---
name: "ieee80211_add_xrates"
section: "9"
platform: "linux"
package: "freebsd-manpages"
version: "6.0-5"
release: "Debian 4.0 (Etch)"
platforms: ["linux"]
url: "https://new.carta.tech/ieee80211_add_xrates"
---

# ieee80211\_add\_xrates(9)

software 802.11 stack output functions

## NAME

**ieee80211\_encap**, **ieee80211\_add\_rates**, **ieee80211\_add\_xrates**, **ieee80211\_send\_mgmt** – software 802.11 stack output functions

## SYNOPSIS

**#include \<net80211/ieee80211\_var.h\>**

**#include \<net80211/ieee80211\_proto.h\>**

*struct* *mbuf* *\**\

**ieee80211\_encap**(*struct ifnet \*ifp*, *struct mbuf \*m*, *struct ieee80211\_node \*\*pni*);

*u\_int8\_t* *\**\

**ieee80211\_add\_rates**(*u\_int8\_t \*frm*, *const struct ieee80211\_rateset \*rs*);

*u\_int8\_t* *\**\

**ieee80211\_add\_xrates**(*u\_int8\_t \*frm*, *const struct ieee80211\_rateset \*rs*);

*int*\

**ieee80211\_send\_mgmt**(*struct ieee80211com \*ic*, *struct ieee80211\_node \*ni*, *int type*, *int arg*);

## DESCRIPTION

These functions handle the encapsulation and transmission of 802.11 frames within the software 802.11 stack.

The **ieee80211\_encap**() function encapsulates an outbound data frame contained within the mbuf chain *m* from the interface *ifp*. The argument *\*pni* is a reference to the destination node.

If the function is successful, the mbuf chain is updated with the 802.11 frame header prepended, and a pointer to the head of the chain is returned. If an error occurs, NULL will be returned, and *\*pni* is also set to NULL. The caller is responsible for freeing the node reference if *\*pni* is non-NULL on return. The convention is that *ic\_bss* is not reference counted; the caller is responsible for maintaining this reference count.

The **ieee80211\_add\_rates**() utility function is used to add the rate set element *\*rs* to the frame *frm*. A pointer to the location in the buffer after the addition of the rate set is returned. It is typically used when constructing management frames from within the software 802.11 stack.

The **ieee80211\_add\_xrates**() utility function is used to add the extended rate set element *\*rs* to the frame *frm*. A pointer to the location in the buffer after the addition of the rate set is returned. It is typically used when constructing management frames from within the software 802.11 stack in 802.11g mode.

The **ieee80211\_send\_mgmt**() function transmits a management frame on the interface *ic* to the destination node *ni* of type *type*.

The argument *arg* specifies either a sequence number for authentication operations, a status code for \[re\]association operations, or a reason for deauthentication and deassociation operations.

Nodes other than *ic\_bss* have their reference count incremented to reflect their use for an indeterminate amount of time. This reference is freed when the function returns.

The function returns 0 if successful; if temporary buffer space is not available, the function returns ENOMEM.

## SEE ALSO

[ieee80211(9)](/ieee80211/9.md), [ifnet(9)](/ifnet/9.md)

## HISTORY

The **ieee80211** series of functions first appeared in NetBSD 1.5, and were later ported to FreeBSD 4.6.

## AUTHORS

This manual page was written by Bruce M. Simpson ⟨bms@FreeBSD.org⟩ and Darron Broad ⟨darron@kewl.org⟩.