netdev - [PATCH 11/12] xfrm: prevent configuration of interface index when offload is used

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Message-ID: <20250523075611.3723340-12-steffen.klassert@secunet.com>
Date: Fri, 23 May 2025 09:56:10 +0200
From: Steffen Klassert <steffen.klassert@...unet.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>
CC: Herbert Xu <herbert@...dor.apana.org.au>, Steffen Klassert
	<steffen.klassert@...unet.com>, <netdev@...r.kernel.org>
Subject: [PATCH 11/12] xfrm: prevent configuration of interface index when offload is used

From: Leon Romanovsky <leonro@...dia.com>

Both packet and crypto offloads perform decryption while packet is
arriving to the HW from the wire. It means that there is no possible
way to perform lookup on XFRM if_id as it can't be set to be "before' HW.

So instead of silently ignore this configuration, let's warn users about
misconfiguration.

Signed-off-by: Leon Romanovsky <leonro@...dia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/xfrm/xfrm_device.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 3be0139373f7..81fd486b5e56 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -251,6 +251,11 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
 		return -EINVAL;
 	}
 
+	if (xuo->flags & XFRM_OFFLOAD_INBOUND && x->if_id) {
+		NL_SET_ERR_MSG(extack, "XFRM if_id is not supported in RX path");
+		return -EINVAL;
+	}
+
 	is_packet_offload = xuo->flags & XFRM_OFFLOAD_PACKET;
 
 	/* We don't yet support TFC padding. */
-- 
2.34.1