nvmet: return DHCHAP status codes from nvmet_setup_auth()

A failure in nvmet_setup_auth() does not mean that the NVMe
authentication command failed, so we should rather return a protocol
error with a 'failure1' response than an NVMe status.

Also update the type used for dhchap_step and dhchap_status to u8 to
avoid confusions with nvme status. Furthermore, split dhchap_status and
nvme status so we don't accidentally mix these return values.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Hannes Reinecke <hare@suse.de>
[dwagner: - use u8 as type for dhchap_{step|status}
          - separate nvme status from dhcap_status]
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

1 files changed, 25 insertions, 24 deletions

diff --git a/drivers/nvme/target/fabrics-cmd-auth.c b/drivers/nvme/target/fabrics-cmd-auth.c
index eb7785be0ca7..d61b8c6ff3b2 100644
--- a/drivers/nvme/target/fabrics-cmd-auth.c
+++ b/drivers/nvme/target/fabrics-cmd-auth.c
@@ -31,7 +31,7 @@ void nvmet_auth_sq_init(struct nvmet_sq *sq)
 	sq->dhchap_step = NVME_AUTH_DHCHAP_MESSAGE_NEGOTIATE;
 }
 
-static u16 nvmet_auth_negotiate(struct nvmet_req *req, void *d)
+static u8 nvmet_auth_negotiate(struct nvmet_req *req, void *d)
 {
 	struct nvmet_ctrl *ctrl = req->sq->ctrl;
 	struct nvmf_auth_dhchap_negotiate_data *data = d;
@@ -109,7 +109,7 @@ static u16 nvmet_auth_negotiate(struct nvmet_req *req, void *d)
 	return 0;
 }
 
-static u16 nvmet_auth_reply(struct nvmet_req *req, void *d)
+static u8 nvmet_auth_reply(struct nvmet_req *req, void *d)
 {
 	struct nvmet_ctrl *ctrl = req->sq->ctrl;
 	struct nvmf_auth_dhchap_reply_data *data = d;
@@ -172,7 +172,7 @@ static u16 nvmet_auth_reply(struct nvmet_req *req, void *d)
 	return 0;
 }
 
-static u16 nvmet_auth_failure2(void *d)
+static u8 nvmet_auth_failure2(void *d)
 {
 	struct nvmf_auth_dhchap_failure_data *data = d;
 
@@ -186,6 +186,7 @@ void nvmet_execute_auth_send(struct nvmet_req *req)
 	void *d;
 	u32 tl;
 	u16 status = 0;
+	u8 dhchap_status;
 
 	if (req->cmd->auth_send.secp != NVME_AUTH_DHCHAP_PROTOCOL_IDENTIFIER) {
 		status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
@@ -237,30 +238,32 @@ void nvmet_execute_auth_send(struct nvmet_req *req)
 	if (data->auth_type == NVME_AUTH_COMMON_MESSAGES) {
 		if (data->auth_id == NVME_AUTH_DHCHAP_MESSAGE_NEGOTIATE) {
 			/* Restart negotiation */
-			pr_debug("%s: ctrl %d qid %d reset negotiation\n", __func__,
-				 ctrl->cntlid, req->sq->qid);
+			pr_debug("%s: ctrl %d qid %d reset negotiation\n",
+				 __func__, ctrl->cntlid, req->sq->qid);
 			if (!req->sq->qid) {
-				if (nvmet_setup_auth(ctrl) < 0) {
-					status = NVME_SC_INTERNAL;
-					pr_err("ctrl %d qid 0 failed to setup"
-					       "re-authentication",
+				dhchap_status = nvmet_setup_auth(ctrl);
+				if (dhchap_status) {
+					pr_err("ctrl %d qid 0 failed to setup re-authentication\n",
 					       ctrl->cntlid);
-					goto done_failure1;
+					req->sq->dhchap_status = dhchap_status;
+					req->sq->dhchap_step =
+						NVME_AUTH_DHCHAP_MESSAGE_FAILURE1;
+					goto done_kfree;
 				}
 			}
-			req->sq->dhchap_step = NVME_AUTH_DHCHAP_MESSAGE_NEGOTIATE;
+			req->sq->dhchap_step =
+				NVME_AUTH_DHCHAP_MESSAGE_NEGOTIATE;
 		} else if (data->auth_id != req->sq->dhchap_step)
 			goto done_failure1;
 		/* Validate negotiation parameters */
-		status = nvmet_auth_negotiate(req, d);
-		if (status == 0)
+		dhchap_status = nvmet_auth_negotiate(req, d);
+		if (dhchap_status == 0)
 			req->sq->dhchap_step =
 				NVME_AUTH_DHCHAP_MESSAGE_CHALLENGE;
 		else {
 			req->sq->dhchap_step =
 				NVME_AUTH_DHCHAP_MESSAGE_FAILURE1;
-			req->sq->dhchap_status = status;
-			status = 0;
+			req->sq->dhchap_status = dhchap_status;
 		}
 		goto done_kfree;
 	}
@@ -284,15 +287,14 @@ void nvmet_execute_auth_send(struct nvmet_req *req)
 
 	switch (data->auth_id) {
 	case NVME_AUTH_DHCHAP_MESSAGE_REPLY:
-		status = nvmet_auth_reply(req, d);
-		if (status == 0)
+		dhchap_status = nvmet_auth_reply(req, d);
+		if (dhchap_status == 0)
 			req->sq->dhchap_step =
 				NVME_AUTH_DHCHAP_MESSAGE_SUCCESS1;
 		else {
 			req->sq->dhchap_step =
 				NVME_AUTH_DHCHAP_MESSAGE_FAILURE1;
-			req->sq->dhchap_status = status;
-			status = 0;
+			req->sq->dhchap_status = dhchap_status;
 		}
 		goto done_kfree;
 	case NVME_AUTH_DHCHAP_MESSAGE_SUCCESS2:
@@ -301,13 +303,12 @@ void nvmet_execute_auth_send(struct nvmet_req *req)
 			 __func__, ctrl->cntlid, req->sq->qid);
 		goto done_kfree;
 	case NVME_AUTH_DHCHAP_MESSAGE_FAILURE2:
-		status = nvmet_auth_failure2(d);
-		if (status) {
+		dhchap_status = nvmet_auth_failure2(d);
+		if (dhchap_status) {
 			pr_warn("ctrl %d qid %d: authentication failed (%d)\n",
-				ctrl->cntlid, req->sq->qid, status);
-			req->sq->dhchap_status = status;
+				ctrl->cntlid, req->sq->qid, dhchap_status);
+			req->sq->dhchap_status = dhchap_status;
 			req->sq->authenticated = false;
-			status = 0;
 		}
 		goto done_kfree;
 	default: