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[IPV6]: Make fib6_node subtree depend on IPV6_SUBTREES
[linux-block.git] / net / bridge / br_netfilter.c
CommitLineData
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>
f216f082 37#include <linux/inetdevice.h>
14c85021 38
1da177e4
LT		 39#include <net/ip.h>
40#include <net/ipv6.h>
14c85021
ACM		 41#include <net/route.h>
42
1da177e4 43#include <asm/uaccess.h>
1da177e4
LT		 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
55static struct ctl_table_header *brnf_sysctl_header;
9c1ea148
BH		 56static int brnf_call_iptables __read_mostly = 1;
57static int brnf_call_ip6tables __read_mostly = 1;
58static int brnf_call_arptables __read_mostly = 1;
59static int brnf_filter_vlan_tagged __read_mostly = 1;
1da177e4
LT		 60#else
61#define brnf_filter_vlan_tagged 1
62#endif
63
10ea6ac8
PM		 64int brnf_deferred_hooks;
65EXPORT_SYMBOL_GPL(brnf_deferred_hooks);
66
8b42ec39
SH		 67static __be16 inline vlan_proto(const struct sk_buff *skb)
68{
69 return vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
70}
71
72#define IS_VLAN_IP(skb) \
73 (skb->protocol == htons(ETH_P_8021Q) && \
74 vlan_proto(skb) == htons(ETH_P_IP) && \
75 brnf_filter_vlan_tagged)
76
77#define IS_VLAN_IPV6(skb) \
78 (skb->protocol == htons(ETH_P_8021Q) && \
79 vlan_proto(skb) == htons(ETH_P_IPV6) &&\
80 brnf_filter_vlan_tagged)
81
82#define IS_VLAN_ARP(skb) \
83 (skb->protocol == htons(ETH_P_8021Q) && \
84 vlan_proto(skb) == htons(ETH_P_ARP) && \
85 brnf_filter_vlan_tagged)
1da177e4
LT		 86
87/* We need these fake structures to make netfilter happy --
88 * lots of places assume that skb->dst != NULL, which isn't
89 * all that unreasonable.
90 *
91 * Currently, we fill in the PMTU entry because netfilter
92 * refragmentation needs it, and the rt_flags entry because
93 * ipt_REJECT needs it. Future netfilter modules might
94 * require us to fill additional fields. */
95static struct net_device __fake_net_device = {
96 .hard_header_len = ETH_HLEN
97};
98
99static struct rtable __fake_rtable = {
100 .u = {
101 .dst = {
102 .__refcnt = ATOMIC_INIT(1),
103 .dev = &__fake_net_device,
104 .path = &__fake_rtable.u.dst,
105 .metrics = {[RTAX_MTU - 1] = 1500},
42cf93cd 106 .flags = DST_NOXFRM,
1da177e4
LT		 107 }
108 },
109 .rt_flags = 0,
110};
111
5dce971a
SH		 112static inline struct net_device *bridge_parent(const struct net_device *dev)
113{
114 struct net_bridge_port *port = rcu_dereference(dev->br_port);
115
116 return port ? port->br->dev : NULL;
117}
1da177e4 118
fdeabdef
SH		 119static inline struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
120{
121 skb->nf_bridge = kzalloc(sizeof(struct nf_bridge_info), GFP_ATOMIC);
122 if (likely(skb->nf_bridge))
123 atomic_set(&(skb->nf_bridge->use), 1);
124
125 return skb->nf_bridge;
126}
127
128static inline void nf_bridge_save_header(struct sk_buff *skb)
129{
07317621 130 int header_size = ETH_HLEN;
fdeabdef
SH		 131
132 if (skb->protocol == htons(ETH_P_8021Q))
07317621 133 header_size += VLAN_HLEN;
fdeabdef
SH		 134
135 memcpy(skb->nf_bridge->data, skb->data - header_size, header_size);
136}
137
07317621
SH		 138/*
139 * When forwarding bridge frames, we save a copy of the original
140 * header before processing.
141 */
142int nf_bridge_copy_header(struct sk_buff *skb)
143{
144 int err;
145 int header_size = ETH_HLEN;
146
147 if (skb->protocol == htons(ETH_P_8021Q))
148 header_size += VLAN_HLEN;
149
150 err = skb_cow(skb, header_size);
151 if (err)
152 return err;
153
154 memcpy(skb->data - header_size, skb->nf_bridge->data, header_size);
155
156 if (skb->protocol == htons(ETH_P_8021Q))
157 __skb_push(skb, VLAN_HLEN);
158 return 0;
159}
160
1da177e4
LT		 161/* PF_BRIDGE/PRE_ROUTING *********************************************/
162/* Undo the changes made for ip6tables PREROUTING and continue the
163 * bridge PRE_ROUTING hook. */
164static int br_nf_pre_routing_finish_ipv6(struct sk_buff *skb)
165{
166 struct nf_bridge_info *nf_bridge = skb->nf_bridge;
167
1da177e4
LT		 168 if (nf_bridge->mask & BRNF_PKT_TYPE) {
169 skb->pkt_type = PACKET_OTHERHOST;
170 nf_bridge->mask ^= BRNF_PKT_TYPE;
171 }
172 nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
173
174 skb->dst = (struct dst_entry *)&__fake_rtable;
175 dst_hold(skb->dst);
176
177 skb->dev = nf_bridge->physindev;
f8a26028 178 if (skb->protocol == htons(ETH_P_8021Q)) {
1da177e4
LT		 179 skb_push(skb, VLAN_HLEN);
180 skb->nh.raw -= VLAN_HLEN;
181 }
182 NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
183 br_handle_frame_finish, 1);
184
185 return 0;
186}
187
188static void __br_dnat_complain(void)
189{
190 static unsigned long last_complaint;
191
192 if (jiffies - last_complaint >= 5 * HZ) {
193 printk(KERN_WARNING "Performing cross-bridge DNAT requires IP "
789bc3e5 194 "forwarding to be enabled\n");
1da177e4
LT		 195 last_complaint = jiffies;
196 }
197}
198
199/* This requires some explaining. If DNAT has taken place,
200 * we will need to fix up the destination Ethernet address,
201 * and this is a tricky process.
