Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * Bart De Schuymer (maintainer) <bdschuym@pandora.be> | |
8 | * | |
9 | * Changes: | |
10 | * Apr 29 2003: physdev module support (bdschuym) | |
11 | * Jun 19 2003: let arptables see bridged ARP traffic (bdschuym) | |
12 | * Oct 06 2003: filter encapsulated IP/ARP VLAN traffic on untagged bridge | |
13 | * (bdschuym) | |
14 | * Sep 01 2004: add IPv6 filtering (bdschuym) | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | * | |
21 | * Lennert dedicates this file to Kerstin Wurdinger. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/ip.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/skbuff.h> | |
14c85021 | 29 | #include <linux/if_arp.h> |
1da177e4 LT |
30 | #include <linux/if_ether.h> |
31 | #include <linux/if_vlan.h> | |
516299d2 MM |
32 | #include <linux/if_pppox.h> |
33 | #include <linux/ppp_defs.h> | |
1da177e4 LT |
34 | #include <linux/netfilter_bridge.h> |
35 | #include <linux/netfilter_ipv4.h> | |
36 | #include <linux/netfilter_ipv6.h> | |
37 | #include <linux/netfilter_arp.h> | |
38 | #include <linux/in_route.h> | |
f216f082 | 39 | #include <linux/inetdevice.h> |
14c85021 | 40 | |
1da177e4 LT |
41 | #include <net/ip.h> |
42 | #include <net/ipv6.h> | |
14c85021 ACM |
43 | #include <net/route.h> |
44 | ||
1da177e4 | 45 | #include <asm/uaccess.h> |
1da177e4 LT |
46 | #include "br_private.h" |
47 | #ifdef CONFIG_SYSCTL | |
48 | #include <linux/sysctl.h> | |
49 | #endif | |
50 | ||
51 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
52 | (skb->nf_bridge->data))->daddr.ipv4) | |
eddc9ec5 ACM |
53 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = ip_hdr(skb)->daddr) |
54 | #define dnat_took_place(skb) (skb_origaddr(skb) != ip_hdr(skb)->daddr) | |
1da177e4 | 55 | |
1da177e4 LT |
56 | #ifdef CONFIG_SYSCTL |
57 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
58 | static int brnf_call_iptables __read_mostly = 1; |
59 | static int brnf_call_ip6tables __read_mostly = 1; | |
60 | static int brnf_call_arptables __read_mostly = 1; | |
61 | static int brnf_filter_vlan_tagged __read_mostly = 1; | |
516299d2 | 62 | static int brnf_filter_pppoe_tagged __read_mostly = 1; |
1da177e4 LT |
63 | #else |
64 | #define brnf_filter_vlan_tagged 1 | |
516299d2 | 65 | #define brnf_filter_pppoe_tagged 1 |
1da177e4 LT |
66 | #endif |
67 | ||
b6f99a21 | 68 | static inline __be16 vlan_proto(const struct sk_buff *skb) |
8b42ec39 SH |
69 | { |
70 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
71 | } | |
72 | ||
73 | #define IS_VLAN_IP(skb) \ | |
74 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
9d6f229f | 75 | vlan_proto(skb) == htons(ETH_P_IP) && \ |
8b42ec39 SH |
76 | brnf_filter_vlan_tagged) |
77 | ||
78 | #define IS_VLAN_IPV6(skb) \ | |
79 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
80 | vlan_proto(skb) == htons(ETH_P_IPV6) &&\ | |
81 | brnf_filter_vlan_tagged) | |
82 | ||
83 | #define IS_VLAN_ARP(skb) \ | |
84 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
85 | vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
86 | brnf_filter_vlan_tagged) | |
1da177e4 | 87 | |
516299d2 MM |
88 | static inline __be16 pppoe_proto(const struct sk_buff *skb) |
89 | { | |
90 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
91 | sizeof(struct pppoe_hdr))); | |
92 | } | |
93 | ||
94 | #define IS_PPPOE_IP(skb) \ | |
95 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
96 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
97 | brnf_filter_pppoe_tagged) | |
98 | ||
99 | #define IS_PPPOE_IPV6(skb) \ | |
100 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
101 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
102 | brnf_filter_pppoe_tagged) | |
103 | ||
631339f1 HX |
104 | static void fake_update_pmtu(struct dst_entry *dst, u32 mtu) |
105 | { | |
106 | } | |
107 | ||
108 | static struct dst_ops fake_dst_ops = { | |
109 | .family = AF_INET, | |
110 | .protocol = __constant_htons(ETH_P_IP), | |
111 | .update_pmtu = fake_update_pmtu, | |
112 | .entry_size = sizeof(struct rtable), | |
113 | .entries = ATOMIC_INIT(0), | |
114 | }; | |
115 | ||
4adf0af6 SW |
116 | /* |
117 | * Initialize bogus route table used to keep netfilter happy. | |
1da177e4 LT |
118 | * Currently, we fill in the PMTU entry because netfilter |
119 | * refragmentation needs it, and the rt_flags entry because | |
120 | * ipt_REJECT needs it. Future netfilter modules might | |
4adf0af6 SW |
121 | * require us to fill additional fields. |
122 | */ | |
123 | void br_netfilter_rtable_init(struct net_bridge *br) | |
124 | { | |
125 | struct rtable *rt = &br->fake_rtable; | |
126 | ||
127 | atomic_set(&rt->u.dst.__refcnt, 1); | |
ad619800 | 128 | rt->u.dst.dev = br->dev; |
4adf0af6 SW |
129 | rt->u.dst.path = &rt->u.dst; |
130 | rt->u.dst.metrics[RTAX_MTU - 1] = 1500; | |
131 | rt->u.dst.flags = DST_NOXFRM; | |
631339f1 | 132 | rt->u.dst.ops = &fake_dst_ops; |
4adf0af6 SW |
133 | } |
134 | ||
135 | static inline struct rtable *bridge_parent_rtable(const struct net_device *dev) | |
136 | { | |
137 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
138 | ||
139 | return port ? &port->br->fake_rtable : NULL; | |
140 | } | |
1da177e4 | 141 | |
5dce971a SH |
142 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
143 | { | |
144 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
145 | ||
146 | return port ? port->br->dev : NULL; | |
147 | } | |
1da177e4 | 148 | |
fdeabdef SH |
149 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
150 | { | |
151 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
152 | if (likely(skb->nf_bridge)) | |
153 | atomic_set(&(skb->nf_bridge->use), 1); | |
154 | ||
155 | return skb->nf_bridge; | |
156 | } | |
157 | ||
2dc2f207 PM |
158 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) |
159 | { | |
160 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
161 | ||
162 | if (atomic_read(&nf_bridge->use) > 1) { | |
163 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
164 | ||
165 | if (tmp) { | |
166 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
167 | atomic_set(&tmp->use, 1); | |
168 | nf_bridge_put(nf_bridge); | |
169 | } | |
170 | nf_bridge = tmp; | |
171 | } | |
172 | return nf_bridge; | |
173 | } | |
174 | ||
fc38582d PM |
175 | static inline void nf_bridge_push_encap_header(struct sk_buff *skb) |
176 | { | |
177 | unsigned int len = nf_bridge_encap_header_len(skb); | |
178 | ||
179 | skb_push(skb, len); | |
180 | skb->network_header -= len; | |
181 | } | |
182 | ||
183 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
fdeabdef | 184 | { |
fc38582d PM |
185 | unsigned int len = nf_bridge_encap_header_len(skb); |
186 | ||
187 | skb_pull(skb, len); | |
188 | skb->network_header += len; | |
189 | } | |
fdeabdef | 190 | |
fc38582d PM |
191 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) |
192 | { | |
193 | unsigned int len = nf_bridge_encap_header_len(skb); | |
194 | ||
195 | skb_pull_rcsum(skb, len); | |
196 | skb->network_header += len; | |
197 | } | |
198 | ||
199 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
200 | { | |
201 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); | |
fdeabdef | 202 | |
d626f62b ACM |
203 | skb_copy_from_linear_data_offset(skb, -header_size, |
204 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
205 | } |
206 | ||
07317621 SH |
207 | /* |
208 | * When forwarding bridge frames, we save a copy of the original | |
209 | * header before processing. | |
210 | */ | |
211 | int nf_bridge_copy_header(struct sk_buff *skb) | |
212 | { | |
213 | int err; | |
fc38582d | 214 | int header_size = ETH_HLEN + nf_bridge_encap_header_len(skb); |
07317621 | 215 | |
d9cc2048 | 216 | err = skb_cow_head(skb, header_size); |
07317621 SH |
217 | if (err) |
218 | return err; | |
219 | ||
27d7ff46 ACM |
220 | skb_copy_to_linear_data_offset(skb, -header_size, |
221 | skb->nf_bridge->data, header_size); | |
fc38582d | 222 | __skb_push(skb, nf_bridge_encap_header_len(skb)); |
07317621 SH |
223 | return 0; |
224 | } | |
225 | ||
1da177e4 LT |
226 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
227 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
228 | * bridge PRE_ROUTING hook. */ | |
229 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
230 | { | |
231 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
232 | ||
1da177e4 LT |
233 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
234 | skb->pkt_type = PACKET_OTHERHOST; | |
235 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
236 | } | |
237 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
238 | ||
4adf0af6 SW |
239 | skb->rtable = bridge_parent_rtable(nf_bridge->physindev); |
240 | if (!skb->rtable) { | |
241 | kfree_skb(skb); | |
242 | return 0; | |
243 | } | |
244 | dst_hold(&skb->rtable->u.dst); | |
1da177e4 LT |
245 | |
246 | skb->dev = nf_bridge->physindev; | |
fc38582d | 247 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
248 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
249 | br_handle_frame_finish, 1); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static void __br_dnat_complain(void) | |
255 | { | |
256 | static unsigned long last_complaint; | |
257 | ||
258 | if (jiffies - last_complaint >= 5 * HZ) { | |
259 | printk(KERN_WARNING "Performing cross-bridge DNAT requires IP " | |
789bc3e5 | 260 | "forwarding to be enabled\n"); |
1da177e4 LT |
261 | last_complaint = jiffies; |
262 | } | |
263 | } | |
264 | ||
265 | /* This requires some explaining. If DNAT has taken place, | |
266 | * we will need to fix up the destination Ethernet address, | |
267 | * and this is a tricky process. | |
268 | * | |
269 | * There are two cases to consider: | |
270 | * 1. The packet was DNAT'ed to a device in the same bridge | |
271 | * port group as it was received on. We can still bridge | |
272 | * the packet. | |
273 | * 2. The packet was DNAT'ed to a different device, either | |
274 | * a non-bridged device or another bridge port group. | |
275 | * The packet will need to be routed. | |
276 | * | |
277 | * The correct way of distinguishing between these two cases is to | |
278 | * call ip_route_input() and to look at skb->dst->dev, which is | |
279 | * changed to the destination device if ip_route_input() succeeds. | |
280 | * | |
281 | * Let us first consider the case that ip_route_input() succeeds: | |
282 | * | |
283 | * If skb->dst->dev equals the logical bridge device the packet | |
2948d2eb PM |
284 | * came in on, we can consider this bridging. The packet is passed |
285 | * through the neighbour output function to build a new destination | |
286 | * MAC address, which will make the packet enter br_nf_local_out() | |
1da177e4 LT |
287 | * not much later. In that function it is assured that the iptables |
288 | * FORWARD chain is traversed for the packet. | |
289 | * | |
290 | * Otherwise, the packet is considered to be routed and we just | |
291 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
292 | * later be passed up to the IP stack to be routed. For a redirected |
293 | * packet, ip_route_input() will give back the localhost as output device, | |
294 | * which differs from the bridge device. | |
1da177e4 LT |
295 | * |
296 | * Let us now consider the case that ip_route_input() fails: | |
297 | * | |
f216f082 BDS |
298 | * This can be because the destination address is martian, in which case |
299 | * the packet will be dropped. | |
1da177e4 LT |
300 | * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input() |
301 | * will fail, while __ip_route_output_key() will return success. The source | |
302 | * address for __ip_route_output_key() is set to zero, so __ip_route_output_key | |
303 | * thinks we're handling a locally generated packet and won't care | |
304 | * if IP forwarding is allowed. We send a warning message to the users's | |
305 | * log telling her to put IP forwarding on. | |
306 | * | |
307 | * ip_route_input() will also fail if there is no route available. | |
308 | * In that case we just drop the packet. | |
309 | * | |
310 | * --Lennert, 20020411 | |
311 | * --Bart, 20020416 (updated) | |
f216f082 BDS |
312 | * --Bart, 20021007 (updated) |
313 | * --Bart, 20062711 (updated) */ | |
1da177e4 LT |
314 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
315 | { | |
1da177e4 LT |
316 | if (skb->pkt_type == PACKET_OTHERHOST) { |
317 | skb->pkt_type = PACKET_HOST; | |
318 | skb->nf_bridge->mask |= BRNF_PKT_TYPE; | |
319 | } | |
320 | skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
321 | ||
322 | skb->dev = bridge_parent(skb->dev); | |
2948d2eb PM |
323 | if (skb->dev) { |
324 | struct dst_entry *dst = skb->dst; | |
325 | ||
fc38582d | 326 | nf_bridge_pull_encap_header(skb); |
2948d2eb PM |
327 | |
328 | if (dst->hh) | |
329 | return neigh_hh_output(dst->hh, skb); | |
330 | else if (dst->neighbour) | |
331 | return dst->neighbour->output(skb); | |
1da177e4 | 332 | } |
2948d2eb | 333 | kfree_skb(skb); |
1da177e4 LT |
334 | return 0; |
335 | } | |
336 | ||
337 | static int br_nf_pre_routing_finish(struct sk_buff *skb) | |
338 | { | |
339 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 340 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 341 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
f216f082 | 342 | int err; |
1da177e4 | 343 | |
1da177e4 LT |
344 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
345 | skb->pkt_type = PACKET_OTHERHOST; | |
346 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
347 | } | |
348 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
1da177e4 | 349 | if (dnat_took_place(skb)) { |
f216f082 | 350 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
1da177e4 | 351 | struct rtable *rt; |
789bc3e5 SH |
352 | struct flowi fl = { |
353 | .nl_u = { | |
354 | .ip4_u = { | |
355 | .daddr = iph->daddr, | |
356 | .saddr = 0, | |
357 | .tos = RT_TOS(iph->tos) }, | |
358 | }, | |
359 | .proto = 0, | |
360 | }; | |
f216f082 BDS |
361 | struct in_device *in_dev = in_dev_get(dev); |
362 | ||
363 | /* If err equals -EHOSTUNREACH the error is due to a | |
364 | * martian destination or due to the fact that | |
365 | * forwarding is disabled. For most martian packets, | |
366 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
367 | * martian destinations: loopback destinations and destination | |
368 | * 0.0.0.0. In both cases the packet will be dropped because the | |
369 | * destination is the loopback device and not the bridge. */ | |
370 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
371 | goto free_skb; | |
1da177e4 | 372 | |
f206351a | 373 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
1c011bed | 374 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
375 | * require ip_forwarding. */ |
376 | if (((struct dst_entry *)rt)->dev == dev) { | |
1da177e4 LT |
377 | skb->dst = (struct dst_entry *)rt; |
378 | goto bridged_dnat; | |
379 | } | |
f216f082 BDS |
380 | /* we are sure that forwarding is disabled, so printing |
381 | * this message is no problem. Note that the packet could | |
382 | * still have a martian destination address, in which case | |
383 | * the packet could be dropped even if forwarding were enabled */ | |
1da177e4 LT |
384 | __br_dnat_complain(); |
385 | dst_release((struct dst_entry *)rt); | |
386 | } | |
f216f082 | 387 | free_skb: |
1da177e4 LT |
388 | kfree_skb(skb); |
389 | return 0; | |
390 | } else { | |
391 | if (skb->dst->dev == dev) { | |
392 | bridged_dnat: | |
393 | /* Tell br_nf_local_out this is a | |
394 | * bridged frame */ | |
395 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
396 | skb->dev = nf_bridge->physindev; | |
fc38582d | 397 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
398 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, |
399 | skb, skb->dev, NULL, | |
400 | br_nf_pre_routing_finish_bridge, | |
401 | 1); | |
402 | return 0; | |
403 | } | |
789bc3e5 | 404 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
405 | skb->pkt_type = PACKET_HOST; |
406 | } | |
407 | } else { | |
4adf0af6 SW |
408 | skb->rtable = bridge_parent_rtable(nf_bridge->physindev); |
409 | if (!skb->rtable) { | |
410 | kfree_skb(skb); | |
411 | return 0; | |
412 | } | |
413 | dst_hold(&skb->rtable->u.dst); | |
1da177e4 LT |
414 | } |
415 | ||
416 | skb->dev = nf_bridge->physindev; | |
fc38582d | 417 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
418 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, |
419 | br_handle_frame_finish, 1); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 425 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
426 | { |
427 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
428 | ||
429 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
430 | skb->pkt_type = PACKET_HOST; | |
431 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
432 | } | |
433 | ||
434 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
435 | nf_bridge->physindev = skb->dev; | |
436 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
437 | |
438 | return skb->dev; | |
1da177e4 LT |
439 | } |
440 | ||
441 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
442 | static int check_hbh_len(struct sk_buff *skb) | |
443 | { | |
0660e03f | 444 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 445 | u32 pkt_len; |
d56f90a7 ACM |
446 | const unsigned char *nh = skb_network_header(skb); |
447 | int off = raw - nh; | |
789bc3e5 | 448 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
449 | |
450 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
451 | goto bad; | |
452 | ||
453 | off += 2; | |
454 | len -= 2; | |
455 | ||
456 | while (len > 0) { | |
d56f90a7 | 457 | int optlen = nh[off + 1] + 2; |
1da177e4 | 458 | |
d56f90a7 | 459 | switch (nh[off]) { |
1da177e4 LT |
460 | case IPV6_TLV_PAD0: |
461 | optlen = 1; | |
462 | break; | |
463 | ||
464 | case IPV6_TLV_PADN: | |
465 | break; | |
466 | ||
467 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 468 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 469 | goto bad; |
d56f90a7 | 470 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 471 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 472 | ipv6_hdr(skb)->payload_len) |
b0366486 | 473 | goto bad; |
1da177e4 LT |
474 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
475 | goto bad; | |
b0366486 | 476 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 477 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 478 | goto bad; |
d56f90a7 | 479 | nh = skb_network_header(skb); |
1da177e4 LT |
480 | break; |
481 | default: | |
482 | if (optlen > len) | |
483 | goto bad; | |
484 | break; | |
485 | } | |
486 | off += optlen; | |
487 | len -= optlen; | |
488 | } | |
489 | if (len == 0) | |
490 | return 0; | |
491 | bad: | |
492 | return -1; | |
493 | ||
494 | } | |
495 | ||
496 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
497 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
498 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
499 | struct sk_buff *skb, |
500 | const struct net_device *in, | |
501 | const struct net_device *out, | |
502 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
503 | { |
504 | struct ipv6hdr *hdr; | |
505 | u32 pkt_len; | |
1da177e4 LT |
506 | |
507 | if (skb->len < sizeof(struct ipv6hdr)) | |
508 | goto inhdr_error; | |
509 | ||
510 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
511 | goto inhdr_error; | |
512 | ||
