netdev - Re: [PATCHv2 bluetooth-next 05/10] ndisc: add addr_len parameter to ndisc_opt_addr

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Date:	Tue, 3 May 2016 20:17:14 +0200
From:	Stefan Schmidt <stefan@....samsung.com>
To:	Alexander Aring <aar@...gutronix.de>, linux-wpan@...r.kernel.org
Cc:	kernel@...gutronix.de, marcel@...tmann.org,
	jukka.rissanen@...ux.intel.com, hannes@...essinduktion.org,
	mcr@...delman.ca, werner@...esberger.net,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
	"David S . Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCHv2 bluetooth-next 05/10] ndisc: add addr_len parameter to
 ndisc_opt_addr_data

Hello.

On 20/04/16 10:19, Alexander Aring wrote:
> This patch makes the address length as argument for the
> ndisc_opt_addr_data function. This is necessary to handle addresses
> which don't use dev->addr_len as address length.
>
> Cc: David S. Miller<davem@...emloft.net>
> Cc: Alexey Kuznetsov<kuznet@....inr.ac.ru>
> Cc: James Morris<jmorris@...ei.org>
> Cc: Hideaki YOSHIFUJI<yoshfuji@...ux-ipv6.org>
> Cc: Patrick McHardy<kaber@...sh.net>
> Signed-off-by: Alexander Aring<aar@...gutronix.de>
> ---
>   include/net/ndisc.h |  5 +++--
>   net/ipv6/ndisc.c    | 11 +++++++----
>   net/ipv6/route.c    |  2 +-
>   3 files changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/include/net/ndisc.h b/include/net/ndisc.h
> index ef43e88..aac868e 100644
> --- a/include/net/ndisc.h
> +++ b/include/net/ndisc.h
> @@ -134,12 +134,13 @@ static inline int ndisc_opt_addr_space(struct net_device *dev,
>   }
>   
>   static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
> -				      struct net_device *dev)
> +				      struct net_device *dev,
> +				      unsigned char addr_len)
>   {
>   	u8 *lladdr = (u8 *)(p + 1);
>   	int lladdrlen = p->nd_opt_len << 3;
>   	int prepad = ndisc_addr_option_pad(dev->type);
> -	if (lladdrlen != ndisc_opt_addr_space(dev, dev->addr_len))
> +	if (lladdrlen != ndisc_opt_addr_space(dev, addr_len))
>   		return NULL;
>   	return lladdr + prepad;
>   }
> diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
> index 69e20e3..4e91d5e 100644
> --- a/net/ipv6/ndisc.c
> +++ b/net/ipv6/ndisc.c
> @@ -744,7 +744,8 @@ static void ndisc_recv_ns(struct sk_buff *skb)
>   	}
>   
>   	if (ndopts.nd_opts_src_lladdr) {
> -		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
> +		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev,
> +					     dev->addr_len);
>   		if (!lladdr) {
>   			ND_PRINTK(2, warn,
>   				  "NS: invalid link-layer address length\n");
> @@ -916,7 +917,8 @@ static void ndisc_recv_na(struct sk_buff *skb)
>   		return;
>   	}
>   	if (ndopts.nd_opts_tgt_lladdr) {
> -		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
> +		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev,
> +					     dev->addr_len);
>   		if (!lladdr) {
>   			ND_PRINTK(2, warn,
>   				  "NA: invalid link-layer address length\n");
> @@ -1024,7 +1026,7 @@ static void ndisc_recv_rs(struct sk_buff *skb)
>   
>   	if (ndopts.nd_opts_src_lladdr) {
>   		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
> -					     skb->dev);
> +					     skb->dev, skb->dev->addr_len);
>   		if (!lladdr)
>   			goto out;
>   	}
> @@ -1322,7 +1324,8 @@ skip_linkparms:
>   		u8 *lladdr = NULL;
>   		if (ndopts.nd_opts_src_lladdr) {
>   			lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
> -						     skb->dev);
> +						     skb->dev,
> +						     skb->dev->addr_len);
>   			if (!lladdr) {
>   				ND_PRINTK(2, warn,
>   					  "RA: invalid link-layer address length\n");
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index ed44663..cc180b3 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -2157,7 +2157,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
>   	lladdr = NULL;
>   	if (ndopts.nd_opts_tgt_lladdr) {
>   		lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
> -					     skb->dev);
> +					     skb->dev, skb->dev->addr_len);
>   		if (!lladdr) {
>   			net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
>   			return;

Reviewed-by: Stefan Schmidt<stefan@....samsung.com>

regards
Stefan Schmidt