202 *
203 * There are two cases to consider:
204 * 1. The packet was DNAT'ed to a device in the same bridge
205 * port group as it was received on. We can still bridge
206 * the packet.
207 * 2. The packet was DNAT'ed to a different device, either
208 * a non-bridged device or another bridge port group.
209 * The packet will need to be routed.
210 *
211 * The correct way of distinguishing between these two cases is to
212 * call ip_route_input() and to look at skb->dst->dev, which is
213 * changed to the destination device if ip_route_input() succeeds.
214 *
215 * Let us first consider the case that ip_route_input() succeeds:
216 *
217 * If skb->dst->dev equals the logical bridge device the packet
218 * came in on, we can consider this bridging. We then call
219 * skb->dst->output() which will make the packet enter br_nf_local_out()
220 * not much later. In that function it is assured that the iptables
221 * FORWARD chain is traversed for the packet.
222 *
223 * Otherwise, the packet is considered to be routed and we just
224 * change the destination MAC address so that the packet will
f216f082
BDS		 225 * later be passed up to the IP stack to be routed. For a redirected
226 * packet, ip_route_input() will give back the localhost as output device,
227 * which differs from the bridge device.
1da177e4
LT		 228 *
229 * Let us now consider the case that ip_route_input() fails:
230 *
f216f082
BDS		 231 * This can be because the destination address is martian, in which case
232 * the packet will be dropped.
1da177e4
LT		 233 * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input()
234 * will fail, while __ip_route_output_key() will return success. The source
235 * address for __ip_route_output_key() is set to zero, so __ip_route_output_key
236 * thinks we're handling a locally generated packet and won't care
237 * if IP forwarding is allowed. We send a warning message to the users's
238 * log telling her to put IP forwarding on.
239 *
240 * ip_route_input() will also fail if there is no route available.
241 * In that case we just drop the packet.
242 *
243 * --Lennert, 20020411
244 * --Bart, 20020416 (updated)
f216f082
BDS		 245 * --Bart, 20021007 (updated)
246 * --Bart, 20062711 (updated) */
1da177e4
LT		 247static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
248{
1da177e4
LT		 249 if (skb->pkt_type == PACKET_OTHERHOST) {
250 skb->pkt_type = PACKET_HOST;
251 skb->nf_bridge->mask |= BRNF_PKT_TYPE;
252 }
253 skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
254
255 skb->dev = bridge_parent(skb->dev);
5dce971a
SH		 256 if (!skb->dev)
257 kfree_skb(skb);
258 else {
f8a26028 259 if (skb->protocol == htons(ETH_P_8021Q)) {
5dce971a
SH		 260 skb_pull(skb, VLAN_HLEN);
261 skb->nh.raw += VLAN_HLEN;
262 }
263 skb->dst->output(skb);
1da177e4 264 }
1da177e4
LT		 265 return 0;
266}
267
268static int br_nf_pre_routing_finish(struct sk_buff *skb)
269{
270 struct net_device *dev = skb->dev;
271 struct iphdr *iph = skb->nh.iph;
272 struct nf_bridge_info *nf_bridge = skb->nf_bridge;
f216f082 273 int err;
1da177e4 274
1da177e4
LT		 275 if (nf_bridge->mask & BRNF_PKT_TYPE) {
276 skb->pkt_type = PACKET_OTHERHOST;
277 nf_bridge->mask ^= BRNF_PKT_TYPE;
278 }
279 nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
1da177e4 280 if (dnat_took_place(skb)) {
f216f082 281 if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) {
1da177e4 282 struct rtable *rt;
789bc3e5
SH		 283 struct flowi fl = {
284 .nl_u = {
285 .ip4_u = {
286 .daddr = iph->daddr,
287 .saddr = 0,
288 .tos = RT_TOS(iph->tos) },
289 },
290 .proto = 0,
291 };
f216f082
BDS		 292 struct in_device *in_dev = in_dev_get(dev);
293
294 /* If err equals -EHOSTUNREACH the error is due to a
295 * martian destination or due to the fact that
296 * forwarding is disabled. For most martian packets,
297 * ip_route_output_key() will fail. It won't fail for 2 types of
298 * martian destinations: loopback destinations and destination
299 * 0.0.0.0. In both cases the packet will be dropped because the
300 * destination is the loopback device and not the bridge. */
301 if (err != -EHOSTUNREACH || !in_dev || IN_DEV_FORWARD(in_dev))
302 goto free_skb;
1da177e4
LT		 303
304 if (!ip_route_output_key(&rt, &fl)) {
1c011bed 305 /* - Bridged-and-DNAT'ed traffic doesn't
f216f082
BDS		 306 * require ip_forwarding. */
307 if (((struct dst_entry *)rt)->dev == dev) {
1da177e4
LT		 308 skb->dst = (struct dst_entry *)rt;
309 goto bridged_dnat;
310 }
f216f082
BDS		 311 /* we are sure that forwarding is disabled, so printing
312 * this message is no problem. Note that the packet could
