diff options
Diffstat (limited to 'sys/net80211/ieee80211.c')
-rw-r--r-- | sys/net80211/ieee80211.c | 858 |
1 files changed, 858 insertions, 0 deletions
diff --git a/sys/net80211/ieee80211.c b/sys/net80211/ieee80211.c new file mode 100644 index 0000000..4cec8d1 --- /dev/null +++ b/sys/net80211/ieee80211.c @@ -0,0 +1,858 @@ +/*- + * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any + * redistribution must be conditioned upon including a substantially + * similar Disclaimer requirement for further binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * 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 NONINFRINGEMENT, MERCHANTIBILITY + * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/* + * IEEE 802.11 generic handler + */ + +#include "opt_inet.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <sys/malloc.h> +#include <sys/kernel.h> +#include <sys/socket.h> +#include <sys/sockio.h> +#include <sys/endian.h> +#include <sys/errno.h> +#include <sys/bus.h> +#include <sys/proc.h> +#include <sys/sysctl.h> + +#include <machine/atomic.h> + +#include <net/if.h> +#include <net/if_dl.h> +#include <net/if_media.h> +#include <net/if_arp.h> +#include <net/ethernet.h> +#include <net/if_llc.h> + +#include <net80211/ieee80211_var.h> + +#include <net/bpf.h> + +#ifdef INET +#include <netinet/in.h> +#include <netinet/if_ether.h> +#endif + +#ifdef IEEE80211_DEBUG +int ieee80211_debug = 0; +SYSCTL_INT(_debug, OID_AUTO, ieee80211, CTLFLAG_RW, &ieee80211_debug, + 0, "IEEE 802.11 media debugging printfs"); +#endif + +static void ieee80211_set11gbasicrates(struct ieee80211_rateset *, + enum ieee80211_phymode); + +static const char *ieee80211_phymode_name[] = { + "auto", /* IEEE80211_MODE_AUTO */ + "11a", /* IEEE80211_MODE_11A */ + "11b", /* IEEE80211_MODE_11B */ + "11g", /* IEEE80211_MODE_11G */ + "turbo", /* IEEE80211_MODE_TURBO */ +}; + +void +ieee80211_ifattach(struct ifnet *ifp) +{ + struct ieee80211com *ic = (void *)ifp; + struct ieee80211_channel *c; + int i; + + ether_ifattach(ifp, ic->ic_myaddr); + bpfattach2(ifp, DLT_IEEE802_11, + sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); + ieee80211_crypto_attach(ifp); + + /* + * Fill in 802.11 available channel set, mark + * all available channels as active, and pick + * a default channel if not already specified. + */ + memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); + ic->ic_modecaps |= 1<<IEEE80211_MODE_AUTO; + for (i = 0; i <= IEEE80211_CHAN_MAX; i++) { + c = &ic->ic_channels[i]; + if (c->ic_flags) { + /* + * Verify driver passed us valid data. + */ + if (i != ieee80211_chan2ieee(ic, c)) { + if_printf(ifp, "bad channel ignored; " + "freq %u flags %x number %u\n", + c->ic_freq, c->ic_flags, i); + c->ic_flags = 0; /* NB: remove */ + continue; + } + setbit(ic->ic_chan_avail, i); + /* + * Identify mode capabilities. + */ + if (IEEE80211_IS_CHAN_A(c)) + ic->ic_modecaps |= 1<<IEEE80211_MODE_11A; + if (IEEE80211_IS_CHAN_B(c)) + ic->ic_modecaps |= 1<<IEEE80211_MODE_11B; + if (IEEE80211_IS_CHAN_PUREG(c)) + ic->ic_modecaps |= 1<<IEEE80211_MODE_11G; + if (IEEE80211_IS_CHAN_T(c)) + ic->ic_modecaps |= 1<<IEEE80211_MODE_TURBO; + } + } + /* validate ic->ic_curmode */ + if ((ic->ic_modecaps & (1<<ic->ic_curmode)) == 0) + ic->ic_curmode = IEEE80211_MODE_AUTO; + + (void) ieee80211_setmode(ic, ic->ic_curmode); + + ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ + if (ic->ic_lintval == 0) + ic->ic_lintval = 100; /* default sleep */ + ic->ic_bmisstimeout = 7*ic->ic_lintval; /* default 7 beacons */ + + ieee80211_node_attach(ifp); + ieee80211_proto_attach(ifp); +} + +void +ieee80211_ifdetach(struct ifnet *ifp) +{ + struct ieee80211com *ic = (void *)ifp; + + ieee80211_proto_detach(ifp); + ieee80211_crypto_detach(ifp); + ieee80211_node_detach(ifp); + ifmedia_removeall(&ic->ic_media); + bpfdetach(ifp); + ether_ifdetach(ifp); +} + +/* + * Convert MHz frequency to IEEE channel number. + */ +u_int +ieee80211_mhz2ieee(u_int freq, u_int flags) +{ + if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ + if (freq == 2484) + return 14; + if (freq < 2484) + return (freq - 2407) / 5; + else + return 15 + ((freq - 2512) / 20); + } else if (IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ + return (freq - 5000) / 5; + } else { /* either, guess */ + if (freq == 2484) + return 14; + if (freq < 2484) + return (freq - 2407) / 5; + if (freq < 5000) + return 15 + ((freq - 2512) / 20); + return (freq - 5000) / 5; + } +} + +/* + * Convert channel to IEEE channel number. + */ +u_int +ieee80211_chan2ieee(struct ieee80211com *ic, struct ieee80211_channel *c) +{ + if (ic->ic_channels <= c && c <= &ic->ic_channels[IEEE80211_CHAN_MAX]) + return c - ic->ic_channels; + else if (c == IEEE80211_CHAN_ANYC) + return IEEE80211_CHAN_ANY; + else { + if_printf(&ic->ic_if, "invalid channel freq %u flags %x\n", + c->ic_freq, c->ic_flags); + return 0; /* XXX */ + } +} + +/* + * Convert IEEE channel number to MHz frequency. + */ +u_int +ieee80211_ieee2mhz(u_int chan, u_int flags) +{ + if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ + if (chan == 14) + return 2484; + if (chan < 14) + return 2407 + chan*5; + else + return 2512 + ((chan-15)*20); + } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */ + return 5000 + (chan*5); + } else { /* either, guess */ + if (chan == 14) + return 2484; + if (chan < 14) /* 0-13 */ + return 2407 + chan*5; + if (chan < 27) /* 15-26 */ + return 2512 + ((chan-15)*20); + return 5000 + (chan*5); + } +} + +/* + * Setup the media data structures according to the channel and + * rate tables. This must be called by the driver after + * ieee80211_attach and before most anything else. + */ +void +ieee80211_media_init(struct ifnet *ifp, + ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) +{ +#define ADD(_ic, _s, _o) \ + ifmedia_add(&(_ic)->ic_media, \ + IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) + struct ieee80211com *ic = (void *)ifp; + struct ifmediareq imr; + int i, j, mode, rate, maxrate, mword, mopt, r; + struct ieee80211_rateset *rs; + struct ieee80211_rateset allrates; + + /* + * Fill in media characteristics. + */ + ifmedia_init(&ic->ic_media, 0, media_change, media_stat); + maxrate = 0; + memset(&allrates, 0, sizeof(allrates)); + for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_MAX; mode++) { + static const u_int mopts[] = { + IFM_AUTO, + IFM_MAKEMODE(IFM_IEEE80211_11A), + IFM_MAKEMODE(IFM_IEEE80211_11B), + IFM_MAKEMODE(IFM_IEEE80211_11G), + IFM_MAKEMODE(IFM_IEEE80211_11A) | IFM_IEEE80211_TURBO, + }; + if ((ic->ic_modecaps & (1<<mode)) == 0) + continue; + mopt = mopts[mode]; + ADD(ic, IFM_AUTO, mopt); /* e.g. 11a auto */ + if (ic->ic_caps & IEEE80211_C_IBSS) + ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC); + if (ic->ic_caps & IEEE80211_C_HOSTAP) + ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_HOSTAP); + if (ic->ic_caps & IEEE80211_C_AHDEMO) + ADD(ic, IFM_AUTO, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); + if (mode == IEEE80211_MODE_AUTO) + continue; + if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); + rs = &ic->ic_sup_rates[mode]; + for (i = 0; i < rs->rs_nrates; i++) { + rate = rs->rs_rates[i]; + mword = ieee80211_rate2media(ic, rate, mode); + if (mword == 0) + continue; + printf("%s%d%sMbps", (i != 0 ? " " : ""), + (rate & IEEE80211_RATE_VAL) / 2, + ((rate & 0x1) != 0 ? ".5" : "")); + ADD(ic, mword, mopt); + if (ic->ic_caps & IEEE80211_C_IBSS) + ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC); + if (ic->ic_caps & IEEE80211_C_HOSTAP) + ADD(ic, mword, mopt | IFM_IEEE80211_HOSTAP); + if (ic->ic_caps & IEEE80211_C_AHDEMO) + ADD(ic, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0); + /* + * Add rate to the collection of all rates. + */ + r = rate & IEEE80211_RATE_VAL; + for (j = 0; j < allrates.rs_nrates; j++) + if (allrates.rs_rates[j] == r) + break; + if (j == allrates.rs_nrates) { + /* unique, add to the set */ + allrates.rs_rates[j] = r; + allrates.rs_nrates++; + } + rate = (rate & IEEE80211_RATE_VAL) / 2; + if (rate > maxrate) + maxrate = rate; + } + printf("\n"); + } + for (i = 0; i < allrates.rs_nrates; i++) { + mword = ieee80211_rate2media(ic, allrates.rs_rates[i], + IEEE80211_MODE_AUTO); + if (mword == 0) + continue; + mword = IFM_SUBTYPE(mword); /* remove media options */ + ADD(ic, mword, 0); + if (ic->ic_caps & IEEE80211_C_IBSS) + ADD(ic, mword, IFM_IEEE80211_ADHOC); + if (ic->ic_caps & IEEE80211_C_HOSTAP) + ADD(ic, mword, IFM_IEEE80211_HOSTAP); + if (ic->ic_caps & IEEE80211_C_AHDEMO) + ADD(ic, mword, IFM_IEEE80211_ADHOC | IFM_FLAG0); + } + ieee80211_media_status(ifp, &imr); + ifmedia_set(&ic->ic_media, imr.ifm_active); + + if (maxrate) + ifp->if_baudrate = IF_Mbps(maxrate); +#undef ADD +} + +static int +findrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) +{ +#define IEEERATE(_ic,_m,_i) \ + ((_ic)->ic_sup_rates[_m].rs_rates[_i] & IEEE80211_RATE_VAL) + int i, nrates = ic->ic_sup_rates[mode].rs_nrates; + for (i = 0; i < nrates; i++) + if (IEEERATE(ic, mode, i) == rate) + return i; + return -1; +#undef IEEERATE +} + +/* + * Handle a media change request. + */ +int +ieee80211_media_change(struct ifnet *ifp) +{ + struct ieee80211com *ic = (void *)ifp; + struct ifmedia_entry *ime; + enum ieee80211_opmode newopmode; + enum ieee80211_phymode newphymode; + int i, j, newrate, error = 0; + + ime = ic->ic_media.ifm_cur; + /* + * First, identify the phy mode. + */ + switch (IFM_MODE(ime->ifm_media)) { + case IFM_IEEE80211_11A: + newphymode = IEEE80211_MODE_11A; + break; + case IFM_IEEE80211_11B: + newphymode = IEEE80211_MODE_11B; + break; + case IFM_IEEE80211_11G: + newphymode = IEEE80211_MODE_11G; + break; + case IFM_AUTO: + newphymode = IEEE80211_MODE_AUTO; + break; + default: + return EINVAL; + } + /* + * Turbo mode is an ``option''. Eventually it + * needs to be applied to 11g too. + */ + if (ime->ifm_media & IFM_IEEE80211_TURBO) { + if (newphymode != IEEE80211_MODE_11A) + return EINVAL; + newphymode = IEEE80211_MODE_TURBO; + } + /* + * Validate requested mode is available. + */ + if ((ic->ic_modecaps & (1<<newphymode)) == 0) + return EINVAL; + + /* + * Next, the fixed/variable rate. + */ + i = -1; + if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { + /* + * Convert media subtype to rate. + */ + newrate = ieee80211_media2rate(ime->ifm_media); + if (newrate == 0) + return EINVAL; + /* + * Check the rate table for the specified/current phy. + */ + if (newphymode == IEEE80211_MODE_AUTO) { + /* + * In autoselect mode search for the rate. + */ + for (j = IEEE80211_MODE_11A; + j < IEEE80211_MODE_MAX; j++) { + if ((ic->ic_modecaps & (1<<j)) == 0) + continue; + i = findrate(ic, j, newrate); + if (i != -1) { + /* lock mode too */ + newphymode = j; + break; + } + } + } else { + i = findrate(ic, newphymode, newrate); + } + if (i == -1) /* mode/rate mismatch */ + return EINVAL; + } + /* NB: defer rate setting to later */ + + /* + * Deduce new operating mode but don't install it just yet. + */ + if ((ime->ifm_media & (IFM_IEEE80211_ADHOC|IFM_FLAG0)) == + (IFM_IEEE80211_ADHOC|IFM_FLAG0)) + newopmode = IEEE80211_M_AHDEMO; + else if (ime->ifm_media & IFM_IEEE80211_HOSTAP) + newopmode = IEEE80211_M_HOSTAP; + else if (ime->ifm_media & IFM_IEEE80211_ADHOC) + newopmode = IEEE80211_M_IBSS; + else + newopmode = IEEE80211_M_STA; + + /* + * Autoselect doesn't make sense when operating as an AP. + * If no phy mode has been selected, pick one and lock it + * down so rate tables can be used in forming beacon frames + * and the like. + */ + if (newopmode == IEEE80211_M_HOSTAP && + newphymode == IEEE80211_MODE_AUTO) { + for (j = IEEE80211_MODE_11A; j < IEEE80211_MODE_MAX; j++) + if (ic->ic_modecaps & (1<<j)) { + newphymode = j; + break; + } + } + + /* + * Handle phy mode change. + */ + if (ic->ic_curmode != newphymode) { /* change phy mode */ + error = ieee80211_setmode(ic, newphymode); + 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: + 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; + } + 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(ifp, 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); |