[MAC80211]: introduce util.c
authorJohannes Berg <johannes@sipsolutions.net>
Fri, 27 Jul 2007 13:43:23 +0000 (15:43 +0200)
committerDavid S. Miller <davem@sunset.davemloft.net>
Wed, 10 Oct 2007 23:47:36 +0000 (16:47 -0700)
Introduce a new file util.c and move a whole bunch of functions into it.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
net/mac80211/Makefile
net/mac80211/ieee80211.c
net/mac80211/ieee80211_i.h
net/mac80211/util.c [new file with mode: 0644]

index d95de3f..122b23e 100644 (file)
@@ -21,4 +21,5 @@ mac80211-objs := \
        rx.o \
        tx.o \
        key.o \
+       util.o \
        $(mac80211-objs-y)
index f240f97..1981058 100644 (file)
 #include "debugfs.h"
 #include "debugfs_netdev.h"
 
-/* privid for wiphys to determine whether they belong to us or not */
-void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
-
-/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
-/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
-const unsigned char rfc1042_header[] =
-       { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
-
-/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
-const unsigned char bridge_tunnel_header[] =
-       { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
-
-/* No encapsulation header if EtherType < 0x600 (=length) */
-static const unsigned char eapol_header[] =
-       { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
-
-
 /*
  * For seeing transmitted packets on monitor interfaces
  * we have a radiotap header too.
@@ -661,346 +644,6 @@ int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 
 /* everything else */
 
-static int rate_list_match(const int *rate_list, int rate)
-{
-       int i;
-
-       if (!rate_list)
-               return 0;
-
-       for (i = 0; rate_list[i] >= 0; i++)
-               if (rate_list[i] == rate)
-                       return 1;
-
-       return 0;
-}
-
-void ieee80211_prepare_rates(struct ieee80211_local *local,
-                            struct ieee80211_hw_mode *mode)
-{
-       int i;
-
-       for (i = 0; i < mode->num_rates; i++) {
-               struct ieee80211_rate *rate = &mode->rates[i];
-
-               rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
-                                IEEE80211_RATE_BASIC);
-
-               if (local->supp_rates[mode->mode]) {
-                       if (!rate_list_match(local->supp_rates[mode->mode],
-                                            rate->rate))
-                               continue;
-               }
-
-               rate->flags |= IEEE80211_RATE_SUPPORTED;
-
-               /* Use configured basic rate set if it is available. If not,
-                * use defaults that are sane for most cases. */
-               if (local->basic_rates[mode->mode]) {
-                       if (rate_list_match(local->basic_rates[mode->mode],
-                                           rate->rate))
-                               rate->flags |= IEEE80211_RATE_BASIC;
-               } else switch (mode->mode) {
-               case MODE_IEEE80211A:
-                       if (rate->rate == 60 || rate->rate == 120 ||
-                           rate->rate == 240)
-                               rate->flags |= IEEE80211_RATE_BASIC;
-                       break;
-               case MODE_IEEE80211B:
-                       if (rate->rate == 10 || rate->rate == 20)
-                               rate->flags |= IEEE80211_RATE_BASIC;
-                       break;
-               case MODE_ATHEROS_TURBO:
-                       if (rate->rate == 120 || rate->rate == 240 ||
-                           rate->rate == 480)
-                               rate->flags |= IEEE80211_RATE_BASIC;
-                       break;
-               case MODE_IEEE80211G:
-                       if (rate->rate == 10 || rate->rate == 20 ||
-                           rate->rate == 55 || rate->rate == 110)
-                               rate->flags |= IEEE80211_RATE_BASIC;
-                       break;
-               }
-
-               /* Set ERP and MANDATORY flags based on phymode */
-               switch (mode->mode) {
-               case MODE_IEEE80211A:
-                       if (rate->rate == 60 || rate->rate == 120 ||
-                           rate->rate == 240)
-                               rate->flags |= IEEE80211_RATE_MANDATORY;
-                       break;
-               case MODE_IEEE80211B:
-                       if (rate->rate == 10)
-                               rate->flags |= IEEE80211_RATE_MANDATORY;
-                       break;
-               case MODE_ATHEROS_TURBO:
-                       break;
-               case MODE_IEEE80211G:
-                       if (rate->rate == 10 || rate->rate == 20 ||
-                           rate->rate == 55 || rate->rate == 110 ||
-                           rate->rate == 60 || rate->rate == 120 ||
-                           rate->rate == 240)
-                               rate->flags |= IEEE80211_RATE_MANDATORY;
-                       break;
