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tcp_var.h @ 11b7f58

4.1155-freebsd-126-freebsd-12freebsd-9.3

Last change on this file since 11b7f58 was 11b7f58, checked in by Sebastian Huber <sebastian.huber@…>, on 10/24/13 at 12:46:25

Fix errno conflict

Newlib defines errno as

#define errno (*errno())

In case this is expanded in a function parameter, e.g.

void f(int errno) { ... }

then we have a function pointer parameter instead of the integer scalar.

Property mode set to 100644

File size: 25.9 KB

Line
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	#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
74	int ispare; /* explicit pad for 64bit alignment */
75	uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */
76	};
77
78	struct tcptemp {
79	u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
80	struct tcphdr tt_t;
81	};
82
83	#define tcp6cb tcpcb /* for KAME src sync over BSD's /
84
85	/* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */
86	#ifdef INET6
87	#define ND6_HINT(tp) \
88	do { \
89	if ((tp) && (tp)->t_inpcb && \
90	((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \
91	nd6_nud_hint(NULL, NULL, 0); \
92	} while (0)
93	#else
94	#define ND6_HINT(tp)
95	#endif
96
97	/*
98	* Tcp control block, one per tcp; fields:
99	* Organized for 16 byte cacheline efficiency.
100	*/
101	struct tcpcb {
102	struct tsegqe_head t_segq; /* segment reassembly queue */
103	void t_pspare[2]; / new reassembly queue */
104	int t_segqlen; /* segment reassembly queue length */
105	int t_dupacks; /* consecutive dup acks recd */
106
107	struct tcp_timer t_timers; / All the TCP timers in one struct */
108
109	struct inpcb t_inpcb; / back pointer to internet pcb */
110	int t_state; /* state of this connection */
111	u_int t_flags;
112
113	struct vnet t_vnet; / back pointer to parent vnet */
114
115	tcp_seq snd_una; /* send unacknowledged */
116	tcp_seq snd_max; /* highest sequence number sent;
117	* used to recognize retransmits
118	*/
119	tcp_seq snd_nxt; /* send next */
120	tcp_seq snd_up; /* send urgent pointer */
121
122	tcp_seq snd_wl1; /* window update seg seq number */
123	tcp_seq snd_wl2; /* window update seg ack number */
124	tcp_seq iss; /* initial send sequence number */
125	tcp_seq irs; /* initial receive sequence number */
126
127	tcp_seq rcv_nxt; /* receive next */
128	tcp_seq rcv_adv; /* advertised window */
129	u_long rcv_wnd; /* receive window */
130	tcp_seq rcv_up; /* receive urgent pointer */
131
132	u_long snd_wnd; /* send window */
133	u_long snd_cwnd; /* congestion-controlled window */
134	u_long snd_bwnd; /* bandwidth-controlled window */
135	u_long snd_ssthresh; /* snd_cwnd size threshold for
136	* for slow start exponential to
137	* linear switch
138	*/
139	u_long snd_bandwidth; /* calculated bandwidth or 0 */
140	tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
141
142	u_int t_maxopd; /* mss plus options */
143
144	u_int t_rcvtime; /* inactivity time */
145	u_int t_starttime; /* time connection was established */
146	u_int t_rtttime; /* RTT measurement start time */
147	tcp_seq t_rtseq; /* sequence number being timed */
148
149	u_int t_bw_rtttime; /* used for bandwidth calculation */
150	tcp_seq t_bw_rtseq; /* used for bandwidth calculation */
151
152	int t_rxtcur; /* current retransmit value (ticks) */
153	u_int t_maxseg; /* maximum segment size */
154	int t_srtt; /* smoothed round-trip time */
155	int t_rttvar; /* variance in round-trip time */
156
157	int t_rxtshift; /* log(2) of rexmt exp. backoff */
158	u_int t_rttmin; /* minimum rtt allowed */
159	u_int t_rttbest; /* best rtt we've seen */
160	u_long t_rttupdated; /* number of times rtt sampled */
161	u_long max_sndwnd; /* largest window peer has offered */
162
163	int t_softerror; /* possible error not yet reported */
164	/* out-of-band data */
165	char t_oobflags; /* have some */
166	char t_iobc; /* input character */
167	/* RFC 1323 variables */
168	u_char snd_scale; /* window scaling for send window */
169	u_char rcv_scale; /* window scaling for recv window */
170	u_char request_r_scale; /* pending window scaling */
171	u_int32_t ts_recent; /* timestamp echo data */
172	u_int ts_recent_age; /* when last updated */
173	u_int32_t ts_offset; /* our timestamp offset */
174
175	tcp_seq last_ack_sent;
176	/* experimental */
