/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/module.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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#include <net/netfilter/nf_socket.h>
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#include <net/inet_sock.h>
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#include <net/tcp.h>
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struct nft_socket {
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enum nft_socket_keys key:8;
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union {
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u8 dreg;
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};
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};
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static void nft_socket_wildcard(const struct nft_pktinfo *pkt,
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struct nft_regs *regs, struct sock *sk,
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u32 *dest)
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{
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switch (nft_pf(pkt)) {
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case NFPROTO_IPV4:
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nft_reg_store8(dest, inet_sk(sk)->inet_rcv_saddr == 0);
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break;
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#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
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case NFPROTO_IPV6:
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nft_reg_store8(dest, ipv6_addr_any(&sk->sk_v6_rcv_saddr));
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break;
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#endif
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default:
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regs->verdict.code = NFT_BREAK;
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return;
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}
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}
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static struct sock *nft_socket_do_lookup(const struct nft_pktinfo *pkt)
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{
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const struct net_device *indev = nft_in(pkt);
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const struct sk_buff *skb = pkt->skb;
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struct sock *sk = NULL;
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if (!indev)
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return NULL;
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switch (nft_pf(pkt)) {
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case NFPROTO_IPV4:
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sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, indev);
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break;
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#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
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case NFPROTO_IPV6:
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sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, indev);
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break;
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#endif
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default:
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WARN_ON_ONCE(1);
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break;
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}
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return sk;
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}
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static void nft_socket_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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const struct nft_socket *priv = nft_expr_priv(expr);
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struct sk_buff *skb = pkt->skb;
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struct sock *sk = skb->sk;
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u32 *dest = ®s->data[priv->dreg];
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if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
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sk = NULL;
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if (!sk)
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sk = nft_socket_do_lookup(pkt);
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if (!sk) {
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regs->verdict.code = NFT_BREAK;
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return;
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}
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switch(priv->key) {
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case NFT_SOCKET_TRANSPARENT:
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nft_reg_store8(dest, inet_sk_transparent(sk));
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break;
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case NFT_SOCKET_MARK:
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if (sk_fullsock(sk)) {
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*dest = sk->sk_mark;
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} else {
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regs->verdict.code = NFT_BREAK;
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return;
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}
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break;
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case NFT_SOCKET_WILDCARD:
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if (!sk_fullsock(sk)) {
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regs->verdict.code = NFT_BREAK;
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return;
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}
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nft_socket_wildcard(pkt, regs, sk, dest);
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break;
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default:
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WARN_ON(1);
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regs->verdict.code = NFT_BREAK;
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}
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if (sk != skb->sk)
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sock_gen_put(sk);
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}
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static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
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[NFTA_SOCKET_KEY] = { .type = NLA_U32 },
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[NFTA_SOCKET_DREG] = { .type = NLA_U32 },
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};
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static int nft_socket_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_socket *priv = nft_expr_priv(expr);
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unsigned int len;
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if (!tb[NFTA_SOCKET_DREG] || !tb[NFTA_SOCKET_KEY])
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return -EINVAL;
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switch(ctx->family) {
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case NFPROTO_IPV4:
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#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
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case NFPROTO_IPV6:
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#endif
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case NFPROTO_INET:
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break;
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default:
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return -EOPNOTSUPP;
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}
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priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY]));
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switch(priv->key) {
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case NFT_SOCKET_TRANSPARENT:
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case NFT_SOCKET_WILDCARD:
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len = sizeof(u8);
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break;
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case NFT_SOCKET_MARK:
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len = sizeof(u32);
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break;
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default:
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return -EOPNOTSUPP;
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}
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return nft_parse_register_store(ctx, tb[NFTA_SOCKET_DREG], &priv->dreg,
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NULL, NFT_DATA_VALUE, len);
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}
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static int nft_socket_dump(struct sk_buff *skb,
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const struct nft_expr *expr)
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{
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const struct nft_socket *priv = nft_expr_priv(expr);
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if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key)))
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return -1;
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if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg))
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return -1;
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return 0;
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}
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static int nft_socket_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **data)
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{
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return nft_chain_validate_hooks(ctx->chain,
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(1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_LOCAL_OUT));
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}
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static struct nft_expr_type nft_socket_type;
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static const struct nft_expr_ops nft_socket_ops = {
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.type = &nft_socket_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_socket)),
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.eval = nft_socket_eval,
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.init = nft_socket_init,
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.dump = nft_socket_dump,
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.validate = nft_socket_validate,
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};
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static struct nft_expr_type nft_socket_type __read_mostly = {
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.name = "socket",
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.ops = &nft_socket_ops,
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.policy = nft_socket_policy,
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.maxattr = NFTA_SOCKET_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_socket_module_init(void)
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{
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return nft_register_expr(&nft_socket_type);
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}
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static void __exit nft_socket_module_exit(void)
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{
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nft_unregister_expr(&nft_socket_type);
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}
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module_init(nft_socket_module_init);
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module_exit(nft_socket_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Máté Eckl");
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MODULE_DESCRIPTION("nf_tables socket match module");
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MODULE_ALIAS_NFT_EXPR("socket");
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