aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/net/wan/sdla_ppp.c
blob: 1761cb68ab48eb89d98ee148344a70e4dd9419e1 (plain) (tree)
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




































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                                                                               
/*****************************************************************************
* sdla_ppp.c	WANPIPE(tm) Multiprotocol WAN Link Driver. PPP 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.
* ============================================================================
* Feb 28, 2001  Nenad Corbic	o Updated if_tx_timeout() routine for 
* 				  2.4.X kernels.
* Nov 29, 2000  Nenad Corbic	o Added the 2.4.x kernel support:
* 				  get_ip_address() function has moved
* 				  into the ppp_poll() routine. It cannot
* 				  be called from an interrupt.
* Nov 07, 2000  Nenad Corbic	o Added security features for UDP debugging:
*                                 Deny all and specify allowed requests.
* May 02, 2000  Nenad Corbic	o Added the dynamic interface shutdown
*                                 option. When the link goes down, the
*                                 network interface IFF_UP flag is reset.
* Mar 06, 2000  Nenad Corbic	o Bug Fix: corrupted mbox recovery.
* Feb 25, 2000  Nenad Corbic    o Fixed the FT1 UDP debugger problem.
* Feb 09, 2000  Nenad Coribc    o Shutdown bug fix. update() was called
*                                 with NULL dev pointer: no check.
* Jan 24, 2000  Nenad Corbic    o Disabled use of CMD complete inter.
* Dev 15, 1999  Nenad Corbic    o Fixed up header files for 2.0.X kernels
* Oct 25, 1999  Nenad Corbic    o Support for 2.0.X kernels
*                                 Moved dynamic route processing into 
*                                 a polling routine.
* Oct 07, 1999  Nenad Corbic    o Support for S514 PCI card.  
*               Gideon Hack     o UPD and Updates executed using timer interrupt
* Sep 10, 1999  Nenad Corbic    o Fixed up the /proc statistics
* Jul 20, 1999  Nenad Corbic    o Remove the polling routines and use 
*                                 interrupts instead.
* Sep 17, 1998	Jaspreet Singh	o Updates for 2.2.X Kernels.
* Aug 13, 1998	Jaspreet Singh	o Improved Line Tracing.
* Jun 22, 1998	David Fong	o Added remote IP address assignment
* Mar 15, 1998	Alan Cox	o 2.1.8x basic port.
* Apr 16, 1998	Jaspreet Singh	o using htons() for the IPX protocol.
* Dec 09, 1997	Jaspreet Singh	o Added PAP and CHAP.
*				o Implemented new routines like 
*				  ppp_set_inbnd_auth(), ppp_set_outbnd_auth(),
*				  tokenize() and strstrip().
* Nov 27, 1997	Jaspreet Singh	o Added protection against enabling of irqs 
*				  while they have been disabled.
* Nov 24, 1997  Jaspreet Singh  o Fixed another RACE condition caused by
*                                 disabling and enabling of irqs.
*                               o Added new counters for stats on disable/enable
*                                 IRQs.
* Nov 10, 1997	Jaspreet Singh	o Initialized 'skb->mac.raw' to 'skb->data'
*				  before every netif_rx().
*				o Free up the device structure in del_if().
* Nov 07, 1997	Jaspreet Singh	o Changed the delay to zero for Line tracing
*				  command.
* Oct 20, 1997 	Jaspreet Singh	o Added hooks in for Router UP time.
* Oct 16, 1997	Jaspreet Singh  o The critical flag is used to maintain flow
*				  control by avoiding RACE conditions.  The 
*				  cli() and restore_flags() are taken out.
*				  A new structure, "ppp_private_area", is added 
*				  to provide Driver Statistics.   
* Jul 21, 1997 	Jaspreet Singh	o Protected calls to sdla_peek() by adding 
*				  save_flags(), cli() and restore_flags().
* Jul 07, 1997	Jaspreet Singh  o Added configurable TTL for UDP packets
*				o Added ability to discard mulitcast and
*				  broacast source addressed packets.
* Jun 27, 1997 	Jaspreet Singh	o Added FT1 monitor capabilities
*				  New case (0x25) statement in if_send routine.
*				  Added a global variable rCount to keep track
*				  of FT1 status enabled on the board.
* May 22, 1997	Jaspreet Singh	o Added change in the PPP_SET_CONFIG command for
*				508 card to reflect changes in the new 
*				ppp508.sfm for supporting:continous transmission
*				of Configure-Request packets without receiving a
*				reply 				
*				OR-ed 0x300 to conf_flags 
*			        o Changed connect_tmout from 900 to 0
* May 21, 1997	Jaspreet Singh  o Fixed UDP Management for multiple boards
* Apr 25, 1997  Farhan Thawar    o added UDP Management stuff
* Mar 11, 1997  Farhan Thawar   Version 3.1.1
*                                o fixed (+1) bug in rx_intr()
*                                o changed if_send() to return 0 if
*                                  wandev.critical() is true
*                                o free socket buffer in if_send() if
*                                  returning 0 
* Jan 15, 1997	Gene Kozin	Version 3.1.0
*				 o implemented exec() entry point
* Jan 06, 1997	Gene Kozin	Initial version.
*****************************************************************************/

#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/slab.h>	/* kmalloc(), kfree() */
#include <linux/wanrouter.h>	/* WAN router definitions */
#include <linux/wanpipe.h>	/* WANPIPE common user API definitions */
#include <linux/if_arp.h>	/* ARPHRD_* defines */
#include <asm/byteorder.h>	/* htons(), etc. */
#include <linux/in.h>		/* sockaddr_in */


#include <asm/uaccess.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>

#include <linux/if.h>
#include <linux/sdla_ppp.h>		/* PPP firmware API definitions */
#include <linux/sdlasfm.h>		/* S514 Type Definition */
/****** Defines & Macros ****************************************************/

#define	PPP_DFLT_MTU	1500		/* default MTU */
#define	PPP_MAX_MTU	4000		/* maximum MTU */
#define PPP_HDR_LEN	1

#define MAX_IP_ERRORS 100 

#define	CONNECT_TIMEOUT	(90*HZ)		/* link connection timeout */
#define	HOLD_DOWN_TIME	(5*HZ)		/* link hold down time : Changed from 30 to 5 */

/* For handle_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)))

/* Macro for enabling/disabling debugging comments */
//#define NEX_DEBUG
#ifdef NEX_DEBUG
#define NEX_PRINTK(format, a...) printk(format, ## a)
#else
#define NEX_PRINTK(format, a...)
#endif /* NEX_DEBUG */ 

#define DCD(a)   ( a & 0x08 ? "HIGH" : "LOW" )
#define CTS(a)   ( a & 0x20 ? "HIGH" : "LOW" )
#define LCP(a)   ( a == 0x09 ? "OPEN" : "CLOSED" )
#define IP(a)    ( a == 0x09 ? "ENABLED" : "DISABLED" )

#define TMR_INT_ENABLED_UPDATE  	0x01
#define TMR_INT_ENABLED_PPP_EVENT	0x02
#define TMR_INT_ENABLED_UDP		0x04
#define TMR_INT_ENABLED_CONFIG		0x20

/* Set Configuraton Command Definitions */
#define PERCENT_TX_BUFF			60
#define TIME_BETWEEN_CONF_REQ  		30
#define TIME_BETWEEN_PAP_CHAP_REQ	30
#define WAIT_PAP_CHAP_WITHOUT_REPLY     300
#define WAIT_AFTER_DCD_CTS_LOW          5
#define TIME_DCD_CTS_LOW_AFTER_LNK_DOWN 10
#define WAIT_DCD_HIGH_AFTER_ENABLE_COMM 900
#define MAX_CONF_REQ_WITHOUT_REPLY      10
#define MAX_TERM_REQ_WITHOUT_REPLY      2
#define NUM_CONF_NAK_WITHOUT_REPLY      5
#define NUM_AUTH_REQ_WITHOUT_REPLY      10

#define END_OFFSET 0x1F0


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

/* This structure is placed in the private data area of the device structure.
 * The card structure used to occupy the private area but now the following 
 * structure will incorporate the card structure along with PPP specific data
 */
  
typedef struct ppp_private_area
{
	struct net_device *slave;
	sdla_t* card;	
	unsigned long router_start_time;	/*router start time in sec */
	unsigned long tick_counter;		/*used for 5 second counter*/
	unsigned mc;				/*multicast support on or off*/
	unsigned char enable_IPX;
	unsigned long network_number;
	unsigned char pap;
	unsigned char chap;
	unsigned char sysname[31];		/* system name for in-bnd auth*/
	unsigned char userid[511];		/* list of user ids */
	unsigned char passwd[511];		/* list of passwords */
	unsigned protocol;			/* SKB Protocol */
	u32 ip_local;				/* Local IP Address */
	u32 ip_remote;				/* remote IP Address */

	u32 ip_local_tmp;
	u32 ip_remote_tmp;
	
	unsigned char timer_int_enabled;	/* Who enabled the timer inter*/
	unsigned char update_comms_stats;	/* Used by update function */
	unsigned long curr_trace_addr;		/* Trace information */
	unsigned long start_trace_addr;
	unsigned long end_trace_addr;

	unsigned char interface_down;		/* Brind down interface when channel 
                                                   goes down */
	unsigned long config_wait_timeout;	/* After if_open() if in dynamic if mode,
						   wait a few seconds before configuring */
	
	unsigned short udp_pkt_lgth;
	char  udp_pkt_src;
      	char  udp_pkt_data[MAX_LGTH_UDP_MGNT_PKT];

	/* PPP specific statistics */

	if_send_stat_t if_send_stat;
	rx_intr_stat_t rx_intr_stat;
	pipe_mgmt_stat_t pipe_mgmt_stat;

	unsigned long router_up_time; 

	/* Polling work queue entry. Each interface
         * has its own work queue entry, which is used
         * to defer events from the interrupt */
	struct work_struct poll_work;
	struct timer_list poll_delay_timer;

	u8 gateway;
	u8 config_ppp;
	u8 ip_error;
	
}ppp_private_area_t;

/* variable for keeping track of enabling/disabling FT1 monitor status */
static int rCount = 0;

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

/****** 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);

/* WANPIPE-specific entry points */
static int wpp_exec (struct sdla *card, void *u_cmd, void *u_data);

/* 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 void if_tx_timeout(struct net_device *dev);

static int if_rebuild_hdr(struct sk_buff *skb);
static struct net_device_stats *if_stats(struct net_device *dev);
static int if_send(struct sk_buff *skb, struct net_device *dev);


/* PPP firmware interface functions */
static int ppp_read_version(sdla_t *card, char *str);
static int ppp_set_outbnd_auth(sdla_t *card, ppp_private_area_t *ppp_priv_area);
static int ppp_set_inbnd_auth(sdla_t *card, ppp_private_area_t *ppp_priv_area);
static int ppp_configure(sdla_t *card, void *data);
static int ppp_set_intr_mode(sdla_t *card, unsigned char mode);
static int ppp_comm_enable(sdla_t *card);
static int ppp_comm_disable(sdla_t *card);
static int ppp_comm_disable_shutdown(sdla_t *card);
static int ppp_get_err_stats(sdla_t *card);
static int ppp_send(sdla_t *card, void *data, unsigned len, unsigned proto);
static int ppp_error(sdla_t *card, int err, ppp_mbox_t *mb);

static void wpp_isr(sdla_t *card);
static void rx_intr(sdla_t *card);
static void event_intr(sdla_t *card);
static void timer_intr(sdla_t *card);

/* Background polling routines */
static void process_route(sdla_t *card);
static void retrigger_comm(sdla_t *card);

/* Miscellaneous functions */
static int read_info( sdla_t *card );
static int read_connection_info (sdla_t *card);
static void remove_route( sdla_t *card );
static int config508(struct net_device *dev, sdla_t *card);
static void show_disc_cause(sdla_t * card, unsigned cause);
static int reply_udp( unsigned char *data, unsigned int mbox_len );
static void process_udp_mgmt_pkt(sdla_t *card, struct net_device *dev, 
				ppp_private_area_t *ppp_priv_area);
static void init_ppp_tx_rx_buff( sdla_t *card );
static int intr_test( sdla_t *card );
static int udp_pkt_type( struct sk_buff *skb , sdla_t *card);
static void init_ppp_priv_struct( ppp_private_area_t *ppp_priv_area);
static void init_global_statistics( sdla_t *card );
static int tokenize(char *str, char **tokens);
static char* strstrip(char *str, char *s);
static int chk_bcast_mcast_addr(sdla_t* card, struct net_device* dev,
				struct sk_buff *skb);

static int config_ppp (sdla_t *);
static void ppp_poll(struct net_device *dev);
static void trigger_ppp_poll(struct net_device *dev);
static void ppp_poll_delay (unsigned long dev_ptr);


static int Read_connection_info;
static int Intr_test_counter;
static unsigned short available_buffer_space;


