Using libnl to create u32 hashkey

[Adrian Ban]

Hi,

I saw that. For this reason I've made a function that set the divisor:

#include <netlink/netlink.h>
#include <netlink/route/tc.h>
#include <netlink/route/classifier.h>
#include "include/rtnl_u32.h"

int rtnl_u32_set_divisor(struct rtnl_cls *mycls, uint16_t divisor)
{

         struct rtnl_u32 *u;

         if (!(u = (struct rtnl_u32*)rtnl_tc_data(TC_CAST(mycls))))
                 return -NLE_NOMEM;

         printf("Mask before set   : 0x%X\n", u->cu_mask);
         u->cu_divisor = divisor;
         u->cu_mask |= U32_ATTR_DIVISOR;
         printf("Divisor is set to : 0x%X\n", u->cu_divisor);
         printf("Mask is set to    : 0x%X\n", u->cu_mask);
         return 0;

}

and the include/rtnl_u32.h contain:

/** @cond SKIP */
#define U32_ATTR_DIVISOR      0x001
#define U32_ATTR_HASH         0x002
#define U32_ATTR_CLASSID      0x004
#define U32_ATTR_LINK         0x008
#define U32_ATTR_PCNT         0x010
#define U32_ATTR_SELECTOR     0x020
#define U32_ATTR_ACTION       0x040
#define U32_ATTR_POLICE       0x080
#define U32_ATTR_INDEV        0x100
/** @endcond */

struct rtnl_u32
{
         uint32_t                cu_divisor;
         uint32_t                cu_hash;
         uint32_t                cu_classid;
         uint32_t                cu_link;
         struct nl_data *        cu_pcnt;
         struct nl_data *        cu_selector;
         struct nl_data *        cu_act;
         struct nl_data *        cu_police;
         char                    cu_indev[IFNAMSIZ];
         int                     cu_mask;
};

I success to add this in filters:

filter parent 1: protocol ip pref 1 u32
filter parent 1: protocol ip pref 1 u32 fh 1: ht divisor 256
filter parent 1: protocol ip pref 1 u32 fh 800: ht divisor 1

I'm still working, but maybe this helps.

Best regards,
Adrian


On 11/22/2011 1:25 PM, Thomas Graf wrote:
> On Mon, Nov 21, 2011 at 11:18:09PM +0200, Adrian Ban wrote:
>> Hi,
>>
>> I'm using libnl3 to a little project. My problem is that I didn't
>> find any documentation about u32 hashkey filters.
>> I want to build something like this:
>>
>> $TC filter add dev $DEVin  parent 0x01:0x0000 prio 1 protocol ip u32
>> $TC filter add dev $DEVin  parent 0x01:0x0000 prio 1 protocol ip
>> handle 1: u32 divisor 256
>>
>> $TC filter add dev $DEVin parent 0x01:0x0000 prio 2 protocol ip u32 \
>>        match ip dst 0.0.0.0/0 \
>>        hashkey mask 0xff000000 at 16 \
>>        link 1:
>> $TC filter add dev $DEVin parent 0x01:0x0000 prio 1 protocol ip
>> handle 2: u32 divisor 256
>> $TC filter add dev $DEVin parent 0x01:0x0000 prio 1 protocol ip u32
>> ht 1:a: \
>>        match ip dst 10.0.0.0/8 \
>>        hashkey mask 0x00FF0000 at 16 \
>>        link 2:
>> $TC filter add dev $DEVin parent 0x01:0x0000 prio 1 protocol ip
>> handle 3: u32 divisor 256
>> $TC filter add dev $DEVin parent 0x01:0x0000 prio 1 protocol ip u32
>> ht 1:2e: \
>>        match ip dst 46.0.0.0/8 \
>>        hashkey mask 0x00FF0000 at 16 \
>>        link 3:
>>
>> There is any solution to make such things with libnl?
> This is not yet fully implemented. For example there is no function that
> would allow setting the divisor yet.
>
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