![Jouni Malinen](/assets/img/avatar_default.png)
This simplifies the callers that use wpa_s->current_bss (which could be NULL). Signed-off-by: Jouni Malinen <j@w1.fi>
1397 lines
37 KiB
C
1397 lines
37 KiB
C
/*
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* BSS table
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* Copyright (c) 2009-2019, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "utils/eloop.h"
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#include "common/ieee802_11_defs.h"
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#include "drivers/driver.h"
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#include "eap_peer/eap.h"
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#include "wpa_supplicant_i.h"
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#include "config.h"
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#include "notify.h"
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#include "scan.h"
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#include "bss.h"
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#define WPA_BSS_FREQ_CHANGED_FLAG BIT(0)
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#define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1)
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#define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2)
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#define WPA_BSS_MODE_CHANGED_FLAG BIT(3)
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#define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4)
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#define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5)
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#define WPA_BSS_WPS_CHANGED_FLAG BIT(6)
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#define WPA_BSS_RATES_CHANGED_FLAG BIT(7)
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#define WPA_BSS_IES_CHANGED_FLAG BIT(8)
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static void wpa_bss_set_hessid(struct wpa_bss *bss)
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{
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#ifdef CONFIG_INTERWORKING
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const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING);
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if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) {
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os_memset(bss->hessid, 0, ETH_ALEN);
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return;
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}
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if (ie[1] == 7)
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os_memcpy(bss->hessid, ie + 3, ETH_ALEN);
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else
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os_memcpy(bss->hessid, ie + 5, ETH_ALEN);
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#endif /* CONFIG_INTERWORKING */
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}
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/**
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* wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry
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* Returns: Allocated ANQP data structure or %NULL on failure
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*
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* The allocated ANQP data structure has its users count set to 1. It may be
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* shared by multiple BSS entries and each shared entry is freed with
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* wpa_bss_anqp_free().
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*/
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struct wpa_bss_anqp * wpa_bss_anqp_alloc(void)
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{
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struct wpa_bss_anqp *anqp;
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anqp = os_zalloc(sizeof(*anqp));
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if (anqp == NULL)
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return NULL;
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#ifdef CONFIG_INTERWORKING
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dl_list_init(&anqp->anqp_elems);
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#endif /* CONFIG_INTERWORKING */
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anqp->users = 1;
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return anqp;
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}
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/**
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* wpa_bss_anqp_clone - Clone an ANQP data structure
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* @anqp: ANQP data structure from wpa_bss_anqp_alloc()
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* Returns: Cloned ANQP data structure or %NULL on failure
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*/
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static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp)
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{
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struct wpa_bss_anqp *n;
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n = os_zalloc(sizeof(*n));
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if (n == NULL)
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return NULL;
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#define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f)
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#ifdef CONFIG_INTERWORKING
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dl_list_init(&n->anqp_elems);
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ANQP_DUP(capability_list);
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ANQP_DUP(venue_name);
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ANQP_DUP(network_auth_type);
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ANQP_DUP(roaming_consortium);
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ANQP_DUP(ip_addr_type_availability);
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ANQP_DUP(nai_realm);
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ANQP_DUP(anqp_3gpp);
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ANQP_DUP(domain_name);
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ANQP_DUP(fils_realm_info);
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#endif /* CONFIG_INTERWORKING */
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#ifdef CONFIG_HS20
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ANQP_DUP(hs20_capability_list);
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ANQP_DUP(hs20_operator_friendly_name);
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ANQP_DUP(hs20_wan_metrics);
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ANQP_DUP(hs20_connection_capability);
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ANQP_DUP(hs20_operating_class);
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ANQP_DUP(hs20_osu_providers_list);
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ANQP_DUP(hs20_operator_icon_metadata);
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ANQP_DUP(hs20_osu_providers_nai_list);
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#endif /* CONFIG_HS20 */
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#undef ANQP_DUP
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return n;
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}
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/**
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* wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry
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* @bss: BSS entry
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* Returns: 0 on success, -1 on failure
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*
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* This function ensures the specific BSS entry has an ANQP data structure that
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* is not shared with any other BSS entry.
