OpenMPTCProuter

https://github.com/ysurac/openmptcprouter
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OpenMPTCProuter is an open-source solution that aggregates and encrypts multiple internet...
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### System Preparation and Installation Commands

Source: https://github.com/ysurac/openmptcprouter/wiki/Install-or-update-the-VPS

Standard commands to update system packages and execute the OpenMPTCProuter installation script. The script requires root privileges and supports specific kernel versions.

```bash
apt-get update && apt-get upgrade
```

```bash
wget -O - https://www.openmptcprouter.com/server/debian-x86_64.sh | KERNEL="6.12" sh
```

```bash
wget https://www.openmptcprouter.com/server/debian-x86_64.sh
KERNEL="6.12" sh debian-x86_64.sh
```

--------------------------------

### Build OpenMPTCProuter for x86/x64 Targets

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Builds OpenMPTCProuter for x86 and x86_64 architectures, supporting both physical installations and virtual machines. It includes options for image formats, partitioning, and instructions for physical, VirtualBox, VMware, and Hyper-V installations.

```bash
# x86_64 build with VM image formats
OMR_TARGET="x86_64" OMR_KERNEL="6.12" OMR_IMG="yes" OMR_PARTSIZE="1024" ./build.sh

# Configuration generates multiple formats:
# - omr-x86-64-generic-ext4-combined.img (raw disk image)
# - omr-x86-64-generic-squashfs-combined.img.gz
# - omr-x86-64-generic.vdi (VirtualBox)
# - omr-x86-64-generic.vmdk (VMware)
# - omr-x86-64-generic.vhdx (Hyper-V)

# Physical installation
gunzip omr-x86-64-*.img.gz
dd bs=4M if=omr-x86-64-*.img of=/dev/sda conv=fsync

# VirtualBox installation
# 1. Create new VM (Linux 2.6/3.x/4.x/5.x 64-bit)
# 2. Use existing VDI file
# 3. Configure network: Adapter 1 (WAN1), Adapter 2 (WAN2), Adapter 3 (LAN)
# 4. Start VM

# VMware installation
# 1. Create new VM
# 2. Use existing VMDK file
# 3. Network adapters: WAN interfaces + LAN interface
# 4. Power on

# Hyper-V installation
New-VM -Name "OpenMPTCProuter" -MemoryStartupBytes 1GB -VHDPath "omr-x86-64-generic.vhdx"
Add-VMNetworkAdapter -VMName "OpenMPTCProuter" -SwitchName "WAN1"
Add-VMNetworkAdapter -VMName "OpenMPTCProuter" -SwitchName "WAN2"
Start-VM -Name "OpenMPTCProuter"
```

--------------------------------

### Enable Advanced Network Kernel Features

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Provides configuration for kernel modules supporting traffic control, VLANs, and bridging. Includes a practical example for setting up a VLAN interface.

```bash
CONFIG_PACKAGE_kmod-bridge=y
CONFIG_PACKAGE_kmod-8021q=y
CONFIG_PACKAGE_kmod-sched=y

ip link add link eth0 name eth0.100 type vlan id 100
ip addr add 192.168.100.1/24 dev eth0.100
ip link set eth0.100 up
```

--------------------------------

### Legacy Kernel Installation

Source: https://github.com/ysurac/openmptcprouter/wiki/Install-or-update-the-VPS

Installation command for legacy MPTCP support using kernel 5.4. Ensure the router side also utilizes kernel 5.4 for compatibility.

```bash
wget -O - https://www.openmptcprouter.com/server/debian-x86_64.sh | KERNEL="5.4" sh
```

--------------------------------

### Configure USB Network Adapter Modules

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Lists kernel module packages for enabling USB-based network interfaces and modems. Includes runtime diagnostic commands for hardware verification.

```bash
CONFIG_PACKAGE_kmod-usb-net-cdc-ether=y
CONFIG_PACKAGE_kmod-usb-net-qmi-wwan=y
CONFIG_PACKAGE_kmod-usb-serial-option=y

lsusb
dmesg | grep -i usb
ip link show
```

--------------------------------

### C LZMA Encoder Allocator Setup

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/lib/lzma/lzma.txt

Illustrates the setup of memory allocators for the LZMA encoder. It shows how to define custom allocation and deallocation functions, which can be optimized for specific memory management strategies.

```c
static void *SzAlloc(void *p, size_t size) { p = p; return MyAlloc(size); }
static void SzFree(void *p, void *address) {  p = p; MyFree(address); }
static ISzAlloc g_Alloc = { SzAlloc, SzFree };
```

--------------------------------

### Deploy MPTCP server on VPS

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Installs and configures the OpenMPTCProuter server component on a Debian VPS. This process involves executing an installation script, handling potential certificate issues, and retrieving configuration keys.

```bash
# Install with kernel 6.12 (recommended)
wget -O - https://www.openmptcprouter.com/server/debian-x86_64.sh | KERNEL="6.12" sh

# Alternative method
wget https://www.openmptcprouter.com/server/debian-x86_64.sh
KERNEL="6.12" sh debian-x86_64.sh

# Fix certificate errors if needed
apt-get install -y ca-certificates
sed -i '/^mozilla\/DST_Root_CA_X3/s/^/!/' /etc/ca-certificates.conf
update-ca-certificates -f

# Retrieve configuration keys post-reboot
cat /root/openmptcprouter_config.txt
```

--------------------------------

### Configure bootloader and partitions

Source: https://github.com/ysurac/openmptcprouter/wiki/Router-install

Update the primary boot partition and sync boot configuration binaries to the device flash to ensure the system boots correctly from the new installation.

```shell
echo 0 > /proc/boot_info/rootfs/primaryboot
cat /proc/boot_info/getbinary_bootconfig > /tmp/bootconfig.bin
cat /proc/boot_info/getbinary_bootconfig1 > /tmp/bootconfig1.bin
mtd write /tmp/bootconfig.bin /dev/mtd2
mtd write /tmp/bootconfig1.bin /dev/mtd3
```

--------------------------------

### Configure BusyBox Utilities for OpenMPTCProuter

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Customizes BusyBox utilities by enabling specific features and configurations within the build system. This allows for enhanced system administration capabilities like user management, network diagnostics, and process control. Example usage commands are provided after building.

```bash
# Enhanced BusyBox configuration (in config file)
CONFIG_BUSYBOX_CUSTOM=y
CONFIG_BUSYBOX_CONFIG_ADDUSER=y            # User management
CONFIG_BUSYBOX_CONFIG_DELUSER=y
CONFIG_BUSYBOX_CONFIG_CHPASSWD=y
CONFIG_BUSYBOX_CONFIG_ARP=y                # Network tools
CONFIG_BUSYBOX_CONFIG_ARPING=y
CONFIG_BUSYBOX_CONFIG_TELNET=y
CONFIG_BUSYBOX_CONFIG_NOHUP=y              # Process management
CONFIG_BUSYBOX_CONFIG_PKILL=y
CONFIG_BUSYBOX_CONFIG_TIMEOUT=y
CONFIG_BUSYBOX_CONFIG_WATCH=y
CONFIG_BUSYBOX_CONFIG_IOSTAT=y             # System monitoring
CONFIG_BUSYBOX_CONFIG_STAT=y
CONFIG_BUSYBOX_CONFIG_STTY=y               # Terminal control
CONFIG_BUSYBOX_CONFIG_DIFF=y               # File comparison
CONFIG_BUSYBOX_CONFIG_BASE64=y             # Encoding
CONFIG_BUSYBOX_CONFIG_BC=y                 # Calculator

# Feature flags
CONFIG_BUSYBOX_CONFIG_FEATURE_VI_UNDO=y
CONFIG_BUSYBOX_CONFIG_FEATURE_PS_LONG=y
CONFIG_BUSYBOX_CONFIG_FEATURE_STAT_FILESYSTEM=y
CONFIG_BUSYBOX_CONFIG_FEATURE_DATE_NANO=y

# Example usage after build
# User management
adduser newuser
echo "newuser:password" | chpasswd

# Network diagnostics
arping -c 4 192.168.1.1
watch -n 1 'ip -s link'

# System monitoring
iostat 1 5
stat /etc/config/network
```

--------------------------------

### Configure VPS Network Firewall Rules

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Defines the necessary firewall port requirements for services like SSH, Shadowsocks, and VPNs. Provides implementation examples for UFW, iptables, and cloud provider security groups.

```bash
ufw allow 65000:65535/tcp
ufw allow 65000:65535/udp
ufw allow 443/tcp
ufw enable

iptables -A INPUT -p tcp --dport 65000:65535 -j ACCEPT
iptables -A INPUT -p udp --dport 65000:65535 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p icmp -j ACCEPT
iptables-save > /etc/iptables/rules.v4
```

--------------------------------

### Configure build system environment variables

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Environment variables control the build process including image generation, kernel selection, and directory management. These variables allow for repeatable and customized build configurations.

```bash
export OMR_DIST="openmptcprouter"
export OMR_TARGET="x86_64"
export OMR_KERNEL="6.1"
export OMR_PACKAGES="full"
export OMR_ALL_PACKAGES="yes"
export OMR_IMG="yes"
export OMR_KEEPBIN="no"
export OMR_PARTSIZE="512"
export OMR_LIBC="musl"
export OMR_FEED_URL="https://github.com/ysurac/openmptcprouter-feeds"
export OMR_FEED_SRC="develop"

# Build with custom configuration
OMR_TARGET="r4s" OMR_KERNEL="6.6" OMR_PARTSIZE="1024" ./build.sh -j8
```

--------------------------------

### MPC7xxx System and Board Initialization (C)

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/board/evb64260/bootseq.txt

Initializes essential system components after basic hardware setup. This includes setting up the stack pointer, Global Offset Table (GOT), calling CPU-specific initialization, and performing board-level early setup routines.

```c
    setup stack pointer (r1)
    setup GOT
    call cpu_init_f
	debug leds
    board_init_f: (common/board.c)
	board_early_init_f:
	    remap gt regs?
	    map PCI mem/io
	    map device space
	    clear out interrupts
	init_timebase
	env_init
	serial_init
	console_init_f
	display_options
```

--------------------------------

### Enable MPTCP Kernel Options and Testing

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Covers kernel configuration flags for MPTCP, including congestion control and path management. Includes commands to verify MPTCP settings on a running system.

```bash
CONFIG_KERNEL_MPTCP=y
CONFIG_KERNEL_MPTCP_FULLMESH=y
CONFIG_KERNEL_TCP_CONG_BBR=y

ip mptcp endpoint show
ip mptcp limits show
sysctl -a | grep mptcp
```

--------------------------------

### Build OpenMPTCProuter for Raspberry Pi Targets

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Instructions for building OpenMPTCProuter specifically for Raspberry Pi models (2, 3, 4, 5). It specifies the target architecture and kernel version, then executes the build script. It also includes steps for flashing the resulting image to an SD card and post-installation access details.

```bash
# Raspberry Pi 4 configuration (config-rpi4)
# Architecture: aarch64_cortex-a72
OMR_TARGET="rpi4" OMR_KERNEL="6.6" ./build.sh

# Raspberry Pi 5 configuration (config-rpi5)
# Architecture: aarch64_cortex-a76
OMR_TARGET="rpi5" OMR_KERNEL="6.12" ./build.sh

# Raspberry Pi 3 configuration (config-rpi3)
# Architecture: aarch64_cortex-a53
OMR_TARGET="rpi3" OMR_KERNEL="6.1" ./build.sh

# Raspberry Pi 2 configuration (config-rpi2)
# Architecture: arm_cortex-a7_neon-vfpv4
OMR_TARGET="rpi2" OMR_KERNEL="5.4" ./build.sh

# Installation to SD card
gunzip omr-rpi4-*.img.gz
# On Linux
dd bs=4M if=omr-rpi4-*.img of=/dev/mmcblk0 conv=fsync status=progress
# On macOS
dd bs=4m if=omr-rpi4-*.img of=/dev/rdisk2 conv=sync
# On Windows (use Win32DiskImager or Rufus)

# Post-installation
# 1. Insert SD card into Raspberry Pi
# 2. Connect Ethernet cable
# 3. Power on
# 4. Access via http://192.168.100.1 or SSH to root@192.168.100.1
```

--------------------------------

### Certificate Error Resolution

Source: https://github.com/ysurac/openmptcprouter/wiki/Install-or-update-the-VPS

Command to fix potential SSL/TLS certificate errors by updating CA certificates and modifying the local trust store configuration.

```bash
apt-get install -y ca-certificates && sed -i '/^mozilla\/DST_Root_CA_X3/s/^/!/' /etc/ca-certificates.conf && update-ca-certificates -f
```

--------------------------------

### Build OpenMPTCProuter firmware images

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Utilizes the build.sh script to generate custom firmware images for specific hardware targets. Users can define the target platform, kernel version, and package sets via environment variables.

```bash
# Clone the repository
git clone https://github.com/Ysurac/openmptcprouter.git
cd openmptcprouter
git checkout master

# Build for x86_64 platform with kernel 6.1
OMR_TARGET="x86_64" OMR_FEED_SRC="master" OMR_KERNEL="6.1" ./build.sh

# Build for Raspberry Pi 4 with kernel 5.4
OMR_TARGET="rpi4" OMR_FEED_SRC="master" OMR_KERNEL="5.4" ./build.sh -j4

# Build with custom package set
OMR_TARGET="x86_64" OMR_KERNEL="6.6" OMR_PACKAGES="full" ./build.sh

# Build all packages (not just selected)
OMR_TARGET="x86_64" OMR_ALL_PACKAGES="yes" OMR_KERNEL="6.1" ./build.sh
```

--------------------------------

### Install OpenMPTCProuter Development Server via Shell

Source: https://github.com/ysurac/openmptcprouter/wiki/Snapshots

This command downloads and executes the OpenMPTCProuter server installation script for Debian/Ubuntu. It supports custom kernel versions via the KERNEL environment variable and allows disabling Fail2ban by setting the FAIL2BAN environment variable.

```shell
wget -O - https://www.openmptcprouter.com/server-test/debian-x86_64.sh | KERNEL="6.18" sh
```

```shell
FAIL2BAN="no" wget -O - https://www.openmptcprouter.com/server-test/debian-x86_64.sh | KERNEL="6.18" sh
```

--------------------------------

### MPC7xxx Post-Relocation Initialization (C)

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/board/evb64260/bootseq.txt

Performs final initialization steps after code relocation. This includes trap handling, flash memory setup, memory allocation initialization, and miscellaneous board-specific configurations.

```c

trap_init
	flash_init: (board/evb64260/flash.c)
	setup bd flash info
	cpu_init_r: (cpu/mpc7xxx/cpu_init.c)
	    nothing
	mem_malloc_init
	malloc_bin_reloc
	spi_init (r or f)??? (CONFIG_ENV_IS_IN_EEPROM)
	env_relocated
	misc_init_r(bd): (board/evb64260/evb64260.c)
	    mpsc_init2
```

--------------------------------

### Verify device partition set

Source: https://github.com/ysurac/openmptcprouter/wiki/Router-install

Check the current boot partition set before proceeding with firmware installation. If the primaryboot file reads 0, a Teltonika software update is required prior to the installation.

```shell
cat /proc/boot_info/rootfs/primaryboot
```

--------------------------------

### Build OpenMPTCProuter for Embedded Router Targets

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

Build firmware for various commercial embedded routers, including Linksys, Banana Pi, FriendlyElec, GL.iNet, Ubiquiti, and Teltonika. This snippet outlines the build command with specific target names and kernel versions, and mentions common installation methods like web interface or TFTP.

```bash
# Linksys WRT3200ACM/WRT32X (Marvell Armada 385)
# Architecture: arm_cortex-a9_vfpv3-d16
OMR_TARGET="wrt3200acm" OMR_KERNEL="6.1" ./build.sh
# Flash via web interface or TFTP recovery

# Banana Pi R2/R3/R4 (MediaTek)
OMR_TARGET="bpi-r3" OMR_KERNEL="6.6" ./build.sh
# Architecture: aarch64_cortex-a53

# FriendlyElec NanoPi R2S/R4S/R5S (Rockchip)
OMR_TARGET="r4s" OMR_KERNEL="6.6" ./build.sh
# Architecture: aarch64_generic

# GL.iNet routers
OMR_TARGET="gl-mt6000" OMR_KERNEL="6.6" ./build.sh
# Architecture: aarch64_cortex-a53

# Ubiquiti EdgeRouter X
OMR_TARGET="ubnt-erx" OMR_KERNEL="5.4" ./build.sh
# Architecture: mipsel_24kc

# Teltonika RUTX series (4G/5G industrial routers)
OMR_TARGET="rutx12" OMR_KERNEL="6.6" ./build.sh
# Architecture: arm_cortex-a7_neon-vfpv4

# Installation typically via:
# 1. Web interface (System > Backup/Flash Firmware)
# 2. TFTP recovery mode
# 3. Serial console and U-Boot
# Refer to device-specific documentation
```

--------------------------------

### Bridge Configuration using brctl

Source: https://context7.com/ysurac/openmptcprouter/llms.txt

This snippet demonstrates how to configure a network bridge named 'br0' using the 'brctl' command. It adds network interfaces 'eth0' and 'eth1' to the bridge and brings the bridge interface up. This is a fundamental step for network bridging.

```bash
brctl addbr br0
brctl addif br0 eth0
brctl addif br0 eth1
ip link set br0 up
```

--------------------------------

### MPC7xxx Assembly Boot Entry Points

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/board/evb64260/bootseq.txt

Defines the entry points for cold and warm boots in the MPC7xxx assembly code. The 'start' label branches to 'boot_cold' for a cold boot, while 'start_warm' branches to 'boot_warm' for a warm reboot.

```assembly
start:
    b boot_cold

start_warm:
    b boot_warm
```

--------------------------------

### MPC7xxx Cold/Warm Boot Initialization Sequence (Assembly)

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/board/evb64260/bootseq.txt

Handles core system initialization for both cold and warm boots, including cache management, memory configuration, address translation, and setting up the initial execution environment in flash.

```assembly
boot_cold:
boot_warm:
    clear bats
    init l2 (if enabled)
    init altivec (if enabled)
    invalidate l2 (if enabled)
    setup bats (from defines in config_EVB)
    enable_addr_trans: (if MMU enabled)
	enable MSR_IR and MSR_DR
    jump to in_flash
```

--------------------------------

### MPC7xxx Flash Execution and DRAM Initialization (Assembly)

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/board/evb64260/bootseq.txt

Sets up the L1 data cache and initializes the SDRAM. This involves configuring memory timings, detecting DIMM configurations, and setting up various bus and device timings.

```assembly
in_flash:
    enable l1 dcache
    gal_low_init: (board/evb64260/sdram_init.S)
	config SDRAM (CFG, TIMING, DECODE)
	init scratch regs (810 + 814)

	detect DIMM0 (bank 0 only)
	config SDRAM_PARA0 to 256/512Mbit
	bl sdram_op_mode
	detect bank0 width
	    write scratch reg 810
	config SDRAM_PARA0 with results
	config SDRAM_PARA1 with results

	detect DIMM1 (bank 2 only)
	config SDRAM_PARA2 to 256/512Mbit
	detect bank2 width
	    write scratch reg 814
	config SDRAM_PARA2 with results
	config SDRAM_PARA3 with results

	setup device bus timings/width
	setup boot device timings/width

	setup CPU_CONF (0x0)
	setup cpu master control register 0x160
	setup PCI0 TIMEOUT
	setup PCI1 TIMEOUT
	setup PCI0 BAR
	setup PCI1 BAR

	setup MPP control 0-3
	setup GPP level control
	setup Serial ports multiplex
```

--------------------------------

### C LZMA Encoder Initialization and Property Setting

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/lib/lzma/lzma.txt

Shows the process of initializing an LZMA encoder and setting its properties. This involves creating an encoder handle, initializing properties, and then applying these properties to the encoder.

```c
CLzmaEncHandle enc;

enc = LzmaEnc_Create(&g_Alloc);
if (enc == 0)
  return SZ_ERROR_MEM;

LzmaEncProps_Init(&props);

res = LzmaEnc_SetProps(enc, &props);
```

--------------------------------

### Define Board-Specific Clocks

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/doc/device-tree-bindings/clock/nvidia,tegra20-car.txt

Demonstrates the setup of fixed-frequency oscillator clocks at the board level and establishes the link to the Tegra20 CAR controller node. This is required to provide the 32KHz and oscillator inputs to the CAR module.

```dts
/ {
	clocks {
		#address-cells = <1>;
		#size-cells = <0>;

		osc: clock {
			compatible = "fixed-clock";
			#clock-cells = <0>;
			clock-frequency = <12000000>;
		};
	};

	i2c@7000d000 {
		pmic@34 {
			compatible = "ti,tps6586x";
			reg = <0x34>;

			clk_32k: clock {
				compatible = "fixed-clock";
				#clock-cells = <0>;
				clock-frequency = <32768>;
			};
		};
	};

	&tegra_car {
		clocks = <&clk_32k> <&osc>;
	};
};
```

--------------------------------

### Set OpenMPTCProuter LAN IP via SSH

Source: https://github.com/ysurac/openmptcprouter/wiki/OpenMPTCProuter-configuration

Updates the local area network IP address using the Unified Configuration Interface (UCI). This command modifies the network configuration, commits the changes, and initiates a system reboot to apply the new IP address.

```shell
uci set network.lan.ipaddr='your-static-ip-address' && uci commit && reboot
```

--------------------------------

### MPC7xxx Code Relocation and Board Initialization (C/Assembly)

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/board/evb64260/bootseq.txt

Manages the relocation of the executable code and clears the BSS section. It then calls the board-specific initialization function 'board_init_r' to set up board structures and function pointers.

```assembly
    setup monitor
    alloc board info struct
    init bd struct
    relocate_code: (cpu/mpc7xxx/start.S)
	    copy,got,clearbss
	    board_init_r(bd, dest_addr) (common/board.c)
		setup bd function pointers
```

--------------------------------

### Reboot device

Source: https://github.com/ysurac/openmptcprouter/wiki/Router-install

Execute a system reboot to apply changes and initiate the new firmware environment.

```shell
reboot
```

--------------------------------

### Transfer firmware image via SCP

Source: https://github.com/ysurac/openmptcprouter/wiki/Router-install

Securely copy the OpenWrt factory image to the router's temporary directory using the root credentials configured in the device Web-UI.

```shell
scp -O openmptcprouter-*-factory.ubi root@192.168.1.1:/tmp
```

--------------------------------

### Flash firmware to device memory

Source: https://github.com/ysurac/openmptcprouter/wiki/Router-install

Utilize the ubiformat command to write the factory firmware image directly to the specified MTD device partition.

```shell
ubiformat /dev/mtd16 -y -f /tmp/openwrt-factory.bin
```

--------------------------------

### Loading Indicator Animation (CSS)

Source: https://github.com/ysurac/openmptcprouter/blob/develop/common/package/boot/uboot-ipq40xx/src/httpd/vendors/oem/flashing.html

This CSS code defines a spinning loading indicator animation. It uses keyframes to rotate an element, creating a visual cue for ongoing processes. No external dependencies are required.

```css
h1,p,body{margin:0;padding:0}html,body{font:13px/20px Tahoma,sans-serif;background:#FFF;color:#000;text-align:center;height:100%}#m{padding:30px 0}#m>*{padding:20px}h1{font:bold 40px/40px Arial}#l{height:30px;width:30px;margin:30px auto;-webkit-animation:r 1s infinite linear;-moz-animation:r 1s infinite linear;-o-animation:r 1s infinite linear;animation:r 1s infinite linear;border-left:5px solid #FFF;border-right:5px solid #FFF;border-bottom:5px solid #000;border-top:5px solid #000;border-radius:100%}@-webkit-keyframes r{from{-webkit-transform:rotate(0deg)}to{-webkit-transform:rotate(359deg)}}@-moz-keyframes r{from{-moz-transform:rotate(0deg)}to{-moz-transform:rotate(359deg)}}@-o-keyframes r{from{-o-transform:rotate(0deg)}to{-o-transform:rotate(359deg)}}@keyframes r{from{transform:rotate(0deg)}to{transform:rotate(359deg)}}
```
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