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First pass at 7, 14, and 30-bit varint packet numbers #1334

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May 8, 2018
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First pass at 7, 14, and 30-bit varint packet numbers #1334

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b3bb463
First pass at varint packet numbers
britram May 3, 2018
fae6da8
tweaks, thanks Martin and Ian
britram May 4, 2018
50f0501
long headers too
britram May 5, 2018
4f8bb35
Both long and short have varint PN
martinthomson May 7, 2018
8d49212
Merge pull request #1 from quicwg/long-and-short-varint-pn
britram May 7, 2018
3335dd5
Update examples for shorter encodings
martinthomson May 7, 2018
60811b2
Merge pull request #2 from quicwg/fix-pn-example
britram May 7, 2018
7b22bf0
Update table caption
martinthomson May 8, 2018
7fcd5a7
indent
janaiyengar May 8, 2018
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29 changes: 11 additions & 18 deletions draft-ietf-quic-transport.md
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Original file line number Diff line number Diff line change
Expand Up @@ -282,7 +282,7 @@ keys are established.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Payload Length (i) ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Packet Number (32) |
| Packet Number (8/16/32) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Payload (*) ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Expand Down Expand Up @@ -344,11 +344,10 @@ Payload Length:

Packet Number:

: The Packet Number is a 32-bit field that follows the two connection IDs.
Packet numbers are not encrypted as part of packet protection, but instead
have additional confidentiality protection. {{packet-numbers}} describes the
use of packet numbers.

: The packet number field is 1, 2, or 4 octets long. The packet number has
confidentiality protection separate from packet protection, as described in
Section 5.6 of {{QUIC-TLS}}. The length of the packet number field is encoded
in the plaintext packet number. See {{packet-numbers}} for details.

Payload:

Expand Down Expand Up @@ -449,8 +448,8 @@ Destination Connection ID:

Packet Number:

: The packet number field is either 1, 2, or 4 bytes long. The packet number
has confidentiality protection separate from packet protection, as described in
: The packet number field is 1, 2, or 4 octets long. The packet number has
confidentiality protection separate from packet protection, as described in
Section 5.6 of {{QUIC-TLS}}. The length of the packet number field is encoded
in the plaintext packet number. See {{packet-numbers}} for details.

Expand Down Expand Up @@ -776,15 +775,10 @@ CONNECTION_CLOSE frame or any further packets; a server MAY send a Stateless
Reset ({{stateless-reset}}) in response to further packets that it receives.

In the QUIC long and short packet headers, the number of bits required to
represent the packet number are reduced by including only the least
significant bits of the packet number.

In the long packet header, the least significant 32 bits of the packet number
are encoded into the Packet Number field.

In the short packet header, a variable number of significant bits are encoded.
One or two of the most significant bits of the first octet determine how many
bits of the packet number are provided, as shown in {{pn-encodings}}.
represent the packet number are reduced by including only a variable number of
the least significant bits of the packet number. One or two of the most
significant bits of the first octet determine how many bits of the packet
number are provided, as shown in {{pn-encodings}}.

| First octet pattern | Encoded Length | Bits Present |
|:--------------------|:---------------|:-------------|
Expand All @@ -793,7 +787,6 @@ bits of the packet number are provided, as shown in {{pn-encodings}}.
| 0b11xxxxxx | 4 | 30 |
{: #pn-encodings title="Short Header Packet Number Encodings"}
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"Packet Number Encoding for Packet Headers" perhaps


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{: #pn-encodings title="Short Header Packet Number Encodings"}


Note that these encodings are similar to those in {{integer-encoding}}, but
use different values.

Expand Down