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fw-addr-lists: add support for IPv6

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This commit is contained in:
Christian Hesse 2024-02-23 11:19:56 +01:00
parent 0125f102b4
commit 62790ae091
4 changed files with 68 additions and 4 deletions
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35
doc/fw-addr-lists.md
View file

@ -56,8 +56,12 @@ available in my repository and downloaded automatically. Import it manually
(menu `/certificate/`) if missing.
Create firewall rules to process the packets that are related to addresses
from address-lists. This rejects the packets from and to ip addresses listed
in address-list `block`.
from address-lists.
### IPv4 rules
This rejects the packets from and to IPv4 addresses listed in
address-list `block`.
/ip/firewall/filter/add chain=input src-address-list=block action=reject reject-with=icmp-admin-prohibited;
/ip/firewall/filter/add chain=forward src-address-list=block action=reject reject-with=icmp-admin-prohibited;
@ -85,6 +89,33 @@ Alternatively handle the packets in firewall's raw section if you prefer:
> ⚠️ **Warning**: Just again... The order of firewall rules is important. Make
> sure they actually take effect as expected!
### IPv6 rules
These are the same rules, but for IPv6.
Reject packets in address-list `block`:
/ipv6/firewall/filter/add chain=input src-address-list=block action=reject reject-with=icmp-admin-prohibited;
/ipv6/firewall/filter/add chain=forward src-address-list=block action=reject reject-with=icmp-admin-prohibited;
/ipv6/firewall/filter/add chain=forward dst-address-list=block action=reject reject-with=icmp-admin-prohibited;
/ipv6/firewall/filter/add chain=output dst-address-list=block action=reject reject-with=icmp-admin-prohibited;
Allow packets in address-list `allow`:
/ipv6/firewall/filter/add chain=input src-address-list=allow action=accept;
/ipv6/firewall/filter/add chain=forward src-address-list=allow action=accept;
/ipv6/firewall/filter/add chain=forward dst-address-list=allow action=accept;
/ipv6/firewall/filter/add chain=output dst-address-list=allow action=accept;
Drop packets in firewall's raw section:
/ipv6/firewall/raw/add chain=prerouting src-address-list=block action=drop;
/ipv6/firewall/raw/add chain=prerouting dst-address-list=block action=drop;
/ipv6/firewall/raw/add chain=output dst-address-list=block action=drop;
> ⚠️ **Warning**: Just again... The order of firewall rules is important. Make
> sure they actually take effect as expected!
---
[⬅️ Go back to main README](../README.md)
[⬆️ Go back to top](#top)

34
fw-addr-lists.rsc
View file

@ -24,7 +24,7 @@
:global WaitFullyConnected;
:local FindDelim do={
:local ValidChars "0123456789./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-";
:local ValidChars "0123456789.:/ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-";
:for I from=0 to=[ :len $1 ] do={
:if ([ :typeof [ :find $ValidChars [ :pick ($1 . " ") $I ] ] ] != "num") do={
:return $I;
@ -42,6 +42,7 @@ $WaitFullyConnected;
:local CntRenew 0;
:local CntRemove 0;
:local IPv4Addresses ({});
:local IPv6Addresses ({});
:local Failure false;
:foreach List in=$FwList do={
@ -87,6 +88,10 @@ $WaitFullyConnected;
$Address ~ "^[\\.a-zA-Z0-9-]+\\.[a-zA-Z]{2,}\$") do={
:set ($IPv4Addresses->$Address) $TimeOut;
}
:if ($Address ~ "^[0-9a-zA-Z]*:[0-9a-zA-Z:\\.]+(/[0-9]{1,3})?\$" || \
$Address ~ "^[\\.a-zA-Z0-9-]+\\.[a-zA-Z]{2,}\$") do={
:set ($IPv6Addresses->$Address) $TimeOut;
}
:set Data [ :pick $Data ([ :len $Line ] + 1) [ :len $Data ] ];
}
}
@ -107,6 +112,22 @@ $WaitFullyConnected;
}
}
:foreach Entry in=[ /ipv6/firewall/address-list/find where list=$FwListName comment=$ListComment ] do={
:local Address [ /ipv6/firewall/address-list/get $Entry address ];
:if ([ :typeof ($IPv6Addresses->$Address) ] = "time") do={
$LogPrintExit2 debug $0 ("Renewing IPv6 address for " . ($IPv6Addresses->$Address) . ": " . $Address) false;
/ipv6/firewall/address-list/set $Entry timeout=($IPv6Addresses->$Address);
:set ($IPv6Addresses->$Address);
:set CntRenew ($CntRenew + 1);
} else={
:if ($Failure = false) do={
$LogPrintExit2 debug $0 ("Removing: " . $Address) false;
/ipv6/firewall/address-list/remove $Entry;
:set CntRemove ($CntRemove + 1);
}
}
}
:foreach Address,Timeout in=$IPv4Addresses do={
$LogPrintExit2 debug $0 ("Adding IPv4 address for " . $Timeout . ": " . $Address) false;
:do {
@ -118,5 +139,16 @@ $WaitFullyConnected;
}
}
:foreach Address,Timeout in=$IPv6Addresses do={
$LogPrintExit2 debug $0 ("Adding IPv6 address for " . $Timeout . ": " . $Address) false;
:do {
/ipv6/firewall/address-list/add list=$FwListName comment=$ListComment address=$Address timeout=$Timeout;
:set ($IPv6Addresses->$Address);
:set CntAdd ($CntAdd + 1);
} on-error={
$LogPrintExit2 warning $0 ("Failed to add IPv6 address " . $Address . " to list '" . $FwListName . "'.") false;
}
}
$LogPrintExit2 info $0 ("list: " . $FwListName . " -- added: " . $CntAdd . " - renewed: " . $CntRenew . " - removed: " . $CntRemove) false;
}

2
global-functions.rsc
View file

@ -12,7 +12,7 @@
:local 0 [ :jobname ];
# expected configuration version
:global ExpectedConfigVersion 118;
:global ExpectedConfigVersion 119;
# global variables not to be changed by user
:global GlobalFunctionsReady false;

1
news-and-changes.rsc
View file

@ -43,6 +43,7 @@
[ $IfThenElse ($Resource->"total-hdd-space" < 16000000) ("Your " . $Resource->"board-name" . " is specifically affected! ") \
[ $IfThenElse ($Resource->"free-hdd-space" > 4000000) ("(Your " . $Resource->"board-name" . " does not suffer this issue.) ") ] ] . \
"Huge configuration and lots of scripts give an extra risk. Take care!");
119="Added support for IPv6 to script 'fw-addr-lists'.";
};
# Migration steps to be applied on script updates