key.c
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00001 /*
00002  * Copyright 2002-2005, Instant802 Networks, Inc.
00003  * Copyright 2005-2006, Devicescape Software, Inc.
00004  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
00005  * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
00006  *
00007  * This program is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License version 2 as
00009  * published by the Free Software Foundation.
00010  */
00011 
00012 #include <linux/if_ether.h>
00013 #include <linux/etherdevice.h>
00014 #include <linux/list.h>
00015 #include <linux/rcupdate.h>
00016 #include <linux/rtnetlink.h>
00017 #include <linux/slab.h>
00018 #include <linux/export.h>
00019 #include <net/mac80211.h>
00020 #include <asm/unaligned.h>
00021 #include "ieee80211_i.h"
00022 #include "driver-ops.h"
00023 #include "debugfs_key.h"
00024 #include "aes_ccm.h"
00025 #include "aes_cmac.h"
00026 
00027 
00051 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
00052 
00053 static void assert_key_lock(struct ieee80211_local *local)
00054 {
00055         lockdep_assert_held(&local->key_mtx);
00056 }
00057 
00058 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
00059 {
00060         /*
00061          * When this count is zero, SKB resizing for allocating tailroom
00062          * for IV or MMIC is skipped. But, this check has created two race
00063          * cases in xmit path while transiting from zero count to one:
00064          *
00065          * 1. SKB resize was skipped because no key was added but just before
00066          * the xmit key is added and SW encryption kicks off.
00067          *
00068          * 2. SKB resize was skipped because all the keys were hw planted but
00069          * just before xmit one of the key is deleted and SW encryption kicks
00070          * off.
00071          *
00072          * In both the above case SW encryption will find not enough space for
00073          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
00074          *
00075          * Solution has been explained at
00076          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
00077          */
00078 
00079         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
00080                 /*
00081                  * Flush all XMIT packets currently using HW encryption or no
00082                  * encryption at all if the count transition is from 0 -> 1.
00083                  */
00084                 synchronize_net();
00085         }
00086 }
00087 
00088 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
00089 {
00090         struct ieee80211_sub_if_data *sdata;
00091         struct sta_info *sta;
00092         int ret;
00093 
00094         might_sleep();
00095 
00096         if (!key->local->ops->set_key)
00097                 goto out_unsupported;
00098 
00099         assert_key_lock(key->local);
00100 
00101         sta = key->sta;
00102 
00103         /*
00104          * If this is a per-STA GTK, check if it
00105          * is supported; if not, return.
00106          */
00107         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
00108             !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK))
00109                 goto out_unsupported;
00110 
00111         if (sta && !sta->uploaded)
00112                 goto out_unsupported;
00113 
00114         sdata = key->sdata;
00115         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
00116                 /*
00117                  * The driver doesn't know anything about VLAN interfaces.
00118                  * Hence, don't send GTKs for VLAN interfaces to the driver.
00119                  */
00120                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
00121                         goto out_unsupported;
00122         }
00123 
00124         ret = drv_set_key(key->local, SET_KEY, sdata,
00125                           sta ? &sta->sta : NULL, &key->conf);
00126 
00127         if (!ret) {
00128                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
00129 
00130                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
00131                       (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
00132                       (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
00133                         sdata->crypto_tx_tailroom_needed_cnt--;
00134 
00135                 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
00136                         (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
00137 
00138                 return 0;
00139         }
00140 
00141         if (ret != -ENOSPC && ret != -EOPNOTSUPP)
00142                 wiphy_err(key->local->hw.wiphy,
00143                           "failed to set key (%d, %pM) to hardware (%d)\n",
00144                           key->conf.keyidx,
00145                           sta ? sta->sta.addr : bcast_addr, ret);
00146 
00147  out_unsupported:
00148         switch (key->conf.cipher) {
00149         case WLAN_CIPHER_SUITE_WEP40:
00150         case WLAN_CIPHER_SUITE_WEP104:
00151         case WLAN_CIPHER_SUITE_TKIP:
00152         case WLAN_CIPHER_SUITE_CCMP:
00153         case WLAN_CIPHER_SUITE_AES_CMAC:
00154                 /* all of these we can do in software */
00155                 return 0;
00156         default:
00157                 return -EINVAL;
00158         }
00159 }
00160 
00161 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
00162 {
00163         struct ieee80211_sub_if_data *sdata;
00164         struct sta_info *sta;
00165         int ret;
00166 
00167         might_sleep();
00168 
00169         if (!key || !key->local->ops->set_key)
00170                 return;
00171 
00172         assert_key_lock(key->local);
00173 
00174         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
00175                 return;
00176 
00177         sta = key->sta;
00178         sdata = key->sdata;
00179 
00180         if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
00181               (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
00182               (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
00183                 increment_tailroom_need_count(sdata);
00184 
00185         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
00186                           sta ? &sta->sta : NULL, &key->conf);
00187 
00188         if (ret)
00189                 wiphy_err(key->local->hw.wiphy,
00190                           "failed to remove key (%d, %pM) from hardware (%d)\n",
00191                           key->conf.keyidx,
00192                           sta ? sta->sta.addr : bcast_addr, ret);
00193 
00194         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
00195 }
00196 
00197 void ieee80211_key_removed(struct ieee80211_key_conf *key_conf)
00198 {
00199         struct ieee80211_key *key;
00200 
00201         key = container_of(key_conf, struct ieee80211_key, conf);
00202 
00203         might_sleep();
00204         assert_key_lock(key->local);
00205 
00206         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
00207 
00208         /*
00209          * Flush TX path to avoid attempts to use this key
00210          * after this function returns. Until then, drivers
00211          * must be prepared to handle the key.
