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6lowpan: iphc: fix stateful multicast compression 

In case of multicast address we need to set always the LOWPAN_IPHC_M bit
and if a destination context identifier was found for a multicast
address then we need to set the LOWPAN_IPHC_DAC as well.

Signed-off-by: Alexander Aring <aar@pengutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2016-02-24 12:01:03 +01:00 committed by Marcel Holtmann
parent ebba380cc9
commit 8790404de0
1 changed files with 2 additions and 1 deletions
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3
net/6lowpan/iphc.c
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@ -1118,12 +1118,13 @@ int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
/* destination address compression */
if (ipv6_daddr_type & IPV6_ADDR_MULTICAST) {
pr_debug("destination address is multicast: ");
iphc1 |= LOWPAN_IPHC_M;
if (dci) {
iphc1 |= lowpan_iphc_mcast_ctx_addr_compress(&hc_ptr,
&dci_entry,
&hdr->daddr);
iphc1 |= LOWPAN_IPHC_DAC;
} else {
iphc1 |= LOWPAN_IPHC_M;
iphc1 |= lowpan_iphc_mcast_addr_compress(&hc_ptr,
&hdr->daddr);
}