1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010 Rui Paulo <rpaulo@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: releng/12.0/sys/net80211/ieee80211_ratectl.c 326272 2017-11-27 15:23:17Z pfg $");
30
31#include <sys/param.h>
32#include <sys/kernel.h>
33#include <sys/sbuf.h>
34#include <sys/systm.h>
35#include <sys/socket.h>
36#include <sys/malloc.h>
37
38#include <net/if.h>
39#include <net/if_media.h>
40#include <net/ethernet.h>
41#include <net/route.h>
42
43#include <net80211/ieee80211_var.h>
44#include <net80211/ieee80211_ratectl.h>
45
46static const struct ieee80211_ratectl *ratectls[IEEE80211_RATECTL_MAX];
47
48static const char *ratectl_modnames[IEEE80211_RATECTL_MAX] = {
49	[IEEE80211_RATECTL_AMRR]	= "wlan_amrr",
50	[IEEE80211_RATECTL_RSSADAPT]	= "wlan_rssadapt",
51	[IEEE80211_RATECTL_ONOE]	= "wlan_onoe",
52	[IEEE80211_RATECTL_SAMPLE]	= "wlan_sample",
53	[IEEE80211_RATECTL_NONE]	= "wlan_none",
54};
55
56MALLOC_DEFINE(M_80211_RATECTL, "80211ratectl", "802.11 rate control");
57
58void
59ieee80211_ratectl_register(int type, const struct ieee80211_ratectl *ratectl)
60{
61	if (type >= IEEE80211_RATECTL_MAX)
62		return;
63	ratectls[type] = ratectl;
64}
65
66void
67ieee80211_ratectl_unregister(int type)
68{
69	if (type >= IEEE80211_RATECTL_MAX)
70		return;
71	ratectls[type] = NULL;
72}
73
74static void
75ieee80211_ratectl_sysctl_stats_node_iter(void *arg, struct ieee80211_node *ni)
76{
77
78	struct sbuf *sb = (struct sbuf *) arg;
79	sbuf_printf(sb, "MAC: %6D\n", ni->ni_macaddr, ":");
80	ieee80211_ratectl_node_stats(ni, sb);
81	sbuf_printf(sb, "\n");
82}
83
84static int
85ieee80211_ratectl_sysctl_stats(SYSCTL_HANDLER_ARGS)
86{
87	struct ieee80211vap *vap = arg1;
88	struct ieee80211com *ic = vap->iv_ic;
89	struct sbuf sb;
90	int error;
91
92	error = sysctl_wire_old_buffer(req, 0);
93	if (error)
94		return (error);
95#ifndef __HAIKU__
96	// sysctl not used in Haiku, no need to compute the stats
97	sbuf_new_for_sysctl(&sb, NULL, 8, req);
98	sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
99
100	IEEE80211_LOCK(ic);
101	ieee80211_iterate_nodes(&ic->ic_sta,
102	    ieee80211_ratectl_sysctl_stats_node_iter,
103	    &sb);
104	IEEE80211_UNLOCK(ic);
105
106	error = sbuf_finish(&sb);
107	sbuf_delete(&sb);
108#endif
109	return (error);
110}
111
112void
113ieee80211_ratectl_init(struct ieee80211vap *vap)
114{
115	if (vap->iv_rate == ratectls[IEEE80211_RATECTL_NONE])
116		ieee80211_ratectl_set(vap, IEEE80211_RATECTL_AMRR);
117	vap->iv_rate->ir_init(vap);
118
119	/* Attach generic stats sysctl */
120	SYSCTL_ADD_PROC(vap->iv_sysctl, SYSCTL_CHILDREN(vap->iv_oid), OID_AUTO,
121	    "rate_stats", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, vap,
122	    0, ieee80211_ratectl_sysctl_stats, "A", "ratectl node stats");
123}
124
125void
126ieee80211_ratectl_set(struct ieee80211vap *vap, int type)
127{
128	if (type >= IEEE80211_RATECTL_MAX)
129		return;
130	if (ratectls[type] == NULL) {
131		ieee80211_load_module(ratectl_modnames[type]);
132		if (ratectls[type] == NULL) {
133			IEEE80211_DPRINTF(vap, IEEE80211_MSG_RATECTL,
134			    "%s: unable to load algo %u, module %s\n",
135			    __func__, type, ratectl_modnames[type]);
136			vap->iv_rate = ratectls[IEEE80211_RATECTL_NONE];
137			return;
138		}
139	}
140	vap->iv_rate = ratectls[type];
141}
142