802.11 drivers will use ieee80211_find_rxnode to match each received
packet with the ieee80211_node belonging to the sender. The driver
will use the ieee80211_node to track the sender's RSSI and other
statistics for, e.g., rate adaptation.
ieee80211_find_rxnode "fakes-up" missing ieee80211_nodes in IBSS
mode and in ad-hoc demo mode when it is appropriate. See the comments
in the source.
Also add ieee80211_find_txnode, which looks up the ieee80211_node
belonging to a MAC destination. ieee80211_find_txnode will also
fake-up missing nodes in IBSS/ad-hoc demo mode.
In ieee80211_encap, use ieee80211_find_txnode. This fixes the bug
in ad hoc packet-transmission reported by Greg Troxel, Urban Boquist,
and Kurt Schreiner.
Adaptation Strategy for IEEE 802.11 WLAN via Received Signal Strength
Measurement" by Javier del Prado Pavon and Sunghyun Choi. This
module should provide faster adaptation and higher throughput than
Lucent's rate-adaptation scheme.
Individual drivers need to be modified to use this module. Patches
for wi(4) are forthcoming.
a different BSS, because that keeps drivers like atw from detecting
ad hoc beacons with the same SSID but different BSSID for the
purpose of IBSS merges.
This should be revisited: maybe drivers should check for beacons
before handing packets up with ieee80211_input(). However, this
restores the atw(4) to working like it did with the old 802.11
layer, and it *is* nice to re-use the 802.11 layer's packet-decode
& -dispatch code (i.e., the ic_recv_mgmt callback).
* Add Kevin Lahey's power-saving support from the old 802.11 layer
* Support for frequency-hopping PHYs
* Add support frequency-hopping PHY mode, IFM_IEEE80211_FH
* Add channel flags for frequency-hopping
* Add mode<->media mappings in for FH PHY in ieee80211_media2rate
and ieee80211_rate2media
* Stop using IFM_MAKEMODE macro since the mode constants
(e.g., IFM_IEEE80211_11A) are pre-shifted in sys/net/if_media.h
* Add some PLCP constants.
* Add Kevin Lahey's power-saving support from the old 802.11 layer
* Add a FHPARMS or DSPARMS info element to probe responses and beacons
as appropriate.
* Add Kevin Lahey's power-saving support from the old 802.11 layer
* Add my stop-gap rate-selection routine, ieee80211_get_rate,
from the old 802.11 layer
* Also from the old 802.11 layer: factor ieee80211_match_bss out
of ieee80211_end_scan, since atw(4) uses it for IBSS merges.
#ifdef __FreeBSD__
/* FreeBSDism */
#else
/* NetBSDism */
#endif
An important and non-obvious change is in ieee80211_mgmt_output,
#ifdef __FreeBSD__
KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null"));
#endif
Because NetBSD mbufs are not bzero'd like FreeBSD's, we cannot
count on rcvif == NULL.
striving to keep the diffs short and simple.
* Replace FreeBSDisms (e.g. struct arpcom) with conditionally-compiled
NetBSDism (struct ethercom).
* Add compatibility shims in ieee80211_compat.*: provide NetBSD with
if_printf, for example.
* Convert FreeBSD node mutex uses to generic node critical-section
protection (ieee80211_node_critsect_begin, _end), replace
FreeBSD atomic arithmetic with generic alternative, and implement
generics in NetBSD
* Provide NetBSD-style 802.11 ioctls
* Style nits
