On Fri, Mar 31, 2017 at 06:38:20PM +0800, gfree.w...@foxmail.com wrote:
> +static struct nf_ct_nat_helper pptp_nat = {
> +     .name                   = "pptp_nat",

Why all these with "xyz_nat" names?

This is going to break ctnetlink, as this is the name that identifies
the NAT helper to be used.

> +     .expectfn               = pptp_expectfn,
> +};
> +
>  static void pptp_expectfn(struct nf_conn *ct,
>                        struct nf_conntrack_expect *exp)
>  {
> @@ -221,7 +229,7 @@ static int exp_gre(struct nf_conn *ct, __be16 callid, 
> __be16 peer_callid)
>                         &ct->tuplehash[dir].tuple.src.u3,
>                         &ct->tuplehash[dir].tuple.dst.u3,
>                         IPPROTO_GRE, &peer_callid, &callid);
> -     exp_orig->expectfn = pptp_expectfn;
> +     exp_orig->nat_helper = &pptp_nat;
>  
>       /* reply direction, PAC->PNS */
>       dir = IP_CT_DIR_REPLY;
> @@ -230,7 +238,7 @@ static int exp_gre(struct nf_conn *ct, __be16 callid, 
> __be16 peer_callid)
>                         &ct->tuplehash[dir].tuple.src.u3,
>                         &ct->tuplehash[dir].tuple.dst.u3,
>                         IPPROTO_GRE, &callid, &peer_callid);
> -     exp_reply->expectfn = pptp_expectfn;
> +     exp_reply->nat_helper = &pptp_nat;

Why do we need to attach nat_helper instead of expectfn? I would
prefer we do not.
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