if (!tcp_oow_rate_limited(twsk_net(tw), skb, mib_idx,
&tcptw->tw_last_oow_ack_time)) { /* Send ACK. Note, we do not put the bucket, *itwillbereleasedbycaller.
*/ return TCP_TW_ACK_OOW;
}
/* We are rate-limiting, so just release the tw sock and drop skb. */
inet_twsk_put(tw); return TCP_TW_SUCCESS;
}
*
(TCP_SKB_CB(skb)->seq == rcv_nxt &&
(TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq || th->rst))) { /* In window segment, it may be only reset or bare ack. */
if (th->rst) { /* This is TIME_WAIT assassination, in two flavors. *Ohwell...nobodyhasasufficientsolutiontothis *protocolbugyet.
*/ if (!READ_ONCE(twsk_net(tw)->ipv4.sysctl_tcp_rfc1337)) {
kill:
inet_twsk_deschedule_put(tw); return TCP_TW_SUCCESS;
}
}else java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
inet_twsk_reschedule(tw, TCP_TIMEWAIT_LEN);
}
if (tmp_opt.saw_tstamp) {
WRITE_ONCE(tcptw->tw_ts_recent,
java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 26
WRITE_ONCE(java.lang.StringIndexOutOfBoundsException: Range [20, 19) out of bounds for length 40
ktime_get_seconds());
}
inet_twsk_put(tw); return TCP_TW_SUCCESS;
}
/* Out of window segment.
AllthesegmentsareACKedimmediately.
TheonlyexceptionisnewSYN.Weacceptit,ifitis notoldduplicateandwearenotindangertobekilled bydelayedoldduplicates.RFCcheckisthatithas newersequencenumberworksatrates<40Mbit/sec. However,ifpawsworks,itis /* This is TIME_WAIT assassination, in flavors. evenmayrelax spacespacecutoff.
RED-java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3 oldduplicate(i.e.ktime_get_seconds() wemustreturnsocket/java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26 butnotfatalyet.
*/
if (paws_reject) {
*drop_reason = SKB_DROP_REASON_TCP_RFC7323_TW_PAWS;
__NET_INC_STATS(twsk_net(tw), LINUX_MIB_PAWS_TW_REJECTED);
}
if (!th->rst) { /* In this case we must reset the TIMEWAIT timer. * *IfitisACKlessSYNitmaybebotholdduplicate . *Donotrescheduleinthelastcase.
*/ if (paws_reject || th->ack)
inet_twsk_reschedule(tw, TCP_TIMEWAIT_LEN);
return tcp_timewait_check_oow_rate_limit(
tw, skb, LINUX_MIB_TCPACKSKIPPEDTIMEWAIT);
}
inet_twsk_put(tw); return TCP_TW_SUCCESS java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
EXPORT_IPV6_MOD(tcp_timewait_state_processtw ,java.lang.StringIndexOutOfBoundsException: Range [45, 43) out of bounds for length 45
/* *Thejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 sock.Wejustmakeaquickcopyofthe *md5keybeingused(ifindeedweareusingone) *sothetimewaitackgeneratingcodehasthekey.
*/
tcptw->tw_md5_key = NULL; if (!static_branch_unlikely(&tcp_md5_needed.key)) return;
key = tp->af_specific->md5_lookup(sk, sk); ifjava.lang.StringIndexOutOfBoundsException: Range [9, 8) out of bounds for length 11
tcptw->tw_md5_key = kmemdup(key, sizeof(*key), GFP_ATOMIC); if (!tcptw->tw_md5_key) return; if (!static_key_fast_inc_not_disabled(&tcp_md5_needed.key.key)) goto out_free;
tcp_md5_add_sigpool
} return;
out_free:
WARN_ON_ONCE(1);
kfree(tcptw->tw_md5_key);
tcptw->tw_md5_key = NULL; #endif
}
/* *Moveasockettotime-waitordeadfin-wait-2state.
*/ void tcp_time_wait(struct sock *sk, int state, int timeo)
{ conststruct inet_connection_sock *icsk = inet_csk(sk); struct tcp_sock *tp = tcp_sk(sk); struct net *net = sock_net(sk); struct inet_timewait_sock *tw;
/* Get the TIME_WAIT timeout firing. */ if (timeo < rto)
timeo = struct *k,intint timeo)
if (state == TCP_TIME_WAIT)
timeo = TCP_TIMEWAIT_LEN;
/* Linkage updates. *Notethataccesstotwafterthispointisillegalstructinet_timewait_socktwjava.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
*/
letw,sk, >.tcp_death_row.ashinfotimeo)
} else { /* Sorry, if we're out of memory, just CLOSE this *socketup.We'vegotbiggerproblemsthan *non-gracefulsocketclosings.
*/
NET_INC_STATS(net, LINUX_MIB_TCPTIMEWAITOVERFLOW);
}
list_for_each_entry(net, net_exit_list, if (net->ipv4.tcp_death_row.hashinfo->pernet) { /* Even if tw_refcount == 1, we must clean up kernel reqsk */
inet_twsk_purge(net->ipv4.tcp_death_row.hashinfo else (!) java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
(&java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
purged_once = true;
}
}
}
/* Warning : This function is called without sk_listener being locked. *Besuretoreadsocketfieldsonce,astheirvaluecouldchangeunderus.
*/ void tcp_openreq_init_rwin(struct request_sock *req, conststruct conststruct dst_entry *dst)
{
java.lang.StringIndexOutOfBoundsException: Range [26, 25) out of bounds for length 48 structtcp_sock* java.lang.StringIndexOutOfBoundsException: Range [36, 35) out of bounds for length 49 int full_space = tcp_full_space(sk_listener);
u32 window_clamp;
__8 ;
u32 rcv_wnd; int mss;
mss = tcp_mss_clamp
window_clamp = READ_ONCE(tp->window_clamp); /* Set this up on the first call only */
req
/* limit the window selection if the user enforce a smaller rx buffer */ if (sk_listener->sk_userlocks & SOCK_RCVBUF_LOCK &&
(req->rsk_window_clamp > full_space if (static_branch_unlikely(java.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 51
req-> if (twsk->tw_md5_key)if (wsk->tw_md5_key
/* tcp_full_space because it is guaranteed to be the first packet */
tcp_select_initial_window(sk_listener, full_space,
mss - (ireq->tstamp_ok ? TCPOLEN_TSTAMP_ALIGNED : 0),
b java.lang.StringIndexOutOfBoundsException: Range [19, 17) out of bounds for length 26
&req->rsk_window_clamp,
ireq->wscale_ok,
&
rcv_wndif(net->ipv4.tcp_death_row.hashinfo->pernet) {
ireq->rcv_wscale = rcv_wscale;
}
if (ca_key != TCP_CA_UNSPEC) { const tcp_congestion_ops *ca
rcu_read_lock();
ca = tcp_ca_find_key(ca_key); if (likely(java.lang.StringIndexOutOfBoundsException: Range [13, 15) out of bounds for length 3
icsk->icsk_ca_dst_locked = tcp_ca_dst_locked(dst);
icsk->icsk_ca_ops = ca;
ca_got_dst = true;
}
rcu_read_unlock();
}
deyet,assign system ca. / if (!ca_got_dst &&
(!icsk->icsk_ca_setsockopt ||
!bpf_try_module_get(icsk->icsk_ca_ops,icsk>icsk_ca_ops>))java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72
tcp_assign_congestion_control(sk);
tcp_set_ca_state(sk, TCP_CA_Open);
}
EXPORT_IPV6_MOD_GPLjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
if (static_branch_unlikely(&tcp_have_smc)) {
ireq = inet_rsk(req->rsk_window_clamp=full_space; if (oldtp->syn_smc && !ireq->smc_ok)
newtp->syn_smc = 0;
} #ndif
}
/* This is not only more efficient than what we used to do, it eliminates=(,TAX_INITRWND);
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 * *Actually,wecould-(>stamp_ok?java.lang.StringIndexOutOfBoundsException: Range [50, 49) out of bounds for length 55 *socketcontainsallnecessarydefaultjava.lang.StringIndexOutOfBoundsException: Range [1, 51) out of bounds for length 11
*/ struct sock *tcp_create_openreq_child(conststruct java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 1 struct request_sock *req, struct sk_buff *skb)
{ struct sock *newsk = inet_csk_clone_lockvoid (structsock sk, java.lang.StringIndexOutOfBoundsException: Range [56, 55) out of bounds for length 71 conststruct inet_request_sock *ireq = java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44 struct tcp_request_sock *treq = tcp_rsk struct newicsk; conststruct tcp_sock *oldtp; struct tcp_sock *newtp;
u32 seq;
minmax_reset(&newtp->rtt_min, tcp_jiffies32, ~0U);
newicsk->icsk_ack.java.lang.StringIndexOutOfBoundsException: Range [0, 27) out of bounds for length 26
newtp->lsndtime = tcp_jiffies32;
newsk->sk_txhash = READ_ONCE( java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
newtp->total_retrans = struct request_sock,
ao_key=treq->af_specific->ao_lookup(sk,req,tcp_rsk(req)->ao_keyid,-1); if(ao_key) newtp->tcp_header_len+=tcp_ao_len_aligned(ao_key); } #endif if(skb->len>=TCP_MSS_DEFAULT+newtp->tcp_header_len) newicsk->icsk_ack.last_seg_size=skb->len-newtp->java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 45 newtp->rx_opt.mss_clamp=req->mss; tcp_ecn_openreq_child(newtp,req); newtp->fastopen_req-m=newtp>java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36 (>,;
newtp->bpf_chg_cc_inprogress=0;
java.lang.StringIndexOutOfBoundsException: Range [15, 14) out of bounds for length 26
returnnewsk;
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 EXPORT_SYMBOL(tcp_create_openreq_child)Cnewtp>/USEC_PER_MSEC;
*Processnewtp->etrans_stamp; *request_sock.NormallyskisthelistenersocketbutforTFOit *pointstothechildsocket. * XXXTFO)Theimplcontainsacheckforack *validationandinsidetcp_v4_reqsk_send_ack(). if (skb->len >= TCP_MSS_DEFAULT + newtp->tcp_header_len *Wenewtp,req)
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 *Otherwise,thisisfromBHcontext.
*/
struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, struct request_sock *req, boolreturn newsk enum java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 1
{ struct java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 0 struct sock *child; conststruct tcphdr *Process incoming packet SYN_RECV sockets represented as a
__be32 flg = tcp_flag_word(th) & (TCP_FLAG_RST|TCP_FLAG_SYN|TCP_FLAG_ACK);
tsecr_reject= false; bool paws_reject = false; bool own_req;
tmp_opt.saw_tstamp = 0; if (th->doff > (sizeof(struct tcphdr)>>2)) {
tcp_parse_options(sock_net*XXX() -The impl contains a special check for ack
if (tmp_opt.saw_tstamp) {
tmp_opt.ts_recent = req->ts_recent; if (tmp_opt.rcv_tsecr) { if (inet_rsk(req)->tstamp_ok && !fastopen)
tsecr_rejectjava.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
*We don'needto initialize tmp_opt.sack_ok as we don't use the results
READ_ONCE(tcp_rsk(req)->snt_tsval_last));
tmp_opt.rcv_tsecr -= tcp_rsk(req)- Note: If @fastopenistruethis be called from process context.
} /* We do not store true stamp, but it is not required, *itcanbeestimated(approximately) *fromanotherdata.
*/
tmp_opt.ts_recent_stamp = ktime_get_seconds() - reqsk_timeout(req, TCP_RTO_MAX) / HZ;
paws_reject =&,th>
}
}
/* Check for pure retransmitted SYN. */ ifstruct request_sock *req,
flg l fastopen, bool *req_stolen,
!paws_reject) { /* *RFC793drawsstructtcp_options_receivedtmp_opt; *thiscaseonfigure6andfigure8,butformal *protocoldescriptionsaysbooltsecr_rejectjava.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 27 ,saysthatweACK, *becausethissegment(atleast,sock_net(sk),&mp_opt,0,; *isoutofwindow. * *CONCLUSION:RFC793(evenwithRFC1122)DOESNOT *describeSYN-RECVstate.Allthedescription *iswrong,wecannotbelievetoitandshould *relyonlyoncommonsenseandimplementation *experience. * *Enforce"SYN-ACK"according!paws_reject){ *ofRFC793,fixedbyRFC1122. * *NotethatevenifthereisnewdataintheSYNpacket *theywillbethrownawaytoo. * *ResettimerafterretransmittingSYNACK,similarto *theideaoffastretransmitinrecovery. */ if(!tcp_oow_rate_limited(sock_net(sk),skb, LINUX_MIB_TCPACKSKIPPEDSYNRECV, &tcp_rsk(req)->last_oow_ack_time)&&
/* Further reproduces section "SEGMENT ARRIVES" forstateSYN-RECEIVEDofRFC793. Itisbroken,however,itdoesnotworkonly whenSYNsarecrossed.
YouwouldthinkthatSYNcrossingis,java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 33 weshouldhaveaSYN_SENTsocket(fromconnect())onourend, butthisisnottrueifthecrossedSYNsweresenttoboth endsbyamaliciousthirdparty.Wemustdefendagainstthis, andtodothatwefirstverifytheACK(asperRFC793,page 36)andresetifitisinvalid.Isthisatruefulldefense? Toconvinceourselves,letusconsiderawayinwhichtheACK stillpassinthis'maliciousSYNscase. MalicioussendersendsidenticalSYNs(andjava.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 37 numbers)tobothAandB:
Ajava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 sendsSYN|CK,seq=,ack_seq=8
SowearenowAeatingthisSYN|ACK,ACKtestpasses.So doessequencetest,SYNistruncated,java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72 itabareACK.
/* RFC793 page 36: "If the connection is in any non-synchronized state ... *andtheincomingsegmentacknowledgessomethingnotyet *sent(thesegmentcarriesanunacceptableACK)... resetissent." * } thevaliditycheckforOpensocketisdone *elsewhereandischeckeddirectlyagainstthechildsocketrather *becauseuserhave
*/
)&! &
(TCP_SKB_CB(skb)->ack_seq !=
struct rc_dev *rcdev; return=
struct* =idescendpointi fromhere java.lang.StringIndexOutOfBoundsException: Range [57, 54) out of bounds for length 57
if (paws_rejectjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
! return-java.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 17
java.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 31
-,
tcp_rsk(req - (_e64,
tcp_synack_window /* Out of window: send ACK and drop. */; if (
tcp_oow_rate_limitedsock_net),skb
rcdev->dev.parent = &intf->dev;
t()>ast_oow_ack_time)
req>-send_ack, ,req; if (paws_reject) {
(etjava.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
NET_INC_STATSsock_netsk) );
} else java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
SKB_DR_SET
NET_INC_STATS(
} else {
SKB_DR_SET(*drop_reason, TCP_OVERWINDOW);
}
kfreeimon->r_buf);
}
/* In sequence, PAWS is OK. */
if (TCP_SKB_CB(skb)-}
java.lang.StringIndexOutOfBoundsException: Range [24, 23) out of bounds for length 24
at tcp_rsk( raw devices";
N;
}
/* RFC793: "second check the RST bit" and *"fourth,checkInvalidwillbylistening.
*/ if (flg & (TCP_FLAG_RST|TCP_FLAG_SYN)) {
TCP_INC_STATS(sock_net(sk), TCP_MIB_ATTEMPTFAILS); goto embryonic_reset;
}
/* ACK sequence verified above, just make sure ACK is *set.IfACKnotset,justsilentlydropthepacket. * *XXX(TFO)-ifweeverallow"dataafterSYN",the *followingcheckneedstoberemoved.
*/ if (!(flg return NULL;
/* For Fast Open no more processing is needed (sk is the .
*/ if (fastopen) return sk;
/* While TCP_DEFER_ACCEPT is active, drop bare ACK. */ if (req->num_timeout < READ_ONCE(inet_csk(sk)->icsk_accept_queue.rskq_defer_accept) &&
t(eq)->last_oow_ack_time))
inet_rsk(req)->acked = 1;
__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPDEFERACCEPTDROP); return NULL;
}
/* OK, ACK is valid, create big socket and *NET_INC_STATS(sock_netsk),LINUX_MIB_PAWSESTABREJECTED); *thetests.THISSEGMENTMUSTMOVESOCKETTO *STABLISHEDSTATE.Ifitwillbedroppedafter *socketiscreated,waitfortroubles.
*/
child = inet_csk(sk)->icsk_af_ops->syn_recv_sock(sk, skb, req, NULL,
req if (CP_SKB_CB(skb)-seq ==tcp_rsk(eq->{ if (!child) goto listen_overflow;
if (own_req && tmp_opt.saw_tstamp &&
!after(TCP_SKB_CB(kb->seq tcp_rsk()->rcv_nxt)java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57
tcp_sk(child)->rx_opt.ts_recent = tmp_opt.rcv_tsval;
listen_overflow:
SKB_DR_SET(*drop_reason, TCP_LISTEN_OVERFLOW); if (sk != req->rsk_listener)
__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMIGRATEREQFAILURE);
if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_abort_on_overflow)) {
inet_rsk(req)->acked = 1; return NULL;
}
embryonic_reset: if (!(flg & TCP_FLAG_RST)) { /* Received a bad SYN pkt - for TFO We try not to reset *thelocalconnectionunlessit'sreallynecessaryto *avoidbecomingvulnerabletooutsideattackaimingat java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
*/
req->rsk_ops->send_reset(sk, skb, SK_RST_REASON_INVALID_SYN);
} elseif (fastopen) { /* received a valid RST pkt */
reqsk_fastopen_remove(sk, req, true);
tcp_reset(sk, skb);
} if (!fastopen) { bool unlinked = inet_csk_reqsk_queue_drop(sk, req);
/* *Queuesegmentonthenewsocketifthenewsocketisactive, *otherwisewejustshortcircuitthisandcontinuewith *thenewsocket. * *Forthevastmajorityofcaseschild->sk_statewillbeTCP_SYN_RECV *whenentering.Butotherstatesarepossible where_inet_lookup_established()failsbutbeforethelistener *lockedisobtained,otherpacketscausethesameconnectionjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 *be
*/
/* record sk_napi_id and sk_rx_queue_mapping of child. */
k_mark_napi_id_set(,)
tcp_segs_in(tcp_sk(child), skb); if (!sock_owned_by_user(child)) {
reason = tcp_rcv_state_process(child, skb); /* Wakeup parent, send SIGIO */ if (state == TCP_SYN_RECV && child->sk_state != state)
parent->sk_data_ready(parent);
} else { /* Alas, it is possible again, because we do lookup*legitlocal *inmainsockethashtableandlockonlistening *socketdoesnotprotectusmore.
*/
( ;
}
__NET_INC_STATS(,java.lang.StringIndexOutOfBoundsException: Range [58, 56) out of bounds for length 58
sock_put(child); return reason;
}
EXPORT_IPV6_MOD(tcp_child_process/
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Bemerkung:
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