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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/rculist.h> | |
34 | #include <linux/inetdevice.h> | |
35 | ||
36 | #include <net/ip.h> | |
37 | #include <net/ipv6.h> | |
38 | #include <net/addrconf.h> | |
39 | #include <net/route.h> | |
40 | #include <net/netfilter/br_netfilter.h> | |
41 | #include <net/netns/generic.h> | |
42 | ||
43 | #include <linux/uaccess.h> | |
44 | #include "br_private.h" | |
45 | #ifdef CONFIG_SYSCTL | |
46 | #include <linux/sysctl.h> | |
47 | #endif | |
48 | ||
49 | static unsigned int brnf_net_id __read_mostly; | |
50 | ||
51 | struct brnf_net { | |
52 | bool enabled; | |
53 | }; | |
54 | ||
55 | #ifdef CONFIG_SYSCTL | |
56 | static struct ctl_table_header *brnf_sysctl_header; | |
57 | static int brnf_call_iptables __read_mostly = 1; | |
58 | static int brnf_call_ip6tables __read_mostly = 1; | |
59 | static int brnf_call_arptables __read_mostly = 1; | |
60 | static int brnf_filter_vlan_tagged __read_mostly; | |
61 | static int brnf_filter_pppoe_tagged __read_mostly; | |
62 | static int brnf_pass_vlan_indev __read_mostly; | |
63 | #else | |
64 | #define brnf_call_iptables 1 | |
65 | #define brnf_call_ip6tables 1 | |
66 | #define brnf_call_arptables 1 | |
67 | #define brnf_filter_vlan_tagged 0 | |
68 | #define brnf_filter_pppoe_tagged 0 | |
69 | #define brnf_pass_vlan_indev 0 | |
70 | #endif | |
71 | ||
72 | #define IS_IP(skb) \ | |
73 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IP)) | |
74 | ||
75 | #define IS_IPV6(skb) \ | |
76 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_IPV6)) | |
77 | ||
78 | #define IS_ARP(skb) \ | |
79 | (!skb_vlan_tag_present(skb) && skb->protocol == htons(ETH_P_ARP)) | |
80 | ||
81 | static inline __be16 vlan_proto(const struct sk_buff *skb) | |
82 | { | |
83 | if (skb_vlan_tag_present(skb)) | |
84 | return skb->protocol; | |
85 | else if (skb->protocol == htons(ETH_P_8021Q)) | |
86 | return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto; | |
87 | else | |
88 | return 0; | |
89 | } | |
90 | ||
91 | #define IS_VLAN_IP(skb) \ | |
92 | (vlan_proto(skb) == htons(ETH_P_IP) && \ | |
93 | brnf_filter_vlan_tagged) | |
94 | ||
95 | #define IS_VLAN_IPV6(skb) \ | |
96 | (vlan_proto(skb) == htons(ETH_P_IPV6) && \ | |
97 | brnf_filter_vlan_tagged) | |
98 | ||
99 | #define IS_VLAN_ARP(skb) \ | |
100 | (vlan_proto(skb) == htons(ETH_P_ARP) && \ | |
101 | brnf_filter_vlan_tagged) | |
102 | ||
103 | static inline __be16 pppoe_proto(const struct sk_buff *skb) | |
104 | { | |
105 | return *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
106 | sizeof(struct pppoe_hdr))); | |
107 | } | |
108 | ||
109 | #define IS_PPPOE_IP(skb) \ | |
110 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
111 | pppoe_proto(skb) == htons(PPP_IP) && \ | |
112 | brnf_filter_pppoe_tagged) | |
113 | ||
114 | #define IS_PPPOE_IPV6(skb) \ | |
115 | (skb->protocol == htons(ETH_P_PPP_SES) && \ | |
116 | pppoe_proto(skb) == htons(PPP_IPV6) && \ | |
117 | brnf_filter_pppoe_tagged) | |
118 | ||
119 | /* largest possible L2 header, see br_nf_dev_queue_xmit() */ | |
120 | #define NF_BRIDGE_MAX_MAC_HEADER_LENGTH (PPPOE_SES_HLEN + ETH_HLEN) | |
121 | ||
122 | struct brnf_frag_data { | |
123 | char mac[NF_BRIDGE_MAX_MAC_HEADER_LENGTH]; | |
124 | u8 encap_size; | |
125 | u8 size; | |
126 | u16 vlan_tci; | |
127 | __be16 vlan_proto; | |
128 | }; | |
129 | ||
130 | static DEFINE_PER_CPU(struct brnf_frag_data, brnf_frag_data_storage); | |
131 | ||
132 | static void nf_bridge_info_free(struct sk_buff *skb) | |
133 | { | |
134 | if (skb->nf_bridge) { | |
135 | nf_bridge_put(skb->nf_bridge); | |
136 | skb->nf_bridge = NULL; | |
137 | } | |
138 | } | |
139 | ||
140 | static inline struct net_device *bridge_parent(const struct net_device *dev) | |
141 | { | |
142 | struct net_bridge_port *port; | |
143 | ||
144 | port = br_port_get_rcu(dev); | |
145 | return port ? port->br->dev : NULL; | |
146 | } | |
147 | ||
148 | static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb) | |
149 | { | |
150 | struct nf_bridge_info *nf_bridge = skb->nf_bridge; | |
151 | ||
152 | if (refcount_read(&nf_bridge->use) > 1) { | |
153 | struct nf_bridge_info *tmp = nf_bridge_alloc(skb); | |
154 | ||
155 | if (tmp) { | |
156 | memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info)); | |
157 | refcount_set(&tmp->use, 1); | |
158 | } | |
159 | nf_bridge_put(nf_bridge); | |
160 | nf_bridge = tmp; | |
161 | } | |
162 | return nf_bridge; | |
163 | } | |
164 | ||
165 | unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb) | |
166 | { | |
167 | switch (skb->protocol) { | |
168 | case __cpu_to_be16(ETH_P_8021Q): | |
169 | return VLAN_HLEN; | |
170 | case __cpu_to_be16(ETH_P_PPP_SES): | |
171 | return PPPOE_SES_HLEN; | |
172 | default: | |
173 | return 0; | |
174 | } | |
175 | } | |
176 | ||
177 | static inline void nf_bridge_pull_encap_header(struct sk_buff *skb) | |
178 | { | |
179 | unsigned int len = nf_bridge_encap_header_len(skb); | |
180 | ||
181 | skb_pull(skb, len); | |
182 | skb->network_header += len; | |
183 | } | |
184 | ||
185 | static inline void nf_bridge_pull_encap_header_rcsum(struct sk_buff *skb) | |
186 | { | |
187 | unsigned int len = nf_bridge_encap_header_len(skb); | |
188 | ||
189 | skb_pull_rcsum(skb, len); | |
190 | skb->network_header += len; | |
191 | } | |
192 | ||
193 | /* When handing a packet over to the IP layer | |
194 | * check whether we have a skb that is in the | |
195 | * expected format | |
196 | */ | |
197 | ||
198 | static int br_validate_ipv4(struct net *net, struct sk_buff *skb) | |
199 | { | |
200 | const struct iphdr *iph; | |
201 | u32 len; | |
202 | ||
203 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
204 | goto inhdr_error; | |
205 | ||
206 | iph = ip_hdr(skb); | |
207 | ||
208 | /* Basic sanity checks */ | |
209 | if (iph->ihl < 5 || iph->version != 4) | |
210 | goto inhdr_error; | |
211 | ||
212 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
213 | goto inhdr_error; | |
214 | ||
215 | iph = ip_hdr(skb); | |
216 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
217 | goto inhdr_error; | |
218 | ||
219 | len = ntohs(iph->tot_len); | |
220 | if (skb->len < len) { | |
221 | __IP_INC_STATS(net, IPSTATS_MIB_INTRUNCATEDPKTS); | |
222 | goto drop; | |
223 | } else if (len < (iph->ihl*4)) | |
224 | goto inhdr_error; | |
225 | ||
226 | if (pskb_trim_rcsum(skb, len)) { | |
227 | __IP_INC_STATS(net, IPSTATS_MIB_INDISCARDS); | |
228 | goto drop; | |
229 | } | |
230 | ||
231 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); | |
232 | /* We should really parse IP options here but until | |
233 | * somebody who actually uses IP options complains to | |
234 | * us we'll just silently ignore the options because | |
235 | * we're lazy! | |
236 | */ | |
237 | return 0; | |
238 | ||
239 | inhdr_error: | |
240 | __IP_INC_STATS(net, IPSTATS_MIB_INHDRERRORS); | |
241 | drop: | |
242 | return -1; | |
243 | } | |
244 | ||
245 | void nf_bridge_update_protocol(struct sk_buff *skb) | |
246 | { | |
247 | switch (skb->nf_bridge->orig_proto) { | |
248 | case BRNF_PROTO_8021Q: | |
249 | skb->protocol = htons(ETH_P_8021Q); | |
250 | break; | |
251 | case BRNF_PROTO_PPPOE: | |
252 | skb->protocol = htons(ETH_P_PPP_SES); | |
253 | break; | |
254 | case BRNF_PROTO_UNCHANGED: | |
255 | break; | |
256 | } | |
257 | } | |
258 | ||
259 | /* Obtain the correct destination MAC address, while preserving the original | |
260 | * source MAC address. If we already know this address, we just copy it. If we | |
261 | * don't, we use the neighbour framework to find out. In both cases, we make | |
262 | * sure that br_handle_frame_finish() is called afterwards. | |
263 | */ | |
264 | int br_nf_pre_routing_finish_bridge(struct net *net, struct sock *sk, struct sk_buff *skb) | |
265 | { | |
266 | struct neighbour *neigh; | |
267 | struct dst_entry *dst; | |
268 | ||
269 | skb->dev = bridge_parent(skb->dev); | |
270 | if (!skb->dev) | |
271 | goto free_skb; | |
272 | dst = skb_dst(skb); | |
273 | neigh = dst_neigh_lookup_skb(dst, skb); | |
274 | if (neigh) { | |
275 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
276 | int ret; | |
277 | ||
278 | if (neigh->hh.hh_len) { | |
279 | neigh_hh_bridge(&neigh->hh, skb); | |
280 | skb->dev = nf_bridge->physindev; | |
281 | ret = br_handle_frame_finish(net, sk, skb); | |
282 | } else { | |
283 | /* the neighbour function below overwrites the complete | |
284 | * MAC header, so we save the Ethernet source address and | |
285 | * protocol number. | |
286 | */ | |
287 | skb_copy_from_linear_data_offset(skb, | |
288 | -(ETH_HLEN-ETH_ALEN), | |
289 | nf_bridge->neigh_header, | |
290 | ETH_HLEN-ETH_ALEN); | |
291 | /* tell br_dev_xmit to continue with forwarding */ | |
292 | nf_bridge->bridged_dnat = 1; | |
293 | /* FIXME Need to refragment */ | |
294 | ret = neigh->output(neigh, skb); | |
295 | } | |
296 | neigh_release(neigh); | |
297 | return ret; | |
298 | } | |
299 | free_skb: | |
300 | kfree_skb(skb); | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static inline bool | |
305 | br_nf_ipv4_daddr_was_changed(const struct sk_buff *skb, | |
306 | const struct nf_bridge_info *nf_bridge) | |
307 | { | |
308 | return ip_hdr(skb)->daddr != nf_bridge->ipv4_daddr; | |
309 | } | |
310 | ||
311 | /* This requires some explaining. If DNAT has taken place, | |
312 | * we will need to fix up the destination Ethernet address. | |
313 | * This is also true when SNAT takes place (for the reply direction). | |
314 | * | |
315 | * There are two cases to consider: | |
316 | * 1. The packet was DNAT'ed to a device in the same bridge | |
317 | * port group as it was received on. We can still bridge | |
318 | * the packet. | |
319 | * 2. The packet was DNAT'ed to a different device, either | |
320 | * a non-bridged device or another bridge port group. | |
321 | * The packet will need to be routed. | |
322 | * | |
323 | * The correct way of distinguishing between these two cases is to | |
324 | * call ip_route_input() and to look at skb->dst->dev, which is | |
325 | * changed to the destination device if ip_route_input() succeeds. | |
326 | * | |
327 | * Let's first consider the case that ip_route_input() succeeds: | |
328 | * | |
329 | * If the output device equals the logical bridge device the packet | |
330 | * came in on, we can consider this bridging. The corresponding MAC | |
331 | * address will be obtained in br_nf_pre_routing_finish_bridge. | |
332 | * Otherwise, the packet is considered to be routed and we just | |
333 | * change the destination MAC address so that the packet will | |
334 | * later be passed up to the IP stack to be routed. For a redirected | |
335 | * packet, ip_route_input() will give back the localhost as output device, | |
336 | * which differs from the bridge device. | |
337 | * | |
338 | * Let's now consider the case that ip_route_input() fails: | |
339 | * | |
340 | * This can be because the destination address is martian, in which case | |
341 | * the packet will be dropped. | |
342 | * If IP forwarding is disabled, ip_route_input() will fail, while | |
343 | * ip_route_output_key() can return success. The source | |
344 | * address for ip_route_output_key() is set to zero, so ip_route_output_key() | |
345 | * thinks we're handling a locally generated packet and won't care | |
346 | * if IP forwarding is enabled. If the output device equals the logical bridge | |
347 | * device, we proceed as if ip_route_input() succeeded. If it differs from the | |
348 | * logical bridge port or if ip_route_output_key() fails we drop the packet. | |
349 | */ | |
350 | static int br_nf_pre_routing_finish(struct net *net, struct sock *sk, struct sk_buff *skb) | |
351 | { | |
352 | struct net_device *dev = skb->dev; | |
353 | struct iphdr *iph = ip_hdr(skb); | |
354 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
355 | struct rtable *rt; | |
356 | int err; | |
357 | ||
358 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; | |
359 | ||
360 | if (nf_bridge->pkt_otherhost) { | |
361 | skb->pkt_type = PACKET_OTHERHOST; | |
362 | nf_bridge->pkt_otherhost = false; | |
363 | } | |
364 | nf_bridge->in_prerouting = 0; | |
365 | if (br_nf_ipv4_daddr_was_changed(skb, nf_bridge)) { | |
366 | if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) { | |
367 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
368 | ||
369 | /* If err equals -EHOSTUNREACH the error is due to a | |
370 | * martian destination or due to the fact that | |
371 | * forwarding is disabled. For most martian packets, | |
372 | * ip_route_output_key() will fail. It won't fail for 2 types of | |
373 | * martian destinations: loopback destinations and destination | |
374 | * 0.0.0.0. In both cases the packet will be dropped because the | |
375 | * destination is the loopback device and not the bridge. */ | |
376 | if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev)) | |
377 | goto free_skb; | |
378 | ||
379 | rt = ip_route_output(net, iph->daddr, 0, | |
380 | RT_TOS(iph->tos), 0); | |
381 | if (!IS_ERR(rt)) { | |
382 | /* - Bridged-and-DNAT'ed traffic doesn't | |
383 | * require ip_forwarding. */ | |
384 | if (rt->dst.dev == dev) { | |
385 | skb_dst_set(skb, &rt->dst); | |
386 | goto bridged_dnat; | |
387 | } | |
388 | ip_rt_put(rt); | |
389 | } | |
390 | free_skb: | |
391 | kfree_skb(skb); | |
392 | return 0; | |
393 | } else { | |
394 | if (skb_dst(skb)->dev == dev) { | |
395 | bridged_dnat: | |
396 | skb->dev = nf_bridge->physindev; | |
397 | nf_bridge_update_protocol(skb); | |
398 | nf_bridge_push_encap_header(skb); | |
399 | br_nf_hook_thresh(NF_BR_PRE_ROUTING, | |
400 | net, sk, skb, skb->dev, | |
401 | NULL, | |
402 | br_nf_pre_routing_finish_bridge); | |
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 | br_nf_hook_thresh(NF_BR_PRE_ROUTING, net, sk, skb, skb->dev, NULL, | |
421 | br_handle_frame_finish); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | static struct net_device *brnf_get_logical_dev(struct sk_buff *skb, const struct net_device *dev) | |
426 | { | |
