Merge pull request #2061 from cetic/pr-nat64-small-updates

Various updates for NAT64

core/net/ip/ip64-addr.c

@@ -35,6 +35,10 @@
 #include <string.h>
 
 #define printf(...)
+
+static uip_ip6addr_t ip64_prefix = {{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 0, 0, 0}};
+static uint8_t ip64_prefix_len = 96;
+
 /*---------------------------------------------------------------------------*/
 void
 ip64_addr_copy4(uip_ip4addr_t *dest, const uip_ip4addr_t *src)
@@ -56,20 +60,7 @@ ip64_addr_4to6(const uip_ip4addr_t *ipv4addr,
      addresses. It returns 0 if it failed to convert the address and
      non-zero if it could successfully convert the address. */
 
-  /* The IPv4 address is encoded as an IPv6-encoded IPv4 address in
+  uip_ipaddr_copy(ipv6addr, &ip64_prefix);
-     the ::ffff:0000/24 prefix.*/
-  ipv6addr->u8[0] = 0;
-  ipv6addr->u8[1] = 0;
-  ipv6addr->u8[2] = 0;
-  ipv6addr->u8[3] = 0;
-  ipv6addr->u8[4] = 0;
-  ipv6addr->u8[5] = 0;
-  ipv6addr->u8[6] = 0;
-  ipv6addr->u8[7] = 0;
-  ipv6addr->u8[8] = 0;
-  ipv6addr->u8[9] = 0;
-  ipv6addr->u8[10] = 0xff;
-  ipv6addr->u8[11] = 0xff;
   ipv6addr->u8[12] = ipv4addr->u8[0];
   ipv6addr->u8[13] = ipv4addr->u8[1];
   ipv6addr->u8[14] = ipv4addr->u8[2];
@@ -90,21 +81,7 @@ ip64_addr_6to4(const uip_ip6addr_t *ipv6addr,
      returns 0 if it failed to convert the address and non-zero if it
      could successfully convert the address. */
 
-  /* If the IPv6 address is an IPv6-encoded
+  if(ip64_addr_is_ip64(ipv6addr)) {
-     IPv4 address (i.e. in the ::ffff:0/8 prefix), we simply use the
-     IPv4 addresses directly. */
-  if(ipv6addr->u8[0] == 0 &&
-     ipv6addr->u8[1] == 0 &&
-     ipv6addr->u8[2] == 0 &&
-     ipv6addr->u8[3] == 0 &&
-     ipv6addr->u8[4] == 0 &&
-     ipv6addr->u8[5] == 0 &&
-     ipv6addr->u8[6] == 0 &&
-     ipv6addr->u8[7] == 0 &&
-     ipv6addr->u8[8] == 0 &&
-     ipv6addr->u8[9] == 0 &&
-     ipv6addr->u8[10] == 0xff &&
-     ipv6addr->u8[11] == 0xff) {
     ipv4addr->u8[0] = ipv6addr->u8[12];
     ipv4addr->u8[1] = ipv6addr->u8[13];
     ipv4addr->u8[2] = ipv6addr->u8[14];
@@ -121,3 +98,16 @@ ip64_addr_6to4(const uip_ip6addr_t *ipv6addr,
   return 0;
 }
 /*---------------------------------------------------------------------------*/
+int
+ip64_addr_is_ip64(const uip_ip6addr_t *ipv6addr)
+{
+  return uip_ipaddr_prefixcmp(ipv6addr, &ip64_prefix, ip64_prefix_len);
+}
+/*---------------------------------------------------------------------------*/
+void
+ip64_addr_set_prefix(const uip_ip6addr_t *prefix, uint8_t prefix_len)
+{
+  uip_ipaddr_copy(&ip64_prefix, prefix);
+  ip64_prefix_len = prefix_len;
+}
+/*---------------------------------------------------------------------------*/

core/net/ip/ip64-addr.h

@@ -58,6 +58,9 @@ int ip64_addr_6to4(const uip_ip6addr_t *ipv6addr,
 int ip64_addr_4to6(const uip_ip4addr_t *ipv4addr,
 		   uip_ip6addr_t *ipv6addr);
 
