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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * Bart De Schuymer (maintainer) <bdschuym@pandora.be> | |
8 | * | |
9 | * Changes: | |
10 | * Apr 29 2003: physdev module support (bdschuym) | |
11 | * Jun 19 2003: let arptables see bridged ARP traffic (bdschuym) | |
12 | * Oct 06 2003: filter encapsulated IP/ARP VLAN traffic on untagged bridge | |
13 | * (bdschuym) | |
14 | * Sep 01 2004: add IPv6 filtering (bdschuym) | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | * | |
21 | * Lennert dedicates this file to Kerstin Wurdinger. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/ip.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/skbuff.h> | |
14c85021 | 29 | #include <linux/if_arp.h> |
1da177e4 LT |
30 | #include <linux/if_ether.h> |
31 | #include <linux/if_vlan.h> | |
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 | ||
1da177e4 LT |
54 | #ifdef CONFIG_SYSCTL |
55 | static struct ctl_table_header *brnf_sysctl_header; | |
56 | static int brnf_call_iptables = 1; | |
57 | static int brnf_call_ip6tables = 1; | |
58 | static int brnf_call_arptables = 1; | |
59 | static int brnf_filter_vlan_tagged = 1; | |
60 | #else | |
61 | #define brnf_filter_vlan_tagged 1 | |
62 | #endif | |
63 | ||
f8a26028 SH |
64 | #define IS_VLAN_IP (skb->protocol == htons(ETH_P_8021Q) && \ |
65 | hdr->h_vlan_encapsulated_proto == htons(ETH_P_IP) && \ | |
1da177e4 | 66 | brnf_filter_vlan_tagged) |
f8a26028 SH |
67 | #define IS_VLAN_IPV6 (skb->protocol == htons(ETH_P_8021Q) && \ |
68 | hdr->h_vlan_encapsulated_proto == htons(ETH_P_IPV6) && \ | |
1da177e4 | 69 | brnf_filter_vlan_tagged) |
f8a26028 SH |
70 | #define IS_VLAN_ARP (skb->protocol == htons(ETH_P_8021Q) && \ |
71 | hdr->h_vlan_encapsulated_proto == htons(ETH_P_ARP) && \ | |
1da177e4 LT |
72 | brnf_filter_vlan_tagged) |
73 | ||
74 | /* We need these fake structures to make netfilter happy -- | |
75 | * lots of places assume that skb->dst != NULL, which isn't | |
76 | * all that unreasonable. | |
77 | * | |
78 | * Currently, we fill in the PMTU entry because netfilter | |
79 | * refragmentation needs it, and the rt_flags entry because | |
80 | * ipt_REJECT needs it. Future netfilter modules might | |
81 | * require us to fill additional fields. */ | |
82 | static struct net_device __fake_net_device = { | |
83 | .hard_header_len = ETH_HLEN | |
84 | }; | |
85 | ||
86 | static struct rtable __fake_rtable = { | |
87 | .u = { | |
88 | .dst = { | |
89 | .__refcnt = ATOMIC_INIT(1), | |
90 | .dev = &__fake_net_device, | |
91 | .path = &__fake_rtable.u.dst, | |
92 | .metrics = {[RTAX_MTU - 1] = 1500}, | |
42cf93cd | 93 | .flags = DST_NOXFRM, |
1da177e4 LT |
94 | } |
95 | }, | |
96 | .rt_flags = 0, | |
97 | }; | |
98 | ||
5dce971a SH |
99 | static inline struct net_device *bridge_parent(const struct net_device *dev) |
100 | { | |
101 | struct net_bridge_port *port = rcu_dereference(dev->br_port); | |
102 | ||
103 | return port ? port->br->dev : NULL; | |
104 | } | |
1da177e4 LT |
105 | |
106 | /* PF_BRIDGE/PRE_ROUTING *********************************************/ | |
107 | /* Undo the changes made for ip6tables PREROUTING and continue the | |
108 | * bridge PRE_ROUTING hook. */ | |
109 | static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb) | |
110 | { | |
111 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
112 | ||
1da177e4 LT |
113 | if (nf_bridge->mask & BRNF_PKT_TYPE) { |
114 | skb->pkt_type = PACKET_OTHERHOST; | |
115 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
116 | } | |
117 | nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING; | |
118 | ||
119 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
120 | dst_hold(skb->dst); | |
121 | ||
122 | skb->dev = nf_bridge->physindev; | |
f8a26028 | 123 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
124 | skb_push(skb, VLAN_HLEN); |
125 | skb->nh.raw -= VLAN_HLEN; | |
126 | } | |
127 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
128 | br_handle_frame_finish, 1); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | static void __br_dnat_complain(void) | |
134 | { | |
135 | static unsigned long last_complaint; | |
136 | ||
137 | if (jiffies - last_complaint >= 5 * HZ) { | |
138 | printk(KERN_WARNING "Performing cross-bridge DNAT requires IP " | |
789bc3e5 | 139 | "forwarding to be enabled\n"); |
1da177e4 LT |
140 | last_complaint = jiffies; |
141 | } | |
142 | } | |
143 | ||
144 | /* This requires some explaining. If DNAT has taken place, | |
145 | * we will need to fix up the destination Ethernet address, | |
146 | * and this is a tricky process. | |
147 | * | |
148 | * There are two cases to consider: | |
149 | * 1. The packet was DNAT'ed to a device in the same bridge | |
150 | * port group as it was received on. We can still bridge | |
151 | * the packet. | |
