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net: WireGuard secure network tunnel
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WireGuard is a layer 3 secure networking tunnel made specifically for
the kernel, that aims to be much simpler and easier to audit than IPsec.
Extensive documentation and description of the protocol and
considerations, along with formal proofs of the cryptography, are
available at:

  * https://www.wireguard.com/
  * https://www.wireguard.com/papers/wireguard.pdf

This commit implements WireGuard as a simple network device driver,
accessible in the usual RTNL way used by virtual network drivers. It
makes use of the udp_tunnel APIs, GRO, GSO, NAPI, and the usual set of
networking subsystem APIs. It has a somewhat novel multicore queueing
system designed for maximum throughput and minimal latency of encryption
operations, but it is implemented modestly using workqueues and NAPI.
Configuration is done via generic Netlink, and following a review from
the Netlink maintainer a year ago, several high profile userspace tools
have already implemented the API.

This commit also comes with several different tests, both in-kernel
tests and out-of-kernel tests based on network namespaces, taking profit
of the fact that sockets used by WireGuard intentionally stay in the
namespace the WireGuard interface was originally created, exactly like
the semantics of userspace tun devices. See wireguard.com/netns/ for
pictures and examples.

The source code is fairly short, but rather than combining everything
into a single file, WireGuard is developed as cleanly separable files,
making auditing and comprehension easier. Things are laid out as
follows:

  * noise.[ch], cookie.[ch], messages.h: These implement the bulk of the
    cryptographic aspects of the protocol, and are mostly data-only in
    nature, taking in buffers of bytes and spitting out buffers of
    bytes. They also handle reference counting for their various shared
    pieces of data, like keys and key lists.

  * ratelimiter.[ch]: Used as an integral part of cookie.[ch] for
    ratelimiting certain types of cryptographic operations in accordance
    with particular WireGuard semantics.

  * allowedips.[ch], peerlookup.[ch]: The main lookup structures of
    WireGuard, the former being trie-like with particular semantics, an
    integral part of the design of the protocol, and the latter just
    being nice helper functions around the various hashtables we use.

  * device.[ch]: Implementation of functions for the netdevice and for
    rtnl, responsible for maintaining the life of a given interface and
    wiring it up to the rest of WireGuard.

  * peer.[ch]: Each interface has a list of peers, with helper functions
    available here for creation, destruction, and reference counting.

  * socket.[ch]: Implementation of functions related to udp_socket and
    the general set of kernel socket APIs, for sending and receiving
    ciphertext UDP packets, and taking care of WireGuard-specific sticky
    socket routing semantics for the automatic roaming.

  * netlink.[ch]: Userspace API entry point for configuring WireGuard
    peers and devices. The API has been implemented by several userspace
    tools and network management utility, and the WireGuard project
    distributes the basic wg(8) tool.

  * queueing.[ch]: Shared function on the rx and tx path for handling
    the various queues used in the multicore algorithms.

  * send.c: Handles encrypting outgoing packets in parallel on
    multiple cores, before sending them in order on a single core, via
    workqueues and ring buffers. Also handles sending handshake and cookie
    messages as part of the protocol, in parallel.

  * receive.c: Handles decrypting incoming packets in parallel on
    multiple cores, before passing them off in order to be ingested via
    the rest of the networking subsystem with GRO via the typical NAPI
    poll function. Also handles receiving handshake and cookie messages
    as part of the protocol, in parallel.

  * timers.[ch]: Uses the timer wheel to implement protocol particular
    event timeouts, and gives a set of very simple event-driven entry
    point functions for callers.

  * main.c, version.h: Initialization and deinitialization of the module.

  * selftest/*.h: Runtime unit tests for some of the most security
    sensitive functions.

  * tools/testing/selftests/wireguard/netns.sh: Aforementioned testing
    script using network namespaces.

This commit aims to be as self-contained as possible, implementing
WireGuard as a standalone module not needing much special handling or
coordination from the network subsystem. I expect for future
optimizations to the network stack to positively improve WireGuard, and
vice-versa, but for the time being, this exists as intentionally
standalone.

We introduce a menu option for CONFIG_WIREGUARD, as well as providing a
verbose debug log and self-tests via CONFIG_WIREGUARD_DEBUG.

