Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
8237908e BDS |
6 | * Lennert Buytenhek <buytenh@gnu.org> |
7 | * Bart De Schuymer <bdschuym@pandora.be> | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Lennert dedicates this file to Kerstin Wurdinger. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/ip.h> |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/skbuff.h> | |
14c85021 | 23 | #include <linux/if_arp.h> |
1da177e4 LT |
24 | #include <linux/if_ether.h> |
25 | #include <linux/if_vlan.h> | |
516299d2 MM |
26 | #include <linux/if_pppox.h> |
27 | #include <linux/ppp_defs.h> | |
1da177e4 LT |
28 | #include <linux/netfilter_bridge.h> |
29 | #include <linux/netfilter_ipv4.h> | |
30 | #include <linux/netfilter_ipv6.h> | |
31 | #include <linux/netfilter_arp.h> | |
32 | #include <linux/in_route.h> | |
f216f082 | 33 | #include <linux/inetdevice.h> |
14c85021 | 34 | |
1da177e4 LT |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
14c85021 ACM |
37 | #include <net/route.h> |
38 | ||
1da177e4 | 39 | #include <asm/uaccess.h> |
1da177e4 LT |
40 | #include "br_private.h" |
41 | #ifdef CONFIG_SYSCTL | |
42 | #include <linux/sysctl.h> | |
43 | #endif | |
44 | ||
45 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
46 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
47 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
48 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 49 | |
1da177e4 LT |
50 | #ifdef CONFIG_SYSCTL |
51 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
52 | static int brnf_call_iptables __read_mostly = 1; |
53 | static int brnf_call_ip6tables __read_mostly = 1; | |
54 | static int brnf_call_arptables __read_mostly = 1; | |
47e0e1ca HX |
55 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
56 | static int brnf_filter_pppoe_tagged __read_mostly = 0; | |
4981682c | 57 | static int brnf_pass_vlan_indev __read_mostly = 0; |
1da177e4 | 58 | #else |
4df53d8b PM |
59 | #define brnf_call_iptables 1 |
60 | #define brnf_call_ip6tables 1 | |
61 | #define brnf_call_arptables 1 | |
47e0e1ca HX |
62 | #define brnf_filter_vlan_tagged 0 |
63 | #define brnf_filter_pppoe_tagged 0 | |
4981682c | 64 | #define brnf_pass_vlan_indev 0 |
1da177e4 LT |
65 | #endif |
66 | ||
739e4505 FW |
67 | #define IS_IP(skb) \ |
68 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) | |
69 | ||
70 | #define IS_IPV6(skb) \ | |
71 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) | |
72 | ||
73 | #define IS_ARP(skb) \ | |
74 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) | |
75 | ||
b6f99a21 | 76 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 | 77 | { |
13937911 JG |
78 | if (vlan_tx_tag_present(skb)) |
79 | return skb->protocol; | |
80 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
81 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
82 | else | |
83 | return 0; | |
8b42ec39 SH |
84 | } |
85 | ||
86 | #define IS_VLAN_IP(skb) \ | |
13937911 | 87 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
88 | brnf_filter_vlan_tagged) |
89 | ||
90 | #define IS_VLAN_IPV6(skb) \ | |
13937911 | 91 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
8b42ec39 SH |
92 | brnf_filter_vlan_tagged) |
93 | ||
94 | #define IS_VLAN_ARP(skb) \ | |
13937911 | 95 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
8b42ec39 | 96 | brnf_filter_vlan_tagged) |
1da177e4 | 97 | |
516299d2 MM |
98 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
99 | { | |
100 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
101 | sizeof(struct pppoe_hdr))); | |
102 | } | |
103 | ||
104 | #define IS_PPPOE_IP(skb) \ | |
105 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
106 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
107 | brnf_filter_pppoe_tagged) | |
108 | ||
109 | #define IS_PPPOE_IPV6(skb) \ | |
110 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
111 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
112 | brnf_filter_pppoe_tagged) | |
113 | ||
6700c270 DM |
114 | static void fake_update_pmtu(struct dst_entry *dst, struct sock *sk, |
115 | struct sk_buff *skb, u32 mtu) | |
631339f1 HX |
116 | { |
117 | } | |
118 | ||
6700c270 DM |
119 | static void fake_redirect(struct dst_entry *dst, struct sock *sk, |
120 | struct sk_buff *skb) | |
b587ee3b DM |
121 | { |
122 | } | |
123 | ||
6407d74c AH |
124 | static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old) |
125 | { | |
126 | return NULL; | |
127 | } | |
128 | ||
f894cbf8 DM |
129 | static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst, |
130 | struct sk_buff *skb, | |
131 | const void *daddr) | |
