/* * BSS table * Copyright (c) 2009-2019, Jouni Malinen * * This software may be distributed under the terms of the BSD license. * See README for more details. */ #include "utils/includes.h" #include "utils/common.h" #include "utils/eloop.h" #include "common/ieee802_11_defs.h" #include "drivers/driver.h" #include "eap_peer/eap.h" #include "wpa_supplicant_i.h" #include "config.h" #include "notify.h" #include "scan.h" #include "bss.h" static void wpa_bss_set_hessid(struct wpa_bss *bss) { #ifdef CONFIG_INTERWORKING const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING); if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) { os_memset(bss->hessid, 0, ETH_ALEN); return; } if (ie[1] == 7) os_memcpy(bss->hessid, ie + 3, ETH_ALEN); else os_memcpy(bss->hessid, ie + 5, ETH_ALEN); #endif /* CONFIG_INTERWORKING */ } /** * wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry * Returns: Allocated ANQP data structure or %NULL on failure * * The allocated ANQP data structure has its users count set to 1. It may be * shared by multiple BSS entries and each shared entry is freed with * wpa_bss_anqp_free(). */ struct wpa_bss_anqp * wpa_bss_anqp_alloc(void) { struct wpa_bss_anqp *anqp; anqp = os_zalloc(sizeof(*anqp)); if (anqp == NULL) return NULL; #ifdef CONFIG_INTERWORKING dl_list_init(&anqp->anqp_elems); #endif /* CONFIG_INTERWORKING */ anqp->users = 1; return anqp; } /** * wpa_bss_anqp_clone - Clone an ANQP data structure * @anqp: ANQP data structure from wpa_bss_anqp_alloc() * Returns: Cloned ANQP data structure or %NULL on failure */ static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp) { struct wpa_bss_anqp *n; n = os_zalloc(sizeof(*n)); if (n == NULL) return NULL; #define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f) #ifdef CONFIG_INTERWORKING dl_list_init(&n->anqp_elems); ANQP_DUP(capability_list); ANQP_DUP(venue_name); ANQP_DUP(network_auth_type); ANQP_DUP(roaming_consortium); ANQP_DUP(ip_addr_type_availability); ANQP_DUP(nai_realm); ANQP_DUP(anqp_3gpp); ANQP_DUP(domain_name); ANQP_DUP(fils_realm_info); #endif /* CONFIG_INTERWORKING */ #ifdef CONFIG_HS20 ANQP_DUP(hs20_capability_list); ANQP_DUP(hs20_operator_friendly_name); ANQP_DUP(hs20_wan_metrics); ANQP_DUP(hs20_connection_capability); ANQP_DUP(hs20_operating_class); ANQP_DUP(hs20_osu_providers_list); ANQP_DUP(hs20_operator_icon_metadata); ANQP_DUP(hs20_osu_providers_nai_list); #endif /* CONFIG_HS20 */ #undef ANQP_DUP return n; } /** * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry * @bss: BSS entry * Returns: 0 on success, -1 on failure * * This function ensures the specific BSS entry has an ANQP data structure that * is not shared with any other BSS entry. */ int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss) { struct wpa_bss_anqp *anqp; if (bss->anqp && bss->anqp->users > 1) { /* allocated, but shared - clone an unshared copy */ anqp = wpa_bss_anqp_clone(bss->anqp); if (anqp == NULL) return -1; anqp->users = 1; bss->anqp->users--; bss->anqp = anqp; return 0; } if (bss->anqp) return 0; /* already allocated and not shared */ /* not allocated - allocate a new storage area */ bss->anqp = wpa_bss_anqp_alloc(); return bss->anqp ? 0 : -1; } /** * wpa_bss_anqp_free - Free an ANQP data structure * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone() */ static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp) { #ifdef CONFIG_INTERWORKING struct wpa_bss_anqp_elem *elem; #endif /* CONFIG_INTERWORKING */ if (anqp == NULL) return; anqp->users--; if (anqp->users > 0) { /* Another BSS entry holds a pointer to this ANQP info */ return; } #ifdef CONFIG_INTERWORKING wpabuf_free(anqp->capability_list); wpabuf_free(anqp->venue_name); wpabuf_free(anqp->network_auth_type); wpabuf_free(anqp->roaming_consortium); wpabuf_free(anqp->ip_addr_type_availability); wpabuf_free(anqp->nai_realm); wpabuf_free(anqp->anqp_3gpp); wpabuf_free(anqp->domain_name); wpabuf_free(anqp->fils_realm_info); while ((elem = dl_list_first(&anqp->anqp_elems, struct wpa_bss_anqp_elem, list))) { dl_list_del(&elem->list); wpabuf_free(elem->payload); os_free(elem); } #endif /* CONFIG_INTERWORKING */ #ifdef CONFIG_HS20 wpabuf_free(anqp->hs20_capability_list); wpabuf_free(anqp->hs20_operator_friendly_name); wpabuf_free(anqp->hs20_wan_metrics); wpabuf_free(anqp->hs20_connection_capability); wpabuf_free(anqp->hs20_operating_class); wpabuf_free(anqp->hs20_osu_providers_list); wpabuf_free(anqp->hs20_operator_icon_metadata); wpabuf_free(anqp->hs20_osu_providers_nai_list); #endif /* CONFIG_HS20 */ os_free(anqp); } static void wpa_bss_update_pending_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *old_bss, struct wpa_bss *new_bss) { struct wpa_radio_work *work; struct wpa_connect_work *cwork; work = radio_work_pending(wpa_s, "sme-connect"); if (!work) work = radio_work_pending(wpa_s, "connect"); if (!work) return; cwork = work->ctx; if (cwork->bss != old_bss) return; wpa_printf(MSG_DEBUG, "Update BSS pointer for the pending connect radio work"); cwork->bss = new_bss; if (!new_bss) cwork->bss_removed = 1; } void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, const char *reason) { if (wpa_s->last_scan_res) { unsigned int i; for (i = 0; i < wpa_s->last_scan_res_used; i++) { if (wpa_s->last_scan_res[i] == bss) { os_memmove(&wpa_s->last_scan_res[i], &wpa_s->last_scan_res[i + 1], (wpa_s->last_scan_res_used - i - 1) * sizeof(struct wpa_bss *)); wpa_s->last_scan_res_used--; break; } } } wpa_bss_update_pending_connect(wpa_s, bss, NULL); dl_list_del(&bss->list); dl_list_del(&bss->list_id); wpa_s->num_bss--; wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(bss->ssid, bss->ssid_len), reason); wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id); wpa_bss_anqp_free(bss->anqp); os_free(bss); } /** * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID * @wpa_s: Pointer to wpa_supplicant data * @bssid: BSSID, or %NULL to match any BSSID * @ssid: SSID * @ssid_len: Length of @ssid * Returns: Pointer to the BSS entry or %NULL if not found */ struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid, const u8 *ssid, size_t ssid_len) { struct wpa_bss *bss; if (bssid && !wpa_supplicant_filter_bssid_match(wpa_s, bssid)) return NULL; dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { if ((!bssid || os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0) && bss->ssid_len == ssid_len && os_memcmp(bss->ssid, ssid, ssid_len) == 0) return bss; } return NULL; } void calculate_update_time(const struct os_reltime *fetch_time, unsigned int age_ms, struct os_reltime *update_time) { os_time_t usec; update_time->sec = fetch_time->sec; update_time->usec = fetch_time->usec; update_time->sec -= age_ms / 1000; usec = (age_ms % 1000) * 1000; if (update_time->usec < usec) { update_time->sec--; update_time->usec += 1000000; } update_time->usec -= usec; } static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src, struct os_reltime *fetch_time) { dst->flags = src->flags; os_memcpy(dst->bssid, src->bssid, ETH_ALEN); dst->freq = src->freq; dst->beacon_int = src->beacon_int; dst->caps = src->caps; dst->qual = src->qual; dst->noise = src->noise; dst->level = src->level; dst->tsf = src->tsf; dst->beacon_newer = src->beacon_newer; dst->est_throughput = src->est_throughput; dst->snr = src->snr; calculate_update_time(fetch_time, src->age, &dst->last_update); } static int wpa_bss_is_wps_candidate(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) { #ifdef CONFIG_WPS struct wpa_ssid *ssid; struct wpabuf *wps_ie; int pbc = 0, ret; wps_ie = wpa_bss_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE); if (!wps_ie) return 0; if (wps_is_selected_pbc_registrar(wps_ie)) { pbc = 1; } else if (!wps_is_addr_authorized(wps_ie, wpa_s->own_addr, 1)) { wpabuf_free(wps_ie); return 0; } for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS)) continue; if (ssid->ssid_len && (ssid->ssid_len != bss->ssid_len || os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) != 0)) continue; if (pbc) ret = eap_is_wps_pbc_enrollee(&ssid->eap); else ret = eap_is_wps_pin_enrollee(&ssid->eap); wpabuf_free(wps_ie); return ret; } wpabuf_free(wps_ie); #endif /* CONFIG_WPS */ return 0; } static bool is_p2p_pending_bss(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) { #ifdef CONFIG_P2P u8 addr[ETH_ALEN]; if (os_memcmp(bss->bssid, wpa_s->pending_join_iface_addr, ETH_ALEN) == 0) return true; if (!is_zero_ether_addr(wpa_s->pending_join_dev_addr) && p2p_parse_dev_addr(wpa_bss_ie_ptr(bss), bss->ie_len, addr) == 0 && os_memcmp(addr, wpa_s->pending_join_dev_addr, ETH_ALEN) == 0) return true; #endif /* CONFIG_P2P */ return false; } static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) { struct wpa_ssid *ssid; if (is_p2p_pending_bss(wpa_s, bss)) return 1; for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) { if (ssid->ssid == NULL || ssid->ssid_len == 0) continue; if (ssid->ssid_len == bss->ssid_len && os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0) return 1; } return 0; } static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) { int i; if (bss == wpa_s->current_bss) return 1; if (bss == wpa_s->ml_connect_probe_bss) return 1; if (wpa_s->current_bss && (bss->ssid_len != wpa_s->current_bss->ssid_len || os_memcmp(bss->ssid, wpa_s->current_bss->ssid, bss->ssid_len) != 0)) return 0; /* SSID has changed */ if (!is_zero_ether_addr(bss->bssid) && (os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 || os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0)) return 1; if (!wpa_s->valid_links) return 0; for (i = 0; i < MAX_NUM_MLD_LINKS; i++) { if (!(wpa_s->valid_links & BIT(i))) continue; if (os_memcmp(bss->bssid, wpa_s->links[i].bssid, ETH_ALEN) == 0) return 1; } return 0; } static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s) { struct wpa_bss *bss; dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { if (!wpa_bss_known(wpa_s, bss) && !wpa_bss_is_wps_candidate(wpa_s, bss)) { wpa_bss_remove(wpa_s, bss, __func__); return 0; } } return -1; } static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s) { struct wpa_bss *bss; /* * Remove the oldest entry that does not match with any configured * network. */ if (wpa_bss_remove_oldest_unknown(wpa_s) == 0) return 0; /* * Remove the oldest entry that isn't currently in use. */ dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { if (!wpa_bss_in_use(wpa_s, bss)) { wpa_bss_remove(wpa_s, bss, __func__); return 0; } } return -1; } static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s, const u8 *ssid, size_t ssid_len, struct wpa_scan_res *res, struct os_reltime *fetch_time) { struct wpa_bss *bss; char extra[100]; const u8 *ml_ie; char *pos, *end; int ret = 0; const u8 *mld_addr; bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len); if (bss == NULL) return NULL; bss->id = wpa_s->bss_next_id++; bss->last_update_idx = wpa_s->bss_update_idx; wpa_bss_copy_res(bss, res, fetch_time); os_memcpy(bss->ssid, ssid, ssid_len); bss->ssid_len = ssid_len; bss->ie_len = res->ie_len; bss->beacon_ie_len = res->beacon_ie_len; os_memcpy(bss->ies, res + 1, res->ie_len + res->beacon_ie_len); wpa_bss_set_hessid(bss); os_memset(bss->mld_addr, 0, ETH_ALEN); ml_ie = wpa_scan_get_ml_ie(res, MULTI_LINK_CONTROL_TYPE_BASIC); if (ml_ie) { mld_addr = get_basic_mle_mld_addr(&ml_ie[3], ml_ie[1] - 1); if (mld_addr) os_memcpy(bss->mld_addr, mld_addr, ETH_ALEN); } if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count && wpa_bss_remove_oldest(wpa_s) != 0) { wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d " "because all BSSes are in use. We should normally " "not get here!", (int) wpa_s->num_bss + 1); wpa_s->conf->bss_max_count = wpa_s->num_bss + 1; } dl_list_add_tail(&wpa_s->bss, &bss->list); dl_list_add_tail(&wpa_s->bss_id, &bss->list_id); wpa_s->num_bss++; extra[0] = '\0'; pos = extra; end = pos + sizeof(extra); if (!is_zero_ether_addr(bss->hessid)) ret = os_snprintf(pos, end - pos, " HESSID " MACSTR, MAC2STR(bss->hessid)); if (!is_zero_ether_addr(bss->mld_addr) && !os_snprintf_error(end - pos, ret)) { pos += ret; ret = os_snprintf(pos, end - pos, " MLD ADDR " MACSTR, MAC2STR(bss->mld_addr)); } wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR " SSID '%s' freq %d%s", bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len), bss->freq, extra); wpas_notify_bss_added(wpa_s, bss->bssid, bss->id); return bss; } static int are_ies_equal(const struct wpa_bss *old, const struct wpa_scan_res *new_res, u32 ie) { const u8 *old_ie, *new_ie; struct wpabuf *old_ie_buff = NULL; struct wpabuf *new_ie_buff = NULL; int new_ie_len, old_ie_len, ret, is_multi; switch (ie) { case WPA_IE_VENDOR_TYPE: old_ie = wpa_bss_get_vendor_ie(old, ie); new_ie = wpa_scan_get_vendor_ie(new_res, ie); is_multi = 0; break; case WPS_IE_VENDOR_TYPE: old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie); new_ie_buff = wpa_scan_get_vendor_ie_multi(new_res, ie); is_multi = 1; break; case WLAN_EID_RSN: case WLAN_EID_SUPP_RATES: case WLAN_EID_EXT_SUPP_RATES: old_ie = wpa_bss_get_ie(old, ie); new_ie = wpa_scan_get_ie(new_res, ie); is_multi = 0; break; default: wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__); return 0; } if (is_multi) { /* in case of multiple IEs stored in buffer */ old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL; new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL; old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0; new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0; } else { /* in case of single IE */ old_ie_len = old_ie ? old_ie[1] + 2 : 0; new_ie_len = new_ie ? new_ie[1] + 2 : 0; } if (!old_ie || !new_ie) ret = !old_ie && !new_ie; else ret = (old_ie_len == new_ie_len && os_memcmp(old_ie, new_ie, old_ie_len) == 0); wpabuf_free(old_ie_buff); wpabuf_free(new_ie_buff); return ret; } static u32 wpa_bss_compare_res(const struct wpa_bss *old, const struct wpa_scan_res *new_res) { u32 changes = 0; int caps_diff = old->caps ^ new_res->caps; if (old->freq != new_res->freq) changes |= WPA_BSS_FREQ_CHANGED_FLAG; if (old->level != new_res->level) changes |= WPA_BSS_SIGNAL_CHANGED_FLAG; if (caps_diff & IEEE80211_CAP_PRIVACY) changes |= WPA_BSS_PRIVACY_CHANGED_FLAG; if (caps_diff & IEEE80211_CAP_IBSS) changes |= WPA_BSS_MODE_CHANGED_FLAG; if (old->ie_len == new_res->ie_len && os_memcmp(wpa_bss_ie_ptr(old), new_res + 1, old->ie_len) == 0) return changes; changes |= WPA_BSS_IES_CHANGED_FLAG; if (!are_ies_equal(old, new_res, WPA_IE_VENDOR_TYPE)) changes |= WPA_BSS_WPAIE_CHANGED_FLAG; if (!are_ies_equal(old, new_res, WLAN_EID_RSN)) changes |= WPA_BSS_RSNIE_CHANGED_FLAG; if (!are_ies_equal(old, new_res, WPS_IE_VENDOR_TYPE)) changes |= WPA_BSS_WPS_CHANGED_FLAG; if (!are_ies_equal(old, new_res, WLAN_EID_SUPP_RATES) || !are_ies_equal(old, new_res, WLAN_EID_EXT_SUPP_RATES)) changes |= WPA_BSS_RATES_CHANGED_FLAG; return changes; } void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes, const struct wpa_bss *bss) { if (changes & WPA_BSS_FREQ_CHANGED_FLAG) wpas_notify_bss_freq_changed(wpa_s, bss->id); if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG) wpas_notify_bss_signal_changed(wpa_s, bss->id); if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG) wpas_notify_bss_privacy_changed(wpa_s, bss->id); if (changes & WPA_BSS_MODE_CHANGED_FLAG) wpas_notify_bss_mode_changed(wpa_s, bss->id); if (changes & WPA_BSS_WPAIE_CHANGED_FLAG) wpas_notify_bss_wpaie_changed(wpa_s, bss->id); if (changes & WPA_BSS_RSNIE_CHANGED_FLAG) wpas_notify_bss_rsnie_changed(wpa_s, bss->id); if (changes & WPA_BSS_WPS_CHANGED_FLAG) wpas_notify_bss_wps_changed(wpa_s, bss->id); if (changes & WPA_BSS_IES_CHANGED_FLAG) wpas_notify_bss_ies_changed(wpa_s, bss->id); if (changes & WPA_BSS_RATES_CHANGED_FLAG) wpas_notify_bss_rates_changed(wpa_s, bss->id); wpas_notify_bss_seen(wpa_s, bss->id); } static struct wpa_bss * wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, struct wpa_scan_res *res, struct os_reltime *fetch_time) { u32 changes; if (bss->last_update_idx == wpa_s->bss_update_idx) { struct os_reltime update_time; /* * Some drivers (e.g., cfg80211) include multiple BSS entries * for the same BSS if that BSS's channel changes. The BSS list * implementation in wpa_supplicant does not do that and we need * to filter out the obsolete results here to make sure only the * most current BSS information remains in the table. */ wpa_printf(MSG_DEBUG, "BSS: " MACSTR " has multiple entries in the scan results - select the most current one", MAC2STR(bss->bssid)); calculate_update_time(fetch_time, res->age, &update_time); wpa_printf(MSG_DEBUG, "Previous last_update: %u.%06u (freq %d%s)", (unsigned int) bss->last_update.sec, (unsigned int) bss->last_update.usec, bss->freq, (bss->flags & WPA_BSS_ASSOCIATED) ? " assoc" : ""); wpa_printf(MSG_DEBUG, "New last_update: %u.