| 1 | /* |
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| 2 | * Copyright (c) 1982, 1986, 1993, 1994, 1995 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 3. All advertising materials mentioning features or use of this software |
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| 14 | * must display the following acknowledgement: |
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| 15 | * This product includes software developed by the University of |
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| 16 | * California, Berkeley and its contributors. |
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| 17 | * 4. Neither the name of the University nor the names of its contributors |
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| 18 | * may be used to endorse or promote products derived from this software |
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| 19 | * without specific prior written permission. |
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| 20 | * |
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 31 | * SUCH DAMAGE. |
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| 32 | * |
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| 33 | * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 |
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| 34 | * $Id$ |
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| 35 | */ |
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| 36 | |
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| 37 | #ifndef _NETINET_TCP_VAR_H_ |
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| 38 | #define _NETINET_TCP_VAR_H_ |
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| 39 | /* |
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| 40 | * Kernel variables for tcp. |
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| 41 | */ |
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| 42 | |
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| 43 | /* |
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| 44 | * Tcp control block, one per tcp; fields: |
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| 45 | */ |
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| 46 | struct tcpcb { |
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| 47 | struct tcpiphdr *seg_next; /* sequencing queue */ |
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| 48 | struct tcpiphdr *seg_prev; |
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| 49 | int t_state; /* state of this connection */ |
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| 50 | int t_timer[TCPT_NTIMERS]; /* tcp timers */ |
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| 51 | int t_rxtshift; /* log(2) of rexmt exp. backoff */ |
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| 52 | int t_rxtcur; /* current retransmit value */ |
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| 53 | int t_dupacks; /* consecutive dup acks recd */ |
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| 54 | u_int t_maxseg; /* maximum segment size */ |
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| 55 | u_int t_maxopd; /* mss plus options */ |
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| 56 | int t_force; /* 1 if forcing out a byte */ |
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| 57 | u_int t_flags; |
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| 58 | #define TF_ACKNOW 0x0001 /* ack peer immediately */ |
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| 59 | #define TF_DELACK 0x0002 /* ack, but try to delay it */ |
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| 60 | #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ |
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| 61 | #define TF_NOOPT 0x0008 /* don't use tcp options */ |
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| 62 | #define TF_SENTFIN 0x0010 /* have sent FIN */ |
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| 63 | #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ |
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| 64 | #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ |
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| 65 | #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ |
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| 66 | #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ |
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| 67 | #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ |
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| 68 | #define TF_NEEDSYN 0x0400 /* send SYN (implicit state) */ |
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| 69 | #define TF_NEEDFIN 0x0800 /* send FIN (implicit state) */ |
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| 70 | #define TF_NOPUSH 0x1000 /* don't push */ |
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| 71 | #define TF_REQ_CC 0x2000 /* have/will request CC */ |
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| 72 | #define TF_RCVD_CC 0x4000 /* a CC was received in SYN */ |
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| 73 | #define TF_SENDCCNEW 0x8000 /* send CCnew instead of CC in SYN */ |
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| 74 | |
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| 75 | struct tcpiphdr *t_template; /* skeletal packet for transmit */ |
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| 76 | struct inpcb *t_inpcb; /* back pointer to internet pcb */ |
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| 77 | /* |
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| 78 | * The following fields are used as in the protocol specification. |
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| 79 | * See RFC783, Dec. 1981, page 21. |
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| 80 | */ |
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| 81 | /* send sequence variables */ |
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| 82 | tcp_seq snd_una; /* send unacknowledged */ |
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| 83 | tcp_seq snd_nxt; /* send next */ |
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| 84 | tcp_seq snd_up; /* send urgent pointer */ |
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| 85 | tcp_seq snd_wl1; /* window update seg seq number */ |
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| 86 | tcp_seq snd_wl2; /* window update seg ack number */ |
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| 87 | tcp_seq iss; /* initial send sequence number */ |
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| 88 | u_long snd_wnd; /* send window */ |
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| 89 | /* receive sequence variables */ |
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| 90 | u_long rcv_wnd; /* receive window */ |
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| 91 | tcp_seq rcv_nxt; /* receive next */ |
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| 92 | tcp_seq rcv_up; /* receive urgent pointer */ |
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| 93 | tcp_seq irs; /* initial receive sequence number */ |
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| 94 | /* |
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| 95 | * Additional variables for this implementation. |
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| 96 | */ |
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| 97 | /* receive variables */ |
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| 98 | tcp_seq rcv_adv; /* advertised window */ |
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| 99 | /* retransmit variables */ |
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| 100 | tcp_seq snd_max; /* highest sequence number sent; |
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| 101 | * used to recognize retransmits |
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| 102 | */ |
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| 103 | /* congestion control (for slow start, source quench, retransmit after loss) */ |
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| 104 | u_long snd_cwnd; /* congestion-controlled window */ |
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| 105 | u_long snd_ssthresh; /* snd_cwnd size threshold for |
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| 106 | * for slow start exponential to |
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| 107 | * linear switch |
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| 108 | */ |
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| 109 | /* |
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| 110 | * transmit timing stuff. See below for scale of srtt and rttvar. |
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| 111 | * "Variance" is actually smoothed difference. |
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| 112 | */ |
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| 113 | u_int t_idle; /* inactivity time */ |
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| 114 | int t_rtt; /* round trip time */ |
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| 115 | tcp_seq t_rtseq; /* sequence number being timed */ |
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| 116 | int t_srtt; /* smoothed round-trip time */ |
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| 117 | int t_rttvar; /* variance in round-trip time */ |
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| 118 | u_int t_rttmin; /* minimum rtt allowed */ |
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| 119 | u_long max_sndwnd; /* largest window peer has offered */ |
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| 120 | |
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| 121 | /* out-of-band data */ |
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| 122 | char t_oobflags; /* have some */ |
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| 123 | char t_iobc; /* input character */ |
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| 124 | #define TCPOOB_HAVEDATA 0x01 |
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| 125 | #define TCPOOB_HADDATA 0x02 |
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| 126 | int t_softerror; /* possible error not yet reported */ |
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| 127 | |
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| 128 | /* RFC 1323 variables */ |
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| 129 | u_char snd_scale; /* window scaling for send window */ |
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| 130 | u_char rcv_scale; /* window scaling for recv window */ |
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| 131 | u_char request_r_scale; /* pending window scaling */ |
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| 132 | u_char requested_s_scale; |
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| 133 | u_long ts_recent; /* timestamp echo data */ |
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| 134 | u_long ts_recent_age; /* when last updated */ |
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| 135 | tcp_seq last_ack_sent; |
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| 136 | /* RFC 1644 variables */ |
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| 137 | tcp_cc cc_send; /* send connection count */ |
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| 138 | tcp_cc cc_recv; /* receive connection count */ |
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| 139 | u_long t_duration; /* connection duration */ |
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| 140 | |
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| 141 | /* TUBA stuff */ |
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| 142 | caddr_t t_tuba_pcb; /* next level down pcb for TCP over z */ |
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| 143 | /* More RTT stuff */ |
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| 144 | u_long t_rttupdated; /* number of times rtt sampled */ |
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| 145 | }; |
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| 146 | |
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| 147 | /* |
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| 148 | * Structure to hold TCP options that are only used during segment |
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| 149 | * processing (in tcp_input), but not held in the tcpcb. |
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| 150 | * It's basically used to reduce the number of parameters |
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| 151 | * to tcp_dooptions. |
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| 152 | */ |
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| 153 | struct tcpopt { |
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| 154 | u_long to_flag; /* which options are present */ |
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| 155 | #define TOF_TS 0x0001 /* timestamp */ |
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| 156 | #define TOF_CC 0x0002 /* CC and CCnew are exclusive */ |
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| 157 | #define TOF_CCNEW 0x0004 |
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| 158 | #define TOF_CCECHO 0x0008 |
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| 159 | u_long to_tsval; |
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| 160 | u_long to_tsecr; |
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| 161 | tcp_cc to_cc; /* holds CC or CCnew */ |
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| 162 | tcp_cc to_ccecho; |
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| 163 | }; |
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| 164 | |
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| 165 | /* |
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| 166 | * The TAO cache entry which is stored in the protocol family specific |
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| 167 | * portion of the route metrics. |
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| 168 | */ |
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| 169 | struct rmxp_tao { |
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| 170 | tcp_cc tao_cc; /* latest CC in valid SYN */ |
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| 171 | tcp_cc tao_ccsent; /* latest CC sent to peer */ |
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| 172 | u_short tao_mssopt; /* peer's cached MSS */ |
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| 173 | #ifdef notyet |
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| 174 | u_short tao_flags; /* cache status flags */ |
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| 175 | #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ |
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| 176 | #define TAOF_OK 0x0002 /* peer does understand rfc1644 */ |
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| 177 | #define TAOF_UNDEF 0 /* we don't know yet */ |
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| 178 | #endif /* notyet */ |
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| 179 | }; |
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| 180 | #define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) |
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| 181 | |
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| 182 | #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) |
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| 183 | #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) |
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| 184 | |
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| 185 | /* |
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| 186 | * The smoothed round-trip time and estimated variance |
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| 187 | * are stored as fixed point numbers scaled by the values below. |
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| 188 | * For convenience, these scales are also used in smoothing the average |
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| 189 | * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). |
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| 190 | * With these scales, srtt has 3 bits to the right of the binary point, |
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| 191 | * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the |
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| 192 | * binary point, and is smoothed with an ALPHA of 0.75. |
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| 193 | */ |
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| 194 | #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ |
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| 195 | #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ |
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| 196 | #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ |
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| 197 | #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ |
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| 198 | #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ |
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| 199 | |
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| 200 | /* |
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| 201 | * The initial retransmission should happen at rtt + 4 * rttvar. |
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| 202 | * Because of the way we do the smoothing, srtt and rttvar |
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| 203 | * will each average +1/2 tick of bias. When we compute |
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| 204 | * the retransmit timer, we want 1/2 tick of rounding and |
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| 205 | * 1 extra tick because of +-1/2 tick uncertainty in the |
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| 206 | * firing of the timer. The bias will give us exactly the |
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| 207 | * 1.5 tick we need. But, because the bias is |
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| 208 | * statistical, we have to test that we don't drop below |
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| 209 | * the minimum feasible timer (which is 2 ticks). |
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| 210 | * This version of the macro adapted from a paper by Lawrence |
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| 211 | * Brakmo and Larry Peterson which outlines a problem caused |
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| 212 | * by insufficient precision in the original implementation, |
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| 213 | * which results in inappropriately large RTO values for very |
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| 214 | * fast networks. |
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| 215 | */ |
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| 216 | #define TCP_REXMTVAL(tp) \ |
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| 217 | ((((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ |
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| 218 | + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) |
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| 219 | |
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| 220 | /* XXX |
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| 221 | * We want to avoid doing m_pullup on incoming packets but that |
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| 222 | * means avoiding dtom on the tcp reassembly code. That in turn means |
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| 223 | * keeping an mbuf pointer in the reassembly queue (since we might |
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| 224 | * have a cluster). As a quick hack, the source & destination |
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| 225 | * port numbers (which are no longer needed once we've located the |
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| 226 | * tcpcb) are overlayed with an mbuf pointer. |
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| 227 | */ |
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| 228 | #if (defined(__GNUC__) && (defined(__arm__) || defined(__mips__))) |
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| 229 | #define STR32_UNALGN(ti,m) \ |
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| 230 | (ti)->ti_sport = (unsigned short)(((unsigned int) m & 0xffff0000) >> 16); \ |
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| 231 | (ti)->ti_dport = (unsigned short) ((unsigned int) m & 0x0000ffff); |
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| 232 | #define LD32_UNALGN(ti,m) \ |
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| 233 | m = (struct mbuf *)((((unsigned int) (ti)->ti_sport) << 16) | ( (unsigned int)(ti)->ti_dport)); |
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| 234 | |
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| 235 | #else |
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| 236 | #define REASS_MBUF(ti) (*(struct mbuf **)&((ti)->ti_t)) |
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| 237 | #endif |
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| 238 | |
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| 239 | /* |
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| 240 | * TCP statistics. |
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| 241 | * Many of these should be kept per connection, |
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| 242 | * but that's inconvenient at the moment. |
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| 243 | */ |
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| 244 | struct tcpstat { |
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| 245 | u_long tcps_connattempt; /* connections initiated */ |
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| 246 | u_long tcps_accepts; /* connections accepted */ |
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| 247 | u_long tcps_connects; /* connections established */ |
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| 248 | u_long tcps_drops; /* connections dropped */ |
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| 249 | u_long tcps_conndrops; /* embryonic connections dropped */ |
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| 250 | u_long tcps_closed; /* conn. closed (includes drops) */ |
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| 251 | u_long tcps_segstimed; /* segs where we tried to get rtt */ |
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| 252 | u_long tcps_rttupdated; /* times we succeeded */ |
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| 253 | u_long tcps_delack; /* delayed acks sent */ |
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| 254 | u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ |
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| 255 | u_long tcps_rexmttimeo; /* retransmit timeouts */ |
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| 256 | u_long tcps_persisttimeo; /* persist timeouts */ |
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| 257 | u_long tcps_keeptimeo; /* keepalive timeouts */ |
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| 258 | u_long tcps_keepprobe; /* keepalive probes sent */ |
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| 259 | u_long tcps_keepdrops; /* connections dropped in keepalive */ |
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| 260 | |
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| 261 | u_long tcps_sndtotal; /* total packets sent */ |
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| 262 | u_long tcps_sndpack; /* data packets sent */ |
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| 263 | u_long tcps_sndbyte; /* data bytes sent */ |
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| 264 | u_long tcps_sndrexmitpack; /* data packets retransmitted */ |
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| 265 | u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ |
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| 266 | u_long tcps_sndacks; /* ack-only packets sent */ |
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| 267 | u_long tcps_sndprobe; /* window probes sent */ |
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| 268 | u_long tcps_sndurg; /* packets sent with URG only */ |
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| 269 | u_long tcps_sndwinup; /* window update-only packets sent */ |
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| 270 | u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ |
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| 271 | |
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| 272 | u_long tcps_rcvtotal; /* total packets received */ |
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| 273 | u_long tcps_rcvpack; /* packets received in sequence */ |
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| 274 | u_long tcps_rcvbyte; /* bytes received in sequence */ |
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| 275 | u_long tcps_rcvbadsum; /* packets received with ccksum errs */ |
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| 276 | u_long tcps_rcvbadoff; /* packets received with bad offset */ |
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| 277 | u_long tcps_rcvshort; /* packets received too short */ |
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| 278 | u_long tcps_rcvduppack; /* duplicate-only packets received */ |
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| 279 | u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ |
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| 280 | u_long tcps_rcvpartduppack; /* packets with some duplicate data */ |
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| 281 | u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ |
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| 282 | u_long tcps_rcvoopack; /* out-of-order packets received */ |
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| 283 | u_long tcps_rcvoobyte; /* out-of-order bytes received */ |
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| 284 | u_long tcps_rcvpackafterwin; /* packets with data after window */ |
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| 285 | u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ |
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| 286 | u_long tcps_rcvafterclose; /* packets rcvd after "close" */ |
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| 287 | u_long tcps_rcvwinprobe; /* rcvd window probe packets */ |
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| 288 | u_long tcps_rcvdupack; /* rcvd duplicate acks */ |
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| 289 | u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ |
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| 290 | u_long tcps_rcvackpack; /* rcvd ack packets */ |
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| 291 | u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ |
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| 292 | u_long tcps_rcvwinupd; /* rcvd window update packets */ |
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| 293 | u_long tcps_pawsdrop; /* segments dropped due to PAWS */ |
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| 294 | u_long tcps_predack; /* times hdr predict ok for acks */ |
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| 295 | u_long tcps_preddat; /* times hdr predict ok for data pkts */ |
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| 296 | u_long tcps_pcbcachemiss; |
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| 297 | u_long tcps_cachedrtt; /* times cached RTT in route updated */ |
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| 298 | u_long tcps_cachedrttvar; /* times cached rttvar updated */ |
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| 299 | u_long tcps_cachedssthresh; /* times cached ssthresh updated */ |
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| 300 | u_long tcps_usedrtt; /* times RTT initialized from route */ |
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| 301 | u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ |
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| 302 | u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ |
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| 303 | u_long tcps_persistdrop; /* timeout in persist state */ |
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| 304 | u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ |
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| 305 | u_long tcps_mturesent; /* resends due to MTU discovery */ |
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| 306 | u_long tcps_listendrop; /* listen queue overflows */ |
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| 307 | }; |
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| 308 | |
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| 309 | /* |
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| 310 | * TCB structure exported to user-land via sysctl(3). |
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| 311 | * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been |
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| 312 | * included. Not all of our clients do. |
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| 313 | */ |
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| 314 | #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) |
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| 315 | struct xtcpcb { |
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| 316 | size_t xt_len; |
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| 317 | struct inpcb xt_inp; |
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| 318 | struct tcpcb xt_tp; |
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| 319 | #if 0 |
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| 320 | struct xsocket xt_socket; |
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| 321 | u_quad_t xt_alignment_hack; |
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| 322 | #endif |
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| 323 | }; |
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| 324 | #endif |
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| 325 | |
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| 326 | /* |
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| 327 | * Names for TCP sysctl objects |
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| 328 | */ |
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| 329 | #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ |
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| 330 | #define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ |
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| 331 | #define TCPCTL_MSSDFLT 3 /* MSS default */ |
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| 332 | #define TCPCTL_STATS 4 /* statistics (read-only) */ |
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| 333 | #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ |
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| 334 | #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ |
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| 335 | #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ |
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| 336 | #define TCPCTL_SENDSPACE 8 /* send buffer space */ |
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| 337 | #define TCPCTL_RECVSPACE 9 /* receive buffer space */ |
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| 338 | #define TCPCTL_KEEPINIT 10 /* receive buffer space */ |
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| 339 | #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ |
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| 340 | #define TCPCTL_MAXID 12 |
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| 341 | |
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| 342 | #define TCPCTL_NAMES { \ |
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| 343 | { 0, 0 }, \ |
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| 344 | { "rfc1323", CTLTYPE_INT }, \ |
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| 345 | { "rfc1644", CTLTYPE_INT }, \ |
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| 346 | { "mssdflt", CTLTYPE_INT }, \ |
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| 347 | { "stats", CTLTYPE_STRUCT }, \ |
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| 348 | { "rttdflt", CTLTYPE_INT }, \ |
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| 349 | { "keepidle", CTLTYPE_INT }, \ |
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| 350 | { "keepintvl", CTLTYPE_INT }, \ |
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| 351 | { "sendspace", CTLTYPE_INT }, \ |
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| 352 | { "recvspace", CTLTYPE_INT }, \ |
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| 353 | { "keepinit", CTLTYPE_INT }, \ |
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| 354 | } |
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| 355 | |
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| 356 | #ifdef _KERNEL |
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| 357 | #ifdef SYSCTL_DECL |
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| 358 | SYSCTL_DECL(_net_inet_tcp); |
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| 359 | #endif |
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| 360 | |
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| 361 | extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ |
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| 362 | extern struct inpcbinfo tcbinfo; |
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| 363 | extern struct tcpstat tcpstat; /* tcp statistics */ |
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| 364 | extern int tcp_mssdflt; /* XXX */ |
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| 365 | extern u_long tcp_now; /* for RFC 1323 timestamps */ |
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| 366 | |
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| 367 | void tcp_canceltimers __P((struct tcpcb *)); |
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| 368 | struct tcpcb * |
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| 369 | tcp_close __P((struct tcpcb *)); |
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| 370 | void tcp_ctlinput __P((int, struct sockaddr *, void *)); |
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| 371 | int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); |
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| 372 | struct tcpcb * |
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| 373 | tcp_drop __P((struct tcpcb *, int)); |
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| 374 | void tcp_drain __P((void)); |
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| 375 | void tcp_fasttimo __P((void)); |
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| 376 | struct rmxp_tao * |
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| 377 | tcp_gettaocache __P((struct inpcb *)); |
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| 378 | void tcp_init __P((void)); |
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| 379 | void tcp_input __P((struct mbuf *, int)); |
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| 380 | void tcp_mss __P((struct tcpcb *, int)); |
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| 381 | int tcp_mssopt __P((struct tcpcb *)); |
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| 382 | void tcp_mtudisc __P((struct inpcb *, int)); |
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| 383 | struct tcpcb * |
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| 384 | tcp_newtcpcb __P((struct inpcb *)); |
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| 385 | int tcp_output __P((struct tcpcb *)); |
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| 386 | void tcp_quench __P((struct inpcb *, int)); |
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| 387 | void tcp_respond __P((struct tcpcb *, |
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| 388 | struct tcpiphdr *, struct mbuf *, u_long, u_long, int)); |
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| 389 | struct rtentry * |
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| 390 | tcp_rtlookup __P((struct inpcb *)); |
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| 391 | void tcp_setpersist __P((struct tcpcb *)); |
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| 392 | void tcp_slowtimo __P((void)); |
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| 393 | struct tcpiphdr * |
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| 394 | tcp_template __P((struct tcpcb *)); |
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| 395 | struct tcpcb * |
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| 396 | tcp_timers __P((struct tcpcb *, int)); |
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| 397 | void tcp_trace __P((int, int, struct tcpcb *, struct tcpiphdr *, int)); |
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| 398 | |
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| 399 | extern struct pr_usrreqs tcp_usrreqs; |
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| 400 | extern u_long tcp_sendspace; |
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| 401 | extern u_long tcp_recvspace; |
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| 402 | |
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| 403 | #endif /* _KERNEL */ |
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| 404 | |
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| 405 | #endif /* _NETINET_TCP_VAR_H_ */ |
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