[gentoo-commits] proj/netifrc:master commit in: net/

[Robin H. Johnson]

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
+}