fib_rules: add .suppress operation

[mirror_ubuntu-bionic-kernel.git] / net / ipv4 / fib_rules.c

diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 26aa65d1fce49dfeaa45cbc02046218b5bc70453..9f2906679d1f0c874245381d4b338ce8b1d3965b 100644 (file)
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -101,6 +101,19 @@ errout:
        return err;
 }
 
+static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
+{
+       /* do not accept result if the route does
+        * not meet the required prefix length
+        */
+       struct fib_result *result = (struct fib_result *) arg->result;
+       if (result->prefixlen < rule->table_prefixlen_min) {
+               if (!(arg->flags & FIB_LOOKUP_NOREF))
+                       fib_info_put(result->fi);
+               return true;
+       }
+       return false;
+}
 
 static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
 {
@@ -267,6 +280,7 @@ static const struct fib_rules_ops __net_initconst fib4_rules_ops_template = {
        .rule_size      = sizeof(struct fib4_rule),
        .addr_size      = sizeof(u32),
        .action         = fib4_rule_action,
+       .suppress       = fib4_rule_suppress,
        .match          = fib4_rule_match,
        .configure      = fib4_rule_configure,
        .delete         = fib4_rule_delete,