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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 *
     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), ifnet(9)

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〉.