870 lines
24 KiB
C
870 lines
24 KiB
C
/*-
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* Copyright (c) 2001 Atsushi Onoe
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* Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* IEEE 802.11 generic handler
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*/
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/endian.h>
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#include <sys/errno.h>
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#include <sys/bus.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <machine/atomic.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_media.h>
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#include <net/if_arp.h>
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#include <net/ethernet.h>
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#include <net/if_llc.h>
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#include <net80211/ieee80211_var.h>
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#include <net/bpf.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#endif
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#ifdef IEEE80211_DEBUG
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int ieee80211_debug = 0;
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SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug,
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0, "IEEE 802.11 media debugging printfs");
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#endif
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static void ieee80211_set11gbasicrates(struct ieee80211_rateset *,
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enum ieee80211_phymode);
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static const char *ieee80211_phymode_name[] = {
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"auto", /* IEEE80211_MODE_AUTO */
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"11a", /* IEEE80211_MODE_11A */
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"11b", /* IEEE80211_MODE_11B */
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"11g", /* IEEE80211_MODE_11G */
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"turbo", /* IEEE80211_MODE_TURBO */
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};
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void
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ieee80211_ifattach(struct ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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struct ieee80211_channel *c;
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int i;
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ether_ifattach(ifp, ic->ic_myaddr);
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bpfattach2(ifp, DLT_IEEE802_11,
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sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf);
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ieee80211_crypto_attach(ifp);
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/*
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* Fill in 802.11 available channel set, mark
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* all available channels as active, and pick
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* a default channel if not already specified.
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*/
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memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
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ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO;
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for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
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c = &ic->ic_channels[i];
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if (c->ic_flags) {
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/*
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* Verify driver passed us valid data.
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*/
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if (i != ieee80211_chan2ieee(ic, c)) {
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if_printf(ifp, "bad channel ignored; "
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"freq %u flags %x number %u\n",
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c->ic_freq, c->ic_flags, i);
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c->ic_flags = 0; /* NB: remove */
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continue;
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}
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setbit(ic->ic_chan_avail, i);
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/*
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* Identify mode capabilities.
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*/
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if (IEEE80211_IS_CHAN_A(c))
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ic->ic_modecaps |= 1<<IEEE80211_MODE_11A;
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if (IEEE80211_IS_CHAN_B(c))
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ic->ic_modecaps |= 1<<IEEE80211_MODE_11B;
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if (IEEE80211_IS_CHAN_PUREG(c))
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ic->ic_modecaps |= 1<<IEEE80211_MODE_11G;
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if (IEEE80211_IS_CHAN_T(c))
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ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO;
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}
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}
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/* validate ic->ic_curmode */
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if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0)
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ic->ic_curmode = IEEE80211_MODE_AUTO;
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(void) ieee80211_setmode(ic, ic->ic_curmode);
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ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */
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if (ic->ic_lintval == 0)
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ic->ic_lintval = 100; /* default sleep */
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ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */
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ieee80211_node_attach(ifp);
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ieee80211_proto_attach(ifp);
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}
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void
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ieee80211_ifdetach(struct ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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ieee80211_proto_detach(ifp);
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ieee80211_crypto_detach(ifp);
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ieee80211_node_detach(ifp);
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ifmedia_removeall(&ic->ic_media);
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bpfdetach(ifp);
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ether_ifdetach(ifp);
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}
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/*
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* Convert MHz frequency to IEEE channel number.
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*/
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u_int
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ieee80211_mhz2ieee(u_int freq, u_int flags)
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{
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if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
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if (freq == 2484)
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return 14;
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if (freq < 2484)
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return (freq - 2407) / 5;
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else
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return 15 + ((freq - 2512) / 20);
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} else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */
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return (freq - 5000) / 5;
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} else { /* either, guess */
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if (freq == 2484)
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return 14;
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if (freq < 2484)
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return (freq - 2407) / 5;
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if (freq < 5000)
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return 15 + ((freq - 2512) / 20);
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return (freq - 5000) / 5;
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}
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}
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/*
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* Convert channel to IEEE channel number.
