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authorAlexander Aring <alex.aring@gmail.com>2015-09-02 14:21:25 +0200
committerMarcel Holtmann <marcel@holtmann.org>2015-09-17 13:20:03 +0200
commit72a5e6bb5120d6464c9e7855c5a22555ede819dc (patch)
tree14be5cd534bf3e6d7043cfd2f9d08c24b7028419 /net/6lowpan/nhc_udp.c
parentieee802154: 6lowpan: earlier skb->dev switch (diff)
downloadlinux-72a5e6bb5120d6464c9e7855c5a22555ede819dc.tar.xz
linux-72a5e6bb5120d6464c9e7855c5a22555ede819dc.zip
ieee820154: 6lowpan: dispatch evaluation rework
This patch complete reworks the evaluation of 6lowpan dispatch value by introducing a receive handler mechanism for each dispatch value. A list of changes: - Doing uncompression on-the-fly when FRAG1 is received, this require some special handling for 802.15.4 lltype in generic 6lowpan branch for setting the payload length correct. - Fix dispatch mask for fragmentation. - Add IPv6 dispatch evaluation for FRAG1. - Add skb_unshare for dispatch which might manipulate the skb data buffer. Cc: Jukka Rissanen <jukka.rissanen@linux.intel.com> Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com> Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/6lowpan/nhc_udp.c')
-rw-r--r--net/6lowpan/nhc_udp.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/net/6lowpan/nhc_udp.c b/net/6lowpan/nhc_udp.c
index c6bcaeb428ae..72d0b57eb6e5 100644
--- a/net/6lowpan/nhc_udp.c
+++ b/net/6lowpan/nhc_udp.c
@@ -71,7 +71,18 @@ static int udp_uncompress(struct sk_buff *skb, size_t needed)
* here, we obtain the hint from the remaining size of the
* frame
*/
- uh.len = htons(skb->len + sizeof(struct udphdr));
+ switch (lowpan_priv(skb->dev)->lltype) {
+ case LOWPAN_LLTYPE_IEEE802154:
+ if (lowpan_802154_cb(skb)->d_size)
+ uh.len = htons(lowpan_802154_cb(skb)->d_size -
+ sizeof(struct ipv6hdr));
+ else
+ uh.len = htons(skb->len + sizeof(struct udphdr));
+ break;
+ default:
+ uh.len = htons(skb->len + sizeof(struct udphdr));
+ break;
+ }
pr_debug("uncompressed UDP length: src = %d", ntohs(uh.len));
/* replace the compressed UDP head by the uncompressed UDP