537 lines
15 KiB
C
537 lines
15 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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* redistribution must be conditioned upon including a substantially
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* similar Disclaimer requirement for further binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <sys/cdefs.h>
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/*
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* Driver for the Atheros Wireless LAN controller.
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*
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* This software is derived from work of Atsushi Onoe; his contribution
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* is greatly appreciated.
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*/
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#include "opt_inet.h"
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#include "opt_ath.h"
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#include "opt_wlan.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/errno.h>
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#include <sys/callout.h>
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#include <sys/bus.h>
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#include <sys/endian.h>
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#include <sys/kthread.h>
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#include <sys/taskqueue.h>
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#include <sys/priv.h>
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#include <machine/bus.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_dl.h>
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#include <net/if_media.h>
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#include <net/if_types.h>
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#include <net/if_arp.h>
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#include <net/ethernet.h>
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#include <net/if_llc.h>
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#include <net80211/ieee80211_var.h>
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#include <net/bpf.h>
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#include <dev/ath/if_athvar.h>
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#include <dev/ath/if_ath_debug.h>
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#include <dev/ath/if_ath_keycache.h>
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#include <dev/ath/if_ath_misc.h>
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#ifdef ATH_DEBUG
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static void
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ath_keyprint(struct ath_softc *sc, const char *tag, u_int ix,
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const HAL_KEYVAL *hk, const u_int8_t mac[IEEE80211_ADDR_LEN])
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{
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static const char *ciphers[] = {
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"WEP",
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"AES-OCB",
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"AES-CCM",
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"CKIP",
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"TKIP",
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"CLR",
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};
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int i, n;
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printf("%s: [%02u] %-7s ", tag, ix, ciphers[hk->kv_type]);
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for (i = 0, n = hk->kv_len; i < n; i++)
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printf("%02x", hk->kv_val[i]);
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printf(" mac %s", ether_sprintf(mac));
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if (hk->kv_type == HAL_CIPHER_TKIP) {
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printf(" %s ", sc->sc_splitmic ? "mic" : "rxmic");
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for (i = 0; i < sizeof(hk->kv_mic); i++)
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printf("%02x", hk->kv_mic[i]);
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if (!sc->sc_splitmic) {
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printf(" txmic ");
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for (i = 0; i < sizeof(hk->kv_txmic); i++)
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printf("%02x", hk->kv_txmic[i]);
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}
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}
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printf("\n");
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}
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#endif
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/*
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* Set a TKIP key into the hardware. This handles the
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* potential distribution of key state to multiple key
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* cache slots for TKIP.
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*/
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static int
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ath_keyset_tkip(struct ath_softc *sc, const struct ieee80211_key *k,
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HAL_KEYVAL *hk, const u_int8_t mac[IEEE80211_ADDR_LEN])
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{
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#define IEEE80211_KEY_XR (IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV)
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static const u_int8_t zerobssid[IEEE80211_ADDR_LEN];
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struct ath_hal *ah = sc->sc_ah;
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KASSERT(k->wk_cipher->ic_cipher == IEEE80211_CIPHER_TKIP,
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("got a non-TKIP key, cipher %u", k->wk_cipher->ic_cipher));
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if ((k->wk_flags & IEEE80211_KEY_XR) == IEEE80211_KEY_XR) {
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if (sc->sc_splitmic) {
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/*
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* TX key goes at first index, RX key at the rx index.
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* The hal handles the MIC keys at index+64.
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*/
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memcpy(hk->kv_mic, k->wk_txmic, sizeof(hk->kv_mic));
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KEYPRINTF(sc, k->wk_keyix, hk, zerobssid);
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if (!ath_hal_keyset(ah, k->wk_keyix, hk, zerobssid))
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return 0;
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memcpy(hk->kv_mic, k->wk_rxmic, sizeof(hk->kv_mic));
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KEYPRINTF(sc, k->wk_keyix+32, hk, mac);
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/* XXX delete tx key on failure? */
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return ath_hal_keyset(ah, k->wk_keyix+32, hk, mac);
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} else {
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/*
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* Room for both TX+RX MIC keys in one key cache
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* slot, just set key at the first index; the hal
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* will handle the rest.
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*/
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memcpy(hk->kv_mic, k->wk_rxmic, sizeof(hk->kv_mic));
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memcpy(hk->kv_txmic, k->wk_txmic, sizeof(hk->kv_txmic));
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KEYPRINTF(sc, k->wk_keyix, hk, mac);
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return ath_hal_keyset(ah, k->wk_keyix, hk, mac);
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}
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} else if (k->wk_flags & IEEE80211_KEY_XMIT) {
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if (sc->sc_splitmic) {
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/*
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* NB: must pass MIC key in expected location when
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* the keycache only holds one MIC key per entry.
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*/
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memcpy(hk->kv_mic, k->wk_txmic, sizeof(hk->kv_txmic));
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} else
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memcpy(hk->kv_txmic, k->wk_txmic, sizeof(hk->kv_txmic));
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KEYPRINTF(sc, k->wk_keyix, hk, mac);
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return ath_hal_keyset(ah, k->wk_keyix, hk, mac);
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} else if (k->wk_flags & IEEE80211_KEY_RECV) {
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memcpy(hk->kv_mic, k->wk_rxmic, sizeof(hk->kv_mic));
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KEYPRINTF(sc, k->wk_keyix, hk, mac);
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return ath_hal_keyset(ah, k->wk_keyix, hk, mac);
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}
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return 0;
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#undef IEEE80211_KEY_XR
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}
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/*
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* Set a net80211 key into the hardware. This handles the
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* potential distribution of key state to multiple key
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* cache slots for TKIP with hardware MIC support.
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*/
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int
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ath_keyset(struct ath_softc *sc, struct ieee80211vap *vap,
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const struct ieee80211_key *k,
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struct ieee80211_node *bss)
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{
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static const u_int8_t ciphermap[] = {
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HAL_CIPHER_WEP, /* IEEE80211_CIPHER_WEP */
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HAL_CIPHER_TKIP, /* IEEE80211_CIPHER_TKIP */
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HAL_CIPHER_AES_OCB, /* IEEE80211_CIPHER_AES_OCB */
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HAL_CIPHER_AES_CCM, /* IEEE80211_CIPHER_AES_CCM */
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(u_int8_t) -1, /* 4 is not allocated */
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HAL_CIPHER_CKIP, /* IEEE80211_CIPHER_CKIP */
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HAL_CIPHER_CLR, /* IEEE80211_CIPHER_NONE */
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};
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struct ath_hal *ah = sc->sc_ah;
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const struct ieee80211_cipher *cip = k->wk_cipher;
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u_int8_t gmac[IEEE80211_ADDR_LEN];
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const u_int8_t *mac;
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HAL_KEYVAL hk;
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int ret;
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memset(&hk, 0, sizeof(hk));
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/*
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* Software crypto uses a "clear key" so non-crypto
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* state kept in the key cache are maintained and
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* so that rx frames have an entry to match.
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*/
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if ((k->wk_flags & IEEE80211_KEY_SWCRYPT) == 0) {
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KASSERT(cip->ic_cipher < nitems(ciphermap),
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("invalid cipher type %u", cip->ic_cipher));
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hk.kv_type = ciphermap[cip->ic_cipher];
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hk.kv_len = k->wk_keylen;
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memcpy(hk.kv_val, k->wk_key, k->wk_keylen);
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} else
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hk.kv_type = HAL_CIPHER_CLR;
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/*
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* If we're installing a clear cipher key and
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* the hardware doesn't support that, just succeed.
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* Leave it up to the net80211 layer to figure it out.
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*/
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if (hk.kv_type == HAL_CIPHER_CLR && sc->sc_hasclrkey == 0) {
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return (1);
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}
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/*
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* XXX TODO: check this:
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*
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* Group keys on hardware that supports multicast frame
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* key search should only be done in adhoc/hostap mode,
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* not STA mode.
