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-rw-r--r--net/rxrpc/call_object.c804
1 files changed, 804 insertions, 0 deletions
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
new file mode 100644
index 000000000000..91287c9d01bb
--- /dev/null
+++ b/net/rxrpc/call_object.c
@@ -0,0 +1,804 @@
+/* RxRPC individual remote procedure call handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/circ_buf.h>
+#include <linux/spinlock_types.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * Maximum lifetime of a call (in jiffies).
+ */
+unsigned int rxrpc_max_call_lifetime = 60 * HZ;
+
+/*
+ * Time till dead call expires after last use (in jiffies).
+ */
+unsigned int rxrpc_dead_call_expiry = 2 * HZ;
+
+const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
+ [RXRPC_CALL_UNINITIALISED] = "Uninit",
+ [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
+ [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
+ [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
+ [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
+ [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK",
+ [RXRPC_CALL_SERVER_SECURING] = "SvSecure",
+ [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept",
+ [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
+ [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
+ [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
+ [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
+ [RXRPC_CALL_COMPLETE] = "Complete",
+ [RXRPC_CALL_SERVER_BUSY] = "SvBusy ",
+ [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
+ [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
+ [RXRPC_CALL_NETWORK_ERROR] = "NetError",
+ [RXRPC_CALL_DEAD] = "Dead ",
+};
+
+struct kmem_cache *rxrpc_call_jar;
+LIST_HEAD(rxrpc_calls);
+DEFINE_RWLOCK(rxrpc_call_lock);
+
+static void rxrpc_destroy_call(struct work_struct *work);
+static void rxrpc_call_life_expired(unsigned long _call);
+static void rxrpc_dead_call_expired(unsigned long _call);
+static void rxrpc_ack_time_expired(unsigned long _call);
+static void rxrpc_resend_time_expired(unsigned long _call);
+
+/*
+ * find an extant server call
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
+ unsigned long user_call_ID)
+{
+ struct rxrpc_call *call;
+ struct rb_node *p;
+
+ _enter("%p,%lx", rx, user_call_ID);
+
+ read_lock(&rx->call_lock);
+
+ p = rx->calls.rb_node;
+ while (p) {
+ call = rb_entry(p, struct rxrpc_call, sock_node);
+
+ if (user_call_ID < call->user_call_ID)
+ p = p->rb_left;
+ else if (user_call_ID > call->user_call_ID)
+ p = p->rb_right;
+ else
+ goto found_extant_call;
+ }
+
+ read_unlock(&rx->call_lock);
+ _leave(" = NULL");
+ return NULL;
+
+found_extant_call:
+ rxrpc_get_call(call);
+ read_unlock(&rx->call_lock);
+ _leave(" = %p [%d]", call, atomic_read(&call->usage));
+ return call;
+}
+
+/*
+ * allocate a new call
+ */
+static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
+{
+ struct rxrpc_call *call;
+
+ call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
+ if (!call)
+ return NULL;
+
+ call->acks_winsz = 16;
+ call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long),
+ gfp);
+ if (!call->acks_window) {
+ kmem_cache_free(rxrpc_call_jar, call);
+ return NULL;
+ }
+
+ setup_timer(&call->lifetimer, &rxrpc_call_life_expired,
+ (unsigned long) call);
+ setup_timer(&call->deadspan, &rxrpc_dead_call_expired,
+ (unsigned long) call);
+ setup_timer(&call->ack_timer, &rxrpc_ack_time_expired,
+ (unsigned long) call);
+ setup_timer(&call->resend_timer, &rxrpc_resend_time_expired,
+ (unsigned long) call);
+ INIT_WORK(&call->destroyer, &rxrpc_destroy_call);
+ INIT_WORK(&call->processor, &rxrpc_process_call);
+ INIT_LIST_HEAD(&call->link);
+ INIT_LIST_HEAD(&call->accept_link);
+ skb_queue_head_init(&call->rx_queue);
+ skb_queue_head_init(&call->rx_oos_queue);
+ init_waitqueue_head(&call->tx_waitq);
+ spin_lock_init(&call->lock);
+ rwlock_init(&call->state_lock);
+ atomic_set(&call->usage, 1);
+ call->debug_id = atomic_inc_return(&rxrpc_debug_id);
+
+ memset(&call->sock_node, 0xed, sizeof(call->sock_node));
+
+ call->rx_data_expect = 1;
+ call->rx_data_eaten = 0;
+ call->rx_first_oos = 0;
+ call->ackr_win_top = call->rx_data_eaten + 1 + rxrpc_rx_window_size;
+ call->creation_jif = jiffies;
+ return call;
+}
+
+/*
+ * Allocate a new client call.
