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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> | |
efb6de9b | 37 | #include <net/addrconf.h> |
14c85021 | 38 | #include <net/route.h> |
56768644 | 39 | #include <net/netfilter/br_netfilter.h> |
14c85021 | 40 | |
1da177e4 | 41 | #include <asm/uaccess.h> |
1da177e4 LT |
42 | #include "br_private.h" |
43 | #ifdef CONFIG_SYSCTL | |
44 | #include <linux/sysctl.h> | |
45 | #endif | |
46 | ||
1da177e4 LT |
47 | #ifdef CONFIG_SYSCTL |
48 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
49 | static int brnf_call_iptables __read_mostly = 1; |
50 | static int brnf_call_ip6tables __read_mostly = 1; | |
51 | static int brnf_call_arptables __read_mostly = 1; | |
f4b3eee7 BT |
52 | static int brnf_filter_vlan_tagged __read_mostly; |
53 | static int brnf_filter_pppoe_tagged __read_mostly; | |
54 | static int brnf_pass_vlan_indev __read_mostly; | |
1da177e4 | 55 | #else |
4df53d8b PM |
56 | #define brnf_call_iptables 1 |
57 | #define brnf_call_ip6tables 1 | |
58 | #define brnf_call_arptables 1 | |
47e0e1ca HX |
59 | #define brnf_filter_vlan_tagged 0 |
60 | #define brnf_filter_pppoe_tagged 0 | |
4981682c | 61 | #define brnf_pass_vlan_indev 0 |
1da177e4 LT |
62 | #endif |
63 | ||
739e4505 | 64 | #define IS_IP(skb) \ |
df8a39de | 65 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) |
739e4505 FW |
66 | |
67 | #define IS_IPV6(skb) \ | |
df8a39de | 68 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) |
739e4505 FW |
69 | |
70 | #define IS_ARP(skb) \ | |
df8a39de | 71 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) |
739e4505 | 72 | |
b6f99a21 | 73 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 | 74 | { |
df8a39de | 75 | if (skb_vlan_tag_present(skb)) |
13937911 JG |
76 | return skb->protocol; |
77 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
78 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
79 | else | |
80 | return 0; | |
8b42ec39 SH |
81 | } |
82 | ||
83 | #define IS_VLAN_IP(skb) \ | |
13937911 | 84 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
85 | brnf_filter_vlan_tagged) |
86 | ||
87 | #define IS_VLAN_IPV6(skb) \ | |
13937911 | 88 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
8b42ec39 SH |
89 | brnf_filter_vlan_tagged) |
90 | ||
91 | #define IS_VLAN_ARP(skb) \ | |
13937911 | 92 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
8b42ec39 | 93 | brnf_filter_vlan_tagged) |
1da177e4 | 94 | |
516299d2 MM |
95 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
96 | { | |
97 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
98 | sizeof(struct pppoe_hdr))); | |
99 | } | |
100 | ||
101 | #define IS_PPPOE_IP(skb) \ | |
102 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
103 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
104 | brnf_filter_pppoe_tagged) | |
105 | ||
106 | #define IS_PPPOE_IPV6(skb) \ | |
107 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
108 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
109 | brnf_filter_pppoe_tagged) | |
110 | ||
e70deecb FW |
111 | /* largest possible L2 header, see br_nf_dev_queue_xmit() */ |
112 | #define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN) | |
113 | ||
a1bc1b35 | 114 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) || IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
e70deecb FW |
115 | struct brnf_frag_data { |
116 | char mac[NF_BRIDGE_MAX_MAC_HEADER_LENGTH]; | |
117 | u8 encap_size; | |
118 | u8 size; | |
d7b59742 FW |
119 | u16 vlan_tci; |
120 | __be16 vlan_proto; | |
e70deecb FW |
121 | }; |
122 | ||
123 | static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage); | |
124 | #endif | |
125 | ||
a9fcc6a4 FW |
126 | static void nf_bridge_info_free(struct sk_buff *skb) |
127 | { | |
128 | if (skb->nf_bridge) { | |
129 | nf_bridge_put(skb->nf_bridge); | |
130 | skb->nf_bridge = NULL; | |
131 | } | |
132 | } | |
133 | ||
5dce971a SH |
134 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
135 | { | |
b5ed54e9 | 136 | struct net_bridge_port *port; |
5dce971a | 137 | |
b5ed54e9 | 138 | port = br_port_get_rcu(dev); |
139 | return port ? port->br->dev : NULL; | |
5dce971a | 140 | } |
1da177e4 | 141 | |
2dc2f207 PM |
142 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
143 | { | |
144 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
145 | ||
146 | if (atomic_read(&nf_bridge->use) > 1) { | |
147 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
148 | ||
149 | if (tmp) { | |
150 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
151 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 152 | } |
4c3a76ab | 153 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
154 | nf_bridge = tmp; |
155 | } | |
156 | return nf_bridge; | |
157 | } | |
158 | ||
230ac490 | 159 | unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb) |
8d045163 FW |
160 | { |
161 | switch (skb->protocol) { | |
162 | case __cpu_to_be16(ETH_P_8021Q): | |
163 | return VLAN_HLEN; | |
