/* $OpenBSD: ieee80211_node.c,v 1.178 2019/12/29 14:00:36 stsp Exp $ */ /* $NetBSD: ieee80211_node.c,v 1.14 2004/05/09 09:18:47 dyoung Exp $ */ /*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting * Copyright (c) 2008 Damien Bergamini * 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. * * 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 "bridge.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if NBRIDGE > 0 #include #endif #include #include struct ieee80211_node *ieee80211_node_alloc(struct ieee80211com *); void ieee80211_node_free(struct ieee80211com *, struct ieee80211_node *); void ieee80211_node_copy(struct ieee80211com *, struct ieee80211_node *, const struct ieee80211_node *); void ieee80211_choose_rsnparams(struct ieee80211com *); u_int8_t ieee80211_node_getrssi(struct ieee80211com *, const struct ieee80211_node *); int ieee80211_node_checkrssi(struct ieee80211com *, const struct ieee80211_node *); int ieee80211_ess_is_better(struct ieee80211com *ic, struct ieee80211_node *, struct ieee80211_node *); void ieee80211_node_set_timeouts(struct ieee80211_node *); void ieee80211_setup_node(struct ieee80211com *, struct ieee80211_node *, const u_int8_t *); void ieee80211_free_node(struct ieee80211com *, struct ieee80211_node *); struct ieee80211_node *ieee80211_alloc_node_helper(struct ieee80211com *); void ieee80211_node_switch_bss(struct ieee80211com *, struct ieee80211_node *); void ieee80211_node_addba_request(struct ieee80211_node *, int); void ieee80211_node_addba_request_ac_be_to(void *); void ieee80211_node_addba_request_ac_bk_to(void *); void ieee80211_node_addba_request_ac_vi_to(void *); void ieee80211_node_addba_request_ac_vo_to(void *); void ieee80211_needs_auth(struct ieee80211com *, struct ieee80211_node *); #ifndef IEEE80211_STA_ONLY void ieee80211_node_join_ht(struct ieee80211com *, struct ieee80211_node *); void ieee80211_node_join_rsn(struct ieee80211com *, struct ieee80211_node *); void ieee80211_node_join_11g(struct ieee80211com *, struct ieee80211_node *); void ieee80211_node_leave_ht(struct ieee80211com *, struct ieee80211_node *); void ieee80211_node_leave_rsn(struct ieee80211com *, struct ieee80211_node *); void ieee80211_node_leave_11g(struct ieee80211com *, struct ieee80211_node *); void ieee80211_inact_timeout(void *); void ieee80211_node_cache_timeout(void *); #endif void ieee80211_clean_inactive_nodes(struct ieee80211com *, int); #ifndef IEEE80211_STA_ONLY void ieee80211_inact_timeout(void *arg) { struct ieee80211com *ic = arg; struct ieee80211_node *ni, *next_ni; int s; s = splnet(); for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); ni != NULL; ni = next_ni) { next_ni = RBT_NEXT(ieee80211_tree, ni); if (ni->ni_refcnt > 0) continue; if (ni->ni_inact < IEEE80211_INACT_MAX) ni->ni_inact++; } splx(s); timeout_add_sec(&ic->ic_inact_timeout, IEEE80211_INACT_WAIT); } void ieee80211_node_cache_timeout(void *arg) { struct ieee80211com *ic = arg; ieee80211_clean_nodes(ic, 1); timeout_add_sec(&ic->ic_node_cache_timeout, IEEE80211_CACHE_WAIT); } #endif /* * For debug purposes */ void ieee80211_print_ess(struct ieee80211_ess *ess) { ieee80211_print_essid(ess->essid, ess->esslen); if (ess->flags & IEEE80211_F_RSNON) { printf(" wpa"); if (ess->rsnprotos & IEEE80211_PROTO_RSN) printf(",wpa2"); if (ess->rsnprotos & IEEE80211_PROTO_WPA) printf(",wpa1"); if (ess->rsnakms & IEEE80211_AKM_8021X || ess->rsnakms & IEEE80211_AKM_SHA256_8021X) printf(",802.1x"); printf(" "); if (ess->rsnciphers & IEEE80211_CIPHER_USEGROUP) printf(" usegroup"); if (ess->rsnciphers & IEEE80211_CIPHER_WEP40) printf(" wep40"); if (ess->rsnciphers & IEEE80211_CIPHER_WEP104) printf(" wep104"); if (ess->rsnciphers & IEEE80211_CIPHER_TKIP) printf(" tkip"); if (ess->rsnciphers & IEEE80211_CIPHER_CCMP) printf(" ccmp"); } if (ess->flags & IEEE80211_F_WEPON) { int i = ess->def_txkey; printf(" wep,"); if (ess->nw_keys[i].k_cipher & IEEE80211_CIPHER_WEP40) printf("wep40"); if (ess->nw_keys[i].k_cipher & IEEE80211_CIPHER_WEP104) printf("wep104"); } if (ess->flags == 0) printf(" clear"); printf("\n"); } void ieee80211_print_ess_list(struct ieee80211com *ic) { struct ifnet *ifp = &ic->ic_if; struct ieee80211_ess *ess; printf("%s: known networks\n", ifp->if_xname); TAILQ_FOREACH(ess, &ic->ic_ess, ess_next) { ieee80211_print_ess(ess); } } struct ieee80211_ess * ieee80211_get_ess(struct ieee80211com *ic, const char *nwid, int len) { struct ieee80211_ess *ess; TAILQ_FOREACH(ess, &ic->ic_ess, ess_next) { if (len == ess->esslen && memcmp(ess->essid, nwid, ess->esslen) == 0) return ess; } return NULL; } void ieee80211_del_ess(struct ieee80211com *ic, char *nwid, int len, int all) { struct ieee80211_ess *ess, *next; TAILQ_FOREACH_SAFE(ess, &ic->ic_ess, ess_next, next) { if (all == 1 || (ess->esslen == len && memcmp(ess->essid, nwid, len) == 0)) { TAILQ_REMOVE(&ic->ic_ess, ess, ess_next); explicit_bzero(ess, sizeof(*ess)); free(ess, M_DEVBUF, sizeof(*ess)); if (TAILQ_EMPTY(&ic->ic_ess)) ic->ic_flags &= ~IEEE80211_F_AUTO_JOIN; if (all != 1) return; } } } /* Keep in sync with ieee80211_ioctl.c:ieee80211_ioctl_setnwkeys() */ static int ieee80211_ess_setnwkeys(struct ieee80211_ess *ess, const struct ieee80211_nwkey *nwkey) { struct ieee80211_key *k; int error, i; if (nwkey->i_wepon == IEEE80211_NWKEY_OPEN) { if (!(ess->flags & IEEE80211_F_WEPON)) return 0; ess->flags &= ~IEEE80211_F_WEPON; return ENETRESET; } if (nwkey->i_defkid < 1 || nwkey->i_defkid > IEEE80211_WEP_NKID) return EINVAL; for (i = 0; i < IEEE80211_WEP_NKID; i++) { if (nwkey->i_key[i].i_keylen == 0 || nwkey->i_key[i].i_keydat == NULL) continue; /* entry not set */ if (nwkey->i_key[i].i_keylen > IEEE80211_KEYBUF_SIZE) return EINVAL; /* map wep key to ieee80211_key */ k = &ess->nw_keys[i]; memset(k, 0, sizeof(*k)); if (nwkey->i_key[i].i_keylen <= 5) k->k_cipher = IEEE80211_CIPHER_WEP40; else k->k_cipher = IEEE80211_CIPHER_WEP104; k->k_len = ieee80211_cipher_keylen(k->k_cipher); k->k_flags = IEEE80211_KEY_GROUP | IEEE80211_KEY_TX; error = copyin(nwkey->i_key[i].i_keydat, k->k_key, k->k_len); if (error != 0) return error; } ess->def_txkey = nwkey->i_defkid - 1; ess->flags |= IEEE80211_F_WEPON; return ENETRESET; } /* Keep in sync with ieee80211_ioctl.c:ieee80211_ioctl_setwpaparms() */ static int ieee80211_ess_setwpaparms(struct ieee80211_ess *ess, const struct ieee80211_wpaparams *wpa) { if (!wpa->i_enabled) { if (!(ess->flags & IEEE80211_F_RSNON)) return 0; ess->flags &= ~IEEE80211_F_RSNON; ess->rsnprotos = 0; ess->rsnakms = 0; ess->rsngroupcipher = 0; ess->rsnciphers = 0; return ENETRESET; } ess->rsnprotos = 0; if (wpa->i_protos & IEEE80211_WPA_PROTO_WPA1) ess->rsnprotos |= IEEE80211_PROTO_WPA; if (wpa->i_protos & IEEE80211_WPA_PROTO_WPA2) ess->rsnprotos |= IEEE80211_PROTO_RSN; if (ess->rsnprotos == 0) /* set to default (RSN) */ ess->rsnprotos = IEEE80211_PROTO_RSN; ess->rsnakms = 0; if (wpa->i_akms & IEEE80211_WPA_AKM_PSK) ess->rsnakms |= IEEE80211_AKM_PSK; if (wpa->i_akms & IEEE80211_WPA_AKM_SHA256_PSK) ess->rsnakms |= IEEE80211_AKM_SHA256_PSK; if (wpa->i_akms & IEEE80211_WPA_AKM_8021X) ess->rsnakms |= IEEE80211_AKM_8021X; if (wpa->i_akms & IEEE80211_WPA_AKM_SHA256_8021X) ess->rsnakms |= IEEE80211_AKM_SHA256_8021X; if (ess->rsnakms == 0) /* set to default (PSK) */ ess->rsnakms = IEEE80211_AKM_PSK; if (wpa->i_groupcipher == IEEE80211_WPA_CIPHER_WEP40) ess->rsngroupcipher = IEEE80211_CIPHER_WEP40; else if (wpa->i_groupcipher == IEEE80211_WPA_CIPHER_TKIP) ess->rsngroupcipher = IEEE80211_CIPHER_TKIP; else if (wpa->i_groupcipher == IEEE80211_WPA_CIPHER_CCMP) ess->rsngroupcipher = IEEE80211_CIPHER_CCMP; else if (wpa->i_groupcipher == IEEE80211_WPA_CIPHER_WEP104) ess->rsngroupcipher = IEEE80211_CIPHER_WEP104; else { /* set to default */ if (ess->rsnprotos & IEEE80211_PROTO_WPA) ess->rsngroupcipher = IEEE80211_CIPHER_TKIP; else ess->rsngroupcipher = IEEE80211_CIPHER_CCMP; } ess->rsnciphers = 0; if (wpa->i_ciphers & IEEE80211_WPA_CIPHER_TKIP) ess->rsnciphers |= IEEE80211_CIPHER_TKIP; if (wpa->i_ciphers & IEEE80211_WPA_CIPHER_CCMP) ess->rsnciphers |= IEEE80211_CIPHER_CCMP; if (wpa->i_ciphers & IEEE80211_WPA_CIPHER_USEGROUP) ess->rsnciphers = IEEE80211_CIPHER_USEGROUP; if (ess->rsnciphers == 0) { /* set to default (CCMP, TKIP if WPA1) */ ess->rsnciphers = IEEE80211_CIPHER_CCMP; if (ess->rsnprotos & IEEE80211_PROTO_WPA) ess->rsnciphers |= IEEE80211_CIPHER_TKIP; } ess->flags |= IEEE80211_F_RSNON; if (ess->rsnakms & (IEEE80211_AKM_8021X|IEEE80211_WPA_AKM_SHA256_8021X)) ess->flags |= IEEE80211_JOIN_8021X; return ENETRESET; } static void ieee80211_ess_clear_wep(struct ieee80211_ess *ess) { int i; /* Disable WEP */ for (i = 0; i < IEEE80211_WEP_NKID; i++) { explicit_bzero(&ess->nw_keys[i], sizeof(ess->nw_keys[0])); } ess->def_txkey = 0; ess->flags &= ~IEEE80211_F_WEPON; } static void ieee80211_ess_clear_wpa(struct ieee80211_ess *ess) { /* Disable WPA */ ess->rsnprotos = ess->rsnakms = ess->rsngroupcipher = ess->rsnciphers = 0; explicit_bzero(ess->psk, sizeof(ess->psk)); ess->flags &= ~(IEEE80211_F_PSK | IEEE80211_F_RSNON); } int ieee80211_add_ess(struct ieee80211com *ic, struct ieee80211_join *join) { struct ieee80211_ess *ess; int new = 0, ness = 0; /* only valid for station (aka, client) mode */ if (ic->ic_opmode != IEEE80211_M_STA) return (0); TAILQ_FOREACH(ess, &ic->ic_ess, ess_next) { if (ess->esslen == join->i_len && memcmp(ess->essid, join->i_nwid, ess->esslen) == 0) break; ness++; } if (ess == NULL) { /* if not found, and wpa/wep are set, then return */ if ((join->i_flags & IEEE80211_JOIN_WPA) && (join->i_flags & IEEE80211_JOIN_NWKEY)) { return (EINVAL); } if (ness > IEEE80211_CACHE_SIZE) return (ERANGE); new = 1; ess = malloc(sizeof(*ess), M_DEVBUF, M_NOWAIT|M_ZERO); if (ess == NULL) return (ENOMEM); memcpy(ess->essid, join->i_nwid, join->i_len); ess->esslen = join->i_len; } if (join->i_flags & IEEE80211_JOIN_WPA) { if (join->i_wpaparams.i_enabled) { if (!