+#!/bin/sh
+# Copyright (C) 2006 OpenWrt.org
+
+# DEBUG="echo"
+
+do_sysctl() {
+ [ -n "$2" ] && \
+ sysctl -n -e -w "$1=$2" >/dev/null || \
+ sysctl -n -e "$1"
+}
+
+map_sysctls() {
+ local cfg="$1"
+ local ifn="$2"
+
+ local fam
+ for fam in ipv4 ipv6; do
+ if [ -d /proc/sys/net/$fam ]; then
+ local key
+ for key in /proc/sys/net/$fam/*/$ifn/*; do
+ local val
+ config_get val "$cfg" "${fam}_${key##*/}"
+ [ -n "$val" ] && echo -n "$val" > "$key"
+ done
+ fi
+ done
+}
+
+find_config() {
+ local iftype device iface ifaces ifn
+ for ifn in $interfaces; do
+ config_get iftype "$ifn" type
+ config_get iface "$ifn" ifname
+ case "$iftype" in
+ bridge) config_get ifaces "$ifn" ifnames;;
+ esac
+ config_get device "$ifn" device
+ for ifc in $device $iface $ifaces; do
+ [ ."$ifc" = ."$1" ] && {
+ echo "$ifn"
+ return 0
+ }
+ done
+ done
+
+ return 1;
+}
+
+scan_interfaces() {
+ local cfgfile="${1:-network}"
+ interfaces=
+ config_cb() {
+ case "$1" in
+ interface)
+ config_set "$2" auto 1
+ ;;
+ esac
+ local iftype ifname device proto
+ config_get iftype "$CONFIG_SECTION" TYPE
+ case "$iftype" in
+ interface)
+ append interfaces "$CONFIG_SECTION"
+ config_get proto "$CONFIG_SECTION" proto
+ config_get iftype "$CONFIG_SECTION" type
+ config_get ifname "$CONFIG_SECTION" ifname
+ config_get device "$CONFIG_SECTION" device "$ifname"
+ config_set "$CONFIG_SECTION" device "$device"
+ case "$iftype" in
+ bridge)
+ config_set "$CONFIG_SECTION" ifnames "$device"
+ config_set "$CONFIG_SECTION" ifname br-"$CONFIG_SECTION"
+ ;;
+ esac
+ ( type "scan_$proto" ) >/dev/null 2>/dev/null && eval "scan_$proto '$CONFIG_SECTION'"
+ ;;
+ esac
+ }
+ config_load "${cfgfile}"
+}
+
+add_vlan() {
+ local vif="${1%\.*}"
+
+ [ "$1" = "$vif" ] || ifconfig "$1" >/dev/null 2>/dev/null || {
+ ifconfig "$vif" up 2>/dev/null >/dev/null || add_vlan "$vif"
+ $DEBUG vconfig add "$vif" "${1##*\.}"
+ return 0
+ }
+ return 1
+}
+
+# add dns entries if they are not in resolv.conf yet
+add_dns() {
+ local cfg="$1"; shift
+
+ remove_dns "$cfg"
+
+ # We may be called by pppd's ip-up which has a nonstandard umask set.
+ # Create an empty file here and force its permission to 0644, otherwise
+ # dnsmasq will not be able to re-read the resolv.conf.auto .
+ [ ! -f /tmp/resolv.conf.auto ] && {
+ touch /tmp/resolv.conf.auto
+ chmod 0644 /tmp/resolv.conf.auto
+ }
+
+ local dns
+ local add
+ for dns in "$@"; do
+ grep -qsE "^nameserver ${dns//./\\.}$" /tmp/resolv.conf.auto || {
+ add="${add:+$add }$dns"
+ echo "nameserver $dns" >> /tmp/resolv.conf.auto
+ }
+ done
+
+ [ -n "$cfg" ] && {
+ uci_toggle_state network "$cfg" dns "$add"
+ uci_toggle_state network "$cfg" resolv_dns "$add"
+ }
+}
+
+# remove dns entries of the given iface
+remove_dns() {
+ local cfg="$1"
+
+ [ -n "$cfg" ] && {
+ [ -f /tmp/resolv.conf.auto ] && {
+ local dns=$(uci_get_state network "$cfg" resolv_dns)
+ for dns in $dns; do
+ sed -i -e "/^nameserver ${dns//./\\.}$/d" /tmp/resolv.conf.auto
+ done
+ }
+
+ uci_revert_state network "$cfg" dns
+ uci_revert_state network "$cfg" resolv_dns
+ }
+}
+
+# sort the device list, drop duplicates
+sort_list() {
+ local arg="$*"
+ (
+ for item in $arg; do
+ echo "$item"
+ done
+ ) | sort -u
+}
+
+# Create the interface, if necessary.
+# Return status 0 indicates that the setup_interface() call should continue
+# Return status 1 means that everything is set up already.
+
+prepare_interface() {
+ local iface="$1"
+ local config="$2"
+ local macaddr="$3"
+
+ # if we're called for the bridge interface itself, don't bother trying
+ # to create any interfaces here. The scripts have already done that, otherwise
+ # the bridge interface wouldn't exist.
+ [ "br-$config" = "$iface" -o -e "$iface" ] && return 0;
+
+ ifconfig "$iface" 2>/dev/null >/dev/null && {
+ local proto
+ config_get proto "$config" proto
+
+ # make sure the interface is removed from any existing bridge and deconfigured,
+ # (deconfigured only if the interface is not set to proto=none)
+ unbridge "$iface"
+
+ local mtu macaddr txqueuelen
+ config_get mtu "$config" mtu
+ [ -n "$macaddr" ] || config_get macaddr "$config" macaddr
+ config_get txqueuelen "$config" txqueuelen
+ [ -n "$macaddr" ] && $DEBUG ifconfig "$iface" down
+ $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} ${txqueuelen:+txqueuelen $txqueuelen} up
+
+ [ "$proto" = none ] || ifconfig "$iface" 0.0.0.0
+
+ # Apply sysctl settings
+ map_sysctls "$config" "$iface"
+ }
+
+ # Setup VLAN interfaces
+ add_vlan "$iface" && return 1
+ ifconfig "$iface" 2>/dev/null >/dev/null || return 0
+
+ # Setup bridging
+ local iftype
+ config_get iftype "$config" type
+ case "$iftype" in
+ bridge)
+ local macaddr
+ config_get macaddr "$config" macaddr
+ [ -x /usr/sbin/brctl ] && {
+ ifconfig "br-$config" 2>/dev/null >/dev/null && {
+ local newdevs devices
+ config_get devices "$config" device
+ for dev in $(sort_list "$devices" "$iface"); do
+ append newdevs "$dev"
+ done
+ uci_toggle_state network "$config" device "$newdevs"
+ $DEBUG ifconfig "$iface" 0.0.0.0
+ $DEBUG do_sysctl "net.ipv6.conf.$iface.disable_ipv6" 1
+ $DEBUG brctl addif "br-$config" "$iface"
+ # Bridge existed already. No further processing necesary
+ } || {
+ local stp igmp_snooping
+ config_get_bool stp "$config" stp 0
+ config_get_bool igmp_snooping "$config" igmp_snooping 1
+ $DEBUG brctl addbr "br-$config"
+ $DEBUG brctl setfd "br-$config" 0
+ $DEBUG ifconfig "$iface" 0.0.0.0
+ $DEBUG do_sysctl "net.ipv6.conf.$iface.disable_ipv6" 1
+ $DEBUG brctl addif "br-$config" "$iface"
+ $DEBUG brctl stp "br-$config" $stp
+ [ -z "$macaddr" ] && macaddr="$(cat /sys/class/net/$iface/address)"
+ echo $igmp_snooping > /sys/devices/virtual/net/br-$config/bridge/multicast_snooping 2>/dev/null
+ $DEBUG ifconfig "br-$config" hw ether $macaddr up
+ # Creating the bridge here will have triggered a hotplug event, which will
+ # result in another setup_interface() call, so we simply stop processing
+ # the current event at this point.
+ }
+ ifconfig "$iface" ${macaddr:+hw ether "${macaddr}"} up 2>/dev/null >/dev/null
+ return 1
+ }
+ ;;
+ esac
+ return 0
+}
+
+set_interface_ifname() {
+ local config="$1"
+ local ifname="$2"
+
+ local device
+ config_get device "$1" device
+ uci_toggle_state network "$config" ifname "$ifname"
+ uci_toggle_state network "$config" device "$device"
+}
+
+setup_interface_none() {
+ env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
+}
+
+setup_interface_static() {
+ local iface="$1"
+ local config="$2"
+
+ local ipaddr netmask ip6addr
+ config_get ipaddr "$config" ipaddr
+ config_get netmask "$config" netmask
+ config_get ip6addr "$config" ip6addr
+ [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
+
+ local gateway ip6gw dns bcast metric
+ config_get gateway "$config" gateway
+ config_get ip6gw "$config" ip6gw
+ config_get dns "$config" dns
+ config_get bcast "$config" broadcast
+ config_get metric "$config" metric
+
+ case "$ip6addr" in
+ */*) ;;
+ *:*) ip6addr="$ip6addr/64" ;;
+ esac
+
+ [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
+ [ -z "$ip6addr" ] || $DEBUG ifconfig "${iface%:*}" add "$ip6addr"
+ [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" ${metric:+metric $metric} dev "$iface"
+ [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" ${metric:+metric $metric} dev "${iface%:*}"
+ [ -z "$dns" ] || add_dns "$config" $dns
+
+ config_get type "$config" TYPE
+ [ "$type" = "alias" ] && return 0
+
+ env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
