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> | |
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 | ||
e70deecb FW |
114 | struct brnf_frag_data { |
115 | char mac[NF_BRIDGE_MAX_MAC_HEADER_LENGTH]; | |
116 | u8 encap_size; | |
117 | u8 size; | |
d7b59742 FW |
118 | u16 vlan_tci; |
119 | __be16 vlan_proto; | |
e70deecb FW |
120 | }; |
121 | ||
122 | static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage); | |
e70deecb | 123 | |
a9fcc6a4 FW |
124 | static void nf_bridge_info_free(struct sk_buff *skb) |
125 | { | |
126 | if (skb->nf_bridge) { | |
127 | nf_bridge_put(skb->nf_bridge); | |
128 | skb->nf_bridge = NULL; | |
129 | } | |
130 | } | |
131 | ||
5dce971a SH |
132 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
133 | { | |
b5ed54e9 | 134 | struct net_bridge_port *port; |
5dce971a | 135 | |
b5ed54e9 | 136 | port = br_port_get_rcu(dev); |
137 | return port ? port->br->dev : NULL; | |
5dce971a | 138 | } |
1da177e4 | 139 | |
2dc2f207 PM |
140 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
141 | { | |
142 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
143 | ||
144 | if (atomic_read(&nf_bridge->use) > 1) { | |
145 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
146 | ||
147 | if (tmp) { | |
148 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
149 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 150 | } |
4c3a76ab | 151 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
152 | nf_bridge = tmp; |
153 | } | |
154 | return nf_bridge; | |
155 | } | |
156 | ||
230ac490 | 157 | unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb) |
8d045163 FW |
158 | { |
159 | switch (skb->protocol) { | |
160 | case __cpu_to_be16(ETH_P_8021Q): | |
161 | return VLAN_HLEN; | |
162 | case __cpu_to_be16(ETH_P_PPP_SES): | |
163 | return PPPOE_SES_HLEN; | |
164 | default: | |
165 | return 0; | |
166 | } | |
167 | } | |
168 | ||
fc38582d | 169 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) |
fdeabdef | 170 | { |
fc38582d PM |
171 | unsigned int len = nf_bridge_encap_header_len(skb); |
172 | ||
173 | skb_pull(skb, len); | |
174 | skb->network_header += len; | |
175 | } | |
fdeabdef | 176 | |
fc38582d PM |
177 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
178 | { | |
179 | unsigned int len = nf_bridge_encap_header_len(skb); | |
180 | ||
181 | skb_pull_rcsum(skb, len); | |
182 | skb->network_header += len; | |
183 | } | |
184 | ||
462fb2af BD |
185 | /* When handing a packet over to the IP layer |
186 | * check whether we have a skb that is in the | |
187 | * expected format | |
188 | */ | |
189 | ||
c1444c63 | 190 | static int br_validate_ipv4(struct net *net, struct sk_buff *skb) |
462fb2af | 191 | { |
b71d1d42 | 192 | const struct iphdr *iph; |
462fb2af BD |
193 | u32 len; |
194 | ||
6caab7b0 SB |
195 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
196 | goto inhdr_error; | |
197 | ||
462fb2af | 198 | iph = ip_hdr(skb); |
462fb2af BD |
199 | |
200 | /* Basic sanity checks */ | |
201 | if (iph->ihl < 5 || iph->version != 4) | |
202 | goto inhdr_error; | |
203 | ||
204 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
205 | goto inhdr_error; | |
206 | ||
207 | iph = ip_hdr(skb); | |
208 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
209 | goto inhdr_error; | |
210 | ||
211 | len = ntohs(iph->tot_len); | |
212 | if (skb->len < len) { | |
c1444c63 | 213 | IP_INC_STATS_BH(net, IPSTATS_MIB_INTRUNCATEDPKTS); |
462fb2af BD |
214 | goto drop; |
215 | } else if (len < (iph->ihl*4)) | |
216 | goto inhdr_error; | |
217 | ||
218 | if (pskb_trim_rcsum(skb, len)) { | |
c1444c63 | 219 | IP_INC_STATS_BH(net, IPSTATS_MIB_INDISCARDS); |
462fb2af BD |
220 | goto drop; |
221 | } | |
222 | ||
f8e9881c | 223 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
7677e868 HX |
224 | /* We should really parse IP options here but until |
225 | * somebody who actually uses IP options complains to | |
226 | * us we'll just silently ignore the options because | |
227 | * we're lazy! | |
228 | */ | |
462fb2af BD |
229 | return 0; |
230 | ||
231 | inhdr_error: | |
c1444c63 | 232 | IP_INC_STATS_BH(net, IPSTATS_MIB_INHDRERRORS); |
462fb2af BD |
233 | drop: |
234 | return -1; | |
235 | } | |
236 | ||
230ac490 | 237 | void nf_bridge_update_protocol(struct sk_buff *skb) |
4a9d2f20 | 238 | { |
3eaf4025 FW |
239 | switch (skb->nf_bridge->orig_proto) { |
240 | case BRNF_PROTO_8021Q: | |
