netdev - Re: [PATCH net-next v2] net: sctp: sctp_verify_init: clean up mandatory checks and add comment

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Date:	Tue, 27 Aug 2013 18:23:30 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Daniel Borkmann <dborkman@...hat.com>
CC:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-sctp@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: sctp: sctp_verify_init: clean up mandatory
 checks and add comment

Hello.

On 27-08-2013 18:06, Daniel Borkmann wrote:

> Add a comment related to RFC4960 explaning why we do not check for initial
> TSN, and while at it, remove yoda notation checks and clean up code from
> checks of mandatory conditions. That's probably just really minor, but makes
> reviewing easier.

> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
> ---
>   v1->v2: update comment as Neil suggested

>   net/sctp/sm_make_chunk.c | 26 ++++++++++++--------------
>   1 file changed, 12 insertions(+), 14 deletions(-)

> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index 01e9783..e1c1531 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -2240,25 +2240,23 @@ int sctp_verify_init(struct net *net, const struct sctp_association *asoc,
>   		     struct sctp_chunk **errp)
>   {
>   	union sctp_params param;
> -	int has_cookie = 0;
> +	bool has_cookie = false;
>   	int result;
>
> -	/* Verify stream values are non-zero. */
> -	if ((0 == peer_init->init_hdr.num_outbound_streams) ||
> -	    (0 == peer_init->init_hdr.num_inbound_streams) ||
> -	    (0 == peer_init->init_hdr.init_tag) ||
> -	    (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
> -
> +	/* Check for missing mandatory parameters. Note: Initial TSN is
> +	 * also mandatory, but is not checked here since the valid range
> +	 * is 0..2**(32-1). RFC4960, section 3.3.3.

    I don't think you really meant 2**(32-1) == 2**31. Previously you wrote 
2**32-1.

WBR, Sergei

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