1 #include <linux/init.h>
2 #include <linux/kernel.h>
3 #include <linux/netdevice.h>
4 #include <net/net_namespace.h>
5 #include <net/netns/generic.h>
6 #include <net/netfilter/nf_tables.h>
7 #include <linux/netfilter_ipv4.h>
8 #include <linux/netfilter_ipv6.h>
9 #include <linux/netfilter_bridge.h>
10 #include <linux/netfilter_arp.h>
11 #include <net/netfilter/nf_tables_ipv4.h>
12 #include <net/netfilter/nf_tables_ipv6.h>
14 extern unsigned int nf_tables_net_id;
16 #ifdef CONFIG_NF_TABLES_IPV4
17 static unsigned int nft_do_chain_ipv4(void *priv,
19 const struct nf_hook_state *state)
21 struct nft_pktinfo pkt;
23 nft_set_pktinfo(&pkt, skb, state);
24 nft_set_pktinfo_ipv4(&pkt, skb);
26 return nft_do_chain(&pkt, priv);
29 static const struct nft_chain_type nft_chain_filter_ipv4 = {
31 .type = NFT_CHAIN_T_DEFAULT,
32 .family = NFPROTO_IPV4,
33 .hook_mask = (1 << NF_INET_LOCAL_IN) |
34 (1 << NF_INET_LOCAL_OUT) |
35 (1 << NF_INET_FORWARD) |
36 (1 << NF_INET_PRE_ROUTING) |
37 (1 << NF_INET_POST_ROUTING),
39 [NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
40 [NF_INET_LOCAL_OUT] = nft_do_chain_ipv4,
41 [NF_INET_FORWARD] = nft_do_chain_ipv4,
42 [NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
43 [NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
47 static void nft_chain_filter_ipv4_init(void)
49 nft_register_chain_type(&nft_chain_filter_ipv4);
51 static void nft_chain_filter_ipv4_fini(void)
53 nft_unregister_chain_type(&nft_chain_filter_ipv4);
57 static inline void nft_chain_filter_ipv4_init(void) {}
58 static inline void nft_chain_filter_ipv4_fini(void) {}
59 #endif /* CONFIG_NF_TABLES_IPV4 */
61 #ifdef CONFIG_NF_TABLES_ARP
62 static unsigned int nft_do_chain_arp(void *priv, struct sk_buff *skb,
63 const struct nf_hook_state *state)
65 struct nft_pktinfo pkt;
67 nft_set_pktinfo(&pkt, skb, state);
68 nft_set_pktinfo_unspec(&pkt, skb);
70 return nft_do_chain(&pkt, priv);
73 static const struct nft_chain_type nft_chain_filter_arp = {
75 .type = NFT_CHAIN_T_DEFAULT,
76 .family = NFPROTO_ARP,
78 .hook_mask = (1 << NF_ARP_IN) |
81 [NF_ARP_IN] = nft_do_chain_arp,
82 [NF_ARP_OUT] = nft_do_chain_arp,
86 static void nft_chain_filter_arp_init(void)
88 nft_register_chain_type(&nft_chain_filter_arp);
91 static void nft_chain_filter_arp_fini(void)
93 nft_unregister_chain_type(&nft_chain_filter_arp);
96 static inline void nft_chain_filter_arp_init(void) {}
97 static inline void nft_chain_filter_arp_fini(void) {}
98 #endif /* CONFIG_NF_TABLES_ARP */
100 #ifdef CONFIG_NF_TABLES_IPV6
101 static unsigned int nft_do_chain_ipv6(void *priv,
103 const struct nf_hook_state *state)
105 struct nft_pktinfo pkt;
107 nft_set_pktinfo(&pkt, skb, state);
108 nft_set_pktinfo_ipv6(&pkt, skb);
110 return nft_do_chain(&pkt, priv);
113 static const struct nft_chain_type nft_chain_filter_ipv6 = {
115 .type = NFT_CHAIN_T_DEFAULT,
116 .family = NFPROTO_IPV6,
117 .hook_mask = (1 << NF_INET_LOCAL_IN) |
118 (1 << NF_INET_LOCAL_OUT) |
119 (1 << NF_INET_FORWARD) |
120 (1 << NF_INET_PRE_ROUTING) |
121 (1 << NF_INET_POST_ROUTING),
123 [NF_INET_LOCAL_IN] = nft_do_chain_ipv6,
124 [NF_INET_LOCAL_OUT] = nft_do_chain_ipv6,
125 [NF_INET_FORWARD] = nft_do_chain_ipv6,
126 [NF_INET_PRE_ROUTING] = nft_do_chain_ipv6,
127 [NF_INET_POST_ROUTING] = nft_do_chain_ipv6,
131 static void nft_chain_filter_ipv6_init(void)
133 nft_register_chain_type(&nft_chain_filter_ipv6);
136 static void nft_chain_filter_ipv6_fini(void)
138 nft_unregister_chain_type(&nft_chain_filter_ipv6);
141 static inline void nft_chain_filter_ipv6_init(void) {}
142 static inline void nft_chain_filter_ipv6_fini(void) {}
143 #endif /* CONFIG_NF_TABLES_IPV6 */
145 #ifdef CONFIG_NF_TABLES_INET
146 static unsigned int nft_do_chain_inet(void *priv, struct sk_buff *skb,
147 const struct nf_hook_state *state)
149 struct nft_pktinfo pkt;
151 nft_set_pktinfo(&pkt, skb, state);
155 nft_set_pktinfo_ipv4(&pkt, skb);
158 nft_set_pktinfo_ipv6(&pkt, skb);
164 return nft_do_chain(&pkt, priv);
167 static unsigned int nft_do_chain_inet_ingress(void *priv, struct sk_buff *skb,
168 const struct nf_hook_state *state)
170 struct nf_hook_state ingress_state = *state;
171 struct nft_pktinfo pkt;
173 switch (skb->protocol) {
174 case htons(ETH_P_IP):
175 /* Original hook is NFPROTO_NETDEV and NF_NETDEV_INGRESS. */
176 ingress_state.pf = NFPROTO_IPV4;
177 ingress_state.hook = NF_INET_INGRESS;
178 nft_set_pktinfo(&pkt, skb, &ingress_state);
180 if (nft_set_pktinfo_ipv4_ingress(&pkt, skb) < 0)
183 case htons(ETH_P_IPV6):
184 ingress_state.pf = NFPROTO_IPV6;
185 ingress_state.hook = NF_INET_INGRESS;
186 nft_set_pktinfo(&pkt, skb, &ingress_state);
188 if (nft_set_pktinfo_ipv6_ingress(&pkt, skb) < 0)
195 return nft_do_chain(&pkt, priv);
198 static const struct nft_chain_type nft_chain_filter_inet = {
200 .type = NFT_CHAIN_T_DEFAULT,
201 .family = NFPROTO_INET,
202 .hook_mask = (1 << NF_INET_INGRESS) |
203 (1 << NF_INET_LOCAL_IN) |
204 (1 << NF_INET_LOCAL_OUT) |
205 (1 << NF_INET_FORWARD) |
206 (1 << NF_INET_PRE_ROUTING) |
207 (1 << NF_INET_POST_ROUTING),
209 [NF_INET_INGRESS] = nft_do_chain_inet_ingress,
210 [NF_INET_LOCAL_IN] = nft_do_chain_inet,
211 [NF_INET_LOCAL_OUT] = nft_do_chain_inet,
212 [NF_INET_FORWARD] = nft_do_chain_inet,
213 [NF_INET_PRE_ROUTING] = nft_do_chain_inet,
214 [NF_INET_POST_ROUTING] = nft_do_chain_inet,
218 static void nft_chain_filter_inet_init(void)
220 nft_register_chain_type(&nft_chain_filter_inet);
223 static void nft_chain_filter_inet_fini(void)
225 nft_unregister_chain_type(&nft_chain_filter_inet);
228 static inline void nft_chain_filter_inet_init(void) {}
229 static inline void nft_chain_filter_inet_fini(void) {}
230 #endif /* CONFIG_NF_TABLES_IPV6 */
232 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
234 nft_do_chain_bridge(void *priv,
236 const struct nf_hook_state *state)
238 struct nft_pktinfo pkt;
240 nft_set_pktinfo(&pkt, skb, state);
242 switch (eth_hdr(skb)->h_proto) {
243 case htons(ETH_P_IP):
244 nft_set_pktinfo_ipv4_validate(&pkt, skb);
246 case htons(ETH_P_IPV6):
247 nft_set_pktinfo_ipv6_validate(&pkt, skb);
250 nft_set_pktinfo_unspec(&pkt, skb);
254 return nft_do_chain(&pkt, priv);
257 static const struct nft_chain_type nft_chain_filter_bridge = {
259 .type = NFT_CHAIN_T_DEFAULT,
260 .family = NFPROTO_BRIDGE,
261 .hook_mask = (1 << NF_BR_PRE_ROUTING) |
262 (1 << NF_BR_LOCAL_IN) |
263 (1 << NF_BR_FORWARD) |
264 (1 << NF_BR_LOCAL_OUT) |
265 (1 << NF_BR_POST_ROUTING),
267 [NF_BR_PRE_ROUTING] = nft_do_chain_bridge,
268 [NF_BR_LOCAL_IN] = nft_do_chain_bridge,
269 [NF_BR_FORWARD] = nft_do_chain_bridge,
270 [NF_BR_LOCAL_OUT] = nft_do_chain_bridge,
271 [NF_BR_POST_ROUTING] = nft_do_chain_bridge,
275 static void nft_chain_filter_bridge_init(void)
277 nft_register_chain_type(&nft_chain_filter_bridge);
280 static void nft_chain_filter_bridge_fini(void)
282 nft_unregister_chain_type(&nft_chain_filter_bridge);
285 static inline void nft_chain_filter_bridge_init(void) {}
286 static inline void nft_chain_filter_bridge_fini(void) {}