%06u (freq %d%s)", (unsigned int) update_time.sec, (unsigned int) update_time.usec, res->freq, (res->flags & WPA_SCAN_ASSOCIATED) ? " assoc" : ""); if ((bss->flags & WPA_BSS_ASSOCIATED) || (!(res->flags & WPA_SCAN_ASSOCIATED) && !os_reltime_before(&bss->last_update, &update_time))) { wpa_printf(MSG_DEBUG, "Ignore this BSS entry since the previous update looks more current"); return bss; } wpa_printf(MSG_DEBUG, "Accept this BSS entry since it looks more current than the previous update"); } changes = wpa_bss_compare_res(bss, res); if (changes & WPA_BSS_FREQ_CHANGED_FLAG) wpa_printf(MSG_DEBUG, "BSS: " MACSTR " changed freq %d --> %d", MAC2STR(bss->bssid), bss->freq, res->freq); bss->scan_miss_count = 0; bss->last_update_idx = wpa_s->bss_update_idx; wpa_bss_copy_res(bss, res, fetch_time); /* Move the entry to the end of the list */ dl_list_del(&bss->list); #ifdef CONFIG_P2P if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) && !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) { /* * This can happen when non-P2P station interface runs a scan * without P2P IE in the Probe Request frame. P2P GO would reply * to that with a Probe Response that does not include P2P IE. * Do not update the IEs in this BSS entry to avoid such loss of * information that may be needed for P2P operations to * determine group information. */ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for " MACSTR " since that would remove P2P IE information", MAC2STR(bss->bssid)); } else #endif /* CONFIG_P2P */ if (bss->ie_len + bss->beacon_ie_len >= res->ie_len + res->beacon_ie_len) { os_memcpy(bss->ies, res + 1, res->ie_len + res->beacon_ie_len); bss->ie_len = res->ie_len; bss->beacon_ie_len = res->beacon_ie_len; } else { struct wpa_bss *nbss; struct dl_list *prev = bss->list_id.prev; dl_list_del(&bss->list_id); nbss = os_realloc(bss, sizeof(*bss) + res->ie_len + res->beacon_ie_len); if (nbss) { unsigned int i; for (i = 0; i < wpa_s->last_scan_res_used; i++) { if (wpa_s->last_scan_res[i] == bss) { wpa_s->last_scan_res[i] = nbss; break; } } if (wpa_s->current_bss == bss) wpa_s->current_bss = nbss; if (wpa_s->ml_connect_probe_bss == bss) wpa_s->ml_connect_probe_bss = nbss; wpa_bss_update_pending_connect(wpa_s, bss, nbss); bss = nbss; os_memcpy(bss->ies, res + 1, res->ie_len + res->beacon_ie_len); bss->ie_len = res->ie_len; bss->beacon_ie_len = res->beacon_ie_len; } dl_list_add(prev, &bss->list_id); } if (changes & WPA_BSS_IES_CHANGED_FLAG) { const u8 *ml_ie, *mld_addr; wpa_bss_set_hessid(bss); os_memset(bss->mld_addr, 0, ETH_ALEN); ml_ie = wpa_scan_get_ml_ie(res, MULTI_LINK_CONTROL_TYPE_BASIC); if (ml_ie) { mld_addr = get_basic_mle_mld_addr(&ml_ie[3], ml_ie[1] - 1); if (mld_addr) os_memcpy(bss->mld_addr, mld_addr, ETH_ALEN); } } dl_list_add_tail(&wpa_s->bss, &bss->list); notify_bss_changes(wpa_s, changes, bss); return bss; } /** * wpa_bss_update_start - Start a BSS table update from scan results * @wpa_s: Pointer to wpa_supplicant data * * This function is called at the start of each BSS table update round for new * scan results. The actual scan result entries are indicated with calls to * wpa_bss_update_scan_res() and the update round is finished with a call to * wpa_bss_update_end(). */ void wpa_bss_update_start(struct wpa_supplicant *wpa_s) { wpa_s->bss_update_idx++; wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u", wpa_s->bss_update_idx); wpa_s->last_scan_res_used = 0; } /** * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result * @wpa_s: Pointer to wpa_supplicant data * @res: Scan result * @fetch_time: Time when the result was fetched from the driver * * This function updates a BSS table entry (or adds one) based on a scan result. * This is called separately for each scan result between the calls to * wpa_bss_update_start() and wpa_bss_update_end(). */ void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s, struct wpa_scan_res *res, struct os_reltime *fetch_time) { const u8 *ssid, *p2p, *mesh; struct wpa_bss *bss; if (wpa_s->conf->ignore_old_scan_res) { struct os_reltime update; calculate_update_time(fetch_time, res->age, &update); if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) { struct os_reltime age; os_reltime_sub(&wpa_s->scan_trigger_time, &update, &age); wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS " "table entry that is %u.%06u seconds older " "than our scan trigger", (unsigned int) age.sec, (unsigned int) age.usec); return; } } ssid = wpa_scan_get_ie(res, WLAN_EID_SSID); if (ssid == NULL) { wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for " MACSTR, MAC2STR(res->bssid)); return; } if (ssid[1] > SSID_MAX_LEN) { wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for " MACSTR, MAC2STR(res->bssid)); return; } p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE); #ifdef CONFIG_P2P if (p2p == NULL && wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) { /* * If it's a P2P specific interface, then don't update * the scan result without a P2P IE. */ wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR " update for P2P interface", MAC2STR(res->bssid)); return; } #endif /* CONFIG_P2P */ if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN && os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0) return; /* Skip P2P listen discovery results here */ /* TODO: add option for ignoring BSSes we are not interested in * (to save memory) */ mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID); if (mesh && mesh[1] <= SSID_MAX_LEN) ssid = mesh; bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]); if (bss == NULL) bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time); else { bss = wpa_bss_update(wpa_s, bss, res, fetch_time); if (wpa_s->last_scan_res) { unsigned int i; for (i = 0; i < wpa_s->last_scan_res_used; i++) { if (bss == wpa_s->last_scan_res[i]) { /* Already in the list */ return; } } } } if (bss == NULL) return; if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) { struct wpa_bss **n; unsigned int siz; if (wpa_s->last_scan_res_size == 0) siz = 32; else siz = wpa_s->last_scan_res_size * 2; n = os_realloc_array(wpa_s->last_scan_res, siz, sizeof(struct wpa_bss *)); if (n == NULL) return; wpa_s->last_scan_res = n; wpa_s->last_scan_res_size = siz; } if (wpa_s->last_scan_res) wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss; } static int wpa_bss_included_in_scan(const struct wpa_bss *bss, const struct scan_info *info) { int found; size_t i; if (info == NULL) return 1; if (info->num_freqs) { found = 0; for (i = 0; i < info->num_freqs; i++) { if (bss->freq == info->freqs[i]) { found = 1; break; } } if (!found) return 0; } if (info->num_ssids) { found = 0; for (i = 0; i < info->num_ssids; i++) { const struct wpa_driver_scan_ssid *s = &info->ssids[i]; if ((s->ssid == NULL || s->ssid_len == 0) || (s->ssid_len == bss->ssid_len && os_memcmp(s->ssid, bss->ssid, bss->ssid_len) == 0)) { found = 1; break; } } if (!found) return 0; } return 1; } /** * wpa_bss_update_end - End a BSS table update from scan results * @wpa_s: Pointer to wpa_supplicant data * @info: Information about scan parameters * @new_scan: Whether this update round was based on a new scan * * This function is called at the end of each BSS table update round for new * scan results. The start of the update was indicated with a call to * wpa_bss_update_start(). */ void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info, int new_scan) { struct wpa_bss *bss, *n; os_get_reltime(&wpa_s->last_scan); if ((info && info->aborted) || !new_scan) return; /* do not expire entries without new scan */ dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { if (wpa_bss_in_use(wpa_s, bss)) continue; if (!wpa_bss_included_in_scan(bss, info)) continue; /* expire only BSSes that were scanned */ if (bss->last_update_idx < wpa_s->bss_update_idx) bss->scan_miss_count++; if (bss->scan_miss_count >= wpa_s->conf->bss_expiration_scan_count) { wpa_bss_remove(wpa_s, bss, "no match in scan"); } } wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%zu/%zu", wpa_s->last_scan_res_used, wpa_s->last_scan_res_size); } /** * wpa_bss_flush_by_age - Flush old BSS entries * @wpa_s: Pointer to wpa_supplicant data * @age: Maximum entry age in seconds * * Remove BSS entries that have not been updated during the last @age seconds. */ void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age) { struct wpa_bss *bss, *n; struct os_reltime t; if (dl_list_empty(&wpa_s->bss)) return; os_get_reltime(&t); if (t.sec < age) return; /* avoid underflow; there can be no older entries */ t.sec -= age; dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { if (wpa_bss_in_use(wpa_s, bss)) continue; if (wpa_s->reassoc_same_ess && wpa_s->wpa_state != WPA_COMPLETED && wpa_s->last_ssid && bss->ssid_len == wpa_s->last_ssid->ssid_len && os_memcmp(bss->ssid, wpa_s->last_ssid->ssid, bss->ssid_len) == 0) continue; if (os_reltime_before(&bss->last_update, &t)) { wpa_bss_remove(wpa_s, bss, __func__); } else break; } } /** * wpa_bss_init - Initialize BSS table * @wpa_s: Pointer to wpa_supplicant data * Returns: 0 on success, -1 on failure * * This prepares BSS table lists and timer for periodic updates. The BSS table * is deinitialized with wpa_bss_deinit() once not needed anymore. */ int wpa_bss_init(struct wpa_supplicant *wpa_s) { dl_list_init(&wpa_s->bss); dl_list_init(&wpa_s->bss_id); return 0; } /** * wpa_bss_flush - Flush all unused BSS entries * @wpa_s: Pointer to wpa_supplicant data */ void wpa_bss_flush(struct wpa_supplicant *wpa_s) { struct wpa_bss *bss, *n; wpa_s->clear_driver_scan_cache = 1; if (wpa_s->bss.next == NULL) return; /* BSS table not yet initialized */ dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) { if (wpa_bss_in_use(wpa_s, bss)) continue; wpa_bss_remove(wpa_s, bss, __func__); } } /** * wpa_bss_deinit - Deinitialize BSS table * @wpa_s: Pointer to wpa_supplicant data */ void wpa_bss_deinit(struct wpa_supplicant *wpa_s) { wpa_bss_flush(wpa_s); } /** * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID * @wpa_s: Pointer to wpa_supplicant data * @bssid: BSSID * Returns: Pointer to the BSS entry or %NULL if not found */ struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s, const u8 *bssid) { struct wpa_bss *bss; if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) return NULL; dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0) return bss; } return NULL; } /** * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID * @wpa_s: Pointer to wpa_supplicant data * @bssid: BSSID * Returns: Pointer to the BSS entry or %NULL if not found * * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to * find the entry that has the most recent update. This can help in finding the * correct entry in cases where the SSID of the AP may have changed recently * (e.g., in WPS reconfiguration cases). */ struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s, const u8 *bssid) { struct wpa_bss *bss, *found = NULL; if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid)) return NULL; dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0) continue; if (found == NULL || os_reltime_before(&found->last_update, &bss->last_update)) found = bss; } return found; } #ifdef CONFIG_P2P /** * wpa_bss_get_p2p_dev_addr - Fetch the latest BSS table entry