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 #define TCP_END_BYTE_INFO 8 /* Bytes that makeup the "end information array" */ 47 /* Types of ending byte info */ 48 #define TCP_EI_EMPTY_SLOT 0 49 #define TCP_EI_STATUS_CLIENT_FIN 0x1 50 #define TCP_EI_STATUS_CLIENT_RST 0x2 51 #define TCP_EI_STATUS_SERVER_FIN 0x3 52 #define TCP_EI_STATUS_SERVER_RST 0x4 53 #define TCP_EI_STATUS_RETRAN 0x5 54 #define TCP_EI_STATUS_PROGRESS 0x6 55 #define TCP_EI_STATUS_PERSIST_MAX 0x7 56 #define TCP_EI_STATUS_KEEP_MAX 0x8 57 #define TCP_EI_STATUS_DATA_A_CLOSE 0x9 58 #define TCP_EI_STATUS_RST_IN_FRONT 0xa 59 #define TCP_EI_STATUS_2MSL 0xb 60 #define TCP_EI_STATUS_MAX_VALUE 0xb 61 62 /************************************************/ 63 /* Status bits we track to assure no duplicates, 64 * the bits here are not used by the code but 65 * for human representation. To check a bit we 66 * take and shift over by 1 minus the value (1-8). 67 */ 68 /************************************************/ 69 #define TCP_EI_BITS_CLIENT_FIN 0x001 70 #define TCP_EI_BITS_CLIENT_RST 0x002 71 #define TCP_EI_BITS_SERVER_FIN 0x004 72 #define TCP_EI_BITS_SERVER_RST 0x008 73 #define TCP_EI_BITS_RETRAN 0x010 74 #define TCP_EI_BITS_PROGRESS 0x020 75 #define TCP_EI_BITS_PRESIST_MAX 0x040 76 #define TCP_EI_BITS_KEEP_MAX 0x080 77 #define TCP_EI_BITS_DATA_A_CLO 0x100 78 #define TCP_EI_BITS_RST_IN_FR 0x200 /* a front state reset */ 79 #define TCP_EI_BITS_2MS_TIMER 0x400 /* 2 MSL timer expired */ 80 81 #if defined(_KERNEL) || defined(_WANT_TCPCB) 82 /* TCP segment queue entry */ 83 struct tseg_qent { 84 TAILQ_ENTRY(tseg_qent) tqe_q; 85 struct mbuf *tqe_m; /* mbuf contains packet */ 86 struct mbuf *tqe_last; /* last mbuf in chain */ 87 tcp_seq tqe_start; /* TCP Sequence number start */ 88 int tqe_len; /* TCP segment data length */ 89 uint32_t tqe_flags; /* The flags from the th->th_flags */ 90 uint32_t tqe_mbuf_cnt; /* Count of mbuf overhead */ 91 }; 92 TAILQ_HEAD(tsegqe_head, tseg_qent); 93 94 struct sackblk { 95 tcp_seq start; /* start seq no. of sack block */ 96 tcp_seq end; /* end seq no. */ 97 }; 98 99 struct sackhole { 100 tcp_seq start; /* start seq no. of hole */ 101 tcp_seq end; /* end seq no. */ 102 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 103 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 104 }; 105 106 struct sackhint { 107 struct sackhole *nexthole; 108 int sack_bytes_rexmit; 109 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */ 110 111 int ispare; /* explicit pad for 64bit alignment */ 112 int sacked_bytes; /* 113 * Total sacked bytes reported by the 114 * receiver via sack option 115 */ 116 uint32_t _pad1[1]; /* TBD */ 117 uint64_t _pad[1]; /* TBD */ 118 }; 119 120 #define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq) 121 122 STAILQ_HEAD(tcp_log_stailq, tcp_log_mem); 123 124 /* 125 * Tcp control block, one per tcp; fields: 126 * Organized for 64 byte cacheline efficiency based 127 * on common tcp_input/tcp_output processing. 128 */ 129 struct tcpcb { 130 /* Cache line 1 */ 131 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 132 struct tcp_function_block *t_fb;/* TCP function call block */ 133 void *t_fb_ptr; /* Pointer to t_fb specific data */ 134 uint32_t t_maxseg:24, /* maximum segment size */ 135 t_logstate:8; /* State of "black box" logging */ 136 uint32_t t_port:16, /* Tunneling (over udp) port */ 137 t_state:4, /* state of this connection */ 138 t_idle_reduce : 1, 139 t_delayed_ack: 7, /* Delayed ack variable */ 140 t_fin_is_rst: 1, /* Are fin's treated as resets */ 141 t_log_state_set: 1, 142 bits_spare : 2; 143 u_int t_flags; 144 tcp_seq snd_una; /* sent but unacknowledged */ 145 tcp_seq snd_max; /* highest sequence number sent; 146 * used to recognize retransmits 147 */ 148 tcp_seq snd_nxt; /* send next */ 149 tcp_seq snd_up; /* send urgent pointer */ 150 uint32_t snd_wnd; /* send window */ 151 uint32_t snd_cwnd; /* congestion-controlled window */ 152 uint32_t t_peakrate_thr; /* pre-calculated peak rate threshold */ 153 /* Cache line 2 */ 154 u_int32_t ts_offset; /* our timestamp offset */ 155 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 156 int rcv_numsacks; /* # distinct sack blks present */ 157 u_int t_tsomax; /* TSO total burst length limit in bytes */ 158 u_int t_tsomaxsegcount; /* TSO maximum segment count */ 159 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */ 160 tcp_seq rcv_nxt; /* receive next */ 161 tcp_seq rcv_adv; /* advertised window */ 162 uint32_t rcv_wnd; /* receive window */ 163 u_int t_flags2; /* More tcpcb flags storage */ 164 int t_srtt; /* smoothed round-trip time */ 165 int t_rttvar; /* variance in round-trip time */ 166 u_int32_t ts_recent; /* timestamp echo data */ 167 u_char snd_scale; /* window scaling for send window */ 168 u_char rcv_scale; /* window scaling for recv window */ 169 u_char snd_limited; /* segments limited transmitted */ 170 u_char request_r_scale; /* pending window scaling */ 171 tcp_seq last_ack_sent; 172 u_int t_rcvtime; /* inactivity time */ 173 /* Cache line 3 */ 174 tcp_seq rcv_up; /* receive urgent pointer */ 175 int t_segqlen; /* segment reassembly queue length */ 176 uint32_t t_segqmbuflen; /* Count of bytes mbufs on all entries */ 177 struct tsegqe_head t_segq; /* segment reassembly queue */ 178 struct mbuf *t_in_pkt; 179 struct mbuf *t_tail_pkt; 180 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 181 struct vnet *t_vnet; /* back pointer to parent vnet */ 182 uint32_t snd_ssthresh; /* snd_cwnd size threshold for 183 * for slow start exponential to 184 * linear switch 185 */ 186 tcp_seq snd_wl1; /* window update seg seq number */ 187 /* Cache line 4 */ 188 tcp_seq snd_wl2; /* window update seg ack number */ 189 190 tcp_seq irs; /* initial receive sequence number */ 191 tcp_seq iss; /* initial send sequence number */ 192 u_int t_acktime; /* RACK and BBR incoming new data was acked */ 193 u_int t_sndtime; /* time last data was sent */ 194 u_int ts_recent_age; /* when last updated */ 195 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 196 uint16_t cl4_spare; /* Spare to adjust CL 4 */ 197 char t_oobflags; /* have some */ 198 char t_iobc; /* input character */ 199 int t_rxtcur; /* current retransmit value (ticks) */ 200 201 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 202 u_int t_rtttime; /* RTT measurement start time */ 203 204 tcp_seq t_rtseq; /* sequence number being timed */ 205 u_int t_starttime; /* time connection was established */ 206 u_int t_fbyte_in; /* ticks time when first byte queued in */ 207 u_int t_fbyte_out; /* ticks time when first byte queued out */ 208 209 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */ 210 int t_blackhole_enter; /* when to enter blackhole detection */ 211 int t_blackhole_exit; /* when to exit blackhole detection */ 212 u_int t_rttmin; /* minimum rtt allowed */ 213 214 u_int t_rttbest; /* best rtt we've seen */ 215 216 int t_softerror; /* possible error not yet reported */ 217 uint32_t max_sndwnd; /* largest window peer has offered */ 218 /* Cache line 5 */ 219 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */ 220 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ 221 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 222 int t_sndzerowin; /* zero-window updates sent */ 223 u_long t_rttupdated; /* number of times rtt sampled */ 224 int snd_numholes; /* number of holes seen by sender */ 225 u_int t_badrxtwin; /* window for retransmit recovery */ 226 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 227 /* SACK scoreboard (sorted) */ 228 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 229 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 230 struct sackhint sackhint; /* SACK scoreboard hint */ 231 int t_rttlow; /* smallest observerved RTT */ 232 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 233 struct toedev *tod; /* toedev handling this connection */ 234 int t_sndrexmitpack; /* retransmit packets sent */ 235 int t_rcvoopack; /* out-of-order packets received */ 236 void *t_toe; /* TOE pcb pointer */ 237 struct cc_algo *cc_algo; /* congestion control algorithm */ 238 struct cc_var *ccv; /* congestion control specific vars */ 239 struct osd *osd; /* storage for Khelp module data */ 240 int t_bytes_acked; /* # bytes acked during current RTT */ 241 u_int t_maxunacktime; 242 u_int t_keepinit; /* time to establish connection */ 243 u_int t_keepidle; /* time before keepalive probes begin */ 244 u_int t_keepintvl; /* interval between keepalives */ 245 u_int t_keepcnt; /* number of keepalives before close */ 246 int t_dupacks; /* consecutive dup acks recd */ 247 int t_lognum; /* Number of log entries */ 248 int t_loglimit; /* Maximum number of log entries */ 249 struct tcp_log_stailq t_logs; /* Log buffer */ 250 struct tcp_log_id_node *t_lin; 251 struct tcp_log_id_bucket *t_lib; 252 const char *t_output_caller; /* Function that called tcp_output */ 253 struct statsblob *t_stats; /* Per-connection stats */ 254 uint32_t t_logsn; /* Log "serial number" */ 255 uint32_t gput_ts; /* Time goodput measurement started */ 256 tcp_seq gput_seq; /* Outbound measurement seq */ 257 tcp_seq gput_ack; /* Inbound measurement ack */ 258 int32_t t_stats_gput_prev; /* XXXLAS: Prev gput measurement */ 259 uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */ 260 uint32_t t_end_info_status; /* Status flag of end info */ 261 unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */ 262 union { 263 uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN]; 264 uint64_t server; 265 } t_tfo_cookie; /* TCP Fast Open cookie to send */ 266 union { 267 uint8_t t_end_info_bytes[TCP_END_BYTE_INFO]; 268 uint64_t t_end_info; 269 }; 270 #ifdef TCPPCAP 271 struct mbufq t_inpkts; /* List of saved input packets. */ 272 struct mbufq t_outpkts; /* List of saved output packets. */ 273 #endif 274 }; 275 #endif /* _KERNEL || _WANT_TCPCB */ 276 277 #ifdef _KERNEL 278 struct tcptemp { 279 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 280 struct tcphdr tt_t; 281 }; 282 283 /* Minimum map entries limit value, if set */ 284 #define TCP_MIN_MAP_ENTRIES_LIMIT 128 285 286 /* 287 * TODO: We yet need to brave plowing in 288 * to tcp_input() and the pru_usrreq() block. 289 * Right now these go to the old standards which 290 * are somewhat ok, but in the long term may 291 * need to be changed. If we do tackle tcp_input() 292 * then we need to get rid of the tcp_do_segment() 293 * function below. 294 */ 295 /* Flags for tcp functions */ 296 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */ 297 298 /* 299 * If defining the optional tcp_timers, in the 300 * tfb_tcp_timer_stop call you must use the 301 * callout_async_drain() function with the 302 * tcp_timer_discard callback. You should check 303 * the return of callout_async_drain() and if 0 304 * increment tt_draincnt. Since the timer sub-system 305 * does not know your callbacks you must provide a 306 * stop_all function that loops through and calls 307 * tcp_timer_stop() with each of your defined timers. 308 * Adding a tfb_tcp_handoff_ok function allows the socket 309 * option to change stacks to query you even if the 310 * connection is in a later stage. You return 0 to 311 * say you can take over and run your stack, you return 312 * non-zero (an error number) to say no you can't. 313 * If the function is undefined you can only change 314 * in the early states (before connect or listen). 315 * tfb_tcp_fb_fini is changed to add a flag to tell 316 * the old stack if the tcb is being destroyed or 317 * not. A one in the flag means the TCB is being 318 * destroyed, a zero indicates its transitioning to 319 * another stack (via socket option). 320 */ 321 struct tcp_function_block { 322 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX]; 323 int (*tfb_tcp_output)(struct tcpcb *); 324 int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *); 325 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *, 326 struct socket *, struct tcpcb *, 327 int, int, uint8_t); 328 int (*tfb_do_queued_segments)(struct socket *, struct tcpcb *, int); 329 int (*tfb_do_segment_nounlock)(struct mbuf *, struct tcphdr *, 330 struct socket *, struct tcpcb *, 331 int, int, uint8_t, 332 int, struct timeval *); 333 void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *, 334 struct socket *, struct tcpcb *, 335 int, int, uint8_t, 336 int, struct timeval *); 337 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt, 338 struct inpcb *inp, struct tcpcb *tp); 339 /* Optional memory allocation/free routine */ 340 int (*tfb_tcp_fb_init)(struct tcpcb *); 341 void (*tfb_tcp_fb_fini)(struct tcpcb *, int); 342 /* Optional timers, must define all if you define one */ 343 int (*tfb_tcp_timer_stop_all)(struct tcpcb *); 344 void (*tfb_tcp_timer_activate)(struct tcpcb *, 345 uint32_t, u_int); 346 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t); 347 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t); 348 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *); 349 int (*tfb_tcp_handoff_ok)(struct tcpcb *); 350 void (*tfb_tcp_mtu_chg)(struct tcpcb *); 351 int (*tfb_pru_options)(struct tcpcb *, int); 352 volatile uint32_t tfb_refcnt; 353 uint32_t tfb_flags; 354 uint8_t tfb_id; 355 }; 356 357 struct tcp_function { 358 TAILQ_ENTRY(tcp_function) tf_next; 359 char tf_name[TCP_FUNCTION_NAME_LEN_MAX]; 360 struct tcp_function_block *tf_fb; 361 }; 362 363 TAILQ_HEAD(tcp_funchead, tcp_function); 364 #endif /* _KERNEL */ 365 366 /* 367 * Flags and utility macros for the t_flags field. 368 */ 369 #define TF_ACKNOW 0x00000001 /* ack peer immediately */ 370 #define TF_DELACK 0x00000002 /* ack, but try to delay it */ 371 #define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */ 372 #define TF_NOOPT 0x00000008 /* don't use tcp options */ 373 #define TF_SENTFIN 0x00000010 /* have sent FIN */ 374 #define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */ 375 #define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */ 376 #define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */ 377 #define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */ 378 #define TF_SACK_PERMIT 0x00000200 /* other side said I could SACK */ 379 #define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */ 380 #define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */ 381 #define TF_NOPUSH 0x00001000 /* don't push */ 382 #define TF_PREVVALID 0x00002000 /* saved values for bad rxmit valid */ 383 #define TF_UNUSED1 0x00004000 /* unused */ 384 #define TF_GPUTINPROG 0x00008000 /* Goodput measurement in progress */ 385 #define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */ 386 #define TF_LQ_OVERFLOW 0x00020000 /* listen queue overflow */ 387 #define TF_LASTIDLE 0x00040000 /* connection was previously idle */ 388 #define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */ 389 #define TF_FASTRECOVERY 0x00100000 /* in NewReno Fast Recovery */ 390 #define TF_WASFRECOVERY 0x00200000 /* was in NewReno Fast Recovery */ 391 #define TF_SIGNATURE 0x00400000 /* require MD5 digests (RFC2385) */ 392 #define TF_FORCEDATA 0x00800000 /* force out a byte */ 393 #define TF_TSO 0x01000000 /* TSO enabled on this connection */ 394 #define TF_TOE 0x02000000 /* this connection is offloaded */ 395 #define TF_UNUSED3 0x04000000 /* unused */ 396 #define TF_UNUSED4 0x08000000 /* unused */ 397 #define TF_UNUSED5 0x10000000 /* unused */ 398 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 399 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 400 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */ 401 402 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 403 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 404 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 405 406 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 407 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 408 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 409 410 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 411 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 412 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 413 414 #if defined(_KERNEL) && !defined(TCP_RFC7413) 415 #define IS_FASTOPEN(t_flags) (false) 416 #else 417 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN) 418 #endif 419 420 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 421 422 /* 423 * Flags for the t_oobflags field. 424 */ 425 #define TCPOOB_HAVEDATA 0x01 426 #define TCPOOB_HADDATA 0x02 427 428 /* 429 * Flags for the extended TCP flags field, t_flags2 430 */ 431 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */ 432 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */ 433 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */ 434 #define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */ 435 #define TF2_DROP_AF_DATA 0x00000010 /* Drop after all data ack'd */ 436 #define TF2_ECN_PERMIT 0x00000020 /* connection ECN-ready */ 437 #define TF2_ECN_SND_CWR 0x00000040 /* ECN CWR in queue */ 438 #define TF2_ECN_SND_ECE 0x00000080 /* ECN ECE in queue */ 439 #define TF2_ACE_PERMIT 0x00000100 /* Accurate ECN mode */ 440 #define TF2_FBYTES_COMPLETE 0x00000400 /* We have first bytes in and out */ 441 /* 442 * Structure to hold TCP options that are only used during segment 443 * processing (in tcp_input), but not held in the tcpcb. 444 * It's basically used to reduce the number of parameters 445 * to tcp_dooptions and tcp_addoptions. 446 * The binary order of the to_flags is relevant for packing of the 447 * options in tcp_addoptions. 448 */ 449 struct tcpopt { 450 u_int32_t to_flags; /* which options are present */ 451 #define TOF_MSS 0x0001 /* maximum segment size */ 452 #define TOF_SCALE 0x0002 /* window scaling */ 453 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 454 #define TOF_TS 0x0010 /* timestamp */ 455 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 456 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 457 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */ 458 #define TOF_MAXOPT 0x0200 459 u_int32_t to_tsval; /* new timestamp */ 460 u_int32_t to_tsecr; /* reflected timestamp */ 461 u_char *to_sacks; /* pointer to the first SACK blocks */ 462 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 463 u_int8_t *to_tfo_cookie; /* pointer to the TFO cookie */ 464 u_int16_t to_mss; /* maximum segment size */ 465 u_int8_t to_wscale; /* window scaling */ 466 u_int8_t to_nsacks; /* number of SACK blocks */ 467 u_int8_t to_tfo_len; /* TFO cookie length */ 468 u_int32_t to_spare; /* UTO */ 469 }; 470 471 /* 472 * Flags for tcp_dooptions. 473 */ 474 #define TO_SYN 0x01 /* parse SYN-only options */ 475 476 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 477 uint32_t rmx_mtu; /* MTU for this path */ 478 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */ 479 uint32_t rmx_rtt; /* estimated round trip time */ 480 uint32_t rmx_rttvar; /* estimated rtt variance */ 481 uint32_t rmx_cwnd; /* congestion window */ 482 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */ 483 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */ 484 }; 485 486 /* 487 * Used by tcp_maxmtu() to communicate interface specific features 488 * and limits at the time of connection setup. 489 */ 490 struct tcp_ifcap { 491 int ifcap; 492 u_int tsomax; 493 u_int tsomaxsegcount; 494 u_int tsomaxsegsize; 495 }; 496 497 #ifndef _NETINET_IN_PCB_H_ 498 struct in_conninfo; 499 #endif /* _NETINET_IN_PCB_H_ */ 500 501 struct tcptw { 502 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 503 tcp_seq snd_nxt; 504 tcp_seq rcv_nxt; 505 tcp_seq iss; 506 tcp_seq irs; 507 u_short last_win; /* cached window value */ 508 short tw_so_options; /* copy of so_options */ 509 struct ucred *tw_cred; /* user credentials */ 510 u_int32_t t_recent; 511 u_int32_t ts_offset; /* our timestamp offset */ 512 u_int t_starttime; 513 int tw_time; 514 TAILQ_ENTRY(tcptw) tw_2msl; 515 void *tw_pspare; /* TCP_SIGNATURE */ 516 u_int *tw_spare; /* TCP_SIGNATURE */ 517 }; 518 519 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 520 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 521 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 522 523 /* 524 * The smoothed round-trip time and estimated variance 525 * are stored as fixed point numbers scaled by the values below. 526 * For convenience, these scales are also used in smoothing the average 527 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 528 * With these scales, srtt has 3 bits to the right of the binary point, 529 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 530 * binary point, and is smoothed with an ALPHA of 0.75. 531 */ 532 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 533 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 534 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 535 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 536 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 537 538 /* 539 * The initial retransmission should happen at rtt + 4 * rttvar. 540 * Because of the way we do the smoothing, srtt and rttvar 541 * will each average +1/2 tick of bias. When we compute 542 * the retransmit timer, we want 1/2 tick of rounding and 543 * 1 extra tick because of +-1/2 tick uncertainty in the 544 * firing of the timer. The bias will give us exactly the 545 * 1.5 tick we need. But, because the bias is 546 * statistical, we have to test that we don't drop below 547 * the minimum feasible timer (which is 2 ticks). 548 * This version of the macro adapted from a paper by Lawrence 549 * Brakmo and Larry Peterson which outlines a problem caused 550 * by insufficient precision in the original implementation, 551 * which results in inappropriately large RTO values for very 552 * fast networks. 553 */ 554 #define TCP_REXMTVAL(tp) \ 555 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 556 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 557 558 /* 559 * TCP statistics. 560 * Many of these should be kept per connection, 561 * but that's inconvenient at the moment. 562 */ 563 struct tcpstat { 564 uint64_t tcps_connattempt; /* connections initiated */ 565 uint64_t tcps_accepts; /* connections accepted */ 566 uint64_t tcps_connects; /* connections established */ 567 uint64_t tcps_drops; /* connections dropped */ 568 uint64_t tcps_conndrops; /* embryonic connections dropped */ 569 uint64_t tcps_minmssdrops; /* average minmss too low drops */ 570 uint64_t tcps_closed; /* conn. closed (includes drops) */ 571 uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 572 uint64_t tcps_rttupdated; /* times we succeeded */ 573 uint64_t tcps_delack; /* delayed acks sent */ 574 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 575 uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 576 uint64_t tcps_persisttimeo; /* persist timeouts */ 577 uint64_t tcps_keeptimeo; /* keepalive timeouts */ 578 uint64_t tcps_keepprobe; /* keepalive probes sent */ 579 uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 580 581 uint64_t tcps_sndtotal; /* total packets sent */ 582 uint64_t tcps_sndpack; /* data packets sent */ 583 uint64_t tcps_sndbyte; /* data bytes sent */ 584 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 585 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 586 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 587 uint64_t tcps_sndacks; /* ack-only packets sent */ 588 uint64_t tcps_sndprobe; /* window probes sent */ 589 uint64_t tcps_sndurg; /* packets sent with URG only */ 590 uint64_t tcps_sndwinup; /* window update-only packets sent */ 591 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 592 593 uint64_t tcps_rcvtotal; /* total packets received */ 594 uint64_t tcps_rcvpack; /* packets received in sequence */ 595 uint64_t tcps_rcvbyte; /* bytes received in sequence */ 596 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 597 uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 598 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */ 599 uint64_t tcps_rcvshort; /* packets received too short */ 600 uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 601 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 602 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 603 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 604 uint64_t tcps_rcvoopack; /* out-of-order packets received */ 605 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 606 uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 607 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 608 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 609 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 610 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 611 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 612 uint64_t tcps_rcvackpack; /* rcvd ack packets */ 613 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 614 uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 615 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 616 uint64_t tcps_predack; /* times hdr predict ok for acks */ 617 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 618 uint64_t tcps_pcbcachemiss; 619 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 620 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 621 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 622 uint64_t tcps_usedrtt; /* times RTT initialized from route */ 623 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 624 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 625 uint64_t tcps_persistdrop; /* timeout in persist state */ 626 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 627 uint64_t tcps_mturesent; /* resends due to MTU discovery */ 628 uint64_t tcps_listendrop; /* listen queue overflows */ 629 uint64_t tcps_badrst; /* ignored RSTs in the window */ 630 631 uint64_t tcps_sc_added; /* entry added to syncache */ 632 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 633 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 634 uint64_t tcps_sc_dropped; /* could not reply to packet */ 635 uint64_t tcps_sc_completed; /* successful extraction of entry */ 636 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 637 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 638 uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 639 uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 640 uint64_t tcps_sc_aborted; /* syncache entry aborted */ 641 uint64_t tcps_sc_badack; /* removed due to bad ACK */ 642 uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 643 uint64_t tcps_sc_zonefail; /* zalloc() failed */ 644 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 645 uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 646 647 uint64_t tcps_hc_added; /* entry added to hostcache */ 648 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 649 650 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 651 652 /* SACK related stats */ 653 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 654 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 655 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 656 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 657 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 658 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 659 660 /* ECN related stats */ 661 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */ 662 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */ 663 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */ 664 uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 665 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 666 667 /* TCP_SIGNATURE related stats */ 668 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 669 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 670 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */ 671 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 672 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 673 674 /* Path MTU Discovery Black Hole Detection related stats */ 675 uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */ 676 uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */ 677 uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */ 678 679 uint64_t _pad[12]; /* 6 UTO, 6 TBD */ 680 }; 681 682 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */ 683 684 #ifdef _KERNEL 685 #define TI_UNLOCKED 1 686 #define TI_RLOCKED 2 687 #include <sys/counter.h> 688 689 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 690 /* 691 * In-kernel consumers can use these accessor macros directly to update 692 * stats. 693 */ 694 #define TCPSTAT_ADD(name, val) \ 695 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val)) 696 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 697 698 /* 699 * Kernel module consumers must use this accessor macro. 700 */ 701 void kmod_tcpstat_add(int statnum, int val); 702 #define KMOD_TCPSTAT_ADD(name, val) \ 703 kmod_tcpstat_add(offsetof(struct tcpstat, name) / sizeof(uint64_t), val) 704 #define KMOD_TCPSTAT_INC(name) KMOD_TCPSTAT_ADD(name, 1) 705 706 /* 707 * Running TCP connection count by state. 708 */ 709 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]); 710 #define V_tcps_states VNET(tcps_states) 711 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1) 712 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1) 713 714 /* 715 * TCP specific helper hook point identifiers. 716 */ 717 #define HHOOK_TCP_EST_IN 0 718 #define HHOOK_TCP_EST_OUT 1 719 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 720 721 struct tcp_hhook_data { 722 struct tcpcb *tp; 723 struct tcphdr *th; 724 struct tcpopt *to; 725 uint32_t len; 726 int tso; 727 tcp_seq curack; 728 }; 729 #ifdef TCP_HHOOK 730 void hhook_run_tcp_est_out(struct tcpcb *tp, 731 struct tcphdr *th, struct tcpopt *to, 732 uint32_t len, int tso); 733 #endif 734 #endif 735 736 /* 737 * TCB structure exported to user-land via sysctl(3). 738 * 739 * Fields prefixed with "xt_" are unique to the export structure, and fields 740 * with "t_" or other prefixes match corresponding fields of 'struct tcpcb'. 741 * 742 * Legend: 743 * (s) - used by userland utilities in src 744 * (p) - used by utilities in ports 745 * (3) - is known to be used by third party software not in ports 746 * (n) - no known usage 747 * 748 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 749 * included. Not all of our clients do. 750 */ 751 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 752 struct xtcpcb { 753 ksize_t xt_len; /* length of this structure */ 754 struct xinpcb xt_inp; 755 char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */ 756 char xt_logid[TCP_LOG_ID_LEN]; /* (s) */ 757 int64_t spare64[8]; 758 int32_t t_state; /* (s,p) */ 759 uint32_t t_flags; /* (s,p) */ 760 int32_t t_sndzerowin; /* (s) */ 761 int32_t t_sndrexmitpack; /* (s) */ 762 int32_t t_rcvoopack; /* (s) */ 763 int32_t t_rcvtime; /* (s) */ 764 int32_t tt_rexmt; /* (s) */ 765 int32_t tt_persist; /* (s) */ 766 int32_t tt_keep; /* (s) */ 767 int32_t tt_2msl; /* (s) */ 768 int32_t tt_delack; /* (s) */ 769 int32_t t_logstate; /* (3) */ 770 int32_t spare32[32]; 771 } __aligned(8); 772 773 #ifdef _KERNEL 774 void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *); 775 #endif 776 #endif 777 778 /* 779 * TCP function information (name-to-id mapping, aliases, and refcnt) 780 * exported to user-land via sysctl(3). 781 */ 782 struct tcp_function_info { 783 uint32_t tfi_refcnt; 784 uint8_t tfi_id; 785 char tfi_name[TCP_FUNCTION_NAME_LEN_MAX]; 786 char tfi_alias[TCP_FUNCTION_NAME_LEN_MAX]; 787 }; 788 789 /* 790 * Identifiers for TCP sysctl nodes 791 */ 792 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 793 #define TCPCTL_MSSDFLT 3 /* MSS default */ 794 #define TCPCTL_STATS 4 /* statistics */ 795 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 796 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 797 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 798 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 799 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 800 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 801 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 802 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 803 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 804 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 805 #define TCPCTL_DROP 15 /* drop tcp connection */ 806 #define TCPCTL_STATES 16 /* connection counts by TCP state */ 807 808 #ifdef _KERNEL 809 #ifdef SYSCTL_DECL 810 SYSCTL_DECL(_net_inet_tcp); 811 SYSCTL_DECL(_net_inet_tcp_sack); 812 MALLOC_DECLARE(M_TCPLOG); 813 #endif 814 815 VNET_DECLARE(int, tcp_log_in_vain); 816 #define V_tcp_log_in_vain VNET(tcp_log_in_vain) 817 818 /* 819 * Global TCP tunables shared between different stacks. 820 * Please keep the list sorted. 821 */ 822 VNET_DECLARE(int, drop_synfin); 823 VNET_DECLARE(int, path_mtu_discovery); 824 VNET_DECLARE(int, tcp_abc_l_var); 825 VNET_DECLARE(int, tcp_autorcvbuf_max); 826 VNET_DECLARE(int, tcp_autosndbuf_inc); 827 VNET_DECLARE(int, tcp_autosndbuf_max); 828 VNET_DECLARE(int, tcp_delack_enabled); 829 VNET_DECLARE(int, tcp_do_autorcvbuf); 830 VNET_DECLARE(int, tcp_do_autosndbuf); 831 VNET_DECLARE(int, tcp_do_ecn); 832 VNET_DECLARE(int, tcp_do_newcwv); 833 VNET_DECLARE(int, tcp_do_rfc1323); 834 VNET_DECLARE(int, tcp_do_rfc3042); 835 VNET_DECLARE(int, tcp_do_rfc3390); 836 VNET_DECLARE(int, tcp_do_rfc3465); 837 VNET_DECLARE(int, tcp_do_rfc6675_pipe); 838 VNET_DECLARE(int, tcp_do_sack); 839 VNET_DECLARE(int, tcp_do_tso); 840 VNET_DECLARE(int, tcp_ecn_maxretries); 841 VNET_DECLARE(int, tcp_initcwnd_segments); 842 VNET_DECLARE(int, tcp_insecure_rst); 843 VNET_DECLARE(int, tcp_insecure_syn); 844 VNET_DECLARE(uint32_t, tcp_map_entries_limit); 845 VNET_DECLARE(uint32_t, tcp_map_split_limit); 846 VNET_DECLARE(int, tcp_minmss); 847 VNET_DECLARE(int, tcp_mssdflt); 848 #ifdef STATS 849 VNET_DECLARE(int, tcp_perconn_stats_dflt_tpl); 850 VNET_DECLARE(int, tcp_perconn_stats_enable); 851 #endif /* STATS */ 852 VNET_DECLARE(int, tcp_recvspace); 853 VNET_DECLARE(int, tcp_sack_globalholes); 854 VNET_DECLARE(int, tcp_sack_globalmaxholes); 855 VNET_DECLARE(int, tcp_sack_maxholes); 856 VNET_DECLARE(int, tcp_sc_rst_sock_fail); 857 VNET_DECLARE(int, tcp_sendspace); 858 VNET_DECLARE(struct inpcbhead, tcb); 859 VNET_DECLARE(struct inpcbinfo, tcbinfo); 860 861 #define V_tcp_do_newcwv VNET(tcp_do_newcwv) 862 #define V_drop_synfin VNET(drop_synfin) 863 #define V_path_mtu_discovery VNET(path_mtu_discovery) 864 #define V_tcb VNET(tcb) 865 #define V_tcbinfo VNET(tcbinfo) 866 #define V_tcp_abc_l_var VNET(tcp_abc_l_var) 867 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max) 868 #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc) 869 #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max) 870 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 871 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf) 872 #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf) 873 #define V_tcp_do_ecn VNET(tcp_do_ecn) 874 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 875 #define V_tcp_ts_offset_per_conn VNET(tcp_ts_offset_per_conn) 876 #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042) 877 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 878 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 879 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe) 880 #define V_tcp_do_sack VNET(tcp_do_sack) 881 #define V_tcp_do_tso VNET(tcp_do_tso) 882 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 883 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments) 884 #define V_tcp_insecure_rst VNET(tcp_insecure_rst) 885 #define V_tcp_insecure_syn VNET(tcp_insecure_syn) 886 #define V_tcp_map_entries_limit VNET(tcp_map_entries_limit) 887 #define V_tcp_map_split_limit VNET(tcp_map_split_limit) 888 #define V_tcp_minmss VNET(tcp_minmss) 889 #define V_tcp_mssdflt VNET(tcp_mssdflt) 890 #ifdef STATS 891 #define V_tcp_perconn_stats_dflt_tpl VNET(tcp_perconn_stats_dflt_tpl) 892 #define V_tcp_perconn_stats_enable VNET(tcp_perconn_stats_enable) 893 #endif /* STATS */ 894 #define V_tcp_recvspace VNET(tcp_recvspace) 895 #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes) 896 #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes) 897 #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes) 898 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 899 #define V_tcp_sendspace VNET(tcp_sendspace) 900 #define V_tcp_udp_tunneling_overhead VNET(tcp_udp_tunneling_overhead) 901 #define V_tcp_udp_tunneling_port VNET(tcp_udp_tunneling_port) 902 903 #ifdef TCP_HHOOK 904 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 905 #define V_tcp_hhh VNET(tcp_hhh) 906 #endif 907 908 int tcp_addoptions(struct tcpopt *, u_char *); 909 int tcp_ccalgounload(struct cc_algo *unload_algo); 910 struct tcpcb * 911 tcp_close(struct tcpcb *); 912 void tcp_discardcb(struct tcpcb *); 913 void tcp_twstart(struct tcpcb *); 914 void tcp_twclose(struct tcptw *, int); 915 void tcp_ctlinput(int, struct sockaddr *, void *); 916 int tcp_ctloutput(struct socket *, struct sockopt *); 917 struct tcpcb * 918 tcp_drop(struct tcpcb *, int); 919 void tcp_drain(void); 920 void tcp_init(void); 921 void tcp_fini(void *); 922 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 923 const void *); 924 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 925 const void *); 926 int tcp_reass(struct tcpcb *, struct tcphdr *, tcp_seq *, int *, struct mbuf *); 927 void tcp_reass_global_init(void); 928 void tcp_reass_flush(struct tcpcb *); 929 void tcp_dooptions(struct tcpopt *, u_char *, int, int); 930 void tcp_dropwithreset(struct mbuf *, struct tcphdr *, 931 struct tcpcb *, int, int); 932 void tcp_pulloutofband(struct socket *, 933 struct tcphdr *, struct mbuf *, int); 934 void tcp_xmit_timer(struct tcpcb *, int); 935 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *); 936 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th, 937 uint16_t nsegs, uint16_t type); 938 void cc_conn_init(struct tcpcb *tp); 939 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th); 940 void cc_ecnpkt_handler(struct tcpcb *tp, struct tcphdr *th, uint8_t iptos); 941 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 942 #ifdef TCP_HHOOK 943 void hhook_run_tcp_est_in(struct tcpcb *tp, 944 struct tcphdr *th, struct tcpopt *to); 945 #endif 946 947 int tcp_input(struct mbuf **, int *, int); 948 int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *, 949 struct tcpcb *, int); 950 void tcp_do_segment(struct mbuf *, struct tcphdr *, 951 struct socket *, struct tcpcb *, int, int, uint8_t); 952 953 int register_tcp_functions(struct tcp_function_block *blk, int wait); 954 int register_tcp_functions_as_names(struct tcp_function_block *blk, 955 int wait, const char *names[], int *num_names); 956 int register_tcp_functions_as_name(struct tcp_function_block *blk, 957 const char *name, int wait); 958 int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce, 959 bool force); 960 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs); 961 void tcp_switch_back_to_default(struct tcpcb *tp); 962 struct tcp_function_block * 963 find_and_ref_tcp_fb(struct tcp_function_block *fs); 964 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp); 965 966 extern counter_u64_t tcp_inp_lro_direct_queue; 967 extern counter_u64_t tcp_inp_lro_wokeup_queue; 968 extern counter_u64_t tcp_inp_lro_compressed; 969 extern counter_u64_t tcp_inp_lro_single_push; 970 extern counter_u64_t tcp_inp_lro_locks_taken; 971 extern counter_u64_t tcp_inp_lro_sack_wake; 972 973 #ifdef NETFLIX_EXP_DETECTION 974 /* Various SACK attack thresholds */ 975 extern int32_t tcp_force_detection; 976 extern int32_t tcp_sack_to_ack_thresh; 977 extern int32_t tcp_sack_to_move_thresh; 978 extern int32_t tcp_restoral_thresh; 979 extern int32_t tcp_sad_decay_val; 980 extern int32_t tcp_sad_pacing_interval; 981 extern int32_t tcp_sad_low_pps; 982 extern int32_t tcp_map_minimum; 983 extern int32_t tcp_attack_on_turns_on_logging; 984 #endif 985 986 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 987 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 988 u_int tcp_maxseg(const struct tcpcb *); 989 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 990 struct tcp_ifcap *); 991 void tcp_mss(struct tcpcb *, int); 992 int tcp_mssopt(struct in_conninfo *); 993 struct inpcb * 994 tcp_drop_syn_sent(struct inpcb *, int); 995 struct tcpcb * 996 tcp_newtcpcb(struct inpcb *); 997 int tcp_output(struct tcpcb *); 998 void tcp_state_change(struct tcpcb *, int); 999 void tcp_respond(struct tcpcb *, void *, 1000 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 1001 void tcp_tw_init(void); 1002 #ifdef VIMAGE 1003 void tcp_tw_destroy(void); 1004 #endif 1005 void tcp_tw_zone_change(void); 1006 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 1007 struct mbuf *, int); 1008 void tcp_setpersist(struct tcpcb *); 1009 void tcp_slowtimo(void); 1010 struct tcptemp * 1011 tcpip_maketemplate(struct inpcb *); 1012 void tcpip_fillheaders(struct inpcb *, void *, void *); 1013 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int); 1014 int tcp_timer_suspend(struct tcpcb *, uint32_t); 1015 void tcp_timers_unsuspend(struct tcpcb *, uint32_t); 1016 int tcp_timer_active(struct tcpcb *, uint32_t); 1017 void tcp_timer_stop(struct tcpcb *, uint32_t); 1018 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 1019 int inp_to_cpuid(struct inpcb *inp); 1020 /* 1021 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 1022 */ 1023 void tcp_hc_init(void); 1024 #ifdef VIMAGE 1025 void tcp_hc_destroy(void); 1026 #endif 1027 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 1028 uint32_t tcp_hc_getmtu(struct in_conninfo *); 1029 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t); 1030 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 1031 1032 extern struct pr_usrreqs tcp_usrreqs; 1033 1034 uint32_t tcp_new_ts_offset(struct in_conninfo *); 1035 tcp_seq tcp_new_isn(struct in_conninfo *); 1036 1037 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 1038 void tcp_update_dsack_list(struct tcpcb *, tcp_seq, tcp_seq); 1039 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 1040 void tcp_clean_dsack_blocks(struct tcpcb *tp); 1041 void tcp_clean_sackreport(struct tcpcb *tp); 1042 void tcp_sack_adjust(struct tcpcb *tp); 1043 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 1044 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 1045 void tcp_free_sackholes(struct tcpcb *tp); 1046 int tcp_newreno(struct tcpcb *, struct tcphdr *); 1047 int tcp_compute_pipe(struct tcpcb *); 1048 uint32_t tcp_compute_initwnd(uint32_t); 1049 void tcp_sndbuf_autoscale(struct tcpcb *, struct socket *, uint32_t); 1050 int tcp_stats_sample_rollthedice(struct tcpcb *tp, void *seed_bytes, 1051 size_t seed_len); 1052 struct mbuf * 1053 tcp_m_copym(struct mbuf *m, int32_t off0, int32_t *plen, 1054 int32_t seglimit, int32_t segsize, struct sockbuf *sb, bool hw_tls); 1055 1056 int tcp_stats_init(void); 1057 void tcp_log_end_status(struct tcpcb *tp, uint8_t status); 1058 1059 static inline void 1060 tcp_fields_to_host(struct tcphdr *th) 1061 { 1062 1063 th->th_seq = ntohl(th->th_seq); 1064 th->th_ack = ntohl(th->th_ack); 1065 th->th_win = ntohs(th->th_win); 1066 th->th_urp = ntohs(th->th_urp); 1067 } 1068 1069 static inline void 1070 tcp_fields_to_net(struct tcphdr *th) 1071 { 1072 1073 th->th_seq = htonl(th->th_seq); 1074 th->th_ack = htonl(th->th_ack); 1075 th->th_win = htons(th->th_win); 1076 th->th_urp = htons(th->th_urp); 1077 } 1078 #endif /* _KERNEL */ 1079 1080 #endif /* _NETINET_TCP_VAR_H_ */ 1081