b8dbcf2 FW |
479 | /* Must drop socket now because of tproxy. */ |
480 | skb_orphan(skb); | |
5dce971a | 481 | return skb->dev; |
1da177e4 LT |
482 | } |
483 | ||
484 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
485 | static int check_hbh_len(struct sk_buff *skb) | |
486 | { | |
0660e03f | 487 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 488 | u32 pkt_len; |
d56f90a7 ACM |
489 | const unsigned char *nh = skb_network_header(skb); |
490 | int off = raw - nh; | |
789bc3e5 | 491 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
492 | |
493 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
494 | goto bad; | |
495 | ||
496 | off += 2; | |
497 | len -= 2; | |
498 | ||
499 | while (len > 0) { | |
d56f90a7 | 500 | int optlen = nh[off + 1] + 2; |
1da177e4 | 501 | |
d56f90a7 | 502 | switch (nh[off]) { |
1de5a71c | 503 | case IPV6_TLV_PAD1: |
1da177e4 LT |
504 | optlen = 1; |
505 | break; | |
506 | ||
507 | case IPV6_TLV_PADN: | |
508 | break; | |
509 | ||
510 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 511 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 512 | goto bad; |
d56f90a7 | 513 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 514 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 515 | ipv6_hdr(skb)->payload_len) |
b0366486 | 516 | goto bad; |
1da177e4 LT |
517 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
518 | goto bad; | |
b0366486 | 519 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 520 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 521 | goto bad; |
d56f90a7 | 522 | nh = skb_network_header(skb); |
1da177e4 LT |
523 | break; |
524 | default: | |
525 | if (optlen > len) | |
526 | goto bad; | |
527 | break; | |
528 | } | |
529 | off += optlen; | |
530 | len -= optlen; | |
531 | } | |
532 | if (len == 0) | |
533 | return 0; | |
534 | bad: | |
535 | return -1; | |
536 | ||
537 | } | |
538 | ||
539 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
540 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
795aa6ef | 541 | static unsigned int br_nf_pre_routing_ipv6(const struct nf_hook_ops *ops, |
789bc3e5 SH |
542 | struct sk_buff *skb, |
543 | const struct net_device *in, | |
544 | const struct net_device *out, | |
545 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 546 | { |
b71d1d42 | 547 | const struct ipv6hdr *hdr; |
1da177e4 | 548 | u32 pkt_len; |
1da177e4 LT |
549 | |
550 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 551 | return NF_DROP; |
1da177e4 LT |
552 | |
553 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 554 | return NF_DROP; |
1da177e4 | 555 | |
0660e03f | 556 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
557 | |
558 | if (hdr->version != 6) | |
deef4b52 | 559 | return NF_DROP; |
1da177e4 LT |
560 | |
561 | pkt_len = ntohs(hdr->payload_len); | |
562 | ||
563 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
564 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 565 | return NF_DROP; |
b38dfee3 | 566 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 567 | return NF_DROP; |
1da177e4 LT |
568 | } |
569 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 570 | return NF_DROP; |
1da177e4 | 571 | |
789bc3e5 | 572 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 573 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 574 | return NF_DROP; |
5dce971a SH |
575 | if (!setup_pre_routing(skb)) |
576 | return NF_DROP; | |
1da177e4 | 577 | |
e179e632 | 578 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 579 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
580 | br_nf_pre_routing_finish_ipv6); |
581 | ||
582 | return NF_STOLEN; | |
1da177e4 LT |
583 | } |
584 | ||
585 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
586 | * Replicate the checks that IPv4 does on packet reception. | |
587 | * Set skb->dev to the bridge device (i.e. parent of the | |
588 | * receiving device) to make netfilter happy, the REDIRECT | |
589 | * target in particular. Save the original destination IP | |
590 | * address to be able to detect DNAT afterwards. */ | |
795aa6ef PM |
591 | static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops, |
592 | struct sk_buff *skb, | |