164 | case __cpu_to_be16(ETH_P_PPP_SES): | |
165 | return PPPOE_SES_HLEN; | |
166 | default: | |
167 | return 0; | |
168 | } | |
169 | } | |
170 | ||
fc38582d | 171 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) |
fdeabdef | 172 | { |
fc38582d PM |
173 | unsigned int len = nf_bridge_encap_header_len(skb); |
174 | ||
175 | skb_pull(skb, len); | |
176 | skb->network_header += len; | |
177 | } | |
fdeabdef | 178 | |
fc38582d PM |
179 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
180 | { | |
181 | unsigned int len = nf_bridge_encap_header_len(skb); | |
182 | ||
183 | skb_pull_rcsum(skb, len); | |
184 | skb->network_header += len; | |
185 | } | |
186 | ||
462fb2af BD |
187 | /* When handing a packet over to the IP layer |
188 | * check whether we have a skb that is in the | |
189 | * expected format | |
190 | */ | |
191 | ||
77d574e7 | 192 | static int br_validate_ipv4(struct sk_buff *skb) |
462fb2af | 193 | { |
b71d1d42 | 194 | const struct iphdr *iph; |
462fb2af BD |
195 | struct net_device *dev = skb->dev; |
196 | u32 len; | |
197 | ||
6caab7b0 SB |
198 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
199 | goto inhdr_error; | |
200 | ||
462fb2af | 201 | iph = ip_hdr(skb); |
462fb2af BD |
202 | |
203 | /* Basic sanity checks */ | |
204 | if (iph->ihl < 5 || iph->version != 4) | |
205 | goto inhdr_error; | |
206 | ||
207 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
208 | goto inhdr_error; | |
209 | ||
210 | iph = ip_hdr(skb); | |
211 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
212 | goto inhdr_error; | |
213 | ||
214 | len = ntohs(iph->tot_len); | |
215 | if (skb->len < len) { | |
216 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
217 | goto drop; | |
218 | } else if (len < (iph->ihl*4)) | |
219 | goto inhdr_error; | |
220 | ||
221 | if (pskb_trim_rcsum(skb, len)) { | |
222 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
223 | goto drop; | |
224 | } | |
225 | ||
f8e9881c | 226 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
7677e868 HX |
227 | /* We should really parse IP options here but until |
228 | * somebody who actually uses IP options complains to | |
229 | * us we'll just silently ignore the options because | |
230 | * we're lazy! | |
231 | */ | |
462fb2af BD |
232 | return 0; |
233 | ||
234 | inhdr_error: | |
235 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
236 | drop: | |
237 | return -1; | |
238 | } | |
239 | ||
230ac490 | 240 | void nf_bridge_update_protocol(struct sk_buff *skb) |
4a9d2f20 | 241 | { |
3eaf4025 FW |
242 | switch (skb->nf_bridge->orig_proto) { |
243 | case BRNF_PROTO_8021Q: | |
4a9d2f20 | 244 | skb->protocol = htons(ETH_P_8021Q); |
3eaf4025 FW |
245 | break; |
246 | case BRNF_PROTO_PPPOE: | |
4a9d2f20 | 247 | skb->protocol = htons(ETH_P_PPP_SES); |
3eaf4025 FW |
248 | break; |
249 | case BRNF_PROTO_UNCHANGED: | |
250 | break; | |
251 | } | |
4a9d2f20 FW |
252 | } |
253 | ||
e179e632 BDS |
254 | /* Obtain the correct destination MAC address, while preserving the original |
255 | * source MAC address. If we already know this address, we just copy it. If we | |
256 | * don't, we use the neighbour framework to find out. In both cases, we make | |
257 | * sure that br_handle_frame_finish() is called afterwards. | |
258 | */ | |
230ac490 | 259 | int br_nf_pre_routing_finish_bridge(struct sock *sk, struct sk_buff *skb) |
e179e632 | 260 | { |
f6b72b62 | 261 | struct neighbour *neigh; |
e179e632 BDS |
262 | struct dst_entry *dst; |
263 | ||
264 | skb->dev = bridge_parent(skb->dev); | |
265 | if (!skb->dev) | |
266 | goto free_skb; | |
267 | dst = skb_dst(skb); | |
f9d75166 DM |
268 | neigh = dst_neigh_lookup_skb(dst, skb); |
269 | if (neigh) { | |
38330783 | 270 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
f9d75166 DM |
271 | int ret; |
272 | ||
273 | if (neigh->hh.hh_len) { | |
274 | neigh_hh_bridge(&neigh->hh, skb); | |
275 | skb->dev = nf_bridge->physindev; | |
7026b1dd | 276 | ret = br_handle_frame_finish(sk, skb); |
f9d75166 DM |
277 | } else { |
278 | /* the neighbour function below overwrites the complete | |
279 | * MAC header, so we save the Ethernet source address and | |
280 | * protocol number. | |
281 | */ | |
282 | skb_copy_from_linear_data_offset(skb, | |
283 | -(ETH_HLEN-ETH_ALEN), | |
e70deecb | 284 | nf_bridge->neigh_header, |
f9d75166 DM |
285 | ETH_HLEN-ETH_ALEN); |
286 | /* tell br_dev_xmit to continue with forwarding */ | |
72b1e5e4 | 287 | nf_bridge->bridged_dnat = 1; |
93fdd47e | 288 | /* FIXME Need to refragment */ |
f9d75166 DM |
289 | ret = neigh->output(neigh, skb); |
290 | } | |
291 | neigh_release(neigh); | |
292 | return ret; | |
e179e632 BDS |
293 | } |
294 | free_skb: | |
295 | kfree_skb(skb); | |
296 | return 0; | |
297 | } | |
298 | ||
230ac490 PNA |
299 | static inline bool |
300 | br_nf_ipv4_daddr_was_changed(const struct sk_buff *skb, | |
301 | const struct nf_bridge_info *nf_bridge) | |
8cae308d | 302 | { |
230ac490 | 303 | return ip_hdr(skb)->daddr != nf_bridge->ipv4_daddr; |
