[mirror_ubuntu-hirsute-kernel.git] / net / netfilter / nft_bitwise.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
 *
 * Development of this code funded by Astaro AG (http://www.astaro.com/)
 */

#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_bitwise {
	enum nft_registers	sreg:8;
	enum nft_registers	dreg:8;
	u8			len;
	struct nft_data		mask;
	struct nft_data		xor;
};

void nft_bitwise_eval(const struct nft_expr *expr,
		      struct nft_regs *regs, const struct nft_pktinfo *pkt)
{
	const struct nft_bitwise *priv = nft_expr_priv(expr);
	const u32 *src = &regs->data[priv->sreg];
	u32 *dst = &regs->data[priv->dreg];
	unsigned int i;

	for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++)
		dst[i] = (src[i] & priv->mask.data[i]) ^ priv->xor.data[i];
}

static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = {
	[NFTA_BITWISE_SREG]	= { .type = NLA_U32 },
	[NFTA_BITWISE_DREG]	= { .type = NLA_U32 },
	[NFTA_BITWISE_LEN]	= { .type = NLA_U32 },
	[NFTA_BITWISE_MASK]	= { .type = NLA_NESTED },
	[NFTA_BITWISE_XOR]	= { .type = NLA_NESTED },
};

static int nft_bitwise_init(const struct nft_ctx *ctx,
			    const struct nft_expr *expr,
			    const struct nlattr * const tb[])
{
	struct nft_bitwise *priv = nft_expr_priv(expr);
	struct nft_data_desc d1, d2;
	u32 len;
	int err;

	if (tb[NFTA_BITWISE_SREG] == NULL ||
	    tb[NFTA_BITWISE_DREG] == NULL ||
	    tb[NFTA_BITWISE_LEN] == NULL ||
	    tb[NFTA_BITWISE_MASK] == NULL ||
	    tb[NFTA_BITWISE_XOR] == NULL)
		return -EINVAL;

	err = nft_parse_u32_check(tb[NFTA_BITWISE_LEN], U8_MAX, &len);
	if (err < 0)
		return err;

	priv->len = len;

	priv->sreg = nft_parse_register(tb[NFTA_BITWISE_SREG]);
	err = nft_validate_register_load(priv->sreg, priv->len);
	if (err < 0)
		return err;

	priv->dreg = nft_parse_register(tb[NFTA_BITWISE_DREG]);
	err = nft_validate_register_store(ctx, priv->dreg, NULL,
					  NFT_DATA_VALUE, priv->len);
	if (err < 0)
		return err;

	err = nft_data_init(NULL, &priv->mask, sizeof(priv->mask), &d1,
			    tb[NFTA_BITWISE_MASK]);
	if (err < 0)
		return err;
	if (d1.len != priv->len) {
		err = -EINVAL;
		goto err1;
	}

	err = nft_data_init(NULL, &priv->xor, sizeof(priv->xor), &d2,
			    tb[NFTA_BITWISE_XOR]);
	if (err < 0)
		goto err1;
	if (d2.len != priv->len) {
		err = -EINVAL;
		goto err2;
	}

	return 0;
err2:
	nft_data_release(&priv->xor, d2.type);
err1:
	nft_data_release(&priv->mask, d1.type);
	return err;
}

static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
	const struct nft_bitwise *priv = nft_expr_priv(expr);

	if (nft_dump_register(skb, NFTA_BITWISE_SREG, priv->sreg))
		goto nla_put_failure;
	if (nft_dump_register(skb, NFTA_BITWISE_DREG, priv->dreg))
		goto nla_put_failure;
	if (nla_put_be32(skb, NFTA_BITWISE_LEN, htonl(priv->len)))
		goto nla_put_failure;

	if (nft_data_dump(skb, NFTA_BITWISE_MASK, &priv->mask,
			  NFT_DATA_VALUE, priv->len) < 0)
		goto nla_put_failure;

	if (nft_data_dump(skb, NFTA_BITWISE_XOR, &priv->xor,
			  NFT_DATA_VALUE, priv->len) < 0)
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -1;
}

static const struct nft_expr_ops nft_bitwise_ops = {
	.type		= &nft_bitwise_type,
	.size		= NFT_EXPR_SIZE(sizeof(struct nft_bitwise)),
	.eval		= nft_bitwise_eval,
	.init		= nft_bitwise_init,
	.dump		= nft_bitwise_dump,
};

