/*- * 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("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include /* * 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))) #ifdef IEEE80211_DEBUG_REFCNT #define REFCNT_LOC "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line #else #define REFCNT_LOC "%s %p<%s> refcnt %d\n", __func__ #endif static int ieee80211_sta_join1(struct ieee80211_node *); 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 int8_t node_getrssi(const struct ieee80211_node *); static void node_getsignal(const struct ieee80211_node *, int8_t *, int8_t *); static void ieee80211_setup_node(struct ieee80211_node_table *, struct ieee80211_node *, const uint8_t *); static void _ieee80211_free_node(struct ieee80211_node *); static void ieee80211_node_table_init(struct ieee80211com *ic, struct ieee80211_node_table *nt, const char *name, int inact, int keymaxix); static void ieee80211_node_table_reset(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; ic->ic_node_getsignal = node_getsignal; /* default station inactivity timer setings */ 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; callout_init(&ic->ic_inact, CALLOUT_MPSAFE); /* NB: driver should override */ ic->ic_max_aid = IEEE80211_AID_DEF; } 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; MALLOC(ic->ic_aid_bitmap, uint32_t *, howmany(ic->ic_max_aid, 32) * sizeof(uint32_t), M_80211_NODE, M_NOWAIT | M_ZERO); if (ic->ic_aid_bitmap == NULL) { /* XXX no way to recover */ printf("%s: no memory for AID bitmap!\n", __func__); ic->ic_max_aid = 0; } ieee80211_node_table_init(ic, &ic->ic_sta, "station", IEEE80211_INACT_INIT, ic->ic_crypto.cs_max_keyix); 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_sta); if (ic->ic_aid_bitmap != NULL) { FREE(ic->ic_aid_bitmap, M_80211_NODE); ic->ic_aid_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_node_set_chan(struct ieee80211com *ic, struct ieee80211_node *ni) { struct ieee80211_channel *chan = ic->ic_bsschan; #if 0 KASSERT(chan != IEEE80211_CHAN_ANYC, ("bss channel not setup")); #else if (chan == IEEE80211_CHAN_ANYC) /* XXX while scanning */ chan = ic->ic_curchan; #endif ni->ni_chan = chan; if (IEEE80211_IS_CHAN_HT(chan)) { /* * XXX Gotta be careful here; the rate set returned by * ieee80211_get_suprates is actually any HT rate * set so blindly copying it will be bad. We must * install the legacy rate est in ni_rates and the * HT rate set in ni_htrates. */ ni->ni_htrates = *ieee80211_get_suphtrates(ic, chan); } ni->ni_rates = *ieee80211_get_suprates(ic, chan); } /* * Probe the curent 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_ssid[0].ssid, ic->ic_des_ssid[0].len, 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_ssid[0].len; memcpy(ni->ni_essid, ic->ic_des_ssid[0].ssid, ni->ni_esslen); if (ic->ic_bss != NULL) 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 { get_random_bytes(ni->ni_bssid, IEEE80211_ADDR_LEN); /* clear group bit, add local bit */ ni->ni_bssid[0] = (ni->ni_bssid[0] &~ 0x01) | 0x02; } } else if (ic->ic_opmode == IEEE80211_M_AHDEMO) { if (ic->ic_flags & IEEE80211_F_DESBSSID) IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid); else memset(ni->ni_bssid, 0, IEEE80211_ADDR_LEN); } /* * Fix the channel and related attributes. */ ic->ic_bsschan = chan; ieee80211_node_set_chan(ic, ni); ic->ic_curmode = ieee80211_chan2mode(chan); /* * Do mode-specific rate setup. */ if (IEEE80211_IS_CHAN_FULL(chan)) { if (IEEE80211_IS_CHAN_ANYG(chan)) { /* * Use a mixed 11b/11g rate set. */ ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11G); } else if (IEEE80211_IS_CHAN_B(chan)) { /* * Force pure 11b rate set. */ ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11B); } } (void) ieee80211_sta_join1(ieee80211_ref_node(ni)); } /* * Reset bss state on transition to the INIT state. * Clear any stations from the table (they have been * deauth'd) and reset the bss node (clears key, rate * etc. state). */ void ieee80211_reset_bss(struct ieee80211com *ic) { struct ieee80211_node *ni, *obss; callout_drain(&ic->ic_inact); ieee80211_node_table_reset(&ic->ic_sta); ieee80211_reset_erp(ic); ni = ieee80211_alloc_node(&ic->ic_sta, ic->ic_myaddr); KASSERT(ni != NULL, ("unable to setup inital 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); } } static int match_ssid(const struct ieee80211_node *ni, int nssid, const struct ieee80211_scan_ssid