David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 1 | /* RxRPC virtual connection handler, common bits. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 2 | * |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 3 | * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 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 License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
Joe Perches | 9b6d539 | 2016-06-02 12:08:52 -0700 | [diff] [blame] | 12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 13 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 16 | #include <linux/net.h> |
| 17 | #include <linux/skbuff.h> |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 18 | #include "ar-internal.h" |
| 19 | |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 20 | /* |
| 21 | * Time till a connection expires after last use (in seconds). |
| 22 | */ |
David Howells | dad8aff | 2016-03-09 23:22:56 +0000 | [diff] [blame] | 23 | unsigned int rxrpc_connection_expiry = 10 * 60; |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 24 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 25 | static void rxrpc_connection_reaper(struct work_struct *work); |
| 26 | |
| 27 | LIST_HEAD(rxrpc_connections); |
David Howells | 4d028b2 | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 28 | LIST_HEAD(rxrpc_connection_proc_list); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 29 | DEFINE_RWLOCK(rxrpc_connection_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 30 | static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper); |
| 31 | |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 32 | static void rxrpc_destroy_connection(struct rcu_head *); |
| 33 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 34 | /* |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 35 | * allocate a new connection |
| 36 | */ |
David Howells | c6d2b8d | 2016-04-04 14:00:40 +0100 | [diff] [blame] | 37 | struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 38 | { |
| 39 | struct rxrpc_connection *conn; |
| 40 | |
| 41 | _enter(""); |
| 42 | |
| 43 | conn = kzalloc(sizeof(struct rxrpc_connection), gfp); |
| 44 | if (conn) { |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 45 | INIT_LIST_HEAD(&conn->cache_link); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 46 | spin_lock_init(&conn->channel_lock); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 47 | INIT_LIST_HEAD(&conn->waiting_calls); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 48 | INIT_WORK(&conn->processor, &rxrpc_process_connection); |
David Howells | 4d028b2 | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 49 | INIT_LIST_HEAD(&conn->proc_link); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 50 | INIT_LIST_HEAD(&conn->link); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 51 | skb_queue_head_init(&conn->rx_queue); |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 52 | conn->security = &rxrpc_no_security; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 53 | spin_lock_init(&conn->state_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 54 | conn->debug_id = atomic_inc_return(&rxrpc_debug_id); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 55 | conn->size_align = 4; |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 56 | conn->header_size = sizeof(struct rxrpc_wire_header); |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 57 | conn->idle_timestamp = jiffies; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 58 | } |
| 59 | |
Adrian Bunk | 16c61ad | 2007-06-15 15:15:43 -0700 | [diff] [blame] | 60 | _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 61 | return conn; |
| 62 | } |
| 63 | |
| 64 | /* |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 65 | * Look up a connection in the cache by protocol parameters. |
| 66 | * |
| 67 | * If successful, a pointer to the connection is returned, but no ref is taken. |
| 68 | * NULL is returned if there is no match. |
| 69 | * |
| 70 | * The caller must be holding the RCU read lock. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 71 | */ |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 72 | struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *local, |
| 73 | struct sk_buff *skb) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 74 | { |
| 75 | struct rxrpc_connection *conn; |
David Howells | 1291e9d | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 76 | struct rxrpc_conn_proto k; |
David Howells | 42886ff | 2016-06-16 13:31:07 +0100 | [diff] [blame] | 77 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
David Howells | 1291e9d | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 78 | struct sockaddr_rxrpc srx; |
| 79 | struct rxrpc_peer *peer; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 80 | |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 81 | _enter(",%x", sp->hdr.cid & RXRPC_CIDMASK); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 82 | |
