netdev - Re: [PATCH net] sctp: translate host order to network order when setting a hmacid

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Date:	Thu, 12 Nov 2015 08:44:17 -0200
From:	marcelo.leitner@...il.com
To:	Xin Long <lucien.xin@...il.com>
Cc:	network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
	vyasevic@...hat.com, davem@...emloft.net
Subject: Re: [PATCH net] sctp: translate host order to network order when
 setting a hmacid

On Thu, Nov 12, 2015 at 01:07:07PM +0800, Xin Long wrote:
> now sctp auth cannot work well when setting a hmacid manually, which
> is caused by that we didn't use the network order for hmacid, so fix
> it by adding the transformation in sctp_auth_ep_set_hmacs.
> 
> even we set hmacid with the network order in userspace, it still
> can't work, because of this condition in sctp_auth_ep_set_hmacs():
> 
> 		if (id > SCTP_AUTH_HMAC_ID_MAX)
> 			return -EOPNOTSUPP;
> 
> so this wasn't working before and thus it won't break compatibility.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>

Fixes: 65b07e5d0d09 ("[SCTP]: API updates to suport SCTP-AUTH
extensions.")

Thanks!

> ---
>  net/sctp/auth.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sctp/auth.c b/net/sctp/auth.c
> index 4f15b7d..1543e39 100644
> --- a/net/sctp/auth.c
> +++ b/net/sctp/auth.c
> @@ -809,8 +809,8 @@ int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
>  	if (!has_sha1)
>  		return -EINVAL;
>  
> -	memcpy(ep->auth_hmacs_list->hmac_ids, &hmacs->shmac_idents[0],
> -		hmacs->shmac_num_idents * sizeof(__u16));
> +	for (i = 0; i < hmacs->shmac_num_idents; i++)
> +		ep->auth_hmacs_list->hmac_ids[i] = htons(hmacs->shmac_idents[i]);
>  	ep->auth_hmacs_list->param_hdr.length = htons(sizeof(sctp_paramhdr_t) +
>  				hmacs->shmac_num_idents * sizeof(__u16));
>  	return 0;
> -- 
> 2.1.0
> 
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