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 LIST_ENTRY(tseg_qent) tqe_q; 50 int tqe_len; /* TCP segment data length */ 51 struct tcphdr *tqe_th; /* a pointer to tcp header */ 52 struct mbuf *tqe_m; /* mbuf contains packet */ 53 }; 54 LIST_HEAD(tsegqe_head, tseg_qent); 55 56 struct sackblk { 57 tcp_seq start; /* start seq no. of sack block */ 58 tcp_seq end; /* end seq no. */ 59 }; 60 61 struct sackhole { 62 tcp_seq start; /* start seq no. of hole */ 63 tcp_seq end; /* end seq no. */ 64 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 65 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 66 }; 67 68 struct sackhint { 69 struct sackhole *nexthole; 70 int sack_bytes_rexmit; 71 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */ 72 73 int ispare; /* explicit pad for 64bit alignment */ 74 int sacked_bytes; /* 75 * Total sacked bytes reported by the 76 * receiver via sack option 77 */ 78 uint32_t _pad1[1]; /* TBD */ 79 uint64_t _pad[1]; /* TBD */ 80 }; 81 82 STAILQ_HEAD(tcp_log_stailq, tcp_log_mem); 83 84 /* 85 * Tcp control block, one per tcp; fields: 86 * Organized for 64 byte cacheline efficiency based 87 * on common tcp_input/tcp_output processing. 88 */ 89 struct tcpcb { 90 /* Cache line 1 */ 91 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 92 struct tcp_function_block *t_fb;/* TCP function call block */ 93 void *t_fb_ptr; /* Pointer to t_fb specific data */ 94 uint32_t t_maxseg:24, /* maximum segment size */ 95 t_logstate:8; /* State of "black box" logging */ 96 uint32_t t_state:4, /* state of this connection */ 97 bits_spare : 24; 98 u_int t_flags; 99 tcp_seq snd_una; /* sent but unacknowledged */ 100 tcp_seq snd_max; /* highest sequence number sent; 101 * used to recognize retransmits 102 */ 103 tcp_seq snd_nxt; /* send next */ 104 tcp_seq snd_up; /* send urgent pointer */ 105 uint32_t snd_wnd; /* send window */ 106 uint32_t snd_cwnd; /* congestion-controlled window */ 107 uint32_t cl1_spare; /* Spare to round out CL 1 */ 108 /* Cache line 2 */ 109 u_int32_t ts_offset; /* our timestamp offset */ 110 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 111 int rcv_numsacks; /* # distinct sack blks present */ 112 u_int t_tsomax; /* TSO total burst length limit in bytes */ 113 u_int t_tsomaxsegcount; /* TSO maximum segment count */ 114 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */ 115 tcp_seq rcv_nxt; /* receive next */ 116 tcp_seq rcv_adv; /* advertised window */ 117 uint32_t rcv_wnd; /* receive window */ 118 u_int t_flags2; /* More tcpcb flags storage */ 119 int t_srtt; /* smoothed round-trip time */ 120 int t_rttvar; /* variance in round-trip time */ 121 u_int32_t ts_recent; /* timestamp echo data */ 122 u_char snd_scale; /* window scaling for send window */ 123 u_char rcv_scale; /* window scaling for recv window */ 124 u_char snd_limited; /* segments limited transmitted */ 125 u_char request_r_scale; /* pending window scaling */ 126 tcp_seq last_ack_sent; 127 u_int t_rcvtime; /* inactivity time */ 128 /* Cache line 3 */ 129 tcp_seq rcv_up; /* receive urgent pointer */ 130 int t_segqlen; /* segment reassembly queue length */ 131 struct tsegqe_head t_segq; /* segment reassembly queue */ 132 struct mbuf *t_in_pkt; 133 struct mbuf *t_tail_pkt; 134 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 135 struct vnet *t_vnet; /* back pointer to parent vnet */ 136 uint32_t snd_ssthresh; /* snd_cwnd size threshold for 137 * for slow start exponential to 138 * linear switch 139 */ 140 tcp_seq snd_wl1; /* window update seg seq number */ 141 /* Cache line 4 */ 142 tcp_seq snd_wl2; /* window update seg ack number */ 143 144 tcp_seq irs; /* initial receive sequence number */ 145 tcp_seq iss; /* initial send sequence number */ 146 u_int t_acktime; 147 u_int ts_recent_age; /* when last updated */ 148 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 149 uint16_t cl4_spare; /* Spare to adjust CL 4 */ 150 char t_oobflags; /* have some */ 151 char t_iobc; /* input character */ 152 int t_rxtcur; /* current retransmit value (ticks) */ 153 154 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 155 u_int t_rtttime; /* RTT measurement start time */ 156 157 tcp_seq t_rtseq; /* sequence number being timed */ 158 u_int t_starttime; /* time connection was established */ 159 160 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */ 161 u_int t_rttmin; /* minimum rtt allowed */ 162 163 u_int t_rttbest; /* best rtt we've seen */ 164 165 int t_softerror; /* possible error not yet reported */ 166 uint32_t max_sndwnd; /* largest window peer has offered */ 167 /* Cache line 5 */ 168 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */ 169 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ 170 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 171 int t_sndzerowin; /* zero-window updates sent */ 172 u_long t_rttupdated; /* number of times rtt sampled */ 173 int snd_numholes; /* number of holes seen by sender */ 174 u_int t_badrxtwin; /* window for retransmit recovery */ 175 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 176 /* SACK scoreboard (sorted) */ 177 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 178 tcp_seq sack_newdata; /* New data xmitted in this recovery 179 episode starts at this seq number */ 180 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 181 struct sackhint sackhint; /* SACK scoreboard hint */ 182 int t_rttlow; /* smallest observerved RTT */ 183 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 184 struct toedev *tod; /* toedev handling this connection */ 185 int t_sndrexmitpack; /* retransmit packets sent */ 186 int t_rcvoopack; /* out-of-order packets received */ 187 void *t_toe; /* TOE pcb pointer */ 188 struct cc_algo *cc_algo; /* congestion control algorithm */ 189 struct cc_var *ccv; /* congestion control specific vars */ 190 struct osd *osd; /* storage for Khelp module data */ 191 int t_bytes_acked; /* # bytes acked during current RTT */ 192 u_int t_keepinit; /* time to establish connection */ 193 u_int t_keepidle; /* time before keepalive probes begin */ 194 u_int t_keepintvl; /* interval between keepalives */ 195 u_int t_keepcnt; /* number of keepalives before close */ 196 int t_dupacks; /* consecutive dup acks recd */ 197 int t_lognum; /* Number of log entries */ 198 struct tcp_log_stailq t_logs; /* Log buffer */ 199 struct tcp_log_id_node *t_lin; 200 struct tcp_log_id_bucket *t_lib; 201 const char *t_output_caller; /* Function that called tcp_output */ 202 uint32_t t_logsn; /* Log "serial number" */ 203 uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */ 204 unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */ 205 union { 206 uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN]; 207 uint64_t server; 208 } t_tfo_cookie; /* TCP Fast Open cookie to send */ 209 #ifdef TCPPCAP 210 struct mbufq t_inpkts; /* List of saved input packets. */ 211 struct mbufq t_outpkts; /* List of saved output packets. */ 212 #endif 213 }; 214 #endif /* _KERNEL || _WANT_TCPCB */ 215 216 #ifdef _KERNEL 217 struct tcptemp { 218 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 219 struct tcphdr tt_t; 220 }; 221 222 /* 223 * TODO: We yet need to brave plowing in 224 * to tcp_input() and the pru_usrreq() block. 225 * Right now these go to the old standards which 226 * are somewhat ok, but in the long term may 227 * need to be changed. If we do tackle tcp_input() 228 * then we need to get rid of the tcp_do_segment() 229 * function below. 230 */ 231 /* Flags for tcp functions */ 232 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */ 233 234 /* 235 * If defining the optional tcp_timers, in the 236 * tfb_tcp_timer_stop call you must use the 237 * callout_async_drain() function with the 238 * tcp_timer_discard callback. You should check 239 * the return of callout_async_drain() and if 0 240 * increment tt_draincnt. Since the timer sub-system 241 * does not know your callbacks you must provide a 242 * stop_all function that loops through and calls 243 * tcp_timer_stop() with each of your defined timers. 244 * Adding a tfb_tcp_handoff_ok function allows the socket 245 * option to change stacks to query you even if the 246 * connection is in a later stage. You return 0 to 247 * say you can take over and run your stack, you return 248 * non-zero (an error number) to say no you can't. 249 * If the function is undefined you can only change 250 * in the early states (before connect or listen). 251 * tfb_tcp_fb_fini is changed to add a flag to tell 252 * the old stack if the tcb is being destroyed or 253 * not. A one in the flag means the TCB is being 254 * destroyed, a zero indicates its transitioning to 255 * another stack (via socket option). 256 */ 257 struct tcp_function_block { 258 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX]; 259 int (*tfb_tcp_output)(struct tcpcb *); 260 int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *); 261 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *, 262 struct socket *, struct tcpcb *, 263 int, int, uint8_t, 264 int); 265 void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *, 266 struct socket *, struct tcpcb *, 267 int, int, uint8_t, 268 int, int, struct timeval *); 269 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt, 270 struct inpcb *inp, struct tcpcb *tp); 271 /* Optional memory allocation/free routine */ 272 int (*tfb_tcp_fb_init)(struct tcpcb *); 273 void (*tfb_tcp_fb_fini)(struct tcpcb *, int); 274 /* Optional timers, must define all if you define one */ 275 int (*tfb_tcp_timer_stop_all)(struct tcpcb *); 276 void (*tfb_tcp_timer_activate)(struct tcpcb *, 277 uint32_t, u_int); 278 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t); 279 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t); 280 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *); 281 int (*tfb_tcp_handoff_ok)(struct tcpcb *); 282 void (*tfb_tcp_mtu_chg)(struct tcpcb *); 283 volatile uint32_t tfb_refcnt; 284 uint32_t tfb_flags; 285 uint8_t tfb_id; 286 }; 287 288 struct tcp_function { 289 TAILQ_ENTRY(tcp_function) tf_next; 290 char tf_name[TCP_FUNCTION_NAME_LEN_MAX]; 291 struct tcp_function_block *tf_fb; 292 }; 293 294 TAILQ_HEAD(tcp_funchead, tcp_function); 295 #endif /* _KERNEL */ 296 297 /* 298 * Flags and utility macros for the t_flags field. 299 */ 300 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 301 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 302 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 303 #define TF_NOOPT 0x000008 /* don't use tcp options */ 304 #define TF_SENTFIN 0x000010 /* have sent FIN */ 305 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 306 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 307 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 308 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 309 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 310 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 311 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 312 #define TF_NOPUSH 0x001000 /* don't push */ 313 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */ 314 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 315 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 316 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 317 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 318 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 319 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 320 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 321 #define TF_FORCEDATA 0x800000 /* force out a byte */ 322 #define TF_TSO 0x1000000 /* TSO enabled on this connection */ 323 #define TF_TOE 0x2000000 /* this connection is offloaded */ 324 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 325 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 326 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 327 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 328 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 329 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */ 330 331 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 332 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 333 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 334 335 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 336 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 337 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 338 339 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 340 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 341 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 342 343 #if defined(_KERNEL) && !defined(TCP_RFC7413) 344 #define IS_FASTOPEN(t_flags) (false) 345 #else 346 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN) 347 #endif 348 349 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 350 351 /* 352 * Flags for the t_oobflags field. 353 */ 354 #define TCPOOB_HAVEDATA 0x01 355 #define TCPOOB_HADDATA 0x02 356 357 /* 358 * Flags for the extended TCP flags field, t_flags2 359 */ 360 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */ 361 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */ 362 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */ 363 #define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */ 364 365 /* 366 * Structure to hold TCP options that are only used during segment 367 * processing (in tcp_input), but not held in the tcpcb. 368 * It's basically used to reduce the number of parameters 369 * to tcp_dooptions and tcp_addoptions. 370 * The binary order of the to_flags is relevant for packing of the 371 * options in tcp_addoptions. 372 */ 373 struct tcpopt { 374 u_int32_t to_flags; /* which options are present */ 375 #define TOF_MSS 0x0001 /* maximum segment size */ 376 #define TOF_SCALE 0x0002 /* window scaling */ 377 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 378 #define TOF_TS 0x0010 /* timestamp */ 379 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 380 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 381 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */ 382 #define TOF_MAXOPT 0x0200 383 u_int32_t to_tsval; /* new timestamp */ 384 u_int32_t to_tsecr; /* reflected timestamp */ 385 u_char *to_sacks; /* pointer to the first SACK blocks */ 386 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 387 u_int8_t *to_tfo_cookie; /* pointer to the TFO cookie */ 388 u_int16_t to_mss; /* maximum segment size */ 389 u_int8_t to_wscale; /* window scaling */ 390 u_int8_t to_nsacks; /* number of SACK blocks */ 391 u_int8_t to_tfo_len; /* TFO cookie length */ 392 u_int32_t to_spare; /* UTO */ 393 }; 394 395 /* 396 * Flags for tcp_dooptions. 397 */ 398 #define TO_SYN 0x01 /* parse SYN-only options */ 399 400 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 401 uint32_t rmx_mtu; /* MTU for this path */ 402 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */ 403 uint32_t rmx_rtt; /* estimated round trip time */ 404 uint32_t rmx_rttvar; /* estimated rtt variance */ 405 uint32_t rmx_cwnd; /* congestion window */ 406 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */ 407 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */ 408 }; 409 410 /* 411 * Used by tcp_maxmtu() to communicate interface specific features 412 * and limits at the time of connection setup. 413 */ 414 struct tcp_ifcap { 415 int ifcap; 416 u_int tsomax; 417 u_int tsomaxsegcount; 418 u_int tsomaxsegsize; 419 }; 420 421 #ifndef _NETINET_IN_PCB_H_ 422 struct in_conninfo; 423 #endif /* _NETINET_IN_PCB_H_ */ 424 425 struct tcptw { 426 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 427 tcp_seq snd_nxt; 428 tcp_seq rcv_nxt; 429 tcp_seq iss; 430 tcp_seq irs; 431 u_short last_win; /* cached window value */ 432 short tw_so_options; /* copy of so_options */ 433 struct ucred *tw_cred; /* user credentials */ 434 u_int32_t t_recent; 435 u_int32_t ts_offset; /* our timestamp offset */ 436 u_int t_starttime; 437 int tw_time; 438 TAILQ_ENTRY(tcptw) tw_2msl; 439 void *tw_pspare; /* TCP_SIGNATURE */ 440 u_int *tw_spare; /* TCP_SIGNATURE */ 441 }; 442 443 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 444 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 445 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 446 447 /* 448 * The smoothed round-trip time and estimated variance 449 * are stored as fixed point numbers scaled by the values below. 450 * For convenience, these scales are also used in smoothing the average 451 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 452 * With these scales, srtt has 3 bits to the right of the binary point, 453 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 454 * binary point, and is smoothed with an ALPHA of 0.75. 455 */ 456 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 457 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 458 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 459 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 460 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 461 462 /* 463 * The initial retransmission should happen at rtt + 4 * rttvar. 464 * Because of the way we do the smoothing, srtt and rttvar 465 * will each average +1/2 tick of bias. When we compute 466 * the retransmit timer, we want 1/2 tick of rounding and 467 * 1 extra tick because of +-1/2 tick uncertainty in the 468 * firing of the timer. The bias will give us exactly the 469 * 1.5 tick we need. But, because the bias is 470 * statistical, we have to test that we don't drop below 471 * the minimum feasible timer (which is 2 ticks). 472 * This version of the macro adapted from a paper by Lawrence 473 * Brakmo and Larry Peterson which outlines a problem caused 474 * by insufficient precision in the original implementation, 475 * which results in inappropriately large RTO values for very 476 * fast networks. 477 */ 478 #define TCP_REXMTVAL(tp) \ 479 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 480 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 481 482 /* 483 * TCP statistics. 484 * Many of these should be kept per connection, 485 * but that's inconvenient at the moment. 486 */ 487 struct tcpstat { 488 uint64_t tcps_connattempt; /* connections initiated */ 489 uint64_t tcps_accepts; /* connections accepted */ 490 uint64_t tcps_connects; /* connections established */ 491 uint64_t tcps_drops; /* connections dropped */ 492 uint64_t tcps_conndrops; /* embryonic connections dropped */ 493 uint64_t tcps_minmssdrops; /* average minmss too low drops */ 494 uint64_t tcps_closed; /* conn. closed (includes drops) */ 495 uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 496 uint64_t tcps_rttupdated; /* times we succeeded */ 497 uint64_t tcps_delack; /* delayed acks sent */ 498 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 499 uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 500 uint64_t tcps_persisttimeo; /* persist timeouts */ 501 uint64_t tcps_keeptimeo; /* keepalive timeouts */ 502 uint64_t tcps_keepprobe; /* keepalive probes sent */ 503 uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 504 505 uint64_t tcps_sndtotal; /* total packets sent */ 506 uint64_t tcps_sndpack; /* data packets sent */ 507 uint64_t tcps_sndbyte; /* data bytes sent */ 508 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 509 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 510 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 511 uint64_t tcps_sndacks; /* ack-only packets sent */ 512 uint64_t tcps_sndprobe; /* window probes sent */ 513 uint64_t tcps_sndurg; /* packets sent with URG only */ 514 uint64_t tcps_sndwinup; /* window update-only packets sent */ 515 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 516 517 uint64_t tcps_rcvtotal; /* total packets received */ 518 uint64_t tcps_rcvpack; /* packets received in sequence */ 519 uint64_t tcps_rcvbyte; /* bytes received in sequence */ 520 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 521 uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 522 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */ 523 uint64_t tcps_rcvshort; /* packets received too short */ 524 uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 525 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 526 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 527 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 528 uint64_t tcps_rcvoopack; /* out-of-order packets received */ 529 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 530 uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 531 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 532 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 533 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 534 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 535 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 536 uint64_t tcps_rcvackpack; /* rcvd ack packets */ 537 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 538 uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 539 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 540 uint64_t tcps_predack; /* times hdr predict ok for acks */ 541 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 542 uint64_t tcps_pcbcachemiss; 543 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 544 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 545 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 546 uint64_t tcps_usedrtt; /* times RTT initialized from route */ 547 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 548 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 549 uint64_t tcps_persistdrop; /* timeout in persist state */ 550 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 551 uint64_t tcps_mturesent; /* resends due to MTU discovery */ 552 uint64_t tcps_listendrop; /* listen queue overflows */ 553 uint64_t tcps_badrst; /* ignored RSTs in the window */ 554 555 uint64_t tcps_sc_added; /* entry added to syncache */ 556 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 557 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 558 uint64_t tcps_sc_dropped; /* could not reply to packet */ 559 uint64_t tcps_sc_completed; /* successful extraction of entry */ 560 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 561 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 562 uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 563 uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 564 uint64_t tcps_sc_aborted; /* syncache entry aborted */ 565 uint64_t tcps_sc_badack; /* removed due to bad ACK */ 566 uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 567 uint64_t tcps_sc_zonefail; /* zalloc() failed */ 568 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 569 uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 570 571 uint64_t tcps_hc_added; /* entry added to hostcache */ 572 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 573 574 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 575 576 /* SACK related stats */ 577 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 578 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 579 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 580 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 581 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 582 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 583 584 /* ECN related stats */ 585 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */ 586 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */ 587 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */ 588 uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 589 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 590 591 /* TCP_SIGNATURE related stats */ 592 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 593 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 594 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */ 595 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 596 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 597 598 /* Path MTU Discovery Black Hole Detection related stats */ 599 uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */ 600 uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */ 601 uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */ 602 603 uint64_t _pad[12]; /* 6 UTO, 6 TBD */ 604 }; 605 606 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */ 607 608 #ifdef _KERNEL 609 #define TI_UNLOCKED 1 610 #define TI_RLOCKED 2 611 #include <sys/counter.h> 612 613 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 614 /* 615 * In-kernel consumers can use these accessor macros directly to update 616 * stats. 617 */ 618 #define TCPSTAT_ADD(name, val) \ 619 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val)) 620 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 621 622 /* 623 * Kernel module consumers must use this accessor macro. 624 */ 625 void kmod_tcpstat_inc(int statnum); 626 #define KMOD_TCPSTAT_INC(name) \ 627 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t)) 628 629 /* 630 * Running TCP connection count by state. 631 */ 632 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]); 633 #define V_tcps_states VNET(tcps_states) 634 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1) 635 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1) 636 637 /* 638 * TCP specific helper hook point identifiers. 639 */ 640 #define HHOOK_TCP_EST_IN 0 641 #define HHOOK_TCP_EST_OUT 1 642 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 643 644 struct tcp_hhook_data { 645 struct tcpcb *tp; 646 struct tcphdr *th; 647 struct tcpopt *to; 648 uint32_t len; 649 int tso; 650 tcp_seq curack; 651 }; 652 #endif 653 654 /* 655 * TCB structure exported to user-land via sysctl(3). 656 * 657 * Fields prefixed with "xt_" are unique to the export structure, and fields 658 * with "t_" or other prefixes match corresponding fields of 'struct tcpcb'. 659 * 660 * Legend: 661 * (s) - used by userland utilities in src 662 * (p) - used by utilities in ports 663 * (3) - is known to be used by third party software not in ports 664 * (n) - no known usage 665 * 666 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 667 * included. Not all of our clients do. 668 */ 669 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 670 struct xtcpcb { 671 size_t xt_len; /* length of this structure */ 672 struct xinpcb xt_inp; 673 char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */ 674 char xt_logid[TCP_LOG_ID_LEN]; /* (s) */ 675 int64_t spare64[8]; 676 int32_t t_state; /* (s,p) */ 677 uint32_t t_flags; /* (s,p) */ 678 int32_t t_sndzerowin; /* (s) */ 679 int32_t t_sndrexmitpack; /* (s) */ 680 int32_t t_rcvoopack; /* (s) */ 681 int32_t t_rcvtime; /* (s) */ 682 int32_t tt_rexmt; /* (s) */ 683 int32_t tt_persist; /* (s) */ 684 int32_t tt_keep; /* (s) */ 685 int32_t tt_2msl; /* (s) */ 686 int32_t tt_delack; /* (s) */ 687 int32_t t_logstate; /* (3) */ 688 int32_t spare32[32]; 689 } __aligned(8); 690 691 #ifdef _KERNEL 692 void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *); 693 #endif 694 #endif 695 696 /* 697 * TCP function information (name-to-id mapping, aliases, and refcnt) 698 * exported to user-land via sysctl(3). 699 */ 700 struct tcp_function_info { 701 uint32_t tfi_refcnt; 702 uint8_t tfi_id; 703 char tfi_name[TCP_FUNCTION_NAME_LEN_MAX]; 704 char tfi_alias[TCP_FUNCTION_NAME_LEN_MAX]; 705 }; 706 707 /* 708 * Identifiers for TCP sysctl nodes 709 */ 710 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 711 #define TCPCTL_MSSDFLT 3 /* MSS default */ 712 #define TCPCTL_STATS 4 /* statistics */ 713 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 714 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 715 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 716 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 717 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 718 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 719 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 720 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 721 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 722 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 723 #define TCPCTL_DROP 15 /* drop tcp connection */ 724 #define TCPCTL_STATES 16 /* connection counts by TCP state */ 725 726 #ifdef _KERNEL 727 #ifdef SYSCTL_DECL 728 SYSCTL_DECL(_net_inet_tcp); 729 SYSCTL_DECL(_net_inet_tcp_sack); 730 MALLOC_DECLARE(M_TCPLOG); 731 #endif 732 733 extern int tcp_log_in_vain; 734 735 /* 736 * Global TCP tunables shared between different stacks. 737 * Please keep the list sorted. 738 */ 739 VNET_DECLARE(int, drop_synfin); 740 VNET_DECLARE(int, path_mtu_discovery); 741 VNET_DECLARE(int, tcp_abc_l_var); 742 VNET_DECLARE(int, tcp_autorcvbuf_inc); 743 VNET_DECLARE(int, tcp_autorcvbuf_max); 744 VNET_DECLARE(int, tcp_autosndbuf_inc); 745 VNET_DECLARE(int, tcp_autosndbuf_max); 746 VNET_DECLARE(int, tcp_delack_enabled); 747 VNET_DECLARE(int, tcp_do_autorcvbuf); 748 VNET_DECLARE(int, tcp_do_autosndbuf); 749 VNET_DECLARE(int, tcp_do_ecn); 750 VNET_DECLARE(int, tcp_do_rfc1323); 751 VNET_DECLARE(int, tcp_do_rfc3042); 752 VNET_DECLARE(int, tcp_do_rfc3390); 753 VNET_DECLARE(int, tcp_do_rfc3465); 754 VNET_DECLARE(int, tcp_do_rfc6675_pipe); 755 VNET_DECLARE(int, tcp_do_sack); 756 VNET_DECLARE(int, tcp_do_tso); 757 VNET_DECLARE(int, tcp_ecn_maxretries); 758 VNET_DECLARE(int, tcp_initcwnd_segments); 759 VNET_DECLARE(int, tcp_insecure_rst); 760 VNET_DECLARE(int, tcp_insecure_syn); 761 VNET_DECLARE(int, tcp_minmss); 762 VNET_DECLARE(int, tcp_mssdflt); 763 VNET_DECLARE(int, tcp_recvspace); 764 VNET_DECLARE(int, tcp_sack_globalholes); 765 VNET_DECLARE(int, tcp_sack_globalmaxholes); 766 VNET_DECLARE(int, tcp_sack_maxholes); 767 VNET_DECLARE(int, tcp_sc_rst_sock_fail); 768 VNET_DECLARE(int, tcp_sendspace); 769 VNET_DECLARE(struct inpcbhead, tcb); 770 VNET_DECLARE(struct inpcbinfo, tcbinfo); 771 772 #define V_drop_synfin VNET(drop_synfin) 773 #define V_path_mtu_discovery VNET(path_mtu_discovery) 774 #define V_tcb VNET(tcb) 775 #define V_tcbinfo VNET(tcbinfo) 776 #define V_tcp_abc_l_var VNET(tcp_abc_l_var) 777 #define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc) 778 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max) 779 #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc) 780 #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max) 781 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 782 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf) 783 #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf) 784 #define V_tcp_do_ecn VNET(tcp_do_ecn) 785 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 786 #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042) 787 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 788 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 789 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe) 790 #define V_tcp_do_sack VNET(tcp_do_sack) 791 #define V_tcp_do_tso VNET(tcp_do_tso) 792 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 793 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments) 794 #define V_tcp_insecure_rst VNET(tcp_insecure_rst) 795 #define V_tcp_insecure_syn VNET(tcp_insecure_syn) 796 #define V_tcp_minmss VNET(tcp_minmss) 797 #define V_tcp_mssdflt VNET(tcp_mssdflt) 798 #define V_tcp_recvspace VNET(tcp_recvspace) 799 #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes) 800 #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes) 801 #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes) 802 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 803 #define V_tcp_sendspace VNET(tcp_sendspace) 804 805 #ifdef TCP_HHOOK 806 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 807 #define V_tcp_hhh VNET(tcp_hhh) 808 #endif 809 810 int tcp_addoptions(struct tcpopt *, u_char *); 811 int tcp_ccalgounload(struct cc_algo *unload_algo); 812 struct tcpcb * 813 tcp_close(struct tcpcb *); 814 void tcp_discardcb(struct tcpcb *); 815 void tcp_twstart(struct tcpcb *); 816 void tcp_twclose(struct tcptw *, int); 817 void tcp_ctlinput(int, struct sockaddr *, void *); 818 int tcp_ctloutput(struct socket *, struct sockopt *); 819 struct tcpcb * 820 tcp_drop(struct tcpcb *, int); 821 void tcp_drain(void); 822 void tcp_init(void); 823 void tcp_fini(void *); 824 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 825 const void *); 826 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 827 const void *); 828 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 829 void tcp_reass_global_init(void); 830 void tcp_reass_flush(struct tcpcb *); 831 void tcp_dooptions(struct tcpopt *, u_char *, int, int); 832 void tcp_dropwithreset(struct mbuf *, struct tcphdr *, 833 struct tcpcb *, int, int); 834 void tcp_pulloutofband(struct socket *, 835 struct tcphdr *, struct mbuf *, int); 836 void tcp_xmit_timer(struct tcpcb *, int); 837 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *); 838 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th, 839 uint16_t nsegs, uint16_t type); 840 void cc_conn_init(struct tcpcb *tp); 841 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th); 842 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 843 #ifdef TCP_HHOOK 844 void hhook_run_tcp_est_in(struct tcpcb *tp, 845 struct tcphdr *th, struct tcpopt *to); 846 #endif 847 848 int tcp_input(struct mbuf **, int *, int); 849 int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *, 850 struct tcpcb *, int); 851 void tcp_do_segment(struct mbuf *, struct tcphdr *, 852 struct socket *, struct tcpcb *, int, int, uint8_t, 853 int); 854 855 int register_tcp_functions(struct tcp_function_block *blk, int wait); 856 int register_tcp_functions_as_names(struct tcp_function_block *blk, 857 int wait, const char *names[], int *num_names); 858 int register_tcp_functions_as_name(struct tcp_function_block *blk, 859 const char *name, int wait); 860 int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce, 861 bool force); 862 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs); 863 void tcp_switch_back_to_default(struct tcpcb *tp); 864 struct tcp_function_block * 865 find_and_ref_tcp_fb(struct tcp_function_block *fs); 866 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp); 867 868 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 869 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 870 u_int tcp_maxseg(const struct tcpcb *); 871 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 872 struct tcp_ifcap *); 873 void tcp_mss(struct tcpcb *, int); 874 int tcp_mssopt(struct in_conninfo *); 875 struct inpcb * 876 tcp_drop_syn_sent(struct inpcb *, int); 877 struct tcpcb * 878 tcp_newtcpcb(struct inpcb *); 879 int tcp_output(struct tcpcb *); 880 void tcp_state_change(struct tcpcb *, int); 881 void tcp_respond(struct tcpcb *, void *, 882 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 883 void tcp_tw_init(void); 884 #ifdef VIMAGE 885 void tcp_tw_destroy(void); 886 #endif 887 void tcp_tw_zone_change(void); 888 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 889 struct mbuf *, int); 890 void tcp_setpersist(struct tcpcb *); 891 void tcp_slowtimo(void); 892 struct tcptemp * 893 tcpip_maketemplate(struct inpcb *); 894 void tcpip_fillheaders(struct inpcb *, void *, void *); 895 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int); 896 int tcp_timer_active(struct tcpcb *, uint32_t); 897 void tcp_timer_stop(struct tcpcb *, uint32_t); 898 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 899 /* 900 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 901 */ 902 void tcp_hc_init(void); 903 #ifdef VIMAGE 904 void tcp_hc_destroy(void); 905 #endif 906 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 907 uint32_t tcp_hc_getmtu(struct in_conninfo *); 908 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t); 909 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 910 911 extern struct pr_usrreqs tcp_usrreqs; 912 tcp_seq tcp_new_isn(struct tcpcb *); 913 914 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 915 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 916 void tcp_clean_sackreport(struct tcpcb *tp); 917 void tcp_sack_adjust(struct tcpcb *tp); 918 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 919 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 920 void tcp_free_sackholes(struct tcpcb *tp); 921 int tcp_newreno(struct tcpcb *, struct tcphdr *); 922 int tcp_compute_pipe(struct tcpcb *); 923 void tcp_sndbuf_autoscale(struct tcpcb *, struct socket *, uint32_t); 924 925 static inline void 926 tcp_fields_to_host(struct tcphdr *th) 927 { 928 929 th->th_seq = ntohl(th->th_seq); 930 th->th_ack = ntohl(th->th_ack); 931 th->th_win = ntohs(th->th_win); 932 th->th_urp = ntohs(th->th_urp); 933 } 934 935 static inline void 936 tcp_fields_to_net(struct tcphdr *th) 937 { 938 939 th->th_seq = htonl(th->th_seq); 940 th->th_ack = htonl(th->th_ack); 941 th->th_win = htons(th->th_win); 942 th->th_urp = htons(th->th_urp); 943 } 944 #endif /* _KERNEL */ 945 946 #endif /* _NETINET_TCP_VAR_H_ */ 947