1 /* $OpenBSD: tcp_var.h,v 1.83 2007/06/25 12:17:43 markus Exp $ */
2 /* $NetBSD: tcp_var.h,v 1.17 1996/02/13 23:44:24 christos Exp $ */
3
4 /*
5 * Copyright (c) 1982, 1986, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)tcp_var.h 8.3 (Berkeley) 4/10/94
33 */
34
35 #ifndef _NETINET_TCP_VAR_H_
36 #define _NETINET_TCP_VAR_H_
37
38 /*
39 * Kernel variables for tcp.
40 */
41
42 struct sackblk {
43 tcp_seq start; /* start seq no. of sack block */
44 tcp_seq end; /* end seq no. */
45 };
46
47 struct sackhole {
48 tcp_seq start; /* start seq no. of hole */
49 tcp_seq end; /* end seq no. */
50 int dups; /* number of dup(s)acks for this hole */
51 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
52 struct sackhole *next; /* next in list */
53 };
54
55 /*
56 * TCP sequence queue structures.
57 */
58 TAILQ_HEAD(tcpqehead, tcpqent);
59 struct tcpqent {
60 TAILQ_ENTRY(tcpqent) tcpqe_q;
61 struct tcphdr *tcpqe_tcp;
62 struct mbuf *tcpqe_m; /* mbuf contains packet */
63 };
64
65 /*
66 * Tcp control block, one per tcp; fields:
67 */
68 struct tcpcb {
69 struct tcpqehead t_segq; /* sequencing queue */
70 struct timeout t_timer[TCPT_NTIMERS]; /* tcp timers */
71 short t_state; /* state of this connection */
72 short t_rxtshift; /* log(2) of rexmt exp. backoff */
73 short t_rxtcur; /* current retransmit value */
74 short t_dupacks; /* consecutive dup acks recd */
75 u_short t_maxseg; /* maximum segment size */
76 char t_force; /* 1 if forcing out a byte */
77 u_int t_flags;
78 #define TF_ACKNOW 0x0001 /* ack peer immediately */
79 #define TF_DELACK 0x0002 /* ack, but try to delay it */
80 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */
81 #define TF_NOOPT 0x0008 /* don't use tcp options */
82 #define TF_SENTFIN 0x0010 /* have sent FIN */
83 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */
84 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */
85 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */
86 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */
87 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */
88 #define TF_SIGNATURE 0x0400 /* require TCP MD5 signature */
89 #ifdef TCP_ECN
90 #define TF_ECN_PERMIT 0x00008000 /* other side said I could ECN */
91 #define TF_RCVD_CE 0x00010000 /* send ECE in subsequent segs */
92 #define TF_SEND_CWR 0x00020000 /* send CWR in next seg */
93 #define TF_DISABLE_ECN 0x00040000 /* disable ECN for this connection */
94 #endif
95 #define TF_REASSLOCK 0x00080000 /* reassembling or draining */
96 #define TF_LASTIDLE 0x00100000 /* no outstanding ACK on last send */
97 #define TF_DEAD 0x00200000 /* dead and to-be-released */
98 #define TF_PMTUD_PEND 0x00400000 /* Path MTU Discovery pending */
99
100 struct mbuf *t_template; /* skeletal packet for transmit */
101 struct inpcb *t_inpcb; /* back pointer to internet pcb */
102 struct timeout t_delack_to; /* delayed ACK callback */
103 /*
104 * The following fields are used as in the protocol specification.
105 * See RFC793, Dec. 1981, page 21.
