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List: unbound-users
Subject: Re: Better ratelimiting? (again)
From: Luiz Fernando Softov via Unbound-users <unbound-users () nlnetlabs ! nl>
Date: 2018-12-15 8:55:40
Message-ID: CAKy26iOsa1=11Efj98y0R95zj4_EJmfQRoANyJdFpeVSDQBuYA () mail ! gmail ! com
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When I first read the code, I noticed that each IP has its own structure
(in a hashtable), with the qps.
The source is using a global to store and lookup the limit
(infra_ip_ratelimit).
In my case, ip-ratelimit need some filter by network prefix, like
access-control does.
access-control: 192.168.0.0/16 allow
access-control: 192.168.1.0/24 deny
access-control: 192.168.2.0/24 deny
Using the low prefix to match cases.
ip-ratelimit: [prefix] <max-limit>/<second>
ip-ratelimit: 192.168.0.0/16 5/1
ip-ratelimit: 192.168.1.0/24 10/1
ip-ratelimit: 192.168.2.0/24 20/1
This way, each /32 will have limits according with the match rule.
I know there are many source to be written, such as a rbtree_t to store
limits like acl_list does, configs, lookups, etc.
As well as the main need to define how the functionality will be and what
resources it will have.
I can write this code, but due to my projects, I will only have time after
February or March 2019.
Until then, if someone has not written the functionality, we can define
with the community and see if the unbound team approves the idea, since I
do not know the impact that changes like these can bring.
Em sex, 14 de dez de 2018 Ã s 13:20, Daisuke HIGASHI via Unbound-users <
unbound-users@nlnetlabs.nl> escreveu:
> Hi,
>
> > I personally like the per-subnet option the most, as it gives full
> control over ip-ratelimiting.
>
> I believe that when we need such complicated rate-limiting feature
> we should use other software component built for such purpose.
>
> dnsdist (https://dnsdist.org) can do per-subnet query rate-limiting
> like below.
>
> =====================
> -- dnsdist.conf
>
> -- queries forwarded to 8.8.8.8
>
> newServer({address="8.8.8.8"})
> addLocal("0.0.0.0:53")
> addLocal("[::]:53")
>
> -- ACL for dnsdist service
> addACL("10.0.0.0/8")
> addACL("192.168.0.0/16")
>
> -- Mobile users limit is 1 qps per one IP (/32)
> mobile = newNMG()
> mobile:addMask("10.0.0.0/24")
> mobile:addMask("10.0.1.0/24")
> mobile:addMask("10.0.2.0/24")
> addAction(AndRule({NetmaskGroupRule(mobile), MaxQPSIPRule(1, 32)}),
> DropAction())
>
> -- business users limit is 5 qps per 8 IP (/29)
> business = newNMG()
> business:addMask("192.168.0.0/24")
> addAction(AndRule({NetmaskGroupRule(business), MaxQPSIPRule(5, 29)}),
> DropAction())
> ==============
>
> Regards,
> --
> Daisuke HIGASHI
>
[Attachment #3 (text/html)]
<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div \
dir="ltr"><div dir="ltr"><div dir="ltr"><font face="monospace, monospace"><span \
class="gmail_default" style="font-family:monospace,monospace"></span>When I first \
read the code, I noticed that each IP has its own structure<span \
class="gmail_default" style="font-family:monospace,monospace"> (in a \
</span>hashtable</font><span class="gmail_default" \
style="font-family:monospace,monospace">), with the qps</span><span \
style="font-family:monospace,monospace">.</span></div><div dir="ltr"><font \
face="monospace, monospace">The source is using a global to store<span \
class="gmail_default" style="font-family:monospace,monospace"> and lookup</span> the \
limit (infra_ip_ratelimit)<span class="gmail_default" \
style="font-family:monospace,monospace"></span>.<br><br><span class="gmail_default" \
style="font-family:monospace,monospace"></span></font><span class="gmail_default" \
style="font-family:monospace,monospace"></span><span \
style="font-family:monospace,monospace">In my case, ip-ratelimit need some filter by \
network prefix, like access-control does.</span></div><br \
style="font-family:monospace,monospace"><span \
style="font-family:monospace,monospace">access-control: <a \
href="http://192.168.0.0/16">192.168.0.0/16</a> allow</span><br \
style="font-family:monospace,monospace"><span \
style="font-family:monospace,monospace">access-control: <a \
href="http://192.168.1.0/24">192.168.1.0/24</a> deny</span><br \
style="font-family:monospace,monospace"><span \
style="font-family:monospace,monospace">access-control: <a \
href="http://192.168.2.0/24">192.168.2.0/24</a> deny</span><br \
style="font-family:monospace,monospace"><br \
style="font-family:monospace,monospace"><span \
style="font-family:monospace,monospace">Using the low prefix to match \
cases.</span><br style="font-family:monospace,monospace"><br \
style="font-family:monospace,monospace"><span \
style="font-family:monospace,monospace">ip-ratelimit: [prefix] \
<max-limit>/<second></span><br \
style="font-family:monospace,monospace"><span \
style="font-family:monospace,monospace"> </span><br \
style="font-family:monospace,monospace"><span \