(ic->ic_caps & IEEE80211_C_RSN)) { free(ess, M_DEVBUF, sizeof(*ess)); return ENODEV; } ieee80211_ess_setwpaparms(ess, &join->i_wpaparams); if (join->i_flags & IEEE80211_JOIN_WPAPSK) { ess->flags |= IEEE80211_F_PSK; explicit_bzero(ess->psk, sizeof(ess->psk)); memcpy(ess->psk, &join->i_wpapsk.i_psk, sizeof(ess->psk)); } ieee80211_ess_clear_wep(ess); } else { ieee80211_ess_clear_wpa(ess); } } else if (join->i_flags & IEEE80211_JOIN_NWKEY) { if (join->i_nwkey.i_wepon) { if (!(ic->ic_caps & IEEE80211_C_WEP)) { free(ess, M_DEVBUF, sizeof(*ess)); return ENODEV; } ieee80211_ess_setnwkeys(ess, &join->i_nwkey); ieee80211_ess_clear_wpa(ess); } else { ieee80211_ess_clear_wep(ess); } } if (new) TAILQ_INSERT_TAIL(&ic->ic_ess, ess, ess_next); return (0); } uint8_t ieee80211_ess_adjust_rssi(struct ieee80211com *ic, struct ieee80211_node *ni) { uint8_t rssi = ni->ni_rssi; /* * Slightly punish 2 GHz RSSI values since they are usually * stronger than 5 GHz RSSI values. */ if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) { if (ic->ic_max_rssi) { uint8_t p = (5 * ic->ic_max_rssi) / 100; if (rssi >= p) rssi -= p; /* punish by 5% */ } else { if (rssi >= 8) rssi -= 8; /* punish by 8 dBm */ } } return rssi; } int ieee80211_ess_calculate_score(struct ieee80211com *ic, struct ieee80211_node *ni) { int score = 0; uint8_t min_5ghz_rssi; if (ic->ic_max_rssi) min_5ghz_rssi = IEEE80211_RSSI_THRES_RATIO_5GHZ; else min_5ghz_rssi = (uint8_t)IEEE80211_RSSI_THRES_5GHZ; /* not using join any */ if (ieee80211_get_ess(ic, ni->ni_essid, ni->ni_esslen)) score += 32; /* Calculate the crypto score */ if (ni->ni_rsnprotos & IEEE80211_PROTO_RSN) score += 16; if (ni->ni_rsnprotos & IEEE80211_PROTO_WPA) score += 8; if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) score += 4; /* 5GHz with a good signal */ if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan) && ni->ni_rssi > min_5ghz_rssi) score += 2; /* Boost this AP if it had no auth/assoc failures in the past. */ if (ni->ni_fails == 0) score += 21; return score; } /* * Given two APs, determine the "better" one of the two. * We compute a score based on the following attributes: * * crypto: wpa2 > wpa1 > wep > open * band: 5 GHz > 2 GHz provided 5 GHz rssi is above threshold * rssi: rssi1 > rssi2 as a numeric comparison with a slight * disadvantage for 2 GHz APs * * Crypto carries most weight, followed by band, followed by rssi. */ int ieee80211_ess_is_better(struct ieee80211com *ic, struct ieee80211_node *nicur, struct ieee80211_node *nican) { struct ifnet *ifp = &ic->ic_if; int score_cur = 0, score_can = 0; int cur_rssi, can_rssi; score_cur = ieee80211_ess_calculate_score(ic, nicur); score_can = ieee80211_ess_calculate_score(ic, nican); cur_rssi = ieee80211_ess_adjust_rssi(ic, nicur); can_rssi = ieee80211_ess_adjust_rssi(ic, nican); if (can_rssi > cur_rssi) score_can++; if ((ifp->if_flags & IFF_DEBUG) && (score_can <= score_cur)) { printf("%s: AP %s ", ifp->if_xname, ether_sprintf(nican->ni_bssid)); ieee80211_print_essid(nican->ni_essid, nican->ni_esslen); printf(" score %d\n", score_can); } return score_can > score_cur; } /* Determine whether a candidate AP belongs to a given ESS. */ int ieee80211_match_ess(struct ieee80211_ess *ess, struct ieee80211_node *ni) { if (ess->esslen != 0 && (ess->esslen != ni->ni_esslen || memcmp(ess->essid, ni->ni_essid, ess->esslen) != 0)) { ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_ESSID; return 0; } if (ess->flags & (IEEE80211_F_PSK | IEEE80211_F_RSNON)) { /* Ensure same WPA version. */ if ((ni->ni_rsnprotos & IEEE80211_PROTO_RSN) && (ess->rsnprotos & IEEE80211_PROTO_RSN) == 0) { ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; return 0; } if ((ni->ni_rsnprotos & IEEE80211_PROTO_WPA) && (ess->rsnprotos & IEEE80211_PROTO_WPA) == 0) { ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; return 0; } } else if (ess->flags & IEEE80211_F_WEPON) { if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) { ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; return 0; } } else { if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) != 0) { ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; return 0; } } if (ess->esslen == 0 && (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) != 0) { ni->ni_assoc_fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; return 0; } return 1; } void ieee80211_switch_ess(struct ieee80211com *ic) { struct ifnet *ifp = &ic->ic_if; struct ieee80211_ess *ess, *seless = NULL; struct ieee80211_node *ni, *selni = NULL; if (!ISSET(ifp->if_flags, IFF_RUNNING)) return; /* Find the best AP matching an entry on our ESS join list. */ RBT_FOREACH(ni, ieee80211_tree, &ic->ic_tree) { if ((ic->ic_flags & IEEE80211_F_DESBSSID) && !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) continue; TAILQ_FOREACH(ess, &ic->ic_ess, ess_next) { if (ieee80211_match_ess(ess, ni)) break; } if (ess == NULL) continue; /* * Operate only on ic_des_essid if auto-join is disabled. * We might have a password stored for this network. */ if (!ISSET(ic->ic_flags, IEEE80211_F_AUTO_JOIN)) { if (ic->ic_des_esslen == ni->ni_esslen && memcmp(ic->ic_des_essid, ni->ni_essid, ni->ni_esslen) == 0) { ieee80211_set_ess(ic, ess, ni); return; } continue; } if (selni == NULL) { seless = ess; selni = ni; continue; } if (ieee80211_ess_is_better(ic, selni, ni)) { seless = ess; selni = ni; } } if (selni && seless && !(selni->ni_esslen == ic->ic_des_esslen && (memcmp(ic->ic_des_essid, selni->ni_essid, IEEE80211_NWID_LEN) == 0))) { if (ifp->if_flags & IFF_DEBUG) { printf("%s: best AP %s ", ifp->if_xname, ether_sprintf(selni->ni_bssid)); ieee80211_print_essid(selni->ni_essid, selni->ni_esslen); printf(" score %d\n", ieee80211_ess_calculate_score(ic, selni)); printf("%s: switching to network ", ifp->if_xname); ieee80211_print_essid(selni->ni_essid, selni->ni_esslen); if (seless->esslen == 0) printf(" via join any"); printf("\n"); } ieee80211_set_ess(ic, seless, selni); } } void ieee80211_set_ess(struct ieee80211com *ic, struct ieee80211_ess *ess, struct ieee80211_node *ni) { memset(ic->ic_des_essid, 0, IEEE80211_NWID_LEN); ic->ic_des_esslen = ni->ni_esslen; memcpy(ic->ic_des_essid, ni->ni_essid, ic->ic_des_esslen); ieee80211_disable_wep(ic); ieee80211_disable_rsn(ic); if (ess->flags & IEEE80211_F_RSNON) { explicit_bzero(ic->ic_psk, sizeof(ic->ic_psk)); memcpy(ic->ic_psk, ess->psk, sizeof(ic->ic_psk)); ic->ic_rsnprotos = ess->rsnprotos; ic->ic_rsnakms = ess->rsnakms; ic->ic_rsngroupcipher = ess->rsngroupcipher; ic->ic_rsnciphers = ess->rsnciphers; ic->ic_flags |= IEEE80211_F_RSNON; if (ess->flags & IEEE80211_F_PSK) ic->ic_flags |= IEEE80211_F_PSK; } else if (ess->flags & IEEE80211_F_WEPON) { struct ieee80211_key *k; int i; for (i = 0; i < IEEE80211_WEP_NKID; i++) { k = &ic->ic_nw_keys[i]; if (k->k_cipher != IEEE80211_CIPHER_NONE) (*ic->ic_delete_key)(ic, NULL, k); memcpy(&ic->ic_nw_keys[i], &ess->nw_keys[i], sizeof(struct ieee80211_key)); (*ic->ic_set_key)(ic, NULL, k); } ic->ic_def_txkey = ess->def_txkey; ic->ic_flags |= IEEE80211_F_WEPON; } } void ieee80211_deselect_ess(struct ieee80211com *ic) { memset(ic->ic_des_essid, 0, IEEE80211_NWID_LEN); ic->ic_des_esslen = 0; ieee80211_disable_wep(ic); ieee80211_disable_rsn(ic); } void ieee80211_node_attach(struct ifnet *ifp) { struct ieee80211com *ic = (void *)ifp; #ifndef IEEE80211_STA_ONLY int size; #endif RBT_INIT(ieee80211_tree, &ic->ic_tree); ic->ic_node_alloc = ieee80211_node_alloc; ic->ic_node_free = ieee80211_node_free; ic->ic_node_copy = ieee80211_node_copy; ic->ic_node_getrssi = ieee80211_node_getrssi; ic->ic_node_checkrssi = ieee80211_node_checkrssi; ic->ic_scangen = 1; ic->ic_max_nnodes = ieee80211_cache_size; if (ic->ic_max_aid == 0) ic->ic_max_aid = IEEE80211_AID_DEF; else if (ic->ic_max_aid > IEEE80211_AID_MAX) ic->ic_max_aid = IEEE80211_AID_MAX; #ifndef IEEE80211_STA_ONLY size = howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t); ic->ic_aid_bitmap = malloc(size, M_DEVBUF, 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; } if (ic->ic_caps & (IEEE80211_C_HOSTAP | IEEE80211_C_IBSS)) { ic->ic_tim_len = howmany(ic->ic_max_aid, 8); ic->ic_tim_bitmap = malloc(ic->ic_tim_len, M_DEVBUF, M_NOWAIT | M_ZERO); if (ic->ic_tim_bitmap == NULL) { printf("%s: no memory for TIM bitmap!