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authorPeter Oskolkov <posk@google.com>2019-03-04 16:27:08 -0800
committerDaniel Borkmann <daniel@iogearbox.net>2019-03-07 10:41:29 +0100
commitea0371f7879987cff70e21d808e3e9fea624c051 (patch)
tree3e5382a16a4fe6485a32fd87b160364665e713cc /net/core/lwt_bpf.c
parent915905f8b1d452e70ee6d8637c3f0fb55a39691d (diff)
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: ca78801a81e0 ("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>
Diffstat (limited to 'net/core/lwt_bpf.c')
-rw-r--r--net/core/lwt_bpf.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c
index cf2f8897ca19..126d31ff5ee3 100644
--- a/net/core/lwt_bpf.c
+++ b/net/core/lwt_bpf.c
@@ -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 */
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_push(skb, len);
if (ingress)