[NET] fib_rules: Flush route cache after rule modifications

The results of FIB rules lookups are cached in the routing cache
except for IPv6 as no such cache exists. So far, it was the
responsibility of the user to flush the cache after modifying any
rules. This lead to many false bug reports due to misunderstanding
of this concept.

This patch automatically flushes the route cache after inserting
or deleting a rule.

Thanks to Muli Ben-Yehuda <muli@il.ibm.com> for catching a bug
in the previous patch.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
index fd0cc2aa316c..7f58b95b27d1 100644
--- a/net/decnet/dn_rules.c
+++ b/net/decnet/dn_rules.c
@@ -31,6 +31,7 @@
 #include <net/dn_fib.h>
 #include <net/dn_neigh.h>
 #include <net/dn_dev.h>
+#include <net/dn_route.h>
 
 static struct fib_rules_ops dn_fib_rules_ops;
 
@@ -239,6 +240,11 @@ static u32 dn_fib_rule_default_pref(void)
         return 0;
 }
 
+static void dn_fib_rule_flush_cache(void)
+{
+        dn_rt_cache_flush(0);
+}
+
 static struct fib_rules_ops dn_fib_rules_ops = {
         .family         = AF_DECnet,
         .rule_size      = sizeof(struct dn_fib_rule),
@@ -249,6 +255,7 @@ static struct fib_rules_ops dn_fib_rules_ops = {
         .compare        = dn_fib_rule_compare,
         .fill           = dn_fib_rule_fill,
         .default_pref   = dn_fib_rule_default_pref,
+        .flush_cache    = dn_fib_rule_flush_cache,
         .nlgroup        = RTNLGRP_DECnet_RULE,
         .policy         = dn_fib_rule_policy,
         .rules_list     = &dn_fib_rules,