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 | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 25 | static void rxrpc_destroy_connection(struct rcu_head *); |
| 26 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 27 | /* |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 28 | * allocate a new connection |
| 29 | */ |
David Howells | c6d2b8d | 2016-04-04 14:00:40 +0100 | [diff] [blame] | 30 | struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 31 | { |
| 32 | struct rxrpc_connection *conn; |
| 33 | |
| 34 | _enter(""); |
| 35 | |
| 36 | conn = kzalloc(sizeof(struct rxrpc_connection), gfp); |
| 37 | if (conn) { |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 38 | INIT_LIST_HEAD(&conn->cache_link); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 39 | spin_lock_init(&conn->channel_lock); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 40 | INIT_LIST_HEAD(&conn->waiting_calls); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 41 | INIT_WORK(&conn->processor, &rxrpc_process_connection); |
David Howells | 4d028b2 | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 42 | INIT_LIST_HEAD(&conn->proc_link); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 43 | INIT_LIST_HEAD(&conn->link); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 44 | skb_queue_head_init(&conn->rx_queue); |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 45 | conn->security = &rxrpc_no_security; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 46 | spin_lock_init(&conn->state_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 47 | conn->debug_id = atomic_inc_return(&rxrpc_debug_id); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 48 | conn->size_align = 4; |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 49 | conn->idle_timestamp = jiffies; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 50 | } |
| 51 | |
Adrian Bunk | 16c61ad | 2007-06-15 15:15:43 -0700 | [diff] [blame] | 52 | _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 53 | return conn; |
| 54 | } |
| 55 | |
| 56 | /* |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 57 | * Look up a connection in the cache by protocol parameters. |
| 58 | * |
| 59 | * If successful, a pointer to the connection is returned, but no ref is taken. |
| 60 | * NULL is returned if there is no match. |
| 61 | * |
| 62 | * The caller must be holding the RCU read lock. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 63 | */ |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 64 | struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *local, |
| 65 | struct sk_buff *skb) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 66 | { |
| 67 | struct rxrpc_connection *conn; |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 68 | struct rxrpc_conn_proto k; |
David Howells | 42886ff | 2016-06-16 13:31:07 +0100 | [diff] [blame] | 69 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 70 | struct sockaddr_rxrpc srx; |
| 71 | struct rxrpc_peer *peer; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 72 | |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 73 | _enter(",%x", sp->hdr.cid & RXRPC_CIDMASK); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 74 | |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 75 | if (rxrpc_extract_addr_from_skb(&srx, skb) < 0) |
| 76 | goto not_found; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 77 | |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 78 | k.epoch = sp->hdr.epoch; |
| 79 | k.cid = sp->hdr.cid & RXRPC_CIDMASK; |
| 80 | |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 81 | /* We may have to handle mixing IPv4 and IPv6 */ |
| 82 | if (srx.transport.family != local->srx.transport.family) { |
| 83 | pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n", |
| 84 | srx.transport.family, |
| 85 | local->srx.transport.family); |
| 86 | goto not_found; |
| 87 | } |
| 88 | |
| 89 | k.epoch = sp->hdr.epoch; |
| 90 | k.cid = sp->hdr.cid & RXRPC_CIDMASK; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 91 | |
David Howells | 4a3388c | 2016-04-04 14:00:37 +0100 | [diff] [blame] | 92 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) { |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 93 | /* We need to look up service connections by the full protocol |
| 94 | * parameter set. We look up the peer first as an intermediate |
| 95 | * step and then the connection from the peer's tree. |
| 96 | */ |
| 97 | peer = rxrpc_lookup_peer_rcu(local, &srx); |
