netdev - Re: [PATCH net-next v2] ila: ipv6/ila: fix nlsize calculation for lwtunnel

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Date:	Tue, 10 May 2016 08:51:48 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next v2] ila: ipv6/ila: fix nlsize calculation for lwtunnel

On Tue, May 10, 2016 at 2:56 AM, Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
> From: Tom Herbert <tom@...bertland.com>
>
> The handler 'ila_fill_encap_info' adds two attributes: ILA_ATTR_LOCATOR
> and ILA_ATTR_CSUM_MODE.
>
> nla_total_size_64bit() must be use for ILA_ATTR_LOCATOR.
>
> Also, do nla_put_u8 instead of nla_put_u64 for ILA_ATTR_CSUM_MODE.
>
> Fixes: f13a82d87b21 ("ipv6: use nla_put_u64_64bit()")
> Fixes: 90bfe662db13 ("ila: add checksum neutral ILA translations")
> Reported-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> Signed-off-by: Tom Herbert <tom@...bertland.com>
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> ---
>
> Tom, I have taken the liberty of resending your patch, I hope it's ok
> for you. Goal is to fix this before net-next closes.
>
> v1 -> v2:
>   update the patch after the merge of net (and thus update 'Fixes' tag)
>   use nla_total_size_64bit() for ILA_ATTR_LOCATOR
>
>  net/ipv6/ila/ila_lwt.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
> index 17038e1ede98..1dfb64166d7d 100644
> --- a/net/ipv6/ila/ila_lwt.c
> +++ b/net/ipv6/ila/ila_lwt.c
> @@ -133,7 +133,7 @@ static int ila_fill_encap_info(struct sk_buff *skb,
>         if (nla_put_u64_64bit(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator.v64,
>                               ILA_ATTR_PAD))
>                 goto nla_put_failure;
> -       if (nla_put_u64(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
> +       if (nla_put_u8(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode))
>                 goto nla_put_failure;
>
>         return 0;
> @@ -144,7 +144,9 @@ nla_put_failure:
>
>  static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
>  {
> -       return nla_total_size(sizeof(u64)); /* ILA_ATTR_LOCATOR */
> +       return nla_total_size_64bit(sizeof(u64)) + /* ILA_ATTR_LOCATOR */
> +              nla_total_size(sizeof(u8)) +        /* ILA_ATTR_CSUM_MODE */
> +              0;
>  }
>
>  static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
> --
> 2.8.1
>

Acked-by: Tom Herbert <tom@...bertland.com>