]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Handle firewalling | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * Bart De Schuymer <bdschuym@pandora.be> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Lennert dedicates this file to Kerstin Wurdinger. | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/ip.h> | |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/if_arp.h> | |
24 | #include <linux/if_ether.h> | |
25 | #include <linux/if_vlan.h> | |
26 | #include <linux/if_pppox.h> | |
27 | #include <linux/ppp_defs.h> | |
28 | #include <linux/netfilter_bridge.h> | |
29 | #include <linux/netfilter_ipv4.h> | |
30 | #include <linux/netfilter_ipv6.h> | |
31 | #include <linux/netfilter_arp.h> | |
32 | #include <linux/in_route.h> | |
33 | #include <linux/inetdevice.h> | |
34 | ||
35 | #include <net/ip.h> | |
36 | #include <net/ipv6.h> | |
37 | #include <net/addrconf.h> | |
38 | #include <net/route.h> | |
39 | #include <net/netfilter/br_netfilter.h> | |
40 | #include <net/netns/generic.h> | |
41 | ||
42 | #include <asm/uaccess.h> | |
43 | #include "br_private.h" | |
44 | #ifdef CONFIG_SYSCTL | |
45 | #include <linux/sysctl.h> | |
46 | #endif | |
47 | ||
48 | static int brnf_net_id __read_mostly; | |
49 | ||
50 | struct brnf_net { | |
51 | bool enabled; | |
52 | }; | |
53 | ||
54 | #ifdef CONFIG_SYSCTL | |
55 | static struct ctl_table_header *brnf_sysctl_header; | |
56 | static int brnf_call_iptables __read_mostly = 1; | |
57 | static int brnf_call_ip6tables __read_mostly = 1; | |
58 | static int brnf_call_arptables __read_mostly = 1; | |
59 | static int brnf_filter_vlan_tagged __read_mostly; | |
60 | static int brnf_filter_pppoe_tagged __read_mostly; | |
61 | static int brnf_pass_vlan_indev __read_mostly; | |
62 | #else | |
63 | #define brnf_call_iptables 1 | |
64 | #define brnf_call_ip6tables 1 | |
65 | #define brnf_call_arptables 1 | |
66 | #define brnf_filter_vlan_tagged 0 | |
67 | #define brnf_filter_pppoe_tagged 0 | |
68 | #define brnf_pass_vlan_indev 0 | |
69 | #endif | |
70 | ||
71 | #define IS_IP(skb) \ | |
72 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) | |
73 | ||
74 | #define IS_IPV6(skb) \ | |
75 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) | |
76 | ||
77 | #define IS_ARP(skb) \ | |
78 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) | |
79 | ||
80 | static inline __be16 vlan_proto(const struct sk_buff *skb) | |
81 | { | |
82 | if (skb_vlan_tag_present(skb)) | |
83 | return skb->protocol; | |
84 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
85 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
86 | else | |
87 | return 0; | |
88 | } | |
89 | ||
90 | #define IS_VLAN_IP(skb) \ | |
91 | (vlan_proto(skb) == htons(ETH_P_IP) && \ | |
92 | brnf_filter_vlan_tagged) | |
93 | ||
94 | #define IS_VLAN_IPV6(skb) \ | |
95 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ | |
96 | brnf_filter_vlan_tagged) | |
97 | ||
98 | #define IS_VLAN_ARP(skb) \ | |
99 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
100 | brnf_filter_vlan_tagged) | |
101 | ||
102 | static inline __be16 pppoe_proto(const struct sk_buff *skb) | |
103 | { | |
104 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
105 | sizeof(struct pppoe_hdr))); | |
106 | } | |
107 | ||
108 | #define IS_PPPOE_IP(skb) \ | |
109 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
110 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
111 | brnf_filter_pppoe_tagged) | |
112 | ||
113 | #define IS_PPPOE_IPV6(skb) \ | |
114 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
115 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
116 | brnf_filter_pppoe_tagged) | |
117 | ||
118 | /* largest possible L2 header, see br_nf_dev_queue_xmit() */ | |
119 | #define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN) | |
120 | ||
121 | struct brnf_frag_data { | |
122 | char mac[NF_BRIDGE_MAX_MAC_HEADER_LENGTH]; | |
123 | u8 encap_size; | |
124 | u8 size; | |
125 | u16 vlan_tci; | |
126 | __be16 vlan_proto; | |
127 | }; | |
128 | ||
129 | static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage); | |
130 | ||
131 | static void nf_bridge_info_free(struct sk_buff *skb) | |
132 | { | |
133 | if (skb->nf_bridge) { | |
134 | nf_bridge_put(skb->nf_bridge); | |
135 | skb->nf_bridge = NULL; | |
136 | } | |
137 | } | |
138 | ||
139 | static inline struct net_device *bridge_parent(const struct net_device *dev) | |
140 | { | |
141 | struct net_bridge_port *port; | |
142 | ||
143 | port = br_port_get_rcu(dev); | |
144 | return port ? port->br->dev : NULL; | |
145 | } | |
146 | ||
147 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) | |
148 | { | |
149 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