+ */
+static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
+ struct sockaddr_rxrpc *srx,
+ gfp_t gfp)
+{
+ struct rxrpc_call *call;
+
+ _enter("");
+
+ ASSERT(rx->local != NULL);
+
+ call = rxrpc_alloc_call(gfp);
+ if (!call)
+ return ERR_PTR(-ENOMEM);
+ call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
+
+ sock_hold(&rx->sk);
+ call->socket = rx;
+ call->rx_data_post = 1;
+
+ call->local = rx->local;
+ call->service_id = srx->srx_service;
+ call->in_clientflag = 0;
+
+ _leave(" = %p", call);
+ return call;
+}
+
+/*
+ * Begin client call.
+ */
+static int rxrpc_begin_client_call(struct rxrpc_call *call,
+ struct rxrpc_conn_parameters *cp,
+ struct sockaddr_rxrpc *srx,
+ gfp_t gfp)
+{
+ int ret;
+
+ /* Set up or get a connection record and set the protocol parameters,
+ * including channel number and call ID.
+ */
+ ret = rxrpc_connect_call(call, cp, srx, gfp);
+ if (ret < 0)
+ return ret;
+
+ call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
+
+ spin_lock(&call->conn->params.peer->lock);
+ hlist_add_head(&call->error_link, &call->conn->params.peer->error_targets);
+ spin_unlock(&call->conn->params.peer->lock);
+
+ call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime;
+ add_timer(&call->lifetimer);
+ return 0;
+}
+
+/*
+ * set up a call for the given data
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
+ struct rxrpc_conn_parameters *cp,
+ struct sockaddr_rxrpc *srx,
+ unsigned long user_call_ID,
+ gfp_t gfp)
+{
+ struct rxrpc_call *call, *xcall;
+ struct rb_node *parent, **pp;
+ int ret;
+
+ _enter("%p,%lx", rx, user_call_ID);
+
+ call = rxrpc_alloc_client_call(rx, srx, gfp);
+ if (IS_ERR(call)) {
+ _leave(" = %ld", PTR_ERR(call));
+ return call;
+ }
+
+ /* Publish the call, even though it is incompletely set up as yet */
+ call->user_call_ID = user_call_ID;
+ __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
+
+ write_lock(&rx->call_lock);
+
+ pp = &rx->calls.rb_node;
+ parent = NULL;
+ while (*pp) {
+ parent = *pp;
+ xcall = rb_entry(parent, struct rxrpc_call, sock_node);
+
+ if (user_call_ID < xcall->user_call_ID)
+ pp = &(*pp)->rb_left;
+ else if (user_call_ID > xcall->user_call_ID)
+ pp = &(*pp)->rb_right;
+ else
+ goto found_user_ID_now_present;
+ }
+
+ rxrpc_get_call(call);
+
+ rb_link_node(&call->sock_node, parent, pp);
+ rb_insert_color(&call->sock_node, &rx->calls);
+ write_unlock(&rx->call_lock);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_add_tail(&call->link, &rxrpc_calls);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ ret = rxrpc_begin_client_call(call, cp, srx, gfp);
+ if (ret < 0)
+ goto error;
+
+ _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
+
+ _leave(" = %p [new]", call);
+ return call;
+
+error:
+ write_lock(&rx->call_lock);
+ rb_erase(&call->sock_node, &rx->calls);
+ write_unlock(&rx->call_lock);
+ rxrpc_put_call(call);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_del_init(&call->link);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ call->state = RXRPC_CALL_DEAD;
+ rxrpc_put_call(call);
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
+
+ /* We unexpectedly found the user ID in the list after taking
+ * the call_lock. This shouldn't happen unless the user races
+ * with itself and tries to add the same user ID twice at the
+ * same time in different threads.
