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ndp: provide define for common hop-limit

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This commit is contained in:
Martine Lenders 2019-02-14 08:18:21 +01:00
parent 9319c320d8
commit 06e244c963
3 changed files with 26 additions and 10 deletions
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12
sys/include/net/ndp.h
View File

@ -193,6 +193,18 @@ extern "C" {
#define NDP_MAX_RANDOM_FACTOR (1500U) /**< MAX_RANDOM_FACTOR (x 1000) */
/** @} */
/**
* @brief Hop-limit required for most NDP messages to ensure link-local
* communication
*
* @see [RFC 4861, section 4.1](https://tools.ietf.org/html/rfc4861#section-4.1)
* @see [RFC 4861, section 4.2](https://tools.ietf.org/html/rfc4861#section-4.2)
* @see [RFC 4861, section 4.3](https://tools.ietf.org/html/rfc4861#section-4.3)
* @see [RFC 4861, section 4.4](https://tools.ietf.org/html/rfc4861#section-4.4)
* @see [RFC 4861, section 4.5](https://tools.ietf.org/html/rfc4861#section-4.5)
*/
#define NDP_HOP_LIMIT (255U)
/**
* @brief Router solicitation message format.
* @extends icmpv6_hdr_t

22
sys/net/gnrc/network_layer/ipv6/nib/nib.c
View File

@ -440,12 +440,13 @@ static void _handle_rtr_sol(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
assert(netif != NULL);
/* check validity, see: https://tools.ietf.org/html/rfc4861#section-6.1.1 */
/* checksum is checked by GNRC's ICMPv6 module */
if (!(gnrc_netif_is_rtr(netif)) || (ipv6->hl != 255U) ||
if (!(gnrc_netif_is_rtr(netif)) || (ipv6->hl != NDP_HOP_LIMIT) ||
(rtr_sol->code != 0U) || (icmpv6_len < sizeof(ndp_rtr_sol_t))) {
DEBUG("nib: Received router solicitation is invalid (or interface %i "
"is not a forwarding interface). Discarding silently\n",
netif->pid);
DEBUG(" - IP Hop Limit: %u (should be 255)\n", ipv6->hl);
DEBUG(" - IP Hop Limit: %u (should be %u)\n", ipv6->hl,
NDP_HOP_LIMIT);
DEBUG(" - ICMP code: %u (should be 0)\n", rtr_sol->code);
DEBUG(" - ICMP length: %u (should > %u)\n", (unsigned)icmpv6_len,
(unsigned)sizeof(ndp_rtr_sol_t));
@ -549,13 +550,14 @@ static void _handle_rtr_adv(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
/* check validity, see: https://tools.ietf.org/html/rfc4861#section-6.1.1 */
/* checksum is checked by GNRC's ICMPv6 module */
if (!(ipv6_addr_is_link_local(&ipv6->src)) ||
(ipv6->hl != 255U) || (rtr_adv->code != 0U) ||
(ipv6->hl != NDP_HOP_LIMIT) || (rtr_adv->code != 0U) ||
(icmpv6_len < sizeof(ndp_rtr_adv_t)) ||
(!gnrc_netif_is_6ln(netif) &&
(byteorder_ntohs(rtr_adv->ltime) > NDP_RTR_ADV_LTIME_SEC_MAX))) {
DEBUG("nib: Received router advertisement is invalid. "
"Discarding silently\n");
DEBUG(" - IP Hop Limit: %u (should be 255)\n", ipv6->hl);
DEBUG(" - IP Hop Limit: %u (should be %u)\n", ipv6->hl,
NDP_HOP_LIMIT);
DEBUG(" - ICMP code: %u (should be 0)\n", rtr_adv->code);
DEBUG(" - ICMP length: %u (should > %u)\n", (unsigned)icmpv6_len,
(unsigned)sizeof(ndp_rtr_adv_t));
@ -819,7 +821,7 @@ static void _send_delayed_nbr_adv(const gnrc_netif_t *netif,
if ((payload = _check_release_pkt(pkt, payload)) == NULL) {
return;
}
((ipv6_hdr_t *)payload->data)->hl = 255;
((ipv6_hdr_t *)payload->data)->hl = NDP_HOP_LIMIT;
pkt = gnrc_netif_hdr_build(NULL, 0, NULL, 0);
if ((pkt = _check_release_pkt(pkt, payload)) == NULL) {
return;
@ -839,13 +841,14 @@ static void _handle_nbr_sol(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
/* check validity, see: https://tools.ietf.org/html/rfc4861#section-7.1.1 */
/* checksum is checked by GNRC's ICMPv6 module */
if ((ipv6->hl != 255U) || (nbr_sol->code != 0U) ||
if ((ipv6->hl != NDP_HOP_LIMIT) || (nbr_sol->code != 0U) ||
(icmpv6_len < sizeof(ndp_nbr_sol_t)) ||
ipv6_addr_is_multicast(&nbr_sol->tgt) ||
(ipv6_addr_is_unspecified(&ipv6->src) &&
!ipv6_addr_is_solicited_node(&ipv6->dst))) {
DEBUG("nib: Received neighbor solicitation is invalid. Discarding silently\n");
DEBUG(" - IP Hop Limit: %u (should be 255)\n", ipv6->hl);
DEBUG(" - IP Hop Limit: %u (should be %u)\n", ipv6->hl,
NDP_HOP_LIMIT);
DEBUG(" - ICMP code: %u (should be 0)\n", nbr_sol->code);
DEBUG(" - ICMP length: %u (should > %u)\n", (unsigned)icmpv6_len,
(unsigned)sizeof(ndp_nbr_sol_t));
@ -972,13 +975,14 @@ static void _handle_nbr_adv(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
/* check validity, see: https://tools.ietf.org/html/rfc4861#section-7.1.2 */
/* checksum is checked by GNRC's ICMPv6 module */
if ((ipv6->hl != 255U) || (nbr_adv->code != 0U) ||
if ((ipv6->hl != NDP_HOP_LIMIT) || (nbr_adv->code != 0U) ||
(icmpv6_len < sizeof(ndp_nbr_adv_t)) ||
ipv6_addr_is_multicast(&nbr_adv->tgt) ||
(ipv6_addr_is_multicast(&ipv6->dst) &&
(nbr_adv->flags & NDP_NBR_ADV_FLAGS_S))) {
DEBUG("nib: Received neighbor advertisement is invalid. Discarding silently\n");
DEBUG(" - IP Hop Limit: %u (should be 255)\n", ipv6->hl);
DEBUG(" - IP Hop Limit: %u (should be %u)\n", ipv6->hl,
NDP_HOP_LIMIT);
DEBUG(" - ICMP code: %u (should be 0)\n", nbr_adv->code);
DEBUG(" - ICMP length: %u (should > %u)\n", (unsigned)icmpv6_len,
(unsigned)sizeof(ndp_nbr_adv_t));

2
sys/net/gnrc/network_layer/ndp/gnrc_ndp.c
View File

@ -601,7 +601,7 @@ static gnrc_pktsnip_t *_build_headers(gnrc_netif_t *netif,
DEBUG("ndp: error allocating IPv6 header.\n");
return NULL;
}
((ipv6_hdr_t *)iphdr->data)->hl = 255;
((ipv6_hdr_t *)iphdr->data)->hl = NDP_HOP_LIMIT;
/* add netif header for send interface specification */
l2hdr = gnrc_netif_hdr_build(NULL, 0, NULL, 0);
if (l2hdr == NULL) {