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>

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 1f79a16..30ca188 100644 (file)
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/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);
 }

diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h
index 60ec4b9..ad46e73 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_core.h
+++ b/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 */

diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c
index 08a3bac..fe712d6 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/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);
 }