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1.1 root 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 are permitted
6: * provided that the above copyright notice and this paragraph are
7: * duplicated in all such forms and that any documentation,
8: * advertising materials, and other materials related to such
9: * distribution and use acknowledge that the software was developed
10: * by the University of California, Berkeley. The name of the
11: * University may not be used to endorse or promote products derived
12: * from this software without specific prior written permission.
13: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15: * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16: *
17: * @(#)tcp_var.h 7.8 (Berkeley) 6/29/88
18: */
19:
20: /*
21: * TCP configuration: This is a half-assed attempt to make TCP
22: * self-configure for a few varieties of 4.2 and 4.3-based unixes.
23: * If you don't have a) a 4.3bsd vax or b) a 3.x Sun (x<6), check
24: * this carefully (it's probably not right). Please send me mail
25: * if you run into configuration problems.
26: * - Van Jacobson ([email protected])
27: */
28:
29: #ifndef BSD
30: #define BSD 42 /* if we're not 4.3, pretend we're 4.2 */
31: #define OLDSTAT /* set if we have to use old netstat binaries */
32: #endif
33:
34: /* #define OLDSTAT /* set if we have to use old netstat binaries */
35:
36: #if sun || BSD < 43
37: #define TCP_COMPAT_42 /* set if we have to interop w/4.2 systems */
38: #endif
39:
40: #ifndef SB_MAX
41: #ifdef SB_MAXCOUNT
42: #define SB_MAX SB_MAXCOUNT /* Sun has to be a little bit different... */
43: #else
44: #define SB_MAX 32767 /* XXX */
45: #endif SB_MAXCOUNT
46: #endif SB_MAX
47:
48: #ifndef IP_MAXPACKET
49: #define IP_MAXPACKET 65535 /* maximum packet size */
50: #endif
51:
52: /*
53: * Bill Nowicki pointed out that the page size (CLBYTES) has
54: * nothing to do with the mbuf cluster size. So, we followed
55: * Sun's lead and made the new define MCLBYTES stand for the mbuf
56: * cluster size. The following define makes up backwards compatible
57: * with 4.3 and 4.2. If CLBYTES is >1024 on your machine, check
58: * this against the mbuf cluster definitions in /usr/include/sys/mbuf.h.
59: */
60: #ifndef MCLBYTES
61: #define MCLBYTES CLBYTES /* XXX */
62: #endif
63:
64: /*
65: * The routine in_localaddr is broken in Sun's 3.4. We redefine ours
66: * (in tcp_input.c) so we use can it but won't have a name conflict.
67: */
68: #ifdef sun
69: #define in_localaddr tcp_in_localaddr
70: #endif
71:
72: /* --------------- end of TCP config ---------------- */
73:
74: /*
75: * Kernel variables for tcp.
76: */
77:
78: /*
79: * Tcp control block, one per tcp; fields:
80: */
81: struct tcpcb {
82: struct tcpiphdr *seg_next; /* sequencing queue */
83: struct tcpiphdr *seg_prev;
84: short t_state; /* state of this connection */
85: short t_timer[TCPT_NTIMERS]; /* tcp timers */
86: short t_rxtshift; /* log(2) of rexmt exp. backoff */
87: short t_rxtcur; /* current retransmit value */
88: short t_dupacks; /* consecutive dup acks recd */
89: u_short t_maxseg; /* maximum segment size */
90: char t_force; /* 1 if forcing out a byte */
91: u_char t_flags;
92: #define TF_ACKNOW 0x01 /* ack peer immediately */
93: #define TF_DELACK 0x02 /* ack, but try to delay it */
94: #define TF_NODELAY 0x04 /* don't delay packets to coalesce */
95: #define TF_NOOPT 0x08 /* don't use tcp options */
96: #define TF_SENTFIN 0x10 /* have sent FIN */
97: struct tcpiphdr *t_template; /* skeletal packet for transmit */
98: struct inpcb *t_inpcb; /* back pointer to internet pcb */
99: /*
100: * The following fields are used as in the protocol specification.
101: * See RFC783, Dec. 1981, page 21.
102: */
103: /* send sequence variables */
104: tcp_seq snd_una; /* send unacknowledged */
105: tcp_seq snd_nxt; /* send next */
106: tcp_seq snd_up; /* send urgent pointer */
107: tcp_seq snd_wl1; /* window update seg seq number */
108: tcp_seq snd_wl2; /* window update seg ack number */
109: tcp_seq iss; /* initial send sequence number */
110: u_short snd_wnd; /* send window */
111: /* receive sequence variables */
112: u_short rcv_wnd; /* receive window */
113: tcp_seq rcv_nxt; /* receive next */
114: tcp_seq rcv_up; /* receive urgent pointer */
115: tcp_seq irs; /* initial receive sequence number */
116: /*
117: * Additional variables for this implementation.
