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Differential D23230 Diff 83546 sys/netinet/tcp_output.c

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sys/netinet/tcp_output.c

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} }
/* Handle parallel SYN for ECN */ /* Handle parallel SYN for ECN */
if ((tp->t_state == TCPS_SYN_RECEIVED) && if ((tp->t_state == TCPS_SYN_RECEIVED) &&
(tp->t_flags2 & TF2_ECN_SND_ECE)) { (tp->t_flags2 & TF2_ECN_SND_ECE)) {
flags |= TH_ECE; flags |= TH_ECE;
tp->t_flags2 &= ~TF2_ECN_SND_ECE; tp->t_flags2 &= ~TF2_ECN_SND_ECE;
} }
if (tp->t_state == TCPS_ESTABLISHED && if (((tp->t_state == TCPS_ESTABLISHED) &&
(tp->t_flags2 & TF2_ECN_PERMIT)) { (tp->t_flags2 & TF2_ECN_PERMIT)) ||
((tp->t_state > TCPS_ESTABLISHED) &&
(tp->t_flags2 & TF2_ECN_PERMIT) &&
V_tcp_ecn_generalized) ||
/* /*
* Note that a passive open SYN,ACK
* is actually sent from tcp_syncache
*/
(((flags & (TH_SYN|TH_ACK)) == (TH_SYN)) &&
((flags & (TH_ECE|TH_CWR)) == (TH_ECE|TH_CWR)) &&
V_tcp_ecn_generalized) ||
(((flags & (TH_SYN|TH_ACK)) == (TH_SYN|TH_ACK)) &&
(flags & (TH_CWR|TH_ECE)) &&
V_tcp_ecn_generalized)) {
/*
* If the peer has ECN, mark data packets with * If the peer has ECN, mark data packets with
* ECN capable transmission (ECT). * ECN capable transmission (ECT).
* Ignore pure ack packets, retransmissions and window probes. * Ignore pure ack packets, retransmissions and
* window probes unless doing generalized ECN.
*/ */
if (len > 0 && SEQ_GEQ(tp->snd_nxt, tp->snd_max) && if (V_tcp_ecn_generalized ||
((len > 0 && SEQ_GEQ(tp->snd_nxt, tp->snd_max) &&
(sack_rxmit == 0) && (sack_rxmit == 0) &&
!((tp->t_flags & TF_FORCEDATA) && len == 1 && !((tp->t_flags & TF_FORCEDATA) && len == 1 &&
SEQ_LT(tp->snd_una, tp->snd_max))) { SEQ_LT(tp->snd_una, tp->snd_max))))) {
#ifdef INET6 #ifdef INET6
if (isipv6) if (isipv6)
ip6->ip6_flow |= htonl(IPTOS_ECN_ECT0 << 20); ip6->ip6_flow |= htonl(IPTOS_ECN_ECT0 << 20);
else else
#endif #endif
ip->ip_tos |= IPTOS_ECN_ECT0; ip->ip_tos |= IPTOS_ECN_ECT0;
TCPSTAT_INC(tcps_ecn_ect0); TCPSTAT_INC(tcps_ecn_ect0);
/* /*
* Reply with proper ECN notifications. * Reply with proper ECN notifications.
* Only set CWR on new data segments. * Only set CWR on new data segments.
*/ */
if (tp->t_flags2 & TF2_ECN_SND_CWR) { if ((tp->t_flags2 & TF2_ECN_SND_CWR) &&
(len > 0 && SEQ_GEQ(tp->snd_nxt, tp->snd_max) &&
(sack_rxmit == 0))) {
flags |= TH_CWR; flags |= TH_CWR;
tp->t_flags2 &= ~TF2_ECN_SND_CWR; tp->t_flags2 &= ~TF2_ECN_SND_CWR;
} }
} }
if (tp->t_flags2 & TF2_ECN_SND_ECE) if (tp->t_flags2 & TF2_ECN_SND_ECE)
flags |= TH_ECE; flags |= TH_ECE;
} }
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