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1 | /* |
2 | * Copyright (c) University of British Columbia, 1984 | |
a130a8be KS |
3 | * Copyright (C) Computer Science Department IV, |
4 | * University of Erlangen-Nuremberg, Germany, 1992 | |
e7a3707f KB |
5 | * Copyright (c) 1991, 1992, 1993 |
6 | * The Regents of the University of California. All rights reserved. | |
51386eb2 | 7 | * |
a130a8be KS |
8 | * This code is derived from software contributed to Berkeley by the |
9 | * Laboratory for Computation Vision and the Computer Science Department | |
10 | * of the the University of British Columbia and the Computer Science | |
11 | * Department (IV) of the University of Erlangen-Nuremberg, Germany. | |
51386eb2 KS |
12 | * |
13 | * %sccs.include.redist.c% | |
14 | * | |
e7a3707f | 15 | * @(#)pk_output.c 8.1 (Berkeley) %G% |
51386eb2 | 16 | */ |
0164bb81 | 17 | |
5548a02f KB |
18 | #include <sys/param.h> |
19 | #include <sys/systm.h> | |
20 | #include <sys/mbuf.h> | |
21 | #include <sys/socket.h> | |
22 | #include <sys/socketvar.h> | |
23 | #include <sys/protosw.h> | |
24 | #include <sys/errno.h> | |
0164bb81 | 25 | |
5548a02f | 26 | #include <net/if.h> |
0164bb81 | 27 | |
5548a02f KB |
28 | #include <netccitt/x25.h> |
29 | #include <netccitt/pk.h> | |
30 | #include <netccitt/pk_var.h> | |
0164bb81 | 31 | |
94c03198 | 32 | struct mbuf_cache pk_output_cache = {0 }, pk_input_cache; |
0164bb81 KS |
33 | struct mbuf *nextpk (); |
34 | ||
35 | pk_output (lcp) | |
36 | register struct pklcd *lcp; | |
37 | { | |
38 | register struct x25_packet *xp; | |
39 | register struct mbuf *m; | |
40 | register struct pkcb *pkp = lcp -> lcd_pkp; | |
41 | ||
42 | if (lcp == 0 || pkp == 0) { | |
43 | printf ("pk_output: zero arg\n"); | |
44 | return; | |
45 | } | |
46 | ||
47 | while ((m = nextpk (lcp)) != NULL) { | |
48 | xp = mtod (m, struct x25_packet *); | |
49 | ||
50 | switch (pk_decode (xp) + lcp -> lcd_state) { | |
51 | /* | |
52 | * All the work is already done - just set the state and | |
53 | * pass to peer. | |
54 | */ | |
55 | case CALL + READY: | |
56 | lcp -> lcd_state = SENT_CALL; | |
57 | lcp -> lcd_timer = pk_t21; | |
58 | break; | |
59 | ||
60 | /* | |
61 | * Just set the state to allow packet to flow and send the | |
62 | * confirmation. | |
63 | */ | |
64 | case CALL_ACCEPTED + RECEIVED_CALL: | |
65 | lcp -> lcd_state = DATA_TRANSFER; | |
66 | break; | |
67 | ||
68 | /* | |
69 | * Just set the state. Keep the LCD around till the clear | |
70 | * confirmation is returned. | |
71 | */ | |
72 | case CLEAR + RECEIVED_CALL: | |
73 | case CLEAR + SENT_CALL: | |
74 | case CLEAR + DATA_TRANSFER: | |
75 | lcp -> lcd_state = SENT_CLEAR; | |
76 | lcp -> lcd_retry = 0; | |
77 | /* fall through */ | |
78 | ||
79 | case CLEAR + SENT_CLEAR: | |
80 | lcp -> lcd_timer = pk_t23; | |
81 | lcp -> lcd_retry++; | |
82 | break; | |
83 | ||
84 | case CLEAR_CONF + RECEIVED_CLEAR: | |
85 | case CLEAR_CONF + SENT_CLEAR: | |
86 | case CLEAR_CONF + READY: | |
87 | lcp -> lcd_state = READY; | |
88 | break; | |
89 | ||
90 | case DATA + DATA_TRANSFER: | |
a130a8be | 91 | SPS(xp, lcp -> lcd_ssn); |
f3426482 KS |
92 | lcp -> lcd_input_window = |
93 | (lcp -> lcd_rsn + 1) % MODULUS; | |
a130a8be | 94 | SPR(xp, lcp -> lcd_input_window); |
0164bb81 KS |
