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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> | |
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 LT |
42 | #include <asm/uaccess.h> |
43 | #include <asm/checksum.h> | |
44 | #include "br_private.h" | |
45 | #ifdef CONFIG_SYSCTL | |
46 | #include <linux/sysctl.h> | |
47 | #endif | |
48 | ||
49 | #define skb_origaddr(skb) (((struct bridge_skb_cb *) \ | |
50 | (skb->nf_bridge->data))->daddr.ipv4) | |
51 | #define store_orig_dstaddr(skb) (skb_origaddr(skb) = (skb)->nh.iph->daddr) | |
52 | #define dnat_took_place(skb) (skb_origaddr(skb) != (skb)->nh.iph->daddr) | |
53 | ||
54 | #define has_bridge_parent(device) ((device)->br_port != NULL) | |
55 | #define bridge_parent(device) ((device)->br_port->br->dev) | |
56 | ||
57 | #ifdef CONFIG_SYSCTL | |
58 | static struct ctl_table_header *brnf_sysctl_header; | |
59 | static int brnf_call_iptables = 1; | |
60 | static int brnf_call_ip6tables = 1; | |
61 | static int brnf_call_arptables = 1; | |
62 | static int brnf_filter_vlan_tagged = 1; | |
63 | #else | |
64 | #define brnf_filter_vlan_tagged 1 | |
65 | #endif | |
66 | ||
67 | #define IS_VLAN_IP (skb->protocol == __constant_htons(ETH_P_8021Q) && \ | |
68 | hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_IP) && \ | |
69 | brnf_filter_vlan_tagged) | |
70 | #define IS_VLAN_IPV6 (skb->protocol == __constant_htons(ETH_P_8021Q) && \ | |
71 | hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_IPV6) && \ | |
72 | brnf_filter_vlan_tagged) | |
73 | #define IS_VLAN_ARP (skb->protocol == __constant_htons(ETH_P_8021Q) && \ | |
74 | hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_ARP) && \ | |
75 | brnf_filter_vlan_tagged) | |
76 | ||
77 | /* We need these fake structures to make netfilter happy -- | |
78 | * lots of places assume that skb->dst != NULL, which isn't | |
79 | * all that unreasonable. | |
80 | * | |
81 | * Currently, we fill in the PMTU entry because netfilter | |
82 | * refragmentation needs it, and the rt_flags entry because | |
83 | * ipt_REJECT needs it. Future netfilter modules might | |
84 | * require us to fill additional fields. */ | |
85 | static struct net_device __fake_net_device = { | |
86 | .hard_header_len = ETH_HLEN | |
87 | }; | |
88 | ||
89 | static struct rtable __fake_rtable = { | |
90 | .u = { | |
91 | .dst = { | |
92 | .__refcnt = ATOMIC_INIT(1), | |
93 | .dev = &__fake_net_device, | |
94 | .path = &__fake_rtable.u.dst, | |
95 | .metrics = {[RTAX_MTU - 1] = 1500}, | |
96 | } | |
97 | }, | |
98 | .rt_flags = 0, | |
99 | }; | |
100 | ||
101 | ||
102 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ | |
103 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
104 | * bridge PRE_ROUTING hook. */ | |
105 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
106 | { | |
107 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
108 | ||
1da177e4 LT |
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 | { | |
1da177e4 LT |
185 | if (skb->pkt_type == PACKET_OTHERHOST) { |
186 | skb->pkt_type = PACKET_HOST; | |
187 | skb->nf_bridge->mask |= BRNF_PKT_TYPE; | |
188 | } | |
189 | skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
190 | ||
191 | skb->dev = bridge_parent(skb->dev); | |
192 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { | |
193 | skb_pull(skb, VLAN_HLEN); | |
194 | skb->nh.raw += VLAN_HLEN; | |
195 | } | |
196 | skb->dst->output(skb); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static int br_nf_pre_routing_finish(struct sk_buff *skb) | |
201 | { | |
202 | struct net_device *dev = skb->dev; | |
203 | struct iphdr *iph = skb->nh.iph; | |
204 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
205 | ||
1da177e4 LT |
206 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
207 | skb->pkt_type = PACKET_OTHERHOST; | |
208 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
209 | } | |
210 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
211 | ||
212 | if (dnat_took_place(skb)) { | |
213 | if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, | |
214 | dev)) { | |
215 | struct rtable *rt; | |
216 | struct flowi fl = { .nl_u = | |
217 | { .ip4_u = { .daddr = iph->daddr, .saddr = 0 , | |
218 | .tos = RT_TOS(iph->tos)} }, .proto = 0}; | |
219 | ||