d3aaeb38 DM |
132 | { |
133 | return NULL; | |
134 | } | |
135 | ||
a13861a2 ED |
136 | static unsigned int fake_mtu(const struct dst_entry *dst) |
137 | { | |
138 | return dst->dev->mtu; | |
139 | } | |
140 | ||
631339f1 HX |
141 | static struct dst_ops fake_dst_ops = { |
142 | .family = AF_INET, | |
09640e63 | 143 | .protocol = cpu_to_be16(ETH_P_IP), |
631339f1 | 144 | .update_pmtu = fake_update_pmtu, |
b587ee3b | 145 | .redirect = fake_redirect, |
6407d74c | 146 | .cow_metrics = fake_cow_metrics, |
d3aaeb38 | 147 | .neigh_lookup = fake_neigh_lookup, |
a13861a2 | 148 | .mtu = fake_mtu, |
631339f1 HX |
149 | }; |
150 | ||
4adf0af6 SW |
151 | /* |
152 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
153 | * Currently, we fill in the PMTU entry because netfilter |
154 | * refragmentation needs it, and the rt_flags entry because | |
155 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
156 | * require us to fill additional fields. |
157 | */ | |
33eb9873 ED |
158 | static const u32 br_dst_default_metrics[RTAX_MAX] = { |
159 | [RTAX_MTU - 1] = 1500, | |
160 | }; | |
161 | ||
4adf0af6 SW |
162 | void br_netfilter_rtable_init(struct net_bridge *br) |
163 | { | |
164 | struct rtable *rt = &br->fake_rtable; | |
165 | ||
d8d1f30b CG |
166 | atomic_set(&rt->dst.__refcnt, 1); |
167 | rt->dst.dev = br->dev; | |
168 | rt->dst.path = &rt->dst; | |
33eb9873 | 169 | dst_init_metrics(&rt->dst, br_dst_default_metrics, true); |
a881e963 | 170 | rt->dst.flags = DST_NOXFRM | DST_NOPEER | DST_FAKE_RTABLE; |
d8d1f30b | 171 | rt->dst.ops = &fake_dst_ops; |
4adf0af6 SW |
172 | } |
173 | ||
174 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
175 | { | |
b5ed54e9 | 176 | struct net_bridge_port *port; |
177 | ||
178 | port = br_port_get_rcu(dev); | |
179 | return port ? &port->br->fake_rtable : NULL; | |
4adf0af6 | 180 | } |
1da177e4 | 181 | |
5dce971a SH |
182 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
183 | { | |
b5ed54e9 | 184 | struct net_bridge_port *port; |
5dce971a | 185 | |
b5ed54e9 | 186 | port = br_port_get_rcu(dev); |
187 | return port ? port->br->dev : NULL; | |
5dce971a | 188 | } |
1da177e4 | 189 | |
fdeabdef SH |
190 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
191 | { | |
192 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
193 | if (likely(skb->nf_bridge)) | |
194 | atomic_set(&(skb->nf_bridge->use), 1); | |
195 | ||
196 | return skb->nf_bridge; | |
197 | } | |
198 | ||
2dc2f207 PM |
199 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
200 | { | |
201 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
202 | ||
203 | if (atomic_read(&nf_bridge->use) > 1) { | |
204 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
205 | ||
206 | if (tmp) { | |
207 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
208 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 209 | } |
4c3a76ab | 210 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
211 | nf_bridge = tmp; |
212 | } | |
213 | return nf_bridge; | |
214 | } | |
215 | ||
fc38582d PM |
216 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
217 | { | |
218 | unsigned int len = nf_bridge_encap_header_len(skb); | |
219 | ||
220 | skb_push(skb, len); | |
221 | skb->network_header -= len; | |
222 | } | |
223 | ||
224 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 225 | { |
fc38582d PM |
226 | unsigned int len = nf_bridge_encap_header_len(skb); |
227 | ||
228 | skb_pull(skb, len); | |
229 | skb->network_header += len; | |
230 | } | |
fdeabdef | 231 | |
fc38582d PM |
232 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
233 | { | |
234 | unsigned int len = nf_bridge_encap_header_len(skb); | |
235 | ||
236 | skb_pull_rcsum(skb, len); | |
237 | skb->network_header += len; | |
238 | } | |
239 | ||
240 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
241 | { | |
242 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 243 | |
d626f62b ACM |
244 | skb_copy_from_linear_data_offset(skb, -header_size, |
245 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
246 | } |
247 | ||
e179e632 BDS |
248 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
249 | { | |
250 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
251 | skb->protocol = htons(ETH_P_8021Q); | |
252 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
253 | skb->protocol = htons(ETH_P_PPP_SES); | |
254 | } | |
255 | ||
462fb2af BD |
256 | /* When handing a packet over to the IP layer |
257 | * check whether we have a skb that is in the | |
258 | * expected format | |
259 | */ | |
260 | ||
d0280232 | 261 | static int br_parse_ip_options(struct sk_buff *skb) |
