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ISID: Add helper functions to set any type of ISID value for the iscsi context.

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Let default be to create a 'random' ISID during context creation.
This commit is contained in:
Ronnie Sahlberg
2011-01-09 09:26:03 +11:00
parent b5d5370b8c
commit e312aa2ae0
2 changed files with 78 additions and 15 deletions
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33
include/iscsi.h
View File

@@ -15,12 +15,13 @@
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
struct iscsi_context;
struct sockaddr;
/*
* The following three functions are used to integrate libiscsi in an event
* system.
@@ -147,8 +148,8 @@ enum iscsi_session_type {
};
/*
* Set the session type for a scsi context.
* Session type can only be set/changed while the iscsi context is not
* logged in to a target.
* Session type can only be set/changed before the context
* is logged in to the target.
*
* Returns:
* 0: success
@@ -170,8 +171,8 @@ enum iscsi_header_digest {
/*
* Set the desired header digest for a scsi context.
* Header digest can only be set/changed while the iscsi context is not
* logged in to a target.
* Header digest can only be set/changed before the context
* is logged in to the target.
*
* Returns:
* 0: success
@@ -429,6 +430,24 @@ struct iscsi_data {
unsigned char *data;
};
/*
* These functions will set the ISID type and value.
* By default, contexts will automatically be assigned a 'random'
* type and value on creation, but this can be overridden
* by an appplication using these functions.
*
* Setting the ISID can only be done before loggin in to the target.
*/
int
iscsi_set_isid_oui(struct iscsi_context *iscsi, uint32_t oui, uint32_t qualifier);
int
iscsi_set_isid_en(struct iscsi_context *iscsi, uint32_t en, uint32_t qualifier);
int
iscsi_set_isid_random(struct iscsi_context *iscsi, uint32_t rnd, uint32_t qualifier);
int
iscsi_set_isid_reserved(struct iscsi_context *iscsi);
/*
* Async commands for SCSI
*/
@@ -494,5 +513,3 @@ struct scsi_task *
iscsi_synchronizecache10_sync(struct iscsi_context *iscsi, int lun, int lba,
int num_blocks, int syncnv, int immed);
int
iscsi_set_isid_random(struct iscsi_context *iscsi, int rnd);

60
lib/init.c
View File

@@ -55,7 +55,7 @@ iscsi_create_context(const char *initiator_name)
iscsi->fd = -1;
/* initialize to a "random" isid */
iscsi_set_isid_random(iscsi, getpid() ^ time(NULL));
iscsi_set_isid_random(iscsi, getpid() ^ time(NULL), 0);
/* assume we start in security negotiation phase */
iscsi->current_phase = ISCSI_PDU_LOGIN_CSG_SECNEG;
@@ -76,14 +76,60 @@ iscsi_create_context(const char *initiator_name)
}
int
iscsi_set_isid_random(struct iscsi_context *iscsi, int rnd)
iscsi_set_isid_oui(struct iscsi_context *iscsi, uint32_t oui, uint32_t qualifier)
{
iscsi->isid[0] = (oui >> 16) & 0x3f;
iscsi->isid[1] = (oui >> 8) & 0xff;
iscsi->isid[2] = (oui ) & 0xff;
iscsi->isid[3] = (qualifier >> 16) & 0xff;
iscsi->isid[4] = (qualifier >> 8) & 0xff;
iscsi->isid[5] = (qualifier ) & 0xff;
return 0;
}
int
iscsi_set_isid_en(struct iscsi_context *iscsi, uint32_t en, uint32_t qualifier)
{
iscsi->isid[0] = 0x40;
iscsi->isid[1] = (en >> 16) & 0xff;
iscsi->isid[2] = (en >> 8) & 0xff;
iscsi->isid[3] = (en ) & 0xff;
iscsi->isid[4] = (qualifier >> 8) & 0xff;
iscsi->isid[5] = (qualifier ) & 0xff;
return 0;
}
int
iscsi_set_isid_random(struct iscsi_context *iscsi, uint32_t rnd, uint32_t qualifier)
{
iscsi->isid[0] = 0x80;
iscsi->isid[1] = rnd&0xff;
iscsi->isid[2] = rnd&0xff;
iscsi->isid[3] = rnd&0xff;
iscsi->isid[4] = 0;
iscsi->isid[5] = 0;
iscsi->isid[1] = (rnd >> 16) & 0xff;
iscsi->isid[2] = (rnd >> 8) & 0xff;
iscsi->isid[3] = (rnd ) & 0xff;
iscsi->isid[4] = (qualifier >> 8) & 0xff;
iscsi->isid[5] = (qualifier ) & 0xff;
return 0;
}
int
iscsi_set_isid_reserved(struct iscsi_context *iscsi)
{
iscsi->isid[0] = 0xc0;
iscsi->isid[1] = 0x00;
iscsi->isid[2] = 0x00;
iscsi->isid[3] = 0x00;
iscsi->isid[4] = 0x00;
iscsi->isid[5] = 0x00;
return 0;
}