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Commit 65d892c8 authored by Alexander Aring's avatar Alexander Aring Committed by David S. Miller
Browse files

6lowpan: handle context based source address 



Handle context based address when an unspecified address is given.
For other context based address we print a warning and drop the packet
because we don't support it right now.

Signed-off-by: default avatarAlexander Aring <alex.aring@gmail.com>
Reviewed-by: default avatarWerner Almesberger <werner@almesberger.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ce2463b2

net/ieee802154/6lowpan.c

+46 −3
Original line number Diff line number Diff line
@@ -242,6 +242,40 @@ lowpan_uncompress_addr(struct sk_buff *skb, 
	return 0;

}



/* Uncompress address function for source context

 * based address(non-multicast).

 */

static int

lowpan_uncompress_context_based_src_addr(struct sk_buff *skb,

		struct in6_addr *ipaddr,

		const u8 sam)

{

	switch (sam) {

	case LOWPAN_IPHC_ADDR_00:

		/* unspec address ::

		 * Do nothing, address is already ::

		 */

		break;

	case LOWPAN_IPHC_ADDR_01:

		/* TODO */

	case LOWPAN_IPHC_ADDR_02:

		/* TODO */

	case LOWPAN_IPHC_ADDR_03:

		/* TODO */

		netdev_warn(skb->dev, "SAM value 0x%x not supported\n", sam);

		return -EINVAL;

	default:

		pr_debug("Invalid sam value: 0x%x\n", sam);

		return -EINVAL;

	}



	lowpan_raw_dump_inline(NULL,

			"Reconstructed context based ipv6 src addr is:\n",

			ipaddr->s6_addr, 16);



	return 0;

}



/* Uncompress function for multicast destination address,

 * when M bit is set.

 */
@@ -970,9 +1004,18 @@ lowpan_process_data(struct sk_buff *skb) 
	/* Extract SAM to the tmp variable */

	tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;



	if (iphc1 & LOWPAN_IPHC_SAC) {

		/* Source address context based uncompression */

		pr_debug("SAC bit is set. Handle context based source address.\n");

		err = lowpan_uncompress_context_based_src_addr(

				skb, &hdr.saddr, tmp);

	} else {

		/* Source address uncompression */

		pr_debug("source address stateless compression\n");

		err = lowpan_uncompress_addr(skb, &hdr.saddr, tmp, _saddr);

	}



	/* Check on error of previous branch */

	if (err)

		goto drop;