106 */
107 /* send sequence variables */
108 tcp_seq snd_una; /* send unacknowledged */
109 tcp_seq snd_nxt; /* send next */
110 tcp_seq snd_up; /* send urgent pointer */
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 u_long snd_wnd; /* send window */
115 #if 1 /*def TCP_SACK*/
116 int sack_enable; /* enable SACK for this connection */
117 int snd_numholes; /* number of holes seen by sender */
118 struct sackhole *snd_holes; /* linked list of holes (sorted) */
119 #if 1 /*defined(TCP_SACK) && defined(TCP_FACK)*/
120 tcp_seq snd_fack; /* for FACK congestion control */
121 u_long snd_awnd; /* snd_nxt - snd_fack + */
122 /* retransmitted data */
123 int retran_data; /* amount of outstanding retx. data */
124 #endif /* TCP_FACK */
125 #endif /* TCP_SACK */
126 #if 1 /*defined(TCP_SACK) || defined(TCP_ECN)*/
127 tcp_seq snd_last; /* for use in fast recovery */
128 #endif
129 /* receive sequence variables */
130 u_long rcv_wnd; /* receive window */
131 tcp_seq rcv_nxt; /* receive next */
132 tcp_seq rcv_up; /* receive urgent pointer */
133 tcp_seq irs; /* initial receive sequence number */
134 #if 1 /*def TCP_SACK*/
135 tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/
136 int rcv_numsacks; /* # distinct sack blks present */
137 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
138 #endif
139
140 /*
141 * Additional variables for this implementation.
142 */
143 /* receive variables */
144 tcp_seq rcv_adv; /* advertised window */
145 /* retransmit variables */
146 tcp_seq snd_max; /* highest sequence number sent;
147 * used to recognize retransmits
148 */
149 /* congestion control (for slow start, source quench, retransmit after loss) */
150 u_long snd_cwnd; /* congestion-controlled window */
151 u_long snd_ssthresh; /* snd_cwnd size threshold for
152 * for slow start exponential to
153 * linear switch
154 */
155 u_short t_maxopd; /* mss plus options */
156 u_short t_peermss; /* peer's maximum segment size */
157
158 /*
159 * transmit timing stuff. See below for scale of srtt and rttvar.
160 * "Variance" is actually smoothed difference.
161 */
162 uint32_t t_rcvtime; /* time last segment received */
163 uint32_t t_rtttime; /* time we started measuring rtt */
164 tcp_seq t_rtseq; /* sequence number being timed */
165 short t_srtt; /* smoothed round-trip time */
166 short t_rttvar; /* variance in round-trip time */
167 u_short t_rttmin; /* minimum rtt allowed */
168 u_long max_sndwnd; /* largest window peer has offered */
169
170 /* out-of-band data */
171 char t_oobflags; /* have some */
172 char t_iobc; /* input character */
173 #define TCPOOB_HAVEDATA 0x01
174 #define TCPOOB_HADDATA 0x02
175 short t_softerror; /* possible error not yet reported */
176
177 /* RFC 1323 variables */
178 u_char snd_scale; /* window scaling for send window */
179 u_char rcv_scale; /* window scaling for recv window */
180 u_char request_r_scale; /* pending window scaling */
181 u_char requested_s_scale;
182 u_int32_t ts_recent; /* timestamp echo data */
183 u_int32_t ts_modulate; /* modulation on timestamp */
184 u_int32_t ts_recent_age; /* when last updated */
185 tcp_seq last_ack_sent;
186
187 /* pointer for syn cache entries*/
188 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */
189
190 /* Path-MTU Discovery Information */
191 u_int t_pmtud_mss_acked; /* MSS acked, lower bound for MTU */
192 u_int t_pmtud_mtu_sent; /* MTU used, upper bound for MTU */
193 tcp_seq t_pmtud_th_seq; /* TCP SEQ from ICMP payload */
194 u_int t_pmtud_nextmtu; /* Advertised Next-Hop MTU from ICMP */
195 u_short t_pmtud_ip_len; /* IP length from ICMP payload */
196 u_short t_pmtud_ip_hl; /* IP header length from ICMP payload */
197
198 int pf;
199
200 struct timeout t_reap_to; /* delayed cleanup timeout */
201 };
202
203 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
204 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
205
206 #ifdef _KERNEL
207 extern int tcp_delack_ticks;
208 void tcp_delack(void *);
209
210 #define TCP_INIT_DELACK(tp) \
211 timeout_set(&(tp)->t_delack_to, tcp_delack, tp)
212
213 #define TCP_RESTART_DELACK(tp) \
214 timeout_add(&(tp)->t_delack_to, tcp_delack_ticks)
215
216 #define TCP_SET_DELACK(tp) \
217 do { \
218 if (((tp)->t_flags & TF_DELACK) == 0) { \
219 (tp)->t_flags |= TF_DELACK; \
220 TCP_RESTART_DELACK(tp); \
221 } \
222 } while (/*CONSTCOND*/0)
223
224 #define TCP_CLEAR_DELACK(tp) \
225 do { \
226 if ((tp)->t_flags & TF_DELACK) { \
227 (tp)->t_flags &= ~TF_DELACK; \
228 timeout_del(&(tp)->t_delack_to); \
229 } \
230 } while (/*CONSTCOND*/0)
231
232 /*
233 * Handy way of passing around TCP option info.
234 */
235 struct tcp_opt_info {
236 int ts_present;
237 u_int32_t ts_val;
238 u_int32_t ts_ecr;
239 u_int16_t maxseg;
240 };
241
242 /*
243 * Data for the TCP compressed state engine.
244 */
245 union syn_cache_sa {
246 struct sockaddr sa;
247 struct sockaddr_in sin;
248 #if 1 /*def INET6*/
249 struct sockaddr_in6 sin6;
250 #endif
251 };
252
253 struct syn_cache {
254 TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */
255 struct timeout sc_timer; /* rexmt timer */
256 union { /* cached route */
257 struct route route4;
258 #ifdef INET6
259 struct route_in6 route6;
260 #endif
261 } sc_route_u;
262 #define sc_route4 sc_route_u.route4
263 #ifdef INET6
264 #define sc_route6 sc_route_u.route6
265 #endif
266 long sc_win; /* advertised window */
267 int sc_bucketidx; /* our bucket index */
268 u_int32_t sc_hash;
269 u_int32_t sc_timestamp; /* timestamp from SYN */
270 u_int32_t sc_modulate; /* our timestamp modulator */
271 #if 0
272 u_int32_t sc_timebase; /* our local timebase */
273 #endif
274 union syn_cache_sa sc_src;
275 union syn_cache_sa sc_dst;
276 tcp_seq sc_irs;
277 tcp_seq sc_iss;
278 u_int sc_rxtcur; /* current rxt timeout */
279 u_int sc_rxttot; /* total time spend on queues */
280 u_short sc_rxtshift; /* for computing backoff */
281 u_short sc_flags;
282
283 #define SCF_UNREACH 0x0001 /* we've had an unreach error */
284 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */
285 #define SCF_DEAD 0x0004 /* this entry to be released */
286 #define SCF_SACK_PERMIT 0x0008 /* permit sack */
287 #define SCF_ECN_PERMIT 0x0010 /* permit ecn */
288 #define SCF_SIGNATURE 0x0020 /* enforce tcp signatures */
289
290 struct mbuf *sc_ipopts; /* IP options */
291 u_int16_t sc_peermaxseg;
292 u_int16_t sc_ourmaxseg;
293 u_int sc_request_r_scale : 4,
294 sc_requested_s_scale : 4;
295
296 struct tcpcb *sc_tp; /* tcb for listening socket */
297 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */
298 };
299
300 struct syn_cache_head {
301 TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */
302 u_short sch_length; /* # entries in bucket */
303 };
304
305 static __inline int tcp_reass_lock_try(struct tcpcb *);
306 static __inline void tcp_reass_unlock(struct tcpcb *);
307 #define tcp_reass_lock(tp) tcp_reass_lock_try(tp)
308
309 static __inline int
310 tcp_reass_lock_try(struct tcpcb *tp)
311 {
312 int s;
313
314 /* Use splvm() due to mbuf allocation. */
315 s = splvm();
316 if (tp->t_flags & TF_REASSLOCK) {
317 splx(s);
318 return (0);
319 }
320 tp->t_flags |= TF_REASSLOCK;
321 splx(s);
322 return (1);
323 }
324
325 static __inline void
326 tcp_reass_unlock(struct tcpcb *tp)
327 {
328 int s;
329
330 s = splvm();
331 tp->t_flags &= ~TF_REASSLOCK;
332 splx(s);
333 }
334 #endif /* _KERNEL */
335
336 /*
337 * The smoothed round-trip time and estimated variance
338 * are stored as fixed point numbers scaled by the values below.
