netdev - Re: [PATCH net-next] rtnetlink: delay RTM_DELLINK notification until after ndo

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 2 Dec 2014 11:53:32 -0800
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	Mahesh Bandewar <maheshb@...gle.com>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Subject: Re: [PATCH net-next] rtnetlink: delay RTM_DELLINK notification until
 after ndo_uninit()

On Tue, Dec 2, 2014 at 2:07 AM, Thomas Graf <tgraf@...g.ch> wrote:
> On 12/01/14 at 09:54pm, Mahesh Bandewar wrote:
>> --- a/net/core/rtnetlink.c
>> +++ b/net/core/rtnetlink.c
>> @@ -2220,8 +2220,16 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
>>       return skb->len;
>>  }
>>
>> -void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
>> -               gfp_t flags)
>> +void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
>> +{
>> +     struct net *net = dev_net(dev);
>> +
>> +     rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
>> +}
>> +EXPORT_SYMBOL(rtmsg_ifinfo_send);
>> +
>> +struct sk_buff *rtmsg_ifinfo(int type, struct net_device *dev,
>> +                          unsigned int change, gfp_t flags, bool fill_only)
>>  {
>>       struct net *net = dev_net(dev);
>>       struct sk_buff *skb;
>> @@ -2239,11 +2247,15 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
>>               kfree_skb(skb);
>>               goto errout;
>>       }
>> +     if (fill_only)
>> +         return skb;
>> +
>>       rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
>> -     return;
>> +     return NULL;
>>  errout:
>>       if (err < 0)
>>               rtnl_set_sk_err(net, RTNLGRP_LINK, err);
>> +     return NULL;
>>  }
>
> I think it would be cleaner to introduce a new function, for example
> rtmsg_ifinfo_build_skb() which is called from rtmsg_ifinfo(). The
> single caller that requires delayed sending can use the build skb
> function directly and then send it off.

+1
that would make patch much smaller.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html