1 files changed, 499 insertions, 0 deletions

diff --git a/drivers/net/wireless/hostap/hostap_info.c b/drivers/net/wireless/hostap/hostap_info.c
new file mode 100644
index 000000000000..5aa998fdf1c4
--- /dev/null
+++ b/drivers/net/wireless/hostap/hostap_info.c
@@ -0,0 +1,499 @@
+/* Host AP driver Info Frame processing (part of hostap.o module) */
+
+
+/* Called only as a tasklet (software IRQ) */
+static void prism2_info_commtallies16(local_info_t *local, unsigned char *buf,
+                                      int left)
+{
+        struct hfa384x_comm_tallies *tallies;
+
+        if (left < sizeof(struct hfa384x_comm_tallies)) {
+                printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
+                       "info frame\n", local->dev->name, left);
+                return;
+        }
+
+        tallies = (struct hfa384x_comm_tallies *) buf;
+#define ADD_COMM_TALLIES(name) \
+local->comm_tallies.name += le16_to_cpu(tallies->name)
+        ADD_COMM_TALLIES(tx_unicast_frames);
+        ADD_COMM_TALLIES(tx_multicast_frames);
+        ADD_COMM_TALLIES(tx_fragments);
+        ADD_COMM_TALLIES(tx_unicast_octets);
+        ADD_COMM_TALLIES(tx_multicast_octets);
+        ADD_COMM_TALLIES(tx_deferred_transmissions);
+        ADD_COMM_TALLIES(tx_single_retry_frames);
+        ADD_COMM_TALLIES(tx_multiple_retry_frames);
+        ADD_COMM_TALLIES(tx_retry_limit_exceeded);
+        ADD_COMM_TALLIES(tx_discards);
+        ADD_COMM_TALLIES(rx_unicast_frames);
+        ADD_COMM_TALLIES(rx_multicast_frames);
+        ADD_COMM_TALLIES(rx_fragments);
+        ADD_COMM_TALLIES(rx_unicast_octets);
+        ADD_COMM_TALLIES(rx_multicast_octets);
+        ADD_COMM_TALLIES(rx_fcs_errors);
+        ADD_COMM_TALLIES(rx_discards_no_buffer);
+        ADD_COMM_TALLIES(tx_discards_wrong_sa);
+        ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
+        ADD_COMM_TALLIES(rx_message_in_msg_fragments);
+        ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
+#undef ADD_COMM_TALLIES
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static void prism2_info_commtallies32(local_info_t *local, unsigned char *buf,
+                                      int left)
+{
+        struct hfa384x_comm_tallies32 *tallies;
+
+        if (left < sizeof(struct hfa384x_comm_tallies32)) {
+                printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
+                       "info frame\n", local->dev->name, left);
+                return;
+        }
+
+        tallies = (struct hfa384x_comm_tallies32 *) buf;
+#define ADD_COMM_TALLIES(name) \
+local->comm_tallies.name += le32_to_cpu(tallies->name)
+        ADD_COMM_TALLIES(tx_unicast_frames);
+        ADD_COMM_TALLIES(tx_multicast_frames);
+        ADD_COMM_TALLIES(tx_fragments);
+        ADD_COMM_TALLIES(tx_unicast_octets);
+        ADD_COMM_TALLIES(tx_multicast_octets);
+        ADD_COMM_TALLIES(tx_deferred_transmissions);
+        ADD_COMM_TALLIES(tx_single_retry_frames);
+        ADD_COMM_TALLIES(tx_multiple_retry_frames);
+        ADD_COMM_TALLIES(tx_retry_limit_exceeded);
+        ADD_COMM_TALLIES(tx_discards);
+        ADD_COMM_TALLIES(rx_unicast_frames);
+        ADD_COMM_TALLIES(rx_multicast_frames);
+        ADD_COMM_TALLIES(rx_fragments);
+        ADD_COMM_TALLIES(rx_unicast_octets);
+        ADD_COMM_TALLIES(rx_multicast_octets);
+        ADD_COMM_TALLIES(rx_fcs_errors);
+        ADD_COMM_TALLIES(rx_discards_no_buffer);
+        ADD_COMM_TALLIES(tx_discards_wrong_sa);
+        ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
+        ADD_COMM_TALLIES(rx_message_in_msg_fragments);
+        ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
+#undef ADD_COMM_TALLIES
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static void prism2_info_commtallies(local_info_t *local, unsigned char *buf,
+                                    int left)
+{
+        if (local->tallies32)
+                prism2_info_commtallies32(local, buf, left);
+        else
+                prism2_info_commtallies16(local, buf, left);
+}
+
+
+#ifndef PRISM2_NO_STATION_MODES
+#ifndef PRISM2_NO_DEBUG
+static const char* hfa384x_linkstatus_str(u16 linkstatus)
+{
+        switch (linkstatus) {
+        case HFA384X_LINKSTATUS_CONNECTED:
+                return "Connected";
+        case HFA384X_LINKSTATUS_DISCONNECTED:
+                return "Disconnected";
+        case HFA384X_LINKSTATUS_AP_CHANGE:
+                return "Access point change";
+        case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
+                return "Access point out of range";
+        case HFA384X_LINKSTATUS_AP_IN_RANGE:
+                return "Access point in range";
+        case HFA384X_LINKSTATUS_ASSOC_FAILED:
