summaryrefslogtreecommitdiffstats
path: root/sys/rpc/rpcclnt.c
blob: ba41a3c12405d45194b6a55c21cb7c0ff82cce9c (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
/* $FreeBSD$ */
/* $Id: rpcclnt.c,v 1.9 2003/11/05 14:59:03 rees Exp $ */

/*-
 * copyright (c) 2003
 * the regents of the university of michigan
 * all rights reserved
 * 
 * permission is granted to use, copy, create derivative works and redistribute
 * this software and such derivative works for any purpose, so long as the name
 * of the university of michigan is not used in any advertising or publicity
 * pertaining to the use or distribution of this software without specific,
 * written prior authorization.  if the above copyright notice or any other
 * identification of the university of michigan is included in any copy of any
 * portion of this software, then the disclaimer below must also be included.
 * 
 * this software is provided as is, without representation from the university
 * of michigan as to its fitness for any purpose, and without warranty by the
 * university of michigan of any kind, either express or implied, including
 * without limitation the implied warranties of merchantability and fitness for
 * a particular purpose. the regents of the university of michigan shall not be
 * liable for any damages, including special, indirect, incidental, or
 * consequential damages, with respect to any claim arising out of or in
 * connection with the use of the software, even if it has been or is hereafter
 * advised of the possibility of such damages.
 */

/*-
 * Copyright (c) 1989, 1991, 1993, 1995 The Regents of the University of
 * California.  All rights reserved.
 * 
 * This code is derived from software contributed to Berkeley by Rick Macklem at
 * The University of Guelph.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer. 2.
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution. 3. All advertising
 * materials mentioning features or use of this software must display the
 * following acknowledgement: This product includes software developed by the
 * University of California, Berkeley and its contributors. 4. Neither the
 * name of the University nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific
 * prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * @(#)nfs_socket.c	8.5 (Berkeley) 3/30/95
 */

/* XXX: kill ugly debug strings */
/* XXX: get rid of proct, as it is not even being used... (or keep it so v{2,3}
 *      can run, but clean it up! */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <sys/lock.h>
#include <sys/signalvar.h>
#include <sys/sysent.h>
#include <sys/syscall.h>
#include <sys/sysctl.h>

#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/mutex.h>

#include <netinet/in.h>
#include <netinet/tcp.h>

#include <nfs/rpcv2.h>

#include <rpc/rpcm_subs.h>
#include <rpc/rpcclnt.h>

/* memory management */
#ifdef __OpenBSD__
struct pool     rpctask_pool;
struct pool     rpcclnt_pool;
#define RPCTASKPOOL_LWM 10
#define RPCTASKPOOL_HWM 40
#else
static          MALLOC_DEFINE(M_RPC, "rpcclnt", "rpc state");
#endif

#define RPC_RETURN(X) do { RPCDEBUG("returning %d", X); return X; }while(0)

/*
 * Estimate rto for an nfs rpc sent via. an unreliable datagram. Use the mean
 * and mean deviation of rtt for the appropriate type of rpc for the frequent
 * rpcs and a default for the others. The justification for doing "other"
 * this way is that these rpcs happen so infrequently that timer est. would
 * probably be stale. Also, since many of these rpcs are non-idempotent, a
 * conservative timeout is desired. getattr, lookup - A+2D read, write     -
 * A+4D other           - nm_timeo
 */
#define	RPC_RTO(n, t) \
	((t) == 0 ? (n)->rc_timeo : \
	 ((t) < 3 ? \
	  (((((n)->rc_srtt[t-1] + 3) >> 2) + (n)->rc_sdrtt[t-1] + 1) >> 1) : \
	  ((((n)->rc_srtt[t-1] + 7) >> 3) + (n)->rc_sdrtt[t-1] + 1)))

#define	RPC_SRTT(s,r)	(r)->r_rpcclnt->rc_srtt[rpcclnt_proct((s),\
				(r)->r_procnum) - 1]

#define	RPC_SDRTT(s,r)	(r)->r_rpcclnt->rc_sdrtt[rpcclnt_proct((s),\
				(r)->r_procnum) - 1]


/*
 * There is a congestion window for outstanding rpcs maintained per mount
 * point. The cwnd size is adjusted in roughly the way that: Van Jacobson,
 * Congestion avoidance and Control, In "Proceedings of SIGCOMM '88". ACM,
 * August 1988. describes for TCP. The cwnd size is chopped in half on a
 * retransmit timeout and incremented by 1/cwnd when each rpc reply is
 * received and a full cwnd of rpcs is in progress. (The sent count and cwnd
 * are scaled for integer arith.) Variants of "slow start" were tried and
 * were found to be too much of a performance hit (ave. rtt 3 times larger),
 * I suspect due to the large rtt that nfs rpcs have.
 */
#define	RPC_CWNDSCALE	256
#define	RPC_MAXCWND	(RPC_CWNDSCALE * 32)
static const int      rpcclnt_backoff[8] = {2, 4, 8, 16, 32, 64, 128, 256,};

/* XXX ugly debug strings */
#define RPC_ERRSTR_ACCEPTED_SIZE 6
char *rpc_errstr_accepted[RPC_ERRSTR_ACCEPTED_SIZE] = {
	"",			/* no good message... */
	"remote server hasn't exported program.",
	"remote server can't support version number.",
	"program can't support procedure.",
	"procedure can't decode params.",
	"remote error.  remote side memory allocation failure?"
};

char *rpc_errstr_denied[2] = {
	"remote server doesnt support rpc version 2!",
	"remote server authentication error."
};

#define RPC_ERRSTR_AUTH_SIZE 6
char *rpc_errstr_auth[RPC_ERRSTR_AUTH_SIZE] = {
	"",
	"auth error: bad credential (seal broken).",
	"auth error: client must begin new session.",
	"auth error: bad verifier (seal broken).",
	"auth error: verifier expired or replayed.",
	"auth error: rejected for security reasons.",
};

/*
 * Static data, mostly RPC constants in XDR form
 */
static u_int32_t rpc_reply, rpc_call, rpc_vers;

/*
 * rpc_msgdenied, rpc_mismatch, rpc_auth_unix, rpc_msgaccepted,
 * rpc_autherr, rpc_auth_kerb;
 */

static u_int32_t rpcclnt_xid = 0;
static u_int32_t rpcclnt_xid_touched = 0;
struct rpcstats rpcstats;
int      rpcclnt_ticks;

SYSCTL_NODE(_kern, OID_AUTO, rpc, CTLFLAG_RD, 0, "RPC Subsystem");

SYSCTL_UINT(_kern_rpc, OID_AUTO, retries, CTLFLAG_RD, &rpcstats.rpcretries, 0, "retries");
SYSCTL_UINT(_kern_rpc, OID_AUTO, request, CTLFLAG_RD, &rpcstats.rpcrequests, 0, "request");
SYSCTL_UINT(_kern_rpc, OID_AUTO, timeouts, CTLFLAG_RD, &rpcstats.rpctimeouts, 0, "timeouts");
SYSCTL_UINT(_kern_rpc, OID_AUTO, unexpected, CTLFLAG_RD, &rpcstats.rpcunexpected, 0, "unexpected");
SYSCTL_UINT(_kern_rpc, OID_AUTO, invalid, CTLFLAG_RD, &rpcstats.rpcinvalid, 0, "invalid");


#ifdef RPCCLNT_DEBUG
int             rpcdebugon = 0;
SYSCTL_UINT(_kern_rpc, OID_AUTO, debug_on, CTLFLAG_RW, &rpcdebugon, 0, "RPC Debug messages");
#endif

/*
 * Queue head for rpctask's
 */
static 
TAILQ_HEAD(, rpctask) rpctask_q;
struct callout	rpcclnt_callout;

#ifdef __OpenBSD__
static int             rpcclnt_send(struct socket *, struct mbuf *, struct mbuf *, struct rpctask *);
static int             rpcclnt_receive(struct rpctask *, struct mbuf **, struct mbuf **, RPC_EXEC_CTX);
#else
static int             rpcclnt_send(struct socket *, struct sockaddr *, struct mbuf *, struct rpctask *);
static int             rpcclnt_receive(struct rpctask *, struct sockaddr **, struct mbuf **, RPC_EXEC_CTX);
#endif

static int             rpcclnt_msg(RPC_EXEC_CTX, const char *, char *);

static int             rpcclnt_reply(struct rpctask *, RPC_EXEC_CTX);
static void            rpcclnt_timer(void *);
static int             rpcclnt_sndlock(int *, struct rpctask *);
static void            rpcclnt_sndunlock(int *);
static int             rpcclnt_rcvlock(struct rpctask *);
static void            rpcclnt_rcvunlock(int *);
#if 0
void            rpcclnt_realign(struct mbuf *, int);
#else
static void	rpcclnt_realign(struct mbuf **, int);
#endif

static struct mbuf    *rpcclnt_buildheader(struct rpcclnt *, int, struct mbuf *, u_int32_t, int *, struct mbuf **, struct ucred *);
static int             rpcm_disct(struct mbuf **, caddr_t *, int, int, caddr_t *);
static u_int32_t       rpcclnt_proct(struct rpcclnt *, u_int32_t);
static int             rpc_adv(struct mbuf **, caddr_t *, int, int);
static void     rpcclnt_softterm(struct rpctask * task);

static int rpcauth_buildheader(struct rpc_auth * auth, struct ucred *, struct mbuf **, caddr_t *);

void
rpcclnt_init(void)
{
#ifdef __OpenBSD__
	static struct timeout rpcclnt_timer_to;
#endif

	rpcclnt_ticks = (hz * RPC_TICKINTVL + 500) / 1000;
	if (rpcclnt_ticks < 1)
		rpcclnt_ticks = 1;
	rpcstats.rpcretries = 0;
	rpcstats.rpcrequests = 0;
	rpcstats.rpctimeouts = 0;
	rpcstats.rpcunexpected = 0;
	rpcstats.rpcinvalid = 0;

