Проект OpenNet: MAN ieee80211_encap (9) Ядро (FreeBSD и Linux)

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ieee80211_encap (9)

>> ieee80211_encap (9) ( FreeBSD man: Ядро )

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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 * Fo ieee80211_encap Fa struct ifnet *ifp struct mbuf *m struct ieee80211_node **pni Fc Ft 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 Fo ieee80211_send_mgmt Fa struct ieee80211com *ic struct ieee80211_node *ni int type int arg Fc

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 Fa m from the interface Fa ifp . The argument Fa *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 Fa *pni is also set to NULL The caller is responsible for freeing the node reference if Fa *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 Fa *rs to the frame Fa 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 Fa *rs to the frame Fa 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 Fa ic to the destination node Fa ni of type Fa type .

The argument Fa 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 Er ENOMEM .