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    SubjectRe: TCP bug?
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    Date
    In article <E0zYBw8-0006Xy-00@danube.inka.de>,
    Olaf Titz <olaf@bigred.inka.de> writes:
    >> skb_unshare is a copy on write for multiple users. So 99.99% of the time it
    >> actually just returns skb.

    > OK. Because it can happen that I need to copy the skb for another
    > reason (too little space for additional headers) I can just do
    > something like

    > if (skb_cloned(skb) || toosmall(skb)) {
    > skn = skb_copy(skb, GFP_KERNEL);
    > /* etc */
    > }

    skb_cow does exactly what you want:
    struct sk_buff *skb_cow(struct sk_buff *skb, unsigned int headroom);


    -Andi



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