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 | ||
b6f99a21 | 65 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 | 66 | { |
13937911 JG |
67 | if (vlan_tx_tag_present(skb)) |
68 | return skb->protocol; | |
69 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
70 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
71 | else | |
72 | return 0; | |
8b42ec39 SH |
73 | } |
74 | ||
75 | #define IS_VLAN_IP(skb) \ | |
13937911 | 76 | (vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
77 | brnf_filter_vlan_tagged) |
78 | ||
79 | #define IS_VLAN_IPV6(skb) \ | |
13937911 | 80 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ |
8b42ec39 SH |
81 | brnf_filter_vlan_tagged) |
82 | ||
83 | #define IS_VLAN_ARP(skb) \ | |
13937911 | 84 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ |
8b42ec39 | 85 | brnf_filter_vlan_tagged) |
1da177e4 | 86 | |
516299d2 MM |
87 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
88 | { | |
89 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
90 | sizeof(struct pppoe_hdr))); | |
91 | } | |
92 | ||
93 | #define IS_PPPOE_IP(skb) \ | |
94 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
95 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
96 | brnf_filter_pppoe_tagged) | |
97 | ||
98 | #define IS_PPPOE_IPV6(skb) \ | |
99 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
100 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
101 | brnf_filter_pppoe_tagged) | |
102 | ||
631339f1 HX |
103 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
104 | { | |
105 | } | |
106 | ||
6407d74c AH |
107 | static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old) |
108 | { | |
109 | return NULL; | |
110 | } | |
111 | ||
631339f1 HX |
112 | static struct dst_ops fake_dst_ops = { |
113 | .family = AF_INET, | |
09640e63 | 114 | .protocol = cpu_to_be16(ETH_P_IP), |
631339f1 | 115 | .update_pmtu = fake_update_pmtu, |
6407d74c | 116 | .cow_metrics = fake_cow_metrics, |
631339f1 HX |
117 | }; |
118 | ||
4adf0af6 SW |
119 | /* |
120 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
121 | * Currently, we fill in the PMTU entry because netfilter |
122 | * refragmentation needs it, and the rt_flags entry because | |
123 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
124 | * require us to fill additional fields. |
125 | */ | |
33eb9873 ED |
126 | static const u32 br_dst_default_metrics[RTAX_MAX] = { |
127 | [RTAX_MTU - 1] = 1500, | |
128 | }; | |
129 | ||
4adf0af6 SW |
130 | void br_netfilter_rtable_init(struct net_bridge *br) |
131 | { | |
132 | struct rtable *rt = &br->fake_rtable; | |
133 | ||
d8d1f30b CG |
134 | atomic_set(&rt->dst.__refcnt, 1); |
135 | rt->dst.dev = br->dev; | |
136 | rt->dst.path = &rt->dst; | |
33eb9873 | 137 | dst_init_metrics(&rt->dst, br_dst_default_metrics, true); |
d8d1f30b CG |
138 | rt->dst.flags = DST_NOXFRM; |
139 | rt->dst.ops = &fake_dst_ops; | |
4adf0af6 SW |
140 | } |
141 | ||
142 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
143 | { | |
b5ed54e9 | 144 | struct net_bridge_port *port; |
145 | ||
146 | port = br_port_get_rcu(dev); | |
147 | return port ? &port->br->fake_rtable : NULL; | |
4adf0af6 | 148 | } |
1da177e4 | 149 | |
5dce971a SH |
150 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
151 | { | |
b5ed54e9 | 152 | struct net_bridge_port *port; |
5dce971a | 153 | |
b5ed54e9 | 154 | port = br_port_get_rcu(dev); |
155 | return port ? port->br->dev : NULL; | |
5dce971a | 156 | } |
1da177e4 | 157 | |
fdeabdef SH |
158 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
159 | { | |
160 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
161 | if (likely(skb->nf_bridge)) | |
162 | atomic_set(&(skb->nf_bridge->use), 1); | |
163 | ||
164 | return skb->nf_bridge; | |
165 | } | |
166 | ||
2dc2f207 PM |
167 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
168 | { | |
169 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
170 | ||
171 | if (atomic_read(&nf_bridge->use) > 1) { | |
172 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
173 | ||
174 | if (tmp) { | |
175 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
176 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 177 | } |
4c3a76ab | 178 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
179 | nf_bridge = tmp; |
180 | } | |
181 | return nf_bridge; | |
182 | } | |
183 | ||
fc38582d PM |
184 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
185 | { | |
186 | unsigned int len = nf_bridge_encap_header_len(skb); | |
187 | ||
188 | skb_push(skb, len); | |
189 | skb->network_header -= len; | |
190 | } | |
191 | ||
192 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 193 | { |
fc38582d PM |
194 | unsigned int len = nf_bridge_encap_header_len(skb); |
195 | ||
196 | skb_pull(skb, len); | |
197 | skb->network_header += len; | |
198 | } | |
fdeabdef | 199 | |
fc38582d PM |
200 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
201 | { | |
202 | unsigned int len = nf_bridge_encap_header_len(skb); | |
203 | ||
204 | skb_pull_rcsum(skb, len); | |
205 | skb->network_header += len; | |
206 | } | |
207 | ||
208 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
209 | { | |
210 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 211 | |
d626f62b ACM |
212 | skb_copy_from_linear_data_offset(skb, -header_size, |
213 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
214 | } |
215 | ||
e179e632 BDS |
216 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
217 | { | |
218 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
219 | skb->protocol = htons(ETH_P_8021Q); | |
220 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
221 | skb->protocol = htons(ETH_P_PPP_SES); | |
222 | } | |
223 | ||
462fb2af BD |
224 | /* When handing a packet over to the IP layer |
225 | * check whether we have a skb that is in the | |
226 | * expected format | |
227 | */ | |
228 | ||
d0280232 | 229 | static int br_parse_ip_options(struct sk_buff *skb) |
462fb2af BD |
230 | { |
231 | struct ip_options *opt; | |
b71d1d42 | 232 | const struct iphdr *iph; |
462fb2af BD |
233 | struct net_device *dev = skb->dev; |
234 | u32 len; | |
235 | ||
236 | iph = ip_hdr(skb); | |
237 | opt = &(IPCB(skb)->opt); | |
238 | ||
239 | /* Basic sanity checks */ | |
240 | if (iph->ihl < 5 || iph->version != 4) | |
241 | goto inhdr_error; | |
242 | ||
243 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
244 | goto inhdr_error; | |
245 | ||
246 | iph = ip_hdr(skb); | |
247 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
248 | goto inhdr_error; | |
249 | ||
250 | len = ntohs(iph->tot_len); | |
251 | if (skb->len < len) { | |
252 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
253 | goto drop; | |
254 | } else if (len < (iph->ihl*4)) | |
255 | goto inhdr_error; | |
256 | ||
257 | if (pskb_trim_rcsum(skb, len)) { | |
258 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
259 | goto drop; | |
260 | } | |
261 | ||
f8e9881c ED |
262 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
263 | if (iph->ihl == 5) | |
462fb2af | 264 | return 0; |
462fb2af BD |
265 | |
266 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
267 | if (ip_options_compile(dev_net(dev), opt, skb)) | |
268 | goto inhdr_error; | |
269 | ||
270 | /* Check correct handling of SRR option */ | |
271 | if (unlikely(opt->srr)) { | |
272 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
273 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) | |
274 | goto drop; | |
275 | ||
276 | if (ip_options_rcv_srr(skb)) | |
277 | goto drop; | |
278 | } | |
279 | ||
280 | return 0; | |
281 | ||
282 | inhdr_error: | |
283 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
284 | drop: | |
285 | return -1; | |
286 | } | |
287 | ||
e179e632 BDS |
288 | /* Fill in the header for fragmented IP packets handled by |
289 | * the IPv4 connection tracking code. | |
07317621 SH |
290 | */ |
291 | int nf_bridge_copy_header(struct sk_buff *skb) | |
292 | { | |
293 | int err; | |
e179e632 | 294 | unsigned int header_size; |
07317621 | 295 | |
e179e632 BDS |
296 | nf_bridge_update_protocol(skb); |
297 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 298 | err = skb_cow_head(skb, header_size); |
07317621 SH |
299 | if (err) |
300 | return err; | |
301 | ||
27d7ff46 ACM |
302 | skb_copy_to_linear_data_offset(skb, -header_size, |
303 | skb->nf_bridge->data, header_size); | |
fc38582d | 304 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
305 | return 0; |
306 | } | |
307 | ||
1da177e4 LT |
308 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
309 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
310 | * bridge PRE_ROUTING hook. */ | |
311 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
312 | { | |
313 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 314 | struct rtable *rt; |
1da177e4 | 315 | |
1da177e4 LT |
316 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
317 | skb->pkt_type = PACKET_OTHERHOST; | |
318 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
319 | } | |
320 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
321 | ||
511c3f92 ED |
322 | rt = bridge_parent_rtable(nf_bridge->physindev); |
323 | if (!rt) { | |
4adf0af6 SW |
324 | kfree_skb(skb); |
325 | return 0; | |
326 | } | |
f9181f4f | 327 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
328 | |
329 | skb->dev = nf_bridge->physindev; | |
e179e632 | 330 | nf_bridge_update_protocol(skb); |
fc38582d | 331 | nf_bridge_push_encap_header(skb); |
713aefa3 | 332 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
333 | br_handle_frame_finish, 1); |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
e179e632 BDS |
338 | /* Obtain the correct destination MAC address, while preserving the original |
339 | * source MAC address. If we already know this address, we just copy it. If we | |
340 | * don't, we use the neighbour framework to find out. In both cases, we make | |
341 | * sure that br_handle_frame_finish() is called afterwards. | |
342 | */ | |
343 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
344 | { | |
345 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
f6b72b62 | 346 | struct neighbour *neigh; |
e179e632 BDS |
347 | struct dst_entry *dst; |
348 | ||
349 | skb->dev = bridge_parent(skb->dev); | |
350 | if (!skb->dev) | |
351 | goto free_skb; | |
352 | dst = skb_dst(skb); | |
f6b72b62 DM |
353 | neigh = dst->neighbour; |
354 | if (neigh->hh.hh_len) { | |
355 | neigh_hh_bridge(&neigh->hh, skb); | |
e179e632 BDS |
356 | skb->dev = nf_bridge->physindev; |
357 | return br_handle_frame_finish(skb); | |
8f40b161 | 358 | } else { |
e179e632 BDS |
359 | /* the neighbour function below overwrites the complete |
360 | * MAC header, so we save the Ethernet source address and | |
361 | * protocol number. */ | |
362 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
363 | /* tell br_dev_xmit to continue with forwarding */ | |
364 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
8f40b161 | 365 | return neigh->output(neigh, skb); |
e179e632 BDS |
366 | } |
367 | free_skb: | |
368 | kfree_skb(skb); | |
369 | return 0; | |
370 | } | |
371 | ||
1da177e4 | 372 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 373 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
374 | * |
375 | * There are two cases to consider: | |
376 | * 1. The packet was DNAT'ed to a device in the same bridge | |
377 | * port group as it was received on. We can still bridge | |
378 | * the packet. | |
379 | * 2. The packet was DNAT'ed to a different device, either | |
380 | * a non-bridged device or another bridge port group. | |
381 | * The packet will need to be routed. | |
382 | * | |
383 | * The correct way of distinguishing between these two cases is to | |
384 | * call ip_route_input() and to look at skb->dst->dev, which is | |
385 | * changed to the destination device if ip_route_input() succeeds. | |
386 | * | |
ea2d9b41 | 387 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 388 | * |
ea2d9b41 BDS |
389 | * If the output device equals the logical bridge device the packet |
390 | * came in on, we can consider this bridging. The corresponding MAC | |
391 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
392 | * Otherwise, the packet is considered to be routed and we just |
393 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
394 | * later be passed up to the IP stack to be routed. For a redirected |
395 | * packet, ip_route_input() will give back the localhost as output device, | |
396 | * which differs from the bridge device. | |
1da177e4 | 397 | * |
ea2d9b41 | 398 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 399 | * |
f216f082 BDS |
400 | * This can be because the destination address is martian, in which case |
401 | * the packet will be dropped. | |
ea2d9b41 BDS |
402 | * If IP forwarding is disabled, ip_route_input() will fail, while |
403 | * ip_route_output_key() can return success. The source | |
404 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 405 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
406 | * if IP forwarding is enabled. If the output device equals the logical bridge |
407 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
408 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
409 | */ | |
1da177e4 LT |
410 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
411 | { | |
412 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 413 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 414 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 415 | struct rtable *rt; |
f216f082 | 416 | int err; |
1da177e4 | 417 | |
1da177e4 LT |
418 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
419 | skb->pkt_type = PACKET_OTHERHOST; | |
420 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
421 | } | |
422 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 423 | if (dnat_took_place(skb)) { |
f216f082 | 424 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 425 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
426 | |
427 | /* If err equals -EHOSTUNREACH the error is due to a | |
428 | * martian destination or due to the fact that | |
429 | * forwarding is disabled. For most martian packets, | |
430 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
431 | * martian destinations: loopback destinations and destination | |
432 | * 0.0.0.0. In both cases the packet will be dropped because the | |
433 | * destination is the loopback device and not the bridge. */ | |
434 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
435 | goto free_skb; | |
1da177e4 | 436 | |
78fbfd8a DM |
437 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
438 | RT_TOS(iph->tos), 0); | |
b23dd4fe | 439 | if (!IS_ERR(rt)) { |
1c011bed | 440 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 441 | * require ip_forwarding. */ |
b23dd4fe DM |
442 | if (rt->dst.dev == dev) { |
443 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
444 | goto bridged_dnat; |
445 | } | |
b23dd4fe | 446 | ip_rt_put(rt); |
1da177e4 | 447 | } |
f216f082 | 448 | free_skb: |
1da177e4 LT |
449 | kfree_skb(skb); |
450 | return 0; | |
451 | } else { | |
adf30907 | 452 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 453 | bridged_dnat: |
1da177e4 | 454 | skb->dev = nf_bridge->physindev; |
e179e632 | 455 | nf_bridge_update_protocol(skb); |
fc38582d | 456 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
457 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
458 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
459 | skb, skb->dev, NULL, |
460 | br_nf_pre_routing_finish_bridge, | |
461 | 1); | |
462 | return 0; | |
463 | } | |
789bc3e5 | 464 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
465 | skb->pkt_type = PACKET_HOST; |
466 | } | |
467 | } else { | |
511c3f92 ED |
468 | rt = bridge_parent_rtable(nf_bridge->physindev); |
469 | if (!rt) { | |
4adf0af6 SW |
470 | kfree_skb(skb); |
471 | return 0; | |
472 | } | |
f9181f4f | 473 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
474 | } |
475 | ||
476 | skb->dev = nf_bridge->physindev; | |
e179e632 | 477 | nf_bridge_update_protocol(skb); |
fc38582d | 478 | nf_bridge_push_encap_header(skb); |
713aefa3 | 479 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
480 | br_handle_frame_finish, 1); |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 486 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
487 | { |
488 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
489 | ||
490 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
491 | skb->pkt_type = PACKET_HOST; | |
492 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
493 | } | |
494 | ||
495 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
496 | nf_bridge->physindev = skb->dev; | |
497 | skb->dev = bridge_parent(skb->dev); | |
e179e632 BDS |
498 | if (skb->protocol == htons(ETH_P_8021Q)) |
499 | nf_bridge->mask |= BRNF_8021Q; | |
500 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
501 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
502 | |
503 | return skb->dev; | |
1da177e4 LT |
504 | } |
505 | ||
506 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
507 | static int check_hbh_len(struct sk_buff *skb) | |
508 | { | |
0660e03f | 509 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 510 | u32 pkt_len; |
d56f90a7 ACM |
511 | const unsigned char *nh = skb_network_header(skb); |
512 | int off = raw - nh; | |
789bc3e5 | 513 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
514 | |
515 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
516 | goto bad; | |
517 | ||
518 | off += 2; | |
519 | len -= 2; | |
520 | ||
521 | while (len > 0) { | |
d56f90a7 | 522 | int optlen = nh[off + 1] + 2; |
1da177e4 | 523 | |
d56f90a7 | 524 | switch (nh[off]) { |
1da177e4 LT |
525 | case IPV6_TLV_PAD0: |
526 | optlen = 1; | |
527 | break; | |
528 | ||
529 | case IPV6_TLV_PADN: | |
530 | break; | |
531 | ||
532 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 533 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 534 | goto bad; |
d56f90a7 | 535 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 536 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 537 | ipv6_hdr(skb)->payload_len) |
b0366486 | 538 | goto bad; |
1da177e4 LT |
539 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
540 | goto bad; | |
b0366486 | 541 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 542 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 543 | goto bad; |
d56f90a7 | 544 | nh = skb_network_header(skb); |
1da177e4 LT |
545 | break; |
546 | default: | |
547 | if (optlen > len) | |
548 | goto bad; | |
549 | break; | |
550 | } | |
551 | off += optlen; | |
552 | len -= optlen; | |
553 | } | |
554 | if (len == 0) | |
555 | return 0; | |
556 | bad: | |
557 | return -1; | |
558 | ||
559 | } | |
560 | ||
561 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
562 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
563 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
564 | struct sk_buff *skb, |
565 | const struct net_device *in, | |
566 | const struct net_device *out, | |
567 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 568 | { |
b71d1d42 | 569 | const struct ipv6hdr *hdr; |
1da177e4 | 570 | u32 pkt_len; |
1da177e4 LT |
571 | |
572 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 573 | return NF_DROP; |
1da177e4 LT |
574 | |
575 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 576 | return NF_DROP; |
1da177e4 | 577 | |
0660e03f | 578 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
579 | |
580 | if (hdr->version != 6) | |
deef4b52 | 581 | return NF_DROP; |
1da177e4 LT |
582 | |
583 | pkt_len = ntohs(hdr->payload_len); | |
584 | ||
585 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
586 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 587 | return NF_DROP; |
b38dfee3 | 588 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 589 | return NF_DROP; |
1da177e4 LT |
590 | } |
591 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 592 | return NF_DROP; |
1da177e4 | 593 | |
789bc3e5 | 594 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 595 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 596 | return NF_DROP; |
5dce971a SH |
597 | if (!setup_pre_routing(skb)) |
598 | return NF_DROP; | |
1da177e4 | 599 | |
e179e632 | 600 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 601 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
602 | br_nf_pre_routing_finish_ipv6); |
603 | ||
604 | return NF_STOLEN; | |
1da177e4 LT |
605 | } |
606 | ||
607 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
608 | * Replicate the checks that IPv4 does on packet reception. | |
609 | * Set skb->dev to the bridge device (i.e. parent of the | |
610 | * receiving device) to make netfilter happy, the REDIRECT | |
611 | * target in particular. Save the original destination IP | |
612 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 613 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
614 | const struct net_device *in, |
615 | const struct net_device *out, | |
616 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 617 | { |
4df53d8b PM |
618 | struct net_bridge_port *p; |
619 | struct net_bridge *br; | |
e7c243c9 EP |
620 | __u32 len = nf_bridge_encap_header_len(skb); |
621 | ||
e7c243c9 | 622 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 623 | return NF_DROP; |
1da177e4 | 624 | |
e490c1de | 625 | p = br_port_get_rcu(in); |
4df53d8b | 626 | if (p == NULL) |
deef4b52 | 627 | return NF_DROP; |
4df53d8b PM |
628 | br = p->br; |
629 | ||
516299d2 MM |
630 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
631 | IS_PPPOE_IPV6(skb)) { | |
4df53d8b | 632 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 633 | return NF_ACCEPT; |
4df53d8b | 634 | |
fc38582d | 635 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
636 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
637 | } | |
4df53d8b PM |
638 | |
639 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 640 | return NF_ACCEPT; |
1da177e4 | 641 | |
516299d2 MM |
642 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
643 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
644 | return NF_ACCEPT; |
645 | ||
fc38582d | 646 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 647 | |
462fb2af | 648 | if (br_parse_ip_options(skb)) |
deef4b52 | 649 | return NF_DROP; |
17762060 | 650 | |
789bc3e5 | 651 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 652 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 653 | return NF_DROP; |
5dce971a SH |
654 | if (!setup_pre_routing(skb)) |
655 | return NF_DROP; | |
1da177e4 | 656 | store_orig_dstaddr(skb); |
e179e632 | 657 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 658 | |
713aefa3 | 659 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
660 | br_nf_pre_routing_finish); |
661 | ||
662 | return NF_STOLEN; | |
1da177e4 LT |
663 | } |
664 | ||
665 | ||
666 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
667 | /* The packet is locally destined, which requires a real | |
668 | * dst_entry, so detach the fake one. On the way up, the | |
669 | * packet would pass through PRE_ROUTING again (which already | |
670 | * took place when the packet entered the bridge), but we | |
671 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
672 | * prevent this from happening. */ | |
3db05fea | 673 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
674 | const struct net_device *in, |
675 | const struct net_device *out, | |
676 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 677 | { |
511c3f92 ED |
678 | struct rtable *rt = skb_rtable(skb); |
679 | ||
adf30907 ED |
680 | if (rt && rt == bridge_parent_rtable(in)) |
681 | skb_dst_drop(skb); | |
1da177e4 LT |
682 | |
683 | return NF_ACCEPT; | |
684 | } | |
685 | ||
1da177e4 LT |
686 | /* PF_BRIDGE/FORWARD *************************************************/ |
687 | static int br_nf_forward_finish(struct sk_buff *skb) | |
688 | { | |
689 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
690 | struct net_device *in; | |
1da177e4 | 691 | |
8b42ec39 | 692 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
693 | in = nf_bridge->physindev; |
694 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
695 | skb->pkt_type = PACKET_OTHERHOST; | |
696 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
697 | } | |
e94c6743 | 698 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
699 | } else { |
700 | in = *((struct net_device **)(skb->cb)); | |
701 | } | |
fc38582d | 702 | nf_bridge_push_encap_header(skb); |
e179e632 | 703 | |
713aefa3 | 704 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 705 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
706 | return 0; |
707 | } | |
708 | ||
709 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
710 | * netfilter with indev and outdev set to the bridge device, | |
711 | * but we are still able to filter on the 'real' indev/outdev | |
712 | * because of the physdev module. For ARP, indev and outdev are the | |
713 | * bridge ports. */ | |
3db05fea | 714 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
715 | const struct net_device *in, |
716 | const struct net_device *out, | |
717 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 718 | { |
1da177e4 | 719 | struct nf_bridge_info *nf_bridge; |
5dce971a | 720 | struct net_device *parent; |
76108cea | 721 | u_int8_t pf; |
1da177e4 LT |
722 | |
723 | if (!skb->nf_bridge) | |
724 | return NF_ACCEPT; | |
725 | ||
2dc2f207 PM |
726 | /* Need exclusive nf_bridge_info since we might have multiple |
727 | * different physoutdevs. */ | |
728 | if (!nf_bridge_unshare(skb)) | |
729 | return NF_DROP; | |
730 | ||
5dce971a SH |
731 | parent = bridge_parent(out); |
732 | if (!parent) | |
733 | return NF_DROP; | |
734 | ||
516299d2 MM |
735 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
736 | IS_PPPOE_IP(skb)) | |
1da177e4 | 737 | pf = PF_INET; |
a2bd40ad HX |
738 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
739 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 740 | pf = PF_INET6; |
a2bd40ad HX |
741 | else |
742 | return NF_ACCEPT; | |
1da177e4 | 743 | |
3db05fea | 744 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 745 | |
1da177e4 LT |
746 | nf_bridge = skb->nf_bridge; |
747 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
748 | skb->pkt_type = PACKET_HOST; | |
749 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
750 | } | |
751 | ||
cb685528 | 752 | if (pf == PF_INET && br_parse_ip_options(skb)) |
6b1e960f HX |
753 | return NF_DROP; |
754 | ||
1da177e4 LT |
755 | /* The physdev module checks on this */ |
756 | nf_bridge->mask |= BRNF_BRIDGED; | |
757 | nf_bridge->physoutdev = skb->dev; | |
e179e632 BDS |
758 | if (pf == PF_INET) |
759 | skb->protocol = htons(ETH_P_IP); | |
760 | else | |
761 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 762 | |
6e23ae2a | 763 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 764 | br_nf_forward_finish); |
1da177e4 LT |
765 | |
766 | return NF_STOLEN; | |
767 | } | |
768 | ||
3db05fea | 769 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
770 | const struct net_device *in, |
771 | const struct net_device *out, | |
772 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 773 | { |
4df53d8b PM |
774 | struct net_bridge_port *p; |
775 | struct net_bridge *br; | |
1da177e4 LT |
