linux-kernel - [PATCH] net/macsec copy salt to MACSec ctx for XPN

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Date:   Mon,  2 May 2022 14:18:37 +0200
From:   Carlos Fernansez <carlos.escuin@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     carlos.fernandez@...hnica-enineering.de,
        Carlos Fernandez <carlos.fernandez@...hnica-engineering.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net/macsec copy salt to MACSec ctx for XPN

From: Carlos Fernandez <carlos.fernandez@...hnica-engineering.de>

Salt and KeyId copied to offloading context.

If not, offloaded phys cannot work with XPN

Signed-off-by: Carlos Fernandez <carlos.fernandez@...hnica-engineering.de>
---
 drivers/net/macsec.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 832f09ac075e..4f2bd3d722c3 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -1804,6 +1804,14 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
 
 	rx_sa->sc = rx_sc;
 
+	if (secy->xpn) {
+		rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
+		nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
+			   MACSEC_SALT_LEN);
+	}
+
+	nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
+
 	/* If h/w offloading is available, propagate to the device */
 	if (macsec_is_offloaded(netdev_priv(dev))) {
 		const struct macsec_ops *ops;
@@ -1826,13 +1834,6 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
 			goto cleanup;
 	}
 
-	if (secy->xpn) {
-		rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
-		nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
-			   MACSEC_SALT_LEN);
-	}
-
-	nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
 	rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
 
 	rtnl_unlock();
@@ -2046,6 +2047,14 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
 	if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
 		secy->operational = true;
 
+	if (secy->xpn) {
+		tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
+		nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
+			   MACSEC_SALT_LEN);
+	}
+
+	nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
+
 	/* If h/w offloading is available, propagate to the device */
 	if (macsec_is_offloaded(netdev_priv(dev))) {
 		const struct macsec_ops *ops;
@@ -2068,13 +2077,6 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
 			goto cleanup;
 	}
 
-	if (secy->xpn) {
-		tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
-		nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
-			   MACSEC_SALT_LEN);
-	}
-
-	nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
 	rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
 
 	rtnl_unlock();
-- 
2.25.1