<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 29 Mar 2016, at 23:49, Tom Ritter <<a href="mailto:tom@ritter.vg" class="">tom@ritter.vg</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On 29 March 2016 at 02:29, Sebastian Hahn <<a href="mailto:hahn.seb@web.de" class="">hahn.seb@web.de</a>> wrote:<br class=""><blockquote type="cite" class="">I've been wondering about the private_nets const in src/or/policies. It<br class="">was added in a96c0affcb4cda1a2e0d83d123993d10efc6e396 but Nick doesn't<br class="">remember why, and I'm hoping someone has an idea (maybe teor, who I've<br class="">CCed here, who documented this in a later commit?). If nobody knows why<br class="">we do this I think we should remove it as likely incorrect.<br class=""></blockquote><br class="">0000::/8 is Reserved by the IETF, it is (a superset of) the deprecated<br class="">space for "IPv4 Compatible IPv6 Addresses". The addresses are not to<br class="">be reassigned for any other purposes.<br class=""><br class="">Authoritative source:<br class=""><a href="http://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml" class="">http://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml</a><br class=""><br class="">I'm not necessarily sure what private networks are all used for in<br class="">Tor, but maybe this explains it and makes sense?<br class=""></div></div></blockquote><br class=""></div><div>/** Private networks. This list is used in two places, once to expand the<br class=""> * "private" keyword when parsing our own exit policy, secondly to ignore<br class=""> * just such networks when building exit policy summaries. It is important<br class=""> * that all authorities agree on that list when creating summaries, so don't<br class=""> * just change this without a proper migration plan and a proposal and stuff.<br class=""> */</div><div><br class=""></div><div>So I think we should keep [::]/8 in the list of private addresses.</div><div><br class=""></div><div>That said, the list of IPv4 and IPv6 private addresses in tor is incomplete, and could be updated based on [0] [1] for IPv6, and [2] for IPv4 ([3] seems to have too much information to be useful).</div><div><br class=""></div><div>If we want to update it, we should consider:</div><div>private_nets</div><div>tor_addr_is_internal</div><div>(any other checks?)</div><div><br class=""></div><div>We would need to write a proposal - at the very least, it would need a new consensus method, and some discussion of what happens when clients and exits disagree on the definition of what's private and what's not.</div><div><br class=""></div><div>I don't think it's something I'll have time for, but if anyone else wants to guide us through the process, I'd be happy to support it and review code.</div><div><br class=""></div><div>Tim</div><div><br class=""></div><div>[0]: <a href="https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml" class="">https://www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml</a></div><div>[1]: <a href="https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml" class="">https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml</a></div><div>[2]: <a href="https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml" class="">https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml</a></div><div>[3]: <a href="https://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml" class="">https://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml</a></div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; 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white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Tim Wilson-Brown (teor)</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""></div><div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">teor2345 at gmail dot com<br class="">PGP 968F094B<br class=""><br class="">teor at blah dot im<br class="">OTR CAD08081 9755866D 89E2A06F E3558B7F B5A9D14F</div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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