commit: 963d378276193c9ae73b889da03960258773d259
Author: Kirill Semenkov <semenkovk <AT> gmail <DOT> com>
AuthorDate: Mon Dec 17 09:07:18 2018 +0000
Commit: Robin H. Johnson <robbat2 <AT> gentoo <DOT> org>
CommitDate: Sun Apr 21 04:10:41 2019 +0000
URL: https://gitweb.gentoo.org/proj/netifrc.git/commit/?id=963d3782
Veth support added
Signed-off-by: Robin H. Johnson <robbat2 <AT> gentoo.org>
net/veth.sh | 193 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 193 insertions(+)
diff --git a/net/veth.sh b/net/veth.sh
new file mode 100644
index 0000000..d969a14
--- /dev/null
+++ b/net/veth.sh
@@ -0,0 +1,193 @@
+# Copyright (c) 2018
+# Released under the 2-clause BSD license.
+
+veth_depend()
+{
+ program ip awk
+}
+
+_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 $?
+}
+
+
+#Create and bring the veth pair up
+_create_peers()
+{
+ local peers
+ peers="$(_get_array "veth_${IFVAR}")"
+
+ # veth has exactly two peers.
+ # For POSIX compatibility we evade bash arrays
+ local npeers
+ npeers=$(echo "$peers" | awk '{print NF}')
+ if [ "$npeers" != 2 ]; then
+ eerror "veth interface must have exactly two peers"
+ return 1
+ fi
+
+ for x in ${peers}; do
+ if _exists "$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 $netns2"
+ return 1
+ fi
+
+ local peer1
+ peer1=$(echo "$peers" | awk '{print $1}')
+ local peer2
+ peer2=$(echo "$peers" | awk '{print $2}')
+
+
+ ip link add "$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 [ "$createveth" == "no" ]; then
+ return 0
+ fi
+
+ local peers
+ peers="$(_get_array "veth_${IFVAR}")"
+ local first
+ first=$(echo "$peers" | awk '{print $1}')
+ local netns1
+ netns1="$(_get_array "veth_${IFVAR}_ns1")"
+
+ if ! _bring_peer_down "$first" "$netns1"
+ then
+ eerror "Can't delete the veth pair ${IFVAR}"
+ eend 1
+ fi
+ return 0
+}
