Hello ;-) Kata kairous sas exw anaferei thn prothesh ths omadas twn developers pou asxoleitai me tous wireless drivers sto Linux na parexoume kapoiou eidous regulatory control, dhladh na kleidwnoume by default kapoia kanalia pou den provlepetai h xrhsh tous apo ton nomo ana xwra kathws kai na periorisoume thn isxy ekpomphs omoiws sta plaisia tou nomou. O vasikos logos pou theloume kati tetoio einai gia na proselkysoume perissoterous vendors na mas dwsoun specs gia tis kartes tous kathoti oi perissoteroi fovountai oti emas aplws mas endiaferei na doulevoun oi kartes sto full kai oxi na diasfalizoume th swsth xrhsh tous. An kapoios pou xrhsimopoiei Linux poiastei na ekpempei ektws nomikwn plaisiwn xwris sxetikh adeia, ousiastika o chip vendor h o OEM vendor kindynevoun na pathoun megalh zhmia kathoti akyrwnetai to declaration of conformity pou exoun ypograpsei kai ousiastika to proion tous na aposyrthei ap' thn agora h meros ayths. Epishs me ayto ton tropo epitrepoume se atoma/etairies pou theloun na xrhsimopoihsoun to Linux gia emporikous skopous (px xrhsimopoiwntas OpenWRT pou einai poly diadedomeno) na exoun allo ena kinhtro. Telos yparxoun outws h allws kapoioi periorismoi logw hw, afou oi kartes exoun sxediastei na ekpempoun se sygekrimena eyrh syxnwthtwn kai me sygekrimenh max isxy, opote an kapoios ekpempsei ektws oriwn kai me megalh isxy kindynevei na katastrepsei thn karta h na exei poly kako performance (sygekrimena gia tis Atheros exoume periptwsh pou kapoios katestrepse ton pre amplifier vazontas thn karta na ekpempsei sta 6Ghz, enw otan h karta ekpempei se full isxy, ola ta rates apo 18Mb kai epanw synithws exoun corrupted spectral mask kai ekpempontai skoupidia). Ap' thn allh omws den theloume se kamia periptwsh na efarmosoume praktikes DRM, den theloume na apagoreysoume stous xrhstes tou Linux na kanoun to otideipote me tis kartes tous, apla theloume na prostateysoume toso aytous (afou mporei na ekpempoun ektws oriwn en angoia tous shkwnontas px ena AP) oso kai to Linux apo tous diaforous kakovoulous pou yparxoun trygyrw (giati yparxoun arketes etairies ekei eksw pou einai etoimoi na mas th pesoun). Den theloume se kamia periptwsh na "mas vgei to onoma" oti to Linux kai oi Linuxades kseskizoun to fasma. Etsi katalhksame sthn ekshs ylopoihsh... Exoume enan Central Regulatory Domain Agent (CRDA) o opoios trexei sto userspace (o kwdikas edw -> http://git.kernel.org/?p=linux/kernel/git/mcgrof/crda.git;a=tree) kai xrhsimopoiei mia binary database pou thn exoume kanei sign oi developers tou kernel (vasika o kernel maintainer ek merous mas). H database den einai tipote allo apo ena txt arxeio pou apla exei ginei encrypted (mporeite na to deite edw -> http://git.kernel.org/?p=linux/kernel/git/linville/wireless-regdb.git;a=blob;f=db.txt;hb=HEAD) me to private key tou John kai o CRDA exei to public key. By default loipon oloi xrhsimopoioun thn default database pou exoume kanei sign kai egyomaste oti einai entaksei. An twra kapoios thelei na xrhsimopoihsei diaforetikh database (eitai aytos einai etairia, eitai distro, eitai o opoiosdhpote telos pantwn) mporei na ftiaksei to diko tou db.txt, na to ypograpsei me to private key tou kai na valei to public key tou ston CRDA tou. Tha mou peite ti nohma exei an mporei na parakamfthei etsi eykola to regulatory control na agxonomaste ? Nomika loipon an kapoios kanei ayth th douleia emeis den egyomaste gi' ayton opote exei olh thn eythynh twn praksewn tou, etsi prostatevoume to Linux kai oti ayto synepagetai. Einai san ayto pou kanei px h Mikrotik pou se afhnei na anoikseis ola ta kanalia (an plhrwseis ennoeitai :P) arkei na symfwniseis me to License (isa isa pou emeis to kanoume poio ousiastika afou kaneis synithws den diavazei to license, otan omws tha xreiastei na ftiaksei h na xrhsimopoihsei mia diaforetikh database tote syneidhta tha kserei ti kanei). Kati allo pou einai endiaferon einai pws kseroume pou vrisketai o xrhsths h telos pantwn se poio regulatory domain vrisketai kathe fora... a) To prwto vhma einai na doume mhpws h karta exei kapou programmed ayth th plhroforia (px. sthn EEPROM h hadcoded sto firmware) b) An den yparxei ayth h plhroforia tote o xrhsths mporei na orisei th xwra sthn opoia vrisketai (mesw tou iw -to kainourio ergaleio pou sto mellon tha antikatastisei ta wireless tools- ki elpizw kai mesa ap' ton NetworkManager) d) Epishs yparxei to 802.11d ap' to opoio mporoume na paroume ayth th plhroforia (an mas th dinei to AP) alla dystyxws den to ylopoioun panta (kai akoma ki an to ylopoioun, oi perissoteroi -stokoi as mou epitrapei o xarakthrismos- den mpainoun ston kopo na kanoun swsta configure ta AP pou sthnoun), enw tha mporousame na xrhsimopoihsoume ayth th plhroforia ap' ton SNMP (opou epishs omws oloi variountai na kanoun swsta configure). Koinws ap ta parapanw mono to a einai to sigouro gi' ayto kai einai to default kai to "prwto se protimhsh" kai se kapoies periptwseis einai kai locked (dhladh an yparxei ayto den proxwrame sta alla 2 ki apla epitrepoume th xrhsh "world" domains pou praktika einai domains opou nai men mporeis na xrhsimopoieis kapoia kanalia alla mono ws client kai mono kanontas passive scan -dld kaneis sniff kai an yparxei kapoio AP sto kanali tote mporeis na syndetheis epanw tou kanonika). Edw -> http://wireless.kernel.org/en/developers/Regulatory perigrafetai analytikotera h olh arxitektonikh. Edw -> http://wireless.kernel.org/en/developers/Regulatory/statement einai to public statement pou ypografoume oi developers gia na kanoume gnwstes tis protheseis mas ston eksw kosmo (kai kyriws opws sas eipa stous vendors kai fysika stous antistoixous foreis). Twra yparxoun kapoies kartes pou exoun epipleon capabilities pera apo to na ekpempoun se diafora ranges opws px. oi kartes pou ypostirizoun diafora "turbo" modes kathws kai alles kartes (opws oi Atheros) pou yposthrizoun diaforetiko spacing metaksy twn kanaliwn (dhladh mesa sta epitrepta ranges exoume perissoteres diathesimes syxnothtes na paiksoume) kai diaforetiko channel width (half/quarter rate/XR/turbo). Parolo pou to regulation afora mono to eyros twn syxnothtwn kai to tx power gia texnikous logous den symfairei by default na kanoume enable tetoia features (vl. xrhsh mnhmhs, xronos scan klp), etsi syzhtagame pws tha mporousame genikws na mporoume na kanoume enable ayta ta features on demand afou fortwsei o driver. H protash mou pou telika symfwnoun arketoi (metaksy twn opoiwn kai o John) einai na ftiaksoume ena mhxanismo gia na mporoume na kanoume register channels runtime. Me ayto ton tropo tha mporoume px. na kanoume register oles tis endiameses syxnothtes ws extra kanalia (me noumera apo to 200 kai panw px.) opws epishs kai gia kathe tetoio functionality na kanoume register ena ksexwristo range apo kanalia (panta on demand, px otan o xrhsths kanei enable ta half rate kanalia tha ginontai unregister ta prohgoumena extra kanalia kai tha ginontai register ta kainouria me to half rate flag set). To kathe kanali exei kapoia flags opou ekei tha exoume kanei enable ta diafora features kai o driver tha dra analoga (enw ta flags tha ginontai list sth lista me ta kanalia tou driver me to iw). Einai mia prwth idea vevaia kai den exoume mpei se texnikes leptomeries akoma (tha to syzhtisoume mallon sto epomeno summit) alla to kalo einai oti yparxei diathesh gia kati tetoio. Telos kapoia endiaferonta infos apo to development twn teleytaiwn mhnwn... a) O ath5k apektise tx power support kai pleon mporeite na poiasete kanonika mexri 27.5Mb afou ta rates panw ap' ta 18Mb pleon doulevoun, syntoma o ath5k tha veltiwthei dramatika, eidika sto kommati tou phy (edw na eyxaristhsw to ellak gia thn oikonomikh enisxysh, htan kati pou tha ekana outws h allws alla opws kai na xei htan ena epipleon kinhtro gia na doulepsw poio entatika -vevaia h sxolh paei peripatto alla tha th palepsw kapws :P-). b) O Jouni ekane submit mia seira apo patches pou kanoun enable ston ath9k ta virtual ifs (opws ta VAPs ston MadWiFi alla pleon tha ginetai na exete kai virtual STAs klp) enw eishgage kai mia nea texnikh opou tha exoume virtual radios (ayto TA SPAEI) dhladh tha mporeite me mia karta na eisaste syndedemenoi se APs pou paizoun se diaforetika kanalia (proypothesh einai h karta na mporei na kanei grhgora switch -kai an to epixeirhsete tha sas proteina na exete megalo beacon interval sta APs-). Vevaia ayta mexri na ftasoun stous telikous xrhstes tha parei arketos kairos (akoma oute oi prosthikes sto cfg80211/nl80211 den exoun ginei, poso mallon sto iw -ennoeitai pws den prokeitai na ginei kati tetoio me ta wireless tools, ayta prospathoume na ta ksefortwthoume asap-). c) Asxeto me wireless alla pleon to tux3 exei arxisei na doulevei ikanopoihtika (kanan boot apo tux3 partition poly prosfata !) kai fainetai na vriskei siga siga to dromo tou gia ton kernel -ginetai syzhthsh ayto ton kairo sth lista twn xrhstwn tou kernel.org gia to git repository tou klp. Gia osous de gnwrizoun to tux3 einai ena kainourio fs pou yposxetai polla kai einai h ekseliksh tou tux2 to opoio eixe kolhmata logw patentwn (aytos pou to eftiakse eixe ylopoihsei poly prin patentaristoun tis diafores leitourgies/algorithmous klp pou to apoteloun kai eprepe na apodiksei oti den einai elefantas, perissotera infos edw -> http://lkml.indiana.edu/hypermail/linux/kernel/0010.0/0343.html -etsi gia na thymomaste poso evil einai oi patentes kai posh zhmia kanoun). Perissotera infos edw -> http://tux3.org. Kapoies apo tis methodous pou xrhsimopoiountai sto tux3 efarmozontai sto git... -- GPG ID: 0xD21DB2DB As you read this post global entropy rises. Have Fun ;-) Nick