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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 #if defined(_KERNEL) || defined(_WANT_TCPCB)
45 /* TCP segment queue entry */
47 LIST_ENTRY(tseg_qent) tqe_q;
48 int tqe_len; /* TCP segment data length */
49 struct tcphdr *tqe_th; /* a pointer to tcp header */
50 struct mbuf *tqe_m; /* mbuf contains packet */
52 LIST_HEAD(tsegqe_head, tseg_qent);
55 tcp_seq start; /* start seq no. of sack block */
56 tcp_seq end; /* end seq no. */
60 tcp_seq start; /* start seq no. of hole */
61 tcp_seq end; /* end seq no. */
62 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
63 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
67 struct sackhole *nexthole;
68 int sack_bytes_rexmit;
69 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
71 int ispare; /* explicit pad for 64bit alignment */
73 * Total sacked bytes reported by the
74 * receiver via sack option
76 uint32_t _pad1[1]; /* TBD */
77 uint64_t _pad[1]; /* TBD */
81 * Tcp control block, one per tcp; fields:
82 * Organized for 16 byte cacheline efficiency.
85 struct tsegqe_head t_segq; /* segment reassembly queue */
86 int t_segqlen; /* segment reassembly queue length */
87 int t_dupacks; /* consecutive dup acks recd */
89 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
91 struct inpcb *t_inpcb; /* back pointer to internet pcb */
92 int t_state; /* state of this connection */
95 struct vnet *t_vnet; /* back pointer to parent vnet */
97 tcp_seq snd_una; /* sent but unacknowledged */
98 tcp_seq snd_max; /* highest sequence number sent;
99 * used to recognize retransmits
101 tcp_seq snd_nxt; /* send next */
102 tcp_seq snd_up; /* send urgent pointer */
104 tcp_seq snd_wl1; /* window update seg seq number */
105 tcp_seq snd_wl2; /* window update seg ack number */
106 tcp_seq iss; /* initial send sequence number */
107 tcp_seq irs; /* initial receive sequence number */
109 tcp_seq rcv_nxt; /* receive next */
110 tcp_seq rcv_adv; /* advertised window */
111 uint32_t rcv_wnd; /* receive window */
112 tcp_seq rcv_up; /* receive urgent pointer */
114 uint32_t snd_wnd; /* send window */
115 uint32_t snd_cwnd; /* congestion-controlled window */
116 uint32_t snd_ssthresh; /* snd_cwnd size threshold for
117 * for slow start exponential to
120 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
122 u_int t_rcvtime; /* inactivity time */
123 u_int t_starttime; /* time connection was established */
124 u_int t_rtttime; /* RTT measurement start time */
125 tcp_seq t_rtseq; /* sequence number being timed */
127 int t_rxtcur; /* current retransmit value (ticks) */
128 u_int t_maxseg; /* maximum segment size */
129 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
130 int t_srtt; /* smoothed round-trip time */
131 int t_rttvar; /* variance in round-trip time */
133 int t_rxtshift; /* log(2) of rexmt exp. backoff */
134 u_int t_rttmin; /* minimum rtt allowed */
135 u_int t_rttbest; /* best rtt we've seen */
136 u_long t_rttupdated; /* number of times rtt sampled */
137 uint32_t max_sndwnd; /* largest window peer has offered */
139 int t_softerror; /* possible error not yet reported */
140 /* out-of-band data */
141 char t_oobflags; /* have some */
142 char t_iobc; /* input character */
143 /* RFC 1323 variables */
144 u_char snd_scale; /* window scaling for send window */
145 u_char rcv_scale; /* window scaling for recv window */
146 u_char request_r_scale; /* pending window scaling */
147 u_int32_t ts_recent; /* timestamp echo data */
148 u_int ts_recent_age; /* when last updated */
149 u_int32_t ts_offset; /* our timestamp offset */
151 tcp_seq last_ack_sent;
153 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */
154 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */
155 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
156 int t_sndzerowin; /* zero-window updates sent */
157 u_int t_badrxtwin; /* window for retransmit recovery */
158 u_char snd_limited; /* segments limited transmitted */
159 /* SACK related state */
160 int snd_numholes; /* number of holes seen by sender */
161 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
162 /* SACK scoreboard (sorted) */
163 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
164 int rcv_numsacks; /* # distinct sack blks present */
165 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
