Subject: Re: [PATCHv3 net-next 2/5] {IPv4,xfrm} Add ESN support for AH ingress part

From: Fan Du <[email-masked]>
Date: Tue, 14 Jan 2014 18:01:32 +0800

On 2014年01月14日 17:54, Steffen Klassert wrote:
> On Tue, Jan 14, 2014 at 09:39:09AM +0800, Fan Du wrote:
>> @@ -381,7 +393,14 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
>>   	sg_init_table(sg, nfrags);
>>   	skb_to_sgvec(skb, sg, 0, skb->len);
>>
>> -	ahash_request_set_crypt(req, sg, icv, skb->len);
>> +	if (x->props.flags&  XFRM_STATE_ESN) {
>> +		sg_unmark_end(&sg[nfrags - 1]);
>> +		/* Attach seqhi sg right after packet payload */
>> +		*seqhi = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
>
> This is ah_input(), so you should use the high bits of the input
> sequence number here. The ipv6 patch has the same problem.

ok, I will fix this.

>
>> +		sg_init_table(seqhisg, sglists);
>
> Why do you add a separate SG table for this?

It just initialize a single seqhisg, which is actually followed behind packet payload sg table.
initialized seqhisg actually mark itself as the end of sg list.

-- 
浮沉随浪只记今朝笑

--fan