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head/sys/netinet/tcp_output.c
| Show First 20 Lines • Show All 1,164 Lines • ▼ Show 20 Lines | if (tp->t_state == TCPS_ESTABLISHED && | ||||
| (tp->t_flags2 & TF2_ECN_PERMIT)) { | (tp->t_flags2 & TF2_ECN_PERMIT)) { | ||||
| /* | /* | ||||
| * 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. | ||||
| */ | */ | ||||
| if (len > 0 && SEQ_GEQ(tp->snd_nxt, tp->snd_max) && | if (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))) { | |||||
| #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. | |||||
| */ | */ | ||||
| if (tp->t_flags2 & TF2_ECN_SND_CWR) { | if (tp->t_flags2 & TF2_ECN_SND_CWR) { | ||||
| 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; | ||||
| } | } | ||||
| /* | /* | ||||
| * If we are doing retransmissions, then snd_nxt will | * If we are doing retransmissions, then snd_nxt will | ||||
| * not reflect the first unsent octet. For ACK only | * not reflect the first unsent octet. For ACK only | ||||
| ▲ Show 20 Lines • Show All 918 Lines • Show Last 20 Lines | |||||