On Jul 15, 2013, at 9:27 PM 7/15/13, Alexander Aring <alex.ar...@gmail.com>
wrote:
> Some protocolls has a unspecific address as source address like
> "Multicast Listener Report Message v2" or "Neighbor Soliciation"
> decode the SAC bit as :: address.
I read RFC 6282 as specifying unspecified address with SAC == 1, SAM == 00.
Relevant code snippet from my other stack:
switch (ihc1 >> 4 & 7) {
/* snip */
case 4: /* SAC == 1, SAM == 0 */
memset (iptr->net_ipsrc, 0, 16);
break;
case 5: /* SAC == 1, SAM == 1 */
/* Context and 64 bits inline */
#ifdef DEBUG_RADIO
kprintf("no context-based address compression\n");
#endif
bptr += 8;
break;
/* snip */
- Ralph
>
> The header create part set this bit when a :: address is used.
>
> Signed-off-by: Alexander Aring <alex.ar...@gmail.com>
> ---
> net/ieee802154/6lowpan.c | 15 ++++++++++-----
> 1 file changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
> index 80f6f7b..197185c 100644
> --- a/net/ieee802154/6lowpan.c
> +++ b/net/ieee802154/6lowpan.c
> @@ -958,11 +958,16 @@ lowpan_process_data(struct sk_buff *skb)
> /* Extract SAM to the tmp variable */
> tmp = ((iphc1 & LOWPAN_IPHC_SAM) >> LOWPAN_IPHC_SAM_BIT) & 0x03;
>
> - /* Source address uncompression */
> - pr_debug("source address stateless compression\n");
> - err = lowpan_uncompress_addr(skb, &hdr.saddr, tmp, _saddr);
> - if (err)
> - goto drop;
> + if (iphc1 & LOWPAN_IPHC_SAC) {
> + /* TODO: implement this */
> + pr_debug("SAC bit is set. Set source address to: ::.\n");
> + } else {
> + /* Source address uncompression */
> + pr_debug("source address stateless compression\n");
> + err = lowpan_uncompress_addr(skb, &hdr.saddr, tmp, _saddr);
> + if (err)
> + goto drop;
> + }
>
> /* Extract DAM to the tmp variable */
> tmp = ((iphc1 & LOWPAN_IPHC_DAM_11) >> LOWPAN_IPHC_DAM_BIT) & 0x03;
> --
> 1.8.3.2
>
>
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