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# Copyright (c) 2018
# Released under the 2-clause BSD license.
# shellcheck shell=sh disable=SC1008
veth_depend()
{
program ip
}
_config_vars="$_config_vars veth"
# We need it because _exists() function seeks in /sys/class/net
_netns_exists()
{
[ -e "/var/run/netns/$1" ]
}
#Creates the network namespace if it doesn't exist. If called with no arguments, does nothing
#Arguments:
# $1 - name of the namespace
_create_ns() {
vethrc=0
for _ns in "$@"; do
if [ -z "$_ns" ]; then
continue
fi
if ! _netns_exists "$_ns"; then
ip netns add "$_ns" > /dev/null 2>&1
vethrc=$(($?+ vethrc))
fi
done
return $vethrc
}
#Brings a virtual interface up and takes network namespaces into account
#Arguments:
# $1 - name of the interface, required!
# $2 - namespace
_bring_peer_up()
{
if [ ! -z "$2" ]; then
ip link set "$1" netns "$2" > /dev/null 2>&1
vethrc=$?
ip netns exec "$2" ip link set dev "$1" up > /dev/null 2>&1
vethrc=$(($?+ vethrc))
return $vethrc
fi
ip link set dev "$1" up > /dev/null 2>&1
return $?
}
#Brings a virtual interface down and takes network namespaces into account
#Arguments:
# $1 - name of the interface, required!
# $2 - namespace
_bring_peer_down()
{
if [ ! -z "$2" ]; then
ip netns exec "$2" ip link del dev "$1" > /dev/null 2>&1
return $?
fi
ip link del dev "$1" > /dev/null 2>&1
return $?
}
#Create and bring the veth pair up
_create_peers()
{
local peer1
peer1="$(_get_array "veth_${IFVAR}_peer1")"
local peer2
peer2="$(_get_array "veth_${IFVAR}_peer2")"
for x in $peer1 $peer2; do
if _exists "$x" ; then
eerror "Interface $x already exists. Can't continue"
return 1
fi
done
local netns1
netns1="$(_get_array "veth_${IFVAR}_ns1")"
local netns2
netns2="$(_get_array "veth_${IFVAR}_ns2")"
local vethrc
if ! _create_ns "$netns1" "$netns2"
then
eerror "Can't create namespaces: $netns1 $netns2"
return 1
fi
ip link add "$peer1" type veth peer name "$peer2" > /dev/null 2>&1 || {
eerror "Can't create veth peer $peer1 or $peer2"
return 1
}
if ! _bring_peer_up "$peer1" "$netns1"
then
eerror "Can't bring the veth peer $peer1 up"
return 1
fi
if ! _bring_peer_up "$peer2" "$netns2"
then
eerror "Can't bring the veth peer $peer2 up"
return 1
fi
return 0
}
# Create peers and namespaces
veth_pre_start()
{
local itype
eval itype=\$type_${IFVAR}
if [ "$itype" != "veth" ]; then
return 0
fi
local createveth
eval createveth=\$veth_${IFVAR}_create
if [ "$createveth" = "no" ]; then
return 0
fi
type ip >/dev/null 2>&1 || {
eerror "iproute2 nor found, please install iproute2"
return 1
}
if ! _create_peers
then
return 1
fi
return 0
}
#Delete the veth pair
#We don't delete namespaces because someone may use them for some purposes
veth_post_stop()
{
local itype
eval itype=\$type_${IFVAR}
if [ "$itype" != "veth" ]; then
return 0
fi
local createveth
eval createveth=\$veth_${IFVAR}_create
if [ "$createveth" == "no" ]; then
return 0
fi
local peer1
peer1="$(_get_array "veth_${IFVAR}_peer1")"
local netns1
netns1="$(_get_array "veth_${IFVAR}_ns1")"
if ! _bring_peer_down "$peer1" "$netns1"
then
eerror "Can't delete the veth pair ${IFVAR}"
eend 1
fi
return 0
}
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