summaryrefslogtreecommitdiff
path: root/packages/linux/linux-mtx-2-2.4.27/48-pptp.patch
blob: 5896f9037099ee7d0700616b271a040c88d6aac0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
diff -uNr linux_org/Documentation/Configure.help linux/Documentation/Configure.help
--- linux_org/Documentation/Configure.help	2006-10-27 14:08:20.000000000 +0200
+++ linux/Documentation/Configure.help	2006-10-27 14:11:52.000000000 +0200
@@ -2848,6 +2848,31 @@
   If you want to compile it as a module, say M here and read
   <file:Documentation/modules.txt>.  If unsure, say `Y'.
 
+PPTP conntrack and NAT support
+CONFIG_IP_NF_PPTP
+  This module adds support for PPTP (Point to Point Tunnelling Protocol, 
+  RFC2637) conncection tracking and NAT. 
+
+  If you are running PPTP sessions over a stateful firewall or NAT box,
+  you may want to enable this feature.  
+
+  Please note that not all PPTP modes of operation are supported yet.
+  For more info, read top of the file net/ipv4/netfilter/ip_conntrack_pptp.c
+
+  If you want to compile it as a module, say M here and read
+  Documentation/modules.txt.  If unsure, say `N'.
+
+GRE protocol conntrack and NAT support
+CONFIG_IP_NF_CT_PROTO_GRE
+  This module adds generic support for connection tracking and NAT of the
+  GRE protocol (RFC1701, RFC2784).  Please note that this will only work
+  with GRE connections using the key field of the GRE header.
+
+  You will need GRE support to enable PPTP support.
+
+  If you want to compile it as a module, say `M' here and read
+  Documentation/modules.txt.  If unsire, say `N'.
+
 User space queueing via NETLINK
 CONFIG_IP_NF_QUEUE
   Netfilter has the ability to queue packets to user space: the
diff -uNr linux_org/include/linux/netfilter_ipv4/ip_conntrack.h linux/include/linux/netfilter_ipv4/ip_conntrack.h
--- linux_org/include/linux/netfilter_ipv4/ip_conntrack.h	2004-11-24 12:13:57.000000000 +0100
+++ linux/include/linux/netfilter_ipv4/ip_conntrack.h	2006-10-27 14:11:52.000000000 +0200
@@ -50,19 +50,23 @@
 
 #include <linux/netfilter_ipv4/ip_conntrack_tcp.h>
 #include <linux/netfilter_ipv4/ip_conntrack_icmp.h>
+#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
 
 /* per conntrack: protocol private data */
 union ip_conntrack_proto {
 	/* insert conntrack proto private data here */
+	struct ip_ct_gre gre;
 	struct ip_ct_tcp tcp;
 	struct ip_ct_icmp icmp;
 };
 
 union ip_conntrack_expect_proto {
 	/* insert expect proto private data here */
+	struct ip_ct_gre_expect gre;
 };
 
 /* Add protocol helper include file here */
+#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
 #include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
 
 #include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
@@ -71,6 +75,7 @@
 /* per expectation: application helper private data */
 union ip_conntrack_expect_help {
 	/* insert conntrack helper private data (expect) here */
+	struct ip_ct_pptp_expect exp_pptp_info;
 	struct ip_ct_amanda_expect exp_amanda_info;
 	struct ip_ct_ftp_expect exp_ftp_info;
 	struct ip_ct_irc_expect exp_irc_info;
@@ -85,16 +90,19 @@
 /* per conntrack: application helper private data */
 union ip_conntrack_help {
 	/* insert conntrack helper private data (master) here */
+	struct ip_ct_pptp_master ct_pptp_info;
 	struct ip_ct_ftp_master ct_ftp_info;
 	struct ip_ct_irc_master ct_irc_info;
 };
 
 #ifdef CONFIG_IP_NF_NAT_NEEDED
 #include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_pptp.h>
 
 /* per conntrack: nat application helper private data */
 union ip_conntrack_nat_help {
 	/* insert nat helper private data here */
+	struct ip_nat_pptp nat_pptp_info;
 };
 #endif
 
diff -uNr linux_org/include/linux/netfilter_ipv4/ip_conntrack_pptp.h linux/include/linux/netfilter_ipv4/ip_conntrack_pptp.h
--- linux_org/include/linux/netfilter_ipv4/ip_conntrack_pptp.h	1970-01-01 01:00:00.000000000 +0100
+++ linux/include/linux/netfilter_ipv4/ip_conntrack_pptp.h	2006-10-27 14:11:52.000000000 +0200
@@ -0,0 +1,313 @@
+/* PPTP constants and structs */
+#ifndef _CONNTRACK_PPTP_H
+#define _CONNTRACK_PPTP_H
+
+/* state of the control session */
+enum pptp_ctrlsess_state {
+	PPTP_SESSION_NONE,			/* no session present */
+	PPTP_SESSION_ERROR,			/* some session error */
+	PPTP_SESSION_STOPREQ,			/* stop_sess request seen */
+	PPTP_SESSION_REQUESTED,			/* start_sess request seen */
+	PPTP_SESSION_CONFIRMED,			/* session established */
+};
+
+/* state of the call inside the control session */
+enum pptp_ctrlcall_state {
+	PPTP_CALL_NONE,
+	PPTP_CALL_ERROR,
+	PPTP_CALL_OUT_REQ,
+	PPTP_CALL_OUT_CONF,
+	PPTP_CALL_IN_REQ,
+	PPTP_CALL_IN_REP,
+	PPTP_CALL_IN_CONF,
+	PPTP_CALL_CLEAR_REQ,
+};
+
+
+/* conntrack private data */
+struct ip_ct_pptp_master {
+	enum pptp_ctrlsess_state sstate;	/* session state */
+
+	/* everything below is going to be per-expectation in newnat,
+	 * since there could be more than one call within one session */
+	enum pptp_ctrlcall_state cstate;	/* call state */
+	u_int16_t pac_call_id;			/* call id of PAC, host byte order */
+	u_int16_t pns_call_id;			/* call id of PNS, host byte order */
+};
+
+/* conntrack_expect private member */
+struct ip_ct_pptp_expect {
+	enum pptp_ctrlcall_state cstate; 	/* call state */
+	u_int16_t pac_call_id;			/* call id of PAC */
+	u_int16_t pns_call_id;			/* call id of PNS */
+};
+
+
+#ifdef __KERNEL__
+
+#include <linux/netfilter_ipv4/lockhelp.h>
+DECLARE_LOCK_EXTERN(ip_pptp_lock);
+
+#define IP_CONNTR_PPTP		PPTP_CONTROL_PORT
+
+union pptp_ctrl_union {
+                void				*rawreq;
+		struct PptpStartSessionRequest	*sreq;
+		struct PptpStartSessionReply	*srep;
+		struct PptpStopSessionReqest	*streq;
+		struct PptpStopSessionReply	*strep;
+                struct PptpOutCallRequest       *ocreq;
+                struct PptpOutCallReply         *ocack;
+                struct PptpInCallRequest        *icreq;
+                struct PptpInCallReply          *icack;
+                struct PptpInCallConnected      *iccon;
+		struct PptpClearCallRequest	*clrreq;
+                struct PptpCallDisconnectNotify *disc;
+                struct PptpWanErrorNotify       *wanerr;
+                struct PptpSetLinkInfo          *setlink;
+};
+
+
+
+#define PPTP_CONTROL_PORT	1723
+
+#define PPTP_PACKET_CONTROL	1
+#define PPTP_PACKET_MGMT	2
+
+#define PPTP_MAGIC_COOKIE	0x1a2b3c4d
+
+struct pptp_pkt_hdr {
+	__u16	packetLength;
+	__u16	packetType;
+	__u32	magicCookie;
+};
+
+/* PptpControlMessageType values */
+#define PPTP_START_SESSION_REQUEST	1
+#define PPTP_START_SESSION_REPLY	2
+#define PPTP_STOP_SESSION_REQUEST	3
+#define PPTP_STOP_SESSION_REPLY		4
+#define PPTP_ECHO_REQUEST		5
+#define PPTP_ECHO_REPLY			6
+#define PPTP_OUT_CALL_REQUEST		7
+#define PPTP_OUT_CALL_REPLY		8
+#define PPTP_IN_CALL_REQUEST		9
+#define PPTP_IN_CALL_REPLY		10
+#define PPTP_IN_CALL_CONNECT		11
+#define PPTP_CALL_CLEAR_REQUEST		12
+#define PPTP_CALL_DISCONNECT_NOTIFY	13
+#define PPTP_WAN_ERROR_NOTIFY		14
+#define PPTP_SET_LINK_INFO		15
+
+#define PPTP_MSG_MAX			15
+
+/* PptpGeneralError values */
+#define PPTP_ERROR_CODE_NONE		0
+#define PPTP_NOT_CONNECTED		1
+#define PPTP_BAD_FORMAT			2
+#define PPTP_BAD_VALUE			3
+#define PPTP_NO_RESOURCE		4
+#define PPTP_BAD_CALLID			5
+#define PPTP_REMOVE_DEVICE_ERROR	6
+
+struct PptpControlHeader {
+	__u16	messageType;
+	__u16	reserved;
+};
+
+/* FramingCapability Bitmap Values */
+#define PPTP_FRAME_CAP_ASYNC		0x1
+#define PPTP_FRAME_CAP_SYNC		0x2
+
+/* BearerCapability Bitmap Values */
+#define PPTP_BEARER_CAP_ANALOG		0x1
+#define PPTP_BEARER_CAP_DIGITAL		0x2
+
+struct PptpStartSessionRequest {
+	__u16	protocolVersion;
+	__u8	reserved1;
+	__u8	reserved2;
+	__u32	framingCapability;
+	__u32	bearerCapability;
+	__u16	maxChannels;
+	__u16	firmwareRevision;
+	__u8	hostName[64];
+	__u8	vendorString[64];
+};
+
+/* PptpStartSessionResultCode Values */
+#define PPTP_START_OK			1
+#define PPTP_START_GENERAL_ERROR	2
+#define PPTP_START_ALREADY_CONNECTED	3
+#define PPTP_START_NOT_AUTHORIZED	4
+#define PPTP_START_UNKNOWN_PROTOCOL	5
+
+struct PptpStartSessionReply {
+	__u16	protocolVersion;
+	__u8	resultCode;
+	__u8	generalErrorCode;
+	__u32	framingCapability;
+	__u32	bearerCapability;
+	__u16	maxChannels;
+	__u16	firmwareRevision;
+	__u8	hostName[64];
+	__u8	vendorString[64];
+};
+
+/* PptpStopReasons */
+#define PPTP_STOP_NONE			1
+#define PPTP_STOP_PROTOCOL		2
+#define PPTP_STOP_LOCAL_SHUTDOWN	3
+
+struct PptpStopSessionRequest {
+	__u8	reason;
+};
+
+/* PptpStopSessionResultCode */
+#define PPTP_STOP_OK			1
+#define PPTP_STOP_GENERAL_ERROR		2
+
+struct PptpStopSessionReply {
+	__u8	resultCode;
+	__u8	generalErrorCode;
+};
+
+struct PptpEchoRequest {
+	__u32 identNumber;
+};
+
+/* PptpEchoReplyResultCode */
+#define PPTP_ECHO_OK			1
+#define PPTP_ECHO_GENERAL_ERROR		2
+
+struct PptpEchoReply {
+	__u32	identNumber;
+	__u8	resultCode;
+	__u8	generalErrorCode;
+	__u16	reserved;
+};
+
+/* PptpFramingType */
+#define PPTP_ASYNC_FRAMING		1
+#define PPTP_SYNC_FRAMING		2
+#define PPTP_DONT_CARE_FRAMING		3
+
+/* PptpCallBearerType */
+#define PPTP_ANALOG_TYPE		1
+#define PPTP_DIGITAL_TYPE		2
+#define PPTP_DONT_CARE_BEARER_TYPE	3
+
+struct PptpOutCallRequest {
+	__u16	callID;
+	__u16	callSerialNumber;
+	__u32	minBPS;
+	__u32	maxBPS;
+	__u32	bearerType;
+	__u32	framingType;
+	__u16	packetWindow;
+	__u16	packetProcDelay;
+	__u16	reserved1;
+	__u16	phoneNumberLength;
+	__u16	reserved2;
+	__u8	phoneNumber[64];
+	__u8	subAddress[64];
+};
+
+/* PptpCallResultCode */
+#define PPTP_OUTCALL_CONNECT		1
+#define PPTP_OUTCALL_GENERAL_ERROR	2
+#define PPTP_OUTCALL_NO_CARRIER		3
+#define PPTP_OUTCALL_BUSY		4
+#define PPTP_OUTCALL_NO_DIAL_TONE	5
+#define PPTP_OUTCALL_TIMEOUT		6
+#define PPTP_OUTCALL_DONT_ACCEPT	7
+
+struct PptpOutCallReply {
+	__u16	callID;
+	__u16	peersCallID;
+	__u8	resultCode;
+	__u8	generalErrorCode;
+	__u16	causeCode;
+	__u32	connectSpeed;
+	__u16	packetWindow;
+	__u16	packetProcDelay;
+	__u32	physChannelID;
+};
+
+struct PptpInCallRequest {
+	__u16	callID;
+	__u16	callSerialNumber;
+	__u32	callBearerType;
+	__u32	physChannelID;
+	__u16	dialedNumberLength;
+	__u16	dialingNumberLength;
+	__u8	dialedNumber[64];
+	__u8	dialingNumber[64];
+	__u8	subAddress[64];
+};
+
+/* PptpInCallResultCode */
+#define PPTP_INCALL_ACCEPT		1
+#define PPTP_INCALL_GENERAL_ERROR	2
+#define PPTP_INCALL_DONT_ACCEPT		3
+
+struct PptpInCallReply {
+	__u16	callID;
+	__u16	peersCallID;
+	__u8	resultCode;
+	__u8	generalErrorCode;
+	__u16	packetWindow;
+	__u16	packetProcDelay;
+	__u16	reserved;
+};
+
+struct PptpInCallConnected {
+	__u16	peersCallID;
+	__u16	reserved;
+	__u32	connectSpeed;
+	__u16	packetWindow;
+	__u16	packetProcDelay;
+	__u32	callFramingType;
+};
+
+struct PptpClearCallRequest {
+	__u16	callID;
+	__u16	reserved;
+};
+
+struct PptpCallDisconnectNotify {
+	__u16	callID;
+	__u8	resultCode;
+	__u8	generalErrorCode;
+	__u16	causeCode;
+	__u16	reserved;
+	__u8	callStatistics[128];
+};
+
+struct PptpWanErrorNotify {
+	__u16	peersCallID;
+	__u16	reserved;
+	__u32	crcErrors;
+	__u32	framingErrors;
+	__u32	hardwareOverRuns;
+	__u32	bufferOverRuns;
+	__u32	timeoutErrors;
+	__u32	alignmentErrors;
+};
+
+struct PptpSetLinkInfo {
+	__u16	peersCallID;
+	__u16	reserved;
+	__u32	sendAccm;
+	__u32	recvAccm;
+};
+
+
+struct pptp_priv_data {
+	__u16	call_id;
+	__u16	mcall_id;
+	__u16	pcall_id;
+};
+
+#endif /* __KERNEL__ */
+#endif /* _CONNTRACK_PPTP_H */
diff -uNr linux_org/include/linux/netfilter_ipv4/ip_conntrack_proto_gre.h linux/include/linux/netfilter_ipv4/ip_conntrack_proto_gre.h
--- linux_org/include/linux/netfilter_ipv4/ip_conntrack_proto_gre.h	1970-01-01 01:00:00.000000000 +0100
+++ linux/include/linux/netfilter_ipv4/ip_conntrack_proto_gre.h	2006-10-27 14:11:52.000000000 +0200
@@ -0,0 +1,123 @@
+#ifndef _CONNTRACK_PROTO_GRE_H
+#define _CONNTRACK_PROTO_GRE_H
+#include <asm/byteorder.h>
+
+/* GRE PROTOCOL HEADER */
+
+/* GRE Version field */
+#define GRE_VERSION_1701	0x0
+#define GRE_VERSION_PPTP	0x1
+
+/* GRE Protocol field */
+#define GRE_PROTOCOL_PPTP	0x880B
+
+/* GRE Flags */
+#define GRE_FLAG_C		0x80
+#define GRE_FLAG_R		0x40
+#define GRE_FLAG_K		0x20
+#define GRE_FLAG_S		0x10
+#define GRE_FLAG_A		0x80
+
+#define GRE_IS_C(f)	((f)&GRE_FLAG_C)
+#define GRE_IS_R(f)	((f)&GRE_FLAG_R)
+#define GRE_IS_K(f)	((f)&GRE_FLAG_K)
+#define GRE_IS_S(f)	((f)&GRE_FLAG_S)
+#define GRE_IS_A(f)	((f)&GRE_FLAG_A)
+
+/* GRE is a mess: Four different standards */
+struct gre_hdr {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	__u16	rec:3,
+		srr:1,
+		seq:1,
+		key:1,
+		routing:1,
+		csum:1,
+		version:3,
+		reserved:4,
+		ack:1;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+	__u16	csum:1,
+		routing:1,
+		key:1,
+		seq:1,
+		srr:1,
+		rec:3,
+		ack:1,
+		reserved:4,
+		version:3;
+#else
+#error "Adjust your <asm/byteorder.h> defines"
+#endif
+	__u16	protocol;
+};
+
+/* modified GRE header for PPTP */
+struct gre_hdr_pptp {
+	__u8  flags;		/* bitfield */
+	__u8  version;		/* should be GRE_VERSION_PPTP */
+	__u16 protocol;		/* should be GRE_PROTOCOL_PPTP */
+	__u16 payload_len;	/* size of ppp payload, not inc. gre header */
+	__u16 call_id;		/* peer's call_id for this session */
+	__u32 seq;		/* sequence number.  Present if S==1 */
+	__u32 ack;		/* seq number of highest packet recieved by */
+				/*  sender in this session */
+};
+
+
+/* this is part of ip_conntrack */
+struct ip_ct_gre {
+	unsigned int stream_timeout;
+	unsigned int timeout;
+};
+
+/* this is part of ip_conntrack_expect */
+struct ip_ct_gre_expect {
+	struct ip_ct_gre_keymap *keymap_orig, *keymap_reply;
+};
+
+#ifdef __KERNEL__
+struct ip_conntrack_expect;
+
+/* structure for original <-> reply keymap */
+struct ip_ct_gre_keymap {
+	struct list_head list;
+
+	struct ip_conntrack_tuple tuple;
+};
+
+
+/* add new tuple->key_reply pair to keymap */
+int ip_ct_gre_keymap_add(struct ip_conntrack_expect *exp,
+			 struct ip_conntrack_tuple *t,
+			 int reply);
+
+/* change an existing keymap entry */
+void ip_ct_gre_keymap_change(struct ip_ct_gre_keymap *km,
+			     struct ip_conntrack_tuple *t);
+
+/* delete keymap entries */
+void ip_ct_gre_keymap_destroy(struct ip_conntrack_expect *exp);
+
+
+/* get pointer to gre key, if present */
+static inline u_int32_t *gre_key(struct gre_hdr *greh)
+{
+	if (!greh->key)
+		return NULL;
+	if (greh->csum || greh->routing)
+		return (u_int32_t *) (greh+sizeof(*greh)+4);
+	return (u_int32_t *) (greh+sizeof(*greh));
+}
+
+/* get pointer ot gre csum, if present */
+static inline u_int16_t *gre_csum(struct gre_hdr *greh)
+{
+	if (!greh->csum)
+		return NULL;
+	return (u_int16_t *) (greh+sizeof(*greh));
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _CONNTRACK_PROTO_GRE_H */
diff -uNr linux_org/include/linux/netfilter_ipv4/ip_conntrack_tuple.h linux/include/linux/netfilter_ipv4/ip_conntrack_tuple.h
--- linux_org/include/linux/netfilter_ipv4/ip_conntrack_tuple.h	2003-11-17 02:07:46.000000000 +0100
+++ linux/include/linux/netfilter_ipv4/ip_conntrack_tuple.h	2006-10-27 14:11:52.000000000 +0200
@@ -14,7 +14,7 @@
 union ip_conntrack_manip_proto
 {
 	/* Add other protocols here. */
-	u_int16_t all;
+	u_int32_t all;
 
 	struct {
 		u_int16_t port;
@@ -25,6 +25,9 @@
 	struct {
 		u_int16_t id;
 	} icmp;
+	struct {
+		u_int32_t key;
+	} gre;
 };
 
 /* The manipulable part of the tuple. */
@@ -44,7 +47,7 @@
 		u_int32_t ip;
 		union {
 			/* Add other protocols here. */
-			u_int16_t all;
+			u_int64_t all;
 
 			struct {
 				u_int16_t port;
@@ -55,6 +58,11 @@
 			struct {
 				u_int8_t type, code;
 			} icmp;
+			struct {
+				u_int16_t protocol;
+				u_int8_t version;
+				u_int32_t key;
+			} gre;
 		} u;
 
 		/* The protocol. */
@@ -80,10 +88,16 @@
 #ifdef __KERNEL__
 
 #define DUMP_TUPLE(tp)						\
-DEBUGP("tuple %p: %u %u.%u.%u.%u:%hu -> %u.%u.%u.%u:%hu\n",	\
+DEBUGP("tuple %p: %u %u.%u.%u.%u:%u -> %u.%u.%u.%u:%u\n",	\
        (tp), (tp)->dst.protonum,				\
-       NIPQUAD((tp)->src.ip), ntohs((tp)->src.u.all),		\
-       NIPQUAD((tp)->dst.ip), ntohs((tp)->dst.u.all))
+       NIPQUAD((tp)->src.ip), ntohl((tp)->src.u.all),		\
+       NIPQUAD((tp)->dst.ip), ntohl((tp)->dst.u.all))
+
+#define DUMP_TUPLE_RAW(x) 						\
+	DEBUGP("tuple %p: %u %u.%u.%u.%u:0x%08x -> %u.%u.%u.%u:0x%08x\n",\
+	(x), (x)->dst.protonum,						\
+	NIPQUAD((x)->src.ip), ntohl((x)->src.u.all), 			\
+	NIPQUAD((x)->dst.ip), ntohl((x)->dst.u.all))
 
