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ieee802154: 6lowpan: add check for reserved dispatch

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This patch adds checks for reserved dispatch value. When we have a
reserved dispatch value we should drop the skb immediately.

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>
This commit is contained in:
Alexander Aring 2015-09-02 14:21:28 +02:00 committed by Marcel Holtmann
parent ad663600e1
commit c6fdbba3ea
1 changed files with 15 additions and 1 deletions
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16
net/ieee802154/6lowpan/rx.c
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@ -260,6 +260,19 @@ static inline bool lowpan_is_nalp(u8 dispatch)
return (dispatch & LOWPAN_DISPATCH_FIRST) == LOWPAN_DISPATCH_NALP;
}
/* Lookup for reserved dispatch values at:
* https://www.iana.org/assignments/_6lowpan-parameters/_6lowpan-parameters.xhtml#_6lowpan-parameters-1
*
* Last Updated: 2015-01-22
*/
static inline bool lowpan_is_reserved(u8 dispatch)
{
return ((dispatch >= 0x44 && dispatch <= 0x4F) ||
(dispatch >= 0x51 && dispatch <= 0x5F) ||
(dispatch >= 0xc8 && dispatch <= 0xdf) ||
(dispatch >= 0xe8 && dispatch <= 0xff));
}
/* lowpan_rx_h_check checks on generic 6LoWPAN requirements
* in MAC and 6LoWPAN header.
*
@ -271,7 +284,8 @@ static inline bool lowpan_rx_h_check(struct sk_buff *skb)
if (unlikely(!skb->len))
return false;
if (lowpan_is_nalp(*skb_network_header(skb)))
if (lowpan_is_nalp(*skb_network_header(skb)) ||
lowpan_is_reserved(*skb_network_header(skb)))
return false;
return true;