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![David Howells](/assets/img/avatar_default.png)
afs_make_call() calls rxrpc_kernel_begin_call() to begin a call (which may
get stalled in the background waiting for a connection to become
available); it then calls rxrpc_kernel_set_max_life() to set the timeouts -
but that starts the call timer so the call timer might then expire before
we get a connection assigned - leading to the following oops if the call
stalled:
BUG: kernel NULL pointer dereference, address: 0000000000000000
...
CPU: 1 PID: 5111 Comm: krxrpcio/0 Not tainted 6.3.0-rc7-build3+ #701
RIP: 0010:rxrpc_alloc_txbuf+0xc0/0x157
...
Call Trace:
<TASK>
rxrpc_send_ACK+0x50/0x13b
rxrpc_input_call_event+0x16a/0x67d
rxrpc_io_thread+0x1b6/0x45f
? _raw_spin_unlock_irqrestore+0x1f/0x35
? rxrpc_input_packet+0x519/0x519
kthread+0xe7/0xef
? kthread_complete_and_exit+0x1b/0x1b
ret_from_fork+0x22/0x30
Fix this by noting the timeouts in struct rxrpc_call when the call is
created. The timer will be started when the first packet is transmitted.
It shouldn't be possible to trigger this directly from userspace through
AF_RXRPC as sendmsg() will return EBUSY if the call is in the
waiting-for-conn state if it dropped out of the wait due to a signal.
Fixes: 9d35d880e0
("rxrpc: Move client call connection to the I/O thread")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
cc: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
945 lines
23 KiB
C
945 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Maintain an RxRPC server socket to do AFS communications through
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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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#include <linux/slab.h>
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#include <linux/sched/signal.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include "internal.h"
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#include "afs_cm.h"
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#include "protocol_yfs.h"
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#define RXRPC_TRACE_ONLY_DEFINE_ENUMS
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#include <trace/events/rxrpc.h>
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struct workqueue_struct *afs_async_calls;
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static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
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static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
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static void afs_process_async_call(struct work_struct *);
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static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
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static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);
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static int afs_deliver_cm_op_id(struct afs_call *);
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/* asynchronous incoming call initial processing */
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static const struct afs_call_type afs_RXCMxxxx = {
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.name = "CB.xxxx",
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.deliver = afs_deliver_cm_op_id,
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};
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/*
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* open an RxRPC socket and bind it to be a server for callback notifications
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* - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
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*/
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int afs_open_socket(struct afs_net *net)
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{
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struct sockaddr_rxrpc srx;
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struct socket *socket;
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int ret;
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_enter("");
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ret = sock_create_kern(net->net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket);
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if (ret < 0)
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goto error_1;
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socket->sk->sk_allocation = GFP_NOFS;
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/* bind the callback manager's address to make this a server socket */
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memset(&srx, 0, sizeof(srx));
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srx.srx_family = AF_RXRPC;
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srx.srx_service = CM_SERVICE;
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srx.transport_type = SOCK_DGRAM;
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srx.transport_len = sizeof(srx.transport.sin6);
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srx.transport.sin6.sin6_family = AF_INET6;
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srx.transport.sin6.sin6_port = htons(AFS_CM_PORT);
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ret = rxrpc_sock_set_min_security_level(socket->sk,
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RXRPC_SECURITY_ENCRYPT);
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if (ret < 0)
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goto error_2;
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ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
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if (ret == -EADDRINUSE) {
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srx.transport.sin6.sin6_port = 0;
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ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
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}
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if (ret < 0)
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goto error_2;
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srx.srx_service = YFS_CM_SERVICE;
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ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
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if (ret < 0)
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goto error_2;
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/* Ideally, we'd turn on service upgrade here, but we can't because
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* OpenAFS is buggy and leaks the userStatus field from packet to
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* packet and between FS packets and CB packets - so if we try to do an
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* upgrade on an FS packet, OpenAFS will leak that into the CB packet
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* it sends back to us.
