sugar/linux
1
0
Fork 0
Code Activity

netfilter: nf_tables: add range expression

Browse Source 
Inverse ranges != [a,b] are not currently possible because rules are
composites of && operations, and we need to express this:

	data < a || data > b

This patch adds a new range expression. Positive ranges can be already
through two cmp expressions:

	cmp(sreg, data, >=)
	cmp(sreg, data, <=)

This new range expression provides an alternative way to express this.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso
2016-09-23 15:23:33 +02:00
parent 7a682575ad
commit 0f3cd9b369
5 changed files with 178 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
include/uapi/linux/netfilter/nf_tables.h
View File

@@ -546,6 +546,35 @@ enum nft_cmp_attributes {
};
#define NFTA_CMP_MAX (__NFTA_CMP_MAX - 1)
/**
* enum nft_range_ops - nf_tables range operator
*
* @NFT_RANGE_EQ: equal
* @NFT_RANGE_NEQ: not equal
*/
enum nft_range_ops {
NFT_RANGE_EQ,
NFT_RANGE_NEQ,
};
/**
* enum nft_range_attributes - nf_tables range expression netlink attributes
*
* @NFTA_RANGE_SREG: source register of data to compare (NLA_U32: nft_registers)
* @NFTA_RANGE_OP: cmp operation (NLA_U32: nft_cmp_ops)
* @NFTA_RANGE_FROM_DATA: data range from (NLA_NESTED: nft_data_attributes)
* @NFTA_RANGE_TO_DATA: data range to (NLA_NESTED: nft_data_attributes)
*/
enum nft_range_attributes {
NFTA_RANGE_UNSPEC,
NFTA_RANGE_SREG,
NFTA_RANGE_OP,
NFTA_RANGE_FROM_DATA,
NFTA_RANGE_TO_DATA,
__NFTA_RANGE_MAX
};
#define NFTA_RANGE_MAX (__NFTA_RANGE_MAX - 1)
enum nft_lookup_flags {
NFT_LOOKUP_F_INV = (1 << 0),
};