177	u_long snd_cwnd_prev; /* cwnd prior to retransmit */
178	u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
179	tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
180	u_int t_badrxtwin; /* window for retransmit recovery */
181	u_char snd_limited; /* segments limited transmitted */
182	/* SACK related state */
183	int snd_numholes; /* number of holes seen by sender */
184	TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
185	/* SACK scoreboard (sorted) */
186	tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
187	int rcv_numsacks; /* # distinct sack blks present */
188	struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
189	tcp_seq sack_newdata; /* New data xmitted in this recovery
190	episode starts at this seq number */
191	struct sackhint sackhint; /* SACK scoreboard hint */
192	int t_rttlow; /* smallest observerved RTT */
193	u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
194	int rfbuf_cnt; /* recv buffer autoscaling byte count */
195	struct toe_usrreqs t_tu; / offload operations vector */
196	void t_toe; / TOE pcb pointer */
197	int t_bytes_acked; /* # bytes acked during current RTT */
198
199	int t_ispare; /* explicit pad for 64bit alignment */
200	void t_pspare2[6]; / 2 CC / 4 TBD */
201	uint64_t _pad[12]; /* 7 UTO, 5 TBD (1-2 CC/RTT?) */
202	};
203
204	/*
205	* Flags and utility macros for the t_flags field.
206	*/
207	#define TF_ACKNOW 0x000001 /* ack peer immediately */
208	#define TF_DELACK 0x000002 /* ack, but try to delay it */
209	#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
210	#define TF_NOOPT 0x000008 /* don't use tcp options */
211	#define TF_SENTFIN 0x000010 /* have sent FIN */
212	#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
213	#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
214	#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
215	#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
216	#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
217	#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
218	#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
219	#define TF_NOPUSH 0x001000 /* don't push */
220	#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
221	#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
222	#define TF_LASTIDLE 0x040000 /* connection was previously idle */
223	#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
224	#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
225	#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
226	#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
227	#define TF_FORCEDATA 0x800000 /* force out a byte */
228	#define TF_TSO 0x1000000 /* TSO enabled on this connection */
229	#define TF_TOE 0x2000000 /* this connection is offloaded */
230	#define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */
231	#define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */
232	#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */
233
234	#define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY)
235	#define ENTER_FASTRECOVERY(tp) tp->t_flags \|= TF_FASTRECOVERY
236	#define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY
237
238	/*
239	* Flags for the t_oobflags field.
240	*/
241	#define TCPOOB_HAVEDATA 0x01
242	#define TCPOOB_HADDATA 0x02
243
244	#ifdef TCP_SIGNATURE
245	/*
246	* Defines which are needed by the xform_tcp module and tcp_[in\|out]put
247	* for SADB verification and lookup.
248	*/
249	#define TCP_SIGLEN 16 /* length of computed digest in bytes */
250	#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
251	#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
252	/*
253	* Only a single SA per host may be specified at this time. An SPI is
254	* needed in order for the KEY_ALLOCSA() lookup to work.
255	*/
256	#define TCP_SIG_SPI 0x1000
257	#endif /* TCP_SIGNATURE */
258
259	/*
260	* Structure to hold TCP options that are only used during segment
261	* processing (in tcp_input), but not held in the tcpcb.
262	* It's basically used to reduce the number of parameters
263	* to tcp_dooptions and tcp_addoptions.
264	* The binary order of the to_flags is relevant for packing of the
265	* options in tcp_addoptions.
266	*/
267	struct tcpopt {
268	u_int64_t to_flags; /* which options are present */
269	#define TOF_MSS 0x0001 /* maximum segment size */
270	#define TOF_SCALE 0x0002 /* window scaling */
271	#define TOF_SACKPERM 0x0004 /* SACK permitted */
272	#define TOF_TS 0x0010 /* timestamp */
273	#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
274	#define TOF_SACK 0x0080 /* Peer sent SACK option */
275	#define TOF_MAXOPT 0x0100
276	u_int32_t to_tsval; /* new timestamp */
277	u_int32_t to_tsecr; /* reflected timestamp */
278	u_char to_sacks; / pointer to the first SACK blocks */
279	u_char to_signature; / pointer to the TCP-MD5 signature */
280	u_int16_t to_mss; /* maximum segment size */
281	u_int8_t to_wscale; /* window scaling */
282	u_int8_t to_nsacks; /* number of SACK blocks */
283	};
284
285	/*
286	* Flags for tcp_dooptions.
287	*/
288	#define TO_SYN 0x01 /* parse SYN-only options */
289
290	struct hc_metrics_lite { /* must stay in sync with hc_metrics */
291	u_long rmx_mtu; /* MTU for this path */
292	u_long rmx_ssthresh; /* outbound gateway buffer limit */
293	u_long rmx_rtt; /* estimated round trip time */
294	u_long rmx_rttvar; /* estimated rtt variance */
295	u_long rmx_bandwidth; /* estimated bandwidth */
296	u_long rmx_cwnd; /* congestion window */
297	u_long rmx_sendpipe; /* outbound delay-bandwidth product */
298	u_long rmx_recvpipe; /* inbound delay-bandwidth product */
299	};
300
301	#ifndef _NETINET_IN_PCB_H_
302	struct in_conninfo;
303	#endif /* _NETINET_IN_PCB_H_ */
304
305	struct tcptw {
306	struct inpcb tw_inpcb; / XXX back pointer to internet pcb */
307	tcp_seq snd_nxt;
308	tcp_seq rcv_nxt;
309	tcp_seq iss;
310	tcp_seq irs;
311	u_short last_win; /* cached window value */
312	u_short tw_so_options; /* copy of so_options */
313	struct ucred tw_cred; / user credentials */
314	u_int32_t t_recent;
315	u_int32_t ts_offset; /* our timestamp offset */
316	u_int t_starttime;
317	int tw_time;
318	TAILQ_ENTRY(tcptw) tw_2msl;
319	};
320
321	#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
322	#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
323	#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
324
325	/*
326	* The smoothed round-trip time and estimated variance
327	* are stored as fixed point numbers scaled by the values below.
328	* For convenience, these scales are also used in smoothing the average
329	* (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
330	* With these scales, srtt has 3 bits to the right of the binary point,
331	* and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
332	* binary point, and is smoothed with an ALPHA of 0.75.
333	*/
334	#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
335	#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
336	#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
337	#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
338	#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
339
340	/*
341	* The initial retransmission should happen at rtt + 4 * rttvar.
342	* Because of the way we do the smoothing, srtt and rttvar
343	* will each average +1/2 tick of bias. When we compute
344	* the retransmit timer, we want 1/2 tick of rounding and
345	* 1 extra tick because of +-1/2 tick uncertainty in the
346	* firing of the timer. The bias will give us exactly the
347	* 1.5 tick we need. But, because the bias is
348	* statistical, we have to test that we don't drop below
349	* the minimum feasible timer (which is 2 ticks).
350	* This version of the macro adapted from a paper by Lawrence
351	* Brakmo and Larry Peterson which outlines a problem caused
352	* by insufficient precision in the original implementation,
353	* which results in inappropriately large RTO values for very
354	* fast networks.
355	*/
356	#define TCP_REXMTVAL(tp) \
357	max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
358	+ (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
359
360	/*
361	* TCP statistics.
362	* Many of these should be kept per connection,
363	* but that's inconvenient at the moment.
364	*/
365	struct tcpstat {
366	u_long tcps_connattempt; /* connections initiated */
367	u_long tcps_accepts; /* connections accepted */
368	u_long tcps_connects; /* connections established */
369	u_long tcps_drops; /* connections dropped */
370	u_long tcps_conndrops; /* embryonic connections dropped */
371	u_long tcps_minmssdrops; /* average minmss too low drops */
372	u_long tcps_closed; /* conn. closed (includes drops) */
373	u_long tcps_segstimed; /* segs where we tried to get rtt */
374	u_long tcps_rttupdated; /* times we succeeded */
375	u_long tcps_delack; /* delayed acks sent */
376	u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
377	u_long tcps_rexmttimeo; /* retransmit timeouts */
378	u_long tcps_persisttimeo; /* persist timeouts */
379	u_long tcps_keeptimeo; /* keepalive timeouts */
380	u_long tcps_keepprobe; /* keepalive probes sent */
381	u_long tcps_keepdrops; /* connections dropped in keepalive */
382
383	u_long tcps_sndtotal; /* total packets sent */
384	u_long tcps_sndpack; /* data packets sent */
385	u_long tcps_sndbyte; /* data bytes sent */
386	u_long tcps_sndrexmitpack; /* data packets retransmitted */
387	u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
388	u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */
389	u_long tcps_sndacks; /* ack-only packets sent */
390	u_long tcps_sndprobe; /* window probes sent */
391	u_long tcps_sndurg; /* packets sent with URG only */
392	u_long tcps_sndwinup; /* window update-only packets sent */
393	u_long tcps_sndctrl; /* control (SYN\|FIN\|RST) packets sent */
394
395	u_long tcps_rcvtotal; /* total packets received */
396	u_long tcps_rcvpack; /* packets received in sequence */
397	u_long tcps_rcvbyte; /* bytes received in sequence */
398	u_long tcps_rcvbadsum; /* packets received with ccksum errs */
399	u_long tcps_rcvbadoff; /* packets received with bad offset */
400	u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
401	u_long tcps_rcvshort; /* packets received too short */
402	u_long tcps_rcvduppack; /* duplicate-only packets received */
403	u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
404	u_long tcps_rcvpartduppack; /* packets with some duplicate data */
405	u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
406	u_long tcps_rcvoopack; /* out-of-order packets received */
407	u_long tcps_rcvoobyte; /* out-of-order bytes received */
408	u_long tcps_rcvpackafterwin; /* packets with data after window */
409	u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
410	u_long tcps_rcvafterclose; /* packets rcvd after "close" */
411	u_long tcps_rcvwinprobe; /* rcvd window probe packets */
412	u_long tcps_rcvdupack; /* rcvd duplicate acks */
413	u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
414	u_long tcps_rcvackpack; /* rcvd ack packets */
415	u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
416	u_long tcps_rcvwinupd; /* rcvd window update packets */
417	u_long tcps_pawsdrop; /* segments dropped due to PAWS */
418	u_long tcps_predack; /* times hdr predict ok for acks */
419	u_long tcps_preddat; /* times hdr predict ok for data pkts */
420	u_long tcps_pcbcachemiss;
421	u_long tcps_cachedrtt; /* times cached RTT in route updated */
422	u_long tcps_cachedrttvar; /* times cached rttvar updated */
423	u_long tcps_cachedssthresh; /* times cached ssthresh updated */
424	u_long tcps_usedrtt; /* times RTT initialized from route */
425	u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
426	u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
427	u_long tcps_persistdrop; /* timeout in persist state */
428	u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
429	u_long tcps_mturesent; /* resends due to MTU discovery */
430	u_long tcps_listendrop; /* listen queue overflows */
431	u_long tcps_badrst; /* ignored RSTs in the window */
432
433	u_long tcps_sc_added; /* entry added to syncache */
434	u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */
435	u_long tcps_sc_dupsyn; /* duplicate SYN packet */
436	u_long tcps_sc_dropped; /* could not reply to packet */
437	u_long tcps_sc_completed; /* successful extraction of entry */
438	u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */
439	u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */
440	u_long tcps_sc_reset; /* RST removed entry from syncache */
441	u_long tcps_sc_stale; /* timed out or listen socket gone */
442	u_long tcps_sc_aborted; /* syncache entry aborted */
443	u_long tcps_sc_badack; /* removed due to bad ACK */
444	u_long tcps_sc_unreach; /* ICMP unreachable received */
445	u_long tcps_sc_zonefail; /* zalloc() failed */
446	u_long tcps_sc_sendcookie; /* SYN cookie sent */
447	u_long tcps_sc_recvcookie; /* SYN cookie received */