0660e03f | 513 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
514 | |
515 | if (hdr->version != 6) | |
516 | goto inhdr_error; | |
517 | ||
518 | pkt_len = ntohs(hdr->payload_len); | |
519 | ||
520 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
521 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
522 | goto inhdr_error; | |
b38dfee3 HX |
523 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
524 | goto inhdr_error; | |
1da177e4 LT |
525 | } |
526 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 527 | goto inhdr_error; |
1da177e4 | 528 | |
789bc3e5 | 529 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 530 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 531 | return NF_DROP; |
5dce971a SH |
532 | if (!setup_pre_routing(skb)) |
533 | return NF_DROP; | |
1da177e4 | 534 | |
6e23ae2a | 535 | NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
536 | br_nf_pre_routing_finish_ipv6); |
537 | ||
538 | return NF_STOLEN; | |
539 | ||
540 | inhdr_error: | |
541 | return NF_DROP; | |
542 | } | |
543 | ||
544 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
545 | * Replicate the checks that IPv4 does on packet reception. | |
546 | * Set skb->dev to the bridge device (i.e. parent of the | |
547 | * receiving device) to make netfilter happy, the REDIRECT | |
548 | * target in particular. Save the original destination IP | |
549 | * address to be able to detect DNAT afterwards. */ | |
3db05fea | 550 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff *skb, |
ee02b3a6 SH |
551 | const struct net_device *in, |
552 | const struct net_device *out, | |
553 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
554 | { |
555 | struct iphdr *iph; | |
e7c243c9 EP |
556 | __u32 len = nf_bridge_encap_header_len(skb); |
557 | ||
e7c243c9 EP |
558 | if (unlikely(!pskb_may_pull(skb, len))) |
559 | goto out; | |
1da177e4 | 560 | |
516299d2 MM |
561 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
562 | IS_PPPOE_IPV6(skb)) { | |
1da177e4 LT |
563 | #ifdef CONFIG_SYSCTL |
564 | if (!brnf_call_ip6tables) | |
565 | return NF_ACCEPT; | |
566 | #endif | |
fc38582d | 567 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
568 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); |
569 | } | |
570 | #ifdef CONFIG_SYSCTL | |
571 | if (!brnf_call_iptables) | |
572 | return NF_ACCEPT; | |
573 | #endif | |
574 | ||
516299d2 MM |
575 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
576 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
577 | return NF_ACCEPT; |
578 | ||
fc38582d | 579 | nf_bridge_pull_encap_header_rcsum(skb); |
1da177e4 LT |
580 | |
581 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
582 | goto inhdr_error; | |
583 | ||
eddc9ec5 | 584 | iph = ip_hdr(skb); |
1da177e4 LT |
585 | if (iph->ihl < 5 || iph->version != 4) |
586 | goto inhdr_error; | |
587 | ||
789bc3e5 | 588 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
589 | goto inhdr_error; |
590 | ||
eddc9ec5 | 591 | iph = ip_hdr(skb); |
789bc3e5 | 592 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
593 | goto inhdr_error; |
594 | ||
595 | len = ntohs(iph->tot_len); | |
789bc3e5 | 596 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
597 | goto inhdr_error; |
598 | ||
b38dfee3 | 599 | pskb_trim_rcsum(skb, len); |
1da177e4 | 600 | |
789bc3e5 | 601 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 602 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 603 | return NF_DROP; |
5dce971a SH |
604 | if (!setup_pre_routing(skb)) |
605 | return NF_DROP; | |
1da177e4 LT |
606 | store_orig_dstaddr(skb); |
607 | ||
6e23ae2a | 608 | NF_HOOK(PF_INET, NF_INET_PRE_ROUTING, skb, skb->dev, NULL, |
1da177e4 LT |
609 | br_nf_pre_routing_finish); |
610 | ||
611 | return NF_STOLEN; | |
612 | ||
613 | inhdr_error: | |
789bc3e5 | 614 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
615 | out: |
616 | return NF_DROP; | |
617 | } | |
618 | ||
619 | ||
620 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
621 | /* The packet is locally destined, which requires a real | |
622 | * dst_entry, so detach the fake one. On the way up, the | |
623 | * packet would pass through PRE_ROUTING again (which already | |
624 | * took place when the packet entered the bridge), but we | |
625 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
626 | * prevent this from happening. */ | |
3db05fea | 627 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
628 | const struct net_device *in, |
629 | const struct net_device *out, | |
630 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 631 | { |
4adf0af6 SW |
632 | if (skb->rtable && skb->rtable == bridge_parent_rtable(in)) { |
633 | dst_release(&skb->rtable->u.dst); | |
ee6b9673 | 634 | skb->rtable = NULL; |
1da177e4 LT |
635 | } |
636 | ||
637 | return NF_ACCEPT; | |
638 | } | |
639 | ||
1da177e4 LT |
