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authorJouni Malinen <j@w1.fi>2009-12-24 23:12:50 (GMT)
committerJouni Malinen <j@w1.fi>2009-12-24 23:12:50 (GMT)
commit1057d78eb8aa08bd17f2e1d12ba92d7c0718f294 (patch)
treeb911c9cc542fb460f61a86b2d6698aa82eb5cca3 /src/ap/ieee802_11_ht.c
parent6d1278e9980e0f2b92aecdb23de5433d8eb2c652 (diff)
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Move generic AP functionality implementation into src/ap
This code can be shared by both hostapd and wpa_supplicant and this is an initial step in getting the generic code moved to be under the src directories. Couple of generic files still remain under the hostapd directory due to direct dependencies to files there. Once the dependencies have been removed, they will also be moved to the src/ap directory to allow wpa_supplicant to be built without requiring anything from the hostapd directory.
Diffstat (limited to 'src/ap/ieee802_11_ht.c')
-rw-r--r--src/ap/ieee802_11_ht.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/src/ap/ieee802_11_ht.c b/src/ap/ieee802_11_ht.c
new file mode 100644
index 0000000..1cf612b
--- /dev/null
+++ b/src/ap/ieee802_11_ht.c
@@ -0,0 +1,261 @@
+/*
+ * hostapd / IEEE 802.11n HT
+ * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2007-2008, Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "drivers/driver.h"
+#include "hostapd.h"
+#include "config.h"
+#include "sta_info.h"
+#include "beacon.h"
+#include "ieee802_11.h"
+
+
+u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
+{
+ struct ieee80211_ht_capabilities *cap;
+ u8 *pos = eid;
+
+ if (!hapd->iconf->ieee80211n)
+ return eid;
+
+ *pos++ = WLAN_EID_HT_CAP;
+ *pos++ = sizeof(*cap);
+
+ cap = (struct ieee80211_ht_capabilities *) pos;
+ os_memset(cap, 0, sizeof(*cap));
+ cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab);
+ cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params;
+ os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set,
+ 16);
+
+ /* TODO: ht_extended_capabilities (now fully disabled) */
+ /* TODO: tx_bf_capability_info (now fully disabled) */
+ /* TODO: asel_capabilities (now fully disabled) */
+
+ pos += sizeof(*cap);
+
+ return pos;
+}
+
+
+u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
+{
+ struct ieee80211_ht_operation *oper;
+ u8 *pos = eid;
+
+ if (!hapd->iconf->ieee80211n)
+ return eid;
+
+ *pos++ = WLAN_EID_HT_OPERATION;
+ *pos++ = sizeof(*oper);
+
+ oper = (struct ieee80211_ht_operation *) pos;
+ os_memset(oper, 0, sizeof(*oper));
+
+ oper->control_chan = hapd->iconf->channel;
+ oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode);
+ if (hapd->iconf->secondary_channel == 1)
+ oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE |
+ HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH;
+ if (hapd->iconf->secondary_channel == -1)
+ oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW |
+ HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH;
+
+ pos += sizeof(*oper);
+
+ return pos;
+}
+
+
+/*
+op_mode
+Set to 0 (HT pure) under the followign conditions
+ - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or
+ - all STAs in the BSS are 20 MHz HT in 20 MHz BSS
+Set to 1 (HT non-member protection) if there may be non-HT STAs
+ in both the primary and the secondary channel
+Set to 2 if only HT STAs are associated in BSS,
+ however and at least one 20 MHz HT STA is associated
+Set to 3 (HT mixed mode) when one or more non-HT STAs are associated
+ (currently non-GF HT station is considered as non-HT STA also)
+*/
+int hostapd_ht_operation_update(struct hostapd_iface *iface)
+{
+ u16 cur_op_mode, new_op_mode;
+ int op_mode_changes = 0;
+
+ if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed)
+ return 0;
+
+ wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X",
+ __func__, iface->ht_op_mode);
+
+ if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT)
+ && iface->num_sta_ht_no_gf) {
+ iface->ht_op_mode |=
+ HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT;
+ op_mode_changes++;
+ } else if ((iface->ht_op_mode &
+ HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) &&
+ iface->num_sta_ht_no_gf == 0) {
+ iface->ht_op_mode &=
+ ~HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT;
+ op_mode_changes++;
+ }
+
+ if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) &&
+ (iface->num_sta_no_ht || iface->olbc_ht)) {
+ iface->ht_op_mode |= HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT;
+ op_mode_changes++;
+ } else if ((iface->ht_op_mode &
+ HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) &&
+ (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) {
+ iface->ht_op_mode &=
+ ~HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT;
+ op_mode_changes++;
+ }
+
+ /* Note: currently we switch to the MIXED op mode if HT non-greenfield
+ * station is associated. Probably it's a theoretical case, since
+ * it looks like all known HT STAs support greenfield.