152 | * 2. The packet was DNAT'ed to a different device, either | |
153 | * a non-bridged device or another bridge port group. | |
154 | * The packet will need to be routed. | |
155 | * | |
156 | * The correct way of distinguishing between these two cases is to | |
157 | * call ip_route_input() and to look at skb->dst->dev, which is | |
158 | * changed to the destination device if ip_route_input() succeeds. | |
159 | * | |
160 | * Let us first consider the case that ip_route_input() succeeds: | |
161 | * | |
162 | * If skb->dst->dev equals the logical bridge device the packet | |
163 | * came in on, we can consider this bridging. We then call | |
164 | * skb->dst->output() which will make the packet enter br_nf_local_out() | |
165 | * not much later. In that function it is assured that the iptables | |
166 | * FORWARD chain is traversed for the packet. | |
167 | * | |
168 | * Otherwise, the packet is considered to be routed and we just | |
169 | * change the destination MAC address so that the packet will | |
170 | * later be passed up to the IP stack to be routed. | |
171 | * | |
172 | * Let us now consider the case that ip_route_input() fails: | |
173 | * | |
174 | * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input() | |
175 | * will fail, while __ip_route_output_key() will return success. The source | |
176 | * address for __ip_route_output_key() is set to zero, so __ip_route_output_key | |
177 | * thinks we're handling a locally generated packet and won't care | |
178 | * if IP forwarding is allowed. We send a warning message to the users's | |
179 | * log telling her to put IP forwarding on. | |
180 | * | |
181 | * ip_route_input() will also fail if there is no route available. | |
182 | * In that case we just drop the packet. | |
183 | * | |
184 | * --Lennert, 20020411 | |
185 | * --Bart, 20020416 (updated) | |
186 | * --Bart, 20021007 (updated) */ | |
187 | static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb) | |
188 | { | |
1da177e4 LT |
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); | |
5dce971a SH |
196 | if (!skb->dev) |
197 | kfree_skb(skb); | |
198 | else { | |
f8a26028 | 199 | if (skb->protocol == htons(ETH_P_8021Q)) { |
5dce971a SH |
200 | skb_pull(skb, VLAN_HLEN); |
201 | skb->nh.raw += VLAN_HLEN; | |
202 | } | |
203 | skb->dst->output(skb); | |
1da177e4 | 204 | } |
1da177e4 LT |
205 | return 0; |
206 | } | |
207 | ||
208 | static int br_nf_pre_routing_finish(struct sk_buff *skb) | |
209 | { | |
210 | struct net_device *dev = skb->dev; | |
211 | struct iphdr *iph = skb->nh.iph; | |
212 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
213 | ||
1da177e4 LT |
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)) { | |
789bc3e5 | 221 | if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev)) { |
1da177e4 | 222 | struct rtable *rt; |
789bc3e5 SH |
223 | struct flowi fl = { |
224 | .nl_u = { | |
225 | .ip4_u = { | |
226 | .daddr = iph->daddr, | |
227 | .saddr = 0, | |
228 | .tos = RT_TOS(iph->tos) }, | |
229 | }, | |
230 | .proto = 0, | |
231 | }; | |
1da177e4 LT |
232 | |
233 | if (!ip_route_output_key(&rt, &fl)) { | |
1c011bed BDS |
234 | /* - Bridged-and-DNAT'ed traffic doesn't |
235 | * require ip_forwarding. | |
236 | * - Deal with redirected traffic. */ | |
237 | if (((struct dst_entry *)rt)->dev == dev || | |
238 | rt->rt_type == RTN_LOCAL) { | |
1da177e4 LT |
239 | skb->dst = (struct dst_entry *)rt; |
240 | goto bridged_dnat; | |
241 | } | |
242 | __br_dnat_complain(); | |
243 | dst_release((struct dst_entry *)rt); | |
244 | } | |
245 | kfree_skb(skb); | |
246 | return 0; | |
247 | } else { | |
248 | if (skb->dst->dev == dev) { | |
249 | bridged_dnat: | |
250 | /* Tell br_nf_local_out this is a | |
251 | * bridged frame */ | |
252 | nf_bridge->mask |= BRNF_BRIDGED_DNAT; | |
253 | skb->dev = nf_bridge->physindev; | |
254 | if (skb->protocol == | |
f8a26028 | 255 | htons(ETH_P_8021Q)) { |
1da177e4 LT |
256 | skb_push(skb, VLAN_HLEN); |
257 | skb->nh.raw -= VLAN_HLEN; | |
258 | } | |
259 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, | |
260 | skb, skb->dev, NULL, | |
261 | br_nf_pre_routing_finish_bridge, | |
262 | 1); | |
263 | return 0; | |
264 | } | |
789bc3e5 | 265 | memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN); |
1da177e4 LT |
266 | skb->pkt_type = PACKET_HOST; |
267 | } | |
268 | } else { | |
269 | skb->dst = (struct dst_entry *)&__fake_rtable; | |
270 | dst_hold(skb->dst); | |
271 | } | |
272 | ||
273 | skb->dev = nf_bridge->physindev; | |
f8a26028 | 274 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
275 | skb_push(skb, VLAN_HLEN); |
276 | skb->nh.raw -= VLAN_HLEN; | |
277 | } | |
278 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
279 | br_handle_frame_finish, 1); | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | /* Some common code for IPv4/IPv6 */ | |
