/*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002-2007 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. * 2. 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 AUTHOR ``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 AUTHOR 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. */ #include __FBSDID("$FreeBSD: head/sys/net80211/ieee80211.c 173861 2007-11-23 05:57:20Z sam $"); /* * IEEE 802.11 generic handler */ #include #include #include #include #include #include #include #include #include const char *ieee80211_phymode_name[] = { "auto", /* IEEE80211_MODE_AUTO */ "11a", /* IEEE80211_MODE_11A */ "11b", /* IEEE80211_MODE_11B */ "11g", /* IEEE80211_MODE_11G */ "FH", /* IEEE80211_MODE_FH */ "turboA", /* IEEE80211_MODE_TURBO_A */ "turboG", /* IEEE80211_MODE_TURBO_G */ "sturboA", /* IEEE80211_MODE_STURBO_A */ "11na", /* IEEE80211_MODE_11NA */ "11ng", /* IEEE80211_MODE_11NG */ }; /* * Default supported rates for 802.11 operation (in IEEE .5Mb units). */ #define B(r) ((r) | IEEE80211_RATE_BASIC) static const struct ieee80211_rateset ieee80211_rateset_11a = { 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } }; static const struct ieee80211_rateset ieee80211_rateset_half = { 8, { B(6), 9, B(12), 18, B(24), 36, 48, 54 } }; static const struct ieee80211_rateset ieee80211_rateset_quarter = { 8, { B(3), 4, B(6), 9, B(12), 18, 24, 27 } }; static const struct ieee80211_rateset ieee80211_rateset_11b = { 4, { B(2), B(4), B(11), B(22) } }; /* NB: OFDM rates are handled specially based on mode */ static const struct ieee80211_rateset ieee80211_rateset_11g = { 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } }; #undef B static int media_status(enum ieee80211_opmode , const struct ieee80211_channel *); /* list of all instances */ SLIST_HEAD(ieee80211_list, ieee80211com); static struct ieee80211_list ieee80211_list = SLIST_HEAD_INITIALIZER(ieee80211_list); static uint8_t ieee80211_vapmap[32]; /* enough for 256 */ static struct mtx ieee80211_vap_mtx; MTX_SYSINIT(ieee80211, &ieee80211_vap_mtx, "net80211 instances", MTX_DEF); static void ieee80211_add_vap(struct ieee80211com *ic) { #define N(a) (sizeof(a)/sizeof(a[0])) int i; uint8_t b; mtx_lock(&ieee80211_vap_mtx); ic->ic_vap = 0; for (i = 0; i < N(ieee80211_vapmap) && ieee80211_vapmap[i] == 0xff; i++) ic->ic_vap += NBBY; if (i == N(ieee80211_vapmap)) panic("vap table full"); for (b = ieee80211_vapmap[i]; b & 1; b >>= 1) ic->ic_vap++; setbit(ieee80211_vapmap, ic->ic_vap); SLIST_INSERT_HEAD(&ieee80211_list, ic, ic_next); mtx_unlock(&ieee80211_vap_mtx); #undef N } static void ieee80211_remove_vap(struct ieee80211com *ic) { mtx_lock(&ieee80211_vap_mtx); SLIST_REMOVE(&ieee80211_list, ic, ieee80211com, ic_next); KASSERT(ic->ic_vap < sizeof(ieee80211_vapmap)*NBBY, ("invalid vap id %d", ic->ic_vap)); KASSERT(isset(ieee80211_vapmap, ic->ic_vap), ("vap id %d not allocated", ic->ic_vap)); clrbit(ieee80211_vapmap, ic->ic_vap); mtx_unlock(&ieee80211_vap_mtx); } /* * Default reset method for use with the ioctl support. This * method is invoked after any state change in the 802.11 * layer that should be propagated to the hardware but not * require re-initialization of the 802.11 state machine (e.g * rescanning for an ap). We always return ENETRESET which * should cause the driver to re-initialize the device. Drivers * can override this method to implement more optimized support. */ static int ieee80211_default_reset(struct ifnet *ifp) { return ENETRESET; } /* * Fill in 802.11 available channel set, mark * all available channels as active, and pick * a default channel if not already specified. */ static void ieee80211_chan_init(struct ieee80211com *ic) { #define DEFAULTRATES(m, def) do { \ if (isset(ic->ic_modecaps, m) && ic->ic_sup_rates[m].rs_nrates == 0) \ ic->ic_sup_rates[m] = def; \ } while (0) struct ieee80211_channel *c; int i; KASSERT(0 < ic->ic_nchans && ic->ic_nchans < IEEE80211_CHAN_MAX, ("invalid number of channels specified: %u", ic->ic_nchans)); memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail)); setbit(ic->ic_modecaps, IEEE80211_MODE_AUTO); for (i = 0; i < ic->ic_nchans; i++) { c = &ic->ic_channels[i]; KASSERT(c->ic_flags != 0, ("channel with no flags")); KASSERT(c->ic_ieee < IEEE80211_CHAN_MAX, ("channel with bogus ieee number %u", c->ic_ieee)); setbit(ic->ic_chan_avail, c->ic_ieee); /* * Identify mode capabilities. */ if (IEEE80211_IS_CHAN_A(c)) setbit(ic->ic_modecaps, IEEE80211_MODE_11A); if (IEEE80211_IS_CHAN_B(c)) setbit(ic->ic_modecaps, IEEE80211_MODE_11B); if (IEEE80211_IS_CHAN_ANYG(c)) setbit(ic->ic_modecaps, IEEE80211_MODE_11G); if (IEEE80211_IS_CHAN_FHSS(c)) setbit(ic->ic_modecaps, IEEE80211_MODE_FH); if (IEEE80211_IS_CHAN_108A(c)) setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_A); if (IEEE80211_IS_CHAN_108G(c)) setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_G); if (IEEE80211_IS_CHAN_ST(c)) setbit(ic->ic_modecaps, IEEE80211_MODE_STURBO_A); if (IEEE80211_IS_CHAN_HTA(c)) setbit(ic->ic_modecaps, IEEE80211_MODE_11NA); if (IEEE80211_IS_CHAN_HTG(c)) setbit(ic->ic_modecaps, IEEE80211_MODE_11NG); } /* initialize candidate channels to all available */ memcpy(ic->ic_chan_active, ic->ic_chan_avail, sizeof(ic->ic_chan_avail)); ic->ic_des_chan = IEEE80211_CHAN_ANYC; /* any channel is ok */ ic->ic_bsschan = IEEE80211_CHAN_ANYC; ic->ic_prevchan = NULL; /* arbitrarily pick the first channel */ ic->ic_curchan = &ic->ic_channels[0]; /* fillin well-known rate sets if driver has not specified */ DEFAULTRATES(IEEE80211_MODE_11B, ieee80211_rateset_11b); DEFAULTRATES(IEEE80211_MODE_11G, ieee80211_rateset_11g); DEFAULTRATES(IEEE80211_MODE_11A, ieee80211_rateset_11a); DEFAULTRATES(IEEE80211_MODE_TURBO_A, ieee80211_rateset_11a); DEFAULTRATES(IEEE80211_MODE_TURBO_G, ieee80211_rateset_11g); /* * Set auto mode to reset active channel state and any desired channel. */ (void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO); #undef DEFAULTRATES } void ieee80211_ifattach(struct ieee80211com *ic) { struct ifnet *ifp = ic->ic_ifp; ether_ifattach(ifp, ic->ic_myaddr); ifp->if_output = ieee80211_output; bpfattach2(ifp, DLT_IEEE802_11, sizeof(struct ieee80211_frame_addr4), &ic->ic_rawbpf); /* override the 802.3 setting */ ifp->if_hdrlen = ic->ic_headroom + sizeof(struct ieee80211_qosframe_addr4) + IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN + IEEE80211_WEP_EXTIVLEN; /* XXX no way to recalculate on ifdetach */ if (ALIGN(ifp->if_hdrlen) > max_linkhdr) { /* XXX sanity check... */ max_linkhdr = ALIGN(ifp->if_hdrlen); max_hdr = max_linkhdr + max_protohdr; max_datalen = MHLEN - max_hdr; } /* * Fill in 802.11 available channel set, mark all * available channels as active, and pick a default * channel if not already specified. */ ieee80211_chan_init(ic); if (ic->ic_caps & IEEE80211_C_BGSCAN) /* enable if capable */ ic->ic_flags |= IEEE80211_F_BGSCAN; #if 0 /* XXX not until WME+WPA issues resolved */ if (ic->ic_caps & IEEE80211_C_WME) /* enable if capable */ ic->ic_flags |= IEEE80211_F_WME; #endif if (ic->ic_caps & IEEE80211_C_BURST) ic->ic_flags |= IEEE80211_F_BURST; ic->ic_flags |= IEEE80211_F_DOTH; /* XXX out of caps, just ena */ ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT; ic->ic_bmissthreshold = IEEE80211_HWBMISS_DEFAULT; ic->ic_dtim_period = IEEE80211_DTIM_DEFAULT; IEEE80211_LOCK_INIT(ic, "ieee80211com"); IEEE80211_BEACON_LOCK_INIT(ic, "beacon"); ic->ic_lintval = ic->ic_bintval; ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX; ieee80211_crypto_attach(ic); ieee80211_node_attach(ic); ieee80211_power_attach(ic); ieee80211_proto_attach(ic); ieee80211_ht_attach(ic); ieee80211_scan_attach(ic); ieee80211_add_vap(ic); ieee80211_sysctl_attach(ic); /* NB: requires ic_vap */ /* * Install a default reset method for the ioctl support. * The driver is expected to fill this in before calling us. */ if (ic->ic_reset == NULL) ic->ic_reset = ieee80211_default_reset; KASSERT(ifp->if_spare2 == NULL, ("oops, hosed")); ifp->if_spare2 = ic; /* XXX temp backpointer */ } void ieee80211_ifdetach(struct ieee80211com *ic) { struct ifnet *ifp = ic->ic_ifp; ieee80211_remove_vap(ic); ieee80211_sysctl_detach(ic); ieee80211_scan_detach(ic); ieee80211_ht_detach(ic); /* NB: must be called before ieee80211_node_detach */ ieee80211_proto_detach(ic); ieee80211_crypto_detach(ic); ieee80211_power_detach(ic); ieee80211_node_detach(ic); ifmedia_removeall(&ic->ic_media); IEEE80211_LOCK_DESTROY(ic); IEEE80211_BEACON_LOCK_DESTROY(ic); bpfdetach(ifp); ether_ifdetach(ifp); } static __inline int mapgsm(u_int freq, u_int flags) { freq *= 10; if (flags & IEEE80211_CHAN_QUARTER) freq += 5; else if (flags & IEEE80211_CHAN_HALF) freq += 10; else freq += 20; /* NB: there is no 907/20 wide but leave room */ return (freq - 906*10) / 5; } static __inline int mappsb(u_int freq, u_int flags) { return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5; } /* * Convert MHz frequency to IEEE channel number. */ int ieee80211_mhz2ieee(u_int freq, u_int flags) { #define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990) if (flags & IEEE80211_CHAN_GSM) return mapgsm(freq, flags); if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */ if (freq == 2484) return 14; if (freq < 2484) return ((int) freq - 2407) / 5; else return 15 + ((freq - 2512) / 20); } else if (flags & IEEE80211_CHAN_5GHZ) { /* 5Ghz band */ if (freq <= 5000) { /* XXX check regdomain? */ if (IS_FREQ_IN_PSB(freq)) return mappsb(freq, flags); return (freq - 4000) / 5; } else return (freq - 5000) / 5; } else { /* either, guess */ if (freq == 2484) return 14; if (freq < 2484) { if (907 <= freq && freq <= 922) return mapgsm(freq, flags); return ((int) freq - 2407) / 5; } if (freq < 5000) { if (IS_FREQ_IN_PSB(freq)) return mappsb(freq, flags); else if (freq > 4900) return (freq - 4000) / 5; else return 15 + ((freq - 2512) / 20); } return (freq - 5000) / 5; } #undef IS_FREQ_IN_PSB } /* * Convert channel to IEEE channel number. */ int ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c) { if (c == NULL) { if_printf(ic->ic_ifp, "invalid channel (NULL)\n"); return 0; /* XXX */ } return (c == IEEE80211_CHAN_ANYC ? IEEE80211_CHAN_ANY : c->ic_ieee); } /* * Convert IEEE channel number to MHz frequency. */ u_int ieee80211_ieee2mhz(u_int chan, u_int flags) { if (flags & IEEE80211_CHAN_GSM) return 907 + 5 * (chan / 10); 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 */ if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) { chan -= 37; return 4940 + chan*5 + (chan % 5 ? 2 : 0); } return 5000 + (chan*5); } else { /* either, guess */ /* XXX can't distinguish PSB+GSM channels */ 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); } } /* * Locate a channel given a frequency+flags. We cache * the previous lookup to optimize swithing between two * channels--as happens with dynamic turbo. */ struct ieee80211_channel * ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags) { struct ieee80211_channel *c; int i; flags &= IEEE80211_CHAN_ALLTURBO; c = ic->ic_prevchan; if (c != NULL && c->ic_freq == freq && (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags) return