Annotation of sys/netinet/tcp_var.h, Revision 1.1.1.1
1.1 nbrk 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_ */
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