Allow IPv6 extend cells
As part of #33817 (moved), we want to allow IPv6 extend cells.
We want clients and relays to send:
- dual-stack EXTEND2 cells
- IPv6-only EXTEND2 cells
We want relays to parse:
- dual-stack EXTEND2 cells
- IPv6-only EXTEND2 cells
As part of #33817 (moved), we want to allow IPv6 extend cells.
We want clients and relays to send:
We want relays to parse: