1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993, 1994, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 32 * $FreeBSD$ 33 */ 34 35 #ifndef _NETINET_TCP_VAR_H_ 36 #define _NETINET_TCP_VAR_H_ 37 38 #include <netinet/tcp.h> 39 #include <netinet/tcp_fsm.h> 40 41 #ifdef _KERNEL 42 #include <net/vnet.h> 43 #include <sys/mbuf.h> 44 #endif 45 46 #if defined(_KERNEL) || defined(_WANT_TCPCB) 47 /* TCP segment queue entry */ 48 struct tseg_qent { 49 TAILQ_ENTRY(tseg_qent) tqe_q; 50 struct mbuf *tqe_m; /* mbuf contains packet */ 51 struct mbuf *tqe_last; /* last mbuf in chain */ 52 tcp_seq tqe_start; /* TCP Sequence number start */ 53 int tqe_len; /* TCP segment data length */ 54 uint32_t tqe_flags; /* The flags from the th->th_flags */ 55 uint32_t tqe_mbuf_cnt; /* Count of mbuf overhead */ 56 }; 57 TAILQ_HEAD(tsegqe_head, tseg_qent); 58 59 struct sackblk { 60 tcp_seq start; /* start seq no. of sack block */ 61 tcp_seq end; /* end seq no. */ 62 }; 63 64 struct sackhole { 65 tcp_seq start; /* start seq no. of hole */ 66 tcp_seq end; /* end seq no. */ 67 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 68 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 69 }; 70 71 struct sackhint { 72 struct sackhole *nexthole; 73 int sack_bytes_rexmit; 74 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */ 75 76 int ispare; /* explicit pad for 64bit alignment */ 77 int sacked_bytes; /* 78 * Total sacked bytes reported by the 79 * receiver via sack option 80 */ 81 uint32_t _pad1[1]; /* TBD */ 82 uint64_t _pad[1]; /* TBD */ 83 }; 84 85 #define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq) 86 87 STAILQ_HEAD(tcp_log_stailq, tcp_log_mem); 88 89 /* 90 * Tcp control block, one per tcp; fields: 91 * Organized for 64 byte cacheline efficiency based 92 * on common tcp_input/tcp_output processing. 93 */ 94 struct tcpcb { 95 /* Cache line 1 */ 96 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 97 struct tcp_function_block *t_fb;/* TCP function call block */ 98 void *t_fb_ptr; /* Pointer to t_fb specific data */ 99 uint32_t t_maxseg:24, /* maximum segment size */ 100 t_logstate:8; /* State of "black box" logging */ 101 uint32_t t_port:16, /* Tunneling (over udp) port */ 102 t_state:4, /* state of this connection */ 103 t_idle_reduce : 1, 104 t_delayed_ack: 7, /* Delayed ack variable */ 105 bits_spare : 4; 106 u_int t_flags; 107 tcp_seq snd_una; /* sent but unacknowledged */ 108 tcp_seq snd_max; /* highest sequence number sent; 109 * used to recognize retransmits 110 */ 111 tcp_seq snd_nxt; /* send next */ 112 tcp_seq snd_up; /* send urgent pointer */ 113 uint32_t snd_wnd; /* send window */ 114 uint32_t snd_cwnd; /* congestion-controlled window */ 115 uint32_t t_peakrate_thr; /* pre-calculated peak rate threshold */ 116 /* Cache line 2 */ 117 u_int32_t ts_offset; /* our timestamp offset */ 118 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 119 int rcv_numsacks; /* # distinct sack blks present */ 120 u_int t_tsomax; /* TSO total burst length limit in bytes */ 121 u_int t_tsomaxsegcount; /* TSO maximum segment count */ 122 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */ 123 tcp_seq rcv_nxt; /* receive next */ 124 tcp_seq rcv_adv; /* advertised window */ 125 uint32_t rcv_wnd; /* receive window */ 126 u_int t_flags2; /* More tcpcb flags storage */ 127 int t_srtt; /* smoothed round-trip time */ 128 int t_rttvar; /* variance in round-trip time */ 129 u_int32_t ts_recent; /* timestamp echo data */ 130 u_char snd_scale; /* window scaling for send window */ 131 u_char rcv_scale; /* window scaling for recv window */ 132 u_char snd_limited; /* segments limited transmitted */ 133 u_char request_r_scale; /* pending window scaling */ 134 tcp_seq last_ack_sent; 135 u_int t_rcvtime; /* inactivity time */ 136 /* Cache line 3 */ 137 tcp_seq rcv_up; /* receive urgent pointer */ 138 int t_segqlen; /* segment reassembly queue length */ 139 uint32_t t_segqmbuflen; /* Count of bytes mbufs on all entries */ 140 struct tsegqe_head t_segq; /* segment reassembly queue */ 141 struct mbuf *t_in_pkt; 142 struct mbuf *t_tail_pkt; 143 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 144 struct vnet *t_vnet; /* back pointer to parent vnet */ 145 uint32_t snd_ssthresh; /* snd_cwnd size threshold for 146 * for slow start exponential to 147 * linear switch 148 */ 149 tcp_seq snd_wl1; /* window update seg seq number */ 150 /* Cache line 4 */ 151 tcp_seq snd_wl2; /* window update seg ack number */ 152 153 tcp_seq irs; /* initial receive sequence number */ 154 tcp_seq iss; /* initial send sequence number */ 155 u_int t_acktime; 156 u_int ts_recent_age; /* when last updated */ 157 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 158 uint16_t cl4_spare; /* Spare to adjust CL 4 */ 159 char t_oobflags; /* have some */ 160 char t_iobc; /* input character */ 161 int t_rxtcur; /* current retransmit value (ticks) */ 162 163 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 164 u_int t_rtttime; /* RTT measurement start time */ 165 166 tcp_seq t_rtseq; /* sequence number being timed */ 167 u_int t_starttime; /* time connection was established */ 168 169 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */ 170 u_int t_rttmin; /* minimum rtt allowed */ 171 172 u_int t_rttbest; /* best rtt we've seen */ 173 174 int t_softerror; /* possible error not yet reported */ 175 uint32_t max_sndwnd; /* largest window peer has offered */ 176 /* Cache line 5 */ 177 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */ 178 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ 179 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 180 int t_sndzerowin; /* zero-window updates sent */ 181 u_long t_rttupdated; /* number of times rtt sampled */ 182 int snd_numholes; /* number of holes seen by sender */ 183 u_int t_badrxtwin; /* window for retransmit recovery */ 184 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 185 /* SACK scoreboard (sorted) */ 186 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 187 tcp_seq sack_newdata; /* New data xmitted in this recovery 188 episode starts at this seq number */ 189 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 190 struct sackhint sackhint; /* SACK scoreboard hint */ 191 int t_rttlow; /* smallest observerved RTT */ 192 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 193 struct toedev *tod; /* toedev handling this connection */ 194 int t_sndrexmitpack; /* retransmit packets sent */ 195 int t_rcvoopack; /* out-of-order packets received */ 196 void *t_toe; /* TOE pcb pointer */ 197 struct cc_algo *cc_algo; /* congestion control algorithm */ 198 struct cc_var *ccv; /* congestion control specific vars */ 199 struct osd *osd; /* storage for Khelp module data */ 200 int t_bytes_acked; /* # bytes acked during current RTT */ 201 u_int t_maxunacktime; 202 u_int t_keepinit; /* time to establish connection */ 203 u_int t_keepidle; /* time before keepalive probes begin */ 204 u_int t_keepintvl; /* interval between keepalives */ 205 u_int t_keepcnt; /* number of keepalives before close */ 206 int t_dupacks; /* consecutive dup acks recd */ 207 int t_lognum; /* Number of log entries */ 208 struct tcp_log_stailq t_logs; /* Log buffer */ 209 struct tcp_log_id_node *t_lin; 210 struct tcp_log_id_bucket *t_lib; 211 const char *t_output_caller; /* Function that called tcp_output */ 212 uint32_t t_logsn; /* Log "serial number" */ 213 uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */ 214 unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */ 215 union { 216 uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN]; 217 uint64_t server; 218 } t_tfo_cookie; /* TCP Fast Open cookie to send */ 219 #ifdef TCPPCAP 220 struct mbufq t_inpkts; /* List of saved input packets. */ 221 struct mbufq t_outpkts; /* List of saved output packets. */ 222 #endif 223 }; 224 #endif /* _KERNEL || _WANT_TCPCB */ 225 226 #ifdef _KERNEL 227 struct tcptemp { 228 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 229 struct tcphdr tt_t; 230 }; 231 232 /* 233 * TODO: We yet need to brave plowing in 234 * to tcp_input() and the pru_usrreq() block. 235 * Right now these go to the old standards which 236 * are somewhat ok, but in the long term may 237 * need to be changed. If we do tackle tcp_input() 238 * then we need to get rid of the tcp_do_segment() 239 * function below. 240 */ 241 /* Flags for tcp functions */ 242 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */ 243 244 /* 245 * If defining the optional tcp_timers, in the 246 * tfb_tcp_timer_stop call you must use the 247 * callout_async_drain() function with the 248 * tcp_timer_discard callback. You should check 249 * the return of callout_async_drain() and if 0 250 * increment tt_draincnt. Since the timer sub-system 251 * does not know your callbacks you must provide a 252 * stop_all function that loops through and calls 253 * tcp_timer_stop() with each of your defined timers. 254 * Adding a tfb_tcp_handoff_ok function allows the socket 255 * option to change stacks to query you even if the 256 * connection is in a later stage. You return 0 to 257 * say you can take over and run your stack, you return 258 * non-zero (an error number) to say no you can't. 259 * If the function is undefined you can only change 260 * in the early states (before connect or listen). 261 * tfb_tcp_fb_fini is changed to add a flag to tell 262 * the old stack if the tcb is being destroyed or 263 * not. A one in the flag means the TCB is being 264 * destroyed, a zero indicates its transitioning to 265 * another stack (via socket option). 266 */ 267 struct tcp_function_block { 268 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX]; 269 int (*tfb_tcp_output)(struct tcpcb *); 270 int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *); 271 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *, 272 struct socket *, struct tcpcb *, 273 int, int, uint8_t); 274 void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *, 275 struct socket *, struct tcpcb *, 276 int, int, uint8_t, 277 int, struct timeval *); 278 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt, 279 struct inpcb *inp, struct tcpcb *tp); 280 /* Optional memory allocation/free routine */ 281 int (*tfb_tcp_fb_init)(struct tcpcb *); 282 void (*tfb_tcp_fb_fini)(struct tcpcb *, int); 283 /* Optional timers, must define all if you define one */ 284 int (*tfb_tcp_timer_stop_all)(struct tcpcb *); 285 void (*tfb_tcp_timer_activate)(struct tcpcb *, 286 uint32_t, u_int); 287 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t); 288 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t); 289 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *); 290 int (*tfb_tcp_handoff_ok)(struct tcpcb *); 291 void (*tfb_tcp_mtu_chg)(struct tcpcb *); 292 volatile uint32_t tfb_refcnt; 293 uint32_t tfb_flags; 294 uint8_t tfb_id; 295 }; 296 297 struct tcp_function { 298 TAILQ_ENTRY(tcp_function) tf_next; 299 char tf_name[TCP_FUNCTION_NAME_LEN_MAX]; 300 struct tcp_function_block *tf_fb; 301 }; 302 303 TAILQ_HEAD(tcp_funchead, tcp_function); 304 #endif /* _KERNEL */ 305 306 /* 307 * Flags and utility macros for the t_flags field. 308 */ 309 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 310 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 311 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 312 #define TF_NOOPT 0x000008 /* don't use tcp options */ 313 #define TF_SENTFIN 0x000010 /* have sent FIN */ 314 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 315 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 316 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 317 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 318 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 319 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 320 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 321 #define TF_NOPUSH 0x001000 /* don't push */ 322 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */ 323 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 324 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 325 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 326 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 327 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 328 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 329 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 330 #define TF_FORCEDATA 0x800000 /* force out a byte */ 331 #define TF_TSO 0x1000000 /* TSO enabled on this connection */ 332 #define TF_TOE 0x2000000 /* this connection is offloaded */ 333 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 334 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 335 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 336 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 337 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 338 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */ 339 340 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 341 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 342 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 343 344 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 345 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 346 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 347 348 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 349 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 350 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 351 352 #if defined(_KERNEL) && !defined(TCP_RFC7413) 353 #define IS_FASTOPEN(t_flags) (false) 354 #else 355 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN) 356 #endif 357 358 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 359 360 /* 361 * Flags for the t_oobflags field. 362 */ 363 #define TCPOOB_HAVEDATA 0x01 364 #define TCPOOB_HADDATA 0x02 365 366 /* 367 * Flags for the extended TCP flags field, t_flags2 368 */ 369 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */ 370 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */ 371 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */ 372 #define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */ 373 #define TF2_DROP_AF_DATA 0x00000010 /* Drop after all data ack'd */ 374 375 /* 376 * Structure to hold TCP options that are only used during segment 377 * processing (in tcp_input), but not held in the tcpcb. 378 * It's basically used to reduce the number of parameters 379 * to tcp_dooptions and tcp_addoptions. 380 * The binary order of the to_flags is relevant for packing of the 381 * options in tcp_addoptions. 382 */ 383 struct tcpopt { 384 u_int32_t to_flags; /* which options are present */ 385 #define TOF_MSS 0x0001 /* maximum segment size */ 386 #define TOF_SCALE 0x0002 /* window scaling */ 387 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 388 #define TOF_TS 0x0010 /* timestamp */ 389 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 390 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 391 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */ 392 #define TOF_MAXOPT 0x0200 393 u_int32_t to_tsval; /* new timestamp */ 394 u_int32_t to_tsecr; /* reflected timestamp */ 395 u_char *to_sacks; /* pointer to the first SACK blocks */ 396 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 397 u_int8_t *to_tfo_cookie; /* pointer to the TFO cookie */ 398 u_int16_t to_mss; /* maximum segment size */ 399 u_int8_t to_wscale; /* window scaling */ 400 u_int8_t to_nsacks; /* number of SACK blocks */ 401 u_int8_t to_tfo_len; /* TFO cookie length */ 402 u_int32_t to_spare; /* UTO */ 403 }; 404 405 /* 406 * Flags for tcp_dooptions. 407 */ 408 #define TO_SYN 0x01 /* parse SYN-only options */ 409 410 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 411 uint32_t rmx_mtu; /* MTU for this path */ 412 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */ 413 uint32_t rmx_rtt; /* estimated round trip time */ 414 uint32_t rmx_rttvar; /* estimated rtt variance */ 415 uint32_t rmx_cwnd; /* congestion window */ 416 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */ 417 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */ 418 }; 419 420 /* 421 * Used by tcp_maxmtu() to communicate interface specific features 422 * and limits at the time of connection setup. 423 */ 424 struct tcp_ifcap { 425 int ifcap; 426 u_int tsomax; 427 u_int tsomaxsegcount; 428 u_int tsomaxsegsize; 429 }; 430 431 #ifndef _NETINET_IN_PCB_H_ 432 struct in_conninfo; 433 #endif /* _NETINET_IN_PCB_H_ */ 434 435 struct tcptw { 436 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 437 tcp_seq snd_nxt; 438 tcp_seq rcv_nxt; 439 tcp_seq iss; 440 tcp_seq irs; 441 u_short last_win; /* cached window value */ 442 short tw_so_options; /* copy of so_options */ 443 struct ucred *tw_cred; /* user credentials */ 444 u_int32_t t_recent; 445 u_int32_t ts_offset; /* our timestamp offset */ 446 u_int t_starttime; 447 int tw_time; 448 TAILQ_ENTRY(tcptw) tw_2msl; 449 void *tw_pspare; /* TCP_SIGNATURE */ 450 u_int *tw_spare; /* TCP_SIGNATURE */ 451 }; 452 453 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 454 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 455 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 456 457 /* 458 * The smoothed round-trip time and estimated variance 459 * are stored as fixed point numbers scaled by the values below. 460 * For convenience, these scales are also used in smoothing the average 461 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 462 * With these scales, srtt has 3 bits to the right of the binary point, 463 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 464 * binary point, and is smoothed with an ALPHA of 0.75. 465 */ 466 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 467 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 468 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 469 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 470 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 471 472 /* 473 * The initial retransmission should happen at rtt + 4 * rttvar. 474 * Because of the way we do the smoothing, srtt and rttvar 475 * will each average +1/2 tick of bias. When we compute 476 * the retransmit timer, we want 1/2 tick of rounding and 477 * 1 extra tick because of +-1/2 tick uncertainty in the 478 * firing of the timer. The bias will give us exactly the 479 * 1.5 tick we need. But, because the bias is 480 * statistical, we have to test that we don't drop below 481 * the minimum feasible timer (which is 2 ticks). 482 * This version of the macro adapted from a paper by Lawrence 483 * Brakmo and Larry Peterson which outlines a problem caused 484 * by insufficient precision in the original implementation, 485 * which results in inappropriately large RTO values for very 486 * fast networks. 487 */ 488 #define TCP_REXMTVAL(tp) \ 489 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 490 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 491 492 /* 493 * TCP statistics. 494 * Many of these should be kept per connection, 495 * but that's inconvenient at the moment. 496 */ 497 struct tcpstat { 498 uint64_t tcps_connattempt; /* connections initiated */ 499 uint64_t tcps_accepts; /* connections accepted */ 500 uint64_t tcps_connects; /* connections established */ 501 uint64_t tcps_drops; /* connections dropped */ 502 uint64_t tcps_conndrops; /* embryonic connections dropped */ 503 uint64_t tcps_minmssdrops; /* average minmss too low drops */ 504 uint64_t tcps_closed; /* conn. closed (includes drops) */ 505 uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 506 uint64_t tcps_rttupdated; /* times we succeeded */ 507 uint64_t tcps_delack; /* delayed acks sent */ 508 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 509 uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 510 uint64_t tcps_persisttimeo; /* persist timeouts */ 511 uint64_t tcps_keeptimeo; /* keepalive timeouts */ 512 uint64_t tcps_keepprobe; /* keepalive probes sent */ 513 uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 514 515 uint64_t tcps_sndtotal; /* total packets sent */ 516 uint64_t tcps_sndpack; /* data packets sent */ 517 uint64_t tcps_sndbyte; /* data bytes sent */ 518 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 519 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 520 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 521 uint64_t tcps_sndacks; /* ack-only packets sent */ 522 uint64_t tcps_sndprobe; /* window probes sent */ 523 uint64_t tcps_sndurg; /* packets sent with URG only */ 524 uint64_t tcps_sndwinup; /* window update-only packets sent */ 525 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 526 527 uint64_t tcps_rcvtotal; /* total packets received */ 528 uint64_t tcps_rcvpack; /* packets received in sequence */ 529 uint64_t tcps_rcvbyte; /* bytes received in sequence */ 530 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 531 uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 532 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */ 533 uint64_t tcps_rcvshort; /* packets received too short */ 534 uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 535 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 536 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 537 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 538 uint64_t tcps_rcvoopack; /* out-of-order packets received */ 539 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 540 uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 541 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 542 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 543 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 544 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 545 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 546 uint64_t tcps_rcvackpack; /* rcvd ack packets */ 547 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 548 uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 549 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 550 uint64_t tcps_predack; /* times hdr predict ok for acks */ 551 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 552 uint64_t tcps_pcbcachemiss; 553 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 554 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 555 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 556 uint64_t tcps_usedrtt; /* times RTT initialized from route */ 557 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 558 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 559 uint64_t tcps_persistdrop; /* timeout in persist state */ 560 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 561 uint64_t tcps_mturesent; /* resends due to MTU discovery */ 562 uint64_t tcps_listendrop; /* listen queue overflows */ 563 uint64_t tcps_badrst; /* ignored RSTs in the window */ 564 565 uint64_t tcps_sc_added; /* entry added to syncache */ 566 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 567 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 568 uint64_t tcps_sc_dropped; /* could not reply to packet */ 569 uint64_t tcps_sc_completed; /* successful extraction of entry */ 570 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 571 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 572 uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 573 uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 574 uint64_t tcps_sc_aborted; /* syncache entry aborted */ 575 uint64_t tcps_sc_badack; /* removed due to bad ACK */ 576 uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 577 uint64_t tcps_sc_zonefail; /* zalloc() failed */ 578 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 579 uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 580 581 uint64_t tcps_hc_added; /* entry added to hostcache */ 582 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 583 584 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 585 586 /* SACK related stats */ 587 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 588 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 589 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 590 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 591 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 592 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 593 594 /* ECN related stats */ 595 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */ 596 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */ 597 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */ 598 uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 599 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 600 601 /* TCP_SIGNATURE related stats */ 602 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 603 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 604 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */ 605 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 606 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 607 608 /* Path MTU Discovery Black Hole Detection related stats */ 609 uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */ 610 uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */ 611 uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */ 612 613 uint64_t _pad[12]; /* 6 UTO, 6 TBD */ 614 }; 615 616 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */ 617 618 #ifdef _KERNEL 619 #define TI_UNLOCKED 1 620 #define TI_RLOCKED 2 621 #include <sys/counter.h> 622 623 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 624 /* 625 * In-kernel consumers can use these accessor macros directly to update 626 * stats. 627 */ 628 #define TCPSTAT_ADD(name, val) \ 629 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val)) 630 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 631 632 /* 633 * Kernel module consumers must use this accessor macro. 634 */ 635 void kmod_tcpstat_inc(int statnum); 636 #define KMOD_TCPSTAT_INC(name) \ 637 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t)) 638 639 /* 640 * Running TCP connection count by state. 641 */ 642 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]); 643 #define V_tcps_states VNET(tcps_states) 644 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1) 645 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1) 646 647 /* 648 * TCP specific helper hook point identifiers. 649 */ 650 #define HHOOK_TCP_EST_IN 0 651 #define HHOOK_TCP_EST_OUT 1 652 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 653 654 struct tcp_hhook_data { 655 struct tcpcb *tp; 656 struct tcphdr *th; 657 struct tcpopt *to; 658 uint32_t len; 659 int tso; 660 tcp_seq curack; 661 }; 662 #ifdef TCP_HHOOK 663 void hhook_run_tcp_est_out(struct tcpcb *tp, 664 struct tcphdr *th, struct tcpopt *to, 665 uint32_t len, int tso); 666 #endif 667 #endif 668 669 /* 670 * TCB structure exported to user-land via sysctl(3). 671 * 672 * Fields prefixed with "xt_" are unique to the export structure, and fields 673 * with "t_" or other prefixes match corresponding fields of 'struct tcpcb'. 674 * 675 * Legend: 676 * (s) - used by userland utilities in src 677 * (p) - used by utilities in ports 678 * (3) - is known to be used by third party software not in ports 679 * (n) - no known usage 680 * 681 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 682 * included. Not all of our clients do. 683 */ 684 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 685 struct xtcpcb { 686 ksize_t xt_len; /* length of this structure */ 687 struct xinpcb xt_inp; 688 char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */ 689 char xt_logid[TCP_LOG_ID_LEN]; /* (s) */ 690 int64_t spare64[8]; 691 int32_t t_state; /* (s,p) */ 692 uint32_t t_flags; /* (s,p) */ 693 int32_t t_sndzerowin; /* (s) */ 694 int32_t t_sndrexmitpack; /* (s) */ 695 int32_t t_rcvoopack; /* (s) */ 696 int32_t t_rcvtime; /* (s) */ 697 int32_t tt_rexmt; /* (s) */ 698 int32_t tt_persist; /* (s) */ 699 int32_t tt_keep; /* (s) */ 700 int32_t tt_2msl; /* (s) */ 701 int32_t tt_delack; /* (s) */ 702 int32_t t_logstate; /* (3) */ 703 int32_t spare32[32]; 704 } __aligned(8); 705 706 #ifdef _KERNEL 707 void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *); 708 #endif 709 #endif 710 711 /* 712 * TCP function information (name-to-id mapping, aliases, and refcnt) 713 * exported to user-land via sysctl(3). 714 */ 715 struct tcp_function_info { 716 uint32_t tfi_refcnt; 717 uint8_t tfi_id; 718 char tfi_name[TCP_FUNCTION_NAME_LEN_MAX]; 719 char tfi_alias[TCP_FUNCTION_NAME_LEN_MAX]; 720 }; 721 722 /* 723 * Identifiers for TCP sysctl nodes 724 */ 725 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 726 #define TCPCTL_MSSDFLT 3 /* MSS default */ 727 #define TCPCTL_STATS 4 /* statistics */ 728 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 729 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 730 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 731 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 732 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 733 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 734 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 735 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 736 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 737 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 738 #define TCPCTL_DROP 15 /* drop tcp connection */ 739 #define TCPCTL_STATES 16 /* connection counts by TCP state */ 740 741 #ifdef _KERNEL 742 #ifdef SYSCTL_DECL 743 SYSCTL_DECL(_net_inet_tcp); 744 SYSCTL_DECL(_net_inet_tcp_sack); 745 MALLOC_DECLARE(M_TCPLOG); 746 #endif 747 748 extern int tcp_log_in_vain; 749 750 /* 751 * Global TCP tunables shared between different stacks. 752 * Please keep the list sorted. 753 */ 754 VNET_DECLARE(int, drop_synfin); 755 VNET_DECLARE(int, path_mtu_discovery); 756 VNET_DECLARE(int, tcp_abc_l_var); 757 VNET_DECLARE(int, tcp_autorcvbuf_inc); 758 VNET_DECLARE(int, tcp_autorcvbuf_max); 759 VNET_DECLARE(int, tcp_autosndbuf_inc); 760 VNET_DECLARE(int, tcp_autosndbuf_max); 761 VNET_DECLARE(int, tcp_delack_enabled); 762 VNET_DECLARE(int, tcp_do_autorcvbuf); 763 VNET_DECLARE(int, tcp_do_autosndbuf); 764 VNET_DECLARE(int, tcp_do_ecn); 765 VNET_DECLARE(int, tcp_do_rfc1323); 766 VNET_DECLARE(int, tcp_do_rfc3042); 767 VNET_DECLARE(int, tcp_do_rfc3390); 768 VNET_DECLARE(int, tcp_do_rfc3465); 769 VNET_DECLARE(int, tcp_do_rfc6675_pipe); 770 VNET_DECLARE(int, tcp_do_sack); 771 VNET_DECLARE(int, tcp_do_tso); 772 VNET_DECLARE(int, tcp_ecn_maxretries); 773 VNET_DECLARE(int, tcp_initcwnd_segments); 774 VNET_DECLARE(int, tcp_insecure_rst); 775 VNET_DECLARE(int, tcp_insecure_syn); 776 VNET_DECLARE(int, tcp_minmss); 777 VNET_DECLARE(int, tcp_mssdflt); 778 VNET_DECLARE(int, tcp_recvspace); 779 VNET_DECLARE(int, tcp_sack_globalholes); 780 VNET_DECLARE(int, tcp_sack_globalmaxholes); 781 VNET_DECLARE(int, tcp_sack_maxholes); 782 VNET_DECLARE(int, tcp_sc_rst_sock_fail); 783 VNET_DECLARE(int, tcp_sendspace); 784 VNET_DECLARE(struct inpcbhead, tcb); 785 VNET_DECLARE(struct inpcbinfo, tcbinfo); 786 787 #define V_drop_synfin VNET(drop_synfin) 788 #define V_path_mtu_discovery VNET(path_mtu_discovery) 789 #define V_tcb VNET(tcb) 790 #define V_tcbinfo VNET(tcbinfo) 791 #define V_tcp_abc_l_var VNET(tcp_abc_l_var) 792 #define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc) 793 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max) 794 #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc) 795 #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max) 796 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 797 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf) 798 #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf) 799 #define V_tcp_do_ecn VNET(tcp_do_ecn) 800 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 801 #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042) 802 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 803 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 804 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe) 805 #define V_tcp_do_sack VNET(tcp_do_sack) 806 #define V_tcp_do_tso VNET(tcp_do_tso) 807 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 808 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments) 809 #define V_tcp_insecure_rst VNET(tcp_insecure_rst) 810 #define V_tcp_insecure_syn VNET(tcp_insecure_syn) 811 #define V_tcp_minmss VNET(tcp_minmss) 812 #define V_tcp_mssdflt VNET(tcp_mssdflt) 813 #define V_tcp_recvspace VNET(tcp_recvspace) 814 #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes) 815 #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes) 816 #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes) 817 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 818 #define V_tcp_sendspace VNET(tcp_sendspace) 819 #define V_tcp_udp_tunneling_overhead VNET(tcp_udp_tunneling_overhead) 820 #define V_tcp_udp_tunneling_port VNET(tcp_udp_tunneling_port) 821 822 823 #ifdef TCP_HHOOK 824 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 825 #define V_tcp_hhh VNET(tcp_hhh) 826 #endif 827 828 int tcp_addoptions(struct tcpopt *, u_char *); 829 int tcp_ccalgounload(struct cc_algo *unload_algo); 830 struct tcpcb * 831 tcp_close(struct tcpcb *); 832 void tcp_discardcb(struct tcpcb *); 833 void tcp_twstart(struct tcpcb *); 834 void tcp_twclose(struct tcptw *, int); 835 void tcp_ctlinput(int, struct sockaddr *, void *); 836 int tcp_ctloutput(struct socket *, struct sockopt *); 837 struct tcpcb * 838 tcp_drop(struct tcpcb *, int); 839 void tcp_drain(void); 840 void tcp_init(void); 841 void tcp_fini(void *); 842 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 843 const void *); 844 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 845 const void *); 846 int tcp_reass(struct tcpcb *, struct tcphdr *, tcp_seq *, int *, struct mbuf *); 847 void tcp_reass_global_init(void); 848 void tcp_reass_flush(struct tcpcb *); 849 void tcp_dooptions(struct tcpopt *, u_char *, int, int); 850 void tcp_dropwithreset(struct mbuf *, struct tcphdr *, 851 struct tcpcb *, int, int); 852 void tcp_pulloutofband(struct socket *, 853 struct tcphdr *, struct mbuf *, int); 854 void tcp_xmit_timer(struct tcpcb *, int); 855 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *); 856 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th, 857 uint16_t nsegs, uint16_t type); 858 void cc_conn_init(struct tcpcb *tp); 859 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th); 860 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 861 #ifdef TCP_HHOOK 862 void hhook_run_tcp_est_in(struct tcpcb *tp, 863 struct tcphdr *th, struct tcpopt *to); 864 #endif 865 866 int tcp_input(struct mbuf **, int *, int); 867 int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *, 868 struct tcpcb *, int); 869 void tcp_do_segment(struct mbuf *, struct tcphdr *, 870 struct socket *, struct tcpcb *, int, int, uint8_t); 871 872 int register_tcp_functions(struct tcp_function_block *blk, int wait); 873 int register_tcp_functions_as_names(struct tcp_function_block *blk, 874 int wait, const char *names[], int *num_names); 875 int register_tcp_functions_as_name(struct tcp_function_block *blk, 876 const char *name, int wait); 877 int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce, 878 bool force); 879 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs); 880 void tcp_switch_back_to_default(struct tcpcb *tp); 881 struct tcp_function_block * 882 find_and_ref_tcp_fb(struct tcp_function_block *fs); 883 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp); 884 885 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 886 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 887 u_int tcp_maxseg(const struct tcpcb *); 888 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 889 struct tcp_ifcap *); 890 void tcp_mss(struct tcpcb *, int); 891 int tcp_mssopt(struct in_conninfo *); 892 struct inpcb * 893 tcp_drop_syn_sent(struct inpcb *, int); 894 struct tcpcb * 895 tcp_newtcpcb(struct inpcb *); 896 int tcp_output(struct tcpcb *); 897 void tcp_state_change(struct tcpcb *, int); 898 void tcp_respond(struct tcpcb *, void *, 899 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 900 void tcp_tw_init(void); 901 #ifdef VIMAGE 902 void tcp_tw_destroy(void); 903 #endif 904 void tcp_tw_zone_change(void); 905 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 906 struct mbuf *, int); 907 void tcp_setpersist(struct tcpcb *); 908 void tcp_slowtimo(void); 909 struct tcptemp * 910 tcpip_maketemplate(struct inpcb *); 911 void tcpip_fillheaders(struct inpcb *, void *, void *); 912 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int); 913 int tcp_timer_suspend(struct tcpcb *, uint32_t); 914 void tcp_timers_unsuspend(struct tcpcb *, uint32_t); 915 int tcp_timer_active(struct tcpcb *, uint32_t); 916 void tcp_timer_stop(struct tcpcb *, uint32_t); 917 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 918 int inp_to_cpuid(struct inpcb *inp); 919 /* 920 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 921 */ 922 void tcp_hc_init(void); 923 #ifdef VIMAGE 924 void tcp_hc_destroy(void); 925 #endif 926 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 927 uint32_t tcp_hc_getmtu(struct in_conninfo *); 928 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t); 929 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 930 931 extern struct pr_usrreqs tcp_usrreqs; 932 933 uint32_t tcp_new_ts_offset(struct in_conninfo *); 934 tcp_seq tcp_new_isn(struct in_conninfo *); 935 936 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 937 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 938 void tcp_clean_sackreport(struct tcpcb *tp); 939 void tcp_sack_adjust(struct tcpcb *tp); 940 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 941 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 942 void tcp_free_sackholes(struct tcpcb *tp); 943 int tcp_newreno(struct tcpcb *, struct tcphdr *); 944 int tcp_compute_pipe(struct tcpcb *); 945 uint32_t tcp_compute_initwnd(uint32_t); 946 void tcp_sndbuf_autoscale(struct tcpcb *, struct socket *, uint32_t); 947 struct mbuf * 948 tcp_m_copym(struct mbuf *m, int32_t off0, int32_t *plen, 949 int32_t seglimit, int32_t segsize, struct sockbuf *sb); 950 951 952 static inline void 953 tcp_fields_to_host(struct tcphdr *th) 954 { 955 956 th->th_seq = ntohl(th->th_seq); 957 th->th_ack = ntohl(th->th_ack); 958 th->th_win = ntohs(th->th_win); 959 th->th_urp = ntohs(th->th_urp); 960 } 961 962 static inline void 963 tcp_fields_to_net(struct tcphdr *th) 964 { 965 966 th->th_seq = htonl(th->th_seq); 967 th->th_ack = htonl(th->th_ack); 968 th->th_win = htons(th->th_win); 969 th->th_urp = htons(th->th_urp); 970 } 971 #endif /* _KERNEL */ 972 973 #endif /* _NETINET_TCP_VAR_H_ */ 974