313 * still have a martian destination address, in which case
314 * the packet could be dropped even if forwarding were enabled */
1da177e4
LT		 315 __br_dnat_complain();
316 dst_release((struct dst_entry *)rt);
317 }
f216f082 318free_skb:
1da177e4
LT		 319 kfree_skb(skb);
320 return 0;
321 } else {
322 if (skb->dst->dev == dev) {
323bridged_dnat:
324 /* Tell br_nf_local_out this is a
325 * bridged frame */
326 nf_bridge->mask |= BRNF_BRIDGED_DNAT;
327 skb->dev = nf_bridge->physindev;
328 if (skb->protocol ==
f8a26028 329 htons(ETH_P_8021Q)) {
1da177e4
LT		 330 skb_push(skb, VLAN_HLEN);
331 skb->nh.raw -= VLAN_HLEN;
332 }
333 NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING,
334 skb, skb->dev, NULL,
335 br_nf_pre_routing_finish_bridge,
336 1);
337 return 0;
338 }
789bc3e5 339 memcpy(eth_hdr(skb)->h_dest, dev->dev_addr, ETH_ALEN);
1da177e4
LT		 340 skb->pkt_type = PACKET_HOST;
341 }
342 } else {
343 skb->dst = (struct dst_entry *)&__fake_rtable;
344 dst_hold(skb->dst);
345 }
346
347 skb->dev = nf_bridge->physindev;
f8a26028 348 if (skb->protocol == htons(ETH_P_8021Q)) {
1da177e4
LT		 349 skb_push(skb, VLAN_HLEN);
350 skb->nh.raw -= VLAN_HLEN;
351 }
352 NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
353 br_handle_frame_finish, 1);
354
355 return 0;
356}
357
358/* Some common code for IPv4/IPv6 */
5dce971a 359static struct net_device *setup_pre_routing(struct sk_buff *skb)
1da177e4
LT		 360{
361 struct nf_bridge_info *nf_bridge = skb->nf_bridge;
362
363 if (skb->pkt_type == PACKET_OTHERHOST) {
364 skb->pkt_type = PACKET_HOST;
365 nf_bridge->mask |= BRNF_PKT_TYPE;
366 }
367
368 nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING;
369 nf_bridge->physindev = skb->dev;
370 skb->dev = bridge_parent(skb->dev);
5dce971a
SH		 371
372 return skb->dev;
1da177e4
LT		 373}
374
375/* We only check the length. A bridge shouldn't do any hop-by-hop stuff anyway */
376static int check_hbh_len(struct sk_buff *skb)
377{
789bc3e5 378 unsigned char *raw = (u8 *) (skb->nh.ipv6h + 1);
1da177e4
LT		 379 u32 pkt_len;
380 int off = raw - skb->nh.raw;
789bc3e5 381 int len = (raw[1] + 1) << 3;
1da177e4
LT		 382
383 if ((raw + len) - skb->data > skb_headlen(skb))
384 goto bad;
385
386 off += 2;
387 len -= 2;
388
389 while (len > 0) {
789bc3e5 390 int optlen = skb->nh.raw[off + 1] + 2;
1da177e4
LT		 391
392 switch (skb->nh.raw[off]) {
393 case IPV6_TLV_PAD0:
394 optlen = 1;
395 break;
396
397 case IPV6_TLV_PADN:
398 break;
399
400 case IPV6_TLV_JUMBO:
789bc3e5 401 if (skb->nh.raw[off + 1] != 4 || (off & 3) != 2)
1da177e4 402 goto bad;
47c183fa 403 pkt_len = ntohl(*(__be32 *) (skb->nh.raw + off + 2));
b0366486
BDS		 404 if (pkt_len <= IPV6_MAXPLEN ||
405 skb->nh.ipv6h->payload_len)
406 goto bad;
1da177e4
LT		 407 if (pkt_len > skb->len - sizeof(struct ipv6hdr))
408 goto bad;
b0366486 409 if (pskb_trim_rcsum(skb,
789bc3e5 410 pkt_len + sizeof(struct ipv6hdr)))
b0366486 411 goto bad;
1da177e4
LT		 412 break;
413 default:
414 if (optlen > len)
415 goto bad;
416 break;
417 }
418 off += optlen;
419 len -= optlen;
420 }
421 if (len == 0)
422 return 0;
423bad:
424 return -1;
425
426}
427
428/* Replicate the checks that IPv6 does on packet reception and pass the packet
429 * to ip6tables, which doesn't support NAT, so things are fairly simple. */
430static unsigned int br_nf_pre_routing_ipv6(unsigned int hook,
789bc3e5
SH		 431 struct sk_buff *skb,
432 const struct net_device *in,
433 const struct net_device *out,
434 int (*okfn)(struct sk_buff *))
1da177e4
LT		 435{
436 struct ipv6hdr *hdr;
437 u32 pkt_len;
1da177e4
LT		 438
439 if (skb->len < sizeof(struct ipv6hdr))
440 goto inhdr_error;
441
442 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
443 goto inhdr_error;
444
445 hdr = skb->nh.ipv6h;
446
447 if (hdr->version != 6)
448 goto inhdr_error;
449
450 pkt_len = ntohs(hdr->payload_len);
451
452 if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
453 if (pkt_len + sizeof(struct ipv6hdr) > skb->len)
454 goto inhdr_error;
b38dfee3
HX		 455 if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
456 goto inhdr_error;
1da177e4
LT		 457 }
458 if (hdr->nexthdr == NEXTHDR_HOP && check_hbh_len(skb))
789bc3e5 459 goto inhdr_error;
1da177e4 460
789bc3e5 461 nf_bridge_put(skb->nf_bridge);
fdeabdef 462 if (!nf_bridge_alloc(skb))
1da177e4 463 return NF_DROP;
5dce971a
SH		 464 if (!setup_pre_routing(skb))
465 return NF_DROP;
1da177e4
LT		 466
467 NF_HOOK(PF_INET6, NF_IP6_PRE_ROUTING, skb, skb->dev, NULL,
468 br_nf_pre_routing_finish_ipv6);
469
470 return NF_STOLEN;
471
472inhdr_error:
473 return NF_DROP;
474}
475
476/* Direct IPv6 traffic to br_nf_pre_routing_ipv6.
