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head/sys/netinet/tcp_subr.c
| Show First 20 Lines • Show All 3,007 Lines • ▼ Show 20 Lines | tcp_maxseg(const struct tcpcb *tp) | ||||
| /* | /* | ||||
| * Here we have a simplified code from tcp_addoptions(), | * Here we have a simplified code from tcp_addoptions(), | ||||
| * without a proper loop, and having most of paddings hardcoded. | * without a proper loop, and having most of paddings hardcoded. | ||||
| * We might make mistakes with padding here in some edge cases, | * We might make mistakes with padding here in some edge cases, | ||||
| * but this is harmless, since result of tcp_maxseg() is used | * but this is harmless, since result of tcp_maxseg() is used | ||||
| * only in cwnd and ssthresh estimations. | * only in cwnd and ssthresh estimations. | ||||
| */ | */ | ||||
| #define PAD(len) ((((len) / 4) + !!((len) % 4)) * 4) | |||||
| if (TCPS_HAVEESTABLISHED(tp->t_state)) { | if (TCPS_HAVEESTABLISHED(tp->t_state)) { | ||||
| if (tp->t_flags & TF_RCVD_TSTMP) | if (tp->t_flags & TF_RCVD_TSTMP) | ||||
| optlen = TCPOLEN_TSTAMP_APPA; | optlen = TCPOLEN_TSTAMP_APPA; | ||||
| else | else | ||||
| optlen = 0; | optlen = 0; | ||||
| #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) | #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) | ||||
| if (tp->t_flags & TF_SIGNATURE) | if (tp->t_flags & TF_SIGNATURE) | ||||
| optlen += PAD(TCPOLEN_SIGNATURE); | optlen += PADTCPOLEN(TCPOLEN_SIGNATURE); | ||||
| #endif | #endif | ||||
| if ((tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0) { | if ((tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0) { | ||||
| optlen += TCPOLEN_SACKHDR; | optlen += TCPOLEN_SACKHDR; | ||||
| optlen += tp->rcv_numsacks * TCPOLEN_SACK; | optlen += tp->rcv_numsacks * TCPOLEN_SACK; | ||||
| optlen = PAD(optlen); | optlen = PADTCPOLEN(optlen); | ||||
| } | } | ||||
| } else { | } else { | ||||
| if (tp->t_flags & TF_REQ_TSTMP) | if (tp->t_flags & TF_REQ_TSTMP) | ||||
| optlen = TCPOLEN_TSTAMP_APPA; | optlen = TCPOLEN_TSTAMP_APPA; | ||||
| else | else | ||||
| optlen = PAD(TCPOLEN_MAXSEG); | optlen = PADTCPOLEN(TCPOLEN_MAXSEG); | ||||
| if (tp->t_flags & TF_REQ_SCALE) | if (tp->t_flags & TF_REQ_SCALE) | ||||
| optlen += PAD(TCPOLEN_WINDOW); | optlen += PADTCPOLEN(TCPOLEN_WINDOW); | ||||
| #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) | #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) | ||||
| if (tp->t_flags & TF_SIGNATURE) | if (tp->t_flags & TF_SIGNATURE) | ||||
| optlen += PAD(TCPOLEN_SIGNATURE); | optlen += PADTCPOLEN(TCPOLEN_SIGNATURE); | ||||
| #endif | #endif | ||||
| if (tp->t_flags & TF_SACK_PERMIT) | if (tp->t_flags & TF_SACK_PERMIT) | ||||
| optlen += PAD(TCPOLEN_SACK_PERMITTED); | optlen += PADTCPOLEN(TCPOLEN_SACK_PERMITTED); | ||||
| } | } | ||||
| #undef PAD | #undef PAD | ||||
| optlen = min(optlen, TCP_MAXOLEN); | optlen = min(optlen, TCP_MAXOLEN); | ||||
| return (tp->t_maxseg - optlen); | return (tp->t_maxseg - optlen); | ||||
| } | } | ||||
| static int | static int | ||||
| sysctl_drop(SYSCTL_HANDLER_ARGS) | sysctl_drop(SYSCTL_HANDLER_ARGS) | ||||
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