\n", __func__); ic->ic_tim_len = 0; } else ic->ic_set_tim = ieee80211_set_tim; timeout_set(&ic->ic_rsn_timeout, ieee80211_gtk_rekey_timeout, ic); timeout_set(&ic->ic_inact_timeout, ieee80211_inact_timeout, ic); timeout_set(&ic->ic_node_cache_timeout, ieee80211_node_cache_timeout, ic); } #endif TAILQ_INIT(&ic->ic_ess); } struct ieee80211_node * ieee80211_alloc_node_helper(struct ieee80211com *ic) { struct ieee80211_node *ni; if (ic->ic_nnodes >= ic->ic_max_nnodes) ieee80211_clean_nodes(ic, 0); if (ic->ic_nnodes >= ic->ic_max_nnodes) return NULL; ni = (*ic->ic_node_alloc)(ic); return ni; } void ieee80211_node_lateattach(struct ifnet *ifp) { struct ieee80211com *ic = (void *)ifp; struct ieee80211_node *ni; ni = ieee80211_alloc_node_helper(ic); if (ni == NULL) panic("unable to setup inital BSS node"); ni->ni_chan = IEEE80211_CHAN_ANYC; ic->ic_bss = ieee80211_ref_node(ni); ic->ic_txpower = IEEE80211_TXPOWER_MAX; #ifndef IEEE80211_STA_ONLY mq_init(&ni->ni_savedq, IEEE80211_PS_MAX_QUEUE, IPL_NET); #endif } void ieee80211_node_detach(struct ifnet *ifp) { struct ieee80211com *ic = (void *)ifp; if (ic->ic_bss != NULL) { (*ic->ic_node_free)(ic, ic->ic_bss); ic->ic_bss = NULL; } ieee80211_del_ess(ic, NULL, 0, 1); ieee80211_free_allnodes(ic, 1); #ifndef IEEE80211_STA_ONLY free(ic->ic_aid_bitmap, M_DEVBUF, howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t)); free(ic->ic_tim_bitmap, M_DEVBUF, ic->ic_tim_len); timeout_del(&ic->ic_inact_timeout); timeout_del(&ic->ic_node_cache_timeout); timeout_del(&ic->ic_tkip_micfail_timeout); #endif timeout_del(&ic->ic_rsn_timeout); } /* * AP scanning support. */ /* * Initialize the active channel set based on the set * of available channels and the current PHY mode. */ void ieee80211_reset_scan(struct ifnet *ifp) { struct ieee80211com *ic = (void *)ifp; memcpy(ic->ic_chan_scan, ic->ic_chan_active, sizeof(ic->ic_chan_active)); /* NB: hack, setup so next_scan starts with the first channel */ if (ic->ic_bss != NULL && ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC) ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX]; } /* * Increase a node's inactivity counter. * This counter get reset to zero if a frame is received. * This function is intended for station mode only. * See ieee80211_node_cache_timeout() for hostap mode. */ void ieee80211_node_raise_inact(void *arg, struct ieee80211_node *ni) { if (ni->ni_refcnt == 0 && ni->ni_inact < IEEE80211_INACT_SCAN) ni->ni_inact++; } /* * Begin an active scan. */ void ieee80211_begin_scan(struct ifnet *ifp) { struct ieee80211com *ic = (void *)ifp; /* * In all but hostap mode scanning starts off in * an active mode before switching to passive. */ #ifndef IEEE80211_STA_ONLY if (ic->ic_opmode != IEEE80211_M_HOSTAP) #endif { ic->ic_flags |= IEEE80211_F_ASCAN; ic->ic_stats.is_scan_active++; } #ifndef IEEE80211_STA_ONLY else ic->ic_stats.is_scan_passive++; #endif if (ifp->if_flags & IFF_DEBUG) printf("%s: begin %s scan\n", ifp->if_xname, (ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive"); if (ic->ic_opmode == IEEE80211_M_STA) { ieee80211_node_cleanup(ic, ic->ic_bss); ieee80211_iterate_nodes(ic, ieee80211_node_raise_inact, NULL); } /* * Reset the current mode. Setting the current mode will also * reset scan state. */ if (IFM_MODE(ic->ic_media.ifm_cur->ifm_media) == IFM_AUTO) ic->ic_curmode = IEEE80211_MODE_AUTO; ieee80211_setmode(ic, ic->ic_curmode); ic->ic_scan_count = 0; /* Scan the next channel. */ ieee80211_next_scan(ifp); } /* * Switch to the next channel marked for scanning. */ void ieee80211_next_scan(struct ifnet *ifp) { struct ieee80211com *ic = (void *)ifp; struct ieee80211_channel *chan; chan = ic->ic_bss->ni_chan; for (;;) { if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX]) chan = &ic->ic_channels[0]; if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) { /* * Ignore channels marked passive-only * during an active scan. */ if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 || (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) break; } if (chan == ic->ic_bss->ni_chan) { ieee80211_end_scan(ifp); return; } } clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan)); DPRINTF(("chan %d->%d\n", ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan), ieee80211_chan2ieee(ic, chan))); ic->ic_bss->ni_chan = chan; ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); } #ifndef IEEE80211_STA_ONLY void ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan) { struct ieee80211_node *ni; struct ifnet *ifp = &ic->ic_if; ni = ic->ic_bss; if (ifp->if_flags & IFF_DEBUG) printf("%s: creating ibss\n", ifp->if_xname); ic->ic_flags |= IEEE80211_F_SIBSS; ni->ni_chan = chan; ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; ni->ni_txrate = 0; IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr); IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr); if (ic->ic_opmode == IEEE80211_M_IBSS) { if ((ic->ic_flags & IEEE80211_F_DESBSSID) != 0) IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid); else ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */ } ni->ni_esslen = ic->ic_des_esslen; memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen); ni->ni_rssi = 0; ni->ni_rstamp = 0; memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp)); ni->ni_intval = ic->ic_lintval; ni->ni_capinfo = IEEE80211_CAPINFO_IBSS; if (ic->ic_flags & IEEE80211_F_WEPON) ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY; if (ic->ic_flags & IEEE80211_F_HTON) { const struct ieee80211_edca_ac_params *ac_qap; struct ieee80211_edca_ac_params *ac; int aci; /* * Configure HT protection. This will be updated later * based on the number of non-HT nodes in the node cache. */ ic->ic_protmode = IEEE80211_PROT_NONE; ni->ni_htop1 = IEEE80211_HTPROT_NONE; /* Disallow Greenfield mode. None of our drivers support it. */ ni->ni_htop1 |= IEEE80211_HTOP1_NONGF_STA; if (ic->ic_update_htprot) ic->ic_update_htprot(ic, ni); /* Configure QoS EDCA parameters. */ for (aci = 0; aci < EDCA_NUM_AC; aci++) { ac = &ic->ic_edca_ac[aci]; ac_qap = &ieee80211_qap_edca_table[ic->ic_curmode][aci]; ac->ac_acm = ac_qap->ac_acm; ac->ac_aifsn = ac_qap->ac_aifsn; ac->ac_ecwmin = ac_qap->ac_ecwmin; ac->ac_ecwmax = ac_qap->ac_ecwmax; ac->ac_txoplimit = ac_qap->ac_txoplimit; } if (ic->ic_updateedca) (*ic->ic_updateedca)(ic); } if (ic->ic_flags & IEEE80211_F_RSNON) { struct ieee80211_key *k; /* initialize 256-bit global key counter to a random value */ arc4random_buf(ic->ic_globalcnt, EAPOL_KEY_NONCE_LEN); ni->ni_rsnprotos = ic->ic_rsnprotos; ni->ni_rsnakms = ic->ic_rsnakms; ni->ni_rsnciphers = ic->ic_rsnciphers; ni->ni_rsngroupcipher = ic->ic_rsngroupcipher; ni->ni_rsngroupmgmtcipher = ic->ic_rsngroupmgmtcipher; ni->ni_rsncaps = 0; if (ic->ic_caps & IEEE80211_C_MFP) { ni->ni_rsncaps |= IEEE80211_RSNCAP_MFPC; if (ic->ic_flags & IEEE80211_F_MFPR) ni->ni_rsncaps |= IEEE80211_RSNCAP_MFPR; } ic->ic_def_txkey = 1; ic->ic_flags &= ~IEEE80211_F_COUNTERM; k = &ic->ic_nw_keys[ic->ic_def_txkey]; memset(k, 0, sizeof(*k)); k->k_id = ic->ic_def_txkey; k->k_cipher = ni->ni_rsngroupcipher; k->k_flags = IEEE80211_KEY_GROUP | IEEE80211_KEY_TX; k->k_len = ieee80211_cipher_keylen(k->k_cipher); arc4random_buf(k->k_key, k->k_len); (*ic->ic_set_key)(ic, ni, k); /* XXX */ if (ic->ic_caps & IEEE80211_C_MFP) { ic->ic_igtk_kid = 4; k = &ic->ic_nw_keys[ic->ic_igtk_kid]; memset(k, 0, sizeof(*k)); k->k_id = ic->ic_igtk_kid; k->k_cipher = ni->ni_rsngroupmgmtcipher; k->k_flags = IEEE80211_KEY_IGTK | IEEE80211_KEY_TX; k->k_len = 16; arc4random_buf(k->k_key, k->k_len); (*ic->ic_set_key)(ic, ni, k); /* XXX */ } /* * In HostAP mode, multicast traffic is sent using ic_bss * as the Tx node, so mark our node as valid so we can send * multicast frames using the group key we've just configured. */ ni->ni_port_valid = 1; ni->ni_flags |= IEEE80211_NODE_TXPROT; /* schedule a GTK/IGTK rekeying after 3600s */ timeout_add_sec(&ic->ic_rsn_timeout, 3600); } timeout_add_sec(&ic->ic_inact_timeout, IEEE80211_INACT_WAIT); timeout_add_sec(&ic->ic_node_cache_timeout, IEEE80211_CACHE_WAIT); ieee80211_new_state(ic, IEEE80211_S_RUN, -1); } #endif /* IEEE80211_STA_ONLY */ int ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni, int bgscan) { u_int8_t rate; int fail; fail = 0; if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan))) fail |= IEEE80211_NODE_ASSOCFAIL_CHAN; if (ic->ic_des_chan != IEEE80211_CHAN_ANYC && ni->ni_chan != ic->ic_des_chan) fail |= IEEE80211_NODE_ASSOCFAIL_CHAN; #ifndef IEEE80211_STA_ONLY if (ic->ic_opmode == IEEE80211_M_IBSS) { if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0) fail |= IEEE80211_NODE_ASSOCFAIL_IBSS; } else #endif { if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0) fail |= IEEE80211_NODE_ASSOCFAIL_IBSS; } if (ic->ic_flags & (IEEE80211_F_WEPON | IEEE80211_F_RSNON)) { if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0) fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; } else { if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) fail |= IEEE80211_NODE_ASSOCFAIL_PRIVACY; } rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO); if (rate & IEEE80211_RATE_BASIC) fail |= IEEE80211_NODE_ASSOCFAIL_BASIC_RATE; if (ic->ic_des_esslen == 0) fail |= IEEE80211_NODE_ASSOCFAIL_ESSID; 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 |= IEEE80211_NODE_ASSOCFAIL_ESSID; if ((ic->ic_flags & IEEE80211_F_DESBSSID) && !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid)) fail |= IEEE80211_NODE_ASSOCFAIL_BSSID; if (ic->ic_flags & IEEE80211_F_RSNON) { /* * If at least one RSN IE field from the AP's RSN IE fails * to overlap with any value the STA supports, the STA shall * decline to associate with that AP. */ if ((ni->ni_rsnprotos & ic->ic_rsnprotos) == 0) fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; if ((ni->ni_rsnakms & ic->ic_rsnakms) == 0) fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; if ((ni->ni_rsnakms & ic->ic_rsnakms & ~(IEEE80211_AKM_PSK | IEEE80211_AKM_SHA256_PSK)) == 0) { /* AP only supports PSK AKMPs */ if (!(ic->ic_flags & IEEE80211_F_PSK)) fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; } if (ni->ni_rsngroupcipher != IEEE80211_CIPHER_WEP40 && ni->ni_rsngroupcipher != IEEE80211_CIPHER_TKIP && ni->ni_rsngroupcipher != IEEE80211_CIPHER_CCMP && ni->ni_rsngroupcipher != IEEE80211_CIPHER_WEP104) fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; if ((ni->ni_rsnciphers & ic->ic_rsnciphers) == 0) fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; /* we only support BIP as the IGTK cipher */ if ((ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC) && ni->ni_rsngroupmgmtcipher != IEEE80211_CIPHER_BIP) fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; /* we do not support MFP but AP requires it */ if (!