> For the complete documentation index, see [llms.txt](https://book.bsdcn.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.bsdcn.org/man/man9/ieee80211_input.9.md).

# ieee80211\_input.9

`ieee80211_input` — 软件 802.11 栈输入函数

## 名称

`ieee80211_input`

## 概要

```c
#include <net80211/ieee80211_var.h>
```

```c
void
ieee80211_input(struct ieee80211_node *, struct mbuf *, int rssi, int noise)

void
ieee80211_input_all(struct ieee80211com *, struct mbuf *, int rssi, int noise)
```

## 描述

支持 802.11 设备驱动程序的 `net80211` 层要求接收处理是单线程的。通常使用专用的驱动程序 [taskqueue(9)](/man/man9/taskqueue.9.md) 线程完成。`ieee80211_input` 和 `ieee80211_input_all` 处理接收到的 802.11 帧，设计用于该上下文；例如，不得持有任何驱动程序锁。

在 `mbuf` 中传递上来的帧必须在前部具有 802.11 协议头；所有设备特定信息和/或 PLCP 必须移除。任何 CRC 必须从帧末尾剥离。802.11 协议头应 32 位对齐以获得最佳性能，但接收处理不要求如此。如果帧持有有效载荷且未对齐到 32 位边界，则有效载荷将被重新对齐，使其适合 [ip(4)](/man/man4/ip.4.md) 等协议处理。

如果设备（如 [ath(4)](/man/man4/ath.4.md)）在 802.11 头之后插入填充以将有效载荷对齐到 32 位边界，则必须设置 `IEEE80211_C_DATAPAD` 能力。否则，头和有效载荷在 mbuf 链中被视为连续的。

如果接收到的帧必须通过 A-MPDU 接收重排序缓冲区，则 mbuf 必须标记 `M_AMPDU` 标志。注意，目前要求来自 Block ACK 流处于活动状态的站和 TID 的所有帧都如此，而不仅仅是 A-MPDU 聚合。检查站节点表条目的 `ni_flags` 中的 `IEEE80211_NODE_HT` 即可，任何不需要重排序处理的帧将以最小开销调度。

`rssi` 参数是以 0.5dBm 为单位相对于噪声底测量的帧接收信号强度指示。`noise` 参数是接收帧时噪声底的最佳近似值（以 dBm 为单位）。RSSI 和噪声由 `net80211` 层用于在站模式下做出扫描和漫游决策，以及在 hostap 和类似模式下进行自动信道选择。否则，这些值对用户应用程序可用（rssi 表示为最近十个值的过滤平均值，噪声底为最后报告的值）。

## 参见

[ieee80211(9)](/man/man9/ieee80211.9.md)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://book.bsdcn.org/man/man9/ieee80211_input.9.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.