From 3b9c86146616a2bfbeeb38db4679d84e7002f352 Mon Sep 17 00:00:00 2001
From: Michael R Rosen <michael.r.rosen@intel.com>
Date: Fri, 1 Mar 2019 17:36:46 -0800
Subject: [PATCH] ipv6: fix ndp dns option to work with esp-idf

---
 src/core/ipv6/nd6.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/core/ipv6/nd6.c b/src/core/ipv6/nd6.c
index 0b03ee840..2c4f04258 100644
--- a/src/core/ipv6/nd6.c
+++ b/src/core/ipv6/nd6.c
@@ -562,8 +562,13 @@ nd6_input(struct pbuf *p, struct netif *inp)
             /* TODO implement DNS removal in dns.c */
             u8_t s;
             for (s = 0; s < DNS_MAX_SERVERS; s++) {
+#ifdef ESP_LWIP
+              ip_addr_t addr = dns_getserver(s);
+              if(ip_addr_cmp(&addr, &rdnss_address)) {
+#else
               const ip_addr_t *addr = dns_getserver(s);
               if(ip_addr_cmp(addr, &rdnss_address)) {
+#endif
                 dns_setserver(s, NULL);
               }
             }