118: */
119: /* receive variables */
120: tcp_seq rcv_adv; /* advertised window */
121: /* retransmit variables */
122: tcp_seq snd_max; /* highest sequence number sent
123: * used to recognize retransmits
124: */
125: /* congestion control (for slow start, source quench, retransmit after loss) */
126: u_short snd_cwnd; /* congestion-controlled window */
127: u_short snd_ssthresh; /* snd_cwnd size threshhold for
128: * for slow start exponential to
129: * linear switch */
130: /*
131: * transmit timing stuff.
132: * srtt and rttvar are stored as fixed point; for convenience in smoothing,
133: * srtt has 3 bits to the right of the binary point, rttvar has 2.
134: * "Variance" is actually smoothed difference.
135: */
136: short t_idle; /* inactivity time */
137: short t_rtt; /* round trip time */
138: tcp_seq t_rtseq; /* sequence number being timed */
139: short t_srtt; /* smoothed round-trip time */
140: short t_rttvar; /* variance in round-trip time */
141: u_short max_rcvd; /* most peer has sent into window */
142: u_short max_sndwnd; /* largest window peer has offered */
143: /* out-of-band data */
144: char t_oobflags; /* have some */
145: char t_iobc; /* input character */
146: #define TCPOOB_HAVEDATA 0x01
147: #define TCPOOB_HADDATA 0x02
148: };
149:
150: #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
151: #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
152:
153: /*
154: * TCP statistics.
155: * Many of these should be kept per connection,
156: * but that's inconvenient at the moment.
157: */
158: struct tcpstat {
159: #ifdef OLDSTAT
160: /*
161: * Declare statistics the same as in 4.3
162: * at the start of tcpstat (same size and
163: * position) for netstat.
164: */
165: int tcps_rcvbadsum;
166: int tcps_rcvbadoff;
167: int tcps_rcvshort;
168: int tcps_badsegs;
169: int tcps_unack;
170: #define tcps_badsum tcps_rcvbadsum
171: #define tcps_badoff tcps_rcvbadoff
172: #define tcps_hdrops tcps_rcvshort
173:
174: #endif OLDSTAT
175: u_long tcps_connattempt; /* connections initiated */
176: u_long tcps_accepts; /* connections accepted */
177: u_long tcps_connects; /* connections established */
178: u_long tcps_drops; /* connections dropped */
179: u_long tcps_conndrops; /* embryonic connections dropped */
180: u_long tcps_closed; /* conn. closed (includes drops) */
181: u_long tcps_segstimed; /* segs where we tried to get rtt */
182: u_long tcps_rttupdated; /* times we succeeded */
183: u_long tcps_delack; /* delayed acks sent */
184: u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
185: u_long tcps_rexmttimeo; /* retransmit timeouts */
186: u_long tcps_persisttimeo; /* persist timeouts */
187: u_long tcps_keeptimeo; /* keepalive timeouts */
188: u_long tcps_keepprobe; /* keepalive probes sent */
189: u_long tcps_keepdrops; /* connections dropped in keepalive */
190:
191: u_long tcps_sndtotal; /* total packets sent */
192: u_long tcps_sndpack; /* data packets sent */
193: u_long tcps_sndbyte; /* data bytes sent */
194: u_long tcps_sndrexmitpack; /* data packets retransmitted */
195: u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
196: u_long tcps_sndacks; /* ack-only packets sent */
197: u_long tcps_sndprobe; /* window probes sent */
198: u_long tcps_sndurg; /* packets sent with URG only */
199: u_long tcps_sndwinup; /* window update-only packets sent */
200: u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
201:
202: u_long tcps_rcvtotal; /* total packets received */
203: u_long tcps_rcvpack; /* packets received in sequence */
204: u_long tcps_rcvbyte; /* bytes received in sequence */
205: #ifndef OLDSTAT
206: u_long tcps_rcvbadsum; /* packets received with ccksum errs */
207: u_long tcps_rcvbadoff; /* packets received with bad offset */
208: u_long tcps_rcvshort; /* packets received too short */
209: #endif
210: u_long tcps_rcvduppack; /* duplicate-only packets received */
211: u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
212: u_long tcps_rcvpartduppack; /* packets with some duplicate data */
213: u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
214: u_long tcps_rcvoopack; /* out-of-order packets received */
215: u_long tcps_rcvoobyte; /* out-of-order bytes received */
216: u_long tcps_rcvpackafterwin; /* packets with data after window */
217: u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
218: u_long tcps_rcvafterclose; /* packets rcvd after "close" */
219: u_long tcps_rcvwinprobe; /* rcvd window probe packets */
220: u_long tcps_rcvdupack; /* rcvd duplicate acks */
221: u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
222: u_long tcps_rcvackpack; /* rcvd ack packets */
223: u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
224: u_long tcps_rcvwinupd; /* rcvd window update packets */
225: };
226:
227: #ifdef KERNEL
228: struct inpcb tcb; /* head of queue of active tcpcb's */
229: struct tcpstat tcpstat; /* tcp statistics */
230: struct tcpiphdr *tcp_template();
231: struct tcpcb *tcp_close(), *tcp_drop();
232: struct tcpcb *tcp_timers(), *tcp_disconnect(), *tcp_usrclosed();
233: #endif
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