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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
8237908e BDS |
6 | * Lennert Buytenhek <buytenh@gnu.org> |
7 | * Bart De Schuymer <bdschuym@pandora.be> | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Lennert dedicates this file to Kerstin Wurdinger. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/ip.h> |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/skbuff.h> | |
14c85021 | 23 | #include <linux/if_arp.h> |
1da177e4 LT |
24 | #include <linux/if_ether.h> |
25 | #include <linux/if_vlan.h> | |
516299d2 MM |
26 | #include <linux/if_pppox.h> |
27 | #include <linux/ppp_defs.h> | |
1da177e4 LT |
28 | #include <linux/netfilter_bridge.h> |
29 | #include <linux/netfilter_ipv4.h> | |
30 | #include <linux/netfilter_ipv6.h> | |
31 | #include <linux/netfilter_arp.h> | |
32 | #include <linux/in_route.h> | |
f216f082 | 33 | #include <linux/inetdevice.h> |
14c85021 | 34 | |
1da177e4 LT |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
14c85021 ACM |
37 | #include <net/route.h> |
38 | ||
1da177e4 | 39 | #include <asm/uaccess.h> |
1da177e4 LT |
40 | #include "br_private.h" |
41 | #ifdef CONFIG_SYSCTL | |
42 | #include <linux/sysctl.h> | |
43 | #endif | |
44 | ||
45 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
46 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
47 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
48 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 49 | |
1da177e4 LT |
50 | #ifdef CONFIG_SYSCTL |
51 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
52 | static int brnf_call_iptables __read_mostly = 1; |
53 | static int brnf_call_ip6tables __read_mostly = 1; | |
54 | static int brnf_call_arptables __read_mostly = 1; | |
47e0e1ca HX |
55 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
56 | static int brnf_filter_pppoe_tagged __read_mostly = 0; | |
4981682c | 57 | static int brnf_pass_vlan_indev __read_mostly = 0; |
1da177e4 | 58 | #else |
4df53d8b PM |
59 | #define brnf_call_iptables 1 |
60 | #define brnf_call_ip6tables 1 | |
61 | #define brnf_call_arptables 1 | |
47e0e1ca HX |
62 | #define brnf_filter_vlan_tagged 0 |
63 | #define brnf_filter_pppoe_tagged 0 | |
4981682c | 64 | #define brnf_pass_vlan_indev 0 |
1da177e4 LT |
65 | #endif |
66 | ||
739e4505 FW |
67 | #define IS_IP(skb) \ |
68 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) | |
69 | ||
70 | #define IS_IPV6(skb) \ | |
71 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) | |
72 | ||
73 | #define IS_ARP(skb) \ | |
74 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) | |
75 | ||
b6f99a21 | 76 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 | 77 | { |
13937911 JG |
78 | if (vlan_tx_tag_present(skb)) |
79 | return skb->protocol; | |
80 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
81 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
82 | else | |
83 | return 0; | |
8b42ec39 SH |
84 | } |
85 | ||
86 | #define IS_VLAN_IP(skb) \ | |
13937911 | 87 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
88 | brnf_filter_vlan_tagged) |
89 | ||
90 | #define IS_VLAN_IPV6(skb) \ | |
13937911 | 91 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
8b42ec39 SH |
92 | brnf_filter_vlan_tagged) |
93 | ||
94 | #define IS_VLAN_ARP(skb) \ | |
13937911 | 95 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
8b42ec39 | 96 | brnf_filter_vlan_tagged) |
1da177e4 | 97 | |
516299d2 MM |
98 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
99 | { | |
100 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
101 | sizeof(struct pppoe_hdr))); | |
102 | } | |
103 | ||
104 | #define IS_PPPOE_IP(skb) \ | |
105 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
106 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
107 | brnf_filter_pppoe_tagged) | |
108 | ||
109 | #define IS_PPPOE_IPV6(skb) \ | |
110 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
111 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
112 | brnf_filter_pppoe_tagged) | |
113 | ||
631339f1 HX |
114 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
115 | { | |
116 | } | |
117 | ||
6407d74c AH |
118 | static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old) |
119 | { | |
120 | return NULL; | |
121 | } | |
122 | ||
f894cbf8 DM |
123 | static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst, |
124 | struct sk_buff *skb, | |
125 | const void *daddr) | |
d3aaeb38 DM |
126 | { |
127 | return NULL; | |
128 | } | |
129 | ||
a13861a2 ED |
130 | static unsigned int fake_mtu(const struct dst_entry *dst) |
131 | { | |
132 | return dst->dev->mtu; | |
133 | } | |
134 | ||
631339f1 HX |
135 | static struct dst_ops fake_dst_ops = { |
136 | .family = AF_INET, | |
09640e63 | 137 | .protocol = cpu_to_be16(ETH_P_IP), |
631339f1 | 138 | .update_pmtu = fake_update_pmtu, |
6407d74c | 139 | .cow_metrics = fake_cow_metrics, |
d3aaeb38 | 140 | .neigh_lookup = fake_neigh_lookup, |
a13861a2 | 141 | .mtu = fake_mtu, |
631339f1 HX |