427 | struct net_device *vlan, *br; | |
428 | ||
429 | br = bridge_parent(dev); | |
430 | if (brnf_pass_vlan_indev == 0 || !skb_vlan_tag_present(skb)) | |
431 | return br; | |
432 | ||
433 | vlan = __vlan_find_dev_deep_rcu(br, skb->vlan_proto, | |
434 | skb_vlan_tag_get(skb) & VLAN_VID_MASK); | |
435 | ||
436 | return vlan ? vlan : br; | |
437 | } | |
438 | ||
439 | /* Some common code for IPv4/IPv6 */ | |
440 | struct net_device *setup_pre_routing(struct sk_buff *skb) | |
441 | { | |
442 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
443 | ||
444 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
445 | skb->pkt_type = PACKET_HOST; | |
446 | nf_bridge->pkt_otherhost = true; | |
447 | } | |
448 | ||
449 | nf_bridge->in_prerouting = 1; | |
450 | nf_bridge->physindev = skb->dev; | |
451 | skb->dev = brnf_get_logical_dev(skb, skb->dev); | |
452 | ||
453 | if (skb->protocol == htons(ETH_P_8021Q)) | |
454 | nf_bridge->orig_proto = BRNF_PROTO_8021Q; | |
455 | else if (skb->protocol == htons(ETH_P_PPP_SES)) | |
456 | nf_bridge->orig_proto = BRNF_PROTO_PPPOE; | |
457 | ||
458 | /* Must drop socket now because of tproxy. */ | |
459 | skb_orphan(skb); | |
460 | return skb->dev; | |
461 | } | |
462 | ||
463 | /* Direct IPv6 traffic to br_nf_pre_routing_ipv6. | |
464 | * Replicate the checks that IPv4 does on packet reception. | |
465 | * Set skb->dev to the bridge device (i.e. parent of the | |
466 | * receiving device) to make netfilter happy, the REDIRECT | |
467 | * target in particular. Save the original destination IP | |
468 | * address to be able to detect DNAT afterwards. */ | |
469 | static unsigned int br_nf_pre_routing(void *priv, | |
470 | struct sk_buff *skb, | |
471 | const struct nf_hook_state *state) | |
472 | { | |
473 | struct nf_bridge_info *nf_bridge; | |
474 | struct net_bridge_port *p; | |
475 | struct net_bridge *br; | |
476 | __u32 len = nf_bridge_encap_header_len(skb); | |
477 | ||
478 | if (unlikely(!pskb_may_pull(skb, len))) | |
479 | return NF_DROP; | |
480 | ||
481 | p = br_port_get_rcu(state->in); | |
482 | if (p == NULL) | |
483 | return NF_DROP; | |
484 | br = p->br; | |
485 | ||
486 | if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { | |
487 | if (!brnf_call_ip6tables && !br->nf_call_ip6tables) | |
488 | return NF_ACCEPT; | |
489 | ||
490 | nf_bridge_pull_encap_header_rcsum(skb); | |
491 | return br_nf_pre_routing_ipv6(priv, skb, state); | |
492 | } | |
493 | ||
494 | if (!brnf_call_iptables && !br->nf_call_iptables) | |
495 | return NF_ACCEPT; | |
496 | ||
497 | if (!IS_IP(skb) && !IS_VLAN_IP(skb) && !IS_PPPOE_IP(skb)) | |
498 | return NF_ACCEPT; | |
499 | ||
500 | nf_bridge_pull_encap_header_rcsum(skb); | |
501 | ||
502 | if (br_validate_ipv4(state->net, skb)) | |
503 | return NF_DROP; | |
504 | ||
505 | nf_bridge_put(skb->nf_bridge); | |
506 | if (!nf_bridge_alloc(skb)) | |
507 | return NF_DROP; | |
508 | if (!setup_pre_routing(skb)) | |
509 | return NF_DROP; | |
510 | ||
511 | nf_bridge = nf_bridge_info_get(skb); | |
512 | nf_bridge->ipv4_daddr = ip_hdr(skb)->daddr; | |
513 | ||
514 | skb->protocol = htons(ETH_P_IP); | |
515 | ||
516 | NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING, state->net, state->sk, skb, | |
517 | skb->dev, NULL, | |
518 | br_nf_pre_routing_finish); | |
519 | ||
520 | return NF_STOLEN; | |
521 | } | |
522 | ||
523 | ||
524 | /* PF_BRIDGE/FORWARD *************************************************/ | |
525 | static int br_nf_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb) | |
526 | { | |
527 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
528 | struct net_device *in; | |
529 | ||
530 | if (!IS_ARP(skb) && !IS_VLAN_ARP(skb)) { | |
531 | ||
532 | if (skb->protocol == htons(ETH_P_IP)) | |
533 | nf_bridge->frag_max_size = IPCB(skb)->frag_max_size; | |
534 | ||
535 | if (skb->protocol == htons(ETH_P_IPV6)) | |
536 | nf_bridge->frag_max_size = IP6CB(skb)->frag_max_size; | |
537 | ||
538 | in = nf_bridge->physindev; | |
539 | if (nf_bridge->pkt_otherhost) { | |
540 | skb->pkt_type = PACKET_OTHERHOST; | |
541 | nf_bridge->pkt_otherhost = false; | |
542 | } | |
543 | nf_bridge_update_protocol(skb); | |
544 | } else { | |
545 | in = *((struct net_device **)(skb->cb)); | |
546 | } | |
547 | nf_bridge_push_encap_header(skb); | |
548 | ||
549 | br_nf_hook_thresh(NF_BR_FORWARD, net, sk, skb, in, skb->dev, | |
550 | br_forward_finish); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | ||
555 | /* This is the 'purely bridged' case. For IP, we pass the packet to | |
556 | * netfilter with indev and outdev set to the bridge device, | |
557 | * but we are still able to filter on the 'real' indev/outdev | |
558 | * because of the physdev module. For ARP, indev and outdev are the | |