150 | ||
151 | if (atomic_read(&nf_bridge->use) > 1) { | |
152 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
153 | ||
154 | if (tmp) { | |
155 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
156 | atomic_set(&tmp->use, 1); | |
157 | } | |
158 | nf_bridge_put(nf_bridge); | |
159 | nf_bridge = tmp; | |
160 | } | |
161 | return nf_bridge; | |
162 | } | |
163 | ||
164 | unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb) | |
165 | { | |
166 | switch (skb->protocol) { | |
167 | case __cpu_to_be16(ETH_P_8021Q): | |
168 | return VLAN_HLEN; | |
169 | case __cpu_to_be16(ETH_P_PPP_SES): | |
170 | return PPPOE_SES_HLEN; | |
171 | default: | |
172 | return 0; | |
173 | } | |
174 | } | |
175 | ||
176 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
177 | { | |
178 | unsigned int len = nf_bridge_encap_header_len(skb); | |
179 | ||
180 | skb_pull(skb, len); | |
181 | skb->network_header += len; | |
182 | } | |
183 | ||
184 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) | |
185 | { | |
186 | unsigned int len = nf_bridge_encap_header_len(skb); | |
187 | ||
188 | skb_pull_rcsum(skb, len); | |
189 | skb->network_header += len; | |
190 | } | |
191 | ||
192 | /* When handing a packet over to the IP layer | |
193 | * check whether we have a skb that is in the | |
194 | * expected format | |
195 | */ | |
196 | ||
197 | static int br_validate_ipv4(struct net *net, struct sk_buff *skb) | |
198 | { | |
199 | const struct iphdr *iph; | |
200 | u32 len; | |
201 | ||
202 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
203 | goto inhdr_error; | |
204 | ||
205 | iph = ip_hdr(skb); | |
206 | ||
207 | /* Basic sanity checks */ | |
208 | if (iph->ihl < 5 || iph->version != 4) | |
209 | goto inhdr_error; | |
210 | ||
211 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
212 | goto inhdr_error; | |
213 | ||
214 | iph = ip_hdr(skb); | |
215 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
216 | goto inhdr_error; | |
217 | ||
218 | len = ntohs(iph->tot_len); | |
219 | if (skb->len < len) { | |
220 | IP_INC_STATS_BH(net, IPSTATS_MIB_INTRUNCATEDPKTS); | |
221 | goto drop; | |
222 | } else if (len < (iph->ihl*4)) | |
223 | goto inhdr_error; | |
224 | ||
225 | if (pskb_trim_rcsum(skb, len)) { | |
226 | IP_INC_STATS_BH(net, IPSTATS_MIB_INDISCARDS); | |
227 | goto drop; | |
228 | } | |
229 | ||
230 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
231 | /* We should really parse IP options here but until | |
232 | * somebody who actually uses IP options complains to | |
233 | * us we'll just silently ignore the options because | |
234 | * we're lazy! | |
235 | */ | |
236 | return 0; | |
237 | ||
238 | inhdr_error: | |
239 | IP_INC_STATS_BH(net, IPSTATS_MIB_INHDRERRORS); | |
240 | drop: | |
241 | return -1; | |
242 | } | |
243 | ||
244 | void nf_bridge_update_protocol(struct sk_buff *skb) | |
245 | { | |
246 | switch (skb->nf_bridge->orig_proto) { | |
247 | case BRNF_PROTO_8021Q: | |
248 | skb->protocol = htons(ETH_P_8021Q); | |
249 | break; | |
250 | case BRNF_PROTO_PPPOE: | |
251 | skb->protocol = htons(ETH_P_PPP_SES); | |
252 | break; | |
253 | case BRNF_PROTO_UNCHANGED: | |
254 | break; | |
255 | } | |
256 | } | |
257 | ||
258 | /* Obtain the correct destination MAC address, while preserving the original | |
259 | * source MAC address. If we already know this address, we just copy it. If we | |
260 | * don't, we use the neighbour framework to find out. In both cases, we make | |
261 | * sure that br_handle_frame_finish() is called afterwards. | |
262 | */ | |
263 | int br_nf_pre_routing_finish_bridge(struct net *net, struct sock *sk, struct sk_buff *skb) | |
264 | { | |
265 | struct neighbour *neigh; | |
266 | struct dst_entry *dst; | |
267 | ||
268 | skb->dev = bridge_parent(skb->dev); | |
269 | if (!skb->dev) | |
270 | goto free_skb; | |
271 | dst = skb_dst(skb); | |
272 | neigh = dst_neigh_lookup_skb(dst, skb); | |
273 | if (neigh) { | |
274 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
275 | int ret; | |
276 | ||
277 | if (neigh->hh.hh_len) { | |
278 | neigh_hh_bridge(&neigh->hh, skb); | |
279 | skb->dev = nf_bridge->physindev; | |
280 | ret = br_handle_frame_finish(net, sk, skb); | |
281 | } else { | |
282 | /* the neighbour function below overwrites the complete | |
283 | * MAC header, so we save the Ethernet source address and | |
284 | * protocol number. | |
285 | */ | |
286 | skb_copy_from_linear_data_offset(skb, | |
287 | -(ETH_HLEN-ETH_ALEN), | |
288 | nf_bridge->neigh_header, | |
289 | ETH_HLEN-ETH_ALEN); | |
290 | /* tell br_dev_xmit to continue with forwarding */ | |
291 | nf_bridge->bridged_dnat = 1; | |
292 | /* FIXME Need to refragment */ | |
293 | ret = neigh->output(neigh, skb); | |
294 | } | |
295 | neigh_release(neigh); | |
296 | return ret; | |
297 | } | |
298 | free_skb: | |
299 | kfree_skb(skb); | |
300 | return 0; | |
301 | } | |
302 | ||
303 | static inline bool | |
304 | br_nf_ipv4_daddr_was_changed(const struct sk_buff *skb, | |
305 | const struct nf_bridge_info *nf_bridge) | |
306 | { | |
307 | return ip_hdr(skb)->daddr != nf_bridge->ipv4_daddr; | |
308 | } | |
309 | ||
310 | /* This requires some explaining. If DNAT has taken place, | |
311 | * we will need to fix up the destination Ethernet address. | |
312 | * This is also true when SNAT takes place (for the reply direction). | |
313 | * | |
314 | * There are two cases to consider: | |
315 | * 1. The packet was DNAT'ed to a device in the same bridge | |
316 | * port group as it was received on. We can still bridge | |
317 | * the packet. | |
318 | * 2. The packet was DNAT'ed to a different device, either | |
319 | * a non-bridged device or another bridge port group. | |
320 | * The packet will need to be routed. | |
321 | * | |
322 | * The correct way of distinguishing between these two cases is to | |
323 | * call ip_route_input() and to look at skb->dst->dev, which is | |
324 | * changed to the destination device if ip_route_input() succeeds. | |
325 | * | |
326 | * Let's first consider the case that ip_route_input() succeeds: | |
327 | * | |
328 | * If the output device equals the logical bridge device the packet | |
329 | * came in on, we can consider this bridging. The corresponding MAC | |
330 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
331 | * Otherwise, the packet is considered to be routed and we just | |
332 | * change the destination MAC address so that the packet will | |
333 | * later be passed up to the IP stack to be routed. For a redirected | |
334 | * packet, ip_route_input() will give back the localhost as output device, | |
335 | * which differs from the bridge device. | |
336 | * | |
337 | * Let's now consider the case that ip_route_input() fails: | |
338 | * | |
339 | * This can be because the destination address is martian, in which case | |
340 | * the packet will be dropped. | |
341 | * If IP forwarding is disabled, ip_route_input() will fail, while | |
342 | * ip_route_output_key() can return success. The source | |
343 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
344 | * thinks we're handling a locally generated packet and won't care | |
345 | * if IP forwarding is enabled. If the output device equals the logical bridge | |
346 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
347 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
348 | */ | |
349 | static int br_nf_pre_routing_finish(struct net *net, struct sock *sk, struct sk_buff *skb) | |
350 | { | |
351 | struct net_device *dev = skb->dev; | |
352 | struct iphdr *iph = ip_hdr(skb); | |
353 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
354 | struct rtable *rt; | |
355 | int err; | |
356 | ||
357 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; | |
358 | ||
359 | if (nf_bridge->pkt_otherhost) { | |
360 | skb->pkt_type = PACKET_OTHERHOST; | |
361 | nf_bridge->pkt_otherhost = false; | |
362 | } | |
363 | nf_bridge->in_prerouting = 0; | |
364 | if (br_nf_ipv4_daddr_was_changed(skb, nf_bridge)) { | |
365 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { | |
366 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
367 | ||
368 | /* If err equals -EHOSTUNREACH the error is due to a | |
369 | * martian destination or due to the fact that | |
370 | * forwarding is disabled. For most martian packets, | |
371 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
372 | * martian destinations: loopback destinations and destination | |
373 | * 0.0.0.0. In both cases the packet will be dropped because the | |
374 | * destination is the loopback device and not the bridge. */ | |
375 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
376 | goto free_skb; | |
377 | ||
378 | rt = ip_route_output(net, iph->daddr, 0, | |
379 | RT_TOS(iph->tos), 0); | |
380 | if (!IS_ERR(rt)) { | |
381 | /* - Bridged-and-DNAT'ed traffic doesn't | |
382 | * require ip_forwarding. */ | |
383 | if (rt->dst.dev == dev) { | |
384 | skb_dst_set(skb, &rt->dst); | |
385 | goto bridged_dnat; | |
386 | } | |
387 | ip_rt_put(rt); | |
388 | } | |
389 | free_skb: | |
390 | kfree_skb(skb); | |
391 | return 0; | |
392 | } else { | |
393 | if (skb_dst(skb)->dev == dev) { | |
394 | bridged_dnat: | |
395 | skb->dev = nf_bridge->physindev; | |
396 | nf_bridge_update_protocol(skb); | |
397 | nf_bridge_push_encap_header(skb); | |
398 | NF_HOOK_THRESH(NFPROTO_BRIDGE, | |
399 | NF_BR_PRE_ROUTING, | |
400 | net, sk, skb, skb->dev, NULL, | |
