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netfilter: nf_tables: support optional userdata for set elements

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Add an userdata set extension and allow the user to attach arbitrary
data to set elements. This is intended to hold TLV encoded data like
comments or DNS annotations that have no meaning to the kernel.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy
2015-04-05 14:43:38 +02:00
committed by Pablo Neira Ayuso
parent 22fe54d5fe
commit 68e942e88a
3 changed files with 43 additions and 0 deletions
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2
include/uapi/linux/netfilter/nf_tables.h
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@@ -292,6 +292,7 @@ enum nft_set_elem_flags {
* @NFTA_SET_ELEM_FLAGS: bitmask of nft_set_elem_flags (NLA_U32)
* @NFTA_SET_ELEM_TIMEOUT: timeout value (NLA_U64)
* @NFTA_SET_ELEM_EXPIRATION: expiration time (NLA_U64)
* @NFTA_SET_ELEM_USERDATA: user data (NLA_BINARY)
*/
enum nft_set_elem_attributes {
NFTA_SET_ELEM_UNSPEC,
@@ -300,6 +301,7 @@ enum nft_set_elem_attributes {
NFTA_SET_ELEM_FLAGS,
NFTA_SET_ELEM_TIMEOUT,
NFTA_SET_ELEM_EXPIRATION,
NFTA_SET_ELEM_USERDATA,
__NFTA_SET_ELEM_MAX
};
#define NFTA_SET_ELEM_MAX (__NFTA_SET_ELEM_MAX - 1)