Handle context based address when a unspecific address is specified.
For other context based address we print a warning and drop the package
currently because we don't support it right now.
Signed-off-by: Alexander Aring <alex.ar...@gmail.com>
---
net/ieee802154/6lowpan.c | 54 +++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 49 insertions(+), 5 deletions(-)
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 5de520b..a3c722a 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -247,6 +247,41 @@ lowpan_uncompress_addr(struct sk_buff *skb,
}
/*
+ * 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;
+ }
+
+ pr_debug("Reconstructed context based ipv6 src addr is:\n");
+ lowpan_raw_dump_inline(NULL, NULL, ipaddr->s6_addr, 16);
+
+ return 0;
+}
+
+/*
* Uncompress function for multicast destination address,
* when M bit is set.
*/
@@ -981,11 +1016,20 @@ 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) {
+ /* 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);
+ if (err)
+ goto drop;
+ } 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;
--
1.8.3.3
------------------------------------------------------------------------------
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