From: Jo-Philipp Wich <jo@mein.io>
Date: Wed, 22 Sep 2021 07:55:07 +0000 (+0200)
Subject: rpcd-mod-luci: avoid PTR requests for IPv6 link-local and ULA addrs
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=ba3f8f84ad0b45ecbd2ad2c6e8c0836c3727348b;p=project%2Fluci.git

rpcd-mod-luci: avoid PTR requests for IPv6 link-local and ULA addrs

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
(cherry picked from commit 45a398e1ed86c9706d47ff46be73bdaa303ff661)
---

diff --git a/libs/rpcd-mod-luci/src/luci.c b/libs/rpcd-mod-luci/src/luci.c
index b89bca494d..53ffff4fd2 100644
--- a/libs/rpcd-mod-luci/src/luci.c
+++ b/libs/rpcd-mod-luci/src/luci.c
@@ -52,6 +52,10 @@
 
 #include <rpcd/plugin.h>
 
+#ifndef IN6_IS_ADDR_ULA
+#define IN6_IS_ADDR_ULA(a) (((a)->s6_addr[0] & 0xfe) == 0xfc)
+#endif
+
 
 static struct blob_buf blob;
 
@@ -1720,7 +1724,9 @@ rpc_luci_get_host_hints_rrdns(struct reply_context *rctx)
 			}
 		}
 		avl_for_each_element(&hint->ip6addrs, addr, avl) {
-			if (!IN6_IS_ADDR_UNSPECIFIED(&addr->addr.in6)) {
+			if (!IN6_IS_ADDR_UNSPECIFIED(&addr->addr.in6) &&
+			    !IN6_IS_ADDR_LINKLOCAL(&addr->addr.in6) &&
+			    !IN6_IS_ADDR_ULA(&addr>addr.in6)) {
 				inet_ntop(AF_INET6, &addr->addr.in6, buf, sizeof(buf));
 				blobmsg_add_string(&req, NULL, buf);
 				n++;