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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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iscsi-target: Refactor ISCSI_OP_TEXT RX handling
This patch refactors ISCSI_OP_TEXT handling within iscsi-target in order to handle iscsi_text payloads in a transport specific manner. This includes splitting current iscsit_handle_text_cmd() into iscsit_setup_text_cmd() and iscsit_process_text_cmd() calls, and makes iscsit_handle_text_cmd be only used internally by traditional iscsi socket calls. Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
parent
778de36896
commit
64534aa794
2 changed files with 94 additions and 68 deletions
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@ -1960,45 +1960,93 @@ iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
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EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
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/* #warning FIXME: Support Text Command parameters besides SendTargets */
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static int iscsit_handle_text_cmd(
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struct iscsi_conn *conn,
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unsigned char *buf)
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int
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iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
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struct iscsi_text *hdr)
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{
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char *text_ptr, *text_in;
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int cmdsn_ret, niov = 0, rx_got, rx_size;
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u32 checksum = 0, data_crc = 0, payload_length;
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u32 padding = 0, pad_bytes = 0, text_length = 0;
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struct iscsi_cmd *cmd;
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struct kvec iov[3];
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struct iscsi_text *hdr;
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hdr = (struct iscsi_text *) buf;
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payload_length = ntoh24(hdr->dlength);
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u32 payload_length = ntoh24(hdr->dlength);
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if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
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pr_err("Unable to accept text parameter length: %u"
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"greater than MaxXmitDataSegmentLength %u.\n",
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payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
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return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
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buf, conn);
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return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
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1, 0, (unsigned char *)hdr, cmd);
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}
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pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
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" ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
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hdr->exp_statsn, payload_length);
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rx_size = text_length = payload_length;
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if (text_length) {
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text_in = kzalloc(text_length, GFP_KERNEL);
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cmd->iscsi_opcode = ISCSI_OP_TEXT;
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cmd->i_state = ISTATE_SEND_TEXTRSP;
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cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
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conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
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cmd->targ_xfer_tag = 0xFFFFFFFF;
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cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
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cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
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cmd->data_direction = DMA_NONE;
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return 0;
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}
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EXPORT_SYMBOL(iscsit_setup_text_cmd);
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int
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iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
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struct iscsi_text *hdr)
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{
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int cmdsn_ret;
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spin_lock_bh(&conn->cmd_lock);
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list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
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spin_unlock_bh(&conn->cmd_lock);
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iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
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if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
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cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
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if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
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return iscsit_add_reject_from_cmd(
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ISCSI_REASON_PROTOCOL_ERROR,
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1, 0, (unsigned char *)hdr, cmd);
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return 0;
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}
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return iscsit_execute_cmd(cmd, 0);
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}
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EXPORT_SYMBOL(iscsit_process_text_cmd);
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static int
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iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
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unsigned char *buf)
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{
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struct iscsi_text *hdr = (struct iscsi_text *)buf;
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char *text_in = NULL;
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u32 payload_length = ntoh24(hdr->dlength);
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int rx_size, rc;
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rc = iscsit_setup_text_cmd(conn, cmd, hdr);
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if (rc < 0)
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return rc;
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rx_size = payload_length;
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if (payload_length) {
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char *text_ptr;
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u32 checksum = 0, data_crc = 0;
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u32 padding = 0, pad_bytes = 0;
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int niov = 0, rx_got;
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struct kvec iov[3];
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text_in = kzalloc(payload_length, GFP_KERNEL);
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if (!text_in) {
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pr_err("Unable to allocate memory for"
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" incoming text parameters\n");
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return -1;
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goto reject;
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}
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memset(iov, 0, 3 * sizeof(struct kvec));
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iov[niov].iov_base = text_in;
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iov[niov++].iov_len = text_length;
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iov[niov++].iov_len = payload_length;
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padding = ((-payload_length) & 3);
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if (padding != 0) {
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@ -2015,14 +2063,12 @@ static int iscsit_handle_text_cmd(
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}
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rx_got = rx_data(conn, &iov[0], niov, rx_size);
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if (rx_got != rx_size) {
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kfree(text_in);
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return -1;
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}