+ */
+ new_op_mode = 0;
+ if (iface->num_sta_no_ht ||
+ (iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT))
+ new_op_mode = OP_MODE_MIXED;
+ else if ((iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)
+ && iface->num_sta_ht_20mhz)
+ new_op_mode = OP_MODE_20MHZ_HT_STA_ASSOCED;
+ else if (iface->olbc_ht)
+ new_op_mode = OP_MODE_MAY_BE_LEGACY_STAS;
+ else
+ new_op_mode = OP_MODE_PURE;
+
+ cur_op_mode = iface->ht_op_mode & HT_INFO_OPERATION_MODE_OP_MODE_MASK;
+ if (cur_op_mode != new_op_mode) {
+ iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_OP_MODE_MASK;
+ iface->ht_op_mode |= new_op_mode;
+ op_mode_changes++;
+ }
+
+ wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d",
+ __func__, iface->ht_op_mode, op_mode_changes);
+
+ return op_mode_changes;
+}
+
+
+u16 copy_sta_ht_capab(struct sta_info *sta, const u8 *ht_capab,
+ size_t ht_capab_len)
+{
+ if (!ht_capab ||
+ ht_capab_len < sizeof(struct ieee80211_ht_capabilities)) {
+ sta->flags &= ~WLAN_STA_HT;
+ os_free(sta->ht_capabilities);
+ sta->ht_capabilities = NULL;
+ return WLAN_STATUS_SUCCESS;
+ }
+
+ if (sta->ht_capabilities == NULL) {
+ sta->ht_capabilities =
+ os_zalloc(sizeof(struct ieee80211_ht_capabilities));
+ if (sta->ht_capabilities == NULL)
+ return WLAN_STATUS_UNSPECIFIED_FAILURE;
+ }
+
+ sta->flags |= WLAN_STA_HT;
+ os_memcpy(sta->ht_capabilities, ht_capab,
+ sizeof(struct ieee80211_ht_capabilities));
+
+ return WLAN_STATUS_SUCCESS;
+}
+
+
+static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta)
+{
+ u16 ht_capab;
+
+ ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info);
+ wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: "
+ "0x%04x", MAC2STR(sta->addr), ht_capab);
+ if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) {
+ if (!sta->no_ht_gf_set) {
+ sta->no_ht_gf_set = 1;
+ hapd->iface->num_sta_ht_no_gf++;
+ }
+ wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num "
+ "of non-gf stations %d",
+ __func__, MAC2STR(sta->addr),
+ hapd->iface->num_sta_ht_no_gf);
+ }
+ if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) {
+ if (!sta->ht_20mhz_set) {
+ sta->ht_20mhz_set = 1;
+ hapd->iface->num_sta_ht_20mhz++;
+ }
+ wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of "
+ "20MHz HT STAs %d",
+ __func__, MAC2STR(sta->addr),
+ hapd->iface->num_sta_ht_20mhz);
+ }
+}
+
+
+static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta)
+{
+ if (!sta->no_ht_set) {
+ sta->no_ht_set = 1;
+ hapd->iface->num_sta_no_ht++;
+ }
+ if (hapd->iconf->ieee80211n) {
+ wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of "
+ "non-HT stations %d",
+ __func__, MAC2STR(sta->addr),
+ hapd->iface->num_sta_no_ht);
+ }
+}
+
+
+void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta)
+{
+ if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities)
+ update_sta_ht(hapd, sta);
+ else
+ update_sta_no_ht(hapd, sta);
+
+ if (hostapd_ht_operation_update(hapd->iface) > 0)
+ ieee802_11_set_beacons(hapd->iface);
+}
+
+
+void hostapd_get_ht_capab(struct hostapd_data *hapd,
+ struct ieee80211_ht_capabilities *ht_cap,
+ struct ieee80211_ht_capabilities *neg_ht_cap)
+{
+ u16 cap;
+
+ if (ht_cap == NULL)
+ return;
+ os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap));
+ cap = le_to_host16(neg_ht_cap->ht_capabilities_info);
+ cap &= hapd->iconf->ht_capab;
+ cap |= (hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_DISABLED);
+
+ /* FIXME: Rx STBC needs to be handled specially */
+ cap |= (hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK);
+ neg_ht_cap->ht_capabilities_info = host_to_le16(cap);
+}