559 | * bridge ports. */ | |
560 | static unsigned int br_nf_forward_ip(void *priv, | |
561 | struct sk_buff *skb, | |
562 | const struct nf_hook_state *state) | |
563 | { | |
564 | struct nf_bridge_info *nf_bridge; | |
565 | struct net_device *parent; | |
566 | u_int8_t pf; | |
567 | ||
568 | if (!skb->nf_bridge) | |
569 | return NF_ACCEPT; | |
570 | ||
571 | /* Need exclusive nf_bridge_info since we might have multiple | |
572 | * different physoutdevs. */ | |
573 | if (!nf_bridge_unshare(skb)) | |
574 | return NF_DROP; | |
575 | ||
576 | nf_bridge = nf_bridge_info_get(skb); | |
577 | if (!nf_bridge) | |
578 | return NF_DROP; | |
579 | ||
580 | parent = bridge_parent(state->out); | |
581 | if (!parent) | |
582 | return NF_DROP; | |
583 | ||
584 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) | |
585 | pf = NFPROTO_IPV4; | |
586 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) | |
587 | pf = NFPROTO_IPV6; | |
588 | else | |
589 | return NF_ACCEPT; | |
590 | ||
591 | nf_bridge_pull_encap_header(skb); | |
592 | ||
593 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
594 | skb->pkt_type = PACKET_HOST; | |
595 | nf_bridge->pkt_otherhost = true; | |
596 | } | |
597 | ||
598 | if (pf == NFPROTO_IPV4) { | |
599 | if (br_validate_ipv4(state->net, skb)) | |
600 | return NF_DROP; | |
601 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
602 | } | |
603 | ||
604 | if (pf == NFPROTO_IPV6) { | |
605 | if (br_validate_ipv6(state->net, skb)) | |
606 | return NF_DROP; | |
607 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
608 | } | |
609 | ||
610 | nf_bridge->physoutdev = skb->dev; | |
611 | if (pf == NFPROTO_IPV4) | |
612 | skb->protocol = htons(ETH_P_IP); | |
613 | else | |
614 | skb->protocol = htons(ETH_P_IPV6); | |
615 | ||
616 | NF_HOOK(pf, NF_INET_FORWARD, state->net, NULL, skb, | |
617 | brnf_get_logical_dev(skb, state->in), | |
618 | parent, br_nf_forward_finish); | |
619 | ||
620 | return NF_STOLEN; | |
621 | } | |
622 | ||
623 | static unsigned int br_nf_forward_arp(void *priv, | |
624 | struct sk_buff *skb, | |
625 | const struct nf_hook_state *state) | |
626 | { | |
627 | struct net_bridge_port *p; | |
628 | struct net_bridge *br; | |
629 | struct net_device **d = (struct net_device **)(skb->cb); | |
630 | ||
631 | p = br_port_get_rcu(state->out); | |
632 | if (p == NULL) | |
633 | return NF_ACCEPT; | |
634 | br = p->br; | |
635 | ||
636 | if (!brnf_call_arptables && !br->nf_call_arptables) | |
637 | return NF_ACCEPT; | |
638 | ||
639 | if (!IS_ARP(skb)) { | |
640 | if (!IS_VLAN_ARP(skb)) | |
641 | return NF_ACCEPT; | |
642 | nf_bridge_pull_encap_header(skb); | |
643 | } | |
644 | ||
645 | if (arp_hdr(skb)->ar_pln != 4) { | |
646 | if (IS_VLAN_ARP(skb)) | |
647 | nf_bridge_push_encap_header(skb); | |
648 | return NF_ACCEPT; | |
649 | } | |
650 | *d = state->in; | |
651 | NF_HOOK(NFPROTO_ARP, NF_ARP_FORWARD, state->net, state->sk, skb, | |
652 | state->in, state->out, br_nf_forward_finish); | |
653 | ||
654 | return NF_STOLEN; | |
655 | } | |
656 | ||
657 | static int br_nf_push_frag_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) | |
658 | { | |
659 | struct brnf_frag_data *data; | |
660 | int err; | |
661 | ||
662 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
663 | err = skb_cow_head(skb, data->size); | |
664 | ||
665 | if (err) { | |
666 | kfree_skb(skb); | |
667 | return 0; | |
668 | } | |
669 | ||
670 | if (data->vlan_tci) { | |
671 | skb->vlan_tci = data->vlan_tci; | |
672 | skb->vlan_proto = data->vlan_proto; | |
673 | } | |
674 | ||
675 | skb_copy_to_linear_data_offset(skb, -data->size, data->mac, data->size); | |
676 | __skb_push(skb, data->encap_size); | |
677 | ||
678 | nf_bridge_info_free(skb); | |
679 | return br_dev_queue_push_xmit(net, sk, skb); | |
680 | } | |
681 | ||
682 | static int | |
683 | br_nf_ip_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, | |
684 | int (*output)(struct net *, struct sock *, struct sk_buff *)) | |
685 | { | |
686 | unsigned int mtu = ip_skb_dst_mtu(sk, skb); | |
687 | struct iphdr *iph = ip_hdr(skb); | |
688 | ||
689 | if (unlikely(((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) || | |
690 | (IPCB(skb)->frag_max_size && | |
691 | IPCB(skb)->frag_max_size > mtu))) { | |
692 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); | |
693 | kfree_skb(skb); | |
694 | return -EMSGSIZE; | |
695 | } | |
696 | ||
697 | return ip_do_fragment(net, sk, skb, output); | |
698 | } | |
699 | ||
700 | static unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb) | |
701 | { | |
702 | if (skb->nf_bridge->orig_proto == BRNF_PROTO_PPPOE) | |
