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Commit 573701ce authored Dec 17, 2013 by Alexander Aring Committed by Marcel Holtmann Dec 17, 2013

6lowpan: add udp warning for elided checksum

Bit 5 of "UDP LOWPAN_NHC Format" indicate that the checksum can be
elided.
The host need to calculate the udp checksum afterwards but this isn't
supported right now.

See:
http://tools.ietf.org/html/rfc6282#section-4.3.3


Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

parent e5d966ef

net/ieee802154/6lowpan.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -231,6 +231,7 @@
		#define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline,
		dest = 16 bit inline */
		#define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */
		#define LOWPAN_NHC_UDP_CS_C 0x04 /* checksum elided */

		#ifdef DEBUG
		/* print data in line */

net/ieee802154/6lowpan_iphc.c

+8 −3

Original line number	Diff line number	Diff line
		@@ -309,9 +309,14 @@ uncompress_udp_header(struct sk_buff skb, struct udphdr uh)
		pr_debug("uncompressed UDP ports: src = %d, dst = %d\n",
		ntohs(uh->source), ntohs(uh->dest));

		/* copy checksum */
		/* checksum */
		if (tmp & LOWPAN_NHC_UDP_CS_C) {
		pr_debug_ratelimited("checksum elided currently not supported\n");
		goto err;
		} else {
		memcpy(&uh->check, &skb->data[0], 2);
		skb_pull(skb, 2);
		}

		/*
		* UDP lenght needs to be infered from the lower layers