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; | |
1da177e4 | 57 | #else |
4df53d8b PM |
58 | #define brnf_call_iptables 1 |
59 | #define brnf_call_ip6tables 1 | |
60 | #define brnf_call_arptables 1 | |
47e0e1ca HX |
61 | #define brnf_filter_vlan_tagged 0 |
62 | #define brnf_filter_pppoe_tagged 0 | |
1da177e4 LT |
63 | #endif |
64 | ||
739e4505 FW |
65 | #define IS_IP(skb) \ |
66 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) | |
67 | ||
68 | #define IS_IPV6(skb) \ | |
69 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) | |
70 | ||
71 | #define IS_ARP(skb) \ | |
72 | (!vlan_tx_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) | |
73 | ||
b6f99a21 | 74 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 | 75 | { |
13937911 JG |
76 | if (vlan_tx_tag_present(skb)) |
77 | return skb->protocol; | |
78 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
79 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
80 | else | |
81 | return 0; | |
8b42ec39 SH |
82 | } |
83 | ||
84 | #define IS_VLAN_IP(skb) \ | |
13937911 | 85 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
86 | brnf_filter_vlan_tagged) |
87 | ||
88 | #define IS_VLAN_IPV6(skb) \ | |
13937911 | 89 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
8b42ec39 SH |
90 | brnf_filter_vlan_tagged) |
91 | ||
92 | #define IS_VLAN_ARP(skb) \ | |
13937911 | 93 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
8b42ec39 | 94 | brnf_filter_vlan_tagged) |
1da177e4 | 95 | |
516299d2 MM |
96 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
97 | { | |
98 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
99 | sizeof(struct pppoe_hdr))); | |
100 | } | |
101 | ||
102 | #define IS_PPPOE_IP(skb) \ | |
103 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
104 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
105 | brnf_filter_pppoe_tagged) | |
106 | ||
107 | #define IS_PPPOE_IPV6(skb) \ | |
108 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
109 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
110 | brnf_filter_pppoe_tagged) | |
111 | ||
631339f1 HX |
112 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
113 | { | |
114 | } | |
115 | ||
6407d74c AH |
116 | static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old) |
117 | { | |
118 | return NULL; | |
119 | } | |
120 | ||
d3aaeb38 DM |
121 | static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
122 | { | |
123 | return NULL; | |
124 | } | |
125 | ||
a13861a2 ED |
126 | static unsigned int fake_mtu(const struct dst_entry *dst) |
127 | { | |
128 | return dst->dev->mtu; | |
129 | } | |
130 | ||
631339f1 HX |
131 | static struct dst_ops fake_dst_ops = { |
132 | .family = AF_INET, | |
09640e63 | 133 | .protocol = cpu_to_be16(ETH_P_IP), |
631339f1 | 134 | .update_pmtu = fake_update_pmtu, |
6407d74c | 135 | .cow_metrics = fake_cow_metrics, |
d3aaeb38 | 136 | .neigh_lookup = fake_neigh_lookup, |
a13861a2 | 137 | .mtu = fake_mtu, |
631339f1 HX |
138 | }; |
139 | ||
4adf0af6 SW |
140 | /* |
141 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
142 | * Currently, we fill in the PMTU entry because netfilter |
143 | * refragmentation needs it, and the rt_flags entry because | |
144 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
145 | * require us to fill additional fields. |
146 | */ | |
33eb9873 ED |
147 | static const u32 br_dst_default_metrics[RTAX_MAX] = { |
148 | [RTAX_MTU - 1] = 1500, | |
149 | }; | |
150 | ||
4adf0af6 SW |
151 | void br_netfilter_rtable_init(struct net_bridge *br) |
152 | { | |
153 | struct rtable *rt = &br->fake_rtable; | |
154 | ||
d8d1f30b CG |
155 | atomic_set(&rt->dst.__refcnt, 1); |
156 | rt->dst.dev = br->dev; | |
157 | rt->dst.path = &rt->dst; | |
33eb9873 | 158 | dst_init_metrics(&rt->dst, br_dst_default_metrics, true); |
e688a604 | 159 | rt->dst.flags = DST_NOXFRM | DST_NOPEER; |
d8d1f30b | 160 | rt->dst.ops = &fake_dst_ops; |
4adf0af6 SW |
161 | } |
162 | ||
163 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
164 | { | |
b5ed54e9 | 165 | struct net_bridge_port *port; |
166 | ||
167 | port = br_port_get_rcu(dev); | |
168 | return port ? &port->br->fake_rtable : NULL; | |
4adf0af6 | 169 | } |
1da177e4 | 170 | |
5dce971a SH |
171 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
172 | { | |
b5ed54e9 | 173 | struct net_bridge_port *port; |
5dce971a | 174 | |
b5ed54e9 | 175 | port = br_port_get_rcu(dev); |
176 | return port ? port->br->dev : NULL; | |
5dce971a | 177 | } |
1da177e4 | 178 | |
fdeabdef SH |
179 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
180 | { | |
181 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
182 | if (likely(skb->nf_bridge)) | |
