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/* Copyright (C) 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
#ifndef PEER_H
#define PEER_H
#include "device.h"
#include "noise.h"
#include "cookie.h"
#include <linux/types.h>
#include <linux/netfilter.h>
#include <linux/spinlock.h>
#include <linux/kref.h>
#include <net/dst_cache.h>
struct wireguard_device;
struct endpoint {
union {
struct sockaddr addr;
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
};
union {
struct {
struct in_addr src4;
int src_if4; /* Essentially the same as addr6->scope_id */
};
struct in6_addr src6;
};
};
struct wireguard_peer {
struct wireguard_device *device;
struct crypt_queue tx_queue, rx_queue;
struct sk_buff_head staged_packet_queue;
int serial_work_cpu;
struct noise_keypairs keypairs;
struct endpoint endpoint;
struct dst_cache endpoint_cache;
rwlock_t endpoint_lock;
struct noise_handshake handshake;
u64 last_sent_handshake;
struct work_struct transmit_handshake_work, clear_peer_work;
struct cookie latest_cookie;
struct hlist_node pubkey_hash;
u64 rx_bytes, tx_bytes;
struct timer_list timer_retransmit_handshake, timer_send_keepalive, timer_new_handshake, timer_zero_key_material, timer_persistent_keepalive;
unsigned int timer_handshake_attempts;
unsigned long persistent_keepalive_interval;
bool timers_enabled, timer_need_another_keepalive, sent_lastminute_handshake;
struct timeval walltime_last_handshake;
struct kref refcount;
struct rcu_head rcu;
struct list_head peer_list;
u64 internal_id;
};
struct wireguard_peer *peer_create(struct wireguard_device *wg, const u8 public_key[NOISE_PUBLIC_KEY_LEN], const u8 preshared_key[NOISE_SYMMETRIC_KEY_LEN]);
struct wireguard_peer *peer_get(struct wireguard_peer *peer);
struct wireguard_peer *peer_rcu_get(struct wireguard_peer *peer);
void peer_put(struct wireguard_peer *peer);
void peer_remove(struct wireguard_peer *peer);
void peer_remove_all(struct wireguard_device *wg);
struct wireguard_peer *peer_lookup_by_index(struct wireguard_device *wg, u32 index);
unsigned int peer_total_count(struct wireguard_device *wg);
/* This is a macro iterator of essentially this:
*
* if (__should_lock)
* mutex_lock(&(__wg)->device_update_lock);
* else
* lockdep_assert_held(&(__wg)->device_update_lock)
* list_for_each_entry_safe (__peer, __temp, &(__wg)->peer_list, peer_list) {
* __peer = peer_rcu_get(__peer);
* if (!__peer)
* continue;
* ITERATOR_BODY
* peer_put(__peer);
* }
* if (__should_lock)
* mutex_unlock(&(__wg)->device_update_lock);
*
* While it's really ugly to look at, the code gcc produces from it is actually perfect.
*/
#define pfe_label(n) __PASTE(__PASTE(pfe_label_, n ## _), __LINE__)
#define peer_for_each(__wg, __peer, __temp, __should_lock) \
if (1) { if (__should_lock) mutex_lock(&(__wg)->device_update_lock); else lockdep_assert_held(&(__wg)->device_update_lock); goto pfe_label(1); } else pfe_label(1): \
if (1) goto pfe_label(2); else while (1) if (1) { if (__should_lock) mutex_unlock(&(__wg)->device_update_lock); break; } else pfe_label(2): \
list_for_each_entry_safe (__peer, __temp, &(__wg)->peer_list, peer_list) \
if (0) pfe_label(3): break; else \
if (0); else for (__peer = peer_rcu_get(peer); __peer;) if (1) { goto pfe_label(4); pfe_label(5): break; } else while (1) if (1) goto pfe_label(5); else pfe_label(4): \
if (1) { goto pfe_label(6); pfe_label(7):; } else while (1) if (1) goto pfe_label(3); else while (1) if (1) goto pfe_label(7); else pfe_label(6): \
if (1) { goto pfe_label(8); pfe_label(9): peer_put(__peer); break; pfe_label(10): peer_put(__peer); } else while (1) if (1) goto pfe_label(9); else while (1) if (1) goto pfe_label(10); else pfe_label(8):
#endif
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