123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644164516461647164816491650165116521653165416551656165716581659166016611662166316641665166616671668166916701671167216731674167516761677167816791680168116821683168416851686168716881689169016911692169316941695169616971698169917001701170217031704170517061707170817091710171117121713171417151716171717181719172017211722172317241725172617271728172917301731173217331734173517361737173817391740174117421743174417451746174717481749175017511752175317541755175617571758175917601761176217631764176517661767176817691770177117721773177417751776177717781779178017811782178317841785178617871788178917901791179217931794179517961797179817991800180118021803180418051806180718081809181018111812181318141815181618171818181918201821182218231824182518261827182818291830183118321833183418351836183718381839184018411842184318441845184618471848184918501851185218531854185518561857185818591860186118621863186418651866186718681869187018711872187318741875187618771878187918801881188218831884188518861887188818891890189118921893189418951896189718981899190019011902190319041905190619071908190919101911191219131914191519161917191819191920192119221923192419251926192719281929193019311932193319341935193619371938193919401941194219431944194519461947194819491950195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204420452046204720482049205020512052205320542055205620572058205920602061206220632064206520662067206820692070207120722073207420752076207720782079208020812082208320842085208620872088208920902091209220932094209520962097209820992100210121022103210421052106210721082109211021112112211321142115211621172118211921202121212221232124212521262127212821292130213121322133213421352136213721382139214021412142214321442145214621472148214921502151215221532154215521562157215821592160216121622163216421652166216721682169217021712172217321742175217621772178217921802181218221832184218521862187218821892190219121922193219421952196219721982199220022012202220322042205220622072208220922102211221222132214221522162217221822192220222122222223222422252226222722282229223022312232223322342235223622372238223922402241224222432244224522462247224822492250225122522253225422552256225722582259226022612262226322642265226622672268226922702271227222732274227522762277227822792280228122822283228422852286228722882289229022912292229322942295229622972298229923002301230223032304230523062307230823092310231123122313231423152316231723182319232023212322232323242325232623272328232923302331233223332334233523362337233823392340234123422343234423452346234723482349235023512352235323542355235623572358235923602361236223632364236523662367236823692370237123722373237423752376237723782379238023812382238323842385238623872388238923902391239223932394239523962397239823992400240124022403240424052406240724082409241024112412241324142415241624172418241924202421242224232424242524262427242824292430243124322433243424352436243724382439244024412442244324442445244624472448244924502451245224532454245524562457245824592460246124622463246424652466246724682469247024712472247324742475247624772478247924802481248224832484248524862487248824892490249124922493249424952496249724982499250025012502250325042505250625072508250925102511251225132514251525162517251825192520252125222523252425252526252725282529253025312532253325342535253625372538253925402541254225432544254525462547254825492550255125522553255425552556255725582559256025612562256325642565256625672568256925702571257225732574257525762577257825792580258125822583258425852586258725882589259025912592259325942595259625972598259926002601260226032604260526062607260826092610261126122613261426152616261726182619262026212622262326242625262626272628262926302631263226332634263526362637263826392640264126422643264426452646264726482649265026512652265326542655265626572658265926602661266226632664266526662667266826692670267126722673267426752676267726782679268026812682268326842685268626872688268926902691269226932694269526962697269826992700270127022703270427052706270727082709271027112712271327142715271627172718271927202721272227232724272527262727272827292730273127322733273427352736273727382739274027412742274327442745274627472748274927502751275227532754275527562757275827592760276127622763276427652766276727682769277027712772277327742775277627772778277927802781278227832784278527862787278827892790279127922793279427952796279727982799280028012802280328042805280628072808280928102811281228132814281528162817281828192820282128222823282428252826282728282829283028312832283328342835283628372838283928402841284228432844284528462847284828492850285128522853285428552856285728582859286028612862286328642865286628672868286928702871287228732874287528762877287828792880288128822883288428852886288728882889289028912892289328942895289628972898289929002901290229032904290529062907290829092910291129122913291429152916291729182919292029212922292329242925292629272928292929302931293229332934293529362937293829392940294129422943294429452946294729482949295029512952295329542955295629572958295929602961296229632964296529662967296829692970297129722973297429752976297729782979298029812982298329842985298629872988298929902991299229932994299529962997299829993000300130023003300430053006300730083009301030113012301330143015301630173018301930203021302230233024302530263027302830293030303130323033303430353036303730383039304030413042304330443045304630473048304930503051305230533054305530563057305830593060306130623063306430653066306730683069307030713072307330743075307630773078307930803081308230833084308530863087308830893090309130923093309430953096309730983099310031013102310331043105310631073108310931103111311231133114311531163117311831193120312131223123312431253126312731283129313031313132313331343135313631373138313931403141314231433144314531463147314831493150315131523153315431553156315731583159316031613162316331643165316631673168316931703171317231733174317531763177317831793180318131823183318431853186318731883189319031913192319331943195319631973198319932003201320232033204320532063207320832093210321132123213321432153216321732183219322032213222322332243225322632273228322932303231323232333234323532363237323832393240324132423243324432453246324732483249325032513252325332543255325632573258325932603261326232633264326532663267326832693270327132723273327432753276327732783279328032813282328332843285328632873288328932903291329232933294329532963297329832993300330133023303330433053306330733083309331033113312331333143315331633173318331933203321332233233324332533263327332833293330333133323333333433353336333733383339334033413342334333443345334633473348334933503351335233533354335533563357335833593360336133623363336433653366336733683369337033713372337333743375337633773378337933803381338233833384338533863387338833893390339133923393339433953396339733983399340034013402340334043405340634073408340934103411341234133414341534163417341834193420342134223423342434253426342734283429343034313432343334343435343634373438343934403441344234433444344534463447344834493450345134523453345434553456345734583459346034613462346334643465346634673468346934703471347234733474347534763477347834793480348134823483348434853486348734883489349034913492349334943495349634973498349935003501350235033504350535063507350835093510351135123513351435153516351735183519352035213522352335243525352635273528352935303531353235333534353535363537353835393540354135423543354435453546354735483549355035513552355335543555355635573558355935603561356235633564356535663567356835693570357135723573357435753576357735783579358035813582358335843585358635873588358935903591359235933594359535963597359835993600360136023603360436053606360736083609361036113612361336143615361636173618361936203621362236233624362536263627362836293630363136323633363436353636363736383639364036413642364336443645364636473648364936503651365236533654365536563657365836593660366136623663366436653666366736683669367036713672367336743675367636773678367936803681368236833684368536863687368836893690369136923693369436953696369736983699370037013702370337043705370637073708370937103711371237133714371537163717371837193720372137223723372437253726372737283729373037313732373337343735373637373738373937403741374237433744374537463747374837493750375137523753375437553756375737583759376037613762376337643765376637673768376937703771377237733774377537763777377837793780378137823783378437853786378737883789379037913792379337943795379637973798379938003801380238033804380538063807380838093810381138123813381438153816381738183819382038213822382338243825382638273828382938303831383238333834383538363837383838393840384138423843384438453846384738483849385038513852385338543855385638573858385938603861386238633864386538663867386838693870387138723873387438753876387738783879388038813882388338843885388638873888388938903891389238933894389538963897389838993900390139023903390439053906390739083909391039113912391339143915391639173918391939203921392239233924392539263927392839293930393139323933393439353936393739383939394039413942394339443945394639473948394939503951395239533954395539563957395839593960396139623963396439653966396739683969397039713972397339743975397639773978397939803981398239833984398539863987398839893990399139923993399439953996399739983999400040014002400340044005400640074008400940104011401240134014401540164017401840194020402140224023402440254026402740284029403040314032403340344035403640374038403940404041404240434044404540464047404840494050405140524053405440554056405740584059406040614062406340644065406640674068406940704071407240734074407540764077407840794080408140824083408440854086408740884089409040914092409340944095409640974098409941004101410241034104410541064107410841094110411141124113411441154116411741184119412041214122412341244125412641274128412941304131413241334134413541364137413841394140414141424143414441454146414741484149415041514152415341544155415641574158415941604161416241634164416541664167416841694170417141724173417441754176417741784179418041814182418341844185418641874188418941904191419241934194419541964197419841994200420142024203420442054206420742084209421042114212421342144215421642174218421942204221422242234224422542264227422842294230423142324233423442354236423742384239424042414242424342444245424642474248424942504251425242534254425542564257425842594260426142624263426442654266426742684269427042714272427342744275427642774278427942804281428242834284428542864287428842894290429142924293429442954296429742984299430043014302430343044305430643074308430943104311431243134314431543164317431843194320432143224323432443254326432743284329433043314332433343344335433643374338433943404341434243434344434543464347434843494350435143524353435443554356435743584359436043614362436343644365436643674368436943704371437243734374437543764377437843794380438143824383438443854386438743884389439043914392439343944395439643974398439944004401440244034404440544064407440844094410441144124413441444154416441744184419442044214422442344244425442644274428442944304431443244334434443544364437443844394440444144424443444444454446444744484449445044514452445344544455445644574458445944604461446244634464446544664467446844694470447144724473447444754476447744784479448044814482448344844485448644874488448944904491449244934494449544964497449844994500450145024503450445054506450745084509451045114512451345144515451645174518451945204521452245234524452545264527 |
- // SPDX-License-Identifier: GPL-2.0-only
- /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
- */
- #include <linux/bpf.h>
- #include <linux/bpf_trace.h>
- #include <linux/bpf_lirc.h>
- #include <linux/bpf_verifier.h>
- #include <linux/btf.h>
- #include <linux/syscalls.h>
- #include <linux/slab.h>
- #include <linux/sched/signal.h>
- #include <linux/vmalloc.h>
- #include <linux/mmzone.h>
- #include <linux/anon_inodes.h>
- #include <linux/fdtable.h>
- #include <linux/file.h>
- #include <linux/fs.h>
- #include <linux/license.h>
- #include <linux/filter.h>
- #include <linux/version.h>
- #include <linux/kernel.h>
- #include <linux/idr.h>
- #include <linux/cred.h>
- #include <linux/timekeeping.h>
- #include <linux/ctype.h>
- #include <linux/nospec.h>
- #include <linux/audit.h>
- #include <uapi/linux/btf.h>
- #include <linux/pgtable.h>
- #include <linux/bpf_lsm.h>
- #include <linux/poll.h>
- #include <linux/bpf-netns.h>
- #include <linux/rcupdate_trace.h>
- #include <trace/hooks/syscall_check.h>
- #define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
- (map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
- (map)->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
- #define IS_FD_PROG_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY)
- #define IS_FD_HASH(map) ((map)->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
- #define IS_FD_MAP(map) (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map) || \
- IS_FD_HASH(map))
- #define BPF_OBJ_FLAG_MASK (BPF_F_RDONLY | BPF_F_WRONLY)
- DEFINE_PER_CPU(int, bpf_prog_active);
- static DEFINE_IDR(prog_idr);
- static DEFINE_SPINLOCK(prog_idr_lock);
- static DEFINE_IDR(map_idr);
- static DEFINE_SPINLOCK(map_idr_lock);
- static DEFINE_IDR(link_idr);
- static DEFINE_SPINLOCK(link_idr_lock);
- int sysctl_unprivileged_bpf_disabled __read_mostly =
- IS_BUILTIN(CONFIG_BPF_UNPRIV_DEFAULT_OFF) ? 2 : 0;
- static const struct bpf_map_ops * const bpf_map_types[] = {
- #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
- #define BPF_MAP_TYPE(_id, _ops) \
- [_id] = &_ops,
- #define BPF_LINK_TYPE(_id, _name)
- #include <linux/bpf_types.h>
- #undef BPF_PROG_TYPE
- #undef BPF_MAP_TYPE
- #undef BPF_LINK_TYPE
- };
- /*
- * If we're handed a bigger struct than we know of, ensure all the unknown bits
- * are 0 - i.e. new user-space does not rely on any kernel feature extensions
- * we don't know about yet.
- *
- * There is a ToCToU between this function call and the following
- * copy_from_user() call. However, this is not a concern since this function is
- * meant to be a future-proofing of bits.
- */
- int bpf_check_uarg_tail_zero(void __user *uaddr,
- size_t expected_size,
- size_t actual_size)
- {
- unsigned char __user *addr = uaddr + expected_size;
- int res;
- if (unlikely(actual_size > PAGE_SIZE)) /* silly large */
- return -E2BIG;
- if (actual_size <= expected_size)
- return 0;
- res = check_zeroed_user(addr, actual_size - expected_size);
- if (res < 0)
- return res;
- return res ? 0 : -E2BIG;
- }
- const struct bpf_map_ops bpf_map_offload_ops = {
- .map_meta_equal = bpf_map_meta_equal,
- .map_alloc = bpf_map_offload_map_alloc,
- .map_free = bpf_map_offload_map_free,
- .map_check_btf = map_check_no_btf,
- };
- static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
- {
- const struct bpf_map_ops *ops;
- u32 type = attr->map_type;
- struct bpf_map *map;
- int err;
- if (type >= ARRAY_SIZE(bpf_map_types))
- return ERR_PTR(-EINVAL);
- type = array_index_nospec(type, ARRAY_SIZE(bpf_map_types));
- ops = bpf_map_types[type];
- if (!ops)
- return ERR_PTR(-EINVAL);
- if (ops->map_alloc_check) {
- err = ops->map_alloc_check(attr);
- if (err)
- return ERR_PTR(err);
- }
- if (attr->map_ifindex)
- ops = &bpf_map_offload_ops;
- map = ops->map_alloc(attr);
- if (IS_ERR(map))
- return map;
- map->ops = ops;
- map->map_type = type;
- return map;
- }
- static void bpf_map_write_active_inc(struct bpf_map *map)
- {
- atomic64_inc(&map->writecnt);
- }
- static void bpf_map_write_active_dec(struct bpf_map *map)
- {
- atomic64_dec(&map->writecnt);
- }
- bool bpf_map_write_active(const struct bpf_map *map)
- {
- return atomic64_read(&map->writecnt) != 0;
- }
- static u32 bpf_map_value_size(struct bpf_map *map)
- {
- if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
- map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
- map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
- map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
- return round_up(map->value_size, 8) * num_possible_cpus();
- else if (IS_FD_MAP(map))
- return sizeof(u32);
- else
- return map->value_size;
- }
- static void maybe_wait_bpf_programs(struct bpf_map *map)
- {
- /* Wait for any running BPF programs to complete so that
- * userspace, when we return to it, knows that all programs
- * that could be running use the new map value.
- */
- if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS ||
- map->map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS)
- synchronize_rcu();
- }
- static int bpf_map_update_value(struct bpf_map *map, struct fd f, void *key,
- void *value, __u64 flags)
- {
- int err;
- /* Need to create a kthread, thus must support schedule */
- if (bpf_map_is_dev_bound(map)) {
- return bpf_map_offload_update_elem(map, key, value, flags);
- } else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
- map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
- return map->ops->map_update_elem(map, key, value, flags);
- } else if (map->map_type == BPF_MAP_TYPE_SOCKHASH ||
- map->map_type == BPF_MAP_TYPE_SOCKMAP) {
- return sock_map_update_elem_sys(map, key, value, flags);
- } else if (IS_FD_PROG_ARRAY(map)) {
- return bpf_fd_array_map_update_elem(map, f.file, key, value,
- flags);
- }
- bpf_disable_instrumentation();
- if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
- map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
- err = bpf_percpu_hash_update(map, key, value, flags);
- } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
- err = bpf_percpu_array_update(map, key, value, flags);
- } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
- err = bpf_percpu_cgroup_storage_update(map, key, value,
- flags);
- } else if (IS_FD_ARRAY(map)) {
- rcu_read_lock();
- err = bpf_fd_array_map_update_elem(map, f.file, key, value,
- flags);
- rcu_read_unlock();
- } else if (map->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
- rcu_read_lock();
- err = bpf_fd_htab_map_update_elem(map, f.file, key, value,
- flags);
- rcu_read_unlock();
- } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
- /* rcu_read_lock() is not needed */
- err = bpf_fd_reuseport_array_update_elem(map, key, value,
- flags);
- } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
- map->map_type == BPF_MAP_TYPE_STACK) {
- err = map->ops->map_push_elem(map, value, flags);
- } else {
- rcu_read_lock();
- err = map->ops->map_update_elem(map, key, value, flags);
- rcu_read_unlock();
- }
- bpf_enable_instrumentation();
- maybe_wait_bpf_programs(map);
- return err;
- }
- static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value,
- __u64 flags)
- {
- void *ptr;
- int err;
- if (bpf_map_is_dev_bound(map))
- return bpf_map_offload_lookup_elem(map, key, value);
- bpf_disable_instrumentation();
- if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
- map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
- err = bpf_percpu_hash_copy(map, key, value);
- } else if (map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY) {
- err = bpf_percpu_array_copy(map, key, value);
- } else if (map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE) {
- err = bpf_percpu_cgroup_storage_copy(map, key, value);
- } else if (map->map_type == BPF_MAP_TYPE_STACK_TRACE) {
- err = bpf_stackmap_copy(map, key, value);
- } else if (IS_FD_ARRAY(map) || IS_FD_PROG_ARRAY(map)) {
- err = bpf_fd_array_map_lookup_elem(map, key, value);
- } else if (IS_FD_HASH(map)) {
- err = bpf_fd_htab_map_lookup_elem(map, key, value);
- } else if (map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
- err = bpf_fd_reuseport_array_lookup_elem(map, key, value);
- } else if (map->map_type == BPF_MAP_TYPE_QUEUE ||
- map->map_type == BPF_MAP_TYPE_STACK) {
- err = map->ops->map_peek_elem(map, value);
- } else if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
- /* struct_ops map requires directly updating "value" */
- err = bpf_struct_ops_map_sys_lookup_elem(map, key, value);
- } else {
- rcu_read_lock();
- if (map->ops->map_lookup_elem_sys_only)
- ptr = map->ops->map_lookup_elem_sys_only(map, key);
- else
- ptr = map->ops->map_lookup_elem(map, key);
- if (IS_ERR(ptr)) {
- err = PTR_ERR(ptr);
- } else if (!ptr) {
- err = -ENOENT;
- } else {
- err = 0;
- if (flags & BPF_F_LOCK)
- /* lock 'ptr' and copy everything but lock */
- copy_map_value_locked(map, value, ptr, true);
- else
- copy_map_value(map, value, ptr);
- /* mask lock, since value wasn't zero inited */
- check_and_init_map_lock(map, value);
- }
- rcu_read_unlock();
- }
- bpf_enable_instrumentation();
- maybe_wait_bpf_programs(map);
- return err;
- }
- static void *__bpf_map_area_alloc(u64 size, int numa_node, bool mmapable)
- {
- /* We really just want to fail instead of triggering OOM killer
- * under memory pressure, therefore we set __GFP_NORETRY to kmalloc,
- * which is used for lower order allocation requests.
