// SPDX-License-Identifier: GPL-2.0-or-later
/* RxRPC individual remote procedure call handling
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#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"

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_SERVER_PREALLOC]            = "SvPrealc",
        [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",
};

const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
        [RXRPC_CALL_SUCCEEDED]                  = "Complete",
        [RXRPC_CALL_REMOTELY_ABORTED]           = "RmtAbort",
        [RXRPC_CALL_LOCALLY_ABORTED]            = "LocAbort",
        [RXRPC_CALL_LOCAL_ERROR]                = "LocError",
        [RXRPC_CALL_NETWORK_ERROR]              = "NetError",
};

struct kmem_cache *rxrpc_call_jar;

static DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000);
static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000);

void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
{
        struct rxrpc_local *local = call->local;
        bool busy;

        if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
                spin_lock_irq(&local->lock);
                busy = !list_empty(&call->attend_link);
                trace_rxrpc_poke_call(call, busy, what);
                if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke))
                        busy = true;
                if (!busy) {
                        list_add_tail(&call->attend_link, &local->call_attend_q);
                }
                spin_unlock_irq(&local->lock);
                if (!busy)
                        rxrpc_wake_up_io_thread(local);
        }
}

static void rxrpc_call_timer_expired(struct timer_list *t)
{
        struct rxrpc_call *call = timer_container_of(call, t, timer);

        _enter("%d", call->debug_id);

        if (!__rxrpc_call_is_complete(call)) {
                trace_rxrpc_timer_expired(call);
                rxrpc_poke_call(call, rxrpc_call_poke_timer);
        }
}

static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;

static void rxrpc_destroy_call(struct work_struct *);

/*
 * 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, rxrpc_call_get_sendmsg);
        read_unlock(&rx->call_lock);
        _leave(" = %p [%d]", call, refcount_read(&call->ref));
        return call;
}

/*
 * allocate a new call
 */
struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
                                    unsigned int debug_id)
{
        struct rxrpc_call *call;
        struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));

        call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
        if (!call)
                return NULL;

        mutex_init(&call->user_mutex);

        /* Prevent lockdep reporting a deadlock false positive between the afs
         * filesystem and sys_sendmsg() via the mmap sem.
         */
        if (rx->sk.sk_kern_sock)
                lockdep_set_class(&call->user_mutex,
                                  &rxrpc_call_user_mutex_lock_class_key);

        timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
        INIT_WORK(&call->destroyer, rxrpc_destroy_call);
        INIT_LIST_HEAD(&call->link);
        INIT_LIST_HEAD(&call->wait_link);
        INIT_LIST_HEAD(&call->accept_link);
        INIT_LIST_HEAD(&call->recvmsg_link);
        INIT_LIST_HEAD(&call->sock_link);
        INIT_LIST_HEAD(&call->attend_link);
        skb_queue_head_init(&call->recvmsg_queue);
        skb_queue_head_init(&call->rx_queue);
        skb_queue_head_init(&call->rx_oos_queue);
        init_waitqueue_head(&call->waitq);
        spin_lock_init(&call->notify_lock);
        refcount_set(&call->ref, 1);
        call->debug_id          = debug_id;
        call->tx_total_len      = -1;
        call->tx_jumbo_max      = 1;
        call->next_rx_timo      = 20 * HZ;
        call->next_req_timo     = 1 * HZ;
        call->ackr_window       = 1;
        call->ackr_wtop         = 1;
        call->delay_ack_at      = KTIME_MAX;
        call->rack_timo_at      = KTIME_MAX;
        call->ping_at           = KTIME_MAX;
        call->keepalive_at      = KTIME_MAX;
        call->expect_rx_by      = KTIME_MAX;
        call->expect_req_by     = KTIME_MAX;
        call->expect_term_by    = KTIME_MAX;

        memset(&call->sock_node, 0xed, sizeof(call->sock_node));

        call->rx_winsize = rxrpc_rx_window_size;
        call->tx_winsize = 16;

        call->cong_cwnd = RXRPC_MIN_CWND;
        call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;

        rxrpc_call_init_rtt(call);

        call->rxnet = rxnet;
        call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
        atomic_inc(&rxnet->nr_calls);
        return call;
}

/*
 * Allocate a new client call.
 */
static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
                                                  struct rxrpc_conn_parameters *cp,
                                                  struct rxrpc_call_params *p,
                                                  gfp_t gfp,
                                                  unsigned int debug_id)
{
        struct rxrpc_call *call;
        ktime_t now;
        int ret;

        _enter("");

        call = rxrpc_alloc_call(rx, gfp, debug_id);
        if (!call)
                return ERR_PTR(-ENOMEM);
        now = ktime_get_real();
        call->acks_latest_ts    = now;
        call->cong_tstamp       = now;
        call->dest_srx          = cp->peer->srx;
        call->dest_srx.srx_service = cp->service_id;
        call->interruptibility  = p->interruptibility;
        call->tx_total_len      = p->tx_total_len;
        call->key               = key_get(cp->key);
        call->peer              = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call);
        call->local             = rxrpc_get_local(cp->local, rxrpc_local_get_call);
        call->security_level    = cp->security_level;
        if (p->kernel)
                __set_bit(RXRPC_CALL_KERNEL, &call->flags);
        if (cp->upgrade)
                __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
        if (cp->exclusive)
                __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);

        if (p->timeouts.normal)
                call->next_rx_timo = umin(p->timeouts.normal, 1);
        if (p->timeouts.idle)
                call->next_req_timo = umin(p->timeouts.idle, 1);
        if (p->timeouts.hard)
                call->hard_timo = p->timeouts.hard;

        ret = rxrpc_init_client_call_security(call);
        if (ret < 0) {
                rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
                rxrpc_put_call(call, rxrpc_call_put_discard_error);
                return ERR_PTR(ret);
        }

        rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);

        trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
                         p->user_call_ID, rxrpc_call_new_client);

        _leave(" = %p", call);
        return call;
}

/*
 * Initiate the call ack/resend/expiry timer.
 */
void rxrpc_start_call_timer(struct rxrpc_call *call)
{
        if (call->hard_timo) {
                ktime_t delay = ms_to_ktime(call->hard_timo * 1000);

                call->expect_term_by = ktime_add(ktime_get_real(), delay);
                trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
        }
        call->timer.expires = jiffies;
}

/*
 * Wait for a call slot to become available.
 */
static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
{
        struct semaphore *limiter = &rxrpc_call_limiter;

        if (p->kernel)
                limiter = &rxrpc_kernel_call_limiter;
        if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
                down(limiter);
                return limiter;
        }
        return down_interruptible(limiter) < 0 ? NULL : limiter;
}

/*
 * Release a call slot.
 */
static void rxrpc_put_call_slot(struct rxrpc_call *call)
{
        struct semaphore *limiter = &rxrpc_call_limiter;

        if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
                limiter = &rxrpc_kernel_call_limiter;
        up(limiter);
}

/*
 * Start the process of connecting a call.  We obtain a peer and a connection
 * bundle, but the actual association of a call with a connection is offloaded
 * to the I/O thread to simplify locking.
 */
static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
{
        struct rxrpc_local *local = call->local;
        int ret = -ENOMEM;

        _enter("{%d,%lx},", call->debug_id, call->user_call_ID);

        ret = rxrpc_look_up_bundle(call, gfp);
        if (ret < 0)
                goto error;

        trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
        rxrpc_get_call(call, rxrpc_call_get_io_thread);
        spin_lock_irq(&local->client_call_lock);
        list_add_tail(&call->wait_link, &local->new_client_calls);
        spin_unlock_irq(&local->client_call_lock);
        rxrpc_wake_up_io_thread(local);
        return 0;

error:
        __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
        return ret;
}

/*
 * Set up a call for the given parameters.
 * - Called with the socket lock held, which it must release.
 * - If it returns a call, the call's lock will need releasing by the caller.
 */
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
                                         struct rxrpc_conn_parameters *cp,
                                         struct rxrpc_call_params *p,
                                         gfp_t gfp,
                                         unsigned int debug_id)
        __releases(&rx->sk.sk_lock)
        __acquires(&call->user_mutex)
{
        struct rxrpc_call *call, *xcall;
        struct rxrpc_net *rxnet;
        struct semaphore *limiter;
        struct rb_node *parent, **pp;
        int ret;

        _enter("%p,%lx", rx, p->user_call_ID);

        if (WARN_ON_ONCE(!cp->peer)) {
                release_sock(&rx->sk);
                return ERR_PTR(-EIO);
        }

        limiter = rxrpc_get_call_slot(p, gfp);
        if (!limiter) {
                release_sock(&rx->sk);
                return ERR_PTR(-ERESTARTSYS);
        }

        call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id);
        if (IS_ERR(call)) {
                release_sock(&rx->sk);
                up(limiter);
                _leave(" = %ld", PTR_ERR(call));
                return call;
        }

        /* We need to protect a partially set up call against the user as we
         * will be acting outside the socket lock.
         */
        mutex_lock(&call->user_mutex);

        /* Publish the call, even though it is incompletely set up as yet */
        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 (p->user_call_ID < xcall->user_call_ID)
                        pp = &(*pp)->rb_left;
                else if (p->user_call_ID > xcall->user_call_ID)
                        pp = &(*pp)->rb_right;
                else
                        goto error_dup_user_ID;
        }

        rcu_assign_pointer(call->socket, rx);
        call->user_call_ID = p->user_call_ID;
        __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
        rxrpc_get_call(call, rxrpc_call_get_userid);
        rb_link_node(&call->sock_node, parent, pp);
        rb_insert_color(&call->sock_node, &rx->calls);
        list_add(&call->sock_link, &rx->sock_calls);

        write_unlock(&rx->call_lock);

        rxnet = call->rxnet;
        spin_lock(&rxnet->call_lock);
        list_add_tail_rcu(&call->link, &rxnet->calls);
        spin_unlock(&rxnet->call_lock);

        /* From this point on, the call is protected by its own lock. */
        release_sock(&rx->sk);

        /* Set up or get a connection record and set the protocol parameters,
         * including channel number and call ID.
         */
        ret = rxrpc_connect_call(call, gfp);
        if (ret < 0)
                goto error_attached_to_socket;

        _leave(" = %p [new]", call);
        return call;

        /* 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.
         */
error_dup_user_ID:
        write_unlock(&rx->call_lock);
        release_sock(&rx->sk);
        rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
        trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
                         rxrpc_call_see_userid_exists);
        mutex_unlock(&call->user_mutex);
        rxrpc_put_call(call, rxrpc_call_put_userid_exists);
        _leave(" = -EEXIST");
        return ERR_PTR(-EEXIST);

        /* We got an error, but the call is attached to the socket and is in
         * need of release.  However, we might now race with recvmsg() when it
         * completion notifies the socket.  Return 0 from sys_sendmsg() and
         * leave the error to recvmsg() to deal with.
         */
error_attached_to_socket:
        trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
                         rxrpc_call_see_connect_failed);
        rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
        _leave(" = c=%08x [err]", call->debug_id);
        return call;
}

/*
 * Set up an incoming call.  call->conn points to the connection.
 * This is called with interrupts disabled and isn't allowed to fail.
 */
void rxrpc_incoming_call(struct rxrpc_sock *rx,
                         struct rxrpc_call *call,
                         struct sk_buff *skb)
{
        struct rxrpc_connection *conn = call->conn;
        struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
        u32 chan;

        _enter(",%d", call->conn->debug_id);

        rcu_assign_pointer(call->socket, rx);
        call->call_id           = sp->hdr.callNumber;
        call->dest_srx.srx_service = sp->hdr.serviceId;
        call->cid               = sp->hdr.cid;
        call->cong_tstamp       = skb->tstamp;

        __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
        rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);

        spin_lock(&conn->state_lock);

        switch (conn->state) {
        case RXRPC_CONN_SERVICE_UNSECURED:
        case RXRPC_CONN_SERVICE_CHALLENGING:
                __set_bit(RXRPC_CALL_CONN_CHALLENGING, &call->flags);
                break;
        case RXRPC_CONN_SERVICE:
                break;

        case RXRPC_CONN_ABORTED:
                rxrpc_set_call_completion(call, conn->completion,
                                          conn->abort_code, conn->error);
                break;
        default:
                BUG();
        }

        rxrpc_get_call(call, rxrpc_call_get_io_thread);

        /* Set the channel for this call.  We don't get channel_lock as we're
         * only defending against the data_ready handler (which we're called
         * from) and the RESPONSE packet parser (which is only really
         * interested in call_counter and can cope with a disagreement with the
         * call pointer).
         */
        chan = sp->hdr.cid & RXRPC_CHANNELMASK;
        conn->channels[chan].call_counter = call->call_id;
        conn->channels[chan].call_id = call->call_id;
        conn->channels[chan].call = call;
        spin_unlock(&conn->state_lock);

        spin_lock(&conn->peer->lock);
        hlist_add_head(&call->error_link, &conn->peer->error_targets);
        spin_unlock(&conn->peer->lock);

        rxrpc_start_call_timer(call);
        _leave("");
}

/*
 * Note the re-emergence of a call.
 */
void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
{
        if (call) {
                int r = refcount_read(&call->ref);

                trace_rxrpc_call(call->debug_id, r, 0, why);
        }
}

struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
                                      enum rxrpc_call_trace why)
{
        int r;

        if (!call || !__refcount_inc_not_zero(&call->ref, &r))
                return NULL;
        trace_rxrpc_call(call->debug_id, r + 1, 0, why);
        return call;
}

/*
 * Note the addition of a ref on a call.
 */
void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
{
        int r;

        __refcount_inc(&call->ref, &r);
        trace_rxrpc_call(call->debug_id, r + 1, 0, why);
}

/*
 * Clean up the transmission buffers.
 */
static void rxrpc_cleanup_tx_buffers(struct rxrpc_call *call)
{
        struct rxrpc_txqueue *tq, *next;

        for (tq = call->tx_queue; tq; tq = next) {
                next = tq->next;
                for (int i = 0; i < RXRPC_NR_TXQUEUE; i++)
                        if (tq->bufs[i])
                                rxrpc_put_txbuf(tq->bufs[i], rxrpc_txbuf_put_cleaned);
                trace_rxrpc_tq(call, tq, 0, rxrpc_tq_cleaned);
                kfree(tq);
        }
}

/*
 * Clean up the receive buffers.
 */
static void rxrpc_cleanup_rx_buffers(struct rxrpc_call *call)
{
        rxrpc_purge_queue(&call->recvmsg_queue);
        rxrpc_purge_queue(&call->rx_queue);
        rxrpc_purge_queue(&call->rx_oos_queue);
}

/*
 * Detach a call from its owning socket.
 */
void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
{
        struct rxrpc_connection *conn = call->conn;
        bool putu = false;

        _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));

        trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
                         call->flags, rxrpc_call_see_release);

        if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
                BUG();

        rxrpc_put_call_slot(call);

        /* Note that at this point, the call may still be on or may have been
         * added back on to the socket receive queue.  recvmsg() must discard
         * released calls.  The CALL_RELEASED flag should prevent further
         * notifications.
         */
        spin_lock_irq(&rx->recvmsg_lock);
        spin_unlock_irq(&rx->recvmsg_lock);

        write_lock(&rx->call_lock);

        if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
                rb_erase(&call->sock_node, &rx->calls);
                memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
                putu = true;
        }

        list_del(&call->sock_link);
        write_unlock(&rx->call_lock);

        _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);

        if (putu)
                rxrpc_put_call(call, rxrpc_call_put_userid);

        _leave("");
}

/*
 * release all the calls associated with a socket
 */
void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
{
        struct rxrpc_call *call;

        _enter("%p", rx);

        while (!list_empty(&rx->to_be_accepted)) {
                call = list_entry(rx->to_be_accepted.next,
                                  struct rxrpc_call, accept_link);
                list_del(&call->accept_link);
                rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
                                    rxrpc_abort_call_sock_release_tba);
                rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
        }

        while (!list_empty(&rx->sock_calls)) {
                call = list_entry(rx->sock_calls.next,
                                  struct rxrpc_call, sock_link);
                rxrpc_get_call(call, rxrpc_call_get_release_sock);
                rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
                                    rxrpc_abort_call_sock_release);
                rxrpc_release_call(rx, call);
                rxrpc_put_call(call, rxrpc_call_put_release_sock);
        }

        while ((call = list_first_entry_or_null(&rx->recvmsg_q,
                                                struct rxrpc_call, recvmsg_link))) {
                list_del_init(&call->recvmsg_link);
                rxrpc_put_call(call, rxrpc_call_put_release_recvmsg_q);
        }

        _leave("");
}

/*
 * release a call
 */
void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
{
        struct rxrpc_net *rxnet = call->rxnet;
        unsigned int debug_id = call->debug_id;
        bool dead;
        int r;

        ASSERT(call != NULL);

        dead = __refcount_dec_and_test(&call->ref, &r);
        trace_rxrpc_call(debug_id, r - 1, 0, why);
        if (dead) {
                ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);

                if (!list_empty(&call->link)) {
                        spin_lock(&rxnet->call_lock);
                        list_del_init(&call->link);
                        spin_unlock(&rxnet->call_lock);
                }

                rxrpc_cleanup_call(call);
        }
}

/*
 * Free up the call under RCU.
 */
static void rxrpc_rcu_free_call(struct rcu_head *rcu)
{
        struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
        struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);

        kmem_cache_free(rxrpc_call_jar, call);
        if (atomic_dec_and_test(&rxnet->nr_calls))
                wake_up_var(&rxnet->nr_calls);
}

/*
 * Final call destruction - but must be done in process context.
 */
static void rxrpc_destroy_call(struct work_struct *work)
{
        struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);

        timer_delete_sync(&call->timer);

        rxrpc_cleanup_tx_buffers(call);
        rxrpc_cleanup_rx_buffers(call);
        rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
        rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
        rxrpc_deactivate_bundle(call->bundle);
        rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
        rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
        rxrpc_put_local(call->local, rxrpc_local_put_call);
        call_rcu(&call->rcu, rxrpc_rcu_free_call);
}

/*
 * clean up a call
 */
void rxrpc_cleanup_call(struct rxrpc_call *call)
{
        memset(&call->sock_node, 0xcd, sizeof(call->sock_node));

        ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
        ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));

        timer_delete(&call->timer);

        if (rcu_read_lock_held())
                /* Can't use the rxrpc workqueue as we need to cancel/flush
                 * something that may be running/waiting there.
                 */
                schedule_work(&call->destroyer);
        else
                rxrpc_destroy_call(&call->destroyer);
}

/*
 * Make sure that all calls are gone from a network namespace.  To reach this
 * point, any open UDP sockets in that namespace must have been closed, so any
 * outstanding calls cannot be doing I/O.
 */
void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
{
        struct rxrpc_call *call;

        _enter("");

        if (!list_empty(&rxnet->calls)) {
                spin_lock(&rxnet->call_lock);

                while (!list_empty(&rxnet->calls)) {
                        call = list_entry(rxnet->calls.next,
                                          struct rxrpc_call, link);
                        _debug("Zapping call %p", call);

                        rxrpc_see_call(call, rxrpc_call_see_zap);
                        list_del_init(&call->link);

                        pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
                               call, refcount_read(&call->ref),
                               rxrpc_call_states[__rxrpc_call_state(call)],
                               call->flags, call->events);

                        spin_unlock(&rxnet->call_lock);
                        cond_resched();
                        spin_lock(&rxnet->call_lock);
                }

                spin_unlock(&rxnet->call_lock);
        }

        atomic_dec(&rxnet->nr_calls);
        wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
}

/**
 * rxrpc_kernel_query_call_security - Query call's security parameters
 * @call: The call to query
 * @_service_id: Where to return the service ID
 * @_enctype: Where to return the "encoding type"
 *
 * This queries the security parameters of a call, setting *@_service_id and
 * *@_enctype and returning the security class.
 *
 * Return: The security class protocol number.
 */
u8 rxrpc_kernel_query_call_security(struct rxrpc_call *call,
                                    u16 *_service_id, u32 *_enctype)
{
        *_service_id = call->dest_srx.srx_service;
        *_enctype = call->security_enctype;
        return call->security_ix;
}
EXPORT_SYMBOL(rxrpc_kernel_query_call_security);