(ic->ic_caps & IEEE80211_C_MFP) && (ni->ni_rsncaps & IEEE80211_RSNCAP_MFPR)) fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; /* we require MFP but AP does not support it */ if ((ic->ic_caps & IEEE80211_C_MFP) && (ic->ic_flags & IEEE80211_F_MFPR) && !(ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC)) fail |= IEEE80211_NODE_ASSOCFAIL_WPA_PROTO; } if (ic->ic_if.if_flags & IFF_DEBUG) { printf("%s: %c %s%c", ic->ic_if.if_xname, fail ? '-' : '+', ether_sprintf(ni->ni_bssid), fail & IEEE80211_NODE_ASSOCFAIL_BSSID ? '!' : ' '); printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan), fail & IEEE80211_NODE_ASSOCFAIL_CHAN ? '!' : ' '); printf(" %+4d", ni->ni_rssi); printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2, fail & IEEE80211_NODE_ASSOCFAIL_BASIC_RATE ? '!' : ' '); printf(" %4s%c", (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" : (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" : "????", fail & IEEE80211_NODE_ASSOCFAIL_IBSS ? '!' : ' '); printf(" %7s%c ", (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? "privacy" : "no", fail & IEEE80211_NODE_ASSOCFAIL_PRIVACY ? '!' : ' '); printf(" %3s%c ", (ic->ic_flags & IEEE80211_F_RSNON) ? "rsn" : "no", fail & IEEE80211_NODE_ASSOCFAIL_WPA_PROTO ? '!' : ' '); ieee80211_print_essid(ni->ni_essid, ni->ni_esslen); printf("%s\n", fail & IEEE80211_NODE_ASSOCFAIL_ESSID ? "!" : ""); } /* We don't care about unrelated networks during background scans. */ if (bgscan) { if ((fail & IEEE80211_NODE_ASSOCFAIL_ESSID) == 0) ni->ni_assoc_fail = fail; } else ni->ni_assoc_fail = fail; if ((fail & IEEE80211_NODE_ASSOCFAIL_ESSID) == 0) ic->ic_bss->ni_assoc_fail = ni->ni_assoc_fail; return fail; } struct ieee80211_node_switch_bss_arg { u_int8_t cur_macaddr[IEEE80211_ADDR_LEN]; u_int8_t sel_macaddr[IEEE80211_ADDR_LEN]; }; /* Implements ni->ni_unref_cb(). */ void ieee80211_node_switch_bss(struct ieee80211com *ic, struct ieee80211_node *ni) { struct ifnet *ifp = &ic->ic_if; struct ieee80211_node_switch_bss_arg *sba = ni->ni_unref_arg; struct ieee80211_node *curbs, *selbs; splassert(IPL_NET); if ((ic->ic_flags & IEEE80211_F_BGSCAN) == 0) { free(sba, M_DEVBUF, sizeof(*sba)); return; } ic->ic_xflags &= ~IEEE80211_F_TX_MGMT_ONLY; selbs = ieee80211_find_node(ic, sba->sel_macaddr); if (selbs == NULL) { free(sba, M_DEVBUF, sizeof(*sba)); ic->ic_flags &= ~IEEE80211_F_BGSCAN; ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); return; } curbs = ieee80211_find_node(ic, sba->cur_macaddr); if (curbs == NULL) { free(sba, M_DEVBUF, sizeof(*sba)); ic->ic_flags &= ~IEEE80211_F_BGSCAN; ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); return; } if (ifp->if_flags & IFF_DEBUG) { printf("%s: roaming from %s chan %d ", ifp->if_xname, ether_sprintf(curbs->ni_macaddr), ieee80211_chan2ieee(ic, curbs->ni_chan)); printf("to %s chan %d\n", ether_sprintf(selbs->ni_macaddr), ieee80211_chan2ieee(ic, selbs->ni_chan)); } ieee80211_node_newstate(curbs, IEEE80211_STA_CACHE); ieee80211_node_join_bss(ic, selbs); /* frees arg and ic->ic_bss */ } void ieee80211_node_join_bss(struct ieee80211com *ic, struct ieee80211_node *selbs) { enum ieee80211_phymode mode; struct ieee80211_node *ni; uint32_t assoc_fail = 0; /* Reinitialize media mode and channels if needed. */ mode = ieee80211_chan2mode(ic, selbs->ni_chan); if (mode != ic->ic_curmode) ieee80211_setmode(ic, mode); /* Keep recorded association failures for this BSS/ESS intact. */ if (IEEE80211_ADDR_EQ(ic->ic_bss->ni_macaddr, selbs->ni_macaddr) || (ic->ic_des_esslen > 0 && ic->ic_des_esslen == selbs->ni_esslen && memcmp(ic->ic_des_essid, selbs->ni_essid, selbs->ni_esslen) == 0)) assoc_fail = ic->ic_bss->ni_assoc_fail; (*ic->ic_node_copy)(ic, ic->ic_bss, selbs); ni = ic->ic_bss; ni->ni_assoc_fail |= assoc_fail; ic->ic_curmode = ieee80211_chan2mode(ic, ni->ni_chan); /* Make sure we send valid rates in an association request. */ if (ic->ic_opmode == IEEE80211_M_STA) ieee80211_fix_rate(ic, ni, IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (ic->ic_flags & IEEE80211_F_RSNON) ieee80211_choose_rsnparams(ic); else if (ic->ic_flags & IEEE80211_F_WEPON) ni->ni_rsncipher = IEEE80211_CIPHER_USEGROUP; ieee80211_node_newstate(selbs, IEEE80211_STA_BSS); #ifndef IEEE80211_STA_ONLY if (ic->ic_opmode == IEEE80211_M_IBSS) { ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (ni->ni_rates.rs_nrates == 0) { ieee80211_new_state(ic, IEEE80211_S_SCAN, -1); return; } ieee80211_new_state(ic, IEEE80211_S_RUN, -1); } else #endif { int bgscan = ((ic->ic_flags & IEEE80211_F_BGSCAN) && ic->ic_opmode == IEEE80211_M_STA && ic->ic_state == IEEE80211_S_RUN); int auth_next = (ic->ic_opmode == IEEE80211_M_STA && ic->ic_state == IEEE80211_S_AUTH); int mgt = -1; timeout_del(&ic->ic_bgscan_timeout); ic->ic_flags &= ~IEEE80211_F_BGSCAN; /* * After a background scan, we have now switched APs. * Pretend we were just de-authed, which makes * ieee80211_new_state() try to re-auth and thus send * an AUTH frame to our newly selected AP. */ if (bgscan) mgt = IEEE80211_FC0_SUBTYPE_DEAUTH; /* * If we are trying another AP after the previous one * failed (state transition AUTH->AUTH), ensure that * ieee80211_new_state() tries to send another auth frame. */ else if (auth_next) mgt = IEEE80211_FC0_SUBTYPE_AUTH; ieee80211_new_state(ic, IEEE80211_S_AUTH, mgt); } } struct ieee80211_node * ieee80211_node_choose_bss(struct ieee80211com *ic, int bgscan, struct ieee80211_node **curbs) { struct ieee80211_node *ni, *nextbs, *selbs = NULL, *selbs2 = NULL, *selbs5 = NULL; uint8_t min_5ghz_rssi; ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); for (; ni != NULL; ni = nextbs) { nextbs = RBT_NEXT(ieee80211_tree, ni); if (ni->ni_fails) { /* * The configuration of the access points may change * during my scan. So delete the entry for the AP * and retry to associate if there is another beacon. */ if (ni->ni_fails++ > 2) ieee80211_free_node(ic, ni); continue; } if (curbs && ieee80211_node_cmp(ic->ic_bss, ni) == 0) *curbs = ni; if (ieee80211_match_bss(ic, ni, bgscan) != 0) continue; if (ic->ic_caps & IEEE80211_C_SCANALLBAND) { if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan) && (selbs2 == NULL || ni->ni_rssi > selbs2->ni_rssi)) selbs2 = ni; else if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan) && (selbs5 == NULL || ni->ni_rssi > selbs5->ni_rssi)) selbs5 = ni; } else if (selbs == NULL || ni->ni_rssi > selbs->ni_rssi) selbs = ni; } if (ic->ic_max_rssi) min_5ghz_rssi = IEEE80211_RSSI_THRES_RATIO_5GHZ; else min_5ghz_rssi = (uint8_t)IEEE80211_RSSI_THRES_5GHZ; /* * Prefer a 5Ghz AP even if its RSSI is weaker than the best 2Ghz AP * (as long as it meets the minimum RSSI threshold) since the 5Ghz band * is usually less saturated. */ if (selbs5 && selbs5->ni_rssi > min_5ghz_rssi) selbs = selbs5; else if (selbs5 && selbs2) selbs = (selbs5->ni_rssi >= selbs2->ni_rssi ? selbs5 : selbs2); else if (selbs2) selbs = selbs2; else if (selbs5) selbs = selbs5; return selbs; } /* * Complete a scan of potential channels. */ void ieee80211_end_scan(struct ifnet *ifp) { struct ieee80211com *ic = (void *)ifp; struct ieee80211_node *ni, *selbs = NULL, *curbs = NULL; int bgscan = ((ic->ic_flags & IEEE80211_F_BGSCAN) && ic->ic_opmode == IEEE80211_M_STA && ic->ic_state == IEEE80211_S_RUN); if (ifp->if_flags & IFF_DEBUG) printf("%s: end %s scan\n", ifp->if_xname, bgscan ? "background" : ((ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive")); if (ic->ic_scan_count) ic->ic_flags &= ~IEEE80211_F_ASCAN; if (ic->ic_opmode == IEEE80211_M_STA) ieee80211_clean_inactive_nodes(ic, IEEE80211_INACT_SCAN); ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); #ifndef IEEE80211_STA_ONLY if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* XXX off stack? */ u_char occupied[howmany(IEEE80211_CHAN_MAX, NBBY)]; int i, fail; /* * 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 random * channel from the active set. */ memset(occupied, 0, sizeof(occupied)); RBT_FOREACH(ni, ieee80211_tree, &ic->ic_tree) setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan)); for (i = 0; i < IEEE80211_CHAN_MAX; i++) if (isset(ic->ic_chan_active, i) && isclr(occupied, i)) break; if (i == IEEE80211_CHAN_MAX) { fail = arc4random() & 3; /* random 0-3 */ for (i = 0; i < IEEE80211_CHAN_MAX; i++) if (isset(ic->ic_chan_active, i) && fail-- == 0) break; } ieee80211_create_ibss(ic, &ic->ic_channels[i]); return; } #endif if (ni == NULL) { DPRINTF(("no scan candidate\n")); notfound: #ifndef IEEE80211_STA_ONLY 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; } #endif /* * Reset the list of channels to scan and scan the next mode * if nothing has been found. * If the device scans all bands in one fell swoop, return * current scan results to userspace regardless of mode. * This will loop forever until an access point is found. */ ieee80211_reset_scan(ifp); if (ieee80211_next_mode(ifp) == IEEE80211_MODE_AUTO || (ic->ic_caps & IEEE80211_C_SCANALLBAND)) ic->ic_scan_count++; ieee80211_next_scan(ifp); return; } /* Possibly switch which ssid we are associated with */ if (!bgscan && ic->ic_opmode == IEEE80211_M_STA) ieee80211_switch_ess(ic); selbs = ieee80211_node_choose_bss(ic, bgscan, &curbs); if (bgscan) { struct ieee80211_node_switch_bss_arg *arg; /* AP disappeared? Should not happen. */ if (selbs == NULL || curbs == NULL) { ic->ic_flags &= ~IEEE80211_F_BGSCAN; goto notfound; } /* * After a background scan we might end up choosing the * same AP again. Or the newly selected AP's RSSI level * might be low enough to trigger another background scan. * Do not change ic->ic_bss in these cases and make * background scans less frequent. */ if (selbs == curbs || !