Begin to implement egress handling, make controller usable, update notes

.gitignore

@@ -0,0 +1 @@
+support/

doc/plan.org

@@ -6,6 +6,9 @@
 | 2019-02-21 | Clarifications Ueli Maurer (Mentor)                                        | x     |
 |            | Write mail / phone                                                         | x     |
 | 2019-02-22 | Have all papers handed in                                                  |       |
+| 2019-02-28 | Meet Laurent #2                                                            |       |
+|            | - Parser for all protocols (udp,tcp,icmp,icmp6)                            |       |
+|            |                                                                            |       |
 |            |                                                                            |       |
 | 2019-02-22 | Have rough definition of tasks                                             |       |
 | 2019-03-01 | Feature list / priority list / roadmap clear                               |       |
@@ -47,10 +50,11 @@
 *** DONE Get feature list of tayga
 *** DONE Setup P4 base / structure
 *** DONE Create minimal controller for populating tables
-*** TODO Checkout egress setting
+*** TODO Checkout / review egress settings
 *** TODO Implement ICMP <-> ICMP6 translation
-**** TODO Parse icmp
+**** DONE Parse icmp
-**** TODO Parse icmpv6
+**** DONE Parse icmpv6
+**** TODO Add (static) egress configuration
 **** TODO Translate icmp <-> icmp6
 **** TODO Create table entry for mapping v4->v6 [net]
 **** TODO Create table entry for mapping v6->v4 [net]
@@ -114,6 +118,7 @@ user@T:~# iptables  -t mangle -A PREROUTING \
 *** P4 based implementation
     TBD
 **** General
+
      - IPv6 subnet 2001:db8::/32
      - IPv6 hosts are in 2001:db8:6::/64
      - IPv6 default router (::/0) is 2001:db8:6::42/64

p4app/controller.py

@@ -12,6 +12,9 @@ import sys
 import re
 
 import logging
+import argparse
+import ipaddress
+
 logging.basicConfig()
 log = logging.getLogger("main")
 
@@ -20,6 +23,18 @@ class L2Controller(object):
         self.init_boilerplate(sw_name)
         self.init()
 
+        self.modes = ['base']
+
+        # Network / egress
+        self.v6_routes = {}
+        self.v6_routes['base'] = []
+        self.v6_routes['base'].append({ "net": "2001:db8:61::/64", "port": "1"})
+        self.v6_routes['base'].append({ "net": "2001:db8:62::/64", "port": "2"})
+        self.v4_routes = {}
+        self.v4_routes['base'] = []
+        self.v4_routes['base'].append({ "net": "10.0.41.0/24", "port": "3"})
+        self.v4_routes['base'].append({ "net": "10.0.42.0/24", "port": "4"})
+
     def init_boilerplate(self, sw_name):
         self.topo = Topology(db="topology.db")
         self.sw_name = sw_name
@@ -31,6 +46,7 @@ class L2Controller(object):
     def init(self):
         self.controller.reset_state()
         self.fill_tables()
+        self.config_hosts()
         self.add_mirror()
 
     def add_mirror(self):
@@ -38,6 +54,17 @@ class L2Controller(object):
             self.controller.mirroring_add(100, self.cpu_port)
 
     def fill_tables(self):
+        for v6route in self.v6_routes[self.mode]:
+            self.controller.table_add("v6_routing", "set_egress_port", [v6route['net']], [v6route['port']])
+
+        for v4route in self.v4_routes[self.mode]:
+            self.controller.table_add("v4_routing", "set_egress_port", [v4route['net']], [v4route['port']])
+
+    def config_hosts(self):
+        """ Assumptions:
+        - all routes are networks (no /128 v6 or /32 v4
+        - hosts get the first ip address in the network
+        """
         pass
 
     def debug_print_pkg(self, pkg, msg="INCOMING"):
@@ -78,6 +105,13 @@ class L2Controller(object):
     def run_cpu_port_loop(self):
         sniff(iface=self.intf, prn=self.recv_msg_cpu)
 
+    def commandline(self):
+        parser = argparse.ArgumentParser(description='controller++')
+        parser.add_argument('--mode', help='Select mode / settings to use', choices=self.modes)
+        args = parser.parse_args()
+        self.mode = args.mode
+
+
 if __name__ == "__main__":
     import sys
     import os
@@ -91,4 +125,7 @@ if __name__ == "__main__":
     log.debug("Debug enabled.")
 
     sw_name = "s1"
-    controller = L2Controller(sw_name).run_cpu_port_loop()
+    controller = L2Controller(sw_name)
+
+    controller.commandline()
+    controller.run_cpu_port_loop()

p4src/settings.p4

@@ -8,5 +8,6 @@
 
 #define THE_ANSWER_TO_LIFE_THE_UNIVERSE_AND_EVERYTHING 42
 
+#define ROUTING_TABLE_SIZE = 64                               /* maximum routes per protocol */
 
 #endif

p4src/static-mapping.p4

@@ -16,8 +16,38 @@ control MyIngress(inout headers hdr,
     inout metadata meta,
     inout standard_metadata_t standard_metadata) {
 
-    apply {
+	/********************** ROUTING (egress definiton) TABLES ***********************************/
+	action set_egress_port (port_t out_port) {
+        standard_metadata.egress_spec = out_port;
+	}
 
+    table v6_routing {
+        key = {
+            hdr.ipv6.dst_addr: lpm;
+        }
+        actions = {
+			set_egress_port;
+            NoAction;
+        }
+        size = ROUTING_TABLE_SIZE;
+        default_action = NoAction;
+    }
+
+    table v4_routing {
+        key = {
+            hdr.ipv4.dst_addr: lpm;
+        }
+        actions = {
+			set_egress_port;
+            NoAction;
+        }
+        size = ROUTING_TABLE_SIZE;
+        default_action = NoAction;
+    }
+
+    apply {
+        v6_routing.apply()
+        v4_routing.apply()
     }
 }