1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/module.h>
3 #include <linux/netfilter/nf_tables.h>
4 #include <net/netfilter/nf_tables.h>
5 #include <net/netfilter/nf_tables_core.h>
6 #include <net/netfilter/nf_socket.h>
7 #include <net/inet_sock.h>
11 enum nft_socket_keys key:8;
17 static void nft_socket_wildcard(const struct nft_pktinfo *pkt,
18 struct nft_regs *regs, struct sock *sk,
21 switch (nft_pf(pkt)) {
23 nft_reg_store8(dest, inet_sk(sk)->inet_rcv_saddr == 0);
25 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
27 nft_reg_store8(dest, ipv6_addr_any(&sk->sk_v6_rcv_saddr));
31 regs->verdict.code = NFT_BREAK;
36 static struct sock *nft_socket_do_lookup(const struct nft_pktinfo *pkt)
38 const struct net_device *indev = nft_in(pkt);
39 const struct sk_buff *skb = pkt->skb;
40 struct sock *sk = NULL;
45 switch (nft_pf(pkt)) {
47 sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, indev);
49 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
51 sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, indev);
62 static void nft_socket_eval(const struct nft_expr *expr,
63 struct nft_regs *regs,
64 const struct nft_pktinfo *pkt)
66 const struct nft_socket *priv = nft_expr_priv(expr);
67 struct sk_buff *skb = pkt->skb;
68 struct sock *sk = skb->sk;
69 u32 *dest = ®s->data[priv->dreg];
71 if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
75 sk = nft_socket_do_lookup(pkt);
78 regs->verdict.code = NFT_BREAK;
83 case NFT_SOCKET_TRANSPARENT:
84 nft_reg_store8(dest, inet_sk_transparent(sk));
87 if (sk_fullsock(sk)) {
90 regs->verdict.code = NFT_BREAK;
94 case NFT_SOCKET_WILDCARD:
95 if (!sk_fullsock(sk)) {
96 regs->verdict.code = NFT_BREAK;
99 nft_socket_wildcard(pkt, regs, sk, dest);
103 regs->verdict.code = NFT_BREAK;
110 static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
111 [NFTA_SOCKET_KEY] = { .type = NLA_U32 },
112 [NFTA_SOCKET_DREG] = { .type = NLA_U32 },
115 static int nft_socket_init(const struct nft_ctx *ctx,
116 const struct nft_expr *expr,
117 const struct nlattr * const tb[])
119 struct nft_socket *priv = nft_expr_priv(expr);
122 if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY])
125 switch(ctx->family) {
127 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
136 priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY]));
138 case NFT_SOCKET_TRANSPARENT:
139 case NFT_SOCKET_WILDCARD:
142 case NFT_SOCKET_MARK:
149 return nft_parse_register_store(ctx, tb[NFTA_SOCKET_DREG], &priv->dreg,
150 NULL, NFT_DATA_VALUE, len);
153 static int nft_socket_dump(struct sk_buff *skb,
154 const struct nft_expr *expr)
156 const struct nft_socket *priv = nft_expr_priv(expr);
158 if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key)))
160 if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg))
165 static int nft_socket_validate(const struct nft_ctx *ctx,
166 const struct nft_expr *expr,
167 const struct nft_data **data)
169 return nft_chain_validate_hooks(ctx->chain,
170 (1 << NF_INET_PRE_ROUTING) |
171 (1 << NF_INET_LOCAL_IN) |
172 (1 << NF_INET_LOCAL_OUT));
175 static struct nft_expr_type nft_socket_type;
176 static const struct nft_expr_ops nft_socket_ops = {
177 .type = &nft_socket_type,
178 .size = NFT_EXPR_SIZE(sizeof(struct nft_socket)),
179 .eval = nft_socket_eval,
180 .init = nft_socket_init,
181 .dump = nft_socket_dump,
182 .validate = nft_socket_validate,
185 static struct nft_expr_type nft_socket_type __read_mostly = {
187 .ops = &nft_socket_ops,
188 .policy = nft_socket_policy,
189 .maxattr = NFTA_SOCKET_MAX,
190 .owner = THIS_MODULE,
193 static int __init nft_socket_module_init(void)
195 return nft_register_expr(&nft_socket_type);
198 static void __exit nft_socket_module_exit(void)
200 nft_unregister_expr(&nft_socket_type);
203 module_init(nft_socket_module_init);
204 module_exit(nft_socket_module_exit);
206 MODULE_LICENSE("GPL");
207 MODULE_AUTHOR("Máté Eckl");
208 MODULE_DESCRIPTION("nf_tables socket match module");
209 MODULE_ALIAS_NFT_EXPR("socket");