GPSR: examples: enable IPv6 addressing for GPSR-over-IPv6; re-record gpsr fingerprints

GPSR-over-IPv6 (configs IPv6/MultiIPv6) could not deliver: the example assigned
no global IPv6 addresses, so hosts had only link-local addresses, which IPv6 does
not forward. Add an Ipv6NetworkConfigurator -- conditional (hasIpv6Configurator,
enabled only by the IPv6 configs, so the IPv4/Generic runs are untouched) --
assign a single on-link /64, point the node IPv6 configurator at it (its default
networkConfiguratorModule is ""), and set sendRedirects=false to avoid the
redirect storm on this single-link multi-hop network.

GPSR-over-IPv6 now routes to global addresses and delivers end-to-end, but only
~2/17 vs IPv4's ~8/17: IPv6 Neighbor Discovery (address resolution + NUD)
congests the shared wireless medium far more than IPv4 ARP. Documented as a known
limitation in the ini.

Fingerprint re-records (behavior sanity-checked; deterministic across -r 2):
- gpsr IPv6, MultiIPv6: reflect the now-functional best-effort IPv6 delivery above.
- gpsr MultiIPv4, MultiGeneric: pre-existing drift from the IPv6 extension-header
  refactoring -- these multi-stack configs carry a co-resident IPv6 stack whose
  refactored ND timing shifts the shared-medium schedule. Behavior verified
  correct (both deliver 8/17); confirmed the drift is identical with and without
  the GPSR/IPv6 crash-chain, i.e. not introduced here.

Author: avarga

examples/manetrouting/gpsr/GPSRNetwork.ned

@@ -7,6 +7,7 @@ package inet.examples.manetrouting.gpsr;
 
 import inet.common.scenario.ScenarioManager;
 import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;
+import inet.networklayer.configurator.ipv6.Ipv6NetworkConfigurator;
 import inet.networklayer.ipv4.RoutingTableRecorder;
 import inet.node.gpsr.GpsrRouter;
 import inet.physicallayer.wireless.ieee80211.packetlevel.Ieee80211ScalarRadioMedium;
@@ -19,6 +20,7 @@ network GPSRNetworkRandom
 {
     parameters:
         int numHosts;
+        bool hasIpv6Configurator = default(false); // enabled by the IPv6 configs; kept off otherwise so it does not perturb the IPv4/Generic runs
     submodules:
         radioMedium: Ieee80211ScalarRadioMedium {
             parameters:
@@ -29,6 +31,10 @@ network GPSRNetworkRandom
                 config = xml("<config><interface hosts='*' address='145.236.x.x' netmask='255.255.0.0'/></config>");
                 @display("p=100,100;is=s");
         }
+        ipv6Configurator: Ipv6NetworkConfigurator if hasIpv6Configurator {
+            parameters:
+                @display("p=100,150;is=s");
+        }
         routingTableRecorder: RoutingTableRecorder {
             parameters:
                 @display("p=100,300;is=s");

examples/manetrouting/gpsr/omnetpp.ini

@@ -42,8 +42,22 @@ description = base config for Ipv4
 [Config _IPv6]
 abstract = true
 description = base config for Ipv6
+# NOTE: GPSR-over-IPv6 is only partially functional - it routes to global
+# addresses but end-to-end delivery is poor compared to IPv4, because IPv6's
+# Neighbor Discovery (address resolution + NUD) congests the shared wireless
+# medium far more than IPv4 ARP. This is a known limitation.
 **.gpsr.networkProtocolModule = "^.ipv6.ipv6"
 **.gpsr.routingTableModule = "^.ipv6.routingTable"
+# Assign global IPv6 addresses (a single on-link /64) so packets are forwardable
+# (link-local destinations are never forwarded). The node IPv6 configurator must
+# be pointed at the global Ipv6NetworkConfigurator explicitly (its default is "").
+*.hasIpv6Configurator = true
+**.ipv6.configurator.networkConfiguratorModule = "ipv6Configurator"
+*.ipv6Configurator.config = xml("<config><interface hosts='*' prefix='2001:db8::/64'/></config>")
+# In this single-link multi-hop ad-hoc network every forward goes back out the
+# arrival interface; sending ICMPv6 Redirects there is useless (the geographic
+# next hop is not reachable by the source) and causes a redirect storm.
+**.ipv6.ipv6.sendRedirects = false
 *.host[0].app[0].destAddr = "host[1](ipv6)"
 
 [Config _Generic]

tests/fingerprint/examples.csv

@@ -353,12 +353,12 @@
 # /examples/manetrouting/gpsr/,        -f omnetpp.ini -c _IPv6 -r 0,     # abstract-config
 # /examples/manetrouting/gpsr/,        -f omnetpp.ini -c _Generic -r 0,  # abstract-config
 /examples/manetrouting/gpsr/,        -f omnetpp.ini -c IPv4 -r 0,                   20s,             1128-a3bc/tplx;9f6c-df77/~tNl;5d32-0ae4/tyf, PASS,  wireless adhoc Ipv4
-/examples/manetrouting/gpsr/,        -f omnetpp.ini -c IPv6 -r 0,                   20s,             97ce-956e/tplx;5f9e-6f8e/~tNl;86e5-9659/tyf, PASS,  wireless adhoc
+/examples/manetrouting/gpsr/,        -f omnetpp.ini -c IPv6 -r 0,                   20s,             5a83-8612/tplx;2240-53c0/~tNl;56f2-3400/tyf, PASS,  wireless adhoc
 /examples/manetrouting/gpsr/,        -f omnetpp.ini -c Generic -r 0,                20s,             6b9d-8586/tplx;c58b-970e/~tNl;17f5-8ad3/tyf, PASS,  wireless adhoc
 # /examples/manetrouting/gpsr/,        -f omnetpp.ini -c _Multi -r 0,    # abstract-config
-/examples/manetrouting/gpsr/,        -f omnetpp.ini -c MultiIPv4 -r 0,              20s,             6ae2-6e71/tplx;4dbe-9ad0/~tNl;a896-f33a/tyf, PASS,  wireless adhoc Ipv4
-/examples/manetrouting/gpsr/,        -f omnetpp.ini -c MultiIPv6 -r 0,              20s,             97ce-956e/tplx;5f9e-6f8e/~tNl;0c65-a921/tyf, PASS,  wireless adhoc
-/examples/manetrouting/gpsr/,        -f omnetpp.ini -c MultiGeneric -r 0,           20s,             d87a-f4ab/tplx;bb2c-c633/~tNl;70dc-a9a2/tyf, PASS,  wireless adhoc
+/examples/manetrouting/gpsr/,        -f omnetpp.ini -c MultiIPv4 -r 0,              20s,             d4a1-5cf9/tplx;c727-b58f/~tNl;9675-abeb/tyf, PASS,  wireless adhoc Ipv4
+/examples/manetrouting/gpsr/,        -f omnetpp.ini -c MultiIPv6 -r 0,              20s,             5a83-8612/tplx;2240-53c0/~tNl;cb6c-dc96/tyf, PASS,  wireless adhoc
+/examples/manetrouting/gpsr/,        -f omnetpp.ini -c MultiGeneric -r 0,           20s,             5c6b-556c/tplx;e56d-c248/~tNl;ea54-2fef/tyf, PASS,  wireless adhoc
 /examples/manetrouting/gpsr/,        -f omnetpp.ini -c Manual -r 0,                 20s,             41d0-4325/tplx;b911-bca9/~tNl;8a0e-d569/tyf, PASS,  wireless adhoc Ipv4
 # /examples/manetrouting/gpsr/,        -f omnetpp.ini -c _Dynamic -r 0,  # abstract-config
 /examples/manetrouting/gpsr/,        -f omnetpp.ini -c DynamicIPv4 -r 0,            20s,             ce31-f8ed/tplx;8a3b-235d/~tNl;3ecd-bfef/tyf, PASS,  wireless adhoc Ipv4