ieee80211_sub_if_data/ieee80211_vif 包含每個虛擬接口信息 ieee80211_vifis passed to driver for those virtual interfaces the driver knowsabout (no monitor,VLAN) 包含的sub-structures取決于模式
struct ieee80211_vif {enum nl80211_iftype type;struct ieee80211_bss_conf bss_conf;u8 addr[ETH_ALEN];bool p2p;bool csa_active;u8 cab_queue;u8 hw_queue[IEEE80211_NUM_ACS];struct ieee80211_chanctx_conf __rcu *chanctx_conf;u32 driver_flags;#ifdef CPTCFG_MAC80211_DEBUGFSstruct dentry *debugfs_dir;
#endif/* must be last */u8 drv_priv[0] __aligned(sizeof(void *));
};
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main.c mac80211的main.c，module入口文件
#include <net/mac80211.h>
#include <linux/module.h>
#include <linux/init.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/rtnetlink.h>
#include <linux/bitmap.h>
#include <linux/pm_qos.h>
#include <linux/inetdevice.h>
#include <net/net_namespace.h>
#include <net/cfg80211.h>
#include <net/addrconf.h>#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "mesh.h"
#include "wep.h"
#include "led.h"
#include "cfg.h"
#include "debugfs.h"void ieee80211_configure_filter(struct ieee80211_local *local)
{u64 mc;unsigned int changed_flags;unsigned int new_flags = 0;if (atomic_read(&local->iff_promiscs))new_flags |= FIF_PROMISC_IN_BSS;if (atomic_read(&local->iff_allmultis))new_flags |= FIF_ALLMULTI;if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))new_flags |= FIF_BCN_PRBRESP_PROMISC;if (local->fif_probe_req || local->probe_req_reg)new_flags |= FIF_PROBE_REQ;if (local->fif_fcsfail)new_flags |= FIF_FCSFAIL;if (local->fif_plcpfail)new_flags |= FIF_PLCPFAIL;if (local->fif_control)new_flags |= FIF_CONTROL;if (local->fif_other_bss)new_flags |= FIF_OTHER_BSS;if (local->fif_pspoll)new_flags |= FIF_PSPOLL;spin_lock_bh(&local->filter_lock);changed_flags = local->filter_flags ^ new_flags;mc = drv_prepare_multicast(local, &local->mc_list);spin_unlock_bh(&local->filter_lock);/* be a bit nasty */new_flags |= (1<<31);drv_configure_filter(local, changed_flags, &new_flags, mc);WARN_ON(new_flags & (1<<31));local->filter_flags = new_flags & ~(1<<31);
}static void ieee80211_reconfig_filter(struct work_struct *work)
{struct ieee80211_local *local =container_of(work, struct ieee80211_local, reconfig_filter);ieee80211_configure_filter(local);
}static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
{struct ieee80211_sub_if_data *sdata;struct cfg80211_chan_def chandef = {};u32 changed = 0;int power;u32 offchannel_flag;offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;if (local->scan_chandef.chan) {chandef = local->scan_chandef;} else if (local->tmp_channel) {chandef.chan = local->tmp_channel;chandef.width = NL80211_CHAN_WIDTH_20_NOHT;chandef.center_freq1 = chandef.chan->center_freq;} elsechandef = local->_oper_chandef;WARN(!cfg80211_chandef_valid(&chandef),"control:%d MHz width:%d center: %d/%d MHz",chandef.chan->center_freq, chandef.width,chandef.center_freq1, chandef.center_freq2);if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;elselocal->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;if (offchannel_flag ||!cfg80211_chandef_identical(&local->hw.conf.chandef,&local->_oper_chandef)) {local->hw.conf.chandef = chandef;changed |= IEEE80211_CONF_CHANGE_CHANNEL;}if (!conf_is_ht(&local->hw.conf)) {/** mac80211.h documents that this is only valid* when the channel is set to an HT type, and* that otherwise STATIC is used.*/local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;} else if (local->hw.conf.smps_mode != local->smps_mode) {local->hw.conf.smps_mode = local->smps_mode;changed |= IEEE80211_CONF_CHANGE_SMPS;}power = ieee80211_chandef_max_power(&chandef);rcu_read_lock();list_for_each_entry_rcu(sdata, &local->interfaces, list) {if (!rcu_access_pointer(sdata->vif.chanctx_conf))continue;if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)continue;power = min(power, sdata->vif.bss_conf.txpower);}rcu_read_unlock();if (local->hw.conf.power_level != power) {changed |= IEEE80211_CONF_CHANGE_POWER;local->hw.conf.power_level = power;}return changed;
}int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
{int ret = 0;might_sleep();if (!local->use_chanctx)changed |= ieee80211_hw_conf_chan(local);elsechanged &= ~(IEEE80211_CONF_CHANGE_CHANNEL |IEEE80211_CONF_CHANGE_POWER);if (changed && local->open_count) {ret = drv_config(local, changed);/** Goal:* HW reconfiguration should never fail, the driver has told* us what it can support so it should live up to that promise.** Current status:* rfkill is not integrated with mac80211 and a* configuration command can thus fail if hardware rfkill* is enabled** FIXME: integrate rfkill with mac80211 and then add this* WARN_ON() back**//* WARN_ON(ret); */}return ret;
}void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,u32 changed)
{struct ieee80211_local *local = sdata->local;if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)return;drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
}u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
{sdata->vif.bss_conf.use_cts_prot = false;sdata->vif.bss_conf.use_short_preamble = false;sdata->vif.bss_conf.use_short_slot = false;return BSS_CHANGED_ERP_CTS_PROT |BSS_CHANGED_ERP_PREAMBLE |BSS_CHANGED_ERP_SLOT;
}static void ieee80211_tasklet_handler(unsigned long data)
{struct ieee80211_local *local = (struct ieee80211_local *) data;struct sk_buff *skb;while ((skb = skb_dequeue(&local->skb_queue)) ||(skb = skb_dequeue(&local->skb_queue_unreliable))) {switch (skb->pkt_type) {case IEEE80211_RX_MSG:/* Clear skb->pkt_type in order to not confuse kernel* netstack. */skb->pkt_type = 0;ieee80211_rx(&local->hw, skb);break;case IEEE80211_TX_STATUS_MSG:skb->pkt_type = 0;ieee80211_tx_status(&local->hw, skb);break;default:WARN(1, "mac80211: Packet is of unknown type %d\n",skb->pkt_type);dev_kfree_skb(skb);break;}}
}static void ieee80211_restart_work(struct work_struct *work)
{struct ieee80211_local *local =container_of(work, struct ieee80211_local, restart_work);/* wait for scan work complete */flush_workqueue(local->workqueue);WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),"%s called with hardware scan in progress\n", __func__);rtnl_lock();ieee80211_scan_cancel(local);ieee80211_reconfig(local);rtnl_unlock();
}void ieee80211_restart_hw(struct ieee80211_hw *hw)
{struct ieee80211_local *local = hw_to_local(hw);trace_api_restart_hw(local);wiphy_info(hw->wiphy,"Hardware restart was requested\n");/* use this reason, ieee80211_reconfig will unblock it */ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,IEEE80211_QUEUE_STOP_REASON_SUSPEND);/** Stop all Rx during the reconfig. We don't want state changes* or driver callbacks while this is in progress.*/local->in_reconfig = true;barrier();schedule_work(&local->restart_work);
}
EXPORT_SYMBOL(ieee80211_restart_hw);#ifdef CONFIG_INET
static int ieee80211_ifa_changed(struct notifier_block *nb,unsigned long data, void *arg)
{struct in_ifaddr *ifa = arg;struct ieee80211_local *local =container_of(nb, struct ieee80211_local,ifa_notifier);struct net_device *ndev = ifa->ifa_dev->dev;struct wireless_dev *wdev = ndev->ieee80211_ptr;struct in_device *idev;struct ieee80211_sub_if_data *sdata;struct ieee80211_bss_conf *bss_conf;struct ieee80211_if_managed *ifmgd;int c = 0;/* Make sure it's our interface that got changed */if (!wdev)return NOTIFY_DONE;if (wdev->wiphy != local->hw.wiphy)return NOTIFY_DONE;sdata = IEEE80211_DEV_TO_SUB_IF(ndev);bss_conf = &sdata->vif.bss_conf;/* ARP filtering is only supported in managed mode */if (sdata->vif.type != NL80211_IFTYPE_STATION)return NOTIFY_DONE;idev = __in_dev_get_rtnl(sdata->dev);if (!idev)return NOTIFY_DONE;ifmgd = &sdata->u.mgd;sdata_lock(sdata);/* Copy the addresses to the bss_conf list */ifa = idev->ifa_list;while (ifa) {if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)bss_conf->arp_addr_list[c] = ifa->ifa_address;ifa = ifa->ifa_next;c++;}bss_conf->arp_addr_cnt = c;/* Configure driver only if associated (which also implies it is up) */if (ifmgd->associated)ieee80211_bss_info_change_notify(sdata,BSS_CHANGED_ARP_FILTER);sdata_unlock(sdata);return NOTIFY_OK;
}
#endif#if IS_ENABLED(CONFIG_IPV6)
static int ieee80211_ifa6_changed(struct notifier_block *nb,unsigned long data, void *arg)
{struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;struct inet6_dev *idev = ifa->idev;struct net_device *ndev = ifa->idev->dev;struct ieee80211_local *local =container_of(nb, struct ieee80211_local, ifa6_notifier);struct wireless_dev *wdev = ndev->ieee80211_ptr;struct ieee80211_sub_if_data *sdata;/* Make sure it's our interface that got changed */if (!wdev || wdev->wiphy != local->hw.wiphy)return NOTIFY_DONE;sdata = IEEE80211_DEV_TO_SUB_IF(ndev);/** For now only support station mode. This is mostly because* doing AP would have to handle AP_VLAN in some way ...*/if (sdata->vif.type != NL80211_IFTYPE_STATION)return NOTIFY_DONE;drv_ipv6_addr_change(local, sdata, idev);return NOTIFY_OK;
}
#endif/* There isn't a lot of sense in it, but you can transmit anything you like */
static const struct ieee80211_txrx_stypes
ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {[NL80211_IFTYPE_ADHOC] = {.tx = 0xffff,.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |BIT(IEEE80211_STYPE_AUTH >> 4) |BIT(IEEE80211_STYPE_DEAUTH >> 4) |BIT(IEEE80211_STYPE_PROBE_REQ >> 4),},[NL80211_IFTYPE_STATION] = {.tx = 0xffff,.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |BIT(IEEE80211_STYPE_PROBE_REQ >> 4),},[NL80211_IFTYPE_AP] = {.tx = 0xffff,.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |BIT(IEEE80211_STYPE_DISASSOC >> 4) |BIT(IEEE80211_STYPE_AUTH >> 4) |BIT(IEEE80211_STYPE_DEAUTH >> 4) |BIT(IEEE80211_STYPE_ACTION >> 4),},[NL80211_IFTYPE_AP_VLAN] = {/* copy AP */.tx = 0xffff,.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |BIT(IEEE80211_STYPE_DISASSOC >> 4) |BIT(IEEE80211_STYPE_AUTH >> 4) |BIT(IEEE80211_STYPE_DEAUTH >> 4) |BIT(IEEE80211_STYPE_ACTION >> 4),},[NL80211_IFTYPE_P2P_CLIENT] = {.tx = 0xffff,.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |BIT(IEEE80211_STYPE_PROBE_REQ >> 4),},[NL80211_IFTYPE_P2P_GO] = {.tx = 0xffff,.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |BIT(IEEE80211_STYPE_DISASSOC >> 4) |BIT(IEEE80211_STYPE_AUTH >> 4) |BIT(IEEE80211_STYPE_DEAUTH >> 4) |BIT(IEEE80211_STYPE_ACTION >> 4),},[NL80211_IFTYPE_MESH_POINT] = {.tx = 0xffff,.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |BIT(IEEE80211_STYPE_AUTH >> 4) |BIT(IEEE80211_STYPE_DEAUTH >> 4),},[NL80211_IFTYPE_P2P_DEVICE] = {.tx = 0xffff,.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |BIT(IEEE80211_STYPE_PROBE_REQ >> 4),},
};static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {.ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |IEEE80211_HT_AMPDU_PARM_DENSITY,.cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |IEEE80211_HT_CAP_MAX_AMSDU |IEEE80211_HT_CAP_SGI_20 |IEEE80211_HT_CAP_SGI_40 |IEEE80211_HT_CAP_LDPC_CODING |IEEE80211_HT_CAP_40MHZ_INTOLERANT),.mcs = {.rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, },},
