ip6tnl: do route updating for redirect in ip6_tnl_err()

From: Duan Jiong <duanj.fnst@cn.fujitsu.com>

After the ip6_tnl_err() is called, the rel_msg is assigned
to 0, and the ip4ip6_err()will return directly, the instruction
below will not be executed.

In rfc2473, we can know that the tunnel ICMP redirect
message should not be reported to the source of the
original packet, so we can handle it in ip4ip6_err().

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
---
 net/ipv6/ip6_tunnel.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

于 2013/9/18 20:05, Duan Jiong 写道:
> From: Duan Jiong <duanj.fnst@cn.fujitsu.com>
>
> After the ip6_tnl_err() is called, the rel_msg is assigned
> to 0, and the ip4ip6_err()will return directly, the instruction
> below will not be executed.
>
> In rfc2473, we can know that the tunnel ICMP redirect
> message should not be reported to the source of the
> original packet, so we can handle it in ip4ip6_err().
>
> Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
> ---
>  net/ipv6/ip6_tunnel.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
> index 2d8f482..35c4b70 100644
> --- a/net/ipv6/ip6_tunnel.c
> +++ b/net/ipv6/ip6_tunnel.c
> @@ -529,6 +529,9 @@ ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
>  			rel_msg = 1;
>  		}
>  		break;
> +	case NDISC_REDIRECT:
> +		ip6_redirect(skb, net, 0, 0);
sorry, it should be

ip6_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0);
> +		break;
>  	}
>  
>  	*type = rel_type;
> @@ -576,9 +579,6 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
>  		rel_type = ICMP_DEST_UNREACH;
>  		rel_code = ICMP_FRAG_NEEDED;
>  		break;
> -	case NDISC_REDIRECT:
> -		rel_type = ICMP_REDIRECT;
> -		rel_code = ICMP_REDIR_HOST;
>  	default:
>  		return 0;
>  	}
> @@ -637,8 +637,6 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
>  
>  		skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
>  	}
> -	if (rel_type == ICMP_REDIRECT)
> -		skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
>  
>  	icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
>  

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