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-rw-r--r--fs/afs/rxrpc.c945
1 files changed, 945 insertions, 0 deletions
diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
new file mode 100644
index 0000000000..d642d06a45
--- /dev/null
+++ b/fs/afs/rxrpc.c
@@ -0,0 +1,945 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Maintain an RxRPC server socket to do AFS communications through
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/slab.h>
+#include <linux/sched/signal.h>
+
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "internal.h"
+#include "afs_cm.h"
+#include "protocol_yfs.h"
+#define RXRPC_TRACE_ONLY_DEFINE_ENUMS
+#include <trace/events/rxrpc.h>
+
+struct workqueue_struct *afs_async_calls;
+
+static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
+static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
+static void afs_process_async_call(struct work_struct *);
+static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
+static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);
+static int afs_deliver_cm_op_id(struct afs_call *);
+
+/* asynchronous incoming call initial processing */
+static const struct afs_call_type afs_RXCMxxxx = {
+ .name = "CB.xxxx",
+ .deliver = afs_deliver_cm_op_id,
+};
+
+/*
+ * open an RxRPC socket and bind it to be a server for callback notifications
+ * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
+ */
+int afs_open_socket(struct afs_net *net)
+{
+ struct sockaddr_rxrpc srx;
+ struct socket *socket;
+ int ret;
+
+ _enter("");
+
+ ret = sock_create_kern(net->net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket);
+ if (ret < 0)
+ goto error_1;
+
+ socket->sk->sk_allocation = GFP_NOFS;
+
+ /* bind the callback manager's address to make this a server socket */
+ memset(&srx, 0, sizeof(srx));
+ srx.srx_family = AF_RXRPC;
+ srx.srx_service = CM_SERVICE;
+ srx.transport_type = SOCK_DGRAM;
+ srx.transport_len = sizeof(srx.transport.sin6);
+ srx.transport.sin6.sin6_family = AF_INET6;
+ srx.transport.sin6.sin6_port = htons(AFS_CM_PORT);
+
+ ret = rxrpc_sock_set_min_security_level(socket->sk,
+ RXRPC_SECURITY_ENCRYPT);
+ if (ret < 0)
+ goto error_2;
+
+ ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
+ if (ret == -EADDRINUSE) {
+ srx.transport.sin6.sin6_port = 0;
+ ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
+ }
+ if (ret < 0)
+ goto error_2;
+
+ srx.srx_service = YFS_CM_SERVICE;
+ ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
+ if (ret < 0)
+ goto error_2;
+
+ /* Ideally, we'd turn on service upgrade here, but we can't because
+ * OpenAFS is buggy and leaks the userStatus field from packet to
+ * packet and between FS packets and CB packets - so if we try to do an
+ * upgrade on an FS packet, OpenAFS will leak that into the CB packet
+ * it sends back to us.
+ */
+
+ rxrpc_kernel_new_call_notification(socket, afs_rx_new_call,
+ afs_rx_discard_new_call);
+
+ ret = kernel_listen(socket, INT_MAX);
+ if (ret < 0)
+ goto error_2;
+
+ net->socket = socket;
+ afs_charge_preallocation(&net->charge_preallocation_work);
+ _leave(" = 0");
+ return 0;
+
+error_2:
+ sock_release(socket);
+error_1:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * close the RxRPC socket AFS was using
+ */
+void afs_close_socket(struct afs_net *net)
+{
+ _enter("");
+
+ kernel_listen(net->socket, 0);
+ flush_workqueue(afs_async_calls);
+
+ if (net->spare_incoming_call) {
+ afs_put_call(net->spare_incoming_call);
+ net->spare_incoming_call = NULL;
+ }
+
+ _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls));
+ wait_var_event(&net->nr_outstanding_calls,
+ !atomic_read(&net->nr_outstanding_calls));
+ _debug("no outstanding calls");
+
+ kernel_sock_shutdown(net->socket, SHUT_RDWR);
+ flush_workqueue(afs_async_calls);
+ sock_release(net->socket);
+
+ _debug("dework");
+ _leave("");
+}
+
+/*
+ * Allocate a call.