5dce971a | 285 | static struct net_device *setup_pre_routing(struct sk_buff *skb) |
1da177e4 LT |
286 | { |
287 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
288 | ||
289 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
290 | skb->pkt_type = PACKET_HOST; | |
291 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
292 | } | |
293 | ||
294 | nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING; | |
295 | nf_bridge->physindev = skb->dev; | |
296 | skb->dev = bridge_parent(skb->dev); | |
5dce971a SH |
297 | |
298 | return skb->dev; | |
1da177e4 LT |
299 | } |
300 | ||
301 | /* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */ | |
302 | static int check_hbh_len(struct sk_buff *skb) | |
303 | { | |
789bc3e5 | 304 | unsigned char *raw = (u8 *) (skb->nh.ipv6h + 1); |
1da177e4 LT |
305 | u32 pkt_len; |
306 | int off = raw - skb->nh.raw; | |
789bc3e5 | 307 | int len = (raw[1] + 1) << 3; |
1da177e4 LT |
308 | |
309 | if ((raw + len) - skb->data > skb_headlen(skb)) | |
310 | goto bad; | |
311 | ||
312 | off += 2; | |
313 | len -= 2; | |
314 | ||
315 | while (len > 0) { | |
789bc3e5 | 316 | int optlen = skb->nh.raw[off + 1] + 2; |
1da177e4 LT |
317 | |
318 | switch (skb->nh.raw[off]) { | |
319 | case IPV6_TLV_PAD0: | |
320 | optlen = 1; | |
321 | break; | |
322 | ||
323 | case IPV6_TLV_PADN: | |
324 | break; | |
325 | ||
326 | case IPV6_TLV_JUMBO: | |
789bc3e5 | 327 | if (skb->nh.raw[off + 1] != 4 || (off & 3) != 2) |
1da177e4 | 328 | goto bad; |
789bc3e5 | 329 | pkt_len = ntohl(*(u32 *) (skb->nh.raw + off + 2)); |
b0366486 BDS |
330 | if (pkt_len <= IPV6_MAXPLEN || |
331 | skb->nh.ipv6h->payload_len) | |
332 | goto bad; | |
1da177e4 LT |
333 | if (pkt_len > skb->len - sizeof(struct ipv6hdr)) |
334 | goto bad; | |
b0366486 | 335 | if (pskb_trim_rcsum(skb, |
789bc3e5 | 336 | pkt_len + sizeof(struct ipv6hdr))) |
b0366486 | 337 | goto bad; |
1da177e4 LT |
338 | break; |
339 | default: | |
340 | if (optlen > len) | |
341 | goto bad; | |
342 | break; | |
343 | } | |
344 | off += optlen; | |
345 | len -= optlen; | |
346 | } | |
347 | if (len == 0) | |
348 | return 0; | |
349 | bad: | |
350 | return -1; | |
351 | ||
352 | } | |
353 | ||
354 | /* Replicate the checks that IPv6 does on packet reception and pass the packet | |
355 | * to ip6tables, which doesn't support NAT, so things are fairly simple. */ | |
356 | static unsigned int br_nf_pre_routing_ipv6(unsigned int hook, | |
789bc3e5 SH |
357 | struct sk_buff *skb, |
358 | const struct net_device *in, | |
359 | const struct net_device *out, | |
360 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
361 | { |
362 | struct ipv6hdr *hdr; | |
363 | u32 pkt_len; | |
364 | struct nf_bridge_info *nf_bridge; | |
365 | ||
366 | if (skb->len < sizeof(struct ipv6hdr)) | |
367 | goto inhdr_error; | |
368 | ||
369 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
370 | goto inhdr_error; | |
371 | ||
372 | hdr = skb->nh.ipv6h; | |
373 | ||
374 | if (hdr->version != 6) | |
375 | goto inhdr_error; | |
376 | ||
377 | pkt_len = ntohs(hdr->payload_len); | |
378 | ||
379 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
380 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) | |
381 | goto inhdr_error; | |
382 | if (pkt_len + sizeof(struct ipv6hdr) < skb->len) { | |
383 | if (__pskb_trim(skb, pkt_len + sizeof(struct ipv6hdr))) | |
384 | goto inhdr_error; | |
385 | if (skb->ip_summed == CHECKSUM_HW) | |
386 | skb->ip_summed = CHECKSUM_NONE; | |
387 | } | |
388 | } | |
389 | if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb)) | |
789bc3e5 | 390 | goto inhdr_error; |
1da177e4 | 391 | |
789bc3e5 | 392 | nf_bridge_put(skb->nf_bridge); |
1da177e4 LT |
393 | if ((nf_bridge = nf_bridge_alloc(skb)) == NULL) |
394 | return NF_DROP; | |
5dce971a SH |
395 | if (!setup_pre_routing(skb)) |
396 | return NF_DROP; | |
1da177e4 LT |
397 | |
398 | NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL, | |
399 | br_nf_pre_routing_finish_ipv6); | |
400 | ||
401 | return NF_STOLEN; | |
402 | ||
403 | inhdr_error: | |
404 | return NF_DROP; | |
405 | } | |
406 | ||
407 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
408 | * Replicate the checks that IPv4 does on packet reception. | |
409 | * Set skb->dev to the bridge device (i.e. parent of the | |
410 | * receiving device) to make netfilter happy, the REDIRECT | |
411 | * target in particular. Save the original destination IP | |
412 | * address to be able to detect DNAT afterwards. */ | |
413 | static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, | |
ee02b3a6 SH |
414 | const struct net_device *in, |
415 | const struct net_device *out, | |
416 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
417 | { |
418 | struct iphdr *iph; | |
419 | __u32 len; | |
420 | struct sk_buff *skb = *pskb; | |
421 | struct nf_bridge_info *nf_bridge; | |
