/* $NetBSD: ieee80211_node.c,v 1.84 2024/07/05 04:31:53 rin Exp $ */ /* * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002-2005 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. * 3. The name of the author may not 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. * * 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 #ifdef __FreeBSD__ __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_node.c,v 1.65 2005/08/13 17:50:21 sam Exp $"); #endif #ifdef __NetBSD__ __KERNEL_RCSID(0, "$NetBSD: ieee80211_node.c,v 1.84 2024/07/05 04:31:53 rin Exp $"); #endif #ifdef _KERNEL_OPT #include "opt_inet.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #endif /* * Association id's are managed with a bit vector. */ #define IEEE80211_AID_SET(b, w) \ ((w)[IEEE80211_AID(b) / 32] |= (1 << (IEEE80211_AID(b) % 32))) #define IEEE80211_AID_CLR(b, w) \ ((w)[IEEE80211_AID(b) / 32] &= ~(1 << (IEEE80211_AID(b) % 32))) #define IEEE80211_AID_ISSET(b, w) \ ((w)[IEEE80211_AID(b) / 32] & (1 << (IEEE80211_AID(b) % 32))) static struct ieee80211_node *node_alloc(struct ieee80211_node_table *); static void node_cleanup(struct ieee80211_node *); static void node_free(struct ieee80211_node *); static u_int8_t node_getrssi(const struct ieee80211_node *); static void ieee80211_setup_node(struct ieee80211_node_table *, struct ieee80211_node *, const u_int8_t *); static void _ieee80211_free_node(struct ieee80211_node *); static void ieee80211_free_allnodes(struct ieee80211_node_table *); static void ieee80211_timeout_scan_candidates(struct ieee80211_node_table *); static void ieee80211_timeout_stations(struct ieee80211_node_table *); static void ieee80211_set_tim(struct ieee80211_node *, int set); static void ieee80211_node_table_init(struct ieee80211com *ic, struct ieee80211_node_table *nt, const char *name, int inact, int keyixmax, void (*timeout)(struct ieee80211_node_table *)); static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt); MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state"); void ieee80211_node_attach(struct ieee80211com *ic) { ic->ic_node_alloc = node_alloc; ic->ic_node_free = node_free; ic->ic_node_cleanup = node_cleanup; ic->ic_node_getrssi = node_getrssi; /* default station inactivity timer settings */ ic->ic_inact_init = IEEE80211_INACT_INIT; ic->ic_inact_auth = IEEE80211_INACT_AUTH; ic->ic_inact_run = IEEE80211_INACT_RUN; ic->ic_inact_probe = IEEE80211_INACT_PROBE; /* NB: driver should override */ ic->ic_max_aid = IEEE80211_AID_DEF; ic->ic_set_tim = ieee80211_set_tim; } void ieee80211_node_lateattach(struct ieee80211com *ic) { struct ieee80211_rsnparms *rsn; if (ic->ic_max_aid > IEEE80211_AID_MAX) ic->ic_max_aid = IEEE80211_AID_MAX; ic->ic_aid_bitmap = malloc(howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t), M_DEVBUF, M_WAITOK | M_ZERO); /* XXX defer until using hostap/ibss mode */ ic->ic_tim_len = howmany(ic->ic_max_aid, 8) * sizeof(u_int8_t); ic->ic_tim_bitmap = malloc(ic->ic_tim_len, M_DEVBUF, M_WAITOK | M_ZERO); ieee80211_node_table_init(ic, &ic->ic_sta, "station", IEEE80211_INACT_INIT, ic->ic_crypto.cs_max_keyix, ieee80211_timeout_stations); ieee80211_node_table_init(ic, &ic->ic_scan, "scan", IEEE80211_INACT_SCAN, 0, ieee80211_timeout_scan_candidates); ieee80211_reset_bss(ic); /* * Setup "global settings" in the bss node so that * each new station automatically inherits them. */ rsn = &ic->ic_bss->ni_rsn; /* WEP, TKIP, and AES-CCM are always supported */ rsn->rsn_ucastcipherset |= 1<rsn_ucastcipherset |= 1<rsn_ucastcipherset |= 1<ic_caps & IEEE80211_C_AES) rsn->rsn_ucastcipherset |= 1<ic_caps & IEEE80211_C_CKIP) rsn->rsn_ucastcipherset |= 1<rsn_ucastcipher = IEEE80211_CIPHER_WEP; rsn->rsn_ucastkeylen = 104 / NBBY; /* * WPA says the multicast cipher is the lowest unicast * cipher supported. But we skip WEP which would * otherwise be used based on this criteria. */ rsn->rsn_mcastcipher = IEEE80211_CIPHER_TKIP; rsn->rsn_mcastkeylen = 128 / NBBY; /* * We support both WPA-PSK and 802.1x; the one used * is determined by the authentication mode and the * setting of the PSK state. */ rsn->rsn_keymgmtset = WPA_ASE_8021X_UNSPEC | WPA_ASE_8021X_PSK; rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; ic->ic_auth = ieee80211_authenticator_get(ic->ic_bss->ni_authmode); } void ieee80211_node_detach(struct ieee80211com *ic) { if (ic->ic_bss != NULL) { ieee80211_free_node(ic->ic_bss); ic->ic_bss = NULL; } ieee80211_node_table_cleanup(&ic->ic_scan); ieee80211_node_table_cleanup(&ic->ic_sta); if (ic->ic_aid_bitmap != NULL) { free(ic->ic_aid_bitmap, M_DEVBUF); ic->ic_aid_bitmap = NULL; } if (ic->ic_tim_bitmap != NULL) { free(ic->ic_tim_bitmap, M_DEVBUF); ic->ic_tim_bitmap = NULL; } } /* * Port authorize/unauthorize interfaces for use by an authenticator. */ void ieee80211_node_authorize(struct ieee80211_node *ni) { struct ieee80211com *ic = ni->ni_ic; ni->ni_flags |= IEEE80211_NODE_AUTH; ni->ni_inact_reload = ic->ic_inact_run; } void ieee80211_node_unauthorize(struct ieee80211_node *ni) { ni->ni_flags &= ~IEEE80211_NODE_AUTH; } /* * Set/change the channel. The rate set is also updated as * to insure a consistent view by drivers. */ static void ieee80211_set_chan(struct ieee80211com *ic, struct ieee80211_node *ni, struct ieee80211_channel *chan) { if (chan == IEEE80211_CHAN_ANYC) /* XXX while scanning */ chan = ic->ic_curchan; ni->ni_chan = chan; ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)]; } /* * AP scanning support. */ #ifdef IEEE80211_DEBUG static void dump_chanlist(const u_char chans[]) { const char *sep; int i; sep = " "; for (i = 0; i < IEEE80211_CHAN_MAX; i++) if (isset(chans, i)) { printf("%s%u", sep, i); sep = ", "; } } #endif /* IEEE80211_DEBUG */ /* * Initialize the channel set to scan based on the * of available channels and the current PHY mode. */ static void ieee80211_reset_scan(struct ieee80211com *ic) { /* XXX ic_des_chan should be handled with ic_chan_active */ if (ic->ic_des_chan != IEEE80211_CHAN_ANYC) { memset(ic->ic_chan_scan, 0, sizeof(ic->ic_chan_scan)); setbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, ic->ic_des_chan)); } else memcpy(ic->ic_chan_scan, ic->ic_chan_active, sizeof(ic->ic_chan_active)); #ifdef IEEE80211_DEBUG if (ieee80211_msg_scan(ic)) { printf("%s: scan set:", __func__); dump_chanlist(ic->ic_chan_scan); printf(" start chan %u\n", ieee80211_chan2ieee(ic, ic->ic_curchan)); } #endif /* IEEE80211_DEBUG */ } /* * Begin an active scan. */ void ieee80211_begin_scan(struct ieee80211com *ic, int reset) { ic->ic_scan.nt_scangen++; /* * In all but hostap mode scanning starts off in * an active mode before switching to passive. */ if (ic->ic_opmode != IEEE80211_M_HOSTAP) { ic->ic_flags |= IEEE80211_F_ASCAN; ic->ic_stats.is_scan_active++; } else ic->ic_stats.is_scan_passive++; IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "begin %s scan in %s mode, scangen %u\n", (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive", ieee80211_phymode_name[ic->ic_curmode], ic->ic_scan.nt_scangen); /* * Clear scan state and flush any previously seen AP's. */ ieee80211_reset_scan(ic); if (reset) ieee80211_free_allnodes(&ic->ic_scan); ic->ic_flags |= IEEE80211_F_SCAN; /* Scan the next channel. */ ieee80211_next_scan(ic); } /* * Switch to the next channel marked for scanning. */ int ieee80211_next_scan(struct ieee80211com *ic) { struct ieee80211_channel *chan; /* * Insure any previous mgt frame timeouts don't fire. * This assumes the driver does the right thing in * flushing anything queued in the driver and below. */ ic->ic_mgt_timer = 0; ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; chan = ic->ic_curchan; do { if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) chan = &ic->ic_channels[0]; if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s: chan %d->%d\n", __func__, ieee80211_chan2ieee(ic, ic->ic_curchan), ieee80211_chan2ieee(ic, chan)); ic->ic_curchan = chan; /* * XXX drivers should do this as needed, * XXX for now maintain compatibility */ ic->ic_bss->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)]; ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); return 1; } } while (chan != ic->ic_curchan); ieee80211_end_scan(ic); return 