netdev - Re: [patch net-next v3 17/17] rocker: add ndo_bridge_setlnk/getlink support for learning policy

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Date:	Wed, 26 Nov 2014 11:07:09 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
	andy@...yhouse.net, dborkman@...hat.com, ogerlitz@...lanox.com,
	jesse@...ira.com, pshelar@...ira.com, azhou@...ira.com,
	ben@...adent.org.uk, stephen@...workplumber.org,
	jeffrey.t.kirsher@...el.com, vyasevic@...hat.com,
	xiyou.wangcong@...il.com, john.r.fastabend@...el.com,
	edumazet@...gle.com, jhs@...atatu.com, sfeldma@...il.com,
	f.fainelli@...il.com, roopa@...ulusnetworks.com,
	linville@...driver.com, jasowang@...hat.com, ebiederm@...ssion.com,
	nicolas.dichtel@...nd.com, ryazanov.s.a@...il.com,
	buytenh@...tstofly.org, aviadr@...lanox.com, nbd@...nwrt.org,
	alexei.starovoitov@...il.com, Neil.Jerram@...aswitch.com,
	ronye@...lanox.com, simon.horman@...ronome.com,
	alexander.h.duyck@...hat.com, john.ronciak@...el.com,
	mleitner@...hat.com, shrijeet@...il.com, gospo@...ulusnetworks.com,
	bcrl@...ck.org
Subject: Re: [patch net-next v3 17/17] rocker: add ndo_bridge_setlnk/getlink
 support for learning policy

On 11/25/14 at 11:28am, Jiri Pirko wrote:
> @@ -3657,6 +3693,64 @@ skip:
>  	return idx;
>  }
>  
> +static int rocker_port_bridge_setlink(struct net_device *dev,
> +				      struct nlmsghdr *nlh)
> +{
> +	struct rocker_port *rocker_port = netdev_priv(dev);
> +	struct nlattr *protinfo;
> +	struct nlattr *afspec;
> +	struct nlattr *attr;
> +	u16 mode;
> +	int err;
> +
> +	protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
> +				   IFLA_PROTINFO);
> +	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
> +
> +	if (afspec) {
> +		attr = nla_find_nested(afspec, IFLA_BRIDGE_MODE);
> +		if (attr) {
> +			mode = nla_get_u16(attr);
> +			if (mode != BRIDGE_MODE_SWDEV)
> +				return -EINVAL;
> +		}
> +	}

The Netlink message is completely unverified at this point. All
rtnl_bridge_setlink() does is verify that msgsize >= ifinfomsg.
All of the drivers but br_setlink() need fixing in this regard.
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