src/drivers/driver_common.c

   1 /*
   2  * Common driver-related functions
   3  * Copyright (c) 2003-2011, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10 #include "utils/common.h"
  11 #include "driver.h"
  12
  13 void wpa_scan_results_free(struct wpa_scan_results *res)
  14 {
  15         size_t i;
  16
  17         if (res == NULL)
  18                 return;
  19
  20         for (i = 0; i < res->num; i++)
  21                 os_free(res->res[i]);
  22         os_free(res->res);
  23         os_free(res);
  24 }
  25
  26
  27 const char * event_to_string(enum wpa_event_type event)
  28 {
  29 #define E2S(n) case EVENT_ ## n: return #n
  30         switch (event) {
  31         E2S(ASSOC);
  32         E2S(DISASSOC);
  33         E2S(MICHAEL_MIC_FAILURE);
  34         E2S(SCAN_RESULTS);
  35         E2S(ASSOCINFO);
  36         E2S(INTERFACE_STATUS);
  37         E2S(PMKID_CANDIDATE);
  38         E2S(STKSTART);
  39         E2S(TDLS);
  40         E2S(FT_RESPONSE);
  41         E2S(IBSS_RSN_START);
  42         E2S(AUTH);
  43         E2S(DEAUTH);
  44         E2S(ASSOC_REJECT);
  45         E2S(AUTH_TIMED_OUT);
  46         E2S(ASSOC_TIMED_OUT);
  47         E2S(WPS_BUTTON_PUSHED);
  48         E2S(TX_STATUS);
  49         E2S(RX_FROM_UNKNOWN);
  50         E2S(RX_MGMT);
  51         E2S(REMAIN_ON_CHANNEL);
  52         E2S(CANCEL_REMAIN_ON_CHANNEL);
  53         E2S(RX_PROBE_REQ);
  54         E2S(NEW_STA);
  55         E2S(EAPOL_RX);
  56         E2S(SIGNAL_CHANGE);
  57         E2S(INTERFACE_ENABLED);
  58         E2S(INTERFACE_DISABLED);
  59         E2S(CHANNEL_LIST_CHANGED);
  60         E2S(INTERFACE_UNAVAILABLE);
  61         E2S(BEST_CHANNEL);
  62         E2S(UNPROT_DEAUTH);
  63         E2S(UNPROT_DISASSOC);
  64         E2S(STATION_LOW_ACK);
  65         E2S(IBSS_PEER_LOST);
  66         E2S(DRIVER_GTK_REKEY);
  67         E2S(SCHED_SCAN_STOPPED);
  68         E2S(DRIVER_CLIENT_POLL_OK);
  69         E2S(EAPOL_TX_STATUS);
  70         E2S(CH_SWITCH);
  71         E2S(WNM);
  72         E2S(CONNECT_FAILED_REASON);
  73         E2S(DFS_RADAR_DETECTED);
  74         E2S(DFS_CAC_FINISHED);
  75         E2S(DFS_CAC_ABORTED);
  76         E2S(DFS_NOP_FINISHED);
  77         E2S(SURVEY);
  78         E2S(SCAN_STARTED);
  79         E2S(AVOID_FREQUENCIES);
  80         E2S(NEW_PEER_CANDIDATE);
  81         E2S(ACS_CHANNEL_SELECTED);
  82         }
  83
  84         return "UNKNOWN";
  85 #undef E2S
  86 }
  87
  88
  89 const char * channel_width_to_string(enum chan_width width)
  90 {
  91         switch (width) {
  92         case CHAN_WIDTH_20_NOHT:
  93                 return "20 MHz (no HT)";
  94         case CHAN_WIDTH_20:
  95                 return "20 MHz";
  96         case CHAN_WIDTH_40:
  97                 return "40 MHz";
  98         case CHAN_WIDTH_80:
  99                 return "80 MHz";
 100         case CHAN_WIDTH_80P80:
 101                 return "80+80 MHz";
 102         case CHAN_WIDTH_160:
 103                 return "160 MHz";
 104         default:
 105                 return "unknown";
 106         }
 107 }
 108
 109
 110 int ht_supported(const struct hostapd_hw_modes *mode)
 111 {
 112         if (!(mode->flags & HOSTAPD_MODE_FLAG_HT_INFO_KNOWN)) {
 113                 /*
 114                  * The driver did not indicate whether it supports HT. Assume
 115                  * it does to avoid connection issues.