4a9d2f20 | 241 | skb->protocol = htons(ETH_P_8021Q); |
3eaf4025 FW |
242 | break; |
243 | case BRNF_PROTO_PPPOE: | |
4a9d2f20 | 244 | skb->protocol = htons(ETH_P_PPP_SES); |
3eaf4025 FW |
245 | break; |
246 | case BRNF_PROTO_UNCHANGED: | |
247 | break; | |
248 | } | |
4a9d2f20 FW |
249 | } |
250 | ||
e179e632 BDS |
251 | /* Obtain the correct destination MAC address, while preserving the original |
252 | * source MAC address. If we already know this address, we just copy it. If we | |
253 | * don't, we use the neighbour framework to find out. In both cases, we make | |
254 | * sure that br_handle_frame_finish() is called afterwards. | |
255 | */ | |
0c4b51f0 | 256 | int br_nf_pre_routing_finish_bridge(struct net *net, struct sock *sk, struct sk_buff *skb) |
e179e632 | 257 | { |
f6b72b62 | 258 | struct neighbour *neigh; |
e179e632 BDS |
259 | struct dst_entry *dst; |
260 | ||
261 | skb->dev = bridge_parent(skb->dev); | |
262 | if (!skb->dev) | |
263 | goto free_skb; | |
264 | dst = skb_dst(skb); | |
f9d75166 DM |
265 | neigh = dst_neigh_lookup_skb(dst, skb); |
266 | if (neigh) { | |
38330783 | 267 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
f9d75166 DM |
268 | int ret; |
269 | ||
270 | if (neigh->hh.hh_len) { | |
271 | neigh_hh_bridge(&neigh->hh, skb); | |
272 | skb->dev = nf_bridge->physindev; | |
0c4b51f0 | 273 | ret = br_handle_frame_finish(net, sk, skb); |
f9d75166 DM |
274 | } else { |
275 | /* the neighbour function below overwrites the complete | |
276 | * MAC header, so we save the Ethernet source address and | |
277 | * protocol number. | |
278 | */ | |
279 | skb_copy_from_linear_data_offset(skb, | |
280 | -(ETH_HLEN-ETH_ALEN), | |
e70deecb | 281 | nf_bridge->neigh_header, |
f9d75166 DM |
282 | ETH_HLEN-ETH_ALEN); |
283 | /* tell br_dev_xmit to continue with forwarding */ | |
72b1e5e4 | 284 | nf_bridge->bridged_dnat = 1; |
93fdd47e | 285 | /* FIXME Need to refragment */ |
f9d75166 DM |
286 | ret = neigh->output(neigh, skb); |
287 | } | |
288 | neigh_release(neigh); | |
289 | return ret; | |
e179e632 BDS |
290 | } |
291 | free_skb: | |
292 | kfree_skb(skb); | |
293 | return 0; | |
294 | } | |
295 | ||
230ac490 PNA |
296 | static inline bool |
297 | br_nf_ipv4_daddr_was_changed(const struct sk_buff *skb, | |
298 | const struct nf_bridge_info *nf_bridge) | |
8cae308d | 299 | { |
230ac490 | 300 | return ip_hdr(skb)->daddr != nf_bridge->ipv4_daddr; |
8cae308d BT |
301 | } |
302 | ||
1da177e4 | 303 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 304 | * we will need to fix up the destination Ethernet address. |
faecbb45 | 305 | * This is also true when SNAT takes place (for the reply direction). |
1da177e4 LT |
306 | * |
307 | * There are two cases to consider: | |
308 | * 1. The packet was DNAT'ed to a device in the same bridge | |
309 | * port group as it was received on. We can still bridge | |
310 | * the packet. | |
311 | * 2. The packet was DNAT'ed to a different device, either | |
312 | * a non-bridged device or another bridge port group. | |
313 | * The packet will need to be routed. | |
314 | * | |
315 | * The correct way of distinguishing between these two cases is to | |
316 | * call ip_route_input() and to look at skb->dst->dev, which is | |
317 | * changed to the destination device if ip_route_input() succeeds. | |
318 | * | |
ea2d9b41 | 319 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 320 | * |
ea2d9b41 BDS |
321 | * If the output device equals the logical bridge device the packet |
322 | * came in on, we can consider this bridging. The corresponding MAC | |
323 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
324 | * Otherwise, the packet is considered to be routed and we just |
325 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
326 | * later be passed up to the IP stack to be routed. For a redirected |
327 | * packet, ip_route_input() will give back the localhost as output device, | |
328 | * which differs from the bridge device. | |
1da177e4 | 329 | * |
ea2d9b41 | 330 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 331 | * |
f216f082 BDS |
332 | * This can be because the destination address is martian, in which case |
333 | * the packet will be dropped. | |
ea2d9b41 BDS |
334 | * If IP forwarding is disabled, ip_route_input() will fail, while |
335 | * ip_route_output_key() can return success. The source | |
336 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 337 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
