This is necessary with firewall4 to avoid a hard-to-diagnose race
condition during boot, causing DNAT rules not to be taken into account
correctly.
The root cause is that, during boot, the ruleset is mostly empty, and
interface-related rules (including DNAT rules) are added incrementally.
If a packet hits the input chain before the DNAT rules are setup, it can
create buggy conntrack entries that will persist indefinitely.
This new default should be safe because firewall4 explicitly accepts
authorized traffic and rejects the rest. Thus, in normal operations, the
default policy is not used.
Fixes: #10749
Ref: https://github.com/openwrt/openwrt/issues/10749
Signed-off-by: Baptiste Jonglez <git@bitsofnetworks.org>
Remove restrictions on source and destination addresses, which aren't
specified on RFC8415, and for some reason in openwrt are configured
to allow both link-local and ULA addresses.
As cleared out in issue #5066 there are some ISPs that use Gloabal
Unicast addresses, so fix this rule to allow them.
Fixes: #5066
Signed-off-by: Tiago Gaspar <tiagogaspar8@gmail.com>
[rebase onto firewall3, clarify subject, bump PKG_RELEASE]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Running your firewall's "wan" zone in REJECT zone (1) exposes the
presence of the router, (2) depending on the sophistication of
fingerprinting tools might identify the OS and release running on
the firewall which then identifies known vulnerabilities with it
and (3) perhaps most importantly of all, your firewall can be
used in a DDoS reflection attack with spoofed traffic generating
ICMP Unreachables or TCP RST's to overwhelm a victim or saturate
his link.
This rule, when enabled, allows traceroute to work even when the
default input policy of the firewall for the wan zone has been
set to DROP.
Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>
These are recommended practices by REC-22 and REC-24 of RFC6092:
"Recommended Simple Security Capabilities in Customer Premises Equipment
(CPE) for Providing Residential IPv6 Internet Service"
Fixes FS#640
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
There is no RFC requirement that DHCPv6 servers must reply with a link local
address and some ISP servers in the wild appear to using addresses in the ULA
range to send DHCPv6 offers.
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
SVN-Revision: 47048
Seems like my second try was again whitespace broken. Sorry for the noise.
Remove src_port from firewall.config to receive dhcpv6 replies. Fixes#20295.
Signed-off-by: Anselm Eberhardt <a.eberhardt@cygnusnetworks.de>
SVN-Revision: 46842
The WAN port should at least respond to IGMP and MLD queries as
otherwise a snooping bridge/switch might drop traffic.
RFC4890 recommends to leave IGMP and MLD unfiltered as they are always
link-scoped anyways.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
SVN-Revision: 45613
somebody started to set a function returncode in the validation
stuff and everybody copies it, e.g.
myfunction()
{
fire_command
return $?
}
a function automatically returns with the last returncode,
so we can safely remove the command 'return $?'. reference:
http://tldp.org/LDP/abs/html/exit-status.html
"The last command executed in the function or script determines the exit status."
Signed-off-by: Bastian Bittorf <bittorf@bluebottle.com>
SVN-Revision: 42278
* Use network.interface dump call instead of individual status calls
to reduce overall netifd lookups and invokes to 1 per fw3 process.
* Allow protocol handlers to assign a firewall zone for an interface
in the data section to allow for dynamic firewall zone assignment.
SVN-Revision: 38504
- reduce mssfix related log spam (#10681)
- separate src and dest terminal chains (#11453, #12945)
- disable per-zone custom chains by default, they're rarely used
Additionally introduce options "device", "subnet", "extra", "extra_src" and "extra_dest"
to allow defining zones not related to uci interfaces, e.g. to match "ppp+" or any tcp
traffic to and from a specific port.
SVN-Revision: 35484
- use comment match to keep track of per-network rules
- setup reflection for any interface which is part of a masqueraded zone, not just "wan"
- delete per-network reflection rules if network is brought down
SVN-Revision: 34472
