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-rw-r--r--hostapd/wme.c285
1 files changed, 179 insertions, 106 deletions
diff --git a/hostapd/wme.c b/hostapd/wme.c
index 727ee7e..f2bbbd9 100644
--- a/hostapd/wme.c
+++ b/hostapd/wme.c
@@ -24,47 +24,63 @@
/* TODO: maintain separate sequence and fragment numbers for each AC
* TODO: IGMP snooping to track which multicasts to forward - and use QOS-DATA
- * if only WME stations are receiving a certain group */
+ * if only WMM stations are receiving a certain group */
-static u8 wme_oui[3] = { 0x00, 0x50, 0xf2 };
+static inline u8 wmm_aci_aifsn(int aifsn, int acm, int aci)
+{
+ u8 ret;
+ ret = (aifsn << WMM_AC_AIFNS_SHIFT) & WMM_AC_AIFSN_MASK;
+ if (acm)
+ ret |= WMM_AC_ACM;
+ ret |= (aci << WMM_AC_ACI_SHIFT) & WMM_AC_ACI_MASK;
+ return ret;
+}
+
+
+static inline u8 wmm_ecw(int ecwmin, int ecwmax)
+{
+ return ((ecwmin << WMM_AC_ECWMIN_SHIFT) & WMM_AC_ECWMIN_MASK) |
+ ((ecwmax << WMM_AC_ECWMAX_SHIFT) & WMM_AC_ECWMAX_MASK);
+}
-/* Add WME Parameter Element to Beacon and Probe Response frames. */
-u8 * hostapd_eid_wme(struct hostapd_data *hapd, u8 *eid)
+/*
+ * Add WMM Parameter Element to Beacon, Probe Response, and (Re)Association
+ * Response frames.
+ */
+u8 * hostapd_eid_wmm(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
- struct wme_parameter_element *wme =
- (struct wme_parameter_element *) (pos + 2);
+ struct wmm_parameter_element *wmm =
+ (struct wmm_parameter_element *) (pos + 2);
int e;
- if (!hapd->conf->wme_enabled)
+ if (!hapd->conf->wmm_enabled)
return eid;
eid[0] = WLAN_EID_VENDOR_SPECIFIC;
- wme->oui[0] = 0x00;
- wme->oui[1] = 0x50;
- wme->oui[2] = 0xf2;
- wme->oui_type = WME_OUI_TYPE;
- wme->oui_subtype = WME_OUI_SUBTYPE_PARAMETER_ELEMENT;
- wme->version = WME_VERSION;
- wme->acInfo = hapd->parameter_set_count & 0xf;
+ wmm->oui[0] = 0x00;
+ wmm->oui[1] = 0x50;
+ wmm->oui[2] = 0xf2;
+ wmm->oui_type = WMM_OUI_TYPE;
+ wmm->oui_subtype = WMM_OUI_SUBTYPE_PARAMETER_ELEMENT;
+ wmm->version = WMM_VERSION;
+ wmm->qos_info = hapd->parameter_set_count & 0xf;
/* fill in a parameter set record for each AC */
for (e = 0; e < 4; e++) {
- struct wme_ac_parameter *ac = &wme->ac[e];
- struct hostapd_wme_ac_params *acp =
- &hapd->iconf->wme_ac_params[e];
-
- ac->aifsn = acp->aifs;
- ac->acm = acp->admission_control_mandatory;
- ac->aci = e;
- ac->reserved = 0;
- ac->eCWmin = acp->cwmin;
- ac->eCWmax = acp->cwmax;
- ac->txopLimit = host_to_le16(acp->txopLimit);
+ struct wmm_ac_parameter *ac = &wmm->ac[e];
+ struct hostapd_wmm_ac_params *acp =
+ &hapd->iconf->wmm_ac_params[e];
+
+ ac->aci_aifsn = wmm_aci_aifsn(acp->aifs,
+ acp->admission_control_mandatory,
+ e);
+ ac->cw = wmm_ecw(acp->cwmin, acp->cwmax);
+ ac->txop_limit = host_to_le16(acp->txop_limit);
}
- pos = (u8 *) (wme + 1);
+ pos = (u8 *) (wmm + 1);
eid[1] = pos - eid - 2; /* element length */
return pos;
@@ -72,31 +88,28 @@ u8 * hostapd_eid_wme(struct hostapd_data *hapd, u8 *eid)
/* This function is called when a station sends an association request with
- * WME info element. The function returns zero on success or non-zero on any
- * error in WME element. eid does not include Element ID and Length octets. */
-int hostapd_eid_wme_valid(struct hostapd_data *hapd, u8 *eid, size_t len)
+ * WMM info element. The function returns zero on success or non-zero on any
+ * error in WMM element. eid does not include Element ID and Length octets. */
+int hostapd_eid_wmm_valid(struct hostapd_data *hapd, u8 *eid, size_t len)
{
- struct wme_information_element *wme;
+ struct wmm_information_element *wmm;
- wpa_hexdump(MSG_MSGDUMP, "WME IE", eid, len);
+ wpa_hexdump(MSG_MSGDUMP, "WMM IE", eid, len);
- if (len < sizeof(struct wme_information_element)) {
- wpa_printf(MSG_DEBUG, "Too short WME IE (len=%lu)",
+ if (len < sizeof(struct wmm_information_element)) {
+ wpa_printf(MSG_DEBUG, "Too short WMM IE (len=%lu)",
(unsigned long) len);
return -1;
}
- wme = (struct wme_information_element *) eid;
- wpa_printf(MSG_DEBUG, "Validating WME IE: OUI %02x:%02x:%02x "
- "OUI type %d OUI sub-type %d version %d",
- wme->oui[0], wme->oui[1], wme->oui[2], wme->oui_type,
- wme->oui_subtype, wme->version);
- if (os_memcmp(wme->oui, wme_oui, sizeof(wme_oui)) != 0 ||
- wme->oui_type != WME_OUI_TYPE ||
- wme->oui_subtype != WME_OUI_SUBTYPE_INFORMATION_ELEMENT ||
- wme->version != WME_VERSION) {
- wpa_printf(MSG_DEBUG, "Unsupported WME IE OUI/Type/Subtype/"
- "Version");
+ wmm = (struct wmm_information_element *) eid;
+ wpa_printf(MSG_DEBUG, "Validating WMM IE: OUI %02x:%02x:%02x "
+ "OUI type %d OUI sub-type %d version %d QoS info 0x%x",
+ wmm->oui[0], wmm->oui[1], wmm->oui[2], wmm->oui_type,
+ wmm->oui_subtype, wmm->version, wmm->qos_info);
+ if (wmm->oui_subtype != WMM_OUI_SUBTYPE_INFORMATION_ELEMENT ||
+ wmm->version != WMM_VERSION) {
+ wpa_printf(MSG_DEBUG, "Unsupported WMM IE Subtype/Version");
return -1;
}
@@ -105,31 +118,30 @@ int hostapd_eid_wme_valid(struct hostapd_data *hapd, u8 *eid, size_t len)
/* This function is called when a station sends an ACK frame for an AssocResp
- * frame (status=success) and the matching AssocReq contained a WME element.
+ * frame (status=success) and the matching AssocReq contained a WMM element.
