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ieee820154: 6lowpan: dispatch evaluation rework

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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 <[email protected]>
Reviewed-by: Stefan Schmidt <[email protected]>
Signed-off-by: Alexander Aring <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>
This commit is contained in:
Alexander Aring 2015-09-02 14:21:25 +02:00 • committed by Marcel Holtmann
commit 72a5e6bb51
6 changed files with 288 additions and 111 deletions
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13
net/6lowpan/iphc.c
View file

@ -366,7 +366,18 @@ lowpan_header_decompress(struct sk_buff *skb, struct net_device *dev,
return err;
}
hdr.payload_len = htons(skb->len);
switch (lowpan_priv(dev)->lltype) {
case LOWPAN_LLTYPE_IEEE802154:
if (lowpan_802154_cb(skb)->d_size)
hdr.payload_len = htons(lowpan_802154_cb(skb)->d_size -
sizeof(struct ipv6hdr));
else
hdr.payload_len = htons(skb->len);
break;
default:
hdr.payload_len = htons(skb->len);
break;
}
pr_debug("skb headroom size = %d, data length = %d\n",
skb_headroom(skb), skb->len);

13
net/6lowpan/nhc_udp.c
View file

@ -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