339 * For convenience, these scales are also used in smoothing the average
340 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
341 * With these scales, srtt has 5 bits to the right of the binary point,
342 * and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the
343 * binary point, and is smoothed with an ALPHA of 0.75.
344 */
345 #define TCP_RTT_SHIFT 3 /* shift for srtt; 5 bits frac. */
346 #define TCP_RTTVAR_SHIFT 2 /* shift for rttvar; 4 bits */
347 #define TCP_RTT_BASE_SHIFT 2 /* remaining 2 bit shift */
348 #define TCP_RTT_MAX (1<<9) /* maximum rtt */
349
350 /*
351 * The initial retransmission should happen at rtt + 4 * rttvar.
352 * Because of the way we do the smoothing, srtt and rttvar
353 * will each average +1/2 tick of bias. When we compute
354 * the retransmit timer, we want 1/2 tick of rounding and
355 * 1 extra tick because of +-1/2 tick uncertainty in the
356 * firing of the timer. The bias will give us exactly the
357 * 1.5 tick we need. But, because the bias is
358 * statistical, we have to test that we don't drop below
359 * the minimum feasible timer (which is 2 ticks).
360 * This macro assumes that the value of (1 << TCP_RTTVAR_SHIFT)
361 * is the same as the multiplier for rttvar.
362 */
363 #define TCP_REXMTVAL(tp) \
364 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> TCP_RTT_BASE_SHIFT)
365
366 /*
367 * TCP statistics.
368 * Many of these should be kept per connection,
369 * but that's inconvenient at the moment.
370 */
371 struct tcpstat {
372 u_int32_t tcps_connattempt; /* connections initiated */
373 u_int32_t tcps_accepts; /* connections accepted */
374 u_int32_t tcps_connects; /* connections established */
375 u_int32_t tcps_drops; /* connections dropped */
376 u_int32_t tcps_conndrops; /* embryonic connections dropped */
377 u_int32_t tcps_closed; /* conn. closed (includes drops) */
378 u_int32_t tcps_segstimed; /* segs where we tried to get rtt */
379 u_int32_t tcps_rttupdated; /* times we succeeded */
380 u_int32_t tcps_delack; /* delayed acks sent */
381 u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
382 u_int32_t tcps_rexmttimeo; /* retransmit timeouts */
383 u_int32_t tcps_persisttimeo; /* persist timeouts */
384 u_int32_t tcps_persistdrop; /* connections dropped in persist */
385 u_int32_t tcps_keeptimeo; /* keepalive timeouts */
386 u_int32_t tcps_keepprobe; /* keepalive probes sent */
387 u_int32_t tcps_keepdrops; /* connections dropped in keepalive */
388
389 u_int32_t tcps_sndtotal; /* total packets sent */
390 u_int32_t tcps_sndpack; /* data packets sent */
391 u_int64_t tcps_sndbyte; /* data bytes sent */
392 u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */
393 u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
394 u_int64_t tcps_sndrexmitfast; /* Fast retransmits */
395 u_int32_t tcps_sndacks; /* ack-only packets sent */
396 u_int32_t tcps_sndprobe; /* window probes sent */
397 u_int32_t tcps_sndurg; /* packets sent with URG only */
398 u_int32_t tcps_sndwinup; /* window update-only packets sent */
399 u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
400
401 u_int32_t tcps_rcvtotal; /* total packets received */
402 u_int32_t tcps_rcvpack; /* packets received in sequence */
403 u_int64_t tcps_rcvbyte; /* bytes received in sequence */
404 u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */
405 u_int32_t tcps_rcvbadoff; /* packets received with bad offset */
406 u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */
407 u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */
408 u_int32_t tcps_rcvshort; /* packets received too short */
409 u_int32_t tcps_rcvduppack; /* duplicate-only packets received */
410 u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
411 u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */
412 u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
413 u_int32_t tcps_rcvoopack; /* out-of-order packets received */
414 u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */
415 u_int32_t tcps_rcvpackafterwin; /* packets with data after window */
416 u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
417 u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */
418 u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */
419 u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */
420 u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
421 u_int32_t tcps_rcvacktooold; /* rcvd acks for old data */
422 u_int32_t tcps_rcvackpack; /* rcvd ack packets */
423 u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
424 u_int32_t tcps_rcvwinupd; /* rcvd window update packets */
425 u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */
426 u_int32_t tcps_predack; /* times hdr predict ok for acks */
427 u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */
428
429 u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */
430 u_int32_t tcps_noport; /* no socket on port */
431 u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */
432
433 u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */
434 u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */
435 u_int32_t tcps_inhwcsum; /* input hardware-checksummed packets */
436 u_int32_t tcps_outhwcsum; /* output hardware-checksummed packets */
437
438 /* ECN stats */
439 u_int32_t tcps_ecn_accepts; /* ecn connections accepted */
440 u_int32_t tcps_ecn_rcvece; /* # of rcvd ece */
441 u_int32_t tcps_ecn_rcvcwr; /* # of rcvd cwr */
442 u_int32_t tcps_ecn_rcvce; /* # of rcvd ce in ip header */
443 u_int32_t tcps_ecn_sndect; /* # of cwr sent */
444 u_int32_t tcps_ecn_sndece; /* # of ece sent */
445 u_int32_t tcps_ecn_sndcwr; /* # of cwr sent */
446 u_int32_t tcps_cwr_ecn; /* # of cwnd reduced by ecn */
447 u_int32_t tcps_cwr_frecovery; /* # of cwnd reduced by fastrecovery */
448 u_int32_t tcps_cwr_timeout; /* # of cwnd reduced by timeout */
449
450 /* These statistics deal with the SYN cache. */
451 u_int64_t tcps_sc_added; /* # of entries added */
452 u_int64_t tcps_sc_completed; /* # of connections completed */
453 u_int64_t tcps_sc_timed_out; /* # of entries timed out */
454 u_int64_t tcps_sc_overflowed; /* # dropped due to overflow */
455 u_int64_t tcps_sc_reset; /* # dropped due to RST */
456 u_int64_t tcps_sc_unreach; /* # dropped due to ICMP unreach */
457 u_int64_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */
458 u_int64_t tcps_sc_aborted; /* # of entries aborted (no mem) */
459 u_int64_t tcps_sc_dupesyn; /* # of duplicate SYNs received */
460 u_int64_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */
461 u_int64_t tcps_sc_collisions; /* # of hash collisions */
462 u_int64_t tcps_sc_retransmitted;/* # of retransmissions */
463
464 u_int64_t tcps_conndrained; /* # of connections drained */
465
466 u_int64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
467 u_int64_t tcps_sack_rexmits; /* SACK rexmit segments */
468 u_int64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
469 u_int64_t tcps_sack_rcv_opts; /* SACK options received */
470 u_int64_t tcps_sack_snd_opts; /* SACK options sent */
471 };
472
473 /*
474 * Names for TCP sysctl objects.
475 */
476
477 #define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */
478 #define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */
479 #define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */
480 #define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */
481 #define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */
482 #define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */
483 #define TCPCTL_RECVSPACE 7 /* receive buffer space */
484 #define TCPCTL_SENDSPACE 8 /* send buffer space */
485 #define TCPCTL_IDENT 9 /* get connection owner */
486 #define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */
487 #define TCPCTL_MSSDFLT 11 /* Default maximum segment size */
488 #define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */
489 #define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */
490 #define TCPCTL_ECN 14 /* RFC3168 ECN */
491 #define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */
492 #define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */
493 #define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */
494 #define TCPCTL_REASS_LIMIT 18 /* max entries for tcp reass queues */
495 #define TCPCTL_DROP 19 /* drop tcp connection */
496 #define TCPCTL_SACKHOLE_LIMIT 20 /* max entries for tcp sack queues */
497 #define TCPCTL_MAXID 21
498
499 #define TCPCTL_NAMES { \
500 { 0, 0 }, \
501 { "rfc1323", CTLTYPE_INT }, \
502 { "keepinittime", CTLTYPE_INT }, \
503 { "keepidle", CTLTYPE_INT }, \
504 { "keepintvl", CTLTYPE_INT }, \
505 { "slowhz", CTLTYPE_INT }, \
506 { "baddynamic", CTLTYPE_STRUCT }, \
507 { "recvspace", CTLTYPE_INT }, \
508 { "sendspace", CTLTYPE_INT }, \
509 { "ident", CTLTYPE_STRUCT }, \
510 { "sack", CTLTYPE_INT }, \
511 { "mssdflt", CTLTYPE_INT }, \
512 { "rstppslimit", CTLTYPE_INT }, \
513 { "ackonpush", CTLTYPE_INT }, \
514 { "ecn", CTLTYPE_INT }, \
515 { "syncachelimit", CTLTYPE_INT }, \
516 { "synbucketlimit", CTLTYPE_INT }, \
517 { "rfc3390", CTLTYPE_INT }, \
518 { "reasslimit", CTLTYPE_INT }, \
519 { "drop", CTLTYPE_STRUCT }, \
520 { "sackholelimit", CTLTYPE_INT }, \
521 }
522
523 #define TCPCTL_VARS { \
524 NULL, \
525 &tcp_do_rfc1323, \
526 &tcptv_keep_init, \
527 &tcp_keepidle, \
528 &tcp_keepintvl, \
529 NULL, \
530 NULL, \
531 &tcp_recvspace, \
532 &tcp_sendspace, \
533 NULL, \
534 NULL, \
535 &tcp_mssdflt, \
536 &tcp_rst_ppslim, \
537 &tcp_ack_on_push, \
538 NULL, \
539 &tcp_syn_cache_limit, \
540 &tcp_syn_bucket_limit, \
541 &tcp_do_rfc3390, \
542 NULL, \
543 NULL, \
544 NULL \
545 }
546
547 struct tcp_ident_mapping {
548 struct sockaddr_storage faddr, laddr;
549 int euid, ruid;
550 };
551
552 #ifdef _KERNEL
553 extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */
554 extern struct tcpstat tcpstat; /* tcp statistics */
555 extern u_int32_t tcp_now; /* for RFC 1323 timestamps */
556 extern int tcp_do_rfc1323; /* enabled/disabled? */
557 extern int tcp_mssdflt; /* default maximum segment size */
558 extern int tcp_ack_on_push; /* ACK immediately on PUSH */
559 #ifdef TCP_SACK
560 extern int tcp_do_sack; /* SACK enabled/disabled */
561 extern struct pool sackhl_pool;
562 extern int tcp_sackhole_limit; /* max entries for tcp sack queues */
563 #endif
564 extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */
565 extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */
566
567 extern struct pool tcpqe_pool;
568 extern int tcp_reass_limit; /* max entries for tcp reass queues */
569
570 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */
571 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */
572
573 extern int tcp_syn_cache_size;
574 extern struct syn_cache_head tcp_syn_cache[];
575 extern u_long syn_cache_count;
576
577 int tcp_attach(struct socket *);
578 void tcp_canceltimers(struct tcpcb *);
579 struct tcpcb *
580 tcp_close(struct tcpcb *);
581 void tcp_reaper(void *);
582 int tcp_freeq(struct tcpcb *);
583 #if defined(INET6) && !defined(TCP6)
584 void tcp6_ctlinput(int, struct sockaddr *, void *);
585 #endif
586 void *tcp_ctlinput(int, struct sockaddr *, void *);
587 int tcp_ctloutput(int, struct socket *, int, int, struct mbuf **);
588 struct tcpcb *
589 tcp_disconnect(struct tcpcb *);
590 struct tcpcb *
591 tcp_drop(struct tcpcb *, int);
592 int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *,
593 struct mbuf *, int, struct tcp_opt_info *);
594 void tcp_drain(void);
595 void tcp_init(void);
596 #if defined(INET6) && !defined(TCP6)
597 int tcp6_input(struct mbuf **, int *, int);
598 #endif
599 void tcp_input(struct mbuf *, ...);
600 int tcp_mss(struct tcpcb *, int);
601 void tcp_mss_update(struct tcpcb *);
602 u_int tcp_hdrsz(struct tcpcb *);
603 void tcp_mtudisc(struct inpcb *, int);
604 void tcp_mtudisc_increase(struct inpcb *, int);
605 #ifdef INET6
606 void tcp6_mtudisc(struct inpcb *, int);
607 void tcp6_mtudisc_callback(struct in6_addr *);
608 #endif
609 struct tcpcb *
610 tcp_newtcpcb(struct inpcb *);
611 void tcp_notify(struct inpcb *, int);
612 int tcp_output(struct tcpcb *);
613 void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int);
614 int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *);
615 void tcp_rscale(struct tcpcb *, u_long);
616 void tcp_respond(struct tcpcb *, caddr_t, struct mbuf *, tcp_seq,
617 tcp_seq, int);
618 void tcp_setpersist(struct tcpcb *);
619 void tcp_slowtimo(void);
620 struct mbuf *
621 tcp_template(struct tcpcb *);
622 void tcp_trace(short, short, struct tcpcb *, caddr_t, int, int);
623 struct tcpcb *
624 tcp_usrclosed(struct tcpcb *);
625 int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
626 #if defined(INET6) && !defined(TCP6)
627 int tcp6_usrreq(struct socket *,
628 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *);
629 #endif
630 int tcp_usrreq(struct socket *,
631 int, struct mbuf *, struct mbuf *, struct mbuf *);
632 void tcp_xmit_timer(struct tcpcb *, int);
633 void tcpdropoldhalfopen(struct tcpcb *, u_int16_t);
634 #ifdef TCP_SACK
635 void tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int);
636 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq, tcp_seq);
637 void tcp_del_sackholes(struct tcpcb *, struct tcphdr *);
638 void tcp_clean_sackreport(struct tcpcb *tp);
639 void tcp_sack_adjust(struct tcpcb *tp);
640 struct sackhole *
641 tcp_sack_output(struct tcpcb *tp);
642 int tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
643 #ifdef DEBUG
644 void tcp_print_holes(struct tcpcb *tp);
645 #endif
646 #endif /* TCP_SACK */
647 #if defined(TCP_SACK)
648 int tcp_newreno(struct tcpcb *, struct tcphdr *);
649 u_long tcp_seq_subtract(u_long, u_long );
650 #endif /* TCP_SACK */
651 #ifdef TCP_SIGNATURE
652 int tcp_signature_apply(caddr_t, caddr_t, unsigned int);
653 int tcp_signature(struct tdb *, int, struct mbuf *, struct tcphdr *,
654 int, int, char *);
655 #endif /* TCP_SIGNATURE */
656 void tcp_rndiss_init(void);
657 tcp_seq tcp_rndiss_next(void);
658 u_int16_t
659 tcp_rndiss_encrypt(u_int16_t);
660 void tcp_set_iss_tsm(struct tcpcb *);
661
662 int syn_cache_add(struct sockaddr *, struct sockaddr *,
663 struct tcphdr *, unsigned int, struct socket *,
664 struct mbuf *, u_char *, int, struct tcp_opt_info *, tcp_seq *);
665 void syn_cache_unreach(struct sockaddr *, struct sockaddr *,
666 struct tcphdr *);
667 struct socket *syn_cache_get(struct sockaddr *, struct sockaddr *,
668 struct tcphdr *, unsigned int, unsigned int,
669 struct socket *so, struct mbuf *);
670 void syn_cache_init(void);
671 void syn_cache_insert(struct syn_cache *, struct tcpcb *);
672 struct syn_cache *syn_cache_lookup(struct sockaddr *, struct sockaddr *,
673 struct syn_cache_head **);
674 void syn_cache_reset(struct sockaddr *, struct sockaddr *,
675 struct tcphdr *);
676 int syn_cache_respond(struct syn_cache *, struct mbuf *);
677 void syn_cache_timer(void *);
678 void syn_cache_cleanup(struct tcpcb *);
679 void syn_cache_reaper(void *);
680
681 #endif /* _KERNEL */
682 #endif /* _NETINET_TCP_VAR_H_ */