1 #include <linux/init.h>
2 #include <linux/kernel.h>
3 #include <linux/netdevice.h>
4 #include <net/net_namespace.h>
5 #include <net/netfilter/nf_tables.h>
6 #include <linux/netfilter_ipv4.h>
7 #include <linux/netfilter_ipv6.h>
8 #include <linux/netfilter_bridge.h>
9 #include <linux/netfilter_arp.h>
10 #include <net/netfilter/nf_tables_ipv4.h>
11 #include <net/netfilter/nf_tables_ipv6.h>
13 #ifdef CONFIG_NF_TABLES_IPV4
14 static unsigned int nft_do_chain_ipv4(void *priv,
16 const struct nf_hook_state *state)
18 struct nft_pktinfo pkt;
20 nft_set_pktinfo(&pkt, skb, state);
21 nft_set_pktinfo_ipv4(&pkt, skb);
23 return nft_do_chain(&pkt, priv);
26 static const struct nft_chain_type nft_chain_filter_ipv4 = {
28 .type = NFT_CHAIN_T_DEFAULT,
29 .family = NFPROTO_IPV4,
30 .hook_mask = (1 << NF_INET_LOCAL_IN) |
31 (1 << NF_INET_LOCAL_OUT) |
32 (1 << NF_INET_FORWARD) |
33 (1 << NF_INET_PRE_ROUTING) |
34 (1 << NF_INET_POST_ROUTING),
36 [NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
37 [NF_INET_LOCAL_OUT] = nft_do_chain_ipv4,
38 [NF_INET_FORWARD] = nft_do_chain_ipv4,
39 [NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
40 [NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
44 static void nft_chain_filter_ipv4_init(void)
46 nft_register_chain_type(&nft_chain_filter_ipv4);
48 static void nft_chain_filter_ipv4_fini(void)
50 nft_unregister_chain_type(&nft_chain_filter_ipv4);
54 static inline void nft_chain_filter_ipv4_init(void) {}
55 static inline void nft_chain_filter_ipv4_fini(void) {}
56 #endif /* CONFIG_NF_TABLES_IPV4 */
58 #ifdef CONFIG_NF_TABLES_ARP
59 static unsigned int nft_do_chain_arp(void *priv, struct sk_buff *skb,
60 const struct nf_hook_state *state)
62 struct nft_pktinfo pkt;
64 nft_set_pktinfo(&pkt, skb, state);
65 nft_set_pktinfo_unspec(&pkt, skb);
67 return nft_do_chain(&pkt, priv);
70 static const struct nft_chain_type nft_chain_filter_arp = {
72 .type = NFT_CHAIN_T_DEFAULT,
73 .family = NFPROTO_ARP,
75 .hook_mask = (1 << NF_ARP_IN) |
78 [NF_ARP_IN] = nft_do_chain_arp,
79 [NF_ARP_OUT] = nft_do_chain_arp,
83 static void nft_chain_filter_arp_init(void)
85 nft_register_chain_type(&nft_chain_filter_arp);
88 static void nft_chain_filter_arp_fini(void)
90 nft_unregister_chain_type(&nft_chain_filter_arp);
93 static inline void nft_chain_filter_arp_init(void) {}
94 static inline void nft_chain_filter_arp_fini(void) {}
95 #endif /* CONFIG_NF_TABLES_ARP */
97 #ifdef CONFIG_NF_TABLES_IPV6
98 static unsigned int nft_do_chain_ipv6(void *priv,
100 const struct nf_hook_state *state)
102 struct nft_pktinfo pkt;
104 nft_set_pktinfo(&pkt, skb, state);
105 nft_set_pktinfo_ipv6(&pkt, skb);
107 return nft_do_chain(&pkt, priv);
110 static const struct nft_chain_type nft_chain_filter_ipv6 = {
112 .type = NFT_CHAIN_T_DEFAULT,
113 .family = NFPROTO_IPV6,
114 .hook_mask = (1 << NF_INET_LOCAL_IN) |
115 (1 << NF_INET_LOCAL_OUT) |
116 (1 << NF_INET_FORWARD) |
117 (1 << NF_INET_PRE_ROUTING) |
118 (1 << NF_INET_POST_ROUTING),
120 [NF_INET_LOCAL_IN] = nft_do_chain_ipv6,
121 [NF_INET_LOCAL_OUT] = nft_do_chain_ipv6,
122 [NF_INET_FORWARD] = nft_do_chain_ipv6,
123 [NF_INET_PRE_ROUTING] = nft_do_chain_ipv6,
124 [NF_INET_POST_ROUTING] = nft_do_chain_ipv6,
128 static void nft_chain_filter_ipv6_init(void)
130 nft_register_chain_type(&nft_chain_filter_ipv6);
133 static void nft_chain_filter_ipv6_fini(void)
135 nft_unregister_chain_type(&nft_chain_filter_ipv6);
