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 Index: wpa_supplicant-0.6.3/wpa_supplicant/config.h
   4 ===================================================================
   5 --- wpa_supplicant-0.6.3.orig/wpa_supplicant/config.h   2008-02-23 03:45:24.000000000 +0100
   6 +++ wpa_supplicant-0.6.3/wpa_supplicant/config.h        2008-07-10 15:08:21.000000000 +0200
   7 @@ -97,6 +97,12 @@
   8         int ap_scan;
   9
  10         /**
  11 +        * scan_cache - controls the time in seconds after the last scan results
  12 +        * before a new scan may be initiated
  13 +        */
  14 +       int scan_cache;
  15 +
  16 +       /**
  17          * ctrl_interface - Parameters for the control interface
  18          *
  19          * If this is specified, %wpa_supplicant will open a control interface
  20 Index: wpa_supplicant-0.6.3/wpa_supplicant/config_file.c
  21 ===================================================================
  22 --- wpa_supplicant-0.6.3.orig/wpa_supplicant/config_file.c      2008-02-23 03:45:24.000000000 +0100
  23 +++ wpa_supplicant-0.6.3/wpa_supplicant/config_file.c   2008-07-10 15:59:38.000000000 +0200
  24 @@ -312,6 +312,13 @@
  25         return 0;
  26  }
  27
  28 +static int wpa_config_process_scan_cache(struct wpa_config *config, char *pos)
  29 +{
  30 +       config->scan_cache = atoi(pos);
  31 +       wpa_printf(MSG_DEBUG, "scan_cache=%d", config->scan_cache);
  32 +       return 0;
  33 +}
  34 +
  35
  36  static int wpa_config_process_fast_reauth(struct wpa_config *config, char *pos)
  37  {
  38 @@ -445,6 +452,9 @@
  39         if (os_strncmp(pos, "ap_scan=", 8) == 0)
  40                 return wpa_config_process_ap_scan(config, pos + 8);
  41
  42 +       if (os_strncmp(pos, "scan_cache=", 11) == 0)
  43 +               return wpa_config_process_scan_cache(config, pos + 11);
  44 +
  45         if (os_strncmp(pos, "fast_reauth=", 12) == 0)
  46                 return wpa_config_process_fast_reauth(config, pos + 12);
  47
  48 @@ -810,6 +820,8 @@
  49                 fprintf(f, "eapol_version=%d\n", config->eapol_version);
  50         if (config->ap_scan != DEFAULT_AP_SCAN)
  51                 fprintf(f, "ap_scan=%d\n", config->ap_scan);
  52 +       if (config->scan_cache != 0)
  53 +               fprintf(f, "scan_cache=%d\n", config->scan_cache);
  54         if (config->fast_reauth != DEFAULT_FAST_REAUTH)
  55                 fprintf(f, "fast_reauth=%d\n", config->fast_reauth);
  56  #ifdef EAP_TLS_OPENSSL
  57 Index: wpa_supplicant-0.6.3/wpa_supplicant/events.c
  58 ===================================================================
  59 --- wpa_supplicant-0.6.3.orig/wpa_supplicant/events.c   2008-07-10 13:27:03.000000000 +0200
  60 +++ wpa_supplicant-0.6.3/wpa_supplicant/events.c        2008-07-10 17:18:53.000000000 +0200
  61 @@ -555,6 +555,9 @@
  62         if (wpa_s->conf->ap_scan == 2 || wpa_s->disconnected)
  63                 return;
  64
  65 +       if (wpa_s->wpa_state > WPA_ASSOCIATED)
  66 +               goto done;
  67 +
  68         while (selected == NULL) {
  69                 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
  70                         selected = wpa_supplicant_select_bss(
  71 @@ -594,13 +597,16 @@
  72                 rsn_preauth_scan_results(wpa_s->wpa, wpa_s->scan_res);
  73         } else {
  74                 wpa_printf(MSG_DEBUG, "No suitable AP found.");
  75 -               timeout = 5;
  76 +               timeout = 1;
  77                 goto req_scan;
  78         }
  79
  80 +done:
  81 +       os_get_time(&wpa_s->last_scan_results);
  82         return;
  83
  84  req_scan:
  85 +       memset(&wpa_s->last_scan_results, 0, sizeof(wpa_s->last_scan_results));
  86         if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) {
  87                 /*
  88                  * Quick recovery if the initial scan results were not
  89 @@ -804,6 +810,9 @@
  90         }
  91         if (wpa_s->wpa_state >= WPA_ASSOCIATED)
  92                 wpa_supplicant_req_scan(wpa_s, 0, 100000);
  93 +       else if (wpa_s->wpa_state == WPA_ASSOCIATING)
  94 +               wpa_supplicant_req_auth_timeout(wpa_s, 0, 100000);
  95 +
  96         bssid = wpa_s->bssid;
  97         if (os_memcmp(bssid, "\x00\x00\x00\x00\x00\x00", ETH_ALEN) == 0)
  98                 bssid = wpa_s->pending_bssid;
  99 Index: wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant_i.h
 100 ===================================================================
 101 --- wpa_supplicant-0.6.3.orig/wpa_supplicant/wpa_supplicant_i.h 2008-07-10 15:03:56.000000000 +0200
 102 +++ wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant_i.h      2008-07-10 15:16:17.000000000 +0200
 103 @@ -334,6 +334,7 @@
 104         struct wpa_client_mlme mlme;
 105         int use_client_mlme;
 106         int driver_4way_handshake;
 107 +       struct os_time last_scan_results;
 108  };
 109
 110
 111 @@ -381,6 +382,7 @@
 112
 113  /* scan.c */
 114  void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec);
 115 +int wpa_supplicant_may_scan(struct wpa_supplicant *wpa_s);
 116  void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s);
 117
 118  /* events.c */
 119 Index: wpa_supplicant-0.6.3/wpa_supplicant/scan.c
 120 ===================================================================
 121 --- wpa_supplicant-0.6.3.orig/wpa_supplicant/scan.c     2008-07-10 13:27:03.000000000 +0200
 122 +++ wpa_supplicant-0.6.3/wpa_supplicant/scan.c  2008-07-10 16:24:31.000000000 +0200
 123 @@ -40,6 +40,18 @@
 124         wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
 125  }
 126
 127 +int wpa_supplicant_may_scan(struct wpa_supplicant *wpa_s)
 128 +{
 129 +       struct os_time time;
 130 +
 131 +       if (wpa_s->conf->scan_cache > 0) {
 132 +               os_get_time(&time);
 133 +               time.sec -= wpa_s->conf->scan_cache;
 134 +               if (os_time_before(&time, &wpa_s->last_scan_results))
 135 +                       return 0;
 136 +       }
 137 +       return 1;
 138 +}
 139
 140  static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 141  {
 142 @@ -150,8 +162,9 @@
 143         } else
 144                 wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
 145
 146 -       if (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
 147 -           !wpa_s->use_client_mlme) {
 148 +       if (!wpa_supplicant_may_scan(wpa_s) ||
 149 +               (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
 150 +           !wpa_s->use_client_mlme)) {
 151                 wpa_s->scan_res_tried++;
 152                 wpa_printf(MSG_DEBUG, "Trying to get current scan results "
 153                            "first without requesting a new scan to speed up "
 154 Index: wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant.c
 155 ===================================================================
 156 --- wpa_supplicant-0.6.3.orig/wpa_supplicant/wpa_supplicant.c   2008-07-10 14:41:16.000000000 +0200
 157 +++ wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant.c        2008-07-10 18:45:59.000000000 +0200
 158 @@ -1417,6 +1417,9 @@
 159  {
 160         struct wpa_supplicant *wpa_s = ctx;
 161
 162 +       if (wpa_s->wpa_state < WPA_ASSOCIATING)
 163 +               return;
 164 +
 165         wpa_printf(MSG_DEBUG, "RX EAPOL from " MACSTR, MAC2STR(src_addr));
 166         wpa_hexdump(MSG_MSGDUMP, "RX EAPOL", buf, len);
 167