FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_var.h
1 /*-
2 * Copyright (c) 1982, 1986, 1993, 1994, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
30 * $FreeBSD: releng/9.1/sys/netinet/tcp_var.h 235051 2012-05-05 07:55:50Z glebius $
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 */
44 VNET_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 */
50 struct 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 };
56 LIST_HEAD(tsegqe_head, tseg_qent);
57
58 struct sackblk {
59 tcp_seq start; /* start seq no. of sack block */
60 tcp_seq end; /* end seq no. */
61 };
62
63 struct 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
70 struct 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
79 struct 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) \
89 do { \
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 */
102 struct 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 toe_usrreqs *t_tu; /* offload operations vector */
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 uint32_t t_ispare[8]; /* 5 UTO, 3 TBD */
212 void *t_pspare2[4]; /* 4 TBD */
213 uint64_t _pad[6]; /* 6 TBD (1-2 CC/RTT?) */
214 };
215
216 /*
217 * Flags and utility macros for the t_flags field.
218 */
219 #define TF_ACKNOW 0x000001 /* ack peer immediately */
220 #define TF_DELACK 0x000002 /* ack, but try to delay it */
221 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
222 #define TF_NOOPT 0x000008 /* don't use tcp options */
223 #define TF_SENTFIN 0x000010 /* have sent FIN */
224 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
225 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
226 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
227 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
228 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
229 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
230 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
231 #define TF_NOPUSH 0x001000 /* don't push */
232 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */
233 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
234 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
235 #define TF_LASTIDLE 0x040000 /* connection was previously idle */
236 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
237 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
238 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
239 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
240 #define TF_FORCEDATA 0x800000 /* force out a byte */
241 #define TF_TSO 0x1000000 /* TSO enabled on this connection */
242 #define TF_TOE 0x2000000 /* this connection is offloaded */
243 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
244 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
245 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
246 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
247 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
248
249 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
250 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
251 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
252
253 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
254 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
255 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
256
257 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
258 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
259 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
260
261 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
262
263 /*
264 * Flags for the t_oobflags field.
265 */
266 #define TCPOOB_HAVEDATA 0x01
267 #define TCPOOB_HADDATA 0x02
268
269 #ifdef TCP_SIGNATURE
270 /*
271 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
272 * for SADB verification and lookup.
273 */
274 #define TCP_SIGLEN 16 /* length of computed digest in bytes */
275 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
276 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
277 /*
278 * Only a single SA per host may be specified at this time. An SPI is
279 * needed in order for the KEY_ALLOCSA() lookup to work.
280 */
281 #define TCP_SIG_SPI 0x1000
282 #endif /* TCP_SIGNATURE */
283
284 /*
285 * Structure to hold TCP options that are only used during segment
286 * processing (in tcp_input), but not held in the tcpcb.
287 * It's basically used to reduce the number of parameters
288 * to tcp_dooptions and tcp_addoptions.
289 * The binary order of the to_flags is relevant for packing of the
290 * options in tcp_addoptions.
291 */
292 struct tcpopt {
293 u_int64_t to_flags; /* which options are present */
294 #define TOF_MSS 0x0001 /* maximum segment size */
295 #define TOF_SCALE 0x0002 /* window scaling */
296 #define TOF_SACKPERM 0x0004 /* SACK permitted */
297 #define TOF_TS 0x0010 /* timestamp */
298 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
299 #define TOF_SACK 0x0080 /* Peer sent SACK option */
300 #define TOF_MAXOPT 0x0100
301 u_int32_t to_tsval; /* new timestamp */
302 u_int32_t to_tsecr; /* reflected timestamp */
303 u_char *to_sacks; /* pointer to the first SACK blocks */
304 u_char *to_signature; /* pointer to the TCP-MD5 signature */
305 u_int16_t to_mss; /* maximum segment size */
306 u_int8_t to_wscale; /* window scaling */
307 u_int8_t to_nsacks; /* number of SACK blocks */
308 u_int32_t to_spare; /* UTO */
309 };
310
311 /*
312 * Flags for tcp_dooptions.
313 */
314 #define TO_SYN 0x01 /* parse SYN-only options */
315
316 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
317 u_long rmx_mtu; /* MTU for this path */
318 u_long rmx_ssthresh; /* outbound gateway buffer limit */
319 u_long rmx_rtt; /* estimated round trip time */
320 u_long rmx_rttvar; /* estimated rtt variance */
321 u_long rmx_bandwidth; /* estimated bandwidth */
322 u_long rmx_cwnd; /* congestion window */
323 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
324 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
325 };
326
327 #ifndef _NETINET_IN_PCB_H_
328 struct in_conninfo;
329 #endif /* _NETINET_IN_PCB_H_ */
330
331 struct tcptw {
332 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
333 tcp_seq snd_nxt;
334 tcp_seq rcv_nxt;
335 tcp_seq iss;
336 tcp_seq irs;
337 u_short last_win; /* cached window value */
338 u_short tw_so_options; /* copy of so_options */
339 struct ucred *tw_cred; /* user credentials */
340 u_int32_t t_recent;
341 u_int32_t ts_offset; /* our timestamp offset */
342 u_int t_starttime;
343 int tw_time;
344 TAILQ_ENTRY(tcptw) tw_2msl;
345 };
346
347 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
348 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
349 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
350
351 /*
352 * The smoothed round-trip time and estimated variance
353 * are stored as fixed point numbers scaled by the values below.
354 * For convenience, these scales are also used in smoothing the average
355 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
356 * With these scales, srtt has 3 bits to the right of the binary point,
357 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
358 * binary point, and is smoothed with an ALPHA of 0.75.
359 */
360 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
361 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
362 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
363 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
364 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
365
366 /*
367 * The initial retransmission should happen at rtt + 4 * rttvar.
368 * Because of the way we do the smoothing, srtt and rttvar
369 * will each average +1/2 tick of bias. When we compute
370 * the retransmit timer, we want 1/2 tick of rounding and
371 * 1 extra tick because of +-1/2 tick uncertainty in the
372 * firing of the timer. The bias will give us exactly the
373 * 1.5 tick we need. But, because the bias is
374 * statistical, we have to test that we don't drop below
375 * the minimum feasible timer (which is 2 ticks).
376 * This version of the macro adapted from a paper by Lawrence
377 * Brakmo and Larry Peterson which outlines a problem caused
378 * by insufficient precision in the original implementation,
379 * which results in inappropriately large RTO values for very
380 * fast networks.
381 */
382 #define TCP_REXMTVAL(tp) \
383 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
384 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
385
386 /*
387 * TCP statistics.
388 * Many of these should be kept per connection,
389 * but that's inconvenient at the moment.
390 */
391 struct tcpstat {
392 u_long tcps_connattempt; /* connections initiated */
393 u_long tcps_accepts; /* connections accepted */
394 u_long tcps_connects; /* connections established */
395 u_long tcps_drops; /* connections dropped */
396 u_long tcps_conndrops; /* embryonic connections dropped */
397 u_long tcps_minmssdrops; /* average minmss too low drops */
398 u_long tcps_closed; /* conn. closed (includes drops) */
399 u_long tcps_segstimed; /* segs where we tried to get rtt */
400 u_long tcps_rttupdated; /* times we succeeded */
401 u_long tcps_delack; /* delayed acks sent */
402 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
403 u_long tcps_rexmttimeo; /* retransmit timeouts */
404 u_long tcps_persisttimeo; /* persist timeouts */
405 u_long tcps_keeptimeo; /* keepalive timeouts */
406 u_long tcps_keepprobe; /* keepalive probes sent */
407 u_long tcps_keepdrops; /* connections dropped in keepalive */
408
409 u_long tcps_sndtotal; /* total packets sent */
410 u_long tcps_sndpack; /* data packets sent */
411 u_long tcps_sndbyte; /* data bytes sent */
412 u_long tcps_sndrexmitpack; /* data packets retransmitted */
413 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
414 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */
415 u_long tcps_sndacks; /* ack-only packets sent */
416 u_long tcps_sndprobe; /* window probes sent */
417 u_long tcps_sndurg; /* packets sent with URG only */
418 u_long tcps_sndwinup; /* window update-only packets sent */
419 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
420
421 u_long tcps_rcvtotal; /* total packets received */
422 u_long tcps_rcvpack; /* packets received in sequence */
423 u_long tcps_rcvbyte; /* bytes received in sequence */
424 u_long tcps_rcvbadsum; /* packets received with ccksum errs */
425 u_long tcps_rcvbadoff; /* packets received with bad offset */
426 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
427 u_long tcps_rcvshort; /* packets received too short */
428 u_long tcps_rcvduppack; /* duplicate-only packets received */
429 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
430 u_long tcps_rcvpartduppack; /* packets with some duplicate data */
431 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
432 u_long tcps_rcvoopack; /* out-of-order packets received */
433 u_long tcps_rcvoobyte; /* out-of-order bytes received */
434 u_long tcps_rcvpackafterwin; /* packets with data after window */
435 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
436 u_long tcps_rcvafterclose; /* packets rcvd after "close" */
437 u_long tcps_rcvwinprobe; /* rcvd window probe packets */
438 u_long tcps_rcvdupack; /* rcvd duplicate acks */
439 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
440 u_long tcps_rcvackpack; /* rcvd ack packets */
441 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
442 u_long tcps_rcvwinupd; /* rcvd window update packets */
443 u_long tcps_pawsdrop; /* segments dropped due to PAWS */
444 u_long tcps_predack; /* times hdr predict ok for acks */
445 u_long tcps_preddat; /* times hdr predict ok for data pkts */
446 u_long tcps_pcbcachemiss;
447 u_long tcps_cachedrtt; /* times cached RTT in route updated */
448 u_long tcps_cachedrttvar; /* times cached rttvar updated */
449 u_long tcps_cachedssthresh; /* times cached ssthresh updated */
450 u_long tcps_usedrtt; /* times RTT initialized from route */
451 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
452 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
453 u_long tcps_persistdrop; /* timeout in persist state */
454 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
455 u_long tcps_mturesent; /* resends due to MTU discovery */
456 u_long tcps_listendrop; /* listen queue overflows */
457 u_long tcps_badrst; /* ignored RSTs in the window */
458
459 u_long tcps_sc_added; /* entry added to syncache */
460 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
461 u_long tcps_sc_dupsyn; /* duplicate SYN packet */
462 u_long tcps_sc_dropped; /* could not reply to packet */
463 u_long tcps_sc_completed; /* successful extraction of entry */
464 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
465 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
466 u_long tcps_sc_reset; /* RST removed entry from syncache */
467 u_long tcps_sc_stale; /* timed out or listen socket gone */
468 u_long tcps_sc_aborted; /* syncache entry aborted */
469 u_long tcps_sc_badack; /* removed due to bad ACK */
470 u_long tcps_sc_unreach; /* ICMP unreachable received */
471 u_long tcps_sc_zonefail; /* zalloc() failed */
472 u_long tcps_sc_sendcookie; /* SYN cookie sent */
473 u_long tcps_sc_recvcookie; /* SYN cookie received */
474
475 u_long tcps_hc_added; /* entry added to hostcache */
476 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */
477
478 u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
479
480 /* SACK related stats */
481 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */
482 u_long tcps_sack_rexmits; /* SACK rexmit segments */
483 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
484 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */
485 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */
486 u_long tcps_sack_sboverflow; /* times scoreboard overflowed */
487
488 /* ECN related stats */
489 u_long tcps_ecn_ce; /* ECN Congestion Experienced */
490 u_long tcps_ecn_ect0; /* ECN Capable Transport */
491 u_long tcps_ecn_ect1; /* ECN Capable Transport */
492 u_long tcps_ecn_shs; /* ECN successful handshakes */
493 u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
494
495 /* TCP_SIGNATURE related stats */
496 u_long tcps_sig_rcvgoodsig; /* Total matching signature received */
497 u_long tcps_sig_rcvbadsig; /* Total bad signature received */
498 u_long tcps_sig_err_buildsig; /* Mismatching signature received */
499 u_long tcps_sig_err_sigopt; /* No signature expected by socket */
500 u_long tcps_sig_err_nosigopt; /* No signature provided by segment */
501
502 u_long _pad[12]; /* 6 UTO, 6 TBD */
503 };
504
505 #ifdef _KERNEL
506 /*
507 * In-kernel consumers can use these accessor macros directly to update
508 * stats.
509 */
510 #define TCPSTAT_ADD(name, val) V_tcpstat.name += (val)
511 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
512
513 /*
514 * Kernel module consumers must use this accessor macro.
515 */
516 void kmod_tcpstat_inc(int statnum);
517 #define KMOD_TCPSTAT_INC(name) \
518 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long))
519
520 /*
521 * TCP specific helper hook point identifiers.
522 */
523 #define HHOOK_TCP_EST_IN 0
524 #define HHOOK_TCP_EST_OUT 1
525 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
526
527 struct tcp_hhook_data {
528 struct tcpcb *tp;
529 struct tcphdr *th;
530 struct tcpopt *to;
531 long len;
532 int tso;
533 tcp_seq curack;
534 };
535 #endif
536
537 /*
538 * TCB structure exported to user-land via sysctl(3).
539 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
540 * included. Not all of our clients do.
541 */
542 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
543 struct xtcp_timer {
544 int tt_rexmt; /* retransmit timer */
545 int tt_persist; /* retransmit persistence */
546 int tt_keep; /* keepalive */
547 int tt_2msl; /* 2*msl TIME_WAIT timer */
548 int tt_delack; /* delayed ACK timer */
549 int t_rcvtime; /* Time since last packet received */
550 };
551 struct xtcpcb {
552 size_t xt_len;
553 struct inpcb xt_inp;
554 struct tcpcb xt_tp;
555 struct xsocket xt_socket;
556 struct xtcp_timer xt_timer;
557 u_quad_t xt_alignment_hack;
558 };
559 #endif
560
561 /*
562 * Names for TCP sysctl objects
563 */
564 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
565 #define TCPCTL_MSSDFLT 3 /* MSS default */
566 #define TCPCTL_STATS 4 /* statistics (read-only) */
567 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
568 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
569 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
570 #define TCPCTL_SENDSPACE 8 /* send buffer space */
571 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
572 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
573 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
574 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
575 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
576 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
577 #define TCPCTL_DROP 15 /* drop tcp connection */
578 #define TCPCTL_MAXID 16
579 #define TCPCTL_FINWAIT2_TIMEOUT 17
580
581 #define TCPCTL_NAMES { \
582 { 0, 0 }, \
583 { "rfc1323", CTLTYPE_INT }, \
584 { "mssdflt", CTLTYPE_INT }, \
585 { "stats", CTLTYPE_STRUCT }, \
586 { "rttdflt", CTLTYPE_INT }, \
587 { "keepidle", CTLTYPE_INT }, \
588 { "keepintvl", CTLTYPE_INT }, \
589 { "sendspace", CTLTYPE_INT }, \
590 { "recvspace", CTLTYPE_INT }, \
591 { "keepinit", CTLTYPE_INT }, \
592 { "pcblist", CTLTYPE_STRUCT }, \
593 { "delacktime", CTLTYPE_INT }, \
594 { "v6mssdflt", CTLTYPE_INT }, \
595 { "maxid", CTLTYPE_INT }, \
596 }
597
598
599 #ifdef _KERNEL
600 #ifdef SYSCTL_DECL
601 SYSCTL_DECL(_net_inet_tcp);
602 SYSCTL_DECL(_net_inet_tcp_sack);
603 MALLOC_DECLARE(M_TCPLOG);
604 #endif
605
606 VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */
607 VNET_DECLARE(struct inpcbinfo, tcbinfo);
608 VNET_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
609 extern int tcp_log_in_vain;
610 VNET_DECLARE(int, tcp_mssdflt); /* XXX */
611 VNET_DECLARE(int, tcp_minmss);
612 VNET_DECLARE(int, tcp_delack_enabled);
613 VNET_DECLARE(int, tcp_do_rfc3390);
614 VNET_DECLARE(int, path_mtu_discovery);
615 VNET_DECLARE(int, ss_fltsz);
616 VNET_DECLARE(int, ss_fltsz_local);
617 VNET_DECLARE(int, tcp_do_rfc3465);
618 VNET_DECLARE(int, tcp_abc_l_var);
619 #define V_tcb VNET(tcb)
620 #define V_tcbinfo VNET(tcbinfo)
621 #define V_tcpstat VNET(tcpstat)
622 #define V_tcp_mssdflt VNET(tcp_mssdflt)
623 #define V_tcp_minmss VNET(tcp_minmss)
624 #define V_tcp_delack_enabled VNET(tcp_delack_enabled)
625 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
626 #define V_path_mtu_discovery VNET(path_mtu_discovery)
627 #define V_ss_fltsz VNET(ss_fltsz)
628 #define V_ss_fltsz_local VNET(ss_fltsz_local)
629 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
630 #define V_tcp_abc_l_var VNET(tcp_abc_l_var)
631