struct nft_expr_type nft_bitwise_type __read_mostly = {
	.name		= "bitwise",
	.ops		= &nft_bitwise_ops,
	.policy		= nft_bitwise_policy,
	.maxattr	= NFTA_BITWISE_MAX,
	.owner		= THIS_MODULE,
};
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
96518518	2	/*
ef1f7df9	3	* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
96518518	4	*
96518518 PM	5	* Development of this code funded by Astaro AG (http://www.astaro.com/)
	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/init.h>
	10	#include <linux/module.h>
	11	#include <linux/netlink.h>
	12	#include <linux/netfilter.h>
	13	#include <linux/netfilter/nf_tables.h>
	14	#include <net/netfilter/nf_tables_core.h>
	15	#include <net/netfilter/nf_tables.h>
	16
	17	struct nft_bitwise {
	18	enum nft_registers sreg:8;
	19	enum nft_registers dreg:8;
	20	u8 len;
	21	struct nft_data mask;
	22	struct nft_data xor;
	23	};
	24
10870dd8 FW	25	void nft_bitwise_eval(const struct nft_expr *expr,
10870dd8 FW	26	struct nft_regs regs, const struct nft_pktinfo pkt)
96518518 PM	27	{
96518518 PM	28	const struct nft_bitwise *priv = nft_expr_priv(expr);
49499c3e PM	29	const u32 *src = &regs->data[priv->sreg];
49499c3e PM	30	u32 *dst = &regs->data[priv->dreg];
96518518 PM	31	unsigned int i;
96518518 PM	32
fad136ea PM	33	for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++)
fad136ea PM	34	dst[i] = (src[i] & priv->mask.data[i]) ^ priv->xor.data[i];
96518518 PM	35	}
	36
	37	static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = {
	38	[NFTA_BITWISE_SREG] = { .type = NLA_U32 },
	39	[NFTA_BITWISE_DREG] = { .type = NLA_U32 },
	40	[NFTA_BITWISE_LEN] = { .type = NLA_U32 },
	41	[NFTA_BITWISE_MASK] = { .type = NLA_NESTED },
	42	[NFTA_BITWISE_XOR] = { .type = NLA_NESTED },
	43	};
	44
	45	static int nft_bitwise_init(const struct nft_ctx *ctx,
	46	const struct nft_expr *expr,
	47	const struct nlattr * const tb[])
	48	{
	49	struct nft_bitwise *priv = nft_expr_priv(expr);
	50	struct nft_data_desc d1, d2;
36b701fa	51	u32 len;
96518518 PM	52	int err;
	53
	54	if (tb[NFTA_BITWISE_SREG] == NULL \|\|
	55	tb[NFTA_BITWISE_DREG] == NULL \|\|
	56	tb[NFTA_BITWISE_LEN] == NULL \|\|
	57	tb[NFTA_BITWISE_MASK] == NULL \|\|
	58	tb[NFTA_BITWISE_XOR] == NULL)
	59	return -EINVAL;
	60
36b701fa LGL	61	err = nft_parse_u32_check(tb[NFTA_BITWISE_LEN], U8_MAX, &len);
	62	if (err < 0)
	63	return err;
	64
	65	priv->len = len;
	66
b1c96ed3	67	priv->sreg = nft_parse_register(tb[NFTA_BITWISE_SREG]);
d07db988	68	err = nft_validate_register_load(priv->sreg, priv->len);
96518518 PM	69	if (err < 0)
	70	return err;
	71
b1c96ed3	72	priv->dreg = nft_parse_register(tb[NFTA_BITWISE_DREG]);
1ec10212 PM	73	err = nft_validate_register_store(ctx, priv->dreg, NULL,
1ec10212 PM	74	NFT_DATA_VALUE, priv->len);
96518518 PM	75	if (err < 0)
	76	return err;
	77
d0a11fc3 PM	78	err = nft_data_init(NULL, &priv->mask, sizeof(priv->mask), &d1,
d0a11fc3 PM	79	tb[NFTA_BITWISE_MASK]);
96518518 PM	80	if (err < 0)
96518518 PM	81	return err;
71df14b0 PNA	82	if (d1.len != priv->len) {
	83	err = -EINVAL;
	84	goto err1;
	85	}
96518518	86
d0a11fc3 PM	87	err = nft_data_init(NULL, &priv->xor, sizeof(priv->xor), &d2,
d0a11fc3 PM	88	tb[NFTA_BITWISE_XOR]);
96518518	89	if (err < 0)
71df14b0 PNA	90	goto err1;
	91	if (d2.len != priv->len) {
	92	err = -EINVAL;
	93	goto err2;
	94	}
96518518 PM	95
96518518 PM	96	return 0;
71df14b0	97	err2:
59105446	98	nft_data_release(&priv->xor, d2.type);
71df14b0	99	err1:
59105446	100	nft_data_release(&priv->mask, d1.type);
71df14b0	101	return err;
96518518 PM	102	}
	103
	104	static int nft_bitwise_dump(struct sk_buff skb, const struct nft_expr expr)
	105	{
	106	const struct nft_bitwise *priv = nft_expr_priv(expr);
	107
b1c96ed3	108	if (nft_dump_register(skb, NFTA_BITWISE_SREG, priv->sreg))
96518518	109	goto nla_put_failure;
b1c96ed3	110	if (nft_dump_register(skb, NFTA_BITWISE_DREG, priv->dreg))
96518518 PM	111	goto nla_put_failure;
	112	if (nla_put_be32(skb, NFTA_BITWISE_LEN, htonl(priv->len)))
	113	goto nla_put_failure;
	114
	115	if (nft_data_dump(skb, NFTA_BITWISE_MASK, &priv->mask,
	116	NFT_DATA_VALUE, priv->len) < 0)
	117	goto nla_put_failure;
	118
	119	if (nft_data_dump(skb, NFTA_BITWISE_XOR, &priv->xor,
	120	NFT_DATA_VALUE, priv->len) < 0)
	121	goto nla_put_failure;
	122
	123	return 0;
	124
	125	nla_put_failure:
	126	return -1;
	127	}
	128
ef1f7df9 PM	129	static const struct nft_expr_ops nft_bitwise_ops = {
ef1f7df9 PM	130	.type = &nft_bitwise_type,
96518518	131	.size = NFT_EXPR_SIZE(sizeof(struct nft_bitwise)),
96518518 PM	132	.eval = nft_bitwise_eval,
	133	.init = nft_bitwise_init,
	134	.dump = nft_bitwise_dump,
ef1f7df9 PM	135	};
ef1f7df9 PM	136
4e24877e	137	struct nft_expr_type nft_bitwise_type __read_mostly = {
ef1f7df9 PM	138	.name = "bitwise",
ef1f7df9 PM	139	.ops = &nft_bitwise_ops,
96518518 PM	140	.policy = nft_bitwise_policy,
96518518 PM	141	.maxattr = NFTA_BITWISE_MAX,
ef1f7df9	142	.owner = THIS_MODULE,
96518518	143	};