// 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]		= NLA_POLICY_MAX(NLA_BE32, NFT_REG32_MAX),	[NFTA_RANGE_OP]			= NLA_POLICY_MAX(NLA_BE32, 255),	[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(ctx, 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,}; 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,};