Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/* AFS Cache Manager Service
 *
 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */
 
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/ip.h>
#include "internal.h"
#include "afs_cm.h"
#include "protocol_yfs.h"
 
static int afs_deliver_cb_init_call_back_state(struct afs_call *);
static int afs_deliver_cb_init_call_back_state3(struct afs_call *);
static int afs_deliver_cb_probe(struct afs_call *);
static int afs_deliver_cb_callback(struct afs_call *);
static int afs_deliver_cb_probe_uuid(struct afs_call *);
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *);
static void afs_cm_destructor(struct afs_call *);
static void SRXAFSCB_CallBack(struct work_struct *);
static void SRXAFSCB_InitCallBackState(struct work_struct *);
static void SRXAFSCB_Probe(struct work_struct *);
static void SRXAFSCB_ProbeUuid(struct work_struct *);
static void SRXAFSCB_TellMeAboutYourself(struct work_struct *);
 
static int afs_deliver_yfs_cb_callback(struct afs_call *);
 
/*
 * CB.CallBack operation type
 */
static const struct afs_call_type afs_SRXCBCallBack = {
<------>.name		= "CB.CallBack",
<------>.deliver	= afs_deliver_cb_callback,
<------>.destructor	= afs_cm_destructor,
<------>.work		= SRXAFSCB_CallBack,
};
 
/*
 * CB.InitCallBackState operation type
 */
static const struct afs_call_type afs_SRXCBInitCallBackState = {
<------>.name		= "CB.InitCallBackState",
<------>.deliver	= afs_deliver_cb_init_call_back_state,
<------>.destructor	= afs_cm_destructor,
<------>.work		= SRXAFSCB_InitCallBackState,
};
 
/*
 * CB.InitCallBackState3 operation type
 */
static const struct afs_call_type afs_SRXCBInitCallBackState3 = {
<------>.name		= "CB.InitCallBackState3",
<------>.deliver	= afs_deliver_cb_init_call_back_state3,
<------>.destructor	= afs_cm_destructor,
<------>.work		= SRXAFSCB_InitCallBackState,
};
 
/*
 * CB.Probe operation type
 */
static const struct afs_call_type afs_SRXCBProbe = {
<------>.name		= "CB.Probe",
<------>.deliver	= afs_deliver_cb_probe,
<------>.destructor	= afs_cm_destructor,
<------>.work		= SRXAFSCB_Probe,
};
 
/*
 * CB.ProbeUuid operation type
 */
static const struct afs_call_type afs_SRXCBProbeUuid = {
<------>.name		= "CB.ProbeUuid",
<------>.deliver	= afs_deliver_cb_probe_uuid,
<------>.destructor	= afs_cm_destructor,
<------>.work		= SRXAFSCB_ProbeUuid,
};
 
/*
 * CB.TellMeAboutYourself operation type
 */
static const struct afs_call_type afs_SRXCBTellMeAboutYourself = {
<------>.name		= "CB.TellMeAboutYourself",
<------>.deliver	= afs_deliver_cb_tell_me_about_yourself,
<------>.destructor	= afs_cm_destructor,
<------>.work		= SRXAFSCB_TellMeAboutYourself,
};
 
/*
 * YFS CB.CallBack operation type
 */
static const struct afs_call_type afs_SRXYFSCB_CallBack = {
<------>.name		= "YFSCB.CallBack",
<------>.deliver	= afs_deliver_yfs_cb_callback,
<------>.destructor	= afs_cm_destructor,
<------>.work		= SRXAFSCB_CallBack,
};
 
/*
 * route an incoming cache manager call
 * - return T if supported, F if not
 */
bool afs_cm_incoming_call(struct afs_call *call)
{
<------>_enter("{%u, CB.OP %u}", call->service_id, call->operation_ID);
 
<------>switch (call->operation_ID) {
<------>case CBCallBack:
<------><------>call->type = &afs_SRXCBCallBack;
<------><------>return true;
<------>case CBInitCallBackState:
<------><------>call->type = &afs_SRXCBInitCallBackState;
<------><------>return true;
<------>case CBInitCallBackState3:
<------><------>call->type = &afs_SRXCBInitCallBackState3;
<------><------>return true;
<------>case CBProbe:
<------><------>call->type = &afs_SRXCBProbe;
<------><------>return true;
<------>case CBProbeUuid:
<------><------>call->type = &afs_SRXCBProbeUuid;
<------><------>return true;
<------>case CBTellMeAboutYourself:
<------><------>call->type = &afs_SRXCBTellMeAboutYourself;
<------><------>return true;
<------>case YFSCBCallBack:
<------><------>if (call->service_id != YFS_CM_SERVICE)
<------><------><------>return false;
<------><------>call->type = &afs_SRXYFSCB_CallBack;
<------><------>return true;
<------>default:
<------><------>return false;
<------>}
}
 
