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netfilter: nft_fib: Support existence check

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Instead of the actual interface index or name, set destination register
to just 1 or 0 depending on whether the lookup succeeded or not if
NFTA_FIB_F_PRESENT was set in userspace.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter
2017-03-10 18:08:02 +01:00
committed by Pablo Neira Ayuso
parent 1a64edf54f
commit 055c4b34b9
5 changed files with 14 additions and 9 deletions
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1
include/uapi/linux/netfilter/nf_tables.h
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@@ -1257,6 +1257,7 @@ enum nft_fib_flags {
NFTA_FIB_F_MARK = 1 << 2, /* use skb->mark */
NFTA_FIB_F_IIF = 1 << 3, /* restrict to iif */
NFTA_FIB_F_OIF = 1 << 4, /* restrict to oif */
NFTA_FIB_F_PRESENT = 1 << 5, /* check existence only */
};
enum nft_ct_helper_attributes {