David Howells | 1291e9d | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 83 | if (rxrpc_extract_addr_from_skb(&srx, skb) < 0) |
| 84 | goto not_found; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 85 | |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 86 | k.epoch = sp->hdr.epoch; |
| 87 | k.cid = sp->hdr.cid & RXRPC_CIDMASK; |
| 88 | |
David Howells | 1291e9d | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 89 | /* We may have to handle mixing IPv4 and IPv6 */ |
| 90 | if (srx.transport.family != local->srx.transport.family) { |
| 91 | pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n", |
| 92 | srx.transport.family, |
| 93 | local->srx.transport.family); |
| 94 | goto not_found; |
| 95 | } |
| 96 | |
| 97 | k.epoch = sp->hdr.epoch; |
| 98 | k.cid = sp->hdr.cid & RXRPC_CIDMASK; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 99 | |
David Howells | 4a3388c | 2016-04-04 14:00:37 +0100 | [diff] [blame] | 100 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) { |
David Howells | 1291e9d | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 101 | /* We need to look up service connections by the full protocol |
| 102 | * parameter set. We look up the peer first as an intermediate |
| 103 | * step and then the connection from the peer's tree. |
| 104 | */ |
| 105 | peer = rxrpc_lookup_peer_rcu(local, &srx); |
| 106 | if (!peer) |
| 107 | goto not_found; |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 108 | conn = rxrpc_find_service_conn_rcu(peer, skb); |
| 109 | if (!conn || atomic_read(&conn->usage) == 0) |
| 110 | goto not_found; |
| 111 | _leave(" = %p", conn); |
| 112 | return conn; |
David Howells | 4a3388c | 2016-04-04 14:00:37 +0100 | [diff] [blame] | 113 | } else { |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 114 | /* Look up client connections by connection ID alone as their |
| 115 | * IDs are unique for this machine. |
| 116 | */ |
David Howells | 1291e9d | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 117 | conn = idr_find(&rxrpc_client_conn_ids, |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 118 | sp->hdr.cid >> RXRPC_CIDSHIFT); |
| 119 | if (!conn || atomic_read(&conn->usage) == 0) { |
| 120 | _debug("no conn"); |
| 121 | goto not_found; |
| 122 | } |
| 123 | |
| 124 | if (conn->proto.epoch != k.epoch || |
David Howells | 1291e9d | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 125 | conn->params.local != local) |
| 126 | goto not_found; |
| 127 | |
| 128 | peer = conn->params.peer; |
| 129 | switch (srx.transport.family) { |
| 130 | case AF_INET: |
| 131 | if (peer->srx.transport.sin.sin_port != |
| 132 | srx.transport.sin.sin_port || |
| 133 | peer->srx.transport.sin.sin_addr.s_addr != |
| 134 | srx.transport.sin.sin_addr.s_addr) |
| 135 | goto not_found; |
| 136 | break; |
| 137 | default: |
| 138 | BUG(); |
| 139 | } |
| 140 | |
David Howells | 1291e9d | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 141 | _leave(" = %p", conn); |
| 142 | return conn; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 143 | } |
| 144 | |
David Howells | 1291e9d | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 145 | not_found: |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 146 | _leave(" = NULL"); |
| 147 | return NULL; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | /* |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 151 | * Disconnect a call and clear any channel it occupies when that call |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 152 | * terminates. The caller must hold the channel_lock and must release the |
| 153 | * call's ref on the connection. |
| 154 | */ |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 155 | void __rxrpc_disconnect_call(struct rxrpc_connection *conn, |
| 156 | struct rxrpc_call *call) |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 157 | { |
David Howells | 01a90a4 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 158 | struct rxrpc_channel *chan = |
| 159 | &conn->channels[call->cid & RXRPC_CHANNELMASK]; |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 160 | |
David Howells | 01a90a4 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 161 | _enter("%d,%x", conn->debug_id, call->cid); |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 162 | |
| 163 | if (rcu_access_pointer(chan->call) == call) { |
| 164 | /* Save the result of the call so that we can repeat it if necessary |
| 165 | * through the channel, whilst disposing of the actual call record. |
| 166 | */ |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 167 | chan->last_service_id = call->service_id; |
David Howells | f5c17aa | 2016-08-30 09:49:28 +0100 | [diff] [blame] | 168 | if (call->abort_code) { |
| 169 | chan->last_abort = call->abort_code; |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 170 | chan->last_type = RXRPC_PACKET_TYPE_ABORT; |
| 171 | } else { |
| 172 | chan->last_seq = call->rx_data_eaten; |
| 173 | chan->last_type = RXRPC_PACKET_TYPE_ACK; |
| 174 | } |
| 175 | /* Sync with rxrpc_conn_retransmit(). */ |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 176 | smp_wmb(); |
