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 * $FreeBSD$
31 */
32
33 #ifndef _NETINET_TCP_VAR_H_
34 #define _NETINET_TCP_VAR_H_
35
36 #include <netinet/tcp.h>
37
38 /*
39 * Kernel variables for tcp.
40 */
41 extern int tcp_do_rfc1323;
42
43 /* TCP segment queue entry */
44 struct tseg_qent {
45 LIST_ENTRY(tseg_qent) tqe_q;
46 int tqe_len; /* TCP segment data length */
47 struct tcphdr *tqe_th; /* a pointer to tcp header */
48 struct mbuf *tqe_m; /* mbuf contains packet */
49 };
50 LIST_HEAD(tsegqe_head, tseg_qent);
51
52 struct sackblk {
53 tcp_seq start; /* start seq no. of sack block */
54 tcp_seq end; /* end seq no. */
55 };
56
57 struct sackhole {
58 tcp_seq start; /* start seq no. of hole */
59 tcp_seq end; /* end seq no. */
60 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
61 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
62 };
63
64 struct sackhint {
65 struct sackhole *nexthole;
66 int sack_bytes_rexmit;
67 };
68
69 struct tcptemp {
70 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
71 struct tcphdr tt_t;
72 };
73
74 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
75
76 /* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */
77 #ifdef INET6
78 #define ND6_HINT(tp) \
79 do { \
80 if ((tp) && (tp)->t_inpcb && \
81 ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \
82 nd6_nud_hint(NULL, NULL, 0); \
83 } while (0)
84 #else
85 #define ND6_HINT(tp)
86 #endif
87
88 /*
89 * Tcp control block, one per tcp; fields:
90 * Organized for 16 byte cacheline efficiency.
91 */
92 struct tcpcb {
93 struct tsegqe_head t_segq; /* segment reassembly queue */
94 int t_segqlen; /* segment reassembly queue length */
95 int t_dupacks; /* consecutive dup acks recd */
96
97 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
98
99 struct inpcb *t_inpcb; /* back pointer to internet pcb */
100 int t_state; /* state of this connection */
101 u_int t_flags;
102
103 tcp_seq snd_una; /* send unacknowledged */
104 tcp_seq snd_max; /* highest sequence number sent;
105 * used to recognize retransmits
106 */
107 tcp_seq snd_nxt; /* send next */
108 tcp_seq snd_up; /* send urgent pointer */
109
110 tcp_seq snd_wl1; /* window update seg seq number */
111 tcp_seq snd_wl2; /* window update seg ack number */
112 tcp_seq iss; /* initial send sequence number */
113 tcp_seq irs; /* initial receive sequence number */
114
115 tcp_seq rcv_nxt; /* receive next */
116 tcp_seq rcv_adv; /* advertised window */
117 u_long rcv_wnd; /* receive window */
118 tcp_seq rcv_up; /* receive urgent pointer */
119
120 u_long snd_wnd; /* send window */
121 u_long snd_cwnd; /* congestion-controlled window */
122 u_long snd_bwnd; /* bandwidth-controlled window */
123 u_long snd_ssthresh; /* snd_cwnd size threshold for
124 * for slow start exponential to
125 * linear switch
126 */
127 u_long snd_bandwidth; /* calculated bandwidth or 0 */
128 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
129
130 u_int t_maxopd; /* mss plus options */
131
132 u_long t_rcvtime; /* inactivity time */
133 u_long t_starttime; /* time connection was established */
134 int t_rtttime; /* round trip time */
135 tcp_seq t_rtseq; /* sequence number being timed */
136
137 int t_bw_rtttime; /* used for bandwidth calculation */
138 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */
139
140 int t_rxtcur; /* current retransmit value (ticks) */
141 u_int t_maxseg; /* maximum segment size */
142 int t_srtt; /* smoothed round-trip time */
143 int t_rttvar; /* variance in round-trip time */
144
145 int t_rxtshift; /* log(2) of rexmt exp. backoff */
146 u_int t_rttmin; /* minimum rtt allowed */
147 u_int t_rttbest; /* best rtt we've seen */
148 u_long t_rttupdated; /* number of times rtt sampled */
149 u_long max_sndwnd; /* largest window peer has offered */
150
151 int t_softerror; /* possible error not yet reported */
152 /* out-of-band data */
153 char t_oobflags; /* have some */
154 char t_iobc; /* input character */
155 /* RFC 1323 variables */
156 u_char snd_scale; /* window scaling for send window */
157 u_char rcv_scale; /* window scaling for recv window */
158 u_char request_r_scale; /* pending window scaling */
159 u_int32_t ts_recent; /* timestamp echo data */
160 u_long ts_recent_age; /* when last updated */
161 u_int32_t ts_offset; /* our timestamp offset */
162
163 tcp_seq last_ack_sent;
164 /* experimental */
165 u_long snd_cwnd_prev; /* cwnd prior to retransmit */
166 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
167 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
