netdev - Re: [PATCH] ipv6: fix incorrect ipsec transport mode fragment

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Message-ID: <4FB4ABC8.5000506@cn.fujitsu.com>
Date:	Thu, 17 May 2012 15:42:00 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	steffen.klassert@...unet.com, netdev@...r.kernel.org,
	lw@...fujitsu.com
Subject: Re: [PATCH] ipv6: fix incorrect ipsec transport mode fragment

于 2012年05月15日 06:41, David Miller 写道:
> From: Steffen Klassert <steffen.klassert@...unet.com>
> Date: Mon, 14 May 2012 15:05:28 +0200
> 
>> There might be other opinions, but I don't like to see this IPsec mode
>> dependent stuff hacked into the generic ipv6 output path.
> 
> Completely agreed.

Hi David

how do you think about adding function pointer to struct xfrm_mode?
when prefering xfrm_mode,there must be some ipsec codes in the generic ipv6 output
path,just like below.it looks ugly.

int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
        int offset, int len, int odd, struct sk_buff *skb),
        void *from, int length, int transhdrlen,
        int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
        struct rt6_info *rt, unsigned int flags, int dontfrag)
{
#ifdef CONFIG_XFRM
        struct xfrm_state *x = rt->dst.xfrm;
        if (x && x->outer_mode && x->outer_mode->append_data) {
                x->outer_mode->append_data(...);
        } else
#endif
                __ip6_append_data(...);
}

I want to use one bit of rt6_info->rt6i_flags to identify the actions we should
do in ip6_append_data. BUT it seems not what the rt6i_flags should do.this may
make rt6i_flags in chaos.

What's your comment?

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