+int ip64_addr_is_ip64(const uip_ip6addr_t *ipv6addr);
+
+void ip64_addr_set_prefix(const uip_ip6addr_t *prefix, uint8_t prefix_len);
 
 #endif /* IP64_ADDR_H */
 

core/net/ip64/ip64-dhcpc.c

@@ -163,7 +163,6 @@ create_msg(CC_REGISTER_ARG struct dhcp_msg *m)
   memset(&m->chaddr[s.mac_len], 0, sizeof(m->chaddr) - s.mac_len);
 
   memset(m->sname, 0, sizeof(m->sname));
-  strcpy((char *)m->sname, "Thingsquare");
   memset(m->file, 0, sizeof(m->file));
 
 

core/net/ip64/ip64-ipv4-dhcp.c

@@ -39,6 +39,9 @@
 
 #include <stdio.h>
 
+#define DEBUG DEBUG_NONE
+#include "net/ip/uip-debug.h"
+
 PROCESS(ip64_ipv4_dhcp_process, "IPv4 DHCP");
 
 uip_ipaddr_t uip_hostaddr; /* Needed because it is referenced by dhcpc.c */
@@ -48,7 +51,7 @@ uip_ipaddr_t uip_hostaddr; /* Needed because it is referenced by dhcpc.c */
 void
 ip64_ipv4_dhcp_init(void)
 {
-  printf("Starting DHCPv4\n");
+  printf("IP64: Starting DHCPv4\n");
   process_start(&ip64_ipv4_dhcp_process, NULL);
 }
 /*---------------------------------------------------------------------------*/
@@ -58,10 +61,10 @@ PROCESS_THREAD(ip64_ipv4_dhcp_process, ev, data)
 
   ip64_dhcpc_init(&ip64_eth_addr, sizeof(ip64_eth_addr));
 
-  printf("Inited\n");
+  PRINTF("IP64: Inited\n");
 
   ip64_dhcpc_request();
-  printf("Requested\n");
+  PRINTF("IP64: Requested\n");
   while(1) {
     PROCESS_WAIT_EVENT();
 
@@ -78,15 +81,22 @@ void
 ip64_dhcpc_configured(const struct ip64_dhcpc_state *s)
 {
   uip_ip6addr_t ip6dnsaddr;
-  printf("DHCP Configured with %d.%d.%d.%d\n",
+  PRINTF("IP64: DHCP Configured with %d.%d.%d.%d\n",
 	 s->ipaddr.u8[0], s->ipaddr.u8[1],
 	 s->ipaddr.u8[2], s->ipaddr.u8[3]);
 
   ip64_set_hostaddr((uip_ip4addr_t *)&s->ipaddr);
   ip64_set_netmask((uip_ip4addr_t *)&s->netmask);
   ip64_set_draddr((uip_ip4addr_t *)&s->default_router);
+  if(!uip_ip4addr_cmp((uip_ip4addr_t *)&s->dnsaddr, &uip_all_zeroes_addr)) {
+    /* Note: Currently we assume only one DNS server */
+    uip_ipaddr_t * dns = uip_nameserver_get(0);
+    /* Only update DNS entry if it is empty or already IPv4 */
+    if(uip_is_addr_unspecified(dns) || ip64_addr_is_ip64(dns)) {
       ip64_addr_4to6((uip_ip4addr_t *)&s->dnsaddr, &ip6dnsaddr);
-  //  mdns_conf(&ip6dnsaddr);
+      uip_nameserver_update(&ip6dnsaddr, uip_ntohs(s->lease_time[0])*65536ul + uip_ntohs(s->lease_time[1]));
+    }
+  }
 }
 /*---------------------------------------------------------------------------*/
 void