iscsi-target: Move sendtargets parsing into iscsit_process_text_cmd

This patch moves ISCSI_OP_TEXT PDU buffer sanity checks to
iscsit_process_text_cmd() code, so that it can be shared
with iser-target code.

It adds IFC_SENDTARGETS_ALL + iscsi_cmd->text_in_ptr in order
to save text payload for ISCSI_OP_TEXT_RSP, and updates
iscsit_release_cmd() to assigned memory.

Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/iscsi/iscsi_target.c

@@ -1995,8 +1995,32 @@ int
 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 			struct iscsi_text *hdr)
 {
+	unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
 	int cmdsn_ret;
 
+	if (!text_in) {
+		pr_err("Unable to locate text_in buffer for sendtargets"
+		       " discovery\n");
+		goto reject;
+	}
+	if (strncmp("SendTargets", text_in, 11) != 0) {
+		pr_err("Received Text Data that is not"
+			" SendTargets, cannot continue.\n");
+		goto reject;
+	}
+	text_ptr = strchr(text_in, '=');
+	if (!text_ptr) {
+		pr_err("No \"=\" separator found in Text Data,"
+			"  cannot continue.\n");
+		goto reject;
+	}
+	if (!strncmp("=All", text_ptr, 4)) {
+		cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
+	} else {
+		pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
+		goto reject;
+	}
+
 	spin_lock_bh(&conn->cmd_lock);
 	list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 	spin_unlock_bh(&conn->cmd_lock);
@@ -2013,6 +2037,10 @@ iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 	}
 
 	return iscsit_execute_cmd(cmd, 0);
+
+reject:
+	return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
+					  0, 0, (unsigned char *)hdr, cmd);
 }
 EXPORT_SYMBOL(iscsit_process_text_cmd);
 
@@ -2031,7 +2059,6 @@ iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 
 	rx_size = payload_length;
 	if (payload_length) {
-		char *text_ptr;
 		u32 checksum = 0, data_crc = 0;
 		u32 padding = 0, pad_bytes = 0;
 		int niov = 0, rx_got;
@@ -2043,6 +2070,7 @@ iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 				" incoming text parameters\n");
 			goto reject;
 		}
+		cmd->text_in_ptr = text_in;
 
 		memset(iov, 0, 3 * sizeof(struct kvec));
 		iov[niov].iov_base	= text_in;
@@ -2101,30 +2129,13 @@ iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 		text_in[payload_length - 1] = '\0';
 		pr_debug("Successfully read %d bytes of text"
 				" data.\n", payload_length);
-
-		if (strncmp("SendTargets", text_in, 11) != 0) {
-			pr_err("Received Text Data that is not"
-				" SendTargets, cannot continue.\n");
-			goto reject;
-		}
-		text_ptr = strchr(text_in, '=');
-		if (!text_ptr) {
-			pr_err("No \"=\" separator found in Text Data,"
-				"  cannot continue.\n");
-			goto reject;
-		}
-		if (strncmp("=All", text_ptr, 4) != 0) {
-			pr_err("Unable to locate All value for"
-				" SendTargets key,  cannot continue.\n");
-			goto reject;
-		}
-		kfree(text_in);
 	}
 
 	return iscsit_process_text_cmd(conn, cmd, hdr);
 
 reject:
-	kfree(text_in);
+	kfree(cmd->text_in_ptr);
+	cmd->text_in_ptr = NULL;
 	return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
 					  0, 0, buf, cmd);
 }

drivers/target/iscsi/iscsi_target_core.h

@@ -133,6 +133,7 @@ enum cmd_flags_table {
 	ICF_ATTACHED_TO_RQUEUE			= 0x00000040,
 	ICF_OOO_CMDSN				= 0x00000080,
 	ICF_REJECT_FAIL_CONN			= 0x00000100,
+	IFC_SENDTARGETS_ALL			= 0x00000200,
 };
 
 /* struct iscsi_cmd->i_state */
@@ -427,6 +428,8 @@ struct iscsi_cmd {
 	u32			tx_size;
 	/* Buffer used for various purposes */
 	void			*buf_ptr;
+	/* Used by SendTargets=[iqn.,eui.] discovery */
+	void			*text_in_ptr;
 	/* See include/linux/dma-mapping.h */
 	enum dma_data_direction	data_direction;
 	/* iSCSI PDU Header + CRC */

drivers/target/iscsi/iscsi_target_util.c

@@ -681,6 +681,7 @@ void iscsit_release_cmd(struct iscsi_cmd *cmd)
 	kfree(cmd->seq_list);
 	kfree(cmd->tmr_req);
 	kfree(cmd->iov_data);
+	kfree(cmd->text_in_ptr);
 
 	kmem_cache_free(lio_cmd_cache, cmd);
 }