ieee802154: 6lowpan: add check for reserved dispatch
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>
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@ -260,6 +260,19 @@ static inline bool lowpan_is_nalp(u8 dispatch)
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return (dispatch & LOWPAN_DISPATCH_FIRST) == LOWPAN_DISPATCH_NALP;
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}
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/* Lookup for reserved dispatch values at:
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* https://www.iana.org/assignments/_6lowpan-parameters/_6lowpan-parameters.xhtml#_6lowpan-parameters-1
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*
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* Last Updated: 2015-01-22
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*/
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static inline bool lowpan_is_reserved(u8 dispatch)
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{
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return ((dispatch >= 0x44 && dispatch <= 0x4F) ||
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(dispatch >= 0x51 && dispatch <= 0x5F) ||
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(dispatch >= 0xc8 && dispatch <= 0xdf) ||
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(dispatch >= 0xe8 && dispatch <= 0xff));
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}
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/* lowpan_rx_h_check checks on generic 6LoWPAN requirements
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* in MAC and 6LoWPAN header.
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*
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@ -271,7 +284,8 @@ static inline bool lowpan_rx_h_check(struct sk_buff *skb)
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if (unlikely(!skb->len))
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return false;
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if (lowpan_is_nalp(*skb_network_header(skb)))
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if (lowpan_is_nalp(*skb_network_header(skb)) ||
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lowpan_is_reserved(*skb_network_header(skb)))
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return false;
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return true;
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