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   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
  34  */
  35
  36 /*
  37  * TCP header.
  38  * Per RFC 793, September, 1981.
  39  */
  40 struct tcphdr {
  41         nd_uint16_t     th_sport;               /* source port */
  42         nd_uint16_t     th_dport;               /* destination port */
  43         nd_uint32_t     th_seq;                 /* sequence number */
  44         nd_uint32_t     th_ack;                 /* acknowledgement number */
  45         nd_uint8_t      th_offx2;               /* data offset, rsvd */
  46         nd_uint8_t      th_flags;
  47         nd_uint16_t     th_win;                 /* window */
  48         nd_uint16_t     th_sum;                 /* checksum */
  49         nd_uint16_t     th_urp;                 /* urgent pointer */
  50 };
  51
  52 #define TH_OFF(th)      ((GET_U_1((th)->th_offx2) & 0xf0) >> 4)
  53 #define tcp_get_flags(th)       ((GET_U_1((th)->th_flags)) | \
  54                         ((GET_U_1((th)->th_offx2) & 0x0f) << 8))
  55
  56 /* TCP flags */
  57 #define TH_FIN     0x01
  58 #define TH_SYN     0x02
  59 #define TH_RST     0x04
  60 #define TH_PUSH    0x08
  61 #define TH_ACK     0x10
  62 #define TH_URG     0x20
  63 #define TH_ECNECHO 0x40 /* ECN Echo */
  64 #define TH_CWR     0x80 /* ECN Cwnd Reduced */
  65 #define TH_AE     0x100 /* AccECN (draft-ietf-tcpm-accurate-ecn;rfc7560) part of L4S (rfc9330) */
  66 extern const struct tok tcp_flag_values[];
  67
  68
  69 #define TCPOPT_EOL              0
  70 #define TCPOPT_NOP              1
  71 #define TCPOPT_MAXSEG           2
  72 #define    TCPOLEN_MAXSEG               4
  73 #define TCPOPT_WSCALE           3       /* window scale factor (rfc1323) */
  74 #define TCPOPT_SACKOK           4       /* selective ack ok (rfc2018) */
  75 #define TCPOPT_SACK             5       /* selective ack (rfc2018) */
  76 #define TCPOPT_ECHO             6       /* echo (rfc1072) */
  77 #define TCPOPT_ECHOREPLY        7       /* echo (rfc1072) */
  78 #define TCPOPT_TIMESTAMP        8       /* timestamp (rfc1323) */
  79 #define    TCPOLEN_TIMESTAMP            10
  80 #define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
  81 #define TCPOPT_CC               11      /* T/TCP CC options (rfc1644) */
  82 #define TCPOPT_CCNEW            12      /* T/TCP CC options (rfc1644) */
  83 #define TCPOPT_CCECHO           13      /* T/TCP CC options (rfc1644) */
  84 #define TCPOPT_SIGNATURE        19      /* Keyed MD5 (rfc2385) */
  85 #define    TCPOLEN_SIGNATURE            18
  86 #define TCP_SIGLEN 16                   /* length of an option 19 digest */
  87 #define TCPOPT_SCPS             20      /* SCPS-TP (CCSDS 714.0-B-2) */
  88 #define TCPOPT_UTO              28      /* tcp user timeout (rfc5482) */
  89 #define    TCPOLEN_UTO                  4
  90 #define TCPOPT_TCPAO            29      /* TCP authentication option (rfc5925) */
  91 #define TCPOPT_MPTCP            30      /* MPTCP options */
  92 #define TCPOPT_FASTOPEN         34      /* TCP Fast Open (rfc7413) */
  93 #define TCPOPT_EXPERIMENT2      254     /* experimental headers (rfc4727) */
  94
  95 #define TCPOPT_TSTAMP_HDR       \
  96     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
  97
  98 #ifndef FTP_PORT
  99 #define FTP_PORT                21
 100 #endif
 101 #ifndef SSH_PORT
 102 #define SSH_PORT                22
 103 #endif
 104 #ifndef TELNET_PORT
 105 #define TELNET_PORT             23
 106 #endif
 107 #ifndef SMTP_PORT
 108 #define SMTP_PORT               25
 109 #endif
 110 #ifndef WHOIS_PORT
 111 #define WHOIS_PORT              43
 112 #endif
 113 #ifndef NAMESERVER_PORT
 114 #define NAMESERVER_PORT         53
 115 #endif
 116 #ifndef HTTP_PORT
 117 #define HTTP_PORT               80
 118 #endif
 119 #ifndef NETBIOS_SSN_PORT
 120 #define NETBIOS_SSN_PORT        139     /* RFC 1001, RFC 1002 */
 121 #endif
 122 #ifndef BGP_PORT
 123 #define BGP_PORT                179
 124 #endif
 125 #ifndef RPKI_RTR_PORT
 126 #define RPKI_RTR_PORT           323
 127 #endif
 128 #ifndef SMB_PORT
 129 #define SMB_PORT                445
 130 #endif
 131 #ifndef RTSP_PORT
 132 #define RTSP_PORT               554
 133 #endif
 134 #ifndef MSDP_PORT
 135 #define MSDP_PORT               639
 136 #endif
 137 #ifndef LDP_PORT
 138 #define LDP_PORT                646
 139 #endif
 140 #ifndef PPTP_PORT
 141 #define PPTP_PORT               1723
 142 #endif
 143 #ifndef NFS_PORT
 144 #define NFS_PORT                2049
 145 #endif
 146 #ifndef REDIS_PORT
 147 #define REDIS_PORT              6379
 148 #endif
 149 #ifndef OPENFLOW_PORT_OLD
 150 #define OPENFLOW_PORT_OLD       6633
 151 #endif
 152 #ifndef OPENFLOW_PORT_IANA
 153 #define OPENFLOW_PORT_IANA      6653
 154 #endif
 155 #ifndef HTTP_PORT_ALT
 156 #define HTTP_PORT_ALT           8080
 157 #endif
 158 #ifndef RTSP_PORT_ALT
 159 #define RTSP_PORT_ALT           8554
 160 #endif
 161 #ifndef BEEP_PORT
 162 #define BEEP_PORT               10288
 163 #endif