Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet/tcp_var.h
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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 "opt_kern_tls.h" 43 #include <net/vnet.h> 44 #include <sys/mbuf.h> 45 #include <sys/ktls.h> 46 #endif 47 48 #define TCP_END_BYTE_INFO 8 /* Bytes that makeup the "end information array" */ 49 /* Types of ending byte info */ 50 #define TCP_EI_EMPTY_SLOT 0 51 #define TCP_EI_STATUS_CLIENT_FIN 0x1 52 #define TCP_EI_STATUS_CLIENT_RST 0x2 53 #define TCP_EI_STATUS_SERVER_FIN 0x3 54 #define TCP_EI_STATUS_SERVER_RST 0x4 55 #define TCP_EI_STATUS_RETRAN 0x5 56 #define TCP_EI_STATUS_PROGRESS 0x6 57 #define TCP_EI_STATUS_PERSIST_MAX 0x7 58 #define TCP_EI_STATUS_KEEP_MAX 0x8 59 #define TCP_EI_STATUS_DATA_A_CLOSE 0x9 60 #define TCP_EI_STATUS_RST_IN_FRONT 0xa 61 #define TCP_EI_STATUS_2MSL 0xb 62 #define TCP_EI_STATUS_MAX_VALUE 0xb 63 64 /************************************************/ 65 /* Status bits we track to assure no duplicates, 66 * the bits here are not used by the code but 67 * for human representation. To check a bit we 68 * take and shift over by 1 minus the value (1-8). 69 */ 70 /************************************************/ 71 #define TCP_EI_BITS_CLIENT_FIN 0x001 72 #define TCP_EI_BITS_CLIENT_RST 0x002 73 #define TCP_EI_BITS_SERVER_FIN 0x004 74 #define TCP_EI_BITS_SERVER_RST 0x008 75 #define TCP_EI_BITS_RETRAN 0x010 76 #define TCP_EI_BITS_PROGRESS 0x020 77 #define TCP_EI_BITS_PRESIST_MAX 0x040 78 #define TCP_EI_BITS_KEEP_MAX 0x080 79 #define TCP_EI_BITS_DATA_A_CLO 0x100 80 #define TCP_EI_BITS_RST_IN_FR 0x200 /* a front state reset */ 81 #define TCP_EI_BITS_2MS_TIMER 0x400 /* 2 MSL timer expired */ 82 83 #if defined(_KERNEL) || defined(_WANT_TCPCB) 84 #include <netinet/cc/cc.h> 85 86 /* TCP segment queue entry */ 87 struct tseg_qent { 88 TAILQ_ENTRY(tseg_qent) tqe_q; 89 struct mbuf *tqe_m; /* mbuf contains packet */ 90 struct mbuf *tqe_last; /* last mbuf in chain */ 91 tcp_seq tqe_start; /* TCP Sequence number start */ 92 int tqe_len; /* TCP segment data length */ 93 uint32_t tqe_flags; /* The flags from tcp_get_flags() */ 94 uint32_t tqe_mbuf_cnt; /* Count of mbuf overhead */ 95 }; 96 TAILQ_HEAD(tsegqe_head, tseg_qent); 97 98 struct sackblk { 99 tcp_seq start; /* start seq no. of sack block */ 100 tcp_seq end; /* end seq no. */ 101 }; 102 103 struct sackhole { 104 tcp_seq start; /* start seq no. of hole */ 105 tcp_seq end; /* end seq no. */ 106 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 107 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 108 }; 109 110 struct sackhint { 111 struct sackhole *nexthole; 112 int32_t sack_bytes_rexmit; 113 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */ 114 115 int32_t delivered_data; /* Newly acked data from last SACK */ 116 117 int32_t sacked_bytes; /* Total sacked bytes reported by the 118 * receiver via sack option 119 */ 120 uint32_t recover_fs; /* Flight Size at the start of Loss recovery */ 121 uint32_t prr_delivered; /* Total bytes delivered using PRR */ 122 uint32_t prr_out; /* Bytes sent during IN_RECOVERY */ 123 }; 124 125 #define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq) 126 127 STAILQ_HEAD(tcp_log_stailq, tcp_log_mem); 128 129 typedef enum { 130 TT_DELACK = 0, 131 TT_REXMT, 132 TT_PERSIST, 133 TT_KEEP, 134 TT_2MSL, 135 TT_N, 136 } tt_which; 137 138 /* 139 * Tcp control block, one per tcp connection. 140 */ 141 struct tcpcb { 142 struct inpcb t_inpcb; /* embedded protocol indepenent cb */ 143 #define t_start_zero t_fb 144 #define t_zero_size (sizeof(struct tcpcb) - \ 145 offsetof(struct tcpcb, t_start_zero)) 146 struct tcp_function_block *t_fb;/* TCP function call block */ 147 void *t_fb_ptr; /* Pointer to t_fb specific data */ 148 149 struct callout t_callout; 150 sbintime_t t_timers[TT_N]; 151 sbintime_t t_precisions[TT_N]; 152 153 uint32_t t_maxseg:24, /* maximum segment size */ 154 t_logstate:8; /* State of "black box" logging */ 155 uint32_t t_port:16, /* Tunneling (over udp) port */ 156 t_state:4, /* state of this connection */ 157 t_idle_reduce : 1, 158 t_delayed_ack: 7, /* Delayed ack variable */ 159 t_fin_is_rst: 1, /* Are fin's treated as resets */ 160 t_log_state_set: 1, 161 bits_spare : 2; 162 u_int t_flags; 163 tcp_seq snd_una; /* sent but unacknowledged */ 164 tcp_seq snd_max; /* highest sequence number sent; 165 * used to recognize retransmits 166 */ 167 tcp_seq snd_nxt; /* send next */ 168 tcp_seq snd_up; /* send urgent pointer */ 169 uint32_t snd_wnd; /* send window */ 170 uint32_t snd_cwnd; /* congestion-controlled window */ 171 uint32_t t_peakrate_thr; /* pre-calculated peak rate threshold */ 172 uint32_t ts_offset; /* our timestamp offset */ 173 uint32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 174 int rcv_numsacks; /* # distinct sack blks present */ 175 u_int t_tsomax; /* TSO total burst length limit */ 176 u_int t_tsomaxsegcount; /* TSO maximum segment count */ 177 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */ 178 tcp_seq rcv_nxt; /* receive next */ 179 tcp_seq rcv_adv; /* advertised window */ 180 uint32_t rcv_wnd; /* receive window */ 181 u_int t_flags2; /* More tcpcb flags storage */ 182 int t_srtt; /* smoothed round-trip time */ 183 int t_rttvar; /* variance in round-trip time */ 184 uint32_t ts_recent; /* timestamp echo data */ 185 u_char snd_scale; /* window scaling for send window */ 186 u_char rcv_scale; /* window scaling for recv window */ 187 u_char snd_limited; /* segments limited transmitted */ 188 u_char request_r_scale; /* pending window scaling */ 189 tcp_seq last_ack_sent; 190 u_int t_rcvtime; /* inactivity time */ 191 tcp_seq rcv_up; /* receive urgent pointer */ 192 int t_segqlen; /* segment reassembly queue length */ 193 uint32_t t_segqmbuflen; /* total reassembly queue byte length */ 194 struct tsegqe_head t_segq; /* segment reassembly queue */ 195 struct mbuf *t_in_pkt; 196 struct mbuf *t_tail_pkt; 197 uint32_t snd_ssthresh; /* snd_cwnd size threshold for 198 * for slow start exponential to 199 * linear switch 200 */ 201 tcp_seq snd_wl1; /* window update seg seq number */ 202 tcp_seq snd_wl2; /* window update seg ack number */ 203 204 tcp_seq irs; /* initial receive sequence number */ 205 tcp_seq iss; /* initial send sequence number */ 206 u_int t_acktime; /* RACK and BBR incoming new data was acked */ 207 u_int t_sndtime; /* time last data was sent */ 208 u_int ts_recent_age; /* when last updated */ 209 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 210 char t_oobflags; /* have some */ 211 char t_iobc; /* input character */ 212 int t_rxtcur; /* current retransmit value (ticks) */ 213 214 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 215 u_int t_rtttime; /* RTT measurement start time */ 216 217 tcp_seq t_rtseq; /* sequence number being timed */ 218 u_int t_starttime; /* time connection was established */ 219 u_int t_fbyte_in; /* ticks time first byte queued in */ 220 u_int t_fbyte_out; /* ticks time first byte queued out */ 221 222 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */ 223 int t_blackhole_enter; /* when to enter blackhole detection */ 224 int t_blackhole_exit; /* when to exit blackhole detection */ 225 u_int t_rttmin; /* minimum rtt allowed */ 226 227 int t_softerror; /* possible error not yet reported */ 228 uint32_t max_sndwnd; /* largest window peer has offered */ 229 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */ 230 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ 231 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 232 int t_sndzerowin; /* zero-window updates sent */ 233 int snd_numholes; /* number of holes seen by sender */ 234 u_int t_badrxtwin; /* window for retransmit recovery */ 235 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 236 /* SACK scoreboard (sorted) */ 237 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 238 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 239 struct sackhint sackhint; /* SACK scoreboard hint */ 240 int t_rttlow; /* smallest observerved RTT */ 241 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 242 struct toedev *tod; /* toedev handling this connection */ 243 int t_sndrexmitpack; /* retransmit packets sent */ 244 int t_rcvoopack; /* out-of-order packets received */ 245 void *t_toe; /* TOE pcb pointer */ 246 struct cc_algo *t_cc; /* congestion control algorithm */ 247 struct cc_var t_ccv; /* congestion control specific vars */ 248 int t_bytes_acked; /* # bytes acked during current RTT */ 249 u_int t_maxunacktime; 250 u_int t_keepinit; /* time to establish connection */ 251 u_int t_keepidle; /* time before keepalive probes begin */ 252 u_int t_keepintvl; /* interval between keepalives */ 253 u_int t_keepcnt; /* number of keepalives before close */ 254 int t_dupacks; /* consecutive dup acks recd */ 255 int t_lognum; /* Number of log entries */ 256 int t_loglimit; /* Maximum number of log entries */ 257 uint32_t t_rcep; /* Number of received CE marked pkts */ 258 uint32_t t_scep; /* Synced number of delivered CE pkts */ 259 int64_t t_pacing_rate; /* bytes / sec, -1 => unlimited */ 260 struct tcp_log_stailq t_logs; /* Log buffer */ 261 struct tcp_log_id_node *t_lin; 262 struct tcp_log_id_bucket *t_lib; 263 const char *t_output_caller; /* Function that called tcp_output */ 264 struct statsblob *t_stats; /* Per-connection stats */ 265 uint32_t t_logsn; /* Log "serial number" */ 266 uint32_t gput_ts; /* Time goodput measurement started */ 267 tcp_seq gput_seq; /* Outbound measurement seq */ 268 tcp_seq gput_ack; /* Inbound measurement ack */ 269 int32_t t_stats_gput_prev; /* XXXLAS: Prev gput measurement */ 270 uint32_t t_maxpeakrate; /* max peak rate set by user, bytes/s */ 271 uint32_t t_sndtlppack; /* tail loss probe packets sent */ 272 uint64_t t_sndtlpbyte; /* total tail loss probe bytes sent */ 273 uint64_t t_sndbytes; /* total bytes sent */ 274 uint64_t t_snd_rxt_bytes; /* total bytes retransmitted */ 275 uint32_t t_dsack_bytes; /* dsack bytes received */ 276 uint32_t t_dsack_tlp_bytes; /* dsack bytes received for TLPs sent */ 277 uint32_t t_dsack_pack; /* dsack packets we have eceived */ 278 uint8_t t_rttupdated; /* number of times rtt sampled */ 279 /* TCP Fast Open */ 280 uint8_t t_tfo_client_cookie_len; /* TFO client cookie length */ 281 uint32_t t_end_info_status; /* Status flag of end info */ 282 unsigned int *t_tfo_pending; /* TFO server pending counter */ 283 union { 284 uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN]; 285 uint64_t server; 286 } t_tfo_cookie; /* TCP Fast Open cookie to send */ 287 union { 288 uint8_t t_end_info_bytes[TCP_END_BYTE_INFO]; 289 uint64_t t_end_info; 290 }; 291 #ifdef TCPPCAP 292 struct mbufq t_inpkts; /* List of saved input packets. */ 293 struct mbufq t_outpkts; /* List of saved output packets. */ 294 #endif 295 #ifdef TCP_HHOOK 296 struct osd t_osd; /* storage for Khelp module data */ 297 #endif 298 }; 299 #endif /* _KERNEL || _WANT_TCPCB */ 300 301 #ifdef _KERNEL 302 struct tcptemp { 303 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 304 struct tcphdr tt_t; 305 }; 306 307 /* Enable TCP/UDP tunneling port */ 308 #define TCP_TUNNELING_PORT_MIN 0 309 #define TCP_TUNNELING_PORT_MAX 65535 310 #define TCP_TUNNELING_PORT_DEFAULT 0 311 312 /* Enable TCP/UDP tunneling port */ 313 #define TCP_TUNNELING_OVERHEAD_MIN sizeof(struct udphdr) 314 #define TCP_TUNNELING_OVERHEAD_MAX 1024 315 #define TCP_TUNNELING_OVERHEAD_DEFAULT TCP_TUNNELING_OVERHEAD_MIN 316 317 /* Minimum map entries limit value, if set */ 318 #define TCP_MIN_MAP_ENTRIES_LIMIT 128 319 320 /* 321 * TODO: We yet need to brave plowing in 322 * to tcp_input() and the pru_usrreq() block. 323 * Right now these go to the old standards which 324 * are somewhat ok, but in the long term may 325 * need to be changed. If we do tackle tcp_input() 326 * then we need to get rid of the tcp_do_segment() 327 * function below. 328 */ 329 /* Flags for tcp functions */ 330 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */ 331 #define TCP_FUNC_OUTPUT_CANDROP 0x02 /* tfb_tcp_output may ask tcp_drop */ 332 333 /* 334 * If defining the optional tcp_timers, in the 335 * tfb_tcp_timer_stop call you must use the 336 * callout_async_drain() function with the 337 * tcp_timer_discard callback. You should check 338 * the return of callout_async_drain() and if 0 339 * increment tt_draincnt. Since the timer sub-system 340 * does not know your callbacks you must provide a 341 * stop_all function that loops through and calls 342 * tcp_timer_stop() with each of your defined timers. 343 * Adding a tfb_tcp_handoff_ok function allows the socket 344 * option to change stacks to query you even if the 345 * connection is in a later stage. You return 0 to 346 * say you can take over and run your stack, you return 347 * non-zero (an error number) to say no you can't. 348 * If the function is undefined you can only change 349 * in the early states (before connect or listen). 350 * tfb_tcp_fb_fini is changed to add a flag to tell 351 * the old stack if the tcb is being destroyed or 352 * not. A one in the flag means the TCB is being 353 * destroyed, a zero indicates its transitioning to 354 * another stack (via socket option). 355 */ 356 struct tcp_function_block { 357 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX]; 358 int (*tfb_tcp_output)(struct tcpcb *); 359 int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *); 360 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *, 361 struct socket *, struct tcpcb *, 362 int, int, uint8_t); 363 int (*tfb_do_queued_segments)(struct socket *, struct tcpcb *, int); 364 int (*tfb_do_segment_nounlock)(struct mbuf *, struct tcphdr *, 365 struct socket *, struct tcpcb *, 366 int, int, uint8_t, 367 int, struct timeval *); 368 void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *, 369 struct socket *, struct tcpcb *, 370 int, int, uint8_t, 371 int, struct timeval *); 372 int (*tfb_tcp_ctloutput)(struct inpcb *inp, struct sockopt *sopt); 373 /* Optional memory allocation/free routine */ 374 int (*tfb_tcp_fb_init)(struct tcpcb *); 375 void (*tfb_tcp_fb_fini)(struct tcpcb *, int); 376 /* Optional timers, must define all if you define one */ 377 int (*tfb_tcp_timer_stop_all)(struct tcpcb *); 378 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *); 379 int (*tfb_tcp_handoff_ok)(struct tcpcb *); 380 void (*tfb_tcp_mtu_chg)(struct tcpcb *); 381 int (*tfb_pru_options)(struct tcpcb *, int); 382 void (*tfb_hwtls_change)(struct tcpcb *, int); 383 int (*tfb_compute_pipe)(struct tcpcb *tp); 384 volatile uint32_t tfb_refcnt; 385 uint32_t tfb_flags; 386 uint8_t tfb_id; 387 }; 388 389 struct tcp_function { 390 TAILQ_ENTRY(tcp_function) tf_next; 391 char tf_name[TCP_FUNCTION_NAME_LEN_MAX]; 392 struct tcp_function_block *tf_fb; 393 }; 394 395 TAILQ_HEAD(tcp_funchead, tcp_function); 396 397 struct tcpcb * tcp_drop(struct tcpcb *, int); 398 399 #ifdef _NETINET_IN_PCB_H_ 400 #define intotcpcb(inp) __containerof((inp), struct tcpcb, t_inpcb) 401 #define sototcpcb(so) intotcpcb(sotoinpcb(so)) 402 #define tptoinpcb(tp) (&(tp)->t_inpcb) 403 #define tptosocket(tp) (tp)->t_inpcb.inp_socket 404 405 /* 406 * tcp_output() 407 * Handles tcp_drop request from advanced stacks and reports that inpcb is 408 * gone with negative return code. 409 * Drop in replacement for the default stack. 410 */ 411 static inline int 412 tcp_output(struct tcpcb *tp) 413 { 414 struct inpcb *inp = tptoinpcb(tp); 415 int rv; 416 417 INP_WLOCK_ASSERT(inp); 418 419 rv = tp->t_fb->tfb_tcp_output(tp); 420 if (rv < 0) { 421 KASSERT(tp->t_fb->tfb_flags & TCP_FUNC_OUTPUT_CANDROP, 422 ("TCP stack %s requested tcp_drop(%p)", 423 tp->t_fb->tfb_tcp_block_name, tp)); 424 tp = tcp_drop(tp, -rv); 425 if (tp) 426 INP_WUNLOCK(inp); 427 } 428 429 return (rv); 430 } 431 432 /* 433 * tcp_output_unlock() 434 * Always returns unlocked, handles drop request from advanced stacks. 435 * Always returns positive error code. 436 */ 437 static inline int 438 tcp_output_unlock(struct tcpcb *tp) 439 { 440 struct inpcb *inp = tptoinpcb(tp); 441 int rv; 442 443 INP_WLOCK_ASSERT(inp); 444 445 rv = tp->t_fb->tfb_tcp_output(tp); 446 if (rv < 0) { 447 KASSERT(tp->t_fb->tfb_flags & TCP_FUNC_OUTPUT_CANDROP, 448 ("TCP stack %s requested tcp_drop(%p)", 449 tp->t_fb->tfb_tcp_block_name, tp)); 450 rv = -rv; 451 tp = tcp_drop(tp, rv); 452 if (tp) 453 INP_WUNLOCK(inp); 454 } else 455 INP_WUNLOCK(inp); 456 457 return (rv); 458 } 459 460 /* 461 * tcp_output_nodrop() 462 * Always returns locked. It is caller's responsibility to run tcp_drop()! 463 * Useful in syscall implementations, when we want to perform some logging 464 * and/or tracing with tcpcb before calling tcp_drop(). To be used with 465 * tcp_unlock_or_drop() later. 466 * 467 * XXXGL: maybe don't allow stacks to return a drop request at certain 468 * TCP states? Why would it do in connect(2)? In recv(2)? 469 */ 470 static inline int 471 tcp_output_nodrop(struct tcpcb *tp) 472 { 473 int rv; 474 475 INP_WLOCK_ASSERT(tptoinpcb(tp)); 476 477 rv = tp->t_fb->tfb_tcp_output(tp); 478 KASSERT(rv >= 0 || tp->t_fb->tfb_flags & TCP_FUNC_OUTPUT_CANDROP, 479 ("TCP stack %s requested tcp_drop(%p)", 480 tp->t_fb->tfb_tcp_block_name, tp)); 481 return (rv); 482 } 483 484 /* 485 * tcp_unlock_or_drop() 486 * Handle return code from tfb_tcp_output() after we have logged/traced, 487 * to be used with tcp_output_nodrop(). 488 */ 489 static inline int 490 tcp_unlock_or_drop(struct tcpcb *tp, int tcp_output_retval) 491 { 492 struct inpcb *inp = tptoinpcb(tp); 493 494 INP_WLOCK_ASSERT(inp); 495 496 if (tcp_output_retval < 0) { 497 tcp_output_retval = -tcp_output_retval; 498 if (tcp_drop(tp, tcp_output_retval) != NULL) 499 INP_WUNLOCK(inp); 500 } else 501 INP_WUNLOCK(inp); 502 503 return (tcp_output_retval); 504 } 505 #endif /* _NETINET_IN_PCB_H_ */ 506 507 static int inline 508 tcp_packets_this_ack(struct tcpcb *tp, tcp_seq ack) 509 { 510 return ((ack - tp->snd_una) / tp->t_maxseg + 511 ((((ack - tp->snd_una) % tp->t_maxseg) != 0) ? 1 : 0)); 512 } 513 #endif /* _KERNEL */ 514 515 /* 516 * Flags and utility macros for the t_flags field. 517 */ 518 #define TF_ACKNOW 0x00000001 /* ack peer immediately */ 519 #define TF_DELACK 0x00000002 /* ack, but try to delay it */ 520 #define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */ 521 #define TF_NOOPT 0x00000008 /* don't use tcp options */ 522 #define TF_SENTFIN 0x00000010 /* have sent FIN */ 523 #define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */ 524 #define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */ 525 #define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */ 526 #define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */ 527 #define TF_SACK_PERMIT 0x00000200 /* other side said I could SACK */ 528 #define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */ 529 #define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */ 530 #define TF_NOPUSH 0x00001000 /* don't push */ 531 #define TF_PREVVALID 0x00002000 /* saved values for bad rxmit valid 532 * Note: accessing and restoring from 533 * these may only be done in the 1st 534 * RTO recovery round (t_rxtshift == 1) 535 */ 536 #define TF_WAKESOR 0x00004000 /* wake up receive socket */ 537 #define TF_GPUTINPROG 0x00008000 /* Goodput measurement in progress */ 538 #define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */ 539 #define TF_SONOTCONN 0x00020000 /* needs soisconnected() on ESTAB */ 540 #define TF_LASTIDLE 0x00040000 /* connection was previously idle */ 541 #define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */ 542 #define TF_FASTRECOVERY 0x00100000 /* in NewReno Fast Recovery */ 543 #define TF_WASFRECOVERY 0x00200000 /* was in NewReno Fast Recovery */ 544 #define TF_SIGNATURE 0x00400000 /* require MD5 digests (RFC2385) */ 545 #define TF_FORCEDATA 0x00800000 /* force out a byte */ 546 #define TF_TSO 0x01000000 /* TSO enabled on this connection */ 547 #define TF_TOE 0x02000000 /* this connection is offloaded */ 548 #define TF_CLOSED 0x04000000 /* close(2) called on socket */ 549 #define TF_UNUSED1 0x08000000 /* unused */ 550 #define TF_LRD 0x10000000 /* Lost Retransmission Detection */ 551 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 552 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 553 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */ 554 555 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 556 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 557 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 558 559 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 560 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 561 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 562 563 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 564 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 565 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 566 567 #if defined(_KERNEL) && !defined(TCP_RFC7413) 568 #define IS_FASTOPEN(t_flags) (false) 569 #else 570 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN) 571 #endif 572 573 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 574 575 /* 576 * Flags for the t_oobflags field. 577 */ 578 #define TCPOOB_HAVEDATA 0x01 579 #define TCPOOB_HADDATA 0x02 580 581 /* 582 * Flags for the extended TCP flags field, t_flags2 583 */ 584 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */ 585 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */ 586 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */ 587 #define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */ 588 #define TF2_DROP_AF_DATA 0x00000010 /* Drop after all data ack'd */ 589 #define TF2_ECN_PERMIT 0x00000020 /* connection ECN-ready */ 590 #define TF2_ECN_SND_CWR 0x00000040 /* ECN CWR in queue */ 591 #define TF2_ECN_SND_ECE 0x00000080 /* ECN ECE in queue */ 592 #define TF2_ACE_PERMIT 0x00000100 /* Accurate ECN mode */ 593 #define TF2_FBYTES_COMPLETE 0x00000400 /* We have first bytes in and out */ 594 #define TF2_ECN_USE_ECT1 0x00000800 /* Use ECT(1) marking on session */ 595 596 /* 597 * Structure to hold TCP options that are only used during segment 598 * processing (in tcp_input), but not held in the tcpcb. 599 * It's basically used to reduce the number of parameters 600 * to tcp_dooptions and tcp_addoptions. 601 * The binary order of the to_flags is relevant for packing of the 602 * options in tcp_addoptions. 603 */ 604 struct tcpopt { 605 u_int32_t to_flags; /* which options are present */ 606 #define TOF_MSS 0x0001 /* maximum segment size */ 607 #define TOF_SCALE 0x0002 /* window scaling */ 608 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 609 #define TOF_TS 0x0010 /* timestamp */ 610 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 611 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 612 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */ 613 #define TOF_MAXOPT 0x0200 614 u_int32_t to_tsval; /* new timestamp */ 615 u_int32_t to_tsecr; /* reflected timestamp */ 616 u_char *to_sacks; /* pointer to the first SACK blocks */ 617 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 618 u_int8_t *to_tfo_cookie; /* pointer to the TFO cookie */ 619 u_int16_t to_mss; /* maximum segment size */ 620 u_int8_t to_wscale; /* window scaling */ 621 u_int8_t to_nsacks; /* number of SACK blocks */ 622 u_int8_t to_tfo_len; /* TFO cookie length */ 623 u_int32_t to_spare; /* UTO */ 624 }; 625 626 /* 627 * Flags for tcp_dooptions. 628 */ 629 #define TO_SYN 0x01 /* parse SYN-only options */ 630 631 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 632 uint32_t rmx_mtu; /* MTU for this path */ 633 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */ 634 uint32_t rmx_rtt; /* estimated round trip time */ 635 uint32_t rmx_rttvar; /* estimated rtt variance */ 636 uint32_t rmx_cwnd; /* congestion window */ 637 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */ 638 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */ 639 }; 640 641 /* 642 * Used by tcp_maxmtu() to communicate interface specific features 643 * and limits at the time of connection setup. 644 */ 645 struct tcp_ifcap { 646 int ifcap; 647 u_int tsomax; 648 u_int tsomaxsegcount; 649 u_int tsomaxsegsize; 650 }; 651 652 #ifndef _NETINET_IN_PCB_H_ 653 struct in_conninfo; 654 #endif /* _NETINET_IN_PCB_H_ */ 655 656 /* 657 * The smoothed round-trip time and estimated variance 658 * are stored as fixed point numbers scaled by the values below. 659 * For convenience, these scales are also used in smoothing the average 660 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 661 * With these scales, srtt has 3 bits to the right of the binary point, 662 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 663 * binary point, and is smoothed with an ALPHA of 0.75. 664 */ 665 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 666 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 667 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 668 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 669 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 670 671 /* 672 * The initial retransmission should happen at rtt + 4 * rttvar. 673 * Because of the way we do the smoothing, srtt and rttvar 674 * will each average +1/2 tick of bias. When we compute 675 * the retransmit timer, we want 1/2 tick of rounding and 676 * 1 extra tick because of +-1/2 tick uncertainty in the 677 * firing of the timer. The bias will give us exactly the 678 * 1.5 tick we need. But, because the bias is 679 * statistical, we have to test that we don't drop below 680 * the minimum feasible timer (which is 2 ticks). 681 * This version of the macro adapted from a paper by Lawrence 682 * Brakmo and Larry Peterson which outlines a problem caused 683 * by insufficient precision in the original implementation, 684 * which results in inappropriately large RTO values for very 685 * fast networks. 686 */ 687 #define TCP_REXMTVAL(tp) \ 688 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 689 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 690 691 /* 692 * TCP statistics. 693 * Many of these should be kept per connection, 694 * but that's inconvenient at the moment. 695 */ 696 struct tcpstat { 697 uint64_t tcps_connattempt; /* connections initiated */ 698 uint64_t tcps_accepts; /* connections accepted */ 699 uint64_t tcps_connects; /* connections established */ 700 uint64_t tcps_drops; /* connections dropped */ 701 uint64_t tcps_conndrops; /* embryonic connections dropped */ 702 uint64_t tcps_minmssdrops; /* average minmss too low drops */ 703 uint64_t tcps_closed; /* conn. closed (includes drops) */ 704 uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 705 uint64_t tcps_rttupdated; /* times we succeeded */ 706 uint64_t tcps_delack; /* delayed acks sent */ 707 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 708 uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 709 uint64_t tcps_persisttimeo; /* persist timeouts */ 710 uint64_t tcps_keeptimeo; /* keepalive timeouts */ 711 uint64_t tcps_keepprobe; /* keepalive probes sent */ 712 uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 713 uint64_t tcps_progdrops; /* drops due to no progress */ 714 715 uint64_t tcps_sndtotal; /* total packets sent */ 716 uint64_t tcps_sndpack; /* data packets sent */ 717 uint64_t tcps_sndbyte; /* data bytes sent */ 718 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 719 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 720 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 721 uint64_t tcps_sndacks; /* ack-only packets sent */ 722 uint64_t tcps_sndprobe; /* window probes sent */ 723 uint64_t tcps_sndurg; /* packets sent with URG only */ 724 uint64_t tcps_sndwinup; /* window update-only packets sent */ 725 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 726 727 uint64_t tcps_rcvtotal; /* total packets received */ 728 uint64_t tcps_rcvpack; /* packets received in sequence */ 729 uint64_t tcps_rcvbyte; /* bytes received in sequence */ 730 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 731 uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 732 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */ 733 uint64_t tcps_rcvshort; /* packets received too short */ 734 uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 735 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 736 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 737 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 738 uint64_t tcps_rcvoopack; /* out-of-order packets received */ 739 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 740 uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 741 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 742 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 743 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 744 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 745 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 746 uint64_t tcps_rcvackpack; /* rcvd ack packets */ 747 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 748 uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 749 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 750 uint64_t tcps_predack; /* times hdr predict ok for acks */ 751 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 752 uint64_t tcps_pcbcachemiss; 753 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 754 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 755 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 756 uint64_t tcps_usedrtt; /* times RTT initialized from route */ 757 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 758 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 759 uint64_t tcps_persistdrop; /* timeout in persist state */ 760 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 761 uint64_t tcps_mturesent; /* resends due to MTU discovery */ 762 uint64_t tcps_listendrop; /* listen queue overflows */ 763 uint64_t tcps_badrst; /* ignored RSTs in the window */ 764 765 uint64_t tcps_sc_added; /* entry added to syncache */ 766 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 767 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 768 uint64_t tcps_sc_dropped; /* could not reply to packet */ 769 uint64_t tcps_sc_completed; /* successful extraction of entry */ 770 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 771 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 772 uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 773 uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 774 uint64_t tcps_sc_aborted; /* syncache entry aborted */ 775 uint64_t tcps_sc_badack; /* removed due to bad ACK */ 776 uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 777 uint64_t tcps_sc_zonefail; /* zalloc() failed */ 778 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 779 uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 780 781 uint64_t tcps_hc_added; /* entry added to hostcache */ 782 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 783 784 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 785 786 /* SACK related stats */ 787 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 788 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 789 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 790 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 791 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 792 uint64_t tcps_sack_lostrexmt; /* SACK lost retransmission recovered */ 793 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 794 795 /* ECN related stats */ 796 uint64_t tcps_ecn_rcvce; /* ECN Congestion Experienced */ 797 uint64_t tcps_ecn_rcvect0; /* ECN Capable Transport */ 798 uint64_t tcps_ecn_rcvect1; /* ECN Capable Transport */ 799 uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 800 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 801 802 /* TCP_SIGNATURE related stats */ 803 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 804 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 805 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */ 806 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 807 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 808 809 /* Path MTU Discovery Black Hole Detection related stats */ 810 uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */ 811 uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */ 812 uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */ 813 814 uint64_t tcps_tunneled_pkts; /* Packets encap's in UDP received */ 815 uint64_t tcps_tunneled_errs; /* Packets that had errors that were UDP encaped */ 816 817 /* Dsack related stats */ 818 uint64_t tcps_dsack_count; /* Number of ACKs arriving with DSACKs */ 819 uint64_t tcps_dsack_bytes; /* Number of bytes DSACK'ed no TLP */ 820 uint64_t tcps_dsack_tlp_bytes; /* Number of bytes DSACK'ed due to TLPs */ 821 822 /* TCPS_TIME_WAIT usage stats */ 823 uint64_t tcps_tw_recycles; /* Times time-wait was recycled. */ 824 uint64_t tcps_tw_resets; /* Times time-wait sent a reset. */ 825 uint64_t tcps_tw_responds; /* Times time-wait sent a valid ack. */ 826 827 /* Accurate ECN Handshake stats */ 828 uint64_t tcps_ace_nect; /* ACE SYN packet with Non-ECT */ 829 uint64_t tcps_ace_ect1; /* ACE SYN packet with ECT1 */ 830 uint64_t tcps_ace_ect0; /* ACE SYN packet with ECT0 */ 831 uint64_t tcps_ace_ce; /* ACE SYN packet with CE */ 832 833 /* ECN related stats */ 834 uint64_t tcps_ecn_sndect0; /* ECN Capable Transport */ 835 uint64_t tcps_ecn_sndect1; /* ECN Capable Transport */ 836 837 uint64_t _pad[4]; /* 4 TBD placeholder for STABLE */ 838 }; 839 840 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */ 841 842 #ifdef _KERNEL 843 #define TI_UNLOCKED 1 844 #define TI_RLOCKED 2 845 #include <sys/counter.h> 846 847 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 848 /* 849 * In-kernel consumers can use these accessor macros directly to update 850 * stats. 851 */ 852 #define TCPSTAT_ADD(name, val) \ 853 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val)) 854 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 855 856 /* 857 * Kernel module consumers must use this accessor macro. 858 */ 859 void kmod_tcpstat_add(int statnum, int val); 860 #define KMOD_TCPSTAT_ADD(name, val) \ 861 kmod_tcpstat_add(offsetof(struct tcpstat, name) / sizeof(uint64_t), val) 862 #define KMOD_TCPSTAT_INC(name) KMOD_TCPSTAT_ADD(name, 1) 863 864 /* 865 * Running TCP connection count by state. 866 */ 867 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]); 868 #define V_tcps_states VNET(tcps_states) 869 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1) 870 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1) 871 872 /* 873 * TCP specific helper hook point identifiers. 874 */ 875 #define HHOOK_TCP_EST_IN 0 876 #define HHOOK_TCP_EST_OUT 1 877 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 878 879 struct tcp_hhook_data { 880 struct tcpcb *tp; 881 struct tcphdr *th; 882 struct tcpopt *to; 883 uint32_t len; 884 int tso; 885 tcp_seq curack; 886 }; 887 #ifdef TCP_HHOOK 888 void hhook_run_tcp_est_out(struct tcpcb *tp, 889 struct tcphdr *th, struct tcpopt *to, 890 uint32_t len, int tso); 891 #endif 892 #endif 893 894 /* 895 * TCB structure exported to user-land via sysctl(3). 896 * 897 * Fields prefixed with "xt_" are unique to the export structure, and fields 898 * with "t_" or other prefixes match corresponding fields of 'struct tcpcb'. 899 * 900 * Legend: 901 * (s) - used by userland utilities in src 902 * (p) - used by utilities in ports 903 * (3) - is known to be used by third party software not in ports 904 * (n) - no known usage 905 * 906 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 907 * included. Not all of our clients do. 908 */ 909 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 910 struct xtcpcb { 911 ksize_t xt_len; /* length of this structure */ 912 struct xinpcb xt_inp; 913 char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */ 914 char xt_logid[TCP_LOG_ID_LEN]; /* (s) */ 915 char xt_cc[TCP_CA_NAME_MAX]; /* (s) */ 916 int64_t spare64[6]; 917 int32_t t_state; /* (s,p) */ 918 uint32_t t_flags; /* (s,p) */ 919 int32_t t_sndzerowin; /* (s) */ 920 int32_t t_sndrexmitpack; /* (s) */ 921 int32_t t_rcvoopack; /* (s) */ 922 int32_t t_rcvtime; /* (s) */ 923 int32_t tt_rexmt; /* (s) */ 924 int32_t tt_persist; /* (s) */ 925 int32_t tt_keep; /* (s) */ 926 int32_t tt_2msl; /* (s) */ 927 int32_t tt_delack; /* (s) */ 928 int32_t t_logstate; /* (3) */ 929 uint32_t t_snd_cwnd; /* (s) */ 930 uint32_t t_snd_ssthresh; /* (s) */ 931 uint32_t t_maxseg; /* (s) */ 932 uint32_t t_rcv_wnd; /* (s) */ 933 uint32_t t_snd_wnd; /* (s) */ 934 uint32_t xt_ecn; /* (s) */ 935 uint32_t t_dsack_bytes; /* (n) */ 936 uint32_t t_dsack_tlp_bytes; /* (n) */ 937 uint32_t t_dsack_pack; /* (n) */ 938 uint16_t xt_encaps_port; /* (s) */ 939 int16_t spare16; 940 int32_t spare32[22]; 941 } __aligned(8); 942 943 #ifdef _KERNEL 944 void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *); 945 #endif 946 #endif 947 948 /* 949 * TCP function information (name-to-id mapping, aliases, and refcnt) 950 * exported to user-land via sysctl(3). 951 */ 952 struct tcp_function_info { 953 uint32_t tfi_refcnt; 954 uint8_t tfi_id; 955 char tfi_name[TCP_FUNCTION_NAME_LEN_MAX]; 956 char tfi_alias[TCP_FUNCTION_NAME_LEN_MAX]; 957 }; 958 959 /* 960 * Identifiers for TCP sysctl nodes 961 */ 962 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 963 #define TCPCTL_MSSDFLT 3 /* MSS default */ 964 #define TCPCTL_STATS 4 /* statistics */ 965 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 966 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 967 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 968 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 969 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 970 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 971 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 972 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 973 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 974 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 975 #define TCPCTL_DROP 15 /* drop tcp connection */ 976 #define TCPCTL_STATES 16 /* connection counts by TCP state */ 977 978 #ifdef _KERNEL 979 #ifdef SYSCTL_DECL 980 SYSCTL_DECL(_net_inet_tcp); 981 SYSCTL_DECL(_net_inet_tcp_sack); 982 MALLOC_DECLARE(M_TCPLOG); 983 #endif 984 985 VNET_DECLARE(int, tcp_log_in_vain); 986 #define V_tcp_log_in_vain VNET(tcp_log_in_vain) 987 988 /* 989 * Global TCP tunables shared between different stacks. 990 * Please keep the list sorted. 991 */ 992 VNET_DECLARE(int, drop_synfin); 993 VNET_DECLARE(int, path_mtu_discovery); 994 VNET_DECLARE(int, tcp_abc_l_var); 995 VNET_DECLARE(int, tcp_autorcvbuf_max); 996 VNET_DECLARE(int, tcp_autosndbuf_inc); 997 VNET_DECLARE(int, tcp_autosndbuf_max); 998 VNET_DECLARE(int, tcp_delack_enabled); 999 VNET_DECLARE(int, tcp_do_autorcvbuf); 1000 VNET_DECLARE(int, tcp_do_autosndbuf); 1001 VNET_DECLARE(int, tcp_do_ecn); 1002 VNET_DECLARE(int, tcp_do_lrd); 1003 VNET_DECLARE(int, tcp_do_prr); 1004 VNET_DECLARE(int, tcp_do_prr_conservative); 1005 VNET_DECLARE(int, tcp_do_newcwv); 1006 VNET_DECLARE(int, tcp_do_rfc1323); 1007 VNET_DECLARE(int, tcp_tolerate_missing_ts); 1008 VNET_DECLARE(int, tcp_do_rfc3042); 1009 VNET_DECLARE(int, tcp_do_rfc3390); 1010 VNET_DECLARE(int, tcp_do_rfc3465); 1011 VNET_DECLARE(int, tcp_do_newsack); 1012 VNET_DECLARE(int, tcp_do_sack); 1013 VNET_DECLARE(int, tcp_do_tso); 1014 VNET_DECLARE(int, tcp_ecn_maxretries); 1015 VNET_DECLARE(int, tcp_initcwnd_segments); 1016 VNET_DECLARE(int, tcp_insecure_rst); 1017 VNET_DECLARE(int, tcp_insecure_syn); 1018 VNET_DECLARE(uint32_t, tcp_map_entries_limit); 1019 VNET_DECLARE(uint32_t, tcp_map_split_limit); 1020 VNET_DECLARE(int, tcp_minmss); 1021 VNET_DECLARE(int, tcp_mssdflt); 1022 #ifdef STATS 1023 VNET_DECLARE(int, tcp_perconn_stats_dflt_tpl); 1024 VNET_DECLARE(int, tcp_perconn_stats_enable); 1025 #endif /* STATS */ 1026 VNET_DECLARE(int, tcp_recvspace); 1027 VNET_DECLARE(int, tcp_sack_globalholes); 1028 VNET_DECLARE(int, tcp_sack_globalmaxholes); 1029 VNET_DECLARE(int, tcp_sack_maxholes); 1030 VNET_DECLARE(int, tcp_sc_rst_sock_fail); 1031 VNET_DECLARE(int, tcp_sendspace); 1032 VNET_DECLARE(int, tcp_udp_tunneling_overhead); 1033 VNET_DECLARE(int, tcp_udp_tunneling_port); 1034 VNET_DECLARE(struct inpcbinfo, tcbinfo); 1035 1036 #define V_tcp_do_lrd VNET(tcp_do_lrd) 1037 #define V_tcp_do_prr VNET(tcp_do_prr) 1038 #define V_tcp_do_prr_conservative VNET(tcp_do_prr_conservative) 1039 #define V_tcp_do_newcwv VNET(tcp_do_newcwv) 1040 #define V_drop_synfin VNET(drop_synfin) 1041 #define V_path_mtu_discovery VNET(path_mtu_discovery) 1042 #define V_tcbinfo VNET(tcbinfo) 1043 #define V_tcp_abc_l_var VNET(tcp_abc_l_var) 1044 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max) 1045 #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc) 1046 #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max) 1047 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 1048 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf) 1049 #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf) 1050 #define V_tcp_do_ecn VNET(tcp_do_ecn) 1051 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 1052 #define V_tcp_tolerate_missing_ts VNET(tcp_tolerate_missing_ts) 1053 #define V_tcp_ts_offset_per_conn VNET(tcp_ts_offset_per_conn) 1054 #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042) 1055 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 1056 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 1057 #define V_tcp_do_newsack VNET(tcp_do_newsack) 1058 #define V_tcp_do_sack VNET(tcp_do_sack) 1059 #define V_tcp_do_tso VNET(tcp_do_tso) 1060 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 1061 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments) 1062 #define V_tcp_insecure_rst VNET(tcp_insecure_rst) 1063 #define V_tcp_insecure_syn VNET(tcp_insecure_syn) 1064 #define V_tcp_map_entries_limit VNET(tcp_map_entries_limit) 1065 #define V_tcp_map_split_limit VNET(tcp_map_split_limit) 1066 #define V_tcp_minmss VNET(tcp_minmss) 1067 #define V_tcp_mssdflt VNET(tcp_mssdflt) 1068 #ifdef STATS 1069 #define V_tcp_perconn_stats_dflt_tpl VNET(tcp_perconn_stats_dflt_tpl) 1070 #define V_tcp_perconn_stats_enable VNET(tcp_perconn_stats_enable) 1071 #endif /* STATS */ 1072 #define V_tcp_recvspace VNET(tcp_recvspace) 1073 #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes) 1074 #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes) 1075 #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes) 1076 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 1077 #define V_tcp_sendspace VNET(tcp_sendspace) 1078 #define V_tcp_udp_tunneling_overhead VNET(tcp_udp_tunneling_overhead) 1079 #define V_tcp_udp_tunneling_port VNET(tcp_udp_tunneling_port) 1080 1081 #ifdef TCP_HHOOK 1082 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 1083 #define V_tcp_hhh VNET(tcp_hhh) 1084 #endif 1085 1086 int tcp_addoptions(struct tcpopt *, u_char *); 1087 struct tcpcb * 1088 tcp_close(struct tcpcb *); 1089 void tcp_discardcb(struct tcpcb *); 1090 void tcp_twstart(struct tcpcb *); 1091 int tcp_ctloutput(struct socket *, struct sockopt *); 1092 void tcp_fini(void *); 1093 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, const void *, 1094 const void *); 1095 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, const void *, 1096 const void *); 1097 int tcp_reass(struct tcpcb *, struct tcphdr *, tcp_seq *, int *, 1098 struct mbuf *); 1099 void tcp_reass_global_init(void); 1100 void tcp_reass_flush(struct tcpcb *); 1101 void tcp_dooptions(struct tcpopt *, u_char *, int, int); 1102 void tcp_dropwithreset(struct mbuf *, struct tcphdr *, 1103 struct tcpcb *, int, int); 1104 void tcp_pulloutofband(struct socket *, 1105 struct tcphdr *, struct mbuf *, int); 1106 void tcp_xmit_timer(struct tcpcb *, int); 1107 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *); 1108 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th, 1109 uint16_t nsegs, uint16_t type); 1110 void cc_conn_init(struct tcpcb *tp); 1111 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th); 1112 void cc_ecnpkt_handler(struct tcpcb *tp, struct tcphdr *th, uint8_t iptos); 1113 void cc_ecnpkt_handler_flags(struct tcpcb *tp, uint16_t flags, uint8_t iptos); 1114 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 1115 #ifdef TCP_HHOOK 1116 void hhook_run_tcp_est_in(struct tcpcb *tp, 1117 struct tcphdr *th, struct tcpopt *to); 1118 #endif 1119 1120 int tcp_input(struct mbuf **, int *, int); 1121 int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *, 1122 struct tcpcb *, int); 1123 int tcp_input_with_port(struct mbuf **, int *, int, uint16_t); 1124 void tcp_do_segment(struct mbuf *, struct tcphdr *, 1125 struct socket *, struct tcpcb *, int, int, uint8_t); 1126 1127 int register_tcp_functions(struct tcp_function_block *blk, int wait); 1128 int register_tcp_functions_as_names(struct tcp_function_block *blk, 1129 int wait, const char *names[], int *num_names); 1130 int register_tcp_functions_as_name(struct tcp_function_block *blk, 1131 const char *name, int wait); 1132 int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce, 1133 bool force); 1134 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs); 1135 int find_tcp_function_alias(struct tcp_function_block *blk, struct tcp_function_set *fs); 1136 void tcp_switch_back_to_default(struct tcpcb *tp); 1137 struct tcp_function_block * 1138 find_and_ref_tcp_fb(struct tcp_function_block *fs); 1139 int tcp_default_ctloutput(struct inpcb *inp, struct sockopt *sopt); 1140 int tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt); 1141 1142 extern counter_u64_t tcp_inp_lro_direct_queue; 1143 extern counter_u64_t tcp_inp_lro_wokeup_queue; 1144 extern counter_u64_t tcp_inp_lro_compressed; 1145 extern counter_u64_t tcp_inp_lro_locks_taken; 1146 extern counter_u64_t tcp_extra_mbuf; 1147 extern counter_u64_t tcp_would_have_but; 1148 extern counter_u64_t tcp_comp_total; 1149 extern counter_u64_t tcp_uncomp_total; 1150 extern counter_u64_t tcp_bad_csums; 1151 1152 #ifdef NETFLIX_EXP_DETECTION 1153 /* Various SACK attack thresholds */ 1154 extern int32_t tcp_force_detection; 1155 extern int32_t tcp_sack_to_ack_thresh; 1156 extern int32_t tcp_sack_to_move_thresh; 1157 extern int32_t tcp_restoral_thresh; 1158 extern int32_t tcp_sad_decay_val; 1159 extern int32_t tcp_sad_pacing_interval; 1160 extern int32_t tcp_sad_low_pps; 1161 extern int32_t tcp_map_minimum; 1162 extern int32_t tcp_attack_on_turns_on_logging; 1163 #endif 1164 extern uint32_t tcp_ack_war_time_window; 1165 extern uint32_t tcp_ack_war_cnt; 1166 1167 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 1168 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 1169 void tcp6_use_min_mtu(struct tcpcb *); 1170 u_int tcp_maxseg(const struct tcpcb *); 1171 u_int tcp_fixed_maxseg(const struct tcpcb *); 1172 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 1173 struct tcp_ifcap *); 1174 void tcp_mss(struct tcpcb *, int); 1175 int tcp_mssopt(struct in_conninfo *); 1176 struct tcpcb * 1177 tcp_newtcpcb(struct inpcb *); 1178 int tcp_default_output(struct tcpcb *); 1179 void tcp_state_change(struct tcpcb *, int); 1180 void tcp_respond(struct tcpcb *, void *, 1181 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, uint16_t); 1182 bool tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 1183 struct mbuf *, int); 1184 void tcp_setpersist(struct tcpcb *); 1185 void tcp_record_dsack(struct tcpcb *tp, tcp_seq start, tcp_seq end, int tlp); 1186 struct tcptemp * 1187 tcpip_maketemplate(struct inpcb *); 1188 void tcpip_fillheaders(struct inpcb *, uint16_t, void *, void *); 1189 void tcp_timer_activate(struct tcpcb *, tt_which, u_int); 1190 bool tcp_timer_active(struct tcpcb *, tt_which); 1191 void tcp_timer_stop(struct tcpcb *); 1192 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 1193 int inp_to_cpuid(struct inpcb *inp); 1194 /* 1195 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 1196 */ 1197 void tcp_hc_init(void); 1198 #ifdef VIMAGE 1199 void tcp_hc_destroy(void); 1200 #endif 1201 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 1202 uint32_t tcp_hc_getmtu(struct in_conninfo *); 1203 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t); 1204 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 1205 void cc_after_idle(struct tcpcb *tp); 1206 1207 extern struct protosw tcp_protosw; /* shared for TOE */ 1208 extern struct protosw tcp6_protosw; /* shared for TOE */ 1209 1210 uint32_t tcp_new_ts_offset(struct in_conninfo *); 1211 tcp_seq tcp_new_isn(struct in_conninfo *); 1212 1213 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 1214 int tcp_dsack_block_exists(struct tcpcb *); 1215 void tcp_update_dsack_list(struct tcpcb *, tcp_seq, tcp_seq); 1216 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 1217 void tcp_clean_dsack_blocks(struct tcpcb *tp); 1218 void tcp_clean_sackreport(struct tcpcb *tp); 1219 void tcp_sack_adjust(struct tcpcb *tp); 1220 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 1221 void tcp_do_prr_ack(struct tcpcb *, struct tcphdr *, struct tcpopt *); 1222 void tcp_lost_retransmission(struct tcpcb *, struct tcphdr *); 1223 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 1224 void tcp_free_sackholes(struct tcpcb *tp); 1225 void tcp_sack_lost_retransmission(struct tcpcb *, struct tcphdr *); 1226 int tcp_newreno(struct tcpcb *, struct tcphdr *); 1227 int tcp_compute_pipe(struct tcpcb *); 1228 uint32_t tcp_compute_initwnd(uint32_t); 1229 void tcp_sndbuf_autoscale(struct tcpcb *, struct socket *, uint32_t); 1230 int tcp_stats_sample_rollthedice(struct tcpcb *tp, void *seed_bytes, 1231 size_t seed_len); 1232 int tcp_can_enable_pacing(void); 1233 void tcp_decrement_paced_conn(void); 1234 1235 struct mbuf * 1236 tcp_m_copym(struct mbuf *m, int32_t off0, int32_t *plen, 1237 int32_t seglimit, int32_t segsize, struct sockbuf *sb, bool hw_tls); 1238 1239 int tcp_stats_init(void); 1240 void tcp_log_end_status(struct tcpcb *tp, uint8_t status); 1241 1242 static inline void 1243 tcp_fields_to_host(struct tcphdr *th) 1244 { 1245 1246 th->th_seq = ntohl(th->th_seq); 1247 th->th_ack = ntohl(th->th_ack); 1248 th->th_win = ntohs(th->th_win); 1249 th->th_urp = ntohs(th->th_urp); 1250 } 1251 1252 static inline void 1253 tcp_fields_to_net(struct tcphdr *th) 1254 { 1255 1256 th->th_seq = htonl(th->th_seq); 1257 th->th_ack = htonl(th->th_ack); 1258 th->th_win = htons(th->th_win); 1259 th->th_urp = htons(th->th_urp); 1260 } 1261 1262 static inline uint16_t 1263 tcp_get_flags(const struct tcphdr *th) 1264 { 1265 return (((uint16_t)th->th_x2 << 8) | th->th_flags); 1266 } 1267 1268 static inline void 1269 tcp_set_flags(struct tcphdr *th, uint16_t flags) 1270 { 1271 th->th_x2 = (flags >> 8) & 0x0f; 1272 th->th_flags = flags & 0xff; 1273 } 1274 1275 static inline void 1276 tcp_account_for_send(struct tcpcb *tp, uint32_t len, uint8_t is_rxt, 1277 uint8_t is_tlp, int hw_tls) 1278 { 1279 if (is_tlp) { 1280 tp->t_sndtlppack++; 1281 tp->t_sndtlpbyte += len; 1282 } 1283 /* To get total bytes sent you must add t_snd_rxt_bytes to t_sndbytes */ 1284 if (is_rxt) 1285 tp->t_snd_rxt_bytes += len; 1286 else 1287 tp->t_sndbytes += len; 1288 1289 #ifdef KERN_TLS 1290 if (hw_tls && is_rxt && len != 0) { 1291 uint64_t rexmit_percent = (1000ULL * tp->t_snd_rxt_bytes) / (10ULL * (tp->t_snd_rxt_bytes + tp->t_sndbytes)); 1292 if (rexmit_percent > ktls_ifnet_max_rexmit_pct) 1293 ktls_disable_ifnet(tp); 1294 } 1295 #endif 1296 1297 } 1298 #endif /* _KERNEL */ 1299 1300 #endif /* _NETINET_TCP_VAR_H_ */
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