netdev - Re: [PATCH net-next 5/5] ipv6: RFC 4884 partial support for SIT/GRE tunnels

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Date:	Sat, 18 Jun 2016 20:54:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	edumazet@...gle.com
Cc:	netdev@...r.kernel.org, ghorbel@...asoftware.com,
	eric.dumazet@...il.com
Subject: Re: [PATCH net-next 5/5] ipv6: RFC 4884 partial support for
 SIT/GRE tunnels

From: Eric Dumazet <edumazet@...gle.com>
Date: Sat, 18 Jun 2016 16:26:40 -0700

> @@ -588,12 +594,26 @@ int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type)
>  		skb2->dev = rt->dst.dev;
>  
>  	ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &temp_saddr);
> +
> +	if (data_len) {
> +		/* RFC 4884 (partial) support :
> +		 * insert 0 padding at the end, before the extensions
> +		 */
> +		__skb_push(skb2, nhs);
> +		skb_reset_network_header(skb2);
> +		memcpy(skb2->data, skb2->data + nhs, data_len - nhs);

Since this is overlapping, it really need to use memmove() instead of
memcpy().