ssids[]) { int i; for (i = 0; i < nssid; i++) { if (ni->ni_esslen == ssids[i].len && memcmp(ni->ni_essid, ssids[i].ssid, ni->ni_esslen) == 0) return 1; } return 0; } /* * Test a node for suitability/compatibility. */ static int check_bss(struct ieee80211com *ic, struct ieee80211_node *ni) { uint8_t rate; if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) return 0; if (ic->ic_opmode == IEEE80211_M_IBSS) { if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) return 0; } else { if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) return 0; } if (ic->ic_flags & IEEE80211_F_PRIVACY) { if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) return 0; } else { /* XXX does this mean privacy is supported or required? */ if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) return 0; } rate = ieee80211_fix_rate(ni, &ni->ni_rates, IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE); if (rate & IEEE80211_RATE_BASIC) return 0; if (ic->ic_des_nssid != 0 && !match_ssid(ni, ic->ic_des_nssid, ic->ic_des_ssid)) return 0; if ((ic->ic_flags & IEEE80211_F_DESBSSID) && !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) return 0; return 1; } #ifdef IEEE80211_DEBUG /* * Display node suitability/compatibility. */ static void check_bss_debug(struct ieee80211com *ic, struct ieee80211_node *ni) { uint8_t rate; int fail; fail = 0; if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_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, &ni->ni_rates, IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE); if (rate & IEEE80211_RATE_BASIC) fail |= 0x08; if (ic->ic_des_nssid != 0 && !match_ssid(ni, ic->ic_des_nssid, ic->ic_des_ssid)) fail |= 0x10; if ((ic->ic_flags & IEEE80211_F_DESBSSID) && !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) fail |= 0x20; printf(" %c %s", 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 /* IEEE80211_DEBUG */ /* * 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 (!check_bss(ic, ni)) { /* capabilities mismatch */ IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "%s: merge failed, capabilities mismatch\n", __func__); #ifdef IEEE80211_DEBUG if (ieee80211_msg_assoc(ic)) check_bss_debug(ic, ni); #endif ic->ic_stats.is_ibss_capmismatch++; 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" : "" ); return ieee80211_sta_join1(ieee80211_ref_node(ni)); } /* * Join the specified IBSS/BSS network. The node is assumed to * be passed in with a held reference. */ static int ieee80211_sta_join1(struct ieee80211_node *selbs) { struct ieee80211com *ic = selbs->ni_ic; struct ieee80211_node *obss; int canreassoc; if (ic->ic_opmode == IEEE80211_M_IBSS) { struct ieee80211_node_table *nt; /* * Fillin 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; /* * Check if old+new node have the same address in which * case we can reassociate when operating in sta mode. */ canreassoc = (obss != NULL && ic->ic_state == IEEE80211_S_RUN && IEEE80211_ADDR_EQ(obss->ni_macaddr, selbs->ni_macaddr)); ic->ic_bss = selbs; /* NB: caller assumed to bump refcnt */ if (obss != NULL) { copy_bss(selbs, obss); ieee80211_free_node(obss); } /* * Delete unusable rates; we've already checked * that the negotiated rate set is acceptable. */ ieee80211_fix_rate(ic->ic_bss, &ic->ic_bss->ni_rates, IEEE80211_F_DODEL | IEEE80211_F_JOIN); ic->ic_bsschan = selbs->ni_chan; ic->ic_curchan = ic->ic_bsschan; ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan); ic->ic_set_channel(ic); /* * Set the erp state (mostly the slot time) to deal with * the auto-select case; this should be redundant if the * mode is locked. */ ieee80211_reset_erp(ic); ieee80211_wme_initparams(ic); if (ic->ic_opmode == IEEE80211_M_STA) { if (canreassoc) { /* Reassociate */ ieee80211_new_state(ic, IEEE80211_S_ASSOC, 1); } else { /* * Act as if we received a DEAUTH frame in case we * are invoked from the RUN state. This will cause * us to try to re-authenticate if we are operating * as a station. */ ieee80211_new_state(ic, IEEE80211_S_AUTH, IEEE80211_FC0_SUBTYPE_DEAUTH); } } else ieee80211_new_state(ic, IEEE80211_S_RUN, -1); return 1; } int ieee80211_sta_join(struct ieee80211com *ic, const struct ieee80211_scan_entry *se) { struct ieee80211_node *ni; ni = ieee80211_alloc_node(&ic->ic_sta, se->se_macaddr); if (ni == NULL) { /* XXX msg */ return 0; } /* * Expand scan state into node's format. * XXX may not need all this