package/wpa_supplicant/patches/130-scanning.patch

   1 Add a scan result cache to improve roaming speed if the driver gave us a background scan before losing the connection.
   2
   3 --- a/wpa_supplicant/config.h
   4 +++ b/wpa_supplicant/config.h
   5 @@ -97,6 +97,12 @@
   6         int ap_scan;
   7
   8         /**
   9 +        * scan_cache - controls the time in seconds after the last scan results
  10 +        * before a new scan may be initiated
  11 +        */
  12 +       int scan_cache;
  13 +
  14 +       /**
  15          * ctrl_interface - Parameters for the control interface
  16          *
  17          * If this is specified, %wpa_supplicant will open a control interface
  18 --- a/wpa_supplicant/config_file.c
  19 +++ b/wpa_supplicant/config_file.c
  20 @@ -312,6 +312,13 @@
  21         return 0;
  22  }
  23
  24 +static int wpa_config_process_scan_cache(struct wpa_config *config, char *pos)
  25 +{
  26 +       config->scan_cache = atoi(pos);
  27 +       wpa_printf(MSG_DEBUG, "scan_cache=%d", config->scan_cache);
  28 +       return 0;
  29 +}
  30 +
  31
  32  static int wpa_config_process_fast_reauth(struct wpa_config *config, char *pos)
  33  {
  34 @@ -445,6 +452,9 @@
  35         if (os_strncmp(pos, "ap_scan=", 8) == 0)
  36                 return wpa_config_process_ap_scan(config, pos + 8);
  37
  38 +       if (os_strncmp(pos, "scan_cache=", 11) == 0)
  39 +               return wpa_config_process_scan_cache(config, pos + 11);
  40 +
  41         if (os_strncmp(pos, "fast_reauth=", 12) == 0)
  42                 return wpa_config_process_fast_reauth(config, pos + 12);
  43
  44 @@ -810,6 +820,8 @@
  45                 fprintf(f, "eapol_version=%d\n", config->eapol_version);
  46         if (config->ap_scan != DEFAULT_AP_SCAN)
  47                 fprintf(f, "ap_scan=%d\n", config->ap_scan);
  48 +       if (config->scan_cache != 0)
  49 +               fprintf(f, "scan_cache=%d\n", config->scan_cache);
  50         if (config->fast_reauth != DEFAULT_FAST_REAUTH)
  51                 fprintf(f, "fast_reauth=%d\n", config->fast_reauth);
  52  #ifdef EAP_TLS_OPENSSL
  53 --- a/wpa_supplicant/events.c
  54 +++ b/wpa_supplicant/events.c
  55 @@ -555,6 +555,9 @@
  56         if (wpa_s->conf->ap_scan == 2 || wpa_s->disconnected)
  57                 return;
  58
  59 +       if (wpa_s->wpa_state > WPA_ASSOCIATED)
  60 +               goto done;
  61 +
  62         while (selected == NULL) {
  63                 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
  64                         selected = wpa_supplicant_select_bss(
  65 @@ -567,6 +570,7 @@
  66                         wpa_printf(MSG_DEBUG, "No APs found - clear blacklist "
  67                                    "and try again");
  68                         wpa_blacklist_clear(wpa_s);
  69 +                       memset(&wpa_s->last_scan_results, 0, sizeof(wpa_s->last_scan_results));
  70                 } else if (selected == NULL) {
  71                         break;
  72                 }
  73 @@ -594,10 +598,12 @@
  74                 rsn_preauth_scan_results(wpa_s->wpa, wpa_s->scan_res);
  75         } else {
  76                 wpa_printf(MSG_DEBUG, "No suitable AP found.");
  77 -               timeout = 5;
  78 +               timeout = 0;
  79                 goto req_scan;
  80         }
  81
  82 +done:
  83 +       os_get_time(&wpa_s->last_scan_results);
  84         return;
  85
  86  req_scan:
  87 @@ -804,6 +810,9 @@
  88         }
  89         if (wpa_s->wpa_state >= WPA_ASSOCIATED)
  90                 wpa_supplicant_req_scan(wpa_s, 0, 100000);
  91 +       else if (wpa_s->wpa_state == WPA_ASSOCIATING)
  92 +               wpa_supplicant_req_auth_timeout(wpa_s, 0, 100000);
  93 +
  94         bssid = wpa_s->bssid;
  95         if (os_memcmp(bssid, "\x00\x00\x00\x00\x00\x00", ETH_ALEN) == 0)
  96                 bssid = wpa_s->pending_bssid;
  97 --- a/wpa_supplicant/wpa_supplicant_i.h
  98 +++ b/wpa_supplicant/wpa_supplicant_i.h
  99 @@ -334,6 +334,7 @@
 100         struct wpa_client_mlme mlme;
 101         int use_client_mlme;
 102         int driver_4way_handshake;
 103 +       struct os_time last_scan_results;
 104  };
 105
 106
 107 @@ -381,6 +382,7 @@
 108
 109  /* scan.c */
 110  void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec);
 111 +int wpa_supplicant_may_scan(struct wpa_supplicant *wpa_s);
 112  void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s);
 113
 114  /* events.c */
 115 --- a/wpa_supplicant/scan.c
 116 +++ b/wpa_supplicant/scan.c
 117 @@ -40,6 +40,18 @@
 118         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
 119  }
 120
 121 +int wpa_supplicant_may_scan(struct wpa_supplicant *wpa_s)
 122 +{
 123 +       struct os_time time;
 124 +
 125 +       if (wpa_s->conf->scan_cache > 0) {
 126 +               os_get_time(&time);
 127 +               time.sec -= wpa_s->conf->scan_cache;
 128 +               if (os_time_before(&time, &wpa_s->last_scan_results))
 129 +                       return 0;
 130 +       }
 131 +       return 1;
 132 +}
 133
 134  static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 135  {
 136 @@ -150,8 +162,9 @@
 137         } else
 138                 wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
 139
 140 -       if (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
 141 -           !wpa_s->use_client_mlme) {
 142 +       if (!wpa_supplicant_may_scan(wpa_s) ||
 143 +               (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
 144 +           !wpa_s->use_client_mlme)) {
 145                 wpa_s->scan_res_tried++;
 146                 wpa_printf(MSG_DEBUG, "Trying to get current scan results "
 147                            "first without requesting a new scan to speed up "
 148 --- a/wpa_supplicant/wpa_supplicant.c
 149 +++ b/wpa_supplicant/wpa_supplicant.c
 150 @@ -1417,6 +1417,9 @@
 151  {
 152         struct wpa_supplicant *wpa_s = ctx;
 153
 154 +       if (wpa_s->wpa_state < WPA_ASSOCIATING)
 155 +               return;
 156 +
 157         wpa_printf(MSG_DEBUG, "RX EAPOL from " MACSTR, MAC2STR(src_addr));
 158         wpa_hexdump(MSG_MSGDUMP, "RX EAPOL", buf, len);
 159