/*
 * Netlink helper functions for driver wrappers
 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "priv_netlink.h"
#include "netlink.h"


int netlink_send_oper_ifla(int sock, int ifindex, int linkmode, int operstate)
{
	struct {
		struct nlmsghdr hdr;
		struct ifinfomsg ifinfo;
		char opts[16];
	} req;
	struct rtattr *rta;
	static int nl_seq;
	ssize_t ret;

	os_memset(&req, 0, sizeof(req));

	req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.hdr.nlmsg_type = RTM_SETLINK;
	req.hdr.nlmsg_flags = NLM_F_REQUEST;
	req.hdr.nlmsg_seq = ++nl_seq;
	req.hdr.nlmsg_pid = 0;

	req.ifinfo.ifi_family = AF_UNSPEC;
	req.ifinfo.ifi_type = 0;
	req.ifinfo.ifi_index = ifindex;
	req.ifinfo.ifi_flags = 0;
	req.ifinfo.ifi_change = 0;

	if (linkmode != -1) {
		rta = aliasing_hide_typecast(
			((char *) &req + NLMSG_ALIGN(req.hdr.nlmsg_len)),
			struct rtattr);
		rta->rta_type = IFLA_LINKMODE;
		rta->rta_len = RTA_LENGTH(sizeof(char));
		*((char *) RTA_DATA(rta)) = linkmode;
		req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
			RTA_LENGTH(sizeof(char));
	}
	if (operstate != -1) {
		rta = aliasing_hide_typecast(
			((char *) &req + NLMSG_ALIGN(req.hdr.nlmsg_len)),
			struct rtattr);
		rta->rta_type = IFLA_OPERSTATE;
		rta->rta_len = RTA_LENGTH(sizeof(char));
		*((char *) RTA_DATA(rta)) = operstate;
		req.hdr.nlmsg_len = NLMSG_ALIGN(req.hdr.nlmsg_len) +
			RTA_LENGTH(sizeof(char));
	}

	wpa_printf(MSG_DEBUG, "netlink: Operstate: linkmode=%d, operstate=%d",
		   linkmode, operstate);

	ret = send(sock, &req, req.hdr.nlmsg_len, 0);
	if (ret < 0) {
		wpa_printf(MSG_DEBUG, "netlink: Sending operstate IFLA "
			   "failed: %s (assume operstate is not supported)",
			   strerror(errno));
	}

	return ret < 0 ? -1 : 0;
}