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;
13 enum nft_registers dreg:8;
17 static struct sock *nft_socket_do_lookup(const struct nft_pktinfo *pkt)
19 const struct net_device *indev = nft_in(pkt);
20 const struct sk_buff *skb = pkt->skb;
21 struct sock *sk = NULL;
26 switch (nft_pf(pkt)) {
28 sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, indev);
30 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
32 sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, indev);
43 static void nft_socket_eval(const struct nft_expr *expr,
44 struct nft_regs *regs,
45 const struct nft_pktinfo *pkt)
47 const struct nft_socket *priv = nft_expr_priv(expr);
48 struct sk_buff *skb = pkt->skb;
49 struct sock *sk = skb->sk;
50 u32 *dest = ®s->data[priv->dreg];
52 if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
56 sk = nft_socket_do_lookup(pkt);
59 regs->verdict.code = NFT_BREAK;
64 case NFT_SOCKET_TRANSPARENT:
65 nft_reg_store8(dest, inet_sk_transparent(sk));
68 if (sk_fullsock(sk)) {
71 regs->verdict.code = NFT_BREAK;
77 regs->verdict.code = NFT_BREAK;
84 static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
85 [NFTA_SOCKET_KEY] = { .type = NLA_U32 },
86 [NFTA_SOCKET_DREG] = { .type = NLA_U32 },
89 static int nft_socket_init(const struct nft_ctx *ctx,
90 const struct nft_expr *expr,
91 const struct nlattr * const tb[])
93 struct nft_socket *priv = nft_expr_priv(expr);
96 if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY])
101 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
110 priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY]));
112 case NFT_SOCKET_TRANSPARENT:
115 case NFT_SOCKET_MARK:
122 priv->dreg = nft_parse_register(tb[NFTA_SOCKET_DREG]);
123 return nft_validate_register_store(ctx, priv->dreg, NULL,
124 NFT_DATA_VALUE, len);
127 static int nft_socket_dump(struct sk_buff *skb,
128 const struct nft_expr *expr)
130 const struct nft_socket *priv = nft_expr_priv(expr);
132 if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key)))
134 if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg))
139 static int nft_socket_validate(const struct nft_ctx *ctx,
140 const struct nft_expr *expr,
141 const struct nft_data **data)
143 return nft_chain_validate_hooks(ctx->chain,
144 (1 << NF_INET_PRE_ROUTING) |
145 (1 << NF_INET_LOCAL_IN) |
146 (1 << NF_INET_LOCAL_OUT));
149 static struct nft_expr_type nft_socket_type;
150 static const struct nft_expr_ops nft_socket_ops = {
151 .type = &nft_socket_type,
152 .size = NFT_EXPR_SIZE(sizeof(struct nft_socket)),
153 .eval = nft_socket_eval,
154 .init = nft_socket_init,
155 .dump = nft_socket_dump,
156 .validate = nft_socket_validate,
159 static struct nft_expr_type nft_socket_type __read_mostly = {
161 .ops = &nft_socket_ops,
162 .policy = nft_socket_policy,
163 .maxattr = NFTA_SOCKET_MAX,
164 .owner = THIS_MODULE,
167 static int __init nft_socket_module_init(void)
169 return nft_register_expr(&nft_socket_type);
172 static void __exit nft_socket_module_exit(void)
174 nft_unregister_expr(&nft_socket_type);
177 module_init(nft_socket_module_init);
178 module_exit(nft_socket_module_exit);
180 MODULE_LICENSE("GPL");
181 MODULE_AUTHOR("Máté Eckl");
182 MODULE_DESCRIPTION("nf_tables socket match module");
183 MODULE_ALIAS_NFT_EXPR("socket");