netdev - Re: [Patch net-next v1 3/4] vxlan: add ipv6 support

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Date:	Mon, 1 Apr 2013 13:14:50 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Cong Wang <amwang@...hat.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net-next v1 3/4] vxlan: add ipv6 support

On Sun, 31 Mar 2013 13:43:44 +0800
Cong Wang <amwang@...hat.com> wrote:

>  	/* Need to drop RTNL to call multicast leave */
>  	rtnl_unlock();
> -	lock_sock(sk);
> -	err = ip_mc_leave_group(sk, &mreq);
> +	if (vxlan->gaddr.proto == htons(ETH_P_IP)) {
> +		lock_sock(sk);
> +		err = ip_mc_leave_group(sk, &mreq);
> +	} else {
> +#if IS_ENABLED(CONFIG_IPV6)
> +		lock_sock(sk);
> +		err = ipv6_sock_mc_drop(sk, vxlan->link, &vxlan->gaddr.ip6);
> +#endif
> +	}
>  	release_sock(sk);

Since both v4 and v6 need socket locked why not?

	rtnl_unlock();
	lock_sock(sk);
	if (vxlan->gaddr.proto == htons(ETH_P_IP)) 
		err = ip_mc_leave_group(sk, &mreq);
if IS_ENABLED(CONFIG_IPV6)
	else
		err = ipv6_sock_mc_drop(sk, vxlan->link, &vxlan->gaddr.ip6);
#endif

  	release_sock(sk);
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