ifupdown: support metric for static default gw

This is useful when you have multiple ISPs with failover. It allows
setting the priority of the static gateway and makes it possible
to specify multiple static gateways.

The ubuntu ifupdown supports it.

function                                             old     new   delta
.rodata                                           116725  116797     +72
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 72/0)               Total: 72 bytes
   text    data     bss     dec     hex filename
 953343    7313    8984  969640   ecba8 busybox_old
 953415    7313    8984  969712   ecbf0 busybox_unstripped

Signed-off-by: Natanael Copa <natanael.copa@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index 73da26085..dfda20670 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -403,11 +403,11 @@ static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
         result = execute("ip addr add %address%/%netmask% dev %iface%[[ label %label%]]", ifd, exec);
         result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
         /* Was: "[[ ip ....%gateway% ]]". Removed extra spaces w/o checking */
-        result += execute("[[ip route add ::/0 via %gateway%]]", ifd, exec);
+        result += execute("[[ip route add ::/0 via %gateway%]][[ prio %metric%]]", ifd, exec);
 # else
         result = execute("ifconfig %iface%[[ media %media%]][[ hw %hwaddress%]][[ mtu %mtu%]] up", ifd, exec);
         result += execute("ifconfig %iface% add %address%/%netmask%", ifd, exec);
-        result += execute("[[route -A inet6 add ::/0 gw %gateway%]]", ifd, exec);
+        result += execute("[[route -A inet6 add ::/0 gw %gateway%[[ metric %metric%]]]]", ifd, exec);
 # endif
         return ((result == 3) ? 3 : 0);
 }
@@ -490,7 +490,7 @@ static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
         result = execute("ip addr add %address%/%bnmask%[[ broadcast %broadcast%]] "
                         "dev %iface%[[ peer %pointopoint%]][[ label %label%]]", ifd, exec);
         result += execute("ip link set[[ mtu %mtu%]][[ addr %hwaddress%]] %iface% up", ifd, exec);
-        result += execute("[[ip route add default via %gateway% dev %iface%]]", ifd, exec);
+        result += execute("[[ip route add default via %gateway% dev %iface%[[ prio %metric%]]]]", ifd, exec);
         return ((result == 3) ? 3 : 0);
 # else
         /* ifconfig said to set iface up before it processes hw %hwaddress%,
@@ -500,7 +500,7 @@ static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
         result += execute("ifconfig %iface% %address% netmask %netmask%"
                                 "[[ broadcast %broadcast%]][[ pointopoint %pointopoint%]] ",
                                 ifd, exec);
-        result += execute("[[route add default gw %gateway% %iface%]]", ifd, exec);
+        result += execute("[[route add default gw %gateway%[[ metric %metric%]] %iface%]]", ifd, exec);
         return ((result == 3) ? 3 : 0);
 # endif
 }