287 #endif /* CONFIG_NF_TABLES_BRIDGE */
289 #ifdef CONFIG_NF_TABLES_NETDEV
290 static unsigned int nft_do_chain_netdev(void *priv, struct sk_buff *skb,
291 const struct nf_hook_state *state)
293 struct nft_pktinfo pkt;
295 nft_set_pktinfo(&pkt, skb, state);
297 switch (skb->protocol) {
298 case htons(ETH_P_IP):
299 nft_set_pktinfo_ipv4_validate(&pkt, skb);
301 case htons(ETH_P_IPV6):
302 nft_set_pktinfo_ipv6_validate(&pkt, skb);
305 nft_set_pktinfo_unspec(&pkt, skb);
309 return nft_do_chain(&pkt, priv);
312 static const struct nft_chain_type nft_chain_filter_netdev = {
314 .type = NFT_CHAIN_T_DEFAULT,
315 .family = NFPROTO_NETDEV,
316 .hook_mask = (1 << NF_NETDEV_INGRESS),
318 [NF_NETDEV_INGRESS] = nft_do_chain_netdev,
322 static void nft_netdev_event(unsigned long event, struct net_device *dev,
325 struct nft_base_chain *basechain = nft_base_chain(ctx->chain);
326 struct nft_hook *hook, *found = NULL;
329 if (event != NETDEV_UNREGISTER)
332 list_for_each_entry(hook, &basechain->hook_list, list) {
333 if (hook->ops.dev == dev)
342 nf_unregister_net_hook(ctx->net, &found->ops);
343 list_del_rcu(&found->list);
344 kfree_rcu(found, rcu);
348 /* UNREGISTER events are also happening on netns exit.
350 * Although nf_tables core releases all tables/chains, only this event
351 * handler provides guarantee that hook->ops.dev is still accessible,
352 * so we cannot skip exiting net namespaces.
354 __nft_release_basechain(ctx);
357 static int nf_tables_netdev_event(struct notifier_block *this,
358 unsigned long event, void *ptr)
360 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
361 struct nftables_pernet *nft_net;
362 struct nft_table *table;
363 struct nft_chain *chain, *nr;
364 struct nft_ctx ctx = {
368 if (event != NETDEV_UNREGISTER &&
369 event != NETDEV_CHANGENAME)
372 nft_net = net_generic(ctx.net, nf_tables_net_id);
373 mutex_lock(&nft_net->commit_mutex);
374 list_for_each_entry(table, &nft_net->tables, list) {
375 if (table->family != NFPROTO_NETDEV)
378 ctx.family = table->family;
380 list_for_each_entry_safe(chain, nr, &table->chains, list) {
381 if (!nft_is_base_chain(chain))
385 nft_netdev_event(event, dev, &ctx);
388 mutex_unlock(&nft_net->commit_mutex);
393 static struct notifier_block nf_tables_netdev_notifier = {
394 .notifier_call = nf_tables_netdev_event,
397 static int nft_chain_filter_netdev_init(void)
401 nft_register_chain_type(&nft_chain_filter_netdev);
403 err = register_netdevice_notifier(&nf_tables_netdev_notifier);
405 goto err_register_netdevice_notifier;
409 err_register_netdevice_notifier:
410 nft_unregister_chain_type(&nft_chain_filter_netdev);
415 static void nft_chain_filter_netdev_fini(void)
417 nft_unregister_chain_type(&nft_chain_filter_netdev);
418 unregister_netdevice_notifier(&nf_tables_netdev_notifier);
421 static inline int nft_chain_filter_netdev_init(void) { return 0; }
422 static inline void nft_chain_filter_netdev_fini(void) {}
423 #endif /* CONFIG_NF_TABLES_NETDEV */
425 int __init nft_chain_filter_init(void)
429 err = nft_chain_filter_netdev_init();
433 nft_chain_filter_ipv4_init();
434 nft_chain_filter_ipv6_init();
435 nft_chain_filter_arp_init();
436 nft_chain_filter_inet_init();
437 nft_chain_filter_bridge_init();
442 void nft_chain_filter_fini(void)
444 nft_chain_filter_bridge_fini();
445 nft_chain_filter_inet_fini();
446 nft_chain_filter_arp_fini();
447 nft_chain_filter_ipv6_fini();
448 nft_chain_filter_ipv4_fini();
449 nft_chain_filter_netdev_fini();