1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
29#include <sys/kernel.h>
30#include <sys/sbuf.h>
31#include <sys/systm.h>
32#include <sys/socket.h>
33#include <sys/malloc.h>
34
35#include <net/if.h>
36#include <net/if_media.h>
37#include <net/ethernet.h>
38#include <net/route.h>
39
40#include <net80211/ieee80211_var.h>
41#include <net80211/ieee80211_ratectl.h>
42
43static const struct ieee80211_ratectl *ratectls[IEEE80211_RATECTL_MAX];
44
45static const char *ratectl_modnames[IEEE80211_RATECTL_MAX] = {
46	[IEEE80211_RATECTL_AMRR]	= "wlan_amrr",
47	[IEEE80211_RATECTL_RSSADAPT]	= "wlan_rssadapt",
48	[IEEE80211_RATECTL_ONOE]	= "wlan_onoe",
49	[IEEE80211_RATECTL_SAMPLE]	= "wlan_sample",
50	[IEEE80211_RATECTL_NONE]	= "wlan_none",
51};
52
53MALLOC_DEFINE(M_80211_RATECTL, "80211ratectl", "802.11 rate control");
54
55void
56ieee80211_ratectl_register(int type, const struct ieee80211_ratectl *ratectl)
57{
58	if (type >= IEEE80211_RATECTL_MAX)
59		return;
60	ratectls[type] = ratectl;
61}
62
63void
64ieee80211_ratectl_unregister(int type)
65{
66	if (type >= IEEE80211_RATECTL_MAX)
67		return;
68	ratectls[type] = NULL;
69}
70
71static void
72ieee80211_ratectl_sysctl_stats_node_iter(void *arg, struct ieee80211_node *ni)
73{
74
75	struct sbuf *sb = (struct sbuf *) arg;
76	sbuf_printf(sb, "MAC: %6D\n", ni->ni_macaddr, ":");
77	ieee80211_ratectl_node_stats(ni, sb);
78	sbuf_printf(sb, "\n");
79}
80
81static int
82ieee80211_ratectl_sysctl_stats(SYSCTL_HANDLER_ARGS)
83{
84	struct ieee80211vap *vap = arg1;
85	struct ieee80211com *ic = vap->iv_ic;
86	struct sbuf sb;
87	int error;
88
89	error = sysctl_wire_old_buffer(req, 0);
90	if (error)
91		return (error);
92	sbuf_new_for_sysctl(&sb, NULL, 8, req);
93	sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
94
95	IEEE80211_LOCK(ic);
96	ieee80211_iterate_nodes(&ic->ic_sta,
97	    ieee80211_ratectl_sysctl_stats_node_iter,
98	    &sb);
99	IEEE80211_UNLOCK(ic);
100
101	error = sbuf_finish(&sb);
102	sbuf_delete(&sb);
103	return (error);
104}
105
106void
107ieee80211_ratectl_init(struct ieee80211vap *vap)
108{
109	if (vap->iv_rate == ratectls[IEEE80211_RATECTL_NONE])
110		ieee80211_ratectl_set(vap, IEEE80211_RATECTL_AMRR);
111	vap->iv_rate->ir_init(vap);
112
113	/* Attach generic stats sysctl */
114	SYSCTL_ADD_PROC(vap->iv_sysctl, SYSCTL_CHILDREN(vap->iv_oid), OID_AUTO,
115	    "rate_stats", CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, vap,
116	    0, ieee80211_ratectl_sysctl_stats, "A", "ratectl node stats");
117}
118
119void
120ieee80211_ratectl_set(struct ieee80211vap *vap, int type)
121{
122	if (type >= IEEE80211_RATECTL_MAX)
123		return;
124	if (ratectls[type] == NULL) {
125		ieee80211_load_module(ratectl_modnames[type]);
126		if (ratectls[type] == NULL) {
127			IEEE80211_DPRINTF(vap, IEEE80211_MSG_RATECTL,
128			    "%s: unable to load algo %u, module %s\n",
129			    __func__, type, ratectl_modnames[type]);
130			vap->iv_rate = ratectls[IEEE80211_RATECTL_NONE];
131			return;
132		}
133	}
134	vap->iv_rate = ratectls[type];
135}
136