Documentation/networking/ila.rst

1 .. SPDX-License-Identifier: GPL-2.0
4 Identifier Locator Addressing (ILA)
11 Identifier-locator addressing (ILA) is a technique used with IPv6 that
14 indicates the location of the node which can be dynamic. Identifier-locator
33   - Identifier
44 		A mapping of an ILA identifier to a locator (or to a
50 		four bits) and an identifier (lower sixty-four bits).
57 		bits) and an identifier (low order sixty-four bits). ILA
134 		the checksum. The low order sixteen bits of the identifier
140 bits of the identifier. When ILA to SIR address translation is done on
142 restores the identifier as it was originally sent.
145 Identifier types
152       0: interface identifier
154       1: locally unique identifier
156       2: virtual networking identifier for IPv4 address
158       3: virtual networking identifier for IPv6 unicast address
160       4: virtual networking identifier for IPv6 multicast address
162       5: non-local address identifier
166 identifier.
169 Identifier formats
172 Kernel ILA supports two optional fields in an identifier for formatting:
173 "C-bit" and "identifier type". The presence of these fields is determined
176 If the identifier type is present it occupies the three highest order
177 bits of an identifier. The possible values are given in the above list.
183 In the simplest format the identifier types, C-bit, and checksum
184 adjustment value are not present so an identifier is considered an
188      |                            Identifier                         |
195 checksum adjustment is in the low order 16 bits. The identifier is
199      |                            Identifier                         |
208      |     |C|                    Identifier                         |
213 The identifier type field may be present to indicate the identifier
216 used with the identifier type as illustrated below::
219      | Type|                      Identifier                         |
224 If the identifier type and the C-bit can be present simultaneously so
225 the identifier format would be::
228      | Type|C|                    Identifier                         |
253 set then the C-bit will be present. Identifier TYPE one of "luid" or
254 "use-format." In the case of use-format, the identifier type field is
279      # (no C-bit) and configure identifier type to be LUID so that the
280      # identifier type field will not be present.
288      # identifier field are used.
293      # set without the C-bit and the identifier type is configured to be LUID
294      # so that the identifier type field is not present.