path: root/net-scripts/net.modules.d/iproute2

#!/bin/bash
# Copyright (c) 2004-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

# Contributed by Roy Marples (uberlord@gentoo.org)

# Fix any potential localisation problems
# Note that LC_ALL trumps LC_anything_else according to locale(7)
ip() {
	LC_ALL=C /sbin/ip "$@"
}

iproute2_tunnel() {
	LC_ALL=C /sbin/ip tunnel "$@"
}

# void iproute2_depend(void)
#
# Sets up the dependancies for the module
iproute2_depend() {
	provide interface
	functions interface_device
	variables config routes fallback metric ipaddr ipaddr_fallback iproute inet6
}

# bool iproute2_check_installed(void)
#
# Returns 1 if iproute2 is installed, otherwise 0
iproute2_check_installed() {
	local report="${1:-false}" installed="0"
	if [[ ! -x /sbin/ip ]]; then
		installed="1"
		${report} && eerror "For iproute2 support, emerge sys-apps/iproute2"
	fi
	if [[ ! -e /proc/net/netlink ]]; then
		installed="1"
		${report} && eerror "iproute2 requires NetLink enabled in the kernel"
	fi
	return "${installed}"
}

# bool iproute2_exists(char *interface, bool report)
#
# Returns 1 if the interface exists, otherwise 0
iproute2_exists() {
	local e=$( ip addr show label "$1" ) report="${2:-false}"
	[[ -n ${e} ]] && return 0

	${report} && eerror "$1 does not exist"
	return 1
}

# void iproute2_up(char *interface)
#
# provides a generic interface for bringing interfaces up
iproute2_up() {
	ip link set up dev "$1"
}

# void iproute2_down(char *interface)
#
# provides a generic interface for bringing interfaces up
iproute2_down() {
	ip link set down dev "$1"
}

# bool ifproute2_is_up(char *iface, bool withaddress)
#
# Returns 0 if the interface is up, otherwise 1
# If withaddress is true then the interface has to have an IPv4 address
# assigned as well
iproute2_is_up() {
	local check="\<UP\>" addr="${2:-false}"
	${addr} && check="${check}.*inet "
	ip addr show "$1" | xargs | grep -Eq "${check}" && return 0
	return 1
}

# void iproute2_set_flag(char *iface, char *flag, bool enabled)
#
# Sets or disables the interface flag 
iproute2_set_flag() {
	local enable="$3" opt="on"
	${enable} || opt="off"
	ip link set "$1" "$2" "${opt}"
}

# void iproute2_get_address(char *interface)
#
# Fetch the address retrieved by DHCP.  If successful, echoes the
# address on stdout, otherwise echoes nothing.
iproute2_get_address() {
	ip -family inet addr show "$1" \
	| sed -n -e 's/.*inet \([^ ]*\).*/\1/p'
}

# void iproute2_get_mac_address(char *interface)
#
# Fetch the mac address assingned to the network card
iproute2_get_mac_address() {
	local mac=$( ip link show "$1" | sed -n -e \
		's/^.*\<\(..:..:..:..:..:..\)\>.*/\U\1/p' )
	[[ ${mac} != '00:00:00:00:00:00' \
	&& ${mac} != '44:44:44:44:44:44' \
	&& ${mac} != 'FF:FF:FF:FF:FF:FF' ]] \
		&& echo "${mac}"
}

# void iproute2_set_mac_address(char *interface, char *mac)
#
# Assigned the mac address to the network card
iproute2_set_mac_address() {
	ip link set address "$2" dev "$1"
}

# int iproute2_set_name(char *interface, char *new_name)
#
# Renames the interface
# This will not work if the interface is setup!
iproute2_set_name() {
	ip link set name "$2" dev "$1"
}

# void iproute2_get_aliases_rev(char *interface)
#
# Fetch the list of aliases for an interface.  
# Outputs a space-separated list on stdout, in reverse order, for
# example "eth0:2 eth0:1"
iproute2_get_aliases_rev() {
	local iface=$( interface_device "$1" )
	ip addr show dev "${iface}" | grep -o "${iface}:[0-9].*" | tac
}

# bool iproute2_del_addresses(char *interface, bool onlyinet)
#
# Remove addresses from interface.
# If onlyinet is true, then we only remove IPv4 / inet addresses.
iproute2_del_addresses() {
	local pre=""
	${2:-false} && pre="-f inet"
	ip ${pre} addr flush label "$1" scope global &>/dev/null
	ip ${pre} addr flush label "$1" scope host &>/dev/null
	return 0
}

# bool iproute2_get_old_config(char *iface)
#
# Returns config and config_fallback for the given interface
iproute2_get_old_config() {
	local ifvar=$( bash_variable "$1" ) inet6 t

	# iproute2-style config vars
	t="ipaddr_${ifvar}[@]"
	config=( "${!t}" )
	t="config_fallback_${ifvar}[@]"
	config_fallback=( "${!t}" )
	t="inet6_${ifvar}[@]"
	inet6=( "${!t}" )

	# BACKWARD COMPATIBILITY: check for space-separated inet6 addresses
	[[ ${#inet6[@]} == "1" && ${inet6} == *" "* ]] && inet6=( ${inet6} )

	# Add inet6 addresses to our config if required
	[[ -n ${inet6} ]] && config=( "${config[@]}" "${inet6[@]}" )

	# Support old style iface_xxx syntax
	if [[ -z ${config} ]] ; then
		if is_function ifconfig_get_old_config ; then
			ifconfig_get_old_config "${iface}"
		fi
	fi

	return 0
}

# bool iproute2_iface_stop(char *interface)
#
# Do final shutdown for an interface or alias.
#
# Returns 0 (true) when successful, non-zero (false) on failure
iproute2_iface_stop() {
	local label="$1" iface=$( interface_device "$1" )

	# Shut down the link if this isn't an alias or vlan
	if [[ ${label} == "${iface}" ]]; then
		iproute2_down "${iface}"
		return $?
	fi
	return 0
}

# bool iproute2_add_address(char *interface, char *options ...)
#
# Adds an the specified address to the interface
# returns 0 on success and non-zero on failure
iproute2_add_address() {
	local iface="$1" x

	iproute2_exists "${iface}" true || return 1

	# Extract the config
	local -a config=( "$@" )
	config=( ${config[@]:1} )

	# Convert an ifconfig line to iproute2
	local n="${#config[@]}"
	for (( x=0; x<n; x++ )); do
		case "${config[x]}" in
			netmask)
				config[0]="${config[0]}/$( netmask2cidr ${config[x+1]} )"
				unset config[x] config[x+1]
				;;
			mtu)
				ip link set mtu "${config[x+1]}" dev "${iface}"
				unset config[x] config[x+1]
				;;
		esac
	done
	config=( "${config[@]//pointopoint/peer}" )

	# Always scope lo addresses as host unless specified otherwise
	[[ ${iface} == "lo" && " ${config[@]} " != *" scope "* ]] \
	&& config=( "${config[@]}" "scope host" )

	# IPv4 specifics
	if [[ ${config[@]} == *.*.*.* ]]; then
		# Work out a broadcast if none supplied
		[[ ${config[@]} != *" brd "* && ${config[@]} != *" broadcast "* ]] \
			&& config=( "${config[@]}" "brd +" )
	fi