ee02b3a6 SH |
593 | const struct net_device *in, |
594 | const struct net_device *out, | |
595 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 596 | { |
4df53d8b PM |
597 | struct net_bridge_port *p; |
598 | struct net_bridge *br; | |
e7c243c9 EP |
599 | __u32 len = nf_bridge_encap_header_len(skb); |
600 | ||
e7c243c9 | 601 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 602 | return NF_DROP; |
1da177e4 | 603 | |
e490c1de | 604 | p = br_port_get_rcu(in); |
4df53d8b | 605 | if (p == NULL) |
deef4b52 | 606 | return NF_DROP; |
4df53d8b PM |
607 | br = p->br; |
608 | ||
739e4505 | 609 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
4df53d8b | 610 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 611 | return NF_ACCEPT; |
4df53d8b | 612 | |
fc38582d | 613 | nf_bridge_pull_encap_header_rcsum(skb); |
795aa6ef | 614 | return br_nf_pre_routing_ipv6(ops, skb, in, out, okfn); |
1da177e4 | 615 | } |
4df53d8b PM |
616 | |
617 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 618 | return NF_ACCEPT; |
1da177e4 | 619 | |
739e4505 | 620 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
1da177e4 LT |
621 | return NF_ACCEPT; |
622 | ||
fc38582d | 623 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 624 | |
462fb2af | 625 | if (br_parse_ip_options(skb)) |
deef4b52 | 626 | return NF_DROP; |
17762060 | 627 | |
789bc3e5 | 628 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 629 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 630 | return NF_DROP; |
5dce971a SH |
631 | if (!setup_pre_routing(skb)) |
632 | return NF_DROP; | |
1da177e4 | 633 | store_orig_dstaddr(skb); |
e179e632 | 634 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 635 | |
713aefa3 | 636 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
637 | br_nf_pre_routing_finish); |
638 | ||
639 | return NF_STOLEN; | |
1da177e4 LT |
640 | } |
641 | ||
642 | ||
643 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
644 | /* The packet is locally destined, which requires a real | |
645 | * dst_entry, so detach the fake one. On the way up, the | |
646 | * packet would pass through PRE_ROUTING again (which already | |
647 | * took place when the packet entered the bridge), but we | |
648 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
649 | * prevent this from happening. */ | |
795aa6ef PM |
650 | static unsigned int br_nf_local_in(const struct nf_hook_ops *ops, |
651 | struct sk_buff *skb, | |
789bc3e5 SH |
652 | const struct net_device *in, |
653 | const struct net_device *out, | |
654 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 655 | { |
a881e963 | 656 | br_drop_fake_rtable(skb); |
1da177e4 LT |
657 | return NF_ACCEPT; |
658 | } | |
659 | ||
1da177e4 LT |
660 | /* PF_BRIDGE/FORWARD *************************************************/ |
661 | static int br_nf_forward_finish(struct sk_buff *skb) | |
662 | { | |
663 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
664 | struct net_device *in; | |
1da177e4 | 665 | |
739e4505 | 666 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
667 | in = nf_bridge->physindev; |
668 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
669 | skb->pkt_type = PACKET_OTHERHOST; | |
670 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
671 | } | |
e94c6743 | 672 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
673 | } else { |
674 | in = *((struct net_device **)(skb->cb)); | |
675 | } | |
fc38582d | 676 | nf_bridge_push_encap_header(skb); |
e179e632 | 677 | |
713aefa3 | 678 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 679 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
680 | return 0; |
681 | } | |
682 | ||
739e4505 | 683 | |
1da177e4 LT |
684 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
685 | * netfilter with indev and outdev set to the bridge device, | |
686 | * but we are still able to filter on the 'real' indev/outdev | |
687 | * because of the physdev module. For ARP, indev and outdev are the | |
688 | * bridge ports. */ | |
795aa6ef PM |
689 | static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops, |
690 | struct sk_buff *skb, | |
789bc3e5 SH |
691 | const struct net_device *in, |
