Re: [PATCH ipsec] esp4: support ipv6 nexthdrs process for beet gso segment

[Xin Long <lucien.xin@gmail.com>]

On Fri, Apr 10, 2020 at 5:08 PM Xin Long <lucien.xin@gmail.com> wrote:
>
> For beet mode, when it's ipv6 inner address with nexthdrs set,
> the packet format might be:
>
>     ----------------------------------------------------
>     | outer  |     | dest |     |      |  ESP    | ESP |
>     | IP hdr | ESP | opts.| TCP | Data | Trailer | ICV |
>     ----------------------------------------------------
>
> Before doing gso segment in xfrm4_beet_gso_segment(), the same
> thing is needed as it does in xfrm6_beet_gso_segment() in last
> patch 'esp6: support ipv6 nexthdrs process for beet gso segment'.
>
> Fixes: 384a46ea7bdc ("esp4: add gso_segment for esp4 beet mode")
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
> ---
>  net/ipv4/esp4_offload.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
> index 731022c..9dde4e3 100644
> --- a/net/ipv4/esp4_offload.c
> +++ b/net/ipv4/esp4_offload.c
> @@ -139,7 +139,7 @@ static struct sk_buff *xfrm4_beet_gso_segment(struct xfrm_state *x,
>         struct xfrm_offload *xo = xfrm_offload(skb);
>         struct sk_buff *segs = ERR_PTR(-EINVAL);
>         const struct net_offload *ops;
> -       int proto = xo->proto;
> +       u8 proto = xo->proto;
>
>         skb->transport_header += x->props.header_len;
>
> @@ -148,10 +148,16 @@ static struct sk_buff *xfrm4_beet_gso_segment(struct xfrm_state *x,
>
>                 skb->transport_header += ph->hdrlen * 8;
>                 proto = ph->nexthdr;
> -       } else if (x->sel.family != AF_INET6) {
> +       } else if (x->sel.family == AF_INET6) {
> +               int offset = skb_transport_offset(skb);
> +               __be16 frag;
> +
> +               offset = ipv6_skip_exthdr(skb, offset, &proto, &frag);
> +               skb->transport_header += offset;
And this one too.

> +               if (proto == IPPROTO_TCP)
> +                       skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
> +       } else {
>                 skb->transport_header -= IPV4_BEET_PHMAXLEN;
> -       } else if (proto == IPPROTO_TCP) {
> -               skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
>         }
>
>         __skb_pull(skb, skb_transport_offset(skb));
> --
> 2.1.0
>