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iscsi-target: Do not generate REJECTs for zero-length DataOUT 

This patch changes iscsit_check_dataout_hdr() to no longer generate
REJECTs for zero-length DataOUTs, and instead simply ignore these
requests.

This follows RFC-3720, Section 10.7.7.  DataSegmentLength

  "This is the data payload length of a SCSI Data-In or SCSI Data-Out PDU.
   The sending of 0 length data segments should be avoided, but initiators
   and targets MUST be able to properly receive 0 length data segments."

Reported-by: Santosh Kulkarni <santosh.kulkarni@calsoftinc.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2013-11-06 20:55:39 -08:00
parent 95b60f0788
commit dbcbc95cd8
1 changed files with 3 additions and 4 deletions
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7
drivers/target/iscsi/iscsi_target.c
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@ -1249,9 +1249,8 @@ iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
int rc;
if (!payload_length) {
pr_err("DataOUT payload is ZERO, protocol error.\n");
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
pr_warn("DataOUT payload is ZERO, ignoring.\n");
return 0;
}
/* iSCSI write */
@ -1481,7 +1480,7 @@ EXPORT_SYMBOL(iscsit_check_dataout_payload);
static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
{
struct iscsi_cmd *cmd;
struct iscsi_cmd *cmd = NULL;
struct iscsi_data *hdr = (struct iscsi_data *)buf;
int rc;
bool data_crc_failed = false;