Basic support for IPv6. The system-dependent part doesn't work yet,

but the core routines are there and seem to be working.

   o  lib/ipv6.[ch] written
   o  Lexical analyser recognizes IPv6 addresses and when in IPv6
      mode, treats pure IPv4 addresses as router IDs.
   o  Router ID must be configured manually on IPv6 systems.
   o  Added SCOPE_ORGANIZATION for org-scoped IPv6 multicasts.
   o  Fixed few places where ipa_(hton|ntoh) was called as a function
      returning converted address.

conf/cf-lex.l

@@ -65,9 +65,25 @@ WHITE [ \t]
 %%
 
 {DIGIT}+\.{DIGIT}+\.{DIGIT}+\.{DIGIT}+ {
+#ifdef IPV6
+  if (ipv4_pton_u32(yytext, &cf_lval.i32))
+    return RTRID;
+  cf_error("Invalid IPv4 address %s", yytext);
+#else
   if (ip_pton(yytext, &cf_lval.a))
     return IPA;
-  cf_error("Invalid IP address");
+  cf_error("Invalid IP address %s", yytext);
+#endif
+}
+
+({XIGIT}*::|({XIGIT}*:){3,})({XIGIT}*|{DIGIT}+\.{DIGIT}+\.{DIGIT}+\.{DIGIT}+) {
+#ifdef IPV6
+  if (ip_pton(yytext, &cf_lval.a))
+    return IPA;
+  cf_error("Invalid IP address %s", yytext);
+#else
+  cf_error("This is an IPv4 router, therefore IPv6 addresses are not supported");
+#endif
 }
 
 0x{DIGIT}+ {

conf/conf.c

@@ -54,6 +54,10 @@ config_parse(struct config *c)
   cf_parse();
   filters_postconfig();			/* FIXME: Do we really need this? */
   protos_postconfig(c);
+#ifdef IPV6
+  if (!c->router_id)
+    cf_error("Router ID must be configured manually on IPv6 routers");
+#endif
   return 1;
 }
 

conf/confbase.Y

@@ -22,6 +22,7 @@ CF_DECLS
 
 %union {
   int i;
+  u32 i32;
   ip_addr a;
   struct symbol *s;
   char *t;
@@ -35,6 +36,7 @@ CF_DECLS
 
 %token END
 %token <i> NUM
+%token <i32> RTRID
 %token <a> IPA
 %token <s> SYM
 %token <t> TEXT