aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wan/sdla_x25.c
blob: 8a95d61a2f8ff0fa3b980990c13f2f32be00dd25 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
/*****************************************************************************
* sdla_x25.c	WANPIPE(tm) Multiprotocol WAN Link Driver.  X.25 module.
*
* Author:	Nenad Corbic	<ncorbic@sangoma.com>
*
* Copyright:	(c) 1995-2001 Sangoma Technologies Inc.
*
*		This program is free software; you can redistribute it and/or
*		modify it under the terms of the GNU General Public License
*		as published by the Free Software Foundation; either version
*		2 of the License, or (at your option) any later version.
* ============================================================================
* Apr 03, 2001  Nenad Corbic	 o Fixed the rx_skb=NULL bug in x25 in rx_intr().
* Dec 26, 2000  Nenad Corbic	 o Added a new polling routine, that uses
*                                  a kernel timer (more efficient).
* Dec 25, 2000  Nenad Corbic	 o Updated for 2.4.X kernel
* Jul 26, 2000  Nenad Corbic	 o Increased the local packet buffering
* 				   for API to 4096+header_size. 
* Jul 17, 2000  Nenad Corbic	 o Fixed the x25 startup bug. Enable 
* 				   communications only after all interfaces
* 				   come up.  HIGH SVC/PVC is used to calculate
* 				   the number of channels.
*                                  Enable protocol only after all interfaces
*                                  are enabled.
* Jul 10, 2000	Nenad Corbic	 o Fixed the M_BIT bug. 
* Apr 25, 2000  Nenad Corbic	 o Pass Modem messages to the API.
*                                  Disable idle timeout in X25 API.
* Apr 14, 2000  Nenad Corbic	 o Fixed: Large LCN number support.
*                                  Maximum LCN number is 4095.
*                                  Maximum number of X25 channels is 255.
* Apr 06, 2000  Nenad Corbic	 o Added SMP Support.
* Mar 29, 2000  Nenad Corbic	 o Added support for S514 PCI Card
* Mar 23, 2000  Nenad Corbic	 o Improved task queue, BH handling.
* Mar 14, 2000  Nenad Corbic  	 o Updated Protocol Violation handling
*                                  routines.  Bug Fix.
* Mar 10, 2000  Nenad Corbic	 o Bug Fix: corrupted mbox recovery.
* Mar 09, 2000  Nenad Corbic     o Fixed the auto HDLC bug.
* Mar 08, 2000	Nenad Corbic     o Fixed LAPB HDLC startup problems.
*                                  Application must bring the link up 
*                                  before tx/rx, and bring the 
*                                  link down on close().
* Mar 06, 2000	Nenad Corbic	 o Added an option for logging call setup 
*                                  information. 
* Feb 29, 2000  Nenad Corbic 	 o Added support for LAPB HDLC API
* Feb 25, 2000  Nenad Corbic     o Fixed the modem failure handling.
*                                  No Modem OOB message will be passed 
*                                  to the user.
* Feb 21, 2000  Nenad Corbic 	 o Added Xpipemon Debug Support
* Dec 30, 1999 	Nenad Corbic	 o Socket based X25API 
* Sep 17, 1998	Jaspreet Singh	 o Updates for 2.2.X  kernel
* Mar 15, 1998	Alan Cox	 o 2.1.x porting
* Dec 19, 1997	Jaspreet Singh	 o Added multi-channel IPX support
* Nov 27, 1997	Jaspreet Singh	 o Added protection against enabling of irqs
*				   when they are disabled.
* Nov 17, 1997  Farhan Thawar    o Added IPX support
*				 o Changed if_send() to now buffer packets when
*				   the board is busy
*				 o Removed queueing of packets via the polling
*				   routing
*				 o Changed if_send() critical flags to properly
*				   handle race conditions
* Nov 06, 1997  Farhan Thawar    o Added support for SVC timeouts
*				 o Changed PVC encapsulation to ETH_P_IP
* Jul 21, 1997  Jaspreet Singh	 o Fixed freeing up of buffers using kfree()
*				   when packets are received.
* Mar 11, 1997  Farhan Thawar   Version 3.1.1
*                                o added support for V35
*                                o changed if_send() to return 0 if
*                                  wandev.critical() is true
*                                o free socket buffer in if_send() if
*                                  returning 0
*                                o added support for single '@' address to
*                                  accept all incoming calls
*                                o fixed bug in set_chan_state() to disconnect
* Jan 15, 1997	Gene Kozin	Version 3.1.0
*				 o implemented exec() entry point
* Jan 07, 1997	Gene Kozin	Initial version.
*****************************************************************************/

/*======================================================
 * 	Includes 
 *=====================================================*/

#include <linux/module.h>
#include <linux/kernel.h>	/* printk(), and other useful stuff */
#include <linux/stddef.h>	/* offsetof(), etc. */
#include <linux/errno.h>	/* return codes */
#include <linux/string.h>	/* inline memset(), etc. */
#include <linux/ctype.h>
#include <linux/slab.h>	/* kmalloc(), kfree() */
#include <linux/wanrouter.h>	/* WAN router definitions */
#include <linux/wanpipe.h>	/* WANPIPE common user API definitions */
#include <linux/workqueue.h>
#include <linux/jiffies.h>	/* time_after() macro */
#include <asm/byteorder.h>	/* htons(), etc. */
#include <asm/atomic.h>
#include <linux/delay.h>	/* Experimental delay */

#include <asm/uaccess.h>

#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/sdla_x25.h>	/* X.25 firmware API definitions */
#include <linux/if_wanpipe_common.h>
#include <linux/if_wanpipe.h>


/*======================================================
 * 	Defines & Macros 
 *=====================================================*/


#define	CMD_OK		0		/* normal firmware return code */
#define	CMD_TIMEOUT	0xFF		/* firmware command timed out */
#define	MAX_CMD_RETRY	10		/* max number of firmware retries */

#define	X25_CHAN_MTU	4096		/* unfragmented logical channel MTU */
#define	X25_HRDHDR_SZ	7		/* max encapsulation header size */
#define	X25_CONCT_TMOUT	(90*HZ)		/* link connection timeout */
#define	X25_RECON_TMOUT	(10*HZ)		/* link connection timeout */
#define	CONNECT_TIMEOUT	(90*HZ)		/* link connection timeout */
#define	HOLD_DOWN_TIME	(30*HZ)		/* link hold down time */
#define MAX_BH_BUFF	10
#define M_BIT		0x01	

//#define PRINT_DEBUG 1
#ifdef PRINT_DEBUG
#define DBG_PRINTK(format, a...) printk(format, ## a)
#else
#define DBG_PRINTK(format, a...)
#endif  

#define TMR_INT_ENABLED_POLL_ACTIVE      0x01
#define TMR_INT_ENABLED_POLL_CONNECT_ON  0x02
#define TMR_INT_ENABLED_POLL_CONNECT_OFF 0x04
#define TMR_INT_ENABLED_POLL_DISCONNECT  0x08
#define TMR_INT_ENABLED_CMD_EXEC	 0x10
#define TMR_INT_ENABLED_UPDATE		 0x20
#define TMR_INT_ENABLED_UDP_PKT		 0x40

#define MAX_X25_ADDR_SIZE	16
#define MAX_X25_DATA_SIZE 	129
#define MAX_X25_FACL_SIZE	110

#define TRY_CMD_AGAIN	2
#define DELAY_RESULT    1
#define RETURN_RESULT   0

#define DCD(x) (x & 0x03 ? "HIGH" : "LOW")
#define CTS(x) (x & 0x05 ? "HIGH" : "LOW")


/* Driver will not write log messages about 
 * modem status if defined.*/
#define MODEM_NOT_LOG 1

/*==================================================== 
 * 	For IPXWAN 
 *===================================================*/

#define CVHexToAscii(b) (((unsigned char)(b) > (unsigned char)9) ? ((unsigned char)'A' + ((unsigned char)(b) - (unsigned char)10)) : ((unsigned char)'0' + (unsigned char)(b)))


/*====================================================
 *           MEMORY DEBUGGING FUNCTION
 *====================================================

#define KMEM_SAFETYZONE 8

static void * dbg_kmalloc(unsigned int size, int prio, int line) {
	int i = 0;
	void * v = kmalloc(size+sizeof(unsigned int)+2*KMEM_SAFETYZONE*8,prio);
	char * c1 = v;	
	c1 += sizeof(unsigned int);
	*((unsigned int *)v) = size;

	for (i = 0; i < KMEM_SAFETYZONE; i++) {
		c1[0] = 'D'; c1[1] = 'E'; c1[2] = 'A'; c1[3] = 'D';
		c1[4] = 'B'; c1[5] = 'E'; c1[6] = 'E'; c1[7] = 'F';
		c1 += 8;
	}
	c1 += size;
	for (i = 0; i < KMEM_SAFETYZONE; i++) {
		c1[0] = 'M'; c1[1] = 'U'; c1[2] = 'N'; c1[3] = 'G';
		c1[4] = 'W'; c1[5] = 'A'; c1[6] = 'L'; c1[7] = 'L';
		c1 += 8;
	}
	v = ((char *)v) + sizeof(unsigned int) + KMEM_SAFETYZONE*8;
	printk(KERN_INFO "line %d  kmalloc(%d,%d) = %p\n",line,size,prio,v);
	return v;
}
static void dbg_kfree(void * v, int line) {
	unsigned int * sp = (unsigned int *)(((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8));
	unsigned int size = *sp;
	char * c1 = ((char *)v) - KMEM_SAFETYZONE*8;
	int i = 0;
	for (i = 0; i < KMEM_SAFETYZONE; i++) {
		if (   c1[0] != 'D' || c1[1] != 'E' || c1[2] != 'A' || c1[3] != 'D'
		    || c1[4] != 'B' || c1[5] != 'E' || c1[6] != 'E' || c1[7] != 'F') {
			printk(KERN_INFO "kmalloced block at %p has been corrupted (underrun)!\n",v);
			printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
			                c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
		}
		c1 += 8;
	}
	c1 += size;
	for (i = 0; i < KMEM_SAFETYZONE; i++) {
		if (   c1[0] != 'M' || c1[1] != 'U' || c1[2] != 'N' || c1[3] != 'G'
		    || c1[4] != 'W' || c1[5] != 'A' || c1[6] != 'L' || c1[7] != 'L'
		   ) {
			printk(KERN_INFO "kmalloced block at %p has been corrupted (overrun):\n",v);
			printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
			                c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
		}
		c1 += 8;
	}
	printk(KERN_INFO "line %d  kfree(%p)\n",line,v);
	v = ((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8);
	kfree(v);
}

#define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
#define kfree(x) dbg_kfree(x,__LINE__)

==============================================================*/



/*===============================================
 * 	Data Structures 
 *===============================================*/


/*========================================================
 * Name: 	x25_channel
 *
 * Purpose:	To hold private informaton for each  
 *              logical channel.
 *		
 * Rationale:  	Per-channel debugging is possible if each 
 *              channel has its own private area.
 *	
 * Assumptions:
 *
 * Description:	This is an extention of the struct net_device
 *              we create for each network interface to keep 
 *              the rest of X.25 channel-specific data. 
 *
 * Construct:	Typedef
 */
typedef struct x25_channel
{
	wanpipe_common_t common;	/* common area for x25api and socket */
	char name[WAN_IFNAME_SZ+1];	/* interface name, ASCIIZ */
	char addr[WAN_ADDRESS_SZ+1];	/* media address, ASCIIZ */
	unsigned tx_pkt_size;
	unsigned short protocol;	/* ethertype, 0 - multiplexed */
	char drop_sequence;		/* mark sequence for dropping */
	unsigned long state_tick;	/* time of the last state change */
	unsigned idle_timeout;		/* sec, before disconnecting */
	unsigned long i_timeout_sofar;  /* # of sec's we've been idle */
	unsigned hold_timeout;		/* sec, before re-connecting */
	unsigned long tick_counter;	/* counter for transmit time out */
	char devtint;			/* Weather we should dev_tint() */
	struct sk_buff* rx_skb;		/* receive socket buffer */
	struct sk_buff* tx_skb;		/* transmit socket buffer */

	bh_data_t *bh_head;	  	  /* Circular buffer for x25api_bh */
	unsigned long  tq_working;
	volatile int  bh_write;
	volatile int  bh_read;
	atomic_t  bh_buff_used;

	sdla_t* card;			/* -> owner */
	struct net_device *dev;		/* -> bound devce */

	int ch_idx;
	unsigned char enable_IPX;
	unsigned long network_number;
	struct net_device_stats ifstats;	/* interface statistics */
	unsigned short transmit_length;
	unsigned short tx_offset;
	char transmit_buffer[X25_CHAN_MTU+sizeof(x25api_hdr_t)];

	if_send_stat_t   if_send_stat;
        rx_intr_stat_t   rx_intr_stat;
        pipe_mgmt_stat_t pipe_mgmt_stat;    

	unsigned long router_start_time; /* Router start time in seconds */
	unsigned long router_up_time;
	
} x25_channel_t;

/* FIXME Take this out */

#ifdef NEX_OLD_CALL_INFO
typedef struct x25_call_info
{
	char dest[17];			PACKED;/* ASCIIZ destination address */
	char src[17];			PACKED;/* ASCIIZ source address */
	char nuser;			PACKED;/* number of user data bytes */
	unsigned char user[127];	PACKED;/* user data */
	char nfacil;			PACKED;/* number of facilities */
	struct
	{
		unsigned char code;     PACKED;
		unsigned char parm;     PACKED;
	} facil[64];			        /* facilities */
} x25_call_info_t;
#else
typedef struct x25_call_info
{
	char dest[MAX_X25_ADDR_SIZE]		PACKED;/* ASCIIZ destination address */
	char src[MAX_X25_ADDR_SIZE]		PACKED;/* ASCIIZ source address */
	unsigned char nuser			PACKED;
	unsigned char user[MAX_X25_DATA_SIZE]	PACKED;/* user data */
	unsigned char nfacil			PACKED;
	unsigned char facil[MAX_X25_FACL_SIZE]	PACKED;
	unsigned short lcn             		PACKED;
} x25_call_info_t;
#endif


  
/*===============================================
 *	Private Function Prototypes
 *==============================================*/


/*================================================= 
 * WAN link driver entry points. These are 
 * called by the WAN router module.
 */
static int update(struct wan_device* wandev);
static int new_if(struct wan_device* wandev, struct net_device* dev,
		  wanif_conf_t* conf);
static int del_if(struct wan_device* wandev, struct net_device* dev);
static void disable_comm (sdla_t* card);
static void disable_comm_shutdown(sdla_t *card);



/*================================================= 
 *	WANPIPE-specific entry points 
 */
static int wpx_exec (struct sdla* card, void* u_cmd, void* u_data);
static void x25api_bh(struct net_device *dev);
static int x25api_bh_cleanup(struct net_device *dev);
static int bh_enqueue(struct net_device *dev, struct sk_buff *skb);


/*=================================================  
 * 	Network device interface 
 */
static int if_init(struct net_device* dev);
static int if_open(struct net_device* dev);
static int if_close(struct net_device* dev);
static int if_header(struct sk_buff* skb, struct net_device* dev,
	unsigned short type, void* daddr, void* saddr, unsigned len);
static int if_rebuild_hdr (struct sk_buff* skb);
static int if_send(struct sk_buff* skb, struct net_device* dev);
static struct net_device_stats *if_stats(struct net_device* dev);

static void if_tx_timeout(struct net_device *dev);

/*=================================================  
 * 	Interrupt handlers 
 */
static void wpx_isr	(sdla_t *);
static void rx_intr	(sdla_t *);
static void tx_intr	(sdla_t *);
static void status_intr	(sdla_t *);
static void event_intr	(sdla_t *);
static void spur_intr	(sdla_t *);
static void timer_intr  (sdla_t *);

static int tx_intr_send(sdla_t *card, struct net_device *dev);
static struct net_device *move_dev_to_next(sdla_t *card,
					   struct net_device *dev);

/*=================================================  
 *	Background polling routines 
 */
static void wpx_poll (sdla_t* card);
static void poll_disconnected (sdla_t* card);
static void poll_connecting (sdla_t* card);
static void poll_active (sdla_t* card);
static void trigger_x25_poll(sdla_t *card);
static void x25_timer_routine(unsigned long data);



/*=================================================  
 *	X.25 firmware interface functions 
 */
static int x25_get_version (sdla_t* card, char* str);
static int x25_configure (sdla_t* card, TX25Config* conf);
static int hdlc_configure (sdla_t* card, TX25Config* conf);
static int set_hdlc_level (sdla_t* card);
static int x25_get_err_stats (sdla_t* card);
static int x25_get_stats (sdla_t* card);
static int x25_set_intr_mode (sdla_t* card, int mode);
static int x25_close_hdlc (sdla_t* card);
static int x25_open_hdlc (sdla_t* card);
static int x25_setup_hdlc (sdla_t* card);
static int x25_set_dtr (sdla_t* card, int dtr);
static int x25_get_chan_conf (sdla_t* card, x25_channel_t* chan);
static int x25_place_call (sdla_t* card, x25_channel_t* chan);
static int x25_accept_call (sdla_t* card, int lcn, int qdm);
static int x25_clear_call (sdla_t* card, int lcn, int cause, int diagn);
static int x25_send (sdla_t* card, int lcn, int qdm, int len, void* buf);
static int x25_fetch_events (sdla_t* card);
static int x25_error (sdla_t* card, int err, int cmd, int lcn);

/*=================================================  
 *	X.25 asynchronous event handlers 
 */
static int incoming_call (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);
static int call_accepted (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);
static int call_cleared (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);
static int timeout_event (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);
static int restart_event (sdla_t* card, int cmd, int lcn, TX25Mbox* mb);


/*=================================================  
 *	Miscellaneous functions 
 */
static int connect (sdla_t* card);
static int disconnect (sdla_t* card);
static struct net_device* get_dev_by_lcn(struct wan_device* wandev,
					 unsigned lcn);
static int chan_connect(struct net_device* dev);
static int chan_disc(struct net_device* dev);
static void set_chan_state(struct net_device* dev, int state);
static int chan_send(struct net_device *dev, void* buff, unsigned data_len,
		     unsigned char tx_intr);
static unsigned char bps_to_speed_code (unsigned long bps);
static unsigned int dec_to_uint (unsigned char* str, int len);
static unsigned int hex_to_uint (unsigned char*, int);
static void parse_call_info (unsigned char*, x25_call_info_t*);
static struct net_device *find_channel(sdla_t *card, unsigned lcn);
static void bind_lcn_to_dev(sdla_t *card, struct net_device *dev, unsigned lcn);
static void setup_for_delayed_transmit(struct net_device *dev,
				       void *buf, unsigned len);


/*=================================================  
 *      X25 API Functions 
 */
static int wanpipe_pull_data_in_skb(sdla_t *card, struct net_device *dev,
				    struct sk_buff **);
static void timer_intr_exec(sdla_t *, unsigned char);
static int execute_delayed_cmd(sdla_t *card, struct net_device *dev,
			       mbox_cmd_t *usr_cmd, char bad_cmd);
static int api_incoming_call (sdla_t*, TX25Mbox *, int);
static int alloc_and_init_skb_buf (sdla_t *,struct sk_buff **, int);
static void send_delayed_cmd_result(sdla_t *card, struct net_device *dev,
				    TX25Mbox* mbox);
static int clear_confirm_event (sdla_t *, TX25Mbox*);
static void send_oob_msg (sdla_t *card, struct net_device *dev, TX25Mbox *mbox);
static int timer_intr_cmd_exec(sdla_t *card);
static void api_oob_event (sdla_t *card,TX25Mbox *mbox);
static int check_bad_command(sdla_t *card, struct net_device *dev);
static int channel_disconnect(sdla_t* card, struct net_device *dev);
static void hdlc_link_down (sdla_t*);

/*=================================================
 *     XPIPEMON Functions
 */
static int process_udp_mgmt_pkt(sdla_t *);
static int udp_pkt_type( struct sk_buff *, sdla_t*);
static int reply_udp( unsigned char *, unsigned int); 
static void init_x25_channel_struct( x25_channel_t *);
static void init_global_statistics( sdla_t *);
static int store_udp_mgmt_pkt(int udp_type, char udp_pkt_src, sdla_t *card,
			      struct net_device *dev,
			      struct sk_buff *skb, int lcn);
static unsigned short calc_checksum (char *, int);



/*================================================= 
 *	IPX functions 
 */
static void switch_net_numbers(unsigned char *, unsigned long, unsigned char);
static int handle_IPXWAN(unsigned char *, char *, unsigned char , 
			 unsigned long , unsigned short );

extern void disable_irq(unsigned int);
extern void enable_irq(unsigned int);

static void S508_S514_lock(sdla_t *, unsigned long *);
static void S508_S514_unlock(sdla_t *, unsigned long *);


/*=================================================  
 * 	Global Variables 
 *=================================================*/



/*================================================= 
 *	Public Functions 
 *=================================================*/




