From: Andrea Mayer <andrea.mayer@uniroma2.it>
Date: Tue, 12 Jul 2022 17:58:36 +0000 (+0200)
Subject: seg6: fix skb checksum in SRv6 End.B6 and End.B6.Encaps behaviors
X-Git-Tag: v5.10.132~44
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=7b38df59a8f4119e1c9d83922f28c67fac9291d8;p=users%2Fdwmw2%2Flinux.git

seg6: fix skb checksum in SRv6 End.B6 and End.B6.Encaps behaviors

[ Upstream commit f048880fc77058d864aff5c674af7918b30f312a ]

The SRv6 End.B6 and End.B6.Encaps behaviors rely on functions
seg6_do_srh_{encap,inline}() to, respectively: i) encapsulate the
packet within an outer IPv6 header with the specified Segment Routing
Header (SRH); ii) insert the specified SRH directly after the IPv6
header of the packet.

This patch removes the initialization of the IPv6 header payload length
from the input_action_end_b6{_encap}() functions, as it is now handled
properly by seg6_do_srh_{encap,inline}() to avoid corruption of the skb
checksum.

Fixes: 140f04c33bbc ("ipv6: sr: implement several seg6local actions")
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>
---

diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index eba23279912df..11f7da4139f66 100644
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -435,7 +435,6 @@ static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
 	if (err)
 		goto drop;
 
-	ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
 	skb_set_transport_header(skb, sizeof(struct ipv6hdr));
 
 	seg6_lookup_nexthop(skb, NULL, 0);
@@ -467,7 +466,6 @@ static int input_action_end_b6_encap(struct sk_buff *skb,
 	if (err)
 		goto drop;
 
-	ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
 	skb_set_transport_header(skb, sizeof(struct ipv6hdr));
 
 	seg6_lookup_nexthop(skb, NULL, 0);