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Linux Wireless之WiFi Beacon Hint 流程分析

  • 2026-06-27 20:49:22
Linux Wireless之WiFi Beacon Hint 流程分析

Linux Wireless之WiFi Beacon Hint 流程分析

背景及概述

最近遇到了个问题,机器在使用无线的时候,wpa_supplicant 报了如下日志:

Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Event message available
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Drv Event 42 (NL80211_CMD_REG_BEACON_HINT) received for wlo4
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Regulatory beacon hint
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Channel (before): freq=5180 max_tx_power=2000 no-IR
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Channel (after): freq=5180 max_tx_power=2000
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: wlo4: Event CHANNEL_LIST_CHANGED (27) received
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: wlo4: CTRL-EVENT-REGDOM-CHANGE init=BEACON_HINT type=UNKNOWN
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: wlo4: Updating hw mode
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Regulatory information - country=00
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: 2402-2472 @ 40 MHz 20 mBm
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: 2457-2482 @ 20 MHz 20 mBm (no IR)
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: 2474-2494 @ 20 MHz 20 mBm (no OFDM) (no IR)
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: 5170-5250 @ 80 MHz 20 mBm (no IR)
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: 5250-5330 @ 80 MHz 20 mBm (DFS) (no IR)
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: 5490-5730 @ 160 MHz 20 mBm (DFS) (no IR)
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: 5735-5835 @ 80 MHz 20 mBm (no IR)
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: 57240-63720 @ 2160 MHz 0 mBm
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Added 802.11b mode based on 802.11g information
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Mode IEEE 802.11g: 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467[NO_IR] 2472[NO_IR] 2484[NO_IR]
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Mode IEEE 802.11a: 5180 5200[NO_IR] 5220[NO_IR] 5240[NO_IR] 5260[NO_IR][RADAR] 5280[NO_IR][RADAR] 5300[NO_IR][RADAR] 5320[NO_IR][RADAR] 5500[NO_IR][RADAR] 5520[NO_IR][RADAR] 5540[NO_IR][RADAR] 5560[NO_IR][RADAR]
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: nl80211: Mode IEEE 802.11b: 2412 2417 2422 2427 2432 2437 2442 2447 2452 2457 2462 2467[NO_IR] 2472[NO_IR] 2484[NO_IR]
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: wlo4: Determining shared radio frequencies (max len 1)
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: wlo4: Shared frequencies (len=0): completed iteration
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: P2P: Add operating class 81
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: P2P: Channels - hexdump(len=11): 01 02 03 04 05 06 07 08 09 0a 0b
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: P2P: Add operating class 115
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: P2P: Channels - hexdump(len=1): 24
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: P2P: Add operating class 130
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: P2P: Channels - hexdump(len=1): 24
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: P2P: Update channel list
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: P2P: channels: 81:1,2,3,4,5,6,7,8,9,10,11 115:36 130:36
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: P2P: cli_channels:
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: wlo4: Already scanning - Reschedule the incoming scan req
Jun  4 15:25:29 3-5-pc wpa_supplicant[26279]: wlo4: Setting scan request: 1.000000 sec

触发了 Beacon Hint 机制,今天就来看看 Beacon Hint 机制及其流程。

Beacon Hint 是 Linux 内核无线子系统 (cfg80211) 的一种机制,用于在 World Roaming 模式下,通过扫描发现 AP 的 Beacon 帧,自动解锁受限信道 (如 2.4GHz ch12-13 或 5GHz 非 DFS 信道)。

它其实属于无线监管域( Regulatory Domain )处理的一部分,在前面分析监管域处理流程的时候也有提到:

Beacon Hint 完整流程

┌─────────────────────────────────────────────────────────────────────────────┐
│                           Beacon Hint 完整流程                              │
└─────────────────────────────────────────────────────────────────────────────┘

[扫描阶段]
    │
    ├─ WiFi 驱动执行扫描
    │
    ├─ 发现 BSS (Beacon 帧)
    │   │
    │   └─ 调用 regulatory_hint_found_beacon()
    │       │
    │       ├─ 过滤: 已发现/雷达/2.4G ch1-11
    │       │
    │       └─ 加入 reg_pending_beacons 列表
    │
    └─ 调度 reg_work 工作队列

[处理阶段]
    │
    ├─ reg_todo() 工作函数
    │   │
    │   └─ reg_process_pending_beacon_hints()
    │       │
    │       └─ 遍历所有 wiphy
    │           │
    │           └─ handle_reg_beacon()
    │               │
    │               ├─ 检查 World Roaming
    │               │
    │               ├─ 移除 NO_IR 标志
    │               │
    │               └─ 发送 Netlink 事件
    │
    └─ Realtek 驱动处理(驱动私有处理)
        │
        ├─ rtw_process_beacon_hint()
        │   │
        │   └─ 移除 RTW_CHF_NO_IR
        │
        └─ rtw_beacon_hint_ch_change_notifier()
            │
            └─ 更新 regulatory 并通知