	/*
	 * rpc constants how about actually using more than one of these!
	 */

	rpc_reply = txdr_unsigned(RPC_REPLY);
	rpc_vers = txdr_unsigned(RPC_VER2);
	rpc_call = txdr_unsigned(RPC_CALL);
#if 0
	rpc_msgdenied = txdr_unsigned(RPC_MSGDENIED);
	rpc_msgaccepted = txdr_unsigned(RPC_MSGACCEPTED);
	rpc_mismatch = txdr_unsigned(RPC_MISMATCH);
	rpc_autherr = txdr_unsigned(RPC_AUTHERR);
	rpc_auth_unix = txdr_unsigned(RPCAUTH_UNIX);
	rpc_auth_kerb = txdr_unsigned(RPCAUTH_KERB4);
#endif

	/* initialize rpctask queue */
	TAILQ_INIT(&rpctask_q);

#ifdef __OpenBSD__
	/* initialize pools */
	pool_init(&rpctask_pool, sizeof(struct rpctask), 0, 0, RPCTASKPOOL_LWM,
		  "rpctask_p", NULL);
	pool_setlowat(&rpctask_pool, RPCTASKPOOL_LWM);
	pool_sethiwat(&rpctask_pool, RPCTASKPOOL_HWM);

	pool_init(&rpcclnt_pool, sizeof(struct rpcclnt), 0, 0, 1, "rpcclnt_p", NULL);

	/* initialize timers */
	timeout_set(&rpcclnt_timer_to, rpcclnt_timer, &rpcclnt_timer_to);
	rpcclnt_timer(&rpcclnt_timer_to);
#else /* !__OpenBSD__ */
	callout_init(&rpcclnt_callout, 0);
#endif /* !__OpenBSD__ */

	RPCDEBUG("rpc initialed");

	return;
}

void
rpcclnt_uninit(void)
{
  	RPCDEBUG("uninit");
	/* XXX delete sysctl variables? */
	callout_stop(&rpcclnt_callout);
}

int
rpcclnt_setup(clnt, program, addr, sotype, soproto, auth, max_read_size, max_write_size, flags)
    struct rpcclnt * clnt;
    struct rpc_program * program;
    struct sockaddr * addr;
    int sotype;
    int soproto;
    struct rpc_auth * auth;
    int max_read_size;
    int max_write_size;
    int flags;
{
	if (clnt == NULL || program == NULL || addr == NULL || auth == NULL)
	  RPC_RETURN (EFAULT);

	if (program->prog_name == NULL)
	  RPC_RETURN (EFAULT);
	clnt->rc_prog = program;

	clnt->rc_name = addr;
	clnt->rc_sotype = sotype;
	clnt->rc_soproto = soproto;
	clnt->rc_auth = auth;
	clnt->rc_rsize = max_read_size;
	clnt->rc_wsize = max_write_size;
	clnt->rc_flag = flags;

	clnt->rc_proctlen = 0;
	clnt->rc_proct = NULL;

	RPC_RETURN (0);
}

/*
 * Initialize sockets and congestion for a new RPC connection. We do not free
 * the sockaddr if error.
 */
int
rpcclnt_connect(rpc, td)
	struct rpcclnt *rpc;
	RPC_EXEC_CTX td;
{
	struct socket  *so;
	int             s, error, rcvreserve, sndreserve;
	struct sockaddr *saddr;

#ifdef __OpenBSD__
	struct sockaddr_in *sin;
	struct mbuf    *m;
#else
	struct sockaddr_in sin;

	int             soarg;
	struct sockopt  opt;
#endif

	if (rpc == NULL) {
		RPCDEBUG("no rpcclnt struct!\n");
		RPC_RETURN(EFAULT);
	}

	/* create the socket */
	rpc->rc_so = NULL;

	saddr = rpc->rc_name;

	error = socreate(saddr->sa_family, &rpc->rc_so, rpc->rc_sotype,
			 rpc->rc_soproto, td->td_ucred, td);
	if (error) {
		RPCDEBUG("error %d in socreate()", error);
		RPC_RETURN(error);
	}
	so = rpc->rc_so;
	rpc->rc_soflags = so->so_proto->pr_flags;

	/*
	 * Some servers require that the client port be a reserved port
	 * number. We always allocate a reserved port, as this prevents
	 * filehandle disclosure through UDP port capture.
	 */
	if (saddr->sa_family == AF_INET) {
#ifdef __OpenBSD__
		struct mbuf    *mopt;
		int            *ip;
#endif

#ifdef __OpenBSD__
		MGET(mopt, M_TRYWAIT, MT_SOOPTS);
		mopt->m_len = sizeof(int);
		ip = mtod(mopt, int *);
		*ip = IP_PORTRANGE_LOW;

		error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt);
#else
		soarg = IP_PORTRANGE_LOW;
		bzero(&opt, sizeof(struct sockopt));
		opt.sopt_dir = SOPT_SET;
		opt.sopt_level = IPPROTO_IP;
		opt.sopt_name = IP_PORTRANGE;
		opt.sopt_val = &soarg;
		opt.sopt_valsize = sizeof(soarg);

		error = sosetopt(so, &opt);
#endif
		if (error)
			goto bad;

#ifdef __OpenBSD__
		MGET(m, M_TRYWAIT, MT_SONAME);
		sin = mtod(m, struct sockaddr_in *);
		sin->sin_len = m->m_len = sizeof(struct sockaddr_in);
		sin->sin_family = AF_INET;
		sin->sin_addr.s_addr = INADDR_ANY;
		sin->sin_port = htons(0);
		error = sobind(so, m);
		m_freem(m);
#else
		sin.sin_len = sizeof(struct sockaddr_in);
		sin.sin_family = AF_INET;
		sin.sin_addr.s_addr = INADDR_ANY;
		sin.sin_port = htons(0);
		/*
		 * &thread0 gives us root credentials to ensure sobind
		 * will give us a reserved ephemeral port.
		 */
		error = sobind(so, (struct sockaddr *) & sin, &thread0);
#endif
		if (error)
			goto bad;

#ifdef __OpenBSD__
		MGET(mopt, M_TRYWAIT, MT_SOOPTS);
		mopt->m_len = sizeof(int);
		ip = mtod(mopt, int *);
		*ip = IP_PORTRANGE_DEFAULT;
		error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt);
#else
		soarg = IP_PORTRANGE_DEFAULT;
		bzero(&opt, sizeof(struct sockopt));
		opt.sopt_dir = SOPT_SET;
		opt.sopt_level = IPPROTO_IP;
		opt.sopt_name = IP_PORTRANGE;
		opt.sopt_val = &soarg;
		opt.sopt_valsize = sizeof(soarg);
		error = sosetopt(so, &opt);
#endif
		if (error)
			goto bad;
	}
	/*
	 * Protocols that do not require connections may be optionally left
	 * unconnected for servers that reply from a port other than
	 * NFS_PORT.
	 */
	if (rpc->rc_flag & RPCCLNT_NOCONN) {
		if (rpc->rc_soflags & PR_CONNREQUIRED) {
			error = ENOTCONN;
			goto bad;
		}
	} else {
		error = soconnect(so, saddr, td);
		if (error)
			goto bad;

		/*
		 * Wait for the connection to complete. Cribbed from the
		 * connect system call but with the wait timing out so that
		 * interruptible mounts don't hang here for a long time.
		 */
#ifdef __OpenBSD__
		s = splsoftnet();
#else
		s = splnet();
#endif
		while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
			(void)tsleep((caddr_t) & so->so_timeo, PSOCK,
				     "rpc", 2 * hz);

