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51386eb2 KS |
1 | /* |
2 | * Copyright (c) University of British Columbia, 1984 | |
3 | * Copyright (c) 1990 The Regents of the University of California. | |
4 | * All rights reserved. | |
5 | * | |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * the Laboratory for Computation Vision and the Computer Science Department | |
8 | * of the University of British Columbia. | |
9 | * | |
10 | * %sccs.include.redist.c% | |
11 | * | |
ffababe5 | 12 | * @(#)pk_output.c 7.3 (Berkeley) %G% |
51386eb2 | 13 | */ |
0164bb81 KS |
14 | |
15 | #include "../h/param.h" | |
16 | #include "../h/systm.h" | |
17 | #include "../h/mbuf.h" | |
18 | #include "../h/socket.h" | |
19 | #include "../h/socketvar.h" | |
20 | #include "../h/protosw.h" | |
21 | #include "../h/errno.h" | |
22 | ||
23 | #include "../net/if.h" | |
24 | ||
25 | #include "../netccitt/pk.h" | |
26 | #include "../netccitt/pk_var.h" | |
27 | #include "../netccitt/x25.h" | |
28 | ||
29 | struct mbuf *nextpk (); | |
30 | ||
31 | pk_output (lcp) | |
32 | register struct pklcd *lcp; | |
33 | { | |
34 | register struct x25_packet *xp; | |
35 | register struct mbuf *m; | |
36 | register struct pkcb *pkp = lcp -> lcd_pkp; | |
37 | ||
38 | if (lcp == 0 || pkp == 0) { | |
39 | printf ("pk_output: zero arg\n"); | |
40 | return; | |
41 | } | |
42 | ||
43 | while ((m = nextpk (lcp)) != NULL) { | |
44 | xp = mtod (m, struct x25_packet *); | |
45 | ||
46 | switch (pk_decode (xp) + lcp -> lcd_state) { | |
47 | /* | |
48 | * All the work is already done - just set the state and | |
49 | * pass to peer. | |
50 | */ | |
51 | case CALL + READY: | |
52 | lcp -> lcd_state = SENT_CALL; | |
53 | lcp -> lcd_timer = pk_t21; | |
54 | break; | |
55 | ||
56 | /* | |
57 | * Just set the state to allow packet to flow and send the | |
58 | * confirmation. | |
59 | */ | |
60 | case CALL_ACCEPTED + RECEIVED_CALL: | |
61 | lcp -> lcd_state = DATA_TRANSFER; | |
62 | break; | |
63 | ||
64 | /* | |
65 | * Just set the state. Keep the LCD around till the clear | |
66 | * confirmation is returned. | |
67 | */ | |
68 | case CLEAR + RECEIVED_CALL: | |
69 | case CLEAR + SENT_CALL: | |
70 | case CLEAR + DATA_TRANSFER: | |
71 | lcp -> lcd_state = SENT_CLEAR; | |
72 | lcp -> lcd_retry = 0; | |
73 | /* fall through */ | |
74 | ||
75 | case CLEAR + SENT_CLEAR: | |
76 | lcp -> lcd_timer = pk_t23; | |
77 | lcp -> lcd_retry++; | |
78 | break; | |
79 | ||
80 | case CLEAR_CONF + RECEIVED_CLEAR: | |
81 | case CLEAR_CONF + SENT_CLEAR: | |
82 | case CLEAR_CONF + READY: | |
83 | lcp -> lcd_state = READY; | |
84 | break; | |
85 | ||
86 | case DATA + DATA_TRANSFER: | |
87 | PS(xp) = lcp -> lcd_ssn; | |
88 | PR(xp) = lcp -> lcd_input_window; | |
89 | lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window; | |
90 | lcp -> lcd_ssn = (lcp -> lcd_ssn + 1) % MODULUS; | |
91 | if (lcp -> lcd_ssn == ((lcp -> lcd_output_window + pkp->pk_xcp->xc_pwsize) % MODULUS)) | |
92 | lcp -> lcd_window_condition = TRUE; | |
93 | break; | |