+                return "Association failed";
+        default:
+                return "Unknown";
+        }
+}
+#endif /* PRISM2_NO_DEBUG */
+
+
+/* Called only as a tasklet (software IRQ) */
+static void prism2_info_linkstatus(local_info_t *local, unsigned char *buf,
+                                    int left)
+{
+        u16 val;
+        int non_sta_mode;
+
+        /* Alloc new JoinRequests to occur since LinkStatus for the previous
+         * has been received */
+        local->last_join_time = 0;
+
+        if (left != 2) {
+                printk(KERN_DEBUG "%s: invalid linkstatus info frame "
+                       "length %d\n", local->dev->name, left);
+                return;
+        }
+
+        non_sta_mode = local->iw_mode == IW_MODE_MASTER ||
+                local->iw_mode == IW_MODE_REPEAT ||
+                local->iw_mode == IW_MODE_MONITOR;
+
+        val = buf[0] | (buf[1] << 8);
+        if (!non_sta_mode || val != HFA384X_LINKSTATUS_DISCONNECTED) {
+                PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
+                       local->dev->name, val, hfa384x_linkstatus_str(val));
+        }
+
+        if (non_sta_mode) {
+                netif_carrier_on(local->dev);
+                netif_carrier_on(local->ddev);
+                return;
+        }
+
+        /* Get current BSSID later in scheduled task */
+        set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
+        local->prev_link_status = val;
+        schedule_work(&local->info_queue);
+}
+
+
+static void prism2_host_roaming(local_info_t *local)
+{
+        struct hfa384x_join_request req;
+        struct net_device *dev = local->dev;
+        struct hfa384x_hostscan_result *selected, *entry;
+        int i;
+        unsigned long flags;
+
+        if (local->last_join_time &&
+            time_before(jiffies, local->last_join_time + 10 * HZ)) {
+                PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
+                       "completed - waiting for it before issuing new one\n",
+                       dev->name);
+                return;
+        }
+
+        /* ScanResults are sorted: first ESS results in decreasing signal
+         * quality then IBSS results in similar order.
+         * Trivial roaming policy: just select the first entry.
+         * This could probably be improved by adding hysteresis to limit
+         * number of handoffs, etc.
+         *
+         * Could do periodic RID_SCANREQUEST or Inquire F101 to get new
+         * ScanResults */
+        spin_lock_irqsave(&local->lock, flags);
+        if (local->last_scan_results == NULL ||
+            local->last_scan_results_count == 0) {
+                spin_unlock_irqrestore(&local->lock, flags);
+                PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
+                       dev->name);
+                return;
+        }
+
+        selected = &local->last_scan_results[0];
+
+        if (local->preferred_ap[0] || local->preferred_ap[1] ||
+            local->preferred_ap[2] || local->preferred_ap[3] ||
+            local->preferred_ap[4] || local->preferred_ap[5]) {
+                /* Try to find preferred AP */
+                PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID " MACSTR "\n",
+                       dev->name, MAC2STR(local->preferred_ap));
+                for (i = 0; i < local->last_scan_results_count; i++) {
+                        entry = &local->last_scan_results[i];
+                        if (memcmp(local->preferred_ap, entry->bssid, 6) == 0)
+                        {
+                                PDEBUG(DEBUG_EXTRA, "%s: using preferred AP "
+                                       "selection\n", dev->name);
+                                selected = entry;
+                                break;
+                        }
+                }
+        }
+
+        memcpy(req.bssid, selected->bssid, 6);
+        req.channel = selected->chid;
+        spin_unlock_irqrestore(&local->lock, flags);
+
+        PDEBUG(DEBUG_EXTRA, "%s: JoinRequest: BSSID=" MACSTR " channel=%d\n",
+               dev->name, MAC2STR(req.bssid), le16_to_cpu(req.channel));
+        if (local->func->set_rid(dev, HFA384X_RID_JOINREQUEST, &req,
+                                 sizeof(req))) {
+                printk(KERN_DEBUG "%s: JoinRequest failed\n", dev->name);
+        }
+        local->last_join_time = jiffies;
+}
+
+
+static void hostap_report_scan_complete(local_info_t *local)
+{
+        union iwreq_data wrqu;
+
+        /* Inform user space about new scan results (just empty event,
+         * SIOCGIWSCAN can be used to fetch data */
+        wrqu.data.length = 0;
+        wrqu.data.flags = 0;
