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;
19 static void nft_socket_wildcard(const struct nft_pktinfo *pkt,
20 struct nft_regs *regs, struct sock *sk,
23 switch (nft_pf(pkt)) {
25 nft_reg_store8(dest, inet_sk(sk)->inet_rcv_saddr == 0);
27 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
29 nft_reg_store8(dest, ipv6_addr_any(&sk->sk_v6_rcv_saddr));
33 regs->verdict.code = NFT_BREAK;
38 #ifdef CONFIG_SOCK_CGROUP_DATA
40 nft_sock_get_eval_cgroupv2(u32 *dest, struct sock *sk, const struct nft_pktinfo *pkt, u32 level)
47 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
48 if (level > cgrp->level)
51 memcpy(dest, &cgrp->ancestor_ids[level], sizeof(u64));
57 static struct sock *nft_socket_do_lookup(const struct nft_pktinfo *pkt)
59 const struct net_device *indev = nft_in(pkt);
60 const struct sk_buff *skb = pkt->skb;
61 struct sock *sk = NULL;
66 switch (nft_pf(pkt)) {
68 sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, indev);
70 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
72 sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, indev);
83 static void nft_socket_eval(const struct nft_expr *expr,
84 struct nft_regs *regs,
85 const struct nft_pktinfo *pkt)
87 const struct nft_socket *priv = nft_expr_priv(expr);
88 struct sk_buff *skb = pkt->skb;
89 struct sock *sk = skb->sk;
90 u32 *dest = ®s->data[priv->dreg];
92 if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
96 sk = nft_socket_do_lookup(pkt);
99 regs->verdict.code = NFT_BREAK;
104 case NFT_SOCKET_TRANSPARENT:
105 nft_reg_store8(dest, inet_sk_transparent(sk));
107 case NFT_SOCKET_MARK:
108 if (sk_fullsock(sk)) {
111 regs->verdict.code = NFT_BREAK;
115 case NFT_SOCKET_WILDCARD:
116 if (!sk_fullsock(sk)) {
117 regs->verdict.code = NFT_BREAK;
120 nft_socket_wildcard(pkt, regs, sk, dest);
122 #ifdef CONFIG_SOCK_CGROUP_DATA
123 case NFT_SOCKET_CGROUPV2:
124 if (!nft_sock_get_eval_cgroupv2(dest, sk, pkt, priv->level)) {
125 regs->verdict.code = NFT_BREAK;
132 regs->verdict.code = NFT_BREAK;
139 static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
140 [NFTA_SOCKET_KEY] = { .type = NLA_U32 },
141 [NFTA_SOCKET_DREG] = { .type = NLA_U32 },
142 [NFTA_SOCKET_LEVEL] = { .type = NLA_U32 },
145 static int nft_socket_init(const struct nft_ctx *ctx,
146 const struct nft_expr *expr,
147 const struct nlattr * const tb[])
149 struct nft_socket *priv = nft_expr_priv(expr);
152 if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY])
155 switch(ctx->family) {
157 #if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
166 priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY]));
168 case NFT_SOCKET_TRANSPARENT:
169 case NFT_SOCKET_WILDCARD:
172 case NFT_SOCKET_MARK:
175 #ifdef CONFIG_CGROUPS
176 case NFT_SOCKET_CGROUPV2: {
179 if (!tb[NFTA_SOCKET_LEVEL])
182 level = ntohl(nla_get_u32(tb[NFTA_SOCKET_LEVEL]));
196 return nft_parse_register_store(ctx, tb[NFTA_SOCKET_DREG], &priv->dreg,
197 NULL, NFT_DATA_VALUE, len);
200 static int nft_socket_dump(struct sk_buff *skb,
201 const struct nft_expr *expr)
203 const struct nft_socket *priv = nft_expr_priv(expr);
205 if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key)))
207 if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg))
209 if (priv->key == NFT_SOCKET_CGROUPV2 &&
210 nla_put_u32(skb, NFTA_SOCKET_LEVEL, htonl(priv->level)))
215 static bool nft_socket_reduce(struct nft_regs_track *track,
216 const struct nft_expr *expr)
218 const struct nft_socket *priv = nft_expr_priv(expr);
219 const struct nft_socket *socket;
221 if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
222 nft_reg_track_update(track, expr, priv->dreg, priv->len);
226 socket = nft_expr_priv(track->regs[priv->dreg].selector);
227 if (priv->key != socket->key ||
228 priv->dreg != socket->dreg ||
229 priv->level != socket->level) {
230 nft_reg_track_update(track, expr, priv->dreg, priv->len);
234 if (!track->regs[priv->dreg].bitwise)
237 return nft_expr_reduce_bitwise(track, expr);
240 static int nft_socket_validate(const struct nft_ctx *ctx,
241 const struct nft_expr *expr,
242 const struct nft_data **data)
244 return nft_chain_validate_hooks(ctx->chain,
245 (1 << NF_INET_PRE_ROUTING) |
246 (1 << NF_INET_LOCAL_IN) |
247 (1 << NF_INET_LOCAL_OUT));
250 static struct nft_expr_type nft_socket_type;
251 static const struct nft_expr_ops nft_socket_ops = {
252 .type = &nft_socket_type,
253 .size = NFT_EXPR_SIZE(sizeof(struct nft_socket)),
254 .eval = nft_socket_eval,
255 .init = nft_socket_init,
256 .dump = nft_socket_dump,
257 .validate = nft_socket_validate,
258 .reduce = nft_socket_reduce,
261 static struct nft_expr_type nft_socket_type __read_mostly = {
263 .ops = &nft_socket_ops,
264 .policy = nft_socket_policy,
265 .maxattr = NFTA_SOCKET_MAX,
266 .owner = THIS_MODULE,
269 static int __init nft_socket_module_init(void)
271 return nft_register_expr(&nft_socket_type);
274 static void __exit nft_socket_module_exit(void)
276 nft_unregister_expr(&nft_socket_type);
279 module_init(nft_socket_module_init);
280 module_exit(nft_socket_module_exit);
282 MODULE_LICENSE("GPL");
283 MODULE_AUTHOR("Máté Eckl");
284 MODULE_DESCRIPTION("nf_tables socket match module");
285 MODULE_ALIAS_NFT_EXPR("socket");