*/
-int hostapd_wme_sta_config(struct hostapd_data *hapd, struct sta_info *sta)
+int hostapd_wmm_sta_config(struct hostapd_data *hapd, struct sta_info *sta)
{
- /* update kernel STA data for WME related items (WLAN_STA_WPA flag) */
- if (sta->flags & WLAN_STA_WME)
+ /* update kernel STA data for WMM related items (WLAN_STA_WPA flag) */
+ if (sta->flags & WLAN_STA_WMM)
hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
- WLAN_STA_WME, ~0);
+ WLAN_STA_WMM, ~0);
else
hostapd_sta_set_flags(hapd, sta->addr, sta->flags,
- 0, ~WLAN_STA_WME);
+ 0, ~WLAN_STA_WMM);
return 0;
}
-static void wme_send_action(struct hostapd_data *hapd, const u8 *addr,
- const struct wme_tspec_info_element *tspec,
+static void wmm_send_action(struct hostapd_data *hapd, const u8 *addr,
+ const struct wmm_tspec_element *tspec,
u8 action_code, u8 dialogue_token, u8 status_code)
{
u8 buf[256];
struct ieee80211_mgmt *m = (struct ieee80211_mgmt *) buf;
- struct wme_tspec_info_element *t =
- (struct wme_tspec_info_element *)
- m->u.action.u.wme_action.variable;
+ struct wmm_tspec_element *t = (struct wmm_tspec_element *)
+ m->u.action.u.wmm_action.variable;
int len;
hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
@@ -142,55 +154,117 @@ static void wme_send_action(struct hostapd_data *hapd, const u8 *addr,
os_memcpy(m->sa, hapd->own_addr, ETH_ALEN);
os_memcpy(m->bssid, hapd->own_addr, ETH_ALEN);
m->u.action.category = WLAN_ACTION_WMM;
- m->u.action.u.wme_action.action_code = action_code;
- m->u.action.u.wme_action.dialog_token = dialogue_token;
- m->u.action.u.wme_action.status_code = status_code;
- os_memcpy(t, tspec, sizeof(struct wme_tspec_info_element));
+ m->u.action.u.wmm_action.action_code = action_code;
+ m->u.action.u.wmm_action.dialog_token = dialogue_token;
+ m->u.action.u.wmm_action.status_code = status_code;
+ os_memcpy(t, tspec, sizeof(struct wmm_tspec_element));
len = ((u8 *) (t + 1)) - buf;
if (hostapd_send_mgmt_frame(hapd, m, len, 0) < 0)
- perror("wme_send_action: send");
+ perror("wmm_send_action: send");
}
-/* given frame data payload size in bytes, and data_rate in bits per second
- * returns time to complete frame exchange */
-/* FIX: should not use floating point types */
-static double wme_frame_exchange_time(int bytes, int data_rate, int encryption,
- int cts_protection)
+static void wmm_addts_req(struct hostapd_data *hapd,
+ struct ieee80211_mgmt *mgmt,
+ struct wmm_tspec_element *tspec, size_t len)
{
- /* TODO: account for MAC/PHY headers correctly */
- /* TODO: account for encryption headers */
- /* TODO: account for WDS headers */
- /* TODO: account for CTS protection */
- /* TODO: account for SIFS + ACK at minimum PHY rate */
- return (bytes + 400) * 8.0 / data_rate;
-}
+ u8 *end = ((u8 *) mgmt) + len;
+ int medium_time, pps, duration;
+ int up, psb, dir, tid;
+ u16 val, surplus;
+ if ((u8 *) (tspec + 1) > end) {
+ wpa_printf(MSG_DEBUG, "WMM: TSPEC overflow in ADDTS Request");
+ return;
+ }
-static void wme_setup_request(struct hostapd_data *hapd,
- struct ieee80211_mgmt *mgmt,
- struct wme_tspec_info_element *tspec, size_t len)
-{
- /* FIX: should not use floating point types */
- double medium_time, pps;
+ wpa_printf(MSG_DEBUG, "WMM: ADDTS Request (Dialog Token %d) for TSPEC "
+ "from " MACSTR,
+ mgmt->u.action.u.wmm_action.dialog_token,
+ MAC2STR(mgmt->sa));
+
+ up = (tspec->ts_info[1] >> 3) & 0x07;
+ psb = (tspec->ts_info[1] >> 2) & 0x01;
+ dir = (tspec->ts_info[0] >> 5) & 0x03;
+ tid = (tspec->ts_info[0] >> 1) & 0x0f;
+ wpa_printf(MSG_DEBUG, "WMM: TS Info: UP=%d PSB=%d Direction=%d TID=%d",
+ up, psb, dir, tid);
+ val = le_to_host16(tspec->nominal_msdu_size);
+ wpa_printf(MSG_DEBUG, "WMM: Nominal MSDU Size: %d%s",
+ val & 0x7fff, val & 0x8000 ? " (fixed)" : "");
+ wpa_printf(MSG_DEBUG, "WMM: Mean Data Rate: %u bps",
+ le_to_host32(tspec->mean_data_rate));
+ wpa_printf(MSG_DEBUG, "WMM: Minimum PHY Rate: %u bps",
+ le_to_host32(tspec->minimum_phy_rate));
+ val = le_to_host16(tspec->surplus_bandwidth_allowance);
+ wpa_printf(MSG_DEBUG, "WMM: Surplus Bandwidth Allowance: %u.%04u",
+ val >> 13, 10000 * (val & 0x1fff) / 0x2000);
+
+ val = le_to_host16(tspec->nominal_msdu_size);
+ if (val == 0) {
+ wpa_printf(MSG_DEBUG, "WMM: Invalid Nominal MSDU Size (0)");
+ goto invalid;
+ }
+ /* pps = Ceiling((Mean Data Rate / 8) / Nominal MSDU Size) */
+ pps = ((le_to_host32(tspec->mean_data_rate) / 8) + val - 1) / val;
+ wpa_printf(MSG_DEBUG, "WMM: Packets-per-second estimate for TSPEC: %d",
+ pps);
+
+ if (le_to_host32(tspec->minimum_phy_rate) < 1000000) {
+ wpa_printf(MSG_DEBUG, "WMM: Too small Minimum PHY Rate");
+ goto invalid;
+ }
+
+ duration = (le_to_host16(tspec->nominal_msdu_size) & 0x7fff) * 8 /
+ (le_to_host32(tspec->minimum_phy_rate) / 1000000) +
+ 50 /* FIX: proper SIFS + ACK duration */;
+
+ /* unsigned binary number with an implicit binary point after the
+ * leftmost 3 bits, i.e., 0x2000 = 1.0 */
+ surplus = le_to_host16(tspec->surplus_bandwidth_allowance);
+ if (surplus <= 0x2000) {
+ wpa_printf(MSG_DEBUG, "WMM: Surplus Bandwidth Allowance not "
+ "greater than unity");
+ goto invalid;
+ }
+
+ medium_time = surplus * pps * duration / 0x2000;
+ wpa_printf(MSG_DEBUG, "WMM: Estimated medium time: %u", medium_time);
+
+ /*
+ * TODO: store list of granted (and still active) TSPECs and check
+ * whether there is available medium time for this request. For now,
+ * just refuse requests that would by themselves take very large
+ * portion of the available bandwidth.
+ */
+ if (medium_time > 750000) {
+ wpa_printf(MSG_DEBUG, "WMM: Refuse TSPEC request for over "
+ "75%% of available bandwidth");
+ wmm_send_action(hapd, mgmt->sa, tspec,
+ WMM_ACTION_CODE_ADDTS_RESP,
+ mgmt->u.action.u.wmm_action.dialog_token,
+ WMM_ADDTS_STATUS_REFUSED);
+ return;
+ }
- /* TODO: account for airtime and answer no to tspec setup requests
- * when none left!! */
+ /* Convert to 32 microseconds per second unit */
+ tspec->medium_time = host_to_le16(medium_time / 32);
- pps = (tspec->mean_data_rate / 8.0) / tspec->nominal_msdu_size;
- medium_time = (tspec->surplus_bandwidth_allowance / 8) * pps *
- wme_frame_exchange_time(tspec->nominal_msdu_size,
- tspec->minimum_phy_rate, 0, 0);
- tspec->medium_time = medium_time * 1000000.0 / 32.0;
+ wmm_send_action(hapd, mgmt->sa, tspec, WMM_ACTION_CODE_ADDTS_RESP,
+ mgmt->u.action.u.wmm_action.dialog_token,
+ WMM_ADDTS_STATUS_ADMISSION_ACCEPTED);
+ return;
- wme_send_action(hapd, mgmt->sa, tspec, WME_ACTION_CODE_SETUP_RESPONSE,
- mgmt->u.action.u.wme_action.dialog_token,
- WME_SETUP_RESPONSE_STATUS_ADMISSION_ACCEPTED);
+invalid:
+ wmm_send_action(hapd, mgmt->sa, tspec,
+ WMM_ACTION_CODE_ADDTS_RESP,
+ mgmt->u.action.u.wmm_action.dialog_token,
+ WMM_ADDTS_STATUS_INVALID_PARAMETERS);
}
-void hostapd_wme_action(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
+void hostapd_wmm_action(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
size_t len)
{
int action_code;
@@ -201,11 +275,11 @@ void hostapd_wme_action(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
/* check that the request comes from a valid station */
if (!sta ||
- (sta->flags & (WLAN_STA_ASSOC | WLAN_STA_WME)) !=
- (WLAN_STA_ASSOC | WLAN_STA_WME)) {
+ (sta->flags & (WLAN_STA_ASSOC | WLAN_STA_WMM)) !=
+ (WLAN_STA_ASSOC | WLAN_STA_WMM)) {
hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
- "wme action received is not from associated wme"
+ "wmm action received is not from associated wmm"
" station");
/* TODO: respond with action frame refused status code */
return;
@@ -215,19 +289,18 @@ void hostapd_wme_action(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
if (ieee802_11_parse_elems(pos, left, &elems, 1) == ParseFailed) {
hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
- "hostapd_wme_action - could not parse wme "
+ "hostapd_wmm_action - could not parse wmm "
"action");
/* TODO: respond with action frame invalid parameters status
* code */
return;
}
- if (!elems.wme_tspec ||
- elems.wme_tspec_len != (sizeof(struct wme_tspec_info_element) - 2))
- {
+ if (!elems.wmm_tspec ||
+ elems.wmm_tspec_len != (sizeof(struct wmm_tspec_element) - 2)) {
hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
- "hostapd_wme_action - missing or wrong length "
+ "hostapd_wmm_action - missing or wrong length "
"tspec");
/* TODO: respond with action frame invalid parameters status
* code */
@@ -237,26 +310,26 @@ void hostapd_wme_action(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
/* TODO: check the request is for an AC with ACM set, if not, refuse
* request */
- action_code = mgmt->u.action.u.wme_action.action_code;
+ action_code = mgmt->u.action.u.wmm_action.action_code;
switch (action_code) {
- case WME_ACTION_CODE_SETUP_REQUEST:
- wme_setup_request(hapd, mgmt, (struct wme_tspec_info_element *)
- elems.wme_tspec, len);
+ case WMM_ACTION_CODE_ADDTS_REQ:
+ wmm_addts_req(hapd, mgmt, (struct wmm_tspec_element *)
+ (elems.wmm_tspec - 2), len);
return;
#if 0
/* TODO: needed for client implementation */
- case WME_ACTION_CODE_SETUP_RESPONSE:
- wme_setup_request(hapd, mgmt, len);
+ case WMM_ACTION_CODE_ADDTS_RESP:
+ wmm_setup_request(hapd, mgmt, len);
return;
/* TODO: handle station teardown requests */
- case WME_ACTION_CODE_TEARDOWN:
- wme_teardown(hapd, mgmt, len);
+ case WMM_ACTION_CODE_DELTS:
+ wmm_teardown(hapd, mgmt, len);
return;
#endif
}
hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
- "hostapd_wme_action - unknown action code %d",
+ "hostapd_wmm_action - unknown action code %d",
action_code);
}
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