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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 <Jason@zx2c4.com> Cc: David Miller <davem@davemloft.net> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#ifndef _WG_NOISE_H
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#define _WG_NOISE_H
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#include "messages.h"
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#include "peerlookup.h"
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/atomic.h>
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#include <linux/rwsem.h>
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#include <linux/mutex.h>
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#include <linux/kref.h>
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union noise_counter {
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struct {
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u64 counter;
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unsigned long backtrack[COUNTER_BITS_TOTAL / BITS_PER_LONG];
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spinlock_t lock;
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} receive;
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atomic64_t counter;
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};
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struct noise_symmetric_key {
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u8 key[NOISE_SYMMETRIC_KEY_LEN];
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union noise_counter counter;
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u64 birthdate;
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bool is_valid;
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};
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struct noise_keypair {
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struct index_hashtable_entry entry;
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struct noise_symmetric_key sending;
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struct noise_symmetric_key receiving;
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__le32 remote_index;
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bool i_am_the_initiator;
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struct kref refcount;
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struct rcu_head rcu;
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u64 internal_id;
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};
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struct noise_keypairs {
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struct noise_keypair __rcu *current_keypair;
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struct noise_keypair __rcu *previous_keypair;
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struct noise_keypair __rcu *next_keypair;
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spinlock_t keypair_update_lock;
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};
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struct noise_static_identity {
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u8 static_public[NOISE_PUBLIC_KEY_LEN];
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u8 static_private[NOISE_PUBLIC_KEY_LEN];
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struct rw_semaphore lock;
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bool has_identity;
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};
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enum noise_handshake_state {
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HANDSHAKE_ZEROED,
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HANDSHAKE_CREATED_INITIATION,
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HANDSHAKE_CONSUMED_INITIATION,
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HANDSHAKE_CREATED_RESPONSE,
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HANDSHAKE_CONSUMED_RESPONSE
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};
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struct noise_handshake {
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struct index_hashtable_entry entry;
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enum noise_handshake_state state;
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u64 last_initiation_consumption;
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struct noise_static_identity *static_identity;
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u8 ephemeral_private[NOISE_PUBLIC_KEY_LEN];
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u8 remote_static[NOISE_PUBLIC_KEY_LEN];
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u8 remote_ephemeral[NOISE_PUBLIC_KEY_LEN];
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u8 precomputed_static_static[NOISE_PUBLIC_KEY_LEN];
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u8 preshared_key[NOISE_SYMMETRIC_KEY_LEN];
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u8 hash[NOISE_HASH_LEN];
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u8 chaining_key[NOISE_HASH_LEN];
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u8 latest_timestamp[NOISE_TIMESTAMP_LEN];
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__le32 remote_index;
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/* Protects all members except the immutable (after noise_handshake_
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* init): remote_static, precomputed_static_static, static_identity.
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*/
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struct rw_semaphore lock;
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};
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struct wg_device;
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void wg_noise_init(void);
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bool wg_noise_handshake_init(struct noise_handshake *handshake,
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struct noise_static_identity *static_identity,
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const u8 peer_public_key[NOISE_PUBLIC_KEY_LEN],
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const u8 peer_preshared_key[NOISE_SYMMETRIC_KEY_LEN],
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struct wg_peer *peer);
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void wg_noise_handshake_clear(struct noise_handshake *handshake);
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static inline void wg_noise_reset_last_sent_handshake(atomic64_t *handshake_ns)
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{
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atomic64_set(handshake_ns, ktime_get_coarse_boottime_ns() -
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(u64)(REKEY_TIMEOUT + 1) * NSEC_PER_SEC);
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}
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void wg_noise_keypair_put(struct noise_keypair *keypair, bool unreference_now);
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struct noise_keypair *wg_noise_keypair_get(struct noise_keypair *keypair);
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void wg_noise_keypairs_clear(struct noise_keypairs *keypairs);
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bool wg_noise_received_with_keypair(struct noise_keypairs *keypairs,
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struct noise_keypair *received_keypair);
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void wg_noise_expire_current_peer_keypairs(struct wg_peer *peer);
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void wg_noise_set_static_identity_private_key(
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struct noise_static_identity *static_identity,
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const u8 private_key[NOISE_PUBLIC_KEY_LEN]);
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bool wg_noise_precompute_static_static(struct wg_peer *peer);
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bool
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wg_noise_handshake_create_initiation(struct message_handshake_initiation *dst,
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struct noise_handshake *handshake);
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struct wg_peer *
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wg_noise_handshake_consume_initiation(struct message_handshake_initiation *src,
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struct wg_device *wg);
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bool wg_noise_handshake_create_response(struct message_handshake_response *dst,
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struct noise_handshake *handshake);
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struct wg_peer *
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wg_noise_handshake_consume_response(struct message_handshake_response *src,
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struct wg_device *wg);
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bool wg_noise_handshake_begin_session(struct noise_handshake *handshake,
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struct noise_keypairs *keypairs);
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#endif /* _WG_NOISE_H */
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