401 | br_nf_pre_routing_finish_bridge, | |
402 | 1); | |
403 | return 0; | |
404 | } | |
405 | ether_addr_copy(eth_hdr(skb)->h_dest, dev->dev_addr); | |
406 | skb->pkt_type = PACKET_HOST; | |
407 | } | |
408 | } else { | |
409 | rt = bridge_parent_rtable(nf_bridge->physindev); | |
410 | if (!rt) { | |
411 | kfree_skb(skb); | |
412 | return 0; | |
413 | } | |
414 | skb_dst_set_noref(skb, &rt->dst); | |
415 | } | |
416 | ||
417 | skb->dev = nf_bridge->physindev; | |
418 | nf_bridge_update_protocol(skb); | |
419 | nf_bridge_push_encap_header(skb); | |
420 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_PRE_ROUTING, net, sk, skb, | |
421 | skb->dev, NULL, | |
422 | br_handle_frame_finish, 1); | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) | |
428 | { | |
429 | struct net_device *vlan, *br; | |
430 | ||
431 | br = bridge_parent(dev); | |
432 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) | |
433 | return br; | |
434 | ||
435 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, | |
436 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); | |
437 | ||
438 | return vlan ? vlan : br; | |
439 | } | |
440 | ||
441 | /* Some common code for IPv4/IPv6 */ | |
442 | struct net_device *setup_pre_routing(struct sk_buff *skb) | |
443 | { | |
444 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
445 | ||
446 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
447 | skb->pkt_type = PACKET_HOST; | |
448 | nf_bridge->pkt_otherhost = true; | |
449 | } | |
450 | ||
451 | nf_bridge->in_prerouting = 1; | |
452 | nf_bridge->physindev = skb->dev; | |
453 | skb->dev = brnf_get_logical_dev(skb, skb->dev); | |
454 | ||
455 | if (skb->protocol == htons(ETH_P_8021Q)) | |
456 | nf_bridge->orig_proto = BRNF_PROTO_8021Q; | |
457 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
458 | nf_bridge->orig_proto = BRNF_PROTO_PPPOE; | |
459 | ||
460 | /* Must drop socket now because of tproxy. */ | |
461 | skb_orphan(skb); | |
462 | return skb->dev; | |
463 | } | |
464 | ||
465 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
466 | * Replicate the checks that IPv4 does on packet reception. | |
467 | * Set skb->dev to the bridge device (i.e. parent of the | |
468 | * receiving device) to make netfilter happy, the REDIRECT | |
469 | * target in particular. Save the original destination IP | |
470 | * address to be able to detect DNAT afterwards. */ | |
471 | static unsigned int br_nf_pre_routing(void *priv, | |
472 | struct sk_buff *skb, | |
473 | const struct nf_hook_state *state) | |
474 | { | |
475 | struct nf_bridge_info *nf_bridge; | |
476 | struct net_bridge_port *p; | |
477 | struct net_bridge *br; | |
478 | __u32 len = nf_bridge_encap_header_len(skb); | |
479 | ||
480 | if (unlikely(!pskb_may_pull(skb, len))) | |
481 | return NF_DROP; | |
482 | ||
483 | p = br_port_get_rcu(state->in); | |
484 | if (p == NULL) | |
485 | return NF_DROP; | |
486 | br = p->br; | |
487 | ||
488 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { | |
489 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) | |
490 | return NF_ACCEPT; | |
491 | ||
492 | nf_bridge_pull_encap_header_rcsum(skb); | |
493 | return br_nf_pre_routing_ipv6(priv, skb, state); | |
494 | } | |
495 | ||
496 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
497 | return NF_ACCEPT; | |
498 | ||
499 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) | |
500 | return NF_ACCEPT; | |
501 | ||
502 | nf_bridge_pull_encap_header_rcsum(skb); | |
503 | ||
504 | if (br_validate_ipv4(state->net, skb)) | |
505 | return NF_DROP; | |
506 | ||
507 | nf_bridge_put(skb->nf_bridge); | |
508 | if (!nf_bridge_alloc(skb)) | |
509 | return NF_DROP; | |
510 | if (!setup_pre_routing(skb)) | |
511 | return NF_DROP; | |
512 | ||
513 | nf_bridge = nf_bridge_info_get(skb); | |
514 | nf_bridge->ipv4_daddr = ip_hdr(skb)->daddr; | |
515 | ||
516 | skb->protocol = htons(ETH_P_IP); | |
517 | ||
518 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, state->net, state->sk, skb, | |
519 | skb->dev, NULL, | |
520 | br_nf_pre_routing_finish); | |
521 | ||
522 | return NF_STOLEN; | |
523 | } | |
524 | ||
525 | ||
526 | /* PF_BRIDGE/LOCAL_IN ************************************************/ | |
527 | /* The packet is locally destined, which requires a real | |
528 | * dst_entry, so detach the fake one. On the way up, the | |
529 | * packet would pass through PRE_ROUTING again (which already | |
530 | * took place when the packet entered the bridge), but we | |
531 | * register an IPv4 PRE_ROUTING 'sabotage' hook that will | |
532 | * prevent this from happening. */ | |
533 | static unsigned int br_nf_local_in(void *priv, | |
534 | struct sk_buff *skb, | |
535 | const struct nf_hook_state *state) | |