168 u_long t_badrxtwin; /* window for retransmit recovery */
169 u_char snd_limited; /* segments limited transmitted */
170 /* SACK related state */
171 int snd_numholes; /* number of holes seen by sender */
172 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
173 /* SACK scoreboard (sorted) */
174 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
175 int rcv_numsacks; /* # distinct sack blks present */
176 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
177 tcp_seq sack_newdata; /* New data xmitted in this recovery
178 episode starts at this seq number */
179 struct sackhint sackhint; /* SACK scoreboard hint */
180 int t_rttlow; /* smallest observerved RTT */
181 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
182 int rfbuf_cnt; /* recv buffer autoscaling byte count */
183 void *t_pspare[3]; /* toe usrreqs / toepcb * / congestion algo / vimage / 1 general use */
184 struct toe_usrreqs *t_tu; /* offload operations vector */
185 void *t_toe; /* TOE pcb pointer */
186 };
187
188 /*
189 * Flags and utility macros for the t_flags field.
190 */
191 #define TF_ACKNOW 0x000001 /* ack peer immediately */
192 #define TF_DELACK 0x000002 /* ack, but try to delay it */
193 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
194 #define TF_NOOPT 0x000008 /* don't use tcp options */
195 #define TF_SENTFIN 0x000010 /* have sent FIN */
196 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
197 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
198 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
199 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
200 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
201 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
202 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
203 #define TF_NOPUSH 0x001000 /* don't push */
204 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */
205 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
206 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
207 #define TF_LASTIDLE 0x040000 /* connection was previously idle */
208 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
209 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
210 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
211 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
212 #define TF_FORCEDATA 0x800000 /* force out a byte */
213 #define TF_TSO 0x1000000 /* TSO enabled on this connection */
214 #define TF_TOE 0x2000000 /* this connection is offloaded */
215
216 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY)
217 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY
218 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY
219
220 /*
221 * Flags for the t_oobflags field.
222 */
223 #define TCPOOB_HAVEDATA 0x01
224 #define TCPOOB_HADDATA 0x02
225
226 #ifdef TCP_SIGNATURE
227 /*
228 * Defines which are needed by the xform_tcp module and tcp_[in|out]put
229 * for SADB verification and lookup.
230 */
231 #define TCP_SIGLEN 16 /* length of computed digest in bytes */
232 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
233 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
234 /*
235 * Only a single SA per host may be specified at this time. An SPI is
236 * needed in order for the KEY_ALLOCSA() lookup to work.
237 */
238 #define TCP_SIG_SPI 0x1000
239 #endif /* TCP_SIGNATURE */
240
241 /*
242 * Structure to hold TCP options that are only used during segment
243 * processing (in tcp_input), but not held in the tcpcb.
244 * It's basically used to reduce the number of parameters
245 * to tcp_dooptions and tcp_addoptions.
246 * The binary order of the to_flags is relevant for packing of the
247 * options in tcp_addoptions.
248 */
249 struct tcpopt {
250 u_long to_flags; /* which options are present */
251 #define TOF_MSS 0x0001 /* maximum segment size */
252 #define TOF_SCALE 0x0002 /* window scaling */
253 #define TOF_SACKPERM 0x0004 /* SACK permitted */
254 #define TOF_TS 0x0010 /* timestamp */
255 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
256 #define TOF_SACK 0x0080 /* Peer sent SACK option */
257 #define TOF_MAXOPT 0x0100
258 u_int32_t to_tsval; /* new timestamp */
259 u_int32_t to_tsecr; /* reflected timestamp */
260 u_int16_t to_mss; /* maximum segment size */
261 u_int8_t to_wscale; /* window scaling */
262 u_int8_t to_nsacks; /* number of SACK blocks */
263 u_char *to_sacks; /* pointer to the first SACK blocks */
264 u_char *to_signature; /* pointer to the TCP-MD5 signature */
265 };
266
267 /*
268 * Flags for tcp_dooptions.
269 */
270 #define TO_SYN 0x01 /* parse SYN-only options */
271
272 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
273 u_long rmx_mtu; /* MTU for this path */
274 u_long rmx_ssthresh; /* outbound gateway buffer limit */
275 u_long rmx_rtt; /* estimated round trip time */
276 u_long rmx_rttvar; /* estimated rtt variance */
277 u_long rmx_bandwidth; /* estimated bandwidth */
278 u_long rmx_cwnd; /* congestion window */
279 u_long rmx_sendpipe; /* outbound delay-bandwidth product */
280 u_long rmx_recvpipe; /* inbound delay-bandwidth product */
281 };
282
283 #ifndef _NETINET_IN_PCB_H_
284 struct in_conninfo;
285 #endif /* _NETINET_IN_PCB_H_ */
286
287 struct tcptw {
288 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
289 tcp_seq snd_nxt;
290 tcp_seq rcv_nxt;
291 tcp_seq iss;
292 tcp_seq irs;
293 u_short last_win; /* cached window value */
294 u_short tw_so_options; /* copy of so_options */
295 struct ucred *tw_cred; /* user credentials */
296 u_long t_recent;
297 u_int32_t ts_offset; /* our timestamp offset */
298 u_long t_starttime;
299 int tw_time;
300 TAILQ_ENTRY(tcptw) tw_2msl;
301 };
302
303 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
304 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
305 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
306
307 /*
308 * The smoothed round-trip time and estimated variance
309 * are stored as fixed point numbers scaled by the values below.
310 * For convenience, these scales are also used in smoothing the average
311 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
312 * With these scales, srtt has 3 bits to the right of the binary point,
313 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
314 * binary point, and is smoothed with an ALPHA of 0.75.
315 */
316 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
317 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
318 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
319 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
320 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
321
322 /*
323 * The initial retransmission should happen at rtt + 4 * rttvar.
324 * Because of the way we do the smoothing, srtt and rttvar
325 * will each average +1/2 tick of bias. When we compute
326 * the retransmit timer, we want 1/2 tick of rounding and
327 * 1 extra tick because of +-1/2 tick uncertainty in the
328 * firing of the timer. The bias will give us exactly the
329 * 1.5 tick we need. But, because the bias is
330 * statistical, we have to test that we don't drop below
331 * the minimum feasible timer (which is 2 ticks).
332 * This version of the macro adapted from a paper by Lawrence
333 * Brakmo and Larry Peterson which outlines a problem caused
334 * by insufficient precision in the original implementation,
335 * which results in inappropriately large RTO values for very
336 * fast networks.
337 */
338 #define TCP_REXMTVAL(tp) \
339 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
340 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
341
342 /*
343 * TCP statistics.
344 * Many of these should be kept per connection,
345 * but that's inconvenient at the moment.
346 */
347 struct tcpstat {
348 u_long tcps_connattempt; /* connections initiated */
349 u_long tcps_accepts; /* connections accepted */
350 u_long tcps_connects; /* connections established */
351 u_long tcps_drops; /* connections dropped */
352 u_long tcps_conndrops; /* embryonic connections dropped */
353 u_long tcps_minmssdrops; /* average minmss too low drops */
354 u_long tcps_closed; /* conn. closed (includes drops) */
355 u_long tcps_segstimed; /* segs where we tried to get rtt */
356 u_long tcps_rttupdated; /* times we succeeded */
357 u_long tcps_delack; /* delayed acks sent */
358 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
359 u_long tcps_rexmttimeo; /* retransmit timeouts */
360 u_long tcps_persisttimeo; /* persist timeouts */
361 u_long tcps_keeptimeo; /* keepalive timeouts */
362 u_long tcps_keepprobe; /* keepalive probes sent */
363 u_long tcps_keepdrops; /* connections dropped in keepalive */
364
365 u_long tcps_sndtotal; /* total packets sent */
366 u_long tcps_sndpack; /* data packets sent */
367 u_long tcps_sndbyte; /* data bytes sent */
368 u_long tcps_sndrexmitpack; /* data packets retransmitted */
369 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
370 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */
371 u_long tcps_sndacks; /* ack-only packets sent */
372 u_long tcps_sndprobe; /* window probes sent */
373 u_long tcps_sndurg; /* packets sent with URG only */
374 u_long tcps_sndwinup; /* window update-only packets sent */
375 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
376
