openwrtv4/package/base-files/files/lib/network/config.sh

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#!/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 -qsF "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 vifmac="$3"
# if we're called for the bridge interface itself, don't bother trying
# to create any interfaces here. The scripts have already done that, otherwise
# the bridge interface wouldn't exist.
[ "br-$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 "$iface"
[ "$proto" = none ] || ifconfig "$iface" 0.0.0.0
# Change interface MAC address if requested
[ -n "$vifmac" ] && {
ifconfig "$iface" down
ifconfig "$iface" hw ether "$vifmac" up
}
# Apply sysctl settings
map_sysctls "$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" "$iface"
# Bridge existed already. No further processing necesary
} || {
local stp
config_get_bool stp "$config" stp 0
$DEBUG brctl addbr "br-$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)"
$DEBUG ifconfig "br-$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 "$iface" up
sleep 1
}
# Interface settings
grep -qE "^ *$iface:" /proc/net/dev && {
local mtu macaddr txqueuelen
config_get mtu "$config" mtu
config_get macaddr "$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 $txqueuelen} up
}
set_interface_ifname "$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
}
}