- *
- * It has been observed that higher order allocation requests done by
- * vmalloc with __GFP_NORETRY being set might fail due to not trying
- * to reclaim memory from the page cache, thus we set
- * __GFP_RETRY_MAYFAIL to avoid such situations.
- */
- const gfp_t gfp = __GFP_NOWARN | __GFP_ZERO;
- unsigned int flags = 0;
- unsigned long align = 1;
- void *area;
- if (size >= SIZE_MAX)
- return NULL;
- /* kmalloc()'ed memory can't be mmap()'ed */
- if (mmapable) {
- BUG_ON(!PAGE_ALIGNED(size));
- align = SHMLBA;
- flags = VM_USERMAP;
- } else if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
- area = kmalloc_node(size, gfp | GFP_USER | __GFP_NORETRY,
- numa_node);
- if (area != NULL)
- return area;
- }
- return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
- gfp | GFP_KERNEL | __GFP_RETRY_MAYFAIL, PAGE_KERNEL,
- flags, numa_node, __builtin_return_address(0));
- }
- void *bpf_map_area_alloc(u64 size, int numa_node)
- {
- return __bpf_map_area_alloc(size, numa_node, false);
- }
- void *bpf_map_area_mmapable_alloc(u64 size, int numa_node)
- {
- return __bpf_map_area_alloc(size, numa_node, true);
- }
- void bpf_map_area_free(void *area)
- {
- kvfree(area);
- }
- static u32 bpf_map_flags_retain_permanent(u32 flags)
- {
- /* Some map creation flags are not tied to the map object but
- * rather to the map fd instead, so they have no meaning upon
- * map object inspection since multiple file descriptors with
- * different (access) properties can exist here. Thus, given
- * this has zero meaning for the map itself, lets clear these
- * from here.
- */
- return flags & ~(BPF_F_RDONLY | BPF_F_WRONLY);
- }
- void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr)
- {
- map->map_type = attr->map_type;
- map->key_size = attr->key_size;
- map->value_size = attr->value_size;
- map->max_entries = attr->max_entries;
- map->map_flags = bpf_map_flags_retain_permanent(attr->map_flags);
- map->numa_node = bpf_map_attr_numa_node(attr);
- }
- static int bpf_charge_memlock(struct user_struct *user, u32 pages)
- {
- unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
- if (atomic_long_add_return(pages, &user->locked_vm) > memlock_limit) {
- atomic_long_sub(pages, &user->locked_vm);
- return -EPERM;
- }
- return 0;
- }
- static void bpf_uncharge_memlock(struct user_struct *user, u32 pages)
- {
- if (user)
- atomic_long_sub(pages, &user->locked_vm);
- }
- int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size)
- {
- u32 pages = round_up(size, PAGE_SIZE) >> PAGE_SHIFT;
- struct user_struct *user;
- int ret;
- if (size >= U32_MAX - PAGE_SIZE)
- return -E2BIG;
- user = get_current_user();
- ret = bpf_charge_memlock(user, pages);
- if (ret) {
- free_uid(user);
- return ret;
- }
- mem->pages = pages;
- mem->user = user;
- return 0;
- }
- void bpf_map_charge_finish(struct bpf_map_memory *mem)
- {
- bpf_uncharge_memlock(mem->user, mem->pages);
- free_uid(mem->user);
- }
- void bpf_map_charge_move(struct bpf_map_memory *dst,
- struct bpf_map_memory *src)
- {
- *dst = *src;
- /* Make sure src will not be used for the redundant uncharging. */
- memset(src, 0, sizeof(struct bpf_map_memory));
- }
- int bpf_map_charge_memlock(struct bpf_map *map, u32 pages)
- {
- int ret;
- ret = bpf_charge_memlock(map->memory.user, pages);
- if (ret)
- return ret;
- map->memory.pages += pages;
- return ret;
- }
- void bpf_map_uncharge_memlock(struct bpf_map *map, u32 pages)
- {
- bpf_uncharge_memlock(map->memory.user, pages);
- map->memory.pages -= pages;
- }
- static int bpf_map_alloc_id(struct bpf_map *map)
- {
- int id;
- idr_preload(GFP_KERNEL);
- spin_lock_bh(&map_idr_lock);
- id = idr_alloc_cyclic(&map_idr, map, 1, INT_MAX, GFP_ATOMIC);
- if (id > 0)
- map->id = id;
- spin_unlock_bh(&map_idr_lock);
- idr_preload_end();
- if (WARN_ON_ONCE(!id))
- return -ENOSPC;
- return id > 0 ? 0 : id;
- }
- void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
- {
- unsigned long flags;
- /* Offloaded maps are removed from the IDR store when their device
- * disappears - even if someone holds an fd to them they are unusable,
- * the memory is gone, all ops will fail; they are simply waiting for
- * refcnt to drop to be freed.
- */
- if (!map->id)
- return;
- if (do_idr_lock)
- spin_lock_irqsave(&map_idr_lock, flags);
- else
- __acquire(&map_idr_lock);
- idr_remove(&map_idr, map->id);
- map->id = 0;
- if (do_idr_lock)
- spin_unlock_irqrestore(&map_idr_lock, flags);
- else
- __release(&map_idr_lock);
- }
- /* called from workqueue */
- static void bpf_map_free_deferred(struct work_struct *work)
- {
- struct bpf_map *map = container_of(work, struct bpf_map, work);
- struct bpf_map_memory mem;
- bpf_map_charge_move(&mem, &map->memory);
- security_bpf_map_free(map);
- /* implementation dependent freeing */
- map->ops->map_free(map);
- bpf_map_charge_finish(&mem);
- }
- static void bpf_map_put_uref(struct bpf_map *map)
- {
- if (atomic64_dec_and_test(&map->usercnt)) {
- if (map->ops->map_release_uref)
- map->ops->map_release_uref(map);
- }
- }
- /* decrement map refcnt and schedule it for freeing via workqueue
- * (unrelying map implementation ops->map_free() might sleep)
- */
- static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
- {
- if (atomic64_dec_and_test(&map->refcnt)) {
- /* bpf_map_free_id() must be called first */
- bpf_map_free_id(map, do_idr_lock);
- btf_put(map->btf);
- INIT_WORK(&map->work, bpf_map_free_deferred);
- schedule_work(&map->work);
- }
- }
- void bpf_map_put(struct bpf_map *map)
- {
- __bpf_map_put(map, true);
- }
- EXPORT_SYMBOL_GPL(bpf_map_put);
- void bpf_map_put_with_uref(struct bpf_map *map)
- {
- bpf_map_put_uref(map);
- bpf_map_put(map);
- }
- static int bpf_map_release(struct inode *inode, struct file *filp)
- {
- struct bpf_map *map = filp->private_data;
- if (map->ops->map_release)
- map->ops->map_release(map, filp);
- bpf_map_put_with_uref(map);
- return 0;
- }
- static fmode_t map_get_sys_perms(struct bpf_map *map, struct fd f)
- {
- fmode_t mode = f.file->f_mode;
- /* Our file permissions may have been overridden by global
- * map permissions facing syscall side.
- */
- if (READ_ONCE(map->frozen))
- mode &= ~FMODE_CAN_WRITE;
- return mode;
- }
- #ifdef CONFIG_PROC_FS
- static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
- {
- const struct bpf_map *map = filp->private_data;
- const struct bpf_array *array;
- u32 type = 0, jited = 0;
- if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) {
- array = container_of(map, struct bpf_array, map);
- spin_lock(&array->aux->owner.lock);
- type = array->aux->owner.type;
- jited = array->aux->owner.jited;
- spin_unlock(&array->aux->owner.lock);
- }
- seq_printf(m,
- "map_type:\t%u\n"
- "key_size:\t%u\n"
- "value_size:\t%u\n"
- "max_entries:\t%u\n"
- "map_flags:\t%#x\n"
- "memlock:\t%llu\n"
- "map_id:\t%u\n"
- "frozen:\t%u\n",
- map->map_type,
- map->key_size,
- map->value_size,
- map->max_entries,
- map->map_flags,
- map->memory.pages * 1ULL << PAGE_SHIFT,
- map->id,
- READ_ONCE(map->frozen));
- if (type) {
- seq_printf(m, "owner_prog_type:\t%u\n", type);
- seq_printf(m, "owner_jited:\t%u\n", jited);
- }
- }
- #endif
- static ssize_t bpf_dummy_read(struct file *filp, char __user *buf, size_t siz,
- loff_t *ppos)
- {
- /* We need this handler such that alloc_file() enables
- * f_mode with FMODE_CAN_READ.
- */
- return -EINVAL;
- }
- static ssize_t bpf_dummy_write(struct file *filp, const char __user *buf,
- size_t siz, loff_t *ppos)
- {
- /* We need this handler such that alloc_file() enables
- * f_mode with FMODE_CAN_WRITE.
- */
- return -EINVAL;
- }
- /* called for any extra memory-mapped regions (except initial) */
- static void bpf_map_mmap_open(struct vm_area_struct *vma)
- {
- struct bpf_map *map = vma->vm_file->private_data;
- if (vma->vm_flags & VM_MAYWRITE)
- bpf_map_write_active_inc(map);
- }
- /* called for all unmapped memory region (including initial) */
- static void bpf_map_mmap_close(struct vm_area_struct *vma)
- {
- struct bpf_map *map = vma->vm_file->private_data;
- if (vma->vm_flags & VM_MAYWRITE)
- bpf_map_write_active_dec(map);
- }
- static const struct vm_operations_struct bpf_map_default_vmops = {
- .open = bpf_map_mmap_open,
- .close = bpf_map_mmap_close,
- };
- static int bpf_map_mmap(struct file *filp, struct vm_area_struct *vma)
- {
- struct bpf_map *map = filp->private_data;
- int err;
- if (!map->ops->map_mmap || map_value_has_spin_lock(map))
- return -ENOTSUPP;
- if (!(vma->vm_flags & VM_SHARED))
- return -EINVAL;
- mutex_lock(&map->freeze_mutex);
- if (vma->vm_flags & VM_WRITE) {
- if (map->frozen) {
- err = -EPERM;
- goto out;
- }
- /* map is meant to be read-only, so do not allow mapping as
- * writable, because it's possible to leak a writable page
- * reference and allows user-space to still modify it after
- * freezing, while verifier will assume contents do not change
- */
- if (map->map_flags & BPF_F_RDONLY_PROG) {
- err = -EACCES;
- goto out;
- }
- }
- /* set default open/close callbacks */
- vma->vm_ops = &bpf_map_default_vmops;
- vma->vm_private_data = map;
- vma->vm_flags &= ~VM_MAYEXEC;
- if (!(vma->vm_flags & VM_WRITE))
- /* disallow re-mapping with PROT_WRITE */
- vma->vm_flags &= ~VM_MAYWRITE;
- err = map->ops->map_mmap(map, vma);
- if (err)
- goto out;
- if (vma->vm_flags & VM_MAYWRITE)
- bpf_map_write_active_inc(map);
- out:
- mutex_unlock(&map->freeze_mutex);
- return err;
- }
- static __poll_t bpf_map_poll(struct file *filp, struct poll_table_struct *pts)
- {
- struct bpf_map *map = filp->private_data;
- if (map->ops->map_poll)
- return map->ops->map_poll(map, filp, pts);
- return EPOLLERR;
- }
- const struct file_operations bpf_map_fops = {
- #ifdef CONFIG_PROC_FS
- .show_fdinfo = bpf_map_show_fdinfo,
- #endif
- .release = bpf_map_release,
- .read = bpf_dummy_read,
- .write = bpf_dummy_write,
- .mmap = bpf_map_mmap,
- .poll = bpf_map_poll,
- };
- int bpf_map_new_fd(struct bpf_map *map, int flags)
- {
- int ret;
- ret = security_bpf_map(map, OPEN_FMODE(flags));
- if (ret < 0)
- return ret;
- return anon_inode_getfd("bpf-map", &bpf_map_fops, map,
- flags | O_CLOEXEC);
- }
- int bpf_get_file_flag(int flags)
- {
- if ((flags & BPF_F_RDONLY) && (flags & BPF_F_WRONLY))
- return -EINVAL;
- if (flags & BPF_F_RDONLY)
- return O_RDONLY;
- if (flags & BPF_F_WRONLY)
- return O_WRONLY;
- return O_RDWR;
- }
- /* helper macro to check that unused fields 'union bpf_attr' are zero */
- #define CHECK_ATTR(CMD) \
- memchr_inv((void *) &attr->CMD##_LAST_FIELD + \
- sizeof(attr->CMD##_LAST_FIELD), 0, \
- sizeof(*attr) - \
- offsetof(union bpf_attr, CMD##_LAST_FIELD) - \
- sizeof(attr->CMD##_LAST_FIELD)) != NULL
- /* dst and src must have at least "size" number of bytes.
- * Return strlen on success and < 0 on error.
- */
- int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size)
- {
- const char *end = src + size;
- const char *orig_src = src;
- memset(dst, 0, size);
- /* Copy all isalnum(), '_' and '.' chars. */
- while (src < end && *src) {
- if (!isalnum(*src) &&
- *src != '_' && *src != '.')
- return -EINVAL;
- *dst++ = *src++;
- }
- /* No '\0' found in "size" number of bytes */
- if (src == end)
- return -EINVAL;
- return src - orig_src;
- }
- int map_check_no_btf(const struct bpf_map *map,
- const struct btf *btf,
- const struct btf_type *key_type,
- const struct btf_type *value_type)
- {
- return -ENOTSUPP;
- }
- static int map_check_btf(struct bpf_map *map, const struct btf *btf,
- u32 btf_key_id, u32 btf_value_id)
- {
- const struct btf_type *key_type, *value_type;
- u32 key_size, value_size;
- int ret = 0;
- /* Some maps allow key to be unspecified. */
- if (btf_key_id) {
- key_type = btf_type_id_size(btf, &btf_key_id, &key_size);
- if (!key_type || key_size != map->key_size)
- return -EINVAL;
- } else {
- key_type = btf_type_by_id(btf, 0);
- if (!map->ops->map_check_btf)
- return -EINVAL;
- }
- value_type = btf_type_id_size(btf, &btf_value_id, &value_size);
- if (!value_type || value_size != map->value_size)
- return -EINVAL;
- map->spin_lock_off = btf_find_spin_lock(btf, value_type);
- if (map_value_has_spin_lock(map)) {
- if (map->map_flags & BPF_F_RDONLY_PROG)
- return -EACCES;
- if (map->map_type != BPF_MAP_TYPE_HASH &&
- map->map_type != BPF_MAP_TYPE_ARRAY &&
- map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
- map->map_type != BPF_MAP_TYPE_SK_STORAGE &&
- map->map_type != BPF_MAP_TYPE_INODE_STORAGE)
- return -ENOTSUPP;
- if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
- map->value_size) {
- WARN_ONCE(1,
- "verifier bug spin_lock_off %d value_size %d\n",
- map->spin_lock_off, map->value_size);
- return -EFAULT;
- }
- }
- if (map->ops->map_check_btf)
- ret = map->ops->map_check_btf(map, btf, key_type, value_type);
- return ret;
- }
- #define BPF_MAP_CREATE_LAST_FIELD btf_vmlinux_value_type_id
- /* called via syscall */
- static int map_create(union bpf_attr *attr)
- {
- int numa_node = bpf_map_attr_numa_node(attr);
- struct bpf_map_memory mem;
- struct bpf_map *map;
- int f_flags;
- int err;
- err = CHECK_ATTR(BPF_MAP_CREATE);
- if (err)
- return -EINVAL;
- if (attr->btf_vmlinux_value_type_id) {
- if (attr->map_type != BPF_MAP_TYPE_STRUCT_OPS ||
- attr->btf_key_type_id || attr->btf_value_type_id)
- return -EINVAL;
- } else if (attr->btf_key_type_id && !attr->btf_value_type_id) {
- return -EINVAL;
- }
- f_flags = bpf_get_file_flag(attr->map_flags);
- if (f_flags < 0)
- return f_flags;
- if (numa_node != NUMA_NO_NODE &&
- ((unsigned int)numa_node >= nr_node_ids ||
- !node_online(numa_node)))
- return -EINVAL;
- /* find map type and init map: hashtable vs rbtree vs bloom vs ... */
- map = find_and_alloc_map(attr);
- if (IS_ERR(map))
- return PTR_ERR(map);
- err = bpf_obj_name_cpy(map->name, attr->map_name,
- sizeof(attr->map_name));
- if (err < 0)
- goto free_map;
- atomic64_set(&map->refcnt, 1);
- atomic64_set(&map->usercnt, 1);
- mutex_init(&map->freeze_mutex);
- map->spin_lock_off = -EINVAL;
- if (attr->btf_key_type_id || attr->btf_value_type_id ||
- /* Even the map's value is a kernel's struct,
- * the bpf_prog.o must have BTF to begin with
- * to figure out the corresponding kernel's
- * counter part. Thus, attr->btf_fd has
- * to be valid also.
- */
- attr->btf_vmlinux_value_type_id) {
- struct btf *btf;
- btf = btf_get_by_fd(attr->btf_fd);
- if (IS_ERR(btf)) {
- err = PTR_ERR(btf);
- goto free_map;
- }
- map->btf = btf;
- if (attr->btf_value_type_id) {
- err = map_check_btf(map, btf, attr->btf_key_type_id,
- attr->btf_value_type_id);
- if (err)
- goto free_map;
- }
- map->btf_key_type_id = attr->btf_key_type_id;
- map->btf_value_type_id = attr->btf_value_type_id;
- map->btf_vmlinux_value_type_id =
- attr->btf_vmlinux_value_type_id;
- }
- err = security_bpf_map_alloc(map);
- if (err)
- goto free_map;
- err = bpf_map_alloc_id(map);
- if (err)
- goto free_map_sec;
- err = bpf_map_new_fd(map, f_flags);
- if (err < 0) {
- /* failed to allocate fd.