8cae308d BT |
304 | } |
305 | ||
1da177e4 | 306 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 307 | * we will need to fix up the destination Ethernet address. |
faecbb45 | 308 | * This is also true when SNAT takes place (for the reply direction). |
1da177e4 LT |
309 | * |
310 | * There are two cases to consider: | |
311 | * 1. The packet was DNAT'ed to a device in the same bridge | |
312 | * port group as it was received on. We can still bridge | |
313 | * the packet. | |
314 | * 2. The packet was DNAT'ed to a different device, either | |
315 | * a non-bridged device or another bridge port group. | |
316 | * The packet will need to be routed. | |
317 | * | |
318 | * The correct way of distinguishing between these two cases is to | |
319 | * call ip_route_input() and to look at skb->dst->dev, which is | |
320 | * changed to the destination device if ip_route_input() succeeds. | |
321 | * | |
ea2d9b41 | 322 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 323 | * |
ea2d9b41 BDS |
324 | * If the output device equals the logical bridge device the packet |
325 | * came in on, we can consider this bridging. The corresponding MAC | |
326 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
327 | * Otherwise, the packet is considered to be routed and we just |
328 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
329 | * later be passed up to the IP stack to be routed. For a redirected |
330 | * packet, ip_route_input() will give back the localhost as output device, | |
331 | * which differs from the bridge device. | |
1da177e4 | 332 | * |
ea2d9b41 | 333 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 334 | * |
f216f082 BDS |
335 | * This can be because the destination address is martian, in which case |
336 | * the packet will be dropped. | |
ea2d9b41 BDS |
337 | * If IP forwarding is disabled, ip_route_input() will fail, while |
338 | * ip_route_output_key() can return success. The source | |
339 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 340 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
341 | * if IP forwarding is enabled. If the output device equals the logical bridge |
342 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
343 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
344 | */ | |
7026b1dd | 345 | static int br_nf_pre_routing_finish(struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
346 | { |
347 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 348 | struct iphdr *iph = ip_hdr(skb); |
f2d74cf8 | 349 | struct net *net = dev_net(dev); |
38330783 | 350 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
511c3f92 | 351 | struct rtable *rt; |
f216f082 | 352 | int err; |
93fdd47e | 353 | |
411ffb4f | 354 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; |
1da177e4 | 355 | |
a1e67951 | 356 | if (nf_bridge->pkt_otherhost) { |
1da177e4 | 357 | skb->pkt_type = PACKET_OTHERHOST; |
a1e67951 | 358 | nf_bridge->pkt_otherhost = false; |
1da177e4 | 359 | } |
72b1e5e4 | 360 | nf_bridge->in_prerouting = 0; |
230ac490 | 361 | if (br_nf_ipv4_daddr_was_changed(skb, nf_bridge)) { |
f216f082 | 362 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 363 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
364 | |
365 | /* If err equals -EHOSTUNREACH the error is due to a | |
366 | * martian destination or due to the fact that | |
367 | * forwarding is disabled. For most martian packets, | |
368 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
369 | * martian destinations: loopback destinations and destination | |
370 | * 0.0.0.0. In both cases the packet will be dropped because the | |
371 | * destination is the loopback device and not the bridge. */ | |
372 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
373 | goto free_skb; | |
1da177e4 | 374 | |
f2d74cf8 | 375 | rt = ip_route_output(net, iph->daddr, 0, |
78fbfd8a | 376 | RT_TOS(iph->tos), 0); |
b23dd4fe | 377 | if (!IS_ERR(rt)) { |
1c011bed | 378 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 379 | * require ip_forwarding. */ |
b23dd4fe DM |
380 | if (rt->dst.dev == dev) { |
381 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
382 | goto bridged_dnat; |
383 | } | |
b23dd4fe | 384 | ip_rt_put(rt); |
1da177e4 | 385 | } |
f216f082 | 386 | free_skb: |
1da177e4 LT |
387 | kfree_skb(skb); |
388 | return 0; | |
389 | } else { | |
adf30907 | 390 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 391 | bridged_dnat: |
1da177e4 | 392 | skb->dev = nf_bridge->physindev; |
e179e632 | 393 | nf_bridge_update_protocol(skb); |
fc38582d | 394 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
395 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
396 | NF_BR_PRE_ROUTING, | |
29a26a56 | 397 | net, sk, skb, skb->dev, NULL, |
1da177e4 LT |
398 | br_nf_pre_routing_finish_bridge, |
399 | 1); | |
400 | return 0; | |
401 | } | |
04091142 | 402 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
1da177e4 LT |
403 | skb->pkt_type = PACKET_HOST; |
404 | } | |
405 | } else { | |