183 | atomic_set(&(skb->nf_bridge->use), 1); | |
184 | ||
185 | return skb->nf_bridge; | |
186 | } | |
187 | ||
2dc2f207 PM |
188 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
189 | { | |
190 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
191 | ||
192 | if (atomic_read(&nf_bridge->use) > 1) { | |
193 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
194 | ||
195 | if (tmp) { | |
196 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
197 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 198 | } |
4c3a76ab | 199 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
200 | nf_bridge = tmp; |
201 | } | |
202 | return nf_bridge; | |
203 | } | |
204 | ||
fc38582d PM |
205 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
206 | { | |
207 | unsigned int len = nf_bridge_encap_header_len(skb); | |
208 | ||
209 | skb_push(skb, len); | |
210 | skb->network_header -= len; | |
211 | } | |
212 | ||
213 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 214 | { |
fc38582d PM |
215 | unsigned int len = nf_bridge_encap_header_len(skb); |
216 | ||
217 | skb_pull(skb, len); | |
218 | skb->network_header += len; | |
219 | } | |
fdeabdef | 220 | |
fc38582d PM |
221 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
222 | { | |
223 | unsigned int len = nf_bridge_encap_header_len(skb); | |
224 | ||
225 | skb_pull_rcsum(skb, len); | |
226 | skb->network_header += len; | |
227 | } | |
228 | ||
229 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
230 | { | |
231 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 232 | |
d626f62b ACM |
233 | skb_copy_from_linear_data_offset(skb, -header_size, |
234 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
235 | } |
236 | ||
e179e632 BDS |
237 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
238 | { | |
239 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
240 | skb->protocol = htons(ETH_P_8021Q); | |
241 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
242 | skb->protocol = htons(ETH_P_PPP_SES); | |
243 | } | |
244 | ||
462fb2af BD |
245 | /* When handing a packet over to the IP layer |
246 | * check whether we have a skb that is in the | |
247 | * expected format | |
248 | */ | |
249 | ||
d0280232 | 250 | static int br_parse_ip_options(struct sk_buff *skb) |
462fb2af BD |
251 | { |
252 | struct ip_options *opt; | |
b71d1d42 | 253 | const struct iphdr *iph; |
462fb2af BD |
254 | struct net_device *dev = skb->dev; |
255 | u32 len; | |
256 | ||
257 | iph = ip_hdr(skb); | |
258 | opt = &(IPCB(skb)->opt); | |
259 | ||
260 | /* Basic sanity checks */ | |
261 | if (iph->ihl < 5 || iph->version != 4) | |
262 | goto inhdr_error; | |
263 | ||
264 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
265 | goto inhdr_error; | |
266 | ||
267 | iph = ip_hdr(skb); | |
268 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
269 | goto inhdr_error; | |
270 | ||
271 | len = ntohs(iph->tot_len); | |
272 | if (skb->len < len) { | |
273 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
274 | goto drop; | |
275 | } else if (len < (iph->ihl*4)) | |
276 | goto inhdr_error; | |
277 | ||
278 | if (pskb_trim_rcsum(skb, len)) { | |
279 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
280 | goto drop; | |
281 | } | |
282 | ||
f8e9881c ED |
283 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
284 | if (iph->ihl == 5) | |
462fb2af | 285 | return 0; |
462fb2af BD |
286 | |
287 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
288 | if (ip_options_compile(dev_net(dev), opt, skb)) | |
289 | goto inhdr_error; | |
290 | ||
291 | /* Check correct handling of SRR option */ | |
292 | if (unlikely(opt->srr)) { | |
293 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
294 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) | |
295 | goto drop; | |
296 | ||
297 | if (ip_options_rcv_srr(skb)) | |
298 | goto drop; | |
299 | } | |
300 | ||
301 | return 0; | |
302 | ||
303 | inhdr_error: | |
304 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
305 | drop: | |
306 | return -1; | |
307 | } | |
308 | ||
e179e632 BDS |
309 | /* Fill in the header for fragmented IP packets handled by |
310 | * the IPv4 connection tracking code. | |
07317621 SH |
311 | */ |
312 | int nf_bridge_copy_header(struct sk_buff *skb) | |
313 | { | |
314 | int err; | |
e179e632 | 315 | unsigned int header_size; |
07317621 | 316 | |
e179e632 BDS |
317 | nf_bridge_update_protocol(skb); |
318 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 319 | err = skb_cow_head(skb, header_size); |
07317621 SH |
320 | if (err) |
321 | return err; | |
322 | ||
27d7ff46 ACM |
323 | skb_copy_to_linear_data_offset(skb, -header_size, |