536 | { | |
537 | br_drop_fake_rtable(skb); | |
538 | return NF_ACCEPT; | |
539 | } | |
540 | ||
541 | /* PF_BRIDGE/FORWARD *************************************************/ | |
542 | static int br_nf_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb) | |
543 | { | |
544 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
545 | struct net_device *in; | |
546 | ||
547 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { | |
548 | ||
549 | if (skb->protocol == htons(ETH_P_IP)) | |
550 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; | |
551 | ||
552 | if (skb->protocol == htons(ETH_P_IPV6)) | |
553 | nf_bridge->frag_max_size = IP6CB(skb)->frag_max_size; | |
554 | ||
555 | in = nf_bridge->physindev; | |
556 | if (nf_bridge->pkt_otherhost) { | |
557 | skb->pkt_type = PACKET_OTHERHOST; | |
558 | nf_bridge->pkt_otherhost = false; | |
559 | } | |
560 | nf_bridge_update_protocol(skb); | |
561 | } else { | |
562 | in = *((struct net_device **)(skb->cb)); | |
563 | } | |
564 | nf_bridge_push_encap_header(skb); | |
565 | ||
566 | NF_HOOK_THRESH(NFPROTO_BRIDGE, NF_BR_FORWARD, net, sk, skb, | |
567 | in, skb->dev, br_forward_finish, 1); | |
568 | return 0; | |
569 | } | |
570 | ||
571 | ||
572 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
573 | * netfilter with indev and outdev set to the bridge device, | |
574 | * but we are still able to filter on the 'real' indev/outdev | |
575 | * because of the physdev module. For ARP, indev and outdev are the | |
576 | * bridge ports. */ | |
577 | static unsigned int br_nf_forward_ip(void *priv, | |
578 | struct sk_buff *skb, | |
579 | const struct nf_hook_state *state) | |
580 | { | |
581 | struct nf_bridge_info *nf_bridge; | |
582 | struct net_device *parent; | |
583 | u_int8_t pf; | |
584 | ||
585 | if (!skb->nf_bridge) | |
586 | return NF_ACCEPT; | |
587 | ||
588 | /* Need exclusive nf_bridge_info since we might have multiple | |
589 | * different physoutdevs. */ | |
590 | if (!nf_bridge_unshare(skb)) | |
591 | return NF_DROP; | |
592 | ||
593 | nf_bridge = nf_bridge_info_get(skb); | |
594 | if (!nf_bridge) | |
595 | return NF_DROP; | |
596 | ||
597 | parent = bridge_parent(state->out); | |
598 | if (!parent) | |
599 | return NF_DROP; | |
600 | ||
601 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) | |
602 | pf = NFPROTO_IPV4; | |
603 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) | |
604 | pf = NFPROTO_IPV6; | |
605 | else | |
606 | return NF_ACCEPT; | |
607 | ||
608 | nf_bridge_pull_encap_header(skb); | |
609 | ||
610 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
611 | skb->pkt_type = PACKET_HOST; | |
612 | nf_bridge->pkt_otherhost = true; | |
613 | } | |
614 | ||
615 | if (pf == NFPROTO_IPV4) { | |
616 | if (br_validate_ipv4(state->net, skb)) | |
617 | return NF_DROP; | |
618 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
619 | } | |
620 | ||
621 | if (pf == NFPROTO_IPV6) { | |
622 | if (br_validate_ipv6(state->net, skb)) | |
623 | return NF_DROP; | |
624 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
625 | } | |
626 | ||
627 | nf_bridge->physoutdev = skb->dev; | |
628 | if (pf == NFPROTO_IPV4) | |
629 | skb->protocol = htons(ETH_P_IP); | |
630 | else | |
631 | skb->protocol = htons(ETH_P_IPV6); | |
632 | ||
633 | NF_HOOK(pf, NF_INET_FORWARD, state->net, NULL, skb, | |
634 | brnf_get_logical_dev(skb, state->in), | |
635 | parent, br_nf_forward_finish); | |
636 | ||
637 | return NF_STOLEN; | |
638 | } | |
639 | ||
640 | static unsigned int br_nf_forward_arp(void *priv, | |
641 | struct sk_buff *skb, | |
642 | const struct nf_hook_state *state) | |
643 | { | |
644 | struct net_bridge_port *p; | |
645 | struct net_bridge *br; | |
646 | struct net_device **d = (struct net_device **)(skb->cb); | |
647 | ||
648 | p = br_port_get_rcu(state->out); | |
649 | if (p == NULL) | |
650 | return NF_ACCEPT; | |
651 | br = p->br; | |
652 | ||
653 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
654 | return NF_ACCEPT; | |
655 | ||
656 | if (!IS_ARP(skb)) { | |
657 | if (!IS_VLAN_ARP(skb)) | |
658 | return NF_ACCEPT; | |
659 | nf_bridge_pull_encap_header(skb); | |
660 | } | |
661 | ||
662 | if (arp_hdr(skb)->ar_pln != 4) { | |
663 | if (IS_VLAN_ARP(skb)) | |
664 | nf_bridge_push_encap_header(skb); | |
665 | return NF_ACCEPT; | |
666 | } | |
667 | *d = state->in; | |
668 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, state->net, state->sk, skb, | |
669 | state->in, state->out, br_nf_forward_finish); | |
670 | ||
671 | return NF_STOLEN; | |
672 | } | |
673 | ||
674 | static int br_nf_push_frag_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) | |
675 | { | |
676 | struct brnf_frag_data *data; | |
677 | int err; | |
678 | ||
