From 251813a6dd29410fca51e622994386eccdf60d4a Mon Sep 17 00:00:00 2001
From: Adam Dunkels <adam@thingsquare.com>
Date: Tue, 24 Mar 2015 10:51:51 +0100
Subject: [PATCH] Maintain stats about how many packets have been translated
 from IPv4 to IPv6 and vice versa

---
 core/net/ip64/ip64-addrmap.c | 4 ++++
 core/net/ip64/ip64-addrmap.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/core/net/ip64/ip64-addrmap.c b/core/net/ip64/ip64-addrmap.c
index 4f197e742..3a36b2344 100644
--- a/core/net/ip64/ip64-addrmap.c
+++ b/core/net/ip64/ip64-addrmap.c
@@ -149,6 +149,7 @@ ip64_addrmap_lookup(const uip_ip6addr_t *ip6addr,
        m->ip6port == ip6port &&
        uip_ip4addr_cmp(&m->ip4addr, ip4addr) &&
        uip_ip6addr_cmp(&m->ip6addr, ip6addr)) {
+      m->ip6to4++;
       return m;
     }
   }
@@ -167,6 +168,7 @@ ip64_addrmap_lookup_port(uint16_t mapped_port, uint8_t protocol)
 	   m->protocol, protocol);
     if(m->mapped_port == mapped_port &&
        m->protocol == protocol) {
+      m->ip4to6++;
       return m;
     }
   }
@@ -205,6 +207,8 @@ ip64_addrmap_create(const uip_ip6addr_t *ip6addr,
     m->ip6port = ip6port;
     m->protocol = protocol;
     m->flags = FLAGS_NONE;
+    m->ip6to4 = 1;
+    m->ip4to6 = 0;
     timer_set(&m->timer, 0);
 
     /* Pick a new, unused local port. First make sure that the
diff --git a/core/net/ip64/ip64-addrmap.h b/core/net/ip64/ip64-addrmap.h
index 3ca56d2de..c4a31efcc 100644
--- a/core/net/ip64/ip64-addrmap.h
+++ b/core/net/ip64/ip64-addrmap.h
@@ -41,6 +41,7 @@ struct ip64_addrmap_entry {
   struct timer timer;
   uip_ip6addr_t ip6addr;
   uip_ip4addr_t ip4addr;
+  uint32_t ip6to4, ip4to6;
   uint16_t mapped_port;
   uint16_t ip6port;
   uint16_t ip4port;