netdev - [PATCH ipsec 1/2] xfrm: fix xfrm child route lookup for packet offload

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Message-ID: <20240304122409.355875-2-yumike@google.com>
Date: Mon,  4 Mar 2024 12:24:08 +0000
From: Mike Yu <yumike@...gle.com>
To: netdev@...r.kernel.org, steffen.klassert@...unet.com, leonro@...dia.com
Cc: stanleyjhu@...gle.com, martinwu@...gle.com, chiachangwang@...gle.com, 
	yumike@...gle.com
Subject: [PATCH ipsec 1/2] xfrm: fix xfrm child route lookup for packet offload

In current code, xfrm_bundle_create() always uses the matched
SA's family type to look up a xfrm child route for the skb.
The route returned by xfrm_dst_lookup() will eventually be
used in xfrm_output_resume() (skb_dst(skb)->ops->local_out()).

If packet offload is used, the above behavior can lead to
calling ip_local_out() for an IPv6 packet or calling
ip6_local_out() for an IPv4 packet, which is likely to fail.

This change fixes the behavior by checking if the matched SA
has packet offload enabled. If not, keep the same behavior;
if yes, use the matched SP's family type for the lookup.

Test: verified IPv6-in-IPv4 packets on Android device with
      IPsec packet offload enabled
Signed-off-by: Mike Yu <yumike@...gle.com>
---
 net/xfrm/xfrm_policy.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 53b7ce4a4db0..bb7e7593a3f2 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2695,7 +2695,9 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
 			if (xfrm[i]->props.smark.v || xfrm[i]->props.smark.m)
 				mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]);

-			family = xfrm[i]->props.family;
+			if (xfrm[i]->xso.type != XFRM_DEV_OFFLOAD_PACKET)
+				family = xfrm[i]->props.family;
+
 			oif = fl->flowi_oif ? : fl->flowi_l3mdev;
 			dst = xfrm_dst_lookup(xfrm[i], tos, oif,
 					      &saddr, &daddr, family, mark);
-- 
2.44.0.rc1.240.g4c46232300-goog