NOTE: this page is for archival only, see the note at the end of the page.


  • SME: handle reassociation when the AP is out of range for a moment and then comes back?
  • Implement new regulatory interpretation rules as discussed in this thread. In summary, using the notation outlined for mathematical intervals:

 0) for all 1 <= k < n : MAX_k <= MIN_{k+1}

 1) each rule in the regdomain covers the frequency range (MIN_1, MAX_1]

 2) given C = union (over all k = 1 .. n) of (MIN_k, MAX_k] it must be
   true that (CENTER - BW/2, CENTER + BW/2) is a subset of C

 3) it must be true for all 1 <= k <= n:
       if CENTER in (MIN_k, MAX_k] : BW <= BW_k   

 4) This is easier to formulate algorithmically:
   USE_FLAGS = 0
   for k = 1 .. n
       if (CENTER - BW/2, CENTER + BW/2) intersects (MIN_k, MAX_k]:
           USE_FLAGS |= FLAGS_k


AP support

  • fix the PS filtering code, need to think about how to re-enable it
  • injected frames need to be tied to another virtual interface to get the software sequence number and keys (only relevant for 11w) right
  • internal bridge setting (separated STAs in the BSS)
  • Radar detection (AP DFS or 802.11h)


  • Need to stop TX/RX when a radar is detected for the duration of scan for a new channel.

power saving

  • u-APSD support. Intel has old AP u-APSD patches (incomplete, buffering is done in their firmware)

  • 11v support (eventually)


mac80211 drivers use wpa_supplicant for help with Roaming. This is done by specifying ap_scan=1, which lets wpa_supplicant select the BSS based on scan results. This works but it could use some more enhancements.

To have better roaming we need to have more information about signal strengths (preferably triggers) available to userspace, and need to enhance software scanning to be less disruptive.


  • ieee80211_hdrlen is called very often.
  • Recognition of device incoming frame belongs to can be made much smarter and faster.
  • think about handling probe responses in firmware like b43 can. This requires telling hostapd that it shouldn't be replying to probe requests and having it give the appropriate info to the kernel


  • keep track of stations per virtual interface, helps with the optimisation asked for above site

  • fix CSS colours, for example link colours (if you want to start, look at the files in http:/moin/linuxwireless/css/ and send diffs to <johannes AT sipsolutions DOT net>)

  • fix print view to include a black&white logo

  • the whole testing thing...
    • q/a procedure for stack
    • winlab
    • info on test coverage
    • tests itself need to be documented
    • instructions how to run tests

This is a static dump of the wiki, taken after locking it in January 2015. The new wiki is at
versions of this page: last, v359, v358, v357, v356, v355, v354, v353, v352, v351, v350, v349, v348, v347, v346, v345, v344, v343, v342, v341, v340, v339, v338, v337, v336, v335, v334, v333, v332, v331, v330, v329, v328, v327, v326, v325, v324, v323, v322, v321, v320, v319, v318, v317, v316, v315, v314, v313, v312, v311, v310, v309, v308, v307, v306, v305, v304, v303, v302, v301, v300, v299, v298, v297, v296, v295, v294, v293, v292, v291, v290, v289, v288, v287, v286, v285, v284, v283, v282, v281, v280, v279, v278, v277, v276, v275, v274, v273, v272, v271, v270, v269, v268, v267, v266, v265, v264, v263, v262, v261, v260, v259, v258, v257, v256, v255, v254, v253, v252, v251, v250, v249, v248, v247, v246, v245, v244, v243, v242, v241, v240, v239, v238, v237, v236, v235, v234, v233, v232, v231, v230, v229, v228, v227, v226, v225, v224, v223, v222, v221, v220, v219, v218, v217, v216, v215, v214, v213, v212, v211, v210, v209, v208, v207, v206, v205, v204, v203, v202, v201, v200, v199, v198, v197, v196, v195, v194, v193, v192, v191, v190, v189, v188, v187, v186, v185, v184, v183, v182, v181, v180, v179, v178, v177, v176, v175, v174, v173, v172, v171, v170, v169, v168, v167, v166, v165, v164, v163, v162, v161, v160, v159, v158, v157, v156, v155, v154, v153, v152, v151, v150, v149, v148, v147, v146, v145, v144, v143, v142, v141, v140, v139, v138, v137, v136, v135, v134, v133, v132, v131, v130, v129, v128, v127, v126, v125, v124, v123, v122, v121, v120, v119, v118, v117, v116, v115, v114, v113, v112, v111, v110, v109, v108, v107, v106, v105, v104, v103, v102, v101, v100, v99, v98, v97, v96, v95, v94, v93, v92, v91, v90, v89, v88, v87, v86, v85, v84, v83, v82, v81, v80, v79, v78, v77, v76, v75, v74, v73, v72, v71, v70, v69, v68, v67, v66, v65, v64, v63, v62, v61, v60, v59, v58, v57, v56, v55, v54, v53, v52, v51, v50, v49, v48, v47, v46, v45, v44, v43, v42, v41, v40, v39, v38, v37, v36, v35, v34, v33, v32, v31, v30, v29, v28, v27, v26, v25, v24, v23, v22, v21, v20, v19, v18, v17, v16, v15, v14, v13, v12, v11, v10, v9, v8, v7, v6, v5, v4, v3, v2, v1