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1bab27af6b
Use the information now stored in struct rxrpc_call to configure the connection bundle and thence the connection, rather than using the rxrpc_conn_parameters struct. Signed-off-by: David Howells <dhowells@redhat.com> cc: Marc Dionne <marc.dionne@auristor.com> cc: linux-afs@lists.infradead.org
496 lines
13 KiB
C
496 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* RxRPC virtual connection handler, common bits.
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*
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* Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include "ar-internal.h"
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/*
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* Time till a connection expires after last use (in seconds).
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*/
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unsigned int __read_mostly rxrpc_connection_expiry = 10 * 60;
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unsigned int __read_mostly rxrpc_closed_conn_expiry = 10;
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static void rxrpc_clean_up_connection(struct work_struct *work);
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static void rxrpc_set_service_reap_timer(struct rxrpc_net *rxnet,
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unsigned long reap_at);
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void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why)
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{
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struct rxrpc_local *local = conn->local;
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bool busy;
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if (WARN_ON_ONCE(!local))
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return;
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spin_lock_bh(&local->lock);
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busy = !list_empty(&conn->attend_link);
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if (!busy) {
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rxrpc_get_connection(conn, why);
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list_add_tail(&conn->attend_link, &local->conn_attend_q);
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}
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spin_unlock_bh(&local->lock);
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rxrpc_wake_up_io_thread(local);
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}
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static void rxrpc_connection_timer(struct timer_list *timer)
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{
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struct rxrpc_connection *conn =
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container_of(timer, struct rxrpc_connection, timer);
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rxrpc_poke_conn(conn, rxrpc_conn_get_poke_timer);
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}
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/*
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* allocate a new connection
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*/
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struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *rxnet,
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gfp_t gfp)
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{
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struct rxrpc_connection *conn;
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_enter("");
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conn = kzalloc(sizeof(struct rxrpc_connection), gfp);
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if (conn) {
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INIT_LIST_HEAD(&conn->cache_link);
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timer_setup(&conn->timer, &rxrpc_connection_timer, 0);
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INIT_WORK(&conn->processor, rxrpc_process_connection);
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INIT_WORK(&conn->destructor, rxrpc_clean_up_connection);
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INIT_LIST_HEAD(&conn->proc_link);
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INIT_LIST_HEAD(&conn->link);
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skb_queue_head_init(&conn->rx_queue);
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conn->rxnet = rxnet;
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conn->security = &rxrpc_no_security;
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spin_lock_init(&conn->state_lock);
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conn->debug_id = atomic_inc_return(&rxrpc_debug_id);
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conn->idle_timestamp = jiffies;
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}
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_leave(" = %p{%d}", conn, conn ? conn->debug_id : 0);
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return conn;
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}
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/*
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* Look up a connection in the cache by protocol parameters.
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*
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* If successful, a pointer to the connection is returned, but no ref is taken.
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* NULL is returned if there is no match.
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*
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* When searching for a service call, if we find a peer but no connection, we
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* return that through *_peer in case we need to create a new service call.
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*
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* The caller must be holding the RCU read lock.
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*/
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struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *local,
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struct sockaddr_rxrpc *srx,
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struct sk_buff *skb)
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{
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struct rxrpc_connection *conn;
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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struct rxrpc_peer *peer;
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_enter(",%x", sp->hdr.cid & RXRPC_CIDMASK);
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/* Look up client connections by connection ID alone as their
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* IDs are unique for this machine.
