netdev - [PATCH ipsec-next 4/6] xfrm: add TX datapath support for IPsec full offload mode

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Message-Id: <905b8e8032d5cdb48ef63cb153fd86552c8a6a7d.1652176932.git.leonro@nvidia.com>
Date:   Tue, 10 May 2022 13:36:55 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     Leon Romanovsky <leonro@...dia.com>,
        "David S . Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, Raed Salem <raeds@...dia.com>,
        ipsec-devel <devel@...ux-ipsec.org>
Subject: [PATCH ipsec-next 4/6] xfrm: add TX datapath support for IPsec full offload mode

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

In IPsec full mode, the device is going to encrypt and encapsulate
packets that are associated with offloaded policy. After successful
policy lookup to indicate if packets should be offloaded or not,
the stack forwards packets to the device to do the magic.

Signed-off-by: Raed Salem <raeds@...dia.com>
Signed-off-by: Huy Nguyen <huyn@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 net/xfrm/xfrm_output.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index d4935b3b9983..2599f3dbac08 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -718,6 +718,25 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb)
 		break;
 	}
 
+	if (x->xso.type == XFRM_DEV_OFFLOAD_FULL) {
+		struct dst_entry *dst = skb_dst_pop(skb);
+
+		if (!dst) {
+			XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR);
+			return -EHOSTUNREACH;
+		}
+
+		skb_dst_set(skb, dst);
+		err = skb_dst(skb)->ops->local_out(net, skb->sk, skb);
+		if (unlikely(err != 1))
+			return err;
+
+		if (!skb_dst(skb)->xfrm)
+			return dst_output(net, skb->sk, skb);
+
+		return 0;
+	}
+
 	secpath_reset(skb);
 
 	if (xfrm_dev_offload_ok(skb, x)) {
-- 
2.35.1