1df8bae1dSRodney W. Grimes /* 2df8bae1dSRodney W. Grimes * Copyright (c) 1982, 1986, 1993 3df8bae1dSRodney W. Grimes * The Regents of the University of California. All rights reserved. 4df8bae1dSRodney W. Grimes * 5df8bae1dSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 6df8bae1dSRodney W. Grimes * modification, are permitted provided that the following conditions 7df8bae1dSRodney W. Grimes * are met: 8df8bae1dSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 9df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 10df8bae1dSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 11df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 12df8bae1dSRodney W. Grimes * documentation and/or other materials provided with the distribution. 13df8bae1dSRodney W. Grimes * 3. All advertising materials mentioning features or use of this software 14df8bae1dSRodney W. Grimes * must display the following acknowledgement: 15df8bae1dSRodney W. Grimes * This product includes software developed by the University of 16df8bae1dSRodney W. Grimes * California, Berkeley and its contributors. 17df8bae1dSRodney W. Grimes * 4. Neither the name of the University nor the names of its contributors 18df8bae1dSRodney W. Grimes * may be used to endorse or promote products derived from this software 19df8bae1dSRodney W. Grimes * without specific prior written permission. 20df8bae1dSRodney W. Grimes * 21df8bae1dSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22df8bae1dSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23df8bae1dSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24df8bae1dSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25df8bae1dSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26df8bae1dSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27df8bae1dSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28df8bae1dSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29df8bae1dSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30df8bae1dSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31df8bae1dSRodney W. Grimes * SUCH DAMAGE. 32df8bae1dSRodney W. Grimes * 33df8bae1dSRodney W. Grimes * @(#)tcp.h 8.1 (Berkeley) 6/10/93 34c3aac50fSPeter Wemm * $FreeBSD$ 35df8bae1dSRodney W. Grimes */ 36df8bae1dSRodney W. Grimes 37707f139eSPaul Richards #ifndef _NETINET_TCP_H_ 38707f139eSPaul Richards #define _NETINET_TCP_H_ 39707f139eSPaul Richards 4007a4df4fSBruce Evans typedef u_int32_t tcp_seq; 4107a4df4fSBruce Evans typedef u_int32_t tcp_cc; /* connection count per rfc1644 */ 42eb6ad696SGarrett Wollman 43fb59c426SYoshinobu Inoue #define tcp6_seq tcp_seq /* for KAME src sync over BSD*'s */ 44fb59c426SYoshinobu Inoue #define tcp6hdr tcphdr /* for KAME src sync over BSD*'s */ 45fb59c426SYoshinobu Inoue 46df8bae1dSRodney W. Grimes /* 47df8bae1dSRodney W. Grimes * TCP header. 48df8bae1dSRodney W. Grimes * Per RFC 793, September, 1981. 49df8bae1dSRodney W. Grimes */ 50df8bae1dSRodney W. Grimes struct tcphdr { 51df8bae1dSRodney W. Grimes u_short th_sport; /* source port */ 52df8bae1dSRodney W. Grimes u_short th_dport; /* destination port */ 53df8bae1dSRodney W. Grimes tcp_seq th_seq; /* sequence number */ 54df8bae1dSRodney W. Grimes tcp_seq th_ack; /* acknowledgement number */ 55df8bae1dSRodney W. Grimes #if BYTE_ORDER == LITTLE_ENDIAN 56a09bee1aSBruce Evans u_int th_x2:4, /* (unused) */ 57df8bae1dSRodney W. Grimes th_off:4; /* data offset */ 58df8bae1dSRodney W. Grimes #endif 59df8bae1dSRodney W. Grimes #if BYTE_ORDER == BIG_ENDIAN 60a09bee1aSBruce Evans u_int th_off:4, /* data offset */ 61df8bae1dSRodney W. Grimes th_x2:4; /* (unused) */ 62df8bae1dSRodney W. Grimes #endif 63df8bae1dSRodney W. Grimes u_char th_flags; 64df8bae1dSRodney W. Grimes #define TH_FIN 0x01 65df8bae1dSRodney W. Grimes #define TH_SYN 0x02 66df8bae1dSRodney W. Grimes #define TH_RST 0x04 67df8bae1dSRodney W. Grimes #define TH_PUSH 0x08 68df8bae1dSRodney W. Grimes #define TH_ACK 0x10 69df8bae1dSRodney W. Grimes #define TH_URG 0x20 7065450f2fSRobert Watson #define TH_ECE 0x40 7165450f2fSRobert Watson #define TH_CWR 0x80 7265450f2fSRobert Watson #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR) 732f96f1f4SGarrett Wollman 74df8bae1dSRodney W. Grimes u_short th_win; /* window */ 75df8bae1dSRodney W. Grimes u_short th_sum; /* checksum */ 76df8bae1dSRodney W. Grimes u_short th_urp; /* urgent pointer */ 77df8bae1dSRodney W. Grimes }; 78df8bae1dSRodney W. Grimes 79df8bae1dSRodney W. Grimes #define TCPOPT_EOL 0 80df8bae1dSRodney W. Grimes #define TCPOPT_NOP 1 81df8bae1dSRodney W. Grimes #define TCPOPT_MAXSEG 2 82df8bae1dSRodney W. Grimes #define TCPOLEN_MAXSEG 4 83df8bae1dSRodney W. Grimes #define TCPOPT_WINDOW 3 84df8bae1dSRodney W. Grimes #define TCPOLEN_WINDOW 3 85df8bae1dSRodney W. Grimes #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ 86df8bae1dSRodney W. Grimes #define TCPOLEN_SACK_PERMITTED 2 87df8bae1dSRodney W. Grimes #define TCPOPT_SACK 5 /* Experimental */ 88df8bae1dSRodney W. Grimes #define TCPOPT_TIMESTAMP 8 89df8bae1dSRodney W. Grimes #define TCPOLEN_TIMESTAMP 10 90df8bae1dSRodney W. Grimes #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 91df8bae1dSRodney W. Grimes #define TCPOPT_TSTAMP_HDR \ 92df8bae1dSRodney W. Grimes (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 93df8bae1dSRodney W. Grimes 94eb6ad696SGarrett Wollman #define TCPOPT_CC 11 /* CC options: RFC-1644 */ 95eb6ad696SGarrett Wollman #define TCPOPT_CCNEW 12 96eb6ad696SGarrett Wollman #define TCPOPT_CCECHO 13 97eb6ad696SGarrett Wollman #define TCPOLEN_CC 6 98eb6ad696SGarrett Wollman #define TCPOLEN_CC_APPA (TCPOLEN_CC+2) 99eb6ad696SGarrett Wollman #define TCPOPT_CC_HDR(ccopt) \ 100eb6ad696SGarrett Wollman (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC) 101eb6ad696SGarrett Wollman 102df8bae1dSRodney W. Grimes /* 103df8bae1dSRodney W. Grimes * Default maximum segment size for TCP. 104df8bae1dSRodney W. Grimes * With an IP MSS of 576, this is 536, 105df8bae1dSRodney W. Grimes * but 512 is probably more convenient. 106df8bae1dSRodney W. Grimes * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). 107df8bae1dSRodney W. Grimes */ 108df8bae1dSRodney W. Grimes #define TCP_MSS 512 109df8bae1dSRodney W. Grimes 11076429de4SYoshinobu Inoue /* 11176429de4SYoshinobu Inoue * Default maximum segment size for TCP6. 11276429de4SYoshinobu Inoue * With an IP6 MSS of 1280, this is 1220, 11376429de4SYoshinobu Inoue * but 1024 is probably more convenient. (xxx kazu in doubt) 11476429de4SYoshinobu Inoue * This should be defined as MIN(1024, IP6_MSS - sizeof (struct tcpip6hdr)) 11576429de4SYoshinobu Inoue */ 11676429de4SYoshinobu Inoue #define TCP6_MSS 1024 11776429de4SYoshinobu Inoue 118df8bae1dSRodney W. Grimes #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ 119eb6ad696SGarrett Wollman #define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */ 120df8bae1dSRodney W. Grimes 121df8bae1dSRodney W. Grimes #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ 122df8bae1dSRodney W. Grimes 12346f58482SJonathan Lemon #define TCP_MAXBURST 4 /* maximum segments in a burst */ 12446f58482SJonathan Lemon 125eb6ad696SGarrett Wollman #define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */ 126eb6ad696SGarrett Wollman #define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr)) 127eb6ad696SGarrett Wollman /* max space left for options */ 128eb6ad696SGarrett Wollman 129df8bae1dSRodney W. Grimes /* 130df8bae1dSRodney W. Grimes * User-settable options (used with setsockopt). 131df8bae1dSRodney W. Grimes */ 132df8bae1dSRodney W. Grimes #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ 133df8bae1dSRodney W. Grimes #define TCP_MAXSEG 0x02 /* set maximum segment size */ 134eb6ad696SGarrett Wollman #define TCP_NOPUSH 0x04 /* don't push last block of write */ 135eb6ad696SGarrett Wollman #define TCP_NOOPT 0x08 /* don't use TCP options */ 136707f139eSPaul Richards 137707f139eSPaul Richards #endif 138