00212          */
00213         synchronize_rcu();
00214 }
00215 EXPORT_SYMBOL_GPL(ieee80211_key_removed);
00216 
00217 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
00218                                         int idx, bool uni, bool multi)
00219 {
00220         struct ieee80211_key *key = NULL;
00221 
00222         assert_key_lock(sdata->local);
00223 
00224         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
00225                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
00226 
00227         if (uni)
00228                 rcu_assign_pointer(sdata->default_unicast_key, key);
00229         if (multi)
00230                 rcu_assign_pointer(sdata->default_multicast_key, key);
00231 
00232         ieee80211_debugfs_key_update_default(sdata);
00233 }
00234 
00235 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
00236                                bool uni, bool multi)
00237 {
00238         mutex_lock(&sdata->local->key_mtx);
00239         __ieee80211_set_default_key(sdata, idx, uni, multi);
00240         mutex_unlock(&sdata->local->key_mtx);
00241 }
00242 
00243 static void
00244 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
00245 {
00246         struct ieee80211_key *key = NULL;
00247 
00248         assert_key_lock(sdata->local);
00249 
00250         if (idx >= NUM_DEFAULT_KEYS &&
00251             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
00252                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
00253 
00254         rcu_assign_pointer(sdata->default_mgmt_key, key);
00255 
00256         ieee80211_debugfs_key_update_default(sdata);
00257 }
00258 
00259 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
00260                                     int idx)
00261 {
00262         mutex_lock(&sdata->local->key_mtx);
00263         __ieee80211_set_default_mgmt_key(sdata, idx);
00264         mutex_unlock(&sdata->local->key_mtx);
00265 }
00266 
00267 
00268 static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
00269                                     struct sta_info *sta,
00270                                     bool pairwise,
00271                                     struct ieee80211_key *old,
00272                                     struct ieee80211_key *new)
00273 {
00274         int idx;
00275         bool defunikey, defmultikey, defmgmtkey;
00276 
00277         if (new)
00278                 list_add_tail(&new->list, &sdata->key_list);
00279 
00280         if (sta && pairwise) {
00281                 rcu_assign_pointer(sta->ptk, new);
00282         } else if (sta) {
00283                 if (old)
00284                         idx = old->conf.keyidx;
00285                 else
00286                         idx = new->conf.keyidx;
00287                 rcu_assign_pointer(sta->gtk[idx], new);
00288         } else {
00289                 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
00290 
00291                 if (old)
00292                         idx = old->conf.keyidx;
00293                 else
00294                         idx = new->conf.keyidx;
00295 
00296                 defunikey = old &&
00297                         old == key_mtx_dereference(sdata->local,
00298                                                 sdata->default_unicast_key);
00299                 defmultikey = old &&
00300                         old == key_mtx_dereference(sdata->local,
00301                                                 sdata->default_multicast_key);
00302                 defmgmtkey = old &&
00303                         old == key_mtx_dereference(sdata->local,
00304                                                 sdata->default_mgmt_key);
00305 
00306                 if (defunikey && !new)
00307                         __ieee80211_set_default_key(sdata, -1, true, false);
00308                 if (defmultikey && !new)
00309                         __ieee80211_set_default_key(sdata, -1, false, true);
00310                 if (defmgmtkey && !new)
00311                         __ieee80211_set_default_mgmt_key(sdata, -1);
00312 
00313                 rcu_assign_pointer(sdata->keys[idx], new);
00314                 if (defunikey && new)
00315                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
00316                                                     true, false);
00317                 if (defmultikey && new)
00318                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
00319                                                     false, true);
00320                 if (defmgmtkey && new)
00321                         __ieee80211_set_default_mgmt_key(sdata,
00322                                                          new->conf.keyidx);
00323         }
00324 
00325         if (old)
00326                 list_del(&old->list);
00327 }
00328 
00329 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
00330                                           const u8 *key_data,
00331                                           size_t seq_len, const u8 *seq)
00332 {
00333         struct ieee80211_key *key;
00334         int i, j, err;
00335 
00336         BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS);
00337 
00338         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
00339         if (!key)
00340                 return ERR_PTR(-ENOMEM);
00341 
00342         /*
00343          * Default to software encryption; we'll later upload the
00344          * key to the hardware if possible.
00345          */
00346         key->conf.flags = 0;
00347         key->flags = 0;
00348 
00349         key->conf.cipher = cipher;
00350         key->conf.keyidx = idx;
00351         key->conf.keylen = key_len;
00352         switch (cipher) {
00353         case WLAN_CIPHER_SUITE_WEP40:
00354         case WLAN_CIPHER_SUITE_WEP104:
00355                 key->conf.iv_len = WEP_IV_LEN;
00356                 key->conf.icv_len = WEP_ICV_LEN;
00357                 break;
00358         case WLAN_CIPHER_SUITE_TKIP:
00359                 key->conf.iv_len = TKIP_IV_LEN;
00360                 key->conf.icv_len = TKIP_ICV_LEN;
00361                 if (seq) {
00362                         for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
00363                                 key->u.tkip.rx[i].iv32 =
00364                                         get_unaligned_le32(&seq[2]);
00365                                 key->u.tkip.rx[i].iv16 =
00366                                         get_unaligned_le16(seq);
00367                         }
00368                 }
00369                 spin_lock_init(&key->u.tkip.txlock);
00370                 break;
00371         case WLAN_CIPHER_SUITE_CCMP:
00372                 key->conf.iv_len = CCMP_HDR_LEN;
00373                 key->conf.icv_len = CCMP_MIC_LEN;
00374                 if (seq) {
00375                         for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++)
00376                                 for (j = 0; j < CCMP_PN_LEN; j++)
00377                                         key->u.ccmp.rx_pn[i][j] =
00378                                                 seq[CCMP_PN_LEN - j - 1];
00379                 }
00380                 /*
00381                  * Initialize AES key state here as an optimization so that
00382                  * it does not need to be initialized for every packet.
00383                  */
00384                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data);
00385                 if (IS_ERR(key->u.ccmp.tfm)) {
00386                         err = PTR_ERR(key->u.ccmp.tfm);
00387                         kfree(key);
00388                         return ERR_PTR(err);
00389                 }
00390                 break;
00391         case WLAN_CIPHER_SUITE_AES_CMAC:
00392                 key->conf.iv_len = 0;
00393                 key->conf.icv_len = sizeof(struct ieee80211_mmie);
00394                 if (seq)
00395                         for (j = 0; j < 6; j++)
00396                                 key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1];
00397                 /*
00398                  * Initialize AES key state here as an optimization so that
00399                  * it does not need to be initialized for every packet.
00400                  */
00401                 key->u.aes_cmac.tfm =
00402                         ieee80211_aes_cmac_key_setup(key_data);
00403                 if (IS_ERR(key->u.aes_cmac.tfm)) {
00404                         err = PTR_ERR(key->u.aes_cmac.tfm);
00405                         kfree(key);
00406                         return ERR_PTR(err);
00407                 }
00408                 break;
00409         }
00410         memcpy(key->conf.key, key_data, key_len);
00411         INIT_LIST_HEAD(&key->list);
00412 
00413         return key;
00414 }
00415 
00416 static void __ieee80211_key_destroy(struct ieee80211_key *key)
00417 {
00418         if (!key)
00419                 return;
00420 
00421         /*
00422          * Synchronize so the TX path can no longer be using
00423          * this key before we free/remove it.
00424          */
00425         synchronize_rcu();
00426 
00427         if (key->local)
00428                 ieee80211_key_disable_hw_accel(key);
00429 
00430         if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
00431                 ieee80211_aes_key_free(key->u.ccmp.tfm);
00432         if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
00433                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
00434         if (key->local) {
00435                 ieee80211_debugfs_key_remove(key);
00436                 key->sdata->crypto_tx_tailroom_needed_cnt--;
00437         }
00438 
00439         kfree(key);
00440 }
00441 
00442 int ieee80211_key_link(struct ieee80211_key *key,
00443                        struct ieee80211_sub_if_data *sdata,
00444                        struct sta_info *sta)
00445 {
00446         struct ieee80211_key *old_key;
00447         int idx, ret;
00448         bool pairwise;
00449 
00450         BUG_ON(!sdata);
00451         BUG_ON(!key);
00452 
00453         pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
00454         idx = key->conf.keyidx;
00455         key->local = sdata->local;
00456         key->sdata = sdata;
00457         key->sta = sta;
00458 
00459         if (sta) {
00460                 /*
00461                  * some hardware cannot handle TKIP with QoS, so
00462                  * we indicate whether QoS could be in use.
00463                  */
00464                 if (test_sta_flag(sta, WLAN_STA_WME))
00465                         key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
00466         } else {
00467                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
00468                         struct sta_info *ap;
00469 
00470                         /*
00471                          * We're getting a sta pointer in, so must be under
00472                          * appropriate locking for sta_info_get().
00473                          */
00474 
00475                         /* same here, the AP could be using QoS */
00476                         ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid);
00477                         if (ap) {
00478                                 if (test_sta_flag(ap, WLAN_STA_WME))
00479                                         key->conf.flags |=
00480                                                 IEEE80211_KEY_FLAG_WMM_STA;
00481                         }
00482                 }
00483         }
00484 
00485         mutex_lock(&sdata->local->key_mtx);
00486 
00487         if (sta && pairwise)
00488                 old_key = key_mtx_dereference(sdata->local, sta->ptk);
00489         else if (sta)
00490                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
00491         else
00492                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
00493 
00494         increment_tailroom_need_count(sdata);
00495 
00496         __ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
00497         __ieee80211_key_destroy(old_key);
00498 
00499         ieee80211_debugfs_key_add(key);
00500 
00501         ret = ieee80211_key_enable_hw_accel(key);
00502 
00503         mutex_unlock(&sdata->local->key_mtx);
00504 
00505         return ret;
00506 }
00507 
00508 void __ieee80211_key_free(struct ieee80211_key *key)
00509 {
00510         if (!key)
00511                 return;
00512 
00513         /*
00514          * Replace key with nothingness if it was ever used.
00515          */
00516         if (key->sdata)
00517                 __ieee80211_key_replace(key->sdata, key->sta,
00518                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
00519                                 key, NULL);
00520         __ieee80211_key_destroy(key);
00521 }
00522 
00523 void ieee80211_key_free(struct ieee80211_local *local,
00524                         struct ieee80211_key *key)
00525 {
00526         mutex_lock(&local->key_mtx);
00527         __ieee80211_key_free(key);
00528         mutex_unlock(&local->key_mtx);
00529 }
00530 
00531 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
00532 {
00533         struct ieee80211_key *key;
00534 
00535         ASSERT_RTNL();
00536 
00537         if (WARN_ON(!ieee80211_sdata_running(sdata)))
00538                 return;
00539 
00540         mutex_lock(&sdata->local->key_mtx);
00541 
00542         sdata->crypto_tx_tailroom_needed_cnt = 0;
00543 
00544         list_for_each_entry(key, &sdata->key_list, list) {
00545                 increment_tailroom_need_count(sdata);
00546                 ieee80211_key_enable_hw_accel(key);
00547         }
00548 
00549         mutex_unlock(&sdata->local->key_mtx);
00550 }
00551 
00552 void ieee80211_iter_keys(struct ieee80211_hw *hw,
00553                          struct ieee80211_vif *vif,
00554                          void (*iter)(struct ieee80211_hw *hw,
00555                                       struct ieee80211_vif *vif,
00556                                       struct ieee80211_sta *sta,
00557                                       struct ieee80211_key_conf *key,
00558                                       void *data),
00559                          void *iter_data)
00560 {
00561         struct ieee80211_local *local = hw_to_local(hw);
00562         struct ieee80211_key *key;
00563         struct ieee80211_sub_if_data *sdata;
00564 
00565         ASSERT_RTNL();
00566 
00567         mutex_lock(&local->key_mtx);
00568         if (vif) {
00569                 sdata = vif_to_sdata(vif);
00570                 list_for_each_entry(key, &sdata->key_list, list)
00571                         iter(hw, &sdata->vif,
00572                              key->sta ? &key->sta->sta : NULL,
00573                              &key->conf, iter_data);
00574         } else {
00575                 list_for_each_entry(sdata, &local->interfaces, list)
00576                         list_for_each_entry(key, &sdata->key_list, list)
00577                                 iter(hw, &sdata->vif,
00578                                      key->sta ? &key->sta->sta : NULL,
00579                                      &key->conf, iter_data);
00580         }
00581         mutex_unlock(&local->key_mtx);
00582 }
00583 EXPORT_SYMBOL(ieee80211_iter_keys);
00584 
00585 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
00586 {
00587         struct ieee80211_key *key;
00588 
00589         ASSERT_RTNL();
00590 
00591         mutex_lock(&sdata->local->key_mtx);
00592 
00593         list_for_each_entry(key, &sdata->key_list, list)
00594                 ieee80211_key_disable_hw_accel(key);
00595 
00596         mutex_unlock(&sdata->local->key_mtx);
00597 }
00598 
00599 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
00600 {
00601         struct ieee80211_key *key, *tmp;
00602 
00603         mutex_lock(&sdata->local->key_mtx);
00604 
00605         ieee80211_debugfs_key_remove_mgmt_default(sdata);
00606 
00607         list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
00608                 __ieee80211_key_free(key);
00609 
00610         ieee80211_debugfs_key_update_default(sdata);
00611 
00612         mutex_unlock(&sdata->local->key_mtx);
00613 }
00614 
00615 
00616 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
00617                                 const u8 *replay_ctr, gfp_t gfp)
00618 {
00619         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
00620 
00621         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
00622 
00623         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
00624 }
00625 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
00626 
00627 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
00628                               struct ieee80211_key_seq *seq)
00629 {
00630         struct ieee80211_key *key;
00631         u64 pn64;
00632 
00633         if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
00634                 return;
00635 
00636         key = container_of(keyconf, struct ieee80211_key, conf);
00637 
00638         switch (key->conf.cipher) {
00639         case WLAN_CIPHER_SUITE_TKIP:
00640                 seq->tkip.iv32 = key->u.tkip.tx.iv32;
00641                 seq->tkip.iv16 = key->u.tkip.tx.iv16;
00642                 break;
00643         case WLAN_CIPHER_SUITE_CCMP:
00644                 pn64 = atomic64_read(&key->u.ccmp.tx_pn);
00645                 seq->ccmp.pn[5] = pn64;
00646                 seq->ccmp.pn[4] = pn64 >> 8;
00647                 seq->ccmp.pn[3] = pn64 >> 16;
00648                 seq->ccmp.pn[2] = pn64 >> 24;
00649                 seq->ccmp.pn[1] = pn64 >> 32;
00650                 seq->ccmp.pn[0] = pn64 >> 40;
00651                 break;
00652         case WLAN_CIPHER_SUITE_AES_CMAC:
00653                 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
00654                 seq->ccmp.pn[5] = pn64;
00655                 seq->ccmp.pn[4] = pn64 >> 8;
00656                 seq->ccmp.pn[3] = pn64 >> 16;
00657                 seq->ccmp.pn[2] = pn64 >> 24;
00658                 seq->ccmp.pn[1] = pn64 >> 32;
00659                 seq->ccmp.pn[0] = pn64 >> 40;
00660                 break;
00661         default:
00662                 WARN_ON(1);
00663         }
00664 }
00665 EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
00666 
00667 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
00668                               int tid, struct ieee80211_key_seq *seq)
00669 {
00670         struct ieee80211_key *key;
00671         const u8 *pn;
00672 
00673         key = container_of(keyconf, struct ieee80211_key, conf);
00674 
00675         switch (key->conf.cipher) {
00676         case WLAN_CIPHER_SUITE_TKIP:
00677                 if (WARN_ON(tid < 0 || tid >= NUM_RX_DATA_QUEUES))
00678                         return;
00679                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
00680                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
00681                 break;
00682         case WLAN_CIPHER_SUITE_CCMP:
00683                 if (WARN_ON(tid < -1 || tid >= NUM_RX_DATA_QUEUES))
00684                         return;
00685                 if (tid < 0)
00686                         pn = key->u.ccmp.rx_pn[NUM_RX_DATA_QUEUES];
00687                 else
00688                         pn = key->u.ccmp.rx_pn[tid];
00689                 memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN);
00690                 break;
00691         case WLAN_CIPHER_SUITE_AES_CMAC:
00692                 if (WARN_ON(tid != 0))
00693                         return;
00694                 pn = key->u.aes_cmac.rx_pn;
00695                 memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN);
00696                 break;
00697         }
00698 }
00699 EXPORT_SYMBOL(ieee80211_get_key_rx_seq);


ros_rt_wmp
Author(s): Danilo Tardioli, dantard@unizar.es
autogenerated on Fri Jan 3 2014 12:07:55