+}
+
+setup_interface_alias() {
+ local config="$1"
+ local parent="$2"
+ local iface="$3"
+
+ local cfg
+ config_get cfg "$config" interface
+ [ "$parent" == "$cfg" ] || return 0
+
+ # parent device and ifname
+ local p_device p_type
+ config_get p_device "$cfg" device
+ config_get p_type "$cfg" type
+
+ # select alias ifname
+ local layer use_iface
+ config_get layer "$config" layer 2
+ case "$layer:$p_type" in
+ # layer 3: e.g. pppoe-wan or pptp-vpn
+ 3:*) use_iface="$iface" ;;
+
+ # layer 2 and parent is bridge: e.g. br-wan
+ 2:bridge) use_iface="br-$cfg" ;;
+
+ # layer 1: e.g. eth0 or ath0
+ *) use_iface="$p_device" ;;
+ esac
+
+ # alias counter
+ local ctr
+ config_get ctr "$parent" alias_count 0
+ ctr="$(($ctr + 1))"
+ config_set "$parent" alias_count "$ctr"
+
+ # alias list
+ local list
+ config_get list "$parent" aliases
+ append list "$config"
+ config_set "$parent" aliases "$list"
+
+ use_iface="$use_iface:$ctr"
+ set_interface_ifname "$config" "$use_iface"
+
+ local proto
+ config_get proto "$config" proto "static"
+ case "${proto}" in
+ static)
+ setup_interface_static "$use_iface" "$config"
+ ;;
+ *)
+ echo "Unsupported type '$proto' for alias config '$config'"
+ return 1
+ ;;
+ esac
+}
+
+setup_interface() {
+ local iface="$1"
+ local config="$2"
+ local proto="$3"
+ local vifmac="$4"
+
+ [ -n "$config" ] || {
+ config=$(find_config "$iface")
+ [ "$?" = 0 ] || return 1
+ }
+
+ prepare_interface "$iface" "$config" "$vifmac" || return 0
+
+ [ "$iface" = "br-$config" ] && {
+ # need to bring up the bridge and wait a second for
+ # it to switch to the 'forwarding' state, otherwise
+ # it will lose its routes...
+ ifconfig "$iface" up
+ sleep 1
+ }
+
+ # Interface settings
+ set_interface_ifname "$config" "$iface"
+
+ [ -n "$proto" ] || config_get proto "$config" proto
+ case "$proto" in
+ static)
+ setup_interface_static "$iface" "$config"
+ ;;
+ dhcp)
+ # kill running udhcpc instance
+ local pidfile="/var/run/dhcp-${iface}.pid"
+ service_kill udhcpc "$pidfile"
+
+ local ipaddr netmask hostname proto1 clientid vendorid broadcast reqopts
+ config_get ipaddr "$config" ipaddr
+ config_get netmask "$config" netmask
+ config_get hostname "$config" hostname
+ config_get proto1 "$config" proto
+ config_get clientid "$config" clientid
+ config_get vendorid "$config" vendorid
+ config_get_bool broadcast "$config" broadcast 0
+ config_get reqopts "$config" reqopts
+
+ [ -z "$ipaddr" ] || \
+ $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
+
+ # additional request options
+ local opt dhcpopts
+ for opt in $reqopts; do
+ append dhcpopts "-O $opt"
+ done
+
+ # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
+ [ "$proto1" != "$proto" ] && append dhcpopts "-n -q" || append dhcpopts "-O rootpath -R &"
+ [ "$broadcast" = 1 ] && broadcast="-O broadcast" || broadcast=
+
+ $DEBUG eval udhcpc -t 0 -i "$iface" \
+ ${ipaddr:+-r $ipaddr} \
+ ${hostname:+-H $hostname} \
+ ${clientid:+-c $clientid} \
+ ${vendorid:+-V $vendorid} \
+ -b -p "$pidfile" $broadcast \
+ ${dhcpopts}
+ ;;
+ none)
+ setup_interface_none "$iface" "$config"
+ ;;
+ *)
+ if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
+ eval "setup_interface_$proto '$iface' '$config' '$proto'"
+ else
+ echo "Interface type $proto not supported."
+ return 1
+ fi
+ ;;
+ esac
+}
+
+stop_interface_dhcp() {
+ local config="$1"
+
+ local ifname
+ config_get ifname "$config" ifname
+
+ local lock="/var/lock/dhcp-${ifname}"
+ [ -f "$lock" ] && lock -u "$lock"
+
+ remove_dns "$config"
+
+ local pidfile="/var/run/dhcp-${ifname}.pid"
+ service_kill udhcpc "$pidfile"
+
+ uci -P /var/state revert "network.$config"
+}
+
+unbridge() {
+ local dev="$1"
+ local brdev
+
+ [ -x /usr/sbin/brctl ] || return 0
+ brctl show 2>/dev/null | grep "$dev" >/dev/null && {
+ # interface is still part of a bridge, correct that
+
+ for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
+ brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
+ do_sysctl "net.ipv6.conf.$dev.disable_ipv6" 0
+ done
+ }
+}
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