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 t_fin_is_rst: 1, /* Are fin's treated as resets */ 106 bits_spare : 3; 107 u_int t_flags; 108 tcp_seq snd_una; /* sent but unacknowledged */ 109 tcp_seq snd_max; /* highest sequence number sent; 110 * used to recognize retransmits 111 */ 112 tcp_seq snd_nxt; /* send next */ 113 tcp_seq snd_up; /* send urgent pointer */ 114 uint32_t snd_wnd; /* send window */ 115 uint32_t snd_cwnd; /* congestion-controlled window */ 116 uint32_t t_peakrate_thr; /* pre-calculated peak rate threshold */ 117 /* Cache line 2 */ 118 u_int32_t ts_offset; /* our timestamp offset */ 119 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 120 int rcv_numsacks; /* # distinct sack blks present */ 121 u_int t_tsomax; /* TSO total burst length limit in bytes */ 122 u_int t_tsomaxsegcount; /* TSO maximum segment count */ 123 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */ 124 tcp_seq rcv_nxt; /* receive next */ 125 tcp_seq rcv_adv; /* advertised window */ 126 uint32_t rcv_wnd; /* receive window */ 127 u_int t_flags2; /* More tcpcb flags storage */ 128 int t_srtt; /* smoothed round-trip time */ 129 int t_rttvar; /* variance in round-trip time */ 130 u_int32_t ts_recent; /* timestamp echo data */ 131 u_char snd_scale; /* window scaling for send window */ 132 u_char rcv_scale; /* window scaling for recv window */ 133 u_char snd_limited; /* segments limited transmitted */ 134 u_char request_r_scale; /* pending window scaling */ 135 tcp_seq last_ack_sent; 136 u_int t_rcvtime; /* inactivity time */ 137 /* Cache line 3 */ 138 tcp_seq rcv_up; /* receive urgent pointer */ 139 int t_segqlen; /* segment reassembly queue length */ 140 uint32_t t_segqmbuflen; /* Count of bytes mbufs on all entries */ 141 struct tsegqe_head t_segq; /* segment reassembly queue */ 142 struct mbuf *t_in_pkt; 143 struct mbuf *t_tail_pkt; 144 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 145 struct vnet *t_vnet; /* back pointer to parent vnet */ 146 uint32_t snd_ssthresh; /* snd_cwnd size threshold for 147 * for slow start exponential to 148 * linear switch 149 */ 150 tcp_seq snd_wl1; /* window update seg seq number */ 151 /* Cache line 4 */ 152 tcp_seq snd_wl2; /* window update seg ack number */ 153 154 tcp_seq irs; /* initial receive sequence number */ 155 tcp_seq iss; /* initial send sequence number */ 156 u_int t_acktime; 157 u_int ts_recent_age; /* when last updated */ 158 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 159 uint16_t cl4_spare; /* Spare to adjust CL 4 */ 160 char t_oobflags; /* have some */ 161 char t_iobc; /* input character */ 162 int t_rxtcur; /* current retransmit value (ticks) */ 163 164 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 165 u_int t_rtttime; /* RTT measurement start time */ 166 167 tcp_seq t_rtseq; /* sequence number being timed */ 168 u_int t_starttime; /* time connection was established */ 169 170 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */ 171 u_int t_rttmin; /* minimum rtt allowed */ 172 173 u_int t_rttbest; /* best rtt we've seen */ 174 175 int t_softerror; /* possible error not yet reported */ 176 uint32_t max_sndwnd; /* largest window peer has offered */ 177 /* Cache line 5 */ 178 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */ 179 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ 180 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 181 int t_sndzerowin; /* zero-window updates sent */ 182 u_long t_rttupdated; /* number of times rtt sampled */ 183 int snd_numholes; /* number of holes seen by sender */ 184 u_int t_badrxtwin; /* window for retransmit recovery */ 185 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 186 /* SACK scoreboard (sorted) */ 187 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 188 tcp_seq sack_newdata; /* New data xmitted in this recovery 189 episode starts at this seq number */ 190 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 191 struct sackhint sackhint; /* SACK scoreboard hint */ 192 int t_rttlow; /* smallest observerved RTT */ 193 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 194 struct toedev *tod; /* toedev handling this connection */ 195 int t_sndrexmitpack; /* retransmit packets sent */ 196 int t_rcvoopack; /* out-of-order packets received */ 197 void *t_toe; /* TOE pcb pointer */ 198 struct cc_algo *cc_algo; /* congestion control algorithm */ 199 struct cc_var *ccv; /* congestion control specific vars */ 200 struct osd *osd; /* storage for Khelp module data */ 201 int t_bytes_acked; /* # bytes acked during current RTT */ 202 u_int t_maxunacktime; 