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*/
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rxrpc_kernel_new_call_notification(socket, afs_rx_new_call,
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afs_rx_discard_new_call);
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ret = kernel_listen(socket, INT_MAX);
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if (ret < 0)
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goto error_2;
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net->socket = socket;
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afs_charge_preallocation(&net->charge_preallocation_work);
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_leave(" = 0");
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return 0;
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error_2:
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sock_release(socket);
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error_1:
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* close the RxRPC socket AFS was using
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*/
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void afs_close_socket(struct afs_net *net)
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{
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_enter("");
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kernel_listen(net->socket, 0);
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flush_workqueue(afs_async_calls);
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if (net->spare_incoming_call) {
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afs_put_call(net->spare_incoming_call);
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net->spare_incoming_call = NULL;
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}
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_debug("outstanding %u", atomic_read(&net->nr_outstanding_calls));
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wait_var_event(&net->nr_outstanding_calls,
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!atomic_read(&net->nr_outstanding_calls));
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_debug("no outstanding calls");
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kernel_sock_shutdown(net->socket, SHUT_RDWR);
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flush_workqueue(afs_async_calls);
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sock_release(net->socket);
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_debug("dework");
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_leave("");
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}
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/*
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* Allocate a call.
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*/
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static struct afs_call *afs_alloc_call(struct afs_net *net,
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const struct afs_call_type *type,
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gfp_t gfp)
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{
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struct afs_call *call;
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int o;
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call = kzalloc(sizeof(*call), gfp);
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if (!call)
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return NULL;
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call->type = type;
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call->net = net;
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call->debug_id = atomic_inc_return(&rxrpc_debug_id);
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refcount_set(&call->ref, 1);
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INIT_WORK(&call->async_work, afs_process_async_call);
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init_waitqueue_head(&call->waitq);
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spin_lock_init(&call->state_lock);
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call->iter = &call->def_iter;
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o = atomic_inc_return(&net->nr_outstanding_calls);
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trace_afs_call(call->debug_id, afs_call_trace_alloc, 1, o,
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__builtin_return_address(0));
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return call;
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}
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/*
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* Dispose of a reference on a call.
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*/
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void afs_put_call(struct afs_call *call)
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{
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struct afs_net *net = call->net;
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unsigned int debug_id = call->debug_id;
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bool zero;
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int r, o;
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zero = __refcount_dec_and_test(&call->ref, &r);
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o = atomic_read(&net->nr_outstanding_calls);
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trace_afs_call(debug_id, afs_call_trace_put, r - 1, o,
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__builtin_return_address(0));
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if (zero) {
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ASSERT(!work_pending(&call->async_work));
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ASSERT(call->type->name != NULL);
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if (call->rxcall) {
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rxrpc_kernel_shutdown_call(net->socket, call->rxcall);
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rxrpc_kernel_put_call(net->socket, call->rxcall);
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call->rxcall = NULL;
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}
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if (call->type->destructor)
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call->type->destructor(call);
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afs_unuse_server_notime(call->net, call->server, afs_server_trace_put_call);
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afs_put_addrlist(call->alist);
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kfree(call->request);
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trace_afs_call(call->debug_id, afs_call_trace_free, 0, o,
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__builtin_return_address(0));
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kfree(call);
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o = atomic_dec_return(&net->nr_outstanding_calls);
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if (o == 0)
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wake_up_var(&net->nr_outstanding_calls);
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}
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}
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static struct afs_call *afs_get_call(struct afs_call *call,
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enum afs_call_trace why)
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{
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int r;
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__refcount_inc(&call->ref, &r);
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trace_afs_call(call->debug_id, why, r + 1,
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atomic_read(&call->net->nr_outstanding_calls),
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__builtin_return_address(0));
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return call;
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}
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/*
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* Queue the call for actual work.
