tcp_var.h revision 285980
1/*-
2 * Copyright (c) 1982, 1986, 1993, 1994, 1995
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	@(#)tcp_var.h	8.4 (Berkeley) 5/24/95
30 * $FreeBSD: releng/9.3/sys/netinet/tcp_var.h 285980 2015-07-28 19:59:22Z delphij $
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/* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */
87#ifdef INET6
88#define ND6_HINT(tp)						\
89do {								\
90	if ((tp) && (tp)->t_inpcb &&				\
91	    ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0)		\
92		nd6_nud_hint(NULL, NULL, 0);			\
93} while (0)
94#else
95#define ND6_HINT(tp)
96#endif
97
98/*
99 * Tcp control block, one per tcp; fields:
100 * Organized for 16 byte cacheline efficiency.
101 */
102struct tcpcb {
103	struct	tsegqe_head t_segq;	/* segment reassembly queue */
104	void	*t_pspare[2];		/* new reassembly queue */
105	int	t_segqlen;		/* segment reassembly queue length */
106	int	t_dupacks;		/* consecutive dup acks recd */
107
108	struct tcp_timer *t_timers;	/* All the TCP timers in one struct */
109
110	struct	inpcb *t_inpcb;		/* back pointer to internet pcb */
111	int	t_state;		/* state of this connection */
112	u_int	t_flags;
113
114	struct	vnet *t_vnet;		/* back pointer to parent vnet */
115
116	tcp_seq	snd_una;		/* send unacknowledged */
117	tcp_seq	snd_max;		/* highest sequence number sent;
118					 * used to recognize retransmits
119					 */
120	tcp_seq	snd_nxt;		/* send next */
121	tcp_seq	snd_up;			/* send urgent pointer */
122
123	tcp_seq	snd_wl1;		/* window update seg seq number */
124	tcp_seq	snd_wl2;		/* window update seg ack number */
125	tcp_seq	iss;			/* initial send sequence number */
126	tcp_seq	irs;			/* initial receive sequence number */
127
128	tcp_seq	rcv_nxt;		/* receive next */
129	tcp_seq	rcv_adv;		/* advertised window */
130	u_long	rcv_wnd;		/* receive window */
131	tcp_seq	rcv_up;			/* receive urgent pointer */
132
133	u_long	snd_wnd;		/* send window */
134	u_long	snd_cwnd;		/* congestion-controlled window */
135	u_long	snd_spare1;		/* unused */
136	u_long	snd_ssthresh;		/* snd_cwnd size threshold for
137					 * for slow start exponential to
138					 * linear switch
139					 */
140	u_long	snd_spare2;		/* unused */
141	tcp_seq	snd_recover;		/* for use in NewReno Fast Recovery */
142
143	u_int	t_maxopd;		/* mss plus options */
144
145	u_int	t_rcvtime;		/* inactivity time */
146	u_int	t_starttime;		/* time connection was established */
147	u_int	t_rtttime;		/* RTT measurement start time */
148	tcp_seq	t_rtseq;		/* sequence number being timed */
149
150	u_int	t_bw_spare1;		/* unused */
151	tcp_seq	t_bw_spare2;		/* unused */
152
153	int	t_rxtcur;		/* current retransmit value (ticks) */
154	u_int	t_maxseg;		/* maximum segment size */
155	int	t_srtt;			/* smoothed round-trip time */
156	int	t_rttvar;		/* variance in round-trip time */
157
158	int	t_rxtshift;		/* log(2) of rexmt exp. backoff */
159	u_int	t_rttmin;		/* minimum rtt allowed */
160	u_int	t_rttbest;		/* best rtt we've seen */
161	u_long	t_rttupdated;		/* number of times rtt sampled */
162	u_long	max_sndwnd;		/* largest window peer has offered */
163
164	int	t_softerror;		/* possible error not yet reported */
165/* out-of-band data */
166	char	t_oobflags;		/* have some */
167	char	t_iobc;			/* input character */
168/* RFC 1323 variables */
169	u_char	snd_scale;		/* window scaling for send window */
170	u_char	rcv_scale;		/* window scaling for recv window */
171	u_char	request_r_scale;	/* pending window scaling */
172	u_int32_t  ts_recent;		/* timestamp echo data */
173	u_int	ts_recent_age;		/* when last updated */
174	u_int32_t  ts_offset;		/* our timestamp offset */
175
176	tcp_seq	last_ack_sent;
177/* experimental */
178	u_long	snd_cwnd_prev;		/* cwnd prior to retransmit */
179	u_long	snd_ssthresh_prev;	/* ssthresh prior to retransmit */
180	tcp_seq	snd_recover_prev;	/* snd_recover prior to retransmit */
181	int	t_sndzerowin;		/* zero-window updates sent */
182	u_int	t_badrxtwin;		/* window for retransmit recovery */
183	u_char	snd_limited;		/* segments limited transmitted */
184/* SACK related state */
185	int	snd_numholes;		/* number of holes seen by sender */
186	TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
187					/* SACK scoreboard (sorted) */
188	tcp_seq	snd_fack;		/* last seq number(+1) sack'd by rcv'r*/
189	int	rcv_numsacks;		/* # distinct sack blks present */
190	struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
191	tcp_seq sack_newdata;		/* New data xmitted in this recovery
192					   episode starts at this seq number */
193	struct sackhint	sackhint;	/* SACK scoreboard hint */
194	int	t_rttlow;		/* smallest observerved RTT */
195	u_int32_t	rfbuf_ts;	/* recv buffer autoscaling timestamp */
196	int	rfbuf_cnt;		/* recv buffer autoscaling byte count */
197	struct toedev	*tod;		/* toedev handling this connection */
198	int	t_sndrexmitpack;	/* retransmit packets sent */
199	int	t_rcvoopack;		/* out-of-order packets received */
200	void	*t_toe;			/* TOE pcb pointer */
201	int	t_bytes_acked;		/* # bytes acked during current RTT */
202	struct cc_algo	*cc_algo;	/* congestion control algorithm */
203	struct cc_var	*ccv;		/* congestion control specific vars */
204	struct osd	*osd;		/* storage for Khelp module data */
205
206	u_int	t_keepinit;		/* time to establish connection */
207	u_int	t_keepidle;		/* time before keepalive probes begin */
208	u_int	t_keepintvl;		/* interval between keepalives */
209	u_int	t_keepcnt;		/* number of keepalives before close */
210
211	u_int	t_tsomax;		/* tso burst length limit */
212
213	uint32_t t_ispare[7];		/* 5 UTO, 2 TBD */
214	void	*t_pspare2[4];		/* 4 TBD */
215	uint64_t _pad[6];		/* 6 TBD (1-2 CC/RTT?) */
216};
217
218/*
219 * Flags and utility macros for the t_flags field.
220 */
221#define	TF_ACKNOW	0x000001	/* ack peer immediately */
222#define	TF_DELACK	0x000002	/* ack, but try to delay it */
223#define	TF_NODELAY	0x000004	/* don't delay packets to coalesce */
224#define	TF_NOOPT	0x000008	/* don't use tcp options */
225#define	TF_SENTFIN	0x000010	/* have sent FIN */
226#define	TF_REQ_SCALE	0x000020	/* have/will request window scaling */
227#define	TF_RCVD_SCALE	0x000040	/* other side has requested scaling */
228#define	TF_REQ_TSTMP	0x000080	/* have/will request timestamps */
229#define	TF_RCVD_TSTMP	0x000100	/* a timestamp was received in SYN */
230#define	TF_SACK_PERMIT	0x000200	/* other side said I could SACK */
231#define	TF_NEEDSYN	0x000400	/* send SYN (implicit state) */
232#define	TF_NEEDFIN	0x000800	/* send FIN (implicit state) */
233#define	TF_NOPUSH	0x001000	/* don't push */
234#define	TF_PREVVALID	0x002000	/* saved values for bad rxmit valid */
235#define	TF_MORETOCOME	0x010000	/* More data to be appended to sock */
236#define	TF_LQ_OVERFLOW	0x020000	/* listen queue overflow */
237#define	TF_LASTIDLE	0x040000	/* connection was previously idle */
238#define	TF_RXWIN0SENT	0x080000	/* sent a receiver win 0 in response */
239#define	TF_FASTRECOVERY	0x100000	/* in NewReno Fast Recovery */
240#define	TF_WASFRECOVERY	0x200000	/* was in NewReno Fast Recovery */
241#define	TF_SIGNATURE	0x400000	/* require MD5 digests (RFC2385) */
242#define	TF_FORCEDATA	0x800000	/* force out a byte */
243#define	TF_TSO		0x1000000	/* TSO enabled on this connection */