324 | skb->nf_bridge->data, header_size); | |
fc38582d | 325 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
326 | return 0; |
327 | } | |
328 | ||
1da177e4 LT |
329 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
330 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
331 | * bridge PRE_ROUTING hook. */ | |
332 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
333 | { | |
334 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 335 | struct rtable *rt; |
1da177e4 | 336 | |
1da177e4 LT |
337 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
338 | skb->pkt_type = PACKET_OTHERHOST; | |
339 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
340 | } | |
341 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
342 | ||
511c3f92 ED |
343 | rt = bridge_parent_rtable(nf_bridge->physindev); |
344 | if (!rt) { | |
4adf0af6 SW |
345 | kfree_skb(skb); |
346 | return 0; | |
347 | } | |
f9181f4f | 348 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
349 | |
350 | skb->dev = nf_bridge->physindev; | |
e179e632 | 351 | nf_bridge_update_protocol(skb); |
fc38582d | 352 | nf_bridge_push_encap_header(skb); |
713aefa3 | 353 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
354 | br_handle_frame_finish, 1); |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
e179e632 BDS |
359 | /* Obtain the correct destination MAC address, while preserving the original |
360 | * source MAC address. If we already know this address, we just copy it. If we | |
361 | * don't, we use the neighbour framework to find out. In both cases, we make | |
362 | * sure that br_handle_frame_finish() is called afterwards. | |
363 | */ | |
364 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
365 | { | |
366 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
f6b72b62 | 367 | struct neighbour *neigh; |
e179e632 BDS |
368 | struct dst_entry *dst; |
369 | ||
370 | skb->dev = bridge_parent(skb->dev); | |
371 | if (!skb->dev) | |
372 | goto free_skb; | |
373 | dst = skb_dst(skb); | |
27217455 | 374 | neigh = dst_get_neighbour_noref(dst); |
f6b72b62 DM |
375 | if (neigh->hh.hh_len) { |
376 | neigh_hh_bridge(&neigh->hh, skb); | |
e179e632 BDS |
377 | skb->dev = nf_bridge->physindev; |
378 | return br_handle_frame_finish(skb); | |
8f40b161 | 379 | } else { |
e179e632 BDS |
380 | /* the neighbour function below overwrites the complete |
381 | * MAC header, so we save the Ethernet source address and | |
382 | * protocol number. */ | |
383 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
384 | /* tell br_dev_xmit to continue with forwarding */ | |
385 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
8f40b161 | 386 | return neigh->output(neigh, skb); |
e179e632 BDS |
387 | } |
388 | free_skb: | |
389 | kfree_skb(skb); | |
390 | return 0; | |
391 | } | |
392 | ||
1da177e4 | 393 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 394 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
395 | * |
396 | * There are two cases to consider: | |
397 | * 1. The packet was DNAT'ed to a device in the same bridge | |
398 | * port group as it was received on. We can still bridge | |
399 | * the packet. | |
400 | * 2. The packet was DNAT'ed to a different device, either | |
401 | * a non-bridged device or another bridge port group. | |
402 | * The packet will need to be routed. | |
403 | * | |
404 | * The correct way of distinguishing between these two cases is to | |
405 | * call ip_route_input() and to look at skb->dst->dev, which is | |
406 | * changed to the destination device if ip_route_input() succeeds. | |
407 | * | |
ea2d9b41 | 408 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 409 | * |
ea2d9b41 BDS |
410 | * If the output device equals the logical bridge device the packet |
411 | * came in on, we can consider this bridging. The corresponding MAC | |
412 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
413 | * Otherwise, the packet is considered to be routed and we just |
414 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
415 | * later be passed up to the IP stack to be routed. For a redirected |
416 | * packet, ip_route_input() will give back the localhost as output device, | |
417 | * which differs from the bridge device. | |
1da177e4 | 418 | * |
ea2d9b41 | 419 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 420 | * |
f216f082 BDS |
421 | * This can be because the destination address is martian, in which case |
422 | * the packet will be dropped. | |
ea2d9b41 BDS |
423 | * If IP forwarding is disabled, ip_route_input() will fail, while |
424 | * ip_route_output_key() can return success. The source | |
425 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 426 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
427 | * if IP forwarding is enabled. If the output device equals the logical bridge |
428 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
429 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
430 | */ | |
1da177e4 LT |
431 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
432 | { | |
433 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 434 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 435 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 436 | struct rtable *rt; |
f216f082 | 437 | int err; |
1da177e4 | 438 | |
1da177e4 LT |
439 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
440 | skb->pkt_type = PACKET_OTHERHOST; | |
441 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
442 | } | |
443 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 444 | if (dnat_took_place(skb)) { |
f216f082 | 445 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 446 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
447 | |
448 | /* If err equals -EHOSTUNREACH the error is due to a | |
449 | * martian destination or due to the fact that | |
450 | * forwarding is disabled. For most martian packets, | |
451 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
452 | * martian destinations: loopback destinations and destination | |
453 | * 0.0.0.0. In both cases the packet will be dropped because the | |
454 | * destination is the loopback device and not the bridge. */ | |
455 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
456 | goto free_skb; | |
1da177e4 | 457 | |
78fbfd8a DM |
458 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
459 | RT_TOS(iph->tos), 0); | |
b23dd4fe | 460 | if (!IS_ERR(rt)) { |
1c011bed | 461 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 462 | * require ip_forwarding. */ |
b23dd4fe DM |
463 | if (rt->dst.dev == dev) { |
464 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
465 | goto bridged_dnat; |
466 | } | |
b23dd4fe | 467 | ip_rt_put(rt); |
1da177e4 | 468 | } |
f216f082 | 469 | free_skb: |
1da177e4 LT |
470 | kfree_skb(skb); |
471 | return 0; | |
472 | } else { | |
adf30907 | 473 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 474 | bridged_dnat: |
1da177e4 | 475 | skb->dev = nf_bridge->physindev; |
e179e632 | 476 | nf_bridge_update_protocol(skb); |
fc38582d | 477 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
478 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
479 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
480 | skb, skb->dev, NULL, |
481 | br_nf_pre_routing_finish_bridge, | |
482 | 1); | |
483 | return 0; | |
484 | } | |
789bc3e5 | 485 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
486 | skb->pkt_type = PACKET_HOST; |
487 | } | |
488 | } else { | |
511c3f92 ED |
489 | rt = bridge_parent_rtable(nf_bridge->physindev); |
490 | if (!rt) { | |
4adf0af6 SW |
491 | kfree_skb(skb); |
492 | return 0; | |
493 | } | |
f9181f4f | 494 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
495 | } |
496 | ||
497 | skb->dev = nf_bridge->physindev; | |
e179e632 | 498 | nf_bridge_update_protocol(skb); |
fc38582d | 499 | nf_bridge_push_encap_header(skb); |
713aefa3 | 500 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
501 | br_handle_frame_finish, 1); |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 507 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
508 | { |
509 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
510 | ||
511 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
512 | skb->pkt_type = PACKET_HOST; | |
513 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
514 | } | |
515 | ||
516 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
517 | nf_bridge->physindev = skb->dev; | |
518 | skb->dev = bridge_parent(skb->dev); | |
e179e632 BDS |
519 | if (skb->protocol == htons(ETH_P_8021Q)) |
520 | nf_bridge->mask |= BRNF_8021Q; | |
521 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
522 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
523 | |
524 | return skb->dev; | |
1da177e4 LT |
525 | } |
526 | ||
527 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
528 | static int check_hbh_len(struct sk_buff *skb) | |
529 | { | |
0660e03f | 530 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 531 | u32 pkt_len; |
d56f90a7 ACM |
532 | const unsigned char *nh = skb_network_header(skb); |
533 | int off = raw - nh; | |
789bc3e5 | 534 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
535 | |
536 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
537 | goto bad; | |
538 | ||
539 | off += 2; | |
540 | len -= 2; | |
541 | ||
542 | while (len > 0) { | |
d56f90a7 | 543 | int optlen = nh[off + 1] + 2; |