95 | lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window; |
96 | lcp -> lcd_ssn = (lcp -> lcd_ssn + 1) % MODULUS; | |
06aa10f5 | 97 | if (lcp -> lcd_ssn == ((lcp -> lcd_output_window + lcp -> lcd_windowsize) % MODULUS)) |
0164bb81 KS |
98 | lcp -> lcd_window_condition = TRUE; |
99 | break; | |
100 | ||
101 | case INTERRUPT + DATA_TRANSFER: | |
c4b47c42 | 102 | #ifdef ancient_history |
0164bb81 | 103 | xp -> packet_data = 0; |
c4b47c42 | 104 | #endif |
0164bb81 KS |
105 | lcp -> lcd_intrconf_pending = TRUE; |
106 | break; | |
107 | ||
108 | case INTERRUPT_CONF + DATA_TRANSFER: | |
109 | break; | |
110 | ||
111 | case RR + DATA_TRANSFER: | |
0164bb81 | 112 | case RNR + DATA_TRANSFER: |
f3426482 KS |
113 | lcp -> lcd_input_window = |
114 | (lcp -> lcd_rsn + 1) % MODULUS; | |
a130a8be | 115 | SPR(xp, lcp -> lcd_input_window); |
0164bb81 KS |
116 | lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window; |
117 | break; | |
118 | ||
119 | case RESET + DATA_TRANSFER: | |
120 | lcp -> lcd_reset_condition = TRUE; | |
121 | break; | |
122 | ||
123 | case RESET_CONF + DATA_TRANSFER: | |
124 | lcp -> lcd_reset_condition = FALSE; | |
125 | break; | |
126 | ||
127 | /* | |
128 | * A restart should be only generated internally. Therefore | |
129 | * all logic for restart is in the pk_restart routine. | |
130 | */ | |
131 | case RESTART + READY: | |
132 | lcp -> lcd_timer = pk_t20; | |
133 | break; | |
134 | ||
135 | /* | |
136 | * Restarts are all handled internally. Therefore all the | |
137 | * logic for the incoming restart packet is handled in the | |
138 | * pk_input routine. | |
139 | */ | |
140 | case RESTART_CONF + READY: | |
141 | break; | |
142 | ||
143 | default: | |
144 | m_freem (m); | |
145 | return; | |
146 | } | |
147 | ||
148 | /* Trace the packet. */ | |
c4b47c42 | 149 | pk_trace (pkp -> pk_xcp, m, "P-Out"); |
0164bb81 KS |
150 | |
151 | /* Pass the packet on down to the link layer */ | |
94c03198 KS |
152 | if (pk_input_cache.mbc_size || pk_input_cache.mbc_oldsize) { |
153 | m->m_flags |= 0x08; | |
154 | mbuf_cache(&pk_input_cache, m); | |
155 | } | |
a130a8be | 156 | (*pkp -> pk_lloutput) (pkp -> pk_llnext, m, pkp -> pk_rt); |
0164bb81 KS |
157 | } |
158 | } | |
159 | ||
160 | /* | |
161 | * This procedure returns the next packet to send or null. A | |
162 | * packet is composed of one or more mbufs. | |
163 | */ | |
164 | ||
165 | struct mbuf * | |
166 | nextpk (lcp) | |
167 | struct pklcd *lcp; | |
168 | { | |
b84e7ca8 KS |
169 | register struct mbuf *m, *n; |
170 | struct socket *so = lcp -> lcd_so; | |
171 | register struct sockbuf *sb = & (so ? so -> so_snd : lcp -> lcd_sb); | |
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172 | |
173 | if (lcp -> lcd_template) { | |
c4b47c42 | 174 | m = lcp -> lcd_template; |
0164bb81 KS |
175 | lcp -> lcd_template = NULL; |
176 | } else { | |
177 | if (lcp -> lcd_rnr_condition || lcp -> lcd_window_condition || | |
178 | lcp -> lcd_reset_condition) | |
179 | return (NULL); | |
180 | ||
b84e7ca8 | 181 | if ((m = sb -> sb_mb) == 0) |
0164bb81 KS |
182 | return (NULL); |
183 | ||
b84e7ca8 | 184 | sb -> sb_mb = m -> m_nextpkt; |
0164bb81 | 185 | m->m_act = 0; |
b84e7ca8 KS |
186 | for (n = m; n; n = n -> m_next) |
187 | sbfree (sb, n); | |
0164bb81 | 188 | } |
0164bb81 KS |
189 | return (m); |
190 | } |