	# Ensure that the interface is up so we can add IPv6 addresses
	interface_up "${iface}"

	# Some kernels like to apply lo with an address when they are brought up
	if [[ ${iface} == "lo" \
		&& ${config[@]} == "127.0.0.1/8 brd 127.255.255.255 scope host" ]]; then
		ip addr del dev "${iface}" 127.0.0.1/8 2>/dev/null
	fi

	ip addr add dev "${iface}" ${config[@]}
	local r="$?"
	[[ ${r} != "0" ]] && return "${r}"

	local metric ifvar=$( bash_variable "${iface}" )
	# Remove the newly added route and replace with our metric
	metric="metric_${ifvar}"
	[[ ${!metric} == "0" || ${RC_AUTO_INTERFACE} != "yes" ]] && return "${r}"

	local network=$( ip_network "${config[0]}" )
	[[ -z ${network} ]] && return "${r}"

	local cidr="${config[0]##*/}"
	if ip route del "${network}/${cidr}" metric 0 dev "${iface}" \
		2>/dev/null ; then
		ip route add "${network}/${cidr}" metric "${!metric}" dev "${iface}"
	fi

	return "${r}"
}

# bool iproute2_pre_start(char *interface)
#
# Runs any pre_start stuff on our interface - just the MTU atm
# We set MTU twice as it may be needed for DHCP - a dhcp client could
# change it in error, so we set MTU in post start too
iproute2_pre_start() {
	local iface="$1"

	interface_exists "${iface}" || return 0

	local ifvar=$( bash_variable "$1" ) mtu

	# MTU support
	mtu="mtu_${ifvar}"
	[[ -n ${!mtu} ]] && ip link set mtu "${!mtu}" dev "${iface}"

	return 0
}

# bool iproute2_post_start(char *interface)
#
# Runs any post_start stuff on our interface and adds routes
# Always returns 0
iproute2_post_start() {
	local iface="$1" ifvar=$( bash_variable "$1" ) routes metric mtu x netmask

	iproute2_exists "${iface}" || return 0
	
	# Make sure interface is marked UP
	iproute2_up "${iface}"

	# MTU support
	mtu="mtu_${ifvar}"
	[[ -n ${!mtu} ]] && ip link set mtu "${!mtu}" dev "${iface}"

	x="routes_${ifvar}[@]"
	routes=( "${!x}" )
	metric="metric_${ifvar}"

	# Test for old style ipaddr variable
	if [[ -z ${routes} ]]; then
		t="iproute_${ifvar}[@]"
		routes=( "${!t}" )
	fi

	[[ -z ${routes} ]] && return 0

	# Set routes with ip route -- this might also include default route
	einfo "Adding routes"
	eindent
	for x in "${routes[@]}"; do
		ebegin "${x}"

		# Support net-tools routing too
		x="${x//gw/via}"
		x="${x//-A inet6/}"
		x="${x//-net/}"
		[[ " ${x} " == *" -host "* ]] && x="${x//-host/} scope host"

		# Attempt to support net-tools route netmask option
		netmask="${x##* netmask }"
		if [[ -n ${netmask} && ${x} != "${netmask}" ]]; then
			netmask="${netmask%% *}"
			x="${x// netmask ${netmask} / }"
			local -a a=( ${x} )
			a[0]="${a[0]}/$( netmask2cidr ${netmask} )"
			x="${a[@]}"
		fi

		# Add a metric if we don't have one
		[[ " ${x} " != *" metric "* ]] && x="${x} metric ${!metric}"

		ip route append ${x} dev "${iface}"
		eend $?
	done
	eoutdent

	return 0
}

# void iproute2_route_metric(char* interface, int metric)
#
# Change all routes for an interface to a given metric
iproute2_route_metric() {
	local route
	ip route | grep " dev $1" | {
		while read route ; do
			ip route del ${route}
			ip route add ${route} metric "$2"
		done
	}
}

# void iproute2_default_route(char* interface, char* gateway_ip, int metric)
#
# Force default route to the specified gateway, optionally on
# the given interface
iproute2_default_route() {
	local metric="${3:-0}"

	ip route change default via "$2" metric "${metric}" dev "$1" 2>/dev/null \
	|| ip route append default via "$2" metric "${metric}" dev "$1" 2>/dev/null
}

# vim:ts=4