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0164bb81 KS |
1 | /* Copyright (c) University of British Columbia, 1984 */ |
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" | |
9 | #include "../h/errno.h" | |
10 | ||
11 | #include "../net/if.h" | |
12 | ||
13 | #include "../netccitt/pk.h" | |
14 | #include "../netccitt/pk_var.h" | |
15 | #include "../netccitt/x25.h" | |
16 | ||
17 | struct mbuf *nextpk (); | |
18 | ||
19 | pk_output (lcp) | |
20 | register struct pklcd *lcp; | |
21 | { | |
22 | register struct x25_packet *xp; | |
23 | register struct mbuf *m; | |
24 | register struct pkcb *pkp = lcp -> lcd_pkp; | |
25 | ||
26 | if (lcp == 0 || pkp == 0) { | |
27 | printf ("pk_output: zero arg\n"); | |
28 | return; | |
29 | } | |
30 | ||
31 | while ((m = nextpk (lcp)) != NULL) { | |
32 | xp = mtod (m, struct x25_packet *); | |
33 | ||
34 | switch (pk_decode (xp) + lcp -> lcd_state) { | |
35 | /* | |
36 | * All the work is already done - just set the state and | |
37 | * pass to peer. | |
38 | */ | |
39 | case CALL + READY: | |
40 | lcp -> lcd_state = SENT_CALL; | |
41 | lcp -> lcd_timer = pk_t21; | |
42 | break; | |
43 | ||
44 | /* | |
45 | * Just set the state to allow packet to flow and send the | |
46 | * confirmation. | |
47 | */ | |
48 | case CALL_ACCEPTED + RECEIVED_CALL: | |
49 | lcp -> lcd_state = DATA_TRANSFER; | |
50 | break; | |
51 | ||
52 | /* | |
53 | * Just set the state. Keep the LCD around till the clear | |
54 | * confirmation is returned. | |
55 | */ | |
56 | case CLEAR + RECEIVED_CALL: | |
57 | case CLEAR + SENT_CALL: | |
58 | case CLEAR + DATA_TRANSFER: | |
59 | lcp -> lcd_state = SENT_CLEAR; | |
60 | lcp -> lcd_retry = 0; | |
61 | /* fall through */ | |
62 | ||
63 | case CLEAR + SENT_CLEAR: | |
64 | lcp -> lcd_timer = pk_t23; | |
65 | lcp -> lcd_retry++; | |
66 | break; | |
67 | ||
68 | case CLEAR_CONF + RECEIVED_CLEAR: | |
69 | case CLEAR_CONF + SENT_CLEAR: | |
70 | case CLEAR_CONF + READY: | |
71 | lcp -> lcd_state = READY; | |
72 | break; | |
73 | ||
74 | case DATA + DATA_TRANSFER: | |
75 | PS(xp) = lcp -> lcd_ssn; | |
76 | PR(xp) = lcp -> lcd_input_window; | |
77 | lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window; | |
78 | lcp -> lcd_ssn = (lcp -> lcd_ssn + 1) % MODULUS; | |
79 | if (lcp -> lcd_ssn == ((lcp -> lcd_output_window + pkp->pk_xcp->xc_pwsize) % MODULUS)) | |
80 | lcp -> lcd_window_condition = TRUE; | |
81 | break; | |
82 | ||
83 | case INTERRUPT + DATA_TRANSFER: | |
84 | xp -> packet_data = 0; | |
85 | lcp -> lcd_intrconf_pending = TRUE; | |
86 | break; | |
87 | ||
88 | case INTERRUPT_CONF + DATA_TRANSFER: | |
89 | break; | |
90 | ||
91 | case RR + DATA_TRANSFER: | |
92 | lcp -> lcd_input_window = (lcp -> lcd_input_window + 1) % MODULUS; | |
93 | PR(xp) = lcp -> lcd_input_window; | |
94 | lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window; | |
95 | break; | |
96 | ||
97 | case RNR + DATA_TRANSFER: | |
98 | PR(xp) = lcp -> lcd_input_window; | |
99 | lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window; | |
100 | break; | |
101 | ||
102 | case RESET + DATA_TRANSFER: | |
103 | lcp -> lcd_reset_condition = TRUE; | |
104 | break; | |
105 | ||
106 | case RESET_CONF + DATA_TRANSFER: | |
107 | lcp -> lcd_reset_condition = FALSE; | |
108 | break; | |
109 | ||
110 | /* | |
111 | * A restart should be only generated internally. Therefore | |
112 | * all logic for restart is in the pk_restart routine. | |
113 | */ | |
114 | case RESTART + READY: | |
115 | lcp -> lcd_timer = pk_t20; | |
116 | break; | |
117 | ||
118 | /* | |
119 | * Restarts are all handled internally. Therefore all the | |
120 | * logic for the incoming restart packet is handled in the | |
121 | * pk_input routine. | |
122 | */ | |
123 | case RESTART_CONF + READY: | |
124 | break; | |
125 | ||
126 | default: | |
127 | m_freem (m); | |
128 | return; | |
129 | } | |
130 | ||
131 | /* Trace the packet. */ | |
132 | pk_trace (pkp -> pk_xcp, xp, "P-Out"); | |
133 | ||
134 | /* Pass the packet on down to the link layer */ | |
135 | (*pkp -> pk_output) (m, pkp -> pk_xcp); | |
136 | } | |
137 | } | |
138 | ||
139 | /* | |
140 | * This procedure returns the next packet to send or null. A | |
141 | * packet is composed of one or more mbufs. | |
142 | */ | |
143 | ||
144 | struct mbuf * | |
145 | nextpk (lcp) | |
146 | struct pklcd *lcp; | |
147 | { | |
148 | register struct socket *so = lcp -> lcd_so; | |
149 | register struct mbuf *m = 0, *n; | |
150 | ||
151 | if (lcp -> lcd_template) { | |
152 | m = dtom (lcp -> lcd_template); | |
153 | lcp -> lcd_template = NULL; | |
154 | } else { | |
155 | if (lcp -> lcd_rnr_condition || lcp -> lcd_window_condition || | |
156 | lcp -> lcd_reset_condition) | |
157 | return (NULL); | |
158 | ||
159 | if (so == 0) | |
160 | return (NULL); | |
161 | ||
162 | if ((m = so -> so_snd.sb_mb) == 0) | |
163 | return (NULL); | |
164 | ||
165 | n = m; | |
166 | while (n) { | |
167 | sbfree (&so -> so_snd, n); | |
168 | #ifndef BSD4_3 | |
169 | if ((int) n -> m_act == 1) | |
170 | break; | |
171 | #endif | |
172 | n = n -> m_next; | |
173 | } | |
174 | ||
175 | #ifdef BSD4_3 | |
176 | so->so_snd.sb_mb = m->m_act; | |
177 | m->m_act = 0; | |
178 | #else | |
179 | if (n) { | |
180 | so -> so_snd.sb_mb = n -> m_next; | |
181 | n -> m_next = 0; | |
182 | } | |
183 | #endif | |
184 | } | |
185 | ||
186 | return (m); | |
187 | } |