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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