FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_var.h
1 /*-
2 * Copyright (c) 1982, 1986, 1993, 1994, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
30 * $FreeBSD: releng/11.0/sys/netinet/tcp_var.h 301114 2016-06-01 10:14:04Z bz $
31 */
32
33 #ifndef _NETINET_TCP_VAR_H_
34 #define _NETINET_TCP_VAR_H_
35
36 #include <netinet/tcp.h>
37 #include <netinet/tcp_fsm.h>
38
39 #ifdef _KERNEL
40 #include <net/vnet.h>
41 #include <sys/mbuf.h>
42
43 /*
44 * Kernel variables for tcp.
45 */
46 VNET_DECLARE(int, tcp_do_rfc1323);
47 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323)
48
49 #endif /* _KERNEL */
50
51 /* TCP segment queue entry */
52 struct tseg_qent {
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 */
57 };
58 LIST_HEAD(tsegqe_head, tseg_qent);
59
60 struct sackblk {
61 tcp_seq start; /* start seq no. of sack block */
62 tcp_seq end; /* end seq no. */
63 };
64
65 struct sackhole {
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 */
70 };
71
72 struct sackhint {
73 struct sackhole *nexthole;
74 int sack_bytes_rexmit;
75 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
76
77 int ispare; /* explicit pad for 64bit alignment */
78 int sacked_bytes; /*
79 * Total sacked bytes reported by the
80 * receiver via sack option
81 */
82 uint32_t _pad1[1]; /* TBD */
83 uint64_t _pad[1]; /* TBD */
84 };
85
86 struct tcptemp {
87 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
88 struct tcphdr tt_t;
89 };
90
91 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
92
93 /*
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()
100 * function below.
101 */
102 /* Flags for tcp functions */
103 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */
104 struct tcpcb;
105 struct inpcb;
106 struct sockopt;
107 struct socket;
108
109 /*
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 */
120 struct tcp_function_block {
121 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX];
122 int (*tfb_tcp_output)(struct tcpcb *);
123 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *,
124 struct socket *, struct tcpcb *,
125 int, int, uint8_t,
126 int);
127 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt,
128 struct inpcb *inp, struct tcpcb *tp);
129 /* Optional memory allocation/free routine */
130 void (*tfb_tcp_fb_init)(struct tcpcb *);
131 void (*tfb_tcp_fb_fini)(struct tcpcb *);
132 /* Optional timers, must define all if you define one */
133 int (*tfb_tcp_timer_stop_all)(struct tcpcb *);
134 void (*tfb_tcp_timer_activate)(struct tcpcb *,
135 uint32_t, u_int);
136 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
137 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
138 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *);
139 volatile uint32_t tfb_refcnt;
140 uint32_t tfb_flags;
141 };
142
143 struct tcp_function {
144 TAILQ_ENTRY(tcp_function) tf_next;
145 struct tcp_function_block *tf_fb;
146 };
147
148 TAILQ_HEAD(tcp_funchead, tcp_function);
149
150 /*
151 * Tcp control block, one per tcp; fields:
152 * Organized for 16 byte cacheline efficiency.
153 */
154 struct tcpcb {
155 struct tsegqe_head t_segq; /* segment reassembly queue */
156 void *t_pspare[2]; /* new reassembly queue */
157 int t_segqlen; /* segment reassembly queue length */
158 int t_dupacks; /* consecutive dup acks recd */
159
160 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
161
162 struct inpcb *t_inpcb; /* back pointer to internet pcb */
163 int t_state; /* state of this connection */
164 u_int t_flags;
165
166 struct vnet *t_vnet; /* back pointer to parent vnet */
167
168 tcp_seq snd_una; /* sent but unacknowledged */
169 tcp_seq snd_max; /* highest sequence number sent;
170 * used to recognize retransmits
171 */
172 tcp_seq snd_nxt; /* send next */
173 tcp_seq snd_up; /* send urgent pointer */
174
175 tcp_seq snd_wl1; /* window update seg seq number */
176 tcp_seq snd_wl2; /* window update seg ack number */
177 tcp_seq iss; /* initial send sequence number */
178 tcp_seq irs; /* initial receive sequence number */
179
180 tcp_seq rcv_nxt; /* receive next */
181 tcp_seq rcv_adv; /* advertised window */
182 u_long rcv_wnd; /* receive window */
183 tcp_seq rcv_up; /* receive urgent pointer */
184
185 u_long snd_wnd; /* send window */
186 u_long snd_cwnd; /* congestion-controlled window */
187 u_long snd_spare1; /* unused */
188 u_long snd_ssthresh; /* snd_cwnd size threshold for
189 * for slow start exponential to
190 * linear switch
191 */
192 u_long snd_spare2; /* unused */
193 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
194
195 u_int t_rcvtime; /* inactivity time */
196 u_int t_starttime; /* time connection was established */
197 u_int t_rtttime; /* RTT measurement start time */
198 tcp_seq t_rtseq; /* sequence number being timed */
199
200 u_int t_bw_spare1; /* unused */
201 tcp_seq t_bw_spare2; /* unused */
202
203 int t_rxtcur; /* current retransmit value (ticks) */
204 u_int t_maxseg; /* maximum segment size */
205 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
206 int t_srtt; /* smoothed round-trip time */
207 int t_rttvar; /* variance in round-trip time */
208
209 int t_rxtshift; /* log(2) of rexmt exp. backoff */
210 u_int t_rttmin; /* minimum rtt allowed */
211 u_int t_rttbest; /* best rtt we've seen */
212 u_long t_rttupdated; /* number of times rtt sampled */
213 u_long max_sndwnd; /* largest window peer has offered */
214
215 int t_softerror; /* possible error not yet reported */
216 /* out-of-band data */
217 char t_oobflags; /* have some */
218 char t_iobc; /* input character */
219 /* RFC 1323 variables */
220 u_char snd_scale; /* window scaling for send window */
221 u_char rcv_scale; /* window scaling for recv window */
222 u_char request_r_scale; /* pending window scaling */
223 u_int32_t ts_recent; /* timestamp echo data */
224 u_int ts_recent_age; /* when last updated */
225 u_int32_t ts_offset; /* our timestamp offset */
226
227 tcp_seq last_ack_sent;
228 /* experimental */
229 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
230 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
231 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
232 int t_sndzerowin; /* zero-window updates sent */
233 u_int t_badrxtwin; /* window for retransmit recovery */
234 u_char snd_limited; /* segments limited transmitted */
235 /* SACK related state */
236 int snd_numholes; /* number of holes seen by sender */
237 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
238 /* SACK scoreboard (sorted) */
239 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
240 int rcv_numsacks; /* # distinct sack blks present */
241 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
242 tcp_seq sack_newdata; /* New data xmitted in this recovery
243 episode starts at this seq number */
244 struct sackhint sackhint; /* SACK scoreboard hint */
245 int t_rttlow; /* smallest observerved RTT */
246 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
247 int rfbuf_cnt; /* recv buffer autoscaling byte count */
248 struct toedev *tod; /* toedev handling this connection */
249 int t_sndrexmitpack; /* retransmit packets sent */
250 int t_rcvoopack; /* out-of-order packets received */
251 void *t_toe; /* TOE pcb pointer */
252 int t_bytes_acked; /* # bytes acked during current RTT */
253 struct cc_algo *cc_algo; /* congestion control algorithm */
254 struct cc_var *ccv; /* congestion control specific vars */
255 struct osd *osd; /* storage for Khelp module data */
256
257 u_int t_keepinit; /* time to establish connection */
258 u_int t_keepidle; /* time before keepalive probes begin */
259 u_int t_keepintvl; /* interval between keepalives */
260 u_int t_keepcnt; /* number of keepalives before close */
261
262 u_int t_tsomax; /* TSO total burst length limit in bytes */
263 u_int t_tsomaxsegcount; /* TSO maximum segment count */
264 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
265 u_int t_flags2; /* More tcpcb flags storage */
266 #if defined(_KERNEL) && defined(TCP_RFC7413)
267 uint32_t t_ispare[6]; /* 5 UTO, 1 TBD */
268 uint64_t t_tfo_cookie; /* TCP Fast Open cookie */
269 #else
270 uint32_t t_ispare[8]; /* 5 UTO, 3 TBD */
271 #endif
272 struct tcp_function_block *t_fb;/* TCP function call block */
273 void *t_fb_ptr; /* Pointer to t_fb specific data */
274 #if defined(_KERNEL) && defined(TCP_RFC7413)
275 unsigned int *t_tfo_pending; /* TCP Fast Open pending counter */
276 void *t_pspare2[1]; /* 1 TCP_SIGNATURE */
277 #else
278 void *t_pspare2[2]; /* 1 TCP_SIGNATURE, 1 TBD */
279 #endif
280 #if defined(_KERNEL) && defined(TCPPCAP)
281 struct mbufq t_inpkts; /* List of saved input packets. */
282 struct mbufq t_outpkts; /* List of saved output packets. */
283 #ifdef _LP64
284 uint64_t _pad[0]; /* all used! */
285 #else
286 uint64_t _pad[2]; /* 2 are available */
287 #endif /* _LP64 */
288 #else
289 uint64_t _pad[6];
290 #endif /* defined(_KERNEL) && defined(TCPPCAP) */
291 };
292
293 /*
294 * Flags and utility macros for the t_flags field.
295 */
296 #define TF_ACKNOW 0x000001 /* ack peer immediately */
297 #define TF_DELACK 0x000002 /* ack, but try to delay it */
298 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
299 #define TF_NOOPT 0x000008 /* don't use tcp options */
300 #define TF_SENTFIN 0x000010 /* have sent FIN */
301 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
302 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
303 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
304 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
305 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
306 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
307 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
308 #define TF_NOPUSH 0x001000 /* don't push */
309 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */
310 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
311 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
312 #define TF_LASTIDLE 0x040000 /* connection was previously idle */
313 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
314 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
315 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
316 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
317 #define TF_FORCEDATA 0x800000 /* force out a byte */
318 #define TF_TSO 0x1000000 /* TSO enabled on this connection */
319 #define TF_TOE 0x2000000 /* this connection is offloaded */
320 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
321 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
322 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
323 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
324 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
325 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */
326
327 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
328 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
329 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
330
331 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
332 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
333 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
334
335 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
336 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
337 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
338
339 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
340
341 /*
342 * Flags for the t_oobflags field.
343 */
344 #define TCPOOB_HAVEDATA 0x01
345 #define TCPOOB_HADDATA 0x02
346
347 #ifdef TCP_SIGNATURE
348 /*
349 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
350 * for SADB verification and lookup.
351 */
352 #define TCP_SIGLEN 16 /* length of computed digest in bytes */
353 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
354 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
355 /*
356 * Only a single SA per host may be specified at this time. An SPI is
357 * needed in order for the KEY_ALLOCSA() lookup to work.
358 */
359 #define TCP_SIG_SPI 0x1000
360 #endif /* TCP_SIGNATURE */
361
362 /*
363 * Flags for PLPMTU handling, t_flags2
364 */
365 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
366 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
367 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
368
369 /*
370 * Structure to hold TCP options that are only used during segment
371 * processing (in tcp_input), but not held in the tcpcb.
372 * It's basically used to reduce the number of parameters
373 * to tcp_dooptions and tcp_addoptions.
374 * The binary order of the to_flags is relevant for packing of the
375 * options in tcp_addoptions.
376 */
377 struct tcpopt {
378 u_int32_t to_flags; /* which options are present */
379 #define TOF_MSS 0x0001 /* maximum segment size */
380 #define TOF_SCALE 0x0002 /* window scaling */
381 #define TOF_SACKPERM 0x0004 /* SACK permitted */
382 #define TOF_TS 0x0010 /* timestamp */
383 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
384 #define TOF_SACK 0x0080 /* Peer sent SACK option */
385 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */
386 #define TOF_MAXOPT 0x0200
387 u_int32_t to_tsval; /* new timestamp */
388 u_int32_t to_tsecr; /* reflected timestamp */
389 u_char *to_sacks; /* pointer to the first SACK blocks */
390 u_char *to_signature; /* pointer to the TCP-MD5 signature */
391 u_char *to_tfo_cookie; /* pointer to the TFO cookie */
392 u_int16_t to_mss; /* maximum segment size */
393 u_int8_t to_wscale; /* window scaling */
394 u_int8_t to_nsacks; /* number of SACK blocks */
395 u_int8_t to_tfo_len; /* TFO cookie length */
396 u_int32_t to_spare; /* UTO */
397 };
398
399 /*
400 * Flags for tcp_dooptions.
401 */
402 #define TO_SYN 0x01 /* parse SYN-only options */
403
404 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
405 u_long rmx_mtu; /* MTU for this path */
406 u_long rmx_ssthresh; /* outbound gateway buffer limit */
407 u_long rmx_rtt; /* estimated round trip time */
408 u_long rmx_rttvar; /* estimated rtt variance */
409 u_long rmx_cwnd; /* congestion window */
410 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
411 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
412 };
413
414 /*
415 * Used by tcp_maxmtu() to communicate interface specific features
416 * and limits at the time of connection setup.
417 */
418 struct tcp_ifcap {
419 int ifcap;
420 u_int tsomax;
421 u_int tsomaxsegcount;
422 u_int tsomaxsegsize;
423 };
424
425 #ifndef _NETINET_IN_PCB_H_
426 struct in_conninfo;
427 #endif /* _NETINET_IN_PCB_H_ */
428
429 struct tcptw {
430 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
431 tcp_seq snd_nxt;
432 tcp_seq rcv_nxt;
433 tcp_seq iss;
434 tcp_seq irs;
435 u_short last_win; /* cached window value */
436 u_short tw_so_options; /* copy of so_options */
437 struct ucred *tw_cred; /* user credentials */
438 u_int32_t t_recent;
439 u_int32_t ts_offset; /* our timestamp offset */
440 u_int t_starttime;
441 int tw_time;
442 TAILQ_ENTRY(tcptw) tw_2msl;
443 void *tw_pspare; /* TCP_SIGNATURE */
444 u_int *tw_spare; /* TCP_SIGNATURE */
445 };
446
447 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
448 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
449 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
450
451 /*
452 * The smoothed round-trip time and estimated variance
453 * are stored as fixed point numbers scaled by the values below.
454 * For convenience, these scales are also used in smoothing the average
455 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
456 * With these scales, srtt has 3 bits to the right of the binary point,
457 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
458 * binary point, and is smoothed with an ALPHA of 0.75.
459 */
460 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
461 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
462 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
463 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
464 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
465
466 /*
467 * The initial retransmission should happen at rtt + 4 * rttvar.
468 * Because of the way we do the smoothing, srtt and rttvar
469 * will each average +1/2 tick of bias. When we compute
470 * the retransmit timer, we want 1/2 tick of rounding and
471 * 1 extra tick because of +-1/2 tick uncertainty in the
472 * firing of the timer. The bias will give us exactly the
473 * 1.5 tick we need. But, because the bias is
474 * statistical, we have to test that we don't drop below
475 * the minimum feasible timer (which is 2 ticks).
476 * This version of the macro adapted from a paper by Lawrence
477 * Brakmo and Larry Peterson which outlines a problem caused
478 * by insufficient precision in the original implementation,
479 * which results in inappropriately large RTO values for very
480 * fast networks.
481 */
482 #define TCP_REXMTVAL(tp) \
483 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
484 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
485
486 /*
487 * TCP statistics.
488 * Many of these should be kept per connection,
489 * but that's inconvenient at the moment.
490 */
491 struct tcpstat {
492 uint64_t tcps_connattempt; /* connections initiated */
493 uint64_t tcps_accepts; /* connections accepted */
494 uint64_t tcps_connects; /* connections established */
495 uint64_t tcps_drops; /* connections dropped */
496 uint64_t tcps_conndrops; /* embryonic connections dropped */
497 uint64_t tcps_minmssdrops; /* average minmss too low drops */
498 uint64_t tcps_closed; /* conn. closed (includes drops) */
499 uint64_t tcps_segstimed; /* segs where we tried to get rtt */
500 uint64_t tcps_rttupdated; /* times we succeeded */
501 uint64_t tcps_delack; /* delayed acks sent */
502 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
503 uint64_t tcps_rexmttimeo; /* retransmit timeouts */
504 uint64_t tcps_persisttimeo; /* persist timeouts */
505 uint64_t tcps_keeptimeo; /* keepalive timeouts */
506 uint64_t tcps_keepprobe; /* keepalive probes sent */
507 uint64_t tcps_keepdrops; /* connections dropped in keepalive */
508
509 uint64_t tcps_sndtotal; /* total packets sent */
510 uint64_t tcps_sndpack; /* data packets sent */
511 uint64_t tcps_sndbyte; /* data bytes sent */
512 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */
513 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
514 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */
515 uint64_t tcps_sndacks; /* ack-only packets sent */
516 uint64_t tcps_sndprobe; /* window probes sent */
517 uint64_t tcps_sndurg; /* packets sent with URG only */
518 uint64_t tcps_sndwinup; /* window update-only packets sent */
519 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
520
521 uint64_t tcps_rcvtotal; /* total packets received */
522 uint64_t tcps_rcvpack; /* packets received in sequence */
523 uint64_t tcps_rcvbyte; /* bytes received in sequence */
524 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */
525 uint64_t tcps_rcvbadoff; /* packets received with bad offset */
526 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */
527 uint64_t tcps_rcvshort; /* packets received too short */
528 uint64_t tcps_rcvduppack; /* duplicate-only packets received */
529 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
530 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */
531 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
532 uint64_t tcps_rcvoopack; /* out-of-order packets received */
533 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */
534 uint64_t tcps_rcvpackafterwin; /* packets with data after window */
535 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
536 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */
537 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */
538 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */
539 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
540 uint64_t tcps_rcvackpack; /* rcvd ack packets */
541 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
542 uint64_t tcps_rcvwinupd; /* rcvd window update packets */
543 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */
544 uint64_t tcps_predack; /* times hdr predict ok for acks */
545 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */
546 uint64_t tcps_pcbcachemiss;
547 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */
548 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */
549 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */
550 uint64_t tcps_usedrtt; /* times RTT initialized from route */
551 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */
552 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/
553 uint64_t tcps_persistdrop; /* timeout in persist state */
554 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */
555 uint64_t tcps_mturesent; /* resends due to MTU discovery */
556 uint64_t tcps_listendrop; /* listen queue overflows */
557 uint64_t tcps_badrst; /* ignored RSTs in the window */
558
559 uint64_t tcps_sc_added; /* entry added to syncache */
560 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
561 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */
562 uint64_t tcps_sc_dropped; /* could not reply to packet */
563 uint64_t tcps_sc_completed; /* successful extraction of entry */
564 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
565 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
566 uint64_t tcps_sc_reset; /* RST removed entry from syncache */
567 uint64_t tcps_sc_stale; /* timed out or listen socket gone */
568 uint64_t tcps_sc_aborted; /* syncache entry aborted */
569 uint64_t tcps_sc_badack; /* removed due to bad ACK */
570 uint64_t tcps_sc_unreach; /* ICMP unreachable received */
571 uint64_t tcps_sc_zonefail; /* zalloc() failed */
572 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */
573 uint64_t tcps_sc_recvcookie; /* SYN cookie received */
574
575 uint64_t tcps_hc_added; /* entry added to hostcache */
576 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
577
578 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
579
580 /* SACK related stats */
581 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
582 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */
583 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
584 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */
585 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */
586 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */
587
588 /* ECN related stats */
589 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */
590 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */
591 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */
592 uint64_t tcps_ecn_shs; /* ECN successful handshakes */
593 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
594
595 /* TCP_SIGNATURE related stats */
596 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */
597 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */
598 uint64_t tcps_sig_err_buildsig; /* Mismatching signature received */
599 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
600 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
601
602 uint64_t _pad[12]; /* 6 UTO, 6 TBD */
603 };
604
605 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */
606
607 #ifdef _KERNEL
608 #define TI_UNLOCKED 1
609 #define TI_RLOCKED 2
610 #include <sys/counter.h>
611
612 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
613 /*
614 * In-kernel consumers can use these accessor macros directly to update
615 * stats.
616 */
617 #define TCPSTAT_ADD(name, val) \
618 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
619 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
620
621 /*
622 * Kernel module consumers must use this accessor macro.
623 */
624 void kmod_tcpstat_inc(int statnum);
625 #define KMOD_TCPSTAT_INC(name) \
626 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t))
627
628 /*
629 * Running TCP connection count by state.
630 */
631 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]);
632 #define V_tcps_states VNET(tcps_states)
633 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1)
634 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1)
635
636 /*
637 * TCP specific helper hook point identifiers.
638 */
639 #define HHOOK_TCP_EST_IN 0
640 #define HHOOK_TCP_EST_OUT 1
641 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
642
643 struct tcp_hhook_data {
644 struct tcpcb *tp;
645 struct tcphdr *th;
646 struct tcpopt *to;
647 long len;
648 int tso;
649 tcp_seq curack;
650 };
651 #endif
652
653 /*
654 * TCB structure exported to user-land via sysctl(3).
655 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
656 * included. Not all of our clients do.
657 */
658 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
659 struct xtcp_timer {
660 int tt_rexmt; /* retransmit timer */
661 int tt_persist; /* retransmit persistence */
662 int tt_keep; /* keepalive */
663 int tt_2msl; /* 2*msl TIME_WAIT timer */
664 int tt_delack; /* delayed ACK timer */
665 int t_rcvtime; /* Time since last packet received */
666 };
667 struct xtcpcb {
668 size_t xt_len;
669 struct inpcb xt_inp;
670 struct tcpcb xt_tp;
671 struct xsocket xt_socket;
672 struct xtcp_timer xt_timer;
673 u_quad_t xt_alignment_hack;
674 };
675 #endif
676
677 /*
678 * Identifiers for TCP sysctl nodes
679 */
680 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
681 #define TCPCTL_MSSDFLT 3 /* MSS default */
682 #define TCPCTL_STATS 4 /* statistics */
683 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
684 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
685 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
686 #define TCPCTL_SENDSPACE 8 /* send buffer space */
687 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
688 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
689 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
690 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
691 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
692 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
693 #define TCPCTL_DROP 15 /* drop tcp connection */
694 #define TCPCTL_STATES 16 /* connection counts by TCP state */
695
696 #ifdef _KERNEL
697 #ifdef SYSCTL_DECL
698 SYSCTL_DECL(_net_inet_tcp);
699 SYSCTL_DECL(_net_inet_tcp_sack);
700 MALLOC_DECLARE(M_TCPLOG);
701 #endif
702
703 VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */
704 VNET_DECLARE(struct inpcbinfo, tcbinfo);
705 extern int tcp_log_in_vain;
706 VNET_DECLARE(int, tcp_mssdflt); /* XXX */
707 VNET_DECLARE(int, tcp_minmss);
708 VNET_DECLARE(int, tcp_delack_enabled);
709 VNET_DECLARE(int, tcp_do_rfc3390);
710 VNET_DECLARE(int, tcp_initcwnd_segments);
711 VNET_DECLARE(int, tcp_sendspace);
712 VNET_DECLARE(int, tcp_recvspace);
713 VNET_DECLARE(int, path_mtu_discovery);
714 VNET_DECLARE(int, tcp_do_rfc3465);
715 VNET_DECLARE(int, tcp_abc_l_var);
716 #define V_tcb VNET(tcb)
717 #define V_tcbinfo VNET(tcbinfo)
718 #define V_tcp_mssdflt VNET(tcp_mssdflt)
719 #define V_tcp_minmss VNET(tcp_minmss)
720 #define V_tcp_delack_enabled VNET(tcp_delack_enabled)
721 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
722 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
723 #define V_tcp_sendspace VNET(tcp_sendspace)
724 #define V_tcp_recvspace VNET(tcp_recvspace)
725 #define V_path_mtu_discovery VNET(path_mtu_discovery)
726 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
727 #define V_tcp_abc_l_var VNET(tcp_abc_l_var)
728
729 VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */
730 VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */
731 #define V_tcp_do_sack VNET(tcp_do_sack)
732 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
733
734 VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */
735 VNET_DECLARE(int, tcp_ecn_maxretries);
736 #define V_tcp_do_ecn VNET(tcp_do_ecn)
737 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
738
739 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
740 #define V_tcp_hhh VNET(tcp_hhh)
741
742 VNET_DECLARE(int, tcp_do_rfc6675_pipe);
743 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe)
744
745 int tcp_addoptions(struct tcpopt *, u_char *);
746 int tcp_ccalgounload(struct cc_algo *unload_algo);
747 struct tcpcb *
748 tcp_close(struct tcpcb *);
749 void tcp_discardcb(struct tcpcb *);
750 void tcp_twstart(struct tcpcb *);
751 void tcp_twclose(struct tcptw *, int);
752 void tcp_ctlinput(int, struct sockaddr *, void *);
753 int tcp_ctloutput(struct socket *, struct sockopt *);
754 struct tcpcb *
755 tcp_drop(struct tcpcb *, int);
756 void tcp_drain(void);
757 void tcp_init(void);
758 void tcp_fini(void *);
759 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
760 const void *);
761 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
762 const void *);
763 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
764 void tcp_reass_global_init(void);
765 void tcp_reass_flush(struct tcpcb *);
766 void tcp_dooptions(struct tcpopt *, u_char *, int, int);
767 void tcp_dropwithreset(struct mbuf *, struct tcphdr *,
768 struct tcpcb *, int, int);
769 void tcp_pulloutofband(struct socket *,
770 struct tcphdr *, struct mbuf *, int);
771 void tcp_xmit_timer(struct tcpcb *, int);
772 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
773 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th,
774 uint16_t type);
775 void cc_conn_init(struct tcpcb *tp);
776 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th);
777 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
778 void hhook_run_tcp_est_in(struct tcpcb *tp,
779 struct tcphdr *th, struct tcpopt *to);
780
781 int tcp_input(struct mbuf **, int *, int);
782 void tcp_do_segment(struct mbuf *, struct tcphdr *,
783 struct socket *, struct tcpcb *, int, int, uint8_t,
784 int);
785
786 int register_tcp_functions(struct tcp_function_block *blk, int wait);
787 int deregister_tcp_functions(struct tcp_function_block *blk);
788 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs);
789 struct tcp_function_block *find_and_ref_tcp_fb(struct tcp_function_block *blk);
790 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp);
791
792 u_long tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
793 u_long tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
794 u_int tcp_maxseg(const struct tcpcb *);
795 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
796 struct tcp_ifcap *);
797 void tcp_mss(struct tcpcb *, int);
798 int tcp_mssopt(struct in_conninfo *);
799 struct inpcb *
800 tcp_drop_syn_sent(struct inpcb *, int);
801 struct tcpcb *
802 tcp_newtcpcb(struct inpcb *);
803 int tcp_output(struct tcpcb *);
804 void tcp_state_change(struct tcpcb *, int);
805 void tcp_respond(struct tcpcb *, void *,
806 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
807 void tcp_tw_init(void);
808 #ifdef VIMAGE
809 void tcp_tw_destroy(void);
810 #endif
811 void tcp_tw_zone_change(void);
812 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
813 struct mbuf *, int);
814 void tcp_setpersist(struct tcpcb *);
815 #ifdef TCP_SIGNATURE
816 struct secasvar;
817 struct secasvar *tcp_get_sav(struct mbuf *, u_int);
818 int tcp_signature_do_compute(struct mbuf *, int, int, u_char *,
819 struct secasvar *);
820 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
821 int tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *,
822 struct tcphdr *, u_int);
823 int tcp_signature_check(struct mbuf *m, int off0, int tlen, int optlen,
824 struct tcpopt *to, struct tcphdr *th, u_int tcpbflag);
825 #endif
826 void tcp_slowtimo(void);
827 struct tcptemp *
828 tcpip_maketemplate(struct inpcb *);
829 void tcpip_fillheaders(struct inpcb *, void *, void *);
830 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
831 int tcp_timer_active(struct tcpcb *, uint32_t);
832 void tcp_timer_stop(struct tcpcb *, uint32_t);
833 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
834 /*
835 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
836 */
837 void tcp_hc_init(void);
838 #ifdef VIMAGE
839 void tcp_hc_destroy(void);
840 #endif
841 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
842 u_long tcp_hc_getmtu(struct in_conninfo *);
843 void tcp_hc_updatemtu(struct in_conninfo *, u_long);
844 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
845
846 extern struct pr_usrreqs tcp_usrreqs;
847 tcp_seq tcp_new_isn(struct tcpcb *);
848
849 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
850 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
851 void tcp_clean_sackreport(struct tcpcb *tp);
852 void tcp_sack_adjust(struct tcpcb *tp);
853 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
854 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
855 void tcp_free_sackholes(struct tcpcb *tp);
856 int tcp_newreno(struct tcpcb *, struct tcphdr *);
857 u_long tcp_seq_subtract(u_long, u_long );
858 int tcp_compute_pipe(struct tcpcb *);
859
860 static inline void
861 tcp_fields_to_host(struct tcphdr *th)
862 {
863
864 th->th_seq = ntohl(th->th_seq);
865 th->th_ack = ntohl(th->th_ack);
866 th->th_win = ntohs(th->th_win);
867 th->th_urp = ntohs(th->th_urp);
868 }
869
870 #ifdef TCP_SIGNATURE
871 static inline void
872 tcp_fields_to_net(struct tcphdr *th)
873 {
874
875 th->th_seq = htonl(th->th_seq);
876 th->th_ack = htonl(th->th_ack);
877 th->th_win = htons(th->th_win);
878 th->th_urp = htons(th->th_urp);
879 }
880 #endif
881 #endif /* _KERNEL */
882
883 #endif /* _NETINET_TCP_VAR_H_ */
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