[linux-block.git] / net / netfilter / nft_range.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>

struct nft_range_expr {
	struct nft_data		data_from;
	struct nft_data		data_to;
	u8			sreg;
	u8			len;
	enum nft_range_ops	op:8;
};

void nft_range_eval(const struct nft_expr *expr,
		    struct nft_regs *regs, const struct nft_pktinfo *pkt)
{
	const struct nft_range_expr *priv = nft_expr_priv(expr);
	int d1, d2;

	d1 = memcmp(&regs->data[priv->sreg], &priv->data_from, priv->len);
	d2 = memcmp(&regs->data[priv->sreg], &priv->data_to, priv->len);
	switch (priv->op) {
	case NFT_RANGE_EQ:
		if (d1 < 0 || d2 > 0)
			regs->verdict.code = NFT_BREAK;
		break;
	case NFT_RANGE_NEQ:
		if (d1 >= 0 && d2 <= 0)
			regs->verdict.code = NFT_BREAK;
		break;
	}
}

static const struct nla_policy nft_range_policy[NFTA_RANGE_MAX + 1] = {
	[NFTA_RANGE_SREG]		= { .type = NLA_U32 },
	[NFTA_RANGE_OP]			= { .type = NLA_U32 },
	[NFTA_RANGE_FROM_DATA]		= { .type = NLA_NESTED },
	[NFTA_RANGE_TO_DATA]		= { .type = NLA_NESTED },
};

static int nft_range_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
			const struct nlattr * const tb[])
{
	struct nft_range_expr *priv = nft_expr_priv(expr);
	struct nft_data_desc desc_from = {
		.type	= NFT_DATA_VALUE,
		.size	= sizeof(priv->data_from),
	};
	struct nft_data_desc desc_to = {
		.type	= NFT_DATA_VALUE,
		.size	= sizeof(priv->data_to),
	};
	int err;
	u32 op;

	if (!tb[NFTA_RANGE_SREG]      ||
	    !tb[NFTA_RANGE_OP]	      ||
	    !tb[NFTA_RANGE_FROM_DATA] ||
	    !tb[NFTA_RANGE_TO_DATA])
		return -EINVAL;

	err = nft_data_init(NULL, &priv->data_from, &desc_from,
			    tb[NFTA_RANGE_FROM_DATA]);
	if (err < 0)
		return err;

	err = nft_data_init(NULL, &priv->data_to, &desc_to,
			    tb[NFTA_RANGE_TO_DATA]);
	if (err < 0)
		goto err1;

	if (desc_from.len != desc_to.len) {
		err = -EINVAL;
		goto err2;
	}

	err = nft_parse_register_load(tb[NFTA_RANGE_SREG], &priv->sreg,
				      desc_from.len);
	if (err < 0)
		goto err2;

	err = nft_parse_u32_check(tb[NFTA_RANGE_OP], U8_MAX, &op);
	if (err < 0)
		goto err2;

	switch (op) {
	case NFT_RANGE_EQ:
	case NFT_RANGE_NEQ:
		break;
	default:
		err = -EINVAL;
		goto err2;
	}

	priv->op  = op;
	priv->len = desc_from.len;
	return 0;
err2:
	nft_data_release(&priv->data_to, desc_to.type);
err1:
	nft_data_release(&priv->data_from, desc_from.type);
	return err;
}

static int nft_range_dump(struct sk_buff *skb,
			  const struct nft_expr *expr, bool reset)
{
	const struct nft_range_expr *priv = nft_expr_priv(expr);

	if (nft_dump_register(skb, NFTA_RANGE_SREG, priv->sreg))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_RANGE_OP, htonl(priv->op)))
		goto nla_put_failure;

	if (nft_data_dump(skb, NFTA_RANGE_FROM_DATA, &priv->data_from,
			  NFT_DATA_VALUE, priv->len) < 0 ||
	    nft_data_dump(skb, NFTA_RANGE_TO_DATA, &priv->data_to,
			  NFT_DATA_VALUE, priv->len) < 0)
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}

