src/ap/drv_callbacks.c

   1 /*
   2  * hostapd / Callback functions for driver wrappers
   3  * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "radius/radius.h"
  19 #include "ap/hostapd.h"
  20 #include "ap/ieee802_11.h"
  21 #include "ap/sta_info.h"
  22 #include "ap/accounting.h"
  23 #include "ap/tkip_countermeasures.h"
  24 #include "ap/iapp.h"
  25 #include "ap/ieee802_1x.h"
  26 #include "ap/wpa.h"
  27 #include "ap/wmm.h"
  28 #include "ap/wps_hostapd.h"
  29 #include "driver_i.h"
  30
  31
  32 int hostapd_notif_new_sta(struct hostapd_data *hapd, const u8 *addr)
  33 {
  34         struct sta_info *sta = ap_get_sta(hapd, addr);
  35         if (sta)
  36                 return 0;
  37
  38         wpa_printf(MSG_DEBUG, "Data frame from unknown STA " MACSTR
  39                    " - adding a new STA", MAC2STR(addr));
  40         sta = ap_sta_add(hapd, addr);
  41         if (sta) {
  42                 hostapd_new_assoc_sta(hapd, sta, 0);
  43         } else {
  44                 wpa_printf(MSG_DEBUG, "Failed to add STA entry for " MACSTR,
  45                            MAC2STR(addr));
  46                 return -1;
  47         }
  48
  49         return 0;
  50 }
  51
  52
  53 int hostapd_notif_assoc(struct hostapd_data *hapd, const u8 *addr,
  54                         const u8 *ie, size_t ielen)
  55 {
  56         struct sta_info *sta;
  57         int new_assoc, res;
  58
  59         hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
  60                        HOSTAPD_LEVEL_INFO, "associated");
  61
  62         sta = ap_get_sta(hapd, addr);
  63         if (sta) {
  64                 accounting_sta_stop(hapd, sta);
  65         } else {
  66                 sta = ap_sta_add(hapd, addr);
  67                 if (sta == NULL)
  68                         return -1;
  69         }
  70         sta->flags &= ~(WLAN_STA_WPS | WLAN_STA_MAYBE_WPS);
  71
  72         if (hapd->conf->wpa) {
  73                 if (ie == NULL || ielen == 0) {
  74                         if (hapd->conf->wps_state) {
  75                                 wpa_printf(MSG_DEBUG, "STA did not include "
  76                                            "WPA/RSN IE in (Re)Association "
  77                                            "Request - possible WPS use");
  78                                 sta->flags |= WLAN_STA_MAYBE_WPS;
  79                                 goto skip_wpa_check;
  80                         }
  81
  82                         wpa_printf(MSG_DEBUG, "No WPA/RSN IE from STA");
  83                         return -1;
  84                 }
  85                 if (hapd->conf->wps_state && ie[0] == 0xdd && ie[1] >= 4 &&
  86                     os_memcmp(ie + 2, "\x00\x50\xf2\x04", 4) == 0) {
  87                         sta->flags |= WLAN_STA_WPS;
  88                         goto skip_wpa_check;
  89                 }
  90
  91                 if (sta->wpa_sm == NULL)
  92                         sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth,
  93                                                         sta->addr);
  94                 if (sta->wpa_sm == NULL) {
  95                         wpa_printf(MSG_ERROR, "Failed to initialize WPA state "
  96                                    "machine");
  97                         return -1;
  98                 }
  99                 res = wpa_validate_wpa_ie(hapd->wpa_auth, sta->wpa_sm,
 100                                           ie, ielen, NULL, 0);
 101                 if (res != WPA_IE_OK) {
 102                         int resp;
 103                         wpa_printf(MSG_DEBUG, "WPA/RSN information element "
 104                                    "rejected? (res %u)", res);
 105                         wpa_hexdump(MSG_DEBUG, "IE", ie, ielen);
 106                         if (res == WPA_INVALID_GROUP)
 107                                 resp = WLAN_REASON_GROUP_CIPHER_NOT_VALID;
 108                         else if (res == WPA_INVALID_PAIRWISE)
 109                                 resp = WLAN_REASON_PAIRWISE_CIPHER_NOT_VALID;
 110                         else if (res == WPA_INVALID_AKMP)
 111                                 resp = WLAN_REASON_AKMP_NOT_VALID;
 112 #ifdef CONFIG_IEEE80211W
 113                         else if (res == WPA_MGMT_FRAME_PROTECTION_VIOLATION)
 114                                 resp = WLAN_REASON_INVALID_IE;
 115                         else if (res == WPA_INVALID_MGMT_GROUP_CIPHER)
 116                                 resp = WLAN_REASON_GROUP_CIPHER_NOT_VALID;
 117 #endif /* CONFIG_IEEE80211W */
 118                         else
 119                                 resp = WLAN_REASON_INVALID_IE;
 120                         hapd->drv.sta_disassoc(hapd, sta->addr, resp);
 121                         ap_free_sta(hapd, sta);
 122                         return -1;
 123                 }
 124         } else if (hapd->conf->wps_state) {
 125                 if (ie && ielen > 4 && ie[0] == 0xdd && ie[1] >= 4 &&
 126                     os_memcmp(ie + 2, "\x00\x50\xf2\x04", 4) == 0) {
 127                         sta->flags |= WLAN_STA_WPS;
 128                 } else
 129                         sta->flags |= WLAN_STA_MAYBE_WPS;
 130         }
 131 skip_wpa_check:
 132
 133         new_assoc = (sta->flags & WLAN_STA_ASSOC) == 0;
 134         sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC;
 135         wpa_auth_sm_event(sta->wpa_sm, WPA_ASSOC);
