sctp: implement SIOCINQ ioctl() (take 3)
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. Signed-off-by: Diego Elio Pettenò <flameeyes@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -3592,7 +3592,40 @@ out:
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/* The SCTP ioctl handler. */
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SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
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{
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return -ENOIOCTLCMD;
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int rc = -ENOTCONN;
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sctp_lock_sock(sk);
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/*
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* SEQPACKET-style sockets in LISTENING state are valid, for
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* SCTP, so only discard TCP-style sockets in LISTENING state.
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*/
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if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
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goto out;
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switch (cmd) {
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case SIOCINQ: {
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struct sk_buff *skb;
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unsigned int amount = 0;
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skb = skb_peek(&sk->sk_receive_queue);
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if (skb != NULL) {
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/*
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* We will only return the amount of this packet since
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* that is all that will be read.
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*/
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amount = skb->len;
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}
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rc = put_user(amount, (int __user *)arg);
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}
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break;
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default:
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rc = -ENOIOCTLCMD;
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break;
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}
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out:
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sctp_release_sock(sk);
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return rc;
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}
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/* This is the function which gets called during socket creation to
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