can-raw: add msg_flags to distinguish local traffic

CAN has no addressing scheme. It is currently impossible for userspace
to tell is a received CAN frame comes from another process on the local
host, or from a remote CAN device.

This patch add support for userspace applications to distinguish between
'own', 'local' and 'remote' CAN traffic. The distinction is made by returning
flags in msg->msg_flags in the call to recvmsg().

The added documentation explains the introduced flags.

Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 30 insertions, 3 deletions

diff --git a/net/can/raw.c b/net/can/raw.c
index 7d77e67..e88f610 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -90,23 +90,39 @@ struct raw_sock {
 	can_err_mask_t err_mask;
 };
 
+/*
+ * Return pointer to store the extra msg flags for raw_recvmsg().
+ * We use the space of one unsigned int beyond the 'struct sockaddr_can'
+ * in skb->cb.
+ */
+static inline unsigned int *raw_flags(struct sk_buff *skb)
+{
+	BUILD_BUG_ON(sizeof(skb->cb) <= (sizeof(struct sockaddr_can) +
+					 sizeof(unsigned int)));
+
+	/* return pointer after struct sockaddr_can */
+	return (unsigned int *)(&((struct sockaddr_can *)skb->cb)[1]);
+}
+
 static inline struct raw_sock *raw_sk(const struct sock *sk)
 {
 	return (struct raw_sock *)sk;
 }
 
-static void raw_rcv(struct sk_buff *skb, void *data)
+static void raw_rcv(struct sk_buff *oskb, void *data)
 {
 	struct sock *sk = (struct sock *)data;
 	struct raw_sock *ro = raw_sk(sk);
 	struct sockaddr_can *addr;
+	struct sk_buff *skb;
+	unsigned int *pflags;
 
 	/* check the received tx sock reference */
-	if (!ro->recv_own_msgs && skb->sk == sk)
+	if (!ro->recv_own_msgs && oskb->sk == sk)
 		return;
 
 	/* clone the given skb to be able to enqueue it into the rcv queue */
-	skb = skb_clone(skb, GFP_ATOMIC);
+	skb = skb_clone(oskb, GFP_ATOMIC);
 	if (!skb)
 		return;
 
@@ -123,6 +139,14 @@ static void raw_rcv(struct sk_buff *skb, void *data)
 	addr->can_family  = AF_CAN;
 	addr->can_ifindex = skb->dev->ifindex;
 
+	/* add CAN specific message flags for raw_recvmsg() */
+	pflags = raw_flags(skb);
+	*pflags = 0;
+	if (oskb->sk)
+		*pflags |= MSG_DONTROUTE;
+	if (oskb->sk == sk)
+		*pflags |= MSG_CONFIRM;
+
 	if (sock_queue_rcv_skb(sk, skb) < 0)
 		kfree_skb(skb);
 }
@@ -707,6 +731,9 @@ static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
 		memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
 	}
 
+	/* assign the flags that have been recorded in raw_rcv() */
+	msg->msg_flags |= *(raw_flags(skb));
+
 	skb_free_datagram(sk, skb);
 
 	return size;