1da177e4 | 544 | |
d56f90a7 | 545 | switch (nh[off]) { |
1da177e4 LT |
546 | case IPV6_TLV_PAD0: |
547 | optlen = 1; | |
548 | break; | |
549 | ||
550 | case IPV6_TLV_PADN: | |
551 | break; | |
552 | ||
553 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 554 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 555 | goto bad; |
d56f90a7 | 556 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 557 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 558 | ipv6_hdr(skb)->payload_len) |
b0366486 | 559 | goto bad; |
1da177e4 LT |
560 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
561 | goto bad; | |
b0366486 | 562 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 563 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 564 | goto bad; |
d56f90a7 | 565 | nh = skb_network_header(skb); |
1da177e4 LT |
566 | break; |
567 | default: | |
568 | if (optlen > len) | |
569 | goto bad; | |
570 | break; | |
571 | } | |
572 | off += optlen; | |
573 | len -= optlen; | |
574 | } | |
575 | if (len == 0) | |
576 | return 0; | |
577 | bad: | |
578 | return -1; | |
579 | ||
580 | } | |
581 | ||
582 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
583 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
584 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
585 | struct sk_buff *skb, |
586 | const struct net_device *in, | |
587 | const struct net_device *out, | |
588 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 589 | { |
b71d1d42 | 590 | const struct ipv6hdr *hdr; |
1da177e4 | 591 | u32 pkt_len; |
1da177e4 LT |
592 | |
593 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 594 | return NF_DROP; |
1da177e4 LT |
595 | |
596 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 597 | return NF_DROP; |
1da177e4 | 598 | |
0660e03f | 599 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
600 | |
601 | if (hdr->version != 6) | |
deef4b52 | 602 | return NF_DROP; |
1da177e4 LT |
603 | |
604 | pkt_len = ntohs(hdr->payload_len); | |
605 | ||
606 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
607 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 608 | return NF_DROP; |
b38dfee3 | 609 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 610 | return NF_DROP; |
1da177e4 LT |
611 | } |
612 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 613 | return NF_DROP; |
1da177e4 | 614 | |
789bc3e5 | 615 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 616 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 617 | return NF_DROP; |
5dce971a SH |
618 | if (!setup_pre_routing(skb)) |
619 | return NF_DROP; | |
1da177e4 | 620 | |
e179e632 | 621 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 622 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
623 | br_nf_pre_routing_finish_ipv6); |
624 | ||
625 | return NF_STOLEN; | |
1da177e4 LT |
626 | } |
627 | ||
628 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
629 | * Replicate the checks that IPv4 does on packet reception. | |
630 | * Set skb->dev to the bridge device (i.e. parent of the | |
631 | * receiving device) to make netfilter happy, the REDIRECT | |
632 | * target in particular. Save the original destination IP | |
633 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 634 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
635 | const struct net_device *in, |
636 | const struct net_device *out, | |
637 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 638 | { |
4df53d8b PM |
639 | struct net_bridge_port *p; |
640 | struct net_bridge *br; | |
e7c243c9 EP |
641 | __u32 len = nf_bridge_encap_header_len(skb); |
642 | ||
e7c243c9 | 643 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 644 | return NF_DROP; |
1da177e4 | 645 | |
e490c1de | 646 | p = br_port_get_rcu(in); |
4df53d8b | 647 | if (p == NULL) |
deef4b52 | 648 | return NF_DROP; |
4df53d8b PM |
649 | br = p->br; |
650 | ||
739e4505 | 651 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { |
4df53d8b | 652 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 653 | return NF_ACCEPT; |
4df53d8b | 654 | |
fc38582d | 655 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
656 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
657 | } | |
4df53d8b PM |
658 | |
659 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 660 | return NF_ACCEPT; |
1da177e4 | 661 | |
739e4505 | 662 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) |
1da177e4 LT |
663 | return NF_ACCEPT; |
664 | ||
fc38582d | 665 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 666 | |
462fb2af | 667 | if (br_parse_ip_options(skb)) |
deef4b52 | 668 | return NF_DROP; |
17762060 | 669 | |
789bc3e5 | 670 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 671 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 672 | return NF_DROP; |
5dce971a SH |
673 | if (!setup_pre_routing(skb)) |
674 | return NF_DROP; | |
1da177e4 | 675 | store_orig_dstaddr(skb); |
e179e632 | 676 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 677 | |
713aefa3 | 678 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
679 | br_nf_pre_routing_finish); |
680 | ||
681 | return NF_STOLEN; | |
1da177e4 LT |
682 | } |
683 | ||
684 | ||
685 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
686 | /* The packet is locally destined, which requires a real | |
687 | * dst_entry, so detach the fake one. On the way up, the | |
688 | * packet would pass through PRE_ROUTING again (which already | |
689 | * took place when the packet entered the bridge), but we | |
690 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
691 | * prevent this from happening. */ | |
3db05fea | 692 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
693 | const struct net_device *in, |
694 | const struct net_device *out, | |
695 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 696 | { |
511c3f92 ED |
697 | struct rtable *rt = skb_rtable(skb); |
698 | ||
adf30907 ED |
699 | if (rt && rt == bridge_parent_rtable(in)) |
700 | skb_dst_drop(skb); | |
1da177e4 LT |
701 | |
702 | return NF_ACCEPT; | |
703 | } | |
704 | ||
1da177e4 LT |
705 | /* PF_BRIDGE/FORWARD *************************************************/ |
706 | static int br_nf_forward_finish(struct sk_buff *skb) | |
707 | { | |
708 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
709 | struct net_device *in; | |
1da177e4 | 710 | |
739e4505 | 711 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
712 | in = nf_bridge->physindev; |
713 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
714 | skb->pkt_type = PACKET_OTHERHOST; | |
715 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
716 | } | |
e94c6743 | 717 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
718 | } else { |
719 | in = *((struct net_device **)(skb->cb)); | |
720 | } | |
fc38582d | 721 | nf_bridge_push_encap_header(skb); |
e179e632 | 722 | |
713aefa3 | 723 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 724 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
725 | return 0; |
726 | } | |
727 | ||
739e4505 | 728 | |
1da177e4 LT |
729 | /* This is the 'purely bridged' case. For IP, we pass the packet to |
730 | * netfilter with indev and outdev set to the bridge device, | |
731 | * but we are still able to filter on the 'real' indev/outdev | |
732 | * because of the physdev module. For ARP, indev and outdev are the | |
733 | * bridge ports. */ | |
3db05fea | 734 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
735 | const struct net_device *in, |
736 | const struct net_device *out, | |
737 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 738 | { |
1da177e4 | 739 | struct nf_bridge_info *nf_bridge; |
5dce971a | 740 | struct net_device *parent; |
76108cea | 741 | u_int8_t pf; |
1da177e4 LT |
742 | |
743 | if (!skb->nf_bridge) | |
744 | return NF_ACCEPT; | |
745 | ||
2dc2f207 PM |
746 | /* Need exclusive nf_bridge_info since we might have multiple |
747 | * different physoutdevs. */ | |
748 | if (!nf_bridge_unshare(skb)) | |
749 | return NF_DROP; | |
750 | ||
5dce971a SH |
751 | parent = bridge_parent(out); |
752 | if (!parent) | |
753 | return NF_DROP; | |
754 | ||
739e4505 | 755 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
1da177e4 | 756 | pf = PF_INET; |
739e4505 | 757 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
1da177e4 | 758 | pf = PF_INET6; |
a2bd40ad HX |
759 | else |
760 | return NF_ACCEPT; | |
1da177e4 | 761 | |
3db05fea | 762 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 763 | |
1da177e4 LT |
764 | nf_bridge = skb->nf_bridge; |
765 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
766 | skb->pkt_type = PACKET_HOST; | |
767 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
768 | } | |
769 | ||
cb685528 | 770 | if (pf == PF_INET && br_parse_ip_options(skb)) |
6b1e960f HX |
771 | return NF_DROP; |
772 | ||
1da177e4 LT |
773 | /* The physdev module checks on this */ |
774 | nf_bridge->mask |= BRNF_BRIDGED; | |
775 | nf_bridge->physoutdev = skb->dev; | |
e179e632 BDS |
776 | if (pf == PF_INET) |
777 | skb->protocol = htons(ETH_P_IP); | |
778 | else | |
779 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 780 | |
6e23ae2a | 781 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 782 | br_nf_forward_finish); |
1da177e4 LT |
783 | |
784 | return NF_STOLEN; | |
785 | } | |
786 | ||
3db05fea | 787 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
