netdev - Re: [net-next-2.6 PATCH 1/7] xfrm: introduce basic mark infrastructure

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Date:	Mon, 15 Feb 2010 16:42:40 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	jamal <hadi@...erus.ca>
CC:	timo.teras@....fi, herbert@...dor.apana.org.au,
	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [net-next-2.6 PATCH 1/7] xfrm: introduce basic mark infrastructure

jamal wrote:
> +static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_kmark *m)
> +{
> +	if (attrs[XFRMA_MARK])
> +		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(m));
> +	else
> +		m->v = m->m = 0;
> +
> +	return m->v & m->m;
> +}
> +
> +static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_kmark *m)
> +{
> +	if (m->m & m->v)
> +		NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_kmark), m);

This doesn't look right. A mark value of 0 with a mask of ~0 won't
be properly dumped. I think this should check for (m->m | m->v).

> +	return 0;
> +
> +nla_put_failure:
> +	return -1;
> +}
> +
>  #endif	/* _NET_XFRM_H */

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