(*ic->ic_node_checkrssi)(ic, selbs)) { if (ic->ic_bgscan_fail < IEEE80211_BGSCAN_FAIL_MAX) { if (ic->ic_bgscan_fail <= 0) ic->ic_bgscan_fail = 1; else ic->ic_bgscan_fail *= 2; } ic->ic_flags &= ~IEEE80211_F_BGSCAN; return; } arg = malloc(sizeof(*arg), M_DEVBUF, M_NOWAIT | M_ZERO); if (arg == NULL) { ic->ic_flags &= ~IEEE80211_F_BGSCAN; return; } ic->ic_bgscan_fail = 0; /* * We are going to switch APs. Stop A-MPDU Tx and * queue a de-auth frame addressed to our current AP. */ ieee80211_stop_ampdu_tx(ic, ic->ic_bss, IEEE80211_FC0_SUBTYPE_DEAUTH); if (IEEE80211_SEND_MGMT(ic, ic->ic_bss, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_AUTH_LEAVE) != 0) { ic->ic_flags &= ~IEEE80211_F_BGSCAN; free(arg, M_DEVBUF, sizeof(*arg)); return; } /* Prevent dispatch of additional data frames to hardware. */ ic->ic_xflags |= IEEE80211_F_TX_MGMT_ONLY; /* * Install a callback which will switch us to the new AP once * all dispatched frames have been processed by hardware. */ IEEE80211_ADDR_COPY(arg->cur_macaddr, curbs->ni_macaddr); IEEE80211_ADDR_COPY(arg->sel_macaddr, selbs->ni_macaddr); ic->ic_bss->ni_unref_arg = arg; ic->ic_bss->ni_unref_arg_size = sizeof(*arg); ic->ic_bss->ni_unref_cb = ieee80211_node_switch_bss; /* F_BGSCAN flag gets cleared in ieee80211_node_join_bss(). */ return; } else if (selbs == NULL) goto notfound; ieee80211_node_join_bss(ic, selbs); } /* * Autoselect the best RSN parameters (protocol, AKMP, pairwise cipher...) * that are supported by both peers (STA mode only). */ void ieee80211_choose_rsnparams(struct ieee80211com *ic) { struct ieee80211_node *ni = ic->ic_bss; struct ieee80211_pmk *pmk; /* filter out unsupported protocol versions */ ni->ni_rsnprotos &= ic->ic_rsnprotos; /* prefer RSN (aka WPA2) over WPA */ if (ni->ni_rsnprotos & IEEE80211_PROTO_RSN) ni->ni_rsnprotos = IEEE80211_PROTO_RSN; else ni->ni_rsnprotos = IEEE80211_PROTO_WPA; /* filter out unsupported AKMPs */ ni->ni_rsnakms &= ic->ic_rsnakms; /* prefer SHA-256 based AKMPs */ if ((ic->ic_flags & IEEE80211_F_PSK) && (ni->ni_rsnakms & (IEEE80211_AKM_PSK | IEEE80211_AKM_SHA256_PSK))) { /* AP supports PSK AKMP and a PSK is configured */ if (ni->ni_rsnakms & IEEE80211_AKM_SHA256_PSK) ni->ni_rsnakms = IEEE80211_AKM_SHA256_PSK; else ni->ni_rsnakms = IEEE80211_AKM_PSK; } else { if (ni->ni_rsnakms & IEEE80211_AKM_SHA256_8021X) ni->ni_rsnakms = IEEE80211_AKM_SHA256_8021X; else ni->ni_rsnakms = IEEE80211_AKM_8021X; /* check if we have a cached PMK for this AP */ if (ni->ni_rsnprotos == IEEE80211_PROTO_RSN && (pmk = ieee80211_pmksa_find(ic, ni, NULL)) != NULL) { memcpy(ni->ni_pmkid, pmk->pmk_pmkid, IEEE80211_PMKID_LEN); ni->ni_flags |= IEEE80211_NODE_PMKID; } } /* filter out unsupported pairwise ciphers */ ni->ni_rsnciphers &= ic->ic_rsnciphers; /* prefer CCMP over TKIP */ if (ni->ni_rsnciphers & IEEE80211_CIPHER_CCMP) ni->ni_rsnciphers = IEEE80211_CIPHER_CCMP; else ni->ni_rsnciphers = IEEE80211_CIPHER_TKIP; ni->ni_rsncipher = ni->ni_rsnciphers; /* use MFP if we both support it */ if ((ic->ic_caps & IEEE80211_C_MFP) && (ni->ni_rsncaps & IEEE80211_RSNCAP_MFPC)) ni->ni_flags |= IEEE80211_NODE_MFP; } int ieee80211_get_rate(struct ieee80211com *ic) { u_int8_t (*rates)[IEEE80211_RATE_MAXSIZE]; int rate; rates = &ic->ic_bss->ni_rates.rs_rates; if (ic->ic_fixed_rate != -1) rate = (*rates)[ic->ic_fixed_rate]; else if (ic->ic_state == IEEE80211_S_RUN) rate = (*rates)[ic->ic_bss->ni_txrate]; else rate = 0; return rate & IEEE80211_RATE_VAL; } struct ieee80211_node * ieee80211_node_alloc(struct ieee80211com *ic) { return malloc(sizeof(struct ieee80211_node), M_DEVBUF, M_NOWAIT | M_ZERO); } void ieee80211_node_cleanup(struct ieee80211com *ic, struct ieee80211_node *ni) { if (ni->ni_rsnie != NULL) { free(ni->ni_rsnie, M_DEVBUF, 2 + ni->ni_rsnie[1]); ni->ni_rsnie = NULL; } ieee80211_ba_del(ni); ni->ni_unref_cb = NULL; free(ni->ni_unref_arg, M_DEVBUF, ni->ni_unref_arg_size); ni->ni_unref_arg = NULL; ni->ni_unref_arg_size = 0; } void ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni) { ieee80211_node_cleanup(ic, ni); free(ni, M_DEVBUF, 0); } void ieee80211_node_copy(struct ieee80211com *ic, struct ieee80211_node *dst, const struct ieee80211_node *src) { ieee80211_node_cleanup(ic, dst); *dst = *src; dst->ni_rsnie = NULL; if (src->ni_rsnie != NULL) ieee80211_save_ie(src->ni_rsnie, &dst->ni_rsnie); ieee80211_node_set_timeouts(dst); #ifndef IEEE80211_STA_ONLY mq_init(&dst->ni_savedq, IEEE80211_PS_MAX_QUEUE, IPL_NET); #endif } u_int8_t ieee80211_node_getrssi(struct ieee80211com *ic, const struct ieee80211_node *ni) { return ni->ni_rssi; } int ieee80211_node_checkrssi(struct ieee80211com *ic, const struct ieee80211_node *ni) { uint8_t thres; if (ni->ni_chan == IEEE80211_CHAN_ANYC) return 0; if (ic->ic_max_rssi) { thres = (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) ? IEEE80211_RSSI_THRES_RATIO_2GHZ : IEEE80211_RSSI_THRES_RATIO_5GHZ; return ((ni->ni_rssi * 100) / ic->ic_max_rssi >= thres); } thres = (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) ? IEEE80211_RSSI_THRES_2GHZ : IEEE80211_RSSI_THRES_5GHZ; return (ni->ni_rssi >= (u_int8_t)thres); } void ieee80211_node_set_timeouts(struct ieee80211_node *ni) { int i; #ifndef IEEE80211_STA_ONLY timeout_set(&ni->ni_eapol_to, ieee80211_eapol_timeout, ni); timeout_set(&ni->ni_sa_query_to, ieee80211_sa_query_timeout, ni); #endif timeout_set(&ni->ni_addba_req_to[EDCA_AC_BE], ieee80211_node_addba_request_ac_be_to, ni); timeout_set(&ni->ni_addba_req_to[EDCA_AC_BK], ieee80211_node_addba_request_ac_bk_to, ni); timeout_set(&ni->ni_addba_req_to[EDCA_AC_VI], ieee80211_node_addba_request_ac_vi_to, ni); timeout_set(&ni->ni_addba_req_to[EDCA_AC_VO], ieee80211_node_addba_request_ac_vo_to, ni); for (i = 0; i < nitems(ni->ni_addba_req_intval); i++) ni->ni_addba_req_intval[i] = 1; } void ieee80211_setup_node(struct ieee80211com *ic, struct ieee80211_node *ni, const u_int8_t *macaddr) { int i, s; DPRINTF(("%s\n", ether_sprintf((u_int8_t *)macaddr))); IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr); ieee80211_node_newstate(ni, IEEE80211_STA_CACHE); ni->ni_ic = ic; /* back-pointer */ /* Initialize cached last sequence numbers with invalid values. */ ni->ni_rxseq = 0xffffU; for (i=0; i < IEEE80211_NUM_TID; ++i) ni->ni_qos_rxseqs[i] = 0xffffU; #ifndef IEEE80211_STA_ONLY mq_init(&ni->ni_savedq, IEEE80211_PS_MAX_QUEUE, IPL_NET); #endif ieee80211_node_set_timeouts(ni); s = splnet(); RBT_INSERT(ieee80211_tree, &ic->ic_tree, ni); ic->ic_nnodes++; splx(s); } struct ieee80211_node * ieee80211_alloc_node(struct ieee80211com *ic, const u_int8_t *macaddr) { struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic); if (ni != NULL) ieee80211_setup_node(ic, ni, macaddr); else ic->ic_stats.is_rx_nodealloc++; return ni; } struct ieee80211_node * ieee80211_dup_bss(struct ieee80211com *ic, const u_int8_t *macaddr) { struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic); if (ni != NULL) { ieee80211_setup_node(ic, ni, macaddr); /* * Inherit from ic_bss. */ IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); ni->ni_chan = ic->ic_bss->ni_chan; } else ic->ic_stats.is_rx_nodealloc++; return ni; } struct ieee80211_node * ieee80211_find_node(struct ieee80211com *ic, const u_int8_t *macaddr) { struct ieee80211_node *ni; int cmp; /* similar to RBT_FIND except we compare keys, not nodes */ ni = RBT_ROOT(ieee80211_tree, &ic->ic_tree); while (ni != NULL) { cmp = memcmp(macaddr, ni->ni_macaddr, IEEE80211_ADDR_LEN); if (cmp < 0) ni = RBT_LEFT(ieee80211_tree, ni); else if (cmp > 0) ni = RBT_RIGHT(ieee80211_tree, ni); else break; } return ni; } /* * Return a reference to the appropriate node for sending * a data frame. This handles node discovery in adhoc networks. * * Drivers will call this, so increase the reference count before * returning the node. */ struct ieee80211_node * ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr) { #ifndef IEEE80211_STA_ONLY struct ieee80211_node *ni; int s; #endif /* * The destination address should be in the node table * unless we are operating in station mode or this is a * multicast/broadcast frame. */ if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr)) return ieee80211_ref_node(ic->ic_bss); #ifndef IEEE80211_STA_ONLY s = splnet(); ni = ieee80211_find_node(ic, macaddr); splx(s); if (ni == NULL) { if (ic->ic_opmode != IEEE80211_M_IBSS && ic->ic_opmode != IEEE80211_M_AHDEMO) return NULL; /* * 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 its private state. * * XXX need better way to handle this; issue probe * request so we can deduce rate set, etc. */ if ((ni = ieee80211_dup_bss(ic, macaddr)) == NULL) return NULL; /* XXX no rate negotiation; just dup */ ni->ni_rates = ic->ic_bss->ni_rates; ni->ni_txrate = 0; if (ic->ic_newassoc) (*ic->ic_newassoc)(ic, ni, 1); } return ieee80211_ref_node(ni); #else return NULL; /* can't get there */ #endif /* IEEE80211_STA_ONLY */ } /* * It is usually desirable to process a Rx packet using its sender's * node-record instead of the BSS record. * * - AP mode: keep a node-record for every authenticated/associated * station *in the BSS*. For future use, we also track neighboring * APs, since they might belong to the same ESS. APs in the same * ESS may bridge packets to each other, forming a Wireless * Distribution System (WDS). * * - IBSS mode: keep a node-record for