Add ipv6 local network filters

[gwarser]

uBlockOrigin/uBlock-issues#1070

What is still missing in my list is ipv6 handling https://en.wikipedia.org/wiki/Private_network#Private_IPv6_addresses. No one will scan these addresses from a to z, but some software can still be listening on one.

Calculator https://www.vultr.com/resources/subnet-calculator-ipv6/

• fc00::/7 ranges from fc00:0000:0000:0000:0000:0000:0000:0000 to fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

  ||[fc*]^
||[fd*]^

• fd00::/8 should be included in above - fd00:0000:0000:0000:0000:0000:0000:0000 to fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

• legacy "site-local" fec0::/10 - fec0:0000:0000:0000:0000:0000:0000:0000 to feff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

  ||[fec*]^
||[fed*]^
||[fee*]^
||[fef*]^

I'm not sure my filters above are actually valid or if these addresses can be so easily matched by simple text comparison with wildcard. Is [ and ] invalid in normal domain name? Someone with better knowledge about ipv6 address formatting will need to say. It may be good based on this: https://en.wikipedia.org/wiki/IPv6_address#Representation

[gwarser]

Better calc http://www.gestioip.net/cgi-bin/subnet_calculator.cgi

[gwarser]

Hmmm, does it have the same issue as in #6 (comment) ?

[fc* can be [fc00:..., [fc0:..., [fc:....

[curiosityseeker]

I'm not an expert in these things at all. Just mentioning that the Behave add-on uses these rules. No idea if that's helpful for you ...

[gwarser]

Only this part is about ipv6 (^[fF][cCdD]) - this matches fc or fd and:

[fc* can be [fc00:..., [fc0:..., [fc:....

[gwarser]

/^https?://\[f(?:[cd][0-9a-f]{2}|e[c-f][0-9a-f]):[0-9a-f:]+\][:/]/$third-party,~websocket
/^wss?://\[f(?:[cd][0-9a-f]{2}|e[c-f][0-9a-f]):[0-9a-f:]+\][:/]/$third-party,websocket

https://regex101.com/r/O0tAKl/1

/^https?://\[f(?:[cd][0-9a-f]|e[c-f])[0-9a-f]:[0-9a-f:]+\][:/]/$third-party,~websocket
/^wss?://\[f(?:[cd][0-9a-f]|e[c-f])[0-9a-f]:[0-9a-f:]+\][:/]/$third-party,websocket

[gwarser]

For not tokenizable regexes it may be good idea to compile only one regular expression.

/^(?:http|ws)s?://\[f(?:[cd][0-9a-f]|e[c-f])[0-9a-f]:[0-9a-f:]+\][:/]/$third-party

https://regex101.com/r/O0tAKl/2