776 | struct net_device **d = (struct net_device **)(skb->cb); |
777 | ||
e490c1de | 778 | p = br_port_get_rcu(out); |
4df53d8b PM |
779 | if (p == NULL) |
780 | return NF_ACCEPT; | |
781 | br = p->br; | |
782 | ||
783 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 784 | return NF_ACCEPT; |
1da177e4 | 785 | |
f8a26028 | 786 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 787 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 788 | return NF_ACCEPT; |
3db05fea | 789 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
790 | } |
791 | ||
d0a92be0 | 792 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 793 | if (IS_VLAN_ARP(skb)) |
3db05fea | 794 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
795 | return NF_ACCEPT; |
796 | } | |
797 | *d = (struct net_device *)in; | |
fdc9314c | 798 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
799 | (struct net_device *)out, br_nf_forward_finish); |
800 | ||
801 | return NF_STOLEN; | |
802 | } | |
803 | ||
c197facc | 804 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
2e2f7aef PM |
805 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
806 | { | |
462fb2af BD |
807 | int ret; |
808 | ||
e179e632 | 809 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 810 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 811 | !skb_is_gso(skb)) { |
462fb2af BD |
812 | if (br_parse_ip_options(skb)) |
813 | /* Drop invalid packet */ | |
814 | return NF_DROP; | |
815 | ret = ip_fragment(skb, br_dev_queue_push_xmit); | |
87f94b4e | 816 | } else |
462fb2af BD |
817 | ret = br_dev_queue_push_xmit(skb); |
818 | ||
819 | return ret; | |
2e2f7aef | 820 | } |
c197facc | 821 | #else |
822 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
823 | { | |
824 | return br_dev_queue_push_xmit(skb); | |
825 | } | |
826 | #endif | |
1da177e4 LT |
827 | |
828 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 829 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
830 | const struct net_device *in, |
831 | const struct net_device *out, | |
832 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 833 | { |
3db05fea | 834 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 835 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 836 | u_int8_t pf; |
1da177e4 | 837 | |
ea2d9b41 | 838 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
839 | return NF_ACCEPT; |
840 | ||
5dce971a SH |
841 | if (!realoutdev) |
842 | return NF_DROP; | |
843 | ||
516299d2 MM |
844 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
845 | IS_PPPOE_IP(skb)) | |
1da177e4 | 846 | pf = PF_INET; |
a2bd40ad HX |
847 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
848 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 849 | pf = PF_INET6; |
a2bd40ad HX |
850 | else |
851 | return NF_ACCEPT; | |
1da177e4 | 852 | |
1da177e4 LT |
853 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
854 | * about the value of skb->pkt_type. */ | |
855 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
856 | skb->pkt_type = PACKET_HOST; | |
857 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
858 | } | |
859 | ||
fc38582d | 860 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 861 | nf_bridge_save_header(skb); |
e179e632 BDS |
862 | if (pf == PF_INET) |
863 | skb->protocol = htons(ETH_P_IP); | |
864 | else | |
865 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 866 | |
6e23ae2a | 867 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 868 | br_nf_dev_queue_xmit); |
1da177e4 LT |
869 | |
870 | return NF_STOLEN; | |
1da177e4 LT |
871 | } |
872 | ||
1da177e4 LT |
873 | /* IP/SABOTAGE *****************************************************/ |
874 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
875 | * for the second time. */ | |
3db05fea | 876 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
877 | const struct net_device *in, |
878 | const struct net_device *out, | |
879 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 880 | { |
3db05fea HX |
881 | if (skb->nf_bridge && |
882 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
883 | return NF_STOP; |
884 | } | |
885 | ||
886 | return NF_ACCEPT; | |
887 | } | |
888 | ||
ea2d9b41 BDS |
889 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
890 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 891 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
892 | { |
893 | .hook = br_nf_pre_routing, | |
894 | .owner = THIS_MODULE, | |
895 | .pf = PF_BRIDGE, | |
896 | .hooknum = NF_BR_PRE_ROUTING, | |
897 | .priority = NF_BR_PRI_BRNF, | |
898 | }, | |
899 | { | |