stuff */ IEEE80211_ADDR_COPY(ni->ni_bssid, se->se_bssid); ni->ni_esslen = se->se_ssid[1]; memcpy(ni->ni_essid, se->se_ssid+2, ni->ni_esslen); ni->ni_rstamp = se->se_rstamp; ni->ni_tstamp.tsf = se->se_tstamp.tsf; ni->ni_intval = se->se_intval; ni->ni_capinfo = se->se_capinfo; /* XXX shift to 11n channel if htinfo present */ ni->ni_chan = se->se_chan; ni->ni_timoff = se->se_timoff; ni->ni_fhdwell = se->se_fhdwell; ni->ni_fhindex = se->se_fhindex; ni->ni_erp = se->se_erp; ni->ni_rssi = se->se_rssi; ni->ni_noise = se->se_noise; if (se->se_htcap_ie != NULL) ieee80211_ht_node_init(ni, se->se_htcap_ie); if (se->se_htinfo_ie != NULL) ieee80211_parse_htinfo(ni, se->se_htinfo_ie); if (se->se_wpa_ie != NULL) ieee80211_saveie(&ni->ni_wpa_ie, se->se_wpa_ie); if (se->se_rsn_ie != NULL) ieee80211_saveie(&ni->ni_rsn_ie, se->se_rsn_ie); if (se->se_wme_ie != NULL) ieee80211_saveie(&ni->ni_wme_ie, se->se_wme_ie); if (se->se_ath_ie != NULL) ieee80211_saveath(ni, se->se_ath_ie); ic->ic_dtim_period = se->se_dtimperiod; ic->ic_dtim_count = 0; /* NB: must be after ni_chan is setup */ ieee80211_setup_rates(ni, se->se_rates, se->se_xrates, IEEE80211_F_DOSORT); if (se->se_htcap_ie != NULL) ieee80211_setup_htrates(ni, se->se_htcap_ie, IEEE80211_F_JOIN); if (se->se_htinfo_ie != NULL) ieee80211_setup_basic_htrates(ni, se->se_htinfo_ie); return ieee80211_sta_join1(ieee80211_ref_node(ni)); } /* * 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); } static struct ieee80211_node * node_alloc(struct ieee80211_node_table *nt) { struct ieee80211_node *ni; MALLOC(ni, struct ieee80211_node *, 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; /* 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. */ if (ieee80211_node_saveq_drain(ni) != 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_80211_NODE); 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++) if (ni->ni_rxfrag[i] != NULL) { 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_80211_NODE); if (ni->ni_rsn_ie != NULL) FREE(ni->ni_rsn_ie, M_80211_NODE); if (ni->ni_wme_ie != NULL) FREE(ni->ni_wme_ie, M_80211_NODE); if (ni->ni_ath_ie != NULL) FREE(ni->ni_ath_ie, M_80211_NODE); IEEE80211_NODE_SAVEQ_DESTROY(ni); FREE(ni, M_80211_NODE); } static int8_t node_getrssi(const struct ieee80211_node *ni) { return ni->ni_rssi; } static void node_getsignal(const struct ieee80211_node *ni, int8_t *rssi, int8_t *noise) { *rssi = ni->ni_rssi; *noise = ni->ni_noise; } static void ieee80211_setup_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni, const uint8_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; ni->ni_ath_defkeyix = 0x7fff; 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 uint8_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 uint8_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_node_set_chan(ic, ni); 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 uint8_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_node_set_chan(ic, ni); 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 uint8_t *macaddr, const char *func, int line) #else _ieee80211_find_node(struct ieee80211_node_table *nt, const uint8_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 uint8_t *macaddr, const char *func, int line) #else ieee80211_find_node(struct ieee80211_node_table *nt, const uint8_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 we treat this like * an association so the driver has an opportunity to setup * it's private state. */ struct ieee80211_node * ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt, const uint8_t macaddr[IEEE80211_ADDR_LEN]) { struct ieee80211com *ic = nt->nt_ic; struct ieee80211_node *ni; IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, "%s: mac<%s>\n", __func__, ether_sprintf(macaddr)); 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); if (ic->ic_opmode == IEEE80211_M_AHDEMO) { /* * In adhoc demo mode there are no management * frames to use to discover neighbor capabilities, * so blindly propagate the local configuration * so we can do interesting things (e.g. use * WME to disable ACK's). */ if (ic->ic_flags & IEEE80211_F_WME) ni->ni_flags |= IEEE80211_NODE_QOS; if (ic->ic_flags & IEEE80211_F_FF) ni->ni_flags |= IEEE80211_NODE_FF; } /* XXX not right for 802.1x/WPA */ ieee80211_node_authorize(ni); } return ni; } void ieee80211_init_neighbor(struct ieee80211_node *ni, const struct ieee80211_frame *wh, const struct ieee80211_scanparams *sp) { ni->ni_esslen = sp->ssid[1]; memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]); IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp)); ni->ni_intval = sp->bintval; ni->ni_capinfo = sp->capinfo; ni->ni_chan = ni->ni_ic->ic_curchan; ni->ni_fhdwell = sp->fhdwell; ni->ni_fhindex = sp->fhindex; ni->ni_erp = sp->erp; ni->ni_timoff = sp->timoff; if (sp->wme != NULL) ieee80211_saveie(&ni->ni_wme_ie, sp->wme); if (sp->wpa != NULL) ieee80211_saveie(&ni->ni_wpa_ie, sp->wpa); if (sp->rsn != NULL) ieee80211_saveie(&ni->ni_rsn_ie, sp->rsn); if (sp->ath != NULL) ieee80211_saveath(ni, sp->ath); /* NB: must be after ni_chan is setup */ ieee80211_setup_rates(ni, sp->rates, sp->xrates, IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); } /* * Do node discovery in adhoc mode on receipt of a beacon * or probe response frame. Note that for the driver's * benefit we we treat this like an association so the * driver has an opportunity to setup it's 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; IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, "%s: mac<%s>\n", __func__, ether_sprintf(wh->i_addr2)); ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);/* XXX alloc_node? */ if (ni != NULL) { ieee80211_init_neighbor(ni, wh, sp); if (ic->ic_newassoc != NULL) ic->ic_newassoc(ni, 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) #define IS_BAR(wh) \ ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_BAR) /* * 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 check ic_bss first in station mode */ /* XXX 4-address frames? */ nt = &ic->ic_sta; IEEE80211_NODE_LOCK(nt); if (IS_CTL(wh) && !IS_PSPOLL(wh) && !IS_BAR(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; 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_BAR(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_BAR #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 uint8_t *macaddr, const char *func, int line) #else ieee80211_find_txnode(struct ieee80211com *ic, const uint8_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); if (ic->ic_opmode == IEEE80211_M_HOSTAP && (ni != NULL && ni->ni_associd == 0)) { /* * Station is not associated; don't permit the * data frame to be sent by returning NULL. This * is kinda a kludge but the least intrusive way * to add this check into all drivers. */ ieee80211_unref_node(&ni); /* NB: null's ni */ } } 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 ssid too. */ struct ieee80211_node * #ifdef IEEE80211_DEBUG_REFCNT ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt, const uint8_t *macaddr, u_int ssidlen, const uint8_t *ssid, const char *func, int line) #else ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt, const uint8_t *macaddr, u_int ssidlen, const uint8_t *ssid) #endif { #define MATCH_SSID(ni, ssid, ssidlen) \ (ni->ni_esslen == ssidlen && memcmp(ni->ni_essid, ssid, ssidlen) == 0) static const uint8_t zeromac[IEEE80211_ADDR_LEN]; struct ieee80211_node *ni; int hash; IEEE80211_NODE_LOCK(nt); /* * 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 */ IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE, REFCNT_LOC, ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)); } 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) { KASSERT(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); } } /* * 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; restart: 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 || ic->ic_opmode == IEEE80211_M_STA) && (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. */ if (ieee80211_node_saveq_age(ni) != 0 && IEEE80211_NODE_SAVEQ_QLEN(ni) == 0 && ic->ic_set_tim != NULL) 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...). * * XXX don't probe the station unless we've * received a frame from them (and have * some idea of the rates they are capable * of); this will get fixed more properly * soon with better handling of the rate set. */ if (0 < ni->ni_inact && ni->ni_inact <= ic->ic_inact_probe && ni->ni_rates.rs_nrates != 0) { 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 * wil 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 can result * in a 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); IEEE80211_SCAN_UNLOCK(nt); } void ieee80211_node_timeout(void *arg) { struct ieee80211com *ic = arg; ieee80211_scan_timeout(ic); ieee80211_timeout_stations(&ic->ic_sta); callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz, ieee80211_node_timeout, ic); } 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; restart: 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); IEEE80211_SCAN_UNLOCK(nt); } void ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni) { printf("0x%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[IEEE80211_NONQOS_TID], ni->ni_rxseqs[IEEE80211_NONQOS_TID] >> IEEE80211_SEQ_SEQ_SHIFT, ni->ni_rxseqs[IEEE80211_NONQOS_TID] & IEEE80211_SEQ_FRAG_MASK, ni->ni_rxfragstamp); printf("\trstamp %u rssi %d noise %d intval %u capinfo 0x%x\n", ni->ni_rstamp, ni->ni_rssi, ni->ni_noise, 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); printf("\thtcap %x htparam %x htctlchan %u ht2ndchan %u\n", ni->ni_htcap, ni->ni_htparam, ni->ni_htctlchan, ni->ni_ht2ndchan); printf("\thtopmode %x htstbc %x chw %u\n", ni->ni_htopmode, ni->ni_htstbc, ni->ni_chw); } 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 */ if (!IEEE80211_IS_CHAN_108G(ic->ic_bsschan)) { /* * Don't force slot time when switched to turbo * mode as non-ERP stations won't be present; this * need only be done when on the normal G channel. */ 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; } if (ic->ic_nonerpsta == 1) ic->ic_flags_ext |= IEEE80211_FEXT_ERPUPDATE; } 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) { uint16_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 (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && IEEE80211_IS_CHAN_FULL(ic->ic_bsschan)) 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%s%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" : "", ni->ni_flags & IEEE80211_NODE_HT ? (ni->ni_chw == 20 ? ", HT20" : ", HT40") : "", IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_FF) ? ", fast-frames" : "", IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_TURBOP) ? ", turbo" : "" ); /* 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) { KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan), ("not in 11g, bss %u:0x%x, curmode %u", ic->ic_bsschan->ic_freq, ic->ic_bsschan->ic_flags, ic->ic_curmode)); /* * If a long slot station do the slot time bookkeeping. */ if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) { KASSERT(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) { KASSERT(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; } ic->ic_flags_ext |= IEEE80211_FEXT_ERPUPDATE; } } } /* * 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)); KASSERT(ic->ic_opmode != IEEE80211_M_STA, ("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 it's 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 (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && IEEE80211_IS_CHAN_FULL(ic->ic_bsschan)) 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); } int8_t ieee80211_getrssi(struct ieee80211com *ic) { #define NZ(x) ((x) == 0 ? 1 : (x)) struct ieee80211_node_table *nt = &ic->ic_sta; int rssi_samples; int32_t 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 */ case IEEE80211_M_AHDEMO: /* average of all neighbors */ case IEEE80211_M_HOSTAP: /* average of all associated stations */ /* XXX locking */ TAILQ_FOREACH(ni, &nt->nt_node, ni_list) if (ic->ic_opmode == IEEE80211_M_HOSTAP || (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS)) { int8_t rssi = ic->ic_node_getrssi(ni); if (rssi != 0) { rssi_samples++; rssi_total += rssi; } } 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 } void ieee80211_getsignal(struct ieee80211com *ic, int8_t *rssi, int8_t *noise) { if (ic->ic_bss == NULL) /* NB: shouldn't happen */ return; ic->ic_node_getsignal(ic->ic_bss, rssi, noise); /* for non-station mode return avg'd rssi accounting */ if (ic->ic_opmode != IEEE80211_M_STA) *rssi = ieee80211_getrssi(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) { 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_keyixmax = keyixmax; if (nt->nt_keyixmax > 0) { MALLOC(nt->nt_keyixmap, struct ieee80211_node **, keyixmax * sizeof(struct ieee80211_node *), M_80211_NODE, M_NOWAIT | M_ZERO); if (nt->nt_keyixmap == NULL) if_printf(ic->ic_ifp, "Cannot allocate key index map with %u entries\n", keyixmax); } else nt->nt_keyixmap = NULL; } static 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); 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); 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); }