/*===================================================================
 * wpx_init:	X.25 Protocol Initialization routine.
 *
 * Purpose:	To initialize the protocol/firmware.
 * 
 * Rationale:	This function is called by setup() function, in
 *              sdlamain.c, to dynamically setup the x25 protocol.
 *		This is the first protocol specific function, which
 *              executes once on startup.
 *                
 * Description:	This procedure initializes the x25 firmware and
 *    		sets up the mailbox, transmit and receive buffer
 *              pointers. It also initializes all debugging structures
 *              and sets up the X25 environment.
 *
 *		Sets up hardware options defined by user in [wanpipe#] 
 *		section of wanpipe#.conf configuration file. 
 *
 * 		At this point adapter is completely initialized 
 *      	and X.25 firmware is running.
 *  		o read firmware version (to make sure it's alive)
 *  		o configure adapter
 *  		o initialize protocol-specific fields of the 
 *                adapter data space.
 *
 * Called by:	setup() function in sdlamain.c
 *
 * Assumptions:	None
 *
 * Warnings:	None
 *
 * Return: 	0	o.k.
 *	 	< 0	failure.
 */

int wpx_init (sdla_t* card, wandev_conf_t* conf)
{
	union{
		char str[80];
		TX25Config cfg;
	} u;

	/* Verify configuration ID */
	if (conf->config_id != WANCONFIG_X25){
		printk(KERN_INFO "%s: invalid configuration ID %u!\n",
			card->devname, conf->config_id)
		;
		return -EINVAL;
	}

	/* Initialize protocol-specific fields */
	card->mbox  = (void*)(card->hw.dpmbase + X25_MBOX_OFFS);
	card->rxmb  = (void*)(card->hw.dpmbase + X25_RXMBOX_OFFS);
	card->flags = (void*)(card->hw.dpmbase + X25_STATUS_OFFS);

	/* Initialize for S514 Card */
	if(card->hw.type == SDLA_S514) {
		card->mbox += X25_MB_VECTOR;
		card->flags += X25_MB_VECTOR;
		card->rxmb += X25_MB_VECTOR;
	}


	/* Read firmware version.  Note that when adapter initializes, it
	 * clears the mailbox, so it may appear that the first command was
	 * executed successfully when in fact it was merely erased. To work
	 * around this, we execute the first command twice.
	 */
	if (x25_get_version(card, NULL) || x25_get_version(card, u.str))
		return -EIO;


	/* X25 firmware can run ether in X25 or LAPB HDLC mode.
         * Check the user defined option and configure accordingly */
	if (conf->u.x25.LAPB_hdlc_only == WANOPT_YES){
		if (set_hdlc_level(card) != CMD_OK){
			return -EIO;	
		}else{
			printk(KERN_INFO "%s: running LAP_B HDLC firmware v%s\n",
				card->devname, u.str);
		}
		card->u.x.LAPB_hdlc = 1;
	}else{
		printk(KERN_INFO "%s: running X.25 firmware v%s\n",
				card->devname, u.str);
		card->u.x.LAPB_hdlc = 0;
	}

	/* Configure adapter. Here we set resonable defaults, then parse
	 * device configuration structure and set configuration options.
	 * Most configuration options are verified and corrected (if
	 * necessary) since we can't rely on the adapter to do so.
	 */
	memset(&u.cfg, 0, sizeof(u.cfg));
	u.cfg.t1		= 3;
	u.cfg.n2		= 10;
	u.cfg.autoHdlc		= 1;		/* automatic HDLC connection */
	u.cfg.hdlcWindow	= 7;
	u.cfg.pktWindow		= 2;
	u.cfg.station		= 1;		/* DTE */
	u.cfg.options		= 0x0090;	/* disable D-bit pragmatics */
	u.cfg.ccittCompat	= 1988;
	u.cfg.t10t20		= 30;
	u.cfg.t11t21		= 30;
	u.cfg.t12t22		= 30;
	u.cfg.t13t23		= 30;
	u.cfg.t16t26		= 30;
	u.cfg.t28		= 30;
	u.cfg.r10r20		= 5;
	u.cfg.r12r22		= 5;
	u.cfg.r13r23		= 5;
	u.cfg.responseOpt	= 1;		/* RR's after every packet */

	if (card->u.x.LAPB_hdlc){
		u.cfg.hdlcMTU = 1027;
	}

	if (conf->u.x25.x25_conf_opt){
		u.cfg.options = conf->u.x25.x25_conf_opt;
	}

	if (conf->clocking != WANOPT_EXTERNAL)
		u.cfg.baudRate = bps_to_speed_code(conf->bps);

	if (conf->station != WANOPT_DTE){
		u.cfg.station = 0;		/* DCE mode */
	}

        if (conf->interface != WANOPT_RS232 ){
	        u.cfg.hdlcOptions |= 0x80;      /* V35 mode */
	} 

	/* adjust MTU */
	if (!conf->mtu || (conf->mtu >= 1024))
		card->wandev.mtu = 1024;
	else if (conf->mtu >= 512)
		card->wandev.mtu = 512;
	else if (conf->mtu >= 256)
		card->wandev.mtu = 256;
	else if (conf->mtu >= 128)
		card->wandev.mtu = 128;
	else 
		card->wandev.mtu = 64;

	u.cfg.defPktSize = u.cfg.pktMTU = card->wandev.mtu;

	if (conf->u.x25.hi_pvc){
		card->u.x.hi_pvc = min_t(unsigned int, conf->u.x25.hi_pvc, MAX_LCN_NUM);
		card->u.x.lo_pvc = min_t(unsigned int, conf->u.x25.lo_pvc, card->u.x.hi_pvc);
	}

	if (conf->u.x25.hi_svc){
		card->u.x.hi_svc = min_t(unsigned int, conf->u.x25.hi_svc, MAX_LCN_NUM);
		card->u.x.lo_svc = min_t(unsigned int, conf->u.x25.lo_svc, card->u.x.hi_svc);
	}

	/* Figure out the total number of channels to configure */
	card->u.x.num_of_ch = 0;
	if (card->u.x.hi_svc != 0){
		card->u.x.num_of_ch = (card->u.x.hi_svc - card->u.x.lo_svc) + 1;
	}
	if (card->u.x.hi_pvc != 0){
		card->u.x.num_of_ch += (card->u.x.hi_pvc - card->u.x.lo_pvc) + 1;
	}

	if (card->u.x.num_of_ch == 0){
		printk(KERN_INFO "%s: ERROR, Minimum number of PVC/SVC channels is 1 !\n"
				 "%s: Please set the Lowest/Highest PVC/SVC values !\n",
				 card->devname,card->devname);
		return -ECHRNG;
	}
	
	u.cfg.loPVC = card->u.x.lo_pvc;
	u.cfg.hiPVC = card->u.x.hi_pvc;
	u.cfg.loTwoWaySVC = card->u.x.lo_svc;
	u.cfg.hiTwoWaySVC = card->u.x.hi_svc;

	if (conf->u.x25.hdlc_window)
		u.cfg.hdlcWindow = min_t(unsigned int, conf->u.x25.hdlc_window, 7);
	if (conf->u.x25.pkt_window)
		u.cfg.pktWindow = min_t(unsigned int, conf->u.x25.pkt_window, 7);

	if (conf->u.x25.t1)
		u.cfg.t1 = min_t(unsigned int, conf->u.x25.t1, 30);
	if (conf->u.x25.t2)
		u.cfg.t2 = min_t(unsigned int, conf->u.x25.t2, 29);
	if (conf->u.x25.t4)
		u.cfg.t4 = min_t(unsigned int, conf->u.x25.t4, 240);
	if (conf->u.x25.n2)
		u.cfg.n2 = min_t(unsigned int, conf->u.x25.n2, 30);

	if (conf->u.x25.t10_t20)
		u.cfg.t10t20 = min_t(unsigned int, conf->u.x25.t10_t20,255);
	if (conf->u.x25.t11_t21)
		u.cfg.t11t21 = min_t(unsigned int, conf->u.x25.t11_t21,255);
	if (conf->u.x25.t12_t22)
		u.cfg.t12t22 = min_t(unsigned int, conf->u.x25.t12_t22,255);
	if (conf->u.x25.t13_t23)	
		u.cfg.t13t23 = min_t(unsigned int, conf->u.x25.t13_t23,255);
	if (conf->u.x25.t16_t26)
		u.cfg.t16t26 = min_t(unsigned int, conf->u.x25.t16_t26, 255);
	if (conf->u.x25.t28)
		u.cfg.t28 = min_t(unsigned int, conf->u.x25.t28, 255);

	if (conf->u.x25.r10_r20)
		u.cfg.r10r20 = min_t(unsigned int, conf->u.x25.r10_r20,250);
	if (conf->u.x25.r12_r22)
		u.cfg.r12r22 = min_t(unsigned int, conf->u.x25.r12_r22,250);
	if (conf->u.x25.r13_r23)
		u.cfg.r13r23 = min_t(unsigned int, conf->u.x25.r13_r23,250);


	if (conf->u.x25.ccitt_compat)
		u.cfg.ccittCompat = conf->u.x25.ccitt_compat;

	/* initialize adapter */
	if (card->u.x.LAPB_hdlc){
		if (hdlc_configure(card, &u.cfg) != CMD_OK)
			return -EIO;
	}else{
		if (x25_configure(card, &u.cfg) != CMD_OK)
			return -EIO;
	}

	if ((x25_close_hdlc(card) != CMD_OK) ||		/* close HDLC link */
	    (x25_set_dtr(card, 0) != CMD_OK))		/* drop DTR */
		return -EIO;

	/* Initialize protocol-specific fields of adapter data space */
	card->wandev.bps	= conf->bps;
	card->wandev.interface	= conf->interface;
	card->wandev.clocking	= conf->clocking;
	card->wandev.station	= conf->station;
	card->isr		= &wpx_isr;
	card->poll		= NULL; //&wpx_poll;
	card->disable_comm	= &disable_comm;
	card->exec		= &wpx_exec;
	card->wandev.update	= &update;
	card->wandev.new_if	= &new_if;
	card->wandev.del_if	= &del_if;

	/* WARNING: This function cannot exit with an error
	 *          after the change of state */
	card->wandev.state	= WAN_DISCONNECTED;
	
	card->wandev.enable_tx_int = 0;
	card->irq_dis_if_send_count = 0;
        card->irq_dis_poll_count = 0;
	card->u.x.tx_dev = NULL;
	card->u.x.no_dev = 0;


	/* Configure for S514 PCI Card */
	if (card->hw.type == SDLA_S514) {
		card->u.x.hdlc_buf_status = 
			(volatile unsigned char *)
				(card->hw.dpmbase + X25_MB_VECTOR+ X25_MISC_HDLC_BITS);
	}else{
		card->u.x.hdlc_buf_status = 
			(volatile unsigned char *)(card->hw.dpmbase + X25_MISC_HDLC_BITS); 
	}

	card->u.x.poll_device=NULL;
	card->wandev.udp_port = conf->udp_port;

	/* Enable or disable call setup logging */
	if (conf->u.x25.logging == WANOPT_YES){
		printk(KERN_INFO "%s: Enabling Call Logging.\n",
			card->devname);
		card->u.x.logging = 1;
	}else{	
		card->u.x.logging = 0;
	}

	/* Enable or disable modem status reporting */
	if (conf->u.x25.oob_on_modem == WANOPT_YES){
		printk(KERN_INFO "%s: Enabling OOB on Modem change.\n",
			card->devname);
		card->u.x.oob_on_modem = 1;
	}else{
		card->u.x.oob_on_modem = 0;
	}
	
	init_global_statistics(card);	

	INIT_WORK(&card->u.x.x25_poll_work, (void *)wpx_poll, card);

	init_timer(&card->u.x.x25_timer);
	card->u.x.x25_timer.data = (unsigned long)card;
	card->u.x.x25_timer.function = x25_timer_routine;
	
	return 0;
}

/*=========================================================
 *	WAN Device Driver Entry Points 
 *========================================================*/

/*============================================================
 * Name:	update(),  Update device status & statistics.
 *
 * Purpose:	To provide debugging and statitical
 *              information to the /proc file system.
 *              /proc/net/wanrouter/wanpipe#
 *              	
 * Rationale:	The /proc file system is used to collect
 *              information about the kernel and drivers.
 *              Using the /proc file system the user
 *              can see exactly what the sangoma drivers are
 *              doing. And in what state they are in. 
 *                
 * Description: Collect all driver statistical information
 *              and pass it to the top laywer. 
 *		
 *		Since we have to execute a debugging command, 
 *              to obtain firmware statitics, we trigger a 
 *              UPDATE function within the timer interrtup.
 *              We wait until the timer update is complete.
 *              Once complete return the appropriate return
 *              code to indicate that the update was successful.
 *              
 * Called by:	device_stat() in wanmain.c
 *
 * Assumptions:	
 *
 * Warnings:	This function will degrade the performance
 *              of the router, since it uses the mailbox. 
 *
 * Return: 	0 	OK
 * 		<0	Failed (or busy).
 */

static int update(struct wan_device* wandev)
{
	volatile sdla_t* card;
	TX25Status* status;
	unsigned long timeout;

	/* sanity checks */
	if ((wandev == NULL) || (wandev->private == NULL))
		return -EFAULT;

	if (wandev->state == WAN_UNCONFIGURED)
		return -ENODEV;

	if (test_bit(SEND_CRIT, (void*)&wandev->critical))
		return -EAGAIN;

	if (!wandev->dev)
		return -ENODEV;
	
	card = wandev->private;
	status = card->flags;

	card->u.x.timer_int_enabled |= TMR_INT_ENABLED_UPDATE;
	status->imask |= INTR_ON_TIMER;
	timeout = jiffies;	

	for (;;){
		if (!(card->u.x.timer_int_enabled & TMR_INT_ENABLED_UPDATE)){	
			break;
		}
		if (time_after(jiffies, timeout + 1*HZ)){
			card->u.x.timer_int_enabled &= ~TMR_INT_ENABLED_UPDATE;
			return -EAGAIN;
		}
	}
	return 0;
}


/*===================================================================
 * Name:	new_if
 *
 * Purpose:	To allocate and initialize resources for a 
 *              new logical channel.  
 * 
 * Rationale:	A new channel can be added dynamically via
 *              ioctl call.
 *                
 * Description:	Allocate a private channel structure, x25_channel_t.
 *		Parse the user interface options from wanpipe#.conf 
 *		configuration file. 
 *		Bind the private are into the network device private
 *              area pointer (dev->priv).
 *		Prepare the network device structure for registration.
 *
 * Called by:	ROUTER_IFNEW Ioctl call, from wanrouter_ioctl() 
 *              (wanmain.c)
 *
 * Assumptions: None
 *
 * Warnings:	None
 *
 * Return: 	0 	Ok
 *		<0 	Failed (channel will not be created)
 */
static int new_if(struct wan_device* wandev, struct net_device* dev,
		  wanif_conf_t* conf)
{
	sdla_t* card = wandev->private;
	x25_channel_t* chan;
	int err = 0;

	if ((conf->name[0] == '\0') || (strlen(conf->name) > WAN_IFNAME_SZ)){
		printk(KERN_INFO "%s: invalid interface name!\n",
			card->devname);
		return -EINVAL;
	}

	if(card->wandev.new_if_cnt++ > 0 && card->u.x.LAPB_hdlc) {
		printk(KERN_INFO "%s: Error: Running LAPB HDLC Mode !\n",
						card->devname);
		printk(KERN_INFO 
			"%s: Maximum number of network interfaces must be one !\n",
						card->devname);
		return -EEXIST;
	}

	/* allocate and initialize private data */
	chan = kmalloc(sizeof(x25_channel_t), GFP_ATOMIC);
	if (chan == NULL){
		return -ENOMEM;
	}
	
	memset(chan, 0, sizeof(x25_channel_t));

	/* Bug Fix: Seg Err on PVC startup
	 * It must be here since bind_lcn_to_dev expects 
	 * it bellow */
	dev->priv = chan;
	
	strcpy(chan->name, conf->name);
	chan->card = card;
	chan->dev = dev;
	chan->common.sk = NULL;
	chan->common.func = NULL;
	chan->common.rw_bind = 0;
	chan->tx_skb = chan->rx_skb = NULL;

	/* verify media address */
	if (conf->addr[0] == '@'){		/* SVC */
		chan->common.svc = 1;
		strncpy(chan->addr, &conf->addr[1], WAN_ADDRESS_SZ);

		/* Set channel timeouts (default if not specified) */
		chan->idle_timeout = (conf->idle_timeout) ? 
					conf->idle_timeout : 90;
		chan->hold_timeout = (conf->hold_timeout) ? 
					conf->hold_timeout : 10;

	}else if (is_digit(conf->addr[0])){	/* PVC */
		int lcn = dec_to_uint(conf->addr, 0);

		if ((lcn >= card->u.x.lo_pvc) && (lcn <= card->u.x.hi_pvc)){
			bind_lcn_to_dev (card, dev, lcn);
		}else{
			printk(KERN_ERR
				"%s: PVC %u is out of range on interface %s!\n",
				wandev->name, lcn, chan->name);
			err = -EINVAL;
		}
	}else{
		printk(KERN_ERR
			"%s: invalid media address on interface %s!\n",
			wandev->name, chan->name);
		err = -EINVAL;
	}

	if(strcmp(conf->usedby, "WANPIPE") == 0){
                printk(KERN_INFO "%s: Running in WANPIPE mode %s\n",
			wandev->name, chan->name);
                chan->common.usedby = WANPIPE;
		chan->protocol = htons(ETH_P_IP);

        }else if(strcmp(conf->usedby, "API") == 0){
		chan->common.usedby = API;
                printk(KERN_INFO "%s: Running in API mode %s\n",
			wandev->name, chan->name);
		chan->protocol = htons(X25_PROT);
	}


	if (err){
		kfree(chan);
		dev->priv = NULL;
		return err;
	}
	
	chan->enable_IPX = conf->enable_IPX;
	
	if (chan->enable_IPX)
		chan->protocol = htons(ETH_P_IPX);
	
	if (conf->network_number)
		chan->network_number = conf->network_number;
	else
		chan->network_number = 0xDEADBEEF;

	/* prepare network device data space for registration */
	strcpy(dev->name,chan->name);

	dev->init = &if_init;

	init_x25_channel_struct(chan);

	return 0;
}

/*===================================================================
 * Name:	del_if(),  Remove a logical channel.	 
 *
 * Purpose:	To dynamically remove a logical channel.
 * 
 * Rationale:	Each logical channel should be dynamically
 *              removable. This functin is called by an 
 *              IOCTL_IFDEL ioctl call or shutdown(). 
 *                
 * Description: Do nothing.
 *
 * Called by:	IOCTL_IFDEL : wanrouter_ioctl() from wanmain.c
 *              shutdown() from sdlamain.c
 *
 * Assumptions: 
 *
 * Warnings:
 *
 * Return: 	0 Ok. Void function.
 */

//FIXME Del IF Should be taken out now.

static int del_if(struct wan_device* wandev, struct net_device* dev)
{
	return 0;
}


/*============================================================
 * Name:	wpx_exec
 *
 * Description:	Execute adapter interface command.
 * 		This option is currently dissabled.
 *===========================================================*/

static int wpx_exec (struct sdla* card, void* u_cmd, void* u_data)
{
        return 0;
}

/*============================================================
 * Name:	disable_comm	
 *
 * Description:	Disable communications during shutdown.
 *              Dont check return code because there is 
 *              nothing we can do about it.  
 *
 * Warning:	Dev and private areas are gone at this point.
 *===========================================================*/

static void disable_comm(sdla_t* card)
{
	disable_comm_shutdown(card);
	del_timer(&card->u.x.x25_timer);
	return;
}


/*============================================================
 *	Network Device Interface 
 *===========================================================*/

/*===================================================================
 * Name:	if_init(),   Netowrk Interface Initialization 	 
 *
 * Purpose:	To initialize a network interface device structure.
 * 
 * Rationale:	During network interface startup, the if_init
 *              is called by the kernel to initialize the
 *              netowrk device structure.  Thus a driver
 *              can customze a network device. 
 *                
 * Description:	Initialize the netowrk device call back
 *              routines.  This is where we tell the kernel
 *              which function to use when it wants to send
 *              via our interface. 
 *		Furthermore, we initialize the device flags, 
 *              MTU and physical address of the board.
 *
 * Called by:	Kernel (/usr/src/linux/net/core/dev.c)
 * 		(dev->init())
 *
 * Assumptions: None
 *	
 * Warnings:	None
 *
 * Return: 	0 	Ok : Void function.
 */
static int if_init(struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	struct wan_device* wandev = &card->wandev;

	/* Initialize device driver entry points */
	dev->open		= &if_open;
	dev->stop		= &if_close;
	dev->hard_header	= &if_header;
	dev->rebuild_header	= &if_rebuild_hdr;
	dev->hard_start_xmit	= &if_send;
	dev->get_stats		= &if_stats;
	dev->tx_timeout		= &if_tx_timeout;
	dev->watchdog_timeo	= TX_TIMEOUT;

	/* Initialize media-specific parameters */
	dev->type		= ARPHRD_PPP;		/* ARP h/w type */
	dev->flags		|= IFF_POINTOPOINT;
	dev->flags		|= IFF_NOARP;

	if (chan->common.usedby == API){
		dev->mtu	= X25_CHAN_MTU+sizeof(x25api_hdr_t);
	}else{
		dev->mtu	= card->wandev.mtu; 	
	}
	
	dev->hard_header_len	= X25_HRDHDR_SZ; /* media header length */
	dev->addr_len		= 2;		/* hardware address length */
	
	if (!chan->common.svc){
		*(unsigned short*)dev->dev_addr = htons(chan->common.lcn);
	}
	