0; } /* * Probe the current channel, if allowed, while scanning. * If the channel is not marked passive-only then send * a probe request immediately. Otherwise mark state and * listen for beacons on the channel; if we receive something * then we'll transmit a probe request. */ void ieee80211_probe_curchan(struct ieee80211com *ic, int force) { struct ifnet *ifp = ic->ic_ifp; if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 || force) { /* * XXX send both broadcast+directed probe request */ ieee80211_send_probereq(ic->ic_bss, ic->ic_myaddr, ifp->if_broadcastaddr, ifp->if_broadcastaddr, ic->ic_des_essid, ic->ic_des_esslen, ic->ic_opt_ie, ic->ic_opt_ie_len); } else ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN; } static __inline void copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss) { /* propagate useful state */ nbss->ni_authmode = obss->ni_authmode; nbss->ni_txpower = obss->ni_txpower; nbss->ni_vlan = obss->ni_vlan; nbss->ni_rsn = obss->ni_rsn; /* XXX statistics? */ } void ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) { struct ieee80211_node_table *nt; struct ieee80211_node *ni; IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s: creating ibss\n", __func__); /* * Create the station/neighbor table. Note that for adhoc * mode we make the initial inactivity timer longer since * we create nodes only through discovery and they typically * are long-lived associations. */ nt = &ic->ic_sta; IEEE80211_NODE_LOCK(nt); if (ic->ic_opmode == IEEE80211_M_HOSTAP) { nt->nt_name = "station"; nt->nt_inact_init = ic->ic_inact_init; } else { nt->nt_name = "neighbor"; nt->nt_inact_init = ic->ic_inact_run; } IEEE80211_NODE_UNLOCK(nt); ni = ieee80211_alloc_node(&ic->ic_sta, ic->ic_myaddr); if (ni == NULL) { /* XXX recovery? */ return; } IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); ni->ni_esslen = ic->ic_des_esslen; memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); copy_bss(ni, ic->ic_bss); ni->ni_intval = ic->ic_bintval; if (ic->ic_flags & IEEE80211_F_PRIVACY) ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; if (ic->ic_phytype == IEEE80211_T_FH) { ni->ni_fhdwell = 200; /* XXX */ ni->ni_fhindex = 1; } if (ic->ic_opmode == IEEE80211_M_IBSS) { ic->ic_flags |= IEEE80211_F_SIBSS; ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS; /* XXX */ if (ic->ic_flags & IEEE80211_F_DESBSSID) IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid); else ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ } /* * Fix the channel and related attributes. */ ieee80211_set_chan(ic, ni, chan); ic->ic_curchan = chan; ic->ic_curmode = ieee80211_chan2mode(ic, chan); /* * Do mode-specific rate setup. */ if (ic->ic_curmode == IEEE80211_MODE_11G) { /* * Use a mixed 11b/11g rate set. */ ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11G); } else if (ic->ic_curmode == IEEE80211_MODE_11B) { /* * Force pure 11b rate set. */ ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11B); } (void)ieee80211_sta_join(ic, ieee80211_ref_node(ni)); } void ieee80211_reset_bss(struct ieee80211com *ic) { struct ieee80211_node *ni, *obss; ieee80211_node_table_reset(&ic->ic_scan); ieee80211_node_table_reset(&ic->ic_sta); ni = ieee80211_alloc_node(&ic->ic_scan, ic->ic_myaddr); IASSERT(ni != NULL, ("unable to setup initial BSS node")); obss = ic->ic_bss; ic->ic_bss = ieee80211_ref_node(ni); if (obss != NULL) { copy_bss(ni, obss); ni->ni_intval = ic->ic_bintval; ieee80211_free_node(obss); } } /* XXX tunable */ #define STA_FAILS_MAX 2 /* assoc failures before ignored */ static int ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni) { u_int8_t rate; int fail; fail = 0; if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) fail |= 0x01; if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && ni->ni_chan != ic->ic_des_chan) fail |= 0x01; if (ic->ic_opmode == IEEE80211_M_IBSS) { if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) fail |= 0x02; } else { if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) fail |= 0x02; } if (ic->ic_flags & IEEE80211_F_PRIVACY) { if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) fail |= 0x04; } else { /* XXX does this mean privacy is supported or required? */ if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) fail |= 0x04; } rate = ieee80211_fix_rate(ni, IEEE80211_R_DONEGO | IEEE80211_R_DOFRATE); if (rate & IEEE80211_RATE_BASIC) fail |= 0x08; if (ic->ic_des_esslen != 0 && (ni->ni_esslen != ic->ic_des_esslen || memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0)) fail |= 0x10; if ((ic->ic_flags & IEEE80211_F_DESBSSID) && !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) fail |= 0x20; if (ni->ni_fails >= STA_FAILS_MAX) fail |= 0x40; /* If no ESS/IBSS is desired, do not match any. */ if (ic->ic_des_esslen == 0) fail |= 0x80; #ifdef IEEE80211_DEBUG if (ieee80211_msg_scan(ic)) { printf(" %c %s", fail & 0x40 ? '=' : fail & 0x80 ? '^' : fail ? '-' : '+', ether_sprintf(ni->ni_macaddr)); printf(" %s%c", ether_sprintf(ni->ni_bssid), fail & 0x20 ? '!' : ' '); printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), fail & 0x01 ? '!' : ' '); printf(" %+4d", ni->ni_rssi); printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, fail & 0x08 ? '!' : ' '); printf(" %4s%c", (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "????", fail & 0x02 ? '!' : ' '); printf(" %3s%c ", (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? "wep" : "no", fail & 0x04 ? '!' : ' '); ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); printf("%s\n", fail & 0x10 ? "!" : ""); } #endif return fail; } static __inline u_int8_t maxrate(const struct ieee80211_node *ni) { const struct ieee80211_rateset *rs = &ni->ni_rates; /* NB: assumes rate set is sorted (happens on frame receive) */ return rs->rs_rates[rs->rs_nrates-1] & IEEE80211_RATE_VAL; } /* * Compare the capabilities of two nodes and decide which is * more desirable (return >0 if a is considered better). Note * that we assume compatibility/usability has already been checked * so we don't need to (e.g. validate whether privacy is supported). * Used to select the best scan candidate for association in a BSS. */ static int ieee80211_node_compare(struct ieee80211com *ic, const struct ieee80211_node *a, const struct ieee80211_node *b) { u_int8_t maxa, maxb; u_int8_t rssia, rssib; int weight; /* privacy support preferred */ if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) && (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) return 1; if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0 && (b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)) return -1; /* compare count of previous failures */ weight = b->ni_fails - a->ni_fails; if (abs(weight) > 1) return weight; rssia = ic->ic_node_getrssi(a); rssib = ic->ic_node_getrssi(b); if (abs(rssib - rssia) < 5) { /* best/max rate preferred if signal level close enough XXX */ maxa = maxrate(a); maxb = maxrate(b); if (maxa != maxb) return maxa - maxb; /* XXX use freq for channel preference */ /* for now just prefer 5 GHz band to all other bands */ if (IEEE80211_IS_CHAN_5GHZ(a->ni_chan) && !IEEE80211_IS_CHAN_5GHZ(b->ni_chan)) return 1; if (!IEEE80211_IS_CHAN_5GHZ(a->ni_chan) && IEEE80211_IS_CHAN_5GHZ(b->ni_chan)) return -1; } /* all things being equal, use signal level */ return rssia - rssib; } /* * Mark an ongoing scan stopped. */ void ieee80211_cancel_scan(struct ieee80211com *ic) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s: end %s scan\n", __func__, (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive"); ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN); ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; } /* * Complete a scan of potential channels. */ void ieee80211_end_scan(struct ieee80211com *ic) { struct ieee80211_node_table *nt = &ic->ic_scan; struct ieee80211_node *ni, *selbs; ieee80211_cancel_scan(ic); ieee80211_notify_scan_done(ic); #ifndef IEEE80211_NO_HOSTAP if (ic->ic_opmode == IEEE80211_M_HOSTAP) { u_int8_t maxrssi[IEEE80211_CHAN_MAX]; /* XXX off stack? */ int i, bestchan; u_int8_t rssi; /* * The passive scan to look for existing AP's completed, * select a channel to camp on. Identify the channels * that