[v2,1/2] sctp: Export sctp_do_peeloff

lookup sctp_association within sctp_do_peeloff() to enable its use outside of
the sctp code with minimal knowledge of the former.

Signed-off-by: Benjamin Poirier <bpoirier@suse.de>

---
Changes from v1:
* make sctp_do_peeloff() take the assoc id as argument so that the dlm code
  doesn't need to do the id to struct lookup itself
* split those sctp changes to their own patch

 include/net/sctp/sctp.h |    1 +
 net/sctp/socket.c       |   24 +++++++++---------------
 2 files changed, 10 insertions(+), 15 deletions(-)

On 03/08/2012 10:55 AM, Benjamin Poirier wrote:
> lookup sctp_association within sctp_do_peeloff() to enable its use outside of
> the sctp code with minimal knowledge of the former.
> 
> Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
> 

Acked-by: Vlad Yasevich <vladislav.yasevich@hp.com>

-vlad

> ---
> Changes from v1:
> * make sctp_do_peeloff() take the assoc id as argument so that the dlm code
>   doesn't need to do the id to struct lookup itself
> * split those sctp changes to their own patch
> 
>  include/net/sctp/sctp.h |    1 +
>  net/sctp/socket.c       |   24 +++++++++---------------
>  2 files changed, 10 insertions(+), 15 deletions(-)
> 
> diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
> index d368561..6ee44b2 100644
> --- a/include/net/sctp/sctp.h
> +++ b/include/net/sctp/sctp.h
> @@ -413,6 +413,7 @@ static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
>  /* Look up the association by its id.  */
>  struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
>  
> +int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
>  
>  /* A macro to walk a list of skbs.  */
>  #define sctp_skb_for_each(pos, head, tmp) \
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 408ebd0..06b42b7 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -4170,14 +4170,16 @@ static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optv
>  }
>  
>  /* Helper routine to branch off an association to a new socket.  */
> -SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
> -				struct socket **sockp)
> +int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
>  {
> -	struct sock *sk = asoc->base.sk;
> +	struct sctp_association *asoc = sctp_id2assoc(sk, id);
>  	struct socket *sock;
>  	struct sctp_af *af;
>  	int err = 0;
>  
> +	if (!asoc)
> +		return -EINVAL;
> +
>  	/* An association cannot be branched off from an already peeled-off
>  	 * socket, nor is this supported for tcp style sockets.
>  	 */
> @@ -4206,13 +4208,13 @@ SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
>  
>  	return err;
>  }
> +EXPORT_SYMBOL(sctp_do_peeloff);
>  
>  static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
>  {
>  	sctp_peeloff_arg_t peeloff;
>  	struct socket *newsock;
>  	int retval = 0;
> -	struct sctp_association *asoc;
>  
>  	if (len < sizeof(sctp_peeloff_arg_t))
>  		return -EINVAL;
> @@ -4220,15 +4222,7 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
>  	if (copy_from_user(&peeloff, optval, len))
>  		return -EFAULT;
>  
> -	asoc = sctp_id2assoc(sk, peeloff.associd);
> -	if (!asoc) {
> -		retval = -EINVAL;
> -		goto out;
> -	}
> -
> -	SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc);
> -
> -	retval = sctp_do_peeloff(asoc, &newsock);
> +	retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
>  	if (retval < 0)
>  		goto out;
>  
> @@ -4239,8 +4233,8 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
>  		goto out;
>  	}
>  
> -	SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
> -			  __func__, sk, asoc, newsock->sk, retval);
> +	SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
> +			  __func__, sk, newsock->sk, retval);
>  
>  	/* Return the fd mapped to the new socket.  */
>  	peeloff.sd = retval;

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From: Vladislav Yasevich <vladislav.yasevich@hp.com>
Date: Thu, 08 Mar 2012 15:07:40 -0500

> On 03/08/2012 10:55 AM, Benjamin Poirier wrote:
>> lookup sctp_association within sctp_do_peeloff() to enable its use outside of
>> the sctp code with minimal knowledge of the former.
>> 
>> Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
>> 
> 
> Acked-by: Vlad Yasevich <vladislav.yasevich@hp.com>

Applied to net-next.
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