692 | const struct net_device *out, | |
693 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 694 | { |
1da177e4 | 695 | struct nf_bridge_info *nf_bridge; |
5dce971a | 696 | struct net_device *parent; |
76108cea | 697 | u_int8_t pf; |
1da177e4 LT |
698 | |
699 | if (!skb->nf_bridge) | |
700 | return NF_ACCEPT; | |
701 | ||
2dc2f207 PM |
702 | /* Need exclusive nf_bridge_info since we might have multiple |
703 | * different physoutdevs. */ | |
704 | if (!nf_bridge_unshare(skb)) | |
705 | return NF_DROP; | |
706 | ||
5dce971a SH |
707 | parent = bridge_parent(out); |
708 | if (!parent) | |
709 | return NF_DROP; | |
710 | ||
739e4505 | 711 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 712 | pf = NFPROTO_IPV4; |
739e4505 | 713 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 714 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
715 | else |
716 | return NF_ACCEPT; | |
1da177e4 | 717 | |
3db05fea | 718 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 719 | |
1da177e4 LT |
720 | nf_bridge = skb->nf_bridge; |
721 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
722 | skb->pkt_type = PACKET_HOST; | |
723 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
724 | } | |
725 | ||
aa740f46 | 726 | if (pf == NFPROTO_IPV4 && br_parse_ip_options(skb)) |
6b1e960f HX |
727 | return NF_DROP; |
728 | ||
1da177e4 LT |
729 | /* The physdev module checks on this */ |
730 | nf_bridge->mask |= BRNF_BRIDGED; | |
731 | nf_bridge->physoutdev = skb->dev; | |
aa740f46 | 732 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
733 | skb->protocol = htons(ETH_P_IP); |
734 | else | |
735 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 736 | |
4981682c | 737 | NF_HOOK(pf, NF_INET_FORWARD, skb, brnf_get_logical_dev(skb, in), parent, |
5dce971a | 738 | br_nf_forward_finish); |
1da177e4 LT |
739 | |
740 | return NF_STOLEN; | |
741 | } | |
742 | ||
795aa6ef PM |
743 | static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, |
744 | struct sk_buff *skb, | |
789bc3e5 SH |
745 | const struct net_device *in, |
746 | const struct net_device *out, | |
747 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 748 | { |
4df53d8b PM |
749 | struct net_bridge_port *p; |
750 | struct net_bridge *br; | |
1da177e4 LT |
751 | struct net_device **d = (struct net_device **)(skb->cb); |
752 | ||
e490c1de | 753 | p = br_port_get_rcu(out); |
4df53d8b PM |
754 | if (p == NULL) |
755 | return NF_ACCEPT; | |
756 | br = p->br; | |
757 | ||
758 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 759 | return NF_ACCEPT; |
1da177e4 | 760 | |
739e4505 | 761 | if (!IS_ARP(skb)) { |
8b42ec39 | 762 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 763 | return NF_ACCEPT; |
3db05fea | 764 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
765 | } |
766 | ||
d0a92be0 | 767 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 768 | if (IS_VLAN_ARP(skb)) |
3db05fea | 769 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
770 | return NF_ACCEPT; |
771 | } | |
772 | *d = (struct net_device *)in; | |
fdc9314c | 773 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
774 | (struct net_device *)out, br_nf_forward_finish); |
775 | ||
776 | return NF_STOLEN; | |
777 | } | |
778 | ||
aff09ce3 | 779 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
2e2f7aef PM |
780 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
781 | { | |
462fb2af | 782 | int ret; |
93fdd47e | 783 | int frag_max_size; |
462fb2af | 784 | |
93fdd47e HX |
785 | /* This is wrong! We should preserve the original fragment |
786 | * boundaries by preserving frag_list rather than refragmenting. | |
787 | */ | |
aff09ce3 | 788 | if (skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 789 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 790 | !skb_is_gso(skb)) { |
93fdd47e | 791 | frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size; |
462fb2af BD |
792 | if (br_parse_ip_options(skb)) |
793 | /* Drop invalid packet */ | |
794 | return NF_DROP; | |
93fdd47e | 795 | IPCB(skb)->frag_max_size = frag_max_size; |
462fb2af | 796 | ret = ip_fragment(skb, br_dev_queue_push_xmit); |
87f94b4e | 797 | } else |
462fb2af BD |