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*/
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static void afs_queue_call_work(struct afs_call *call)
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{
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if (call->type->work) {
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INIT_WORK(&call->work, call->type->work);
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afs_get_call(call, afs_call_trace_work);
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if (!queue_work(afs_wq, &call->work))
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afs_put_call(call);
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}
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}
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/*
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* allocate a call with flat request and reply buffers
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*/
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struct afs_call *afs_alloc_flat_call(struct afs_net *net,
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const struct afs_call_type *type,
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size_t request_size, size_t reply_max)
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{
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struct afs_call *call;
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call = afs_alloc_call(net, type, GFP_NOFS);
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if (!call)
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goto nomem_call;
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if (request_size) {
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call->request_size = request_size;
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call->request = kmalloc(request_size, GFP_NOFS);
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if (!call->request)
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goto nomem_free;
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}
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if (reply_max) {
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call->reply_max = reply_max;
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call->buffer = kmalloc(reply_max, GFP_NOFS);
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if (!call->buffer)
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goto nomem_free;
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}
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afs_extract_to_buf(call, call->reply_max);
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call->operation_ID = type->op;
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init_waitqueue_head(&call->waitq);
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return call;
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nomem_free:
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afs_put_call(call);
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nomem_call:
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return NULL;
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}
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/*
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* clean up a call with flat buffer
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*/
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void afs_flat_call_destructor(struct afs_call *call)
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{
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_enter("");
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kfree(call->request);
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call->request = NULL;
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kfree(call->buffer);
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call->buffer = NULL;
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}
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/*
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* Advance the AFS call state when the RxRPC call ends the transmit phase.
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*/
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static void afs_notify_end_request_tx(struct sock *sock,
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struct rxrpc_call *rxcall,
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unsigned long call_user_ID)
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{
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struct afs_call *call = (struct afs_call *)call_user_ID;
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afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY);
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}
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/*
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* Initiate a call and synchronously queue up the parameters for dispatch. Any
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* error is stored into the call struct, which the caller must check for.
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*/
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void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp)
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{
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struct sockaddr_rxrpc *srx = &ac->alist->addrs[ac->index];
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struct rxrpc_call *rxcall;
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struct msghdr msg;
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struct kvec iov[1];
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size_t len;
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s64 tx_total_len;
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int ret;
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_enter(",{%pISp},", &srx->transport);
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ASSERT(call->type != NULL);
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ASSERT(call->type->name != NULL);
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_debug("____MAKE %p{%s,%x} [%d]____",
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call, call->type->name, key_serial(call->key),
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atomic_read(&call->net->nr_outstanding_calls));
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call->addr_ix = ac->index;
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call->alist = afs_get_addrlist(ac->alist);
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/* Work out the length we're going to transmit. This is awkward for
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* calls such as FS.StoreData where there's an extra injection of data
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* after the initial fixed part.
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*/
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tx_total_len = call->request_size;
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if (call->write_iter)
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tx_total_len += iov_iter_count(call->write_iter);
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/* If the call is going to be asynchronous, we need an extra ref for
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* the call to hold itself so the caller need not hang on to its ref.
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*/
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if (call->async) {
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afs_get_call(call, afs_call_trace_get);
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call->drop_ref = true;
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}
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/* create a call */
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rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key,
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(unsigned long)call,
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tx_total_len,
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call->max_lifespan,
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gfp,
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(call->async ?
