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PDU avoid incrementing itt to 0xffffffff

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This patch avoid incrementing itt to 0xffffffff which is
a reserved value for immediate pdus. Avoid incrementing
it to 0xfffffff to avoid unexpected behaviour.

Signed-off-by: Peter Lieven <pl@kamp.de>
This commit is contained in:
Peter Lieven
2012-11-28 10:58:33 +01:00
parent cd09c0f17d
commit 562dd46833
4 changed files with 20 additions and 5 deletions
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3
include/iscsi-private.h
View File

@@ -328,6 +328,9 @@ iscsi_add_to_outqueue(struct iscsi_context *iscsi, struct iscsi_pdu *pdu);
int
iscsi_serial32_compare(u_int32_t s1, u_int32_t s2);
u_int32_t
iscsi_itt_post_increment(struct iscsi_context *iscsi);
#ifdef __cplusplus
}
#endif

4
lib/connect.c
View File

@@ -279,7 +279,7 @@ try_again:
continue;
}
pdu->itt = iscsi->itt++;
pdu->itt = iscsi_itt_post_increment(iscsi);
iscsi_pdu_set_itt(pdu, pdu->itt);
pdu->cmdsn = iscsi->cmdsn++;
@@ -309,7 +309,7 @@ try_again:
continue;
}
pdu->itt = iscsi->itt++;
pdu->itt = iscsi_itt_post_increment(iscsi);
iscsi_pdu_set_itt(pdu, pdu->itt);
pdu->cmdsn = iscsi->cmdsn++;

2
lib/login.c
View File

@@ -1067,7 +1067,7 @@ iscsi_process_login_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
if ((in->hdr[1] & ISCSI_PDU_LOGIN_TRANSIT)
&& (in->hdr[1] & ISCSI_PDU_LOGIN_NSG_FF) == ISCSI_PDU_LOGIN_NSG_FF) {
iscsi->is_loggedin = 1;
iscsi->itt++;
iscsi_itt_post_increment(iscsi);
iscsi->header_digest = iscsi->want_header_digest;
ISCSI_LOG(iscsi, 2, "login successful");
pdu->callback(iscsi, SCSI_STATUS_GOOD, NULL, pdu->private_data);

16
lib/pdu.c
View File

@@ -48,6 +48,18 @@ iscsi_serial32_compare(u_int32_t s1, u_int32_t s2) {
return -1;
}
u_int32_t
iscsi_itt_post_increment(struct iscsi_context *iscsi) {
u_int32_t old_itt = iscsi->itt;
iscsi->itt++;
/* 0xffffffff is a reserved value */
if (iscsi->itt == 0xffffffff) {
iscsi->itt = 0;
}
return old_itt;
}
struct iscsi_pdu *
iscsi_allocate_pdu_with_itt_flags_size(struct iscsi_context *iscsi, enum iscsi_opcode opcode,
enum iscsi_opcode response_opcode, uint32_t itt, uint32_t flags, size_t payload_size)
@@ -107,14 +119,14 @@ struct iscsi_pdu *
iscsi_allocate_pdu(struct iscsi_context *iscsi, enum iscsi_opcode opcode,
enum iscsi_opcode response_opcode)
{
return iscsi_allocate_pdu_with_itt_flags(iscsi, opcode, response_opcode, iscsi->itt++, 0);
return iscsi_allocate_pdu_with_itt_flags(iscsi, opcode, response_opcode, iscsi_itt_post_increment(iscsi), 0);
}
struct iscsi_pdu *
iscsi_allocate_pdu_size(struct iscsi_context *iscsi, enum iscsi_opcode opcode,
enum iscsi_opcode response_opcode, size_t payload_size)
{
return iscsi_allocate_pdu_with_itt_flags_size(iscsi, opcode, response_opcode, iscsi->itt++, 0, payload_size);
return iscsi_allocate_pdu_with_itt_flags_size(iscsi, opcode, response_opcode, iscsi_itt_post_increment(iscsi), 0, payload_size);
}