-               }
-               if (ieee80211_is_erp_rate(mode->mode, rate->rate))
-                       rate->flags |= IEEE80211_RATE_ERP;
-       }
-}
-
-u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
-{
-       u16 fc;
-
-       if (len < 24)
-               return NULL;
-
-       fc = le16_to_cpu(hdr->frame_control);
-
-       switch (fc & IEEE80211_FCTL_FTYPE) {
-       case IEEE80211_FTYPE_DATA:
-               switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
-               case IEEE80211_FCTL_TODS:
-                       return hdr->addr1;
-               case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
-                       return NULL;
-               case IEEE80211_FCTL_FROMDS:
-                       return hdr->addr2;
-               case 0:
-                       return hdr->addr3;
-               }
-               break;
-       case IEEE80211_FTYPE_MGMT:
-               return hdr->addr3;
-       case IEEE80211_FTYPE_CTL:
-               if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
-                       return hdr->addr1;
-               else
-                       return NULL;
-       }
-
-       return NULL;
-}
-
-int ieee80211_get_hdrlen(u16 fc)
-{
-       int hdrlen = 24;
-
-       switch (fc & IEEE80211_FCTL_FTYPE) {
-       case IEEE80211_FTYPE_DATA:
-               if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
-                       hdrlen = 30; /* Addr4 */
-               /*
-                * The QoS Control field is two bytes and its presence is
-                * indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
-                * hdrlen if that bit is set.
-                * This works by masking out the bit and shifting it to
-                * bit position 1 so the result has the value 0 or 2.
-                */
-               hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
-                               >> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
-               break;
-       case IEEE80211_FTYPE_CTL:
-               /*
-                * ACK and CTS are 10 bytes, all others 16. To see how
-                * to get this condition consider
-                *   subtype mask:   0b0000000011110000 (0x00F0)
-                *   ACK subtype:    0b0000000011010000 (0x00D0)
-                *   CTS subtype:    0b0000000011000000 (0x00C0)
-                *   bits that matter:         ^^^      (0x00E0)
-                *   value of those: 0b0000000011000000 (0x00C0)
-                */
-               if ((fc & 0xE0) == 0xC0)
-                       hdrlen = 10;
-               else
-                       hdrlen = 16;
-               break;
-       }
-
-       return hdrlen;
-}
-EXPORT_SYMBOL(ieee80211_get_hdrlen);
-
-int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
-{
-       const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *) skb->data;
-       int hdrlen;
-
-       if (unlikely(skb->len < 10))
-               return 0;
-       hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
-       if (unlikely(hdrlen > skb->len))
-               return 0;
-       return hdrlen;
-}
-EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
-
-
-int ieee80211_is_eapol(const struct sk_buff *skb)
-{
-       const struct ieee80211_hdr *hdr;
-       u16 fc;
-       int hdrlen;
-
-       if (unlikely(skb->len < 10))
-               return 0;
-
-       hdr = (const struct ieee80211_hdr *) skb->data;
-       fc = le16_to_cpu(hdr->frame_control);
-
-       if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
-               return 0;
-
-       hdrlen = ieee80211_get_hdrlen(fc);
-
-       if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
-                    memcmp(skb->data + hdrlen, eapol_header,
-                           sizeof(eapol_header)) == 0))
-               return 1;
-
-       return 0;
-}
-
-void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
-{
-       struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
-
-       hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
-       if (tx->u.tx.extra_frag) {
-               struct ieee80211_hdr *fhdr;
-               int i;
-               for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
-                       fhdr = (struct ieee80211_hdr *)
-                               tx->u.tx.extra_frag[i]->data;
-                       fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
-               }
-       }
-}
-
-static int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
-                                   int rate, int erp, int short_preamble)
-{
-       int dur;
-
-       /* calculate duration (in microseconds, rounded up to next higher
-        * integer if it includes a fractional microsecond) to send frame of
-        * len bytes (does not include FCS) at the given rate. Duration will
-        * also include SIFS.
-        *
-        * rate is in 100 kbps, so divident is multiplied by 10 in the
-        * DIV_ROUND_UP() operations.