900 | .hook = br_nf_local_in, | |
901 | .owner = THIS_MODULE, | |
902 | .pf = PF_BRIDGE, | |
903 | .hooknum = NF_BR_LOCAL_IN, | |
904 | .priority = NF_BR_PRI_BRNF, | |
905 | }, | |
906 | { | |
907 | .hook = br_nf_forward_ip, | |
908 | .owner = THIS_MODULE, | |
909 | .pf = PF_BRIDGE, | |
910 | .hooknum = NF_BR_FORWARD, | |
911 | .priority = NF_BR_PRI_BRNF - 1, | |
912 | }, | |
913 | { | |
914 | .hook = br_nf_forward_arp, | |
915 | .owner = THIS_MODULE, | |
916 | .pf = PF_BRIDGE, | |
917 | .hooknum = NF_BR_FORWARD, | |
918 | .priority = NF_BR_PRI_BRNF, | |
919 | }, | |
1490fd89 CG |
920 | { |
921 | .hook = br_nf_post_routing, | |
922 | .owner = THIS_MODULE, | |
923 | .pf = PF_BRIDGE, | |
924 | .hooknum = NF_BR_POST_ROUTING, | |
925 | .priority = NF_BR_PRI_LAST, | |
926 | }, | |
927 | { | |
928 | .hook = ip_sabotage_in, | |
929 | .owner = THIS_MODULE, | |
930 | .pf = PF_INET, | |
931 | .hooknum = NF_INET_PRE_ROUTING, | |
932 | .priority = NF_IP_PRI_FIRST, | |
933 | }, | |
934 | { | |
935 | .hook = ip_sabotage_in, | |
936 | .owner = THIS_MODULE, | |
937 | .pf = PF_INET6, | |
938 | .hooknum = NF_INET_PRE_ROUTING, | |
939 | .priority = NF_IP6_PRI_FIRST, | |
940 | }, | |
1da177e4 LT |
941 | }; |
942 | ||
943 | #ifdef CONFIG_SYSCTL | |
944 | static | |
8d65af78 | 945 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 946 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
947 | { |
948 | int ret; | |
949 | ||
8d65af78 | 950 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
951 | |
952 | if (write && *(int *)(ctl->data)) | |
953 | *(int *)(ctl->data) = 1; | |
954 | return ret; | |
955 | } | |
956 | ||
957 | static ctl_table brnf_table[] = { | |
958 | { | |
1da177e4 LT |
959 | .procname = "bridge-nf-call-arptables", |
960 | .data = &brnf_call_arptables, | |
961 | .maxlen = sizeof(int), | |
962 | .mode = 0644, | |
6d9f239a | 963 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
964 | }, |
965 | { | |
1da177e4 LT |
966 | .procname = "bridge-nf-call-iptables", |
967 | .data = &brnf_call_iptables, | |
968 | .maxlen = sizeof(int), | |
969 | .mode = 0644, | |
6d9f239a | 970 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
971 | }, |
972 | { | |
1da177e4 LT |
973 | .procname = "bridge-nf-call-ip6tables", |
974 | .data = &brnf_call_ip6tables, | |
975 | .maxlen = sizeof(int), | |
976 | .mode = 0644, | |
6d9f239a | 977 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
978 | }, |
979 | { | |
1da177e4 LT |
980 | .procname = "bridge-nf-filter-vlan-tagged", |
981 | .data = &brnf_filter_vlan_tagged, | |
982 | .maxlen = sizeof(int), | |
983 | .mode = 0644, | |
6d9f239a | 984 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
985 | }, |
986 | { | |
516299d2 MM |
987 | .procname = "bridge-nf-filter-pppoe-tagged", |
988 | .data = &brnf_filter_pppoe_tagged, | |
989 | .maxlen = sizeof(int), | |
990 | .mode = 0644, | |
6d9f239a | 991 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 992 | }, |
f8572d8f | 993 | { } |
1da177e4 LT |
994 | }; |
995 | ||
b5ccd792 | 996 | static struct ctl_path brnf_path[] = { |
f8572d8f EB |
997 | { .procname = "net", }, |
998 | { .procname = "bridge", }, | |
b5ccd792 | 999 | { } |
1da177e4 LT |
1000 | }; |
1001 | #endif | |
1002 | ||
5eb87f45 | 1003 | int __init br_netfilter_init(void) |
1da177e4 | 1004 | { |
5eb87f45 | 1005 | int ret; |
1da177e4 | 1006 | |
fc66f95c | 1007 | ret = dst_entries_init(&fake_dst_ops); |
5eb87f45 | 1008 | if (ret < 0) |
1da177e4 | 1009 | return ret; |
fc66f95c ED |
1010 | |
1011 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
1012 | if (ret < 0) { | |
1013 | dst_entries_destroy(&fake_dst_ops); | |
1014 | return ret; | |
1015 | } | |
1da177e4 | 1016 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 1017 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 1018 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1019 | printk(KERN_WARNING |
1020 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 | 1021 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
fc66f95c | 1022 | dst_entries_destroy(&fake_dst_ops); |
5eb87f45 | 1023 | return -ENOMEM; |
1da177e4 LT |
1024 | } |
1025 | #endif | |
1da177e4 | 1026 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1027 | return 0; |
1028 | } | |
1029 | ||
1030 | void br_netfilter_fini(void) | |
1031 | { | |
5eb87f45 | 1032 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
1033 | #ifdef CONFIG_SYSCTL |
1034 | unregister_sysctl_table(brnf_sysctl_header); | |
1035 | #endif | |
fc66f95c | 1036 | dst_entries_destroy(&fake_dst_ops); |
1da177e4 | 1037 | } |