netdev - [PATCH ipsec-next v4 2/2] xfrm: Refactor migration setup during the cloning process

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Message-ID: <20250310091620.2706700-3-chiachangwang@google.com>
Date: Mon, 10 Mar 2025 09:16:20 +0000
From: Chiachang Wang <chiachangwang@...gle.com>
To: netdev@...r.kernel.org, steffen.klassert@...unet.com, leonro@...dia.com
Cc: chiachangwang@...gle.com, stanleyjhu@...gle.com, yumike@...gle.com
Subject: [PATCH ipsec-next v4 2/2] xfrm: Refactor migration setup during the
 cloning process

Previously, migration related setup, such as updating family,
destination address, and source address, was performed after
the clone was created in `xfrm_state_migrate`. This change
moves this setup into the cloning function itself, improving
code locality and reducing redundancy.

The `xfrm_state_clone_and_setup` function now conditionally
applies the migration parameters from struct xfrm_migrate
if it is provided. This allows the function to be used both
for simple cloning and for cloning with migration setup.

Test: Tested with kernel test in the Android tree located
      in https://android.googlesource.com/kernel/tests/
      The xfrm_tunnel_test.py under the tests folder in
      particular.
Signed-off-by: Chiachang Wang <chiachangwang@...gle.com>
---
 net/xfrm/xfrm_state.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 9cd707362767..0365daedea32 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1958,8 +1958,9 @@ static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *secu
 	return 0;
 }

-static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
-					   struct xfrm_encap_tmpl *encap)
+static struct xfrm_state *xfrm_state_clone_and_setup(struct xfrm_state *orig,
+					   struct xfrm_encap_tmpl *encap,
+					   struct xfrm_migrate *m)
 {
 	struct net *net = xs_net(orig);
 	struct xfrm_state *x = xfrm_state_alloc(net);
@@ -2058,6 +2059,12 @@ static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
 			goto error;
 	}

+	if (m) {
+		x->props.family = m->new_family;
+		memcpy(&x->id.daddr, &m->new_daddr, sizeof(x->id.daddr));
+		memcpy(&x->props.saddr, &m->new_saddr, sizeof(x->props.saddr));
+	}
+
 	return x;

  error:
@@ -2127,18 +2134,13 @@ struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
 {
 	struct xfrm_state *xc;

-	xc = xfrm_state_clone(x, encap);
+	xc = xfrm_state_clone_and_setup(x, encap, m);
 	if (!xc)
 		return NULL;

-	xc->props.family = m->new_family;
-
 	if (xfrm_init_state(xc) < 0)
 		goto error;

-	memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
-	memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
-
 	/* configure the hardware if offload is requested */
 	if (xuo && xfrm_dev_state_add(net, xc, xuo, extack))
 		goto error;
--
2.49.0.rc0.332.g42c0ae87b1-goog