ipv6: fib_rules: Check if rule is a default rule

As explained in commit 3c71006d15fd ("ipv4: fib_rules: Check if rule is
a default rule"), drivers supporting IPv6 FIB offload need to be able to
sanitize the rules they don't support and potentially flush their
tables.

Add an IPv6 helper to check if a FIB rule is a default rule.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 0 deletions

diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index ec849d88a662..ef1fcee6bf16 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -29,6 +29,26 @@ struct fib6_rule {
         u8                      tclass;
 };
 
+static bool fib6_rule_matchall(const struct fib_rule *rule)
+{
+        struct fib6_rule *r = container_of(rule, struct fib6_rule, common);
+
+        if (r->dst.plen || r->src.plen || r->tclass)
+                return false;
+        return fib_rule_matchall(rule);
+}
+
+bool fib6_rule_default(const struct fib_rule *rule)
+{
+        if (!fib6_rule_matchall(rule) || rule->action != FR_ACT_TO_TBL ||
+            rule->l3mdev)
+                return false;
+        if (rule->table != RT6_TABLE_LOCAL && rule->table != RT6_TABLE_MAIN)
+                return false;
+        return true;
+}
+EXPORT_SYMBOL_GPL(fib6_rule_default);
+
 struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
                                    int flags, pol_lookup_t lookup)
 {