448
449	u_long tcps_hc_added; /* entry added to hostcache */
450	u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */
451
452	u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
453
454	/* SACK related stats */
455	u_long tcps_sack_recovery_episode; /* SACK recovery episodes */
456	u_long tcps_sack_rexmits; /* SACK rexmit segments */
457	u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
458	u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */
459	u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */
460	u_long tcps_sack_sboverflow; /* times scoreboard overflowed */
461
462	/* ECN related stats */
463	u_long tcps_ecn_ce; /* ECN Congestion Experienced */
464	u_long tcps_ecn_ect0; /* ECN Capable Transport */
465	u_long tcps_ecn_ect1; /* ECN Capable Transport */
466	u_long tcps_ecn_shs; /* ECN successful handshakes */
467	u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
468
469	u_long _pad[12]; /* 6 UTO, 6 TBD */
470	};
471
472	#ifdef _KERNEL
473	/*
474	* In-kernel consumers can use these accessor macros directly to update
475	* stats.
476	*/
477	#define TCPSTAT_ADD(name, val) V_tcpstat.name += (val)
478	#define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
479
480	/*
481	* Kernel module consumers must use this accessor macro.
482	*/
483	void kmod_tcpstat_inc(int statnum);
484	#define KMOD_TCPSTAT_INC(name) \
485	kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long))
486	#endif
487
488	/*
489	* TCB structure exported to user-land via sysctl(3).
490	* Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
491	* included. Not all of our clients do.
492	*/
493	#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
494	struct xtcpcb {
495	size_t xt_len;
496	struct inpcb xt_inp;
497	struct tcpcb xt_tp;
498	struct xsocket xt_socket;
499	u_quad_t xt_alignment_hack;
500	};
501	#endif
502
503	/*
504	* Names for TCP sysctl objects
505	*/
506	#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
507	#define TCPCTL_MSSDFLT 3 /* MSS default */
508	#define TCPCTL_STATS 4 /* statistics (read-only) */
509	#define TCPCTL_RTTDFLT 5 /* default RTT estimate */
510	#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
511	#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
512	#define TCPCTL_SENDSPACE 8 /* send buffer space */
513	#define TCPCTL_RECVSPACE 9 /* receive buffer space */
514	#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
515	#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
516	#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
517	#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
518	#define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
519	#define TCPCTL_DROP 15 /* drop tcp connection */
520	#define TCPCTL_MAXID 16
521	#define TCPCTL_FINWAIT2_TIMEOUT 17
522
523	#define TCPCTL_NAMES { \
524	{ 0, 0 }, \
525	{ "rfc1323", CTLTYPE_INT }, \
526	{ "mssdflt", CTLTYPE_INT }, \
527	{ "stats", CTLTYPE_STRUCT }, \
528	{ "rttdflt", CTLTYPE_INT }, \
529	{ "keepidle", CTLTYPE_INT }, \
530	{ "keepintvl", CTLTYPE_INT }, \
531	{ "sendspace", CTLTYPE_INT }, \
532	{ "recvspace", CTLTYPE_INT }, \
533	{ "keepinit", CTLTYPE_INT }, \
534	{ "pcblist", CTLTYPE_STRUCT }, \
535	{ "delacktime", CTLTYPE_INT }, \
536	{ "v6mssdflt", CTLTYPE_INT }, \
537	{ "maxid", CTLTYPE_INT }, \
538	}
539
540
541	#ifdef _KERNEL
542	#ifdef SYSCTL_DECL
543	SYSCTL_DECL(_net_inet_tcp);
544	SYSCTL_DECL(_net_inet_tcp_sack);
545	MALLOC_DECLARE(M_TCPLOG);
546	#endif
547
548	VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */
549	VNET_DECLARE(struct inpcbinfo, tcbinfo);
550	VNET_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
551	extern int tcp_log_in_vain;
552	VNET_DECLARE(int, tcp_mssdflt); /* XXX */
553	VNET_DECLARE(int, tcp_minmss);
554	VNET_DECLARE(int, tcp_delack_enabled);
555	VNET_DECLARE(int, tcp_do_rfc3390);
556	VNET_DECLARE(int, tcp_do_newreno);
557	VNET_DECLARE(int, path_mtu_discovery);
558	VNET_DECLARE(int, ss_fltsz);
559	VNET_DECLARE(int, ss_fltsz_local);
560	#define V_tcb VNET(tcb)
561	#define V_tcbinfo VNET(tcbinfo)
562	#define V_tcpstat VNET(tcpstat)
563	#define V_tcp_mssdflt VNET(tcp_mssdflt)
564	#define V_tcp_minmss VNET(tcp_minmss)
565	#define V_tcp_delack_enabled VNET(tcp_delack_enabled)
566	#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
567	#define V_tcp_do_newreno VNET(tcp_do_newreno)
568	#define V_path_mtu_discovery VNET(path_mtu_discovery)
569	#define V_ss_fltsz VNET(ss_fltsz)
570	#define V_ss_fltsz_local VNET(ss_fltsz_local)
571
572	VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */
573	VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */
574	#define V_tcp_do_sack VNET(tcp_do_sack)
575	#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
576
577	VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */
578	VNET_DECLARE(int, tcp_ecn_maxretries);
579	#define V_tcp_do_ecn VNET(tcp_do_ecn)
580	#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
581
582	int tcp_addoptions(struct tcpopt , u_char );
583	struct tcpcb *
584	tcp_close(struct tcpcb *);
585	void tcp_discardcb(struct tcpcb *);
586	void tcp_twstart(struct tcpcb *);
587	#if 0
588	int tcp_twrecycleable(struct tcptw *tw);
589	#endif
590	void tcp_twclose(struct tcptw *_tw, int _reuse);
591	void tcp_ctlinput(int, struct sockaddr , void );
592	int tcp_ctloutput(struct socket , struct sockopt );
593	struct tcpcb *
594	tcp_drop(struct tcpcb *, int);
595	void tcp_drain(void);
596	void tcp_init(void);
597	#ifdef VIMAGE
598	void tcp_destroy(void);
599	#endif
600	void tcp_fini(void *);
601	char tcp_log_addrs(struct in_conninfo , struct tcphdr , void ,
602	const void *);
603	char tcp_log_vain(struct in_conninfo , struct tcphdr , void ,
604	const void *);
605	int tcp_reass(struct tcpcb , struct tcphdr , int , struct mbuf );
606	void tcp_reass_init(void);
607	void tcp_reass_flush(struct tcpcb *);
608	#ifdef VIMAGE
609	void tcp_reass_destroy(void);
610	#endif
611	void tcp_input(struct mbuf *, int);
612	u_long tcp_maxmtu(struct in_conninfo , int );
613	u_long tcp_maxmtu6(struct in_conninfo , int );
614	void tcp_mss_update(struct tcpcb , int, struct hc_metrics_lite , int *);
615	void tcp_mss(struct tcpcb *, int);
616	int tcp_mssopt(struct in_conninfo *);
617	struct inpcb *
618	tcp_drop_syn_sent(struct inpcb *, int);
619	struct inpcb *
620	tcp_mtudisc(struct inpcb *, int);
621	struct tcpcb *
622	tcp_newtcpcb(struct inpcb *);
623	int tcp_output(struct tcpcb *);
624	void tcp_respond(struct tcpcb , void ,
625	struct tcphdr , struct mbuf , tcp_seq, tcp_seq, int);
626	void tcp_tw_init(void);
627	#ifdef VIMAGE
628	void tcp_tw_destroy(void);
629	#endif
630	void tcp_tw_zone_change(void);
631	int tcp_twcheck(struct inpcb , struct tcpopt , struct tcphdr *,
632	struct mbuf *, int);
633	int tcp_twrespond(struct tcptw *, int);
634	void tcp_setpersist(struct tcpcb *);
635	#ifdef TCP_SIGNATURE
636	int tcp_signature_compute(struct mbuf , int, int, int, u_char , u_int);
637	#endif
638	void tcp_slowtimo(void);
639	struct tcptemp *
640	tcpip_maketemplate(struct inpcb *);
641	void tcpip_fillheaders(struct inpcb , void , void *);
642	void tcp_timer_activate(struct tcpcb *, int, u_int);
643	int tcp_timer_active(struct tcpcb *, int);
644	void tcp_trace(short, short, struct tcpcb , void , struct tcphdr *, int);
645	void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq);
646	/*
647	* All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
648	*/
649	void tcp_hc_init(void);
650	#ifdef VIMAGE
651	void tcp_hc_destroy(void);
652	#endif
653	void tcp_hc_get(struct in_conninfo , struct hc_metrics_lite );
654	u_long tcp_hc_getmtu(struct in_conninfo *);
655	void tcp_hc_updatemtu(struct in_conninfo *, u_long);
656	void tcp_hc_update(struct in_conninfo , struct hc_metrics_lite );
657
658	extern struct pr_usrreqs tcp_usrreqs;
659	extern u_long tcp_sendspace;
660	extern u_long tcp_recvspace;
661	tcp_seq tcp_new_isn(struct tcpcb *);
662
663	void tcp_sack_doack(struct tcpcb , struct tcpopt , tcp_seq);
664	void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
665	void tcp_clean_sackreport(struct tcpcb *tp);
666	void tcp_sack_adjust(struct tcpcb *tp);
667	struct sackhole tcp_sack_output(struct tcpcb tp, int *sack_bytes_rexmt);
668	void tcp_sack_partialack(struct tcpcb , struct tcphdr );
669	void tcp_free_sackholes(struct tcpcb *tp);
670	int tcp_newreno(struct tcpcb , struct tcphdr );
671	u_long tcp_seq_subtract(u_long, u_long );
672
673	#endif /* _KERNEL */
674
675	#endif /* _NETINET_TCP_VAR_H_ */

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source: rtems-libbsd/freebsd/sys/netinet/tcp_var.h @ 11b7f58

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