703 | return PPPOE_SES_HLEN; | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static int br_nf_dev_queue_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) | |
708 | { | |
709 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
710 | unsigned int mtu, mtu_reserved; | |
711 | ||
712 | mtu_reserved = nf_bridge_mtu_reduction(skb); | |
713 | mtu = skb->dev->mtu; | |
714 | ||
715 | if (nf_bridge->frag_max_size && nf_bridge->frag_max_size < mtu) | |
716 | mtu = nf_bridge->frag_max_size; | |
717 | ||
718 | if (skb_is_gso(skb) || skb->len + mtu_reserved <= mtu) { | |
719 | nf_bridge_info_free(skb); | |
720 | return br_dev_queue_push_xmit(net, sk, skb); | |
721 | } | |
722 | ||
723 | /* This is wrong! We should preserve the original fragment | |
724 | * boundaries by preserving frag_list rather than refragmenting. | |
725 | */ | |
726 | if (IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) && | |
727 | skb->protocol == htons(ETH_P_IP)) { | |
728 | struct brnf_frag_data *data; | |
729 | ||
730 | if (br_validate_ipv4(net, skb)) | |
731 | goto drop; | |
732 | ||
733 | IPCB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
734 | ||
735 | nf_bridge_update_protocol(skb); | |
736 | ||
737 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
738 | ||
739 | data->vlan_tci = skb->vlan_tci; | |
740 | data->vlan_proto = skb->vlan_proto; | |
741 | data->encap_size = nf_bridge_encap_header_len(skb); | |
742 | data->size = ETH_HLEN + data->encap_size; | |
743 | ||
744 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, | |
745 | data->size); | |
746 | ||
747 | return br_nf_ip_fragment(net, sk, skb, br_nf_push_frag_xmit); | |
748 | } | |
749 | if (IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) && | |
750 | skb->protocol == htons(ETH_P_IPV6)) { | |
751 | const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); | |
752 | struct brnf_frag_data *data; | |
753 | ||
754 | if (br_validate_ipv6(net, skb)) | |
755 | goto drop; | |
756 | ||
757 | IP6CB(skb)->frag_max_size = nf_bridge->frag_max_size; | |
758 | ||
759 | nf_bridge_update_protocol(skb); | |
760 | ||
761 | data = this_cpu_ptr(&brnf_frag_data_storage); | |
762 | data->encap_size = nf_bridge_encap_header_len(skb); | |
763 | data->size = ETH_HLEN + data->encap_size; | |
764 | ||
765 | skb_copy_from_linear_data_offset(skb, -data->size, data->mac, | |
766 | data->size); | |
767 | ||
768 | if (v6ops) | |
769 | return v6ops->fragment(net, sk, skb, br_nf_push_frag_xmit); | |
770 | ||
771 | kfree_skb(skb); | |
772 | return -EMSGSIZE; | |
773 | } | |
774 | nf_bridge_info_free(skb); | |
775 | return br_dev_queue_push_xmit(net, sk, skb); | |
776 | drop: | |
777 | kfree_skb(skb); | |
778 | return 0; | |
779 | } | |
780 | ||
781 | /* PF_BRIDGE/POST_ROUTING ********************************************/ | |
782 | static unsigned int br_nf_post_routing(void *priv, | |
783 | struct sk_buff *skb, | |
784 | const struct nf_hook_state *state) | |
785 | { | |
786 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
787 | struct net_device *realoutdev = bridge_parent(skb->dev); | |
788 | u_int8_t pf; | |
789 | ||
790 | /* if nf_bridge is set, but ->physoutdev is NULL, this packet came in | |
791 | * on a bridge, but was delivered locally and is now being routed: | |
792 | * | |
793 | * POST_ROUTING was already invoked from the ip stack. | |
794 | */ | |
795 | if (!nf_bridge || !nf_bridge->physoutdev) | |
796 | return NF_ACCEPT; | |
797 | ||
798 | if (!realoutdev) | |
799 | return NF_DROP; | |
800 | ||
801 | if (IS_IP(skb) || IS_VLAN_IP(skb) || IS_PPPOE_IP(skb)) | |
802 | pf = NFPROTO_IPV4; | |
803 | else if (IS_IPV6(skb) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) | |
804 | pf = NFPROTO_IPV6; | |
805 | else | |
806 | return NF_ACCEPT; | |
807 | ||
808 | /* We assume any code from br_dev_queue_push_xmit onwards doesn't care | |
809 | * about the value of skb->pkt_type. */ | |
810 | if (skb->pkt_type == PACKET_OTHERHOST) { | |
811 | skb->pkt_type = PACKET_HOST; | |
812 | nf_bridge->pkt_otherhost = true; | |
813 | } | |
814 | ||
815 | nf_bridge_pull_encap_header(skb); | |
816 | if (pf == NFPROTO_IPV4) | |
817 | skb->protocol = htons(ETH_P_IP); | |
818 | else | |
819 | skb->protocol = htons(ETH_P_IPV6); | |
820 | ||
821 | NF_HOOK(pf, NF_INET_POST_ROUTING, state->net, state->sk, skb, | |
822 | NULL, realoutdev, | |
823 | br_nf_dev_queue_xmit); | |
824 | ||
825 | return NF_STOLEN; | |
826 | } | |
827 | ||
828 | /* IP/SABOTAGE *****************************************************/ | |
829 | /* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING | |
830 | * for the second time. */ | |
831 | static unsigned int ip_sabotage_in(void *priv, | |
832 | struct sk_buff *skb, | |
833 | const struct nf_hook_state *state) | |
834 | { | |
835 | if (skb->nf_bridge && !skb->nf_bridge->in_prerouting) { | |
836 | state->okfn(state->net, state->sk, skb); | |
837 | return NF_STOLEN; | |
838 | } | |
839 | ||
840 | return NF_ACCEPT; | |
841 | } | |
842 | ||
843 | /* This is called when br_netfilter has called into iptables/netfilter, | |
844 | * and DNAT has taken place on a bridge-forwarded packet. | |
845 | * | |
846 | * neigh->output has created a new MAC header, with local br0 MAC | |
847 | * as saddr. | |
848 | * | |
849 | * This restores the original MAC saddr of the bridged packet | |
850 | * before invoking bridge forward logic to transmit the packet. | |
851 | */ | |
852 | static void br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb) | |
853 | { | |
854 | struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb); | |
855 | ||
856 | skb_pull(skb, ETH_HLEN); | |
857 | nf_bridge->bridged_dnat = 0; | |
858 | ||
859 | BUILD_BUG_ON(sizeof(nf_bridge->neigh_header) != (ETH_HLEN - ETH_ALEN)); | |
860 | ||
861 | skb_copy_to_linear_data_offset(skb, -(ETH_HLEN - ETH_ALEN), | |
862 | nf_bridge->neigh_header, | |
863 | ETH_HLEN - ETH_ALEN); | |
864 | skb->dev = nf_bridge->physindev; | |
865 | ||
866 | nf_bridge->physoutdev = NULL; | |
867 | br_handle_frame_finish(dev_net(skb->dev), NULL, skb); | |
868 | } | |
869 | ||
870 | static int br_nf_dev_xmit(struct sk_buff *skb) | |
871 | { | |
872 | if (skb->nf_bridge && skb->nf_bridge->bridged_dnat) { | |
873 | br_nf_pre_routing_finish_bridge_slow(skb); | |
874 | return 1; | |
875 | } | |
876 | return 0; | |
877 | } | |
878 | ||
879 | static const struct nf_br_ops br_ops = { | |
880 | .br_dev_xmit_hook = br_nf_dev_xmit, | |
881 | }; | |
882 | ||
883 | void br_netfilter_enable(void) | |
884 | { | |
885 | } | |
886 | EXPORT_SYMBOL_GPL(br_netfilter_enable); | |
887 | ||
888 | /* For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because | |
889 | * br_dev_queue_push_xmit is called afterwards */ | |
890 | static const struct nf_hook_ops br_nf_ops[] = { | |
891 | { | |
892 | .hook = br_nf_pre_routing, | |
893 | .pf = NFPROTO_BRIDGE, | |
894 | .hooknum = NF_BR_PRE_ROUTING, | |
895 | .priority = NF_BR_PRI_BRNF, | |
896 | }, | |
897 | { | |
898 | .hook = br_nf_forward_ip, | |
899 | .pf = NFPROTO_BRIDGE, | |
900 | .hooknum = NF_BR_FORWARD, | |
901 | .priority = NF_BR_PRI_BRNF - 1, | |
902 | }, | |
903 | { | |
904 | .hook = br_nf_forward_arp, | |
905 | .pf = NFPROTO_BRIDGE, | |
906 | .hooknum = NF_BR_FORWARD, | |
907 | .priority = NF_BR_PRI_BRNF, | |
908 | }, | |
909 | { | |
910 | .hook = br_nf_post_routing, | |
911 | .pf = NFPROTO_BRIDGE, | |
912 | .hooknum = NF_BR_POST_ROUTING, | |
913 | .priority = NF_BR_PRI_LAST, | |
914 | }, | |
915 | { | |
916 | .hook = ip_sabotage_in, | |
917 | .pf = NFPROTO_IPV4, | |
918 | .hooknum = NF_INET_PRE_ROUTING, | |
919 | .priority = NF_IP_PRI_FIRST, | |
920 | }, | |
921 | { | |
922 | .hook = ip_sabotage_in, | |
923 | .pf = NFPROTO_IPV6, | |
924 | .hooknum = NF_INET_PRE_ROUTING, | |
925 | .priority = NF_IP6_PRI_FIRST, | |
926 | }, | |
927 | }; | |
928 | ||
929 | static int brnf_device_event(struct notifier_block *unused, unsigned long event, | |
930 | void *ptr) | |
931 | { | |
932 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
933 | struct brnf_net *brnet; | |
934 | struct net *net; | |
935 | int ret; | |
936 | ||
937 | if (event != NETDEV_REGISTER || !(dev->priv_flags & IFF_EBRIDGE)) | |
938 | return NOTIFY_DONE; | |
939 | ||
940 | ASSERT_RTNL(); | |
941 | ||
942 | net = dev_net(dev); | |
943 | brnet = net_generic(net, brnf_net_id); | |
944 | if (brnet->enabled) | |
945 | return NOTIFY_OK; | |
946 | ||
947 | ret = nf_register_net_hooks(net, br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
948 | if (ret) | |
949 | return NOTIFY_BAD; | |
950 | ||
951 | brnet->enabled = true; | |
952 | return NOTIFY_OK; | |
953 | } | |
954 | ||
955 | static void __net_exit brnf_exit_net(struct net *net) | |
956 | { | |
957 | struct brnf_net *brnet = net_generic(net, brnf_net_id); | |
958 | ||
959 | if (!brnet->enabled) | |
960 | return; | |
961 | ||
962 | nf_unregister_net_hooks(net, br_nf_ops, ARRAY_SIZE(br_nf_ops)); | |
963 | brnet->enabled = false; | |
964 | } | |
965 | ||
966 | static struct pernet_operations brnf_net_ops __read_mostly = { | |
967 | .exit = brnf_exit_net, | |
968 | .id = &brnf_net_id, | |
969 | .size = sizeof(struct brnf_net), | |
970 | }; | |
971 | ||
972 | static struct notifier_block brnf_notifier __read_mostly = { | |
973 | .notifier_call = brnf_device_event, | |
974 | }; | |
975 | ||
976 | /* recursively invokes nf_hook_slow (again), skipping already-called | |
977 | * hooks (< NF_BR_PRI_BRNF). | |
978 | * | |