462fb2af BD |
262 | { |
263 | struct ip_options *opt; | |
b71d1d42 | 264 | const struct iphdr *iph; |
462fb2af BD |
265 | struct net_device *dev = skb->dev; |
266 | u32 len; | |
267 | ||
268 | iph = ip_hdr(skb); | |
269 | opt = &(IPCB(skb)->opt); | |
270 | ||
271 | /* Basic sanity checks */ | |
272 | if (iph->ihl < 5 || iph->version != 4) | |
273 | goto inhdr_error; | |
274 | ||
275 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
276 | goto inhdr_error; | |
277 | ||
278 | iph = ip_hdr(skb); | |
279 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
280 | goto inhdr_error; | |
281 | ||
282 | len = ntohs(iph->tot_len); | |
283 | if (skb->len < len) { | |
284 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
285 | goto drop; | |
286 | } else if (len < (iph->ihl*4)) | |
287 | goto inhdr_error; | |
288 | ||
289 | if (pskb_trim_rcsum(skb, len)) { | |
290 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
291 | goto drop; | |
292 | } | |
293 | ||
f8e9881c ED |
294 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
295 | if (iph->ihl == 5) | |
462fb2af | 296 | return 0; |
462fb2af BD |
297 | |
298 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
299 | if (ip_options_compile(dev_net(dev), opt, skb)) | |
300 | goto inhdr_error; | |
301 | ||
302 | /* Check correct handling of SRR option */ | |
303 | if (unlikely(opt->srr)) { | |
304 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
305 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) | |
306 | goto drop; | |
307 | ||
308 | if (ip_options_rcv_srr(skb)) | |
309 | goto drop; | |
310 | } | |
311 | ||
312 | return 0; | |
313 | ||
314 | inhdr_error: | |
315 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
316 | drop: | |
317 | return -1; | |
318 | } | |
319 | ||
e179e632 BDS |
320 | /* Fill in the header for fragmented IP packets handled by |
321 | * the IPv4 connection tracking code. | |
07317621 SH |
322 | */ |
323 | int nf_bridge_copy_header(struct sk_buff *skb) | |
324 | { | |
325 | int err; | |
e179e632 | 326 | unsigned int header_size; |
07317621 | 327 | |
e179e632 BDS |
328 | nf_bridge_update_protocol(skb); |
329 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 330 | err = skb_cow_head(skb, header_size); |
07317621 SH |
331 | if (err) |
332 | return err; | |
333 | ||
27d7ff46 ACM |
334 | skb_copy_to_linear_data_offset(skb, -header_size, |
335 | skb->nf_bridge->data, header_size); | |
fc38582d | 336 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
337 | return 0; |
338 | } | |
339 | ||
1da177e4 LT |
340 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
341 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
342 | * bridge PRE_ROUTING hook. */ | |
343 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
344 | { | |
345 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 346 | struct rtable *rt; |
1da177e4 | 347 | |
1da177e4 LT |
348 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
349 | skb->pkt_type = PACKET_OTHERHOST; | |
350 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
351 | } | |
352 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
353 | ||
511c3f92 ED |
354 | rt = bridge_parent_rtable(nf_bridge->physindev); |
355 | if (!rt) { | |
4adf0af6 SW |
356 | kfree_skb(skb); |
357 | return 0; | |
358 | } | |
f9181f4f | 359 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
360 | |
361 | skb->dev = nf_bridge->physindev; | |
e179e632 | 362 | nf_bridge_update_protocol(skb); |
fc38582d | 363 | nf_bridge_push_encap_header(skb); |
713aefa3 | 364 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
365 | br_handle_frame_finish, 1); |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
e179e632 BDS |
370 | /* Obtain the correct destination MAC address, while preserving the original |
371 | * source MAC address. If we already know this address, we just copy it. If we | |
372 | * don't, we use the neighbour framework to find out. In both cases, we make | |
373 | * sure that br_handle_frame_finish() is called afterwards. | |
374 | */ | |
375 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
376 | { | |
377 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
f6b72b62 | 378 | struct neighbour *neigh; |
e179e632 BDS |
379 | struct dst_entry *dst; |
380 | ||
381 | skb->dev = bridge_parent(skb->dev); | |
382 | if (!skb->dev) | |
383 | goto free_skb; | |
384 | dst = skb_dst(skb); | |
f9d75166 DM |
385 | neigh = dst_neigh_lookup_skb(dst, skb); |
386 | if (neigh) { | |
387 | int ret; | |
388 | ||
389 | if (neigh->hh.hh_len) { | |
390 | neigh_hh_bridge(&neigh->hh, skb); | |
391 | skb->dev = nf_bridge->physindev; | |