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*/
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u_int
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ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c)
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{
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if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX])
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return c - ic->ic_channels;
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else if (c == IEEE80211_CHAN_ANYC)
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return IEEE80211_CHAN_ANY;
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else if (c != NULL) {
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if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n",
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c->ic_freq, c->ic_flags);
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return 0; /* XXX */
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} else {
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if_printf(&ic->ic_if, "invalid channel (NULL)\n");
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return 0; /* XXX */
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}
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}
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/*
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* Convert IEEE channel number to MHz frequency.
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*/
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u_int
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ieee80211_ieee2mhz(u_int chan, u_int flags)
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{
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if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
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if (chan == 14)
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return 2484;
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if (chan < 14)
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return 2407 + chan*5;
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else
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return 2512 + ((chan-15)*20);
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} else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
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return 5000 + (chan*5);
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} else { /* either, guess */
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if (chan == 14)
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return 2484;
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if (chan < 14) /* 0-13 */
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return 2407 + chan*5;
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if (chan < 27) /* 15-26 */
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return 2512 + ((chan-15)*20);
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return 5000 + (chan*5);
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}
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}
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/*
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* Setup the media data structures according to the channel and
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* rate tables. This must be called by the driver after
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* ieee80211_attach and before most anything else.
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*/
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void
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ieee80211_media_init(struct ifnet *ifp,
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ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
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{
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#define ADD(_ic, _s, _o) \
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ifmedia_add(&(_ic)->ic_media, \
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IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
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struct ieee80211com *ic = (void *)ifp;
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struct ifmediareq imr;
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int i, j, mode, rate, maxrate, mword, mopt, r;
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struct ieee80211_rateset *rs;
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struct ieee80211_rateset allrates;
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/*
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* Fill in media characteristics.
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*/
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ifmedia_init(&ic->ic_media, 0, media_change, media_stat);
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maxrate = 0;
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memset(&allrates, 0, sizeof(allrates));
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for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) {
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static const u_int mopts[] = {
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IFM_AUTO,
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IFM_MAKEMODE(IFM_IEEE80211_11A),
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IFM_MAKEMODE(IFM_IEEE80211_11B),
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IFM_MAKEMODE(IFM_IEEE80211_11G),
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IFM_MAKEMODE(IFM_IEEE80211_11A) | IFM_IEEE80211_TURBO,
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};
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if ((ic->ic_modecaps & (1<<mode)) == 0)
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continue;
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mopt = mopts[mode];
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ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */
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if (ic->ic_caps & IEEE80211_C_IBSS)
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ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC);
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if (ic->ic_caps & IEEE80211_C_HOSTAP)
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ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP);
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if (ic->ic_caps & IEEE80211_C_AHDEMO)
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ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
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if (ic->ic_caps & IEEE80211_C_MONITOR)
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ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_MONITOR);
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if (mode == IEEE80211_MODE_AUTO)
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continue;
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if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
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rs = &ic->ic_sup_rates[mode];
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for (i = 0; i < rs->rs_nrates; i++) {
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rate = rs->rs_rates[i];
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mword = ieee80211_rate2media(ic, rate, mode);
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if (mword == 0)
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continue;
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printf("%s%d%sMbps", (i != 0 ? " " : ""),
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(rate & IEEE80211_RATE_VAL) / 2,
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((rate & 0x1) != 0 ? ".5" : ""));
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ADD(ic, mword, mopt);
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if (ic->ic_caps & IEEE80211_C_IBSS)
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ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC);
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if (ic->ic_caps & IEEE80211_C_HOSTAP)
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ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP);
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if (ic->ic_caps & IEEE80211_C_AHDEMO)
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ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
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if (ic->ic_caps & IEEE80211_C_MONITOR)
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ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR);
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/*
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* Add rate to the collection of all rates.
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*/
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r = rate & IEEE80211_RATE_VAL;
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for (j = 0; j < allrates.rs_nrates; j++)
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if (allrates.rs_rates[j] == r)
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break;
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if (j == allrates.rs_nrates) {
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/* unique, add to the set */
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allrates.rs_rates[j] = r;
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allrates.rs_nrates++;
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}
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rate = (rate & IEEE80211_RATE_VAL) / 2;
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if (rate > maxrate)
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maxrate = rate;
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}
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printf("\n");
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}
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for (i = 0; i < allrates.rs_nrates; i++) {
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mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
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IEEE80211_MODE_AUTO);
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if (mword == 0)
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continue;
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mword = IFM_SUBTYPE(mword); /* remove media options */
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ADD(ic, mword, 0);
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if (ic->ic_caps & IEEE80211_C_IBSS)
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ADD(ic, mword, IFM_IEEE80211_ADHOC);
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if (ic->ic_caps & IEEE80211_C_HOSTAP)
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ADD(ic, mword, IFM_IEEE80211_HOSTAP);
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if (ic->ic_caps & IEEE80211_C_AHDEMO)
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ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0);
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if (ic->ic_caps & IEEE80211_C_MONITOR)
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ADD(ic, mword, IFM_IEEE80211_MONITOR);
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}
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ieee80211_media_status(ifp, &imr);
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ifmedia_set(&ic->ic_media, imr.ifm_active);
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if (maxrate)
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ifp->if_baudrate = IF_Mbps(maxrate);
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#undef ADD
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}
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static int
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findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate)
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{
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#define IEEERATE(_ic,_m,_i) \
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((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL)
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int i, nrates = ic->ic_sup_rates[mode].rs_nrates;
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for (i = 0; i < nrates; i++)
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if (IEEERATE(ic, mode, i) == rate)
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return i;
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return -1;
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#undef IEEERATE
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}
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/*
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* Handle a media change request.
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*/
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int
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ieee80211_media_change(struct ifnet *ifp)
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{
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struct ieee80211com *ic = (void *)ifp;
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struct ifmedia_entry *ime;
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enum ieee80211_opmode newopmode;
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enum ieee80211_phymode newphymode;
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int i, j, newrate, error = 0;
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ime = ic->ic_media.ifm_cur;
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/*
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* First, identify the phy mode.
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*/
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switch (IFM_MODE(ime->ifm_media)) {
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case IFM_IEEE80211_11A:
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newphymode = IEEE80211_MODE_11A;
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break;
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case IFM_IEEE80211_11B:
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newphymode = IEEE80211_MODE_11B;
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break;
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case IFM_IEEE80211_11G:
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newphymode = IEEE80211_MODE_11G;
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break;
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case IFM_AUTO:
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newphymode = IEEE80211_MODE_AUTO;
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break;
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default:
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return EINVAL;
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}
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/*
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* Turbo mode is an ``option''. Eventually it
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* needs to be applied to 11g too.
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*/
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if (ime->ifm_media & IFM_IEEE80211_TURBO) {
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if (newphymode != IEEE80211_MODE_11A)
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return EINVAL;
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newphymode = IEEE80211_MODE_TURBO;
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}
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/*
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* Validate requested mode is available.
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*/
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if ((ic->ic_modecaps & (1<<newphymode)) == 0)
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return EINVAL;
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/*
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* Next, the fixed/variable rate.
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*/
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i = -1;
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if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) {
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/*
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* Convert media subtype to rate.
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*/
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newrate = ieee80211_media2rate(ime->ifm_media);
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if (newrate == 0)
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return EINVAL;
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/*
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* Check the rate table for the specified/current phy.
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*/
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if (newphymode == IEEE80211_MODE_AUTO) {
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/*
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* In autoselect mode search for the rate.
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*/
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for (j = IEEE80211_MODE_11A;
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j < IEEE80211_MODE_MAX; j++) {
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if ((ic->ic_modecaps & (1<<j)) == 0)
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continue;
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i = findrate(ic, j, newrate);
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if (i != -1) {
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/* lock mode too */
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newphymode = j;
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break;
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}
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}
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} else {
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i = findrate(ic, newphymode, newrate);
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}
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if (i == -1) /* mode/rate mismatch */
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return EINVAL;
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}
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/* NB: defer rate setting to later */
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/*
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* Deduce new operating mode but don't install it just yet.
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*/
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if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) ==
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(IFM_IEEE80211_ADHOC|IFM_FLAG0))
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newopmode = IEEE80211_M_AHDEMO;
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else if (ime->ifm_media & IFM_IEEE80211_HOSTAP)
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newopmode = IEEE80211_M_HOSTAP;
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else if (ime->ifm_media & IFM_IEEE80211_ADHOC)
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newopmode = IEEE80211_M_IBSS;
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else if (ime->ifm_media & IFM_IEEE80211_MONITOR)
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newopmode = IEEE80211_M_MONITOR;
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else
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newopmode = IEEE80211_M_STA;
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/*
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* Autoselect doesn't make sense when operating as an AP.
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* If no phy mode has been selected, pick one and lock it
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* down so rate tables can be used in forming beacon frames
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* and the like.
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*/
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if (newopmode == IEEE80211_M_HOSTAP &&
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newphymode == IEEE80211_MODE_AUTO) {
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for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++)
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if (ic->ic_modecaps & (1<<j)) {
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newphymode = j;
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break;
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}
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}
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/*
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* Handle phy mode change.
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*/
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if (ic->ic_curmode != newphymode) { /* change phy mode */
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error = ieee80211_setmode(ic, newphymode);
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if (error != 0)
|
|
return error;
|
|
error = ENETRESET;
|
|
}
|
|
|
|
/*
|
|
* Committed to changes, install the rate setting.
|
|
*/
|
|
if (ic->ic_fixed_rate != i) {
|
|
ic->ic_fixed_rate = i; /* set fixed tx rate */
|
|
error = ENETRESET;
|
|
}
|
|
|
|
/*
|
|
* Handle operating mode change.
|
|
*/
|
|
if (ic->ic_opmode != newopmode) {
|
|
ic->ic_opmode = newopmode;
|
|
switch (newopmode) {
|
|
case IEEE80211_M_AHDEMO:
|
|
case IEEE80211_M_HOSTAP:
|
|
case IEEE80211_M_STA:
|
|
case IEEE80211_M_MONITOR:
|
|
ic->ic_flags &= ~IEEE80211_F_IBSSON;
|
|
break;
|
|
case IEEE80211_M_IBSS:
|
|
ic->ic_flags |= IEEE80211_F_IBSSON;
|
|
#ifdef notdef
|
|
if (ic->ic_curmode == IEEE80211_MODE_11G)
|
|
ieee80211_set11gbasicrates(
|
|
&ic->ic_suprates[newphymode],
|
|
IEEE80211_MODE_11B);
|
|
#endif
|
|
break;
|
|
}
|
|
error = ENETRESET;
|
|
}
|
|
#ifdef notdef
|
|
if (error == 0)
|
|
ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media);
|
|
#endif
|
|
return error;
|
|
}
|
|
|
|
void
|
|
ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
|
|
{
|
|
struct ieee80211com *ic = (void *)ifp;
|
|
struct ieee80211_node *ni = NULL;
|
|
|
|
imr->ifm_status = IFM_AVALID;
|
|
imr->ifm_active = IFM_IEEE80211;
|
|
if (ic->ic_state == IEEE80211_S_RUN)
|
|
imr->ifm_status |= IFM_ACTIVE;
|
|
imr->ifm_active |= IFM_AUTO;
|
|
switch (ic->ic_opmode) {
|
|
case IEEE80211_M_STA:
|
|
ni = ic->ic_bss;
|
|
/* calculate rate subtype */
|
|
imr->ifm_active |= ieee80211_rate2media(ic,
|
|
ni->ni_rates.rs_rates[ni->ni_txrate], ic->ic_curmode);
|
|
break;
|
|
case IEEE80211_M_IBSS:
|
|
imr->ifm_active |= IFM_IEEE80211_ADHOC;
|
|
break;
|
|
case IEEE80211_M_AHDEMO:
|
|
/* should not come here */
|
|
break;
|
|
case IEEE80211_M_HOSTAP:
|
|
imr->ifm_active |= IFM_IEEE80211_HOSTAP;
|
|
break;
|
|
case IEEE80211_M_MONITOR:
|
|
imr->ifm_active |= IFM_IEEE80211_MONITOR;
|
|
break;
|
|
}
|
|
switch (ic->ic_curmode) {
|
|
case IEEE80211_MODE_11A:
|
|
imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A);
|
|
break;
|
|
case IEEE80211_MODE_11B:
|
|
imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11B);
|
|
break;
|
|
case IEEE80211_MODE_11G:
|
|
imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11G);
|
|
break;
|
|
case IEEE80211_MODE_TURBO:
|
|
imr->ifm_active |= IFM_MAKEMODE(IFM_IEEE80211_11A)
|
|
| IFM_IEEE80211_TURBO;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
ieee80211_watchdog(struct ifnet *ifp)
|
|
{
|
|
struct ieee80211com *ic = (void *)ifp;
|
|
|
|
if (ic->ic_mgt_timer && --ic->ic_mgt_timer == 0)
|
|
ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
|
|
if (ic->ic_inact_timer && --ic->ic_inact_timer == 0)
|
|
ieee80211_timeout_nodes(ic);
|
|
|
|
if (ic->ic_mgt_timer != 0 || ic->ic_inact_timer != 0)
|
|
ifp->if_timer = 1;
|
|
}
|
|
|
|
/*
|
|
* Mark the basic rates for the 11g rate table based on the
|
|
* operating mode. For real 11g we mark all the 11b rates
|
|
* and 6, 12, and 24 OFDM. For 11b compatibility we mark only
|
|
* 11b rates. There's also a pseudo 11a-mode used to mark only
|
|
* the basic OFDM rates.
|
|
*/
|
|
static void
|
|
ieee80211_set11gbasicrates(struct ieee80211_rateset *rs, enum ieee80211_phymode mode)
|
|
{
|
|
static const struct ieee80211_rateset basic[] = {
|
|
{ 3, { 12, 24, 48 } }, /* IEEE80211_MODE_11A */
|
|
{ 4, { 2, 4, 11, 22 } }, /* IEEE80211_MODE_11B */
|
|
{ 7, { 2, 4, 11, 22, 12, 24, 48 } },/* IEEE80211_MODE_11G */
|
|
{ 0 }, /* IEEE80211_MODE_TURBO */
|
|
};
|
|
int i, j;
|
|
|
|
for (i = 0; i < rs->rs_nrates; i++) {
|
|
rs->rs_rates[i] &= IEEE80211_RATE_VAL;
|
|
for (j = 0; j < basic[mode].rs_nrates; j++)
|
|
if (basic[mode].rs_rates[j] == rs->rs_rates[i]) {
|
|
rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set the current phy mode and recalculate the active channel
|
|
* set based on the available channels for this mode. Also
|
|
* select a new default/current channel if the current one is
|
|
* inappropriate for this mode.
|
|
*/
|
|
int
|
|
ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
|
|
{
|
|
#define N(a) (sizeof(a) / sizeof(a[0]))
|
|
static const u_int chanflags[] = {
|
|
0, /* IEEE80211_MODE_AUTO */
|
|
IEEE80211_CHAN_A, /* IEEE80211_MODE_11A */
|
|
IEEE80211_CHAN_B, /* IEEE80211_MODE_11B */
|
|
IEEE80211_CHAN_PUREG, /* IEEE80211_MODE_11G */
|
|
IEEE80211_CHAN_T, /* IEEE80211_MODE_TURBO */
|
|
};
|
|
struct ieee80211_channel *c;
|
|
u_int modeflags;
|
|
int i;
|
|
|
|
/* validate new mode */
|
|
if ((ic->ic_modecaps & (1<<mode)) == 0) {
|
|
IEEE80211_DPRINTF(("%s: mode %u not supported (caps 0x%x)\n",
|
|
__func__, mode, ic->ic_modecaps));
|
|
return EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Verify at least one channel is present in the available
|
|
* channel list before committing to the new mode.
|
|
*/
|
|
KASSERT(mode < N(chanflags), ("Unexpected mode %u\n", mode));
|
|
modeflags = chanflags[mode];
|
|
for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
|
|
c = &ic->ic_channels[i];
|
|
if (mode == IEEE80211_MODE_AUTO) {
|
|
/* ignore turbo channels for autoselect */
|
|
if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
|
|
break;
|
|
} else {
|
|
if ((c->ic_flags & modeflags) == modeflags)
|
|
break;
|
|
}
|
|
}
|
|
if (i > IEEE80211_CHAN_MAX) {
|
|
IEEE80211_DPRINTF(("%s: no channels found for mode %u\n",
|
|
__func__, mode));
|
|
return EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Calculate the active channel set.
|
|
*/
|
|
memset(ic->ic_chan_active, 0, sizeof(ic->ic_chan_active));
|
|
for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
|
|
c = &ic->ic_channels[i];
|
|
if (mode == IEEE80211_MODE_AUTO) {
|
|
/* take anything but pure turbo channels */
|
|
if ((c->ic_flags &~ IEEE80211_CHAN_TURBO) != 0)
|
|
setbit(ic->ic_chan_active, i);
|
|
} else {
|
|
if ((c->ic_flags & modeflags) == modeflags)
|
|
setbit(ic->ic_chan_active, i);
|
|
}
|
|
}
|
|
/*
|
|
* If no current/default channel is setup or the current
|
|
* channel is wrong for the mode then pick the first
|
|
* available channel from the active list. This is likely
|
|
* not the right one.
|
|
*/
|
|
if (ic->ic_ibss_chan == NULL ||
|
|
isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
|
|
for (i = 0; i <= IEEE80211_CHAN_MAX; i++)
|
|
if (isset(ic->ic_chan_active, i)) {
|
|
ic->ic_ibss_chan = &ic->ic_channels[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set/reset state flags that influence beacon contents, etc.
|
|
*
|
|
* XXX what if we have stations already associated???
|
|
* XXX probably not right for autoselect?
|
|
*/
|
|
if (mode == IEEE80211_MODE_11G) {
|
|
if (ic->ic_caps & IEEE80211_C_SHSLOT)
|
|
ic->ic_flags |= IEEE80211_F_SHSLOT;
|
|
if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
|
|
ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
|
|
ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode],
|
|
IEEE80211_MODE_11G);
|
|
} else {
|
|
ic->ic_flags &= ~(IEEE80211_F_SHSLOT | IEEE80211_F_SHPREAMBLE);
|
|
}
|
|
|
|
ic->ic_curmode = mode;
|
|
return 0;
|
|
#undef N
|
|
}
|
|
|
|
/*
|
|
* Return the phy mode for with the specified channel so the
|
|
* caller can select a rate set. This is problematic and the
|
|
* work here assumes how things work elsewhere in this code.
|
|
*/
|
|
enum ieee80211_phymode
|
|
ieee80211_chan2mode(struct ieee80211com *ic, struct ieee80211_channel *chan)
|
|
{
|
|
/*
|
|
* NB: this assumes the channel would not be supplied to us
|
|
* unless it was already compatible with the current mode.
|
|
*/
|
|
if (ic->ic_curmode != IEEE80211_MODE_AUTO)
|
|
return ic->ic_curmode;
|
|
/*
|
|
* In autoselect mode; deduce a mode based on the channel
|
|
* characteristics. We assume that turbo-only channels
|
|
* are not considered when the channel set is constructed.
|
|
*/
|
|
if (IEEE80211_IS_CHAN_5GHZ(chan))
|
|
return IEEE80211_MODE_11A;
|
|
else if (chan->ic_flags & (IEEE80211_CHAN_OFDM|IEEE80211_CHAN_DYN))
|
|
return IEEE80211_MODE_11G;
|
|
else
|
|
return IEEE80211_MODE_11B;
|
|
}
|
|
|
|
/*
|
|
* convert IEEE80211 rate value to ifmedia subtype.
|
|
* ieee80211 rate is in unit of 0.5Mbps.
