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source: rtems/cpukit/libnetworking/netinet/tcp_var.h @ 2acc6ee

4.104.114.95

Last change on this file since 2acc6ee was 2acc6ee, checked in by Ralf Corsepius <ralf.corsepius@…>, on 09/01/08 at 06:33:59
Fix broken declaration of tcp_trace().
Property mode set to `100644`
File size: 16.5 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: src/sys/netinet/tcp_var.h,v 1.121 2005/04/21 20:11:01 ps Exp $
31	*/
32
33	/*
34	* $Id$
35	*/
36
37	#ifndef _NETINET_TCP_VAR_H_
38	#define _NETINET_TCP_VAR_H_
39
40	#include <netinet/tcp.h>
41
42	/*
43	* Kernel variables for tcp.
44	*/
45
46	#ifdef __BSD_VISIBLE
47	/*
48	* Tcp control block, one per tcp; fields:
49	*/
50	struct tcpcb {
51	struct tcpiphdr seg_next; / sequencing queue */
52	struct tcpiphdr *seg_prev;
53	int t_state; /* state of this connection */
54	u_int t_flags;
55	#define TF_ACKNOW 0x000001 /* ack peer immediately */
56	#define TF_DELACK 0x000002 /* ack, but try to delay it */
57	#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */
58	#define TF_NOOPT 0x000008 /* don't use tcp options */
59	#define TF_SENTFIN 0x000010 /* have sent FIN */
60	#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */
61	#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */
62	#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */
63	#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */
64	#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */
65	#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */
66	#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */
67	#define TF_NOPUSH 0x001000 /* don't push */
68	#define TF_REQ_CC 0x002000 /* have/will request CC */
69	#define TF_RCVD_CC 0x004000 /* a CC was received in SYN */
70	#define TF_SENDCCNEW 0x008000 /* send CCnew instead of CC in SYN */
71	#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */
72	#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */
73	#define TF_LASTIDLE 0x040000 /* connection was previously idle */
74	#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */
75	#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */
76	#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */
77	#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
78	int t_force; /* 1 if forcing out a byte */
79	int t_timer[TCPT_NTIMERS]; /* tcp timers */
80	int t_rxtshift; /* log(2) of rexmt exp. backoff */
81	int t_rxtcur; /* current retransmit value */
82	int t_dupacks; /* consecutive dup acks recd */
83	u_int t_maxseg; /* maximum segment size */
84	u_int t_maxopd; /* mss plus options */
85	struct tcpiphdr t_template; / skeletal packet for transmit */
86	struct inpcb t_inpcb; / back pointer to internet pcb */
87	/*
88	* The following fields are used as in the protocol specification.
89	* See RFC783, Dec. 1981, page 21.
90	*/
91	/* send sequence variables */
92	tcp_seq snd_una; /* send unacknowledged */
93	tcp_seq snd_max; /* highest sequence number sent;
94	* used to recognize retransmits
95	*/
96	tcp_seq snd_nxt; /* send next */
97	tcp_seq snd_up; /* send urgent pointer */
98
99	tcp_seq snd_wl1; /* window update seg seq number */
100	tcp_seq snd_wl2; /* window update seg ack number */
101	tcp_seq iss; /* initial send sequence number */
102	tcp_seq irs; /* initial receive sequence number */
103
104	tcp_seq rcv_nxt; /* receive next */
105	tcp_seq rcv_adv; /* advertised window */
106	u_long rcv_wnd; /* receive window */
107	tcp_seq rcv_up; /* receive urgent pointer */
108
109	u_long snd_wnd; /* send window */
110	/*
111	* Additional variables for this implementation.
112	*/
113	/* congestion control (for slow start, source quench, retransmit after loss) */
114	u_long snd_cwnd; /* congestion-controlled window */
115	u_long snd_ssthresh; /* snd_cwnd size threshold for
116	* for slow start exponential to
117	* linear switch
118	*/
119	/*
120	* transmit timing stuff. See below for scale of srtt and rttvar.
121	* "Variance" is actually smoothed difference.