788 | const struct net_device *in, |
789 | const struct net_device *out, | |
790 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 791 | { |
4df53d8b PM |
792 | struct net_bridge_port *p; |
793 | struct net_bridge *br; | |
1da177e4 LT |
794 | struct net_device **d = (struct net_device **)(skb->cb); |
795 | ||
e490c1de | 796 | p = br_port_get_rcu(out); |
4df53d8b PM |
797 | if (p == NULL) |
798 | return NF_ACCEPT; | |
799 | br = p->br; | |
800 | ||
801 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 802 | return NF_ACCEPT; |
1da177e4 | 803 | |
739e4505 | 804 | if (!IS_ARP(skb)) { |
8b42ec39 | 805 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 806 | return NF_ACCEPT; |
3db05fea | 807 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
808 | } |
809 | ||
d0a92be0 | 810 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 811 | if (IS_VLAN_ARP(skb)) |
3db05fea | 812 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
813 | return NF_ACCEPT; |
814 | } | |
815 | *d = (struct net_device *)in; | |
fdc9314c | 816 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
817 | (struct net_device *)out, br_nf_forward_finish); |
818 | ||
819 | return NF_STOLEN; | |
820 | } | |
821 | ||
e6373c4c | 822 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV4) |
2e2f7aef PM |
823 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
824 | { | |
462fb2af BD |
825 | int ret; |
826 | ||
e179e632 | 827 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 828 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 829 | !skb_is_gso(skb)) { |
462fb2af BD |
830 | if (br_parse_ip_options(skb)) |
831 | /* Drop invalid packet */ | |
832 | return NF_DROP; | |
833 | ret = ip_fragment(skb, br_dev_queue_push_xmit); | |
87f94b4e | 834 | } else |
462fb2af BD |
835 | ret = br_dev_queue_push_xmit(skb); |
836 | ||
837 | return ret; | |
2e2f7aef | 838 | } |
c197facc | 839 | #else |
840 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
841 | { | |
842 | return br_dev_queue_push_xmit(skb); | |
843 | } | |
844 | #endif | |
1da177e4 LT |
845 | |
846 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 847 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
848 | const struct net_device *in, |
849 | const struct net_device *out, | |
850 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 851 | { |
3db05fea | 852 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 853 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 854 | u_int8_t pf; |
1da177e4 | 855 | |
ea2d9b41 | 856 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
857 | return NF_ACCEPT; |
858 | ||
5dce971a SH |
859 | if (!realoutdev) |
860 | return NF_DROP; | |
861 | ||
739e4505 | 862 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) |
1da177e4 | 863 | pf = PF_INET; |
739e4505 | 864 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) |
1da177e4 | 865 | pf = PF_INET6; |
a2bd40ad HX |
866 | else |
867 | return NF_ACCEPT; | |
1da177e4 | 868 | |
1da177e4 LT |
869 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
870 | * about the value of skb->pkt_type. */ | |
871 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
872 | skb->pkt_type = PACKET_HOST; | |
873 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
874 | } | |
875 | ||
fc38582d | 876 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 877 | nf_bridge_save_header(skb); |
e179e632 BDS |
878 | if (pf == PF_INET) |
879 | skb->protocol = htons(ETH_P_IP); | |
880 | else | |
881 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 882 | |
6e23ae2a | 883 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 884 | br_nf_dev_queue_xmit); |
1da177e4 LT |
885 | |
886 | return NF_STOLEN; | |
1da177e4 LT |
887 | } |
888 | ||
1da177e4 LT |
889 | /* IP/SABOTAGE *****************************************************/ |
890 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
891 | * for the second time. */ | |
3db05fea | 892 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
893 | const struct net_device *in, |
894 | const struct net_device *out, | |
895 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 896 | { |
3db05fea HX |
897 | if (skb->nf_bridge && |
898 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
899 | return NF_STOP; |
900 | } | |
901 | ||
902 | return NF_ACCEPT; | |
903 | } | |
904 | ||
ea2d9b41 BDS |
905 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
906 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 907 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
908 | { |
909 | .hook = br_nf_pre_routing, | |
910 | .owner = THIS_MODULE, | |
911 | .pf = PF_BRIDGE, | |
912 | .hooknum = NF_BR_PRE_ROUTING, | |
913 | .priority = NF_BR_PRI_BRNF, | |