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afs_wake_up_async_call :
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afs_wake_up_call_waiter),
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call->upgrade,
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(call->intr ? RXRPC_PREINTERRUPTIBLE :
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RXRPC_UNINTERRUPTIBLE),
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call->debug_id);
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if (IS_ERR(rxcall)) {
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ret = PTR_ERR(rxcall);
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call->error = ret;
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goto error_kill_call;
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}
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call->rxcall = rxcall;
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call->issue_time = ktime_get_real();
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/* send the request */
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iov[0].iov_base = call->request;
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iov[0].iov_len = call->request_size;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, call->request_size);
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = MSG_WAITALL | (call->write_iter ? MSG_MORE : 0);
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ret = rxrpc_kernel_send_data(call->net->socket, rxcall,
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&msg, call->request_size,
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afs_notify_end_request_tx);
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if (ret < 0)
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goto error_do_abort;
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if (call->write_iter) {
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msg.msg_iter = *call->write_iter;
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msg.msg_flags &= ~MSG_MORE;
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trace_afs_send_data(call, &msg);
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ret = rxrpc_kernel_send_data(call->net->socket,
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call->rxcall, &msg,
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iov_iter_count(&msg.msg_iter),
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afs_notify_end_request_tx);
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*call->write_iter = msg.msg_iter;
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trace_afs_sent_data(call, &msg, ret);
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if (ret < 0)
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goto error_do_abort;
|
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}
|
|
|
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/* Note that at this point, we may have received the reply or an abort
|
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* - and an asynchronous call may already have completed.
|
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*
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* afs_wait_for_call_to_complete(call, ac)
|
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* must be called to synchronously clean up.
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*/
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return;
|
|
|
|
error_do_abort:
|
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if (ret != -ECONNABORTED) {
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rxrpc_kernel_abort_call(call->net->socket, rxcall,
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RX_USER_ABORT, ret,
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afs_abort_send_data_error);
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} else {
|
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len = 0;
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iov_iter_kvec(&msg.msg_iter, ITER_DEST, NULL, 0, 0);
|
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rxrpc_kernel_recv_data(call->net->socket, rxcall,
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&msg.msg_iter, &len, false,
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&call->abort_code, &call->service_id);
|
|
ac->abort_code = call->abort_code;
|
|
ac->responded = true;
|
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}
|
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call->error = ret;
|
|
trace_afs_call_done(call);
|
|
error_kill_call:
|
|
if (call->type->done)
|
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call->type->done(call);
|
|
|
|
/* We need to dispose of the extra ref we grabbed for an async call.
|
|
* The call, however, might be queued on afs_async_calls and we need to
|
|
* make sure we don't get any more notifications that might requeue it.
|
|
*/
|
|
if (call->rxcall)
|
|
rxrpc_kernel_shutdown_call(call->net->socket, call->rxcall);
|
|
if (call->async) {
|
|
if (cancel_work_sync(&call->async_work))
|
|
afs_put_call(call);
|
|
afs_put_call(call);
|
|
}
|
|
|
|
ac->error = ret;
|
|
call->state = AFS_CALL_COMPLETE;
|
|
_leave(" = %d", ret);
|
|
}
|
|
|
|
/*
|
|
* Log remote abort codes that indicate that we have a protocol disagreement
|
|
* with the server.
