netdev - Re: [PATCH v2] netfilter: x_tables: add xt

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Date:   Fri, 11 Jan 2019 11:09:39 +0800
From:   wenxu <wenxu@...oud.cn>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] netfilter: x_tables: add xt_tunnel match


On 1/11/2019 2:15 AM, Pablo Neira Ayuso wrote:
> On Thu, Jan 10, 2019 at 01:16:08PM +0800, wenxu@...oud.cn wrote:
> [...]
>> +static struct xt_match tunnel_mt_reg __read_mostly = {
>> +	.name           = "tunnel",
>> +	.revision       = 0,
>> +	.family         = NFPROTO_UNSPEC,
>> +	.match          = tunnel_mt,
>> +	.matchsize      = sizeof(struct xt_tunnel_mtinfo),
>> +	.hooks          = ((1 << NF_INET_PRE_ROUTING) |
>> +					  (1 << NF_INET_POST_ROUTING) |
>> +					  (1 << NF_INET_LOCAL_OUT) |
>> +					  (1 << NF_INET_FORWARD)),
> Are you sure this works from the forward chain? This template is
> dropped after the route lookup.
>
> Thanks.

Yes.  NF_INET_FORWARD is also used to match the packet goes to tunnel(IP_TUNNEL_INFO_TX type), After route lookup, the packet send to tunnel through lwtunnel-route.

NF_INET_PRE_ROUTING can be used for 'from' tunnel match, The other three hooks can be used for 'to' tunnel match.