914 | }, | |
915 | { | |
916 | .hook = br_nf_local_in, | |
917 | .owner = THIS_MODULE, | |
918 | .pf = PF_BRIDGE, | |
919 | .hooknum = NF_BR_LOCAL_IN, | |
920 | .priority = NF_BR_PRI_BRNF, | |
921 | }, | |
922 | { | |
923 | .hook = br_nf_forward_ip, | |
924 | .owner = THIS_MODULE, | |
925 | .pf = PF_BRIDGE, | |
926 | .hooknum = NF_BR_FORWARD, | |
927 | .priority = NF_BR_PRI_BRNF - 1, | |
928 | }, | |
929 | { | |
930 | .hook = br_nf_forward_arp, | |
931 | .owner = THIS_MODULE, | |
932 | .pf = PF_BRIDGE, | |
933 | .hooknum = NF_BR_FORWARD, | |
934 | .priority = NF_BR_PRI_BRNF, | |
935 | }, | |
1490fd89 CG |
936 | { |
937 | .hook = br_nf_post_routing, | |
938 | .owner = THIS_MODULE, | |
939 | .pf = PF_BRIDGE, | |
940 | .hooknum = NF_BR_POST_ROUTING, | |
941 | .priority = NF_BR_PRI_LAST, | |
942 | }, | |
943 | { | |
944 | .hook = ip_sabotage_in, | |
945 | .owner = THIS_MODULE, | |
946 | .pf = PF_INET, | |
947 | .hooknum = NF_INET_PRE_ROUTING, | |
948 | .priority = NF_IP_PRI_FIRST, | |
949 | }, | |
950 | { | |
951 | .hook = ip_sabotage_in, | |
952 | .owner = THIS_MODULE, | |
953 | .pf = PF_INET6, | |
954 | .hooknum = NF_INET_PRE_ROUTING, | |
955 | .priority = NF_IP6_PRI_FIRST, | |
956 | }, | |
1da177e4 LT |
957 | }; |
958 | ||
959 | #ifdef CONFIG_SYSCTL | |
960 | static | |
8d65af78 | 961 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 962 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
963 | { |
964 | int ret; | |
965 | ||
8d65af78 | 966 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
967 | |
968 | if (write && *(int *)(ctl->data)) | |
969 | *(int *)(ctl->data) = 1; | |
970 | return ret; | |
971 | } | |
972 | ||
973 | static ctl_table brnf_table[] = { | |
974 | { | |
1da177e4 LT |
975 | .procname = "bridge-nf-call-arptables", |
976 | .data = &brnf_call_arptables, | |
977 | .maxlen = sizeof(int), | |
978 | .mode = 0644, | |
6d9f239a | 979 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
980 | }, |
981 | { | |
1da177e4 LT |
982 | .procname = "bridge-nf-call-iptables", |
983 | .data = &brnf_call_iptables, | |
984 | .maxlen = sizeof(int), | |
985 | .mode = 0644, | |
6d9f239a | 986 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
987 | }, |
988 | { | |
1da177e4 LT |
989 | .procname = "bridge-nf-call-ip6tables", |
990 | .data = &brnf_call_ip6tables, | |
991 | .maxlen = sizeof(int), | |
992 | .mode = 0644, | |
6d9f239a | 993 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
994 | }, |
995 | { | |
1da177e4 LT |
996 | .procname = "bridge-nf-filter-vlan-tagged", |
997 | .data = &brnf_filter_vlan_tagged, | |
998 | .maxlen = sizeof(int), | |
999 | .mode = 0644, | |
6d9f239a | 1000 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
1001 | }, |
1002 | { | |
516299d2 MM |
1003 | .procname = "bridge-nf-filter-pppoe-tagged", |
1004 | .data = &brnf_filter_pppoe_tagged, | |
1005 | .maxlen = sizeof(int), | |
1006 | .mode = 0644, | |
6d9f239a | 1007 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 1008 | }, |
f8572d8f | 1009 | { } |
1da177e4 LT |
1010 | }; |
1011 | ||
b5ccd792 | 1012 | static struct ctl_path brnf_path[] = { |
f8572d8f EB |
1013 | { .procname = "net", }, |
1014 | { .procname = "bridge", }, | |
b5ccd792 | 1015 | { } |
1da177e4 LT |
1016 | }; |
1017 | #endif | |
1018 | ||
5eb87f45 | 1019 | int __init br_netfilter_init(void) |
1da177e4 | 1020 | { |
5eb87f45 | 1021 | int ret; |
1da177e4 | 1022 | |
fc66f95c | 1023 | ret = dst_entries_init(&fake_dst_ops); |
5eb87f45 | 1024 | if (ret < 0) |
1da177e4 | 1025 | return ret; |
fc66f95c ED |
1026 | |
1027 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
1028 | if (ret < 0) { | |
1029 | dst_entries_destroy(&fake_dst_ops); | |
1030 | return ret; | |
1031 | } | |
1da177e4 | 1032 | #ifdef CONFIG_SYSCTL |
5dd3df10 | 1033 | brnf_sysctl_header = register_net_sysctl_table(&init_net, brnf_path, brnf_table); |
1da177e4 | 1034 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1035 | printk(KERN_WARNING |
1036 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 | 1037 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
fc66f95c | 1038 | dst_entries_destroy(&fake_dst_ops); |
5eb87f45 | 1039 | return -ENOMEM; |
1da177e4 LT |
1040 | } |
1041 | #endif | |
1da177e4 | 1042 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1043 | return 0; |
1044 | } | |
1045 | ||
1046 | void br_netfilter_fini(void) | |
1047 | { | |
5eb87f45 | 1048 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 | 1049 | #ifdef CONFIG_SYSCTL |
5dd3df10 | 1050 | unregister_net_sysctl_table(brnf_sysctl_header); |
1da177e4 | 1051 | #endif |
fc66f95c | 1052 | dst_entries_destroy(&fake_dst_ops); |
1da177e4 | 1053 | } |