422 | struct vlan_ethhdr *hdr = vlan_eth_hdr(*pskb); | |
423 | ||
f8a26028 | 424 | if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6) { |
1da177e4 LT |
425 | #ifdef CONFIG_SYSCTL |
426 | if (!brnf_call_ip6tables) | |
427 | return NF_ACCEPT; | |
428 | #endif | |
429 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
430 | goto out; | |
431 | ||
f8a26028 | 432 | if (skb->protocol == htons(ETH_P_8021Q)) { |
cbb042f9 | 433 | skb_pull_rcsum(skb, VLAN_HLEN); |
ee02b3a6 | 434 | skb->nh.raw += VLAN_HLEN; |
1da177e4 LT |
435 | } |
436 | return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); | |
437 | } | |
438 | #ifdef CONFIG_SYSCTL | |
439 | if (!brnf_call_iptables) | |
440 | return NF_ACCEPT; | |
441 | #endif | |
442 | ||
f8a26028 | 443 | if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP) |
1da177e4 LT |
444 | return NF_ACCEPT; |
445 | ||
446 | if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) | |
447 | goto out; | |
448 | ||
f8a26028 | 449 | if (skb->protocol == htons(ETH_P_8021Q)) { |
cbb042f9 | 450 | skb_pull_rcsum(skb, VLAN_HLEN); |
ee02b3a6 | 451 | skb->nh.raw += VLAN_HLEN; |
1da177e4 LT |
452 | } |
453 | ||
454 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
455 | goto inhdr_error; | |
456 | ||
457 | iph = skb->nh.iph; | |
458 | if (iph->ihl < 5 || iph->version != 4) | |
459 | goto inhdr_error; | |
460 | ||
789bc3e5 | 461 | if (!pskb_may_pull(skb, 4 * iph->ihl)) |
1da177e4 LT |
462 | goto inhdr_error; |
463 | ||
464 | iph = skb->nh.iph; | |
789bc3e5 | 465 | if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0) |
1da177e4 LT |
466 | goto inhdr_error; |
467 | ||
468 | len = ntohs(iph->tot_len); | |
789bc3e5 | 469 | if (skb->len < len || len < 4 * iph->ihl) |
1da177e4 LT |
470 | goto inhdr_error; |
471 | ||
472 | if (skb->len > len) { | |
473 | __pskb_trim(skb, len); | |
474 | if (skb->ip_summed == CHECKSUM_HW) | |
475 | skb->ip_summed = CHECKSUM_NONE; | |
476 | } | |
477 | ||
789bc3e5 | 478 | nf_bridge_put(skb->nf_bridge); |
1da177e4 LT |
479 | if ((nf_bridge = nf_bridge_alloc(skb)) == NULL) |
480 | return NF_DROP; | |
5dce971a SH |
481 | if (!setup_pre_routing(skb)) |
482 | return NF_DROP; | |
1da177e4 LT |
483 | store_orig_dstaddr(skb); |
484 | ||
485 | NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL, | |
486 | br_nf_pre_routing_finish); | |
487 | ||
488 | return NF_STOLEN; | |
489 | ||
490 | inhdr_error: | |
789bc3e5 | 491 | // IP_INC_STATS_BH(IpInHdrErrors); |
1da177e4 LT |
492 | out: |
493 | return NF_DROP; | |
494 | } | |
495 | ||
496 | ||
497 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
498 | /* The packet is locally destined, which requires a real | |
499 | * dst_entry, so detach the fake one. On the way up, the | |
500 | * packet would pass through PRE_ROUTING again (which already | |
501 | * took place when the packet entered the bridge), but we | |
502 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
503 | * prevent this from happening. */ | |
504 | static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
505 | const struct net_device *in, |
506 | const struct net_device *out, | |
507 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
508 | { |
509 | struct sk_buff *skb = *pskb; | |
510 | ||
511 | if (skb->dst == (struct dst_entry *)&__fake_rtable) { | |
512 | dst_release(skb->dst); | |
513 | skb->dst = NULL; | |
514 | } | |
515 | ||
516 | return NF_ACCEPT; | |
517 | } | |
518 | ||
1da177e4 LT |
519 | /* PF_BRIDGE/FORWARD *************************************************/ |
520 | static int br_nf_forward_finish(struct sk_buff *skb) | |
521 | { | |
522 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
523 | struct net_device *in; | |
524 | struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); | |
525 | ||
f8a26028 | 526 | if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP) { |
1da177e4 LT |
527 | in = nf_bridge->physindev; |
528 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
529 | skb->pkt_type = PACKET_OTHERHOST; | |
530 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
531 | } | |
532 | } else { | |
533 | in = *((struct net_device **)(skb->cb)); | |
534 | } | |
f8a26028 | 535 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
536 | skb_push(skb, VLAN_HLEN); |
537 | skb->nh.raw -= VLAN_HLEN; | |
538 | } | |
539 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in, | |
789bc3e5 | 540 | skb->dev, br_forward_finish, 1); |
1da177e4 LT |
541 | return 0; |
542 | } | |
543 | ||
544 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
545 | * netfilter with indev and outdev set to the bridge device, | |
546 | * but we are still able to filter on the 'real' indev/outdev | |
547 | * because of the physdev module. For ARP, indev and outdev are the | |
548 | * bridge ports. */ | |
549 | static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