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*/
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conn = idr_find(&local->conn_ids, sp->hdr.cid >> RXRPC_CIDSHIFT);
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if (!conn || refcount_read(&conn->ref) == 0) {
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_debug("no conn");
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goto not_found;
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}
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if (conn->proto.epoch != sp->hdr.epoch ||
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conn->local != local)
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goto not_found;
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peer = conn->peer;
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switch (srx->transport.family) {
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case AF_INET:
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if (peer->srx.transport.sin.sin_port !=
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srx->transport.sin.sin_port ||
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peer->srx.transport.sin.sin_addr.s_addr !=
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srx->transport.sin.sin_addr.s_addr)
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goto not_found;
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break;
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#ifdef CONFIG_AF_RXRPC_IPV6
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case AF_INET6:
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if (peer->srx.transport.sin6.sin6_port !=
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srx->transport.sin6.sin6_port ||
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memcmp(&peer->srx.transport.sin6.sin6_addr,
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&srx->transport.sin6.sin6_addr,
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sizeof(struct in6_addr)) != 0)
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goto not_found;
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break;
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#endif
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default:
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BUG();
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}
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_leave(" = %p", conn);
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return conn;
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not_found:
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_leave(" = NULL");
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return NULL;
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}
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/*
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* Disconnect a call and clear any channel it occupies when that call
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* terminates. The caller must hold the channel_lock and must release the
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* call's ref on the connection.
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*/
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void __rxrpc_disconnect_call(struct rxrpc_connection *conn,
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struct rxrpc_call *call)
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{
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struct rxrpc_channel *chan =
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&conn->channels[call->cid & RXRPC_CHANNELMASK];
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_enter("%d,%x", conn->debug_id, call->cid);
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if (rcu_access_pointer(chan->call) == call) {
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/* Save the result of the call so that we can repeat it if necessary
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* through the channel, whilst disposing of the actual call record.
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*/
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trace_rxrpc_disconnect_call(call);
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switch (call->completion) {
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case RXRPC_CALL_SUCCEEDED:
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chan->last_seq = call->rx_highest_seq;
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chan->last_type = RXRPC_PACKET_TYPE_ACK;
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break;
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case RXRPC_CALL_LOCALLY_ABORTED:
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chan->last_abort = call->abort_code;
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chan->last_type = RXRPC_PACKET_TYPE_ABORT;
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break;
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default:
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chan->last_abort = RX_CALL_DEAD;
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chan->last_type = RXRPC_PACKET_TYPE_ABORT;
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break;
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}
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/* Sync with rxrpc_conn_retransmit(). */
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smp_wmb();
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chan->last_call = chan->call_id;
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chan->call_id = chan->call_counter;
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rcu_assign_pointer(chan->call, NULL);
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}
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_leave("");
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}
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/*
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* Disconnect a call and clear any channel it occupies when that call
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* terminates.
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*/
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void rxrpc_disconnect_call(struct rxrpc_call *call)
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{
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struct rxrpc_connection *conn = call->conn;
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set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
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rxrpc_see_call(call, rxrpc_call_see_disconnected);
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call->peer->cong_ssthresh = call->cong_ssthresh;
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if (!hlist_unhashed(&call->error_link)) {
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spin_lock(&call->peer->lock);
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hlist_del_init(&call->error_link);
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spin_unlock(&call->peer->lock);
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}
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if (rxrpc_is_client_call(call)) {
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rxrpc_disconnect_client_call(call->bundle, call);
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} else {
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spin_lock(&conn->bundle->channel_lock);
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__rxrpc_disconnect_call(conn, call);
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spin_unlock(&conn->bundle->channel_lock);
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conn->idle_timestamp = jiffies;
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if (atomic_dec_and_test(&conn->active))
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rxrpc_set_service_reap_timer(conn->rxnet,
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jiffies + rxrpc_connection_expiry);
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}
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rxrpc_put_call(call, rxrpc_call_put_io_thread);
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}
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/*
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* Queue a connection's work processor, getting a ref to pass to the work
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* queue.
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*/
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void rxrpc_queue_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why)
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{
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if (atomic_read(&conn->active) >= 0 &&
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rxrpc_queue_work(&conn->processor))
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rxrpc_see_connection(conn, why);
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}
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/*
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* Note the re-emergence of a connection.
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*/
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void rxrpc_see_connection(struct rxrpc_connection *conn,
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enum rxrpc_conn_trace why)
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{
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if (conn) {
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int r = refcount_read(&conn->ref);
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trace_rxrpc_conn(conn->debug_id, r, why);
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}
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}
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/*
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* Get a ref on a connection.
