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ndhc/netlink.h

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Rewrite the netlink handling code to use libmnl. The size cost is very small, and it is hard to do netlink completely correctly as it is poorly documented.
2011-07-02 11:04:50 +05:30
/* netlink.h - netlink physical link notification handling and info retrieval
*
Replace '(c)' with 'Copyright'. '(c)' may not be a valid substitute for 'Copyright' in some legal domains/interpretations. So be safe, since I obviously am asserting copyright on my legal work.
2018-10-26 16:41:16 +05:30
* Copyright 2011-2018 Nicholas J. Kain <njkain at gmail dot com>
Relicense under New BSD (2-clause) license. I don't see any advantage to restricting use unnecessarily, and simple attribution is fine.
2011-07-25 12:00:57 +05:30
* All rights reserved.
Rewrite the netlink handling code to use libmnl. The size cost is very small, and it is hard to do netlink completely correctly as it is poorly documented.
2011-07-02 11:04:50 +05:30
*
Relicense under New BSD (2-clause) license. I don't see any advantage to restricting use unnecessarily, and simple attribution is fine.
2011-07-25 12:00:57 +05:30
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
Rewrite the netlink handling code to use libmnl. The size cost is very small, and it is hard to do netlink completely correctly as it is poorly documented.
2011-07-02 11:04:50 +05:30
*
Relicense under New BSD (2-clause) license. I don't see any advantage to restricting use unnecessarily, and simple attribution is fine.
2011-07-25 12:00:57 +05:30
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
Rewrite the netlink handling code to use libmnl. The size cost is very small, and it is hard to do netlink completely correctly as it is poorly documented.
2011-07-02 11:04:50 +05:30
*
Relicense under New BSD (2-clause) license. I don't see any advantage to restricting use unnecessarily, and simple attribution is fine.
2011-07-25 12:00:57 +05:30
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
Rewrite the netlink handling code to use libmnl. The size cost is very small, and it is hard to do netlink completely correctly as it is poorly documented.
2011-07-02 11:04:50 +05:30
*/
#ifndef NK_NETLINK_H_
#define NK_NETLINK_H_
Remove ifsPrevState and set non-infinite timeout on a send error. We instead check carrier status as needed. This approach is more robust. For a simple example, imagine link state changes that happen while the machine is suspended.
2017-01-12 16:35:00 +05:30
#include <stdbool.h>
Make sure that the netlink socket will never block after program initialization. Fetching if/address/index/mac mappings is done only once at program init, so it is done synchronously as an exception to this rule. Rewrite the netlink handling. Now uses NIH code that should be safe, small, and correct. No external deps FTW.
2011-07-04 03:00:55 +05:30
#include <linux/rtnetlink.h>
Rewrite the netlink handling code to use libmnl. The size cost is very small, and it is hard to do netlink completely correctly as it is poorly documented.
2011-07-02 11:04:50 +05:30
#include "state.h"
Only bring down the interface at startup time if it is not already up and running. ndhc does its job entirely with raw sockets before a lease is established, so it will work just fine, and this change allows for the dhcp client to be re-run without causing downtime on an interface.
2011-07-02 14:28:58 +05:30
enum {
IFS_NONE = 0,
IFS_UP,
IFS_DOWN,
IFS_SHUT,
IFS_REMOVED
};
Remove ifsPrevState and set non-infinite timeout on a send error. We instead check carrier status as needed. This approach is more robust. For a simple example, imagine link state changes that happen while the machine is suspended.
2017-01-12 16:35:00 +05:30
bool nl_event_carrier_wentup(int state);
Replace mostly obsolete -[static 1] with reliable old *-. This notation originally had the sole advantage of implying that the pointer was non-NULL, but it has seen little use and now clang presents warnings about it in certain contexts.
2022-01-12 09:05:19 +05:30
int nl_event_get(struct client_state_t *cs);
Functions don't need explicit extern linkage in headers in C99, as it is the default. Standardize on leaving out the extern keyword as it is less clutter.
2014-03-18 07:40:58 +05:30
int nl_getifdata(void);
Rewrite the netlink handling code to use libmnl. The size cost is very small, and it is hard to do netlink completely correctly as it is poorly documented.
2011-07-02 11:04:50 +05:30
#endif /* NK_NETLINK_H_ */
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