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netfilter: bitwise: add NFTA_BITWISE_DATA attribute.

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Add a new bitwise netlink attribute that will be used by shift
operations to store the size of the shift.  It is not used by boolean
operations.

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Jeremy Sowden 2020-01-15 20:05:56 +00:00 committed by Pablo Neira Ayuso
parent ed991d4363
commit 779f725e14
2 changed files with 8 additions and 0 deletions
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3
include/uapi/linux/netfilter/nf_tables.h
View file

@ -503,6 +503,8 @@ enum nft_bitwise_ops {
* @NFTA_BITWISE_MASK: mask value (NLA_NESTED: nft_data_attributes)
* @NFTA_BITWISE_XOR: xor value (NLA_NESTED: nft_data_attributes)
* @NFTA_BITWISE_OP: type of operation (NLA_U32: nft_bitwise_ops)
* @NFTA_BITWISE_DATA: argument for non-boolean operations
* (NLA_NESTED: nft_data_attributes)
*
* The bitwise expression performs the following operation:
*
@ -524,6 +526,7 @@ enum nft_bitwise_attributes {
NFTA_BITWISE_MASK,
NFTA_BITWISE_XOR,
NFTA_BITWISE_OP,
NFTA_BITWISE_DATA,
__NFTA_BITWISE_MAX
};
#define NFTA_BITWISE_MAX (__NFTA_BITWISE_MAX - 1)

5
net/netfilter/nft_bitwise.c
View file

@ -22,6 +22,7 @@ struct nft_bitwise {
u8 len;
struct nft_data mask;
struct nft_data xor;
struct nft_data data;
};
static void nft_bitwise_eval_bool(u32 *dst, const u32 *src,
@ -54,6 +55,7 @@ static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = {
[NFTA_BITWISE_MASK] = { .type = NLA_NESTED },
[NFTA_BITWISE_XOR] = { .type = NLA_NESTED },
[NFTA_BITWISE_OP] = { .type = NLA_U32 },
[NFTA_BITWISE_DATA] = { .type = NLA_NESTED },
};
static int nft_bitwise_init_bool(struct nft_bitwise *priv,
@ -62,6 +64,9 @@ static int nft_bitwise_init_bool(struct nft_bitwise *priv,
struct nft_data_desc d1, d2;
int err;
if (tb[NFTA_BITWISE_DATA])
return -EINVAL;
if (!tb[NFTA_BITWISE_MASK] ||
!tb[NFTA_BITWISE_XOR])
return -EINVAL;