netifd: Add configurable DHCP release behavior

Make sending a DHCP release configurable when the client exits allowing to clean up
IP/mac state info in intermediate devices.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@49332 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh b/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
index 546e1d6..7f4af25 100755 (executable)
--- a/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
+++ b/package/network/config/netifd/files/lib/netifd/proto/dhcp.sh
@@ -12,6 +12,7 @@ proto_dhcp_init_config() {
        proto_config_add_string clientid
        proto_config_add_string vendorid
        proto_config_add_boolean 'broadcast:bool'
+       proto_config_add_boolean 'release:bool'
        proto_config_add_string 'reqopts:list(string)'
        proto_config_add_string iface6rd
        proto_config_add_string sendopts
@@ -26,8 +27,8 @@ proto_dhcp_setup() {
        local config="$1"
        local iface="$2"
 
-       local ipaddr hostname clientid vendorid broadcast reqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes
-       json_get_vars ipaddr hostname clientid vendorid broadcast reqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes
+       local ipaddr hostname clientid vendorid broadcast release reqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes
+       json_get_vars ipaddr hostname clientid vendorid broadcast release reqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes
 
        local opt dhcpopts
        for opt in $reqopts; do
@@ -39,6 +40,7 @@ proto_dhcp_setup() {
        done
 
        [ "$broadcast" = 1 ] && broadcast="-B" || broadcast=
+       [ "$release" = 1 ] && release="-R" || release=
        [ -n "$clientid" ] && clientid="-x 0x3d:${clientid//:/}" || clientid="-C"
        [ -n "$iface6rd" ] && proto_export "IFACE6RD=$iface6rd"
        [ "$iface6rd" != 0 -a -f /lib/netifd/proto/6rd.sh ] && append dhcpopts "-O 212"
@@ -56,7 +58,7 @@ proto_dhcp_setup() {
                ${ipaddr:+-r $ipaddr} \
                ${hostname:+-H $hostname} \
                ${vendorid:+-V $vendorid} \
-               $clientid $broadcast $dhcpopts
+               $clientid $broadcast $release $dhcpopts
 }
 
 proto_dhcp_renew() {