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#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <net/net_namespace.h>
#include <net/netfilter/nf_tables.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter_bridge.h>
#include <linux/netfilter_arp.h>
#include <net/netfilter/nf_tables_ipv4.h>
#include <net/netfilter/nf_tables_ipv6.h>
#ifdef CONFIG_NF_TABLES_IPV4
static unsigned int nft_do_chain_ipv4(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, skb, state);
nft_set_pktinfo_ipv4(&pkt, skb);
return nft_do_chain(&pkt, priv);
}
static const struct nft_chain_type nft_chain_filter_ipv4 = {
.name = "filter",
.type = NFT_CHAIN_T_DEFAULT,
.family = NFPROTO_IPV4,
.hook_mask = (1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_FORWARD) |
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING),
.hooks = {
[NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
[NF_INET_LOCAL_OUT] = nft_do_chain_ipv4,
[NF_INET_FORWARD] = nft_do_chain_ipv4,
[NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
[NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
},
};
static void nft_chain_filter_ipv4_init(void)
{
nft_register_chain_type(&nft_chain_filter_ipv4);
}
static void nft_chain_filter_ipv4_fini(void)
{
nft_unregister_chain_type(&nft_chain_filter_ipv4);
}
#else
static inline void nft_chain_filter_ipv4_init(void) {}
static inline void nft_chain_filter_ipv4_fini(void) {}
#endif /* CONFIG_NF_TABLES_IPV4 */
#ifdef CONFIG_NF_TABLES_ARP
static unsigned int nft_do_chain_arp(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, skb, state);
nft_set_pktinfo_unspec(&pkt, skb);
return nft_do_chain(&pkt, priv);
}
static const struct nft_chain_type nft_chain_filter_arp = {
.name = "filter",
.type = NFT_CHAIN_T_DEFAULT,
.family = NFPROTO_ARP,
.owner = THIS_MODULE,
.hook_mask = (1 << NF_ARP_IN) |
(1 << NF_ARP_OUT),
.hooks = {
[NF_ARP_IN] = nft_do_chain_arp,
[NF_ARP_OUT] = nft_do_chain_arp,
},
};
static void nft_chain_filter_arp_init(void)
{
nft_register_chain_type(&nft_chain_filter_arp);
}
static void nft_chain_filter_arp_fini(void)
{
nft_unregister_chain_type(&nft_chain_filter_arp);
}
#else
static inline void nft_chain_filter_arp_init(void) {}
static inline void nft_chain_filter_arp_fini(void) {}
#endif /* CONFIG_NF_TABLES_ARP */
#ifdef CONFIG_NF_TABLES_IPV6
static unsigned int nft_do_chain_ipv6(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, skb, state);
nft_set_pktinfo_ipv6(&pkt, skb);
return nft_do_chain(&pkt, priv);
}
static const struct nft_chain_type nft_chain_filter_ipv6 = {
.name = "filter",
.type = NFT_CHAIN_T_DEFAULT,
.family = NFPROTO_IPV6,
.hook_mask = (1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_FORWARD) |
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING),
.hooks = {
[NF_INET_LOCAL_IN] = nft_do_chain_ipv6,
[NF_INET_LOCAL_OUT] = nft_do_chain_ipv6,
[NF_INET_FORWARD] = nft_do_chain_ipv6,
[NF_INET_PRE_ROUTING] = nft_do_chain_ipv6,
[NF_INET_POST_ROUTING] = nft_do_chain_ipv6,
},
};
static void nft_chain_filter_ipv6_init(void)
{
nft_register_chain_type(&nft_chain_filter_ipv6);
}
static void nft_chain_filter_ipv6_fini(void)
{
nft_unregister_chain_type(&nft_chain_filter_ipv6);
}
#else
static inline void nft_chain_filter_ipv6_init(void) {}
static inline void nft_chain_filter_ipv6_fini(void) {}
#endif /* CONFIG_NF_TABLES_IPV6 */
#ifdef CONFIG_NF_TABLES_INET
static unsigned int nft_do_chain_inet(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, skb, state);
switch (state->pf) {
case NFPROTO_IPV4:
nft_set_pktinfo_ipv4(&pkt, skb);
break;
case NFPROTO_IPV6:
nft_set_pktinfo_ipv6(&pkt, skb);
break;
default:
break;
}
return nft_do_chain(&pkt, priv);
}
static const struct nft_chain_type nft_chain_filter_inet = {
.name = "filter",
.type = NFT_CHAIN_T_DEFAULT,
.family = NFPROTO_INET,
.hook_mask = (1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_FORWARD) |
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING),
.hooks = {
[NF_INET_LOCAL_IN] = nft_do_chain_inet,
[NF_INET_LOCAL_OUT] = nft_do_chain_inet,
[NF_INET_FORWARD] = nft_do_chain_inet,
[NF_INET_PRE_ROUTING] = nft_do_chain_inet,
[NF_INET_POST_ROUTING] = nft_do_chain_inet,
},
};
static void nft_chain_filter_inet_init(void)
{
nft_register_chain_type(&nft_chain_filter_inet);
}
static void nft_chain_filter_inet_fini(void)
{
nft_unregister_chain_type(&nft_chain_filter_inet);
}
#else
static inline void nft_chain_filter_inet_init(void) {}
static inline void nft_chain_filter_inet_fini(void) {}
#endif /* CONFIG_NF_TABLES_IPV6 */
#ifdef CONFIG_NF_TABLES_BRIDGE
static unsigned int
nft_do_chain_bridge(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, skb, state);
switch (eth_hdr(skb)->h_proto) {
case htons(ETH_P_IP):
nft_set_pktinfo_ipv4_validate(&pkt, skb);
break;
case htons(ETH_P_IPV6):
nft_set_pktinfo_ipv6_validate(&pkt, skb);
break;
default:
nft_set_pktinfo_unspec(&pkt, skb);
break;
}
return nft_do_chain(&pkt, priv);
}
static const struct nft_chain_type nft_chain_filter_bridge = {
.name = "filter",
.type = NFT_CHAIN_T_DEFAULT,
.family = NFPROTO_BRIDGE,
.hook_mask = (1 << NF_BR_PRE_ROUTING) |
(1 << NF_BR_LOCAL_IN) |
(1 << NF_BR_FORWARD) |
(1 << NF_BR_LOCAL_OUT) |
(1 << NF_BR_POST_ROUTING),
.hooks = {
[NF_BR_PRE_ROUTING] = nft_do_chain_bridge,
[NF_BR_LOCAL_IN] = nft_do_chain_bridge,
[NF_BR_FORWARD] = nft_do_chain_bridge,
[NF_BR_LOCAL_OUT] = nft_do_chain_bridge,
[NF_BR_POST_ROUTING] = nft_do_chain_bridge,
},
};
static void nft_chain_filter_bridge_init(void)
{
nft_register_chain_type(&nft_chain_filter_bridge);
}
static void nft_chain_filter_bridge_fini(void)
{
nft_unregister_chain_type(&nft_chain_filter_bridge);
}
#else
static inline void nft_chain_filter_bridge_init(void) {}
static inline void nft_chain_filter_bridge_fini(void) {}
#endif /* CONFIG_NF_TABLES_BRIDGE */
#ifdef CONFIG_NF_TABLES_NETDEV
static unsigned int nft_do_chain_netdev(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nft_pktinfo pkt;
nft_set_pktinfo(&pkt, skb, state);
switch (skb->protocol) {
case htons(ETH_P_IP):
nft_set_pktinfo_ipv4_validate(&pkt, skb);
break;
case htons(ETH_P_IPV6):
|