net/rxrpc/net_ns.c

   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
  11 unsigned int rxrpc_net_id;
  12
  13 static 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
  22 static 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  */
  34 static __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
  91 err_proc:
  92         rxnet->live = false;
  93         return ret;
  94 }
  95
  96 /*
  97  * Clean up a per-network namespace record.
  98  */
  99 static __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
 115 struct 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 };