net: support 64bit values for setsockopt(SO_MAX_PACING_RATE)

64bit kernels now support 64bit pacing rates.

This commit changes setsockopt() to accept 64bit
values provided by applications.

Old applications providing 32bit value are still supported,
but limited to the old 34Gbit limitation.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/sock.c

@@ -1108,15 +1108,23 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 #endif
 
 	case SO_MAX_PACING_RATE:
-		if (val != ~0U)
+		{
+		unsigned long ulval = (val == ~0U) ? ~0UL : val;
+
+		if (sizeof(ulval) != sizeof(val) &&
+		    optlen >= sizeof(ulval) &&
+		    get_user(ulval, (unsigned long __user *)optval)) {
+			ret = -EFAULT;
+			break;
+		}
+		if (ulval != ~0UL)
 			cmpxchg(&sk->sk_pacing_status,
 				SK_PACING_NONE,
 				SK_PACING_NEEDED);
-		sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val;
-		sk->sk_pacing_rate = min(sk->sk_pacing_rate,
-					 sk->sk_max_pacing_rate);
+		sk->sk_max_pacing_rate = ulval;
+		sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
 		break;
-
+		}
 	case SO_INCOMING_CPU:
 		sk->sk_incoming_cpu = val;
 		break;