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net: fix GSO in bpf_lwt_push_ip_encap 

GSO needs inner headers and inner protocol set properly to work.

skb->inner_mac_header: skb_reset_inner_headers() assigns the current
mac header value to inner_mac_header; but it is not set at the point,
so we need to call skb_reset_inner_mac_header, otherwise gre_gso_segment
fails: it does

    int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
    ...
    if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
    ...

skb->inner_protocol should also be correctly set.

Fixes: ca78801a81 ("bpf: handle GSO in bpf_lwt_push_encap")
Signed-off-by: Peter Oskolkov <posk@google.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Peter Oskolkov 2019-03-04 16:27:08 -08:00 committed by Daniel Borkmann
parent 915905f8b1
commit ea0371f787
1 changed files with 2 additions and 0 deletions
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2
net/core/lwt_bpf.c
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@ -625,6 +625,8 @@ int bpf_lwt_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, bool ingress)
/* push the encap headers and fix pointers */ /* push the encap headers and fix pointers */
skb_reset_inner_headers(skb); skb_reset_inner_headers(skb);
skb_reset_inner_mac_header(skb); /* mac header is not yet set */
skb_set_inner_protocol(skb, skb->protocol);
skb->encapsulation = 1; skb->encapsulation = 1;
skb_push(skb, len); skb_push(skb, len);
if (ingress) if (ingress)