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*/
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int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss)
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{
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struct wpa_bss_anqp *anqp;
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if (bss->anqp && bss->anqp->users > 1) {
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/* allocated, but shared - clone an unshared copy */
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anqp = wpa_bss_anqp_clone(bss->anqp);
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if (anqp == NULL)
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return -1;
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anqp->users = 1;
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bss->anqp->users--;
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bss->anqp = anqp;
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return 0;
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}
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if (bss->anqp)
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return 0; /* already allocated and not shared */
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/* not allocated - allocate a new storage area */
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bss->anqp = wpa_bss_anqp_alloc();
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return bss->anqp ? 0 : -1;
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}
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/**
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* wpa_bss_anqp_free - Free an ANQP data structure
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* @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone()
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*/
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static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp)
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{
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#ifdef CONFIG_INTERWORKING
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struct wpa_bss_anqp_elem *elem;
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#endif /* CONFIG_INTERWORKING */
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if (anqp == NULL)
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return;
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anqp->users--;
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if (anqp->users > 0) {
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/* Another BSS entry holds a pointer to this ANQP info */
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return;
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}
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#ifdef CONFIG_INTERWORKING
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wpabuf_free(anqp->capability_list);
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wpabuf_free(anqp->venue_name);
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wpabuf_free(anqp->network_auth_type);
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wpabuf_free(anqp->roaming_consortium);
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wpabuf_free(anqp->ip_addr_type_availability);
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wpabuf_free(anqp->nai_realm);
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wpabuf_free(anqp->anqp_3gpp);
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wpabuf_free(anqp->domain_name);
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wpabuf_free(anqp->fils_realm_info);
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while ((elem = dl_list_first(&anqp->anqp_elems,
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struct wpa_bss_anqp_elem, list))) {
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dl_list_del(&elem->list);
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wpabuf_free(elem->payload);
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os_free(elem);
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}
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#endif /* CONFIG_INTERWORKING */
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#ifdef CONFIG_HS20
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wpabuf_free(anqp->hs20_capability_list);
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wpabuf_free(anqp->hs20_operator_friendly_name);
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wpabuf_free(anqp->hs20_wan_metrics);
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wpabuf_free(anqp->hs20_connection_capability);
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wpabuf_free(anqp->hs20_operating_class);
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wpabuf_free(anqp->hs20_osu_providers_list);
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wpabuf_free(anqp->hs20_operator_icon_metadata);
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wpabuf_free(anqp->hs20_osu_providers_nai_list);
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#endif /* CONFIG_HS20 */
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os_free(anqp);
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}
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static void wpa_bss_update_pending_connect(struct wpa_supplicant *wpa_s,
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struct wpa_bss *old_bss,
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struct wpa_bss *new_bss)
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{
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struct wpa_radio_work *work;
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struct wpa_connect_work *cwork;
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work = radio_work_pending(wpa_s, "sme-connect");
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if (!work)
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work = radio_work_pending(wpa_s, "connect");
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if (!work)
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return;
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cwork = work->ctx;
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if (cwork->bss != old_bss)
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return;
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wpa_printf(MSG_DEBUG,
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"Update BSS pointer for the pending connect radio work");
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cwork->bss = new_bss;
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if (!new_bss)
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cwork->bss_removed = 1;
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}
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void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
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const char *reason)
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{
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if (wpa_s->last_scan_res) {
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unsigned int i;
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for (i = 0; i < wpa_s->last_scan_res_used; i++) {
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if (wpa_s->last_scan_res[i] == bss) {
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os_memmove(&wpa_s->last_scan_res[i],
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&wpa_s->last_scan_res[i + 1],
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(wpa_s->last_scan_res_used - i - 1)
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* sizeof(struct wpa_bss *));
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wpa_s->last_scan_res_used--;
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break;
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}
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}
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}
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wpa_bss_update_pending_connect(wpa_s, bss, NULL);
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dl_list_del(&bss->list);
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dl_list_del(&bss->list_id);
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wpa_s->num_bss--;
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wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
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" SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
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wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
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wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
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wpa_bss_anqp_free(bss->anqp);
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os_free(bss);
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}
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/**
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* wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID
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* @wpa_s: Pointer to wpa_supplicant data
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* @bssid: BSSID
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* @ssid: SSID
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* @ssid_len: Length of @ssid
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* Returns: Pointer to the BSS entry or %NULL if not found
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*/
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struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
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const u8 *ssid, size_t ssid_len)
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{
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struct wpa_bss *bss;
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if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
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return NULL;
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dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
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if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
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bss->ssid_len == ssid_len &&
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os_memcmp(bss->ssid, ssid, ssid_len) == 0)
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return bss;
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}
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return NULL;
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}
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void calculate_update_time(const struct os_reltime *fetch_time,
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unsigned int age_ms,
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struct os_reltime *update_time)
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{
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os_time_t usec;
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update_time->sec = fetch_time->sec;
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update_time->usec = fetch_time->usec;
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update_time->sec -= age_ms / 1000;
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usec = (age_ms % 1000) * 1000;
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if (update_time->usec < usec) {
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update_time->sec--;
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update_time->usec += 1000000;
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}
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update_time->usec -= usec;
