Commit | Line | Data |
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d977a479 | 1 | /* tcp_timer.c 4.15 82/02/25 */ |
f03530e6 BJ |
2 | |
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
5 | #include "../h/mbuf.h" | |
6 | #include "../h/socket.h" | |
7 | #include "../h/socketvar.h" | |
8 | #include "../h/protosw.h" | |
0974b45c BJ |
9 | #include "../net/in.h" |
10 | #include "../net/in_pcb.h" | |
11 | #include "../net/in_systm.h" | |
f03530e6 | 12 | #include "../net/if.h" |
f03530e6 BJ |
13 | #include "../net/ip.h" |
14 | #include "../net/ip_var.h" | |
15 | #include "../net/tcp.h" | |
16 | #include "../net/tcp_fsm.h" | |
0974b45c BJ |
17 | #include "../net/tcp_seq.h" |
18 | #include "../net/tcp_timer.h" | |
f03530e6 | 19 | #include "../net/tcp_var.h" |
0974b45c | 20 | #include "../net/tcpip.h" |
f1b2fa5b | 21 | #include "../errno.h" |
f03530e6 | 22 | |
8b5a83bb | 23 | int tcpnodelack = 0; |
f03530e6 BJ |
24 | /* |
25 | * Fast timeout routine for processing delayed acks | |
26 | */ | |
27 | tcp_fasttimo() | |
28 | { | |
b8b9174f BJ |
29 | register struct inpcb *inp; |
30 | register struct tcpcb *tp; | |
31 | int s = splnet(); | |
0974b45c | 32 | COUNT(TCP_FASTTIMO); |
b8b9174f | 33 | |
fd5dc5f0 BJ |
34 | inp = tcb.inp_next; |
35 | if (inp) | |
36 | for (; inp != &tcb; inp = inp->inp_next) | |
b8b9174f BJ |
37 | if ((tp = (struct tcpcb *)inp->inp_ppcb) && |
38 | (tp->t_flags & TF_DELACK)) { | |
39 | tp->t_flags &= ~TF_DELACK; | |
40 | tp->t_flags |= TF_ACKNOW; | |
41 | (void) tcp_output(tp); | |
42 | } | |
43 | splx(s); | |
f03530e6 BJ |
44 | } |
45 | ||
46 | /* | |
47 | * Tcp protocol timeout routine called every 500 ms. | |
48 | * Updates the timers in all active tcb's and | |
49 | * causes finite state machine actions if timers expire. | |
50 | */ | |
51 | tcp_slowtimo() | |
52 | { | |
53 | register struct inpcb *ip; | |
54 | register struct tcpcb *tp; | |
55 | int s = splnet(); | |
f03530e6 | 56 | register int i; |
0974b45c | 57 | COUNT(TCP_SLOWTIMO); |
f03530e6 BJ |
58 | |
59 | /* | |
60 | * Search through tcb's and update active timers. | |
61 | */ | |
4aed14e3 BJ |
62 | ip = tcb.inp_next; |
63 | if (ip == 0) { | |
64 | splx(s); | |
65 | return; | |
66 | } | |
67 | for (; ip != &tcb; ip = ip->inp_next) { | |
f03530e6 | 68 | tp = intotcpcb(ip); |
37de812c BJ |
69 | if (tp == 0) |
70 | continue; | |
a6503abf | 71 | for (i = 0; i < TCPT_NTIMERS; i++) { |
0974b45c | 72 | if (tp->t_timer[i] && --tp->t_timer[i] == 0) |
f03530e6 BJ |
73 | (void) tcp_usrreq(tp->t_inpcb->inp_socket, |
74 | PRU_SLOWTIMO, (struct mbuf *)0, | |
75 | (caddr_t)i); | |
f03530e6 | 76 | } |
405c9168 BJ |
77 | tp->t_idle++; |
78 | if (tp->t_rtt) | |
79 | tp->t_rtt++; | |
f03530e6 | 80 | } |
a6503abf | 81 | tcp_iss += TCP_ISSINCR/PR_SLOWHZ; /* increment iss */ |
f03530e6 BJ |
82 | splx(s); |
83 | } | |
84 | ||
85 | /* | |
a6503abf | 86 | * Cancel all timers for TCP tp. |
f03530e6 | 87 | */ |
0974b45c | 88 | tcp_canceltimers(tp) |
f03530e6 BJ |
89 | struct tcpcb *tp; |
90 | { | |
f03530e6 BJ |
91 | register int i; |
92 | ||
0974b45c | 93 | COUNT(TCP_CANCELTIMERS); |
a6503abf BJ |
94 | for (i = 0; i < TCPT_NTIMERS; i++) |
95 | tp->t_timer[i] = 0; | |
f03530e6 BJ |
96 | } |
97 | ||
d977a479 | 98 | int tcprexmtprint; |
f03530e6 | 99 | /* |
405c9168 | 100 | * TCP timer processing. |
f03530e6 | 101 | */ |
a6503abf | 102 | tcp_timers(tp, timer) |
f03530e6 | 103 | register struct tcpcb *tp; |
a6503abf | 104 | int timer; |
f03530e6 BJ |
105 | { |
106 | ||
107 | COUNT(TCP_TIMERS); | |
0974b45c | 108 | switch (timer) { |
f03530e6 | 109 | |
405c9168 BJ |
110 | /* |
111 | * 2 MSL timeout in shutdown went off. Delete connection | |
112 | * control block. | |
113 | */ | |
a6503abf BJ |
114 | case TCPT_2MSL: |
115 | tcp_close(tp); | |
116 | return; | |
f03530e6 | 117 | |
405c9168 BJ |
118 | /* |
119 | * Retransmission timer went off. Message has not | |
120 | * been acked within retransmit interval. Back off | |
121 | * to a longer retransmit interval and retransmit all | |
122 | * unacknowledged messages in the window. | |
123 | */ | |
a6503abf | 124 | case TCPT_REXMT: |
405c9168 | 125 | tp->t_rxtshift++; |
fd5dc5f0 BJ |
126 | if (tp->t_rxtshift > TCP_MAXRXTSHIFT) { |
127 | tcp_drop(tp, ETIMEDOUT); | |
128 | return; | |
129 | } | |
405c9168 | 130 | TCPT_RANGESET(tp->t_timer[TCPT_REXMT], |
d977a479 | 131 | (int)tp->t_srtt, TCPTV_MIN, TCPTV_MAX); |
b8b9174f BJ |
132 | TCPT_RANGESET(tp->t_timer[TCPT_REXMT], |
133 | tp->t_timer[TCPT_REXMT] << tp->t_rxtshift, | |
134 | TCPTV_MIN, TCPTV_MAX); | |
d977a479 BJ |
135 | if (tcprexmtprint) |
136 | printf("rexmt set to %d\n", tp->t_timer[TCPT_REXMT]); | |
405c9168 BJ |
137 | tp->snd_nxt = tp->snd_una; |
138 | /* this only transmits one segment! */ | |
139 | (void) tcp_output(tp); | |
a6503abf | 140 | return; |
f03530e6 | 141 | |
405c9168 BJ |
142 | /* |
143 | * Persistance timer into zero window. | |
144 | * Force a byte to be output, if possible. | |
145 | */ | |
a6503abf | 146 | case TCPT_PERSIST: |
405c9168 BJ |
147 | tp->t_force = 1; |
148 | (void) tcp_output(tp); | |
149 | tp->t_force = 0; | |
150 | TCPT_RANGESET(tp->t_timer[TCPT_PERSIST], | |
d977a479 | 151 | tcp_beta * tp->t_srtt, TCPTV_PERSMIN, TCPTV_MAX); |
0974b45c | 152 | return; |
f03530e6 | 153 | |
405c9168 BJ |
154 | /* |
155 | * Keep-alive timer went off; send something | |
156 | * or drop connection if idle for too long. | |
157 | */ | |
a6503abf | 158 | case TCPT_KEEP: |
405c9168 BJ |
159 | if (tp->t_state < TCPS_ESTABLISHED || |
160 | tp->t_idle >= TCPTV_MAXIDLE) { | |
161 | tcp_drop(tp, ETIMEDOUT); | |
162 | return; | |
163 | } | |
8e65fd66 BJ |
164 | if (tp->t_inpcb->inp_socket->so_options & SO_NOKEEPALIVE) |
165 | tp->t_idle = 0; | |
166 | else | |
167 | tcp_respond(tp, | |
168 | tp->t_template, tp->rcv_nxt, tp->snd_una-1, 0); | |
405c9168 | 169 | tp->t_timer[TCPT_KEEP] = TCPTV_KEEP; |
a6503abf | 170 | return; |
8b5a83bb BJ |
171 | |
172 | #ifdef TCPTRUEOOB | |
173 | /* | |
174 | * Out-of-band data retransmit timer. | |
175 | */ | |
176 | case TCPT_OOBREXMT: | |
177 | if (tp->t_flags & TF_NOOPT) | |
178 | return; | |
179 | (void) tcp_output(tp); | |
180 | TCPT_RANGESET(tp->t_timer[TCPT_OOBREXMT], | |
181 | 2 * tp->t_srtt, TCPTV_MIN, TCPTV_MAX); | |
182 | return; | |
183 | #endif | |
f03530e6 | 184 | } |
f03530e6 | 185 | } |