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_i.h"
  15 #include "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, u16 intval, struct wpabuf *tfs_req)
  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         wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
  57                    "action=%s to " MACSTR,
  58                    action == 0 ? "enter" : "exit",
  59                    MAC2STR(wpa_s->bssid));
  60
  61         /* WNM-Sleep Mode IE */
  62         wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
  63         wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
  64         if (wnmsleep_ie == NULL)
  65                 return -1;
  66         wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
  67         wnmsleep_ie->len = wnmsleep_ie_len - 2;
  68         wnmsleep_ie->action_type = action;
  69         wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
  70         wnmsleep_ie->intval = host_to_le16(intval);
  71         wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
  72                     (u8 *) wnmsleep_ie, wnmsleep_ie_len);
  73
  74         /* TFS IE(s) */
  75         if (tfs_req) {
  76                 wnmtfs_ie_len = wpabuf_len(tfs_req);
  77                 wnmtfs_ie = os_malloc(wnmtfs_ie_len);
  78                 if (wnmtfs_ie == NULL) {
  79                         os_free(wnmsleep_ie);
  80                         return -1;
  81                 }
  82                 os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
  83         } else {
  84                 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
  85                 if (wnmtfs_ie == NULL) {
  86                         os_free(wnmsleep_ie);
  87                         return -1;
  88                 }
  89                 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
  90                                             tfs_oper)) {
  91                         wnmtfs_ie_len = 0;
  92                         os_free(wnmtfs_ie);
  93                         wnmtfs_ie = NULL;
  94                 }
  95         }
  96         wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
  97                     (u8 *) wnmtfs_ie, wnmtfs_ie_len);
  98
  99         mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
 100         if (mgmt == NULL) {
 101                 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
 102                            "WNM-Sleep Request action frame");
 103                 return -1;
 104         }
 105
 106         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 107         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 108         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 109         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 110                                            WLAN_FC_STYPE_ACTION);
 111         mgmt->u.action.category = WLAN_ACTION_WNM;
 112         mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
 113         mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
 114         os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
 115                   wnmsleep_ie_len);
 116         /* copy TFS IE here */
 117         if (wnmtfs_ie_len > 0) {
 118                 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
 119                           wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
 120         }
 121
 122         len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
 123                 wnmtfs_ie_len;
 124
 125         res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 126                                   wpa_s->own_addr, wpa_s->bssid,
 127                                   &mgmt->u.action.category, len, 0);
 128         if (res < 0)
 129                 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
 130                            "(action=%d, intval=%d)", action, intval);
 131
 132         os_free(wnmsleep_ie);
 133         os_free(wnmtfs_ie);
 134         os_free(mgmt);
 135
 136         return res;
 137 }
 138
 139
 140 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
 141                                          u8 *tfsresp_ie_start,
 142                                          u8 *tfsresp_ie_end)
 143 {
 144         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
 145                          wpa_s->bssid, NULL, NULL);
 146         /* remove GTK/IGTK ?? */
 147
 148         /* set the TFS Resp IE(s) */
 149         if (tfsresp_ie_start && tfsresp_ie_end &&
 150             tfsresp_ie_end - tfsresp_ie_start >= 0) {
 151                 u16 tfsresp_ie_len;
 152                 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
 153                         tfsresp_ie_start;
 154                 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
 155                 /* pass the TFS Resp IE(s) to driver for processing */
 156                 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
 157                                             tfsresp_ie_start,
 158                                             &tfsresp_ie_len,
 159                                             WNM_SLEEP_TFS_RESP_IE_SET))
 160                         wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
 161         }
 162 }
 163
 164
 165 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
 166                                         const u8 *frm, u16 key_len_total)
 167 {
 168         u8 *ptr, *end;
 169         u8 gtk_len;
 170
 171         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM,  wpa_s->bssid,
 172                          NULL, NULL);
 173
 174         /* Install GTK/IGTK */
 175
 176         /* point to key data field */
 177         ptr = (u8 *) frm + 1 + 1 + 2;
 178         end = ptr + key_len_total;
 179         wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
 180
 181         while (ptr + 1 < end) {
 182                 if (ptr + 2 + ptr[1] > end) {
 183                         wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
 184                                    "length");
 185                         if (end > ptr) {
 186                                 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
 187                                             ptr, end - ptr);
 188                         }
 189                         break;
 190                 }
 191                 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
 192                         if (ptr[1] < 11 + 5) {
 193                                 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
 194                                            "subelem");
 195                                 break;
 196                         }
 197                         gtk_len = *(ptr + 4);
 198                         if (ptr[1] < 11 + gtk_len ||
 199                             gtk_len < 5 || gtk_len > 32) {
 200                                 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
 201                                            "subelem");
 202                                 break;
 203                         }
 204                         wpa_wnmsleep_install_key(
 205                                 wpa_s->wpa,
 206                                 WNM_SLEEP_SUBELEM_GTK,
 207                                 ptr);
 208                         ptr += 13 + gtk_len;
 209 #ifdef CONFIG_IEEE80211W
 210                 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
 211                         if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
 212                                 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
 213                                            "subelem");
 214                                 break;
 215                         }
 216                         wpa_wnmsleep_install_key(wpa_s->wpa,
 217                                                  WNM_SLEEP_SUBELEM_IGTK, ptr);
 218                         ptr += 10 + WPA_IGTK_LEN;
 219 #endif /* CONFIG_IEEE80211W */
 220                 } else
 221                         break; /* skip the loop */
 222         }
 223 }
 224
 225
 226 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
 227                                         const u8 *frm, int len)
 228 {
 229         /*
 230          * Action [1] | Diaglog Token [1] | Key Data Len [2] | Key Data |
 231          * WNM-Sleep Mode IE | TFS Response IE
 232          */
 233         u8 *pos = (u8 *) frm; /* point to action field */
 234         u16 key_len_total = le_to_host16(*((u16 *)(frm+2)));
 235         struct wnm_sleep_element *wnmsleep_ie = NULL;
 236         /* multiple TFS Resp IE (assuming consecutive) */
 237         u8 *tfsresp_ie_start = NULL;
 238         u8 *tfsresp_ie_end = NULL;
 239
 240         wpa_printf(MSG_DEBUG, "action=%d token = %d key_len_total = %d",
 241                    frm[0], frm[1], key_len_total);
 242         pos += 4 + key_len_total;
 243         if (pos > frm + len) {
 244                 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
 245                 return;
 246         }
 247         while (pos - frm < len) {
 248                 u8 ie_len = *(pos + 1);
 249                 if (pos + 2 + ie_len > frm + len) {
 250                         wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
 251                         break;
 252                 }
 253                 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
 254                 if (*pos == WLAN_EID_WNMSLEEP)
 255                         wnmsleep_ie = (struct wnm_sleep_element *) pos;
 256                 else if (*pos == WLAN_EID_TFS_RESP) {
 257                         if (!tfsresp_ie_start)
 258                                 tfsresp_ie_start = pos;
 259                         tfsresp_ie_end = pos;
 260                 } else
 261                         wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
 262                 pos += ie_len + 2;
 263         }
 264
 265         if (!wnmsleep_ie) {
 266                 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
 267                 return;
 268         }
 269
 270         if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
 271             wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
 272                 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
 273                            "frame (action=%d, intval=%d)",
 274                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 275                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
 276                         wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
 277                                                      tfsresp_ie_end);
 278                 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
 279                         wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
 280                 }
 281         } else {
 282                 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
 283                            "(action=%d, intval=%d)",
 284                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 285                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
 286                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
 287                                          wpa_s->bssid, NULL, NULL);
 288                 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
 289                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
 290                                          wpa_s->bssid, NULL, NULL);
 291         }
 292 }
 293
 294
 295 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 296                               struct rx_action *action)
 297 {
 298         u8 *pos = (u8 *) action->data; /* point to action field */
 299         u8 act = *pos++;
 300         /* u8 dialog_token = *pos++; */
 301
 302         switch (act) {
 303         case WNM_SLEEP_MODE_RESP:
 304                 ieee802_11_rx_wnmsleep_resp(wpa_s, action->data, action->len);
 305                 break;
 306         default:
 307                 break;
 308         }
 309 }
 310
 311 #endif /* CONFIG_IEEE80211V */