Add square configuration

namespace_demo/topo-square.sh

+#!/bin/bash -ex
+# topo square creates the following network topology:
+#
+#
+#        A --------- br0 -------- B
+#        |  ab                ba  |
+#        |ac                    bd|
+#        |                        |
+#        |                        |
+#        |                        |
+#       br1                      br3
+#        |                        |
+#        |                        |
+#        |                        |
+#        |ca                    db|
+#        |   cd               dc  |
+#        C ---------- br2 ------- D
+#
+#
+#
+# should be run under unshare -mrun .
+# use nsenter --net={A,B,C,D} to enter into network namespace of A/B/C/D.
+#
+# Based on https://github.com/troglobit/smcroute/tree/master/test
+
+rm -f A B C D
+touch A B C D
+PID=$$
+
+# A-br0-B
+unshare --net=B --mount=B -- ip link set lo up
+nsenter --net=B -- ip link add ba type veth peer BA
+nsenter --net=B -- ip link set BA netns $PID
+nsenter --net=B -- ip link set ba up
+ip link set BA up
+
+unshare --net=A -- ip link set lo up
+nsenter --net=A -- ip link add ab type veth peer AB
+nsenter --net=A -- ip link set AB netns $PID
+nsenter --net=A -- ip link set ab up
+ip link set AB up
+
+ip link add br0 type bridge # vlan_filtering 1 mcast_snooping 0
+ip link set BA master br0
+ip link set AB master br0
+ip link set br0 up
+
+# A-br1-C
+nsenter --net=A -- ip link add ac type veth peer AC
+nsenter --net=A -- ip link set AC netns $PID
+nsenter --net=A -- ip link set ac up
+ip link set AC up
+
+unshare --net=C -- ip link set lo up
+nsenter --net=C -- ip link add ca type veth peer CA
+nsenter --net=C -- ip link set CA netns $PID
+nsenter --net=C -- ip link set ca up
+ip link set CA up
+
+ip link add br1 type bridge # vlan_filtering 1 mcast_snooping 0
+ip link set CA master br1
+ip link set AC master br1
+ip link set br1 up
+
+# C-br2-D
+nsenter --net=C -- ip link add cd type veth peer CD
+nsenter --net=C -- ip link set CD netns $PID
+nsenter --net=C -- ip link set cd up
+ip link set CD up
+
+unshare --net=D -- ip link set lo up
+nsenter --net=D -- ip link add dc type veth peer DC
+nsenter --net=D -- ip link set DC netns $PID
+nsenter --net=D -- ip link set dc up
+ip link set DC up
+
+ip link add br2 type bridge # vlan_filtering 1 mcast_snooping 0
+ip link set CD master br2
+ip link set DC master br2
+ip link set br2 up
+
+# B-br3-D
+nsenter --net=B -- ip link add bd type veth peer BD
+nsenter --net=B -- ip link set BD netns $PID
+nsenter --net=B -- ip link set bd up
+ip link set BD up
+
+nsenter --net=D -- ip link add db type veth peer DB
+nsenter --net=D -- ip link set DB netns $PID
+nsenter --net=D -- ip link set db up
+ip link set DB up
+
+ip link add br3 type bridge # vlan_filtering 1 mcast_snooping 0
+ip link set BD master br3
+ip link set DB master br3
+ip link set br3 up
+
+# addresses
+nsenter --net=B -- ip addr add 10.0.0.1/24 dev ba
+nsenter --net=A -- ip addr add 10.0.0.2/24 dev ab
+nsenter --net=C -- ip addr add 20.0.0.1/24 dev ca
+nsenter --net=A -- ip addr add 20.0.0.2/24 dev ac
+nsenter --net=B -- ip addr add 30.0.0.1/24 dev bd
+nsenter --net=D -- ip addr add 30.0.0.2/24 dev db
+nsenter --net=C -- ip addr add 40.0.0.1/24 dev cd
+nsenter --net=D -- ip addr add 40.0.0.2/24 dev dc
+
+# multicast routing
+#nsenter --net=B -- ip route add 224.0.0.0/4 dev b1
+#nsenter --net=C -- ip route add 224.0.0.0/4 dev c1
+#
+#nsenter --net=A -- ip route add    224.0.0.0/4 dev a1   # NOTE on A 224.0.0.0/4 is routed
+#nsenter --net=A -- ip route append 224.0.0.0/4 dev a2   # to _both_ a1 and a2
+
+
+
+# pim-dm
+sed -e 's/IF0/ab/g' -e 's/IF1/ac/g' pim-dm.yaml.tmpl > pim-dm_A.yaml
+sed -e 's/IF0/ba/g' -e 's/IF1/bd/g' pim-dm.yaml.tmpl > pim-dm_B.yaml
+sed -e 's/IF0/ca/g' -e 's/IF1/cd/g' pim-dm.yaml.tmpl > pim-dm_C.yaml
+sed -e 's/IF0/dc/g' -e 's/IF1/db/g' pim-dm.yaml.tmpl > pim-dm_D.yaml
+
+# we need to mount private /var/run in each namespace so that pim-dm can be started
+#nsenter --net=A -- pim-dm -config pim-dm_A.yaml &
+#nsenter --net=B -- pim-dm -config pim-dm_B.yaml &
+#nsenter --net=C -- pim-dm -config pim-dm_C.yaml &
+#nsenter --net=D -- pim-dm -config pim-dm_D.yaml &
+
+# open terminals in A B C D for play
+nsenter --net=A -- xfce4-terminal --title=A &
+nsenter --net=B -- xfce4-terminal --title=B &
+nsenter --net=C -- xfce4-terminal --title=C &
+nsenter --net=D -- xfce4-terminal --title=D &