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netfilter: nf_tables: add support for dynamic set updates

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Add a new "dynset" expression for dynamic set updates.

A new set op ->update() is added which, for non existant elements,
invokes an initialization callback and inserts the new element.
For both new or existing elements the extenstion pointer is returned
to the caller to optionally perform timer updates or other actions.

Element removal is not supported so far, however that seems to be a
rather exotic need and can be added later on.

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 14:41:08 +02:00
committed by Pablo Neira Ayuso
parent 11113e190b
commit 22fe54d5fe
8 changed files with 315 additions and 6 deletions
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27
include/uapi/linux/netfilter/nf_tables.h
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@@ -515,6 +515,33 @@ enum nft_lookup_attributes {
};
#define NFTA_LOOKUP_MAX (__NFTA_LOOKUP_MAX - 1)
enum nft_dynset_ops {
NFT_DYNSET_OP_ADD,
NFT_DYNSET_OP_UPDATE,
};
/**
* enum nft_dynset_attributes - dynset expression attributes
*
* @NFTA_DYNSET_SET_NAME: name of set the to add data to (NLA_STRING)
* @NFTA_DYNSET_SET_ID: uniquely identifier of the set in the transaction (NLA_U32)
* @NFTA_DYNSET_OP: operation (NLA_U32)
* @NFTA_DYNSET_SREG_KEY: source register of the key (NLA_U32)
* @NFTA_DYNSET_SREG_DATA: source register of the data (NLA_U32)
* @NFTA_DYNSET_TIMEOUT: timeout value for the new element (NLA_U64)
*/
enum nft_dynset_attributes {
NFTA_DYNSET_UNSPEC,
NFTA_DYNSET_SET_NAME,
NFTA_DYNSET_SET_ID,
NFTA_DYNSET_OP,
NFTA_DYNSET_SREG_KEY,
NFTA_DYNSET_SREG_DATA,
NFTA_DYNSET_TIMEOUT,
__NFTA_DYNSET_MAX,
};
#define NFTA_DYNSET_MAX (__NFTA_DYNSET_MAX - 1)
/**
* enum nft_payload_bases - nf_tables payload expression offset bases
*