netdev - Re: [PATCH v3 net-next 3/4] soreuseport: setsockopt SO_ATTACH_REUSEPORT

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Message-ID: <20160104201149.GA33051@ast-mbp.thefacebook.com>
Date:	Mon, 4 Jan 2016 12:11:50 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Craig Gallek <kraigatgoog@...il.com>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [PATCH v3 net-next 3/4] soreuseport: setsockopt
 SO_ATTACH_REUSEPORT_[CE]BPF

On Mon, Jan 04, 2016 at 11:26:37AM -0500, Craig Gallek wrote:
> From: Craig Gallek <kraig@...gle.com>
> 
> Expose socket options for setting a classic or extended BPF program
> for use when selecting sockets in an SO_REUSEPORT group.  These options
> can be used on the first socket to belong to a group before bind or
> on any socket in the group after bind.
> 
> This change includes refactoring of the existing sk_filter code to
> allow reuse of the existing BPF filter validation checks.
> 
> Signed-off-by: Craig Gallek <kraig@...gle.com>
...
> +	/* temporarily advance data past protocol header */
> +	if (!pskb_may_pull(skb, hdr_len) || !pskb_pull(skb, hdr_len)) {
> +		consume_skb(nskb);
> +		return NULL;
> +	}

pskb_pull() includes pskb_may_pull().

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