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Merge pull request #178 from andreas-ibm/ovs

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add comments to the OVS service
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bharnden 2020-04-30 12:33:14 -07:00 committed by GitHub
commit 98c9730967
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1 changed files with 26 additions and 14 deletions
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40
daemon/core/services/sdn.py
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@ -40,10 +40,15 @@ class OvsService(SdnService):
cfg = "#!/bin/sh\n"
cfg += "# auto-generated by OvsService (OvsService.py)\n"
cfg += "/etc/init.d/openvswitch-switch start < /dev/null\n"
cfg += "## First make sure that the ovs services are up and running\n"
cfg += "/etc/init.d/openvswitch-switch start < /dev/null\n\n"
cfg += "## create the switch itself, set the fail mode to secure, \n"
cfg += "## this stops it from routing traffic without defined flows.\n"
cfg += "## remove the -- and everything after if you want it to act as a regular switch\n"
cfg += "ovs-vsctl add-br ovsbr0 -- set Bridge ovsbr0 fail-mode=secure\n"
cfg += "ip link set dev ovsbr0 up\n"
cfg += "\n## Now add all our interfaces as ports to the switch\n"
portnum = 1
for ifc in node.netifs():
if hasattr(ifc, "control") and ifc.control is True:
continue
@ -51,9 +56,8 @@ class OvsService(SdnService):
ifnum = ifnumstr[0]
# create virtual interfaces
cfg += "## Create a veth pair to send the data to\n"
cfg += "ip link add rtr%s type veth peer name sw%s\n" % (ifnum, ifnum)
cfg += "ip link set dev rtr%s up\n" % ifnum
cfg += "ip link set dev sw%s up\n" % ifnum
# remove ip address of eths because quagga/zebra will assign same IPs to rtr interfaces
# or assign them manually to rtr interfaces if zebra is not running
@ -71,25 +75,33 @@ class OvsService(SdnService):
raise ValueError("invalid address: %s" % ifcaddr)
# add interfaces to bridge
cfg += "ovs-vsctl add-port ovsbr0 eth%s\n" % ifnum
cfg += "ovs-vsctl add-port ovsbr0 sw%s\n" % ifnum
# Make port numbers explicit so they're easier to follow in reading the script
cfg += "## Add the CORE interface to the switch\n"
cfg += "ovs-vsctl add-port ovsbr0 eth%s -- set Interface eth%s ofport_request=%d\n" % (ifnum, ifnum, portnum)
cfg += "## And then add its sibling veth interface\n"
cfg += "ovs-vsctl add-port ovsbr0 sw%s -- set Interface sw%s ofport_request=%d\n" % (ifnum, ifnum, portnum+1)
cfg += "## start them up so we can send/receive data\n"
cfg += "ovs-ofctl mod-port ovsbr0 eth%s up\n" % ifnum
cfg += "ovs-ofctl mod-port ovsbr0 sw%s up\n" % ifnum
cfg += "## Bring up the lower part of the veth pair\n"
cfg += "ip link set dev rtr%s up\n" % ifnum
portnum += 2
# Add rule for default controller if there is one local (even if the controller is not local, it finds it)
cfg += "\n## We assume there will be an SDN controller on the other end of this, \n"
cfg += "## but it will still function if there's not\n"
cfg += "ovs-vsctl set-controller ovsbr0 tcp:127.0.0.1:6633\n"
cfg += "\n## Now to create some default flows, \n"
cfg += "## if the above controller will be present then you probably want to delete them\n"
# Setup default flows
portnum = 1
for ifc in node.netifs():
if hasattr(ifc, "control") and ifc.control is True:
continue
cfg += (
"ovs-ofctl add-flow ovsbr0 priority=1000,in_port=%d,action=output:%d\n"
% (portnum, portnum + 1)
)
cfg += (
"ovs-ofctl add-flow ovsbr0 priority=1000,in_port=%d,action=output:%d\n"
% (portnum + 1, portnum)
)
cfg += "## Take the data from the CORE interface and put it on the veth and vice versa\n"
cfg += "ovs-ofctl add-flow ovsbr0 priority=1000,in_port=%d,action=output:%d\n" % (portnum, portnum + 1)
cfg += "ovs-ofctl add-flow ovsbr0 priority=1000,in_port=%d,action=output:%d\n" % (portnum + 1, portnum)
portnum += 2
return cfg