| 177 | chan->last_call = chan->call_id; |
| 178 | chan->call_id = chan->call_counter; |
| 179 | |
| 180 | rcu_assign_pointer(chan->call, NULL); |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | _leave(""); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Disconnect a call and clear any channel it occupies when that call |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 188 | * terminates. |
| 189 | */ |
| 190 | void rxrpc_disconnect_call(struct rxrpc_call *call) |
| 191 | { |
| 192 | struct rxrpc_connection *conn = call->conn; |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 193 | |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 194 | if (rxrpc_is_client_call(call)) |
| 195 | return rxrpc_disconnect_client_call(call); |
| 196 | |
David Howells | e653cfe | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 197 | spin_lock(&conn->channel_lock); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 198 | __rxrpc_disconnect_call(conn, call); |
David Howells | e653cfe | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 199 | spin_unlock(&conn->channel_lock); |
| 200 | |
| 201 | call->conn = NULL; |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 202 | conn->idle_timestamp = jiffies; |
David Howells | e653cfe | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 203 | rxrpc_put_connection(conn); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | /* |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 207 | * Kill off a connection. |
| 208 | */ |
| 209 | void rxrpc_kill_connection(struct rxrpc_connection *conn) |
| 210 | { |
| 211 | ASSERT(!rcu_access_pointer(conn->channels[0].call) && |
| 212 | !rcu_access_pointer(conn->channels[1].call) && |
| 213 | !rcu_access_pointer(conn->channels[2].call) && |
| 214 | !rcu_access_pointer(conn->channels[3].call)); |
| 215 | ASSERT(list_empty(&conn->cache_link)); |
| 216 | |
| 217 | write_lock(&rxrpc_connection_lock); |
| 218 | list_del_init(&conn->proc_link); |
| 219 | write_unlock(&rxrpc_connection_lock); |
| 220 | |
| 221 | /* Drain the Rx queue. Note that even though we've unpublished, an |
| 222 | * incoming packet could still be being added to our Rx queue, so we |
| 223 | * will need to drain it again in the RCU cleanup handler. |
| 224 | */ |
| 225 | rxrpc_purge_queue(&conn->rx_queue); |
| 226 | |
| 227 | /* Leave final destruction to RCU. The connection processor work item |
| 228 | * must carry a ref on the connection to prevent us getting here whilst |
| 229 | * it is queued or running. |
| 230 | */ |
| 231 | call_rcu(&conn->rcu, rxrpc_destroy_connection); |
| 232 | } |
| 233 | |
| 234 | /* |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 235 | * release a virtual connection |
| 236 | */ |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 237 | void __rxrpc_put_connection(struct rxrpc_connection *conn) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 238 | { |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 239 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | /* |
| 243 | * destroy a virtual connection |
| 244 | */ |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 245 | static void rxrpc_destroy_connection(struct rcu_head *rcu) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 246 | { |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 247 | struct rxrpc_connection *conn = |
| 248 | container_of(rcu, struct rxrpc_connection, rcu); |
| 249 | |
| 250 | _enter("{%d,u=%d}", conn->debug_id, atomic_read(&conn->usage)); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 251 | |
| 252 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); |
| 253 | |
| 254 | _net("DESTROY CONN %d", conn->debug_id); |
| 255 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 256 | rxrpc_purge_queue(&conn->rx_queue); |
| 257 | |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 258 | conn->security->clear(conn); |
David Howells | 19ffa01 | 2016-04-04 14:00:36 +0100 | [diff] [blame] | 259 | key_put(conn->params.key); |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 260 | key_put(conn->server_key); |
David Howells | aa390bb | 2016-06-17 10:06:56 +0100 | [diff] [blame] | 261 | rxrpc_put_peer(conn->params.peer); |
| 262 | rxrpc_put_local(conn->params.local); |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 263 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 264 | kfree(conn); |
| 265 | _leave(""); |
| 266 | } |
| 267 | |
| 268 | /* |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 269 | * reap dead service connections |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 270 | */ |
Roel Kluin | 5eaa65b | 2008-12-10 15:18:31 -0800 | [diff] [blame] | 271 | static void rxrpc_connection_reaper(struct work_struct *work) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 272 | { |
| 273 | struct rxrpc_connection *conn, *_p; |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 274 | unsigned long reap_older_than, earliest, idle_timestamp, now; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 275 | |
| 276 | LIST_HEAD(graveyard); |
| 277 | |
| 278 | _enter(""); |
| 279 | |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 280 | now = jiffies; |
| 281 | reap_older_than = now - rxrpc_connection_expiry * HZ; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 282 | earliest = ULONG_MAX; |
| 283 | |
David Howells | b3f5750 | 2016-06-21 16:10:03 +0100 | [diff] [blame] | 284 | write_lock(&rxrpc_connection_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 285 | list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) { |
David Howells | 001c112 | 2016-06-30 10:45:22 +0100 | [diff] [blame] | 286 | ASSERTCMP(atomic_read(&conn->usage), >, 0); |
| 287 | if (likely(atomic_read(&conn->usage) > 1)) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 288 | continue; |
David Howells | 00e9071 | 2016-09-08 11:10:12 +0100 | [diff] [blame^] | 289 | if (conn->state == RXRPC_CONN_SERVICE_PREALLOC) |
| 290 | continue; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 291 | |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 292 | idle_timestamp = READ_ONCE(conn->idle_timestamp); |
| 293 | _debug("reap CONN %d { u=%d,t=%ld }", |
| 294 | conn->debug_id, atomic_read(&conn->usage), |
| 295 | (long)reap_older_than - (long)idle_timestamp); |
| 296 | |
| 297 | if (time_after(idle_timestamp, reap_older_than)) { |
| 298 | if (time_before(idle_timestamp, earliest)) |
| 299 | earliest = idle_timestamp; |
David Howells | 001c112 | 2016-06-30 10:45:22 +0100 | [diff] [blame] | 300 | continue; |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 301 | } |
David Howells | 001c112 | 2016-06-30 10:45:22 +0100 | [diff] [blame] | 302 | |
| 303 | /* The usage count sits at 1 whilst the object is unused on the |
| 304 | * list; we reduce that to 0 to make the object unavailable. |
| 305 | */ |
| 306 | if (atomic_cmpxchg(&conn->usage, 1, 0) != 1) |
| 307 | continue; |
| 308 | |
| 309 | if (rxrpc_conn_is_client(conn)) |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 310 | BUG(); |
David Howells | 001c112 | 2016-06-30 10:45:22 +0100 | [diff] [blame] | 311 | else |
| 312 | rxrpc_unpublish_service_conn(conn); |
| 313 | |
| 314 | list_move_tail(&conn->link, &graveyard); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 315 | } |
David Howells | b3f5750 | 2016-06-21 16:10:03 +0100 | [diff] [blame] | 316 | write_unlock(&rxrpc_connection_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 317 | |
| 318 | if (earliest != ULONG_MAX) { |
| 319 | _debug("reschedule reaper %ld", (long) earliest - now); |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 320 | ASSERT(time_after(earliest, now)); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 321 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 322 | earliest - now); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 323 | } |
| 324 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 325 | while (!list_empty(&graveyard)) { |
| 326 | conn = list_entry(graveyard.next, struct rxrpc_connection, |
| 327 | link); |
| 328 | list_del_init(&conn->link); |
| 329 | |
| 330 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 331 | rxrpc_kill_connection(conn); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | _leave(""); |
| 335 | } |
| 336 | |
| 337 | /* |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 338 | * preemptively destroy all the service connection records rather than |
| 339 | * waiting for them to time out |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 340 | */ |
| 341 | void __exit rxrpc_destroy_all_connections(void) |
| 342 | { |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 343 | struct rxrpc_connection *conn, *_p; |
| 344 | bool leak = false; |
| 345 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 346 | _enter(""); |
| 347 | |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 348 | rxrpc_destroy_all_client_connections(); |
| 349 | |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 350 | rxrpc_connection_expiry = 0; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 351 | cancel_delayed_work(&rxrpc_connection_reap); |
David Howells | 651350d | 2007-04-26 15:50:17 -0700 | [diff] [blame] | 352 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 353 | flush_workqueue(rxrpc_workqueue); |
| 354 | |
| 355 | write_lock(&rxrpc_connection_lock); |
| 356 | list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) { |
| 357 | pr_err("AF_RXRPC: Leaked conn %p {%d}\n", |
| 358 | conn, atomic_read(&conn->usage)); |
| 359 | leak = true; |
| 360 | } |
| 361 | write_unlock(&rxrpc_connection_lock); |
| 362 | BUG_ON(leak); |
| 363 | |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 364 | ASSERT(list_empty(&rxrpc_connection_proc_list)); |
| 365 | |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 366 | /* Make sure the local and peer records pinned by any dying connections |
| 367 | * are released. |
| 368 | */ |
| 369 | rcu_barrier(); |
| 370 | rxrpc_destroy_client_conn_ids(); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 371 | |
| 372 | _leave(""); |
| 373 | } |