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> | |
32 | #include <linux/netfilter_bridge.h> | |
33 | #include <linux/netfilter_ipv4.h> | |
34 | #include <linux/netfilter_ipv6.h> | |
35 | #include <linux/netfilter_arp.h> | |
36 | #include <linux/in_route.h> | |
14c85021 | 37 | |
1da177e4 LT |
38 | #include <net/ip.h> |
39 | #include <net/ipv6.h> | |
14c85021 ACM |
40 | #include <net/route.h> |
41 | ||
1da177e4 | 42 | #include <asm/uaccess.h> |
1da177e4 LT |
43 | #include "br_private.h" |
44 | #ifdef CONFIG_SYSCTL | |
45 | #include <linux/sysctl.h> | |
46 | #endif | |
47 | ||
48 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
49 | (skb->nf_bridge->data))->daddr.ipv4) | |
50 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = (skb)->nh.iph->daddr) | |
51 | #define dnat_took_place(skb) (skb_origaddr(skb) != (skb)->nh.iph->daddr) | |
52 | ||
1da177e4 LT |
53 | #ifdef CONFIG_SYSCTL |
54 | static struct ctl_table_header *brnf_sysctl_header; | |
9c1ea148 BH |
55 | static int brnf_call_iptables __read_mostly = 1; |
56 | static int brnf_call_ip6tables __read_mostly = 1; | |
57 | static int brnf_call_arptables __read_mostly = 1; | |
58 | static int brnf_filter_vlan_tagged __read_mostly = 1; | |
1da177e4 LT |
59 | #else |
60 | #define brnf_filter_vlan_tagged 1 | |
61 | #endif | |
62 | ||
10ea6ac8 PM |
63 | int brnf_deferred_hooks; |
64 | EXPORT_SYMBOL_GPL(brnf_deferred_hooks); | |
65 | ||
8b42ec39 SH |
66 | static __be16 inline vlan_proto(const struct sk_buff *skb) |
67 | { | |
68 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
69 | } | |
70 | ||
71 | #define IS_VLAN_IP(skb) \ | |
72 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
73 | vlan_proto(skb) == htons(ETH_P_IP) && \ | |
74 | brnf_filter_vlan_tagged) | |
75 | ||
76 | #define IS_VLAN_IPV6(skb) \ | |
77 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
78 | vlan_proto(skb) == htons(ETH_P_IPV6) &&\ | |
79 | brnf_filter_vlan_tagged) | |
80 | ||
81 | #define IS_VLAN_ARP(skb) \ | |
82 | (skb->protocol == htons(ETH_P_8021Q) && \ | |
83 | vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
84 | brnf_filter_vlan_tagged) | |
1da177e4 LT |
85 | |
86 | /* We need these fake structures to make netfilter happy -- | |
87 | * lots of places assume that skb->dst != NULL, which isn't | |
88 | * all that unreasonable. | |
89 | * | |
90 | * Currently, we fill in the PMTU entry because netfilter | |
91 | * refragmentation needs it, and the rt_flags entry because | |
92 | * ipt_REJECT needs it. Future netfilter modules might | |
93 | * require us to fill additional fields. */ | |
94 | static struct net_device __fake_net_device = { | |
95 | .hard_header_len = ETH_HLEN | |
96 | }; | |
97 | ||
98 | static struct rtable __fake_rtable = { | |
99 | .u = { | |
100 | .dst = { | |
101 | .__refcnt = ATOMIC_INIT(1), | |
102 | .dev = &__fake_net_device, | |
103 | .path = &__fake_rtable.u.dst, | |
104 | .metrics = {[RTAX_MTU - 1] = 1500}, | |
42cf93cd | 105 | .flags = DST_NOXFRM, |
1da177e4 LT |
106 | } |
107 | }, | |
108 | .rt_flags = 0, | |
109 | }; | |
110 | ||
5dce971a SH |
111 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
112 | { | |
113 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
114 | ||
115 | return port ? port->br->dev : NULL; | |
116 | } | |
1da177e4 | 117 | |
fdeabdef SH |
118 | static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb) |
119 | { | |
120 | skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC); | |
121 | if (likely(skb->nf_bridge)) | |
122 | atomic_set(&(skb->nf_bridge->use), 1); | |
123 | ||
124 | return skb->nf_bridge; | |
125 | } | |
126 | ||
127 | static inline void nf_bridge_save_header(struct sk_buff *skb) | |
128 | { | |
07317621 | 129 | int header_size = ETH_HLEN; |
fdeabdef SH |
130 | |
131 | if (skb->protocol == htons(ETH_P_8021Q)) | |
07317621 | 132 | header_size += VLAN_HLEN; |
fdeabdef SH |
133 | |
134 | memcpy(skb->nf_bridge->data, skb->data - header_size, header_size); | |
135 | } | |
136 | ||
07317621 SH |
137 | /* |
138 | * When forwarding bridge frames, we save a copy of the original | |
139 | * header before processing. | |
140 | */ | |
141 | int nf_bridge_copy_header(struct sk_buff *skb) | |
142 | { | |
143 | int err; | |
144 | int header_size = ETH_HLEN; | |
145 | ||
146 | if (skb->protocol == htons(ETH_P_8021Q)) | |
147 | header_size += VLAN_HLEN; | |
148 | ||
149 | err = skb_cow(skb, header_size); | |
150 | if (err) | |
151 | return err; | |
152 | ||
153 | memcpy(skb->data - header_size, skb->nf_bridge->data, header_size); | |
154 | ||
155 | if (skb->protocol == htons(ETH_P_8021Q)) | |
156 | __skb_push(skb, VLAN_HLEN); | |
157 | return 0; | |
158 | } | |
159 | ||
1da177e4 LT |
160 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ |
161 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
162 | * bridge PRE_ROUTING hook. */ | |
163 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
164 | { | |
165 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
166 | ||
1da177e4 LT |
167 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
168 | skb->pkt_type = PACKET_OTHERHOST; | |
169 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
170 | } | |
171 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
172 | ||
173 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
174 | dst_hold(skb->dst); | |
175 | ||
176 | skb->dev = nf_bridge->physindev; | |
f8a26028 | 177 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
178 | skb_push(skb, VLAN_HLEN); |
179 | skb->nh.raw -= VLAN_HLEN; | |
180 | } | |
181 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
182 | br_handle_frame_finish, 1); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static void __br_dnat_complain(void) | |
188 | { | |
189 | static unsigned long last_complaint; | |
190 | ||
191 | if (jiffies - last_complaint >= 5 * HZ) { | |
192 | printk(KERN_WARNING "Performing cross-bridge DNAT requires IP " | |
789bc3e5 | 193 | "forwarding to be enabled\n"); |
1da177e4 LT |
194 | last_complaint = jiffies; |
195 | } | |
196 | } | |
197 | ||
198 | /* This requires some explaining. If DNAT has taken place, | |
199 | * we will need to fix up the destination Ethernet address, | |
200 | * and this is a tricky process. | |
201 | * | |
202 | * There are two cases to consider: | |
203 | * 1. The packet was DNAT'ed to a device in the same bridge | |
204 | * port group as it was received on. We can still bridge | |
205 | * the packet. | |
206 | * 2. The packet was DNAT'ed to a different device, either | |
207 | * a non-bridged device or another bridge port group. | |
208 | * The packet will need to be routed. | |
209 | * | |
210 | * The correct way of distinguishing between these two cases is to | |
211 | * call ip_route_input() and to look at skb->dst->dev, which is | |
212 | * changed to the destination device if ip_route_input() succeeds. | |
213 | * | |
214 | * Let us first consider the case that ip_route_input() succeeds: | |
215 | * | |
216 | * If skb->dst->dev equals the logical bridge device the packet | |
217 | * came in on, we can consider this bridging. We then call | |
218 | * skb->dst->output() which will make the packet enter br_nf_local_out() | |
219 | * not much later. In that function it is assured that the iptables | |
220 | * FORWARD chain is traversed for the packet. | |
221 | * | |
222 | * Otherwise, the packet is considered to be routed and we just | |
223 | * change the destination MAC address so that the packet will | |
224 | * later be passed up to the IP stack to be routed. | |
225 | * | |
226 | * Let us now consider the case that ip_route_input() fails: | |
227 | * | |
228 | * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input() | |
229 | * will fail, while __ip_route_output_key() will return success. The source | |
230 | * address for __ip_route_output_key() is set to zero, so __ip_route_output_key | |
231 | * thinks we're handling a locally generated packet and won't care | |
232 | * if IP forwarding is allowed. We send a warning message to the users's | |
233 | * log telling her to put IP forwarding on. | |
234 | * | |
235 | * ip_route_input() will also fail if there is no route available. | |
236 | * In that case we just drop the packet. | |
237 | * | |
238 | * --Lennert, 20020411 | |
239 | * --Bart, 20020416 (updated) | |
240 | * --Bart, 20021007 (updated) */ | |
241 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
242 | { | |
1da177e4 LT |
243 | if (skb->pkt_type == PACKET_OTHERHOST) { |
244 | skb->pkt_type = PACKET_HOST; | |
245 | skb->nf_bridge->mask |= BRNF_PKT_TYPE; | |
246 | } | |
247 | skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
248 | ||
249 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
250 | if (!skb->dev) |
251 | kfree_skb(skb); | |
252 | else { | |
f8a26028 | 253 | if (skb->protocol == htons(ETH_P_8021Q)) { |
5dce971a SH |
254 | skb_pull(skb, VLAN_HLEN); |
255 | skb->nh.raw += VLAN_HLEN; | |
256 | } | |
257 | skb->dst->output(skb); | |
1da177e4 | 258 | } |
1da177e4 LT |
259 | return 0; |
260 | } | |
261 | ||
262 | static int br_nf_pre_routing_finish(struct sk_buff *skb) | |
263 | { | |
264 | struct net_device *dev = skb->dev; | |
265 | struct iphdr *iph = skb->nh.iph; | |
266 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
267 | ||
1da177e4 LT |
268 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
269 | skb->pkt_type = PACKET_OTHERHOST; | |
270 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
271 | } | |
272 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
273 | ||
274 | if (dnat_took_place(skb)) { | |
789bc3e5 | 275 | if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev)) { |
1da177e4 | 276 | struct rtable *rt; |
789bc3e5 SH |
277 | struct flowi fl = { |
278 | .nl_u = { | |
279 | .ip4_u = { | |
280 | .daddr = iph->daddr, | |
281 | .saddr = 0, | |
282 | .tos = RT_TOS(iph->tos) }, | |
283 | }, | |
284 | .proto = 0, | |
285 | }; | |
1da177e4 LT |
286 | |
287 | if (!ip_route_output_key(&rt, &fl)) { | |
1c011bed BDS |
288 | /* - Bridged-and-DNAT'ed traffic doesn't |
289 | * require ip_forwarding. | |
290 | * - Deal with redirected traffic. */ | |
291 | if (((struct dst_entry *)rt)->dev == dev || | |
292 | rt->rt_type == RTN_LOCAL) { | |
1da177e4 LT |
293 | skb->dst = (struct dst_entry *)rt; |
294 | goto bridged_dnat; | |
295 | } | |
296 | __br_dnat_complain(); | |
297 | dst_release((struct dst_entry *)rt); | |
298 | } | |
299 | kfree_skb(skb); | |
300 | return 0; | |
301 | } else { | |
302 | if (skb->dst->dev == dev) { | |
303 | bridged_dnat: | |
304 | /* Tell br_nf_local_out this is a | |
305 | * bridged frame */ | |
306 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
307 | skb->dev = nf_bridge->physindev; | |
308 | if (skb->protocol == | |
f8a26028 | 309 | htons(ETH_P_8021Q)) { |
1da177e4 LT |
310 | skb_push(skb, VLAN_HLEN); |
311 | skb->nh.raw -= VLAN_HLEN; | |
312 | } | |
313 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, | |
314 | skb, skb->dev, NULL, | |
315 | br_nf_pre_routing_finish_bridge, | |
316 | 1); | |
317 | return 0; | |
318 | } | |
789bc3e5 | 319 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
320 | skb->pkt_type = PACKET_HOST; |
321 | } | |
322 | } else { | |
323 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
324 | dst_hold(skb->dst); | |
325 | } | |
326 | ||
327 | skb->dev = nf_bridge->physindev; | |
f8a26028 | 328 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
329 | skb_push(skb, VLAN_HLEN); |
330 | skb->nh.raw -= VLAN_HLEN; | |
331 | } | |
332 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
333 | br_handle_frame_finish, 1); | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 339 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
340 | { |
341 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
342 | ||
343 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
344 | skb->pkt_type = PACKET_HOST; | |
345 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
346 | } | |
347 | ||
348 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
349 | nf_bridge->physindev = skb->dev; | |
350 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
351 | |
352 | return skb->dev; | |
1da177e4 LT |
353 | } |
354 | ||
355 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
356 | static int check_hbh_len(struct sk_buff *skb) | |
357 | { | |
789bc3e5 | 358 | unsigned char *raw = (u8 *) (skb->nh.ipv6h + 1); |
1da177e4 LT |
359 | u32 pkt_len; |
360 | int off = raw - skb->nh.raw; | |
789bc3e5 | 361 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
362 | |
363 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
364 | goto bad; | |
365 | ||
366 | off += 2; | |
367 | len -= 2; | |
368 | ||
369 | while (len > 0) { | |
789bc3e5 | 370 | int optlen = skb->nh.raw[off + 1] + 2; |
1da177e4 LT |
371 | |
372 | switch (skb->nh.raw[off]) { | |
373 | case IPV6_TLV_PAD0: | |
374 | optlen = 1; | |
375 | break; | |
376 | ||
377 | case IPV6_TLV_PADN: | |
378 | break; | |
379 | ||
380 | case IPV6_TLV_JUMBO: | |
789bc3e5 | 381 | if (skb->nh.raw[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 382 | goto bad; |
47c183fa | 383 | pkt_len = ntohl(*(__be32 *) (skb->nh.raw + off + 2)); |
b0366486 BDS |
384 | if (pkt_len <= IPV6_MAXPLEN || |
385 | skb->nh.ipv6h->payload_len) | |
386 | goto bad; | |
1da177e4 LT |
387 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
388 | goto bad; | |
b0366486 | 389 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 390 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 391 | goto bad; |
1da177e4 LT |
392 | break; |
393 | default: | |
394 | if (optlen > len) | |
395 | goto bad; | |
396 | break; | |
397 | } | |
398 | off += optlen; | |
399 | len -= optlen; | |
400 | } | |
401 | if (len == 0) | |
402 | return 0; | |
403 | bad: | |
404 | return -1; | |
405 | ||
406 | } | |
407 | ||
408 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
409 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
410 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
411 | struct sk_buff *skb, |
412 | const struct net_device *in, | |
413 | const struct net_device *out, | |
414 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
415 | { |
416 | struct ipv6hdr *hdr; | |
417 | u32 pkt_len; | |
1da177e4 LT |
418 | |
419 | if (skb->len < sizeof(struct ipv6hdr)) | |
420 | goto inhdr_error; | |
421 | ||
422 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
423 | goto inhdr_error; | |
424 | ||
425 | hdr = skb->nh.ipv6h; | |
426 | ||
427 | if (hdr->version != 6) | |
428 | goto inhdr_error; | |
429 | ||
430 | pkt_len = ntohs(hdr->payload_len); | |
431 | ||
432 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
433 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
434 | goto inhdr_error; | |
b38dfee3 HX |
435 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) |
436 | goto inhdr_error; | |
1da177e4 LT |
437 | } |
438 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 439 | goto inhdr_error; |
1da177e4 | 440 | |
789bc3e5 | 441 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 442 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 443 | return NF_DROP; |
5dce971a SH |
444 | if (!setup_pre_routing(skb)) |
445 | return NF_DROP; | |
1da177e4 LT |
446 | |
447 | NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL, | |
448 | br_nf_pre_routing_finish_ipv6); | |
449 | ||
450 | return NF_STOLEN; | |
451 | ||
452 | inhdr_error: | |
453 | return NF_DROP; | |
454 | } | |
455 | ||
456 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
457 | * Replicate the checks that IPv4 does on packet reception. | |
458 | * Set skb->dev to the bridge device (i.e. parent of the | |
459 | * receiving device) to make netfilter happy, the REDIRECT | |
460 | * target in particular. Save the original destination IP | |
461 | * address to be able to detect DNAT afterwards. */ | |
462 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, | |
ee02b3a6 SH |
463 | const struct net_device *in, |
464 | const struct net_device *out, | |
465 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
466 | { |
467 | struct iphdr *iph; | |
468 | __u32 len; | |
469 | struct sk_buff *skb = *pskb; | |
1da177e4 | 470 | |
8b42ec39 | 471 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb)) { |
1da177e4 LT |
472 | #ifdef CONFIG_SYSCTL |
473 | if (!brnf_call_ip6tables) | |
474 | return NF_ACCEPT; | |
475 | #endif | |
476 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
477 | goto out; | |
478 | ||
f8a26028 | 479 | if (skb->protocol == htons(ETH_P_8021Q)) { |
cbb042f9 | 480 | skb_pull_rcsum(skb, VLAN_HLEN); |
ee02b3a6 | 481 | skb->nh.raw += VLAN_HLEN; |
1da177e4 LT |
482 | } |
483 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); | |
484 | } | |
485 | #ifdef CONFIG_SYSCTL | |
486 | if (!brnf_call_iptables) | |
487 | return NF_ACCEPT; | |
488 | #endif | |
489 | ||
8b42ec39 | 490 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb)) |
1da177e4 LT |
491 | return NF_ACCEPT; |
492 | ||
493 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
494 | goto out; | |
495 | ||
f8a26028 | 496 | if (skb->protocol == htons(ETH_P_8021Q)) { |
cbb042f9 | 497 | skb_pull_rcsum(skb, VLAN_HLEN); |
ee02b3a6 | 498 | skb->nh.raw += VLAN_HLEN; |
1da177e4 LT |
499 | } |
500 | ||
501 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
502 | goto inhdr_error; | |
503 | ||
504 | iph = skb->nh.iph; | |
505 | if (iph->ihl < 5 || iph->version != 4) | |
506 | goto inhdr_error; | |
507 | ||
789bc3e5 | 508 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
509 | goto inhdr_error; |
510 | ||
511 | iph = skb->nh.iph; | |
789bc3e5 | 512 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
513 | goto inhdr_error; |
514 | ||
515 | len = ntohs(iph->tot_len); | |
789bc3e5 | 516 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
517 | goto inhdr_error; |
518 | ||
b38dfee3 | 519 | pskb_trim_rcsum(skb, len); |
1da177e4 | 520 | |
789bc3e5 | 521 | nf_bridge_put(skb->nf_bridge); |
fdeabdef | 522 | if (!nf_bridge_alloc(skb)) |
1da177e4 | 523 | return NF_DROP; |
5dce971a SH |
524 | if (!setup_pre_routing(skb)) |
525 | return NF_DROP; | |
1da177e4 LT |
526 | store_orig_dstaddr(skb); |
527 | ||
528 | NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL, | |
529 | br_nf_pre_routing_finish); | |
530 | ||
531 | return NF_STOLEN; | |
532 | ||
533 | inhdr_error: | |
789bc3e5 | 534 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
535 | out: |
536 | return NF_DROP; | |
537 | } | |
538 | ||
539 | ||
540 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
541 | /* The packet is locally destined, which requires a real | |
542 | * dst_entry, so detach the fake one. On the way up, the | |
543 | * packet would pass through PRE_ROUTING again (which already | |
544 | * took place when the packet entered the bridge), but we | |
545 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
546 | * prevent this from happening. */ | |
547 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
548 | const struct net_device *in, |
549 | const struct net_device *out, | |
550 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
551 | { |
552 | struct sk_buff *skb = *pskb; | |
553 | ||
554 | if (skb->dst == (struct dst_entry *)&__fake_rtable) { | |
555 | dst_release(skb->dst); | |
556 | skb->dst = NULL; | |
557 | } | |
558 | ||
559 | return NF_ACCEPT; | |
560 | } | |
561 | ||
1da177e4 LT |
562 | /* PF_BRIDGE/FORWARD *************************************************/ |
563 | static int br_nf_forward_finish(struct sk_buff *skb) | |
564 | { | |
565 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
566 | struct net_device *in; | |
1da177e4 | 567 | |
8b42ec39 | 568 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) { |
1da177e4 LT |
569 | in = nf_bridge->physindev; |
570 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
571 | skb->pkt_type = PACKET_OTHERHOST; | |
572 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
573 | } | |
574 | } else { | |
575 | in = *((struct net_device **)(skb->cb)); | |
576 | } | |
f8a26028 | 577 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
578 | skb_push(skb, VLAN_HLEN); |
579 | skb->nh.raw -= VLAN_HLEN; | |
580 | } | |
581 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, | |
789bc3e5 | 582 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
583 | return 0; |
584 | } | |
585 | ||
586 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
587 | * netfilter with indev and outdev set to the bridge device, | |
588 | * but we are still able to filter on the 'real' indev/outdev | |
589 | * because of the physdev module. For ARP, indev and outdev are the | |
590 | * bridge ports. */ | |
591 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
592 | const struct net_device *in, |
593 | const struct net_device *out, | |
594 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
595 | { |
596 | struct sk_buff *skb = *pskb; | |
597 | struct nf_bridge_info *nf_bridge; | |
5dce971a | 598 | struct net_device *parent; |
1da177e4 LT |
599 | int pf; |
600 | ||
601 | if (!skb->nf_bridge) | |
602 | return NF_ACCEPT; | |
603 | ||
5dce971a SH |
604 | parent = bridge_parent(out); |
605 | if (!parent) | |
606 | return NF_DROP; | |
607 | ||
8b42ec39 | 608 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb)) |
1da177e4 LT |
609 | pf = PF_INET; |
610 | else | |
611 | pf = PF_INET6; | |
612 | ||
f8a26028 | 613 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
614 | skb_pull(*pskb, VLAN_HLEN); |
615 | (*pskb)->nh.raw += VLAN_HLEN; | |
616 | } | |
617 | ||
1da177e4 LT |
618 | nf_bridge = skb->nf_bridge; |
619 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
620 | skb->pkt_type = PACKET_HOST; | |
621 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
622 | } | |
623 | ||
624 | /* The physdev module checks on this */ | |
625 | nf_bridge->mask |= BRNF_BRIDGED; | |
626 | nf_bridge->physoutdev = skb->dev; | |
627 | ||
5dce971a SH |
628 | NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), parent, |
629 | br_nf_forward_finish); | |
1da177e4 LT |
630 | |
631 | return NF_STOLEN; | |
632 | } | |
633 | ||
634 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
635 | const struct net_device *in, |
636 | const struct net_device *out, | |
637 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
638 | { |
639 | struct sk_buff *skb = *pskb; | |
1da177e4 LT |
640 | struct net_device **d = (struct net_device **)(skb->cb); |
641 | ||
642 | #ifdef CONFIG_SYSCTL | |
643 | if (!brnf_call_arptables) | |
644 | return NF_ACCEPT; | |
645 | #endif | |
646 | ||
f8a26028 | 647 | if (skb->protocol != htons(ETH_P_ARP)) { |
8b42ec39 | 648 | if (!IS_VLAN_ARP(skb)) |
1da177e4 LT |
649 | return NF_ACCEPT; |
650 | skb_pull(*pskb, VLAN_HLEN); | |
651 | (*pskb)->nh.raw += VLAN_HLEN; | |
652 | } | |
653 | ||
1da177e4 | 654 | if (skb->nh.arph->ar_pln != 4) { |
8b42ec39 | 655 | if (IS_VLAN_ARP(skb)) { |
1da177e4 LT |
656 | skb_push(*pskb, VLAN_HLEN); |
657 | (*pskb)->nh.raw -= VLAN_HLEN; | |
658 | } | |
659 | return NF_ACCEPT; | |
660 | } | |
661 | *d = (struct net_device *)in; | |
662 | NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, | |
663 | (struct net_device *)out, br_nf_forward_finish); | |
664 | ||
665 | return NF_STOLEN; | |
666 | } | |
667 | ||
1da177e4 LT |
668 | /* PF_BRIDGE/LOCAL_OUT ***********************************************/ |
669 | static int br_nf_local_out_finish(struct sk_buff *skb) | |
670 | { | |
f8a26028 | 671 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
672 | skb_push(skb, VLAN_HLEN); |
673 | skb->nh.raw -= VLAN_HLEN; | |
674 | } | |
675 | ||
676 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, | |
789bc3e5 | 677 | br_forward_finish, NF_BR_PRI_FIRST + 1); |
1da177e4 LT |
678 | |
679 | return 0; | |
680 | } | |
681 | ||
682 | /* This function sees both locally originated IP packets and forwarded | |
683 | * IP packets (in both cases the destination device is a bridge | |
684 | * device). It also sees bridged-and-DNAT'ed packets. | |
685 | * To be able to filter on the physical bridge devices (with the physdev | |
686 | * module), we steal packets destined to a bridge device away from the | |
687 | * PF_INET/FORWARD and PF_INET/OUTPUT hook functions, and give them back later, | |
688 | * when we have determined the real output device. This is done in here. | |
689 | * | |
690 | * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged | |
691 | * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() | |
692 | * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority | |
693 | * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor | |
694 | * will be executed. | |
695 | * Otherwise, if nf_bridge->physindev is NULL, the bridge-nf code never touched | |
696 | * this packet before, and so the packet was locally originated. We fake | |
697 | * the PF_INET/LOCAL_OUT hook. | |
698 | * Finally, if nf_bridge->physindev isn't NULL, then the packet was IP routed, | |
699 | * so we fake the PF_INET/FORWARD hook. ip_sabotage_out() makes sure | |
700 | * even routed packets that didn't arrive on a bridge interface have their | |
701 | * nf_bridge->physindev set. */ | |
702 | static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
703 | const struct net_device *in, |
704 | const struct net_device *out, | |
705 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
706 | { |
707 | struct net_device *realindev, *realoutdev; | |
708 | struct sk_buff *skb = *pskb; | |
709 | struct nf_bridge_info *nf_bridge; | |
1da177e4 LT |
710 | int pf; |
711 | ||
712 | if (!skb->nf_bridge) | |
713 | return NF_ACCEPT; | |
714 | ||
8b42ec39 | 715 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb)) |
1da177e4 LT |
716 | pf = PF_INET; |
717 | else | |
718 | pf = PF_INET6; | |
719 | ||
1da177e4 LT |
720 | nf_bridge = skb->nf_bridge; |
721 | nf_bridge->physoutdev = skb->dev; | |
722 | realindev = nf_bridge->physindev; | |
723 | ||
724 | /* Bridged, take PF_BRIDGE/FORWARD. | |
725 | * (see big note in front of br_nf_pre_routing_finish) */ | |
726 | if (nf_bridge->mask & BRNF_BRIDGED_DNAT) { | |
727 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
728 | skb->pkt_type = PACKET_OTHERHOST; | |
729 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
730 | } | |
f8a26028 | 731 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
732 | skb_push(skb, VLAN_HLEN); |
733 | skb->nh.raw -= VLAN_HLEN; | |
734 | } | |
735 | ||
736 | NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, | |
737 | skb->dev, br_forward_finish); | |
738 | goto out; | |
739 | } | |
740 | realoutdev = bridge_parent(skb->dev); | |
5dce971a SH |
741 | if (!realoutdev) |
742 | return NF_DROP; | |
1da177e4 LT |
743 | |
744 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
745 | /* iptables should match -o br0.x */ | |
746 | if (nf_bridge->netoutdev) | |
747 | realoutdev = nf_bridge->netoutdev; | |
748 | #endif | |
f8a26028 | 749 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
750 | skb_pull(skb, VLAN_HLEN); |
751 | (*pskb)->nh.raw += VLAN_HLEN; | |
752 | } | |
753 | /* IP forwarded traffic has a physindev, locally | |
754 | * generated traffic hasn't. */ | |
755 | if (realindev != NULL) { | |
789bc3e5 | 756 | if (!(nf_bridge->mask & BRNF_DONT_TAKE_PARENT)) { |
5dce971a SH |
757 | struct net_device *parent = bridge_parent(realindev); |
758 | if (parent) | |
759 | realindev = parent; | |
760 | } | |
1da177e4 LT |
761 | |
762 | NF_HOOK_THRESH(pf, NF_IP_FORWARD, skb, realindev, | |
763 | realoutdev, br_nf_local_out_finish, | |
764 | NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD + 1); | |
765 | } else { | |
1da177e4 LT |
766 | NF_HOOK_THRESH(pf, NF_IP_LOCAL_OUT, skb, realindev, |
767 | realoutdev, br_nf_local_out_finish, | |
768 | NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1); | |
769 | } | |
770 | ||
771 | out: | |
772 | return NF_STOLEN; | |
773 | } | |
774 | ||
2e2f7aef PM |
775 | static int br_nf_dev_queue_xmit(struct sk_buff *skb) |
776 | { | |
777 | if (skb->protocol == htons(ETH_P_IP) && | |
778 | skb->len > skb->dev->mtu && | |
89114afd | 779 | !skb_is_gso(skb)) |
2e2f7aef PM |
780 | return ip_fragment(skb, br_dev_queue_push_xmit); |
781 | else | |
782 | return br_dev_queue_push_xmit(skb); | |
783 | } | |
1da177e4 LT |
784 | |
785 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
786 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
787 | const struct net_device *in, |
788 | const struct net_device *out, | |
789 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
790 | { |
791 | struct sk_buff *skb = *pskb; | |
792 | struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge; | |
1da177e4 LT |
793 | struct net_device *realoutdev = bridge_parent(skb->dev); |
794 | int pf; | |
795 | ||
796 | #ifdef CONFIG_NETFILTER_DEBUG | |
797 | /* Be very paranoid. This probably won't happen anymore, but let's | |
798 | * keep the check just to be sure... */ | |
799 | if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) { | |
800 | printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " | |
8394e9b2 | 801 | "bad mac.raw pointer.\n"); |
1da177e4 LT |
802 | goto print_error; |
803 | } | |
804 | #endif | |
805 | ||
806 | if (!nf_bridge) | |
807 | return NF_ACCEPT; | |
808 | ||
5dce971a SH |
809 | if (!realoutdev) |
810 | return NF_DROP; | |
811 | ||
8b42ec39 | 812 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb)) |
1da177e4 LT |
813 | pf = PF_INET; |
814 | else | |
815 | pf = PF_INET6; | |
816 | ||
817 | #ifdef CONFIG_NETFILTER_DEBUG | |
818 | if (skb->dst == NULL) { | |
8394e9b2 | 819 | printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL\n"); |
1da177e4 LT |
820 | goto print_error; |
821 | } | |
1da177e4 LT |
822 | #endif |
823 | ||
824 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
825 | * about the value of skb->pkt_type. */ | |
826 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
827 | skb->pkt_type = PACKET_HOST; | |
828 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
829 | } | |
830 | ||
f8a26028 | 831 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
832 | skb_pull(skb, VLAN_HLEN); |
833 | skb->nh.raw += VLAN_HLEN; | |
834 | } | |
835 | ||
836 | nf_bridge_save_header(skb); | |
837 | ||
838 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
839 | if (nf_bridge->netoutdev) | |
840 | realoutdev = nf_bridge->netoutdev; | |
841 | #endif | |
842 | NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev, | |
2e2f7aef | 843 | br_nf_dev_queue_xmit); |
1da177e4 LT |
844 | |
845 | return NF_STOLEN; | |
846 | ||
847 | #ifdef CONFIG_NETFILTER_DEBUG | |
848 | print_error: | |
849 | if (skb->dev != NULL) { | |
850 | printk("[%s]", skb->dev->name); | |
178a3259 SH |
851 | if (realoutdev) |
852 | printk("[%s]", realoutdev->name); | |
1da177e4 LT |
853 | } |
854 | printk(" head:%p, raw:%p, data:%p\n", skb->head, skb->mac.raw, | |
789bc3e5 | 855 | skb->data); |
8394e9b2 | 856 | dump_stack(); |
1da177e4 LT |
857 | return NF_ACCEPT; |
858 | #endif | |
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. */ | |
864 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
865 | const struct net_device *in, |
866 | const struct net_device *out, | |
867 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
868 | { |
869 | if ((*pskb)->nf_bridge && | |
870 | !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
871 | return NF_STOP; | |
872 | } | |
873 | ||
874 | return NF_ACCEPT; | |
875 | } | |
876 | ||
877 | /* Postpone execution of PF_INET(6)/FORWARD, PF_INET(6)/LOCAL_OUT | |
878 | * and PF_INET(6)/POST_ROUTING until we have done the forwarding | |
879 | * decision in the bridge code and have determined nf_bridge->physoutdev. */ | |
880 | static unsigned int ip_sabotage_out(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
881 | const struct net_device *in, |
882 | const struct net_device *out, | |
883 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
884 | { |
885 | struct sk_buff *skb = *pskb; | |
886 | ||
887 | if ((out->hard_start_xmit == br_dev_xmit && | |
789bc3e5 | 888 | okfn != br_nf_forward_finish && |
2e2f7aef | 889 | okfn != br_nf_local_out_finish && okfn != br_nf_dev_queue_xmit) |
1da177e4 LT |
890 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
891 | || ((out->priv_flags & IFF_802_1Q_VLAN) && | |
789bc3e5 | 892 | VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit) |
1da177e4 LT |
893 | #endif |
894 | ) { | |
895 | struct nf_bridge_info *nf_bridge; | |
896 | ||
897 | if (!skb->nf_bridge) { | |
898 | #ifdef CONFIG_SYSCTL | |
899 | /* This code is executed while in the IP(v6) stack, | |
900 | the version should be 4 or 6. We can't use | |
901 | skb->protocol because that isn't set on | |
902 | PF_INET(6)/LOCAL_OUT. */ | |
903 | struct iphdr *ip = skb->nh.iph; | |
904 | ||
905 | if (ip->version == 4 && !brnf_call_iptables) | |
906 | return NF_ACCEPT; | |
907 | else if (ip->version == 6 && !brnf_call_ip6tables) | |
908 | return NF_ACCEPT; | |
10ea6ac8 PM |
909 | else if (!brnf_deferred_hooks) |
910 | return NF_ACCEPT; | |
1da177e4 LT |
911 | #endif |
912 | if (hook == NF_IP_POST_ROUTING) | |
913 | return NF_ACCEPT; | |
914 | if (!nf_bridge_alloc(skb)) | |
915 | return NF_DROP; | |
916 | } | |
917 | ||
918 | nf_bridge = skb->nf_bridge; | |
919 | ||
920 | /* This frame will arrive on PF_BRIDGE/LOCAL_OUT and we | |
921 | * will need the indev then. For a brouter, the real indev | |
922 | * can be a bridge port, so we make sure br_nf_local_out() | |
923 | * doesn't use the bridge parent of the indev by using | |
924 | * the BRNF_DONT_TAKE_PARENT mask. */ | |
925 | if (hook == NF_IP_FORWARD && nf_bridge->physindev == NULL) { | |
9666dae5 | 926 | nf_bridge->mask |= BRNF_DONT_TAKE_PARENT; |
1da177e4 LT |
927 | nf_bridge->physindev = (struct net_device *)in; |
928 | } | |
929 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
930 | /* the iptables outdev is br0.x, not br0 */ | |
931 | if (out->priv_flags & IFF_802_1Q_VLAN) | |
932 | nf_bridge->netoutdev = (struct net_device *)out; | |
933 | #endif | |
934 | return NF_STOP; | |
935 | } | |
936 | ||
937 | return NF_ACCEPT; | |
938 | } | |
939 | ||
940 | /* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent | |
941 | * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. | |
942 | * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
943 | * ip_refrag() can return NF_STOLEN. */ | |
944 | static struct nf_hook_ops br_nf_ops[] = { | |
945 | { .hook = br_nf_pre_routing, | |
946 | .owner = THIS_MODULE, | |
947 | .pf = PF_BRIDGE, | |
948 | .hooknum = NF_BR_PRE_ROUTING, | |
949 | .priority = NF_BR_PRI_BRNF, }, | |
950 | { .hook = br_nf_local_in, | |
951 | .owner = THIS_MODULE, | |
952 | .pf = PF_BRIDGE, | |
953 | .hooknum = NF_BR_LOCAL_IN, | |
954 | .priority = NF_BR_PRI_BRNF, }, | |
955 | { .hook = br_nf_forward_ip, | |
956 | .owner = THIS_MODULE, | |
957 | .pf = PF_BRIDGE, | |
958 | .hooknum = NF_BR_FORWARD, | |
959 | .priority = NF_BR_PRI_BRNF - 1, }, | |
960 | { .hook = br_nf_forward_arp, | |
961 | .owner = THIS_MODULE, | |
962 | .pf = PF_BRIDGE, | |
963 | .hooknum = NF_BR_FORWARD, | |
964 | .priority = NF_BR_PRI_BRNF, }, | |
965 | { .hook = br_nf_local_out, | |
966 | .owner = THIS_MODULE, | |
967 | .pf = PF_BRIDGE, | |
968 | .hooknum = NF_BR_LOCAL_OUT, | |
969 | .priority = NF_BR_PRI_FIRST, }, | |
970 | { .hook = br_nf_post_routing, | |
971 | .owner = THIS_MODULE, | |
972 | .pf = PF_BRIDGE, | |
973 | .hooknum = NF_BR_POST_ROUTING, | |
974 | .priority = NF_BR_PRI_LAST, }, | |
975 | { .hook = ip_sabotage_in, | |
976 | .owner = THIS_MODULE, | |
977 | .pf = PF_INET, | |
978 | .hooknum = NF_IP_PRE_ROUTING, | |
979 | .priority = NF_IP_PRI_FIRST, }, | |
980 | { .hook = ip_sabotage_in, | |
981 | .owner = THIS_MODULE, | |
982 | .pf = PF_INET6, | |
983 | .hooknum = NF_IP6_PRE_ROUTING, | |
984 | .priority = NF_IP6_PRI_FIRST, }, | |
985 | { .hook = ip_sabotage_out, | |
986 | .owner = THIS_MODULE, | |
987 | .pf = PF_INET, | |
988 | .hooknum = NF_IP_FORWARD, | |
989 | .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, }, | |
990 | { .hook = ip_sabotage_out, | |
991 | .owner = THIS_MODULE, | |
992 | .pf = PF_INET6, | |
993 | .hooknum = NF_IP6_FORWARD, | |
994 | .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_FORWARD, }, | |
995 | { .hook = ip_sabotage_out, | |
996 | .owner = THIS_MODULE, | |
997 | .pf = PF_INET, | |
998 | .hooknum = NF_IP_LOCAL_OUT, | |
999 | .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, }, | |
1000 | { .hook = ip_sabotage_out, | |
1001 | .owner = THIS_MODULE, | |
1002 | .pf = PF_INET6, | |
1003 | .hooknum = NF_IP6_LOCAL_OUT, | |
1004 | .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, }, | |
1005 | { .hook = ip_sabotage_out, | |
1006 | .owner = THIS_MODULE, | |
1007 | .pf = PF_INET, | |
1008 | .hooknum = NF_IP_POST_ROUTING, | |
1009 | .priority = NF_IP_PRI_FIRST, }, | |
1010 | { .hook = ip_sabotage_out, | |
1011 | .owner = THIS_MODULE, | |
1012 | .pf = PF_INET6, | |
1013 | .hooknum = NF_IP6_POST_ROUTING, | |
1014 | .priority = NF_IP6_PRI_FIRST, }, | |
1015 | }; | |
1016 | ||
1017 | #ifdef CONFIG_SYSCTL | |
1018 | static | |
789bc3e5 SH |
1019 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp, |
1020 | void __user * buffer, size_t * lenp, loff_t * ppos) | |
1da177e4 LT |
1021 | { |
1022 | int ret; | |
1023 | ||
1024 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1025 | ||
1026 | if (write && *(int *)(ctl->data)) | |
1027 | *(int *)(ctl->data) = 1; | |
1028 | return ret; | |
1029 | } | |
1030 | ||
1031 | static ctl_table brnf_table[] = { | |
1032 | { | |
1033 | .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES, | |
1034 | .procname = "bridge-nf-call-arptables", | |
1035 | .data = &brnf_call_arptables, | |
1036 | .maxlen = sizeof(int), | |
1037 | .mode = 0644, | |
1038 | .proc_handler = &brnf_sysctl_call_tables, | |
1039 | }, | |
1040 | { | |
1041 | .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES, | |
1042 | .procname = "bridge-nf-call-iptables", | |
1043 | .data = &brnf_call_iptables, | |
1044 | .maxlen = sizeof(int), | |
1045 | .mode = 0644, | |
1046 | .proc_handler = &brnf_sysctl_call_tables, | |
1047 | }, | |
1048 | { | |
1049 | .ctl_name = NET_BRIDGE_NF_CALL_IP6TABLES, | |
1050 | .procname = "bridge-nf-call-ip6tables", | |
1051 | .data = &brnf_call_ip6tables, | |
1052 | .maxlen = sizeof(int), | |
1053 | .mode = 0644, | |
1054 | .proc_handler = &brnf_sysctl_call_tables, | |
1055 | }, | |
1056 | { | |
1057 | .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED, | |
1058 | .procname = "bridge-nf-filter-vlan-tagged", | |
1059 | .data = &brnf_filter_vlan_tagged, | |
1060 | .maxlen = sizeof(int), | |
1061 | .mode = 0644, | |
1062 | .proc_handler = &brnf_sysctl_call_tables, | |
1063 | }, | |
1064 | { .ctl_name = 0 } | |
1065 | }; | |
1066 | ||
1067 | static ctl_table brnf_bridge_table[] = { | |
1068 | { | |
1069 | .ctl_name = NET_BRIDGE, | |
1070 | .procname = "bridge", | |
1071 | .mode = 0555, | |
1072 | .child = brnf_table, | |
1073 | }, | |
1074 | { .ctl_name = 0 } | |
1075 | }; | |
1076 | ||
1077 | static ctl_table brnf_net_table[] = { | |
1078 | { | |
1079 | .ctl_name = CTL_NET, | |
1080 | .procname = "net", | |
1081 | .mode = 0555, | |
1082 | .child = brnf_bridge_table, | |
1083 | }, | |
1084 | { .ctl_name = 0 } | |
1085 | }; | |
1086 | #endif | |
1087 | ||
1088 | int br_netfilter_init(void) | |
1089 | { | |
1090 | int i; | |
1091 | ||
1092 | for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) { | |
1093 | int ret; | |
1094 | ||
1095 | if ((ret = nf_register_hook(&br_nf_ops[i])) >= 0) | |
1096 | continue; | |
1097 | ||
1098 | while (i--) | |
1099 | nf_unregister_hook(&br_nf_ops[i]); | |
1100 | ||
1101 | return ret; | |
1102 | } | |
1103 | ||
1104 | #ifdef CONFIG_SYSCTL | |
1105 | brnf_sysctl_header = register_sysctl_table(brnf_net_table, 0); | |
1106 | if (brnf_sysctl_header == NULL) { | |
789bc3e5 SH |
1107 | printk(KERN_WARNING |
1108 | "br_netfilter: can't register to sysctl.\n"); | |
1da177e4 LT |
1109 | for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) |
1110 | nf_unregister_hook(&br_nf_ops[i]); | |
1111 | return -EFAULT; | |
1112 | } | |
1113 | #endif | |
1114 | ||
1115 | printk(KERN_NOTICE "Bridge firewalling registered\n"); | |
1116 | ||
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | void br_netfilter_fini(void) | |
1121 | { | |
1122 | int i; | |
1123 | ||
1124 | for (i = ARRAY_SIZE(br_nf_ops) - 1; i >= 0; i--) | |
1125 | nf_unregister_hook(&br_nf_ops[i]); | |
1126 | #ifdef CONFIG_SYSCTL | |
1127 | unregister_sysctl_table(brnf_sysctl_header); | |
1128 | #endif | |
1129 | } |