Create openwrt/Readme.md

Pull request #61.

Author: alex-eri

openwrt/Readme.md

@@ -0,0 +1,69 @@
+Cross-compiling and packages for openwrt
+===
+
+Place Makefile in `packages/network/ipt-netflow` directory in OpenWRT bouldroot.
+Run `make menuconfig` and select package in Network/Netflow menu. Configure args partially supported.
+
+Run `make` to build full firmware or `make package/network/ipt-netflow/{clean,prepare,configure,compile,install}` to rebuild packages.
+
+To make git version uncomment two lines in Makefile.
+
+Tested to work on Chaos Calmer and Designated Driver with Atheros AR7xxx/AR9xxx target.
+
+For ipt-netflow 2.2 patches are needed, drop it for next version or git master to build.
+
+Making and installilng
+===
+
+```shell
+mkdir debian-toolchain
+sudo debootstrap jessie debian-toolchain
+sudo chroot debian-toolchain
+
+. /etc/profile
+apt update
+apt install git ssh-client build-essential mercurial subversion \
+   binutils flex bzip2 asciidoc ncurses-dev libssl-dev gawk zlib1g-dev fastjar
+
+adduser user
+su user
+. /etc/profile
+cd ~
+
+git clone https://github.com/openwrt/openwrt.git openwrt-trunk
+git clone https://github.com/aabc/ipt-netflow.git
+
+cd openwrt-trunk
+./scripts/feeds update -a
+ln -s ~/ipt-netflow/openwrt/ package/network/ipt-netflow
+
+
+make menuconfig
+  #select target and device
+  #go to network/netflow and check both
+
+make
+  #and go for dinner or a walk ;)
+  #after five hours
+
+scp bin/ar71xx/packages/kernel/kmod-ipt-netflow_4.4.14+2.2-2_ar71xx.ipk  \
+   root@192.168.236.79:/tmp/
+scp bin/ar71xx/packages/base/iptables-mod-netflow_2.2-2_ar71xx.ipk \
+   root@192.168.236.79:/tmp/
+scp bin/ar71xx/packages/base/kernel_4.4.14-1-abf9cc6feb410252d667326556dae184_ar71xx.ipk   \
+   root@192.168.236.79:/tmp/
+
+   #goto router
+ssh root@192.168.236.79
+
+opkg install /tmp/*.ipk
+
+insmod /lib/modules/4.4.14/ipt_NETFLOW.ko
+sysctl -w net.netflow.protocol=5
+sysctl -w net.netflow.destination=192.168.236.34:2055
+
+iptables -I FORWARD -j NETFLOW
+iptables -I INPUT -j NETFLOW
+iptables -I OUTPUT -j NETFLOW
+
+```