 #define CTINFO2DIR(ctinfo) ((ctinfo) >= IP_CT_IS_REPLY ? IP_CT_DIR_REPLY : IP_CT_DIR_ORIGINAL)
 
diff -uNr linux_org/include/linux/netfilter_ipv4/ip_conntrack_tuple.h.orig linux/include/linux/netfilter_ipv4/ip_conntrack_tuple.h.orig
--- linux_org/include/linux/netfilter_ipv4/ip_conntrack_tuple.h.orig	1970-01-01 01:00:00.000000000 +0100
+++ linux/include/linux/netfilter_ipv4/ip_conntrack_tuple.h.orig	2003-11-17 02:07:46.000000000 +0100
@@ -0,0 +1,139 @@
+#ifndef _IP_CONNTRACK_TUPLE_H
+#define _IP_CONNTRACK_TUPLE_H
+
+/* A `tuple' is a structure containing the information to uniquely
+  identify a connection.  ie. if two packets have the same tuple, they
+  are in the same connection; if not, they are not.
+
+  We divide the structure along "manipulatable" and
+  "non-manipulatable" lines, for the benefit of the NAT code.
+*/
+
+/* The protocol-specific manipulable parts of the tuple: always in
+   network order! */
+union ip_conntrack_manip_proto
+{
+	/* Add other protocols here. */
+	u_int16_t all;
+
+	struct {
+		u_int16_t port;
+	} tcp;
+	struct {
+		u_int16_t port;
+	} udp;
+	struct {
+		u_int16_t id;
+	} icmp;
+};
+
+/* The manipulable part of the tuple. */
+struct ip_conntrack_manip
+{
+	u_int32_t ip;
+	union ip_conntrack_manip_proto u;
+};
+
+/* This contains the information to distinguish a connection. */
+struct ip_conntrack_tuple
+{
+	struct ip_conntrack_manip src;
+
+	/* These are the parts of the tuple which are fixed. */
+	struct {
+		u_int32_t ip;
+		union {
+			/* Add other protocols here. */
+			u_int16_t all;
+
+			struct {
+				u_int16_t port;
+			} tcp;
+			struct {
+				u_int16_t port;
+			} udp;
+			struct {
+				u_int8_t type, code;
+			} icmp;
+		} u;
+
+		/* The protocol. */
+		u_int16_t protonum;
+	} dst;
+};
+
+/* This is optimized opposed to a memset of the whole structure.  Everything we
+ * really care about is the  source/destination unions */
+#define IP_CT_TUPLE_U_BLANK(tuple) 				\
+	do {							\
+		(tuple)->src.u.all = 0;				\
+		(tuple)->dst.u.all = 0;				\
+	} while (0)
+
+enum ip_conntrack_dir
+{
+	IP_CT_DIR_ORIGINAL,
+	IP_CT_DIR_REPLY,
+	IP_CT_DIR_MAX
+};
+
+#ifdef __KERNEL__
+
+#define DUMP_TUPLE(tp)						\
+DEBUGP("tuple %p: %u %u.%u.%u.%u:%hu -> %u.%u.%u.%u:%hu\n",	\
+       (tp), (tp)->dst.protonum,				\
+       NIPQUAD((tp)->src.ip), ntohs((tp)->src.u.all),		\
+       NIPQUAD((tp)->dst.ip), ntohs((tp)->dst.u.all))
+
+#define CTINFO2DIR(ctinfo) ((ctinfo) >= IP_CT_IS_REPLY ? IP_CT_DIR_REPLY : IP_CT_DIR_ORIGINAL)
+
+/* If we're the first tuple, it's the original dir. */
+#define DIRECTION(h) ((enum ip_conntrack_dir)(&(h)->ctrack->tuplehash[1] == (h)))
+
+/* Connections have two entries in the hash table: one for each way */
+struct ip_conntrack_tuple_hash
+{
+	struct list_head list;
+
+	struct ip_conntrack_tuple tuple;
+
+	/* this == &ctrack->tuplehash[DIRECTION(this)]. */
+	struct ip_conntrack *ctrack;
+};
+
+#endif /* __KERNEL__ */
+
+static inline int ip_ct_tuple_src_equal(const struct ip_conntrack_tuple *t1,
+				        const struct ip_conntrack_tuple *t2)
+{
+	return t1->src.ip == t2->src.ip
+		&& t1->src.u.all == t2->src.u.all;
+}
+
+static inline int ip_ct_tuple_dst_equal(const struct ip_conntrack_tuple *t1,
+				        const struct ip_conntrack_tuple *t2)
+{
+	return t1->dst.ip == t2->dst.ip
+		&& t1->dst.u.all == t2->dst.u.all
+		&& t1->dst.protonum == t2->dst.protonum;
+}
+
+static inline int ip_ct_tuple_equal(const struct ip_conntrack_tuple *t1,
+				    const struct ip_conntrack_tuple *t2)
+{
+	return ip_ct_tuple_src_equal(t1, t2) && ip_ct_tuple_dst_equal(t1, t2);
+}
+
+static inline int ip_ct_tuple_mask_cmp(const struct ip_conntrack_tuple *t,
+				       const struct ip_conntrack_tuple *tuple,
+				       const struct ip_conntrack_tuple *mask)
+{
+	return !(((t->src.ip ^ tuple->src.ip) & mask->src.ip)
+		 || ((t->dst.ip ^ tuple->dst.ip) & mask->dst.ip)
+		 || ((t->src.u.all ^ tuple->src.u.all) & mask->src.u.all)
+		 || ((t->dst.u.all ^ tuple->dst.u.all) & mask->dst.u.all)
+		 || ((t->dst.protonum ^ tuple->dst.protonum)
+		     & mask->dst.protonum));
+}
+
+#endif /* _IP_CONNTRACK_TUPLE_H */
diff -uNr linux_org/include/linux/netfilter_ipv4/ip_nat_pptp.h linux/include/linux/netfilter_ipv4/ip_nat_pptp.h
--- linux_org/include/linux/netfilter_ipv4/ip_nat_pptp.h	1970-01-01 01:00:00.000000000 +0100
+++ linux/include/linux/netfilter_ipv4/ip_nat_pptp.h	2006-10-27 14:11:52.000000000 +0200
@@ -0,0 +1,11 @@
+/* PPTP constants and structs */
+#ifndef _NAT_PPTP_H
+#define _NAT_PPTP_H
+
+/* conntrack private data */
+struct ip_nat_pptp {
+	u_int16_t pns_call_id;		/* NAT'ed PNS call id */
+	u_int16_t pac_call_id;		/* NAT'ed PAC call id */
+};
+
+#endif /* _NAT_PPTP_H */
diff -uNr linux_org/net/ipv4/netfilter/Config.in linux/net/ipv4/netfilter/Config.in
--- linux_org/net/ipv4/netfilter/Config.in	2003-08-13 19:19:30.000000000 +0200
+++ linux/net/ipv4/netfilter/Config.in	2006-10-27 14:11:52.000000000 +0200
@@ -7,6 +7,11 @@
 tristate 'Connection tracking (required for masq/NAT)' CONFIG_IP_NF_CONNTRACK
 if [ "$CONFIG_IP_NF_CONNTRACK" != "n" ]; then
   dep_tristate '  FTP protocol support' CONFIG_IP_NF_FTP $CONFIG_IP_NF_CONNTRACK
+  dep_tristate '  GRE protocol support' CONFIG_IP_NF_CT_PROTO_GRE $CONFIG_IP_NF_CONNTRACK
+  dep_tristate '  PPTP protocol support' CONFIG_IP_NF_PPTP $CONFIG_IP_NF_CONNTRACK
+  if [ "$CONFIG_IP_NF_PPTP" != "n" ]; then
+	bool   '    PPTP verbose debug' CONFIG_IP_NF_PPTP_DEBUG
+  fi
   dep_tristate '  Amanda protocol support' CONFIG_IP_NF_AMANDA $CONFIG_IP_NF_CONNTRACK
   dep_tristate '  TFTP protocol support' CONFIG_IP_NF_TFTP $CONFIG_IP_NF_CONNTRACK
   dep_tristate '  IRC protocol support' CONFIG_IP_NF_IRC $CONFIG_IP_NF_CONNTRACK
@@ -67,6 +72,20 @@
         fi
       fi
       bool '    NAT of local connections (READ HELP)' CONFIG_IP_NF_NAT_LOCAL
+      if [ "$CONFIG_IP_NF_PPTP" = "m" ]; then
+        define_tristate CONFIG_IP_NF_NAT_PPTP m
+      else
+        if [ "$CONFIG_IP_NF_PPTP" = "y" ]; then
+          define_tristate CONFIG_IP_NF_NAT_PPTP $CONFIG_IP_NF_NAT
+        fi
+      fi
+      if [ "$CONFIG_IP_NF_CT_PROTO_GRE" = "m" ]; then
+        define_tristate CONFIG_IP_NF_NAT_PROTO_GRE m
+      else
+        if [ "$CONFIG_IP_NF_CT_PROTO_GRE" = "y" ]; then
+	  define_tristate CONFIG_IP_NF_NAT_PROTO_GRE $CONFIG_IP_NF_NAT
+	fi
+      fi
       if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
         dep_tristate '    Basic SNMP-ALG support (EXPERIMENTAL)' CONFIG_IP_NF_NAT_SNMP_BASIC $CONFIG_IP_NF_NAT
       fi
diff -uNr linux_org/net/ipv4/netfilter/Makefile linux/net/ipv4/netfilter/Makefile
--- linux_org/net/ipv4/netfilter/Makefile	2003-08-13 19:19:30.000000000 +0200
+++ linux/net/ipv4/netfilter/Makefile	2006-10-27 14:11:52.000000000 +0200
@@ -30,8 +30,21 @@
 
 # connection tracking
 obj-$(CONFIG_IP_NF_CONNTRACK) += ip_conntrack.o
+ 
+# connection tracking protocol helpers
+obj-$(CONFIG_IP_NF_CT_PROTO_GRE) += ip_conntrack_proto_gre.o
+ifdef CONFIG_IP_NF_CT_PROTO_GRE
+	export-objs += ip_conntrack_proto_gre.o
+endif
+
+# NAT protocol helpers
+obj-$(CONFIG_IP_NF_NAT_PROTO_GRE) += ip_nat_proto_gre.o
 
 # connection tracking helpers
+obj-$(CONFIG_IP_NF_PPTP) += ip_conntrack_pptp.o
+ifdef CONFIG_IP_NF_NAT_PPTP
+	export-objs += ip_conntrack_pptp.o
+endif
 obj-$(CONFIG_IP_NF_AMANDA) += ip_conntrack_amanda.o
 ifdef CONFIG_IP_NF_AMANDA
 	export-objs += ip_conntrack_amanda.o
@@ -49,6 +62,7 @@
 endif
 
 # NAT helpers 
+obj-$(CONFIG_IP_NF_NAT_PPTP) += ip_nat_pptp.o
 obj-$(CONFIG_IP_NF_NAT_AMANDA) += ip_nat_amanda.o
 obj-$(CONFIG_IP_NF_NAT_TFTP) += ip_nat_tftp.o
 obj-$(CONFIG_IP_NF_NAT_FTP) += ip_nat_ftp.o
diff -uNr linux_org/net/ipv4/netfilter/ip_conntrack_core.c linux/net/ipv4/netfilter/ip_conntrack_core.c
--- linux_org/net/ipv4/netfilter/ip_conntrack_core.c	2004-11-24 12:14:04.000000000 +0100
+++ linux/net/ipv4/netfilter/ip_conntrack_core.c	2006-10-27 14:11:52.000000000 +0200
@@ -142,6 +142,8 @@
 	tuple->dst.ip = iph->daddr;
 	tuple->dst.protonum = iph->protocol;
 
+	tuple->src.u.all = tuple->dst.u.all = 0;
+
 	ret = protocol->pkt_to_tuple((u_int32_t *)iph + iph->ihl,
 				     len - 4*iph->ihl,
 				     tuple);
@@ -157,6 +159,8 @@
 	inverse->dst.ip = orig->src.ip;
 	inverse->dst.protonum = orig->dst.protonum;
 
+	inverse->src.u.all = inverse->dst.u.all = 0;
+
 	return protocol->invert_tuple(inverse, orig);
 }
 
@@ -945,8 +949,8 @@
 	 * so there is no need to use the tuple lock too */
 
 	DEBUGP("ip_conntrack_expect_related %p\n", related_to);
-	DEBUGP("tuple: "); DUMP_TUPLE(&expect->tuple);
-	DEBUGP("mask:  "); DUMP_TUPLE(&expect->mask);
+	DEBUGP("tuple: "); DUMP_TUPLE_RAW(&expect->tuple);
+	DEBUGP("mask:  "); DUMP_TUPLE_RAW(&expect->mask);
 
 	old = LIST_FIND(&ip_conntrack_expect_list, resent_expect,
 		        struct ip_conntrack_expect *, &expect->tuple, 
@@ -1063,15 +1067,14 @@
 
 	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
 	WRITE_LOCK(&ip_conntrack_expect_tuple_lock);
-
 	DEBUGP("change_expect:\n");
-	DEBUGP("exp tuple: "); DUMP_TUPLE(&expect->tuple);
-	DEBUGP("exp mask:  "); DUMP_TUPLE(&expect->mask);
-	DEBUGP("newtuple:  "); DUMP_TUPLE(newtuple);
+	DEBUGP("exp tuple: "); DUMP_TUPLE_RAW(&expect->tuple);
+	DEBUGP("exp mask:  "); DUMP_TUPLE_RAW(&expect->mask);
+	DEBUGP("newtuple:  "); DUMP_TUPLE_RAW(newtuple);
 	if (expect->ct_tuple.dst.protonum == 0) {
 		/* Never seen before */
 		DEBUGP("change expect: never seen before\n");
-		if (!ip_ct_tuple_equal(&expect->tuple, newtuple) 
+		if (!ip_ct_tuple_mask_cmp(&expect->tuple, newtuple, &expect->mask)
 		    && LIST_FIND(&ip_conntrack_expect_list, expect_clash,
 			         struct ip_conntrack_expect *, newtuple, &expect->mask)) {
 			/* Force NAT to find an unused tuple */
diff -uNr linux_org/net/ipv4/netfilter/ip_conntrack_core.c.orig linux/net/ipv4/netfilter/ip_conntrack_core.c.orig
--- linux_org/net/ipv4/netfilter/ip_conntrack_core.c.orig	1970-01-01 01:00:00.000000000 +0100
+++ linux/net/ipv4/netfilter/ip_conntrack_core.c.orig	2004-11-24 12:14:04.000000000 +0100
@@ -0,0 +1,1446 @@
+/* Connection state tracking for netfilter.  This is separated from,
+   but required by, the NAT layer; it can also be used by an iptables
+   extension. */
+
+/* (c) 1999 Paul `Rusty' Russell.  Licenced under the GNU General
+ * Public Licence. 
+ *
+ * 23 Apr 2001: Harald Welte <laforge@gnumonks.org>
+ * 	- new API and handling of conntrack/nat helpers
+ * 	- now capable of multiple expectations for one master
+ * 16 Jul 2002: Harald Welte <laforge@gnumonks.org>
+ * 	- add usage/reference counts to ip_conntrack_expect
+ *	- export ip_conntrack[_expect]_{find_get,put} functions
+ * */
+
+#include <linux/version.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <linux/vmalloc.h>
+#include <linux/brlock.h>
+#include <net/checksum.h>
+#include <linux/stddef.h>
+#include <linux/sysctl.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/jhash.h>
+/* For ERR_PTR().  Yeah, I know... --RR */
+#include <linux/fs.h>
+
+/* This rwlock protects the main hash table, protocol/helper/expected
+   registrations, conntrack timers*/
+#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_conntrack_lock)
+#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_conntrack_lock)
+
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#define IP_CONNTRACK_VERSION	"2.1"
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+DECLARE_RWLOCK(ip_conntrack_lock);
+DECLARE_RWLOCK(ip_conntrack_expect_tuple_lock);
+
+void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack) = NULL;
+LIST_HEAD(ip_conntrack_expect_list);
+LIST_HEAD(protocol_list);
+static LIST_HEAD(helpers);
+unsigned int ip_conntrack_htable_size = 0;
+int ip_conntrack_max = 0;
+static atomic_t ip_conntrack_count = ATOMIC_INIT(0);
+struct list_head *ip_conntrack_hash;
+static kmem_cache_t *ip_conntrack_cachep;
+
+extern struct ip_conntrack_protocol ip_conntrack_generic_protocol;
+
+static inline int proto_cmpfn(const struct ip_conntrack_protocol *curr,
+			      u_int8_t protocol)
+{
+	return protocol == curr->proto;
+}
+
+struct ip_conntrack_protocol *__ip_ct_find_proto(u_int8_t protocol)
+{
+	struct ip_conntrack_protocol *p;
+
+	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+	p = LIST_FIND(&protocol_list, proto_cmpfn,
+		      struct ip_conntrack_protocol *, protocol);
+	if (!p)
+		p = &ip_conntrack_generic_protocol;
+
+	return p;
+}
+
+struct ip_conntrack_protocol *ip_ct_find_proto(u_int8_t protocol)
+{
+	struct ip_conntrack_protocol *p;
+
+	READ_LOCK(&ip_conntrack_lock);
+	p = __ip_ct_find_proto(protocol);
+	READ_UNLOCK(&ip_conntrack_lock);
+	return p;
+}
+
+inline void 
+ip_conntrack_put(struct ip_conntrack *ct)
+{
+	IP_NF_ASSERT(ct);
+	IP_NF_ASSERT(ct->infos[0].master);
+	/* nf_conntrack_put wants to go via an info struct, so feed it
+           one at random. */
+	nf_conntrack_put(&ct->infos[0]);
+}
+
+static int ip_conntrack_hash_rnd_initted;
+static unsigned int ip_conntrack_hash_rnd;
+
+static u_int32_t
+hash_conntrack(const struct ip_conntrack_tuple *tuple)
+{
+#if 0
+	dump_tuple(tuple);
+#endif
+	return (jhash_3words(tuple->src.ip,
+	                     (tuple->dst.ip ^ tuple->dst.protonum),
+	                     (tuple->src.u.all | (tuple->dst.u.all << 16)),
+	                     ip_conntrack_hash_rnd) % ip_conntrack_htable_size);
+}
+
+inline int
+get_tuple(const struct iphdr *iph, size_t len,
+	  struct ip_conntrack_tuple *tuple,
+	  struct ip_conntrack_protocol *protocol)
+{
+	int ret;
+
+	/* Never happen */
+	if (iph->frag_off & htons(IP_OFFSET)) {
+		printk("ip_conntrack_core: Frag of proto %u.\n",
+		       iph->protocol);
+		return 0;
+	}
+	/* Guarantee 8 protocol bytes: if more wanted, use len param */
+	else if (iph->ihl * 4 + 8 > len)
+		return 0;
+
+	tuple->src.ip = iph->saddr;
+	tuple->dst.ip = iph->daddr;
+	tuple->dst.protonum = iph->protocol;
+
+	ret = protocol->pkt_to_tuple((u_int32_t *)iph + iph->ihl,
+				     len - 4*iph->ihl,
+				     tuple);
+	return ret;
+}
+
+static int
+invert_tuple(struct ip_conntrack_tuple *inverse,
+	     const struct ip_conntrack_tuple *orig,
+	     const struct ip_conntrack_protocol *protocol)
+{
+	inverse->src.ip = orig->dst.ip;
+	inverse->dst.ip = orig->src.ip;
+	inverse->dst.protonum = orig->dst.protonum;
+
+	return protocol->invert_tuple(inverse, orig);
+}
+
+
+/* ip_conntrack_expect helper functions */
+
+/* Compare tuple parts depending on mask. */
+static inline int expect_cmp(const struct ip_conntrack_expect *i,
+			     const struct ip_conntrack_tuple *tuple)
+{
+	MUST_BE_READ_LOCKED(&ip_conntrack_expect_tuple_lock);
+	return ip_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask);
+}
+
+static void
+destroy_expect(struct ip_conntrack_expect *exp)
+{
+	DEBUGP("destroy_expect(%p) use=%d\n", exp, atomic_read(&exp->use));
+	IP_NF_ASSERT(atomic_read(&exp->use) == 0);
+	IP_NF_ASSERT(!timer_pending(&exp->timeout));
+
+	kfree(exp);
+}
+
+inline void ip_conntrack_expect_put(struct ip_conntrack_expect *exp)
+{
+	IP_NF_ASSERT(exp);
+
+	if (atomic_dec_and_test(&exp->use)) {
+		/* usage count dropped to zero */
+		destroy_expect(exp);
+	}
+}
+
+static inline struct ip_conntrack_expect *
+__ip_ct_expect_find(const struct ip_conntrack_tuple *tuple)
+{
+	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+	MUST_BE_READ_LOCKED(&ip_conntrack_expect_tuple_lock);
+	return LIST_FIND(&ip_conntrack_expect_list, expect_cmp, 
+			 struct ip_conntrack_expect *, tuple);
+}
+
+/* Find a expectation corresponding to a tuple. */
+struct ip_conntrack_expect *
+ip_conntrack_expect_find_get(const struct ip_conntrack_tuple *tuple)
+{
+	struct ip_conntrack_expect *exp;
+
+	READ_LOCK(&ip_conntrack_lock);
+	READ_LOCK(&ip_conntrack_expect_tuple_lock);
+	exp = __ip_ct_expect_find(tuple);
+	if (exp)
+		atomic_inc(&exp->use);
+	READ_UNLOCK(&ip_conntrack_expect_tuple_lock);
+	READ_UNLOCK(&ip_conntrack_lock);
+
+	return exp;
+}
+
+/* remove one specific expectation from all lists and drop refcount,
+ * does _NOT_ delete the timer. */
+static void __unexpect_related(struct ip_conntrack_expect *expect)
+{
+	DEBUGP("unexpect_related(%p)\n", expect);
+	MUST_BE_WRITE_LOCKED(&ip_conntrack_lock);
+
+	/* we're not allowed to unexpect a confirmed expectation! */
+	IP_NF_ASSERT(!expect->sibling);
+
+	/* delete from global and local lists */
+	list_del(&expect->list);
+	list_del(&expect->expected_list);
+
+	/* decrement expect-count of master conntrack */
+	if (expect->expectant)
+		expect->expectant->expecting--;
+
+	ip_conntrack_expect_put(expect);
+}
+
+/* remove one specific expecatation from all lists, drop refcount
+ * and expire timer. 
+ * This function can _NOT_ be called for confirmed expects! */
+static void unexpect_related(struct ip_conntrack_expect *expect)
+{
+	IP_NF_ASSERT(expect->expectant);
+	IP_NF_ASSERT(expect->expectant->helper);
+	/* if we are supposed to have a timer, but we can't delete
+	 * it: race condition.  __unexpect_related will
+	 * be calledd by timeout function */
+	if (expect->expectant->helper->timeout
+	    && !del_timer(&expect->timeout))
+		return;
+
+	__unexpect_related(expect);
+}
+
+/* delete all unconfirmed expectations for this conntrack */
+static void remove_expectations(struct ip_conntrack *ct, int drop_refcount)
+{
+	struct list_head *exp_entry, *next;
+	struct ip_conntrack_expect *exp;
+
+	DEBUGP("remove_expectations(%p)\n", ct);
+
+	list_for_each_safe(exp_entry, next, &ct->sibling_list) {
+		exp = list_entry(exp_entry, struct ip_conntrack_expect,
+				 expected_list);
+
+		/* we skip established expectations, as we want to delete
+		 * the un-established ones only */
+		if (exp->sibling) {
+			DEBUGP("remove_expectations: skipping established %p of %p\n", exp->sibling, ct);
+			if (drop_refcount) {
+				/* Indicate that this expectations parent is dead */
+				ip_conntrack_put(exp->expectant);
+				exp->expectant = NULL;
+			}
+			continue;
+		}
+
+		IP_NF_ASSERT(list_inlist(&ip_conntrack_expect_list, exp));
+		IP_NF_ASSERT(exp->expectant == ct);
+
+		/* delete expectation from global and private lists */
+		unexpect_related(exp);
+	}
+}
+
+static void
+clean_from_lists(struct ip_conntrack *ct)
+{
+	unsigned int ho, hr;
+	
+	DEBUGP("clean_from_lists(%p)\n", ct);
+	MUST_BE_WRITE_LOCKED(&ip_conntrack_lock);
+
+	ho = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+	hr = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+	LIST_DELETE(&ip_conntrack_hash[ho], &ct->tuplehash[IP_CT_DIR_ORIGINAL]);
+	LIST_DELETE(&ip_conntrack_hash[hr], &ct->tuplehash[IP_CT_DIR_REPLY]);
+
+	/* Destroy all un-established, pending expectations */
+	remove_expectations(ct, 1);
+}
+
+static void
+destroy_conntrack(struct nf_conntrack *nfct)
+{
+	struct ip_conntrack *ct = (struct ip_conntrack *)nfct, *master = NULL;
+	struct ip_conntrack_protocol *proto;
+
+	DEBUGP("destroy_conntrack(%p)\n", ct);
+	IP_NF_ASSERT(atomic_read(&nfct->use) == 0);
+	IP_NF_ASSERT(!timer_pending(&ct->timeout));
+
+	/* To make sure we don't get any weird locking issues here:
+	 * destroy_conntrack() MUST NOT be called with a write lock
+	 * to ip_conntrack_lock!!! -HW */
+	proto = ip_ct_find_proto(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
+	if (proto && proto->destroy)
+		proto->destroy(ct);
+
+	if (ip_conntrack_destroyed)
+		ip_conntrack_destroyed(ct);
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* Make sure don't leave any orphaned expectations lying around */
+	if (ct->expecting)
+		remove_expectations(ct, 1);
+
+	/* Delete our master expectation */
+	if (ct->master) {
+		if (ct->master->expectant) {
+			/* can't call __unexpect_related here,
+			 * since it would screw up expect_list */
+			list_del(&ct->master->expected_list);
+			master = ct->master->expectant;
+		}
+		kfree(ct->master);
+	}
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	if (master)
+		ip_conntrack_put(master);
+
+	DEBUGP("destroy_conntrack: returning ct=%p to slab\n", ct);
+	kmem_cache_free(ip_conntrack_cachep, ct);
+	atomic_dec(&ip_conntrack_count);
+}
+
+static void death_by_timeout(unsigned long ul_conntrack)
+{
+	struct ip_conntrack *ct = (void *)ul_conntrack;
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	clean_from_lists(ct);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+	ip_conntrack_put(ct);
+}
+
+static inline int
+conntrack_tuple_cmp(const struct ip_conntrack_tuple_hash *i,
+		    const struct ip_conntrack_tuple *tuple,
+		    const struct ip_conntrack *ignored_conntrack)
+{
+	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+	return i->ctrack != ignored_conntrack
+		&& ip_ct_tuple_equal(tuple, &i->tuple);
+}
+
+static struct ip_conntrack_tuple_hash *
+__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
+		    const struct ip_conntrack *ignored_conntrack)
+{
+	struct ip_conntrack_tuple_hash *h;
+	unsigned int hash = hash_conntrack(tuple);
+
+	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+	h = LIST_FIND(&ip_conntrack_hash[hash],
+		      conntrack_tuple_cmp,
+		      struct ip_conntrack_tuple_hash *,
+		      tuple, ignored_conntrack);
+	return h;
+}
+
+/* Find a connection corresponding to a tuple. */
+struct ip_conntrack_tuple_hash *
+ip_conntrack_find_get(const struct ip_conntrack_tuple *tuple,
+		      const struct ip_conntrack *ignored_conntrack)
+{
+	struct ip_conntrack_tuple_hash *h;
+
+	READ_LOCK(&ip_conntrack_lock);
+	h = __ip_conntrack_find(tuple, ignored_conntrack);
+	if (h)
+		atomic_inc(&h->ctrack->ct_general.use);
+	READ_UNLOCK(&ip_conntrack_lock);
+
+	return h;
+}
+
+static inline struct ip_conntrack *
+__ip_conntrack_get(struct nf_ct_info *nfct, enum ip_conntrack_info *ctinfo)
+{
+	struct ip_conntrack *ct
+		= (struct ip_conntrack *)nfct->master;
+
+	/* ctinfo is the index of the nfct inside the conntrack */
+	*ctinfo = nfct - ct->infos;
+	IP_NF_ASSERT(*ctinfo >= 0 && *ctinfo < IP_CT_NUMBER);
+	return ct;
+}
+
+/* Return conntrack and conntrack_info given skb->nfct->master */
+struct ip_conntrack *
+ip_conntrack_get(struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
+{
+	if (skb->nfct) 
+		return __ip_conntrack_get(skb->nfct, ctinfo);
+	return NULL;
+}
+
+/* Confirm a connection given skb->nfct; places it in hash table */
+int
+__ip_conntrack_confirm(struct nf_ct_info *nfct)
+{
+	unsigned int hash, repl_hash;
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+
+	ct = __ip_conntrack_get(nfct, &ctinfo);
+
+	/* ipt_REJECT uses ip_conntrack_attach to attach related
+	   ICMP/TCP RST packets in other direction.  Actual packet
+	   which created connection will be IP_CT_NEW or for an
+	   expected connection, IP_CT_RELATED. */
+	if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
+		return NF_ACCEPT;
+
+	hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+	repl_hash = hash_conntrack(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+	/* We're not in hash table, and we refuse to set up related
+	   connections for unconfirmed conns.  But packet copies and
+	   REJECT will give spurious warnings here. */
+	/* IP_NF_ASSERT(atomic_read(&ct->ct_general.use) == 1); */
+
+	/* No external references means noone else could have
+           confirmed us. */
+	IP_NF_ASSERT(!is_confirmed(ct));
+	DEBUGP("Confirming conntrack %p\n", ct);
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* See if there's one in the list already, including reverse:
+           NAT could have grabbed it without realizing, since we're
+           not in the hash.  If there is, we lost race. */
+	if (!LIST_FIND(&ip_conntrack_hash[hash],
+		       conntrack_tuple_cmp,
+		       struct ip_conntrack_tuple_hash *,
+		       &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, NULL)
+	    && !LIST_FIND(&ip_conntrack_hash[repl_hash],
+			  conntrack_tuple_cmp,
+			  struct ip_conntrack_tuple_hash *,
+			  &ct->tuplehash[IP_CT_DIR_REPLY].tuple, NULL)) {
+		list_prepend(&ip_conntrack_hash[hash],
+			     &ct->tuplehash[IP_CT_DIR_ORIGINAL]);
+		list_prepend(&ip_conntrack_hash[repl_hash],
+			     &ct->tuplehash[IP_CT_DIR_REPLY]);
+		/* Timer relative to confirmation time, not original
+		   setting time, otherwise we'd get timer wrap in
+		   weird delay cases. */
+		ct->timeout.expires += jiffies;
+		add_timer(&ct->timeout);
+		atomic_inc(&ct->ct_general.use);
+		set_bit(IPS_CONFIRMED_BIT, &ct->status);
+		WRITE_UNLOCK(&ip_conntrack_lock);
+		return NF_ACCEPT;
+	}
+
+	WRITE_UNLOCK(&ip_conntrack_lock);
+	return NF_DROP;
+}
+
+/* Returns true if a connection correspondings to the tuple (required
+   for NAT). */
+int
+ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
+			 const struct ip_conntrack *ignored_conntrack)
+{
+	struct ip_conntrack_tuple_hash *h;
+
+	READ_LOCK(&ip_conntrack_lock);
+	h = __ip_conntrack_find(tuple, ignored_conntrack);
+	READ_UNLOCK(&ip_conntrack_lock);
+
+	return h != NULL;
+}
+
+/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
+struct ip_conntrack *
+icmp_error_track(struct sk_buff *skb,
+		 enum ip_conntrack_info *ctinfo,
+		 unsigned int hooknum)
+{
+	const struct iphdr *iph = skb->nh.iph;
+	struct icmphdr *hdr;
+	struct ip_conntrack_tuple innertuple, origtuple;
+	struct iphdr *inner;
+	size_t datalen;
+	struct ip_conntrack_protocol *innerproto;
+	struct ip_conntrack_tuple_hash *h;
+
+	IP_NF_ASSERT(iph->protocol == IPPROTO_ICMP);
+	IP_NF_ASSERT(skb->nfct == NULL);
+
+	hdr = (struct icmphdr *)((u_int32_t *)iph + iph->ihl);
+	inner = (struct iphdr *)(hdr + 1);
+	datalen = skb->len - iph->ihl*4 - sizeof(*hdr);
+
+	if (skb->len < iph->ihl * 4 + sizeof(*hdr) + sizeof(*iph)) {
+		DEBUGP("icmp_error_track: too short\n");
+		return NULL;
+	}
+
+	if (hdr->type != ICMP_DEST_UNREACH
+	    && hdr->type != ICMP_SOURCE_QUENCH
+	    && hdr->type != ICMP_TIME_EXCEEDED
+	    && hdr->type != ICMP_PARAMETERPROB
+	    && hdr->type != ICMP_REDIRECT)
+		return NULL;
+
+	/* Ignore ICMP's containing fragments (shouldn't happen) */
+	if (inner->frag_off & htons(IP_OFFSET)) {
+		DEBUGP("icmp_error_track: fragment of proto %u\n",
+		       inner->protocol);
+		return NULL;
+	}
+
+	/* Ignore it if the checksum's bogus. */
+	if (ip_compute_csum((unsigned char *)hdr, sizeof(*hdr) + datalen)) {
+		DEBUGP("icmp_error_track: bad csum\n");
+		return NULL;
+	}
+
+	innerproto = ip_ct_find_proto(inner->protocol);
+	/* Are they talking about one of our connections? */
+	if (inner->ihl * 4 + 8 > datalen
+	    || !get_tuple(inner, datalen, &origtuple, innerproto)) {
+		DEBUGP("icmp_error: ! get_tuple p=%u (%u*4+%u dlen=%u)\n",
+		       inner->protocol, inner->ihl, 8,
+		       datalen);
+		return NULL;
+	}
+
+	/* Ordinarily, we'd expect the inverted tupleproto, but it's
+	   been preserved inside the ICMP. */
+	if (!invert_tuple(&innertuple, &origtuple, innerproto)) {
+		DEBUGP("icmp_error_track: Can't invert tuple\n");
+		return NULL;
+	}
+
+	*ctinfo = IP_CT_RELATED;
+
+	h = ip_conntrack_find_get(&innertuple, NULL);
+	if (!h) {
+		/* Locally generated ICMPs will match inverted if they
+		   haven't been SNAT'ed yet */
+		/* FIXME: NAT code has to handle half-done double NAT --RR */
+		if (hooknum == NF_IP_LOCAL_OUT)
+			h = ip_conntrack_find_get(&origtuple, NULL);
+
+		if (!h) {
+			DEBUGP("icmp_error_track: no match\n");
+			return NULL;
+		}
+		/* Reverse direction from that found */
+		if (DIRECTION(h) != IP_CT_DIR_REPLY)
+			*ctinfo += IP_CT_IS_REPLY;
+	} else {
+		if (DIRECTION(h) == IP_CT_DIR_REPLY)
+			*ctinfo += IP_CT_IS_REPLY;
+	}
+
+	/* Update skb to refer to this connection */
+	skb->nfct = &h->ctrack->infos[*ctinfo];
+	return h->ctrack;
+}
+
+/* There's a small race here where we may free a just-assured