| 98 | if (!peer) |
| 99 | goto not_found; |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 100 | conn = rxrpc_find_service_conn_rcu(peer, skb); |
| 101 | if (!conn || atomic_read(&conn->usage) == 0) |
| 102 | goto not_found; |
| 103 | _leave(" = %p", conn); |
| 104 | return conn; |
David Howells | 4a3388c | 2016-04-04 14:00:37 +0100 | [diff] [blame] | 105 | } else { |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 106 | /* Look up client connections by connection ID alone as their |
| 107 | * IDs are unique for this machine. |
| 108 | */ |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 109 | conn = idr_find(&rxrpc_client_conn_ids, |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 110 | sp->hdr.cid >> RXRPC_CIDSHIFT); |
| 111 | if (!conn || atomic_read(&conn->usage) == 0) { |
| 112 | _debug("no conn"); |
| 113 | goto not_found; |
| 114 | } |
| 115 | |
| 116 | if (conn->proto.epoch != k.epoch || |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 117 | conn->params.local != local) |
| 118 | goto not_found; |
| 119 | |
| 120 | peer = conn->params.peer; |
| 121 | switch (srx.transport.family) { |
| 122 | case AF_INET: |
| 123 | if (peer->srx.transport.sin.sin_port != |
| 124 | srx.transport.sin.sin_port || |
| 125 | peer->srx.transport.sin.sin_addr.s_addr != |
| 126 | srx.transport.sin.sin_addr.s_addr) |
| 127 | goto not_found; |
| 128 | break; |
David Howells | d191274 | 2016-09-17 07:26:01 +0100 | [diff] [blame] | 129 | #ifdef CONFIG_AF_RXRPC_IPV6 |
David Howells | 75b54cb | 2016-09-13 08:49:05 +0100 | [diff] [blame] | 130 | case AF_INET6: |
| 131 | if (peer->srx.transport.sin6.sin6_port != |
| 132 | srx.transport.sin6.sin6_port || |
| 133 | memcmp(&peer->srx.transport.sin6.sin6_addr, |
| 134 | &srx.transport.sin6.sin6_addr, |
| 135 | sizeof(struct in6_addr)) != 0) |
| 136 | goto not_found; |
| 137 | break; |
David Howells | d191274 | 2016-09-17 07:26:01 +0100 | [diff] [blame] | 138 | #endif |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 139 | default: |
| 140 | BUG(); |
| 141 | } |
| 142 | |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 143 | _leave(" = %p", conn); |
| 144 | return conn; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 145 | } |
| 146 | |
David Howells | 1291e9d1 | 2016-06-30 12:02:53 +0100 | [diff] [blame] | 147 | not_found: |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 148 | _leave(" = NULL"); |
| 149 | return NULL; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | /* |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 153 | * Disconnect a call and clear any channel it occupies when that call |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 154 | * terminates. The caller must hold the channel_lock and must release the |
| 155 | * call's ref on the connection. |
| 156 | */ |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 157 | void __rxrpc_disconnect_call(struct rxrpc_connection *conn, |
| 158 | struct rxrpc_call *call) |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 159 | { |
David Howells | 01a90a4 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 160 | struct rxrpc_channel *chan = |
| 161 | &conn->channels[call->cid & RXRPC_CHANNELMASK]; |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 162 | |
David Howells | 01a90a4 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 163 | _enter("%d,%x", conn->debug_id, call->cid); |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 164 | |
| 165 | if (rcu_access_pointer(chan->call) == call) { |
| 166 | /* Save the result of the call so that we can repeat it if necessary |
| 167 | * through the channel, whilst disposing of the actual call record. |
| 168 | */ |
David Howells | b1d9f7fd | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 169 | trace_rxrpc_disconnect_call(call); |
David Howells | f5c17aa | 2016-08-30 09:49:28 +0100 | [diff] [blame] | 170 | if (call->abort_code) { |
| 171 | chan->last_abort = call->abort_code; |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 172 | chan->last_type = RXRPC_PACKET_TYPE_ABORT; |
| 173 | } else { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 174 | chan->last_seq = call->rx_hard_ack; |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 175 | chan->last_type = RXRPC_PACKET_TYPE_ACK; |
| 176 | } |
| 177 | /* Sync with rxrpc_conn_retransmit(). */ |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 178 | smp_wmb(); |
| 179 | chan->last_call = chan->call_id; |
| 180 | chan->call_id = chan->call_counter; |
| 181 | |