already have one or more AP's and try to locate * an unoccupied one. If that fails, pick a channel that * looks to be quietest. */ memset(maxrssi, 0, sizeof(maxrssi)); IEEE80211_NODE_LOCK(nt); TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { rssi = ic->ic_node_getrssi(ni); i = ieee80211_chan2ieee(ic, ni->ni_chan); if (rssi > maxrssi[i]) maxrssi[i] = rssi; } IEEE80211_NODE_UNLOCK(nt); /* XXX select channel more intelligently */ bestchan = -1; for (i = 0; i < IEEE80211_CHAN_MAX; i++) { if (isset(ic->ic_chan_active, i)) { /* * If the channel is unoccupied the max rssi * should be zero; just take it. Otherwise * track the channel with the lowest rssi and * use that when all channels appear occupied. */ if (maxrssi[i] == 0) { bestchan = i; break; } if (bestchan == -1 || maxrssi[i] < maxrssi[bestchan]) bestchan = i; } } if (bestchan != -1) { ieee80211_create_ibss(ic, &ic->ic_channels[bestchan]); return; } /* no suitable channel, should not happen */ } #endif /* !IEEE80211_NO_HOSTAP */ /* * When manually sequencing the state machine; scan just once * regardless of whether we have a candidate or not. The * controlling application is expected to setup state and * initiate an association. */ if (ic->ic_roaming == IEEE80211_ROAMING_MANUAL) return; /* * Automatic sequencing; look for a candidate and * if found join the network. */ /* NB: unlocked read should be ok */ if (TAILQ_FIRST(&nt->nt_node) == NULL) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s: no scan candidate\n", __func__); notfound: if (ic->ic_opmode == IEEE80211_M_IBSS && (ic->ic_flags & IEEE80211_F_IBSSON) && ic->ic_des_esslen != 0) { ieee80211_create_ibss(ic, ic->ic_ibss_chan); return; } /* * Decrement the failure counts so entries will be * reconsidered the next time around. We really want * to do this only for sta's where we've previously * had some success. */ IEEE80211_NODE_LOCK(nt); TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { if (ni->ni_fails) ni->ni_fails--; } IEEE80211_NODE_UNLOCK(nt); /* * Reset the list of channels to scan and start again. */ ieee80211_reset_scan(ic); ic->ic_flags |= IEEE80211_F_SCAN; ieee80211_next_scan(ic); return; } selbs = NULL; IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "\t%s\n", "macaddr bssid chan rssi rate flag wep essid"); IEEE80211_NODE_LOCK(nt); TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { if (ieee80211_match_bss(ic, ni) == 0) { if (selbs == NULL) selbs = ni; else if (ieee80211_node_compare(ic, ni, selbs) > 0) selbs = ni; } } if (selbs != NULL) /* NB: grab ref while dropping lock */ (void)ieee80211_ref_node(selbs); IEEE80211_NODE_UNLOCK(nt); if (selbs == NULL) goto notfound; if (!ieee80211_sta_join(ic, selbs)) { ieee80211_free_node(selbs); goto notfound; } } /* * Handle 802.11 ad hoc network merge. The * convention, set by the Wireless Ethernet Compatibility Alliance * (WECA), is that an 802.11 station will change its BSSID to match * the "oldest" 802.11 ad hoc network, on the same channel, that * has the station's desired SSID. The "oldest" 802.11 network * sends beacons with the greatest TSF timestamp. * * The caller is assumed to validate TSF's before attempting a merge. * * Return !0 if the BSSID changed, 0 otherwise. */ int ieee80211_ibss_merge(struct ieee80211_node *ni) { struct ieee80211com *ic = ni->ni_ic; if (ni == ic->ic_bss || IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { /* unchanged, nothing to do */ return 0; } if (ieee80211_match_bss(ic, ni) != 0) { /* capabilities mismatch */ IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "%s: merge failed, capabilities mismatch\n", __func__); ic->ic_stats.is_ibss_capmismatch++; return 0; } if (!ieee80211_sta_join(ic, ieee80211_ref_node(ni))) return 0; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__, ether_sprintf(ni->ni_bssid), ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "" ); ic->ic_flags &= ~IEEE80211_F_SIBSS; return 1; } /* * Join the specified IBSS/BSS network. The node is assumed to * be passed in with a held reference. */ int ieee80211_sta_join(struct ieee80211com *ic, struct ieee80211_node *selbs) { struct ieee80211_node *obss; if (ic->ic_opmode == IEEE80211_M_IBSS) { struct ieee80211_node_table *nt; /* * Delete unusable rates; we've already checked * that the negotiated rate set is acceptable. */ ieee80211_fix_rate(selbs, IEEE80211_R_DODEL); /* * Fill in the neighbor table; it will already * exist if we are simply switching mastership. * XXX ic_sta always setup so this is unnecessary? */ nt = &ic->ic_sta; IEEE80211_NODE_LOCK(nt); nt->nt_name = "neighbor"; nt->nt_inact_init = ic->ic_inact_run; IEEE80211_NODE_UNLOCK(nt); } /* * Committed to selbs, setup state. */ obss = ic->ic_bss; ic->ic_bss = selbs; /* NB: caller assumed to bump refcnt */ if (obss != NULL) { copy_bss(selbs, obss); ieee80211_free_node(obss); } /* * Set the erp state (mostly the slot time) to deal with * the auto-select case; this should be redundant if the * mode is locked. */ ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan); ic->ic_curchan = selbs->ni_chan; ieee80211_reset_erp(ic); ieee80211_wme_initparams(ic); if (ic->ic_opmode == IEEE80211_M_STA) ieee80211_new_state(ic, IEEE80211_S_AUTH, -1); else ieee80211_new_state(ic, IEEE80211_S_RUN, -1); return 1; } /* * Leave the specified IBSS/BSS network. The node is assumed to * be passed in with a held reference. */ void ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni) { ic->ic_node_cleanup(ni); ieee80211_notify_node_leave(ic, ni); } int ieee80211_get_rate(const struct ieee80211_node * const ni) { #define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL) int ix, rate; struct ieee80211com *ic = ni->ni_ic; const struct ieee80211_rateset *rs; IASSERT(ni != NULL, ("ni != NULL")); IASSERT(ieee80211_node_refcnt(ni) > 0, ("refcnt(ni) == %d", ieee80211_node_refcnt(ni))); IASSERT(ic != NULL, ("ic != NULL")); if (ic->ic_fixed_rate != IEEE80211_FIXED_RATE_NONE) { rs = &ic->ic_sup_rates[ic->ic_curmode]; rate = rs->rs_rates[ic->ic_fixed_rate] & IEEE80211_RATE_VAL; for (ix = ni->ni_rates.rs_nrates - 1; ix >= 0 && RATE(ix) != rate; ix--) ; if (ix < 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG, "%s: fixed rate %d (%d.%d Mb/s) not in rate set", __func__, ic->ic_fixed_rate, (rate * 5) / 10, (rate * 5) % 10); goto no_rate; } } else if (ic->ic_state == IEEE80211_S_RUN) { rate = ni->ni_rates.rs_rates[ni->ni_txrate]; } else { no_rate: rs = &ni->ni_rates; /* Choose node's lowest basic rate, or else its lowest rate. */ for (ix = 0; ix < rs->rs_nrates; ix++) { if (rs->rs_rates[ix] & IEEE80211_RATE_BASIC) return rs->rs_rates[ix] & IEEE80211_RATE_VAL; } return ni->ni_rates.rs_rates[0] & IEEE80211_RATE_VAL; } return rate & IEEE80211_RATE_VAL; } static struct ieee80211_node * node_alloc(struct ieee80211_node_table *nt) { struct ieee80211_node *ni; ni = malloc(sizeof(struct ieee80211_node), M_80211_NODE, M_NOWAIT | M_ZERO); return ni; } /* * Reclaim any resources in a node and reset any critical * state. Typically nodes are free'd immediately after, * but in some cases the storage may be reused so we need * to insure consistent state (should probably fix that). */ static void node_cleanup(struct ieee80211_node *ni) { #define N(a) (sizeof(a)/sizeof(a[0])) struct ieee80211com *ic = ni->ni_ic; int i, qlen; /* NB: preserve ni_table */ if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) { ic->ic_ps_sta--; ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] power save mode off, %u sta's in ps mode\n", ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta); } /* * Clear AREF flag that marks the authorization refcnt bump * has happened. This is probably not needed as the node * should always be removed from the table so not found but * do it just in case. */ ni->ni_flags &= ~IEEE80211_NODE_AREF; /* * Drain power save queue and, if needed, clear TIM. */ IEEE80211_NODE_SAVEQ_DRAIN(ni, qlen); if (qlen != 0 && ic->ic_set_tim != NULL) ic->ic_set_tim(ni, 0); ni->ni_associd = 0; if (ni->ni_challenge != NULL) { free(ni->ni_challenge, M_DEVBUF); ni->ni_challenge = NULL; } /* * Preserve SSID, WPA, and WME ie's so the bss node is * reusable during a re-auth/re-assoc state transition. * If