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*
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* XXX TODO: what about mesh, tdma?
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*/
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#if 0
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if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
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vap->iv_opmode == IEEE80211_M_IBSS) &&
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#else
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if (
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#endif
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(k->wk_flags & IEEE80211_KEY_GROUP) &&
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sc->sc_mcastkey) {
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/*
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* Group keys on hardware that supports multicast frame
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* key search use a MAC that is the sender's address with
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* the multicast bit set instead of the app-specified address.
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*/
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IEEE80211_ADDR_COPY(gmac, bss->ni_macaddr);
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gmac[0] |= 0x01;
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mac = gmac;
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} else
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mac = k->wk_macaddr;
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ATH_LOCK(sc);
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ath_power_set_power_state(sc, HAL_PM_AWAKE);
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if (hk.kv_type == HAL_CIPHER_TKIP &&
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(k->wk_flags & IEEE80211_KEY_SWMIC) == 0) {
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ret = ath_keyset_tkip(sc, k, &hk, mac);
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} else {
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KEYPRINTF(sc, k->wk_keyix, &hk, mac);
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ret = ath_hal_keyset(ah, k->wk_keyix, &hk, mac);
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}
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ath_power_restore_power_state(sc);
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ATH_UNLOCK(sc);
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return (ret);
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}
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/*
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* Allocate tx/rx key slots for TKIP. We allocate two slots for
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* each key, one for decrypt/encrypt and the other for the MIC.
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*/
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static u_int16_t
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key_alloc_2pair(struct ath_softc *sc,
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ieee80211_keyix *txkeyix, ieee80211_keyix *rxkeyix)
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{
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u_int i, keyix;
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KASSERT(sc->sc_splitmic, ("key cache !split"));
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/* XXX could optimize */
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for (i = 0; i < nitems(sc->sc_keymap)/4; i++) {
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u_int8_t b = sc->sc_keymap[i];
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if (b != 0xff) {
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/*
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* One or more slots in this byte are free.
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*/
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keyix = i*NBBY;
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while (b & 1) {
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again:
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keyix++;
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b >>= 1;
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}
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/* XXX IEEE80211_KEY_XMIT | IEEE80211_KEY_RECV */
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if (isset(sc->sc_keymap, keyix+32) ||
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isset(sc->sc_keymap, keyix+64) ||
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isset(sc->sc_keymap, keyix+32+64)) {
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/* full pair unavailable */
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/* XXX statistic */
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if (keyix == (i+1)*NBBY) {
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/* no slots were appropriate, advance */
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continue;
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}
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goto again;
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}
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setbit(sc->sc_keymap, keyix);
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setbit(sc->sc_keymap, keyix+64);
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setbit(sc->sc_keymap, keyix+32);
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setbit(sc->sc_keymap, keyix+32+64);
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DPRINTF(sc, ATH_DEBUG_KEYCACHE,
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"%s: key pair %u,%u %u,%u\n",
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__func__, keyix, keyix+64,
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keyix+32, keyix+32+64);
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*txkeyix = keyix;
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*rxkeyix = keyix+32;
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return 1;
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}
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}
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DPRINTF(sc, ATH_DEBUG_KEYCACHE, "%s: out of pair space\n", __func__);
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return 0;
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}
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/*
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* Allocate tx/rx key slots for TKIP. We allocate two slots for
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* each key, one for decrypt/encrypt and the other for the MIC.
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*/
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static u_int16_t
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key_alloc_pair(struct ath_softc *sc,
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ieee80211_keyix *txkeyix, ieee80211_keyix *rxkeyix)
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{
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u_int i, keyix;
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KASSERT(!sc->sc_splitmic, ("key cache split"));
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/* XXX could optimize */
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for (i = 0; i < nitems(sc->sc_keymap)/4; i++) {
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u_int8_t b = sc->sc_keymap[i];
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if (b != 0xff) {
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/*
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* One or more slots in this byte are free.
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*/
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keyix = i*NBBY;
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while (b & 1) {
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again:
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keyix++;
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b >>= 1;
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}
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if (isset(sc->sc_keymap, keyix+64)) {
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/* full pair unavailable */
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/* XXX statistic */
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if (keyix == (i+1)*NBBY) {
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/* no slots were appropriate, advance */
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continue;
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}
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goto again;
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}
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setbit(sc->sc_keymap, keyix);
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setbit(sc->sc_keymap, keyix+64);
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DPRINTF(sc, ATH_DEBUG_KEYCACHE,
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"%s: key pair %u,%u\n",
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__func__, keyix, keyix+64);
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*txkeyix = *rxkeyix = keyix;
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return 1;
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}
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}
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DPRINTF(sc, ATH_DEBUG_KEYCACHE, "%s: out of pair space\n", __func__);
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return 0;
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}
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/*
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* Allocate a single key cache slot.
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*/
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static int
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key_alloc_single(struct ath_softc *sc,
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ieee80211_keyix *txkeyix, ieee80211_keyix *rxkeyix)
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{
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u_int i, keyix;
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if (sc->sc_hasclrkey == 0) {
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/*
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* Map to slot 0 for the AR5210.
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*/
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*txkeyix = *rxkeyix = 0;
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return (1);
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}
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/* XXX try i,i+32,i+64,i+32+64 to minimize key pair conflicts */
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for (i = 0; i < nitems(sc->sc_keymap); i++) {
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u_int8_t b = sc->sc_keymap[i];
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if (b != 0xff) {
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/*
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* One or more slots are free.
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*/
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keyix = i*NBBY;
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while (b & 1)
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keyix++, b >>= 1;
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setbit(sc->sc_keymap, keyix);
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DPRINTF(sc, ATH_DEBUG_KEYCACHE, "%s: key %u\n",
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__func__, keyix);
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*txkeyix = *rxkeyix = keyix;
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return 1;
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}
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}
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DPRINTF(sc, ATH_DEBUG_KEYCACHE, "%s: out of space\n", __func__);
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return 0;
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}
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/*
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* Allocate one or more key cache slots for a uniacst key. The
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* key itself is needed only to identify the cipher. For hardware
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* TKIP with split cipher+MIC keys we allocate two key cache slot
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* pairs so that we can setup separate TX and RX MIC keys. Note
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* that the MIC key for a TKIP key at slot i is assumed by the
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* hardware to be at slot i+64. This limits TKIP keys to the first
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* 64 entries.
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*/
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int
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ath_key_alloc(struct ieee80211vap *vap, struct ieee80211_key *k,
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ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix)
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{
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struct ath_softc *sc = vap->iv_ic->ic_softc;
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/*
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* Group key allocation must be handled specially for
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* parts that do not support multicast key cache search
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* functionality. For those parts the key id must match
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* the h/w key index so lookups find the right key. On
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* parts w/ the key search facility we install the sender's
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* mac address (with the high bit set) and let the hardware
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* find the key w/o using the key id. This is preferred as
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* it permits us to support multiple users for adhoc and/or
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* multi-station operation.
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*/
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if (k->wk_keyix != IEEE80211_KEYIX_NONE) {
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/*
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* Only global keys should have key index assigned.
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*/
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if (!(&vap->iv_nw_keys[0] <= k &&
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k < &vap->iv_nw_keys[IEEE80211_WEP_NKID])) {
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/* should not happen */
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DPRINTF(sc, ATH_DEBUG_KEYCACHE,
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"%s: bogus group key\n", __func__);
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return 0;
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}
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if (vap->iv_opmode != IEEE80211_M_HOSTAP ||
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!(k->wk_flags & IEEE80211_KEY_GROUP) ||
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!sc->sc_mcastkey) {
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/*
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* XXX we pre-allocate the global keys so
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* have no way to check if they've already
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* been allocated.
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*/
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*keyix = *rxkeyix =
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ieee80211_crypto_get_key_wepidx(vap, k);
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return 1;
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}
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/*
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* Group key and device supports multicast key search.
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*/
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k->wk_keyix = IEEE80211_KEYIX_NONE;
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}
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/*
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* We allocate two pair for TKIP when using the h/w to do
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* the MIC. For everything else, including software crypto,
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* we allocate a single entry. Note that s/w crypto requires
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* a pass-through slot on the 5211 and 5212. The 5210 does
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* not support pass-through cache entries and we map all
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* those requests to slot 0.
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*/
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if (k->wk_flags & IEEE80211_KEY_SWCRYPT) {
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return key_alloc_single(sc, keyix, rxkeyix);
|
|
} else if (k->wk_cipher->ic_cipher == IEEE80211_CIPHER_TKIP &&
|
|
(k->wk_flags & IEEE80211_KEY_SWMIC) == 0) {
|
|
if (sc->sc_splitmic)
|
|
return key_alloc_2pair(sc, keyix, rxkeyix);
|
|
else
|
|
return key_alloc_pair(sc, keyix, rxkeyix);
|
|
} else {
|
|
return key_alloc_single(sc, keyix, rxkeyix);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Delete an entry in the key cache allocated by ath_key_alloc.
|
|
*/
|
|
int
|
|
ath_key_delete(struct ieee80211vap *vap, const struct ieee80211_key *k)
|
|
{
|
|
struct ath_softc *sc = vap->iv_ic->ic_softc;
|
|
struct ath_hal *ah = sc->sc_ah;
|
|
const struct ieee80211_cipher *cip = k->wk_cipher;
|
|
u_int keyix = k->wk_keyix;
|
|
|
|
DPRINTF(sc, ATH_DEBUG_KEYCACHE, "%s: delete key %u\n", __func__, keyix);
|
|
|
|
ATH_LOCK(sc);
|
|
ath_power_set_power_state(sc, HAL_PM_AWAKE);
|
|
ath_hal_keyreset(ah, keyix);
|
|
/*
|
|
* Handle split tx/rx keying required for TKIP with h/w MIC.
|
|
*/
|
|
if (cip->ic_cipher == IEEE80211_CIPHER_TKIP &&
|
|
(k->wk_flags & IEEE80211_KEY_SWMIC) == 0 && sc->sc_splitmic)
|
|
ath_hal_keyreset(ah, keyix+32); /* RX key */
|
|
if (keyix >= IEEE80211_WEP_NKID) {
|
|
/*
|
|
* Don't touch keymap entries for global keys so
|
|
* they are never considered for dynamic allocation.
|
|
*/
|
|
clrbit(sc->sc_keymap, keyix);
|
|
if (cip->ic_cipher == IEEE80211_CIPHER_TKIP &&
|
|
(k->wk_flags & IEEE80211_KEY_SWMIC) == 0) {
|
|
clrbit(sc->sc_keymap, keyix+64); /* TX key MIC */
|
|
if (sc->sc_splitmic) {
|
|
/* +32 for RX key, +32+64 for RX key MIC */
|
|
clrbit(sc->sc_keymap, keyix+32);
|
|
clrbit(sc->sc_keymap, keyix+32+64);
|
|
}
|
|
}
|
|
}
|
|
ath_power_restore_power_state(sc);
|
|
ATH_UNLOCK(sc);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Set the key cache contents for the specified key. Key cache
|
|
* slot(s) must already have been allocated by ath_key_alloc.
|
|
*/
|
|
int
|
|
ath_key_set(struct ieee80211vap *vap, const struct ieee80211_key *k)
|
|
{
|
|
struct ath_softc *sc = vap->iv_ic->ic_softc;
|
|
|
|
return ath_keyset(sc, vap, k, vap->iv_bss);
|
|
}
|