[PATCH 08/15] esp4: support ipv6 nexthdrs process for beet gso segment

[Steffen Klassert]

From: Xin Long <lucien....@gmail.com>

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'.

v1->v2:
  - remove skb_transport_offset(), as it will always return 0
    in xfrm6_beet_gso_segment(), thank Sabrina's check.

Fixes: 384a46ea7bdc ("esp4: add gso_segment for esp4 beet mode")
Signed-off-by: Xin Long <lucien....@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
 net/ipv4/esp4_offload.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index 231edcb84c08..9b1d451edae0 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -137,7 +137,7 @@ 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;
 
@@ -146,10 +146,15 @@ 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) {
+               __be16 frag;
+
+               skb->transport_header +=
+                       ipv6_skip_exthdr(skb, 0, &proto, &frag);
+               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));
-- 
2.17.1