1/* rxrpc network namespace handling.
  2 *
  3 * Copyright (C) 2017 Red Hat, Inc. All Rights Reserved.
  4 * Written by David Howells (dhowells@redhat.com)
  5 *
  6 * This program is free software; you can redistribute it and/or
  7 * modify it under the terms of the GNU General Public Licence
  8 * as published by the Free Software Foundation; either version
  9 * 2 of the Licence, or (at your option) any later version.
 10 */
 11
 12#include <linux/proc_fs.h>
 13#include "ar-internal.h"
 14
 15unsigned int rxrpc_net_id;
 16
 17static void rxrpc_client_conn_reap_timeout(struct timer_list *timer)
 18{
 19	struct rxrpc_net *rxnet =
 20		container_of(timer, struct rxrpc_net, client_conn_reap_timer);
 21
 22	if (rxnet->live)
 23		rxrpc_queue_work(&rxnet->client_conn_reaper);
 24}
 25
 26static void rxrpc_service_conn_reap_timeout(struct timer_list *timer)
 27{
 28	struct rxrpc_net *rxnet =
 29		container_of(timer, struct rxrpc_net, service_conn_reap_timer);
 30
 31	if (rxnet->live)
 32		rxrpc_queue_work(&rxnet->service_conn_reaper);
 33}
 34
 35static void rxrpc_peer_keepalive_timeout(struct timer_list *timer)
 36{
 37	struct rxrpc_net *rxnet =
 38		container_of(timer, struct rxrpc_net, peer_keepalive_timer);
 39
 40	if (rxnet->live)
 41		rxrpc_queue_work(&rxnet->peer_keepalive_work);
 42}
 43
 44/*
 45 * Initialise a per-network namespace record.
 46 */
 47static __net_init int rxrpc_init_net(struct net *net)
 48{
 49	struct rxrpc_net *rxnet = rxrpc_net(net);
 50	int ret, i;
 51
 52	rxnet->live = true;
 53	get_random_bytes(&rxnet->epoch, sizeof(rxnet->epoch));
 54	rxnet->epoch |= RXRPC_RANDOM_EPOCH;
 55
 56	INIT_LIST_HEAD(&rxnet->calls);
 57	rwlock_init(&rxnet->call_lock);
 58	atomic_set(&rxnet->nr_calls, 1);
 59
 60	atomic_set(&rxnet->nr_conns, 1);
 61	INIT_LIST_HEAD(&rxnet->conn_proc_list);
 62	INIT_LIST_HEAD(&rxnet->service_conns);
 63	rwlock_init(&rxnet->conn_lock);
 64	INIT_WORK(&rxnet->service_conn_reaper,
 65		  rxrpc_service_connection_reaper);
 66	timer_setup(&rxnet->service_conn_reap_timer,
 67		    rxrpc_service_conn_reap_timeout, 0);
 68
 69	rxnet->nr_client_conns = 0;
 70	rxnet->nr_active_client_conns = 0;
 71	rxnet->kill_all_client_conns = false;
 72	spin_lock_init(&rxnet->client_conn_cache_lock);
 73	spin_lock_init(&rxnet->client_conn_discard_lock);
 74	INIT_LIST_HEAD(&rxnet->waiting_client_conns);
 75	INIT_LIST_HEAD(&rxnet->active_client_conns);
 76	INIT_LIST_HEAD(&rxnet->idle_client_conns);
 77	INIT_WORK(&rxnet->client_conn_reaper,
 78		  rxrpc_discard_expired_client_conns);
 79	timer_setup(&rxnet->client_conn_reap_timer,
 80		    rxrpc_client_conn_reap_timeout, 0);
 81
 82	INIT_LIST_HEAD(&rxnet->local_endpoints);
 83	mutex_init(&rxnet->local_mutex);
 84
 85	hash_init(rxnet->peer_hash);
 86	spin_lock_init(&rxnet->peer_hash_lock);
 87	for (i = 0; i < ARRAY_SIZE(rxnet->peer_keepalive); i++)
 88		INIT_HLIST_HEAD(&rxnet->peer_keepalive[i]);
 89	INIT_HLIST_HEAD(&rxnet->peer_keepalive_new);
 90	timer_setup(&rxnet->peer_keepalive_timer,
 91		    rxrpc_peer_keepalive_timeout, 0);
 92	INIT_WORK(&rxnet->peer_keepalive_work, rxrpc_peer_keepalive_worker);
 93	rxnet->peer_keepalive_base = ktime_add(ktime_get_real(), NSEC_PER_SEC);
 94
 95	ret = -ENOMEM;
 96	rxnet->proc_net = proc_net_mkdir(net, "rxrpc", net->proc_net);
 97	if (!rxnet->proc_net)
 98		goto err_proc;
 99
100	proc_create("calls", 0444, rxnet->proc_net, &rxrpc_call_seq_fops);
101	proc_create("conns", 0444, rxnet->proc_net, &rxrpc_connection_seq_fops);
102	return 0;
103
104err_proc:
105	rxnet->live = false;
106	return ret;
107}
108
109/*
110 * Clean up a per-network namespace record.
111 */
112static __net_exit void rxrpc_exit_net(struct net *net)
113{
114	struct rxrpc_net *rxnet = rxrpc_net(net);
115
116	rxnet->live = false;
117	del_timer_sync(&rxnet->peer_keepalive_timer);
118	cancel_work_sync(&rxnet->peer_keepalive_work);
119	rxrpc_destroy_all_calls(rxnet);
120	rxrpc_destroy_all_connections(rxnet);
121	rxrpc_destroy_all_peers(rxnet);
122	rxrpc_destroy_all_locals(rxnet);
123	proc_remove(rxnet->proc_net);
124}
125
126struct pernet_operations rxrpc_net_ops = {
127	.init	= rxrpc_init_net,
128	.exit	= rxrpc_exit_net,
129	.id	= &rxrpc_net_id,
130	.size	= sizeof(struct rxrpc_net),
131};