3 files changed, 10 insertions, 24 deletions

diff --git a/net/can/af_can.c b/net/can/af_can.c
index d249874a366d..a27f8aad9e99 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -57,6 +57,7 @@
 #include <linux/skbuff.h>
 #include <linux/can.h>
 #include <linux/can/core.h>
+#include <linux/can/skb.h>
 #include <linux/ratelimit.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>
@@ -290,7 +291,7 @@ int can_send(struct sk_buff *skb, int loop)
                                 return -ENOMEM;
                         }
 
-                        newskb->sk = skb->sk;
+                        can_skb_set_owner(newskb, skb->sk);
                         newskb->ip_summed = CHECKSUM_UNNECESSARY;
                         newskb->pkt_type = PACKET_BROADCAST;
                 }
diff --git a/net/can/bcm.c b/net/can/bcm.c
index 3fc737b214c7..dcb75c0e66c1 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -268,7 +268,7 @@ static void bcm_can_tx(struct bcm_op *op)
 
         /* send with loopback */
         skb->dev = dev;
-        skb->sk = op->sk;
+        can_skb_set_owner(skb, op->sk);
         can_send(skb, 1);
 
         /* update statistics */
@@ -1223,7 +1223,7 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk)
 
         can_skb_prv(skb)->ifindex = dev->ifindex;
         skb->dev = dev;
-        skb->sk  = sk;
+        can_skb_set_owner(skb, sk);
         err = can_send(skb, 1); /* send with loopback */
         dev_put(dev);
 
diff --git a/net/can/raw.c b/net/can/raw.c
index 07d72d852324..081e81fd017f 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -121,13 +121,9 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
         if (!ro->recv_own_msgs && oskb->sk == sk)
                 return;
 
-        /* do not pass frames with DLC > 8 to a legacy socket */
-        if (!ro->fd_frames) {
-                struct canfd_frame *cfd = (struct canfd_frame *)oskb->data;
-
-                if (unlikely(cfd->len > CAN_MAX_DLEN))
-                        return;
-        }
+        /* do not pass non-CAN2.0 frames to a legacy socket */
+        if (!ro->fd_frames && oskb->len != CAN_MTU)
+                return;
 
         /* clone the given skb to be able to enqueue it into the rcv queue */
         skb = skb_clone(oskb, GFP_ATOMIC);
@@ -715,6 +711,7 @@ static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
 
         skb->dev = dev;
         skb->sk  = sk;
+        skb->priority = sk->sk_priority;
 
         err = can_send(skb, ro->loopback);
 
@@ -737,9 +734,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
                        struct msghdr *msg, size_t size, int flags)
 {
         struct sock *sk = sock->sk;
-        struct raw_sock *ro = raw_sk(sk);
         struct sk_buff *skb;
-        int rxmtu;
         int err = 0;
         int noblock;
 
@@ -750,20 +745,10 @@ static int raw_recvmsg(struct kiocb *iocb, struct socket *sock,
         if (!skb)
                 return err;
 
-        /*
-         * when serving a legacy socket the DLC <= 8 is already checked inside
-         * raw_rcv(). Now check if we need to pass a canfd_frame to a legacy
-         * socket and cut the possible CANFD_MTU/CAN_MTU length to CAN_MTU
-         */
-        if (!ro->fd_frames)
-                rxmtu = CAN_MTU;
-        else
-                rxmtu = skb->len;
-
-        if (size < rxmtu)
+        if (size < skb->len)
                 msg->msg_flags |= MSG_TRUNC;
         else
-                size = rxmtu;
+                size = skb->len;
 
         err = memcpy_toiovec(msg->msg_iov, skb->data, size);
         if (err < 0) {