FreeBSD/Linux Kernel Cross Reference
sys/dev/iscsi_initiator/isc_subr.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2005-2011 Daniel Braniss <danny@cs.huji.ac.il>
      * All rights reserved.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     */
    /*
     | iSCSI
     | $Id: isc_subr.c 560 2009-05-07 07:37:49Z danny $
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/dev/iscsi_initiator/isc_subr.c 326255 2017-11-27 14:52:40Z pfg $");
    
    #include "opt_iscsi_initiator.h"
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/conf.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    #include <sys/ctype.h>
    #include <sys/errno.h>
    #include <sys/sysctl.h>
    #include <sys/file.h>
    #include <sys/uio.h>
    #include <sys/socketvar.h>
    #include <sys/socket.h>
    #include <sys/protosw.h>
    #include <sys/proc.h>
    #include <sys/ioccom.h>
    #include <sys/queue.h>
    #include <sys/kthread.h>
    #include <sys/syslog.h>
    #include <sys/mbuf.h>
    #include <sys/libkern.h>
    #include <vm/uma.h>
    
    #include <dev/iscsi_initiator/iscsi.h>
    #include <dev/iscsi_initiator/iscsivar.h>
    
    static MALLOC_DEFINE(M_ISC, "iSC", "iSCSI driver options");
    
    static char *
    i_strdupin(char *s, size_t maxlen)
    {
         size_t     len;
         char       *p, *q;
    
         p = malloc(maxlen, M_ISC, M_WAITOK);
         if(copyinstr(s, p, maxlen, &len)) {
              free(p, M_ISC);
              return NULL;
         }
         q = malloc(len, M_ISC, M_WAITOK);
         bcopy(p, q, len);
         free(p, M_ISC);
    
         return q;
    }
    #if __FreeBSD_version < 800000
    /*****************************************************************/
    /*                                                               */
    /* CRC LOOKUP TABLE                                              */
    /* ================                                              */
    /* The following CRC lookup table was generated automagically    */
    /* by the Rocksoft^tm Model CRC Algorithm Table Generation       */
    /* Program V1.0 using the following model parameters:            */
    /*                                                               */
    /*    Width   : 4 bytes.                                         */
    /*    Poly    : 0x1EDC6F41L                                      */
    /*    Reverse : TRUE.                                            */
    /*                                                               */
    /* For more information on the Rocksoft^tm Model CRC Algorithm,  */
    /* see the document titled "A Painless Guide to CRC Error        */
    /* Detection Algorithms" by Ross Williams                        */
    /* (ross@guest.adelaide.edu.au.). This document is likely to be  */
   /* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft".        */
   /*                                                               */
   /*****************************************************************/
   
   static uint32_t crc32Table[256] = {
       0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
       0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
       0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
       0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
       0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
       0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
       0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
       0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
       0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
       0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
       0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
       0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
       0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
       0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
       0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
       0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
       0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
       0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
       0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
       0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
       0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
       0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
       0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
       0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
       0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
       0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
       0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
       0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
       0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
       0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
       0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
       0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
       0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
       0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
       0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
       0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
       0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
       0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
       0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
       0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
       0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
       0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
       0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
       0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
       0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
       0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
       0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
       0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
       0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
       0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
       0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
       0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
       0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
       0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
       0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
       0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
       0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
       0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
       0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
       0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
       0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
       0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
       0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
       0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
   };
   
   static __inline int
   calculate_crc32c(uint32_t crc, const void *buf, size_t size)
   {
        const uint8_t *p = buf;
   
        while (size--)
             crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
        return crc;
   }
   #endif
   
   static uint32_t
   i_crc32c(const void *buf, size_t size, uint32_t crc)
   {
        crc = crc ^ 0xffffffff;
        crc = calculate_crc32c(crc, buf, size);
        crc = crc ^ 0xffffffff;
        return crc;
   }
   
   /*
    | XXX: not finished coding
    */
   int
   i_setopt(isc_session_t *sp, isc_opt_t *opt)
   {
        if(opt->maxRecvDataSegmentLength > 0) {
             sp->opt.maxRecvDataSegmentLength = opt->maxRecvDataSegmentLength;
             sdebug(2, "maxRecvDataSegmentLength=%d", sp->opt.maxRecvDataSegmentLength);
        }
        if(opt->maxXmitDataSegmentLength > 0) {
             // danny's RFC
             sp->opt.maxXmitDataSegmentLength = opt->maxXmitDataSegmentLength;
             sdebug(2, "opt.maXmitDataSegmentLength=%d", sp->opt.maxXmitDataSegmentLength);
        }
        if(opt->maxBurstLength != 0) {
             sp->opt.maxBurstLength = opt->maxBurstLength;
             sdebug(2, "opt.maxBurstLength=%d", sp->opt.maxBurstLength);
        }
   
        if(opt->targetAddress != NULL) {
             if(sp->opt.targetAddress != NULL)
                  free(sp->opt.targetAddress, M_ISC);
             sp->opt.targetAddress = i_strdupin(opt->targetAddress, 128);
             sdebug(2, "opt.targetAddress='%s'", sp->opt.targetAddress);
        }
        if(opt->targetName != NULL) {
             if(sp->opt.targetName != NULL)
                  free(sp->opt.targetName, M_ISC);
             sp->opt.targetName = i_strdupin(opt->targetName, 128);
             sdebug(2, "opt.targetName='%s'", sp->opt.targetName);
        }
        if(opt->initiatorName != NULL) {
             if(sp->opt.initiatorName != NULL)
                  free(sp->opt.initiatorName, M_ISC);
             sp->opt.initiatorName = i_strdupin(opt->initiatorName, 128);
             sdebug(2, "opt.initiatorName='%s'", sp->opt.initiatorName);
        }
   
        if(opt->maxluns > 0) {
             if(opt->maxluns > ISCSI_MAX_LUNS)
                  sp->opt.maxluns = ISCSI_MAX_LUNS; // silently chop it down ...
             sp->opt.maxluns = opt->maxluns;
             sdebug(2, "opt.maxluns=%d", sp->opt.maxluns);
        }
   
        if(opt->headerDigest != NULL) {
             sdebug(2, "opt.headerDigest='%s'", opt->headerDigest);
             if(strcmp(opt->headerDigest, "CRC32C") == 0) {
                  sp->hdrDigest = (digest_t *)i_crc32c;
                  sdebug(2, "opt.headerDigest set");
             }
        }
        if(opt->dataDigest != NULL) {
             sdebug(2, "opt.dataDigest='%s'", opt->headerDigest);
             if(strcmp(opt->dataDigest, "CRC32C") == 0) {
                  sp->dataDigest = (digest_t *)i_crc32c;
                  sdebug(2, "opt.dataDigest set");
             }
        }
   
        return 0;
   }
   
   void
   i_freeopt(isc_opt_t *opt)
   {
        debug_called(8);
   
        if(opt->targetAddress != NULL) {
             free(opt->targetAddress, M_ISC);
             opt->targetAddress = NULL;
        }
        if(opt->targetName != NULL) {
             free(opt->targetName, M_ISC);
             opt->targetName = NULL;
        }
        if(opt->initiatorName != NULL) {
             free(opt->initiatorName, M_ISC);
             opt->initiatorName = NULL;
        }
   }

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