1// SPDX-License-Identifier: GPL-2.0-or-later
2/* rxrpc network namespace handling.
3 *
4 * Copyright (C) 2017 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#include <linux/proc_fs.h>
9#include "ar-internal.h"
10
11unsigned int rxrpc_net_id;
12
13static void rxrpc_service_conn_reap_timeout(struct timer_list *timer)
14{
15	struct rxrpc_net *rxnet =
16		container_of(timer, struct rxrpc_net, service_conn_reap_timer);
17
18	if (rxnet->live)
19		rxrpc_queue_work(&rxnet->service_conn_reaper);
20}
21
22static void rxrpc_peer_keepalive_timeout(struct timer_list *timer)
23{
24	struct rxrpc_net *rxnet =
25		container_of(timer, struct rxrpc_net, peer_keepalive_timer);
26
27	if (rxnet->live)
28		rxrpc_queue_work(&rxnet->peer_keepalive_work);
29}
30
31/*
32 * Initialise a per-network namespace record.
33 */
34static __net_init int rxrpc_init_net(struct net *net)
35{
36	struct rxrpc_net *rxnet = rxrpc_net(net);
37	int ret, i;
38
39	rxnet->live = true;
40	get_random_bytes(&rxnet->epoch, sizeof(rxnet->epoch));
41	rxnet->epoch |= RXRPC_RANDOM_EPOCH;
42
43	INIT_LIST_HEAD(&rxnet->calls);
44	spin_lock_init(&rxnet->call_lock);
45	atomic_set(&rxnet->nr_calls, 1);
46
47	atomic_set(&rxnet->nr_conns, 1);
48	INIT_LIST_HEAD(&rxnet->bundle_proc_list);
49	INIT_LIST_HEAD(&rxnet->conn_proc_list);
50	INIT_LIST_HEAD(&rxnet->service_conns);
51	rwlock_init(&rxnet->conn_lock);
52	INIT_WORK(&rxnet->service_conn_reaper,
53		  rxrpc_service_connection_reaper);
54	timer_setup(&rxnet->service_conn_reap_timer,
55		    rxrpc_service_conn_reap_timeout, 0);
56
57	atomic_set(&rxnet->nr_client_conns, 0);
58
59	INIT_HLIST_HEAD(&rxnet->local_endpoints);
60	mutex_init(&rxnet->local_mutex);
61
62	hash_init(rxnet->peer_hash);
63	spin_lock_init(&rxnet->peer_hash_lock);
64	for (i = 0; i < ARRAY_SIZE(rxnet->peer_keepalive); i++)
65		INIT_LIST_HEAD(&rxnet->peer_keepalive[i]);
66	INIT_LIST_HEAD(&rxnet->peer_keepalive_new);
67	timer_setup(&rxnet->peer_keepalive_timer,
68		    rxrpc_peer_keepalive_timeout, 0);
69	INIT_WORK(&rxnet->peer_keepalive_work, rxrpc_peer_keepalive_worker);
70	rxnet->peer_keepalive_base = ktime_get_seconds();
71
72	ret = -ENOMEM;
73	rxnet->proc_net = proc_net_mkdir(net, "rxrpc", net->proc_net);
74	if (!rxnet->proc_net)
75		goto err_proc;
76
77	proc_create_net("calls", 0444, rxnet->proc_net, &rxrpc_call_seq_ops,
78			sizeof(struct seq_net_private));
79	proc_create_net("conns", 0444, rxnet->proc_net,
80			&rxrpc_connection_seq_ops,
81			sizeof(struct seq_net_private));
82	proc_create_net("bundles", 0444, rxnet->proc_net,
83			&rxrpc_bundle_seq_ops,
84			sizeof(struct seq_net_private));
85	proc_create_net("peers", 0444, rxnet->proc_net,
86			&rxrpc_peer_seq_ops,
87			sizeof(struct seq_net_private));
88	proc_create_net("locals", 0444, rxnet->proc_net,
89			&rxrpc_local_seq_ops,
90			sizeof(struct seq_net_private));
91	proc_create_net_single_write("stats", S_IFREG | 0644, rxnet->proc_net,
92				     rxrpc_stats_show, rxrpc_stats_clear, NULL);
93	return 0;
94
95err_proc:
96	rxnet->live = false;
97	return ret;
98}
99
100/*
101 * Clean up a per-network namespace record.
102 */
103static __net_exit void rxrpc_exit_net(struct net *net)
104{
105	struct rxrpc_net *rxnet = rxrpc_net(net);
106
107	rxnet->live = false;
108	del_timer_sync(&rxnet->peer_keepalive_timer);
109	cancel_work_sync(&rxnet->peer_keepalive_work);
110	/* Remove the timer again as the worker may have restarted it. */
111	del_timer_sync(&rxnet->peer_keepalive_timer);
112	rxrpc_destroy_all_calls(rxnet);
113	rxrpc_destroy_all_connections(rxnet);
114	rxrpc_destroy_all_peers(rxnet);
115	rxrpc_destroy_all_locals(rxnet);
116	proc_remove(rxnet->proc_net);
117}
118
119struct pernet_operations rxrpc_net_ops = {
120	.init	= rxrpc_init_net,
121	.exit	= rxrpc_exit_net,
122	.id	= &rxrpc_net_id,
123	.size	= sizeof(struct rxrpc_net),
124};
125