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 void nft_socket_eval(const struct nft_expr *expr,
18 struct nft_regs *regs,
19 const struct nft_pktinfo *pkt)
21 const struct nft_socket *priv = nft_expr_priv(expr);
22 struct sk_buff *skb = pkt->skb;
23 struct sock *sk = skb->sk;
24 u32 *dest = ®s->data[priv->dreg];
26 if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
32 sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, nft_in(pkt));
34 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
36 sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, nft_in(pkt));
41 regs->verdict.code = NFT_BREAK;
46 regs->verdict.code = NFT_BREAK;
51 case NFT_SOCKET_TRANSPARENT:
52 nft_reg_store8(dest, inet_sk_transparent(sk));
55 if (sk_fullsock(sk)) {
58 regs->verdict.code = NFT_BREAK;
64 regs->verdict.code = NFT_BREAK;
71 static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
72 [NFTA_SOCKET_KEY] = { .type = NLA_U32 },
73 [NFTA_SOCKET_DREG] = { .type = NLA_U32 },
76 static int nft_socket_init(const struct nft_ctx *ctx,
77 const struct nft_expr *expr,
78 const struct nlattr * const tb[])
80 struct nft_socket *priv = nft_expr_priv(expr);
83 if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY])
88 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
97 priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY]));
99 case NFT_SOCKET_TRANSPARENT:
102 case NFT_SOCKET_MARK:
109 priv->dreg = nft_parse_register(tb[NFTA_SOCKET_DREG]);
110 return nft_validate_register_store(ctx, priv->dreg, NULL,
111 NFT_DATA_VALUE, len);
114 static int nft_socket_dump(struct sk_buff *skb,
115 const struct nft_expr *expr)
117 const struct nft_socket *priv = nft_expr_priv(expr);
119 if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key)))
121 if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg))
126 static struct nft_expr_type nft_socket_type;
127 static const struct nft_expr_ops nft_socket_ops = {
128 .type = &nft_socket_type,
129 .size = NFT_EXPR_SIZE(sizeof(struct nft_socket)),
130 .eval = nft_socket_eval,
131 .init = nft_socket_init,
132 .dump = nft_socket_dump,
135 static struct nft_expr_type nft_socket_type __read_mostly = {
137 .ops = &nft_socket_ops,
138 .policy = nft_socket_policy,
139 .maxattr = NFTA_SOCKET_MAX,
140 .owner = THIS_MODULE,
143 static int __init nft_socket_module_init(void)
145 return nft_register_expr(&nft_socket_type);
148 static void __exit nft_socket_module_exit(void)
150 nft_unregister_expr(&nft_socket_type);
153 module_init(nft_socket_module_init);
154 module_exit(nft_socket_module_exit);
156 MODULE_LICENSE("GPL");
157 MODULE_AUTHOR("Máté Eckl");
158 MODULE_DESCRIPTION("nf_tables socket match module");
159 MODULE_ALIAS_NFT_EXPR("socket");