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Re: [tor-bugs] #33618 [Core Tor/Tor]: Add IPv6 Support to is_local_addr()
#33618: Add IPv6 Support to is_local_addr()
------------------------------------------+--------------------------------
Reporter: kimimaro | Owner: (none)
Type: enhancement | Status: new
Priority: Medium | Milestone: Tor:
| 0.4.4.x-final
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: outreachy-ipv6 ipv6 prop312 | Actual Points:
Parent ID: | Points: 1
Reviewer: | Sponsor: Sponsor55-can
------------------------------------------+--------------------------------
Changes (by teor):
* keywords: outreachy-ipv6 ipv6 => outreachy-ipv6 ipv6 prop312
* milestone: => Tor: 0.4.4.x-final
* points: => 1
* sponsor: => Sponsor55-can
Old description:
> " We propose this optional change, to improve the accuracy of IPv6
> address
> detection from directory documents.
>
> Directory servers use is_local_addr() to detect if the requesting tor
> instance is on the same local network. If it is, the directory server
> does
> not include the X-Your-Address-Is HTTP header in directory documents.
>
> Currently, is_local_addr() checks for:
> * an internal IPv4 or IPv6 address, or
> * the same IPv4 /24 as the directory server.
>
> We propose also checking for:
> * the same IPv6 /48 as the directory server.
>
> We choose /48 because it is typically the smallest network in the
> global
> IPv6 routing tables, and it was previously the recommended per-
> customer
> network block. (See [RFC 6177: IPv6 End Site Address Assignment].)
>
> Tor currently uses:
> * IPv4 /8 and IPv6 /16 for port summaries,
> * IPv4 /16 and IPv6 /32 for path selection (avoiding relays in the
> same
> network block).
> See also the next section, which uses IPv6 /64 for sybils."
> Source: https://gitweb.torproject.org/torspec.git/tree/proposals/312
> -relay-auto-ipv6-addr.txt#n1099
New description:
We propose this optional change, to improve the accuracy of IPv6 address
detection from directory documents.
Directory servers use is_local_addr() to detect if the requesting tor
instance is on the same local network. If it is, the directory server does
not include the X-Your-Address-Is HTTP header in directory documents.
Currently, is_local_addr() checks for:
* an internal IPv4 or IPv6 address, or
* the same IPv4 /24 as the directory server.
We propose also checking for:
* the same IPv6 /48 as the directory server.
We choose /48 because it is typically the smallest network in the global
IPv6 routing tables, and it was previously the recommended per-customer
network block. (See [RFC 6177: IPv6 End Site Address Assignment].)
Tor currently uses:
* IPv4 /8 and IPv6 /16 for port summaries,
* IPv4 /16 and IPv6 /32 for path selection (avoiding relays in the same
network block).
Source: https://gitweb.torproject.org/torspec.git/tree/proposals/312
-relay-auto-ipv6-addr.txt#n1099
--
Comment:
I just fixed the ticket description formatting so it's more readable, and
added some standard ticket fields.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33618#comment:3>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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