/* IPX functions */
static void switch_net_numbers(unsigned char *sendpacket, unsigned long network_number, 
			       unsigned char incoming);
static int handle_IPXWAN(unsigned char *sendpacket, char *devname, unsigned char enable_PX, 
			 unsigned long network_number, unsigned short proto);

/* Lock Functions */
static void s508_lock (sdla_t *card, unsigned long *smp_flags);
static void s508_unlock (sdla_t *card, unsigned long *smp_flags);

static int store_udp_mgmt_pkt(char udp_pkt_src, sdla_t* card,
                                struct sk_buff *skb, struct net_device* dev,
                                ppp_private_area_t* ppp_priv_area );
static unsigned short calc_checksum (char *data, int len);
static void disable_comm (sdla_t *card);
static int detect_and_fix_tx_bug (sdla_t *card);

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

/*============================================================================
 * PPP protocol initialization routine.
 *
 * This routine is called by the main WANPIPE module during setup.  At this
 * point adapter is completely initialized and 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.
 *
 * Return:	0	o.k.
 *		< 0	failure.
 */
int wpp_init(sdla_t *card, wandev_conf_t *conf)
{
	ppp_flags_t *flags;
	union
	{
		char str[80];
	} u;

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

	}

	/* Initialize miscellaneous pointers to structures on the adapter */
	switch (card->hw.type) {

		case SDLA_S508:
			card->mbox =(void*)(card->hw.dpmbase + PPP508_MB_OFFS);
			card->flags=(void*)(card->hw.dpmbase + PPP508_FLG_OFFS);
			break;
		
		case SDLA_S514:
			card->mbox =(void*)(card->hw.dpmbase + PPP514_MB_OFFS);
			card->flags=(void*)(card->hw.dpmbase + PPP514_FLG_OFFS);
			break;

		default:
			return -EINVAL;

	}
	flags = card->flags;

	/* 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 (ppp_read_version(card, NULL) || ppp_read_version(card, u.str))
		return -EIO;
	
	printk(KERN_INFO "%s: running PPP firmware v%s\n",card->devname, u.str); 
	/* Adjust configuration and set defaults */
	card->wandev.mtu = (conf->mtu) ?
		min_t(unsigned int, conf->mtu, PPP_MAX_MTU) : PPP_DFLT_MTU;

	card->wandev.bps	= conf->bps;
	card->wandev.interface	= conf->interface;
	card->wandev.clocking	= conf->clocking;
	card->wandev.station	= conf->station;
	card->isr		= &wpp_isr;
	card->poll		= NULL; 
	card->exec		= &wpp_exec;
	card->wandev.update	= &update;
	card->wandev.new_if	= &new_if;
	card->wandev.del_if	= &del_if;
        card->wandev.udp_port   = conf->udp_port;
	card->wandev.ttl	= conf->ttl;
	card->wandev.state      = WAN_DISCONNECTED;
	card->disable_comm	= &disable_comm;
	card->irq_dis_if_send_count = 0;
        card->irq_dis_poll_count = 0;
	card->u.p.authenticator = conf->u.ppp.authenticator;
	card->u.p.ip_mode 	= conf->u.ppp.ip_mode ?
				 conf->u.ppp.ip_mode : WANOPT_PPP_STATIC;
        card->TracingEnabled    = 0;
	Read_connection_info    = 1;

	/* initialize global statistics */
	init_global_statistics( card );



	if (!card->configured){
		int err;

		Intr_test_counter = 0;
		err = intr_test(card);

		if(err || (Intr_test_counter < MAX_INTR_TEST_COUNTER)) {
			printk("%s: Interrupt Test Failed, Counter: %i\n", 
				card->devname, Intr_test_counter);
			printk( "%s: Please choose another interrupt\n",card->devname);
			return -EIO;
		}
		
		printk(KERN_INFO "%s: Interrupt Test Passed, Counter: %i\n", 
			card->devname, Intr_test_counter);
		card->configured = 1;
	}

	ppp_set_intr_mode(card, PPP_INTR_TIMER); 

	/* Turn off the transmit and timer interrupt */
	flags->imask &= ~PPP_INTR_TIMER;

	printk(KERN_INFO "\n");

	return 0;
}

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

/*============================================================================
 * Update device status & statistics.
 */
static int update(struct wan_device *wandev)
{
	sdla_t* card = wandev->private;
 	struct net_device* dev;
        volatile ppp_private_area_t *ppp_priv_area;
	ppp_flags_t *flags = card->flags;
	unsigned long timeout;

	/* sanity checks */
	if ((wandev == NULL) || (wandev->private == NULL))
		return -EFAULT;
	
	if (wandev->state == WAN_UNCONFIGURED)
		return -ENODEV;
	
	/* Shutdown bug fix. This function can be
         * called with NULL dev pointer during
         * shutdown 
	 */
	if ((dev=card->wandev.dev) == NULL){
		return -ENODEV;
	}

	if ((ppp_priv_area=dev->priv) == NULL){
		return -ENODEV;
	}
	
	ppp_priv_area->update_comms_stats = 2;
	ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_UPDATE;
	flags->imask |= PPP_INTR_TIMER;	
	
	/* wait a maximum of 1 second for the statistics to be updated */ 
        timeout = jiffies;
        for(;;) {
		if(ppp_priv_area->update_comms_stats == 0){
			break;
		}
                if ((jiffies - timeout) > (1 * HZ)){
    			ppp_priv_area->update_comms_stats = 0;
 			ppp_priv_area->timer_int_enabled &=
				~TMR_INT_ENABLED_UPDATE; 
 			return -EAGAIN;
		}
        }

	return 0;
}

/*============================================================================
 * Create new logical channel.
 * This routine is called by the router when ROUTER_IFNEW IOCTL is being
 * handled.
 * o parse media- and hardware-specific configuration
 * o make sure that a new channel can be created
 * o allocate resources, if necessary
 * o prepare network device structure for registaration.
 *
 * Return:	0	o.k.
 *		< 0	failure (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;
	ppp_private_area_t *ppp_priv_area;

	if (wandev->ndev)
		return -EEXIST;
	

	printk(KERN_INFO "%s: Configuring Interface: %s\n",
			card->devname, conf->name);

	if ((conf->name[0] == '\0') || (strlen(conf->name) > WAN_IFNAME_SZ)) {

		printk(KERN_INFO "%s: Invalid interface name!\n",
			card->devname);
		return -EINVAL;

	}

	/* allocate and initialize private data */
	ppp_priv_area = kmalloc(sizeof(ppp_private_area_t), GFP_KERNEL);
	
	if( ppp_priv_area == NULL )
		return	-ENOMEM;
	
	memset(ppp_priv_area, 0, sizeof(ppp_private_area_t));
	
	ppp_priv_area->card = card; 
	
	/* initialize data */
	strcpy(card->u.p.if_name, conf->name);

	/* initialize data in ppp_private_area structure */
	
	init_ppp_priv_struct( ppp_priv_area );

	ppp_priv_area->mc = conf->mc;
	ppp_priv_area->pap = conf->pap;
	ppp_priv_area->chap = conf->chap;

	/* Option to bring down the interface when 
         * the link goes down */
	if (conf->if_down){
		set_bit(DYN_OPT_ON,&ppp_priv_area->interface_down);
		printk("%s: Dynamic interface configuration enabled\n",
			card->devname);
	} 

	/* If no user ids are specified */
	if(!strlen(conf->userid) && (ppp_priv_area->pap||ppp_priv_area->chap)){
		kfree(ppp_priv_area);
		return -EINVAL;
	}

	/* If no passwords are specified */
	if(!strlen(conf->passwd) && (ppp_priv_area->pap||ppp_priv_area->chap)){
		kfree(ppp_priv_area);
		return -EINVAL;
	}

	if(strlen(conf->sysname) > 31){
		kfree(ppp_priv_area);
		return -EINVAL;
	}

	/* If no system name is specified */
	if(!strlen(conf->sysname) && (card->u.p.authenticator)){
		kfree(ppp_priv_area);
		return -EINVAL;
	}

	/* copy the data into the ppp private structure */
	memcpy(ppp_priv_area->userid, conf->userid, strlen(conf->userid));
	memcpy(ppp_priv_area->passwd, conf->passwd, strlen(conf->passwd));
	memcpy(ppp_priv_area->sysname, conf->sysname, strlen(conf->sysname));

	
	ppp_priv_area->enable_IPX = conf->enable_IPX;
	if (conf->network_number){
		ppp_priv_area->network_number = conf->network_number;
	}else{
		ppp_priv_area->network_number = 0xDEADBEEF;
	}

	/* Tells us that if this interface is a
         * gateway or not */
	if ((ppp_priv_area->gateway = conf->gateway) == WANOPT_YES){
		printk(KERN_INFO "%s: Interface %s is set as a gateway.\n",
			card->devname,card->u.p.if_name);
	}

	/* prepare network device data space for registration */
 	strcpy(dev->name,card->u.p.if_name);
	
	dev->init = &if_init;
	dev->priv = ppp_priv_area;
	dev->mtu = min_t(unsigned int, dev->mtu, card->wandev.mtu);

	/* Initialize the polling work routine */
	INIT_WORK(&ppp_priv_area->poll_work, (void*)(void*)ppp_poll, dev);

	/* Initialize the polling delay timer */
	init_timer(&ppp_priv_area->poll_delay_timer);
	ppp_priv_area->poll_delay_timer.data = (unsigned long)dev;
	ppp_priv_area->poll_delay_timer.function = ppp_poll_delay;
	
	
	/* Since we start with dummy IP addresses we can say
	 * that route exists */
	printk(KERN_INFO "\n");

	return 0;
}

/*============================================================================
 * Delete logical channel.
 */
static int del_if(struct wan_device *wandev, struct net_device *dev)
{
	return 0;
}

static void disable_comm (sdla_t *card)
{
	ppp_comm_disable_shutdown(card);
	return;
}

/****** WANPIPE-specific entry points ***************************************/

/*============================================================================
 * Execute adapter interface command.
 */

//FIXME: Why do we need this ????
static int wpp_exec(struct sdla *card, void *u_cmd, void *u_data)
{
	ppp_mbox_t *mbox = card->mbox;
	int len;

	if (copy_from_user((void*)&mbox->cmd, u_cmd, sizeof(ppp_cmd_t)))
		return -EFAULT;

	len = mbox->cmd.length;

	if (len) {

		if( copy_from_user((void*)&mbox->data, u_data, len))
			return -EFAULT;

	}

	/* execute command */
	if (!sdla_exec(mbox))
		return -EIO;

	/* return result */
	if( copy_to_user(u_cmd, (void*)&mbox->cmd, sizeof(ppp_cmd_t)))
		return -EFAULT;
	len = mbox->cmd.length;

	if (len && u_data && copy_to_user(u_data, (void*)&mbox->data, len))
		return -EFAULT;

	return 0;
}

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

/*============================================================================
 * Initialize Linux network interface.
 *
 * This routine is called only once for each interface, during Linux network
 * interface registration.  Returning anything but zero will fail interface
 * registration.
 */
static int if_init(struct net_device *dev)
{
	ppp_private_area_t *ppp_priv_area = dev->priv;
	sdla_t *card = ppp_priv_area->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;

	/* Enable Mulitcasting if specified by user*/
	if (ppp_priv_area->mc == WANOPT_YES){
		dev->flags	|= IFF_MULTICAST;
	}

	dev->mtu		= wandev->mtu;
	dev->hard_header_len	= PPP_HDR_LEN;	/* media header length */

	/* Initialize hardware parameters (just for reference) */
	dev->irq		= wandev->irq;
	dev->dma		= wandev->dma;
	dev->base_addr		= wandev->ioport;
	dev->mem_start		= wandev->maddr;
	dev->mem_end		= wandev->maddr + wandev->msize - 1;

        /* Set transmit buffer queue length */
        dev->tx_queue_len = 100;
	SET_MODULE_OWNER(dev);
   
	return 0;
}

/*============================================================================
 * Open network interface.
 * o enable communications and interrupts.
 * o prevent module from unloading by incrementing use count
 *
 * Return 0 if O.k. or errno.
 */
static int if_open(struct net_device *dev)
{
	ppp_private_area_t *ppp_priv_area = dev->priv;
	sdla_t *card = ppp_priv_area->card;
	struct timeval tv;
	//unsigned long smp_flags;

	if (netif_running(dev))
		return -EBUSY;

	wanpipe_open(card);

	netif_start_queue(dev);
	
	do_gettimeofday( &tv );
	ppp_priv_area->router_start_time = tv.tv_sec;

	/* We cannot configure the card here because we don't
	 * have access to the interface IP addresses.
         * Once the interface initilization is complete, we will be
         * able to access the IP addresses.  Therefore,
         * configure the ppp link in the poll routine */
	set_bit(0,&ppp_priv_area->config_ppp);
	ppp_priv_area->config_wait_timeout=jiffies;

	/* Start the PPP configuration after 1sec delay.
	 * This will give the interface initilization time
	 * to finish its configuration */
	mod_timer(&ppp_priv_area->poll_delay_timer, jiffies + HZ);
	return 0;
}

/*============================================================================
 * Close network interface.
 * o if this is the last open, then disable communications and interrupts.
 * o reset flags.
 */
static int if_close(struct net_device *dev)
{
	ppp_private_area_t *ppp_priv_area = dev->priv;
	sdla_t *card = ppp_priv_area->card;

	netif_stop_queue(dev);
	wanpipe_close(card);

	del_timer (&ppp_priv_area->poll_delay_timer);
	return 0;
}

/*============================================================================
 * Build media header.
 *
 * The trick here is to put packet type (Ethertype) into 'protocol' field of
 * the socket buffer, so that we don't forget it.  If packet type is not
 * supported, 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)
{
	switch (type)
	{
		case ETH_P_IP:
		case ETH_P_IPX:
			skb->protocol = htons(type);
			break;

		default:
			skb->protocol = 0;
	}

	return PPP_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;
	ppp_private_area_t *ppp_priv_area = dev->priv;
	sdla_t *card = ppp_priv_area->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)
{
    	ppp_private_area_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;
	++card->wandev.stats.collisions;

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



/*============================================================================
 * Send a packet on a network interface.
 * o set tbusy flag (marks start of the transmission) to block a timer-based
 *   transmit from overlapping.
 * o check link state. If link is not up, then drop the packet.
 * o execute adapter send command.
 * 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)
{
	ppp_private_area_t *ppp_priv_area = dev->priv;
	sdla_t *card = ppp_priv_area->card;
	unsigned char *sendpacket;
	unsigned long smp_flags;
	ppp_flags_t *flags = card->flags;
	int udp_type;
	int err=0;
	
	++ppp_priv_area->if_send_stat.if_send_entry;

	netif_stop_queue(dev);
	
	if (skb == NULL) {

		/* If we get here, some higher layer thinks we've missed an
		 * tx-done interrupt.
		 */
		printk(KERN_INFO "%s: interface %s got kicked!\n",
			card->devname, dev->name);
		
		++ppp_priv_area->if_send_stat.if_send_skb_null;
	
		netif_wake_queue(dev);
		return 0;
	}

	sendpacket = skb->data;

	udp_type = udp_pkt_type( skb, card );


	if (udp_type == UDP_PTPIPE_TYPE){
		if(store_udp_mgmt_pkt(UDP_PKT_FRM_STACK, card, skb, dev,
                	              ppp_priv_area)){
	               	flags->imask |= PPP_INTR_TIMER;
		}
		++ppp_priv_area->if_send_stat.if_send_PIPE_request;
		netif_start_queue(dev);
		return 0;
	}

	/* Check for broadcast and multicast addresses 
	 * If found, drop (deallocate) a packet and return.
	 */
	if(chk_bcast_mcast_addr(card, dev, skb)){
		++card->wandev.stats.tx_dropped;
		dev_kfree_skb_any(skb);
		netif_start_queue(dev);
		return 0;
	}


 	if(card->hw.type != SDLA_S514){
		s508_lock(card,&smp_flags);
	}

    	if (test_and_set_bit(SEND_CRIT, (void*)&card->wandev.critical)) {

		printk(KERN_INFO "%s: Critical in if_send: %lx\n",
				card->wandev.name,card->wandev.critical);
		
		++card->wandev.stats.tx_dropped;
		++ppp_priv_area->if_send_stat.if_send_critical_non_ISR;
		netif_start_queue(dev);
		goto if_send_exit_crit;
	}

	if (card->wandev.state != WAN_CONNECTED) {

		++ppp_priv_area->if_send_stat.if_send_wan_disconnected;
        	++card->wandev.stats.tx_dropped;
		netif_start_queue(dev);
		
     	} else if (!skb->protocol) {
		++ppp_priv_area->if_send_stat.if_send_protocol_error;
        	++card->wandev.stats.tx_errors;
		netif_start_queue(dev);
		
	} else {

		/*If it's IPX change the network numbers to 0 if they're ours.*/
		if( skb->protocol == htons(ETH_P_IPX) ) {
			if(ppp_priv_area->enable_IPX) {
				switch_net_numbers( skb->data, 
					ppp_priv_area->network_number, 0);
			} else {
				++card->wandev.stats.tx_dropped;
				netif_start_queue(dev);
				goto if_send_exit_crit;
			}
		}

		if (ppp_send(card, skb->data, skb->len, skb->protocol)) {
			netif_stop_queue(dev);
			++ppp_priv_area->if_send_stat.if_send_adptr_bfrs_full;
			++ppp_priv_area->if_send_stat.if_send_tx_int_enabled;
		} else {
			++ppp_priv_area->if_send_stat.if_send_bfr_passed_to_adptr;
			++card->wandev.stats.tx_packets;
			card->wandev.stats.tx_bytes += skb->len;
			netif_start_queue(dev);
			dev->trans_start = jiffies;
		}
    	}
	
if_send_exit_crit:
	
	if (!(err=netif_queue_stopped(dev))){
      		dev_kfree_skb_any(skb);
	}else{
		ppp_priv_area->tick_counter = jiffies;
		flags->imask |= PPP_INTR_TXRDY;	/* unmask Tx interrupts */
	}
	
	clear_bit(SEND_CRIT,&card->wandev.critical);
	if(card->hw.type != SDLA_S514){	
		s508_unlock(card,&smp_flags);
	}

	return err;
}


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

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

	if(!ppp_priv_area->udp_pkt_lgth && (skb->len<=MAX_LGTH_UDP_MGNT_PKT)){
        	ppp_priv_area->udp_pkt_lgth = skb->len;
		ppp_priv_area->udp_pkt_src = udp_pkt_src;
       		memcpy(ppp_priv_area->udp_pkt_data, skb->data, skb->len);
		ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_UDP;
		ppp_priv_area->protocol = skb->protocol;
		udp_pkt_stored = 1;
	}else{
		if (skb->len > MAX_LGTH_UDP_MGNT_PKT){
			printk(KERN_INFO "%s: PIPEMON UDP request too long : %i\n",
				card->devname, skb->len);
		}else{
			printk(KERN_INFO "%s: PIPEMON UPD request already pending\n",
				card->devname);
		}
		ppp_priv_area->udp_pkt_lgth = 0;
	}

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

	return(udp_pkt_stored);
}



/*============================================================================
 * Reply to UDP Management system.
 * Return length of reply.
 */
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;
	ppp_udp_pkt_t *p_udp_pkt = (ppp_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 */
  	p_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);
	p_udp_pkt->udp_pkt.udp_length = temp;		

 
	/* swap UDP ports */
	temp = p_udp_pkt->udp_pkt.udp_src_port;
	p_udp_pkt->udp_pkt.udp_src_port = 
			p_udp_pkt->udp_pkt.udp_dst_port; 
	p_udp_pkt->udp_pkt.udp_dst_port = temp;


	/* add UDP pseudo header */
	temp = 0x1100;
	*((unsigned short *)(p_udp_pkt->data+mbox_len+even_bound)) = temp;
	temp = (udp_length<<8)|(udp_length>>8);
	*((unsigned short *)(p_udp_pkt->data+mbox_len+even_bound+2)) = temp;
 
	/* calculate UDP checksum */
	p_udp_pkt->udp_pkt.udp_checksum = 0;
	p_udp_pkt->udp_pkt.udp_checksum = 
		calc_checksum(&data[UDP_OFFSET],udp_length+UDP_OFFSET);

	/* fill in IP length */
	ip_length = udp_length + sizeof(ip_pkt_t);
	temp = (ip_length<<8)|(ip_length>>8);
  	p_udp_pkt->ip_pkt.total_length = temp;
 
	/* swap IP addresses */
	ip_temp = p_udp_pkt->ip_pkt.ip_src_address;
	p_udp_pkt->ip_pkt.ip_src_address = p_udp_pkt->ip_pkt.ip_dst_address;
	p_udp_pkt->ip_pkt.ip_dst_address = ip_temp;

	/* fill in IP checksum */
	p_udp_pkt->ip_pkt.hdr_checksum = 0;
	p_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;	
}

/*
   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 */

/*============================================================================
 * Get ethernet-style interface statistics.
 * Return a pointer to struct net_device_stats.
 */
static struct net_device_stats *if_stats(struct net_device *dev)
{

	ppp_private_area_t *ppp_priv_area = dev->priv;
	sdla_t* card;
	
	if( ppp_priv_area == NULL )
		return NULL;

	card = ppp_priv_area->card;
	return &card->wandev.stats;
}

/****** PPP Firmware Interface Functions ************************************/

/*============================================================================
 * Read firmware code version.
 *	Put code version as ASCII string in str. 
 */
static int ppp_read_version(sdla_t *card, char *str)
{
	ppp_mbox_t *mb = card->mbox;
	int err;

	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	mb->cmd.command = PPP_READ_CODE_VERSION;
	err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;

	if (err != CMD_OK)
 
		ppp_error(card, err, mb);

	else if (str) {

		int len = mb->cmd.length;

		memcpy(str, mb->data, len);
		str[len] = '\0';

	}

	return err;
}
/*===========================================================================
 * Set Out-Bound Authentication.
*/
static int ppp_set_outbnd_auth (sdla_t *card, ppp_private_area_t *ppp_priv_area)
{
	ppp_mbox_t *mb = card->mbox;
	int err;

	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	memset(&mb->data, 0, (strlen(ppp_priv_area->userid) + 
					strlen(ppp_priv_area->passwd) + 2 ) );
	memcpy(mb->data, ppp_priv_area->userid, strlen(ppp_priv_area->userid));
	memcpy((mb->data + strlen(ppp_priv_area->userid) + 1), 
		ppp_priv_area->passwd, strlen(ppp_priv_area->passwd));	
	
	mb->cmd.length  = strlen(ppp_priv_area->userid) + 
					strlen(ppp_priv_area->passwd) + 2 ;
	
	mb->cmd.command = PPP_SET_OUTBOUND_AUTH;

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

	if (err != CMD_OK)
		ppp_error(card, err, mb);

	return err;
}

/*===========================================================================
 * Set In-Bound Authentication.
*/
static int ppp_set_inbnd_auth (sdla_t *card, ppp_private_area_t *ppp_priv_area)
{
	ppp_mbox_t *mb = card->mbox;
	int err, i;
	char* user_tokens[32];
	char* pass_tokens[32];
	int userids, passwds;
	int add_ptr;

	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	memset(&mb->data, 0, 1008);
	memcpy(mb->data, ppp_priv_area->sysname, 
						strlen(ppp_priv_area->sysname));
	
	/* Parse the userid string and the password string and build a string
	   to copy it to the data area of the command structure.   The string
	   will look like "SYS_NAME<NULL>USER1<NULL>PASS1<NULL>USER2<NULL>PASS2
	   ....<NULL> " 
	 */
	userids = tokenize( ppp_priv_area->userid, user_tokens);
	passwds = tokenize( ppp_priv_area->passwd, pass_tokens);
	
	if (userids != passwds){
		printk(KERN_INFO "%s: Number of passwords does not equal the number of user ids\n", card->devname);
		return 1;	
	}

	add_ptr = strlen(ppp_priv_area->sysname) + 1;
	for (i=0; i<userids; i++){
		memcpy((mb->data + add_ptr), user_tokens[i], 
							strlen(user_tokens[i]));
		memcpy((mb->data + add_ptr + strlen(user_tokens[i]) + 1), 
					pass_tokens[i], strlen(pass_tokens[i]));
		add_ptr = add_ptr + strlen(user_tokens[i]) + 1 + 
						strlen(pass_tokens[i]) + 1;
	}

	mb->cmd.length  = add_ptr + 1;
	mb->cmd.command = PPP_SET_INBOUND_AUTH;

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

	if (err != CMD_OK)
		ppp_error(card, err, mb);

	return err;
}


/*============================================================================
 * Tokenize string.
 *      Parse a string of the following syntax:
 *              <arg1>,<arg2>,...
 *      and fill array of tokens with pointers to string elements.
 *
 */
static int tokenize (char *str, char **tokens)
{
        int cnt = 0;

        tokens[0] = strsep(&str, "/");
        while (tokens[cnt] && (cnt < 32 - 1))
        {
                tokens[cnt] = strstrip(tokens[cnt], " \t");
                tokens[++cnt] = strsep(&str, "/");
        }
	return cnt;
}

/*============================================================================
 * Strip leading and trailing spaces off the string str.
 */
static char* strstrip (char *str, char* s)
{
        char *eos = str + strlen(str);          /* -> end of string */

        while (*str && strchr(s, *str))
                ++str                           /* strip leading spaces */
        ;
        while ((eos > str) && strchr(s, *(eos - 1)))
                --eos                           /* strip trailing spaces */
        ;
        *eos = '\0';
        return str;
}
/*============================================================================
 * Configure PPP firmware.
 */
static int ppp_configure(sdla_t *card, void *data)
{
	ppp_mbox_t *mb = card->mbox;
	int data_len = sizeof(ppp508_conf_t); 
	int err;

	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	memcpy(mb->data, data, data_len);
	mb->cmd.length  = data_len;
	mb->cmd.command = PPP_SET_CONFIG;
	err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;

	if (err != CMD_OK) 
		ppp_error(card, err, mb);
	
	return err;
}

/*============================================================================
 * Set interrupt mode.
 */
static int ppp_set_intr_mode(sdla_t *card, unsigned char mode)
{
	ppp_mbox_t *mb = card->mbox;
        ppp_intr_info_t *ppp_intr_data = (ppp_intr_info_t *) &mb->data[0];
	int err;

	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	ppp_intr_data->i_enable = mode;

	ppp_intr_data->irq = card->hw.irq;
	mb->cmd.length = 2;

       /* If timer has been enabled, set the timer delay to 1sec */
       if (mode & 0x80){
       		ppp_intr_data->timer_len = 250; //5;//100; //250;
                mb->cmd.length = 4;
        }
	
	mb->cmd.command = PPP_SET_INTR_FLAGS;
	err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
	
	if (err != CMD_OK) 
		ppp_error(card, err, mb);
 		

	return err;
}

/*============================================================================
 * Enable communications.
 */
static int ppp_comm_enable(sdla_t *card)
{
	ppp_mbox_t *mb = card->mbox;
	int err;

	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	mb->cmd.command = PPP_COMM_ENABLE;
	err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
	
	if (err != CMD_OK) 
		ppp_error(card, err, mb);
	else	
		card->u.p.comm_enabled = 1;	

	return err;
}

/*============================================================================
 * Disable communications.
 */
static int ppp_comm_disable(sdla_t *card)
{
	ppp_mbox_t *mb = card->mbox;
	int err;

	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	mb->cmd.command = PPP_COMM_DISABLE;
	err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
	if (err != CMD_OK) 
		ppp_error(card, err, mb);
	else
		card->u.p.comm_enabled = 0;

	return err;
}

static int ppp_comm_disable_shutdown(sdla_t *card)
{
	ppp_mbox_t *mb = card->mbox;
	ppp_intr_info_t *ppp_intr_data;
	int err;

	if (!mb){
		return 1;
	}
	
	ppp_intr_data = (ppp_intr_info_t *) &mb->data[0];
	
	/* Disable all interrupts */
	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	ppp_intr_data->i_enable = 0;

	ppp_intr_data->irq = card->hw.irq;
	mb->cmd.length = 2;

	mb->cmd.command = PPP_SET_INTR_FLAGS;
	err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;

	/* Disable communicatinons */
	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	mb->cmd.command = PPP_COMM_DISABLE;
	err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;

	card->u.p.comm_enabled = 0;

	return 0;
}



/*============================================================================
 * Get communications error statistics.
 */
static int ppp_get_err_stats(sdla_t *card)
{
	ppp_mbox_t *mb = card->mbox;
	int err;

	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	mb->cmd.command = PPP_READ_ERROR_STATS;
	err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
	
	if (err == CMD_OK) {
		
		ppp_err_stats_t* stats = (void*)mb->data;
		card->wandev.stats.rx_over_errors    = stats->rx_overrun;
		card->wandev.stats.rx_crc_errors     = stats->rx_bad_crc;
		card->wandev.stats.rx_missed_errors  = stats->rx_abort;
		card->wandev.stats.rx_length_errors  = stats->rx_lost;
		card->wandev.stats.tx_aborted_errors = stats->tx_abort;
	
	} else 
		ppp_error(card, err, mb);
	
	return err;
}

/*============================================================================
 * Send packet.
 *	Return:	0 - o.k.
 *		1 - no transmit buffers available
 */
static int ppp_send (sdla_t *card, void *data, unsigned len, unsigned proto)
{
	ppp_buf_ctl_t *txbuf = card->u.p.txbuf;

	if (txbuf->flag)
                return 1;
	
	sdla_poke(&card->hw, txbuf->buf.ptr, data, len);

	txbuf->length = len;		/* frame length */
	
	if (proto == htons(ETH_P_IPX))
		txbuf->proto = 0x01;	/* protocol ID */
	else
		txbuf->proto = 0x00;	/* protocol ID */
	
	txbuf->flag = 1;		/* start transmission */

	/* Update transmit buffer control fields */
	card->u.p.txbuf = ++txbuf;

	if ((void*)txbuf > card->u.p.txbuf_last)
		card->u.p.txbuf = card->u.p.txbuf_base;

	return 0;
}

/****** Firmware Error Handler **********************************************/

/*============================================================================
 * Firmware error handler.
 *	This routine is called whenever firmware command returns non-zero
 *	return code.
 *
 * Return zero if previous command has to be cancelled.
 */
static int ppp_error(sdla_t *card, int err, ppp_mbox_t *mb)
{
	unsigned cmd = mb->cmd.command;

	switch (err) {

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

		default:
			printk(KERN_INFO "%s: command 0x%02X returned 0x%02X!\n"
				, card->devname, cmd, err);
	}

	return 0;
}

/****** Interrupt Handlers **************************************************/

/*============================================================================
 * PPP interrupt service routine.
 */
static void wpp_isr (sdla_t *card)
{
	ppp_flags_t *flags = card->flags;
	char *ptr = &flags->iflag;
	struct net_device *dev = card->wandev.dev;
	int i;

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

	if (!dev && flags->iflag != PPP_INTR_CMD){
		card->in_isr = 0;
		flags->iflag = 0;
		return;
	}
	
	if (test_bit(PERI_CRIT, (void*)&card->wandev.critical)) {
		card->in_isr = 0;
		flags->iflag = 0;
		return;
	}
	
	
	if(card->hw.type != SDLA_S514){
		if (test_bit(SEND_CRIT, (void*)&card->wandev.critical)) {
			++card->statistics.isr_already_critical;
			printk (KERN_INFO "%s: Critical while in ISR!\n",
					card->devname);
			card->in_isr = 0;
			flags->iflag = 0;
			return;
		}
	}

	switch (flags->iflag) {

		case PPP_INTR_RXRDY:	/* receive interrupt  0x01  (bit 0)*/
			++card->statistics.isr_rx;
			rx_intr(card);
			break;

		case PPP_INTR_TXRDY:	/* transmit interrupt  0x02 (bit 1)*/
			++card->statistics.isr_tx;
			flags->imask &= ~PPP_INTR_TXRDY;
			netif_wake_queue(dev);
			break;

		case PPP_INTR_CMD:      /* interface command completed */
			++Intr_test_counter;
			++card->statistics.isr_intr_test;
			break;

		case PPP_INTR_MODEM:    /* modem status change (DCD, CTS) 0x04 (bit 2)*/
		case PPP_INTR_DISC:  	/* Data link disconnected 0x10  (bit 4)*/	
		case PPP_INTR_OPEN:   	/* Data link open 0x20  (bit 5)*/
		case PPP_INTR_DROP_DTR:	/* DTR drop timeout expired  0x40 bit 6 */
			event_intr(card);
			break;
	
		case PPP_INTR_TIMER:
			timer_intr(card);
			break;	 

		default:	/* unexpected interrupt */
			++card->statistics.isr_spurious;
			printk(KERN_INFO "%s: spurious interrupt 0x%02X!\n", 
				card->devname, flags->iflag);
			printk(KERN_INFO "%s: ID Bytes = ",card->devname);
	 		for(i = 0; i < 8; i ++)
				printk(KERN_INFO "0x%02X ", *(ptr + 0x28 + i));
			printk(KERN_INFO "\n");	
	}
	
	card->in_isr = 0;
	flags->iflag = 0;
	return;
}

/*============================================================================
 * Receive interrupt handler.
 */
static void rx_intr(sdla_t *card)
{
	ppp_buf_ctl_t *rxbuf = card->rxmb;
	struct net_device *dev = card->wandev.dev;
	ppp_private_area_t *ppp_priv_area;
	struct sk_buff *skb;
	unsigned len;
	void *buf;
	int i;
        ppp_flags_t *flags = card->flags;
        char *ptr = &flags->iflag;
	int udp_type;
	

	if (rxbuf->flag != 0x01) {

		printk(KERN_INFO 
			"%s: corrupted Rx buffer @ 0x%X, flag = 0x%02X!\n", 
			card->devname, (unsigned)rxbuf, rxbuf->flag);
	
		printk(KERN_INFO "%s: ID Bytes = ",card->devname);
	 	
		for(i = 0; i < 8; i ++)
			printk(KERN_INFO "0x%02X ", *(ptr + 0x28 + i));
		printk(KERN_INFO "\n");	
		
		++card->statistics.rx_intr_corrupt_rx_bfr;


		/* Bug Fix: Mar 6 2000
                 * If we get a corrupted mailbox, it means that driver 
                 * is out of sync with the firmware. There is no recovery.
                 * If we don't turn off all interrupts for this card
                 * the machine will crash. 
                 */
		printk(KERN_INFO "%s: Critical router failure ...!!!\n", card->devname);
		printk(KERN_INFO "Please contact Sangoma Technologies !\n");
		ppp_set_intr_mode(card,0);
		return;
	}
      
	if (dev && netif_running(dev) && dev->priv){
	
		len  = rxbuf->length;
		ppp_priv_area = dev->priv;

		/* Allocate socket buffer */
		skb = dev_alloc_skb(len);

		if (skb != NULL) {
		
			/* Copy data to the socket buffer */
			unsigned addr = rxbuf->buf.ptr;

			if ((addr + len) > card->u.p.rx_top + 1) {
			
				unsigned tmp = card->u.p.rx_top - addr + 1;
				buf = skb_put(skb, tmp);
				sdla_peek(&card->hw, addr, buf, tmp);
				addr = card->u.p.rx_base;
				len -= tmp;
			}
			buf = skb_put(skb, len);
			sdla_peek(&card->hw, addr, buf, len);

			/* Decapsulate packet */
        		switch (rxbuf->proto) {
	
				case 0x00:
					skb->protocol = htons(ETH_P_IP);
					break;

				case 0x01:
					skb->protocol = htons(ETH_P_IPX);
					break;
			}

			udp_type = udp_pkt_type( skb, card );

			if (udp_type == UDP_PTPIPE_TYPE){

				/* Handle a UDP Request in Timer Interrupt */
				if(store_udp_mgmt_pkt(UDP_PKT_FRM_NETWORK, card, skb, dev,
                	              			ppp_priv_area)){
	               			flags->imask |= PPP_INTR_TIMER;
				}
				++ppp_priv_area->rx_intr_stat.rx_intr_PIPE_request;


			} else if (handle_IPXWAN(skb->data,card->devname, 
						 ppp_priv_area->enable_IPX, 
						 ppp_priv_area->network_number, 
						 skb->protocol)) {
			
				/* Handle an IPXWAN packet */
				if( ppp_priv_area->enable_IPX) {
					
					/* Make sure we are not already sending */
					if (!test_bit(SEND_CRIT, &card->wandev.critical)){
					 	ppp_send(card, skb->data, skb->len, htons(ETH_P_IPX));
					}
					dev_kfree_skb_any(skb);

				} else {
					++card->wandev.stats.rx_dropped;
				}
			} else {
				/* Pass data up the protocol stack */
	    			skb->dev = dev;
				skb->mac.raw  = skb->data;

			    	++card->wandev.stats.rx_packets;
				card->wandev.stats.rx_bytes += skb->len;
		    		++ppp_priv_area->rx_intr_stat.rx_intr_bfr_passed_to_stack;	
				netif_rx(skb);
				dev->last_rx = jiffies;
			}

		} else {
	
			if (net_ratelimit()){
				printk(KERN_INFO "%s: no socket buffers available!\n",
					card->devname);
			}
			++card->wandev.stats.rx_dropped;
			++ppp_priv_area->rx_intr_stat.rx_intr_no_socket;
		}

	} else {
		++card->statistics.rx_intr_dev_not_started;
	}

	/* Release buffer element and calculate a pointer to the next one */
	rxbuf->flag = 0x00;
	card->rxmb = ++rxbuf;
	if ((void*)rxbuf > card->u.p.rxbuf_last)
		card->rxmb = card->u.p.rxbuf_base;
}


void event_intr (sdla_t *card)
{

 	struct net_device* dev = card->wandev.dev;
        ppp_private_area_t* ppp_priv_area = dev->priv;
	volatile ppp_flags_t *flags = card->flags;

	switch (flags->iflag){

		case PPP_INTR_MODEM:    /* modem status change (DCD, CTS) 0x04  (bit 2)*/

			if (net_ratelimit()){
				printk (KERN_INFO "%s: Modem status: DCD=%s CTS=%s\n",
					card->devname, DCD(flags->mstatus), CTS(flags->mstatus));
			}
			break;

		case PPP_INTR_DISC:  	/* Data link disconnected 0x10  (bit 4)*/	

			NEX_PRINTK (KERN_INFO "Data link disconnected intr Cause %X\n",
					       flags->disc_cause);

			if (flags->disc_cause &
				(PPP_LOCAL_TERMINATION | PPP_DCD_CTS_DROP |
				PPP_REMOTE_TERMINATION)) {

				if (card->u.p.ip_mode == WANOPT_PPP_PEER) { 
					set_bit(0,&Read_connection_info);
				}
				wanpipe_set_state(card, WAN_DISCONNECTED);

				show_disc_cause(card, flags->disc_cause);
				ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_PPP_EVENT;
				flags->imask |= PPP_INTR_TIMER;
				trigger_ppp_poll(dev);
			}
			break;

		case PPP_INTR_OPEN:   	/* Data link open 0x20  (bit 5)*/

			NEX_PRINTK (KERN_INFO "%s: PPP Link Open, LCP=%s IP=%s\n",
					card->devname,LCP(flags->lcp_state),
					IP(flags->ip_state));

			if (flags->lcp_state == 0x09 && 
                           (flags->ip_state == 0x09 || flags->ipx_state == 0x09)){

                                /* Initialize the polling timer and set the state
                                 * to WAN_CONNNECTED */


				/* BUG FIX: When the protocol restarts, during heavy 
                                 * traffic, board tx buffers and driver tx buffers
                                 * can go out of sync.  This checks the condition
                                 * and if the tx buffers are out of sync, the 
                                 * protocols are restarted. 
                                 * I don't know why the board tx buffer is out
                                 * of sync. It could be that a packets is tx
                                 * while the link is down, but that is not 
                                 * possible. The other possiblility is that the
                                 * firmware doesn't reinitialize properly.
                                 * FIXME: A better fix should be found.
                                 */ 
				if (detect_and_fix_tx_bug(card)){

					ppp_comm_disable(card);

					wanpipe_set_state(card, WAN_DISCONNECTED);

					ppp_priv_area->timer_int_enabled |= 
						TMR_INT_ENABLED_PPP_EVENT;
					flags->imask |= PPP_INTR_TIMER;
					break;	
				}

				card->state_tick = jiffies;
				wanpipe_set_state(card, WAN_CONNECTED);

				NEX_PRINTK(KERN_INFO "CON: L Tx: %lx  B Tx: %lx || L Rx %lx B Rx %lx\n",
					(unsigned long)card->u.p.txbuf, *card->u.p.txbuf_next,
					(unsigned long)card->rxmb, *card->u.p.rxbuf_next);

				/* Tell timer interrupt that PPP event occurred */
				ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_PPP_EVENT;
				flags->imask |= PPP_INTR_TIMER;

				/* If we are in PEER mode, we must first obtain the
				 * IP information and then go into the poll routine */
				if (card->u.p.ip_mode != WANOPT_PPP_PEER){	
					trigger_ppp_poll(dev);
				}
			}
                   	break;

		case PPP_INTR_DROP_DTR:		/* DTR drop timeout expired  0x40 bit 6 */

			NEX_PRINTK(KERN_INFO "DTR Drop Timeout Interrrupt \n"); 

			if (card->u.p.ip_mode == WANOPT_PPP_PEER) { 
				set_bit(0,&Read_connection_info);
			}
		
			wanpipe_set_state(card, WAN_DISCONNECTED);

			show_disc_cause(card, flags->disc_cause);
			ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_PPP_EVENT;
			flags->imask |= PPP_INTR_TIMER;
			trigger_ppp_poll(dev);
			break;
		
		default:
			printk(KERN_INFO "%s: Error, Invalid PPP Event\n",card->devname);
	}
}



/* TIMER INTERRUPT */

void timer_intr (sdla_t *card)
{

        struct net_device* dev = card->wandev.dev;
        ppp_private_area_t* ppp_priv_area = dev->priv;
	ppp_flags_t *flags = card->flags;


	if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_CONFIG){
		if (!config_ppp(card)){
			ppp_priv_area->timer_int_enabled &= 
					~TMR_INT_ENABLED_CONFIG;	
		}
	}

	/* Update statistics */
	if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_UPDATE){
		ppp_get_err_stats(card);
                if(!(--ppp_priv_area->update_comms_stats)){
			ppp_priv_area->timer_int_enabled &= 
				~TMR_INT_ENABLED_UPDATE;
		}
	}

	/* PPIPEMON UDP request */

	if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_UDP){
		process_udp_mgmt_pkt(card,dev, ppp_priv_area);
		ppp_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_UDP;
	}

	/* PPP Event */
	if (ppp_priv_area->timer_int_enabled & TMR_INT_ENABLED_PPP_EVENT){

		if (card->wandev.state == WAN_DISCONNECTED){
			retrigger_comm(card);
		}

		/* If the state is CONNECTING, it means that communicatins were
	 	 * enabled. When the remote side enables its comminication we
	 	 * should get an interrupt PPP_INTR_OPEN, thus turn off polling 
		 */

		else if (card->wandev.state == WAN_CONNECTING){
			/* Turn off the timer interrupt */
			ppp_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_PPP_EVENT;
		}

		/* If state is connected and we are in PEER mode 
	 	 * poll for an IP address which will be provided by remote end.
	 	 */
		else if ((card->wandev.state == WAN_CONNECTED && 
		  	  card->u.p.ip_mode == WANOPT_PPP_PEER) && 
		  	  test_bit(0,&Read_connection_info)){

			card->state_tick = jiffies;
			if (read_connection_info (card)){
				printk(KERN_INFO "%s: Failed to read PEER IP Addresses\n",
					card->devname);
			}else{
				clear_bit(0,&Read_connection_info);
				set_bit(1,&Read_connection_info);
				trigger_ppp_poll(dev);
			}
		}else{
			//FIXME Put the comment back int
			ppp_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_PPP_EVENT;
		}

	}/* End of PPP_EVENT */


	/* Only disable the timer interrupt if there are no udp, statistic */
	/* updates or events pending */
        if(!ppp_priv_area->timer_int_enabled) {
                flags->imask &= ~PPP_INTR_TIMER;
        }
}


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

	if( proto == htons(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] = 'P';
			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;
	}
}

/****** Background Polling Routines  ****************************************/

/* All polling functions are invoked by the TIMER interrupt in the wpp_isr 
 * routine.  
 */

/*============================================================================
 * Monitor active link phase.
 */
static void process_route (sdla_t *card)
{
	ppp_flags_t *flags = card->flags;
	struct net_device *dev = card->wandev.dev;
	ppp_private_area_t *ppp_priv_area = dev->priv;
	
	if ((card->u.p.ip_mode == WANOPT_PPP_PEER) &&
	    (flags->ip_state == 0x09)){ 

		/* We get ip_local from the firmware in PEER mode.
	         * Therefore, if ip_local is 0, we failed to obtain
         	 * the remote IP address. */
		if (ppp_priv_area->ip_local == 0) 
			return;
		
		printk(KERN_INFO "%s: IPCP State Opened.\n", card->devname);
		if (read_info( card )) {
   			printk(KERN_INFO 
				"%s: An error occurred in IP assignment.\n", 
				card->devname);
		} else {
			struct in_device *in_dev = dev->ip_ptr;
			if (in_dev != NULL ) {
				struct in_ifaddr *ifa = in_dev->ifa_list;

				printk(KERN_INFO "%s: Assigned Lcl. Addr: %u.%u.%u.%u\n", 
					card->devname, NIPQUAD(ifa->ifa_local));
				printk(KERN_INFO "%s: Assigned Rmt. Addr: %u.%u.%u.%u\n", 
						card->devname, NIPQUAD(ifa->ifa_address));
			}else{
				printk(KERN_INFO 
				"%s: Error: Failed to add a route for PPP interface %s\n",
					card->devname,dev->name);	
			}
		}
	}
}

/*============================================================================
 * Monitor physical link disconnected phase.
 *  o if interface is up and the hold-down timeout has expired, then retry
 *    connection.
 */
static void retrigger_comm(sdla_t *card)
{
	struct net_device *dev = card->wandev.dev;

	if (dev && ((jiffies - card->state_tick) > HOLD_DOWN_TIME)) {

		wanpipe_set_state(card, WAN_CONNECTING);

		if(ppp_comm_enable(card) == CMD_OK){
			init_ppp_tx_rx_buff( card );
		}	         
	}
}

/****** Miscellaneous Functions *********************************************/

/*============================================================================
 * Configure S508 adapter.
 */
static int config508(struct net_device *dev, sdla_t *card)
{
	ppp508_conf_t cfg;
	struct in_device *in_dev = dev->ip_ptr;
	ppp_private_area_t *ppp_priv_area = dev->priv;

	/* Prepare PPP configuration structure */
	memset(&cfg, 0, sizeof(ppp508_conf_t));

	if (card->wandev.clocking)
		cfg.line_speed = card->wandev.bps;

	if (card->wandev.interface == WANOPT_RS232)
		cfg.conf_flags |= INTERFACE_LEVEL_RS232;


        cfg.conf_flags 	|= DONT_TERMINATE_LNK_MAX_CONFIG; /*send Configure-Request packets forever*/
	cfg.txbuf_percent	= PERCENT_TX_BUFF;	/* % of Tx bufs */
	cfg.mtu_local		= card->wandev.mtu;
	cfg.mtu_remote		= card->wandev.mtu;                  /*    Default   */
	cfg.restart_tmr		= TIME_BETWEEN_CONF_REQ;  	     /*    30 = 3sec */
	cfg.auth_rsrt_tmr	= TIME_BETWEEN_PAP_CHAP_REQ;         /*    30 = 3sec */
	cfg.auth_wait_tmr	= WAIT_PAP_CHAP_WITHOUT_REPLY;       /*   300 = 30s  */
	cfg.mdm_fail_tmr	= WAIT_AFTER_DCD_CTS_LOW;            /*     5 = 0.5s */
	cfg.dtr_drop_tmr	= TIME_DCD_CTS_LOW_AFTER_LNK_DOWN;   /*    10 = 1s   */
	cfg.connect_tmout	= WAIT_DCD_HIGH_AFTER_ENABLE_COMM;   /*   900 = 90s  */
	cfg.conf_retry		= MAX_CONF_REQ_WITHOUT_REPLY;        /*    10 = 1s   */
	cfg.term_retry		= MAX_TERM_REQ_WITHOUT_REPLY;	     /*     2 times  */
	cfg.fail_retry		= NUM_CONF_NAK_WITHOUT_REPLY;        /*     5 times  */
	cfg.auth_retry		= NUM_AUTH_REQ_WITHOUT_REPLY;        /*     10 times */   


	if( !card->u.p.authenticator ) {
		printk(KERN_INFO "%s: Device is not configured as an authenticator\n", 
				card->devname);
		cfg.auth_options = NO_AUTHENTICATION;
	}else{
		printk(KERN_INFO "%s: Device is configured as an authenticator\n", 
				card->devname);
		cfg.auth_options = INBOUND_AUTH;
	}

	if( ppp_priv_area->pap == WANOPT_YES){
		cfg.auth_options |=PAP_AUTH;
		printk(KERN_INFO "%s: Pap enabled\n", card->devname);
	}
	if( ppp_priv_area->chap == WANOPT_YES){
		cfg.auth_options |= CHAP_AUTH;
		printk(KERN_INFO "%s: Chap enabled\n", card->devname);
	}


	if (ppp_priv_area->enable_IPX == WANOPT_YES){
		printk(KERN_INFO "%s: Enabling IPX Protocol\n",card->devname);
		cfg.ipx_options		= ENABLE_IPX | ROUTING_PROT_DEFAULT;
	}else{
		cfg.ipx_options 	= DISABLE_IPX;
	}

	switch (card->u.p.ip_mode) {
	
		case WANOPT_PPP_STATIC:

			printk(KERN_INFO "%s: PPP IP Mode: STATIC\n",card->devname);
			cfg.ip_options		= L_AND_R_IP_NO_ASSIG | 
							    ENABLE_IP;
			cfg.ip_local		= in_dev->ifa_list->ifa_local;
			cfg.ip_remote		= in_dev->ifa_list->ifa_address;
			/* Debugging code used to check that IP addresses
                         * obtained from the kernel are correct */

                        NEX_PRINTK(KERN_INFO "Local %u.%u.%u.%u Remote %u.%u.%u.%u Name %s\n",
					NIPQUAD(ip_local),NIPQUAD(ip_remote), dev->name);
			break;

		case WANOPT_PPP_HOST:

			printk(KERN_INFO "%s: PPP IP Mode: HOST\n",card->devname);
			cfg.ip_options		= L_IP_LOCAL_ASSIG |
						  R_IP_LOCAL_ASSIG | 
						  ENABLE_IP;
			cfg.ip_local		= in_dev->ifa_list->ifa_local;
			cfg.ip_remote		= in_dev->ifa_list->ifa_address;
			/* Debugging code used to check that IP addresses
                         * obtained from the kernel are correct */
                        NEX_PRINTK (KERN_INFO "Local %u.%u.%u.%u Remote %u.%u.%u.%u Name %s\n",
					NIPQUAD(ip_local),NIPQUAD(ip_remote), dev->name);
			
			break;
	
		case WANOPT_PPP_PEER:

			printk(KERN_INFO "%s: PPP IP Mode: PEER\n",card->devname);
			cfg.ip_options		= L_IP_REMOTE_ASSIG | 
						  R_IP_REMOTE_ASSIG | 
							  ENABLE_IP;
			cfg.ip_local		= 0x00;
			cfg.ip_remote		= 0x00;
			break;

		default:
			printk(KERN_INFO "%s: ERROR: Unsupported PPP Mode Selected\n",
					card->devname);
			printk(KERN_INFO "%s:        PPP IP Modes: STATIC, PEER or HOST\n",
					card->devname);	
			return 1;
	}

	return ppp_configure(card, &cfg);
}

/*============================================================================
 * Show disconnection cause.
 */
static void show_disc_cause(sdla_t *card, unsigned cause)
{
	if (cause & 0x0802) 

		printk(KERN_INFO "%s: link terminated by peer\n", 
			card->devname);

	else if (cause & 0x0004) 

		printk(KERN_INFO "%s: link terminated by user\n", 
			card->devname);

	else if (cause & 0x0008) 

		printk(KERN_INFO "%s: authentication failed\n", card->devname);
	
	else if (cause & 0x0010) 

		printk(KERN_INFO 
			"%s: authentication protocol negotiation failed\n", 
			card->devname);

	else if (cause & 0x0020) 
		
		printk(KERN_INFO
		"%s: peer's request for authentication rejected\n",
		card->devname);

	else if (cause & 0x0040) 
	
		printk(KERN_INFO "%s: MRU option rejected by peer\n", 
		card->devname);

	else if (cause & 0x0080) 
	
		printk(KERN_INFO "%s: peer's MRU was too small\n", 
		card->devname);

	else if (cause & 0x0100) 

		printk(KERN_INFO "%s: failed to negotiate peer's LCP options\n",
		card->devname);

	else if (cause & 0x0200) 
		
		printk(KERN_INFO "%s: failed to negotiate peer's IPCP options\n"
		, card->devname);

	else if (cause & 0x0400) 

		printk(KERN_INFO 
			"%s: failed to negotiate peer's IPXCP options\n",
			card->devname);
}

/*=============================================================================
 * Process UDP call of type PTPIPEAB.
 */
static void process_udp_mgmt_pkt(sdla_t *card, struct net_device *dev, 
				 ppp_private_area_t *ppp_priv_area ) 
{
	unsigned char buf2[5];
	unsigned char *buf;
	unsigned int frames, len;
	struct sk_buff *new_skb;
	unsigned short data_length, buffer_length, real_len;
	unsigned long data_ptr;
	int udp_mgmt_req_valid = 1;
	ppp_mbox_t *mbox = card->mbox;
	struct timeval tv;
	int err;
	ppp_udp_pkt_t *ppp_udp_pkt = (ppp_udp_pkt_t*)&ppp_priv_area->udp_pkt_data;

	memcpy(&buf2, &card->wandev.udp_port, 2 );


	if(ppp_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK) {

		switch(ppp_udp_pkt->cblock.command) {

			case PPIPE_GET_IBA_DATA:
			case PPP_READ_CONFIG:
			case PPP_GET_CONNECTION_INFO:
			case PPIPE_ROUTER_UP_TIME:
			case PPP_READ_STATISTICS:
			case PPP_READ_ERROR_STATS:
			case PPP_READ_PACKET_STATS:
			case PPP_READ_LCP_STATS:
			case PPP_READ_IPCP_STATS:
			case PPP_READ_IPXCP_STATS:
			case PPP_READ_PAP_STATS:
			case PPP_READ_CHAP_STATS:
			case PPP_READ_CODE_VERSION:
				udp_mgmt_req_valid = 1;
				break;
			   
			default:
				udp_mgmt_req_valid = 0;
				break;
		} 
	}
	
  	if(!udp_mgmt_req_valid) {
	    
		/* set length to 0 */
    		ppp_udp_pkt->cblock.length = 0x00;

    		/* set return code */
    		ppp_udp_pkt->cblock.result = 0xCD; 
		++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_direction_err;
	
		if (net_ratelimit()){	
			printk(KERN_INFO 
			"%s: Warning, Illegal UDP command attempted from network: %x\n",
			card->devname,ppp_udp_pkt->cblock.command);
		}
   	} else {
		/* Initialize the trace element */
		trace_element_t trace_element;		    

		switch (ppp_udp_pkt->cblock.command){

		/* PPIPE_ENABLE_TRACING */
    		case PPIPE_ENABLE_TRACING:
			if (!card->TracingEnabled) {
    			
				/* OPERATE_DATALINE_MONITOR */
    				mbox->cmd.command = PPP_DATALINE_MONITOR;
    				mbox->cmd.length = 0x01;
    				mbox->data[0] = ppp_udp_pkt->data[0];
	    			err = sdla_exec(mbox) ? 
					mbox->cmd.result : CMD_TIMEOUT;
	   
				if (err != CMD_OK) { 
	        			
					ppp_error(card, err, mbox);
	        			card->TracingEnabled = 0;
	        		
					/* set the return code */

		        		ppp_udp_pkt->cblock.result = mbox->cmd.result;
	        			mbox->cmd.length = 0;
	        			break;
	    			} 

				sdla_peek(&card->hw, 0xC000, &buf2, 2);
		    
				ppp_priv_area->curr_trace_addr = 0;
		    		memcpy(&ppp_priv_area->curr_trace_addr, &buf2, 2);
		    		ppp_priv_area->start_trace_addr = 
						ppp_priv_area->curr_trace_addr;
				ppp_priv_area->end_trace_addr = 
					ppp_priv_area->start_trace_addr + END_OFFSET;
		    	
				/* MAX_SEND_BUFFER_SIZE - 28 (IP header) 
				   - 32 (ppipemon CBLOCK) */
		    		available_buffer_space = MAX_LGTH_UDP_MGNT_PKT - 
							 sizeof(ip_pkt_t)-
							 sizeof(udp_pkt_t)-
							 sizeof(wp_mgmt_t)-
							 sizeof(cblock_t);
	       	  	}
	       	  	ppp_udp_pkt->cblock.result = 0;
	       	  	mbox->cmd.length = 0;
	       	  	card->TracingEnabled = 1;
	       	  	break;
	   
		/* PPIPE_DISABLE_TRACING */
		case PPIPE_DISABLE_TRACING:
	      		
			if(card->TracingEnabled) {
		   	
				/* OPERATE_DATALINE_MONITOR */
		    		mbox->cmd.command = 0x33;
		    		mbox->cmd.length = 1;
		    		mbox->data[0] = 0x00;
		    		err = sdla_exec(mbox) ? 
					mbox->cmd.result : CMD_TIMEOUT;
	       	  
			} 
		
			/*set return code*/
			ppp_udp_pkt->cblock.result = 0;
			mbox->cmd.length = 0;
			card->TracingEnabled = 0;
			break;
	   
		/* PPIPE_GET_TRACE_INFO */
		case PPIPE_GET_TRACE_INFO:

			if(!card->TracingEnabled) {
				/* set return code */
	    			ppp_udp_pkt->cblock.result = 1;
	    			mbox->cmd.length = 0;
			}		    

			buffer_length = 0;
			
			/* frames < 62, where 62 is the number of trace
			   information elements.  There is in total 496
			   bytes of space and each trace information
			   element is 8 bytes. 
			 */
			for ( frames=0; frames<62; frames++) {
	
				trace_pkt_t *trace_pkt = (trace_pkt_t *)
					&ppp_udp_pkt->data[buffer_length];
	
				/* Read the whole trace packet */
				sdla_peek(&card->hw, ppp_priv_area->curr_trace_addr, 
					  &trace_element, sizeof(trace_element_t));
	
				/* no data on board so exit */
				if( trace_element.opp_flag == 0x00 ) 
					break;
	      
				data_ptr = trace_element.trace_data_ptr;

				/* See if there is actual data on the trace buffer */
				if (data_ptr){
					data_length = trace_element.trace_length;
				}else{
					data_length = 0;
					ppp_udp_pkt->data[0] |= 0x02;
				}

				//FIXME: Do we need this check
				if ((available_buffer_space - buffer_length) 
				     < (sizeof(trace_element_t)+1)){
					
					/*indicate we have more frames 
					 * on board and exit 
					 */
					ppp_udp_pkt->data[0] |= 0x02;
					break;
				}
				
				trace_pkt->status = trace_element.trace_type;
				trace_pkt->time_stamp = trace_element.trace_time_stamp;
				trace_pkt->real_length = trace_element.trace_length;

				real_len = trace_element.trace_length;	
				
				if(data_ptr == 0){
					trace_pkt->data_avail = 0x00;
				}else{
					/* we can take it next time */
					if ((available_buffer_space - buffer_length)<
						(real_len + sizeof(trace_pkt_t))){
					
						ppp_udp_pkt->data[0] |= 0x02;
						break;
					} 
					trace_pkt->data_avail = 0x01;
				
					/* get the data */
					sdla_peek(&card->hw, data_ptr, 
						  &trace_pkt->data,
						  real_len);
				}	
				/* zero the opp flag to 
				   show we got the frame */
				buf2[0] = 0x00;
				sdla_poke(&card->hw, ppp_priv_area->curr_trace_addr,
					  &buf2, 1);

				/* now move onto the next 
				   frame */
				ppp_priv_area->curr_trace_addr += 8;

				/* check if we passed the last address */
				if ( ppp_priv_area->curr_trace_addr >= 
					ppp_priv_area->end_trace_addr){

					ppp_priv_area->curr_trace_addr = 
						ppp_priv_area->start_trace_addr;
				}
 
				/* update buffer length and make sure its even */ 

				if ( trace_pkt->data_avail == 0x01 ) {
					buffer_length += real_len - 1;
				}
 
				/* for the header */
				buffer_length += 8;

				if( buffer_length & 0x0001 )
					buffer_length += 1;
			}

			/* ok now set the total number of frames passed
			   in the high 5 bits */
			ppp_udp_pkt->data[0] |= (frames << 2);
	 
			/* set the data length */
			mbox->cmd.length = buffer_length;
			ppp_udp_pkt->cblock.length = buffer_length;
	 
			/* set return code */
			ppp_udp_pkt->cblock.result = 0;
	      	  	break;

   		/* PPIPE_GET_IBA_DATA */
		case PPIPE_GET_IBA_DATA:
	        
			mbox->cmd.length = 0x09;
		
			sdla_peek(&card->hw, 0xF003, &ppp_udp_pkt->data, 
					mbox->cmd.length);
	        
			/* set the length of the data */
			ppp_udp_pkt->cblock.length = 0x09;

			/* set return code */
			ppp_udp_pkt->cblock.result = 0x00;
			ppp_udp_pkt->cblock.result = 0;
			break;

		/* PPIPE_FT1_READ_STATUS */
		case PPIPE_FT1_READ_STATUS:
			sdla_peek(&card->hw, 0xF020, &ppp_udp_pkt->data[0], 2);
			ppp_udp_pkt->cblock.length = mbox->cmd.length = 2;
			ppp_udp_pkt->cblock.result = 0;
			break;
		
		case PPIPE_FLUSH_DRIVER_STATS:   
			init_ppp_priv_struct( ppp_priv_area );
			init_global_statistics( card );
			mbox->cmd.length = 0;
			ppp_udp_pkt->cblock.result = 0;
			break;

		
		case PPIPE_ROUTER_UP_TIME:

			do_gettimeofday( &tv );
			ppp_priv_area->router_up_time = tv.tv_sec - 
					ppp_priv_area->router_start_time;
			*(unsigned long *)&ppp_udp_pkt->data = ppp_priv_area->router_up_time;
			mbox->cmd.length = 4;
			ppp_udp_pkt->cblock.result = 0;
			break;

				/* PPIPE_DRIVER_STATISTICS */   
		case PPIPE_DRIVER_STAT_IFSEND:
			memcpy(&ppp_udp_pkt->data, &ppp_priv_area->if_send_stat, 
				sizeof(if_send_stat_t));


			ppp_udp_pkt->cblock.result = 0;
			ppp_udp_pkt->cblock.length = sizeof(if_send_stat_t);
			mbox->cmd.length = sizeof(if_send_stat_t);	
			break;

		case PPIPE_DRIVER_STAT_INTR:
			memcpy(&ppp_udp_pkt->data, &card->statistics, 
				sizeof(global_stats_t));

			memcpy(&ppp_udp_pkt->data+sizeof(global_stats_t),
				&ppp_priv_area->rx_intr_stat,
				sizeof(rx_intr_stat_t));

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

		case PPIPE_DRIVER_STAT_GEN:
			memcpy( &ppp_udp_pkt->data,
				&ppp_priv_area->pipe_mgmt_stat,
				sizeof(pipe_mgmt_stat_t));

			memcpy(&ppp_udp_pkt->data+sizeof(pipe_mgmt_stat_t), 
			       &card->statistics, sizeof(global_stats_t));

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


		/* FT1 MONITOR STATUS */
   		case FT1_MONITOR_STATUS_CTRL:
	
			/* Enable FT1 MONITOR STATUS */
	        	if( ppp_udp_pkt->data[0] == 1) {
			
				if( rCount++ != 0 ) {
		        		ppp_udp_pkt->cblock.result = 0;
	          			mbox->cmd.length = 1;
		  			break;
		    		}	
	      		}

	      		/* Disable FT1 MONITOR STATUS */
	      		if( ppp_udp_pkt->data[0] == 0) {

	      	   		if( --rCount != 0) {
		  			ppp_udp_pkt->cblock.result = 0;
		  			mbox->cmd.length = 1;
		  			break;
	   	    		} 
	      		} 	
			goto udp_dflt_cmd;
			
		/* WARNING: FIXME: This should be fixed.
		 * The FT1 Status Ctrl doesn't have a break
                 * statment.  Thus, no code must be inserted
                 * HERE: between default and above case statement */

		default:
udp_dflt_cmd:
	        
			/* it's a board command */
			mbox->cmd.command = ppp_udp_pkt->cblock.command;
			mbox->cmd.length = ppp_udp_pkt->cblock.length;
 
			if(mbox->cmd.length) {
				memcpy(&mbox->data,(unsigned char *)ppp_udp_pkt->data,
				       mbox->cmd.length);
	      		} 
	          
			/* run the command on the board */
			err = sdla_exec(mbox) ? mbox->cmd.result : CMD_TIMEOUT;
		
			if (err != CMD_OK) {
		
		    		ppp_error(card, err, mbox);
		    		++ppp_priv_area->pipe_mgmt_stat.
					 UDP_PIPE_mgmt_adptr_cmnd_timeout;
				break;
			}
	          
		  	++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_adptr_cmnd_OK;
		
			/* copy the result back to our buffer */
			memcpy(&ppp_udp_pkt->cblock,mbox, sizeof(cblock_t));
	          
			if(mbox->cmd.length) {
				memcpy(&ppp_udp_pkt->data,&mbox->data,mbox->cmd.length);
			} 

		} /* end of switch */
     	} /* end of else */

     	/* Fill UDP TTL */
     	ppp_udp_pkt->ip_pkt.ttl = card->wandev.ttl; 
     	len = reply_udp(ppp_priv_area->udp_pkt_data, mbox->cmd.length);

     	if (ppp_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK) {

		/* Make sure we are not already sending */
		if (!test_bit(SEND_CRIT,&card->wandev.critical)){
			++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_passed_to_adptr;
			ppp_send(card,ppp_priv_area->udp_pkt_data,len,ppp_priv_area->protocol);
		}

	} else {	
	
		/* Pass it up the stack
    		   Allocate socket buffer */
		if ((new_skb = dev_alloc_skb(len)) != NULL) {
	    	
			/* copy data into new_skb */

  	    		buf = skb_put(new_skb, len);
  	    		memcpy(buf,ppp_priv_area->udp_pkt_data, len);

	    		++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_passed_to_stack;
			
            		/* Decapsulate packet and pass it up the protocol 
			   stack */
	    		new_skb->protocol = htons(ETH_P_IP);
            		new_skb->dev = dev;
	    		new_skb->mac.raw  = new_skb->data;
			netif_rx(new_skb);
			dev->last_rx = jiffies;
		
		} else {
	    	
			++ppp_priv_area->pipe_mgmt_stat.UDP_PIPE_mgmt_no_socket;
			printk(KERN_INFO "no socket buffers available!\n");
  		}
    	}	

	ppp_priv_area->udp_pkt_lgth = 0;
	
	return; 
}

/*=============================================================================
 * Initial the ppp_private_area structure.
 */
static void init_ppp_priv_struct( ppp_private_area_t *ppp_priv_area )
{

	memset(&ppp_priv_area->if_send_stat, 0, sizeof(if_send_stat_t));
	memset(&ppp_priv_area->rx_intr_stat, 0, sizeof(rx_intr_stat_t));
	memset(&ppp_priv_area->pipe_mgmt_stat, 0, sizeof(pipe_mgmt_stat_t));	
}

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

/*============================================================================
 * Initialize Receive and Transmit Buffers.
 */
static void init_ppp_tx_rx_buff( sdla_t *card )
{
	ppp508_buf_info_t* info;

	if (card->hw.type == SDLA_S514) {
		
		info = (void*)(card->hw.dpmbase + PPP514_BUF_OFFS);

       		card->u.p.txbuf_base = (void*)(card->hw.dpmbase +
			info->txb_ptr);

                card->u.p.txbuf_last = (ppp_buf_ctl_t*)card->u.p.txbuf_base +
                        (info->txb_num - 1);

                card->u.p.rxbuf_base = (void*)(card->hw.dpmbase +
                        info->rxb_ptr);

                card->u.p.rxbuf_last = (ppp_buf_ctl_t*)card->u.p.rxbuf_base +
                        (info->rxb_num - 1);

	} else {
		
		info = (void*)(card->hw.dpmbase + PPP508_BUF_OFFS);

		card->u.p.txbuf_base = (void*)(card->hw.dpmbase +
			(info->txb_ptr - PPP508_MB_VECT));

		card->u.p.txbuf_last = (ppp_buf_ctl_t*)card->u.p.txbuf_base +
			(info->txb_num - 1);

		card->u.p.rxbuf_base = (void*)(card->hw.dpmbase +
			(info->rxb_ptr - PPP508_MB_VECT));

		card->u.p.rxbuf_last = (ppp_buf_ctl_t*)card->u.p.rxbuf_base +
			(info->rxb_num - 1);
	}

	card->u.p.txbuf_next = (unsigned long*)&info->txb_nxt; 
	card->u.p.rxbuf_next = (unsigned long*)&info->rxb1_ptr;

	card->u.p.rx_base = info->rxb_base;
        card->u.p.rx_top  = info->rxb_end;
      
	card->u.p.txbuf = card->u.p.txbuf_base;
	card->rxmb = card->u.p.rxbuf_base;

}

/*=============================================================================
 * Read Connection Information (ie for Remote IP address assginment).
 * Called when ppp interface connected.
 */
static int read_info( sdla_t *card )
{
	struct net_device *dev = card->wandev.dev;
	ppp_private_area_t *ppp_priv_area = dev->priv;
	int err;

	struct ifreq if_info;
	struct sockaddr_in *if_data1, *if_data2;
	mm_segment_t fs;

	/* Set Local and remote addresses */
	memset(&if_info, 0, sizeof(if_info));
	strcpy(if_info.ifr_name, dev->name);


	fs = get_fs();
	set_fs(get_ds());     /* get user space block */ 

	/* Change the local and remote ip address of the interface.
	 * This will also add in the destination route.
	 */	
	if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
	if_data1->sin_addr.s_addr = ppp_priv_area->ip_local;
	if_data1->sin_family = AF_INET;
	err = devinet_ioctl( SIOCSIFADDR, &if_info );
	if_data2 = (struct sockaddr_in *)&if_info.ifr_dstaddr;
	if_data2->sin_addr.s_addr = ppp_priv_area->ip_remote;
	if_data2->sin_family = AF_INET;
	err = devinet_ioctl( SIOCSIFDSTADDR, &if_info );

	set_fs(fs);           /* restore old block */
	
	if (err) {
		printk (KERN_INFO "%s: Adding of route failed: %i\n",
			card->devname,err);
		printk (KERN_INFO "%s:	Local : %u.%u.%u.%u\n",
			card->devname,NIPQUAD(ppp_priv_area->ip_local));
		printk (KERN_INFO "%s:	Remote: %u.%u.%u.%u\n",
			card->devname,NIPQUAD(ppp_priv_area->ip_remote));
	}
	return err;
}

/*=============================================================================
 * Remove Dynamic Route.
 * Called when ppp interface disconnected.
 */

static void remove_route( sdla_t *card )
{

	struct net_device *dev = card->wandev.dev;
	long ip_addr;
	int err;

        mm_segment_t fs;
	struct ifreq if_info;
	struct sockaddr_in *if_data1;
        struct in_device *in_dev = dev->ip_ptr;
        struct in_ifaddr *ifa = in_dev->ifa_list;	

	ip_addr = ifa->ifa_local;

	/* Set Local and remote addresses */
	memset(&if_info, 0, sizeof(if_info));
	strcpy(if_info.ifr_name, dev->name);

	fs = get_fs();
       	set_fs(get_ds());     /* get user space block */ 

	/* Change the local ip address of the interface to 0.
	 * This will also delete the destination route.
	 */	
	if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
	if_data1->sin_addr.s_addr = 0;
	if_data1->sin_family = AF_INET;
	err = devinet_ioctl( SIOCSIFADDR, &if_info );

        set_fs(fs);           /* restore old block */

	
	if (err) {
		printk (KERN_INFO "%s: Deleting dynamic route failed %d!\n",
			 card->devname, err);
		return;
	}else{
		printk (KERN_INFO "%s: PPP Deleting dynamic route %u.%u.%u.%u successfuly\n",
			card->devname, NIPQUAD(ip_addr));
	}
	return;
}

/*=============================================================================
 * Perform the Interrupt Test by running the READ_CODE_VERSION command MAX_INTR
 * _TEST_COUNTER times.
 */
static int intr_test( sdla_t *card )
{
	ppp_mbox_t *mb = card->mbox;
	int err,i;

	err = ppp_set_intr_mode( card, 0x08 );
	
	if (err == CMD_OK) { 
		
		for (i = 0; i < MAX_INTR_TEST_COUNTER; i ++) {	
			/* Run command READ_CODE_VERSION */
			memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
			mb->cmd.length  = 0;
			mb->cmd.command = PPP_READ_CODE_VERSION;
			err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;
			if (err != CMD_OK) 
				ppp_error(card, err, mb);
		}
	}
	else return err;

	err = ppp_set_intr_mode( card, 0 );
	if (err != CMD_OK) 
		return err;

	return 0;
}

/*==============================================================================
 * Determine what type of UDP call it is. DRVSTATS or PTPIPEAB ?
 */
static int udp_pkt_type( struct sk_buff *skb, sdla_t *card )
{
	unsigned char *sendpacket;
	unsigned char buf2[5]; 
	ppp_udp_pkt_t *ppp_udp_pkt = (ppp_udp_pkt_t *)skb->data; 
	
	sendpacket = skb->data;
	memcpy(&buf2, &card->wandev.udp_port, 2);
	
	if( 	ppp_udp_pkt->ip_pkt.ver_inet_hdr_length  == 0x45 &&        /* IP packet */ 
		sendpacket[9]  == 0x11 &&        /* UDP packet */
		sendpacket[22] == buf2[1] &&     /* UDP Port */
		sendpacket[23] == buf2[0] &&
		sendpacket[36] == 0x01 ) {
	
		if (    sendpacket[28] == 0x50 &&    /* PTPIPEAB: Signature */ 
			sendpacket[29] == 0x54 &&      
			sendpacket[30] == 0x50 &&      
			sendpacket[31] == 0x49 &&      
			sendpacket[32] == 0x50 &&      
			sendpacket[33] == 0x45 &&      
			sendpacket[34] == 0x41 &&      
			sendpacket[35] == 0x42 ){ 

			return UDP_PTPIPE_TYPE;
	
		} else if(sendpacket[28] == 0x44 &&  /* DRVSTATS: Signature */
			sendpacket[29] == 0x52 &&      
      			sendpacket[30] == 0x56 &&      
      			sendpacket[31] == 0x53 &&      
      			sendpacket[32] == 0x54 &&      
      			sendpacket[33] == 0x41 &&      
      			sendpacket[34] == 0x54 &&      
      			sendpacket[35] == 0x53 ){
	
			return UDP_DRVSTATS_TYPE;

		} else
			return UDP_INVALID_TYPE;

	} else
		return UDP_INVALID_TYPE;

}

/*============================================================================
 * Check to see if the packet to be transmitted contains a broadcast or
 * multicast source IP address.
 */

static int chk_bcast_mcast_addr(sdla_t *card, struct net_device* dev,
				struct sk_buff *skb)
{
	u32 src_ip_addr;
        u32 broadcast_ip_addr = 0;
        struct in_device *in_dev;

        /* read the IP source address from the outgoing packet */
        src_ip_addr = *(u32 *)(skb->data + 12);

	/* read the IP broadcast address for the device */
        in_dev = dev->ip_ptr;
        if(in_dev != NULL) {
                struct in_ifaddr *ifa= in_dev->ifa_list;
                if(ifa != NULL)
                        broadcast_ip_addr = ifa->ifa_broadcast;
                else
                        return 0;
        }
 
        /* check if the IP Source Address is a Broadcast address */
        if((dev->flags & IFF_BROADCAST) && (src_ip_addr == broadcast_ip_addr)) {
                printk(KERN_INFO "%s: Broadcast Source Address silently discarded\n",
				card->devname);
                return 1;
        } 

        /* check if the IP Source Address is a Multicast address */
        if((ntohl(src_ip_addr) >= 0xE0000001) &&
		(ntohl(src_ip_addr) <= 0xFFFFFFFE)) {
                printk(KERN_INFO "%s: Multicast Source Address silently discarded\n",
				card->devname);
                return 1;
        }

        return 0;
}

void s508_lock (sdla_t *card, unsigned long *smp_flags)
{
	spin_lock_irqsave(&card->wandev.lock, *smp_flags);
}

void s508_unlock (sdla_t *card, unsigned long *smp_flags)
{
        spin_unlock_irqrestore(&card->wandev.lock, *smp_flags);
}

static int read_connection_info (sdla_t *card)
{
	ppp_mbox_t *mb = card->mbox;
	struct net_device *dev = card->wandev.dev;
	ppp_private_area_t *ppp_priv_area = dev->priv;
	ppp508_connect_info_t *ppp508_connect_info;
	int err;

	memset(&mb->cmd, 0, sizeof(ppp_cmd_t));
	mb->cmd.length  = 0;
	mb->cmd.command = PPP_GET_CONNECTION_INFO;
	err = sdla_exec(mb) ? mb->cmd.result : CMD_TIMEOUT;

	if (err != CMD_OK) { 
		ppp_error(card, err, mb);
		ppp_priv_area->ip_remote = 0;
		ppp_priv_area->ip_local = 0;
	}
	else {
		ppp508_connect_info = (ppp508_connect_info_t *)mb->data;
		ppp_priv_area->ip_remote = ppp508_connect_info->ip_remote;
		ppp_priv_area->ip_local = ppp508_connect_info->ip_local;

		NEX_PRINTK(KERN_INFO "READ CONNECTION GOT IP ADDRESS %x, %x\n",
				ppp_priv_area->ip_remote,
				ppp_priv_area->ip_local);
	}

	return err;
}

/*===============================================================================
 * config_ppp
 *
 *	Configure the ppp protocol and enable communications.		
 *
 *   	The if_open function binds this function to the poll routine.
 *      Therefore, this function will run every time the ppp interface
 *      is brought up.  
 *      
 *	If the communications are not enabled, proceed to configure
 *      the card and enable communications.
 *
 *      If the communications are enabled, it means that the interface
 *      was shutdown by ether the user or driver. In this case, we 
 *      have to check that the IP addresses have not changed.  If
 *      the IP addresses changed, we have to reconfigure the firmware
 *      and update the changed IP addresses.  Otherwise, just exit.
 */
static int config_ppp (sdla_t *card)
{

	struct net_device *dev = card->wandev.dev;
	ppp_flags_t *flags = card->flags;
	ppp_private_area_t *ppp_priv_area = dev->priv;

	if (card->u.p.comm_enabled){

		if (ppp_priv_area->ip_local_tmp != ppp_priv_area->ip_local ||
		    ppp_priv_area->ip_remote_tmp != ppp_priv_area->ip_remote){
			
			/* The IP addersses have changed, we must
                         * stop the communications and reconfigure
                         * the card. Reason: the firmware must know
                         * the local and remote IP addresses. */
			disable_comm(card);
			wanpipe_set_state(card, WAN_DISCONNECTED);
			printk(KERN_INFO 
				"%s: IP addresses changed!\n",
					card->devname);
			printk(KERN_INFO "%s: Restarting communications ...\n",
					card->devname);
		}else{ 
			/* IP addresses are the same and the link is up, 
                         * we don't have to do anything here. Therefore, exit */
			return 0;
		}
	}

	/* Record the new IP addreses */
	ppp_priv_area->ip_local = ppp_priv_area->ip_local_tmp;
	ppp_priv_area->ip_remote = ppp_priv_area->ip_remote_tmp;

	if (config508(dev, card)){
		printk(KERN_INFO "%s: Failed to configure PPP device\n",
			card->devname);
		return 0;
	}

	if (ppp_set_intr_mode(card, PPP_INTR_RXRDY|
			    		PPP_INTR_TXRDY|
				    	PPP_INTR_MODEM|
				    	PPP_INTR_DISC |
				    	PPP_INTR_OPEN |
				    	PPP_INTR_DROP_DTR |
					PPP_INTR_TIMER)) {

		printk(KERN_INFO "%s: Failed to configure board interrupts !\n", 
			card->devname);
		return 0;
	}

        /* Turn off the transmit and timer interrupt */
	flags->imask &= ~(PPP_INTR_TXRDY | PPP_INTR_TIMER) ;


	/* If you are not the authenticator and any one of the protocol is 
	 * enabled then we call the set_out_bound_authentication.
	 */
	if ( !card->u.p.authenticator  && (ppp_priv_area->pap || ppp_priv_area->chap)) {
		if ( ppp_set_outbnd_auth(card, ppp_priv_area) ){
			printk(KERN_INFO "%s: Outbound authentication failed !\n",
				card->devname);
			return 0;
		}
	} 
	
	/* If you are the authenticator and any one of the protocol is enabled
	 * then we call the set_in_bound_authentication.
	 */
	if (card->u.p.authenticator && (ppp_priv_area->pap || ppp_priv_area->chap)){
		if (ppp_set_inbnd_auth(card, ppp_priv_area)){
			printk(KERN_INFO "%s: Inbound authentication failed !\n",
				card->devname);	
			return 0;
		}
	}

	/* If we fail to enable communications here it's OK,
	 * since the DTR timer will cause a disconnected, which
	 * will retrigger communication in timer_intr() */
	if (ppp_comm_enable(card) == CMD_OK) {
		wanpipe_set_state(card, WAN_CONNECTING);
		init_ppp_tx_rx_buff(card);
	}

	return 0; 
}

/*============================================================
 * ppp_poll
 *	
 * Rationale:
 * 	We cannot manipulate the routing tables, or
 *      ip addresses withing the interrupt. Therefore
 *      we must perform such actons outside an interrupt 
 *      at a later time. 
 *
 * Description:	
 *	PPP polling routine, responsible for 
 *     	shutting down interfaces upon disconnect
 *     	and adding/removing routes. 
 *      
 * Usage:        
 * 	This function is executed for each ppp  
 * 	interface through a tq_schedule bottom half.
 *      
 *      trigger_ppp_poll() function is used to kick
 *      the ppp_poll routine.  
 */
static void ppp_poll(struct net_device *dev)
{
	ppp_private_area_t *ppp_priv_area; 	
	sdla_t *card;
	u8 check_gateway=0;
	ppp_flags_t *flags;

	if (!dev || (ppp_priv_area = dev->priv) == NULL)
		return;

	card = ppp_priv_area->card;
	flags = card->flags;

	/* Shutdown is in progress, stop what you are 
	 * doing and get out */
	if (test_bit(PERI_CRIT,&card->wandev.critical)){
		clear_bit(POLL_CRIT,&card->wandev.critical);
		return;
	}

	/* if_open() function has triggered the polling routine
	 * to determine the configured IP addresses.  Once the
	 * addresses are found, trigger the chdlc configuration */
	if (test_bit(0,&ppp_priv_area->config_ppp)){

		ppp_priv_area->ip_local_tmp  = get_ip_address(dev,WAN_LOCAL_IP);
		ppp_priv_area->ip_remote_tmp = get_ip_address(dev,WAN_POINTOPOINT_IP);

		if (ppp_priv_area->ip_local_tmp == ppp_priv_area->ip_remote_tmp && 
	            card->u.p.ip_mode == WANOPT_PPP_HOST){
			
			if (++ppp_priv_area->ip_error > MAX_IP_ERRORS){
				printk(KERN_INFO "\n%s: --- WARNING ---\n",
						card->devname);
				printk(KERN_INFO "%s: The local IP address is the same as the\n",
						card->devname);
				printk(KERN_INFO "%s: Point-to-Point IP address.\n",
						card->devname);
				printk(KERN_INFO "%s: --- WARNING ---\n\n",
						card->devname);
			}else{
				clear_bit(POLL_CRIT,&card->wandev.critical);
				ppp_priv_area->poll_delay_timer.expires = jiffies+HZ;
				add_timer(&ppp_priv_area->poll_delay_timer);
				return;
			}
		}

		ppp_priv_area->timer_int_enabled |= TMR_INT_ENABLED_CONFIG;
		flags->imask |= PPP_INTR_TIMER;	
		ppp_priv_area->ip_error=0;	
		
		clear_bit(0,&ppp_priv_area->config_ppp);
		clear_bit(POLL_CRIT,&card->wandev.critical);
		return;
	}

	/* Dynamic interface implementation, as well as dynamic
	 * routing.  */
	
	switch (card->wandev.state) {
	
	case WAN_DISCONNECTED:

		/* If the dynamic interface configuration is on, and interface 
		 * is up, then bring down the netowrk interface */

		if (test_bit(DYN_OPT_ON,&ppp_priv_area->interface_down) &&
		    !test_bit(DEV_DOWN,&ppp_priv_area->interface_down)	&&	
		    card->wandev.dev->flags & IFF_UP){	

			printk(KERN_INFO "%s: Interface %s down.\n",
				card->devname,card->wandev.dev->name);
			change_dev_flags(card->wandev.dev,
					(card->wandev.dev->flags&~IFF_UP));
			set_bit(DEV_DOWN,&ppp_priv_area->interface_down);
		}else{
			/* We need to check if the local IP address is
               	   	 * zero. If it is, we shouldn't try to remove it.
                 	 * For some reason the kernel crashes badly if 
                 	 * we try to remove the route twice */

			if (card->wandev.dev->flags & IFF_UP && 
		    	    get_ip_address(card->wandev.dev,WAN_LOCAL_IP) &&
		    	    card->u.p.ip_mode == WANOPT_PPP_PEER){

				remove_route(card);
			}
		}
		break;

	case WAN_CONNECTED:
		
		/* In SMP machine this code can execute before the interface
		 * comes up.  In this case, we must make sure that we do not
		 * try to bring up the interface before dev_open() is finished */


		/* DEV_DOWN will be set only when we bring down the interface
		 * for the very first time. This way we know that it was us
		 * that brought the interface down */
		
		if (test_bit(DYN_OPT_ON,&ppp_priv_area->interface_down) &&
	            test_bit(DEV_DOWN,  &ppp_priv_area->interface_down) &&
 		    !(card->wandev.dev->flags & IFF_UP)){
			
			printk(KERN_INFO "%s: Interface %s up.\n",
				card->devname,card->wandev.dev->name);
			
			change_dev_flags(card->wandev.dev,(card->wandev.dev->flags|IFF_UP));
			clear_bit(DEV_DOWN,&ppp_priv_area->interface_down);
			check_gateway=1;
		}

		if ((card->u.p.ip_mode == WANOPT_PPP_PEER) && 
		    test_bit(1,&Read_connection_info)) { 
			
			process_route(card);
			clear_bit(1,&Read_connection_info);
			check_gateway=1;
		}

		if (ppp_priv_area->gateway && check_gateway)
			add_gateway(card,dev);

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

/*============================================================
 * trigger_ppp_poll
 *
 * Description:
 * 	Add a ppp_poll() task into a tq_scheduler bh handler
 *      for a specific interface.  This will kick
 *      the ppp_poll() routine at a later time. 
 *
 * Usage:
 * 	Interrupts use this to defer a taks to 
 *      a polling routine.
 *
 */	

static void trigger_ppp_poll(struct net_device *dev)
{
	ppp_private_area_t *ppp_priv_area;
	if ((ppp_priv_area=dev->priv) != NULL){ 	
		
		sdla_t *card = ppp_priv_area->card;

		if (test_bit(PERI_CRIT,&card->wandev.critical)){
			return;
		}
		
		if (test_and_set_bit(POLL_CRIT,&card->wandev.critical)){
			return;
		}

		schedule_work(&ppp_priv_area->poll_work);
	}
	return;
}

static void ppp_poll_delay (unsigned long dev_ptr)
{
	struct net_device *dev = (struct net_device *)dev_ptr;
	trigger_ppp_poll(dev);
}

/*============================================================
 * detect_and_fix_tx_bug
 *
 * Description:
 *	On connect, if the board tx buffer ptr is not the same
 *      as the driver tx buffer ptr, we found a firmware bug.
 *      Report the bug to the above layer.  To fix the
 *      error restart communications again.
 *
 * Usage:
 *
 */	

static int detect_and_fix_tx_bug (sdla_t *card)
{
	if (((unsigned long)card->u.p.txbuf_base&0xFFF) != ((*card->u.p.txbuf_next)&0xFFF)){
		NEX_PRINTK(KERN_INFO "Major Error, Fix the bug\n");
		return 1;
	}
	return 0;
}

MODULE_LICENSE("GPL");

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