+   connection.  Too bad: we're in trouble anyway. */
+static inline int unreplied(const struct ip_conntrack_tuple_hash *i)
+{
+	return !(test_bit(IPS_ASSURED_BIT, &i->ctrack->status));
+}
+
+static int early_drop(struct list_head *chain)
+{
+	/* Traverse backwards: gives us oldest, which is roughly LRU */
+	struct ip_conntrack_tuple_hash *h;
+	int dropped = 0;
+
+	READ_LOCK(&ip_conntrack_lock);
+	h = LIST_FIND_B(chain, unreplied, struct ip_conntrack_tuple_hash *);
+	if (h)
+		atomic_inc(&h->ctrack->ct_general.use);
+	READ_UNLOCK(&ip_conntrack_lock);
+
+	if (!h)
+		return dropped;
+
+	if (del_timer(&h->ctrack->timeout)) {
+		death_by_timeout((unsigned long)h->ctrack);
+		dropped = 1;
+	}
+	ip_conntrack_put(h->ctrack);
+	return dropped;
+}
+
+static inline int helper_cmp(const struct ip_conntrack_helper *i,
+			     const struct ip_conntrack_tuple *rtuple)
+{
+	return ip_ct_tuple_mask_cmp(rtuple, &i->tuple, &i->mask);
+}
+
+struct ip_conntrack_helper *ip_ct_find_helper(const struct ip_conntrack_tuple *tuple)
+{
+	return LIST_FIND(&helpers, helper_cmp,
+			 struct ip_conntrack_helper *,
+			 tuple);
+}
+
+/* Allocate a new conntrack: we return -ENOMEM if classification
+   failed due to stress.  Otherwise it really is unclassifiable. */
+static struct ip_conntrack_tuple_hash *
+init_conntrack(const struct ip_conntrack_tuple *tuple,
+	       struct ip_conntrack_protocol *protocol,
+	       struct sk_buff *skb)
+{
+	struct ip_conntrack *conntrack;
+	struct ip_conntrack_tuple repl_tuple;
+	size_t hash;
+	struct ip_conntrack_expect *expected;
+	int i;
+	static unsigned int drop_next = 0;
+
+	if (!ip_conntrack_hash_rnd_initted) {
+		get_random_bytes(&ip_conntrack_hash_rnd, 4);
+		ip_conntrack_hash_rnd_initted = 1;
+	}
+
+	hash = hash_conntrack(tuple);
+
+	if (ip_conntrack_max &&
+	    atomic_read(&ip_conntrack_count) >= ip_conntrack_max) {
+		/* Try dropping from random chain, or else from the
+                   chain about to put into (in case they're trying to
+                   bomb one hash chain). */
+		unsigned int next = (drop_next++)%ip_conntrack_htable_size;
+
+		if (!early_drop(&ip_conntrack_hash[next])
+		    && !early_drop(&ip_conntrack_hash[hash])) {
+			if (net_ratelimit())
+				printk(KERN_WARNING
+				       "ip_conntrack: table full, dropping"
+				       " packet.\n");
+			return ERR_PTR(-ENOMEM);
+		}
+	}
+
+	if (!invert_tuple(&repl_tuple, tuple, protocol)) {
+		DEBUGP("Can't invert tuple.\n");
+		return NULL;
+	}
+
+	conntrack = kmem_cache_alloc(ip_conntrack_cachep, GFP_ATOMIC);
+	if (!conntrack) {
+		DEBUGP("Can't allocate conntrack.\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	memset(conntrack, 0, sizeof(*conntrack));
+	atomic_set(&conntrack->ct_general.use, 1);
+	conntrack->ct_general.destroy = destroy_conntrack;
+	conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *tuple;
+	conntrack->tuplehash[IP_CT_DIR_ORIGINAL].ctrack = conntrack;
+	conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = repl_tuple;
+	conntrack->tuplehash[IP_CT_DIR_REPLY].ctrack = conntrack;
+	for (i=0; i < IP_CT_NUMBER; i++)
+		conntrack->infos[i].master = &conntrack->ct_general;
+
+	if (!protocol->new(conntrack, skb->nh.iph, skb->len)) {
+		kmem_cache_free(ip_conntrack_cachep, conntrack);
+		return NULL;
+	}
+	/* Don't set timer yet: wait for confirmation */
+	init_timer(&conntrack->timeout);
+	conntrack->timeout.data = (unsigned long)conntrack;
+	conntrack->timeout.function = death_by_timeout;
+
+	INIT_LIST_HEAD(&conntrack->sibling_list);
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* Need finding and deleting of expected ONLY if we win race */
+	READ_LOCK(&ip_conntrack_expect_tuple_lock);
+	expected = LIST_FIND(&ip_conntrack_expect_list, expect_cmp,
+			     struct ip_conntrack_expect *, tuple);
+	READ_UNLOCK(&ip_conntrack_expect_tuple_lock);
+
+	/* If master is not in hash table yet (ie. packet hasn't left
+	   this machine yet), how can other end know about expected?
+	   Hence these are not the droids you are looking for (if
+	   master ct never got confirmed, we'd hold a reference to it
+	   and weird things would happen to future packets). */
+	if (expected && !is_confirmed(expected->expectant))
+		expected = NULL;
+
+	/* Look up the conntrack helper for master connections only */
+	if (!expected)
+		conntrack->helper = ip_ct_find_helper(&repl_tuple);
+
+	/* If the expectation is dying, then this is a looser. */
+	if (expected
+	    && expected->expectant->helper->timeout
+	    && ! del_timer(&expected->timeout))
+		expected = NULL;
+
+	if (expected) {
+		DEBUGP("conntrack: expectation arrives ct=%p exp=%p\n",
+			conntrack, expected);
+		/* Welcome, Mr. Bond.  We've been expecting you... */
+		__set_bit(IPS_EXPECTED_BIT, &conntrack->status);
+		conntrack->master = expected;
+		expected->sibling = conntrack;
+		LIST_DELETE(&ip_conntrack_expect_list, expected);
+		expected->expectant->expecting--;
+		nf_conntrack_get(&master_ct(conntrack)->infos[0]);
+	}
+	atomic_inc(&ip_conntrack_count);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	if (expected && expected->expectfn)
+		expected->expectfn(conntrack);
+	return &conntrack->tuplehash[IP_CT_DIR_ORIGINAL];
+}
+
+/* On success, returns conntrack ptr, sets skb->nfct and ctinfo */
+static inline struct ip_conntrack *
+resolve_normal_ct(struct sk_buff *skb,
+		  struct ip_conntrack_protocol *proto,
+		  int *set_reply,
+		  unsigned int hooknum,
+		  enum ip_conntrack_info *ctinfo)
+{
+	struct ip_conntrack_tuple tuple;
+	struct ip_conntrack_tuple_hash *h;
+
+	IP_NF_ASSERT((skb->nh.iph->frag_off & htons(IP_OFFSET)) == 0);
+
+	if (!get_tuple(skb->nh.iph, skb->len, &tuple, proto))
+		return NULL;
+
+	/* look for tuple match */
+	h = ip_conntrack_find_get(&tuple, NULL);
+	if (!h) {
+		h = init_conntrack(&tuple, proto, skb);
+		if (!h)
+			return NULL;
+		if (IS_ERR(h))
+			return (void *)h;
+	}
+
+	/* It exists; we have (non-exclusive) reference. */
+	if (DIRECTION(h) == IP_CT_DIR_REPLY) {
+		*ctinfo = IP_CT_ESTABLISHED + IP_CT_IS_REPLY;
+		/* Please set reply bit if this packet OK */
+		*set_reply = 1;
+	} else {
+		/* Once we've had two way comms, always ESTABLISHED. */
+		if (test_bit(IPS_SEEN_REPLY_BIT, &h->ctrack->status)) {
+			DEBUGP("ip_conntrack_in: normal packet for %p\n",
+			       h->ctrack);
+		        *ctinfo = IP_CT_ESTABLISHED;
+		} else if (test_bit(IPS_EXPECTED_BIT, &h->ctrack->status)) {
+			DEBUGP("ip_conntrack_in: related packet for %p\n",
+			       h->ctrack);
+			*ctinfo = IP_CT_RELATED;
+		} else {
+			DEBUGP("ip_conntrack_in: new packet for %p\n",
+			       h->ctrack);
+			*ctinfo = IP_CT_NEW;
+		}
+		*set_reply = 0;
+	}
+	skb->nfct = &h->ctrack->infos[*ctinfo];
+	return h->ctrack;
+}
+
+/* Netfilter hook itself. */
+unsigned int ip_conntrack_in(unsigned int hooknum,
+			     struct sk_buff **pskb,
+			     const struct net_device *in,
+			     const struct net_device *out,
+			     int (*okfn)(struct sk_buff *))
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+	struct ip_conntrack_protocol *proto;
+	int set_reply;
+	int ret;
+
+	/* FIXME: Do this right please. --RR */
+	(*pskb)->nfcache |= NFC_UNKNOWN;
+
+/* Doesn't cover locally-generated broadcast, so not worth it. */
+#if 0
+	/* Ignore broadcast: no `connection'. */
+	if ((*pskb)->pkt_type == PACKET_BROADCAST) {
+		printk("Broadcast packet!\n");
+		return NF_ACCEPT;
+	} else if (((*pskb)->nh.iph->daddr & htonl(0x000000FF)) 
+		   == htonl(0x000000FF)) {
+		printk("Should bcast: %u.%u.%u.%u->%u.%u.%u.%u (sk=%p, ptype=%u)\n",
+		       NIPQUAD((*pskb)->nh.iph->saddr),
+		       NIPQUAD((*pskb)->nh.iph->daddr),
+		       (*pskb)->sk, (*pskb)->pkt_type);
+	}
+#endif
+
+	/* Previously seen (loopback)?  Ignore.  Do this before
+           fragment check. */
+	if ((*pskb)->nfct)
+		return NF_ACCEPT;
+
+	/* Gather fragments. */
+	if ((*pskb)->nh.iph->frag_off & htons(IP_MF|IP_OFFSET)) {
+		*pskb = ip_ct_gather_frags(*pskb);
+		if (!*pskb)
+			return NF_STOLEN;
+	}
+
+	proto = ip_ct_find_proto((*pskb)->nh.iph->protocol);
+
+	/* It may be an icmp error... */
+	if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP 
+	    && icmp_error_track(*pskb, &ctinfo, hooknum))
+		return NF_ACCEPT;
+
+	if (!(ct = resolve_normal_ct(*pskb, proto,&set_reply,hooknum,&ctinfo)))
+		/* Not valid part of a connection */
+		return NF_ACCEPT;
+
+	if (IS_ERR(ct))
+		/* Too stressed to deal. */
+		return NF_DROP;
+
+	IP_NF_ASSERT((*pskb)->nfct);
+
+	ret = proto->packet(ct, (*pskb)->nh.iph, (*pskb)->len, ctinfo);
+	if (ret == -1) {
+		/* Invalid */
+		nf_conntrack_put((*pskb)->nfct);
+		(*pskb)->nfct = NULL;
+		return NF_ACCEPT;
+	}
+
+	if (ret != NF_DROP && ct->helper) {
+		ret = ct->helper->help((*pskb)->nh.iph, (*pskb)->len,
+				       ct, ctinfo);
+		if (ret == -1) {
+			/* Invalid */
+			nf_conntrack_put((*pskb)->nfct);
+			(*pskb)->nfct = NULL;
+			return NF_ACCEPT;
+		}
+	}
+	if (set_reply)
+		set_bit(IPS_SEEN_REPLY_BIT, &ct->status);
+
+	return ret;
+}
+
+int invert_tuplepr(struct ip_conntrack_tuple *inverse,
+		   const struct ip_conntrack_tuple *orig)
+{
+	return invert_tuple(inverse, orig, ip_ct_find_proto(orig->dst.protonum));
+}
+
+static inline int resent_expect(const struct ip_conntrack_expect *i,
+			        const struct ip_conntrack_tuple *tuple,
+			        const struct ip_conntrack_tuple *mask)
+{
+	DEBUGP("resent_expect\n");
+	DEBUGP("   tuple:   "); DUMP_TUPLE(&i->tuple);
+	DEBUGP("ct_tuple:   "); DUMP_TUPLE(&i->ct_tuple);
+	DEBUGP("test tuple: "); DUMP_TUPLE(tuple);
+	return (((i->ct_tuple.dst.protonum == 0 && ip_ct_tuple_equal(&i->tuple, tuple))
+	         || (i->ct_tuple.dst.protonum && ip_ct_tuple_equal(&i->ct_tuple, tuple)))
+		&& ip_ct_tuple_equal(&i->mask, mask));
+}
+
+/* Would two expected things clash? */
+static inline int expect_clash(const struct ip_conntrack_expect *i,
+			       const struct ip_conntrack_tuple *tuple,
+			       const struct ip_conntrack_tuple *mask)
+{
+	/* Part covered by intersection of masks must be unequal,
+           otherwise they clash */
+	struct ip_conntrack_tuple intersect_mask
+		= { { i->mask.src.ip & mask->src.ip,
+		      { i->mask.src.u.all & mask->src.u.all } },
+		    { i->mask.dst.ip & mask->dst.ip,
+		      { i->mask.dst.u.all & mask->dst.u.all },
+		      i->mask.dst.protonum & mask->dst.protonum } };
+
+	return ip_ct_tuple_mask_cmp(&i->tuple, tuple, &intersect_mask);
+}
+
+inline void ip_conntrack_unexpect_related(struct ip_conntrack_expect *expect)
+{
+	WRITE_LOCK(&ip_conntrack_lock);
+	unexpect_related(expect);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+}
+	
+static void expectation_timed_out(unsigned long ul_expect)
+{
+	struct ip_conntrack_expect *expect = (void *) ul_expect;
+
+	DEBUGP("expectation %p timed out\n", expect);	
+	WRITE_LOCK(&ip_conntrack_lock);
+	__unexpect_related(expect);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+}
+
+/* Add a related connection. */
+int ip_conntrack_expect_related(struct ip_conntrack *related_to,
+				struct ip_conntrack_expect *expect)
+{
+	struct ip_conntrack_expect *old, *new;
+	int ret = 0;
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* Because of the write lock, no reader can walk the lists,
+	 * so there is no need to use the tuple lock too */
+
+	DEBUGP("ip_conntrack_expect_related %p\n", related_to);
+	DEBUGP("tuple: "); DUMP_TUPLE(&expect->tuple);
+	DEBUGP("mask:  "); DUMP_TUPLE(&expect->mask);
+
+	old = LIST_FIND(&ip_conntrack_expect_list, resent_expect,
+		        struct ip_conntrack_expect *, &expect->tuple, 
+			&expect->mask);
+	if (old) {
+		/* Helper private data may contain offsets but no pointers
+		   pointing into the payload - otherwise we should have to copy 
+		   the data filled out by the helper over the old one */
+		DEBUGP("expect_related: resent packet\n");
+		if (related_to->helper->timeout) {
+			if (!del_timer(&old->timeout)) {
+				/* expectation is dying. Fall through */
+				old = NULL;
+			} else {
+				old->timeout.expires = jiffies + 
+					related_to->helper->timeout * HZ;
+				add_timer(&old->timeout);
+			}
+		}
+
+		if (old) {
+			WRITE_UNLOCK(&ip_conntrack_lock);
+			return -EEXIST;
+		}
+	} else if (related_to->helper->max_expected && 
+		   related_to->expecting >= related_to->helper->max_expected) {
+		/* old == NULL */
+		if (!(related_to->helper->flags & 
+		      IP_CT_HELPER_F_REUSE_EXPECT)) {
+			WRITE_UNLOCK(&ip_conntrack_lock);
+ 		    	if (net_ratelimit())
+ 			    	printk(KERN_WARNING
+				       "ip_conntrack: max number of expected "
+				       "connections %i of %s reached for "
+				       "%u.%u.%u.%u->%u.%u.%u.%u\n",
+				       related_to->helper->max_expected,
+				       related_to->helper->name,
+ 		    	       	       NIPQUAD(related_to->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip),
+ 		    	       	       NIPQUAD(related_to->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip));
+			return -EPERM;
+		}
+		DEBUGP("ip_conntrack: max number of expected "
+		       "connections %i of %s reached for "
+		       "%u.%u.%u.%u->%u.%u.%u.%u, reusing\n",
+ 		       related_to->helper->max_expected,
+		       related_to->helper->name,
+		       NIPQUAD(related_to->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip),
+		       NIPQUAD(related_to->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip));
+ 
+		/* choose the the oldest expectation to evict */
+		list_for_each_entry(old, &related_to->sibling_list, 
+		                                      expected_list)
+			if (old->sibling == NULL)
+				break;
+
+		/* We cannot fail since related_to->expecting is the number
+		 * of unconfirmed expectations */
+		IP_NF_ASSERT(old && old->sibling == NULL);
+
+		/* newnat14 does not reuse the real allocated memory
+		 * structures but rather unexpects the old and
+		 * allocates a new.  unexpect_related will decrement
+		 * related_to->expecting. 
+		 */
+		unexpect_related(old);
+		ret = -EPERM;
+	} else if (LIST_FIND(&ip_conntrack_expect_list, expect_clash,
+			     struct ip_conntrack_expect *, &expect->tuple, 
+			     &expect->mask)) {
+		WRITE_UNLOCK(&ip_conntrack_lock);
+		DEBUGP("expect_related: busy!\n");
+		return -EBUSY;
+	}
+	
+	new = (struct ip_conntrack_expect *) 
+	      kmalloc(sizeof(struct ip_conntrack_expect), GFP_ATOMIC);
+	if (!new) {
+		WRITE_UNLOCK(&ip_conntrack_lock);
+		DEBUGP("expect_relaed: OOM allocating expect\n");
+		return -ENOMEM;
+	}
+	
+	DEBUGP("new expectation %p of conntrack %p\n", new, related_to);
+	memcpy(new, expect, sizeof(*expect));
+	new->expectant = related_to;
+	new->sibling = NULL;
+	atomic_set(&new->use, 1);
+	
+	/* add to expected list for this connection */	
+	list_add_tail(&new->expected_list, &related_to->sibling_list);
+	/* add to global list of expectations */
+	list_prepend(&ip_conntrack_expect_list, &new->list);
+	/* add and start timer if required */
+	if (related_to->helper->timeout) {
+		init_timer(&new->timeout);
+		new->timeout.data = (unsigned long)new;
+		new->timeout.function = expectation_timed_out;
+		new->timeout.expires = jiffies + 
+					related_to->helper->timeout * HZ;
+		add_timer(&new->timeout);
+	}
+	related_to->expecting++;
+
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	return ret;
+}
+
+/* Change tuple in an existing expectation */
+int ip_conntrack_change_expect(struct ip_conntrack_expect *expect,
+			       struct ip_conntrack_tuple *newtuple)
+{
+	int ret;
+
+	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+	WRITE_LOCK(&ip_conntrack_expect_tuple_lock);
+
+	DEBUGP("change_expect:\n");
+	DEBUGP("exp tuple: "); DUMP_TUPLE(&expect->tuple);
+	DEBUGP("exp mask:  "); DUMP_TUPLE(&expect->mask);
+	DEBUGP("newtuple:  "); DUMP_TUPLE(newtuple);
+	if (expect->ct_tuple.dst.protonum == 0) {
+		/* Never seen before */
+		DEBUGP("change expect: never seen before\n");
+		if (!ip_ct_tuple_equal(&expect->tuple, newtuple) 
+		    && LIST_FIND(&ip_conntrack_expect_list, expect_clash,
+			         struct ip_conntrack_expect *, newtuple, &expect->mask)) {
+			/* Force NAT to find an unused tuple */
+			ret = -1;
+		} else {
+			memcpy(&expect->ct_tuple, &expect->tuple, sizeof(expect->tuple));
+			memcpy(&expect->tuple, newtuple, sizeof(expect->tuple));
+			ret = 0;
+		}
+	} else {
+		/* Resent packet */
+		DEBUGP("change expect: resent packet\n");
+		if (ip_ct_tuple_equal(&expect->tuple, newtuple)) {
+			ret = 0;
+		} else {
+			/* Force NAT to choose again the same port */
+			ret = -1;
+		}
+	}
+	WRITE_UNLOCK(&ip_conntrack_expect_tuple_lock);
+	
+	return ret;
+}
+
+/* Alter reply tuple (maybe alter helper).  If it's already taken,
+   return 0 and don't do alteration. */
+int ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
+			     const struct ip_conntrack_tuple *newreply)
+{
+	WRITE_LOCK(&ip_conntrack_lock);
+	if (__ip_conntrack_find(newreply, conntrack)) {
+		WRITE_UNLOCK(&ip_conntrack_lock);
+		return 0;
+	}
+	/* Should be unconfirmed, so not in hash table yet */
+	IP_NF_ASSERT(!is_confirmed(conntrack));
+
+	DEBUGP("Altering reply tuple of %p to ", conntrack);
+	DUMP_TUPLE(newreply);
+
+	conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
+	if (!conntrack->master && list_empty(&conntrack->sibling_list))
+		conntrack->helper = ip_ct_find_helper(newreply);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	return 1;
+}
+
+int ip_conntrack_helper_register(struct ip_conntrack_helper *me)
+{
+	MOD_INC_USE_COUNT;
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	list_prepend(&helpers, me);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	return 0;
+}
+
+static inline int unhelp(struct ip_conntrack_tuple_hash *i,
+			 const struct ip_conntrack_helper *me)
+{
+	if (i->ctrack->helper == me) {
+		/* Get rid of any expected. */
+		remove_expectations(i->ctrack, 0);
+		/* And *then* set helper to NULL */
+		i->ctrack->helper = NULL;
+	}
+	return 0;
+}
+
+void ip_conntrack_helper_unregister(struct ip_conntrack_helper *me)
+{
+	unsigned int i;
+
+	/* Need write lock here, to delete helper. */
+	WRITE_LOCK(&ip_conntrack_lock);
+	LIST_DELETE(&helpers, me);
+
+	/* Get rid of expecteds, set helpers to NULL. */
+	for (i = 0; i < ip_conntrack_htable_size; i++)
+		LIST_FIND_W(&ip_conntrack_hash[i], unhelp,
+			    struct ip_conntrack_tuple_hash *, me);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	/* Someone could be still looking at the helper in a bh. */
+	br_write_lock_bh(BR_NETPROTO_LOCK);
+	br_write_unlock_bh(BR_NETPROTO_LOCK);
+
+	MOD_DEC_USE_COUNT;
+}
+
+/* Refresh conntrack for this many jiffies. */
+void ip_ct_refresh(struct ip_conntrack *ct, unsigned long extra_jiffies)
+{
+	IP_NF_ASSERT(ct->timeout.data == (unsigned long)ct);
+
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* If not in hash table, timer will not be active yet */
+	if (!is_confirmed(ct))
+		ct->timeout.expires = extra_jiffies;
+	else {
+		/* Need del_timer for race avoidance (may already be dying). */
+		if (del_timer(&ct->timeout)) {
+			ct->timeout.expires = jiffies + extra_jiffies;
+			add_timer(&ct->timeout);
+		}
+	}
+	WRITE_UNLOCK(&ip_conntrack_lock);
+}
+
+/* Returns new sk_buff, or NULL */
+struct sk_buff *
+ip_ct_gather_frags(struct sk_buff *skb)
+{
+	struct sock *sk = skb->sk;
+#ifdef CONFIG_NETFILTER_DEBUG
+	unsigned int olddebug = skb->nf_debug;
+#endif
+	if (sk) {
+		sock_hold(sk);
+		skb_orphan(skb);
+	}
+
+	local_bh_disable(); 
+	skb = ip_defrag(skb);
+	local_bh_enable();
+
+	if (!skb) {
+		if (sk) sock_put(sk);
+		return skb;
+	} else if (skb_is_nonlinear(skb) && skb_linearize(skb, GFP_ATOMIC) != 0) {
+		kfree_skb(skb);
+		if (sk) sock_put(sk);
+		return NULL;
+	}
+
+	if (sk) {
+		skb_set_owner_w(skb, sk);
+		sock_put(sk);
+	}
+
+	ip_send_check(skb->nh.iph);
+	skb->nfcache |= NFC_ALTERED;
+#ifdef CONFIG_NETFILTER_DEBUG
+	/* Packet path as if nothing had happened. */
+	skb->nf_debug = olddebug;
+#endif
+	return skb;
+}
+
+/* Used by ipt_REJECT. */
+static void ip_conntrack_attach(struct sk_buff *nskb, struct nf_ct_info *nfct)
+{
+	struct ip_conntrack *ct;
+	enum ip_conntrack_info ctinfo;
+
+	ct = __ip_conntrack_get(nfct, &ctinfo);
+
+	/* This ICMP is in reverse direction to the packet which
+           caused it */
+	if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL)
+		ctinfo = IP_CT_RELATED + IP_CT_IS_REPLY;
+	else
+		ctinfo = IP_CT_RELATED;
+
+	/* Attach new skbuff, and increment count */
+	nskb->nfct = &ct->infos[ctinfo];
+	atomic_inc(&ct->ct_general.use);
+}
+
+static inline int
+do_kill(const struct ip_conntrack_tuple_hash *i,
+	int (*kill)(const struct ip_conntrack *i, void *data),
+	void *data)
+{
+	return kill(i->ctrack, data);
+}
+
+/* Bring out ya dead! */
+static struct ip_conntrack_tuple_hash *
+get_next_corpse(int (*kill)(const struct ip_conntrack *i, void *data),
+		void *data, unsigned int *bucket)
+{
+	struct ip_conntrack_tuple_hash *h = NULL;
+
+	READ_LOCK(&ip_conntrack_lock);
+	for (; !h && *bucket < ip_conntrack_htable_size; (*bucket)++) {
+		h = LIST_FIND(&ip_conntrack_hash[*bucket], do_kill,
+			      struct ip_conntrack_tuple_hash *, kill, data);
+	}
+	if (h)
+		atomic_inc(&h->ctrack->ct_general.use);
+	READ_UNLOCK(&ip_conntrack_lock);
+
+	return h;
+}
+
+void
+ip_ct_selective_cleanup(int (*kill)(const struct ip_conntrack *i, void *data),
+			void *data)
+{
+	struct ip_conntrack_tuple_hash *h;
+	unsigned int bucket = 0;
+
+	while ((h = get_next_corpse(kill, data, &bucket)) != NULL) {
+		/* Time to push up daises... */
+		if (del_timer(&h->ctrack->timeout))
+			death_by_timeout((unsigned long)h->ctrack);
+		/* ... else the timer will get him soon. */
+
+		ip_conntrack_put(h->ctrack);
+	}
+}
+
+/* Fast function for those who don't want to parse /proc (and I don't
+   blame them). */
+/* Reversing the socket's dst/src point of view gives us the reply
+   mapping. */
+static int
+getorigdst(struct sock *sk, int optval, void *user, int *len)
+{
+	struct ip_conntrack_tuple_hash *h;
+	struct ip_conntrack_tuple tuple;
+
+	IP_CT_TUPLE_U_BLANK(&tuple);
+	tuple.src.ip = sk->rcv_saddr;
+	tuple.src.u.tcp.port = sk->sport;
+	tuple.dst.ip = sk->daddr;
+	tuple.dst.u.tcp.port = sk->dport;
+	tuple.dst.protonum = IPPROTO_TCP;
+
+	/* We only do TCP at the moment: is there a better way? */
+	if (strcmp(sk->prot->name, "TCP") != 0) {
+		DEBUGP("SO_ORIGINAL_DST: Not a TCP socket\n");
+		return -ENOPROTOOPT;
+	}
+
+	if ((unsigned int) *len < sizeof(struct sockaddr_in)) {
+		DEBUGP("SO_ORIGINAL_DST: len %u not %u\n",
+		       *len, sizeof(struct sockaddr_in));
+		return -EINVAL;
+	}
+
+	h = ip_conntrack_find_get(&tuple, NULL);
+	if (h) {
+		struct sockaddr_in sin;
+
+		sin.sin_family = AF_INET;
+		sin.sin_port = h->ctrack->tuplehash[IP_CT_DIR_ORIGINAL]
+			.tuple.dst.u.tcp.port;
+		sin.sin_addr.s_addr = h->ctrack->tuplehash[IP_CT_DIR_ORIGINAL]
+			.tuple.dst.ip;
+
+		DEBUGP("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n",
+		       NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
+		ip_conntrack_put(h->ctrack);
+		if (copy_to_user(user, &sin, sizeof(sin)) != 0)
+			return -EFAULT;
+		else
+			return 0;
+	}
+	DEBUGP("SO_ORIGINAL_DST: Can't find %u.%u.%u.%u/%u-%u.%u.%u.%u/%u.\n",
+	       NIPQUAD(tuple.src.ip), ntohs(tuple.src.u.tcp.port),
+	       NIPQUAD(tuple.dst.ip), ntohs(tuple.dst.u.tcp.port));
+	return -ENOENT;
+}
+
+static struct nf_sockopt_ops so_getorigdst
+= { { NULL, NULL }, PF_INET,
+    0, 0, NULL, /* Setsockopts */
+    SO_ORIGINAL_DST, SO_ORIGINAL_DST+1, &getorigdst,
+    0, NULL };
+
+static int kill_all(const struct ip_conntrack *i, void *data)
+{
+	return 1;
+}
+
+/* Mishearing the voices in his head, our hero wonders how he's
+   supposed to kill the mall. */
+void ip_conntrack_cleanup(void)
+{
+	ip_ct_attach = NULL;
+	/* This makes sure all current packets have passed through
+           netfilter framework.  Roll on, two-stage module
+           delete... */
+	br_write_lock_bh(BR_NETPROTO_LOCK);
+	br_write_unlock_bh(BR_NETPROTO_LOCK);
+ 
+ i_see_dead_people:
+	ip_ct_selective_cleanup(kill_all, NULL);
+	if (atomic_read(&ip_conntrack_count) != 0) {
+		schedule();
+		goto i_see_dead_people;
+	}
+
+	kmem_cache_destroy(ip_conntrack_cachep);
+	vfree(ip_conntrack_hash);
+	nf_unregister_sockopt(&so_getorigdst);
+}
+
+static int hashsize = 0;
+MODULE_PARM(hashsize, "i");
+
+int __init ip_conntrack_init(void)
+{
+	unsigned int i;
+	int ret;
+
+	/* Idea from tcp.c: use 1/16384 of memory.  On i386: 32MB
+	 * machine has 256 buckets.  >= 1GB machines have 8192 buckets. */
+ 	if (hashsize) {
+ 		ip_conntrack_htable_size = hashsize;
+ 	} else {
+		ip_conntrack_htable_size
+			= (((num_physpages << PAGE_SHIFT) / 16384)
+			   / sizeof(struct list_head));
+		if (num_physpages > (1024 * 1024 * 1024 / PAGE_SIZE))
+			ip_conntrack_htable_size = 8192;
+		if (ip_conntrack_htable_size < 16)
+			ip_conntrack_htable_size = 16;
+	}
+	ip_conntrack_max = 8 * ip_conntrack_htable_size;
+
+	printk("ip_conntrack version %s (%u buckets, %d max)"
+	       " - %Zd bytes per conntrack\n", IP_CONNTRACK_VERSION,
+	       ip_conntrack_htable_size, ip_conntrack_max,
+	       sizeof(struct ip_conntrack));
+
+	ret = nf_register_sockopt(&so_getorigdst);
+	if (ret != 0) {
+		printk(KERN_ERR "Unable to register netfilter socket option\n");
+		return ret;
+	}
+
+	ip_conntrack_hash = vmalloc(sizeof(struct list_head)
+				    * ip_conntrack_htable_size);
+	if (!ip_conntrack_hash) {
+		printk(KERN_ERR "Unable to create ip_conntrack_hash\n");
+		goto err_unreg_sockopt;
+	}
+
+	ip_conntrack_cachep = kmem_cache_create("ip_conntrack",
+	                                        sizeof(struct ip_conntrack), 0,
+	                                        SLAB_HWCACHE_ALIGN, NULL, NULL);
+	if (!ip_conntrack_cachep) {
+		printk(KERN_ERR "Unable to create ip_conntrack slab cache\n");
+		goto err_free_hash;
+	}
+	/* Don't NEED lock here, but good form anyway. */
+	WRITE_LOCK(&ip_conntrack_lock);
+	/* Sew in builtin protocols. */
+	list_append(&protocol_list, &ip_conntrack_protocol_tcp);
+	list_append(&protocol_list, &ip_conntrack_protocol_udp);
+	list_append(&protocol_list, &ip_conntrack_protocol_icmp);
+	WRITE_UNLOCK(&ip_conntrack_lock);
+
+	for (i = 0; i < ip_conntrack_htable_size; i++)
+		INIT_LIST_HEAD(&ip_conntrack_hash[i]);
+
+	/* For use by ipt_REJECT */
+	ip_ct_attach = ip_conntrack_attach;
+	return ret;
+
+err_free_hash:
+	vfree(ip_conntrack_hash);
+err_unreg_sockopt:
+	nf_unregister_sockopt(&so_getorigdst);
+
+	return -ENOMEM;
+}
diff -uNr linux_org/net/ipv4/netfilter/ip_conntrack_pptp.c linux/net/ipv4/netfilter/ip_conntrack_pptp.c
--- linux_org/net/ipv4/netfilter/ip_conntrack_pptp.c	1970-01-01 01:00:00.000000000 +0100
+++ linux/net/ipv4/netfilter/ip_conntrack_pptp.c	2006-10-27 14:11:52.000000000 +0200
@@ -0,0 +1,637 @@
+/*
+ * ip_conntrack_pptp.c	- Version 1.9
+ *
+ * Connection tracking support for PPTP (Point to Point Tunneling Protocol).
+ * PPTP is a a protocol for creating virtual private networks.
+ * It is a specification defined by Microsoft and some vendors
+ * working with Microsoft.  PPTP is built on top of a modified
+ * version of the Internet Generic Routing Encapsulation Protocol.
+ * GRE is defined in RFC 1701 and RFC 1702.  Documentation of
+ * PPTP can be found in RFC 2637
+ *
+ * (C) 2000-2003 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ *
+ * Limitations:
+ * 	 - We blindly assume that control connections are always
+ * 	   established in PNS->PAC direction.  This is a violation
+ * 	   of RFFC2673
+ *
+ * TODO: - finish support for multiple calls within one session
+ * 	   (needs expect reservations in newnat)
+ *	 - testing of incoming PPTP calls 
+ *
+ * Changes: 
+ * 	2002-02-05 - Version 1.3
+ * 	  - Call ip_conntrack_unexpect_related() from 
+ * 	    pptp_timeout_related() to destroy expectations in case
+ * 	    CALL_DISCONNECT_NOTIFY or tcp fin packet was seen
+ * 	    (Philip Craig <philipc@snapgear.com>)
+ * 	  - Add Version information at module loadtime
+ * 	2002-02-10 - Version 1.6
+ * 	  - move to C99 style initializers
+ * 	  - remove second expectation if first arrives
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <net/checksum.h>
+#include <net/tcp.h>
+
+#include <linux/netfilter_ipv4/lockhelp.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
+#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
+
+#define IP_CT_PPTP_VERSION "1.9"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("Netfilter connection tracking helper module for PPTP");
+
+DECLARE_LOCK(ip_pptp_lock);
+
+#if 0
+#include "ip_conntrack_pptp_priv.h"
+#define DEBUGP(format, args...)	printk(KERN_DEBUG __FILE__ ":" __FUNCTION__ \
+					": " format, ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+#define SECS *HZ
+#define MINS * 60 SECS
+#define HOURS * 60 MINS
+#define DAYS * 24 HOURS
+
+#define PPTP_GRE_TIMEOUT 		(10 MINS)
+#define PPTP_GRE_STREAM_TIMEOUT 	(5 DAYS)
+
+static int pptp_expectfn(struct ip_conntrack *ct)
+{
+	struct ip_conntrack *master;
+	struct ip_conntrack_expect *exp;
+
+	DEBUGP("increasing timeouts\n");
+	/* increase timeout of GRE data channel conntrack entry */
+	ct->proto.gre.timeout = PPTP_GRE_TIMEOUT;
+	ct->proto.gre.stream_timeout = PPTP_GRE_STREAM_TIMEOUT;
+
+	master = master_ct(ct);
+	if (!master) {
+		DEBUGP(" no master!!!\n");
+		return 0;
+	}
+
+	exp = ct->master;
+	if (!exp) {
+		DEBUGP("no expectation!!\n");
+		return 0;
+	}
+
+	DEBUGP("completing tuples with ct info\n");
+	/* we can do this, since we're unconfirmed */
+	if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u.gre.key == 
+		htonl(master->help.ct_pptp_info.pac_call_id)) {	
+		/* assume PNS->PAC */
+		ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.gre.key = 
+			htonl(master->help.ct_pptp_info.pns_call_id);
+		ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.gre.key =
+			htonl(master->help.ct_pptp_info.pns_call_id);
+	} else {
+		/* assume PAC->PNS */
+		ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.gre.key =
+			htonl(master->help.ct_pptp_info.pac_call_id);
+		ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.gre.key =
+			htonl(master->help.ct_pptp_info.pac_call_id);
+	}
+	
+	/* delete other expectation */
+	if (exp->expected_list.next != &exp->expected_list) {
+		struct ip_conntrack_expect *other_exp;
+		struct list_head *cur_item, *next;
+
+		for (cur_item = master->sibling_list.next;
+		     cur_item != &master->sibling_list; cur_item = next) {
+			next = cur_item->next;
+			other_exp = list_entry(cur_item,
+					       struct ip_conntrack_expect,
+					       expected_list);
+			/* remove only if occurred at same sequence number */
+			if (other_exp != exp && other_exp->seq == exp->seq) {
+				DEBUGP("unexpecting other direction\n");
+				ip_ct_gre_keymap_destroy(other_exp);
+				ip_conntrack_unexpect_related(other_exp);
+			}
+		}
+	}
+
+	return 0;
+}
+
+/* timeout GRE data connections */
+static int pptp_timeout_related(struct ip_conntrack *ct)
+{
+	struct list_head *cur_item, *next;
+	struct ip_conntrack_expect *exp;
+
+	/* FIXME: do we have to lock something ? */
+	for (cur_item = ct->sibling_list.next;
+	    cur_item != &ct->sibling_list; cur_item = next) {
+		next = cur_item->next;
+		exp = list_entry(cur_item, struct ip_conntrack_expect,
+				 expected_list);
+
+		ip_ct_gre_keymap_destroy(exp);
+		if (!exp->sibling) {
+			ip_conntrack_unexpect_related(exp);
+			continue;
+		}
+
+		DEBUGP("setting timeout of conntrack %p to 0\n",
+			exp->sibling);
+		exp->sibling->proto.gre.timeout = 0;
+		exp->sibling->proto.gre.stream_timeout = 0;
+		ip_ct_refresh(exp->sibling, 0);
+	}
+
+	return 0;
+}
+
+/* expect GRE connections (PNS->PAC and PAC->PNS direction) */
+static inline int
+exp_gre(struct ip_conntrack *master,
+	u_int32_t seq,
+	u_int16_t callid,
+	u_int16_t peer_callid)
+{
+	struct ip_conntrack_expect exp;
+	struct ip_conntrack_tuple inv_tuple;
+
+	memset(&exp, 0, sizeof(exp));
+	/* tuple in original direction, PNS->PAC */
+	exp.tuple.src.ip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
+	exp.tuple.src.u.gre.key = htonl(ntohs(peer_callid));
+	exp.tuple.dst.ip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip;
+	exp.tuple.dst.u.gre.key = htonl(ntohs(callid));
+	exp.tuple.dst.u.gre.protocol = __constant_htons(GRE_PROTOCOL_PPTP);
+	exp.tuple.dst.u.gre.version = GRE_VERSION_PPTP;
+	exp.tuple.dst.protonum = IPPROTO_GRE;
+
+	exp.mask.src.ip = 0xffffffff;
+	exp.mask.src.u.all = 0;
+	exp.mask.dst.u.all = 0;
+	exp.mask.dst.u.gre.key = 0xffffffff;
+	exp.mask.dst.u.gre.version = 0xff;
+	exp.mask.dst.u.gre.protocol = 0xffff;
+	exp.mask.dst.ip = 0xffffffff;
+	exp.mask.dst.protonum = 0xffff;
+			
+	exp.seq = seq;
+	exp.expectfn = pptp_expectfn;
+
+	exp.help.exp_pptp_info.pac_call_id = ntohs(callid);
+	exp.help.exp_pptp_info.pns_call_id = ntohs(peer_callid);
+
+	DEBUGP("calling expect_related ");
+	DUMP_TUPLE_RAW(&exp.tuple);
+	
+	/* Add GRE keymap entries */
+	if (ip_ct_gre_keymap_add(&exp, &exp.tuple, 0) != 0)
+		return 1;
+
+	invert_tuplepr(&inv_tuple, &exp.tuple);
+	if (ip_ct_gre_keymap_add(&exp, &inv_tuple, 1) != 0) {
+		ip_ct_gre_keymap_destroy(&exp);
+		return 1;
+	}
+	
+	if (ip_conntrack_expect_related(master, &exp) != 0) {
+		ip_ct_gre_keymap_destroy(&exp);
+		DEBUGP("cannot expect_related()\n");
+		return 1;
+	}
+
+	/* tuple in reply direction, PAC->PNS */
+	exp.tuple.src.ip = master->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip;
+	exp.tuple.src.u.gre.key = htonl(ntohs(callid));
+	exp.tuple.dst.ip = master->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
+	exp.tuple.dst.u.gre.key = htonl(ntohs(peer_callid));
+
+	DEBUGP("calling expect_related ");
+	DUMP_TUPLE_RAW(&exp.tuple);
+	
+	/* Add GRE keymap entries */
+	ip_ct_gre_keymap_add(&exp, &exp.tuple, 0);
+	invert_tuplepr(&inv_tuple, &exp.tuple);
+	ip_ct_gre_keymap_add(&exp, &inv_tuple, 1);
+	/* FIXME: cannot handle error correctly, since we need to free
+	 * the above keymap :( */
+	
+	if (ip_conntrack_expect_related(master, &exp) != 0) {
+		/* free the second pair of keypmaps */
+		ip_ct_gre_keymap_destroy(&exp);
+		DEBUGP("cannot expect_related():\n");
+		return 1;
+	}
+
+	return 0;
+}
+
+static inline int 
+pptp_inbound_pkt(struct tcphdr *tcph,
+		 struct pptp_pkt_hdr *pptph, 
+		 size_t datalen,
+		 struct ip_conntrack *ct,
+		 enum ip_conntrack_info ctinfo)
+{
+	struct PptpControlHeader *ctlh;
+        union pptp_ctrl_union pptpReq;
+	
+	struct ip_ct_pptp_master *info = &ct->help.ct_pptp_info;
+	u_int16_t msg, *cid, *pcid;
+	u_int32_t seq;	
+
+	ctlh = (struct PptpControlHeader *) 
+		((char *) pptph + sizeof(struct pptp_pkt_hdr));
+	pptpReq.rawreq = (void *) 
+		((char *) ctlh + sizeof(struct PptpControlHeader));
+
+	msg = ntohs(ctlh->messageType);
+	DEBUGP("inbound control message %s\n", strMName[msg]);
+
+	switch (msg) {
+	case PPTP_START_SESSION_REPLY:
+		/* server confirms new control session */
+		if (info->sstate < PPTP_SESSION_REQUESTED) {
+			DEBUGP("%s without START_SESS_REQUEST\n",
+				strMName[msg]);
+			break;
+		}
+		if (pptpReq.srep->resultCode == PPTP_START_OK)
+			info->sstate = PPTP_SESSION_CONFIRMED;
+		else 
+			info->sstate = PPTP_SESSION_ERROR;
+		break;
+
+	case PPTP_STOP_SESSION_REPLY:
+		/* server confirms end of control session */
+		if (info->sstate > PPTP_SESSION_STOPREQ) {
+			DEBUGP("%s without STOP_SESS_REQUEST\n",
+				strMName[msg]);
+			break;
+		}
+		if (pptpReq.strep->resultCode == PPTP_STOP_OK)
+			info->sstate = PPTP_SESSION_NONE;
+		else
+			info->sstate = PPTP_SESSION_ERROR;
+		break;
+
+	case PPTP_OUT_CALL_REPLY:
+		/* server accepted call, we now expect GRE frames */
+		if (info->sstate != PPTP_SESSION_CONFIRMED) {
+			DEBUGP("%s but no session\n", strMName[msg]);
+			break;
+		}
+		if (info->cstate != PPTP_CALL_OUT_REQ &&
+		    info->cstate != PPTP_CALL_OUT_CONF) {
+			DEBUGP("%s without OUTCALL_REQ\n", strMName[msg]);
+			break;
+		}
+		if (pptpReq.ocack->resultCode != PPTP_OUTCALL_CONNECT) {
+			info->cstate = PPTP_CALL_NONE;
+			break;
+		}
+
+		cid = &pptpReq.ocack->callID;
+		pcid = &pptpReq.ocack->peersCallID;
+
+		info->pac_call_id = ntohs(*cid);
+		
+		if (htons(info->pns_call_id) != *pcid) {
+			DEBUGP("%s for unknown callid %u\n",
+				strMName[msg], ntohs(*pcid));
+			break;
+		}
+
+		DEBUGP("%s, CID=%X, PCID=%X\n", strMName[msg], 
+			ntohs(*cid), ntohs(*pcid));
+		
+		info->cstate = PPTP_CALL_OUT_CONF;
+
+		seq = ntohl(tcph->seq) + ((void *)pcid - (void *)pptph);
+		if (exp_gre(ct, seq, *cid, *pcid) != 0)
+			printk("ip_conntrack_pptp: error during exp_gre\n");
+		break;
+
+	case PPTP_IN_CALL_REQUEST:
+		/* server tells us about incoming call request */
+		if (info->sstate != PPTP_SESSION_CONFIRMED) {
+			DEBUGP("%s but no session\n", strMName[msg]);
+			break;
+		}
+		pcid = &pptpReq.icack->peersCallID;
+		DEBUGP("%s, PCID=%X\n", strMName[msg], ntohs(*pcid));
+		info->cstate = PPTP_CALL_IN_REQ;
+		info->pac_call_id= ntohs(*pcid);
+		break;
+
+	case PPTP_IN_CALL_CONNECT:
+		/* server tells us about incoming call established */
+		if (info->sstate != PPTP_SESSION_CONFIRMED) {
+			DEBUGP("%s but no session\n", strMName[msg]);
+			break;
+		}
+		if (info->sstate != PPTP_CALL_IN_REP
+		    && info->sstate != PPTP_CALL_IN_CONF) {
+			DEBUGP("%s but never sent IN_CALL_REPLY\n",
+				strMName[msg]);
+			break;
+		}
+
+		pcid = &pptpReq.iccon->peersCallID;
+		cid = &info->pac_call_id;
+
+		if (info->pns_call_id != ntohs(*pcid)) {
+			DEBUGP("%s for unknown CallID %u\n", 
+				strMName[msg], ntohs(*cid));
+			break;
+		}
+
+		DEBUGP("%s, PCID=%X\n", strMName[msg], ntohs(*pcid));
+		info->cstate = PPTP_CALL_IN_CONF;
+
+		/* we expect a GRE connection from PAC to PNS */
+		seq = ntohl(tcph->seq) + ((void *)pcid - (void *)pptph);
+		if (exp_gre(ct, seq, *cid, *pcid) != 0)
+			printk("ip_conntrack_pptp: error during exp_gre\n");
+
+		break;
+
+	case PPTP_CALL_DISCONNECT_NOTIFY:
+		/* server confirms disconnect */
+		cid = &pptpReq.disc->callID;
+		DEBUGP("%s, CID=%X\n", strMName[msg], ntohs(*cid));
+		info->cstate = PPTP_CALL_NONE;
+
+		/* untrack this call id, unexpect GRE packets */
+		pptp_timeout_related(ct);
+		break;
+
+	case PPTP_WAN_ERROR_NOTIFY:
+		break;
+
+	case PPTP_ECHO_REQUEST:
+	case PPTP_ECHO_REPLY:
+		/* I don't have to explain these ;) */
+		break;
+	default:
+		DEBUGP("invalid %s (TY=%d)\n", (msg <= PPTP_MSG_MAX)
+			? strMName[msg]:strMName[0], msg);
+		break;
+	}
+
+	return NF_ACCEPT;
+
+}
+
+static inline int
+pptp_outbound_pkt(struct tcphdr *tcph,
+		  struct pptp_pkt_hdr *pptph,
+		  size_t datalen,
+		  struct ip_conntrack *ct,
+		  enum ip_conntrack_info ctinfo)
+{
+	struct PptpControlHeader *ctlh;
+        union pptp_ctrl_union pptpReq;
+	struct ip_ct_pptp_master *info = &ct->help.ct_pptp_info;
+	u_int16_t msg, *cid, *pcid;
+
+	ctlh = (struct PptpControlHeader *) ((void *) pptph + sizeof(*pptph));
+	pptpReq.rawreq = (void *) ((void *) ctlh + sizeof(*ctlh));
+
+	msg = ntohs(ctlh->messageType);
+	DEBUGP("outbound control message %s\n", strMName[msg]);
+
+	switch (msg) {
+	case PPTP_START_SESSION_REQUEST:
+		/* client requests for new control session */
+		if (info->sstate != PPTP_SESSION_NONE) {
+			DEBUGP("%s but we already have one",
+				strMName[msg]);
+		}
+		info->sstate = PPTP_SESSION_REQUESTED;
+		break;
+	case PPTP_STOP_SESSION_REQUEST:
+		/* client requests end of control session */
+		info->sstate = PPTP_SESSION_STOPREQ;
+		break;
+
+	case PPTP_OUT_CALL_REQUEST:
+		/* client initiating connection to server */
+		if (info->sstate != PPTP_SESSION_CONFIRMED) {
+			DEBUGP("%s but no session\n",
+				strMName[msg]);
+			break;
+		}
+		info->cstate = PPTP_CALL_OUT_REQ;
+		/* track PNS call id */
+		cid = &pptpReq.ocreq->callID;
+		DEBUGP("%s, CID=%X\n", strMName[msg], ntohs(*cid));
+		info->pns_call_id = ntohs(*cid);
+		break;
+	case PPTP_IN_CALL_REPLY:
+		/* client answers incoming call */
+		if (info->cstate != PPTP_CALL_IN_REQ
+		    && info->cstate != PPTP_CALL_IN_REP) {
+			DEBUGP("%s without incall_req\n", 
+				strMName[msg]);
+			break;
+		}
+		if (pptpReq.icack->resultCode != PPTP_INCALL_ACCEPT) {
+			info->cstate = PPTP_CALL_NONE;
+			break;
+		}
+		pcid = &pptpReq.icack->peersCallID;
+		if (info->pac_call_id != ntohs(*pcid)) {
+			DEBUGP("%s for unknown call %u\n", 
+				strMName[msg], ntohs(*pcid));
+			break;
+		}
+		DEBUGP("%s, CID=%X\n", strMName[msg], ntohs(*pcid));
+		/* part two of the three-way handshake */
+		info->cstate = PPTP_CALL_IN_REP;
+		info->pns_call_id = ntohs(pptpReq.icack->callID);
+		break;
+
+	case PPTP_CALL_CLEAR_REQUEST:
+		/* client requests hangup of call */
+		if (info->sstate != PPTP_SESSION_CONFIRMED) {
+			DEBUGP("CLEAR_CALL but no session\n");
+			break;
+		}
+		/* FUTURE: iterate over all calls and check if
+		 * call ID is valid.  We don't do this without newnat,
+		 * because we only know about last call */
+		info->cstate = PPTP_CALL_CLEAR_REQ;
+		break;
+	case PPTP_SET_LINK_INFO:
+		break;
+	case PPTP_ECHO_REQUEST:
+	case PPTP_ECHO_REPLY:
+		/* I don't have to explain these ;) */
+		break;
+	default:
+		DEBUGP("invalid %s (TY=%d)\n", (msg <= PPTP_MSG_MAX)? 
+			strMName[msg]:strMName[0], msg);
+		/* unknown: no need to create GRE masq table entry */
+		break;
+	}
+
+	return NF_ACCEPT;
+}
+
+
+/* track caller id inside control connection, call expect_related */
+static int 
+conntrack_pptp_help(const struct iphdr *iph, size_t len,
+		    struct ip_conntrack *ct, enum ip_conntrack_info ctinfo)
+
+{
+	struct pptp_pkt_hdr *pptph;
+	
+	struct tcphdr *tcph = (void *) iph + iph->ihl * 4;
+	u_int32_t tcplen = len - iph->ihl * 4;
+	u_int32_t datalen = tcplen - tcph->doff * 4;
+	void *datalimit;
+	int dir = CTINFO2DIR(ctinfo);
+	struct ip_ct_pptp_master *info = &ct->help.ct_pptp_info;
+
+	int oldsstate, oldcstate;
+	int ret;
+
+	/* don't do any tracking before tcp handshake complete */
+	if (ctinfo != IP_CT_ESTABLISHED 
+	    && ctinfo != IP_CT_ESTABLISHED+IP_CT_IS_REPLY) {
+		DEBUGP("ctinfo = %u, skipping\n", ctinfo);
+		return NF_ACCEPT;
+	}
+	
+	/* not a complete TCP header? */
+	if (tcplen < sizeof(struct tcphdr) || tcplen < tcph->doff * 4) {
+		DEBUGP("tcplen = %u\n", tcplen);
+		return NF_ACCEPT;
+	}
+
+	/* checksum invalid? */
+	if (tcp_v4_check(tcph, tcplen, iph->saddr, iph->daddr,
+			csum_partial((char *) tcph, tcplen, 0))) {
+		printk(KERN_NOTICE __FILE__ ": bad csum\n");
+		/* W2K PPTP server sends TCP packets with wrong checksum :(( */
+		//return NF_ACCEPT;
+	}
+
+	if (tcph->fin || tcph->rst) {
+		DEBUGP("RST/FIN received, timeouting GRE\n");
+		/* can't do this after real newnat */
+		info->cstate = PPTP_CALL_NONE;
+
+		/* untrack this call id, unexpect GRE packets */
+		pptp_timeout_related(ct);
+	}
+
+
+	pptph = (struct pptp_pkt_hdr *) ((void *) tcph + tcph->doff * 4);
+	datalimit = (void *) pptph + datalen;
+
+	/* not a full pptp packet header? */
+	if ((void *) pptph+sizeof(*pptph) >= datalimit) {
+		DEBUGP("no full PPTP header, can't track\n");
+		return NF_ACCEPT;
+	}
+	
+	/* if it's not a control message we can't do anything with it */
+        if (ntohs(pptph->packetType) != PPTP_PACKET_CONTROL ||
+	    ntohl(pptph->magicCookie) != PPTP_MAGIC_COOKIE) {
+		DEBUGP("not a control packet\n");
+		return NF_ACCEPT;
+	}
+
+	oldsstate = info->sstate;
+	oldcstate = info->cstate;
+
+	LOCK_BH(&ip_pptp_lock);
+
+	/* FIXME: We just blindly assume that the control connection is always
+	 * established from PNS->PAC.  However, RFC makes no guarantee */
+	if (dir == IP_CT_DIR_ORIGINAL)
+		/* client -> server (PNS -> PAC) */
+		ret = pptp_outbound_pkt(tcph, pptph, datalen, ct, ctinfo);
+	else
+		/* server -> client (PAC -> PNS) */
+		ret = pptp_inbound_pkt(tcph, pptph, datalen, ct, ctinfo);
+	DEBUGP("sstate: %d->%d, cstate: %d->%d\n",
+		oldsstate, info->sstate, oldcstate, info->cstate);
+	UNLOCK_BH(&ip_pptp_lock);
+
+	return ret;
+}
+
+/* control protocol helper */
+static struct ip_conntrack_helper pptp = { 
+	.list = { NULL, NULL },
+	.name = "pptp", 
+	.flags = IP_CT_HELPER_F_REUSE_EXPECT,
+	.me = THIS_MODULE,
+	.max_expected = 2,
+	.timeout = 0,
+	.tuple = { .src = { .ip = 0, 
+		 	    .u = { .tcp = { .port =  
+				    __constant_htons(PPTP_CONTROL_PORT) } } 
+			  }, 
+		   .dst = { .ip = 0, 
+			    .u = { .all = 0 },
+			    .protonum = IPPROTO_TCP
+			  } 
+		 },
+	.mask = { .src = { .ip = 0, 
+			   .u = { .tcp = { .port = 0xffff } } 
+			 }, 
+		  .dst = { .ip = 0, 
+			   .u = { .all = 0 },
+			   .protonum = 0xffff 
+		 	 } 
+		},
+	.help = conntrack_pptp_help
+};
+
+/* ip_conntrack_pptp initialization */
+static int __init init(void)
+{
+	int retcode;
+
+	DEBUGP(__FILE__ ": registering helper\n");
+	if ((retcode = ip_conntrack_helper_register(&pptp))) {
+                printk(KERN_ERR "Unable to register conntrack application "
+				"helper for pptp: %d\n", retcode);
+		return -EIO;
+	}
+
+	printk("ip_conntrack_pptp version %s loaded\n", IP_CT_PPTP_VERSION);
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	ip_conntrack_helper_unregister(&pptp);
+	printk("ip_conntrack_pptp version %s unloaded\n", IP_CT_PPTP_VERSION);
+}
+
+module_init(init);
+module_exit(fini);
+
+EXPORT_SYMBOL(ip_pptp_lock);
diff -uNr linux_org/net/ipv4/netfilter/ip_conntrack_pptp_priv.h linux/net/ipv4/netfilter/ip_conntrack_pptp_priv.h
--- linux_org/net/ipv4/netfilter/ip_conntrack_pptp_priv.h	1970-01-01 01:00:00.000000000 +0100
+++ linux/net/ipv4/netfilter/ip_conntrack_pptp_priv.h	2006-10-27 14:11:52.000000000 +0200
@@ -0,0 +1,24 @@
+#ifndef _IP_CT_PPTP_PRIV_H
+#define _IP_CT_PPTP_PRIV_H
+
+/* PptpControlMessageType names */
+static const char *strMName[] = {
+	"UNKNOWN_MESSAGE",
+	"START_SESSION_REQUEST",
+	"START_SESSION_REPLY",
+	"STOP_SESSION_REQUEST",
+	"STOP_SESSION_REPLY",
+	"ECHO_REQUEST",
+	"ECHO_REPLY",
+	"OUT_CALL_REQUEST",
+	"OUT_CALL_REPLY",
+	"IN_CALL_REQUEST",
+	"IN_CALL_REPLY",
+	"IN_CALL_CONNECT",
+	"CALL_CLEAR_REQUEST",
+	"CALL_DISCONNECT_NOTIFY",
+	"WAN_ERROR_NOTIFY",
+	"SET_LINK_INFO"
+};
+
+#endif
diff -uNr linux_org/net/ipv4/netfilter/ip_conntrack_proto_gre.c linux/net/ipv4/netfilter/ip_conntrack_proto_gre.c
--- linux_org/net/ipv4/netfilter/ip_conntrack_proto_gre.c	1970-01-01 01:00:00.000000000 +0100
+++ linux/net/ipv4/netfilter/ip_conntrack_proto_gre.c	2006-10-27 14:11:52.000000000 +0200
@@ -0,0 +1,343 @@
+/*
+ * ip_conntrack_proto_gre.c - Version 1.2 
+ *
+ * Connection tracking protocol helper module for GRE.
+ *
+ * GRE is a generic encapsulation protocol, which is generally not very
+ * suited for NAT, as it has no protocol-specific part as port numbers.
+ *
+ * It has an optional key field, which may help us distinguishing two 
+ * connections between the same two hosts.
+ *
+ * GRE is defined in RFC 1701 and RFC 1702, as well as RFC 2784 
+ *
+ * PPTP is built on top of a modified version of GRE, and has a mandatory
+ * field called "CallID", which serves us for the same purpose as the key
+ * field in plain GRE.
+ *
+ * Documentation about PPTP can be found in RFC 2637
+ *
+ * (C) 2000-2003 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <linux/in.h>
+#include <linux/list.h>
+
+#include <linux/netfilter_ipv4/lockhelp.h>
+
+DECLARE_RWLOCK(ip_ct_gre_lock);
+#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_ct_gre_lock)
+#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_ct_gre_lock)
+
+#include <linux/netfilter_ipv4/listhelp.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+
+#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
+#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("netfilter connection tracking protocol helper for GRE");
+
+/* shamelessly stolen from ip_conntrack_proto_udp.c */
+#define GRE_TIMEOUT		(30*HZ)
+#define GRE_STREAM_TIMEOUT	(180*HZ)
+
+#if 0
+#define DEBUGP(format, args...) printk(KERN_DEBUG __FILE__ ":" __FUNCTION__ \
+		                       ": " format, ## args)
+#define DUMP_TUPLE_GRE(x) printk("%u.%u.%u.%u:0x%x -> %u.%u.%u.%u:0x%x:%u:0x%x\n", \
+			NIPQUAD((x)->src.ip), ntohl((x)->src.u.gre.key), \
+			NIPQUAD((x)->dst.ip), ntohl((x)->dst.u.gre.key), \
+			(x)->dst.u.gre.version, \
+			ntohs((x)->dst.u.gre.protocol))
+#else
+#define DEBUGP(x, args...)
+#define DUMP_TUPLE_GRE(x)
+#endif
+				
+/* GRE KEYMAP HANDLING FUNCTIONS */
+static LIST_HEAD(gre_keymap_list);
+
+static inline int gre_key_cmpfn(const struct ip_ct_gre_keymap *km,
+				const struct ip_conntrack_tuple *t)
+{
+	return ((km->tuple.src.ip == t->src.ip) &&
+		(km->tuple.dst.ip == t->dst.ip) &&
+	        (km->tuple.dst.protonum == t->dst.protonum) &&
+	        (km->tuple.dst.u.all == t->dst.u.all));
+}
+
+/* look up the source key for a given tuple */
+static u_int32_t gre_keymap_lookup(struct ip_conntrack_tuple *t)
+{
+	struct ip_ct_gre_keymap *km;
+	u_int32_t key;
+
+	READ_LOCK(&ip_ct_gre_lock);
+	km = LIST_FIND(&gre_keymap_list, gre_key_cmpfn,
+			struct ip_ct_gre_keymap *, t);
+	if (!km) {
+		READ_UNLOCK(&ip_ct_gre_lock);
+		return 0;
+	}
+
+	key = km->tuple.src.u.gre.key;
+	READ_UNLOCK(&ip_ct_gre_lock);
+
+	return key;
+}
+
+/* add a single keymap entry, associate with specified expect */
+int ip_ct_gre_keymap_add(struct ip_conntrack_expect *exp,
+			 struct ip_conntrack_tuple *t, int reply)
+{
+	struct ip_ct_gre_keymap *km;
+
+	km = kmalloc(sizeof(*km), GFP_ATOMIC);
+	if (!km)
+		return -1;
+
+	/* initializing list head should be sufficient */
+	memset(km, 0, sizeof(*km));
+
+	memcpy(&km->tuple, t, sizeof(*t));
+
+	if (!reply)
+		exp->proto.gre.keymap_orig = km;
+	else
+		exp->proto.gre.keymap_reply = km;
+
+	DEBUGP("adding new entry %p: ", km);
+	DUMP_TUPLE_GRE(&km->tuple);
+
+	WRITE_LOCK(&ip_ct_gre_lock);
+	list_append(&gre_keymap_list, km);
+	WRITE_UNLOCK(&ip_ct_gre_lock);
+
+	return 0;
+}
+
+/* change the tuple of a keymap entry (used by nat helper) */
+void ip_ct_gre_keymap_change(struct ip_ct_gre_keymap *km,
+			     struct ip_conntrack_tuple *t)
+{
+	DEBUGP("changing entry %p to: ", km);
+	DUMP_TUPLE_GRE(t);
+
+	WRITE_LOCK(&ip_ct_gre_lock);
+	memcpy(&km->tuple, t, sizeof(km->tuple));
+	WRITE_UNLOCK(&ip_ct_gre_lock);
+}
+
+/* destroy the keymap entries associated with specified expect */
+void ip_ct_gre_keymap_destroy(struct ip_conntrack_expect *exp)
+{
+	DEBUGP("entering for exp %p\n", exp);
+	WRITE_LOCK(&ip_ct_gre_lock);
+	if (exp->proto.gre.keymap_orig) {
+		DEBUGP("removing %p from list\n", exp->proto.gre.keymap_orig);
+		list_del(&exp->proto.gre.keymap_orig->list);
+		kfree(exp->proto.gre.keymap_orig);
+		exp->proto.gre.keymap_orig = NULL;
+	}
+	if (exp->proto.gre.keymap_reply) {
+		DEBUGP("removing %p from list\n", exp->proto.gre.keymap_reply);
+		list_del(&exp->proto.gre.keymap_reply->list);
+		kfree(exp->proto.gre.keymap_reply);
+		exp->proto.gre.keymap_reply = NULL;
+	}
+	WRITE_UNLOCK(&ip_ct_gre_lock);
+}
+
+
+/* PUBLIC CONNTRACK PROTO HELPER FUNCTIONS */
+
+/* invert gre part of tuple */
+static int gre_invert_tuple(struct ip_conntrack_tuple *tuple,
+			    const struct ip_conntrack_tuple *orig)
+{
+	tuple->dst.u.gre.protocol = orig->dst.u.gre.protocol;
+	tuple->dst.u.gre.version = orig->dst.u.gre.version;
+
+	tuple->dst.u.gre.key = orig->src.u.gre.key;
+	tuple->src.u.gre.key = orig->dst.u.gre.key;
+
+	return 1;
+}
+
+/* gre hdr info to tuple */
+static int gre_pkt_to_tuple(const void *datah, size_t datalen,
+			    struct ip_conntrack_tuple *tuple)
+{
+	struct gre_hdr *grehdr = (struct gre_hdr *) datah;
+	struct gre_hdr_pptp *pgrehdr = (struct gre_hdr_pptp *) datah;
+	u_int32_t srckey;
+
+	/* core guarantees 8 protocol bytes, no need for size check */
+
+	tuple->dst.u.gre.version = grehdr->version; 
+	tuple->dst.u.gre.protocol = grehdr->protocol;
+
+	switch (grehdr->version) {
+		case GRE_VERSION_1701:
+			if (!grehdr->key) {
+				DEBUGP("Can't track GRE without key\n");
+				return 0;
+			}
+			tuple->dst.u.gre.key = *(gre_key(grehdr));
+			break;
+
+		case GRE_VERSION_PPTP:
+			if (ntohs(grehdr->protocol) != GRE_PROTOCOL_PPTP) {
+				DEBUGP("GRE_VERSION_PPTP but unknown proto\n");
+				return 0;
+			}
+			tuple->dst.u.gre.key = htonl(ntohs(pgrehdr->call_id));
+			break;
+
+		default:
+			printk(KERN_WARNING "unknown GRE version %hu\n",
+				tuple->dst.u.gre.version);
+			return 0;
+	}
+
+	srckey = gre_keymap_lookup(tuple);
+
+#if 0
+	DEBUGP("found src key %x for tuple ", ntohl(srckey));
+	DUMP_TUPLE_GRE(tuple);
+#endif
+	tuple->src.u.gre.key = srckey;
+
+	return 1;
+}
+
+/* print gre part of tuple */
+static unsigned int gre_print_tuple(char *buffer,
+				    const struct ip_conntrack_tuple *tuple)
+{
+	return sprintf(buffer, "version=%d protocol=0x%04x srckey=0x%x dstkey=0x%x ", 
+			tuple->dst.u.gre.version,
+			ntohs(tuple->dst.u.gre.protocol),
+			ntohl(tuple->src.u.gre.key),
+			ntohl(tuple->dst.u.gre.key));
+}
+
+/* print private data for conntrack */
+static unsigned int gre_print_conntrack(char *buffer,
+					const struct ip_conntrack *ct)
+{
+	return sprintf(buffer, "timeout=%u, stream_timeout=%u ",
+		       (ct->proto.gre.timeout / HZ),
+		       (ct->proto.gre.stream_timeout / HZ));
+}
+
+/* Returns verdict for packet, and may modify conntrack */
+static int gre_packet(struct ip_conntrack *ct,
+		      struct iphdr *iph, size_t len,
+		      enum ip_conntrack_info conntrackinfo)
+{
+	/* If we've seen traffic both ways, this is a GRE connection.
+	 * Extend timeout. */
+	if (ct->status & IPS_SEEN_REPLY) {
+		ip_ct_refresh(ct, ct->proto.gre.stream_timeout);
+		/* Also, more likely to be important, and not a probe. */
+		set_bit(IPS_ASSURED_BIT, &ct->status);
+	} else
+		ip_ct_refresh(ct, ct->proto.gre.timeout);
+	
+	return NF_ACCEPT;
+}
+
+/* Called when a new connection for this protocol found. */
+static int gre_new(struct ip_conntrack *ct,
+		   struct iphdr *iph, size_t len)
+{ 
+	DEBUGP(": ");
+	DUMP_TUPLE_GRE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+
+	/* initialize to sane value.  Ideally a conntrack helper
+	 * (e.g. in case of pptp) is increasing them */
+	ct->proto.gre.stream_timeout = GRE_STREAM_TIMEOUT;
+	ct->proto.gre.timeout = GRE_TIMEOUT;
+
+	return 1;
+}
+
+/* Called when a conntrack entry has already been removed from the hashes
+ * and is about to be deleted from memory */
+static void gre_destroy(struct ip_conntrack *ct)
+{
+	struct ip_conntrack_expect *master = ct->master;
+
+	DEBUGP(" entering\n");
+
+	if (!master) {
+		DEBUGP("no master exp for ct %p\n", ct);
+		return;
+	}
+
+	ip_ct_gre_keymap_destroy(master);
+}
+
+/* protocol helper struct */
+static struct ip_conntrack_protocol gre = { { NULL, NULL }, IPPROTO_GRE,
+					    "gre", 
+					    gre_pkt_to_tuple,
+					    gre_invert_tuple,
+					    gre_print_tuple,
+					    gre_print_conntrack,
+					    gre_packet,
+					    gre_new,
+					    gre_destroy,
+					    NULL,
+					    THIS_MODULE };
+
+/* ip_conntrack_proto_gre initialization */
+static int __init init(void)
+{
+	int retcode;
+
+	if ((retcode = ip_conntrack_protocol_register(&gre))) {
+                printk(KERN_ERR "Unable to register conntrack protocol "
+			        "helper for gre: %d\n",	retcode);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	struct list_head *pos, *n;
+
+	/* delete all keymap entries */
+	WRITE_LOCK(&ip_ct_gre_lock);
+	list_for_each_safe(pos, n, &gre_keymap_list) {
+		DEBUGP("deleting keymap %p at module unload time\n", pos);
+		list_del(pos);
+		kfree(pos);
+	}
+	WRITE_UNLOCK(&ip_ct_gre_lock);
+
+	ip_conntrack_protocol_unregister(&gre); 
+}
+
+EXPORT_SYMBOL(ip_ct_gre_keymap_add);
+EXPORT_SYMBOL(ip_ct_gre_keymap_change);
+EXPORT_SYMBOL(ip_ct_gre_keymap_destroy);
+
+module_init(init);
+module_exit(fini);
diff -uNr linux_org/net/ipv4/netfilter/ip_nat_core.c linux/net/ipv4/netfilter/ip_nat_core.c
--- linux_org/net/ipv4/netfilter/ip_nat_core.c	2004-11-24 12:14:04.000000000 +0100
+++ linux/net/ipv4/netfilter/ip_nat_core.c	2006-10-27 14:11:52.000000000 +0200
@@ -430,7 +430,7 @@
 	*tuple = *orig_tuple;
 	while ((rptr = find_best_ips_proto_fast(tuple, mr, conntrack, hooknum))
 	       != NULL) {
-		DEBUGP("Found best for "); DUMP_TUPLE(tuple);
+		DEBUGP("Found best for "); DUMP_TUPLE_RAW(tuple);
 		/* 3) The per-protocol part of the manip is made to
 		   map into the range to make a unique tuple. */
 
@@ -572,9 +572,9 @@
 		       HOOK2MANIP(hooknum)==IP_NAT_MANIP_SRC ? "SRC" : "DST",
 		       conntrack);
 		DEBUGP("Original: ");
-		DUMP_TUPLE(&orig_tp);
+		DUMP_TUPLE_RAW(&orig_tp);
 		DEBUGP("New: ");
-		DUMP_TUPLE(&new_tuple);
+		DUMP_TUPLE_RAW(&new_tuple);
 #endif
 
 		/* We now have two tuples (SRCIP/SRCPT/DSTIP/DSTPT):
diff -uNr linux_org/net/ipv4/netfilter/ip_nat_core.c.orig linux/net/ipv4/netfilter/ip_nat_core.c.orig
--- linux_org/net/ipv4/netfilter/ip_nat_core.c.orig	1970-01-01 01:00:00.000000000 +0100
+++ linux/net/ipv4/netfilter/ip_nat_core.c.orig	2004-11-24 12:14:04.000000000 +0100
@@ -0,0 +1,1014 @@
+/* NAT for netfilter; shared with compatibility layer. */
+
+/* (c) 1999 Paul `Rusty' Russell.  Licenced under the GNU General
+   Public Licence. */
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/brlock.h>
+#include <linux/vmalloc.h>
+#include <net/checksum.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/tcp.h>  /* For tcp_prot in getorigdst */
+
+#define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_nat_lock)
+#define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_nat_lock)
+
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/ip_conntrack_protocol.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+#include <linux/netfilter_ipv4/ip_nat_core.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/listhelp.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+DECLARE_RWLOCK(ip_nat_lock);
+DECLARE_RWLOCK_EXTERN(ip_conntrack_lock);
+
+/* Calculated at init based on memory size */
+static unsigned int ip_nat_htable_size;
+
+static struct list_head *bysource;
+static struct list_head *byipsproto;
+LIST_HEAD(protos);
+LIST_HEAD(helpers);
+
+extern struct ip_nat_protocol unknown_nat_protocol;
+
+/* We keep extra hashes for each conntrack, for fast searching. */
+static inline size_t
+hash_by_ipsproto(u_int32_t src, u_int32_t dst, u_int16_t proto)
+{
+	/* Modified src and dst, to ensure we don't create two
+           identical streams. */
+	return (src + dst + proto) % ip_nat_htable_size;
+}
+
+static inline size_t
+hash_by_src(const struct ip_conntrack_manip *manip, u_int16_t proto)
+{
+	/* Original src, to ensure we map it consistently if poss. */
+	return (manip->ip + manip->u.all + proto) % ip_nat_htable_size;
+}
+
+/* Noone using conntrack by the time this called. */
+static void ip_nat_cleanup_conntrack(struct ip_conntrack *conn)
+{
+	struct ip_nat_info *info = &conn->nat.info;
+	unsigned int hs, hp;
+
+	if (!info->initialized)
+		return;
+
+	IP_NF_ASSERT(info->bysource.conntrack);
+	IP_NF_ASSERT(info->byipsproto.conntrack);
+
+	hs = hash_by_src(&conn->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src,
+	                 conn->tuplehash[IP_CT_DIR_ORIGINAL]
+	                 .tuple.dst.protonum);
+
+	hp = hash_by_ipsproto(conn->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip,
+	                      conn->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip,
+	                      conn->tuplehash[IP_CT_DIR_REPLY]
+	                      .tuple.dst.protonum);
+
+	WRITE_LOCK(&ip_nat_lock);
+	LIST_DELETE(&bysource[hs], &info->bysource);
+	LIST_DELETE(&byipsproto[hp], &info->byipsproto);
+	WRITE_UNLOCK(&ip_nat_lock);
+}
+
+/* We do checksum mangling, so if they were wrong before they're still
+ * wrong.  Also works for incomplete packets (eg. ICMP dest
+ * unreachables.) */
+u_int16_t
+ip_nat_cheat_check(u_int32_t oldvalinv, u_int32_t newval, u_int16_t oldcheck)
+{
+	u_int32_t diffs[] = { oldvalinv, newval };
+	return csum_fold(csum_partial((char *)diffs, sizeof(diffs),
+				      oldcheck^0xFFFF));
+}
+
+static inline int cmp_proto(const struct ip_nat_protocol *i, int proto)
+{
+	return i->protonum == proto;
+}
+
+struct ip_nat_protocol *
+find_nat_proto(u_int16_t protonum)
+{
+	struct ip_nat_protocol *i;
+
+	MUST_BE_READ_LOCKED(&ip_nat_lock);
+	i = LIST_FIND(&protos, cmp_proto, struct ip_nat_protocol *, protonum);
+	if (!i)
+		i = &unknown_nat_protocol;
+	return i;
+}
+
+/* Is this tuple already taken? (not by us) */
+int
+ip_nat_used_tuple(const struct ip_conntrack_tuple *tuple,
+		  const struct ip_conntrack *ignored_conntrack)
+{
+	/* Conntrack tracking doesn't keep track of outgoing tuples; only
+	   incoming ones.  NAT means they don't have a fixed mapping,
+	   so we invert the tuple and look for the incoming reply.
+
+	   We could keep a separate hash if this proves too slow. */
+	struct ip_conntrack_tuple reply;
+
+	invert_tuplepr(&reply, tuple);
+	return ip_conntrack_tuple_taken(&reply, ignored_conntrack);
+}
+
+/* Does tuple + the source manip come within the range mr */
+static int
+in_range(const struct ip_conntrack_tuple *tuple,
+	 const struct ip_conntrack_manip *manip,
+	 const struct ip_nat_multi_range *mr)
+{
+	struct ip_nat_protocol *proto = find_nat_proto(tuple->dst.protonum);
+	unsigned int i;
+	struct ip_conntrack_tuple newtuple = { *manip, tuple->dst };
+
+	for (i = 0; i < mr->rangesize; i++) {
+		/* If we are allowed to map IPs, then we must be in the
+		   range specified, otherwise we must be unchanged. */
+		if (mr->range[i].flags & IP_NAT_RANGE_MAP_IPS) {
+			if (ntohl(newtuple.src.ip) < ntohl(mr->range[i].min_ip)
+			    || (ntohl(newtuple.src.ip)
+				> ntohl(mr->range[i].max_ip)))
+				continue;
+		} else {
+			if (newtuple.src.ip != tuple->src.ip)
+				continue;
+		}
+
+		if ((mr->range[i].flags & IP_NAT_RANGE_PROTO_SPECIFIED)
+		    && proto->in_range(&newtuple, IP_NAT_MANIP_SRC,
+				       &mr->range[i].min, &mr->range[i].max))
+			return 1;
+	}
+	return 0;
+}
+
+static inline int
+src_cmp(const struct ip_nat_hash *i,
+	const struct ip_conntrack_tuple *tuple,
+	const struct ip_nat_multi_range *mr)
+{
+	return (i->conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum
+		== tuple->dst.protonum
+		&& i->conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip
+		== tuple->src.ip
+		&& i->conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.all
+		== tuple->src.u.all
+		&& in_range(tuple,
+			    &i->conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
+			    .tuple.src,
+			    mr));
+}
+
+/* Only called for SRC manip */
+static struct ip_conntrack_manip *
+find_appropriate_src(const struct ip_conntrack_tuple *tuple,
+		     const struct ip_nat_multi_range *mr)
+{
+	unsigned int h = hash_by_src(&tuple->src, tuple->dst.protonum);
+	struct ip_nat_hash *i;
+
+	MUST_BE_READ_LOCKED(&ip_nat_lock);
+	i = LIST_FIND(&bysource[h], src_cmp, struct ip_nat_hash *, tuple, mr);
+	if (i)
+		return &i->conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src;
+	else
+		return NULL;
+}
+
+#ifdef CONFIG_IP_NF_NAT_LOCAL
+/* If it's really a local destination manip, it may need to do a
+   source manip too. */
+static int
+do_extra_mangle(u_int32_t var_ip, u_int32_t *other_ipp)
+{
+	struct rtable *rt;
+
+	/* FIXME: IPTOS_TOS(iph->tos) --RR */
+	if (ip_route_output(&rt, var_ip, 0, 0, 0) != 0) {
+		DEBUGP("do_extra_mangle: Can't get route to %u.%u.%u.%u\n",
+		       NIPQUAD(var_ip));
+		return 0;
+	}
+
+	*other_ipp = rt->rt_src;
+	ip_rt_put(rt);
+	return 1;
+}
+#endif
+
+/* Simple way to iterate through all. */
+static inline int fake_cmp(const struct ip_nat_hash *i,
+			   u_int32_t src, u_int32_t dst, u_int16_t protonum,
+			   unsigned int *score,
+			   const struct ip_conntrack *conntrack)
+{
+	/* Compare backwards: we're dealing with OUTGOING tuples, and
+           inside the conntrack is the REPLY tuple.  Don't count this
+           conntrack. */
+	if (i->conntrack != conntrack
+	    && i->conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip == dst
+	    && i->conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip == src
+	    && (i->conntrack->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum
+		== protonum))
+		(*score)++;
+	return 0;
+}
+
+static inline unsigned int
+count_maps(u_int32_t src, u_int32_t dst, u_int16_t protonum,
+	   const struct ip_conntrack *conntrack)
+{
+	unsigned int score = 0;
+	unsigned int h;
+
+	MUST_BE_READ_LOCKED(&ip_nat_lock);
+	h = hash_by_ipsproto(src, dst, protonum);
+	LIST_FIND(&byipsproto[h], fake_cmp, struct ip_nat_hash *,
+	          src, dst, protonum, &score, conntrack);
+
+	return score;
+}
+
+/* For [FUTURE] fragmentation handling, we want the least-used
+   src-ip/dst-ip/proto triple.  Fairness doesn't come into it.  Thus
+   if the range specifies 1.2.3.4 ports 10000-10005 and 1.2.3.5 ports
+   1-65535, we don't do pro-rata allocation based on ports; we choose
+   the ip with the lowest src-ip/dst-ip/proto usage.
+
+   If an allocation then fails (eg. all 6 ports used in the 1.2.3.4
+   range), we eliminate that and try again.  This is not the most
+   efficient approach, but if you're worried about that, don't hand us
+   ranges you don't really have.  */
+static struct ip_nat_range *
+find_best_ips_proto(struct ip_conntrack_tuple *tuple,
+		    const struct ip_nat_multi_range *mr,
+		    const struct ip_conntrack *conntrack,
+		    unsigned int hooknum)
+{
+	unsigned int i;
+	struct {
+		const struct ip_nat_range *range;
+		unsigned int score;
+		struct ip_conntrack_tuple tuple;
+	} best = { NULL,  0xFFFFFFFF };
+	u_int32_t *var_ipp, *other_ipp, saved_ip, orig_dstip;
+	static unsigned int randomness = 0;
+
+	if (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC) {
+		var_ipp = &tuple->src.ip;
+		saved_ip = tuple->dst.ip;
+		other_ipp = &tuple->dst.ip;
+	} else {
+		var_ipp = &tuple->dst.ip;
+		saved_ip = tuple->src.ip;
+		other_ipp = &tuple->src.ip;
+	}
+	/* Don't do do_extra_mangle unless neccessary (overrides
+           explicit socket bindings, for example) */
+	orig_dstip = tuple->dst.ip;
+
+	IP_NF_ASSERT(mr->rangesize >= 1);
+	for (i = 0; i < mr->rangesize; i++) {
+		/* Host order */
+		u_int32_t minip, maxip, j;
+
+		/* Don't do ranges which are already eliminated. */
+		if (mr->range[i].flags & IP_NAT_RANGE_FULL) {
+			continue;
+		}
+
+		if (mr->range[i].flags & IP_NAT_RANGE_MAP_IPS) {
+			minip = ntohl(mr->range[i].min_ip);
+			maxip = ntohl(mr->range[i].max_ip);
+		} else
+			minip = maxip = ntohl(*var_ipp);
+
+		randomness++;
+		for (j = 0; j < maxip - minip + 1; j++) {
+			unsigned int score;
+
+			*var_ipp = htonl(minip + (randomness + j) 
+					 % (maxip - minip + 1));
+
+			/* Reset the other ip in case it was mangled by
+			 * do_extra_mangle last time. */
+			*other_ipp = saved_ip;
+
+#ifdef CONFIG_IP_NF_NAT_LOCAL
+			if (hooknum == NF_IP_LOCAL_OUT
+			    && *var_ipp != orig_dstip
+			    && !do_extra_mangle(*var_ipp, other_ipp)) {
+				DEBUGP("Range %u %u.%u.%u.%u rt failed!\n",
+				       i, NIPQUAD(*var_ipp));
+				/* Can't route?  This whole range part is
+				 * probably screwed, but keep trying
+				 * anyway. */
+				continue;
+			}
+#endif
+
+			/* Count how many others map onto this. */
+			score = count_maps(tuple->src.ip, tuple->dst.ip,
+					   tuple->dst.protonum, conntrack);
+			if (score < best.score) {
+				/* Optimization: doesn't get any better than
+				   this. */
+				if (score == 0)
+					return (struct ip_nat_range *)
+						&mr->range[i];
+
+				best.score = score;
+				best.tuple = *tuple;
+				best.range = &mr->range[i];
+			}
+		}
+	}
+	*tuple = best.tuple;
+
+	/* Discard const. */
+	return (struct ip_nat_range *)best.range;
+}
+
+/* Fast version doesn't iterate through hash chains, but only handles
+   common case of single IP address (null NAT, masquerade) */
+static struct ip_nat_range *
+find_best_ips_proto_fast(struct ip_conntrack_tuple *tuple,
+			 const struct ip_nat_multi_range *mr,
+			 const struct ip_conntrack *conntrack,
+			 unsigned int hooknum)
+{
+	if (mr->rangesize != 1
+	    || (mr->range[0].flags & IP_NAT_RANGE_FULL)
+	    || ((mr->range[0].flags & IP_NAT_RANGE_MAP_IPS)
+		&& mr->range[0].min_ip != mr->range[0].max_ip))
+		return find_best_ips_proto(tuple, mr, conntrack, hooknum);
+
+	if (mr->range[0].flags & IP_NAT_RANGE_MAP_IPS) {
+		if (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC)
+			tuple->src.ip = mr->range[0].min_ip;
+		else {
+			/* Only do extra mangle when required (breaks
+                           socket binding) */
+#ifdef CONFIG_IP_NF_NAT_LOCAL
+			if (tuple->dst.ip != mr->range[0].min_ip
+			    && hooknum == NF_IP_LOCAL_OUT
+			    && !do_extra_mangle(mr->range[0].min_ip,
+						&tuple->src.ip))
+				return NULL;
+#endif
+			tuple->dst.ip = mr->range[0].min_ip;
+		}
+	}
+
+	/* Discard const. */
+	return (struct ip_nat_range *)&mr->range[0];
+}
+
+static int
+get_unique_tuple(struct ip_conntrack_tuple *tuple,
+		 const struct ip_conntrack_tuple *orig_tuple,
+		 const struct ip_nat_multi_range *mrr,
+		 struct ip_conntrack *conntrack,
+		 unsigned int hooknum)
+{
+	struct ip_nat_protocol *proto
+		= find_nat_proto(orig_tuple->dst.protonum);
+	struct ip_nat_range *rptr;
+	unsigned int i;
+	int ret;
+
+	/* We temporarily use flags for marking full parts, but we
+	   always clean up afterwards */
+	struct ip_nat_multi_range *mr = (void *)mrr;
+
+	/* 1) If this srcip/proto/src-proto-part is currently mapped,
+	   and that same mapping gives a unique tuple within the given
+	   range, use that.
+
+	   This is only required for source (ie. NAT/masq) mappings.
+	   So far, we don't do local source mappings, so multiple
+	   manips not an issue.  */
+	if (hooknum == NF_IP_POST_ROUTING) {
+		struct ip_conntrack_manip *manip;
+
+		manip = find_appropriate_src(orig_tuple, mr);
+		if (manip) {
+			/* Apply same source manipulation. */
+			*tuple = ((struct ip_conntrack_tuple)
+				  { *manip, orig_tuple->dst });
+			DEBUGP("get_unique_tuple: Found current src map\n");
+			return 1;
+		}
+	}
+
+	/* 2) Select the least-used IP/proto combination in the given
+	   range.
+	*/
+	*tuple = *orig_tuple;
+	while ((rptr = find_best_ips_proto_fast(tuple, mr, conntrack, hooknum))
+	       != NULL) {
+		DEBUGP("Found best for "); DUMP_TUPLE(tuple);
+		/* 3) The per-protocol part of the manip is made to
+		   map into the range to make a unique tuple. */
+
+		/* Only bother mapping if it's not already in range
+		   and unique */
+		if ((!(rptr->flags & IP_NAT_RANGE_PROTO_SPECIFIED)
+		     || proto->in_range(tuple, HOOK2MANIP(hooknum),
+					&rptr->min, &rptr->max))
+		    && !ip_nat_used_tuple(tuple, conntrack)) {
+			ret = 1;
+			goto clear_fulls;
+		} else {
+			if (proto->unique_tuple(tuple, rptr,
+						HOOK2MANIP(hooknum),
+						conntrack)) {
+				/* Must be unique. */
+				IP_NF_ASSERT(!ip_nat_used_tuple(tuple,
+								conntrack));
+				ret = 1;
+				goto clear_fulls;
+			} else if (HOOK2MANIP(hooknum) == IP_NAT_MANIP_DST) {
+				/* Try implicit source NAT; protocol
+                                   may be able to play with ports to
+                                   make it unique. */
+				struct ip_nat_range r
+					= { IP_NAT_RANGE_MAP_IPS, 
+					    tuple->src.ip, tuple->src.ip,
+					    { 0 }, { 0 } };
+				DEBUGP("Trying implicit mapping\n");
+				if (proto->unique_tuple(tuple, &r,
+							IP_NAT_MANIP_SRC,
+							conntrack)) {
+					/* Must be unique. */
+					IP_NF_ASSERT(!ip_nat_used_tuple
+						     (tuple, conntrack));
+					ret = 1;
+					goto clear_fulls;
+				}
+			}
+			DEBUGP("Protocol can't get unique tuple %u.\n",
+			       hooknum);
+		}
+
+		/* Eliminate that from range, and try again. */
+		rptr->flags |= IP_NAT_RANGE_FULL;
+		*tuple = *orig_tuple;
+	}
+
+	ret = 0;
+
+ clear_fulls:
+	/* Clear full flags. */
+	IP_NF_ASSERT(mr->rangesize >= 1);
+	for (i = 0; i < mr->rangesize; i++)
+		mr->range[i].flags &= ~IP_NAT_RANGE_FULL;
+
+	return ret;
+}
+
+static inline int
+helper_cmp(const struct ip_nat_helper *helper,
+	   const struct ip_conntrack_tuple *tuple)
+{
+	return ip_ct_tuple_mask_cmp(tuple, &helper->tuple, &helper->mask);
+}
+
+/* Where to manip the reply packets (will be reverse manip). */
+static unsigned int opposite_hook[NF_IP_NUMHOOKS]
+= { [NF_IP_PRE_ROUTING] = NF_IP_POST_ROUTING,
+    [NF_IP_POST_ROUTING] = NF_IP_PRE_ROUTING,
+#ifdef CONFIG_IP_NF_NAT_LOCAL
+    [NF_IP_LOCAL_OUT] = NF_IP_LOCAL_IN,
+    [NF_IP_LOCAL_IN] = NF_IP_LOCAL_OUT,
+#endif
+};
+
+unsigned int
+ip_nat_setup_info(struct ip_conntrack *conntrack,
+		  const struct ip_nat_multi_range *mr,
+		  unsigned int hooknum)
+{
+	struct ip_conntrack_tuple new_tuple, inv_tuple, reply;
+	struct ip_conntrack_tuple orig_tp;
+	struct ip_nat_info *info = &conntrack->nat.info;
+	int in_hashes = info->initialized;
+
+	MUST_BE_WRITE_LOCKED(&ip_nat_lock);
+	IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
+		     || hooknum == NF_IP_POST_ROUTING
+		     || hooknum == NF_IP_LOCAL_IN
+		     || hooknum == NF_IP_LOCAL_OUT);
+	IP_NF_ASSERT(info->num_manips < IP_NAT_MAX_MANIPS);
+	IP_NF_ASSERT(!(info->initialized & (1 << HOOK2MANIP(hooknum))));
+
+	/* What we've got will look like inverse of reply. Normally
+	   this is what is in the conntrack, except for prior
+	   manipulations (future optimization: if num_manips == 0,
+	   orig_tp =
+	   conntrack->tuplehash[IP_CT_DIR_ORIGINAL].tuple) */
+	invert_tuplepr(&orig_tp,
+		       &conntrack->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+#if 0
+	{
+	unsigned int i;
+
+	DEBUGP("Hook %u (%s), ", hooknum,
+	       HOOK2MANIP(hooknum)==IP_NAT_MANIP_SRC ? "SRC" : "DST");
+	DUMP_TUPLE(&orig_tp);
+	DEBUGP("Range %p: ", mr);
+	for (i = 0; i < mr->rangesize; i++) {
+		DEBUGP("%u:%s%s%s %u.%u.%u.%u - %u.%u.%u.%u %u - %u\n",
+		       i,
+		       (mr->range[i].flags & IP_NAT_RANGE_MAP_IPS)
+		       ? " MAP_IPS" : "",
+		       (mr->range[i].flags
+			& IP_NAT_RANGE_PROTO_SPECIFIED)
+		       ? " PROTO_SPECIFIED" : "",
+		       (mr->range[i].flags & IP_NAT_RANGE_FULL)
+		       ? " FULL" : "",
+		       NIPQUAD(mr->range[i].min_ip),
+		       NIPQUAD(mr->range[i].max_ip),
+		       mr->range[i].min.all,
+		       mr->range[i].max.all);
+	}
+	}
+#endif
+
+	do {
+		if (!get_unique_tuple(&new_tuple, &orig_tp, mr, conntrack,
+				      hooknum)) {
+			DEBUGP("ip_nat_setup_info: Can't get unique for %p.\n",
+			       conntrack);
+			return NF_DROP;
+		}
+
+#if 0
+		DEBUGP("Hook %u (%s) %p\n", hooknum,
+		       HOOK2MANIP(hooknum)==IP_NAT_MANIP_SRC ? "SRC" : "DST",
+		       conntrack);
+		DEBUGP("Original: ");
+		DUMP_TUPLE(&orig_tp);
+		DEBUGP("New: ");
+		DUMP_TUPLE(&new_tuple);
+#endif
+
+		/* We now have two tuples (SRCIP/SRCPT/DSTIP/DSTPT):
+		   the original (A/B/C/D') and the mangled one (E/F/G/H').
+
+		   We're only allowed to work with the SRC per-proto
+		   part, so we create inverses of both to start, then
+		   derive the other fields we need.  */
+
+		/* Reply connection: simply invert the new tuple
+                   (G/H/E/F') */
+		invert_tuplepr(&reply, &new_tuple);
+
+		/* Alter conntrack table so it recognizes replies.
+                   If fail this race (reply tuple now used), repeat. */
+	} while (!ip_conntrack_alter_reply(conntrack, &reply));
+
+	/* FIXME: We can simply used existing conntrack reply tuple
+           here --RR */
+	/* Create inverse of original: C/D/A/B' */
+	invert_tuplepr(&inv_tuple, &orig_tp);
+
+	/* Has source changed?. */
+	if (!ip_ct_tuple_src_equal(&new_tuple, &orig_tp)) {
+		/* In this direction, a source manip. */
+		info->manips[info->num_manips++] =
+			((struct ip_nat_info_manip)
+			 { IP_CT_DIR_ORIGINAL, hooknum,
+			   IP_NAT_MANIP_SRC, new_tuple.src });
+
+		IP_NF_ASSERT(info->num_manips < IP_NAT_MAX_MANIPS);
+
+		/* In the reverse direction, a destination manip. */
+		info->manips[info->num_manips++] =
+			((struct ip_nat_info_manip)
+			 { IP_CT_DIR_REPLY, opposite_hook[hooknum],
+			   IP_NAT_MANIP_DST, orig_tp.src });
+		IP_NF_ASSERT(info->num_manips <= IP_NAT_MAX_MANIPS);
+	}
+
+	/* Has destination changed? */
+	if (!ip_ct_tuple_dst_equal(&new_tuple, &orig_tp)) {
+		/* In this direction, a destination manip */
+		info->manips[info->num_manips++] =
+			((struct ip_nat_info_manip)
+			 { IP_CT_DIR_ORIGINAL, hooknum,
+			   IP_NAT_MANIP_DST, reply.src });
+
+		IP_NF_ASSERT(info->num_manips < IP_NAT_MAX_MANIPS);
+
+		/* In the reverse direction, a source manip. */
+		info->manips[info->num_manips++] =
+			((struct ip_nat_info_manip)
+			 { IP_CT_DIR_REPLY, opposite_hook[hooknum],
+			   IP_NAT_MANIP_SRC, inv_tuple.src });
+		IP_NF_ASSERT(info->num_manips <= IP_NAT_MAX_MANIPS);
+	}
+
+	/* If there's a helper, assign it; based on new tuple. */
+	if (!conntrack->master)
+		info->helper = LIST_FIND(&helpers, helper_cmp, struct ip_nat_helper *,
+					 &reply);
+
+	/* It's done. */
+	info->initialized |= (1 << HOOK2MANIP(hooknum));
+
+	if (in_hashes) {
+		IP_NF_ASSERT(info->bysource.conntrack);
+		replace_in_hashes(conntrack, info);
+	} else {
+		place_in_hashes(conntrack, info);
+	}
+
+	return NF_ACCEPT;
+}
+
+void replace_in_hashes(struct ip_conntrack *conntrack,
+		       struct ip_nat_info *info)
+{
+	/* Source has changed, so replace in hashes. */
+	unsigned int srchash
+		= hash_by_src(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
+			      .tuple.src,
+			      conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
+			      .tuple.dst.protonum);
+	/* We place packet as seen OUTGOUNG in byips_proto hash
+           (ie. reverse dst and src of reply packet. */
+	unsigned int ipsprotohash
+		= hash_by_ipsproto(conntrack->tuplehash[IP_CT_DIR_REPLY]
+				   .tuple.dst.ip,
+				   conntrack->tuplehash[IP_CT_DIR_REPLY]
+				   .tuple.src.ip,
+				   conntrack->tuplehash[IP_CT_DIR_REPLY]
+				   .tuple.dst.protonum);
+
+	IP_NF_ASSERT(info->bysource.conntrack == conntrack);
+	MUST_BE_WRITE_LOCKED(&ip_nat_lock);
+
+	list_del(&info->bysource.list);
+	list_del(&info->byipsproto.list);
+
+	list_prepend(&bysource[srchash], &info->bysource);
+	list_prepend(&byipsproto[ipsprotohash], &info->byipsproto);
+}
+
+void place_in_hashes(struct ip_conntrack *conntrack,
+		     struct ip_nat_info *info)
+{
+	unsigned int srchash
+		= hash_by_src(&conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
+			      .tuple.src,
+			      conntrack->tuplehash[IP_CT_DIR_ORIGINAL]
+			      .tuple.dst.protonum);
+	/* We place packet as seen OUTGOUNG in byips_proto hash
+           (ie. reverse dst and src of reply packet. */
+	unsigned int ipsprotohash
+		= hash_by_ipsproto(conntrack->tuplehash[IP_CT_DIR_REPLY]
+				   .tuple.dst.ip,
+				   conntrack->tuplehash[IP_CT_DIR_REPLY]
+				   .tuple.src.ip,
+				   conntrack->tuplehash[IP_CT_DIR_REPLY]
+				   .tuple.dst.protonum);
+
+	IP_NF_ASSERT(!info->bysource.conntrack);
+
+	MUST_BE_WRITE_LOCKED(&ip_nat_lock);
+	info->byipsproto.conntrack = conntrack;
+	info->bysource.conntrack = conntrack;
+
+	list_prepend(&bysource[srchash], &info->bysource);
+	list_prepend(&byipsproto[ipsprotohash], &info->byipsproto);
+}
+
+static void
+manip_pkt(u_int16_t proto, struct iphdr *iph, size_t len,
+	  const struct ip_conntrack_manip *manip,
+	  enum ip_nat_manip_type maniptype,
+	  __u32 *nfcache)
+{
+	*nfcache |= NFC_ALTERED;
+	find_nat_proto(proto)->manip_pkt(iph, len, manip, maniptype);
+
+	if (maniptype == IP_NAT_MANIP_SRC) {
+		iph->check = ip_nat_cheat_check(~iph->saddr, manip->ip,
+						iph->check);
+		iph->saddr = manip->ip;
+	} else {
+		iph->check = ip_nat_cheat_check(~iph->daddr, manip->ip,
+						iph->check);
+		iph->daddr = manip->ip;
+	}
+#if 0
+	if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
+		DEBUGP("IP: checksum on packet bad.\n");
+
+	if (proto == IPPROTO_TCP) {
+		void *th = (u_int32_t *)iph + iph->ihl;
+		if (tcp_v4_check(th, len - 4*iph->ihl, iph->saddr, iph->daddr,
+				 csum_partial((char *)th, len-4*iph->ihl, 0)))
+			DEBUGP("TCP: checksum on packet bad\n");
+	}
+#endif
+}
+
+static inline int exp_for_packet(struct ip_conntrack_expect *exp,
+			         struct sk_buff **pskb)
+{
+	struct ip_conntrack_protocol *proto;
+	int ret = 1;
+
+	MUST_BE_READ_LOCKED(&ip_conntrack_lock);
+	proto = __ip_ct_find_proto((*pskb)->nh.iph->protocol);
+	if (proto->exp_matches_pkt)
+		ret = proto->exp_matches_pkt(exp, pskb);
+
+	return ret;
+}
+
+/* Do packet manipulations according to binding. */
+unsigned int
+do_bindings(struct ip_conntrack *ct,
+	    enum ip_conntrack_info ctinfo,
+	    struct ip_nat_info *info,
+	    unsigned int hooknum,
+	    struct sk_buff **pskb)
+{
+	unsigned int i;
+	struct ip_nat_helper *helper;
+	enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
+	int is_tcp = (*pskb)->nh.iph->protocol == IPPROTO_TCP;
+
+	/* Need nat lock to protect against modification, but neither
+	   conntrack (referenced) and helper (deleted with
+	   synchronize_bh()) can vanish. */
+	READ_LOCK(&ip_nat_lock);
+	for (i = 0; i < info->num_manips; i++) {
+		/* raw socket (tcpdump) may have clone of incoming
+                   skb: don't disturb it --RR */
+		if (skb_cloned(*pskb) && !(*pskb)->sk) {
+			struct sk_buff *nskb = skb_copy(*pskb, GFP_ATOMIC);
+			if (!nskb) {
+				READ_UNLOCK(&ip_nat_lock);
+				return NF_DROP;
+			}
+			kfree_skb(*pskb);
+			*pskb = nskb;
+		}
+
+		if (info->manips[i].direction == dir
+		    && info->manips[i].hooknum == hooknum) {
+			DEBUGP("Mangling %p: %s to %u.%u.%u.%u %u\n",
+			       *pskb,
+			       info->manips[i].maniptype == IP_NAT_MANIP_SRC
+			       ? "SRC" : "DST",
+			       NIPQUAD(info->manips[i].manip.ip),
+			       htons(info->manips[i].manip.u.all));
+			manip_pkt((*pskb)->nh.iph->protocol,
+				  (*pskb)->nh.iph,
+				  (*pskb)->len,
+				  &info->manips[i].manip,
+				  info->manips[i].maniptype,
+				  &(*pskb)->nfcache);
+		}
+	}
+	helper = info->helper;
+	READ_UNLOCK(&ip_nat_lock);
+
+	if (helper) {
+		struct ip_conntrack_expect *exp = NULL;
+		struct list_head *cur_item;
+		int ret = NF_ACCEPT;
+		int helper_called = 0;
+
+		DEBUGP("do_bindings: helper existing for (%p)\n", ct);
+
+		/* Always defragged for helpers */
+		IP_NF_ASSERT(!((*pskb)->nh.iph->frag_off
+			       & htons(IP_MF|IP_OFFSET)));
+
+		/* Have to grab read lock before sibling_list traversal */
+		READ_LOCK(&ip_conntrack_lock);
+		list_for_each_prev(cur_item, &ct->sibling_list) { 
+			exp = list_entry(cur_item, struct ip_conntrack_expect, 
+					 expected_list);
+					 
+			/* if this expectation is already established, skip */
+			if (exp->sibling)
+				continue;
+
+			if (exp_for_packet(exp, pskb)) {
+				/* FIXME: May be true multiple times in the
+				 * case of UDP!! */
+				DEBUGP("calling nat helper (exp=%p) for	packet\n", exp);
+				ret = helper->help(ct, exp, info, ctinfo, 
+						   hooknum, pskb);
+				if (ret != NF_ACCEPT) {
+					READ_UNLOCK(&ip_conntrack_lock);
+					return ret;
+				}
+				helper_called = 1;
+			}
+		}
+		/* Helper might want to manip the packet even when there is no
+		 * matching expectation for this packet */
+		if (!helper_called && helper->flags & IP_NAT_HELPER_F_ALWAYS) {
+			DEBUGP("calling nat helper for packet without expectation\n");
+			ret = helper->help(ct, NULL, info, ctinfo, 
+					   hooknum, pskb);
+			if (ret != NF_ACCEPT) {
+				READ_UNLOCK(&ip_conntrack_lock);
+				return ret;
+			}
+		}
+		READ_UNLOCK(&ip_conntrack_lock);
+		
+		/* Adjust sequence number only once per packet 
+		 * (helper is called at all hooks) */
+		if (is_tcp && (hooknum == NF_IP_POST_ROUTING
+			       || hooknum == NF_IP_LOCAL_IN)) {
+			DEBUGP("ip_nat_core: adjusting sequence number\n");
+			/* future: put this in a l4-proto specific function,
+			 * and call this function here. */
+			ip_nat_seq_adjust(*pskb, ct, ctinfo);
+		}
+
+		return ret;
+
+	} else 
+		return NF_ACCEPT;
+
+	/* not reached */
+}
+
+unsigned int
+icmp_reply_translation(struct sk_buff *skb,
+		       struct ip_conntrack *conntrack,
+		       unsigned int hooknum,
+		       int dir)
+{
+	struct iphdr *iph = skb->nh.iph;
+	struct icmphdr *hdr = (struct icmphdr *)((u_int32_t *)iph + iph->ihl);
+	struct iphdr *inner = (struct iphdr *)(hdr + 1);
+	size_t datalen = skb->len - ((void *)inner - (void *)iph);
+	unsigned int i;
+	struct ip_nat_info *info = &conntrack->nat.info;
+
+	IP_NF_ASSERT(skb->len >= iph->ihl*4 + sizeof(struct icmphdr));
+	/* Must be RELATED */
+	IP_NF_ASSERT(skb->nfct
+		     - ((struct ip_conntrack *)skb->nfct->master)->infos
+		     == IP_CT_RELATED
+		     || skb->nfct
+		     - ((struct ip_conntrack *)skb->nfct->master)->infos
+		     == IP_CT_RELATED+IP_CT_IS_REPLY);
+
+	/* Redirects on non-null nats must be dropped, else they'll
+           start talking to each other without our translation, and be
+           confused... --RR */
+	if (hdr->type == ICMP_REDIRECT) {
+		/* Don't care about races here. */
+		if (info->initialized
+		    != ((1 << IP_NAT_MANIP_SRC) | (1 << IP_NAT_MANIP_DST))
+		    || info->num_manips != 0)
+			return NF_DROP;
+	}
+
+	DEBUGP("icmp_reply_translation: translating error %p hook %u dir %s\n",
+	       skb, hooknum, dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY");
+	/* Note: May not be from a NAT'd host, but probably safest to
+	   do translation always as if it came from the host itself
+	   (even though a "host unreachable" coming from the host
+	   itself is a bit weird).
+
+	   More explanation: some people use NAT for anonymizing.
+	   Also, CERT recommends dropping all packets from private IP
+	   addresses (although ICMP errors from internal links with
+	   such addresses are not too uncommon, as Alan Cox points
+	   out) */
+
+	READ_LOCK(&ip_nat_lock);
+	for (i = 0; i < info->num_manips; i++) {
+		DEBUGP("icmp_reply: manip %u dir %s hook %u\n",
+		       i, info->manips[i].direction == IP_CT_DIR_ORIGINAL ?
+		       "ORIG" : "REPLY", info->manips[i].hooknum);
+
+		if (info->manips[i].direction != dir)
+			continue;
+
+		/* Mapping the inner packet is just like a normal
+		   packet, except it was never src/dst reversed, so
+		   where we would normally apply a dst manip, we apply
+		   a src, and vice versa. */
+		if (info->manips[i].hooknum == hooknum) {
+			DEBUGP("icmp_reply: inner %s -> %u.%u.%u.%u %u\n",
+			       info->manips[i].maniptype == IP_NAT_MANIP_SRC
+			       ? "DST" : "SRC",
+			       NIPQUAD(info->manips[i].manip.ip),
+			       ntohs(info->manips[i].manip.u.udp.port));
+			manip_pkt(inner->protocol, inner,
+				  skb->len - ((void *)inner - (void *)iph),
+				  &info->manips[i].manip,
+				  !info->manips[i].maniptype,
+				  &skb->nfcache);
+			/* Outer packet needs to have IP header NATed like
+	                   it's a reply. */
+
+			/* Use mapping to map outer packet: 0 give no
+                           per-proto mapping */
+			DEBUGP("icmp_reply: outer %s -> %u.%u.%u.%u\n",
+			       info->manips[i].maniptype == IP_NAT_MANIP_SRC
+			       ? "SRC" : "DST",
+			       NIPQUAD(info->manips[i].manip.ip));
+			manip_pkt(0, iph, skb->len,
+				  &info->manips[i].manip,
+				  info->manips[i].maniptype,
+				  &skb->nfcache);
+		}
+	}
+	READ_UNLOCK(&ip_nat_lock);
+
+	/* Since we mangled inside ICMP packet, recalculate its
+	   checksum from scratch.  (Hence the handling of incorrect
+	   checksums in conntrack, so we don't accidentally fix one.)  */
+	hdr->checksum = 0;
+	hdr->checksum = ip_compute_csum((unsigned char *)hdr,
+					sizeof(*hdr) + datalen);
+
+	return NF_ACCEPT;
+}
+
+int __init ip_nat_init(void)
+{
+	size_t i;
+
+	/* Leave them the same for the moment. */
+	ip_nat_htable_size = ip_conntrack_htable_size;
+
+	/* One vmalloc for both hash tables */
+	bysource = vmalloc(sizeof(struct list_head) * ip_nat_htable_size*2);
+	if (!bysource) {
+		return -ENOMEM;
+	}
+	byipsproto = bysource + ip_nat_htable_size;
+
+	/* Sew in builtin protocols. */
+	WRITE_LOCK(&ip_nat_lock);
+	list_append(&protos, &ip_nat_protocol_tcp);
+	list_append(&protos, &ip_nat_protocol_udp);
+	list_append(&protos, &ip_nat_protocol_icmp);
+	WRITE_UNLOCK(&ip_nat_lock);
+
+	for (i = 0; i < ip_nat_htable_size; i++) {
+		INIT_LIST_HEAD(&bysource[i]);
+		INIT_LIST_HEAD(&byipsproto[i]);
+	}
+
+	/* FIXME: Man, this is a hack.  <SIGH> */
+	IP_NF_ASSERT(ip_conntrack_destroyed == NULL);
+	ip_conntrack_destroyed = &ip_nat_cleanup_conntrack;
+
+	return 0;
+}
+
+/* Clear NAT section of all conntracks, in case we're loaded again. */
+static int clean_nat(const struct ip_conntrack *i, void *data)
+{
+	memset((void *)&i->nat, 0, sizeof(i->nat));
+	return 0;
+}
+
+/* Not __exit: called from ip_nat_standalone.c:init_or_cleanup() --RR */
+void ip_nat_cleanup(void)
+{
+	ip_ct_selective_cleanup(&clean_nat, NULL);
+	ip_conntrack_destroyed = NULL;
+	vfree(bysource);
+}
diff -uNr linux_org/net/ipv4/netfilter/ip_nat_pptp.c linux/net/ipv4/netfilter/ip_nat_pptp.c
--- linux_org/net/ipv4/netfilter/ip_nat_pptp.c	1970-01-01 01:00:00.000000000 +0100
+++ linux/net/ipv4/netfilter/ip_nat_pptp.c	2006-10-27 14:11:52.000000000 +0200
@@ -0,0 +1,475 @@
+/*
+ * ip_nat_pptp.c	- Version 1.5
+ *
+ * NAT support for PPTP (Point to Point Tunneling Protocol).
+ * PPTP is a a protocol for creating virtual private networks.
+ * It is a specification defined by Microsoft and some vendors
+ * working with Microsoft.  PPTP is built on top of a modified
+ * version of the Internet Generic Routing Encapsulation Protocol.
+ * GRE is defined in RFC 1701 and RFC 1702.  Documentation of
+ * PPTP can be found in RFC 2637
+ *
+ * (C) 2000-2003 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ *
+ * TODO: - Support for multiple calls within one session
+ * 	   (needs netfilter newnat code)
+ * 	 - NAT to a unique tuple, not to TCP source port
+ * 	   (needs netfilter tuple reservation)
+ *
+ * Changes:
+ *     2002-02-10 - Version 1.3
+ *       - Use ip_nat_mangle_tcp_packet() because of cloned skb's
+ *	   in local connections (Philip Craig <philipc@snapgear.com>)
+ *       - add checks for magicCookie and pptp version
+ *       - make argument list of pptp_{out,in}bound_packet() shorter
+ *       - move to C99 style initializers
+ *       - print version number at module loadtime
+ *     2003-09-22 - Version 1.5
+ *       - use SNATed tcp sourceport as callid, since we get called before
+ *         TCP header is mangled (Philip Craig <philipc@snapgear.com>)
+ * 
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <net/tcp.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_nat_helper.h>
+#include <linux/netfilter_ipv4/ip_nat_pptp.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
+#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
+
+#define IP_NAT_PPTP_VERSION "1.5"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("Netfilter NAT helper module for PPTP");
+
+
+#if 0
+#include "ip_conntrack_pptp_priv.h"
+#define DEBUGP(format, args...) printk(KERN_DEBUG __FILE__ ":" __FUNCTION__ \
+				       ": " format, ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+static unsigned int
+pptp_nat_expected(struct sk_buff **pskb,
+		  unsigned int hooknum,
+		  struct ip_conntrack *ct,
+		  struct ip_nat_info *info)
+{
+	struct ip_conntrack *master = master_ct(ct);
+	struct ip_nat_multi_range mr;
+	struct ip_ct_pptp_master *ct_pptp_info;
+	struct ip_nat_pptp *nat_pptp_info;
+	u_int32_t newip, newcid;
+	int ret;
+
+	IP_NF_ASSERT(info);
+	IP_NF_ASSERT(master);
+	IP_NF_ASSERT(!(info->initialized & (1 << HOOK2MANIP(hooknum))));
+
+	DEBUGP("we have a connection!\n");
+
+	LOCK_BH(&ip_pptp_lock);
+	ct_pptp_info = &master->help.ct_pptp_info;
+	nat_pptp_info = &master->nat.help.nat_pptp_info;
+
+	/* need to alter GRE tuple because conntrack expectfn() used 'wrong'
+	 * (unmanipulated) values */
+	if (HOOK2MANIP(hooknum) == IP_NAT_MANIP_DST) {
+		DEBUGP("completing tuples with NAT info \n");
+		/* we can do this, since we're unconfirmed */
+		if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u.gre.key ==
+			htonl(ct_pptp_info->pac_call_id)) {	
+			/* assume PNS->PAC */
+			ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.gre.key =
+				htonl(nat_pptp_info->pns_call_id);
+			ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.gre.key =
+				htonl(nat_pptp_info->pns_call_id);
+			newip = master->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip;
+			newcid = htonl(nat_pptp_info->pac_call_id);
+		} else {
+			/* assume PAC->PNS */
+			ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.gre.key =
+				htonl(nat_pptp_info->pac_call_id);
+			ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.gre.key =
+				htonl(nat_pptp_info->pac_call_id);
+			newip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
+			newcid = htonl(nat_pptp_info->pns_call_id);
+		}
+	} else {
+		if (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u.gre.key ==
+			htonl(ct_pptp_info->pac_call_id)) {	
+			/* assume PNS->PAC */
+			newip = master->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
+			newcid = htonl(ct_pptp_info->pns_call_id);
+		}
+		else {
+			/* assume PAC->PNS */
+			newip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip;
+			newcid = htonl(ct_pptp_info->pac_call_id);
+		}
+	}
+
+	mr.rangesize = 1;
+	mr.range[0].flags = IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED;
+	mr.range[0].min_ip = mr.range[0].max_ip = newip;
+	mr.range[0].min = mr.range[0].max = 
+		((union ip_conntrack_manip_proto ) { newcid }); 
+	DEBUGP("change ip to %u.%u.%u.%u\n", 
+		NIPQUAD(newip));
+	DEBUGP("change key to 0x%x\n", ntohl(newcid));
+	ret = ip_nat_setup_info(ct, &mr, hooknum);
+
+	UNLOCK_BH(&ip_pptp_lock);
+
+	return ret;
+
+}
+
+/* outbound packets == from PNS to PAC */
+static inline unsigned int
+pptp_outbound_pkt(struct sk_buff **pskb,
+		  struct ip_conntrack *ct,
+		  enum ip_conntrack_info ctinfo,
+		  struct ip_conntrack_expect *exp)
+
+{
+	struct iphdr *iph = (*pskb)->nh.iph;
+	struct tcphdr *tcph = (void *) iph + iph->ihl*4;
+	struct pptp_pkt_hdr *pptph = (struct pptp_pkt_hdr *) 
+					((void *)tcph + tcph->doff*4);
+
+	struct PptpControlHeader *ctlh;
+	union pptp_ctrl_union pptpReq;
+	struct ip_ct_pptp_master *ct_pptp_info = &ct->help.ct_pptp_info;
+	struct ip_nat_pptp *nat_pptp_info = &ct->nat.help.nat_pptp_info;
+
+	u_int16_t msg, *cid = NULL, new_callid;
+
+	/* FIXME: size checks !!! */
+	ctlh = (struct PptpControlHeader *) ((void *) pptph + sizeof(*pptph));
+	pptpReq.rawreq = (void *) ((void *) ctlh + sizeof(*ctlh));
+
+	new_callid = htons(ct_pptp_info->pns_call_id);
+	
+	switch (msg = ntohs(ctlh->messageType)) {
+		case PPTP_OUT_CALL_REQUEST:
+			cid = &pptpReq.ocreq->callID;
+			/* FIXME: ideally we would want to reserve a call ID
+			 * here.  current netfilter NAT core is not able to do
+			 * this :( For now we use TCP source port. This breaks
+			 * multiple calls within one control session */
+
+			/* save original call ID in nat_info */
+			nat_pptp_info->pns_call_id = ct_pptp_info->pns_call_id;
+
+			/* don't use tcph->source since we are at a DSTmanip
+			 * hook (e.g. PREROUTING) and pkt is not mangled yet */
+			new_callid = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u.tcp.port;
+
+			/* save new call ID in ct info */
+			ct_pptp_info->pns_call_id = ntohs(new_callid);
+			break;
+		case PPTP_IN_CALL_REPLY:
+			cid = &pptpReq.icreq->callID;
+			break;
+		case PPTP_CALL_CLEAR_REQUEST:
+			cid = &pptpReq.clrreq->callID;
+			break;
+		default:
+			DEBUGP("unknown outbound packet 0x%04x:%s\n", msg,
+			      (msg <= PPTP_MSG_MAX)? strMName[msg]:strMName[0]);
+			/* fall through */
+
+		case PPTP_SET_LINK_INFO:
+			/* only need to NAT in case PAC is behind NAT box */
+		case PPTP_START_SESSION_REQUEST:
+		case PPTP_START_SESSION_REPLY:
+		case PPTP_STOP_SESSION_REQUEST:
+		case PPTP_STOP_SESSION_REPLY:
+		case PPTP_ECHO_REQUEST:
+		case PPTP_ECHO_REPLY:
+			/* no need to alter packet */
+			return NF_ACCEPT;
+	}
+
+	IP_NF_ASSERT(cid);
+
+	DEBUGP("altering call id from 0x%04x to 0x%04x\n",
+		ntohs(*cid), ntohs(new_callid));
+
+	/* mangle packet */
+	ip_nat_mangle_tcp_packet(pskb, ct, ctinfo, (void *)cid - (void *)pptph,
+				 sizeof(new_callid), (char *)&new_callid,
+				 sizeof(new_callid));
+
+	return NF_ACCEPT;
+}
+
+/* inbound packets == from PAC to PNS */
+static inline unsigned int
+pptp_inbound_pkt(struct sk_buff **pskb,
+		 struct ip_conntrack *ct,
+		 enum ip_conntrack_info ctinfo,
+		 struct ip_conntrack_expect *oldexp)
+{
+	struct iphdr *iph = (*pskb)->nh.iph;
+	struct tcphdr *tcph = (void *) iph + iph->ihl*4;
+	struct pptp_pkt_hdr *pptph = (struct pptp_pkt_hdr *) 
+					((void *)tcph + tcph->doff*4);
+
+	struct PptpControlHeader *ctlh;
+	union pptp_ctrl_union pptpReq;
+	struct ip_ct_pptp_master *ct_pptp_info = &ct->help.ct_pptp_info;
+	struct ip_nat_pptp *nat_pptp_info = &ct->nat.help.nat_pptp_info;
+
+	u_int16_t msg, new_cid = 0, new_pcid, *pcid = NULL, *cid = NULL;
+	u_int32_t old_dst_ip;
+
+	struct ip_conntrack_tuple t, inv_t;
+	struct ip_conntrack_tuple *orig_t, *reply_t;
+
+	/* FIXME: size checks !!! */
+	ctlh = (struct PptpControlHeader *) ((void *) pptph + sizeof(*pptph));
+	pptpReq.rawreq = (void *) ((void *) ctlh + sizeof(*ctlh));
+
+	new_pcid = htons(nat_pptp_info->pns_call_id);
+
+	switch (msg = ntohs(ctlh->messageType)) {
+	case PPTP_OUT_CALL_REPLY:
+		pcid = &pptpReq.ocack->peersCallID;	
+		cid = &pptpReq.ocack->callID;
+		if (!oldexp) {
+			DEBUGP("outcall but no expectation\n");
+			break;
+		}
+		old_dst_ip = oldexp->tuple.dst.ip;
+		t = oldexp->tuple;
+		invert_tuplepr(&inv_t, &t);
+
+		/* save original PAC call ID in nat_info */
+		nat_pptp_info->pac_call_id = ct_pptp_info->pac_call_id;
+
+		/* alter expectation */
+		orig_t = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+		reply_t = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+		if (t.src.ip == orig_t->src.ip && t.dst.ip == orig_t->dst.ip) {
+			/* expectation for PNS->PAC direction */
+			t.src.u.gre.key = htonl(nat_pptp_info->pns_call_id);
+			t.dst.u.gre.key = htonl(ct_pptp_info->pac_call_id);
+			inv_t.src.ip = reply_t->src.ip;
+			inv_t.dst.ip = reply_t->dst.ip;
+			inv_t.src.u.gre.key = htonl(nat_pptp_info->pac_call_id);
+			inv_t.dst.u.gre.key = htonl(ct_pptp_info->pns_call_id);
+		} else {
+			/* expectation for PAC->PNS direction */
+			t.src.u.gre.key = htonl(nat_pptp_info->pac_call_id);
+			t.dst.u.gre.key = htonl(ct_pptp_info->pns_call_id);
+			inv_t.src.ip = orig_t->src.ip;
+			inv_t.dst.ip = orig_t->dst.ip;
+			inv_t.src.u.gre.key = htonl(nat_pptp_info->pns_call_id);
+			inv_t.dst.u.gre.key = htonl(ct_pptp_info->pac_call_id);
+		}
+
+		if (!ip_conntrack_change_expect(oldexp, &t)) {
+			DEBUGP("successfully changed expect\n");
+		} else {
+			DEBUGP("can't change expect\n");
+		}
+		ip_ct_gre_keymap_change(oldexp->proto.gre.keymap_orig, &t);
+		ip_ct_gre_keymap_change(oldexp->proto.gre.keymap_reply, &inv_t);
+		break;
+	case PPTP_IN_CALL_CONNECT:
+		pcid = &pptpReq.iccon->peersCallID;
+		if (!oldexp)
+			break;
+		old_dst_ip = oldexp->tuple.dst.ip;
+		t = oldexp->tuple;
+
+		/* alter expectation, no need for callID */
+		if (t.dst.ip == ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip) {
+			/* expectation for PNS->PAC direction */
+			t.src.ip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
+		} else {
+			/* expectation for PAC->PNS direction */
+			t.dst.ip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
+		}
+
+		if (!ip_conntrack_change_expect(oldexp, &t)) {
+			DEBUGP("successfully changed expect\n");
+		} else {
+			DEBUGP("can't change expect\n");
+		}
+		break;
+	case PPTP_IN_CALL_REQUEST:
+		/* only need to nat in case PAC is behind NAT box */
+		break;
+	case PPTP_WAN_ERROR_NOTIFY:
+		pcid = &pptpReq.wanerr->peersCallID;
+		break;
+	case PPTP_CALL_DISCONNECT_NOTIFY:
+		pcid = &pptpReq.disc->callID;
+		break;
+
+	default:
+		DEBUGP("unknown inbound packet %s\n",
+			(msg <= PPTP_MSG_MAX)? strMName[msg]:strMName[0]);
+		/* fall through */
+
+	case PPTP_START_SESSION_REQUEST:
+	case PPTP_START_SESSION_REPLY:
+	case PPTP_STOP_SESSION_REQUEST:
+	case PPTP_STOP_SESSION_REPLY:
+	case PPTP_ECHO_REQUEST:
+	case PPTP_ECHO_REPLY:
+		/* no need to alter packet */
+		return NF_ACCEPT;
+	}
+
+	/* mangle packet */
+	IP_NF_ASSERT(pcid);
+	DEBUGP("altering peer call id from 0x%04x to 0x%04x\n",
+		ntohs(*pcid), ntohs(new_pcid));
+	ip_nat_mangle_tcp_packet(pskb, ct, ctinfo, (void *)pcid - (void *)pptph,
+				 sizeof(new_pcid), (char *)&new_pcid, 
+				 sizeof(new_pcid));
+
+	if (new_cid) {
+		IP_NF_ASSERT(cid);
+		DEBUGP("altering call id from 0x%04x to 0x%04x\n",
+			ntohs(*cid), ntohs(new_cid));
+		ip_nat_mangle_tcp_packet(pskb, ct, ctinfo, 
+					 (void *)cid - (void *)pptph, 
+					 sizeof(new_cid), (char *)&new_cid, 
+					 sizeof(new_cid));
+	}
+
+	/* great, at least we don't need to resize packets */
+	return NF_ACCEPT;
+}
+
+
+static unsigned int tcp_help(struct ip_conntrack *ct,
+			     struct ip_conntrack_expect *exp,
+			     struct ip_nat_info *info,
+			     enum ip_conntrack_info ctinfo,
+			     unsigned int hooknum, struct sk_buff **pskb)
+{
+	struct iphdr *iph = (*pskb)->nh.iph;
+	struct tcphdr *tcph = (void *) iph + iph->ihl*4;
+	unsigned int datalen = (*pskb)->len - iph->ihl*4 - tcph->doff*4;
+	struct pptp_pkt_hdr *pptph;
+
+	int dir;
+
+	DEBUGP("entering\n");
+
+	/* Only mangle things once: DST for original direction
+	   and SRC for reply direction. */
+	dir = CTINFO2DIR(ctinfo);
+	if (!((HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC
+	     && dir == IP_CT_DIR_ORIGINAL)
+	      || (HOOK2MANIP(hooknum) == IP_NAT_MANIP_DST
+		  && dir == IP_CT_DIR_REPLY))) {
+		DEBUGP("Not touching dir %s at hook %s\n",
+		       dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY",
+		       hooknum == NF_IP_POST_ROUTING ? "POSTROUTING"
+		       : hooknum == NF_IP_PRE_ROUTING ? "PREROUTING"
+		       : hooknum == NF_IP_LOCAL_OUT ? "OUTPUT"
+		       : hooknum == NF_IP_LOCAL_IN ? "INPUT" : "???");
+		return NF_ACCEPT;
+	}
+
+	/* if packet is too small, just skip it */
+	if (datalen < sizeof(struct pptp_pkt_hdr)+
+		      sizeof(struct PptpControlHeader)) {
+		DEBUGP("pptp packet too short\n");
+		return NF_ACCEPT;	
+	}
+
+	pptph = (struct pptp_pkt_hdr *) ((void *)tcph + tcph->doff*4);
+
+	/* if it's not a control message, we can't handle it */
+	if (ntohs(pptph->packetType) != PPTP_PACKET_CONTROL ||
+	    ntohl(pptph->magicCookie) != PPTP_MAGIC_COOKIE) {
+		DEBUGP("not a pptp control packet\n");
+		return NF_ACCEPT;
+	}
+
+	LOCK_BH(&ip_pptp_lock);
+
+	if (dir == IP_CT_DIR_ORIGINAL) {
+		/* reuqests sent by client to server (PNS->PAC) */
+		pptp_outbound_pkt(pskb, ct, ctinfo, exp);
+	} else {
+		/* response from the server to the client (PAC->PNS) */
+		pptp_inbound_pkt(pskb, ct, ctinfo, exp);
+	}
+
+	UNLOCK_BH(&ip_pptp_lock);
+
+	return NF_ACCEPT;
+}
+
+/* nat helper struct for control connection */
+static struct ip_nat_helper pptp_tcp_helper = { 
+	.list = { NULL, NULL },
+	.name = "pptp", 
+	.flags = IP_NAT_HELPER_F_ALWAYS, 
+	.me = THIS_MODULE,
+	.tuple = { .src = { .ip = 0, 
+			    .u = { .tcp = { .port = 
+				    	__constant_htons(PPTP_CONTROL_PORT) } 
+				 } 
+			  },
+	  	   .dst = { .ip = 0, 
+			    .u = { .all = 0 }, 
+			    .protonum = IPPROTO_TCP 
+		   	  } 
+		 },
+
+	.mask = { .src = { .ip = 0, 
+			   .u = { .tcp = { .port = 0xFFFF } } 
+			 },
+		  .dst = { .ip = 0, 
+			   .u = { .all = 0 }, 
+			   .protonum = 0xFFFF 
+		  	 } 
+		},
+	.help = tcp_help, 
+	.expect = pptp_nat_expected 
+};
+
+			  
+static int __init init(void)
+{
+	DEBUGP("%s: registering NAT helper\n", __FILE__);
+	if (ip_nat_helper_register(&pptp_tcp_helper)) {
+		printk(KERN_ERR "Unable to register NAT application helper "
+				"for pptp\n");
+		return -EIO;
+	}
+
+	printk("ip_nat_pptp version %s loaded\n", IP_NAT_PPTP_VERSION);
+	return 0;
+}
+
+static void __exit fini(void)
+{
+	DEBUGP("cleanup_module\n" );
+	ip_nat_helper_unregister(&pptp_tcp_helper);
+	printk("ip_nat_pptp version %s unloaded\n", IP_NAT_PPTP_VERSION);
+}
+
+module_init(init);
+module_exit(fini);
diff -uNr linux_org/net/ipv4/netfilter/ip_nat_proto_gre.c linux/net/ipv4/netfilter/ip_nat_proto_gre.c
--- linux_org/net/ipv4/netfilter/ip_nat_proto_gre.c	1970-01-01 01:00:00.000000000 +0100
+++ linux/net/ipv4/netfilter/ip_nat_proto_gre.c	2006-10-27 14:11:52.000000000 +0200
@@ -0,0 +1,225 @@
+/*
+ * ip_nat_proto_gre.c - Version 1.2
+ *
+ * NAT protocol helper module for GRE.
+ *
+ * GRE is a generic encapsulation protocol, which is generally not very
+ * suited for NAT, as it has no protocol-specific part as port numbers.
+ *
+ * It has an optional key field, which may help us distinguishing two 
+ * connections between the same two hosts.
+ *
+ * GRE is defined in RFC 1701 and RFC 1702, as well as RFC 2784 
+ *
+ * PPTP is built on top of a modified version of GRE, and has a mandatory
+ * field called "CallID", which serves us for the same purpose as the key
+ * field in plain GRE.
+ *
+ * Documentation about PPTP can be found in RFC 2637
+ *
+ * (C) 2000-2003 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/ip.h>
+#include <linux/netfilter_ipv4/ip_nat.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_nat_protocol.h>
+#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
+MODULE_DESCRIPTION("Netfilter NAT protocol helper module for GRE");
+
+#if 0
+#define DEBUGP(format, args...) printk(KERN_DEBUG __FILE__ ":" __FUNCTION__ \
+				       ": " format, ## args)
+#else
+#define DEBUGP(x, args...)
+#endif
+
+/* is key in given range between min and max */
+static int
+gre_in_range(const struct ip_conntrack_tuple *tuple,
+	     enum ip_nat_manip_type maniptype,
+	     const union ip_conntrack_manip_proto *min,
+	     const union ip_conntrack_manip_proto *max)
+{
+	u_int32_t key;
+
+	if (maniptype == IP_NAT_MANIP_SRC)
+		key = tuple->src.u.gre.key;
+	else
+		key = tuple->dst.u.gre.key;
+
+	return ntohl(key) >= ntohl(min->gre.key)
+		&& ntohl(key) <= ntohl(max->gre.key);
+}
+
+/* generate unique tuple ... */
+static int 
+gre_unique_tuple(struct ip_conntrack_tuple *tuple,
+		 const struct ip_nat_range *range,
+		 enum ip_nat_manip_type maniptype,
+		 const struct ip_conntrack *conntrack)
+{
+	u_int32_t min, i, range_size;
+	u_int32_t key = 0, *keyptr;
+
+	if (maniptype == IP_NAT_MANIP_SRC)
+		keyptr = &tuple->src.u.gre.key;
+	else
+		keyptr = &tuple->dst.u.gre.key;
+
+	if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
+
+		switch (tuple->dst.u.gre.version) {
+		case 0:
+			DEBUGP("NATing GRE version 0 (ct=%p)\n",
+				conntrack);
+			min = 1;
+			range_size = 0xffffffff;
+			break;
+		case GRE_VERSION_PPTP:
+			DEBUGP("%p: NATing GRE PPTP\n", 
+				conntrack);
+			min = 1;
+			range_size = 0xffff;
+			break;
+		default:
+			printk(KERN_WARNING "nat_gre: unknown GRE version\n");
+			return 0;
+			break;
+		}
+
+	} else {
+		min = ntohl(range->min.gre.key);
+		range_size = ntohl(range->max.gre.key) - min + 1;
+	}
+
+	DEBUGP("min = %u, range_size = %u\n", min, range_size); 
+
+	for (i = 0; i < range_size; i++, key++) {
+		*keyptr = htonl(min + key % range_size);
+		if (!ip_nat_used_tuple(tuple, conntrack))
+			return 1;
+	}
+
+	DEBUGP("%p: no NAT mapping\n", conntrack);
+
+	return 0;
+}
+
+/* manipulate a GRE packet according to maniptype */
+static void 
+gre_manip_pkt(struct iphdr *iph, size_t len, 
+	      const struct ip_conntrack_manip *manip,
+	      enum ip_nat_manip_type maniptype)
+{
+	struct gre_hdr *greh = (struct gre_hdr *)((u_int32_t *)iph+iph->ihl);
+	struct gre_hdr_pptp *pgreh = (struct gre_hdr_pptp *) greh;
+
+	/* we only have destination manip of a packet, since 'source key' 
+	 * is not present in the packet itself */
+	if (maniptype == IP_NAT_MANIP_DST) {
+		/* key manipulation is always dest */
+		switch (greh->version) {
+		case 0:
+			if (!greh->key) {
+				DEBUGP("can't nat GRE w/o key\n");
+				break;
+			}
+			if (greh->csum) {
+				/* FIXME: Never tested this code... */
+				*(gre_csum(greh)) = 
+					ip_nat_cheat_check(~*(gre_key(greh)),
+							manip->u.gre.key,
+							*(gre_csum(greh)));
+			}
+			*(gre_key(greh)) = manip->u.gre.key;
+			break;
+		case GRE_VERSION_PPTP:
+			DEBUGP("call_id -> 0x%04x\n", 
+				ntohl(manip->u.gre.key));
+			pgreh->call_id = htons(ntohl(manip->u.gre.key));
+			break;
+		default:
+			DEBUGP("can't nat unknown GRE version\n");
+			break;
+		}
+	}
+}
+
+/* print out a nat tuple */
+static unsigned int 
+gre_print(char *buffer, 
+	  const struct ip_conntrack_tuple *match,
+	  const struct ip_conntrack_tuple *mask)
+{
+	unsigned int len = 0;
+
+	if (mask->dst.u.gre.version)
+		len += sprintf(buffer + len, "version=%d ",
+				ntohs(match->dst.u.gre.version));
+
+	if (mask->dst.u.gre.protocol)
+		len += sprintf(buffer + len, "protocol=0x%x ",
+				ntohs(match->dst.u.gre.protocol));
+
+	if (mask->src.u.gre.key)
+		len += sprintf(buffer + len, "srckey=0x%x ", 
+				ntohl(match->src.u.gre.key));
+
+	if (mask->dst.u.gre.key)
+		len += sprintf(buffer + len, "dstkey=0x%x ",
+				ntohl(match->src.u.gre.key));
+
+	return len;
+}
+
+/* print a range of keys */
+static unsigned int 
+gre_print_range(char *buffer, const struct ip_nat_range *range)
+{
+	if (range->min.gre.key != 0 
+	    || range->max.gre.key != 0xFFFF) {
+		if (range->min.gre.key == range->max.gre.key)
+			return sprintf(buffer, "key 0x%x ",
+					ntohl(range->min.gre.key));
+		else
+			return sprintf(buffer, "keys 0x%u-0x%u ",
+					ntohl(range->min.gre.key),
+					ntohl(range->max.gre.key));
+	} else
+		return 0;
+}
+
+/* nat helper struct */
+static struct ip_nat_protocol gre = 
+	{ { NULL, NULL }, "GRE", IPPROTO_GRE,
+	  gre_manip_pkt,
+	  gre_in_range,
+	  gre_unique_tuple,
+	  gre_print,
+	  gre_print_range 
+	};
+				  
+static int __init init(void)
+{
+        if (ip_nat_protocol_register(&gre))
+                return -EIO;
+
+        return 0;
+}
+
+static void __exit fini(void)
+{
+        ip_nat_protocol_unregister(&gre);
+}
+
+module_init(init);
+module_exit(fini);