netdev - Re: [PATCH 2/2] ipv6: use sk_v6_copy_addrs when memcpy struct ipv6

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Message-ID: <528B4701.2070704@huawei.com>
Date:	Tue, 19 Nov 2013 19:09:53 +0800
From:	wangweidong <wangweidong1@...wei.com>
To:	Daniel Borkmann <dborkman@...hat.com>
CC:	<davem@...emloft.net>, <gerrit@....abdn.ac.uk>,
	<kuznet@....inr.ac.ru>, <jmorris@...ei.org>,
	<yoshfuji@...ux-ipv6.org>, <kaber@...sh.net>,
	<vyasevich@...il.com>, <nhorman@...driver.com>,
	<dccp@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-sctp@...r.kernel.org>, <dingtianhong@...wei.com>
Subject: Re: [PATCH 2/2] ipv6: use sk_v6_copy_addrs when memcpy struct ipv6_pinfo

On 2013/11/19 19:04, Daniel Borkmann wrote:
> On 11/19/2013 04:32 AM, wangweidong wrote:
>> On 2013/11/19 11:14, Hannes Frederic Sowa wrote:
>>> On Tue, Nov 19, 2013 at 10:47:27AM +0800, Wang Weidong wrote:
>>>> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
>>>> index 0740f93..83d011e 100644
>>>> --- a/net/ipv6/tcp_ipv6.c
>>>> +++ b/net/ipv6/tcp_ipv6.c
>>>> @@ -1116,6 +1116,10 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
>>>>           newtp = tcp_sk(newsk);
>>>>
>>>>           memcpy(newnp, np, sizeof(struct ipv6_pinfo));
>>>> +        /* Don't forget copy the rcv_saddr and daddr when
>>>> +         * copy ipv6_pinfo.
>>>> +         */
>>>> +        sk_v6_copy_addrs(newsk, sk);
>>>>
>>>>           ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr);
>>>>
>>>
>>> Hmm, how did you spot this?
>>>
>>> Greetings,
>>>
>>>    Hannes
>>>
>>
>> When I did the lksctp-tools(1.0.15)/src/func_tests/test_getname_v6, I got a Segmentation fault.
>> So I try to resolve it. I found the sctp_accept will call sctp_v6_create_accept_sk in IPV6,
>> the function will memcpy the ipv6_pinfo, and not copy the sk_v6_rcv_saddr. But the getsockname
>> will read the sk_v6_rcv_saddr, and the value is not true.
> 
> In SCTP code, "newsk->sk_v6_daddr = oldsk->sk_v6_daddr;" is redundant as it's already
> done by "sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);" for the primary path,
> after we're doing the full copy of struct ipv6_pinfo to the new socket in
> sctp_v6_create_accept_sk(). I've sent out an updated patch for SCTP.
> 

Yeah, I had seen it. And I Acked-by it.
Thanks. 

> .
> 


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