142 | }; |
143 | ||
4adf0af6 SW |
144 | /* |
145 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
146 | * Currently, we fill in the PMTU entry because netfilter |
147 | * refragmentation needs it, and the rt_flags entry because | |
148 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
149 | * require us to fill additional fields. |
150 | */ | |
33eb9873 ED |
151 | static const u32 br_dst_default_metrics[RTAX_MAX] = { |
152 | [RTAX_MTU - 1] = 1500, | |
153 | }; | |
154 | ||
4adf0af6 SW |
155 | void br_netfilter_rtable_init(struct net_bridge *br) |
156 | { | |
157 | struct rtable *rt = &br->fake_rtable; | |
158 | ||
d8d1f30b CG |
159 | atomic_set(&rt->dst.__refcnt, 1); |
160 | rt->dst.dev = br->dev; | |
161 | rt->dst.path = &rt->dst; | |
33eb9873 | 162 | dst_init_metrics(&rt->dst, br_dst_default_metrics, true); |
a881e963 | 163 | rt->dst.flags = DST_NOXFRM | DST_NOPEER | DST_FAKE_RTABLE; |
d8d1f30b | 164 | rt->dst.ops = &fake_dst_ops; |
4adf0af6 SW |
165 | } |
166 | ||
167 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
168 | { | |
b5ed54e9 | 169 | struct net_bridge_port *port; |
170 | ||
171 | port = br_port_get_rcu(dev); | |
172 | return port ? &port->br->fake_rtable : NULL; | |
4adf0af6 | 173 | } |
1da177e4 | 174 | |
5dce971a SH |
175 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
176 | { | |
b5ed54e9 | 177 | struct net_bridge_port *port; |
5dce971a | 178 | |
b5ed54e9 | 179 | port = br_port_get_rcu(dev); |
180 | return port ? port->br->dev : NULL; | |
5dce971a | 181 | } |
1da177e4 | 182 | |
fdeabdef SH |
183 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
184 | { | |
185 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
186 | if (likely(skb->nf_bridge)) | |
187 | atomic_set(&(skb->nf_bridge->use), 1); | |
188 | ||
189 | return skb->nf_bridge; | |
190 | } | |
191 | ||
2dc2f207 PM |
192 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
193 | { | |
194 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
195 | ||
196 | if (atomic_read(&nf_bridge->use) > 1) { | |
197 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
198 | ||
199 | if (tmp) { | |
200 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
201 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 202 | } |
4c3a76ab | 203 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
204 | nf_bridge = tmp; |
205 | } | |
206 | return nf_bridge; | |
207 | } | |
208 | ||
fc38582d PM |
209 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
210 | { | |
211 | unsigned int len = nf_bridge_encap_header_len(skb); | |
212 | ||
213 | skb_push(skb, len); | |
214 | skb->network_header -= len; | |
215 | } | |
216 | ||
217 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 218 | { |
fc38582d PM |
219 | unsigned int len = nf_bridge_encap_header_len(skb); |
220 | ||
221 | skb_pull(skb, len); | |
222 | skb->network_header += len; | |
223 | } | |
fdeabdef | 224 | |
fc38582d PM |
225 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
226 | { | |
227 | unsigned int len = nf_bridge_encap_header_len(skb); | |
228 | ||
229 | skb_pull_rcsum(skb, len); | |
230 | skb->network_header += len; | |
231 | } | |
232 | ||
233 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
234 | { | |
235 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 236 | |
d626f62b ACM |
237 | skb_copy_from_linear_data_offset(skb, -header_size, |
238 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
239 | } |
240 | ||
e179e632 BDS |
241 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
242 | { | |
243 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
244 | skb->protocol = htons(ETH_P_8021Q); | |
245 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
246 | skb->protocol = htons(ETH_P_PPP_SES); | |
247 | } | |
248 | ||
462fb2af BD |
249 | /* When handing a packet over to the IP layer |
250 | * check whether we have a skb that is in the | |
251 | * expected format | |
252 | */ | |
253 | ||
d0280232 | 254 | static int br_parse_ip_options(struct sk_buff *skb) |
462fb2af BD |
255 | { |
256 | struct ip_options *opt; | |
b71d1d42 | 257 | const struct iphdr *iph; |
462fb2af BD |
258 | struct net_device *dev = skb->dev; |
259 | u32 len; | |
260 | ||
261 | iph = ip_hdr(skb); | |
262 | opt = &(IPCB(skb)->opt); | |
263 | ||
264 | /* Basic sanity checks */ | |
265 | if (iph->ihl < 5 || iph->version != 4) | |
266 | goto inhdr_error; | |
267 | ||
268 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
269 | goto inhdr_error; | |
270 | ||
271 | iph = ip_hdr(skb); | |
272 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
273 | goto inhdr_error; | |
274 | ||
275 | len = ntohs(iph->tot_len); | |
276 | if (skb->len < len) { | |
277 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
278 | goto drop; | |
279 | } else if (len < (iph->ihl*4)) | |
280 | goto inhdr_error; | |
281 | ||
282 | if (pskb_trim_rcsum(skb, len)) { | |
283 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
284 | goto drop; | |
285 | } | |
286 | ||
