static int iscsit_dataout_within_command_recovery_check(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct iscsi_conn *conn = cmd->conn;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
if (conn->sess->sess_ops->DataSequenceInOrder) {
if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) &&
(cmd->write_data_done != hdr->offset))
goto dump;
cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY;
} else {
struct iscsi_seq *seq;
seq = iscsit_get_seq_holder(cmd, hdr->offset, payload_length);
if (!seq)
return DATAOUT_CANNOT_RECOVER;
cmd->seq_ptr = seq;
if (conn->sess->sess_ops->DataPDUInOrder) {
if ((seq->status ==
DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY) &&
((seq->offset != hdr->offset) ||
(seq->data_sn != hdr->datasn)))
goto dump;
} else {
if ((seq->status ==
DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY) &&
(seq->data_sn != hdr->datasn))
goto dump;
}
if (seq->status == DATAOUT_SEQUENCE_COMPLETE)
goto dump;
if (seq->status != DATAOUT_SEQUENCE_COMPLETE)
seq->status = 0;
}
return DATAOUT_NORMAL;
dump:
pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:"
" 0x%08x\n", hdr->offset, payload_length, hdr->datasn);
return iscsit_dump_data_payload(conn, payload_length, 1);
}
static int iscsit_dataout_within_command_recovery_check(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct iscsi_conn *conn = cmd->conn;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
/*
* We do the within-command recovery checks here as it is
* the first function called in iscsi_check_pre_dataout().
* Basically, if we are in within-command recovery and
* the PDU does not contain the offset the sequence needs,
* dump the payload.
*
* This only applies to DataPDUInOrder=Yes, for
* DataPDUInOrder=No we only re-request the failed PDU
* and check that all PDUs in a sequence are received
* upon end of sequence.
*/
if (conn->sess->sess_ops->DataSequenceInOrder) {
if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) &&
cmd->write_data_done != be32_to_cpu(hdr->offset))
goto dump;
cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY;
} else {
struct iscsi_seq *seq;
seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
payload_length);
if (!seq)
return DATAOUT_CANNOT_RECOVER;
/*
* Set the struct iscsi_seq pointer to reuse later.
*/
cmd->seq_ptr = seq;
if (conn->sess->sess_ops->DataPDUInOrder) {
if (seq->status ==
DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
(seq->offset != be32_to_cpu(hdr->offset) ||
seq->data_sn != be32_to_cpu(hdr->datasn)))
goto dump;
} else {
if (seq->status ==
DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
seq->data_sn != be32_to_cpu(hdr->datasn))
goto dump;
}
if (seq->status == DATAOUT_SEQUENCE_COMPLETE)
goto dump;
if (seq->status != DATAOUT_SEQUENCE_COMPLETE)
seq->status = 0;
}
return DATAOUT_NORMAL;
dump:
pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:"
" 0x%08x\n", hdr->offset, payload_length, hdr->datasn);
return iscsit_dump_data_payload(conn, payload_length, 1);
}
static int iscsit_dataout_check_sequence(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
u32 next_burst_len;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_seq *seq = NULL;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
/*
* For DataSequenceInOrder=Yes: Check that the offset and offset+length
* is within range as defined by iscsi_set_dataout_sequence_values().
*
* For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for
* offset+length tuple.
*/
if (conn->sess->sess_ops->DataSequenceInOrder) {
/*
* Due to possibility of recovery DataOUT sent by the initiator
* fullfilling an Recovery R2T, it's best to just dump the
* payload here, instead of erroring out.
*/
if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
pr_err("Command ITT: 0x%08x with Offset: %u,"
" Length: %u outside of Sequence %u:%u while"
" DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
cmd->seq_end_offset);
if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
return DATAOUT_CANNOT_RECOVER;
return DATAOUT_WITHIN_COMMAND_RECOVERY;
}
next_burst_len = (cmd->next_burst_len + payload_length);
} else {
seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
payload_length);
if (!seq)
return DATAOUT_CANNOT_RECOVER;
/*
* Set the struct iscsi_seq pointer to reuse later.
*/
cmd->seq_ptr = seq;
if (seq->status == DATAOUT_SEQUENCE_COMPLETE) {
if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
return DATAOUT_CANNOT_RECOVER;
return DATAOUT_WITHIN_COMMAND_RECOVERY;
}
next_burst_len = (seq->next_burst_len + payload_length);
}
if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) {
pr_err("Command ITT: 0x%08x, NextBurstLength: %u and"
" Length: %u exceeds MaxBurstLength: %u. protocol"
" error.\n", cmd->init_task_tag,
(next_burst_len - payload_length),
payload_length, conn->sess->sess_ops->MaxBurstLength);
return DATAOUT_CANNOT_RECOVER;
}
/*
* Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
* checks for the current DataOUT Sequence.
*/
if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
/*
* Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
* sequence checks are handled in
* iscsit_dataout_datapduinorder_no_fbit().
*/
if (!conn->sess->sess_ops->DataPDUInOrder)
goto out;
if (conn->sess->sess_ops->DataSequenceInOrder) {
if ((next_burst_len <
conn->sess->sess_ops->MaxBurstLength) &&
((cmd->write_data_done + payload_length) <
cmd->se_cmd.data_length)) {
pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
" before end of DataOUT sequence, protocol"
" error.\n", cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
} else {
if (next_burst_len < seq->xfer_len) {
pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
" before end of DataOUT sequence, protocol"
" error.\n", cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
}
} else {
if (conn->sess->sess_ops->DataSequenceInOrder) {
if (next_burst_len ==
conn->sess->sess_ops->MaxBurstLength) {
pr_err("Command ITT: 0x%08x reached"
" MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is"
" not set, protocol error.", cmd->init_task_tag,
conn->sess->sess_ops->MaxBurstLength);
return DATAOUT_CANNOT_RECOVER;
}
if ((cmd->write_data_done + payload_length) ==
cmd->se_cmd.data_length) {
pr_err("Command ITT: 0x%08x reached"
" last DataOUT PDU in sequence but ISCSI_FLAG_"
"CMD_FINAL is not set, protocol error.\n",
cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
} else {
if (next_burst_len == seq->xfer_len) {
pr_err("Command ITT: 0x%08x reached"
" last DataOUT PDU in sequence but ISCSI_FLAG_"
"CMD_FINAL is not set, protocol error.\n",
cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
}
}
out:
return DATAOUT_NORMAL;
}
static int iscsit_dataout_check_sequence(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
u32 next_burst_len;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_seq *seq = NULL;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
if (conn->sess->sess_ops->DataSequenceInOrder) {
if ((hdr->offset < cmd->seq_start_offset) ||
((hdr->offset + payload_length) > cmd->seq_end_offset)) {
pr_err("Command ITT: 0x%08x with Offset: %u,"
" Length: %u outside of Sequence %u:%u while"
" DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
hdr->offset, payload_length, cmd->seq_start_offset,
cmd->seq_end_offset);
if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
return DATAOUT_CANNOT_RECOVER;
return DATAOUT_WITHIN_COMMAND_RECOVERY;
}
next_burst_len = (cmd->next_burst_len + payload_length);
} else {
seq = iscsit_get_seq_holder(cmd, hdr->offset, payload_length);
if (!seq)
return DATAOUT_CANNOT_RECOVER;
cmd->seq_ptr = seq;
if (seq->status == DATAOUT_SEQUENCE_COMPLETE) {
if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
return DATAOUT_CANNOT_RECOVER;
return DATAOUT_WITHIN_COMMAND_RECOVERY;
}
next_burst_len = (seq->next_burst_len + payload_length);
}
if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) {
pr_err("Command ITT: 0x%08x, NextBurstLength: %u and"
" Length: %u exceeds MaxBurstLength: %u. protocol"
" error.\n", cmd->init_task_tag,
(next_burst_len - payload_length),
payload_length, conn->sess->sess_ops->MaxBurstLength);
return DATAOUT_CANNOT_RECOVER;
}
if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
if (!conn->sess->sess_ops->DataPDUInOrder)
goto out;
if (conn->sess->sess_ops->DataSequenceInOrder) {
if ((next_burst_len <
conn->sess->sess_ops->MaxBurstLength) &&
((cmd->write_data_done + payload_length) <
cmd->data_length)) {
pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
" before end of DataOUT sequence, protocol"
" error.\n", cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
} else {
if (next_burst_len < seq->xfer_len) {
pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
" before end of DataOUT sequence, protocol"
" error.\n", cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
}
} else {
if (conn->sess->sess_ops->DataSequenceInOrder) {
if (next_burst_len ==
conn->sess->sess_ops->MaxBurstLength) {
pr_err("Command ITT: 0x%08x reached"
" MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is"
" not set, protocol error.", cmd->init_task_tag,
conn->sess->sess_ops->MaxBurstLength);
return DATAOUT_CANNOT_RECOVER;
}
if ((cmd->write_data_done + payload_length) ==
cmd->data_length) {
pr_err("Command ITT: 0x%08x reached"
" last DataOUT PDU in sequence but ISCSI_FLAG_"
"CMD_FINAL is not set, protocol error.\n",
cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
} else {
if (next_burst_len == seq->xfer_len) {
pr_err("Command ITT: 0x%08x reached"
" last DataOUT PDU in sequence but ISCSI_FLAG_"
"CMD_FINAL is not set, protocol error.\n",
cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
}
}
out:
return DATAOUT_NORMAL;
}
