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
  20 /* get the TFS IE from driver */
  21 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
  22                                    u16 *buf_len, enum wnm_oper oper)
  23 {
  24         wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
  25
  26         return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
  27 }
  28
  29
  30 /* set the TFS IE to driver */
  31 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
  32                                    const u8 *addr, u8 *buf, u16 *buf_len,
  33                                    enum wnm_oper oper)
  34 {
  35         wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
  36
  37         return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len);
  38 }
  39
  40
  41 /* MLME-SLEEPMODE.request */
  42 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
  43                                  u8 action, u16 intval, struct wpabuf *tfs_req)
  44 {
  45         struct ieee80211_mgmt *mgmt;
  46         int res;
  47         size_t len;
  48         struct wnm_sleep_element *wnmsleep_ie;
  49         u8 *wnmtfs_ie;
  50         u8 wnmsleep_ie_len;
  51         u16 wnmtfs_ie_len;  /* possibly multiple IE(s) */
  52         enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
  53                 WNM_SLEEP_TFS_REQ_IE_NONE;
  54
  55         wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
  56                    "action=%s to " MACSTR,
  57                    action == 0 ? "enter" : "exit",
  58                    MAC2STR(wpa_s->bssid));
  59
  60         /* WNM-Sleep Mode IE */
  61         wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
  62         wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
  63         if (wnmsleep_ie == NULL)
  64                 return -1;
  65         wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
  66         wnmsleep_ie->len = wnmsleep_ie_len - 2;
  67         wnmsleep_ie->action_type = action;
  68         wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
  69         wnmsleep_ie->intval = host_to_le16(intval);
  70         wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
  71                     (u8 *) wnmsleep_ie, wnmsleep_ie_len);
  72
  73         /* TFS IE(s) */
  74         if (tfs_req) {
  75                 wnmtfs_ie_len = wpabuf_len(tfs_req);
  76                 wnmtfs_ie = os_malloc(wnmtfs_ie_len);
  77                 if (wnmtfs_ie == NULL) {
  78                         os_free(wnmsleep_ie);
  79                         return -1;
  80                 }
  81                 os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
  82         } else {
  83                 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
  84                 if (wnmtfs_ie == NULL) {
  85                         os_free(wnmsleep_ie);
  86                         return -1;
  87                 }
  88                 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
  89                                             tfs_oper)) {
  90                         wnmtfs_ie_len = 0;
  91                         os_free(wnmtfs_ie);
  92                         wnmtfs_ie = NULL;
  93                 }
  94         }
  95         wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
  96                     (u8 *) wnmtfs_ie, wnmtfs_ie_len);
  97
  98         mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
  99         if (mgmt == NULL) {
 100                 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
 101                            "WNM-Sleep Request action frame");
 102                 return -1;
 103         }
 104
 105         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 106         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 107         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 108         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 109                                            WLAN_FC_STYPE_ACTION);
 110         mgmt->u.action.category = WLAN_ACTION_WNM;
 111         mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
 112         mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
 113         os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
 114                   wnmsleep_ie_len);
 115         /* copy TFS IE here */
 116         if (wnmtfs_ie_len > 0) {
 117                 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
 118                           wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
 119         }
 120
 121         len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
 122                 wnmtfs_ie_len;
 123
 124         res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 125                                   wpa_s->own_addr, wpa_s->bssid,
 126                                   &mgmt->u.action.category, len, 0);
 127         if (res < 0)
 128                 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
 129                            "(action=%d, intval=%d)", action, intval);
 130
 131         os_free(wnmsleep_ie);
 132         os_free(wnmtfs_ie);
 133         os_free(mgmt);
 134
 135         return res;
 136 }
 137
 138
 139 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
 140                                          u8 *tfsresp_ie_start,
 141                                          u8 *tfsresp_ie_end)
 142 {
 143         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
 144                          wpa_s->bssid, NULL, NULL);
 145         /* remove GTK/IGTK ?? */
 146
 147         /* set the TFS Resp IE(s) */
 148         if (tfsresp_ie_start && tfsresp_ie_end &&
 149             tfsresp_ie_end - tfsresp_ie_start >= 0) {
 150                 u16 tfsresp_ie_len;
 151                 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
 152                         tfsresp_ie_start;
 153                 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
 154                 /* pass the TFS Resp IE(s) to driver for processing */
 155                 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
 156                                             tfsresp_ie_start,
 157                                             &tfsresp_ie_len,
 158                                             WNM_SLEEP_TFS_RESP_IE_SET))
 159                         wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
 160         }
 161 }
 162
 163
 164 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
 165                                         const u8 *frm, u16 key_len_total)
 166 {
 167         u8 *ptr, *end;
 168         u8 gtk_len;
 169