392 | ret = br_handle_frame_finish(skb); | |
393 | } else { | |
394 | /* the neighbour function below overwrites the complete | |
395 | * MAC header, so we save the Ethernet source address and | |
396 | * protocol number. | |
397 | */ | |
398 | skb_copy_from_linear_data_offset(skb, | |
399 | -(ETH_HLEN-ETH_ALEN), | |
400 | skb->nf_bridge->data, | |
401 | ETH_HLEN-ETH_ALEN); | |
402 | /* tell br_dev_xmit to continue with forwarding */ | |
403 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
404 | ret = neigh->output(neigh, skb); | |
405 | } | |
406 | neigh_release(neigh); | |
407 | return ret; | |
e179e632 BDS |
408 | } |
409 | free_skb: | |
410 | kfree_skb(skb); | |
411 | return 0; | |
412 | } | |
413 | ||
1da177e4 | 414 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 415 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
416 | * |
417 | * There are two cases to consider: | |
418 | * 1. The packet was DNAT'ed to a device in the same bridge | |
419 | * port group as it was received on. We can still bridge | |
420 | * the packet. | |
421 | * 2. The packet was DNAT'ed to a different device, either | |
422 | * a non-bridged device or another bridge port group. | |
423 | * The packet will need to be routed. | |
424 | * | |
425 | * The correct way of distinguishing between these two cases is to | |
426 | * call ip_route_input() and to look at skb->dst->dev, which is | |
427 | * changed to the destination device if ip_route_input() succeeds. | |
428 | * | |
ea2d9b41 | 429 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 430 | * |
ea2d9b41 BDS |
431 | * If the output device equals the logical bridge device the packet |
432 | * came in on, we can consider this bridging. The corresponding MAC | |
433 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
434 | * Otherwise, the packet is considered to be routed and we just |
435 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
436 | * later be passed up to the IP stack to be routed. For a redirected |
437 | * packet, ip_route_input() will give back the localhost as output device, | |
438 | * which differs from the bridge device. | |
1da177e4 | 439 | * |
ea2d9b41 | 440 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 441 | * |
f216f082 BDS |
442 | * This can be because the destination address is martian, in which case |
443 | * the packet will be dropped. | |
ea2d9b41 BDS |
444 | * If IP forwarding is disabled, ip_route_input() will fail, while |
445 | * ip_route_output_key() can return success. The source | |
446 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 447 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
448 | * if IP forwarding is enabled. If the output device equals the logical bridge |
449 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
450 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
451 | */ | |
1da177e4 LT |
452 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
453 | { | |
454 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 455 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 456 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 457 | struct rtable *rt; |
f216f082 | 458 | int err; |
1da177e4 | 459 | |
1da177e4 LT |
460 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
461 | skb->pkt_type = PACKET_OTHERHOST; | |
462 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
463 | } | |
464 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 465 | if (dnat_took_place(skb)) { |
f216f082 | 466 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 467 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
468 | |
469 | /* If err equals -EHOSTUNREACH the error is due to a | |
470 | * martian destination or due to the fact that | |
471 | * forwarding is disabled. For most martian packets, | |
472 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
473 | * martian destinations: loopback destinations and destination | |
474 | * 0.0.0.0. In both cases the packet will be dropped because the | |
475 | * destination is the loopback device and not the bridge. */ | |
476 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
477 | goto free_skb; | |
1da177e4 | 478 | |
78fbfd8a DM |
479 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
480 | RT_TOS(iph->tos), 0); | |
b23dd4fe | 481 | if (!IS_ERR(rt)) { |
1c011bed | 482 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 483 | * require ip_forwarding. */ |
b23dd4fe DM |
484 | if (rt->dst.dev == dev) { |
485 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
486 | goto bridged_dnat; |
487 | } | |
b23dd4fe | 488 | ip_rt_put(rt); |
