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gnrc_ipv6_nib: use static DNS server from auto_init_sock_dns if present

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This commit is contained in:
Benjamin Valentin 2023-01-27 19:10:20 +01:00
parent acf2074369
commit ff52d35584
2 changed files with 7 additions and 1 deletions
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5
examples/gnrc_border_router/Makefile
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@ -67,6 +67,11 @@ else ifeq (static,$(PREFIX_CONF))
# Only set this if the default router does not send router advertisements
# IPV6_DEFAULT_ROUTER ?= fe80::1
USEMODULE += gnrc_ipv6_static_addr
# configure static DNS server
ifneq (,$(filter sock_dns,$(USEMODULE)))
USEMODULE += auto_init_sock_dns
endif
endif
# Comment this out to disable code in RIOT that does safety checking

3
sys/net/gnrc/network_layer/ipv6/nib/_nib-router.c
View File

@ -155,7 +155,8 @@ static gnrc_pktsnip_t *_build_ext_opts(gnrc_netif_t *netif,
uint32_t rdnss_ltime = _evtimer_lookup(&sock_dns_server,
GNRC_IPV6_NIB_RDNSS_TIMEOUT);
if ((rdnss_ltime < UINT32_MAX) &&
/* with auto_init_sock_dns we always have a valid (static) DNS server */
if (((rdnss_ltime < UINT32_MAX) || IS_USED(MODULE_AUTO_INIT_SOCK_DNS)) &&
(!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,