/* * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc * Copyright 2007 Johannes Berg * * 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 #include #include #include #include #include #include #include #include #include #include #include #include "ieee80211_i.h" #include "rate.h" #include "mesh.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[] __aligned(2) = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ const unsigned char bridge_tunnel_header[] __aligned(2) = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy) { struct ieee80211_local *local; BUG_ON(!wiphy); local = wiphy_priv(wiphy); return &local->hw; } EXPORT_SYMBOL(wiphy_to_ieee80211_hw); u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len, enum nl80211_iftype type) { __le16 fc = hdr->frame_control; /* drop ACK/CTS frames and incorrect hdr len (ctrl) */ if (len < 16) return NULL; if (ieee80211_is_data(fc)) { if (len < 24) /* drop incorrect hdr len (data) */ return NULL; if (ieee80211_has_a4(fc)) return NULL; if (ieee80211_has_tods(fc)) return hdr->addr1; if (ieee80211_has_fromds(fc)) return hdr->addr2; return hdr->addr3; } if (ieee80211_is_mgmt(fc)) { if (len < 24) /* drop incorrect hdr len (mgmt) */ return NULL; return hdr->addr3; } if (ieee80211_is_ctl(fc)) { if(ieee80211_is_pspoll(fc)) return hdr->addr1; if (ieee80211_is_back_req(fc)) { switch (type) { case NL80211_IFTYPE_STATION: return hdr->addr2; case NL80211_IFTYPE_AP: case NL80211_IFTYPE_AP_VLAN: return hdr->addr1; default: break; /* fall through to the return */ } } } return NULL; } unsigned int ieee80211_hdrlen(__le16 fc) { unsigned int hdrlen = 24; if (ieee80211_is_data(fc)) { if (ieee80211_has_a4(fc)) hdrlen = 30; if (ieee80211_is_data_qos(fc)) hdrlen += IEEE80211_QOS_CTL_LEN; goto out; } if (ieee80211_is_ctl(fc)) { /* * 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 & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) hdrlen = 10; else hdrlen = 16; } out: return hdrlen; } EXPORT_SYMBOL(ieee80211_hdrlen); unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) { const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data; unsigned int hdrlen; if (unlikely(skb->len < 10)) return 0; hdrlen = ieee80211_hdrlen(hdr->frame_control); if (unlikely(hdrlen > skb->len)) return 0; return hdrlen; } EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) { int ae = meshhdr->flags & IEEE80211S_FLAGS_AE; /* 7.1.3.5a.2 */ switch (ae) { case 0: return 6; case 1: return 12; case 2: return 18; case 3: return 24; default: return 6; } } void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx) { struct sk_buff *skb = tx->skb; struct ieee80211_hdr *hdr; do { hdr = (struct ieee80211_hdr *) skb->data; hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); } while ((skb = skb->next)); } 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.channel->band == IEEE80211_BAND_5GHZ || 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, struct ieee80211_vif *vif, size_t frame_len, struct ieee80211_rate *rate) { struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_sub_if_data *sdata; u16 dur; int erp; bool short_preamble = false; erp = 0; if (vif) { sdata = vif_to_sdata(vif); short_preamble = sdata->vif.bss_conf.use_short_preamble; if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) erp = rate->flags & IEEE80211_RATE_ERP_G; } dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp, short_preamble); return cpu_to_le16(dur); } EXPORT_SYMBOL(ieee80211_generic_frame_duration); __le16 ieee80211_rts_duration(struct ieee80211_hw *hw, struct ieee80211_vif *vif, size_t frame_len, const struct ieee80211_tx_info *frame_txctl) { struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_rate *rate; struct ieee80211_sub_if_data *sdata; bool short_preamble; int erp; u16 dur; struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; short_preamble = false; rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx]; erp = 0; if (vif) { sdata = vif_to_sdata(vif); short_preamble = sdata->vif.bss_conf.use_short_preamble; if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) erp = rate->flags & IEEE80211_RATE_ERP_G; } /* CTS duration */ dur = ieee80211_frame_duration(local, 10, rate->bitrate, erp, short_preamble); /* Data frame duration */ dur += ieee80211_frame_duration(local, frame_len, rate->bitrate, erp, short_preamble); /* ACK duration */ dur += ieee80211_frame_duration(local, 10, rate->bitrate, erp, short_preamble); return cpu_to_le16(dur); } EXPORT_SYMBOL(ieee80211_rts_duration); __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, struct ieee80211_vif *vif, size_t frame_len, const struct ieee80211_tx_info *frame_txctl) { struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_rate *rate; struct ieee80211_sub_if_data *sdata; bool short_preamble; int erp; u16 dur; struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; short_preamble = false; rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx]; erp = 0; if (vif) { sdata = vif_to_sdata(vif); short_preamble = sdata->vif.bss_conf.use_short_preamble; if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) erp = rate->flags & IEEE80211_RATE_ERP_G; } /* Data frame duration */ dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp, short_preamble); if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) { /* ACK duration */ dur += ieee80211_frame_duration(local, 10, rate->bitrate, erp, short_preamble); } return cpu_to_le16(dur); } EXPORT_SYMBOL(ieee80211_ctstoself_duration); static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue, enum queue_stop_reason reason) { struct ieee80211_local *local = hw_to_local(hw); if (WARN_ON(queue >= hw->queues)) return; __clear_bit(reason, &local->queue_stop_reasons[queue]); if (!skb_queue_empty(&local->pending[queue]) && local->queue_stop_reasons[queue] == BIT(IEEE80211_QUEUE_STOP_REASON_PENDING)) tasklet_schedule(&local->tx_pending_tasklet); if (local->queue_stop_reasons[queue] != 0) /* someone still has this queue stopped */ return; netif_wake_subqueue(local->mdev, queue); } void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue, enum queue_stop_reason reason) { struct ieee80211_local *local = hw_to_local(hw); unsigned long flags; spin_lock_irqsave(&local->queue_stop_reason_lock, flags); __ieee80211_wake_queue(hw, queue, reason); spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); } void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue) { ieee80211_wake_queue_by_reason(hw, queue, IEEE80211_QUEUE_STOP_REASON_DRIVER); } EXPORT_SYMBOL(ieee80211_wake_queue); static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue, enum queue_stop_reason reason) { struct ieee80211_local *local = hw_to_local(hw); if (WARN_ON(queue >= hw->queues)) return; /* * Only stop if it was previously running, this is necessary * for correct pending packets handling because there we may * start (but not wake) the queue and rely on that. */ if (!local->queue_stop_reasons[queue]) netif_stop_subqueue(local->mdev, queue); __set_bit(reason, &local->queue_stop_reasons[queue]); } void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue, enum queue_stop_reason reason) { struct ieee80211_local *local = hw_to_local(hw); unsigned long flags; spin_lock_irqsave(&local->queue_stop_reason_lock, flags); __ieee80211_stop_queue(hw, queue, reason); spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); } void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue) { ieee80211_stop_queue_by_reason(hw, queue, IEEE80211_QUEUE_STOP_REASON_DRIVER); } EXPORT_SYMBOL(ieee80211_stop_queue); void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw, enum