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[FreeBSD/releng/7.2.git] / sys / dev / iscsi / initiator / isc_subr.c
1 /*-
2  * Copyright (c) 2005-2007 Daniel Braniss <danny@cs.huji.ac.il>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  */
27 /*
28  | iSCSI
29  | $Id: isc_subr.c,v 1.20 2006/12/01 09:10:17 danny Exp danny $
30  */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include "opt_iscsi_initiator.h"
36
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/conf.h>
40 #include <sys/systm.h>
41 #include <sys/malloc.h>
42 #include <sys/ctype.h>
43 #include <sys/errno.h>
44 #include <sys/sysctl.h>
45 #include <sys/file.h>
46 #include <sys/uio.h>
47 #include <sys/socketvar.h>
48 #include <sys/socket.h>
49 #include <sys/protosw.h>
50 #include <sys/proc.h>
51 #include <sys/ioccom.h>
52 #include <sys/queue.h>
53 #include <sys/kthread.h>
54 #include <sys/syslog.h>
55 #include <sys/mbuf.h>
56 #include <sys/libkern.h>
57
58 #include <dev/iscsi/initiator/iscsi.h>
59 #include <dev/iscsi/initiator/iscsivar.h>
60
61 MALLOC_DEFINE(M_PDU, "iSCSI pdu", "iSCSI driver");
62
63 static char *
64 i_strdupin(char *s, size_t maxlen)
65 {
66      size_t     len;
67      char       *p, *q;
68
69      p = malloc(maxlen, M_ISCSI, M_WAITOK);
70      if(copyinstr(s, p, maxlen, &len)) {
71           free(p, M_ISCSI);
72           return NULL;
73      }
74      q = malloc(len, M_ISCSI, M_WAITOK);
75      bcopy(p, q, len);
76      free(p, M_ISCSI);
77
78      return q;
79 }
80
81 /*****************************************************************/
82 /*                                                               */
83 /* CRC LOOKUP TABLE                                              */
84 /* ================                                              */
85 /* The following CRC lookup table was generated automagically    */
86 /* by the Rocksoft^tm Model CRC Algorithm Table Generation       */
87 /* Program V1.0 using the following model parameters:            */
88 /*                                                               */
89 /*    Width   : 4 bytes.                                         */
90 /*    Poly    : 0x1EDC6F41L                                      */
91 /*    Reverse : TRUE.                                            */
92 /*                                                               */
93 /* For more information on the Rocksoft^tm Model CRC Algorithm,  */
94 /* see the document titled "A Painless Guide to CRC Error        */
95 /* Detection Algorithms" by Ross Williams                        */
96 /* (ross@guest.adelaide.edu.au.). This document is likely to be  */
97 /* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft".        */
98 /*                                                               */
99 /*****************************************************************/
100
101 static uint32_t crc32Table[256] = {
102     0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
103     0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
104     0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
105     0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
106     0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
107     0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
108     0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
109     0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
110     0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
111     0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
112     0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
113     0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
114     0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
115     0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
116     0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
117     0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
118     0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
119     0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
120     0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
121     0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
122     0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
123     0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
124     0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
125     0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
126     0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
127     0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
128     0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
129     0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
130     0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
131     0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
132     0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
133     0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
134     0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
135     0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
136     0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
137     0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
138     0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
139     0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
140     0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
141     0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
142     0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
143     0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
144     0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
145     0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
146     0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
147     0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
148     0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
149     0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
150     0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
151     0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
152     0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
153     0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
154     0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
155     0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
156     0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
157     0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
158     0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
159     0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
160     0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
161     0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
162     0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
163     0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
164     0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
165     0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
166 };
167
168 static uint32_t
169 i_crc32c(const void *buf, size_t size, uint32_t crc)
170 {
171      const uint8_t *p = buf;
172
173      crc = crc ^ 0xffffffff;
174      while (size--)
175           crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
176      crc = crc ^ 0xffffffff;
177      return crc;
178 }
179
180 /*
181  | XXX: not finished coding
182  */
183 int
184 i_setopt(isc_session_t *sp, isc_opt_t *opt)
185 {
186      if(opt->maxRecvDataSegmentLength > 0) {
187           sp->opt.maxRecvDataSegmentLength = opt->maxRecvDataSegmentLength;
188           sdebug(2, "maxRecvDataSegmentLength=%d", sp->opt.maxRecvDataSegmentLength);
189      }
190      if(opt->maxXmitDataSegmentLength > 0) {
191           // danny's RFC
192           sp->opt.maxXmitDataSegmentLength = opt->maxXmitDataSegmentLength;
193           sdebug(2, "maXmitDataSegmentLength=%d", sp->opt.maxXmitDataSegmentLength);
194      }
195      if(opt->maxBurstLength != 0) {
196           sp->opt.maxBurstLength = opt->maxBurstLength;
197           sdebug(2, "maxBurstLength=%d", sp->opt.maxBurstLength);
198      }
199
200      if(opt->targetAddress != NULL) {
201           if(sp->opt.targetAddress != NULL)
202                free(sp->opt.targetAddress, M_ISCSI);
203           sp->opt.targetAddress = i_strdupin(opt->targetAddress, 128);
204           sdebug(4, "opt.targetAddress='%s'", sp->opt.targetAddress);
205      }
206      if(opt->targetName != NULL) {
207           if(sp->opt.targetName != NULL)
208                free(sp->opt.targetName, M_ISCSI);
209           sp->opt.targetName = i_strdupin(opt->targetName, 128);
210           sdebug(4, "opt.targetName='%s'", sp->opt.targetName);
211      }
212      if(opt->initiatorName != NULL) {
213           if(sp->opt.initiatorName != NULL)
214                free(sp->opt.initiatorName, M_ISCSI);
215           sp->opt.initiatorName = i_strdupin(opt->initiatorName, 128);
216           sdebug(4, "opt.initiatorName='%s'", sp->opt.initiatorName);
217      }
218
219      if(opt->maxluns > 0) {
220           if(opt->maxluns > ISCSI_MAX_LUNS)
221                sp->opt.maxluns = ISCSI_MAX_LUNS; // silently chop it down ...
222           sp->opt.maxluns = opt->maxluns;
223           sdebug(4, "opt.maxluns=%d", sp->opt.maxluns);
224      }
225
226      if(opt->headerDigest != NULL) {
227           sdebug(2, "opt.headerDigest='%s'", opt->headerDigest);
228           if(strcmp(opt->headerDigest, "CRC32C") == 0) {
229                sp->hdrDigest = (digest_t *)i_crc32c;
230                sdebug(2, "headerDigest set");
231           }
232      }
233      if(opt->dataDigest != NULL) {
234           if(strcmp(opt->dataDigest, "CRC32C") == 0) {
235                sp->dataDigest = (digest_t *)i_crc32c;
236                sdebug(2, "dataDigest set");
237           }
238      }
239
240      return 0;
241 }
242
243 void
244 i_freeopt(isc_opt_t *opt)
245 {
246      if(opt->targetAddress != NULL) {
247           free(opt->targetAddress, M_ISCSI);
248           opt->targetAddress = NULL;
249      }
250      if(opt->targetName != NULL) {
251           free(opt->targetName, M_ISCSI);
252           opt->targetName = NULL;
253      }
254      if(opt->initiatorName != NULL) {
255           free(opt->initiatorName, M_ISCSI);
256           opt->initiatorName = NULL;
257      }
258 }