	/* Initialize hardware parameters (just for reference) */
	dev->irq	= wandev->irq;
	dev->dma	= wandev->dma;
	dev->base_addr	= wandev->ioport;
	dev->mem_start	= (unsigned long)wandev->maddr;
	dev->mem_end	= wandev->maddr + wandev->msize - 1;

        /* Set transmit buffer queue length */
        dev->tx_queue_len = 100;
	SET_MODULE_OWNER(dev);

	/* FIXME Why are we doing this */
	set_chan_state(dev, WAN_DISCONNECTED);
	return 0;
}


/*===================================================================
 * Name:	if_open(),   Open/Bring up the Netowrk Interface 
 *
 * Purpose:	To bring up a network interface.
 * 
 * Rationale:	
 *                
 * Description:	Open network interface.
 * 		o prevent module from unloading by incrementing use count
 * 		o if link is disconnected then initiate connection
 *
 * Called by:	Kernel (/usr/src/linux/net/core/dev.c)
 * 		(dev->open())
 *
 * Assumptions: None
 *	
 * Warnings:	None
 *
 * Return: 	0 	Ok
 * 		<0 	Failure: Interface will not come up.
 */

static int if_open(struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	struct timeval tv;
	unsigned long smp_flags;
	
	if (netif_running(dev))
		return -EBUSY;

	chan->tq_working = 0;

	/* Initialize the workqueue */
	INIT_WORK(&chan->common.wanpipe_work, (void *)x25api_bh, dev);

	/* Allocate and initialize BH circular buffer */
	/* Add 1 to MAX_BH_BUFF so we don't have test with (MAX_BH_BUFF-1) */
	chan->bh_head = kmalloc((sizeof(bh_data_t)*(MAX_BH_BUFF+1)),GFP_ATOMIC);

	if (chan->bh_head == NULL){
		printk(KERN_INFO "%s: ERROR, failed to allocate memory ! BH_BUFFERS !\n",
				card->devname);

		return -ENOBUFS;
	}
	memset(chan->bh_head,0,(sizeof(bh_data_t)*(MAX_BH_BUFF+1)));
	atomic_set(&chan->bh_buff_used, 0);

	/* Increment the number of interfaces */
	++card->u.x.no_dev;
	
	wanpipe_open(card);

	/* LAPB protocol only uses one interface, thus
	 * start the protocol after it comes up. */
	if (card->u.x.LAPB_hdlc){
		if (card->open_cnt == 1){
			TX25Status* status = card->flags;
			S508_S514_lock(card, &smp_flags);
			x25_set_intr_mode(card, INTR_ON_TIMER); 
			status->imask &= ~INTR_ON_TIMER;
			S508_S514_unlock(card, &smp_flags);
		}
	}else{
		/* X25 can have multiple interfaces thus, start the 
		 * protocol once all interfaces are up */

		//FIXME: There is a bug here. If interface is
		//brought down and up, it will try to enable comm.
		if (card->open_cnt == card->u.x.num_of_ch){

			S508_S514_lock(card, &smp_flags);
			connect(card);
			S508_S514_unlock(card, &smp_flags);

			mod_timer(&card->u.x.x25_timer, jiffies + HZ);
		}
	}
	/* Device is not up until the we are in connected state */
	do_gettimeofday( &tv );
	chan->router_start_time = tv.tv_sec;

	netif_start_queue(dev);

	return 0;
}

/*===================================================================
 * Name:	if_close(),   Close/Bring down the Netowrk Interface 
 *
 * Purpose:	To bring down a network interface.
 * 
 * Rationale:	
 *                
 * Description:	Close network interface.
 * 		o decrement use module use count
 *
 * Called by:	Kernel (/usr/src/linux/net/core/dev.c)
 * 		(dev->close())
 *		ifconfig <name> down: will trigger the kernel
 *              which will call this function.
 *
 * Assumptions: None
 *	
 * Warnings:	None
 *
 * Return: 	0 	Ok
 * 		<0 	Failure: Interface will not exit properly.
 */
static int if_close(struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	unsigned long smp_flags;
	
	netif_stop_queue(dev);

	if ((chan->common.state == WAN_CONNECTED) || 
	    (chan->common.state == WAN_CONNECTING)){
		S508_S514_lock(card, &smp_flags);
		chan_disc(dev);
		S508_S514_unlock(card, &smp_flags);
	}

	wanpipe_close(card);

	S508_S514_lock(card, &smp_flags);
	if (chan->bh_head){
		int i;
		struct sk_buff *skb;
	
		for (i=0; i<(MAX_BH_BUFF+1); i++){
			skb = ((bh_data_t *)&chan->bh_head[i])->skb;
			if (skb != NULL){
                		dev_kfree_skb_any(skb);
			}
		}
		kfree(chan->bh_head);
		chan->bh_head=NULL;
	}
	S508_S514_unlock(card, &smp_flags);

	/* If this is the last close, disconnect physical link */
	if (!card->open_cnt){
		S508_S514_lock(card, &smp_flags);
		disconnect(card);
		x25_set_intr_mode(card, 0);
		S508_S514_unlock(card, &smp_flags);
	}
	
	/* Decrement the number of interfaces */
	--card->u.x.no_dev;
	return 0;
}

/*======================================================================
 * 	Build media header.
 * 	o encapsulate packet according to encapsulation type.
 *
 * 	The trick here is to put packet type (Ethertype) into 'protocol' 
 *      field of the socket buffer, so that we don't forget it.  
 *      If encapsulation fails, set skb->protocol to 0 and discard 
 *      packet later.
 *
 * 	Return:		media header length.
 *======================================================================*/

static int if_header(struct sk_buff* skb, struct net_device* dev,
		     unsigned short type, void* daddr, void* saddr,
		     unsigned len)
{
	x25_channel_t* chan = dev->priv;
	int hdr_len = dev->hard_header_len;
	
	skb->protocol = htons(type);
	if (!chan->protocol){
		hdr_len = wanrouter_encapsulate(skb, dev, type);
		if (hdr_len < 0){
			hdr_len = 0;
			skb->protocol = htons(0);
		}
	}
	return hdr_len;
}

/*===============================================================
 * 	Re-build media header.
 *
 * 	Return:		1	physical address resolved.
 *			0	physical address not resolved
 *==============================================================*/

static int if_rebuild_hdr (struct sk_buff* skb)
{
	struct net_device *dev = skb->dev; 
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;

	printk(KERN_INFO "%s: rebuild_header() called for interface %s!\n",
		card->devname, dev->name);
	return 1;
}


/*============================================================================
 * Handle transmit timeout event from netif watchdog
 */
static void if_tx_timeout(struct net_device *dev)
{
    	x25_channel_t* chan = dev->priv;
	sdla_t *card = chan->card;

	/* If our device stays busy for at least 5 seconds then we will
	 * kick start the device by making dev->tbusy = 0.  We expect
	 * that our device never stays busy more than 5 seconds. So this                 
	 * is only used as a last resort.
	 */

	++chan->if_send_stat.if_send_tbusy_timeout;
	printk (KERN_INFO "%s: Transmit timed out on %s\n", 
			card->devname, dev->name);
	netif_wake_queue (dev);
}


/*=========================================================================
 * 	Send a packet on a network interface.
 * 	o set tbusy flag (marks start of the transmission).
 * 	o check link state. If link is not up, then drop the packet.
 * 	o check channel status. If it's down then initiate a call.
 * 	o pass a packet to corresponding WAN device.
 * 	o free socket buffer
 *
 * 	Return:	0	complete (socket buffer must be freed)
 *		non-0	packet may be re-transmitted (tbusy must be set)
 *
 * 	Notes:
 * 	1. This routine is called either by the protocol stack or by the "net
 *    	bottom half" (with interrupts enabled).
 * 	2. Setting tbusy flag will inhibit further transmit requests from the
 *    	protocol stack and can be used for flow control with protocol layer.
 *
 *========================================================================*/

static int if_send(struct sk_buff* skb, struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	TX25Status* status = card->flags;
	int udp_type;
	unsigned long smp_flags=0;

	++chan->if_send_stat.if_send_entry;

	netif_stop_queue(dev);

	/* No need to check frame length, since socket code
         * will perform the check for us */

	chan->tick_counter = jiffies;
	
	/* Critical region starts here */
	S508_S514_lock(card, &smp_flags);
	
	if (test_and_set_bit(SEND_CRIT, (void*)&card->wandev.critical)){
		printk(KERN_INFO "Hit critical in if_send()! %lx\n",card->wandev.critical);
		goto if_send_crit_exit;
	}
	
	udp_type = udp_pkt_type(skb, card);

        if(udp_type != UDP_INVALID_TYPE) {

                if(store_udp_mgmt_pkt(udp_type, UDP_PKT_FRM_STACK, card, dev, skb,
                        chan->common.lcn)) {

                        status->imask |= INTR_ON_TIMER;
                        if (udp_type == UDP_XPIPE_TYPE){
                                chan->if_send_stat.if_send_PIPE_request++;
			}
               	}
		netif_start_queue(dev);
		clear_bit(SEND_CRIT,(void*)&card->wandev.critical);
		S508_S514_unlock(card, &smp_flags);
		return 0;
	}

	if (chan->transmit_length){
		//FIXME: This check doesn't make sense any more
		if (chan->common.state != WAN_CONNECTED){
			chan->transmit_length=0;
			atomic_set(&chan->common.driver_busy,0);
		}else{
			netif_stop_queue(dev);
			++card->u.x.tx_interrupts_pending;
		        status->imask |= INTR_ON_TX_FRAME;
			clear_bit(SEND_CRIT,(void*)&card->wandev.critical);
			S508_S514_unlock(card, &smp_flags);
			return 1;
		}
	}

	if (card->wandev.state != WAN_CONNECTED){
		++chan->ifstats.tx_dropped;
		++card->wandev.stats.tx_dropped;
		++chan->if_send_stat.if_send_wan_disconnected;	
		
	}else if ( chan->protocol && (chan->protocol != skb->protocol)){
		printk(KERN_INFO
			"%s: unsupported Ethertype 0x%04X on interface %s!\n",
			chan->name, htons(skb->protocol), dev->name);
		
		printk(KERN_INFO "PROTO %Xn", htons(chan->protocol));
		++chan->ifstats.tx_errors;
		++chan->ifstats.tx_dropped;
		++card->wandev.stats.tx_dropped;
		++chan->if_send_stat.if_send_protocol_error;
		
	}else switch (chan->common.state){

		case WAN_DISCONNECTED:
			/* Try to establish connection. If succeded, then start
			 * transmission, else drop a packet.
			 */
			if (chan->common.usedby == API){
				++chan->ifstats.tx_dropped;
				++card->wandev.stats.tx_dropped;
				break;
			}else{
				if (chan_connect(dev) != 0){
					++chan->ifstats.tx_dropped;
					++card->wandev.stats.tx_dropped;
					break;
				}
			}
			/* fall through */

		case WAN_CONNECTED:
			if( skb->protocol == htons(ETH_P_IPX)) {
				if(chan->enable_IPX) {
					switch_net_numbers( skb->data, 
						chan->network_number, 0);
				} else {
					++card->wandev.stats.tx_dropped;
					++chan->ifstats.tx_dropped;
					++chan->if_send_stat.if_send_protocol_error;
					goto if_send_crit_exit;
				}
			}
			/* We never drop here, if cannot send than, copy
	                 * a packet into a transmit buffer 
                         */
			chan_send(dev, skb->data, skb->len, 0);
			break;

		default:
			++chan->ifstats.tx_dropped;	
			++card->wandev.stats.tx_dropped;
			break;
	}


if_send_crit_exit:
	
       	dev_kfree_skb_any(skb);

	netif_start_queue(dev);
	clear_bit(SEND_CRIT,(void*)&card->wandev.critical);
	S508_S514_unlock(card, &smp_flags);
	return 0;
}

/*============================================================================
 * Setup so that a frame can be transmitted on the occurrence of a transmit
 * interrupt.
 *===========================================================================*/

static void setup_for_delayed_transmit(struct net_device* dev, void* buf,
				       unsigned len)
{
        x25_channel_t* chan = dev->priv;
        sdla_t* card = chan->card;
	TX25Status* status = card->flags;

	++chan->if_send_stat.if_send_adptr_bfrs_full;

        if(chan->transmit_length) {
                printk(KERN_INFO "%s: Error, transmit length set in delayed transmit!\n",
				card->devname);
                return;
        }

	if (chan->common.usedby == API){
		if (len > X25_CHAN_MTU+sizeof(x25api_hdr_t)) {
			++chan->ifstats.tx_dropped;	
			++card->wandev.stats.tx_dropped;
			printk(KERN_INFO "%s: Length is too big for delayed transmit\n",
				card->devname);
			return;
		}
	}else{
		if (len > X25_MAX_DATA) {
			++chan->ifstats.tx_dropped;	
			++card->wandev.stats.tx_dropped;
			printk(KERN_INFO "%s: Length is too big for delayed transmit\n",
				card->devname);
			return;
		}
	}

        chan->transmit_length = len;
	atomic_set(&chan->common.driver_busy,1);
        memcpy(chan->transmit_buffer, buf, len);

	++chan->if_send_stat.if_send_tx_int_enabled;

	/* Enable Transmit Interrupt */
	++card->u.x.tx_interrupts_pending;
        status->imask |= INTR_ON_TX_FRAME;
}


/*===============================================================
 * net_device_stats
 *
 * 	Get ethernet-style interface statistics.
 * 	Return a pointer to struct enet_statistics.
 *
 *==============================================================*/
static struct net_device_stats *if_stats(struct net_device* dev)
{
	x25_channel_t *chan = dev->priv;

	if(chan == NULL)
		return NULL;

	return &chan->ifstats;
}


/*
 *	Interrupt Handlers 
 */

/*
 * X.25 Interrupt Service Routine.
 */

static void wpx_isr (sdla_t* card)
{
	TX25Status* status = card->flags;

	card->in_isr = 1;
	++card->statistics.isr_entry;

	if (test_bit(PERI_CRIT,(void*)&card->wandev.critical)){
		card->in_isr=0;
		status->iflags = 0;
		return;
	}
	
	if (test_bit(SEND_CRIT, (void*)&card->wandev.critical)){

 		printk(KERN_INFO "%s: wpx_isr: wandev.critical set to 0x%02lx, int type = 0x%02x\n", 
			card->devname, card->wandev.critical, status->iflags);
		card->in_isr = 0;
		status->iflags = 0;
		return;
	}

	/* For all interrupts set the critical flag to CRITICAL_RX_INTR.
         * If the if_send routine is called with this flag set it will set
         * the enable transmit flag to 1. (for a delayed interrupt)
         */
	switch (status->iflags){

		case RX_INTR_PENDING:		/* receive interrupt */
			rx_intr(card);
			break;

		case TX_INTR_PENDING:		/* transmit interrupt */
			tx_intr(card);
			break;

		case MODEM_INTR_PENDING:	/* modem status interrupt */
			status_intr(card);
			break;

		case X25_ASY_TRANS_INTR_PENDING:	/* network event interrupt */
			event_intr(card);
			break;

		case TIMER_INTR_PENDING:
			timer_intr(card);
			break;

		default:		/* unwanted interrupt */
			spur_intr(card);
	}

	card->in_isr = 0;
	status->iflags = 0;	/* clear interrupt condition */
}

/*
 * 	Receive interrupt handler.
 * 	This routine handles fragmented IP packets using M-bit according to the
 * 	RFC1356.
 * 	o map ligical channel number to network interface.
 * 	o allocate socket buffer or append received packet to the existing one.
 * 	o if M-bit is reset (i.e. it's the last packet in a sequence) then 
 *   	decapsulate packet and pass socket buffer to the protocol stack.
 *
 * 	Notes:
 * 	1. When allocating a socket buffer, if M-bit is set then more data is
 *    	coming and we have to allocate buffer for the maximum IP packet size
 *    	expected on this channel.
 * 	2. If something goes wrong and X.25 packet has to be dropped (e.g. no
 *    	socket buffers available) the whole packet sequence must be discarded.
 */

static void rx_intr (sdla_t* card)
{
	TX25Mbox* rxmb = card->rxmb;
	unsigned lcn = rxmb->cmd.lcn;
	struct net_device* dev = find_channel(card,lcn);
	x25_channel_t* chan;
	struct sk_buff* skb=NULL;

	if (dev == NULL){
		/* Invalid channel, discard packet */
		printk(KERN_INFO "%s: receiving on orphaned LCN %d!\n",
			card->devname, lcn);
		return;
	}

	chan = dev->priv;
	chan->i_timeout_sofar = jiffies;


	/* Copy the data from the board, into an
         * skb buffer 
	 */
	if (wanpipe_pull_data_in_skb(card,dev,&skb)){
		++chan->ifstats.rx_dropped;
		++card->wandev.stats.rx_dropped;
		++chan->rx_intr_stat.rx_intr_no_socket;
		++chan->rx_intr_stat.rx_intr_bfr_not_passed_to_stack;
		return;
	}

	dev->last_rx = jiffies;		/* timestamp */


	/* ------------ API ----------------*/

	if (chan->common.usedby == API){

		if (bh_enqueue(dev, skb)){
			++chan->ifstats.rx_dropped;
			++card->wandev.stats.rx_dropped;
			++chan->rx_intr_stat.rx_intr_bfr_not_passed_to_stack;
			dev_kfree_skb_any(skb);
			return;
		}		

		++chan->ifstats.rx_packets;
		chan->ifstats.rx_bytes += skb->len;
		

		chan->rx_skb = NULL;
		if (!test_and_set_bit(0, &chan->tq_working)){
			wanpipe_queue_work(&chan->common.wanpipe_work);
		}
		return;
	}


	/* ------------- WANPIPE -------------------*/
	
	/* set rx_skb to NULL so we won't access it later when kernel already owns it */
	chan->rx_skb=NULL;
	
	/* Decapsulate packet, if necessary */
	if (!skb->protocol && !wanrouter_type_trans(skb, dev)){
		/* can't decapsulate packet */
                dev_kfree_skb_any(skb);
		++chan->ifstats.rx_errors;
		++chan->ifstats.rx_dropped;
		++card->wandev.stats.rx_dropped;
		++chan->rx_intr_stat.rx_intr_bfr_not_passed_to_stack;

	}else{
		if( handle_IPXWAN(skb->data, chan->name, 
				  chan->enable_IPX, chan->network_number, 
				  skb->protocol)){

			if( chan->enable_IPX ){
				if(chan_send(dev, skb->data, skb->len,0)){
					chan->tx_skb = skb;
				}else{
                                        dev_kfree_skb_any(skb);
					++chan->rx_intr_stat.rx_intr_bfr_not_passed_to_stack;
				}
			}else{
				/* increment IPX packet dropped statistic */
				++chan->ifstats.rx_dropped;
				++chan->rx_intr_stat.rx_intr_bfr_not_passed_to_stack;
			}
		}else{
			skb->mac.raw = skb->data;
			chan->ifstats.rx_bytes += skb->len;
			++chan->ifstats.rx_packets;
			++chan->rx_intr_stat.rx_intr_bfr_passed_to_stack;
			netif_rx(skb);
		}
	}
	
	return;
}


static int wanpipe_pull_data_in_skb(sdla_t *card, struct net_device *dev,
				    struct sk_buff **skb)
{
	void *bufptr;
	TX25Mbox* rxmb = card->rxmb;
	unsigned len = rxmb->cmd.length;	/* packet length */
	unsigned qdm = rxmb->cmd.qdm;		/* Q,D and M bits */
	x25_channel_t *chan = dev->priv;
	struct sk_buff *new_skb = *skb;

	if (chan->common.usedby == WANPIPE){
		if (chan->drop_sequence){
			if (!(qdm & 0x01)){ 
				chan->drop_sequence = 0;
			}
			return 1;
		}
		new_skb = chan->rx_skb;
	}else{
		/* Add on the API header to the received
                 * data 
		 */
		len += sizeof(x25api_hdr_t);
	}

	if (new_skb == NULL){
		int bufsize;

		if (chan->common.usedby == WANPIPE){
			bufsize = (qdm & 0x01) ? dev->mtu : len;
		}else{
			bufsize = len;
		}

		/* Allocate new socket buffer */
		new_skb = dev_alloc_skb(bufsize + dev->hard_header_len);
		if (new_skb == NULL){
			printk(KERN_INFO "%s: no socket buffers available!\n",
				card->devname);
			chan->drop_sequence = 1;	/* set flag */
			++chan->ifstats.rx_dropped;
			return 1;
		}
	}

	if (skb_tailroom(new_skb) < len){
		/* No room for the packet. Call off the whole thing! */
                dev_kfree_skb_any(new_skb);
		if (chan->common.usedby == WANPIPE){
			chan->rx_skb = NULL;
			if (qdm & 0x01){ 
				chan->drop_sequence = 1;
			}
		}

		printk(KERN_INFO "%s: unexpectedly long packet sequence "
			"on interface %s!\n", card->devname, dev->name);
		++chan->ifstats.rx_length_errors;
		return 1;
	}

	bufptr = skb_put(new_skb,len);


	if (chan->common.usedby == API){
		/* Fill in the x25api header 
		 */
		x25api_t * api_data = (x25api_t*)bufptr;
		api_data->hdr.qdm = rxmb->cmd.qdm;
		api_data->hdr.cause = rxmb->cmd.cause;
		api_data->hdr.diagn = rxmb->cmd.diagn;
		api_data->hdr.length = rxmb->cmd.length;
		memcpy(api_data->data, rxmb->data, rxmb->cmd.length);
	}else{
		memcpy(bufptr, rxmb->data, len);
	}

	new_skb->dev = dev;

	if (chan->common.usedby == API){
		new_skb->mac.raw = new_skb->data;
		new_skb->protocol = htons(X25_PROT);
		new_skb->pkt_type = WAN_PACKET_DATA;
	}else{
		new_skb->protocol = chan->protocol;
		chan->rx_skb = new_skb;
	}