};static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {.vht_cap_info =cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |IEEE80211_VHT_CAP_SHORT_GI_80 |IEEE80211_VHT_CAP_SHORT_GI_160 |IEEE80211_VHT_CAP_RXSTBC_1 |IEEE80211_VHT_CAP_RXSTBC_2 |IEEE80211_VHT_CAP_RXSTBC_3 |IEEE80211_VHT_CAP_RXSTBC_4 |IEEE80211_VHT_CAP_TXSTBC |IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),.supp_mcs = {.rx_mcs_map = cpu_to_le16(~0),.tx_mcs_map = cpu_to_le16(~0),},
};static const u8 extended_capabilities[] = {0, 0, 0, 0, 0, 0, 0,WLAN_EXT_CAPA8_OPMODE_NOTIF,
};
/* ieee80211_alloc_hw()
* 分配wiphy對象空間（保證私有數據和硬件私有數據32字節對齊，wiphy包含ieee80211_local和驅動私有數據）
* 初始化wiphy對象（包括重傳次數，RTS門限等等）
* 初始化ieee80211_local（包括重傳次數，工作隊列，接口鏈表等等）
* 初始化sta_pending_list鏈表
* 初始化sta_list鏈表
*
*/struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,const struct ieee80211_ops *ops)
{struct ieee80211_local *local;int priv_size, i;struct wiphy *wiphy;bool use_chanctx;if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||!ops->add_interface || !ops->remove_interface ||!ops->configure_filter))return NULL;if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))return NULL;/* check all or no channel context operations exist */i = !!ops->add_chanctx + !!ops->remove_chanctx +!!ops->change_chanctx + !!ops->assign_vif_chanctx +!!ops->unassign_vif_chanctx;if (WARN_ON(i != 0 && i != 5))return NULL;use_chanctx = i == 5;/* Ensure 32-byte alignment of our private data and hw private data.* We use the wiphy priv data for both our ieee80211_local and for* the driver's private data** In memory it'll be like this:** +-------------------------+* | struct wiphy |* +-------------------------+* | struct ieee80211_local |* +-------------------------+* | driver's private data |* +-------------------------+**/priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;wiphy = wiphy_new(&mac80211_config_ops, priv_size);if (!wiphy)return NULL;wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;wiphy->privid = mac80211_wiphy_privid;wiphy->flags |= WIPHY_FLAG_NETNS_OK |WIPHY_FLAG_4ADDR_AP |WIPHY_FLAG_4ADDR_STATION |WIPHY_FLAG_REPORTS_OBSS |WIPHY_FLAG_OFFCHAN_TX;wiphy->extended_capabilities = extended_capabilities;wiphy->extended_capabilities_mask = extended_capabilities;wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);if (ops->remain_on_channel)wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |NL80211_FEATURE_SAE |NL80211_FEATURE_HT_IBSS |NL80211_FEATURE_VIF_TXPOWER |NL80211_FEATURE_USERSPACE_MPM;if (!ops->hw_scan)wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |NL80211_FEATURE_AP_SCAN;if (!ops->set_key)wiphy->flags |= WIPHY_FLAG_IBSS_RSN;wiphy->bss_priv_size = sizeof(struct ieee80211_bss);local = wiphy_priv(wiphy);local->hw.wiphy = wiphy;local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);local->ops = ops;local->use_chanctx = use_chanctx;/* set up some defaults */local->hw.queues = 1;local->hw.max_rates = 1;local->hw.max_report_rates = 0;local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |IEEE80211_RADIOTAP_MCS_HAVE_GI |IEEE80211_RADIOTAP_MCS_HAVE_BW;local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;INIT_LIST_HEAD(&local->interfaces);__hw_addr_init(&local->mc_list);mutex_init(&local->iflist_mtx);mutex_init(&local->mtx);mutex_init(&local->key_mtx);spin_lock_init(&local->filter_lock);spin_lock_init(&local->rx_path_lock);spin_lock_init(&local->queue_stop_reason_lock);INIT_LIST_HEAD(&local->chanctx_list);mutex_init(&local->chanctx_mtx);INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);INIT_WORK(&local->restart_work, ieee80211_restart_work);INIT_WORK(&local->radar_detected_work,ieee80211_dfs_radar_detected_work);INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);local->smps_mode = IEEE80211_SMPS_OFF;INIT_WORK(&local->dynamic_ps_enable_work,ieee80211_dynamic_ps_enable_work);INIT_WORK(&local->dynamic_ps_disable_work,ieee80211_dynamic_ps_disable_work);setup_timer(&local->dynamic_ps_timer,ieee80211_dynamic_ps_timer, (unsigned long) local);INIT_WORK(&local->sched_scan_stopped_work,ieee80211_sched_scan_stopped_work);spin_lock_init(&local->ack_status_lock);idr_init(&local->ack_status_frames);sta_info_init(local);for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {skb_queue_head_init(&local->pending[i]);atomic_set(&local->agg_queue_stop[i], 0);}tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,(unsigned long)local);tasklet_init(&local->tasklet,ieee80211_tasklet_handler,(unsigned long) local);skb_queue_head_init(&local->skb_queue);skb_queue_head_init(&local->skb_queue_unreliable);ieee80211_led_names(local);ieee80211_roc_setup(local);return &local->hw;
}
EXPORT_SYMBOL(ieee80211_alloc_hw);static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
{bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||IS_ERR(local->wep_rx_tfm));bool have_mfp = local->hw.flags & IEEE80211_HW_MFP_CAPABLE;const struct ieee80211_cipher_scheme *cs = local->hw.cipher_schemes;int n_suites = 0, r = 0, w = 0;u32 *suites;static const u32 cipher_suites[] = {/* keep WEP first, it may be removed below */WLAN_CIPHER_SUITE_WEP40,WLAN_CIPHER_SUITE_WEP104,WLAN_CIPHER_SUITE_TKIP,WLAN_CIPHER_SUITE_CCMP,/* keep last -- depends on hw flags! */WLAN_CIPHER_SUITE_AES_CMAC};/* Driver specifies the ciphers, we have nothing to do... */if (local->hw.wiphy->cipher_suites && have_wep)return 0;/* Set up cipher suites if driver relies on mac80211 cipher defs */if (!local->hw.wiphy->cipher_suites && !cs) {local->hw.wiphy->cipher_suites = cipher_suites;local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);if (!have_mfp)local->hw.wiphy->n_cipher_suites--;if (!have_wep) {local->hw.wiphy->cipher_suites += 2;local->hw.wiphy->n_cipher_suites -= 2;}return 0;}if (!local->hw.wiphy->cipher_suites) {/** Driver specifies cipher schemes only* We start counting ciphers defined by schemes, TKIP and CCMP*/n_suites = local->hw.n_cipher_schemes + 2;/* check if we have WEP40 and WEP104 */if (have_wep)n_suites += 2;/* check if we have AES_CMAC */if (have_mfp)n_suites++;suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);if (!suites)return -ENOMEM;suites[w++] = WLAN_CIPHER_SUITE_CCMP;suites[w++] = WLAN_CIPHER_SUITE_TKIP;if (have_wep) {suites[w++] = WLAN_CIPHER_SUITE_WEP40;suites[w++] = WLAN_CIPHER_SUITE_WEP104;}if (have_mfp)suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;for (r = 0; r < local->hw.n_cipher_schemes; r++)suites[w++] = cs[r].cipher;} else {/* Driver provides cipher suites, but we need to exclude WEP */suites = kmemdup(local->hw.wiphy->cipher_suites,sizeof(u32) * local->hw.wiphy->n_cipher_suites,GFP_KERNEL);if (!suites)return -ENOMEM;for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {u32 suite = local->hw.wiphy->cipher_suites[r];if (suite == WLAN_CIPHER_SUITE_WEP40 ||suite == WLAN_CIPHER_SUITE_WEP104)continue;suites[w++] = suite;}}local->hw.wiphy->cipher_suites = suites;local->hw.wiphy->n_cipher_suites = w;local->wiphy_ciphers_allocated = true;return 0;
}
/*
* ieee80211_register_hw()
* 分配int_scan_req數據結構
* 初始化支持接口類型（包括MONITOR接口）
* 注冊wiphy
* 初始化WEP
* 初始化速率控制算法
* 注冊STA接口（默認wlan
*
*/int ieee80211_register_hw(struct ieee80211_hw *hw)
{struct ieee80211_local *local = hw_to_local(hw);int result, i;enum ieee80211_band band;int channels, max_bitrates;bool supp_ht, supp_vht;netdev_features_t feature_whitelist;struct cfg80211_chan_def dflt_chandef = {};if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&(local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||local->hw.offchannel_tx_hw_queue >= local->hw.queues))return -EINVAL;#ifdef CONFIG_PMif (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))return -EINVAL;
#endifif (!local->use_chanctx) {for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {const struct ieee80211_iface_combination *comb;comb = &local->hw.wiphy->iface_combinations[i];if (comb->num_different_channels > 1)return -EINVAL;}} else {/** WDS is currently prohibited when channel contexts are used* because there's no clear definition of which channel WDS* type interfaces use*/if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))return -EINVAL;/* DFS currently not supported with channel context drivers */for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {const struct ieee80211_iface_combination *comb;comb = &local->hw.wiphy->iface_combinations[i];if (comb->radar_detect_widths)return -EINVAL;}}/* Only HW csum features are currently compatible with mac80211 */feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |NETIF_F_HW_CSUM;if (WARN_ON(hw->netdev_features & ~feature_whitelist))return -EINVAL;if (hw->max_report_rates == 0)hw->max_report_rates = hw->max_rates;local->rx_chains = 1;/** generic code guarantees at least one band,* set this very early because much code assumes* that hw.conf.channel is assigned*/channels = 0;max_bitrates = 0;supp_ht = false;supp_vht = false;for (band = 0; band < IEEE80211_NUM_BANDS; band++) {struct ieee80211_supported_band *sband;sband = local->hw.wiphy->bands[band];if (!sband)continue;if (!dflt_chandef.chan) {cfg80211_chandef_create(&dflt_chandef,&sband->channels[0],NL80211_CHAN_NO_HT);/* init channel we're on */if (!local->use_chanctx && !local->_oper_chandef.chan) {local->hw.conf.chandef = dflt_chandef;local->_oper_chandef = dflt_chandef;}local->monitor_chandef = dflt_chandef;}channels += sband->n_channels;if (max_bitrates < sband->n_bitrates)max_bitrates = sband->n_bitrates;supp_ht = supp_ht || sband->ht_cap.ht_supported;supp_vht = supp_vht || sband->vht_cap.vht_supported;if (sband->ht_cap.ht_supported)local->rx_chains =max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),local->rx_chains);/* TODO: consider VHT for RX chains, hopefully it's the same */}/* if low-level driver supports AP, we also support VLAN */if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);}/* mac80211 always supports monitor */hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);/* mac80211 doesn't support more than one IBSS interface right now */for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {const struct ieee80211_iface_combination *c;int j;c = &hw->wiphy->iface_combinations[i];for (j = 0; j < c->n_limits; j++)if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&c->limits[j].max > 1)return -EINVAL;}local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +sizeof(void *) * channels, GFP_KERNEL);if (!local->int_scan_req)return -ENOMEM;for (band = 0; band < IEEE80211_NUM_BANDS; band++) {if (!local->hw.wiphy->bands[band])continue;local->int_scan_req->rates[band] = (u32) -1;}#ifndef CPTCFG_MAC80211_MESH/* mesh depends on Kconfig, but drivers should set it if they want */local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
#endif/* if the underlying driver supports mesh, mac80211 will (at least)* provide routing of mesh authentication frames to userspace */if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;/* mac80211 supports control port protocol changing */local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;} else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) {local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;if (hw->max_signal <= 0) {result = -EINVAL;goto fail_wiphy_register;}}WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)&& (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),"U-APSD not supported with HW_PS_NULLFUNC_STACK\n");/** Calculate scan IE length -- we need this to alloc* memory and to subtract from the driver limit. It* includes the DS Params, (extended) supported rates, and HT* information -- SSID is the driver's responsibility.*/local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +3 /* DS Params */;if (supp_ht)local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);if (supp_vht)local->scan_ies_len +=2 + sizeof(struct ieee80211_vht_cap);if (!local->ops->hw_scan) {/* For hw_scan, driver needs to set these up. */local->hw.wiphy->max_scan_ssids = 4;local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;}/** If the driver supports any scan IEs, then assume the* limit includes the IEs mac80211 will add, otherwise* leave it at zero and let the driver sort it out; we* still pass our IEs to the driver but userspace will* not be allowed to in that case.*/if (local->hw.wiphy->max_scan_ie_len)local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,local->hw.n_cipher_schemes));result = ieee80211_init_cipher_suites(local);if (result < 0)goto fail_wiphy_register;if (!local->ops->remain_on_channel)local->hw.wiphy->max_remain_on_channel_duration = 5000;/* mac80211 based drivers don't support internal TDLS setup */if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;result = wiphy_register(local->hw.wiphy);if (result < 0)goto fail_wiphy_register;/** We use the number of queues for feature tests (QoS, HT) internally* so restrict them appropriately.*/if (hw->queues > IEEE80211_MAX_QUEUES)hw->queues = IEEE80211_MAX_QUEUES;local->workqueue =alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));if (!local->workqueue) {result = -ENOMEM;goto fail_workqueue;}/** The hardware needs headroom for sending the frame,* and we need some headroom for passing the frame to monitor* interfaces, but never both at the same time.*/local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,IEEE80211_TX_STATUS_HEADROOM);debugfs_hw_add(local);/** if the driver doesn't specify a max listen interval we* use 5 which should be a safe default*/if (local->hw.max_listen_interval == 0)local->hw.max_listen_interval = 5;local->hw.conf.listen_interval = local->hw.max_listen_interval;local->dynamic_ps_forced_timeout = -1;result = ieee80211_wep_init(local);if (result < 0)wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",result);local->hw.conf.flags = IEEE80211_CONF_IDLE;ieee80211_led_init(local);rtnl_lock();result = ieee80211_init_rate_ctrl_alg(local,hw->rate_control_algorithm);if (result < 0) {wiphy_debug(local->hw.wiphy,"Failed to initialize rate control algorithm\n");goto fail_rate;}/* add one default STA interface if supported */if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {result = ieee80211_if_add(local, "wlan%d", NULL,NL80211_IFTYPE_STATION, NULL);if (result)wiphy_warn(local->hw.wiphy,"Failed to add default virtual iface\n");}rtnl_unlock();local->network_latency_notifier.notifier_call =ieee80211_max_network_latency;result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,&local->network_latency_notifier);if (result) {rtnl_lock();goto fail_pm_qos;}#ifdef CONFIG_INETlocal->ifa_notifier.notifier_call = ieee80211_ifa_changed;result = register_inetaddr_notifier(&local->ifa_notifier);if (result)goto fail_ifa;
#endif#if IS_ENABLED(CONFIG_IPV6)local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;result = register_inet6addr_notifier(&local->ifa6_notifier);if (result)goto fail_ifa6;
#endifreturn 0;#if IS_ENABLED(CONFIG_IPV6)fail_ifa6:
#ifdef CONFIG_INETunregister_inetaddr_notifier(&local->ifa_notifier);
#endif
#endif
#if defined(CONFIG_INET) || defined(CONFIG_IPV6)fail_ifa:pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,&local->network_latency_notifier);rtnl_lock();
#endiffail_pm_qos:ieee80211_led_exit(local);ieee80211_remove_interfaces(local);fail_rate:rtnl_unlock();ieee80211_wep_free(local);sta_info_stop(local);destroy_workqueue(local->workqueue);fail_workqueue:wiphy_unregister(local->hw.wiphy);fail_wiphy_register:if (local->wiphy_ciphers_allocated)kfree(local->hw.wiphy->cipher_suites);kfree(local->int_scan_req);return result;
}
EXPORT_SYMBOL(ieee80211_register_hw);void ieee80211_napi_add(struct ieee80211_hw *hw, struct napi_struct *napi,struct net_device *napi_dev,int (*poll)(struct napi_struct *, int),int weight)
{struct ieee80211_local *local = hw_to_local(hw);netif_napi_add(napi_dev, napi, poll, weight);local->napi = napi;
}
EXPORT_SYMBOL_GPL(ieee80211_napi_add);void ieee80211_unregister_hw(struct ieee80211_hw *hw)
{struct ieee80211_local *local = hw_to_local(hw);tasklet_kill(&local->tx_pending_tasklet);tasklet_kill(&local->tasklet);pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,&local->network_latency_notifier);
#ifdef CONFIG_INETunregister_inetaddr_notifier(&local->ifa_notifier);
#endif
#if IS_ENABLED(CONFIG_IPV6)unregister_inet6addr_notifier(&local->ifa6_notifier);
#endifrtnl_lock();/** At this point, interface list manipulations are fine* because the driver cannot be handing us frames any* more and the tasklet is killed.*/ieee80211_remove_interfaces(local);rtnl_unlock();cancel_work_sync(&local->restart_work);cancel_work_sync(&local->reconfig_filter);flush_work(&local->sched_scan_stopped_work);ieee80211_clear_tx_pending(local);rate_control_deinitialize(local);if (skb_queue_len(&local->skb_queue) ||skb_queue_len(&local->skb_queue_unreliable))wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");skb_queue_purge(&local->skb_queue);skb_queue_purge(&local->skb_queue_unreliable);destroy_workqueue(local->workqueue);wiphy_unregister(local->hw.wiphy);sta_info_stop(local);ieee80211_wep_free(local);ieee80211_led_exit(local);kfree(local->int_scan_req);
}
EXPORT_SYMBOL(ieee80211_unregister_hw);static int ieee80211_free_ack_frame(int id, void *p, void *data)
{WARN_ONCE(1, "Have pending ack frames!\n");kfree_skb(p);return 0;
}void ieee80211_free_hw(struct ieee80211_hw *hw)
{struct ieee80211_local *local = hw_to_local(hw);mutex_destroy(&local->iflist_mtx);mutex_destroy(&local->mtx);if (local->wiphy_ciphers_allocated)kfree(local->hw.wiphy->cipher_suites);idr_for_each(&local->ack_status_frames,ieee80211_free_ack_frame, NULL);idr_destroy(&local->ack_status_frames);kfree(rcu_access_pointer(local->tx_latency));wiphy_free(local->hw.wiphy);
}
EXPORT_SYMBOL(ieee80211_free_hw);static int __init ieee80211_init(void)
{struct sk_buff *skb;int ret;BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));ret = rc80211_minstrel_init();if (ret)return ret;ret = rc80211_minstrel_ht_init();if (ret)goto err_minstrel;ret = rc80211_pid_init();if (ret)goto err_pid;ret = ieee80211_iface_init();if (ret)goto err_netdev;return 0;err_netdev:rc80211_pid_exit();err_pid:rc80211_minstrel_ht_exit();err_minstrel:rc80211_minstrel_exit();return ret;
}static void __exit ieee80211_exit(void)
{rc80211_pid_exit();rc80211_minstrel_ht_exit();rc80211_minstrel_exit();ieee80211s_stop();ieee80211_iface_exit();rcu_barrier();
}subsys_initcall(ieee80211_init);
module_exit(ieee80211_exit);MODULE_DESCRIPTION("IEEE 802.11 subsystem");
MODULE_LICENSE("GPL");