-        */
-
-       if (local->hw.conf.phymode == MODE_IEEE80211A || erp ||
-           local->hw.conf.phymode == MODE_ATHEROS_TURBO) {
-               /*
-                * OFDM:
-                *
-                * N_DBPS = DATARATE x 4
-                * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
-                *      (16 = SIGNAL time, 6 = tail bits)
-                * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
-                *
-                * T_SYM = 4 usec
-                * 802.11a - 17.5.2: aSIFSTime = 16 usec
-                * 802.11g - 19.8.4: aSIFSTime = 10 usec +
-                *      signal ext = 6 usec
-                */
-               /* FIX: Atheros Turbo may have different (shorter) duration? */
-               dur = 16; /* SIFS + signal ext */
-               dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
-               dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
-               dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
-                                       4 * rate); /* T_SYM x N_SYM */
-       } else {
-               /*
-                * 802.11b or 802.11g with 802.11b compatibility:
-                * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
-                * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
-                *
-                * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
-                * aSIFSTime = 10 usec
-                * aPreambleLength = 144 usec or 72 usec with short preamble
-                * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
-                */
-               dur = 10; /* aSIFSTime = 10 usec */
-               dur += short_preamble ? (72 + 24) : (144 + 48);
-
-               dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
-       }
-
-       return dur;
-}
-
-/* Exported duration function for driver use */
-__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
-                                       size_t frame_len, int rate)
-{
-       struct ieee80211_local *local = hw_to_local(hw);
-       u16 dur;
-       int erp;
-
-       erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
-       dur = ieee80211_frame_duration(local, frame_len, rate,
-                                      erp, local->short_preamble);
-
-       return cpu_to_le16(dur);
-}
-EXPORT_SYMBOL(ieee80211_generic_frame_duration);
-
-__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
-                             size_t frame_len,
-                             const struct ieee80211_tx_control *frame_txctl)
-{
-       struct ieee80211_local *local = hw_to_local(hw);
-       struct ieee80211_rate *rate;
-       int short_preamble = local->short_preamble;
-       int erp;
-       u16 dur;
-
-       rate = frame_txctl->rts_rate;
-       erp = !!(rate->flags & IEEE80211_RATE_ERP);
-
-       /* CTS duration */
-       dur = ieee80211_frame_duration(local, 10, rate->rate,
-                                      erp, short_preamble);
-       /* Data frame duration */
-       dur += ieee80211_frame_duration(local, frame_len, rate->rate,
-                                       erp, short_preamble);
-       /* ACK duration */
-       dur += ieee80211_frame_duration(local, 10, rate->rate,
-                                       erp, short_preamble);
-
-       return cpu_to_le16(dur);
-}
-EXPORT_SYMBOL(ieee80211_rts_duration);
-
-__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
-                                   size_t frame_len,
-                                   const struct ieee80211_tx_control *frame_txctl)
-{
-       struct ieee80211_local *local = hw_to_local(hw);
-       struct ieee80211_rate *rate;
-       int short_preamble = local->short_preamble;
-       int erp;
-       u16 dur;
-
-       rate = frame_txctl->rts_rate;
-       erp = !!(rate->flags & IEEE80211_RATE_ERP);
-
-       /* Data frame duration */
-       dur = ieee80211_frame_duration(local, frame_len, rate->rate,
-                                      erp, short_preamble);
-       if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
-               /* ACK duration */
-               dur += ieee80211_frame_duration(local, 10, rate->rate,
-                                               erp, short_preamble);
-       }
-
-       return cpu_to_le16(dur);
-}
-EXPORT_SYMBOL(ieee80211_ctstoself_duration);
-
 static int __ieee80211_if_config(struct net_device *dev,
                                 struct sk_buff *beacon,
                                 struct ieee80211_tx_control *control)
@@ -1123,27 +766,6 @@ struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
 }
 EXPORT_SYMBOL(ieee80211_get_mc_list_item);
 
-struct ieee80211_rate *
-ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
-{
-       struct ieee80211_hw_mode *mode;
-       int r;
-
-       list_for_each_entry(mode, &local->modes_list, list) {
-               if (mode->mode != phymode)
-                       continue;
-               for (r = 0; r < mode->num_rates; r++) {
-                       struct ieee80211_rate *rate = &mode->rates[r];
-                       if (rate->val == hw_rate ||
