netdev - Re: [PATCH ipsec-next 03/11] xfrm: remove input indirection from xfrm

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Date:   Thu, 28 Mar 2019 12:39:01 +0100
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     Florian Westphal <fw@...len.de>
Cc:     netdev@...r.kernel.org, steffen.klassert@...unet.com
Subject: Re: [PATCH ipsec-next 03/11] xfrm: remove input indirection from
 xfrm_mode

2019-03-27, 18:31:32 +0100, Florian Westphal wrote:
> diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
> index ea5ac053c15d..e3c7edd11e77 100644
> --- a/net/xfrm/xfrm_input.c
> +++ b/net/xfrm/xfrm_input.c
> @@ -186,6 +186,74 @@ int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
>  }
>  EXPORT_SYMBOL(xfrm_prepare_input);
>  
> +/* Remove encapsulation header.
> + *
> + * The IP header will be moved over the top of the encapsulation header.
> + *
> + * On entry, skb->h shall point to where the IP header should be and skb->nh
> + * shall be set to where the IP header currently is.  skb->data shall point
> + * to the start of the payload.
> + */
> +static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
> +{
> +#if IS_ENABLED(CONFIG_INET4_XFRM_MODE_TRANSPORT)

Nit: that should be CONFIG_INET_XFRM_MODE_TRANSPORT (without 4), and
in patch 10.

> +	int ihl = skb->data - skb_transport_header(skb);
> +
> +	if (skb->transport_header != skb->network_header) {
> +		memmove(skb_transport_header(skb),
> +			skb_network_header(skb), ihl);
> +		skb->network_header = skb->transport_header;
> +	}
> +	ip_hdr(skb)->tot_len = htons(skb->len + ihl);
> +	skb_reset_transport_header(skb);
> +	return 0;
> +#else
> +	return -EOPNOTSUPP;
> +#endif
> +}

-- 
Sabrina