798 | ret = br_dev_queue_push_xmit(skb); |
799 | ||
800 | return ret; | |
2e2f7aef | 801 | } |
c197facc | 802 | #else |
803 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
804 | { | |
805 | return br_dev_queue_push_xmit(skb); | |
806 | } | |
807 | #endif | |
1da177e4 LT |
808 | |
809 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
795aa6ef PM |
810 | static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops, |
811 | struct sk_buff *skb, | |
789bc3e5 SH |
812 | const struct net_device *in, |
813 | const struct net_device *out, | |
814 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 815 | { |
3db05fea | 816 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 817 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 818 | u_int8_t pf; |
1da177e4 | 819 | |
ea2d9b41 | 820 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
821 | return NF_ACCEPT; |
822 | ||
5dce971a SH |
823 | if (!realoutdev) |
824 | return NF_DROP; | |
825 | ||
739e4505 | 826 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 827 | pf = NFPROTO_IPV4; |
739e4505 | 828 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 829 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
830 | else |
831 | return NF_ACCEPT; | |
1da177e4 | 832 | |
1da177e4 LT |
833 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
834 | * about the value of skb->pkt_type. */ | |
835 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
836 | skb->pkt_type = PACKET_HOST; | |
837 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
838 | } | |
839 | ||
fc38582d | 840 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 841 | nf_bridge_save_header(skb); |
aa740f46 | 842 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
843 | skb->protocol = htons(ETH_P_IP); |
844 | else | |
845 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 846 | |
6e23ae2a | 847 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 848 | br_nf_dev_queue_xmit); |
1da177e4 LT |
849 | |
850 | return NF_STOLEN; | |
1da177e4 LT |
851 | } |
852 | ||
1da177e4 LT |
853 | /* IP/SABOTAGE *****************************************************/ |
854 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
855 | * for the second time. */ | |
795aa6ef PM |
856 | static unsigned int ip_sabotage_in(const struct nf_hook_ops *ops, |
857 | struct sk_buff *skb, | |
789bc3e5 SH |
858 | const struct net_device *in, |
859 | const struct net_device *out, | |
860 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 861 | { |
3db05fea HX |
862 | if (skb->nf_bridge && |
863 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
864 | return NF_STOP; |
865 | } | |
866 | ||
867 | return NF_ACCEPT; | |
868 | } | |
869 | ||
4b7fd5d9 PNA |
870 | void br_netfilter_enable(void) |
871 | { | |
872 | } | |
873 | EXPORT_SYMBOL_GPL(br_netfilter_enable); | |
874 | ||
ea2d9b41 BDS |
875 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
876 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 877 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
878 | { |
879 | .hook = br_nf_pre_routing, | |
880 | .owner = THIS_MODULE, | |
aa740f46 | 881 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
882 | .hooknum = NF_BR_PRE_ROUTING, |
883 | .priority = NF_BR_PRI_BRNF, | |
884 | }, | |
885 | { | |
886 | .hook = br_nf_local_in, | |
887 | .owner = THIS_MODULE, | |
aa740f46 | 888 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
889 | .hooknum = NF_BR_LOCAL_IN, |
890 | .priority = NF_BR_PRI_BRNF, | |
891 | }, | |
892 | { | |
893 | .hook = br_nf_forward_ip, | |
894 | .owner = THIS_MODULE, | |
aa740f46 | 895 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
896 | .hooknum = NF_BR_FORWARD, |
897 | .priority = NF_BR_PRI_BRNF - 1, | |
898 | }, | |
899 | { | |
900 | .hook = br_nf_forward_arp, | |
901 | .owner = THIS_MODULE, | |
aa740f46 | 902 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
903 | .hooknum = NF_BR_FORWARD, |
904 | .priority = NF_BR_PRI_BRNF, | |
905 | }, | |
1490fd89 CG |
906 | { |
907 | .hook = br_nf_post_routing, | |
908 | .owner = THIS_MODULE, | |
aa740f46 | 909 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
910 | .hooknum = NF_BR_POST_ROUTING, |
