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sys/netinet/tcp_output.c
| Show First 20 Lines • Show All 197 Lines • ▼ Show 20 Lines | tcp_output(struct tcpcb *tp) | ||||
| struct ip *ip = NULL; | struct ip *ip = NULL; | ||||
| struct ipovly *ipov = NULL; | struct ipovly *ipov = NULL; | ||||
| struct tcphdr *th; | struct tcphdr *th; | ||||
| u_char opt[TCP_MAXOLEN]; | u_char opt[TCP_MAXOLEN]; | ||||
| unsigned ipoptlen, optlen, hdrlen; | unsigned ipoptlen, optlen, hdrlen; | ||||
| #ifdef IPSEC | #ifdef IPSEC | ||||
| unsigned ipsec_optlen = 0; | unsigned ipsec_optlen = 0; | ||||
| #endif | #endif | ||||
| int idle, sendalot; | int idle, sendalot, curticks; | ||||
| int sack_rxmit, sack_bytes_rxmt; | int sack_rxmit, sack_bytes_rxmt; | ||||
| struct sackhole *p; | struct sackhole *p; | ||||
| int tso, mtu; | int tso, mtu; | ||||
| struct tcpopt to; | struct tcpopt to; | ||||
| #if 0 | #if 0 | ||||
| int maxburst = TCP_MAXBURST; | int maxburst = TCP_MAXBURST; | ||||
| #endif | #endif | ||||
| #ifdef INET6 | #ifdef INET6 | ||||
| ▲ Show 20 Lines • Show All 583 Lines • ▼ Show 20 Lines | #endif | ||||
| /* Window scaling. */ | /* Window scaling. */ | ||||
| if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) { | if ((flags & TH_SYN) && (tp->t_flags & TF_REQ_SCALE)) { | ||||
| to.to_wscale = tp->request_r_scale; | to.to_wscale = tp->request_r_scale; | ||||
| to.to_flags |= TOF_SCALE; | to.to_flags |= TOF_SCALE; | ||||
| } | } | ||||
| /* Timestamps. */ | /* Timestamps. */ | ||||
| if ((tp->t_flags & TF_RCVD_TSTMP) || | if ((tp->t_flags & TF_RCVD_TSTMP) || | ||||
| ((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) { | ((flags & TH_SYN) && (tp->t_flags & TF_REQ_TSTMP))) { | ||||
| to.to_tsval = tcp_ts_getticks() + tp->ts_offset; | curticks = tcp_ts_getticks(); | ||||
| to.to_tsval = curticks + tp->ts_offset; | |||||
| to.to_tsecr = tp->ts_recent; | to.to_tsecr = tp->ts_recent; | ||||
| to.to_flags |= TOF_TS; | to.to_flags |= TOF_TS; | ||||
| if (tp->t_rxtshift == 1) | |||||
| tp->t_badrxtwin = curticks; | |||||
| /* Set receive buffer autosizing timestamp. */ | /* Set receive buffer autosizing timestamp. */ | ||||
| if (tp->rfbuf_ts == 0 && | if (tp->rfbuf_ts == 0 && | ||||
| (so->so_rcv.sb_flags & SB_AUTOSIZE)) | (so->so_rcv.sb_flags & SB_AUTOSIZE)) | ||||
| tp->rfbuf_ts = tcp_ts_getticks(); | tp->rfbuf_ts = curticks; | ||||
| } | } | ||||
| /* Selective ACK's. */ | /* Selective ACK's. */ | ||||
| if (tp->t_flags & TF_SACK_PERMIT) { | if (tp->t_flags & TF_SACK_PERMIT) { | ||||
| if (flags & TH_SYN) | if (flags & TH_SYN) | ||||
| to.to_flags |= TOF_SACKPERM; | to.to_flags |= TOF_SACKPERM; | ||||
| else if (TCPS_HAVEESTABLISHED(tp->t_state) && | else if (TCPS_HAVEESTABLISHED(tp->t_state) && | ||||
| (tp->t_flags & TF_SACK_PERMIT) && | (tp->t_flags & TF_SACK_PERMIT) && | ||||
| tp->rcv_numsacks > 0) { | tp->rcv_numsacks > 0) { | ||||
| ▲ Show 20 Lines • Show All 991 Lines • Show Last 20 Lines | |||||