Commit | Line | Data |
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b8b9174f | 1 | /* tcp_timer.c 4.10 81/12/21 */ |
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 | |
b8b9174f | 23 | int tcpdelack = 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 BJ |
33 | |
34 | for (inp = tcb.inp_next; inp != &tcb; inp = inp->inp_next) | |
35 | if ((tp = (struct tcpcb *)inp->inp_ppcb) && | |
36 | (tp->t_flags & TF_DELACK)) { | |
37 | tp->t_flags &= ~TF_DELACK; | |
38 | tp->t_flags |= TF_ACKNOW; | |
39 | (void) tcp_output(tp); | |
40 | } | |
41 | splx(s); | |
f03530e6 BJ |
42 | } |
43 | ||
44 | /* | |
45 | * Tcp protocol timeout routine called every 500 ms. | |
46 | * Updates the timers in all active tcb's and | |
47 | * causes finite state machine actions if timers expire. | |
48 | */ | |
49 | tcp_slowtimo() | |
50 | { | |
51 | register struct inpcb *ip; | |
52 | register struct tcpcb *tp; | |
53 | int s = splnet(); | |
f03530e6 | 54 | register int i; |
0974b45c | 55 | COUNT(TCP_SLOWTIMO); |
f03530e6 BJ |
56 | |
57 | /* | |
58 | * Search through tcb's and update active timers. | |
59 | */ | |
4aed14e3 BJ |
60 | ip = tcb.inp_next; |
61 | if (ip == 0) { | |
62 | splx(s); | |
63 | return; | |
64 | } | |
65 | for (; ip != &tcb; ip = ip->inp_next) { | |
f03530e6 | 66 | tp = intotcpcb(ip); |
37de812c BJ |
67 | if (tp == 0) |
68 | continue; | |
a6503abf | 69 | for (i = 0; i < TCPT_NTIMERS; i++) { |
0974b45c | 70 | if (tp->t_timer[i] && --tp->t_timer[i] == 0) |
f03530e6 BJ |
71 | (void) tcp_usrreq(tp->t_inpcb->inp_socket, |
72 | PRU_SLOWTIMO, (struct mbuf *)0, | |
73 | (caddr_t)i); | |
f03530e6 | 74 | } |
405c9168 BJ |
75 | tp->t_idle++; |
76 | if (tp->t_rtt) | |
77 | tp->t_rtt++; | |
f03530e6 | 78 | } |
a6503abf | 79 | tcp_iss += TCP_ISSINCR/PR_SLOWHZ; /* increment iss */ |
f03530e6 BJ |
80 | splx(s); |
81 | } | |
82 | ||
83 | /* | |
a6503abf | 84 | * Cancel all timers for TCP tp. |
f03530e6 | 85 | */ |
0974b45c | 86 | tcp_canceltimers(tp) |
f03530e6 BJ |
87 | struct tcpcb *tp; |
88 | { | |
f03530e6 BJ |
89 | register int i; |
90 | ||
0974b45c | 91 | COUNT(TCP_CANCELTIMERS); |
a6503abf BJ |
92 | for (i = 0; i < TCPT_NTIMERS; i++) |
93 | tp->t_timer[i] = 0; | |
f03530e6 BJ |
94 | } |
95 | ||
96 | /* | |
405c9168 | 97 | * TCP timer processing. |
f03530e6 | 98 | */ |
a6503abf | 99 | tcp_timers(tp, timer) |
f03530e6 | 100 | register struct tcpcb *tp; |
a6503abf | 101 | int timer; |
f03530e6 BJ |
102 | { |
103 | ||
104 | COUNT(TCP_TIMERS); | |
0974b45c | 105 | switch (timer) { |
f03530e6 | 106 | |
405c9168 BJ |
107 | /* |
108 | * 2 MSL timeout in shutdown went off. Delete connection | |
109 | * control block. | |
110 | */ | |
a6503abf BJ |
111 | case TCPT_2MSL: |
112 | tcp_close(tp); | |
113 | return; | |
f03530e6 | 114 | |
405c9168 BJ |
115 | /* |
116 | * Retransmission timer went off. Message has not | |
117 | * been acked within retransmit interval. Back off | |
118 | * to a longer retransmit interval and retransmit all | |
119 | * unacknowledged messages in the window. | |
120 | */ | |
a6503abf | 121 | case TCPT_REXMT: |
405c9168 BJ |
122 | tp->t_rxtshift++; |
123 | TCPT_RANGESET(tp->t_timer[TCPT_REXMT], | |
b8b9174f | 124 | ((int)(2 * tp->t_srtt)), |
405c9168 | 125 | TCPTV_MIN, TCPTV_MAX); |
b8b9174f BJ |
126 | TCPT_RANGESET(tp->t_timer[TCPT_REXMT], |
127 | tp->t_timer[TCPT_REXMT] << tp->t_rxtshift, | |
128 | TCPTV_MIN, TCPTV_MAX); | |
129 | if (tp->t_timer[TCPT_REXMT] > TCPTV_MAXIDLE / 2) { | |
130 | tcp_drop(tp, ETIMEDOUT); | |
131 | return; | |
132 | } | |
89413846 | 133 | printf("rexmt set to %d\n", tp->t_timer[TCPT_REXMT]); |
405c9168 BJ |
134 | tp->snd_nxt = tp->snd_una; |
135 | /* this only transmits one segment! */ | |
136 | (void) tcp_output(tp); | |
a6503abf | 137 | return; |
f03530e6 | 138 | |
405c9168 BJ |
139 | /* |
140 | * Persistance timer into zero window. | |
141 | * Force a byte to be output, if possible. | |
142 | */ | |
a6503abf | 143 | case TCPT_PERSIST: |
405c9168 BJ |
144 | tp->t_force = 1; |
145 | (void) tcp_output(tp); | |
146 | tp->t_force = 0; | |
147 | TCPT_RANGESET(tp->t_timer[TCPT_PERSIST], | |
148 | 2 * tp->t_srtt, TCPTV_PERSMIN, TCPTV_MAX); | |
0974b45c | 149 | return; |
f03530e6 | 150 | |
405c9168 BJ |
151 | /* |
152 | * Keep-alive timer went off; send something | |
153 | * or drop connection if idle for too long. | |
154 | */ | |
a6503abf | 155 | case TCPT_KEEP: |
405c9168 BJ |
156 | if (tp->t_state < TCPS_ESTABLISHED || |
157 | tp->t_idle >= TCPTV_MAXIDLE) { | |
158 | tcp_drop(tp, ETIMEDOUT); | |
159 | return; | |
160 | } | |
161 | tcp_respond(tp->t_template, tp->rcv_nxt, tp->snd_una-1, 0); | |
162 | tp->t_timer[TCPT_KEEP] = TCPTV_KEEP; | |
a6503abf | 163 | return; |
f03530e6 | 164 | } |
f03530e6 | 165 | } |