f8e9881c ED |
287 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
288 | if (iph->ihl == 5) | |
462fb2af | 289 | return 0; |
462fb2af BD |
290 | |
291 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
292 | if (ip_options_compile(dev_net(dev), opt, skb)) | |
293 | goto inhdr_error; | |
294 | ||
295 | /* Check correct handling of SRR option */ | |
296 | if (unlikely(opt->srr)) { | |
297 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
298 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) | |
299 | goto drop; | |
300 | ||
301 | if (ip_options_rcv_srr(skb)) | |
302 | goto drop; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | ||
307 | inhdr_error: | |
308 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
309 | drop: | |
310 | return -1; | |
311 | } | |
312 | ||
e179e632 BDS |
313 | /* Fill in the header for fragmented IP packets handled by |
314 | * the IPv4 connection tracking code. | |
07317621 SH |
315 | */ |
316 | int nf_bridge_copy_header(struct sk_buff *skb) | |
317 | { | |
318 | int err; | |
e179e632 | 319 | unsigned int header_size; |
07317621 | 320 | |
e179e632 BDS |
321 | nf_bridge_update_protocol(skb); |
322 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 323 | err = skb_cow_head(skb, header_size); |
07317621 SH |
324 | if (err) |
325 | return err; | |
326 | ||
27d7ff46 ACM |
327 | skb_copy_to_linear_data_offset(skb, -header_size, |
328 | skb->nf_bridge->data, header_size); | |
fc38582d | 329 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
330 | return 0; |
331 | } | |
332 | ||
1da177e4 LT |
333 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
334 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
335 | * bridge PRE_ROUTING hook. */ | |
336 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
337 | { | |
338 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 339 | struct rtable *rt; |
1da177e4 | 340 | |
1da177e4 LT |
341 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
342 | skb->pkt_type = PACKET_OTHERHOST; | |
343 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
344 | } | |
345 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
346 | ||
511c3f92 ED |
347 | rt = bridge_parent_rtable(nf_bridge->physindev); |
348 | if (!rt) { | |
4adf0af6 SW |
349 | kfree_skb(skb); |
350 | return 0; | |
351 | } | |
f9181f4f | 352 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
353 | |
354 | skb->dev = nf_bridge->physindev; | |
e179e632 | 355 | nf_bridge_update_protocol(skb); |
fc38582d | 356 | nf_bridge_push_encap_header(skb); |
713aefa3 | 357 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
358 | br_handle_frame_finish, 1); |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
e179e632 BDS |
363 | /* Obtain the correct destination MAC address, while preserving the original |
364 | * source MAC address. If we already know this address, we just copy it. If we | |
365 | * don't, we use the neighbour framework to find out. In both cases, we make | |
366 | * sure that br_handle_frame_finish() is called afterwards. | |
367 | */ | |
368 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
369 | { | |
370 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
f6b72b62 | 371 | struct neighbour *neigh; |
e179e632 BDS |
372 | struct dst_entry *dst; |
373 | ||
374 | skb->dev = bridge_parent(skb->dev); | |
375 | if (!skb->dev) | |
376 | goto free_skb; | |
377 | dst = skb_dst(skb); | |
27217455 | 378 | neigh = dst_get_neighbour_noref(dst); |
f6b72b62 DM |
379 | if (neigh->hh.hh_len) { |
380 | neigh_hh_bridge(&neigh->hh, skb); | |
e179e632 BDS |
381 | skb->dev = nf_bridge->physindev; |
382 | return br_handle_frame_finish(skb); | |
8f40b161 | 383 | } else { |
e179e632 BDS |
384 | /* the neighbour function below overwrites the complete |
385 | * MAC header, so we save the Ethernet source address and | |
386 | * protocol number. */ | |
387 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
388 | /* tell br_dev_xmit to continue with forwarding */ | |
389 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
8f40b161 | 390 | return neigh->output(neigh, skb); |
e179e632 BDS |
391 | } |
392 | free_skb: | |
393 | kfree_skb(skb); | |
394 | return 0; | |
395 | } | |
396 | ||
1da177e4 | 397 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 398 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
399 | * |
400 | * There are two cases to consider: | |
401 | * 1. The packet was DNAT'ed to a device in the same bridge | |
402 | * port group as it was received on. We can still bridge | |
403 | * the packet. | |
404 | * 2. The packet was DNAT'ed to a different device, either | |
405 | * a non-bridged device or another bridge port group. | |
406 | * The packet will need to be routed. | |
407 | * | |
408 | * The correct way of distinguishing between these two cases is to | |
409 | * call ip_route_input() and to look at skb->dst->dev, which is | |
410 | * changed to the destination device if ip_route_input() succeeds. | |
411 | * | |
