1 files changed, 34 insertions, 18 deletions

diff --git a/net/can/raw.c b/net/can/raw.c
index 81071cdb0301..f64469b98260 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -132,8 +132,8 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
 		return;
 
 	/* make sure to not pass oversized frames to the socket */
-	if ((can_is_canfd_skb(oskb) && !ro->fd_frames && !ro->xl_frames) ||
-	    (can_is_canxl_skb(oskb) && !ro->xl_frames))
+	if ((!ro->fd_frames && can_is_canfd_skb(oskb)) ||
+	    (!ro->xl_frames && can_is_canxl_skb(oskb)))
 		return;
 
 	/* eliminate multiple filter matches for the same skb */
@@ -523,6 +523,7 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
 	struct can_filter sfilter;         /* single filter */
 	struct net_device *dev = NULL;
 	can_err_mask_t err_mask = 0;
+	int fd_frames;
 	int count = 0;
 	int err = 0;
 
@@ -664,12 +665,17 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
 		break;
 
 	case CAN_RAW_FD_FRAMES:
-		if (optlen != sizeof(ro->fd_frames))
+		if (optlen != sizeof(fd_frames))
 			return -EINVAL;
 
-		if (copy_from_sockptr(&ro->fd_frames, optval, optlen))
+		if (copy_from_sockptr(&fd_frames, optval, optlen))
 			return -EFAULT;
 
+		/* Enabling CAN XL includes CAN FD */
+		if (ro->xl_frames && !fd_frames)
+			return -EINVAL;
+
+		ro->fd_frames = fd_frames;
 		break;
 
 	case CAN_RAW_XL_FRAMES:
@@ -679,6 +685,9 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
 		if (copy_from_sockptr(&ro->xl_frames, optval, optlen))
 			return -EFAULT;
 
+		/* Enabling CAN XL includes CAN FD */
+		if (ro->xl_frames)
+			ro->fd_frames = ro->xl_frames;
 		break;
 
 	case CAN_RAW_JOIN_FILTERS:
@@ -786,6 +795,25 @@ static int raw_getsockopt(struct socket *sock, int level, int optname,
 	return 0;
 }
 
+static bool raw_bad_txframe(struct raw_sock *ro, struct sk_buff *skb, int mtu)
+{
+	/* Classical CAN -> no checks for flags and device capabilities */
+	if (can_is_can_skb(skb))
+		return false;
+
+	/* CAN FD -> needs to be enabled and a CAN FD or CAN XL device */
+	if (ro->fd_frames && can_is_canfd_skb(skb) &&
+	    (mtu == CANFD_MTU || can_is_canxl_dev_mtu(mtu)))
+		return false;
+
+	/* CAN XL -> needs to be enabled and a CAN XL device */
+	if (ro->xl_frames && can_is_canxl_skb(skb) &&
+	    can_is_canxl_dev_mtu(mtu))
+		return false;
+
+	return true;
+}
+
 static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 {
 	struct sock *sk = sock->sk;
@@ -833,20 +861,8 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 		goto free_skb;
 
 	err = -EINVAL;
-	if (ro->xl_frames && can_is_canxl_dev_mtu(dev->mtu)) {
-		/* CAN XL, CAN FD and Classical CAN */
-		if (!can_is_canxl_skb(skb) && !can_is_canfd_skb(skb) &&
-		    !can_is_can_skb(skb))
-			goto free_skb;
-	} else if (ro->fd_frames && dev->mtu == CANFD_MTU) {
-		/* CAN FD and Classical CAN */
-		if (!can_is_canfd_skb(skb) && !can_is_can_skb(skb))
-			goto free_skb;
-	} else {
-		/* Classical CAN */
-		if (!can_is_can_skb(skb))
-			goto free_skb;
-	}
+	if (raw_bad_txframe(ro, skb, dev->mtu))
+		goto free_skb;
 
 	sockcm_init(&sockc, sk);
 	if (msg->msg_controllen) {