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;
18 static void nft_socket_wildcard(const struct nft_pktinfo *pkt,
19 struct nft_regs *regs, struct sock *sk,
22 switch (nft_pf(pkt)) {
24 nft_reg_store8(dest, inet_sk(sk)->inet_rcv_saddr == 0);
26 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
28 nft_reg_store8(dest, ipv6_addr_any(&sk->sk_v6_rcv_saddr));
32 regs->verdict.code = NFT_BREAK;
37 #ifdef CONFIG_SOCK_CGROUP_DATA
39 nft_sock_get_eval_cgroupv2(u32 *dest, struct sock *sk, const struct nft_pktinfo *pkt, u32 level)
46 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
47 if (level > cgrp->level)
50 memcpy(dest, &cgrp->ancestor_ids[level], sizeof(u64));
56 static struct sock *nft_socket_do_lookup(const struct nft_pktinfo *pkt)
58 const struct net_device *indev = nft_in(pkt);
59 const struct sk_buff *skb = pkt->skb;
60 struct sock *sk = NULL;
65 switch (nft_pf(pkt)) {
67 sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, indev);
69 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
71 sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, indev);
82 static void nft_socket_eval(const struct nft_expr *expr,
83 struct nft_regs *regs,
84 const struct nft_pktinfo *pkt)
86 const struct nft_socket *priv = nft_expr_priv(expr);
87 struct sk_buff *skb = pkt->skb;
88 struct sock *sk = skb->sk;
89 u32 *dest = ®s->data[priv->dreg];
91 if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
95 sk = nft_socket_do_lookup(pkt);
98 regs->verdict.code = NFT_BREAK;
103 case NFT_SOCKET_TRANSPARENT:
104 nft_reg_store8(dest, inet_sk_transparent(sk));
106 case NFT_SOCKET_MARK:
107 if (sk_fullsock(sk)) {
110 regs->verdict.code = NFT_BREAK;
114 case NFT_SOCKET_WILDCARD:
115 if (!sk_fullsock(sk)) {
116 regs->verdict.code = NFT_BREAK;
119 nft_socket_wildcard(pkt, regs, sk, dest);
121 #ifdef CONFIG_SOCK_CGROUP_DATA
122 case NFT_SOCKET_CGROUPV2:
123 if (!nft_sock_get_eval_cgroupv2(dest, sk, pkt, priv->level)) {
124 regs->verdict.code = NFT_BREAK;
131 regs->verdict.code = NFT_BREAK;
138 static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
139 [NFTA_SOCKET_KEY] = { .type = NLA_U32 },
140 [NFTA_SOCKET_DREG] = { .type = NLA_U32 },
141 [NFTA_SOCKET_LEVEL] = { .type = NLA_U32 },
144 static int nft_socket_init(const struct nft_ctx *ctx,
145 const struct nft_expr *expr,
146 const struct nlattr * const tb[])
148 struct nft_socket *priv = nft_expr_priv(expr);
151 if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY])
154 switch(ctx->family) {
156 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
165 priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY]));
167 case NFT_SOCKET_TRANSPARENT:
168 case NFT_SOCKET_WILDCARD:
171 case NFT_SOCKET_MARK:
174 #ifdef CONFIG_CGROUPS
175 case NFT_SOCKET_CGROUPV2: {
178 if (!tb[NFTA_SOCKET_LEVEL])
181 level = ntohl(nla_get_u32(tb[NFTA_SOCKET_LEVEL]));
194 return nft_parse_register_store(ctx, tb[NFTA_SOCKET_DREG], &priv->dreg,
195 NULL, NFT_DATA_VALUE, len);
198 static int nft_socket_dump(struct sk_buff *skb,
199 const struct nft_expr *expr)
201 const struct nft_socket *priv = nft_expr_priv(expr);
203 if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key)))
205 if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg))
207 if (priv->key == NFT_SOCKET_CGROUPV2 &&
208 nla_put_u32(skb, NFTA_SOCKET_LEVEL, htonl(priv->level)))
213 static int nft_socket_validate(const struct nft_ctx *ctx,
214 const struct nft_expr *expr,
215 const struct nft_data **data)
217 return nft_chain_validate_hooks(ctx->chain,
218 (1 << NF_INET_PRE_ROUTING) |
219 (1 << NF_INET_LOCAL_IN) |
220 (1 << NF_INET_LOCAL_OUT));
223 static struct nft_expr_type nft_socket_type;
224 static const struct nft_expr_ops nft_socket_ops = {
225 .type = &nft_socket_type,
226 .size = NFT_EXPR_SIZE(sizeof(struct nft_socket)),
227 .eval = nft_socket_eval,
228 .init = nft_socket_init,
229 .dump = nft_socket_dump,
230 .validate = nft_socket_validate,
233 static struct nft_expr_type nft_socket_type __read_mostly = {
235 .ops = &nft_socket_ops,
236 .policy = nft_socket_policy,
237 .maxattr = NFTA_SOCKET_MAX,
238 .owner = THIS_MODULE,
241 static int __init nft_socket_module_init(void)
243 return nft_register_expr(&nft_socket_type);
246 static void __exit nft_socket_module_exit(void)
248 nft_unregister_expr(&nft_socket_type);
251 module_init(nft_socket_module_init);
252 module_exit(nft_socket_module_exit);
254 MODULE_LICENSE("GPL");
255 MODULE_AUTHOR("Máté Eckl");
256 MODULE_DESCRIPTION("nf_tables socket match module");
257 MODULE_ALIAS_NFT_EXPR("socket");