every station *in the BSS*. * Also track neighboring stations by their beacons/probe responses. * * - monitor mode: keep a node-record for every sender, regardless * of BSS. * * - STA mode: the only available node-record is the BSS record, * ic->ic_bss. * * Of all the 802.11 Control packets, only the node-records for * RTS packets node-record can be looked up. * * Return non-zero if the packet's node-record is kept, zero * otherwise. */ static __inline int ieee80211_needs_rxnode(struct ieee80211com *ic, const struct ieee80211_frame *wh, const u_int8_t **bssid) { int monitor, rc = 0; monitor = (ic->ic_opmode == IEEE80211_M_MONITOR); *bssid = NULL; switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) { case IEEE80211_FC0_TYPE_CTL: if (!monitor) break; return (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_RTS; case IEEE80211_FC0_TYPE_MGT: *bssid = wh->i_addr3; switch (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) { case IEEE80211_FC0_SUBTYPE_BEACON: case IEEE80211_FC0_SUBTYPE_PROBE_RESP: break; default: #ifndef IEEE80211_STA_ONLY if (ic->ic_opmode == IEEE80211_M_STA) break; rc = IEEE80211_ADDR_EQ(*bssid, ic->ic_bss->ni_bssid) || IEEE80211_ADDR_EQ(*bssid, etherbroadcastaddr); #endif break; } break; case IEEE80211_FC0_TYPE_DATA: switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { case IEEE80211_FC1_DIR_NODS: *bssid = wh->i_addr3; #ifndef IEEE80211_STA_ONLY if (ic->ic_opmode == IEEE80211_M_IBSS || ic->ic_opmode == IEEE80211_M_AHDEMO) rc = IEEE80211_ADDR_EQ(*bssid, ic->ic_bss->ni_bssid); #endif break; case IEEE80211_FC1_DIR_TODS: *bssid = wh->i_addr1; #ifndef IEEE80211_STA_ONLY if (ic->ic_opmode == IEEE80211_M_HOSTAP) rc = IEEE80211_ADDR_EQ(*bssid, ic->ic_bss->ni_bssid); #endif break; case IEEE80211_FC1_DIR_FROMDS: case IEEE80211_FC1_DIR_DSTODS: *bssid = wh->i_addr2; #ifndef IEEE80211_STA_ONLY rc = (ic->ic_opmode == IEEE80211_M_HOSTAP); #endif break; } break; } return monitor || rc; } /* * Drivers call this, so increase the reference count before returning * the node. */ struct ieee80211_node * ieee80211_find_rxnode(struct ieee80211com *ic, const struct ieee80211_frame *wh) { static const u_int8_t zero[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; struct ieee80211_node *ni; const u_int8_t *bssid; int s; if (!ieee80211_needs_rxnode(ic, wh, &bssid)) return ieee80211_ref_node(ic->ic_bss); s = splnet(); ni = ieee80211_find_node(ic, wh->i_addr2); splx(s); if (ni != NULL) return ieee80211_ref_node(ni); #ifndef IEEE80211_STA_ONLY if (ic->ic_opmode == IEEE80211_M_HOSTAP) return ieee80211_ref_node(ic->ic_bss); #endif /* XXX see remarks in ieee80211_find_txnode */ /* XXX no rate negotiation; just dup */ if ((ni = ieee80211_dup_bss(ic, wh->i_addr2)) == NULL) return ieee80211_ref_node(ic->ic_bss); IEEE80211_ADDR_COPY(ni->ni_bssid, (bssid != NULL) ? bssid : zero); ni->ni_rates = ic->ic_bss->ni_rates; ni->ni_txrate = 0; if (ic->ic_newassoc) (*ic->ic_newassoc)(ic, ni, 1); DPRINTF(("faked-up node %p for %s\n", ni, ether_sprintf((u_int8_t *)wh->i_addr2))); return ieee80211_ref_node(ni); } struct ieee80211_node * ieee80211_find_node_for_beacon(struct ieee80211com *ic, const u_int8_t *macaddr, const struct ieee80211_channel *chan, const char *ssid, u_int8_t rssi) { struct ieee80211_node *ni, *keep = NULL; int s, score = 0; if ((ni = ieee80211_find_node(ic, macaddr)) != NULL) { s = splnet(); if (ni->ni_chan != chan && ni->ni_rssi >= rssi) score++; if (ssid[1] == 0 && ni->ni_esslen != 0) score++; if (score > 0) keep = ni; splx(s); } return (keep); } void ieee80211_ba_del(struct ieee80211_node *ni) { int tid; for (tid = 0; tid < nitems(ni->ni_rx_ba); tid++) { struct ieee80211_rx_ba *ba = &ni->ni_rx_ba[tid]; if (ba->ba_state != IEEE80211_BA_INIT) { if (timeout_pending(&ba->ba_to)) timeout_del(&ba->ba_to); if (timeout_pending(&ba->ba_gap_to)) timeout_del(&ba->ba_gap_to); ba->ba_state = IEEE80211_BA_INIT; } } for (tid = 0; tid < nitems(ni->ni_tx_ba); tid++) { struct ieee80211_tx_ba *ba = &ni->ni_tx_ba[tid]; if (ba->ba_state != IEEE80211_BA_INIT) { if (timeout_pending(&ba->ba_to)) timeout_del(&ba->ba_to); ba->ba_state = IEEE80211_BA_INIT; } } timeout_del(&ni->ni_addba_req_to[EDCA_AC_BE]); timeout_del(&ni->ni_addba_req_to[EDCA_AC_BK]); timeout_del(&ni->ni_addba_req_to[EDCA_AC_VI]); timeout_del(&ni->ni_addba_req_to[EDCA_AC_VO]); } void ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni) { if (ni == ic->ic_bss) panic("freeing bss node"); splassert(IPL_NET); DPRINTF(("%s\n", ether_sprintf(ni->ni_macaddr))); #ifndef IEEE80211_STA_ONLY timeout_del(&ni->ni_eapol_to); timeout_del(&ni->ni_sa_query_to); IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap); #endif ieee80211_ba_del(ni); RBT_REMOVE(ieee80211_tree, &ic->ic_tree, ni); ic->ic_nnodes--; #ifndef IEEE80211_STA_ONLY if (mq_purge(&ni->ni_savedq) > 0) { if (ic->ic_set_tim != NULL) (*ic->ic_set_tim)(ic, ni->ni_associd, 0); } #endif (*ic->ic_node_free)(ic, ni); /* TBD indicate to drivers that a new node can be allocated */ } void ieee80211_release_node(struct ieee80211com *ic, struct ieee80211_node *ni) { int s; DPRINTF(("%s refcnt %u\n", ether_sprintf(ni->ni_macaddr), ni->ni_refcnt)); s = splnet(); if (ieee80211_node_decref(ni) == 0) { if (ni->ni_unref_cb) { (*ni->ni_unref_cb)(ic, ni); ni->ni_unref_cb = NULL; /* Freed by callback if necessary: */ ni->ni_unref_arg = NULL; ni->ni_unref_arg_size = 0; } if (ni->ni_state == IEEE80211_STA_COLLECT) ieee80211_free_node(ic, ni); } splx(s); } void ieee80211_free_allnodes(struct ieee80211com *ic, int clear_ic_bss) { struct ieee80211_node *ni; int s; DPRINTF(("freeing all nodes\n")); s = splnet(); while ((ni = RBT_MIN(ieee80211_tree, &ic->ic_tree)) != NULL) ieee80211_free_node(ic, ni); splx(s); if (clear_ic_bss && ic->ic_bss != NULL) ieee80211_node_cleanup(ic, ic->ic_bss); /* for station mode */ } void ieee80211_clean_cached(struct ieee80211com *ic) { struct ieee80211_node *ni, *next_ni; int s; s = splnet(); for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); ni != NULL; ni = next_ni) { next_ni = RBT_NEXT(ieee80211_tree, ni); if (ni->ni_state == IEEE80211_STA_CACHE) ieee80211_free_node(ic, ni); } splx(s); } /* * Timeout inactive nodes. * * If called because of a cache timeout, which happens only in hostap and ibss * modes, clean all inactive cached or authenticated nodes but don't de-auth * any associated nodes. Also update HT protection settings. * * Else, this function is called because a new node must be allocated but the * node cache is full. In this case, return as soon as a free slot was made * available. If acting as hostap, clean cached nodes regardless of their * recent activity and also allow de-authing of authenticated nodes older * than one cache wait interval, and de-authing of inactive associated nodes. */ void ieee80211_clean_nodes(struct ieee80211com *ic, int cache_timeout) { struct ieee80211_node *ni, *next_ni; u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/ int s; #ifndef IEEE80211_STA_ONLY int nnodes = 0, nonht = 0, nonhtassoc = 0; struct ifnet *ifp = &ic->ic_if; enum ieee80211_htprot htprot = IEEE80211_HTPROT_NONE; enum ieee80211_protmode protmode = IEEE80211_PROT_NONE; #endif s = splnet(); for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); ni != NULL; ni = next_ni) { next_ni = RBT_NEXT(ieee80211_tree, ni); if (!cache_timeout && ic->ic_nnodes < ic->ic_max_nnodes) break; if (ni->ni_scangen == gen) /* previously handled */ continue; #ifndef IEEE80211_STA_ONLY nnodes++; if ((ic->ic_flags & IEEE80211_F_HTON) && cache_timeout) { /* * Check if node supports 802.11n. * Only require HT capabilities IE for this check. * Nodes might never reveal their supported MCS to us * unless they go through a full association sequence. * ieee80211_node_supports_ht() could misclassify them. */ if ((ni->ni_flags & IEEE80211_NODE_HTCAP) == 0) { nonht++; if (ni->ni_state == IEEE80211_STA_ASSOC) nonhtassoc++; } } #endif ni->ni_scangen = gen; if (ni->ni_refcnt > 0) continue; #ifndef IEEE80211_STA_ONLY if ((ic->ic_opmode == IEEE80211_M_HOSTAP || ic->ic_opmode == IEEE80211_M_IBSS) && ic->ic_state == IEEE80211_S_RUN) { if (cache_timeout) { if (ni->ni_state != IEEE80211_STA_COLLECT && (ni->ni_state == IEEE80211_STA_ASSOC || ni->ni_inact < IEEE80211_INACT_MAX)) continue; } else { if (ic->ic_opmode == IEEE80211_M_HOSTAP && ((ni->ni_state == IEEE80211_STA_ASSOC && ni->ni_inact < IEEE80211_INACT_MAX) || (ni->ni_state == IEEE80211_STA_AUTH && ni->ni_inact == 0))) continue; if (ic->ic_opmode == IEEE80211_M_IBSS && ni->ni_state != IEEE80211_STA_COLLECT && ni->ni_state != IEEE80211_STA_CACHE && ni->ni_inact < IEEE80211_INACT_MAX) continue; } } if (ifp->if_flags & IFF_DEBUG) printf("%s: station %s purged from node cache\n", ifp->if_xname, ether_sprintf(ni->ni_macaddr)); #endif /* * If we're hostap and the node is authenticated, send * a deauthentication frame. The node will be freed when * the driver calls ieee80211_release_node(). */ #ifndef IEEE80211_STA_ONLY nnodes--; if ((ic->ic_flags & IEEE80211_F_HTON) && cache_timeout) { if ((ni->ni_flags & IEEE80211_NODE_HTCAP) == 0) { nonht--; if (ni->ni_state == IEEE80211_STA_ASSOC) nonhtassoc--; } } if (ic->ic_opmode == IEEE80211_M_HOSTAP && ni->ni_state >= IEEE80211_STA_AUTH && ni->ni_state != IEEE80211_STA_COLLECT) { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_AUTH_EXPIRE); ieee80211_node_leave(ic, ni); } else #endif ieee80211_free_node(ic, ni); ic->ic_stats.is_node_timeout++; } #ifndef IEEE80211_STA_ONLY if ((ic->ic_flags & IEEE80211_F_HTON) && cache_timeout) { uint16_t htop1 = ic->ic_bss->ni_htop1; /* Update HT protection