libnvdimm/security: Consolidate 'security' operations

The security operations are exported from libnvdimm/security.c to
libnvdimm/dimm_devs.c, and libnvdimm/security.c is optionally compiled
based on the CONFIG_NVDIMM_KEYS config symbol.

Rather than export the operations across compile objects, just move the
__security_store() entry point to live with the helpers.

Acked-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/156686730515.184120.10522747907309996674.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 86 insertions, 4 deletions

diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c
index 2166e627383a..9e45b207ff01 100644
--- a/drivers/nvdimm/security.c
+++ b/drivers/nvdimm/security.c
@@ -235,7 +235,7 @@ static int check_security_state(struct nvdimm *nvdimm)
 	return 0;
 }
 
-int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid)
+static int security_disable(struct nvdimm *nvdimm, unsigned int keyid)
 {
 	struct device *dev = &nvdimm->dev;
 	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
@@ -268,7 +268,7 @@ int nvdimm_security_disable(struct nvdimm *nvdimm, unsigned int keyid)
 	return rc;
 }
 
-int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid,
+static int security_update(struct nvdimm *nvdimm, unsigned int keyid,
 		unsigned int new_keyid,
 		enum nvdimm_passphrase_type pass_type)
 {
@@ -318,7 +318,7 @@ int nvdimm_security_update(struct nvdimm *nvdimm, unsigned int keyid,
 	return rc;
 }
 
-int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid,
+static int security_erase(struct nvdimm *nvdimm, unsigned int keyid,
 		enum nvdimm_passphrase_type pass_type)
 {
 	struct device *dev = &nvdimm->dev;
@@ -360,7 +360,7 @@ int nvdimm_security_erase(struct nvdimm *nvdimm, unsigned int keyid,
 	return rc;
 }
 
-int nvdimm_security_overwrite(struct nvdimm *nvdimm, unsigned int keyid)
+static int security_overwrite(struct nvdimm *nvdimm, unsigned int keyid)
 {
 	struct device *dev = &nvdimm->dev;
 	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
@@ -465,3 +465,85 @@ void nvdimm_security_overwrite_query(struct work_struct *work)
 	__nvdimm_security_overwrite_query(nvdimm);
 	nvdimm_bus_unlock(&nvdimm->dev);
 }
+
+#define OPS							\
+	C( OP_FREEZE,		"freeze",		1),	\
+	C( OP_DISABLE,		"disable",		2),	\
+	C( OP_UPDATE,		"update",		3),	\
+	C( OP_ERASE,		"erase",		2),	\
+	C( OP_OVERWRITE,	"overwrite",		2),	\
+	C( OP_MASTER_UPDATE,	"master_update",	3),	\
+	C( OP_MASTER_ERASE,	"master_erase",		2)
+#undef C
+#define C(a, b, c) a
+enum nvdimmsec_op_ids { OPS };
+#undef C
+#define C(a, b, c) { b, c }
+static struct {
+	const char *name;
+	int args;
+} ops[] = { OPS };
+#undef C
+
+#define SEC_CMD_SIZE 32
+#define KEY_ID_SIZE 10
+
+ssize_t nvdimm_security_store(struct device *dev, const char *buf, size_t len)
+{
+	struct nvdimm *nvdimm = to_nvdimm(dev);
+	ssize_t rc;
+	char cmd[SEC_CMD_SIZE+1], keystr[KEY_ID_SIZE+1],
+		nkeystr[KEY_ID_SIZE+1];
+	unsigned int key, newkey;
+	int i;
+
+	rc = sscanf(buf, "%"__stringify(SEC_CMD_SIZE)"s"
+			" %"__stringify(KEY_ID_SIZE)"s"
+			" %"__stringify(KEY_ID_SIZE)"s",
+			cmd, keystr, nkeystr);
+	if (rc < 1)
+		return -EINVAL;
+	for (i = 0; i < ARRAY_SIZE(ops); i++)
+		if (sysfs_streq(cmd, ops[i].name))
+			break;
+	if (i >= ARRAY_SIZE(ops))
+		return -EINVAL;
+	if (ops[i].args > 1)
+		rc = kstrtouint(keystr, 0, &key);
+	if (rc >= 0 && ops[i].args > 2)
+		rc = kstrtouint(nkeystr, 0, &newkey);
+	if (rc < 0)
+		return rc;
+
+	if (i == OP_FREEZE) {
+		dev_dbg(dev, "freeze\n");
+		rc = nvdimm_security_freeze(nvdimm);
+	} else if (i == OP_DISABLE) {
+		dev_dbg(dev, "disable %u\n", key);
+		rc = security_disable(nvdimm, key);
+	} else if (i == OP_UPDATE || i == OP_MASTER_UPDATE) {
+		dev_dbg(dev, "%s %u %u\n", ops[i].name, key, newkey);
+		rc = security_update(nvdimm, key, newkey, i == OP_UPDATE
+				? NVDIMM_USER : NVDIMM_MASTER);
+	} else if (i == OP_ERASE || i == OP_MASTER_ERASE) {
+		dev_dbg(dev, "%s %u\n", ops[i].name, key);
+		if (atomic_read(&nvdimm->busy)) {
+			dev_dbg(dev, "Unable to secure erase while DIMM active.\n");
+			return -EBUSY;
+		}
+		rc = security_erase(nvdimm, key, i == OP_ERASE
+				? NVDIMM_USER : NVDIMM_MASTER);
+	} else if (i == OP_OVERWRITE) {
+		dev_dbg(dev, "overwrite %u\n", key);
+		if (atomic_read(&nvdimm->busy)) {
+			dev_dbg(dev, "Unable to overwrite while DIMM active.\n");
+			return -EBUSY;
+		}
+		rc = security_overwrite(nvdimm, key);
+	} else
+		return -EINVAL;
+
+	if (rc == 0)
+		rc = len;
+	return rc;
+}