From 74e8bcd21c40dbbb3d74fa904536f8a3bddafed3 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Fri, 10 Feb 2017 12:08:20 +0100 Subject: [PATCH] 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 --- net/netfilter/nf_tables_api.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index cb6ae46f6c48e5..71c60a04b66b1f 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,