679 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
680 | err = skb_cow_head(skb, data->size); | |
681 | ||
682 | if (err) { | |
683 | kfree_skb(skb); | |
684 | return 0; | |
685 | } | |
686 | ||
687 | if (data->vlan_tci) { | |
688 | skb->vlan_tci = data->vlan_tci; | |
689 | skb->vlan_proto = data->vlan_proto; | |
690 | } | |
691 | ||
692 | skb_copy_to_linear_data_offset(skb, -data->size, data->mac, data->size); | |
693 | __skb_push(skb, data->encap_size); | |
694 | ||
695 | nf_bridge_info_free(skb); | |
696 | return br_dev_queue_push_xmit(net, sk, skb); | |
697 | } | |
698 | ||
699 | static int | |
700 | br_nf_ip_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, | |
701 | int (*output)(struct net *, struct sock *, struct sk_buff *)) | |
702 | { | |
703 | unsigned int mtu = ip_skb_dst_mtu(skb); | |
704 | struct iphdr *iph = ip_hdr(skb); | |
705 | ||
706 | if (unlikely(((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) || | |
707 | (IPCB(skb)->frag_max_size && | |
708 | IPCB(skb)->frag_max_size > mtu))) { | |
709 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); | |
710 | kfree_skb(skb); | |
711 | return -EMSGSIZE; | |
712 | } | |
713 | ||
714 | return ip_do_fragment(net, sk, skb, output); | |
715 | } | |
716 | ||
717 | static unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb) | |
718 | { | |
719 | if (skb->nf_bridge->orig_proto == BRNF_PROTO_PPPOE) | |
720 | return PPPOE_SES_HLEN; | |
721 | return 0; | |
722 | } | |
723 | ||
724 | static int br_nf_dev_queue_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) | |
725 | { | |
726 | struct nf_bridge_info *nf_bridge; | |
727 | unsigned int mtu_reserved; | |
728 | ||
729 | mtu_reserved = nf_bridge_mtu_reduction(skb); | |
730 | ||
731 | if (skb_is_gso(skb) || skb->len + mtu_reserved <= skb->dev->mtu) { | |
732 | nf_bridge_info_free(skb); | |
733 | return br_dev_queue_push_xmit(net, sk, skb); | |
734 | } | |
735 | ||
736 | nf_bridge = nf_bridge_info_get(skb); | |
737 | ||
738 | /* This is wrong! We should preserve the original fragment | |
739 | * boundaries by preserving frag_list rather than refragmenting. | |
740 | */ | |
741 | if (IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) && | |
742 | skb->protocol == htons(ETH_P_IP)) { | |
743 | struct brnf_frag_data *data; | |
744 | ||
745 | if (br_validate_ipv4(net, skb)) | |
746 | goto drop; | |
747 | ||
748 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
749 | ||
750 | nf_bridge_update_protocol(skb); | |
751 | ||
752 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
753 | ||
754 | data->vlan_tci = skb->vlan_tci; | |
755 | data->vlan_proto = skb->vlan_proto; | |
756 | data->encap_size = nf_bridge_encap_header_len(skb); | |
757 | data->size = ETH_HLEN + data->encap_size; | |
758 | ||
759 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, | |
760 | data->size); | |
761 | ||
762 | return br_nf_ip_fragment(net, sk, skb, br_nf_push_frag_xmit); | |
763 | } | |
764 | if (IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) && | |
765 | skb->protocol == htons(ETH_P_IPV6)) { | |
766 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); | |
767 | struct brnf_frag_data *data; | |
768 | ||
769 | if (br_validate_ipv6(net, skb)) | |
770 | goto drop; | |
771 | ||
772 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
773 | ||
774 | nf_bridge_update_protocol(skb); | |
775 | ||
776 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
777 | data->encap_size = nf_bridge_encap_header_len(skb); | |
778 | data->size = ETH_HLEN + data->encap_size; | |
779 | ||
780 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, | |
781 | data->size); | |
782 | ||
783 | if (v6ops) | |
784 | return v6ops->fragment(net, sk, skb, br_nf_push_frag_xmit); | |
785 | ||
786 | kfree_skb(skb); | |
787 | return -EMSGSIZE; | |
788 | } | |
789 | nf_bridge_info_free(skb); | |
790 | return br_dev_queue_push_xmit(net, sk, skb); | |
791 | drop: | |
792 | kfree_skb(skb); | |
793 | return 0; | |
794 | } | |
795 | ||
796 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
797 | static unsigned int br_nf_post_routing(void *priv, | |
798 | struct sk_buff *skb, | |
799 | const struct nf_hook_state *state) | |
800 | { | |
801 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
802 | struct net_device *realoutdev = bridge_parent(skb->dev); | |
803 | u_int8_t pf; | |
804 | ||
805 | /* if nf_bridge is set, but ->physoutdev is NULL, this packet came in | |
806 | * on a bridge, but was delivered locally and is now being routed: | |
807 | * | |
808 | * POST_ROUTING was already invoked from the ip stack. | |
809 | */ | |
810 | if (!nf_bridge || !nf_bridge->physoutdev) | |
811 | return NF_ACCEPT; | |
812 | ||