| 182 | rcu_assign_pointer(chan->call, NULL); |
David Howells | a1399f8 | 2016-06-27 14:39:44 +0100 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | _leave(""); |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Disconnect a call and clear any channel it occupies when that call |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 190 | * terminates. |
| 191 | */ |
| 192 | void rxrpc_disconnect_call(struct rxrpc_call *call) |
| 193 | { |
| 194 | struct rxrpc_connection *conn = call->conn; |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 195 | |
David Howells | f7aec12 | 2017-06-14 17:56:50 +0100 | [diff] [blame] | 196 | call->peer->cong_cwnd = call->cong_cwnd; |
| 197 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 198 | spin_lock_bh(&conn->params.peer->lock); |
| 199 | hlist_del_init(&call->error_link); |
| 200 | spin_unlock_bh(&conn->params.peer->lock); |
| 201 | |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 202 | if (rxrpc_is_client_call(call)) |
| 203 | return rxrpc_disconnect_client_call(call); |
| 204 | |
David Howells | e653cfe | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 205 | spin_lock(&conn->channel_lock); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 206 | __rxrpc_disconnect_call(conn, call); |
David Howells | e653cfe | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 207 | spin_unlock(&conn->channel_lock); |
| 208 | |
| 209 | call->conn = NULL; |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 210 | conn->idle_timestamp = jiffies; |
David Howells | e653cfe | 2016-04-04 14:00:38 +0100 | [diff] [blame] | 211 | rxrpc_put_connection(conn); |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | /* |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 215 | * Kill off a connection. |
| 216 | */ |
| 217 | void rxrpc_kill_connection(struct rxrpc_connection *conn) |
| 218 | { |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 219 | struct rxrpc_net *rxnet = conn->params.local->rxnet; |
| 220 | |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 221 | ASSERT(!rcu_access_pointer(conn->channels[0].call) && |
| 222 | !rcu_access_pointer(conn->channels[1].call) && |
| 223 | !rcu_access_pointer(conn->channels[2].call) && |
| 224 | !rcu_access_pointer(conn->channels[3].call)); |
| 225 | ASSERT(list_empty(&conn->cache_link)); |
| 226 | |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 227 | write_lock(&rxnet->conn_lock); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 228 | list_del_init(&conn->proc_link); |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 229 | write_unlock(&rxnet->conn_lock); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 230 | |
| 231 | /* Drain the Rx queue. Note that even though we've unpublished, an |
| 232 | * incoming packet could still be being added to our Rx queue, so we |
| 233 | * will need to drain it again in the RCU cleanup handler. |
| 234 | */ |
| 235 | rxrpc_purge_queue(&conn->rx_queue); |
| 236 | |
| 237 | /* Leave final destruction to RCU. The connection processor work item |
| 238 | * must carry a ref on the connection to prevent us getting here whilst |
| 239 | * it is queued or running. |
| 240 | */ |
| 241 | call_rcu(&conn->rcu, rxrpc_destroy_connection); |
| 242 | } |
| 243 | |
| 244 | /* |
David Howells | 363deea | 2016-09-17 10:49:14 +0100 | [diff] [blame] | 245 | * Queue a connection's work processor, getting a ref to pass to the work |
| 246 | * queue. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 247 | */ |
David Howells | 363deea | 2016-09-17 10:49:14 +0100 | [diff] [blame] | 248 | bool rxrpc_queue_conn(struct rxrpc_connection *conn) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 249 | { |
David Howells | 363deea | 2016-09-17 10:49:14 +0100 | [diff] [blame] | 250 | const void *here = __builtin_return_address(0); |
| 251 | int n = __atomic_add_unless(&conn->usage, 1, 0); |
| 252 | if (n == 0) |
| 253 | return false; |
| 254 | if (rxrpc_queue_work(&conn->processor)) |
| 255 | trace_rxrpc_conn(conn, rxrpc_conn_queued, n + 1, here); |
| 256 | else |
| 257 | rxrpc_put_connection(conn); |
| 258 | return true; |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * Note the re-emergence of a connection. |
| 263 | */ |
| 264 | void rxrpc_see_connection(struct rxrpc_connection *conn) |
| 265 | { |
| 266 | const void *here = __builtin_return_address(0); |
| 267 | if (conn) { |
| 268 | int n = atomic_read(&conn->usage); |
| 269 | |
| 270 | trace_rxrpc_conn(conn, rxrpc_conn_seen, n, here); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * Get a ref on a connection. |
| 276 | */ |
| 277 | void rxrpc_get_connection(struct rxrpc_connection *conn) |
| 278 | { |
| 279 | const void *here = __builtin_return_address(0); |
| 280 | int n = atomic_inc_return(&conn->usage); |
| 281 | |
| 282 | trace_rxrpc_conn(conn, rxrpc_conn_got, n, here); |
| 283 | } |
| 284 | |
| 285 | /* |
| 286 | * Try to get a ref on a connection. |
| 287 | */ |
| 288 | struct rxrpc_connection * |
| 289 | rxrpc_get_connection_maybe(struct rxrpc_connection *conn) |
| 290 | { |
| 291 | const void *here = __builtin_return_address(0); |
| 292 | |
| 293 | if (conn) { |
| 294 | int n = __atomic_add_unless(&conn->usage, 1, 0); |
| 295 | if (n > 0) |
| 296 | trace_rxrpc_conn(conn, rxrpc_conn_got, n + 1, here); |
| 297 | else |
| 298 | conn = NULL; |
| 299 | } |
| 300 | return conn; |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * Release a service connection |
| 305 | */ |
| 306 | void rxrpc_put_service_conn(struct rxrpc_connection *conn) |
| 307 | { |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 308 | struct rxrpc_net *rxnet; |
David Howells | 363deea | 2016-09-17 10:49:14 +0100 | [diff] [blame] | 309 | const void *here = __builtin_return_address(0); |
| 310 | int n; |
| 311 | |
| 312 | n = atomic_dec_return(&conn->usage); |
| 313 | trace_rxrpc_conn(conn, rxrpc_conn_put_service, n, here); |
| 314 | ASSERTCMP(n, >=, 0); |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 315 | if (n == 0) { |
| 316 | rxnet = conn->params.local->rxnet; |
| 317 | rxrpc_queue_delayed_work(&rxnet->service_conn_reaper, 0); |
| 318 | } |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | /* |
| 322 | * destroy a virtual connection |
| 323 | */ |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 324 | static void rxrpc_destroy_connection(struct rcu_head *rcu) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 325 | { |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 326 | struct rxrpc_connection *conn = |
| 327 | container_of(rcu, struct rxrpc_connection, rcu); |
| 328 | |
| 329 | _enter("{%d,u=%d}", conn->debug_id, atomic_read(&conn->usage)); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 330 | |
| 331 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); |
| 332 | |
| 333 | _net("DESTROY CONN %d", conn->debug_id); |
| 334 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 335 | rxrpc_purge_queue(&conn->rx_queue); |
| 336 | |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 337 | conn->security->clear(conn); |
David Howells | 19ffa01 | 2016-04-04 14:00:36 +0100 | [diff] [blame] | 338 | key_put(conn->params.key); |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 339 | key_put(conn->server_key); |
David Howells | aa390bb | 2016-06-17 10:06:56 +0100 | [diff] [blame] | 340 | rxrpc_put_peer(conn->params.peer); |
| 341 | rxrpc_put_local(conn->params.local); |
David Howells | e0e4d82 | 2016-04-07 17:23:58 +0100 | [diff] [blame] | 342 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 343 | kfree(conn); |
| 344 | _leave(""); |
| 345 | } |
| 346 | |
| 347 | /* |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 348 | * reap dead service connections |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 349 | */ |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 350 | void rxrpc_service_connection_reaper(struct work_struct *work) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 351 | { |
| 352 | struct rxrpc_connection *conn, *_p; |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 353 | struct rxrpc_net *rxnet = |
| 354 | container_of(to_delayed_work(work), |
| 355 | struct rxrpc_net, service_conn_reaper); |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 356 | unsigned long reap_older_than, earliest, idle_timestamp, now; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 357 | |
| 358 | LIST_HEAD(graveyard); |
| 359 | |
| 360 | _enter(""); |
| 361 | |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 362 | now = jiffies; |
| 363 | reap_older_than = now - rxrpc_connection_expiry * HZ; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 364 | earliest = ULONG_MAX; |
| 365 | |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 366 | write_lock(&rxnet->conn_lock); |
| 367 | list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) { |
David Howells | 001c112 | 2016-06-30 10:45:22 +0100 | [diff] [blame] | 368 | ASSERTCMP(atomic_read(&conn->usage), >, 0); |
| 369 | if (likely(atomic_read(&conn->usage) > 1)) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 370 | continue; |
David Howells | 00e9071 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 371 | if (conn->state == RXRPC_CONN_SERVICE_PREALLOC) |
| 372 | continue; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 373 | |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 374 | idle_timestamp = READ_ONCE(conn->idle_timestamp); |
| 375 | _debug("reap CONN %d { u=%d,t=%ld }", |
| 376 | conn->debug_id, atomic_read(&conn->usage), |
| 377 | (long)reap_older_than - (long)idle_timestamp); |
| 378 | |
| 379 | if (time_after(idle_timestamp, reap_older_than)) { |
| 380 | if (time_before(idle_timestamp, earliest)) |
| 381 | earliest = idle_timestamp; |
David Howells | 001c112 | 2016-06-30 10:45:22 +0100 | [diff] [blame] | 382 | continue; |
David Howells | 999b69f | 2016-06-17 15:42:35 +0100 | [diff] [blame] | 383 | } |
David Howells | 001c112 | 2016-06-30 10:45:22 +0100 | [diff] [blame] | 384 | |
| 385 | /* The usage count sits at 1 whilst the object is unused on the |
| 386 | * list; we reduce that to 0 to make the object unavailable. |
| 387 | */ |
| 388 | if (atomic_cmpxchg(&conn->usage, 1, 0) != 1) |
| 389 | continue; |
| 390 | |
| 391 | if (rxrpc_conn_is_client(conn)) |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 392 | BUG(); |
David Howells | 001c112 | 2016-06-30 10:45:22 +0100 | [diff] [blame] | 393 | else |
| 394 | rxrpc_unpublish_service_conn(conn); |
| 395 | |
| 396 | list_move_tail(&conn->link, &graveyard); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 397 | } |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 398 | write_unlock(&rxnet->conn_lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 399 | |
| 400 | if (earliest != ULONG_MAX) { |
| 401 | _debug("reschedule reaper %ld", (long) earliest - now); |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 402 | ASSERT(time_after(earliest, now)); |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 403 | rxrpc_queue_delayed_work(&rxnet->client_conn_reaper, |
David Howells | f51b448 | 2016-08-23 15:27:24 +0100 | [diff] [blame] | 404 | earliest - now); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 405 | } |
| 406 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 407 | while (!list_empty(&graveyard)) { |
| 408 | conn = list_entry(graveyard.next, struct rxrpc_connection, |
| 409 | link); |
| 410 | list_del_init(&conn->link); |
| 411 | |
| 412 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 413 | rxrpc_kill_connection(conn); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | _leave(""); |
| 417 | } |
| 418 | |
| 419 | /* |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 420 | * preemptively destroy all the service connection records rather than |
| 421 | * waiting for them to time out |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 422 | */ |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 423 | void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 424 | { |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 425 | struct rxrpc_connection *conn, *_p; |
| 426 | bool leak = false; |
| 427 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 428 | _enter(""); |
| 429 | |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 430 | rxrpc_destroy_all_client_connections(rxnet); |
David Howells | 45025bc | 2016-08-24 07:30:52 +0100 | [diff] [blame] | 431 | |
David Howells | 5873c08 | 2014-02-07 18:58:44 +0000 | [diff] [blame] | 432 | rxrpc_connection_expiry = 0; |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 433 | cancel_delayed_work(&rxnet->client_conn_reaper); |
| 434 | rxrpc_queue_delayed_work(&rxnet->client_conn_reaper, 0); |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 435 | flush_workqueue(rxrpc_workqueue); |
| 436 | |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 437 | write_lock(&rxnet->conn_lock); |
| 438 | list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) { |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 439 | pr_err("AF_RXRPC: Leaked conn %p {%d}\n", |
| 440 | conn, atomic_read(&conn->usage)); |
| 441 | leak = true; |
| 442 | } |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 443 | write_unlock(&rxnet->conn_lock); |
David Howells | dee4636 | 2016-06-27 17:11:19 +0100 | [diff] [blame] | 444 | BUG_ON(leak); |
| 445 | |
David Howells | 2baec2c | 2017-05-24 17:02:32 +0100 | [diff] [blame] | 446 | ASSERT(list_empty(&rxnet->conn_proc_list)); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 447 | |
| 448 | _leave(""); |
| 449 | } |