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/**
* @file rtnl.h
* @brief Interface link status via RT netlink
* @note Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef HAVE_RTNL_H
#define HAVE_RTNL_H
#include <net/if.h>
typedef void (*rtnl_callback)(void *ctx, int linkup, int ts_index);
/**
* Close a RT netlink socket.
* @param fd A socket obtained via rtnl_open().
* @return Zero on success, non-zero otherwise.
*/
int rtnl_close(int fd);
/**
* Get name of the slave interface which timestamps packets going through
* a master interface (e.g. bond0)
* @param device Name of the master interface.
* @param ts_device Buffer for the name of the slave interface, which must be
* at least IF_NAMESIZE bytes long.
* @return Zero on success, or -1 on error.
*/
int rtnl_get_ts_device(const char *device, char ts_device[IF_NAMESIZE]);
/**
* Request the link status from the kernel.
* @param fd A socket obtained via rtnl_open().
* @param device Interface name. Request all iface's status if set NULL.
* @return Zero on success, non-zero otherwise.
*/
int rtnl_link_query(int fd, const char *device);
/**
* Read kernel messages looking for a link up/down events.
* @param fd Readable socket obtained via rtnl_open().
* @param device The device which we need to get link info.
* @param cb Callback function to be invoked on each event.
* @param ctx Private context passed to the callback.
* @return Zero on success, non-zero otherwise.
*/
int rtnl_link_status(int fd, const char *device, rtnl_callback cb, void *ctx);
/**
* Check if the PHC is a virtual clock of the interface (i.e. sockets bound to
* the interface also need to be bound to the clock).
* @param device Name of the interface.
* @param phc_index Index of the clock to check.
* @return 1 if true, otherwise 0.
*/
int rtnl_iface_has_vclock(const char *device, int phc_index);
/**
* Open a RT netlink socket for monitoring link state.
* @return A valid socket, or -1 on error.
*/
int rtnl_open(void);
#endif
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