system: fix treatment of RT_TABLE_MAIN

Do not treat RT_TABLE_MAIN as RT_TABLE_UNSPEC in system_resolve_rt_table() in
order to allow ip rules with lookup main to work as expected.

Provide a new function system_is_default_rt_table() to allow calling code to
specifically test for RT_TABLE_MAIN, this is going to be needed for the
backwards compatible handling of the table attribute in route objects.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/system.h b/system.h
index 4c80eb0..0fde7f1 100644
--- a/system.h
+++ b/system.h
@@ -130,6 +130,7 @@ int system_flush_routes(void);
 
 bool system_resolve_rt_type(const char *type, unsigned int *id);
 bool system_resolve_rt_table(const char *name, unsigned int *id);
+bool system_is_default_rt_table(unsigned int id);
 
 int system_del_ip_tunnel(const char *name);
 int system_add_ip_tunnel(const char *name, struct blob_attr *attr);