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gnrc_ndp: add support for building RDNSS option

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This commit is contained in:
Martine Lenders 2018-02-26 17:34:43 +01:00 committed by Martine Lenders
parent fbf216f864
commit 0ef62b9690
5 changed files with 65 additions and 0 deletions
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7
Makefile.dep
View File

@ -305,6 +305,10 @@ ifneq (,$(filter gnrc_ipv6_nib_6ln,$(USEMODULE)))
USEMODULE += gnrc_sixlowpan_nd
endif
ifneq (,$(filter gnrc_ipv6_nib_dns,$(USEMODULE)))
USEMODULE += gnrc_ipv6_nib
endif
ifneq (,$(filter gnrc_ipv6_nib_router,$(USEMODULE)))
USEMODULE += gnrc_ipv6_nib
endif
@ -315,6 +319,9 @@ ifneq (,$(filter gnrc_ipv6_nib,$(USEMODULE)))
USEMODULE += gnrc_netif
USEMODULE += ipv6_addr
USEMODULE += random
ifneq (,$(filter sock_dns,$(USEMODULE)))
USEMODULE += gnrc_ipv6_nib_dns
endif
endif
ifneq (,$(filter gnrc_udp,$(USEMODULE)))

1
makefiles/pseudomodules.inc.mk
View File

@ -17,6 +17,7 @@ PSEUDOMODULES += gnrc_ipv6_router_default
PSEUDOMODULES += gnrc_ipv6_nib_6lbr
PSEUDOMODULES += gnrc_ipv6_nib_6ln
PSEUDOMODULES += gnrc_ipv6_nib_6lr
PSEUDOMODULES += gnrc_ipv6_nib_dns
PSEUDOMODULES += gnrc_ipv6_nib_router
PSEUDOMODULES += gnrc_netdev_default
PSEUDOMODULES += gnrc_neterr

13
sys/include/net/gnrc/ipv6/nib/conf.h
View File

@ -68,6 +68,10 @@ extern "C" {
#define GNRC_IPV6_NIB_CONF_ROUTER (1)
#endif
#ifdef MODULE_GNRC_IPV6_NIB_DNS
#define GNRC_IPV6_NIB_CONF_DNS (1)
#endif
/**
* @name Compile flags
* @brief Compile flags to (de-)activate certain features for NIB
@ -171,6 +175,15 @@ extern "C" {
#endif
#endif
/**
* @brief Support for DNS configuration options
*
* @see [RFC 8106](https://tools.ietf.org/html/rfc8106)
*/
#ifndef GNRC_IPV6_NIB_CONF_DNS
#define GNRC_IPV6_NIB_CONF_DNS (0)
#endif
/**
* @brief Multihop prefix and 6LoWPAN context distribution
*

23
sys/include/net/gnrc/ndp.h
View File

@ -250,6 +250,29 @@ gnrc_pktsnip_t *gnrc_ndp_opt_pi_build(const ipv6_addr_t *prefix,
*/
gnrc_pktsnip_t *gnrc_ndp_opt_mtu_build(uint32_t mtu, gnrc_pktsnip_t *next);
/**
* @brief Builts the recursive DNS server option
*
* @see [RFC 8106, section 5.1](https://tools.ietf.org/html/rfc8106#section-5.1)
* @pre `addrs != NULL`
* @pre `addrs_num > 0`
*
* @note Should only be used with router advertisemnents. This is not checked
* however, since nodes should silently ignore it in other NDP messages.
*
* @param[in] lifetime The lifetime of the recursive DNS servers
* @param[in] addrs The addresses of the recursive DNS servers
* @param[in] addrs_num The number of addresses in @p addrs
* @param[in] next More options in the packet. NULL, if there are none.
*
* @return The packet snip list of options, on success
* @return @p next, if RDNSS is not supported
* @return NULL, if packet buffer is full
*/
gnrc_pktsnip_t *gnrc_ndp_opt_rdnss_build(uint32_t lifetime, ipv6_addr_t *addrs,
unsigned addrs_num,
gnrc_pktsnip_t *next);
/**
* @brief Send pre-compiled neighbor solicitation depending on a given network
* interface.

21
sys/net/gnrc/network_layer/ndp/gnrc_ndp.c
View File

@ -222,6 +222,27 @@ gnrc_pktsnip_t *gnrc_ndp_opt_mtu_build(uint32_t mtu, gnrc_pktsnip_t *next)
return pkt;
}
gnrc_pktsnip_t *gnrc_ndp_opt_rdnss_build(uint32_t ltime, ipv6_addr_t *addrs,
unsigned addrs_num,
gnrc_pktsnip_t *next)
{
assert(addrs != NULL);
assert(addrs_num > 0);
size_t opt_size = sizeof(ndp_opt_t) + (sizeof(ipv6_addr_t) * addrs_num);
gnrc_pktsnip_t *pkt = gnrc_ndp_opt_build(NDP_OPT_RDNSS, opt_size, next);
if (pkt != NULL) {
ndp_opt_rdnss_t *rdnss_opt = pkt->data;
rdnss_opt->resv.u16 = 0;
rdnss_opt->ltime = byteorder_htonl(ltime);
for (unsigned i = 0; i < addrs_num; i++) {
memcpy(&rdnss_opt->addrs[i], &addrs[i],
sizeof(rdnss_opt->addrs[i]));
}
}
return pkt;
}
static gnrc_pktsnip_t *_build_headers(gnrc_netif_t *netif,
const ipv6_addr_t *src,
const ipv6_addr_t *dst,