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31 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
35 #ifndef _NETINET_TCP_VAR_H_
36 #define _NETINET_TCP_VAR_H_
38 #include <netinet/tcp.h>
39 #include <netinet/tcp_fsm.h>
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
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).
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 */
81 #if defined(_KERNEL) || defined(_WANT_TCPCB)
82 /* TCP segment queue entry */
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 */
92 TAILQ_HEAD(tsegqe_head, tseg_qent);
95 tcp_seq start; /* start seq no. of sack block */
96 tcp_seq end; /* end seq no. */
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 */
107 struct sackhole *nexthole;
108 int32_t sack_bytes_rexmit;
109 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
111 int32_t delivered_data; /* Newly acked data from last SACK */
113 int32_t sacked_bytes; /* Total sacked bytes reported by the
114 * receiver via sack option
116 uint32_t recover_fs; /* Flight Size at the start of Loss recovery */
117 uint32_t prr_delivered; /* Total bytes delivered using PRR */
118 uint32_t _pad[1]; /* TBD */
121 #define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq)
123 STAILQ_HEAD(tcp_log_stailq, tcp_log_mem);
126 * Tcp control block, one per tcp; fields:
127 * Organized for 64 byte cacheline efficiency based
128 * on common tcp_input/tcp_output processing.
132 struct inpcb *t_inpcb; /* back pointer to internet pcb */
133 struct tcp_function_block *t_fb;/* TCP function call block */
134 void *t_fb_ptr; /* Pointer to t_fb specific data */
135 uint32_t t_maxseg:24, /* maximum segment size */
136 t_logstate:8; /* State of "black box" logging */
137 uint32_t t_port:16, /* Tunneling (over udp) port */
138 t_state:4, /* state of this connection */
140 t_delayed_ack: 7, /* Delayed ack variable */
141 t_fin_is_rst: 1, /* Are fin's treated as resets */
145 tcp_seq snd_una; /* sent but unacknowledged */
146 tcp_seq snd_max; /* highest sequence number sent;
147 * used to recognize retransmits
149 tcp_seq snd_nxt; /* send next */
150 tcp_seq snd_up; /* send urgent pointer */
151 uint32_t snd_wnd; /* send window */
152 uint32_t snd_cwnd; /* congestion-controlled window */
153 uint32_t t_peakrate_thr; /* pre-calculated peak rate threshold */
155 u_int32_t ts_offset; /* our timestamp offset */
156 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
157 int rcv_numsacks; /* # distinct sack blks present */
158 u_int t_tsomax; /* TSO total burst length limit in bytes */
159 u_int t_tsomaxsegcount; /* TSO maximum segment count */
160 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
161 tcp_seq rcv_nxt; /* receive next */
162 tcp_seq rcv_adv; /* advertised window */
163 uint32_t rcv_wnd; /* receive window */
164 u_int t_flags2; /* More tcpcb flags storage */
165 int t_srtt; /* smoothed round-trip time */
166 int t_rttvar; /* variance in round-trip time */
167 u_int32_t ts_recent; /* timestamp echo data */
168 u_char snd_scale; /* window scaling for send window */
169 u_char rcv_scale; /* window scaling for recv window */
170 u_char snd_limited; /* segments limited transmitted */
171 u_char request_r_scale; /* pending window scaling */
172 tcp_seq last_ack_sent;
173 u_int t_rcvtime; /* inactivity time */
175 tcp_seq rcv_up; /* receive urgent pointer */
176 int t_segqlen; /* segment reassembly queue length */
177 uint32_t t_segqmbuflen; /* Count of bytes mbufs on all entries */
178 struct tsegqe_head t_segq; /* segment reassembly queue */
179 struct mbuf *t_in_pkt;
180 struct mbuf *t_tail_pkt;
181 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
182 struct vnet *t_vnet; /* back pointer to parent vnet */
183 uint32_t snd_ssthresh; /* snd_cwnd size threshold for
184 * for slow start exponential to
187 tcp_seq snd_wl1; /* window update seg seq number */
189 tcp_seq snd_wl2; /* window update seg ack number */
191 tcp_seq irs; /* initial receive sequence number */
192 tcp_seq iss; /* initial send sequence number */
193 u_int t_acktime; /* RACK and BBR incoming new data was acked */
194 u_int t_sndtime; /* time last data was sent */
195 u_int ts_recent_age; /* when last updated */
196 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
197 uint16_t cl4_spare; /* Spare to adjust CL 4 */
198 char t_oobflags; /* have some */
199 char t_iobc; /* input character */
200 int t_rxtcur; /* current retransmit value (ticks) */
202 int t_rxtshift; /* log(2) of rexmt exp. backoff */
203 u_int t_rtttime; /* RTT measurement start time */
205 tcp_seq t_rtseq; /* sequence number being timed */
206 u_int t_starttime; /* time connection was established */
207 u_int t_fbyte_in; /* ticks time when first byte queued in */
208 u_int t_fbyte_out; /* ticks time when first byte queued out */
210 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
211 int t_blackhole_enter; /* when to enter blackhole detection */
212 int t_blackhole_exit; /* when to exit blackhole detection */
213 u_int t_rttmin; /* minimum rtt allowed */
215 u_int t_rttbest; /* best rtt we've seen */
217 int t_softerror; /* possible error not yet reported */
218 uint32_t max_sndwnd; /* largest window peer has offered */
220 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */
221 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */
222 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
223 int t_sndzerowin; /* zero-window updates sent */
224 u_long t_rttupdated; /* number of times rtt sampled */
225 int snd_numholes; /* number of holes seen by sender */
226 u_int t_badrxtwin; /* window for retransmit recovery */
227 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
228 /* SACK scoreboard (sorted) */
229 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
230 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
231 struct sackhint sackhint; /* SACK scoreboard hint */
232 int t_rttlow; /* smallest observerved RTT */
233 int rfbuf_cnt; /* recv buffer autoscaling byte count */
234 struct toedev *tod; /* toedev handling this connection */
235 int t_sndrexmitpack; /* retransmit packets sent */
236 int t_rcvoopack; /* out-of-order packets received */
237 void *t_toe; /* TOE pcb pointer */
238 struct cc_algo *cc_algo; /* congestion control algorithm */
239 struct cc_var *ccv; /* congestion control specific vars */
240 struct osd *osd; /* storage for Khelp module data */
241 int t_bytes_acked; /* # bytes acked during current RTT */
242 u_int t_maxunacktime;
243 u_int t_keepinit; /* time to establish connection */
244 u_int t_keepidle; /* time before keepalive probes begin */
245 u_int t_keepintvl; /* interval between keepalives */
246 u_int t_keepcnt; /* number of keepalives before close */
247 int t_dupacks; /* consecutive dup acks recd */
248 int t_lognum; /* Number of log entries */
249 int t_loglimit; /* Maximum number of log entries */
250 int64_t t_pacing_rate; /* bytes / sec, -1 => unlimited */
251 struct tcp_log_stailq t_logs; /* Log buffer */
252 struct tcp_log_id_node *t_lin;
253 struct tcp_log_id_bucket *t_lib;
254 const char *t_output_caller; /* Function that called tcp_output */
255 struct statsblob *t_stats; /* Per-connection stats */
256 uint32_t t_logsn; /* Log "serial number" */
257 uint32_t gput_ts; /* Time goodput measurement started */
258 tcp_seq gput_seq; /* Outbound measurement seq */
259 tcp_seq gput_ack; /* Inbound measurement ack */
260 int32_t t_stats_gput_prev; /* XXXLAS: Prev gput measurement */
261 uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */
262 uint32_t t_end_info_status; /* Status flag of end info */
263 unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */
265 uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN];
267 } t_tfo_cookie; /* TCP Fast Open cookie to send */
269 uint8_t t_end_info_bytes[TCP_END_BYTE_INFO];
273 struct mbufq t_inpkts; /* List of saved input packets. */
274 struct mbufq t_outpkts; /* List of saved output packets. */
277 #endif /* _KERNEL || _WANT_TCPCB */
281 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
285 /* Minimum map entries limit value, if set */
286 #define TCP_MIN_MAP_ENTRIES_LIMIT 128
289 * TODO: We yet need to brave plowing in
290 * to tcp_input() and the pru_usrreq() block.
291 * Right now these go to the old standards which
292 * are somewhat ok, but in the long term may
293 * need to be changed. If we do tackle tcp_input()
294 * then we need to get rid of the tcp_do_segment()
297 /* Flags for tcp functions */
298 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */
301 * If defining the optional tcp_timers, in the
302 * tfb_tcp_timer_stop call you must use the
303 * callout_async_drain() function with the
304 * tcp_timer_discard callback. You should check
305 * the return of callout_async_drain() and if 0
306 * increment tt_draincnt. Since the timer sub-system
307 * does not know your callbacks you must provide a
308 * stop_all function that loops through and calls
309 * tcp_timer_stop() with each of your defined timers.
310 * Adding a tfb_tcp_handoff_ok function allows the socket
311 * option to change stacks to query you even if the
312 * connection is in a later stage. You return 0 to
313 * say you can take over and run your stack, you return
314 * non-zero (an error number) to say no you can't.
315 * If the function is undefined you can only change
316 * in the early states (before connect or listen).
317 * tfb_tcp_fb_fini is changed to add a flag to tell
318 * the old stack if the tcb is being destroyed or
319 * not. A one in the flag means the TCB is being
320 * destroyed, a zero indicates its transitioning to
321 * another stack (via socket option).
323 struct tcp_function_block {
324 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX];
325 int (*tfb_tcp_output)(struct tcpcb *);
326 int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *);
327 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *,
328 struct socket *, struct tcpcb *,
330 int (*tfb_do_queued_segments)(struct socket *, struct tcpcb *, int);
331 int (*tfb_do_segment_nounlock)(struct mbuf *, struct tcphdr *,
332 struct socket *, struct tcpcb *,
334 int, struct timeval *);
335 void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *,
336 struct socket *, struct tcpcb *,
338 int, struct timeval *);
339 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt,
340 struct inpcb *inp, struct tcpcb *tp);
341 /* Optional memory allocation/free routine */
342 int (*tfb_tcp_fb_init)(struct tcpcb *);
343 void (*tfb_tcp_fb_fini)(struct tcpcb *, int);
344 /* Optional timers, must define all if you define one */
345 int (*tfb_tcp_timer_stop_all)(struct tcpcb *);
346 void (*tfb_tcp_timer_activate)(struct tcpcb *,
348 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
349 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
350 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *);
351 int (*tfb_tcp_handoff_ok)(struct tcpcb *);
352 void (*tfb_tcp_mtu_chg)(struct tcpcb *);
353 int (*tfb_pru_options)(struct tcpcb *, int);
354 volatile uint32_t tfb_refcnt;
359 struct tcp_function {
360 TAILQ_ENTRY(tcp_function) tf_next;
361 char tf_name[TCP_FUNCTION_NAME_LEN_MAX];
362 struct tcp_function_block *tf_fb;
365 TAILQ_HEAD(tcp_funchead, tcp_function);
369 * Flags and utility macros for the t_flags field.
371 #define TF_ACKNOW 0x00000001 /* ack peer immediately */
372 #define TF_DELACK 0x00000002 /* ack, but try to delay it */
373 #define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */
374 #define TF_NOOPT 0x00000008 /* don't use tcp options */
375 #define TF_SENTFIN 0x00000010 /* have sent FIN */
376 #define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */
377 #define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */
378 #define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */
379 #define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */
380 #define TF_SACK_PERMIT 0x00000200 /* other side said I could SACK */
381 #define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */
382 #define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */
383 #define TF_NOPUSH 0x00001000 /* don't push */
384 #define TF_PREVVALID 0x00002000 /* saved values for bad rxmit valid */
385 #define TF_WAKESOR 0x00004000 /* wake up receive socket */
386 #define TF_GPUTINPROG 0x00008000 /* Goodput measurement in progress */
387 #define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */
388 #define TF_LQ_OVERFLOW 0x00020000 /* listen queue overflow */
389 #define TF_LASTIDLE 0x00040000 /* connection was previously idle */
390 #define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */
391 #define TF_FASTRECOVERY 0x00100000 /* in NewReno Fast Recovery */
392 #define TF_WASFRECOVERY 0x00200000 /* was in NewReno Fast Recovery */
393 #define TF_SIGNATURE 0x00400000 /* require MD5 digests (RFC2385) */
394 #define TF_FORCEDATA 0x00800000 /* force out a byte */
395 #define TF_TSO 0x01000000 /* TSO enabled on this connection */
396 #define TF_TOE 0x02000000 /* this connection is offloaded */
397 #define TF_WAKESOW 0x04000000 /* wake up send socket */
398 #define TF_UNUSED1 0x08000000 /* unused */
399 #define TF_UNUSED2 0x10000000 /* unused */
400 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
401 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
402 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */
404 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
405 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
406 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
408 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
409 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
410 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
412 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
413 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
414 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
416 #if defined(_KERNEL) && !defined(TCP_RFC7413)
417 #define IS_FASTOPEN(t_flags) (false)
419 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN)
422 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
425 * Flags for the t_oobflags field.
427 #define TCPOOB_HAVEDATA 0x01
428 #define TCPOOB_HADDATA 0x02
431 * Flags for the extended TCP flags field, t_flags2
433 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
434 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
435 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
436 #define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */
437 #define TF2_DROP_AF_DATA 0x00000010 /* Drop after all data ack'd */
438 #define TF2_ECN_PERMIT 0x00000020 /* connection ECN-ready */
439 #define TF2_ECN_SND_CWR 0x00000040 /* ECN CWR in queue */
440 #define TF2_ECN_SND_ECE 0x00000080 /* ECN ECE in queue */
441 #define TF2_ACE_PERMIT 0x00000100 /* Accurate ECN mode */
442 #define TF2_FBYTES_COMPLETE 0x00000400 /* We have first bytes in and out */
444 * Structure to hold TCP options that are only used during segment
445 * processing (in tcp_input), but not held in the tcpcb.
446 * It's basically used to reduce the number of parameters
447 * to tcp_dooptions and tcp_addoptions.
448 * The binary order of the to_flags is relevant for packing of the
449 * options in tcp_addoptions.
452 u_int32_t to_flags; /* which options are present */
453 #define TOF_MSS 0x0001 /* maximum segment size */
454 #define TOF_SCALE 0x0002 /* window scaling */
455 #define TOF_SACKPERM 0x0004 /* SACK permitted */
456 #define TOF_TS 0x0010 /* timestamp */
457 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
458 #define TOF_SACK 0x0080 /* Peer sent SACK option */
459 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */
460 #define TOF_MAXOPT 0x0200
461 u_int32_t to_tsval; /* new timestamp */
462 u_int32_t to_tsecr; /* reflected timestamp */
463 u_char *to_sacks; /* pointer to the first SACK blocks */
464 u_char *to_signature; /* pointer to the TCP-MD5 signature */
465 u_int8_t *to_tfo_cookie; /* pointer to the TFO cookie */
466 u_int16_t to_mss; /* maximum segment size */
467 u_int8_t to_wscale; /* window scaling */
468 u_int8_t to_nsacks; /* number of SACK blocks */
469 u_int8_t to_tfo_len; /* TFO cookie length */
470 u_int32_t to_spare; /* UTO */
474 * Flags for tcp_dooptions.
476 #define TO_SYN 0x01 /* parse SYN-only options */
478 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
479 uint32_t rmx_mtu; /* MTU for this path */
480 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */
481 uint32_t rmx_rtt; /* estimated round trip time */
482 uint32_t rmx_rttvar; /* estimated rtt variance */
483 uint32_t rmx_cwnd; /* congestion window */
484 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */
485 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */
489 * Used by tcp_maxmtu() to communicate interface specific features
490 * and limits at the time of connection setup.
495 u_int tsomaxsegcount;
499 #ifndef _NETINET_IN_PCB_H_
501 #endif /* _NETINET_IN_PCB_H_ */
504 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
509 u_short last_win; /* cached window value */
510 short tw_so_options; /* copy of so_options */
511 struct ucred *tw_cred; /* user credentials */
513 u_int32_t ts_offset; /* our timestamp offset */
516 TAILQ_ENTRY(tcptw) tw_2msl;
517 void *tw_pspare; /* TCP_SIGNATURE */
518 u_int *tw_spare; /* TCP_SIGNATURE */
521 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
522 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
523 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
526 * The smoothed round-trip time and estimated variance
527 * are stored as fixed point numbers scaled by the values below.
528 * For convenience, these scales are also used in smoothing the average
529 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
530 * With these scales, srtt has 3 bits to the right of the binary point,
531 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
532 * binary point, and is smoothed with an ALPHA of 0.75.
534 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
535 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
536 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
537 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
538 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
541 * The initial retransmission should happen at rtt + 4 * rttvar.
542 * Because of the way we do the smoothing, srtt and rttvar
543 * will each average +1/2 tick of bias. When we compute
544 * the retransmit timer, we want 1/2 tick of rounding and
545 * 1 extra tick because of +-1/2 tick uncertainty in the
546 * firing of the timer. The bias will give us exactly the
547 * 1.5 tick we need. But, because the bias is
548 * statistical, we have to test that we don't drop below
549 * the minimum feasible timer (which is 2 ticks).
550 * This version of the macro adapted from a paper by Lawrence
551 * Brakmo and Larry Peterson which outlines a problem caused
552 * by insufficient precision in the original implementation,
553 * which results in inappropriately large RTO values for very
556 #define TCP_REXMTVAL(tp) \
557 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
558 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
562 * Many of these should be kept per connection,
563 * but that's inconvenient at the moment.
566 uint64_t tcps_connattempt; /* connections initiated */
567 uint64_t tcps_accepts; /* connections accepted */
568 uint64_t tcps_connects; /* connections established */
569 uint64_t tcps_drops; /* connections dropped */
570 uint64_t tcps_conndrops; /* embryonic connections dropped */
571 uint64_t tcps_minmssdrops; /* average minmss too low drops */
572 uint64_t tcps_closed; /* conn. closed (includes drops) */
573 uint64_t tcps_segstimed; /* segs where we tried to get rtt */
574 uint64_t tcps_rttupdated; /* times we succeeded */
575 uint64_t tcps_delack; /* delayed acks sent */
576 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
577 uint64_t tcps_rexmttimeo; /* retransmit timeouts */
578 uint64_t tcps_persisttimeo; /* persist timeouts */
579 uint64_t tcps_keeptimeo; /* keepalive timeouts */
580 uint64_t tcps_keepprobe; /* keepalive probes sent */
581 uint64_t tcps_keepdrops; /* connections dropped in keepalive */
583 uint64_t tcps_sndtotal; /* total packets sent */
584 uint64_t tcps_sndpack; /* data packets sent */
585 uint64_t tcps_sndbyte; /* data bytes sent */
586 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */
587 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
588 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */
589 uint64_t tcps_sndacks; /* ack-only packets sent */
590 uint64_t tcps_sndprobe; /* window probes sent */
591 uint64_t tcps_sndurg; /* packets sent with URG only */
592 uint64_t tcps_sndwinup; /* window update-only packets sent */
593 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
595 uint64_t tcps_rcvtotal; /* total packets received */
596 uint64_t tcps_rcvpack; /* packets received in sequence */
597 uint64_t tcps_rcvbyte; /* bytes received in sequence */
598 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */
599 uint64_t tcps_rcvbadoff; /* packets received with bad offset */
600 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */
601 uint64_t tcps_rcvshort; /* packets received too short */
602 uint64_t tcps_rcvduppack; /* duplicate-only packets received */
603 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
604 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */
605 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
606 uint64_t tcps_rcvoopack; /* out-of-order packets received */
607 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */
608 uint64_t tcps_rcvpackafterwin; /* packets with data after window */
609 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
610 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */
611 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */
612 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */
613 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
614 uint64_t tcps_rcvackpack; /* rcvd ack packets */
615 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
616 uint64_t tcps_rcvwinupd; /* rcvd window update packets */
617 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */
618 uint64_t tcps_predack; /* times hdr predict ok for acks */
619 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */
620 uint64_t tcps_pcbcachemiss;
621 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */
622 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */
623 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */
624 uint64_t tcps_usedrtt; /* times RTT initialized from route */
625 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */
626 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/
627 uint64_t tcps_persistdrop; /* timeout in persist state */
628 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */
629 uint64_t tcps_mturesent; /* resends due to MTU discovery */
630 uint64_t tcps_listendrop; /* listen queue overflows */
631 uint64_t tcps_badrst; /* ignored RSTs in the window */
633 uint64_t tcps_sc_added; /* entry added to syncache */
634 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
635 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */
636 uint64_t tcps_sc_dropped; /* could not reply to packet */
637 uint64_t tcps_sc_completed; /* successful extraction of entry */
638 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
639 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
640 uint64_t tcps_sc_reset; /* RST removed entry from syncache */
641 uint64_t tcps_sc_stale; /* timed out or listen socket gone */
642 uint64_t tcps_sc_aborted; /* syncache entry aborted */
643 uint64_t tcps_sc_badack; /* removed due to bad ACK */
644 uint64_t tcps_sc_unreach; /* ICMP unreachable received */
645 uint64_t tcps_sc_zonefail; /* zalloc() failed */
646 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */
647 uint64_t tcps_sc_recvcookie; /* SYN cookie received */
649 uint64_t tcps_hc_added; /* entry added to hostcache */
650 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
652 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
654 /* SACK related stats */
655 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
656 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */
657 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
658 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */
659 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */
660 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */
662 /* ECN related stats */
663 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */
664 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */
665 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */
666 uint64_t tcps_ecn_shs; /* ECN successful handshakes */
667 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
669 /* TCP_SIGNATURE related stats */
670 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */
671 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */
672 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */
673 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
674 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
676 /* Path MTU Discovery Black Hole Detection related stats */
677 uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */
678 uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */
679 uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */
681 uint64_t _pad[12]; /* 6 UTO, 6 TBD */
684 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */
687 #define TI_UNLOCKED 1
689 #include <sys/counter.h>
691 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
693 * In-kernel consumers can use these accessor macros directly to update
696 #define TCPSTAT_ADD(name, val) \
697 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
698 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
701 * Kernel module consumers must use this accessor macro.
703 void kmod_tcpstat_add(int statnum, int val);
704 #define KMOD_TCPSTAT_ADD(name, val) \
705 kmod_tcpstat_add(offsetof(struct tcpstat, name) / sizeof(uint64_t), val)
706 #define KMOD_TCPSTAT_INC(name) KMOD_TCPSTAT_ADD(name, 1)
709 * Running TCP connection count by state.
711 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]);
712 #define V_tcps_states VNET(tcps_states)
713 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1)
714 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1)
717 * TCP specific helper hook point identifiers.
719 #define HHOOK_TCP_EST_IN 0
720 #define HHOOK_TCP_EST_OUT 1
721 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
723 struct tcp_hhook_data {
732 void hhook_run_tcp_est_out(struct tcpcb *tp,
733 struct tcphdr *th, struct tcpopt *to,
734 uint32_t len, int tso);
739 * TCB structure exported to user-land via sysctl(3).
741 * Fields prefixed with "xt_" are unique to the export structure, and fields
742 * with "t_" or other prefixes match corresponding fields of 'struct tcpcb'.
745 * (s) - used by userland utilities in src
746 * (p) - used by utilities in ports
747 * (3) - is known to be used by third party software not in ports
748 * (n) - no known usage
750 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
751 * included. Not all of our clients do.
753 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
755 ksize_t xt_len; /* length of this structure */
756 struct xinpcb xt_inp;
757 char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */
758 char xt_logid[TCP_LOG_ID_LEN]; /* (s) */
759 char xt_cc[TCP_CA_NAME_MAX]; /* (s) */
761 int32_t t_state; /* (s,p) */
762 uint32_t t_flags; /* (s,p) */
763 int32_t t_sndzerowin; /* (s) */
764 int32_t t_sndrexmitpack; /* (s) */
765 int32_t t_rcvoopack; /* (s) */
766 int32_t t_rcvtime; /* (s) */
767 int32_t tt_rexmt; /* (s) */
768 int32_t tt_persist; /* (s) */
769 int32_t tt_keep; /* (s) */
770 int32_t tt_2msl; /* (s) */
771 int32_t tt_delack; /* (s) */
772 int32_t t_logstate; /* (3) */
773 uint32_t t_snd_cwnd; /* (s) */
774 uint32_t t_snd_ssthresh; /* (s) */
775 uint32_t t_maxseg; /* (s) */
776 uint32_t t_rcv_wnd; /* (s) */
777 uint32_t t_snd_wnd; /* (s) */
778 uint32_t xt_ecn; /* (s) */
783 void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *);
788 * TCP function information (name-to-id mapping, aliases, and refcnt)
789 * exported to user-land via sysctl(3).
791 struct tcp_function_info {
794 char tfi_name[TCP_FUNCTION_NAME_LEN_MAX];
795 char tfi_alias[TCP_FUNCTION_NAME_LEN_MAX];
799 * Identifiers for TCP sysctl nodes
801 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
802 #define TCPCTL_MSSDFLT 3 /* MSS default */
803 #define TCPCTL_STATS 4 /* statistics */
804 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
805 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
806 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
807 #define TCPCTL_SENDSPACE 8 /* send buffer space */
808 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
809 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
810 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
811 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
812 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
813 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
814 #define TCPCTL_DROP 15 /* drop tcp connection */
815 #define TCPCTL_STATES 16 /* connection counts by TCP state */
819 SYSCTL_DECL(_net_inet_tcp);
820 SYSCTL_DECL(_net_inet_tcp_sack);
821 MALLOC_DECLARE(M_TCPLOG);
824 VNET_DECLARE(int, tcp_log_in_vain);
825 #define V_tcp_log_in_vain VNET(tcp_log_in_vain)
828 * Global TCP tunables shared between different stacks.
829 * Please keep the list sorted.
831 VNET_DECLARE(int, drop_synfin);
832 VNET_DECLARE(int, path_mtu_discovery);
833 VNET_DECLARE(int, tcp_abc_l_var);
834 VNET_DECLARE(int, tcp_autorcvbuf_max);
835 VNET_DECLARE(int, tcp_autosndbuf_inc);
836 VNET_DECLARE(int, tcp_autosndbuf_max);
837 VNET_DECLARE(int, tcp_delack_enabled);
838 VNET_DECLARE(int, tcp_do_autorcvbuf);
839 VNET_DECLARE(int, tcp_do_autosndbuf);
840 VNET_DECLARE(int, tcp_do_ecn);
841 VNET_DECLARE(int, tcp_do_newcwv);
842 VNET_DECLARE(int, tcp_do_rfc1323);
843 VNET_DECLARE(int, tcp_do_rfc3042);
844 VNET_DECLARE(int, tcp_do_rfc3390);
845 VNET_DECLARE(int, tcp_do_rfc3465);
846 VNET_DECLARE(int, tcp_do_rfc6675_pipe);
847 VNET_DECLARE(int, tcp_do_sack);
848 VNET_DECLARE(int, tcp_do_tso);
849 VNET_DECLARE(int, tcp_ecn_maxretries);
850 VNET_DECLARE(int, tcp_initcwnd_segments);
851 VNET_DECLARE(int, tcp_insecure_rst);
852 VNET_DECLARE(int, tcp_insecure_syn);
853 VNET_DECLARE(uint32_t, tcp_map_entries_limit);
854 VNET_DECLARE(uint32_t, tcp_map_split_limit);
855 VNET_DECLARE(int, tcp_minmss);
856 VNET_DECLARE(int, tcp_mssdflt);
858 VNET_DECLARE(int, tcp_perconn_stats_dflt_tpl);
859 VNET_DECLARE(int, tcp_perconn_stats_enable);
861 VNET_DECLARE(int, tcp_recvspace);
862 VNET_DECLARE(int, tcp_sack_globalholes);
863 VNET_DECLARE(int, tcp_sack_globalmaxholes);
864 VNET_DECLARE(int, tcp_sack_maxholes);
865 VNET_DECLARE(int, tcp_sc_rst_sock_fail);
866 VNET_DECLARE(int, tcp_sendspace);
867 VNET_DECLARE(struct inpcbhead, tcb);
868 VNET_DECLARE(struct inpcbinfo, tcbinfo);
870 #define V_tcp_do_prr VNET(tcp_do_prr)
871 #define V_tcp_do_prr_conservative VNET(tcp_do_prr_conservative)
872 #define V_tcp_do_newcwv VNET(tcp_do_newcwv)
873 #define V_drop_synfin VNET(drop_synfin)
874 #define V_path_mtu_discovery VNET(path_mtu_discovery)
875 #define V_tcb VNET(tcb)
876 #define V_tcbinfo VNET(tcbinfo)
877 #define V_tcp_abc_l_var VNET(tcp_abc_l_var)
878 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max)
879 #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc)
880 #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max)
881 #define V_tcp_delack_enabled VNET(tcp_delack_enabled)
882 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf)
883 #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf)
884 #define V_tcp_do_ecn VNET(tcp_do_ecn)
885 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323)
886 #define V_tcp_ts_offset_per_conn VNET(tcp_ts_offset_per_conn)
887 #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042)
888 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
889 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
890 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe)
891 #define V_tcp_do_sack VNET(tcp_do_sack)
892 #define V_tcp_do_tso VNET(tcp_do_tso)
893 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
894 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
895 #define V_tcp_insecure_rst VNET(tcp_insecure_rst)
896 #define V_tcp_insecure_syn VNET(tcp_insecure_syn)
897 #define V_tcp_map_entries_limit VNET(tcp_map_entries_limit)
898 #define V_tcp_map_split_limit VNET(tcp_map_split_limit)
899 #define V_tcp_minmss VNET(tcp_minmss)
900 #define V_tcp_mssdflt VNET(tcp_mssdflt)
902 #define V_tcp_perconn_stats_dflt_tpl VNET(tcp_perconn_stats_dflt_tpl)
903 #define V_tcp_perconn_stats_enable VNET(tcp_perconn_stats_enable)
905 #define V_tcp_recvspace VNET(tcp_recvspace)
906 #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes)
907 #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes)
908 #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes)
909 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
910 #define V_tcp_sendspace VNET(tcp_sendspace)
911 #define V_tcp_udp_tunneling_overhead VNET(tcp_udp_tunneling_overhead)
912 #define V_tcp_udp_tunneling_port VNET(tcp_udp_tunneling_port)
915 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
916 #define V_tcp_hhh VNET(tcp_hhh)
919 int tcp_addoptions(struct tcpopt *, u_char *);
920 int tcp_ccalgounload(struct cc_algo *unload_algo);
922 tcp_close(struct tcpcb *);
923 void tcp_discardcb(struct tcpcb *);
924 void tcp_twstart(struct tcpcb *);
925 void tcp_twclose(struct tcptw *, int);
926 void tcp_ctlinput(int, struct sockaddr *, void *);
927 int tcp_ctloutput(struct socket *, struct sockopt *);
929 tcp_drop(struct tcpcb *, int);
930 void tcp_drain(void);
932 void tcp_fini(void *);
933 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
935 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
937 int tcp_reass(struct tcpcb *, struct tcphdr *, tcp_seq *, int *,
939 void tcp_reass_global_init(void);
940 void tcp_reass_flush(struct tcpcb *);
941 void tcp_dooptions(struct tcpopt *, u_char *, int, int);
942 void tcp_dropwithreset(struct mbuf *, struct tcphdr *,
943 struct tcpcb *, int, int);
944 void tcp_pulloutofband(struct socket *,
945 struct tcphdr *, struct mbuf *, int);
946 void tcp_xmit_timer(struct tcpcb *, int);
947 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
948 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th,
949 uint16_t nsegs, uint16_t type);
950 void cc_conn_init(struct tcpcb *tp);
951 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th);
952 void cc_ecnpkt_handler(struct tcpcb *tp, struct tcphdr *th, uint8_t iptos);
953 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
955 void hhook_run_tcp_est_in(struct tcpcb *tp,
956 struct tcphdr *th, struct tcpopt *to);
959 int tcp_input(struct mbuf **, int *, int);
960 int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *,
961 struct tcpcb *, int);
962 void tcp_handle_wakeup(struct tcpcb *, struct socket *);
963 void tcp_do_segment(struct mbuf *, struct tcphdr *,
964 struct socket *, struct tcpcb *, int, int, uint8_t);
966 int register_tcp_functions(struct tcp_function_block *blk, int wait);
967 int register_tcp_functions_as_names(struct tcp_function_block *blk,
968 int wait, const char *names[], int *num_names);
969 int register_tcp_functions_as_name(struct tcp_function_block *blk,
970 const char *name, int wait);
971 int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce,
973 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs);
974 void tcp_switch_back_to_default(struct tcpcb *tp);
975 struct tcp_function_block *
976 find_and_ref_tcp_fb(struct tcp_function_block *fs);
977 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp);
979 extern counter_u64_t tcp_inp_lro_direct_queue;
980 extern counter_u64_t tcp_inp_lro_wokeup_queue;
981 extern counter_u64_t tcp_inp_lro_compressed;
982 extern counter_u64_t tcp_inp_lro_single_push;
983 extern counter_u64_t tcp_inp_lro_locks_taken;
984 extern counter_u64_t tcp_inp_lro_sack_wake;
986 #ifdef NETFLIX_EXP_DETECTION
987 /* Various SACK attack thresholds */
988 extern int32_t tcp_force_detection;
989 extern int32_t tcp_sack_to_ack_thresh;
990 extern int32_t tcp_sack_to_move_thresh;
991 extern int32_t tcp_restoral_thresh;
992 extern int32_t tcp_sad_decay_val;
993 extern int32_t tcp_sad_pacing_interval;
994 extern int32_t tcp_sad_low_pps;
995 extern int32_t tcp_map_minimum;
996 extern int32_t tcp_attack_on_turns_on_logging;
999 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
1000 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
1001 u_int tcp_maxseg(const struct tcpcb *);
1002 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
1003 struct tcp_ifcap *);
1004 void tcp_mss(struct tcpcb *, int);
1005 int tcp_mssopt(struct in_conninfo *);
1007 tcp_drop_syn_sent(struct inpcb *, int);
1009 tcp_newtcpcb(struct inpcb *);
1010 int tcp_output(struct tcpcb *);
1011 void tcp_state_change(struct tcpcb *, int);
1012 void tcp_respond(struct tcpcb *, void *,
1013 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
1014 void tcp_tw_init(void);
1016 void tcp_tw_destroy(void);
1018 void tcp_tw_zone_change(void);
1019 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
1020 struct mbuf *, int);
1021 void tcp_setpersist(struct tcpcb *);
1022 void tcp_slowtimo(void);
1024 tcpip_maketemplate(struct inpcb *);
1025 void tcpip_fillheaders(struct inpcb *, void *, void *);
1026 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
1027 int tcp_timer_suspend(struct tcpcb *, uint32_t);
1028 void tcp_timers_unsuspend(struct tcpcb *, uint32_t);
1029 int tcp_timer_active(struct tcpcb *, uint32_t);
1030 void tcp_timer_stop(struct tcpcb *, uint32_t);
1031 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
1032 int inp_to_cpuid(struct inpcb *inp);
1034 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
1036 void tcp_hc_init(void);
1038 void tcp_hc_destroy(void);
1040 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
1041 uint32_t tcp_hc_getmtu(struct in_conninfo *);
1042 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t);
1043 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
1045 extern struct pr_usrreqs tcp_usrreqs;
1047 uint32_t tcp_new_ts_offset(struct in_conninfo *);
1048 tcp_seq tcp_new_isn(struct in_conninfo *);
1050 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
1051 void tcp_update_dsack_list(struct tcpcb *, tcp_seq, tcp_seq);
1052 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
1053 void tcp_clean_dsack_blocks(struct tcpcb *tp);
1054 void tcp_clean_sackreport(struct tcpcb *tp);
1055 void tcp_sack_adjust(struct tcpcb *tp);
1056 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
1057 void tcp_prr_partialack(struct tcpcb *, struct tcphdr *);
1058 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
1059 void tcp_free_sackholes(struct tcpcb *tp);
1060 int tcp_newreno(struct tcpcb *, struct tcphdr *);
1061 int tcp_compute_pipe(struct tcpcb *);
1062 uint32_t tcp_compute_initwnd(uint32_t);
1063 void tcp_sndbuf_autoscale(struct tcpcb *, struct socket *, uint32_t);
1064 int tcp_stats_sample_rollthedice(struct tcpcb *tp, void *seed_bytes,
1067 tcp_m_copym(struct mbuf *m, int32_t off0, int32_t *plen,
1068 int32_t seglimit, int32_t segsize, struct sockbuf *sb, bool hw_tls);
1070 int tcp_stats_init(void);
1071 void tcp_log_end_status(struct tcpcb *tp, uint8_t status);
1074 tcp_fields_to_host(struct tcphdr *th)
1077 th->th_seq = ntohl(th->th_seq);
1078 th->th_ack = ntohl(th->th_ack);
1079 th->th_win = ntohs(th->th_win);
1080 th->th_urp = ntohs(th->th_urp);
1084 tcp_fields_to_net(struct tcphdr *th)
1087 th->th_seq = htonl(th->th_seq);
1088 th->th_ack = htonl(th->th_ack);
1089 th->th_win = htons(th->th_win);
1090 th->th_urp = htons(th->th_urp);
1092 #endif /* _KERNEL */
1094 #endif /* _NETINET_TCP_VAR_H_ */