911 | .priority = NF_BR_PRI_LAST, | |
912 | }, | |
913 | { | |
914 | .hook = ip_sabotage_in, | |
915 | .owner = THIS_MODULE, | |
aa740f46 | 916 | .pf = NFPROTO_IPV4, |
1490fd89 CG |
917 | .hooknum = NF_INET_PRE_ROUTING, |
918 | .priority = NF_IP_PRI_FIRST, | |
919 | }, | |
920 | { | |
921 | .hook = ip_sabotage_in, | |
922 | .owner = THIS_MODULE, | |
aa740f46 | 923 | .pf = NFPROTO_IPV6, |
1490fd89 CG |
924 | .hooknum = NF_INET_PRE_ROUTING, |
925 | .priority = NF_IP6_PRI_FIRST, | |
926 | }, | |
1da177e4 LT |
927 | }; |
928 | ||
929 | #ifdef CONFIG_SYSCTL | |
930 | static | |
fe2c6338 | 931 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
56b148eb | 932 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
933 | { |
934 | int ret; | |
935 | ||
8d65af78 | 936 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
937 | |
938 | if (write && *(int *)(ctl->data)) | |
939 | *(int *)(ctl->data) = 1; | |
940 | return ret; | |
941 | } | |
942 | ||
fe2c6338 | 943 | static struct ctl_table brnf_table[] = { |
1da177e4 | 944 | { |
1da177e4 LT |
945 | .procname = "bridge-nf-call-arptables", |
946 | .data = &brnf_call_arptables, | |
947 | .maxlen = sizeof(int), | |
948 | .mode = 0644, | |
6d9f239a | 949 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
950 | }, |
951 | { | |
1da177e4 LT |
952 | .procname = "bridge-nf-call-iptables", |
953 | .data = &brnf_call_iptables, | |
954 | .maxlen = sizeof(int), | |
955 | .mode = 0644, | |
6d9f239a | 956 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
957 | }, |
958 | { | |
1da177e4 LT |
959 | .procname = "bridge-nf-call-ip6tables", |
960 | .data = &brnf_call_ip6tables, | |
961 | .maxlen = sizeof(int), | |
962 | .mode = 0644, | |
6d9f239a | 963 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
964 | }, |
965 | { | |
1da177e4 LT |
966 | .procname = "bridge-nf-filter-vlan-tagged", |
967 | .data = &brnf_filter_vlan_tagged, | |
968 | .maxlen = sizeof(int), | |
969 | .mode = 0644, | |
6d9f239a | 970 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
971 | }, |
972 | { | |
516299d2 MM |
973 | .procname = "bridge-nf-filter-pppoe-tagged", |
974 | .data = &brnf_filter_pppoe_tagged, | |
975 | .maxlen = sizeof(int), | |
976 | .mode = 0644, | |
6d9f239a | 977 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 978 | }, |
4981682c PNA |
979 | { |
980 | .procname = "bridge-nf-pass-vlan-input-dev", | |
981 | .data = &brnf_pass_vlan_indev, | |
982 | .maxlen = sizeof(int), | |
983 | .mode = 0644, | |
984 | .proc_handler = brnf_sysctl_call_tables, | |
985 | }, | |
f8572d8f | 986 | { } |
1da177e4 | 987 | }; |
1da177e4 LT |
988 | #endif |
989 | ||
34666d46 | 990 | static int __init br_netfilter_init(void) |
1da177e4 | 991 | { |
5eb87f45 | 992 | int ret; |
1da177e4 | 993 | |
34666d46 | 994 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
5eb87f45 | 995 | if (ret < 0) |
1da177e4 | 996 | return ret; |
fc66f95c | 997 | |
1da177e4 | 998 | #ifdef CONFIG_SYSCTL |
ec8f23ce | 999 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
1da177e4 | 1000 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1001 | printk(KERN_WARNING |
1002 | "br_netfilter: can't register to sysctl.\n"); | |
34666d46 PNA |
1003 | ret = -ENOMEM; |
1004 | goto err1; | |
1da177e4 LT |
1005 | } |
1006 | #endif | |
1da177e4 | 1007 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 | 1008 | return 0; |
34666d46 PNA |
1009 | err1: |
1010 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
1011 | return ret; | |
1da177e4 LT |
1012 | } |
1013 | ||
34666d46 | 1014 | static void __exit br_netfilter_fini(void) |
1da177e4 | 1015 | { |
5eb87f45 | 1016 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 | 1017 | #ifdef CONFIG_SYSCTL |
5dd3df10 | 1018 | unregister_net_sysctl_table(brnf_sysctl_header); |
1da177e4 LT |
1019 | #endif |
1020 | } | |
34666d46 PNA |
1021 | |
1022 | module_init(br_netfilter_init); | |
1023 | module_exit(br_netfilter_fini); | |
1024 | ||
1025 | MODULE_LICENSE("GPL"); | |
1026 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); | |
1027 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); | |
1028 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |