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