On Wed, 08 Oct 2003 09:34:20 -0700 Ben Greear <greearb@xxxxxxxxxxxxxxx> wrote: > So, what good is skb_share_check then? > Maybe we should have a skb_share_or_cloned_check() ? What input handlers are supposed to do is first: skb = skb_share_check(...); then look at packet contents etc., then if they need to write to the header do something like skb_cow(). The best example, as usual, is ipv4 input. Look at how ip_rcv() makes sure it can safely get at the packet header parts it needs to parse, then look at ip_forward and how it cows the IPV4 header so it can modify the TTL field.
