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->conn_proc_list);
 49	INIT_LIST_HEAD(&rxnet->service_conns);
 50	rwlock_init(&rxnet->conn_lock);
 51	INIT_WORK(&rxnet->service_conn_reaper,
 52		  rxrpc_service_connection_reaper);
 53	timer_setup(&rxnet->service_conn_reap_timer,
 54		    rxrpc_service_conn_reap_timeout, 0);
 55
 56	atomic_set(&rxnet->nr_client_conns, 0);
 57
 58	INIT_HLIST_HEAD(&rxnet->local_endpoints);
 59	mutex_init(&rxnet->local_mutex);
 60
 61	hash_init(rxnet->peer_hash);
 62	spin_lock_init(&rxnet->peer_hash_lock);
 63	for (i = 0; i < ARRAY_SIZE(rxnet->peer_keepalive); i++)
 64		INIT_LIST_HEAD(&rxnet->peer_keepalive[i]);
 65	INIT_LIST_HEAD(&rxnet->peer_keepalive_new);
 66	timer_setup(&rxnet->peer_keepalive_timer,
 67		    rxrpc_peer_keepalive_timeout, 0);
 68	INIT_WORK(&rxnet->peer_keepalive_work, rxrpc_peer_keepalive_worker);
 69	rxnet->peer_keepalive_base = ktime_get_seconds();
 70
 71	ret = -ENOMEM;
 72	rxnet->proc_net = proc_net_mkdir(net, "rxrpc", net->proc_net);
 73	if (!rxnet->proc_net)
 74		goto err_proc;
 75
 76	proc_create_net("calls", 0444, rxnet->proc_net, &rxrpc_call_seq_ops,
 77			sizeof(struct seq_net_private));
 78	proc_create_net("conns", 0444, rxnet->proc_net,
 79			&rxrpc_connection_seq_ops,
 80			sizeof(struct seq_net_private));
 81	proc_create_net("peers", 0444, rxnet->proc_net,
 82			&rxrpc_peer_seq_ops,
 83			sizeof(struct seq_net_private));
 84	proc_create_net("locals", 0444, rxnet->proc_net,
 85			&rxrpc_local_seq_ops,
 86			sizeof(struct seq_net_private));
 87	proc_create_net_single_write("stats", S_IFREG | 0644, rxnet->proc_net,
 88				     rxrpc_stats_show, rxrpc_stats_clear, NULL);
 89	return 0;
 90
 91err_proc:
 92	rxnet->live = false;
 93	return ret;
 94}
 95
 96/*
 97 * Clean up a per-network namespace record.
 98 */
 99static __net_exit void rxrpc_exit_net(struct net *net)
100{
101	struct rxrpc_net *rxnet = rxrpc_net(net);
102
103	rxnet->live = false;
104	del_timer_sync(&rxnet->peer_keepalive_timer);
105	cancel_work_sync(&rxnet->peer_keepalive_work);
106	/* Remove the timer again as the worker may have restarted it. */
107	del_timer_sync(&rxnet->peer_keepalive_timer);
108	rxrpc_destroy_all_calls(rxnet);
109	rxrpc_destroy_all_connections(rxnet);
110	rxrpc_destroy_all_peers(rxnet);
111	rxrpc_destroy_all_locals(rxnet);
112	proc_remove(rxnet->proc_net);
113}
114
115struct pernet_operations rxrpc_net_ops = {
116	.init	= rxrpc_init_net,
117	.exit	= rxrpc_exit_net,
118	.id	= &rxrpc_net_id,
119	.size	= sizeof(struct rxrpc_net),
120};