container.c

/*
 * lib/route/cls/ematch/container.c     Container Ematch
 *
 *      This library is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU Lesser General Public
 *      License as published by the Free Software Foundation version 2.1
 *      of the License.
 *
 * Copyright (c) 2008-2013 Thomas Graf <tgraf@suug.ch>
 */

#include <netlink-private/netlink.h>
#include <netlink-private/tc.h>
#include <netlink/netlink.h>
#include <netlink/route/cls/ematch.h>

static int container_parse(struct rtnl_ematch *e, void *data, size_t len __attribute__((unused)))
{
        /*
        The kernel may provide more than 4 bytes of data in the future and we want
        older libnl versions to be ok with that. We want interfaces to be growable
        so we only ever enforce a minimum data length and copy as much as we are
        aware of. Thomas Graf.
        */
        memcpy(e->e_data, data, sizeof(uint32_t));

        return 0;
}

static int container_fill(struct rtnl_ematch *e, struct nl_msg *msg)
{
        return nlmsg_append(msg, e->e_data, sizeof(uint32_t), 0);
}

static struct rtnl_ematch_ops container_ops = {
        .eo_kind        = TCF_EM_CONTAINER,
        .eo_name        = "container",
        .eo_minlen      = sizeof(uint32_t),
        .eo_datalen     = sizeof(uint32_t),
        .eo_parse       = container_parse,
        .eo_fill        = container_fill,
};

static void __init container_init(void)
{
        rtnl_ematch_register(&container_ops);
}