338 | * if IP forwarding is enabled. If the output device equals the logical bridge |
339 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
340 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
341 | */ | |
0c4b51f0 | 342 | static int br_nf_pre_routing_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 LT |
343 | { |
344 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 345 | struct iphdr *iph = ip_hdr(skb); |
38330783 | 346 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
511c3f92 | 347 | struct rtable *rt; |
f216f082 | 348 | int err; |
93fdd47e | 349 | |
411ffb4f | 350 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; |
1da177e4 | 351 | |
a1e67951 | 352 | if (nf_bridge->pkt_otherhost) { |
1da177e4 | 353 | skb->pkt_type = PACKET_OTHERHOST; |
a1e67951 | 354 | nf_bridge->pkt_otherhost = false; |
1da177e4 | 355 | } |
72b1e5e4 | 356 | nf_bridge->in_prerouting = 0; |
230ac490 | 357 | if (br_nf_ipv4_daddr_was_changed(skb, nf_bridge)) { |
f216f082 | 358 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 359 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
360 | |
361 | /* If err equals -EHOSTUNREACH the error is due to a | |
362 | * martian destination or due to the fact that | |
363 | * forwarding is disabled. For most martian packets, | |
364 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
365 | * martian destinations: loopback destinations and destination | |
366 | * 0.0.0.0. In both cases the packet will be dropped because the | |
367 | * destination is the loopback device and not the bridge. */ | |
368 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
369 | goto free_skb; | |
1da177e4 | 370 | |
f2d74cf8 | 371 | rt = ip_route_output(net, iph->daddr, 0, |
78fbfd8a | 372 | RT_TOS(iph->tos), 0); |
b23dd4fe | 373 | if (!IS_ERR(rt)) { |
1c011bed | 374 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 375 | * require ip_forwarding. */ |
b23dd4fe DM |
376 | if (rt->dst.dev == dev) { |
377 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
378 | goto bridged_dnat; |
379 | } | |
b23dd4fe | 380 | ip_rt_put(rt); |
1da177e4 | 381 | } |
f216f082 | 382 | free_skb: |
1da177e4 LT |
383 | kfree_skb(skb); |
384 | return 0; | |
385 | } else { | |
adf30907 | 386 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 387 | bridged_dnat: |
1da177e4 | 388 | skb->dev = nf_bridge->physindev; |
e179e632 | 389 | nf_bridge_update_protocol(skb); |
fc38582d | 390 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
391 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
392 | NF_BR_PRE_ROUTING, | |
29a26a56 | 393 | net, sk, skb, skb->dev, NULL, |
1da177e4 LT |
394 | br_nf_pre_routing_finish_bridge, |
395 | 1); | |
396 | return 0; | |
397 | } | |
04091142 | 398 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
1da177e4 LT |
399 | skb->pkt_type = PACKET_HOST; |
400 | } | |
401 | } else { | |
511c3f92 ED |
402 | rt = bridge_parent_rtable(nf_bridge->physindev); |
403 | if (!rt) { | |
4adf0af6 SW |
404 | kfree_skb(skb); |
405 | return 0; | |
406 | } | |
f9181f4f | 407 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
408 | } |
409 | ||
410 | skb->dev = nf_bridge->physindev; | |
e179e632 | 411 | nf_bridge_update_protocol(skb); |
fc38582d | 412 | nf_bridge_push_encap_header(skb); |
29a26a56 | 413 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, net, sk, skb, |
7026b1dd | 414 | skb->dev, NULL, |
1da177e4 LT |
415 | br_handle_frame_finish, 1); |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
4981682c PNA |
420 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
421 | { | |
422 | struct net_device *vlan, *br; | |
423 | ||
424 | br = bridge_parent(dev); | |
df8a39de | 425 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) |
4981682c PNA |
426 | return br; |
427 | ||
f06c7f9f | 428 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
df8a39de | 429 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); |
4981682c PNA |
430 | |
431 | return vlan ? vlan : br; | |
432 | } | |
433 | ||
1da177e4 | 434 | /* Some common code for IPv4/IPv6 */ |
230ac490 | 435 | struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 | 436 | { |
38330783 | 437 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
1da177e4 LT |
438 | |
439 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
440 | skb->pkt_type = PACKET_HOST; | |
a1e67951 | 441 | nf_bridge->pkt_otherhost = true; |
1da177e4 LT |
