mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-27 12:57:53 +00:00
7d34aa3e03
Add a 'reset' flag just like with nft_object_ops::dump. This will be useful to reset "anonymous stateful objects", e.g. simple rule counters. No functional change intended. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
150 lines
3.6 KiB
C
150 lines
3.6 KiB
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(®s->data[priv->sreg], &priv->data_from, priv->len);
|
|
d2 = memcmp(®s->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,
|
|
};
|