commit 8a41a5d140b3cf56a54bdeef234e89ee12cba0dc
author Lorenzo Colitti <lorenzo@google.com> Tue Oct 21 12:37:48 2014 +0900
committer Lorenzo Colitti <lorenzo@google.com> Wed Oct 29 11:53:05 2014 +0900
tree 0c9d8647d776b79d18cc169425a347aed38a5d87
parent 1352a3a26c4d7c32b38b7fadb837799a23014aa6

Support 464xlat on broadcast interfaces such as wifi.

This works by generating a random IID and then using the
IPV6_JOIN_ANYCAST socket option on the write-only raw socket to
configure an address on the interface.

Change-Id: Ieb885b7c54454988e2e4254a14b4213cba3bd791

clatd.c

diff --git a/clatd.c b/clatd.c
index 78ccccc..41e961e 100644
--- a/clatd.c
+++ b/clatd.c
@@ -275,10 +275,12 @@
     char from_addr[INET6_ADDRSTRLEN];
     inet_ntop(AF_INET6, &Global_Clatd_Config.ipv6_local_subnet, from_addr, sizeof(from_addr));
     logmsg(ANDROID_LOG_INFO, "clat IPv6 address changed from %s to %s", from_addr, addrstr);
+    del_anycast_address(tunnel->write_fd6, &Global_Clatd_Config.ipv6_local_subnet);
   }
 
   // Start translating packets to the new prefix.
   Global_Clatd_Config.ipv6_local_subnet = interface_ip->ip6;
+  add_anycast_address(tunnel->write_fd6, &Global_Clatd_Config.ipv6_local_subnet, interface);
   free(interface_ip);
 
   // Update our packet socket filter to reflect the new 464xlat IP address.
@@ -534,9 +536,11 @@
     logmsg(ANDROID_LOG_FATAL, "sigterm handler failed: %s", strerror(errno));
     exit(1);
   }
+
   event_loop(&tunnel);
 
   logmsg(ANDROID_LOG_INFO,"Shutting down clat on %s", uplink_interface);
+  del_anycast_address(tunnel.write_fd6, &Global_Clatd_Config.ipv6_local_subnet);
 
   return 0;
 }