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: head/sys/netinet/tcp_var.h 288301 2015-09-27 05:29:34Z melifaro $
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
41/*
42 * Kernel variables for tcp.
43 */
44VNET_DECLARE(int, tcp_do_rfc1323);
45#define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323)
46
47#endif /* _KERNEL */
48
49/* TCP segment queue entry */
50struct tseg_qent {
51 LIST_ENTRY(tseg_qent) tqe_q;
52 int tqe_len; /* TCP segment data length */
53 struct tcphdr *tqe_th; /* a pointer to tcp header */
54 struct mbuf *tqe_m; /* mbuf contains packet */
55};
56LIST_HEAD(tsegqe_head, tseg_qent);
57
58struct sackblk {
59 tcp_seq start; /* start seq no. of sack block */
60 tcp_seq end; /* end seq no. */
61};
62
63struct sackhole {
64 tcp_seq start; /* start seq no. of hole */
65 tcp_seq end; /* end seq no. */
66 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
67 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
68};
69
70struct sackhint {
71 struct sackhole *nexthole;
72 int sack_bytes_rexmit;
73 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
74
75 int ispare; /* explicit pad for 64bit alignment */
76 uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */
77};
78
79struct tcptemp {
80 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
81 struct tcphdr tt_t;
82};
83
84#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
85
86/*
87 * Tcp control block, one per tcp; fields:
88 * Organized for 16 byte cacheline efficiency.
89 */
90struct tcpcb {
91 struct tsegqe_head t_segq; /* segment reassembly queue */
92 void *t_pspare[2]; /* new reassembly queue */
93 int t_segqlen; /* segment reassembly queue length */
94 int t_dupacks; /* consecutive dup acks recd */
95
96 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
97
98 struct inpcb *t_inpcb; /* back pointer to internet pcb */
99 int t_state; /* state of this connection */
100 u_int t_flags;
101
102 struct vnet *t_vnet; /* back pointer to parent vnet */
103
104 tcp_seq snd_una; /* sent but unacknowledged */
105 tcp_seq snd_max; /* highest sequence number sent;
106 * used to recognize retransmits
107 */
108 tcp_seq snd_nxt; /* send next */
109 tcp_seq snd_up; /* send urgent pointer */
110
111 tcp_seq snd_wl1; /* window update seg seq number */
112 tcp_seq snd_wl2; /* window update seg ack number */
113 tcp_seq iss; /* initial send sequence number */
114 tcp_seq irs; /* initial receive sequence number */
115
116 tcp_seq rcv_nxt; /* receive next */
117 tcp_seq rcv_adv; /* advertised window */
118 u_long rcv_wnd; /* receive window */
119 tcp_seq rcv_up; /* receive urgent pointer */
120
121 u_long snd_wnd; /* send window */
122 u_long snd_cwnd; /* congestion-controlled window */
123 u_long snd_spare1; /* unused */
124 u_long snd_ssthresh; /* snd_cwnd size threshold for
125 * for slow start exponential to
126 * linear switch
127 */
128 u_long snd_spare2; /* unused */
129 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
130
131 u_int t_maxopd; /* mss plus options */
132
133 u_int t_rcvtime; /* inactivity time */
134 u_int t_starttime; /* time connection was established */
135 u_int t_rtttime; /* RTT measurement start time */
136 tcp_seq t_rtseq; /* sequence number being timed */
137
138 u_int t_bw_spare1; /* unused */
139 tcp_seq t_bw_spare2; /* unused */
140
141 int t_rxtcur; /* current retransmit value (ticks) */
142 u_int t_maxseg; /* maximum segment size */
143 int t_srtt; /* smoothed round-trip time */
144 int t_rttvar; /* variance in round-trip time */
145
146 int t_rxtshift; /* log(2) of rexmt exp. backoff */
147 u_int t_rttmin; /* minimum rtt allowed */
148 u_int t_rttbest; /* best rtt we've seen */
149 u_long t_rttupdated; /* number of times rtt sampled */
150 u_long max_sndwnd; /* largest window peer has offered */
151
152 int t_softerror; /* possible error not yet reported */
153/* out-of-band data */
154 char t_oobflags; /* have some */
155 char t_iobc; /* input character */
156/* RFC 1323 variables */
157 u_char snd_scale; /* window scaling for send window */
158 u_char rcv_scale; /* window scaling for recv window */
159 u_char request_r_scale; /* pending window scaling */
160 u_int32_t ts_recent; /* timestamp echo data */
161 u_int ts_recent_age; /* when last updated */
162 u_int32_t ts_offset; /* our timestamp offset */
163
164 tcp_seq last_ack_sent;
165/* experimental */
166 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
167 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
168 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
169 int t_sndzerowin; /* zero-window updates sent */
170 u_int t_badrxtwin; /* window for retransmit recovery */
171 u_char snd_limited; /* segments limited transmitted */
172/* SACK related state */
173 int snd_numholes; /* number of holes seen by sender */
174 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
175 /* SACK scoreboard (sorted) */
176 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
177 int rcv_numsacks; /* # distinct sack blks present */
178 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
179 tcp_seq sack_newdata; /* New data xmitted in this recovery
180 episode starts at this seq number */
181 struct sackhint sackhint; /* SACK scoreboard hint */
182 int t_rttlow; /* smallest observerved RTT */
183 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
184 int rfbuf_cnt; /* recv buffer autoscaling byte count */
185 struct toedev *tod; /* toedev handling this connection */
186 int t_sndrexmitpack; /* retransmit packets sent */
187 int t_rcvoopack; /* out-of-order packets received */
188 void *t_toe; /* TOE pcb pointer */
189 int t_bytes_acked; /* # bytes acked during current RTT */
190 struct cc_algo *cc_algo; /* congestion control algorithm */
191 struct cc_var *ccv; /* congestion control specific vars */
192 struct osd *osd; /* storage for Khelp module data */
193
194 u_int t_keepinit; /* time to establish connection */
195 u_int t_keepidle; /* time before keepalive probes begin */
196 u_int t_keepintvl; /* interval between keepalives */
197 u_int t_keepcnt; /* number of keepalives before close */
198
199 u_int t_tsomax; /* TSO total burst length limit in bytes */
200 u_int t_tsomaxsegcount; /* TSO maximum segment count */
201 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
202 u_int t_pmtud_saved_maxopd; /* pre-blackhole MSS */
203 u_int t_flags2; /* More tcpcb flags storage */
204
205 uint32_t t_ispare[8]; /* 5 UTO, 3 TBD */
206 void *t_pspare2[4]; /* 1 TCP_SIGNATURE, 3 TBD */
207 uint64_t _pad[6]; /* 6 TBD (1-2 CC/RTT?) */
208};
209
210/*
211 * Flags and utility macros for the t_flags field.