+ */
+static struct afs_call *afs_alloc_call(struct afs_net *net,
+ const struct afs_call_type *type,
+ gfp_t gfp)
+{
+ struct afs_call *call;
+ int o;
+
+ call = kzalloc(sizeof(*call), gfp);
+ if (!call)
+ return NULL;
+
+ call->type = type;
+ call->net = net;
+ call->debug_id = atomic_inc_return(&rxrpc_debug_id);
+ refcount_set(&call->ref, 1);
+ INIT_WORK(&call->async_work, afs_process_async_call);
+ init_waitqueue_head(&call->waitq);
+ spin_lock_init(&call->state_lock);
+ call->iter = &call->def_iter;
+
+ o = atomic_inc_return(&net->nr_outstanding_calls);
+ trace_afs_call(call->debug_id, afs_call_trace_alloc, 1, o,
+ __builtin_return_address(0));
+ return call;
+}
+
+/*
+ * Dispose of a reference on a call.
+ */
+void afs_put_call(struct afs_call *call)
+{
+ struct afs_net *net = call->net;
+ unsigned int debug_id = call->debug_id;
+ bool zero;
+ int r, o;
+
+ zero = __refcount_dec_and_test(&call->ref, &r);
+ o = atomic_read(&net->nr_outstanding_calls);
+ trace_afs_call(debug_id, afs_call_trace_put, r - 1, o,
+ __builtin_return_address(0));
+
+ if (zero) {
+ ASSERT(!work_pending(&call->async_work));
+ ASSERT(call->type->name != NULL);
+
+ if (call->rxcall) {
+ rxrpc_kernel_shutdown_call(net->socket, call->rxcall);
+ rxrpc_kernel_put_call(net->socket, call->rxcall);
+ call->rxcall = NULL;
+ }
+ if (call->type->destructor)
+ call->type->destructor(call);
+
+ afs_unuse_server_notime(call->net, call->server, afs_server_trace_put_call);
+ afs_put_addrlist(call->alist);
+ kfree(call->request);
+
+ trace_afs_call(call->debug_id, afs_call_trace_free, 0, o,
+ __builtin_return_address(0));
+ kfree(call);
+
+ o = atomic_dec_return(&net->nr_outstanding_calls);
+ if (o == 0)
+ wake_up_var(&net->nr_outstanding_calls);
+ }
+}
+
+static struct afs_call *afs_get_call(struct afs_call *call,
+ enum afs_call_trace why)
+{
+ int r;
+
+ __refcount_inc(&call->ref, &r);
+
+ trace_afs_call(call->debug_id, why, r + 1,
+ atomic_read(&call->net->nr_outstanding_calls),
+ __builtin_return_address(0));
+ return call;
+}
+
+/*
+ * Queue the call for actual work.
+ */
+static void afs_queue_call_work(struct afs_call *call)
+{
+ if (call->type->work) {
+ INIT_WORK(&call->work, call->type->work);
+
+ afs_get_call(call, afs_call_trace_work);
+ if (!queue_work(afs_wq, &call->work))
+ afs_put_call(call);
+ }
+}
+
+/*
+ * allocate a call with flat request and reply buffers
+ */
+struct afs_call *afs_alloc_flat_call(struct afs_net *net,
+ const struct afs_call_type *type,
+ size_t request_size, size_t reply_max)
+{
+ struct afs_call *call;
+
+ call = afs_alloc_call(net, type, GFP_NOFS);
+ if (!call)
+ goto nomem_call;
+
+ if (request_size) {
+ call->request_size = request_size;
+ call->request = kmalloc(request_size, GFP_NOFS);
+ if (!call->request)
+ goto nomem_free;
+ }
+
+ if (reply_max) {
+ call->reply_max = reply_max;
+ call->buffer = kmalloc(reply_max, GFP_NOFS);
+ if (!call->buffer)
+ goto nomem_free;
+ }
+
+ afs_extract_to_buf(call, call->reply_max);
+ call->operation_ID = type->op;
+ init_waitqueue_head(&call->waitq);
+ return call;
+
+nomem_free:
+ afs_put_call(call);
+nomem_call:
+ return NULL;
+}
+
+/*
+ * clean up a call with flat buffer
+ */
+void afs_flat_call_destructor(struct afs_call *call)
+{
+ _enter("");
+
+ kfree(call->request);
+ call->request = NULL;
+ kfree(call->buffer);
+ call->buffer = NULL;
+}
+
+/*
+ * Advance the AFS call state when the RxRPC call ends the transmit phase.
+ */
+static void afs_notify_end_request_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_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY);
+}
+
+/*
+ * Initiate a call and synchronously queue up the parameters for dispatch. Any
+ * error is stored into the call struct, which the caller must check for.
+ */
+void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp)
+{
+ struct sockaddr_rxrpc *srx = &ac->alist->addrs[ac->index];
+ struct rxrpc_call *rxcall;
+ struct msghdr msg;
+ struct kvec iov[1];
+ size_t len;
+ s64 tx_total_len;
+ int ret;
+
+ _enter(",{%pISp},", &srx->transport);
+
+ ASSERT(call->type != NULL);
+ ASSERT(call->type->name != NULL);
+
+ _debug("____MAKE %p{%s,%x} [%d]____",
+ call, call->type->name, key_serial(call->key),
+ atomic_read(&call->net->nr_outstanding_calls));
+
+ call->addr_ix = ac->index;
+ call->alist = afs_get_addrlist(ac->alist);
+
+ /* Work out the length we're going to transmit. This is awkward for
+ * calls such as FS.StoreData where there's an extra injection of data
+ * after the initial fixed part.
+ */
+ tx_total_len = call->request_size;
+ if (call->write_iter)
+ tx_total_len += iov_iter_count(call->write_iter);
+
+ /* If the call is going to be asynchronous, we need an extra ref for
+ * the call to hold itself so the caller need not hang on to its ref.
+ */
+ if (call->async) {
+ afs_get_call(call, afs_call_trace_get);
+ call->drop_ref = true;
+ }
+
+ /* create a call */
+ rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key,
+ (unsigned long)call,
+ tx_total_len,
+ call->max_lifespan,
+ gfp,
+ (call->async ?
+ afs_wake_up_async_call :
+ afs_wake_up_call_waiter),
+ call->upgrade,
+ (call->intr ? RXRPC_PREINTERRUPTIBLE :
+ RXRPC_UNINTERRUPTIBLE),
+ call->debug_id);
+ if (IS_ERR(rxcall)) {
+ ret = PTR_ERR(rxcall);
+ call->error = ret;
+ goto error_kill_call;
+ }
+
+ call->rxcall = rxcall;
+ call->issue_time = ktime_get_real();
+
+ /* send the request */
+ iov[0].iov_base = call->request;
+ iov[0].iov_len = call->request_size;
+
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, call->request_size);
+ msg.msg_control = NULL;
+ msg.msg_controllen = 0;
+ msg.msg_flags = MSG_WAITALL | (call->write_iter ? MSG_MORE : 0);
+
+ ret = rxrpc_kernel_send_data(call->net->socket, rxcall,
+ &msg, call->request_size,
+ afs_notify_end_request_tx);
+ if (ret < 0)
+ goto error_do_abort;
+
+ if (call->write_iter) {
+ msg.msg_iter = *call->write_iter;
+ msg.msg_flags &= ~MSG_MORE;
+ trace_afs_send_data(call, &msg);
+
+ ret = rxrpc_kernel_send_data(call->net->socket,
+ call->rxcall, &msg,
+ iov_iter_count(&msg.msg_iter),
+ afs_notify_end_request_tx);
+ *call->write_iter = msg.msg_iter;
+
+ trace_afs_sent_data(call, &msg, ret);
+ if (ret < 0)
+ goto error_do_abort;
+ }
+
+ /* Note that at this point, we may have received the reply or an abort
+ * - and an asynchronous call may already have completed.
+ *
+ * afs_wait_for_call_to_complete(call, ac)
+ * must be called to synchronously clean up.
+ */
+ return;
+
+error_do_abort:
+ if (ret != -ECONNABORTED) {
+ rxrpc_kernel_abort_call(call->net->socket, rxcall,
+ RX_USER_ABORT, ret,
+ afs_abort_send_data_error);
+ } else {
+ len = 0;
+ iov_iter_kvec(&msg.msg_iter, ITER_DEST, NULL, 0, 0);
+ rxrpc_kernel_recv_data(call->net->socket, rxcall,
+ &msg.msg_iter, &len, false,
+ &call->abort_code, &call->service_id);
+ ac->abort_code = call->abort_code;
+ ac->responded = true;
+ }
+ call->error = ret;
+ trace_afs_call_done(call);
+error_kill_call:
+ if (call->type->done)
+ 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_set_call_complete(call, ret, 0);
+ }
+
+ 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;
+}