tapsetup: add capability to add addresses to bridge

dist/tools/tapsetup/tapsetup

@@ -7,6 +7,7 @@ BRNAME="tapbr0"
 TAPNAME="tap"
 DEACTIVATE_IPV6=""
 ENABLE_FORWARDING=0
+DEFAULT_PREFIX_LEN=128
 UPLINK=""
 
 usage() {
@@ -21,6 +22,9 @@ usage() {
     echo "   -l <iface>, --list <iface>:   If <iface> belongs to a bridge, list the bridge and" >&2
     echo "                                 all interfaces that belong to it. If <iface> does " >&2
     echo"                                  not belong to a bridge, just print <iface>." >&2
+    echo "   -a <address>[/<prefix_len>], --address <address>[/<prefix_len>]:" >&2
+    echo "                                 Address to add to the created bridge. Can be used" >&2
+    echo "                                 multiple times." >&2
     echo "   -f, --forwarding              Enable forwarding system-wide on creation and " >&2
     echo "                                 disable on deletion." >&2
     echo "   -b <name>, --bridge <name>:   Give name for the bridge (default: tapbr)" >&2
@@ -63,6 +67,25 @@ activate_forwarding() {
     fi
 }
 
+add_ipv6_addrs() {
+    for a in ${BRIDGE_ADDRS}; do
+        address_addr=$(echo "${a}" | cut -d/ -f1)
+        prefix_len=$(echo "${a}" | cut -d/ -f2)
+        if [ "${a}" = "${prefix_len}" ]; then
+            # prefix length is not defined
+            prefix_len=${DEFAULT_PREFIX_LEN}
+        fi
+        case "${PLATFORM}" in
+            FreeBSD|OSX)
+                ifconfig ${BRNAME} inet6 ${address_addr} prefixlen ${prefix_len} || exit 1
+                ;;
+            Linux)
+                ip address add ${address_addr}/${prefix_len} dev ${BRNAME} || exit 1
+                ;;
+        esac
+    done
+}
+
 create_bridge() {
     echo "creating bridge ${BRNAME}"
 
@@ -116,6 +139,25 @@ deactivate_forwarding() {
     fi
 }
 
+del_ipv6_addrs() {
+    for a in ${BRIDGE_ADDRS}; do
+        address_addr=$(echo "${a}" | cut -d/ -f1)
+        prefix_len=$(echo "${a}" | cut -d/ -f2)
+        if [ "${a}" = "${prefix_len}" ]; then
+            # prefix length is not defined
+            prefix_len=${DEFAULT_PREFIX_LEN}
+        fi
+        case "${PLATFORM}" in
+            FreeBSD|OSX)
+                ifconfig ${BRNAME} inet6 ${address_addr} prefixlen ${prefix_len} delete || exit 1
+                ;;
+            Linux)
+                ip address delete ${address_addr}/${prefix_len} dev ${BRNAME} || exit 1
+                ;;
+        esac
+    done
+}
+
 delete_bridge() {
     echo "deleting ${BRNAME}"
 
@@ -231,6 +273,15 @@ while true ; do
         -6)
             DEACTIVATE_IPV6=1
             shift ;;
+        -a|--address)
+            # check if valid address + optional prefix length
+            if echo "$2" | grep -q "^[a-f0-9:]\+\(/[0-9]\+\)\?$"; then
+                BRIDGE_ADDRS="${BRIDGE_ADDRS} $2"
+                shift 2
+            else
+                usage
+                exit 2
+            fi ;;
         -b|--bridge)
             case "$2" in
                 "")
@@ -344,8 +395,10 @@ if [ "${COMMAND}" = 'create' ]; then
 
     activate_forwarding || exit 1
     up_bridge || exit 1
+    add_ipv6_addrs || exit 1
 
 elif [ "${COMMAND}" = 'delete' ]; then
+    del_ipv6_addrs || exit 1
     deactivate_forwarding || exit 1
     delete_bridge
 elif [ "${COMMAND}" = 'list' ]; then