> And the copy is necessary because you need more tailroom or something? > > I don't understand why simply having all the space you need is not > better and faster :-) > > Even if you have a clone, you can muck with the data in the IP and TCP > header areas, so long as skb_header_cloned() is false. I think it's probably all because I don't understand skb_cloned() vs. skb_header_cloned() and mac80211 came with checks for skb_cloned() that I didn't spot. So you're saying the check there to see if we can add 802.11 headers should depend on skb_header_cloned() and not skb_cloned()? > So I can only conclude that your problematic case is that of > encryption, right? That's the only situation where I can imagine you > need to modify with packet data outside of the protocol headers. When is protocol header equivalent to skb header and when not? johannes
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