settings. */ if (nonht) { protmode = IEEE80211_PROT_CTSONLY; if (nonhtassoc) htprot = IEEE80211_HTPROT_NONHT_MIXED; else htprot = IEEE80211_HTPROT_NONMEMBER; } if ((htop1 & IEEE80211_HTOP1_PROT_MASK) != htprot) { htop1 &= ~IEEE80211_HTOP1_PROT_MASK; htop1 |= htprot; ic->ic_bss->ni_htop1 = htop1; ic->ic_protmode = protmode; if (ic->ic_update_htprot) ic->ic_update_htprot(ic, ic->ic_bss); } } /* * During a cache timeout we iterate over all nodes. * Check for node leaks by comparing the actual number of cached * nodes with the ic_nnodes count, which is maintained while adding * and removing nodes from the cache. */ if ((ifp->if_flags & IFF_DEBUG) && cache_timeout && nnodes != ic->ic_nnodes) printf("%s: number of cached nodes is %d, expected %d," "possible nodes leak\n", ifp->if_xname, nnodes, ic->ic_nnodes); #endif splx(s); } void ieee80211_clean_inactive_nodes(struct ieee80211com *ic, int inact_max) { struct ieee80211_node *ni, *next_ni; u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/ int s; s = splnet(); for (ni = RBT_MIN(ieee80211_tree, &ic->ic_tree); ni != NULL; ni = next_ni) { next_ni = RBT_NEXT(ieee80211_tree, ni); if (ni->ni_scangen == gen) /* previously handled */ continue; ni->ni_scangen = gen; if (ni->ni_refcnt > 0 || ni->ni_inact < inact_max) continue; ieee80211_free_node(ic, ni); ic->ic_stats.is_node_timeout++; } splx(s); } void ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f, void *arg) { struct ieee80211_node *ni; int s; s = splnet(); RBT_FOREACH(ni, ieee80211_tree, &ic->ic_tree) (*f)(arg, ni); splx(s); } /* * Install received HT caps information in the node's state block. */ void ieee80211_setup_htcaps(struct ieee80211_node *ni, const uint8_t *data, uint8_t len) { uint16_t rxrate; if (len != 26) return; ni->ni_htcaps = (data[0] | (data[1] << 8)); ni->ni_ampdu_param = data[2]; memcpy(ni->ni_rxmcs, &data[3], sizeof(ni->ni_rxmcs)); /* clear reserved bits */ clrbit(ni->ni_rxmcs, 77); clrbit(ni->ni_rxmcs, 78); clrbit(ni->ni_rxmcs, 79); /* Max MCS Rx rate in 1Mb/s units (0 means "not specified"). */ rxrate = ((data[13] | (data[14]) << 8) & IEEE80211_MCS_RX_RATE_HIGH); if (rxrate < 1024) ni->ni_max_rxrate = rxrate; ni->ni_tx_mcs_set = data[15]; ni->ni_htxcaps = (data[19] | (data[20] << 8)); ni->ni_txbfcaps = (data[21] | (data[22] << 8) | (data[23] << 16) | (data[24] << 24)); ni->ni_aselcaps = data[25]; ni->ni_flags |= IEEE80211_NODE_HTCAP; } #ifndef IEEE80211_STA_ONLY /* * Handle nodes switching from 11n into legacy modes. */ void ieee80211_clear_htcaps(struct ieee80211_node *ni) { ni->ni_htcaps = 0; ni->ni_ampdu_param = 0; memset(ni->ni_rxmcs, 0, sizeof(ni->ni_rxmcs)); ni->ni_max_rxrate = 0; ni->ni_tx_mcs_set = 0; ni->ni_htxcaps = 0; ni->ni_txbfcaps = 0; ni->ni_aselcaps = 0; ni->ni_flags &= ~(IEEE80211_NODE_HT | IEEE80211_NODE_HT_SGI20 | IEEE80211_NODE_HT_SGI40 | IEEE80211_NODE_HTCAP); } #endif /* * Install received HT op information in the node's state block. */ int ieee80211_setup_htop(struct ieee80211_node *ni, const uint8_t *data, uint8_t len, int isprobe) { if (len != 22) return 0; ni->ni_primary_chan = data[0]; /* XXX corresponds to ni_chan */ ni->ni_htop0 = data[1]; ni->ni_htop1 = (data[2] | (data[3] << 8)); ni->ni_htop2 = (data[3] | (data[4] << 8)); /* * According to 802.11-2012 Table 8-130 the Basic MCS set is * only "present in Beacon, Probe Response, Mesh Peering Open * and Mesh Peering Confirm frames. Otherwise reserved." */ if (isprobe) memcpy(ni->ni_basic_mcs, &data[6], sizeof(ni->ni_basic_mcs)); return 1; } /* * Install received rate set information in the node's state block. */ int ieee80211_setup_rates(struct ieee80211com *ic, struct ieee80211_node *ni, const u_int8_t *rates, const u_int8_t *xrates, int flags) { struct ieee80211_rateset *rs = &ni->ni_rates; memset(rs, 0, sizeof(*rs)); rs->rs_nrates = rates[1]; memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); if (xrates != NULL) { u_int8_t nxrates; /* * Tack on 11g extended supported rate element. */ nxrates = xrates[1]; if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; DPRINTF(("extended rate set too large; " "only using %u of %u rates\n", nxrates, xrates[1])); ic->ic_stats.is_rx_rstoobig++; } memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); rs->rs_nrates += nxrates; } return ieee80211_fix_rate(ic, ni, flags); } void ieee80211_node_trigger_addba_req(struct ieee80211_node *ni, int tid) { if (ni->ni_tx_ba[tid].ba_state == IEEE80211_BA_INIT && !timeout_pending(&ni->ni_addba_req_to[tid])) { timeout_add_sec(&ni->ni_addba_req_to[tid], ni->ni_addba_req_intval[tid]); } } void ieee80211_node_addba_request(struct ieee80211_node *ni, int tid) { struct ieee80211com *ic = ni->ni_ic; uint16_t ssn = ni->ni_qos_txseqs[tid]; ieee80211_addba_request(ic, ni, ssn, tid); } void ieee80211_node_addba_request_ac_be_to(void *arg) { struct ieee80211_node *ni = arg; ieee80211_node_addba_request(ni, EDCA_AC_BE); } void ieee80211_node_addba_request_ac_bk_to(void *arg) { struct ieee80211_node *ni = arg; ieee80211_node_addba_request(ni, EDCA_AC_BK); } void ieee80211_node_addba_request_ac_vi_to(void *arg) { struct ieee80211_node *ni = arg; ieee80211_node_addba_request(ni, EDCA_AC_VI); } void ieee80211_node_addba_request_ac_vo_to(void *arg) { struct ieee80211_node *ni = arg; ieee80211_node_addba_request(ni, EDCA_AC_VO); } #ifndef IEEE80211_STA_ONLY /* * Check if the specified node supports ERP. */ int ieee80211_iserp_sta(const struct ieee80211_node *ni) { static const u_int8_t rates[] = { 2, 4, 11, 22, 12, 24, 48 }; const struct ieee80211_rateset *rs = &ni->ni_rates; int i, j; /* * A STA supports ERP operation if it includes all the Clause 19 * mandatory rates in its supported rate set. */ for (i = 0; i < nitems(rates); i++) { for (j = 0; j < rs->rs_nrates; j++) { if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == rates[i]) break; } if (j == rs->rs_nrates) return 0; } return 1; } /* * This function is called to notify the 802.1X PACP machine that a new * 802.1X port is enabled and must be authenticated. For 802.11, a port * becomes enabled whenever a STA successfully completes Open System * authentication with an AP. */ void ieee80211_needs_auth(struct ieee80211com *ic, struct ieee80211_node *ni) { /* * XXX this could be done via the route socket of via a dedicated * EAP socket or another kernel->userland notification mechanism. * The notification should include the MAC address (ni_macaddr). */ } /* * Handle an HT STA joining an HT network. */ void ieee80211_node_join_ht(struct ieee80211com *ic, struct ieee80211_node *ni) { enum ieee80211_htprot; /* Update HT protection setting. */ if ((ni->ni_flags & IEEE80211_NODE_HT) == 0) { uint16_t htop1 = ic->ic_bss->ni_htop1; htop1 &= ~IEEE80211_HTOP1_PROT_MASK; htop1 |= IEEE80211_HTPROT_NONHT_MIXED; ic->ic_bss->ni_htop1 = htop1; if (ic->ic_update_htprot) ic->ic_update_htprot(ic, ic->ic_bss); } } /* * Handle a station joining an RSN network. */ void ieee80211_node_join_rsn(struct ieee80211com *ic, struct ieee80211_node *ni) { DPRINTF(("station %s associated using proto %d akm 0x%x " "cipher 0x%x groupcipher 0x%x\n", ether_sprintf(ni->ni_macaddr), ni->ni_rsnprotos, ni->ni_rsnakms, ni->ni_rsnciphers, ni->ni_rsngroupcipher)); ni->ni_rsn_state = RSNA_AUTHENTICATION; ni->ni_key_count = 0; ni->ni_port_valid = 0; ni->ni_flags &= ~IEEE80211_NODE_TXRXPROT; ni->ni_flags &= ~IEEE80211_NODE_RSN_NEW_PTK; ni->ni_replaycnt = -1; /* XXX */ ni->ni_rsn_retries = 0; ni->ni_rsncipher = ni->ni_rsnciphers; ni->ni_rsn_state = RSNA_AUTHENTICATION_2; /* generate a new authenticator nonce (ANonce) */ arc4random_buf(ni->ni_nonce, EAPOL_KEY_NONCE_LEN); if (!ieee80211_is_8021x_akm(ni->ni_rsnakms)) { memcpy(ni->ni_pmk, ic->ic_psk, IEEE80211_PMK_LEN); ni->ni_flags |= IEEE80211_NODE_PMK; (void)ieee80211_send_4way_msg1(ic, ni); } else if (ni->ni_flags & IEEE80211_NODE_PMK) { /* skip 802.1X auth if a cached PMK was found */ (void)ieee80211_send_4way_msg1(ic, ni); } else { /* no cached PMK found, needs full 802.1X auth */ ieee80211_needs_auth(ic, ni); } } void ieee80211_count_longslotsta(void *arg, struct ieee80211_node *ni) { int *longslotsta = arg; if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) return; if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) (*longslotsta)++; } void ieee80211_count_nonerpsta(void *arg, struct ieee80211_node *ni) { int *nonerpsta = arg; if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) return; if (!ieee80211_iserp_sta(ni)) (*nonerpsta)++; } void ieee80211_count_pssta(void *arg, struct ieee80211_node *ni) { int *pssta = arg; if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) return; if (ni->ni_pwrsave == IEEE80211_PS_DOZE) (*pssta)++; } void ieee80211_count_rekeysta(void *arg, struct ieee80211_node *ni) { int *rekeysta = arg; if (ni->ni_associd == 0 || ni->ni_state == IEEE80211_STA_COLLECT) return; if (ni->ni_flags & IEEE80211_NODE_REKEY) (*rekeysta)++; } /* * Handle a station joining an 11g network. */ void ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni) { int longslotsta = 0, nonerpsta = 0; if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { /* * Joining STA doesn't support short slot time. We must * disable the use of short slot time for all other associated * STAs and give the driver a chance to reconfigure the * hardware. */ ieee80211_iterate_nodes(ic, ieee80211_count_longslotsta, &longslotsta); if (longslotsta == 1) { if (ic->ic_caps & IEEE80211_C_SHSLOT) ieee80211_set_shortslottime(ic, 0); } DPRINTF(("[%s] station needs long slot time, count %d\n", ether_sprintf(ni->ni_macaddr), longslotsta)); } if (!ieee80211_iserp_sta(ni)) { /* * Joining STA is non-ERP. */ ieee80211_iterate_nodes(ic, ieee80211_count_nonerpsta, &nonerpsta); DPRINTF(("[%s] station is non-ERP, %d non-ERP " "stations associated\n", ether_sprintf(ni->ni_macaddr), nonerpsta)); /* must enable the use of protection */ if (ic->ic_protmode != IEEE80211_PROT_NONE) { DPRINTF(("enable use of protection\n")); ic->ic_flags |= IEEE80211_F_USEPROT; } if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 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 = (ni->ni_state != IEEE80211_STA_ASSOC); if (ni->ni_associd == 0) { u_int16_t aid; /* * It would be clever 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); if (ic->ic_curmode == IEEE80211_MODE_11G || (ic->ic_curmode == IEEE80211_MODE_11N && IEEE80211_IS_CHAN_2GHZ(ic->ic_bss->ni_chan))) ieee80211_node_join_11g(ic, ni); } DPRINTF(("station %s %s associated at aid %d\n", ether_sprintf(ni->ni_macaddr), newassoc ? "newly" : "already", ni->ni_associd & ~0xc000)); ieee80211_ht_negotiate(ic, ni); if (ic->ic_flags & IEEE80211_F_HTON) ieee80211_node_join_ht(ic, ni); /* give driver a chance to setup state like ni_txrate */ if (ic->ic_newassoc) (*ic->ic_newassoc)(ic, ni, newassoc); IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS); ieee80211_node_newstate(ni, IEEE80211_STA_ASSOC); if (!