| /* Host AP driver Info Frame processing (part of hostap.o module) */ |
| |
| #include <linux/if_arp.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/export.h> |
| #include <linux/etherdevice.h> |
| #include "hostap_wlan.h" |
| #include "hostap.h" |
| #include "hostap_ap.h" |
| |
| /* 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 %pM\n", |
| dev->name, 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=%pM" |
| " channel=%d\n", |
| dev->name, 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; |
| __le16 *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 = (__le16 *) 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 = kcalloc(new_count, sizeof(struct hfa384x_hostscan_result), |
| GFP_ATOMIC); |
| if (results == NULL) |
| return; |
| |
| 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 (le16_to_cpu(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, le16_to_cpu(info->len), |
| le16_to_cpu(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=%pM\n", |
| local->dev->name, |
| (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 && |
| !is_zero_ether_addr(local->preferred_ap)) { |
| /* |
| * 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(struct work_struct *work) |
| { |
| local_info_t *local = container_of(work, local_info_t, info_queue); |
| |
| 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); |
| #endif /* PRISM2_NO_STATION_MODES */ |
| } |
| |
| |
| EXPORT_SYMBOL(hostap_info_init); |
| EXPORT_SYMBOL(hostap_info_process); |