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*/
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struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *conn,
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enum rxrpc_conn_trace why)
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{
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int r;
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__refcount_inc(&conn->ref, &r);
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trace_rxrpc_conn(conn->debug_id, r + 1, why);
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return conn;
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}
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/*
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* Try to get a ref on a connection.
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*/
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struct rxrpc_connection *
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rxrpc_get_connection_maybe(struct rxrpc_connection *conn,
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enum rxrpc_conn_trace why)
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{
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int r;
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if (conn) {
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if (__refcount_inc_not_zero(&conn->ref, &r))
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trace_rxrpc_conn(conn->debug_id, r + 1, why);
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else
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conn = NULL;
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}
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return conn;
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}
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/*
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* Set the service connection reap timer.
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*/
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static void rxrpc_set_service_reap_timer(struct rxrpc_net *rxnet,
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unsigned long reap_at)
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{
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if (rxnet->live)
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timer_reduce(&rxnet->service_conn_reap_timer, reap_at);
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}
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/*
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* destroy a virtual connection
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*/
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static void rxrpc_rcu_free_connection(struct rcu_head *rcu)
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{
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struct rxrpc_connection *conn =
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container_of(rcu, struct rxrpc_connection, rcu);
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struct rxrpc_net *rxnet = conn->rxnet;
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_enter("{%d,u=%d}", conn->debug_id, refcount_read(&conn->ref));
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trace_rxrpc_conn(conn->debug_id, refcount_read(&conn->ref),
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rxrpc_conn_free);
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kfree(conn);
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if (atomic_dec_and_test(&rxnet->nr_conns))
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wake_up_var(&rxnet->nr_conns);
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}
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/*
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* Clean up a dead connection.
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*/
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static void rxrpc_clean_up_connection(struct work_struct *work)
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{
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struct rxrpc_connection *conn =
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container_of(work, struct rxrpc_connection, destructor);
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struct rxrpc_net *rxnet = conn->rxnet;
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ASSERT(!rcu_access_pointer(conn->channels[0].call) &&
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!rcu_access_pointer(conn->channels[1].call) &&
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!rcu_access_pointer(conn->channels[2].call) &&
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!rcu_access_pointer(conn->channels[3].call));
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ASSERT(list_empty(&conn->cache_link));
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del_timer_sync(&conn->timer);
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cancel_work_sync(&conn->processor); /* Processing may restart the timer */
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del_timer_sync(&conn->timer);
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write_lock(&rxnet->conn_lock);
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list_del_init(&conn->proc_link);
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write_unlock(&rxnet->conn_lock);
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rxrpc_purge_queue(&conn->rx_queue);
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rxrpc_kill_client_conn(conn);
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conn->security->clear(conn);
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key_put(conn->key);
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rxrpc_put_bundle(conn->bundle, rxrpc_bundle_put_conn);
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rxrpc_put_peer(conn->peer, rxrpc_peer_put_conn);
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rxrpc_put_local(conn->local, rxrpc_local_put_kill_conn);
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/* Drain the Rx queue. Note that even though we've unpublished, an
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* incoming packet could still be being added to our Rx queue, so we
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* will need to drain it again in the RCU cleanup handler.
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*/
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rxrpc_purge_queue(&conn->rx_queue);
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call_rcu(&conn->rcu, rxrpc_rcu_free_connection);
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}
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/*
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* Drop a ref on a connection.
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*/
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void rxrpc_put_connection(struct rxrpc_connection *conn,
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enum rxrpc_conn_trace why)
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{
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unsigned int debug_id;
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bool dead;
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int r;
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if (!conn)
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return;
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debug_id = conn->debug_id;
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dead = __refcount_dec_and_test(&conn->ref, &r);
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trace_rxrpc_conn(debug_id, r - 1, why);
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if (dead) {
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del_timer(&conn->timer);
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cancel_work(&conn->processor);
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if (in_softirq() || work_busy(&conn->processor) ||
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timer_pending(&conn->timer))
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/* Can't use the rxrpc workqueue as we need to cancel/flush
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* something that may be running/waiting there.
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*/
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schedule_work(&conn->destructor);
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else
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rxrpc_clean_up_connection(&conn->destructor);
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}
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}
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/*
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* reap dead service connections
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*/
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void rxrpc_service_connection_reaper(struct work_struct *work)
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{
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struct rxrpc_connection *conn, *_p;
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struct rxrpc_net *rxnet =
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container_of(work, struct rxrpc_net, service_conn_reaper);
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unsigned long expire_at, earliest, idle_timestamp, now;
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int active;
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LIST_HEAD(graveyard);
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_enter("");
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now = jiffies;
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earliest = now + MAX_JIFFY_OFFSET;
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write_lock(&rxnet->conn_lock);
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list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
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ASSERTCMP(atomic_read(&conn->active), >=, 0);
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if (likely(atomic_read(&conn->active) > 0))
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continue;
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if (conn->state == RXRPC_CONN_SERVICE_PREALLOC)
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continue;
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if (rxnet->live && !conn->local->dead) {
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idle_timestamp = READ_ONCE(conn->idle_timestamp);
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expire_at = idle_timestamp + rxrpc_connection_expiry * HZ;
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if (conn->local->service_closed)
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expire_at = idle_timestamp + rxrpc_closed_conn_expiry * HZ;
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_debug("reap CONN %d { a=%d,t=%ld }",
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conn->debug_id, atomic_read(&conn->active),
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(long)expire_at - (long)now);
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if (time_before(now, expire_at)) {
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if (time_before(expire_at, earliest))
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earliest = expire_at;
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continue;
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}
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}
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/* The activity count sits at 0 whilst the conn is unused on
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* the list; we reduce that to -1 to make the conn unavailable.
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*/
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active = 0;
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if (!atomic_try_cmpxchg(&conn->active, &active, -1))
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continue;
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rxrpc_see_connection(conn, rxrpc_conn_see_reap_service);
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if (rxrpc_conn_is_client(conn))
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BUG();
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else
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rxrpc_unpublish_service_conn(conn);
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list_move_tail(&conn->link, &graveyard);
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}
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write_unlock(&rxnet->conn_lock);
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if (earliest != now + MAX_JIFFY_OFFSET) {
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_debug("reschedule reaper %ld", (long)earliest - (long)now);
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ASSERT(time_after(earliest, now));
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rxrpc_set_service_reap_timer(rxnet, earliest);
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}
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while (!list_empty(&graveyard)) {
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conn = list_entry(graveyard.next, struct rxrpc_connection,
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link);
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list_del_init(&conn->link);
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ASSERTCMP(atomic_read(&conn->active), ==, -1);
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rxrpc_put_connection(conn, rxrpc_conn_put_service_reaped);
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}
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_leave("");
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}
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/*
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* preemptively destroy all the service connection records rather than
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* waiting for them to time out
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*/
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void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet)
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{
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struct rxrpc_connection *conn, *_p;
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bool leak = false;
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_enter("");
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atomic_dec(&rxnet->nr_conns);
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rxrpc_destroy_all_client_connections(rxnet);
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del_timer_sync(&rxnet->service_conn_reap_timer);
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rxrpc_queue_work(&rxnet->service_conn_reaper);
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flush_workqueue(rxrpc_workqueue);
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write_lock(&rxnet->conn_lock);
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list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) {
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pr_err("AF_RXRPC: Leaked conn %p {%d}\n",
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conn, refcount_read(&conn->ref));
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leak = true;
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}
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write_unlock(&rxnet->conn_lock);
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BUG_ON(leak);
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ASSERT(list_empty(&rxnet->conn_proc_list));
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/* We need to wait for the connections to be destroyed by RCU as they
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* pin things that we still need to get rid of.
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*/
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wait_var_event(&rxnet->nr_conns, !atomic_read(&rxnet->nr_conns));
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_leave("");
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}
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