netdev - RE: [PATCH net-next 1/6] Support for SCTP

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Date:	Tue, 17 Jun 2014 12:35:16 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Geir Ola Vaagland' <geirola@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
	Vlad Yasevich <vyasevich@...il.com>
Subject: RE: [PATCH net-next 1/6] Support for SCTP_RECVRCVINFO socket option

From: Geir Ola Vaagland
> diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
> index 0a248b3..75c598a 100644
> --- a/include/net/sctp/structs.h
> +++ b/include/net/sctp/structs.h
> @@ -216,6 +216,7 @@ struct sctp_sock {
>  	__u8 frag_interleave;
>  	__u32 adaptation_ind;
>  	__u32 pd_point;
> +	__u8 recvrcvinfo;

This adds a lot of padding.
Possibly it should also be a 'bool'

...
> +static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
> +		char __user *optval,
> +		unsigned int optlen){
> +
> +	int val;
> +
> +	if(optlen < sizeof(int))
> +		return -EINVAL;
> +
> +	if(get_user(val, (int __user*)optval)){
> +		return -EFAULT;
> +	}

I suspect the above code is quite common, and should be put into
a separate function.

> +	sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;

See 'bool'

...
> +static int sctp_getsockopt_recvrcvinfo(struct sock *sk,
> +		int len,
> +		char __user *optval,
> +		int __user *optlen){
> +
> +	int val;
> +
> +	if (len < sizeof(int))
> +		return -EINVAL;
> +
> +	len = sizeof(int);
> +	val = (sctp_sk(sk)->recvrcvinfo == 1);
> +	if (put_user(len, optlen))
> +		return -EFAULT;
> +	if (copy_to_user(optval, &val, len))
> +		return -EFAULT;

This wants factoring out as well.

...
	David



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