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iscsi-target: Reject unsupported multi PDU text command sequence

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This patch adds a check to reject text commands with F_BIT=0 ||
C_BIT=1, as multi PDU text command sequences are currently
unsupported.

This avoids the case where a text command received with F_BIT=0,
was generating a text response with F_BIT=1 which is a protocol
error according to RFC-3720 Section 10.11.1.

Reported-by: Arshad Hussain <arshad.hussain@calsoftinc.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2013-11-13 14:33:24 -08:00
parent 04d9cd1224
commit 122f8afcfb
1 changed files with 7 additions and 0 deletions
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7
drivers/target/iscsi/iscsi_target.c
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@ -1948,6 +1948,13 @@ iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
(unsigned char *)hdr); (unsigned char *)hdr);
} }
if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
pr_err("Multi sequence text commands currently not supported\n");
return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
(unsigned char *)hdr);
}
pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
" ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
hdr->exp_statsn, payload_length); hdr->exp_statsn, payload_length);