ea2d9b41 | 412 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 413 | * |
ea2d9b41 BDS |
414 | * If the output device equals the logical bridge device the packet |
415 | * came in on, we can consider this bridging. The corresponding MAC | |
416 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
417 | * Otherwise, the packet is considered to be routed and we just |
418 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
419 | * later be passed up to the IP stack to be routed. For a redirected |
420 | * packet, ip_route_input() will give back the localhost as output device, | |
421 | * which differs from the bridge device. | |
1da177e4 | 422 | * |
ea2d9b41 | 423 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 424 | * |
f216f082 BDS |
425 | * This can be because the destination address is martian, in which case |
426 | * the packet will be dropped. | |
ea2d9b41 BDS |
427 | * If IP forwarding is disabled, ip_route_input() will fail, while |
428 | * ip_route_output_key() can return success. The source | |
429 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 430 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
431 | * if IP forwarding is enabled. If the output device equals the logical bridge |
432 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
433 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
434 | */ | |
1da177e4 LT |
435 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
436 | { | |
437 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 438 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 439 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 440 | struct rtable *rt; |
f216f082 | 441 | int err; |
1da177e4 | 442 | |
1da177e4 LT |
443 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
444 | skb->pkt_type = PACKET_OTHERHOST; | |
445 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
446 | } | |
447 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 448 | if (dnat_took_place(skb)) { |
f216f082 | 449 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 450 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
451 | |
452 | /* If err equals -EHOSTUNREACH the error is due to a | |
453 | * martian destination or due to the fact that | |
454 | * forwarding is disabled. For most martian packets, | |
455 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
456 | * martian destinations: loopback destinations and destination | |
457 | * 0.0.0.0. In both cases the packet will be dropped because the | |
458 | * destination is the loopback device and not the bridge. */ | |
459 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
460 | goto free_skb; | |
1da177e4 | 461 | |
78fbfd8a DM |
462 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
463 | RT_TOS(iph->tos), 0); | |
b23dd4fe | 464 | if (!IS_ERR(rt)) { |
1c011bed | 465 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 466 | * require ip_forwarding. */ |
b23dd4fe DM |
467 | if (rt->dst.dev == dev) { |
468 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
469 | goto bridged_dnat; |
470 | } | |
b23dd4fe | 471 | ip_rt_put(rt); |
1da177e4 | 472 | } |
f216f082 | 473 | free_skb: |
1da177e4 LT |
474 | kfree_skb(skb); |
475 | return 0; | |
476 | } else { | |
adf30907 | 477 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 478 | bridged_dnat: |
1da177e4 | 479 | skb->dev = nf_bridge->physindev; |
e179e632 | 480 | nf_bridge_update_protocol(skb); |
fc38582d | 481 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
482 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
483 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
484 | skb, skb->dev, NULL, |
485 | br_nf_pre_routing_finish_bridge, | |
486 | 1); | |
487 | return 0; | |
488 | } | |
789bc3e5 | 489 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
490 | skb->pkt_type = PACKET_HOST; |
491 | } | |
492 | } else { | |
511c3f92 ED |
493 | rt = bridge_parent_rtable(nf_bridge->physindev); |
494 | if (!rt) { | |
4adf0af6 SW |
495 | kfree_skb(skb); |
496 | return 0; | |
497 | } | |
f9181f4f | 498 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
499 | } |
500 | ||
501 | skb->dev = nf_bridge->physindev; | |
e179e632 | 502 | nf_bridge_update_protocol(skb); |
fc38582d | 503 | nf_bridge_push_encap_header(skb); |
713aefa3 | 504 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
505 | br_handle_frame_finish, 1); |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
4981682c PNA |
510 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
511 | { | |
512 | struct net_device *vlan, *br; | |
513 | ||
514 | br = bridge_parent(dev); | |
515 | if (brnf_pass_vlan_indev == 0 || !vlan_tx_tag_present(skb)) | |
516 | return br; | |
517 | ||
518 | vlan = __vlan_find_dev_deep(br, vlan_tx_tag_get(skb) & VLAN_VID_MASK); | |
519 | ||
520 | return vlan ? vlan : br; | |
521 | } | |
522 | ||
1da177e4 | 523 | /* Some common code for IPv4/IPv6 */ |
5dce971a | 524 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
525 | { |
