loopback naa wwn check

[Lukas Herbolt]

Hey all,
I was playing with loopback target and I reached situation where I
cannot create any other
target apart of those starting with 1,2,5. Reading the code it seems
to be b/c of following [1].

Second issue I have found is in the generate_wwn function [2]. When
creating the NAA or EUI,
You are actually stick to the one OUI (Organizationally Unique
Identifier) 001405 which belongs
to OpenIB (Qlogic corporation). I think it would be better to use
private OUIs listed at [3].

Attaching code which generates and check's OUIs.

[1]
---
def normalize_wwn(wwn_types, wwn):
    '''
    Take a WWN as given by the user and convert it to a standard text
    representation.

Returns (normalized_wwn, wwn_type), or exception if invalid wwn.
    '''
    wwn_test = {
    'free': lambda wwn: True,
    'iqn': lambda wwn: \
        re.match("iqn.[0-9]{4}-[0-1][0-9]..*..*", wwn) \
        and not re.search(' ', wwn) \
        and not re.search('_', wwn),
    'naa': lambda wwn: re.match("naa.[125][0-9a-fA-F]{15}$", wwn),
    'eui': lambda wwn: re.match("eui.[0-9a-f]{16}$", wwn),
    'ib': lambda wwn: re.match("ib.[0-9a-f]{32}$", wwn),
    'unit_serial': lambda wwn: \
        re.match("[0-9A-Fa-f]{8}(-[0-9A-Fa-f]{4}){3}-[0-9A-Fa-f]{12}$", wwn),
    }
---

[2]
---
def generate_wwn(wwn_type):
    '''
    Generates a random WWN of the specified type:
        - unit_serial: T10 WWN Unit Serial.
        - iqn: iSCSI IQN
        - naa: SAS NAA address
    @param wwn_type: The WWN address type.
    @type wwn_type: str
    @returns: A string containing the WWN.
    '''
    wwn_type = wwn_type.lower()
    if wwn_type == 'free':
        return str(uuid.uuid4())
    if wwn_type == 'unit_serial':
        return str(uuid.uuid4())
    elif wwn_type == 'iqn':
        localname = socket.gethostname().split(".")[0]
        localarch = os.uname()[4].replace("_", "")
        prefix = "iqn.2003-01.org.linux-iscsi.%s.%s" % (localname, localarch)
        prefix = prefix.strip().lower()
        serial = "sn.%s" % str(uuid.uuid4())[24:]
        return "%s:%s" % (prefix, serial)
    elif wwn_type == 'naa':
        # see http://standards.ieee.org/develop/regauth/tut/fibre.pdf
        # 5 = IEEE registered
        # 001405 = OpenIB OUI (they let us use it I guess?)
        # rest = random
        return "naa.5001405" + uuid.uuid4().hex[-9:]
    elif wwn_type == 'eui':
        return "eui.001405" + uuid.uuid4().hex[-10:]
    else:
        raise ValueError("Unknown WWN type: %s" % wwn_type)

---

[3]

http://standards-oui.ieee.org/oui/oui.txt