[PATCH] ieee80211: Add QoS (WME) support to the ieee80211 subsystem

tree a3ad796273e98036eb0e9fc063225070fa24508a
parent 1b9c0aeb377abf8e4a43a86cff42382f74ca0259
author Mohamed Abbas <mabbas@linux.intel.com> 1124447069 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127313435 -0500

Add QoS (WME) support to the ieee80211 subsystem.

NOTE: This requires drivers that use the ieee80211 hard_start_xmit
(ipw2100 and ipw2200) to add the priority parameter to their callback.

Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 315 insertions, 19 deletions

diff --git a/net/ieee80211/ieee80211_rx.c b/net/ieee80211/ieee80211_rx.c
index d1ae28280d7e..2c4613527dfd 100644
--- a/net/ieee80211/ieee80211_rx.c
+++ b/net/ieee80211/ieee80211_rx.c
@@ -534,6 +534,9 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
 
         /* Nullfunc frames may have PS-bit set, so they must be passed to
          * hostap_handle_sta_rx() before being dropped here. */
+
+        stype &= ~IEEE80211_STYPE_QOS_DATA;
+
         if (stype != IEEE80211_STYPE_DATA &&
             stype != IEEE80211_STYPE_DATA_CFACK &&
             stype != IEEE80211_STYPE_DATA_CFPOLL &&
@@ -758,6 +761,264 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
 