377 u_long tcps_rcvtotal; /* total packets received */
378 u_long tcps_rcvpack; /* packets received in sequence */
379 u_long tcps_rcvbyte; /* bytes received in sequence */
380 u_long tcps_rcvbadsum; /* packets received with ccksum errs */
381 u_long tcps_rcvbadoff; /* packets received with bad offset */
382 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
383 u_long tcps_rcvshort; /* packets received too short */
384 u_long tcps_rcvduppack; /* duplicate-only packets received */
385 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
386 u_long tcps_rcvpartduppack; /* packets with some duplicate data */
387 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
388 u_long tcps_rcvoopack; /* out-of-order packets received */
389 u_long tcps_rcvoobyte; /* out-of-order bytes received */
390 u_long tcps_rcvpackafterwin; /* packets with data after window */
391 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
392 u_long tcps_rcvafterclose; /* packets rcvd after "close" */
393 u_long tcps_rcvwinprobe; /* rcvd window probe packets */
394 u_long tcps_rcvdupack; /* rcvd duplicate acks */
395 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
396 u_long tcps_rcvackpack; /* rcvd ack packets */
397 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
398 u_long tcps_rcvwinupd; /* rcvd window update packets */
399 u_long tcps_pawsdrop; /* segments dropped due to PAWS */
400 u_long tcps_predack; /* times hdr predict ok for acks */
401 u_long tcps_preddat; /* times hdr predict ok for data pkts */
402 u_long tcps_pcbcachemiss;
403 u_long tcps_cachedrtt; /* times cached RTT in route updated */
404 u_long tcps_cachedrttvar; /* times cached rttvar updated */
405 u_long tcps_cachedssthresh; /* times cached ssthresh updated */
406 u_long tcps_usedrtt; /* times RTT initialized from route */
407 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
408 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
409 u_long tcps_persistdrop; /* timeout in persist state */
410 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
411 u_long tcps_mturesent; /* resends due to MTU discovery */
412 u_long tcps_listendrop; /* listen queue overflows */
413 u_long tcps_badrst; /* ignored RSTs in the window */
414
415 u_long tcps_sc_added; /* entry added to syncache */
416 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
417 u_long tcps_sc_dupsyn; /* duplicate SYN packet */
418 u_long tcps_sc_dropped; /* could not reply to packet */
419 u_long tcps_sc_completed; /* successful extraction of entry */
420 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
421 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
422 u_long tcps_sc_reset; /* RST removed entry from syncache */
423 u_long tcps_sc_stale; /* timed out or listen socket gone */
424 u_long tcps_sc_aborted; /* syncache entry aborted */
425 u_long tcps_sc_badack; /* removed due to bad ACK */
426 u_long tcps_sc_unreach; /* ICMP unreachable received */
427 u_long tcps_sc_zonefail; /* zalloc() failed */
428 u_long tcps_sc_sendcookie; /* SYN cookie sent */
429 u_long tcps_sc_recvcookie; /* SYN cookie received */
430
431 u_long tcps_hc_added; /* entry added to hostcache */
432 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */
433
434 u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
435
436 /* SACK related stats */
437 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */
438 u_long tcps_sack_rexmits; /* SACK rexmit segments */
439 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
440 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */
441 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */
442 u_long tcps_sack_sboverflow; /* times scoreboard overflowed */
443 };
444
445 /*
446 * TCB structure exported to user-land via sysctl(3).
447 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
448 * included. Not all of our clients do.
449 */
450 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
451 struct xtcpcb {
452 size_t xt_len;
453 struct inpcb xt_inp;
454 struct tcpcb xt_tp;
455 struct xsocket xt_socket;
456 u_quad_t xt_alignment_hack;
457 };
458 #endif
459
460 /*
461 * Names for TCP sysctl objects
462 */
463 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
464 #define TCPCTL_MSSDFLT 3 /* MSS default */
465 #define TCPCTL_STATS 4 /* statistics (read-only) */
466 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
467 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
468 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
469 #define TCPCTL_SENDSPACE 8 /* send buffer space */
470 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
471 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
472 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
473 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
474 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
475 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
476 #define TCPCTL_DROP 15 /* drop tcp connection */
477 #define TCPCTL_MAXID 16
478 #define TCPCTL_FINWAIT2_TIMEOUT 17
479
480 #define TCPCTL_NAMES { \
481 { 0, 0 }, \
482 { "rfc1323", CTLTYPE_INT }, \
483 { "mssdflt", CTLTYPE_INT }, \
484 { "stats", CTLTYPE_STRUCT }, \
485 { "rttdflt", CTLTYPE_INT }, \
486 { "keepidle", CTLTYPE_INT }, \
487 { "keepintvl", CTLTYPE_INT }, \
488 { "sendspace", CTLTYPE_INT }, \
489 { "recvspace", CTLTYPE_INT }, \
490 { "keepinit", CTLTYPE_INT }, \
491 { "pcblist", CTLTYPE_STRUCT }, \
492 { "delacktime", CTLTYPE_INT }, \
493 { "v6mssdflt", CTLTYPE_INT }, \
494 { "maxid", CTLTYPE_INT }, \
495 }
496
497
498 #ifdef _KERNEL
499 #ifdef SYSCTL_DECL
500 SYSCTL_DECL(_net_inet_tcp);
501 SYSCTL_DECL(_net_inet_tcp_sack);
502 MALLOC_DECLARE(M_TCPLOG);
503 #endif
504
505 struct sockopt;
506
507 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */
508 extern struct inpcbinfo tcbinfo;
509 extern struct tcpstat tcpstat; /* tcp statistics */
510 extern int tcp_log_in_vain;
511 extern int tcp_mssdflt; /* XXX */
512 extern int tcp_minmss;
513 extern int tcp_delack_enabled;
514 extern int tcp_do_newreno;
515 extern int tcp_do_rfc3390;
516 extern int path_mtu_discovery;
517 extern int ss_fltsz;
518 extern int ss_fltsz_local;
519
520 extern int tcp_do_sack; /* SACK enabled/disabled */
521 extern int tcp_sc_rst_sock_fail; /* RST on sock alloc failure */
522
523 int tcp_addoptions(struct tcpopt *, u_char *);
524 struct tcpcb *
525 tcp_close(struct tcpcb *);
526 void tcp_discardcb(struct tcpcb *);
527 void tcp_twstart(struct tcpcb *);
528 #if 0
529 int tcp_twrecycleable(struct tcptw *tw);
530 #endif
531 void tcp_twclose(struct tcptw *_tw, int _reuse);
532 void tcp_ctlinput(int, struct sockaddr *, void *);
533 int tcp_ctloutput(struct socket *, struct sockopt *);
534 struct tcpcb *
535 tcp_drop(struct tcpcb *, int);
536 void tcp_drain(void);
537 void tcp_init(void);
538 void tcp_fini(void *);
539 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
540 const void *);
541 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
542 const void *);
543 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *);
544 void tcp_reass_init(void);
545 void tcp_reass_flush(struct tcpcb *);
546 void tcp_input(struct mbuf *, int);
547 u_long tcp_maxmtu(struct in_conninfo *, int *);
548 u_long tcp_maxmtu6(struct in_conninfo *, int *);
549 void tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *);
550 void tcp_mss(struct tcpcb *, int);
551 int tcp_mssopt(struct in_conninfo *);
552 struct inpcb *
553 tcp_drop_syn_sent(struct inpcb *, int);
554 struct inpcb *
555 tcp_mtudisc(struct inpcb *, int);
556 struct tcpcb *
557 tcp_newtcpcb(struct inpcb *);
558 int tcp_output(struct tcpcb *);
559 void tcp_respond(struct tcpcb *, void *,
560 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
561 void tcp_tw_init(void);
562 void tcp_tw_zone_change(void);
563 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
564 struct mbuf *, int);
565 int tcp_twrespond(struct tcptw *, int);
566 void tcp_setpersist(struct tcpcb *);
567 #ifdef TCP_SIGNATURE
568 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int);
569 #endif
570 void tcp_slowtimo(void);
571 struct tcptemp *
572 tcpip_maketemplate(struct inpcb *);
573 void tcpip_fillheaders(struct inpcb *, void *, void *);
574 void tcp_timer_activate(struct tcpcb *, int, u_int);
575 int tcp_timer_active(struct tcpcb *, int);
576 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
577 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
578 /*
579 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
580 */
581 void tcp_hc_init(void);
582 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
583 u_long tcp_hc_getmtu(struct in_conninfo *);
584 void tcp_hc_updatemtu(struct in_conninfo *, u_long);
585 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
586
587 extern struct pr_usrreqs tcp_usrreqs;
588 extern u_long tcp_sendspace;
589 extern u_long tcp_recvspace;
590 tcp_seq tcp_new_isn(struct tcpcb *);
591
592 void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
593 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
594 void tcp_clean_sackreport(struct tcpcb *tp);
595 void tcp_sack_adjust(struct tcpcb *tp);
596 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
597 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
598 void tcp_free_sackholes(struct tcpcb *tp);
599 int tcp_newreno(struct tcpcb *, struct tcphdr *);
600 u_long tcp_seq_subtract(u_long, u_long );
601
602 #endif /* _KERNEL */
603
604 #endif /* _NETINET_TCP_VAR_H_ */
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