hardware:gl-ar750s-ext:managing_firewall [ともやん・どっと・ねっと]

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====== ファイアウォール管理 ======

===== ホームネットワークトラフィック監視 =====

==== インストール ====
<WRAP prewrap 100%>
<code>
# opkg update && opkg install ulogd ulogd-mod-nfacct ulogd-mod-nfct ulogd-mod-nflog ulogd-mod-xml ulogd-mod-syslog ulogd-mod-extra syslog-ng
</code>
</WRAP>
<WRAP prewrap 100% #result>
<code>
Downloading https://fw.gl-inet.com/releases/kmod-3.2/ar71xx/nand/Packages.gz
Updated list of available packages in /var/opkg-lists/glinet_core
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/sync_kmod-3.2/Packages.gz
Updated list of available packages in /var/opkg-lists/glinet_sync
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/base/Packages.gz
Updated list of available packages in /var/opkg-lists/glinet_base
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/gli_pub/Packages.gz
Updated list of available packages in /var/opkg-lists/glinet_gli_pub
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/packages/Packages.gz
Updated list of available packages in /var/opkg-lists/glinet_packages
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/luci/Packages.gz
Updated list of available packages in /var/opkg-lists/glinet_luci
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/routing/Packages.gz
Updated list of available packages in /var/opkg-lists/glinet_routing
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/telephony/Packages.gz
Updated list of available packages in /var/opkg-lists/glinet_telephony
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/glinet/Packages.gz
Updated list of available packages in /var/opkg-lists/glinet_glinet
Installing ulogd (2.0.5-2) to root...
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/packages/ulogd_2.0.5-2_mips_24kc.ipk
Installing ulogd-mod-nfacct (2.0.5-2) to root...
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/packages/ulogd-mod-nfacct_2.0.5-2_mips_24kc.ipk
Installing ulogd-mod-nfct (2.0.5-2) to root...
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/packages/ulogd-mod-nfct_2.0.5-2_mips_24kc.ipk
Installing ulogd-mod-nflog (2.0.5-2) to root...
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/packages/ulogd-mod-nflog_2.0.5-2_mips_24kc.ipk
Installing ulogd-mod-xml (2.0.5-2) to root...
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/packages/ulogd-mod-xml_2.0.5-2_mips_24kc.ipk
Installing ulogd-mod-syslog (2.0.5-2) to root...
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/packages/ulogd-mod-syslog_2.0.5-2_mips_24kc.ipk
Installing ulogd-mod-extra (2.0.5-2) to root...
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/packages/ulogd-mod-extra_2.0.5-2_mips_24kc.ipk
Installing syslog-ng (3.9.1-3) to root...
Downloading https://fw.gl-inet.com/releases/packages-3.x/ar71xx/packages/syslog-ng_3.9.1-3_mips_24kc.ipk
Configuring syslog-ng.
Configuring ulogd.
Configuring ulogd-mod-extra.
Configuring ulogd-mod-nfct.
Configuring ulogd-mod-syslog.
Configuring ulogd-mod-xml.
Configuring ulogd-mod-nfacct.
Configuring ulogd-mod-nflog.
</code>
</WRAP>

==== syslog-ng の動作確認 ====
<code>
# cat /var/log/messages
Feb 26 05:48:04 TomoyanWRT-GL syslog-ng[7403]: syslog-ng starting up; version='3.9.1'
</code>

==== ulog の設定 ====
<code>
# vi /etc/ulog.conf
</code>
<WRAP prewrap 100%>
<code autoconf /etc/ulog.conf>
# this is a stack for flow-based logging via LOGEMU
#stack=ct1:NFCT,ip2str1:IP2STR,print1:PRINTFLOW,emu1:LOGEMU
stack=ct1:NFCT,ip2str1:IP2STR,print1:PRINTFLOW,sys1:SYSLOG

[ct1]
hash_enable=0
#netlink_socket_buffer_size=217088
#netlink_socket_buffer_maxsize=1085440
#netlink_resync_timeout=60 # seconds to wait to perform resynchronization
#pollinterval=10 # use poll-based logging instead of event-driven
# If pollinterval is not set, NFCT plugin will work in event mode
# In this case, you can use the following filters on events:
#accept_src_filter=192.168.1.0/24,1:2::/64 # source ip of connection must belong to these networks
#accept_dst_filter=192.168.1.0/24 # destination ip of connection must belong to these networks
#accept_proto_filter=tcp,sctp # layer 4 proto of connections
</code>
</WRAP>

ulogd を手動で実行して動作確認を行う。\\
<code>
# ulogd -v
Wed Feb 26 05:21:35 2020 <7> ulogd.c:622 load_plugin: '/usr/lib/ulogd/ulogd_filter_IP2BIN.so': Error relocating /usr/lib/ulogd/ulogd_filter_IP2BIN.so: uint32_to_ipv6: symbol not found
Wed Feb 26 05:21:35 2020 <5> ulogd.c:843 building new pluginstance stack: 'ct1:NFCT,ip2str1:IP2STR,print1:PRINTFLOW,sys1:SYSLOG'
Wed Feb 26 05:21:35 2020 <5> ulogd_inpflow_NFCT.c:1399 NFCT plugin working in event mode
</code>
**uint32_to_ipv6: symbol not found** はバグ？\\

==== ulogd の有効化と起動 ====
<code>
# service ulogd enable
# service ulogd start
</code>

==== 接続追跡フローアカウンティングを有効に設定 ====
<code>
# echo '1' > /proc/sys/net/netfilter/nf_conntrack_acct
# echo 'net.netfilter.nf_conntrack_acct=1' > /etc/sysctl.d/100-custom.conf
</code>

===== 参考文献 =====
[[https://openwrt.org/docs/guide-user/firewall/netfilter_iptables/iptables_log_targets|OpenWrt Project: Logging Forwarded Packets in OpenWrt]]\\
[[https://balagetech.com/monitor-network-traffic-openwrt-syslog-ng/|Monitor home network traffic with OpenWRT and Syslog-ng]]\\