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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1982, 1986 Regents of the University of California. | |
3 | * 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 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
38e82238 | 33 | * from: @(#)tcp_var.h 7.10 (Berkeley) 6/28/90 |
fde1aeb2 | 34 | * $Id: tcp_var.h,v 1.4 1993/11/25 01:35:21 wollman Exp $ |
15637ed4 RG |
35 | */ |
36 | ||
8ace4366 GW |
37 | #ifndef _NETINET_TCP_VAR_H_ |
38 | #define _NETINET_TCP_VAR_H_ 1 | |
39 | ||
15637ed4 RG |
40 | /* |
41 | * Kernel variables for tcp. | |
42 | */ | |
43 | ||
44 | /* | |
45 | * Tcp control block, one per tcp; fields: | |
46 | */ | |
47 | struct tcpcb { | |
48 | struct tcpiphdr *seg_next; /* sequencing queue */ | |
49 | struct tcpiphdr *seg_prev; | |
50 | short t_state; /* state of this connection */ | |
51 | short t_timer[TCPT_NTIMERS]; /* tcp timers */ | |
52 | short t_rxtshift; /* log(2) of rexmt exp. backoff */ | |
53 | short t_rxtcur; /* current retransmit value */ | |
54 | short t_dupacks; /* consecutive dup acks recd */ | |
55 | u_short t_maxseg; /* maximum segment size */ | |
56 | char t_force; /* 1 if forcing out a byte */ | |
57 | u_char t_flags; | |
58 | #define TF_ACKNOW 0x01 /* ack peer immediately */ | |
59 | #define TF_DELACK 0x02 /* ack, but try to delay it */ | |
60 | #define TF_NODELAY 0x04 /* don't delay packets to coalesce */ | |
61 | #define TF_NOOPT 0x08 /* don't use tcp options */ | |
62 | #define TF_SENTFIN 0x10 /* have sent FIN */ | |
63 | struct tcpiphdr *t_template; /* skeletal packet for transmit */ | |
64 | struct inpcb *t_inpcb; /* back pointer to internet pcb */ | |
65 | /* | |
66 | * The following fields are used as in the protocol specification. | |
67 | * See RFC783, Dec. 1981, page 21. | |
68 | */ | |
69 | /* send sequence variables */ | |
70 | tcp_seq snd_una; /* send unacknowledged */ | |
71 | tcp_seq snd_nxt; /* send next */ | |
72 | tcp_seq snd_up; /* send urgent pointer */ | |
73 | tcp_seq snd_wl1; /* window update seg seq number */ | |
74 | tcp_seq snd_wl2; /* window update seg ack number */ | |
75 | tcp_seq iss; /* initial send sequence number */ | |
76 | u_short snd_wnd; /* send window */ | |
77 | /* receive sequence variables */ | |
78 | u_short rcv_wnd; /* receive window */ | |
79 | tcp_seq rcv_nxt; /* receive next */ | |
80 | tcp_seq rcv_up; /* receive urgent pointer */ | |
81 | tcp_seq irs; /* initial receive sequence number */ | |
82 | /* | |
83 | * Additional variables for this implementation. | |
84 | */ | |
85 | /* receive variables */ | |
86 | tcp_seq rcv_adv; /* advertised window */ | |
87 | /* retransmit variables */ | |
88 | tcp_seq snd_max; /* highest sequence number sent; | |
89 | * used to recognize retransmits | |
90 | */ | |
91 | /* congestion control (for slow start, source quench, retransmit after loss) */ | |
92 | u_short snd_cwnd; /* congestion-controlled window */ | |
93 | u_short snd_ssthresh; /* snd_cwnd size threshhold for | |
94 | * for slow start exponential to | |
95 | * linear switch | |
96 | */ | |
97 | /* | |
98 | * transmit timing stuff. See below for scale of srtt and rttvar. | |
99 | * "Variance" is actually smoothed difference. | |
100 | */ | |
101 | short t_idle; /* inactivity time */ | |
102 | short t_rtt; /* round trip time */ | |
103 | tcp_seq t_rtseq; /* sequence number being timed */ | |
104 | short t_srtt; /* smoothed round-trip time */ | |
105 | short t_rttvar; /* variance in round-trip time */ | |
106 | u_short t_rttmin; /* minimum rtt allowed */ | |
107 | u_short max_sndwnd; /* largest window peer has offered */ | |
108 | ||
109 | /* out-of-band data */ | |
110 | char t_oobflags; /* have some */ | |
111 | char t_iobc; /* input character */ | |
112 | #define TCPOOB_HAVEDATA 0x01 | |
113 | #define TCPOOB_HADDATA 0x02 | |
114 | short t_softerror; /* possible error not yet reported */ | |
115 | }; | |
116 | ||
117 | #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) | |
118 | #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) | |
119 | ||
120 | /* | |
121 | * The smoothed round-trip time and estimated variance | |
122 | * are stored as fixed point numbers scaled by the values below. | |
123 | * For convenience, these scales are also used in smoothing the average | |
124 | * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). | |
125 | * With these scales, srtt has 3 bits to the right of the binary point, | |
126 | * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the | |
127 | * binary point, and is smoothed with an ALPHA of 0.75. | |
128 | */ | |
129 | #define TCP_RTT_SCALE 8 /* multiplier for srtt; 3 bits frac. */ | |
130 | #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */ | |
131 | #define TCP_RTTVAR_SCALE 4 /* multiplier for rttvar; 2 bits */ | |
132 | #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ | |
133 | ||
134 | /* | |
135 | * The initial retransmission should happen at rtt + 4 * rttvar. | |
136 | * Because of the way we do the smoothing, srtt and rttvar | |
137 | * will each average +1/2 tick of bias. When we compute | |
138 | * the retransmit timer, we want 1/2 tick of rounding and | |
139 | * 1 extra tick because of +-1/2 tick uncertainty in the | |
140 | * firing of the timer. The bias will give us exactly the | |
141 | * 1.5 tick we need. But, because the bias is | |
142 | * statistical, we have to test that we don't drop below | |
143 | * the minimum feasible timer (which is 2 ticks). | |
144 | * This macro assumes that the value of TCP_RTTVAR_SCALE | |
145 | * is the same as the multiplier for rttvar. | |
146 | */ | |
147 | #define TCP_REXMTVAL(tp) \ | |
148 | (((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) | |
149 | ||
150 | /* XXX | |
151 | * We want to avoid doing m_pullup on incoming packets but that | |
152 | * means avoiding dtom on the tcp reassembly code. That in turn means | |
153 | * keeping an mbuf pointer in the reassembly queue (since we might | |
154 | * have a cluster). As a quick hack, the source & destination | |
155 | * port numbers (which are no longer needed once we've located the | |
156 | * tcpcb) are overlayed with an mbuf pointer. | |
157 | */ | |
158 | #define REASS_MBUF(ti) (*(struct mbuf **)&((ti)->ti_t)) | |
159 | ||
160 | /* | |
161 | * TCP statistics. | |
162 | * Many of these should be kept per connection, | |
163 | * but that's inconvenient at the moment. | |
164 | */ | |
165 | struct tcpstat { | |
166 | u_long tcps_connattempt; /* connections initiated */ | |
167 | u_long tcps_accepts; /* connections accepted */ | |
168 | u_long tcps_connects; /* connections established */ | |
169 | u_long tcps_drops; /* connections dropped */ | |
170 | u_long tcps_conndrops; /* embryonic connections dropped */ | |
171 | u_long tcps_closed; /* conn. closed (includes drops) */ | |
172 | u_long tcps_segstimed; /* segs where we tried to get rtt */ | |
173 | u_long tcps_rttupdated; /* times we succeeded */ | |
174 | u_long tcps_delack; /* delayed acks sent */ | |
175 | u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ | |
176 | u_long tcps_rexmttimeo; /* retransmit timeouts */ | |
177 | u_long tcps_persisttimeo; /* persist timeouts */ | |
178 | u_long tcps_keeptimeo; /* keepalive timeouts */ | |
179 | u_long tcps_keepprobe; /* keepalive probes sent */ | |
180 | u_long tcps_keepdrops; /* connections dropped in keepalive */ | |
181 | ||
182 | u_long tcps_sndtotal; /* total packets sent */ | |
183 | u_long tcps_sndpack; /* data packets sent */ | |
184 | u_long tcps_sndbyte; /* data bytes sent */ | |
185 | u_long tcps_sndrexmitpack; /* data packets retransmitted */ | |
186 | u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ | |
187 | u_long tcps_sndacks; /* ack-only packets sent */ | |
188 | u_long tcps_sndprobe; /* window probes sent */ | |
189 | u_long tcps_sndurg; /* packets sent with URG only */ | |
190 | u_long tcps_sndwinup; /* window update-only packets sent */ | |
191 | u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ | |
192 | ||
193 | u_long tcps_rcvtotal; /* total packets received */ | |
194 | u_long tcps_rcvpack; /* packets received in sequence */ | |
195 | u_long tcps_rcvbyte; /* bytes received in sequence */ | |
196 | u_long tcps_rcvbadsum; /* packets received with ccksum errs */ | |
197 | u_long tcps_rcvbadoff; /* packets received with bad offset */ | |
198 | u_long tcps_rcvshort; /* packets received too short */ | |
199 | u_long tcps_rcvduppack; /* duplicate-only packets received */ | |
200 | u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ | |
201 | u_long tcps_rcvpartduppack; /* packets with some duplicate data */ | |
202 | u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ | |
203 | u_long tcps_rcvoopack; /* out-of-order packets received */ | |
204 | u_long tcps_rcvoobyte; /* out-of-order bytes received */ | |
205 | u_long tcps_rcvpackafterwin; /* packets with data after window */ | |
206 | u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ | |
207 | u_long tcps_rcvafterclose; /* packets rcvd after "close" */ | |
208 | u_long tcps_rcvwinprobe; /* rcvd window probe packets */ | |
209 | u_long tcps_rcvdupack; /* rcvd duplicate acks */ | |
210 | u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ | |
211 | u_long tcps_rcvackpack; /* rcvd ack packets */ | |
212 | u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ | |
213 | u_long tcps_rcvwinupd; /* rcvd window update packets */ | |
214 | }; | |
215 | ||
216 | #ifdef KERNEL | |
8ace4366 GW |
217 | extern struct inpcb tcb; /* head of queue of active tcpcb's */ |
218 | extern struct tcpstat tcpstat; /* tcp statistics */ | |
4c45483e | 219 | |
fde1aeb2 GW |
220 | /* From tcp_input.c: */ |
221 | extern int tcp_reass(struct tcpcb *, struct tcpiphdr *, struct mbuf *); | |
222 | extern void tcp_input(struct mbuf *, int); | |
223 | extern int tcp_mss(struct tcpcb *, int /*u_short*/); | |
4c45483e | 224 | |
fde1aeb2 GW |
225 | /* From tcp_output.c: */ |
226 | extern int tcp_output(struct tcpcb *); | |
227 | extern void tcp_setpersist(struct tcpcb *); | |
4c45483e | 228 | |
fde1aeb2 GW |
229 | /* From tcp_subr.c: */ |
230 | extern void tcp_init(void); | |
231 | extern struct tcpiphdr *tcp_template(struct tcpcb *); | |
232 | extern void tcp_respond(struct tcpcb *, struct tcpiphdr *, struct mbuf *, | |
233 | tcp_seq, tcp_seq, int); | |
234 | extern struct tcpcb *tcp_newtcpcb(struct inpcb *); | |
235 | extern struct tcpcb *tcp_drop(struct tcpcb *, int); | |
236 | extern struct tcpcb *tcp_close(struct tcpcb *); | |
237 | extern void tcp_drain(void); | |
238 | extern void tcp_notify(struct inpcb *, int); | |
239 | #ifdef MTUDISC | |
240 | extern void tcp_checkmtu(struct inpcb *, int); | |
241 | extern void tcp_mtuchanged(struct inpcb *, int); | |
15637ed4 | 242 | #endif |
fde1aeb2 GW |
243 | extern void tcp_ctlinput(int, struct sockaddr *, struct ip *); |
244 | extern void tcp_quench(struct inpcb *, int); | |
245 | ||
246 | /* From tcp_timer.c: */ | |
247 | extern void tcp_fasttimo(void); | |
248 | extern void tcp_slowtimo(void); | |
249 | extern void tcp_canceltimers(struct tcpcb *); | |
250 | extern struct tcpcb *tcp_timers(struct tcpcb *, int); | |
251 | ||
252 | /* From tcp_usrreq.c: */ | |
253 | extern int tcp_usrreq(struct socket *, int, struct mbuf *, struct mbuf *, | |
254 | struct mbuf *, struct mbuf *); | |
255 | extern int tcp_ctloutput(int, struct socket *, int, int, struct mbuf **); | |
256 | extern int tcp_attach(struct socket *); | |
257 | extern struct tcpcb *tcp_disconnect(struct tcpcb *); | |
258 | extern struct tcpcb *tcp_usrclosed(struct tcpcb *); | |
259 | ||
260 | extern struct inpcb *tcp_last_inpcb; | |
261 | ||
262 | /* From in_var.c: */ | |
263 | extern int tcp_ttl; | |
264 | extern int tcp_mssdflt; | |
265 | extern int tcp_rttdflt; | |
266 | extern int tcp_keepidle; | |
267 | extern int tcp_keepintvl; | |
268 | extern int tcp_maxidle; | |
269 | extern u_long tcp_sendspace; | |
270 | extern u_long tcp_recvspace; | |
271 | ||
272 | #endif /* KERNEL */ | |
8ace4366 | 273 | #endif /* _NETINET_TCP_VAR_H_ */ |