511c3f92 ED |
406 | rt = bridge_parent_rtable(nf_bridge->physindev); |
407 | if (!rt) { | |
4adf0af6 SW |
408 | kfree_skb(skb); |
409 | return 0; | |
410 | } | |
f9181f4f | 411 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
412 | } |
413 | ||
414 | skb->dev = nf_bridge->physindev; | |
e179e632 | 415 | nf_bridge_update_protocol(skb); |
fc38582d | 416 | nf_bridge_push_encap_header(skb); |
29a26a56 | 417 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, net, sk, skb, |
7026b1dd | 418 | skb->dev, NULL, |
1da177e4 LT |
419 | br_handle_frame_finish, 1); |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
4981682c PNA |
424 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
425 | { | |
426 | struct net_device *vlan, *br; | |
427 | ||
428 | br = bridge_parent(dev); | |
df8a39de | 429 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) |
4981682c PNA |
430 | return br; |
431 | ||
f06c7f9f | 432 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
df8a39de | 433 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); |
4981682c PNA |
434 | |
435 | return vlan ? vlan : br; | |
436 | } | |
437 | ||
1da177e4 | 438 | /* Some common code for IPv4/IPv6 */ |
230ac490 | 439 | struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 | 440 | { |
38330783 | 441 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
1da177e4 LT |
442 | |
443 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
444 | skb->pkt_type = PACKET_HOST; | |
a1e67951 | 445 | nf_bridge->pkt_otherhost = true; |
1da177e4 LT |
446 | } |
447 | ||
72b1e5e4 | 448 | nf_bridge->in_prerouting = 1; |
1da177e4 | 449 | nf_bridge->physindev = skb->dev; |
4981682c | 450 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
3eaf4025 | 451 | |
e179e632 | 452 | if (skb->protocol == htons(ETH_P_8021Q)) |
3eaf4025 | 453 | nf_bridge->orig_proto = BRNF_PROTO_8021Q; |
e179e632 | 454 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
3eaf4025 | 455 | nf_bridge->orig_proto = BRNF_PROTO_PPPOE; |
5dce971a | 456 | |
6b8dbcf2 FW |
457 | /* Must drop socket now because of tproxy. */ |
458 | skb_orphan(skb); | |
5dce971a | 459 | return skb->dev; |
1da177e4 LT |
460 | } |
461 | ||
1da177e4 LT |
462 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. |
463 | * Replicate the checks that IPv4 does on packet reception. | |
464 | * Set skb->dev to the bridge device (i.e. parent of the | |
465 | * receiving device) to make netfilter happy, the REDIRECT | |
466 | * target in particular. Save the original destination IP | |
467 | * address to be able to detect DNAT afterwards. */ | |
795aa6ef PM |
468 | static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops, |
469 | struct sk_buff *skb, | |
238e54c9 | 470 | const struct nf_hook_state *state) |
1da177e4 | 471 | { |
faecbb45 | 472 | struct nf_bridge_info *nf_bridge; |
4df53d8b PM |
473 | struct net_bridge_port *p; |
474 | struct net_bridge *br; | |
e7c243c9 EP |
475 | __u32 len = nf_bridge_encap_header_len(skb); |
476 | ||
e7c243c9 | 477 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 478 | return NF_DROP; |
1da177e4 | 479 | |
238e54c9 | 480 | p = br_port_get_rcu(state->in); |
4df53d8b | 481 | if (p == NULL) |
deef4b52 | 482 | return NF_DROP; |
4df53d8b PM |
483 | br = p->br; |
484 | ||
739e4505 | 485 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
4df53d8b | 486 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 487 | return NF_ACCEPT; |
4df53d8b | 488 | |
fc38582d | 489 | nf_bridge_pull_encap_header_rcsum(skb); |
238e54c9 | 490 | return br_nf_pre_routing_ipv6(ops, skb, state); |
1da177e4 | 491 | } |
4df53d8b PM |
492 | |
493 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 494 | return NF_ACCEPT; |
1da177e4 | 495 | |
739e4505 | 496 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
1da177e4 LT |
497 | return NF_ACCEPT; |
498 | ||
fc38582d | 499 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 500 | |
77d574e7 | 501 | if (br_validate_ipv4(skb)) |
deef4b52 | 502 | return NF_DROP; |
17762060 | 503 | |
789bc3e5 | 504 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 505 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 506 | return NF_DROP; |
5dce971a SH |
507 | if (!setup_pre_routing(skb)) |
508 | return NF_DROP; | |
c055d5b0 | 509 | |
faecbb45 FW |
510 | nf_bridge = nf_bridge_info_get(skb); |
511 | nf_bridge->ipv4_daddr = ip_hdr(skb)->daddr; | |
512 | ||
e179e632 | 513 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 514 | |
29a26a56 | 515 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, state->net, state->sk, skb, |
7026b1dd | 516 | skb->dev, NULL, |
1da177e4 LT |
517 | br_nf_pre_routing_finish); |
518 | ||
519 | return NF_STOLEN; | |
1da177e4 LT |
520 | } |
521 | ||
522 | ||
523 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
524 | /* The packet is locally destined, which requires a real | |
525 | * dst_entry, so detach the fake one. On the way up, the | |
526 | * packet would pass through PRE_ROUTING again (which already | |