166 tcp_seq sack_newdata; /* New data xmitted in this recovery
167 episode starts at this seq number */
168 struct sackhint sackhint; /* SACK scoreboard hint */
169 int t_rttlow; /* smallest observerved RTT */
170 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
171 int rfbuf_cnt; /* recv buffer autoscaling byte count */
172 struct toedev *tod; /* toedev handling this connection */
173 int t_sndrexmitpack; /* retransmit packets sent */
174 int t_rcvoopack; /* out-of-order packets received */
175 void *t_toe; /* TOE pcb pointer */
176 int t_bytes_acked; /* # bytes acked during current RTT */
177 struct cc_algo *cc_algo; /* congestion control algorithm */
178 struct cc_var *ccv; /* congestion control specific vars */
179 struct osd *osd; /* storage for Khelp module data */
181 u_int t_keepinit; /* time to establish connection */
182 u_int t_keepidle; /* time before keepalive probes begin */
183 u_int t_keepintvl; /* interval between keepalives */
184 u_int t_keepcnt; /* number of keepalives before close */
186 u_int t_tsomax; /* TSO total burst length limit in bytes */
187 u_int t_tsomaxsegcount; /* TSO maximum segment count */
188 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
189 u_int t_flags2; /* More tcpcb flags storage */
190 struct tcp_function_block *t_fb;/* TCP function call block */
191 void *t_fb_ptr; /* Pointer to t_fb specific data */
193 uint64_t t_tfo_cookie; /* TCP Fast Open cookie */
194 unsigned int *t_tfo_pending; /* TCP Fast Open pending counter */
197 struct mbufq t_inpkts; /* List of saved input packets. */
198 struct mbufq t_outpkts; /* List of saved output packets. */
201 #endif /* _KERNEL || _WANT_TCPCB */
205 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
210 * TODO: We yet need to brave plowing in
211 * to tcp_input() and the pru_usrreq() block.
212 * Right now these go to the old standards which
213 * are somewhat ok, but in the long term may
214 * need to be changed. If we do tackle tcp_input()
215 * then we need to get rid of the tcp_do_segment()
218 /* Flags for tcp functions */
219 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */
222 * If defining the optional tcp_timers, in the
223 * tfb_tcp_timer_stop call you must use the
224 * callout_async_drain() function with the
225 * tcp_timer_discard callback. You should check
226 * the return of callout_async_drain() and if 0
227 * increment tt_draincnt. Since the timer sub-system
228 * does not know your callbacks you must provide a
229 * stop_all function that loops through and calls
230 * tcp_timer_stop() with each of your defined timers.
231 * Adding a tfb_tcp_handoff_ok function allows the socket
232 * option to change stacks to query you even if the
233 * connection is in a later stage. You return 0 to
234 * say you can take over and run your stack, you return
235 * non-zero (an error number) to say no you can't.
236 * If the function is undefined you can only change
237 * in the early states (before connect or listen).
238 * tfb_tcp_fb_fini is changed to add a flag to tell
239 * the old stack if the tcb is being destroyed or
240 * not. A one in the flag means the TCB is being
241 * destroyed, a zero indicates its transitioning to
242 * another stack (via socket option).
244 struct tcp_function_block {
245 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX];
246 int (*tfb_tcp_output)(struct tcpcb *);
247 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *,
248 struct socket *, struct tcpcb *,
251 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt,
252 struct inpcb *inp, struct tcpcb *tp);
253 /* Optional memory allocation/free routine */
254 void (*tfb_tcp_fb_init)(struct tcpcb *);
255 void (*tfb_tcp_fb_fini)(struct tcpcb *, int);
256 /* Optional timers, must define all if you define one */
257 int (*tfb_tcp_timer_stop_all)(struct tcpcb *);
258 void (*tfb_tcp_timer_activate)(struct tcpcb *,
260 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
261 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
262 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *);
263 int (*tfb_tcp_handoff_ok)(struct tcpcb *);
264 volatile uint32_t tfb_refcnt;
268 struct tcp_function {
269 TAILQ_ENTRY(tcp_function) tf_next;
270 char tf_name[TCP_FUNCTION_NAME_LEN_MAX];
271 struct tcp_function_block *tf_fb;
274 TAILQ_HEAD(tcp_funchead, tcp_function);
278 * Flags and utility macros for the t_flags field.
280 #define TF_ACKNOW 0x000001 /* ack peer immediately */
281 #define TF_DELACK 0x000002 /* ack, but try to delay it */
282 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
283 #define TF_NOOPT 0x000008 /* don't use tcp options */
284 #define TF_SENTFIN 0x000010 /* have sent FIN */
285 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
286 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
287 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
288 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
289 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
290 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
291 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
292 #define TF_NOPUSH 0x001000 /* don't push */
293 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */
294 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
295 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
296 #define TF_LASTIDLE 0x040000 /* connection was previously idle */
297 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
298 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
299 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
300 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
301 #define TF_FORCEDATA 0x800000 /* force out a byte */
302 #define TF_TSO 0x1000000 /* TSO enabled on this connection */
303 #define TF_TOE 0x2000000 /* this connection is offloaded */
304 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
305 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
306 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
307 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
308 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
309 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */
311 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
312 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
313 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
315 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
316 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
317 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
319 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
320 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
321 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
323 #if defined(_KERNEL) && !defined(TCP_RFC7413)
324 #define IS_FASTOPEN(t_flags) (false)
326 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN)
329 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
332 * Flags for the t_oobflags field.
334 #define TCPOOB_HAVEDATA 0x01
335 #define TCPOOB_HADDATA 0x02
338 * Flags for PLPMTU handling, t_flags2
340 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
341 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
342 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
345 * Structure to hold TCP options that are only used during segment
346 * processing (in tcp_input), but not held in the tcpcb.
347 * It's basically used to reduce the number of parameters
348 * to tcp_dooptions and tcp_addoptions.
349 * The binary order of the to_flags is relevant for packing of the
350 * options in tcp_addoptions.
353 u_int32_t to_flags; /* which options are present */
354 #define TOF_MSS 0x0001 /* maximum segment size */
355 #define TOF_SCALE 0x0002 /* window scaling */
356 #define TOF_SACKPERM 0x0004 /* SACK permitted */
357 #define TOF_TS 0x0010 /* timestamp */
358 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
359 #define TOF_SACK 0x0080 /* Peer sent SACK option */
360 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */
361 #define TOF_MAXOPT 0x0200
362 u_int32_t to_tsval; /* new timestamp */
363 u_int32_t to_tsecr; /* reflected timestamp */
364 u_char *to_sacks; /* pointer to the first SACK blocks */
365 u_char *to_signature; /* pointer to the TCP-MD5 signature */
366 u_char *to_tfo_cookie; /* pointer to the TFO cookie */
367 u_int16_t to_mss; /* maximum segment size */
368 u_int8_t to_wscale; /* window scaling */
369 u_int8_t to_nsacks; /* number of SACK blocks */
370 u_int8_t to_tfo_len; /* TFO cookie length */
371 u_int32_t to_spare; /* UTO */
375 * Flags for tcp_dooptions.
377 #define TO_SYN 0x01 /* parse SYN-only options */
379 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
380 uint32_t rmx_mtu; /* MTU for this path */
381 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */
382 uint32_t rmx_rtt; /* estimated round trip time */
383 uint32_t rmx_rttvar; /* estimated rtt variance */
384 uint32_t rmx_cwnd; /* congestion window */
385 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */
386 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */
390 * Used by tcp_maxmtu() to communicate interface specific features
391 * and limits at the time of connection setup.
396 u_int tsomaxsegcount;
400 #ifndef _NETINET_IN_PCB_H_
402 #endif /* _NETINET_IN_PCB_H_ */
405 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
410 u_short last_win; /* cached window value */
411 short tw_so_options; /* copy of so_options */
412 struct ucred *tw_cred; /* user credentials */
414 u_int32_t ts_offset; /* our timestamp offset */
417 TAILQ_ENTRY(tcptw) tw_2msl;
418 void *tw_pspare; /* TCP_SIGNATURE */
419 u_int *tw_spare; /* TCP_SIGNATURE */
422 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
423 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
424 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
427 * The smoothed round-trip time and estimated variance
428 * are stored as fixed point numbers scaled by the values below.
429 * For convenience, these scales are also used in smoothing the average
430 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
431 * With these scales, srtt has 3 bits to the right of the binary point,
432 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
433 * binary point, and is smoothed with an ALPHA of 0.75.
435 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
436 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
437 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
438 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
439 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
442 * The initial retransmission should happen at rtt + 4 * rttvar.
443 * Because of the way we do the smoothing, srtt and rttvar
444 * will each average +1/2 tick of bias. When we compute
445 * the retransmit timer, we want 1/2 tick of rounding and
446 * 1 extra tick because of +-1/2 tick uncertainty in the
447 * firing of the timer. The bias will give us exactly the
448 * 1.5 tick we need. But, because the bias is
449 * statistical, we have to test that we don't drop below
450 * the minimum feasible timer (which is 2 ticks).
451 * This version of the macro adapted from a paper by Lawrence
452 * Brakmo and Larry Peterson which outlines a problem caused
453 * by insufficient precision in the original implementation,
454 * which results in inappropriately large RTO values for very
457 #define TCP_REXMTVAL(tp) \
458 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
459 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
463 * Many of these should be kept per connection,
464 * but that's inconvenient at the moment.
467 uint64_t tcps_connattempt; /* connections initiated */
468 uint64_t tcps_accepts; /* connections accepted */
469 uint64_t tcps_connects; /* connections established */
470 uint64_t tcps_drops; /* connections dropped */
471 uint64_t tcps_conndrops; /* embryonic connections dropped */
472 uint64_t tcps_minmssdrops; /* average minmss too low drops */
473 uint64_t tcps_closed; /* conn. closed (includes drops) */
474 uint64_t tcps_segstimed; /* segs where we tried to get rtt */
475 uint64_t tcps_rttupdated; /* times we succeeded */
476 uint64_t tcps_delack; /* delayed acks sent */
477 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
478 uint64_t tcps_rexmttimeo; /* retransmit timeouts */
479 uint64_t tcps_persisttimeo; /* persist timeouts */
480 uint64_t tcps_keeptimeo; /* keepalive timeouts */
481 uint64_t tcps_keepprobe; /* keepalive probes sent */
482 uint64_t tcps_keepdrops; /* connections dropped in keepalive */
484 uint64_t tcps_sndtotal; /* total packets sent */
485 uint64_t tcps_sndpack; /* data packets sent */
486 uint64_t tcps_sndbyte; /* data bytes sent */
487 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */
488 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
489 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */
490 uint64_t tcps_sndacks; /* ack-only packets sent */
491 uint64_t tcps_sndprobe; /* window probes sent */
492 uint64_t tcps_sndurg; /* packets sent with URG only */
493 uint64_t tcps_sndwinup; /* window update-only packets sent */
494 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
496 uint64_t tcps_rcvtotal; /* total packets received */
497 uint64_t tcps_rcvpack; /* packets received in sequence */
498 uint64_t tcps_rcvbyte; /* bytes received in sequence */
499 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */
500 uint64_t tcps_rcvbadoff; /* packets received with bad offset */
501 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */
502 uint64_t tcps_rcvshort; /* packets received too short */
503 uint64_t tcps_rcvduppack; /* duplicate-only packets received */
504 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
505 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */
506 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
507 uint64_t tcps_rcvoopack; /* out-of-order packets received */
508 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */
509 uint64_t tcps_rcvpackafterwin; /* packets with data after window */
510 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
511 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */
512 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */
513 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */
514 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
515 uint64_t tcps_rcvackpack; /* rcvd ack packets */
516 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
517 uint64_t tcps_rcvwinupd; /* rcvd window update packets */
518 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */
519 uint64_t tcps_predack; /* times hdr predict ok for acks */
520 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */
521 uint64_t tcps_pcbcachemiss;
522 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */
523 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */
524 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */
525 uint64_t tcps_usedrtt; /* times RTT initialized from route */
526 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */
527 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/
528 uint64_t tcps_persistdrop; /* timeout in persist state */
529 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */
530 uint64_t tcps_mturesent; /* resends due to MTU discovery */
531 uint64_t tcps_listendrop; /* listen queue overflows */
532 uint64_t tcps_badrst; /* ignored RSTs in the window */
534 uint64_t tcps_sc_added; /* entry added to syncache */
535 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
536 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */
537 uint64_t tcps_sc_dropped; /* could not reply to packet */
538 uint64_t tcps_sc_completed; /* successful extraction of entry */
539 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
540 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
541 uint64_t tcps_sc_reset; /* RST removed entry from syncache */
542 uint64_t tcps_sc_stale; /* timed out or listen socket gone */
543 uint64_t tcps_sc_aborted; /* syncache entry aborted */
544 uint64_t tcps_sc_badack; /* removed due to bad ACK */
545 uint64_t tcps_sc_unreach; /* ICMP unreachable received */
546 uint64_t tcps_sc_zonefail; /* zalloc() failed */
547 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */
548 uint64_t tcps_sc_recvcookie; /* SYN cookie received */
550 uint64_t tcps_hc_added; /* entry added to hostcache */
551 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
553 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
555 /* SACK related stats */
556 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
557 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */
558 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
559 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */
560 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */
561 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */
563 /* ECN related stats */
564 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */
565 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */
566 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */
567 uint64_t tcps_ecn_shs; /* ECN successful handshakes */
568 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
570 /* TCP_SIGNATURE related stats */
571 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */
572 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */
573 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */
574 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
575 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
577 /* Path MTU Discovery Black Hole Detection related stats */
578 uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */
579 uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */
580 uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */
582 uint64_t _pad[12]; /* 6 UTO, 6 TBD */
585 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */
588 #define TI_UNLOCKED 1
590 #include <sys/counter.h>
592 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
594 * In-kernel consumers can use these accessor macros directly to update
597 #define TCPSTAT_ADD(name, val) \
598 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
599 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
602 * Kernel module consumers must use this accessor macro.
604 void kmod_tcpstat_inc(int statnum);
605 #define KMOD_TCPSTAT_INC(name) \
606 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t))
609 * Running TCP connection count by state.
611 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]);
612 #define V_tcps_states VNET(tcps_states)
613 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1)
614 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1)
617 * TCP specific helper hook point identifiers.
619 #define HHOOK_TCP_EST_IN 0
620 #define HHOOK_TCP_EST_OUT 1
621 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
623 struct tcp_hhook_data {
634 * TCB structure exported to user-land via sysctl(3).
636 * Fields prefixed with "xt_" are unique to the export structure, and fields
637 * with "t_" or other prefixes match corresponding fields of 'struct tcpcb'.
640 * (s) - used by userland utilities in src
641 * (p) - used by utilities in ports
642 * (3) - is known to be used by third party software not in ports
643 * (n) - no known usage
645 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
646 * included. Not all of our clients do.
648 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
650 size_t xt_len; /* length of this structure */
651 struct xinpcb xt_inp;
652 char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */
654 int32_t t_state; /* (s,p) */
655 uint32_t t_flags; /* (s,p) */
656 int32_t t_sndzerowin; /* (s) */
657 int32_t t_sndrexmitpack; /* (s) */
658 int32_t t_rcvoopack; /* (s) */
659 int32_t t_rcvtime; /* (s) */
660 int32_t tt_rexmt; /* (s) */
661 int32_t tt_persist; /* (s) */
662 int32_t tt_keep; /* (s) */
663 int32_t tt_2msl; /* (s) */
664 int32_t tt_delack; /* (s) */
668 void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *);
673 * Identifiers for TCP sysctl nodes
675 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
676 #define TCPCTL_MSSDFLT 3 /* MSS default */
677 #define TCPCTL_STATS 4 /* statistics */
678 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
679 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
680 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
681 #define TCPCTL_SENDSPACE 8 /* send buffer space */
682 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
683 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
684 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
685 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
686 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
687 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
688 #define TCPCTL_DROP 15 /* drop tcp connection */
689 #define TCPCTL_STATES 16 /* connection counts by TCP state */
693 SYSCTL_DECL(_net_inet_tcp);
694 SYSCTL_DECL(_net_inet_tcp_sack);
695 MALLOC_DECLARE(M_TCPLOG);
698 extern int tcp_log_in_vain;
701 * Global TCP tunables shared between different stacks.
702 * Please keep the list sorted.
704 VNET_DECLARE(int, drop_synfin);
705 VNET_DECLARE(int, path_mtu_discovery);
706 VNET_DECLARE(int, tcp_abc_l_var);
707 VNET_DECLARE(int, tcp_autorcvbuf_inc);
708 VNET_DECLARE(int, tcp_autorcvbuf_max);
709 VNET_DECLARE(int, tcp_autosndbuf_inc);
710 VNET_DECLARE(int, tcp_autosndbuf_max);
711 VNET_DECLARE(int, tcp_delack_enabled);
712 VNET_DECLARE(int, tcp_do_autorcvbuf);
713 VNET_DECLARE(int, tcp_do_autosndbuf);
714 VNET_DECLARE(int, tcp_do_ecn);
715 VNET_DECLARE(int, tcp_do_rfc1323);
716 VNET_DECLARE(int, tcp_do_rfc3042);
717 VNET_DECLARE(int, tcp_do_rfc3390);
718 VNET_DECLARE(int, tcp_do_rfc3465);
719 VNET_DECLARE(int, tcp_do_rfc6675_pipe);
720 VNET_DECLARE(int, tcp_do_sack);
721 VNET_DECLARE(int, tcp_do_tso);
722 VNET_DECLARE(int, tcp_ecn_maxretries);
723 VNET_DECLARE(int, tcp_initcwnd_segments);
724 VNET_DECLARE(int, tcp_insecure_rst);
725 VNET_DECLARE(int, tcp_insecure_syn);
726 VNET_DECLARE(int, tcp_minmss);
727 VNET_DECLARE(int, tcp_mssdflt);
728 VNET_DECLARE(int, tcp_recvspace);
729 VNET_DECLARE(int, tcp_sack_globalholes);
730 VNET_DECLARE(int, tcp_sack_globalmaxholes);
731 VNET_DECLARE(int, tcp_sack_maxholes);
732 VNET_DECLARE(int, tcp_sc_rst_sock_fail);
733 VNET_DECLARE(int, tcp_sendspace);
734 VNET_DECLARE(struct inpcbhead, tcb);
735 VNET_DECLARE(struct inpcbinfo, tcbinfo);
737 #define V_drop_synfin VNET(drop_synfin)
738 #define V_path_mtu_discovery VNET(path_mtu_discovery)
739 #define V_tcb VNET(tcb)
740 #define V_tcbinfo VNET(tcbinfo)
741 #define V_tcp_abc_l_var VNET(tcp_abc_l_var)
742 #define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc)
743 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max)
744 #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc)
745 #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max)
746 #define V_tcp_delack_enabled VNET(tcp_delack_enabled)
747 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf)
748 #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf)
749 #define V_tcp_do_ecn VNET(tcp_do_ecn)
750 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323)
751 #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042)
752 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
753 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
754 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe)
755 #define V_tcp_do_sack VNET(tcp_do_sack)
756 #define V_tcp_do_tso VNET(tcp_do_tso)
757 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
758 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
759 #define V_tcp_insecure_rst VNET(tcp_insecure_rst)
760 #define V_tcp_insecure_syn VNET(tcp_insecure_syn)
761 #define V_tcp_minmss VNET(tcp_minmss)
762 #define V_tcp_mssdflt VNET(tcp_mssdflt)
763 #define V_tcp_recvspace VNET(tcp_recvspace)
764 #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes)
765 #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes)
766 #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes)
767 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
768 #define V_tcp_sendspace VNET(tcp_sendspace)
771 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
772 #define V_tcp_hhh VNET(tcp_hhh)
775 int tcp_addoptions(struct tcpopt *, u_char *);
776 int tcp_ccalgounload(struct cc_algo *unload_algo);
778 tcp_close(struct tcpcb *);
779 void tcp_discardcb(struct tcpcb *);
780 void tcp_twstart(struct tcpcb *);
781 void tcp_twclose(struct tcptw *, int);
782 void tcp_ctlinput(int, struct sockaddr *, void *);
783 int tcp_ctloutput(struct socket *, struct sockopt *);
785 tcp_drop(struct tcpcb *, int);
786 void tcp_drain(void);
788 void tcp_fini(void *);
789 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
791 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
793 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
794 void tcp_reass_global_init(void);
795 void tcp_reass_flush(struct tcpcb *);
796 void tcp_dooptions(struct tcpopt *, u_char *, int, int);
797 void tcp_dropwithreset(struct mbuf *, struct tcphdr *,
798 struct tcpcb *, int, int);
799 void tcp_pulloutofband(struct socket *,
800 struct tcphdr *, struct mbuf *, int);
801 void tcp_xmit_timer(struct tcpcb *, int);
802 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
803 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th,
804 uint16_t nsegs, uint16_t type);
805 void cc_conn_init(struct tcpcb *tp);
806 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th);
807 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
809 void hhook_run_tcp_est_in(struct tcpcb *tp,
810 struct tcphdr *th, struct tcpopt *to);
813 int tcp_input(struct mbuf **, int *, int);
814 int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *,
815 struct tcpcb *, int);
816 void tcp_do_segment(struct mbuf *, struct tcphdr *,
817 struct socket *, struct tcpcb *, int, int, uint8_t,
820 int register_tcp_functions(struct tcp_function_block *blk, int wait);
821 int register_tcp_functions_as_names(struct tcp_function_block *blk,
822 int wait, const char *names[], int *num_names);
823 int register_tcp_functions_as_name(struct tcp_function_block *blk,
824 const char *name, int wait);
825 int deregister_tcp_functions(struct tcp_function_block *blk);
826 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs);
827 struct tcp_function_block *find_and_ref_tcp_fb(struct tcp_function_block *blk);
828 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp);
830 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
831 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
832 u_int tcp_maxseg(const struct tcpcb *);
833 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
835 void tcp_mss(struct tcpcb *, int);
836 int tcp_mssopt(struct in_conninfo *);
838 tcp_drop_syn_sent(struct inpcb *, int);
840 tcp_newtcpcb(struct inpcb *);
841 int tcp_output(struct tcpcb *);
842 void tcp_state_change(struct tcpcb *, int);
843 void tcp_respond(struct tcpcb *, void *,
844 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
845 void tcp_tw_init(void);
847 void tcp_tw_destroy(void);
849 void tcp_tw_zone_change(void);
850 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
852 void tcp_setpersist(struct tcpcb *);
853 void tcp_slowtimo(void);
855 tcpip_maketemplate(struct inpcb *);
856 void tcpip_fillheaders(struct inpcb *, void *, void *);
857 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
858 int tcp_timer_active(struct tcpcb *, uint32_t);
859 void tcp_timer_stop(struct tcpcb *, uint32_t);
860 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
862 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
864 void tcp_hc_init(void);
866 void tcp_hc_destroy(void);
868 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
869 uint32_t tcp_hc_getmtu(struct in_conninfo *);
870 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t);
871 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
873 extern struct pr_usrreqs tcp_usrreqs;
874 tcp_seq tcp_new_isn(struct tcpcb *);
876 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
877 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
878 void tcp_clean_sackreport(struct tcpcb *tp);
879 void tcp_sack_adjust(struct tcpcb *tp);
880 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
881 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
882 void tcp_free_sackholes(struct tcpcb *tp);
883 int tcp_newreno(struct tcpcb *, struct tcphdr *);
884 int tcp_compute_pipe(struct tcpcb *);
887 tcp_fields_to_host(struct tcphdr *th)
890 th->th_seq = ntohl(th->th_seq);
891 th->th_ack = ntohl(th->th_ack);
892 th->th_win = ntohs(th->th_win);
893 th->th_urp = ntohs(th->th_urp);
897 tcp_fields_to_net(struct tcphdr *th)
900 th->th_seq = htonl(th->th_seq);
901 th->th_ack = htonl(th->th_ack);
902 th->th_win = htons(th->th_win);
903 th->th_urp = htons(th->th_urp);
907 #endif /* _NETINET_TCP_VAR_H_ */