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The C and C++ Include Header Files
cat -n /usr/include/netinet/tcp.h
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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)tcp.h 8.1 (Berkeley) 6/10/93 30 */ 31 32 #ifndef _NETINET_TCP_H 33 #define _NETINET_TCP_H 1 34 35 #include <features.h> 36 37 /* 38 * User-settable options (used with setsockopt). 39 */ 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/re-enable 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 65 write queue. */ 66 #define TCP_CC_INFO 26 /* Get Congestion Control 67 (optional) info. */ 68 #define TCP_SAVE_SYN 27 /* Record SYN headers for new 69 connections. */ 70 #define TCP_SAVED_SYN 28 /* Get SYN headers recorded for 71 connection. */ 72 #define TCP_REPAIR_WINDOW 29 /* Get/set window parameters. */ 73 #define TCP_FASTOPEN_CONNECT 30 /* Attempt FastOpen with connect. */ 74 #define TCP_ULP 31 /* Attach a ULP to a TCP connection. */ 75 #define TCP_MD5SIG_EXT 32 /* TCP MD5 Signature with extensions. */ 76 #define TCP_FASTOPEN_KEY 33 /* Set the key for Fast Open (cookie). */ 77 #define TCP_FASTOPEN_NO_COOKIE 34 /* Enable TFO without a TFO cookie. */ 78 #define TCP_ZEROCOPY_RECEIVE 35 79 #define TCP_INQ 36 /* Notify bytes available to read 80 as a cmsg on read. */ 81 #define TCP_CM_INQ TCP_INQ 82 #define TCP_TX_DELAY 37 /* Delay outgoing packets by XX usec. */ 83 84 #define TCP_REPAIR_ON 1 85 #define TCP_REPAIR_OFF 0 86 #define TCP_REPAIR_OFF_NO_WP -1 87 88 #ifdef __USE_MISC 89 # include <sys/types.h> 90 # include <sys/socket.h> 91 # include <stdint.h> 92 93 typedef uint32_t tcp_seq; 94 /* 95 * TCP header. 96 * Per RFC 793, September, 1981. 97 */ 98 struct tcphdr 99 { 100 __extension__ union 101 { 102 struct 103 { 104 uint16_t th_sport; /* source port */ 105 uint16_t th_dport; /* destination port */ 106 tcp_seq th_seq; /* sequence number */ 107 tcp_seq th_ack; /* acknowledgement number */ 108 # if __BYTE_ORDER == __LITTLE_ENDIAN 109 uint8_t th_x2:4; /* (unused) */ 110 uint8_t th_off:4; /* data offset */ 111 # endif 112 # if __BYTE_ORDER == __BIG_ENDIAN 113 uint8_t th_off:4; /* data offset */ 114 uint8_t th_x2:4; /* (unused) */ 115 # endif 116 uint8_t th_flags; 117 # define TH_FIN 0x01 118 # define TH_SYN 0x02 119 # define TH_RST 0x04 120 # define TH_PUSH 0x08 121 # define TH_ACK 0x10 122 # define TH_URG 0x20 123 uint16_t th_win; /* window */ 124 uint16_t th_sum; /* checksum */ 125 uint16_t th_urp; /* urgent pointer */ 126 }; 127 struct 128 { 129 uint16_t source; 130 uint16_t dest; 131 uint32_t seq; 132 uint32_t ack_seq; 133 # if __BYTE_ORDER == __LITTLE_ENDIAN 134 uint16_t res1:4; 135 uint16_t doff:4; 136 uint16_t fin:1; 137 uint16_t syn:1; 138 uint16_t rst:1; 139 uint16_t psh:1; 140 uint16_t ack:1; 141 uint16_t urg:1; 142 uint16_t res2:2; 143 # elif __BYTE_ORDER == __BIG_ENDIAN 144 uint16_t doff:4; 145 uint16_t res1:4; 146 uint16_t res2:2; 147 uint16_t urg:1; 148 uint16_t ack:1; 149 uint16_t psh:1; 150 uint16_t rst:1; 151 uint16_t syn:1; 152 uint16_t fin:1; 153 # else 154 # error "Adjust your <bits/endian.h> defines" 155 # endif 156 uint16_t window; 157 uint16_t check; 158 uint16_t urg_ptr; 159 }; 160 }; 161 }; 162 163 enum 164 { 165 TCP_ESTABLISHED = 1, 166 TCP_SYN_SENT, 167 TCP_SYN_RECV, 168 TCP_FIN_WAIT1, 169 TCP_FIN_WAIT2, 170 TCP_TIME_WAIT, 171 TCP_CLOSE, 172 TCP_CLOSE_WAIT, 173 TCP_LAST_ACK, 174 TCP_LISTEN, 175 TCP_CLOSING /* now a valid state */ 176 }; 177 178 # define TCPOPT_EOL 0 179 # define TCPOPT_NOP 1 180 # define TCPOPT_MAXSEG 2 181 # define TCPOLEN_MAXSEG 4 182 # define TCPOPT_WINDOW 3 183 # define TCPOLEN_WINDOW 3 184 # define TCPOPT_SACK_PERMITTED 4 /* Experimental */ 185 # define TCPOLEN_SACK_PERMITTED 2 186 # define TCPOPT_SACK 5 /* Experimental */ 187 # define TCPOPT_TIMESTAMP 8 188 # define TCPOLEN_TIMESTAMP 10 189 # define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 190 191 # define TCPOPT_TSTAMP_HDR \ 192 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 193 194 /* 195 * Default maximum segment size for TCP. 196 * With an IP MSS of 576, this is 536, 197 * but 512 is probably more convenient. 198 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). 199 */ 200 # define TCP_MSS 512 201 202 # define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ 203 204 # define TCP_MAX_WINSHIFT 14 /* maximum window shift */ 205 206 # define SOL_TCP 6 /* TCP level */ 207 208 209 # define TCPI_OPT_TIMESTAMPS 1 210 # define TCPI_OPT_SACK 2 211 # define TCPI_OPT_WSCALE 4 212 # define TCPI_OPT_ECN 8 /* ECN was negotiated at TCP session init */ 213 # define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */ 214 # define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */ 215 # define TCPI_OPT_USEC_TS 64 /* usec timestamps */ 216 # define TCPI_OPT_TFO_CHILD 128 /* child from a Fast Open option on SYN */ 217 218 219 /* Values for tcpi_state. */ 220 enum tcp_ca_state 221 { 222 TCP_CA_Open = 0, 223 TCP_CA_Disorder = 1, 224 TCP_CA_CWR = 2, 225 TCP_CA_Recovery = 3, 226 TCP_CA_Loss = 4 227 }; 228 229 struct tcp_info 230 { 231 uint8_t tcpi_state; 232 uint8_t tcpi_ca_state; 233 uint8_t tcpi_retransmits; 234 uint8_t tcpi_probes; 235 uint8_t tcpi_backoff; 236 uint8_t tcpi_options; 237 uint8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4; 238 239 uint32_t tcpi_rto; 240 uint32_t tcpi_ato; 241 uint32_t tcpi_snd_mss; 242 uint32_t tcpi_rcv_mss; 243 244 uint32_t tcpi_unacked; 245 uint32_t tcpi_sacked; 246 uint32_t tcpi_lost; 247 uint32_t tcpi_retrans; 248 uint32_t tcpi_fackets; 249 250 /* Times. */ 251 uint32_t tcpi_last_data_sent; 252 uint32_t tcpi_last_ack_sent; /* Not remembered, sorry. */ 253 uint32_t tcpi_last_data_recv; 254 uint32_t tcpi_last_ack_recv; 255 256 /* Metrics. */ 257 uint32_t tcpi_pmtu; 258 uint32_t tcpi_rcv_ssthresh; 259 uint32_t tcpi_rtt; 260 uint32_t tcpi_rttvar; 261 uint32_t tcpi_snd_ssthresh; 262 uint32_t tcpi_snd_cwnd; 263 uint32_t tcpi_advmss; 264 uint32_t tcpi_reordering; 265 266 uint32_t tcpi_rcv_rtt; 267 uint32_t tcpi_rcv_space; 268 269 uint32_t tcpi_total_retrans; 270 271 uint64_t tcpi_pacing_rate; 272 uint64_t tcpi_max_pacing_rate; 273 uint64_t tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */ 274 uint64_t tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */ 275 uint32_t tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */ 276 uint32_t tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */ 277 278 uint32_t tcpi_notsent_bytes; 279 uint32_t tcpi_min_rtt; 280 uint32_t tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */ 281 uint32_t tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */ 282 283 uint64_t tcpi_delivery_rate; 284 285 uint64_t tcpi_busy_time; /* Time (usec) busy sending data */ 286 uint64_t tcpi_rwnd_limited; /* Time (usec) limited by receive window */ 287 uint64_t tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */ 288 289 uint32_t tcpi_delivered; 290 uint32_t tcpi_delivered_ce; 291 292 uint64_t tcpi_bytes_sent; /* RFC4898 tcpEStatsPerfHCDataOctetsOut */ 293 uint64_t tcpi_bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans */ 294 uint32_t tcpi_dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups */ 295 uint32_t tcpi_reord_seen; /* reordering events seen */ 296 297 298 uint32_t tcpi_rcv_ooopack; /* Out-of-order packets received */ 299 /* Peer's advertised receive window after scaling (bytes) */ 300 uint32_t tcpi_snd_wnd; 301 /* Local advertised receive window after scaling (bytes) */ 302 uint32_t tcpi_rcv_wnd; 303 304 uint32_t tcpi_rehash; /* PLB or timeout triggered rehash attempts */ 305 /* Total number of RTO timeouts, including 306 * SYN/SYN-ACK and recurring timeouts 307 */ 308 uint16_t tcpi_total_rto; 309 /* Total number of RTO recoveries, including any unfinished recovery. */ 310 uint16_t tcpi_total_rto_recoveries; 311 /* Total time spent in RTO recoveries in milliseconds, including any 312 * unfinished recovery. 313 */ 314 uint32_t tcpi_total_rto_time; 315 uint32_t tcpi_received_ce; /* # of CE marks received */ 316 uint32_t tcpi_delivered_e1_bytes; /* Accurate ECN byte counters */ 317 uint32_t tcpi_delivered_e0_bytes; 318 uint32_t tcpi_delivered_ce_bytes; 319 uint32_t tcpi_received_e1_bytes; 320 uint32_t tcpi_received_e0_bytes; 321 uint32_t tcpi_received_ce_bytes; 322 uint16_t tcpi_accecn_fail_mode; 323 uint16_t tcpi_accecn_opt_seen; 324 }; 325 326 /* Netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */ 327 enum { 328 TCP_NLA_PAD, 329 TCP_NLA_BUSY, /* Time (usec) busy sending data */ 330 TCP_NLA_RWND_LIMITED, /* Time (usec) limited by receive window */ 331 TCP_NLA_SNDBUF_LIMITED, /* Time (usec) limited by send buffer */ 332 TCP_NLA_DATA_SEGS_OUT, /* Data pkts sent including retransmission */ 333 TCP_NLA_TOTAL_RETRANS, /* Data pkts retransmitted */ 334 TCP_NLA_PACING_RATE, /* Pacing rate in bytes per second */ 335 TCP_NLA_DELIVERY_RATE, /* Delivery rate in bytes per second */ 336 TCP_NLA_SND_CWND, /* Sending congestion window */ 337 TCP_NLA_REORDERING, /* Reordering metric */ 338 TCP_NLA_MIN_RTT, /* minimum RTT */ 339 TCP_NLA_RECUR_RETRANS, /* Recurring retransmits for the current pkt */ 340 TCP_NLA_DELIVERY_RATE_APP_LMT, /* delivery rate application limited ? */ 341 TCP_NLA_SNDQ_SIZE, /* Data (bytes) pending in send queue */ 342 TCP_NLA_CA_STATE, /* ca_state of socket */ 343 TCP_NLA_SND_SSTHRESH, /* Slow start size threshold */ 344 TCP_NLA_DELIVERED, /* Data pkts delivered incl. out-of-order */ 345 TCP_NLA_DELIVERED_CE, /* Like above but only ones w/ CE marks */ 346 TCP_NLA_BYTES_SENT, /* Data bytes sent including retransmission */ 347 TCP_NLA_BYTES_RETRANS, /* Data bytes retransmitted */ 348 TCP_NLA_DSACK_DUPS, /* DSACK blocks received */ 349 TCP_NLA_REORD_SEEN, /* reordering events seen */ 350 TCP_NLA_SRTT, /* smoothed RTT in usecs */ 351 TCP_NLA_TIMEOUT_REHASH, /* Timeout-triggered rehash attempts */ 352 TCP_NLA_BYTES_NOTSENT, /* Bytes in write queue not yet sent */ 353 TCP_NLA_EDT, /* Earliest departure time (CLOCK_MONOTONIC) */ 354 TCP_NLA_TTL, /* TTL or hop limit of a packet received */ 355 TCP_NLA_REHASH, /* PLB and timeout triggered rehash attempts */ 356 }; 357 358 /* For TCP_MD5SIG socket option. */ 359 #define TCP_MD5SIG_MAXKEYLEN 80 360 361 /* tcp_md5sig extension flags for TCP_MD5SIG_EXT. */ 362 #define TCP_MD5SIG_FLAG_PREFIX 1 /* Address prefix length. */ 363 #define TCP_MD5SIG_FLAG_IFINDEX 2 /* Ifindex set. */ 364 365 struct tcp_md5sig 366 { 367 struct sockaddr_storage tcpm_addr; /* Address associated. */ 368 uint8_t tcpm_flags; /* Extension flags. */ 369 uint8_t tcpm_prefixlen; /* Address prefix. */ 370 uint16_t tcpm_keylen; /* Key length. */ 371 int tcpm_ifindex; /* Device index for scope. */ 372 uint8_t tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* Key (binary). */ 373 }; 374 375 /* INET_DIAG_MD5SIG */ 376 struct tcp_diag_md5sig { 377 uint8_t tcpm_family; 378 uint8_t tcpm_prefixlen; 379 uint16_t tcpm_keylen; 380 uint32_t tcpm_addr[4]; 381 uint8_t tcpm_key[TCP_MD5SIG_MAXKEYLEN]; 382 }; 383 384 #define TCP_AO_MAXKEYLEN 80 385 386 #define TCP_AO_KEYF_IFINDEX (1 << 0) /* L3 ifindex for VRF */ 387 #define TCP_AO_KEYF_EXCLUDE_OPT (1 << 1) /* Indicates whether TCP options 388 * other than TCP-AO are included 389 * in the MAC calculation 390 */ 391 392 struct tcp_ao_add { /* setsockopt(TCP_AO_ADD_KEY) */ 393 struct sockaddr_storage addr; /* Peer's address for the key */ 394 int8_t alg_name[64]; /* Crypto hash algorithm to use */ 395 int32_t ifindex; /* L3 dev index for VRF */ 396 uint32_t set_current :1, /* Set key as Current_key at once */ 397 set_rnext :1, /* Request it from peer with RNext_key */ 398 reserved :30; /* Must be 0 */ 399 uint16_t reserved2; /* Padding, must be 0 */ 400 uint8_t prefix; /* Peer's address prefix */ 401 uint8_t sndid; /* SendID for outgoing segments */ 402 uint8_t rcvid; /* RecvID to match for incoming seg */ 403 uint8_t maclen; /* length of authentication code (hash) */ 404 uint8_t keyflags; /* See TCP_AO_KEYF_ */ 405 uint8_t keylen; /* Length of ::key */ 406 uint8_t key[TCP_AO_MAXKEYLEN]; 407 } __attribute__((aligned(8))); 408 409 struct tcp_ao_del { /* setsockopt(TCP_AO_DEL_KEY) */ 410 struct sockaddr_storage addr; /* Peer's address for the key */ 411 int32_t ifindex; /* L3 dev index for VRF */ 412 uint32_t set_current :1, /* Corresponding ::current_key */ 413 set_rnext :1, /* Corresponding ::rnext */ 414 del_async :1, /* Only valid for listen sockets */ 415 reserved :29; /* Must be 0 */ 416 uint16_t reserved2; /* Padding, must be 0 */ 417 uint8_t prefix; /* Peer's address prefix */ 418 uint8_t sndid; /* SendID for outgoing segments */ 419 uint8_t rcvid; /* RecvID to match for incoming seg */ 420 uint8_t current_key; /* KeyID to set as Current_key */ 421 uint8_t rnext; /* KeyID to set as Rnext_key */ 422 uint8_t keyflags; /* See TCP_AO_KEYF_ */ 423 } __attribute__((aligned(8))); 424 425 struct tcp_ao_info_opt { /* setsockopt(TCP_AO_INFO), getsockopt(TCP_AO_INFO) 426 */ 427 /* Here 'in' is for setsockopt(), 'out' is for getsockopt() */ 428 uint32_t set_current :1, /* In/out: corresponding ::current_key */ 429 set_rnext :1, /* In/out: corresponding ::rnext */ 430 ao_required :1, /* In/out: don't accept non-AO connects */ 431 set_counters :1, /* In: set/clear ::pkt_* counters */ 432 accept_icmps :1, /* In/out: accept incoming ICMPs */ 433 reserved :27; /* must be 0 */ 434 uint16_t reserved2; /* Padding, must be 0 */ 435 uint8_t current_key; /* In/out: KeyID of Current_key */ 436 uint8_t rnext; /* In/out: keyid of RNext_key */ 437 uint64_t pkt_good; /* In/out: verified segments */ 438 uint64_t pkt_bad; /* In/out: failed verification */ 439 uint64_t pkt_key_not_found; /* In/out: could not find a key to verify */ 440 uint64_t pkt_ao_required; /* In/out: segments missing TCP-AO sign */ 441 uint64_t pkt_dropped_icmp; /* In/out: ICMPs that were ignored */ 442 } __attribute__((aligned(8))); 443 444 struct tcp_ao_getsockopt { /* getsockopt(TCP_AO_GET_KEYS) */ 445 struct sockaddr_storage addr; /* In/out: dump keys for peer 446 * with this address/prefix 447 */ 448 uint8_t alg_name[64]; /* out: crypto hash algorithm */ 449 uint8_t key[TCP_AO_MAXKEYLEN]; 450 uint32_t nkeys; /* In: size of the userspace buffer 451 * @optval, measured in @optlen - the 452 * sizeof(struct tcp_ao_getsockopt) 453 * Out: number of keys that matched 454 */ 455 uint16_t is_current :1, /* In: match and dump Current_key, 456 * Out: the dumped key is Current_key 457 */ 458 is_rnext :1, /* In: match and dump RNext_key, 459 * Out: the dumped key is RNext_key 460 */ 461 get_all :1, /* In: dump all keys */ 462 reserved :13; /* Padding, must be 0 */ 463 uint8_t sndid; /* In/out: dump keys with SendID */ 464 uint8_t rcvid; /* In/out: dump keys with RecvID */ 465 uint8_t prefix; /* In/out: dump keys with address/prefix */ 466 uint8_t maclen; /* Out: key's length of authentication 467 * code (hash) 468 */ 469 uint8_t keyflags; /* In/out: see TCP_AO_KEYF_ */ 470 uint8_t keylen; /* Out: length of ::key */ 471 int32_t ifindex; /* In/out: L3 dev index for VRF */ 472 uint64_t pkt_good; /* Out: verified segments */ 473 uint64_t pkt_bad; /* Out: segments that failed verification */ 474 } __attribute__((aligned(8))); 475 476 struct tcp_ao_repair { /* {s,g}etsockopt(TCP_AO_REPAIR) */ 477 uint32_t snt_isn; 478 uint32_t rcv_isn; 479 uint32_t snd_sne; 480 uint32_t rcv_sne; 481 } __attribute__((aligned(8))); 482 483 /* For socket repair options. */ 484 struct tcp_repair_opt 485 { 486 uint32_t opt_code; 487 uint32_t opt_val; 488 }; 489 490 /* Queue to repair, for TCP_REPAIR_QUEUE. */ 491 enum 492 { 493 TCP_NO_QUEUE, 494 TCP_RECV_QUEUE, 495 TCP_SEND_QUEUE, 496 TCP_QUEUES_NR, 497 }; 498 499 /* For cookie transactions socket options. */ 500 #define TCP_COOKIE_MIN 8 /* 64-bits */ 501 #define TCP_COOKIE_MAX 16 /* 128-bits */ 502 #define TCP_COOKIE_PAIR_SIZE (2*TCP_COOKIE_MAX) 503 504 /* Flags for both getsockopt and setsockopt */ 505 #define TCP_COOKIE_IN_ALWAYS (1 << 0) /* Discard SYN without cookie */ 506 #define TCP_COOKIE_OUT_NEVER (1 << 1) /* Prohibit outgoing cookies, 507 * supersedes everything. */ 508 509 /* Flags for getsockopt */ 510 #define TCP_S_DATA_IN (1 << 2) /* Was data received? */ 511 #define TCP_S_DATA_OUT (1 << 3) /* Was data sent? */ 512 513 #define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */ 514 #define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */ 515 516 struct tcp_cookie_transactions 517 { 518 uint16_t tcpct_flags; 519 uint8_t __tcpct_pad1; 520 uint8_t tcpct_cookie_desired; 521 uint16_t tcpct_s_data_desired; 522 uint16_t tcpct_used; 523 uint8_t tcpct_value[TCP_MSS_DEFAULT]; 524 }; 525 526 /* For use with TCP_REPAIR_WINDOW. */ 527 struct tcp_repair_window 528 { 529 uint32_t snd_wl1; 530 uint32_t snd_wnd; 531 uint32_t max_window; 532 uint32_t rcv_wnd; 533 uint32_t rcv_wup; 534 }; 535 536 /* For use with TCP_ZEROCOPY_RECEIVE. */ 537 struct tcp_zerocopy_receive 538 { 539 uint64_t address; /* In: address of mapping. */ 540 uint32_t length; /* In/out: number of bytes to map/mapped. */ 541 uint32_t recv_skip_hint; /* Out: amount of bytes to skip. */ 542 uint32_t inq; /* Out: amount of bytes in read queue. */ 543 int32_t err; /* Out: socket error. */ 544 uint64_t copybuf_address; /* On: copybuf address (small reads). */ 545 int32_t copybuf_len; /* In/Out: copybuf bytes avail/used or error. */ 546 uint32_t flags; /* In: flags. */ 547 uint64_t msg_control; /* Ancillary data. */ 548 uint64_t msg_controllen; 549 uint32_t msg_flags; 550 uint32_t reserved; /* Set to 0 for now. */ 551 }; 552 553 #endif /* Misc. */ 554 555 #endif /* netinet/tcp.h */
