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udp: discard UDP packets with zero checksum.

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RFC 2460 Section 8.1

> IPv6 receivers must discard UDP packets containing a zero checksum,
> and should log the error.
This commit is contained in:
Yonezawa-T2 2016-02-22 20:36:14 +09:00
parent e92c355aba
commit b1dd2818fe
1 changed files with 9 additions and 0 deletions
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9
sys/net/gnrc/transport_layer/udp/gnrc_udp.c
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@ -137,6 +137,15 @@ static void _receive(gnrc_pktsnip_t *pkt)
hdr = (udp_hdr_t *)udp->data;
/* validate checksum */
if (byteorder_ntohs(hdr->checksum) == 0) {
/* RFC 2460 Section 8.1
* "IPv6 receivers must discard UDP packets containing a zero checksum,
* and should log the error."
*/
DEBUG("udp: received packet with zero checksum, dropping it\n");
gnrc_pktbuf_release(pkt);
return;
}
if (_calc_csum(udp, ipv6, pkt) != 0xFFFF) {
DEBUG("udp: received packet with invalid checksum, dropping it\n");
gnrc_pktbuf_release(pkt);