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1 /*-
2  * Copyright (c) 2005-2011 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 560 2009-05-07 07:37:49Z 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 static MALLOC_DEFINE(M_ISC, "iSC", "iSCSI driver options");
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_ISC, M_WAITOK);
70      if(copyinstr(s, p, maxlen, &len)) {
71           free(p, M_ISC);
72           return NULL;
73      }
74      q = malloc(len, M_ISC, M_WAITOK);
75      bcopy(p, q, len);
76      free(p, M_ISC);
77
78      return q;
79 }
80 #if __FreeBSD_version < 800000
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 __inline int
169 calculate_crc32c(uint32_t crc, const void *buf, size_t size)
170 {
171      const uint8_t *p = buf;
172
173      while (size--)
174           crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
175      return crc;
176 }
177 #endif
178
179 static uint32_t
180 i_crc32c(const void *buf, size_t size, uint32_t crc)
181 {
182      crc = crc ^ 0xffffffff;
183      crc = calculate_crc32c(crc, buf, size);
184      crc = crc ^ 0xffffffff;
185      return crc;
186 }
187
188 /*
189  | XXX: not finished coding
190  */
191 int
192 i_setopt(isc_session_t *sp, isc_opt_t *opt)
193 {
194      if(opt->maxRecvDataSegmentLength > 0) {
195           sp->opt.maxRecvDataSegmentLength = opt->maxRecvDataSegmentLength;
196           sdebug(2, "maxRecvDataSegmentLength=%d", sp->opt.maxRecvDataSegmentLength);
197      }
198      if(opt->maxXmitDataSegmentLength > 0) {
199           // danny's RFC
200           sp->opt.maxXmitDataSegmentLength = opt->maxXmitDataSegmentLength;
201           sdebug(2, "opt.maXmitDataSegmentLength=%d", sp->opt.maxXmitDataSegmentLength);
202      }
203      if(opt->maxBurstLength != 0) {
204           sp->opt.maxBurstLength = opt->maxBurstLength;
205           sdebug(2, "opt.maxBurstLength=%d", sp->opt.maxBurstLength);
206      }
207
208      if(opt->targetAddress != NULL) {
209           if(sp->opt.targetAddress != NULL)
210                free(sp->opt.targetAddress, M_ISC);
211           sp->opt.targetAddress = i_strdupin(opt->targetAddress, 128);
212           sdebug(2, "opt.targetAddress='%s'", sp->opt.targetAddress);
213      }
214      if(opt->targetName != NULL) {
215           if(sp->opt.targetName != NULL)
216                free(sp->opt.targetName, M_ISC);
217           sp->opt.targetName = i_strdupin(opt->targetName, 128);
218           sdebug(2, "opt.targetName='%s'", sp->opt.targetName);
219      }
220      if(opt->initiatorName != NULL) {
221           if(sp->opt.initiatorName != NULL)
222                free(sp->opt.initiatorName, M_ISC);
223           sp->opt.initiatorName = i_strdupin(opt->initiatorName, 128);
224           sdebug(2, "opt.initiatorName='%s'", sp->opt.initiatorName);
225      }
226
227      if(opt->maxluns > 0) {
228           if(opt->maxluns > ISCSI_MAX_LUNS)
229                sp->opt.maxluns = ISCSI_MAX_LUNS; // silently chop it down ...
230           sp->opt.maxluns = opt->maxluns;
231           sdebug(2, "opt.maxluns=%d", sp->opt.maxluns);
232      }
233
234      if(opt->headerDigest != NULL) {
235           sdebug(2, "opt.headerDigest='%s'", opt->headerDigest);
236           if(strcmp(opt->headerDigest, "CRC32C") == 0) {
237                sp->hdrDigest = (digest_t *)i_crc32c;
238                sdebug(2, "opt.headerDigest set");
239           }
240      }
241      if(opt->dataDigest != NULL) {
242           sdebug(2, "opt.dataDigest='%s'", opt->headerDigest);
243           if(strcmp(opt->dataDigest, "CRC32C") == 0) {
244                sp->dataDigest = (digest_t *)i_crc32c;
245                sdebug(2, "opt.dataDigest set");
246           }
247      }
248
249      return 0;
250 }
251
252 void
253 i_freeopt(isc_opt_t *opt)
254 {
255      debug_called(8);
256
257      if(opt->targetAddress != NULL) {
258           free(opt->targetAddress, M_ISC);
259           opt->targetAddress = NULL;
260      }
261      if(opt->targetName != NULL) {
262           free(opt->targetName, M_ISC);
263           opt->targetName = NULL;
264      }
265      if(opt->initiatorName != NULL) {
266           free(opt->initiatorName, M_ISC);
267           opt->initiatorName = NULL;
268      }
269 }