 170         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM,  wpa_s->bssid,
 171                          NULL, NULL);
 172
 173         /* Install GTK/IGTK */
 174
 175         /* point to key data field */
 176         ptr = (u8 *) frm + 1 + 1 + 2;
 177         end = ptr + key_len_total;
 178         wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
 179
 180         while (ptr + 1 < end) {
 181                 if (ptr + 2 + ptr[1] > end) {
 182                         wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
 183                                    "length");
 184                         if (end > ptr) {
 185                                 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
 186                                             ptr, end - ptr);
 187                         }
 188                         break;
 189                 }
 190                 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
 191                         if (ptr[1] < 11 + 5) {
 192                                 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
 193                                            "subelem");
 194                                 break;
 195                         }
 196                         gtk_len = *(ptr + 4);
 197                         if (ptr[1] < 11 + gtk_len ||
 198                             gtk_len < 5 || gtk_len > 32) {
 199                                 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
 200                                            "subelem");
 201                                 break;
 202                         }
 203                         wpa_wnmsleep_install_key(
 204                                 wpa_s->wpa,
 205                                 WNM_SLEEP_SUBELEM_GTK,
 206                                 ptr);
 207                         ptr += 13 + gtk_len;
 208 #ifdef CONFIG_IEEE80211W
 209                 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
 210                         if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
 211                                 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
 212                                            "subelem");
 213                                 break;
 214                         }
 215                         wpa_wnmsleep_install_key(wpa_s->wpa,
 216                                                  WNM_SLEEP_SUBELEM_IGTK, ptr);
 217                         ptr += 10 + WPA_IGTK_LEN;
 218 #endif /* CONFIG_IEEE80211W */
 219                 } else
 220                         break; /* skip the loop */
 221         }
 222 }
 223
 224
 225 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
 226                                         const u8 *frm, int len)
 227 {
 228         /*
 229          * Action [1] | Diaglog Token [1] | Key Data Len [2] | Key Data |
 230          * WNM-Sleep Mode IE | TFS Response IE
 231          */
 232         u8 *pos = (u8 *) frm; /* point to action field */
 233         u16 key_len_total = le_to_host16(*((u16 *)(frm+2)));
 234         struct wnm_sleep_element *wnmsleep_ie = NULL;
 235         /* multiple TFS Resp IE (assuming consecutive) */
 236         u8 *tfsresp_ie_start = NULL;
 237         u8 *tfsresp_ie_end = NULL;
 238
 239         wpa_printf(MSG_DEBUG, "action=%d token = %d key_len_total = %d",
 240                    frm[0], frm[1], key_len_total);
 241         pos += 4 + key_len_total;
 242         if (pos > frm + len) {
 243                 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
 244                 return;
 245         }
 246         while (pos - frm < len) {
 247                 u8 ie_len = *(pos + 1);
 248                 if (pos + 2 + ie_len > frm + len) {
 249                         wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
 250                         break;
 251                 }
 252                 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
 253                 if (*pos == WLAN_EID_WNMSLEEP)
 254                         wnmsleep_ie = (struct wnm_sleep_element *) pos;
 255                 else if (*pos == WLAN_EID_TFS_RESP) {
 256                         if (!tfsresp_ie_start)
 257                                 tfsresp_ie_start = pos;
 258                         tfsresp_ie_end = pos;
 259                 } else
 260                         wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
 261                 pos += ie_len + 2;
 262         }
 263
 264         if (!wnmsleep_ie) {
 265                 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
 266                 return;
 267         }
 268
 269         if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
 270             wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
 271                 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
 272                            "frame (action=%d, intval=%d)",
 273                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 274                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
 275                         wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
 276                                                      tfsresp_ie_end);
 277                 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
 278                         wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
 279                 }
 280         } else {
 281                 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
 282                            "(action=%d, intval=%d)",
 283                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 284                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
 285                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
 286                                          wpa_s->bssid, NULL, NULL);
 287                 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
 288                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
 289                                          wpa_s->bssid, NULL, NULL);
 290         }
 291 }
 292
 293
 294 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 295                               struct rx_action *action)
 296 {
 297         u8 *pos = (u8 *) action->data; /* point to action field */
 298         u8 act = *pos++;
 299         /* u8 dialog_token = *pos++; */
 300
 301         switch (act) {
 302         case WNM_SLEEP_MODE_RESP:
 303                 ieee802_11_rx_wnmsleep_resp(wpa_s, action->data, action->len);
 304                 break;
 305         default:
 306                 break;
 307         }
 308 }