/usr/include/dumbnet/tcp.h is in libdumbnet-dev 1.12-4build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* tcp.h
*
* Transmission Control Protocol (RFC 793).
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
*
* $Id: tcp.h 487 2004-02-23 10:02:11Z dugsong $
*/
#ifndef DNET_TCP_H
#define DNET_TCP_H
#define TCP_HDR_LEN 20 /* base TCP header length */
#define TCP_OPT_LEN 2 /* base TCP option length */
#define TCP_OPT_LEN_MAX 40
#define TCP_HDR_LEN_MAX (TCP_HDR_LEN + TCP_OPT_LEN_MAX)
#ifndef __GNUC__
# define __attribute__(x)
# pragma pack(1)
#endif
/*
* TCP header, without options
*/
struct tcp_hdr {
uint16_t th_sport; /* source port */
uint16_t th_dport; /* destination port */
uint32_t th_seq; /* sequence number */
uint32_t th_ack; /* acknowledgment number */
#if DNET_BYTESEX == DNET_BIG_ENDIAN
uint8_t th_off:4, /* data offset */
th_x2:4; /* (unused) */
#elif DNET_BYTESEX == DNET_LIL_ENDIAN
uint8_t th_x2:4,
th_off:4;
#else
# error "need to include <dnet.h>"
#endif
uint8_t th_flags; /* control flags */
uint16_t th_win; /* window */
uint16_t th_sum; /* checksum */
uint16_t th_urp; /* urgent pointer */
};
/*
* TCP control flags (th_flags)
*/
#define TH_FIN 0x01 /* end of data */
#define TH_SYN 0x02 /* synchronize sequence numbers */
#define TH_RST 0x04 /* reset connection */
#define TH_PUSH 0x08 /* push */
#define TH_ACK 0x10 /* acknowledgment number set */
#define TH_URG 0x20 /* urgent pointer set */
#define TH_ECE 0x40 /* ECN echo, RFC 3168 */
#define TH_CWR 0x80 /* congestion window reduced */
#define TCP_PORT_MAX 65535 /* maximum port */
#define TCP_WIN_MAX 65535 /* maximum (unscaled) window */
/*
* Sequence number comparison macros
*/
#define TCP_SEQ_LT(a,b) ((int)((a)-(b)) < 0)
#define TCP_SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
#define TCP_SEQ_GT(a,b) ((int)((a)-(b)) > 0)
#define TCP_SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
/*
* TCP FSM states
*/
#define TCP_STATE_CLOSED 0 /* closed */
#define TCP_STATE_LISTEN 1 /* listening from connection */
#define TCP_STATE_SYN_SENT 2 /* active, have sent SYN */
#define TCP_STATE_SYN_RECEIVED 3 /* have sent and received SYN */
#define TCP_STATE_ESTABLISHED 4 /* established */
#define TCP_STATE_CLOSE_WAIT 5 /* rcvd FIN, waiting for close */
#define TCP_STATE_FIN_WAIT_1 6 /* have closed, sent FIN */
#define TCP_STATE_CLOSING 7 /* closed xchd FIN, await FIN-ACK */
#define TCP_STATE_LAST_ACK 8 /* had FIN and close, await FIN-ACK */
#define TCP_STATE_FIN_WAIT_2 9 /* have closed, FIN is acked */
#define TCP_STATE_TIME_WAIT 10 /* in 2*MSL quiet wait after close */
#define TCP_STATE_MAX 11
/*
* Options (opt_type) - http://www.iana.org/assignments/tcp-parameters
*/
#define TCP_OPT_EOL 0 /* end of option list */
#define TCP_OPT_NOP 1 /* no operation */
#define TCP_OPT_MSS 2 /* maximum segment size */
#define TCP_OPT_WSCALE 3 /* window scale factor, RFC 1072 */
#define TCP_OPT_SACKOK 4 /* SACK permitted, RFC 2018 */
#define TCP_OPT_SACK 5 /* SACK, RFC 2018 */
#define TCP_OPT_ECHO 6 /* echo (obsolete), RFC 1072 */
#define TCP_OPT_ECHOREPLY 7 /* echo reply (obsolete), RFC 1072 */
#define TCP_OPT_TIMESTAMP 8 /* timestamp, RFC 1323 */
#define TCP_OPT_POCONN 9 /* partial order conn, RFC 1693 */
#define TCP_OPT_POSVC 10 /* partial order service, RFC 1693 */
#define TCP_OPT_CC 11 /* connection count, RFC 1644 */
#define TCP_OPT_CCNEW 12 /* CC.NEW, RFC 1644 */
#define TCP_OPT_CCECHO 13 /* CC.ECHO, RFC 1644 */
#define TCP_OPT_ALTSUM 14 /* alt checksum request, RFC 1146 */
#define TCP_OPT_ALTSUMDATA 15 /* alt checksum data, RFC 1146 */
#define TCP_OPT_SKEETER 16 /* Skeeter */
#define TCP_OPT_BUBBA 17 /* Bubba */
#define TCP_OPT_TRAILSUM 18 /* trailer checksum */
#define TCP_OPT_MD5 19 /* MD5 signature, RFC 2385 */
#define TCP_OPT_SCPS 20 /* SCPS capabilities */
#define TCP_OPT_SNACK 21 /* selective negative acks */
#define TCP_OPT_REC 22 /* record boundaries */
#define TCP_OPT_CORRUPT 23 /* corruption experienced */
#define TCP_OPT_SNAP 24 /* SNAP */
#define TCP_OPT_TCPCOMP 26 /* TCP compression filter */
#define TCP_OPT_MAX 27
#define TCP_OPT_TYPEONLY(type) \
((type) == TCP_OPT_EOL || (type) == TCP_OPT_NOP)
/*
* TCP option (following TCP header)
*/
struct tcp_opt {
uint8_t opt_type; /* option type */
uint8_t opt_len; /* option length >= TCP_OPT_LEN */
union tcp_opt_data {
uint16_t mss; /* TCP_OPT_MSS */
uint8_t wscale; /* TCP_OPT_WSCALE */
uint16_t sack[19]; /* TCP_OPT_SACK */
uint32_t echo; /* TCP_OPT_ECHO{REPLY} */
uint32_t timestamp[2]; /* TCP_OPT_TIMESTAMP */
uint32_t cc; /* TCP_OPT_CC{NEW,ECHO} */
uint8_t cksum; /* TCP_OPT_ALTSUM */
uint8_t md5[16]; /* TCP_OPT_MD5 */
uint8_t data8[TCP_OPT_LEN_MAX - TCP_OPT_LEN];
} opt_data;
} __attribute__((__packed__));
#ifndef __GNUC__
# pragma pack()
#endif
#define tcp_pack_hdr(hdr, sport, dport, seq, ack, flags, win, urp) do { \
struct tcp_hdr *tcp_pack_p = (struct tcp_hdr *)(hdr); \
tcp_pack_p->th_sport = htons(sport); \
tcp_pack_p->th_dport = htons(dport); \
tcp_pack_p->th_seq = htonl(seq); \
tcp_pack_p->th_ack = htonl(ack); \
tcp_pack_p->th_x2 = 0; tcp_pack_p->th_off = 5; \
tcp_pack_p->th_flags = flags; \
tcp_pack_p->th_win = htons(win); \
tcp_pack_p->th_urp = htons(urp); \
} while (0)
#endif /* DNET_TCP_H */
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