[linux-2.6-block.git] / net / netfilter / nft_socket.c

/* 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");
Commit	Line	Data
554ced0a ME	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>
8d6e5557	8	#include <net/tcp.h>
554ced0a ME	9
	10	struct nft_socket {
	11	enum nft_socket_keys key:8;
	12	union {
	13	enum nft_registers dreg:8;
	14	};
	15	};
	16
	17	static void nft_socket_eval(const struct nft_expr *expr,
	18	struct nft_regs *regs,
	19	const struct nft_pktinfo *pkt)
	20	{
	21	const struct nft_socket *priv = nft_expr_priv(expr);
	22	struct sk_buff *skb = pkt->skb;
	23	struct sock *sk = skb->sk;
	24	u32 *dest = &regs->data[priv->dreg];
	25
f5646501 FL	26	if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
	27	sk = NULL;
	28
554ced0a ME	29	if (!sk)
	30	switch(nft_pf(pkt)) {
	31	case NFPROTO_IPV4:
	32	sk = nf_sk_lookup_slow_v4(nft_net(pkt), skb, nft_in(pkt));
	33	break;
5d400a49	34	#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
554ced0a ME	35	case NFPROTO_IPV6:
	36	sk = nf_sk_lookup_slow_v6(nft_net(pkt), skb, nft_in(pkt));
	37	break;
	38	#endif
	39	default:
	40	WARN_ON_ONCE(1);
	41	regs->verdict.code = NFT_BREAK;
	42	return;
	43	}
	44
f5646501	45	if (!sk) {
365b5a36	46	regs->verdict.code = NFT_BREAK;
554ced0a ME	47	return;
	48	}
	49
554ced0a ME	50	switch(priv->key) {
554ced0a ME	51	case NFT_SOCKET_TRANSPARENT:
8d6e5557	52	nft_reg_store8(dest, inet_sk_transparent(sk));
554ced0a	53	break;
7d25f885 ME	54	case NFT_SOCKET_MARK:
	55	if (sk_fullsock(sk)) {
	56	*dest = sk->sk_mark;
	57	} else {
	58	regs->verdict.code = NFT_BREAK;
	59	return;
	60	}
	61	break;
554ced0a ME	62	default:
	63	WARN_ON(1);
	64	regs->verdict.code = NFT_BREAK;
	65	}
039b1f4f FFM	66
	67	if (sk != skb->sk)
	68	sock_gen_put(sk);
554ced0a ME	69	}
	70
	71	static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
	72	[NFTA_SOCKET_KEY] = { .type = NLA_U32 },
	73	[NFTA_SOCKET_DREG] = { .type = NLA_U32 },
	74	};
	75
	76	static int nft_socket_init(const struct nft_ctx *ctx,
	77	const struct nft_expr *expr,
	78	const struct nlattr * const tb[])
	79	{
	80	struct nft_socket *priv = nft_expr_priv(expr);
	81	unsigned int len;
	82
	83	if (!tb[NFTA_SOCKET_DREG] \|\| !tb[NFTA_SOCKET_KEY])
	84	return -EINVAL;
	85
	86	switch(ctx->family) {
	87	case NFPROTO_IPV4:
5d400a49	88	#if IS_ENABLED(CONFIG_NF_TABLES_IPV6)
554ced0a ME	89	case NFPROTO_IPV6:
	90	#endif
	91	case NFPROTO_INET:
	92	break;
	93	default:
	94	return -EOPNOTSUPP;
	95	}
	96
	97	priv->key = ntohl(nla_get_u32(tb[NFTA_SOCKET_KEY]));
	98	switch(priv->key) {
	99	case NFT_SOCKET_TRANSPARENT:
	100	len = sizeof(u8);
	101	break;
7d25f885 ME	102	case NFT_SOCKET_MARK:
	103	len = sizeof(u32);
	104	break;
554ced0a ME	105	default:
	106	return -EOPNOTSUPP;
	107	}
	108
	109	priv->dreg = nft_parse_register(tb[NFTA_SOCKET_DREG]);
	110	return nft_validate_register_store(ctx, priv->dreg, NULL,
	111	NFT_DATA_VALUE, len);
	112	}
	113
	114	static int nft_socket_dump(struct sk_buff *skb,
	115	const struct nft_expr *expr)
	116	{
	117	const struct nft_socket *priv = nft_expr_priv(expr);
	118
	119	if (nla_put_u32(skb, NFTA_SOCKET_KEY, htonl(priv->key)))
	120	return -1;
	121	if (nft_dump_register(skb, NFTA_SOCKET_DREG, priv->dreg))
	122	return -1;
	123	return 0;
	124	}
	125
	126	static struct nft_expr_type nft_socket_type;
	127	static const struct nft_expr_ops nft_socket_ops = {
	128	.type = &nft_socket_type,
	129	.size = NFT_EXPR_SIZE(sizeof(struct nft_socket)),
	130	.eval = nft_socket_eval,
	131	.init = nft_socket_init,
	132	.dump = nft_socket_dump,
	133	};
	134
	135	static struct nft_expr_type nft_socket_type __read_mostly = {
	136	.name = "socket",
	137	.ops = &nft_socket_ops,
	138	.policy = nft_socket_policy,
	139	.maxattr = NFTA_SOCKET_MAX,
	140	.owner = THIS_MODULE,
	141	};
	142
	143	static int __init nft_socket_module_init(void)
	144	{
	145	return nft_register_expr(&nft_socket_type);
	146	}
	147
	148	static void __exit nft_socket_module_exit(void)
	149	{
	150	nft_unregister_expr(&nft_socket_type);
	151	}
	152
	153	module_init(nft_socket_module_init);
	154	module_exit(nft_socket_module_exit);
	155
	156	MODULE_LICENSE("GPL");
	157	MODULE_AUTHOR("Máté Eckl");
	158	MODULE_DESCRIPTION("nf_tables socket match module");
3fb61eca	159	MODULE_ALIAS_NFT_EXPR("socket");