			/*
			 * XXX needs to catch interrupt signals. something
			 * like this: if ((so->so_state & SS_ISCONNECTING) &&
			 * so->so_error == 0 && rep && (error =
			 * nfs_sigintr(nmp, rep, rep->r_td)) != 0) {
			 * so->so_state &= ~SS_ISCONNECTING; splx(s); goto
			 * bad; }
			 */
		}
		if (so->so_error) {
			error = so->so_error;
			so->so_error = 0;
			splx(s);
			goto bad;
		}
		splx(s);
	}
	if (rpc->rc_flag & (RPCCLNT_SOFT | RPCCLNT_INT)) {
		so->so_rcv.sb_timeo = (5 * hz);
		so->so_snd.sb_timeo = (5 * hz);
	} else {
		so->so_rcv.sb_timeo = 0;
		so->so_snd.sb_timeo = 0;
	}


	if (rpc->rc_sotype == SOCK_DGRAM) {
		sndreserve = rpc->rc_wsize + RPC_MAXPKTHDR;
		rcvreserve = rpc->rc_rsize + RPC_MAXPKTHDR;
	} else if (rpc->rc_sotype == SOCK_SEQPACKET) {
		sndreserve = (rpc->rc_wsize + RPC_MAXPKTHDR) * 2;
		rcvreserve = (rpc->rc_rsize + RPC_MAXPKTHDR) * 2;
	} else {
		if (rpc->rc_sotype != SOCK_STREAM)
			panic("rpcclnt_connect() bad sotype");
		if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
#ifdef __OpenBSD__
			MGET(m, M_TRYWAIT, MT_SOOPTS);
			*mtod(m, int32_t *) = 1;
			m->m_len = sizeof(int32_t);
			sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m);
#else
			soarg = 1;

			bzero(&opt, sizeof(struct sockopt));
			opt.sopt_dir = SOPT_SET;
			opt.sopt_level = SOL_SOCKET;
			opt.sopt_name = SO_KEEPALIVE;
			opt.sopt_val = &soarg;
			opt.sopt_valsize = sizeof(soarg);
			sosetopt(so, &opt);
#endif
		}
		if (so->so_proto->pr_protocol == IPPROTO_TCP) {
#ifdef __OpenBSD__
			MGET(m, M_TRYWAIT, MT_SOOPTS);
			*mtod(m, int32_t *) = 1;
			m->m_len = sizeof(int32_t);
			sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m);
#else
			soarg = 1;

			bzero(&opt, sizeof(struct sockopt));
			opt.sopt_dir = SOPT_SET;
			opt.sopt_level = IPPROTO_TCP;
			opt.sopt_name = TCP_NODELAY;
			opt.sopt_val = &soarg;
			opt.sopt_valsize = sizeof(soarg);
			sosetopt(so, &opt);
#endif
		}
		sndreserve = (rpc->rc_wsize + RPC_MAXPKTHDR +
			      sizeof(u_int32_t)) * 2;
		rcvreserve = (rpc->rc_rsize + RPC_MAXPKTHDR +
			      sizeof(u_int32_t)) * 2;
	}
	error = soreserve(so, sndreserve, rcvreserve);
	if (error)
		goto bad;
	so->so_rcv.sb_flags |= SB_NOINTR;
	so->so_snd.sb_flags |= SB_NOINTR;

	/* Initialize other non-zero congestion variables */
	rpc->rc_srtt[0] = rpc->rc_srtt[1] = rpc->rc_srtt[2] =
		 rpc->rc_srtt[3] = (RPC_TIMEO << 3);
	rpc->rc_sdrtt[0] = rpc->rc_sdrtt[1] = rpc->rc_sdrtt[2] =
		rpc->rc_sdrtt[3] = 0;
	rpc->rc_cwnd = RPC_MAXCWND / 2;	/* Initial send window */
	rpc->rc_sent = 0;
	rpc->rc_timeouts = 0;
	RPC_RETURN(0);

bad:
	rpcclnt_disconnect(rpc);
	RPC_RETURN(error);
}


/*
 * Reconnect routine:
 * Called when a connection is broken on a reliable protocol.
 * - clean up the old socket
 * - rpcclnt_connect() again
 * - set R_MUSTRESEND for all outstanding requests on mount point
 * If this fails the mount point is DEAD!
 * nb: Must be called with the rpcclnt_sndlock() set on the mount point.
 */
int
rpcclnt_reconnect(rep, td)
	struct rpctask *rep;
	RPC_EXEC_CTX td;
{
	struct rpctask *rp;
	struct rpcclnt *rpc = rep->r_rpcclnt;
	int             error;

	rpcclnt_disconnect(rpc);
	while ((error = rpcclnt_connect(rpc, td)) != 0) {
		if (error == EINTR || error == ERESTART)
			RPC_RETURN(EINTR);
		tsleep(&lbolt, PSOCK, "rpccon", 0);
	}

	/*
	 * Loop through outstanding request list and fix up all requests on
	 * old socket.
	 */
	for (rp = TAILQ_FIRST(&rpctask_q); rp != NULL;
	     rp = TAILQ_NEXT(rp, r_chain)) {
		if (rp->r_rpcclnt == rpc)
			rp->r_flags |= R_MUSTRESEND;
	}
	RPC_RETURN(0);
}

/*
 * RPC transport disconnect. Clean up and unlink.
 */
void
rpcclnt_disconnect(rpc)
	struct rpcclnt *rpc;
{
	struct socket  *so;

	if (rpc->rc_so) {
		so = rpc->rc_so;
		rpc->rc_so = NULL;
		soshutdown(so, 2);
		soclose(so);
	}
}

void
rpcclnt_safedisconnect(struct rpcclnt * rpc)
{
	struct rpctask  dummytask;

	bzero(&dummytask, sizeof(dummytask));
	dummytask.r_rpcclnt = rpc;
	rpcclnt_rcvlock(&dummytask);
	rpcclnt_disconnect(rpc);
	rpcclnt_rcvunlock(&rpc->rc_flag);
}

/*
 * This is the rpc send routine. For connection based socket types, it
 * must be called with an rpcclnt_sndlock() on the socket.
 * "rep == NULL" indicates that it has been called from a server.
 * For the client side:
 * - return EINTR if the RPC is terminated, 0 otherwise
 * - set R_MUSTRESEND if the send fails for any reason
 * - do any cleanup required by recoverable socket errors (?)
 * For the server side:
 * - return EINTR or ERESTART if interrupted by a signal
 * - return EPIPE if a connection is lost for connection based sockets (TCP...)
 * - do any cleanup required by recoverable socket errors (?)
 */
static int
rpcclnt_send(so, nam, top, rep)
	struct socket  *so;
#ifdef __OpenBSD__
	struct mbuf    *nam;
#else
	struct sockaddr *nam;
#endif
	struct mbuf    *top;
	struct rpctask *rep;
{
#ifdef __OpenBSD__
	struct mbuf    *sendnam;
#else
	struct sockaddr *sendnam;
	struct thread  *td = curthread;
#endif
	int error, soflags, flags;

	if (rep) {
		if (rep->r_flags & R_SOFTTERM) {
			m_freem(top);
			RPC_RETURN(EINTR);
		}
		if ((so = rep->r_rpcclnt->rc_so) == NULL) {
			rep->r_flags |= R_MUSTRESEND;
			m_freem(top);
			RPC_RETURN(0);
		}
		rep->r_flags &= ~R_MUSTRESEND;
		soflags = rep->r_rpcclnt->rc_soflags;
	} else
		soflags = so->so_proto->pr_flags;

	if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
		sendnam = NULL;
	else
		sendnam = nam;

	if (so->so_type == SOCK_SEQPACKET)
		flags = MSG_EOR;
	else
		flags = 0;

	/*
	 * XXXRW: If/when this code becomes MPSAFE itself, Giant might have
	 * to be conditionally acquired earlier for the stack so has to avoid
	 * lock order reversals with any locks held over rpcclnt_send().
	 */
	error = sosend(so, sendnam, NULL, top, NULL, flags, td);
	if (error) {
		if (rep) {
			log(LOG_INFO, "rpc send error %d for service %s\n", error,
			    rep->r_rpcclnt->rc_prog->prog_name);
			/*
			 * Deal with errors for the client side.
			 */
			if (rep->r_flags & R_SOFTTERM)
				error = EINTR;
			else
				rep->r_flags |= R_MUSTRESEND;
		} else
			log(LOG_INFO, "rpc service send error %d\n", error);

		/*
		 * Handle any recoverable (soft) socket errors here.
		 */
		if (error != EINTR && error != ERESTART &&
		    error != EWOULDBLOCK && error != EPIPE)
			error = 0;
	}
	RPC_RETURN(error);
}

/*
 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all done by
 * soreceive(), but for SOCK_STREAM we must deal with the Record Mark and
 * consolidate the data into a new mbuf list. nb: Sometimes TCP passes the
 * data up to soreceive() in long lists of small mbufs. For SOCK_STREAM we
 * must be very careful to read an entire record once we have read any of it,
 * even if the system call has been interrupted.
 */
static int
rpcclnt_receive(rep, aname, mp, td)
	struct rpctask *rep;
#ifdef __OpenBSD__
	struct mbuf   **aname;
#else
	struct sockaddr **aname;
#endif
	struct mbuf   **mp;
	RPC_EXEC_CTX  td;
{
	struct socket  *so;
	struct uio      auio;
	struct iovec    aio;
	struct mbuf    *m;
	struct mbuf    *control;
	u_int32_t       len;
#ifdef __OpenBSD__
	struct mbuf   **getnam;
#else
	struct sockaddr **getnam;
#endif
	int error, sotype, rcvflg;