632 VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */
633 VNET_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
637 VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */
638 VNET_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
642 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
643 #define V_tcp_hhh VNET(tcp_hhh)
644
645 int tcp_addoptions(struct tcpopt *, u_char *);
646 int tcp_ccalgounload(struct cc_algo *unload_algo);
647 struct tcpcb *
648 tcp_close(struct tcpcb *);
649 void tcp_discardcb(struct tcpcb *);
650 void tcp_twstart(struct tcpcb *);
651 #if 0
652 int tcp_twrecycleable(struct tcptw *tw);
653 #endif
654 void tcp_twclose(struct tcptw *_tw, int _reuse);
655 void tcp_ctlinput(int, struct sockaddr *, void *);
656 int tcp_ctloutput(struct socket *, struct sockopt *);
657 struct tcpcb *
658 tcp_drop(struct tcpcb *, int);
659 void tcp_drain(void);
660 void tcp_init(void);
661 #ifdef VIMAGE
662 void tcp_destroy(void);
663 #endif
664 void tcp_fini(void *);
665 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
666 const void *);
667 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
668 const void *);
669 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
670 void tcp_reass_init(void);
671 void tcp_reass_flush(struct tcpcb *);
672 #ifdef VIMAGE
673 void tcp_reass_destroy(void);
674 #endif
675 void tcp_input(struct mbuf *, int);
676 u_long tcp_maxmtu(struct in_conninfo *, int *);
677 u_long tcp_maxmtu6(struct in_conninfo *, int *);
678 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
679 int *);
680 void tcp_mss(struct tcpcb *, int);
681 int tcp_mssopt(struct in_conninfo *);
682 struct inpcb *
683 tcp_drop_syn_sent(struct inpcb *, int);
684 struct inpcb *
685 tcp_mtudisc(struct inpcb *, int);
686 struct tcpcb *
687 tcp_newtcpcb(struct inpcb *);
688 int tcp_output(struct tcpcb *);
689 void tcp_respond(struct tcpcb *, void *,
690 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
691 void tcp_tw_init(void);
692 #ifdef VIMAGE
693 void tcp_tw_destroy(void);
694 #endif
695 void tcp_tw_zone_change(void);
696 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
697 struct mbuf *, int);
698 int tcp_twrespond(struct tcptw *, int);
699 void tcp_setpersist(struct tcpcb *);
700 #ifdef TCP_SIGNATURE
701 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
702 int tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *,
703 struct tcphdr *, u_int);
704 #endif
705 void tcp_slowtimo(void);
706 struct tcptemp *
707 tcpip_maketemplate(struct inpcb *);
708 void tcpip_fillheaders(struct inpcb *, void *, void *);
709 void tcp_timer_activate(struct tcpcb *, int, u_int);
710 int tcp_timer_active(struct tcpcb *, int);
711 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
712 /*
713 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
714 */
715 void tcp_hc_init(void);
716 #ifdef VIMAGE
717 void tcp_hc_destroy(void);
718 #endif
719 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
720 u_long tcp_hc_getmtu(struct in_conninfo *);
721 void tcp_hc_updatemtu(struct in_conninfo *, u_long);
722 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
723
724 extern struct pr_usrreqs tcp_usrreqs;
725 extern u_long tcp_sendspace;
726 extern u_long tcp_recvspace;
727 tcp_seq tcp_new_isn(struct tcpcb *);
728
729 void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
730 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
731 void tcp_clean_sackreport(struct tcpcb *tp);
732 void tcp_sack_adjust(struct tcpcb *tp);
733 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
734 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
735 void tcp_free_sackholes(struct tcpcb *tp);
736 int tcp_newreno(struct tcpcb *, struct tcphdr *);
737 u_long tcp_seq_subtract(u_long, u_long );
738
739 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
740
741 #endif /* _KERNEL */
742
743 #endif /* _NETINET_TCP_VAR_H_ */
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