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ieee80211_input(9) [netbsd man page]

IEEE80211_INPUT(9)					   BSD Kernel Developer's Manual					IEEE80211_INPUT(9)

ieee80211_input, ieee80211_decap, ieee80211_recv_mgmt -- software 802.11 stack input functions SYNOPSIS
#include <net80211/ieee80211_var.h> #include <net80211/ieee80211_proto.h> void ieee80211_input(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni, int rssi, u_int32_t rstamp); struct mbuf * ieee80211_decap(struct ieee80211com *ic, struct mbuf *m); void ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni, int subtype, int rssi, u_int32_t rstamp); DESCRIPTION
These functions process received 802.11 frames. The ieee80211_input() function takes an mbuf chain m containing a complete 802.11 frame from the driver ic and passes it to the software 802.11 stack for input processing. The ni argument specifies an instance of struct ieee80211_node (which may be driver-specific) represent- ing the node from which the frame was received. The arguments rssi and stamp are typically derived from on-card data structures; they are used for recording the signal strength and time received of the frame respectively. The ieee80211_decap() function performs decapsulation of the 802.11 frame in the mbuf chain m received by the device ic, taking the form of the 802.11 address fields into account; the structure of 802.11 addresses vary according to the intended source and destination of the frame. It is typically called from within ieee80211_input(). The ieee80211_recv_mgmt() performs input processing for 802.11 management frames. It is typically called from within ieee80211_input(). SEE ALSO
ieee80211(9) HISTORY
The ieee80211 series of functions first appeared in NetBSD 1.5, and were later ported to FreeBSD 4.6. AUTHORS
This man page was written by Bruce M. Simpson <> and Darron Broad <>. BUGS
There is no netisr queue specifically for the software 802.11 stack yet. BSD
September 12, 2006 BSD

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IEEE80211_INPUT(9)					   BSD Kernel Developer's Manual					IEEE80211_INPUT(9)

ieee80211_input -- software 802.11 stack input functions SYNOPSIS
#include <net80211/ieee80211_var.h> void ieee80211_input(struct ieee80211_node *, struct mbuf *, int rssi, int noise); void ieee80211_input_all(struct ieee80211com *, struct mbuf *, int rssi, int noise); DESCRIPTION
The net80211 layer that supports 802.11 device drivers requires that receive processing be single-threaded. Typically this is done using a dedicated driver taskqueue(9) thread. ieee80211_input() and ieee80211_input_all() process received 802.11 frames and are designed for use in that context; e.g. no driver locks may be held. The frame passed up in the mbuf must have the 802.11 protocol header at the front; all device-specific information and/or PLCP must be removed. Any CRC must be stripped from the end of the frame. The 802.11 protocol header should be 32-bit aligned for optimal performance but receive processing does not require it. If the frame holds a payload and that is not aligned to a 32-bit boundary then the payload will be re-aligned so that it is suitable for processing by protocols such as ip(4). If a device (such as ath(4)) inserts padding after the 802.11 header to align the payload to a 32-bit boundary the IEEE80211_C_DATAPAD capa- bility must be set. Otherwise header and payload are assumed contiguous in the mbuf chain. If a received frame must pass through the A-MPDU receive reorder buffer then the mbuf must be marked with the M_AMPDU flag. Note that for the moment this is required of all frames received from a station and TID where a Block ACK stream is active, not just A-MPDU aggregates. It is sufficient to check for IEEE80211_NODE_HT in the ni_flags of the station's node table entry, any frames that do not require reorder pro- cessing will be dispatched with only minimal overhead. The rssi parameter is the Receive Signal Strength Indication of the frame measured in 0.5dBm units relative to the noise floor. The noise parameter is the best approximation of the noise floor in dBm units at the time the frame was received. RSSI and noise are used by the net80211 layer to make scanning and roaming decisions in station mode and to do auto channel selection for hostap and similar modes. Other- wise the values are made available to user applications (with the rssi presented as a filtered average over the last ten values and the noise floor the last reported value). SEE ALSO
ieee80211(9) BSD
August 4, 2009 BSD
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