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/ioccom.h>
50 #include <sys/queue.h>
51 #include <sys/kthread.h>
52 #include <sys/syslog.h>
53 #include <sys/mbuf.h>
54 #include <sys/libkern.h>
55 #include <sys/eventhandler.h>
56 #include <sys/mutex.h>
57 #include <sys/mutex2.h>
58 
59 #include <bus/cam/cam.h>
60 
61 #include "dev/disk/iscsi/initiator/iscsi.h"
62 #include "dev/disk/iscsi/initiator/iscsivar.h"
63 
64 static char *
65 i_strdupin(char *s, size_t maxlen)
66 {
67      size_t	len;
68      char	*p, *q;
69 
70      p = kmalloc(maxlen, M_ISCSI, M_WAITOK);
71      if(copyinstr(s, p, maxlen, &len)) {
72 	  kfree(p, M_ISCSI);
73 	  return NULL;
74      }
75      q = kmalloc(len, M_ISCSI, M_WAITOK);
76      bcopy(p, q, len);
77      kfree(p, M_ISCSI);
78 
79      return q;
80 }
81 
82 /*
83  | XXX: not finished coding
84  */
85 int
86 i_setopt(isc_session_t *sp, isc_opt_t *opt)
87 {
88      const int	digsize = 6;
89      size_t	len;
90      char	hdigest[digsize], ddigest[digsize];
91 
92      debug_called(8);
93      if(opt->maxRecvDataSegmentLength > 0) {
94 	  sp->opt.maxRecvDataSegmentLength = opt->maxRecvDataSegmentLength;
95 	  sdebug(2, "maxRecvDataSegmentLength=%d", sp->opt.maxRecvDataSegmentLength);
96      }
97      if(opt->maxXmitDataSegmentLength > 0) {
98 	  // danny's RFC
99 	  sp->opt.maxXmitDataSegmentLength = opt->maxXmitDataSegmentLength;
100 	  sdebug(2, "maXmitDataSegmentLength=%d", sp->opt.maxXmitDataSegmentLength);
101      }
102      if(opt->maxBurstLength != 0) {
103 	  sp->opt.maxBurstLength = opt->maxBurstLength;
104 	  sdebug(2, "maxBurstLength=%d", sp->opt.maxBurstLength);
105      }
106 
107      if(opt->targetAddress != NULL) {
108 	  if(sp->opt.targetAddress != NULL)
109 	       kfree(sp->opt.targetAddress, M_ISCSI);
110 	  sp->opt.targetAddress = i_strdupin(opt->targetAddress, 128);
111 	  sdebug(4, "opt.targetAddress='%s'", sp->opt.targetAddress);
112      }
113      if(opt->targetName != NULL) {
114 	  if(sp->opt.targetName != NULL)
115 	       kfree(sp->opt.targetName, M_ISCSI);
116 	  sp->opt.targetName = i_strdupin(opt->targetName, 128);
117 	  sdebug(4, "opt.targetName='%s'", sp->opt.targetName);
118      }
119      if(opt->initiatorName != NULL) {
120 	  if(sp->opt.initiatorName != NULL)
121 	       kfree(sp->opt.initiatorName, M_ISCSI);
122 	  sp->opt.initiatorName = i_strdupin(opt->initiatorName, 128);
123 	  sdebug(4, "opt.initiatorName='%s'", sp->opt.initiatorName);
124      }
125 
126      if(opt->maxluns > 0) {
127 	  if(opt->maxluns > ISCSI_MAX_LUNS)
128 	       sp->opt.maxluns = ISCSI_MAX_LUNS; // silently chop it down ...
129 	  sp->opt.maxluns = opt->maxluns;
130 	  sdebug(4, "opt.maxluns=%d", sp->opt.maxluns);
131      }
132 
133      /* Try to copy the userland pointer containing the header digest */
134      if(opt->headerDigest != NULL) {
135 	  if ((copyinstr(opt->headerDigest, &hdigest, digsize, &len)) != EFAULT) {
136 	       sdebug(2, "opt.headerDigest='%s'", hdigest);
137 	       if(strcmp(hdigest, "CRC32C") == 0) {
138 		    sp->hdrDigest = (digest_t *)crc32_ext;
139 		    sdebug(2, "headerDigest set");
140 	       }
141 	  }
142      }
143      /* Try to copy the userland pointer containing the data digest */
144      if(opt->dataDigest != NULL) {
145 	  if ((copyinstr(opt->dataDigest, &ddigest, digsize, &len)) != EFAULT) {
146 	       if (strcmp(ddigest, "CRC32C") == 0) {
147 		    sp->dataDigest = (digest_t *)crc32_ext;
148 		    sdebug(2, "dataDigest set");
149 	       }
150 	  }
151      }
152 
153      return 0;
154 }
155 
156 void
157 i_freeopt(isc_opt_t *opt)
158 {
159      if(opt->targetAddress != NULL) {
160 	  kfree(opt->targetAddress, M_ISCSI);
161 	  opt->targetAddress = NULL;
162      }
163      if(opt->targetName != NULL) {
164 	  kfree(opt->targetName, M_ISCSI);
165 	  opt->targetName = NULL;
166      }
167      if(opt->initiatorName != NULL) {
168 	  kfree(opt->initiatorName, M_ISCSI);
169 	  opt->initiatorName = NULL;
170      }
171 }
172