|
|
*/
|
|
static void afs_log_error(struct afs_call *call, s32 remote_abort)
|
|
{
|
|
static int max = 0;
|
|
const char *msg;
|
|
int m;
|
|
|
|
switch (remote_abort) {
|
|
case RX_EOF: msg = "unexpected EOF"; break;
|
|
case RXGEN_CC_MARSHAL: msg = "client marshalling"; break;
|
|
case RXGEN_CC_UNMARSHAL: msg = "client unmarshalling"; break;
|
|
case RXGEN_SS_MARSHAL: msg = "server marshalling"; break;
|
|
case RXGEN_SS_UNMARSHAL: msg = "server unmarshalling"; break;
|
|
case RXGEN_DECODE: msg = "opcode decode"; break;
|
|
case RXGEN_SS_XDRFREE: msg = "server XDR cleanup"; break;
|
|
case RXGEN_CC_XDRFREE: msg = "client XDR cleanup"; break;
|
|
case -32: msg = "insufficient data"; break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
m = max;
|
|
if (m < 3) {
|
|
max = m + 1;
|
|
pr_notice("kAFS: Peer reported %s failure on %s [%pISp]\n",
|
|
msg, call->type->name,
|
|
&call->alist->addrs[call->addr_ix].transport);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* deliver messages to a call
|
|
*/
|
|
static void afs_deliver_to_call(struct afs_call *call)
|
|
{
|
|
enum afs_call_state state;
|
|
size_t len;
|
|
u32 abort_code, remote_abort = 0;
|
|
int ret;
|
|
|
|
_enter("%s", call->type->name);
|
|
|
|
while (state = READ_ONCE(call->state),
|
|
state == AFS_CALL_CL_AWAIT_REPLY ||
|
|
state == AFS_CALL_SV_AWAIT_OP_ID ||
|
|
state == AFS_CALL_SV_AWAIT_REQUEST ||
|
|
state == AFS_CALL_SV_AWAIT_ACK
|
|
) {
|
|
if (state == AFS_CALL_SV_AWAIT_ACK) {
|
|
len = 0;
|
|
iov_iter_kvec(&call->def_iter, ITER_DEST, NULL, 0, 0);
|
|
ret = rxrpc_kernel_recv_data(call->net->socket,
|
|
call->rxcall, &call->def_iter,
|
|
&len, false, &remote_abort,
|
|
&call->service_id);
|
|
trace_afs_receive_data(call, &call->def_iter, false, ret);
|
|
|
|
if (ret == -EINPROGRESS || ret == -EAGAIN)
|
|
return;
|
|
if (ret < 0 || ret == 1) {
|
|
if (ret == 1)
|
|
ret = 0;
|
|
goto call_complete;
|
|
}
|
|
return;
|
|
}
|
|
|
|
ret = call->type->deliver(call);
|
|
state = READ_ONCE(call->state);
|
|
if (ret == 0 && call->unmarshalling_error)
|
|
ret = -EBADMSG;
|
|
switch (ret) {
|
|
case 0:
|
|
afs_queue_call_work(call);
|
|
if (state == AFS_CALL_CL_PROC_REPLY) {
|
|
if (call->op)
|
|
set_bit(AFS_SERVER_FL_MAY_HAVE_CB,
|
|
&call->op->server->flags);
|
|
goto call_complete;
|
|
}
|
|
ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY);
|
|
goto done;
|
|
case -EINPROGRESS:
|
|
case -EAGAIN:
|
|
goto out;
|
|
case -ECONNABORTED:
|
|
ASSERTCMP(state, ==, AFS_CALL_COMPLETE);
|
|
afs_log_error(call, call->abort_code);
|
|
goto done;
|
|
case -ENOTSUPP:
|
|
abort_code = RXGEN_OPCODE;
|
|
rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
|
|
abort_code, ret,
|
|
afs_abort_op_not_supported);
|
|
goto local_abort;
|
|
case -EIO:
|
|
pr_err("kAFS: Call %u in bad state %u\n",
|
|
call->debug_id, state);
|
|
fallthrough;
|
|
case -ENODATA:
|
|
case -EBADMSG:
|
|
case -EMSGSIZE:
|
|
case -ENOMEM:
|
|
case -EFAULT:
|
|
abort_code = RXGEN_CC_UNMARSHAL;
|
|
if (state != AFS_CALL_CL_AWAIT_REPLY)
|
|
abort_code = RXGEN_SS_UNMARSHAL;
|
|
rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
|
|
abort_code, ret,
|
|
afs_abort_unmarshal_error);
|
|
goto local_abort;
|
|
default:
|
|
abort_code = RX_CALL_DEAD;
|
|
rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
|
|
abort_code, ret,
|
|
afs_abort_general_error);
|
|
goto local_abort;
|
|
}
|
|
}
|
|
|
|
done:
|
|
if (call->type->done)
|
|
call->type->done(call);
|
|
out:
|
|
_leave("");
|
|
return;
|
|
|
|
local_abort:
|
|
abort_code = 0;
|
|
call_complete:
|
|
afs_set_call_complete(call, ret, remote_abort);
|
|
state = AFS_CALL_COMPLETE;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Wait synchronously for a call to complete and clean up the call struct.
|
|
*/
|
|
long afs_wait_for_call_to_complete(struct afs_call *call,
|
|
struct afs_addr_cursor *ac)
|
|
{
|
|
long ret;
|
|
bool rxrpc_complete = false;
|
|
|
|
DECLARE_WAITQUEUE(myself, current);
|
|
|
|
_enter("");
|
|
|
|
ret = call->error;
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
add_wait_queue(&call->waitq, &myself);
|
|
for (;;) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
|
|
/* deliver any messages that are in the queue */
|
|
if (!afs_check_call_state(call, AFS_CALL_COMPLETE) &&
|
|
call->need_attention) {
|
|
call->need_attention = false;
|
|
__set_current_state(TASK_RUNNING);
|
|
afs_deliver_to_call(call);
|
|
continue;
|
|
}
|
|
|
|
if (afs_check_call_state(call, AFS_CALL_COMPLETE))
|
|
break;
|
|
|
|
if (!rxrpc_kernel_check_life(call->net->socket, call->rxcall)) {
|
|
/* rxrpc terminated the call. */
|
|
rxrpc_complete = true;
|
|
break;
|
|
}
|
|
|
|
schedule();
|
|
}
|
|
|
|
remove_wait_queue(&call->waitq, &myself);
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {
|
|
if (rxrpc_complete) {
|
|
afs_set_call_complete(call, call->error, call->abort_code);
|
|
} else {
|
|
/* Kill off the call if it's still live. */
|
|
_debug("call interrupted");
|
|
if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
|
|
RX_USER_ABORT, -EINTR,
|
|
afs_abort_interrupted))
|
|
afs_set_call_complete(call, -EINTR, 0);
|
|
}
|
|
}
|
|
|
|
spin_lock_bh(&call->state_lock);
|
|
ac->abort_code = call->abort_code;
|
|
ac->error = call->error;
|
|
spin_unlock_bh(&call->state_lock);
|
|
|
|
ret = ac->error;
|
|
switch (ret) {
|
|
case 0:
|
|
ret = call->ret0;
|
|
call->ret0 = 0;
|
|
|
|
fallthrough;
|
|
case -ECONNABORTED:
|
|
ac->responded = true;
|
|
break;
|
|
}
|
|
|
|
out:
|
|
_debug("call complete");
|
|
afs_put_call(call);
|
|
_leave(" = %p", (void *)ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* wake up a waiting call
|
|
*/
|
|
static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall,
|
|
unsigned long call_user_ID)
|
|
{
|
|
struct afs_call *call = (struct afs_call *)call_user_ID;
|
|
|
|
call->need_attention = true;
|
|
wake_up(&call->waitq);
|
|
}
|
|
|
|
/*
|
|
* wake up an asynchronous call
|
|
*/
|
|
static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,
|
|
unsigned long call_user_ID)
|
|
{
|
|
struct afs_call *call = (struct afs_call *)call_user_ID;
|
|
int r;
|
|
|
|
trace_afs_notify_call(rxcall, call);
|
|
call->need_attention = true;
|
|
|
|
if (__refcount_inc_not_zero(&call->ref, &r)) {
|
|
trace_afs_call(call->debug_id, afs_call_trace_wake, r + 1,
|
|
atomic_read(&call->net->nr_outstanding_calls),
|
|
__builtin_return_address(0));
|
|
|
|
if (!queue_work(afs_async_calls, &call->async_work))
|
|
afs_put_call(call);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Perform I/O processing on an asynchronous call. The work item carries a ref
|
|
* to the call struct that we either need to release or to pass on.
|
|
*/
|
|
static void afs_process_async_call(struct work_struct *work)
|
|
{
|
|
struct afs_call *call = container_of(work, struct afs_call, async_work);
|
|
|
|
_enter("");
|
|
|
|
if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
|
|
call->need_attention = false;
|
|
afs_deliver_to_call(call);
|
|
}
|
|
|
|
afs_put_call(call);
|
|
_leave("");
|
|
}
|
|
|
|
static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)
|
|
{
|
|
struct afs_call *call = (struct afs_call *)user_call_ID;
|
|
|
|
call->rxcall = rxcall;
|
|
}
|
|
|
|
/*
|
|
* Charge the incoming call preallocation.
|
|
*/
|
|
void afs_charge_preallocation(struct work_struct *work)
|
|
{
|
|
struct afs_net *net =
|
|
container_of(work, struct afs_net, charge_preallocation_work);
|
|
struct afs_call *call = net->spare_incoming_call;
|
|
|
|
for (;;) {
|
|
if (!call) {
|
|
call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL);
|
|
if (!call)
|
|
break;
|
|
|
|
call->drop_ref = true;
|
|
call->async = true;
|
|
call->state = AFS_CALL_SV_AWAIT_OP_ID;
|
|
init_waitqueue_head(&call->waitq);
|
|
afs_extract_to_tmp(call);
|
|
}
|
|
|
|
if (rxrpc_kernel_charge_accept(net->socket,
|
|
afs_wake_up_async_call,
|
|
afs_rx_attach,
|
|
(unsigned long)call,
|
|
GFP_KERNEL,
|
|
call->debug_id) < 0)
|
|
break;
|
|
call = NULL;
|
|
}
|
|
net->spare_incoming_call = call;
|
|
}
|
|
|
|
/*
|
|
* Discard a preallocated call when a socket is shut down.
|
|
*/
|
|
static void afs_rx_discard_new_call(struct rxrpc_call *rxcall,
|
|
unsigned long user_call_ID)
|
|
{
|
|
struct afs_call *call = (struct afs_call *)user_call_ID;
|
|
|
|
call->rxcall = NULL;
|
|
afs_put_call(call);
|
|
}
|
|
|
|
/*
|
|
* Notification of an incoming call.
|
|
*/
|
|
static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,
|
|
unsigned long user_call_ID)
|
|
{
|
|
struct afs_net *net = afs_sock2net(sk);
|
|
|
|
queue_work(afs_wq, &net->charge_preallocation_work);
|
|
}
|
|
|
|
/*
|
|
* Grab the operation ID from an incoming cache manager call. The socket
|
|
* buffer is discarded on error or if we don't yet have sufficient data.
|
|
*/
|
|
static int afs_deliver_cm_op_id(struct afs_call *call)
|
|
{
|
|
int ret;
|
|
|
|
_enter("{%zu}", iov_iter_count(call->iter));
|
|
|
|
/* the operation ID forms the first four bytes of the request data */
|
|
ret = afs_extract_data(call, true);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
call->operation_ID = ntohl(call->tmp);
|
|
afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST);
|
|
|
|
/* ask the cache manager to route the call (it'll change the call type
|
|
* if successful) */
|
|
if (!afs_cm_incoming_call(call))
|
|
return -ENOTSUPP;
|
|
|
|
trace_afs_cb_call(call);
|
|
|
|
/* pass responsibility for the remainer of this message off to the
|
|
* cache manager op */
|
|
return call->type->deliver(call);
|
|
}
|
|
|
|
/*
|
|
* Advance the AFS call state when an RxRPC service call ends the transmit
|
|
* phase.
|
|
*/
|
|
static void afs_notify_end_reply_tx(struct sock *sock,
|
|
struct rxrpc_call *rxcall,
|
|
unsigned long call_user_ID)
|
|
{
|
|
struct afs_call *call = (struct afs_call *)call_user_ID;
|
|
|
|
afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK);
|
|
}
|
|
|
|
/*
|
|
* send an empty reply
|
|
*/
|
|
void afs_send_empty_reply(struct afs_call *call)
|
|
{
|
|
struct afs_net *net = call->net;
|
|
struct msghdr msg;
|
|
|
|
_enter("");
|
|
|
|
rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0);
|
|
|
|
msg.msg_name = NULL;
|
|
msg.msg_namelen = 0;
|
|
iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, NULL, 0, 0);
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0,
|
|
afs_notify_end_reply_tx)) {
|
|
case 0:
|
|
_leave(" [replied]");
|
|
return;
|
|
|
|
case -ENOMEM:
|
|
_debug("oom");
|
|
rxrpc_kernel_abort_call(net->socket, call->rxcall,
|
|
RXGEN_SS_MARSHAL, -ENOMEM,
|
|
afs_abort_oom);
|
|
fallthrough;
|
|
default:
|
|
_leave(" [error]");
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* send a simple reply
|
|
*/
|
|
void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
|
|
{
|
|
struct afs_net *net = call->net;
|
|
struct msghdr msg;
|
|
struct kvec iov[1];
|
|
int n;
|
|
|
|
_enter("");
|
|
|
|
rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len);
|
|
|
|
iov[0].iov_base = (void *) buf;
|
|
iov[0].iov_len = len;
|
|
msg.msg_name = NULL;
|
|
msg.msg_namelen = 0;
|
|
iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, len);
|
|
msg.msg_control = NULL;
|
|
msg.msg_controllen = 0;
|
|
msg.msg_flags = 0;
|
|
|
|
n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len,
|
|
afs_notify_end_reply_tx);
|
|
if (n >= 0) {
|
|
/* Success */
|
|
_leave(" [replied]");
|
|
return;
|
|
}
|
|
|
|
if (n == -ENOMEM) {
|
|
_debug("oom");
|
|
rxrpc_kernel_abort_call(net->socket, call->rxcall,
|
|
RXGEN_SS_MARSHAL, -ENOMEM,
|
|
afs_abort_oom);
|
|
}
|
|
_leave(" [error]");
|
|
}
|
|
|
|
/*
|
|
* Extract a piece of data from the received data socket buffers.
|
|
*/
|
|
int afs_extract_data(struct afs_call *call, bool want_more)
|
|
{
|
|
struct afs_net *net = call->net;
|
|
struct iov_iter *iter = call->iter;
|
|
enum afs_call_state state;
|
|
u32 remote_abort = 0;
|
|
int ret;
|
|
|
|
_enter("{%s,%zu,%zu},%d",
|
|
call->type->name, call->iov_len, iov_iter_count(iter), want_more);
|
|
|
|
ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, iter,
|
|
&call->iov_len, want_more, &remote_abort,
|
|
&call->service_id);
|
|
trace_afs_receive_data(call, call->iter, want_more, ret);
|
|
if (ret == 0 || ret == -EAGAIN)
|
|
return ret;
|
|
|
|
state = READ_ONCE(call->state);
|
|
if (ret == 1) {
|
|
switch (state) {
|
|
case AFS_CALL_CL_AWAIT_REPLY:
|
|
afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY);
|
|
break;
|
|
case AFS_CALL_SV_AWAIT_REQUEST:
|
|
afs_set_call_state(call, state, AFS_CALL_SV_REPLYING);
|
|
break;
|
|
case AFS_CALL_COMPLETE:
|
|
kdebug("prem complete %d", call->error);
|
|
return afs_io_error(call, afs_io_error_extract);
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
afs_set_call_complete(call, ret, remote_abort);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Log protocol error production.
|
|
*/
|
|
noinline int afs_protocol_error(struct afs_call *call,
|
|
enum afs_eproto_cause cause)
|
|
{
|
|
trace_afs_protocol_error(call, cause);
|
|
if (call)
|
|
call->unmarshalling_error = true;
|
|
return -EBADMSG;
|
|
}
|