813 | if (!realoutdev) | |
814 | return NF_DROP; | |
815 | ||
816 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) | |
817 | pf = NFPROTO_IPV4; | |
818 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) | |
819 | pf = NFPROTO_IPV6; | |
820 | else | |
821 | return NF_ACCEPT; | |
822 | ||
823 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
824 | * about the value of skb->pkt_type. */ | |
825 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
826 | skb->pkt_type = PACKET_HOST; | |
827 | nf_bridge->pkt_otherhost = true; | |
828 | } | |
829 | ||
830 | nf_bridge_pull_encap_header(skb); | |
831 | if (pf == NFPROTO_IPV4) | |
832 | skb->protocol = htons(ETH_P_IP); | |
833 | else | |
834 | skb->protocol = htons(ETH_P_IPV6); | |
835 | ||
836 | NF_HOOK(pf, NF_INET_POST_ROUTING, state->net, state->sk, skb, | |
837 | NULL, realoutdev, | |
838 | br_nf_dev_queue_xmit); | |
839 | ||
840 | return NF_STOLEN; | |
841 | } | |
842 | ||
843 | /* IP/SABOTAGE *****************************************************/ | |
844 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
845 | * for the second time. */ | |
846 | static unsigned int ip_sabotage_in(void *priv, | |
847 | struct sk_buff *skb, | |
848 | const struct nf_hook_state *state) | |
849 | { | |
850 | if (skb->nf_bridge && !skb->nf_bridge->in_prerouting) | |
851 | return NF_STOP; | |
852 | ||
853 | return NF_ACCEPT; | |
854 | } | |
855 | ||
856 | /* This is called when br_netfilter has called into iptables/netfilter, | |
857 | * and DNAT has taken place on a bridge-forwarded packet. | |
858 | * | |
859 | * neigh->output has created a new MAC header, with local br0 MAC | |
860 | * as saddr. | |
861 | * | |
862 | * This restores the original MAC saddr of the bridged packet | |
863 | * before invoking bridge forward logic to transmit the packet. | |
864 | */ | |
865 | static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) | |
866 | { | |
867 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
868 | ||
869 | skb_pull(skb, ETH_HLEN); | |
870 | nf_bridge->bridged_dnat = 0; | |
871 | ||
872 | BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN)); | |
873 | ||
874 | skb_copy_to_linear_data_offset(skb, -(ETH_HLEN - ETH_ALEN), | |
875 | nf_bridge->neigh_header, | |
876 | ETH_HLEN - ETH_ALEN); | |
877 | skb->dev = nf_bridge->physindev; | |
878 | ||
879 | nf_bridge->physoutdev = NULL; | |
880 | br_handle_frame_finish(dev_net(skb->dev), NULL, skb); | |
881 | } | |
882 | ||
883 | static int br_nf_dev_xmit(struct sk_buff *skb) | |
884 | { | |
885 | if (skb->nf_bridge && skb->nf_bridge->bridged_dnat) { | |
886 | br_nf_pre_routing_finish_bridge_slow(skb); | |
887 | return 1; | |
888 | } | |
889 | return 0; | |
890 | } | |
891 | ||
892 | static const struct nf_br_ops br_ops = { | |
893 | .br_dev_xmit_hook = br_nf_dev_xmit, | |
894 | }; | |
895 | ||
896 | void br_netfilter_enable(void) | |
897 | { | |
898 | } | |
899 | EXPORT_SYMBOL_GPL(br_netfilter_enable); | |
900 | ||
901 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
902 | * br_dev_queue_push_xmit is called afterwards */ | |
903 | static struct nf_hook_ops br_nf_ops[] __read_mostly = { | |
904 | { | |
905 | .hook = br_nf_pre_routing, | |
906 | .pf = NFPROTO_BRIDGE, | |
907 | .hooknum = NF_BR_PRE_ROUTING, | |
908 | .priority = NF_BR_PRI_BRNF, | |
909 | }, | |
910 | { | |
911 | .hook = br_nf_local_in, | |
912 | .pf = NFPROTO_BRIDGE, | |
913 | .hooknum = NF_BR_LOCAL_IN, | |
914 | .priority = NF_BR_PRI_BRNF, | |
915 | }, | |
916 | { | |
917 | .hook = br_nf_forward_ip, | |
918 | .pf = NFPROTO_BRIDGE, | |
919 | .hooknum = NF_BR_FORWARD, | |
920 | .priority = NF_BR_PRI_BRNF - 1, | |
921 | }, | |
922 | { | |
923 | .hook = br_nf_forward_arp, | |
924 | .pf = NFPROTO_BRIDGE, | |
925 | .hooknum = NF_BR_FORWARD, | |
926 | .priority = NF_BR_PRI_BRNF, | |
927 | }, | |
928 | { | |
929 | .hook = br_nf_post_routing, | |
930 | .pf = NFPROTO_BRIDGE, | |
931 | .hooknum = NF_BR_POST_ROUTING, | |
932 | .priority = NF_BR_PRI_LAST, | |
933 | }, | |
934 | { | |
935 | .hook = ip_sabotage_in, | |
936 | .pf = NFPROTO_IPV4, | |
937 | .hooknum = NF_INET_PRE_ROUTING, | |
938 | .priority = NF_IP_PRI_FIRST, | |
939 | }, | |
940 | { | |
941 | .hook = ip_sabotage_in, | |
942 | .pf = NFPROTO_IPV6, | |
943 | .hooknum = NF_INET_PRE_ROUTING, | |
944 | .priority = NF_IP6_PRI_FIRST, | |
945 | }, | |
946 | }; | |
947 | ||
948 | static int brnf_device_event(struct notifier_block *unused, unsigned long event, | |
949 | void *ptr) | |
950 | { | |
951 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
952 | struct brnf_net *brnet; | |
953 | struct net *net; | |
954 | int ret; | |
955 | ||
956 | if (event != NETDEV_REGISTER || !(dev->priv_flags & IFF_EBRIDGE)) | |
