From 1916c45dc0eea23685f07b7a00569b0fc8917fb3 Mon Sep 17 00:00:00 2001
From: Martine Lenders <m.lenders@fu-berlin.de>
Date: Mon, 26 Feb 2018 17:36:09 +0100
Subject: [PATCH] gnrc_ipv6_nib_router: add support to send RDNSSO
---
.../gnrc/network_layer/ipv6/nib/_nib-router.c | 23 +++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c b/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
index 5873b09903..9b2bd14bc3 100644
--- a/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
+++ b/sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
@@ -17,6 +17,9 @@
#include "net/gnrc/ndp.h"
#include "net/gnrc/netif/internal.h"
#include "net/gnrc/sixlowpan/nd.h"
+#if GNRC_IPV6_NIB_CONF_DNS
+#include "net/sock/dns.h"
+#endif
#if GNRC_IPV6_NIB_CONF_MULTIHOP_P6C
#include "_nib-6ln.h"
@@ -131,6 +134,26 @@ static gnrc_pktsnip_t *_build_ext_opts(gnrc_netif_t *netif,
_nib_offl_entry_t *pfx = NULL;
unsigned id = netif->pid;
+#if GNRC_IPV6_NIB_CONF_DNS && SOCK_HAS_IPV6
+ uint32_t rdnss_ltime = _evtimer_lookup(&sock_dns_server,
+ GNRC_IPV6_NIB_RDNSS_TIMEOUT);
+
+ if ((rdnss_ltime < UINT32_MAX) &&
+ (!ipv6_addr_is_link_local((ipv6_addr_t *)sock_dns_server.addr.ipv6))) {
+ gnrc_pktsnip_t *rdnsso = gnrc_ndp_opt_rdnss_build(
+ rdnss_ltime * MS_PER_SEC,
+ (ipv6_addr_t *)&sock_dns_server.addr,
+ 1U, ext_opts
+ );
+ if (rdnsso == NULL) {
+ /* gnrc_ndp_opt_rdnss_build() only returns NULL when pktbuf is full
+ * in this configuration */
+ DEBUG("nib: No space left in packet buffer. Not adding RDNSSO\n");
+ return NULL;
+ }
+ ext_opts = rdnsso;
+ }
+#endif /* GNRC_IPV6_NIB_CONF_DNS */
#if GNRC_IPV6_NIB_CONF_MULTIHOP_P6C
uint16_t ltime;
gnrc_pktsnip_t *abro;
--
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