seg6: bpf: fix skb checksum in bpf_push_seg6_encap()

BugLink: https://bugs.launchpad.net/bugs/1988351
[ Upstream commit 4889fbd98deaf243c3baadc54e296d71c6af1eb0 ]

Both helper functions bpf_lwt_seg6_action() and bpf_lwt_push_encap() use
the bpf_push_seg6_encap() to encapsulate the packet in an IPv6 with Segment
Routing Header (SRH) or insert an SRH between the IPv6 header and the
payload.
To achieve this result, such helper functions rely on bpf_push_seg6_encap()
which, in turn, leverages seg6_do_srh_{encap,inline}() to perform the
required operation (i.e. encap/inline).

This patch removes the initialization of the IPv6 header payload length
from bpf_push_seg6_encap(), as it is now handled properly by
seg6_do_srh_{encap,inline}() to prevent corruption of the skb checksum.

Fixes: fe94cc290f53 ("bpf: Add IPv6 Segment Routing helpers")
Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/net/core/filter.c b/net/core/filter.c
index d1e2ef77ce4c15b1a565d35bab11f27db2ecb837..8b2bc855714b5af105ec6cfb9b164fbdf96cfe4c 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5851,7 +5851,6 @@ static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len
        if (err)
                return err;
 
-       ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
        skb_set_transport_header(skb, sizeof(struct ipv6hdr));
 
        return seg6_lookup_nexthop(skb, NULL, 0);