477 * Replicate the checks that IPv4 does on packet reception.
478 * Set skb->dev to the bridge device (i.e. parent of the
479 * receiving device) to make netfilter happy, the REDIRECT
480 * target in particular. Save the original destination IP
481 * address to be able to detect DNAT afterwards. */
482static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
ee02b3a6
SH		 483 const struct net_device *in,
484 const struct net_device *out,
485 int (*okfn)(struct sk_buff *))
1da177e4
LT		 486{
487 struct iphdr *iph;
488 __u32 len;
489 struct sk_buff *skb = *pskb;
1da177e4 490
8b42ec39 491 if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb)) {
1da177e4
LT		 492#ifdef CONFIG_SYSCTL
493 if (!brnf_call_ip6tables)
494 return NF_ACCEPT;
495#endif
496 if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
497 goto out;
498
f8a26028 499 if (skb->protocol == htons(ETH_P_8021Q)) {
cbb042f9 500 skb_pull_rcsum(skb, VLAN_HLEN);
ee02b3a6 501 skb->nh.raw += VLAN_HLEN;
1da177e4
LT		 502 }
503 return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn);
504 }
505#ifdef CONFIG_SYSCTL
506 if (!brnf_call_iptables)
507 return NF_ACCEPT;
508#endif
509
8b42ec39 510 if (skb->protocol != htons(ETH_P_IP) && !IS_VLAN_IP(skb))
1da177e4
LT		 511 return NF_ACCEPT;
512
513 if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
514 goto out;
515
f8a26028 516 if (skb->protocol == htons(ETH_P_8021Q)) {
cbb042f9 517 skb_pull_rcsum(skb, VLAN_HLEN);
ee02b3a6 518 skb->nh.raw += VLAN_HLEN;
1da177e4
LT		 519 }
520
521 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
522 goto inhdr_error;
523
524 iph = skb->nh.iph;
525 if (iph->ihl < 5 || iph->version != 4)
526 goto inhdr_error;
527
789bc3e5 528 if (!pskb_may_pull(skb, 4 * iph->ihl))
1da177e4
LT		 529 goto inhdr_error;
530
531 iph = skb->nh.iph;
789bc3e5 532 if (ip_fast_csum((__u8 *) iph, iph->ihl) != 0)
1da177e4
LT		 533 goto inhdr_error;
534
535 len = ntohs(iph->tot_len);
789bc3e5 536 if (skb->len < len || len < 4 * iph->ihl)
1da177e4
LT		 537 goto inhdr_error;
538
b38dfee3 539 pskb_trim_rcsum(skb, len);
1da177e4 540
789bc3e5 541 nf_bridge_put(skb->nf_bridge);
fdeabdef 542 if (!nf_bridge_alloc(skb))
1da177e4 543 return NF_DROP;
5dce971a
SH		 544 if (!setup_pre_routing(skb))
545 return NF_DROP;
1da177e4
LT		 546 store_orig_dstaddr(skb);
547
548 NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
549 br_nf_pre_routing_finish);
550
551 return NF_STOLEN;
552
553inhdr_error:
789bc3e5 554// IP_INC_STATS_BH(IpInHdrErrors);
1da177e4
LT		 555out:
556 return NF_DROP;
557}
558
559
560/* PF_BRIDGE/LOCAL_IN ************************************************/
561/* The packet is locally destined, which requires a real
562 * dst_entry, so detach the fake one. On the way up, the
563 * packet would pass through PRE_ROUTING again (which already
564 * took place when the packet entered the bridge), but we
565 * register an IPv4 PRE_ROUTING 'sabotage' hook that will
566 * prevent this from happening. */
567static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb,
789bc3e5
SH		 568 const struct net_device *in,
569 const struct net_device *out,
570 int (*okfn)(struct sk_buff *))
1da177e4
LT		 571{
572 struct sk_buff *skb = *pskb;
573
574 if (skb->dst == (struct dst_entry *)&__fake_rtable) {
575 dst_release(skb->dst);
576 skb->dst = NULL;
577 }
578
579 return NF_ACCEPT;
580}
581
1da177e4
LT		 582/* PF_BRIDGE/FORWARD *************************************************/
583static int br_nf_forward_finish(struct sk_buff *skb)
584{
585 struct nf_bridge_info *nf_bridge = skb->nf_bridge;
586 struct net_device *in;
1da177e4 587
8b42ec39 588 if (skb->protocol != htons(ETH_P_ARP) && !IS_VLAN_ARP(skb)) {
1da177e4
LT		 589 in = nf_bridge->physindev;
590 if (nf_bridge->mask & BRNF_PKT_TYPE) {
591 skb->pkt_type = PACKET_OTHERHOST;
592 nf_bridge->mask ^= BRNF_PKT_TYPE;
593 }
594 } else {
595 in = *((struct net_device **)(skb->cb));
596 }
f8a26028 597 if (skb->protocol == htons(ETH_P_8021Q)) {
1da177e4
LT		 598 skb_push(skb, VLAN_HLEN);
599 skb->nh.raw -= VLAN_HLEN;
600 }
601 NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in,
789bc3e5 602 skb->dev, br_forward_finish, 1);
1da177e4
LT		 603 return 0;
604}
605
606/* This is the 'purely bridged' case. For IP, we pass the packet to
607 * netfilter with indev and outdev set to the bridge device,
608 * but we are still able to filter on the 'real' indev/outdev
609 * because of the physdev module. For ARP, indev and outdev are the
610 * bridge ports. */
611static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb,
789bc3e5
SH		 612 const struct net_device *in,
613 const struct net_device *out,
614 int (*okfn)(struct sk_buff *))
1da177e4
LT		 615{
616 struct sk_buff *skb = *pskb;
617 struct nf_bridge_info *nf_bridge;
5dce971a 618 struct net_device *parent;
1da177e4
LT		 619 int pf;
620
621 if (!skb->nf_bridge)
622 return NF_ACCEPT;
623
5dce971a
SH		 624 parent = bridge_parent(out);
625 if (!parent)
626 return NF_DROP;
627
8b42ec39 628 if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb))
1da177e4
LT		 629 pf = PF_INET;
630 else
631 pf = PF_INET6;
632
f8a26028 633 if (skb->protocol == htons(ETH_P_8021Q)) {
1da177e4
LT		 634 skb_pull(*pskb, VLAN_HLEN);
635 (*pskb)->nh.raw += VLAN_HLEN;
636 }
637
1da177e4
LT		 638 nf_bridge = skb->nf_bridge;
639 if (skb->pkt_type == PACKET_OTHERHOST) {
640 skb->pkt_type = PACKET_HOST;
641 nf_bridge->mask |= BRNF_PKT_TYPE;
642 }
643
644 /* The physdev module checks on this */
645 nf_bridge->mask |= BRNF_BRIDGED;
646 nf_bridge->physoutdev = skb->dev;
647
5dce971a
SH		 648 NF_HOOK(pf, NF_IP_FORWARD, skb, bridge_parent(in), parent,
649 br_nf_forward_finish);
1da177e4
LT		 650
651 return NF_STOLEN;
652}
653
654static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb,
789bc3e5
SH		 655 const struct net_device *in,
656 const struct net_device *out,
657 int (*okfn)(struct sk_buff *))
1da177e4
LT		 658{
659 struct sk_buff *skb = *pskb;
1da177e4
LT		 660 struct net_device **d = (struct net_device **)(skb->cb);
661
662#ifdef CONFIG_SYSCTL
663 if (!brnf_call_arptables)
664 return NF_ACCEPT;
665#endif
666
f8a26028 667 if (skb->protocol != htons(ETH_P_ARP)) {
8b42ec39 668 if (!IS_VLAN_ARP(skb))
1da177e4
LT		 669 return NF_ACCEPT;
670 skb_pull(*pskb, VLAN_HLEN);
671 (*pskb)->nh.raw += VLAN_HLEN;
672 }
673
1da177e4 674 if (skb->nh.arph->ar_pln != 4) {
8b42ec39 675 if (IS_VLAN_ARP(skb)) {
1da177e4
LT		 676 skb_push(*pskb, VLAN_HLEN);
677 (*pskb)->nh.raw -= VLAN_HLEN;
678 }
679 return NF_ACCEPT;
680 }
681 *d = (struct net_device *)in;
682 NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in,
683 (struct net_device *)out, br_nf_forward_finish);
684
685 return NF_STOLEN;
686}
687
1da177e4
LT		 688/* PF_BRIDGE/LOCAL_OUT ***********************************************/
689static int br_nf_local_out_finish(struct sk_buff *skb)
690{
f8a26028 691 if (skb->protocol == htons(ETH_P_8021Q)) {
1da177e4
LT		 692 skb_push(skb, VLAN_HLEN);
693 skb->nh.raw -= VLAN_HLEN;
694 }
695
696 NF_HOOK_THRESH(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
789bc3e5 697 br_forward_finish, NF_BR_PRI_FIRST + 1);
1da177e4
LT		 698
699 return 0;
700}
701
702/* This function sees both locally originated IP packets and forwarded
703 * IP packets (in both cases the destination device is a bridge
704 * device). It also sees bridged-and-DNAT'ed packets.
705 * To be able to filter on the physical bridge devices (with the physdev
706 * module), we steal packets destined to a bridge device away from the
707 * PF_INET/FORWARD and PF_INET/OUTPUT hook functions, and give them back later,
708 * when we have determined the real output device. This is done in here.
709 *
710 * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged
711 * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward()
712 * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority
713 * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor
714 * will be executed.
715 * Otherwise, if nf_bridge->physindev is NULL, the bridge-nf code never touched
716 * this packet before, and so the packet was locally originated. We fake
717 * the PF_INET/LOCAL_OUT hook.
718 * Finally, if nf_bridge->physindev isn't NULL, then the packet was IP routed,
719 * so we fake the PF_INET/FORWARD hook. ip_sabotage_out() makes sure
720 * even routed packets that didn't arrive on a bridge interface have their
721 * nf_bridge->physindev set. */
722static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
789bc3e5
SH		 723 const struct net_device *in,
724 const struct net_device *out,
725 int (*okfn)(struct sk_buff *))
1da177e4
LT		 726{
727 struct net_device *realindev, *realoutdev;
728 struct sk_buff *skb = *pskb;
729 struct nf_bridge_info *nf_bridge;
1da177e4
LT		 730 int pf;
731
732 if (!skb->nf_bridge)
733 return NF_ACCEPT;
734
8b42ec39 735 if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb))
1da177e4
LT		 736 pf = PF_INET;
737 else
738 pf = PF_INET6;
739
1da177e4
LT		 740 nf_bridge = skb->nf_bridge;
741 nf_bridge->physoutdev = skb->dev;
742 realindev = nf_bridge->physindev;
743
744 /* Bridged, take PF_BRIDGE/FORWARD.
