netdev - [PATCH ipsec-next v5 3/8] xfrm: allow migration from UDP encapsulated to non-encapsulated ESP

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Message-ID: <7c30e7f8543048a384f693684ccba5f71fe8543b.1769509131.git.antony.antony@secunet.com>
Date: Tue, 27 Jan 2026 11:42:40 +0100
From: Antony Antony <antony.antony@...unet.com>
To: Antony Antony <antony.antony@...unet.com>, Steffen Klassert
	<steffen.klassert@...unet.com>, Herbert Xu <herbert@...dor.apana.org.au>,
	<netdev@...r.kernel.org>
CC: "David S . Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Chiachang Wang <chiachangwang@...gle.com>, Yan Yan
	<evitayan@...gle.com>, <devel@...ux-ipsec.org>, Simon Horman
	<horms@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH ipsec-next v5 3/8] xfrm: allow migration from UDP encapsulated to non-encapsulated ESP

The current code prevents migrating an SA from UDP encapsulation to
plain ESP. This is needed when moving from a NATed path to a non-NATed
one, for example when switching from IPv4+NAT to IPv6.

Only copy the existing encapsulation during migration if the encap
attribute is explicitly provided.

Note: PF_KEY's SADB_X_MIGRATE always passes encap=NULL and never
supported encapsulation in migration. PF_KEY is deprecated and was
in feature freeze when UDP encapsulation was added to xfrm.

Signed-off-by: Antony Antony <antony.antony@...unet.com>
---
 net/xfrm/xfrm_state.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 3ee92f93dbd2..9ddd033f5d79 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2008,14 +2008,8 @@ static struct xfrm_state *xfrm_state_clone_and_setup(struct xfrm_state *orig,
 	}
 	x->props.calgo = orig->props.calgo;
 
-	if (encap || orig->encap) {
-		if (encap)
-			x->encap = kmemdup(encap, sizeof(*x->encap),
-					GFP_KERNEL);
-		else
-			x->encap = kmemdup(orig->encap, sizeof(*x->encap),
-					GFP_KERNEL);
-
+	if (encap) {
+		x->encap = kmemdup(encap, sizeof(*x->encap), GFP_KERNEL);
 		if (!x->encap)
 			goto error;
 	}
-- 
2.39.5