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