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 "ieee80211_i.h"
00021 #include "driver-ops.h"
00022 #include "debugfs_key.h"
00023 #include "aes_ccm.h"
00024 #include "aes_cmac.h"
00025 
00026 
00050 static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
00051 
00052 static void assert_key_lock(struct ieee80211_local *local)
00053 {
00054         lockdep_assert_held(&local->key_mtx);
00055 }
00056 
00057 static struct ieee80211_sta *get_sta_for_key(struct ieee80211_key *key)
00058 {
00059         if (key->sta)
00060                 return &key->sta->sta;
00061 
00062         return NULL;
00063 }
00064 
00065 static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
00066 {
00067         /*
00068          * When this count is zero, SKB resizing for allocating tailroom
00069          * for IV or MMIC is skipped. But, this check has created two race
00070          * cases in xmit path while transiting from zero count to one:
00071          *
00072          * 1. SKB resize was skipped because no key was added but just before
00073          * the xmit key is added and SW encryption kicks off.
00074          *
00075          * 2. SKB resize was skipped because all the keys were hw planted but
00076          * just before xmit one of the key is deleted and SW encryption kicks
00077          * off.
00078          *
00079          * In both the above case SW encryption will find not enough space for
00080          * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
00081          *
00082          * Solution has been explained at
00083          * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
00084          */
00085 
00086         if (!sdata->crypto_tx_tailroom_needed_cnt++) {
00087                 /*
00088                  * Flush all XMIT packets currently using HW encryption or no
00089                  * encryption at all if the count transition is from 0 -> 1.
00090                  */
00091                 synchronize_net();
00092         }
00093 }
00094 
00095 static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
00096 {
00097         struct ieee80211_sub_if_data *sdata;
00098         struct ieee80211_sta *sta;
00099         int ret;
00100 
00101         might_sleep();
00102 
00103         if (!key->local->ops->set_key)
00104                 goto out_unsupported;
00105 
00106         assert_key_lock(key->local);
00107 
00108         sta = get_sta_for_key(key);
00109 
00110         /*
00111          * If this is a per-STA GTK, check if it
00112          * is supported; if not, return.
00113          */
00114         if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
00115             !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK))
00116                 goto out_unsupported;
00117 
00118         sdata = key->sdata;
00119         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
00120                 /*
00121                  * The driver doesn't know anything about VLAN interfaces.
00122                  * Hence, don't send GTKs for VLAN interfaces to the driver.
00123                  */
00124                 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
00125                         goto out_unsupported;
00126                 sdata = container_of(sdata->bss,
00127                                      struct ieee80211_sub_if_data,
00128                                      u.ap);
00129         }
00130 
00131         ret = drv_set_key(key->local, SET_KEY, sdata, sta, &key->conf);
00132 
00133         if (!ret) {
00134                 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
00135 
00136                 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
00137                       (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
00138                         sdata->crypto_tx_tailroom_needed_cnt--;
00139 
00140                 return 0;
00141         }
00142 
00143         if (ret != -ENOSPC && ret != -EOPNOTSUPP)
00144                 wiphy_err(key->local->hw.wiphy,
00145                           "failed to set key (%d, %pM) to hardware (%d)\n",
00146                           key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
00147 
00148  out_unsupported:
00149         switch (key->conf.cipher) {
00150         case WLAN_CIPHER_SUITE_WEP40:
00151         case WLAN_CIPHER_SUITE_WEP104:
00152         case WLAN_CIPHER_SUITE_TKIP:
00153         case WLAN_CIPHER_SUITE_CCMP:
00154         case WLAN_CIPHER_SUITE_AES_CMAC:
00155                 /* all of these we can do in software */
00156                 return 0;
00157         default:
00158                 return -EINVAL;
00159         }
00160 }
00161 
00162 static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
00163 {
00164         struct ieee80211_sub_if_data *sdata;
00165         struct ieee80211_sta *sta;
00166         int ret;
00167 
00168         might_sleep();
00169 
00170         if (!key || !key->local->ops->set_key)
00171                 return;
00172 
00173         assert_key_lock(key->local);
00174 
00175         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
00176                 return;
00177 
00178         sta = get_sta_for_key(key);
00179         sdata = key->sdata;
00180 
00181         if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
00182               (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
00183                 increment_tailroom_need_count(sdata);
00184 
00185         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
00186                 sdata = container_of(sdata->bss,
00187                                      struct ieee80211_sub_if_data,
00188                                      u.ap);
00189 
00190         ret = drv_set_key(key->local, DISABLE_KEY, sdata,
00191                           sta, &key->conf);
00192 
00193         if (ret)
00194                 wiphy_err(key->local->hw.wiphy,
00195                           "failed to remove key (%d, %pM) from hardware (%d)\n",
00196                           key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
00197 
00198         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
00199 }
00200 
00201 void ieee80211_key_removed(struct ieee80211_key_conf *key_conf)
00202 {
00203         struct ieee80211_key *key;
00204 
00205         key = container_of(key_conf, struct ieee80211_key, conf);
00206 
00207         might_sleep();
00208         assert_key_lock(key->local);
00209 
00210         key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
00211 
00212         /*
00213          * Flush TX path to avoid attempts to use this key
00214          * after this function returns. Until then, drivers
00215          * must be prepared to handle the key.