122	*/
123	u_int t_idle; /* inactivity time */
124	int t_rtt; /* round trip time */
125	tcp_seq t_rtseq; /* sequence number being timed */
126	int t_srtt; /* smoothed round-trip time */
127	int t_rttvar; /* variance in round-trip time */
128	u_int t_rttmin; /* minimum rtt allowed */
129	u_long max_sndwnd; /* largest window peer has offered */
130
131	int t_softerror; /* possible error not yet reported */
132	/* out-of-band data */
133	char t_oobflags; /* have some */
134	char t_iobc; /* input character */
135	#define TCPOOB_HAVEDATA 0x01
136	#define TCPOOB_HADDATA 0x02
137	/* RFC 1323 variables */
138	u_char snd_scale; /* window scaling for send window */
139	u_char rcv_scale; /* window scaling for recv window */
140	u_char request_r_scale; /* pending window scaling */
141	u_char requested_s_scale;
142	u_long ts_recent; /* timestamp echo data */
143
144	u_long ts_recent_age; /* when last updated */
145	tcp_seq last_ack_sent;
146	/* RFC 1644 variables */
147	tcp_cc cc_send; /* send connection count */
148	tcp_cc cc_recv; /* receive connection count */
149	u_long t_duration; /* connection duration */
150
151	/* TUBA stuff */
152	caddr_t t_tuba_pcb; /* next level down pcb for TCP over z */
153	/* More RTT stuff */
154	u_long t_rttupdated; /* number of times rtt sampled */
155	};
156
157	/*
158	* Structure to hold TCP options that are only used during segment
159	* processing (in tcp_input), but not held in the tcpcb.
160	* It's basically used to reduce the number of parameters
161	* to tcp_dooptions.
162	*/
163	struct tcpopt {
164	u_long to_flags; /* which options are present */
165	#define TOF_TS 0x0001 /* timestamp */
166	#define TOF_CC 0x0002 /* CC and CCnew are exclusive */
167	#define TOF_CCNEW 0x0004
168	#define TOF_CCECHO 0x0008
169	#define TOF_MSS 0x0010
170	#define TOF_SCALE 0x0020
171	#define TOF_SIGNATURE 0x0040 /* signature option present */
172	#define TOF_SIGLEN 0x0080 /* signature length valid (RFC2385) */
173	#define TOF_SACK 0x0100 /* Peer sent SACK option */
174	u_int32_t to_tsval;
175	u_int32_t to_tsecr;
176	tcp_cc to_cc; /* holds CC or CCnew */
177	tcp_cc to_ccecho;
178	};
179
180	/*
181	* The TAO cache entry which is stored in the protocol family specific
182	* portion of the route metrics.
183	*/
184	struct rmxp_tao {
185	tcp_cc tao_cc; /* latest CC in valid SYN */
186	tcp_cc tao_ccsent; /* latest CC sent to peer */
187	u_short tao_mssopt; /* peer's cached MSS */
188	#ifdef notyet
189	u_short tao_flags; /* cache status flags */
190	#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */
191	#define TAOF_OK 0x0002 /* peer does understand rfc1644 */
192	#define TAOF_UNDEF 0 /* we don't know yet */
193	#endif /* notyet */
194	};
195	#define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler)
196
197	#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
198	#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
199	#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
200	#endif /* __BSD_VISIBLE */
201
202	/*
203	* The smoothed round-trip time and estimated variance
204	* are stored as fixed point numbers scaled by the values below.
205	* For convenience, these scales are also used in smoothing the average
206	* (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
207	* With these scales, srtt has 3 bits to the right of the binary point,
208	* and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
209	* binary point, and is smoothed with an ALPHA of 0.75.
210	*/
211	#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
212	#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
213	#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
214	#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
215	#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
216
217	/*
218	* The initial retransmission should happen at rtt + 4 * rttvar.
219	* Because of the way we do the smoothing, srtt and rttvar
220	* will each average +1/2 tick of bias. When we compute
221	* the retransmit timer, we want 1/2 tick of rounding and
222	* 1 extra tick because of +-1/2 tick uncertainty in the
223	* firing of the timer. The bias will give us exactly the
224	* 1.5 tick we need. But, because the bias is
225	* statistical, we have to test that we don't drop below
226	* the minimum feasible timer (which is 2 ticks).
227	* This version of the macro adapted from a paper by Lawrence
228	* Brakmo and Larry Peterson which outlines a problem caused
229	* by insufficient precision in the original implementation,
230	* which results in inappropriately large RTO values for very
231	* fast networks.
232	*/
233	#define TCP_REXMTVAL(tp) \
234	((((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
235	+ (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
236
237	/* XXX
238	* We want to avoid doing m_pullup on incoming packets but that
239	* means avoiding dtom on the tcp reassembly code. That in turn means
240	* keeping an mbuf pointer in the reassembly queue (since we might
241	* have a cluster). As a quick hack, the source & destination
242	* port numbers (which are no longer needed once we've located the
243	* tcpcb) are overlayed with an mbuf pointer.
244	*/
245	#if (defined(__GNUC__) && (defined(__arm__) \|\| defined(__mips__)))
246	#define STR32_UNALGN(ti,m) \
247	(ti)->ti_sport = (unsigned short)(((unsigned int) m & 0xffff0000) >> 16); \
248	(ti)->ti_dport = (unsigned short) ((unsigned int) m & 0x0000ffff);
249	#define LD32_UNALGN(ti,m) \
250	m = (struct mbuf *)((((unsigned int) (ti)->ti_sport) << 16) \| ( (unsigned int)(ti)->ti_dport));
251
252	#else
253	#define REASS_MBUF(ti) ((struct mbuf *)&((ti)->ti_t))
254	#endif
255
256	/*
257	* TCP statistics.
258	* Many of these should be kept per connection,
259	* but that's inconvenient at the moment.
260	*/
261	struct tcpstat {
262	u_long tcps_connattempt; /* connections initiated */
263	u_long tcps_accepts; /* connections accepted */
264	u_long tcps_connects; /* connections established */
265	u_long tcps_drops; /* connections dropped */
266	u_long tcps_conndrops; /* embryonic connections dropped */
267	u_long tcps_closed; /* conn. closed (includes drops) */
268	u_long tcps_segstimed; /* segs where we tried to get rtt */
269	u_long tcps_rttupdated; /* times we succeeded */
270	u_long tcps_delack; /* delayed acks sent */
271	u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
272	u_long tcps_rexmttimeo; /* retransmit timeouts */
273	u_long tcps_persisttimeo; /* persist timeouts */
274	u_long tcps_keeptimeo; /* keepalive timeouts */
275	u_long tcps_keepprobe; /* keepalive probes sent */
276	u_long tcps_keepdrops; /* connections dropped in keepalive */
277
278	u_long tcps_sndtotal; /* total packets sent */
279	u_long tcps_sndpack; /* data packets sent */
280	u_long tcps_sndbyte; /* data bytes sent */
281	u_long tcps_sndrexmitpack; /* data packets retransmitted */
282	u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
283	u_long tcps_sndacks; /* ack-only packets sent */
284	u_long tcps_sndprobe; /* window probes sent */
285	u_long tcps_sndurg; /* packets sent with URG only */
286	u_long tcps_sndwinup; /* window update-only packets sent */
287	u_long tcps_sndctrl; /* control (SYN\|FIN\|RST) packets sent */
288
289	u_long tcps_rcvtotal; /* total packets received */
290	u_long tcps_rcvpack; /* packets received in sequence */
291	u_long tcps_rcvbyte; /* bytes received in sequence */
292	u_long tcps_rcvbadsum; /* packets received with ccksum errs */
293	u_long tcps_rcvbadoff; /* packets received with bad offset */
294	u_long tcps_rcvshort; /* packets received too short */
295	u_long tcps_rcvduppack; /* duplicate-only packets received */
296	u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
297	u_long tcps_rcvpartduppack; /* packets with some duplicate data */
298	u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
299	u_long tcps_rcvoopack; /* out-of-order packets received */
300	u_long tcps_rcvoobyte; /* out-of-order bytes received */
301	u_long tcps_rcvpackafterwin; /* packets with data after window */
302	u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
303	u_long tcps_rcvafterclose; /* packets rcvd after "close" */
304	u_long tcps_rcvwinprobe; /* rcvd window probe packets */
305	u_long tcps_rcvdupack; /* rcvd duplicate acks */
306	u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
307	u_long tcps_rcvackpack; /* rcvd ack packets */
308	u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
309	u_long tcps_rcvwinupd; /* rcvd window update packets */
310	u_long tcps_pawsdrop; /* segments dropped due to PAWS */
311	u_long tcps_predack; /* times hdr predict ok for acks */
312	u_long tcps_preddat; /* times hdr predict ok for data pkts */
313	u_long tcps_pcbcachemiss;
314	u_long tcps_cachedrtt; /* times cached RTT in route updated */
315	u_long tcps_cachedrttvar; /* times cached rttvar updated */
316	u_long tcps_cachedssthresh; /* times cached ssthresh updated */
317	u_long tcps_usedrtt; /* times RTT initialized from route */
318	u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
319	u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
320	u_long tcps_persistdrop; /* timeout in persist state */
321	u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
322	u_long tcps_mturesent; /* resends due to MTU discovery */
323	u_long tcps_listendrop; /* listen queue overflows */
324	};
325
326	/*
327	* TCB structure exported to user-land via sysctl(3).
