netdev - [PATCH ipsec 2/2] xfrm: set skb control buffer based on packet offload as well

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Message-ID: <20240304122409.355875-3-yumike@google.com>
Date: Mon,  4 Mar 2024 12:24:09 +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 2/2] xfrm: set skb control buffer based on packet
 offload as well

In packet offload, packets are not encrypted in XFRM stack, so
the next network layer which the packets will be forwarded to
should depend on where the packet came from (either xfrm4_output
or xfrm6_output) rather than the matched SA's family type.

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_output.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 662c83beb345..e5722c95b8bb 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -704,9 +704,13 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb)
 {
 	struct net *net = dev_net(skb_dst(skb)->dev);
 	struct xfrm_state *x = skb_dst(skb)->xfrm;
+	int family;
 	int err;
 
-	switch (x->outer_mode.family) {
+	family = (x->xso.type != XFRM_DEV_OFFLOAD_PACKET) ? x->outer_mode.family
+		: skb_dst(skb)->ops->family;
+
+	switch (family) {
 	case AF_INET:
 		memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 		IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
-- 
2.44.0.rc1.240.g4c46232300-goog