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netfilter: nf_tables: add userdata attributes to nft_chain

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Enables storing userdata for nft_chain. Field udata points to user data
and udlen stores its length.

Adds new attribute flag NFTA_CHAIN_USERDATA.

Signed-off-by: Jose M. Guisado Gomez <guigom@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Jose M. Guisado Gomez 2020-09-28 14:27:10 +02:00 • committed by Pablo Neira Ayuso
parent 85db827a57
commit 002f217653
3 changed files with 29 additions and 8 deletions
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2
include/uapi/linux/netfilter/nf_tables.h
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@ -208,6 +208,7 @@ enum nft_chain_flags {
* @NFTA_CHAIN_COUNTERS: counter specification of the chain (NLA_NESTED: nft_counter_attributes)
* @NFTA_CHAIN_FLAGS: chain flags
* @NFTA_CHAIN_ID: uniquely identifies a chain in a transaction (NLA_U32)
* @NFTA_CHAIN_USERDATA: user data (NLA_BINARY)
*/
enum nft_chain_attributes {
NFTA_CHAIN_UNSPEC,
@ -222,6 +223,7 @@ enum nft_chain_attributes {
NFTA_CHAIN_PAD,
NFTA_CHAIN_FLAGS,
NFTA_CHAIN_ID,
NFTA_CHAIN_USERDATA,
__NFTA_CHAIN_MAX
};
#define NFTA_CHAIN_MAX (__NFTA_CHAIN_MAX - 1)