138 static inline void nft_chain_filter_ipv6_init(void) {}
139 static inline void nft_chain_filter_ipv6_fini(void) {}
140 #endif /* CONFIG_NF_TABLES_IPV6 */
142 #ifdef CONFIG_NF_TABLES_INET
143 static unsigned int nft_do_chain_inet(void *priv, struct sk_buff *skb,
144 const struct nf_hook_state *state)
146 struct nft_pktinfo pkt;
148 nft_set_pktinfo(&pkt, skb, state);
152 nft_set_pktinfo_ipv4(&pkt, skb);
155 nft_set_pktinfo_ipv6(&pkt, skb);
161 return nft_do_chain(&pkt, priv);
164 static unsigned int nft_do_chain_inet_ingress(void *priv, struct sk_buff *skb,
165 const struct nf_hook_state *state)
167 struct nf_hook_state ingress_state = *state;
168 struct nft_pktinfo pkt;
170 switch (skb->protocol) {
171 case htons(ETH_P_IP):
172 /* Original hook is NFPROTO_NETDEV and NF_NETDEV_INGRESS. */
173 ingress_state.pf = NFPROTO_IPV4;
174 ingress_state.hook = NF_INET_INGRESS;
175 nft_set_pktinfo(&pkt, skb, &ingress_state);
177 if (nft_set_pktinfo_ipv4_ingress(&pkt, skb) < 0)
180 case htons(ETH_P_IPV6):
181 ingress_state.pf = NFPROTO_IPV6;
182 ingress_state.hook = NF_INET_INGRESS;
183 nft_set_pktinfo(&pkt, skb, &ingress_state);
185 if (nft_set_pktinfo_ipv6_ingress(&pkt, skb) < 0)
192 return nft_do_chain(&pkt, priv);
195 static const struct nft_chain_type nft_chain_filter_inet = {
197 .type = NFT_CHAIN_T_DEFAULT,
198 .family = NFPROTO_INET,
199 .hook_mask = (1 << NF_INET_INGRESS) |
200 (1 << NF_INET_LOCAL_IN) |
201 (1 << NF_INET_LOCAL_OUT) |
202 (1 << NF_INET_FORWARD) |
203 (1 << NF_INET_PRE_ROUTING) |
204 (1 << NF_INET_POST_ROUTING),
206 [NF_INET_INGRESS] = nft_do_chain_inet_ingress,
207 [NF_INET_LOCAL_IN] = nft_do_chain_inet,
208 [NF_INET_LOCAL_OUT] = nft_do_chain_inet,
209 [NF_INET_FORWARD] = nft_do_chain_inet,
210 [NF_INET_PRE_ROUTING] = nft_do_chain_inet,
211 [NF_INET_POST_ROUTING] = nft_do_chain_inet,
215 static void nft_chain_filter_inet_init(void)
217 nft_register_chain_type(&nft_chain_filter_inet);
220 static void nft_chain_filter_inet_fini(void)
222 nft_unregister_chain_type(&nft_chain_filter_inet);
225 static inline void nft_chain_filter_inet_init(void) {}
226 static inline void nft_chain_filter_inet_fini(void) {}
227 #endif /* CONFIG_NF_TABLES_IPV6 */
229 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
231 nft_do_chain_bridge(void *priv,
233 const struct nf_hook_state *state)
235 struct nft_pktinfo pkt;
237 nft_set_pktinfo(&pkt, skb, state);
239 switch (eth_hdr(skb)->h_proto) {
240 case htons(ETH_P_IP):
241 nft_set_pktinfo_ipv4_validate(&pkt, skb);
243 case htons(ETH_P_IPV6):
244 nft_set_pktinfo_ipv6_validate(&pkt, skb);
247 nft_set_pktinfo_unspec(&pkt, skb);
251 return nft_do_chain(&pkt, priv);
254 static const struct nft_chain_type nft_chain_filter_bridge = {
256 .type = NFT_CHAIN_T_DEFAULT,
257 .family = NFPROTO_BRIDGE,
258 .hook_mask = (1 << NF_BR_PRE_ROUTING) |
259 (1 << NF_BR_LOCAL_IN) |
260 (1 << NF_BR_FORWARD) |
261 (1 << NF_BR_LOCAL_OUT) |
262 (1 << NF_BR_POST_ROUTING),
264 [NF_BR_PRE_ROUTING] = nft_do_chain_bridge,
265 [NF_BR_LOCAL_IN] = nft_do_chain_bridge,
266 [NF_BR_FORWARD] = nft_do_chain_bridge,
267 [NF_BR_LOCAL_OUT] = nft_do_chain_bridge,
268 [NF_BR_POST_ROUTING] = nft_do_chain_bridge,
272 static void nft_chain_filter_bridge_init(void)
274 nft_register_chain_type(&nft_chain_filter_bridge);
277 static void nft_chain_filter_bridge_fini(void)
279 nft_unregister_chain_type(&nft_chain_filter_bridge);
282 static inline void nft_chain_filter_bridge_init(void) {}
283 static inline void nft_chain_filter_bridge_fini(void) {}
284 #endif /* CONFIG_NF_TABLES_BRIDGE */
286 #ifdef CONFIG_NF_TABLES_NETDEV
287 static unsigned int nft_do_chain_netdev(void *priv, struct sk_buff *skb,
288 const struct nf_hook_state *state)
290 struct nft_pktinfo pkt;
292 nft_set_pktinfo(&pkt, skb, state);
294 switch (skb->protocol) {
295 case htons(ETH_P_IP):
296 nft_set_pktinfo_ipv4_validate(&pkt, skb);
298 case htons(ETH_P_IPV6):
299 nft_set_pktinfo_ipv6_validate(&pkt, skb);
302 nft_set_pktinfo_unspec(&pkt, skb);
306 return nft_do_chain(&pkt, priv);
309 static const struct nft_chain_type nft_chain_filter_netdev = {
311 .type = NFT_CHAIN_T_DEFAULT,
312 .family = NFPROTO_NETDEV,
313 .hook_mask = (1 << NF_NETDEV_INGRESS),
315 [NF_NETDEV_INGRESS] = nft_do_chain_netdev,
319 static void nft_netdev_event(unsigned long event, struct net_device *dev,
322 struct nft_base_chain *basechain = nft_base_chain(ctx->chain);
323 struct nft_hook *hook, *found = NULL;
326 if (event != NETDEV_UNREGISTER)
329 list_for_each_entry(hook, &basechain->hook_list, list) {
330 if (hook->ops.dev == dev)
339 nf_unregister_net_hook(ctx->net, &found->ops);
340 list_del_rcu(&found->list);
341 kfree_rcu(found, rcu);
345 /* UNREGISTER events are also happening on netns exit.
347 * Although nf_tables core releases all tables/chains, only this event
348 * handler provides guarantee that hook->ops.dev is still accessible,
349 * so we cannot skip exiting net namespaces.
351 __nft_release_basechain(ctx);
354 static int nf_tables_netdev_event(struct notifier_block *this,
355 unsigned long event, void *ptr)
357 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
358 struct nft_table *table;
359 struct nft_chain *chain, *nr;
360 struct nft_ctx ctx = {
364 if (event != NETDEV_UNREGISTER &&
365 event != NETDEV_CHANGENAME)
368 mutex_lock(&ctx.net->nft.commit_mutex);
369 list_for_each_entry(table, &ctx.net->nft.tables, list) {
370 if (table->family != NFPROTO_NETDEV)
373 ctx.family = table->family;
375 list_for_each_entry_safe(chain, nr, &table->chains, list) {
376 if (!nft_is_base_chain(chain))
380 nft_netdev_event(event, dev, &ctx);
383 mutex_unlock(&ctx.net->nft.commit_mutex);
388 static struct notifier_block nf_tables_netdev_notifier = {
389 .notifier_call = nf_tables_netdev_event,
392 static int nft_chain_filter_netdev_init(void)
396 nft_register_chain_type(&nft_chain_filter_netdev);
398 err = register_netdevice_notifier(&nf_tables_netdev_notifier);
400 goto err_register_netdevice_notifier;
404 err_register_netdevice_notifier:
405 nft_unregister_chain_type(&nft_chain_filter_netdev);
410 static void nft_chain_filter_netdev_fini(void)
412 nft_unregister_chain_type(&nft_chain_filter_netdev);
413 unregister_netdevice_notifier(&nf_tables_netdev_notifier);
416 static inline int nft_chain_filter_netdev_init(void) { return 0; }
417 static inline void nft_chain_filter_netdev_fini(void) {}
418 #endif /* CONFIG_NF_TABLES_NETDEV */
420 int __init nft_chain_filter_init(void)
424 err = nft_chain_filter_netdev_init();
428 nft_chain_filter_ipv4_init();
429 nft_chain_filter_ipv6_init();
430 nft_chain_filter_arp_init();
431 nft_chain_filter_inet_init();
432 nft_chain_filter_bridge_init();
437 void nft_chain_filter_fini(void)
439 nft_chain_filter_bridge_fini();
440 nft_chain_filter_inet_fini();
441 nft_chain_filter_arp_fini();
442 nft_chain_filter_ipv6_fini();
443 nft_chain_filter_ipv4_fini();
444 nft_chain_filter_netdev_fini();