based on P2P Device Addr * @wpa_s: Pointer to wpa_supplicant data * @dev_addr: P2P Device Address of the GO * Returns: Pointer to the BSS entry or %NULL if not found * * This function tries to find the entry that has the most recent update. This * can help in finding the correct entry in cases where the SSID of the P2P * Device may have changed recently. */ struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s, const u8 *dev_addr) { struct wpa_bss *bss, *found = NULL; dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) { u8 addr[ETH_ALEN]; if (p2p_parse_dev_addr(wpa_bss_ie_ptr(bss), bss->ie_len, addr) != 0 || os_memcmp(addr, dev_addr, ETH_ALEN) != 0) continue; if (!found || os_reltime_before(&found->last_update, &bss->last_update)) found = bss; } return found; } #endif /* CONFIG_P2P */ /** * wpa_bss_get_id - Fetch a BSS table entry based on identifier * @wpa_s: Pointer to wpa_supplicant data * @id: Unique identifier (struct wpa_bss::id) assigned for the entry * Returns: Pointer to the BSS entry or %NULL if not found */ struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id) { struct wpa_bss *bss; dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) { if (bss->id == id) return bss; } return NULL; } /** * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range * @wpa_s: Pointer to wpa_supplicant data * @idf: Smallest allowed identifier assigned for the entry * @idf: Largest allowed identifier assigned for the entry * Returns: Pointer to the BSS entry or %NULL if not found * * This function is similar to wpa_bss_get_id() but allows a BSS entry with the * smallest id value to be fetched within the specified range without the * caller having to know the exact id. */ struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s, unsigned int idf, unsigned int idl) { struct wpa_bss *bss; dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) { if (bss->id >= idf && bss->id <= idl) return bss; } return NULL; } /** * wpa_bss_get_ie - Fetch a specified information element from a BSS entry * @bss: BSS table entry * @ie: Information element identitifier (WLAN_EID_*) * Returns: Pointer to the information element (id field) or %NULL if not found * * This function returns the first matching information element in the BSS * entry. */ const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie) { return get_ie(wpa_bss_ie_ptr(bss), bss->ie_len, ie); } /** * wpa_bss_get_ie_ext - Fetch a specified extended IE from a BSS entry * @bss: BSS table entry * @ext: Information element extension identifier (WLAN_EID_EXT_*) * Returns: Pointer to the information element (id field) or %NULL if not found * * This function returns the first matching information element in the BSS * entry. */ const u8 * wpa_bss_get_ie_ext(const struct wpa_bss *bss, u8 ext) { return get_ie_ext(wpa_bss_ie_ptr(bss), bss->ie_len, ext); } /** * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry * @bss: BSS table entry * @vendor_type: Vendor type (four octets starting the IE payload) * Returns: Pointer to the information element (id field) or %NULL if not found * * This function returns the first matching information element in the BSS * entry. */ const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type) { const u8 *ies; const struct element *elem; ies = wpa_bss_ie_ptr(bss); for_each_element_id(elem, WLAN_EID_VENDOR_SPECIFIC, ies, bss->ie_len) { if (elem->datalen >= 4 && vendor_type == WPA_GET_BE32(elem->data)) return &elem->id; } return NULL; } /** * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry * @bss: BSS table entry * @vendor_type: Vendor type (four octets starting the IE payload) * Returns: Pointer to the information element (id field) or %NULL if not found * * This function returns the first matching information element in the BSS * entry. * * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only * from Beacon frames instead of either Beacon or Probe Response frames. */ const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss, u32 vendor_type) { const u8 *ies; const struct element *elem; if (bss->beacon_ie_len == 0) return NULL; ies = wpa_bss_ie_ptr(bss); ies += bss->ie_len; for_each_element_id(elem, WLAN_EID_VENDOR_SPECIFIC, ies, bss->beacon_ie_len) { if (elem->datalen >= 4 && vendor_type == WPA_GET_BE32(elem->data)) return &elem->id; } return NULL; } /** * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry * @bss: BSS table entry * @vendor_type: Vendor type (four octets starting the IE payload) * Returns: Pointer to the information element payload or %NULL if not found * * This function returns concatenated payload of possibly fragmented vendor * specific information elements in the BSS entry. The caller is responsible for * freeing the returned buffer. */ struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss, u32 vendor_type) { struct wpabuf *buf; const u8 *end, *pos; buf = wpabuf_alloc(bss->ie_len); if (buf == NULL) return NULL; pos = wpa_bss_ie_ptr(bss); end = pos + bss->ie_len; while (end - pos > 1) { u8 ie, len; ie = pos[0]; len = pos[1]; if (len > end - pos - 2) break; pos += 2; if (ie == WLAN_EID_VENDOR_SPECIFIC && len >= 4 && vendor_type == WPA_GET_BE32(pos)) wpabuf_put_data(buf, pos + 4, len - 4); pos += len; } if (wpabuf_len(buf) == 0) { wpabuf_free(buf); buf = NULL; } return buf; } /** * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry * @bss: BSS table entry * @vendor_type: Vendor type (four octets starting the IE payload) * Returns: Pointer to the information element payload or %NULL if not found * * This function returns concatenated payload of possibly fragmented