| /* |
| * 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/net_namespace.h> |
| #include <net/cfg80211.h> |
| #include <net/rtnetlink.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 }; |
| |
| |
| 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_IEEE80211G: |
| if (rate->rate == 10 || rate->rate == 20 || |
| rate->rate == 55 || rate->rate == 110) |
| rate->flags |= IEEE80211_RATE_BASIC; |
| break; |
| case NUM_IEEE80211_MODES: |
| /* not useful */ |
| 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_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; |
| case NUM_IEEE80211_MODES: |
| /* not useful */ |
| 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, |
| enum ieee80211_if_types type) |
| { |
| u16 fc; |
| |
| /* drop ACK/CTS frames and incorrect hdr len (ctrl) */ |
| if (len < 16) |
| return NULL; |
| |
| fc = le16_to_cpu(hdr->frame_control); |
| |
| switch (fc & IEEE80211_FCTL_FTYPE) { |
| case IEEE80211_FTYPE_DATA: |
| if (len < 24) /* drop incorrect hdr len (data) */ |
| return NULL; |
| 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: |
| if (len < 24) /* drop incorrect hdr len (mgmt) */ |
| return NULL; |
| return hdr->addr3; |
| case IEEE80211_FTYPE_CTL: |
| if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL) |
| return hdr->addr1; |
| else if ((fc & IEEE80211_FCTL_STYPE) == |
| IEEE80211_STYPE_BACK_REQ) { |
| switch (type) { |
| case IEEE80211_IF_TYPE_STA: |
| return hdr->addr2; |
| case IEEE80211_IF_TYPE_AP: |
| case IEEE80211_IF_TYPE_VLAN: |
| return hdr->addr1; |
| default: |
| return NULL; |
| } |
| } |
| 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); |
| |
| 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) { |
| /* |
| * 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 |
| */ |
| 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, int if_id, |
| size_t frame_len, int rate) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct net_device *bdev = dev_get_by_index(&init_net, if_id); |
| struct ieee80211_sub_if_data *sdata; |
| u16 dur; |
| int erp; |
| |
| if (unlikely(!bdev)) |
| return 0; |
| |
| sdata = IEEE80211_DEV_TO_SUB_IF(bdev); |
| erp = ieee80211_is_erp_rate(hw->conf.phymode, rate); |
| dur = ieee80211_frame_duration(local, frame_len, rate, |
| erp, sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE); |
| |
| dev_put(bdev); |
| return cpu_to_le16(dur); |
| } |
| EXPORT_SYMBOL(ieee80211_generic_frame_duration); |
| |
| __le16 ieee80211_rts_duration(struct ieee80211_hw *hw, int if_id, |
| size_t frame_len, |
| const struct ieee80211_tx_control *frame_txctl) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_rate *rate; |
| struct net_device *bdev = dev_get_by_index(&init_net, if_id); |
| struct ieee80211_sub_if_data *sdata; |
| int short_preamble; |
| int erp; |
| u16 dur; |
| |
| if (unlikely(!bdev)) |
| return 0; |
| |
| sdata = IEEE80211_DEV_TO_SUB_IF(bdev); |
| short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE; |
| |
| 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); |
| |
| dev_put(bdev); |
| return cpu_to_le16(dur); |
| } |
| EXPORT_SYMBOL(ieee80211_rts_duration); |
| |
| __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, int if_id, |
| size_t frame_len, |
| const struct ieee80211_tx_control *frame_txctl) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_rate *rate; |
| struct net_device *bdev = dev_get_by_index(&init_net, if_id); |
| struct ieee80211_sub_if_data *sdata; |
| int short_preamble; |
| int erp; |
| u16 dur; |
| |
| if (unlikely(!bdev)) |
| return 0; |
| |
| sdata = IEEE80211_DEV_TO_SUB_IF(bdev); |
| short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE; |
| |
| 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); |
| } |
| |
| dev_put(bdev); |
| 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); |
| |
| void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw, |
| void (*iterator)(void *data, u8 *mac, |
| int if_id), |
| void *data) |
| { |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_sub_if_data *sdata; |
| |
| rcu_read_lock(); |
| |
| list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
| switch (sdata->type) { |
| case IEEE80211_IF_TYPE_INVALID: |
| case IEEE80211_IF_TYPE_MNTR: |
| case IEEE80211_IF_TYPE_VLAN: |
| continue; |
| case IEEE80211_IF_TYPE_AP: |
| case IEEE80211_IF_TYPE_STA: |
| case IEEE80211_IF_TYPE_IBSS: |
| case IEEE80211_IF_TYPE_WDS: |
| break; |
| } |
| if (sdata->dev == local->mdev) |
| continue; |
| if (netif_running(sdata->dev)) |
| iterator(data, sdata->dev->dev_addr, |
| sdata->dev->ifindex); |
| } |
| |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces); |