container.c

/* SPDX-License-Identifier: LGPL-2.1-only */
/*
 * 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);
}