 136
 137         hostapd_new_assoc_sta(hapd, sta, !new_assoc);
 138
 139         ieee802_1x_notify_port_enabled(sta->eapol_sm, 1);
 140
 141         return 0;
 142 }
 143
 144
 145 void hostapd_notif_disassoc(struct hostapd_data *hapd, const u8 *addr)
 146 {
 147         struct sta_info *sta;
 148
 149         hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
 150                        HOSTAPD_LEVEL_INFO, "disassociated");
 151
 152         sta = ap_get_sta(hapd, addr);
 153         if (sta == NULL) {
 154                 wpa_printf(MSG_DEBUG, "Disassociation notification for "
 155                            "unknown STA " MACSTR, MAC2STR(addr));
 156                 return;
 157         }
 158
 159         sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
 160         wpa_auth_sm_event(sta->wpa_sm, WPA_DISASSOC);
 161         sta->acct_terminate_cause = RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST;
 162         ieee802_1x_notify_port_enabled(sta->eapol_sm, 0);
 163         ap_free_sta(hapd, sta);
 164 }
 165
 166
 167 void hostapd_eapol_receive(struct hostapd_data *hapd, const u8 *sa,
 168                            const u8 *buf, size_t len)
 169 {
 170         ieee802_1x_receive(hapd, sa, buf, len);
 171 }
 172
 173
 174 struct hostapd_data * hostapd_sta_get_bss(struct hostapd_data *hapd,
 175                                           const u8 *addr)
 176 {
 177         struct hostapd_iface *iface = hapd->iface;
 178         size_t j;
 179
 180         for (j = 0; j < iface->num_bss; j++) {
 181                 hapd = iface->bss[j];
 182                 if (ap_get_sta(hapd, addr))
 183                         return hapd;
 184         }
 185
 186         return NULL;
 187 }
 188
 189
 190 #ifdef HOSTAPD
 191
 192 #ifdef NEED_AP_MLME
 193
 194 static const u8 * get_hdr_bssid(const struct ieee80211_hdr *hdr, size_t len)
 195 {
 196         u16 fc, type, stype;
 197
 198         /*
 199          * PS-Poll frames are 16 bytes. All other frames are
 200          * 24 bytes or longer.
 201          */
 202         if (len < 16)
 203                 return NULL;
 204
 205         fc = le_to_host16(hdr->frame_control);
 206         type = WLAN_FC_GET_TYPE(fc);
 207         stype = WLAN_FC_GET_STYPE(fc);
 208
 209         switch (type) {
 210         case WLAN_FC_TYPE_DATA:
 211                 if (len < 24)
 212                         return NULL;
 213                 switch (fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) {
 214                 case WLAN_FC_FROMDS | WLAN_FC_TODS:
 215                 case WLAN_FC_TODS:
 216                         return hdr->addr1;
 217                 case WLAN_FC_FROMDS:
 218                         return hdr->addr2;
 219                 default:
 220                         return NULL;
 221                 }
 222         case WLAN_FC_TYPE_CTRL:
 223                 if (stype != WLAN_FC_STYPE_PSPOLL)
 224                         return NULL;
 225                 return hdr->addr1;
 226         case WLAN_FC_TYPE_MGMT:
 227                 return hdr->addr3;
 228         default:
 229                 return NULL;
 230         }
 231 }
 232
 233
 234 #define HAPD_BROADCAST ((struct hostapd_data *) -1)
 235
 236 static struct hostapd_data * get_hapd_bssid(struct hostapd_iface *iface,
 237                                             const u8 *bssid)
 238 {
 239         size_t i;
 240
 241         if (bssid == NULL)
 242                 return NULL;
 243         if (bssid[0] == 0xff && bssid[1] == 0xff && bssid[2] == 0xff &&
 244             bssid[3] == 0xff && bssid[4] == 0xff && bssid[5] == 0xff)
 245                 return HAPD_BROADCAST;
 246
 247         for (i = 0; i < iface->num_bss; i++) {
 248                 if (os_memcmp(bssid, iface->bss[i]->own_addr, ETH_ALEN) == 0)
 249                         return iface->bss[i];
 250         }
 251
 252         return NULL;
 253 }
 254
 255
 256 static void hostapd_rx_from_unknown_sta(struct hostapd_data *hapd,
 257                                         const struct ieee80211_hdr *hdr,
 258                                         size_t len)
 259 {
 260         u16 fc = le_to_host16(hdr->frame_control);
 261         hapd = get_hapd_bssid(hapd->iface, get_hdr_bssid(hdr, len));
 262         if (hapd == NULL || hapd == HAPD_BROADCAST)
 263                 return;
 264
 265         ieee802_11_rx_from_unknown(hapd, hdr->addr2,
 266                                    (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
 267                                    (WLAN_FC_TODS | WLAN_FC_FROMDS));
 268 }
 269
 270
 271 static void hostapd_mgmt_rx(struct hostapd_data *hapd, const u8 *buf,
 272                             size_t len, struct hostapd_frame_info *fi)
 273 {
 274         struct hostapd_iface *iface = hapd->iface;
 275         const struct ieee80211_hdr *hdr;
 276         const u8 *bssid;
 277
 278         hdr = (const struct ieee80211_hdr *) buf;
 279         bssid = get_hdr_bssid(hdr, len);
 280         if (bssid == NULL)
 281                 return;
 282
 283         hapd = get_hapd_bssid(iface, bssid);
 284         if (hapd == NULL) {
 285                 u16 fc;
 286                 fc = le_to_host16(hdr->frame_control);
 287
 288                 /*
 289                  * Drop frames to unknown BSSIDs except for Beacon frames which
 290                  * could be used to update neighbor information.
 291                  */
 292                 if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
 293                     WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_BEACON)
 294                         hapd = iface->bss[0];
 295                 else
 296                         return;
 297         }
 298
 299         if (hapd == HAPD_BROADCAST) {
 300                 size_t i;
 301                 for (i = 0; i < iface->num_bss; i++)
 302                         ieee802_11_mgmt(iface->bss[i], buf, len, fi);
 303         } else
 304                 ieee802_11_mgmt(hapd, buf, len, fi);
 305 }
 306
 307
 308 static void hostapd_mgmt_tx_cb(struct hostapd_data *hapd, const u8 *buf,
 309                                size_t len, u16 stype, int ok)
 310 {
 311         struct ieee80211_hdr *hdr;
 312         hdr = (struct ieee80211_hdr *) buf;
 313         hapd = get_hapd_bssid(hapd->iface, get_hdr_bssid(hdr, len));
 314         if (hapd == NULL || hapd == HAPD_BROADCAST)
 315                 return;
 316         ieee802_11_mgmt_cb(hapd, buf, len, stype, ok);
 317 }
 318
 319 #endif /* NEED_AP_MLME */
 320
 321
 322 void wpa_supplicant_event(void *ctx, wpa_event_type event,
 323                           union wpa_event_data *data)
 324 {
 325         struct hostapd_data *hapd = ctx;
 326
 327         switch (event) {
 328         case EVENT_MICHAEL_MIC_FAILURE:
 329                 michael_mic_failure(hapd, data->michael_mic_failure.src, 1);
 330                 break;
 331         case EVENT_SCAN_RESULTS:
 332                 if (hapd->iface->scan_cb)
 333                         hapd->iface->scan_cb(hapd->iface);
 334                 break;
 335 #ifdef CONFIG_IEEE80211R
 336         case EVENT_FT_RRB_RX:
 337                 wpa_ft_rrb_rx(hapd->wpa_auth, data->ft_rrb_rx.src,
 338                               data->ft_rrb_rx.data, data->ft_rrb_rx.data_len);
 339                 break;
 340 #endif /* CONFIG_IEEE80211R */
 341         case EVENT_WPS_BUTTON_PUSHED:
 342                 hostapd_wps_button_pushed(hapd);
 343                 break;
 344 #ifdef NEED_AP_MLME
 345         case EVENT_TX_STATUS:
 346                 switch (data->tx_status.type) {
 347                 case WLAN_FC_TYPE_MGMT:
 348                         hostapd_mgmt_tx_cb(hapd, data->tx_status.data,
 349                                            data->tx_status.data_len,
 350                                            data->tx_status.stype,
 351                                            data->tx_status.ack);
 352                         break;
 353                 case WLAN_FC_TYPE_DATA:
 354                         hostapd_tx_status(hapd, data->tx_status.dst,
 355                                           data->tx_status.data,
 356                                           data->tx_status.data_len,
 357                                           data->tx_status.ack);
 358                         break;
 359                 }
 360                 break;
 361         case EVENT_RX_FROM_UNKNOWN:
 362                 hostapd_rx_from_unknown_sta(hapd, data->rx_from_unknown.hdr,
 363                                             data->rx_from_unknown.len);
 364                 break;
 365         case EVENT_RX_MGMT:
 366                 hostapd_mgmt_rx(hapd, data->rx_mgmt.frame,
 367                                 data->rx_mgmt.frame_len, data->rx_mgmt.fi);
 368                 break;
 369 #endif /* NEED_AP_MLME */
 370         default:
 371                 wpa_printf(MSG_DEBUG, "Unknown event %d", event);
 372                 break;
 373         }
 374 }
 375
 376 #endif /* HOSTAPD */
 377
 378
 379 void hostapd_probe_req_rx(struct hostapd_data *hapd, const u8 *sa,
 380                          const u8 *ie, size_t ie_len)
 381 {
 382         size_t i;
 383
 384         for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
 385                 hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
 386                                         sa, ie, ie_len);
 387 }