forked from Minki/linux
54fde42345
Fix the following checker warning:
net/rxrpc/call_object.c:279 rxrpc_new_client_call()
warn: passing zero to 'ERR_PTR'
where a value that's always zero is passed to ERR_PTR() so that it can be
passed to a tracepoint in an auxiliary pointer field.
Just pass NULL instead to the tracepoint.
Fixes: a84a46d730
("rxrpc: Add some additional call tracing")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David Howells <dhowells@redhat.com>
609 lines
16 KiB
C
609 lines
16 KiB
C
/* RxRPC individual remote procedure call handling
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*
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* Copyright (C) 2007 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/circ_buf.h>
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#include <linux/spinlock_types.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "ar-internal.h"
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const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
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[RXRPC_CALL_UNINITIALISED] = "Uninit ",
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[RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
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[RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
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[RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
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[RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
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[RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc",
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[RXRPC_CALL_SERVER_SECURING] = "SvSecure",
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[RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept",
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[RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
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[RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
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[RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
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[RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
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[RXRPC_CALL_COMPLETE] = "Complete",
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};
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const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
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[RXRPC_CALL_SUCCEEDED] = "Complete",
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[RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
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[RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
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[RXRPC_CALL_LOCAL_ERROR] = "LocError",
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[RXRPC_CALL_NETWORK_ERROR] = "NetError",
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};
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const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = {
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[rxrpc_call_new_client] = "NWc",
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[rxrpc_call_new_service] = "NWs",
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[rxrpc_call_queued] = "QUE",
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[rxrpc_call_queued_ref] = "QUR",
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[rxrpc_call_connected] = "CON",
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[rxrpc_call_release] = "RLS",
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[rxrpc_call_seen] = "SEE",
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[rxrpc_call_got] = "GOT",
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[rxrpc_call_got_userid] = "Gus",
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[rxrpc_call_got_kernel] = "Gke",
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[rxrpc_call_put] = "PUT",
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[rxrpc_call_put_userid] = "Pus",
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[rxrpc_call_put_kernel] = "Pke",
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[rxrpc_call_put_noqueue] = "PNQ",
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[rxrpc_call_error] = "*E*",
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};
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struct kmem_cache *rxrpc_call_jar;
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LIST_HEAD(rxrpc_calls);
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DEFINE_RWLOCK(rxrpc_call_lock);
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static void rxrpc_call_timer_expired(unsigned long _call)
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{
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struct rxrpc_call *call = (struct rxrpc_call *)_call;
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_enter("%d", call->debug_id);
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if (call->state < RXRPC_CALL_COMPLETE)
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rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real());
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}
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/*
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* find an extant server call
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* - called in process context with IRQs enabled
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*/
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struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
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unsigned long user_call_ID)
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{
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struct rxrpc_call *call;
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struct rb_node *p;
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_enter("%p,%lx", rx, user_call_ID);
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read_lock(&rx->call_lock);
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p = rx->calls.rb_node;
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while (p) {
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call = rb_entry(p, struct rxrpc_call, sock_node);
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if (user_call_ID < call->user_call_ID)
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p = p->rb_left;
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else if (user_call_ID > call->user_call_ID)
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p = p->rb_right;
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else
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goto found_extant_call;
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}
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read_unlock(&rx->call_lock);
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_leave(" = NULL");
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return NULL;
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found_extant_call:
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rxrpc_get_call(call, rxrpc_call_got);
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read_unlock(&rx->call_lock);
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_leave(" = %p [%d]", call, atomic_read(&call->usage));
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return call;
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}
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/*
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* allocate a new call
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*/
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struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
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{
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struct rxrpc_call *call;
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call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
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if (!call)
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return NULL;
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call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
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sizeof(struct sk_buff *),
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gfp);
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if (!call->rxtx_buffer)
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goto nomem;
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call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
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if (!call->rxtx_annotations)
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goto nomem_2;
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setup_timer(&call->timer, rxrpc_call_timer_expired,
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(unsigned long)call);
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INIT_WORK(&call->processor, &rxrpc_process_call);
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INIT_LIST_HEAD(&call->link);
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INIT_LIST_HEAD(&call->chan_wait_link);
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INIT_LIST_HEAD(&call->accept_link);
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INIT_LIST_HEAD(&call->recvmsg_link);
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INIT_LIST_HEAD(&call->sock_link);
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init_waitqueue_head(&call->waitq);
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spin_lock_init(&call->lock);
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rwlock_init(&call->state_lock);
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atomic_set(&call->usage, 1);
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call->debug_id = atomic_inc_return(&rxrpc_debug_id);
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memset(&call->sock_node, 0xed, sizeof(call->sock_node));
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/* Leave space in the ring to handle a maxed-out jumbo packet */
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call->rx_winsize = rxrpc_rx_window_size;
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call->tx_winsize = 16;
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call->rx_expect_next = 1;
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if (RXRPC_TX_SMSS > 2190)
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call->cong_cwnd = 2;
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else if (RXRPC_TX_SMSS > 1095)
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call->cong_cwnd = 3;
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else
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call->cong_cwnd = 4;
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call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
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return call;
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nomem_2:
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kfree(call->rxtx_buffer);
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nomem:
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kmem_cache_free(rxrpc_call_jar, call);
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return NULL;
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}
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/*
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* Allocate a new client call.
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*/
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static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
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gfp_t gfp)
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{
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struct rxrpc_call *call;
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ktime_t now;
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_enter("");
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call = rxrpc_alloc_call(gfp);
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if (!call)
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return ERR_PTR(-ENOMEM);
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call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
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call->service_id = srx->srx_service;
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call->tx_phase = true;
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now = ktime_get_real();
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call->acks_latest_ts = now;
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call->cong_tstamp = now;
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_leave(" = %p", call);
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return call;
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}
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/*
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* Initiate the call ack/resend/expiry timer.
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*/
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static void rxrpc_start_call_timer(struct rxrpc_call *call)
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{
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ktime_t now = ktime_get_real(), expire_at;
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expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime);
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call->expire_at = expire_at;
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call->ack_at = expire_at;
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call->ping_at = expire_at;
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call->resend_at = expire_at;
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call->timer.expires = jiffies + LONG_MAX / 2;
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rxrpc_set_timer(call, rxrpc_timer_begin, now);
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}
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/*
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* set up a call for the given data
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* - called in process context with IRQs enabled
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*/
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struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
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struct rxrpc_conn_parameters *cp,
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struct sockaddr_rxrpc *srx,
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unsigned long user_call_ID,
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gfp_t gfp)
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{
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struct rxrpc_call *call, *xcall;
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struct rb_node *parent, **pp;
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const void *here = __builtin_return_address(0);
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int ret;
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_enter("%p,%lx", rx, user_call_ID);
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call = rxrpc_alloc_client_call(srx, gfp);
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if (IS_ERR(call)) {
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_leave(" = %ld", PTR_ERR(call));
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return call;
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}
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trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
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here, (const void *)user_call_ID);
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/* Publish the call, even though it is incompletely set up as yet */
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write_lock(&rx->call_lock);
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pp = &rx->calls.rb_node;
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parent = NULL;
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while (*pp) {
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parent = *pp;
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xcall = rb_entry(parent, struct rxrpc_call, sock_node);
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if (user_call_ID < xcall->user_call_ID)
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pp = &(*pp)->rb_left;
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else if (user_call_ID > xcall->user_call_ID)
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pp = &(*pp)->rb_right;
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else
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goto error_dup_user_ID;
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}
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rcu_assign_pointer(call->socket, rx);
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call->user_call_ID = user_call_ID;
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__set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
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rxrpc_get_call(call, rxrpc_call_got_userid);
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rb_link_node(&call->sock_node, parent, pp);
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rb_insert_color(&call->sock_node, &rx->calls);
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list_add(&call->sock_link, &rx->sock_calls);
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write_unlock(&rx->call_lock);
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write_lock(&rxrpc_call_lock);
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list_add_tail(&call->link, &rxrpc_calls);
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write_unlock(&rxrpc_call_lock);
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/* Set up or get a connection record and set the protocol parameters,
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* including channel number and call ID.
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*/
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ret = rxrpc_connect_call(call, cp, srx, gfp);
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if (ret < 0)
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goto error;
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trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
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here, NULL);
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spin_lock_bh(&call->conn->params.peer->lock);
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hlist_add_head(&call->error_link,
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&call->conn->params.peer->error_targets);
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spin_unlock_bh(&call->conn->params.peer->lock);
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rxrpc_start_call_timer(call);
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_net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
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_leave(" = %p [new]", call);
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return call;
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/* We unexpectedly found the user ID in the list after taking
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* the call_lock. This shouldn't happen unless the user races
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* with itself and tries to add the same user ID twice at the
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* same time in different threads.