	/* If qdm bit is set, more data is coming 
         * thus, exit and wait for more data before
         * sending the packet up. (Used by router only) 
	 */
	if ((qdm & 0x01) && (chan->common.usedby == WANPIPE)) 
		return 1;	

	*skb = new_skb; 

	return 0;
}

/*===============================================================
 * tx_intr
 *  
 * 	Transmit interrupt handler.
 *	For each dev, check that there is something to send.
 *	If data available, transmit. 	
 *
 *===============================================================*/

static void tx_intr (sdla_t* card)
{
	struct net_device *dev;
	TX25Status* status = card->flags;
	unsigned char more_to_tx=0;
	x25_channel_t *chan=NULL;
	int i=0;	

	if (card->u.x.tx_dev == NULL){
		card->u.x.tx_dev = card->wandev.dev;
	}

	dev = card->u.x.tx_dev;

	for (;;){

		chan = dev->priv;
		if (chan->transmit_length){
			/* Device was set to transmit, check if the TX
                         * buffers are available 
			 */		
			if (chan->common.state != WAN_CONNECTED){
				chan->transmit_length = 0;
				atomic_set(&chan->common.driver_busy,0);
				chan->tx_offset=0;
				if (netif_queue_stopped(dev)){
					if (chan->common.usedby == API){
						netif_start_queue(dev);
						wakeup_sk_bh(dev);
					}else{
						netif_wake_queue(dev);
					}
				}
				dev = move_dev_to_next(card,dev);
				break;
			}				

			if ((status->cflags[chan->ch_idx] & 0x40 || card->u.x.LAPB_hdlc) && 
			     (*card->u.x.hdlc_buf_status & 0x40) ){
				/* Tx buffer available, we can send */
				
				if (tx_intr_send(card, dev)){
					more_to_tx=1;
				}

				/* If more than one interface present, move the
                                 * device pointer to the next interface, so on the 
                                 * next TX interrupt we will try sending from it. 
                                 */
				dev = move_dev_to_next(card,dev);
				break;
			}else{
				/* Tx buffers not available, but device set
                                 * the TX interrupt.  Set more_to_tx and try  
                                 * to transmit for other devices.
				 */
				more_to_tx=1;
				dev = move_dev_to_next(card,dev);
			}

		}else{
			/* This device was not set to transmit,
                         * go to next 
			 */
			dev = move_dev_to_next(card,dev);
		}	

		if (++i == card->u.x.no_dev){
			if (!more_to_tx){
				DBG_PRINTK(KERN_INFO "%s: Nothing to Send in TX INTR\n",
					card->devname);
			}
			break;
		}

	} //End of FOR

	card->u.x.tx_dev = dev;
	
	if (!more_to_tx){
		/* if any other interfaces have transmit interrupts pending, */
		/* do not disable the global transmit interrupt */
		if (!(--card->u.x.tx_interrupts_pending)){
			status->imask &= ~INTR_ON_TX_FRAME;
		}
	}
	return;
}

/*===============================================================
 * move_dev_to_next
 *  
 *
 *===============================================================*/


struct net_device *move_dev_to_next(sdla_t *card, struct net_device *dev)
{
	if (card->u.x.no_dev != 1){
		if (!*((struct net_device **)dev->priv))
			return card->wandev.dev;
		else
			return *((struct net_device **)dev->priv);
	}
	return dev;
}

/*===============================================================
 *  tx_intr_send
 *  
 *
 *===============================================================*/

static int tx_intr_send(sdla_t *card, struct net_device *dev)
{
	x25_channel_t* chan = dev->priv; 

	if (chan_send (dev,chan->transmit_buffer,chan->transmit_length,1)){
		 
                /* Packet was split up due to its size, do not disable
                 * tx_intr 
                 */
		return 1;
	}

	chan->transmit_length=0;
	atomic_set(&chan->common.driver_busy,0);
	chan->tx_offset=0;

	/* If we are in API mode, wakeup the 
         * sock BH handler, not the NET_BH */
	if (netif_queue_stopped(dev)){
		if (chan->common.usedby == API){
			netif_start_queue(dev);
			wakeup_sk_bh(dev);
		}else{
			netif_wake_queue(dev);
		}
	}
	return 0;
}


/*===============================================================
 * timer_intr
 *  
 * 	Timer interrupt handler.
 *	Check who called the timer interrupt and perform
 *      action accordingly.
 *
 *===============================================================*/

static void timer_intr (sdla_t *card)
{
	TX25Status* status = card->flags;

	if (card->u.x.timer_int_enabled & TMR_INT_ENABLED_CMD_EXEC){

		if (timer_intr_cmd_exec(card) == 0){
			card->u.x.timer_int_enabled &=
				~TMR_INT_ENABLED_CMD_EXEC;
		}

	}else  if(card->u.x.timer_int_enabled & TMR_INT_ENABLED_UDP_PKT) {

		if ((*card->u.x.hdlc_buf_status & 0x40) && 
		    card->u.x.udp_type == UDP_XPIPE_TYPE){

                    	if(process_udp_mgmt_pkt(card)) {
		                card->u.x.timer_int_enabled &= 
					~TMR_INT_ENABLED_UDP_PKT;
			}
		}

	}else if (card->u.x.timer_int_enabled & TMR_INT_ENABLED_POLL_ACTIVE) {

		struct net_device *dev = card->u.x.poll_device;
		x25_channel_t *chan = NULL;

		if (!dev){
			card->u.x.timer_int_enabled &= ~TMR_INT_ENABLED_POLL_ACTIVE;
			return;
		}
		chan = dev->priv;

		printk(KERN_INFO 
			"%s: Closing down Idle link %s on LCN %d\n",
					card->devname,chan->name,chan->common.lcn); 
		chan->i_timeout_sofar = jiffies;
		chan_disc(dev);	
         	card->u.x.timer_int_enabled &= ~TMR_INT_ENABLED_POLL_ACTIVE;
		card->u.x.poll_device=NULL;

	}else if (card->u.x.timer_int_enabled & TMR_INT_ENABLED_POLL_CONNECT_ON) {

		wanpipe_set_state(card, WAN_CONNECTED);
		if (card->u.x.LAPB_hdlc){
			struct net_device *dev = card->wandev.dev;
			set_chan_state(dev,WAN_CONNECTED);
			send_delayed_cmd_result(card,dev,card->mbox);	
		}

		/* 0x8F enable all interrupts */
		x25_set_intr_mode(card, INTR_ON_RX_FRAME|	
					INTR_ON_TX_FRAME|
					INTR_ON_MODEM_STATUS_CHANGE|
					//INTR_ON_COMMAND_COMPLETE|
					X25_ASY_TRANS_INTR_PENDING |
					INTR_ON_TIMER |
					DIRECT_RX_INTR_USAGE
				); 

		status->imask &= ~INTR_ON_TX_FRAME;	/* mask Tx interrupts */
		card->u.x.timer_int_enabled &= ~TMR_INT_ENABLED_POLL_CONNECT_ON;

	}else if (card->u.x.timer_int_enabled & TMR_INT_ENABLED_POLL_CONNECT_OFF) {

		//printk(KERN_INFO "Poll connect, Turning OFF\n");
		disconnect(card);
		card->u.x.timer_int_enabled &= ~TMR_INT_ENABLED_POLL_CONNECT_OFF;

	}else if (card->u.x.timer_int_enabled & TMR_INT_ENABLED_POLL_DISCONNECT) {

		//printk(KERN_INFO "POll disconnect, trying to connect\n");
		connect(card);
		card->u.x.timer_int_enabled &= ~TMR_INT_ENABLED_POLL_DISCONNECT;

	}else if (card->u.x.timer_int_enabled & TMR_INT_ENABLED_UPDATE){

		if (*card->u.x.hdlc_buf_status & 0x40){
			x25_get_err_stats(card);
			x25_get_stats(card);
			card->u.x.timer_int_enabled &= ~TMR_INT_ENABLED_UPDATE;
		}
	}

	if(!card->u.x.timer_int_enabled){
		//printk(KERN_INFO "Turning Timer Off \n");
                status->imask &= ~INTR_ON_TIMER;	
	}
}

/*====================================================================
 * 	Modem status interrupt handler.
 *===================================================================*/
static void status_intr (sdla_t* card)
{

	/* Added to avoid Modem status message flooding */
	static TX25ModemStatus last_stat;

	TX25Mbox* mbox = card->mbox;
	TX25ModemStatus *modem_status;
	struct net_device *dev;
	x25_channel_t *chan;
	int err;

	memset(&mbox->cmd, 0, sizeof(TX25Cmd));
	mbox->cmd.command = X25_READ_MODEM_STATUS;
	err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	if (err){ 
		x25_error(card, err, X25_READ_MODEM_STATUS, 0);
	}else{
	
		modem_status = (TX25ModemStatus*)mbox->data;	
	
           	/* Check if the last status was the same
           	 * if it was, do NOT print message again */
	
		if (last_stat.status != modem_status->status){

	     		printk(KERN_INFO "%s: Modem Status Change: DCD=%s, CTS=%s\n",
				card->devname,DCD(modem_status->status),CTS(modem_status->status));

			last_stat.status = modem_status->status;
		
			if (card->u.x.oob_on_modem){

				mbox->cmd.pktType = mbox->cmd.command;
				mbox->cmd.result = 0x08;

				/* Send a OOB to all connected sockets */
				for (dev = card->wandev.dev; dev;
				     dev = *((struct net_device**)dev->priv)) {
					chan=dev->priv;
					if (chan->common.usedby == API){
						send_oob_msg(card,dev,mbox);				
					}
				}

				/* The modem OOB message will probably kill the
				 * the link. If we don't clear the flag here,
				 * a deadlock could occur */ 
				if (atomic_read(&card->u.x.command_busy)){
					atomic_set(&card->u.x.command_busy,0);
				}
			}
		}
	}

	memset(&mbox->cmd, 0, sizeof(TX25Cmd));
	mbox->cmd.command = X25_HDLC_LINK_STATUS;
	err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	if (err){ 
		x25_error(card, err, X25_HDLC_LINK_STATUS, 0);
	}

}

/*====================================================================
 * 	Network event interrupt handler.
 *===================================================================*/
static void event_intr (sdla_t* card)
{
	x25_fetch_events(card);
}

/*====================================================================
 * 	Spurious interrupt handler.
 * 	o print a warning
 * 	o	 
 *====================================================================*/

static void spur_intr (sdla_t* card)
{
	printk(KERN_INFO "%s: spurious interrupt!\n", card->devname);
}


/*
 *	Background Polling Routines  
 */

/*====================================================================
 * 	Main polling routine.
 * 	This routine is repeatedly called by the WANPIPE 'thread' to allow for
 * 	time-dependent housekeeping work.
 *
 * 	Notes:
 * 	1. This routine may be called on interrupt context with all interrupts
 *    	enabled. Beware!
 *====================================================================*/

static void wpx_poll (sdla_t *card)
{
	if (!card->wandev.dev){
		goto wpx_poll_exit;
	}

	if (card->open_cnt != card->u.x.num_of_ch){
		goto wpx_poll_exit;
	}
	
	if (test_bit(PERI_CRIT,&card->wandev.critical)){
		goto wpx_poll_exit;
	}

	if (test_bit(SEND_CRIT,&card->wandev.critical)){
		goto wpx_poll_exit;
	}

	switch(card->wandev.state){
		case WAN_CONNECTED:
			poll_active(card);
			break;

		case WAN_CONNECTING:
			poll_connecting(card);
			break;

		case WAN_DISCONNECTED:
			poll_disconnected(card);
			break;
	}

wpx_poll_exit:
	clear_bit(POLL_CRIT,&card->wandev.critical);
	return;
}

static void trigger_x25_poll(sdla_t *card)
{
	schedule_work(&card->u.x.x25_poll_work);
}

/*====================================================================
 * 	Handle physical link establishment phase.
 * 	o if connection timed out, disconnect the link.
 *===================================================================*/

static void poll_connecting (sdla_t* card)
{
	volatile TX25Status* status = card->flags;

	if (status->gflags & X25_HDLC_ABM){

		timer_intr_exec (card, TMR_INT_ENABLED_POLL_CONNECT_ON);

	}else if ((jiffies - card->state_tick) > CONNECT_TIMEOUT){

		timer_intr_exec (card, TMR_INT_ENABLED_POLL_CONNECT_OFF);

	}
}

/*====================================================================
 * 	Handle physical link disconnected phase.
 * 	o if hold-down timeout has expired and there are open interfaces, 
 *	connect link.
 *===================================================================*/

static void poll_disconnected (sdla_t* card)
{
	struct net_device *dev; 
	x25_channel_t *chan;
	TX25Status* status = card->flags;

	if (!card->u.x.LAPB_hdlc && card->open_cnt && 
	    ((jiffies - card->state_tick) > HOLD_DOWN_TIME)){
		timer_intr_exec(card, TMR_INT_ENABLED_POLL_DISCONNECT);
	}


	if ((dev=card->wandev.dev) == NULL)
		return;

	if ((chan=dev->priv) == NULL)
		return;

	if (chan->common.usedby == API && 
	    atomic_read(&chan->common.command) && 
	    card->u.x.LAPB_hdlc){

		if (!(card->u.x.timer_int_enabled & TMR_INT_ENABLED_CMD_EXEC)) 
			card->u.x.timer_int_enabled |= TMR_INT_ENABLED_CMD_EXEC;

		if (!(status->imask & INTR_ON_TIMER))
			status->imask |= INTR_ON_TIMER;
	}	

}

/*====================================================================
 * 	Handle active link phase.
 * 	o fetch X.25 asynchronous events.
 * 	o kick off transmission on all interfaces.
 *===================================================================*/

static void poll_active (sdla_t* card)
{
	struct net_device* dev;
	TX25Status* status = card->flags;

	for (dev = card->wandev.dev; dev;
	     dev = *((struct net_device **)dev->priv)){
		x25_channel_t* chan = dev->priv;

		/* If SVC has been idle long enough, close virtual circuit */
		if ( chan->common.svc && 
		     chan->common.state == WAN_CONNECTED &&
		     chan->common.usedby == WANPIPE ){
		
			if( (jiffies - chan->i_timeout_sofar) / HZ > chan->idle_timeout ){
				/* Close svc */
				card->u.x.poll_device=dev;
				timer_intr_exec	(card, TMR_INT_ENABLED_POLL_ACTIVE);
			}
		}

#ifdef PRINT_DEBUG
		chan->ifstats.tx_compressed = atomic_read(&chan->common.command);
		chan->ifstats.tx_errors = chan->common.state;
		chan->ifstats.rx_fifo_errors = atomic_read(&card->u.x.command_busy);
		++chan->ifstats.tx_bytes;

		chan->ifstats.rx_fifo_errors=atomic_read(&chan->common.disconnect);
		chan->ifstats.multicast=atomic_read(&chan->bh_buff_used);
		chan->ifstats.rx_length_errors=*card->u.x.hdlc_buf_status;
#endif	

		if (chan->common.usedby == API && 
		    atomic_read(&chan->common.command) && 
	            !card->u.x.LAPB_hdlc){

			if (!(card->u.x.timer_int_enabled & TMR_INT_ENABLED_CMD_EXEC)) 
				card->u.x.timer_int_enabled |= TMR_INT_ENABLED_CMD_EXEC;

			if (!(status->imask & INTR_ON_TIMER))
				status->imask |= INTR_ON_TIMER;
		}	

		if ((chan->common.usedby == API) && 
		     atomic_read(&chan->common.disconnect)){

			if (chan->common.state == WAN_DISCONNECTED){
				atomic_set(&chan->common.disconnect,0);
				return;
			}

			atomic_set(&chan->common.command,X25_CLEAR_CALL);
			if (!(card->u.x.timer_int_enabled & TMR_INT_ENABLED_CMD_EXEC)) 
				card->u.x.timer_int_enabled |= TMR_INT_ENABLED_CMD_EXEC;

			if (!(status->imask & INTR_ON_TIMER))
				status->imask |= INTR_ON_TIMER;
		}
	}
}

static void timer_intr_exec(sdla_t *card, unsigned char TYPE)
{
	TX25Status* status = card->flags;
	card->u.x.timer_int_enabled |= TYPE;
	if (!(status->imask & INTR_ON_TIMER))
		status->imask |= INTR_ON_TIMER;
}


/*==================================================================== 
 * SDLA Firmware-Specific Functions 
 *
 *  Almost all X.25 commands can unexpetedly fail due to so called 'X.25
 *  asynchronous events' such as restart, interrupt, incoming call request,
 *  call clear request, etc.  They can't be ignored and have to be delt with
 *  immediately.  To tackle with this problem we execute each interface 
 *  command in a loop until good return code is received or maximum number 
 *  of retries is reached.  Each interface command returns non-zero return 
 *  code, an asynchronous event/error handler x25_error() is called.
 *====================================================================*/

/*====================================================================
 * 	Read X.25 firmware version.
 *		Put code version as ASCII string in str. 
 *===================================================================*/

static int x25_get_version (sdla_t* card, char* str)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.command = X25_READ_CODE_VERSION;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- &&
		 x25_error(card, err, X25_READ_CODE_VERSION, 0));

	if (!err && str)
	{
		int len = mbox->cmd.length;

		memcpy(str, mbox->data, len);
		str[len] = '\0';
	}
	return err;
}

/*====================================================================
 * 	Configure adapter.
 *===================================================================*/

static int x25_configure (sdla_t* card, TX25Config* conf)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		memcpy(mbox->data, (void*)conf, sizeof(TX25Config));
		mbox->cmd.length  = sizeof(TX25Config);
		mbox->cmd.command = X25_SET_CONFIGURATION;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_SET_CONFIGURATION, 0));
	return err;
}

/*====================================================================
 * 	Configure adapter for HDLC only.
 *===================================================================*/

static int hdlc_configure (sdla_t* card, TX25Config* conf)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		memcpy(mbox->data, (void*)conf, sizeof(TX25Config));
		mbox->cmd.length  = sizeof(TX25Config);
		mbox->cmd.command = X25_HDLC_SET_CONFIG;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_SET_CONFIGURATION, 0));

	return err;
}

static int set_hdlc_level (sdla_t* card)
{

	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.command = SET_PROTOCOL_LEVEL;
		mbox->cmd.length = 1;
		mbox->data[0] = HDLC_LEVEL; //| DO_HDLC_LEVEL_ERROR_CHECKING; 	
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, SET_PROTOCOL_LEVEL, 0));

	return err;
}



/*====================================================================
 * Get communications error statistics.
 *====================================================================*/

static int x25_get_err_stats (sdla_t* card)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.command = X25_HDLC_READ_COMM_ERR;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_HDLC_READ_COMM_ERR, 0));
	
	if (!err)
	{
		THdlcCommErr* stats = (void*)mbox->data;

		card->wandev.stats.rx_over_errors    = stats->rxOverrun;
		card->wandev.stats.rx_crc_errors     = stats->rxBadCrc;
		card->wandev.stats.rx_missed_errors  = stats->rxAborted;
		card->wandev.stats.tx_aborted_errors = stats->txAborted;
	}
	return err;
}

/*====================================================================
 * 	Get protocol statistics.
 *===================================================================*/

static int x25_get_stats (sdla_t* card)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.command = X25_READ_STATISTICS;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_READ_STATISTICS, 0)) ;
	
	if (!err)
	{
		TX25Stats* stats = (void*)mbox->data;

		card->wandev.stats.rx_packets = stats->rxData;
		card->wandev.stats.tx_packets = stats->txData;
	}
	return err;
}

/*====================================================================
 * 	Close HDLC link.
 *===================================================================*/

static int x25_close_hdlc (sdla_t* card)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.command = X25_HDLC_LINK_CLOSE;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_HDLC_LINK_CLOSE, 0));
	
	return err;
}


/*====================================================================
 * 	Open HDLC link.
 *===================================================================*/

static int x25_open_hdlc (sdla_t* card)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.command = X25_HDLC_LINK_OPEN;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_HDLC_LINK_OPEN, 0));

	return err;
}

/*=====================================================================
 * Setup HDLC link.
 *====================================================================*/
static int x25_setup_hdlc (sdla_t* card)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.command = X25_HDLC_LINK_SETUP;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_HDLC_LINK_SETUP, 0));
	
	return err;
}

/*====================================================================
 * Set (raise/drop) DTR.
 *===================================================================*/

static int x25_set_dtr (sdla_t* card, int dtr)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->data[0] = 0;
		mbox->data[2] = 0;
		mbox->data[1] = dtr ? 0x02 : 0x01;
		mbox->cmd.length  = 3;
		mbox->cmd.command = X25_SET_GLOBAL_VARS;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_SET_GLOBAL_VARS, 0));
	
	return err;
}

/*====================================================================
 * 	Set interrupt mode.
 *===================================================================*/

static int x25_set_intr_mode (sdla_t* card, int mode)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->data[0] = mode;
		if (card->hw.fwid == SFID_X25_508){
			mbox->data[1] = card->hw.irq;
			mbox->data[2] = 2;
			mbox->cmd.length = 3;
		}else {
		 	mbox->cmd.length  = 1;
		}
		mbox->cmd.command = X25_SET_INTERRUPT_MODE;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_SET_INTERRUPT_MODE, 0));
	
	return err;
}

/*====================================================================
 * 	Read X.25 channel configuration.
 *===================================================================*/

static int x25_get_chan_conf (sdla_t* card, x25_channel_t* chan)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int lcn = chan->common.lcn;
	int err;

	do{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.lcn     = lcn;
		mbox->cmd.command = X25_READ_CHANNEL_CONFIG;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_READ_CHANNEL_CONFIG, lcn));

	if (!err)
	{
		TX25Status* status = card->flags;

		/* calculate an offset into the array of status bytes */
		if (card->u.x.hi_svc <= X25_MAX_CHAN){ 

			chan->ch_idx = lcn - 1;

		}else{
			int offset;

			/* FIX: Apr 14 2000 : Nenad Corbic
			 * The data field was being compared to 0x1F using
                         * '&&' instead of '&'. 
			 * This caused X25API to fail for LCNs greater than 255.
			 */
			switch (mbox->data[0] & 0x1F)
			{
				case 0x01: 
					offset = status->pvc_map; break;
				case 0x03: 
					offset = status->icc_map; break;
				case 0x07: 
					offset = status->twc_map; break;
				case 0x0B: 
					offset = status->ogc_map; break;
				default: 
					offset = 0;
			}
			chan->ch_idx = lcn - 1 - offset;
		}

		/* get actual transmit packet size on this channel */
		switch(mbox->data[1] & 0x38)
		{
			case 0x00: 
				chan->tx_pkt_size = 16; 
				break;
			case 0x08: 
				chan->tx_pkt_size = 32; 
				break;
			case 0x10: 
				chan->tx_pkt_size = 64; 
				break;
			case 0x18: 
				chan->tx_pkt_size = 128; 
				break;
			case 0x20: 
				chan->tx_pkt_size = 256; 
				break;
			case 0x28: 
				chan->tx_pkt_size = 512; 
				break;
			case 0x30: 
				chan->tx_pkt_size = 1024; 
				break;
		}
		if (card->u.x.logging)
			printk(KERN_INFO "%s: X.25 packet size on LCN %d is %d.\n",
				card->devname, lcn, chan->tx_pkt_size);
	}
	return err;
}

/*====================================================================
 * 	Place X.25 call.
 *====================================================================*/

static int x25_place_call (sdla_t* card, x25_channel_t* chan)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;
	char str[64];


	if (chan->protocol == htons(ETH_P_IP)){
		sprintf(str, "-d%s -uCC", chan->addr);
	
	}else if (chan->protocol == htons(ETH_P_IPX)){
		sprintf(str, "-d%s -u800000008137", chan->addr);
	
	}
	
	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		strcpy(mbox->data, str);
		mbox->cmd.length  = strlen(str);
		mbox->cmd.command = X25_PLACE_CALL;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_PLACE_CALL, 0));

	if (!err){
		bind_lcn_to_dev (card, chan->dev, mbox->cmd.lcn);
	}
	return err;
}

/*====================================================================
 * 	Accept X.25 call.
 *====================================================================*/

static int x25_accept_call (sdla_t* card, int lcn, int qdm)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.lcn     = lcn;
		mbox->cmd.qdm     = qdm;
		mbox->cmd.command = X25_ACCEPT_CALL;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_ACCEPT_CALL, lcn));
	
	return err;
}

/*====================================================================
 * 	Clear X.25 call.
 *====================================================================*/

static int x25_clear_call (sdla_t* card, int lcn, int cause, int diagn)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.lcn     = lcn;
		mbox->cmd.cause   = cause;
		mbox->cmd.diagn   = diagn;
		mbox->cmd.command = X25_CLEAR_CALL;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, X25_CLEAR_CALL, lcn));
	
	return err;
}

/*====================================================================
 * 	Send X.25 data packet.
 *====================================================================*/

static int x25_send (sdla_t* card, int lcn, int qdm, int len, void* buf)
{
	TX25Mbox* mbox = card->mbox;
  	int retry = MAX_CMD_RETRY;
	int err;
	unsigned char cmd;
		
	if (card->u.x.LAPB_hdlc)
		cmd = X25_HDLC_WRITE;
	else
		cmd = X25_WRITE;

	do
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		memcpy(mbox->data, buf, len);
		mbox->cmd.length  = len;
		mbox->cmd.lcn     = lcn;

		if (card->u.x.LAPB_hdlc){
			mbox->cmd.pf = qdm;
		}else{			
			mbox->cmd.qdm = qdm;
		}

		mbox->cmd.command = cmd;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	} while (err && retry-- && x25_error(card, err, cmd , lcn));


	/* If buffers are busy the return code for LAPB HDLC is
         * 1. The above functions are looking for return code
         * of X25RES_NOT_READY if busy. */

	if (card->u.x.LAPB_hdlc && err == 1){
		err = X25RES_NOT_READY;
	}

	return err;
}

/*====================================================================
 * 	Fetch X.25 asynchronous events.
 *===================================================================*/

static int x25_fetch_events (sdla_t* card)
{
	TX25Status* status = card->flags;
	TX25Mbox* mbox = card->mbox;
	int err = 0;

	if (status->gflags & 0x20)
	{
		memset(&mbox->cmd, 0, sizeof(TX25Cmd));
		mbox->cmd.command = X25_IS_DATA_AVAILABLE;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
 		if (err) x25_error(card, err, X25_IS_DATA_AVAILABLE, 0);
	}
	return err;
}

/*====================================================================
 * 	X.25 asynchronous event/error handler.
 *		This routine is called each time interface command returns 
 *		non-zero return code to handle X.25 asynchronous events and 
 *		common errors. Return non-zero to repeat command or zero to 
 *		cancel it.
 *
 * 	Notes:
 * 	1. This function may be called recursively, as handling some of the
 *    	asynchronous events (e.g. call request) requires execution of the
 *    	interface command(s) that, in turn, may also return asynchronous
 *    	events.  To avoid re-entrancy problems we copy mailbox to dynamically
 *    	allocated memory before processing events.
 *====================================================================*/

static int x25_error (sdla_t* card, int err, int cmd, int lcn)
{
	int retry = 1;
	unsigned dlen = ((TX25Mbox*)card->mbox)->cmd.length;
	TX25Mbox* mb;

	mb = kmalloc(sizeof(TX25Mbox) + dlen, GFP_ATOMIC);
	if (mb == NULL)
	{
		printk(KERN_ERR "%s: x25_error() out of memory!\n",
			card->devname);
		return 0;
	}
	memcpy(mb, card->mbox, sizeof(TX25Mbox) + dlen);
	switch (err){

	case X25RES_ASYNC_PACKET:	/* X.25 asynchronous packet was received */

		mb->data[dlen] = '\0';

		switch (mb->cmd.pktType & 0x7F){

		case ASE_CALL_RQST:		/* incoming call */
			retry = incoming_call(card, cmd, lcn, mb);
			break;

		case ASE_CALL_ACCEPTED:		/* connected */
			retry = call_accepted(card, cmd, lcn, mb);
			break;

		case ASE_CLEAR_RQST:		/* call clear request */
			retry = call_cleared(card, cmd, lcn, mb);
			break;

		case ASE_RESET_RQST:		/* reset request */
			printk(KERN_INFO "%s: X.25 reset request on LCN %d! "
				"Cause:0x%02X Diagn:0x%02X\n",
				card->devname, mb->cmd.lcn, mb->cmd.cause,
				mb->cmd.diagn);
			api_oob_event (card,mb);
			break;

		case ASE_RESTART_RQST:		/* restart request */
			retry = restart_event(card, cmd, lcn, mb);
			break;

		case ASE_CLEAR_CONFRM:
			if (clear_confirm_event (card,mb))
				break;

			/* I use the goto statement here so if 
	                 * somebody inserts code between the
        	         * case and default, we will not have
                	 * ghost problems */

			goto dflt_1;

		default:
dflt_1:
			printk(KERN_INFO "%s: X.25 event 0x%02X on LCN %d! "
				"Cause:0x%02X Diagn:0x%02X\n",
				card->devname, mb->cmd.pktType,
				mb->cmd.lcn, mb->cmd.cause, mb->cmd.diagn);
		}
		break;

	case X25RES_PROTO_VIOLATION:	/* X.25 protocol violation indication */

		/* Bug Fix: Mar 14 2000
                 * The Protocol violation error conditions were  
                 * not handled previously */

		switch (mb->cmd.pktType & 0x7F){

		case PVE_CLEAR_RQST:	/* Clear request */		
			retry = call_cleared(card, cmd, lcn, mb);
			break;	

		case PVE_RESET_RQST:	/* Reset request */
			printk(KERN_INFO "%s: X.25 reset request on LCN %d! "
				"Cause:0x%02X Diagn:0x%02X\n",
				card->devname, mb->cmd.lcn, mb->cmd.cause,
				mb->cmd.diagn);
			api_oob_event (card,mb);
			break;

		case PVE_RESTART_RQST:	/* Restart request */
			retry = restart_event(card, cmd, lcn, mb);
			break;

		default :
			printk(KERN_INFO
				"%s: X.25 protocol violation on LCN %d! "
				"Packet:0x%02X Cause:0x%02X Diagn:0x%02X\n",
				card->devname, mb->cmd.lcn,
				mb->cmd.pktType & 0x7F, mb->cmd.cause, mb->cmd.diagn);
			api_oob_event(card,mb);
		}
		break;

	case 0x42:	/* X.25 timeout */
		retry = timeout_event(card, cmd, lcn, mb);
		break;

	case 0x43:	/* X.25 retry limit exceeded */
		printk(KERN_INFO
			"%s: exceeded X.25 retry limit on LCN %d! "
			"Packet:0x%02X Diagn:0x%02X\n", card->devname,
			mb->cmd.lcn, mb->cmd.pktType, mb->cmd.diagn)
		;
		break;

	case 0x08:	/* modem failure */
#ifndef MODEM_NOT_LOG
		printk(KERN_INFO "%s: modem failure!\n", card->devname);
#endif /* MODEM_NOT_LOG */
		api_oob_event(card,mb);
		break;

	case 0x09:	/* N2 retry limit */
		printk(KERN_INFO "%s: exceeded HDLC retry limit!\n",
			card->devname);
		api_oob_event(card,mb);
		break;

	case 0x06:	/* unnumbered frame was received while in ABM */
		printk(KERN_INFO "%s: received Unnumbered frame 0x%02X!\n",
			card->devname, mb->data[0]);
		api_oob_event(card,mb);
		break;

	case CMD_TIMEOUT:
		printk(KERN_ERR "%s: command 0x%02X timed out!\n",
			card->devname, cmd)
		;
		retry = 0;	/* abort command */
		break;

	case X25RES_NOT_READY:
		retry = 1;
		break;

	case 0x01:
		if (card->u.x.LAPB_hdlc)
			break;

		if (mb->cmd.command == 0x16)
			break;
		/* I use the goto statement here so if 
                 * somebody inserts code between the
                 * case and default, we will not have
                 * ghost problems */
		goto dflt_2;

	default:
dflt_2:
		printk(KERN_INFO "%s: command 0x%02X returned 0x%02X! Lcn %i\n",
			card->devname, cmd, err, mb->cmd.lcn)
		;
		retry = 0;	/* abort command */
	}
	kfree(mb);
	return retry;
}

/*==================================================================== 
 *	X.25 Asynchronous Event Handlers
 * 	These functions are called by the x25_error() and should return 0, if
 * 	the command resulting in the asynchronous event must be aborted.
 *====================================================================*/



/*====================================================================
 *Handle X.25 incoming call request.
 *	RFC 1356 establishes the following rules:
 *	1. The first octet in the Call User Data (CUD) field of the call
 *     	   request packet contains NLPID identifying protocol encapsulation
 * 	2. Calls MUST NOT be accepted unless router supports requested
 *   	   protocol encapsulation.
 *	3. A diagnostic code 249 defined by ISO/IEC 8208 may be used 
 *	   when clearing a call because protocol encapsulation is not 
 *	   supported.
 *	4. If an incoming call is received while a call request is 
 *	   pending (i.e. call collision has occurred), the incoming call 
 *	   shall be rejected and call request shall be retried.
 *====================================================================*/

static int incoming_call (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
{
	struct wan_device* wandev = &card->wandev;
	int new_lcn = mb->cmd.lcn;
	struct net_device* dev = get_dev_by_lcn(wandev, new_lcn);
	x25_channel_t* chan = NULL;
	int accept = 0;		/* set to '1' if o.k. to accept call */
	unsigned int user_data;
	x25_call_info_t* info;
	
	/* Make sure there is no call collision */
	if (dev != NULL)
	{
		printk(KERN_INFO
			"%s: X.25 incoming call collision on LCN %d!\n",
			card->devname, new_lcn);

		x25_clear_call(card, new_lcn, 0, 0);
		return 1;
	}

	/* Make sure D bit is not set in call request */
//FIXME: THIS IS NOT TURE !!!! TAKE IT OUT
//	if (mb->cmd.qdm & 0x02)
//	{
//		printk(KERN_INFO
//			"%s: X.25 incoming call on LCN %d with D-bit set!\n",
//			card->devname, new_lcn);
//
//		x25_clear_call(card, new_lcn, 0, 0);
//		return 1;
//	}

	/* Parse call request data */
	info = kmalloc(sizeof(x25_call_info_t), GFP_ATOMIC);
	if (info == NULL)
	{
		printk(KERN_ERR
			"%s: not enough memory to parse X.25 incoming call "
			"on LCN %d!\n", card->devname, new_lcn);
		x25_clear_call(card, new_lcn, 0, 0);
		return 1;
	}
 
	parse_call_info(mb->data, info);

	if (card->u.x.logging)
		printk(KERN_INFO "\n%s: X.25 incoming call on LCN %d!\n",
			card->devname, new_lcn);

	/* Conver the first two ASCII characters into an
         * interger. Used to check the incoming protocol 
         */
	user_data = hex_to_uint(info->user,2);

	/* Find available channel */
	for (dev = wandev->dev; dev; dev = *((struct net_device **)dev->priv)) {
		chan = dev->priv;

		if (chan->common.usedby == API)
			continue;

		if (!chan->common.svc || (chan->common.state != WAN_DISCONNECTED))
			continue;

		if (user_data == NLPID_IP && chan->protocol != htons(ETH_P_IP)){
			printk(KERN_INFO "IP packet but configured for IPX : %x, %x\n",
				       htons(chan->protocol), info->user[0]);
			continue;
		}
	
		if (user_data == NLPID_SNAP && chan->protocol != htons(ETH_P_IPX)){
			printk(KERN_INFO "IPX packet but configured for IP: %x\n",
				       htons(chan->protocol));
			continue;
		}
		if (strcmp(info->src, chan->addr) == 0)
			break;

	        /* If just an '@' is specified, accept all incoming calls */
	        if (strcmp(chan->addr, "") == 0)
	                break;
	}

	if (dev == NULL){

		/* If the call is not for any WANPIPE interfaces
                 * check to see if there is an API listening queue
                 * waiting for data. If there is send the packet
                 * up the stack.
                 */
		if (card->sk != NULL && card->func != NULL){
			if (api_incoming_call(card,mb,new_lcn)){
				x25_clear_call(card, new_lcn, 0, 0);
			}
			accept = 0;
		}else{
			printk(KERN_INFO "%s: no channels available!\n",
				card->devname);
			
			x25_clear_call(card, new_lcn, 0, 0);
		}

	}else if (info->nuser == 0){

		printk(KERN_INFO
			"%s: no user data in incoming call on LCN %d!\n",
			card->devname, new_lcn)
		;
		x25_clear_call(card, new_lcn, 0, 0);

	}else switch (info->user[0]){

		case 0:		/* multiplexed */
			chan->protocol = htons(0);
			accept = 1;
			break;

		case NLPID_IP:	/* IP datagrams */
			accept = 1;
			break;

		case NLPID_SNAP: /* IPX datagrams */
			accept = 1;
			break;

		default:
			printk(KERN_INFO
				"%s: unsupported NLPID 0x%02X in incoming call "
				"on LCN %d!\n", card->devname, info->user[0], new_lcn);
			x25_clear_call(card, new_lcn, 0, 249);
	}
	
	if (accept && (x25_accept_call(card, new_lcn, 0) == CMD_OK)){

		bind_lcn_to_dev (card, chan->dev, new_lcn);
		
		if (x25_get_chan_conf(card, chan) == CMD_OK)
			set_chan_state(dev, WAN_CONNECTED);
		else 
			x25_clear_call(card, new_lcn, 0, 0);
	}
	kfree(info);
	return 1;
}

/*====================================================================
 * 	Handle accepted call.
 *====================================================================*/

static int call_accepted (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
{
	unsigned new_lcn = mb->cmd.lcn;
	struct net_device* dev = find_channel(card, new_lcn);
	x25_channel_t* chan;

	if (dev == NULL){
		printk(KERN_INFO
			"%s: clearing orphaned connection on LCN %d!\n",
			card->devname, new_lcn);
		x25_clear_call(card, new_lcn, 0, 0);
		return 1;
	}

	if (card->u.x.logging)	
		printk(KERN_INFO "%s: X.25 call accepted on Dev %s and LCN %d!\n",
			card->devname, dev->name, new_lcn);

	/* Get channel configuration and notify router */
	chan = dev->priv;
	if (x25_get_chan_conf(card, chan) != CMD_OK)
	{
		x25_clear_call(card, new_lcn, 0, 0);
		return 1;
	}

	set_chan_state(dev, WAN_CONNECTED);

	if (chan->common.usedby == API){
		send_delayed_cmd_result(card,dev,mb);
		bind_lcn_to_dev (card, dev, new_lcn);
	}

	return 1;
}

/*====================================================================
 * 	Handle cleared call.
 *====================================================================*/

static int call_cleared (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
{
	unsigned new_lcn = mb->cmd.lcn;
	struct net_device* dev = find_channel(card, new_lcn);
	x25_channel_t *chan;
	unsigned char old_state;

	if (card->u.x.logging){
		printk(KERN_INFO "%s: X.25 clear request on LCN %d! Cause:0x%02X "
		"Diagn:0x%02X\n",
		card->devname, new_lcn, mb->cmd.cause, mb->cmd.diagn);
	}

	if (dev == NULL){ 
		printk(KERN_INFO "%s: X.25 clear request : No device for clear\n",
				card->devname);
		return 1;
	}

	chan=dev->priv;

	old_state = chan->common.state;

	set_chan_state(dev, WAN_DISCONNECTED);

	if (chan->common.usedby == API){

		switch (old_state){
		
		case WAN_CONNECTING:
			send_delayed_cmd_result(card,dev,mb);
			break;
		case WAN_CONNECTED:
			send_oob_msg(card,dev,mb);				
			break;
		}
	}
	
	return ((cmd == X25_WRITE) && (lcn == new_lcn)) ? 0 : 1;
}

/*====================================================================
 * 	Handle X.25 restart event.
 *====================================================================*/

static int restart_event (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
{
	struct wan_device* wandev = &card->wandev;
	struct net_device* dev;
	x25_channel_t *chan;
	unsigned char old_state;

	printk(KERN_INFO
		"%s: X.25 restart request! Cause:0x%02X Diagn:0x%02X\n",
		card->devname, mb->cmd.cause, mb->cmd.diagn);

	/* down all logical channels */
	for (dev = wandev->dev; dev; dev = *((struct net_device **)dev->priv)) {
		chan=dev->priv;
		old_state = chan->common.state;

		set_chan_state(dev, WAN_DISCONNECTED);

		if (chan->common.usedby == API){
			switch (old_state){
		
			case WAN_CONNECTING:
				send_delayed_cmd_result(card,dev,mb);
				break;
			case WAN_CONNECTED:
				send_oob_msg(card,dev,mb);				
				break;
			}
		}
	}
	return (cmd == X25_WRITE) ? 0 : 1;
}

/*====================================================================
 * Handle timeout event.
 *====================================================================*/

static int timeout_event (sdla_t* card, int cmd, int lcn, TX25Mbox* mb)
{
	unsigned new_lcn = mb->cmd.lcn;

	if (mb->cmd.pktType == 0x05)	/* call request time out */
	{
		struct net_device* dev = find_channel(card,new_lcn);

		printk(KERN_INFO "%s: X.25 call timed timeout on LCN %d!\n",
			card->devname, new_lcn);

		if (dev){
			x25_channel_t *chan = dev->priv;
			set_chan_state(dev, WAN_DISCONNECTED);

			if (chan->common.usedby == API){
				send_delayed_cmd_result(card,dev,card->mbox);
			}
		}
	}else{ 
		printk(KERN_INFO "%s: X.25 packet 0x%02X timeout on LCN %d!\n",
		card->devname, mb->cmd.pktType, new_lcn);
	}
	return 1;
}

