netdev - [PATCH] xfrm: Allow ESP over UDP in packet offload mode

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Date: Tue, 18 Jul 2023 12:24:05 +0300
From: Ilia Lin <quic_ilial@...cinc.com>
To: steffen.klassert@...unet.com,
	herbert@...dor.apana.org.au,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	leonro@...dia.com,
	Ilia Lin <ilia.lin@...nel.org>
Subject: [PATCH] xfrm: Allow ESP over UDP in packet offload mode

The ESP encapsulation is not supported only in crypto mode.
In packet offload mode, the RX is bypassing the XFRM,
so we can enable the encapsulation.

Signed-off-by: Ilia Lin <ilia.lin@...nel.org>
---
 net/xfrm/xfrm_device.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 4aff76c6f12e0..3018468d97662 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -246,8 +246,10 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
 		return -EINVAL;
 	}
 
-	/* We don't yet support UDP encapsulation and TFC padding. */
-	if (x->encap || x->tfcpad) {
+	is_packet_offload = xuo->flags & XFRM_OFFLOAD_PACKET;
+
+	/* We don't yet support UDP encapsulation except full mode and TFC padding. */
+	if ((!is_packet_offload && x->encap) || x->tfcpad) {
 		NL_SET_ERR_MSG(extack, "Encapsulation and TFC padding can't be offloaded");
 		return -EINVAL;
 	}
@@ -258,7 +260,6 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
 		return -EINVAL;
 	}
 
-	is_packet_offload = xuo->flags & XFRM_OFFLOAD_PACKET;
 	dev = dev_get_by_index(net, xuo->ifindex);
 	if (!dev) {
 		if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) {
--