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29 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
32 #ifndef _NETINET_TCP_H
33 #define _NETINET_TCP_H 1
38 * User-settable options (used with setsockopt).
40 #define TCP_NODELAY 1 /* Don't delay send to coalesce packets */
41 #define TCP_MAXSEG 2 /* Set maximum segment size */
42 #define TCP_CORK 3 /* Control sending of partial frames */
43 #define TCP_KEEPIDLE 4 /* Start keeplives after this period */
44 #define TCP_KEEPINTVL 5 /* Interval between keepalives */
45 #define TCP_KEEPCNT 6 /* Number of keepalives before death */
46 #define TCP_SYNCNT 7 /* Number of SYN retransmits */
47 #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
48 #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
49 #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
50 #define TCP_INFO 11 /* Information about this connection. */
51 #define TCP_QUICKACK 12 /* Bock/reenable quick ACKs. */
52 #define TCP_CONGESTION 13 /* Congestion control algorithm. */
53 #define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */
54 #define TCP_COOKIE_TRANSACTIONS 15 /* TCP Cookie Transactions */
55 #define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/
56 #define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */
57 #define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */
58 #define TCP_REPAIR 19 /* TCP sock is under repair right now */
59 #define TCP_REPAIR_QUEUE 20 /* Set TCP queue to repair */
60 #define TCP_QUEUE_SEQ 21 /* Set sequence number of repaired queue. */
61 #define TCP_REPAIR_OPTIONS 22 /* Repair TCP connection options */
62 #define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */
63 #define TCP_TIMESTAMP 24 /* TCP time stamp */
64 #define TCP_NOTSENT_LOWAT 25 /* Limit number of unsent bytes in
66 #define TCP_CC_INFO 26 /* Get Congestion Control
68 #define TCP_SAVE_SYN 27 /* Record SYN headers for new
70 #define TCP_SAVED_SYN 28 /* Get SYN headers recorded for
74 # include <sys/types.h>
75 # include <sys/socket.h>
77 typedef u_int32_t tcp_seq
;
80 * Per RFC 793, September, 1981.
88 u_int16_t th_sport
; /* source port */
89 u_int16_t th_dport
; /* destination port */
90 tcp_seq th_seq
; /* sequence number */
91 tcp_seq th_ack
; /* acknowledgement number */
92 # if __BYTE_ORDER == __LITTLE_ENDIAN
93 u_int8_t th_x2
:4; /* (unused) */
94 u_int8_t th_off
:4; /* data offset */
96 # if __BYTE_ORDER == __BIG_ENDIAN
97 u_int8_t th_off
:4; /* data offset */
98 u_int8_t th_x2
:4; /* (unused) */
104 # define TH_PUSH 0x08
107 u_int16_t th_win
; /* window */
108 u_int16_t th_sum
; /* checksum */
109 u_int16_t th_urp
; /* urgent pointer */
117 # if __BYTE_ORDER == __LITTLE_ENDIAN
127 # elif __BYTE_ORDER == __BIG_ENDIAN
138 # error "Adjust your <bits/endian.h> defines"
159 TCP_CLOSING
/* now a valid state */
162 # define TCPOPT_EOL 0
163 # define TCPOPT_NOP 1
164 # define TCPOPT_MAXSEG 2
165 # define TCPOLEN_MAXSEG 4
166 # define TCPOPT_WINDOW 3
167 # define TCPOLEN_WINDOW 3
168 # define TCPOPT_SACK_PERMITTED 4 /* Experimental */
169 # define TCPOLEN_SACK_PERMITTED 2
170 # define TCPOPT_SACK 5 /* Experimental */
171 # define TCPOPT_TIMESTAMP 8
172 # define TCPOLEN_TIMESTAMP 10
173 # define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
175 # define TCPOPT_TSTAMP_HDR \
176 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
179 * Default maximum segment size for TCP.
180 * With an IP MSS of 576, this is 536,
181 * but 512 is probably more convenient.
182 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
186 # define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
188 # define TCP_MAX_WINSHIFT 14 /* maximum window shift */
190 # define SOL_TCP 6 /* TCP level */
193 # define TCPI_OPT_TIMESTAMPS 1
194 # define TCPI_OPT_SACK 2
195 # define TCPI_OPT_WSCALE 4
196 # define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */
197 # define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
198 # define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
200 /* Values for tcpi_state. */
213 u_int8_t tcpi_ca_state
;
214 u_int8_t tcpi_retransmits
;
215 u_int8_t tcpi_probes
;
216 u_int8_t tcpi_backoff
;
217 u_int8_t tcpi_options
;
218 u_int8_t tcpi_snd_wscale
: 4, tcpi_rcv_wscale
: 4;
222 u_int32_t tcpi_snd_mss
;
223 u_int32_t tcpi_rcv_mss
;
225 u_int32_t tcpi_unacked
;
226 u_int32_t tcpi_sacked
;
228 u_int32_t tcpi_retrans
;
229 u_int32_t tcpi_fackets
;
232 u_int32_t tcpi_last_data_sent
;
233 u_int32_t tcpi_last_ack_sent
; /* Not remembered, sorry. */
234 u_int32_t tcpi_last_data_recv
;
235 u_int32_t tcpi_last_ack_recv
;
239 u_int32_t tcpi_rcv_ssthresh
;
241 u_int32_t tcpi_rttvar
;
242 u_int32_t tcpi_snd_ssthresh
;
243 u_int32_t tcpi_snd_cwnd
;
244 u_int32_t tcpi_advmss
;
245 u_int32_t tcpi_reordering
;
247 u_int32_t tcpi_rcv_rtt
;
248 u_int32_t tcpi_rcv_space
;
250 u_int32_t tcpi_total_retrans
;
254 /* For TCP_MD5SIG socket option. */
255 #define TCP_MD5SIG_MAXKEYLEN 80
259 struct sockaddr_storage tcpm_addr
; /* Address associated. */
260 u_int16_t __tcpm_pad1
; /* Zero. */
261 u_int16_t tcpm_keylen
; /* Key length. */
262 u_int32_t __tcpm_pad2
; /* Zero. */
263 u_int8_t tcpm_key
[TCP_MD5SIG_MAXKEYLEN
]; /* Key (binary). */
266 /* For socket repair options. */
267 struct tcp_repair_opt
273 /* Queue to repair, for TCP_REPAIR_QUEUE. */
282 /* For cookie transactions socket options. */
283 #define TCP_COOKIE_MIN 8 /* 64-bits */
284 #define TCP_COOKIE_MAX 16 /* 128-bits */
285 #define TCP_COOKIE_PAIR_SIZE (2*TCP_COOKIE_MAX)
287 /* Flags for both getsockopt and setsockopt */
288 #define TCP_COOKIE_IN_ALWAYS (1 << 0) /* Discard SYN without cookie */
289 #define TCP_COOKIE_OUT_NEVER (1 << 1) /* Prohibit outgoing cookies,
290 * supercedes everything. */
292 /* Flags for getsockopt */
293 #define TCP_S_DATA_IN (1 << 2) /* Was data received? */
294 #define TCP_S_DATA_OUT (1 << 3) /* Was data sent? */
296 #define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */
297 #define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */
299 struct tcp_cookie_transactions
301 u_int16_t tcpct_flags
;
302 u_int8_t __tcpct_pad1
;
303 u_int8_t tcpct_cookie_desired
;
304 u_int16_t tcpct_s_data_desired
;
305 u_int16_t tcpct_used
;
306 u_int8_t tcpct_value
[TCP_MSS_DEFAULT
];
311 #endif /* netinet/tcp.h */