 #define MGMT_FRAME_FIXED_PART_LENGTH            0x24
 
+static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
+
+/*
+* Make ther structure we read from the beacon packet has
+* the right values
+*/
+static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
+                                     *info_element, int sub_type)
+{
+
+        if (info_element->qui_subtype != sub_type)
+                return -1;
+        if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
+                return -1;
+        if (info_element->qui_type != QOS_OUI_TYPE)
+                return -1;
+        if (info_element->version != QOS_VERSION_1)
+                return -1;
+
+        return 0;
+}
+
+/*
+ * Parse a QoS parameter element
+ */
+static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
+                                            *element_param, struct ieee80211_info_element
+                                            *info_element)
+{
+        int ret = 0;
+        u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
+
+        if ((info_element == NULL) || (element_param == NULL))
+                return -1;
+
+        if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
+                memcpy(element_param->info_element.qui, info_element->data,
+                       info_element->len);
+                element_param->info_element.elementID = info_element->id;
+                element_param->info_element.length = info_element->len;
+        } else
+                ret = -1;
+        if (ret == 0)
+                ret = ieee80211_verify_qos_info(&element_param->info_element,
+                                                QOS_OUI_PARAM_SUB_TYPE);
+        return ret;
+}
+
+/*
+ * Parse a QoS information element
+ */
+static int ieee80211_read_qos_info_element(struct
+                                           ieee80211_qos_information_element
+                                           *element_info, struct ieee80211_info_element
+                                           *info_element)
+{
+        int ret = 0;
+        u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
+
+        if (element_info == NULL)
+                return -1;
+        if (info_element == NULL)
+                return -1;
+
+        if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
+                memcpy(element_info->qui, info_element->data,
+                       info_element->len);
+                element_info->elementID = info_element->id;
+                element_info->length = info_element->len;
+        } else
+                ret = -1;
+
+        if (ret == 0)
+                ret = ieee80211_verify_qos_info(element_info,
+                                                QOS_OUI_INFO_SUB_TYPE);
+        return ret;
+}
+
+/*
+ * Write QoS parameters from the ac parameters.
+ */
+static int ieee80211_qos_convert_ac_to_parameters(struct
+                                                  ieee80211_qos_parameter_info
+                                                  *param_elm, struct
+                                                  ieee80211_qos_parameters
+                                                  *qos_param)
+{
+        int rc = 0;
+        int i;
+        struct ieee80211_qos_ac_parameter *ac_params;
+        u32 txop;
+        u8 cw_min;
+        u8 cw_max;
+
+        for (i = 0; i < QOS_QUEUE_NUM; i++) {
+                ac_params = &(param_elm->ac_params_record[i]);
+
+                qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
+                qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
+
+                cw_min = ac_params->ecw_min_max & 0x0F;
+                qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
+
+                cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
+                qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
+
+                qos_param->flag[i] =
+                    (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
+
+                txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
+                qos_param->tx_op_limit[i] = (u16) txop;
+        }
+        return rc;
+}
+
+/*
+ * we have a generic data element which it may contain QoS information or
+ * parameters element. check the information element length to decide
+ * which type to read
+ */
+static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
+                                             *info_element,
+                                             struct ieee80211_network *network)
+{
+        int rc = 0;
+        struct ieee80211_qos_parameters *qos_param = NULL;
+        struct ieee80211_qos_information_element qos_info_element;
+
+        rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
+
+        if (rc == 0) {
+                network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
+                network->flags |= NETWORK_HAS_QOS_INFORMATION;
+        } else {
+                struct ieee80211_qos_parameter_info param_element;
+
+                rc = ieee80211_read_qos_param_element(&param_element,
+                                                      info_element);
+                if (rc == 0) {
+                        qos_param = &(network->qos_data.parameters);
+                        ieee80211_qos_convert_ac_to_parameters(&param_element,