640 | /* PF_BRIDGE/FORWARD *************************************************/ |
641 | static int br_nf_forward_finish(struct sk_buff *skb) | |
642 | { | |
643 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
644 | struct net_device *in; | |
1da177e4 | 645 | |
8b42ec39 | 646 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
647 | in = nf_bridge->physindev; |
648 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
649 | skb->pkt_type = PACKET_OTHERHOST; | |
650 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
651 | } | |
652 | } else { | |
653 | in = *((struct net_device **)(skb->cb)); | |
654 | } | |
fc38582d | 655 | nf_bridge_push_encap_header(skb); |
1da177e4 | 656 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, |
789bc3e5 | 657 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
658 | return 0; |
659 | } | |
660 | ||
661 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
662 | * netfilter with indev and outdev set to the bridge device, | |
663 | * but we are still able to filter on the 'real' indev/outdev | |
664 | * because of the physdev module. For ARP, indev and outdev are the | |
665 | * bridge ports. */ | |
3db05fea | 666 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
667 | const struct net_device *in, |
668 | const struct net_device *out, | |
669 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 670 | { |
1da177e4 | 671 | struct nf_bridge_info *nf_bridge; |
5dce971a | 672 | struct net_device *parent; |
76108cea | 673 | u_int8_t pf; |
1da177e4 LT |
674 | |
675 | if (!skb->nf_bridge) | |
676 | return NF_ACCEPT; | |
677 | ||
2dc2f207 PM |
678 | /* Need exclusive nf_bridge_info since we might have multiple |
679 | * different physoutdevs. */ | |
680 | if (!nf_bridge_unshare(skb)) | |
681 | return NF_DROP; | |
682 | ||
5dce971a SH |
683 | parent = bridge_parent(out); |
684 | if (!parent) | |
685 | return NF_DROP; | |
686 | ||
516299d2 MM |
687 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
688 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
689 | pf = PF_INET; |
690 | else | |
691 | pf = PF_INET6; | |
692 | ||
3db05fea | 693 | nf_bridge_pull_encap_header(skb); |
1da177e4 | 694 | |
1da177e4 LT |
695 | nf_bridge = skb->nf_bridge; |
696 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
697 | skb->pkt_type = PACKET_HOST; | |
698 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
699 | } | |
700 | ||
701 | /* The physdev module checks on this */ | |
702 | nf_bridge->mask |= BRNF_BRIDGED; | |
703 | nf_bridge->physoutdev = skb->dev; | |
704 | ||
6e23ae2a | 705 | NF_HOOK(pf, NF_INET_FORWARD, skb, bridge_parent(in), parent, |
5dce971a | 706 | br_nf_forward_finish); |
1da177e4 LT |
707 | |
708 | return NF_STOLEN; | |
709 | } | |
710 | ||
3db05fea | 711 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
712 | const struct net_device *in, |
713 | const struct net_device *out, | |
714 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 715 | { |
1da177e4 LT |
716 | struct net_device **d = (struct net_device **)(skb->cb); |
717 | ||
718 | #ifdef CONFIG_SYSCTL | |
719 | if (!brnf_call_arptables) | |
720 | return NF_ACCEPT; | |
721 | #endif | |
722 | ||
f8a26028 | 723 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 724 | if (!IS_VLAN_ARP(skb)) |
1da177e4 | 725 | return NF_ACCEPT; |
3db05fea | 726 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
727 | } |
728 | ||
d0a92be0 | 729 | if (arp_hdr(skb)->ar_pln != 4) { |
fc38582d | 730 | if (IS_VLAN_ARP(skb)) |
3db05fea | 731 | nf_bridge_push_encap_header(skb); |
1da177e4 LT |
732 | return NF_ACCEPT; |
733 | } | |
734 | *d = (struct net_device *)in; | |
fdc9314c | 735 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, |
1da177e4 LT |
736 | (struct net_device *)out, br_nf_forward_finish); |
737 | ||
738 | return NF_STOLEN; | |
739 | } | |
740 | ||
2bf540b7 PM |
741 | /* PF_BRIDGE/LOCAL_OUT *********************************************** |
742 | * | |
743 | * This function sees both locally originated IP packets and forwarded | |
1da177e4 LT |
744 | * IP packets (in both cases the destination device is a bridge |
745 | * device). It also sees bridged-and-DNAT'ed packets. | |
1da177e4 LT |
746 | * |
747 | * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged | |
748 | * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() | |
749 | * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority | |
750 | * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor | |
751 | * will be executed. | |
2bf540b7 | 752 | */ |
3db05fea | 753 | static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
754 | const struct net_device *in, |
755 | const struct net_device *out, | |
756 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 757 | { |
2bf540b7 | 758 | struct net_device *realindev; |
1da177e4 | 759 | struct nf_bridge_info *nf_bridge; |
1da177e4 LT |
760 | |
761 | if (!skb->nf_bridge) | |
762 | return NF_ACCEPT; | |
763 | ||
2dc2f207 PM |
764 | /* Need exclusive nf_bridge_info since we might have multiple |
765 | * different physoutdevs. */ | |
766 | if (!nf_bridge_unshare(skb)) | |
767 | return NF_DROP; | |
768 | ||
1da177e4 | 769 | nf_bridge = skb->nf_bridge; |
2bf540b7 PM |
770 | if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT)) |
771 | return NF_ACCEPT; | |
1da177e4 LT |
772 | |
773 | /* Bridged, take PF_BRIDGE/FORWARD. | |
774 | * (see big note in front of br_nf_pre_routing_finish) */ | |
2bf540b7 PM |
775 | nf_bridge->physoutdev = skb->dev; |
776 | realindev = nf_bridge->physindev; | |
1da177e4 | 777 | |
2bf540b7 PM |
778 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
779 | skb->pkt_type = PACKET_OTHERHOST; | |
780 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
1da177e4 | 781 | } |
fc38582d | 782 | nf_bridge_push_encap_header(skb); |
1da177e4 | 783 | |
2bf540b7 PM |
784 | NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev, |
785 | br_forward_finish); | |
1da177e4 LT |
786 | return NF_STOLEN; |
787 | } | |
788 | ||
2e2f7aef PM |
789 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
790 | { | |
791 | if (skb->protocol == htons(ETH_P_IP) && | |
792 | skb->len > skb->dev->mtu && | |
89114afd | 793 | !skb_is_gso(skb)) |
2e2f7aef PM |
794 | return ip_fragment(skb, br_dev_queue_push_xmit); |
795 | else | |
796 | return br_dev_queue_push_xmit(skb); | |
797 | } | |
1da177e4 LT |
798 | |
799 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
3db05fea | 800 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
801 | const struct net_device *in, |
802 | const struct net_device *out, | |
803 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 804 | { |
3db05fea | 805 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
1da177e4 | 806 | struct net_device *realoutdev = bridge_parent(skb->dev); |
76108cea | 807 | u_int8_t pf; |
1da177e4 LT |
808 | |
809 | #ifdef CONFIG_NETFILTER_DEBUG | |
810 | /* Be very paranoid. This probably won't happen anymore, but let's | |
811 | * keep the check just to be sure... */ | |
98e399f8 ACM |
812 | if (skb_mac_header(skb) < skb->head || |
813 | skb_mac_header(skb) + ETH_HLEN > skb->data) { | |
1da177e4 | 814 | printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " |
8394e9b2 | 815 | "bad mac.raw pointer.\n"); |
1da177e4 LT |
816 | goto print_error; |
817 | } | |
818 | #endif | |
819 | ||
820 | if (!nf_bridge) | |
821 | return NF_ACCEPT; | |
822 | ||
81d9ddae PM |
823 | if (!(nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))) |
824 | return NF_ACCEPT; | |
825 | ||
5dce971a SH |
826 | if (!realoutdev) |
827 | return NF_DROP; | |
828 | ||
516299d2 MM |
829 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
830 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
831 | pf = PF_INET; |
832 | else | |
833 | pf = PF_INET6; | |
834 | ||
835 | #ifdef CONFIG_NETFILTER_DEBUG | |
836 | if (skb->dst == NULL) { | |
8394e9b2 | 837 | printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL\n"); |
1da177e4 LT |
838 | goto print_error; |
839 | } | |
1da177e4 LT |
840 | #endif |
841 | ||
842 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
843 | * about the value of skb->pkt_type. */ | |
844 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
845 | skb->pkt_type = PACKET_HOST; | |
846 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
847 | } | |
848 | ||
fc38582d | 849 | nf_bridge_pull_encap_header(skb); |
1da177e4 LT |
850 | nf_bridge_save_header(skb); |
851 | ||
6e23ae2a | 852 | NF_HOOK(pf, NF_INET_POST_ROUTING, skb, NULL, realoutdev, |
2e2f7aef | 853 | br_nf_dev_queue_xmit); |
1da177e4 LT |
854 | |
855 | return NF_STOLEN; | |
856 | ||
857 | #ifdef CONFIG_NETFILTER_DEBUG | |
858 | print_error: | |
859 | if (skb->dev != NULL) { | |
860 | printk("[%s]", skb->dev->name); | |
178a3259 SH |
861 | if (realoutdev) |
862 | printk("[%s]", realoutdev->name); | |
1da177e4 | 863 | } |
98e399f8 | 864 | printk(" head:%p, raw:%p, data:%p\n", skb->head, skb_mac_header(skb), |
789bc3e5 | 865 | skb->data); |
8394e9b2 | 866 | dump_stack(); |
1da177e4 LT |
867 | return NF_ACCEPT; |
868 | #endif | |
869 | } | |
870 | ||
1da177e4 LT |
871 | /* IP/SABOTAGE *****************************************************/ |
872 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
873 | * for the second time. */ | |
3db05fea | 874 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff *skb, |
789bc3e5 SH |
875 | const struct net_device *in, |
876 | const struct net_device *out, | |
877 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 878 | { |
3db05fea HX |
879 | if (skb->nf_bridge && |
880 | !(skb->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
1da177e4 LT |
881 | return NF_STOP; |
882 | } | |
883 | ||
884 | return NF_ACCEPT; | |
885 | } | |
886 | ||
1da177e4 LT |
887 | /* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent |
888 | * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. | |
889 | * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
890 | * ip_refrag() can return NF_STOLEN. */ | |
1999414a | 891 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { |
9d6f229f YH |
892 | { .hook = br_nf_pre_routing, |
893 | .owner = THIS_MODULE, | |
894 | .pf = PF_BRIDGE, | |
895 | .hooknum = NF_BR_PRE_ROUTING, | |
1da177e4 LT |
896 | .priority = NF_BR_PRI_BRNF, }, |
897 | { .hook = br_nf_local_in, | |
898 | .owner = THIS_MODULE, | |
899 | .pf = PF_BRIDGE, | |
900 | .hooknum = NF_BR_LOCAL_IN, | |
901 | .priority = NF_BR_PRI_BRNF, }, | |
902 | { .hook = br_nf_forward_ip, | |
903 | .owner = THIS_MODULE, | |
904 | .pf = PF_BRIDGE, | |
905 | .hooknum = NF_BR_FORWARD, | |
906 | .priority = NF_BR_PRI_BRNF - 1, }, | |
907 | { .hook = br_nf_forward_arp, | |
908 | .owner = THIS_MODULE, | |
909 | .pf = PF_BRIDGE, | |
910 | .hooknum = NF_BR_FORWARD, | |
911 | .priority = NF_BR_PRI_BRNF, }, | |
912 | { .hook = br_nf_local_out, | |
913 | .owner = THIS_MODULE, | |
914 | .pf = PF_BRIDGE, | |
915 | .hooknum = NF_BR_LOCAL_OUT, | |
916 | .priority = NF_BR_PRI_FIRST, }, | |
917 | { .hook = br_nf_post_routing, | |
918 | .owner = THIS_MODULE, | |
919 | .pf = PF_BRIDGE, | |
920 | .hooknum = NF_BR_POST_ROUTING, | |
921 | .priority = NF_BR_PRI_LAST, }, | |
922 | { .hook = ip_sabotage_in, | |
923 | .owner = THIS_MODULE, | |
924 | .pf = PF_INET, | |
6e23ae2a | 925 | .hooknum = NF_INET_PRE_ROUTING, |
1da177e4 LT |
926 | .priority = NF_IP_PRI_FIRST, }, |
927 | { .hook = ip_sabotage_in, | |
928 | .owner = THIS_MODULE, | |
929 | .pf = PF_INET6, | |
6e23ae2a | 930 | .hooknum = NF_INET_PRE_ROUTING, |
1da177e4 | 931 | .priority = NF_IP6_PRI_FIRST, }, |
1da177e4 LT |
932 | }; |
933 | ||
934 | #ifdef CONFIG_SYSCTL | |
935 | static | |
789bc3e5 SH |
936 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp, |
937 | void __user * buffer, size_t * lenp, loff_t * ppos) | |
1da177e4 LT |
938 | { |
939 | int ret; | |
940 | ||
941 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
942 | ||
943 | if (write && *(int *)(ctl->data)) | |
944 | *(int *)(ctl->data) = 1; | |
945 | return ret; | |
946 | } | |
947 | ||
948 | static ctl_table brnf_table[] = { | |
949 | { | |
1da177e4 LT |
950 | .procname = "bridge-nf-call-arptables", |
951 | .data = &brnf_call_arptables, | |
952 | .maxlen = sizeof(int), | |
953 | .mode = 0644, | |
954 | .proc_handler = &brnf_sysctl_call_tables, | |
955 | }, | |
956 | { | |
1da177e4 LT |
957 | .procname = "bridge-nf-call-iptables", |
958 | .data = &brnf_call_iptables, | |
959 | .maxlen = sizeof(int), | |
960 | .mode = 0644, | |
961 | .proc_handler = &brnf_sysctl_call_tables, | |
962 | }, | |
963 | { | |
1da177e4 LT |
964 | .procname = "bridge-nf-call-ip6tables", |
965 | .data = &brnf_call_ip6tables, | |
966 | .maxlen = sizeof(int), | |
967 | .mode = 0644, | |
968 | .proc_handler = &brnf_sysctl_call_tables, | |
969 | }, | |
970 | { | |
1da177e4 LT |
971 | .procname = "bridge-nf-filter-vlan-tagged", |
972 | .data = &brnf_filter_vlan_tagged, | |
973 | .maxlen = sizeof(int), | |
974 | .mode = 0644, | |
975 | .proc_handler = &brnf_sysctl_call_tables, | |
516299d2 MM |
976 | }, |
977 | { | |
516299d2 MM |
978 | .procname = "bridge-nf-filter-pppoe-tagged", |
979 | .data = &brnf_filter_pppoe_tagged, | |
980 | .maxlen = sizeof(int), | |
981 | .mode = 0644, | |
982 | .proc_handler = &brnf_sysctl_call_tables, | |
1da177e4 LT |
983 | }, |
984 | { .ctl_name = 0 } | |
985 | }; | |
986 | ||
b5ccd792 PE |
987 | static struct ctl_path brnf_path[] = { |
988 | { .procname = "net", .ctl_name = CTL_NET, }, | |
989 | { .procname = "bridge", .ctl_name = NET_BRIDGE, }, | |
990 | { } | |
1da177e4 LT |
991 | }; |
992 | #endif | |
993 | ||
5eb87f45 | 994 | int __init br_netfilter_init(void) |
1da177e4 | 995 | { |
5eb87f45 | 996 | int ret; |
1da177e4 | 997 | |
5eb87f45 PM |
998 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
999 | if (ret < 0) | |
1da177e4 | 1000 | return ret; |
1da177e4 | 1001 | #ifdef CONFIG_SYSCTL |
b5ccd792 | 1002 | brnf_sysctl_header = register_sysctl_paths(brnf_path, brnf_table); |
1da177e4 | 1003 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1004 | printk(KERN_WARNING |
1005 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 PM |
1006 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1007 | return -ENOMEM; | |
1da177e4 LT |
1008 | } |
1009 | #endif | |
1da177e4 | 1010 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1011 | return 0; |
1012 | } | |
1013 | ||
1014 | void br_netfilter_fini(void) | |
1015 | { | |
5eb87f45 | 1016 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
1017 | #ifdef CONFIG_SYSCTL |
1018 | unregister_sysctl_table(brnf_sysctl_header); | |
1019 | #endif | |
1020 | } |