From 8ca0c7fdf42ecc483af76eed3d2efb0567cf6090 Mon Sep 17 00:00:00 2001
From: Nico Schottelius <nico@nico-notebook.schottelius.org>
Date: Sun, 24 Feb 2019 20:13:42 +0100
Subject: [PATCH] [controller] Add support in hosts for link local

---
 doc/plan.org        | 13 ++++++++++++-
 p4app/controller.py |  6 ++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/doc/plan.org b/doc/plan.org
index c2d0e05..a266c93 100644
--- a/doc/plan.org
+++ b/doc/plan.org
@@ -16,6 +16,8 @@
 |            |                                                                            |       |
 |            | egress routing                                                             | x     |
 |            |                                                                            |       |
+| 2019-02-24 | non reliable neighbor entries / flushing addresses puts into failed        |       |
+|            |                                                                            |       |
 |            |                                                                            |       |
 | 2019-02-28 | Meet Laurent #2                                                            |       |
 |            | - Parser for all protocols (udp,tcp,icmp,icmp6)                            |       |
@@ -66,7 +68,12 @@
 **** DONE Parse icmp
 **** DONE Parse icmpv6
 **** DONE Add (static) egress configuration
-**** TODO Calculate ICMP6 checksums
+**** DONE Calculate ICMP6 checksums
+**** TODO Implement minimal neighbor discovery
+***** TODO For the switch
+***** TODO For other nodes -> multicast
+***** TODO Maybe implement link local addresses (missing at the moment)
+****** ff02::/??
 **** TODO Make switch answer icmp6 echo request for
 **** TODO Make switch answer icmp echo request for
 **** TODO Add default route for v6 and v4 hosts
@@ -186,6 +193,10 @@ listening on h1-eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
 4 packets received by filter
 0 packets dropped by kernel
 root@ubuntu:~/master-thesis#
+***** When pinging we see
+DEBUG:main:INCOMING: <Ether  dst=33:33:ff:00:00:42 src=00:00:0a:00:00:01 type=0x86dd |<IPv6  version=6 tc=0 fl=0 plen=32 nh=ICMPv6 hlim=255 src=2001:db8:61::1 dst=ff02::1:ff00:42 |<ICMPv6ND_NS  type=Neighbor Solicitation code=0 cksum=0xd343 res=0 tgt=2001:db8:61::42 |<ICMPv6NDOptSrcLLAddr  type=1 len=1 lladdr=00:00:0a:00:00:01 |>>>>
+DEBUG:main:INCOMING: <Ether  dst=33:33:ff:00:00:42 src=00:00:0a:00:00:01 type=0x86dd |<IPv6  version=6 tc=0 fl=0 plen=32 nh=ICMPv6 hlim=255 src=2001:db8:61::1 dst=ff02::1:ff00:42 |<ICMPv6ND_NS  type=Neighbor Solicitation code=0 cksum=0xd343 res=0 tgt=2001:db8:61::42 |<ICMPv6NDOptSrcLLAddr  type=1 len=1 lladdr=00:00:0a:00:00:01 |>>>>
+DEBUG:main:INCOMING: <Ether  dst=33:33:ff:00:00:42 src=00:00:0a:00:00:01 type=0x86dd |<IPv6  version=6 tc=0 fl=0 plen=32 nh=ICMPv6 hlim=255 src=2001:db8:61::1 dst=ff02::1:ff00:42 |<ICMPv6ND_NS  type=Neighbor Solicitation code=0 cksum=0xd343 res=0 tgt=2001:db8:61::42 |<ICMPv6NDOptSrcLLAddr  type=1 len=1 lladdr=00:00:0a:00:00:01 |>>>>
 
 
 ***** Hosts
diff --git a/p4app/controller.py b/p4app/controller.py
index 3131d84..5a1d1a8 100644
--- a/p4app/controller.py
+++ b/p4app/controller.py
@@ -78,6 +78,12 @@ class L2Controller(object):
         subprocess.call(["mx", host, "ip", "addr", "flush", "dev", dev])
         subprocess.call(["mx", host, "sysctl", "net.ipv6.conf.lo.disable_ipv6=0"])
         subprocess.call(["mx", host, "sysctl", "net.ipv6.conf.{}.disable_ipv6=0".format(dev)])
+
+        # Set down & up to regain link local address
+        subprocess.call(["mx", host, "ip", "link", "set", dev, "down"])
+        subprocess.call(["mx", host, "ip", "link", "set", dev, "up"])
+
+        # Now add global address
         subprocess.call(["mx", host, "ip", "addr", "add", ipaddr, "dev", dev])
 
     def init_boilerplate(self, sw_name):