1da177e4 | 489 | } |
f216f082 | 490 | free_skb: |
1da177e4 LT |
491 | kfree_skb(skb); |
492 | return 0; | |
493 | } else { | |
adf30907 | 494 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 495 | bridged_dnat: |
1da177e4 | 496 | skb->dev = nf_bridge->physindev; |
e179e632 | 497 | nf_bridge_update_protocol(skb); |
fc38582d | 498 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
499 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
500 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
501 | skb, skb->dev, NULL, |
502 | br_nf_pre_routing_finish_bridge, | |
503 | 1); | |
504 | return 0; | |
505 | } | |
789bc3e5 | 506 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
507 | skb->pkt_type = PACKET_HOST; |
508 | } | |
509 | } else { | |
511c3f92 ED |
510 | rt = bridge_parent_rtable(nf_bridge->physindev); |
511 | if (!rt) { | |
4adf0af6 SW |
512 | kfree_skb(skb); |
513 | return 0; | |
514 | } | |
f9181f4f | 515 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
516 | } |
517 | ||
518 | skb->dev = nf_bridge->physindev; | |
e179e632 | 519 | nf_bridge_update_protocol(skb); |
fc38582d | 520 | nf_bridge_push_encap_header(skb); |
713aefa3 | 521 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
522 | br_handle_frame_finish, 1); |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
4981682c PNA |
527 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) |
528 | { | |
529 | struct net_device *vlan, *br; | |
530 | ||
531 | br = bridge_parent(dev); | |
532 | if (brnf_pass_vlan_indev == 0 || !vlan_tx_tag_present(skb)) | |
533 | return br; | |
534 | ||
535 | vlan = __vlan_find_dev_deep(br, vlan_tx_tag_get(skb) & VLAN_VID_MASK); | |
536 | ||
537 | return vlan ? vlan : br; | |
538 | } | |
539 | ||
1da177e4 | 540 | /* Some common code for IPv4/IPv6 */ |
5dce971a | 541 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
542 | { |
543 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
544 | ||
545 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
546 | skb->pkt_type = PACKET_HOST; | |
547 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
548 | } | |
549 | ||
550 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
551 | nf_bridge->physindev = skb->dev; | |
4981682c | 552 | skb->dev = brnf_get_logical_dev(skb, skb->dev); |
e179e632 BDS |
553 | if (skb->protocol == htons(ETH_P_8021Q)) |
554 | nf_bridge->mask |= BRNF_8021Q; | |
555 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
556 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
557 | |
558 | return skb->dev; | |
1da177e4 LT |
559 | } |
560 | ||
561 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
562 | static int check_hbh_len(struct sk_buff *skb) | |
563 | { | |
0660e03f | 564 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 565 | u32 pkt_len; |
d56f90a7 ACM |
566 | const unsigned char *nh = skb_network_header(skb); |
567 | int off = raw - nh; | |
789bc3e5 | 568 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
569 | |
570 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
571 | goto bad; | |
572 | ||
573 | off += 2; | |
574 | len -= 2; | |
575 | ||
576 | while (len > 0) { | |
d56f90a7 | 577 | int optlen = nh[off + 1] + 2; |
1da177e4 | 578 | |
d56f90a7 | 579 | switch (nh[off]) { |
1de5a71c | 580 | case IPV6_TLV_PAD1: |
1da177e4 LT |
581 | optlen = 1; |
582 | break; | |
583 | ||
584 | case IPV6_TLV_PADN: | |
585 | break; | |
586 | ||
587 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 588 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 589 | goto bad; |
d56f90a7 | 590 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 591 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 592 | ipv6_hdr(skb)->payload_len) |
b0366486 | 593 | goto bad; |
1da177e4 LT |
594 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
595 | goto bad; | |
b0366486 | 596 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 597 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 598 | goto bad; |
d56f90a7 | 599 | nh = skb_network_header(skb); |
1da177e4 LT |
600 | break; |
601 | default: | |
602 | if (optlen > len) | |
603 | goto bad; | |
604 | break; | |
605 | } | |
606 | off += optlen; | |
607 | len -= optlen; | |
608 | } | |
609 | if (len == 0) | |
610 | return 0; | |
611 | bad: | |
612 | return -1; | |
613 | ||
614 | } | |
615 | ||
616 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
617 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
618 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
619 | struct sk_buff *skb, |
620 | const struct net_device *in, | |
621 | const struct net_device *out, | |