	/*
	 * Set up arguments for soreceive()
	 */
	*mp = NULL;
	*aname = NULL;
	sotype = rep->r_rpcclnt->rc_sotype;

	/*
	 * For reliable protocols, lock against other senders/receivers in
	 * case a reconnect is necessary. For SOCK_STREAM, first get the
	 * Record Mark to find out how much more there is to get. We must
	 * lock the socket against other receivers until we have an entire
	 * rpc request/reply.
	 */
	if (sotype != SOCK_DGRAM) {
		error = rpcclnt_sndlock(&rep->r_rpcclnt->rc_flag, rep);
		if (error)
			RPC_RETURN(error);
tryagain:
		/*
		 * Check for fatal errors and resending request.
		 */
		/*
		 * Ugh: If a reconnect attempt just happened, rc_so would
		 * have changed. NULL indicates a failed attempt that has
		 * essentially shut down this mount point.
		 */
		if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
			rpcclnt_sndunlock(&rep->r_rpcclnt->rc_flag);
			RPC_RETURN(EINTR);
		}
		so = rep->r_rpcclnt->rc_so;
		if (!so) {
			error = rpcclnt_reconnect(rep, td);
			if (error) {
				rpcclnt_sndunlock(&rep->r_rpcclnt->rc_flag);
				RPC_RETURN(error);
			}
			goto tryagain;
		}
		while (rep->r_flags & R_MUSTRESEND) {
			m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
			rpcstats.rpcretries++;
			error = rpcclnt_send(so, rep->r_rpcclnt->rc_name, m, rep);
			if (error) {
				if (error == EINTR || error == ERESTART ||
				    (error = rpcclnt_reconnect(rep, td)) != 0) {
					rpcclnt_sndunlock(&rep->r_rpcclnt->rc_flag);
					RPC_RETURN(error);
				}
				goto tryagain;
			}
		}
		rpcclnt_sndunlock(&rep->r_rpcclnt->rc_flag);
		if (sotype == SOCK_STREAM) {
			aio.iov_base = (caddr_t) & len;
			aio.iov_len = sizeof(u_int32_t);
			auio.uio_iov = &aio;
			auio.uio_iovcnt = 1;
			auio.uio_segflg = UIO_SYSSPACE;
			auio.uio_rw = UIO_READ;
			auio.uio_offset = 0;
			auio.uio_resid = sizeof(u_int32_t);
#ifdef __OpenBSD__
			auio.uio_procp = td;
#else
			auio.uio_td = td;
#endif
			do {
				rcvflg = MSG_WAITALL;
				error = soreceive(so, NULL, &auio, NULL, NULL, &rcvflg);
				if (error == EWOULDBLOCK && rep) {
					if (rep->r_flags & R_SOFTTERM)
						RPC_RETURN(EINTR);
				}
			} while (error == EWOULDBLOCK);
			if (!error && auio.uio_resid > 0) {
				log(LOG_INFO,
				"short receive (%zu/%zu) from rpc server %s\n",
				    sizeof(u_int32_t) - auio.uio_resid,
				    sizeof(u_int32_t),
				    rep->r_rpcclnt->rc_prog->prog_name);
				error = EPIPE;
			}
			if (error)
				goto errout;
			len = ntohl(len) & ~0x80000000;
			/*
			 * This is SERIOUS! We are out of sync with the
			 * sender and forcing a disconnect/reconnect is all I
			 * can do.
			 */
			if (len > RPC_MAXPACKET) {
				log(LOG_ERR, "%s (%d) from rpc server %s\n",
				    "impossible packet length",
				    len,
				    rep->r_rpcclnt->rc_prog->prog_name);
				error = EFBIG;
				goto errout;
			}
			auio.uio_resid = len;
			do {
				rcvflg = MSG_WAITALL;
				error = soreceive(so, NULL, &auio, mp, NULL, &rcvflg);
			} while (error == EWOULDBLOCK || error == EINTR ||
				 error == ERESTART);
			if (!error && auio.uio_resid > 0) {
				log(LOG_INFO,
				"short receive (%d/%d) from rpc server %s\n",
				    len - auio.uio_resid, len,
				    rep->r_rpcclnt->rc_prog->prog_name);
				error = EPIPE;
			}
		} else {
			/*
			 * NB: Since uio_resid is big, MSG_WAITALL is ignored
			 * and soreceive() will return when it has either a
			 * control msg or a data msg. We have no use for
			 * control msg., but must grab them and then throw
			 * them away so we know what is going on.
			 */
			auio.uio_resid = len = 100000000;	/* Anything Big */
#ifdef __OpenBSD__
			auio.uio_procp = td;
#else
			auio.uio_td = td;
#endif
			do {
				rcvflg = 0;
				error = soreceive(so, NULL, &auio, mp, &control, &rcvflg);
				if (control)
					m_freem(control);
				if (error == EWOULDBLOCK && rep) {
					if (rep->r_flags & R_SOFTTERM)
						RPC_RETURN(EINTR);
				}
			} while (error == EWOULDBLOCK ||
				 (!error && *mp == NULL && control));
			if ((rcvflg & MSG_EOR) == 0)
				printf("Egad!!\n");
			if (!error && *mp == NULL)
				error = EPIPE;
			len -= auio.uio_resid;
		}
errout:
		if (error && error != EINTR && error != ERESTART) {
			m_freem(*mp);
			*mp = (struct mbuf *) 0;
			if (error != EPIPE)
				log(LOG_INFO,
				    "receive error %d from rpc server %s\n",
				    error,
				    rep->r_rpcclnt->rc_prog->prog_name);
			error = rpcclnt_sndlock(&rep->r_rpcclnt->rc_flag, rep);
			if (!error)
				error = rpcclnt_reconnect(rep, td);
			if (!error)
				goto tryagain;
		}
	} else {
		if ((so = rep->r_rpcclnt->rc_so) == NULL)
			RPC_RETURN(EACCES);
		if (so->so_state & SS_ISCONNECTED)
			getnam = NULL;
		else
			getnam = aname;
		auio.uio_resid = len = 1000000;
#ifdef __OpenBSD__
		auio.uio_procp = td;
#else
		auio.uio_td = td;
#endif

		do {
			rcvflg = 0;
			error = soreceive(so, getnam, &auio, mp, NULL, &rcvflg);
			RPCDEBUG("soreceive returns %d", error);
			if (error == EWOULDBLOCK && (rep->r_flags & R_SOFTTERM)) {
				RPCDEBUG("wouldblock && softerm -> EINTR");
				RPC_RETURN(EINTR);
			}
		} while (error == EWOULDBLOCK);
		len -= auio.uio_resid;
	}
	if (error) {
		m_freem(*mp);
		*mp = NULL;
	} else {
		/*
		 * Search for any mbufs that are not a multiple of 4 bytes
		 * long or with m_data not longword aligned. These could
		 * cause pointer alignment problems, so copy them to well
		 * aligned mbufs.
		 */
		rpcclnt_realign(mp, 5 * RPCX_UNSIGNED);
	}
	RPC_RETURN(error);
}


/*
 * Implement receipt of reply on a socket. We must search through the list of
 * received datagrams matching them with outstanding requests using the xid,
 * until ours is found.
 */
/* ARGSUSED */
static int
rpcclnt_reply(myrep, td)
	struct rpctask *myrep;
	RPC_EXEC_CTX td;
{
	struct rpctask *rep;
	struct rpcclnt *rpc = myrep->r_rpcclnt;
	int32_t         t1;
	struct mbuf    *mrep, *md;
#ifdef __OpenBSD__
	struct mbuf    *nam;
#else
	struct sockaddr *nam;
#endif
	u_int32_t       rxid, *tl;
	caddr_t         dpos, cp2;
	int             error;

	/*
	 * Loop around until we get our own reply
	 */
	for (;;) {
		/*
		 * Lock against other receivers so that I don't get stuck in
		 * sbwait() after someone else has received my reply for me.
		 * Also necessary for connection based protocols to avoid
		 * race conditions during a reconnect.
		 */
		error = rpcclnt_rcvlock(myrep);
		if (error)
			RPC_RETURN(error);
		/* Already received, bye bye */
		if (myrep->r_mrep != NULL) {
			rpcclnt_rcvunlock(&rpc->rc_flag);
			RPC_RETURN(0);
		}
		/*
		 * Get the next Rpc reply off the socket
		 */
		error = rpcclnt_receive(myrep, &nam, &mrep, td);

		rpcclnt_rcvunlock(&rpc->rc_flag);

		if (error) {
			/*
			 * Ignore routing errors on connectionless
			 * protocols??
			 */
			if (RPCIGNORE_SOERROR(rpc->rc_soflags, error)) {
				rpc->rc_so->so_error = 0;
				if (myrep->r_flags & R_GETONEREP)
					RPC_RETURN(0);
				RPCDEBUG("ingoring routing error on connectionless protocol.");
				continue;
			}
			RPC_RETURN(error);
		}
#ifdef __OpenBSD__
		if (nam)
			m_freem(nam);
#else
		if (nam)
			FREE(nam, M_SONAME);
#endif