745 * (see big note in front of br_nf_pre_routing_finish) */
746 if (nf_bridge->mask & BRNF_BRIDGED_DNAT) {
747 if (nf_bridge->mask & BRNF_PKT_TYPE) {
748 skb->pkt_type = PACKET_OTHERHOST;
749 nf_bridge->mask ^= BRNF_PKT_TYPE;
750 }
f8a26028 751 if (skb->protocol == htons(ETH_P_8021Q)) {
1da177e4
LT		 752 skb_push(skb, VLAN_HLEN);
753 skb->nh.raw -= VLAN_HLEN;
754 }
755
756 NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev,
757 skb->dev, br_forward_finish);
758 goto out;
759 }
760 realoutdev = bridge_parent(skb->dev);
5dce971a
SH		 761 if (!realoutdev)
762 return NF_DROP;
1da177e4
LT		 763
764#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
765 /* iptables should match -o br0.x */
766 if (nf_bridge->netoutdev)
767 realoutdev = nf_bridge->netoutdev;
768#endif
f8a26028 769 if (skb->protocol == htons(ETH_P_8021Q)) {
1da177e4
LT		 770 skb_pull(skb, VLAN_HLEN);
771 (*pskb)->nh.raw += VLAN_HLEN;
772 }
773 /* IP forwarded traffic has a physindev, locally
774 * generated traffic hasn't. */
775 if (realindev != NULL) {
789bc3e5 776 if (!(nf_bridge->mask & BRNF_DONT_TAKE_PARENT)) {
5dce971a
SH		 777 struct net_device *parent = bridge_parent(realindev);
778 if (parent)
779 realindev = parent;
780 }
1da177e4
LT		 781
782 NF_HOOK_THRESH(pf, NF_IP_FORWARD, skb, realindev,
783 realoutdev, br_nf_local_out_finish,
784 NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD + 1);
785 } else {
1da177e4
LT		 786 NF_HOOK_THRESH(pf, NF_IP_LOCAL_OUT, skb, realindev,
787 realoutdev, br_nf_local_out_finish,
788 NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1);
789 }
790
791out:
792 return NF_STOLEN;
793}
794
2e2f7aef
PM		 795static int br_nf_dev_queue_xmit(struct sk_buff *skb)
796{
797 if (skb->protocol == htons(ETH_P_IP) &&
798 skb->len > skb->dev->mtu &&
89114afd 799 !skb_is_gso(skb))
2e2f7aef
PM		 800 return ip_fragment(skb, br_dev_queue_push_xmit);
801 else
802 return br_dev_queue_push_xmit(skb);
803}
1da177e4
LT		 804
805/* PF_BRIDGE/POST_ROUTING ********************************************/
806static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
789bc3e5
SH		 807 const struct net_device *in,
808 const struct net_device *out,
809 int (*okfn)(struct sk_buff *))
1da177e4
LT		 810{
811 struct sk_buff *skb = *pskb;
812 struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge;
1da177e4
LT		 813 struct net_device *realoutdev = bridge_parent(skb->dev);
814 int pf;
815
816#ifdef CONFIG_NETFILTER_DEBUG
817 /* Be very paranoid. This probably won't happen anymore, but let's
818 * keep the check just to be sure... */
819 if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) {
820 printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: "
8394e9b2 821 "bad mac.raw pointer.\n");
1da177e4
LT		 822 goto print_error;
823 }
824#endif
825
826 if (!nf_bridge)
827 return NF_ACCEPT;
828
5dce971a
SH		 829 if (!realoutdev)
830 return NF_DROP;
831
8b42ec39 832 if (skb->protocol == htons(ETH_P_IP) || IS_VLAN_IP(skb))
1da177e4
LT		 833 pf = PF_INET;
834 else
835 pf = PF_INET6;
836
837#ifdef CONFIG_NETFILTER_DEBUG
838 if (skb->dst == NULL) {
8394e9b2 839 printk(KERN_INFO "br_netfilter post_routing: skb->dst == NULL\n");
1da177e4
LT		 840 goto print_error;
841 }
1da177e4
LT		 842#endif
843
844 /* We assume any code from br_dev_queue_push_xmit onwards doesn't care
845 * about the value of skb->pkt_type. */
846 if (skb->pkt_type == PACKET_OTHERHOST) {
847 skb->pkt_type = PACKET_HOST;
848 nf_bridge->mask |= BRNF_PKT_TYPE;
849 }
850
f8a26028 851 if (skb->protocol == htons(ETH_P_8021Q)) {
1da177e4
LT		 852 skb_pull(skb, VLAN_HLEN);
853 skb->nh.raw += VLAN_HLEN;
854 }
855
856 nf_bridge_save_header(skb);
857
858#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
859 if (nf_bridge->netoutdev)
860 realoutdev = nf_bridge->netoutdev;
861#endif
862 NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev,
2e2f7aef 863 br_nf_dev_queue_xmit);
1da177e4
LT		 864
865 return NF_STOLEN;
866
867#ifdef CONFIG_NETFILTER_DEBUG
868print_error:
869 if (skb->dev != NULL) {
870 printk("[%s]", skb->dev->name);
178a3259
SH		 871 if (realoutdev)
872 printk("[%s]", realoutdev->name);
1da177e4
LT		 873 }
874 printk(" head:%p, raw:%p, data:%p\n", skb->head, skb->mac.raw,
