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kernel: Do not treat IPv6 ULA's as GUA's (thanks Arne Meyer)

--- a/sys/src/9/ip/ipifc.c

+++ b/sys/src/9/ip/ipifc.c

@@ -70,6 +70,7 @@

 	unknownv6,		/* UGH */

 	unspecifiedv6,

 	linklocalv6,

+	ulav6,

 	globalv6,

 };

@@ -81,6 +82,8 @@

 	else if(islinklocal(addr) || ipcmp(addr, v6loopback) == 0 ||

 	    isv6mcast(addr) && (addr[1] & 0xF) <= Link_local_scop)

 		return linklocalv6;

+	else if(isula(addr))

+		return ulav6;

 	else

 		return globalv6;

 }

@@ -1218,7 +1221,7 @@

 }

 /*

- *  find "best" (global > link local > unspecified)

+ *  find "best" (global > ula > link local > unspecified)

  *  local address; address must be current.

  */

 static void

--- a/sys/src/9/ip/ipv6.h

+++ b/sys/src/9/ip/ipv6.h

@@ -16,6 +16,7 @@

  */

 #define isv6mcast(addr)	  ((addr)[0] == 0xff)

 #define islinklocal(addr) ((addr)[0] == 0xfe && ((addr)[1] & 0xc0) == 0x80)

+#define isula(addr)		  ((addr)[0] == 0xfd)

 #define optexsts(np)	(nhgets((np)->ploadlen) > 24)

 #define issmcast(addr)	(memcmp((addr), v6solicitednode, 13) == 0)