kernel-netlink: Ignore unusable routes

diff --git a/src/libhydra/plugins/kernel_netlink/kernel_netlink_net.c b/src/libhydra/plugins/kernel_netlink/kernel_netlink_net.c
index a431e49b70be56030860b0ecb8ce659ebf15ce9e..1515b01ccd941da9670ed9b2fa445718853b6e4b 100644 (file)
--- a/src/libhydra/plugins/kernel_netlink/kernel_netlink_net.c
+++ b/src/libhydra/plugins/kernel_netlink/kernel_netlink_net.c
@@ -1550,6 +1550,26 @@ static void rt_entry_destroy(rt_entry_t *this)
        free(this);
 }
 
+/**
+ * Check if the route received with RTM_NEWROUTE is usable based on its type.
+ */
+static bool route_usable(struct nlmsghdr *hdr)
+{
+       struct rtmsg *msg;
+
+       msg = NLMSG_DATA(hdr);
+       switch (msg->rtm_type)
+       {
+               case RTN_BLACKHOLE:
+               case RTN_UNREACHABLE:
+               case RTN_PROHIBIT:
+               case RTN_THROW:
+                       return FALSE;
+               default:
+                       return TRUE;
+       }
+}
+
 /**
  * Parse route received with RTM_NEWROUTE. The given rt_entry_t object will be
  * reused if not NULL.
@@ -1700,6 +1720,10 @@ static host_t *get_route(private_kernel_netlink_net_t *this, host_t *dest,
                                rt_entry_t *other;
                                uintptr_t table;
 
+                               if (!route_usable(current))
+                               {
+                                       continue;
+                               }
                                route = parse_route(current, route);
 
                                table = (uintptr_t)route->table;