|
|
*/
|
|
int
|
|
ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
|
|
{
|
|
#define N(a) (sizeof(a) / sizeof(a[0]))
|
|
static const struct {
|
|
u_int m; /* rate + mode */
|
|
u_int r; /* if_media rate */
|
|
} rates[] = {
|
|
{ 2 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS1 },
|
|
{ 4 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS2 },
|
|
{ 11 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS5 },
|
|
{ 22 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS11 },
|
|
{ 44 | IFM_MAKEMODE(IFM_IEEE80211_11B), IFM_IEEE80211_DS22 },
|
|
{ 12 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM6 },
|
|
{ 18 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM9 },
|
|
{ 24 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM12 },
|
|
{ 36 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM18 },
|
|
{ 48 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM24 },
|
|
{ 72 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM36 },
|
|
{ 96 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM48 },
|
|
{ 108 | IFM_MAKEMODE(IFM_IEEE80211_11A), IFM_IEEE80211_OFDM54 },
|
|
{ 2 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS1 },
|
|
{ 4 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS2 },
|
|
{ 11 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS5 },
|
|
{ 22 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_DS11 },
|
|
{ 12 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM6 },
|
|
{ 18 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM9 },
|
|
{ 24 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM12 },
|
|
{ 36 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM18 },
|
|
{ 48 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM24 },
|
|
{ 72 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM36 },
|
|
{ 96 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM48 },
|
|
{ 108 | IFM_MAKEMODE(IFM_IEEE80211_11G), IFM_IEEE80211_OFDM54 },
|
|
/* NB: OFDM72 doesn't realy exist so we don't handle it */
|
|
};
|
|
u_int mask, i;
|
|
|
|
mask = rate & IEEE80211_RATE_VAL;
|
|
switch (mode) {
|
|
case IEEE80211_MODE_11A:
|
|
case IEEE80211_MODE_TURBO:
|
|
mask |= IFM_MAKEMODE(IFM_IEEE80211_11A);
|
|
break;
|
|
case IEEE80211_MODE_11B:
|
|
mask |= IFM_MAKEMODE(IFM_IEEE80211_11B);
|
|
break;
|
|
case IEEE80211_MODE_AUTO:
|
|
/* NB: ic may be NULL for some drivers */
|
|
if (ic && ic->ic_phytype == IEEE80211_T_FH) {
|
|
/* must handle these specially */
|
|
switch (mask) {
|
|
case 2: return IFM_IEEE80211_FH1;
|
|
case 4: return IFM_IEEE80211_FH2;
|
|
}
|
|
return IFM_AUTO;
|
|
}
|
|
/* NB: hack, 11g matches both 11b+11a rates */
|
|
/* fall thru... */
|
|
case IEEE80211_MODE_11G:
|
|
mask |= IFM_MAKEMODE(IFM_IEEE80211_11G);
|
|
break;
|
|
}
|
|
for (i = 0; i < N(rates); i++)
|
|
if (rates[i].m == mask)
|
|
return rates[i].r;
|
|
return IFM_AUTO;
|
|
#undef N
|
|
}
|
|
|
|
int
|
|
ieee80211_media2rate(int mword)
|
|
{
|
|
#define N(a) (sizeof(a) / sizeof(a[0]))
|
|
static const int ieeerates[] = {
|
|
-1, /* IFM_AUTO */
|
|
0, /* IFM_MANUAL */
|
|
0, /* IFM_NONE */
|
|
2, /* IFM_IEEE80211_FH1 */
|
|
4, /* IFM_IEEE80211_FH2 */
|
|
2, /* IFM_IEEE80211_DS1 */
|
|
4, /* IFM_IEEE80211_DS2 */
|
|
11, /* IFM_IEEE80211_DS5 */
|
|
22, /* IFM_IEEE80211_DS11 */
|
|
44, /* IFM_IEEE80211_DS22 */
|
|
12, /* IFM_IEEE80211_OFDM6 */
|
|
18, /* IFM_IEEE80211_OFDM9 */
|
|
24, /* IFM_IEEE80211_OFDM12 */
|
|
36, /* IFM_IEEE80211_OFDM18 */
|
|
48, /* IFM_IEEE80211_OFDM24 */
|
|
72, /* IFM_IEEE80211_OFDM36 */
|
|
96, /* IFM_IEEE80211_OFDM48 */
|
|
108, /* IFM_IEEE80211_OFDM54 */
|
|
144, /* IFM_IEEE80211_OFDM72 */
|
|
};
|
|
return IFM_SUBTYPE(mword) < N(ieeerates) ?
|
|
ieeerates[IFM_SUBTYPE(mword)] : 0;
|
|
#undef N
|
|
}
|
|
|
|
/*
|
|
* Module glue.
|
|
*
|
|
* NB: the module name is "wlan" for compatibility with NetBSD.
|
|
*/
|
|
|
|
static int
|
|
ieee80211_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
if (bootverbose)
|
|
printf("wlan: <802.11 Link Layer>\n");
|
|
return 0;
|
|
case MOD_UNLOAD:
|
|
return 0;
|
|
}
|
|
return EINVAL;
|
|
}
|
|
|
|
static moduledata_t ieee80211_mod = {
|
|
"wlan",
|
|
ieee80211_modevent,
|
|
0
|
|
};
|
|
DECLARE_MODULE(wlan, ieee80211_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
|
|
MODULE_VERSION(wlan, 1);
|
|
MODULE_DEPEND(wlan, rc4, 1, 1, 1);
|