622 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 623 | { |
b71d1d42 | 624 | const struct ipv6hdr *hdr; |
1da177e4 | 625 | u32 pkt_len; |
1da177e4 LT |
626 | |
627 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 628 | return NF_DROP; |
1da177e4 LT |
629 | |
630 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 631 | return NF_DROP; |
1da177e4 | 632 | |
0660e03f | 633 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
634 | |
635 | if (hdr->version != 6) | |
deef4b52 | 636 | return NF_DROP; |
1da177e4 LT |
637 | |
638 | pkt_len = ntohs(hdr->payload_len); | |
639 | ||
640 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
641 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 642 | return NF_DROP; |
b38dfee3 | 643 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 644 | return NF_DROP; |
1da177e4 LT |
645 | } |
646 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 647 | return NF_DROP; |
1da177e4 | 648 | |
789bc3e5 | 649 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 650 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 651 | return NF_DROP; |
5dce971a SH |
652 | if (!setup_pre_routing(skb)) |
653 | return NF_DROP; | |
1da177e4 | 654 | |
e179e632 | 655 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 656 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
657 | br_nf_pre_routing_finish_ipv6); |
658 | ||
659 | return NF_STOLEN; | |
1da177e4 LT |
660 | } |
661 | ||
662 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
663 | * Replicate the checks that IPv4 does on packet reception. | |
664 | * Set skb->dev to the bridge device (i.e. parent of the | |
665 | * receiving device) to make netfilter happy, the REDIRECT | |
666 | * target in particular. Save the original destination IP | |
667 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 668 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
669 | const struct net_device *in, |
670 | const struct net_device *out, | |
671 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 672 | { |
4df53d8b PM |
673 | struct net_bridge_port *p; |
674 | struct net_bridge *br; | |
e7c243c9 EP |
675 | __u32 len = nf_bridge_encap_header_len(skb); |
676 | ||
e7c243c9 | 677 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 678 | return NF_DROP; |
1da177e4 | 679 | |
e490c1de | 680 | p = br_port_get_rcu(in); |
4df53d8b | 681 | if (p == NULL) |
deef4b52 | 682 | return NF_DROP; |
4df53d8b PM |
683 | br = p->br; |
684 | ||
739e4505 | 685 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
4df53d8b | 686 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 687 | return NF_ACCEPT; |
4df53d8b | 688 | |
fc38582d | 689 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
690 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
691 | } | |
4df53d8b PM |
692 | |
693 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 694 | return NF_ACCEPT; |
1da177e4 | 695 | |
739e4505 | 696 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
1da177e4 LT |
697 | return NF_ACCEPT; |
698 | ||
fc38582d | 699 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 700 | |
462fb2af | 701 | if (br_parse_ip_options(skb)) |
deef4b52 | 702 | return NF_DROP; |
17762060 | 703 | |
789bc3e5 | 704 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 705 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 706 | return NF_DROP; |
5dce971a SH |
707 | if (!setup_pre_routing(skb)) |
708 | return NF_DROP; | |
1da177e4 | 709 | store_orig_dstaddr(skb); |
e179e632 | 710 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 711 | |
713aefa3 | 712 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
713 | br_nf_pre_routing_finish); |
714 | ||
715 | return NF_STOLEN; | |
1da177e4 LT |
716 | } |
717 | ||
718 | ||
719 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
720 | /* The packet is locally destined, which requires a real | |
721 | * dst_entry, so detach the fake one. On the way up, the | |
722 | * packet would pass through PRE_ROUTING again (which already | |
723 | * took place when the packet entered the bridge), but we | |
724 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
725 | * prevent this from happening. */ | |
3db05fea | 726 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
727 | const struct net_device *in, |
728 | const struct net_device *out, | |
729 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 730 | { |
a881e963 | 731 | br_drop_fake_rtable(skb); |
1da177e4 LT |
732 | return NF_ACCEPT; |
733 | } | |
734 | ||
1da177e4 LT |
735 | /* PF_BRIDGE/FORWARD *************************************************/ |