244#define	TF_TOE		0x2000000	/* this connection is offloaded */
245#define	TF_ECN_PERMIT	0x4000000	/* connection ECN-ready */
246#define	TF_ECN_SND_CWR	0x8000000	/* ECN CWR in queue */
247#define	TF_ECN_SND_ECE	0x10000000	/* ECN ECE in queue */
248#define	TF_CONGRECOVERY	0x20000000	/* congestion recovery mode */
249#define	TF_WASCRECOVERY	0x40000000	/* was in congestion recovery */
250
251#define	IN_FASTRECOVERY(t_flags)	(t_flags & TF_FASTRECOVERY)
252#define	ENTER_FASTRECOVERY(t_flags)	t_flags |= TF_FASTRECOVERY
253#define	EXIT_FASTRECOVERY(t_flags)	t_flags &= ~TF_FASTRECOVERY
254
255#define	IN_CONGRECOVERY(t_flags)	(t_flags & TF_CONGRECOVERY)
256#define	ENTER_CONGRECOVERY(t_flags)	t_flags |= TF_CONGRECOVERY
257#define	EXIT_CONGRECOVERY(t_flags)	t_flags &= ~TF_CONGRECOVERY
258
259#define	IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
260#define	ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
261#define	EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
262
263#define	BYTES_THIS_ACK(tp, th)	(th->th_ack - tp->snd_una)
264
265/*
266 * Flags for the t_oobflags field.
267 */
268#define	TCPOOB_HAVEDATA	0x01
269#define	TCPOOB_HADDATA	0x02
270
271#ifdef TCP_SIGNATURE
272/*
273 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
274 * for SADB verification and lookup.
275 */
276#define	TCP_SIGLEN	16	/* length of computed digest in bytes */
277#define	TCP_KEYLEN_MIN	1	/* minimum length of TCP-MD5 key */
278#define	TCP_KEYLEN_MAX	80	/* maximum length of TCP-MD5 key */
279/*
280 * Only a single SA per host may be specified at this time. An SPI is
281 * needed in order for the KEY_ALLOCSA() lookup to work.
282 */
283#define	TCP_SIG_SPI	0x1000
284#endif /* TCP_SIGNATURE */
285
286/*
287 * Structure to hold TCP options that are only used during segment
288 * processing (in tcp_input), but not held in the tcpcb.
289 * It's basically used to reduce the number of parameters
290 * to tcp_dooptions and tcp_addoptions.
291 * The binary order of the to_flags is relevant for packing of the
292 * options in tcp_addoptions.
293 */
294struct tcpopt {
295	u_int64_t	to_flags;	/* which options are present */
296#define	TOF_MSS		0x0001		/* maximum segment size */
297#define	TOF_SCALE	0x0002		/* window scaling */
298#define	TOF_SACKPERM	0x0004		/* SACK permitted */
299#define	TOF_TS		0x0010		/* timestamp */
300#define	TOF_SIGNATURE	0x0040		/* TCP-MD5 signature option (RFC2385) */
301#define	TOF_SACK	0x0080		/* Peer sent SACK option */
302#define	TOF_MAXOPT	0x0100
303	u_int32_t	to_tsval;	/* new timestamp */
304	u_int32_t	to_tsecr;	/* reflected timestamp */
305	u_char		*to_sacks;	/* pointer to the first SACK blocks */
306	u_char		*to_signature;	/* pointer to the TCP-MD5 signature */
307	u_int16_t	to_mss;		/* maximum segment size */
308	u_int8_t	to_wscale;	/* window scaling */
309	u_int8_t	to_nsacks;	/* number of SACK blocks */
310	u_int32_t	to_spare;	/* UTO */
311};
312
313/*
314 * Flags for tcp_dooptions.
315 */
316#define	TO_SYN		0x01		/* parse SYN-only options */
317
318struct hc_metrics_lite {	/* must stay in sync with hc_metrics */
319	u_long	rmx_mtu;	/* MTU for this path */
320	u_long	rmx_ssthresh;	/* outbound gateway buffer limit */
321	u_long	rmx_rtt;	/* estimated round trip time */
322	u_long	rmx_rttvar;	/* estimated rtt variance */
323	u_long	rmx_bandwidth;	/* estimated bandwidth */
324	u_long	rmx_cwnd;	/* congestion window */
325	u_long	rmx_sendpipe;   /* outbound delay-bandwidth product */
326	u_long	rmx_recvpipe;   /* inbound delay-bandwidth product */
327};
328
329/*
330 * Used by tcp_maxmtu() to communicate interface specific features
331 * and limits at the time of connection setup.
332 */
333struct tcp_ifcap {
334	int	ifcap;
335	u_int	tsomax;
336};
337
338#ifndef _NETINET_IN_PCB_H_
339struct in_conninfo;
340#endif /* _NETINET_IN_PCB_H_ */
341
342struct tcptw {
343	struct inpcb	*tw_inpcb;	/* XXX back pointer to internet pcb */
344	tcp_seq		snd_nxt;
345	tcp_seq		rcv_nxt;
346	tcp_seq		iss;
347	tcp_seq		irs;
348	u_short		last_win;	/* cached window value */
349	u_short		tw_so_options;	/* copy of so_options */
350	struct ucred	*tw_cred;	/* user credentials */
351	u_int32_t	t_recent;
352	u_int32_t	ts_offset;	/* our timestamp offset */
353	u_int		t_starttime;
354	int		tw_time;
355	TAILQ_ENTRY(tcptw) tw_2msl;
356};
357
358#define	intotcpcb(ip)	((struct tcpcb *)(ip)->inp_ppcb)
359#define	intotw(ip)	((struct tcptw *)(ip)->inp_ppcb)
360#define	sototcpcb(so)	(intotcpcb(sotoinpcb(so)))
361
362/*
363 * The smoothed round-trip time and estimated variance
364 * are stored as fixed point numbers scaled by the values below.
365 * For convenience, these scales are also used in smoothing the average
366 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
367 * With these scales, srtt has 3 bits to the right of the binary point,
368 * and thus an "ALPHA" of 0.875.  rttvar has 2 bits to the right of the
369 * binary point, and is smoothed with an ALPHA of 0.75.
370 */
371#define	TCP_RTT_SCALE		32	/* multiplier for srtt; 3 bits frac. */
372#define	TCP_RTT_SHIFT		5	/* shift for srtt; 3 bits frac. */
373#define	TCP_RTTVAR_SCALE	16	/* multiplier for rttvar; 2 bits */
374#define	TCP_RTTVAR_SHIFT	4	/* shift for rttvar; 2 bits */
375#define	TCP_DELTA_SHIFT		2	/* see tcp_input.c */
376
377/*
378 * The initial retransmission should happen at rtt + 4 * rttvar.
379 * Because of the way we do the smoothing, srtt and rttvar
380 * will each average +1/2 tick of bias.  When we compute
381 * the retransmit timer, we want 1/2 tick of rounding and
382 * 1 extra tick because of +-1/2 tick uncertainty in the
383 * firing of the timer.  The bias will give us exactly the
384 * 1.5 tick we need.  But, because the bias is
385 * statistical, we have to test that we don't drop below
386 * the minimum feasible timer (which is 2 ticks).
387 * This version of the macro adapted from a paper by Lawrence
388 * Brakmo and Larry Peterson which outlines a problem caused
389 * by insufficient precision in the original implementation,
390 * which results in inappropriately large RTO values for very
391 * fast networks.
392 */
393#define	TCP_REXMTVAL(tp) \
394	max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT))  \
395	  + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
396
397/*
398 * TCP statistics.
399 * Many of these should be kept per connection,
400 * but that's inconvenient at the moment.
401 */
402struct	tcpstat {
403	u_long	tcps_connattempt;	/* connections initiated */
404	u_long	tcps_accepts;		/* connections accepted */
405	u_long	tcps_connects;		/* connections established */
406	u_long	tcps_drops;		/* connections dropped */
407	u_long	tcps_conndrops;		/* embryonic connections dropped */
408	u_long	tcps_minmssdrops;	/* average minmss too low drops */
409	u_long	tcps_closed;		/* conn. closed (includes drops) */
410	u_long	tcps_segstimed;		/* segs where we tried to get rtt */
411	u_long	tcps_rttupdated;	/* times we succeeded */
412	u_long	tcps_delack;		/* delayed acks sent */
413	u_long	tcps_timeoutdrop;	/* conn. dropped in rxmt timeout */
414	u_long	tcps_rexmttimeo;	/* retransmit timeouts */
415	u_long	tcps_persisttimeo;	/* persist timeouts */
416	u_long	tcps_keeptimeo;		/* keepalive timeouts */
417	u_long	tcps_keepprobe;		/* keepalive probes sent */
418	u_long	tcps_keepdrops;		/* connections dropped in keepalive */
419
420	u_long	tcps_sndtotal;		/* total packets sent */
421	u_long	tcps_sndpack;		/* data packets sent */
422	u_long	tcps_sndbyte;		/* data bytes sent */
423	u_long	tcps_sndrexmitpack;	/* data packets retransmitted */
424	u_long	tcps_sndrexmitbyte;	/* data bytes retransmitted */
425	u_long	tcps_sndrexmitbad;	/* unnecessary packet retransmissions */
426	u_long	tcps_sndacks;		/* ack-only packets sent */
427	u_long	tcps_sndprobe;		/* window probes sent */
428	u_long	tcps_sndurg;		/* packets sent with URG only */
429	u_long	tcps_sndwinup;		/* window update-only packets sent */
430	u_long	tcps_sndctrl;		/* control (SYN|FIN|RST) packets sent */
431
432	u_long	tcps_rcvtotal;		/* total packets received */
433	u_long	tcps_rcvpack;		/* packets received in sequence */
434	u_long	tcps_rcvbyte;		/* bytes received in sequence */
435	u_long	tcps_rcvbadsum;		/* packets received with ccksum errs */
436	u_long	tcps_rcvbadoff;		/* packets received with bad offset */
437	u_long	tcps_rcvmemdrop;	/* packets dropped for lack of memory */
438	u_long	tcps_rcvshort;		/* packets received too short */
439	u_long	tcps_rcvduppack;	/* duplicate-only packets received */
440	u_long	tcps_rcvdupbyte;	/* duplicate-only bytes received */
441	u_long	tcps_rcvpartduppack;	/* packets with some duplicate data */
442	u_long	tcps_rcvpartdupbyte;	/* dup. bytes in part-dup. packets */
443	u_long	tcps_rcvoopack;		/* out-of-order packets received */
444	u_long	tcps_rcvoobyte;		/* out-of-order bytes received */
445	u_long	tcps_rcvpackafterwin;	/* packets with data after window */
446	u_long	tcps_rcvbyteafterwin;	/* bytes rcvd after window */
447	u_long	tcps_rcvafterclose;	/* packets rcvd after "close" */
448	u_long	tcps_rcvwinprobe;	/* rcvd window probe packets */
449	u_long	tcps_rcvdupack;		/* rcvd duplicate acks */
450	u_long	tcps_rcvacktoomuch;	/* rcvd acks for unsent data */
451	u_long	tcps_rcvackpack;	/* rcvd ack packets */
452	u_long	tcps_rcvackbyte;	/* bytes acked by rcvd acks */
453	u_long	tcps_rcvwinupd;		/* rcvd window update packets */
454	u_long	tcps_pawsdrop;		/* segments dropped due to PAWS */
455	u_long	tcps_predack;		/* times hdr predict ok for acks */
456	u_long	tcps_preddat;		/* times hdr predict ok for data pkts */
457	u_long	tcps_pcbcachemiss;
458	u_long	tcps_cachedrtt;		/* times cached RTT in route updated */
459	u_long	tcps_cachedrttvar;	/* times cached rttvar updated */
460	u_long	tcps_cachedssthresh;	/* times cached ssthresh updated */
461	u_long	tcps_usedrtt;		/* times RTT initialized from route */
462	u_long	tcps_usedrttvar;	/* times RTTVAR initialized from rt */
463	u_long	tcps_usedssthresh;	/* times ssthresh initialized from rt*/
464	u_long	tcps_persistdrop;	/* timeout in persist state */
465	u_long	tcps_badsyn;		/* bogus SYN, e.g. premature ACK */
466	u_long	tcps_mturesent;		/* resends due to MTU discovery */
467	u_long	tcps_listendrop;	/* listen queue overflows */
468	u_long	tcps_badrst;		/* ignored RSTs in the window */
469
470	u_long	tcps_sc_added;		/* entry added to syncache */
471	u_long	tcps_sc_retransmitted;	/* syncache entry was retransmitted */
472	u_long	tcps_sc_dupsyn;		/* duplicate SYN packet */
473	u_long	tcps_sc_dropped;	/* could not reply to packet */
474	u_long	tcps_sc_completed;	/* successful extraction of entry */
475	u_long	tcps_sc_bucketoverflow;	/* syncache per-bucket limit hit */
476	u_long	tcps_sc_cacheoverflow;	/* syncache cache limit hit */
477	u_long	tcps_sc_reset;		/* RST removed entry from syncache */
478	u_long	tcps_sc_stale;		/* timed out or listen socket gone */
479	u_long	tcps_sc_aborted;	/* syncache entry aborted */
480	u_long	tcps_sc_badack;		/* removed due to bad ACK */
481	u_long	tcps_sc_unreach;	/* ICMP unreachable received */
482	u_long	tcps_sc_zonefail;	/* zalloc() failed */
483	u_long	tcps_sc_sendcookie;	/* SYN cookie sent */
484	u_long	tcps_sc_recvcookie;	/* SYN cookie received */
485
486	u_long	tcps_hc_added;		/* entry added to hostcache */
487	u_long	tcps_hc_bucketoverflow;	/* hostcache per bucket limit hit */
488
489	u_long  tcps_finwait2_drops;    /* Drop FIN_WAIT_2 connection after time limit */
490
491	/* SACK related stats */
492	u_long	tcps_sack_recovery_episode; /* SACK recovery episodes */
493	u_long  tcps_sack_rexmits;	    /* SACK rexmit segments   */
494	u_long  tcps_sack_rexmit_bytes;	    /* SACK rexmit bytes      */
495	u_long  tcps_sack_rcv_blocks;	    /* SACK blocks (options) received */
496	u_long  tcps_sack_send_blocks;	    /* SACK blocks (options) sent     */
497	u_long  tcps_sack_sboverflow;	    /* times scoreboard overflowed */
498
499	/* ECN related stats */
500	u_long	tcps_ecn_ce;		/* ECN Congestion Experienced */
501	u_long	tcps_ecn_ect0;		/* ECN Capable Transport */
502	u_long	tcps_ecn_ect1;		/* ECN Capable Transport */
503	u_long	tcps_ecn_shs;		/* ECN successful handshakes */
504	u_long	tcps_ecn_rcwnd;		/* # times ECN reduced the cwnd */
505
506	/* TCP_SIGNATURE related stats */
507	u_long	tcps_sig_rcvgoodsig;	/* Total matching signature received */
508	u_long	tcps_sig_rcvbadsig;	/* Total bad signature received */
509	u_long	tcps_sig_err_buildsig;	/* Mismatching signature received */
510	u_long	tcps_sig_err_sigopt;	/* No signature expected by socket */
511	u_long	tcps_sig_err_nosigopt;	/* No signature provided by segment */
512
513	u_long	_pad[12];		/* 6 UTO, 6 TBD */
514};
515
516#ifdef _KERNEL
517/*
518 * In-kernel consumers can use these accessor macros directly to update
519 * stats.
520 */
521#define	TCPSTAT_ADD(name, val)	V_tcpstat.name += (val)
522#define	TCPSTAT_INC(name)	TCPSTAT_ADD(name, 1)
523
524/*
525 * Kernel module consumers must use this accessor macro.
526 */
527void	kmod_tcpstat_inc(int statnum);
528#define	KMOD_TCPSTAT_INC(name)						\
529	kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long))
530
531/*
532 * TCP specific helper hook point identifiers.
533 */
534#define	HHOOK_TCP_EST_IN		0
535#define	HHOOK_TCP_EST_OUT		1
536#define	HHOOK_TCP_LAST			HHOOK_TCP_EST_OUT
537
538struct tcp_hhook_data {
539	struct tcpcb	*tp;
540	struct tcphdr	*th;
541	struct tcpopt	*to;
542	long		len;
543	int		tso;
544	tcp_seq		curack;
545};
546#endif
547
548/*
549 * TCB structure exported to user-land via sysctl(3).
550 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
551 * included.  Not all of our clients do.
552 */
553#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
554struct xtcp_timer {
555	int tt_rexmt;	/* retransmit timer */
556	int tt_persist;	/* retransmit persistence */
557	int tt_keep;	/* keepalive */
558	int tt_2msl;	/* 2*msl TIME_WAIT timer */
559	int tt_delack;	/* delayed ACK timer */
560	int t_rcvtime;	/* Time since last packet received */
561};
562struct	xtcpcb {
563	size_t	xt_len;
564	struct	inpcb	xt_inp;
565	struct	tcpcb	xt_tp;
566	struct	xsocket	xt_socket;
567	struct	xtcp_timer xt_timer;
568	u_quad_t	xt_alignment_hack;
569};
570#endif
571
572/*
573 * Names for TCP sysctl objects
574 */
575#define	TCPCTL_DO_RFC1323	1	/* use RFC-1323 extensions */
576#define	TCPCTL_MSSDFLT		3	/* MSS default */
577#define TCPCTL_STATS		4	/* statistics (read-only) */
578#define	TCPCTL_RTTDFLT		5	/* default RTT estimate */
579#define	TCPCTL_KEEPIDLE		6	/* keepalive idle timer */
580#define	TCPCTL_KEEPINTVL	7	/* interval to send keepalives */
581#define	TCPCTL_SENDSPACE	8	/* send buffer space */
582#define	TCPCTL_RECVSPACE	9	/* receive buffer space */
583#define	TCPCTL_KEEPINIT		10	/* timeout for establishing syn */
584#define	TCPCTL_PCBLIST		11	/* list of all outstanding PCBs */
585#define	TCPCTL_DELACKTIME	12	/* time before sending delayed ACK */
586#define	TCPCTL_V6MSSDFLT	13	/* MSS default for IPv6 */
587#define	TCPCTL_SACK		14	/* Selective Acknowledgement,rfc 2018 */
588#define	TCPCTL_DROP		15	/* drop tcp connection */
589#define	TCPCTL_MAXID		16
590#define TCPCTL_FINWAIT2_TIMEOUT        17
591
592#define TCPCTL_NAMES { \
593	{ 0, 0 }, \
594	{ "rfc1323", CTLTYPE_INT }, \
595	{ "mssdflt", CTLTYPE_INT }, \
596	{ "stats", CTLTYPE_STRUCT }, \
597	{ "rttdflt", CTLTYPE_INT }, \
598	{ "keepidle", CTLTYPE_INT }, \
599	{ "keepintvl", CTLTYPE_INT }, \
600	{ "sendspace", CTLTYPE_INT }, \
601	{ "recvspace", CTLTYPE_INT }, \
602	{ "keepinit", CTLTYPE_INT }, \
603	{ "pcblist", CTLTYPE_STRUCT }, \
604	{ "delacktime", CTLTYPE_INT }, \
605	{ "v6mssdflt", CTLTYPE_INT }, \
606	{ "maxid", CTLTYPE_INT }, \
607}
608
609
610#ifdef _KERNEL
611#ifdef SYSCTL_DECL
612SYSCTL_DECL(_net_inet_tcp);
613SYSCTL_DECL(_net_inet_tcp_sack);
614MALLOC_DECLARE(M_TCPLOG);
615#endif
616
617VNET_DECLARE(struct inpcbhead, tcb);		/* queue of active tcpcb's */
618VNET_DECLARE(struct inpcbinfo, tcbinfo);
619VNET_DECLARE(struct tcpstat, tcpstat);		/* tcp statistics */
620extern	int tcp_log_in_vain;
621VNET_DECLARE(int, tcp_mssdflt);	/* XXX */
622VNET_DECLARE(int, tcp_minmss);
623VNET_DECLARE(int, tcp_delack_enabled);
624VNET_DECLARE(int, tcp_do_rfc3390);
625VNET_DECLARE(int, tcp_do_initcwnd10);
626VNET_DECLARE(int, tcp_sendspace);
627VNET_DECLARE(int, tcp_recvspace);
628VNET_DECLARE(int, path_mtu_discovery);
629VNET_DECLARE(int, tcp_do_rfc3465);
630VNET_DECLARE(int, tcp_abc_l_var);
631#define	V_tcb			VNET(tcb)
632#define	V_tcbinfo		VNET(tcbinfo)
633#define	V_tcpstat		VNET(tcpstat)
634#define	V_tcp_mssdflt		VNET(tcp_mssdflt)
635#define	V_tcp_minmss		VNET(tcp_minmss)
636#define	V_tcp_delack_enabled	VNET(tcp_delack_enabled)
637#define	V_tcp_do_rfc3390	VNET(tcp_do_rfc3390)
638#define	V_tcp_do_initcwnd10	VNET(tcp_do_initcwnd10)
639#define	V_tcp_sendspace		VNET(tcp_sendspace)
640#define	V_tcp_recvspace		VNET(tcp_recvspace)
641#define	V_path_mtu_discovery	VNET(path_mtu_discovery)
642#define	V_tcp_do_rfc3465	VNET(tcp_do_rfc3465)
643#define	V_tcp_abc_l_var		VNET(tcp_abc_l_var)
644
645VNET_DECLARE(int, tcp_do_sack);			/* SACK enabled/disabled */
646VNET_DECLARE(int, tcp_sc_rst_sock_fail);	/* RST on sock alloc failure */
647#define	V_tcp_do_sack		VNET(tcp_do_sack)
648#define	V_tcp_sc_rst_sock_fail	VNET(tcp_sc_rst_sock_fail)
649
650VNET_DECLARE(int, tcp_do_ecn);			/* TCP ECN enabled/disabled */
651VNET_DECLARE(int, tcp_ecn_maxretries);
652#define	V_tcp_do_ecn		VNET(tcp_do_ecn)
653#define	V_tcp_ecn_maxretries	VNET(tcp_ecn_maxretries)
654
655VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
656#define	V_tcp_hhh		VNET(tcp_hhh)
657
658int	 tcp_addoptions(struct tcpopt *, u_char *);
659int	 tcp_ccalgounload(struct cc_algo *unload_algo);
660struct tcpcb *
661	 tcp_close(struct tcpcb *);
662void	 tcp_discardcb(struct tcpcb *);
663void	 tcp_twstart(struct tcpcb *);
664#if 0
665int	 tcp_twrecycleable(struct tcptw *tw);
666#endif
667void	 tcp_twclose(struct tcptw *_tw, int _reuse);
668void	 tcp_ctlinput(int, struct sockaddr *, void *);
669int	 tcp_ctloutput(struct socket *, struct sockopt *);
670struct tcpcb *
671	 tcp_drop(struct tcpcb *, int);
672void	 tcp_drain(void);
673void	 tcp_init(void);
674#ifdef VIMAGE
675void	 tcp_destroy(void);
676#endif
677void	 tcp_fini(void *);
678char	*tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
679	    const void *);
680char	*tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
681	    const void *);
682int	 tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
683void	 tcp_reass_global_init(void);
684void	 tcp_reass_flush(struct tcpcb *);
685void	 tcp_input(struct mbuf *, int);
686u_long	 tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
687u_long	 tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
688void	 tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
689	    struct tcp_ifcap *);
690void	 tcp_mss(struct tcpcb *, int);
691int	 tcp_mssopt(struct in_conninfo *);
692struct inpcb *
693	 tcp_drop_syn_sent(struct inpcb *, int);
694struct inpcb *
695	 tcp_mtudisc(struct inpcb *, int);
696struct tcpcb *
697	 tcp_newtcpcb(struct inpcb *);
698int	 tcp_output(struct tcpcb *);
699void	 tcp_respond(struct tcpcb *, void *,
700	    struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
701void	 tcp_tw_init(void);
702#ifdef VIMAGE
703void	 tcp_tw_destroy(void);
704#endif
705void	 tcp_tw_zone_change(void);
706int	 tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
707	    struct mbuf *, int);
708int	 tcp_twrespond(struct tcptw *, int);
709void	 tcp_setpersist(struct tcpcb *);
710#ifdef TCP_SIGNATURE
711int	 tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
712int	 tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *,
713	    struct tcphdr *, u_int);
714#endif
715void	 tcp_slowtimo(void);
716struct tcptemp *
717	 tcpip_maketemplate(struct inpcb *);
718void	 tcpip_fillheaders(struct inpcb *, void *, void *);
719void	 tcp_timer_activate(struct tcpcb *, int, u_int);
720int	 tcp_timer_active(struct tcpcb *, int);
721void	 tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
722/*
723 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
724 */
725void	 tcp_hc_init(void);
726#ifdef VIMAGE
727void	 tcp_hc_destroy(void);
728#endif
729void	 tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
730u_long	 tcp_hc_getmtu(struct in_conninfo *);
731void	 tcp_hc_updatemtu(struct in_conninfo *, u_long);
732void	 tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
733
734extern	struct pr_usrreqs tcp_usrreqs;
735tcp_seq tcp_new_isn(struct tcpcb *);
736
737void	 tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
738void	 tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
739void	 tcp_clean_sackreport(struct tcpcb *tp);
740void	 tcp_sack_adjust(struct tcpcb *tp);
741struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
742void	 tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
743void	 tcp_free_sackholes(struct tcpcb *tp);
744int	 tcp_newreno(struct tcpcb *, struct tcphdr *);
745u_long	 tcp_seq_subtract(u_long, u_long );
746
747void	cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
748
749#endif /* _KERNEL */
750
751#endif /* _NETINET_TCP_VAR_H_ */
752