957 | return NOTIFY_DONE; | |
958 | ||
959 | ASSERT_RTNL(); | |
960 | ||
961 | net = dev_net(dev); | |
962 | brnet = net_generic(net, brnf_net_id); | |
963 | if (brnet->enabled) | |
964 | return NOTIFY_OK; | |
965 | ||
966 | ret = nf_register_net_hooks(net, br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
967 | if (ret) | |
968 | return NOTIFY_BAD; | |
969 | ||
970 | brnet->enabled = true; | |
971 | return NOTIFY_OK; | |
972 | } | |
973 | ||
974 | static void __net_exit brnf_exit_net(struct net *net) | |
975 | { | |
976 | struct brnf_net *brnet = net_generic(net, brnf_net_id); | |
977 | ||
978 | if (!brnet->enabled) | |
979 | return; | |
980 | ||
981 | nf_unregister_net_hooks(net, br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
982 | brnet->enabled = false; | |
983 | } | |
984 | ||
985 | static struct pernet_operations brnf_net_ops __read_mostly = { | |
986 | .exit = brnf_exit_net, | |
987 | .id = &brnf_net_id, | |
988 | .size = sizeof(struct brnf_net), | |
989 | }; | |
990 | ||
991 | static struct notifier_block brnf_notifier __read_mostly = { | |
992 | .notifier_call = brnf_device_event, | |
993 | }; | |
994 | ||
995 | #ifdef CONFIG_SYSCTL | |
996 | static | |
997 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, | |
998 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
999 | { | |
1000 | int ret; | |
1001 | ||
1002 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
1003 | ||
1004 | if (write && *(int *)(ctl->data)) | |
1005 | *(int *)(ctl->data) = 1; | |
1006 | return ret; | |
1007 | } | |
1008 | ||
1009 | static struct ctl_table brnf_table[] = { | |
1010 | { | |
1011 | .procname = "bridge-nf-call-arptables", | |
1012 | .data = &brnf_call_arptables, | |
1013 | .maxlen = sizeof(int), | |
1014 | .mode = 0644, | |
1015 | .proc_handler = brnf_sysctl_call_tables, | |
1016 | }, | |
1017 | { | |
1018 | .procname = "bridge-nf-call-iptables", | |
1019 | .data = &brnf_call_iptables, | |
1020 | .maxlen = sizeof(int), | |
1021 | .mode = 0644, | |
1022 | .proc_handler = brnf_sysctl_call_tables, | |
1023 | }, | |
1024 | { | |
1025 | .procname = "bridge-nf-call-ip6tables", | |
1026 | .data = &brnf_call_ip6tables, | |
1027 | .maxlen = sizeof(int), | |
1028 | .mode = 0644, | |
1029 | .proc_handler = brnf_sysctl_call_tables, | |
1030 | }, | |
1031 | { | |
1032 | .procname = "bridge-nf-filter-vlan-tagged", | |
1033 | .data = &brnf_filter_vlan_tagged, | |
1034 | .maxlen = sizeof(int), | |
1035 | .mode = 0644, | |
1036 | .proc_handler = brnf_sysctl_call_tables, | |
1037 | }, | |
1038 | { | |
1039 | .procname = "bridge-nf-filter-pppoe-tagged", | |
1040 | .data = &brnf_filter_pppoe_tagged, | |
1041 | .maxlen = sizeof(int), | |
1042 | .mode = 0644, | |
1043 | .proc_handler = brnf_sysctl_call_tables, | |
1044 | }, | |
1045 | { | |
1046 | .procname = "bridge-nf-pass-vlan-input-dev", | |
1047 | .data = &brnf_pass_vlan_indev, | |
1048 | .maxlen = sizeof(int), | |
1049 | .mode = 0644, | |
1050 | .proc_handler = brnf_sysctl_call_tables, | |
1051 | }, | |
1052 | { } | |
1053 | }; | |
1054 | #endif | |
1055 | ||
1056 | static int __init br_netfilter_init(void) | |
1057 | { | |
1058 | int ret; | |
1059 | ||
1060 | ret = register_pernet_subsys(&brnf_net_ops); | |
1061 | if (ret < 0) | |
1062 | return ret; | |
1063 | ||
1064 | ret = register_netdevice_notifier(&brnf_notifier); | |
1065 | if (ret < 0) { | |
1066 | unregister_pernet_subsys(&brnf_net_ops); | |
1067 | return ret; | |
1068 | } | |
1069 | ||
1070 | #ifdef CONFIG_SYSCTL | |
1071 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); | |
1072 | if (brnf_sysctl_header == NULL) { | |
1073 | printk(KERN_WARNING | |
1074 | "br_netfilter: can't register to sysctl.\n"); | |
1075 | unregister_netdevice_notifier(&brnf_notifier); | |
1076 | unregister_pernet_subsys(&brnf_net_ops); | |
1077 | return -ENOMEM; | |
1078 | } | |
1079 | #endif | |
1080 | RCU_INIT_POINTER(nf_br_ops, &br_ops); | |
1081 | printk(KERN_NOTICE "Bridge firewalling registered\n"); | |
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | static void __exit br_netfilter_fini(void) | |
1086 | { | |
1087 | RCU_INIT_POINTER(nf_br_ops, NULL); | |
1088 | unregister_netdevice_notifier(&brnf_notifier); | |
1089 | unregister_pernet_subsys(&brnf_net_ops); | |
1090 | #ifdef CONFIG_SYSCTL | |
1091 | unregister_net_sysctl_table(brnf_sysctl_header); | |
1092 | #endif | |
1093 | } | |
1094 | ||
1095 | module_init(br_netfilter_init); | |
1096 | module_exit(br_netfilter_fini); | |
1097 | ||
1098 | MODULE_LICENSE("GPL"); | |
1099 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); | |
1100 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); | |
1101 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |