6 #include "peer.h"
25 	struct wg_peer *peer;  in wg_peer_create()  local
33 	peer = kmem_cache_zalloc(peer_cache, GFP_KERNEL);  in wg_peer_create()
34 	if (unlikely(!peer))  in wg_peer_create()
36 	if (unlikely(dst_cache_init(&peer->endpoint_cache, GFP_KERNEL)))  in wg_peer_create()
39 	peer->device = wg;  in wg_peer_create()
40 	wg_noise_handshake_init(&peer->handshake, &wg->static_identity,  in wg_peer_create()
41 				public_key, preshared_key, peer);  in wg_peer_create()
42 	peer->internal_id = atomic64_inc_return(&peer_counter);  in wg_peer_create()
43 	peer->serial_work_cpu = nr_cpumask_bits;  in wg_peer_create()
44 	wg_cookie_init(&peer->latest_cookie);  in wg_peer_create()
45 	wg_timers_init(peer);  in wg_peer_create()
46 	wg_cookie_checker_precompute_peer_keys(peer);  in wg_peer_create()
47 	spin_lock_init(&peer->keypairs.keypair_update_lock);  in wg_peer_create()
48 	INIT_WORK(&peer->transmit_handshake_work, wg_packet_handshake_send_worker);  in wg_peer_create()
49 	INIT_WORK(&peer->transmit_packet_work, wg_packet_tx_worker);  in wg_peer_create()
50 	wg_prev_queue_init(&peer->tx_queue);  in wg_peer_create()
51 	wg_prev_queue_init(&peer->rx_queue);  in wg_peer_create()
52 	rwlock_init(&peer->endpoint_lock);  in wg_peer_create()
53 	kref_init(&peer->refcount);  in wg_peer_create()
54 	skb_queue_head_init(&peer->staged_packet_queue);  in wg_peer_create()
55 	wg_noise_reset_last_sent_handshake(&peer->last_sent_handshake);  in wg_peer_create()
56 	set_bit(NAPI_STATE_NO_BUSY_POLL, &peer->napi.state);  in wg_peer_create()
57 	netif_napi_add(wg->dev, &peer->napi, wg_packet_rx_poll,  in wg_peer_create()
59 	napi_enable(&peer->napi);  in wg_peer_create()
60 	list_add_tail(&peer->peer_list, &wg->peer_list);  in wg_peer_create()
61 	INIT_LIST_HEAD(&peer->allowedips_list);  in wg_peer_create()
62 	wg_pubkey_hashtable_add(wg->peer_hashtable, peer);  in wg_peer_create()
64 	pr_debug("%s: Peer %llu created\n", wg->dev->name, peer->internal_id);  in wg_peer_create()
65 	return peer;  in wg_peer_create()
68 	kmem_cache_free(peer_cache, peer);  in wg_peer_create()
72 struct wg_peer *wg_peer_get_maybe_zero(struct wg_peer *peer)  in wg_peer_get_maybe_zero()  argument
75 			 "Taking peer reference without holding the RCU read lock");  in wg_peer_get_maybe_zero()
76 	if (unlikely(!peer || !kref_get_unless_zero(&peer->refcount)))  in wg_peer_get_maybe_zero()
78 	return peer;  in wg_peer_get_maybe_zero()
81 static void peer_make_dead(struct wg_peer *peer)  in peer_make_dead()  argument
84 	list_del_init(&peer->peer_list);  in peer_make_dead()
85 	wg_allowedips_remove_by_peer(&peer->device->peer_allowedips, peer,  in peer_make_dead()
86 				     &peer->device->device_update_lock);  in peer_make_dead()
87 	wg_pubkey_hashtable_remove(peer->device->peer_hashtable, peer);  in peer_make_dead()
90 	WRITE_ONCE(peer->is_dead, true);  in peer_make_dead()
95 static void peer_remove_after_dead(struct wg_peer *peer)  in peer_remove_after_dead()  argument
97 	WARN_ON(!peer->is_dead);  in peer_remove_after_dead()
99 	/* No more keypairs can be created for this peer, since is_dead protects  in peer_remove_after_dead()
102 	wg_noise_keypairs_clear(&peer->keypairs);  in peer_remove_after_dead()
107 	wg_timers_stop(peer);  in peer_remove_after_dead()
117 	flush_workqueue(peer->device->packet_crypt_wq);  in peer_remove_after_dead()
119 	flush_workqueue(peer->device->packet_crypt_wq);  in peer_remove_after_dead()
121 	napi_disable(&peer->napi);  in peer_remove_after_dead()
125 	netif_napi_del(&peer->napi);  in peer_remove_after_dead()
130 	flush_workqueue(peer->device->handshake_send_wq);  in peer_remove_after_dead()
132 	/* After the above flushes, a peer might still be active in a few  in peer_remove_after_dead()
145 	 * and in wg_cookie_message_consume, the lookup eventually gets a peer  in peer_remove_after_dead()
149 	--peer->device->num_peers;  in peer_remove_after_dead()
150 	wg_peer_put(peer);  in peer_remove_after_dead()
154  * a peer is currently operating will eventually come to an end and not pass
157 void wg_peer_remove(struct wg_peer *peer)  in wg_peer_remove()  argument
159 	if (unlikely(!peer))  in wg_peer_remove()
161 	lockdep_assert_held(&peer->device->device_update_lock);  in wg_peer_remove()
163 	peer_make_dead(peer);  in wg_peer_remove()
165 	peer_remove_after_dead(peer);  in wg_peer_remove()
170 	struct wg_peer *peer, *temp;  in wg_peer_remove_all()  local
178 	list_for_each_entry_safe(peer, temp, &wg->peer_list, peer_list) {  in wg_peer_remove_all()
179 		peer_make_dead(peer);  in wg_peer_remove_all()
180 		list_add_tail(&peer->peer_list, &dead_peers);  in wg_peer_remove_all()
183 	list_for_each_entry_safe(peer, temp, &dead_peers, peer_list)  in wg_peer_remove_all()
184 		peer_remove_after_dead(peer);  in wg_peer_remove_all()
189 	struct wg_peer *peer = container_of(rcu, struct wg_peer, rcu);  in rcu_release()  local
191 	dst_cache_destroy(&peer->endpoint_cache);  in rcu_release()
192 	WARN_ON(wg_prev_queue_peek(&peer->tx_queue) || wg_prev_queue_peek(&peer->rx_queue));  in rcu_release()
197 	memzero_explicit(peer, sizeof(*peer));  in rcu_release()
198 	kmem_cache_free(peer_cache, peer);  in rcu_release()
203 	struct wg_peer *peer = container_of(refcount, struct wg_peer, refcount);  in kref_release()  local
205 	pr_debug("%s: Peer %llu (%pISpfsc) destroyed\n",  in kref_release()
206 		 peer->device->dev->name, peer->internal_id,  in kref_release()
207 		 &peer->endpoint.addr);  in kref_release()
212 	wg_index_hashtable_remove(peer->device->index_hashtable,  in kref_release()
213 				  &peer->handshake.entry);  in kref_release()
218 	wg_packet_purge_staged_packets(peer);  in kref_release()
221 	call_rcu(&peer->rcu, rcu_release);  in kref_release()
224 void wg_peer_put(struct wg_peer *peer)  in wg_peer_put()  argument
226 	if (unlikely(!peer))  in wg_peer_put()
228 	kref_put(&peer->refcount, kref_release);  in wg_peer_put()