1 /*-
2  * Copyright (c) 2005-2008 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  * $FreeBSD: src/sys/dev/iscsi/initiator/isc_subr.c,v 1.3 2009/02/14 11:34:57 rrs Exp $
27  */
28 /*
29  | iSCSI
30  | $Id: isc_subr.c,v 1.20 2006/12/01 09:10:17 danny Exp danny $
31  */
32 
33 #include "opt_iscsi_initiator.h"
34 
35 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/conf.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
40 #include <sys/ctype.h>
41 #include <sys/errno.h>
42 #include <sys/sysctl.h>
43 #include <sys/file.h>
44 #include <sys/uio.h>
45 #include <sys/socketvar.h>
46 #include <sys/socket.h>
47 #include <sys/protosw.h>
48 #include <sys/proc.h>
49 #include <sys/queue.h>
50 #include <sys/kthread.h>
51 #include <sys/syslog.h>
52 #include <sys/mbuf.h>
53 #include <sys/libkern.h>
54 #include <sys/eventhandler.h>
55 
56 #include <bus/cam/cam.h>
57 
58 #include "dev/disk/iscsi/initiator/iscsi.h"
59 #include "dev/disk/iscsi/initiator/iscsivar.h"
60 
61 static char *
62 i_strdupin(char *s, size_t maxlen)
63 {
64      size_t	len;
65      char	*p, *q;
66 
67      p = kmalloc(maxlen, M_ISCSI, M_WAITOK);
68      if(copyinstr(s, p, maxlen, &len)) {
69 	  kfree(p, M_ISCSI);
70 	  return NULL;
71      }
72      q = kmalloc(len, M_ISCSI, M_WAITOK);
73      bcopy(p, q, len);
74      kfree(p, M_ISCSI);
75 
76      return q;
77 }
78 
79 /*
80  | XXX: not finished coding
81  */
82 int
83 i_setopt(isc_session_t *sp, isc_opt_t *opt)
84 {
85      const int	digsize = 6;
86      size_t	len;
87      char	hdigest[digsize], ddigest[digsize];
88 
89      debug_called(8);
90      if(opt->maxRecvDataSegmentLength > 0) {
91 	  sp->opt.maxRecvDataSegmentLength = opt->maxRecvDataSegmentLength;
92 	  sdebug(2, "maxRecvDataSegmentLength=%d", sp->opt.maxRecvDataSegmentLength);
93      }
94      if(opt->maxXmitDataSegmentLength > 0) {
95 	  // danny's RFC
96 	  sp->opt.maxXmitDataSegmentLength = opt->maxXmitDataSegmentLength;
97 	  sdebug(2, "maXmitDataSegmentLength=%d", sp->opt.maxXmitDataSegmentLength);
98      }
99      if(opt->maxBurstLength != 0) {
100 	  sp->opt.maxBurstLength = opt->maxBurstLength;
101 	  sdebug(2, "maxBurstLength=%d", sp->opt.maxBurstLength);
102      }
103 
104      if(opt->targetAddress != NULL) {
105 	  if(sp->opt.targetAddress != NULL)
106 	       kfree(sp->opt.targetAddress, M_ISCSI);
107 	  sp->opt.targetAddress = i_strdupin(opt->targetAddress, 128);
108 	  sdebug(4, "opt.targetAddress='%s'", sp->opt.targetAddress);
109      }
110      if(opt->targetName != NULL) {
111 	  if(sp->opt.targetName != NULL)
112 	       kfree(sp->opt.targetName, M_ISCSI);
113 	  sp->opt.targetName = i_strdupin(opt->targetName, 128);
114 	  sdebug(4, "opt.targetName='%s'", sp->opt.targetName);
115      }
116      if(opt->initiatorName != NULL) {
117 	  if(sp->opt.initiatorName != NULL)
118 	       kfree(sp->opt.initiatorName, M_ISCSI);
119 	  sp->opt.initiatorName = i_strdupin(opt->initiatorName, 128);
120 	  sdebug(4, "opt.initiatorName='%s'", sp->opt.initiatorName);
121      }
122 
123      if(opt->maxluns > 0) {
124 	  if(opt->maxluns > ISCSI_MAX_LUNS)
125 	       sp->opt.maxluns = ISCSI_MAX_LUNS; // silently chop it down ...
126 	  sp->opt.maxluns = opt->maxluns;
127 	  sdebug(4, "opt.maxluns=%d", sp->opt.maxluns);
128      }
129 
130      /* Try to copy the userland pointer containing the header digest */
131      if(opt->headerDigest != NULL) {
132 	  if ((copyinstr(opt->headerDigest, &hdigest, digsize, &len)) != EFAULT) {
133 	       sdebug(2, "opt.headerDigest='%s'", hdigest);
134 	       if(strcmp(hdigest, "CRC32C") == 0) {
135 		    sp->hdrDigest = (digest_t *)crc32_ext;
136 		    sdebug(2, "headerDigest set");
137 	       }
138 	  }
139      }
140      /* Try to copy the userland pointer containing the data digest */
141      if(opt->dataDigest != NULL) {
142 	  if ((copyinstr(opt->dataDigest, &ddigest, digsize, &len)) != EFAULT) {
143 	       if (strcmp(ddigest, "CRC32C") == 0) {
144 		    sp->dataDigest = (digest_t *)crc32_ext;
145 		    sdebug(2, "dataDigest set");
146 	       }
147 	  }
148      }
149 
150      return 0;
151 }
152 
153 void
154 i_freeopt(isc_opt_t *opt)
155 {
156      if(opt->targetAddress != NULL) {
157 	  kfree(opt->targetAddress, M_ISCSI);
158 	  opt->targetAddress = NULL;
159      }
160      if(opt->targetName != NULL) {
161 	  kfree(opt->targetName, M_ISCSI);
162 	  opt->targetName = NULL;
163      }
164      if(opt->initiatorName != NULL) {
165 	  kfree(opt->initiatorName, M_ISCSI);
166 	  opt->initiatorName = NULL;
167      }
168 }
169