527 | * took place when the packet entered the bridge), but we | |
528 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
529 | * prevent this from happening. */ | |
795aa6ef PM |
530 | static unsigned int br_nf_local_in(const struct nf_hook_ops *ops, |
531 | struct sk_buff *skb, | |
238e54c9 | 532 | const struct nf_hook_state *state) |
1da177e4 | 533 | { |
a881e963 | 534 | br_drop_fake_rtable(skb); |
1da177e4 LT |
535 | return NF_ACCEPT; |
536 | } | |
537 | ||
1da177e4 | 538 | /* PF_BRIDGE/FORWARD *************************************************/ |
7026b1dd | 539 | static int br_nf_forward_finish(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 540 | { |
38330783 | 541 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
29a26a56 | 542 | struct net *net = dev_net(skb->dev); |
1da177e4 | 543 | struct net_device *in; |
1da177e4 | 544 | |
739e4505 | 545 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
0b67c43c | 546 | |
efb6de9b | 547 | if (skb->protocol == htons(ETH_P_IP)) |
411ffb4f | 548 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; |
efb6de9b BT |
549 | |
550 | if (skb->protocol == htons(ETH_P_IPV6)) | |
551 | nf_bridge->frag_max_size = IP6CB(skb)->frag_max_size; | |
0b67c43c | 552 | |
1da177e4 | 553 | in = nf_bridge->physindev; |
a1e67951 | 554 | if (nf_bridge->pkt_otherhost) { |
1da177e4 | 555 | skb->pkt_type = PACKET_OTHERHOST; |
a1e67951 | 556 | nf_bridge->pkt_otherhost = false; |
1da177e4 | 557 | } |
e94c6743 | 558 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
559 | } else { |
560 | in = *((struct net_device **)(skb->cb)); | |
561 | } | |
fc38582d | 562 | nf_bridge_push_encap_header(skb); |
e179e632 | 563 | |
29a26a56 | 564 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, net, sk, skb, |
7026b1dd | 565 | in, skb->dev, br_forward_finish, 1); |
1da177e4 LT |
566 | return 0; |
567 | } | |
568 | ||
739e4505 | 569 | |
1da177e4 LT |
570 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
571 | * netfilter with indev and outdev set to the bridge device, | |
572 | * but we are still able to filter on the 'real' indev/outdev | |
573 | * because of the physdev module. For ARP, indev and outdev are the | |
574 | * bridge ports. */ | |
795aa6ef PM |
575 | static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops, |
576 | struct sk_buff *skb, | |
238e54c9 | 577 | const struct nf_hook_state *state) |
1da177e4 | 578 | { |
1da177e4 | 579 | struct nf_bridge_info *nf_bridge; |
5dce971a | 580 | struct net_device *parent; |
76108cea | 581 | u_int8_t pf; |
1da177e4 LT |
582 | |
583 | if (!skb->nf_bridge) | |
584 | return NF_ACCEPT; | |
585 | ||
2dc2f207 PM |
586 | /* Need exclusive nf_bridge_info since we might have multiple |
587 | * different physoutdevs. */ | |
588 | if (!nf_bridge_unshare(skb)) | |
589 | return NF_DROP; | |
590 | ||
38330783 FW |
591 | nf_bridge = nf_bridge_info_get(skb); |
592 | if (!nf_bridge) | |
593 | return NF_DROP; | |
594 | ||
238e54c9 | 595 | parent = bridge_parent(state->out); |
5dce971a SH |
596 | if (!parent) |
597 | return NF_DROP; | |
598 | ||
739e4505 | 599 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 600 | pf = NFPROTO_IPV4; |
739e4505 | 601 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 602 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
603 | else |
604 | return NF_ACCEPT; | |
1da177e4 | 605 | |
3db05fea | 606 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 607 | |
1da177e4 LT |
608 | if (skb->pkt_type == PACKET_OTHERHOST) { |
609 | skb->pkt_type = PACKET_HOST; | |
a1e67951 | 610 | nf_bridge->pkt_otherhost = true; |
1da177e4 LT |
611 | } |
612 | ||
0b67c43c | 613 | if (pf == NFPROTO_IPV4) { |
77d574e7 | 614 | if (br_validate_ipv4(skb)) |
0b67c43c | 615 | return NF_DROP; |
411ffb4f | 616 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; |
0b67c43c | 617 | } |
6b1e960f | 618 | |
efb6de9b BT |
619 | if (pf == NFPROTO_IPV6) { |
620 | if (br_validate_ipv6(skb)) | |
621 | return NF_DROP; | |
622 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
623 | } | |
624 | ||
1da177e4 | 625 | nf_bridge->physoutdev = skb->dev; |
aa740f46 | 626 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
627 | skb->protocol = htons(ETH_P_IP); |
628 | else | |
629 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 630 | |
29a26a56 | 631 | NF_HOOK(pf, NF_INET_FORWARD, state->net, NULL, skb, |
7026b1dd | 632 | brnf_get_logical_dev(skb, state->in), |
238e54c9 | 633 | parent, br_nf_forward_finish); |
1da177e4 LT |
634 | |
635 | return NF_STOLEN; | |
636 | } | |
637 | ||
795aa6ef PM |
638 | static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, |
639 | struct sk_buff *skb, | |
238e54c9 | 640 | const struct nf_hook_state *state) |
1da177e4 | 641 | { |
4df53d8b PM |
642 | struct net_bridge_port *p; |
643 | struct net_bridge *br; | |
1da177e4 LT |
644 | struct net_device **d = (struct net_device **)(skb->cb); |
645 | ||
238e54c9 | 646 | p = br_port_get_rcu(state->out); |
4df53d8b PM |
647 | if (p == NULL) |