442 | } |
443 | ||
72b1e5e4 | 444 | nf_bridge->in_prerouting = 1; |
1da177e4 | 445 | nf_bridge->physindev = skb->dev; |
4981682c | 446 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
3eaf4025 | 447 | |
e179e632 | 448 | if (skb->protocol == htons(ETH_P_8021Q)) |
3eaf4025 | 449 | nf_bridge->orig_proto = BRNF_PROTO_8021Q; |
e179e632 | 450 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
3eaf4025 | 451 | nf_bridge->orig_proto = BRNF_PROTO_PPPOE; |
5dce971a | 452 | |
6b8dbcf2 FW |
453 | /* Must drop socket now because of tproxy. */ |
454 | skb_orphan(skb); | |
5dce971a | 455 | return skb->dev; |
1da177e4 LT |
456 | } |
457 | ||
1da177e4 LT |
458 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. |
459 | * Replicate the checks that IPv4 does on packet reception. | |
460 | * Set skb->dev to the bridge device (i.e. parent of the | |
461 | * receiving device) to make netfilter happy, the REDIRECT | |
462 | * target in particular. Save the original destination IP | |
463 | * address to be able to detect DNAT afterwards. */ | |
06198b34 | 464 | static unsigned int br_nf_pre_routing(void *priv, |
795aa6ef | 465 | struct sk_buff *skb, |
238e54c9 | 466 | const struct nf_hook_state *state) |
1da177e4 | 467 | { |
faecbb45 | 468 | struct nf_bridge_info *nf_bridge; |
4df53d8b PM |
469 | struct net_bridge_port *p; |
470 | struct net_bridge *br; | |
e7c243c9 EP |
471 | __u32 len = nf_bridge_encap_header_len(skb); |
472 | ||
e7c243c9 | 473 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 474 | return NF_DROP; |
1da177e4 | 475 | |
238e54c9 | 476 | p = br_port_get_rcu(state->in); |
4df53d8b | 477 | if (p == NULL) |
deef4b52 | 478 | return NF_DROP; |
4df53d8b PM |
479 | br = p->br; |
480 | ||
739e4505 | 481 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
4df53d8b | 482 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 483 | return NF_ACCEPT; |
4df53d8b | 484 | |
fc38582d | 485 | nf_bridge_pull_encap_header_rcsum(skb); |
06198b34 | 486 | return br_nf_pre_routing_ipv6(priv, skb, state); |
1da177e4 | 487 | } |
4df53d8b PM |
488 | |
489 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 490 | return NF_ACCEPT; |
1da177e4 | 491 | |
739e4505 | 492 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
1da177e4 LT |
493 | return NF_ACCEPT; |
494 | ||
fc38582d | 495 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 496 | |
c1444c63 | 497 | if (br_validate_ipv4(state->net, skb)) |
deef4b52 | 498 | return NF_DROP; |
17762060 | 499 | |
789bc3e5 | 500 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 501 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 502 | return NF_DROP; |
5dce971a SH |
503 | if (!setup_pre_routing(skb)) |
504 | return NF_DROP; | |
c055d5b0 | 505 | |
faecbb45 FW |
506 | nf_bridge = nf_bridge_info_get(skb); |
507 | nf_bridge->ipv4_daddr = ip_hdr(skb)->daddr; | |
508 | ||
e179e632 | 509 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 510 | |
29a26a56 | 511 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, state->net, state->sk, skb, |
7026b1dd | 512 | skb->dev, NULL, |
1da177e4 LT |
513 | br_nf_pre_routing_finish); |
514 | ||
515 | return NF_STOLEN; | |
1da177e4 LT |
516 | } |
517 | ||
518 | ||
519 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
520 | /* The packet is locally destined, which requires a real | |
521 | * dst_entry, so detach the fake one. On the way up, the | |
522 | * packet would pass through PRE_ROUTING again (which already | |
523 | * took place when the packet entered the bridge), but we | |
524 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
525 | * prevent this from happening. */ | |
06198b34 | 526 | static unsigned int br_nf_local_in(void *priv, |
795aa6ef | 527 | struct sk_buff *skb, |
238e54c9 | 528 | const struct nf_hook_state *state) |
1da177e4 | 529 | { |
a881e963 | 530 | br_drop_fake_rtable(skb); |
1da177e4 LT |
531 | return NF_ACCEPT; |
532 | } | |
533 | ||
1da177e4 | 534 | /* PF_BRIDGE/FORWARD *************************************************/ |
0c4b51f0 | 535 | static int br_nf_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 536 | { |
38330783 | 537 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
1da177e4 | 538 | struct net_device *in; |
1da177e4 | 539 | |
739e4505 | 540 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
0b67c43c | 541 | |
efb6de9b | 542 | if (skb->protocol == htons(ETH_P_IP)) |
411ffb4f | 543 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; |
efb6de9b BT |
544 | |
545 | if (skb->protocol == htons(ETH_P_IPV6)) | |
546 | nf_bridge->frag_max_size = IP6CB(skb)->frag_max_size; | |
0b67c43c | 547 | |
1da177e4 | 548 | in = nf_bridge->physindev; |
a1e67951 | 549 | if (nf_bridge->pkt_otherhost) { |
1da177e4 | 550 | skb->pkt_type = PACKET_OTHERHOST; |
a1e67951 | 551 | nf_bridge->pkt_otherhost = false; |
1da177e4 | 552 | } |
e94c6743 | 553 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
554 | } else { |
555 | in = *((struct net_device **)(skb->cb)); | |
556 | } | |
fc38582d | 557 | nf_bridge_push_encap_header(skb); |
e179e632 | 558 | |
29a26a56 | 559 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, net, sk, skb, |
7026b1dd | 560 | in, skb->dev, br_forward_finish, 1); |
1da177e4 LT |
561 | return 0; |
562 | } | |
563 | ||
739e4505 | 564 | |
1da177e4 LT |
565 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
566 | * netfilter with indev and outdev set to the bridge device, | |
567 | * but we are still able to filter on the 'real' indev/outdev | |
568 | * because of the physdev module. For ARP, indev and outdev are the | |
569 | * bridge ports. */ | |
06198b34 | 570 | static unsigned int br_nf_forward_ip(void *priv, |
795aa6ef | 571 | struct sk_buff *skb, |
238e54c9 | 572 | const struct nf_hook_state *state) |
1da177e4 | 573 | { |
1da177e4 | 574 | struct nf_bridge_info *nf_bridge; |
5dce971a | 575 | struct net_device *parent; |
76108cea | 576 | u_int8_t pf; |
1da177e4 LT |
577 | |
578 | if (!skb->nf_bridge) | |
579 | return NF_ACCEPT; | |
580 | ||
2dc2f207 PM |
581 | /* Need exclusive nf_bridge_info since we might have multiple |
582 | * different physoutdevs. */ | |
583 | if (!nf_bridge_unshare(skb)) | |
584 | return NF_DROP; | |
585 | ||
38330783 FW |
586 | nf_bridge = nf_bridge_info_get(skb); |
587 | if (!nf_bridge) | |
588 | return NF_DROP; | |
589 | ||
238e54c9 | 590 | parent = bridge_parent(state->out); |
5dce971a SH |
591 | if (!parent) |
592 | return NF_DROP; | |
593 | ||
739e4505 | 594 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 595 | pf = NFPROTO_IPV4; |
739e4505 | 596 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 597 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
598 | else |
599 | return NF_ACCEPT; | |
1da177e4 | 600 | |
3db05fea | 601 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 602 | |
1da177e4 LT |
603 | if (skb->pkt_type == PACKET_OTHERHOST) { |
604 | skb->pkt_type = PACKET_HOST; | |
a1e67951 | 605 | nf_bridge->pkt_otherhost = true; |
1da177e4 LT |
606 | } |
607 | ||
0b67c43c | 608 | if (pf == NFPROTO_IPV4) { |
c1444c63 | 609 | if (br_validate_ipv4(state->net, skb)) |
0b67c43c | 610 | return NF_DROP; |
411ffb4f | 611 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; |
0b67c43c | 612 | } |
6b1e960f | 613 | |
efb6de9b | 614 | if (pf == NFPROTO_IPV6) { |
c1444c63 | 615 | if (br_validate_ipv6(state->net, skb)) |
efb6de9b BT |
616 | return NF_DROP; |
617 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
618 | } | |
619 | ||
1da177e4 | 620 | nf_bridge->physoutdev = skb->dev; |
aa740f46 | 621 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
622 | skb->protocol = htons(ETH_P_IP); |
623 | else | |
624 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 625 | |
29a26a56 | 626 | NF_HOOK(pf, NF_INET_FORWARD, state->net, NULL, skb, |
7026b1dd | 627 | brnf_get_logical_dev(skb, state->in), |
238e54c9 | 628 | parent, br_nf_forward_finish); |
1da177e4 LT |
629 | |
630 | return NF_STOLEN; | |
631 | } | |
632 | ||
06198b34 | 633 | static unsigned int br_nf_forward_arp(void *priv, |
795aa6ef | 634 | struct sk_buff *skb, |
238e54c9 | 635 | const struct nf_hook_state *state) |
1da177e4 | 636 | { |
4df53d8b PM |
637 | struct net_bridge_port *p; |
638 | struct net_bridge *br; | |
1da177e4 LT |
639 | struct net_device **d = (struct net_device **)(skb->cb); |
640 | ||
238e54c9 | 641 | p = br_port_get_rcu(state->out); |
4df53d8b PM |
642 | if (p == NULL) |
643 | return NF_ACCEPT; | |
644 | br = p->br; | |
645 | ||
646 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 647 | return NF_ACCEPT; |
1da177e4 | 648 | |
739e4505 | 649 | if (!IS_ARP(skb)) { |
8b42ec39 | 650 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 651 | return NF_ACCEPT; |
3db05fea | 652 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
653 | } |
654 | ||
d0a92be0 | 655 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 656 | if (IS_VLAN_ARP(skb)) |
3db05fea | 657 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
658 | return NF_ACCEPT; |
659 | } | |
238e54c9 | 660 | *d = state->in; |
29a26a56 | 661 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, state->net, state->sk, skb, |
7026b1dd | 662 | state->in, state->out, br_nf_forward_finish); |
1da177e4 LT |
663 | |
664 | return NF_STOLEN; | |
665 | } | |
666 | ||
6532948b | 667 | static int br_nf_push_frag_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
8bd63cf1 | 668 | { |
e70deecb | 669 | struct brnf_frag_data *data; |
8bd63cf1 | 670 | int err; |
8bd63cf1 | 671 | |
e70deecb FW |
672 | data = this_cpu_ptr(&brnf_frag_data_storage); |
673 | err = skb_cow_head(skb, data->size); | |
8bd63cf1 | 674 | |
e70deecb | 675 | if (err) { |
8bd63cf1 FW |
676 | kfree_skb(skb); |
677 | return 0; | |
678 | } | |
679 | ||
d7b59742 FW |
680 | if (data->vlan_tci) { |
681 | skb->vlan_tci = data->vlan_tci; | |
682 | skb->vlan_proto = data->vlan_proto; | |
683 | } | |
684 | ||
e70deecb FW |
685 | skb_copy_to_linear_data_offset(skb, -data->size, data->mac, data->size); |
686 | __skb_push(skb, data->encap_size); | |
687 | ||
a9fcc6a4 | 688 | nf_bridge_info_free(skb); |
0c4b51f0 | 689 | return br_dev_queue_push_xmit(net, sk, skb); |
8bd63cf1 FW |
690 | } |
691 | ||
8d4df0b9 EB |
692 | static int |
693 | br_nf_ip_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, | |
694869b3 | 694 | int (*output)(struct net *, struct sock *, struct sk_buff *)) |
49d16b23 AZ |
695 | { |
696 | unsigned int mtu = ip_skb_dst_mtu(skb); | |
697 | struct iphdr *iph = ip_hdr(skb); | |
49d16b23 AZ |
698 | |
699 | if (unlikely(((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) || | |
700 | (IPCB(skb)->frag_max_size && | |
701 | IPCB(skb)->frag_max_size > mtu))) { | |
8d4df0b9 | 702 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); |
49d16b23 AZ |
703 | kfree_skb(skb); |
704 | return -EMSGSIZE; | |
705 | } | |
706 | ||
694869b3 | 707 | return ip_do_fragment(net, sk, skb, output); |
49d16b23 AZ |
708 | } |
709 | ||
33b1f313 FW |
710 | static unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb) |
711 | { | |
712 | if (skb->nf_bridge->orig_proto == BRNF_PROTO_PPPOE) | |
713 | return PPPOE_SES_HLEN; | |
714 | return 0; | |
715 | } | |
716 | ||
0c4b51f0 | 717 | static int br_nf_dev_queue_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
2e2f7aef | 718 | { |
411ffb4f | 719 | struct nf_bridge_info *nf_bridge; |
7a8d831d | 720 | unsigned int mtu_reserved; |
462fb2af | 721 | |
efb6de9b BT |
722 | mtu_reserved = nf_bridge_mtu_reduction(skb); |
723 | ||
724 | if (skb_is_gso(skb) || skb->len + mtu_reserved <= skb->dev->mtu) { | |
a9fcc6a4 | 725 | nf_bridge_info_free(skb); |
0c4b51f0 | 726 | return br_dev_queue_push_xmit(net, sk, skb); |
a9fcc6a4 | 727 | } |
7a8d831d | 728 | |
411ffb4f | 729 | nf_bridge = nf_bridge_info_get(skb); |
efb6de9b | 730 | |
93fdd47e HX |
731 | /* This is wrong! We should preserve the original fragment |
732 | * boundaries by preserving frag_list rather than refragmenting. | |
733 | */ | |
c9322458 AB |
734 | if (IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) && |
735 | skb->protocol == htons(ETH_P_IP)) { | |
e70deecb FW |
736 | struct brnf_frag_data *data; |
737 | ||
c1444c63 | 738 | if (br_validate_ipv4(net, skb)) |
dd302b59 | 739 | goto drop; |
411ffb4f BT |
740 | |
741 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
e70deecb FW |
742 | |
743 | nf_bridge_update_protocol(skb); | |
744 | ||
745 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
d7b59742 FW |
746 | |
747 | data->vlan_tci = skb->vlan_tci; | |
748 | data->vlan_proto = skb->vlan_proto; | |
e70deecb FW |
749 | data->encap_size = nf_bridge_encap_header_len(skb); |
750 | data->size = ETH_HLEN + data->encap_size; | |
751 | ||
752 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, | |
753 | data->size); | |
754 | ||
694869b3 | 755 | return br_nf_ip_fragment(net, sk, skb, br_nf_push_frag_xmit); |
e70deecb | 756 | } |
c9322458 AB |
757 | if (IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) && |
758 | skb->protocol == htons(ETH_P_IPV6)) { | |
efb6de9b BT |
759 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); |
760 | struct brnf_frag_data *data; | |
462fb2af | 761 | |
c1444c63 | 762 | if (br_validate_ipv6(net, skb)) |
dd302b59 | 763 | goto drop; |
efb6de9b BT |
764 | |
765 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
766 | ||
767 | nf_bridge_update_protocol(skb); | |
768 | ||
769 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
770 | data->encap_size = nf_bridge_encap_header_len(skb); | |
771 | data->size = ETH_HLEN + data->encap_size; | |
772 | ||
773 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, | |
774 | data->size); | |
775 | ||
776 | if (v6ops) | |
7d8c6e39 | 777 | return v6ops->fragment(net, sk, skb, br_nf_push_frag_xmit); |
dd302b59 FW |
778 | |
779 | kfree_skb(skb); | |
780 | return -EMSGSIZE; | |
efb6de9b | 781 | } |
a9fcc6a4 | 782 | nf_bridge_info_free(skb); |
0c4b51f0 | 783 | return br_dev_queue_push_xmit(net, sk, skb); |
dd302b59 FW |
784 | drop: |
785 | kfree_skb(skb); | |
786 | return 0; | |
c197facc | 787 | } |
1da177e4 LT |
788 | |
789 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
06198b34 | 790 | static unsigned int br_nf_post_routing(void *priv, |
795aa6ef | 791 | struct sk_buff *skb, |
238e54c9 | 792 | const struct nf_hook_state *state) |
1da177e4 | 793 | { |
38330783 | 794 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
1da177e4 | 795 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 796 | u_int8_t pf; |
1da177e4 | 797 | |
e4bb9bcb FW |
798 | /* if nf_bridge is set, but ->physoutdev is NULL, this packet came in |
799 | * on a bridge, but was delivered locally and is now being routed: | |
800 | * | |
801 | * POST_ROUTING was already invoked from the ip stack. | |
802 | */ | |
803 | if (!nf_bridge || !nf_bridge->physoutdev) | |
81d9ddae PM |
804 | return NF_ACCEPT; |
805 | ||
5dce971a SH |
806 | if (!realoutdev) |
807 | return NF_DROP; | |
808 | ||
739e4505 | 809 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 810 | pf = NFPROTO_IPV4; |
739e4505 | 811 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 812 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
813 | else |
814 | return NF_ACCEPT; | |
1da177e4 | 815 | |
1da177e4 LT |
816 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
817 | * about the value of skb->pkt_type. */ | |
818 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
819 | skb->pkt_type = PACKET_HOST; | |
a1e67951 | 820 | nf_bridge->pkt_otherhost = true; |
1da177e4 LT |
821 | } |
822 | ||
fc38582d | 823 | nf_bridge_pull_encap_header(skb); |
aa740f46 | 824 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
825 | skb->protocol = htons(ETH_P_IP); |
826 | else | |
827 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 828 | |
29a26a56 | 829 | NF_HOOK(pf, NF_INET_POST_ROUTING, state->net, state->sk, skb, |
7026b1dd | 830 | NULL, realoutdev, |
2e2f7aef | 831 | br_nf_dev_queue_xmit); |
1da177e4 LT |
832 | |
833 | return NF_STOLEN; | |
1da177e4 LT |
834 | } |
835 | ||
1da177e4 LT |
836 | /* IP/SABOTAGE *****************************************************/ |
837 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
838 | * for the second time. */ | |
06198b34 | 839 | static unsigned int ip_sabotage_in(void *priv, |
795aa6ef | 840 | struct sk_buff *skb, |
238e54c9 | 841 | const struct nf_hook_state *state) |
1da177e4 | 842 | { |
72b1e5e4 | 843 | if (skb->nf_bridge && !skb->nf_bridge->in_prerouting) |
1da177e4 | 844 | return NF_STOP; |
1da177e4 LT |
845 | |
846 | return NF_ACCEPT; | |
847 | } | |
848 | ||
e5de75bf PNA |
849 | /* This is called when br_netfilter has called into iptables/netfilter, |
850 | * and DNAT has taken place on a bridge-forwarded packet. | |
851 | * | |
852 | * neigh->output has created a new MAC header, with local br0 MAC | |
853 | * as saddr. | |
854 | * | |
855 | * This restores the original MAC saddr of the bridged packet | |
856 | * before invoking bridge forward logic to transmit the packet. | |
857 | */ | |
858 | static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) | |
859 | { | |
38330783 | 860 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); |
e5de75bf PNA |
861 | |
862 | skb_pull(skb, ETH_HLEN); | |
72b1e5e4 | 863 | nf_bridge->bridged_dnat = 0; |
e5de75bf | 864 | |
e70deecb FW |
865 | BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN)); |
866 | ||
867 | skb_copy_to_linear_data_offset(skb, -(ETH_HLEN - ETH_ALEN), | |
868 | nf_bridge->neigh_header, | |
869 | ETH_HLEN - ETH_ALEN); | |
e5de75bf | 870 | skb->dev = nf_bridge->physindev; |
7fb48c5b FW |
871 | |
872 | nf_bridge->physoutdev = NULL; | |
0c4b51f0 | 873 | br_handle_frame_finish(dev_net(skb->dev), NULL, skb); |
e5de75bf PNA |
874 | } |
875 | ||
