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

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Date:	Mon, 18 Nov 2013 19:58:58 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	wangweidong <wangweidong1@...wei.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 Tue, 2013-11-19 at 11:32 +0800, 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.

But sctp is not tcp ;)

sctp_copy_sock() is doing some clever/partial copy of the socket, so
please fix it ;)

No idea why it's not doing the normal copy of the socket.



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