(ic->ic_flags & IEEE80211_F_RSNON)) { ni->ni_port_valid = 1; ni->ni_rsncipher = IEEE80211_CIPHER_USEGROUP; } else ieee80211_node_join_rsn(ic, ni); #if NBRIDGE > 0 /* * If the parent interface is a bridge port, learn * the node's address dynamically on this interface. */ if (ic->ic_if.if_bridgeidx != 0) bridge_update(&ic->ic_if, (struct ether_addr *)ni->ni_macaddr, 0); #endif } /* * Handle an HT STA leaving an HT network. */ void ieee80211_node_leave_ht(struct ieee80211com *ic, struct ieee80211_node *ni) { struct ieee80211_rx_ba *ba; u_int8_t tid; int i; /* free all Block Ack records */ ieee80211_ba_del(ni); for (tid = 0; tid < IEEE80211_NUM_TID; tid++) { ba = &ni->ni_rx_ba[tid]; if (ba->ba_buf != NULL) { for (i = 0; i < IEEE80211_BA_MAX_WINSZ; i++) m_freem(ba->ba_buf[i].m); free(ba->ba_buf, M_DEVBUF, IEEE80211_BA_MAX_WINSZ * sizeof(*ba->ba_buf)); ba->ba_buf = NULL; } } ieee80211_clear_htcaps(ni); } /* * Handle a station leaving an RSN network. */ void ieee80211_node_leave_rsn(struct ieee80211com *ic, struct ieee80211_node *ni) { int rekeysta = 0; ni->ni_rsn_state = RSNA_DISCONNECTED; ni->ni_rsn_state = RSNA_INITIALIZE; if (ni->ni_flags & IEEE80211_NODE_REKEY) { ni->ni_flags &= ~IEEE80211_NODE_REKEY; ieee80211_iterate_nodes(ic, ieee80211_count_rekeysta, &rekeysta); if (rekeysta == 0) ieee80211_setkeysdone(ic); } ni->ni_flags &= ~IEEE80211_NODE_PMK; ni->ni_rsn_gstate = RSNA_IDLE; timeout_del(&ni->ni_eapol_to); timeout_del(&ni->ni_sa_query_to); ni->ni_rsn_retries = 0; ni->ni_flags &= ~IEEE80211_NODE_TXRXPROT; ni->ni_port_valid = 0; (*ic->ic_delete_key)(ic, ni, &ni->ni_pairwise_key); } /* * Handle a station leaving an 11g network. */ void ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni) { int longslotsta = 0, nonerpsta = 0; if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { /* leaving STA did not support short slot time */ ieee80211_iterate_nodes(ic, ieee80211_count_longslotsta, &longslotsta); if (longslotsta == 1) { /* * All associated STAs now support short slot time, so * enable this feature and give the driver a chance to * reconfigure the hardware. Notice that IBSS always * use a long slot time. */ if ((ic->ic_caps & IEEE80211_C_SHSLOT) && ic->ic_opmode != IEEE80211_M_IBSS) ieee80211_set_shortslottime(ic, 1); } DPRINTF(("[%s] long slot time station leaves, count %d\n", ether_sprintf(ni->ni_macaddr), longslotsta)); } if (!(ni->ni_flags & IEEE80211_NODE_ERP)) { /* leaving STA was non-ERP */ ieee80211_iterate_nodes(ic, ieee80211_count_nonerpsta, &nonerpsta); if (nonerpsta == 1) { /* * All associated STAs are now ERP capable, disable use * of protection and re-enable short preamble support. */ ic->ic_flags &= ~IEEE80211_F_USEPROT; if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) ic->ic_flags |= IEEE80211_F_SHPREAMBLE; } DPRINTF(("[%s] non-ERP station leaves, count %d\n", ether_sprintf(ni->ni_macaddr), nonerpsta)); } } /* * Handle bookkeeping for station deauthentication/disassociation * when operating as an ap. */ void ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) { if (ic->ic_opmode != IEEE80211_M_HOSTAP) panic("not in ap mode, mode %u", ic->ic_opmode); if (ni->ni_state == IEEE80211_STA_COLLECT) return; /* * If node wasn't previously associated all we need to do is * reclaim the reference. */ if (ni->ni_associd == 0) { ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT); return; } if (ni->ni_pwrsave == IEEE80211_PS_DOZE) ni->ni_pwrsave = IEEE80211_PS_AWAKE; if (mq_purge(&ni->ni_savedq) > 0) { if (ic->ic_set_tim != NULL) (*ic->ic_set_tim)(ic, ni->ni_associd, 0); } if (ic->ic_flags & IEEE80211_F_RSNON) ieee80211_node_leave_rsn(ic, ni); if (ic->ic_curmode == IEEE80211_MODE_11G || (ic->ic_curmode == IEEE80211_MODE_11N && IEEE80211_IS_CHAN_2GHZ(ic->ic_bss->ni_chan))) ieee80211_node_leave_11g(ic, ni); if (ni->ni_flags & IEEE80211_NODE_HT) ieee80211_node_leave_ht(ic, ni); if (ic->ic_node_leave != NULL) (*ic->ic_node_leave)(ic, ni); ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT); #if NBRIDGE > 0 /* * If the parent interface is a bridge port, delete * any dynamically learned address for this node. */ if (ic->ic_if.if_bridgeidx != 0) bridge_update(&ic->ic_if, (struct ether_addr *)ni->ni_macaddr, 1); #endif } static int ieee80211_do_slow_print(struct ieee80211com *ic, int *did_print) { static const struct timeval merge_print_intvl = { .tv_sec = 1, .tv_usec = 0 }; if ((ic->ic_if.if_flags & IFF_LINK0) == 0) return 0; if (!*did_print && (ic->ic_if.if_flags & IFF_DEBUG) == 0 && !ratecheck(&ic->ic_last_merge_print, &merge_print_intvl)) return 0; *did_print = 1; return 1; } /* ieee80211_ibss_merge helps merge 802.11 ad hoc networks. 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. * * Return ENETRESET if the BSSID changed, 0 otherwise. * * XXX Perhaps we should compensate for the time that elapses * between the MAC receiving the beacon and the host processing it * in ieee80211_ibss_merge. */ int ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni, u_int64_t local_tsft) { u_int64_t beacon_tsft; int did_print = 0, sign; union { u_int64_t word; u_int8_t tstamp[8]; } u; /* ensure alignment */ (void)memcpy(&u, &ni->ni_tstamp[0], sizeof(u)); beacon_tsft = letoh64(u.word); /* we are faster, let the other guy catch up */ if (beacon_tsft < local_tsft) sign = -1; else sign = 1; if (IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) { if (!ieee80211_do_slow_print(ic, &did_print)) return 0; printf("%s: tsft offset %s%llu\n", ic->ic_if.if_xname, (sign < 0) ? "-" : "", (sign < 0) ? (local_tsft - beacon_tsft) : (beacon_tsft - local_tsft)); return 0; } if (sign < 0) return 0; if (ieee80211_match_bss(ic, ni, 0) != 0) return 0; if (ieee80211_do_slow_print(ic, &did_print)) { printf("%s: ieee80211_ibss_merge: bssid mismatch %s\n", ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid)); printf("%s: my tsft %llu beacon tsft %llu\n", ic->ic_if.if_xname, local_tsft, beacon_tsft); printf("%s: sync TSF with %s\n", ic->ic_if.if_xname, ether_sprintf(ni->ni_macaddr)); } ic->ic_flags &= ~IEEE80211_F_SIBSS; /* negotiate rates with new IBSS */ ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (ni->ni_rates.rs_nrates == 0) { if (ieee80211_do_slow_print(ic, &did_print)) { printf("%s: rates mismatch, BSSID %s\n", ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid)); } return 0; } if (ieee80211_do_slow_print(ic, &did_print)) { printf("%s: sync BSSID %s -> ", ic->ic_if.if_xname, ether_sprintf(ic->ic_bss->ni_bssid)); printf("%s ", ether_sprintf(ni->ni_bssid)); printf("(from %s)\n", ether_sprintf(ni->ni_macaddr)); } ieee80211_node_newstate(ni, IEEE80211_STA_BSS); (*ic->ic_node_copy)(ic, ic->ic_bss, ni); return ENETRESET; } void ieee80211_set_tim(struct ieee80211com *ic, int aid, int set) { if (set) setbit(ic->ic_tim_bitmap, aid & ~0xc000); else clrbit(ic->ic_tim_bitmap, aid & ~0xc000); } /* * This function shall be called by drivers immediately after every DTIM. * Transmit all group addressed MSDUs buffered at the AP. */ void ieee80211_notify_dtim(struct ieee80211com *ic) { /* NB: group addressed MSDUs are buffered in ic_bss */ struct ieee80211_node *ni = ic->ic_bss; struct ifnet *ifp = &ic->ic_if; struct ieee80211_frame *wh; struct mbuf *m; KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP); while ((m = mq_dequeue(&ni->ni_savedq)) != NULL) { if (!mq_empty(&ni->ni_savedq)) { /* more queued frames, set the more data bit */ wh = mtod(m, struct ieee80211_frame *); wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; } mq_enqueue(&ic->ic_pwrsaveq, m); if_start(ifp); } /* XXX assumes everything has been sent */ ic->ic_tim_mcast_pending = 0; } #endif /* IEEE80211_STA_ONLY */ /* * Compare nodes in the tree by lladdr */ int ieee80211_node_cmp(const struct ieee80211_node *b1, const struct ieee80211_node *b2) { return (memcmp(b1->ni_macaddr, b2->ni_macaddr, IEEE80211_ADDR_LEN)); } /* * Compare nodes in the tree by essid */ int ieee80211_ess_cmp(const struct ieee80211_ess_rbt *b1, const struct ieee80211_ess_rbt *b2) { return (memcmp(b1->essid, b2->essid, IEEE80211_NWID_LEN)); } /* * Generate red-black tree function logic */ RBT_GENERATE(ieee80211_tree, ieee80211_node, ni_node, ieee80211_node_cmp); RBT_GENERATE(ieee80211_ess_tree, ieee80211_ess_rbt, ess_rbt, ieee80211_ess_cmp);