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         E2S(DFS_CAC_STARTED);
  83         E2S(P2P_LO_STOP);
  84         }
  85
  86         return "UNKNOWN";
  87 #undef E2S
  88 }
  89
  90
  91 const char * channel_width_to_string(enum chan_width width)
  92 {
  93         switch (width) {
  94         case CHAN_WIDTH_20_NOHT:
  95                 return "20 MHz (no HT)";
  96         case CHAN_WIDTH_20:
  97                 return "20 MHz";
  98         case CHAN_WIDTH_40:
  99                 return "40 MHz";
 100         case CHAN_WIDTH_80:
 101                 return "80 MHz";
 102         case CHAN_WIDTH_80P80:
 103                 return "80+80 MHz";
 104         case CHAN_WIDTH_160:
 105                 return "160 MHz";
 106         default:
 107                 return "unknown";
 108         }
 109 }
 110
 111
 112 int ht_supported(const struct hostapd_hw_modes *mode)
 113 {
 114         if (!(mode->flags & HOSTAPD_MODE_FLAG_HT_INFO_KNOWN)) {
 115                 /*
 116                  * The driver did not indicate whether it supports HT. Assume
 117                  * it does to avoid connection issues.
 118                  */
 119                 return 1;
 120         }
 121
 122         /*
 123          * IEEE Std 802.11n-2009 20.1.1:
 124          * An HT non-AP STA shall support all EQM rates for one spatial stream.
 125          */
 126         return mode->mcs_set[0] == 0xff;
 127 }
 128
 129
 130 int vht_supported(const struct hostapd_hw_modes *mode)
 131 {
 132         if (!(mode->flags & HOSTAPD_MODE_FLAG_VHT_INFO_KNOWN)) {
 133                 /*
 134                  * The driver did not indicate whether it supports VHT. Assume
 135                  * it does to avoid connection issues.
 136                  */
 137                 return 1;
 138         }
 139
 140         /*
 141          * A VHT non-AP STA shall support MCS 0-7 for one spatial stream.
 142          * TODO: Verify if this complies with the standard
 143          */
 144         return (mode->vht_mcs_set[0] & 0x3) != 3;
 145 }
 146
 147
 148 static int wpa_check_wowlan_trigger(const char *start, const char *trigger,
 149                                     int capa_trigger, u8 *param_trigger)
 150 {
 151         if (os_strcmp(start, trigger) != 0)
 152                 return 0;
 153         if (!capa_trigger)
 154                 return 0;
 155
 156         *param_trigger = 1;
 157         return 1;
 158 }
 159
 160
 161 struct wowlan_triggers *
 162 wpa_get_wowlan_triggers(const char *wowlan_triggers,
 163                         const struct wpa_driver_capa *capa)
 164 {
 165         struct wowlan_triggers *triggers;
 166         char *start, *end, *buf;
 167         int last;
 168
 169         if (!wowlan_triggers)
 170                 return NULL;
 171
 172         buf = os_strdup(wowlan_triggers);
 173         if (buf == NULL)
 174                 return NULL;
 175
 176         triggers = os_zalloc(sizeof(*triggers));
 177         if (triggers == NULL)
 178                 goto out;
 179
 180 #define CHECK_TRIGGER(trigger) \
 181         wpa_check_wowlan_trigger(start, #trigger,                       \
 182                                   capa->wowlan_triggers.trigger,        \
 183                                   &triggers->trigger)
 184
 185         start = buf;
 186         while (*start != '\0') {
 187                 while (isblank((unsigned char) *start))
 188                         start++;
 189                 if (*start == '\0')
 190                         break;
 191                 end = start;
 192                 while (!isblank((unsigned char) *end) && *end != '\0')
 193                         end++;
 194                 last = *end == '\0';
 195                 *end = '\0';
 196
 197                 if (!CHECK_TRIGGER(any) &&
 198                     !CHECK_TRIGGER(disconnect) &&
 199                     !CHECK_TRIGGER(magic_pkt) &&
 200                     !CHECK_TRIGGER(gtk_rekey_failure) &&
 201                     !CHECK_TRIGGER(eap_identity_req) &&
 202                     !CHECK_TRIGGER(four_way_handshake) &&
 203                     !CHECK_TRIGGER(rfkill_release)) {
 204                         wpa_printf(MSG_DEBUG,
 205                                    "Unknown/unsupported wowlan trigger '%s'",
 206                                    start);
 207                         os_free(triggers);
 208                         triggers = NULL;
 209                         goto out;
 210                 }
 211
 212                 if (last)
 213                         break;
 214                 start = end + 1;
 215         }
 216 #undef CHECK_TRIGGER
 217
 218 out:
 219         os_free(buf);
 220         return triggers;
 221 }