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*/
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error_dup_user_ID:
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write_unlock(&rx->call_lock);
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ret = -EEXIST;
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error:
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__rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
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RX_CALL_DEAD, ret);
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trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
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here, ERR_PTR(ret));
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rxrpc_release_call(rx, call);
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rxrpc_put_call(call, rxrpc_call_put);
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_leave(" = %d", ret);
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return ERR_PTR(ret);
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}
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/*
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* Set up an incoming call. call->conn points to the connection.
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* This is called in BH context and isn't allowed to fail.
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*/
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void rxrpc_incoming_call(struct rxrpc_sock *rx,
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struct rxrpc_call *call,
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struct sk_buff *skb)
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{
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struct rxrpc_connection *conn = call->conn;
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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u32 chan;
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_enter(",%d", call->conn->debug_id);
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rcu_assign_pointer(call->socket, rx);
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call->call_id = sp->hdr.callNumber;
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call->service_id = sp->hdr.serviceId;
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call->cid = sp->hdr.cid;
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call->state = RXRPC_CALL_SERVER_ACCEPTING;
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if (sp->hdr.securityIndex > 0)
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call->state = RXRPC_CALL_SERVER_SECURING;
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call->cong_tstamp = skb->tstamp;
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/* Set the channel for this call. We don't get channel_lock as we're
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* only defending against the data_ready handler (which we're called
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* from) and the RESPONSE packet parser (which is only really
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* interested in call_counter and can cope with a disagreement with the
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* call pointer).
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*/
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chan = sp->hdr.cid & RXRPC_CHANNELMASK;
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conn->channels[chan].call_counter = call->call_id;
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conn->channels[chan].call_id = call->call_id;
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rcu_assign_pointer(conn->channels[chan].call, call);
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spin_lock(&conn->params.peer->lock);
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hlist_add_head(&call->error_link, &conn->params.peer->error_targets);
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spin_unlock(&conn->params.peer->lock);
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_net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
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rxrpc_start_call_timer(call);
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_leave("");
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}
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/*
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* Queue a call's work processor, getting a ref to pass to the work queue.
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*/
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bool rxrpc_queue_call(struct rxrpc_call *call)
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{
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const void *here = __builtin_return_address(0);
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int n = __atomic_add_unless(&call->usage, 1, 0);
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if (n == 0)
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return false;
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if (rxrpc_queue_work(&call->processor))
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trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL);
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else
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rxrpc_put_call(call, rxrpc_call_put_noqueue);
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return true;
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}
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/*
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* Queue a call's work processor, passing the callers ref to the work queue.
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*/
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bool __rxrpc_queue_call(struct rxrpc_call *call)
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{
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const void *here = __builtin_return_address(0);
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int n = atomic_read(&call->usage);
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ASSERTCMP(n, >=, 1);
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if (rxrpc_queue_work(&call->processor))
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trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL);
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else
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rxrpc_put_call(call, rxrpc_call_put_noqueue);
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return true;
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}
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/*
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* Note the re-emergence of a call.
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*/
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void rxrpc_see_call(struct rxrpc_call *call)
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{
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const void *here = __builtin_return_address(0);
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if (call) {
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int n = atomic_read(&call->usage);
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trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL);
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}
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}
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/*
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* Note the addition of a ref on a call.
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*/
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void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
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{
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const void *here = __builtin_return_address(0);
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int n = atomic_inc_return(&call->usage);
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trace_rxrpc_call(call, op, n, here, NULL);
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}
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/*
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* Detach a call from its owning socket.
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*/
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void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
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{
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const void *here = __builtin_return_address(0);
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struct rxrpc_connection *conn = call->conn;
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bool put = false;
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int i;
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_enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
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trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
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here, (const void *)call->flags);
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ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
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spin_lock_bh(&call->lock);
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if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
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BUG();
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spin_unlock_bh(&call->lock);
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del_timer_sync(&call->timer);
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/* Make sure we don't get any more notifications */
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write_lock_bh(&rx->recvmsg_lock);
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if (!list_empty(&call->recvmsg_link)) {
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_debug("unlinking once-pending call %p { e=%lx f=%lx }",
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call, call->events, call->flags);
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list_del(&call->recvmsg_link);
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put = true;
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}
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/* list_empty() must return false in rxrpc_notify_socket() */
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call->recvmsg_link.next = NULL;
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call->recvmsg_link.prev = NULL;
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write_unlock_bh(&rx->recvmsg_lock);
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if (put)
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rxrpc_put_call(call, rxrpc_call_put);
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write_lock(&rx->call_lock);
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if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
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rb_erase(&call->sock_node, &rx->calls);
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memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
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rxrpc_put_call(call, rxrpc_call_put_userid);
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}
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list_del(&call->sock_link);
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write_unlock(&rx->call_lock);
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_debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
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if (conn)
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rxrpc_disconnect_call(call);
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for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
|
|
rxrpc_free_skb(call->rxtx_buffer[i],
|
|
(call->tx_phase ? rxrpc_skb_tx_cleaned :
|
|
rxrpc_skb_rx_cleaned));
|
|
call->rxtx_buffer[i] = NULL;
|
|
}
|
|
|
|
_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_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET);
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
}
|
|
|
|
while (!list_empty(&rx->sock_calls)) {
|
|
call = list_entry(rx->sock_calls.next,
|
|
struct rxrpc_call, sock_link);
|
|
rxrpc_get_call(call, rxrpc_call_got);
|
|
rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET);
|
|
rxrpc_send_abort_packet(call);
|
|
rxrpc_release_call(rx, call);
|
|
rxrpc_put_call(call, rxrpc_call_put);
|
|
}
|
|
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* release a call
|
|
*/
|
|
void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
|
|
{
|
|
const void *here = __builtin_return_address(0);
|
|
int n;
|
|
|
|
ASSERT(call != NULL);
|
|
|
|
n = atomic_dec_return(&call->usage);
|
|
trace_rxrpc_call(call, op, n, here, NULL);
|
|
ASSERTCMP(n, >=, 0);
|
|
if (n == 0) {
|
|
_debug("call %d dead", call->debug_id);
|
|
ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
|
|
|
|
write_lock(&rxrpc_call_lock);
|
|
list_del_init(&call->link);
|
|
write_unlock(&rxrpc_call_lock);
|
|
|
|
rxrpc_cleanup_call(call);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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_put_peer(call->peer);
|
|
kfree(call->rxtx_buffer);
|
|
kfree(call->rxtx_annotations);
|
|
kmem_cache_free(rxrpc_call_jar, call);
|
|
}
|
|
|
|
/*
|
|
* clean up a call
|
|
*/
|
|
void rxrpc_cleanup_call(struct rxrpc_call *call)
|
|
{
|
|
int i;
|
|
|
|
_net("DESTROY CALL %d", call->debug_id);
|
|
|
|
memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
|
|
|
|
del_timer_sync(&call->timer);
|
|
|
|
ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
|
|
ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
|
|
ASSERTCMP(call->conn, ==, NULL);
|
|
|
|
/* Clean up the Rx/Tx buffer */
|
|
for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++)
|
|
rxrpc_free_skb(call->rxtx_buffer[i],
|
|
(call->tx_phase ? rxrpc_skb_tx_cleaned :
|
|
rxrpc_skb_rx_cleaned));
|
|
|
|
rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned);
|
|
|
|
call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
|
|
}
|
|
|
|
/*
|
|
* Make sure that all calls are gone.
|
|
*/
|
|
void __exit rxrpc_destroy_all_calls(void)
|
|
{
|
|
struct rxrpc_call *call;
|
|
|
|
_enter("");
|
|
|
|
if (list_empty(&rxrpc_calls))
|
|
return;
|
|
|
|
write_lock(&rxrpc_call_lock);
|
|
|
|
while (!list_empty(&rxrpc_calls)) {
|
|
call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
|
|
_debug("Zapping call %p", call);
|
|
|
|
rxrpc_see_call(call);
|
|
list_del_init(&call->link);
|
|
|
|
pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
|
|
call, atomic_read(&call->usage),
|
|
rxrpc_call_states[call->state],
|
|
call->flags, call->events);
|
|
|
|
write_unlock(&rxrpc_call_lock);
|
|
cond_resched();
|
|
write_lock(&rxrpc_call_lock);
|
|
}
|
|
|
|
write_unlock(&rxrpc_call_lock);
|
|
}
|