-                           (rate->flags & IEEE80211_RATE_PREAMBLE2 &&
-                            rate->val2 == hw_rate))
-                               return rate;
-               }
-       }
-
-       return NULL;
-}
-
 static void ieee80211_stat_refresh(unsigned long data)
 {
        struct ieee80211_local *local = (struct ieee80211_local *) data;
@@ -1856,65 +1478,6 @@ void ieee80211_free_hw(struct ieee80211_hw *hw)
 }
 EXPORT_SYMBOL(ieee80211_free_hw);
 
-void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
-{
-       struct ieee80211_local *local = hw_to_local(hw);
-
-       if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
-                              &local->state[queue])) {
-               if (test_bit(IEEE80211_LINK_STATE_PENDING,
-                            &local->state[queue]))
-                       tasklet_schedule(&local->tx_pending_tasklet);
-               else
-                       if (!ieee80211_qdisc_installed(local->mdev)) {
-                               if (queue == 0)
-                                       netif_wake_queue(local->mdev);
-                       } else
-                               __netif_schedule(local->mdev);
-       }
-}
-EXPORT_SYMBOL(ieee80211_wake_queue);
-
-void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
-{
-       struct ieee80211_local *local = hw_to_local(hw);
-
-       if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
-               netif_stop_queue(local->mdev);
-       set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
-}
-EXPORT_SYMBOL(ieee80211_stop_queue);
-
-void ieee80211_start_queues(struct ieee80211_hw *hw)
-{
-       struct ieee80211_local *local = hw_to_local(hw);
-       int i;
-
-       for (i = 0; i < local->hw.queues; i++)
-               clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
-       if (!ieee80211_qdisc_installed(local->mdev))
-               netif_start_queue(local->mdev);
-}
-EXPORT_SYMBOL(ieee80211_start_queues);
-
-void ieee80211_stop_queues(struct ieee80211_hw *hw)
-{
-       int i;
-
-       for (i = 0; i < hw->queues; i++)
-               ieee80211_stop_queue(hw, i);
-}
-EXPORT_SYMBOL(ieee80211_stop_queues);
-
-void ieee80211_wake_queues(struct ieee80211_hw *hw)
-{
-       int i;
-
-       for (i = 0; i < hw->queues; i++)
-               ieee80211_wake_queue(hw, i);
-}
-EXPORT_SYMBOL(ieee80211_wake_queues);
-
 struct net_device_stats *ieee80211_dev_stats(struct net_device *dev)
 {
        struct ieee80211_sub_if_data *sdata;
index 28414b3..ed00552 100644 (file)
@@ -733,14 +733,6 @@ struct ieee80211_rate *ieee80211_get_rate(struct ieee80211_local *local,
 void ieee80211_key_threshold_notify(struct net_device *dev,
                                    struct ieee80211_key *key,
                                    struct sta_info *sta);
-u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len);
-int ieee80211_is_eapol(const struct sk_buff *skb);
-
-extern const unsigned char rfc1042_header[6];
-extern const unsigned char bridge_tunnel_header[6];
-
-int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
-                            int rate, int erp, int short_preamble);
 
 /* ieee80211_ioctl.c */
 extern const struct iw_handler_def ieee80211_iw_handler_def;
@@ -833,7 +825,13 @@ struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
                                          int idx, size_t key_len, gfp_t flags);
 void ieee80211_key_free(struct ieee80211_key *key);
 
-/* for wiphy privid */
-extern void *mac80211_wiphy_privid;
+/* utility functions/constants */
+extern void *mac80211_wiphy_privid; /* for wiphy privid */
+extern const unsigned char rfc1042_header[6];
+extern const unsigned char bridge_tunnel_header[6];
+u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len);
+int ieee80211_is_eapol(const struct sk_buff *skb);
+int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
+                            int rate, int erp, int short_preamble);
 
 #endif /* IEEE80211_I_H */
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
new file mode 100644 (file)
index 0000000..c456583
--- /dev/null
@@ -0,0 +1,463 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
+ * Copyright 2007      Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * utilities for mac80211
+ */
+
+#include <net/mac80211.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <linux/wireless.h>
+#include <linux/bitmap.h>
+#include <net/cfg80211.h>
+
+#include "ieee80211_i.h"
+#include "ieee80211_rate.h"
+#include "wme.h"
+
+/* privid for wiphys to determine whether they belong to us or not */
+void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
+
+/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
+/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
+const unsigned char rfc1042_header[] =
+       { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
+
+/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
+const unsigned char bridge_tunnel_header[] =
+       { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
+
+/* No encapsulation header if EtherType < 0x600 (=length) */
+static const unsigned char eapol_header[] =
+       { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
+
+
+static int rate_list_match(const int *rate_list, int rate)
+{
+       int i;
+
+       if (!rate_list)
+               return 0;
+
+       for (i = 0; rate_list[i] >= 0; i++)
+               if (rate_list[i] == rate)
+                       return 1;
+
+       return 0;
+}
+
+void ieee80211_prepare_rates(struct ieee80211_local *local,
+                            struct ieee80211_hw_mode *mode)
+{
+       int i;
+
+       for (i = 0; i < mode->num_rates; i++) {
+               struct ieee80211_rate *rate = &mode->rates[i];
+
+               rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
+                                IEEE80211_RATE_BASIC);
+
+               if (local->supp_rates[mode->mode]) {
+                       if (!rate_list_match(local->supp_rates[mode->mode],
+                                            rate->rate))
+                               continue;
+               }
+
+               rate->flags |= IEEE80211_RATE_SUPPORTED;
+
+               /* Use configured basic rate set if it is available. If not,
+                * use defaults that are sane for most cases. */
+               if (local->basic_rates[mode->mode]) {
+                       if (rate_list_match(local->basic_rates[mode->mode],
+                                           rate->rate))
+                               rate->flags |= IEEE80211_RATE_BASIC;
+               } else switch (mode->mode) {
+               case MODE_IEEE80211A:
+                       if (rate->rate == 60 || rate->rate == 120 ||
+                           rate->rate == 240)
+                               rate->flags |= IEEE80211_RATE_BASIC;
+                       break;
+               case MODE_IEEE80211B:
+                       if (rate->rate == 10 || rate->rate == 20)
+                               rate->flags |= IEEE80211_RATE_BASIC;
+                       break;
+               case MODE_ATHEROS_TURBO:
+                       if (rate->rate == 120 || rate->rate == 240 ||
+                           rate->rate == 480)
+                               rate->flags |= IEEE80211_RATE_BASIC;
+                       break;
+               case MODE_IEEE80211G:
+                       if (rate->rate == 10 || rate->rate == 20 ||
+                           rate->rate == 55 || rate->rate == 110)
+                               rate->flags |= IEEE80211_RATE_BASIC;
+                       break;
+               }
+
+               /* Set ERP and MANDATORY flags based on phymode */
+               switch (mode->mode) {
+               case MODE_IEEE80211A:
+                       if (rate->rate == 60 || rate->rate == 120 ||
+                           rate->rate == 240)
+                               rate->flags |= IEEE80211_RATE_MANDATORY;
+                       break;
+               case MODE_IEEE80211B:
+                       if (rate->rate == 10)
+                               rate->flags |= IEEE80211_RATE_MANDATORY;
+                       break;
+               case MODE_ATHEROS_TURBO:
+                       break;
+               case MODE_IEEE80211G:
+                       if (rate->rate == 10 || rate->rate == 20 ||
+                           rate->rate == 55 || rate->rate == 110 ||
+                           rate->rate == 60 || rate->rate == 120 ||
+                           rate->rate == 240)
+                               rate->flags |= IEEE80211_RATE_MANDATORY;
+                       break;
+               }
+               if (ieee80211_is_erp_rate(mode->mode, rate->rate))
+                       rate->flags |= IEEE80211_RATE_ERP;
+       }
+}
+
+u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
+{
+       u16 fc;
+
+       if (len < 24)
+               return NULL;
+
+       fc = le16_to_cpu(hdr->frame_control);
+
+       switch (fc & IEEE80211_FCTL_FTYPE) {
+       case IEEE80211_FTYPE_DATA:
+               switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
+               case IEEE80211_FCTL_TODS:
+                       return hdr->addr1;
+               case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
+                       return NULL;
+               case IEEE80211_FCTL_FROMDS:
+                       return hdr->addr2;
+               case 0:
+                       return hdr->addr3;
+               }
+               break;
+       case IEEE80211_FTYPE_MGMT:
+               return hdr->addr3;
+       case IEEE80211_FTYPE_CTL:
+               if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
+                       return hdr->addr1;
+               else
+                       return NULL;
+       }
+
+       return NULL;
+}
+
+int ieee80211_get_hdrlen(u16 fc)
+{
+       int hdrlen = 24;
+
+       switch (fc & IEEE80211_FCTL_FTYPE) {
+       case IEEE80211_FTYPE_DATA:
+               if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
+                       hdrlen = 30; /* Addr4 */
+               /*
+                * The QoS Control field is two bytes and its presence is
+                * indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
+                * hdrlen if that bit is set.