+ */
+found_user_ID_now_present:
+ write_unlock(&rx->call_lock);
+ call->state = RXRPC_CALL_DEAD;
+ rxrpc_put_call(call);
+ _leave(" = -EEXIST [%p]", call);
+ return ERR_PTR(-EEXIST);
+}
+
+/*
+ * set up an incoming call
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
+ struct rxrpc_connection *conn,
+ struct sk_buff *skb)
+{
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ struct rxrpc_call *call, *candidate;
+ u32 call_id, chan;
+
+ _enter(",%d", conn->debug_id);
+
+ ASSERT(rx != NULL);
+
+ candidate = rxrpc_alloc_call(GFP_NOIO);
+ if (!candidate)
+ return ERR_PTR(-EBUSY);
+
+ chan = sp->hdr.cid & RXRPC_CHANNELMASK;
+ candidate->socket = rx;
+ candidate->conn = conn;
+ candidate->cid = sp->hdr.cid;
+ candidate->call_id = sp->hdr.callNumber;
+ candidate->channel = chan;
+ candidate->rx_data_post = 0;
+ candidate->state = RXRPC_CALL_SERVER_ACCEPTING;
+ if (conn->security_ix > 0)
+ candidate->state = RXRPC_CALL_SERVER_SECURING;
+
+ spin_lock(&conn->channel_lock);
+
+ /* set the channel for this call */
+ call = rcu_dereference_protected(conn->channels[chan].call,
+ lockdep_is_held(&conn->channel_lock));
+
+ _debug("channel[%u] is %p", candidate->channel, call);
+ if (call && call->call_id == sp->hdr.callNumber) {
+ /* already set; must've been a duplicate packet */
+ _debug("extant call [%d]", call->state);
+ ASSERTCMP(call->conn, ==, conn);
+
+ read_lock(&call->state_lock);
+ switch (call->state) {
+ case RXRPC_CALL_LOCALLY_ABORTED:
+ if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events))
+ rxrpc_queue_call(call);
+ case RXRPC_CALL_REMOTELY_ABORTED:
+ read_unlock(&call->state_lock);
+ goto aborted_call;
+ default:
+ rxrpc_get_call(call);
+ read_unlock(&call->state_lock);
+ goto extant_call;
+ }
+ }
+
+ if (call) {
+ /* it seems the channel is still in use from the previous call
+ * - ditch the old binding if its call is now complete */
+ _debug("CALL: %u { %s }",
+ call->debug_id, rxrpc_call_states[call->state]);
+
+ if (call->state >= RXRPC_CALL_COMPLETE) {
+ __rxrpc_disconnect_call(call);
+ } else {
+ spin_unlock(&conn->channel_lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = -EBUSY");
+ return ERR_PTR(-EBUSY);
+ }
+ }
+
+ /* check the call number isn't duplicate */
+ _debug("check dup");
+ call_id = sp->hdr.callNumber;
+
+ /* We just ignore calls prior to the current call ID. Terminated calls
+ * are handled via the connection.
+ */
+ if (call_id <= conn->channels[chan].call_counter)
+ goto old_call; /* TODO: Just drop packet */
+
+ /* make the call available */
+ _debug("new call");
+ call = candidate;
+ candidate = NULL;
+ conn->channels[chan].call_counter = call_id;
+ rcu_assign_pointer(conn->channels[chan].call, call);
+ sock_hold(&rx->sk);
+ rxrpc_get_connection(conn);
+ spin_unlock(&conn->channel_lock);
+
+ spin_lock(&conn->params.peer->lock);
+ hlist_add_head(&call->error_link, &conn->params.peer->error_targets);
+ spin_unlock(&conn->params.peer->lock);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_add_tail(&call->link, &rxrpc_calls);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ call->local = conn->params.local;
+ call->epoch = conn->proto.epoch;
+ call->service_id = conn->params.service_id;
+ call->in_clientflag = RXRPC_CLIENT_INITIATED;
+
+ _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
+
+ call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime;
+ add_timer(&call->lifetimer);
+ _leave(" = %p {%d} [new]", call, call->debug_id);
+ return call;
+
+extant_call:
+ spin_unlock(&conn->channel_lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1);
+ return call;
+
+aborted_call:
+ spin_unlock(&conn->channel_lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = -ECONNABORTED");
+ return ERR_PTR(-ECONNABORTED);
+
+old_call:
+ spin_unlock(&conn->channel_lock);
+ kmem_cache_free(rxrpc_call_jar, candidate);
+ _leave(" = -ECONNRESET [old]");
+ return ERR_PTR(-ECONNRESET);
+}
+
+/*
+ * detach a call from a socket and set up for release
+ */
+void rxrpc_release_call(struct rxrpc_call *call)
+{
+ struct rxrpc_connection *conn = call->conn;
+ struct rxrpc_sock *rx = call->socket;
+
+ _enter("{%d,%d,%d,%d}",
+ call->debug_id, atomic_read(&call->usage),
+ atomic_read(&call->ackr_not_idle),
+ call->rx_first_oos);
+
+ spin_lock_bh(&call->lock);
+ if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
+ BUG();
+ spin_unlock_bh(&call->lock);
+
+ /* dissociate from the socket
+ * - the socket's ref on the call is passed to the death timer
+ */
+ _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
+
+ spin_lock(&conn->params.peer->lock);
+ hlist_del_init(&call->error_link);
+ spin_unlock(&conn->params.peer->lock);
+
+ write_lock_bh(&rx->call_lock);
+ if (!list_empty(&call->accept_link)) {
+ _debug("unlinking once-pending call %p { e=%lx f=%lx }",
+ call, call->events, call->flags);
+ ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
+ list_del_init(&call->accept_link);
+ sk_acceptq_removed(&rx->sk);
+ } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
+ rb_erase(&call->sock_node, &rx->calls);
+ memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
+ clear_bit(RXRPC_CALL_HAS_USERID, &call->flags);
+ }
+ write_unlock_bh(&rx->call_lock);
+
+ /* free up the channel for reuse */
+ write_lock_bh(&call->state_lock);
+
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ call->state != RXRPC_CALL_CLIENT_FINAL_ACK) {
+ _debug("+++ ABORTING STATE %d +++\n", call->state);
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->local_abort = RX_CALL_DEAD;
+ }
+ write_unlock_bh(&call->state_lock);
+
+ rxrpc_disconnect_call(call);
+
+ /* clean up the Rx queue */
+ if (!skb_queue_empty(&call->rx_queue) ||
+ !skb_queue_empty(&call->rx_oos_queue)) {
+ struct rxrpc_skb_priv *sp;
+ struct sk_buff *skb;
+
+ _debug("purge Rx queues");
+
+ spin_lock_bh(&call->lock);
+ while ((skb = skb_dequeue(&call->rx_queue)) ||
+ (skb = skb_dequeue(&call->rx_oos_queue))) {
+ sp = rxrpc_skb(skb);
+ if (sp->call) {
+ ASSERTCMP(sp->call, ==, call);
+ rxrpc_put_call(call);
+ sp->call = NULL;
+ }
+ skb->destructor = NULL;
+ spin_unlock_bh(&call->lock);
+
+ _debug("- zap %s %%%u #%u",
+ rxrpc_pkts[sp->hdr.type],
+ sp->hdr.serial, sp->hdr.seq);
+ rxrpc_free_skb(skb);
+ spin_lock_bh(&call->lock);
+ }
+ spin_unlock_bh(&call->lock);
+
+ ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE);
+ }
+
+ del_timer_sync(&call->resend_timer);
+ del_timer_sync(&call->ack_timer);
+ del_timer_sync(&call->lifetimer);
+ call->deadspan.expires = jiffies + rxrpc_dead_call_expiry;
+ add_timer(&call->deadspan);
+
+ _leave("");
+}
+
+/*
+ * handle a dead call being ready for reaping
+ */
+static void rxrpc_dead_call_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ _enter("{%d}", call->debug_id);
+
+ write_lock_bh(&call->state_lock);
+ call->state = RXRPC_CALL_DEAD;
+ write_unlock_bh(&call->state_lock);
+ rxrpc_put_call(call);
+}
+
+/*
+ * mark a call as to be released, aborting it if it's still in progress
+ * - called with softirqs disabled
+ */
+static void rxrpc_mark_call_released(struct rxrpc_call *call)
+{
+ bool sched;
+
+ write_lock(&call->state_lock);
+ if (call->state < RXRPC_CALL_DEAD) {
+ sched = false;
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ _debug("abort call %p", call);
+ call->state = RXRPC_CALL_LOCALLY_ABORTED;
+ call->local_abort = RX_CALL_DEAD;
+ if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events))
+ sched = true;
+ }
+ if (!test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events))
+ sched = true;
+ if (sched)
+ rxrpc_queue_call(call);
+ }
+ write_unlock(&call->state_lock);
+}
+
+/*
+ * release all the calls associated with a socket
+ */
+void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
+{
+ struct rxrpc_call *call;
+ struct rb_node *p;
+
+ _enter("%p", rx);
+
+ read_lock_bh(&rx->call_lock);
+
+ /* mark all the calls as no longer wanting incoming packets */
+ for (p = rb_first(&rx->calls); p; p = rb_next(p)) {
+ call = rb_entry(p, struct rxrpc_call, sock_node);
+ rxrpc_mark_call_released(call);
+ }
+
+ /* kill the not-yet-accepted incoming calls */
+ list_for_each_entry(call, &rx->secureq, accept_link) {
+ rxrpc_mark_call_released(call);
+ }
+
+ list_for_each_entry(call, &rx->acceptq, accept_link) {
+ rxrpc_mark_call_released(call);
+ }
+
+ read_unlock_bh(&rx->call_lock);
+ _leave("");
+}
+
+/*
+ * release a call
+ */
+void __rxrpc_put_call(struct rxrpc_call *call)
+{
+ ASSERT(call != NULL);
+
+ _enter("%p{u=%d}", call, atomic_read(&call->usage));
+
+ ASSERTCMP(atomic_read(&call->usage), >, 0);
+
+ if (atomic_dec_and_test(&call->usage)) {
+ _debug("call %d dead", call->debug_id);
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+ rxrpc_queue_work(&call->destroyer);
+ }
+ _leave("");
+}
+
+/*
+ * Final call destruction under RCU.
+ */
+static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
+{
+ struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
+
+ rxrpc_purge_queue(&call->rx_queue);
+ kmem_cache_free(rxrpc_call_jar, call);
+}
+
+/*
+ * clean up a call
+ */
+static void rxrpc_cleanup_call(struct rxrpc_call *call)
+{
+ _net("DESTROY CALL %d", call->debug_id);
+
+ ASSERT(call->socket);
+
+ memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
+
+ del_timer_sync(&call->lifetimer);
+ del_timer_sync(&call->deadspan);
+ del_timer_sync(&call->ack_timer);
+ del_timer_sync(&call->resend_timer);
+
+ ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
+ ASSERTCMP(call->events, ==, 0);
+ if (work_pending(&call->processor)) {
+ _debug("defer destroy");
+ rxrpc_queue_work(&call->destroyer);
+ return;
+ }
+
+ ASSERTCMP(call->conn, ==, NULL);
+
+ if (call->acks_window) {
+ _debug("kill Tx window %d",
+ CIRC_CNT(call->acks_head, call->acks_tail,
+ call->acks_winsz));
+ smp_mb();
+ while (CIRC_CNT(call->acks_head, call->acks_tail,
+ call->acks_winsz) > 0) {
+ struct rxrpc_skb_priv *sp;
+ unsigned long _skb;
+
+ _skb = call->acks_window[call->acks_tail] & ~1;
+ sp = rxrpc_skb((struct sk_buff *)_skb);
+ _debug("+++ clear Tx %u", sp->hdr.seq);
+ rxrpc_free_skb((struct sk_buff *)_skb);
+ call->acks_tail =
+ (call->acks_tail + 1) & (call->acks_winsz - 1);
+ }
+
+ kfree(call->acks_window);
+ }
+
+ rxrpc_free_skb(call->tx_pending);
+
+ rxrpc_purge_queue(&call->rx_queue);
+ ASSERT(skb_queue_empty(&call->rx_oos_queue));
+ sock_put(&call->socket->sk);
+ call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
+}
+
+/*
+ * destroy a call
+ */
+static void rxrpc_destroy_call(struct work_struct *work)
+{
+ struct rxrpc_call *call =
+ container_of(work, struct rxrpc_call, destroyer);
+
+ _enter("%p{%d,%d,%p}",
+ call, atomic_read(&call->usage), call->channel, call->conn);
+
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+
+ write_lock_bh(&rxrpc_call_lock);
+ list_del_init(&call->link);
+ write_unlock_bh(&rxrpc_call_lock);
+
+ rxrpc_cleanup_call(call);
+ _leave("");
+}
+
+/*
+ * preemptively destroy all the call records from a transport endpoint rather
+ * than waiting for them to time out
+ */
+void __exit rxrpc_destroy_all_calls(void)
+{
+ struct rxrpc_call *call;
+
+ _enter("");
+ write_lock_bh(&rxrpc_call_lock);
+
+ while (!list_empty(&rxrpc_calls)) {
+ call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
+ _debug("Zapping call %p", call);
+
+ list_del_init(&call->link);
+
+ switch (atomic_read(&call->usage)) {
+ case 0:
+ ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+ break;
+ case 1:
+ if (del_timer_sync(&call->deadspan) != 0 &&
+ call->state != RXRPC_CALL_DEAD)
+ rxrpc_dead_call_expired((unsigned long) call);
+ if (call->state != RXRPC_CALL_DEAD)
+ break;
+ default:
+ pr_err("Call %p still in use (%d,%d,%s,%lx,%lx)!\n",
+ call, atomic_read(&call->usage),
+ atomic_read(&call->ackr_not_idle),
+ rxrpc_call_states[call->state],
+ call->flags, call->events);
+ if (!skb_queue_empty(&call->rx_queue))
+ pr_err("Rx queue occupied\n");
+ if (!skb_queue_empty(&call->rx_oos_queue))
+ pr_err("OOS queue occupied\n");
+ break;
+ }
+
+ write_unlock_bh(&rxrpc_call_lock);
+ cond_resched();
+ write_lock_bh(&rxrpc_call_lock);
+ }
+
+ write_unlock_bh(&rxrpc_call_lock);
+ _leave("");
+}
+
+/*
+ * handle call lifetime being exceeded
+ */
+static void rxrpc_call_life_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ _enter("{%d}", call->debug_id);
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE) {
+ set_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events);
+ rxrpc_queue_call(call);
+ }
+ read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * handle resend timer expiry
+ * - may not take call->state_lock as this can deadlock against del_timer_sync()
+ */
+static void rxrpc_resend_time_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ _enter("{%d}", call->debug_id);
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+ if (!test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events))
+ rxrpc_queue_call(call);
+}
+
+/*
+ * handle ACK timer expiry
+ */
+static void rxrpc_ack_time_expired(unsigned long _call)
+{
+ struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+ _enter("{%d}", call->debug_id);
+
+ if (call->state >= RXRPC_CALL_COMPLETE)
+ return;
+
+ read_lock_bh(&call->state_lock);
+ if (call->state < RXRPC_CALL_COMPLETE &&
+ !test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events))
+ rxrpc_queue_call(call);
+ read_unlock_bh(&call->state_lock);
+}