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