style="font-family:monospace,monospace">ip-ratelimit: <a \
href="http://192.168.0.0/16">192.168.0.0/16</a> <span class="gmail_default" \
style="font-family:monospace,monospace">5</span>/1</span><br \
style="font-family:monospace,monospace"><span \
style="font-family:monospace,monospace">ip-ratelimit: <a \
href="http://192.168.1.0/24">192.168.1.0/24</a> 10/1</span><br \
style="font-family:monospace,monospace"><span \
style="font-family:monospace,monospace">ip-ratelimit: <a \
href="http://192.168.2.0/24">192.168.2.0/24</a> <span class="gmail_default" \
style="font-family:monospace,monospace">20</span>/1</span><br \
style="font-family:monospace,monospace"><br \
style="font-family:monospace,monospace"><div dir="ltr"><span \
style="font-family:monospace,monospace">This way, each /32 will have limits according \
with the match rule.<br></span><font face="monospace, monospace"><span \
class="gmail_default" style="font-family:monospace,monospace"></span><span \
class="gmail_default" style="font-family:monospace,monospace"></span><span \
class="gmail_default" \
style="font-family:monospace,monospace"></span></font></div><div dir="ltr"><font \
face="monospace, monospace">I know there are many <span class="gmail_default" \
style="font-family:monospace,monospace">source </span>to be written, such as <span \
class="gmail_default" style="font-family:monospace,monospace">a</span><span \
class="gmail_default" style="font-family:monospace,monospace"> </span><span \
class="gmail_default" style="font-family:monospace,monospace"></span></font><span \
class="gmail_default"><font face="monospace, monospace">rbtree_t to store limits like \
acl_list does, configs, lookups, etc</font></span><span \
style="font-family:monospace,monospace">.<br></span><span \
style="font-family:monospace,monospace">As well as the main need to define how the \
functionality will be and what resources it will have.</span><span \
style="font-family:monospace,monospace"><br></span></div><div dir="ltr"><font \
face="monospace, monospace"><br></font></div><div dir="ltr"><font face="monospace, \
monospace">I can write this code, but due to my projects, I will only have time after \
February or March 2019.</font></div><div dir="ltr"><font face="monospace, \
monospace"><br></font></div><div dir="ltr"><font face="monospace, monospace">Until \
then, if someone has not written the functionality, we can define with the community \
and see if the unbound team approves the idea, since I do not know the impact that \
changes like these can bring.</font></div><div dir="ltr"><font face="monospace, \
monospace"><br></font></div><div dir="ltr"><font face="monospace, \
monospace"><br></font></div><div dir="ltr"><font face="monospace, \
monospace"><br></font></div></div></div></div></div></div></div></div><br><div \
class="gmail_quote"><div dir="ltr">Em sex, 14 de dez de 2018 Ã s 13:20, Daisuke \
HIGASHI via Unbound-users <<a \
href="mailto:unbound-users@nlnetlabs.nl">unbound-users@nlnetlabs.nl</a>> \
escreveu:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px \
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi,<br> <br>
> I personally like the per-subnet option the most, as it gives full control over \
ip-ratelimiting.<br> <br>
I believe that when we need such complicated rate-limiting feature<br>
we should use other software component built for such purpose.<br>
<br>
dnsdist (<a href="https://dnsdist.org" rel="noreferrer" \
target="_blank">https://dnsdist.org</a>) can do per-subnet query rate-limiting<br> \
like below.<br> <br>
=====================<br>
-- dnsdist.conf<br>
<br>
-- queries forwarded to 8.8.8.8<br>
<br>
newServer({address="8.8.8.8"})<br>
addLocal("<a href="http://0.0.0.0:53" rel="noreferrer" \
target="_blank">0.0.0.0:53</a>")<br> addLocal("[::]:53")<br>
<br>
-- ACL for dnsdist service<br>
addACL("<a href="http://10.0.0.0/8" rel="noreferrer" \
target="_blank">10.0.0.0/8</a>")<br> addACL("<a \
href="http://192.168.0.0/16" rel="noreferrer" \
target="_blank">192.168.0.0/16</a>")<br> <br>
-- Mobile users limit is 1 qps per one IP (/32)<br>
mobile = newNMG()<br>
mobile:addMask("<a href="http://10.0.0.0/24" rel="noreferrer" \
target="_blank">10.0.0.0/24</a>")<br> mobile:addMask("<a \
href="http://10.0.1.0/24" rel="noreferrer" target="_blank">10.0.1.0/24</a>")<br> \
mobile:addMask("<a href="http://10.0.2.0/24" rel="noreferrer" \
target="_blank">10.0.2.0/24</a>")<br> \
addAction(AndRule({NetmaskGroupRule(mobile), MaxQPSIPRule(1, 32)}),<br> \
DropAction())<br> <br>
-- business users limit is 5 qps per 8 IP (/29)<br>
business = newNMG()<br>
business:addMask("<a href="http://192.168.0.0/24" rel="noreferrer" \
target="_blank">192.168.0.0/24</a>")<br> \
addAction(AndRule({NetmaskGroupRule(business), MaxQPSIPRule(5, 29)}),<br> \
DropAction())<br> ==============<br>
<br>
Regards,<br>
-- <br>
Daisuke HIGASHI<br>
</blockquote></div>
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