		/*
		 * Get the xid and check that it is an rpc reply
		 */
		md = mrep;
		dpos = mtod(md, caddr_t);
		rpcm_dissect(tl, u_int32_t *, 2 * RPCX_UNSIGNED);
		rxid = *tl++;
		if (*tl != rpc_reply) {
			rpcstats.rpcinvalid++;
			m_freem(mrep);
rpcmout:
			if (myrep->r_flags & R_GETONEREP)
				RPC_RETURN(0);
			continue;
		}
		/*
		 * Loop through the request list to match up the reply Iff no
		 * match, just drop the datagram
		 */
		TAILQ_FOREACH(rep, &rpctask_q, r_chain) {
			if (rep->r_mrep == NULL && rxid == rep->r_xid) {
				/* Found it.. */
				rep->r_mrep = mrep;
				rep->r_md = md;
				rep->r_dpos = dpos;

				/*
				 * Update congestion window. Do the additive
				 * increase of one rpc/rtt.
				 */
				if (rpc->rc_cwnd <= rpc->rc_sent) {
					rpc->rc_cwnd +=
						(RPC_CWNDSCALE * RPC_CWNDSCALE +
					(rpc->rc_cwnd >> 1)) / rpc->rc_cwnd;
					if (rpc->rc_cwnd > RPC_MAXCWND)
						rpc->rc_cwnd = RPC_MAXCWND;
				}
				rep->r_flags &= ~R_SENT;
				rpc->rc_sent -= RPC_CWNDSCALE;
				/*
				 * Update rtt using a gain of 0.125 on the
				 * mean and a gain of 0.25 on the deviation.
				 */
				if (rep->r_flags & R_TIMING) {
					/*
					 * Since the timer resolution of
					 * NFS_HZ is so course, it can often
					 * result in r_rtt == 0. Since r_rtt
					 * == N means that the actual rtt is
					 * between N+dt and N+2-dt ticks, add
					 * 1.
					 */
					t1 = rep->r_rtt + 1;
					t1 -= (RPC_SRTT(rpc, rep) >> 3);
					RPC_SRTT(rpc, rep) += t1;
					if (t1 < 0)
						t1 = -t1;
					t1 -= (RPC_SDRTT(rpc, rep) >> 2);
					RPC_SDRTT(rpc, rep) += t1;
				}
				rpc->rc_timeouts = 0;
				break;
			}
		}
		/*
		 * If not matched to a request, drop it. If it's mine, get
		 * out.
		 */
		if (rep == 0) {
			rpcstats.rpcunexpected++;
			RPCDEBUG("rpc reply not matched\n");
			m_freem(mrep);
		} else if (rep == myrep) {
			if (rep->r_mrep == NULL)
				panic("rpcreply nil");
			RPC_RETURN(0);
		}
		if (myrep->r_flags & R_GETONEREP)
			RPC_RETURN(0);
	}
}

/* XXX: ignores tryagain! */
/*
 * code from nfs_request - goes something like this
 *	- fill in task struct
 *	- links task into list
 *	- calls rpcclnt_send() for first transmit
 *	- calls rpcclnt_reply() to get reply
 *	- fills in reply (which should be initialized prior to
 *	  calling), which is valid when 0 is returned and is
 *	  NEVER freed in this function
 * 
 * nb: always frees the request header, but NEVER frees 'mrest'
 * 
 * rpcclnt_setauth() should be used before calling this. EAUTH is returned if
 * authentication fails.
 *
 * note that reply->result_* are invalid unless reply->type ==
 * RPC_MSGACCEPTED and reply->status == RPC_SUCCESS and that reply->verf_*
 * are invalid unless reply->type == RPC_MSGACCEPTED
 */
int
rpcclnt_request(rpc, mrest, procnum, td, cred, reply)
	struct rpcclnt *rpc;
	struct mbuf    *mrest;
	int             procnum;
	RPC_EXEC_CTX	td;
	struct ucred   *cred;
	struct rpc_reply *reply;
{
	struct mbuf    *m, *mrep;
	struct rpctask *task;
	u_int32_t      *tl;
	struct mbuf    *md, *mheadend;
	caddr_t         dpos, cp2;
	int             t1, s, error = 0, mrest_len;
	u_int32_t       xid;

#ifdef __OpenBSD__
	task = pool_get(&rpctask_pool, PR_WAITOK);
#else
	MALLOC(task, struct rpctask *, sizeof(struct rpctask), M_RPC, (M_WAITOK | M_ZERO));
#endif

	task->r_rpcclnt = rpc;
	task->r_procnum = procnum;
	task->r_td = td;

	mrest_len = m_length(mrest, NULL);

	m = rpcclnt_buildheader(rpc, procnum, mrest, mrest_len, &xid, &mheadend,
	    cred);
	/*
	 * This can happen if the auth_type is neither UNIX or NULL
	 */
	if (m == NULL) {
#ifdef __OpenBSD__
		pool_put(&rpctask_pool, task);
#else
		FREE(task, M_RPC);
#endif
		error = EPROTONOSUPPORT;
		goto rpcmout;
	}

	/*
	 * For stream protocols, insert a Sun RPC Record Mark.
	 */
	if (rpc->rc_sotype == SOCK_STREAM) {
		M_PREPEND(m, RPCX_UNSIGNED, M_WAIT);
		*mtod(m, u_int32_t *) = htonl(0x80000000 |
					 (m->m_pkthdr.len - RPCX_UNSIGNED));
	}
	task->r_mreq = m;
	task->r_xid = xid;

	if (rpc->rc_flag & RPCCLNT_SOFT)
		task->r_retry = rpc->rc_retry;
	else
		task->r_retry = RPC_MAXREXMIT + 1;	/* past clip limit */
	task->r_rtt = task->r_rexmit = 0;

	if (rpcclnt_proct(rpc, procnum) > 0)
		task->r_flags = R_TIMING;
	else
		task->r_flags = 0;
	task->r_mrep = NULL;

	/*
	 * Do the client side RPC.
	 */
	rpcstats.rpcrequests++;

	/*
	 * Chain request into list of outstanding requests. Be sure to put it
	 * LAST so timer finds oldest requests first.
	 */
	s = splsoftclock();
	if (TAILQ_EMPTY(&rpctask_q))
		callout_reset(&rpcclnt_callout, rpcclnt_ticks, rpcclnt_timer,
		    NULL);
	TAILQ_INSERT_TAIL(&rpctask_q, task, r_chain);

	/*
	 * If backing off another request or avoiding congestion, don't send
	 * this one now but let timer do it. If not timing a request, do it
	 * now.
	 */
	if (rpc->rc_so && (rpc->rc_sotype != SOCK_DGRAM ||
			   (rpc->rc_flag & RPCCLNT_DUMBTIMR) ||
			   rpc->rc_sent < rpc->rc_cwnd)) {
		splx(s);

		if (rpc->rc_soflags & PR_CONNREQUIRED)
			error = rpcclnt_sndlock(&rpc->rc_flag, task);
		if (!error) {
			error = rpcclnt_send(rpc->rc_so, rpc->rc_name,
					     m_copym(m, 0, M_COPYALL, M_WAIT),
					     task);
			if (rpc->rc_soflags & PR_CONNREQUIRED)
				rpcclnt_sndunlock(&rpc->rc_flag);
		}
		if (!error && (task->r_flags & R_MUSTRESEND) == 0) {
			rpc->rc_sent += RPC_CWNDSCALE;
			task->r_flags |= R_SENT;
		}
	} else {
		splx(s);
		task->r_rtt = -1;
	}

	/*
	 * Wait for the reply from our send or the timer's.
	 */
	if (!error || error == EPIPE)
		error = rpcclnt_reply(task, td);

	/*
	 * RPC done, unlink the request.
	 */
	s = splsoftclock();
	TAILQ_REMOVE(&rpctask_q, task, r_chain);
	if (TAILQ_EMPTY(&rpctask_q))
		callout_stop(&rpcclnt_callout);
	splx(s);

	/*
	 * Decrement the outstanding request count.
	 */
	if (task->r_flags & R_SENT) {
		task->r_flags &= ~R_SENT;	/* paranoia */
		rpc->rc_sent -= RPC_CWNDSCALE;
	}
	/*
	 * If there was a successful reply and a tprintf msg. tprintf a
	 * response.
	 */
	if (!error && (task->r_flags & R_TPRINTFMSG)) {
		mtx_lock(&Giant);
		rpcclnt_msg(task->r_td, rpc->rc_prog->prog_name,
			    "is alive again");
		mtx_unlock(&Giant);
	}

	/* free request header (leaving mrest) */
	mheadend->m_next = NULL;
	m_freem(task->r_mreq);

	/* initialize reply */
	reply->mrep = task->r_mrep;
	reply->verf_md = NULL;
	reply->result_md = NULL;

	mrep = task->r_mrep;
	md = task->r_md;
	dpos = task->r_dpos;

	/* task structure is no longer needed */
#ifdef __OpenBSD__
	pool_put(&rpctask_pool, task);
#else
	FREE(task, M_RPC);
#endif

	if (error)
		goto rpcmout;

	/*
	 * break down the rpc header and check if ok
	 */

	rpcm_dissect(tl, u_int32_t *, RPCX_UNSIGNED);
	reply->stat.type = fxdr_unsigned(u_int32_t, *tl);

	if (reply->stat.type == RPC_MSGDENIED) {
		rpcm_dissect(tl, u_int32_t *, RPCX_UNSIGNED);
		reply->stat.status = fxdr_unsigned(u_int32_t, *tl);

		switch (reply->stat.status) {
		case RPC_MISMATCH:
			rpcm_dissect(tl, u_int32_t *, 2 * RPCX_UNSIGNED);
			reply->stat.mismatch_info.low = fxdr_unsigned(u_int32_t, *tl++);
			reply->stat.mismatch_info.high = fxdr_unsigned(u_int32_t, *tl);
			error = EOPNOTSUPP;
			break;
		case RPC_AUTHERR:
			rpcm_dissect(tl, u_int32_t *, RPCX_UNSIGNED);
			reply->stat.autherr = fxdr_unsigned(u_int32_t, *tl);
			error = EACCES;
			break;
		default:
			error = EBADRPC;
			break;
		}
		goto rpcmout;
	} else if (reply->stat.type != RPC_MSGACCEPTED) {
		error = EBADRPC;
  		goto rpcmout;
  	}

	rpcm_dissect(tl, u_int32_t *, 2 * RPCX_UNSIGNED);

	reply->verf_md = md;
	reply->verf_dpos = dpos;

	reply->verf_type = fxdr_unsigned(u_int32_t, *tl++);
	reply->verf_size = fxdr_unsigned(u_int32_t, *tl);

	if (reply->verf_size != 0)
		rpcm_adv(rpcm_rndup(reply->verf_size));

	rpcm_dissect(tl, u_int32_t *, RPCX_UNSIGNED);
	reply->stat.status = fxdr_unsigned(u_int32_t, *tl);

	if (reply->stat.status == RPC_SUCCESS) {
		if ((uint32_t)(dpos - mtod(md, caddr_t)) >= md->m_len) {
			RPCDEBUG("where is the next mbuf?");
			RPCDEBUG("%d -> %d",
			    (int)(dpos - mtod(md, caddr_t)), md->m_len);
			if (md->m_next == NULL) {
				error = EBADRPC;
				goto rpcmout;
			} else {
				reply->result_md = md->m_next;
				reply->result_dpos = mtod(reply->result_md,
				    caddr_t);
			}
		} else {
			reply->result_md = md;
			reply->result_dpos = dpos;
		}
	} else if (reply->stat.status == RPC_PROGMISMATCH) {
		rpcm_dissect(tl, u_int32_t *, 2 * RPCX_UNSIGNED);
		reply->stat.mismatch_info.low = fxdr_unsigned(u_int32_t, *tl++);
		reply->stat.mismatch_info.high = fxdr_unsigned(u_int32_t, *tl);
		error = EOPNOTSUPP;
		goto rpcmout;
	} else {
		error = EPROTONOSUPPORT;
		goto rpcmout;
	}
	error = 0;

rpcmout:
	RPC_RETURN(error);
}


/*
 * RPC timer routine
 * Scan the rpctask list and retranmit any requests that have timed out.
 * To avoid retransmission attempts on STREAM sockets (in the future) make
 * sure to set the r_retry field to 0 (implies nm_retry == 0).
 */
void
rpcclnt_timer(arg)
	void           *arg;
{
#ifdef __OpenBSD__
	struct timeout *to = (struct timeout *) arg;
#endif
	struct rpctask *rep;
	struct mbuf    *m;
	struct socket  *so;
	struct rpcclnt *rpc;
	int             timeo;
	int             s, error;

#ifndef __OpenBSD__
	struct thread  *td = curthread;
#endif

#ifdef __OpenBSD__
	s = splsoftnet();
#else
	s = splnet();
#endif
	mtx_lock(&Giant);	/* rpc_msg -> tprintf */
	TAILQ_FOREACH(rep, &rpctask_q, r_chain) {
		rpc = rep->r_rpcclnt;
		if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
			continue;
		if (rpcclnt_sigintr(rpc, rep, rep->r_td)) {
			rep->r_flags |= R_SOFTTERM;
			continue;
		}
		if (rep->r_rtt >= 0) {
			rep->r_rtt++;
			if (rpc->rc_flag & RPCCLNT_DUMBTIMR)
				timeo = rpc->rc_timeo;
			else
				timeo = RPC_RTO(rpc, rpcclnt_proct(rep->r_rpcclnt,
							   rep->r_procnum));
			if (rpc->rc_timeouts > 0)
				timeo *= rpcclnt_backoff[rpc->rc_timeouts - 1];
			if (rep->r_rtt <= timeo)
				continue;
			if (rpc->rc_timeouts < 8)
				rpc->rc_timeouts++;
		}
		/*
		 * Check for server not responding
		 */
		if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
		    rep->r_rexmit > rpc->rc_deadthresh) {
			rpcclnt_msg(rep->r_td, rpc->rc_prog->prog_name,
				    "not responding");
			rep->r_flags |= R_TPRINTFMSG;
		}
		if (rep->r_rexmit >= rep->r_retry) {	/* too many */
			rpcstats.rpctimeouts++;
			rep->r_flags |= R_SOFTTERM;
			continue;
		}
		if (rpc->rc_sotype != SOCK_DGRAM) {
			if (++rep->r_rexmit > RPC_MAXREXMIT)
				rep->r_rexmit = RPC_MAXREXMIT;
			continue;
		}
		if ((so = rpc->rc_so) == NULL)
			continue;

		/*
		 * If there is enough space and the window allows.. Resend it
		 * Set r_rtt to -1 in case we fail to send it now.
		 */
		rep->r_rtt = -1;
		if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
		    ((rpc->rc_flag & RPCCLNT_DUMBTIMR) ||
		     (rep->r_flags & R_SENT) ||
		     rpc->rc_sent < rpc->rc_cwnd) &&
		    (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))) {
			if ((rpc->rc_flag & RPCCLNT_NOCONN) == 0)
				error = (*so->so_proto->pr_usrreqs->pru_send) (so, 0, m,
							    NULL, NULL, td);
			else
				error = (*so->so_proto->pr_usrreqs->pru_send)(so, 0, m, rpc->rc_name, NULL, td);
			if (error) {
				if (RPCIGNORE_SOERROR(rpc->rc_soflags, error))
					so->so_error = 0;
			} else {
				/*
				 * Iff first send, start timing else turn
				 * timing off, backoff timer and divide
				 * congestion window by 2.
				 */
				if (rep->r_flags & R_SENT) {
					rep->r_flags &= ~R_TIMING;
					if (++rep->r_rexmit > RPC_MAXREXMIT)
						rep->r_rexmit = RPC_MAXREXMIT;
					rpc->rc_cwnd >>= 1;
					if (rpc->rc_cwnd < RPC_CWNDSCALE)
						rpc->rc_cwnd = RPC_CWNDSCALE;
					rpcstats.rpcretries++;
				} else {
					rep->r_flags |= R_SENT;
					rpc->rc_sent += RPC_CWNDSCALE;
				}
				rep->r_rtt = 0;
			}
		}
	}
	mtx_unlock(&Giant);	/* rpc_msg -> tprintf */
	splx(s);

#ifdef __OpenBSD__
	timeout_add(rpcclnt_timer, to, rpcclnt_ticks);
#else
	callout_reset(&rpcclnt_callout, rpcclnt_ticks, rpcclnt_timer, NULL);
#endif
}

/*
 * Test for a termination condition pending on the process. This is used for
 * RPCCLNT_INT mounts.
 */
int
rpcclnt_sigintr(rpc, task, pr)
	struct rpcclnt *rpc;
	struct rpctask *task;
	RPC_EXEC_CTX pr;
{
	struct proc    *p;

	sigset_t        tmpset;

	if (rpc == NULL) 
		return EFAULT;

	/* XXX deal with forced unmounts */

	if (task && (task->r_flags & R_SOFTTERM))
		RPC_RETURN(EINTR);

	if (!(rpc->rc_flag & RPCCLNT_INT))
		RPC_RETURN(0);

	if (pr == NULL)
		return (0);

#ifdef __OpenBSD__
	p = pr;
	if (p && p->p_siglist &&
	    (((p->p_siglist & ~p->p_sigmask) & ~p->p_sigignore) &
	     RPCINT_SIGMASK))
		RPC_RETURN(EINTR);
#else
	p = pr->td_proc;
	PROC_LOCK(p);
	tmpset = p->p_siglist;
	SIGSETNAND(tmpset, pr->td_sigmask);
	mtx_lock(&p->p_sigacts->ps_mtx);
	SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
	mtx_unlock(&p->p_sigacts->ps_mtx);
	if (SIGNOTEMPTY(p->p_siglist) && RPCCLNTINT_SIGMASK(tmpset)) {
		PROC_UNLOCK(p);
		RPC_RETURN(EINTR);
	}
	PROC_UNLOCK(p);
#endif
	RPC_RETURN(0);
}

/*
 * Lock a socket against others. Necessary for STREAM sockets to ensure you
 * get an entire rpc request/reply and also to avoid race conditions between
 * the processes with nfs requests in progress when a reconnect is necessary.
 */
static int
rpcclnt_sndlock(flagp, task)
	int            *flagp;
	struct rpctask *task;
{
	RPC_EXEC_CTX p;
	int             slpflag = 0, slptimeo = 0;

	p = task->r_td;
	if (task->r_rpcclnt->rc_flag & RPCCLNT_INT)
		slpflag = PCATCH;
	while (*flagp & RPCCLNT_SNDLOCK) {
		if (rpcclnt_sigintr(task->r_rpcclnt, task, p))
			RPC_RETURN(EINTR);
		*flagp |= RPCCLNT_WANTSND;
		(void)tsleep((caddr_t) flagp, slpflag | (PZERO - 1), "rpcsndlck",
			     slptimeo);
		if (slpflag == PCATCH) {
			slpflag = 0;
			slptimeo = 2 * hz;
		}
	}
	*flagp |= RPCCLNT_SNDLOCK;
	RPC_RETURN(0);
}

/*
 * Unlock the stream socket for others.
 */
static void
rpcclnt_sndunlock(flagp)
	int            *flagp;
{

	if ((*flagp & RPCCLNT_SNDLOCK) == 0)
		panic("rpc sndunlock");
	*flagp &= ~RPCCLNT_SNDLOCK;
	if (*flagp & RPCCLNT_WANTSND) {
		*flagp &= ~RPCCLNT_WANTSND;
		wakeup((caddr_t) flagp);
	}
}

static int
rpcclnt_rcvlock(task)
	struct rpctask *task;
{
	int            *flagp = &task->r_rpcclnt->rc_flag;
	int             slpflag, slptimeo = 0;

	if (*flagp & RPCCLNT_INT)
		slpflag = PCATCH;
	else
		slpflag = 0;
	while (*flagp & RPCCLNT_RCVLOCK) {
		if (rpcclnt_sigintr(task->r_rpcclnt, task, task->r_td))
			RPC_RETURN(EINTR);
		*flagp |= RPCCLNT_WANTRCV;
		(void)tsleep((caddr_t) flagp, slpflag | (PZERO - 1), "rpcrcvlk",
			     slptimeo);
		if (slpflag == PCATCH) {
			slpflag = 0;
			slptimeo = 2 * hz;
		}
	}
	*flagp |= RPCCLNT_RCVLOCK;
	RPC_RETURN(0);
}

/*
 * Unlock the stream socket for others.
 */
static void
rpcclnt_rcvunlock(flagp)
	int            *flagp;
{

	if ((*flagp & RPCCLNT_RCVLOCK) == 0)
		panic("nfs rcvunlock");
	*flagp &= ~RPCCLNT_RCVLOCK;
	if (*flagp & RPCCLNT_WANTRCV) {
		*flagp &= ~RPCCLNT_WANTRCV;
		wakeup((caddr_t) flagp);
	}
}

#if 0
/*
 * Check for badly aligned mbuf data areas and realign data in an mbuf list
 * by copying the data areas up, as required.
 */
void
rpcclnt_realign(m, hsiz)
	struct mbuf    *m;
	int             hsiz;
{
	struct mbuf    *m2;
	int             siz, mlen, olen;
	caddr_t         tcp, fcp;
	struct mbuf    *mnew;

	while (m) {
		/*
		 * This never happens for UDP, rarely happens for TCP but
		 * frequently happens for iso transport.
		 */
		if ((m->m_len & 0x3) || (mtod(m, long)&0x3)) {
			olen = m->m_len;
			fcp = mtod(m, caddr_t);
			if ((long)fcp & 0x3) {
				if (m->m_flags & M_PKTHDR)
					m_tag_delete_chain(m, NULL);
				m->m_flags &= ~M_PKTHDR;
				if (m->m_flags & M_EXT)
					m->m_data = m->m_ext.ext_buf +
						((m->m_ext.ext_size - olen) & ~0x3);
				else
					m->m_data = m->m_dat;
			}
			m->m_len = 0;
			tcp = mtod(m, caddr_t);
			mnew = m;
			m2 = m->m_next;

			/*
			 * If possible, only put the first invariant part of
			 * the RPC header in the first mbuf.
			 */
			mlen = M_TRAILINGSPACE(m);
			if (olen <= hsiz && mlen > hsiz)
				mlen = hsiz;

			/* Loop through the mbuf list consolidating data. */
			while (m) {
				while (olen > 0) {
					if (mlen == 0) {
						if (m2->m_flags & M_PKTHDR)
							m_tag_delete_chain(m2, NULL);
						m2->m_flags &= ~M_PKTHDR;
						if (m2->m_flags & M_EXT)
							m2->m_data = m2->m_ext.ext_buf;
						else
							m2->m_data = m2->m_dat;
						m2->m_len = 0;
						mlen = M_TRAILINGSPACE(m2);
						tcp = mtod(m2, caddr_t);
						mnew = m2;
						m2 = m2->m_next;
					}
					siz = min(mlen, olen);
					if (tcp != fcp)
						bcopy(fcp, tcp, siz);
					mnew->m_len += siz;
					mlen -= siz;
					olen -= siz;
					tcp += siz;
					fcp += siz;
				}
				m = m->m_next;
				if (m) {
					olen = m->m_len;
					fcp = mtod(m, caddr_t);
				}
			}

			/*
			 * Finally, set m_len == 0 for any trailing mbufs
			 * that have been copied out of.
			 */
			while (m2) {
				m2->m_len = 0;
				m2 = m2->m_next;
			}
			return;
		}
		m = m->m_next;
	}
}
#else
static void
rpcclnt_realign(struct mbuf **pm, int hsiz)
{
	struct mbuf *m;
	struct mbuf *n = NULL;
	int off = 0;

	RPCDEBUG("in rpcclnt_realign()");

	while ((m = *pm) != NULL) {
	    if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
	        MGET(n, M_WAIT, MT_DATA);
	        if (m->m_len >= MINCLSIZE) {
	            MCLGET(n, M_WAIT);
	        }
	        n->m_len = 0;
	        break;
	    }
	    pm = &m->m_next;
	}

	/*
	* If n is non-NULL, loop on m copying data, then replace the
	* portion of the chain that had to be realigned.
	*/
	if (n != NULL) {
	    while (m) {
	        m_copyback(n, off, m->m_len, mtod(m, caddr_t));
	        off += m->m_len;
	        m = m->m_next;
	    }
	    m_freem(*pm);
	    *pm = n;
	}

	RPCDEBUG("leave rpcclnt_realign()");
}
#endif

static int
rpcclnt_msg(p, server, msg)
	RPC_EXEC_CTX   p;
	const char     *server;
	char           *msg;
{
#ifdef __OpenBSD__
	tpr_t           tpr;
	struct proc    *pr = p;

	if (p)
		tpr = tprintf_open(p);
	else
		tpr = NULL;
	tprintf(tpr, "rpc server %s: %s\n", server, msg);
	tprintf_close(tpr);
	RPC_RETURN(0);
#else
	GIANT_REQUIRED;

	tprintf(p ? p->td_proc : NULL, LOG_INFO,
		"nfs server %s: %s\n", server, msg);
	RPC_RETURN(0);
#endif
}

/*
 * Build the RPC header and fill in the authorization info. The authorization
 * string argument is only used when the credentials come from outside of the
 * kernel (AUTH_KERB). (likewise, the ucred is only used when inside the
 * kernel) Returns the head of the mbuf list.
 */
static struct mbuf    *
rpcclnt_buildheader(rc, procid, mrest, mrest_len, xidp, mheadend, cred)
	struct rpcclnt *rc;
	int             procid;
	struct mbuf    *mrest;
	u_int32_t       mrest_len;
	int            *xidp;
	struct mbuf   **mheadend;
	struct ucred * cred;
{
	/* register */ struct mbuf *mb;
	register u_int32_t *tl;
	/* register */ caddr_t bpos;
	struct mbuf *mreq, *mb2;
	int error;

	MGETHDR(mb, M_WAIT, MT_DATA);
	if (6 * RPCX_UNSIGNED >= MINCLSIZE) {
		MCLGET(mb, M_WAIT);
	} else if (6 * RPCX_UNSIGNED < MHLEN) {
		MH_ALIGN(mb, 6 * RPCX_UNSIGNED);
	} else {
	  	RPCDEBUG("mbuf too small");
		panic("cheap bailout");
	}
	mb->m_len = 0;
	mreq = mb;
	bpos = mtod(mb, caddr_t);

	/*
	 * First the RPC header.
	 */
	rpcm_build(tl, u_int32_t *, 6 * RPCX_UNSIGNED);

	/* Get a new (non-zero) xid */
	if ((rpcclnt_xid == 0) && (rpcclnt_xid_touched == 0)) {
		rpcclnt_xid = arc4random();
		rpcclnt_xid_touched = 1;
	} else {
		while ((*xidp = arc4random() % 256) == 0);
		rpcclnt_xid += *xidp;
	}

	/* XXX: funky... */
	*tl++ = *xidp = txdr_unsigned(rpcclnt_xid);

	*tl++ = rpc_call;
	*tl++ = rpc_vers;
	*tl++ = txdr_unsigned(rc->rc_prog->prog_id);
	*tl++ = txdr_unsigned(rc->rc_prog->prog_version);
	*tl++ = txdr_unsigned(procid);

	if ((error = rpcauth_buildheader(rc->rc_auth, cred, &mb, &bpos))) {
		m_freem(mreq);
		RPCDEBUG("rpcauth_buildheader failed %d", error);
		return NULL;
	}

	mb->m_next = mrest;
	*mheadend = mb;
	mreq->m_pkthdr.len = m_length(mreq, NULL);
	mreq->m_pkthdr.rcvif = NULL;
	return (mreq);
}

/*
 * Help break down an mbuf chain by setting the first siz bytes contiguous
 * pointed to by returned val. This is used by the macros rpcm_dissect and
 * rpcm_dissecton for tough cases. (The macros use the vars. dpos and dpos2)
 */
static int
rpcm_disct(mdp, dposp, siz, left, cp2)
	struct mbuf   **mdp;
	caddr_t        *dposp;
	int             siz;
	int             left;
	caddr_t        *cp2;
{
	struct mbuf    *mp, *mp2;
	int             siz2, xfer;
	caddr_t         p;

	mp = *mdp;
	while (left == 0) {
		*mdp = mp = mp->m_next;
		if (mp == NULL)
			RPC_RETURN(EBADRPC);
		left = mp->m_len;
		*dposp = mtod(mp, caddr_t);
	}
	if (left >= siz) {
		*cp2 = *dposp;
		*dposp += siz;
	} else if (mp->m_next == NULL) {
		RPC_RETURN(EBADRPC);
	} else if (siz > MHLEN) {
		panic("rpc S too big");
	} else {
		MGET(mp2, M_WAIT, MT_DATA);
		mp2->m_next = mp->m_next;
		mp->m_next = mp2;
		mp->m_len -= left;
		mp = mp2;
		*cp2 = p = mtod(mp, caddr_t);
		bcopy(*dposp, p, left);	/* Copy what was left */
		siz2 = siz - left;
		p += left;
		mp2 = mp->m_next;
		/* Loop around copying up the siz2 bytes */
		while (siz2 > 0) {
			if (mp2 == NULL)
				RPC_RETURN(EBADRPC);
			xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
			if (xfer > 0) {
				bcopy(mtod(mp2, caddr_t), p, xfer);
				RPCMADV(mp2, xfer);
				mp2->m_len -= xfer;
				p += xfer;
				siz2 -= xfer;
			}
			if (siz2 > 0)
				mp2 = mp2->m_next;
		}
		mp->m_len = siz;
		*mdp = mp2;
		*dposp = mtod(mp2, caddr_t);
	}
	RPC_RETURN(0);
}



static u_int32_t
rpcclnt_proct(rpc, procid)
	struct rpcclnt *rpc;
	u_int32_t       procid;
{
	if (rpc->rc_proctlen != 0 && rpc->rc_proct != NULL &&
	    procid < rpc->rc_proctlen) {
		return rpc->rc_proct[procid];
	}
	return (0);
}

static int
rpc_adv(mdp, dposp, offs, left)
	struct mbuf   **mdp;
	caddr_t        *dposp;
	int             offs;
	int             left;
{
	struct mbuf    *m;
	int             s;

	m = *mdp;
	s = left;
	while (s < offs) {
		offs -= s;
		m = m->m_next;
		if (m == NULL)
			RPC_RETURN(EBADRPC);
		s = m->m_len;
	}
	*mdp = m;
	*dposp = mtod(m, caddr_t) + offs;
	RPC_RETURN(0);
}

int
rpcclnt_cancelreqs(rpc)
	struct rpcclnt *rpc;
{
	struct rpctask *task;
	int             i, s;

	s = splnet();
	TAILQ_FOREACH(task, &rpctask_q, r_chain) {
		if (rpc != task->r_rpcclnt || task->r_mrep != NULL ||
		    (task->r_flags & R_SOFTTERM))
			continue;
		rpcclnt_softterm(task);
	}
	splx(s);

	for (i = 0; i < 30; i++) {
		s = splnet();
		TAILQ_FOREACH(task, &rpctask_q, r_chain) {
			if (rpc == task->r_rpcclnt)
				break;
		}
		splx(s);
		if (task == NULL)
			return (0);
		tsleep(&lbolt, PSOCK, "nfscancel", 0);
	}
	return (EBUSY);
}

static void
rpcclnt_softterm(struct rpctask * task)
{
	task->r_flags |= R_SOFTTERM;
	if (task->r_flags & R_SENT) {
		task->r_rpcclnt->rc_sent -= RPC_CWNDSCALE;
		task->r_flags &= ~R_SENT;
	}
}


#ifndef __OpenBSD__
/* called by rpcclnt_get() */
void
rpcclnt_create(struct rpcclnt ** rpc)
{
	MALLOC(*rpc, struct rpcclnt *, sizeof(struct rpcclnt), M_RPC, M_WAITOK | M_ZERO);
}

/* called by rpcclnt_put() */
void
rpcclnt_destroy(struct rpcclnt * rpc)
{
	if (rpc != NULL) {
		FREE(rpc, M_RPC);
	} else {
		RPCDEBUG("attempting to free a NULL rpcclnt (not dereferenced)");
	}
}
#endif				/* !__OpenBSD__ */


/* XXX: add a lock around the auth structure in struct rpcclnt and make this
 * call safe for calling durring a connection */
static int
rpcauth_buildheader(struct rpc_auth * auth, struct ucred * cred, struct mbuf ** mhdr, caddr_t * bp)
{
	size_t authsiz, verfsiz;
	uint32_t mlen, grpsiz;
	register struct mbuf *mb, *mb2;
	caddr_t bpos;
	register u_int32_t *tl;
	register int i;

	if (auth == NULL || mhdr == NULL)
	  return EFAULT;

	switch (auth->auth_type) {
	case RPCAUTH_NULL:
	  	authsiz = 0;
		verfsiz = 0;
	break;
	case RPCAUTH_UNIX:
		authsiz = (5 + cred->cr_ngroups) * RPCX_UNSIGNED;
		verfsiz = 0;
	break;
	default:
		return EPROTONOSUPPORT;
	break;
	};

	mlen = rpcm_rndup(authsiz) + rpcm_rndup(verfsiz) + 4 * RPCX_UNSIGNED;

	mb = *mhdr;
	bpos = *bp;

	rpcm_build(tl, u_int32_t *, mlen);

	*bp = bpos;
	*mhdr = mb;

	*tl++ = txdr_unsigned(auth->auth_type);
	*tl++ = txdr_unsigned(authsiz);
	switch (auth->auth_type) {
	case RPCAUTH_UNIX:
	 	*tl++ = 0;
	 	*tl++ = 0; 

		*tl++ = txdr_unsigned(cred->cr_uid);
		*tl++ = txdr_unsigned(cred->cr_groups[0]);
		grpsiz = cred->cr_ngroups;
		*tl++ = txdr_unsigned(grpsiz);
		/* XXX: groups[0] is already sent... */
		for (i = 0 ; i < grpsiz ; i++) {
			 *tl++ = txdr_unsigned(cred->cr_groups[i]);
		}

		/* null verification header */
		*tl++ = txdr_unsigned(RPCAUTH_NULL);
		*tl++ = 0;
	break;
	case RPCAUTH_NULL:
		/* just a null verf header */
		*tl++ = txdr_unsigned(RPCAUTH_NULL);
		*tl = 0;
	break;
	default:
		panic("inconsistent rpc auth type");
	break;
	}

	return 0;
}
OpenPOWER on IntegriCloud