vethsetup shell script for qbg22 testing

Add a shell script to create 2 virtual ethernet interfaces
connected to each other (named veth0 and veth2), assign it
an ip address and assign veth2 to a newly created network
namespace bridge_ns.

The qbg22sim protocol simulator for evb22 and ecp22 protocol
tests and the lldpad in bridge mode use the
bridge_ns name space and ethernet interface veth2.

Signed-off-by: Thomas Richter <[email protected]>
Signed-off-by: John Fastabend <[email protected]>

test/qbg22/veth-setup.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+#
+# Thomas Richter, DCN Linux Technology Center, IBM Research, Germany 29-Apr-2013
+#
+# Setup a lldpad test environment with 2 virtual ethernet device in 2 different
+# network name spaces.
+# lldpad runs in default name space and the qbg22sim runs in the newly created
+# bridge_ns name space. veth0 is in the default net name space where as
+# interface veth2 is in the bridge_ns name space
+#
+
+# Check if the name space already exists. Also check if the interface veth0
+# has been defined.
+if ip netns list | fgrep -qi bridge_ns
+then
+	if ip link | fgrep -qi veth0
+	then
+		if ip netns exec bridge_ns ip link | fgrep -qi veth2
+		then
+			exit 0		# veth0 and veht2 exists
+		else
+			echo interface veth2 missing
+			ip netns del bridge_ns
+		fi
+	else
+		ip netns del bridge_ns
+	fi
+fi
+
+# create veth pair(veth0, veth2)
+ip link add veth0 type veth peer name veth2
+ip link set veth0 up
+ip addr add 50.0.0.1/24 dev veth0
+
+# create a new network namespace bridge_ns, bring up veth0 and assign an ip addr
+ip netns add bridge_ns
+
+# move veth2 to bridge_ns
+ip link set veth2 netns bridge_ns
+ip netns exec bridge_ns ip link set veth2 up
+ip netns exec bridge_ns ip addr add 50.0.0.2/24 dev veth2
+
+# exec bash in bridge_ns
+# ip netns exec bridge_ns bash