wpa_supplicant/wnm_sta.c

   1 /*
   2  * wpa_supplicant - WNM
   3  * Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "common/ieee802_11_defs.h"
  13 #include "rsn_supp/wpa.h"
  14 #include "../wpa_supplicant/wpa_supplicant_i.h"
  15 #include "../wpa_supplicant/driver_i.h"
  16
  17 #define MAX_TFS_IE_LEN  1024
  18
  19 #ifdef CONFIG_IEEE80211V
  20
  21 /* get the TFS IE from driver */
  22 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
  23                                    u16 *buf_len, enum wnm_oper oper)
  24 {
  25         wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
  26
  27         return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
  28 }
  29
  30
  31 /* set the TFS IE to driver */
  32 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
  33                                    const u8 *addr, u8 *buf, u16 *buf_len,
  34                                    enum wnm_oper oper)
  35 {
  36         wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
  37
  38         return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len);
  39 }
  40
  41
  42 /* MLME-SLEEPMODE.request */
  43 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
  44                                  u8 action, u8 intval)
  45 {
  46         struct ieee80211_mgmt *mgmt;
  47         int res;
  48         size_t len;
  49         struct wnm_sleep_element *wnmsleep_ie;
  50         u8 *wnmtfs_ie;
  51         u8 wnmsleep_ie_len;
  52         u16 wnmtfs_ie_len;  /* possibly multiple IE(s) */
  53         enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
  54                 WNM_SLEEP_TFS_REQ_IE_NONE;
  55
  56         /* WNM-Sleep Mode IE */
  57         wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
  58         wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
  59         if (wnmsleep_ie == NULL)
  60                 return -1;
  61         wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
  62         wnmsleep_ie->len = wnmsleep_ie_len - 2;
  63         wnmsleep_ie->action_type = action;
  64         wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
  65         wnmsleep_ie->intval = intval;
  66
  67         /* TFS IE(s) */
  68         wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
  69         if (wnmtfs_ie == NULL) {
  70                 os_free(wnmsleep_ie);
  71                 return -1;
  72         }
  73         if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
  74                                     tfs_oper)) {
  75                 wnmtfs_ie_len = 0;
  76                 os_free(wnmtfs_ie);
  77                 wnmtfs_ie = NULL;
  78         }
  79
  80         mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
  81         if (mgmt == NULL) {
  82                 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
  83                            "WNM-Sleep Request action frame");
  84                 return -1;
  85         }
  86
  87         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
  88         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
  89         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
  90         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
  91                                            WLAN_FC_STYPE_ACTION);
  92         mgmt->u.action.category = WLAN_ACTION_WNM;
  93         mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
  94         os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
  95                   wnmsleep_ie_len);
  96         /* copy TFS IE here */
  97         if (wnmtfs_ie_len > 0) {
  98                 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
  99                           wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
 100         }
 101
 102         len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
 103                 wnmtfs_ie_len;
 104
 105         res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 106                                   wpa_s->own_addr, wpa_s->bssid,
 107                                   &mgmt->u.action.category, len, 0);
 108         if (res < 0)
 109                 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
 110                            "(action=%d, intval=%d)", action, intval);
 111
 112         os_free(wnmsleep_ie);
 113         os_free(wnmtfs_ie);
 114         os_free(mgmt);
 115
 116         return res;
 117 }
 118
 119
 120 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
 121                                         const u8 *frm, int len)
 122 {
 123         /*
 124          * Action [1] | Diaglog Token [1] | Key Data Len [2] | Key Data |
 125          * WNM-Sleep Mode IE | TFS Response IE
 126          */
 127         u8 *pos = (u8 *) frm; /* point to action field */
 128         u16 key_len_total = le_to_host16(*((u16 *)(frm+2)));
 129         u8 gtk_len;
 130         struct wnm_sleep_element *wnmsleep_ie = NULL;
 131         /* multiple TFS Resp IE (assuming consecutive) */
 132         u8 *tfsresp_ie_start = NULL;
 133         u8 *tfsresp_ie_end = NULL;
 134         u16 tfsresp_ie_len = 0;
 135
 136         wpa_printf(MSG_DEBUG, "action=%d token = %d key_len_total = %d",
 137                    frm[0], frm[1], key_len_total);
 138         pos += 4 + key_len_total;
 139         while (pos - frm < len) {
 140                 u8 ie_len = *(pos + 1);
 141                 if (*pos == WLAN_EID_WNMSLEEP)
 142                         wnmsleep_ie = (struct wnm_sleep_element *) pos;
