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Commit | Line | Data |
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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 | ||
1da177e4 LT |
104 | /* We need these fake structures to make netfilter happy -- |
105 | * lots of places assume that skb->dst != NULL, which isn't | |
106 | * all that unreasonable. | |
107 | * | |
108 | * Currently, we fill in the PMTU entry because netfilter | |
109 | * refragmentation needs it, and the rt_flags entry because | |
110 | * ipt_REJECT needs it. Future netfilter modules might | |
111 | * require us to fill additional fields. */ | |
112 | static struct net_device __fake_net_device = { | |
113 | .hard_header_len = ETH_HLEN | |
114 | }; | |
115 | ||
116 | static struct rtable __fake_rtable = { | |
117 | .u = { | |
118 | .dst = { | |
119 | .__refcnt = ATOMIC_INIT(1), | |
120 | .dev = &__fake_net_device, | |
121 | .path = &__fake_rtable.u.dst, | |
122 | .metrics = {[RTAX_MTU - 1] = 1500}, | |
42cf93cd | 123 | .flags = DST_NOXFRM, |
1da177e4 LT |
124 | } |
125 | }, | |
126 | .rt_flags = 0, | |
127 | }; | |
128 | ||
5dce971a SH |
129 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
130 | { | |
131 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
132 | ||
133 | return port ? port->br->dev : NULL; | |
134 | } | |
1da177e4 | 135 | |
fdeabdef SH |
136 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
137 | { | |
138 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
139 | if (likely(skb->nf_bridge)) | |
140 | atomic_set(&(skb->nf_bridge->use), 1); | |
141 | ||
142 | return skb->nf_bridge; | |
143 | } | |
144 | ||
145 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
146 | { | |
9d6f229f | 147 | int header_size = ETH_HLEN; |
fdeabdef SH |
148 | |
149 | if (skb->protocol == htons(ETH_P_8021Q)) | |
07317621 | 150 | header_size += VLAN_HLEN; |
516299d2 MM |
151 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
152 | header_size += PPPOE_SES_HLEN; | |
fdeabdef | 153 | |
d626f62b ACM |
154 | skb_copy_from_linear_data_offset(skb, -header_size, |
155 | skb->nf_bridge->data, header_size); | |
fdeabdef SH |
156 | } |
157 | ||
07317621 SH |
158 | /* |
159 | * When forwarding bridge frames, we save a copy of the original | |
160 | * header before processing. | |
161 | */ | |
162 | int nf_bridge_copy_header(struct sk_buff *skb) | |
163 | { | |
164 | int err; | |
9d6f229f | 165 | int header_size = ETH_HLEN; |
07317621 SH |
166 | |
167 | if (skb->protocol == htons(ETH_P_8021Q)) | |
168 | header_size += VLAN_HLEN; | |
516299d2 MM |
169 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
170 | header_size += PPPOE_SES_HLEN; | |
07317621 SH |
171 | |
172 | err = skb_cow(skb, header_size); | |
173 | if (err) | |
174 | return err; | |
175 | ||
27d7ff46 ACM |
176 | skb_copy_to_linear_data_offset(skb, -header_size, |
177 | skb->nf_bridge->data, header_size); | |
07317621 SH |
178 | |
179 | if (skb->protocol == htons(ETH_P_8021Q)) | |
180 | __skb_push(skb, VLAN_HLEN); | |
516299d2 MM |
181 | else if (skb->protocol == htons(ETH_P_PPP_SES)) |
182 | __skb_push(skb, PPPOE_SES_HLEN); | |
07317621 SH |
183 | return 0; |
184 | } | |
185 | ||
1da177e4 LT |
186 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
187 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
188 | * bridge PRE_ROUTING hook. */ | |
189 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
190 | { | |
191 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
192 | ||
1da177e4 LT |
193 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
194 | skb->pkt_type = PACKET_OTHERHOST; | |
195 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
196 | } | |
197 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
198 | ||
199 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
200 | dst_hold(skb->dst); | |
201 | ||
202 | skb->dev = nf_bridge->physindev; | |
f8a26028 | 203 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 204 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 205 | skb->network_header -= VLAN_HLEN; |
516299d2 MM |
206 | } else if (skb->protocol == htons(ETH_P_PPP_SES)) { |
207 | skb_push(skb, PPPOE_SES_HLEN); | |
208 | skb->network_header -= PPPOE_SES_HLEN; | |
1da177e4 LT |
209 | } |
210 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
211 | br_handle_frame_finish, 1); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static void __br_dnat_complain(void) | |
217 | { | |
218 | static unsigned long last_complaint; | |
219 | ||
220 | if (jiffies - last_complaint >= 5 * HZ) { | |
221 | printk(KERN_WARNING "Performing cross-bridge DNAT requires IP " | |
789bc3e5 | 222 | "forwarding to be enabled\n"); |
1da177e4 LT |
223 | last_complaint = jiffies; |
224 | } | |
225 | } | |
226 | ||
227 | /* This requires some explaining. If DNAT has taken place, | |
228 | * we will need to fix up the destination Ethernet address, | |
229 | * and this is a tricky process. | |
230 | * | |
231 | * There are two cases to consider: | |
232 | * 1. The packet was DNAT'ed to a device in the same bridge | |
233 | * port group as it was received on. We can still bridge | |
234 | * the packet. | |
235 | * 2. The packet was DNAT'ed to a different device, either | |
236 | * a non-bridged device or another bridge port group. | |
237 | * The packet will need to be routed. | |
238 | * | |
239 | * The correct way of distinguishing between these two cases is to | |
240 | * call ip_route_input() and to look at skb->dst->dev, which is | |
241 | * changed to the destination device if ip_route_input() succeeds. | |
242 | * | |
243 | * Let us first consider the case that ip_route_input() succeeds: | |
244 | * | |
245 | * If skb->dst->dev equals the logical bridge device the packet | |
246 | * came in on, we can consider this bridging. We then call | |
247 | * skb->dst->output() which will make the packet enter br_nf_local_out() | |
248 | * not much later. In that function it is assured that the iptables | |
249 | * FORWARD chain is traversed for the packet. | |
250 | * | |
251 | * Otherwise, the packet is considered to be routed and we just | |
252 | * change the destination MAC address so that the packet will | |
f216f082 BDS |
253 | * later be passed up to the IP stack to be routed. For a redirected |
254 | * packet, ip_route_input() will give back the localhost as output device, | |
255 | * which differs from the bridge device. | |
1da177e4 LT |
256 | * |
257 | * Let us now consider the case that ip_route_input() fails: | |
258 | * | |
f216f082 BDS |
259 | * This can be because the destination address is martian, in which case |
260 | * the packet will be dropped. | |
1da177e4 LT |
261 | * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input() |
262 | * will fail, while __ip_route_output_key() will return success. The source | |
263 | * address for __ip_route_output_key() is set to zero, so __ip_route_output_key | |
264 | * thinks we're handling a locally generated packet and won't care | |
265 | * if IP forwarding is allowed. We send a warning message to the users's | |
266 | * log telling her to put IP forwarding on. | |
267 | * | |
268 | * ip_route_input() will also fail if there is no route available. | |
269 | * In that case we just drop the packet. | |
270 | * | |
271 | * --Lennert, 20020411 | |
272 | * --Bart, 20020416 (updated) | |
f216f082 BDS |
273 | * --Bart, 20021007 (updated) |
274 | * --Bart, 20062711 (updated) */ | |
1da177e4 LT |
275 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) |
276 | { | |
1da177e4 LT |
277 | if (skb->pkt_type == PACKET_OTHERHOST) { |
278 | skb->pkt_type = PACKET_HOST; | |
279 | skb->nf_bridge->mask |= BRNF_PKT_TYPE; | |
280 | } | |
281 | skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
282 | ||
283 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
284 | if (!skb->dev) |
285 | kfree_skb(skb); | |
286 | else { | |
f8a26028 | 287 | if (skb->protocol == htons(ETH_P_8021Q)) { |
5dce971a | 288 | skb_pull(skb, VLAN_HLEN); |
b0e380b1 | 289 | skb->network_header += VLAN_HLEN; |
516299d2 MM |
290 | } else if (skb->protocol == htons(ETH_P_PPP_SES)) { |
291 | skb_pull(skb, PPPOE_SES_HLEN); | |
292 | skb->network_header += PPPOE_SES_HLEN; | |
5dce971a SH |
293 | } |
294 | skb->dst->output(skb); | |
1da177e4 | 295 | } |
1da177e4 LT |
296 | return 0; |
297 | } | |
298 | ||
299 | static int br_nf_pre_routing_finish(struct sk_buff *skb) | |
300 | { | |
301 | struct net_device *dev = skb->dev; | |
eddc9ec5 | 302 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 303 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; |
f216f082 | 304 | int err; |
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; | |
1da177e4 | 311 | if (dnat_took_place(skb)) { |
f216f082 | 312 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { |
1da177e4 | 313 | struct rtable *rt; |
789bc3e5 SH |
314 | struct flowi fl = { |
315 | .nl_u = { | |
316 | .ip4_u = { | |
317 | .daddr = iph->daddr, | |
318 | .saddr = 0, | |
319 | .tos = RT_TOS(iph->tos) }, | |
320 | }, | |
321 | .proto = 0, | |
322 | }; | |
f216f082 BDS |
323 | struct in_device *in_dev = in_dev_get(dev); |
324 | ||
325 | /* If err equals -EHOSTUNREACH the error is due to a | |
326 | * martian destination or due to the fact that | |
327 | * forwarding is disabled. For most martian packets, | |
328 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
329 | * martian destinations: loopback destinations and destination | |
330 | * 0.0.0.0. In both cases the packet will be dropped because the | |
331 | * destination is the loopback device and not the bridge. */ | |
332 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
333 | goto free_skb; | |
1da177e4 LT |
334 | |
335 | if (!ip_route_output_key(&rt, &fl)) { | |
1c011bed | 336 | /* - Bridged-and-DNAT'ed traffic doesn't |
f216f082 BDS |
337 | * require ip_forwarding. */ |
338 | if (((struct dst_entry *)rt)->dev == dev) { | |
1da177e4 LT |
339 | skb->dst = (struct dst_entry *)rt; |
340 | goto bridged_dnat; | |
341 | } | |
f216f082 BDS |
342 | /* we are sure that forwarding is disabled, so printing |
343 | * this message is no problem. Note that the packet could | |
344 | * still have a martian destination address, in which case | |
345 | * the packet could be dropped even if forwarding were enabled */ | |
1da177e4 LT |
346 | __br_dnat_complain(); |
347 | dst_release((struct dst_entry *)rt); | |
348 | } | |
f216f082 | 349 | free_skb: |
1da177e4 LT |
350 | kfree_skb(skb); |
351 | return 0; | |
352 | } else { | |
353 | if (skb->dst->dev == dev) { | |
354 | bridged_dnat: | |
355 | /* Tell br_nf_local_out this is a | |
356 | * bridged frame */ | |
357 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
358 | skb->dev = nf_bridge->physindev; | |
359 | if (skb->protocol == | |
f8a26028 | 360 | htons(ETH_P_8021Q)) { |
1da177e4 | 361 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 362 | skb->network_header -= VLAN_HLEN; |
516299d2 MM |
363 | } else if(skb->protocol == |
364 | htons(ETH_P_PPP_SES)) { | |
365 | skb_push(skb, PPPOE_SES_HLEN); | |
366 | skb->network_header -= PPPOE_SES_HLEN; | |
1da177e4 LT |
367 | } |
368 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, | |
369 | skb, skb->dev, NULL, | |
370 | br_nf_pre_routing_finish_bridge, | |
371 | 1); | |
372 | return 0; | |
373 | } | |
789bc3e5 | 374 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
375 | skb->pkt_type = PACKET_HOST; |
376 | } | |
377 | } else { | |
378 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
379 | dst_hold(skb->dst); | |
380 | } | |
381 | ||
382 | skb->dev = nf_bridge->physindev; | |
f8a26028 | 383 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 384 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 385 | skb->network_header -= VLAN_HLEN; |
516299d2 MM |
386 | } else if (skb->protocol == htons(ETH_P_PPP_SES)) { |
387 | skb_push(skb, PPPOE_SES_HLEN); | |
388 | skb->network_header -= PPPOE_SES_HLEN; | |
1da177e4 LT |
389 | } |
390 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
391 | br_handle_frame_finish, 1); | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 397 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
398 | { |
399 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
400 | ||
401 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
402 | skb->pkt_type = PACKET_HOST; | |
403 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
404 | } | |
405 | ||
406 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
407 | nf_bridge->physindev = skb->dev; | |
408 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
409 | |
410 | return skb->dev; | |
1da177e4 LT |
411 | } |
412 | ||
413 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
414 | static int check_hbh_len(struct sk_buff *skb) | |
415 | { | |
0660e03f | 416 | unsigned char *raw = (u8 *)(ipv6_hdr(skb) + 1); |
1da177e4 | 417 | u32 pkt_len; |
d56f90a7 ACM |
418 | const unsigned char *nh = skb_network_header(skb); |
419 | int off = raw - nh; | |
789bc3e5 | 420 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
421 | |
422 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
423 | goto bad; | |
424 | ||
425 | off += 2; | |
426 | len -= 2; | |
427 | ||
428 | while (len > 0) { | |
d56f90a7 | 429 | int optlen = nh[off + 1] + 2; |
1da177e4 | 430 | |
d56f90a7 | 431 | switch (nh[off]) { |
1da177e4 LT |
432 | case IPV6_TLV_PAD0: |
433 | optlen = 1; | |
434 | break; | |
435 | ||
436 | case IPV6_TLV_PADN: | |
437 | break; | |
438 | ||
439 | case IPV6_TLV_JUMBO: | |
d56f90a7 | 440 | if (nh[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 441 | goto bad; |
d56f90a7 | 442 | pkt_len = ntohl(*(__be32 *) (nh + off + 2)); |
b0366486 | 443 | if (pkt_len <= IPV6_MAXPLEN || |
0660e03f | 444 | ipv6_hdr(skb)->payload_len) |
b0366486 | 445 | goto bad; |
1da177e4 LT |
446 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
447 | goto bad; | |
b0366486 | 448 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 449 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 450 | goto bad; |
d56f90a7 | 451 | nh = skb_network_header(skb); |
1da177e4 LT |
452 | break; |
453 | default: | |
454 | if (optlen > len) | |
455 | goto bad; | |
456 | break; | |
457 | } | |
458 | off += optlen; | |
459 | len -= optlen; | |
460 | } | |
461 | if (len == 0) | |
462 | return 0; | |
463 | bad: | |
464 | return -1; | |
465 | ||
466 | } | |
467 | ||
468 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
469 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
470 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
471 | struct sk_buff *skb, |
472 | const struct net_device *in, | |
473 | const struct net_device *out, | |
474 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
475 | { |
476 | struct ipv6hdr *hdr; | |
477 | u32 pkt_len; | |
1da177e4 LT |
478 | |
479 | if (skb->len < sizeof(struct ipv6hdr)) | |
480 | goto inhdr_error; | |
481 | ||
482 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
483 | goto inhdr_error; | |
484 | ||
0660e03f | 485 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
486 | |
487 | if (hdr->version != 6) | |
488 | goto inhdr_error; | |
489 | ||
490 | pkt_len = ntohs(hdr->payload_len); | |
491 | ||
492 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
493 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
494 | goto inhdr_error; | |
b38dfee3 HX |
495 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
496 | goto inhdr_error; | |
1da177e4 LT |
497 | } |
498 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 499 | goto inhdr_error; |
1da177e4 | 500 | |
789bc3e5 | 501 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 502 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 503 | return NF_DROP; |
5dce971a SH |
504 | if (!setup_pre_routing(skb)) |
505 | return NF_DROP; | |
1da177e4 LT |
506 | |
507 | NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL, | |
508 | br_nf_pre_routing_finish_ipv6); | |
509 | ||
510 | return NF_STOLEN; | |
511 | ||
512 | inhdr_error: | |
513 | return NF_DROP; | |
514 | } | |
515 | ||
516 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
517 | * Replicate the checks that IPv4 does on packet reception. | |
518 | * Set skb->dev to the bridge device (i.e. parent of the | |
519 | * receiving device) to make netfilter happy, the REDIRECT | |
520 | * target in particular. Save the original destination IP | |
521 | * address to be able to detect DNAT afterwards. */ | |
522 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, | |
ee02b3a6 SH |
523 | const struct net_device *in, |
524 | const struct net_device *out, | |
525 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
526 | { |
527 | struct iphdr *iph; | |
528 | __u32 len; | |
529 | struct sk_buff *skb = *pskb; | |
1da177e4 | 530 | |
516299d2 MM |
531 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || |
532 | IS_PPPOE_IPV6(skb)) { | |
1da177e4 LT |
533 | #ifdef CONFIG_SYSCTL |
534 | if (!brnf_call_ip6tables) | |
535 | return NF_ACCEPT; | |
536 | #endif | |
537 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
538 | goto out; | |
539 | ||
f8a26028 | 540 | if (skb->protocol == htons(ETH_P_8021Q)) { |
cbb042f9 | 541 | skb_pull_rcsum(skb, VLAN_HLEN); |
b0e380b1 | 542 | skb->network_header += VLAN_HLEN; |
516299d2 MM |
543 | } else if (skb->protocol == htons(ETH_P_PPP_SES)) { |
544 | skb_pull_rcsum(skb, PPPOE_SES_HLEN); | |
545 | skb->network_header += PPPOE_SES_HLEN; | |
1da177e4 LT |
546 | } |
547 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); | |
548 | } | |
549 | #ifdef CONFIG_SYSCTL | |
550 | if (!brnf_call_iptables) | |
551 | return NF_ACCEPT; | |
552 | #endif | |
553 | ||
516299d2 MM |
554 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb) && |
555 | !IS_PPPOE_IP(skb)) | |
1da177e4 LT |
556 | return NF_ACCEPT; |
557 | ||
558 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
559 | goto out; | |
560 | ||
f8a26028 | 561 | if (skb->protocol == htons(ETH_P_8021Q)) { |
cbb042f9 | 562 | skb_pull_rcsum(skb, VLAN_HLEN); |
b0e380b1 | 563 | skb->network_header += VLAN_HLEN; |
516299d2 MM |
564 | } else if (skb->protocol == htons(ETH_P_PPP_SES)) { |
565 | skb_pull_rcsum(skb, PPPOE_SES_HLEN); | |
566 | skb->network_header += PPPOE_SES_HLEN; | |
1da177e4 LT |
567 | } |
568 | ||
569 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
570 | goto inhdr_error; | |
571 | ||
eddc9ec5 | 572 | iph = ip_hdr(skb); |
1da177e4 LT |
573 | if (iph->ihl < 5 || iph->version != 4) |
574 | goto inhdr_error; | |
575 | ||
789bc3e5 | 576 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
577 | goto inhdr_error; |
578 | ||
eddc9ec5 | 579 | iph = ip_hdr(skb); |
789bc3e5 | 580 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
581 | goto inhdr_error; |
582 | ||
583 | len = ntohs(iph->tot_len); | |
789bc3e5 | 584 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
585 | goto inhdr_error; |
586 | ||
b38dfee3 | 587 | pskb_trim_rcsum(skb, len); |
1da177e4 | 588 | |
789bc3e5 | 589 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 590 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 591 | return NF_DROP; |
5dce971a SH |
592 | if (!setup_pre_routing(skb)) |
593 | return NF_DROP; | |
1da177e4 LT |
594 | store_orig_dstaddr(skb); |
595 | ||
596 | NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL, | |
597 | br_nf_pre_routing_finish); | |
598 | ||
599 | return NF_STOLEN; | |
600 | ||
601 | inhdr_error: | |
789bc3e5 | 602 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
603 | out: |
604 | return NF_DROP; | |
605 | } | |
606 | ||
607 | ||
608 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
609 | /* The packet is locally destined, which requires a real | |
610 | * dst_entry, so detach the fake one. On the way up, the | |
611 | * packet would pass through PRE_ROUTING again (which already | |
612 | * took place when the packet entered the bridge), but we | |
613 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
614 | * prevent this from happening. */ | |
615 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
616 | const struct net_device *in, |
617 | const struct net_device *out, | |
618 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
619 | { |
620 | struct sk_buff *skb = *pskb; | |
621 | ||
622 | if (skb->dst == (struct dst_entry *)&__fake_rtable) { | |
623 | dst_release(skb->dst); | |
624 | skb->dst = NULL; | |
625 | } | |
626 | ||
627 | return NF_ACCEPT; | |
628 | } | |
629 | ||
1da177e4 LT |
630 | /* PF_BRIDGE/FORWARD *************************************************/ |
631 | static int br_nf_forward_finish(struct sk_buff *skb) | |
632 | { | |
633 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
634 | struct net_device *in; | |
1da177e4 | 635 | |
8b42ec39 | 636 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
637 | in = nf_bridge->physindev; |
638 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
639 | skb->pkt_type = PACKET_OTHERHOST; | |
640 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
641 | } | |
642 | } else { | |
643 | in = *((struct net_device **)(skb->cb)); | |
644 | } | |
f8a26028 | 645 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 646 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 647 | skb->network_header -= VLAN_HLEN; |
516299d2 MM |
648 | } else if (skb->protocol == htons(ETH_P_PPP_SES)) { |
649 | skb_push(skb, PPPOE_SES_HLEN); | |
650 | skb->network_header -= PPPOE_SES_HLEN; | |
1da177e4 LT |
651 | } |
652 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, | |
789bc3e5 | 653 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
654 | return 0; |
655 | } | |
656 | ||
657 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
658 | * netfilter with indev and outdev set to the bridge device, | |
659 | * but we are still able to filter on the 'real' indev/outdev | |
660 | * because of the physdev module. For ARP, indev and outdev are the | |
661 | * bridge ports. */ | |
662 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
663 | const struct net_device *in, |
664 | const struct net_device *out, | |
665 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
666 | { |
667 | struct sk_buff *skb = *pskb; | |
668 | struct nf_bridge_info *nf_bridge; | |
5dce971a | 669 | struct net_device *parent; |
1da177e4 LT |
670 | int pf; |
671 | ||
672 | if (!skb->nf_bridge) | |
673 | return NF_ACCEPT; | |
674 | ||
5dce971a SH |
675 | parent = bridge_parent(out); |
676 | if (!parent) | |
677 | return NF_DROP; | |
678 | ||
516299d2 MM |
679 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
680 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
681 | pf = PF_INET; |
682 | else | |
683 | pf = PF_INET6; | |
684 | ||
f8a26028 | 685 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 686 | skb_pull(*pskb, VLAN_HLEN); |
b0e380b1 | 687 | (*pskb)->network_header += VLAN_HLEN; |
516299d2 MM |
688 | } else if (skb->protocol == htons(ETH_P_PPP_SES)) { |
689 | skb_pull(*pskb, PPPOE_SES_HLEN); | |
690 | (*pskb)->network_header += PPPOE_SES_HLEN; | |
1da177e4 LT |
691 | } |
692 | ||
1da177e4 LT |
693 | nf_bridge = skb->nf_bridge; |
694 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
695 | skb->pkt_type = PACKET_HOST; | |
696 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
697 | } | |
698 | ||
699 | /* The physdev module checks on this */ | |
700 | nf_bridge->mask |= BRNF_BRIDGED; | |
701 | nf_bridge->physoutdev = skb->dev; | |
702 | ||
5dce971a SH |
703 | NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), parent, |
704 | br_nf_forward_finish); | |
1da177e4 LT |
705 | |
706 | return NF_STOLEN; | |
707 | } | |
708 | ||
709 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
710 | const struct net_device *in, |
711 | const struct net_device *out, | |
712 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
713 | { |
714 | struct sk_buff *skb = *pskb; | |
1da177e4 LT |
715 | struct net_device **d = (struct net_device **)(skb->cb); |
716 | ||
717 | #ifdef CONFIG_SYSCTL | |
718 | if (!brnf_call_arptables) | |
719 | return NF_ACCEPT; | |
720 | #endif | |
721 | ||
f8a26028 | 722 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 723 | if (!IS_VLAN_ARP(skb)) |
1da177e4 LT |
724 | return NF_ACCEPT; |
725 | skb_pull(*pskb, VLAN_HLEN); | |
b0e380b1 | 726 | (*pskb)->network_header += VLAN_HLEN; |
1da177e4 LT |
727 | } |
728 | ||
d0a92be0 | 729 | if (arp_hdr(skb)->ar_pln != 4) { |
8b42ec39 | 730 | if (IS_VLAN_ARP(skb)) { |
1da177e4 | 731 | skb_push(*pskb, VLAN_HLEN); |
b0e380b1 | 732 | (*pskb)->network_header -= VLAN_HLEN; |
1da177e4 LT |
733 | } |
734 | return NF_ACCEPT; | |
735 | } | |
736 | *d = (struct net_device *)in; | |
737 | NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, | |
738 | (struct net_device *)out, br_nf_forward_finish); | |
739 | ||
740 | return NF_STOLEN; | |
741 | } | |
742 | ||
2bf540b7 PM |
743 | /* PF_BRIDGE/LOCAL_OUT *********************************************** |
744 | * | |
745 | * This function sees both locally originated IP packets and forwarded | |
1da177e4 LT |
746 | * IP packets (in both cases the destination device is a bridge |
747 | * device). It also sees bridged-and-DNAT'ed packets. | |
1da177e4 LT |
748 | * |
749 | * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged | |
750 | * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() | |
751 | * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority | |
752 | * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor | |
753 | * will be executed. | |
2bf540b7 | 754 | */ |
1da177e4 | 755 | static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb, |
789bc3e5 SH |
756 | const struct net_device *in, |
757 | const struct net_device *out, | |
758 | int (*okfn)(struct sk_buff *)) | |
1da177e4 | 759 | { |
2bf540b7 | 760 | struct net_device *realindev; |
1da177e4 LT |
761 | struct sk_buff *skb = *pskb; |
762 | struct nf_bridge_info *nf_bridge; | |
1da177e4 LT |
763 | |
764 | if (!skb->nf_bridge) | |
765 | return NF_ACCEPT; | |
766 | ||
1da177e4 | 767 | nf_bridge = skb->nf_bridge; |
2bf540b7 PM |
768 | if (!(nf_bridge->mask & BRNF_BRIDGED_DNAT)) |
769 | return NF_ACCEPT; | |
1da177e4 LT |
770 | |
771 | /* Bridged, take PF_BRIDGE/FORWARD. | |
772 | * (see big note in front of br_nf_pre_routing_finish) */ | |
2bf540b7 PM |
773 | nf_bridge->physoutdev = skb->dev; |
774 | realindev = nf_bridge->physindev; | |
1da177e4 | 775 | |
2bf540b7 PM |
776 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
777 | skb->pkt_type = PACKET_OTHERHOST; | |
778 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
1da177e4 | 779 | } |
f8a26028 | 780 | if (skb->protocol == htons(ETH_P_8021Q)) { |
2bf540b7 | 781 | skb_push(skb, VLAN_HLEN); |
b0e380b1 | 782 | skb->network_header -= VLAN_HLEN; |
516299d2 MM |
783 | } else if (skb->protocol == htons(ETH_P_PPP_SES)) { |
784 | skb_push(skb, PPPOE_SES_HLEN); | |
785 | skb->network_header -= PPPOE_SES_HLEN; | |
1da177e4 LT |
786 | } |
787 | ||
2bf540b7 PM |
788 | NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, skb->dev, |
789 | br_forward_finish); | |
1da177e4 LT |
790 | return NF_STOLEN; |
791 | } | |
792 | ||
2e2f7aef PM |
793 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
794 | { | |
795 | if (skb->protocol == htons(ETH_P_IP) && | |
796 | skb->len > skb->dev->mtu && | |
89114afd | 797 | !skb_is_gso(skb)) |
2e2f7aef PM |
798 | return ip_fragment(skb, br_dev_queue_push_xmit); |
799 | else | |
800 | return br_dev_queue_push_xmit(skb); | |
801 | } | |
1da177e4 LT |
802 | |
803 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
804 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
805 | const struct net_device *in, |
806 | const struct net_device *out, | |
807 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
808 | { |
809 | struct sk_buff *skb = *pskb; | |
810 | struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge; | |
1da177e4 LT |
811 | struct net_device *realoutdev = bridge_parent(skb->dev); |
812 | int pf; | |
813 | ||
814 | #ifdef CONFIG_NETFILTER_DEBUG | |
815 | /* Be very paranoid. This probably won't happen anymore, but let's | |
816 | * keep the check just to be sure... */ | |
98e399f8 ACM |
817 | if (skb_mac_header(skb) < skb->head || |
818 | skb_mac_header(skb) + ETH_HLEN > skb->data) { | |
1da177e4 | 819 | printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " |
8394e9b2 | 820 | "bad mac.raw pointer.\n"); |
1da177e4 LT |
821 | goto print_error; |
822 | } | |
823 | #endif | |
824 | ||
825 | if (!nf_bridge) | |
826 | return NF_ACCEPT; | |
827 | ||
5dce971a SH |
828 | if (!realoutdev) |
829 | return NF_DROP; | |
830 | ||
516299d2 MM |
831 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb) || |
832 | IS_PPPOE_IP(skb)) | |
1da177e4 LT |
833 | pf = PF_INET; |
834 | else | |
835 | pf = PF_INET6; | |
836 | ||
837 | #ifdef CONFIG_NETFILTER_DEBUG | |
838 | if (skb->dst == NULL) { | |
8394e9b2 | 839 | printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL\n"); |
1da177e4 LT |
840 | goto print_error; |
841 | } | |
1da177e4 LT |
842 | #endif |
843 | ||
844 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
845 | * about the value of skb->pkt_type. */ | |
846 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
847 | skb->pkt_type = PACKET_HOST; | |
848 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
849 | } | |
850 | ||
f8a26028 | 851 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 | 852 | skb_pull(skb, VLAN_HLEN); |
b0e380b1 | 853 | skb->network_header += VLAN_HLEN; |
516299d2 MM |
854 | } else if (skb->protocol == htons(ETH_P_PPP_SES)) { |
855 | skb_pull(skb, PPPOE_SES_HLEN); | |
856 | skb->network_header += PPPOE_SES_HLEN; | |
1da177e4 LT |
857 | } |
858 | ||
859 | nf_bridge_save_header(skb); | |
860 | ||
861 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
862 | if (nf_bridge->netoutdev) | |
863 | realoutdev = nf_bridge->netoutdev; | |
864 | #endif | |
865 | NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev, | |
2e2f7aef | 866 | br_nf_dev_queue_xmit); |
1da177e4 LT |
867 | |
868 | return NF_STOLEN; | |
869 | ||
870 | #ifdef CONFIG_NETFILTER_DEBUG | |
871 | print_error: | |
872 | if (skb->dev != NULL) { | |
873 | printk("[%s]", skb->dev->name); | |
178a3259 SH |
874 | if (realoutdev) |
875 | printk("[%s]", realoutdev->name); | |
1da177e4 | 876 | } |
98e399f8 | 877 | printk(" head:%p, raw:%p, data:%p\n", skb->head, skb_mac_header(skb), |
789bc3e5 | 878 | skb->data); |
8394e9b2 | 879 | dump_stack(); |
1da177e4 LT |
880 | return NF_ACCEPT; |
881 | #endif | |
882 | } | |
883 | ||
1da177e4 LT |
884 | /* IP/SABOTAGE *****************************************************/ |
885 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
886 | * for the second time. */ | |
887 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
888 | const struct net_device *in, |
889 | const struct net_device *out, | |
890 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
891 | { |
892 | if ((*pskb)->nf_bridge && | |
893 | !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
894 | return NF_STOP; | |
895 | } | |
896 | ||
897 | return NF_ACCEPT; | |
898 | } | |
899 | ||
1da177e4 LT |
900 | /* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent |
901 | * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. | |
902 | * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
903 | * ip_refrag() can return NF_STOLEN. */ | |
904 | static struct nf_hook_ops br_nf_ops[] = { | |
9d6f229f YH |
905 | { .hook = br_nf_pre_routing, |
906 | .owner = THIS_MODULE, | |
907 | .pf = PF_BRIDGE, | |
908 | .hooknum = NF_BR_PRE_ROUTING, | |
1da177e4 LT |
909 | .priority = NF_BR_PRI_BRNF, }, |
910 | { .hook = br_nf_local_in, | |
911 | .owner = THIS_MODULE, | |
912 | .pf = PF_BRIDGE, | |
913 | .hooknum = NF_BR_LOCAL_IN, | |
914 | .priority = NF_BR_PRI_BRNF, }, | |
915 | { .hook = br_nf_forward_ip, | |
916 | .owner = THIS_MODULE, | |
917 | .pf = PF_BRIDGE, | |
918 | .hooknum = NF_BR_FORWARD, | |
919 | .priority = NF_BR_PRI_BRNF - 1, }, | |
920 | { .hook = br_nf_forward_arp, | |
921 | .owner = THIS_MODULE, | |
922 | .pf = PF_BRIDGE, | |
923 | .hooknum = NF_BR_FORWARD, | |
924 | .priority = NF_BR_PRI_BRNF, }, | |
925 | { .hook = br_nf_local_out, | |
926 | .owner = THIS_MODULE, | |
927 | .pf = PF_BRIDGE, | |
928 | .hooknum = NF_BR_LOCAL_OUT, | |
929 | .priority = NF_BR_PRI_FIRST, }, | |
930 | { .hook = br_nf_post_routing, | |
931 | .owner = THIS_MODULE, | |
932 | .pf = PF_BRIDGE, | |
933 | .hooknum = NF_BR_POST_ROUTING, | |
934 | .priority = NF_BR_PRI_LAST, }, | |
935 | { .hook = ip_sabotage_in, | |
936 | .owner = THIS_MODULE, | |
937 | .pf = PF_INET, | |
938 | .hooknum = NF_IP_PRE_ROUTING, | |
939 | .priority = NF_IP_PRI_FIRST, }, | |
940 | { .hook = ip_sabotage_in, | |
941 | .owner = THIS_MODULE, | |
942 | .pf = PF_INET6, | |
943 | .hooknum = NF_IP6_PRE_ROUTING, | |
944 | .priority = NF_IP6_PRI_FIRST, }, | |
1da177e4 LT |
945 | }; |
946 | ||
947 | #ifdef CONFIG_SYSCTL | |
948 | static | |
789bc3e5 SH |
949 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp, |
950 | void __user * buffer, size_t * lenp, loff_t * ppos) | |
1da177e4 LT |
951 | { |
952 | int ret; | |
953 | ||
954 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
955 | ||
956 | if (write && *(int *)(ctl->data)) | |
957 | *(int *)(ctl->data) = 1; | |
958 | return ret; | |
959 | } | |
960 | ||
961 | static ctl_table brnf_table[] = { | |
962 | { | |
963 | .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES, | |
964 | .procname = "bridge-nf-call-arptables", | |
965 | .data = &brnf_call_arptables, | |
966 | .maxlen = sizeof(int), | |
967 | .mode = 0644, | |
968 | .proc_handler = &brnf_sysctl_call_tables, | |
969 | }, | |
970 | { | |
971 | .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES, | |
972 | .procname = "bridge-nf-call-iptables", | |
973 | .data = &brnf_call_iptables, | |
974 | .maxlen = sizeof(int), | |
975 | .mode = 0644, | |
976 | .proc_handler = &brnf_sysctl_call_tables, | |
977 | }, | |
978 | { | |
979 | .ctl_name = NET_BRIDGE_NF_CALL_IP6TABLES, | |
980 | .procname = "bridge-nf-call-ip6tables", | |
981 | .data = &brnf_call_ip6tables, | |
982 | .maxlen = sizeof(int), | |
983 | .mode = 0644, | |
984 | .proc_handler = &brnf_sysctl_call_tables, | |
985 | }, | |
986 | { | |
987 | .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED, | |
988 | .procname = "bridge-nf-filter-vlan-tagged", | |
989 | .data = &brnf_filter_vlan_tagged, | |
990 | .maxlen = sizeof(int), | |
991 | .mode = 0644, | |
992 | .proc_handler = &brnf_sysctl_call_tables, | |
516299d2 MM |
993 | }, |
994 | { | |
995 | .ctl_name = NET_BRIDGE_NF_FILTER_PPPOE_TAGGED, | |
996 | .procname = "bridge-nf-filter-pppoe-tagged", | |
997 | .data = &brnf_filter_pppoe_tagged, | |
998 | .maxlen = sizeof(int), | |
999 | .mode = 0644, | |
1000 | .proc_handler = &brnf_sysctl_call_tables, | |
1da177e4 LT |
1001 | }, |
1002 | { .ctl_name = 0 } | |
1003 | }; | |
1004 | ||
1005 | static ctl_table brnf_bridge_table[] = { | |
1006 | { | |
1007 | .ctl_name = NET_BRIDGE, | |
1008 | .procname = "bridge", | |
1009 | .mode = 0555, | |
1010 | .child = brnf_table, | |
1011 | }, | |
1012 | { .ctl_name = 0 } | |
1013 | }; | |
1014 | ||
1015 | static ctl_table brnf_net_table[] = { | |
1016 | { | |
1017 | .ctl_name = CTL_NET, | |
1018 | .procname = "net", | |
1019 | .mode = 0555, | |
1020 | .child = brnf_bridge_table, | |
1021 | }, | |
1022 | { .ctl_name = 0 } | |
1023 | }; | |
1024 | #endif | |
1025 | ||
5eb87f45 | 1026 | int __init br_netfilter_init(void) |
1da177e4 | 1027 | { |
5eb87f45 | 1028 | int ret; |
1da177e4 | 1029 | |
5eb87f45 PM |
1030 | ret = nf_register_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1031 | if (ret < 0) | |
1da177e4 | 1032 | return ret; |
1da177e4 | 1033 | #ifdef CONFIG_SYSCTL |
0b4d4147 | 1034 | brnf_sysctl_header = register_sysctl_table(brnf_net_table); |
1da177e4 | 1035 | if (brnf_sysctl_header == NULL) { |
789bc3e5 SH |
1036 | printk(KERN_WARNING |
1037 | "br_netfilter: can't register to sysctl.\n"); | |
5eb87f45 PM |
1038 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1039 | return -ENOMEM; | |
1da177e4 LT |
1040 | } |
1041 | #endif | |
1da177e4 | 1042 | printk(KERN_NOTICE "Bridge firewalling registered\n"); |
1da177e4 LT |
1043 | return 0; |
1044 | } | |
1045 | ||
1046 | void br_netfilter_fini(void) | |
1047 | { | |
5eb87f45 | 1048 | nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops)); |
1da177e4 LT |
1049 | #ifdef CONFIG_SYSCTL |
1050 | unregister_sysctl_table(brnf_sysctl_header); | |
1051 | #endif | |
1052 | } |