+                * This works by masking out the bit and shifting it to
+                * bit position 1 so the result has the value 0 or 2.
+                */
+               hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
+                               >> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
+               break;
+       case IEEE80211_FTYPE_CTL:
+               /*
+                * ACK and CTS are 10 bytes, all others 16. To see how
+                * to get this condition consider
+                *   subtype mask:   0b0000000011110000 (0x00F0)
+                *   ACK subtype:    0b0000000011010000 (0x00D0)
+                *   CTS subtype:    0b0000000011000000 (0x00C0)
+                *   bits that matter:         ^^^      (0x00E0)
+                *   value of those: 0b0000000011000000 (0x00C0)
+                */
+               if ((fc & 0xE0) == 0xC0)
+                       hdrlen = 10;
+               else
+                       hdrlen = 16;
+               break;
+       }
+
+       return hdrlen;
+}
+EXPORT_SYMBOL(ieee80211_get_hdrlen);
+
+int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
+{
+       const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *) skb->data;
+       int hdrlen;
+
+       if (unlikely(skb->len < 10))
+               return 0;
+       hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
+       if (unlikely(hdrlen > skb->len))
+               return 0;
+       return hdrlen;
+}
+EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
+
+int ieee80211_is_eapol(const struct sk_buff *skb)
+{
+       const struct ieee80211_hdr *hdr;
+       u16 fc;
+       int hdrlen;
+
+       if (unlikely(skb->len < 10))
+               return 0;
+
+       hdr = (const struct ieee80211_hdr *) skb->data;
+       fc = le16_to_cpu(hdr->frame_control);
+
+       if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
+               return 0;
+
+       hdrlen = ieee80211_get_hdrlen(fc);
+
+       if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
+                    memcmp(skb->data + hdrlen, eapol_header,
+                           sizeof(eapol_header)) == 0))
+               return 1;
+
+       return 0;
+}
+
+void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
+{
+       struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
+
+       hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
+       if (tx->u.tx.extra_frag) {
+               struct ieee80211_hdr *fhdr;
+               int i;
+               for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
+                       fhdr = (struct ieee80211_hdr *)
+                               tx->u.tx.extra_frag[i]->data;
+                       fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
+               }
+       }
+}
+
+int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
+                            int rate, int erp, int short_preamble)
+{
+       int dur;
+
+       /* calculate duration (in microseconds, rounded up to next higher
+        * integer if it includes a fractional microsecond) to send frame of
+        * len bytes (does not include FCS) at the given rate. Duration will
+        * also include SIFS.
+        *
+        * rate is in 100 kbps, so divident is multiplied by 10 in the
+        * DIV_ROUND_UP() operations.
+        */
+
+       if (local->hw.conf.phymode == MODE_IEEE80211A || erp ||
+           local->hw.conf.phymode == MODE_ATHEROS_TURBO) {
+               /*
+                * OFDM:
+                *
+                * N_DBPS = DATARATE x 4
+                * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
+                *      (16 = SIGNAL time, 6 = tail bits)
+                * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
+                *
+                * T_SYM = 4 usec
+                * 802.11a - 17.5.2: aSIFSTime = 16 usec
+                * 802.11g - 19.8.4: aSIFSTime = 10 usec +
+                *      signal ext = 6 usec
+                */
+               /* FIX: Atheros Turbo may have different (shorter) duration? */
+               dur = 16; /* SIFS + signal ext */
+               dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
+               dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
+               dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
+                                       4 * rate); /* T_SYM x N_SYM */
+       } else {
+               /*
+                * 802.11b or 802.11g with 802.11b compatibility:
+                * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
+                * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
+                *
+                * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
+                * aSIFSTime = 10 usec
+                * aPreambleLength = 144 usec or 72 usec with short preamble
+                * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
+                */
+               dur = 10; /* aSIFSTime = 10 usec */
+               dur += short_preamble ? (72 + 24) : (144 + 48);
+
+               dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
+       }
+
+       return dur;
+}
+
+/* Exported duration function for driver use */
+__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
+                                       size_t frame_len, int rate)
+{
+       struct ieee80211_local *local = hw_to_local(hw);
+       u16 dur;
+       int erp;
+
+       erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
+       dur = ieee80211_frame_duration(local, frame_len, rate,
+                                      erp, local->short_preamble);
+
+       return cpu_to_le16(dur);
+}
+EXPORT_SYMBOL(ieee80211_generic_frame_duration);
+
+__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
+                             size_t frame_len,
+                             const struct ieee80211_tx_control *frame_txctl)
+{
+       struct ieee80211_local *local = hw_to_local(hw);
+       struct ieee80211_rate *rate;
+       int short_preamble = local->short_preamble;
+       int erp;
+       u16 dur;
+
+       rate = frame_txctl->rts_rate;
+       erp = !!(rate->flags & IEEE80211_RATE_ERP);
+
+       /* CTS duration */
+       dur = ieee80211_frame_duration(local, 10, rate->rate,
+                                      erp, short_preamble);
+       /* Data frame duration */
+       dur += ieee80211_frame_duration(local, frame_len, rate->rate,
+                                       erp, short_preamble);
+       /* ACK duration */
+       dur += ieee80211_frame_duration(local, 10, rate->rate,
+                                       erp, short_preamble);
+
+       return cpu_to_le16(dur);
+}
+EXPORT_SYMBOL(ieee80211_rts_duration);
+
+__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
+                                   size_t frame_len,
+                                   const struct ieee80211_tx_control *frame_txctl)
+{
+       struct ieee80211_local *local = hw_to_local(hw);
+       struct ieee80211_rate *rate;
+       int short_preamble = local->short_preamble;
+       int erp;
+       u16 dur;
+
+       rate = frame_txctl->rts_rate;
+       erp = !!(rate->flags & IEEE80211_RATE_ERP);
+
+       /* Data frame duration */
+       dur = ieee80211_frame_duration(local, frame_len, rate->rate,
+                                      erp, short_preamble);
+       if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
+               /* ACK duration */
+               dur += ieee80211_frame_duration(local, 10, rate->rate,
+                                               erp, short_preamble);
+       }
+
+       return cpu_to_le16(dur);
+}
+EXPORT_SYMBOL(ieee80211_ctstoself_duration);
+
+struct ieee80211_rate *
+ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
+{
+       struct ieee80211_hw_mode *mode;
+       int r;
+
+       list_for_each_entry(mode, &local->modes_list, list) {
+               if (mode->mode != phymode)
+                       continue;
+               for (r = 0; r < mode->num_rates; r++) {
+                       struct ieee80211_rate *rate = &mode->rates[r];
+                       if (rate->val == hw_rate ||
+                           (rate->flags & IEEE80211_RATE_PREAMBLE2 &&
+                            rate->val2 == hw_rate))
+                               return rate;
+               }
+       }
+
+       return NULL;
+}
+
+void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
+{
+       struct ieee80211_local *local = hw_to_local(hw);
+
+       if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
+                              &local->state[queue])) {
+               if (test_bit(IEEE80211_LINK_STATE_PENDING,
+                            &local->state[queue]))
+                       tasklet_schedule(&local->tx_pending_tasklet);
+               else
+                       if (!ieee80211_qdisc_installed(local->mdev)) {
+                               if (queue == 0)
+                                       netif_wake_queue(local->mdev);
+                       } else
+                               __netif_schedule(local->mdev);
+       }
+}
+EXPORT_SYMBOL(ieee80211_wake_queue);
+
+void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
+{
+       struct ieee80211_local *local = hw_to_local(hw);
+
+       if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
+               netif_stop_queue(local->mdev);
+       set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
+}
+EXPORT_SYMBOL(ieee80211_stop_queue);
+
+void ieee80211_start_queues(struct ieee80211_hw *hw)
+{
+       struct ieee80211_local *local = hw_to_local(hw);
+       int i;
+
+       for (i = 0; i < local->hw.queues; i++)
+               clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
+       if (!ieee80211_qdisc_installed(local->mdev))
+               netif_start_queue(local->mdev);
+}
+EXPORT_SYMBOL(ieee80211_start_queues);
+
+void ieee80211_stop_queues(struct ieee80211_hw *hw)
+{
+       int i;
+
+       for (i = 0; i < hw->queues; i++)
+               ieee80211_stop_queue(hw, i);
+}
+EXPORT_SYMBOL(ieee80211_stop_queues);
+
+void ieee80211_wake_queues(struct ieee80211_hw *hw)
+{
+       int i;
+
+       for (i = 0; i < hw->queues; i++)
+               ieee80211_wake_queue(hw, i);
+}
+EXPORT_SYMBOL(ieee80211_wake_queues);