1 files changed, 20 insertions, 3 deletions

diff --git a/networking/route.c b/networking/route.c
index 49d219ae0..59c756408 100644
--- a/networking/route.c
+++ b/networking/route.c
@@ -184,14 +184,33 @@ static void INET_setroute(int action, char **args)
 
         {
                 const char *target = *args++;
+                char *prefix;
 
+                /* recognize x.x.x.x/mask format. */
+                prefix = strchr(target, '/');
+                if(prefix) {
+                        int prefix_len;
+
+                        prefix_len = bb_xgetularg10_bnd(prefix+1, 0, 32);
+                        mask_in_addr(rt) = htonl( ~ (0xffffffffUL >> prefix_len));
+                        *prefix = '\0';
+#if HAVE_NEW_ADDRT
+                        rt.rt_genmask.sa_family = AF_INET;
+#endif
+                } else {
+                        /* Default netmask. */
+                        netmask = bb_INET_default;
+                }
                 /* Prefer hostname lookup is -host flag (xflag==1) was given. */
                 isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
                                                          (xflag & HOST_FLAG));
                 if (isnet < 0) {
                         bb_error_msg_and_die("resolving %s", target);
                 }
-
+                if(prefix) {
+                        /* do not destroy prefix for process args */
+                        *prefix = '/';
+                }
         }
 
         if (xflag) {            /* Reinit isnet if -net or -host was specified. */
@@ -201,8 +220,6 @@ static void INET_setroute(int action, char **args)
         /* Fill in the other fields. */
         rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST));
 
-        netmask = bb_INET_default;
-
         while (*args) {
                 int k = kw_lookup(tbl_ipvx, &args);
                 const char *args_m1 = args[-1];