static const struct nft_expr_ops nft_range_ops = {
	.type		= &nft_range_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_range_expr)),
	.eval		= nft_range_eval,
	.init		= nft_range_init,
	.dump		= nft_range_dump,
	.reduce		= NFT_REDUCE_READONLY,
};

struct nft_expr_type nft_range_type __read_mostly = {
	.name		= "range",
	.ops		= &nft_range_ops,
	.policy		= nft_range_policy,
	.maxattr	= NFTA_RANGE_MAX,
	.owner		= THIS_MODULE,
};
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
0f3cd9b3 PNA	2	/*
0f3cd9b3 PNA	3	* Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
0f3cd9b3 PNA	4	*/
	5
	6	#include <linux/kernel.h>
	7	#include <linux/init.h>
	8	#include <linux/module.h>
	9	#include <linux/netlink.h>
	10	#include <linux/netfilter.h>
	11	#include <linux/netfilter/nf_tables.h>
	12	#include <net/netfilter/nf_tables_core.h>
	13	#include <net/netfilter/nf_tables.h>
	14
	15	struct nft_range_expr {
	16	struct nft_data data_from;
	17	struct nft_data data_to;
4f16d25c	18	u8 sreg;
0f3cd9b3 PNA	19	u8 len;
	20	enum nft_range_ops op:8;
	21	};
	22
10870dd8 FW	23	void nft_range_eval(const struct nft_expr *expr,
10870dd8 FW	24	struct nft_regs regs, const struct nft_pktinfo pkt)
0f3cd9b3 PNA	25	{
0f3cd9b3 PNA	26	const struct nft_range_expr *priv = nft_expr_priv(expr);
0f3cd9b3 PNA	27	int d1, d2;
	28
	29	d1 = memcmp(&regs->data[priv->sreg], &priv->data_from, priv->len);
	30	d2 = memcmp(&regs->data[priv->sreg], &priv->data_to, priv->len);
	31	switch (priv->op) {
	32	case NFT_RANGE_EQ:
d2e4d593 AB	33	if (d1 < 0 \|\| d2 > 0)
d2e4d593 AB	34	regs->verdict.code = NFT_BREAK;
0f3cd9b3 PNA	35	break;
0f3cd9b3 PNA	36	case NFT_RANGE_NEQ:
d2e4d593 AB	37	if (d1 >= 0 && d2 <= 0)
d2e4d593 AB	38	regs->verdict.code = NFT_BREAK;
0f3cd9b3 PNA	39	break;
0f3cd9b3 PNA	40	}
0f3cd9b3 PNA	41	}
	42
	43	static const struct nla_policy nft_range_policy[NFTA_RANGE_MAX + 1] = {
	44	[NFTA_RANGE_SREG] = { .type = NLA_U32 },
	45	[NFTA_RANGE_OP] = { .type = NLA_U32 },
	46	[NFTA_RANGE_FROM_DATA] = { .type = NLA_NESTED },
	47	[NFTA_RANGE_TO_DATA] = { .type = NLA_NESTED },
	48	};
	49
	50	static int nft_range_init(const struct nft_ctx ctx, const struct nft_expr expr,
	51	const struct nlattr * const tb[])
	52	{
	53	struct nft_range_expr *priv = nft_expr_priv(expr);
341b6941 PNA	54	struct nft_data_desc desc_from = {
	55	.type = NFT_DATA_VALUE,
	56	.size = sizeof(priv->data_from),
	57	};
	58	struct nft_data_desc desc_to = {
	59	.type = NFT_DATA_VALUE,
	60	.size = sizeof(priv->data_to),
	61	};
0f3cd9b3	62	int err;
ccca6607	63	u32 op;
0f3cd9b3	64
49cdc4c7 LZ	65	if (!tb[NFTA_RANGE_SREG] \|\|
	66	!tb[NFTA_RANGE_OP] \|\|
	67	!tb[NFTA_RANGE_FROM_DATA] \|\|
	68	!tb[NFTA_RANGE_TO_DATA])
	69	return -EINVAL;
	70
341b6941 PNA	71	err = nft_data_init(NULL, &priv->data_from, &desc_from,
341b6941 PNA	72	tb[NFTA_RANGE_FROM_DATA]);
0f3cd9b3 PNA	73	if (err < 0)
	74	return err;
	75
341b6941 PNA	76	err = nft_data_init(NULL, &priv->data_to, &desc_to,
341b6941 PNA	77	tb[NFTA_RANGE_TO_DATA]);
0f3cd9b3 PNA	78	if (err < 0)
	79	goto err1;
	80
	81	if (desc_from.len != desc_to.len) {
	82	err = -EINVAL;
	83	goto err2;
	84	}
	85
4f16d25c PNA	86	err = nft_parse_register_load(tb[NFTA_RANGE_SREG], &priv->sreg,
4f16d25c PNA	87	desc_from.len);
0f3cd9b3 PNA	88	if (err < 0)
	89	goto err2;
	90
ccca6607 PNA	91	err = nft_parse_u32_check(tb[NFTA_RANGE_OP], U8_MAX, &op);
	92	if (err < 0)
	93	goto err2;
	94
	95	switch (op) {
	96	case NFT_RANGE_EQ:
	97	case NFT_RANGE_NEQ:
	98	break;
	99	default:
	100	err = -EINVAL;
	101	goto err2;
	102	}
	103
	104	priv->op = op;
0f3cd9b3 PNA	105	priv->len = desc_from.len;
	106	return 0;
	107	err2:
59105446	108	nft_data_release(&priv->data_to, desc_to.type);
0f3cd9b3	109	err1:
59105446	110	nft_data_release(&priv->data_from, desc_from.type);
0f3cd9b3 PNA	111	return err;
	112	}
	113
7d34aa3e PS	114	static int nft_range_dump(struct sk_buff *skb,
7d34aa3e PS	115	const struct nft_expr *expr, bool reset)
0f3cd9b3 PNA	116	{
	117	const struct nft_range_expr *priv = nft_expr_priv(expr);
	118
	119	if (nft_dump_register(skb, NFTA_RANGE_SREG, priv->sreg))
	120	goto nla_put_failure;
	121	if (nla_put_be32(skb, NFTA_RANGE_OP, htonl(priv->op)))
	122	goto nla_put_failure;
	123
	124	if (nft_data_dump(skb, NFTA_RANGE_FROM_DATA, &priv->data_from,
	125	NFT_DATA_VALUE, priv->len) < 0 \|\|
	126	nft_data_dump(skb, NFTA_RANGE_TO_DATA, &priv->data_to,
	127	NFT_DATA_VALUE, priv->len) < 0)
	128	goto nla_put_failure;
	129	return 0;
	130
	131	nla_put_failure:
	132	return -1;
	133	}
	134
0f3cd9b3 PNA	135	static const struct nft_expr_ops nft_range_ops = {
	136	.type = &nft_range_type,
	137	.size = NFT_EXPR_SIZE(sizeof(struct nft_range_expr)),
	138	.eval = nft_range_eval,
	139	.init = nft_range_init,
	140	.dump = nft_range_dump,
b2d30654	141	.reduce = NFT_REDUCE_READONLY,
0f3cd9b3 PNA	142	};
0f3cd9b3 PNA	143
4e24877e	144	struct nft_expr_type nft_range_type __read_mostly = {
0f3cd9b3 PNA	145	.name = "range",
	146	.ops = &nft_range_ops,
	147	.policy = nft_range_policy,
	148	.maxattr = NFTA_RANGE_MAX,
	149	.owner = THIS_MODULE,
	150	};