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if (rx_got != rx_size)
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goto reject;
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if (conn->conn_ops->DataDigest) {
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iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
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text_in, text_length,
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text_in, payload_length,
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padding, (u8 *)&pad_bytes,
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(u8 *)&data_crc);
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@ -2034,8 +2080,7 @@ static int iscsit_handle_text_cmd(
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pr_err("Unable to recover from"
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" Text Data digest failure while in"
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" ERL=0.\n");
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kfree(text_in);
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return -1;
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goto reject;
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} else {
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/*
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* Silently drop this PDU and let the
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@ -2050,68 +2095,40 @@ static int iscsit_handle_text_cmd(
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} else {
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pr_debug("Got CRC32C DataDigest"
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" 0x%08x for %u bytes of text data.\n",
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checksum, text_length);
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checksum, payload_length);
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}
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}
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text_in[text_length - 1] = '\0';
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text_in[payload_length - 1] = '\0';
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pr_debug("Successfully read %d bytes of text"
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" data.\n", text_length);
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" data.\n", payload_length);
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if (strncmp("SendTargets", text_in, 11) != 0) {
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pr_err("Received Text Data that is not"
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" SendTargets, cannot continue.\n");
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kfree(text_in);
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return -1;
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goto reject;
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}
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text_ptr = strchr(text_in, '=');
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if (!text_ptr) {
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pr_err("No \"=\" separator found in Text Data,"
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" cannot continue.\n");
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kfree(text_in);
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return -1;
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goto reject;
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}
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if (strncmp("=All", text_ptr, 4) != 0) {
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pr_err("Unable to locate All value for"
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" SendTargets key, cannot continue.\n");
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kfree(text_in);
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return -1;
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goto reject;
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}
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/*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
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kfree(text_in);
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}
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cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
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if (!cmd)
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return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
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1, buf, conn);
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return iscsit_process_text_cmd(conn, cmd, hdr);
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cmd->iscsi_opcode = ISCSI_OP_TEXT;
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cmd->i_state = ISTATE_SEND_TEXTRSP;
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cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
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conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
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cmd->targ_xfer_tag = 0xFFFFFFFF;
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cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
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cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
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cmd->data_direction = DMA_NONE;
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spin_lock_bh(&conn->cmd_lock);
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list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
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spin_unlock_bh(&conn->cmd_lock);
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iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
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if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
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cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
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if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
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return iscsit_add_reject_from_cmd(
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ISCSI_REASON_PROTOCOL_ERROR,
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1, 0, buf, cmd);
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return 0;
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}
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return iscsit_execute_cmd(cmd, 0);
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reject:
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kfree(text_in);
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return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
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0, 0, buf, cmd);
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}
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EXPORT_SYMBOL(iscsit_handle_text_cmd);
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int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
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{
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ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
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break;
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case ISCSI_OP_TEXT:
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ret = iscsit_handle_text_cmd(conn, buf);
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cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
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if (!cmd)
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return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
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1, buf, conn);
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ret = iscsit_handle_text_cmd(conn, cmd, buf);
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break;
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case ISCSI_OP_LOGOUT:
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cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
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@ -53,6 +53,10 @@ extern int iscsit_handle_logout_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *);
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extern int iscsit_handle_task_mgt_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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unsigned char *);
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extern int iscsit_setup_text_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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struct iscsi_text *);
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extern int iscsit_process_text_cmd(struct iscsi_conn *, struct iscsi_cmd *,
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struct iscsi_text *);
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extern void iscsit_build_rsp_pdu(struct iscsi_cmd *, struct iscsi_conn *,
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bool, struct iscsi_scsi_rsp *);
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extern void iscsit_build_nopin_rsp(struct iscsi_cmd *, struct iscsi_conn *,
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