220 | if (!ip_route_output_key(&rt, &fl)) { | |
1c011bed BDS |
221 | /* - Bridged-and-DNAT'ed traffic doesn't |
222 | * require ip_forwarding. | |
223 | * - Deal with redirected traffic. */ | |
224 | if (((struct dst_entry *)rt)->dev == dev || | |
225 | rt->rt_type == RTN_LOCAL) { | |
1da177e4 LT |
226 | skb->dst = (struct dst_entry *)rt; |
227 | goto bridged_dnat; | |
228 | } | |
229 | __br_dnat_complain(); | |
230 | dst_release((struct dst_entry *)rt); | |
231 | } | |
232 | kfree_skb(skb); | |
233 | return 0; | |
234 | } else { | |
235 | if (skb->dst->dev == dev) { | |
236 | bridged_dnat: | |
237 | /* Tell br_nf_local_out this is a | |
238 | * bridged frame */ | |
239 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
240 | skb->dev = nf_bridge->physindev; | |
241 | if (skb->protocol == | |
242 | __constant_htons(ETH_P_8021Q)) { | |
243 | skb_push(skb, VLAN_HLEN); | |
244 | skb->nh.raw -= VLAN_HLEN; | |
245 | } | |
246 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, | |
247 | skb, skb->dev, NULL, | |
248 | br_nf_pre_routing_finish_bridge, | |
249 | 1); | |
250 | return 0; | |
251 | } | |
252 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, | |
253 | ETH_ALEN); | |
254 | skb->pkt_type = PACKET_HOST; | |
255 | } | |
256 | } else { | |
257 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
258 | dst_hold(skb->dst); | |
259 | } | |
260 | ||
261 | skb->dev = nf_bridge->physindev; | |
262 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { | |
263 | skb_push(skb, VLAN_HLEN); | |
264 | skb->nh.raw -= VLAN_HLEN; | |
265 | } | |
266 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
267 | br_handle_frame_finish, 1); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | /* Some common code for IPv4/IPv6 */ | |
273 | static void setup_pre_routing(struct sk_buff *skb) | |
274 | { | |
275 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
276 | ||
277 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
278 | skb->pkt_type = PACKET_HOST; | |
279 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
280 | } | |
281 | ||
282 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
283 | nf_bridge->physindev = skb->dev; | |
284 | skb->dev = bridge_parent(skb->dev); | |
285 | } | |
286 | ||
287 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
288 | static int check_hbh_len(struct sk_buff *skb) | |
289 | { | |
290 | unsigned char *raw = (u8*)(skb->nh.ipv6h+1); | |
291 | u32 pkt_len; | |
292 | int off = raw - skb->nh.raw; | |
293 | int len = (raw[1]+1)<<3; | |
294 | ||
295 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
296 | goto bad; | |
297 | ||
298 | off += 2; | |
299 | len -= 2; | |
300 | ||
301 | while (len > 0) { | |
b0366486 | 302 | int optlen = skb->nh.raw[off+1]+2; |
1da177e4 LT |
303 | |
304 | switch (skb->nh.raw[off]) { | |
305 | case IPV6_TLV_PAD0: | |
306 | optlen = 1; | |
307 | break; | |
308 | ||
309 | case IPV6_TLV_PADN: | |
310 | break; | |
311 | ||
312 | case IPV6_TLV_JUMBO: | |
313 | if (skb->nh.raw[off+1] != 4 || (off&3) != 2) | |
314 | goto bad; | |
1da177e4 | 315 | pkt_len = ntohl(*(u32*)(skb->nh.raw+off+2)); |
b0366486 BDS |
316 | if (pkt_len <= IPV6_MAXPLEN || |
317 | skb->nh.ipv6h->payload_len) | |
318 | goto bad; | |
1da177e4 LT |
319 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
320 | goto bad; | |
b0366486 BDS |
321 | if (pskb_trim_rcsum(skb, |
322 | pkt_len+sizeof(struct ipv6hdr))) | |
323 | goto bad; | |
1da177e4 LT |
324 | break; |
325 | default: | |
326 | if (optlen > len) | |
327 | goto bad; | |
328 | break; | |
329 | } | |
330 | off += optlen; | |
331 | len -= optlen; | |
332 | } | |
333 | if (len == 0) | |
334 | return 0; | |
335 | bad: | |
336 | return -1; | |
337 | ||
338 | } | |
339 | ||
340 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
341 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
342 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
343 | struct sk_buff *skb, const struct net_device *in, | |
344 | const struct net_device *out, int (*okfn)(struct sk_buff *)) | |
345 | { | |
346 | struct ipv6hdr *hdr; | |
347 | u32 pkt_len; | |
348 | struct nf_bridge_info *nf_bridge; | |
349 | ||
350 | if (skb->len < sizeof(struct ipv6hdr)) | |
351 | goto inhdr_error; | |
352 | ||
353 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
354 | goto inhdr_error; | |
355 | ||
356 | hdr = skb->nh.ipv6h; | |
357 | ||
358 | if (hdr->version != 6) | |
359 | goto inhdr_error; | |
360 | ||
361 | pkt_len = ntohs(hdr->payload_len); | |
362 | ||
363 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
364 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
365 | goto inhdr_error; | |
366 | if (pkt_len + sizeof(struct ipv6hdr) < skb->len) { | |
367 | if (__pskb_trim(skb, pkt_len + sizeof(struct ipv6hdr))) | |
368 | goto inhdr_error; | |
369 | if (skb->ip_summed == CHECKSUM_HW) | |
370 | skb->ip_summed = CHECKSUM_NONE; | |
371 | } | |
372 | } | |
373 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
374 | goto inhdr_error; | |
375 | ||
79cac2a2 | 376 | nf_bridge_put(skb->nf_bridge); |
1da177e4 LT |
377 | if ((nf_bridge = nf_bridge_alloc(skb)) == NULL) |
378 | return NF_DROP; | |
379 | setup_pre_routing(skb); | |
380 | ||
381 | NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL, | |
382 | br_nf_pre_routing_finish_ipv6); | |
383 | ||
384 | return NF_STOLEN; | |
385 | ||
386 | inhdr_error: | |
387 | return NF_DROP; | |
388 | } | |
389 | ||
390 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
391 | * Replicate the checks that IPv4 does on packet reception. | |
392 | * Set skb->dev to the bridge device (i.e. parent of the | |
393 | * receiving device) to make netfilter happy, the REDIRECT | |
394 | * target in particular. Save the original destination IP | |
395 | * address to be able to detect DNAT afterwards. */ | |
396 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, | |
397 | const struct net_device *in, const struct net_device *out, | |
398 | int (*okfn)(struct sk_buff *)) | |
399 | { | |
400 | struct iphdr *iph; | |
401 | __u32 len; | |
402 | struct sk_buff *skb = *pskb; | |
403 | struct nf_bridge_info *nf_bridge; | |
404 | struct vlan_ethhdr *hdr = vlan_eth_hdr(*pskb); | |
405 | ||
406 | if (skb->protocol == __constant_htons(ETH_P_IPV6) || IS_VLAN_IPV6) { | |
407 | #ifdef CONFIG_SYSCTL | |
408 | if (!brnf_call_ip6tables) | |
409 | return NF_ACCEPT; | |
410 | #endif | |
411 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
412 | goto out; | |
413 | ||
414 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { | |
415 | skb_pull(skb, VLAN_HLEN); | |
416 | (skb)->nh.raw += VLAN_HLEN; | |
417 | } | |
418 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); | |
419 | } | |
420 | #ifdef CONFIG_SYSCTL | |
421 | if (!brnf_call_iptables) | |
422 | return NF_ACCEPT; | |
423 | #endif | |
424 | ||
425 | if (skb->protocol != __constant_htons(ETH_P_IP) && !IS_VLAN_IP) | |
426 | return NF_ACCEPT; | |
427 | ||
428 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
429 | goto out; | |
430 | ||
431 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { | |
432 | skb_pull(skb, VLAN_HLEN); | |
433 | (skb)->nh.raw += VLAN_HLEN; | |
434 | } | |
435 | ||
436 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
437 | goto inhdr_error; | |
438 | ||
439 | iph = skb->nh.iph; | |
440 | if (iph->ihl < 5 || iph->version != 4) | |
441 | goto inhdr_error; | |
442 | ||
443 | if (!pskb_may_pull(skb, 4*iph->ihl)) | |
444 | goto inhdr_error; | |
445 | ||
446 | iph = skb->nh.iph; | |
447 | if (ip_fast_csum((__u8 *)iph, iph->ihl) != 0) | |
448 | goto inhdr_error; | |
449 | ||
450 | len = ntohs(iph->tot_len); | |
451 | if (skb->len < len || len < 4*iph->ihl) | |
452 | goto inhdr_error; | |
453 | ||
454 | if (skb->len > len) { | |
455 | __pskb_trim(skb, len); | |
456 | if (skb->ip_summed == CHECKSUM_HW) | |
457 | skb->ip_summed = CHECKSUM_NONE; | |
458 | } | |
459 | ||
79cac2a2 | 460 | nf_bridge_put(skb->nf_bridge); |
1da177e4 LT |
461 | if ((nf_bridge = nf_bridge_alloc(skb)) == NULL) |
462 | return NF_DROP; | |
463 | setup_pre_routing(skb); | |
464 | store_orig_dstaddr(skb); | |
465 | ||
466 | NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL, | |
467 | br_nf_pre_routing_finish); | |
468 | ||
469 | return NF_STOLEN; | |
470 | ||
471 | inhdr_error: | |
472 | // IP_INC_STATS_BH(IpInHdrErrors); | |
473 | out: | |
474 | return NF_DROP; | |
475 | } | |
476 | ||
477 | ||
478 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
479 | /* The packet is locally destined, which requires a real | |
480 | * dst_entry, so detach the fake one. On the way up, the | |
481 | * packet would pass through PRE_ROUTING again (which already | |
482 | * took place when the packet entered the bridge), but we | |
483 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
484 | * prevent this from happening. */ | |
485 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb, | |
486 | const struct net_device *in, const struct net_device *out, | |
487 | int (*okfn)(struct sk_buff *)) | |
488 | { | |
489 | struct sk_buff *skb = *pskb; | |
490 | ||
491 | if (skb->dst == (struct dst_entry *)&__fake_rtable) { | |
492 | dst_release(skb->dst); | |
493 | skb->dst = NULL; | |
494 | } | |
495 | ||
496 | return NF_ACCEPT; | |
497 | } | |
498 | ||
499 | ||
500 | /* PF_BRIDGE/FORWARD *************************************************/ | |
501 | static int br_nf_forward_finish(struct sk_buff *skb) | |
502 | { | |
503 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
504 | struct net_device *in; | |
505 | struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); | |
506 | ||
1da177e4 LT |
507 | if (skb->protocol != __constant_htons(ETH_P_ARP) && !IS_VLAN_ARP) { |
508 | in = nf_bridge->physindev; | |
509 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
510 | skb->pkt_type = PACKET_OTHERHOST; | |
511 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
512 | } | |
513 | } else { | |
514 | in = *((struct net_device **)(skb->cb)); | |
515 | } | |
516 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { | |
517 | skb_push(skb, VLAN_HLEN); | |
518 | skb->nh.raw -= VLAN_HLEN; | |
519 | } | |
520 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, | |
521 | skb->dev, br_forward_finish, 1); | |
522 | return 0; | |
523 | } | |
524 | ||
525 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
526 | * netfilter with indev and outdev set to the bridge device, | |
527 | * but we are still able to filter on the 'real' indev/outdev | |
528 | * because of the physdev module. For ARP, indev and outdev are the | |
529 | * bridge ports. */ | |
530 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb, | |
531 | const struct net_device *in, const struct net_device *out, | |
532 | int (*okfn)(struct sk_buff *)) | |
533 | { | |
534 | struct sk_buff *skb = *pskb; | |
535 | struct nf_bridge_info *nf_bridge; | |
536 | struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); | |
537 | int pf; | |
538 | ||
539 | if (!skb->nf_bridge) | |
540 | return NF_ACCEPT; | |
541 | ||
542 | if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP) | |
543 | pf = PF_INET; | |
544 | else | |
545 | pf = PF_INET6; | |
546 | ||
547 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { | |
548 | skb_pull(*pskb, VLAN_HLEN); | |
549 | (*pskb)->nh.raw += VLAN_HLEN; | |
550 | } | |
551 | ||
1da177e4 LT |
552 | nf_bridge = skb->nf_bridge; |
553 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
554 | skb->pkt_type = PACKET_HOST; | |
555 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
556 | } | |
557 | ||
558 | /* The physdev module checks on this */ | |
559 | nf_bridge->mask |= BRNF_BRIDGED; | |
560 | nf_bridge->physoutdev = skb->dev; | |
561 | ||
562 | NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), | |
563 | bridge_parent(out), br_nf_forward_finish); | |
564 | ||
565 | return NF_STOLEN; | |
566 | } | |
567 | ||
568 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb, | |
569 | const struct net_device *in, const struct net_device *out, | |
570 | int (*okfn)(struct sk_buff *)) | |
571 | { | |
572 | struct sk_buff *skb = *pskb; | |
573 | struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); | |
574 | struct net_device **d = (struct net_device **)(skb->cb); | |
575 | ||
576 | #ifdef CONFIG_SYSCTL | |
577 | if (!brnf_call_arptables) | |
578 | return NF_ACCEPT; | |
579 | #endif | |
580 | ||
581 | if (skb->protocol != __constant_htons(ETH_P_ARP)) { | |
582 | if (!IS_VLAN_ARP) | |
583 | return NF_ACCEPT; | |
584 | skb_pull(*pskb, VLAN_HLEN); | |
585 | (*pskb)->nh.raw += VLAN_HLEN; | |
586 | } | |
587 | ||
1da177e4 LT |
588 | if (skb->nh.arph->ar_pln != 4) { |
589 | if (IS_VLAN_ARP) { | |
590 | skb_push(*pskb, VLAN_HLEN); | |
591 | (*pskb)->nh.raw -= VLAN_HLEN; | |
592 | } | |
593 | return NF_ACCEPT; | |
594 | } | |
595 | *d = (struct net_device *)in; | |
596 | NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, | |
597 | (struct net_device *)out, br_nf_forward_finish); | |
598 | ||
599 | return NF_STOLEN; | |
600 | } | |
601 | ||
602 | ||
603 | /* PF_BRIDGE/LOCAL_OUT ***********************************************/ | |
604 | static int br_nf_local_out_finish(struct sk_buff *skb) | |
605 | { | |
1da177e4 LT |
606 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { |
607 | skb_push(skb, VLAN_HLEN); | |
608 | skb->nh.raw -= VLAN_HLEN; | |
609 | } | |
610 | ||
611 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, | |
612 | br_forward_finish, NF_BR_PRI_FIRST + 1); | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | /* This function sees both locally originated IP packets and forwarded | |
618 | * IP packets (in both cases the destination device is a bridge | |
619 | * device). It also sees bridged-and-DNAT'ed packets. | |
620 | * To be able to filter on the physical bridge devices (with the physdev | |
621 | * module), we steal packets destined to a bridge device away from the | |
622 | * PF_INET/FORWARD and PF_INET/OUTPUT hook functions, and give them back later, | |
623 | * when we have determined the real output device. This is done in here. | |
624 | * | |
625 | * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged | |
626 | * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() | |
627 | * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority | |
628 | * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor | |
629 | * will be executed. | |
630 | * Otherwise, if nf_bridge->physindev is NULL, the bridge-nf code never touched | |
631 | * this packet before, and so the packet was locally originated. We fake | |
632 | * the PF_INET/LOCAL_OUT hook. | |
633 | * Finally, if nf_bridge->physindev isn't NULL, then the packet was IP routed, | |
634 | * so we fake the PF_INET/FORWARD hook. ip_sabotage_out() makes sure | |
635 | * even routed packets that didn't arrive on a bridge interface have their | |
636 | * nf_bridge->physindev set. */ | |
637 | static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb, | |
638 | const struct net_device *in, const struct net_device *out, | |
639 | int (*okfn)(struct sk_buff *)) | |
640 | { | |
641 | struct net_device *realindev, *realoutdev; | |
642 | struct sk_buff *skb = *pskb; | |
643 | struct nf_bridge_info *nf_bridge; | |
644 | struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); | |
645 | int pf; | |
646 | ||
647 | if (!skb->nf_bridge) | |
648 | return NF_ACCEPT; | |
649 | ||
650 | if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP) | |
651 | pf = PF_INET; | |
652 | else | |
653 | pf = PF_INET6; | |
654 | ||
655 | #ifdef CONFIG_NETFILTER_DEBUG | |
656 | /* Sometimes we get packets with NULL ->dst here (for example, | |
657 | * running a dhcp client daemon triggers this). This should now | |
658 | * be fixed, but let's keep the check around. */ | |
659 | if (skb->dst == NULL) { | |
660 | printk(KERN_CRIT "br_netfilter: skb->dst == NULL."); | |
661 | return NF_ACCEPT; | |
662 | } | |
663 | #endif | |
664 | ||
665 | nf_bridge = skb->nf_bridge; | |
666 | nf_bridge->physoutdev = skb->dev; | |
667 | realindev = nf_bridge->physindev; | |
668 | ||
669 | /* Bridged, take PF_BRIDGE/FORWARD. | |
670 | * (see big note in front of br_nf_pre_routing_finish) */ | |
671 | if (nf_bridge->mask & BRNF_BRIDGED_DNAT) { | |
672 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
673 | skb->pkt_type = PACKET_OTHERHOST; | |
674 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
675 | } | |
676 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { | |
677 | skb_push(skb, VLAN_HLEN); | |
678 | skb->nh.raw -= VLAN_HLEN; | |
679 | } | |
680 | ||
681 | NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, | |
682 | skb->dev, br_forward_finish); | |
683 | goto out; | |
684 | } | |
685 | realoutdev = bridge_parent(skb->dev); | |
686 | ||
687 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
688 | /* iptables should match -o br0.x */ | |
689 | if (nf_bridge->netoutdev) | |
690 | realoutdev = nf_bridge->netoutdev; | |
691 | #endif | |
692 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { | |
693 | skb_pull(skb, VLAN_HLEN); | |
694 | (*pskb)->nh.raw += VLAN_HLEN; | |
695 | } | |
696 | /* IP forwarded traffic has a physindev, locally | |
697 | * generated traffic hasn't. */ | |
698 | if (realindev != NULL) { | |
699 | if (!(nf_bridge->mask & BRNF_DONT_TAKE_PARENT) && | |
700 | has_bridge_parent(realindev)) | |
701 | realindev = bridge_parent(realindev); | |
702 | ||
703 | NF_HOOK_THRESH(pf, NF_IP_FORWARD, skb, realindev, | |
704 | realoutdev, br_nf_local_out_finish, | |
705 | NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD + 1); | |
706 | } else { | |
1da177e4 LT |
707 | NF_HOOK_THRESH(pf, NF_IP_LOCAL_OUT, skb, realindev, |
708 | realoutdev, br_nf_local_out_finish, | |
709 | NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1); | |
710 | } | |
711 | ||
712 | out: | |
713 | return NF_STOLEN; | |
714 | } | |
715 | ||
716 | ||
717 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
718 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb, | |
719 | const struct net_device *in, const struct net_device *out, | |
720 | int (*okfn)(struct sk_buff *)) | |
721 | { | |
722 | struct sk_buff *skb = *pskb; | |
723 | struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge; | |
724 | struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); | |
725 | struct net_device *realoutdev = bridge_parent(skb->dev); | |
726 | int pf; | |
727 | ||
728 | #ifdef CONFIG_NETFILTER_DEBUG | |
729 | /* Be very paranoid. This probably won't happen anymore, but let's | |
730 | * keep the check just to be sure... */ | |
731 | if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) { | |
732 | printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: " | |
733 | "bad mac.raw pointer."); | |
734 | goto print_error; | |
735 | } | |
736 | #endif | |
737 | ||
738 | if (!nf_bridge) | |
739 | return NF_ACCEPT; | |
740 | ||
741 | if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP) | |
742 | pf = PF_INET; | |
743 | else | |
744 | pf = PF_INET6; | |
745 | ||
746 | #ifdef CONFIG_NETFILTER_DEBUG | |
747 | if (skb->dst == NULL) { | |
748 | printk(KERN_CRIT "br_netfilter: skb->dst == NULL."); | |
749 | goto print_error; | |
750 | } | |
1da177e4 LT |
751 | #endif |
752 | ||
753 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
754 | * about the value of skb->pkt_type. */ | |
755 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
756 | skb->pkt_type = PACKET_HOST; | |
757 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
758 | } | |
759 | ||
760 | if (skb->protocol == __constant_htons(ETH_P_8021Q)) { | |
761 | skb_pull(skb, VLAN_HLEN); | |
762 | skb->nh.raw += VLAN_HLEN; | |
763 | } | |
764 | ||
765 | nf_bridge_save_header(skb); | |
766 | ||
767 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
768 | if (nf_bridge->netoutdev) | |
769 | realoutdev = nf_bridge->netoutdev; | |
770 | #endif | |
771 | NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev, | |
772 | br_dev_queue_push_xmit); | |
773 | ||
774 | return NF_STOLEN; | |
775 | ||
776 | #ifdef CONFIG_NETFILTER_DEBUG | |
777 | print_error: | |
778 | if (skb->dev != NULL) { | |
779 | printk("[%s]", skb->dev->name); | |
780 | if (has_bridge_parent(skb->dev)) | |
781 | printk("[%s]", bridge_parent(skb->dev)->name); | |
782 | } | |
783 | printk(" head:%p, raw:%p, data:%p\n", skb->head, skb->mac.raw, | |
784 | skb->data); | |
785 | return NF_ACCEPT; | |
786 | #endif | |
787 | } | |
788 | ||
789 | ||
790 | /* IP/SABOTAGE *****************************************************/ | |
791 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
792 | * for the second time. */ | |
793 | static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff **pskb, | |
794 | const struct net_device *in, const struct net_device *out, | |
795 | int (*okfn)(struct sk_buff *)) | |
796 | { | |
797 | if ((*pskb)->nf_bridge && | |
798 | !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
799 | return NF_STOP; | |
800 | } | |
801 | ||
802 | return NF_ACCEPT; | |
803 | } | |
804 | ||
805 | /* Postpone execution of PF_INET(6)/FORWARD, PF_INET(6)/LOCAL_OUT | |
806 | * and PF_INET(6)/POST_ROUTING until we have done the forwarding | |
807 | * decision in the bridge code and have determined nf_bridge->physoutdev. */ | |
808 | static unsigned int ip_sabotage_out(unsigned int hook, struct sk_buff **pskb, | |
809 | const struct net_device *in, const struct net_device *out, | |
810 | int (*okfn)(struct sk_buff *)) | |
811 | { | |
812 | struct sk_buff *skb = *pskb; | |
813 | ||
814 | if ((out->hard_start_xmit == br_dev_xmit && | |
815 | okfn != br_nf_forward_finish && | |
816 | okfn != br_nf_local_out_finish && | |
817 | okfn != br_dev_queue_push_xmit) | |
818 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
819 | || ((out->priv_flags & IFF_802_1Q_VLAN) && | |
820 | VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit) | |
821 | #endif | |
822 | ) { | |
823 | struct nf_bridge_info *nf_bridge; | |
824 | ||
825 | if (!skb->nf_bridge) { | |
826 | #ifdef CONFIG_SYSCTL | |
827 | /* This code is executed while in the IP(v6) stack, | |
828 | the version should be 4 or 6. We can't use | |
829 | skb->protocol because that isn't set on | |
830 | PF_INET(6)/LOCAL_OUT. */ | |
831 | struct iphdr *ip = skb->nh.iph; | |
832 | ||
833 | if (ip->version == 4 && !brnf_call_iptables) | |
834 | return NF_ACCEPT; | |
835 | else if (ip->version == 6 && !brnf_call_ip6tables) | |
836 | return NF_ACCEPT; | |
837 | #endif | |
838 | if (hook == NF_IP_POST_ROUTING) | |
839 | return NF_ACCEPT; | |
840 | if (!nf_bridge_alloc(skb)) | |
841 | return NF_DROP; | |
842 | } | |
843 | ||
844 | nf_bridge = skb->nf_bridge; | |
845 | ||
846 | /* This frame will arrive on PF_BRIDGE/LOCAL_OUT and we | |
847 | * will need the indev then. For a brouter, the real indev | |
848 | * can be a bridge port, so we make sure br_nf_local_out() | |
849 | * doesn't use the bridge parent of the indev by using | |
850 | * the BRNF_DONT_TAKE_PARENT mask. */ | |
851 | if (hook == NF_IP_FORWARD && nf_bridge->physindev == NULL) { | |
9666dae5 | 852 | nf_bridge->mask |= BRNF_DONT_TAKE_PARENT; |
1da177e4 LT |
853 | nf_bridge->physindev = (struct net_device *)in; |
854 | } | |
855 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
856 | /* the iptables outdev is br0.x, not br0 */ | |
857 | if (out->priv_flags & IFF_802_1Q_VLAN) | |
858 | nf_bridge->netoutdev = (struct net_device *)out; | |
859 | #endif | |
860 | return NF_STOP; | |
861 | } | |
862 | ||
863 | return NF_ACCEPT; | |
864 | } | |
865 | ||
866 | /* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent | |
867 | * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. | |
868 | * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
869 | * ip_refrag() can return NF_STOLEN. */ | |
870 | static struct nf_hook_ops br_nf_ops[] = { | |
871 | { .hook = br_nf_pre_routing, | |
872 | .owner = THIS_MODULE, | |
873 | .pf = PF_BRIDGE, | |
874 | .hooknum = NF_BR_PRE_ROUTING, | |
875 | .priority = NF_BR_PRI_BRNF, }, | |
876 | { .hook = br_nf_local_in, | |
877 | .owner = THIS_MODULE, | |
878 | .pf = PF_BRIDGE, | |
879 | .hooknum = NF_BR_LOCAL_IN, | |
880 | .priority = NF_BR_PRI_BRNF, }, | |
881 | { .hook = br_nf_forward_ip, | |
882 | .owner = THIS_MODULE, | |
883 | .pf = PF_BRIDGE, | |
884 | .hooknum = NF_BR_FORWARD, | |
885 | .priority = NF_BR_PRI_BRNF - 1, }, | |
886 | { .hook = br_nf_forward_arp, | |
887 | .owner = THIS_MODULE, | |
888 | .pf = PF_BRIDGE, | |
889 | .hooknum = NF_BR_FORWARD, | |
890 | .priority = NF_BR_PRI_BRNF, }, | |
891 | { .hook = br_nf_local_out, | |
892 | .owner = THIS_MODULE, | |
893 | .pf = PF_BRIDGE, | |
894 | .hooknum = NF_BR_LOCAL_OUT, | |
895 | .priority = NF_BR_PRI_FIRST, }, | |
896 | { .hook = br_nf_post_routing, | |
897 | .owner = THIS_MODULE, | |
898 | .pf = PF_BRIDGE, | |
899 | .hooknum = NF_BR_POST_ROUTING, | |
900 | .priority = NF_BR_PRI_LAST, }, | |
901 | { .hook = ip_sabotage_in, | |
902 | .owner = THIS_MODULE, | |
903 | .pf = PF_INET, | |
904 | .hooknum = NF_IP_PRE_ROUTING, | |
905 | .priority = NF_IP_PRI_FIRST, }, | |
906 | { .hook = ip_sabotage_in, | |
907 | .owner = THIS_MODULE, | |
908 | .pf = PF_INET6, | |
909 | .hooknum = NF_IP6_PRE_ROUTING, | |
910 | .priority = NF_IP6_PRI_FIRST, }, | |
911 | { .hook = ip_sabotage_out, | |
912 | .owner = THIS_MODULE, | |
913 | .pf = PF_INET, | |
914 | .hooknum = NF_IP_FORWARD, | |
915 | .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, }, | |
916 | { .hook = ip_sabotage_out, | |
917 | .owner = THIS_MODULE, | |
918 | .pf = PF_INET6, | |
919 | .hooknum = NF_IP6_FORWARD, | |
920 | .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_FORWARD, }, | |
921 | { .hook = ip_sabotage_out, | |
922 | .owner = THIS_MODULE, | |
923 | .pf = PF_INET, | |
924 | .hooknum = NF_IP_LOCAL_OUT, | |
925 | .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, }, | |
926 | { .hook = ip_sabotage_out, | |
927 | .owner = THIS_MODULE, | |
928 | .pf = PF_INET6, | |
929 | .hooknum = NF_IP6_LOCAL_OUT, | |
930 | .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, }, | |
931 | { .hook = ip_sabotage_out, | |
932 | .owner = THIS_MODULE, | |
933 | .pf = PF_INET, | |
934 | .hooknum = NF_IP_POST_ROUTING, | |
935 | .priority = NF_IP_PRI_FIRST, }, | |
936 | { .hook = ip_sabotage_out, | |
937 | .owner = THIS_MODULE, | |
938 | .pf = PF_INET6, | |
939 | .hooknum = NF_IP6_POST_ROUTING, | |
940 | .priority = NF_IP6_PRI_FIRST, }, | |
941 | }; | |
942 | ||
943 | #ifdef CONFIG_SYSCTL | |
944 | static | |
945 | int brnf_sysctl_call_tables(ctl_table *ctl, int write, struct file * filp, | |
946 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
947 | { | |
948 | int ret; | |
949 | ||
950 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
951 | ||
952 | if (write && *(int *)(ctl->data)) | |
953 | *(int *)(ctl->data) = 1; | |
954 | return ret; | |
955 | } | |
956 | ||
957 | static ctl_table brnf_table[] = { | |
958 | { | |
959 | .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES, | |
960 | .procname = "bridge-nf-call-arptables", | |
961 | .data = &brnf_call_arptables, | |
962 | .maxlen = sizeof(int), | |
963 | .mode = 0644, | |
964 | .proc_handler = &brnf_sysctl_call_tables, | |
965 | }, | |
966 | { | |
967 | .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES, | |
968 | .procname = "bridge-nf-call-iptables", | |
969 | .data = &brnf_call_iptables, | |
970 | .maxlen = sizeof(int), | |
971 | .mode = 0644, | |
972 | .proc_handler = &brnf_sysctl_call_tables, | |
973 | }, | |
974 | { | |
975 | .ctl_name = NET_BRIDGE_NF_CALL_IP6TABLES, | |
976 | .procname = "bridge-nf-call-ip6tables", | |
977 | .data = &brnf_call_ip6tables, | |
978 | .maxlen = sizeof(int), | |
979 | .mode = 0644, | |
980 | .proc_handler = &brnf_sysctl_call_tables, | |
981 | }, | |
982 | { | |
983 | .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED, | |
984 | .procname = "bridge-nf-filter-vlan-tagged", | |
985 | .data = &brnf_filter_vlan_tagged, | |
986 | .maxlen = sizeof(int), | |
987 | .mode = 0644, | |
988 | .proc_handler = &brnf_sysctl_call_tables, | |
989 | }, | |
990 | { .ctl_name = 0 } | |
991 | }; | |
992 | ||
993 | static ctl_table brnf_bridge_table[] = { | |
994 | { | |
995 | .ctl_name = NET_BRIDGE, | |
996 | .procname = "bridge", | |
997 | .mode = 0555, | |
998 | .child = brnf_table, | |
999 | }, | |
1000 | { .ctl_name = 0 } | |
1001 | }; | |
1002 | ||
1003 | static ctl_table brnf_net_table[] = { | |
1004 | { | |
1005 | .ctl_name = CTL_NET, | |
1006 | .procname = "net", | |
1007 | .mode = 0555, | |
1008 | .child = brnf_bridge_table, | |
1009 | }, | |
1010 | { .ctl_name = 0 } | |
1011 | }; | |
1012 | #endif | |
1013 | ||
1014 | int br_netfilter_init(void) | |
1015 | { | |
1016 | int i; | |
1017 | ||
1018 | for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) { | |
1019 | int ret; | |
1020 | ||
1021 | if ((ret = nf_register_hook(&br_nf_ops[i])) >= 0) | |
1022 | continue; | |
1023 | ||
1024 | while (i--) | |
1025 | nf_unregister_hook(&br_nf_ops[i]); | |
1026 | ||
1027 | return ret; | |
1028 | } | |
1029 | ||
1030 | #ifdef CONFIG_SYSCTL | |
1031 | brnf_sysctl_header = register_sysctl_table(brnf_net_table, 0); | |
1032 | if (brnf_sysctl_header == NULL) { | |
1033 | printk(KERN_WARNING "br_netfilter: can't register to sysctl.\n"); | |
1034 | for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) | |
1035 | nf_unregister_hook(&br_nf_ops[i]); | |
1036 | return -EFAULT; | |
1037 | } | |
1038 | #endif | |
1039 | ||
1040 | printk(KERN_NOTICE "Bridge firewalling registered\n"); | |
1041 | ||
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | void br_netfilter_fini(void) | |
1046 | { | |
1047 | int i; | |
1048 | ||
1049 | for (i = ARRAY_SIZE(br_nf_ops) - 1; i >= 0; i--) | |
1050 | nf_unregister_hook(&br_nf_ops[i]); | |
1051 | #ifdef CONFIG_SYSCTL | |
1052 | unregister_sysctl_table(brnf_sysctl_header); | |
1053 | #endif | |
1054 | } |