550 | const struct net_device *in, |
551 | const struct net_device *out, | |
552 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
553 | { |
554 | struct sk_buff *skb = *pskb; | |
555 | struct nf_bridge_info *nf_bridge; | |
556 | struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); | |
5dce971a | 557 | struct net_device *parent; |
1da177e4 LT |
558 | int pf; |
559 | ||
560 | if (!skb->nf_bridge) | |
561 | return NF_ACCEPT; | |
562 | ||
5dce971a SH |
563 | parent = bridge_parent(out); |
564 | if (!parent) | |
565 | return NF_DROP; | |
566 | ||
f8a26028 | 567 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP) |
1da177e4 LT |
568 | pf = PF_INET; |
569 | else | |
570 | pf = PF_INET6; | |
571 | ||
f8a26028 | 572 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
573 | skb_pull(*pskb, VLAN_HLEN); |
574 | (*pskb)->nh.raw += VLAN_HLEN; | |
575 | } | |
576 | ||
1da177e4 LT |
577 | nf_bridge = skb->nf_bridge; |
578 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
579 | skb->pkt_type = PACKET_HOST; | |
580 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
581 | } | |
582 | ||
583 | /* The physdev module checks on this */ | |
584 | nf_bridge->mask |= BRNF_BRIDGED; | |
585 | nf_bridge->physoutdev = skb->dev; | |
586 | ||
5dce971a SH |
587 | NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), parent, |
588 | br_nf_forward_finish); | |
1da177e4 LT |
589 | |
590 | return NF_STOLEN; | |
591 | } | |
592 | ||
593 | static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
594 | const struct net_device *in, |
595 | const struct net_device *out, | |
596 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
597 | { |
598 | struct sk_buff *skb = *pskb; | |
599 | struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); | |
600 | struct net_device **d = (struct net_device **)(skb->cb); | |
601 | ||
602 | #ifdef CONFIG_SYSCTL | |
603 | if (!brnf_call_arptables) | |
604 | return NF_ACCEPT; | |
605 | #endif | |
606 | ||
f8a26028 | 607 | if (skb->protocol != htons(ETH_P_ARP)) { |
1da177e4 LT |
608 | if (!IS_VLAN_ARP) |
609 | return NF_ACCEPT; | |
610 | skb_pull(*pskb, VLAN_HLEN); | |
611 | (*pskb)->nh.raw += VLAN_HLEN; | |
612 | } | |
613 | ||
1da177e4 LT |
614 | if (skb->nh.arph->ar_pln != 4) { |
615 | if (IS_VLAN_ARP) { | |
616 | skb_push(*pskb, VLAN_HLEN); | |
617 | (*pskb)->nh.raw -= VLAN_HLEN; | |
618 | } | |
619 | return NF_ACCEPT; | |
620 | } | |
621 | *d = (struct net_device *)in; | |
622 | NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in, | |
623 | (struct net_device *)out, br_nf_forward_finish); | |
624 | ||
625 | return NF_STOLEN; | |
626 | } | |
627 | ||
1da177e4 LT |
628 | /* PF_BRIDGE/LOCAL_OUT ***********************************************/ |
629 | static int br_nf_local_out_finish(struct sk_buff *skb) | |
630 | { | |
f8a26028 | 631 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
632 | skb_push(skb, VLAN_HLEN); |
633 | skb->nh.raw -= VLAN_HLEN; | |
634 | } | |
635 | ||
636 | NF_HOOK_THRESH(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, | |
789bc3e5 | 637 | br_forward_finish, NF_BR_PRI_FIRST + 1); |
1da177e4 LT |
638 | |
639 | return 0; | |
640 | } | |
641 | ||
642 | /* This function sees both locally originated IP packets and forwarded | |
643 | * IP packets (in both cases the destination device is a bridge | |
644 | * device). It also sees bridged-and-DNAT'ed packets. | |
645 | * To be able to filter on the physical bridge devices (with the physdev | |
646 | * module), we steal packets destined to a bridge device away from the | |
647 | * PF_INET/FORWARD and PF_INET/OUTPUT hook functions, and give them back later, | |
648 | * when we have determined the real output device. This is done in here. | |
649 | * | |
650 | * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged | |
651 | * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward() | |
652 | * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority | |
653 | * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor | |
654 | * will be executed. | |
655 | * Otherwise, if nf_bridge->physindev is NULL, the bridge-nf code never touched | |
656 | * this packet before, and so the packet was locally originated. We fake | |
657 | * the PF_INET/LOCAL_OUT hook. | |
658 | * Finally, if nf_bridge->physindev isn't NULL, then the packet was IP routed, | |
659 | * so we fake the PF_INET/FORWARD hook. ip_sabotage_out() makes sure | |
660 | * even routed packets that didn't arrive on a bridge interface have their | |
661 | * nf_bridge->physindev set. */ | |
662 | static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
663 | const struct net_device *in, |
664 | const struct net_device *out, | |
665 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
666 | { |
667 | struct net_device *realindev, *realoutdev; | |
668 | struct sk_buff *skb = *pskb; | |
