[controller] re-enable ipv6 for ALL interfaces

doc/plan.org

@@ -159,6 +159,79 @@ user@T:~# iptables  -t mangle -A PREROUTING \
      - IPv4 default router = 10.0.0.42
 **** Neighbor discover protocol
      - Matching on prefix & ingress port, setting multicast
+
+Being forwarded:
+
+p4@ubuntu:~/master-thesis$ mx h1 tcpdump -ni h1-eth0
+sudo: unable to resolve host ubuntu
+tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
+listening on h1-eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
+^C14:59:22.871803 IP6 2001:db8:62::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2001:db8:62::2, length 32
+14:59:23.863913 IP6 2001:db8:62::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2001:db8:62::2, length 32
+14:59:24.864033 IP6 2001:db8:62::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2001:db8:62::2, length 32
+
+3 packets captured
+3 packets received by filter
+0 packets dropped by kernel
+
+But no answer yet!
+
+
+root@ubuntu:~/master-thesis/p4app# ip a
+1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
+    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
+    inet 127.0.0.1/8 scope host lo
+       valid_lft forever preferred_lft forever
+    inet6 ::1/128 scope host
+       valid_lft forever preferred_lft forever
+2: h1-eth0@if123: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9500 qdisc netem state UP group default qlen 1000
+    link/ether 00:00:0a:00:00:01 brd ff:ff:ff:ff:ff:ff link-netnsid 0
+    inet6 2001:db8:62::2/64 scope global
+       valid_lft forever preferred_lft forever
+    inet6 2001:db8:61::1/64 scope global
+       valid_lft forever preferred_lft forever
+    inet6 fe80::200:aff:fe00:1/64 scope link
+       valid_lft forever preferred_lft forever
+root@ubuntu:~/master-thesis/p4app#
+
+Link local communication does not work:
+
+root@ubuntu:~/master-thesis/p4app# ping6 -c1 fe80::200:aff:fe00:2%h1-eth0
+PING fe80::200:aff:fe00:2%h1-eth0(fe80::200:aff:fe00:2) 56 data bytes
+From fe80::200:aff:fe00:1 icmp_seq=1 Destination unreachable: Address unreachable
+
+--- fe80::200:aff:fe00:2%h1-eth0 ping statistics ---
+1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms
+
+root@ubuntu:~/master-thesis/p4app#
+
+Packet is received on the other host, but not answered. Why?
+
+Real trace from my network:
+
+18:48:17.008524 IP6 2a0a:e5c1:111:111:eb7:ffdb:e245:f712 > ff02::1:ffb7:e225: ICMP6, neighbor solicitation, who has 2a0a:e5c1:111:111:1016:3c5a:38b7:e225, length 32
+18:48:18.015016 IP6 2a0a:e5c1:111:111:eb7:ffdb:e245:f712 > ff02::1:ffb7:e225: ICMP6, neighbor solicitation, who has 2a0a:e5c1:111:111:1016:3c5a:38b7:e225, length 32
+18:48:18.031165 IP6 2a0a:e5c1:111:111:1016:3c5a:38b7:e225 > 2a0a:e5c1:111:111:eb7:ffdb:e245:f712: ICMP6, neighbor advertisement, tgt is 2a0a:e5c1:111:111:1016:3c5a:38b7:e225, length 32
+18:48:18.031236 IP6 2a0a:e5c1:111:111:eb7:ffdb:e245:f712 > 2a0a:e5c1:111:111:1016:3c5a:38b7:e225: ICMP6, echo request, seq 1, length 64
+18:48:18.031267 IP6 2a0a:e5c1:111:111:eb7:ffdb:e245:f712 > 2a0a:e5c1:111:111:1016:3c5a:38b7:e225: ICMP6, echo request, seq 2, length 64
+18:48:18.131709 IP6 2a0a:e5c1:111:111:1016:3c5a:38b7:e225 > 2a0a:e5c1:111:111:eb7:ffdb:e245:f712: ICMP6, echo reply, seq 1, length 64
+18:48:18.131732 IP6 2a0a:e5c1:111:111:1016:3c5a:38b7:e225 > 2a0a:e5c1:111:111:eb7:ffdb:e245:f712: ICMP6, echo reply, seq 2, length 64
+
+
+root@ubuntu:~/master-thesis/p4app# cat /proc/sys/net/ipv6/conf/*/disable_ipv6
+1
+1
+0
+0
+root@ubuntu:~/master-thesis/p4app#
+root@ubuntu:~/master-thesis/p4app# ls -1 /proc/sys/net/ipv6/conf/*/disable_ipv6
+/proc/sys/net/ipv6/conf/all/disable_ipv6
+/proc/sys/net/ipv6/conf/default/disable_ipv6
+/proc/sys/net/ipv6/conf/h1-eth0/disable_ipv6
+/proc/sys/net/ipv6/conf/lo/disable_ipv6
+root@ubuntu:~/master-thesis/p4app#
+
+
 **** Static mappings
       - likely need table(s)
       - need tcp & udp translation

p4app/controller.py

@@ -76,8 +76,8 @@ class L2Controller(object):
     @staticmethod
     def add_host_ips(host, net, ipaddr, dev):
         subprocess.call(["mx", host, "ip", "addr", "flush", "dev", dev])
-        subprocess.call(["mx", host, "sysctl", "net.ipv6.conf.lo.disable_ipv6=0"])
+        for v6dev in [ "lo", "default", "all", dev ]:
-        subprocess.call(["mx", host, "sysctl", "net.ipv6.conf.{}.disable_ipv6=0".format(dev)])
+            subprocess.call(["mx", host, "sysctl", "net.ipv6.conf.{}.disable_ipv6=0".format(v6dev)])
 
         # Set down & up to regain link local address
         subprocess.call(["mx", host, "ip", "link", "set", dev, "down"])