linux-kernel - [PATCH] sctp: implement SIOCINQ ioctl()

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Date:	Wed, 23 Jun 2010 23:37:40 +0200
From:	Diego Elio 'Flameeyes' Pettenò 
	<flameeyes@...il.com>
To:	linux-kernel@...r.kernel.org, linux-sctp@...r.kernel.org
Subject: [PATCH] sctp: implement SIOCINQ ioctl()

This simple patch copies the current approach for SIOCINQ ioctl() from DCCP
into SCTp so that the userland code working with SCTP can use a similar
interface across different protocols to know how much space to allocate for
a buffer.
---
 net/sctp/socket.c |   31 ++++++++++++++++++++++++++++++-
 1 files changed, 30 insertions(+), 1 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 44a1ab0..3135b4e 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3595,7 +3595,36 @@ out:
 /* The SCTP ioctl handler. */
 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
 {
-	return -ENOIOCTLCMD;
+	int rc = -ENOTCONN;
+
+	sctp_lock_sock(sk);
+
+	if (sctp_sstate(sk, LISTENING))
+		goto out;
+
+	switch(cmd) {
+	case SIOCINQ: {
+		struct sk_buff *skb;
+		unsigned long amount = 0;
+
+		skb = skb_peek(&sk->sk_receive_queue);
+		if (skb != NULL) {
+			/*
+			 * We will only return the amount of this packet since
+			 * that is all that will be read.
+			 */
+			amount = skb->len;
+		}
+		rc = put_user(amount, (int __user *)arg);
+	}
+		break;
+	default:
+		rc = -ENOIOCTLCMD;
+		break;
+	}
+out:
+	sctp_release_sock(sk);
+	return rc;
 }
 
 /* This is the function which gets called during socket creation to
-- 
1.7.1

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