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 void nft_socket_eval(const struct nft_expr *expr,
37 struct nft_regs *regs,
38 const struct nft_pktinfo *pkt)
40 const struct nft_socket *priv = nft_expr_priv(expr);
41 struct sk_buff *skb = pkt->skb;
42 struct sock *sk = skb->sk;
43 u32 *dest = ®s->data[priv->dreg];
45 if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
51 sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, nft_in(pkt));
53 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
55 sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, nft_in(pkt));
60 regs->verdict.code = NFT_BREAK;
65 regs->verdict.code = NFT_BREAK;
70 case NFT_SOCKET_TRANSPARENT:
71 nft_reg_store8(dest, inet_sk_transparent(sk));
74 if (sk_fullsock(sk)) {
77 regs->verdict.code = NFT_BREAK;
81 case NFT_SOCKET_WILDCARD:
82 if (!sk_fullsock(sk)) {
83 regs->verdict.code = NFT_BREAK;
86 nft_socket_wildcard(pkt, regs, sk, dest);
90 regs->verdict.code = NFT_BREAK;
97 static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
98 [NFTA_SOCKET_KEY] = { .type = NLA_U32 },
99 [NFTA_SOCKET_DREG] = { .type = NLA_U32 },
102 static int nft_socket_init(const struct nft_ctx *ctx,
103 const struct nft_expr *expr,
104 const struct nlattr * const tb[])
106 struct nft_socket *priv = nft_expr_priv(expr);
109 if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY])
112 switch(ctx->family) {
114 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
123 priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY]));
125 case NFT_SOCKET_TRANSPARENT:
126 case NFT_SOCKET_WILDCARD:
129 case NFT_SOCKET_MARK:
136 return nft_parse_register_store(ctx, tb[NFTA_SOCKET_DREG], &priv->dreg,
137 NULL, NFT_DATA_VALUE, len);
140 static int nft_socket_dump(struct sk_buff *skb,
141 const struct nft_expr *expr)
143 const struct nft_socket *priv = nft_expr_priv(expr);
145 if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key)))
147 if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg))
152 static struct nft_expr_type nft_socket_type;
153 static const struct nft_expr_ops nft_socket_ops = {
154 .type = &nft_socket_type,
155 .size = NFT_EXPR_SIZE(sizeof(struct nft_socket)),
156 .eval = nft_socket_eval,
157 .init = nft_socket_init,
158 .dump = nft_socket_dump,
161 static struct nft_expr_type nft_socket_type __read_mostly = {
163 .ops = &nft_socket_ops,
164 .policy = nft_socket_policy,
165 .maxattr = NFTA_SOCKET_MAX,
166 .owner = THIS_MODULE,
169 static int __init nft_socket_module_init(void)
171 return nft_register_expr(&nft_socket_type);
174 static void __exit nft_socket_module_exit(void)
176 nft_unregister_expr(&nft_socket_type);
179 module_init(nft_socket_module_init);
180 module_exit(nft_socket_module_exit);
182 MODULE_LICENSE("GPL");
183 MODULE_AUTHOR("Máté Eckl");
184 MODULE_DESCRIPTION("nf_tables socket match module");
185 MODULE_ALIAS_NFT_EXPR("socket");