789bc3e5 875 skb->data);
8394e9b2 876 dump_stack();
1da177e4
LT		 877 return NF_ACCEPT;
878#endif
879}
880
1da177e4
LT		 881/* IP/SABOTAGE *****************************************************/
882/* Don't hand locally destined packets to PF_INET(6)/PRE_ROUTING
883 * for the second time. */
884static unsigned int ip_sabotage_in(unsigned int hook, struct sk_buff **pskb,
789bc3e5
SH		 885 const struct net_device *in,
886 const struct net_device *out,
887 int (*okfn)(struct sk_buff *))
1da177e4
LT		 888{
889 if ((*pskb)->nf_bridge &&
890 !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) {
891 return NF_STOP;
892 }
893
894 return NF_ACCEPT;
895}
896
897/* Postpone execution of PF_INET(6)/FORWARD, PF_INET(6)/LOCAL_OUT
898 * and PF_INET(6)/POST_ROUTING until we have done the forwarding
899 * decision in the bridge code and have determined nf_bridge->physoutdev. */
900static unsigned int ip_sabotage_out(unsigned int hook, struct sk_buff **pskb,
789bc3e5
SH		 901 const struct net_device *in,
902 const struct net_device *out,
903 int (*okfn)(struct sk_buff *))
1da177e4
LT		 904{
905 struct sk_buff *skb = *pskb;
906
907 if ((out->hard_start_xmit == br_dev_xmit &&
789bc3e5 908 okfn != br_nf_forward_finish &&
2e2f7aef 909 okfn != br_nf_local_out_finish && okfn != br_nf_dev_queue_xmit)
1da177e4
LT		 910#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
911 || ((out->priv_flags & IFF_802_1Q_VLAN) &&
789bc3e5 912 VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit)
1da177e4
LT		 913#endif
914 ) {
915 struct nf_bridge_info *nf_bridge;
916
917 if (!skb->nf_bridge) {
918#ifdef CONFIG_SYSCTL
919 /* This code is executed while in the IP(v6) stack,
920 the version should be 4 or 6. We can't use
921 skb->protocol because that isn't set on
922 PF_INET(6)/LOCAL_OUT. */
923 struct iphdr *ip = skb->nh.iph;
924
925 if (ip->version == 4 && !brnf_call_iptables)
926 return NF_ACCEPT;
927 else if (ip->version == 6 && !brnf_call_ip6tables)
928 return NF_ACCEPT;
10ea6ac8
PM		 929 else if (!brnf_deferred_hooks)
930 return NF_ACCEPT;
1da177e4
LT		 931#endif
932 if (hook == NF_IP_POST_ROUTING)
933 return NF_ACCEPT;
934 if (!nf_bridge_alloc(skb))
935 return NF_DROP;
936 }
937
938 nf_bridge = skb->nf_bridge;
939
940 /* This frame will arrive on PF_BRIDGE/LOCAL_OUT and we
941 * will need the indev then. For a brouter, the real indev
942 * can be a bridge port, so we make sure br_nf_local_out()
943 * doesn't use the bridge parent of the indev by using
944 * the BRNF_DONT_TAKE_PARENT mask. */
945 if (hook == NF_IP_FORWARD && nf_bridge->physindev == NULL) {
9666dae5 946 nf_bridge->mask |= BRNF_DONT_TAKE_PARENT;
1da177e4
LT		 947 nf_bridge->physindev = (struct net_device *)in;
948 }
949#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
950 /* the iptables outdev is br0.x, not br0 */
951 if (out->priv_flags & IFF_802_1Q_VLAN)
952 nf_bridge->netoutdev = (struct net_device *)out;
953#endif
954 return NF_STOP;
955 }
956
957 return NF_ACCEPT;
958}
959
960/* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent
961 * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input.
962 * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because
963 * ip_refrag() can return NF_STOLEN. */
964static struct nf_hook_ops br_nf_ops[] = {
965 { .hook = br_nf_pre_routing,
966 .owner = THIS_MODULE,
967 .pf = PF_BRIDGE,
968 .hooknum = NF_BR_PRE_ROUTING,
969 .priority = NF_BR_PRI_BRNF, },
970 { .hook = br_nf_local_in,
971 .owner = THIS_MODULE,
972 .pf = PF_BRIDGE,
973 .hooknum = NF_BR_LOCAL_IN,
974 .priority = NF_BR_PRI_BRNF, },
975 { .hook = br_nf_forward_ip,
976 .owner = THIS_MODULE,
977 .pf = PF_BRIDGE,
978 .hooknum = NF_BR_FORWARD,
979 .priority = NF_BR_PRI_BRNF - 1, },
980 { .hook = br_nf_forward_arp,
981 .owner = THIS_MODULE,
982 .pf = PF_BRIDGE,
983 .hooknum = NF_BR_FORWARD,
984 .priority = NF_BR_PRI_BRNF, },
985 { .hook = br_nf_local_out,
986 .owner = THIS_MODULE,
987 .pf = PF_BRIDGE,
988 .hooknum = NF_BR_LOCAL_OUT,
989 .priority = NF_BR_PRI_FIRST, },
990 { .hook = br_nf_post_routing,
991 .owner = THIS_MODULE,
992 .pf = PF_BRIDGE,
993 .hooknum = NF_BR_POST_ROUTING,
994 .priority = NF_BR_PRI_LAST, },
995 { .hook = ip_sabotage_in,
996 .owner = THIS_MODULE,
997 .pf = PF_INET,
998 .hooknum = NF_IP_PRE_ROUTING,
999 .priority = NF_IP_PRI_FIRST, },
1000 { .hook = ip_sabotage_in,
1001 .owner = THIS_MODULE,
1002 .pf = PF_INET6,
1003 .hooknum = NF_IP6_PRE_ROUTING,
1004 .priority = NF_IP6_PRI_FIRST, },
1005 { .hook = ip_sabotage_out,
1006 .owner = THIS_MODULE,
1007 .pf = PF_INET,
1008 .hooknum = NF_IP_FORWARD,
1009 .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, },
1010 { .hook = ip_sabotage_out,
1011 .owner = THIS_MODULE,
1012 .pf = PF_INET6,
1013 .hooknum = NF_IP6_FORWARD,
1014 .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_FORWARD, },
1015 { .hook = ip_sabotage_out,
1016 .owner = THIS_MODULE,
1017 .pf = PF_INET,
1018 .hooknum = NF_IP_LOCAL_OUT,
1019 .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, },
1020 { .hook = ip_sabotage_out,
1021 .owner = THIS_MODULE,
1022 .pf = PF_INET6,
1023 .hooknum = NF_IP6_LOCAL_OUT,
1024 .priority = NF_IP6_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, },
1025 { .hook = ip_sabotage_out,
1026 .owner = THIS_MODULE,
1027 .pf = PF_INET,
1028 .hooknum = NF_IP_POST_ROUTING,
1029 .priority = NF_IP_PRI_FIRST, },
1030 { .hook = ip_sabotage_out,
1031 .owner = THIS_MODULE,
1032 .pf = PF_INET6,
1033 .hooknum = NF_IP6_POST_ROUTING,
1034 .priority = NF_IP6_PRI_FIRST, },
1035};
1036
1037#ifdef CONFIG_SYSCTL
1038static
789bc3e5
SH		 1039int brnf_sysctl_call_tables(ctl_table * ctl, int write, struct file *filp,
1040 void __user * buffer, size_t * lenp, loff_t * ppos)
1da177e4
LT		 1041{
1042 int ret;
1043
1044 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1045
1046 if (write && *(int *)(ctl->data))
1047 *(int *)(ctl->data) = 1;
1048 return ret;
1049}
1050
1051static ctl_table brnf_table[] = {
1052 {
1053 .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES,
1054 .procname = "bridge-nf-call-arptables",
1055 .data = &brnf_call_arptables,
1056 .maxlen = sizeof(int),
1057 .mode = 0644,
1058 .proc_handler = &brnf_sysctl_call_tables,
1059 },
1060 {
1061 .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES,
1062 .procname = "bridge-nf-call-iptables",
1063 .data = &brnf_call_iptables,
1064 .maxlen = sizeof(int),
1065 .mode = 0644,
1066 .proc_handler = &brnf_sysctl_call_tables,
1067 },
1068 {
1069 .ctl_name = NET_BRIDGE_NF_CALL_IP6TABLES,
1070 .procname = "bridge-nf-call-ip6tables",
1071 .data = &brnf_call_ip6tables,
1072 .maxlen = sizeof(int),
1073 .mode = 0644,
1074 .proc_handler = &brnf_sysctl_call_tables,
1075 },
1076 {
1077 .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED,
1078 .procname = "bridge-nf-filter-vlan-tagged",
1079 .data = &brnf_filter_vlan_tagged,
1080 .maxlen = sizeof(int),
1081 .mode = 0644,
1082 .proc_handler = &brnf_sysctl_call_tables,
1083 },
1084 { .ctl_name = 0 }
1085};
1086
1087static ctl_table brnf_bridge_table[] = {
1088 {
1089 .ctl_name = NET_BRIDGE,
1090 .procname = "bridge",
1091 .mode = 0555,
1092 .child = brnf_table,
1093 },
1094 { .ctl_name = 0 }
1095};
1096
1097static ctl_table brnf_net_table[] = {
1098 {
1099 .ctl_name = CTL_NET,
1100 .procname = "net",
1101 .mode = 0555,
1102 .child = brnf_bridge_table,
1103 },
1104 { .ctl_name = 0 }
1105};
1106#endif
1107
1108int br_netfilter_init(void)
1109{
1110 int i;
1111
1112 for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) {
1113 int ret;
1114
1115 if ((ret = nf_register_hook(&br_nf_ops[i])) >= 0)
1116 continue;
1117
1118 while (i--)
1119 nf_unregister_hook(&br_nf_ops[i]);
1120
1121 return ret;
1122 }
1123
1124#ifdef CONFIG_SYSCTL
1125 brnf_sysctl_header = register_sysctl_table(brnf_net_table, 0);
1126 if (brnf_sysctl_header == NULL) {
789bc3e5
SH		 1127 printk(KERN_WARNING
1128 "br_netfilter: can't register to sysctl.\n");
1da177e4
LT		 1129 for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++)
1130 nf_unregister_hook(&br_nf_ops[i]);
1131 return -EFAULT;
1132 }
1133#endif
1134
1135 printk(KERN_NOTICE "Bridge firewalling registered\n");
1136
1137 return 0;
1138}
1139
1140void br_netfilter_fini(void)
1141{
1142 int i;
1143
1144 for (i = ARRAY_SIZE(br_nf_ops) - 1; i >= 0; i--)
1145 nf_unregister_hook(&br_nf_ops[i]);
1146#ifdef CONFIG_SYSCTL
1147 unregister_sysctl_table(brnf_sysctl_header);
1148#endif
1149}
Linux 6.x block layer and io_uring tree(s)