526 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
527 | ||
528 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
529 | skb->pkt_type = PACKET_HOST; | |
530 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
531 | } | |
532 | ||
533 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
534 | nf_bridge->physindev = skb->dev; | |
4981682c | 535 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
e179e632 BDS |
536 | if (skb->protocol == htons(ETH_P_8021Q)) |
537 | nf_bridge->mask |= BRNF_8021Q; | |
538 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
539 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
540 | |
541 | return skb->dev; | |
1da177e4 LT |
542 | } |
543 | ||
544 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
545 | static int check_hbh_len(struct sk_buff *skb) | |
546 | { | |
0660e03f | 547 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 548 | u32 pkt_len; |
d56f90a7 ACM |
549 | const unsigned char *nh = skb_network_header(skb); |
550 | int off = raw - nh; | |
789bc3e5 | 551 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
552 | |
553 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
554 | goto bad; | |
555 | ||
556 | off += 2; | |
557 | len -= 2; | |
558 | ||
559 | while (len > 0) { | |
d56f90a7 | 560 | int optlen = nh[off + 1] + 2; |
1da177e4 | 561 | |
d56f90a7 | 562 | switch (nh[off]) { |
1de5a71c | 563 | case IPV6_TLV_PAD1: |
1da177e4 LT |
564 | optlen = 1; |
565 | break; | |
566 | ||
567 | case IPV6_TLV_PADN: | |
568 | break; | |
569 | ||
570 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 571 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 572 | goto bad; |
d56f90a7 | 573 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 574 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 575 | ipv6_hdr(skb)->payload_len) |
b0366486 | 576 | goto bad; |
1da177e4 LT |
577 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
578 | goto bad; | |
b0366486 | 579 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 580 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 581 | goto bad; |
d56f90a7 | 582 | nh = skb_network_header(skb); |
1da177e4 LT |
583 | break; |
584 | default: | |
585 | if (optlen > len) | |
586 | goto bad; | |
587 | break; | |
588 | } | |
589 | off += optlen; | |
590 | len -= optlen; | |
591 | } | |
592 | if (len == 0) | |
593 | return 0; | |
594 | bad: | |
595 | return -1; | |
596 | ||
597 | } | |
598 | ||
599 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
600 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
601 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
602 | struct sk_buff *skb, |
603 | const struct net_device *in, | |
604 | const struct net_device *out, | |
605 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 606 | { |
b71d1d42 | 607 | const struct ipv6hdr *hdr; |
1da177e4 | 608 | u32 pkt_len; |
1da177e4 LT |
609 | |
610 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 611 | return NF_DROP; |
1da177e4 LT |
612 | |
613 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 614 | return NF_DROP; |
1da177e4 | 615 | |
0660e03f | 616 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
617 | |
618 | if (hdr->version != 6) | |
deef4b52 | 619 | return NF_DROP; |
1da177e4 LT |
620 | |
621 | pkt_len = ntohs(hdr->payload_len); | |
622 | ||
623 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
624 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 625 | return NF_DROP; |
b38dfee3 | 626 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 627 | return NF_DROP; |
1da177e4 LT |
628 | } |
629 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 630 | return NF_DROP; |
1da177e4 | 631 | |
789bc3e5 | 632 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 633 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 634 | return NF_DROP; |
5dce971a SH |
635 | if (!setup_pre_routing(skb)) |
636 | return NF_DROP; | |
1da177e4 | 637 | |
e179e632 | 638 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 639 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
640 | br_nf_pre_routing_finish_ipv6); |
641 | ||
642 | return NF_STOLEN; | |
1da177e4 LT |
643 | } |
644 | ||
645 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
646 | * Replicate the checks that IPv4 does on packet reception. | |
647 | * Set skb->dev to the bridge device (i.e. parent of the | |
648 | * receiving device) to make netfilter happy, the REDIRECT | |
649 | * target in particular. Save the original destination IP | |
650 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 651 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
652 | const struct net_device *in, |
653 | const struct net_device *out, | |
654 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 655 | { |
4df53d8b PM |
656 | struct net_bridge_port *p; |
657 | struct net_bridge *br; | |
e7c243c9 EP |
658 | __u32 len = nf_bridge_encap_header_len(skb); |
659 | ||
e7c243c9 | 660 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 661 | return NF_DROP; |
1da177e4 | 662 | |
e490c1de | 663 | p = br_port_get_rcu(in); |
4df53d8b | 664 | if (p == NULL) |
deef4b52 | 665 | return NF_DROP; |
4df53d8b PM |
666 | br = p->br; |
667 | ||
739e4505 | 668 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
4df53d8b | 669 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 670 | return NF_ACCEPT; |
4df53d8b | 671 | |
fc38582d | 672 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
673 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
674 | } | |
4df53d8b PM |
675 | |
676 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 677 | return NF_ACCEPT; |
1da177e4 | 678 | |
739e4505 | 679 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
1da177e4 LT |
680 | return NF_ACCEPT; |
681 | ||
fc38582d | 682 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 683 | |
462fb2af | 684 | if (br_parse_ip_options(skb)) |
deef4b52 | 685 | return NF_DROP; |
17762060 | 686 | |
789bc3e5 | 687 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 688 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 689 | return NF_DROP; |
5dce971a SH |
690 | if (!setup_pre_routing(skb)) |
691 | return NF_DROP; | |
1da177e4 | 692 | store_orig_dstaddr(skb); |
e179e632 | 693 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 694 | |
713aefa3 | 695 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
696 | br_nf_pre_routing_finish); |
697 | ||
698 | return NF_STOLEN; | |
1da177e4 LT |
699 | } |
700 | ||
701 | ||
702 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
703 | /* The packet is locally destined, which requires a real | |
704 | * dst_entry, so detach the fake one. On the way up, the | |
705 | * packet would pass through PRE_ROUTING again (which already | |
706 | * took place when the packet entered the bridge), but we | |
707 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
708 | * prevent this from happening. */ | |
3db05fea | 709 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
710 | const struct net_device *in, |
711 | const struct net_device *out, | |
712 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 713 | { |
a881e963 | 714 | br_drop_fake_rtable(skb); |
1da177e4 LT |
715 | return NF_ACCEPT; |
716 | } | |
717 | ||
1da177e4 LT |
718 | /* PF_BRIDGE/FORWARD *************************************************/ |
719 | static int br_nf_forward_finish(struct sk_buff *skb) | |
720 | { | |
721 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
722 | struct net_device *in; | |
1da177e4 | 723 | |
739e4505 | 724 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
725 | in = nf_bridge->physindev; |
726 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
727 | skb->pkt_type = PACKET_OTHERHOST; | |
728 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
729 | } | |
e94c6743 | 730 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
731 | } else { |
732 | in = *((struct net_device **)(skb->cb)); | |
733 | } | |
fc38582d | 734 | nf_bridge_push_encap_header(skb); |
e179e632 | 735 | |
713aefa3 | 736 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 737 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
738 | return 0; |
739 | } | |
740 | ||
739e4505 | 741 | |
1da177e4 LT |
742 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
743 | * netfilter with indev and outdev set to the bridge device, | |
744 | * but we are still able to filter on the 'real' indev/outdev | |
745 | * because of the physdev module. For ARP, indev and outdev are the | |
746 | * bridge ports. */ | |
3db05fea | 747 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
748 | const struct net_device *in, |
749 | const struct net_device *out, | |
750 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 751 | { |
1da177e4 | 752 | struct nf_bridge_info *nf_bridge; |
5dce971a | 753 | struct net_device *parent; |
76108cea | 754 | u_int8_t pf; |
1da177e4 LT |
755 | |
756 | if (!skb->nf_bridge) | |
757 | return NF_ACCEPT; | |
758 | ||
2dc2f207 PM |
759 | /* Need exclusive nf_bridge_info since we might have multiple |
760 | * different physoutdevs. */ | |
761 | if (!nf_bridge_unshare(skb)) | |
762 | return NF_DROP; | |
763 | ||
5dce971a SH |
764 | parent = bridge_parent(out); |
765 | if (!parent) | |
766 | return NF_DROP; | |
767 | ||
739e4505 | 768 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 769 | pf = NFPROTO_IPV4; |
739e4505 | 770 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 771 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
772 | else |
773 | return NF_ACCEPT; | |
1da177e4 | 774 | |
3db05fea | 775 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 776 | |
1da177e4 LT |
777 | nf_bridge = skb->nf_bridge; |
778 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
779 | skb->pkt_type = PACKET_HOST; | |
780 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
781 | } | |
782 | ||
aa740f46 | 783 | if (pf == NFPROTO_IPV4 && br_parse_ip_options(skb)) |
6b1e960f HX |
784 | return NF_DROP; |
785 | ||
1da177e4 LT |
786 | /* The physdev module checks on this */ |
787 | nf_bridge->mask |= BRNF_BRIDGED; | |
788 | nf_bridge->physoutdev = skb->dev; | |
aa740f46 | 789 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
790 | skb->protocol = htons(ETH_P_IP); |
791 | else | |
792 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 793 | |
4981682c | 794 | NF_HOOK(pf, NF_INET_FORWARD, skb, brnf_get_logical_dev(skb, in), parent, |
5dce971a | 795 | br_nf_forward_finish); |
1da177e4 LT |
796 | |
797 | return NF_STOLEN; | |
798 | } | |
799 | ||
3db05fea | 800 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
801 | const struct net_device *in, |
802 | const struct net_device *out, | |
803 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 804 | { |
4df53d8b PM |
805 | struct net_bridge_port *p; |
806 | struct net_bridge *br; | |
1da177e4 LT |
807 | struct net_device **d = (struct net_device **)(skb->cb); |
808 | ||
e490c1de | 809 | p = br_port_get_rcu(out); |
4df53d8b PM |
810 | if (p == NULL) |
811 | return NF_ACCEPT; | |
812 | br = p->br; | |
813 | ||
814 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 815 | return NF_ACCEPT; |
1da177e4 | 816 | |
739e4505 | 817 | if (!IS_ARP(skb)) { |
8b42ec39 | 818 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 819 | return NF_ACCEPT; |
3db05fea | 820 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
821 | } |
822 | ||
d0a92be0 | 823 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 824 | if (IS_VLAN_ARP(skb)) |
3db05fea | 825 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
826 | return NF_ACCEPT; |
827 | } | |
828 | *d = (struct net_device *)in; | |
fdc9314c | 829 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
830 | (struct net_device *)out, br_nf_forward_finish); |
831 | ||
832 | return NF_STOLEN; | |
833 | } | |
834 | ||
e6373c4c | 835 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV4) |
2e2f7aef PM |
836 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
837 | { | |
462fb2af BD |
838 | int ret; |
839 | ||
e179e632 | 840 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 841 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 842 | !skb_is_gso(skb)) { |
462fb2af BD |
843 | if (br_parse_ip_options(skb)) |
844 | /* Drop invalid packet */ | |
845 | return NF_DROP; | |
846 | ret = ip_fragment(skb, br_dev_queue_push_xmit); | |
87f94b4e | 847 | } else |
462fb2af BD |
848 | ret = br_dev_queue_push_xmit(skb); |
849 | ||
850 | return ret; | |
2e2f7aef | 851 | } |
c197facc | 852 | #else |
853 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
854 | { | |
855 | return br_dev_queue_push_xmit(skb); | |
856 | } | |
857 | #endif | |
1da177e4 LT |
858 | |
859 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 860 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
861 | const struct net_device *in, |
862 | const struct net_device *out, | |
863 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 864 | { |
3db05fea | 865 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 866 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 867 | u_int8_t pf; |
1da177e4 | 868 | |
ea2d9b41 | 869 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
870 | return NF_ACCEPT; |
871 | ||
5dce971a SH |
872 | if (!realoutdev) |
873 | return NF_DROP; | |
874 | ||
739e4505 | 875 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 876 | pf = NFPROTO_IPV4; |
739e4505 | 877 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 878 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
879 | else |
880 | return NF_ACCEPT; | |
1da177e4 | 881 | |
1da177e4 LT |
882 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
883 | * about the value of skb->pkt_type. */ | |
884 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
885 | skb->pkt_type = PACKET_HOST; | |
886 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
887 | } | |
888 | ||
fc38582d | 889 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 890 | nf_bridge_save_header(skb); |
aa740f46 | 891 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
892 | skb->protocol = htons(ETH_P_IP); |
893 | else | |
894 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 895 | |
6e23ae2a | 896 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 897 | br_nf_dev_queue_xmit); |
1da177e4 LT |
898 | |
899 | return NF_STOLEN; | |
1da177e4 LT |
900 | } |
901 | ||
1da177e4 LT |
902 | /* IP/SABOTAGE *****************************************************/ |
903 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
904 | * for the second time. */ | |
3db05fea | 905 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
906 | const struct net_device *in, |
907 | const struct net_device *out, | |
908 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 909 | { |
3db05fea HX |
910 | if (skb->nf_bridge && |
911 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
912 | return NF_STOP; |
913 | } | |
914 | ||
915 | return NF_ACCEPT; | |
916 | } | |
917 | ||
ea2d9b41 BDS |