1a4ba64d | 876 | static int br_nf_dev_xmit(struct sk_buff *skb) |
e5de75bf | 877 | { |
72b1e5e4 | 878 | if (skb->nf_bridge && skb->nf_bridge->bridged_dnat) { |
e5de75bf PNA |
879 | br_nf_pre_routing_finish_bridge_slow(skb); |
880 | return 1; | |
881 | } | |
882 | return 0; | |
883 | } | |
1a4ba64d PNA |
884 | |
885 | static const struct nf_br_ops br_ops = { | |
886 | .br_dev_xmit_hook = br_nf_dev_xmit, | |
887 | }; | |
e5de75bf | 888 | |
4b7fd5d9 PNA |
889 | void br_netfilter_enable(void) |
890 | { | |
891 | } | |
892 | EXPORT_SYMBOL_GPL(br_netfilter_enable); | |
893 | ||
ea2d9b41 BDS |
894 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
895 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 896 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
897 | { |
898 | .hook = br_nf_pre_routing, | |
aa740f46 | 899 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
900 | .hooknum = NF_BR_PRE_ROUTING, |
901 | .priority = NF_BR_PRI_BRNF, | |
902 | }, | |
903 | { | |
904 | .hook = br_nf_local_in, | |
aa740f46 | 905 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
906 | .hooknum = NF_BR_LOCAL_IN, |
907 | .priority = NF_BR_PRI_BRNF, | |
908 | }, | |
909 | { | |
910 | .hook = br_nf_forward_ip, | |
aa740f46 | 911 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
912 | .hooknum = NF_BR_FORWARD, |
913 | .priority = NF_BR_PRI_BRNF - 1, | |
914 | }, | |
915 | { | |
916 | .hook = br_nf_forward_arp, | |
aa740f46 | 917 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
918 | .hooknum = NF_BR_FORWARD, |
919 | .priority = NF_BR_PRI_BRNF, | |
920 | }, | |
1490fd89 CG |
921 | { |
922 | .hook = br_nf_post_routing, | |
aa740f46 | 923 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
924 | .hooknum = NF_BR_POST_ROUTING, |
925 | .priority = NF_BR_PRI_LAST, | |
926 | }, | |
927 | { | |
928 | .hook = ip_sabotage_in, | |
aa740f46 | 929 | .pf = NFPROTO_IPV4, |
1490fd89 CG |
930 | .hooknum = NF_INET_PRE_ROUTING, |
931 | .priority = NF_IP_PRI_FIRST, | |
932 | }, | |
933 | { | |
934 | .hook = ip_sabotage_in, | |
aa740f46 | 935 | .pf = NFPROTO_IPV6, |
1490fd89 CG |
936 | .hooknum = NF_INET_PRE_ROUTING, |
937 | .priority = NF_IP6_PRI_FIRST, | |
938 | }, | |
1da177e4 LT |
939 | }; |
940 | ||
941 | #ifdef CONFIG_SYSCTL | |
942 | static | |
fe2c6338 | 943 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
56b148eb | 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 | ||
fe2c6338 | 955 | static struct ctl_table brnf_table[] = { |
1da177e4 | 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 | }, |
4981682c PNA |
991 | { |
992 | .procname = "bridge-nf-pass-vlan-input-dev", | |
993 | .data = &brnf_pass_vlan_indev, | |
994 | .maxlen = sizeof(int), | |
995 | .mode = 0644, | |
996 | .proc_handler = brnf_sysctl_call_tables, | |
997 | }, | |
f8572d8f | 998 | { } |
1da177e4 | 999 | }; |
1da177e4 LT |
1000 | #endif |
1001 | ||
34666d46 | 1002 | static int __init br_netfilter_init(void) |
1da177e4 | 1003 | { |
5eb87f45 | 1004 | int ret; |
1da177e4 | 1005 | |
34666d46 | 1006 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
5eb87f45 | 1007 | if (ret < 0) |
1da177e4 | 1008 | return ret; |
fc66f95c | 1009 | |
1da177e4 | 1010 | #ifdef CONFIG_SYSCTL |
ec8f23ce | 1011 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
1da177e4 | 1012 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1013 | printk(KERN_WARNING |
1014 | "br_netfilter: can't register to sysctl.\n"); | |
96727239 GU |
1015 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1016 | return -ENOMEM; | |
1da177e4 LT |
1017 | } |
1018 | #endif | |
1a4ba64d | 1019 | RCU_INIT_POINTER(nf_br_ops, &br_ops); |
1da177e4 | 1020 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1021 | return 0; |
1022 | } | |
1023 | ||
34666d46 | 1024 | static void __exit br_netfilter_fini(void) |
1da177e4 | 1025 | { |
1a4ba64d | 1026 | RCU_INIT_POINTER(nf_br_ops, NULL); |
5eb87f45 | 1027 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 | 1028 | #ifdef CONFIG_SYSCTL |
5dd3df10 | 1029 | unregister_net_sysctl_table(brnf_sysctl_header); |
1da177e4 LT |
1030 | #endif |
1031 | } | |
34666d46 PNA |
1032 | |
1033 | module_init(br_netfilter_init); | |
1034 | module_exit(br_netfilter_fini); | |
1035 | ||
1036 | MODULE_LICENSE("GPL"); | |
1037 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); | |
1038 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); | |
1039 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |