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 * $FreeBSD$
31 */
32
33 #ifndef _NETINET_TCP_VAR_H_
34 #define _NETINET_TCP_VAR_H_
35
36 #include <netinet/tcp.h>
37
38 #ifdef _KERNEL
39 #include <net/vnet.h>
40 #include <sys/mbuf.h>
41
42 /*
43 * Kernel variables for tcp.
44 */
45 VNET_DECLARE(int, tcp_do_rfc1323);
46 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323)
47
48 #endif /* _KERNEL */
49
50 /* TCP segment queue entry */
51 struct tseg_qent {
52 LIST_ENTRY(tseg_qent) tqe_q;
53 int tqe_len; /* TCP segment data length */
54 struct tcphdr *tqe_th; /* a pointer to tcp header */
55 struct mbuf *tqe_m; /* mbuf contains packet */
56 };
57 LIST_HEAD(tsegqe_head, tseg_qent);
58
59 struct sackblk {
60 tcp_seq start; /* start seq no. of sack block */
61 tcp_seq end; /* end seq no. */
62 };
63
64 struct sackhole {
65 tcp_seq start; /* start seq no. of hole */
66 tcp_seq end; /* end seq no. */
67 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
68 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
69 };
70
71 struct sackhint {
72 struct sackhole *nexthole;
73 int sack_bytes_rexmit;
74 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
75
76 int ispare; /* explicit pad for 64bit alignment */
77 int sacked_bytes; /*
78 * Total sacked bytes reported by the
79 * receiver via sack option
80 */
81 uint32_t _pad1[1]; /* TBD */
82 uint64_t _pad[1]; /* TBD */
83 };
84
85 struct tcptemp {
86 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
87 struct tcphdr tt_t;
88 };
89
90 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
91
92 /*
93 * TODO: We yet need to brave plowing in
94 * to tcp_input() and the pru_usrreq() block.
95 * Right now these go to the old standards which
96 * are somewhat ok, but in the long term may
97 * need to be changed. If we do tackle tcp_input()
98 * then we need to get rid of the tcp_do_segment()
99 * function below.
100 */
101 /* Flags for tcp functions */
102 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */
103 struct tcpcb;
104 struct inpcb;
105 struct sockopt;
106 struct socket;
107
108 struct tcp_function_block {
109 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX];
110 int (*tfb_tcp_output)(struct tcpcb *);
111 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *,
112 struct socket *, struct tcpcb *,
113 int, int, uint8_t,
114 int);
115 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt,
116 struct inpcb *inp, struct tcpcb *tp);
117 /* Optional memory allocation/free routine */
118 void (*tfb_tcp_fb_init)(struct tcpcb *);
119 void (*tfb_tcp_fb_fini)(struct tcpcb *);
120 /* Optional timers, must define all if you define one */
121 int (*tfb_tcp_timer_stop_all)(struct tcpcb *);
122 int (*tfb_tcp_timers_left)(struct tcpcb *);
123 void (*tfb_tcp_timer_activate)(struct tcpcb *,
124 uint32_t, u_int);
125 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
126 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
127 volatile uint32_t tfb_refcnt;
128 uint32_t tfb_flags;
129 };
130
131 struct tcp_function {
132 TAILQ_ENTRY(tcp_function) tf_next;
133 struct tcp_function_block *tf_fb;
134 };
135
136 TAILQ_HEAD(tcp_funchead, tcp_function);
137
138 /*
139 * Tcp control block, one per tcp; fields:
140 * Organized for 16 byte cacheline efficiency.
141 */
142 struct tcpcb {
143 struct tsegqe_head t_segq; /* segment reassembly queue */
144 void *t_pspare[2]; /* new reassembly queue */
145 int t_segqlen; /* segment reassembly queue length */
146 int t_dupacks; /* consecutive dup acks recd */
147
148 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
149
150 struct inpcb *t_inpcb; /* back pointer to internet pcb */
151 int t_state; /* state of this connection */
152 u_int t_flags;
153
154 struct vnet *t_vnet; /* back pointer to parent vnet */
155
156 tcp_seq snd_una; /* sent but unacknowledged */
157 tcp_seq snd_max; /* highest sequence number sent;
158 * used to recognize retransmits
159 */
160 tcp_seq snd_nxt; /* send next */
161 tcp_seq snd_up; /* send urgent pointer */
162
163 tcp_seq snd_wl1; /* window update seg seq number */
164 tcp_seq snd_wl2; /* window update seg ack number */
165 tcp_seq iss; /* initial send sequence number */
166 tcp_seq irs; /* initial receive sequence number */
167
168 tcp_seq rcv_nxt; /* receive next */
169 tcp_seq rcv_adv; /* advertised window */
170 u_long rcv_wnd; /* receive window */
171 tcp_seq rcv_up; /* receive urgent pointer */
172
173 u_long snd_wnd; /* send window */
174 u_long snd_cwnd; /* congestion-controlled window */
175 u_long snd_spare1; /* unused */
176 u_long snd_ssthresh; /* snd_cwnd size threshold for
177 * for slow start exponential to
178 * linear switch
179 */
180 u_long snd_spare2; /* unused */
181 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
182
183 u_int t_rcvtime; /* inactivity time */
184 u_int t_starttime; /* time connection was established */
185 u_int t_rtttime; /* RTT measurement start time */
186 tcp_seq t_rtseq; /* sequence number being timed */
187
188 u_int t_bw_spare1; /* unused */
189 tcp_seq t_bw_spare2; /* unused */
190
191 int t_rxtcur; /* current retransmit value (ticks) */
192 u_int t_maxseg; /* maximum segment size */
193 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
194 int t_srtt; /* smoothed round-trip time */
195 int t_rttvar; /* variance in round-trip time */
196
197 int t_rxtshift; /* log(2) of rexmt exp. backoff */
198 u_int t_rttmin; /* minimum rtt allowed */
199 u_int t_rttbest; /* best rtt we've seen */
200 u_long t_rttupdated; /* number of times rtt sampled */
201 u_long max_sndwnd; /* largest window peer has offered */
202
203 int t_softerror; /* possible error not yet reported */
204 /* out-of-band data */
205 char t_oobflags; /* have some */
206 char t_iobc; /* input character */
207 /* RFC 1323 variables */
208 u_char snd_scale; /* window scaling for send window */
209 u_char rcv_scale; /* window scaling for recv window */
210 u_char request_r_scale; /* pending window scaling */
211 u_int32_t ts_recent; /* timestamp echo data */
212 u_int ts_recent_age; /* when last updated */
213 u_int32_t ts_offset; /* our timestamp offset */
214
215 tcp_seq last_ack_sent;
216 /* experimental */
217 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
218 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
219 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
220 int t_sndzerowin; /* zero-window updates sent */
221 u_int t_badrxtwin; /* window for retransmit recovery */
222 u_char snd_limited; /* segments limited transmitted */
223 /* SACK related state */
224 int snd_numholes; /* number of holes seen by sender */
225 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
226 /* SACK scoreboard (sorted) */
227 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
228 int rcv_numsacks; /* # distinct sack blks present */
229 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
230 tcp_seq sack_newdata; /* New data xmitted in this recovery
231 episode starts at this seq number */
232 struct sackhint sackhint; /* SACK scoreboard hint */
233 int t_rttlow; /* smallest observerved RTT */
234 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
235 int rfbuf_cnt; /* recv buffer autoscaling byte count */
236 struct toedev *tod; /* toedev handling this connection */
237 int t_sndrexmitpack; /* retransmit packets sent */
238 int t_rcvoopack; /* out-of-order packets received */
239 void *t_toe; /* TOE pcb pointer */
240 int t_bytes_acked; /* # bytes acked during current RTT */
241 struct cc_algo *cc_algo; /* congestion control algorithm */
242 struct cc_var *ccv; /* congestion control specific vars */
243 struct osd *osd; /* storage for Khelp module data */
244
245 u_int t_keepinit; /* time to establish connection */
246 u_int t_keepidle; /* time before keepalive probes begin */
247 u_int t_keepintvl; /* interval between keepalives */
248 u_int t_keepcnt; /* number of keepalives before close */
249
250 u_int t_tsomax; /* TSO total burst length limit in bytes */
251 u_int t_tsomaxsegcount; /* TSO maximum segment count */
252 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
253 u_int t_flags2; /* More tcpcb flags storage */
254 #if defined(_KERNEL) && defined(TCP_RFC7413)
255 uint32_t t_ispare[6]; /* 5 UTO, 1 TBD */
256 uint64_t t_tfo_cookie; /* TCP Fast Open cookie */
257 #else
258 uint32_t t_ispare[8]; /* 5 UTO, 3 TBD */
259 #endif
260 struct tcp_function_block *t_fb;/* TCP function call block */
261 void *t_fb_ptr; /* Pointer to t_fb specific data */
262 #if defined(_KERNEL) && defined(TCP_RFC7413)
263 unsigned int *t_tfo_pending; /* TCP Fast Open pending counter */
264 void *t_pspare2[1]; /* 1 TCP_SIGNATURE */
265 #else
266 void *t_pspare2[2]; /* 1 TCP_SIGNATURE, 1 TBD */
267 #endif
268 #if defined(_KERNEL) && defined(TCPPCAP)
269 struct mbufq t_inpkts; /* List of saved input packets. */
270 struct mbufq t_outpkts; /* List of saved output packets. */
271 #ifdef _LP64
272 uint64_t _pad[0]; /* all used! */
273 #else
274 uint64_t _pad[2]; /* 2 are available */
275 #endif /* _LP64 */
276 #else
277 uint64_t _pad[6];
278 #endif /* defined(_KERNEL) && defined(TCPPCAP) */
279 };
280
281 /*
282 * Flags and utility macros for the t_flags field.
283 */
284 #define TF_ACKNOW 0x000001 /* ack peer immediately */
285 #define TF_DELACK 0x000002 /* ack, but try to delay it */
286 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
287 #define TF_NOOPT 0x000008 /* don't use tcp options */
288 #define TF_SENTFIN 0x000010 /* have sent FIN */
289 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
290 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
291 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
292 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
293 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
294 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
295 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
296 #define TF_NOPUSH 0x001000 /* don't push */
297 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */
298 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
299 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
300 #define TF_LASTIDLE 0x040000 /* connection was previously idle */
301 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
302 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
303 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
304 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
305 #define TF_FORCEDATA 0x800000 /* force out a byte */
306 #define TF_TSO 0x1000000 /* TSO enabled on this connection */
307 #define TF_TOE 0x2000000 /* this connection is offloaded */
308 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
309 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
310 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
311 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
312 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
313 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */
314
315 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
316 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
317 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
318
319 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
320 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
321 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
322
323 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
324 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
325 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
326
327 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
328
329 /*
330 * Flags for the t_oobflags field.
331 */
332 #define TCPOOB_HAVEDATA 0x01
333 #define TCPOOB_HADDATA 0x02
334
335 #ifdef TCP_SIGNATURE
336 /*
337 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
338 * for SADB verification and lookup.
339 */
340 #define TCP_SIGLEN 16 /* length of computed digest in bytes */
341 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
342 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
343 /*
344 * Only a single SA per host may be specified at this time. An SPI is
345 * needed in order for the KEY_ALLOCSA() lookup to work.
346 */
347 #define TCP_SIG_SPI 0x1000
348 #endif /* TCP_SIGNATURE */
349
350 /*
351 * Flags for PLPMTU handling, t_flags2
352 */
353 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
354 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
355 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
356
357 /*
358 * Structure to hold TCP options that are only used during segment
359 * processing (in tcp_input), but not held in the tcpcb.
360 * It's basically used to reduce the number of parameters
361 * to tcp_dooptions and tcp_addoptions.
362 * The binary order of the to_flags is relevant for packing of the
363 * options in tcp_addoptions.
364 */
365 struct tcpopt {
366 u_int64_t to_flags; /* which options are present */
367 #define TOF_MSS 0x0001 /* maximum segment size */
368 #define TOF_SCALE 0x0002 /* window scaling */
369 #define TOF_SACKPERM 0x0004 /* SACK permitted */
370 #define TOF_TS 0x0010 /* timestamp */
371 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
372 #define TOF_SACK 0x0080 /* Peer sent SACK option */
373 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */
374 #define TOF_MAXOPT 0x0200
375 u_int32_t to_tsval; /* new timestamp */
376 u_int32_t to_tsecr; /* reflected timestamp */
377 u_char *to_sacks; /* pointer to the first SACK blocks */
378 u_char *to_signature; /* pointer to the TCP-MD5 signature */
379 u_char *to_tfo_cookie; /* pointer to the TFO cookie */
380 u_int16_t to_mss; /* maximum segment size */
381 u_int8_t to_wscale; /* window scaling */
382 u_int8_t to_nsacks; /* number of SACK blocks */
383 u_int8_t to_tfo_len; /* TFO cookie length */
384 u_int32_t to_spare; /* UTO */
385 };
386
387 /*
388 * Flags for tcp_dooptions.
389 */
390 #define TO_SYN 0x01 /* parse SYN-only options */
391
392 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
393 u_long rmx_mtu; /* MTU for this path */
394 u_long rmx_ssthresh; /* outbound gateway buffer limit */
395 u_long rmx_rtt; /* estimated round trip time */
396 u_long rmx_rttvar; /* estimated rtt variance */
397 u_long rmx_cwnd; /* congestion window */
398 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
399 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
400 };
401
402 /*
403 * Used by tcp_maxmtu() to communicate interface specific features
404 * and limits at the time of connection setup.
405 */
406 struct tcp_ifcap {
407 int ifcap;
408 u_int tsomax;
409 u_int tsomaxsegcount;
410 u_int tsomaxsegsize;
411 };
412
413 #ifndef _NETINET_IN_PCB_H_
414 struct in_conninfo;
415 #endif /* _NETINET_IN_PCB_H_ */
416
417 struct tcptw {
418 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
419 tcp_seq snd_nxt;
420 tcp_seq rcv_nxt;
421 tcp_seq iss;
422 tcp_seq irs;
423 u_short last_win; /* cached window value */
424 u_short tw_so_options; /* copy of so_options */
425 struct ucred *tw_cred; /* user credentials */
426 u_int32_t t_recent;
427 u_int32_t ts_offset; /* our timestamp offset */
428 u_int t_starttime;
429 int tw_time;
430 TAILQ_ENTRY(tcptw) tw_2msl;
431 void *tw_pspare; /* TCP_SIGNATURE */
432 u_int *tw_spare; /* TCP_SIGNATURE */
433 };
434
435 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
436 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
437 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
438
439 /*
440 * The smoothed round-trip time and estimated variance
441 * are stored as fixed point numbers scaled by the values below.
442 * For convenience, these scales are also used in smoothing the average
443 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
444 * With these scales, srtt has 3 bits to the right of the binary point,
445 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
446 * binary point, and is smoothed with an ALPHA of 0.75.
447 */
448 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
449 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
450 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
451 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
452 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
453
454 /*
455 * The initial retransmission should happen at rtt + 4 * rttvar.
456 * Because of the way we do the smoothing, srtt and rttvar
457 * will each average +1/2 tick of bias. When we compute
458 * the retransmit timer, we want 1/2 tick of rounding and
459 * 1 extra tick because of +-1/2 tick uncertainty in the
460 * firing of the timer. The bias will give us exactly the
461 * 1.5 tick we need. But, because the bias is
462 * statistical, we have to test that we don't drop below
463 * the minimum feasible timer (which is 2 ticks).
464 * This version of the macro adapted from a paper by Lawrence
465 * Brakmo and Larry Peterson which outlines a problem caused
466 * by insufficient precision in the original implementation,
467 * which results in inappropriately large RTO values for very
468 * fast networks.
469 */
470 #define TCP_REXMTVAL(tp) \
471 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
472 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
473
474 /*
475 * TCP statistics.
476 * Many of these should be kept per connection,
477 * but that's inconvenient at the moment.
478 */
479 struct tcpstat {
480 uint64_t tcps_connattempt; /* connections initiated */
481 uint64_t tcps_accepts; /* connections accepted */
482 uint64_t tcps_connects; /* connections established */
483 uint64_t tcps_drops; /* connections dropped */
484 uint64_t tcps_conndrops; /* embryonic connections dropped */
485 uint64_t tcps_minmssdrops; /* average minmss too low drops */
486 uint64_t tcps_closed; /* conn. closed (includes drops) */
487 uint64_t tcps_segstimed; /* segs where we tried to get rtt */
488 uint64_t tcps_rttupdated; /* times we succeeded */
489 uint64_t tcps_delack; /* delayed acks sent */
490 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
491 uint64_t tcps_rexmttimeo; /* retransmit timeouts */
492 uint64_t tcps_persisttimeo; /* persist timeouts */
493 uint64_t tcps_keeptimeo; /* keepalive timeouts */
494 uint64_t tcps_keepprobe; /* keepalive probes sent */
495 uint64_t tcps_keepdrops; /* connections dropped in keepalive */
496
497 uint64_t tcps_sndtotal; /* total packets sent */
498 uint64_t tcps_sndpack; /* data packets sent */
499 uint64_t tcps_sndbyte; /* data bytes sent */
500 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */
501 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
502 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */
503 uint64_t tcps_sndacks; /* ack-only packets sent */
504 uint64_t tcps_sndprobe; /* window probes sent */
505 uint64_t tcps_sndurg; /* packets sent with URG only */
506 uint64_t tcps_sndwinup; /* window update-only packets sent */
507 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
508
509 uint64_t tcps_rcvtotal; /* total packets received */
510 uint64_t tcps_rcvpack; /* packets received in sequence */
511 uint64_t tcps_rcvbyte; /* bytes received in sequence */
512 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */
513 uint64_t tcps_rcvbadoff; /* packets received with bad offset */
514 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */
515 uint64_t tcps_rcvshort; /* packets received too short */
516 uint64_t tcps_rcvduppack; /* duplicate-only packets received */
517 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
518 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */
519 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
520 uint64_t tcps_rcvoopack; /* out-of-order packets received */
521 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */
522 uint64_t tcps_rcvpackafterwin; /* packets with data after window */
523 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
524 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */
525 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */
526 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */
527 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
528 uint64_t tcps_rcvackpack; /* rcvd ack packets */
529 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
530 uint64_t tcps_rcvwinupd; /* rcvd window update packets */
531 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */
532 uint64_t tcps_predack; /* times hdr predict ok for acks */
533 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */
534 uint64_t tcps_pcbcachemiss;
535 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */
536 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */
537 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */
538 uint64_t tcps_usedrtt; /* times RTT initialized from route */
539 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */
540 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/
541 uint64_t tcps_persistdrop; /* timeout in persist state */
542 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */
543 uint64_t tcps_mturesent; /* resends due to MTU discovery */
544 uint64_t tcps_listendrop; /* listen queue overflows */
545 uint64_t tcps_badrst; /* ignored RSTs in the window */
546
547 uint64_t tcps_sc_added; /* entry added to syncache */
548 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
549 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */
550 uint64_t tcps_sc_dropped; /* could not reply to packet */
551 uint64_t tcps_sc_completed; /* successful extraction of entry */
552 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
553 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
554 uint64_t tcps_sc_reset; /* RST removed entry from syncache */
555 uint64_t tcps_sc_stale; /* timed out or listen socket gone */
556 uint64_t tcps_sc_aborted; /* syncache entry aborted */
557 uint64_t tcps_sc_badack; /* removed due to bad ACK */
558 uint64_t tcps_sc_unreach; /* ICMP unreachable received */
559 uint64_t tcps_sc_zonefail; /* zalloc() failed */
560 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */
561 uint64_t tcps_sc_recvcookie; /* SYN cookie received */
562
563 uint64_t tcps_hc_added; /* entry added to hostcache */
564 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
565
566 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
567
568 /* SACK related stats */
569 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
570 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */
571 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
572 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */
573 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */
574 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */
575
576 /* ECN related stats */
577 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */
578 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */
579 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */
580 uint64_t tcps_ecn_shs; /* ECN successful handshakes */
581 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
582
583 /* TCP_SIGNATURE related stats */
584 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */
585 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */
586 uint64_t tcps_sig_err_buildsig; /* Mismatching signature received */
587 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
588 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
589
590 uint64_t _pad[12]; /* 6 UTO, 6 TBD */
591 };
592
593 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */
594
595 #ifdef _KERNEL
596 #define TI_UNLOCKED 1
597 #define TI_RLOCKED 2
598 #include <sys/counter.h>
599
600 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
601 /*
602 * In-kernel consumers can use these accessor macros directly to update
603 * stats.
604 */
605 #define TCPSTAT_ADD(name, val) \
606 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
607 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
608
609 /*
610 * Kernel module consumers must use this accessor macro.
611 */
612 void kmod_tcpstat_inc(int statnum);
613 #define KMOD_TCPSTAT_INC(name) \
614 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t))
615
616 /*
617 * TCP specific helper hook point identifiers.
618 */
619 #define HHOOK_TCP_EST_IN 0
620 #define HHOOK_TCP_EST_OUT 1
621 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
622
623 struct tcp_hhook_data {
624 struct tcpcb *tp;
625 struct tcphdr *th;
626 struct tcpopt *to;
627 long len;
628 int tso;
629 tcp_seq curack;
630 };
631 #endif
632
633 /*
634 * TCB structure exported to user-land via sysctl(3).
635 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
636 * included. Not all of our clients do.
637 */
638 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
639 struct xtcp_timer {
640 int tt_rexmt; /* retransmit timer */
641 int tt_persist; /* retransmit persistence */
642 int tt_keep; /* keepalive */
643 int tt_2msl; /* 2*msl TIME_WAIT timer */
644 int tt_delack; /* delayed ACK timer */
645 int t_rcvtime; /* Time since last packet received */
646 };
647 struct xtcpcb {
648 size_t xt_len;
649 struct inpcb xt_inp;
650 struct tcpcb xt_tp;
651 struct xsocket xt_socket;
652 struct xtcp_timer xt_timer;
653 u_quad_t xt_alignment_hack;
654 char xt_cc_name[TCP_CA_NAME_MAX];
655 };
656 #endif
657
658 /*
659 * Identifiers for TCP sysctl nodes
660 */
661 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
662 #define TCPCTL_MSSDFLT 3 /* MSS default */
663 #define TCPCTL_STATS 4 /* statistics (read-only) */
664 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
665 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
666 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
667 #define TCPCTL_SENDSPACE 8 /* send buffer space */
668 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
669 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
670 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
671 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
672 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
673 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
674 #define TCPCTL_DROP 15 /* drop tcp connection */
675
676 #ifdef _KERNEL
677 #ifdef SYSCTL_DECL
678 SYSCTL_DECL(_net_inet_tcp);
679 SYSCTL_DECL(_net_inet_tcp_sack);
680 MALLOC_DECLARE(M_TCPLOG);
681 #endif
682
683 VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */
684 VNET_DECLARE(struct inpcbinfo, tcbinfo);
685 extern int tcp_log_in_vain;
686 VNET_DECLARE(int, tcp_mssdflt); /* XXX */
687 VNET_DECLARE(int, tcp_minmss);
688 VNET_DECLARE(int, tcp_delack_enabled);
689 VNET_DECLARE(int, tcp_do_rfc3390);
690 VNET_DECLARE(int, tcp_initcwnd_segments);
691 VNET_DECLARE(int, tcp_sendspace);
692 VNET_DECLARE(int, tcp_recvspace);
693 VNET_DECLARE(int, path_mtu_discovery);
694 VNET_DECLARE(int, tcp_do_rfc3465);
695 VNET_DECLARE(int, tcp_abc_l_var);
696 #define V_tcb VNET(tcb)
697 #define V_tcbinfo VNET(tcbinfo)
698 #define V_tcp_mssdflt VNET(tcp_mssdflt)
699 #define V_tcp_minmss VNET(tcp_minmss)
700 #define V_tcp_delack_enabled VNET(tcp_delack_enabled)
701 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
702 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
703 #define V_tcp_sendspace VNET(tcp_sendspace)
704 #define V_tcp_recvspace VNET(tcp_recvspace)
705 #define V_path_mtu_discovery VNET(path_mtu_discovery)
706 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
707 #define V_tcp_abc_l_var VNET(tcp_abc_l_var)
708
709 VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */
710 VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */
711 #define V_tcp_do_sack VNET(tcp_do_sack)
712 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
713
714 VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */
715 VNET_DECLARE(int, tcp_ecn_maxretries);
716 #define V_tcp_do_ecn VNET(tcp_do_ecn)
717 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
718
719 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
720 #define V_tcp_hhh VNET(tcp_hhh)
721
722 VNET_DECLARE(int, tcp_do_rfc6675_pipe);
723 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe)
724
725 int tcp_addoptions(struct tcpopt *, u_char *);
726 int tcp_ccalgounload(struct cc_algo *unload_algo);
727 struct tcpcb *
728 tcp_close(struct tcpcb *);
729 void tcp_discardcb(struct tcpcb *);
730 void tcp_twstart(struct tcpcb *);
731 void tcp_twclose(struct tcptw *, int);
732 void tcp_ctlinput(int, struct sockaddr *, void *);
733 int tcp_ctloutput(struct socket *, struct sockopt *);
734 struct tcpcb *
735 tcp_drop(struct tcpcb *, int);
736 void tcp_drain(void);
737 void tcp_init(void);
738 #ifdef VIMAGE
739 void tcp_destroy(void);
740 #endif
741 void tcp_fini(void *);
742 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
743 const void *);
744 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
745 const void *);
746 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
747 void tcp_reass_global_init(void);
748 void tcp_reass_flush(struct tcpcb *);
749 void tcp_dooptions(struct tcpopt *, u_char *, int, int);
750 void tcp_dropwithreset(struct mbuf *, struct tcphdr *,
751 struct tcpcb *, int, int);
752 void tcp_pulloutofband(struct socket *,
753 struct tcphdr *, struct mbuf *, int);
754 void tcp_xmit_timer(struct tcpcb *, int);
755 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
756 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th,
757 uint16_t type);
758 void cc_conn_init(struct tcpcb *tp);
759 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th);
760 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
761 void hhook_run_tcp_est_in(struct tcpcb *tp,
762 struct tcphdr *th, struct tcpopt *to);
763
764 int tcp_input(struct mbuf **, int *, int);
765 void tcp_do_segment(struct mbuf *, struct tcphdr *,
766 struct socket *, struct tcpcb *, int, int, uint8_t,
767 int);
768
769 int register_tcp_functions(struct tcp_function_block *blk, int wait);
770 int deregister_tcp_functions(struct tcp_function_block *blk);
771 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs);
772 struct tcp_function_block *find_and_ref_tcp_fb(struct tcp_function_block *blk);
773 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp);
774
775 u_long tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
776 u_long tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
777 u_int tcp_maxseg(const struct tcpcb *);
778 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
779 struct tcp_ifcap *);
780 void tcp_mss(struct tcpcb *, int);
781 int tcp_mssopt(struct in_conninfo *);
782 struct inpcb *
783 tcp_drop_syn_sent(struct inpcb *, int);
784 struct tcpcb *
785 tcp_newtcpcb(struct inpcb *);
786 int tcp_output(struct tcpcb *);
787 void tcp_state_change(struct tcpcb *, int);
788 void tcp_respond(struct tcpcb *, void *,
789 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
790 void tcp_tw_init(void);
791 #ifdef VIMAGE
792 void tcp_tw_destroy(void);
793 #endif
794 void tcp_tw_zone_change(void);
795 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
796 struct mbuf *, int);
797 void tcp_setpersist(struct tcpcb *);
798 #ifdef TCP_SIGNATURE
799 struct secasvar;
800 struct secasvar *tcp_get_sav(struct mbuf *, u_int);
801 int tcp_signature_do_compute(struct mbuf *, int, int, u_char *,
802 struct secasvar *);
803 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
804 int tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *,
805 struct tcphdr *, u_int);
806 int tcp_signature_check(struct mbuf *m, int off0, int tlen, int optlen,
807 struct tcpopt *to, struct tcphdr *th, u_int tcpbflag);
808 #endif
809 void tcp_slowtimo(void);
810 struct tcptemp *
811 tcpip_maketemplate(struct inpcb *);
812 void tcpip_fillheaders(struct inpcb *, void *, void *);
813 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
814 int tcp_timer_active(struct tcpcb *, uint32_t);
815 void tcp_timer_stop(struct tcpcb *, uint32_t);
816 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
817 /*
818 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
819 */
820 void tcp_hc_init(void);
821 #ifdef VIMAGE
822 void tcp_hc_destroy(void);
823 #endif
824 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
825 u_long tcp_hc_getmtu(struct in_conninfo *);
826 void tcp_hc_updatemtu(struct in_conninfo *, u_long);
827 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
828
829 extern struct pr_usrreqs tcp_usrreqs;
830 tcp_seq tcp_new_isn(struct tcpcb *);
831
832 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
833 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
834 void tcp_clean_sackreport(struct tcpcb *tp);
835 void tcp_sack_adjust(struct tcpcb *tp);
836 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
837 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
838 void tcp_free_sackholes(struct tcpcb *tp);
839 int tcp_newreno(struct tcpcb *, struct tcphdr *);
840 u_long tcp_seq_subtract(u_long, u_long );
841 int tcp_compute_pipe(struct tcpcb *);
842
843 static inline void
tcp_fields_to_host(struct tcphdr * th)844 tcp_fields_to_host(struct tcphdr *th)
845 {
846
847 th->th_seq = ntohl(th->th_seq);
848 th->th_ack = ntohl(th->th_ack);
849 th->th_win = ntohs(th->th_win);
850 th->th_urp = ntohs(th->th_urp);
851 }
852
853 #ifdef TCP_SIGNATURE
854 static inline void
tcp_fields_to_net(struct tcphdr * th)855 tcp_fields_to_net(struct tcphdr *th)
856 {
857
858 th->th_seq = htonl(th->th_seq);
859 th->th_ack = htonl(th->th_ack);
860 th->th_win = htons(th->th_win);
861 th->th_urp = htons(th->th_urp);
862 }
863 #endif
864 #endif /* _KERNEL */
865
866 #endif /* _NETINET_TCP_VAR_H_ */
867