918 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
919 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 920 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
921 | { |
922 | .hook = br_nf_pre_routing, | |
923 | .owner = THIS_MODULE, | |
aa740f46 | 924 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
925 | .hooknum = NF_BR_PRE_ROUTING, |
926 | .priority = NF_BR_PRI_BRNF, | |
927 | }, | |
928 | { | |
929 | .hook = br_nf_local_in, | |
930 | .owner = THIS_MODULE, | |
aa740f46 | 931 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
932 | .hooknum = NF_BR_LOCAL_IN, |
933 | .priority = NF_BR_PRI_BRNF, | |
934 | }, | |
935 | { | |
936 | .hook = br_nf_forward_ip, | |
937 | .owner = THIS_MODULE, | |
aa740f46 | 938 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
939 | .hooknum = NF_BR_FORWARD, |
940 | .priority = NF_BR_PRI_BRNF - 1, | |
941 | }, | |
942 | { | |
943 | .hook = br_nf_forward_arp, | |
944 | .owner = THIS_MODULE, | |
aa740f46 | 945 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
946 | .hooknum = NF_BR_FORWARD, |
947 | .priority = NF_BR_PRI_BRNF, | |
948 | }, | |
1490fd89 CG |
949 | { |
950 | .hook = br_nf_post_routing, | |
951 | .owner = THIS_MODULE, | |
aa740f46 | 952 | .pf = NFPROTO_BRIDGE, |
1490fd89 CG |
953 | .hooknum = NF_BR_POST_ROUTING, |
954 | .priority = NF_BR_PRI_LAST, | |
955 | }, | |
956 | { | |
957 | .hook = ip_sabotage_in, | |
958 | .owner = THIS_MODULE, | |
aa740f46 | 959 | .pf = NFPROTO_IPV4, |
1490fd89 CG |
960 | .hooknum = NF_INET_PRE_ROUTING, |
961 | .priority = NF_IP_PRI_FIRST, | |
962 | }, | |
963 | { | |
964 | .hook = ip_sabotage_in, | |
965 | .owner = THIS_MODULE, | |
aa740f46 | 966 | .pf = NFPROTO_IPV6, |
1490fd89 CG |
967 | .hooknum = NF_INET_PRE_ROUTING, |
968 | .priority = NF_IP6_PRI_FIRST, | |
969 | }, | |
1da177e4 LT |
970 | }; |
971 | ||
972 | #ifdef CONFIG_SYSCTL | |
973 | static | |
8d65af78 | 974 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 975 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
976 | { |
977 | int ret; | |
978 | ||
8d65af78 | 979 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
980 | |
981 | if (write && *(int *)(ctl->data)) | |
982 | *(int *)(ctl->data) = 1; | |
983 | return ret; | |
984 | } | |
985 | ||
986 | static ctl_table brnf_table[] = { | |
987 | { | |
1da177e4 LT |
988 | .procname = "bridge-nf-call-arptables", |
989 | .data = &brnf_call_arptables, | |
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-iptables", |
996 | .data = &brnf_call_iptables, | |
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-call-ip6tables", |
1003 | .data = &brnf_call_ip6tables, | |
1004 | .maxlen = sizeof(int), | |
1005 | .mode = 0644, | |
6d9f239a | 1006 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
1007 | }, |
1008 | { | |
1da177e4 LT |
1009 | .procname = "bridge-nf-filter-vlan-tagged", |
1010 | .data = &brnf_filter_vlan_tagged, | |
1011 | .maxlen = sizeof(int), | |
1012 | .mode = 0644, | |
6d9f239a | 1013 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
1014 | }, |
1015 | { | |
516299d2 MM |
1016 | .procname = "bridge-nf-filter-pppoe-tagged", |
1017 | .data = &brnf_filter_pppoe_tagged, | |
1018 | .maxlen = sizeof(int), | |
1019 | .mode = 0644, | |
6d9f239a | 1020 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 1021 | }, |
4981682c PNA |
1022 | { |
1023 | .procname = "bridge-nf-pass-vlan-input-dev", | |
1024 | .data = &brnf_pass_vlan_indev, | |
1025 | .maxlen = sizeof(int), | |
1026 | .mode = 0644, | |
1027 | .proc_handler = brnf_sysctl_call_tables, | |
1028 | }, | |
f8572d8f | 1029 | { } |
1da177e4 | 1030 | }; |
1da177e4 LT |
1031 | #endif |
1032 | ||
5eb87f45 | 1033 | int __init br_netfilter_init(void) |
1da177e4 | 1034 | { |
5eb87f45 | 1035 | int ret; |
1da177e4 | 1036 | |
fc66f95c | 1037 | ret = dst_entries_init(&fake_dst_ops); |
5eb87f45 | 1038 | if (ret < 0) |
1da177e4 | 1039 | return ret; |
fc66f95c ED |
1040 | |
1041 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
1042 | if (ret < 0) { | |
1043 | dst_entries_destroy(&fake_dst_ops); | |
1044 | return ret; | |
1045 | } | |
1da177e4 | 1046 | #ifdef CONFIG_SYSCTL |
ec8f23ce | 1047 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
1da177e4 | 1048 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1049 | printk(KERN_WARNING |
1050 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 | 1051 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
fc66f95c | 1052 | dst_entries_destroy(&fake_dst_ops); |
5eb87f45 | 1053 | return -ENOMEM; |
1da177e4 LT |
1054 | } |
1055 | #endif | |
1da177e4 | 1056 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1057 | return 0; |
1058 | } | |
1059 | ||
1060 | void br_netfilter_fini(void) | |
1061 | { | |
5eb87f45 | 1062 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 | 1063 | #ifdef CONFIG_SYSCTL |
5dd3df10 | 1064 | unregister_net_sysctl_table(brnf_sysctl_header); |
1da177e4 | 1065 | #endif |
fc66f95c | 1066 | dst_entries_destroy(&fake_dst_ops); |
1da177e4 | 1067 | } |