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}
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static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src,
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struct os_reltime *fetch_time)
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{
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dst->flags = src->flags;
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os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
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dst->freq = src->freq;
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dst->beacon_int = src->beacon_int;
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dst->caps = src->caps;
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dst->qual = src->qual;
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dst->noise = src->noise;
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dst->level = src->level;
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dst->tsf = src->tsf;
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dst->est_throughput = src->est_throughput;
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dst->snr = src->snr;
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calculate_update_time(fetch_time, src->age, &dst->last_update);
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}
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static int wpa_bss_is_wps_candidate(struct wpa_supplicant *wpa_s,
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struct wpa_bss *bss)
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{
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#ifdef CONFIG_WPS
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struct wpa_ssid *ssid;
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struct wpabuf *wps_ie;
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int pbc = 0, ret;
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wps_ie = wpa_bss_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
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if (!wps_ie)
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return 0;
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if (wps_is_selected_pbc_registrar(wps_ie)) {
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pbc = 1;
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} else if (!wps_is_addr_authorized(wps_ie, wpa_s->own_addr, 1)) {
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wpabuf_free(wps_ie);
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return 0;
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}
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for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
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if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
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continue;
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if (ssid->ssid_len &&
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(ssid->ssid_len != bss->ssid_len ||
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os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) != 0))
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continue;
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if (pbc)
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ret = eap_is_wps_pbc_enrollee(&ssid->eap);
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else
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ret = eap_is_wps_pin_enrollee(&ssid->eap);
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wpabuf_free(wps_ie);
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return ret;
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}
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wpabuf_free(wps_ie);
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#endif /* CONFIG_WPS */
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return 0;
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}
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static bool is_p2p_pending_bss(struct wpa_supplicant *wpa_s,
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struct wpa_bss *bss)
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{
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#ifdef CONFIG_P2P
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u8 addr[ETH_ALEN];
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if (os_memcmp(bss->bssid, wpa_s->pending_join_iface_addr,
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ETH_ALEN) == 0)
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return true;
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if (!is_zero_ether_addr(wpa_s->pending_join_dev_addr) &&
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p2p_parse_dev_addr(wpa_bss_ie_ptr(bss), bss->ie_len, addr) == 0 &&
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os_memcmp(addr, wpa_s->pending_join_dev_addr, ETH_ALEN) == 0)
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return true;
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#endif /* CONFIG_P2P */
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return false;
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}
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static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
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{
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struct wpa_ssid *ssid;
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if (is_p2p_pending_bss(wpa_s, bss))
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return 1;
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for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
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if (ssid->ssid == NULL || ssid->ssid_len == 0)
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continue;
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if (ssid->ssid_len == bss->ssid_len &&
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os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
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return 1;
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}
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return 0;
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}
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static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
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{
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if (bss == wpa_s->current_bss)
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return 1;
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if (wpa_s->current_bss &&
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(bss->ssid_len != wpa_s->current_bss->ssid_len ||
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os_memcmp(bss->ssid, wpa_s->current_bss->ssid,
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bss->ssid_len) != 0))
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return 0; /* SSID has changed */
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return !is_zero_ether_addr(bss->bssid) &&
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(os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
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os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0);
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}
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static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
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{
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struct wpa_bss *bss;
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dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
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if (!wpa_bss_known(wpa_s, bss) &&
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!wpa_bss_is_wps_candidate(wpa_s, bss)) {
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wpa_bss_remove(wpa_s, bss, __func__);
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return 0;
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}
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}
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return -1;
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}
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static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
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{
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struct wpa_bss *bss;
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/*
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* Remove the oldest entry that does not match with any configured
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* network.
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*/
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if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
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return 0;
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/*
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* Remove the oldest entry that isn't currently in use.
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*/
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dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
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if (!wpa_bss_in_use(wpa_s, bss)) {
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wpa_bss_remove(wpa_s, bss, __func__);
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return 0;
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}
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}
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return -1;
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}
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static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
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const u8 *ssid, size_t ssid_len,
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struct wpa_scan_res *res,
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struct os_reltime *fetch_time)
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{
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struct wpa_bss *bss;
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char extra[50];
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bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
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if (bss == NULL)
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return NULL;
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bss->id = wpa_s->bss_next_id++;
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bss->last_update_idx = wpa_s->bss_update_idx;
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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);
|
|
|
|
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++;
|
|
if (!is_zero_ether_addr(bss->hessid))
|
|
os_snprintf(extra, sizeof(extra), " HESSID " MACSTR,
|
|
MAC2STR(bss->hessid));
|
|
else
|
|
extra[0] = '\0';
|
|
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;
|
|
}
|
|
|
|
|
|
static 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;
|
|
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)
|
|
wpa_bss_set_hessid(bss);
|
|
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);
|
|
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 (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) {
|
|
if (2 + pos[1] > end - pos)
|
|
break;
|
|
if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
|
|
vendor_type == WPA_GET_BE32(&pos[2]))
|
|
wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
|
|
pos += 2 + pos[1];
|
|
}
|
|
|
|
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);
|
|
}
|