netdev - Re: [PATCH net-next 1/3] net/sched: Introduce action ct

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Date:   Thu, 20 Jun 2019 07:07:07 +0000
From:   Paul Blakey <paulb@...lanox.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
CC:     Jiri Pirko <jiri@...lanox.com>, Roi Dayan <roid@...lanox.com>,
        Yossi Kuperman <yossiku@...lanox.com>,
        Oz Shlomo <ozsh@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Aaron Conole <aconole@...hat.com>,
        Zhike Wang <wangzhike@...com>,
        Rony Efraim <ronye@...lanox.com>,
        "nst-kernel@...hat.com" <nst-kernel@...hat.com>,
        John Hurley <john.hurley@...ronome.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Justin Pettit <jpettit@....org>
Subject: Re: [PATCH net-next 1/3] net/sched: Introduce action ct


On 6/19/2019 9:33 PM, Marcelo Ricardo Leitner wrote:
> On Tue, Jun 11, 2019 at 04:28:31PM +0300, Paul Blakey wrote:
> ...
>> +static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
>> +				  struct tc_ct *parm,
>> +				  struct nlattr **tb,
>> +				  struct netlink_ext_ack *extack)
>> +{
>> +	struct nf_nat_range2 *range;
>> +
>> +	if (!(p->ct_action & TCA_CT_ACT_NAT))
>> +		return 0;
>> +
>> +	if (!IS_ENABLED(CONFIG_NF_NAT)) {
>> +		NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
>> +		return -EOPNOTSUPP;
>> +	}
>> +
>> +	if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
>> +		return 0;
>> +
>> +	if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
>> +	    (p->ct_action & TCA_CT_ACT_NAT_DST)) {
>> +		NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
>> +		return -EOPNOTSUPP;
>> +	}
>> +
>> +	range = &p->range;
>> +	if (tb[TCA_CT_NAT_IPV4_MIN]) {
>> +		range->min_addr.ip =
>> +			nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);
>> +		range->flags |= NF_NAT_RANGE_MAP_IPS;
>> +		p->ipv4_range = true;
>> +	}
>> +	if (tb[TCA_CT_NAT_IPV4_MAX]) {
>> +		range->max_addr.ip =
>> +			nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MAX]);
>> +		range->flags |= NF_NAT_RANGE_MAP_IPS;
>> +		p->ipv4_range = true;
>> +	} else if (range->min_addr.ip) {
>> +		range->max_addr.ip = range->min_addr.ip;
>> +	}
>> +
>> +	if (tb[TCA_CT_NAT_IPV6_MIN]) {
>> +		range->min_addr.in6 =
>> +			nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);
>> +		range->flags |= NF_NAT_RANGE_MAP_IPS;
>> +		p->ipv4_range = false;
>> +	}
>> +	if (tb[TCA_CT_NAT_IPV6_MAX]) {
>> +		range->max_addr.in6 =
>> +			nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MAX]);
>> +		range->flags |= NF_NAT_RANGE_MAP_IPS;
>> +		p->ipv4_range = false;
>> +	} else if (memchr_inv(&range->min_addr.in6, 0,
>> +		   sizeof(range->min_addr.in6))) {
>> +		range->max_addr.in6 = range->min_addr.in6;
> This will overwrite ipv4_max if it was used, as min/max_addr are
> unions.
> What about having the _MAX handling (for both ipv4/6) inside the
>   if (.._MIN) { }  block ?

Yes that what I planned on doing:

         range = &p->range;
         if (tb[TCA_CT_NAT_IPV4_MIN]) {
                 p->ipv4_range = true;
                 range->flags |= NF_NAT_RANGE_MAP_IPS;
                 range->min_addr.ip =
                         nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);

                 range->max_addr.ip = tb[TCA_CT_NAT_IPV4_MAX] ?
nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MAX]) :
                                      range->min_addr.ip;
         } else if (tb[TCA_CT_NAT_IPV6_MIN]) {
                 p->ipv4_range = false;
                 range->flags |= NF_NAT_RANGE_MAP_IPS;
                 range->min_addr.in6 =
                         nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);

                 range->max_addr.in6 = tb[TCA_CT_NAT_IPV6_MAX] ?
nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MAX]) :
                                       range->min_addr.in6;
         }

         if (tb[TCA_CT_NAT_PORT_MIN]) {
                 range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
                 range->min_proto.all = 
nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]);

                 range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX]?
nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) :
                                        range->min_proto.all;





>> +	}
>> +