On Sun, Oct 11, 2020 at 12:11 PM Cong Wang <xiyou.wangc...@gmail.com> wrote:
>
> @@ -626,8 +626,7 @@ static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
>
> if (dev->header_ops) {
> /* Need space for new headers */
> - if (skb_cow_head(skb, dev->needed_headroom -
> - (tunnel->hlen + sizeof(struct iphdr))))
> + if (skb_cow_head(skb, dev->hard_header_len))
> goto free_skb;
>
> tnl_params = (const struct iphdr *)skb->data;
As I understand, the skb_cow functions are for ensuring enough header
space before skb->data. (Right?) However, at this stage our skb->data
is already at the outer IP header, I think we don't need to request
additional header space before the outer IP header.