+                                                               qos_param);
+                        network->flags |= NETWORK_HAS_QOS_PARAMETERS;
+                        network->qos_data.param_count =
+                            param_element.info_element.ac_info & 0x0F;
+                }
+        }
+
+        if (rc == 0) {
+                IEEE80211_DEBUG_QOS("QoS is supported\n");
+                network->qos_data.supported = 1;
+        }
+        return rc;
+}
+
+static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
+                                       *frame, struct ieee80211_rx_stats *stats)
+{
+        struct ieee80211_network network_resp;
+        struct ieee80211_network *network = &network_resp;
+        struct ieee80211_info_element *info_element;
+        struct net_device *dev = ieee->dev;
+        u16 left;
+
+        network->flags = 0;
+        network->qos_data.active = 0;
+        network->qos_data.supported = 0;
+        network->qos_data.param_count = 0;
+        network->qos_data.old_param_count = 0;
+
+        //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
+        network->atim_window = le16_to_cpu(frame->aid);
+        network->listen_interval = le16_to_cpu(frame->status);
+
+        info_element = frame->info_element;
+        left = stats->len - sizeof(*frame);
+
+        while (left >= sizeof(struct ieee80211_info_element)) {
+                if (sizeof(struct ieee80211_info_element) +
+                    info_element->len > left) {
+                        IEEE80211_DEBUG_QOS("ASSOC RESP: parse failed: "
+                                            "info_element->len + 2 > left : "
+                                            "info_element->len+2=%zd left=%d, id=%d.\n",
+                                            info_element->len +
+                                            sizeof(struct
+                                                   ieee80211_info_element),
+                                            left, info_element->id);
+                        return 1;
+                }
+
+                switch (info_element->id) {
+                case MFIE_TYPE_SSID:
+                        if (ieee80211_is_empty_essid(info_element->data,
+                                                     info_element->len)) {
+                                network->flags |= NETWORK_EMPTY_ESSID;
+                                break;
+                        }
+
+                        network->ssid_len = min(info_element->len,
+                                                (u8) IW_ESSID_MAX_SIZE);
+                        memcpy(network->ssid, info_element->data,
+                               network->ssid_len);
+                        if (network->ssid_len < IW_ESSID_MAX_SIZE)
+                                memset(network->ssid + network->ssid_len, 0,
+                                       IW_ESSID_MAX_SIZE - network->ssid_len);
+
+                        IEEE80211_DEBUG_QOS("MFIE_TYPE_SSID: '%s' len=%d.\n",
+                                            network->ssid, network->ssid_len);
+                        break;
+
+                case MFIE_TYPE_TIM:
+                        IEEE80211_DEBUG_QOS("MFIE_TYPE_TIM: ignored\n");
+                        break;
+
+                case MFIE_TYPE_IBSS_SET:
+                        IEEE80211_DEBUG_QOS("MFIE_TYPE_IBSS_SET: ignored\n");
+                        break;
+
+                case MFIE_TYPE_CHALLENGE:
+                        IEEE80211_DEBUG_QOS("MFIE_TYPE_CHALLENGE: ignored\n");
+                        break;
+
+                case MFIE_TYPE_GENERIC:
+                        IEEE80211_DEBUG_QOS("MFIE_TYPE_GENERIC: %d bytes\n",
+                                            info_element->len);
+                        ieee80211_parse_qos_info_param_IE(info_element,
+                                                          network);
+                        break;
+
+                case MFIE_TYPE_RSN:
+                        IEEE80211_DEBUG_QOS("MFIE_TYPE_RSN: %d bytes\n",
+                                            info_element->len);
+                        break;
+
+                case MFIE_TYPE_QOS_PARAMETER:
+                        printk("QoS Error need to parse QOS_PARAMETER IE\n");
+                        break;
+
+                default:
+                        IEEE80211_DEBUG_QOS("unsupported IE %d\n",
+                                            info_element->id);
+                        break;
+                }
+
+                left -= sizeof(struct ieee80211_info_element) +
+                    info_element->len;
+                info_element = (struct ieee80211_info_element *)
+                    &info_element->data[info_element->len];
+        }
+
+        if (ieee->handle_assoc_response != NULL)
+                ieee->handle_assoc_response(dev, frame, network);
+
+        return 0;
+}
+
+/***************************************************/
+
 static inline int ieee80211_is_ofdm_rate(u8 rate)
 {
         switch (rate & ~IEEE80211_BASIC_RATE_MASK) {
@@ -786,6 +1047,9 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i
         struct ieee80211_info_element *info_element;
         u16 left;
         u8 i;
+        network->qos_data.active = 0;
+        network->qos_data.supported = 0;
+        network->qos_data.param_count = 0;
 