648 | return NF_ACCEPT; | |
649 | br = p->br; | |
650 | ||
651 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 652 | return NF_ACCEPT; |
1da177e4 | 653 | |
739e4505 | 654 | if (!IS_ARP(skb)) { |
8b42ec39 | 655 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 656 | return NF_ACCEPT; |
3db05fea | 657 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
658 | } |
659 | ||
d0a92be0 | 660 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 661 | if (IS_VLAN_ARP(skb)) |
3db05fea | 662 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
663 | return NF_ACCEPT; |
664 | } | |
238e54c9 | 665 | *d = state->in; |
29a26a56 | 666 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, state->net, state->sk, skb, |
7026b1dd | 667 | state->in, state->out, br_nf_forward_finish); |
1da177e4 LT |
668 | |
669 | return NF_STOLEN; | |
670 | } | |
671 | ||
efb6de9b | 672 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) || IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
6532948b | 673 | static int br_nf_push_frag_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
8bd63cf1 | 674 | { |
e70deecb | 675 | struct brnf_frag_data *data; |
8bd63cf1 | 676 | int err; |
8bd63cf1 | 677 | |
e70deecb FW |
678 | data = this_cpu_ptr(&brnf_frag_data_storage); |
679 | err = skb_cow_head(skb, data->size); | |
8bd63cf1 | 680 | |
e70deecb | 681 | if (err) { |
8bd63cf1 FW |
682 | kfree_skb(skb); |
683 | return 0; | |
684 | } | |
685 | ||
d7b59742 FW |
686 | if (data->vlan_tci) { |
687 | skb->vlan_tci = data->vlan_tci; | |
688 | skb->vlan_proto = data->vlan_proto; | |
689 | } | |
690 | ||
e70deecb FW |
691 | skb_copy_to_linear_data_offset(skb, -data->size, data->mac, data->size); |
692 | __skb_push(skb, data->encap_size); | |
693 | ||
a9fcc6a4 | 694 | nf_bridge_info_free(skb); |
7026b1dd | 695 | return br_dev_queue_push_xmit(sk, skb); |
8bd63cf1 | 696 | } |
6532948b EB |
697 | static int br_nf_push_frag_xmit_sk(struct sock *sk, struct sk_buff *skb) |
698 | { | |
699 | struct net *net = dev_net(skb_dst(skb)->dev); | |
700 | return br_nf_push_frag_xmit(net, sk, skb); | |
701 | } | |
efb6de9b | 702 | #endif |
8bd63cf1 | 703 | |
a1bc1b35 | 704 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
8d4df0b9 EB |
705 | static int |
706 | br_nf_ip_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, | |
707 | int (*output)(struct sock *, struct sk_buff *)) | |
49d16b23 AZ |
708 | { |
709 | unsigned int mtu = ip_skb_dst_mtu(skb); | |
710 | struct iphdr *iph = ip_hdr(skb); | |
49d16b23 AZ |
711 | |
712 | if (unlikely(((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) || | |
713 | (IPCB(skb)->frag_max_size && | |
714 | IPCB(skb)->frag_max_size > mtu))) { | |
8d4df0b9 | 715 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); |
49d16b23 AZ |
716 | kfree_skb(skb); |
717 | return -EMSGSIZE; | |
718 | } | |
719 | ||
720 | return ip_do_fragment(sk, skb, output); | |
721 | } | |
a1bc1b35 | 722 | #endif |
49d16b23 | 723 | |
33b1f313 FW |
724 | static unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb) |
725 | { | |
726 | if (skb->nf_bridge->orig_proto == BRNF_PROTO_PPPOE) | |
727 | return PPPOE_SES_HLEN; | |
728 | return 0; | |
729 | } | |
730 | ||
7026b1dd | 731 | static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb) |
2e2f7aef | 732 | { |
411ffb4f | 733 | struct nf_bridge_info *nf_bridge; |
7a8d831d | 734 | unsigned int mtu_reserved; |
8d4df0b9 | 735 | struct net *net = dev_net(skb_dst(skb)->dev); |
462fb2af | 736 | |
efb6de9b BT |
737 | mtu_reserved = nf_bridge_mtu_reduction(skb); |
738 | ||
739 | if (skb_is_gso(skb) || skb->len + mtu_reserved <= skb->dev->mtu) { | |
a9fcc6a4 | 740 | nf_bridge_info_free(skb); |
7026b1dd | 741 | return br_dev_queue_push_xmit(sk, skb); |
a9fcc6a4 | 742 | } |
7a8d831d | 743 | |
411ffb4f | 744 | nf_bridge = nf_bridge_info_get(skb); |
efb6de9b BT |
745 | |
746 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) | |
93fdd47e HX |
747 | /* This is wrong! We should preserve the original fragment |
748 | * boundaries by preserving frag_list rather than refragmenting. | |
749 | */ | |
efb6de9b | 750 | if (skb->protocol == htons(ETH_P_IP)) { |
e70deecb FW |
751 | struct brnf_frag_data *data; |
752 | ||
77d574e7 | 753 | if (br_validate_ipv4(skb)) |
dd302b59 | 754 | goto drop; |
411ffb4f BT |
755 | |
756 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
e70deecb FW |
757 | |
758 | nf_bridge_update_protocol(skb); | |
759 | ||
760 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
d7b59742 FW |
761 | |
762 | data->vlan_tci = skb->vlan_tci; | |
763 | data->vlan_proto = skb->vlan_proto; | |
e70deecb FW |
764 | data->encap_size = nf_bridge_encap_header_len(skb); |
765 | data->size = ETH_HLEN + data->encap_size; | |
766 | ||
767 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, | |
768 | data->size); | |
769 | ||
6532948b | 770 | return br_nf_ip_fragment(net, sk, skb, br_nf_push_frag_xmit_sk); |
e70deecb | 771 | } |
efb6de9b BT |
772 | #endif |
773 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) | |
774 | if (skb->protocol == htons(ETH_P_IPV6)) { | |
775 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); | |
776 | struct brnf_frag_data *data; | |
462fb2af | 777 | |
efb6de9b | 778 | if (br_validate_ipv6(skb)) |
dd302b59 | 779 | goto drop; |
efb6de9b BT |
780 | |
781 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
782 | ||
783 | nf_bridge_update_protocol(skb); | |
784 | ||
785 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
786 | data->encap_size = nf_bridge_encap_header_len(skb); | |
787 | data->size = ETH_HLEN + data->encap_size; | |
788 | ||
789 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, | |
790 | data->size); | |
791 | ||
792 | if (v6ops) | |
6532948b | 793 | return v6ops->fragment(sk, skb, br_nf_push_frag_xmit_sk); |
dd302b59 FW |
794 | |
795 | kfree_skb(skb); | |
796 | return -EMSGSIZE; | |
efb6de9b BT |
797 | } |
798 | #endif | |
a9fcc6a4 FW |
799 | nf_bridge_info_free(skb); |
800 | return br_dev_queue_push_xmit(sk, skb); | |
dd302b59 FW |
801 | drop: |
802 | kfree_skb(skb); | |
803 | return 0; | |
c197facc | 804 | } |
1da177e4 LT |
805 | |
806 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
795aa6ef PM |
807 | static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops, |
808 | struct sk_buff *skb, | |
238e54c9 | 809 | const struct nf_hook_state *state) |
1da177e4 | 810 | { |
38330783 | 811 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
1da177e4 | 812 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 813 | u_int8_t pf; |
1da177e4 | 814 | |
e4bb9bcb FW |
815 | /* if nf_bridge is set, but ->physoutdev is NULL, this packet came in |
816 | * on a bridge, but was delivered locally and is now being routed: | |
817 | * | |
818 | * POST_ROUTING was already invoked from the ip stack. | |
819 | */ | |
820 | if (!nf_bridge || !nf_bridge->physoutdev) | |
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; | |
a1e67951 | 837 | nf_bridge->pkt_otherhost = true; |
1da177e4 LT |
838 | } |
839 | ||
fc38582d | 840 | nf_bridge_pull_encap_header(skb); |
aa740f46 | 841 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
842 | skb->protocol = htons(ETH_P_IP); |
843 | else | |
844 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 845 | |
29a26a56 | 846 | NF_HOOK(pf, NF_INET_POST_ROUTING, state->net, state->sk, skb, |
7026b1dd | 847 | 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, | |
238e54c9 | 858 | const struct nf_hook_state *state) |
1da177e4 | 859 | { |
72b1e5e4 | 860 | if (skb->nf_bridge && !skb->nf_bridge->in_prerouting) |
1da177e4 | 861 | return NF_STOP; |
1da177e4 LT |
862 | |
863 | return NF_ACCEPT; | |
864 | } | |
865 | ||
e5de75bf PNA |
866 | /* This is called when br_netfilter has called into iptables/netfilter, |
867 | * and DNAT has taken place on a bridge-forwarded packet. | |
868 | * | |
869 | * neigh->output has created a new MAC header, with local br0 MAC | |
870 | * as saddr. | |
871 | * | |
872 | * This restores the original MAC saddr of the bridged packet | |
873 | * before invoking bridge forward logic to transmit the packet. | |
874 | */ | |
875 | static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) | |
876 | { | |
38330783 | 877 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
e5de75bf PNA |
878 | |
879 | skb_pull(skb, ETH_HLEN); | |
72b1e5e4 | 880 | nf_bridge->bridged_dnat = 0; |
e5de75bf | 881 | |
e70deecb FW |
882 | BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN)); |
883 | ||
884 | skb_copy_to_linear_data_offset(skb, -(ETH_HLEN - ETH_ALEN), | |
885 | nf_bridge->neigh_header, | |
886 | ETH_HLEN - ETH_ALEN); | |
e5de75bf | 887 | skb->dev = nf_bridge->physindev; |
7fb48c5b FW |
888 | |
889 | nf_bridge->physoutdev = NULL; | |
7026b1dd | 890 | br_handle_frame_finish(NULL, skb); |
e5de75bf PNA |
891 | } |
892 | ||
1a4ba64d | 893 | static int br_nf_dev_xmit(struct sk_buff *skb) |
e5de75bf | 894 | { |
72b1e5e4 | 895 | if (skb->nf_bridge && skb->nf_bridge->bridged_dnat) { |
e5de75bf PNA |
896 | br_nf_pre_routing_finish_bridge_slow(skb); |
897 | return 1; | |
898 | } | |
899 | return 0; | |
900 | } | |
1a4ba64d PNA |
901 | |
902 | static const struct nf_br_ops br_ops = { | |
903 | .br_dev_xmit_hook = br_nf_dev_xmit, | |
904 | }; | |
e5de75bf | 905 | |
4b7fd5d9 PNA |
906 | void br_netfilter_enable(void) |
907 | { | |
908 | } | |
909 | EXPORT_SYMBOL_GPL(br_netfilter_enable); | |
910 | ||
ea2d9b41 BDS |
911 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
912 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 913 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
914 | { |
915 | .hook = br_nf_pre_routing, | |
916 | .owner = THIS_MODULE, | |
aa740f46 | 917 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
918 | .hooknum = NF_BR_PRE_ROUTING, |
919 | .priority = NF_BR_PRI_BRNF, | |
920 | }, | |
921 | { | |
922 | .hook = br_nf_local_in, | |
923 | .owner = THIS_MODULE, | |
aa740f46 | 924 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