203 u_int t_keepinit; /* time to establish connection */ 204 u_int t_keepidle; /* time before keepalive probes begin */ 205 u_int t_keepintvl; /* interval between keepalives */ 206 u_int t_keepcnt; /* number of keepalives before close */ 207 int t_dupacks; /* consecutive dup acks recd */ 208 int t_lognum; /* Number of log entries */ 209 struct tcp_log_stailq t_logs; /* Log buffer */ 210 struct tcp_log_id_node *t_lin; 211 struct tcp_log_id_bucket *t_lib; 212 const char *t_output_caller; /* Function that called tcp_output */ 213 uint32_t t_logsn; /* Log "serial number" */ 214 uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */ 215 unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */ 216 union { 217 uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN]; 218 uint64_t server; 219 } t_tfo_cookie; /* TCP Fast Open cookie to send */ 220 #ifdef TCPPCAP 221 struct mbufq t_inpkts; /* List of saved input packets. */ 222 struct mbufq t_outpkts; /* List of saved output packets. */ 223 #endif 224 }; 225 #endif /* _KERNEL || _WANT_TCPCB */ 226 227 #ifdef _KERNEL 228 struct tcptemp { 229 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 230 struct tcphdr tt_t; 231 }; 232 233 /* 234 * TODO: We yet need to brave plowing in 235 * to tcp_input() and the pru_usrreq() block. 236 * Right now these go to the old standards which 237 * are somewhat ok, but in the long term may 238 * need to be changed. If we do tackle tcp_input() 239 * then we need to get rid of the tcp_do_segment() 240 * function below. 241 */ 242 /* Flags for tcp functions */ 243 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */ 244 245 /* 246 * If defining the optional tcp_timers, in the 247 * tfb_tcp_timer_stop call you must use the 248 * callout_async_drain() function with the 249 * tcp_timer_discard callback. You should check 250 * the return of callout_async_drain() and if 0 251 * increment tt_draincnt. Since the timer sub-system 252 * does not know your callbacks you must provide a 253 * stop_all function that loops through and calls 254 * tcp_timer_stop() with each of your defined timers. 255 * Adding a tfb_tcp_handoff_ok function allows the socket 256 * option to change stacks to query you even if the 257 * connection is in a later stage. You return 0 to 258 * say you can take over and run your stack, you return 259 * non-zero (an error number) to say no you can't. 260 * If the function is undefined you can only change 261 * in the early states (before connect or listen). 262 * tfb_tcp_fb_fini is changed to add a flag to tell 263 * the old stack if the tcb is being destroyed or 264 * not. A one in the flag means the TCB is being 265 * destroyed, a zero indicates its transitioning to 266 * another stack (via socket option). 267 */ 268 struct tcp_function_block { 269 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX]; 270 int (*tfb_tcp_output)(struct tcpcb *); 271 int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *); 272 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *, 273 struct socket *, struct tcpcb *, 274 int, int, uint8_t); 275 int (*tfb_do_queued_segments)(struct socket *, struct tcpcb *, int); 276 int (*tfb_do_segment_nounlock)(struct mbuf *, struct tcphdr *, 277 struct socket *, struct tcpcb *, 278 int, int, uint8_t, 279 int, struct timeval *); 280 void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *, 281 struct socket *, struct tcpcb *, 282 int, int, uint8_t, 283 int, struct timeval *); 284 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt, 285 struct inpcb *inp, struct tcpcb *tp); 286 /* Optional memory allocation/free routine */ 287 int (*tfb_tcp_fb_init)(struct tcpcb *); 288 void (*tfb_tcp_fb_fini)(struct tcpcb *, int); 289 /* Optional timers, must define all if you define one */ 290 int (*tfb_tcp_timer_stop_all)(struct tcpcb *); 291 void (*tfb_tcp_timer_activate)(struct tcpcb *, 292 uint32_t, u_int); 293 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t); 294 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t); 295 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *); 296 int (*tfb_tcp_handoff_ok)(struct tcpcb *); 297 void (*tfb_tcp_mtu_chg)(struct tcpcb *); 298 volatile uint32_t tfb_refcnt; 299 uint32_t tfb_flags; 300 uint8_t tfb_id; 301 }; 302 303 struct tcp_function { 304 TAILQ_ENTRY(tcp_function) tf_next; 305 char tf_name[TCP_FUNCTION_NAME_LEN_MAX]; 306 struct tcp_function_block *tf_fb; 307 }; 308 309 TAILQ_HEAD(tcp_funchead, tcp_function); 310 #endif /* _KERNEL */ 311 312 /* 313 * Flags and utility macros for the t_flags field. 