netdev - Re: [PATCH net-next v2 0/7] netns: ease netlink use with a lot of netns

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Message-ID: <554E7705.2070707@6wind.com>
Date:	Sat, 09 May 2015 23:07:17 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	netdev@...r.kernel.org, tgraf@...g.ch, davem@...emloft.net
Subject: Re: [PATCH net-next v2 0/7] netns: ease netlink use with a lot of
 netns

Le 08/05/2015 14:02, Eric W. Biederman a écrit :
>
> So I am dense.  I have read through the patches and I don't see where
> you tag packets from other network namespaces with a network namespace
> id.
In patch #7, the netns id is put in the skb cb (NETLINK_CB) in the function
do_one_broadcast().
The function netlink_cmsg_listen_all_nsid() will send this information to the
userland via a cmsg data. This function is called by netlink_recvmsg().

> In fact I don't even see an attribute that is approrpriate for such
> tagging.
The netns id is the same attribute that allows to identify a peer netns
via rtnetlink.


Regards,
Nicolas
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