netdev - Re: [PATCH 2/2] ipv6: fix packet corruption when Dest/RT2 options are used

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Date:	Mon, 07 Jan 2013 11:49:51 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Romain KUNTZ <r.kuntz@...lavors.com>
CC:	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org,
	davem@...emloft.net,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [PATCH 2/2] ipv6: fix packet corruption when Dest/RT2 options
 are used

Le 05/01/2013 17:19, Romain KUNTZ a écrit :
> Commit 299b0767 (ipv6: Fix IPsec slowpath fragmentation problem)
Add Steffen into CC, he is the author of this patch and the IPsec
maintainer.

> has introduced a bug that provokes corrupted packets when Destination
> Options or Routing Header Type 2 are used (such as with Mobile IPv6):
> rt->rt6i_nfheader_len should be substracted to rt->dst.header_len,
> and not to exthdrlen.
>
> This patch reverts to the original and correct behavior. Successfully
> tested with and without IPsec activated for MH packets.
>
> Signed-off-by: Romain Kuntz <r.kuntz@...lavors.com>
> ---
>   net/ipv6/ip6_output.c |    4 ++--
>   1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
> index 5552d13..0c7c03d 100644
> --- a/net/ipv6/ip6_output.c
> +++ b/net/ipv6/ip6_output.c
> @@ -1213,10 +1213,10 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
>   		if (dst_allfrag(rt->dst.path))
>   			cork->flags |= IPCORK_ALLFRAG;
>   		cork->length = 0;
> -		exthdrlen = (opt ? opt->opt_flen : 0) - rt->rt6i_nfheader_len;
> +		exthdrlen = (opt ? opt->opt_flen : 0);
>   		length += exthdrlen;
>   		transhdrlen += exthdrlen;
> -		dst_exthdrlen = rt->dst.header_len;
> +		dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len;
>   	} else {
>   		rt = (struct rt6_info *)cork->dst;
>   		fl6 = &inet->cork.fl.u.ip6;
>
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