net: Split msg_iovlen check in recvmsg into each protocol

To prepare for supporting multiple iov in each protocol.

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>

net/bluetooth/bluetooth_recvmsg.c

@@ -330,6 +330,11 @@ ssize_t bluetooth_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
       return -EPROTONOSUPPORT;
     }
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   /* Perform the packet recvmsg() operation */
 
   /* Initialize the state structure.  This is done with the network

net/can/can_recvmsg.c

@@ -526,6 +526,11 @@ ssize_t can_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
       return -ENOSYS;
     }
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   net_lock();
 
   /* Initialize the state structure. */

net/icmp/icmp_recvmsg.c

@@ -296,6 +296,11 @@ ssize_t icmp_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
 
   /* Some sanity checks */
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   DEBUGASSERT(buf != NULL);
 
   if (len < ICMP_HDRLEN)

net/icmpv6/icmpv6_recvmsg.c

@@ -307,6 +307,11 @@ ssize_t icmpv6_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
 
   /* Some sanity checks */
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   DEBUGASSERT(buf != NULL);
 
   if (len < ICMPv6_HDRLEN)

net/ieee802154/ieee802154_recvmsg.c

@@ -330,6 +330,11 @@ ssize_t ieee802154_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
       return -EPROTONOSUPPORT;
     }
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   /* Perform the packet recvfrom() operation */
 
   /* Initialize the state structure.  This is done with the network

net/inet/inet_sockif.c

@@ -2273,6 +2273,11 @@ static ssize_t inet_recvmsg(FAR struct socket *psock,
 {
   ssize_t ret;
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   /* If a 'from' address has been provided, verify that it is large
    * enough to hold this address family.
    */

net/local/local_recvmsg.c

@@ -552,6 +552,11 @@ ssize_t local_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
       return 0;
     }
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   DEBUGASSERT(buf);
 
   /* Check for a stream socket */

net/netlink/netlink_sockif.c

@@ -680,6 +680,11 @@ static ssize_t netlink_recvmsg(FAR struct socket *psock,
   DEBUGASSERT(from == NULL ||
               (fromlen != NULL && *fromlen >= sizeof(struct sockaddr_nl)));
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   /* Find the response to this message.  The return value */
 
   entry = netlink_tryget_response(psock->s_conn);

net/pkt/pkt_recvmsg.c

@@ -410,6 +410,11 @@ ssize_t pkt_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
       return -EINVAL;
     }
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   if (psock->s_type != SOCK_RAW)
     {
       nerr("ERROR: Unsupported socket type: %d\n", psock->s_type);

net/rpmsg/rpmsg_sockif.c

@@ -1240,6 +1240,11 @@ static ssize_t rpmsg_socket_recvmsg(FAR struct socket *psock,
   size_t len = msg->msg_iov->iov_len;
   ssize_t ret;
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   if (psock->s_type != SOCK_STREAM &&
       _SS_ISBOUND(conn->sconn.s_flags) &&
       !_SS_ISCONNECTED(conn->sconn.s_flags))

net/socket/recvmsg.c

@@ -88,11 +88,6 @@ ssize_t psock_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
       return -EINVAL;
     }
 
-  if (msg->msg_iovlen != 1)
-    {
-      return -ENOTSUP;
-    }
-
   /* Verify that the sockfd corresponds to valid, allocated socket */
 
   if (psock == NULL || psock->s_conn == NULL)

net/usrsock/usrsock_recvmsg.c

@@ -222,6 +222,11 @@ ssize_t usrsock_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
   socklen_t outaddrlen = 0;
   ssize_t ret;
 
+  if (msg->msg_iovlen != 1)
+    {
+      return -ENOTSUP;
+    }
+
   if (fromlen)
     {
       if (*fromlen > 0 && from == NULL)