vendor * specific information elements in the BSS entry. The caller is responsible for * freeing the returned buffer. * * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only * from Beacon frames instead of either Beacon or Probe Response frames. */ struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss, u32 vendor_type) { struct wpabuf *buf; const u8 *end, *pos; buf = wpabuf_alloc(bss->beacon_ie_len); if (buf == NULL) return NULL; pos = wpa_bss_ie_ptr(bss); pos += bss->ie_len; end = pos + bss->beacon_ie_len; while (end - pos > 1) { u8 id, len; id = *pos++; len = *pos++; if (len > end - pos) break; if (id == WLAN_EID_VENDOR_SPECIFIC && len >= 4 && vendor_type == WPA_GET_BE32(pos)) wpabuf_put_data(buf, pos + 4, len - 4); pos += len; } if (wpabuf_len(buf) == 0) { wpabuf_free(buf); buf = NULL; } return buf; } /** * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS * @bss: BSS table entry * Returns: Maximum legacy rate in units of 500 kbps */ int wpa_bss_get_max_rate(const struct wpa_bss *bss) { int rate = 0; const u8 *ie; int i; ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); for (i = 0; ie && i < ie[1]; i++) { if ((ie[i + 2] & 0x7f) > rate) rate = ie[i + 2] & 0x7f; } ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); for (i = 0; ie && i < ie[1]; i++) { if ((ie[i + 2] & 0x7f) > rate) rate = ie[i + 2] & 0x7f; } return rate; } /** * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS * @bss: BSS table entry * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps) * Returns: number of legacy TX rates or -1 on failure * * The caller is responsible for freeing the returned buffer with os_free() in * case of success. */ int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates) { const u8 *ie, *ie2; int i, j; unsigned int len; u8 *r; ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES); ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES); len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0); r = os_malloc(len); if (!r) return -1; for (i = 0; ie && i < ie[1]; i++) r[i] = ie[i + 2] & 0x7f; for (j = 0; ie2 && j < ie2[1]; j++) r[i + j] = ie2[j + 2] & 0x7f; *rates = r; return len; } #ifdef CONFIG_FILS const u8 * wpa_bss_get_fils_cache_id(const struct wpa_bss *bss) { const u8 *ie; if (bss) { ie = wpa_bss_get_ie(bss, WLAN_EID_FILS_INDICATION); if (ie && ie[1] >= 4 && WPA_GET_LE16(ie + 2) & BIT(7)) return ie + 4; } return NULL; } #endif /* CONFIG_FILS */ int wpa_bss_ext_capab(const struct wpa_bss *bss, unsigned int capab) { if (!bss) return 0; return ieee802_11_ext_capab(wpa_bss_get_ie(bss, WLAN_EID_EXT_CAPAB), capab); } /** * wpa_bss_defrag_mle - Get a buffer holding a de-fragmented ML element * @bss: BSS table entry * @type: ML control type */ struct wpabuf * wpa_bss_defrag_mle(const struct wpa_bss *bss, u8 type) { struct ieee802_11_elems elems; const u8 *pos = wpa_bss_ie_ptr(bss); size_t len = bss->ie_len; if (ieee802_11_parse_elems(pos, len, &elems, 1) == ParseFailed) return NULL; return ieee802_11_defrag_mle(&elems, type); } static void wpa_bss_parse_ml_rnr_ap_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, u8 mbssid_idx, const struct ieee80211_neighbor_ap_info *ap_info, size_t len, u16 *seen, u16 *missing) { const u8 *pos, *end; const u8 *mld_params; u8 count, mld_params_offset; u8 i, type, link_id; count = RNR_TBTT_INFO_COUNT_VAL(ap_info->tbtt_info_hdr) + 1; type = ap_info->tbtt_info_hdr & RNR_TBTT_INFO_HDR_TYPE_MSK; /* MLD information is at offset 13 or at start */ if (type == 0 && ap_info->tbtt_info_len >= RNR_TBTT_INFO_MLD_LEN) { /* MLD info is appended */ mld_params_offset = RNR_TBTT_INFO_LEN; } else { /* TODO: Support NSTR AP */ return; } pos = (const u8 *) ap_info; end = pos + len; pos += sizeof(*ap_info); for (i = 0; i < count; i++) { if (bss->n_mld_links >= MAX_NUM_MLD_LINKS) return; if (end - pos < ap_info->tbtt_info_len) break; mld_params = pos + mld_params_offset; link_id = *(mld_params + 1) & EHT_ML_LINK_ID_MSK; if (*mld_params != mbssid_idx) { wpa_printf(MSG_DEBUG, "MLD: Reported link not part of MLD"); } else if (!(BIT(link_id) & *seen)) { struct wpa_bss *neigh_bss = wpa_bss_get_bssid(wpa_s, ap_info->data + 1); *seen |= BIT(link_id); wpa_printf(MSG_DEBUG, "MLD: mld ID=%u, link ID=%u", *mld_params, link_id); if (neigh_bss) { struct mld_link *l; l = &bss->mld_links[bss->n_mld_links]; l->link_id = link_id; os_memcpy(l->bssid, ap_info->data + 1, ETH_ALEN); l->freq = neigh_bss->freq; bss->n_mld_links++; } else { *missing |= BIT(link_id); } } pos += ap_info->tbtt_info_len; } } /** * wpa_bss_parse_basic_ml_element - Parse the Basic Multi-Link element * @wpa_s: Pointer to wpa_supplicant data * @bss: BSS table entry * @mld_addr: AP MLD address (or %NULL) * @link_info: Array to store link information (or %NULL), * should be initialized and #MAX_NUM_MLD_LINKS elements long * @missing_links: Result bitmask of links that were not discovered (or %NULL) * Returns: 0 on success or -1 for non-MLD or parsing failures * * Parses the Basic Multi-Link element of the BSS into @link_info using the scan * information stored in the wpa_supplicant data to fill in information for * links where possible. The @missing_links out parameter will contain any links * for which no corresponding BSS was found. */ int wpa_bss_parse_basic_ml_element(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, u8 *ap_mld_addr, u16 *missing_links) { struct ieee802_11_elems elems; struct wpabuf *mlbuf; const struct element *elem; u8 mbssid_idx = 0; u8 ml_ie_len; const struct ieee80211_eht_ml *eht_ml; const struct eht_ml_basic_common_info *ml_basic_common_info; u8 i, link_id; const