[ovs-discuss] Usermode pipeline processing

[Nataliia Trifonova]

I am using OVS usermode and trying to pop MPLS and change IP packet headers:


Match incomimg MPLS packet in tabel 0:
                match = self.ofp_parser.OFPMatch(eth_type = 0x8847,
mpls_label = 102)
                actions = [ofp_parser.OFPActionPopMpls(0x0800), ]
                instructions =
[ofp_parser.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS, actions),
ofp_parser.OFPInstructionGotoTable(1)]
                req =  ofp_parser.OFPFlowMod(dp, cookie, cookie_mask, 0,
cmd, idle_timeout, hard_timeout, prio, buffer_id, out_port, out_group,
flags, match, instructions)
                self.dp.send_msg(req)


Match resulting IPv4 packet in table 1:
            match = self.ofp_parser.OFPMatch(eth_type = 0x0800) #, metadata
= 1) #, ipv4_src = mapping.sst, ipv4_dst = mapping.dst)
                actions =
[ofp_parser.OFPActionSetField(self.set_field_eth_dst(hostb_lan0)), ]

actions.append(ofp_parser.OFPActionSetField(self.set_field_eth_src(cesb_lan0)))

actions.append(ofp_parser.OFPActionSetField(self.set_field_ipv4_src(mapping.pipb)))

actions.append(ofp_parser.OFPActionSetField(self.set_field_ipv4_dst(mapping.ipb)))
                actions.append(ofp_parser.OFPActionOutput(1))
                instructions =
[ofp_parser.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS, actions), ]
                req =  ofp_parser.OFPFlowMod(dp, cookie, cookie_mask, 1,
cmd, idle_timeout, hard_timeout, prio, buffer_id, out_port, out_group,
flags, match, instructions)
                self.dp.send_msg(req)
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