314 */ 315 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 316 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 317 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 318 #define TF_NOOPT 0x000008 /* don't use tcp options */ 319 #define TF_SENTFIN 0x000010 /* have sent FIN */ 320 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 321 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 322 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 323 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 324 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 325 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 326 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 327 #define TF_NOPUSH 0x001000 /* don't push */ 328 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */ 329 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 330 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 331 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 332 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 333 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 334 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 335 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 336 #define TF_FORCEDATA 0x800000 /* force out a byte */ 337 #define TF_TSO 0x1000000 /* TSO enabled on this connection */ 338 #define TF_TOE 0x2000000 /* this connection is offloaded */ 339 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 340 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 341 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 342 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 343 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 344 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */ 345 346 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 347 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 348 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 349 350 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 351 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 352 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 353 354 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 355 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 356 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 357 358 #if defined(_KERNEL) && !defined(TCP_RFC7413) 359 #define IS_FASTOPEN(t_flags) (false) 360 #else 361 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN) 362 #endif 363 364 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 365 366 /* 367 * Flags for the t_oobflags field. 368 */ 369 #define TCPOOB_HAVEDATA 0x01 370 #define TCPOOB_HADDATA 0x02 371 372 /* 373 * Flags for the extended TCP flags field, t_flags2 374 */ 375 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */ 376 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */ 377 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */ 378 #define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */ 379 #define TF2_DROP_AF_DATA 0x00000010 /* Drop after all data ack'd */ 380 381 /* 382 * Structure to hold TCP options that are only used during segment 383 * processing (in tcp_input), but not held in the tcpcb. 384 * It's basically used to reduce the number of parameters 385 * to tcp_dooptions and tcp_addoptions. 386 * The binary order of the to_flags is relevant for packing of the 387 * options in tcp_addoptions. 388 */ 389 struct tcpopt { 390 u_int32_t to_flags; /* which options are present */ 391 #define TOF_MSS 0x0001 /* maximum segment size */ 392 #define TOF_SCALE 0x0002 /* window scaling */ 393 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 394 #define TOF_TS 0x0010 /* timestamp */ 395 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 396 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 397 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */ 398 #define TOF_MAXOPT 0x0200 399 u_int32_t to_tsval; /* new timestamp */ 400 u_int32_t to_tsecr; /* reflected timestamp */ 401 u_char *to_sacks; /* pointer to the first SACK blocks */ 402 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 403 u_int8_t *to_tfo_cookie; /* pointer to the TFO cookie */ 404 u_int16_t to_mss; /* maximum segment size */ 405 u_int8_t to_wscale; /* window scaling */ 406 u_int8_t to_nsacks; /* number of SACK blocks */ 407 u_int8_t to_tfo_len; /* TFO cookie length */ 408 u_int32_t to_spare; /* UTO */ 409 }; 410 411 /* 412 * Flags for tcp_dooptions. 413 */ 414 #define TO_SYN 0x01 /* parse SYN-only options */ 415 416 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 417 uint32_t rmx_mtu; /* MTU for this path */ 418 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */ 419 uint32_t rmx_rtt; /* estimated round trip time */ 420 uint32_t rmx_rttvar; /* estimated rtt variance */ 421 uint32_t rmx_cwnd; /* congestion window */ 422 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */ 423 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */ 424 }; 425 426 /* 427 * Used by tcp_maxmtu() to communicate interface specific features 428 * and limits at the time of connection setup. 429 */ 430 struct tcp_ifcap { 431 int ifcap; 432 u_int tsomax; 433 u_int tsomaxsegcount; 434 u_int tsomaxsegsize; 435 }; 436 437 #ifndef _NETINET_IN_PCB_H_ 438 struct in_conninfo; 439 #endif /* _NETINET_IN_PCB_H_ */ 440 441 struct tcptw { 442 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 443 tcp_seq snd_nxt; 444 tcp_seq rcv_nxt; 445 tcp_seq iss; 446 tcp_seq irs; 447 u_short last_win; /* cached window value */ 448 short tw_so_options; /* copy of so_options */ 449 struct ucred *tw_cred; /* user credentials */ 450 u_int32_t t_recent; 451 u_int32_t ts_offset; /* our timestamp offset */ 452 u_int t_starttime; 453 int tw_time; 454 TAILQ_ENTRY(tcptw) tw_2msl; 455 void *tw_pspare; /* TCP_SIGNATURE */ 456 u_int *tw_spare; /* TCP_SIGNATURE */ 457 }; 458 459 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 460 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 461 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 462 463 /* 464 * The smoothed round-trip time and estimated variance 465 * are stored as fixed point numbers scaled by the values below. 466 * For convenience, these scales are also used in smoothing the average 467 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 468 * With these scales, srtt has 3 bits to the right of the binary point, 469 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 470 * binary point, and is smoothed with an ALPHA of 0.75. 471 */ 472 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 473 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 474 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 475 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 476 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 477 478 /* 479 * The initial retransmission should happen at rtt + 4 * rttvar. 480 * Because of the way we do the smoothing, srtt and rttvar 481 * will each average +1/2 tick of bias. When we compute 482 * the retransmit timer, we want 1/2 tick of rounding and 483 * 1 extra tick because of +-1/2 tick uncertainty in the 484 * firing of the timer. The bias will give us exactly the 485 * 1.5 tick we need. But, because the bias is 486 * statistical, we have to test that we don't drop below 487 * the minimum feasible timer (which is 2 ticks). 488 * This version of the macro adapted from a paper by Lawrence 489 * Brakmo and Larry Peterson which outlines a problem caused 490 * by insufficient precision in the original implementation, 491 * which results in inappropriately large RTO values for very 492 * fast networks. 493 */ 494 #define TCP_REXMTVAL(tp) \ 495 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 496 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 497 498 /* 499 * TCP statistics. 500 * Many of these should be kept per connection, 501 * but that's inconvenient at the moment. 502 */ 503 struct tcpstat { 504 uint64_t tcps_connattempt; /* connections initiated */ 505 uint64_t tcps_accepts; /* connections accepted */ 506 uint64_t tcps_connects; /* connections established */ 507 uint64_t tcps_drops; /* connections dropped */ 508 uint64_t tcps_conndrops; /* embryonic connections dropped */ 509 uint64_t tcps_minmssdrops; /* average minmss too low drops */ 510 uint64_t tcps_closed; /* conn. closed (includes drops) */ 511 uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 512 uint64_t tcps_rttupdated; /* times we succeeded */ 513 uint64_t tcps_delack; /* delayed acks sent */ 514 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 515 uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 516 uint64_t tcps_persisttimeo; /* persist timeouts */ 517 uint64_t tcps_keeptimeo; /* keepalive timeouts */ 518 uint64_t tcps_keepprobe; /* keepalive probes sent */ 519 uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 520 521 uint64_t tcps_sndtotal; /* total packets sent */ 522 uint64_t tcps_sndpack; /* data packets sent */ 523 uint64_t tcps_sndbyte; /* data bytes sent */ 524 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 525 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 526 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 527 uint64_t tcps_sndacks; /* ack-only packets sent */ 528 uint64_t tcps_sndprobe; /* window probes sent */ 529 uint64_t tcps_sndurg; /* packets sent with URG only */ 530 uint64_t tcps_sndwinup; /* window update-only packets sent */ 531 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 532 533 uint64_t tcps_rcvtotal; /* total packets received */ 534 uint64_t tcps_rcvpack; /* packets received in sequence */ 535 uint64_t tcps_rcvbyte; /* bytes received in sequence */ 536 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 537 uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 538 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */ 539 uint64_t tcps_rcvshort; /* packets received too short */ 540 uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 541 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 542 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 543 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 544 uint64_t tcps_rcvoopack; /* out-of-order packets received */ 545 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 546 uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 547 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 548 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 549 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 550 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 551 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 552 uint64_t tcps_rcvackpack; /* rcvd ack packets */ 553 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 554 uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 555 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 556 uint64_t tcps_predack; /* times hdr predict ok for acks */ 557 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 558 uint64_t tcps_pcbcachemiss; 559 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 560 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 561 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 562 uint64_t tcps_usedrtt; /* times RTT initialized from route */ 563 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 564 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 565 uint64_t tcps_persistdrop; /* timeout in persist state */ 566 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 567 uint64_t tcps_mturesent; /* resends due to MTU discovery */ 568 uint64_t tcps_listendrop; /* listen queue overflows */ 569 uint64_t tcps_badrst; /* ignored RSTs in the window */ 570 571 uint64_t tcps_sc_added; /* entry added to syncache */ 572 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 573 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 574 uint64_t tcps_sc_dropped; /* could not reply to packet */ 575 uint64_t tcps_sc_completed; /* successful extraction of entry */ 576 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 577 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 578 uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 579 uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 580 uint64_t tcps_sc_aborted; /* syncache entry aborted */ 581 uint64_t tcps_sc_badack; /* removed due to bad ACK */ 582 uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 583 uint64_t tcps_sc_zonefail; /* zalloc() failed */ 584 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 585 uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 586 587 uint64_t tcps_hc_added; /* entry added to hostcache */ 588 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 589 590 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 591 592 /* SACK related stats */ 593 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 594 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 595 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 596 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 597 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 598 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 599 600 /* ECN related stats */ 601 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */ 602 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */ 603 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */ 604 uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 605 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 606 607 /* TCP_SIGNATURE related stats */ 608 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 609 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 610 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */ 611 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 612 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 613 614 /* Path MTU Discovery Black Hole Detection related stats */ 615 uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */ 616 uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */ 617 uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */ 618 619 uint64_t _pad[12]; /* 6 UTO, 6 TBD */ 620 }; 621 622 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */ 623 624 #ifdef _KERNEL 625 #define TI_UNLOCKED 1 626 #define TI_RLOCKED 2 627 #include <sys/counter.h> 628 629 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 630 /* 631 * In-kernel consumers can use these accessor macros directly to update 632 * stats. 633 */ 634 #define TCPSTAT_ADD(name, val) \ 635 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val)) 636 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 637 638 /* 639 * Kernel module consumers must use this accessor macro. 640 */ 641 void kmod_tcpstat_inc(int statnum); 642 #define KMOD_TCPSTAT_INC(name) \ 643 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t)) 644 645 /* 646 * Running TCP connection count by state. 647 */ 648 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]); 649 #define V_tcps_states VNET(tcps_states) 650 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1) 651 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1) 652 653 /* 654 * TCP specific helper hook point identifiers. 655 */ 656 #define HHOOK_TCP_EST_IN 0 657 #define HHOOK_TCP_EST_OUT 1 658 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 659 660 struct tcp_hhook_data { 661 struct tcpcb *tp; 662 struct tcphdr *th; 663 struct tcpopt *to; 664 uint32_t len; 665 int tso; 666 tcp_seq curack; 667 }; 668 #ifdef TCP_HHOOK 669 void hhook_run_tcp_est_out(struct tcpcb *tp, 670 struct tcphdr *th, struct tcpopt *to, 671 uint32_t len, int tso); 672 #endif 673 #endif 674 675 /* 676 * TCB structure exported to user-land via sysctl(3). 677 * 678 * Fields prefixed with "xt_" are unique to the export structure, and fields 679 * with "t_" or other prefixes match corresponding fields of 'struct tcpcb'. 680 * 681 * Legend: 682 * (s) - used by userland utilities in src 683 * (p) - used by utilities in ports 684 * (3) - is known to be used by third party software not in ports 685 * (n) - no known usage 686 * 687 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 688 * included. Not all of our clients do. 689 */ 690 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 691 struct xtcpcb { 692 ksize_t xt_len; /* length of this structure */ 693 struct xinpcb xt_inp; 694 char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */ 695 char xt_logid[TCP_LOG_ID_LEN]; /* (s) */ 696 int64_t spare64[8]; 697 int32_t t_state; /* (s,p) */ 698 uint32_t t_flags; /* (s,p) */ 699 int32_t t_sndzerowin; /* (s) */ 700 int32_t t_sndrexmitpack; /* (s) */ 701 int32_t t_rcvoopack; /* (s) */ 702 int32_t t_rcvtime; /* (s) */ 703 int32_t tt_rexmt; /* (s) */ 704 int32_t tt_persist; /* (s) */ 705 int32_t tt_keep; /* (s) */ 706 int32_t tt_2msl; /* (s) */ 707 int32_t tt_delack; /* (s) */ 708 int32_t t_logstate; /* (3) */ 709 int32_t spare32[32]; 710 } __aligned(8); 711 712 #ifdef _KERNEL 713 void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *); 714 #endif 715 #endif 716 717 /* 718 * TCP function information (name-to-id mapping, aliases, and refcnt) 719 * exported to user-land via sysctl(3). 720 */ 721 struct tcp_function_info { 722 uint32_t tfi_refcnt; 723 uint8_t tfi_id; 724 char tfi_name[TCP_FUNCTION_NAME_LEN_MAX]; 725 char tfi_alias[TCP_FUNCTION_NAME_LEN_MAX]; 726 }; 727 728 /* 729 * Identifiers for TCP sysctl nodes 730 */ 731 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 732 #define TCPCTL_MSSDFLT 3 /* MSS default */ 733 #define TCPCTL_STATS 4 /* statistics */ 734 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 735 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 736 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 737 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 738 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 739 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 740 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 741 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 742 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 743 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 744 #define TCPCTL_DROP 15 /* drop tcp connection */ 745 #define TCPCTL_STATES 16 /* connection counts by TCP state */ 746 747 #ifdef _KERNEL 748 #ifdef SYSCTL_DECL 749 SYSCTL_DECL(_net_inet_tcp); 750 SYSCTL_DECL(_net_inet_tcp_sack); 751 MALLOC_DECLARE(M_TCPLOG); 752 #endif 753 754 extern int tcp_log_in_vain; 755 756 /* 757 * Global TCP tunables shared between different stacks. 758 * Please keep the list sorted. 759 */ 760 VNET_DECLARE(int, drop_synfin); 761 VNET_DECLARE(int, path_mtu_discovery); 762 VNET_DECLARE(int, tcp_abc_l_var); 763 VNET_DECLARE(int, tcp_autorcvbuf_max); 764 VNET_DECLARE(int, tcp_autosndbuf_inc); 765 VNET_DECLARE(int, tcp_autosndbuf_max); 766 VNET_DECLARE(int, tcp_delack_enabled); 767 VNET_DECLARE(int, tcp_do_autorcvbuf); 768 VNET_DECLARE(int, tcp_do_autosndbuf); 769 VNET_DECLARE(int, tcp_do_ecn); 770 VNET_DECLARE(int, tcp_do_rfc1323); 771 VNET_DECLARE(int, tcp_do_rfc3042); 772 VNET_DECLARE(int, tcp_do_rfc3390); 773 VNET_DECLARE(int, tcp_do_rfc3465); 774 VNET_DECLARE(int, tcp_do_rfc6675_pipe); 775 VNET_DECLARE(int, tcp_do_sack); 776 VNET_DECLARE(int, tcp_do_tso); 777 VNET_DECLARE(int, tcp_ecn_maxretries); 778 VNET_DECLARE(int, tcp_initcwnd_segments); 779 VNET_DECLARE(int, tcp_insecure_rst); 780 VNET_DECLARE(int, tcp_insecure_syn); 781 VNET_DECLARE(int, tcp_minmss); 782 VNET_DECLARE(int, tcp_mssdflt); 783 VNET_DECLARE(int, tcp_recvspace); 784 VNET_DECLARE(int, tcp_sack_globalholes); 785 VNET_DECLARE(int, tcp_sack_globalmaxholes); 786 VNET_DECLARE(int, tcp_sack_maxholes); 787 VNET_DECLARE(int, tcp_sc_rst_sock_fail); 788 VNET_DECLARE(int, tcp_sendspace); 789 VNET_DECLARE(struct inpcbhead, tcb); 790 VNET_DECLARE(struct inpcbinfo, tcbinfo); 791 792 #define V_drop_synfin VNET(drop_synfin) 793 #define V_path_mtu_discovery VNET(path_mtu_discovery) 794 #define V_tcb VNET(tcb) 795 #define V_tcbinfo VNET(tcbinfo) 796 #define V_tcp_abc_l_var VNET(tcp_abc_l_var) 797 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max) 798 #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc) 799 #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max) 800 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 801 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf) 802 #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf) 803 #define V_tcp_do_ecn VNET(tcp_do_ecn) 804 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 805 #define V_tcp_ts_offset_per_conn VNET(tcp_ts_offset_per_conn) 806 #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042) 807 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 808 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 809 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe) 810 #define V_tcp_do_sack VNET(tcp_do_sack) 811 #define V_tcp_do_tso VNET(tcp_do_tso) 812 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 813 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments) 814 #define V_tcp_insecure_rst VNET(tcp_insecure_rst) 815 #define V_tcp_insecure_syn VNET(tcp_insecure_syn) 816 #define V_tcp_minmss VNET(tcp_minmss) 817 #define V_tcp_mssdflt VNET(tcp_mssdflt) 818 #define V_tcp_recvspace VNET(tcp_recvspace) 819 #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes) 820 #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes) 821 #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes) 822 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 823 #define V_tcp_sendspace VNET(tcp_sendspace) 824 #define V_tcp_udp_tunneling_overhead VNET(tcp_udp_tunneling_overhead) 825 #define V_tcp_udp_tunneling_port VNET(tcp_udp_tunneling_port) 826 827 828 #ifdef TCP_HHOOK 829 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 830 #define V_tcp_hhh VNET(tcp_hhh) 831 #endif 832 833 int tcp_addoptions(struct tcpopt *, u_char *); 834 int tcp_ccalgounload(struct cc_algo *unload_algo); 835 struct tcpcb * 836 tcp_close(struct tcpcb *); 837 void tcp_discardcb(struct tcpcb *); 838 void tcp_twstart(struct tcpcb *); 839 void tcp_twclose(struct tcptw *, int); 840 void tcp_ctlinput(int, struct sockaddr *, void *); 841 int tcp_ctloutput(struct socket *, struct sockopt *); 842 struct tcpcb * 843 tcp_drop(struct tcpcb *, int); 844 void tcp_drain(void); 845 void tcp_init(void); 846 void tcp_fini(void *); 847 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 848 const void *); 849 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 850 const void *); 851 int tcp_reass(struct tcpcb *, struct tcphdr *, tcp_seq *, int *, struct mbuf *); 852 void tcp_reass_global_init(void); 853 void tcp_reass_flush(struct tcpcb *); 854 void tcp_dooptions(struct tcpopt *, u_char *, int, int); 855 void tcp_dropwithreset(struct mbuf *, struct tcphdr *, 856 struct tcpcb *, int, int); 857 void tcp_pulloutofband(struct socket *, 858 struct tcphdr *, struct mbuf *, int); 859 void tcp_xmit_timer(struct tcpcb *, int); 860 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *); 861 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th, 862 uint16_t nsegs, uint16_t type); 863 void cc_conn_init(struct tcpcb *tp); 864 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th); 865 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 866 #ifdef TCP_HHOOK 867 void hhook_run_tcp_est_in(struct tcpcb *tp, 868 struct tcphdr *th, struct tcpopt *to); 869 #endif 870 871 int tcp_input(struct mbuf **, int *, int); 872 int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *, 873 struct tcpcb *, int); 874 void tcp_do_segment(struct mbuf *, struct tcphdr *, 875 struct socket *, struct tcpcb *, int, int, uint8_t); 876 877 int register_tcp_functions(struct tcp_function_block *blk, int wait); 878 int register_tcp_functions_as_names(struct tcp_function_block *blk, 879 int wait, const char *names[], int *num_names); 880 int register_tcp_functions_as_name(struct tcp_function_block *blk, 881 const char *name, int wait); 882 int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce, 883 bool force); 884 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs); 885 void tcp_switch_back_to_default(struct tcpcb *tp); 886 struct tcp_function_block * 887 find_and_ref_tcp_fb(struct tcp_function_block *fs); 888 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp); 889 890 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 891 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 892 u_int tcp_maxseg(const struct tcpcb *); 893 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 894 struct tcp_ifcap *); 895 void tcp_mss(struct tcpcb *, int); 896 int tcp_mssopt(struct in_conninfo *); 897 struct inpcb * 898 tcp_drop_syn_sent(struct inpcb *, int); 899 struct tcpcb * 900 tcp_newtcpcb(struct inpcb *); 901 int tcp_output(struct tcpcb *); 902 void tcp_state_change(struct tcpcb *, int); 903 void tcp_respond(struct tcpcb *, void *, 904 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 905 void tcp_tw_init(void); 906 #ifdef VIMAGE 907 void tcp_tw_destroy(void); 908 #endif 909 void tcp_tw_zone_change(void); 910 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 911 struct mbuf *, int); 912 void tcp_setpersist(struct tcpcb *); 913 void tcp_slowtimo(void); 914 struct tcptemp * 915 tcpip_maketemplate(struct inpcb *); 916 void tcpip_fillheaders(struct inpcb *, void *, void *); 917 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int); 918 int tcp_timer_suspend(struct tcpcb *, uint32_t); 919 void tcp_timers_unsuspend(struct tcpcb *, uint32_t); 920 int tcp_timer_active(struct tcpcb *, uint32_t); 921 void tcp_timer_stop(struct tcpcb *, uint32_t); 922 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 923 int inp_to_cpuid(struct inpcb *inp); 924 /* 925 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 926 */ 927 void tcp_hc_init(void); 928 #ifdef VIMAGE 929 void tcp_hc_destroy(void); 930 #endif 931 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 932 uint32_t tcp_hc_getmtu(struct in_conninfo *); 933 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t); 934 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 935 936 extern struct pr_usrreqs tcp_usrreqs; 937 938 uint32_t tcp_new_ts_offset(struct in_conninfo *); 939 tcp_seq tcp_new_isn(struct in_conninfo *); 940 941 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 942 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 943 void tcp_clean_dsack_blocks(struct tcpcb *tp); 944 void tcp_clean_sackreport(struct tcpcb *tp); 945 void tcp_sack_adjust(struct tcpcb *tp); 946 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 947 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 948 void tcp_free_sackholes(struct tcpcb *tp); 949 int tcp_newreno(struct tcpcb *, struct tcphdr *); 950 int tcp_compute_pipe(struct tcpcb *); 951 uint32_t tcp_compute_initwnd(uint32_t); 952 void tcp_sndbuf_autoscale(struct tcpcb *, struct socket *, uint32_t); 953 struct mbuf * 954 tcp_m_copym(struct mbuf *m, int32_t off0, int32_t *plen, 955 int32_t seglimit, int32_t segsize, struct sockbuf *sb, bool hw_tls); 956 957 958 static inline void 959 tcp_fields_to_host(struct tcphdr *th) 960 { 961 962 th->th_seq = ntohl(th->th_seq); 963 th->th_ack = ntohl(th->th_ack); 964 th->th_win = ntohs(th->th_win); 965 th->th_urp = ntohs(th->th_urp); 966 } 967 968 static inline void 969 tcp_fields_to_net(struct tcphdr *th) 970 { 971 972 th->th_seq = htonl(th->th_seq); 973 th->th_ack = htonl(th->th_ack); 974 th->th_win = htons(th->th_win); 975 th->th_urp = htons(th->th_urp); 976 } 977 #endif /* _KERNEL */ 978 979 #endif /* _NETINET_TCP_VAR_H_ */ 980