 143                 else if (*pos == WLAN_EID_TFS_RESP) {
 144                         if (!tfsresp_ie_start)
 145                                 tfsresp_ie_start = pos;
 146                         tfsresp_ie_end = pos;
 147                 } else
 148                         wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
 149                 pos += ie_len + 2;
 150         }
 151
 152         if (!wnmsleep_ie) {
 153                 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
 154                 return;
 155         }
 156
 157         if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT) {
 158                 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
 159                            "frame (action=%d, intval=%d)",
 160                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 161                 if (wnmsleep_ie->action_type == 0) {
 162                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
 163                                          wpa_s->bssid, NULL, NULL);
 164                         /* remove GTK/IGTK ?? */
 165
 166                         /* set the TFS Resp IE(s) */
 167                         if (tfsresp_ie_start && tfsresp_ie_end &&
 168                             tfsresp_ie_end - tfsresp_ie_start >= 0) {
 169                                 tfsresp_ie_len = (tfsresp_ie_end +
 170                                                   tfsresp_ie_end[1] + 2) -
 171                                         tfsresp_ie_start;
 172                                 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
 173                                 /*
 174                                  * pass the TFS Resp IE(s) to driver for
 175                                  * processing
 176                                  */
 177                                 if (ieee80211_11_set_tfs_ie(
 178                                             wpa_s, wpa_s->bssid,
 179                                             tfsresp_ie_start,
 180                                             &tfsresp_ie_len,
 181                                             WNM_SLEEP_TFS_RESP_IE_SET))
 182                                         wpa_printf(MSG_DEBUG, "Fail to set "
 183                                                    "TFS Resp IE");
 184                         }
 185                 } else if (wnmsleep_ie->action_type == 1) {
 186                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM,
 187                                          wpa_s->bssid, NULL, NULL);
 188                         /* Install GTK/IGTK */
 189                         do {
 190                                 /* point to key data field */
 191                                 u8 *ptr = (u8 *) frm + 1 + 1 + 2;
 192                                 while (ptr < (u8 *) frm + 4 + key_len_total) {
 193                                         if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
 194                                                 gtk_len = *(ptr + 4);
 195                                                 wpa_wnmsleep_install_key(
 196                                                         wpa_s->wpa,
 197                                                         WNM_SLEEP_SUBELEM_GTK,
 198                                                         ptr);
 199                                                 ptr += 13 + gtk_len;
 200 #ifdef CONFIG_IEEE80211W
 201                                         } else if (*ptr ==
 202                                                    WNM_SLEEP_SUBELEM_IGTK) {
 203                                                 wpa_wnmsleep_install_key(
 204                                                         wpa_s->wpa,
 205                                                         WNM_SLEEP_SUBELEM_IGTK,
 206                                                         ptr);
 207                                                 ptr += 10 + WPA_IGTK_LEN;
 208 #endif /* CONFIG_IEEE80211W */
 209                                         } else
 210                                                 break; /* skip the loop */
 211                                 }
 212                         } while(0);
 213                 }
 214         } else {
 215                 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
 216                            "(action=%d, intval=%d)",
 217                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 218                 if (wnmsleep_ie->action_type == 0)
 219                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
 220                                          wpa_s->bssid, NULL, NULL);
 221                 else if (wnmsleep_ie->action_type == 1)
 222                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
 223                                          wpa_s->bssid, NULL, NULL);
 224         }
 225 }
 226
 227
 228 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 229                               struct rx_action *action)
 230 {
 231         u8 *pos = (u8 *) action->data; /* point to action field */
 232         u8 act = *pos++;
 233         /* u8 dialog_token = *pos++; */
 234
 235         switch (act) {
 236         case WNM_SLEEP_MODE_RESP:
 237                 ieee802_11_rx_wnmsleep_resp(wpa_s, action->data, action->len);
 238                 break;
 239         default:
 240                 break;
 241         }
 242 }
 243
 244 #endif /* CONFIG_IEEE80211V */