linux-kernel - [PATCH 1/1] can: skb: add and set local

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Date:   Wed, 11 May 2022 14:19:13 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Devid Antonio Filoni <devid.filoni@...uetechnologies.com>,
        kernel@...gutronix.de, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Jander <david@...tonic.nl>
Subject: [PATCH 1/1] can: skb: add and set local_origin flag

Add new can_skb_priv::local_origin flag to be able detect egress
packages even if they was sent directly from kernel and not assigned to
some socket.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Devid Antonio Filoni <devid.filoni@...uetechnologies.com>
---
 drivers/net/can/dev/skb.c | 3 +++
 include/linux/can/skb.h   | 1 +
 net/can/raw.c             | 2 +-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/dev/skb.c b/drivers/net/can/dev/skb.c
index 61660248c69e..3e2357fb387e 100644
--- a/drivers/net/can/dev/skb.c
+++ b/drivers/net/can/dev/skb.c
@@ -63,6 +63,7 @@ int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
 
 		/* save frame_len to reuse it when transmission is completed */
 		can_skb_prv(skb)->frame_len = frame_len;
+		can_skb_prv(skb)->local_origin = true;
 
 		skb_tx_timestamp(skb);
 
@@ -200,6 +201,7 @@ struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf)
 	can_skb_reserve(skb);
 	can_skb_prv(skb)->ifindex = dev->ifindex;
 	can_skb_prv(skb)->skbcnt = 0;
+	can_skb_prv(skb)->local_origin = false;
 
 	*cf = skb_put_zero(skb, sizeof(struct can_frame));
 
@@ -231,6 +233,7 @@ struct sk_buff *alloc_canfd_skb(struct net_device *dev,
 	can_skb_reserve(skb);
 	can_skb_prv(skb)->ifindex = dev->ifindex;
 	can_skb_prv(skb)->skbcnt = 0;
+	can_skb_prv(skb)->local_origin = false;
 
 	*cfd = skb_put_zero(skb, sizeof(struct canfd_frame));
 
diff --git a/include/linux/can/skb.h b/include/linux/can/skb.h
index fdb22b00674a..1b8a8cf2b13b 100644
--- a/include/linux/can/skb.h
+++ b/include/linux/can/skb.h
@@ -52,6 +52,7 @@ struct can_skb_priv {
 	int ifindex;
 	int skbcnt;
 	unsigned int frame_len;
+	bool local_origin;
 	struct can_frame cf[];
 };
 
diff --git a/net/can/raw.c b/net/can/raw.c
index b7dbb57557f3..df2d9334b395 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -173,7 +173,7 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
 	/* add CAN specific message flags for raw_recvmsg() */
 	pflags = raw_flags(skb);
 	*pflags = 0;
-	if (oskb->sk)
+	if (can_skb_prv(skb)->local_origin)
 		*pflags |= MSG_DONTROUTE;
 	if (oskb->sk == sk)
 		*pflags |= MSG_CONFIRM;
-- 
2.30.2