+        wireless_send_event(local->dev, SIOCGIWSCAN, &wrqu, NULL);
+
+        /* Allow SIOCGIWSCAN handling to occur since we have received
+         * scanning result */
+        local->scan_timestamp = 0;
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static void prism2_info_scanresults(local_info_t *local, unsigned char *buf,
+                                    int left)
+{
+        u16 *pos;
+        int new_count, i;
+        unsigned long flags;
+        struct hfa384x_scan_result *res;
+        struct hfa384x_hostscan_result *results, *prev;
+
+        if (left < 4) {
+                printk(KERN_DEBUG "%s: invalid scanresult info frame "
+                       "length %d\n", local->dev->name, left);
+                return;
+        }
+
+        pos = (u16 *) buf;
+        pos++;
+        pos++;
+        left -= 4;
+
+        new_count = left / sizeof(struct hfa384x_scan_result);
+        results = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
+                          GFP_ATOMIC);
+        if (results == NULL)
+                return;
+
+        /* Convert to hostscan result format. */
+        res = (struct hfa384x_scan_result *) pos;
+        for (i = 0; i < new_count; i++) {
+                memcpy(&results[i], &res[i],
+                       sizeof(struct hfa384x_scan_result));
+                results[i].atim = 0;
+        }
+
+        spin_lock_irqsave(&local->lock, flags);
+        local->last_scan_type = PRISM2_SCAN;
+        prev = local->last_scan_results;
+        local->last_scan_results = results;
+        local->last_scan_results_count = new_count;
+        spin_unlock_irqrestore(&local->lock, flags);
+        kfree(prev);
+
+        hostap_report_scan_complete(local);
+
+        /* Perform rest of ScanResults handling later in scheduled task */
+        set_bit(PRISM2_INFO_PENDING_SCANRESULTS, &local->pending_info);
+        schedule_work(&local->info_queue);
+}
+
+
+/* Called only as a tasklet (software IRQ) */
+static void prism2_info_hostscanresults(local_info_t *local,
+                                        unsigned char *buf, int left)
+{
+        int i, result_size, copy_len, new_count;
+        struct hfa384x_hostscan_result *results, *prev;
+        unsigned long flags;
+        u16 *pos;
+        u8 *ptr;
+
+        wake_up_interruptible(&local->hostscan_wq);
+
+        if (left < 4) {
+                printk(KERN_DEBUG "%s: invalid hostscanresult info frame "
+                       "length %d\n", local->dev->name, left);
+                return;
+        }
+
+        pos = (u16 *) buf;
+        copy_len = result_size = le16_to_cpu(*pos);
+        if (result_size == 0) {
+                printk(KERN_DEBUG "%s: invalid result_size (0) in "
+                       "hostscanresults\n", local->dev->name);
+                return;
+        }
+        if (copy_len > sizeof(struct hfa384x_hostscan_result))
+                copy_len = sizeof(struct hfa384x_hostscan_result);
+
+        pos++;
+        pos++;
+        left -= 4;
+        ptr = (u8 *) pos;
+
+        new_count = left / result_size;
+        results = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
+                          GFP_ATOMIC);
+        if (results == NULL)
+                return;
+        memset(results, 0, new_count * sizeof(struct hfa384x_hostscan_result));
+
+        for (i = 0; i < new_count; i++) {
+                memcpy(&results[i], ptr, copy_len);
+                ptr += result_size;
+                left -= result_size;
+        }
+
+        if (left) {
+                printk(KERN_DEBUG "%s: short HostScan result entry (%d/%d)\n",
+                       local->dev->name, left, result_size);
+        }
+
+        spin_lock_irqsave(&local->lock, flags);
+        local->last_scan_type = PRISM2_HOSTSCAN;
+        prev = local->last_scan_results;
+        local->last_scan_results = results;
+        local->last_scan_results_count = new_count;
+        spin_unlock_irqrestore(&local->lock, flags);
+        kfree(prev);
+
+        hostap_report_scan_complete(local);
+}
+#endif /* PRISM2_NO_STATION_MODES */
+
+
+/* Called only as a tasklet (software IRQ) */
+void hostap_info_process(local_info_t *local, struct sk_buff *skb)
+{
+        struct hfa384x_info_frame *info;
+        unsigned char *buf;
+        int left;
+#ifndef PRISM2_NO_DEBUG
+        int i;
+#endif /* PRISM2_NO_DEBUG */
+
+        info = (struct hfa384x_info_frame *) skb->data;
+        buf = skb->data + sizeof(*info);
+        left = skb->len - sizeof(*info);
+
+        switch (info->type) {
+        case HFA384X_INFO_COMMTALLIES:
+                prism2_info_commtallies(local, buf, left);
+                break;
+
+#ifndef PRISM2_NO_STATION_MODES
+        case HFA384X_INFO_LINKSTATUS:
+                prism2_info_linkstatus(local, buf, left);
+                break;
+
+        case HFA384X_INFO_SCANRESULTS:
+                prism2_info_scanresults(local, buf, left);
+                break;
+
+        case HFA384X_INFO_HOSTSCANRESULTS:
+                prism2_info_hostscanresults(local, buf, left);
+                break;
+#endif /* PRISM2_NO_STATION_MODES */
+
+#ifndef PRISM2_NO_DEBUG
+        default:
+                PDEBUG(DEBUG_EXTRA, "%s: INFO - len=%d type=0x%04x\n",
+                       local->dev->name, info->len, info->type);
+                PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
+                for (i = 0; i < (left < 100 ? left : 100); i++)
+                        PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
+                PDEBUG2(DEBUG_EXTRA, "\n");
+                break;
+#endif /* PRISM2_NO_DEBUG */
+        }
+}
+
+
+#ifndef PRISM2_NO_STATION_MODES
+static void handle_info_queue_linkstatus(local_info_t *local)
+{
+        int val = local->prev_link_status;
+        int connected;
+        union iwreq_data wrqu;
+
+        connected =
+                val == HFA384X_LINKSTATUS_CONNECTED ||
+                val == HFA384X_LINKSTATUS_AP_CHANGE ||
+                val == HFA384X_LINKSTATUS_AP_IN_RANGE;
+
+        if (local->func->get_rid(local->dev, HFA384X_RID_CURRENTBSSID,
+                                 local->bssid, ETH_ALEN, 1) < 0) {
+                printk(KERN_DEBUG "%s: could not read CURRENTBSSID after "
+                       "LinkStatus event\n", local->dev->name);
+        } else {
+                PDEBUG(DEBUG_EXTRA, "%s: LinkStatus: BSSID=" MACSTR "\n",
+                       local->dev->name,
+                       MAC2STR((unsigned char *) local->bssid));
+                if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
+                        hostap_add_sta(local->ap, local->bssid);
+        }
+
+        /* Get BSSID if we have a valid AP address */
+        if (connected) {
+                netif_carrier_on(local->dev);
+                netif_carrier_on(local->ddev);
+                memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
+        } else {
+                netif_carrier_off(local->dev);
+                netif_carrier_off(local->ddev);
+                memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
+        }
+        wrqu.ap_addr.sa_family = ARPHRD_ETHER;
+
+        /*
+         * Filter out sequential disconnect events in order not to cause a
+         * flood of SIOCGIWAP events that have a race condition with EAPOL
+         * frames and can confuse wpa_supplicant about the current association
+         * status.
+         */
+        if (connected || local->prev_linkstatus_connected)
+                wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
+        local->prev_linkstatus_connected = connected;
+}
+
+
+static void handle_info_queue_scanresults(local_info_t *local)
+{
+        if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
+                prism2_host_roaming(local);
+
+        if (local->host_roaming == 2 && local->iw_mode == IW_MODE_INFRA &&
+            memcmp(local->preferred_ap, "\x00\x00\x00\x00\x00\x00",
+                   ETH_ALEN) != 0) {
+                /*
+                 * Firmware seems to be getting into odd state in host_roaming
+                 * mode 2 when hostscan is used without join command, so try
+                 * to fix this by re-joining the current AP. This does not
+                 * actually trigger a new association if the current AP is
+                 * still in the scan results.
+                 */
+                prism2_host_roaming(local);
+        }
+}
+
+
+/* Called only as scheduled task after receiving info frames (used to avoid
+ * pending too much time in HW IRQ handler). */
+static void handle_info_queue(void *data)
+{
+        local_info_t *local = (local_info_t *) data;
+
+        if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
+                               &local->pending_info))
+                handle_info_queue_linkstatus(local);
+
+        if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
+                               &local->pending_info))
+                handle_info_queue_scanresults(local);
+}
+#endif /* PRISM2_NO_STATION_MODES */
+
+
+void hostap_info_init(local_info_t *local)
+{
+        skb_queue_head_init(&local->info_list);
+#ifndef PRISM2_NO_STATION_MODES
+        INIT_WORK(&local->info_queue, handle_info_queue, local);
+#endif /* PRISM2_NO_STATION_MODES */
+}
+
+
+EXPORT_SYMBOL(hostap_info_init);
+EXPORT_SYMBOL(hostap_info_process);