| /*- |
| * 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 |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _BSD_NETINET_TCP_H_ |
| #define _BSD_NETINET_TCP_H_ |
| |
| #include <sys/bsd_cdefs.h> |
| |
| #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 /* !_BSD_NETINET_TCP_H_ */ |