u16 control_mask = MULTI_LINK_CONTROL_TYPE_MASK | BASIC_MULTI_LINK_CTRL_PRES_LINK_ID | BASIC_MULTI_LINK_CTRL_PRES_BSS_PARAM_CH_COUNT | BASIC_MULTI_LINK_CTRL_PRES_MLD_CAPA; const u16 control = MULTI_LINK_CONTROL_TYPE_BASIC | BASIC_MULTI_LINK_CTRL_PRES_LINK_ID | BASIC_MULTI_LINK_CTRL_PRES_BSS_PARAM_CH_COUNT | BASIC_MULTI_LINK_CTRL_PRES_MLD_CAPA; u16 missing = 0; u16 seen; const u8 *ies_pos = wpa_bss_ie_ptr(bss); size_t ies_len = bss->ie_len ? bss->ie_len : bss->beacon_ie_len; int ret = -1; struct mld_link *l; if (ieee802_11_parse_elems(ies_pos, ies_len, &elems, 1) == ParseFailed) { wpa_dbg(wpa_s, MSG_DEBUG, "MLD: Failed to parse elements"); return ret; } mlbuf = ieee802_11_defrag_mle(&elems, MULTI_LINK_CONTROL_TYPE_BASIC); if (!mlbuf) { wpa_dbg(wpa_s, MSG_DEBUG, "MLD: No Multi-Link element"); return ret; } ml_ie_len = wpabuf_len(mlbuf); /* * for ext ID + 2 control + common info len + MLD address + * link info */ if (ml_ie_len < 2UL + 1UL + ETH_ALEN + 1UL) goto out; eht_ml = (const struct ieee80211_eht_ml *) wpabuf_head(mlbuf); if ((le_to_host16(eht_ml->ml_control) & control_mask) != control) { wpa_printf(MSG_DEBUG, "MLD: Unexpected Multi-Link element control=0x%x (mask 0x%x expected 0x%x)", le_to_host16(eht_ml->ml_control), control_mask, control); goto out; } ml_basic_common_info = (const struct eht_ml_basic_common_info *) eht_ml->variable; /* Common info length should be valid */ if (ml_basic_common_info->len < ETH_ALEN + 1UL) goto out; /* Get the MLD address and MLD link ID */ if (ap_mld_addr) os_memcpy(ap_mld_addr, ml_basic_common_info->mld_addr, ETH_ALEN); bss->n_mld_links = 0; l = &bss->mld_links[bss->n_mld_links]; link_id = ml_basic_common_info->variable[0] & EHT_ML_LINK_ID_MSK; l->link_id = link_id; os_memcpy(l->bssid, bss->bssid, ETH_ALEN); l->freq = bss->freq; seen = BIT(link_id); bss->n_mld_links++; /* * The AP MLD ID in the RNR corresponds to the MBSSID index, see * IEEE P802.11be/D4.0, 9.4.2.169.2 (Neighbor AP Information field). * * For the transmitting BSSID it is clear that both the MBSSID index * and the AP MLD ID in the RNR are zero. * * For nontransmitted BSSIDs we will have a BSS generated from the * MBSSID element(s) using inheritance rules. Included in the elements * is the MBSSID Index Element. The RNR is copied from the Beacon/Probe * Response frame that was send by the transmitting BSSID. As such, the * reported AP MLD ID in the RNR will match the value in the MBSSID * Index Element. */ elem = (const struct element *) wpa_bss_get_ie(bss, WLAN_EID_MULTIPLE_BSSID_INDEX); if (elem && elem->datalen >= 1) mbssid_idx = elem->data[0]; for_each_element_id(elem, WLAN_EID_REDUCED_NEIGHBOR_REPORT, wpa_bss_ie_ptr(bss), bss->ie_len ? bss->ie_len : bss->beacon_ie_len) { const struct ieee80211_neighbor_ap_info *ap_info; const u8 *pos = elem->data; size_t len = elem->datalen; /* RNR IE may contain more than one Neighbor AP Info */ while (sizeof(*ap_info) <= len) { size_t ap_info_len = sizeof(*ap_info); u8 count; ap_info = (const struct ieee80211_neighbor_ap_info *) pos; count = RNR_TBTT_INFO_COUNT_VAL(ap_info->tbtt_info_hdr) + 1; ap_info_len += count * ap_info->tbtt_info_len; if (ap_info_len > len) goto out; wpa_bss_parse_ml_rnr_ap_info(wpa_s, bss, mbssid_idx, ap_info, len, &seen, &missing); pos += ap_info_len; len -= ap_info_len; } } wpa_printf(MSG_DEBUG, "MLD: n_mld_links=%u (unresolved: 0x%04hx)", bss->n_mld_links, missing); for (i = 0; i < bss->n_mld_links; i++) { wpa_printf(MSG_DEBUG, "MLD: link=%u, bssid=" MACSTR, bss->mld_links[i].link_id, MAC2STR(bss->mld_links[i].bssid)); } if (missing_links) *missing_links = missing; ret = 0; out: wpabuf_free(mlbuf); return ret; } /* * wpa_bss_parse_reconf_ml_element - Parse the Reconfiguration ML element * @wpa_s: Pointer to wpa_supplicant data * @bss: BSS table entry * Returns: The bitmap of links that are going to be removed */ u16 wpa_bss_parse_reconf_ml_element(struct wpa_supplicant *wpa_s, struct wpa_bss *bss) { struct ieee802_11_elems elems; struct wpabuf *mlbuf; const u8 *pos = wpa_bss_ie_ptr(bss); size_t len = bss->ie_len ? bss->ie_len : bss->beacon_ie_len; const struct ieee80211_eht_ml *ml; u16 removed_links = 0; u8 ml_common_len; if (ieee802_11_parse_elems(pos, len, &elems, 1) == ParseFailed) return 0; if (!elems.reconf_mle || !elems.reconf_mle_len) return 0; mlbuf = ieee802_11_defrag_mle(&elems, MULTI_LINK_CONTROL_TYPE_RECONF); if (!mlbuf) return 0; ml = (const struct ieee80211_eht_ml *) wpabuf_head(mlbuf); len = wpabuf_len(mlbuf); if (len < sizeof(*ml)) goto out; ml_common_len = 1; if (ml->ml_control & RECONF_MULTI_LINK_CTRL_PRES_MLD_MAC_ADDR) ml_common_len += ETH_ALEN; if (len < sizeof(*ml) + ml_common_len) { wpa_printf(MSG_DEBUG, "MLD: Unexpected Reconfiguration ML element length: (%zu < %zu)", len, sizeof(*ml) + ml_common_len); goto out; } pos = ml->variable + ml_common_len; len -= sizeof(*ml) + ml_common_len; while (len >= 2 + sizeof(struct ieee80211_eht_per_sta_profile)) { size_t sub_elem_len = *(pos + 1); if (2 + sub_elem_len > len) { wpa_printf(MSG_DEBUG, "MLD: Invalid link info len: %zu %zu", 2 + sub_elem_len, len); goto out; } if (*pos == EHT_ML_SUB_ELEM_PER_STA_PROFILE) { const struct ieee80211_eht_per_sta_profile *sta_prof = (const struct ieee80211_eht_per_sta_profile *) (pos + 2); u16 control = le_to_host16(sta_prof->sta_control); u8 link_id; link_id = control & EHT_PER_STA_RECONF_CTRL_LINK_ID_MSK; removed_links |= BIT(link_id); } pos += 2 + sub_elem_len; len -= 2 + sub_elem_len; } wpa_printf(MSG_DEBUG, "MLD: Reconfiguration: removed_links=0x%x", removed_links); out: wpabuf_free(mlbuf); return removed_links; }