         /* Pull out fixed field data */
         memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
@@ -813,13 +1077,11 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i
 
         info_element = beacon->info_element;
         left = stats->len - sizeof(*beacon);
-        while (left >= sizeof(struct ieee80211_info_element)) {
-                if (sizeof(struct ieee80211_info_element) + info_element->len >
-                    left) {
+        while (left >= sizeof(*info_element)) {
+                if (sizeof(*info_element) + info_element->len > left) {
                         IEEE80211_DEBUG_SCAN
                             ("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%Zd left=%d.\n",
-                             info_element->len +
-                             sizeof(struct ieee80211_info_element), left);
+                             info_element->len + sizeof(*info_element), left);
                         return 1;
                 }
 
@@ -847,15 +1109,14 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i
 #ifdef CONFIG_IEEE80211_DEBUG
                         p = rates_str;
 #endif
-                        network->rates_len =
-                            min(info_element->len, MAX_RATES_LENGTH);
+                        network->rates_len = min(info_element->len,
+                                                 MAX_RATES_LENGTH);
                         for (i = 0; i < network->rates_len; i++) {
                                 network->rates[i] = info_element->data[i];
 #ifdef CONFIG_IEEE80211_DEBUG
-                                p += snprintf(p,
-                                              sizeof(rates_str) - (p -
-                                                                   rates_str),
-                                              "%02X ", network->rates[i]);
+                                p += snprintf(p, sizeof(rates_str) -
+                                              (p - rates_str), "%02X ",
+                                              network->rates[i]);
 #endif
                                 if (ieee80211_is_ofdm_rate
                                     (info_element->data[i])) {
@@ -875,15 +1136,14 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i
 #ifdef CONFIG_IEEE80211_DEBUG
                         p = rates_str;
 #endif
-                        network->rates_ex_len =
-                            min(info_element->len, MAX_RATES_EX_LENGTH);
+                        network->rates_ex_len = min(info_element->len,
+                                                    MAX_RATES_EX_LENGTH);
                         for (i = 0; i < network->rates_ex_len; i++) {
                                 network->rates_ex[i] = info_element->data[i];
 #ifdef CONFIG_IEEE80211_DEBUG
-                                p += snprintf(p,
-                                              sizeof(rates_str) - (p -
-                                                                   rates_str),
-                                              "%02X ", network->rates[i]);
+                                p += snprintf(p, sizeof(rates_str) -
+                                              (p - rates_str), "%02X ",
+                                              network->rates[i]);
 #endif
                                 if (ieee80211_is_ofdm_rate
                                     (info_element->data[i])) {
@@ -929,6 +1189,10 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i
                 case MFIE_TYPE_GENERIC:
                         IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n",
                                              info_element->len);
+                        if (!ieee80211_parse_qos_info_param_IE(info_element,
+                                                               network))
+                                break;
+
                         if (info_element->len >= 4 &&
                             info_element->data[0] == 0x00 &&
                             info_element->data[1] == 0x50 &&
@@ -950,14 +1214,18 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i
                                network->rsn_ie_len);
                         break;
 
+                case MFIE_TYPE_QOS_PARAMETER:
+                        printk(KERN_ERR
+                               "QoS Error need to parse QOS_PARAMETER IE\n");
+                        break;
+
                 default:
                         IEEE80211_DEBUG_SCAN("unsupported IE %d\n",
                                              info_element->id);
                         break;
                 }
 
-                left -= sizeof(struct ieee80211_info_element) +
-                    info_element->len;
+                left -= sizeof(*info_element) + info_element->len;
                 info_element = (struct ieee80211_info_element *)
                     &info_element->data[info_element->len];
         }
@@ -1004,6 +1272,9 @@ static inline int is_same_network(struct ieee80211_network *src,
 static inline void update_network(struct ieee80211_network *dst,
                                   struct ieee80211_network *src)
 {
+        int qos_active;
+        u8 old_param;
+
         memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
         dst->capability = src->capability;
         memcpy(dst->rates, src->rates, src->rates_len);
@@ -1026,6 +1297,28 @@ static inline void update_network(struct ieee80211_network *dst,
         dst->rsn_ie_len = src->rsn_ie_len;
 
         dst->last_scanned = jiffies;
+        qos_active = src->qos_data.active;
+        old_param = dst->qos_data.old_param_count;
+        if (dst->flags & NETWORK_HAS_QOS_MASK)
+                memcpy(&dst->qos_data, &src->qos_data,
+                       sizeof(struct ieee80211_qos_data));
+        else {
+                dst->qos_data.supported = src->qos_data.supported;
+                dst->qos_data.param_count = src->qos_data.param_count;
+        }
+
+        if (dst->qos_data.supported == 1) {
+                if (dst->ssid_len)
+                        IEEE80211_DEBUG_QOS
+                            ("QoS the network %s is QoS supported\n",
+                             dst->ssid);
+                else
+                        IEEE80211_DEBUG_QOS
+                            ("QoS the network is QoS supported\n");
+        }
+        dst->qos_data.active = qos_active;
+        dst->qos_data.old_param_count = old_param;
+
         /* dst->last_associate is not overwritten */
 }
 
@@ -1167,6 +1460,9 @@ void ieee80211_rx_mgt(struct ieee80211_device *ieee,
                 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
                                      WLAN_FC_GET_STYPE(le16_to_cpu
                                                        (header->frame_ctl)));
+                ieee80211_handle_assoc_resp(ieee,
+                                            (struct ieee80211_assoc_response *)
+                                            header, stats);
                 break;
 
         case IEEE80211_STYPE_REASSOC_RESP: