On Wed, 2017-11-01 at 10:27 -0700, Joe Smith wrote: > How strictly are references on the SKB enforced. For example, > tcp_transmit_skb() clones the SKB and adds a TCP header. Can I assume > that in case of re-transmission the header added will be there and can > be reused instead of creating a new one from scratch. Some fields like > time stamp would need to be updated but they should be unmodified.
Not sure what you are trying to do, but this seems messy ;) At rtx time, there is no guarantee that the master skb has not been changed, so the content of TCP header might be wrong anyway.