we remove these data they will not be recreated * because they come from a probe-response or beacon frame * which cannot be expected prior to the association-response. * This should not be an issue when operating in other modes * as stations leaving always go through a full state transition * which will rebuild this state. * * XXX does this leave us open to inheriting old state? */ for (i = 0; i < N(ni->ni_rxfrag); i++) { m_freem(ni->ni_rxfrag[i]); ni->ni_rxfrag[i] = NULL; } /* * Must be careful here to remove any key map entry w/o a LOR. */ ieee80211_node_delucastkey(ni); #undef N } static void node_free(struct ieee80211_node *ni) { struct ieee80211com *ic = ni->ni_ic; ic->ic_node_cleanup(ni); if (ni->ni_wpa_ie != NULL) free(ni->ni_wpa_ie, M_DEVBUF); if (ni->ni_wme_ie != NULL) free(ni->ni_wme_ie, M_DEVBUF); IEEE80211_NODE_SAVEQ_DESTROY(ni); free(ni, M_80211_NODE); } static u_int8_t node_getrssi(const struct ieee80211_node *ni) { return ni->ni_rssi; } static void ieee80211_setup_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni, const u_int8_t *macaddr) { struct ieee80211com *ic = nt->nt_ic; int hash; IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "%s %p<%s> in %s table\n", __func__, ni, ether_sprintf(macaddr), nt->nt_name); IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); hash = IEEE80211_NODE_HASH(macaddr); ieee80211_node_initref(ni); /* mark referenced */ ni->ni_chan = IEEE80211_CHAN_ANYC; ni->ni_authmode = IEEE80211_AUTH_OPEN; ni->ni_txpower = ic->ic_txpowlimit; /* max power */ ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE); ni->ni_inact_reload = nt->nt_inact_init; ni->ni_inact = ni->ni_inact_reload; IEEE80211_NODE_SAVEQ_INIT(ni, "unknown"); IEEE80211_NODE_LOCK(nt); TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list); LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash); ni->ni_table = nt; ni->ni_ic = ic; IEEE80211_NODE_UNLOCK(nt); } struct ieee80211_node * ieee80211_alloc_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) { struct ieee80211com *ic = nt->nt_ic; struct ieee80211_node *ni; ni = ic->ic_node_alloc(nt); if (ni != NULL) ieee80211_setup_node(nt, ni, macaddr); else ic->ic_stats.is_rx_nodealloc++; return ni; } /* * Craft a temporary node suitable for sending a management frame * to the specified station. We craft only as much state as we * need to do the work since the node will be immediately reclaimed * once the send completes. */ struct ieee80211_node * ieee80211_tmp_node(struct ieee80211com *ic, const u_int8_t *macaddr) { struct ieee80211_node *ni; ni = ic->ic_node_alloc(&ic->ic_sta); if (ni != NULL) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr)); IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); ieee80211_node_initref(ni); /* mark referenced */ ni->ni_txpower = ic->ic_bss->ni_txpower; /* NB: required by ieee80211_fix_rate */ ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan); ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE); /* XXX optimize away */ IEEE80211_NODE_SAVEQ_INIT(ni, "unknown"); ni->ni_table = NULL; /* NB: pedantic */ ni->ni_ic = ic; } else { /* XXX msg */ ic->ic_stats.is_rx_nodealloc++; } return ni; } struct ieee80211_node * ieee80211_dup_bss(struct ieee80211_node_table *nt, const u_int8_t *macaddr) { struct ieee80211com *ic = nt->nt_ic; struct ieee80211_node *ni; ni = ic->ic_node_alloc(nt); if (ni != NULL) { ieee80211_setup_node(nt, ni, macaddr); /* * Inherit from ic_bss. */ ni->ni_authmode = ic->ic_bss->ni_authmode; ni->ni_txpower = ic->ic_bss->ni_txpower; ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */ IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan); ni->ni_rsn = ic->ic_bss->ni_rsn; } else { ic->ic_stats.is_rx_nodealloc++; } return ni; } static struct ieee80211_node * #ifdef IEEE80211_DEBUG_REFCNT _ieee80211_find_node_debug(struct ieee80211_node_table *nt, const u_int8_t *macaddr, const char *func, int line) #else _ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) #endif { struct ieee80211_node *ni; int hash; IEEE80211_NODE_LOCK_ASSERT(nt); hash = IEEE80211_NODE_HASH(macaddr); LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) { ieee80211_ref_node(ni); /* mark referenced */ #ifdef IEEE80211_DEBUG_REFCNT IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); #endif return ni; } } return NULL; } #ifdef IEEE80211_DEBUG_REFCNT #define _ieee80211_find_node(nt, mac) \ _ieee80211_find_node_debug(nt, mac, func, line) #endif struct ieee80211_node * #ifdef IEEE80211_DEBUG_REFCNT ieee80211_find_node_debug(struct ieee80211_node_table *nt, const u_int8_t *macaddr, const char *func, int line) #else ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr) #endif { struct ieee80211_node *ni; IEEE80211_NODE_LOCK(nt); ni = _ieee80211_find_node(nt, macaddr); IEEE80211_NODE_UNLOCK(nt); return ni; } /* * Fake up a node; this handles node discovery in adhoc mode. * Note that for the driver's benefit we treat this like * an association so the driver has an opportunity to setup * its private state. */ struct ieee80211_node * ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt, const u_int8_t macaddr[IEEE80211_ADDR_LEN]) { struct ieee80211com *ic = nt->nt_ic; struct ieee80211_node *ni; ni = ieee80211_dup_bss(nt, macaddr); if (ni != NULL) { /* XXX no rate negotiation; just dup */ ni->ni_rates = ic->ic_bss->ni_rates; if (ic->ic_newassoc != NULL) ic->ic_newassoc(ni, 1); /* XXX not right for 802.1x/WPA */ ieee80211_node_authorize(ni); } return ni; } #ifdef IEEE80211_DEBUG static void dump_probe_beacon(u_int8_t subtype, int isnew, const u_int8_t mac[IEEE80211_ADDR_LEN], const struct ieee80211_scanparams *sp) { printf("[%s] %s%s on chan %u (bss chan %u) ", ether_sprintf(mac), isnew ? "new " : "", ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], sp->sp_chan, sp->sp_bchan); ieee80211_print_essid(sp->sp_ssid + 2, sp->sp_ssid[1]); printf("\n"); if (isnew) { printf("[%s] caps 0x%x bintval %u erp 0x%x", ether_sprintf(mac), sp->sp_capinfo, sp->sp_bintval, sp->sp_erp); if (sp->sp_country != NULL) { #ifdef __FreeBSD__ printf(" country info %*D", sp->sp_country[1], sp->sp_country+2, " "); #else int i; printf(" country info"); for (i = 0; i < sp->sp_country[1]; i++) printf(" %02x", sp->sp_country[i+2]); #endif } printf("\n"); } } #endif /* IEEE80211_DEBUG */ static void saveie(u_int8_t **iep, const u_int8_t *ie) { if (ie == NULL) *iep = NULL; else ieee80211_saveie(iep, ie); } /* * Process a beacon or probe response frame. */ void ieee80211_add_scan(struct ieee80211com *ic, const struct ieee80211_scanparams *sp, const struct ieee80211_frame *wh, int subtype, int rssi, int rstamp) { #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) struct ieee80211_node_table *nt = &ic->ic_scan; struct ieee80211_node *ni; int newnode = 0; ni = ieee80211_find_node(nt, wh->i_addr2); if (ni == NULL) { /* * Create a new entry. */ ni = ic->ic_node_alloc(nt); if (ni == NULL) { ic->ic_stats.is_rx_nodealloc++; return; } ieee80211_setup_node(nt, ni, wh->i_addr2); /* * XXX inherit from ic_bss. */ ni->ni_authmode = ic->ic_bss->ni_authmode; ni->ni_txpower = ic->ic_bss->ni_txpower; ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */ ieee80211_set_chan(ic, ni, ic->ic_curchan); ni->ni_rsn = ic->ic_bss->ni_rsn; newnode = 1; } #ifdef IEEE80211_DEBUG if (ieee80211_msg_scan(ic) && (ic->ic_flags & IEEE80211_F_SCAN)) dump_probe_beacon(subtype, newnode, wh->i_addr2, sp); #endif /* XXX ap beaconing multiple ssid w/ same bssid */ if (sp->sp_ssid[1] != 0 && (ISPROBE(subtype) || ni->ni_esslen == 0)) { ni->ni_esslen = sp->sp_ssid[1]; memset(ni->ni_essid, 0, sizeof(ni->ni_essid)); memcpy(ni->ni_essid, sp->sp_ssid + 2, sp->sp_ssid[1]); } ni->ni_scangen = ic->ic_scan.nt_scangen; IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); ni->ni_rssi = rssi; ni->ni_rstamp = rstamp; memcpy(ni->ni_tstamp.data, sp->sp_tstamp, sizeof(ni->ni_tstamp)); ni->ni_intval = sp->sp_bintval; ni->ni_capinfo = sp->sp_capinfo; ni->ni_chan = &ic->ic_channels[sp->sp_chan]; ni->ni_fhdwell = sp->sp_fhdwell; ni->ni_fhindex = sp->sp_fhindex; ni->ni_erp = sp->sp_erp; if (sp->sp_tim != NULL) { struct ieee80211_tim_ie *ie = (struct ieee80211_tim_ie *)sp->sp_tim; ni->ni_dtim_count = ie->tim_count; ni->ni_dtim_period = ie->tim_period; } /* * Record the byte offset from the mac header to * the start of the TIM information element for * use by hardware and/or to speedup software * processing of beacon frames. */ ni->ni_timoff = sp->sp_timoff; /* * Record optional information elements that might be * used by applications or drivers. */ saveie(&ni->ni_wme_ie, sp->sp_wme); saveie(&ni->ni_wpa_ie, sp->sp_wpa); /* NB: must be after ni_chan is setup */ ieee80211_setup_rates(ni, sp->sp_rates, sp->sp_xrates, IEEE80211_R_DOSORT); if (!newnode) ieee80211_free_node(ni); #undef ISPROBE } void ieee80211_init_neighbor(struct ieee80211com *ic, struct ieee80211_node *ni, const struct ieee80211_frame *wh, const struct ieee80211_scanparams *sp, int isnew) { ni->ni_esslen = sp->sp_ssid[1]; memcpy(ni->ni_essid, sp->sp_ssid + 2, sp->sp_ssid[1]); IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); memcpy(ni->ni_tstamp.data, sp->sp_tstamp, sizeof(ni->ni_tstamp)); ni->ni_intval = sp->sp_bintval; ni->ni_capinfo = sp->sp_capinfo; ni->ni_chan = ic->ic_bss->ni_chan; ni->ni_fhdwell = sp->sp_fhdwell; ni->ni_fhindex = sp->sp_fhindex; ni->ni_erp = sp->sp_erp; ni->ni_timoff = sp->sp_timoff; if (sp->sp_wme != NULL) ieee80211_saveie(&ni->ni_wme_ie, sp->sp_wme); if (sp->sp_wpa != NULL) ieee80211_saveie(&ni->ni_wpa_ie, sp->sp_wpa); /* NB: must be after ni_chan is setup */ ieee80211_setup_rates(ni, sp->sp_rates, sp->sp_xrates, IEEE80211_R_DODEL | IEEE80211_R_DONEGO | IEEE80211_R_DOSORT); if (ic->ic_newassoc != NULL) ic->ic_newassoc(ni, isnew); } /* * Do node discovery in adhoc mode on receipt of a beacon * or probe response frame. Note that for the driver's * benefit we treat this like an association so the * driver has an opportunity to setup its private state. */ struct ieee80211_node * ieee80211_add_neighbor(struct ieee80211com *ic, const struct ieee80211_frame *wh, const struct ieee80211_scanparams *sp) { struct ieee80211_node *ni; ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);/* XXX alloc_node? */ if (ni != NULL) { ieee80211_init_neighbor(ic, ni, wh, sp, 1); /* XXX not right for 802.1x/WPA */ ieee80211_node_authorize(ni); } return ni; } #define IS_CTL(wh) \ ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) #define IS_PSPOLL(wh) \ ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) /* * Locate the node for sender, track state, and then pass the * (referenced) node up to the 802.11 layer for its use. We * are required to pass some node so we fall back to ic_bss * when this frame is from an unknown sender. The 802.11 layer * knows this means the sender wasn't in the node table and * acts accordingly. */ struct ieee80211_node * #ifdef IEEE80211_DEBUG_REFCNT ieee80211_find_rxnode_debug(struct ieee80211com *ic, const struct ieee80211_frame_min *wh, const char *func, int line) #else ieee80211_find_rxnode(struct ieee80211com *ic, const struct ieee80211_frame_min *wh) #endif { struct ieee80211_node_table *nt; struct ieee80211_node *ni; /* XXX may want scanned nodes in the neighbor table for adhoc */ if (ic->ic_opmode == IEEE80211_M_STA || ic->ic_opmode == IEEE80211_M_MONITOR || (ic->ic_flags & IEEE80211_F_SCAN)) nt = &ic->ic_scan; else nt = &ic->ic_sta; /* XXX check ic_bss first in station mode */ /* XXX 4-address frames? */ IEEE80211_NODE_LOCK(nt); if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/) ni = _ieee80211_find_node(nt, wh->i_addr1); else ni = _ieee80211_find_node(nt, wh->i_addr2); if (ni == NULL) ni = ieee80211_ref_node(ic->ic_bss); IEEE80211_NODE_UNLOCK(nt); return ni; } /* * Like ieee80211_find_rxnode but use the supplied h/w * key index as a hint to locate the node in the key * mapping table. If an entry is present at the key * index we return it; otherwise do a normal lookup and * update the mapping table if the station has a unicast * key assigned to it. */ struct ieee80211_node * #ifdef IEEE80211_DEBUG_REFCNT ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic, const struct ieee80211_frame_min *wh, ieee80211_keyix keyix, const char *func, int line) #else ieee80211_find_rxnode_withkey(struct ieee80211com *ic, const struct ieee80211_frame_min *wh, ieee80211_keyix keyix) #endif { struct ieee80211_node_table *nt; struct ieee80211_node *ni; if (ic->ic_opmode == IEEE80211_M_STA || ic->ic_opmode == IEEE80211_M_MONITOR || (ic->ic_flags & IEEE80211_F_SCAN)) { nt = &ic->ic_scan; } else { nt = &ic->ic_sta; } IEEE80211_NODE_LOCK(nt); if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) { ni = nt->nt_keyixmap[keyix]; } else { ni = NULL; } if (ni == NULL) { if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/) ni = _ieee80211_find_node(nt, wh->i_addr1); else ni = _ieee80211_find_node(nt, wh->i_addr2); if (ni == NULL) ni = ieee80211_ref_node(ic->ic_bss); if (nt->nt_keyixmap != NULL) { /* * If the station has a unicast key cache slot * assigned update the key->node mapping table. */ keyix = ni->ni_ucastkey.wk_rxkeyix; /* XXX can keyixmap[keyix] != NULL? */ if (keyix < nt->nt_keyixmax && nt->nt_keyixmap[keyix] == NULL) { IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, "%s: add key map entry %p<%s> refcnt %d\n", __func__, ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1); nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni); } } } else { ieee80211_ref_node(ni); } IEEE80211_NODE_UNLOCK(nt); return ni; } #undef IS_PSPOLL #undef IS_CTL /* * Return a reference to the appropriate node for sending * a data frame. This handles node discovery in adhoc networks. */ struct ieee80211_node * #ifdef IEEE80211_DEBUG_REFCNT ieee80211_find_txnode_debug(struct ieee80211com *ic, const u_int8_t *macaddr, const char *func, int line) #else ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) #endif { struct ieee80211_node_table *nt = &ic->ic_sta; struct ieee80211_node *ni; /* * The destination address should be in the node table * unless this is a multicast/broadcast frame. We can * also optimize station mode operation, all frames go * to the bss node. */ /* XXX can't hold lock across dup_bss 'cuz of recursive locking */ IEEE80211_NODE_LOCK(nt); if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr)) ni = ieee80211_ref_node(ic->ic_bss); else ni = _ieee80211_find_node(nt, macaddr); IEEE80211_NODE_UNLOCK(nt); if (ni == NULL) { if (ic->ic_opmode == IEEE80211_M_IBSS || ic->ic_opmode == IEEE80211_M_AHDEMO) { /* * In adhoc mode cons up a node for the destination. * Note that we need an additional reference for the * caller to be consistent with _ieee80211_find_node. */ ni = ieee80211_fakeup_adhoc_node(nt, macaddr); if (ni != NULL) (void)ieee80211_ref_node(ni); } else { IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, "[%s] no node, discard frame (%s)\n", ether_sprintf(macaddr), __func__); ic->ic_stats.is_tx_nonode++; } } return ni; } /* * Like find but search based on the channel too. */ struct ieee80211_node * #ifdef IEEE80211_DEBUG_REFCNT ieee80211_find_node_with_channel_debug(struct ieee80211_node_table *nt, const u_int8_t *macaddr, struct ieee80211_channel *chan, const char *func, int line) #else ieee80211_find_node_with_channel(struct ieee80211_node_table *nt, const u_int8_t *macaddr, struct ieee80211_channel *chan) #endif { struct ieee80211_node *ni; int hash; hash = IEEE80211_NODE_HASH(macaddr); IEEE80211_NODE_LOCK(nt); LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && ni->ni_chan == chan) { ieee80211_ref_node(ni); /* mark referenced */ #ifdef IEEE80211_DEBUG_REFCNT IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); #else IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, "%s %p<%s> refcnt %d\n", __func__, ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); #endif break; } } IEEE80211_NODE_UNLOCK(nt); return ni; } struct ieee80211_node * ieee80211_refine_node_for_beacon(struct ieee80211com *ic, struct ieee80211_node *ni0, struct ieee80211_channel *chan, const u_int8_t *ssid) { struct ieee80211_node_table *nt = ni0->ni_table; struct ieee80211_node *best, *ni; int best_score = 0, score; if (nt == NULL) return ni0; best = ni0; if (ssid[1] == 0 || best->ni_esslen == 0) best_score = 1; else if (ssid[1] == best->ni_esslen && memcmp(ssid + 2, best->ni_essid, ssid[1]) == 