netfilter: nf_tables: make valid_genid callback mandatory

always call this function, followup patch can use this to
aquire a per-netns transaction log to guard the entire batch
instead of using the nfnl susbsys mutex (which is shared among all
namespaces).

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

2 files changed, 3 insertions, 3 deletions

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 5e95e92e547b..594b395442d6 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6591,7 +6591,7 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb)
 
 static bool nf_tables_valid_genid(struct net *net, u32 genid)
 {
-        return net->nft.base_seq == genid;
+        return genid == 0 || net->nft.base_seq == genid;
 }
 
 static const struct nfnetlink_subsystem nf_tables_subsys = {
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index e1b6be29848d..94f9bcaa0799 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -331,13 +331,13 @@ replay:
                 }
         }
 
-        if (!ss->commit || !ss->abort) {
+        if (!ss->valid_genid || !ss->commit || !ss->abort) {
                 nfnl_unlock(subsys_id);
                 netlink_ack(oskb, nlh, -EOPNOTSUPP, NULL);
                 return kfree_skb(skb);
         }
 
-        if (genid && ss->valid_genid && !ss->valid_genid(net, genid)) {
+        if (!ss->valid_genid(net, genid)) {
                 nfnl_unlock(subsys_id);
                 netlink_ack(oskb, nlh, -ERESTART, NULL);
                 return kfree_skb(skb);