736 | static int br_nf_forward_finish(struct sk_buff *skb) | |
737 | { | |
738 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
739 | struct net_device *in; | |
1da177e4 | 740 | |
739e4505 | 741 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
742 | in = nf_bridge->physindev; |
743 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
744 | skb->pkt_type = PACKET_OTHERHOST; | |
745 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
746 | } | |
e94c6743 | 747 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
748 | } else { |
749 | in = *((struct net_device **)(skb->cb)); | |
750 | } | |
fc38582d | 751 | nf_bridge_push_encap_header(skb); |
e179e632 | 752 | |
713aefa3 | 753 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 754 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
755 | return 0; |
756 | } | |
757 | ||
739e4505 | 758 | |
1da177e4 LT |
759 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
760 | * netfilter with indev and outdev set to the bridge device, | |
761 | * but we are still able to filter on the 'real' indev/outdev | |
762 | * because of the physdev module. For ARP, indev and outdev are the | |
763 | * bridge ports. */ | |
3db05fea | 764 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
765 | const struct net_device *in, |
766 | const struct net_device *out, | |
767 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 768 | { |
1da177e4 | 769 | struct nf_bridge_info *nf_bridge; |
5dce971a | 770 | struct net_device *parent; |
76108cea | 771 | u_int8_t pf; |
1da177e4 LT |
772 | |
773 | if (!skb->nf_bridge) | |
774 | return NF_ACCEPT; | |
775 | ||
2dc2f207 PM |
776 | /* Need exclusive nf_bridge_info since we might have multiple |
777 | * different physoutdevs. */ | |
778 | if (!nf_bridge_unshare(skb)) | |
779 | return NF_DROP; | |
780 | ||
5dce971a SH |
781 | parent = bridge_parent(out); |
782 | if (!parent) | |
783 | return NF_DROP; | |
784 | ||
739e4505 | 785 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 786 | pf = NFPROTO_IPV4; |
739e4505 | 787 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 788 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
789 | else |
790 | return NF_ACCEPT; | |
1da177e4 | 791 | |
3db05fea | 792 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 793 | |
1da177e4 LT |
794 | nf_bridge = skb->nf_bridge; |
795 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
796 | skb->pkt_type = PACKET_HOST; | |
797 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
798 | } | |
799 | ||
aa740f46 | 800 | if (pf == NFPROTO_IPV4 && br_parse_ip_options(skb)) |
6b1e960f HX |
801 | return NF_DROP; |
802 | ||
1da177e4 LT |
803 | /* The physdev module checks on this */ |
804 | nf_bridge->mask |= BRNF_BRIDGED; | |
805 | nf_bridge->physoutdev = skb->dev; | |
aa740f46 | 806 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
807 | skb->protocol = htons(ETH_P_IP); |
808 | else | |
809 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 810 | |
4981682c | 811 | NF_HOOK(pf, NF_INET_FORWARD, skb, brnf_get_logical_dev(skb, in), parent, |
5dce971a | 812 | br_nf_forward_finish); |
1da177e4 LT |
813 | |
814 | return NF_STOLEN; | |
815 | } | |
816 | ||
3db05fea | 817 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
818 | const struct net_device *in, |
819 | const struct net_device *out, | |
820 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 821 | { |
4df53d8b PM |
822 | struct net_bridge_port *p; |
823 | struct net_bridge *br; | |
1da177e4 LT |
824 | struct net_device **d = (struct net_device **)(skb->cb); |
825 | ||
e490c1de | 826 | p = br_port_get_rcu(out); |
4df53d8b PM |
827 | if (p == NULL) |
828 | return NF_ACCEPT; | |
829 | br = p->br; | |
830 | ||
831 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 832 | return NF_ACCEPT; |
1da177e4 | 833 | |
739e4505 | 834 | if (!IS_ARP(skb)) { |
8b42ec39 | 835 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 836 | return NF_ACCEPT; |
3db05fea | 837 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
838 | } |
839 | ||
d0a92be0 | 840 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 841 | if (IS_VLAN_ARP(skb)) |
3db05fea | 842 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
843 | return NF_ACCEPT; |
844 | } | |
845 | *d = (struct net_device *)in; | |
fdc9314c | 846 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
847 | (struct net_device *)out, br_nf_forward_finish); |
848 | ||
849 | return NF_STOLEN; | |
850 | } | |
851 | ||
e6373c4c | 852 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV4) |
2e2f7aef PM |
853 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
