iscsi_target_nego.c

	}

	memcpy(tmpbuf, login->req_buf, payload_length);
	tmpbuf[payload_length] = '\0';
	start = tmpbuf;
	end = (start + payload_length);

	/*
	 * Locate the initial keys expected from the Initiator node in
	 * the first login request in order to progress with the login phase.
	 */
	while (start < end) {
		if (iscsi_extract_key_value(start, &key, &value) < 0) {
			ret = -1;
			goto out;
		}

		if (!strncmp(key, "InitiatorName", 13))
			i_buf = value;
		else if (!strncmp(key, "SessionType", 11))
			s_buf = value;
		else if (!strncmp(key, "TargetName", 10))
			t_buf = value;

		start += strlen(key) + strlen(value) + 2;
	}
	/*
	 * See 5.3.  Login Phase.
	 */
	if (!i_buf) {
		pr_err("InitiatorName key not received"
			" in first login request.\n");
		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
			ISCSI_LOGIN_STATUS_MISSING_FIELDS);
		ret = -1;
		goto out;
	}
	/*
	 * Convert the incoming InitiatorName to lowercase following
	 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
	 * are NOT case sensitive.
	 */
	iscsi_initiatorname_tolower(i_buf);

	if (!s_buf) {
		if (!login->leading_connection)
			goto get_target;

		pr_err("SessionType key not received"
			" in first login request.\n");
		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
			ISCSI_LOGIN_STATUS_MISSING_FIELDS);
		ret = -1;
		goto out;
	}

	/*
	 * Use default portal group for discovery sessions.
	 */
	sessiontype = strncmp(s_buf, DISCOVERY, 9);
	if (!sessiontype) {
		conn->tpg = iscsit_global->discovery_tpg;
		if (!login->leading_connection)
			goto get_target;

		sess->sess_ops->SessionType = 1;
		/*
		 * Setup crc32c modules from libcrypto
		 */
		if (iscsi_login_setup_crypto(conn) < 0) {
			pr_err("iscsi_login_setup_crypto() failed\n");
			ret = -1;
			goto out;
		}
		/*
		 * Serialize access across the discovery struct iscsi_portal_group to
		 * process login attempt.
		 */
		if (iscsit_access_np(np, conn->tpg) < 0) {
			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
				ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
			ret = -1;
			goto out;
		}
		ret = 0;
		goto alloc_tags;
	}

get_target:
	if (!t_buf) {
		pr_err("TargetName key not received"
			" in first login request while"
			" SessionType=Normal.\n");
		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
			ISCSI_LOGIN_STATUS_MISSING_FIELDS);
		ret = -1;
		goto out;
	}

	/*
	 * Locate Target IQN from Storage Node.
	 */
	tiqn = iscsit_get_tiqn_for_login(t_buf);
	if (!tiqn) {
		pr_err("Unable to locate Target IQN: %s in"
			" Storage Node\n", t_buf);
		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
				ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
		ret = -1;
		goto out;
	}
	pr_debug("Located Storage Object: %s\n", tiqn->tiqn);

	/*
	 * Locate Target Portal Group from Storage Node.
	 */
	conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
	if (!conn->tpg) {
		pr_err("Unable to locate Target Portal Group"
				" on %s\n", tiqn->tiqn);
		iscsit_put_tiqn_for_login(tiqn);
		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
				ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
		ret = -1;
		goto out;
	}
	conn->tpg_np = tpg_np;
	pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
	/*
	 * Setup crc32c modules from libcrypto
	 */
	if (iscsi_login_setup_crypto(conn) < 0) {
		pr_err("iscsi_login_setup_crypto() failed\n");
		kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
		iscsit_put_tiqn_for_login(tiqn);
		conn->tpg = NULL;
		ret = -1;
		goto out;
	}
	/*
	 * Serialize access across the struct iscsi_portal_group to
	 * process login attempt.
	 */
	if (iscsit_access_np(np, conn->tpg) < 0) {
		kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
		iscsit_put_tiqn_for_login(tiqn);
		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
				ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
		conn->tpg = NULL;
		ret = -1;
		goto out;
	}

	/*
	 * conn->sess->node_acl will be set when the referenced
	 * struct iscsi_session is located from received ISID+TSIH in
	 * iscsi_login_non_zero_tsih_s2().
	 */
	if (!login->leading_connection) {
		ret = 0;
		goto out;
	}

	/*
	 * This value is required in iscsi_login_zero_tsih_s2()
	 */
	sess->sess_ops->SessionType = 0;

	/*
	 * Locate incoming Initiator IQN reference from Storage Node.
	 */
	sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
			&conn->tpg->tpg_se_tpg, i_buf);
	if (!sess->se_sess->se_node_acl) {
		pr_err("iSCSI Initiator Node: %s is not authorized to"
			" access iSCSI target portal group: %hu.\n",
				i_buf, conn->tpg->tpgt);
		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
				ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
		ret = -1;
		goto out;
	}
	se_nacl = sess->se_sess->se_node_acl;
	queue_depth = se_nacl->queue_depth;
	/*
	 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
	 * depth for non immediate commands, plus extra tags for immediate
	 * commands.
	 *
	 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
	 * in per-cpu-ida tag allocation logic + small queue_depth.
	 */
alloc_tags:
	tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
	tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
	tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;

	ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
	if (ret < 0) {
		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
				    ISCSI_LOGIN_STATUS_NO_RESOURCES);
		ret = -1;
	}
out:
	kfree(tmpbuf);
	return ret;
}

int iscsi_target_start_negotiation(
	struct iscsi_login *login,
	struct iscsi_conn *conn)
{
	int ret;

	ret = iscsi_target_do_login(conn, login);
	if (!ret) {
		if (conn->sock) {
			struct sock *sk = conn->sock->sk;

			write_lock_bh(&sk->sk_callback_lock);
			set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
			write_unlock_bh(&sk->sk_callback_lock);
		}
	} else if (ret < 0) {
		cancel_delayed_work_sync(&conn->login_work);
		cancel_delayed_work_sync(&conn->login_cleanup_work);
		iscsi_target_restore_sock_callbacks(conn);
		iscsi_remove_failed_auth_entry(conn);
	}
	if (ret != 0)
		iscsi_target_nego_release(conn);

	return ret;
}

void iscsi_target_nego_release(struct iscsi_conn *conn)
{
	struct iscsi_login *login = conn->conn_login;

	if (!login)
		return;

	kfree(login->req_buf);
	kfree(login->rsp_buf);
	kfree(login);

	conn->conn_login = NULL;
}