c; /* brute force search */ for (i = 0; i < ic->ic_nchans; i++) { c = &ic->ic_channels[i]; if (c->ic_freq == freq && (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags) return c; } return NULL; } /* * Locate a channel given a channel number+flags. We cache * the previous lookup to optimize switching between two * channels--as happens with dynamic turbo. */ struct ieee80211_channel * ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags) { struct ieee80211_channel *c; int i; flags &= IEEE80211_CHAN_ALLTURBO; c = ic->ic_prevchan; if (c != NULL && c->ic_ieee == ieee && (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags) return c; /* brute force search */ for (i = 0; i < ic->ic_nchans; i++) { c = &ic->ic_channels[i]; if (c->ic_ieee == ieee && (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags) return c; } return NULL; } static void addmedia(struct ieee80211com *ic, int mode, int mword) { #define TURBO(m) ((m) | IFM_IEEE80211_TURBO) #define ADD(_ic, _s, _o) \ ifmedia_add(&(_ic)->ic_media, \ IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL) static const u_int mopts[IEEE80211_MODE_MAX] = { IFM_AUTO, /* IEEE80211_MODE_AUTO */ IFM_IEEE80211_11A, /* IEEE80211_MODE_11A */ IFM_IEEE80211_11B, /* IEEE80211_MODE_11B */ IFM_IEEE80211_11G, /* IEEE80211_MODE_11G */ IFM_IEEE80211_FH, /* IEEE80211_MODE_FH */ TURBO(IFM_IEEE80211_11A), /* IEEE80211_MODE_TURBO_A */ TURBO(IFM_IEEE80211_11G), /* IEEE80211_MODE_TURBO_G */ TURBO(IFM_IEEE80211_11A), /* IEEE80211_MODE_STURBO_A */ IFM_IEEE80211_11NA, /* IEEE80211_MODE_11NA */ IFM_IEEE80211_11NG, /* IEEE80211_MODE_11NG */ }; u_int mopt; KASSERT(mode < IEEE80211_MODE_MAX, ("bad mode %u", mode)); mopt = mopts[mode]; KASSERT(mopt != 0 || mode == IEEE80211_MODE_AUTO, ("no media mapping for mode %u", mode)); ADD(ic, mword, mopt); /* e.g. 11a auto */ 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); if (ic->ic_caps & IEEE80211_C_MONITOR) ADD(ic, mword, mopt | IFM_IEEE80211_MONITOR); #undef ADD #undef TURBO } /* * 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 ieee80211com *ic, ifm_change_cb_t media_change, ifm_stat_cb_t media_stat) { struct ifnet *ifp = ic->ic_ifp; int i, j, mode, rate, maxrate, mword, r; const struct ieee80211_rateset *rs; struct ieee80211_rateset allrates; /* NB: this works because the structure is initialized to zero */ if (LIST_EMPTY(&ic->ic_media.ifm_list)) { /* * Do late attach work that must wait for any subclass * (i.e. driver) work such as overriding methods. */ ieee80211_node_lateattach(ic); } else { /* * We are re-initializing the channel list; clear * the existing media state as the media routines * don't suppress duplicates. */ ifmedia_removeall(&ic->ic_media); ieee80211_chan_init(ic); } ieee80211_power_lateattach(ic); /* * Fill in media characteristics. */ ifmedia_init(&ic->ic_media, 0, media_change, media_stat); maxrate = 0; /* * Add media for legacy operating modes. */ memset(&allrates, 0, sizeof(allrates)); for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) { if (isclr(ic->ic_modecaps, mode)) continue; addmedia(ic, mode, IFM_AUTO); if (mode == IEEE80211_MODE_AUTO) continue; 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; addmedia(ic, mode, mword); /* * Add legacy 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; } } for (i = 0; i < allrates.rs_nrates; i++) { mword = ieee80211_rate2media(ic, allrates.rs_rates[i], IEEE80211_MODE_AUTO); if (mword == 0) continue; /* NB: remove media options from mword */ addmedia(ic, IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword)); } /* * Add HT/11n media. Note that we do not have enough * bits in the media subtype to express the MCS so we * use a "placeholder" media subtype and any fixed MCS * must be specified with a different mechanism. */ for (; mode < IEEE80211_MODE_MAX; mode++) { if (isclr(ic->ic_modecaps, mode)) continue; addmedia(ic, mode, IFM_AUTO); addmedia(ic, mode, IFM_IEEE80211_MCS); } if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) || isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) { addmedia(ic, IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS); /* XXX could walk htrates */ /* XXX known array size */ if (ieee80211_htrates[15] > maxrate) maxrate = ieee80211_htrates[15]; } /* NB: strip explicit mode; we're actually in autoselect */ ifmedia_set(&ic->ic_media, media_status(ic->ic_opmode, ic->ic_curchan) &~ IFM_MMASK); if (maxrate) ifp->if_baudrate = IF_Mbps(maxrate); } const struct ieee80211_rateset * ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c) { if (IEEE80211_IS_CHAN_HALF(c)) return &ieee80211_rateset_half; if (IEEE80211_IS_CHAN_QUARTER(c)) return &ieee80211_rateset_quarter; if (IEEE80211_IS_CHAN_HTA(c)) return &ic->ic_sup_rates[IEEE80211_MODE_11A]; if (IEEE80211_IS_CHAN_HTG(c)) { /* XXX does this work for basic rates? */ return &ic->ic_sup_rates[IEEE80211_MODE_11G]; } return &ic->ic_sup_rates[ieee80211_chan2mode(c)]; } void ieee80211_announce(struct ieee80211com *ic) { struct ifnet *ifp = ic->ic_ifp; int i, mode, rate, mword; const struct ieee80211_rateset *rs; /* NB: skip AUTO since it has no rates */ for (mode = IEEE80211_MODE_AUTO+1; mode < IEEE80211_MODE_11NA; mode++) { if (isclr(ic->ic_modecaps, mode)) continue; if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]); rs = &ic->ic_sup_rates[mode]; for (i = 0; i < rs->rs_nrates; i++) { mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode); if (mword == 0) continue; rate = ieee80211_media2rate(mword); printf("%s%d%sMbps", (i != 0 ? " " : ""), rate / 2, ((rate & 0x1) != 0 ? ".5" : "")); } printf("\n"); } ieee80211_ht_announce(ic); } void ieee80211_announce_channels(struct ieee80211com *ic) { const struct ieee80211_channel *c; char type; int i, cw; printf("Chan Freq CW RegPwr MinPwr MaxPwr\n"); for (i = 0; i < ic->ic_nchans; i++) { c = &ic->ic_channels[i]; if (IEEE80211_IS_CHAN_ST(c)) type = 'S'; else if (IEEE80211_IS_CHAN_108A(c)) type = 'T'; else if (IEEE80211_IS_CHAN_108G(c)) type = 'G'; else if (IEEE80211_IS_CHAN_HT(c)) type = 'n'; else if (IEEE80211_IS_CHAN_A(c)) type = 'a'; else if (IEEE80211_IS_CHAN_ANYG(c)) type = 'g'; else if (IEEE80211_IS_CHAN_B(c)) type = 'b'; else type = 'f'; if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c)) cw = 40; else if (IEEE80211_IS_CHAN_HALF(c)) cw = 10; else if (IEEE80211_IS_CHAN_QUARTER(c)) cw = 5; else cw = 20; printf("%4d %4d%c %2d%c %6d %4d.%d %4d.%d\n" , c->ic_ieee, c->ic_freq, type , cw , IEEE80211_IS_CHAN_HT40U(c) ? '+' : IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' ' , c->ic_maxregpower , c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0 , c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0 ); } } /* * Find an instance by it's mac address. */ struct ieee80211com * ieee80211_find_vap(const uint8_t mac[IEEE80211_ADDR_LEN]) { struct ieee80211com *ic; /* XXX lock */ SLIST_FOREACH(ic, &ieee80211_list, ic_next) if (IEEE80211_ADDR_EQ(mac, ic->ic_myaddr)) return ic; return NULL; } static struct ieee80211com * ieee80211_find_instance(struct ifnet *ifp) { struct ieee80211com *ic; /* XXX lock */ /* XXX not right for multiple instances but works for now */ SLIST_FOREACH(ic, &ieee80211_list, ic_next) if (ic->ic_ifp == ifp) return ic; return NULL; } 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 } /* * Convert a media specification to a rate index and possibly a mode * (if the rate is fixed and the mode is specified as ``auto'' then * we need to lock down the mode so the index is meanginful). */ static int checkrate(struct ieee80211com *ic, enum ieee80211_phymode mode, int rate) { /* * Check the rate table for the specified/current phy. */ if (mode == IEEE80211_MODE_AUTO) { int i; /* * In autoselect mode search for the rate. */ for (i = IEEE80211_MODE_11A; i < IEEE80211_MODE_MAX; i++) { if (isset(ic->ic_modecaps, i) && findrate(ic, i, rate) != -1) return 1; } return 0; } else { /* * Mode is fixed, check for rate. */ return (findrate(ic, mode, rate) != -1); } } /* * Handle a media change request. */ int ieee80211_media_change(struct ifnet *ifp) { struct ieee80211com *ic; struct ifmedia_entry *ime; enum ieee80211_opmode newopmode; enum ieee80211_phymode newphymode; int newrate, error = 0; ic = ieee80211_find_instance(ifp); if (!ic) { if_printf(ifp, "%s: no 802.11 instance!\n", __func__); return EINVAL; } 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_IEEE80211_FH: newphymode = IEEE80211_MODE_FH; break; case IFM_IEEE80211_11NA: newphymode = IEEE80211_MODE_11NA; break; case IFM_IEEE80211_11NG: newphymode = IEEE80211_MODE_11NG; break; case IFM_AUTO: newphymode = IEEE80211_MODE_AUTO; break; default: return EINVAL; } /* * Turbo mode is an ``option''. * XXX does not apply to AUTO */ if (ime->ifm_media & IFM_IEEE80211_TURBO) { if (newphymode == IEEE80211_MODE_11A) { if (ic->ic_flags & IEEE80211_F_TURBOP) newphymode = IEEE80211_MODE_TURBO_A; else newphymode = IEEE80211_MODE_STURBO_A; } else if (newphymode == IEEE80211_MODE_11G) newphymode = IEEE80211_MODE_TURBO_G; else return EINVAL; } /* XXX HT40 +/- */ /* * Next, the fixed/variable rate. */ newrate = ic->ic_fixed_rate; if (IFM_SUBTYPE(ime->ifm_media) != IFM_AUTO) { /* * Convert media subtype to rate. */ newrate = ieee80211_media2rate(ime->ifm_media); if (newrate == 0 || !checkrate(ic, newphymode, newrate)) return EINVAL; } else newrate = IEEE80211_FIXED_RATE_NONE; /* * 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 if (ime->ifm_media & IFM_IEEE80211_MONITOR) newopmode = IEEE80211_M_MONITOR; else newopmode = IEEE80211_M_STA; /* * Handle phy mode change. */ if (ic->ic_des_mode != newphymode) { /* change phy mode */ ic->ic_des_mode = newphymode; error = ENETRESET; } /* * Committed to changes, install the rate setting. */ if (ic->ic_fixed_rate != newrate) { ic->ic_fixed_rate = newrate; /* 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: case IEEE80211_M_WDS: ic->ic_flags &= ~IEEE80211_F_IBSSON; break; case IEEE80211_M_IBSS: ic->ic_flags |= IEEE80211_F_IBSSON; break; } /* * Yech, slot time may change depending on the * operating mode so reset it to be sure everything * is setup appropriately. */ ieee80211_reset_erp(ic); ieee80211_wme_initparams(ic); /* after opmode change */ error = ENETRESET; } #ifdef notdef if (error == 0) ifp->if_baudrate = ifmedia_baudrate(ime->ifm_media); #endif return error; } /* * Common code to calculate the media status word * from the operating mode and channel state. */ static int media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan) { int status; status = IFM_IEEE80211; switch (opmode) { case IEEE80211_M_STA: break; case IEEE80211_M_IBSS: status |= IFM_IEEE80211_ADHOC; break; case IEEE80211_M_HOSTAP: status |= IFM_IEEE80211_HOSTAP; break; case IEEE80211_M_MONITOR: status |= IFM_IEEE80211_MONITOR; break; case IEEE80211_M_AHDEMO: status |= IFM_IEEE80211_ADHOC | IFM_FLAG0; break; case IEEE80211_M_WDS: /* should not come here */ break; } if (IEEE80211_IS_CHAN_HTA(chan)) { status |= IFM_IEEE80211_11NA; } else if (IEEE80211_IS_CHAN_HTG(chan)) { status |= IFM_IEEE80211_11NG; } else if (IEEE80211_IS_CHAN_A(chan)) { status |= IFM_IEEE80211_11A; } else if (IEEE80211_IS_CHAN_B(chan)) { status |= IFM_IEEE80211_11B; } else if (IEEE80211_IS_CHAN_ANYG(chan)) { status |= IFM_IEEE80211_11G; } else if (IEEE80211_IS_CHAN_FHSS(chan)) { status |= IFM_IEEE80211_FH; } /* XXX else complain? */ if (IEEE80211_IS_CHAN_TURBO(chan)) status |= IFM_IEEE80211_TURBO; return status; } void ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr) { struct ieee80211com *ic; enum ieee80211_phymode mode; const struct ieee80211_rateset *rs; ic = ieee80211_find_instance(ifp); if (!ic) { if_printf(ifp, "%s: no 802.11 instance!\n", __func__); return; } imr->ifm_status = IFM_AVALID; /* * NB: use the current channel's mode to lock down a xmit * rate only when running; otherwise we may have a mismatch * in which case the rate will not be convertible. */ if (ic->ic_state == IEEE80211_S_RUN) { imr->ifm_status |= IFM_ACTIVE; mode = ieee80211_chan2mode(ic->ic_curchan); } else mode = IEEE80211_MODE_AUTO; imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan); /* * Calculate a current rate if possible. */ if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { /* * A fixed rate is set, report that. */ imr->ifm_active |= ieee80211_rate2media(ic, ic->ic_fixed_rate, mode); } else if (ic->ic_opmode == IEEE80211_M_STA) { /* * In station mode report the current transmit rate. * XXX HT rate */ rs = &ic->ic_bss->ni_rates; imr->ifm_active |= ieee80211_rate2media(ic, rs->rs_rates[ic->ic_bss->ni_txrate], mode); } else imr->ifm_active |= IFM_AUTO; } /* * 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) { /* * Adjust basic rates in 11b/11g supported rate set. * Note that if operating on a hal/quarter rate channel * this is a noop as those rates sets are different * and used instead. */ if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B) ieee80211_set11gbasicrates(&ic->ic_sup_rates[mode], mode); ic->ic_curmode = mode; ieee80211_reset_erp(ic); /* reset ERP state */ ieee80211_wme_initparams(ic); /* reset WME stat */ return 0; } /* * Return the phy mode for with the specified channel. */ enum ieee80211_phymode ieee80211_chan2mode(const struct ieee80211_channel *chan) { if (IEEE80211_IS_CHAN_HTA(chan)) return IEEE80211_MODE_11NA; else if (IEEE80211_IS_CHAN_HTG(chan)) return IEEE80211_MODE_11NG; else if (IEEE80211_IS_CHAN_108G(chan)) return IEEE80211_MODE_TURBO_G; else if (IEEE80211_IS_CHAN_ST(chan)) return IEEE80211_MODE_STURBO_A; else if (IEEE80211_IS_CHAN_TURBO(chan)) return IEEE80211_MODE_TURBO_A; else if (IEEE80211_IS_CHAN_A(chan)) return IEEE80211_MODE_11A; else if (IEEE80211_IS_CHAN_ANYG(chan)) return IEEE80211_MODE_11G; else if (IEEE80211_IS_CHAN_B(chan)) return IEEE80211_MODE_11B; else if (IEEE80211_IS_CHAN_FHSS(chan)) return IEEE80211_MODE_FH; /* NB: should not get here */ printf("%s: cannot map channel to mode; freq %u flags 0x%x\n", __func__, chan->ic_freq, chan->ic_flags); return IEEE80211_MODE_11B; } struct ratemedia { u_int match; /* rate + mode */ u_int media; /* if_media rate */ }; static int findmedia(const struct ratemedia rates[], int n, u_int match) { int i; for (i = 0; i < n; i++) if (rates[i].match == match) return rates[i].media; return IFM_AUTO; } /* * Convert IEEE80211 rate value to ifmedia subtype. * Rate is either a legacy rate in units of 0.5Mbps * or an MCS index. */ int ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode) { #define N(a) (sizeof(a) / sizeof(a[0])) static const struct ratemedia rates[] = { { 2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 }, { 4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 }, { 2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 }, { 4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 }, { 11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 }, { 22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 }, { 44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 }, { 12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 }, { 18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 }, { 24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 }, { 36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 }, { 48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 }, { 72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 }, { 96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 }, { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 }, { 2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 }, { 4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 }, { 11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 }, { 22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 }, { 12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 }, { 18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 }, { 24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 }, { 36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 }, { 48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 }, { 72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 }, { 96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 }, { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 }, { 6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 }, { 9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 }, { 54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 }, /* NB: OFDM72 doesn't realy exist so we don't handle it */ }; static const struct ratemedia htrates[] = { { 0, IFM_IEEE80211_MCS }, { 1, IFM_IEEE80211_MCS }, { 2, IFM_IEEE80211_MCS }, { 3, IFM_IEEE80211_MCS }, { 4, IFM_IEEE80211_MCS }, { 5, IFM_IEEE80211_MCS }, { 6, IFM_IEEE80211_MCS }, { 7, IFM_IEEE80211_MCS }, { 8, IFM_IEEE80211_MCS }, { 9, IFM_IEEE80211_MCS }, { 10, IFM_IEEE80211_MCS }, { 11, IFM_IEEE80211_MCS }, { 12, IFM_IEEE80211_MCS }, { 13, IFM_IEEE80211_MCS }, { 14, IFM_IEEE80211_MCS }, { 15, IFM_IEEE80211_MCS }, }; int m; /* * Check 11n rates first for match as an MCS. */ if (mode == IEEE80211_MODE_11NA) { if (rate & IEEE80211_RATE_MCS) { rate &= ~IEEE80211_RATE_MCS; m = findmedia(htrates, N(htrates), rate); if (m != IFM_AUTO) return m | IFM_IEEE80211_11NA; } } else if (mode == IEEE80211_MODE_11NG) { /* NB: 12 is ambiguous, it will be treated as an MCS */ if (rate & IEEE80211_RATE_MCS) { rate &= ~IEEE80211_RATE_MCS; m = findmedia(htrates, N(htrates), rate); if (m != IFM_AUTO) return m | IFM_IEEE80211_11NG; } } rate &= IEEE80211_RATE_VAL; switch (mode) { case IEEE80211_MODE_11A: case IEEE80211_MODE_11NA: case IEEE80211_MODE_TURBO_A: case IEEE80211_MODE_STURBO_A: return findmedia(rates, N(rates), rate | IFM_IEEE80211_11A); case IEEE80211_MODE_11B: return findmedia(rates, N(rates), rate | IFM_IEEE80211_11B); case IEEE80211_MODE_FH: return findmedia(rates, N(rates), rate | IFM_IEEE80211_FH); case IEEE80211_MODE_AUTO: /* NB: ic may be NULL for some drivers */ if (ic && ic->ic_phytype == IEEE80211_T_FH) return findmedia(rates, N(rates), rate | IFM_IEEE80211_FH); /* NB: hack, 11g matches both 11b+11a rates */ /* fall thru... */ case IEEE80211_MODE_11G: case IEEE80211_MODE_11NG: case IEEE80211_MODE_TURBO_G: return findmedia(rates, N(rates), rate | IFM_IEEE80211_11G); } 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 */ 0, /* IFM_IEEE80211_DS354k */ 0, /* IFM_IEEE80211_DS512k */ 6, /* IFM_IEEE80211_OFDM3 */ 9, /* IFM_IEEE80211_OFDM4 */ 54, /* IFM_IEEE80211_OFDM27 */ -1, /* IFM_IEEE80211_MCS */ }; return IFM_SUBTYPE(mword) < N(ieeerates) ? ieeerates[IFM_SUBTYPE(mword)] : 0; #undef N }