Solaris doesn't have an easy way to retrieve the MAC address of the client
that is soliciting the DHCPv6 IP address. This fix uses a simple way to
retrieve the client MAC address from the client's EUI64 link-local address.

diff --git a/src/dhcp6.c b/src/dhcp6.c
index 9901e1b..49a092b 100644
--- a/src/dhcp6.c
+++ b/src/dhcp6.c
@@ -261,6 +261,23 @@ void dhcp6_packet(time_t now)
 
 void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac, unsigned int *maclenp, unsigned int *mactypep, time_t now)
 {
+#ifdef HAVE_SOLARIS_NETWORK
+/* Solaris does not have an easy way to retrieve MAC address for a given IPv6 address from the kernel.
+   For now the following workaround should work for OpenStack's needs. */
+  uint8_t *addr6;
+
+  *maclenp = ETHER_ADDR_LEN;
+  *mactypep = ARPHRD_ETHER;
+  /* Take the EUI64 based client's link-local address and convert it to client's MAC address.
+     For example: from fe80::f816:3eff:fe5c:df43 link-local address we arrive at fa:16:3e:5c:df:43 */
+  addr6 = client->s6_addr;
+  mac[0] = addr6[8] ^ 0x2;
+  mac[1] = addr6[9];
+  mac[2] = addr6[10];
+  mac[3] = addr6[13];
+  mac[4] = addr6[14];
+  mac[5]= addr6[15];
+#else
   /* Receiving a packet from a host does not populate the neighbour
      cache, so we send a neighbour discovery request if we can't 
      find the sender. Repeat a few times in case of packet loss. */
@@ -301,6 +318,7 @@ void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac, unsi
 
   *maclenp = maclen;
   *mactypep = ARPHRD_ETHER;
+#endif /* HAVE_SOLARIS_NETWORK */
 }
     
 static int complete_context6(struct in6_addr *local,  int prefix,