979 | * Called with rcu read lock held. | |
980 | */ | |
981 | int br_nf_hook_thresh(unsigned int hook, struct net *net, | |
982 | struct sock *sk, struct sk_buff *skb, | |
983 | struct net_device *indev, | |
984 | struct net_device *outdev, | |
985 | int (*okfn)(struct net *, struct sock *, | |
986 | struct sk_buff *)) | |
987 | { | |
988 | const struct nf_hook_entries *e; | |
989 | struct nf_hook_state state; | |
990 | struct nf_hook_ops **ops; | |
991 | unsigned int i; | |
992 | int ret; | |
993 | ||
994 | e = rcu_dereference(net->nf.hooks[NFPROTO_BRIDGE][hook]); | |
995 | if (!e) | |
996 | return okfn(net, sk, skb); | |
997 | ||
998 | ops = nf_hook_entries_get_hook_ops(e); | |
999 | for (i = 0; i < e->num_hook_entries && | |
1000 | ops[i]->priority <= NF_BR_PRI_BRNF; i++) | |
1001 | ; | |
1002 | ||
1003 | nf_hook_state_init(&state, hook, NFPROTO_BRIDGE, indev, outdev, | |
1004 | sk, net, okfn); | |
1005 | ||
1006 | ret = nf_hook_slow(skb, &state, e, i); | |
1007 | if (ret == 1) | |
1008 | ret = okfn(net, sk, skb); | |
1009 | ||
1010 | return ret; | |
1011 | } | |
1012 | ||
1013 | #ifdef CONFIG_SYSCTL | |
1014 | static | |
1015 | int brnf_sysctl_call_tables(struct ctl_table *ctl, int write, | |
1016 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
1017 | { | |
1018 | int ret; | |
1019 | ||
1020 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); | |
1021 | ||
1022 | if (write && *(int *)(ctl->data)) | |
1023 | *(int *)(ctl->data) = 1; | |
1024 | return ret; | |
1025 | } | |
1026 | ||
1027 | static struct ctl_table brnf_table[] = { | |
1028 | { | |
1029 | .procname = "bridge-nf-call-arptables", | |
1030 | .data = &brnf_call_arptables, | |
1031 | .maxlen = sizeof(int), | |
1032 | .mode = 0644, | |
1033 | .proc_handler = brnf_sysctl_call_tables, | |
1034 | }, | |
1035 | { | |
1036 | .procname = "bridge-nf-call-iptables", | |
1037 | .data = &brnf_call_iptables, | |
1038 | .maxlen = sizeof(int), | |
1039 | .mode = 0644, | |
1040 | .proc_handler = brnf_sysctl_call_tables, | |
1041 | }, | |
1042 | { | |
1043 | .procname = "bridge-nf-call-ip6tables", | |
1044 | .data = &brnf_call_ip6tables, | |
1045 | .maxlen = sizeof(int), | |
1046 | .mode = 0644, | |
1047 | .proc_handler = brnf_sysctl_call_tables, | |
1048 | }, | |
1049 | { | |
1050 | .procname = "bridge-nf-filter-vlan-tagged", | |
1051 | .data = &brnf_filter_vlan_tagged, | |
1052 | .maxlen = sizeof(int), | |
1053 | .mode = 0644, | |
1054 | .proc_handler = brnf_sysctl_call_tables, | |
1055 | }, | |
1056 | { | |
1057 | .procname = "bridge-nf-filter-pppoe-tagged", | |
1058 | .data = &brnf_filter_pppoe_tagged, | |
1059 | .maxlen = sizeof(int), | |
1060 | .mode = 0644, | |
1061 | .proc_handler = brnf_sysctl_call_tables, | |
1062 | }, | |
1063 | { | |
1064 | .procname = "bridge-nf-pass-vlan-input-dev", | |
1065 | .data = &brnf_pass_vlan_indev, | |
1066 | .maxlen = sizeof(int), | |
1067 | .mode = 0644, | |
1068 | .proc_handler = brnf_sysctl_call_tables, | |
1069 | }, | |
1070 | { } | |
1071 | }; | |
1072 | #endif | |
1073 | ||
1074 | static int __init br_netfilter_init(void) | |
1075 | { | |
1076 | int ret; | |
1077 | ||
1078 | ret = register_pernet_subsys(&brnf_net_ops); | |
1079 | if (ret < 0) | |
1080 | return ret; | |
1081 | ||
1082 | ret = register_netdevice_notifier(&brnf_notifier); | |
1083 | if (ret < 0) { | |
1084 | unregister_pernet_subsys(&brnf_net_ops); | |
1085 | return ret; | |
1086 | } | |
1087 | ||
1088 | #ifdef CONFIG_SYSCTL | |
1089 | brnf_sysctl_header = register_net_sysctl(&init_net, "net/bridge", brnf_table); | |
1090 | if (brnf_sysctl_header == NULL) { | |
1091 | printk(KERN_WARNING | |
1092 | "br_netfilter: can't register to sysctl.\n"); | |
1093 | unregister_netdevice_notifier(&brnf_notifier); | |
1094 | unregister_pernet_subsys(&brnf_net_ops); | |
1095 | return -ENOMEM; | |
1096 | } | |
1097 | #endif | |
1098 | RCU_INIT_POINTER(nf_br_ops, &br_ops); | |
1099 | printk(KERN_NOTICE "Bridge firewalling registered\n"); | |
1100 | return 0; | |
1101 | } | |
1102 | ||
1103 | static void __exit br_netfilter_fini(void) | |
1104 | { | |
1105 | RCU_INIT_POINTER(nf_br_ops, NULL); | |
1106 | unregister_netdevice_notifier(&brnf_notifier); | |
1107 | unregister_pernet_subsys(&brnf_net_ops); | |
1108 | #ifdef CONFIG_SYSCTL | |
1109 | unregister_net_sysctl_table(brnf_sysctl_header); | |
1110 | #endif | |
1111 | } | |
1112 | ||
1113 | module_init(br_netfilter_init); | |
1114 | module_exit(br_netfilter_fini); | |
1115 | ||
1116 | MODULE_LICENSE("GPL"); | |
1117 | MODULE_AUTHOR("Lennert Buytenhek <buytenh@gnu.org>"); | |
1118 | MODULE_AUTHOR("Bart De Schuymer <bdschuym@pandora.be>"); | |
1119 | MODULE_DESCRIPTION("Linux ethernet netfilter firewall bridge"); |