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On Wed, Sep 2, 2009 at 16:54, Patrick McHardy<kaber@xxxxxxxxx> wrote:
> Hannes Eder wrote:
>> This implements the kernel-space side of the netfilter matcher
>> xt_ipvs.
>
> Looks mostly fine to me, just one question:
>
>> +bool ipvs_mt(const struct sk_buff *skb, const struct xt_match_param *par)
>> +{
>> + const struct xt_ipvs *data = par->matchinfo;
>> + const u_int8_t family = par->family;
>> + struct ip_vs_iphdr iph;
>> + struct ip_vs_protocol *pp;
>> + struct ip_vs_conn *cp;
>> + int af;
>> + bool match = true;
>> +
>> + if (data->bitmask == XT_IPVS_IPVS_PROPERTY) {
>> + match = skb->ipvs_property ^
>> + !!(data->invert & XT_IPVS_IPVS_PROPERTY);
>> + goto out;
>> + }
>> +
>> + /* other flags than XT_IPVS_IPVS_PROPERTY are set */
>> + if (!skb->ipvs_property) {
>> + match = false;
>> + goto out;
>> + }
>> +
>> + switch (skb->protocol) {
>> + case htons(ETH_P_IP):
>> + af = AF_INET;
>> + break;
>> +#ifdef CONFIG_IP_VS_IPV6
>> + case htons(ETH_P_IPV6):
>> + af = AF_INET6;
>> + break;
>> +#endif
>> + default:
>> + match = false;
>> + goto out;
>> + }
>
> In the NF_INET_LOCAL_OUT hook skb->protocol is invalid. So if you
> don't need this, it would make sense to restrict the match to the
> other hooks.
>
> Even easier would be to use par->family, which contains the address
> family and doesn't need any translation.
Nice, I'll use par->family.
So in theory I do not even need a check like the following in the beginning?
if (family != NFPROTO_IPV4
#ifdef CONFIG_IP_VS_IPV6
&& family != NFPROTO_IPV6
#endif
) {
match = false;
goto out;
}
Thanks,
-Hannes
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