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netfilter: nf_tables: add check_genid to the nfnetlink subsystem

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This patch implements the check generation id as provided by nfnetlink.
This allows us to reject ruleset updates against stale baseline, so
userspace can retry update with a fresh ruleset cache.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2017-02-10 12:08:20 +01:00
parent 8c4d4e8b56
commit 74e8bcd21c
1 changed files with 6 additions and 0 deletions
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6
net/netfilter/nf_tables_api.c
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@ -4972,6 +4972,11 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb)
return 0;
}
static bool nf_tables_valid_genid(struct net *net, u32 genid)
{
return net->nft.base_seq == genid;
}
static const struct nfnetlink_subsystem nf_tables_subsys = {
.name = "nf_tables",
.subsys_id = NFNL_SUBSYS_NFTABLES,
@ -4979,6 +4984,7 @@ static const struct nfnetlink_subsystem nf_tables_subsys = {
.cb = nf_tables_cb,
.commit = nf_tables_commit,
.abort = nf_tables_abort,
.valid_genid = nf_tables_valid_genid,
};
int nft_chain_validate_dependency(const struct nft_chain *chain,