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netfilter: nft_exthdr: Add support for existence check

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If NFT_EXTHDR_F_PRESENT is set, exthdr will not copy any header field
data into *dest, but instead set it to 1 if the header is found and 0
otherwise.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter 2017-01-17 22:51:26 +01:00 • committed by Pablo Neira Ayuso
parent 6e7bc478c9
commit c078ca3b0c
2 changed files with 26 additions and 2 deletions
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6
include/uapi/linux/netfilter/nf_tables.h
View file

@ -704,6 +704,10 @@ enum nft_payload_attributes {
};
#define NFTA_PAYLOAD_MAX (__NFTA_PAYLOAD_MAX - 1)
enum nft_exthdr_flags {
NFT_EXTHDR_F_PRESENT = (1 << 0),
};
/**
* enum nft_exthdr_attributes - nf_tables IPv6 extension header expression netlink attributes
*
@ -711,6 +715,7 @@ enum nft_payload_attributes {
* @NFTA_EXTHDR_TYPE: extension header type (NLA_U8)
* @NFTA_EXTHDR_OFFSET: extension header offset (NLA_U32)
* @NFTA_EXTHDR_LEN: extension header length (NLA_U32)
* @NFTA_EXTHDR_FLAGS: extension header flags (NLA_U32)
*/
enum nft_exthdr_attributes {
NFTA_EXTHDR_UNSPEC,
@ -718,6 +723,7 @@ enum nft_exthdr_attributes {
NFTA_EXTHDR_TYPE,
NFTA_EXTHDR_OFFSET,
NFTA_EXTHDR_LEN,
NFTA_EXTHDR_FLAGS,
__NFTA_EXTHDR_MAX
};
#define NFTA_EXTHDR_MAX (__NFTA_EXTHDR_MAX - 1)