| Internet-Draft | VRP Notation | October 2024 |
| Bruijnzeels, et al. | Expires 24 April 2025 | [Page] |
This document defines a human readable notation for Validated ROA Payloads (VRP, RFC 6811) based on ABNF (RFC 5234) for use with RPKI tooling and documentation.¶
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.¶
This informational document defines a human readable notation for Validated ROA Payloads (VRPs) [RFC6811].¶
We provide this notation because it can help to create consistency between RPKI Relying Party software output, making it easier for operators to compare results. It can also be used by RPKI Certificate Authorities (CA) command line interfaces and/or configuration. E.g. allowing a CA to provide a listing of intended VRPs which can be easily compared to RP output. Our final goal is that this will be helpful for documentation.¶
That said, this document is informational. Implementations can choose to use their own notation styles instead of, or in addition to this.¶
This specification uses ABNF syntax specified in [RFC5234].¶
notation = vrp-prefix separator origin-asn
vrp-prefix = v4-vrp-prefix / v6-vrp-prefix
v4-vrp-prefix = v4-cidr ["-" v4-max-length]
v4-cidr = v4-address "/" v4-pfx-length
v4-address = v4-byte "." v4-byte "." v4-byte "." v4-byte
v4-byte = %d0-255
v4-pfx-length = %d0-32
v4-max-length = %d0-32
v6-vrp-prefix = v6-cidr ["-" v6-max-length]
v6-cidr = v6-address "/" v6-pfx-length
v6-address = (v6-un / v6-no-0 / v6-l-0 / v6-m-0 / v6-t-0)
v6-un = "::"
v6-no-0 = v6-bytes 7*7(":" v6-bytes)
v6-l-0 = ":" 1*7(":" v6-bytes)
v6-m-0 = 1*6(v6-bytes ":") ":" 1*6(":" v6-bytes)
v6-t-0 = 1*7(v6-bytes ":") ":"
v6-bytes = %x0-FFFF
v6-pfx-length = %d0-128
v6-max-length = %d0-128
separator = " => "
origin-asn = "AS" uint32
uint32 = %d0-4294967295
¶
This field denotes a single Validated ROA Prefix (VRP) as defined in section 2 of [RFC6811]. VRPs consist of either an IPv4 or an IPv6 prefix using CIDR prefix notation, optionally followed by a max-length value.¶
Unfortunately we could not find pre-existing formal ABNF syntax specifications for IPv4 and IPv6 CIDR prefix notation. The fairly basic specifications defined above cover the notation of valid CIDR prefixes, but it should be noted that they also allow for the notation of invalid IPv6 addresses, and allow for prefix length values that are not applicable to the base IP address. Rather than trying to define these rules in detail here we refer to section 3.1 of [RFC4632] for guidelines on IPv4 CIDR notation and section 2.3 of [RFC4291] for IPv6.¶
If the max-length is specified then its value needs to be the same as or longer than the length of the prefix within the bounds applicable to the address family of the prefix. If it is omitted then the effective max-length for the VRP will be the same as the VPR prefix length.¶
This field consists of the string "AS" followed by a decimal value of a 32-bit Autonomous System Number using the asplain presentation as specified in [RFC5396]. Decimal values MUST represent a 32 bit value, and therefore MUST be part of the range 0-4294967295.¶
192.0.2.0/24 => AS65000 192.0.2.0/24-24 => AS65000 192.0.2.0/24-32 => AS65000 192.0.2.0/32 => AS65000 2001:db8::/32 => AS65000 2001:db8::/32-32 => AS65000 2001:db8::/32-128 => AS65000 2001:db8::/128 => AS65000¶
This document has no IANA actions.¶
Thanks to Nan Geng for the editorial feedback. Thanks to Randy Bush for suggesting to allow only one possible notation for AS numbers.¶