From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Fri, 10 Feb 2017 11:08:20 +0000 (+0100)
Subject: netfilter: nf_tables: add check_genid to the nfnetlink subsystem
X-Git-Tag: v5.15~11849^2~137^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=74e8bcd21c40dbbb3d74fa904536f8a3bddafed3;p=platform%2Fkernel%2Flinux-starfive.git

netfilter: nf_tables: add check_genid to the nfnetlink subsystem

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>
---

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index cb6ae46..71c60a0 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -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,