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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2017-02-10 14:08:20 +0300 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2017-02-12 16:45:12 +0300 |
| commit | 74e8bcd21c40dbbb3d74fa904536f8a3bddafed3 (patch) | |
| tree | a628fe0f58c4c73e877e8f33b923f99e45814641 | |
| parent | 8c4d4e8b5626fec965fd5034e5bd5e57790f243f (diff) | |
| download | linux-74e8bcd21c40dbbb3d74fa904536f8a3bddafed3.tar.xz | |
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>
| -rw-r--r-- | net/netfilter/nf_tables_api.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index cb6ae46f6c48..71c60a04b66b 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, |