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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
8237908e BDS |
6 | * Lennert Buytenhek <buytenh@gnu.org> |
7 | * Bart De Schuymer <bdschuym@pandora.be> | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Lennert dedicates this file to Kerstin Wurdinger. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <linux/ip.h> |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/skbuff.h> | |
14c85021 | 23 | #include <linux/if_arp.h> |
1da177e4 LT |
24 | #include <linux/if_ether.h> |
25 | #include <linux/if_vlan.h> | |
516299d2 MM |
26 | #include <linux/if_pppox.h> |
27 | #include <linux/ppp_defs.h> | |
1da177e4 LT |
28 | #include <linux/netfilter_bridge.h> |
29 | #include <linux/netfilter_ipv4.h> | |
30 | #include <linux/netfilter_ipv6.h> | |
31 | #include <linux/netfilter_arp.h> | |
32 | #include <linux/in_route.h> | |
f216f082 | 33 | #include <linux/inetdevice.h> |
14c85021 | 34 | |
1da177e4 LT |
35 | #include <net/ip.h> |
36 | #include <net/ipv6.h> | |
14c85021 ACM |
37 | #include <net/route.h> |
38 | ||
1da177e4 | 39 | #include <asm/uaccess.h> |
1da177e4 LT |
40 | #include "br_private.h" |
41 | #ifdef CONFIG_SYSCTL | |
42 | #include <linux/sysctl.h> | |
43 | #endif | |
44 | ||
45 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
46 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
47 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
48 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 49 | |
1da177e4 LT |
50 | #ifdef CONFIG_SYSCTL |
51 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
52 | static int brnf_call_iptables __read_mostly = 1; |
53 | static int brnf_call_ip6tables __read_mostly = 1; | |
54 | static int brnf_call_arptables __read_mostly = 1; | |
47e0e1ca HX |
55 | static int brnf_filter_vlan_tagged __read_mostly = 0; |
56 | static int brnf_filter_pppoe_tagged __read_mostly = 0; | |
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 | ||
107 | static struct dst_ops fake_dst_ops = { | |
108 | .family = AF_INET, | |
09640e63 | 109 | .protocol = cpu_to_be16(ETH_P_IP), |
631339f1 | 110 | .update_pmtu = fake_update_pmtu, |
631339f1 HX |
111 | }; |
112 | ||
4adf0af6 SW |
113 | /* |
114 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
115 | * Currently, we fill in the PMTU entry because netfilter |
116 | * refragmentation needs it, and the rt_flags entry because | |
117 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
118 | * require us to fill additional fields. |
119 | */ | |
120 | void br_netfilter_rtable_init(struct net_bridge *br) | |
121 | { | |
122 | struct rtable *rt = &br->fake_rtable; | |
123 | ||
d8d1f30b CG |
124 | atomic_set(&rt->dst.__refcnt, 1); |
125 | rt->dst.dev = br->dev; | |
126 | rt->dst.path = &rt->dst; | |
defb3519 | 127 | dst_metric_set(&rt->dst, RTAX_MTU, 1500); |
d8d1f30b CG |
128 | rt->dst.flags = DST_NOXFRM; |
129 | rt->dst.ops = &fake_dst_ops; | |
4adf0af6 SW |
130 | } |
131 | ||
132 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
133 | { | |
b5ed54e9 | 134 | struct net_bridge_port *port; |
135 | ||
136 | port = br_port_get_rcu(dev); | |
137 | return port ? &port->br->fake_rtable : NULL; | |
4adf0af6 | 138 | } |
1da177e4 | 139 | |
5dce971a SH |
140 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
141 | { | |
b5ed54e9 | 142 | struct net_bridge_port *port; |
5dce971a | 143 | |
b5ed54e9 | 144 | port = br_port_get_rcu(dev); |
145 | return port ? port->br->dev : NULL; | |
5dce971a | 146 | } |
1da177e4 | 147 | |
fdeabdef SH |
148 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
149 | { | |
150 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
151 | if (likely(skb->nf_bridge)) | |
152 | atomic_set(&(skb->nf_bridge->use), 1); | |
153 | ||
154 | return skb->nf_bridge; | |
155 | } | |
156 | ||
2dc2f207 PM |
157 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
158 | { | |
159 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
160 | ||
161 | if (atomic_read(&nf_bridge->use) > 1) { | |
162 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
163 | ||
164 | if (tmp) { | |
165 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
166 | atomic_set(&tmp->use, 1); | |
2dc2f207 | 167 | } |
4c3a76ab | 168 | nf_bridge_put(nf_bridge); |
2dc2f207 PM |
169 | nf_bridge = tmp; |
170 | } | |
171 | return nf_bridge; | |
172 | } | |
173 | ||
fc38582d PM |
174 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
175 | { | |
176 | unsigned int len = nf_bridge_encap_header_len(skb); | |
177 | ||
178 | skb_push(skb, len); | |
179 | skb->network_header -= len; | |
180 | } | |
181 | ||
182 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 183 | { |
fc38582d PM |
184 | unsigned int len = nf_bridge_encap_header_len(skb); |
185 | ||
186 | skb_pull(skb, len); | |
187 | skb->network_header += len; | |
188 | } | |
fdeabdef | 189 | |
fc38582d PM |
190 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
191 | { | |
192 | unsigned int len = nf_bridge_encap_header_len(skb); | |
193 | ||
194 | skb_pull_rcsum(skb, len); | |
195 | skb->network_header += len; | |
196 | } | |
197 | ||
198 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
199 | { | |
200 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 201 | |
d626f62b ACM |
202 | skb_copy_from_linear_data_offset(skb, -header_size, |
203 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
204 | } |
205 | ||
e179e632 BDS |
206 | static inline void nf_bridge_update_protocol(struct sk_buff *skb) |
207 | { | |
208 | if (skb->nf_bridge->mask & BRNF_8021Q) | |
209 | skb->protocol = htons(ETH_P_8021Q); | |
210 | else if (skb->nf_bridge->mask & BRNF_PPPoE) | |
211 | skb->protocol = htons(ETH_P_PPP_SES); | |
212 | } | |
213 | ||
462fb2af BD |
214 | /* When handing a packet over to the IP layer |
215 | * check whether we have a skb that is in the | |
216 | * expected format | |
217 | */ | |
218 | ||
d0280232 | 219 | static int br_parse_ip_options(struct sk_buff *skb) |
462fb2af BD |
220 | { |
221 | struct ip_options *opt; | |
222 | struct iphdr *iph; | |
223 | struct net_device *dev = skb->dev; | |
224 | u32 len; | |
225 | ||
226 | iph = ip_hdr(skb); | |
227 | opt = &(IPCB(skb)->opt); | |
228 | ||
229 | /* Basic sanity checks */ | |
230 | if (iph->ihl < 5 || iph->version != 4) | |
231 | goto inhdr_error; | |
232 | ||
233 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
234 | goto inhdr_error; | |
235 | ||
236 | iph = ip_hdr(skb); | |
237 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
238 | goto inhdr_error; | |
239 | ||
240 | len = ntohs(iph->tot_len); | |
241 | if (skb->len < len) { | |
242 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INTRUNCATEDPKTS); | |
243 | goto drop; | |
244 | } else if (len < (iph->ihl*4)) | |
245 | goto inhdr_error; | |
246 | ||
247 | if (pskb_trim_rcsum(skb, len)) { | |
248 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INDISCARDS); | |
249 | goto drop; | |
250 | } | |
251 | ||
f8e9881c ED |
252 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
253 | if (iph->ihl == 5) | |
462fb2af | 254 | return 0; |
462fb2af BD |
255 | |
256 | opt->optlen = iph->ihl*4 - sizeof(struct iphdr); | |
257 | if (ip_options_compile(dev_net(dev), opt, skb)) | |
258 | goto inhdr_error; | |
259 | ||
260 | /* Check correct handling of SRR option */ | |
261 | if (unlikely(opt->srr)) { | |
262 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
263 | if (in_dev && !IN_DEV_SOURCE_ROUTE(in_dev)) | |
264 | goto drop; | |
265 | ||
266 | if (ip_options_rcv_srr(skb)) | |
267 | goto drop; | |
268 | } | |
269 | ||
270 | return 0; | |
271 | ||
272 | inhdr_error: | |
273 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_INHDRERRORS); | |
274 | drop: | |
275 | return -1; | |
276 | } | |
277 | ||
e179e632 BDS |
278 | /* Fill in the header for fragmented IP packets handled by |
279 | * the IPv4 connection tracking code. | |
07317621 SH |
280 | */ |
281 | int nf_bridge_copy_header(struct sk_buff *skb) | |
282 | { | |
283 | int err; | |
e179e632 | 284 | unsigned int header_size; |
07317621 | 285 | |
e179e632 BDS |
286 | nf_bridge_update_protocol(skb); |
287 | header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
d9cc2048 | 288 | err = skb_cow_head(skb, header_size); |
07317621 SH |
289 | if (err) |
290 | return err; | |
291 | ||
27d7ff46 ACM |
292 | skb_copy_to_linear_data_offset(skb, -header_size, |
293 | skb->nf_bridge->data, header_size); | |
fc38582d | 294 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
295 | return 0; |
296 | } | |
297 | ||
1da177e4 LT |
298 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
299 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
300 | * bridge PRE_ROUTING hook. */ | |
301 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
302 | { | |
303 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
511c3f92 | 304 | struct rtable *rt; |
1da177e4 | 305 | |
1da177e4 LT |
306 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
307 | skb->pkt_type = PACKET_OTHERHOST; | |
308 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
309 | } | |
310 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
311 | ||
511c3f92 ED |
312 | rt = bridge_parent_rtable(nf_bridge->physindev); |
313 | if (!rt) { | |
4adf0af6 SW |
314 | kfree_skb(skb); |
315 | return 0; | |
316 | } | |
f9181f4f | 317 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
318 | |
319 | skb->dev = nf_bridge->physindev; | |
e179e632 | 320 | nf_bridge_update_protocol(skb); |
fc38582d | 321 | nf_bridge_push_encap_header(skb); |
713aefa3 | 322 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
323 | br_handle_frame_finish, 1); |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
e179e632 BDS |
328 | /* Obtain the correct destination MAC address, while preserving the original |
329 | * source MAC address. If we already know this address, we just copy it. If we | |
330 | * don't, we use the neighbour framework to find out. In both cases, we make | |
331 | * sure that br_handle_frame_finish() is called afterwards. | |
332 | */ | |
333 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
334 | { | |
335 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
336 | struct dst_entry *dst; | |
337 | ||
338 | skb->dev = bridge_parent(skb->dev); | |
339 | if (!skb->dev) | |
340 | goto free_skb; | |
341 | dst = skb_dst(skb); | |
342 | if (dst->hh) { | |
343 | neigh_hh_bridge(dst->hh, skb); | |
344 | skb->dev = nf_bridge->physindev; | |
345 | return br_handle_frame_finish(skb); | |
346 | } else if (dst->neighbour) { | |
347 | /* the neighbour function below overwrites the complete | |
348 | * MAC header, so we save the Ethernet source address and | |
349 | * protocol number. */ | |
350 | skb_copy_from_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN), skb->nf_bridge->data, ETH_HLEN-ETH_ALEN); | |
351 | /* tell br_dev_xmit to continue with forwarding */ | |
352 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
353 | return dst->neighbour->output(skb); | |
354 | } | |
355 | free_skb: | |
356 | kfree_skb(skb); | |
357 | return 0; | |
358 | } | |
359 | ||
1da177e4 | 360 | /* This requires some explaining. If DNAT has taken place, |
ea2d9b41 | 361 | * we will need to fix up the destination Ethernet address. |
1da177e4 LT |
362 | * |
363 | * There are two cases to consider: | |
364 | * 1. The packet was DNAT'ed to a device in the same bridge | |
365 | * port group as it was received on. We can still bridge | |
366 | * the packet. | |
367 | * 2. The packet was DNAT'ed to a different device, either | |
368 | * a non-bridged device or another bridge port group. | |
369 | * The packet will need to be routed. | |
370 | * | |
371 | * The correct way of distinguishing between these two cases is to | |
372 | * call ip_route_input() and to look at skb->dst->dev, which is | |
373 | * changed to the destination device if ip_route_input() succeeds. | |
374 | * | |
ea2d9b41 | 375 | * Let's first consider the case that ip_route_input() succeeds: |
1da177e4 | 376 | * |
ea2d9b41 BDS |
377 | * If the output device equals the logical bridge device the packet |
378 | * came in on, we can consider this bridging. The corresponding MAC | |
379 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
1da177e4 LT |
380 | * Otherwise, the packet is considered to be routed and we just |
381 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
382 | * later be passed up to the IP stack to be routed. For a redirected |
383 | * packet, ip_route_input() will give back the localhost as output device, | |
384 | * which differs from the bridge device. | |
1da177e4 | 385 | * |
ea2d9b41 | 386 | * Let's now consider the case that ip_route_input() fails: |
1da177e4 | 387 | * |
f216f082 BDS |
388 | * This can be because the destination address is martian, in which case |
389 | * the packet will be dropped. | |
ea2d9b41 BDS |
390 | * If IP forwarding is disabled, ip_route_input() will fail, while |
391 | * ip_route_output_key() can return success. The source | |
392 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
1da177e4 | 393 | * thinks we're handling a locally generated packet and won't care |
ea2d9b41 BDS |
394 | * if IP forwarding is enabled. If the output device equals the logical bridge |
395 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
396 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
397 | */ | |
1da177e4 LT |
398 | static int br_nf_pre_routing_finish(struct sk_buff *skb) |
399 | { | |
400 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 401 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 402 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
511c3f92 | 403 | struct rtable *rt; |
f216f082 | 404 | int err; |
1da177e4 | 405 | |
1da177e4 LT |
406 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
407 | skb->pkt_type = PACKET_OTHERHOST; | |
408 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
409 | } | |
410 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 411 | if (dnat_took_place(skb)) { |
f216f082 | 412 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
f3abc9b9 | 413 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
f216f082 BDS |
414 | |
415 | /* If err equals -EHOSTUNREACH the error is due to a | |
416 | * martian destination or due to the fact that | |
417 | * forwarding is disabled. For most martian packets, | |
418 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
419 | * martian destinations: loopback destinations and destination | |
420 | * 0.0.0.0. In both cases the packet will be dropped because the | |
421 | * destination is the loopback device and not the bridge. */ | |
422 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
423 | goto free_skb; | |
1da177e4 | 424 | |
78fbfd8a DM |
425 | rt = ip_route_output(dev_net(dev), iph->daddr, 0, |
426 | RT_TOS(iph->tos), 0); | |
b23dd4fe | 427 | if (!IS_ERR(rt)) { |
1c011bed | 428 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 | 429 | * require ip_forwarding. */ |
b23dd4fe DM |
430 | if (rt->dst.dev == dev) { |
431 | skb_dst_set(skb, &rt->dst); | |
1da177e4 LT |
432 | goto bridged_dnat; |
433 | } | |
b23dd4fe | 434 | ip_rt_put(rt); |
1da177e4 | 435 | } |
f216f082 | 436 | free_skb: |
1da177e4 LT |
437 | kfree_skb(skb); |
438 | return 0; | |
439 | } else { | |
adf30907 | 440 | if (skb_dst(skb)->dev == dev) { |
1da177e4 | 441 | bridged_dnat: |
1da177e4 | 442 | skb->dev = nf_bridge->physindev; |
e179e632 | 443 | nf_bridge_update_protocol(skb); |
fc38582d | 444 | nf_bridge_push_encap_header(skb); |
713aefa3 JE |
445 | NF_HOOK_THRESH(NFPROTO_BRIDGE, |
446 | NF_BR_PRE_ROUTING, | |
1da177e4 LT |
447 | skb, skb->dev, NULL, |
448 | br_nf_pre_routing_finish_bridge, | |
449 | 1); | |
450 | return 0; | |
451 | } | |
789bc3e5 | 452 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
453 | skb->pkt_type = PACKET_HOST; |
454 | } | |
455 | } else { | |
511c3f92 ED |
456 | rt = bridge_parent_rtable(nf_bridge->physindev); |
457 | if (!rt) { | |
4adf0af6 SW |
458 | kfree_skb(skb); |
459 | return 0; | |
460 | } | |
f9181f4f | 461 | skb_dst_set_noref(skb, &rt->dst); |
1da177e4 LT |
462 | } |
463 | ||
464 | skb->dev = nf_bridge->physindev; | |
e179e632 | 465 | nf_bridge_update_protocol(skb); |
fc38582d | 466 | nf_bridge_push_encap_header(skb); |
713aefa3 | 467 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
468 | br_handle_frame_finish, 1); |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 474 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
475 | { |
476 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
477 | ||
478 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
479 | skb->pkt_type = PACKET_HOST; | |
480 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
481 | } | |
482 | ||
483 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
484 | nf_bridge->physindev = skb->dev; | |
485 | skb->dev = bridge_parent(skb->dev); | |
e179e632 BDS |
486 | if (skb->protocol == htons(ETH_P_8021Q)) |
487 | nf_bridge->mask |= BRNF_8021Q; | |
488 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
489 | nf_bridge->mask |= BRNF_PPPoE; | |
5dce971a SH |
490 | |
491 | return skb->dev; | |
1da177e4 LT |
492 | } |
493 | ||
494 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
495 | static int check_hbh_len(struct sk_buff *skb) | |
496 | { | |
0660e03f | 497 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 498 | u32 pkt_len; |
d56f90a7 ACM |
499 | const unsigned char *nh = skb_network_header(skb); |
500 | int off = raw - nh; | |
789bc3e5 | 501 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
502 | |
503 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
504 | goto bad; | |
505 | ||
506 | off += 2; | |
507 | len -= 2; | |
508 | ||
509 | while (len > 0) { | |
d56f90a7 | 510 | int optlen = nh[off + 1] + 2; |
1da177e4 | 511 | |
d56f90a7 | 512 | switch (nh[off]) { |
1da177e4 LT |
513 | case IPV6_TLV_PAD0: |
514 | optlen = 1; | |
515 | break; | |
516 | ||
517 | case IPV6_TLV_PADN: | |
518 | break; | |
519 | ||
520 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 521 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 522 | goto bad; |
d56f90a7 | 523 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 524 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 525 | ipv6_hdr(skb)->payload_len) |
b0366486 | 526 | goto bad; |
1da177e4 LT |
527 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
528 | goto bad; | |
b0366486 | 529 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 530 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 531 | goto bad; |
d56f90a7 | 532 | nh = skb_network_header(skb); |
1da177e4 LT |
533 | break; |
534 | default: | |
535 | if (optlen > len) | |
536 | goto bad; | |
537 | break; | |
538 | } | |
539 | off += optlen; | |
540 | len -= optlen; | |
541 | } | |
542 | if (len == 0) | |
543 | return 0; | |
544 | bad: | |
545 | return -1; | |
546 | ||
547 | } | |
548 | ||
549 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
550 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
551 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
552 | struct sk_buff *skb, |
553 | const struct net_device *in, | |
554 | const struct net_device *out, | |
555 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
556 | { |
557 | struct ipv6hdr *hdr; | |
558 | u32 pkt_len; | |
1da177e4 LT |
559 | |
560 | if (skb->len < sizeof(struct ipv6hdr)) | |
deef4b52 | 561 | return NF_DROP; |
1da177e4 LT |
562 | |
563 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
deef4b52 | 564 | return NF_DROP; |
1da177e4 | 565 | |
0660e03f | 566 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
567 | |
568 | if (hdr->version != 6) | |
deef4b52 | 569 | return NF_DROP; |
1da177e4 LT |
570 | |
571 | pkt_len = ntohs(hdr->payload_len); | |
572 | ||
573 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
574 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
deef4b52 | 575 | return NF_DROP; |
b38dfee3 | 576 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
deef4b52 | 577 | return NF_DROP; |
1da177e4 LT |
578 | } |
579 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
deef4b52 | 580 | return NF_DROP; |
1da177e4 | 581 | |
789bc3e5 | 582 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 583 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 584 | return NF_DROP; |
5dce971a SH |
585 | if (!setup_pre_routing(skb)) |
586 | return NF_DROP; | |
1da177e4 | 587 | |
e179e632 | 588 | skb->protocol = htons(ETH_P_IPV6); |
713aefa3 | 589 | NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
590 | br_nf_pre_routing_finish_ipv6); |
591 | ||
592 | return NF_STOLEN; | |
1da177e4 LT |
593 | } |
594 | ||
595 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
596 | * Replicate the checks that IPv4 does on packet reception. | |
597 | * Set skb->dev to the bridge device (i.e. parent of the | |
598 | * receiving device) to make netfilter happy, the REDIRECT | |
599 | * target in particular. Save the original destination IP | |
600 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 601 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
602 | const struct net_device *in, |
603 | const struct net_device *out, | |
604 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 605 | { |
4df53d8b PM |
606 | struct net_bridge_port *p; |
607 | struct net_bridge *br; | |
e7c243c9 EP |
608 | __u32 len = nf_bridge_encap_header_len(skb); |
609 | ||
e7c243c9 | 610 | if (unlikely(!pskb_may_pull(skb, len))) |
deef4b52 | 611 | return NF_DROP; |
1da177e4 | 612 | |
e490c1de | 613 | p = br_port_get_rcu(in); |
4df53d8b | 614 | if (p == NULL) |
deef4b52 | 615 | return NF_DROP; |
4df53d8b PM |
616 | br = p->br; |
617 | ||
516299d2 MM |
618 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
619 | IS_PPPOE_IPV6(skb)) { | |
4df53d8b | 620 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) |
1da177e4 | 621 | return NF_ACCEPT; |
4df53d8b | 622 | |
fc38582d | 623 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
624 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
625 | } | |
4df53d8b PM |
626 | |
627 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
1da177e4 | 628 | return NF_ACCEPT; |
1da177e4 | 629 | |
516299d2 MM |
630 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
631 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
632 | return NF_ACCEPT; |
633 | ||
fc38582d | 634 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 | 635 | |
462fb2af | 636 | if (br_parse_ip_options(skb)) |
deef4b52 | 637 | return NF_DROP; |
17762060 | 638 | |
789bc3e5 | 639 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 640 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 641 | return NF_DROP; |
5dce971a SH |
642 | if (!setup_pre_routing(skb)) |
643 | return NF_DROP; | |
1da177e4 | 644 | store_orig_dstaddr(skb); |
e179e632 | 645 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 646 | |
713aefa3 | 647 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
648 | br_nf_pre_routing_finish); |
649 | ||
650 | return NF_STOLEN; | |
1da177e4 LT |
651 | } |
652 | ||
653 | ||
654 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
655 | /* The packet is locally destined, which requires a real | |
656 | * dst_entry, so detach the fake one. On the way up, the | |
657 | * packet would pass through PRE_ROUTING again (which already | |
658 | * took place when the packet entered the bridge), but we | |
659 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
660 | * prevent this from happening. */ | |
3db05fea | 661 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
662 | const struct net_device *in, |
663 | const struct net_device *out, | |
664 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 665 | { |
511c3f92 ED |
666 | struct rtable *rt = skb_rtable(skb); |
667 | ||
adf30907 ED |
668 | if (rt && rt == bridge_parent_rtable(in)) |
669 | skb_dst_drop(skb); | |
1da177e4 LT |
670 | |
671 | return NF_ACCEPT; | |
672 | } | |
673 | ||
1da177e4 LT |
674 | /* PF_BRIDGE/FORWARD *************************************************/ |
675 | static int br_nf_forward_finish(struct sk_buff *skb) | |
676 | { | |
677 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
678 | struct net_device *in; | |
1da177e4 | 679 | |
8b42ec39 | 680 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
681 | in = nf_bridge->physindev; |
682 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
683 | skb->pkt_type = PACKET_OTHERHOST; | |
684 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
685 | } | |
e94c6743 | 686 | nf_bridge_update_protocol(skb); |
1da177e4 LT |
687 | } else { |
688 | in = *((struct net_device **)(skb->cb)); | |
689 | } | |
fc38582d | 690 | nf_bridge_push_encap_header(skb); |
e179e632 | 691 | |
713aefa3 | 692 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 693 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
694 | return 0; |
695 | } | |
696 | ||
697 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
698 | * netfilter with indev and outdev set to the bridge device, | |
699 | * but we are still able to filter on the 'real' indev/outdev | |
700 | * because of the physdev module. For ARP, indev and outdev are the | |
701 | * bridge ports. */ | |
3db05fea | 702 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
703 | const struct net_device *in, |
704 | const struct net_device *out, | |
705 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 706 | { |
1da177e4 | 707 | struct nf_bridge_info *nf_bridge; |
5dce971a | 708 | struct net_device *parent; |
76108cea | 709 | u_int8_t pf; |
1da177e4 LT |
710 | |
711 | if (!skb->nf_bridge) | |
712 | return NF_ACCEPT; | |
713 | ||
2dc2f207 PM |
714 | /* Need exclusive nf_bridge_info since we might have multiple |
715 | * different physoutdevs. */ | |
716 | if (!nf_bridge_unshare(skb)) | |
717 | return NF_DROP; | |
718 | ||
5dce971a SH |
719 | parent = bridge_parent(out); |
720 | if (!parent) | |
721 | return NF_DROP; | |
722 | ||
516299d2 MM |
723 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
724 | IS_PPPOE_IP(skb)) | |
1da177e4 | 725 | pf = PF_INET; |
a2bd40ad HX |
726 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
727 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 728 | pf = PF_INET6; |
a2bd40ad HX |
729 | else |
730 | return NF_ACCEPT; | |
1da177e4 | 731 | |
3db05fea | 732 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 733 | |
1da177e4 LT |
734 | nf_bridge = skb->nf_bridge; |
735 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
736 | skb->pkt_type = PACKET_HOST; | |
737 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
738 | } | |
739 | ||
6b1e960f HX |
740 | if (br_parse_ip_options(skb)) |
741 | return NF_DROP; | |
742 | ||
1da177e4 LT |
743 | /* The physdev module checks on this */ |
744 | nf_bridge->mask |= BRNF_BRIDGED; | |
745 | nf_bridge->physoutdev = skb->dev; | |
e179e632 BDS |
746 | if (pf == PF_INET) |
747 | skb->protocol = htons(ETH_P_IP); | |
748 | else | |
749 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 750 | |
6e23ae2a | 751 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 752 | br_nf_forward_finish); |
1da177e4 LT |
753 | |
754 | return NF_STOLEN; | |
755 | } | |
756 | ||
3db05fea | 757 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
758 | const struct net_device *in, |
759 | const struct net_device *out, | |
760 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 761 | { |
4df53d8b PM |
762 | struct net_bridge_port *p; |
763 | struct net_bridge *br; | |
1da177e4 LT |
764 | struct net_device **d = (struct net_device **)(skb->cb); |
765 | ||
e490c1de | 766 | p = br_port_get_rcu(out); |
4df53d8b PM |
767 | if (p == NULL) |
768 | return NF_ACCEPT; | |
769 | br = p->br; | |
770 | ||
771 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
1da177e4 | 772 | return NF_ACCEPT; |
1da177e4 | 773 | |
f8a26028 | 774 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 775 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 776 | return NF_ACCEPT; |
3db05fea | 777 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
778 | } |
779 | ||
d0a92be0 | 780 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 781 | if (IS_VLAN_ARP(skb)) |
3db05fea | 782 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
783 | return NF_ACCEPT; |
784 | } | |
785 | *d = (struct net_device *)in; | |
fdc9314c | 786 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
787 | (struct net_device *)out, br_nf_forward_finish); |
788 | ||
789 | return NF_STOLEN; | |
790 | } | |
791 | ||
c197facc | 792 | #if defined(CONFIG_NF_CONNTRACK_IPV4) || defined(CONFIG_NF_CONNTRACK_IPV4_MODULE) |
2e2f7aef PM |
793 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
794 | { | |
462fb2af BD |
795 | int ret; |
796 | ||
e179e632 | 797 | if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) && |
6c79bf0f | 798 | skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu && |
87f94b4e | 799 | !skb_is_gso(skb)) { |
462fb2af BD |
800 | if (br_parse_ip_options(skb)) |
801 | /* Drop invalid packet */ | |
802 | return NF_DROP; | |
803 | ret = ip_fragment(skb, br_dev_queue_push_xmit); | |
87f94b4e | 804 | } else |
462fb2af BD |
805 | ret = br_dev_queue_push_xmit(skb); |
806 | ||
807 | return ret; | |
2e2f7aef | 808 | } |
c197facc | 809 | #else |
810 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) | |
811 | { | |
812 | return br_dev_queue_push_xmit(skb); | |
813 | } | |
814 | #endif | |
1da177e4 LT |
815 | |
816 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 817 | static unsigned int br_nf_post_routing(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 | { |
3db05fea | 822 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 823 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 824 | u_int8_t pf; |
1da177e4 | 825 | |
ea2d9b41 | 826 | if (!nf_bridge || !(nf_bridge->mask & BRNF_BRIDGED)) |
81d9ddae PM |
827 | return NF_ACCEPT; |
828 | ||
5dce971a SH |
829 | if (!realoutdev) |
830 | return NF_DROP; | |
831 | ||
516299d2 MM |
832 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
833 | IS_PPPOE_IP(skb)) | |
1da177e4 | 834 | pf = PF_INET; |
a2bd40ad HX |
835 | else if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
836 | IS_PPPOE_IPV6(skb)) | |
1da177e4 | 837 | pf = PF_INET6; |
a2bd40ad HX |
838 | else |
839 | return NF_ACCEPT; | |
1da177e4 | 840 | |
1da177e4 LT |
841 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care |
842 | * about the value of skb->pkt_type. */ | |
843 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
844 | skb->pkt_type = PACKET_HOST; | |
845 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
846 | } | |
847 | ||
fc38582d | 848 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 849 | nf_bridge_save_header(skb); |
e179e632 BDS |
850 | if (pf == PF_INET) |
851 | skb->protocol = htons(ETH_P_IP); | |
852 | else | |
853 | skb->protocol = htons(ETH_P_IPV6); | |
1da177e4 | 854 | |
6e23ae2a | 855 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 856 | br_nf_dev_queue_xmit); |
1da177e4 LT |
857 | |
858 | return NF_STOLEN; | |
1da177e4 LT |
859 | } |
860 | ||
1da177e4 LT |
861 | /* IP/SABOTAGE *****************************************************/ |
862 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
863 | * for the second time. */ | |
3db05fea | 864 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
865 | const struct net_device *in, |
866 | const struct net_device *out, | |
867 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 868 | { |
3db05fea HX |
869 | if (skb->nf_bridge && |
870 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
871 | return NF_STOP; |
872 | } | |
873 | ||
874 | return NF_ACCEPT; | |
875 | } | |
876 | ||
ea2d9b41 BDS |
877 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because |
878 | * br_dev_queue_push_xmit is called afterwards */ | |
1999414a | 879 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
1490fd89 CG |
880 | { |
881 | .hook = br_nf_pre_routing, | |
882 | .owner = THIS_MODULE, | |
883 | .pf = PF_BRIDGE, | |
884 | .hooknum = NF_BR_PRE_ROUTING, | |
885 | .priority = NF_BR_PRI_BRNF, | |
886 | }, | |
887 | { | |
888 | .hook = br_nf_local_in, | |