 116                  */
 117                 return 1;
 118         }
 119
 120         /*
 121          * IEEE Std 802.11n-2009 20.1.1:
 122          * An HT non-AP STA shall support all EQM rates for one spatial stream.
 123          */
 124         return mode->mcs_set[0] == 0xff;
 125 }
 126
 127
 128 int vht_supported(const struct hostapd_hw_modes *mode)
 129 {
 130         if (!(mode->flags & HOSTAPD_MODE_FLAG_VHT_INFO_KNOWN)) {
 131                 /*
 132                  * The driver did not indicate whether it supports VHT. Assume
 133                  * it does to avoid connection issues.
 134                  */
 135                 return 1;
 136         }
 137
 138         /*
 139          * A VHT non-AP STA shall support MCS 0-7 for one spatial stream.
 140          * TODO: Verify if this complies with the standard
 141          */
 142         return (mode->vht_mcs_set[0] & 0x3) != 3;
 143 }
 144
 145
 146 static int wpa_check_wowlan_trigger(const char *start, const char *trigger,
 147                                     int capa_trigger, u8 *param_trigger)
 148 {
 149         if (os_strcmp(start, trigger) != 0)
 150                 return 0;
 151         if (!capa_trigger)
 152                 return 0;
 153
 154         *param_trigger = 1;
 155         return 1;
 156 }
 157
 158
 159 struct wowlan_triggers *
 160 wpa_get_wowlan_triggers(const char *wowlan_triggers,
 161                         const struct wpa_driver_capa *capa)
 162 {
 163         struct wowlan_triggers *triggers;
 164         char *start, *end, *buf;
 165         int last;
 166
 167         if (!wowlan_triggers)
 168                 return NULL;
 169
 170         buf = os_strdup(wowlan_triggers);
 171         if (buf == NULL)
 172                 return NULL;
 173
 174         triggers = os_zalloc(sizeof(*triggers));
 175         if (triggers == NULL)
 176                 goto out;
 177
 178 #define CHECK_TRIGGER(trigger) \
 179         wpa_check_wowlan_trigger(start, #trigger,                       \
 180                                   capa->wowlan_triggers.trigger,        \
 181                                   &triggers->trigger)
 182
 183         start = buf;
 184         while (*start != '\0') {
 185                 while (isblank(*start))
 186                         start++;
 187                 if (*start == '\0')
 188                         break;
 189                 end = start;
 190                 while (!isblank(*end) && *end != '\0')
 191                         end++;
 192                 last = *end == '\0';
 193                 *end = '\0';
 194
 195                 if (!CHECK_TRIGGER(any) &&
 196                     !CHECK_TRIGGER(disconnect) &&
 197                     !CHECK_TRIGGER(magic_pkt) &&
 198                     !CHECK_TRIGGER(gtk_rekey_failure) &&
 199                     !CHECK_TRIGGER(eap_identity_req) &&
 200                     !CHECK_TRIGGER(four_way_handshake) &&
 201                     !CHECK_TRIGGER(rfkill_release)) {
 202                         wpa_printf(MSG_DEBUG,
 203                                    "Unknown/unsupported wowlan trigger '%s'",
 204                                    start);
 205                         os_free(triggers);
 206                         triggers = NULL;
 207                         goto out;
 208                 }
 209
 210                 if (last)
 211                         break;
 212                 start = end + 1;
 213         }
 214 #undef CHECK_TRIGGER
 215
 216 out:
 217         os_free(buf);
 218         return triggers;
 219 }