0) best_score = 2; else best_score = 0; IEEE80211_NODE_LOCK(nt); for (ni = LIST_NEXT(ni0, ni_hash); ni != NULL; ni = LIST_NEXT(ni, ni_hash)) { if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, best->ni_macaddr) || ni->ni_ic != best->ni_ic || ni->ni_chan != chan) continue; if (ssid[1] == 0 || ni->ni_esslen == 0) score = 1; else if (ssid[1] == ni->ni_esslen && memcmp(ssid + 2, ni->ni_essid, ssid[1]) == 0) score = 2; else continue; if (score > best_score) { best = ni; best_score = score; } } IEEE80211_NODE_UNLOCK(nt); return best; } /* * Like find but search based on the ssid too. */ struct ieee80211_node * #ifdef IEEE80211_DEBUG_REFCNT ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt, const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid, const char *func, int line) #else ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt, const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid) #endif { #define MATCH_SSID(ni, ssid, ssidlen) \ (ni->ni_esslen == ssidlen && memcmp(ni->ni_essid, ssid, ssidlen) == 0) static const u_int8_t zeromac[IEEE80211_ADDR_LEN]; struct ieee80211com *ic = nt->nt_ic; struct ieee80211_node *ni; int hash; IEEE80211_NODE_LOCK(nt); __USE(ic); /* * A mac address that is all zero means match only the ssid; * otherwise we must match both. */ if (IEEE80211_ADDR_EQ(macaddr, zeromac)) { TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { if (MATCH_SSID(ni, ssid, ssidlen)) break; } } else { hash = IEEE80211_NODE_HASH(macaddr); LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) { if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) && MATCH_SSID(ni, ssid, ssidlen)) break; } } if (ni != NULL) { ieee80211_ref_node(ni); /* mark referenced */ #ifdef IEEE80211_DEBUG_REFCNT IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); #else IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "%s %p<%s> refcnt %d\n", __func__, ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); #endif } IEEE80211_NODE_UNLOCK(nt); return ni; #undef MATCH_SSID } static void _ieee80211_free_node(struct ieee80211_node *ni) { struct ieee80211com *ic = ni->ni_ic; struct ieee80211_node_table *nt = ni->ni_table; IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "%s %p<%s> in %s table\n", __func__, ni, ether_sprintf(ni->ni_macaddr), nt != NULL ? nt->nt_name : ""); IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); if (nt != NULL) { TAILQ_REMOVE(&nt->nt_node, ni, ni_list); LIST_REMOVE(ni, ni_hash); } ic->ic_node_free(ni); } void #ifdef IEEE80211_DEBUG_REFCNT ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line) #else ieee80211_free_node(struct ieee80211_node *ni) #endif { struct ieee80211_node_table *nt = ni->ni_table; #ifdef IEEE80211_DEBUG_REFCNT IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1); #endif if (nt != NULL) { IEEE80211_NODE_LOCK(nt); if (ieee80211_node_dectestref(ni)) { /* * Last reference, reclaim state. */ _ieee80211_free_node(ni); } else if (ieee80211_node_refcnt(ni) == 1 && nt->nt_keyixmap != NULL) { ieee80211_keyix keyix; /* * Check for a last reference in the key mapping table. */ keyix = ni->ni_ucastkey.wk_rxkeyix; if (keyix < nt->nt_keyixmax && nt->nt_keyixmap[keyix] == ni) { IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, "%s: %p<%s> clear key map entry", __func__, ni, ether_sprintf(ni->ni_macaddr)); nt->nt_keyixmap[keyix] = NULL; ieee80211_node_decref(ni); /* XXX needed? */ _ieee80211_free_node(ni); } } IEEE80211_NODE_UNLOCK(nt); } else { if (ieee80211_node_dectestref(ni)) _ieee80211_free_node(ni); } } /* * Reclaim a unicast key and clear any key cache state. */ int ieee80211_node_delucastkey(struct ieee80211_node *ni) { struct ieee80211com *ic = ni->ni_ic; struct ieee80211_node_table *nt = &ic->ic_sta; struct ieee80211_node *nikey; ieee80211_keyix keyix; int isowned, status; /* * NB: We must beware of LOR here; deleting the key * can cause the crypto layer to block traffic updates * which can generate a LOR against the node table lock; * grab it here and stash the key index for our use below. * * Must also beware of recursion on the node table lock. * When called from node_cleanup we may already have * the node table lock held. Unfortunately there's no * way to separate out this path so we must do this * conditionally. */ isowned = IEEE80211_NODE_IS_LOCKED(nt); if (!isowned) IEEE80211_NODE_LOCK(nt); keyix = ni->ni_ucastkey.wk_rxkeyix; status = ieee80211_crypto_delkey(ic, &ni->ni_ucastkey); if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) { nikey = nt->nt_keyixmap[keyix]; nt->nt_keyixmap[keyix] = NULL; } else nikey = NULL; if (!isowned) IEEE80211_NODE_UNLOCK(&ic->ic_sta); if (nikey != NULL) { IASSERT(nikey == ni, ("key map out of sync, ni %p nikey %p", ni, nikey)); IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, "%s: delete key map entry %p<%s> refcnt %d\n", __func__, ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1); ieee80211_free_node(ni); } return status; } /* * Reclaim a node. If this is the last reference count then * do the normal free work. Otherwise remove it from the node * table and mark it gone by clearing the back-reference. */ static void node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni) { ieee80211_keyix keyix; IEEE80211_NODE_LOCK_ASSERT(nt); IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, "%s: remove %p<%s> from %s table, refcnt %d\n", __func__, ni, ether_sprintf(ni->ni_macaddr), nt->nt_name, ieee80211_node_refcnt(ni)-1); /* * Clear any entry in the unicast key mapping table. * We need to do it here so rx lookups don't find it * in the mapping table even if it's not in the hash * table. We cannot depend on the mapping table entry * being cleared because the node may not be free'd. */ keyix = ni->ni_ucastkey.wk_rxkeyix; if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax && nt->nt_keyixmap[keyix] == ni) { IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE, "%s: %p<%s> clear key map entry\n", __func__, ni, ether_sprintf(ni->ni_macaddr)); nt->nt_keyixmap[keyix] = NULL; ieee80211_node_decref(ni); /* NB: don't need free */ } if (!ieee80211_node_dectestref(ni)) { /* * Other references are present, just remove the * node from the table so it cannot be found. When * the references are dropped storage will be * reclaimed. */ TAILQ_REMOVE(&nt->nt_node, ni, ni_list); LIST_REMOVE(ni, ni_hash); ni->ni_table = NULL; /* clear reference */ } else _ieee80211_free_node(ni); } static void ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt) { struct ieee80211com *ic = nt->nt_ic; struct ieee80211_node *ni; IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "%s: free all nodes in %s table\n", __func__, nt->nt_name); while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) { if (ni->ni_associd != 0) { if (ic->ic_auth->ia_node_leave != NULL) ic->ic_auth->ia_node_leave(ic, ni); IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); } node_reclaim(nt, ni); } ieee80211_reset_erp(ic); } static void ieee80211_free_allnodes(struct ieee80211_node_table *nt) { IEEE80211_NODE_LOCK(nt); ieee80211_free_allnodes_locked(nt); IEEE80211_NODE_UNLOCK(nt); } /* * Timeout entries in the scan cache. */ static void ieee80211_timeout_scan_candidates(struct ieee80211_node_table *nt) { struct ieee80211com *ic = nt->nt_ic; struct ieee80211_node *ni, *tni; IEEE80211_NODE_LOCK(nt); ni = ic->ic_bss; /* XXX belongs elsewhere */ if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) { m_freem(ni->ni_rxfrag[0]); ni->ni_rxfrag[0] = NULL; } TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, tni) { if (ni->ni_inact && --ni->ni_inact == 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "[%s] scan candidate purged from cache " "(refcnt %u)\n", ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); node_reclaim(nt, ni); } } IEEE80211_NODE_UNLOCK(nt); nt->nt_inact_timer = IEEE80211_INACT_WAIT; } /* * Timeout inactive stations and do related housekeeping. * Note that we cannot hold the node lock while sending a * frame as this would lead to a LOR. Instead we use a * generation number to mark nodes that we've scanned and * drop the lock and restart a scan if we have to time out * a node. Since we are single-threaded