Signed-off-by: Jason A. Donenfeld <[email protected]>
Cc: David Miller <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: David S. Miller <[email protected]>
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zx2c4 authored and davem330 committed Dec 9, 2019
1 parent e42617b commit e7096c1
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8 changes: 8 additions & 0 deletions MAINTAINERS
Original file line number Diff line number Diff line change
Expand Up @@ -17850,6 +17850,14 @@ L: [email protected]
S: Maintained
F: drivers/gpio/gpio-ws16c48.c

WIREGUARD SECURE NETWORK TUNNEL
M: Jason A. Donenfeld <[email protected]>
S: Maintained
F: drivers/net/wireguard/
F: tools/testing/selftests/wireguard/
L: [email protected]
L: [email protected]

WISTRON LAPTOP BUTTON DRIVER
M: Miloslav Trmac <[email protected]>
S: Maintained
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41 changes: 41 additions & 0 deletions drivers/net/Kconfig
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Expand Up @@ -71,6 +71,47 @@ config DUMMY
To compile this driver as a module, choose M here: the module
will be called dummy.

config WIREGUARD
tristate "WireGuard secure network tunnel"
depends on NET && INET
depends on IPV6 || !IPV6
select NET_UDP_TUNNEL
select DST_CACHE
select CRYPTO
select CRYPTO_LIB_CURVE25519
select CRYPTO_LIB_CHACHA20POLY1305
select CRYPTO_LIB_BLAKE2S
select CRYPTO_CHACHA20_X86_64 if X86 && 64BIT
select CRYPTO_POLY1305_X86_64 if X86 && 64BIT
select CRYPTO_BLAKE2S_X86 if X86 && 64BIT
select CRYPTO_CURVE25519_X86 if X86 && 64BIT
select CRYPTO_CHACHA20_NEON if (ARM || ARM64) && KERNEL_MODE_NEON
select CRYPTO_POLY1305_NEON if ARM64 && KERNEL_MODE_NEON
select CRYPTO_POLY1305_ARM if ARM
select CRYPTO_CURVE25519_NEON if ARM && KERNEL_MODE_NEON
select CRYPTO_CHACHA_MIPS if CPU_MIPS32_R2
select CRYPTO_POLY1305_MIPS if CPU_MIPS32 || (CPU_MIPS64 && 64BIT)
help
WireGuard is a secure, fast, and easy to use replacement for IPSec
that uses modern cryptography and clever networking tricks. It's
designed to be fairly general purpose and abstract enough to fit most
use cases, while at the same time remaining extremely simple to
configure. See www.wireguard.com for more info.

It's safe to say Y or M here, as the driver is very lightweight and
is only in use when an administrator chooses to add an interface.

config WIREGUARD_DEBUG
bool "Debugging checks and verbose messages"
depends on WIREGUARD
help
This will write log messages for handshake and other events
that occur for a WireGuard interface. It will also perform some
extra validation checks and unit tests at various points. This is
only useful for debugging.

Say N here unless you know what you're doing.

config EQUALIZER
tristate "EQL (serial line load balancing) support"
---help---
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1 change: 1 addition & 0 deletions drivers/net/Makefile
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Expand Up @@ -10,6 +10,7 @@ obj-$(CONFIG_BONDING) += bonding/
obj-$(CONFIG_IPVLAN) += ipvlan/
obj-$(CONFIG_IPVTAP) += ipvlan/
obj-$(CONFIG_DUMMY) += dummy.o
obj-$(CONFIG_WIREGUARD) += wireguard/
obj-$(CONFIG_EQUALIZER) += eql.o
obj-$(CONFIG_IFB) += ifb.o
obj-$(CONFIG_MACSEC) += macsec.o
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18 changes: 18 additions & 0 deletions drivers/net/wireguard/Makefile
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@@ -0,0 +1,18 @@
ccflags-y := -O3
ccflags-y += -D'pr_fmt(fmt)=KBUILD_MODNAME ": " fmt'
ccflags-$(CONFIG_WIREGUARD_DEBUG) += -DDEBUG
wireguard-y := main.o
wireguard-y += noise.o
wireguard-y += device.o
wireguard-y += peer.o
wireguard-y += timers.o
wireguard-y += queueing.o
wireguard-y += send.o
wireguard-y += receive.o
wireguard-y += socket.o
wireguard-y += peerlookup.o
wireguard-y += allowedips.o
wireguard-y += ratelimiter.o
wireguard-y += cookie.o
wireguard-y += netlink.o
obj-$(CONFIG_WIREGUARD) := wireguard.o
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