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29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
33 #ifndef _NETINET_TCP_VAR_H_
34 #define _NETINET_TCP_VAR_H_
36 #include <netinet/tcp.h>
37 #include <netinet/tcp_fsm.h>
44 * Kernel variables for tcp.
46 VNET_DECLARE(int, tcp_do_rfc1323);
47 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323)
51 /* TCP segment queue entry */
53 LIST_ENTRY(tseg_qent) tqe_q;
54 int tqe_len; /* TCP segment data length */
55 struct tcphdr *tqe_th; /* a pointer to tcp header */
56 struct mbuf *tqe_m; /* mbuf contains packet */
58 LIST_HEAD(tsegqe_head, tseg_qent);
61 tcp_seq start; /* start seq no. of sack block */
62 tcp_seq end; /* end seq no. */
66 tcp_seq start; /* start seq no. of hole */
67 tcp_seq end; /* end seq no. */
68 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
69 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
73 struct sackhole *nexthole;
74 int sack_bytes_rexmit;
75 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
77 int ispare; /* explicit pad for 64bit alignment */
79 * Total sacked bytes reported by the
80 * receiver via sack option
82 uint32_t _pad1[1]; /* TBD */
83 uint64_t _pad[1]; /* TBD */
87 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
91 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
94 * TODO: We yet need to brave plowing in
95 * to tcp_input() and the pru_usrreq() block.
96 * Right now these go to the old standards which
97 * are somewhat ok, but in the long term may
98 * need to be changed. If we do tackle tcp_input()
99 * then we need to get rid of the tcp_do_segment()
102 /* Flags for tcp functions */
103 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */
110 * If defining the optional tcp_timers, in the
111 * tfb_tcp_timer_stop call you must use the
112 * callout_async_drain() function with the
113 * tcp_timer_discard callback. You should check
114 * the return of callout_async_drain() and if 0
115 * increment tt_draincnt. Since the timer sub-system
116 * does not know your callbacks you must provide a
117 * stop_all function that loops through and calls
118 * tcp_timer_stop() with each of your defined timers.
119 * Adding a tfb_tcp_handoff_ok function allows the socket
120 * option to change stacks to query you even if the
121 * connection is in a later stage. You return 0 to
122 * say you can take over and run your stack, you return
123 * non-zero (an error number) to say no you can't.
124 * If the function is undefined you can only change
125 * in the early states (before connect or listen).
126 * tfb_tcp_fb_fini is changed to add a flag to tell
127 * the old stack if the tcb is being destroyed or
128 * not. A one in the flag means the TCB is being
129 * destroyed, a zero indicates its transitioning to
130 * another stack (via socket option).
132 struct tcp_function_block {
133 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX];
134 int (*tfb_tcp_output)(struct tcpcb *);
135 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *,
136 struct socket *, struct tcpcb *,
139 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt,
140 struct inpcb *inp, struct tcpcb *tp);
141 /* Optional memory allocation/free routine */
142 void (*tfb_tcp_fb_init)(struct tcpcb *);
143 void (*tfb_tcp_fb_fini)(struct tcpcb *, int);
144 /* Optional timers, must define all if you define one */
145 int (*tfb_tcp_timer_stop_all)(struct tcpcb *);
146 void (*tfb_tcp_timer_activate)(struct tcpcb *,
148 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
149 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
150 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *);
151 int (*tfb_tcp_handoff_ok)(struct tcpcb *);
152 volatile uint32_t tfb_refcnt;
156 struct tcp_function {
157 TAILQ_ENTRY(tcp_function) tf_next;
158 struct tcp_function_block *tf_fb;
161 TAILQ_HEAD(tcp_funchead, tcp_function);
164 * Tcp control block, one per tcp; fields:
165 * Organized for 16 byte cacheline efficiency.
168 struct tsegqe_head t_segq; /* segment reassembly queue */
169 void *t_pspare[2]; /* new reassembly queue */
170 int t_segqlen; /* segment reassembly queue length */
171 int t_dupacks; /* consecutive dup acks recd */
173 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
175 struct inpcb *t_inpcb; /* back pointer to internet pcb */
176 int t_state; /* state of this connection */
179 struct vnet *t_vnet; /* back pointer to parent vnet */
181 tcp_seq snd_una; /* sent but unacknowledged */
182 tcp_seq snd_max; /* highest sequence number sent;
183 * used to recognize retransmits
185 tcp_seq snd_nxt; /* send next */
186 tcp_seq snd_up; /* send urgent pointer */
188 tcp_seq snd_wl1; /* window update seg seq number */
189 tcp_seq snd_wl2; /* window update seg ack number */
190 tcp_seq iss; /* initial send sequence number */
191 tcp_seq irs; /* initial receive sequence number */
193 tcp_seq rcv_nxt; /* receive next */
194 tcp_seq rcv_adv; /* advertised window */
195 uint32_t rcv_wnd; /* receive window */
196 tcp_seq rcv_up; /* receive urgent pointer */
198 uint32_t snd_wnd; /* send window */
199 uint32_t snd_cwnd; /* congestion-controlled window */
200 u_long snd_spare1; /* unused */
201 uint32_t snd_ssthresh; /* snd_cwnd size threshold for
202 * for slow start exponential to
205 u_long snd_spare2; /* unused */
206 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
208 u_int t_rcvtime; /* inactivity time */
209 u_int t_starttime; /* time connection was established */
210 u_int t_rtttime; /* RTT measurement start time */
211 tcp_seq t_rtseq; /* sequence number being timed */
213 u_int t_bw_spare1; /* unused */
214 tcp_seq t_bw_spare2; /* unused */
216 int t_rxtcur; /* current retransmit value (ticks) */
217 u_int t_maxseg; /* maximum segment size */
218 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
219 int t_srtt; /* smoothed round-trip time */
220 int t_rttvar; /* variance in round-trip time */
222 int t_rxtshift; /* log(2) of rexmt exp. backoff */
223 u_int t_rttmin; /* minimum rtt allowed */
224 u_int t_rttbest; /* best rtt we've seen */
225 u_long t_rttupdated; /* number of times rtt sampled */
226 uint32_t max_sndwnd; /* largest window peer has offered */
228 int t_softerror; /* possible error not yet reported */
229 /* out-of-band data */
230 char t_oobflags; /* have some */
231 char t_iobc; /* input character */
232 /* RFC 1323 variables */
233 u_char snd_scale; /* window scaling for send window */
234 u_char rcv_scale; /* window scaling for recv window */
235 u_char request_r_scale; /* pending window scaling */
236 u_int32_t ts_recent; /* timestamp echo data */
237 u_int ts_recent_age; /* when last updated */
238 u_int32_t ts_offset; /* our timestamp offset */
240 tcp_seq last_ack_sent;
242 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */
243 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */
244 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
245 int t_sndzerowin; /* zero-window updates sent */
246 u_int t_badrxtwin; /* window for retransmit recovery */
247 u_char snd_limited; /* segments limited transmitted */
248 /* SACK related state */
249 int snd_numholes; /* number of holes seen by sender */
250 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
251 /* SACK scoreboard (sorted) */
252 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
253 int rcv_numsacks; /* # distinct sack blks present */
254 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
255 tcp_seq sack_newdata; /* New data xmitted in this recovery
256 episode starts at this seq number */
257 struct sackhint sackhint; /* SACK scoreboard hint */
258 int t_rttlow; /* smallest observerved RTT */
259 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
260 int rfbuf_cnt; /* recv buffer autoscaling byte count */
261 struct toedev *tod; /* toedev handling this connection */
262 int t_sndrexmitpack; /* retransmit packets sent */
263 int t_rcvoopack; /* out-of-order packets received */
264 void *t_toe; /* TOE pcb pointer */
265 int t_bytes_acked; /* # bytes acked during current RTT */
266 struct cc_algo *cc_algo; /* congestion control algorithm */
267 struct cc_var *ccv; /* congestion control specific vars */
268 struct osd *osd; /* storage for Khelp module data */
270 u_int t_keepinit; /* time to establish connection */
271 u_int t_keepidle; /* time before keepalive probes begin */
272 u_int t_keepintvl; /* interval between keepalives */
273 u_int t_keepcnt; /* number of keepalives before close */
275 u_int t_tsomax; /* TSO total burst length limit in bytes */
276 u_int t_tsomaxsegcount; /* TSO maximum segment count */
277 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
278 u_int t_flags2; /* More tcpcb flags storage */
279 #if defined(_KERNEL) && defined(TCP_RFC7413)
280 uint32_t t_ispare[6]; /* 5 UTO, 1 TBD */
281 uint64_t t_tfo_cookie; /* TCP Fast Open cookie */
283 uint32_t t_ispare[8]; /* 5 UTO, 3 TBD */
285 struct tcp_function_block *t_fb;/* TCP function call block */
286 void *t_fb_ptr; /* Pointer to t_fb specific data */
287 #if defined(_KERNEL) && defined(TCP_RFC7413)
288 unsigned int *t_tfo_pending; /* TCP Fast Open pending counter */
289 void *t_pspare2[1]; /* 1 TCP_SIGNATURE */
291 void *t_pspare2[2]; /* 1 TCP_SIGNATURE, 1 TBD */
293 #if defined(_KERNEL) && defined(TCPPCAP)
294 struct mbufq t_inpkts; /* List of saved input packets. */
295 struct mbufq t_outpkts; /* List of saved output packets. */
297 uint64_t _pad[0]; /* all used! */
299 uint64_t _pad[2]; /* 2 are available */
303 #endif /* defined(_KERNEL) && defined(TCPPCAP) */
307 * Flags and utility macros for the t_flags field.
309 #define TF_ACKNOW 0x000001 /* ack peer immediately */
310 #define TF_DELACK 0x000002 /* ack, but try to delay it */
311 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
312 #define TF_NOOPT 0x000008 /* don't use tcp options */
313 #define TF_SENTFIN 0x000010 /* have sent FIN */
314 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
315 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
316 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
317 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
318 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
319 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
320 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
321 #define TF_NOPUSH 0x001000 /* don't push */
322 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */
323 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
324 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
325 #define TF_LASTIDLE 0x040000 /* connection was previously idle */
326 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
327 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
328 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
329 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
330 #define TF_FORCEDATA 0x800000 /* force out a byte */
331 #define TF_TSO 0x1000000 /* TSO enabled on this connection */
332 #define TF_TOE 0x2000000 /* this connection is offloaded */
333 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
334 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
335 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
336 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
337 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
338 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */
340 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
341 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
342 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
344 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
345 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
346 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
348 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
349 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
350 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
352 #if defined(_KERNEL) && !defined(TCP_RFC7413)
353 #define IS_FASTOPEN(t_flags) (false)
355 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN)
358 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
361 * Flags for the t_oobflags field.
363 #define TCPOOB_HAVEDATA 0x01
364 #define TCPOOB_HADDATA 0x02
367 * Flags for PLPMTU handling, t_flags2
369 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
370 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
371 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
374 * Structure to hold TCP options that are only used during segment
375 * processing (in tcp_input), but not held in the tcpcb.
376 * It's basically used to reduce the number of parameters
377 * to tcp_dooptions and tcp_addoptions.
378 * The binary order of the to_flags is relevant for packing of the
379 * options in tcp_addoptions.
382 u_int32_t to_flags; /* which options are present */
383 #define TOF_MSS 0x0001 /* maximum segment size */
384 #define TOF_SCALE 0x0002 /* window scaling */
385 #define TOF_SACKPERM 0x0004 /* SACK permitted */
386 #define TOF_TS 0x0010 /* timestamp */
387 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
388 #define TOF_SACK 0x0080 /* Peer sent SACK option */
389 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */
390 #define TOF_MAXOPT 0x0200
391 u_int32_t to_tsval; /* new timestamp */
392 u_int32_t to_tsecr; /* reflected timestamp */
393 u_char *to_sacks; /* pointer to the first SACK blocks */
394 u_char *to_signature; /* pointer to the TCP-MD5 signature */
395 u_char *to_tfo_cookie; /* pointer to the TFO cookie */
396 u_int16_t to_mss; /* maximum segment size */
397 u_int8_t to_wscale; /* window scaling */
398 u_int8_t to_nsacks; /* number of SACK blocks */
399 u_int8_t to_tfo_len; /* TFO cookie length */
400 u_int32_t to_spare; /* UTO */
404 * Flags for tcp_dooptions.
406 #define TO_SYN 0x01 /* parse SYN-only options */
408 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
409 uint32_t rmx_mtu; /* MTU for this path */
410 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */
411 uint32_t rmx_rtt; /* estimated round trip time */
412 uint32_t rmx_rttvar; /* estimated rtt variance */
413 uint32_t rmx_cwnd; /* congestion window */
414 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */
415 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */
419 * Used by tcp_maxmtu() to communicate interface specific features
420 * and limits at the time of connection setup.
425 u_int tsomaxsegcount;
429 #ifndef _NETINET_IN_PCB_H_
431 #endif /* _NETINET_IN_PCB_H_ */
434 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
439 u_short last_win; /* cached window value */
440 short tw_so_options; /* copy of so_options */
441 struct ucred *tw_cred; /* user credentials */
443 u_int32_t ts_offset; /* our timestamp offset */
446 TAILQ_ENTRY(tcptw) tw_2msl;
447 void *tw_pspare; /* TCP_SIGNATURE */
448 u_int *tw_spare; /* TCP_SIGNATURE */
451 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
452 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
453 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
456 * The smoothed round-trip time and estimated variance
457 * are stored as fixed point numbers scaled by the values below.
458 * For convenience, these scales are also used in smoothing the average
459 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
460 * With these scales, srtt has 3 bits to the right of the binary point,
461 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
462 * binary point, and is smoothed with an ALPHA of 0.75.
464 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
465 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
466 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
467 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
468 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
471 * The initial retransmission should happen at rtt + 4 * rttvar.
472 * Because of the way we do the smoothing, srtt and rttvar
473 * will each average +1/2 tick of bias. When we compute
474 * the retransmit timer, we want 1/2 tick of rounding and
475 * 1 extra tick because of +-1/2 tick uncertainty in the
476 * firing of the timer. The bias will give us exactly the
477 * 1.5 tick we need. But, because the bias is
478 * statistical, we have to test that we don't drop below
479 * the minimum feasible timer (which is 2 ticks).
480 * This version of the macro adapted from a paper by Lawrence
481 * Brakmo and Larry Peterson which outlines a problem caused
482 * by insufficient precision in the original implementation,
483 * which results in inappropriately large RTO values for very
486 #define TCP_REXMTVAL(tp) \
487 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
488 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
492 * Many of these should be kept per connection,
493 * but that's inconvenient at the moment.
496 uint64_t tcps_connattempt; /* connections initiated */
497 uint64_t tcps_accepts; /* connections accepted */
498 uint64_t tcps_connects; /* connections established */
499 uint64_t tcps_drops; /* connections dropped */
500 uint64_t tcps_conndrops; /* embryonic connections dropped */
501 uint64_t tcps_minmssdrops; /* average minmss too low drops */
502 uint64_t tcps_closed; /* conn. closed (includes drops) */
503 uint64_t tcps_segstimed; /* segs where we tried to get rtt */
504 uint64_t tcps_rttupdated; /* times we succeeded */
505 uint64_t tcps_delack; /* delayed acks sent */
506 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
507 uint64_t tcps_rexmttimeo; /* retransmit timeouts */
508 uint64_t tcps_persisttimeo; /* persist timeouts */
509 uint64_t tcps_keeptimeo; /* keepalive timeouts */
510 uint64_t tcps_keepprobe; /* keepalive probes sent */
511 uint64_t tcps_keepdrops; /* connections dropped in keepalive */
513 uint64_t tcps_sndtotal; /* total packets sent */
514 uint64_t tcps_sndpack; /* data packets sent */
515 uint64_t tcps_sndbyte; /* data bytes sent */
516 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */
517 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
518 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */
519 uint64_t tcps_sndacks; /* ack-only packets sent */
520 uint64_t tcps_sndprobe; /* window probes sent */
521 uint64_t tcps_sndurg; /* packets sent with URG only */
522 uint64_t tcps_sndwinup; /* window update-only packets sent */
523 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
525 uint64_t tcps_rcvtotal; /* total packets received */
526 uint64_t tcps_rcvpack; /* packets received in sequence */
527 uint64_t tcps_rcvbyte; /* bytes received in sequence */
528 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */
529 uint64_t tcps_rcvbadoff; /* packets received with bad offset */
530 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */
531 uint64_t tcps_rcvshort; /* packets received too short */
532 uint64_t tcps_rcvduppack; /* duplicate-only packets received */
533 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
534 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */
535 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
536 uint64_t tcps_rcvoopack; /* out-of-order packets received */
537 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */
538 uint64_t tcps_rcvpackafterwin; /* packets with data after window */
539 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
540 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */
541 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */
542 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */
543 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
544 uint64_t tcps_rcvackpack; /* rcvd ack packets */
545 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
546 uint64_t tcps_rcvwinupd; /* rcvd window update packets */
547 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */
548 uint64_t tcps_predack; /* times hdr predict ok for acks */
549 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */
550 uint64_t tcps_pcbcachemiss;
551 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */
552 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */
553 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */
554 uint64_t tcps_usedrtt; /* times RTT initialized from route */
555 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */
556 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/
557 uint64_t tcps_persistdrop; /* timeout in persist state */
558 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */
559 uint64_t tcps_mturesent; /* resends due to MTU discovery */
560 uint64_t tcps_listendrop; /* listen queue overflows */
561 uint64_t tcps_badrst; /* ignored RSTs in the window */
563 uint64_t tcps_sc_added; /* entry added to syncache */
564 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
565 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */
566 uint64_t tcps_sc_dropped; /* could not reply to packet */
567 uint64_t tcps_sc_completed; /* successful extraction of entry */
568 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
569 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
570 uint64_t tcps_sc_reset; /* RST removed entry from syncache */
571 uint64_t tcps_sc_stale; /* timed out or listen socket gone */
572 uint64_t tcps_sc_aborted; /* syncache entry aborted */
573 uint64_t tcps_sc_badack; /* removed due to bad ACK */
574 uint64_t tcps_sc_unreach; /* ICMP unreachable received */
575 uint64_t tcps_sc_zonefail; /* zalloc() failed */
576 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */
577 uint64_t tcps_sc_recvcookie; /* SYN cookie received */
579 uint64_t tcps_hc_added; /* entry added to hostcache */
580 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
582 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
584 /* SACK related stats */
585 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
586 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */
587 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
588 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */
589 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */
590 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */
592 /* ECN related stats */
593 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */
594 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */
595 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */
596 uint64_t tcps_ecn_shs; /* ECN successful handshakes */
597 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
599 /* TCP_SIGNATURE related stats */
600 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */
601 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */
602 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */
603 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
604 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
606 uint64_t _pad[12]; /* 6 UTO, 6 TBD */
609 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */
612 #define TI_UNLOCKED 1
614 #include <sys/counter.h>
616 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
618 * In-kernel consumers can use these accessor macros directly to update
621 #define TCPSTAT_ADD(name, val) \
622 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
623 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
626 * Kernel module consumers must use this accessor macro.
628 void kmod_tcpstat_inc(int statnum);
629 #define KMOD_TCPSTAT_INC(name) \
630 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t))
633 * Running TCP connection count by state.
635 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]);
636 #define V_tcps_states VNET(tcps_states)
637 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1)
638 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1)
641 * TCP specific helper hook point identifiers.
643 #define HHOOK_TCP_EST_IN 0
644 #define HHOOK_TCP_EST_OUT 1
645 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
647 struct tcp_hhook_data {
658 * TCB structure exported to user-land via sysctl(3).
659 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
660 * included. Not all of our clients do.
662 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
664 int tt_rexmt; /* retransmit timer */
665 int tt_persist; /* retransmit persistence */
666 int tt_keep; /* keepalive */
667 int tt_2msl; /* 2*msl TIME_WAIT timer */
668 int tt_delack; /* delayed ACK timer */
669 int t_rcvtime; /* Time since last packet received */
675 struct xsocket xt_socket;
676 struct xtcp_timer xt_timer;
677 u_quad_t xt_alignment_hack;
682 * Identifiers for TCP sysctl nodes
684 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
685 #define TCPCTL_MSSDFLT 3 /* MSS default */
686 #define TCPCTL_STATS 4 /* statistics */
687 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
688 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
689 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
690 #define TCPCTL_SENDSPACE 8 /* send buffer space */
691 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
692 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
693 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
694 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
695 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
696 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
697 #define TCPCTL_DROP 15 /* drop tcp connection */
698 #define TCPCTL_STATES 16 /* connection counts by TCP state */
702 SYSCTL_DECL(_net_inet_tcp);
703 SYSCTL_DECL(_net_inet_tcp_sack);
704 MALLOC_DECLARE(M_TCPLOG);
707 VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */
708 VNET_DECLARE(struct inpcbinfo, tcbinfo);
709 extern int tcp_log_in_vain;
710 VNET_DECLARE(int, tcp_mssdflt); /* XXX */
711 VNET_DECLARE(int, tcp_minmss);
712 VNET_DECLARE(int, tcp_delack_enabled);
713 VNET_DECLARE(int, tcp_do_rfc3390);
714 VNET_DECLARE(int, tcp_initcwnd_segments);
715 VNET_DECLARE(int, tcp_sendspace);
716 VNET_DECLARE(int, tcp_recvspace);
717 VNET_DECLARE(int, path_mtu_discovery);
718 VNET_DECLARE(int, tcp_do_rfc3465);
719 VNET_DECLARE(int, tcp_abc_l_var);
720 #define V_tcb VNET(tcb)
721 #define V_tcbinfo VNET(tcbinfo)
722 #define V_tcp_mssdflt VNET(tcp_mssdflt)
723 #define V_tcp_minmss VNET(tcp_minmss)
724 #define V_tcp_delack_enabled VNET(tcp_delack_enabled)
725 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
726 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
727 #define V_tcp_sendspace VNET(tcp_sendspace)
728 #define V_tcp_recvspace VNET(tcp_recvspace)
729 #define V_path_mtu_discovery VNET(path_mtu_discovery)
730 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
731 #define V_tcp_abc_l_var VNET(tcp_abc_l_var)
733 VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */
734 VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */
735 #define V_tcp_do_sack VNET(tcp_do_sack)
736 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
738 VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */
739 VNET_DECLARE(int, tcp_ecn_maxretries);
740 #define V_tcp_do_ecn VNET(tcp_do_ecn)
741 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
744 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
745 #define V_tcp_hhh VNET(tcp_hhh)
748 VNET_DECLARE(int, tcp_do_rfc6675_pipe);
749 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe)
751 int tcp_addoptions(struct tcpopt *, u_char *);
752 int tcp_ccalgounload(struct cc_algo *unload_algo);
754 tcp_close(struct tcpcb *);
755 void tcp_discardcb(struct tcpcb *);
756 void tcp_twstart(struct tcpcb *);
757 void tcp_twclose(struct tcptw *, int);
758 void tcp_ctlinput(int, struct sockaddr *, void *);
759 int tcp_ctloutput(struct socket *, struct sockopt *);
761 tcp_drop(struct tcpcb *, int);
762 void tcp_drain(void);
764 void tcp_fini(void *);
765 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
767 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
769 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
770 void tcp_reass_global_init(void);
771 void tcp_reass_flush(struct tcpcb *);
772 void tcp_dooptions(struct tcpopt *, u_char *, int, int);
773 void tcp_dropwithreset(struct mbuf *, struct tcphdr *,
774 struct tcpcb *, int, int);
775 void tcp_pulloutofband(struct socket *,
776 struct tcphdr *, struct mbuf *, int);
777 void tcp_xmit_timer(struct tcpcb *, int);
778 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
779 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th,
780 uint16_t nsegs, uint16_t type);
781 void cc_conn_init(struct tcpcb *tp);
782 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th);
783 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
785 void hhook_run_tcp_est_in(struct tcpcb *tp,
786 struct tcphdr *th, struct tcpopt *to);
789 int tcp_input(struct mbuf **, int *, int);
790 void tcp_do_segment(struct mbuf *, struct tcphdr *,
791 struct socket *, struct tcpcb *, int, int, uint8_t,
794 int register_tcp_functions(struct tcp_function_block *blk, int wait);
795 int deregister_tcp_functions(struct tcp_function_block *blk);
796 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs);
797 struct tcp_function_block *find_and_ref_tcp_fb(struct tcp_function_block *blk);
798 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp);
800 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
801 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
802 u_int tcp_maxseg(const struct tcpcb *);
803 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
805 void tcp_mss(struct tcpcb *, int);
806 int tcp_mssopt(struct in_conninfo *);
808 tcp_drop_syn_sent(struct inpcb *, int);
810 tcp_newtcpcb(struct inpcb *);
811 int tcp_output(struct tcpcb *);
812 void tcp_state_change(struct tcpcb *, int);
813 void tcp_respond(struct tcpcb *, void *,
814 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
815 void tcp_tw_init(void);
817 void tcp_tw_destroy(void);
819 void tcp_tw_zone_change(void);
820 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
822 void tcp_setpersist(struct tcpcb *);
823 void tcp_slowtimo(void);
825 tcpip_maketemplate(struct inpcb *);
826 void tcpip_fillheaders(struct inpcb *, void *, void *);
827 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
828 int tcp_timer_active(struct tcpcb *, uint32_t);
829 void tcp_timer_stop(struct tcpcb *, uint32_t);
830 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
832 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
834 void tcp_hc_init(void);
836 void tcp_hc_destroy(void);
838 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
839 uint32_t tcp_hc_getmtu(struct in_conninfo *);
840 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t);
841 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
843 extern struct pr_usrreqs tcp_usrreqs;
844 tcp_seq tcp_new_isn(struct tcpcb *);
846 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
847 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
848 void tcp_clean_sackreport(struct tcpcb *tp);
849 void tcp_sack_adjust(struct tcpcb *tp);
850 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
851 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
852 void tcp_free_sackholes(struct tcpcb *tp);
853 int tcp_newreno(struct tcpcb *, struct tcphdr *);
854 int tcp_compute_pipe(struct tcpcb *);
857 tcp_fields_to_host(struct tcphdr *th)
860 th->th_seq = ntohl(th->th_seq);
861 th->th_ack = ntohl(th->th_ack);
862 th->th_win = ntohs(th->th_win);
863 th->th_urp = ntohs(th->th_urp);
867 tcp_fields_to_net(struct tcphdr *th)
870 th->th_seq = htonl(th->th_seq);
871 th->th_ack = htonl(th->th_ack);
872 th->th_win = htons(th->th_win);
873 th->th_urp = htons(th->th_urp);
877 #endif /* _NETINET_TCP_VAR_H_ */