diff options
| -rw-r--r-- | net/mac80211/Makefile | 1 | ||||
| -rw-r--r-- | net/mac80211/ieee80211.c | 437 | ||||
| -rw-r--r-- | net/mac80211/ieee80211_i.h | 18 | ||||
| -rw-r--r-- | net/mac80211/util.c | 463 |
4 files changed, 472 insertions, 447 deletions
diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile index d95de3f8a4b1..122b23eb15d1 100644 --- a/net/mac80211/Makefile +++ b/net/mac80211/Makefile @@ -21,4 +21,5 @@ mac80211-objs := \ rx.o \ tx.o \ key.o \ + util.o \ $(mac80211-objs-y) diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c index f240f9706081..1981058907b7 100644 --- a/net/mac80211/ieee80211.c +++ b/net/mac80211/ieee80211.c @@ -34,23 +34,6 @@ #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; diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index 28414b3e0c34..ed00552b3418 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -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 index 000000000000..c45658309472 --- /dev/null +++ b/net/mac80211/util.c @@ -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); |