move dnet to the correct place so that we use this --HG-- rename : ext/dnet/dnet/addr.h => ext/dnet/addr.h rename : ext/dnet/dnet/arp.h => ext/dnet/arp.h rename : ext/dnet/dnet/blob.h => ext/dnet/blob.h rename : ext/dnet/dnet/eth.h => ext/dnet/eth.h rename : ext/dnet/dnet/fw.h => ext/dnet/fw.h rename : ext/dnet/dnet/icmp.h => ext/dnet/icmp.h rename : ext/dnet/dnet/intf.h => ext/dnet/intf.h rename : ext/dnet/dnet/ip.h => ext/dnet/ip.h rename : ext/dnet/dnet/ip6.h => ext/dnet/ip6.h rename : ext/dnet/dnet/os.h => ext/dnet/os.h rename : ext/dnet/dnet/rand.h => ext/dnet/rand.h rename : ext/dnet/dnet/route.h => ext/dnet/route.h rename : ext/dnet/dnet/tcp.h => ext/dnet/tcp.h rename : ext/dnet/dnet/udp.h => ext/dnet/udp.h
158 lines
5.4 KiB
C
158 lines
5.4 KiB
C
/*
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* tcp.h
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*
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* Transmission Control Protocol (RFC 793).
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*
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* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
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*
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* $Id: tcp.h,v 1.17 2004/02/23 10:02:11 dugsong Exp $
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*/
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#ifndef DNET_TCP_H
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#define DNET_TCP_H
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#define TCP_HDR_LEN 20 /* base TCP header length */
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#define TCP_OPT_LEN 2 /* base TCP option length */
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#define TCP_OPT_LEN_MAX 40
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#define TCP_HDR_LEN_MAX (TCP_HDR_LEN + TCP_OPT_LEN_MAX)
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#ifndef __GNUC__
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# define __attribute__(x)
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# pragma pack(1)
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#endif
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/*
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* TCP header, without options
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*/
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struct tcp_hdr {
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uint16_t th_sport; /* source port */
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uint16_t th_dport; /* destination port */
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uint32_t th_seq; /* sequence number */
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uint32_t th_ack; /* acknowledgment number */
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#if DNET_BYTESEX == DNET_BIG_ENDIAN
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uint8_t th_off:4, /* data offset */
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th_x2:4; /* (unused) */
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#elif DNET_BYTESEX == DNET_LIL_ENDIAN
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uint8_t th_x2:4,
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th_off:4;
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#else
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# error "need to include <dnet.h>"
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#endif
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uint8_t th_flags; /* control flags */
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uint16_t th_win; /* window */
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uint16_t th_sum; /* checksum */
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uint16_t th_urp; /* urgent pointer */
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};
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/*
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* TCP control flags (th_flags)
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*/
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#define TH_FIN 0x01 /* end of data */
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#define TH_SYN 0x02 /* synchronize sequence numbers */
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#define TH_RST 0x04 /* reset connection */
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#define TH_PUSH 0x08 /* push */
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#define TH_ACK 0x10 /* acknowledgment number set */
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#define TH_URG 0x20 /* urgent pointer set */
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#define TH_ECE 0x40 /* ECN echo, RFC 3168 */
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#define TH_CWR 0x80 /* congestion window reduced */
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#define TCP_PORT_MAX 65535 /* maximum port */
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#define TCP_WIN_MAX 65535 /* maximum (unscaled) window */
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/*
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* Sequence number comparison macros
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*/
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#define TCP_SEQ_LT(a,b) ((int)((a)-(b)) < 0)
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#define TCP_SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
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#define TCP_SEQ_GT(a,b) ((int)((a)-(b)) > 0)
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#define TCP_SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
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/*
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* TCP FSM states
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*/
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#define TCP_STATE_CLOSED 0 /* closed */
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#define TCP_STATE_LISTEN 1 /* listening from connection */
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#define TCP_STATE_SYN_SENT 2 /* active, have sent SYN */
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#define TCP_STATE_SYN_RECEIVED 3 /* have sent and received SYN */
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#define TCP_STATE_ESTABLISHED 4 /* established */
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#define TCP_STATE_CLOSE_WAIT 5 /* rcvd FIN, waiting for close */
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#define TCP_STATE_FIN_WAIT_1 6 /* have closed, sent FIN */
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#define TCP_STATE_CLOSING 7 /* closed xchd FIN, await FIN-ACK */
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#define TCP_STATE_LAST_ACK 8 /* had FIN and close, await FIN-ACK */
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#define TCP_STATE_FIN_WAIT_2 9 /* have closed, FIN is acked */
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#define TCP_STATE_TIME_WAIT 10 /* in 2*MSL quiet wait after close */
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#define TCP_STATE_MAX 11
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/*
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* Options (opt_type) - http://www.iana.org/assignments/tcp-parameters
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*/
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#define TCP_OPT_EOL 0 /* end of option list */
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#define TCP_OPT_NOP 1 /* no operation */
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#define TCP_OPT_MSS 2 /* maximum segment size */
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#define TCP_OPT_WSCALE 3 /* window scale factor, RFC 1072 */
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#define TCP_OPT_SACKOK 4 /* SACK permitted, RFC 2018 */
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#define TCP_OPT_SACK 5 /* SACK, RFC 2018 */
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#define TCP_OPT_ECHO 6 /* echo (obsolete), RFC 1072 */
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#define TCP_OPT_ECHOREPLY 7 /* echo reply (obsolete), RFC 1072 */
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#define TCP_OPT_TIMESTAMP 8 /* timestamp, RFC 1323 */
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#define TCP_OPT_POCONN 9 /* partial order conn, RFC 1693 */
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#define TCP_OPT_POSVC 10 /* partial order service, RFC 1693 */
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#define TCP_OPT_CC 11 /* connection count, RFC 1644 */
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#define TCP_OPT_CCNEW 12 /* CC.NEW, RFC 1644 */
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#define TCP_OPT_CCECHO 13 /* CC.ECHO, RFC 1644 */
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#define TCP_OPT_ALTSUM 14 /* alt checksum request, RFC 1146 */
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#define TCP_OPT_ALTSUMDATA 15 /* alt checksum data, RFC 1146 */
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#define TCP_OPT_SKEETER 16 /* Skeeter */
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#define TCP_OPT_BUBBA 17 /* Bubba */
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#define TCP_OPT_TRAILSUM 18 /* trailer checksum */
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#define TCP_OPT_MD5 19 /* MD5 signature, RFC 2385 */
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#define TCP_OPT_SCPS 20 /* SCPS capabilities */
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#define TCP_OPT_SNACK 21 /* selective negative acks */
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#define TCP_OPT_REC 22 /* record boundaries */
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#define TCP_OPT_CORRUPT 23 /* corruption experienced */
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#define TCP_OPT_SNAP 24 /* SNAP */
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#define TCP_OPT_TCPCOMP 26 /* TCP compression filter */
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#define TCP_OPT_MAX 27
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#define TCP_OPT_TYPEONLY(type) \
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((type) == TCP_OPT_EOL || (type) == TCP_OPT_NOP)
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/*
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* TCP option (following TCP header)
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*/
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struct tcp_opt {
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uint8_t opt_type; /* option type */
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uint8_t opt_len; /* option length >= TCP_OPT_LEN */
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union tcp_opt_data {
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uint16_t mss; /* TCP_OPT_MSS */
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uint8_t wscale; /* TCP_OPT_WSCALE */
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uint16_t sack[19]; /* TCP_OPT_SACK */
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uint32_t echo; /* TCP_OPT_ECHO{REPLY} */
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uint32_t timestamp[2]; /* TCP_OPT_TIMESTAMP */
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uint32_t cc; /* TCP_OPT_CC{NEW,ECHO} */
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uint8_t cksum; /* TCP_OPT_ALTSUM */
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uint8_t md5[16]; /* TCP_OPT_MD5 */
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uint8_t data8[TCP_OPT_LEN_MAX - TCP_OPT_LEN];
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} opt_data;
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} __attribute__((__packed__));
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#ifndef __GNUC__
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# pragma pack()
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#endif
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#define tcp_pack_hdr(hdr, sport, dport, seq, ack, flags, win, urp) do { \
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struct tcp_hdr *tcp_pack_p = (struct tcp_hdr *)(hdr); \
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tcp_pack_p->th_sport = htons(sport); \
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tcp_pack_p->th_dport = htons(dport); \
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tcp_pack_p->th_seq = htonl(seq); \
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tcp_pack_p->th_ack = htonl(ack); \
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tcp_pack_p->th_x2 = 0; tcp_pack_p->th_off = 5; \
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tcp_pack_p->th_flags = flags; \
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tcp_pack_p->th_win = htons(win); \
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tcp_pack_p->th_urp = htons(urp); \
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} while (0)
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#endif /* DNET_TCP_H */
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