328	* Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
329	* included. Not all of our clients do.
330	*/
331	#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
332	struct xtcpcb {
333	size_t xt_len;
334	struct inpcb xt_inp;
335	struct tcpcb xt_tp;
336	#if 0
337	struct xsocket xt_socket;
338	u_quad_t xt_alignment_hack;
339	#endif
340	};
341	#endif
342
343	/*
344	* Names for TCP sysctl objects
345	*/
346	#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
347	#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */
348	#define TCPCTL_MSSDFLT 3 /* MSS default */
349	#define TCPCTL_STATS 4 /* statistics (read-only) */
350	#define TCPCTL_RTTDFLT 5 /* default RTT estimate */
351	#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
352	#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
353	#define TCPCTL_SENDSPACE 8 /* send buffer space */
354	#define TCPCTL_RECVSPACE 9 /* receive buffer space */
355	#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
356	#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
357	#define TCPCTL_MAXID 12
358
359	#define TCPCTL_NAMES { \
360	{ 0, 0 }, \
361	{ "rfc1323", CTLTYPE_INT }, \
362	{ "rfc1644", CTLTYPE_INT }, \
363	{ "mssdflt", CTLTYPE_INT }, \
364	{ "stats", CTLTYPE_STRUCT }, \
365	{ "rttdflt", CTLTYPE_INT }, \
366	{ "keepidle", CTLTYPE_INT }, \
367	{ "keepintvl", CTLTYPE_INT }, \
368	{ "sendspace", CTLTYPE_INT }, \
369	{ "recvspace", CTLTYPE_INT }, \
370	{ "keepinit", CTLTYPE_INT }, \
371	}
372
373	#ifdef _KERNEL
374	#ifdef SYSCTL_DECL
375	SYSCTL_DECL(_net_inet_tcp);
376	#endif
377
378	extern struct inpcbhead tcb; /* head of queue of active tcpcb's */
379	extern struct inpcbinfo tcbinfo;
380	extern struct tcpstat tcpstat; /* tcp statistics */
381	extern int tcp_mssdflt; /* XXX */
382	extern u_long tcp_now; /* for RFC 1323 timestamps */
383
384	void tcp_canceltimers(struct tcpcb *);
385	struct tcpcb *
386	tcp_close(struct tcpcb *);
387	void tcp_ctlinput(int, struct sockaddr , void );
388	int tcp_ctloutput(int, struct socket , int, int, struct mbuf *);
389	struct tcpcb *
390	tcp_drop(struct tcpcb *, int);
391	void tcp_drain(void);
392	void tcp_fasttimo(void);
393	struct rmxp_tao *
394	tcp_gettaocache(struct inpcb *);
395	void tcp_init(void);
396	void tcp_input(struct mbuf *, int);
397	void tcp_mss(struct tcpcb *, int);
398	int tcp_mssopt(struct tcpcb *);
399	void tcp_mtudisc(struct inpcb *, int);
400	struct tcpcb *
401	tcp_newtcpcb(struct inpcb *);
402	int tcp_output(struct tcpcb *);
403	void tcp_quench(struct inpcb *, int);
404	void tcp_respond(struct tcpcb *,
405	struct tcpiphdr , struct mbuf , tcp_seq, tcp_seq, int);
406	struct rtentry *
407	tcp_rtlookup(struct inpcb *);
408	void tcp_setpersist(struct tcpcb *);
409	void tcp_slowtimo(void);
410	struct tcpiphdr *
411	tcp_template(struct tcpcb *);
412	struct tcpcb *
413	tcp_timers(struct tcpcb *, int);
414	void tcp_trace(short, short, struct tcpcb , struct tcpiphdr , int);
415
416	extern struct pr_usrreqs tcp_usrreqs;
417	extern u_long tcp_sendspace;
418	extern u_long tcp_recvspace;
419
420	#endif /* _KERNEL */
421
422	#endif /* _NETINET_TCP_VAR_H_ */

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