94 | ||
95 | case INTERRUPT + DATA_TRANSFER: | |
96 | xp -> packet_data = 0; | |
97 | lcp -> lcd_intrconf_pending = TRUE; | |
98 | break; | |
99 | ||
100 | case INTERRUPT_CONF + DATA_TRANSFER: | |
101 | break; | |
102 | ||
103 | case RR + DATA_TRANSFER: | |
104 | lcp -> lcd_input_window = (lcp -> lcd_input_window + 1) % MODULUS; | |
105 | PR(xp) = lcp -> lcd_input_window; | |
106 | lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window; | |
107 | break; | |
108 | ||
109 | case RNR + DATA_TRANSFER: | |
110 | PR(xp) = lcp -> lcd_input_window; | |
111 | lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window; | |
112 | break; | |
113 | ||
114 | case RESET + DATA_TRANSFER: | |
115 | lcp -> lcd_reset_condition = TRUE; | |
116 | break; | |
117 | ||
118 | case RESET_CONF + DATA_TRANSFER: | |
119 | lcp -> lcd_reset_condition = FALSE; | |
120 | break; | |
121 | ||
122 | /* | |
123 | * A restart should be only generated internally. Therefore | |
124 | * all logic for restart is in the pk_restart routine. | |
125 | */ | |
126 | case RESTART + READY: | |
127 | lcp -> lcd_timer = pk_t20; | |
128 | break; | |
129 | ||
130 | /* | |
131 | * Restarts are all handled internally. Therefore all the | |
132 | * logic for the incoming restart packet is handled in the | |
133 | * pk_input routine. | |
134 | */ | |
135 | case RESTART_CONF + READY: | |
136 | break; | |
137 | ||
138 | default: | |
139 | m_freem (m); | |
140 | return; | |
141 | } | |
142 | ||
143 | /* Trace the packet. */ | |
144 | pk_trace (pkp -> pk_xcp, xp, "P-Out"); | |
145 | ||
146 | /* Pass the packet on down to the link layer */ | |
ffababe5 | 147 | (*pkp -> pk_lloutput) (m, pkp -> pk_xcp); |
0164bb81 KS |
148 | } |
149 | } | |
150 | ||
151 | /* | |
152 | * This procedure returns the next packet to send or null. A | |
153 | * packet is composed of one or more mbufs. | |
154 | */ | |
155 | ||
156 | struct mbuf * | |
157 | nextpk (lcp) | |
158 | struct pklcd *lcp; | |
159 | { | |
160 | register struct socket *so = lcp -> lcd_so; | |
161 | register struct mbuf *m = 0, *n; | |
162 | ||
163 | if (lcp -> lcd_template) { | |
164 | m = dtom (lcp -> lcd_template); | |
165 | lcp -> lcd_template = NULL; | |
166 | } else { | |
167 | if (lcp -> lcd_rnr_condition || lcp -> lcd_window_condition || | |
168 | lcp -> lcd_reset_condition) | |
169 | return (NULL); | |
170 | ||
ffababe5 KS |
171 | if (so == 0) { |
172 | if ((m = lcp->lcd_downq.pq_data) == 0) | |
173 | return (NULL); | |
174 | lcp->lcd_downq.pq_data = m->m_nextpkt; | |
175 | lcp->lcd_downq.pq_space += m->m_pkthdr.len; | |
176 | m->m_nextpkt = 0; | |
177 | return (m); | |
178 | } | |
0164bb81 KS |
179 | |
180 | if ((m = so -> so_snd.sb_mb) == 0) | |
181 | return (NULL); | |
182 | ||
183 | n = m; | |
184 | while (n) { | |
185 | sbfree (&so -> so_snd, n); | |
0164bb81 KS |
186 | n = n -> m_next; |
187 | } | |
188 | ||
0164bb81 KS |
189 | so->so_snd.sb_mb = m->m_act; |
190 | m->m_act = 0; | |
0164bb81 KS |
191 | } |
192 | ||
193 | return (m); | |
194 | } |