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gnrc_ipv6: fix hop-limit == 0 case

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This commit is contained in:
Martine Lenders 2018-12-06 15:09:44 +01:00
parent b6abbad6fb
commit bc7d083094
1 changed files with 10 additions and 0 deletions
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10
sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c
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@ -811,6 +811,16 @@ static void _receive(gnrc_pktsnip_t *pkt)
/* extract header */ /* extract header */
hdr = (ipv6_hdr_t *)ipv6->data; hdr = (ipv6_hdr_t *)ipv6->data;
if (hdr->hl == 0) {
/* This is an illegal value in any case, not just in case of a
* forwarding step, so *do not* check it together with ((--hdr->hl) > 0)
* in forwarding code below */
DEBUG("ipv6: packet was received with hop-limit 0\n");
gnrc_icmpv6_error_time_exc_send(ICMPV6_ERROR_TIME_EXC_HL, pkt);
gnrc_pktbuf_release_error(pkt, ETIMEDOUT);
return;
}
uint16_t ipv6_len = byteorder_ntohs(hdr->len); uint16_t ipv6_len = byteorder_ntohs(hdr->len);
if ((ipv6_len == 0) && (hdr->nh != PROTNUM_IPV6_NONXT)) { if ((ipv6_len == 0) && (hdr->nh != PROTNUM_IPV6_NONXT)) {