/* 
 *	Miscellaneous 
 */

/*====================================================================
 * 	Establish physical connection.
 * 	o open HDLC and raise DTR
 *
 * 	Return:		0	connection established
 *			1	connection is in progress
 *			<0	error
 *===================================================================*/

static int connect (sdla_t* card)
{
	TX25Status* status = card->flags;

	if (x25_open_hdlc(card) || x25_setup_hdlc(card))
		return -EIO;

	wanpipe_set_state(card, WAN_CONNECTING);

	x25_set_intr_mode(card, INTR_ON_TIMER); 
	status->imask &= ~INTR_ON_TIMER;

	return 1;
}

/*
 * 	Tear down physical connection.
 * 	o close HDLC link
 * 	o drop DTR
 *
 * 	Return:		0
 *			<0	error
 */

static int disconnect (sdla_t* card)
{
	wanpipe_set_state(card, WAN_DISCONNECTED);
	x25_set_intr_mode(card, INTR_ON_TIMER);	/* disable all interrupt except timer */
	x25_close_hdlc(card);			/* close HDLC link */
	x25_set_dtr(card, 0);			/* drop DTR */
	return 0;
}

/*
 * Find network device by its channel number.
 */

static struct net_device* get_dev_by_lcn(struct wan_device* wandev,
					 unsigned lcn)
{
	struct net_device* dev;

	for (dev = wandev->dev; dev; dev = *((struct net_device **)dev->priv))
		if (((x25_channel_t*)dev->priv)->common.lcn == lcn) 
			break;
	return dev;
}

/*
 * 	Initiate connection on the logical channel.
 * 	o for PVC we just get channel configuration
 * 	o for SVCs place an X.25 call
 *
 * 	Return:		0	connected
 *			>0	connection in progress
 *			<0	failure
 */

static int chan_connect(struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;

	if (chan->common.svc && chan->common.usedby == WANPIPE){
		if (!chan->addr[0]){
			printk(KERN_INFO "%s: No Destination Address\n",
					card->devname);
			return -EINVAL;	/* no destination address */
		}
		printk(KERN_INFO "%s: placing X.25 call to %s ...\n",
			card->devname, chan->addr);

		if (x25_place_call(card, chan) != CMD_OK)
			return -EIO;

		set_chan_state(dev, WAN_CONNECTING);
		return 1;
	}else{
		if (x25_get_chan_conf(card, chan) != CMD_OK)
			return -EIO;

		set_chan_state(dev, WAN_CONNECTED);
	}
	return 0;
}

/*
 * 	Disconnect logical channel.
 * 	o if SVC then clear X.25 call
 */

static int chan_disc(struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;

	if (chan->common.svc){ 
		x25_clear_call(chan->card, chan->common.lcn, 0, 0);

		/* For API we disconnect on clear
                 * confirmation. 
                 */
		if (chan->common.usedby == API)
			return 0;
	}

	set_chan_state(dev, WAN_DISCONNECTED);
	
	return 0;
}

/*
 * 	Set logical channel state.
 */

static void set_chan_state(struct net_device* dev, int state)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	unsigned long flags;

	save_flags(flags);
	cli();
	if (chan->common.state != state)
	{
		switch (state)
		{
			case WAN_CONNECTED:
				if (card->u.x.logging){
					printk (KERN_INFO 
						"%s: interface %s connected, lcn %i !\n", 
						card->devname, dev->name,chan->common.lcn);
				}
				*(unsigned short*)dev->dev_addr = htons(chan->common.lcn);
				chan->i_timeout_sofar = jiffies;

				/* LAPB is PVC Based */
				if (card->u.x.LAPB_hdlc)
					chan->common.svc=0;
				break;

			case WAN_CONNECTING:
				if (card->u.x.logging){
					printk (KERN_INFO 
						"%s: interface %s connecting, lcn %i ...\n", 
						card->devname, dev->name, chan->common.lcn);
				}
				break;

			case WAN_DISCONNECTED:
				if (card->u.x.logging){
					printk (KERN_INFO 
						"%s: interface %s disconnected, lcn %i !\n", 
						card->devname, dev->name,chan->common.lcn);
				}
				atomic_set(&chan->common.disconnect,0);
				
				if (chan->common.svc) {
					*(unsigned short*)dev->dev_addr = 0;
					card->u.x.svc_to_dev_map[(chan->common.lcn%X25_MAX_CHAN)]=NULL;
		                	chan->common.lcn = 0;
				}

				if (chan->transmit_length){
					chan->transmit_length=0;
					atomic_set(&chan->common.driver_busy,0);
					chan->tx_offset=0;
					if (netif_queue_stopped(dev)){
						netif_wake_queue(dev);
					}
				}
				atomic_set(&chan->common.command,0);
				break;

			case WAN_DISCONNECTING:
				if (card->u.x.logging){
					printk (KERN_INFO 
					"\n%s: interface %s disconnecting, lcn %i ...\n", 
					card->devname, dev->name,chan->common.lcn);
				}
				atomic_set(&chan->common.disconnect,0);
				break;
		}
		chan->common.state = state;
	}
	chan->state_tick = jiffies;
	restore_flags(flags);
}

/*
 * 	Send packet on a logical channel.
 *		When this function is called, tx_skb field of the channel data 
 *		space points to the transmit socket buffer.  When transmission 
 *		is complete, release socket buffer and reset 'tbusy' flag.
 *
 * 	Return:		0	- transmission complete
 *			1	- busy
 *
 * 	Notes:
 * 	1. If packet length is greater than MTU for this channel, we'll fragment
 *    	the packet into 'complete sequence' using M-bit.
 * 	2. When transmission is complete, an event notification should be issued
 *    	to the router.
 */

static int chan_send(struct net_device* dev, void* buff, unsigned data_len,
		     unsigned char tx_intr)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	TX25Status* status = card->flags;
	unsigned len=0, qdm=0, res=0, orig_len = 0;
	void *data;

	/* Check to see if channel is ready */
	if ((!(status->cflags[chan->ch_idx] & 0x40) && !card->u.x.LAPB_hdlc)  || 
             !(*card->u.x.hdlc_buf_status & 0x40)){ 
            
		if (!tx_intr){
			setup_for_delayed_transmit (dev, buff, data_len);
			return 0;
		}else{
			/* By returning 0 to tx_intr the packet will be dropped */
			++card->wandev.stats.tx_dropped;
			++chan->ifstats.tx_dropped;
			printk(KERN_INFO "%s: ERROR, Tx intr could not send, dropping %s:\n", 
				card->devname,dev->name);
			++chan->if_send_stat.if_send_bfr_not_passed_to_adptr;
			return 0;
		}
	}

	if (chan->common.usedby == API){
		/* Remove the API Header */
		x25api_hdr_t *api_data = (x25api_hdr_t *)buff;

		/* Set the qdm bits from the packet header 
                 * User has the option to set the qdm bits
                 */
		qdm = api_data->qdm;

		orig_len = len = data_len - sizeof(x25api_hdr_t);
		data = (unsigned char*)buff + sizeof(x25api_hdr_t);
	}else{
		data = buff;
		orig_len = len = data_len;
	}	

	if (tx_intr){
		/* We are in tx_intr, minus the tx_offset from 
                 * the total length. The tx_offset part of the
		 * data has already been sent. Also, move the 
		 * data pointer to proper offset location.
                 */
		len -= chan->tx_offset;
		data = (unsigned char*)data + chan->tx_offset;
	}
		
	/* Check if the packet length is greater than MTU
         * If YES: Cut the len to MTU and set the M bit 
         */
	if (len > chan->tx_pkt_size && !card->u.x.LAPB_hdlc){
		len = chan->tx_pkt_size;
		qdm |= M_BIT;		
	} 


	/* Pass only first three bits of the qdm byte to the send
         * routine. In case user sets any other bit which might
         * cause errors. 
         */

	switch(x25_send(card, chan->common.lcn, (qdm&0x07), len, data)){
		case 0x00:	/* success */
			chan->i_timeout_sofar = jiffies;

			dev->trans_start=jiffies;
			
			if ((qdm & M_BIT) && !card->u.x.LAPB_hdlc){
				if (!tx_intr){
					/* The M bit was set, which means that part of the
                                         * packet has been sent. Copy the packet into a buffer
				         * and set the offset to len, so on next tx_inter 
					 * the packet will be sent using the below offset.
					 */
					chan->tx_offset += len;

					++chan->ifstats.tx_packets;
					chan->ifstats.tx_bytes += len;
					
					if (chan->tx_offset < orig_len){
						setup_for_delayed_transmit (dev, buff, data_len);
					}
					res=0;
				}else{
					/* We are already in tx_inter, thus data is already
                                         * in the buffer. Update the offset and wait for
                                         * next tx_intr. We add on to the offset, since data can
                                         * be X number of times larger than max data size.
					 */
					++chan->ifstats.tx_packets;
					chan->ifstats.tx_bytes += len;
					
					++chan->if_send_stat.if_send_bfr_passed_to_adptr;
					chan->tx_offset += len;

					/* The user can set the qdm bit as well.
                                         * If the entire packet was sent and qdm is still
                                         * set, than it's the user who has set the M bit. In that,
                                         * case indicate that the packet was send by returning 
					 * 0 and wait for a new packet. Otherwise, wait for next
                                         * tx interrupt to send the rest of the packet */

					if (chan->tx_offset < orig_len){
						res=1;
					}else{	
						res=0;
					}
				}
			}else{
				++chan->ifstats.tx_packets;
				chan->ifstats.tx_bytes += len;
				++chan->if_send_stat.if_send_bfr_passed_to_adptr;
				res=0;
			}
			break;

		case 0x33:	/* Tx busy */
			if (tx_intr){
				printk(KERN_INFO "%s: Tx_intr: Big Error dropping packet %s\n",
						card->devname,dev->name);
				++chan->ifstats.tx_dropped;
				++card->wandev.stats.tx_dropped;
				++chan->if_send_stat.if_send_bfr_not_passed_to_adptr;
				res=0;
			}else{
				DBG_PRINTK(KERN_INFO 
					"%s: Send: Big Error should have tx: storring %s\n",
						card->devname,dev->name);
				setup_for_delayed_transmit (dev, buff, data_len);	
				res=1;
			}
			break;

		default:	/* failure */
			++chan->ifstats.tx_errors;
			if (tx_intr){
				printk(KERN_INFO "%s: Tx_intr: Failure to send, dropping %s\n",
					card->devname,dev->name);
				++chan->ifstats.tx_dropped;
				++card->wandev.stats.tx_dropped;
				++chan->if_send_stat.if_send_bfr_not_passed_to_adptr;
				res=0;
			}else{
				DBG_PRINTK(KERN_INFO "%s: Send: Failure to send !!!, storing %s\n",
					card->devname,dev->name);			
				setup_for_delayed_transmit (dev, buff, data_len);
				res=1;
			}
			break;	
	}
	return res;
}


/*
 * 	Parse X.25 call request data and fill x25_call_info_t structure.
 */

static void parse_call_info (unsigned char* str, x25_call_info_t* info)
{
	memset(info, 0, sizeof(x25_call_info_t));
	for (; *str; ++str)
	{
		int i;
		unsigned char ch;

		if (*str == '-') switch (str[1]) {

			/* Take minus 2 off the maximum size so that 
                         * last byte is 0. This way we can use string
                         * manipulaton functions on call information.
                         */

			case 'd':	/* destination address */
				for (i = 0; i < (MAX_X25_ADDR_SIZE-2); ++i){
					ch = str[2+i];
					if (isspace(ch)) break;
					info->dest[i] = ch;
				}
				break;

			case 's':	/* source address */
				for (i = 0; i < (MAX_X25_ADDR_SIZE-2); ++i){
					ch = str[2+i];
					if (isspace(ch)) break;
					info->src[i] = ch;
				}
				break;

			case 'u':	/* user data */
				for (i = 0; i < (MAX_X25_DATA_SIZE-2); ++i){
					ch = str[2+i];
					if (isspace(ch)) break;
					info->user[i] = ch; 
				}
				info->nuser = i;
				break;

			case 'f':	/* facilities */
				for (i = 0; i < (MAX_X25_FACL_SIZE-2); ++i){
					ch = str[2+i];
					if (isspace(ch)) break;
					info->facil[i] = ch;
				}
				info->nfacil = i;
				break;
		}
	}
}

/*
 * 	Convert line speed in bps to a number used by S502 code.
 */

static unsigned char bps_to_speed_code (unsigned long bps)
{
	unsigned char	number;

	if (bps <= 1200)        number = 0x01;
	else if (bps <= 2400)   number = 0x02;
	else if (bps <= 4800)   number = 0x03;
	else if (bps <= 9600)   number = 0x04;
	else if (bps <= 19200)  number = 0x05;
	else if (bps <= 38400)  number = 0x06;
	else if (bps <= 45000)  number = 0x07;
	else if (bps <= 56000)  number = 0x08;
	else if (bps <= 64000)  number = 0x09;
	else if (bps <= 74000)  number = 0x0A;
	else if (bps <= 112000) number = 0x0B;
	else if (bps <= 128000) number = 0x0C;
	else number = 0x0D;

	return number;
}

/*
 * 	Convert decimal string to unsigned integer.
 * 	If len != 0 then only 'len' characters of the string are converted.
 */

static unsigned int dec_to_uint (unsigned char* str, int len)
{
	unsigned val;

	if (!len) 
		len = strlen(str);

	for (val = 0; len && is_digit(*str); ++str, --len)
		val = (val * 10) + (*str - (unsigned)'0');
	
	return val;
}

/*
 * 	Convert hex string to unsigned integer.
 * 	If len != 0 then only 'len' characters of the string are conferted.
 */

static unsigned int hex_to_uint (unsigned char* str, int len)
{
	unsigned val, ch;

	if (!len) 
		len = strlen(str);

	for (val = 0; len; ++str, --len)
	{
		ch = *str;
		if (is_digit(ch))
			val = (val << 4) + (ch - (unsigned)'0');
		else if (is_hex_digit(ch))
			val = (val << 4) + ((ch & 0xDF) - (unsigned)'A' + 10);
		else break;
	}
	return val;
}


static int handle_IPXWAN(unsigned char *sendpacket, char *devname, unsigned char enable_IPX, unsigned long network_number, unsigned short proto)
{
	int i;

	if( proto == ETH_P_IPX) {
		/* It's an IPX packet */
		if(!enable_IPX) {
			/* Return 1 so we don't pass it up the stack. */
			return 1;
		}
	} else {
		/* It's not IPX so pass it up the stack.*/ 
		return 0;
	}

	if( sendpacket[16] == 0x90 &&
	    sendpacket[17] == 0x04)
	{
		/* It's IPXWAN  */

		if( sendpacket[2] == 0x02 &&
		    sendpacket[34] == 0x00)
		{
			/* It's a timer request packet */
			printk(KERN_INFO "%s: Received IPXWAN Timer Request packet\n",devname);

			/* Go through the routing options and answer no to every
			 * option except Unnumbered RIP/SAP
			 */
			for(i = 41; sendpacket[i] == 0x00; i += 5)
			{
				/* 0x02 is the option for Unnumbered RIP/SAP */
				if( sendpacket[i + 4] != 0x02)
				{
					sendpacket[i + 1] = 0;
				}
			}

			/* Skip over the extended Node ID option */
			if( sendpacket[i] == 0x04 )
			{
				i += 8;
			}

			/* We also want to turn off all header compression opt. 			 */ 
			for(; sendpacket[i] == 0x80 ;)
			{
				sendpacket[i + 1] = 0;
				i += (sendpacket[i + 2] << 8) + (sendpacket[i + 3]) + 4;
			}

			/* Set the packet type to timer response */
			sendpacket[34] = 0x01;

			printk(KERN_INFO "%s: Sending IPXWAN Timer Response\n",devname);
		}
		else if( sendpacket[34] == 0x02 )
		{
			/* This is an information request packet */
			printk(KERN_INFO "%s: Received IPXWAN Information Request packet\n",devname);

			/* Set the packet type to information response */
			sendpacket[34] = 0x03;

			/* Set the router name */
			sendpacket[51] = 'X';
			sendpacket[52] = 'T';
			sendpacket[53] = 'P';
			sendpacket[54] = 'I';
			sendpacket[55] = 'P';
			sendpacket[56] = 'E';
			sendpacket[57] = '-';
			sendpacket[58] = CVHexToAscii(network_number >> 28);
			sendpacket[59] = CVHexToAscii((network_number & 0x0F000000)>> 24);
			sendpacket[60] = CVHexToAscii((network_number & 0x00F00000)>> 20);
			sendpacket[61] = CVHexToAscii((network_number & 0x000F0000)>> 16);
			sendpacket[62] = CVHexToAscii((network_number & 0x0000F000)>> 12);
			sendpacket[63] = CVHexToAscii((network_number & 0x00000F00)>> 8);
			sendpacket[64] = CVHexToAscii((network_number & 0x000000F0)>> 4);
			sendpacket[65] = CVHexToAscii(network_number & 0x0000000F);
			for(i = 66; i < 99; i+= 1)
			{
				sendpacket[i] = 0;
			}

			printk(KERN_INFO "%s: Sending IPXWAN Information Response packet\n",devname);
		}
		else
		{
			printk(KERN_INFO "%s: Unknown IPXWAN packet!\n",devname);
			return 0;
		}

		/* Set the WNodeID to our network address */
		sendpacket[35] = (unsigned char)(network_number >> 24);
		sendpacket[36] = (unsigned char)((network_number & 0x00FF0000) >> 16);
		sendpacket[37] = (unsigned char)((network_number & 0x0000FF00) >> 8);
		sendpacket[38] = (unsigned char)(network_number & 0x000000FF);

		return 1;
	} else {
		/*If we get here it's an IPX-data packet, so it'll get passed up the stack.
		 */
		/* switch the network numbers */
		switch_net_numbers(sendpacket, network_number, 1);	
		return 0;
	}
}

/*
 *  	If incoming is 0 (outgoing)- if the net numbers is ours make it 0
 *  	if incoming is 1 - if the net number is 0 make it ours 
 */

static void switch_net_numbers(unsigned char *sendpacket, unsigned long network_number, unsigned char incoming)
{
	unsigned long pnetwork_number;

	pnetwork_number = (unsigned long)((sendpacket[6] << 24) + 
			  (sendpacket[7] << 16) + (sendpacket[8] << 8) + 
			  sendpacket[9]);
	

	if (!incoming) {
		/*If the destination network number is ours, make it 0 */
		if( pnetwork_number == network_number) {
			sendpacket[6] = sendpacket[7] = sendpacket[8] = 
					 sendpacket[9] = 0x00;
		}
	} else {
		/* If the incoming network is 0, make it ours */
		if( pnetwork_number == 0) {
			sendpacket[6] = (unsigned char)(network_number >> 24);
			sendpacket[7] = (unsigned char)((network_number & 
					 0x00FF0000) >> 16);
			sendpacket[8] = (unsigned char)((network_number & 
					 0x0000FF00) >> 8);
			sendpacket[9] = (unsigned char)(network_number & 
					 0x000000FF);
		}
	}


	pnetwork_number = (unsigned long)((sendpacket[18] << 24) + 
			  (sendpacket[19] << 16) + (sendpacket[20] << 8) + 
			  sendpacket[21]);
	
	
	if( !incoming ) {
		/* If the source network is ours, make it 0 */
		if( pnetwork_number == network_number) {
			sendpacket[18] = sendpacket[19] = sendpacket[20] = 
				 sendpacket[21] = 0x00;
		}
	} else {
		/* If the source network is 0, make it ours */
		if( pnetwork_number == 0 ) {
			sendpacket[18] = (unsigned char)(network_number >> 24);
			sendpacket[19] = (unsigned char)((network_number & 
					 0x00FF0000) >> 16);
			sendpacket[20] = (unsigned char)((network_number & 
					 0x0000FF00) >> 8);
			sendpacket[21] = (unsigned char)(network_number & 
					 0x000000FF);
		}
	}
} /* switch_net_numbers */




/********************* X25API SPECIFIC FUNCTIONS ****************/


/*===============================================================
 *  find_channel
 *
 *	Manages the lcn to device map. It increases performance
 *      because it eliminates the need to search through the link  
 *      list for a device which is bounded to a specific lcn.
 *
 *===============================================================*/


struct net_device *find_channel(sdla_t *card, unsigned lcn)
{
	if (card->u.x.LAPB_hdlc){

		return card->wandev.dev;

	}else{
		/* We don't know whether the incoming lcn
                 * is a PVC or an SVC channel. But we do know that
                 * the lcn cannot be for both the PVC and the SVC
                 * channel.

		 * If the lcn number is greater or equal to 255, 
                 * take the modulo 255 of that number. We only have
                 * 255 locations, thus higher numbers must be mapped
                 * to a number between 0 and 245. 

		 * We must separate pvc's and svc's since two don't
                 * have to be contiguous.  Meaning pvc's can start
                 * from 1 to 10 and svc's can start from 256 to 266.
                 * But 256%255 is 1, i.e. CONFLICT.
		 */


		/* Highest LCN number must be less or equal to 4096 */
		if ((lcn <= MAX_LCN_NUM) && (lcn > 0)){

			if (lcn < X25_MAX_CHAN){
				if (card->u.x.svc_to_dev_map[lcn])
					return card->u.x.svc_to_dev_map[lcn];

				if (card->u.x.pvc_to_dev_map[lcn])
					return card->u.x.pvc_to_dev_map[lcn];
			
			}else{
				int new_lcn = lcn%X25_MAX_CHAN;
				if (card->u.x.svc_to_dev_map[new_lcn])
					return card->u.x.svc_to_dev_map[new_lcn];

				if (card->u.x.pvc_to_dev_map[new_lcn])
					return card->u.x.pvc_to_dev_map[new_lcn];
			}
		}
		return NULL;
	}
}

void bind_lcn_to_dev(sdla_t *card, struct net_device *dev, unsigned lcn)
{
	x25_channel_t *chan = dev->priv;

	/* Modulo the lcn number by X25_MAX_CHAN (255)
	 * because the lcn number can be greater than 255 
         *
	 * We need to split svc and pvc since they don't have
         * to be contigous. 
	 */

	if (chan->common.svc){
		card->u.x.svc_to_dev_map[(lcn % X25_MAX_CHAN)] = dev;
	}else{
		card->u.x.pvc_to_dev_map[(lcn % X25_MAX_CHAN)] = dev;
	}
	chan->common.lcn = lcn;
}



/*===============================================================
 * x25api_bh 
 *
 *
 *==============================================================*/

static void x25api_bh(struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	struct sk_buff *skb;

	if (atomic_read(&chan->bh_buff_used) == 0){
		printk(KERN_INFO "%s: BH Buffer Empty in BH\n",
				card->devname);
		clear_bit(0, &chan->tq_working);
		return;
	}

	while (atomic_read(&chan->bh_buff_used)){

		/* If the sock is in the process of unlinking the
		 * driver from the socket, we must get out. 
		 * This never happends but is a sanity check. */
		if (test_bit(0,&chan->common.common_critical)){
			clear_bit(0, &chan->tq_working);
			return;
		}
		
		/* If LAPB HDLC, do not drop packets if socket is
                 * not connected.  Let the buffer fill up and
                 * turn off rx interrupt */
		if (card->u.x.LAPB_hdlc){
			if (chan->common.sk == NULL || chan->common.func == NULL){
				clear_bit(0, &chan->tq_working);			
				return;
			}
		}

		skb  = ((bh_data_t *)&chan->bh_head[chan->bh_read])->skb;

		if (skb == NULL){
			printk(KERN_INFO "%s: BH Skb empty for read %i\n",
					card->devname,chan->bh_read);
		}else{
			
			if (chan->common.sk == NULL || chan->common.func == NULL){
				printk(KERN_INFO "%s: BH: Socket disconnected, dropping\n",
						card->devname);
				dev_kfree_skb_any(skb);
				x25api_bh_cleanup(dev);
				++chan->ifstats.rx_dropped;
				++chan->rx_intr_stat.rx_intr_bfr_not_passed_to_stack;
				continue;
			}


			if (chan->common.func(skb,dev,chan->common.sk) != 0){
				/* Sock full cannot send, queue us for another
                                 * try 
				 */
				printk(KERN_INFO "%s: BH: !!! Packet failed to send !!!!! \n",
						card->devname);
				atomic_set(&chan->common.receive_block,1);
				return;
			}else{
				x25api_bh_cleanup(dev);
				++chan->rx_intr_stat.rx_intr_bfr_passed_to_stack;
			}
		}
	}	
	clear_bit(0, &chan->tq_working);

	return;
}

/*===============================================================
 * x25api_bh_cleanup 
 *
 *
 *==============================================================*/

static int x25api_bh_cleanup(struct net_device *dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t *card = chan->card;
	TX25Status* status = card->flags;


	((bh_data_t *)&chan->bh_head[chan->bh_read])->skb = NULL;

	if (chan->bh_read == MAX_BH_BUFF){
		chan->bh_read=0;
	}else{
		++chan->bh_read;	
	}

	/* If the Receive interrupt was off, it means
         * that we filled up our circular buffer. Check    
         * that we have space in the buffer. If so 
         * turn the RX interrupt back on. 
	 */
	if (!(status->imask & INTR_ON_RX_FRAME)){
		if (atomic_read(&chan->bh_buff_used) < (MAX_BH_BUFF+1)){
			printk(KERN_INFO "%s: BH: Turning on the interrupt\n",
					card->devname);
			status->imask |= INTR_ON_RX_FRAME;
		}
	}	

	atomic_dec(&chan->bh_buff_used);
	return 0;
}


/*===============================================================
 * bh_enqueue 
 *
 *
 *==============================================================*/

static int bh_enqueue(struct net_device *dev, struct sk_buff *skb)
{
	x25_channel_t* chan = dev->priv;
	sdla_t *card = chan->card;
	TX25Status* status = card->flags;

	if (atomic_read(&chan->bh_buff_used) == (MAX_BH_BUFF+1)){
		printk(KERN_INFO "%s: Bottom half buffer FULL\n",
				card->devname);
		return 1; 
	}

	((bh_data_t *)&chan->bh_head[chan->bh_write])->skb = skb;

	if (chan->bh_write == MAX_BH_BUFF){
		chan->bh_write=0;
	}else{
		++chan->bh_write;
	}

	atomic_inc(&chan->bh_buff_used);

	if (atomic_read(&chan->bh_buff_used) == (MAX_BH_BUFF+1)){
		printk(KERN_INFO "%s: Buffer is now full, Turning off RX Intr\n",
				card->devname);
		status->imask &= ~INTR_ON_RX_FRAME;
	}

	return 0;
}


/*===============================================================
 * timer_intr_cmd_exec
 *  
 *	Called by timer interrupt to execute a command
 *===============================================================*/

static int timer_intr_cmd_exec (sdla_t* card)
{
	struct net_device *dev;
	unsigned char more_to_exec=0;
	volatile x25_channel_t *chan=NULL;
	int i=0,bad_cmd=0,err=0;	

	if (card->u.x.cmd_dev == NULL){
		card->u.x.cmd_dev = card->wandev.dev;
	}

	dev = card->u.x.cmd_dev;

	for (;;){

		chan = dev->priv;
		
		if (atomic_read(&chan->common.command)){ 

			bad_cmd = check_bad_command(card,dev);

			if ((!chan->common.mbox || atomic_read(&chan->common.disconnect)) && 
			     !bad_cmd){

				/* Socket has died or exited, We must bring the
                                 * channel down before anybody else tries to 
                                 * use it */
				err = channel_disconnect(card,dev);
			}else{
			        err = execute_delayed_cmd(card, dev,
							 (mbox_cmd_t*)chan->common.mbox,
							  bad_cmd);
			}

			switch (err){

			case RETURN_RESULT:

				/* Return the result to the socket without
                                 * delay. NO_WAIT Command */	
				atomic_set(&chan->common.command,0);
				if (atomic_read(&card->u.x.command_busy))
					atomic_set(&card->u.x.command_busy,0);

				send_delayed_cmd_result(card,dev,card->mbox);

				more_to_exec=0;
				break;
			case DELAY_RESULT:
		
				/* Wait for the remote to respond, before
                                 * sending the result up to the socket.
                                 * WAIT command */
				if (atomic_read(&card->u.x.command_busy))
					atomic_set(&card->u.x.command_busy,0);
				
				atomic_set(&chan->common.command,0);
				more_to_exec=0;
				break;
			default:

				/* If command could not be executed for
                                 * some reason (i.e return code 0x33 busy)
                                 * set the more_to_exec bit which will
                                 * indicate that this command must be exectued
                                 * again during next timer interrupt 
				 */
				more_to_exec=1;
				if (atomic_read(&card->u.x.command_busy) == 0)
					atomic_set(&card->u.x.command_busy,1);
				break;
			}

			bad_cmd=0;

			/* If flags is set, there are no hdlc buffers,
                         * thus, wait for the next pass and try the
                         * same command again. Otherwise, start searching 
                         * from next device on the next pass. 
			 */
			if (!more_to_exec){
				dev = move_dev_to_next(card,dev);
			}
			break;
		}else{
			/* This device has nothing to execute,
                         * go to next. 
			 */
			if (atomic_read(&card->u.x.command_busy))
					atomic_set(&card->u.x.command_busy,0);
			dev = move_dev_to_next(card,dev);
		}	

		if (++i == card->u.x.no_dev){
			if (!more_to_exec){
				DBG_PRINTK(KERN_INFO "%s: Nothing to execute in Timer\n",
					card->devname);
				if (atomic_read(&card->u.x.command_busy)){
					atomic_set(&card->u.x.command_busy,0);
				}
			}
			break;
		}

	} //End of FOR

	card->u.x.cmd_dev = dev;
	
	if (more_to_exec){
		/* If more commands are pending, do not turn off timer 
                 * interrupt */
		return 1;
	}else{
		/* No more commands, turn off timer interrupt */
		return 0;
	}	
}

/*===============================================================
 * execute_delayed_cmd 
 *
 *	Execute an API command which was passed down from the
 *      sock.  Sock is very limited in which commands it can
 *      execute.  Wait and No Wait commands are supported.  
 *      Place Call, Clear Call and Reset wait commands, where
 *      Accept Call is a no_wait command.
 *
 *===============================================================*/

static int execute_delayed_cmd(sdla_t* card, struct net_device *dev,
			       mbox_cmd_t *usr_cmd, char bad_cmd)
{
	TX25Mbox* mbox = card->mbox;
	int err;
	x25_channel_t *chan = dev->priv;
	int delay=RETURN_RESULT;

	if (!(*card->u.x.hdlc_buf_status & 0x40) && !bad_cmd){
		return TRY_CMD_AGAIN;
	}

	/* This way a command is guaranteed to be executed for
         * a specific lcn, the network interface is bound to. */
	usr_cmd->cmd.lcn = chan->common.lcn;
	

	/* If channel is pvc, instead of place call
         * run x25_channel configuration. If running LAPB HDLC
         * enable communications. 
         */
	if ((!chan->common.svc) && (usr_cmd->cmd.command == X25_PLACE_CALL)){

		if (card->u.x.LAPB_hdlc){
			DBG_PRINTK(KERN_INFO "LAPB: Connecting\n");
			connect(card);
			set_chan_state(dev,WAN_CONNECTING);
			return DELAY_RESULT;
		}else{
			DBG_PRINTK(KERN_INFO "%s: PVC is CONNECTING\n",card->devname);
			if (x25_get_chan_conf(card, chan) == CMD_OK){
				set_chan_state(dev, WAN_CONNECTED);
			}else{ 
				set_chan_state(dev, WAN_DISCONNECTED);
			}
			return RETURN_RESULT;
		}
	}

	/* Copy the socket mbox command onto the board */

	memcpy(&mbox->cmd, &usr_cmd->cmd, sizeof(TX25Cmd));
	if (usr_cmd->cmd.length){
		memcpy(mbox->data, usr_cmd->data, usr_cmd->cmd.length);
	}

	/* Check if command is bad. We need to copy the cmd into
         * the buffer regardless since we return the, mbox to
         * the user */
	if (bad_cmd){
		mbox->cmd.result=0x01;
		return RETURN_RESULT;
	}

	err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;

	if (err != CMD_OK && err != X25RES_NOT_READY)
		x25_error(card, err, usr_cmd->cmd.command, usr_cmd->cmd.lcn);

	if (mbox->cmd.result == X25RES_NOT_READY){
		return TRY_CMD_AGAIN;
	}

	switch (mbox->cmd.command){

	case X25_PLACE_CALL:
		
		switch (mbox->cmd.result){

		case CMD_OK:

			/* Check if Place call is a wait command or a 
               	  	 * no wait command */
			if (atomic_read(&chan->common.command) & 0x80)
 				delay=RETURN_RESULT;
			else
				delay=DELAY_RESULT;
		

			DBG_PRINTK(KERN_INFO "\n%s: PLACE CALL Binding dev %s to lcn %i\n",
					card->devname,dev->name, mbox->cmd.lcn);
		
			bind_lcn_to_dev (card, dev, mbox->cmd.lcn);
			set_chan_state(dev, WAN_CONNECTING);
			break;


		default:
			delay=RETURN_RESULT;
			set_chan_state(dev, WAN_DISCONNECTED);
			break;
		}
		break;

	case X25_ACCEPT_CALL: 
		
		switch (mbox->cmd.result){

		case CMD_OK:

			DBG_PRINTK(KERN_INFO "\n%s: ACCEPT Binding dev %s to lcn %i\n",
				card->devname,dev->name,mbox->cmd.lcn);

			bind_lcn_to_dev (card, dev, mbox->cmd.lcn);

			if (x25_get_chan_conf(card, chan) == CMD_OK){

				set_chan_state(dev, WAN_CONNECTED);
				delay=RETURN_RESULT;

			}else{ 
				if (x25_clear_call(card, usr_cmd->cmd.lcn, 0, 0) == CMD_OK){
					/* if clear is successful, wait for clear confirm 
					 */ 
					delay=DELAY_RESULT;
				}else{
					/* Do not change the state here. If we fail 
					 * the accept the return code is send up 
					 *the stack, which will ether retry
                               	  	 * or clear the call 
					 */
					DBG_PRINTK(KERN_INFO 
						"%s: ACCEPT: STATE MAY BE CURRUPTED 2 !!!!!\n",
						card->devname);
					delay=RETURN_RESULT;
				}
			}
			break;


		case X25RES_ASYNC_PACKET:
			delay=TRY_CMD_AGAIN;
			break;

		default: 
			DBG_PRINTK(KERN_INFO "%s: ACCEPT FAILED\n",card->devname);
			if (x25_clear_call(card, usr_cmd->cmd.lcn, 0, 0) == CMD_OK){
				delay=DELAY_RESULT;
			}else{
				/* Do not change the state here. If we fail the accept. The
                                 * return code is send up the stack, which will ether retry
                                 * or clear the call */
				DBG_PRINTK(KERN_INFO 
					"%s: ACCEPT: STATE MAY BE CORRUPTED 1 !!!!!\n",
						card->devname);
				delay=RETURN_RESULT;
			}
		}
		break;

	case X25_CLEAR_CALL:

		switch (mbox->cmd.result){

		case CMD_OK:
			DBG_PRINTK(KERN_INFO 
					"CALL CLEAR OK: Dev %s Mbox Lcn %i  Chan Lcn %i\n",
					dev->name,mbox->cmd.lcn,chan->common.lcn);
			set_chan_state(dev, WAN_DISCONNECTING);
			delay = DELAY_RESULT;
			break;

		case X25RES_CHANNEL_IN_USE:
		case X25RES_ASYNC_PACKET:
			delay = TRY_CMD_AGAIN;
			break;
			
		case X25RES_LINK_NOT_IN_ABM:
		case X25RES_INVAL_LCN:
		case X25RES_INVAL_STATE:
			set_chan_state(dev, WAN_DISCONNECTED);
			delay = RETURN_RESULT;
			break;
		
		default:
			/* If command did not execute because of user
                         * fault, do not change the state. This will
                         * signal the socket that clear command failed.
                         * User can retry or close the socket.
                         * When socket gets killed, it will set the 
                         * chan->disconnect which will signal
                         * driver to clear the call */
			printk(KERN_INFO "%s: Clear Command Failed, Rc %x\n",
				card->devname,mbox->cmd.command); 
			delay = RETURN_RESULT;
		}
		break;
	}	

	return delay;
}

/*===============================================================
 * api_incoming_call 
 *
 *	Pass an incoming call request up the listening
 *      sock.  If the API sock is not listening reject the
 *      call.
 *
 *===============================================================*/

static int api_incoming_call (sdla_t* card, TX25Mbox *mbox, int lcn)
{
	struct sk_buff *skb;
	int len = sizeof(TX25Cmd)+mbox->cmd.length;

	if (alloc_and_init_skb_buf(card, &skb, len)){
		printk(KERN_INFO "%s: API incoming call, no memory\n",card->devname);
		return 1;
	}

	memcpy(skb_put(skb,len),&mbox->cmd,len);

	skb->mac.raw = skb->data;
	skb->protocol = htons(X25_PROT);
	skb->pkt_type = WAN_PACKET_ASYNC;

	if (card->func(skb,card->sk) < 0){
		printk(KERN_INFO "%s: MAJOR ERROR: Failed to send up place call \n",card->devname);
                dev_kfree_skb_any(skb);
		return 1;
	}

	return 0;
}

/*===============================================================
 * send_delayed_cmd_result
 *
 *	Wait commands like PLEACE CALL or CLEAR CALL must wait
 *      until the result arrives. This function passes
 *      the result to a waiting sock. 
 *
 *===============================================================*/
static void send_delayed_cmd_result(sdla_t *card, struct net_device *dev,
				    TX25Mbox* mbox)
{
	x25_channel_t *chan = dev->priv;
	mbox_cmd_t *usr_cmd = (mbox_cmd_t *)chan->common.mbox;
	struct sk_buff *skb;
	int len=sizeof(unsigned char);

	atomic_set(&chan->common.command,0);

	/* If the sock is in the process of unlinking the
	 * driver from the socket, we must get out. 
	 * This never happends but is a sanity check. */
	if (test_bit(0,&chan->common.common_critical)){
		return;
	}

	if (!usr_cmd || !chan->common.sk || !chan->common.func){
		DBG_PRINTK(KERN_INFO "Delay result: Sock not bounded sk: %u, func: %u, mbox: %u\n",
			(unsigned int)chan->common.sk,
			(unsigned int)chan->common.func,
			(unsigned int)usr_cmd); 
		return;
	}

	memcpy(&usr_cmd->cmd, &mbox->cmd, sizeof(TX25Cmd)); 
	if (mbox->cmd.length > 0){
		memcpy(usr_cmd->data, mbox->data, mbox->cmd.length);
	}

	if (alloc_and_init_skb_buf(card,&skb,len)){
		printk(KERN_INFO "Delay result: No sock buffers\n");
		return;
	}

	memcpy(skb_put(skb,len),&mbox->cmd.command,len);
	
	skb->mac.raw = skb->data;
	skb->pkt_type = WAN_PACKET_CMD;
			
	chan->common.func(skb,dev,chan->common.sk);
}

/*===============================================================
 * clear_confirm_event
 *
 * 	Pass the clear confirmation event up the sock. The
 *      API will disconnect only after the clear confirmation
 *      has been received. 
 *
 *      Depending on the state, clear confirmation could 
 *      be an OOB event, or a result of an API command.
 *===============================================================*/

static int clear_confirm_event (sdla_t *card, TX25Mbox* mb)
{
	struct net_device *dev;
	x25_channel_t *chan;
	unsigned char old_state;	

	dev = find_channel(card,mb->cmd.lcn);
	if (!dev){
		DBG_PRINTK(KERN_INFO "%s: *** GOT CLEAR BUT NO DEV %i\n",
				card->devname,mb->cmd.lcn);
		return 0;
	}

	chan=dev->priv;
	DBG_PRINTK(KERN_INFO "%s: GOT CLEAR CONFIRM %s:  Mbox lcn %i  Chan lcn %i\n",
			card->devname, dev->name, mb->cmd.lcn, chan->common.lcn);

	/* If not API fall through to default. 
	 * If API, send the result to a waiting
         * socket.
	 */
	
	old_state = chan->common.state;
	set_chan_state(dev, WAN_DISCONNECTED);

	if (chan->common.usedby == API){
		switch (old_state) {

		case WAN_DISCONNECTING:
		case WAN_CONNECTING:
			send_delayed_cmd_result(card,dev,mb);
			break;
		case WAN_CONNECTED:
			send_oob_msg(card,dev,mb);
			break;
		}
		return 1;
	}

	return 0;
}

/*===============================================================
 * send_oob_msg
 *
 *    Construct an NEM Message and pass it up the connected
 *    sock. If the sock is not bounded discard the NEM.
 *
 *===============================================================*/

static void send_oob_msg(sdla_t *card, struct net_device *dev, TX25Mbox *mbox)
{
	x25_channel_t *chan = dev->priv;
	mbox_cmd_t *usr_cmd = (mbox_cmd_t *)chan->common.mbox;
	struct sk_buff *skb;
	int len=sizeof(x25api_hdr_t)+mbox->cmd.length;
	x25api_t *api_hdr;

	/* If the sock is in the process of unlinking the
	 * driver from the socket, we must get out. 
	 * This never happends but is a sanity check. */
	if (test_bit(0,&chan->common.common_critical)){
		return;
	}

	if (!usr_cmd || !chan->common.sk || !chan->common.func){
		DBG_PRINTK(KERN_INFO "OOB MSG: Sock not bounded\n"); 
		return;
	}

	memcpy(&usr_cmd->cmd, &mbox->cmd, sizeof(TX25Cmd)); 
	if (mbox->cmd.length > 0){
		memcpy(usr_cmd->data, mbox->data, mbox->cmd.length);
	}

	if (alloc_and_init_skb_buf(card,&skb,len)){
		printk(KERN_INFO "%s: OOB MSG: No sock buffers\n",card->devname);
		return;
	}

	api_hdr = (x25api_t*)skb_put(skb,len); 
	api_hdr->hdr.pktType = mbox->cmd.pktType & 0x7F;
	api_hdr->hdr.qdm     = mbox->cmd.qdm;
	api_hdr->hdr.cause   = mbox->cmd.cause;
	api_hdr->hdr.diagn   = mbox->cmd.diagn;
	api_hdr->hdr.length  = mbox->cmd.length;
	api_hdr->hdr.result  = mbox->cmd.result;
	api_hdr->hdr.lcn     = mbox->cmd.lcn;

	if (mbox->cmd.length > 0){
		memcpy(api_hdr->data,mbox->data,mbox->cmd.length);
	}
	
	skb->mac.raw = skb->data;
	skb->pkt_type = WAN_PACKET_ERR;
			
	if (chan->common.func(skb,dev,chan->common.sk) < 0){
		if (bh_enqueue(dev,skb)){
			printk(KERN_INFO "%s: Dropping OOB MSG\n",card->devname);
                	dev_kfree_skb_any(skb);
		}
	}