00216          */
00217         synchronize_rcu();
00218 }
00219 EXPORT_SYMBOL_GPL(ieee80211_key_removed);
00220 
00221 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
00222                                         int idx, bool uni, bool multi)
00223 {
00224         struct ieee80211_key *key = NULL;
00225 
00226         assert_key_lock(sdata->local);
00227 
00228         if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
00229                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
00230 
00231         if (uni)
00232                 rcu_assign_pointer(sdata->default_unicast_key, key);
00233         if (multi)
00234                 rcu_assign_pointer(sdata->default_multicast_key, key);
00235 
00236         ieee80211_debugfs_key_update_default(sdata);
00237 }
00238 
00239 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
00240                                bool uni, bool multi)
00241 {
00242         mutex_lock(&sdata->local->key_mtx);
00243         __ieee80211_set_default_key(sdata, idx, uni, multi);
00244         mutex_unlock(&sdata->local->key_mtx);
00245 }
00246 
00247 static void
00248 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
00249 {
00250         struct ieee80211_key *key = NULL;
00251 
00252         assert_key_lock(sdata->local);
00253 
00254         if (idx >= NUM_DEFAULT_KEYS &&
00255             idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
00256                 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
00257 
00258         rcu_assign_pointer(sdata->default_mgmt_key, key);
00259 
00260         ieee80211_debugfs_key_update_default(sdata);
00261 }
00262 
00263 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
00264                                     int idx)
00265 {
00266         mutex_lock(&sdata->local->key_mtx);
00267         __ieee80211_set_default_mgmt_key(sdata, idx);
00268         mutex_unlock(&sdata->local->key_mtx);
00269 }
00270 
00271 
00272 static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
00273                                     struct sta_info *sta,
00274                                     bool pairwise,
00275                                     struct ieee80211_key *old,
00276                                     struct ieee80211_key *new)
00277 {
00278         int idx;
00279         bool defunikey, defmultikey, defmgmtkey;
00280 
00281         if (new)
00282                 list_add_tail(&new->list, &sdata->key_list);
00283 
00284         if (sta && pairwise) {
00285                 rcu_assign_pointer(sta->ptk, new);
00286         } else if (sta) {
00287                 if (old)
00288                         idx = old->conf.keyidx;
00289                 else
00290                         idx = new->conf.keyidx;
00291                 rcu_assign_pointer(sta->gtk[idx], new);
00292         } else {
00293                 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
00294 
00295                 if (old)
00296                         idx = old->conf.keyidx;
00297                 else
00298                         idx = new->conf.keyidx;
00299 
00300                 defunikey = old &&
00301                         old == key_mtx_dereference(sdata->local,
00302                                                 sdata->default_unicast_key);
00303                 defmultikey = old &&
00304                         old == key_mtx_dereference(sdata->local,
00305                                                 sdata->default_multicast_key);
00306                 defmgmtkey = old &&
00307                         old == key_mtx_dereference(sdata->local,
00308                                                 sdata->default_mgmt_key);
00309 
00310                 if (defunikey && !new)
00311                         __ieee80211_set_default_key(sdata, -1, true, false);
00312                 if (defmultikey && !new)
00313                         __ieee80211_set_default_key(sdata, -1, false, true);
00314                 if (defmgmtkey && !new)
00315                         __ieee80211_set_default_mgmt_key(sdata, -1);
00316 
00317                 rcu_assign_pointer(sdata->keys[idx], new);
00318                 if (defunikey && new)
00319                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
00320                                                     true, false);
00321                 if (defmultikey && new)
00322                         __ieee80211_set_default_key(sdata, new->conf.keyidx,
00323                                                     false, true);
00324                 if (defmgmtkey && new)
00325                         __ieee80211_set_default_mgmt_key(sdata,
00326                                                          new->conf.keyidx);
00327         }
00328 
00329         if (old)
00330                 list_del(&old->list);
00331 }
00332 
00333 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
00334                                           const u8 *key_data,
00335                                           size_t seq_len, const u8 *seq)
00336 {
00337         struct ieee80211_key *key;
00338         int i, j, err;
00339 
00340         BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS);
00341 
00342         key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
00343         if (!key)
00344                 return ERR_PTR(-ENOMEM);
00345 
00346         /*
00347          * Default to software encryption; we'll later upload the
00348          * key to the hardware if possible.
00349          */
00350         key->conf.flags = 0;
00351         key->flags = 0;
00352 
00353         key->conf.cipher = cipher;
00354         key->conf.keyidx = idx;
00355         key->conf.keylen = key_len;
00356         switch (cipher) {
00357         case WLAN_CIPHER_SUITE_WEP40:
00358         case WLAN_CIPHER_SUITE_WEP104:
00359                 key->conf.iv_len = WEP_IV_LEN;
00360                 key->conf.icv_len = WEP_ICV_LEN;
00361                 break;
00362         case WLAN_CIPHER_SUITE_TKIP:
00363                 key->conf.iv_len = TKIP_IV_LEN;
00364                 key->conf.icv_len = TKIP_ICV_LEN;
00365                 if (seq) {
00366                         for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
00367                                 key->u.tkip.rx[i].iv32 =
00368                                         get_unaligned_le32(&seq[2]);
00369                                 key->u.tkip.rx[i].iv16 =
00370                                         get_unaligned_le16(seq);
00371                         }
00372                 }
00373                 spin_lock_init(&key->u.tkip.txlock);
00374                 break;
00375         case WLAN_CIPHER_SUITE_CCMP:
00376                 key->conf.iv_len = CCMP_HDR_LEN;
00377                 key->conf.icv_len = CCMP_MIC_LEN;
00378                 if (seq) {
00379                         for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++)
00380                                 for (j = 0; j < CCMP_PN_LEN; j++)
00381                                         key->u.ccmp.rx_pn[i][j] =
00382                                                 seq[CCMP_PN_LEN - j - 1];
00383                 }
00384                 /*
00385                  * Initialize AES key state here as an optimization so that
00386                  * it does not need to be initialized for every packet.
00387                  */
00388                 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data);
00389                 if (IS_ERR(key->u.ccmp.tfm)) {
00390                         err = PTR_ERR(key->u.ccmp.tfm);
00391                         kfree(key);
00392                         return ERR_PTR(err);
00393                 }
00394                 break;
00395         case WLAN_CIPHER_SUITE_AES_CMAC:
00396                 key->conf.iv_len = 0;
00397                 key->conf.icv_len = sizeof(struct ieee80211_mmie);
00398                 if (seq)
00399                         for (j = 0; j < 6; j++)
00400                                 key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1];
00401                 /*
00402                  * Initialize AES key state here as an optimization so that
00403                  * it does not need to be initialized for every packet.
00404                  */
00405                 key->u.aes_cmac.tfm =
00406                         ieee80211_aes_cmac_key_setup(key_data);
00407                 if (IS_ERR(key->u.aes_cmac.tfm)) {
00408                         err = PTR_ERR(key->u.aes_cmac.tfm);
00409                         kfree(key);
00410                         return ERR_PTR(err);
00411                 }
00412                 break;
00413         }
00414         memcpy(key->conf.key, key_data, key_len);
00415         INIT_LIST_HEAD(&key->list);
00416 
00417         return key;
00418 }
00419 
00420 static void __ieee80211_key_destroy(struct ieee80211_key *key)
00421 {
00422         if (!key)
00423                 return;
00424 
00425         /*
00426          * Synchronize so the TX path can no longer be using
00427          * this key before we free/remove it.
00428          */
00429         synchronize_rcu();
00430 
00431         if (key->local)
00432                 ieee80211_key_disable_hw_accel(key);
00433 
00434         if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
00435                 ieee80211_aes_key_free(key->u.ccmp.tfm);
00436         if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
00437                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
00438         if (key->local) {
00439                 ieee80211_debugfs_key_remove(key);
00440                 key->sdata->crypto_tx_tailroom_needed_cnt--;
00441         }
00442 
00443         kfree(key);
00444 }
00445 
00446 int ieee80211_key_link(struct ieee80211_key *key,
00447                        struct ieee80211_sub_if_data *sdata,
00448                        struct sta_info *sta)
00449 {
00450         struct ieee80211_key *old_key;
00451         int idx, ret;
00452         bool pairwise;
00453 
00454         BUG_ON(!sdata);
00455         BUG_ON(!key);
00456 
00457         pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
00458         idx = key->conf.keyidx;
00459         key->local = sdata->local;
00460         key->sdata = sdata;
00461         key->sta = sta;
00462 
00463         if (sta) {
00464                 /*
00465                  * some hardware cannot handle TKIP with QoS, so
00466                  * we indicate whether QoS could be in use.
00467                  */
00468                 if (test_sta_flag(sta, WLAN_STA_WME))
00469                         key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
00470         } else {
00471                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
00472                         struct sta_info *ap;
00473 
00474                         /*
00475                          * We're getting a sta pointer in, so must be under
00476                          * appropriate locking for sta_info_get().
00477                          */
00478 
00479                         /* same here, the AP could be using QoS */
00480                         ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid);
00481                         if (ap) {
00482                                 if (test_sta_flag(ap, WLAN_STA_WME))
00483                                         key->conf.flags |=
00484                                                 IEEE80211_KEY_FLAG_WMM_STA;
00485                         }
00486                 }
00487         }
00488 
00489         mutex_lock(&sdata->local->key_mtx);
00490 
00491         if (sta && pairwise)
00492                 old_key = key_mtx_dereference(sdata->local, sta->ptk);
00493         else if (sta)
00494                 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
00495         else
00496                 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
00497 
00498         increment_tailroom_need_count(sdata);
00499 
00500         __ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
00501         __ieee80211_key_destroy(old_key);
00502 
00503         ieee80211_debugfs_key_add(key);
00504 
00505         ret = ieee80211_key_enable_hw_accel(key);
00506 
00507         mutex_unlock(&sdata->local->key_mtx);
00508 
00509         return ret;
00510 }
00511 
00512 void __ieee80211_key_free(struct ieee80211_key *key)
00513 {
00514         if (!key)
00515                 return;
00516 
00517         /*
00518          * Replace key with nothingness if it was ever used.
00519          */
00520         if (key->sdata)
00521                 __ieee80211_key_replace(key->sdata, key->sta,
00522                                 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
00523                                 key, NULL);
00524         __ieee80211_key_destroy(key);
00525 }
00526 
00527 void ieee80211_key_free(struct ieee80211_local *local,
00528                         struct ieee80211_key *key)
00529 {
00530         mutex_lock(&local->key_mtx);
00531         __ieee80211_key_free(key);
00532         mutex_unlock(&local->key_mtx);
00533 }
00534 
00535 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
00536 {
00537         struct ieee80211_key *key;
00538 
00539         ASSERT_RTNL();
00540 
00541         if (WARN_ON(!ieee80211_sdata_running(sdata)))
00542                 return;
00543 
00544         mutex_lock(&sdata->local->key_mtx);
00545 
00546         sdata->crypto_tx_tailroom_needed_cnt = 0;
00547 
00548         list_for_each_entry(key, &sdata->key_list, list) {
00549                 increment_tailroom_need_count(sdata);
00550                 ieee80211_key_enable_hw_accel(key);
00551         }
00552 
00553         mutex_unlock(&sdata->local->key_mtx);
00554 }
00555 
00556 void ieee80211_iter_keys(struct ieee80211_hw *hw,
00557                          struct ieee80211_vif *vif,
00558                          void (*iter)(struct ieee80211_hw *hw,
00559                                       struct ieee80211_vif *vif,
00560                                       struct ieee80211_sta *sta,
00561                                       struct ieee80211_key_conf *key,
00562                                       void *data),
00563                          void *iter_data)
00564 {
00565         struct ieee80211_local *local = hw_to_local(hw);
00566         struct ieee80211_key *key;
00567         struct ieee80211_sub_if_data *sdata;
00568 
00569         ASSERT_RTNL();
00570 
00571         mutex_lock(&local->key_mtx);
00572         if (vif) {
00573                 sdata = vif_to_sdata(vif);
00574                 list_for_each_entry(key, &sdata->key_list, list)
00575                         iter(hw, &sdata->vif,
00576                              key->sta ? &key->sta->sta : NULL,
00577                              &key->conf, iter_data);
00578         } else {
00579                 list_for_each_entry(sdata, &local->interfaces, list)
00580                         list_for_each_entry(key, &sdata->key_list, list)
00581                                 iter(hw, &sdata->vif,
00582                                      key->sta ? &key->sta->sta : NULL,
00583                                      &key->conf, iter_data);
00584         }
00585         mutex_unlock(&local->key_mtx);
00586 }
00587 EXPORT_SYMBOL(ieee80211_iter_keys);
00588 
00589 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
00590 {
00591         struct ieee80211_key *key;
00592 
00593         ASSERT_RTNL();
00594 
00595         mutex_lock(&sdata->local->key_mtx);
00596 
00597         list_for_each_entry(key, &sdata->key_list, list)
00598                 ieee80211_key_disable_hw_accel(key);
00599 
00600         mutex_unlock(&sdata->local->key_mtx);
00601 }
00602 
00603 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
00604 {
00605         struct ieee80211_key *key, *tmp;
00606 
00607         mutex_lock(&sdata->local->key_mtx);
00608 
00609         ieee80211_debugfs_key_remove_mgmt_default(sdata);
00610 
00611         list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
00612                 __ieee80211_key_free(key);
00613 
00614         ieee80211_debugfs_key_update_default(sdata);
00615 
00616         mutex_unlock(&sdata->local->key_mtx);
00617 }
00618 
00619 
00620 void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
00621                                 const u8 *replay_ctr, gfp_t gfp)
00622 {
00623         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
00624 
00625         trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
00626 
00627         cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
00628 }
00629 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
00630 
00631 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
00632                               struct ieee80211_key_seq *seq)
00633 {
00634         struct ieee80211_key *key;
00635         u64 pn64;
00636 
00637         if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
00638                 return;
00639 
00640         key = container_of(keyconf, struct ieee80211_key, conf);
00641 
00642         switch (key->conf.cipher) {
00643         case WLAN_CIPHER_SUITE_TKIP:
00644                 seq->tkip.iv32 = key->u.tkip.tx.iv32;
00645                 seq->tkip.iv16 = key->u.tkip.tx.iv16;
00646                 break;
00647         case WLAN_CIPHER_SUITE_CCMP:
00648                 pn64 = atomic64_read(&key->u.ccmp.tx_pn);
00649                 seq->ccmp.pn[5] = pn64;
00650                 seq->ccmp.pn[4] = pn64 >> 8;
00651                 seq->ccmp.pn[3] = pn64 >> 16;
00652                 seq->ccmp.pn[2] = pn64 >> 24;
00653                 seq->ccmp.pn[1] = pn64 >> 32;
00654                 seq->ccmp.pn[0] = pn64 >> 40;
00655                 break;
00656         case WLAN_CIPHER_SUITE_AES_CMAC:
00657                 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
00658                 seq->ccmp.pn[5] = pn64;
00659                 seq->ccmp.pn[4] = pn64 >> 8;
00660                 seq->ccmp.pn[3] = pn64 >> 16;
00661                 seq->ccmp.pn[2] = pn64 >> 24;
00662                 seq->ccmp.pn[1] = pn64 >> 32;
00663                 seq->ccmp.pn[0] = pn64 >> 40;
00664                 break;
00665         default:
00666                 WARN_ON(1);
00667         }
00668 }
00669 EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
00670 
00671 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
00672                               int tid, struct ieee80211_key_seq *seq)
00673 {
00674         struct ieee80211_key *key;
00675         const u8 *pn;
00676 
00677         key = container_of(keyconf, struct ieee80211_key, conf);
00678 
00679         switch (key->conf.cipher) {
00680         case WLAN_CIPHER_SUITE_TKIP:
00681                 if (WARN_ON(tid < 0 || tid >= NUM_RX_DATA_QUEUES))
00682                         return;
00683                 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
00684                 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
00685                 break;
00686         case WLAN_CIPHER_SUITE_CCMP:
00687                 if (WARN_ON(tid < -1 || tid >= NUM_RX_DATA_QUEUES))
00688                         return;
00689                 if (tid < 0)
00690                         pn = key->u.ccmp.rx_pn[NUM_RX_DATA_QUEUES];
00691                 else
00692                         pn = key->u.ccmp.rx_pn[tid];
00693                 memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN);
00694                 break;
00695         case WLAN_CIPHER_SUITE_AES_CMAC:
00696                 if (WARN_ON(tid != 0))
00697                         return;
00698                 pn = key->u.aes_cmac.rx_pn;
00699                 memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN);
00700                 break;
00701         }
00702 }
00703 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