212 */
213#define TF_ACKNOW 0x000001 /* ack peer immediately */
214#define TF_DELACK 0x000002 /* ack, but try to delay it */
215#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
216#define TF_NOOPT 0x000008 /* don't use tcp options */
217#define TF_SENTFIN 0x000010 /* have sent FIN */
218#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
219#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
220#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
221#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
222#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
223#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
224#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
225#define TF_NOPUSH 0x001000 /* don't push */
226#define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */
227#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
228#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
229#define TF_LASTIDLE 0x040000 /* connection was previously idle */
230#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
231#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
232#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
233#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
234#define TF_FORCEDATA 0x800000 /* force out a byte */
235#define TF_TSO 0x1000000 /* TSO enabled on this connection */
236#define TF_TOE 0x2000000 /* this connection is offloaded */
237#define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
238#define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
239#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
240#define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
241#define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
242
243#define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
244#define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
245#define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
246
247#define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
248#define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
249#define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
250
251#define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
252#define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
253#define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
254
255#define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
256
257/*
258 * Flags for the t_oobflags field.
259 */
260#define TCPOOB_HAVEDATA 0x01
261#define TCPOOB_HADDATA 0x02
262
263#ifdef TCP_SIGNATURE
264/*
265 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
266 * for SADB verification and lookup.
267 */
268#define TCP_SIGLEN 16 /* length of computed digest in bytes */
269#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
270#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
271/*
272 * Only a single SA per host may be specified at this time. An SPI is
273 * needed in order for the KEY_ALLOCSA() lookup to work.
274 */
275#define TCP_SIG_SPI 0x1000
276#endif /* TCP_SIGNATURE */
277
278/*
279 * Flags for PLPMTU handling, t_flags2
280 */
281#define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
282#define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
283#define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
284
285/*
286 * Structure to hold TCP options that are only used during segment
287 * processing (in tcp_input), but not held in the tcpcb.
288 * It's basically used to reduce the number of parameters
289 * to tcp_dooptions and tcp_addoptions.
290 * The binary order of the to_flags is relevant for packing of the
291 * options in tcp_addoptions.
292 */
293struct tcpopt {
294 u_int64_t to_flags; /* which options are present */
295#define TOF_MSS 0x0001 /* maximum segment size */
296#define TOF_SCALE 0x0002 /* window scaling */
297#define TOF_SACKPERM 0x0004 /* SACK permitted */
298#define TOF_TS 0x0010 /* timestamp */
299#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
300#define TOF_SACK 0x0080 /* Peer sent SACK option */
301#define TOF_MAXOPT 0x0100
302 u_int32_t to_tsval; /* new timestamp */
303 u_int32_t to_tsecr; /* reflected timestamp */
304 u_char *to_sacks; /* pointer to the first SACK blocks */
305 u_char *to_signature; /* pointer to the TCP-MD5 signature */
306 u_int16_t to_mss; /* maximum segment size */
307 u_int8_t to_wscale; /* window scaling */
308 u_int8_t to_nsacks; /* number of SACK blocks */
309 u_int32_t to_spare; /* UTO */
310};
311
312/*
313 * Flags for tcp_dooptions.
314 */
315#define TO_SYN 0x01 /* parse SYN-only options */
316
317struct hc_metrics_lite { /* must stay in sync with hc_metrics */
318 u_long rmx_mtu; /* MTU for this path */
319 u_long rmx_ssthresh; /* outbound gateway buffer limit */
320 u_long rmx_rtt; /* estimated round trip time */
321 u_long rmx_rttvar; /* estimated rtt variance */
322 u_long rmx_bandwidth; /* estimated bandwidth */
323 u_long rmx_cwnd; /* congestion window */
324 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
325 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
326};
327
328/*
329 * Used by tcp_maxmtu() to communicate interface specific features
330 * and limits at the time of connection setup.
331 */
332struct tcp_ifcap {
333 int ifcap;
334 u_int tsomax;
335 u_int tsomaxsegcount;
336 u_int tsomaxsegsize;
337};
338
339#ifndef _NETINET_IN_PCB_H_
340struct in_conninfo;
341#endif /* _NETINET_IN_PCB_H_ */
342
343struct tcptw {
344 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
345 tcp_seq snd_nxt;
346 tcp_seq rcv_nxt;
347 tcp_seq iss;
348 tcp_seq irs;
349 u_short last_win; /* cached window value */
350 u_short tw_so_options; /* copy of so_options */
351 struct ucred *tw_cred; /* user credentials */
352 u_int32_t t_recent;
353 u_int32_t ts_offset; /* our timestamp offset */
354 u_int t_starttime;
355 int tw_time;
356 TAILQ_ENTRY(tcptw) tw_2msl;
357 void *tw_pspare; /* TCP_SIGNATURE */
358 u_int *tw_spare; /* TCP_SIGNATURE */
359};
360
361#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
362#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
363#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
364
365/*
366 * The smoothed round-trip time and estimated variance
367 * are stored as fixed point numbers scaled by the values below.
368 * For convenience, these scales are also used in smoothing the average
369 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
370 * With these scales, srtt has 3 bits to the right of the binary point,
371 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
372 * binary point, and is smoothed with an ALPHA of 0.75.
373 */
374#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
375#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
376#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
377#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
378#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
379
380/*
381 * The initial retransmission should happen at rtt + 4 * rttvar.
382 * Because of the way we do the smoothing, srtt and rttvar
383 * will each average +1/2 tick of bias. When we compute
384 * the retransmit timer, we want 1/2 tick of rounding and
385 * 1 extra tick because of +-1/2 tick uncertainty in the
386 * firing of the timer. The bias will give us exactly the
387 * 1.5 tick we need. But, because the bias is
388 * statistical, we have to test that we don't drop below
389 * the minimum feasible timer (which is 2 ticks).
390 * This version of the macro adapted from a paper by Lawrence
391 * Brakmo and Larry Peterson which outlines a problem caused
392 * by insufficient precision in the original implementation,
393 * which results in inappropriately large RTO values for very
394 * fast networks.
395 */
396#define TCP_REXMTVAL(tp) \
397 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
398 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
399
400/*
401 * TCP statistics.
402 * Many of these should be kept per connection,
403 * but that's inconvenient at the moment.
404 */
405struct tcpstat {
406 uint64_t tcps_connattempt; /* connections initiated */
407 uint64_t tcps_accepts; /* connections accepted */
408 uint64_t tcps_connects; /* connections established */
409 uint64_t tcps_drops; /* connections dropped */
410 uint64_t tcps_conndrops; /* embryonic connections dropped */
411 uint64_t tcps_minmssdrops; /* average minmss too low drops */
412 uint64_t tcps_closed; /* conn. closed (includes drops) */
413 uint64_t tcps_segstimed; /* segs where we tried to get rtt */
414 uint64_t tcps_rttupdated; /* times we succeeded */
415 uint64_t tcps_delack; /* delayed acks sent */
416 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
417 uint64_t tcps_rexmttimeo; /* retransmit timeouts */
418 uint64_t tcps_persisttimeo; /* persist timeouts */
419 uint64_t tcps_keeptimeo; /* keepalive timeouts */
420 uint64_t tcps_keepprobe; /* keepalive probes sent */
421 uint64_t tcps_keepdrops; /* connections dropped in keepalive */
422
423 uint64_t tcps_sndtotal; /* total packets sent */
424 uint64_t tcps_sndpack; /* data packets sent */
425 uint64_t tcps_sndbyte; /* data bytes sent */
426 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */
427 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
428 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */
429 uint64_t tcps_sndacks; /* ack-only packets sent */
430 uint64_t tcps_sndprobe; /* window probes sent */
431 uint64_t tcps_sndurg; /* packets sent with URG only */
432 uint64_t tcps_sndwinup; /* window update-only packets sent */
433 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
434
435 uint64_t tcps_rcvtotal; /* total packets received */
436 uint64_t tcps_rcvpack; /* packets received in sequence */
437 uint64_t tcps_rcvbyte; /* bytes received in sequence */
438 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */
439 uint64_t tcps_rcvbadoff; /* packets received with bad offset */
440 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */
441 uint64_t tcps_rcvshort; /* packets received too short */
442 uint64_t tcps_rcvduppack; /* duplicate-only packets received */
443 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
444 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */
445 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
446 uint64_t tcps_rcvoopack; /* out-of-order packets received */
447 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */
448 uint64_t tcps_rcvpackafterwin; /* packets with data after window */
449 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
450 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */
451 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */
452 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */
453 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
454 uint64_t tcps_rcvackpack; /* rcvd ack packets */
455 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
456 uint64_t tcps_rcvwinupd; /* rcvd window update packets */
457 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */
458 uint64_t tcps_predack; /* times hdr predict ok for acks */
459 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */
460 uint64_t tcps_pcbcachemiss;
461 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */
462 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */
463 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */
464 uint64_t tcps_usedrtt; /* times RTT initialized from route */
465 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */
466 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/
467 uint64_t tcps_persistdrop; /* timeout in persist state */
468 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */
469 uint64_t tcps_mturesent; /* resends due to MTU discovery */
470 uint64_t tcps_listendrop; /* listen queue overflows */
471 uint64_t tcps_badrst; /* ignored RSTs in the window */
472
473 uint64_t tcps_sc_added; /* entry added to syncache */
474 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
475 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */
476 uint64_t tcps_sc_dropped; /* could not reply to packet */
477 uint64_t tcps_sc_completed; /* successful extraction of entry */
478 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
479 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
480 uint64_t tcps_sc_reset; /* RST removed entry from syncache */
481 uint64_t tcps_sc_stale; /* timed out or listen socket gone */
482 uint64_t tcps_sc_aborted; /* syncache entry aborted */
483 uint64_t tcps_sc_badack; /* removed due to bad ACK */
484 uint64_t tcps_sc_unreach; /* ICMP unreachable received */
485 uint64_t tcps_sc_zonefail; /* zalloc() failed */
486 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */
487 uint64_t tcps_sc_recvcookie; /* SYN cookie received */
488
489 uint64_t tcps_hc_added; /* entry added to hostcache */
490 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
491
492 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
493
494 /* SACK related stats */
495 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
496 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */
497 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
498 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */
499 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */
500 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */
501
502 /* ECN related stats */
503 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */
504 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */
505 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */
506 uint64_t tcps_ecn_shs; /* ECN successful handshakes */
507 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
508
509 /* TCP_SIGNATURE related stats */
510 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */
511 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */
512 uint64_t tcps_sig_err_buildsig; /* Mismatching signature received */
513 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
514 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
515
516 uint64_t _pad[12]; /* 6 UTO, 6 TBD */
517};
518
519#define tcps_rcvmemdrop tcps_rcvreassfull /* compat */
520
521#ifdef _KERNEL
522#include <sys/counter.h>
523
524VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
525/*
526 * In-kernel consumers can use these accessor macros directly to update
527 * stats.
528 */
529#define TCPSTAT_ADD(name, val) \
530 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
531#define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
532
533/*
534 * Kernel module consumers must use this accessor macro.
535 */
536void kmod_tcpstat_inc(int statnum);
537#define KMOD_TCPSTAT_INC(name) \
538 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t))
539
540/*
541 * TCP specific helper hook point identifiers.
542 */
543#define HHOOK_TCP_EST_IN 0
544#define HHOOK_TCP_EST_OUT 1
545#define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
546
547struct tcp_hhook_data {
548 struct tcpcb *tp;
549 struct tcphdr *th;
550 struct tcpopt *to;
551 long len;
552 int tso;
553 tcp_seq curack;
554};
555#endif
556
557/*
558 * TCB structure exported to user-land via sysctl(3).
559 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
560 * included. Not all of our clients do.
561 */
562#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
563struct xtcp_timer {
564 int tt_rexmt; /* retransmit timer */
565 int tt_persist; /* retransmit persistence */
566 int tt_keep; /* keepalive */
567 int tt_2msl; /* 2*msl TIME_WAIT timer */
568 int tt_delack; /* delayed ACK timer */
569 int t_rcvtime; /* Time since last packet received */
570};
571struct xtcpcb {
572 size_t xt_len;
573 struct inpcb xt_inp;
574 struct tcpcb xt_tp;
575 struct xsocket xt_socket;
576 struct xtcp_timer xt_timer;
577 u_quad_t xt_alignment_hack;
578};
579#endif
580
581/*
582 * Identifiers for TCP sysctl nodes
583 */
584#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
585#define TCPCTL_MSSDFLT 3 /* MSS default */
586#define TCPCTL_STATS 4 /* statistics (read-only) */
587#define TCPCTL_RTTDFLT 5 /* default RTT estimate */
588#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
589#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
590#define TCPCTL_SENDSPACE 8 /* send buffer space */
591#define TCPCTL_RECVSPACE 9 /* receive buffer space */
592#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
593#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
594#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
595#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
596#define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
597#define TCPCTL_DROP 15 /* drop tcp connection */
598
599#ifdef _KERNEL
600#ifdef SYSCTL_DECL
601SYSCTL_DECL(_net_inet_tcp);
602SYSCTL_DECL(_net_inet_tcp_sack);
603MALLOC_DECLARE(M_TCPLOG);
604#endif
605
606VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */
607VNET_DECLARE(struct inpcbinfo, tcbinfo);
608extern int tcp_log_in_vain;
609VNET_DECLARE(int, tcp_mssdflt); /* XXX */
610VNET_DECLARE(int, tcp_minmss);
611VNET_DECLARE(int, tcp_delack_enabled);
612VNET_DECLARE(int, tcp_do_rfc3390);
613VNET_DECLARE(int, tcp_do_initcwnd10);
614VNET_DECLARE(int, tcp_sendspace);
615VNET_DECLARE(int, tcp_recvspace);
616VNET_DECLARE(int, path_mtu_discovery);
617VNET_DECLARE(int, tcp_do_rfc3465);
618VNET_DECLARE(int, tcp_abc_l_var);
619#define V_tcb VNET(tcb)
620#define V_tcbinfo VNET(tcbinfo)
621#define V_tcp_mssdflt VNET(tcp_mssdflt)
622#define V_tcp_minmss VNET(tcp_minmss)
623#define V_tcp_delack_enabled VNET(tcp_delack_enabled)
624#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
625#define V_tcp_do_initcwnd10 VNET(tcp_do_initcwnd10)
626#define V_tcp_sendspace VNET(tcp_sendspace)
627#define V_tcp_recvspace VNET(tcp_recvspace)
628#define V_path_mtu_discovery VNET(path_mtu_discovery)
629#define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
630#define V_tcp_abc_l_var VNET(tcp_abc_l_var)
631
632VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */
633VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */
634#define V_tcp_do_sack VNET(tcp_do_sack)
635#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
636
637VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */
638VNET_DECLARE(int, tcp_ecn_maxretries);
639#define V_tcp_do_ecn VNET(tcp_do_ecn)
640#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
641
642VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
643#define V_tcp_hhh VNET(tcp_hhh)
644
645int tcp_addoptions(struct tcpopt *, u_char *);
646int tcp_ccalgounload(struct cc_algo *unload_algo);
647struct tcpcb *
648 tcp_close(struct tcpcb *);
649void tcp_discardcb(struct tcpcb *);
650void tcp_twstart(struct tcpcb *);
651void tcp_twclose(struct tcptw *, int);
652void tcp_ctlinput(int, struct sockaddr *, void *);
653int tcp_ctloutput(struct socket *, struct sockopt *);
654struct tcpcb *
655 tcp_drop(struct tcpcb *, int);
656void tcp_drain(void);
657void tcp_init(void);
658#ifdef VIMAGE
659void tcp_destroy(void);
660#endif
661void tcp_fini(void *);
662char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
663 const void *);
664char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
665 const void *);
666int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
667void tcp_reass_global_init(void);
668void tcp_reass_flush(struct tcpcb *);
669int tcp_input(struct mbuf **, int *, int);
670u_long tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
671u_long tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
672void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
673 struct tcp_ifcap *);
674void tcp_mss(struct tcpcb *, int);
675int tcp_mssopt(struct in_conninfo *);
676struct inpcb *
677 tcp_drop_syn_sent(struct inpcb *, int);
678struct tcpcb *
679 tcp_newtcpcb(struct inpcb *);
680int tcp_output(struct tcpcb *);
681void tcp_state_change(struct tcpcb *, int);
682void tcp_respond(struct tcpcb *, void *,
683 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
684void tcp_tw_init(void);
685#ifdef VIMAGE
686void tcp_tw_destroy(void);
687#endif
688void tcp_tw_zone_change(void);
689int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
690 struct mbuf *, int);
691void tcp_setpersist(struct tcpcb *);
692#ifdef TCP_SIGNATURE
693struct secasvar;
694struct secasvar *tcp_get_sav(struct mbuf *, u_int);
695int tcp_signature_do_compute(struct mbuf *, int, int, u_char *,
696 struct secasvar *);
697int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
698int tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *,
699 struct tcphdr *, u_int);
700int tcp_signature_check(struct mbuf *m, int off0, int tlen, int optlen,
701 struct tcpopt *to, struct tcphdr *th, u_int tcpbflag);
702#endif
703void tcp_slowtimo(void);
704struct tcptemp *
705 tcpip_maketemplate(struct inpcb *);
706void tcpip_fillheaders(struct inpcb *, void *, void *);
707void tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
708int tcp_timer_active(struct tcpcb *, uint32_t);
709void tcp_timer_stop(struct tcpcb *, uint32_t);
710void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
711/*
712 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
713 */
714void tcp_hc_init(void);
715#ifdef VIMAGE
716void tcp_hc_destroy(void);
717#endif
718void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
719u_long tcp_hc_getmtu(struct in_conninfo *);
720void tcp_hc_updatemtu(struct in_conninfo *, u_long);
721void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
722
723extern struct pr_usrreqs tcp_usrreqs;
724tcp_seq tcp_new_isn(struct tcpcb *);
725
726void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
727void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
728void tcp_clean_sackreport(struct tcpcb *tp);
729void tcp_sack_adjust(struct tcpcb *tp);
730struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
731void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
732void tcp_free_sackholes(struct tcpcb *tp);
733int tcp_newreno(struct tcpcb *, struct tcphdr *);
734u_long tcp_seq_subtract(u_long, u_long );
735
736void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
737
738static inline void
739tcp_fields_to_host(struct tcphdr *th)
740{
741
742 th->th_seq = ntohl(th->th_seq);
743 th->th_ack = ntohl(th->th_ack);
744 th->th_win = ntohs(th->th_win);
745 th->th_urp = ntohs(th->th_urp);
746}
747
748#ifdef TCP_SIGNATURE
749static inline void
750tcp_fields_to_net(struct tcphdr *th)
751{
752
753 th->th_seq = htonl(th->th_seq);
754 th->th_ack = htonl(th->th_ack);
755 th->th_win = htons(th->th_win);
756 th->th_urp = htons(th->th_urp);
757}
758#endif
759#endif /* _KERNEL */
760
761#endif /* _NETINET_TCP_VAR_H_ */
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: head/sys/netinet/tcp_var.h 288301 2015-09-27 05:29:34Z melifaro $
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
41/*
42 * Kernel variables for tcp.
43 */
44VNET_DECLARE(int, tcp_do_rfc1323);
45#define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323)
46
47#endif /* _KERNEL */
48
49/* TCP segment queue entry */
50struct tseg_qent {
51 LIST_ENTRY(tseg_qent) tqe_q;
52 int tqe_len; /* TCP segment data length */
53 struct tcphdr *tqe_th; /* a pointer to tcp header */
54 struct mbuf *tqe_m; /* mbuf contains packet */
55};
56LIST_HEAD(tsegqe_head, tseg_qent);
57
58struct sackblk {
59 tcp_seq start; /* start seq no. of sack block */
60 tcp_seq end; /* end seq no. */
61};
62
63struct sackhole {
64 tcp_seq start; /* start seq no. of hole */
65 tcp_seq end; /* end seq no. */
66 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
67 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
68};
69
70struct sackhint {
71 struct sackhole *nexthole;
72 int sack_bytes_rexmit;
73 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
74
75 int ispare; /* explicit pad for 64bit alignment */
76 uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */
77};
78
79struct tcptemp {
80 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
81 struct tcphdr tt_t;
82};
83
84#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
85
86/*
87 * Tcp control block, one per tcp; fields:
88 * Organized for 16 byte cacheline efficiency.
89 */
90struct tcpcb {
91 struct tsegqe_head t_segq; /* segment reassembly queue */
92 void *t_pspare[2]; /* new reassembly queue */
93 int t_segqlen; /* segment reassembly queue length */
94 int t_dupacks; /* consecutive dup acks recd */
95
96 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
97
98 struct inpcb *t_inpcb; /* back pointer to internet pcb */
99 int t_state; /* state of this connection */
100 u_int t_flags;
101
102 struct vnet *t_vnet; /* back pointer to parent vnet */
103
104 tcp_seq snd_una; /* sent but unacknowledged */
105 tcp_seq snd_max; /* highest sequence number sent;
106 * used to recognize retransmits
107 */
108 tcp_seq snd_nxt; /* send next */
109 tcp_seq snd_up; /* send urgent pointer */
110
111 tcp_seq snd_wl1; /* window update seg seq number */
112 tcp_seq snd_wl2; /* window update seg ack number */
113 tcp_seq iss; /* initial send sequence number */
114 tcp_seq irs; /* initial receive sequence number */
115
116 tcp_seq rcv_nxt; /* receive next */
117 tcp_seq rcv_adv; /* advertised window */
118 u_long rcv_wnd; /* receive window */
119 tcp_seq rcv_up; /* receive urgent pointer */
120
121 u_long snd_wnd; /* send window */
122 u_long snd_cwnd; /* congestion-controlled window */
123 u_long snd_spare1; /* unused */
124 u_long snd_ssthresh; /* snd_cwnd size threshold for
125 * for slow start exponential to
126 * linear switch
127 */
128 u_long snd_spare2; /* unused */
129 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
130
131 u_int t_maxopd; /* mss plus options */
132
133 u_int t_rcvtime; /* inactivity time */
134 u_int t_starttime; /* time connection was established */
135 u_int t_rtttime; /* RTT measurement start time */
136 tcp_seq t_rtseq; /* sequence number being timed */
137
138 u_int t_bw_spare1; /* unused */
139 tcp_seq t_bw_spare2; /* unused */
140
141 int t_rxtcur; /* current retransmit value (ticks) */
142 u_int t_maxseg; /* maximum segment size */
143 int t_srtt; /* smoothed round-trip time */
144 int t_rttvar; /* variance in round-trip time */
145
146 int t_rxtshift; /* log(2) of rexmt exp. backoff */
147 u_int t_rttmin; /* minimum rtt allowed */
148 u_int t_rttbest; /* best rtt we've seen */
149 u_long t_rttupdated; /* number of times rtt sampled */
150 u_long max_sndwnd; /* largest window peer has offered */
151
152 int t_softerror; /* possible error not yet reported */
153/* out-of-band data */
154 char t_oobflags; /* have some */
155 char t_iobc; /* input character */
156/* RFC 1323 variables */
157 u_char snd_scale; /* window scaling for send window */
158 u_char rcv_scale; /* window scaling for recv window */
159 u_char request_r_scale; /* pending window scaling */
160 u_int32_t ts_recent; /* timestamp echo data */
161 u_int ts_recent_age; /* when last updated */
162 u_int32_t ts_offset; /* our timestamp offset */
163
164 tcp_seq last_ack_sent;
165/* experimental */
166 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
167 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
168 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
169 int t_sndzerowin; /* zero-window updates sent */
170 u_int t_badrxtwin; /* window for retransmit recovery */
171 u_char snd_limited; /* segments limited transmitted */
172/* SACK related state */
173 int snd_numholes; /* number of holes seen by sender */
174 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
175 /* SACK scoreboard (sorted) */
176 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
177 int rcv_numsacks; /* # distinct sack blks present */
178 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
179 tcp_seq sack_newdata; /* New data xmitted in this recovery
180 episode starts at this seq number */
181 struct sackhint sackhint; /* SACK scoreboard hint */
182 int t_rttlow; /* smallest observerved RTT */
183 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
184 int rfbuf_cnt; /* recv buffer autoscaling byte count */
185 struct toedev *tod; /* toedev handling this connection */
186 int t_sndrexmitpack; /* retransmit packets sent */
187 int t_rcvoopack; /* out-of-order packets received */
188 void *t_toe; /* TOE pcb pointer */
189 int t_bytes_acked; /* # bytes acked during current RTT */
190 struct cc_algo *cc_algo; /* congestion control algorithm */
191 struct cc_var *ccv; /* congestion control specific vars */
192 struct osd *osd; /* storage for Khelp module data */
193
194 u_int t_keepinit; /* time to establish connection */
195 u_int t_keepidle; /* time before keepalive probes begin */
196 u_int t_keepintvl; /* interval between keepalives */
197 u_int t_keepcnt; /* number of keepalives before close */
198
199 u_int t_tsomax; /* TSO total burst length limit in bytes */
200 u_int t_tsomaxsegcount; /* TSO maximum segment count */
201 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
202 u_int t_pmtud_saved_maxopd; /* pre-blackhole MSS */
203 u_int t_flags2; /* More tcpcb flags storage */
204
205 uint32_t t_ispare[8]; /* 5 UTO, 3 TBD */
206 void *t_pspare2[4]; /* 1 TCP_SIGNATURE, 3 TBD */
207 uint64_t _pad[6]; /* 6 TBD (1-2 CC/RTT?) */
208};
209
210/*
211 * Flags and utility macros for the t_flags field.
212 */
213#define TF_ACKNOW 0x000001 /* ack peer immediately */
214#define TF_DELACK 0x000002 /* ack, but try to delay it */
215#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
216#define TF_NOOPT 0x000008 /* don't use tcp options */
217#define TF_SENTFIN 0x000010 /* have sent FIN */
218#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
219#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
220#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
221#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
222#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
223#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
224#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
225#define TF_NOPUSH 0x001000 /* don't push */
226#define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */
227#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
228#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
229#define TF_LASTIDLE 0x040000 /* connection was previously idle */
230#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
231#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
232#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
233#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
234#define TF_FORCEDATA 0x800000 /* force out a byte */
235#define TF_TSO 0x1000000 /* TSO enabled on this connection */
236#define TF_TOE 0x2000000 /* this connection is offloaded */
237#define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
238#define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
239#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
240#define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
241#define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
242
243#define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
244#define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
245#define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
246
247#define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
248#define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
249#define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
250
251#define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
252#define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
253#define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
254
255#define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
256
257/*
258 * Flags for the t_oobflags field.
259 */
260#define TCPOOB_HAVEDATA 0x01
261#define TCPOOB_HADDATA 0x02
262
263#ifdef TCP_SIGNATURE
264/*
265 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
266 * for SADB verification and lookup.
267 */
268#define TCP_SIGLEN 16 /* length of computed digest in bytes */
269#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
270#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
271/*
272 * Only a single SA per host may be specified at this time. An SPI is
273 * needed in order for the KEY_ALLOCSA() lookup to work.
274 */
275#define TCP_SIG_SPI 0x1000
276#endif /* TCP_SIGNATURE */
277
278/*
279 * Flags for PLPMTU handling, t_flags2
280 */
281#define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
282#define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
283#define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
284
285/*
286 * Structure to hold TCP options that are only used during segment
287 * processing (in tcp_input), but not held in the tcpcb.
288 * It's basically used to reduce the number of parameters
289 * to tcp_dooptions and tcp_addoptions.
290 * The binary order of the to_flags is relevant for packing of the
291 * options in tcp_addoptions.
292 */
293struct tcpopt {
294 u_int64_t to_flags; /* which options are present */
295#define TOF_MSS 0x0001 /* maximum segment size */
296#define TOF_SCALE 0x0002 /* window scaling */
297#define TOF_SACKPERM 0x0004 /* SACK permitted */
298#define TOF_TS 0x0010 /* timestamp */
299#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
300#define TOF_SACK 0x0080 /* Peer sent SACK option */
301#define TOF_MAXOPT 0x0100
302 u_int32_t to_tsval; /* new timestamp */
303 u_int32_t to_tsecr; /* reflected timestamp */
304 u_char *to_sacks; /* pointer to the first SACK blocks */
305 u_char *to_signature; /* pointer to the TCP-MD5 signature */
306 u_int16_t to_mss; /* maximum segment size */
307 u_int8_t to_wscale; /* window scaling */
308 u_int8_t to_nsacks; /* number of SACK blocks */
309 u_int32_t to_spare; /* UTO */
310};
311
312/*
313 * Flags for tcp_dooptions.
314 */
315#define TO_SYN 0x01 /* parse SYN-only options */
316
317struct hc_metrics_lite { /* must stay in sync with hc_metrics */
318 u_long rmx_mtu; /* MTU for this path */
319 u_long rmx_ssthresh; /* outbound gateway buffer limit */
320 u_long rmx_rtt; /* estimated round trip time */
321 u_long rmx_rttvar; /* estimated rtt variance */
322 u_long rmx_bandwidth; /* estimated bandwidth */
323 u_long rmx_cwnd; /* congestion window */
324 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
325 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
326};
327
328/*
329 * Used by tcp_maxmtu() to communicate interface specific features
330 * and limits at the time of connection setup.
331 */
332struct tcp_ifcap {
333 int ifcap;
334 u_int tsomax;
335 u_int tsomaxsegcount;
336 u_int tsomaxsegsize;
337};
338
339#ifndef _NETINET_IN_PCB_H_
340struct in_conninfo;
341#endif /* _NETINET_IN_PCB_H_ */
342
343struct tcptw {
344 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
345 tcp_seq snd_nxt;
346 tcp_seq rcv_nxt;
347 tcp_seq iss;
348 tcp_seq irs;
349 u_short last_win; /* cached window value */
350 u_short tw_so_options; /* copy of so_options */
351 struct ucred *tw_cred; /* user credentials */
352 u_int32_t t_recent;
353 u_int32_t ts_offset; /* our timestamp offset */
354 u_int t_starttime;
355 int tw_time;
356 TAILQ_ENTRY(tcptw) tw_2msl;
357 void *tw_pspare; /* TCP_SIGNATURE */
358 u_int *tw_spare; /* TCP_SIGNATURE */
359};
360
361#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
362#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
363#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
364
365/*
366 * The smoothed round-trip time and estimated variance
367 * are stored as fixed point numbers scaled by the values below.
368 * For convenience, these scales are also used in smoothing the average
369 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
370 * With these scales, srtt has 3 bits to the right of the binary point,
371 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
372 * binary point, and is smoothed with an ALPHA of 0.75.
373 */
374#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
375#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
376#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
377#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
378#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
379
380/*
381 * The initial retransmission should happen at rtt + 4 * rttvar.
382 * Because of the way we do the smoothing, srtt and rttvar
383 * will each average +1/2 tick of bias. When we compute
384 * the retransmit timer, we want 1/2 tick of rounding and
385 * 1 extra tick because of +-1/2 tick uncertainty in the
386 * firing of the timer. The bias will give us exactly the
387 * 1.5 tick we need. But, because the bias is
388 * statistical, we have to test that we don't drop below
389 * the minimum feasible timer (which is 2 ticks).
390 * This version of the macro adapted from a paper by Lawrence
391 * Brakmo and Larry Peterson which outlines a problem caused
392 * by insufficient precision in the original implementation,
393 * which results in inappropriately large RTO values for very
394 * fast networks.
395 */
396#define TCP_REXMTVAL(tp) \
397 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
398 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
399
400/*
401 * TCP statistics.
402 * Many of these should be kept per connection,
403 * but that's inconvenient at the moment.
404 */
405struct tcpstat {
406 uint64_t tcps_connattempt; /* connections initiated */
407 uint64_t tcps_accepts; /* connections accepted */
408 uint64_t tcps_connects; /* connections established */
409 uint64_t tcps_drops; /* connections dropped */
410 uint64_t tcps_conndrops; /* embryonic connections dropped */
411 uint64_t tcps_minmssdrops; /* average minmss too low drops */
412 uint64_t tcps_closed; /* conn. closed (includes drops) */
413 uint64_t tcps_segstimed; /* segs where we tried to get rtt */
414 uint64_t tcps_rttupdated; /* times we succeeded */
415 uint64_t tcps_delack; /* delayed acks sent */
416 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
417 uint64_t tcps_rexmttimeo; /* retransmit timeouts */
418 uint64_t tcps_persisttimeo; /* persist timeouts */
419 uint64_t tcps_keeptimeo; /* keepalive timeouts */
420 uint64_t tcps_keepprobe; /* keepalive probes sent */
421 uint64_t tcps_keepdrops; /* connections dropped in keepalive */
422
423 uint64_t tcps_sndtotal; /* total packets sent */
424 uint64_t tcps_sndpack; /* data packets sent */
425 uint64_t tcps_sndbyte; /* data bytes sent */
426 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */
427 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
428 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */
429 uint64_t tcps_sndacks; /* ack-only packets sent */
430 uint64_t tcps_sndprobe; /* window probes sent */
431 uint64_t tcps_sndurg; /* packets sent with URG only */
432 uint64_t tcps_sndwinup; /* window update-only packets sent */
433 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
434
435 uint64_t tcps_rcvtotal; /* total packets received */
436 uint64_t tcps_rcvpack; /* packets received in sequence */
437 uint64_t tcps_rcvbyte; /* bytes received in sequence */
438 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */
439 uint64_t tcps_rcvbadoff; /* packets received with bad offset */
440 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */
441 uint64_t tcps_rcvshort; /* packets received too short */
442 uint64_t tcps_rcvduppack; /* duplicate-only packets received */
443 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
444 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */
445 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
446 uint64_t tcps_rcvoopack; /* out-of-order packets received */
447 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */
448 uint64_t tcps_rcvpackafterwin; /* packets with data after window */
449 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
450 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */
451 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */
452 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */
453 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
454 uint64_t tcps_rcvackpack; /* rcvd ack packets */
455 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
456 uint64_t tcps_rcvwinupd; /* rcvd window update packets */
457 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */
458 uint64_t tcps_predack; /* times hdr predict ok for acks */
459 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */
460 uint64_t tcps_pcbcachemiss;
461 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */
462 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */
463 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */
464 uint64_t tcps_usedrtt; /* times RTT initialized from route */
465 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */
466 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/
467 uint64_t tcps_persistdrop; /* timeout in persist state */
468 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */
469 uint64_t tcps_mturesent; /* resends due to MTU discovery */
470 uint64_t tcps_listendrop; /* listen queue overflows */
471 uint64_t tcps_badrst; /* ignored RSTs in the window */
472
473 uint64_t tcps_sc_added; /* entry added to syncache */
474 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
475 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */
476 uint64_t tcps_sc_dropped; /* could not reply to packet */
477 uint64_t tcps_sc_completed; /* successful extraction of entry */
478 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
479 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
480 uint64_t tcps_sc_reset; /* RST removed entry from syncache */
481 uint64_t tcps_sc_stale; /* timed out or listen socket gone */
482 uint64_t tcps_sc_aborted; /* syncache entry aborted */
483 uint64_t tcps_sc_badack; /* removed due to bad ACK */
484 uint64_t tcps_sc_unreach; /* ICMP unreachable received */
485 uint64_t tcps_sc_zonefail; /* zalloc() failed */
486 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */
487 uint64_t tcps_sc_recvcookie; /* SYN cookie received */
488
489 uint64_t tcps_hc_added; /* entry added to hostcache */
490 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
491
492 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
493
494 /* SACK related stats */
495 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
496 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */
497 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
498 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */
499 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */
500 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */
501
502 /* ECN related stats */
503 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */
504 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */
505 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */
506 uint64_t tcps_ecn_shs; /* ECN successful handshakes */
507 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
508
509 /* TCP_SIGNATURE related stats */
510 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */
511 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */
512 uint64_t tcps_sig_err_buildsig; /* Mismatching signature received */
513 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
514 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
515
516 uint64_t _pad[12]; /* 6 UTO, 6 TBD */
517};
518
519#define tcps_rcvmemdrop tcps_rcvreassfull /* compat */
520
521#ifdef _KERNEL
522#include <sys/counter.h>
523
524VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
525/*
526 * In-kernel consumers can use these accessor macros directly to update
527 * stats.
528 */
529#define TCPSTAT_ADD(name, val) \
530 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
531#define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
532
533/*
534 * Kernel module consumers must use this accessor macro.
535 */
536void kmod_tcpstat_inc(int statnum);
537#define KMOD_TCPSTAT_INC(name) \
538 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t))
539
540/*
541 * TCP specific helper hook point identifiers.
542 */
543#define HHOOK_TCP_EST_IN 0
544#define HHOOK_TCP_EST_OUT 1
545#define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
546
547struct tcp_hhook_data {
548 struct tcpcb *tp;
549 struct tcphdr *th;
550 struct tcpopt *to;
551 long len;
552 int tso;
553 tcp_seq curack;
554};
555#endif
556
557/*
558 * TCB structure exported to user-land via sysctl(3).
559 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
560 * included. Not all of our clients do.
561 */
562#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
563struct xtcp_timer {
564 int tt_rexmt; /* retransmit timer */
565 int tt_persist; /* retransmit persistence */
566 int tt_keep; /* keepalive */
567 int tt_2msl; /* 2*msl TIME_WAIT timer */
568 int tt_delack; /* delayed ACK timer */
569 int t_rcvtime; /* Time since last packet received */
570};
571struct xtcpcb {
572 size_t xt_len;
573 struct inpcb xt_inp;
574 struct tcpcb xt_tp;
575 struct xsocket xt_socket;
576 struct xtcp_timer xt_timer;
577 u_quad_t xt_alignment_hack;
578};
579#endif
580
581/*
582 * Identifiers for TCP sysctl nodes
583 */
584#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
585#define TCPCTL_MSSDFLT 3 /* MSS default */
586#define TCPCTL_STATS 4 /* statistics (read-only) */
587#define TCPCTL_RTTDFLT 5 /* default RTT estimate */
588#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
589#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
590#define TCPCTL_SENDSPACE 8 /* send buffer space */
591#define TCPCTL_RECVSPACE 9 /* receive buffer space */
592#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
593#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
594#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
595#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
596#define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
597#define TCPCTL_DROP 15 /* drop tcp connection */
598
599#ifdef _KERNEL
600#ifdef SYSCTL_DECL
601SYSCTL_DECL(_net_inet_tcp);
602SYSCTL_DECL(_net_inet_tcp_sack);
603MALLOC_DECLARE(M_TCPLOG);
604#endif
605
606VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */
607VNET_DECLARE(struct inpcbinfo, tcbinfo);
608extern int tcp_log_in_vain;
609VNET_DECLARE(int, tcp_mssdflt); /* XXX */
610VNET_DECLARE(int, tcp_minmss);
611VNET_DECLARE(int, tcp_delack_enabled);
612VNET_DECLARE(int, tcp_do_rfc3390);
613VNET_DECLARE(int, tcp_do_initcwnd10);
614VNET_DECLARE(int, tcp_sendspace);
615VNET_DECLARE(int, tcp_recvspace);
616VNET_DECLARE(int, path_mtu_discovery);
617VNET_DECLARE(int, tcp_do_rfc3465);
618VNET_DECLARE(int, tcp_abc_l_var);
619#define V_tcb VNET(tcb)
620#define V_tcbinfo VNET(tcbinfo)
621#define V_tcp_mssdflt VNET(tcp_mssdflt)
622#define V_tcp_minmss VNET(tcp_minmss)
623#define V_tcp_delack_enabled VNET(tcp_delack_enabled)
624#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
625#define V_tcp_do_initcwnd10 VNET(tcp_do_initcwnd10)
626#define V_tcp_sendspace VNET(tcp_sendspace)
627#define V_tcp_recvspace VNET(tcp_recvspace)
628#define V_path_mtu_discovery VNET(path_mtu_discovery)
629#define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
630#define V_tcp_abc_l_var VNET(tcp_abc_l_var)
631
632VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */
633VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */
634#define V_tcp_do_sack VNET(tcp_do_sack)
635#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
636
637VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */
638VNET_DECLARE(int, tcp_ecn_maxretries);
639#define V_tcp_do_ecn VNET(tcp_do_ecn)
640#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
641
642VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
643#define V_tcp_hhh VNET(tcp_hhh)
644
645int tcp_addoptions(struct tcpopt *, u_char *);
646int tcp_ccalgounload(struct cc_algo *unload_algo);
647struct tcpcb *
648 tcp_close(struct tcpcb *);
649void tcp_discardcb(struct tcpcb *);
650void tcp_twstart(struct tcpcb *);
651void tcp_twclose(struct tcptw *, int);
652void tcp_ctlinput(int, struct sockaddr *, void *);
653int tcp_ctloutput(struct socket *, struct sockopt *);
654struct tcpcb *
655 tcp_drop(struct tcpcb *, int);
656void tcp_drain(void);
657void tcp_init(void);
658#ifdef VIMAGE
659void tcp_destroy(void);
660#endif
661void tcp_fini(void *);
662char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
663 const void *);
664char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
665 const void *);
666int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
667void tcp_reass_global_init(void);
668void tcp_reass_flush(struct tcpcb *);
669int tcp_input(struct mbuf **, int *, int);
670u_long tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
671u_long tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
672void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
673 struct tcp_ifcap *);
674void tcp_mss(struct tcpcb *, int);
675int tcp_mssopt(struct in_conninfo *);
676struct inpcb *
677 tcp_drop_syn_sent(struct inpcb *, int);
678struct tcpcb *
679 tcp_newtcpcb(struct inpcb *);
680int tcp_output(struct tcpcb *);
681void tcp_state_change(struct tcpcb *, int);
682void tcp_respond(struct tcpcb *, void *,
683 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
684void tcp_tw_init(void);
685#ifdef VIMAGE
686void tcp_tw_destroy(void);
687#endif
688void tcp_tw_zone_change(void);
689int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
690 struct mbuf *, int);
691void tcp_setpersist(struct tcpcb *);
692#ifdef TCP_SIGNATURE
693struct secasvar;
694struct secasvar *tcp_get_sav(struct mbuf *, u_int);
695int tcp_signature_do_compute(struct mbuf *, int, int, u_char *,
696 struct secasvar *);
697int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
698int tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *,
699 struct tcphdr *, u_int);
700int tcp_signature_check(struct mbuf *m, int off0, int tlen, int optlen,
701 struct tcpopt *to, struct tcphdr *th, u_int tcpbflag);
702#endif
703void tcp_slowtimo(void);
704struct tcptemp *
705 tcpip_maketemplate(struct inpcb *);
706void tcpip_fillheaders(struct inpcb *, void *, void *);
707void tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
708int tcp_timer_active(struct tcpcb *, uint32_t);
709void tcp_timer_stop(struct tcpcb *, uint32_t);
710void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
711/*
712 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
713 */
714void tcp_hc_init(void);
715#ifdef VIMAGE
716void tcp_hc_destroy(void);
717#endif
718void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
719u_long tcp_hc_getmtu(struct in_conninfo *);
720void tcp_hc_updatemtu(struct in_conninfo *, u_long);
721void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
722
723extern struct pr_usrreqs tcp_usrreqs;
724tcp_seq tcp_new_isn(struct tcpcb *);
725
726void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
727void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
728void tcp_clean_sackreport(struct tcpcb *tp);
729void tcp_sack_adjust(struct tcpcb *tp);
730struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
731void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
732void tcp_free_sackholes(struct tcpcb *tp);
733int tcp_newreno(struct tcpcb *, struct tcphdr *);
734u_long tcp_seq_subtract(u_long, u_long );
735
736void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
737
738static inline void
739tcp_fields_to_host(struct tcphdr *th)
740{
741
742 th->th_seq = ntohl(th->th_seq);
743 th->th_ack = ntohl(th->th_ack);
744 th->th_win = ntohs(th->th_win);
745 th->th_urp = ntohs(th->th_urp);
746}
747
748#ifdef TCP_SIGNATURE
749static inline void
750tcp_fields_to_net(struct tcphdr *th)
751{
752
753 th->th_seq = htonl(th->th_seq);
754 th->th_ack = htonl(th->th_ack);
755 th->th_win = htons(th->th_win);
756 th->th_urp = htons(th->th_urp);
757}
758#endif
759#endif /* _KERNEL */
760
761#endif /* _NETINET_TCP_VAR_H_ */