- * bpf_map_put_with_uref() is needed because the above
- * bpf_map_alloc_id() has published the map
- * to the userspace and the userspace may
- * have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
- */
- bpf_map_put_with_uref(map);
- return err;
- }
- return err;
- free_map_sec:
- security_bpf_map_free(map);
- free_map:
- btf_put(map->btf);
- bpf_map_charge_move(&mem, &map->memory);
- map->ops->map_free(map);
- bpf_map_charge_finish(&mem);
- return err;
- }
- /* if error is returned, fd is released.
- * On success caller should complete fd access with matching fdput()
- */
- struct bpf_map *__bpf_map_get(struct fd f)
- {
- if (!f.file)
- return ERR_PTR(-EBADF);
- if (f.file->f_op != &bpf_map_fops) {
- fdput(f);
- return ERR_PTR(-EINVAL);
- }
- return f.file->private_data;
- }
- void bpf_map_inc(struct bpf_map *map)
- {
- atomic64_inc(&map->refcnt);
- }
- EXPORT_SYMBOL_GPL(bpf_map_inc);
- void bpf_map_inc_with_uref(struct bpf_map *map)
- {
- atomic64_inc(&map->refcnt);
- atomic64_inc(&map->usercnt);
- }
- EXPORT_SYMBOL_GPL(bpf_map_inc_with_uref);
- struct bpf_map *bpf_map_get(u32 ufd)
- {
- struct fd f = fdget(ufd);
- struct bpf_map *map;
- map = __bpf_map_get(f);
- if (IS_ERR(map))
- return map;
- bpf_map_inc(map);
- fdput(f);
- return map;
- }
- struct bpf_map *bpf_map_get_with_uref(u32 ufd)
- {
- struct fd f = fdget(ufd);
- struct bpf_map *map;
- map = __bpf_map_get(f);
- if (IS_ERR(map))
- return map;
- bpf_map_inc_with_uref(map);
- fdput(f);
- return map;
- }
- /* map_idr_lock should have been held */
- static struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref)
- {
- int refold;
- refold = atomic64_fetch_add_unless(&map->refcnt, 1, 0);
- if (!refold)
- return ERR_PTR(-ENOENT);
- if (uref)
- atomic64_inc(&map->usercnt);
- return map;
- }
- struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map)
- {
- spin_lock_bh(&map_idr_lock);
- map = __bpf_map_inc_not_zero(map, false);
- spin_unlock_bh(&map_idr_lock);
- return map;
- }
- EXPORT_SYMBOL_GPL(bpf_map_inc_not_zero);
- int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
- {
- return -ENOTSUPP;
- }
- static void *__bpf_copy_key(void __user *ukey, u64 key_size)
- {
- if (key_size)
- return memdup_user(ukey, key_size);
- if (ukey)
- return ERR_PTR(-EINVAL);
- return NULL;
- }
- /* last field in 'union bpf_attr' used by this command */
- #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD flags
- static int map_lookup_elem(union bpf_attr *attr)
- {
- void __user *ukey = u64_to_user_ptr(attr->key);
- void __user *uvalue = u64_to_user_ptr(attr->value);
- int ufd = attr->map_fd;
- struct bpf_map *map;
- void *key, *value;
- u32 value_size;
- struct fd f;
- int err;
- if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM))
- return -EINVAL;
- if (attr->flags & ~BPF_F_LOCK)
- return -EINVAL;
- f = fdget(ufd);
- map = __bpf_map_get(f);
- if (IS_ERR(map))
- return PTR_ERR(map);
- if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
- err = -EPERM;
- goto err_put;
- }
- if ((attr->flags & BPF_F_LOCK) &&
- !map_value_has_spin_lock(map)) {
- err = -EINVAL;
- goto err_put;
- }
- key = __bpf_copy_key(ukey, map->key_size);
- if (IS_ERR(key)) {
- err = PTR_ERR(key);
- goto err_put;
- }
- value_size = bpf_map_value_size(map);
- err = -ENOMEM;
- value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
- if (!value)
- goto free_key;
- err = bpf_map_copy_value(map, key, value, attr->flags);
- if (err)
- goto free_value;
- err = -EFAULT;
- if (copy_to_user(uvalue, value, value_size) != 0)
- goto free_value;
- err = 0;
- free_value:
- kfree(value);
- free_key:
- kfree(key);
- err_put:
- fdput(f);
- return err;
- }
- #define BPF_MAP_UPDATE_ELEM_LAST_FIELD flags
- static int map_update_elem(union bpf_attr *attr)
- {
- void __user *ukey = u64_to_user_ptr(attr->key);
- void __user *uvalue = u64_to_user_ptr(attr->value);
- int ufd = attr->map_fd;
- struct bpf_map *map;
- void *key, *value;
- u32 value_size;
- struct fd f;
- int err;
- if (CHECK_ATTR(BPF_MAP_UPDATE_ELEM))
- return -EINVAL;
- f = fdget(ufd);
- map = __bpf_map_get(f);
- if (IS_ERR(map))
- return PTR_ERR(map);
- bpf_map_write_active_inc(map);
- if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
- err = -EPERM;
- goto err_put;
- }
- if ((attr->flags & BPF_F_LOCK) &&
- !map_value_has_spin_lock(map)) {
- err = -EINVAL;
- goto err_put;
- }
- key = __bpf_copy_key(ukey, map->key_size);
- if (IS_ERR(key)) {
- err = PTR_ERR(key);
- goto err_put;
- }
- if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
- map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
- map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY ||
- map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE)
- value_size = round_up(map->value_size, 8) * num_possible_cpus();
- else
- value_size = map->value_size;
- err = -ENOMEM;
- value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
- if (!value)
- goto free_key;
- err = -EFAULT;
- if (copy_from_user(value, uvalue, value_size) != 0)
- goto free_value;
- err = bpf_map_update_value(map, f, key, value, attr->flags);
- free_value:
- kfree(value);
- free_key:
- kfree(key);
- err_put:
- bpf_map_write_active_dec(map);
- fdput(f);
- return err;
- }
- #define BPF_MAP_DELETE_ELEM_LAST_FIELD key
- static int map_delete_elem(union bpf_attr *attr)
- {
- void __user *ukey = u64_to_user_ptr(attr->key);
- int ufd = attr->map_fd;
- struct bpf_map *map;
- struct fd f;
- void *key;
- int err;
- if (CHECK_ATTR(BPF_MAP_DELETE_ELEM))
- return -EINVAL;
- f = fdget(ufd);
- map = __bpf_map_get(f);
- if (IS_ERR(map))
- return PTR_ERR(map);
- bpf_map_write_active_inc(map);
- if (!(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
- err = -EPERM;
- goto err_put;
- }
- key = __bpf_copy_key(ukey, map->key_size);
- if (IS_ERR(key)) {
- err = PTR_ERR(key);
- goto err_put;
- }
- if (bpf_map_is_dev_bound(map)) {
- err = bpf_map_offload_delete_elem(map, key);
- goto out;
- } else if (IS_FD_PROG_ARRAY(map) ||
- map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
- /* These maps require sleepable context */
- err = map->ops->map_delete_elem(map, key);
- goto out;
- }
- bpf_disable_instrumentation();
- rcu_read_lock();
- err = map->ops->map_delete_elem(map, key);
- rcu_read_unlock();
- bpf_enable_instrumentation();
- maybe_wait_bpf_programs(map);
- out:
- kfree(key);
- err_put:
- bpf_map_write_active_dec(map);
- fdput(f);
- return err;
- }
- /* last field in 'union bpf_attr' used by this command */
- #define BPF_MAP_GET_NEXT_KEY_LAST_FIELD next_key
- static int map_get_next_key(union bpf_attr *attr)
- {
- void __user *ukey = u64_to_user_ptr(attr->key);
- void __user *unext_key = u64_to_user_ptr(attr->next_key);
- int ufd = attr->map_fd;
- struct bpf_map *map;
- void *key, *next_key;
- struct fd f;
- int err;
- if (CHECK_ATTR(BPF_MAP_GET_NEXT_KEY))
- return -EINVAL;
- f = fdget(ufd);
- map = __bpf_map_get(f);
- if (IS_ERR(map))
- return PTR_ERR(map);
- if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
- err = -EPERM;
- goto err_put;
- }
- if (ukey) {
- key = __bpf_copy_key(ukey, map->key_size);
- if (IS_ERR(key)) {
- err = PTR_ERR(key);
- goto err_put;
- }
- } else {
- key = NULL;
- }
- err = -ENOMEM;
- next_key = kmalloc(map->key_size, GFP_USER);
- if (!next_key)
- goto free_key;
- if (bpf_map_is_dev_bound(map)) {
- err = bpf_map_offload_get_next_key(map, key, next_key);
- goto out;
- }
- rcu_read_lock();
- err = map->ops->map_get_next_key(map, key, next_key);
- rcu_read_unlock();
- out:
- if (err)
- goto free_next_key;
- err = -EFAULT;
- if (copy_to_user(unext_key, next_key, map->key_size) != 0)
- goto free_next_key;
- err = 0;
- free_next_key:
- kfree(next_key);
- free_key:
- kfree(key);
- err_put:
- fdput(f);
- return err;
- }
- int generic_map_delete_batch(struct bpf_map *map,
- const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- void __user *keys = u64_to_user_ptr(attr->batch.keys);
- u32 cp, max_count;
- int err = 0;
- void *key;
- if (attr->batch.elem_flags & ~BPF_F_LOCK)
- return -EINVAL;
- if ((attr->batch.elem_flags & BPF_F_LOCK) &&
- !map_value_has_spin_lock(map)) {
- return -EINVAL;
- }
- max_count = attr->batch.count;
- if (!max_count)
- return 0;
- key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
- if (!key)
- return -ENOMEM;
- for (cp = 0; cp < max_count; cp++) {
- err = -EFAULT;
- if (copy_from_user(key, keys + cp * map->key_size,
- map->key_size))
- break;
- if (bpf_map_is_dev_bound(map)) {
- err = bpf_map_offload_delete_elem(map, key);
- break;
- }
- bpf_disable_instrumentation();
- rcu_read_lock();
- err = map->ops->map_delete_elem(map, key);
- rcu_read_unlock();
- bpf_enable_instrumentation();
- maybe_wait_bpf_programs(map);
- if (err)
- break;
- cond_resched();
- }
- if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
- err = -EFAULT;
- kfree(key);
- return err;
- }
- int generic_map_update_batch(struct bpf_map *map,
- const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- void __user *values = u64_to_user_ptr(attr->batch.values);
- void __user *keys = u64_to_user_ptr(attr->batch.keys);
- u32 value_size, cp, max_count;
- int ufd = attr->batch.map_fd;
- void *key, *value;
- struct fd f;
- int err = 0;
- if (attr->batch.elem_flags & ~BPF_F_LOCK)
- return -EINVAL;
- if ((attr->batch.elem_flags & BPF_F_LOCK) &&
- !map_value_has_spin_lock(map)) {
- return -EINVAL;
- }
- value_size = bpf_map_value_size(map);
- max_count = attr->batch.count;
- if (!max_count)
- return 0;
- key = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
- if (!key)
- return -ENOMEM;
- value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
- if (!value) {
- kfree(key);
- return -ENOMEM;
- }
- f = fdget(ufd); /* bpf_map_do_batch() guarantees ufd is valid */
- for (cp = 0; cp < max_count; cp++) {
- err = -EFAULT;
- if (copy_from_user(key, keys + cp * map->key_size,
- map->key_size) ||
- copy_from_user(value, values + cp * value_size, value_size))
- break;
- err = bpf_map_update_value(map, f, key, value,
- attr->batch.elem_flags);
- if (err)
- break;
- cond_resched();
- }
- if (copy_to_user(&uattr->batch.count, &cp, sizeof(cp)))
- err = -EFAULT;
- kfree(value);
- kfree(key);
- fdput(f);
- return err;
- }
- #define MAP_LOOKUP_RETRIES 3
- int generic_map_lookup_batch(struct bpf_map *map,
- const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- void __user *uobatch = u64_to_user_ptr(attr->batch.out_batch);
- void __user *ubatch = u64_to_user_ptr(attr->batch.in_batch);
- void __user *values = u64_to_user_ptr(attr->batch.values);
- void __user *keys = u64_to_user_ptr(attr->batch.keys);
- void *buf, *buf_prevkey, *prev_key, *key, *value;
- int err, retry = MAP_LOOKUP_RETRIES;
- u32 value_size, cp, max_count;
- if (attr->batch.elem_flags & ~BPF_F_LOCK)
- return -EINVAL;
- if ((attr->batch.elem_flags & BPF_F_LOCK) &&
- !map_value_has_spin_lock(map))
- return -EINVAL;
- value_size = bpf_map_value_size(map);
- max_count = attr->batch.count;
- if (!max_count)
- return 0;
- if (put_user(0, &uattr->batch.count))
- return -EFAULT;
- buf_prevkey = kmalloc(map->key_size, GFP_USER | __GFP_NOWARN);
- if (!buf_prevkey)
- return -ENOMEM;
- buf = kmalloc(map->key_size + value_size, GFP_USER | __GFP_NOWARN);
- if (!buf) {
- kfree(buf_prevkey);
- return -ENOMEM;
- }
- err = -EFAULT;
- prev_key = NULL;
- if (ubatch && copy_from_user(buf_prevkey, ubatch, map->key_size))
- goto free_buf;
- key = buf;
- value = key + map->key_size;
- if (ubatch)
- prev_key = buf_prevkey;
- for (cp = 0; cp < max_count;) {
- rcu_read_lock();
- err = map->ops->map_get_next_key(map, prev_key, key);
- rcu_read_unlock();
- if (err)
- break;
- err = bpf_map_copy_value(map, key, value,
- attr->batch.elem_flags);
- if (err == -ENOENT) {
- if (retry) {
- retry--;
- continue;
- }
- err = -EINTR;
- break;
- }
- if (err)
- goto free_buf;
- if (copy_to_user(keys + cp * map->key_size, key,
- map->key_size)) {
- err = -EFAULT;
- goto free_buf;
- }
- if (copy_to_user(values + cp * value_size, value, value_size)) {
- err = -EFAULT;
- goto free_buf;
- }
- if (!prev_key)
- prev_key = buf_prevkey;
- swap(prev_key, key);
- retry = MAP_LOOKUP_RETRIES;
- cp++;
- cond_resched();
- }
- if (err == -EFAULT)
- goto free_buf;
- if ((copy_to_user(&uattr->batch.count, &cp, sizeof(cp)) ||
- (cp && copy_to_user(uobatch, prev_key, map->key_size))))
- err = -EFAULT;
- free_buf:
- kfree(buf_prevkey);
- kfree(buf);
- return err;
- }
- #define BPF_MAP_LOOKUP_AND_DELETE_ELEM_LAST_FIELD value
- static int map_lookup_and_delete_elem(union bpf_attr *attr)
- {
- void __user *ukey = u64_to_user_ptr(attr->key);
- void __user *uvalue = u64_to_user_ptr(attr->value);
- int ufd = attr->map_fd;
- struct bpf_map *map;
- void *key, *value;
- u32 value_size;
- struct fd f;
- int err;
- if (CHECK_ATTR(BPF_MAP_LOOKUP_AND_DELETE_ELEM))
- return -EINVAL;
- f = fdget(ufd);
- map = __bpf_map_get(f);
- if (IS_ERR(map))
- return PTR_ERR(map);
- bpf_map_write_active_inc(map);
- if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ) ||
- !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
- err = -EPERM;
- goto err_put;
- }
- key = __bpf_copy_key(ukey, map->key_size);
- if (IS_ERR(key)) {
- err = PTR_ERR(key);
- goto err_put;
- }
- value_size = map->value_size;
- err = -ENOMEM;
- value = kmalloc(value_size, GFP_USER | __GFP_NOWARN);
- if (!value)
- goto free_key;
- if (map->map_type == BPF_MAP_TYPE_QUEUE ||
- map->map_type == BPF_MAP_TYPE_STACK) {
- err = map->ops->map_pop_elem(map, value);
- } else {
- err = -ENOTSUPP;
- }
- if (err)
- goto free_value;
- if (copy_to_user(uvalue, value, value_size) != 0) {
- err = -EFAULT;
- goto free_value;
- }
- err = 0;
- free_value:
- kfree(value);
- free_key:
- kfree(key);
- err_put:
- bpf_map_write_active_dec(map);
- fdput(f);
- return err;
- }
- #define BPF_MAP_FREEZE_LAST_FIELD map_fd
- static int map_freeze(const union bpf_attr *attr)
- {
- int err = 0, ufd = attr->map_fd;
- struct bpf_map *map;
- struct fd f;
- if (CHECK_ATTR(BPF_MAP_FREEZE))
- return -EINVAL;
- f = fdget(ufd);
- map = __bpf_map_get(f);
- if (IS_ERR(map))
- return PTR_ERR(map);
- if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
- fdput(f);
- return -ENOTSUPP;
- }
- mutex_lock(&map->freeze_mutex);
- if (bpf_map_write_active(map)) {
- err = -EBUSY;
- goto err_put;
- }
- if (READ_ONCE(map->frozen)) {
- err = -EBUSY;
- goto err_put;
- }
- if (!bpf_capable()) {
- err = -EPERM;
- goto err_put;
- }
- WRITE_ONCE(map->frozen, true);
- err_put:
- mutex_unlock(&map->freeze_mutex);
- fdput(f);
- return err;
- }
- static const struct bpf_prog_ops * const bpf_prog_types[] = {
- #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
- [_id] = & _name ## _prog_ops,
- #define BPF_MAP_TYPE(_id, _ops)
- #define BPF_LINK_TYPE(_id, _name)
- #include <linux/bpf_types.h>
- #undef BPF_PROG_TYPE
- #undef BPF_MAP_TYPE
- #undef BPF_LINK_TYPE
- };
- static int find_prog_type(enum bpf_prog_type type, struct bpf_prog *prog)
- {
- const struct bpf_prog_ops *ops;
- if (type >= ARRAY_SIZE(bpf_prog_types))
- return -EINVAL;
- type = array_index_nospec(type, ARRAY_SIZE(bpf_prog_types));
- ops = bpf_prog_types[type];
- if (!ops)
- return -EINVAL;
- if (!bpf_prog_is_dev_bound(prog->aux))
- prog->aux->ops = ops;
- else
- prog->aux->ops = &bpf_offload_prog_ops;
- prog->type = type;
- return 0;
- }
- enum bpf_audit {
- BPF_AUDIT_LOAD,
- BPF_AUDIT_UNLOAD,
- BPF_AUDIT_MAX,
- };
- static const char * const bpf_audit_str[BPF_AUDIT_MAX] = {
- [BPF_AUDIT_LOAD] = "LOAD",
- [BPF_AUDIT_UNLOAD] = "UNLOAD",
- };
- static void bpf_audit_prog(const struct bpf_prog *prog, unsigned int op)
- {
- struct audit_context *ctx = NULL;
- struct audit_buffer *ab;
- if (WARN_ON_ONCE(op >= BPF_AUDIT_MAX))
- return;
- if (audit_enabled == AUDIT_OFF)
- return;
- if (op == BPF_AUDIT_LOAD)
- ctx = audit_context();
- ab = audit_log_start(ctx, GFP_ATOMIC, AUDIT_BPF);
- if (unlikely(!ab))
- return;
- audit_log_format(ab, "prog-id=%u op=%s",
- prog->aux->id, bpf_audit_str[op]);
- audit_log_end(ab);
- }
- int __bpf_prog_charge(struct user_struct *user, u32 pages)
- {
- unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
- unsigned long user_bufs;
- if (user) {
- user_bufs = atomic_long_add_return(pages, &user->locked_vm);
- if (user_bufs > memlock_limit) {
- atomic_long_sub(pages, &user->locked_vm);
- return -EPERM;
- }
- }
- return 0;
- }
- void __bpf_prog_uncharge(struct user_struct *user, u32 pages)
- {
- if (user)
- atomic_long_sub(pages, &user->locked_vm);
- }
- static int bpf_prog_charge_memlock(struct bpf_prog *prog)
- {
- struct user_struct *user = get_current_user();
- int ret;
- ret = __bpf_prog_charge(user, prog->pages);
- if (ret) {
- free_uid(user);
- return ret;
- }
- prog->aux->user = user;
- return 0;
- }
- static void bpf_prog_uncharge_memlock(struct bpf_prog *prog)
- {
- struct user_struct *user = prog->aux->user;
- __bpf_prog_uncharge(user, prog->pages);
- free_uid(user);
- }
- static int bpf_prog_alloc_id(struct bpf_prog *prog)
- {
- int id;
- idr_preload(GFP_KERNEL);
- spin_lock_bh(&prog_idr_lock);
- id = idr_alloc_cyclic(&prog_idr, prog, 1, INT_MAX, GFP_ATOMIC);
- if (id > 0)
- prog->aux->id = id;
- spin_unlock_bh(&prog_idr_lock);
- idr_preload_end();
- /* id is in [1, INT_MAX) */
- if (WARN_ON_ONCE(!id))
- return -ENOSPC;
- return id > 0 ? 0 : id;
- }
- void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock)
- {
- /* cBPF to eBPF migrations are currently not in the idr store.
- * Offloaded programs are removed from the store when their device
- * disappears - even if someone grabs an fd to them they are unusable,
- * simply waiting for refcnt to drop to be freed.
- */
- if (!prog->aux->id)
- return;
- if (do_idr_lock)
- spin_lock_bh(&prog_idr_lock);
- else
- __acquire(&prog_idr_lock);
- idr_remove(&prog_idr, prog->aux->id);
- prog->aux->id = 0;
- if (do_idr_lock)
- spin_unlock_bh(&prog_idr_lock);
- else
- __release(&prog_idr_lock);
- }
- static void __bpf_prog_put_rcu(struct rcu_head *rcu)
- {
- struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
- kvfree(aux->func_info);
- kfree(aux->func_info_aux);
- bpf_prog_uncharge_memlock(aux->prog);
- security_bpf_prog_free(aux);
- bpf_prog_free(aux->prog);
- }
- static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred)
- {
- bpf_prog_kallsyms_del_all(prog);
- btf_put(prog->aux->btf);
- bpf_prog_free_linfo(prog);
- if (deferred) {
- if (prog->aux->sleepable)
- call_rcu_tasks_trace(&prog->aux->rcu, __bpf_prog_put_rcu);
- else
- call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
- } else {
- __bpf_prog_put_rcu(&prog->aux->rcu);
- }
- }
- static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
- {
- if (atomic64_dec_and_test(&prog->aux->refcnt)) {
- perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
- bpf_audit_prog(prog, BPF_AUDIT_UNLOAD);
- /* bpf_prog_free_id() must be called first */
- bpf_prog_free_id(prog, do_idr_lock);
- __bpf_prog_put_noref(prog, true);
- }
- }
- void bpf_prog_put(struct bpf_prog *prog)
- {
- __bpf_prog_put(prog, true);
- }
- EXPORT_SYMBOL_GPL(bpf_prog_put);
- static int bpf_prog_release(struct inode *inode, struct file *filp)
- {
- struct bpf_prog *prog = filp->private_data;
- bpf_prog_put(prog);
- return 0;
- }
- static void bpf_prog_get_stats(const struct bpf_prog *prog,
- struct bpf_prog_stats *stats)
- {
- u64 nsecs = 0, cnt = 0;
- int cpu;
- for_each_possible_cpu(cpu) {
- const struct bpf_prog_stats *st;
- unsigned int start;
- u64 tnsecs, tcnt;
- st = per_cpu_ptr(prog->aux->stats, cpu);
- do {
- start = u64_stats_fetch_begin_irq(&st->syncp);
- tnsecs = st->nsecs;
- tcnt = st->cnt;
- } while (u64_stats_fetch_retry_irq(&st->syncp, start));
- nsecs += tnsecs;
- cnt += tcnt;
- }
- stats->nsecs = nsecs;
- stats->cnt = cnt;
- }
- #ifdef CONFIG_PROC_FS
- static void bpf_prog_show_fdinfo(struct seq_file *m, struct file *filp)
- {
- const struct bpf_prog *prog = filp->private_data;
- char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
- struct bpf_prog_stats stats;
- bpf_prog_get_stats(prog, &stats);
- bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
- seq_printf(m,
- "prog_type:\t%u\n"
- "prog_jited:\t%u\n"
- "prog_tag:\t%s\n"
- "memlock:\t%llu\n"
- "prog_id:\t%u\n"
- "run_time_ns:\t%llu\n"
- "run_cnt:\t%llu\n",
- prog->type,
- prog->jited,
- prog_tag,
- prog->pages * 1ULL << PAGE_SHIFT,
- prog->aux->id,
- stats.nsecs,
- stats.cnt);
- }
- #endif
- const struct file_operations bpf_prog_fops = {
- #ifdef CONFIG_PROC_FS
- .show_fdinfo = bpf_prog_show_fdinfo,
- #endif
- .release = bpf_prog_release,
- .read = bpf_dummy_read,
- .write = bpf_dummy_write,
- };
- int bpf_prog_new_fd(struct bpf_prog *prog)
- {
- int ret;
- ret = security_bpf_prog(prog);
- if (ret < 0)
- return ret;
- return anon_inode_getfd("bpf-prog", &bpf_prog_fops, prog,
- O_RDWR | O_CLOEXEC);
- }
- static struct bpf_prog *____bpf_prog_get(struct fd f)
- {
- if (!f.file)
- return ERR_PTR(-EBADF);
- if (f.file->f_op != &bpf_prog_fops) {
- fdput(f);
- return ERR_PTR(-EINVAL);
- }
- return f.file->private_data;
- }
- void bpf_prog_add(struct bpf_prog *prog, int i)
- {
- atomic64_add(i, &prog->aux->refcnt);
- }
- EXPORT_SYMBOL_GPL(bpf_prog_add);
- void bpf_prog_sub(struct bpf_prog *prog, int i)
- {
- /* Only to be used for undoing previous bpf_prog_add() in some
- * error path. We still know that another entity in our call
- * path holds a reference to the program, thus atomic_sub() can
- * be safely used in such cases!
- */
- WARN_ON(atomic64_sub_return(i, &prog->aux->refcnt) == 0);
- }
- EXPORT_SYMBOL_GPL(bpf_prog_sub);
- void bpf_prog_inc(struct bpf_prog *prog)
- {
- atomic64_inc(&prog->aux->refcnt);
- }
- EXPORT_SYMBOL_GPL(bpf_prog_inc);
- /* prog_idr_lock should have been held */
- struct bpf_prog *bpf_prog_inc_not_zero(struct bpf_prog *prog)
- {
- int refold;
- refold = atomic64_fetch_add_unless(&prog->aux->refcnt, 1, 0);
- if (!refold)
- return ERR_PTR(-ENOENT);
- return prog;
- }
- EXPORT_SYMBOL_GPL(bpf_prog_inc_not_zero);
- bool bpf_prog_get_ok(struct bpf_prog *prog,
- enum bpf_prog_type *attach_type, bool attach_drv)
- {
- /* not an attachment, just a refcount inc, always allow */
- if (!attach_type)
- return true;
- if (prog->type != *attach_type)
- return false;
- if (bpf_prog_is_dev_bound(prog->aux) && !attach_drv)
- return false;
- return true;
- }
- static struct bpf_prog *__bpf_prog_get(u32 ufd, enum bpf_prog_type *attach_type,
- bool attach_drv)
- {
- struct fd f = fdget(ufd);
- struct bpf_prog *prog;
- prog = ____bpf_prog_get(f);
- if (IS_ERR(prog))
- return prog;
- if (!bpf_prog_get_ok(prog, attach_type, attach_drv)) {
- prog = ERR_PTR(-EINVAL);
- goto out;
- }
- bpf_prog_inc(prog);
- out:
- fdput(f);
- return prog;
- }
- struct bpf_prog *bpf_prog_get(u32 ufd)
- {
- return __bpf_prog_get(ufd, NULL, false);
- }
- struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
- bool attach_drv)
- {
- return __bpf_prog_get(ufd, &type, attach_drv);
- }
- EXPORT_SYMBOL_GPL(bpf_prog_get_type_dev);
- /* Initially all BPF programs could be loaded w/o specifying
- * expected_attach_type. Later for some of them specifying expected_attach_type
- * at load time became required so that program could be validated properly.
- * Programs of types that are allowed to be loaded both w/ and w/o (for
- * backward compatibility) expected_attach_type, should have the default attach
- * type assigned to expected_attach_type for the latter case, so that it can be
- * validated later at attach time.
- *
- * bpf_prog_load_fixup_attach_type() sets expected_attach_type in @attr if
- * prog type requires it but has some attach types that have to be backward
- * compatible.
- */
- static void bpf_prog_load_fixup_attach_type(union bpf_attr *attr)
- {
- switch (attr->prog_type) {
- case BPF_PROG_TYPE_CGROUP_SOCK:
- /* Unfortunately BPF_ATTACH_TYPE_UNSPEC enumeration doesn't
- * exist so checking for non-zero is the way to go here.
- */
- if (!attr->expected_attach_type)
- attr->expected_attach_type =
- BPF_CGROUP_INET_SOCK_CREATE;
- break;
- }
- }
- static int
- bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
- enum bpf_attach_type expected_attach_type,
- u32 btf_id, u32 prog_fd)
- {
- if (btf_id) {
- if (btf_id > BTF_MAX_TYPE)
- return -EINVAL;
- switch (prog_type) {
- case BPF_PROG_TYPE_TRACING:
- case BPF_PROG_TYPE_LSM:
- case BPF_PROG_TYPE_STRUCT_OPS:
- case BPF_PROG_TYPE_EXT:
- break;
- default:
- return -EINVAL;
- }
- }
- if (prog_fd && prog_type != BPF_PROG_TYPE_TRACING &&
- prog_type != BPF_PROG_TYPE_EXT)
- return -EINVAL;
- switch (prog_type) {
- case BPF_PROG_TYPE_CGROUP_SOCK:
- switch (expected_attach_type) {
- case BPF_CGROUP_INET_SOCK_CREATE:
- case BPF_CGROUP_INET_SOCK_RELEASE:
- case BPF_CGROUP_INET4_POST_BIND:
- case BPF_CGROUP_INET6_POST_BIND:
- return 0;
- default:
- return -EINVAL;
- }
- case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
- switch (expected_attach_type) {
- case BPF_CGROUP_INET4_BIND:
- case BPF_CGROUP_INET6_BIND:
- case BPF_CGROUP_INET4_CONNECT:
- case BPF_CGROUP_INET6_CONNECT:
- case BPF_CGROUP_INET4_GETPEERNAME:
- case BPF_CGROUP_INET6_GETPEERNAME:
- case BPF_CGROUP_INET4_GETSOCKNAME:
- case BPF_CGROUP_INET6_GETSOCKNAME:
- case BPF_CGROUP_UDP4_SENDMSG:
- case BPF_CGROUP_UDP6_SENDMSG:
- case BPF_CGROUP_UDP4_RECVMSG:
- case BPF_CGROUP_UDP6_RECVMSG:
- return 0;
- default:
- return -EINVAL;
- }
- case BPF_PROG_TYPE_CGROUP_SKB:
- switch (expected_attach_type) {
- case BPF_CGROUP_INET_INGRESS:
- case BPF_CGROUP_INET_EGRESS:
- return 0;
- default:
- return -EINVAL;
- }
- case BPF_PROG_TYPE_CGROUP_SOCKOPT:
- switch (expected_attach_type) {
- case BPF_CGROUP_SETSOCKOPT:
- case BPF_CGROUP_GETSOCKOPT:
- return 0;
- default:
- return -EINVAL;
- }
- case BPF_PROG_TYPE_SK_LOOKUP:
- if (expected_attach_type == BPF_SK_LOOKUP)
- return 0;
- return -EINVAL;
- case BPF_PROG_TYPE_EXT:
- if (expected_attach_type)
- return -EINVAL;
- fallthrough;
- default:
- return 0;
- }
- }
- static bool is_net_admin_prog_type(enum bpf_prog_type prog_type)
- {
- switch (prog_type) {
- case BPF_PROG_TYPE_SCHED_CLS:
- case BPF_PROG_TYPE_SCHED_ACT:
- case BPF_PROG_TYPE_XDP:
- case BPF_PROG_TYPE_LWT_IN:
- case BPF_PROG_TYPE_LWT_OUT:
- case BPF_PROG_TYPE_LWT_XMIT:
- case BPF_PROG_TYPE_LWT_SEG6LOCAL:
- case BPF_PROG_TYPE_SK_SKB:
- case BPF_PROG_TYPE_SK_MSG:
- case BPF_PROG_TYPE_LIRC_MODE2:
- case BPF_PROG_TYPE_FLOW_DISSECTOR:
- case BPF_PROG_TYPE_CGROUP_DEVICE:
- case BPF_PROG_TYPE_CGROUP_SOCK:
- case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
- case BPF_PROG_TYPE_CGROUP_SOCKOPT:
- case BPF_PROG_TYPE_CGROUP_SYSCTL:
- case BPF_PROG_TYPE_SOCK_OPS:
- case BPF_PROG_TYPE_EXT: /* extends any prog */
- return true;
- case BPF_PROG_TYPE_CGROUP_SKB:
- /* always unpriv */
- case BPF_PROG_TYPE_SK_REUSEPORT:
- /* equivalent to SOCKET_FILTER. need CAP_BPF only */
- default:
- return false;
- }
- }
- static bool is_perfmon_prog_type(enum bpf_prog_type prog_type)
- {
- switch (prog_type) {
- case BPF_PROG_TYPE_KPROBE:
- case BPF_PROG_TYPE_TRACEPOINT:
- case BPF_PROG_TYPE_PERF_EVENT:
- case BPF_PROG_TYPE_RAW_TRACEPOINT:
- case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
- case BPF_PROG_TYPE_TRACING:
- case BPF_PROG_TYPE_LSM:
- case BPF_PROG_TYPE_STRUCT_OPS: /* has access to struct sock */
- case BPF_PROG_TYPE_EXT: /* extends any prog */
- return true;
- default:
- return false;
- }
- }
- /* last field in 'union bpf_attr' used by this command */
- #define BPF_PROG_LOAD_LAST_FIELD attach_prog_fd
- static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
- {
- enum bpf_prog_type type = attr->prog_type;
- struct bpf_prog *prog;
- int err;
- char license[128];
- bool is_gpl;
- if (CHECK_ATTR(BPF_PROG_LOAD))
- return -EINVAL;
- if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
- BPF_F_ANY_ALIGNMENT |
- BPF_F_TEST_STATE_FREQ |
- BPF_F_SLEEPABLE |
- BPF_F_TEST_RND_HI32))
- return -EINVAL;
- if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
- (attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
- !bpf_capable())
- return -EPERM;
- /* copy eBPF program license from user space */
- if (strncpy_from_user(license, u64_to_user_ptr(attr->license),
- sizeof(license) - 1) < 0)
- return -EFAULT;
- license[sizeof(license) - 1] = 0;
- /* eBPF programs must be GPL compatible to use GPL-ed functions */
- is_gpl = license_is_gpl_compatible(license);
- if (attr->insn_cnt == 0 ||
- attr->insn_cnt > (bpf_capable() ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
- return -E2BIG;
- if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
- type != BPF_PROG_TYPE_CGROUP_SKB &&
- !bpf_capable())
- return -EPERM;
- if (is_net_admin_prog_type(type) && !capable(CAP_NET_ADMIN) && !capable(CAP_SYS_ADMIN))
- return -EPERM;
- if (is_perfmon_prog_type(type) && !perfmon_capable())
- return -EPERM;
- bpf_prog_load_fixup_attach_type(attr);
- if (bpf_prog_load_check_attach(type, attr->expected_attach_type,
- attr->attach_btf_id,
- attr->attach_prog_fd))
- return -EINVAL;
- /* plain bpf_prog allocation */
- prog = bpf_prog_alloc(bpf_prog_size(attr->insn_cnt), GFP_USER);
- if (!prog)
- return -ENOMEM;
- prog->expected_attach_type = attr->expected_attach_type;
- prog->aux->attach_btf_id = attr->attach_btf_id;
- if (attr->attach_prog_fd) {
- struct bpf_prog *dst_prog;
- dst_prog = bpf_prog_get(attr->attach_prog_fd);
- if (IS_ERR(dst_prog)) {
- err = PTR_ERR(dst_prog);
- goto free_prog_nouncharge;
- }
- prog->aux->dst_prog = dst_prog;
- }
- prog->aux->offload_requested = !!attr->prog_ifindex;
- prog->aux->sleepable = attr->prog_flags & BPF_F_SLEEPABLE;
- err = security_bpf_prog_alloc(prog->aux);
- if (err)
- goto free_prog_nouncharge;
- err = bpf_prog_charge_memlock(prog);
- if (err)
- goto free_prog_sec;
- prog->len = attr->insn_cnt;
- err = -EFAULT;
- if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns),
- bpf_prog_insn_size(prog)) != 0)
- goto free_prog;
- prog->orig_prog = NULL;
- prog->jited = 0;
- atomic64_set(&prog->aux->refcnt, 1);
- prog->gpl_compatible = is_gpl ? 1 : 0;
- if (bpf_prog_is_dev_bound(prog->aux)) {
- err = bpf_prog_offload_init(prog, attr);
- if (err)
- goto free_prog;
- }
- /* find program type: socket_filter vs tracing_filter */
- err = find_prog_type(type, prog);
- if (err < 0)
- goto free_prog;
- prog->aux->load_time = ktime_get_boottime_ns();
- err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name,
- sizeof(attr->prog_name));
- if (err < 0)
- goto free_prog;
- /* run eBPF verifier */
- err = bpf_check(&prog, attr, uattr);
- if (err < 0)
- goto free_used_maps;
- prog = bpf_prog_select_runtime(prog, &err);
- if (err < 0)
- goto free_used_maps;
- err = bpf_prog_alloc_id(prog);
- if (err)
- goto free_used_maps;
- /* Upon success of bpf_prog_alloc_id(), the BPF prog is
- * effectively publicly exposed. However, retrieving via
- * bpf_prog_get_fd_by_id() will take another reference,
- * therefore it cannot be gone underneath us.
- *
- * Only for the time /after/ successful bpf_prog_new_fd()
- * and before returning to userspace, we might just hold
- * one reference and any parallel close on that fd could
- * rip everything out. Hence, below notifications must
- * happen before bpf_prog_new_fd().
- *
- * Also, any failure handling from this point onwards must
- * be using bpf_prog_put() given the program is exposed.
- */
- bpf_prog_kallsyms_add(prog);
- perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
- bpf_audit_prog(prog, BPF_AUDIT_LOAD);
- err = bpf_prog_new_fd(prog);
- if (err < 0)
- bpf_prog_put(prog);
- return err;
- free_used_maps:
- /* In case we have subprogs, we need to wait for a grace
- * period before we can tear down JIT memory since symbols
- * are already exposed under kallsyms.
- */
- __bpf_prog_put_noref(prog, prog->aux->func_cnt);
- return err;
- free_prog:
- bpf_prog_uncharge_memlock(prog);
- free_prog_sec:
- security_bpf_prog_free(prog->aux);
- free_prog_nouncharge:
- bpf_prog_free(prog);
- return err;
- }
- #define BPF_OBJ_LAST_FIELD file_flags
- static int bpf_obj_pin(const union bpf_attr *attr)
- {
- if (CHECK_ATTR(BPF_OBJ) || attr->file_flags != 0)
- return -EINVAL;
- return bpf_obj_pin_user(attr->bpf_fd, u64_to_user_ptr(attr->pathname));
- }
- static int bpf_obj_get(const union bpf_attr *attr)
- {
- if (CHECK_ATTR(BPF_OBJ) || attr->bpf_fd != 0 ||
- attr->file_flags & ~BPF_OBJ_FLAG_MASK)
- return -EINVAL;
- return bpf_obj_get_user(u64_to_user_ptr(attr->pathname),
- attr->file_flags);
- }
- void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
- const struct bpf_link_ops *ops, struct bpf_prog *prog)
- {
- atomic64_set(&link->refcnt, 1);
- link->type = type;
- link->id = 0;
- link->ops = ops;
- link->prog = prog;
- }
- static void bpf_link_free_id(int id)
- {
- if (!id)
- return;
- spin_lock_bh(&link_idr_lock);
- idr_remove(&link_idr, id);
- spin_unlock_bh(&link_idr_lock);
- }
- /* Clean up bpf_link and corresponding anon_inode file and FD. After
- * anon_inode is created, bpf_link can't be just kfree()'d due to deferred
- * anon_inode's release() call. This helper marksbpf_link as
- * defunct, releases anon_inode file and puts reserved FD. bpf_prog's refcnt
- * is not decremented, it's the responsibility of a calling code that failed
- * to complete bpf_link initialization.
- */
- void bpf_link_cleanup(struct bpf_link_primer *primer)
- {
- primer->link->prog = NULL;
- bpf_link_free_id(primer->id);
- fput(primer->file);
- put_unused_fd(primer->fd);
- }
- void bpf_link_inc(struct bpf_link *link)
- {
- atomic64_inc(&link->refcnt);
- }
- /* bpf_link_free is guaranteed to be called from process context */
- static void bpf_link_free(struct bpf_link *link)
- {
- bpf_link_free_id(link->id);
- if (link->prog) {
- /* detach BPF program, clean up used resources */
- link->ops->release(link);
- bpf_prog_put(link->prog);
- }
- /* free bpf_link and its containing memory */
- link->ops->dealloc(link);
- }
- static void bpf_link_put_deferred(struct work_struct *work)
- {
- struct bpf_link *link = container_of(work, struct bpf_link, work);
- bpf_link_free(link);
- }
- /* bpf_link_put can be called from atomic context, but ensures that resources
- * are freed from process context
- */
- void bpf_link_put(struct bpf_link *link)
- {
- if (!atomic64_dec_and_test(&link->refcnt))
- return;
- if (in_atomic()) {
- INIT_WORK(&link->work, bpf_link_put_deferred);
- schedule_work(&link->work);
- } else {
- bpf_link_free(link);
- }
- }
- static int bpf_link_release(struct inode *inode, struct file *filp)
- {
- struct bpf_link *link = filp->private_data;
- bpf_link_put(link);
- return 0;
- }
- #ifdef CONFIG_PROC_FS
- #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type)
- #define BPF_MAP_TYPE(_id, _ops)
- #define BPF_LINK_TYPE(_id, _name) [_id] = #_name,
- static const char *bpf_link_type_strs[] = {
- [BPF_LINK_TYPE_UNSPEC] = "<invalid>",
- #include <linux/bpf_types.h>
- };
- #undef BPF_PROG_TYPE
- #undef BPF_MAP_TYPE
- #undef BPF_LINK_TYPE
- static void bpf_link_show_fdinfo(struct seq_file *m, struct file *filp)
- {
- const struct bpf_link *link = filp->private_data;
- const struct bpf_prog *prog = link->prog;
- char prog_tag[sizeof(prog->tag) * 2 + 1] = { };
- bin2hex(prog_tag, prog->tag, sizeof(prog->tag));
- seq_printf(m,
- "link_type:\t%s\n"
- "link_id:\t%u\n"
- "prog_tag:\t%s\n"
- "prog_id:\t%u\n",
- bpf_link_type_strs[link->type],
- link->id,
- prog_tag,
- prog->aux->id);
- if (link->ops->show_fdinfo)
- link->ops->show_fdinfo(link, m);
- }
- #endif
- static const struct file_operations bpf_link_fops = {
- #ifdef CONFIG_PROC_FS
- .show_fdinfo = bpf_link_show_fdinfo,
- #endif
- .release = bpf_link_release,
- .read = bpf_dummy_read,
- .write = bpf_dummy_write,
- };
- static int bpf_link_alloc_id(struct bpf_link *link)
- {
- int id;
- idr_preload(GFP_KERNEL);
- spin_lock_bh(&link_idr_lock);
- id = idr_alloc_cyclic(&link_idr, link, 1, INT_MAX, GFP_ATOMIC);
- spin_unlock_bh(&link_idr_lock);
- idr_preload_end();
- return id;
- }
- /* Prepare bpf_link to be exposed to user-space by allocating anon_inode file,
- * reserving unused FD and allocating ID from link_idr. This is to be paired
- * with bpf_link_settle() to install FD and ID and expose bpf_link to
- * user-space, if bpf_link is successfully attached. If not, bpf_link and
- * pre-allocated resources are to be freed with bpf_cleanup() call. All the
- * transient state is passed around in struct bpf_link_primer.
- * This is preferred way to create and initialize bpf_link, especially when
- * there are complicated and expensive operations inbetween creating bpf_link
- * itself and attaching it to BPF hook. By using bpf_link_prime() and
- * bpf_link_settle() kernel code using bpf_link doesn't have to perform
- * expensive (and potentially failing) roll back operations in a rare case
- * that file, FD, or ID can't be allocated.
- */
- int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer)
- {
- struct file *file;
- int fd, id;
- fd = get_unused_fd_flags(O_CLOEXEC);
- if (fd < 0)
- return fd;
- id = bpf_link_alloc_id(link);
- if (id < 0) {
- put_unused_fd(fd);
- return id;
- }
- file = anon_inode_getfile("bpf_link", &bpf_link_fops, link, O_CLOEXEC);
- if (IS_ERR(file)) {
- bpf_link_free_id(id);
- put_unused_fd(fd);
- return PTR_ERR(file);
- }
- primer->link = link;
- primer->file = file;
- primer->fd = fd;
- primer->id = id;
- return 0;
- }
- int bpf_link_settle(struct bpf_link_primer *primer)
- {
- /* make bpf_link fetchable by ID */
- spin_lock_bh(&link_idr_lock);
- primer->link->id = primer->id;
- spin_unlock_bh(&link_idr_lock);
- /* make bpf_link fetchable by FD */
- fd_install(primer->fd, primer->file);
- /* pass through installed FD */
- return primer->fd;
- }
- int bpf_link_new_fd(struct bpf_link *link)
- {
- return anon_inode_getfd("bpf-link", &bpf_link_fops, link, O_CLOEXEC);
- }
- struct bpf_link *bpf_link_get_from_fd(u32 ufd)
- {
- struct fd f = fdget(ufd);
- struct bpf_link *link;
- if (!f.file)
- return ERR_PTR(-EBADF);
- if (f.file->f_op != &bpf_link_fops) {
- fdput(f);
- return ERR_PTR(-EINVAL);
- }
- link = f.file->private_data;
- bpf_link_inc(link);
- fdput(f);
- return link;
- }
- struct bpf_tracing_link {
- struct bpf_link link;
- enum bpf_attach_type attach_type;
- struct bpf_trampoline *trampoline;
- struct bpf_prog *tgt_prog;
- };
- static void bpf_tracing_link_release(struct bpf_link *link)
- {
- struct bpf_tracing_link *tr_link =
- container_of(link, struct bpf_tracing_link, link);
- WARN_ON_ONCE(bpf_trampoline_unlink_prog(link->prog,
- tr_link->trampoline));
- bpf_trampoline_put(tr_link->trampoline);
- /* tgt_prog is NULL if target is a kernel function */
- if (tr_link->tgt_prog)
- bpf_prog_put(tr_link->tgt_prog);
- }
- static void bpf_tracing_link_dealloc(struct bpf_link *link)
- {
- struct bpf_tracing_link *tr_link =
- container_of(link, struct bpf_tracing_link, link);
- kfree(tr_link);
- }
- static void bpf_tracing_link_show_fdinfo(const struct bpf_link *link,
- struct seq_file *seq)
- {
- struct bpf_tracing_link *tr_link =
- container_of(link, struct bpf_tracing_link, link);
- seq_printf(seq,
- "attach_type:\t%d\n",
- tr_link->attach_type);
- }
- static int bpf_tracing_link_fill_link_info(const struct bpf_link *link,
- struct bpf_link_info *info)
- {
- struct bpf_tracing_link *tr_link =
- container_of(link, struct bpf_tracing_link, link);
- info->tracing.attach_type = tr_link->attach_type;
- return 0;
- }
- static const struct bpf_link_ops bpf_tracing_link_lops = {
- .release = bpf_tracing_link_release,
- .dealloc = bpf_tracing_link_dealloc,
- .show_fdinfo = bpf_tracing_link_show_fdinfo,
- .fill_link_info = bpf_tracing_link_fill_link_info,
- };
- static int bpf_tracing_prog_attach(struct bpf_prog *prog,
- int tgt_prog_fd,
- u32 btf_id)
- {
- struct bpf_link_primer link_primer;
- struct bpf_prog *tgt_prog = NULL;
- struct bpf_trampoline *tr = NULL;
- struct bpf_tracing_link *link;
- u64 key = 0;
- int err;
- switch (prog->type) {
- case BPF_PROG_TYPE_TRACING:
- if (prog->expected_attach_type != BPF_TRACE_FENTRY &&
- prog->expected_attach_type != BPF_TRACE_FEXIT &&
- prog->expected_attach_type != BPF_MODIFY_RETURN) {
- err = -EINVAL;
- goto out_put_prog;
- }
- break;
- case BPF_PROG_TYPE_EXT:
- if (prog->expected_attach_type != 0) {
- err = -EINVAL;
- goto out_put_prog;
- }
- break;
- case BPF_PROG_TYPE_LSM:
- if (prog->expected_attach_type != BPF_LSM_MAC) {
- err = -EINVAL;
- goto out_put_prog;
- }
- break;
- default:
- err = -EINVAL;
- goto out_put_prog;
- }
- if (!!tgt_prog_fd != !!btf_id) {
- err = -EINVAL;
- goto out_put_prog;
- }
- if (tgt_prog_fd) {
- /* For now we only allow new targets for BPF_PROG_TYPE_EXT */
- if (prog->type != BPF_PROG_TYPE_EXT) {
- err = -EINVAL;
- goto out_put_prog;
- }
- tgt_prog = bpf_prog_get(tgt_prog_fd);
- if (IS_ERR(tgt_prog)) {
- err = PTR_ERR(tgt_prog);
- tgt_prog = NULL;
- goto out_put_prog;
- }
- key = bpf_trampoline_compute_key(tgt_prog, btf_id);
- }
- link = kzalloc(sizeof(*link), GFP_USER);
- if (!link) {
- err = -ENOMEM;
- goto out_put_prog;
- }
- bpf_link_init(&link->link, BPF_LINK_TYPE_TRACING,
- &bpf_tracing_link_lops, prog);
- link->attach_type = prog->expected_attach_type;
- mutex_lock(&prog->aux->dst_mutex);
- /* There are a few possible cases here:
- *
- * - if prog->aux->dst_trampoline is set, the program was just loaded
- * and not yet attached to anything, so we can use the values stored
- * in prog->aux
- *
- * - if prog->aux->dst_trampoline is NULL, the program has already been
- * attached to a target and its initial target was cleared (below)
- *
- * - if tgt_prog != NULL, the caller specified tgt_prog_fd +
- * target_btf_id using the link_create API.
- *
- * - if tgt_prog == NULL when this function was called using the old
- * raw_tracepoint_open API, and we need a target from prog->aux
- *
- * The combination of no saved target in prog->aux, and no target
- * specified on load is illegal, and we reject that here.
- */
- if (!prog->aux->dst_trampoline && !tgt_prog) {
- err = -ENOENT;
- goto out_unlock;
- }
- if (!prog->aux->dst_trampoline ||
- (key && key != prog->aux->dst_trampoline->key)) {
- /* If there is no saved target, or the specified target is
- * different from the destination specified at load time, we
- * need a new trampoline and a check for compatibility
- */
- struct bpf_attach_target_info tgt_info = {};
- err = bpf_check_attach_target(NULL, prog, tgt_prog, btf_id,
- &tgt_info);
- if (err)
- goto out_unlock;
- tr = bpf_trampoline_get(key, &tgt_info);
- if (!tr) {
- err = -ENOMEM;
- goto out_unlock;
- }
- } else {
- /* The caller didn't specify a target, or the target was the
- * same as the destination supplied during program load. This
- * means we can reuse the trampoline and reference from program
- * load time, and there is no need to allocate a new one. This
- * can only happen once for any program, as the saved values in
- * prog->aux are cleared below.
- */
- tr = prog->aux->dst_trampoline;
- tgt_prog = prog->aux->dst_prog;
- }
- err = bpf_link_prime(&link->link, &link_primer);
- if (err)
- goto out_unlock;
- err = bpf_trampoline_link_prog(prog, tr);
- if (err) {
- bpf_link_cleanup(&link_primer);
- link = NULL;
- goto out_unlock;
- }
- link->tgt_prog = tgt_prog;
- link->trampoline = tr;
- /* Always clear the trampoline and target prog from prog->aux to make
- * sure the original attach destination is not kept alive after a
- * program is (re-)attached to another target.
- */
- if (prog->aux->dst_prog &&
- (tgt_prog_fd || tr != prog->aux->dst_trampoline))
- /* got extra prog ref from syscall, or attaching to different prog */
- bpf_prog_put(prog->aux->dst_prog);
- if (prog->aux->dst_trampoline && tr != prog->aux->dst_trampoline)
- /* we allocated a new trampoline, so free the old one */
- bpf_trampoline_put(prog->aux->dst_trampoline);
- prog->aux->dst_prog = NULL;
- prog->aux->dst_trampoline = NULL;
- mutex_unlock(&prog->aux->dst_mutex);
- return bpf_link_settle(&link_primer);
- out_unlock:
- if (tr && tr != prog->aux->dst_trampoline)
- bpf_trampoline_put(tr);
- mutex_unlock(&prog->aux->dst_mutex);
- kfree(link);
- out_put_prog:
- if (tgt_prog_fd && tgt_prog)
- bpf_prog_put(tgt_prog);
- return err;
- }
- struct bpf_raw_tp_link {
- struct bpf_link link;
- struct bpf_raw_event_map *btp;
- };
- static void bpf_raw_tp_link_release(struct bpf_link *link)
- {
- struct bpf_raw_tp_link *raw_tp =
- container_of(link, struct bpf_raw_tp_link, link);
- bpf_probe_unregister(raw_tp->btp, raw_tp->link.prog);
- bpf_put_raw_tracepoint(raw_tp->btp);
- }
- static void bpf_raw_tp_link_dealloc(struct bpf_link *link)
- {
- struct bpf_raw_tp_link *raw_tp =
- container_of(link, struct bpf_raw_tp_link, link);
- kfree(raw_tp);
- }
- static void bpf_raw_tp_link_show_fdinfo(const struct bpf_link *link,
- struct seq_file *seq)
- {
- struct bpf_raw_tp_link *raw_tp_link =
- container_of(link, struct bpf_raw_tp_link, link);
- seq_printf(seq,
- "tp_name:\t%s\n",
- raw_tp_link->btp->tp->name);
- }
- static int bpf_raw_tp_link_fill_link_info(const struct bpf_link *link,
- struct bpf_link_info *info)
- {
- struct bpf_raw_tp_link *raw_tp_link =
- container_of(link, struct bpf_raw_tp_link, link);
- char __user *ubuf = u64_to_user_ptr(info->raw_tracepoint.tp_name);
- const char *tp_name = raw_tp_link->btp->tp->name;
- u32 ulen = info->raw_tracepoint.tp_name_len;
- size_t tp_len = strlen(tp_name);
- if (!ulen ^ !ubuf)
- return -EINVAL;
- info->raw_tracepoint.tp_name_len = tp_len + 1;
- if (!ubuf)
- return 0;
- if (ulen >= tp_len + 1) {
- if (copy_to_user(ubuf, tp_name, tp_len + 1))
- return -EFAULT;
- } else {
- char zero = '\0';
- if (copy_to_user(ubuf, tp_name, ulen - 1))
- return -EFAULT;
- if (put_user(zero, ubuf + ulen - 1))
- return -EFAULT;
- return -ENOSPC;
- }
- return 0;
- }
- static const struct bpf_link_ops bpf_raw_tp_link_lops = {
- .release = bpf_raw_tp_link_release,
- .dealloc = bpf_raw_tp_link_dealloc,
- .show_fdinfo = bpf_raw_tp_link_show_fdinfo,
- .fill_link_info = bpf_raw_tp_link_fill_link_info,
- };
- #define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd
- static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
- {
- struct bpf_link_primer link_primer;
- struct bpf_raw_tp_link *link;
- struct bpf_raw_event_map *btp;
- struct bpf_prog *prog;
- const char *tp_name;
- char buf[128];
- int err;
- if (CHECK_ATTR(BPF_RAW_TRACEPOINT_OPEN))
- return -EINVAL;
- prog = bpf_prog_get(attr->raw_tracepoint.prog_fd);
- if (IS_ERR(prog))
- return PTR_ERR(prog);
- switch (prog->type) {
- case BPF_PROG_TYPE_TRACING:
- case BPF_PROG_TYPE_EXT:
- case BPF_PROG_TYPE_LSM:
- if (attr->raw_tracepoint.name) {
- /* The attach point for this category of programs
- * should be specified via btf_id during program load.
- */
- err = -EINVAL;
- goto out_put_prog;
- }
- if (prog->type == BPF_PROG_TYPE_TRACING &&
- prog->expected_attach_type == BPF_TRACE_RAW_TP) {
- tp_name = prog->aux->attach_func_name;
- break;
- }
- err = bpf_tracing_prog_attach(prog, 0, 0);
- if (err >= 0)
- return err;
- goto out_put_prog;
- case BPF_PROG_TYPE_RAW_TRACEPOINT:
- case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
- if (strncpy_from_user(buf,
- u64_to_user_ptr(attr->raw_tracepoint.name),
- sizeof(buf) - 1) < 0) {
- err = -EFAULT;
- goto out_put_prog;
- }
- buf[sizeof(buf) - 1] = 0;
- tp_name = buf;
- break;
- default:
- err = -EINVAL;
- goto out_put_prog;
- }
- btp = bpf_get_raw_tracepoint(tp_name);
- if (!btp) {
- err = -ENOENT;
- goto out_put_prog;
- }
- link = kzalloc(sizeof(*link), GFP_USER);
- if (!link) {
- err = -ENOMEM;
- goto out_put_btp;
- }
- bpf_link_init(&link->link, BPF_LINK_TYPE_RAW_TRACEPOINT,
- &bpf_raw_tp_link_lops, prog);
- link->btp = btp;
- err = bpf_link_prime(&link->link, &link_primer);
- if (err) {
- kfree(link);
- goto out_put_btp;
- }
- err = bpf_probe_register(link->btp, prog);
- if (err) {
- bpf_link_cleanup(&link_primer);
- goto out_put_btp;
- }
- return bpf_link_settle(&link_primer);
- out_put_btp:
- bpf_put_raw_tracepoint(btp);
- out_put_prog:
- bpf_prog_put(prog);
- return err;
- }
- static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
- enum bpf_attach_type attach_type)
- {
- switch (prog->type) {
- case BPF_PROG_TYPE_CGROUP_SOCK:
- case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
- case BPF_PROG_TYPE_CGROUP_SOCKOPT:
- case BPF_PROG_TYPE_SK_LOOKUP:
- return attach_type == prog->expected_attach_type ? 0 : -EINVAL;
- case BPF_PROG_TYPE_CGROUP_SKB:
- if (!capable(CAP_NET_ADMIN))
- /* cg-skb progs can be loaded by unpriv user.
- * check permissions at attach time.
- */
- return -EPERM;
- return prog->enforce_expected_attach_type &&
- prog->expected_attach_type != attach_type ?
- -EINVAL : 0;
- default:
- return 0;
- }
- }
- static enum bpf_prog_type
- attach_type_to_prog_type(enum bpf_attach_type attach_type)
- {
- switch (attach_type) {
- case BPF_CGROUP_INET_INGRESS:
- case BPF_CGROUP_INET_EGRESS:
- return BPF_PROG_TYPE_CGROUP_SKB;
- case BPF_CGROUP_INET_SOCK_CREATE:
- case BPF_CGROUP_INET_SOCK_RELEASE:
- case BPF_CGROUP_INET4_POST_BIND:
- case BPF_CGROUP_INET6_POST_BIND:
- return BPF_PROG_TYPE_CGROUP_SOCK;
- case BPF_CGROUP_INET4_BIND:
- case BPF_CGROUP_INET6_BIND:
- case BPF_CGROUP_INET4_CONNECT:
- case BPF_CGROUP_INET6_CONNECT:
- case BPF_CGROUP_INET4_GETPEERNAME:
- case BPF_CGROUP_INET6_GETPEERNAME:
- case BPF_CGROUP_INET4_GETSOCKNAME:
- case BPF_CGROUP_INET6_GETSOCKNAME:
- case BPF_CGROUP_UDP4_SENDMSG:
- case BPF_CGROUP_UDP6_SENDMSG:
- case BPF_CGROUP_UDP4_RECVMSG:
- case BPF_CGROUP_UDP6_RECVMSG:
- return BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
- case BPF_CGROUP_SOCK_OPS:
- return BPF_PROG_TYPE_SOCK_OPS;
- case BPF_CGROUP_DEVICE:
- return BPF_PROG_TYPE_CGROUP_DEVICE;
- case BPF_SK_MSG_VERDICT:
- return BPF_PROG_TYPE_SK_MSG;
- case BPF_SK_SKB_STREAM_PARSER:
- case BPF_SK_SKB_STREAM_VERDICT:
- return BPF_PROG_TYPE_SK_SKB;
- case BPF_LIRC_MODE2:
- return BPF_PROG_TYPE_LIRC_MODE2;
- case BPF_FLOW_DISSECTOR:
- return BPF_PROG_TYPE_FLOW_DISSECTOR;
- case BPF_CGROUP_SYSCTL:
- return BPF_PROG_TYPE_CGROUP_SYSCTL;
- case BPF_CGROUP_GETSOCKOPT:
- case BPF_CGROUP_SETSOCKOPT:
- return BPF_PROG_TYPE_CGROUP_SOCKOPT;
- case BPF_TRACE_ITER:
- return BPF_PROG_TYPE_TRACING;
- case BPF_SK_LOOKUP:
- return BPF_PROG_TYPE_SK_LOOKUP;
- case BPF_XDP:
- return BPF_PROG_TYPE_XDP;
- default:
- return BPF_PROG_TYPE_UNSPEC;
- }
- }
- #define BPF_PROG_ATTACH_LAST_FIELD replace_bpf_fd
- #define BPF_F_ATTACH_MASK \
- (BPF_F_ALLOW_OVERRIDE | BPF_F_ALLOW_MULTI | BPF_F_REPLACE)
- static int bpf_prog_attach(const union bpf_attr *attr)
- {
- enum bpf_prog_type ptype;
- struct bpf_prog *prog;
- int ret;
- if (CHECK_ATTR(BPF_PROG_ATTACH))
- return -EINVAL;
- if (attr->attach_flags & ~BPF_F_ATTACH_MASK)
- return -EINVAL;
- ptype = attach_type_to_prog_type(attr->attach_type);
- if (ptype == BPF_PROG_TYPE_UNSPEC)
- return -EINVAL;
- prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
- if (IS_ERR(prog))
- return PTR_ERR(prog);
- if (bpf_prog_attach_check_attach_type(prog, attr->attach_type)) {
- bpf_prog_put(prog);
- return -EINVAL;
- }
- switch (ptype) {
- case BPF_PROG_TYPE_SK_SKB:
- case BPF_PROG_TYPE_SK_MSG:
- ret = sock_map_get_from_fd(attr, prog);
- break;
- case BPF_PROG_TYPE_LIRC_MODE2:
- ret = lirc_prog_attach(attr, prog);
- break;
- case BPF_PROG_TYPE_FLOW_DISSECTOR:
- ret = netns_bpf_prog_attach(attr, prog);
- break;
- case BPF_PROG_TYPE_CGROUP_DEVICE:
- case BPF_PROG_TYPE_CGROUP_SKB:
- case BPF_PROG_TYPE_CGROUP_SOCK:
- case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
- case BPF_PROG_TYPE_CGROUP_SOCKOPT:
- case BPF_PROG_TYPE_CGROUP_SYSCTL:
- case BPF_PROG_TYPE_SOCK_OPS:
- ret = cgroup_bpf_prog_attach(attr, ptype, prog);
- break;
- default:
- ret = -EINVAL;
- }
- if (ret)
- bpf_prog_put(prog);
- return ret;
- }
- #define BPF_PROG_DETACH_LAST_FIELD attach_type
- static int bpf_prog_detach(const union bpf_attr *attr)
- {
- enum bpf_prog_type ptype;
- if (CHECK_ATTR(BPF_PROG_DETACH))
- return -EINVAL;
- ptype = attach_type_to_prog_type(attr->attach_type);
- switch (ptype) {
- case BPF_PROG_TYPE_SK_MSG:
- case BPF_PROG_TYPE_SK_SKB:
- return sock_map_prog_detach(attr, ptype);
- case BPF_PROG_TYPE_LIRC_MODE2:
- return lirc_prog_detach(attr);
- case BPF_PROG_TYPE_FLOW_DISSECTOR:
- return netns_bpf_prog_detach(attr, ptype);
- case BPF_PROG_TYPE_CGROUP_DEVICE:
- case BPF_PROG_TYPE_CGROUP_SKB:
- case BPF_PROG_TYPE_CGROUP_SOCK:
- case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
- case BPF_PROG_TYPE_CGROUP_SOCKOPT:
- case BPF_PROG_TYPE_CGROUP_SYSCTL:
- case BPF_PROG_TYPE_SOCK_OPS:
- return cgroup_bpf_prog_detach(attr, ptype);
- default:
- return -EINVAL;
- }
- }
- #define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt
- static int bpf_prog_query(const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- if (CHECK_ATTR(BPF_PROG_QUERY))
- return -EINVAL;
- if (attr->query.query_flags & ~BPF_F_QUERY_EFFECTIVE)
- return -EINVAL;
- switch (attr->query.attach_type) {
- case BPF_CGROUP_INET_INGRESS:
- case BPF_CGROUP_INET_EGRESS:
- case BPF_CGROUP_INET_SOCK_CREATE:
- case BPF_CGROUP_INET_SOCK_RELEASE:
- case BPF_CGROUP_INET4_BIND:
- case BPF_CGROUP_INET6_BIND:
- case BPF_CGROUP_INET4_POST_BIND:
- case BPF_CGROUP_INET6_POST_BIND:
- case BPF_CGROUP_INET4_CONNECT:
- case BPF_CGROUP_INET6_CONNECT:
- case BPF_CGROUP_INET4_GETPEERNAME:
- case BPF_CGROUP_INET6_GETPEERNAME:
- case BPF_CGROUP_INET4_GETSOCKNAME:
- case BPF_CGROUP_INET6_GETSOCKNAME:
- case BPF_CGROUP_UDP4_SENDMSG:
- case BPF_CGROUP_UDP6_SENDMSG:
- case BPF_CGROUP_UDP4_RECVMSG:
- case BPF_CGROUP_UDP6_RECVMSG:
- case BPF_CGROUP_SOCK_OPS:
- case BPF_CGROUP_DEVICE:
- case BPF_CGROUP_SYSCTL:
- case BPF_CGROUP_GETSOCKOPT:
- case BPF_CGROUP_SETSOCKOPT:
- return cgroup_bpf_prog_query(attr, uattr);
- case BPF_LIRC_MODE2:
- return lirc_prog_query(attr, uattr);
- case BPF_FLOW_DISSECTOR:
- case BPF_SK_LOOKUP:
- return netns_bpf_prog_query(attr, uattr);
- default:
- return -EINVAL;
- }
- }
- #define BPF_PROG_TEST_RUN_LAST_FIELD test.cpu
- static int bpf_prog_test_run(const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- struct bpf_prog *prog;
- int ret = -ENOTSUPP;
- if (CHECK_ATTR(BPF_PROG_TEST_RUN))
- return -EINVAL;
- if ((attr->test.ctx_size_in && !attr->test.ctx_in) ||
- (!attr->test.ctx_size_in && attr->test.ctx_in))
- return -EINVAL;
- if ((attr->test.ctx_size_out && !attr->test.ctx_out) ||
- (!attr->test.ctx_size_out && attr->test.ctx_out))
- return -EINVAL;
- prog = bpf_prog_get(attr->test.prog_fd);
- if (IS_ERR(prog))
- return PTR_ERR(prog);
- if (prog->aux->ops->test_run)
- ret = prog->aux->ops->test_run(prog, attr, uattr);
- bpf_prog_put(prog);
- return ret;
- }
- #define BPF_OBJ_GET_NEXT_ID_LAST_FIELD next_id
- static int bpf_obj_get_next_id(const union bpf_attr *attr,
- union bpf_attr __user *uattr,
- struct idr *idr,
- spinlock_t *lock)
- {
- u32 next_id = attr->start_id;
- int err = 0;
- if (CHECK_ATTR(BPF_OBJ_GET_NEXT_ID) || next_id >= INT_MAX)
- return -EINVAL;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- next_id++;
- spin_lock_bh(lock);
- if (!idr_get_next(idr, &next_id))
- err = -ENOENT;
- spin_unlock_bh(lock);
- if (!err)
- err = put_user(next_id, &uattr->next_id);
- return err;
- }
- struct bpf_map *bpf_map_get_curr_or_next(u32 *id)
- {
- struct bpf_map *map;
- spin_lock_bh(&map_idr_lock);
- again:
- map = idr_get_next(&map_idr, id);
- if (map) {
- map = __bpf_map_inc_not_zero(map, false);
- if (IS_ERR(map)) {
- (*id)++;
- goto again;
- }
- }
- spin_unlock_bh(&map_idr_lock);
- return map;
- }
- struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id)
- {
- struct bpf_prog *prog;
- spin_lock_bh(&prog_idr_lock);
- again:
- prog = idr_get_next(&prog_idr, id);
- if (prog) {
- prog = bpf_prog_inc_not_zero(prog);
- if (IS_ERR(prog)) {
- (*id)++;
- goto again;
- }
- }
- spin_unlock_bh(&prog_idr_lock);
- return prog;
- }
- #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
- struct bpf_prog *bpf_prog_by_id(u32 id)
- {
- struct bpf_prog *prog;
- if (!id)
- return ERR_PTR(-ENOENT);
- spin_lock_bh(&prog_idr_lock);
- prog = idr_find(&prog_idr, id);
- if (prog)
- prog = bpf_prog_inc_not_zero(prog);
- else
- prog = ERR_PTR(-ENOENT);
- spin_unlock_bh(&prog_idr_lock);
- return prog;
- }
- static int bpf_prog_get_fd_by_id(const union bpf_attr *attr)
- {
- struct bpf_prog *prog;
- u32 id = attr->prog_id;
- int fd;
- if (CHECK_ATTR(BPF_PROG_GET_FD_BY_ID))
- return -EINVAL;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- prog = bpf_prog_by_id(id);
- if (IS_ERR(prog))
- return PTR_ERR(prog);
- fd = bpf_prog_new_fd(prog);
- if (fd < 0)
- bpf_prog_put(prog);
- return fd;
- }
- #define BPF_MAP_GET_FD_BY_ID_LAST_FIELD open_flags
- static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
- {
- struct bpf_map *map;
- u32 id = attr->map_id;
- int f_flags;
- int fd;
- if (CHECK_ATTR(BPF_MAP_GET_FD_BY_ID) ||
- attr->open_flags & ~BPF_OBJ_FLAG_MASK)
- return -EINVAL;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- f_flags = bpf_get_file_flag(attr->open_flags);
- if (f_flags < 0)
- return f_flags;
- spin_lock_bh(&map_idr_lock);
- map = idr_find(&map_idr, id);
- if (map)
- map = __bpf_map_inc_not_zero(map, true);
- else
- map = ERR_PTR(-ENOENT);
- spin_unlock_bh(&map_idr_lock);
- if (IS_ERR(map))
- return PTR_ERR(map);
- fd = bpf_map_new_fd(map, f_flags);
- if (fd < 0)
- bpf_map_put_with_uref(map);
- return fd;
- }
- static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
- unsigned long addr, u32 *off,
- u32 *type)
- {
- const struct bpf_map *map;
- int i;
- mutex_lock(&prog->aux->used_maps_mutex);
- for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {
- map = prog->aux->used_maps[i];
- if (map == (void *)addr) {
- *type = BPF_PSEUDO_MAP_FD;
- goto out;
- }
- if (!map->ops->map_direct_value_meta)
- continue;
- if (!map->ops->map_direct_value_meta(map, addr, off)) {
- *type = BPF_PSEUDO_MAP_VALUE;
- goto out;
- }
- }
- map = NULL;
- out:
- mutex_unlock(&prog->aux->used_maps_mutex);
- return map;
- }
- static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog,
- const struct cred *f_cred)
- {
- const struct bpf_map *map;
- struct bpf_insn *insns;
- u32 off, type;
- u64 imm;
- u8 code;
- int i;
- insns = kmemdup(prog->insnsi, bpf_prog_insn_size(prog),
- GFP_USER);
- if (!insns)
- return insns;
- for (i = 0; i < prog->len; i++) {
- code = insns[i].code;
- if (code == (BPF_JMP | BPF_TAIL_CALL)) {
- insns[i].code = BPF_JMP | BPF_CALL;
- insns[i].imm = BPF_FUNC_tail_call;
- /* fall-through */
- }
- if (code == (BPF_JMP | BPF_CALL) ||
- code == (BPF_JMP | BPF_CALL_ARGS)) {
- if (code == (BPF_JMP | BPF_CALL_ARGS))
- insns[i].code = BPF_JMP | BPF_CALL;
- if (!bpf_dump_raw_ok(f_cred))
- insns[i].imm = 0;
- continue;
- }
- if (BPF_CLASS(code) == BPF_LDX && BPF_MODE(code) == BPF_PROBE_MEM) {
- insns[i].code = BPF_LDX | BPF_SIZE(code) | BPF_MEM;
- continue;
- }
- if (code != (BPF_LD | BPF_IMM | BPF_DW))
- continue;
- imm = ((u64)insns[i + 1].imm << 32) | (u32)insns[i].imm;
- map = bpf_map_from_imm(prog, imm, &off, &type);
- if (map) {
- insns[i].src_reg = type;
- insns[i].imm = map->id;
- insns[i + 1].imm = off;
- continue;
- }
- }
- return insns;
- }
- static int set_info_rec_size(struct bpf_prog_info *info)
- {
- /*
- * Ensure info.*_rec_size is the same as kernel expected size
- *
- * or
- *
- * Only allow zero *_rec_size if both _rec_size and _cnt are
- * zero. In this case, the kernel will set the expected
- * _rec_size back to the info.
- */
- if ((info->nr_func_info || info->func_info_rec_size) &&
- info->func_info_rec_size != sizeof(struct bpf_func_info))
- return -EINVAL;
- if ((info->nr_line_info || info->line_info_rec_size) &&
- info->line_info_rec_size != sizeof(struct bpf_line_info))
- return -EINVAL;
- if ((info->nr_jited_line_info || info->jited_line_info_rec_size) &&
- info->jited_line_info_rec_size != sizeof(__u64))
- return -EINVAL;
- info->func_info_rec_size = sizeof(struct bpf_func_info);
- info->line_info_rec_size = sizeof(struct bpf_line_info);
- info->jited_line_info_rec_size = sizeof(__u64);
- return 0;
- }
- static int bpf_prog_get_info_by_fd(struct file *file,
- struct bpf_prog *prog,
- const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info);
- struct bpf_prog_info info;
- u32 info_len = attr->info.info_len;
- struct bpf_prog_stats stats;
- char __user *uinsns;
- u32 ulen;
- int err;
- err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
- if (err)
- return err;
- info_len = min_t(u32, sizeof(info), info_len);
- memset(&info, 0, sizeof(info));
- if (copy_from_user(&info, uinfo, info_len))
- return -EFAULT;
- info.type = prog->type;
- info.id = prog->aux->id;
- info.load_time = prog->aux->load_time;
- info.created_by_uid = from_kuid_munged(current_user_ns(),
- prog->aux->user->uid);
- info.gpl_compatible = prog->gpl_compatible;
- memcpy(info.tag, prog->tag, sizeof(prog->tag));
- memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
- mutex_lock(&prog->aux->used_maps_mutex);
- ulen = info.nr_map_ids;
- info.nr_map_ids = prog->aux->used_map_cnt;
- ulen = min_t(u32, info.nr_map_ids, ulen);
- if (ulen) {
- u32 __user *user_map_ids = u64_to_user_ptr(info.map_ids);
- u32 i;
- for (i = 0; i < ulen; i++)
- if (put_user(prog->aux->used_maps[i]->id,
- &user_map_ids[i])) {
- mutex_unlock(&prog->aux->used_maps_mutex);
- return -EFAULT;
- }
- }
- mutex_unlock(&prog->aux->used_maps_mutex);
- err = set_info_rec_size(&info);
- if (err)
- return err;
- bpf_prog_get_stats(prog, &stats);
- info.run_time_ns = stats.nsecs;
- info.run_cnt = stats.cnt;
- if (!bpf_capable()) {
- info.jited_prog_len = 0;
- info.xlated_prog_len = 0;
- info.nr_jited_ksyms = 0;
- info.nr_jited_func_lens = 0;
- info.nr_func_info = 0;
- info.nr_line_info = 0;
- info.nr_jited_line_info = 0;
- goto done;
- }
- ulen = info.xlated_prog_len;
- info.xlated_prog_len = bpf_prog_insn_size(prog);
- if (info.xlated_prog_len && ulen) {
- struct bpf_insn *insns_sanitized;
- bool fault;
- if (prog->blinded && !bpf_dump_raw_ok(file->f_cred)) {
- info.xlated_prog_insns = 0;
- goto done;
- }
- insns_sanitized = bpf_insn_prepare_dump(prog, file->f_cred);
- if (!insns_sanitized)
- return -ENOMEM;
- uinsns = u64_to_user_ptr(info.xlated_prog_insns);
- ulen = min_t(u32, info.xlated_prog_len, ulen);
- fault = copy_to_user(uinsns, insns_sanitized, ulen);
- kfree(insns_sanitized);
- if (fault)
- return -EFAULT;
- }
- if (bpf_prog_is_dev_bound(prog->aux)) {
- err = bpf_prog_offload_info_fill(&info, prog);
- if (err)
- return err;
- goto done;
- }
- /* NOTE: the following code is supposed to be skipped for offload.
- * bpf_prog_offload_info_fill() is the place to fill similar fields
- * for offload.
- */
- ulen = info.jited_prog_len;
- if (prog->aux->func_cnt) {
- u32 i;
- info.jited_prog_len = 0;
- for (i = 0; i < prog->aux->func_cnt; i++)
- info.jited_prog_len += prog->aux->func[i]->jited_len;
- } else {
- info.jited_prog_len = prog->jited_len;
- }
- if (info.jited_prog_len && ulen) {
- if (bpf_dump_raw_ok(file->f_cred)) {
- uinsns = u64_to_user_ptr(info.jited_prog_insns);
- ulen = min_t(u32, info.jited_prog_len, ulen);
- /* for multi-function programs, copy the JITed
- * instructions for all the functions
- */
- if (prog->aux->func_cnt) {
- u32 len, free, i;
- u8 *img;
- free = ulen;
- for (i = 0; i < prog->aux->func_cnt; i++) {
- len = prog->aux->func[i]->jited_len;
- len = min_t(u32, len, free);
- img = (u8 *) prog->aux->func[i]->bpf_func;
- if (copy_to_user(uinsns, img, len))
- return -EFAULT;
- uinsns += len;
- free -= len;
- if (!free)
- break;
- }
- } else {
- if (copy_to_user(uinsns, prog->bpf_func, ulen))
- return -EFAULT;
- }
- } else {
- info.jited_prog_insns = 0;
- }
- }
- ulen = info.nr_jited_ksyms;
- info.nr_jited_ksyms = prog->aux->func_cnt ? : 1;
- if (ulen) {
- if (bpf_dump_raw_ok(file->f_cred)) {
- unsigned long ksym_addr;
- u64 __user *user_ksyms;
- u32 i;
- /* copy the address of the kernel symbol
- * corresponding to each function
- */
- ulen = min_t(u32, info.nr_jited_ksyms, ulen);
- user_ksyms = u64_to_user_ptr(info.jited_ksyms);
- if (prog->aux->func_cnt) {
- for (i = 0; i < ulen; i++) {
- ksym_addr = (unsigned long)
- prog->aux->func[i]->bpf_func;
- if (put_user((u64) ksym_addr,
- &user_ksyms[i]))
- return -EFAULT;
- }
- } else {
- ksym_addr = (unsigned long) prog->bpf_func;
- if (put_user((u64) ksym_addr, &user_ksyms[0]))
- return -EFAULT;
- }
- } else {
- info.jited_ksyms = 0;
- }
- }
- ulen = info.nr_jited_func_lens;
- info.nr_jited_func_lens = prog->aux->func_cnt ? : 1;
- if (ulen) {
- if (bpf_dump_raw_ok(file->f_cred)) {
- u32 __user *user_lens;
- u32 func_len, i;
- /* copy the JITed image lengths for each function */
- ulen = min_t(u32, info.nr_jited_func_lens, ulen);
- user_lens = u64_to_user_ptr(info.jited_func_lens);
- if (prog->aux->func_cnt) {
- for (i = 0; i < ulen; i++) {
- func_len =
- prog->aux->func[i]->jited_len;
- if (put_user(func_len, &user_lens[i]))
- return -EFAULT;
- }
- } else {
- func_len = prog->jited_len;
- if (put_user(func_len, &user_lens[0]))
- return -EFAULT;
- }
- } else {
- info.jited_func_lens = 0;
- }
- }
- if (prog->aux->btf)
- info.btf_id = btf_id(prog->aux->btf);
- ulen = info.nr_func_info;
- info.nr_func_info = prog->aux->func_info_cnt;
- if (info.nr_func_info && ulen) {
- char __user *user_finfo;
- user_finfo = u64_to_user_ptr(info.func_info);
- ulen = min_t(u32, info.nr_func_info, ulen);
- if (copy_to_user(user_finfo, prog->aux->func_info,
- info.func_info_rec_size * ulen))
- return -EFAULT;
- }
- ulen = info.nr_line_info;
- info.nr_line_info = prog->aux->nr_linfo;
- if (info.nr_line_info && ulen) {
- __u8 __user *user_linfo;
- user_linfo = u64_to_user_ptr(info.line_info);
- ulen = min_t(u32, info.nr_line_info, ulen);
- if (copy_to_user(user_linfo, prog->aux->linfo,
- info.line_info_rec_size * ulen))
- return -EFAULT;
- }
- ulen = info.nr_jited_line_info;
- if (prog->aux->jited_linfo)
- info.nr_jited_line_info = prog->aux->nr_linfo;
- else
- info.nr_jited_line_info = 0;
- if (info.nr_jited_line_info && ulen) {
- if (bpf_dump_raw_ok(file->f_cred)) {
- __u64 __user *user_linfo;
- u32 i;
- user_linfo = u64_to_user_ptr(info.jited_line_info);
- ulen = min_t(u32, info.nr_jited_line_info, ulen);
- for (i = 0; i < ulen; i++) {
- if (put_user((__u64)(long)prog->aux->jited_linfo[i],
- &user_linfo[i]))
- return -EFAULT;
- }
- } else {
- info.jited_line_info = 0;
- }
- }
- ulen = info.nr_prog_tags;
- info.nr_prog_tags = prog->aux->func_cnt ? : 1;
- if (ulen) {
- __u8 __user (*user_prog_tags)[BPF_TAG_SIZE];
- u32 i;
- user_prog_tags = u64_to_user_ptr(info.prog_tags);
- ulen = min_t(u32, info.nr_prog_tags, ulen);
- if (prog->aux->func_cnt) {
- for (i = 0; i < ulen; i++) {
- if (copy_to_user(user_prog_tags[i],
- prog->aux->func[i]->tag,
- BPF_TAG_SIZE))
- return -EFAULT;
- }
- } else {
- if (copy_to_user(user_prog_tags[0],
- prog->tag, BPF_TAG_SIZE))
- return -EFAULT;
- }
- }
- done:
- if (copy_to_user(uinfo, &info, info_len) ||
- put_user(info_len, &uattr->info.info_len))
- return -EFAULT;
- return 0;
- }
- static int bpf_map_get_info_by_fd(struct file *file,
- struct bpf_map *map,
- const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- struct bpf_map_info __user *uinfo = u64_to_user_ptr(attr->info.info);
- struct bpf_map_info info;
- u32 info_len = attr->info.info_len;
- int err;
- err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
- if (err)
- return err;
- info_len = min_t(u32, sizeof(info), info_len);
- memset(&info, 0, sizeof(info));
- info.type = map->map_type;
- info.id = map->id;
- info.key_size = map->key_size;
- info.value_size = map->value_size;
- info.max_entries = map->max_entries;
- info.map_flags = map->map_flags;
- memcpy(info.name, map->name, sizeof(map->name));
- if (map->btf) {
- info.btf_id = btf_id(map->btf);
- info.btf_key_type_id = map->btf_key_type_id;
- info.btf_value_type_id = map->btf_value_type_id;
- }
- info.btf_vmlinux_value_type_id = map->btf_vmlinux_value_type_id;
- if (bpf_map_is_dev_bound(map)) {
- err = bpf_map_offload_info_fill(&info, map);
- if (err)
- return err;
- }
- if (copy_to_user(uinfo, &info, info_len) ||
- put_user(info_len, &uattr->info.info_len))
- return -EFAULT;
- return 0;
- }
- static int bpf_btf_get_info_by_fd(struct file *file,
- struct btf *btf,
- const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- struct bpf_btf_info __user *uinfo = u64_to_user_ptr(attr->info.info);
- u32 info_len = attr->info.info_len;
- int err;
- err = bpf_check_uarg_tail_zero(uinfo, sizeof(*uinfo), info_len);
- if (err)
- return err;
- return btf_get_info_by_fd(btf, attr, uattr);
- }
- static int bpf_link_get_info_by_fd(struct file *file,
- struct bpf_link *link,
- const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- struct bpf_link_info __user *uinfo = u64_to_user_ptr(attr->info.info);
- struct bpf_link_info info;
- u32 info_len = attr->info.info_len;
- int err;
- err = bpf_check_uarg_tail_zero(uinfo, sizeof(info), info_len);
- if (err)
- return err;
- info_len = min_t(u32, sizeof(info), info_len);
- memset(&info, 0, sizeof(info));
- if (copy_from_user(&info, uinfo, info_len))
- return -EFAULT;
- info.type = link->type;
- info.id = link->id;
- info.prog_id = link->prog->aux->id;
- if (link->ops->fill_link_info) {
- err = link->ops->fill_link_info(link, &info);
- if (err)
- return err;
- }
- if (copy_to_user(uinfo, &info, info_len) ||
- put_user(info_len, &uattr->info.info_len))
- return -EFAULT;
- return 0;
- }
- #define BPF_OBJ_GET_INFO_BY_FD_LAST_FIELD info.info
- static int bpf_obj_get_info_by_fd(const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- int ufd = attr->info.bpf_fd;
- struct fd f;
- int err;
- if (CHECK_ATTR(BPF_OBJ_GET_INFO_BY_FD))
- return -EINVAL;
- f = fdget(ufd);
- if (!f.file)
- return -EBADFD;
- if (f.file->f_op == &bpf_prog_fops)
- err = bpf_prog_get_info_by_fd(f.file, f.file->private_data, attr,
- uattr);
- else if (f.file->f_op == &bpf_map_fops)
- err = bpf_map_get_info_by_fd(f.file, f.file->private_data, attr,
- uattr);
- else if (f.file->f_op == &btf_fops)
- err = bpf_btf_get_info_by_fd(f.file, f.file->private_data, attr, uattr);
- else if (f.file->f_op == &bpf_link_fops)
- err = bpf_link_get_info_by_fd(f.file, f.file->private_data,
- attr, uattr);
- else
- err = -EINVAL;
- fdput(f);
- return err;
- }
- #define BPF_BTF_LOAD_LAST_FIELD btf_log_level
- static int bpf_btf_load(const union bpf_attr *attr)
- {
- if (CHECK_ATTR(BPF_BTF_LOAD))
- return -EINVAL;
- if (!bpf_capable())
- return -EPERM;
- return btf_new_fd(attr);
- }
- #define BPF_BTF_GET_FD_BY_ID_LAST_FIELD btf_id
- static int bpf_btf_get_fd_by_id(const union bpf_attr *attr)
- {
- if (CHECK_ATTR(BPF_BTF_GET_FD_BY_ID))
- return -EINVAL;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- return btf_get_fd_by_id(attr->btf_id);
- }
- static int bpf_task_fd_query_copy(const union bpf_attr *attr,
- union bpf_attr __user *uattr,
- u32 prog_id, u32 fd_type,
- const char *buf, u64 probe_offset,
- u64 probe_addr)
- {
- char __user *ubuf = u64_to_user_ptr(attr->task_fd_query.buf);
- u32 len = buf ? strlen(buf) : 0, input_len;
- int err = 0;
- if (put_user(len, &uattr->task_fd_query.buf_len))
- return -EFAULT;
- input_len = attr->task_fd_query.buf_len;
- if (input_len && ubuf) {
- if (!len) {
- /* nothing to copy, just make ubuf NULL terminated */
- char zero = '\0';
- if (put_user(zero, ubuf))
- return -EFAULT;
- } else if (input_len >= len + 1) {
- /* ubuf can hold the string with NULL terminator */
- if (copy_to_user(ubuf, buf, len + 1))
- return -EFAULT;
- } else {
- /* ubuf cannot hold the string with NULL terminator,
- * do a partial copy with NULL terminator.
- */
- char zero = '\0';
- err = -ENOSPC;
- if (copy_to_user(ubuf, buf, input_len - 1))
- return -EFAULT;
- if (put_user(zero, ubuf + input_len - 1))
- return -EFAULT;
- }
- }
- if (put_user(prog_id, &uattr->task_fd_query.prog_id) ||
- put_user(fd_type, &uattr->task_fd_query.fd_type) ||
- put_user(probe_offset, &uattr->task_fd_query.probe_offset) ||
- put_user(probe_addr, &uattr->task_fd_query.probe_addr))
- return -EFAULT;
- return err;
- }
- #define BPF_TASK_FD_QUERY_LAST_FIELD task_fd_query.probe_addr
- static int bpf_task_fd_query(const union bpf_attr *attr,
- union bpf_attr __user *uattr)
- {
- pid_t pid = attr->task_fd_query.pid;
- u32 fd = attr->task_fd_query.fd;
- const struct perf_event *event;
- struct files_struct *files;
- struct task_struct *task;
- struct file *file;
- int err;
- if (CHECK_ATTR(BPF_TASK_FD_QUERY))
- return -EINVAL;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- if (attr->task_fd_query.flags != 0)
- return -EINVAL;
- task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
- if (!task)
- return -ENOENT;
- files = get_files_struct(task);
- put_task_struct(task);
- if (!files)
- return -ENOENT;
- err = 0;
- spin_lock(&files->file_lock);
- file = fcheck_files(files, fd);
- if (!file)
- err = -EBADF;
- else
- get_file(file);
- spin_unlock(&files->file_lock);
- put_files_struct(files);
- if (err)
- goto out;
- if (file->f_op == &bpf_link_fops) {
- struct bpf_link *link = file->private_data;
- if (link->ops == &bpf_raw_tp_link_lops) {
- struct bpf_raw_tp_link *raw_tp =
- container_of(link, struct bpf_raw_tp_link, link);
- struct bpf_raw_event_map *btp = raw_tp->btp;
- err = bpf_task_fd_query_copy(attr, uattr,
- raw_tp->link.prog->aux->id,
- BPF_FD_TYPE_RAW_TRACEPOINT,
- btp->tp->name, 0, 0);
- goto put_file;
- }
- goto out_not_supp;
- }
- event = perf_get_event(file);
- if (!IS_ERR(event)) {
- u64 probe_offset, probe_addr;
- u32 prog_id, fd_type;
- const char *buf;
- err = bpf_get_perf_event_info(event, &prog_id, &fd_type,
- &buf, &probe_offset,
- &probe_addr);
- if (!err)
- err = bpf_task_fd_query_copy(attr, uattr, prog_id,
- fd_type, buf,
- probe_offset,
- probe_addr);
- goto put_file;
- }
- out_not_supp:
- err = -ENOTSUPP;
- put_file:
- fput(file);
- out:
- return err;
- }
- #define BPF_MAP_BATCH_LAST_FIELD batch.flags
- #define BPF_DO_BATCH(fn) \
- do { \
- if (!fn) { \
- err = -ENOTSUPP; \
- goto err_put; \
- } \
- err = fn(map, attr, uattr); \
- } while (0)
- static int bpf_map_do_batch(const union bpf_attr *attr,
- union bpf_attr __user *uattr,
- int cmd)
- {
- bool has_read = cmd == BPF_MAP_LOOKUP_BATCH ||
- cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH;
- bool has_write = cmd != BPF_MAP_LOOKUP_BATCH;
- struct bpf_map *map;
- int err, ufd;
- struct fd f;
- if (CHECK_ATTR(BPF_MAP_BATCH))
- return -EINVAL;
- ufd = attr->batch.map_fd;
- f = fdget(ufd);
- map = __bpf_map_get(f);
- if (IS_ERR(map))
- return PTR_ERR(map);
- if (has_write)
- bpf_map_write_active_inc(map);
- if (has_read && !(map_get_sys_perms(map, f) & FMODE_CAN_READ)) {
- err = -EPERM;
- goto err_put;
- }
- if (has_write && !(map_get_sys_perms(map, f) & FMODE_CAN_WRITE)) {
- err = -EPERM;
- goto err_put;
- }
- if (cmd == BPF_MAP_LOOKUP_BATCH)
- BPF_DO_BATCH(map->ops->map_lookup_batch);
- else if (cmd == BPF_MAP_LOOKUP_AND_DELETE_BATCH)
- BPF_DO_BATCH(map->ops->map_lookup_and_delete_batch);
- else if (cmd == BPF_MAP_UPDATE_BATCH)
- BPF_DO_BATCH(map->ops->map_update_batch);
- else
- BPF_DO_BATCH(map->ops->map_delete_batch);
- err_put:
- if (has_write)
- bpf_map_write_active_dec(map);
- fdput(f);
- return err;
- }
- static int tracing_bpf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
- {
- if (attr->link_create.attach_type != prog->expected_attach_type)
- return -EINVAL;
- if (prog->expected_attach_type == BPF_TRACE_ITER)
- return bpf_iter_link_attach(attr, prog);
- else if (prog->type == BPF_PROG_TYPE_EXT)
- return bpf_tracing_prog_attach(prog,
- attr->link_create.target_fd,
- attr->link_create.target_btf_id);
- return -EINVAL;
- }
- #define BPF_LINK_CREATE_LAST_FIELD link_create.iter_info_len
- static int link_create(union bpf_attr *attr)
- {
- enum bpf_prog_type ptype;
- struct bpf_prog *prog;
- int ret;
- if (CHECK_ATTR(BPF_LINK_CREATE))
- return -EINVAL;
- prog = bpf_prog_get(attr->link_create.prog_fd);
- if (IS_ERR(prog))
- return PTR_ERR(prog);
- ret = bpf_prog_attach_check_attach_type(prog,
- attr->link_create.attach_type);
- if (ret)
- goto out;
- if (prog->type == BPF_PROG_TYPE_EXT) {
- ret = tracing_bpf_link_attach(attr, prog);
- goto out;
- }
- ptype = attach_type_to_prog_type(attr->link_create.attach_type);
- if (ptype == BPF_PROG_TYPE_UNSPEC || ptype != prog->type) {
- ret = -EINVAL;
- goto out;
- }
- switch (ptype) {
- case BPF_PROG_TYPE_CGROUP_SKB:
- case BPF_PROG_TYPE_CGROUP_SOCK:
- case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
- case BPF_PROG_TYPE_SOCK_OPS:
- case BPF_PROG_TYPE_CGROUP_DEVICE:
- case BPF_PROG_TYPE_CGROUP_SYSCTL:
- case BPF_PROG_TYPE_CGROUP_SOCKOPT:
- ret = cgroup_bpf_link_attach(attr, prog);
- break;
- case BPF_PROG_TYPE_TRACING:
- ret = tracing_bpf_link_attach(attr, prog);
- break;
- case BPF_PROG_TYPE_FLOW_DISSECTOR:
- case BPF_PROG_TYPE_SK_LOOKUP:
- ret = netns_bpf_link_create(attr, prog);
- break;
- #ifdef CONFIG_NET
- case BPF_PROG_TYPE_XDP:
- ret = bpf_xdp_link_attach(attr, prog);
- break;
- #endif
- default:
- ret = -EINVAL;
- }
- out:
- if (ret < 0)
- bpf_prog_put(prog);
- return ret;
- }
- #define BPF_LINK_UPDATE_LAST_FIELD link_update.old_prog_fd
- static int link_update(union bpf_attr *attr)
- {
- struct bpf_prog *old_prog = NULL, *new_prog;
- struct bpf_link *link;
- u32 flags;
- int ret;
- if (CHECK_ATTR(BPF_LINK_UPDATE))
- return -EINVAL;
- flags = attr->link_update.flags;
- if (flags & ~BPF_F_REPLACE)
- return -EINVAL;
- link = bpf_link_get_from_fd(attr->link_update.link_fd);
- if (IS_ERR(link))
- return PTR_ERR(link);
- new_prog = bpf_prog_get(attr->link_update.new_prog_fd);
- if (IS_ERR(new_prog)) {
- ret = PTR_ERR(new_prog);
- goto out_put_link;
- }
- if (flags & BPF_F_REPLACE) {
- old_prog = bpf_prog_get(attr->link_update.old_prog_fd);
- if (IS_ERR(old_prog)) {
- ret = PTR_ERR(old_prog);
- old_prog = NULL;
- goto out_put_progs;
- }
- } else if (attr->link_update.old_prog_fd) {
- ret = -EINVAL;
- goto out_put_progs;
- }
- if (link->ops->update_prog)
- ret = link->ops->update_prog(link, new_prog, old_prog);
- else
- ret = -EINVAL;
- out_put_progs:
- if (old_prog)
- bpf_prog_put(old_prog);
- if (ret)
- bpf_prog_put(new_prog);
- out_put_link:
- bpf_link_put(link);
- return ret;
- }
- #define BPF_LINK_DETACH_LAST_FIELD link_detach.link_fd
- static int link_detach(union bpf_attr *attr)
- {
- struct bpf_link *link;
- int ret;
- if (CHECK_ATTR(BPF_LINK_DETACH))
- return -EINVAL;
- link = bpf_link_get_from_fd(attr->link_detach.link_fd);
- if (IS_ERR(link))
- return PTR_ERR(link);
- if (link->ops->detach)
- ret = link->ops->detach(link);
- else
- ret = -EOPNOTSUPP;
- bpf_link_put(link);
- return ret;
- }
- static struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
- {
- return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? link : ERR_PTR(-ENOENT);
- }
- struct bpf_link *bpf_link_by_id(u32 id)
- {
- struct bpf_link *link;
- if (!id)
- return ERR_PTR(-ENOENT);
- spin_lock_bh(&link_idr_lock);
- /* before link is "settled", ID is 0, pretend it doesn't exist yet */
- link = idr_find(&link_idr, id);
- if (link) {
- if (link->id)
- link = bpf_link_inc_not_zero(link);
- else
- link = ERR_PTR(-EAGAIN);
- } else {
- link = ERR_PTR(-ENOENT);
- }
- spin_unlock_bh(&link_idr_lock);
- return link;
- }
- #define BPF_LINK_GET_FD_BY_ID_LAST_FIELD link_id
- static int bpf_link_get_fd_by_id(const union bpf_attr *attr)
- {
- struct bpf_link *link;
- u32 id = attr->link_id;
- int fd;
- if (CHECK_ATTR(BPF_LINK_GET_FD_BY_ID))
- return -EINVAL;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- link = bpf_link_by_id(id);
- if (IS_ERR(link))
- return PTR_ERR(link);
- fd = bpf_link_new_fd(link);
- if (fd < 0)
- bpf_link_put(link);
- return fd;
- }
- DEFINE_MUTEX(bpf_stats_enabled_mutex);
- static int bpf_stats_release(struct inode *inode, struct file *file)
- {
- mutex_lock(&bpf_stats_enabled_mutex);
- static_key_slow_dec(&bpf_stats_enabled_key.key);
- mutex_unlock(&bpf_stats_enabled_mutex);
- return 0;
- }
- static const struct file_operations bpf_stats_fops = {
- .release = bpf_stats_release,
- };
- static int bpf_enable_runtime_stats(void)
- {
- int fd;
- mutex_lock(&bpf_stats_enabled_mutex);
- /* Set a very high limit to avoid overflow */
- if (static_key_count(&bpf_stats_enabled_key.key) > INT_MAX / 2) {
- mutex_unlock(&bpf_stats_enabled_mutex);
- return -EBUSY;
- }
- fd = anon_inode_getfd("bpf-stats", &bpf_stats_fops, NULL, O_CLOEXEC);
- if (fd >= 0)
- static_key_slow_inc(&bpf_stats_enabled_key.key);
- mutex_unlock(&bpf_stats_enabled_mutex);
- return fd;
- }
- #define BPF_ENABLE_STATS_LAST_FIELD enable_stats.type
- static int bpf_enable_stats(union bpf_attr *attr)
- {
- if (CHECK_ATTR(BPF_ENABLE_STATS))
- return -EINVAL;
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- switch (attr->enable_stats.type) {
- case BPF_STATS_RUN_TIME:
- return bpf_enable_runtime_stats();
- default:
- break;
- }
- return -EINVAL;
- }
- #define BPF_ITER_CREATE_LAST_FIELD iter_create.flags
- static int bpf_iter_create(union bpf_attr *attr)
- {
- struct bpf_link *link;
- int err;
- if (CHECK_ATTR(BPF_ITER_CREATE))
- return -EINVAL;
- if (attr->iter_create.flags)
- return -EINVAL;
- link = bpf_link_get_from_fd(attr->iter_create.link_fd);
- if (IS_ERR(link))
- return PTR_ERR(link);
- err = bpf_iter_new_fd(link);
- bpf_link_put(link);
- return err;
- }
- #define BPF_PROG_BIND_MAP_LAST_FIELD prog_bind_map.flags
- static int bpf_prog_bind_map(union bpf_attr *attr)
- {
- struct bpf_prog *prog;
- struct bpf_map *map;
- struct bpf_map **used_maps_old, **used_maps_new;
- int i, ret = 0;
- if (CHECK_ATTR(BPF_PROG_BIND_MAP))
- return -EINVAL;
- if (attr->prog_bind_map.flags)
- return -EINVAL;
- prog = bpf_prog_get(attr->prog_bind_map.prog_fd);
- if (IS_ERR(prog))
- return PTR_ERR(prog);
- map = bpf_map_get(attr->prog_bind_map.map_fd);
- if (IS_ERR(map)) {
- ret = PTR_ERR(map);
- goto out_prog_put;
- }
- mutex_lock(&prog->aux->used_maps_mutex);
- used_maps_old = prog->aux->used_maps;
- for (i = 0; i < prog->aux->used_map_cnt; i++)
- if (used_maps_old[i] == map) {
- bpf_map_put(map);
- goto out_unlock;
- }
- used_maps_new = kmalloc_array(prog->aux->used_map_cnt + 1,
- sizeof(used_maps_new[0]),
- GFP_KERNEL);
- if (!used_maps_new) {
- ret = -ENOMEM;
- goto out_unlock;
- }
- memcpy(used_maps_new, used_maps_old,
- sizeof(used_maps_old[0]) * prog->aux->used_map_cnt);
- used_maps_new[prog->aux->used_map_cnt] = map;
- prog->aux->used_map_cnt++;
- prog->aux->used_maps = used_maps_new;
- kfree(used_maps_old);
- out_unlock:
- mutex_unlock(&prog->aux->used_maps_mutex);
- if (ret)
- bpf_map_put(map);
- out_prog_put:
- bpf_prog_put(prog);
- return ret;
- }
- SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
- {
- union bpf_attr attr;
- int err;
- if (sysctl_unprivileged_bpf_disabled && !bpf_capable())
- return -EPERM;
- err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size);
- if (err)
- return err;
- size = min_t(u32, size, sizeof(attr));
- /* copy attributes from user space, may be less than sizeof(bpf_attr) */
- memset(&attr, 0, sizeof(attr));
- if (copy_from_user(&attr, uattr, size) != 0)
- return -EFAULT;
- trace_android_vh_check_bpf_syscall(cmd, &attr, size);
- err = security_bpf(cmd, &attr, size);
- if (err < 0)
- return err;
- switch (cmd) {
- case BPF_MAP_CREATE:
- err = map_create(&attr);
- break;
- case BPF_MAP_LOOKUP_ELEM:
- err = map_lookup_elem(&attr);
- break;
- case BPF_MAP_UPDATE_ELEM:
- err = map_update_elem(&attr);
- break;
- case BPF_MAP_DELETE_ELEM:
- err = map_delete_elem(&attr);
- break;
- case BPF_MAP_GET_NEXT_KEY:
- err = map_get_next_key(&attr);
- break;
- case BPF_MAP_FREEZE:
- err = map_freeze(&attr);
- break;
- case BPF_PROG_LOAD:
- err = bpf_prog_load(&attr, uattr);
- break;
- case BPF_OBJ_PIN:
- err = bpf_obj_pin(&attr);
- break;
- case BPF_OBJ_GET:
- err = bpf_obj_get(&attr);
- break;
- case BPF_PROG_ATTACH:
- err = bpf_prog_attach(&attr);
- break;
- case BPF_PROG_DETACH:
- err = bpf_prog_detach(&attr);
- break;
- case BPF_PROG_QUERY:
- err = bpf_prog_query(&attr, uattr);
- break;
- case BPF_PROG_TEST_RUN:
- err = bpf_prog_test_run(&attr, uattr);
- break;
- case BPF_PROG_GET_NEXT_ID:
- err = bpf_obj_get_next_id(&attr, uattr,
- &prog_idr, &prog_idr_lock);
- break;
- case BPF_MAP_GET_NEXT_ID:
- err = bpf_obj_get_next_id(&attr, uattr,
- &map_idr, &map_idr_lock);
- break;
- case BPF_BTF_GET_NEXT_ID:
- err = bpf_obj_get_next_id(&attr, uattr,
- &btf_idr, &btf_idr_lock);
- break;
- case BPF_PROG_GET_FD_BY_ID:
- err = bpf_prog_get_fd_by_id(&attr);
- break;
- case BPF_MAP_GET_FD_BY_ID:
- err = bpf_map_get_fd_by_id(&attr);
- break;
- case BPF_OBJ_GET_INFO_BY_FD:
- err = bpf_obj_get_info_by_fd(&attr, uattr);
- break;
- case BPF_RAW_TRACEPOINT_OPEN:
- err = bpf_raw_tracepoint_open(&attr);
- break;
- case BPF_BTF_LOAD:
- err = bpf_btf_load(&attr);
- break;
- case BPF_BTF_GET_FD_BY_ID:
- err = bpf_btf_get_fd_by_id(&attr);
- break;
- case BPF_TASK_FD_QUERY:
- err = bpf_task_fd_query(&attr, uattr);
- break;
- case BPF_MAP_LOOKUP_AND_DELETE_ELEM:
- err = map_lookup_and_delete_elem(&attr);
- break;
- case BPF_MAP_LOOKUP_BATCH:
- err = bpf_map_do_batch(&attr, uattr, BPF_MAP_LOOKUP_BATCH);
- break;
- case BPF_MAP_LOOKUP_AND_DELETE_BATCH:
- err = bpf_map_do_batch(&attr, uattr,
- BPF_MAP_LOOKUP_AND_DELETE_BATCH);
- break;
- case BPF_MAP_UPDATE_BATCH:
- err = bpf_map_do_batch(&attr, uattr, BPF_MAP_UPDATE_BATCH);
- break;
- case BPF_MAP_DELETE_BATCH:
- err = bpf_map_do_batch(&attr, uattr, BPF_MAP_DELETE_BATCH);
- break;
- case BPF_LINK_CREATE:
- err = link_create(&attr);
- break;
- case BPF_LINK_UPDATE:
- err = link_update(&attr);
- break;
- case BPF_LINK_GET_FD_BY_ID:
- err = bpf_link_get_fd_by_id(&attr);
- break;
- case BPF_LINK_GET_NEXT_ID:
- err = bpf_obj_get_next_id(&attr, uattr,
- &link_idr, &link_idr_lock);
- break;
- case BPF_ENABLE_STATS:
- err = bpf_enable_stats(&attr);
- break;
- case BPF_ITER_CREATE:
- err = bpf_iter_create(&attr);
- break;
- case BPF_LINK_DETACH:
- err = link_detach(&attr);
- break;
- case BPF_PROG_BIND_MAP:
- err = bpf_prog_bind_map(&attr);
- break;
- default:
- err = -EINVAL;
- break;
- }
- return err;
- }
|