tcp: ioctl type SIOCOUTQNSD returns amount of data not sent

In contrast to SIOCOUTQ which returns the amount of data sent
but not yet acknowledged plus data not yet sent this patch only
returns the data not sent.

For various methods of live streaming bitrate control it may
be helpful to know how much data are in the tcp outqueue are
not sent yet.

Signed-off-by: Mario Schuknecht <[e-mail]>
Signed-off-by: Steffen Sledz <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/sockios.h

···
 
 /* Linux-specific socket ioctls */
 #define SIOCINQ		FIONREAD
-#define SIOCOUTQ	TIOCOUTQ
+#define SIOCOUTQ	TIOCOUTQ        /* output queue size (not sent + not acked) */
 
 /* Routing table calls. */
 #define SIOCADDRT	0x890B		/* add routing table entry	*/
···
 #define SIOCSMIIREG	0x8949		/* Write MII PHY register.	*/
 
 #define SIOCWANDEV	0x894A		/* get/set netdev parameters	*/
+
+#define SIOCOUTQNSD	0x894B		/* output queue size (not sent only) */
 
 /* ARP cache control calls. */
 		    /*  0x8950 - 0x8952  * obsolete calls, don't re-use */

net/ipv4/tcp.c

···
 		else
 			answ = tp->write_seq - tp->snd_una;
 		break;
+	case SIOCOUTQNSD:
+		if (sk->sk_state == TCP_LISTEN)
+			return -EINVAL;
+
+		if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))
+			answ = 0;
+		else
+			answ = tp->write_seq - tp->snd_nxt;
+		break;
 	default:
 		return -ENOIOCTLCMD;
 	}