1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
  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
 15struct nft_range_expr {
 16	struct nft_data		data_from;
 17	struct nft_data		data_to;
 18	u8			sreg;
 19	u8			len;
 20	enum nft_range_ops	op:8;
 21};
 22
 23void nft_range_eval(const struct nft_expr *expr,
 24		    struct nft_regs *regs, const struct nft_pktinfo *pkt)
 25{
 26	const struct nft_range_expr *priv = nft_expr_priv(expr);
 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:
 33		if (d1 < 0 || d2 > 0)
 34			regs->verdict.code = NFT_BREAK;
 35		break;
 36	case NFT_RANGE_NEQ:
 37		if (d1 >= 0 && d2 <= 0)
 38			regs->verdict.code = NFT_BREAK;
 39		break;
 40	}
 41}
 42
 43static 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
 50static 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);
 54	struct nft_data_desc desc_from, desc_to;
 
 
 
 
 
 
 
 55	int err;
 56	u32 op;
 57
 58	if (!tb[NFTA_RANGE_SREG]      ||
 59	    !tb[NFTA_RANGE_OP]	      ||
 60	    !tb[NFTA_RANGE_FROM_DATA] ||
 61	    !tb[NFTA_RANGE_TO_DATA])
 62		return -EINVAL;
 63
 64	err = nft_data_init(NULL, &priv->data_from, sizeof(priv->data_from),
 65			    &desc_from, tb[NFTA_RANGE_FROM_DATA]);
 66	if (err < 0)
 67		return err;
 68
 69	if (desc_from.type != NFT_DATA_VALUE) {
 70		err = -EINVAL;
 71		goto err1;
 72	}
 73
 74	err = nft_data_init(NULL, &priv->data_to, sizeof(priv->data_to),
 75			    &desc_to, tb[NFTA_RANGE_TO_DATA]);
 76	if (err < 0)
 77		goto err1;
 78
 79	if (desc_to.type != NFT_DATA_VALUE) {
 80		err = -EINVAL;
 81		goto err2;
 82	}
 83
 84	if (desc_from.len != desc_to.len) {
 85		err = -EINVAL;
 86		goto err2;
 87	}
 88
 89	err = nft_parse_register_load(tb[NFTA_RANGE_SREG], &priv->sreg,
 90				      desc_from.len);
 91	if (err < 0)
 92		goto err2;
 93
 94	err = nft_parse_u32_check(tb[NFTA_RANGE_OP], U8_MAX, &op);
 95	if (err < 0)
 96		goto err2;
 97
 98	switch (op) {
 99	case NFT_RANGE_EQ:
100	case NFT_RANGE_NEQ:
101		break;
102	default:
103		err = -EINVAL;
104		goto err2;
105	}
106
107	priv->op  = op;
108	priv->len = desc_from.len;
109	return 0;
110err2:
111	nft_data_release(&priv->data_to, desc_to.type);
112err1:
113	nft_data_release(&priv->data_from, desc_from.type);
114	return err;
115}
116
117static int nft_range_dump(struct sk_buff *skb, const struct nft_expr *expr)
 
118{
119	const struct nft_range_expr *priv = nft_expr_priv(expr);
120
121	if (nft_dump_register(skb, NFTA_RANGE_SREG, priv->sreg))
122		goto nla_put_failure;
123	if (nla_put_be32(skb, NFTA_RANGE_OP, htonl(priv->op)))
124		goto nla_put_failure;
125
126	if (nft_data_dump(skb, NFTA_RANGE_FROM_DATA, &priv->data_from,
127			  NFT_DATA_VALUE, priv->len) < 0 ||
128	    nft_data_dump(skb, NFTA_RANGE_TO_DATA, &priv->data_to,
129			  NFT_DATA_VALUE, priv->len) < 0)
130		goto nla_put_failure;
131	return 0;
132
133nla_put_failure:
134	return -1;
135}
136
137static const struct nft_expr_ops nft_range_ops = {
138	.type		= &nft_range_type,
139	.size		= NFT_EXPR_SIZE(sizeof(struct nft_range_expr)),
140	.eval		= nft_range_eval,
141	.init		= nft_range_init,
142	.dump		= nft_range_dump,
 
143};
144
145struct nft_expr_type nft_range_type __read_mostly = {
146	.name		= "range",
147	.ops		= &nft_range_ops,
148	.policy		= nft_range_policy,
149	.maxattr	= NFTA_RANGE_MAX,
150	.owner		= THIS_MODULE,
151};

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
  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
 15struct nft_range_expr {
 16	struct nft_data		data_from;
 17	struct nft_data		data_to;
 18	u8			sreg;
 19	u8			len;
 20	enum nft_range_ops	op:8;
 21};
 22
 23void nft_range_eval(const struct nft_expr *expr,
 24		    struct nft_regs *regs, const struct nft_pktinfo *pkt)
 25{
 26	const struct nft_range_expr *priv = nft_expr_priv(expr);
 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:
 33		if (d1 < 0 || d2 > 0)
 34			regs->verdict.code = NFT_BREAK;
 35		break;
 36	case NFT_RANGE_NEQ:
 37		if (d1 >= 0 && d2 <= 0)
 38			regs->verdict.code = NFT_BREAK;
 39		break;
 40	}
 41}
 42
 43static const struct nla_policy nft_range_policy[NFTA_RANGE_MAX + 1] = {
 44	[NFTA_RANGE_SREG]		= { .type = NLA_U32 },
 45	[NFTA_RANGE_OP]			= NLA_POLICY_MAX(NLA_BE32, 255),
 46	[NFTA_RANGE_FROM_DATA]		= { .type = NLA_NESTED },
 47	[NFTA_RANGE_TO_DATA]		= { .type = NLA_NESTED },
 48};
 49
 50static 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);
 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	};
 62	int err;
 63	u32 op;
 64
 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
 71	err = nft_data_init(NULL, &priv->data_from, &desc_from,
 72			    tb[NFTA_RANGE_FROM_DATA]);
 73	if (err < 0)
 74		return err;
 75
 76	err = nft_data_init(NULL, &priv->data_to, &desc_to,
 77			    tb[NFTA_RANGE_TO_DATA]);
 
 
 
 
 
 78	if (err < 0)
 79		goto err1;
 80
 
 
 
 
 
 81	if (desc_from.len != desc_to.len) {
 82		err = -EINVAL;
 83		goto err2;
 84	}
 85
 86	err = nft_parse_register_load(ctx, tb[NFTA_RANGE_SREG], &priv->sreg,
 87				      desc_from.len);
 88	if (err < 0)
 89		goto err2;
 90
 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;
105	priv->len = desc_from.len;
106	return 0;
107err2:
108	nft_data_release(&priv->data_to, desc_to.type);
109err1:
110	nft_data_release(&priv->data_from, desc_from.type);
111	return err;
112}
113
114static int nft_range_dump(struct sk_buff *skb,
115			  const struct nft_expr *expr, bool reset)
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
131nla_put_failure:
132	return -1;
133}
134
135static 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,
141	.reduce		= NFT_REDUCE_READONLY,
142};
143
144struct nft_expr_type nft_range_type __read_mostly = {
145	.name		= "range",
146	.ops		= &nft_range_ops,
147	.policy		= nft_range_policy,
148	.maxattr	= NFTA_RANGE_MAX,
149	.owner		= THIS_MODULE,
150};