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ef597b026b
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>
207 lines
4.5 KiB
Plaintext
207 lines
4.5 KiB
Plaintext
config defaults
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option syn_flood 1
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option input REJECT
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option output ACCEPT
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option forward REJECT
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# Uncomment this line to disable ipv6 rules
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# option disable_ipv6 1
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config zone
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option name lan
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list network 'lan'
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option input ACCEPT
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option output ACCEPT
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option forward ACCEPT
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config zone
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option name wan
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list network 'wan'
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list network 'wan6'
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option input REJECT
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option output ACCEPT
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option forward REJECT
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option masq 1
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option mtu_fix 1
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config forwarding
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option src lan
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option dest wan
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# We need to accept udp packets on port 68,
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# see https://dev.openwrt.org/ticket/4108
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config rule
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option name Allow-DHCP-Renew
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option src wan
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option proto udp
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option dest_port 68
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option target ACCEPT
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option family ipv4
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# Allow IPv4 ping
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config rule
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option name Allow-Ping
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option src wan
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option proto icmp
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option icmp_type echo-request
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option family ipv4
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option target ACCEPT
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config rule
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option name Allow-IGMP
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option src wan
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option proto igmp
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option family ipv4
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option target ACCEPT
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# Allow DHCPv6 replies
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# see https://github.com/openwrt/openwrt/issues/5066
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config rule
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option name Allow-DHCPv6
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option src wan
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option proto udp
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option dest_port 546
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option family ipv6
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option target ACCEPT
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config rule
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option name Allow-MLD
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option src wan
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option proto icmp
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option src_ip fe80::/10
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list icmp_type '130/0'
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list icmp_type '131/0'
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list icmp_type '132/0'
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list icmp_type '143/0'
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option family ipv6
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option target ACCEPT
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# Allow essential incoming IPv6 ICMP traffic
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config rule
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option name Allow-ICMPv6-Input
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option src wan
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option proto icmp
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list icmp_type echo-request
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list icmp_type echo-reply
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list icmp_type destination-unreachable
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list icmp_type packet-too-big
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list icmp_type time-exceeded
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list icmp_type bad-header
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list icmp_type unknown-header-type
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list icmp_type router-solicitation
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list icmp_type neighbour-solicitation
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list icmp_type router-advertisement
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list icmp_type neighbour-advertisement
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option limit 1000/sec
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option family ipv6
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option target ACCEPT
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# Allow essential forwarded IPv6 ICMP traffic
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config rule
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option name Allow-ICMPv6-Forward
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option src wan
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option dest *
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option proto icmp
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list icmp_type echo-request
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list icmp_type echo-reply
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list icmp_type destination-unreachable
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list icmp_type packet-too-big
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list icmp_type time-exceeded
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list icmp_type bad-header
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list icmp_type unknown-header-type
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option limit 1000/sec
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option family ipv6
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option target ACCEPT
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config rule
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option name Allow-IPSec-ESP
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option src wan
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option dest lan
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option proto esp
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option target ACCEPT
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config rule
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option name Allow-ISAKMP
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option src wan
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option dest lan
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option dest_port 500
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option proto udp
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option target ACCEPT
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# allow interoperability with traceroute classic
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# note that traceroute uses a fixed port range, and depends on getting
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# back ICMP Unreachables. if we're operating in DROP mode, it won't
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# work so we explicitly REJECT packets on these ports.
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config rule
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option name Support-UDP-Traceroute
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option src wan
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option dest_port 33434:33689
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option proto udp
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option family ipv4
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option target REJECT
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option enabled false
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# include a file with users custom iptables rules
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config include
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option path /etc/firewall.user
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### EXAMPLE CONFIG SECTIONS
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# do not allow a specific ip to access wan
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#config rule
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# option src lan
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# option src_ip 192.168.45.2
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# option dest wan
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# option proto tcp
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# option target REJECT
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# block a specific mac on wan
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#config rule
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# option dest wan
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# option src_mac 00:11:22:33:44:66
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# option target REJECT
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# block incoming ICMP traffic on a zone
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#config rule
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# option src lan
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# option proto ICMP
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# option target DROP
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# port redirect port coming in on wan to lan
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#config redirect
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# option src wan
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# option src_dport 80
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# option dest lan
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# option dest_ip 192.168.16.235
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# option dest_port 80
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# option proto tcp
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# port redirect of remapped ssh port (22001) on wan
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#config redirect
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# option src wan
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# option src_dport 22001
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# option dest lan
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# option dest_port 22
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# option proto tcp
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### FULL CONFIG SECTIONS
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#config rule
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# option src lan
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# option src_ip 192.168.45.2
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# option src_mac 00:11:22:33:44:55
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# option src_port 80
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# option dest wan
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# option dest_ip 194.25.2.129
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# option dest_port 120
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# option proto tcp
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# option target REJECT
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#config redirect
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# option src lan
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# option src_ip 192.168.45.2
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# option src_mac 00:11:22:33:44:55
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# option src_port 1024
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# option src_dport 80
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# option dest_ip 194.25.2.129
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# option dest_port 120
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# option proto tcp
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