queue_stop_reason reason) { struct ieee80211_local *local = hw_to_local(hw); unsigned long flags; int i; spin_lock_irqsave(&local->queue_stop_reason_lock, flags); for (i = 0; i < hw->queues; i++) __ieee80211_stop_queue(hw, i, reason); spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); } void ieee80211_stop_queues(struct ieee80211_hw *hw) { ieee80211_stop_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER); } EXPORT_SYMBOL(ieee80211_stop_queues); int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue) { struct ieee80211_local *local = hw_to_local(hw); if (WARN_ON(queue >= hw->queues)) return true; return __netif_subqueue_stopped(local->mdev, queue); } EXPORT_SYMBOL(ieee80211_queue_stopped); void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw, enum queue_stop_reason reason) { struct ieee80211_local *local = hw_to_local(hw); unsigned long flags; int i; spin_lock_irqsave(&local->queue_stop_reason_lock, flags); for (i = 0; i < hw->queues; i++) __ieee80211_wake_queue(hw, i, reason); spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); } void ieee80211_wake_queues(struct ieee80211_hw *hw) { ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER); } EXPORT_SYMBOL(ieee80211_wake_queues); void ieee80211_iterate_active_interfaces( struct ieee80211_hw *hw, void (*iterator)(void *data, u8 *mac, struct ieee80211_vif *vif), void *data) { struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_sub_if_data *sdata; mutex_lock(&local->iflist_mtx); list_for_each_entry(sdata, &local->interfaces, list) { switch (sdata->vif.type) { case __NL80211_IFTYPE_AFTER_LAST: case NL80211_IFTYPE_UNSPECIFIED: case NL80211_IFTYPE_MONITOR: case NL80211_IFTYPE_AP_VLAN: continue; case NL80211_IFTYPE_AP: case NL80211_IFTYPE_STATION: case NL80211_IFTYPE_ADHOC: case NL80211_IFTYPE_WDS: case NL80211_IFTYPE_MESH_POINT: break; } if (netif_running(sdata->dev)) iterator(data, sdata->dev->dev_addr, &sdata->vif); } mutex_unlock(&local->iflist_mtx); } EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces); void ieee80211_iterate_active_interfaces_atomic( struct ieee80211_hw *hw, void (*iterator)(void *data, u8 *mac, struct ieee80211_vif *vif), 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->vif.type) { case __NL80211_IFTYPE_AFTER_LAST: case NL80211_IFTYPE_UNSPECIFIED: case NL80211_IFTYPE_MONITOR: case NL80211_IFTYPE_AP_VLAN: continue; case NL80211_IFTYPE_AP: case NL80211_IFTYPE_STATION: case NL80211_IFTYPE_ADHOC: case NL80211_IFTYPE_WDS: case NL80211_IFTYPE_MESH_POINT: break; } if (netif_running(sdata->dev)) iterator(data, sdata->dev->dev_addr, &sdata->vif); } rcu_read_unlock(); } EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic); void ieee802_11_parse_elems(u8 *start, size_t len, struct ieee802_11_elems *elems) { size_t left = len; u8 *pos = start; memset(elems, 0, sizeof(*elems)); elems->ie_start = start; elems->total_len = len; while (left >= 2) { u8 id, elen; id = *pos++; elen = *pos++; left -= 2; if (elen > left) return; switch (id) { case WLAN_EID_SSID: elems->ssid = pos; elems->ssid_len = elen; break; case WLAN_EID_SUPP_RATES: elems->supp_rates = pos; elems->supp_rates_len = elen; break; case WLAN_EID_FH_PARAMS: elems->fh_params = pos; elems->fh_params_len = elen; break; case WLAN_EID_DS_PARAMS: elems->ds_params = pos; elems->ds_params_len = elen; break; case WLAN_EID_CF_PARAMS: elems->cf_params = pos; elems->cf_params_len = elen; break; case WLAN_EID_TIM: elems->tim = pos; elems->tim_len = elen; break; case WLAN_EID_IBSS_PARAMS: elems->ibss_params = pos; elems->ibss_params_len = elen; break; case WLAN_EID_CHALLENGE: elems->challenge = pos; elems->challenge_len = elen; break; case WLAN_EID_WPA: if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 && pos[2] == 0xf2) { /* Microsoft OUI (00:50:F2) */ if (pos[3] == 1) { /* OUI Type 1 - WPA IE */ elems->wpa = pos; elems->wpa_len = elen; } else if (elen >= 5 && pos[3] == 2) { if (pos[4] == 0) { elems->wmm_info = pos; elems->wmm_info_len = elen; } else if (pos[4] == 1) { elems->wmm_param = pos; elems->wmm_param_len = elen; } } } break; case WLAN_EID_RSN: elems->rsn = pos; elems->rsn_len = elen; break; case WLAN_EID_ERP_INFO: elems->erp_info = pos; elems->erp_info_len = elen; break; case WLAN_EID_EXT_SUPP_RATES: elems->ext_supp_rates = pos; elems->ext_supp_rates_len = elen; break; case WLAN_EID_HT_CAPABILITY: if (elen >= sizeof(struct ieee80211_ht_cap)) elems->ht_cap_elem = (void *)pos; break; case WLAN_EID_HT_INFORMATION: if (elen >= sizeof(struct ieee80211_ht_info)) elems->ht_info_elem = (void *)pos; break; case WLAN_EID_MESH_ID: elems->mesh_id = pos; elems->mesh_id_len = elen; break; case WLAN_EID_MESH_CONFIG: elems->mesh_config = pos; elems->mesh_config_len = elen; break; case WLAN_EID_PEER_LINK: elems->peer_link = pos; elems->peer_link_len = elen; break; case WLAN_EID_PREQ: elems->preq = pos; elems->preq_len = elen; break; case WLAN_EID_PREP: elems->prep = pos; elems->prep_len = elen; break; case WLAN_EID_PERR: elems->perr = pos; elems->perr_len = elen; break; case WLAN_EID_CHANNEL_SWITCH: elems->ch_switch_elem = pos; elems->ch_switch_elem_len = elen; break; case WLAN_EID_QUIET: if (!elems->quiet_elem) { elems->quiet_elem = pos; elems->quiet_elem_len = elen; } elems->num_of_quiet_elem++; break; case WLAN_EID_COUNTRY: elems->country_elem = pos; elems->country_elem_len = elen; break; case WLAN_EID_PWR_CONSTRAINT: elems->pwr_constr_elem = pos; elems->pwr_constr_elem_len = elen; break; case WLAN_EID_TIMEOUT_INTERVAL: elems->timeout_int = pos; elems->timeout_int_len = elen; break; default: break; } left -= elen; pos += elen; } } void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; struct ieee80211_tx_queue_params qparam; int i; if (!local->ops->conf_tx) return; memset(&qparam, 0, sizeof(qparam)); qparam.aifs = 2; if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)) qparam.cw_min = 31; else qparam.cw_min = 15; qparam.cw_max = 1023; qparam.txop = 0; for (i = 0; i < local_to_hw(local)->queues; i++) local->ops->conf_tx(local_to_hw(local), i, &qparam); } void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata, const size_t supp_rates_len, const u8 *supp_rates) { struct ieee80211_local *local = sdata->local; int i, have_higher_than_11mbit = 0; /* cf. IEEE 802.11 9.2.12 */ for (i = 0; i < supp_rates_len; i++) if ((supp_rates[i] & 0x7f) * 5 > 110) have_higher_than_11mbit = 1; if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && have_higher_than_11mbit) sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; else sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; ieee80211_set_wmm_default(sdata); } void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, int encrypt) { skb->dev = sdata->local->mdev; skb_set_mac_header(skb, 0); skb_set_network_header(skb, 0); skb_set_transport_header(skb, 0); skb->iif = sdata->dev->ifindex; skb->do_not_encrypt = !encrypt; dev_queue_xmit(skb); } int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz) { int ret = -EINVAL; struct ieee80211_channel *chan; struct ieee80211_local *local = sdata->local; chan = ieee80211_get_channel(local->hw.wiphy, freqMHz); if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) { if (sdata->vif.type == NL80211_IFTYPE_ADHOC && chan->flags & IEEE80211_CHAN_NO_IBSS) return ret; local->oper_channel = chan; local->oper_channel_type = NL80211_CHAN_NO_HT; if (local->sw_scanning || local->hw_scanning) ret = 0; else ret = ieee80211_hw_config( local, IEEE80211_CONF_CHANGE_CHANNEL); } return ret; } u32 ieee80211_mandatory_rates(struct ieee80211_local *local, enum ieee80211_band band) { struct ieee80211_supported_band *sband; struct ieee80211_rate *bitrates; u32 mandatory_rates; enum ieee80211_rate_flags mandatory_flag; int i; sband = local->hw.wiphy->bands[band]; if (!sband) { WARN_ON(1); sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; } if (band == IEEE80211_BAND_2GHZ) mandatory_flag = IEEE80211_RATE_MANDATORY_B; else mandatory_flag = IEEE80211_RATE_MANDATORY_A; bitrates = sband->bitrates; mandatory_rates = 0; for (i = 0; i < sband->n_bitrates; i++) if (bitrates[i].flags & mandatory_flag) mandatory_rates |= BIT(i); return mandatory_rates; } void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, u16 transaction, u16 auth_alg, u8 *extra, size_t extra_len, const u8 *bssid, int encrypt) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 6 + extra_len); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for auth " "frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6); memset(mgmt, 0, 24 + 6); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_AUTH); if (encrypt) mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); memcpy(mgmt->da, bssid, ETH_ALEN); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); memcpy(mgmt->bssid, bssid, ETH_ALEN); mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg); mgmt->u.auth.auth_transaction = cpu_to_le16(transaction); mgmt->u.auth.status_code = cpu_to_le16(0); if (extra) memcpy(skb_put(skb, extra_len), extra, extra_len); ieee80211_tx_skb(sdata, skb, encrypt); } void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, u8 *ssid, size_t ssid_len, u8 *ie, size_t ie_len) { struct ieee80211_local *local = sdata->local; struct ieee80211_supported_band *sband; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; u8 *pos, *supp_rates, *esupp_rates = NULL; int i; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 + ie_len); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer for probe " "request\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_REQ); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); if (dst) { memcpy(mgmt->da, dst, ETH_ALEN); memcpy(mgmt->bssid, dst, ETH_ALEN); } else { memset(mgmt->da, 0xff, ETH_ALEN); memset(mgmt->bssid, 0xff, ETH_ALEN); } pos = skb_put(skb, 2 + ssid_len); *pos++ = WLAN_EID_SSID; *pos++ = ssid_len; memcpy(pos, ssid, ssid_len); supp_rates = skb_put(skb, 2); supp_rates[0] = WLAN_EID_SUPP_RATES; supp_rates[1] = 0; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; for (i = 0; i < sband->n_bitrates; i++) { struct ieee80211_rate *rate = &sband->bitrates[i]; if (esupp_rates) { pos = skb_put(skb, 1); esupp_rates[1]++; } else if (supp_rates[1] == 8) { esupp_rates = skb_put(skb, 3); esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES; esupp_rates[1] = 1; pos = &esupp_rates[2]; } else { pos = skb_put(skb, 1); supp_rates[1]++; } *pos = rate->bitrate / 5; } /* if adding more here, adjust max_scan_ie_len */ if (ie) memcpy(skb_put(skb, ie_len), ie, ie_len); ieee80211_tx_skb(sdata, skb, 0); } u32 ieee80211_sta_get_rates(struct ieee80211_local *local, struct ieee802_11_elems *elems, enum ieee80211_band band) { struct ieee80211_supported_band *sband; struct ieee80211_rate *bitrates; size_t num_rates; u32 supp_rates; int i, j; sband = local->hw.wiphy->bands[band]; if (!sband) { WARN_ON(1); sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; } bitrates = sband->bitrates; num_rates = sband->n_bitrates; supp_rates = 0; for (i = 0; i < elems->supp_rates_len + elems->ext_supp_rates_len; i++) { u8 rate = 0; int own_rate; if (i < elems->supp_rates_len) rate = elems->supp_rates[i]; else if (elems->ext_supp_rates) rate = elems->ext_supp_rates [i - elems->supp_rates_len]; own_rate = 5 * (rate & 0x7f); for (j = 0; j < num_rates; j++) if (bitrates[j].bitrate == own_rate) supp_rates |= BIT(j); } return supp_rates; }