wg: c_acc doesn't need to be initialized

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: fight compiler slightly harder

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

noise: store clamped key instead of raw key

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

highlighter: when subtracting char, cast to unsigned

Windows.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

systemd: wg-quick should depend on nss-lookup.target

Since wg-quick(8) calls wg(8) which does hostname lookups, we should
probably only run this after we're allowed to look up hostnames.

Reported-by: Anton Castelli <anton.c42@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: remove unused check phony declaration

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: freebsd: allow loopback to work

FreeBSD adds a route for point-to-point destination addresses. We don't
really want to specify any destination address, but unfortunately we
have to. Before we tried to cheat by giving our own address as the
destination, but this had the unfortunate effect of preventing
loopback from working on our local ip address. We work around this with
yet another kludge: we set the destination address to 127.0.0.1. Since
127.0.0.1 is already assigned to an interface, this has the same effect
of not specifying a destination address, and therefore we accomplish the
intended behavior.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

netlink: use __kernel_timespec for handshake time

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

contrib: introduce simple highlighter library

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

global: normalize -> clamp

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

keygen-html: bring back pure javascript implementation

This reverts commit 9d5baf7d1d14ca7eb0852b41566330259229d489.

Benoît Viguier has proofs that values will stay well within 2^53. We
also have an improved carry function that's much simpler.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Kconfig: IPsec isn't IPSec

Reported-by: Raf Czlonka <rczlonka@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

global: update copyright

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: curve25519: handle unaligned loads/stores safely

Reported-by: Chris Hewitt <chris@chrishewitt.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

makefile: use immediate expansion and use correct template patterns

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: bring interface up while setting MTU

This avoids another ip(8) invocation for little benefit.
Confirmed to work with iproute2 and busybox.

Signed-off-by: Aaron Jones <aaronmdjones@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

embeddable-wg-library: do not warn on unrecognized netlink attributes

This is a follow up of bcf8684c9ec90fe0d283a67d1654d05fb3eae019.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

global: various formatting tweeks

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: android: do not choke on empty allowed-ips

Reported-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

keygen-html: add missing glue macro

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg.8: AllowedIPs isn't actually required

An empty allowed IPs is totally valid, for folks wishing to move IP
addresses between multiple peers atomically.

Suggested-by: Comex <comexk@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg.8: specify that wg(8) shows runtime info too

Suggested-by: Comex <comexk@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: wait for interface to disappear on freebsd

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: don't fail if a netlink interface dump is inconsistent

Netlink returns NLM_F_DUMP_INTR if the set of all tunnels changed
during the dump. That's unfortunate, but is pretty common on busy
systems that are adding and removing tunnels all the time. Rather
than retrying, potentially indefinitely, we just work with the
partial results.

Reported-by: Robert Gerus <ar@is-a.cat>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: compile on gnu99

We don't actually use any C11 features, so we can at least compile with
ancient gcc.

Reported-by: Aaron M. D. Jones <aaronmdjones@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: use libc's endianness macro if no compiler macro

This lets us be compiled with ancient gcc.

Reported-by: Jeff Brandt <jeff@jeffcolo.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

global: rename struct wireguard_ to struct wg_

This required a bit of pruning of our christmas trees.

Suggested-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

netlink: do not stuff index into nla type

It's not used for anything, and LKML doesn't like the type being used as
an index value.

Suggested-by: Eugene Syromiatnikov <esyr@redhat.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

crypto: clean up remaining .h->.c

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick.8: add policy routing example

Suggested-by: Toke Høiland-Jørgensen <toke@toke.dk>
Suggested-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

crypto: make constant naming scheme consistent

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

global: put SPDX identifier on its own line

The kernel has very specific rules correlating file type with comment
type, and also SPDX identifiers can't be merged with other comments.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

global: prefer sizeof(*pointer) when possible

Suggested-by: Sultan Alsawaf <sultanxda@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

crypto: import zinc

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: ipc: do not warn on unrecognized netlink attributes

It makes extending things more difficult.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

crypto: use unaligned helpers

This is not useful for WireGuard, but for the general use case we
probably want it this way, and the speed difference is mostly lost in
the noise.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: check correct variable for route deduplication

Reported-by: John Sager <john@sager.me.uk>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: prefer system paths for tools

The only things wg-quick(8) needs from Homebrew are bash(1) and wg(8).
Other than that, it's explicitly coded against the native system
utilities. Since wg-quick(8) and bash(1) are invoked in auto_su by their
full absolute path (via $SELF and $BASH, respectively), we can simply
set the $PATH to be prefixed by the default system binary paths. This
way, if users install tools that conflict with system tools -- such as
GNU coreutils -- we won't accidently call those.

Reported-by: Deirdre Connolly <durumcrustulum@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: android: remove compat code

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: android: allow package to be overridden

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

embeddable-wg-library: do not left shift negative numbers

Otherwise we incur undefined behavior.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: allow link local default gateway

It's unclear why it was like this in the first place, but it apparently
broke certain IPv6 setups.

Reported-by: Jonas Blahut <j@die-blahuts.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: only error on wg show if all interfaces fail

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: android: support excluding applications

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: android: prevent outgoing handshake packets from being dropped

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: fix misspelling of strchrnul in comment

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

manpages: eliminate whitespace at the end of the line

This eliminates a few style warnings from "mandoc -T lint src/tools/wg*.8".

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: android: don't forget to free compiled regexes

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: android: disable roaming to v6 networks when v4 is specified

This works around an unfortunate bug in 464XLAT transitions.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

dns-hatchet: apply resolv.conf's selinux context to new resolv.conf

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: getentropy requires 10.12

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: support getentropy(3)

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: encoding: add missing static array constraints

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: android: change name of intent

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: android: delay setting users until end

`ndc users add` eventually invokes SOCK_DESTROY on user sockets, causing
them to reconnect. By delaying this until after routes are set, we
ensure that the sockets reconnect using the tunnel, rather than the old
route.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: constanter time encoding

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: set DNS servers after delay on route change

This works around a race condition in macOS's network daemons, while
also adding one in the form of possibly calling kill -ALRM on a stale
PID; unfortunately bash can't wait from a trap.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: freebsd: configure as p2p link

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: add multiple IP addresses

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: determine IPs when saving interface

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: freebsd: work around security vulnerabilities in bash

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: allow enumeration of socket files

These OSes have an unpriv'd ifconfig, so this isn't an even larger info
leak.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: better bash completion for non-renaming OSes

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: support FreeBSD/Darwin search path

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: always pass -v as first argument to install

This lets crippled OSes sed out our -v more easily.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: openbsd: add new implementation

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: freebsd: add new implementation

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: do not remove routes when no real interface

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: rename namefile environment variable

This paves the way for an openbsd implementation.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: fix OpenBSD build

License: MIT
Signed-off-by: Filippo Valsorda <valsorda@google.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ncat-client-server: do not always call sudo and use env bash

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: fix errno propagation and messages

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: simpler inclusion check

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: reorder functions

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: networksetup does not like missing stdio

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: avoid routing loop if no default

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: sometimes there are no network services

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: use invoking shell in auto rooting

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: add intentionally undocumented userspace implementation knob

This knob might disappear at some point, and we don't want to encourage
its use, so it's not being documented, but this should help with
development of new implementations.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: use bash from environment and require bash 4+

For properly configured Homebrew installations /usr/local/bin should be
before /bin, so this should still work. This allows the script to be
used in more than one setting.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: restore DNS on down

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: bash correctness

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: remove v6 routes after shutdown

This works around a Darwin kernel bug regarding interface removal.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: darwin: ensure socket directory exists

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

dns-hatchet: update paths

Suggested-by: Martin Hauke <mardnh@gmx.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ncat-client-server: add wg-quick variant

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: add darwin implementation

It's pretty rough and leaves much to be desired, but it works.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: add wg symlink

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: add android implementation

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg: reorganize for multiplatform wg-quick

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: preliminary support for go implementation

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

embeddable-wg-library: zero attribute padding

See: http://git.netfilter.org/libmnl/commit/?id=37c876b55a2c00424ccda5a300ab5fdec1d88b22
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

keygen-html: add zip file example

A little bit more JavaScript for easy copy&pasting.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: account for specified fwmark in auto routing mode

If we're doing automatic routing with default routes, but the config has
also specified an explicit fwmark, then use that explicit fwmark, even
if it's conflicting, since the administrator has explicitly opted into
using it. Also, when shutting down the interface, we only now remove the
fancy rules if we're in automatic routing mode with default routes.

Suggested-by: Luis Ressel <aranea@aixah.de>
Reported-by: Saeid Akbari <saeidscorp@yahoo.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick.8: fix typo

Reported-by: Mike Pechkin <mike.pechkin@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: hide errors on save

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

contrib: add extract-handshakes kprobe example

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: if resolvconf/run/iface exists, use it

Some older broken resolvconfs don't support resolvconf -l, but do have a
file in a standard location, so use it.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

wg-quick: if resolvconf/interface-order exists, use it

Some older broken resolvconf implementations ignore -m, but do have an
interface-order list. It's better to use this list dynamically, in case
it changes, or in case it's not used by the OS's resolvconf
implementation, such as in the case of systemd or openresolv.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

global: in gnu code, use un-underscored asm

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>