925 | .hooknum = NF_BR_LOCAL_IN, |
926 | .priority = NF_BR_PRI_BRNF, | |
927 | }, | |
928 | { | |
929 | .hook = br_nf_forward_ip, | |
930 | .owner = THIS_MODULE, | |
aa740f46 | 931 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
932 | .hooknum = NF_BR_FORWARD, |
933 | .priority = NF_BR_PRI_BRNF - 1, | |
934 | }, | |
935 | { | |
936 | .hook = br_nf_forward_arp, | |
937 | .owner = THIS_MODULE, | |
aa740f46 | 938 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
939 | .hooknum = NF_BR_FORWARD, |
940 | .priority = NF_BR_PRI_BRNF, | |
941 | }, | |
1490fd89 CG |
942 | { |
943 | .hook = br_nf_post_routing, | |
944 | .owner = THIS_MODULE, | |
aa740f46 | 945 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
946 | .hooknum = NF_BR_POST_ROUTING, |
947 | .priority = NF_BR_PRI_LAST, | |
948 | }, | |
949 | { | |
950 | .hook = ip_sabotage_in, | |
951 | .owner = THIS_MODULE, | |
aa740f46 | 952 | .pf = NFPROTO_IPV4, |
1490fd89 CG |
953 | .hooknum = NF_INET_PRE_ROUTING, |
954 | .priority = NF_IP_PRI_FIRST, | |
955 | }, | |
956 | { | |
957 | .hook = ip_sabotage_in, | |
958 | .owner = THIS_MODULE, | |
aa740f46 | 959 | .pf = NFPROTO_IPV6, |
1490fd89 CG |
960 | .hooknum = NF_INET_PRE_ROUTING, |
961 | .priority = NF_IP6_PRI_FIRST, | |
962 | }, | |
1da177e4 LT |
963 | }; |
964 | ||
965 | #ifdef CONFIG_SYSCTL | |
966 | static | |
fe2c6338 | 967 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
56b148eb | 968 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
969 | { |
970 | int ret; | |
971 | ||
8d65af78 | 972 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
973 | |
974 | if (write && *(int *)(ctl->data)) | |
975 | *(int *)(ctl->data) = 1; | |
976 | return ret; | |
977 | } | |
978 | ||
fe2c6338 | 979 | static struct ctl_table brnf_table[] = { |
1da177e4 | 980 | { |
1da177e4 LT |
981 | .procname = "bridge-nf-call-arptables", |
982 | .data = &brnf_call_arptables, | |
983 | .maxlen = sizeof(int), | |
984 | .mode = 0644, | |
6d9f239a | 985 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
986 | }, |
987 | { | |
1da177e4 LT |
988 | .procname = "bridge-nf-call-iptables", |
989 | .data = &brnf_call_iptables, | |
990 | .maxlen = sizeof(int), | |
991 | .mode = 0644, | |
6d9f239a | 992 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
993 | }, |
994 | { | |
1da177e4 LT |
995 | .procname = "bridge-nf-call-ip6tables", |
996 | .data = &brnf_call_ip6tables, | |
997 | .maxlen = sizeof(int), | |
998 | .mode = 0644, | |
6d9f239a | 999 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
1000 | }, |
1001 | { | |
1da177e4 LT |
1002 | .procname = "bridge-nf-filter-vlan-tagged", |
1003 | .data = &brnf_filter_vlan_tagged, | |
1004 | .maxlen = sizeof(int), | |
1005 | .mode = 0644, | |
6d9f239a | 1006 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
1007 | }, |
1008 | { | |
516299d2 MM |
1009 | .procname = "bridge-nf-filter-pppoe-tagged", |
1010 | .data = &brnf_filter_pppoe_tagged, | |
1011 | .maxlen = sizeof(int), | |
1012 | .mode = 0644, | |
6d9f239a | 1013 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 1014 | }, |
4981682c PNA |
1015 | { |
1016 | .procname = "bridge-nf-pass-vlan-input-dev", | |
1017 | .data = &brnf_pass_vlan_indev, | |
1018 | .maxlen = sizeof(int), | |
1019 | .mode = 0644, | |
1020 | .proc_handler = brnf_sysctl_call_tables, | |
1021 | }, | |
f8572d8f | 1022 | { } |
1da177e4 | 1023 | }; |
1da177e4 LT |
1024 | #endif |
1025 | ||
34666d46 | 1026 | static int __init br_netfilter_init(void) |
1da177e4 | 1027 | { |
5eb87f45 | 1028 | int ret; |
1da177e4 | 1029 | |
34666d46 | 1030 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
5eb87f45 | 1031 | if (ret < 0) |
1da177e4 | 1032 | return ret; |
fc66f95c | 1033 | |
1da177e4 | 1034 | #ifdef CONFIG_SYSCTL |
ec8f23ce | 1035 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
1da177e4 | 1036 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1037 | printk(KERN_WARNING |
1038 | "br_netfilter: can't register to sysctl.\n"); | |
96727239 GU |
1039 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1040 | return -ENOMEM; | |
1da177e4 LT |
1041 | } |
1042 | #endif | |
1a4ba64d | 1043 | RCU_INIT_POINTER(nf_br_ops, &br_ops); |
1da177e4 | 1044 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1045 | return 0; |
1046 | } | |
1047 | ||
34666d46 | 1048 | static void __exit br_netfilter_fini(void) |
1da177e4 | 1049 | { |
1a4ba64d | 1050 | RCU_INIT_POINTER(nf_br_ops, NULL); |
5eb87f45 | 1051 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 | 1052 | #ifdef CONFIG_SYSCTL |
5dd3df10 | 1053 | unregister_net_sysctl_table(brnf_sysctl_header); |
1da177e4 LT |
1054 | #endif |
1055 | } | |
34666d46 PNA |
1056 | |
1057 | module_init(br_netfilter_init); | |
1058 | module_exit(br_netfilter_fini); | |
1059 | ||
1060 | MODULE_LICENSE("GPL"); | |
1061 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); | |
1062 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); | |
1063 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |