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