[过期阶段](驱动私有处理)
    │
    └─ rtw_beacon_hint_expire()
        │
        └─ 恢复 NO_IR 标志

扫描发现 BSS
是否已发现 beacon?
跳过
是雷达信道?
2.4G ch1-11?
regulatory_hint_found_beacon
已在 pending 列表?
分配 reg_beacon
加入 reg_pending_beacons
调度 reg_work 工作队列
reg_todo
reg_process_pending_beacon_hints
遍历所有 wiphy
wiphy_update_new_beacon
handle_reg_beacon
信道匹配?
beacon_found?
设置 beacon_found = true
World Roaming?
DISABLE_BEACON_HINTS?
有 NO_IR 标志?
移除 NO_IR 标志
nl80211_send_beacon_hint_event
通知用户空间

关键函数说明

内核 cfg80211 层

函数
文件
说明
regulatory_hint_found_beacon()
reg.c:3666
入口函数,扫描发现 beacon 时调用
reg_process_pending_beacon_hints()
reg.c:3138
处理待处理的 beacon hints
handle_reg_beacon()
reg.c:2187
处理单个 beacon,移除 NO_IR
wiphy_update_new_beacon()
reg.c:2231
更新 wiphy 的 beacon 信息
reg_is_world_roaming()
reg.c:2164
判断是否 world roaming 模式
is_world_regdom()
reg.c:369
判断 alpha2 是否为 "00"
nl80211_send_beacon_hint_event()
nl80211.c:18663
发送 netlink 事件

World Roaming 判断条件

判断流程

reg_is_world_roaming
cr->alpha2是否为00?
返回 true
wr->alpha2是否为00?
last_request 存在?
返回 false
initiator != COUNTRY_IE?
wiphy 有 CUSTOM_REG?

判断函数

static bool reg_is_world_roaming(struct wiphy *wiphy)
{
    const
struct ieee80211_regdomain *cr = get_cfg80211_regdom();
    const
struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
struct regulatory_request *lr =
 get_last_request();

    // 条件1: alpha2 为 "00" (world regdom)

    if
 (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
        return
 true;

    // 条件2: 驱动自定义 regdom 且非 country IE 触发

    if
 (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
        wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
        return
 true;

    return
 false;
}

触发场景

场景
alpha2
说明
初始启动
"00"
regulatory_hint_core("00")
用户设置
"00"
iw reg set 00
CRDA 失败
"00"
查询失败回退到 world regdom
驱动自定义
任意
设置 REGULATORY_CUSTOM_REG

查看当前状态

# 查看当前 regulatory domain
iw reg get

# World Roaming 模式输出:

country 00: DFS-UNSET
    (2402 - 2472 @ 40), (N/A, 20), (N/A)
    (2457 - 2482 @ 20), (N/A, 20), (N/A), NO-IR
    ...

# 已确定国家输出:

country CN: DFS-FCC
    (2402 - 2482 @ 40), (N/A, 20), (N/A)
    ...

Netlink 事件格式

NL80211_CMD_REG_BEACON_HINT

┌─────────────────────────────────────────────────────────────┐
│                    Netlink Message                          │
├─────────────────────────────────────────────────────────────┤
│ NL80211_CMD_REG_BEACON_HINT                                 │
├─────────────────────────────────────────────────────────────┤
│ NL80211_ATTR_WIPHY         (wiphy index)                   │
├─────────────────────────────────────────────────────────────┤
│ NL80211_ATTR_FREQ_BEFORE   (变化前信道)                     │
│   ├─ frequency                                              │
│   ├─ channel                                                │
│   └─ flags (NO_IR, DFS, etc.)                              │
├─────────────────────────────────────────────────────────────┤
│ NL80211_ATTR_FREQ_AFTER    (变化后信道)                     │
│   ├─ frequency                                              │
│   ├─ channel                                                │
│   └─ flags (NO_IR removed)                                 │
└─────────────────────────────────────────────────────────────┘

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  1. CONNECT:[ UseTime:0.000527s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000759s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008780s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.023415s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000799s ]
  6. SELECT * FROM `set` [ RunTime:0.035886s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001003s ]
  8. SELECT * FROM `article` WHERE `id` = 498754 LIMIT 1 [ RunTime:0.088665s ]
  9. UPDATE `article` SET `lasttime` = 1783006220 WHERE `id` = 498754 [ RunTime:0.032787s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.006186s ]
  11. SELECT * FROM `article` WHERE `id` < 498754 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.015448s ]
  12. SELECT * FROM `article` WHERE `id` > 498754 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.014545s ]
  13. SELECT * FROM `article` WHERE `id` < 498754 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.036373s ]
  14. SELECT * FROM `article` WHERE `id` < 498754 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.063066s ]
  15. SELECT * FROM `article` WHERE `id` < 498754 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.033621s ]
0.433189s