--- /dev/null
+/*-
+ * Copyright (c) 1982, 1986, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)tcp.h 8.1 (Berkeley) 6/10/93
+ * $FreeBSD: src/sys/netinet/tcp.h,v 1.40.2.2 2008/07/31 06:10:25 kmacy Exp $
+ */
+
+#ifndef _NETINET_TCP_H_
+#define _NETINET_TCP_H_
+
+#include <sys/cdefs.h>
+
+#define __BSD_VISIBLE 1
+
+#if __BSD_VISIBLE
+
+typedef u_int32_t tcp_seq;
+
+#define tcp6_seq tcp_seq /* for KAME src sync over BSD*'s */
+#define tcp6hdr tcphdr /* for KAME src sync over BSD*'s */
+
+/*
+ * TCP header.
+ * Per RFC 793, September, 1981.
+ */
+struct tcphdr {
+ u_short th_sport; /* source port */
+ u_short th_dport; /* destination port */
+ tcp_seq th_seq; /* sequence number */
+ tcp_seq th_ack; /* acknowledgement number */
+#if BYTE_ORDER == LITTLE_ENDIAN
+ u_int th_x2:4, /* (unused) */
+ th_off:4; /* data offset */
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+ u_int th_off:4, /* data offset */
+ th_x2:4; /* (unused) */
+#endif
+ u_char th_flags;
+#define TH_FIN 0x01
+#define TH_SYN 0x02
+#define TH_RST 0x04
+#define TH_PUSH 0x08
+#define TH_ACK 0x10
+#define TH_URG 0x20
+#define TH_ECE 0x40
+#define TH_CWR 0x80
+#define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG|TH_ECE|TH_CWR)
+#define PRINT_TH_FLAGS "\20\1FIN\2SYN\3RST\4PUSH\5ACK\6URG\7ECE\10CWR"
+
+ u_short th_win; /* window */
+ u_short th_sum; /* checksum */
+ u_short th_urp; /* urgent pointer */
+};
+
+#define TCPOPT_EOL 0
+#define TCPOLEN_EOL 1
+#define TCPOPT_PAD 0 /* padding after EOL */
+#define TCPOLEN_PAD 1
+#define TCPOPT_NOP 1
+#define TCPOLEN_NOP 1
+#define TCPOPT_MAXSEG 2
+#define TCPOLEN_MAXSEG 4
+#define TCPOPT_WINDOW 3
+#define TCPOLEN_WINDOW 3
+#define TCPOPT_SACK_PERMITTED 4
+#define TCPOLEN_SACK_PERMITTED 2
+#define TCPOPT_SACK 5
+#define TCPOLEN_SACKHDR 2
+#define TCPOLEN_SACK 8 /* 2*sizeof(tcp_seq) */
+#define TCPOPT_TIMESTAMP 8
+#define TCPOLEN_TIMESTAMP 10
+#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
+#define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */
+#define TCPOLEN_SIGNATURE 18
+
+/* Miscellaneous constants */
+#define MAX_SACK_BLKS 6 /* Max # SACK blocks stored at receiver side */
+#define TCP_MAX_SACK 4 /* MAX # SACKs sent in any segment */
+
+
+/*
+ * Default maximum segment size for TCP.
+ * With an IP MTU of 576, this is 536,
+ * but 512 is probably more convenient.
+ * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
+ */
+#define TCP_MSS 512
+/*
+ * TCP_MINMSS is defined to be 216 which is fine for the smallest
+ * link MTU (256 bytes, AX.25 packet radio) in the Internet.
+ * However it is very unlikely to come across such low MTU interfaces
+ * these days (anno dato 2003).
+ * See tcp_subr.c tcp_minmss SYSCTL declaration for more comments.
+ * Setting this to "0" disables the minmss check.
+ */
+#define TCP_MINMSS 216
+
+/*
+ * Default maximum segment size for TCP6.
+ * With an IP6 MSS of 1280, this is 1220,
+ * but 1024 is probably more convenient. (xxx kazu in doubt)
+ * This should be defined as MIN(1024, IP6_MSS - sizeof (struct tcpip6hdr))
+ */
+#define TCP6_MSS 1024
+
+#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
+#define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */
+
+#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
+
+#define TCP_MAXBURST 4 /* maximum segments in a burst */
+
+#define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */
+#define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr))
+ /* max space left for options */
+#endif /* __BSD_VISIBLE */
+
+/*
+ * User-settable options (used with setsockopt).
+ */
+#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
+#if __BSD_VISIBLE
+#define TCP_MAXSEG 0x02 /* set maximum segment size */
+#define TCP_NOPUSH 0x04 /* don't push last block of write */
+#define TCP_NOOPT 0x08 /* don't use TCP options */
+#define TCP_MD5SIG 0x10 /* use MD5 digests (RFC2385) */
+#define TCP_INFO 0x20 /* retrieve tcp_info structure */
+#define TCP_CONGESTION 0x40 /* get/set congestion control algorithm */
+
+#define TCP_CA_NAME_MAX 16 /* max congestion control name length */
+
+#define TCPI_OPT_TIMESTAMPS 0x01
+#define TCPI_OPT_SACK 0x02
+#define TCPI_OPT_WSCALE 0x04
+#define TCPI_OPT_ECN 0x08
+#define TCPI_OPT_TOE 0x10
+
+/*
+ * The TCP_INFO socket option comes from the Linux 2.6 TCP API, and permits
+ * the caller to query certain information about the state of a TCP
+ * connection. We provide an overlapping set of fields with the Linux
+ * implementation, but since this is a fixed size structure, room has been
+ * left for growth. In order to maximize potential future compatibility with
+ * the Linux API, the same variable names and order have been adopted, and
+ * padding left to make room for omitted fields in case they are added later.
+ *
+ * XXX: This is currently an unstable ABI/API, in that it is expected to
+ * change.
+ */
+struct tcp_info {
+ u_int8_t tcpi_state; /* TCP FSM state. */
+ u_int8_t __tcpi_ca_state;
+ u_int8_t __tcpi_retransmits;
+ u_int8_t __tcpi_probes;
+ u_int8_t __tcpi_backoff;
+ u_int8_t tcpi_options; /* Options enabled on conn. */
+ u_int8_t tcpi_snd_wscale:4, /* RFC1323 send shift value. */
+ tcpi_rcv_wscale:4; /* RFC1323 recv shift value. */
+
+ u_int32_t __tcpi_rto;
+ u_int32_t __tcpi_ato;
+ u_int32_t __tcpi_snd_mss;
+ u_int32_t __tcpi_rcv_mss;
+
+ u_int32_t __tcpi_unacked;
+ u_int32_t __tcpi_sacked;
+ u_int32_t __tcpi_lost;
+ u_int32_t __tcpi_retrans;
+ u_int32_t __tcpi_fackets;
+
+ /* Times; measurements in usecs. */
+ u_int32_t __tcpi_last_data_sent;
+ u_int32_t __tcpi_last_ack_sent; /* Also unimpl. on Linux? */
+ u_int32_t __tcpi_last_data_recv;
+ u_int32_t __tcpi_last_ack_recv;
+
+ /* Metrics; variable units. */
+ u_int32_t __tcpi_pmtu;
+ u_int32_t __tcpi_rcv_ssthresh;
+ u_int32_t tcpi_rtt; /* Smoothed RTT in usecs. */
+ u_int32_t tcpi_rttvar; /* RTT variance in usecs. */
+ u_int32_t tcpi_snd_ssthresh; /* Slow start threshold. */
+ u_int32_t tcpi_snd_cwnd; /* Send congestion window. */
+ u_int32_t __tcpi_advmss;
+ u_int32_t __tcpi_reordering;
+
+ u_int32_t __tcpi_rcv_rtt;
+ u_int32_t tcpi_rcv_space; /* Advertised recv window. */
+
+ /* FreeBSD extensions to tcp_info. */
+ u_int32_t tcpi_snd_wnd; /* Advertised send window. */
+ u_int32_t tcpi_snd_bwnd; /* Bandwidth send window. */
+ u_int32_t tcpi_snd_nxt; /* Next egress seqno */
+ u_int32_t tcpi_rcv_nxt; /* Next ingress seqno */
+ u_int32_t tcpi_toe_tid; /* HWTID for TOE endpoints */
+
+ /* Padding to grow without breaking ABI. */
+ u_int32_t __tcpi_pad[29]; /* Padding. */
+};
+#endif
+
+#endif /* !_NETINET_TCP_H_ */
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