889 | .owner = THIS_MODULE, | |
890 | .pf = PF_BRIDGE, | |
891 | .hooknum = NF_BR_LOCAL_IN, | |
892 | .priority = NF_BR_PRI_BRNF, | |
893 | }, | |
894 | { | |
895 | .hook = br_nf_forward_ip, | |
896 | .owner = THIS_MODULE, | |
897 | .pf = PF_BRIDGE, | |
898 | .hooknum = NF_BR_FORWARD, | |
899 | .priority = NF_BR_PRI_BRNF - 1, | |
900 | }, | |
901 | { | |
902 | .hook = br_nf_forward_arp, | |
903 | .owner = THIS_MODULE, | |
904 | .pf = PF_BRIDGE, | |
905 | .hooknum = NF_BR_FORWARD, | |
906 | .priority = NF_BR_PRI_BRNF, | |
907 | }, | |
1490fd89 CG |
908 | { |
909 | .hook = br_nf_post_routing, | |
910 | .owner = THIS_MODULE, | |
911 | .pf = PF_BRIDGE, | |
912 | .hooknum = NF_BR_POST_ROUTING, | |
913 | .priority = NF_BR_PRI_LAST, | |
914 | }, | |
915 | { | |
916 | .hook = ip_sabotage_in, | |
917 | .owner = THIS_MODULE, | |
918 | .pf = PF_INET, | |
919 | .hooknum = NF_INET_PRE_ROUTING, | |
920 | .priority = NF_IP_PRI_FIRST, | |
921 | }, | |
922 | { | |
923 | .hook = ip_sabotage_in, | |
924 | .owner = THIS_MODULE, | |
925 | .pf = PF_INET6, | |
926 | .hooknum = NF_INET_PRE_ROUTING, | |
927 | .priority = NF_IP6_PRI_FIRST, | |
928 | }, | |
1da177e4 LT |
929 | }; |
930 | ||
931 | #ifdef CONFIG_SYSCTL | |
932 | static | |
8d65af78 | 933 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, |
789bc3e5 | 934 | void __user * buffer, size_t * lenp, loff_t * ppos) |
1da177e4 LT |
935 | { |
936 | int ret; | |
937 | ||
8d65af78 | 938 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
1da177e4 LT |
939 | |
940 | if (write && *(int *)(ctl->data)) | |
941 | *(int *)(ctl->data) = 1; | |
942 | return ret; | |
943 | } | |
944 | ||
945 | static ctl_table brnf_table[] = { | |
946 | { | |
1da177e4 LT |
947 | .procname = "bridge-nf-call-arptables", |
948 | .data = &brnf_call_arptables, | |
949 | .maxlen = sizeof(int), | |
950 | .mode = 0644, | |
6d9f239a | 951 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
952 | }, |
953 | { | |
1da177e4 LT |
954 | .procname = "bridge-nf-call-iptables", |
955 | .data = &brnf_call_iptables, | |
956 | .maxlen = sizeof(int), | |
957 | .mode = 0644, | |
6d9f239a | 958 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
959 | }, |
960 | { | |
1da177e4 LT |
961 | .procname = "bridge-nf-call-ip6tables", |
962 | .data = &brnf_call_ip6tables, | |
963 | .maxlen = sizeof(int), | |
964 | .mode = 0644, | |
6d9f239a | 965 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 LT |
966 | }, |
967 | { | |
1da177e4 LT |
968 | .procname = "bridge-nf-filter-vlan-tagged", |
969 | .data = &brnf_filter_vlan_tagged, | |
970 | .maxlen = sizeof(int), | |
971 | .mode = 0644, | |
6d9f239a | 972 | .proc_handler = brnf_sysctl_call_tables, |
516299d2 MM |
973 | }, |
974 | { | |
516299d2 MM |
975 | .procname = "bridge-nf-filter-pppoe-tagged", |
976 | .data = &brnf_filter_pppoe_tagged, | |
977 | .maxlen = sizeof(int), | |
978 | .mode = 0644, | |
6d9f239a | 979 | .proc_handler = brnf_sysctl_call_tables, |
1da177e4 | 980 | }, |
f8572d8f | 981 | { } |
1da177e4 LT |
982 | }; |
983 | ||
b5ccd792 | 984 | static struct ctl_path brnf_path[] = { |
f8572d8f EB |
985 | { .procname = "net", }, |
986 | { .procname = "bridge", }, | |
b5ccd792 | 987 | { } |
1da177e4 LT |
988 | }; |
989 | #endif | |
990 | ||
5eb87f45 | 991 | int __init br_netfilter_init(void) |
1da177e4 | 992 | { |
5eb87f45 | 993 | int ret; |
1da177e4 | 994 | |
fc66f95c | 995 | ret = dst_entries_init(&fake_dst_ops); |
5eb87f45 | 996 | if (ret < 0) |
1da177e4 | 997 | return ret; |
fc66f95c ED |
998 | |
999 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
1000 | if (ret < 0) { | |
1001 | dst_entries_destroy(&fake_dst_ops); | |
1002 | return ret; | |
1003 | } | |
1da177e4 | 1004 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 1005 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 1006 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1007 | printk(KERN_WARNING |
1008 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 | 1009 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
fc66f95c | 1010 | dst_entries_destroy(&fake_dst_ops); |
5eb87f45 | 1011 | return -ENOMEM; |
1da177e4 LT |
1012 | } |
1013 | #endif | |
1da177e4 | 1014 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1015 | return 0; |
1016 | } | |
1017 | ||
1018 | void br_netfilter_fini(void) | |
1019 | { | |
5eb87f45 | 1020 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
1021 | #ifdef CONFIG_SYSCTL |
1022 | unregister_sysctl_table(brnf_sysctl_header); | |
1023 | #endif | |
fc66f95c | 1024 | dst_entries_destroy(&fake_dst_ops); |
1da177e4 | 1025 | } |