669 | struct nf_bridge_info *nf_bridge; | |
670 | struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); | |
671 | int pf; | |
672 | ||
673 | if (!skb->nf_bridge) | |
674 | return NF_ACCEPT; | |
675 | ||
f8a26028 | 676 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP) |
1da177e4 LT |
677 | pf = PF_INET; |
678 | else | |
679 | pf = PF_INET6; | |
680 | ||
681 | #ifdef CONFIG_NETFILTER_DEBUG | |
682 | /* Sometimes we get packets with NULL ->dst here (for example, | |
683 | * running a dhcp client daemon triggers this). This should now | |
684 | * be fixed, but let's keep the check around. */ | |
685 | if (skb->dst == NULL) { | |
686 | printk(KERN_CRIT "br_netfilter: skb->dst == NULL."); | |
687 | return NF_ACCEPT; | |
688 | } | |
689 | #endif | |
690 | ||
691 | nf_bridge = skb->nf_bridge; | |
692 | nf_bridge->physoutdev = skb->dev; | |
693 | realindev = nf_bridge->physindev; | |
694 | ||
695 | /* Bridged, take PF_BRIDGE/FORWARD. | |
696 | * (see big note in front of br_nf_pre_routing_finish) */ | |
697 | if (nf_bridge->mask & BRNF_BRIDGED_DNAT) { | |
698 | if (nf_bridge->mask & BRNF_PKT_TYPE) { | |
699 | skb->pkt_type = PACKET_OTHERHOST; | |
700 | nf_bridge->mask ^= BRNF_PKT_TYPE; | |
701 | } | |
f8a26028 | 702 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
703 | skb_push(skb, VLAN_HLEN); |
704 | skb->nh.raw -= VLAN_HLEN; | |
705 | } | |
706 | ||
707 | NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev, | |
708 | skb->dev, br_forward_finish); | |
709 | goto out; | |
710 | } | |
711 | realoutdev = bridge_parent(skb->dev); | |
5dce971a SH |
712 | if (!realoutdev) |
713 | return NF_DROP; | |
1da177e4 LT |
714 | |
715 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
716 | /* iptables should match -o br0.x */ | |
717 | if (nf_bridge->netoutdev) | |
718 | realoutdev = nf_bridge->netoutdev; | |
719 | #endif | |
f8a26028 | 720 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
721 | skb_pull(skb, VLAN_HLEN); |
722 | (*pskb)->nh.raw += VLAN_HLEN; | |
723 | } | |
724 | /* IP forwarded traffic has a physindev, locally | |
725 | * generated traffic hasn't. */ | |
726 | if (realindev != NULL) { | |
789bc3e5 | 727 | if (!(nf_bridge->mask & BRNF_DONT_TAKE_PARENT)) { |
5dce971a SH |
728 | struct net_device *parent = bridge_parent(realindev); |
729 | if (parent) | |
730 | realindev = parent; | |
731 | } | |
1da177e4 LT |
732 | |
733 | NF_HOOK_THRESH(pf, NF_IP_FORWARD, skb, realindev, | |
734 | realoutdev, br_nf_local_out_finish, | |
735 | NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD + 1); | |
736 | } else { | |
1da177e4 LT |
737 | NF_HOOK_THRESH(pf, NF_IP_LOCAL_OUT, skb, realindev, |
738 | realoutdev, br_nf_local_out_finish, | |
739 | NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1); | |
740 | } | |
741 | ||
742 | out: | |
743 | return NF_STOLEN; | |
744 | } | |
745 | ||
746 | ||
747 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
748 | static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
749 | const struct net_device *in, |
750 | const struct net_device *out, | |
751 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
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: " | |
789bc3e5 | 764 | "bad mac.raw pointer."); |
1da177e4 LT |
765 | goto print_error; |
766 | } | |
767 | #endif | |
768 | ||
769 | if (!nf_bridge) | |
770 | return NF_ACCEPT; | |
771 | ||
5dce971a SH |
772 | if (!realoutdev) |
773 | return NF_DROP; | |
774 | ||
f8a26028 | 775 | if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP) |
1da177e4 LT |
776 | pf = PF_INET; |
777 | else | |
778 | pf = PF_INET6; | |
779 | ||
780 | #ifdef CONFIG_NETFILTER_DEBUG | |
781 | if (skb->dst == NULL) { | |
782 | printk(KERN_CRIT "br_netfilter: skb->dst == NULL."); | |
783 | goto print_error; | |
784 | } | |
1da177e4 LT |
785 | #endif |
786 | ||
787 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
788 | * about the value of skb->pkt_type. */ | |
789 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
790 | skb->pkt_type = PACKET_HOST; | |
791 | nf_bridge->mask |= BRNF_PKT_TYPE; | |
792 | } | |
793 | ||
f8a26028 | 794 | if (skb->protocol == htons(ETH_P_8021Q)) { |
1da177e4 LT |
795 | skb_pull(skb, VLAN_HLEN); |
796 | skb->nh.raw += VLAN_HLEN; | |
797 | } | |
798 | ||
799 | nf_bridge_save_header(skb); | |
800 | ||
801 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
802 | if (nf_bridge->netoutdev) | |
803 | realoutdev = nf_bridge->netoutdev; | |
804 | #endif | |
805 | NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev, | |
789bc3e5 | 806 | br_dev_queue_push_xmit); |
1da177e4 LT |
807 | |
808 | return NF_STOLEN; | |
809 | ||
810 | #ifdef CONFIG_NETFILTER_DEBUG | |
811 | print_error: | |
812 | if (skb->dev != NULL) { | |
813 | printk("[%s]", skb->dev->name); | |
178a3259 SH |
814 | if (realoutdev) |
815 | printk("[%s]", realoutdev->name); | |
1da177e4 LT |
816 | } |
817 | printk(" head:%p, raw:%p, data:%p\n", skb->head, skb->mac.raw, | |
789bc3e5 | 818 | skb->data); |
1da177e4 LT |
819 | return NF_ACCEPT; |
820 | #endif | |
821 | } | |
822 | ||
1da177e4 LT |
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, | |
789bc3e5 SH |
827 | const struct net_device *in, |
828 | const struct net_device *out, | |
829 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
830 | { |
831 | if ((*pskb)->nf_bridge && | |
832 | !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) { | |
833 | return NF_STOP; | |
834 | } | |
835 | ||
836 | return NF_ACCEPT; | |
837 | } | |
838 | ||
839 | /* Postpone execution of PF_INET(6)/FORWARD, PF_INET(6)/LOCAL_OUT | |
840 | * and PF_INET(6)/POST_ROUTING until we have done the forwarding | |
841 | * decision in the bridge code and have determined nf_bridge->physoutdev. */ | |
842 | static unsigned int ip_sabotage_out(unsigned int hook, struct sk_buff **pskb, | |
789bc3e5 SH |
843 | const struct net_device *in, |
844 | const struct net_device *out, | |
845 | int (*okfn)(struct sk_buff *)) | |
1da177e4 LT |
846 | { |
847 | struct sk_buff *skb = *pskb; | |
848 | ||
849 | if ((out->hard_start_xmit == br_dev_xmit && | |
789bc3e5 SH |
850 | okfn != br_nf_forward_finish && |
851 | okfn != br_nf_local_out_finish && okfn != br_dev_queue_push_xmit) | |
1da177e4 LT |
852 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
853 | || ((out->priv_flags & IFF_802_1Q_VLAN) && | |
789bc3e5 | 854 | VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit) |
1da177e4 LT |
855 | #endif |
856 | ) { | |
857 | struct nf_bridge_info *nf_bridge; | |
858 | ||
859 | if (!skb->nf_bridge) { | |
860 | #ifdef CONFIG_SYSCTL | |
861 | /* This code is executed while in the IP(v6) stack, | |
862 | the version should be 4 or 6. We can't use | |
863 | skb->protocol because that isn't set on | |
864 | PF_INET(6)/LOCAL_OUT. */ | |
865 | struct iphdr *ip = skb->nh.iph; | |
866 | ||
867 | if (ip->version == 4 && !brnf_call_iptables) | |
868 | return NF_ACCEPT; | |
869 | else if (ip->version == 6 && !brnf_call_ip6tables) | |
870 | return NF_ACCEPT; | |
871 | #endif | |
872 | if (hook == NF_IP_POST_ROUTING) | |
873 | return NF_ACCEPT; | |
874 | if (!nf_bridge_alloc(skb)) | |
875 | return NF_DROP; | |
876 | } | |
877 | ||
878 | nf_bridge = skb->nf_bridge; | |
879 | ||
880 | /* This frame will arrive on PF_BRIDGE/LOCAL_OUT and we | |
881 | * will need the indev then. For a brouter, the real indev | |
882 | * can be a bridge port, so we make sure br_nf_local_out() | |
883 | * doesn't use the bridge parent of the indev by using | |
884 | * the BRNF_DONT_TAKE_PARENT mask. */ | |
885 | if (hook == NF_IP_FORWARD && nf_bridge->physindev == NULL) { | |
9666dae5 | 886 | nf_bridge->mask |= BRNF_DONT_TAKE_PARENT; |
1da177e4 LT |
887 | nf_bridge->physindev = (struct net_device *)in; |
888 | } | |
889 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | |
890 | /* the iptables outdev is br0.x, not br0 */ | |
891 | if (out->priv_flags & IFF_802_1Q_VLAN) | |
892 | nf_bridge->netoutdev = (struct net_device *)out; | |
893 | #endif | |
894 | return NF_STOP; | |
895 | } | |
896 | ||
897 | return NF_ACCEPT; | |
898 | } | |
899 | ||
900 | /* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent | |
901 | * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input. | |
902 | * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
903 | * ip_refrag() can return NF_STOLEN. */ | |
904 | static struct nf_hook_ops br_nf_ops[] = { | |
905 | { .hook = br_nf_pre_routing, | |
906 | .owner = THIS_MODULE, | |
907 | .pf = PF_BRIDGE, | |
908 | .hooknum = NF_BR_PRE_ROUTING, | |
909 | .priority = NF_BR_PRI_BRNF, }, | |
910 | { .hook = br_nf_local_in, | |
911 | .owner = THIS_MODULE, | |
912 | .pf = PF_BRIDGE, | |
913 | .hooknum = NF_BR_LOCAL_IN, | |
914 | .priority = NF_BR_PRI_BRNF, }, | |
915 | { .hook = br_nf_forward_ip, | |
916 | .owner = THIS_MODULE, | |
917 | .pf = PF_BRIDGE, | |
918 | .hooknum = NF_BR_FORWARD, | |
919 | .priority = NF_BR_PRI_BRNF - 1, }, | |
920 | { .hook = br_nf_forward_arp, | |
921 | .owner = THIS_MODULE, | |
922 | .pf = PF_BRIDGE, | |
923 | .hooknum = NF_BR_FORWARD, | |
924 | .priority = NF_BR_PRI_BRNF, }, | |
925 | { .hook = br_nf_local_out, | |
926 | .owner = THIS_MODULE, | |
927 | .pf = PF_BRIDGE, | |
928 | .hooknum = NF_BR_LOCAL_OUT, | |
929 | .priority = NF_BR_PRI_FIRST, }, | |
930 | { .hook = br_nf_post_routing, | |
931 | .owner = THIS_MODULE, | |
932 | .pf = PF_BRIDGE, | |
933 | .hooknum = NF_BR_POST_ROUTING, | |
934 | .priority = NF_BR_PRI_LAST, }, | |
935 | { .hook = ip_sabotage_in, | |
936 | .owner = THIS_MODULE, | |
937 | .pf = PF_INET, | |
938 | .hooknum = NF_IP_PRE_ROUTING, | |
939 | .priority = NF_IP_PRI_FIRST, }, | |
940 | { .hook = ip_sabotage_in, | |
941 | .owner = THIS_MODULE, | |
942 | .pf = PF_INET6, | |
943 | .hooknum = NF_IP6_PRE_ROUTING, | |
944 | .priority = NF_IP6_PRI_FIRST, }, | |
945 | { .hook = ip_sabotage_out, | |
946 | .owner = THIS_MODULE, | |
947 | .pf = PF_INET, | |
948 | .hooknum = NF_IP_FORWARD, | |
949 | .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, }, | |
950 | { .hook = ip_sabotage_out, | |
951 | .owner = THIS_MODULE, | |
952 | .pf = PF_INET6, | |
953 | .hooknum = NF_IP6_FORWARD, | |
954 | .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_FORWARD, }, | |
955 | { .hook = ip_sabotage_out, | |
956 | .owner = THIS_MODULE, | |
957 | .pf = PF_INET, | |
958 | .hooknum = NF_IP_LOCAL_OUT, | |
959 | .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, }, | |
960 | { .hook = ip_sabotage_out, | |
961 | .owner = THIS_MODULE, | |
962 | .pf = PF_INET6, | |
963 | .hooknum = NF_IP6_LOCAL_OUT, | |
964 | .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, }, | |
965 | { .hook = ip_sabotage_out, | |
966 | .owner = THIS_MODULE, | |
967 | .pf = PF_INET, | |
968 | .hooknum = NF_IP_POST_ROUTING, | |
969 | .priority = NF_IP_PRI_FIRST, }, | |
970 | { .hook = ip_sabotage_out, | |
971 | .owner = THIS_MODULE, | |
972 | .pf = PF_INET6, | |
973 | .hooknum = NF_IP6_POST_ROUTING, | |
974 | .priority = NF_IP6_PRI_FIRST, }, | |
975 | }; | |
976 | ||
977 | #ifdef CONFIG_SYSCTL | |
978 | static | |
789bc3e5 SH |
979 | int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp, |
980 | void __user * buffer, size_t * lenp, loff_t * ppos) | |
1da177e4 LT |
981 | { |
982 | int ret; | |
983 | ||
984 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
985 | ||
986 | if (write && *(int *)(ctl->data)) | |
987 | *(int *)(ctl->data) = 1; | |
988 | return ret; | |
989 | } | |
990 | ||
991 | static ctl_table brnf_table[] = { | |
992 | { | |
993 | .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES, | |
994 | .procname = "bridge-nf-call-arptables", | |
995 | .data = &brnf_call_arptables, | |
996 | .maxlen = sizeof(int), | |
997 | .mode = 0644, | |
998 | .proc_handler = &brnf_sysctl_call_tables, | |
999 | }, | |
1000 | { | |
1001 | .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES, | |
1002 | .procname = "bridge-nf-call-iptables", | |
1003 | .data = &brnf_call_iptables, | |
1004 | .maxlen = sizeof(int), | |
1005 | .mode = 0644, | |
1006 | .proc_handler = &brnf_sysctl_call_tables, | |
1007 | }, | |
1008 | { | |
1009 | .ctl_name = NET_BRIDGE_NF_CALL_IP6TABLES, | |
1010 | .procname = "bridge-nf-call-ip6tables", | |
1011 | .data = &brnf_call_ip6tables, | |
1012 | .maxlen = sizeof(int), | |
1013 | .mode = 0644, | |
1014 | .proc_handler = &brnf_sysctl_call_tables, | |
1015 | }, | |
1016 | { | |
1017 | .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED, | |
1018 | .procname = "bridge-nf-filter-vlan-tagged", | |
1019 | .data = &brnf_filter_vlan_tagged, | |
1020 | .maxlen = sizeof(int), | |
1021 | .mode = 0644, | |
1022 | .proc_handler = &brnf_sysctl_call_tables, | |
1023 | }, | |
1024 | { .ctl_name = 0 } | |
1025 | }; | |
1026 | ||
1027 | static ctl_table brnf_bridge_table[] = { | |
1028 | { | |
1029 | .ctl_name = NET_BRIDGE, | |
1030 | .procname = "bridge", | |
1031 | .mode = 0555, | |
1032 | .child = brnf_table, | |
1033 | }, | |
1034 | { .ctl_name = 0 } | |
1035 | }; | |
1036 | ||
1037 | static ctl_table brnf_net_table[] = { | |
1038 | { | |
1039 | .ctl_name = CTL_NET, | |
1040 | .procname = "net", | |
1041 | .mode = 0555, | |
1042 | .child = brnf_bridge_table, | |
1043 | }, | |
1044 | { .ctl_name = 0 } | |
1045 | }; | |
1046 | #endif | |
1047 | ||
1048 | int br_netfilter_init(void) | |
1049 | { | |
1050 | int i; | |
1051 | ||
1052 | for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) { | |
1053 | int ret; | |
1054 | ||
1055 | if ((ret = nf_register_hook(&br_nf_ops[i])) >= 0) | |
1056 | continue; | |
1057 | ||
1058 | while (i--) | |
1059 | nf_unregister_hook(&br_nf_ops[i]); | |
1060 | ||
1061 | return ret; | |
1062 | } | |
1063 | ||
1064 | #ifdef CONFIG_SYSCTL | |
1065 | brnf_sysctl_header = register_sysctl_table(brnf_net_table, 0); | |
1066 | if (brnf_sysctl_header == NULL) { | |
789bc3e5 SH |
1067 | printk(KERN_WARNING |
1068 | "br_netfilter: can't register to sysctl.\n"); | |
1da177e4 LT |
1069 | for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) |
1070 | nf_unregister_hook(&br_nf_ops[i]); | |
1071 | return -EFAULT; | |
1072 | } | |
1073 | #endif | |
1074 | ||
1075 | printk(KERN_NOTICE "Bridge firewalling registered\n"); | |
1076 | ||
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | void br_netfilter_fini(void) | |
1081 | { | |
1082 | int i; | |
1083 | ||
1084 | for (i = ARRAY_SIZE(br_nf_ops) - 1; i >= 0; i--) | |
1085 | nf_unregister_hook(&br_nf_ops[i]); | |
1086 | #ifdef CONFIG_SYSCTL | |
1087 | unregister_sysctl_table(brnf_sysctl_header); | |
1088 | #endif | |
1089 | } |