by virtue of * controlling the inactivity timer we can be sure this will * process each node only once. */ static void ieee80211_timeout_stations(struct ieee80211_node_table *nt) { struct ieee80211com *ic = nt->nt_ic; struct ieee80211_node *ni; u_int gen; int isadhoc; isadhoc = (ic->ic_opmode == IEEE80211_M_IBSS || ic->ic_opmode == IEEE80211_M_AHDEMO); IEEE80211_SCAN_LOCK(nt); gen = ++nt->nt_scangen; IEEE80211_SCAN_UNLOCK(nt); IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "%s: %s scangen %u\n", __func__, nt->nt_name, gen); restart: IEEE80211_SCAN_LOCK(nt); if (gen != nt->nt_scangen) { printf("%s: scan aborted %u\n", __func__, gen); IEEE80211_SCAN_UNLOCK(nt); return; } IEEE80211_SCAN_UNLOCK(nt); IEEE80211_NODE_LOCK(nt); TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { if (ni->ni_scangen == gen) /* previously handled */ continue; ni->ni_scangen = gen; /* * Ignore entries for which have yet to receive an * authentication frame. These are transient and * will be reclaimed when the last reference to them * goes away (when frame xmits complete). */ if (ic->ic_opmode == IEEE80211_M_HOSTAP && (ni->ni_flags & IEEE80211_NODE_AREF) == 0) continue; /* * Free fragment if not needed anymore * (last fragment older than 1s). * XXX doesn't belong here */ if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) { m_freem(ni->ni_rxfrag[0]); ni->ni_rxfrag[0] = NULL; } /* * Special case ourself; we may be idle for extended periods * of time and regardless reclaiming our state is wrong. */ if (ni == ic->ic_bss) continue; ni->ni_inact--; if (ni->ni_associd != 0 || isadhoc) { /* * Age frames on the power save queue. The * aging interval is 4 times the listen * interval specified by the station. This * number is factored into the age calculations * when the frame is placed on the queue. We * store ages as time differences we can check * and/or adjust only the head of the list. */ if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) { struct mbuf *m; int discard = 0; IEEE80211_NODE_SAVEQ_LOCK(ni); while (IF_POLL(&ni->ni_savedq, m) != NULL && M_AGE_GET(m) < IEEE80211_INACT_WAIT) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/ _IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m); m_freem(m); discard++; } if (m != NULL) M_AGE_SUB(m, IEEE80211_INACT_WAIT); IEEE80211_NODE_SAVEQ_UNLOCK(ni); if (discard != 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] discard %u frames for age\n", ether_sprintf(ni->ni_macaddr), discard); IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard); if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) ic->ic_set_tim(ni, 0); } } /* * Probe the station before time it out. We * send a null data frame which may not be * universally supported by drivers (need it * for ps-poll support so it should be...). */ if (0 < ni->ni_inact && ni->ni_inact <= ic->ic_inact_probe) { IEEE80211_NOTE(ic, IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni, "%s", "probe station due to inactivity"); /* * Grab a reference before unlocking the table * so the node cannot be reclaimed before we * send the frame. ieee80211_send_nulldata * understands we've done this and reclaims the * ref for us as needed. */ ieee80211_ref_node(ni); IEEE80211_NODE_UNLOCK(nt); ieee80211_send_nulldata(ni); /* XXX stat? */ goto restart; } } if (ni->ni_inact <= 0) { IEEE80211_NOTE(ic, IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni, "station timed out due to inactivity " "(refcnt %u)", ieee80211_node_refcnt(ni)); /* * Send a deauthenticate frame and drop the station. * This is somewhat complicated due to reference counts * and locking. At this point a station will typically * have a reference count of 1. ieee80211_node_leave * will do a "free" of the node which will drop the * reference count. But in the meantime a reference * will be held by the deauth frame. The actual reclaim * of the node will happen either after the tx is * completed or by ieee80211_node_leave. * * Separately we must drop the node lock before sending * in case the driver takes a lock, as this will result * in LOR between the node lock and the driver lock. */ IEEE80211_NODE_UNLOCK(nt); if (ni->ni_associd != 0) { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_AUTH_EXPIRE); } ieee80211_node_leave(ic, ni); ic->ic_stats.is_node_timeout++; goto restart; } } IEEE80211_NODE_UNLOCK(nt); nt->nt_inact_timer = IEEE80211_INACT_WAIT; } void ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg) { struct ieee80211_node *ni; u_int gen; IEEE80211_SCAN_LOCK(nt); gen = ++nt->nt_scangen; IEEE80211_SCAN_UNLOCK(nt); restart: IEEE80211_SCAN_LOCK(nt); if (gen != nt->nt_scangen) { printf("%s: scan aborted %u\n", __func__, gen); IEEE80211_SCAN_UNLOCK(nt); return; } IEEE80211_SCAN_UNLOCK(nt); IEEE80211_NODE_LOCK(nt); TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { if (ni->ni_scangen != gen) { ni->ni_scangen = gen; (void) ieee80211_ref_node(ni); IEEE80211_NODE_UNLOCK(nt); (*f)(arg, ni); ieee80211_free_node(ni); goto restart; } } IEEE80211_NODE_UNLOCK(nt); } void ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni) { printf("%p: mac %s refcnt %d\n", ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); printf("\tscangen %u authmode %u flags 0x%x\n", ni->ni_scangen, ni->ni_authmode, ni->ni_flags); printf("\tassocid 0x%x txpower %u vlan %u\n", ni->ni_associd, ni->ni_txpower, ni->ni_vlan); printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n", ni->ni_txseqs[0], ni->ni_rxseqs[0] >> IEEE80211_SEQ_SEQ_SHIFT, ni->ni_rxseqs[0] & IEEE80211_SEQ_FRAG_MASK, ni->ni_rxfragstamp); printf("\trstamp %u rssi %u intval %u capinfo 0x%x\n", ni->ni_rstamp, ni->ni_rssi, ni->ni_intval, ni->ni_capinfo); printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n", ether_sprintf(ni->ni_bssid), ni->ni_esslen, ni->ni_essid, ni->ni_chan->ic_freq, ni->ni_chan->ic_flags); printf("\tfails %u inact %u txrate %u\n", ni->ni_fails, ni->ni_inact, ni->ni_txrate); } void ieee80211_dump_nodes(struct ieee80211_node_table *nt) { ieee80211_iterate_nodes(nt, (ieee80211_iter_func *) ieee80211_dump_node, nt); } /* * Handle a station joining an 11g network. */ static void ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) { /* * Station isn't capable of short slot time. Bump * the count of long slot time stations and disable * use of short slot time. Note that the actual switch * over to long slot time use may not occur until the * next beacon transmission (per sec. 7.3.1.4 of 11g). */ if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { ic->ic_longslotsta++; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] station needs long slot time, count %d\n", ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); /* XXX vap's w/ conflicting needs won't work */ ieee80211_set_shortslottime(ic, 0); } /* * If the new station is not an ERP station * then bump the counter and enable protection * if configured. */ if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) { ic->ic_nonerpsta++; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] station is !ERP, %d non-ERP stations associated\n", ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); /* * If protection is configured, enable it. */ if (ic->ic_protmode != IEEE80211_PROT_NONE) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "%s: enable use of protection\n", __func__); ic->ic_flags |= IEEE80211_F_USEPROT; } /* * If station does not support short preamble * then we must enable use of Barker preamble. */ if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] station needs long preamble\n", ether_sprintf(ni->ni_macaddr)); ic->ic_flags |= IEEE80211_F_USEBARKER; ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; } } else { ni->ni_flags |= IEEE80211_NODE_ERP; } } void ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp) { int newassoc; if (ni->ni_associd == 0) { u_int16_t aid; /* * It would be good to search the bitmap * more efficiently, but this will do for now. */ for (aid = 1; aid < ic->ic_max_aid; aid++) { if (!IEEE80211_AID_ISSET(aid, ic->ic_aid_bitmap)) break; } if (aid >= ic->ic_max_aid) { IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_REASON_ASSOC_TOOMANY); ieee80211_node_leave(ic, ni); return; } ni->ni_associd = aid | 0xc000; IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap); ic->ic_sta_assoc++; newassoc = 1; if (ic->ic_curmode == IEEE80211_MODE_11G) ieee80211_node_join_11g(ic, ni); } else newassoc = 0; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, "[%s] station %sassociated at aid %d: %s preamble, %s slot time%s%s\n", ether_sprintf(ni->ni_macaddr), newassoc ? "" : "re", IEEE80211_NODE_AID(ni), ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long", ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long", ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "", ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "" ); /* give driver a chance to setup state like ni_txrate */ if (ic->ic_newassoc != NULL) ic->ic_newassoc(ni, newassoc); ni->ni_inact_reload = ic->ic_inact_auth; ni->ni_inact = ni->ni_inact_reload; IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); /* tell the authenticator about new station */ if (ic->ic_auth->ia_node_join != NULL) ic->ic_auth->ia_node_join(ic, ni); ieee80211_notify_node_join(ic, ni, newassoc); } /* * Handle a station leaving an 11g network. */ static void ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) { IASSERT(ic->ic_curmode == IEEE80211_MODE_11G, ("not in 11g, bss %u:0x%x, curmode %u", ni->ni_chan->ic_freq, ni->ni_chan->ic_flags, ic->ic_curmode)); /* * If a long slot station do the slot time bookkeeping. */ if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { IASSERT(ic->ic_longslotsta > 0, ("bogus long slot station count %d", ic->ic_longslotsta)); ic->ic_longslotsta--; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] long slot time station leaves, count now %d\n", ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta); if (ic->ic_longslotsta == 0) { /* * Re-enable use of short slot time if supported * and not operating in IBSS mode (per spec). */ if ((ic->ic_caps & IEEE80211_C_SHSLOT) && ic->ic_opmode != IEEE80211_M_IBSS) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "%s: re-enable use of short slot time\n", __func__); ieee80211_set_shortslottime(ic, 1); } } } /* * If a non-ERP station do the protection-related bookkeeping. */ if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) { IASSERT(ic->ic_nonerpsta > 0, ("bogus non-ERP station count %d", ic->ic_nonerpsta)); ic->ic_nonerpsta--; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] non-ERP station leaves, count now %d\n", ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta); if (ic->ic_nonerpsta == 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "%s: disable use of protection\n", __func__); ic->ic_flags &= ~IEEE80211_F_USEPROT; /* XXX verify mode? */ if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "%s: re-enable use of short preamble\n", __func__); ic->ic_flags |= IEEE80211_F_SHPREAMBLE; ic->ic_flags &= ~IEEE80211_F_USEBARKER; } } } } /* * Handle bookkeeping for station deauthentication/disassociation * when operating as an ap. */ void ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) { struct ieee80211_node_table *nt = ni->ni_table; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, "[%s] station with aid %d leaves\n", ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_AID(ni)); IASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || ic->ic_opmode == IEEE80211_M_IBSS || ic->ic_opmode == IEEE80211_M_AHDEMO, ("unexpected operating mode %u", ic->ic_opmode)); /* * If node wasn't previously associated all * we need to do is reclaim the reference. */ /* XXX ibss mode bypasses 11g and notification */ if (ni->ni_associd == 0) goto done; /* * Tell the authenticator the station is leaving. * Note that we must do this before yanking the * association id as the authenticator uses the * associd to locate its state block. */ if (ic->ic_auth->ia_node_leave != NULL) ic->ic_auth->ia_node_leave(ic, ni); IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); ni->ni_associd = 0; ic->ic_sta_assoc--; if (ic->ic_curmode == IEEE80211_MODE_11G) ieee80211_node_leave_11g(ic, ni); /* * Cleanup station state. In particular clear various * state that might otherwise be reused if the node * is reused before the reference count goes to zero * (and memory is reclaimed). */ ieee80211_sta_leave(ic, ni); done: /* * Remove the node from any table it's recorded in and * drop the caller's reference. Removal from the table * is important to insure the node is not reprocessed * for inactivity. */ if (nt != NULL) { IEEE80211_NODE_LOCK(nt); node_reclaim(nt, ni); IEEE80211_NODE_UNLOCK(nt); } else ieee80211_free_node(ni); } u_int8_t ieee80211_getrssi(struct ieee80211com *ic) { #define NZ(x) ((x) == 0 ? 1 : (x)) struct ieee80211_node_table *nt = &ic->ic_sta; u_int32_t rssi_samples, rssi_total; struct ieee80211_node *ni; rssi_total = 0; rssi_samples = 0; switch (ic->ic_opmode) { case IEEE80211_M_IBSS: /* average of all ibss neighbors */ /* XXX locking */ TAILQ_FOREACH(ni, &nt->nt_node, ni_list) if (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) { rssi_samples++; rssi_total += ic->ic_node_getrssi(ni); } break; case IEEE80211_M_AHDEMO: /* average of all neighbors */ /* XXX locking */ TAILQ_FOREACH(ni, &nt->nt_node, ni_list) { rssi_samples++; rssi_total += ic->ic_node_getrssi(ni); } break; case IEEE80211_M_HOSTAP: /* average of all associated stations */ #ifndef IEEE80211_NO_HOSTAP /* XXX locking */ TAILQ_FOREACH(ni, &nt->nt_node, ni_list) if (IEEE80211_AID(ni->ni_associd) != 0) { rssi_samples++; rssi_total += ic->ic_node_getrssi(ni); } #endif /* !IEEE80211_NO_HOSTAP */ break; case IEEE80211_M_MONITOR: /* XXX */ case IEEE80211_M_STA: /* use stats from associated ap */ default: if (ic->ic_bss != NULL) rssi_total = ic->ic_node_getrssi(ic->ic_bss); rssi_samples = 1; break; } return rssi_total / NZ(rssi_samples); #undef NZ } /* * Indicate whether there are frames queued for a station in power-save mode. */ static void ieee80211_set_tim(struct ieee80211_node *ni, int set) { struct ieee80211com *ic = ni->ni_ic; u_int16_t aid; IASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP || ic->ic_opmode == IEEE80211_M_IBSS, ("operating mode %u", ic->ic_opmode)); aid = IEEE80211_AID(ni->ni_associd); IASSERT(aid < ic->ic_max_aid, ("bogus aid %u, max %u", aid, ic->ic_max_aid)); IEEE80211_BEACON_LOCK(ic); if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) { if (set) { setbit(ic->ic_tim_bitmap, aid); ic->ic_ps_pending++; } else { clrbit(ic->ic_tim_bitmap, aid); ic->ic_ps_pending--; } ic->ic_flags |= IEEE80211_F_TIMUPDATE; } IEEE80211_BEACON_UNLOCK(ic); } /* * Node table support. */ static void ieee80211_node_table_init(struct ieee80211com *ic, struct ieee80211_node_table *nt, const char *name, int inact, int keyixmax, void (*timeout)(struct ieee80211_node_table *)) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "%s %s table, inact %u\n", __func__, name, inact); nt->nt_ic = ic; /* XXX need unit */ IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname); IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname); TAILQ_INIT(&nt->nt_node); nt->nt_name = name; nt->nt_scangen = 1; nt->nt_inact_init = inact; nt->nt_timeout = timeout; nt->nt_keyixmax = keyixmax; if (nt->nt_keyixmax > 0) { nt->nt_keyixmap = malloc(keyixmax * sizeof(struct ieee80211_node *), M_80211_NODE, M_WAITOK | M_ZERO); } else nt->nt_keyixmap = NULL; } void ieee80211_node_table_reset(struct ieee80211_node_table *nt) { IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, "%s %s table\n", __func__, nt->nt_name); IEEE80211_NODE_LOCK(nt); nt->nt_inact_timer = 0; ieee80211_free_allnodes_locked(nt); IEEE80211_NODE_UNLOCK(nt); } static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt) { IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, "%s %s table\n", __func__, nt->nt_name); IEEE80211_NODE_LOCK(nt); ieee80211_free_allnodes_locked(nt); IEEE80211_NODE_UNLOCK(nt); if (nt->nt_keyixmap != NULL) { /* XXX verify all entries are NULL */ int i; for (i = 0; i < nt->nt_keyixmax; i++) if (nt->nt_keyixmap[i] != NULL) printf("%s: %s[%u] still active\n", __func__, nt->nt_name, i); free(nt->nt_keyixmap, M_80211_NODE); nt->nt_keyixmap = NULL; } IEEE80211_SCAN_LOCK_DESTROY(nt); IEEE80211_NODE_LOCK_DESTROY(nt); }