854 | { | |
462fb2af BD |
855 | int ret; |
856 | ||
e179e632 | 857 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 858 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 859 | !skb_is_gso(skb)) { |
462fb2af BD |
860 | if (br_parse_ip_options(skb)) |
861 | /* Drop invalid packet */ | |
862 | return NF_DROP; | |
863 | ret = ip_fragment(skb, br_dev_queue_push_xmit); | |
87f94b4e | 864 | } else |
462fb2af BD |
865 | ret = br_dev_queue_push_xmit(skb); |
866 | ||
867 | return ret; | |
2e2f7aef | 868 | } |
c197facc | 869 | #else |
870 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
871 | { | |
872 | return br_dev_queue_push_xmit(skb); | |
873 | } | |
874 | #endif | |
1da177e4 LT |
875 | |
876 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 877 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
878 | const struct net_device *in, |
879 | const struct net_device *out, | |
880 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 881 | { |
3db05fea | 882 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 883 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 884 | u_int8_t pf; |
1da177e4 | 885 | |
ea2d9b41 | 886 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
887 | return NF_ACCEPT; |
888 | ||
5dce971a SH |
889 | if (!realoutdev) |
890 | return NF_DROP; | |
891 | ||
739e4505 | 892 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
aa740f46 | 893 | pf = NFPROTO_IPV4; |
739e4505 | 894 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
aa740f46 | 895 | pf = NFPROTO_IPV6; |
a2bd40ad HX |
896 | else |
897 | return NF_ACCEPT; | |
1da177e4 | 898 | |
1da177e4 LT |
899 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
900 | * about the value of skb->pkt_type. */ | |
901 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
902 | skb->pkt_type = PACKET_HOST; | |
903 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
904 | } | |
905 | ||
fc38582d | 906 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 907 | nf_bridge_save_header(skb); |
aa740f46 | 908 | if (pf == NFPROTO_IPV4) |
e179e632 BDS |
909 | skb->protocol = htons(ETH_P_IP); |
910 | else | |
911 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 912 | |
6e23ae2a | 913 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 914 | br_nf_dev_queue_xmit); |
1da177e4 LT |
915 | |
916 | return NF_STOLEN; | |
1da177e4 LT |
917 | } |
918 | ||
1da177e4 LT |
919 | /* IP/SABOTAGE *****************************************************/ |
920 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
921 | * for the second time. */ | |
3db05fea | 922 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
923 | const struct net_device *in, |
924 | const struct net_device *out, | |
925 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 926 | { |
3db05fea HX |
927 | if (skb->nf_bridge && |
928 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
929 | return NF_STOP; |
930 | } | |
931 | ||
932 | return NF_ACCEPT; | |
933 | } | |
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 | |
8d65af78 | 991 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 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 | ||
1003 | static ctl_table brnf_table[] = { | |
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 | ||
5eb87f45 | 1050 | int __init br_netfilter_init(void) |
1da177e4 | 1051 | { |
5eb87f45 | 1052 | int ret; |
1da177e4 | 1053 | |
fc66f95c | 1054 | ret = dst_entries_init(&fake_dst_ops); |
5eb87f45 | 1055 | if (ret < 0) |
1da177e4 | 1056 | return ret; |
fc66f95c ED |
1057 | |
1058 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
1059 | if (ret < 0) { | |
1060 | dst_entries_destroy(&fake_dst_ops); | |
1061 | return ret; | |
1062 | } | |
1da177e4 | 1063 | #ifdef CONFIG_SYSCTL |
ec8f23ce | 1064 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); |
1da177e4 | 1065 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1066 | printk(KERN_WARNING |
1067 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 | 1068 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
fc66f95c | 1069 | dst_entries_destroy(&fake_dst_ops); |
5eb87f45 | 1070 | return -ENOMEM; |
1da177e4 LT |
1071 | } |
1072 | #endif | |
1da177e4 | 1073 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1074 | return 0; |
1075 | } | |
1076 | ||
1077 | void br_netfilter_fini(void) | |
1078 | { | |
5eb87f45 | 1079 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 | 1080 | #ifdef CONFIG_SYSCTL |
5dd3df10 | 1081 | unregister_net_sysctl_table(brnf_sysctl_header); |
1da177e4 | 1082 | #endif |
fc66f95c | 1083 | dst_entries_destroy(&fake_dst_ops); |
1da177e4 | 1084 | } |