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 | 37 | #include <net/route.h> |
56768644 | 38 | #include <net/netfilter/br_netfilter.h> |
14c85021 | 39 | |
1da177e4 | 40 | #include <asm/uaccess.h> |
1da177e4 LT |
41 | #include "br_private.h" |
42 | #ifdef CONFIG_SYSCTL | |
43 | #include <linux/sysctl.h> | |
44 | #endif | |
45 | ||
46 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
47 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
48 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
49 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 50 | |
1da177e4 LT |
51 | #ifdef CONFIG_SYSCTL |
52 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
53 | static int brnf_call_iptables __read_mostly = 1; |
54 | static int brnf_call_ip6tables __read_mostly = 1; | |
55 | static int brnf_call_arptables __read_mostly = 1; | |
47e0e1ca HX |
56 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
57 | static int brnf_filter_pppoe_tagged __read_mostly = 0; | |
4981682c | 58 | static int brnf_pass_vlan_indev __read_mostly = 0; |
1da177e4 | 59 | #else |
4df53d8b PM |
60 | #define brnf_call_iptables 1 |
61 | #define brnf_call_ip6tables 1 | |
62 | #define brnf_call_arptables 1 | |
47e0e1ca HX |
63 | #define brnf_filter_vlan_tagged 0 |
64 | #define brnf_filter_pppoe_tagged 0 | |
4981682c | 65 | #define brnf_pass_vlan_indev 0 |
1da177e4 LT |
66 | #endif |
67 | ||
739e4505 | 68 | #define IS_IP(skb) \ |
df8a39de | 69 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) |
739e4505 FW |
70 | |
71 | #define IS_IPV6(skb) \ | |
df8a39de | 72 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) |
739e4505 FW |
73 | |
74 | #define IS_ARP(skb) \ | |
df8a39de | 75 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) |
739e4505 | 76 | |
b6f99a21 | 77 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 | 78 | { |
df8a39de | 79 | if (skb_vlan_tag_present(skb)) |
13937911 JG |
80 | return skb->protocol; |
81 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
82 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
83 | else | |
84 | return 0; | |
8b42ec39 SH |
85 | } |
86 | ||
87 | #define IS_VLAN_IP(skb) \ | |
13937911 | 88 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
89 | brnf_filter_vlan_tagged) |
90 | ||
91 | #define IS_VLAN_IPV6(skb) \ | |
13937911 | 92 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
8b42ec39 SH |
93 | brnf_filter_vlan_tagged) |
94 | ||
95 | #define IS_VLAN_ARP(skb) \ | |
13937911 | 96 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
8b42ec39 | 97 | brnf_filter_vlan_tagged) |
1da177e4 | 98 | |
516299d2 MM |
99 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
100 | { | |
101 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
102 | sizeof(struct pppoe_hdr))); | |
103 | } | |
104 | ||
105 | #define IS_PPPOE_IP(skb) \ | |
106 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
107 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
108 | brnf_filter_pppoe_tagged) | |
109 | ||
110 | #define IS_PPPOE_IPV6(skb) \ | |
111 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
112 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
113 | brnf_filter_pppoe_tagged) | |
114 | ||
4adf0af6 SW |
115 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) |
116 | { | |
b5ed54e9 | 117 | struct net_bridge_port *port; |
118 | ||
119 | port = br_port_get_rcu(dev); | |
120 | return port ? &port->br->fake_rtable : NULL; | |
4adf0af6 | 121 | } |
1da177e4 | 122 | |
5dce971a SH |
123 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
124 | { | |
b5ed54e9 | 125 | struct net_bridge_port *port; |
5dce971a | 126 | |
b5ed54e9 | 127 | port = br_port_get_rcu(dev); |
128 | return port ? port->br->dev : NULL; | |
5dce971a | 129 | } |
1da177e4 | 130 | |
fdeabdef SH |
131 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
132 | { | |
133 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
134 | if (likely(skb->nf_bridge)) | |
135 | atomic_set(&(skb->nf_bridge->use), 1); | |
136 | ||
137 | return skb->nf_bridge; | |
138 | } | |
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 | ||
fc38582d PM |
157 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
158 | { | |
159 | unsigned int len = nf_bridge_encap_header_len(skb); | |
160 | ||
161 | skb_push(skb, len); | |
162 | skb->network_header -= len; | |
163 | } | |
164 | ||
165 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 166 | { |
fc38582d PM |
167 | unsigned int len = nf_bridge_encap_header_len(skb); |
168 | ||
169 | skb_pull(skb, len); | |
170 | skb->network_header += len; | |
171 | } | |
fdeabdef | 172 | |
fc38582d PM |
173 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
174 | { | |
175 | unsigned int len = nf_bridge_encap_header_len(skb); | |
176 | ||
177 | skb_pull_rcsum(skb, len); | |
178 | skb->network_header += len; | |
179 | } | |
180 | ||
181 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
182 | { | |
183 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 184 | |
d626f62b ACM |
185 | skb_copy_from_linear_data_offset(skb, -header_size, |
186 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
187 | } |
188 | ||
462fb2af BD |
189 | /* When handing a packet over to the IP layer |
190 | * check whether we have a skb that is in the | |
191 | * expected format | |
192 | */ | |
193 | ||
d0280232 | 194 | static int br_parse_ip_options(struct sk_buff *skb) |
462fb2af | 195 | { |
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 | 203 | iph = ip_hdr(skb); |
462fb2af BD |
204 | |
205 | /* Basic sanity checks */ | |
206 | if (iph->ihl < 5 || iph->version != 4) | |
207 | goto inhdr_error; | |
208 | ||
209 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
210 | goto inhdr_error; | |
211 | ||
212 | iph = ip_hdr(skb); | |
213 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
214 | goto inhdr_error; | |
215 | ||
216 | len = ntohs(iph->tot_len); | |
217 | if (skb->len < len) { | |
218 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
219 | goto drop; | |
220 | } else if (len < (iph->ihl*4)) | |
221 | goto inhdr_error; | |
222 | ||
223 | if (pskb_trim_rcsum(skb, len)) { | |
224 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
225 | goto drop; | |
226 | } | |
227 | ||
f8e9881c | 228 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
7677e868 HX |
229 | /* We should really parse IP options here but until |
230 | * somebody who actually uses IP options complains to | |
231 | * us we'll just silently ignore the options because | |
232 | * we're lazy! | |
233 | */ | |
462fb2af BD |
234 | return 0; |
235 | ||
236 | inhdr_error: | |
237 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
238 | drop: | |
239 | return -1; | |
240 | } | |
241 | ||
4a9d2f20 FW |
242 | static void nf_bridge_update_protocol(struct sk_buff *skb) |
243 | { | |
244 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
245 | skb->protocol = htons(ETH_P_8021Q); | |
246 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
247 | skb->protocol = htons(ETH_P_PPP_SES); | |
248 | } | |
249 | ||
1da177e4 LT |
250 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
251 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
252 | * bridge PRE_ROUTING hook. */ | |
253 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
254 | { | |
255 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 256 | struct rtable *rt; |
1da177e4 | 257 | |
1da177e4 LT |
258 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
259 | skb->pkt_type = PACKET_OTHERHOST; | |
260 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
261 | } | |
262 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
263 | ||
511c3f92 ED |
264 | rt = bridge_parent_rtable(nf_bridge->physindev); |
265 | if (!rt) { | |
4adf0af6 SW |
266 | kfree_skb(skb); |
267 | return 0; | |
268 | } | |
f9181f4f | 269 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
270 | |
271 | skb->dev = nf_bridge->physindev; | |
e179e632 | 272 | nf_bridge_update_protocol(skb); |
fc38582d | 273 | nf_bridge_push_encap_header(skb); |
713aefa3 | 274 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
275 | br_handle_frame_finish, 1); |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
e179e632 BDS |
280 | /* Obtain the correct destination MAC address, while preserving the original |
281 | * source MAC address. If we already know this address, we just copy it. If we | |
282 | * don't, we use the neighbour framework to find out. In both cases, we make | |
283 | * sure that br_handle_frame_finish() is called afterwards. | |
284 | */ | |
285 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
286 | { | |
287 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
f6b72b62 | 288 | struct neighbour *neigh; |
e179e632 BDS |
289 | struct dst_entry *dst; |
290 | ||
291 | skb->dev = bridge_parent(skb->dev); | |
292 | if (!skb->dev) | |
293 | goto free_skb; | |
294 | dst = skb_dst(skb); | |
f9d75166 DM |
295 | neigh = dst_neigh_lookup_skb(dst, skb); |
296 | if (neigh) { | |
297 | int ret; | |
298 | ||
299 | if (neigh->hh.hh_len) { | |
300 | neigh_hh_bridge(&neigh->hh, skb); | |
301 | skb->dev = nf_bridge->physindev; | |
302 | ret = br_handle_frame_finish(skb); | |
303 | } else { | |
304 | /* the neighbour function below overwrites the complete | |
305 | * MAC header, so we save the Ethernet source address and | |
306 | * protocol number. | |
307 | */ | |
308 | skb_copy_from_linear_data_offset(skb, | |
309 | -(ETH_HLEN-ETH_ALEN), | |
310 | skb->nf_bridge->data, | |
311 | ETH_HLEN-ETH_ALEN); | |
312 | /* tell br_dev_xmit to continue with forwarding */ | |
313 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
93fdd47e | 314 | /* FIXME Need to refragment */ |
f9d75166 DM |
315 | ret = neigh->output(neigh, skb); |
316 | } | |
317 | neigh_release(neigh); | |
318 | return ret; | |
e179e632 BDS |
319 | } |
320 | free_skb: | |
321 | kfree_skb(skb); | |
322 | return 0; | |
323 | } | |
324 | ||
1da177e4 | 325 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 326 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
327 | * |
328 | * There are two cases to consider: | |
329 | * 1. The packet was DNAT'ed to a device in the same bridge | |
330 | * port group as it was received on. We can still bridge | |
331 | * the packet. | |
332 | * 2. The packet was DNAT'ed to a different device, either | |
333 | * a non-bridged device or another bridge port group. | |
334 | * The packet will need to be routed. | |
335 | * | |
336 | * The correct way of distinguishing between these two cases is to | |
337 | * call ip_route_input() and to look at skb->dst->dev, which is | |
338 | * changed to the destination device if ip_route_input() succeeds. | |
339 | * | |
ea2d9b41 | 340 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 341 | * |
ea2d9b41 BDS |
342 | * If the output device equals the logical bridge device the packet |
343 | * came in on, we can consider this bridging. The corresponding MAC | |
344 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
345 | * Otherwise, the packet is considered to be routed and we just |
346 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
347 | * later be passed up to the IP stack to be routed. For a redirected |
348 | * packet, ip_route_input() will give back the localhost as output device, | |
349 | * which differs from the bridge device. | |
1da177e4 | 350 | * |
ea2d9b41 | 351 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 352 | * |
f216f082 BDS |
353 | * This can be because the destination address is martian, in which case |
354 | * the packet will be dropped. | |
ea2d9b41 BDS |
355 | * If IP forwarding is disabled, ip_route_input() will fail, while |
356 | * ip_route_output_key() can return success. The source | |
357 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 358 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
359 | * if IP forwarding is enabled. If the output device equals the logical bridge |
360 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
361 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
362 | */ | |
1da177e4 LT |
363 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
364 | { | |
365 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 366 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 367 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 368 | struct rtable *rt; |
f216f082 | 369 | int err; |
93fdd47e HX |
370 | int frag_max_size; |
371 | ||
372 | frag_max_size = IPCB(skb)->frag_max_size; | |
373 | BR_INPUT_SKB_CB(skb)->frag_max_size = frag_max_size; | |
1da177e4 | 374 | |
1da177e4 LT |
375 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
376 | skb->pkt_type = PACKET_OTHERHOST; | |
377 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
378 | } | |
379 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 380 | if (dnat_took_place(skb)) { |
f216f082 | 381 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 382 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
383 | |
384 | /* If err equals -EHOSTUNREACH the error is due to a | |
385 | * martian destination or due to the fact that | |
386 | * forwarding is disabled. For most martian packets, | |
387 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
388 | * martian destinations: loopback destinations and destination | |
389 | * 0.0.0.0. In both cases the packet will be dropped because the | |
390 | * destination is the loopback device and not the bridge. */ | |
391 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
392 | goto free_skb; | |
1da177e4 | 393 | |
78fbfd8a DM |
394 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
395 | RT_TOS(iph->tos), 0); | |
b23dd4fe | 396 | if (!IS_ERR(rt)) { |
1c011bed | 397 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 398 | * require ip_forwarding. */ |
b23dd4fe DM |
399 | if (rt->dst.dev == dev) { |
400 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
401 | goto bridged_dnat; |
402 | } | |
b23dd4fe | 403 | ip_rt_put(rt); |
1da177e4 | 404 | } |
f216f082 | 405 | free_skb: |
1da177e4 LT |
406 | kfree_skb(skb); |
407 | return 0; | |
408 | } else { | |
adf30907 | 409 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 410 | bridged_dnat: |
1da177e4 | 411 | skb->dev = nf_bridge->physindev; |
e179e632 | 412 | nf_bridge_update_protocol(skb); |
fc38582d | 413 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
414 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
415 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
416 | skb, skb->dev, NULL, |
417 | br_nf_pre_routing_finish_bridge, | |
418 | 1); | |
419 | return 0; | |
420 | } | |
04091142 | 421 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); |
1da177e4 LT |
422 | skb->pkt_type = PACKET_HOST; |
423 | } | |
424 | } else { | |
511c3f92 ED |
425 | rt = bridge_parent_rtable(nf_bridge->physindev); |
426 | if (!rt) { | |
4adf0af6 SW |
427 | kfree_skb(skb); |
428 | return 0; | |
429 | } | |
f9181f4f | 430 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
431 | } |
432 | ||
433 | skb->dev = nf_bridge->physindev; | |
e179e632 | 434 | nf_bridge_update_protocol(skb); |
fc38582d | 435 | nf_bridge_push_encap_header(skb); |
713aefa3 | 436 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
437 | br_handle_frame_finish, 1); |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
4981682c PNA |
442 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
443 | { | |
444 | struct net_device *vlan, *br; | |
445 | ||
446 | br = bridge_parent(dev); | |
df8a39de | 447 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) |
4981682c PNA |
448 | return br; |
449 | ||
f06c7f9f | 450 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, |
df8a39de | 451 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); |
4981682c PNA |
452 | |
453 | return vlan ? vlan : br; | |
454 | } | |
455 | ||
1da177e4 | 456 | /* Some common code for IPv4/IPv6 */ |
5dce971a | 457 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
458 | { |
459 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
460 | ||
461 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
462 | skb->pkt_type = PACKET_HOST; | |
463 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
464 | } | |
465 | ||
466 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
467 | nf_bridge->physindev = skb->dev; | |
4981682c | 468 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
e179e632 BDS |
469 | if (skb->protocol == htons(ETH_P_8021Q)) |
470 | nf_bridge->mask |= BRNF_8021Q; | |
471 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
472 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a | 473 | |
6b8dbcf2 FW |
474 | /* Must drop socket now because of tproxy. */ |
475 | skb_orphan(skb); | |
5dce971a | 476 | return skb->dev; |
1da177e4 LT |
477 | } |
478 | ||
479 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
480 | static int check_hbh_len(struct sk_buff *skb) | |
481 | { | |
0660e03f | 482 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 483 | u32 pkt_len; |
d56f90a7 ACM |
484 | const unsigned char *nh = skb_network_header(skb); |
485 | int off = raw - nh; | |
789bc3e5 | 486 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
487 | |
488 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
489 | goto bad; | |
490 | ||
491 | off += 2; | |
492 | len -= 2; | |
493 | ||
494 | while (len > 0) { | |
d56f90a7 | 495 | int optlen = nh[off + 1] + 2; |
1da177e4 | 496 | |
d56f90a7 | 497 | switch (nh[off]) { |
1de5a71c | 498 | case IPV6_TLV_PAD1: |
1da177e4 LT |
499 | optlen = 1; |
500 | break; | |
501 | ||
502 | case IPV6_TLV_PADN: | |
503 | break; | |
504 | ||
505 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 506 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 507 | goto bad; |
d56f90a7 | 508 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 509 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 510 | ipv6_hdr(skb)->payload_len) |
b0366486 | 511 | goto bad; |
1da177e4 LT |
512 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
513 | goto bad; | |
b0366486 | 514 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 515 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 516 | goto bad; |
d56f90a7 | 517 | nh = skb_network_header(skb); |
1da177e4 LT |
518 | break; |
519 | default: | |
520 | if (optlen > len) | |
521 | goto bad; | |
522 | break; | |
523 | } | |
524 | off += optlen; | |
525 | len -= optlen; | |
526 | } | |
527 | if (len == 0) | |
528 | return 0; | |
529 | bad: | |
530 | return -1; | |
531 | ||
532 | } | |
533 | ||
534 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
535 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
795aa6ef | 536 | static unsigned int br_nf_pre_routing_ipv6(const struct nf_hook_ops *ops, |
789bc3e5 SH |
537 | struct sk_buff *skb, |
538 | const struct net_device *in, | |
539 | const struct net_device *out, | |
540 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 541 | { |
b71d1d42 | 542 | const struct ipv6hdr *hdr; |
1da177e4 | 543 | u32 pkt_len; |
1da177e4 LT |
544 | |
545 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 546 | return NF_DROP; |
1da177e4 LT |
547 | |
548 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 549 | return NF_DROP; |
1da177e4 | 550 | |
0660e03f | 551 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
552 | |
553 | if (hdr->version != 6) | |
deef4b52 | 554 | return NF_DROP; |
1da177e4 LT |
555 | |
556 | pkt_len = ntohs(hdr->payload_len); | |
557 | ||
558 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
559 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 560 | return NF_DROP; |
b38dfee3 | 561 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 562 | return NF_DROP; |
1da177e4 LT |
563 | } |
564 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 565 | return NF_DROP; |
1da177e4 | 566 | |
789bc3e5 | 567 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 568 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 569 | return NF_DROP; |
5dce971a SH |
570 | if (!setup_pre_routing(skb)) |
571 | return NF_DROP; | |
1da177e4 | 572 | |
e179e632 | 573 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 574 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
575 | br_nf_pre_routing_finish_ipv6); |
576 | ||
577 | return NF_STOLEN; | |
1da177e4 LT |
578 | } |
579 | ||
580 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
581 | * Replicate the checks that IPv4 does on packet reception. | |
582 | * Set skb->dev to the bridge device (i.e. parent of the | |
583 | * receiving device) to make netfilter happy, the REDIRECT | |
584 | * target in particular. Save the original destination IP | |
585 | * address to be able to detect DNAT afterwards. */ | |
795aa6ef PM |
586 | static unsigned int br_nf_pre_routing(const struct nf_hook_ops *ops, |
587 | struct sk_buff *skb, | |
ee02b3a6 SH |
588 | const struct net_device *in, |
589 | const struct net_device *out, | |
590 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 591 | { |
4df53d8b PM |
592 | struct net_bridge_port *p; |
593 | struct net_bridge *br; | |
e7c243c9 EP |
594 | __u32 len = nf_bridge_encap_header_len(skb); |
595 | ||
e7c243c9 | 596 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 597 | return NF_DROP; |
1da177e4 | 598 | |
e490c1de | 599 | p = br_port_get_rcu(in); |
4df53d8b | 600 | if (p == NULL) |
deef4b52 | 601 | return NF_DROP; |
4df53d8b PM |
602 | br = p->br; |
603 | ||
739e4505 | 604 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
4df53d8b | 605 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 606 | return NF_ACCEPT; |
4df53d8b | 607 | |
fc38582d | 608 | nf_bridge_pull_encap_header_rcsum(skb); |
795aa6ef | 609 | return br_nf_pre_routing_ipv6(ops, skb, in, out, okfn); |
1da177e4 | 610 | } |
4df53d8b PM |
611 | |
612 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 613 | return NF_ACCEPT; |
1da177e4 | 614 | |
739e4505 | 615 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
1da177e4 LT |
616 | return NF_ACCEPT; |
617 | ||
fc38582d | 618 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 619 | |
462fb2af | 620 | if (br_parse_ip_options(skb)) |
deef4b52 | 621 | return NF_DROP; |
17762060 | 622 | |
789bc3e5 | 623 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 624 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 625 | return NF_DROP; |
5dce971a SH |
626 | if (!setup_pre_routing(skb)) |
627 | return NF_DROP; | |
1da177e4 | 628 | store_orig_dstaddr(skb); |
e179e632 | 629 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 630 | |
713aefa3 | 631 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
632 | br_nf_pre_routing_finish); |
633 | ||
634 | return NF_STOLEN; | |
1da177e4 LT |
635 | } |
636 | ||
637 | ||
638 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
639 | /* The packet is locally destined, which requires a real | |
640 | * dst_entry, so detach the fake one. On the way up, the | |
641 | * packet would pass through PRE_ROUTING again (which already | |
642 | * took place when the packet entered the bridge), but we | |
643 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
644 | * prevent this from happening. */ | |
795aa6ef PM |
645 | static unsigned int br_nf_local_in(const struct nf_hook_ops *ops, |
646 | struct sk_buff *skb, | |
789bc3e5 SH |
647 | const struct net_device *in, |
648 | const struct net_device *out, | |
649 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 650 | { |
a881e963 | 651 | br_drop_fake_rtable(skb); |
1da177e4 LT |
652 | return NF_ACCEPT; |
653 | } | |
654 | ||
1da177e4 LT |
655 | /* PF_BRIDGE/FORWARD *************************************************/ |
656 | static int br_nf_forward_finish(struct sk_buff *skb) | |
657 | { | |
658 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
659 | struct net_device *in; | |
1da177e4 | 660 | |
739e4505 | 661 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
662 | in = nf_bridge->physindev; |
663 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
664 | skb->pkt_type = PACKET_OTHERHOST; | |
665 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
666 | } | |
e94c6743 | 667 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
668 | } else { |
669 | in = *((struct net_device **)(skb->cb)); | |
670 | } | |
fc38582d | 671 | nf_bridge_push_encap_header(skb); |
e179e632 | 672 | |
713aefa3 | 673 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 674 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
675 | return 0; |
676 | } | |
677 | ||
739e4505 | 678 | |
1da177e4 LT |
679 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
680 | * netfilter with indev and outdev set to the bridge device, | |
681 | * but we are still able to filter on the 'real' indev/outdev | |
682 | * because of the physdev module. For ARP, indev and outdev are the | |
683 | * bridge ports. */ | |
795aa6ef PM |
684 | static unsigned int br_nf_forward_ip(const struct nf_hook_ops *ops, |
685 | struct sk_buff *skb, | |
789bc3e5 SH |
686 | const struct net_device *in, |
687 | const struct net_device *out, | |
688 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 689 | { |
1da177e4 | 690 | struct nf_bridge_info *nf_bridge; |
5dce971a | 691 | struct net_device *parent; |
76108cea | 692 | u_int8_t pf; |
1da177e4 LT |
693 | |
694 | if (!skb->nf_bridge) | |
695 | return NF_ACCEPT; | |
696 | ||
2dc2f207 PM |
697 | /* Need exclusive nf_bridge_info since we might have multiple |
698 | * different physoutdevs. */ | |
699 | if (!nf_bridge_unshare(skb)) | |
700 | return NF_DROP; | |
701 | ||
5dce971a SH |
702 | parent = bridge_parent(out); |
703 | if (!parent) | |
704 | return NF_DROP; | |
705 | ||
739e4505 | 706 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 707 | pf = NFPROTO_IPV4; |
739e4505 | 708 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 709 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
710 | else |
711 | return NF_ACCEPT; | |
1da177e4 | 712 | |
3db05fea | 713 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 714 | |
1da177e4 LT |
715 | nf_bridge = skb->nf_bridge; |
716 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
717 | skb->pkt_type = PACKET_HOST; | |
718 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
719 | } | |
720 | ||
aa740f46 | 721 | if (pf == NFPROTO_IPV4 && br_parse_ip_options(skb)) |
6b1e960f HX |
722 | return NF_DROP; |
723 | ||
1da177e4 LT |
724 | /* The physdev module checks on this */ |
725 | nf_bridge->mask |= BRNF_BRIDGED; | |
726 | nf_bridge->physoutdev = skb->dev; | |
aa740f46 | 727 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
728 | skb->protocol = htons(ETH_P_IP); |
729 | else | |
730 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 731 | |
4981682c | 732 | NF_HOOK(pf, NF_INET_FORWARD, skb, brnf_get_logical_dev(skb, in), parent, |
5dce971a | 733 | br_nf_forward_finish); |
1da177e4 LT |
734 | |
735 | return NF_STOLEN; | |
736 | } | |
737 | ||
795aa6ef PM |
738 | static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops, |
739 | struct sk_buff *skb, | |
789bc3e5 SH |
740 | const struct net_device *in, |
741 | const struct net_device *out, | |
742 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 743 | { |
4df53d8b PM |
744 | struct net_bridge_port *p; |
745 | struct net_bridge *br; | |
1da177e4 LT |
746 | struct net_device **d = (struct net_device **)(skb->cb); |
747 | ||
e490c1de | 748 | p = br_port_get_rcu(out); |
4df53d8b PM |
749 | if (p == NULL) |
750 | return NF_ACCEPT; | |
751 | br = p->br; | |
752 | ||
753 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 754 | return NF_ACCEPT; |
1da177e4 | 755 | |
739e4505 | 756 | if (!IS_ARP(skb)) { |
8b42ec39 | 757 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 758 | return NF_ACCEPT; |
3db05fea | 759 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
760 | } |
761 | ||
d0a92be0 | 762 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 763 | if (IS_VLAN_ARP(skb)) |
3db05fea | 764 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
765 | return NF_ACCEPT; |
766 | } | |
767 | *d = (struct net_device *)in; | |
fdc9314c | 768 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
769 | (struct net_device *)out, br_nf_forward_finish); |
770 | ||
771 | return NF_STOLEN; | |
772 | } | |
773 | ||
aff09ce3 | 774 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) |
8bd63cf1 FW |
775 | static bool nf_bridge_copy_header(struct sk_buff *skb) |
776 | { | |
777 | int err; | |
778 | unsigned int header_size; | |
779 | ||
780 | nf_bridge_update_protocol(skb); | |
781 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
782 | err = skb_cow_head(skb, header_size); | |
783 | if (err) | |
784 | return false; | |
785 | ||
786 | skb_copy_to_linear_data_offset(skb, -header_size, | |
787 | skb->nf_bridge->data, header_size); | |
788 | __skb_push(skb, nf_bridge_encap_header_len(skb)); | |
789 | return true; | |
790 | } | |
791 | ||
792 | static int br_nf_push_frag_xmit(struct sk_buff *skb) | |
793 | { | |
794 | if (!nf_bridge_copy_header(skb)) { | |
795 | kfree_skb(skb); | |
796 | return 0; | |
797 | } | |
798 | ||
799 | return br_dev_queue_push_xmit(skb); | |
800 | } | |
801 | ||
2e2f7aef PM |
802 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
803 | { | |
462fb2af | 804 | int ret; |
93fdd47e | 805 | int frag_max_size; |
7a8d831d | 806 | unsigned int mtu_reserved; |
462fb2af | 807 | |
7a8d831d FW |
808 | if (skb_is_gso(skb) || skb->protocol != htons(ETH_P_IP)) |
809 | return br_dev_queue_push_xmit(skb); | |
810 | ||
811 | mtu_reserved = nf_bridge_mtu_reduction(skb); | |
93fdd47e HX |
812 | /* This is wrong! We should preserve the original fragment |
813 | * boundaries by preserving frag_list rather than refragmenting. | |
814 | */ | |
7a8d831d | 815 | if (skb->len + mtu_reserved > skb->dev->mtu) { |
93fdd47e | 816 | frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size; |
462fb2af BD |
817 | if (br_parse_ip_options(skb)) |
818 | /* Drop invalid packet */ | |
819 | return NF_DROP; | |
93fdd47e | 820 | IPCB(skb)->frag_max_size = frag_max_size; |
8bd63cf1 | 821 | ret = ip_fragment(skb, br_nf_push_frag_xmit); |
87f94b4e | 822 | } else |
462fb2af BD |
823 | ret = br_dev_queue_push_xmit(skb); |
824 | ||
825 | return ret; | |
2e2f7aef | 826 | } |
c197facc | 827 | #else |
828 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
829 | { | |
830 | return br_dev_queue_push_xmit(skb); | |
831 | } | |
832 | #endif | |
1da177e4 LT |
833 | |
834 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
795aa6ef PM |
835 | static unsigned int br_nf_post_routing(const struct nf_hook_ops *ops, |
836 | struct sk_buff *skb, | |
789bc3e5 SH |
837 | const struct net_device *in, |
838 | const struct net_device *out, | |
839 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 840 | { |
3db05fea | 841 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 842 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 843 | u_int8_t pf; |
1da177e4 | 844 | |
ea2d9b41 | 845 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
846 | return NF_ACCEPT; |
847 | ||
5dce971a SH |
848 | if (!realoutdev) |
849 | return NF_DROP; | |
850 | ||
739e4505 | 851 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 852 | pf = NFPROTO_IPV4; |
739e4505 | 853 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 854 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
855 | else |
856 | return NF_ACCEPT; | |
1da177e4 | 857 | |
1da177e4 LT |
858 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
859 | * about the value of skb->pkt_type. */ | |
860 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
861 | skb->pkt_type = PACKET_HOST; | |
862 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
863 | } | |
864 | ||
fc38582d | 865 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 866 | nf_bridge_save_header(skb); |
aa740f46 | 867 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
868 | skb->protocol = htons(ETH_P_IP); |
869 | else | |
870 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 871 | |
6e23ae2a | 872 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 873 | br_nf_dev_queue_xmit); |
1da177e4 LT |
874 | |
875 | return NF_STOLEN; | |
1da177e4 LT |
876 | } |
877 | ||
1da177e4 LT |
878 | /* IP/SABOTAGE *****************************************************/ |
879 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
880 | * for the second time. */ | |
795aa6ef PM |
881 | static unsigned int ip_sabotage_in(const struct nf_hook_ops *ops, |
882 | struct sk_buff *skb, | |
789bc3e5 SH |
883 | const struct net_device *in, |
884 | const struct net_device *out, | |
885 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 886 | { |
3db05fea HX |
887 | if (skb->nf_bridge && |
888 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
889 | return NF_STOP; |
890 | } | |
891 | ||
892 | return NF_ACCEPT; | |
893 | } | |
894 | ||
e5de75bf PNA |
895 | /* This is called when br_netfilter has called into iptables/netfilter, |
896 | * and DNAT has taken place on a bridge-forwarded packet. | |
897 | * | |
898 | * neigh->output has created a new MAC header, with local br0 MAC | |
899 | * as saddr. | |
900 | * | |
901 | * This restores the original MAC saddr of the bridged packet | |
902 | * before invoking bridge forward logic to transmit the packet. | |
903 | */ | |
904 | static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) | |
905 | { | |
906 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
907 | ||
908 | skb_pull(skb, ETH_HLEN); | |
909 | nf_bridge->mask &= ~BRNF_BRIDGED_DNAT; | |
910 | ||
911 | skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), | |
912 | skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
913 | skb->dev = nf_bridge->physindev; | |
914 | br_handle_frame_finish(skb); | |
915 | } | |
916 | ||
1a4ba64d | 917 | static int br_nf_dev_xmit(struct sk_buff *skb) |
e5de75bf PNA |
918 | { |
919 | if (skb->nf_bridge && (skb->nf_bridge->mask & BRNF_BRIDGED_DNAT)) { | |
920 | br_nf_pre_routing_finish_bridge_slow(skb); | |
921 | return 1; | |
922 | } | |
923 | return 0; | |
924 | } | |
1a4ba64d PNA |
925 | |
926 | static const struct nf_br_ops br_ops = { | |
927 | .br_dev_xmit_hook = br_nf_dev_xmit, | |
928 | }; | |
e5de75bf | 929 | |
4b7fd5d9 PNA |
930 | void br_netfilter_enable(void) |
931 | { | |
932 | } | |
933 | EXPORT_SYMBOL_GPL(br_netfilter_enable); | |
934 | ||
ea2d9b41 BDS |
935 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
936 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 937 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
938 | { |
939 | .hook = br_nf_pre_routing, | |
940 | .owner = THIS_MODULE, | |
aa740f46 | 941 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
942 | .hooknum = NF_BR_PRE_ROUTING, |
943 | .priority = NF_BR_PRI_BRNF, | |
944 | }, | |
945 | { | |
946 | .hook = br_nf_local_in, | |
947 | .owner = THIS_MODULE, | |
aa740f46 | 948 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
949 | .hooknum = NF_BR_LOCAL_IN, |
950 | .priority = NF_BR_PRI_BRNF, | |
951 | }, | |
952 | { | |
953 | .hook = br_nf_forward_ip, | |
954 | .owner = THIS_MODULE, | |
aa740f46 | 955 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
956 | .hooknum = NF_BR_FORWARD, |
957 | .priority = NF_BR_PRI_BRNF - 1, | |
958 | }, | |
959 | { | |
960 | .hook = br_nf_forward_arp, | |
961 | .owner = THIS_MODULE, | |
aa740f46 | 962 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
963 | .hooknum = NF_BR_FORWARD, |
964 | .priority = NF_BR_PRI_BRNF, | |
965 | }, | |
1490fd89 CG |
966 | { |
967 | .hook = br_nf_post_routing, | |
968 | .owner = THIS_MODULE, | |
aa740f46 | 969 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
970 | .hooknum = NF_BR_POST_ROUTING, |
971 | .priority = NF_BR_PRI_LAST, | |
972 | }, | |
973 | { | |
974 | .hook = ip_sabotage_in, | |
975 | .owner = THIS_MODULE, | |
aa740f46 | 976 | .pf = NFPROTO_IPV4, |
1490fd89 CG |
977 | .hooknum = NF_INET_PRE_ROUTING, |
978 | .priority = NF_IP_PRI_FIRST, | |
979 | }, | |
980 | { | |
981 | .hook = ip_sabotage_in, | |
982 | .owner = THIS_MODULE, | |
aa740f46 | 983 | .pf = NFPROTO_IPV6, |
1490fd89 CG |
984 | .hooknum = NF_INET_PRE_ROUTING, |
985 | .priority = NF_IP6_PRI_FIRST, | |
986 | }, | |
1da177e4 LT |
987 | }; |
988 | ||
989 | #ifdef CONFIG_SYSCTL | |
990 | static | |
fe2c6338 | 991 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, |
56b148eb | 992 | void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
993 | { |
994 | int ret; | |
995 | ||
8d65af78 | 996 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
997 | |
998 | if (write && *(int *)(ctl->data)) | |
999 | *(int *)(ctl->data) = 1; | |
1000 | return ret; | |
1001 | } | |
1002 | ||
fe2c6338 | 1003 | static struct ctl_table brnf_table[] = { |
1da177e4 | 1004 | { |
1da177e4 LT |
1005 | .procname = "bridge-nf-call-arptables", |
1006 | .data = &brnf_call_arptables, | |
1007 | .maxlen = sizeof(int), | |
1008 | .mode = 0644, | |
6d9f239a | 1009 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
1010 | }, |
1011 | { | |
1da177e4 LT |
1012 | .procname = "bridge-nf-call-iptables", |
1013 | .data = &brnf_call_iptables, | |
1014 | .maxlen = sizeof(int), | |
1015 | .mode = 0644, | |
6d9f239a | 1016 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
1017 | }, |
1018 | { | |
1da177e4 LT |
1019 | .procname = "bridge-nf-call-ip6tables", |
1020 | .data = &brnf_call_ip6tables, | |
1021 | .maxlen = sizeof(int), | |
1022 | .mode = 0644, | |
6d9f239a | 1023 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
1024 | }, |
1025 | { | |
1da177e4 LT |
1026 | .procname = "bridge-nf-filter-vlan-tagged", |
1027 | .data = &brnf_filter_vlan_tagged, | |
1028 | .maxlen = sizeof(int), | |
1029 | .mode = 0644, | |
6d9f239a | 1030 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
1031 | }, |
1032 | { | |
516299d2 MM |
1033 | .procname = "bridge-nf-filter-pppoe-tagged", |
1034 | .data = &brnf_filter_pppoe_tagged, | |
1035 | .maxlen = sizeof(int), | |
1036 | .mode = 0644, | |
6d9f239a | 1037 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 1038 | }, |
4981682c PNA |
1039 | { |
1040 | .procname = "bridge-nf-pass-vlan-input-dev", | |
1041 | .data = &brnf_pass_vlan_indev, | |
1042 | .maxlen = sizeof(int), | |
1043 | .mode = 0644, | |
1044 | .proc_handler = brnf_sysctl_call_tables, | |
1045 | }, | |
f8572d8f | 1046 | { } |
1da177e4 | 1047 | }; |
1da177e4 LT |
1048 | #endif |
1049 | ||
34666d46 | 1050 | static int __init br_netfilter_init(void) |
1da177e4 | 1051 | { |
5eb87f45 | 1052 | int ret; |
1da177e4 | 1053 | |
34666d46 | 1054 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
5eb87f45 | 1055 | if (ret < 0) |
1da177e4 | 1056 | return ret; |
fc66f95c | 1057 | |
1da177e4 | 1058 | #ifdef CONFIG_SYSCTL |
ec8f23ce | 1059 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
1da177e4 | 1060 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1061 | printk(KERN_WARNING |
1062 | "br_netfilter: can't register to sysctl.\n"); | |
96727239 GU |
1063 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1064 | return -ENOMEM; | |
1da177e4 LT |
1065 | } |
1066 | #endif | |
1a4ba64d | 1067 | RCU_INIT_POINTER(nf_br_ops, &br_ops); |
1da177e4 | 1068 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1069 | return 0; |
1070 | } | |
1071 | ||
34666d46 | 1072 | static void __exit br_netfilter_fini(void) |
1da177e4 | 1073 | { |
1a4ba64d | 1074 | RCU_INIT_POINTER(nf_br_ops, NULL); |
5eb87f45 | 1075 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 | 1076 | #ifdef CONFIG_SYSCTL |
5dd3df10 | 1077 | unregister_net_sysctl_table(brnf_sysctl_header); |
1da177e4 LT |
1078 | #endif |
1079 | } | |
34666d46 PNA |
1080 | |
1081 | module_init(br_netfilter_init); | |
1082 | module_exit(br_netfilter_fini); | |
1083 | ||
1084 | MODULE_LICENSE("GPL"); | |
1085 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); | |
1086 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); | |
1087 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |