LXR linux/net/rxrpc/net

   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_client_conn_reap_timeout(struct timer_list *timer)
  14{
  15        struct rxrpc_net *rxnet =
  16                container_of(timer, struct rxrpc_net, client_conn_reap_timer);
  17
  18        if (rxnet->live)
  19                rxrpc_queue_work(&rxnet->client_conn_reaper);
  20}
  21
  22static void rxrpc_service_conn_reap_timeout(struct timer_list *timer)
  23{
  24        struct rxrpc_net *rxnet =
  25                container_of(timer, struct rxrpc_net, service_conn_reap_timer);
  26
  27        if (rxnet->live)
  28                rxrpc_queue_work(&rxnet->service_conn_reaper);
  29}
  30
  31static void rxrpc_peer_keepalive_timeout(struct timer_list *timer)
  32{
  33        struct rxrpc_net *rxnet =
  34                container_of(timer, struct rxrpc_net, peer_keepalive_timer);
  35
  36        if (rxnet->live)
  37                rxrpc_queue_work(&rxnet->peer_keepalive_work);
  38}
  39
  40/*
  41 * Initialise a per-network namespace record.
  42 */
  43static __net_init int rxrpc_init_net(struct net *net)
  44{
  45        struct rxrpc_net *rxnet = rxrpc_net(net);
  46        int ret, i;
  47
  48        rxnet->live = true;
  49        get_random_bytes(&rxnet->epoch, sizeof(rxnet->epoch));
  50        rxnet->epoch |= RXRPC_RANDOM_EPOCH;
  51
  52        INIT_LIST_HEAD(&rxnet->calls);
  53        rwlock_init(&rxnet->call_lock);
  54        atomic_set(&rxnet->nr_calls, 1);
  55
  56        atomic_set(&rxnet->nr_conns, 1);
  57        INIT_LIST_HEAD(&rxnet->conn_proc_list);
  58        INIT_LIST_HEAD(&rxnet->service_conns);
  59        rwlock_init(&rxnet->conn_lock);
  60        INIT_WORK(&rxnet->service_conn_reaper,
  61                  rxrpc_service_connection_reaper);
  62        timer_setup(&rxnet->service_conn_reap_timer,
  63                    rxrpc_service_conn_reap_timeout, 0);
  64
  65        atomic_set(&rxnet->nr_client_conns, 0);
  66        rxnet->kill_all_client_conns = false;
  67        spin_lock_init(&rxnet->client_conn_cache_lock);
  68        spin_lock_init(&rxnet->client_conn_discard_lock);
  69        INIT_LIST_HEAD(&rxnet->idle_client_conns);
  70        INIT_WORK(&rxnet->client_conn_reaper,
  71                  rxrpc_discard_expired_client_conns);
  72        timer_setup(&rxnet->client_conn_reap_timer,
  73                    rxrpc_client_conn_reap_timeout, 0);
  74
  75        INIT_LIST_HEAD(&rxnet->local_endpoints);
  76        mutex_init(&rxnet->local_mutex);
  77
  78        hash_init(rxnet->peer_hash);
  79        spin_lock_init(&rxnet->peer_hash_lock);
  80        for (i = 0; i < ARRAY_SIZE(rxnet->peer_keepalive); i++)
  81                INIT_LIST_HEAD(&rxnet->peer_keepalive[i]);
  82        INIT_LIST_HEAD(&rxnet->peer_keepalive_new);
  83        timer_setup(&rxnet->peer_keepalive_timer,
  84                    rxrpc_peer_keepalive_timeout, 0);
  85        INIT_WORK(&rxnet->peer_keepalive_work, rxrpc_peer_keepalive_worker);
  86        rxnet->peer_keepalive_base = ktime_get_seconds();
  87
  88        ret = -ENOMEM;
  89        rxnet->proc_net = proc_net_mkdir(net, "rxrpc", net->proc_net);
  90        if (!rxnet->proc_net)
  91                goto err_proc;
  92
  93        proc_create_net("calls", 0444, rxnet->proc_net, &rxrpc_call_seq_ops,
  94                        sizeof(struct seq_net_private));
  95        proc_create_net("conns", 0444, rxnet->proc_net,
  96                        &rxrpc_connection_seq_ops,
  97                        sizeof(struct seq_net_private));
  98        proc_create_net("peers", 0444, rxnet->proc_net,
  99                        &rxrpc_peer_seq_ops,
 100                        sizeof(struct seq_net_private));
 101        return 0;
 102
 103err_proc:
 104        rxnet->live = false;
 105        return ret;
 106}
 107
 108/*
 109 * Clean up a per-network namespace record.
 110 */
 111static __net_exit void rxrpc_exit_net(struct net *net)
 112{
 113        struct rxrpc_net *rxnet = rxrpc_net(net);
 114
 115        rxnet->live = false;
 116        del_timer_sync(&rxnet->peer_keepalive_timer);
 117        cancel_work_sync(&rxnet->peer_keepalive_work);
 118        rxrpc_destroy_all_calls(rxnet);
 119        rxrpc_destroy_all_connections(rxnet);
 120        rxrpc_destroy_all_peers(rxnet);
 121        rxrpc_destroy_all_locals(rxnet);
 122        proc_remove(rxnet->proc_net);
 123}
 124
 125struct pernet_operations rxrpc_net_ops = {
 126        .init   = rxrpc_init_net,
 127        .exit   = rxrpc_exit_net,
 128        .id     = &rxrpc_net_id,
 129        .size   = sizeof(struct rxrpc_net),
 130};
 131