	DBG_PRINTK(KERN_INFO "%s: OOB MSG OK, %s, lcn %i\n",
			card->devname, dev->name, mbox->cmd.lcn);
}	

/*===============================================================
 *  alloc_and_init_skb_buf 
 *
 *	Allocate and initialize an skb buffer. 
 *
 *===============================================================*/

static int alloc_and_init_skb_buf (sdla_t *card, struct sk_buff **skb, int len)
{
	struct sk_buff *new_skb = *skb;

	new_skb = dev_alloc_skb(len + X25_HRDHDR_SZ);
	if (new_skb == NULL){
		printk(KERN_INFO "%s: no socket buffers available!\n",
			card->devname);
		return 1;
	}

	if (skb_tailroom(new_skb) < len){
		/* No room for the packet. Call off the whole thing! */
                dev_kfree_skb_any(new_skb);
		printk(KERN_INFO "%s: Listen: unexpectedly long packet sequence\n"
			,card->devname);
		*skb = NULL;
		return 1;
	}

	*skb = new_skb;
	return 0;

}

/*===============================================================
 *  api_oob_event 
 *
 *	Send an OOB event up to the sock 
 *
 *===============================================================*/

static void api_oob_event (sdla_t *card,TX25Mbox *mbox)
{
	struct net_device *dev = find_channel(card, mbox->cmd.lcn);
	x25_channel_t *chan;

	if (!dev)
		return;

	chan=dev->priv;

	if (chan->common.usedby == API)
		send_oob_msg(card,dev,mbox);
	
}




static int channel_disconnect(sdla_t* card, struct net_device *dev)
{

	int err;
	x25_channel_t *chan = dev->priv;

	DBG_PRINTK(KERN_INFO "%s: TIMER: %s, Device down disconnecting\n",
				card->devname,dev->name);

	if (chan->common.svc){
		err = x25_clear_call(card,chan->common.lcn,0,0);
	}else{
		/* If channel is PVC or LAPB HDLC, there is no call
                 * to be cleared, thus drop down to the default
                 * area 
	         */
		err = 1;
	}

	switch (err){
	
		case X25RES_CHANNEL_IN_USE:	
		case X25RES_NOT_READY:
			err = TRY_CMD_AGAIN;
			break;
		case CMD_OK:
			DBG_PRINTK(KERN_INFO "CALL CLEAR OK: Dev %s Chan Lcn %i\n",
						dev->name,chan->common.lcn);

			set_chan_state(dev,WAN_DISCONNECTING);
			atomic_set(&chan->common.command,0);
			err = DELAY_RESULT;
			break;
		default:
			/* If LAPB HDLC protocol, bring the whole link down
                         * once the application terminates 
			 */

			set_chan_state(dev,WAN_DISCONNECTED);

			if (card->u.x.LAPB_hdlc){
				DBG_PRINTK(KERN_INFO "LAPB: Disconnecting Link\n");
				hdlc_link_down (card);
			}
			atomic_set(&chan->common.command,0);
			err = RETURN_RESULT;
			break;
	}

	return err;
}

static void hdlc_link_down (sdla_t *card)
{
	TX25Mbox* mbox = card->mbox;
	int retry = 5;
	int err=0;

	do {
		memset(mbox,0,sizeof(TX25Mbox));
		mbox->cmd.command = X25_HDLC_LINK_DISC;
		mbox->cmd.length = 1;
		mbox->data[0]=0;
		err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;

	} while (err && retry-- && x25_error(card, err, X25_HDLC_LINK_DISC, 0));

	if (err)
		printk(KERN_INFO "%s: Hdlc Link Down Failed %x\n",card->devname,err);

	disconnect (card);
	
}

static int check_bad_command(sdla_t* card, struct net_device *dev)
{
	x25_channel_t *chan = dev->priv;
	int bad_cmd = 0;

	switch (atomic_read(&chan->common.command)&0x7F){

		case X25_PLACE_CALL:
			if (chan->common.state != WAN_DISCONNECTED)
				bad_cmd=1;
			break;
		case X25_CLEAR_CALL:
			if (chan->common.state == WAN_DISCONNECTED)
				bad_cmd=1;
			break;
		case X25_ACCEPT_CALL:
			if (chan->common.state != WAN_CONNECTING)
				bad_cmd=1;
			break;
		case X25_RESET:
			if (chan->common.state != WAN_CONNECTED)
				bad_cmd=1;
			break;
		default:
			bad_cmd=1;
			break;
	}

	if (bad_cmd){
		printk(KERN_INFO "%s: Invalid State, BAD Command %x, dev %s, lcn %i, st %i\n", 
			card->devname,atomic_read(&chan->common.command),dev->name, 
			chan->common.lcn, chan->common.state);
	}

	return bad_cmd;
}



/*************************** XPIPEMON FUNCTIONS **************************/

/*==============================================================================
 * Process UDP call of type XPIPE
 */

static int process_udp_mgmt_pkt(sdla_t *card)
{
	int            c_retry = MAX_CMD_RETRY;
	unsigned int   len;
	struct sk_buff *new_skb;
	TX25Mbox       *mbox = card->mbox;
	int            err;
	int            udp_mgmt_req_valid = 1;
	struct net_device *dev;
        x25_channel_t  *chan;
	unsigned short lcn;
	struct timeval tv;
	

	x25_udp_pkt_t *x25_udp_pkt;
	x25_udp_pkt = (x25_udp_pkt_t *)card->u.x.udp_pkt_data;

	dev = card->u.x.udp_dev;
	chan = dev->priv;
	lcn = chan->common.lcn;

	switch(x25_udp_pkt->cblock.command) {
            
		/* XPIPE_ENABLE_TRACE */
		case XPIPE_ENABLE_TRACING:

		/* XPIPE_GET_TRACE_INFO */
		case XPIPE_GET_TRACE_INFO:
 
		/* SET FT1 MODE */
		case XPIPE_SET_FT1_MODE:
           
			if(card->u.x.udp_pkt_src == UDP_PKT_FRM_NETWORK) {
                    		++chan->pipe_mgmt_stat.UDP_PIPE_mgmt_direction_err;
				udp_mgmt_req_valid = 0;
				break;
			}

		/* XPIPE_FT1_READ_STATUS */
		case XPIPE_FT1_READ_STATUS:

		/* FT1 MONITOR STATUS */
		case XPIPE_FT1_STATUS_CTRL:
			if(card->hw.fwid !=  SFID_X25_508) {
				++chan->pipe_mgmt_stat.UDP_PIPE_mgmt_adptr_type_err;
				udp_mgmt_req_valid = 0;
				break;
			}
		default:
			break;
       	}

	if(!udp_mgmt_req_valid) {
           	/* set length to 0 */
		x25_udp_pkt->cblock.length = 0;
		/* set return code */
		x25_udp_pkt->cblock.result = (card->hw.fwid != SFID_X25_508) ? 0x1F : 0xCD;
		
	} else {   
        
		switch (x25_udp_pkt->cblock.command) {
    
	
		case XPIPE_FLUSH_DRIVER_STATS:
			init_x25_channel_struct(chan);
			init_global_statistics(card);
			mbox->cmd.length = 0;
			break;


		case XPIPE_DRIVER_STAT_IFSEND:
			memcpy(x25_udp_pkt->data, &chan->if_send_stat, sizeof(if_send_stat_t));
			mbox->cmd.length = sizeof(if_send_stat_t);
			x25_udp_pkt->cblock.length =  mbox->cmd.length;	
			break;
	
		case XPIPE_DRIVER_STAT_INTR:
			memcpy(&x25_udp_pkt->data[0], &card->statistics, sizeof(global_stats_t));
                        memcpy(&x25_udp_pkt->data[sizeof(global_stats_t)],
                                &chan->rx_intr_stat, sizeof(rx_intr_stat_t));
			
			mbox->cmd.length = sizeof(global_stats_t) +
					sizeof(rx_intr_stat_t);
			x25_udp_pkt->cblock.length =  mbox->cmd.length;
			break;

		case XPIPE_DRIVER_STAT_GEN:
                        memcpy(x25_udp_pkt->data,
                                &chan->pipe_mgmt_stat.UDP_PIPE_mgmt_kmalloc_err,
                                sizeof(pipe_mgmt_stat_t));

                        memcpy(&x25_udp_pkt->data[sizeof(pipe_mgmt_stat_t)],
                               &card->statistics, sizeof(global_stats_t));

                        x25_udp_pkt->cblock.result = 0;
                        x25_udp_pkt->cblock.length = sizeof(global_stats_t)+
                                                     sizeof(rx_intr_stat_t);
                        mbox->cmd.length = x25_udp_pkt->cblock.length;
                        break;

		case XPIPE_ROUTER_UP_TIME:
			do_gettimeofday(&tv);
			chan->router_up_time = tv.tv_sec - chan->router_start_time;
    	                *(unsigned long *)&x25_udp_pkt->data = chan->router_up_time;	
			x25_udp_pkt->cblock.length = mbox->cmd.length = 4;
			x25_udp_pkt->cblock.result = 0;
			break;
	
		default :

			do {
				memcpy(&mbox->cmd, &x25_udp_pkt->cblock.command, sizeof(TX25Cmd));
				if(mbox->cmd.length){ 
					memcpy(&mbox->data, 
					       (char *)x25_udp_pkt->data, 
					       mbox->cmd.length);
				}	
		
				err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
			} while (err && c_retry-- && x25_error(card, err, mbox->cmd.command, 0));


			if ( err == CMD_OK || 
			    (err == 1 && 
			     (mbox->cmd.command == 0x06 || 
			      mbox->cmd.command == 0x16)  ) ){

				++chan->pipe_mgmt_stat.UDP_PIPE_mgmt_adptr_cmnd_OK;
			} else {
				++chan->pipe_mgmt_stat.UDP_PIPE_mgmt_adptr_cmnd_timeout;
			}

			  /* copy the result back to our buffer */
			memcpy(&x25_udp_pkt->cblock.command, &mbox->cmd, sizeof(TX25Cmd));

      	         	if(mbox->cmd.length) {
        	               memcpy(&x25_udp_pkt->data, &mbox->data, mbox->cmd.length);
			}
			break;

		} //switch

        }
    
        /* Fill UDP TTL */

	x25_udp_pkt->ip_pkt.ttl = card->wandev.ttl;
        len = reply_udp(card->u.x.udp_pkt_data, mbox->cmd.length);


        if(card->u.x.udp_pkt_src == UDP_PKT_FRM_NETWORK) {
		
		err = x25_send(card, lcn, 0, len, card->u.x.udp_pkt_data);
		if (!err) 
			++chan->pipe_mgmt_stat.UDP_PIPE_mgmt_adptr_send_passed;
		else
			++chan->pipe_mgmt_stat.UDP_PIPE_mgmt_adptr_send_failed;
	
	} else {

		/* Allocate socket buffer */
		if((new_skb = dev_alloc_skb(len)) != NULL) {
			void *buf;

			/* copy data into new_skb */
			buf = skb_put(new_skb, len);
			memcpy(buf, card->u.x.udp_pkt_data, len);
        
			/* Decapsulate packet and pass it up the protocol 
			   stack */
			new_skb->dev = dev;
	
			if (chan->common.usedby == API)
                        	new_skb->protocol = htons(X25_PROT);
			else 
				new_skb->protocol = htons(ETH_P_IP);
	
                        new_skb->mac.raw = new_skb->data;

			netif_rx(new_skb);
			++chan->pipe_mgmt_stat.UDP_PIPE_mgmt_passed_to_stack;
            	
		} else {
			++chan->pipe_mgmt_stat.UDP_PIPE_mgmt_no_socket;
			printk(KERN_INFO 
			"%s: UDP mgmt cmnd, no socket buffers available!\n", 
			card->devname);
            	}
        }

	card->u.x.udp_pkt_lgth = 0;

	return 1;
}


/*==============================================================================
 * Determine what type of UDP call it is. DRVSTATS or XPIPE8ND ?
 */
static int udp_pkt_type( struct sk_buff *skb, sdla_t* card )
{
	x25_udp_pkt_t *x25_udp_pkt = (x25_udp_pkt_t *)skb->data;

        if((x25_udp_pkt->ip_pkt.protocol == UDPMGMT_UDP_PROTOCOL) &&
		(x25_udp_pkt->ip_pkt.ver_inet_hdr_length == 0x45) &&
		(x25_udp_pkt->udp_pkt.udp_dst_port == ntohs(card->wandev.udp_port)) &&
		(x25_udp_pkt->wp_mgmt.request_reply == UDPMGMT_REQUEST)) {

                        if(!strncmp(x25_udp_pkt->wp_mgmt.signature,
                                UDPMGMT_XPIPE_SIGNATURE, 8)){
                                return UDP_XPIPE_TYPE;
			}else{
				printk(KERN_INFO "%s: UDP Packet, Failed Signature !\n",
					card->devname);
			}
	}

        return UDP_INVALID_TYPE;
}


/*============================================================================
 * Reply to UDP Management system.
 * Return nothing.
 */
static int reply_udp( unsigned char *data, unsigned int mbox_len ) 
{
	unsigned short len, udp_length, temp, ip_length;
	unsigned long ip_temp;
	int even_bound = 0;

  
	x25_udp_pkt_t *x25_udp_pkt = (x25_udp_pkt_t *)data; 

	/* Set length of packet */
	len = sizeof(ip_pkt_t)+ 
	      sizeof(udp_pkt_t)+
	      sizeof(wp_mgmt_t)+
	      sizeof(cblock_t)+
	      mbox_len;
 

	/* fill in UDP reply */
	x25_udp_pkt->wp_mgmt.request_reply = UDPMGMT_REPLY;
  
	/* fill in UDP length */
	udp_length = sizeof(udp_pkt_t)+ 
		     sizeof(wp_mgmt_t)+
		     sizeof(cblock_t)+
		     mbox_len; 


	/* put it on an even boundary */
	if ( udp_length & 0x0001 ) {
		udp_length += 1;
		len += 1;
		even_bound = 1;
	}

	temp = (udp_length<<8)|(udp_length>>8);
	x25_udp_pkt->udp_pkt.udp_length = temp;
	 
	/* swap UDP ports */
	temp = x25_udp_pkt->udp_pkt.udp_src_port;
	x25_udp_pkt->udp_pkt.udp_src_port = 
			x25_udp_pkt->udp_pkt.udp_dst_port; 
	x25_udp_pkt->udp_pkt.udp_dst_port = temp;



	/* add UDP pseudo header */
	temp = 0x1100;
	*((unsigned short *)
		(x25_udp_pkt->data+mbox_len+even_bound)) = temp;	
	temp = (udp_length<<8)|(udp_length>>8);
	*((unsigned short *)
		(x25_udp_pkt->data+mbox_len+even_bound+2)) = temp;
		 
	/* calculate UDP checksum */
	x25_udp_pkt->udp_pkt.udp_checksum = 0;

	x25_udp_pkt->udp_pkt.udp_checksum = 
		calc_checksum(&data[UDP_OFFSET], udp_length+UDP_OFFSET);

	/* fill in IP length */
	ip_length = len;
	temp = (ip_length<<8)|(ip_length>>8);
	x25_udp_pkt->ip_pkt.total_length = temp;
  
	/* swap IP addresses */
	ip_temp = x25_udp_pkt->ip_pkt.ip_src_address;
	x25_udp_pkt->ip_pkt.ip_src_address = 
				x25_udp_pkt->ip_pkt.ip_dst_address;
	x25_udp_pkt->ip_pkt.ip_dst_address = ip_temp;

		 
	/* fill in IP checksum */
	x25_udp_pkt->ip_pkt.hdr_checksum = 0;
	x25_udp_pkt->ip_pkt.hdr_checksum = calc_checksum(data, sizeof(ip_pkt_t));

	return len;
} /* reply_udp */

unsigned short calc_checksum (char *data, int len)
{
	unsigned short temp; 
	unsigned long sum=0;
	int i;

	for( i = 0; i <len; i+=2 ) {
		memcpy(&temp,&data[i],2);
		sum += (unsigned long)temp;
	}

	while (sum >> 16 ) {
		sum = (sum & 0xffffUL) + (sum >> 16);
	}

	temp = (unsigned short)sum;
	temp = ~temp;

	if( temp == 0 ) 
		temp = 0xffff;

	return temp;	
}

/*=============================================================================
 * Store a UDP management packet for later processing.
 */

static int store_udp_mgmt_pkt(int udp_type, char udp_pkt_src, sdla_t* card,
			      struct net_device *dev, struct sk_buff *skb,
			      int lcn)
{
        int udp_pkt_stored = 0;

        if(!card->u.x.udp_pkt_lgth && (skb->len <= MAX_LGTH_UDP_MGNT_PKT)){
                card->u.x.udp_pkt_lgth = skb->len;
                card->u.x.udp_type = udp_type;
                card->u.x.udp_pkt_src = udp_pkt_src;
                card->u.x.udp_lcn = lcn;
		card->u.x.udp_dev = dev;
                memcpy(card->u.x.udp_pkt_data, skb->data, skb->len);
                card->u.x.timer_int_enabled |= TMR_INT_ENABLED_UDP_PKT;
                udp_pkt_stored = 1;

        }else{
                printk(KERN_INFO "%s: ERROR: UDP packet not stored for LCN %d\n", 
							card->devname,lcn);
	}

        if(udp_pkt_src == UDP_PKT_FRM_STACK){
                dev_kfree_skb_any(skb);
	}else{
                dev_kfree_skb_any(skb);
	}

        return(udp_pkt_stored);
}



/*=============================================================================
 * Initial the ppp_private_area structure.
 */
static void init_x25_channel_struct( x25_channel_t *chan )
{
	memset(&chan->if_send_stat.if_send_entry,0,sizeof(if_send_stat_t));
	memset(&chan->rx_intr_stat.rx_intr_no_socket,0,sizeof(rx_intr_stat_t));
	memset(&chan->pipe_mgmt_stat.UDP_PIPE_mgmt_kmalloc_err,0,sizeof(pipe_mgmt_stat_t));
}

/*============================================================================
 * Initialize Global Statistics
 */
static void init_global_statistics( sdla_t *card )
{
	memset(&card->statistics.isr_entry,0,sizeof(global_stats_t));
}


/*===============================================================
 * SMP Support
 * ==============================================================*/

static void S508_S514_lock(sdla_t *card, unsigned long *smp_flags)
{
	spin_lock_irqsave(&card->wandev.lock, *smp_flags);
}
static void S508_S514_unlock(sdla_t *card, unsigned long *smp_flags)
{
	spin_unlock_irqrestore(&card->wandev.lock, *smp_flags);
}

/*===============================================================
 * x25_timer_routine
 *
 * 	A more efficient polling routine.  Each half a second
 * 	queue a polling task. We want to do the polling in a 
 * 	task not timer, because timer runs in interrupt time.
 *
 * 	FIXME Polling should be rethinked.
 *==============================================================*/

static void x25_timer_routine(unsigned long data)
{
	sdla_t *card = (sdla_t*)data;

	if (!card->wandev.dev){
		printk(KERN_INFO "%s: Stopping the X25 Poll Timer: No Dev.\n",
				card->devname);
		return;
	}

	if (card->open_cnt != card->u.x.num_of_ch){
		printk(KERN_INFO "%s: Stopping the X25 Poll Timer: Interface down.\n",
				card->devname);
		return;
	}

	if (test_bit(PERI_CRIT,&card->wandev.critical)){
		printk(KERN_INFO "%s: Stopping the X25 Poll Timer: Shutting down.\n",
				card->devname);
		return;
	}
	
	if (!test_and_set_bit(POLL_CRIT,&card->wandev.critical)){
		trigger_x25_poll(card);
	}
	
	card->u.x.x25_timer.expires=jiffies+(HZ>>1);
	add_timer(&card->u.x.x25_timer);
	return;
}

void disable_comm_shutdown(sdla_t *card)
{
	TX25Mbox* mbox = card->mbox;
	int err;

	/* Turn of interrutps */
	mbox->data[0] = 0;
	if (card->hw.fwid == SFID_X25_508){
		mbox->data[1] = card->hw.irq;
		mbox->data[2] = 2;
		mbox->cmd.length = 3;
	}else {
	 	mbox->cmd.length  = 1;
	}
	mbox->cmd.command = X25_SET_INTERRUPT_MODE;
	err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	if (err)
		printk(KERN_INFO "INTERRUPT OFF FAIED %x\n",err);

	/* Bring down HDLC */
	mbox->cmd.command = X25_HDLC_LINK_CLOSE;
	mbox->cmd.length  = 0;
	err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	if (err)
		printk(KERN_INFO "LINK CLOSED FAILED %x\n",err);


	/* Brind down DTR */
	mbox->data[0] = 0;
	mbox->data[2] = 0;
	mbox->data[1] = 0x01;
	mbox->cmd.length  = 3;
	mbox->cmd.command = X25_SET_GLOBAL_VARS;
	err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
	if (err)
		printk(KERN_INFO "DTR DOWN FAILED %x\n",err);

}

MODULE_LICENSE("GPL");

/****** End *****************************************************************/