/*
 * Find the server record by peer address and record a probe to the cache
 * manager from a server.
 */
static int afs_find_cm_server_by_peer(struct afs_call *call)
{
<------>struct sockaddr_rxrpc srx;
<------>struct afs_server *server;
 
<------>rxrpc_kernel_get_peer(call->net->socket, call->rxcall, &srx);
 
<------>server = afs_find_server(call->net, &srx);
<------>if (!server) {
<------><------>trace_afs_cm_no_server(call, &srx);
<------><------>return 0;
<------>}
 
<------>call->server = server;
<------>return 0;
}
 
/*
 * Find the server record by server UUID and record a probe to the cache
 * manager from a server.
 */
static int afs_find_cm_server_by_uuid(struct afs_call *call,
<------><------><------><------>      struct afs_uuid *uuid)
{
<------>struct afs_server *server;
 
<------>rcu_read_lock();
<------>server = afs_find_server_by_uuid(call->net, call->request);
<------>rcu_read_unlock();
<------>if (!server) {
<------><------>trace_afs_cm_no_server_u(call, call->request);
<------><------>return 0;
<------>}
 
<------>call->server = server;
<------>return 0;
}
 
/*
 * Clean up a cache manager call.
 */
static void afs_cm_destructor(struct afs_call *call)
{
<------>kfree(call->buffer);
<------>call->buffer = NULL;
}
 
/*
 * Abort a service call from within an action function.
 */
static void afs_abort_service_call(struct afs_call *call, u32 abort_code, int error,
<------><------><------><------>   const char *why)
{
<------>rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
<------><------><------><------>abort_code, error, why);
<------>afs_set_call_complete(call, error, 0);
}
 
/*
 * The server supplied a list of callbacks that it wanted to break.
 */
static void SRXAFSCB_CallBack(struct work_struct *work)
{
<------>struct afs_call *call = container_of(work, struct afs_call, work);
 
<------>_enter("");
 
<------>/* We need to break the callbacks before sending the reply as the
<------> * server holds up change visibility till it receives our reply so as
<------> * to maintain cache coherency.
<------> */
<------>if (call->server) {
<------><------>trace_afs_server(call->server,
<------><------><------><------> atomic_read(&call->server->ref),
<------><------><------><------> atomic_read(&call->server->active),
<------><------><------><------> afs_server_trace_callback);
<------><------>afs_break_callbacks(call->server, call->count, call->request);
<------>}
 
<------>afs_send_empty_reply(call);
<------>afs_put_call(call);
<------>_leave("");
}
 
/*
 * deliver request data to a CB.CallBack call
 */
static int afs_deliver_cb_callback(struct afs_call *call)
{
<------>struct afs_callback_break *cb;
<------>__be32 *bp;
<------>int ret, loop;
 
<------>_enter("{%u}", call->unmarshall);
 
<------>switch (call->unmarshall) {
<------>case 0:
<------><------>afs_extract_to_tmp(call);
<------><------>call->unmarshall++;
 
<------><------>/* extract the FID array and its count in two steps */
<------><------>fallthrough;
<------>case 1:
<------><------>_debug("extract FID count");
<------><------>ret = afs_extract_data(call, true);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>call->count = ntohl(call->tmp);
<------><------>_debug("FID count: %u", call->count);
<------><------>if (call->count > AFSCBMAX)
<------><------><------>return afs_protocol_error(call, afs_eproto_cb_fid_count);
 
<------><------>call->buffer = kmalloc(array3_size(call->count, 3, 4),
<------><------><------><------>       GFP_KERNEL);
<------><------>if (!call->buffer)
<------><------><------>return -ENOMEM;
<------><------>afs_extract_to_buf(call, call->count * 3 * 4);
<------><------>call->unmarshall++;
 
<------><------>fallthrough;
<------>case 2:
<------><------>_debug("extract FID array");
<------><------>ret = afs_extract_data(call, true);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>_debug("unmarshall FID array");
<------><------>call->request = kcalloc(call->count,
<------><------><------><------><------>sizeof(struct afs_callback_break),
<------><------><------><------><------>GFP_KERNEL);
<------><------>if (!call->request)
<------><------><------>return -ENOMEM;
 
<------><------>cb = call->request;
<------><------>bp = call->buffer;
<------><------>for (loop = call->count; loop > 0; loop--, cb++) {
<------><------><------>cb->fid.vid	= ntohl(*bp++);
<------><------><------>cb->fid.vnode	= ntohl(*bp++);
<------><------><------>cb->fid.unique	= ntohl(*bp++);
<------><------>}
 
<------><------>afs_extract_to_tmp(call);
<------><------>call->unmarshall++;
 
<------><------>/* extract the callback array and its count in two steps */
<------><------>fallthrough;
<------>case 3:
<------><------>_debug("extract CB count");
<------><------>ret = afs_extract_data(call, true);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>call->count2 = ntohl(call->tmp);
<------><------>_debug("CB count: %u", call->count2);
<------><------>if (call->count2 != call->count && call->count2 != 0)
<------><------><------>return afs_protocol_error(call, afs_eproto_cb_count);
<------><------>call->iter = &call->def_iter;
<------><------>iov_iter_discard(&call->def_iter, READ, call->count2 * 3 * 4);
<------><------>call->unmarshall++;
 
<------><------>fallthrough;
<------>case 4:
<------><------>_debug("extract discard %zu/%u",
<------><------>       iov_iter_count(call->iter), call->count2 * 3 * 4);
 
<------><------>ret = afs_extract_data(call, false);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>call->unmarshall++;
<------>case 5:
<------><------>break;
<------>}
 
<------>if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
<------><------>return afs_io_error(call, afs_io_error_cm_reply);
 
<------>/* we'll need the file server record as that tells us which set of
<------> * vnodes to operate upon */
<------>return afs_find_cm_server_by_peer(call);
}
 
/*
 * allow the fileserver to request callback state (re-)initialisation
 */
static void SRXAFSCB_InitCallBackState(struct work_struct *work)
{
<------>struct afs_call *call = container_of(work, struct afs_call, work);
 
<------>_enter("{%p}", call->server);
 
<------>if (call->server)
<------><------>afs_init_callback_state(call->server);
<------>afs_send_empty_reply(call);
<------>afs_put_call(call);
<------>_leave("");
}
 
/*
 * deliver request data to a CB.InitCallBackState call
 */
static int afs_deliver_cb_init_call_back_state(struct afs_call *call)
{
<------>int ret;
 
<------>_enter("");
 
<------>afs_extract_discard(call, 0);
<------>ret = afs_extract_data(call, false);
<------>if (ret < 0)
<------><------>return ret;
 
<------>/* we'll need the file server record as that tells us which set of
<------> * vnodes to operate upon */
<------>return afs_find_cm_server_by_peer(call);
}
 
/*
 * deliver request data to a CB.InitCallBackState3 call
 */
static int afs_deliver_cb_init_call_back_state3(struct afs_call *call)
{
<------>struct afs_uuid *r;
<------>unsigned loop;
<------>__be32 *b;
<------>int ret;
 
<------>_enter("");
 
<------>_enter("{%u}", call->unmarshall);
 
<------>switch (call->unmarshall) {
<------>case 0:
<------><------>call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
<------><------>if (!call->buffer)
<------><------><------>return -ENOMEM;
<------><------>afs_extract_to_buf(call, 11 * sizeof(__be32));
<------><------>call->unmarshall++;
 
<------><------>fallthrough;
<------>case 1:
<------><------>_debug("extract UUID");
<------><------>ret = afs_extract_data(call, false);
<------><------>switch (ret) {
<------><------>case 0:		break;
<------><------>case -EAGAIN:	return 0;
<------><------>default:	return ret;
<------><------>}
 
<------><------>_debug("unmarshall UUID");
<------><------>call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
<------><------>if (!call->request)
<------><------><------>return -ENOMEM;
 
<------><------>b = call->buffer;
<------><------>r = call->request;
<------><------>r->time_low			= b[0];
<------><------>r->time_mid			= htons(ntohl(b[1]));
<------><------>r->time_hi_and_version		= htons(ntohl(b[2]));
<------><------>r->clock_seq_hi_and_reserved 	= ntohl(b[3]);
<------><------>r->clock_seq_low		= ntohl(b[4]);
 
<------><------>for (loop = 0; loop < 6; loop++)
<------><------><------>r->node[loop] = ntohl(b[loop + 5]);
 
<------><------>call->unmarshall++;
 
<------>case 2:
<------><------>break;
<------>}
 
<------>if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
<------><------>return afs_io_error(call, afs_io_error_cm_reply);
 
<------>/* we'll need the file server record as that tells us which set of
<------> * vnodes to operate upon */
<------>return afs_find_cm_server_by_uuid(call, call->request);
}
 
/*
 * allow the fileserver to see if the cache manager is still alive
 */
static void SRXAFSCB_Probe(struct work_struct *work)
{
<------>struct afs_call *call = container_of(work, struct afs_call, work);
 
<------>_enter("");
<------>afs_send_empty_reply(call);
<------>afs_put_call(call);
<------>_leave("");
}
 
/*
 * deliver request data to a CB.Probe call
 */
static int afs_deliver_cb_probe(struct afs_call *call)
{
<------>int ret;
 
<------>_enter("");
 
<------>afs_extract_discard(call, 0);
<------>ret = afs_extract_data(call, false);
<------>if (ret < 0)
<------><------>return ret;
 
<------>if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
<------><------>return afs_io_error(call, afs_io_error_cm_reply);
<------>return afs_find_cm_server_by_peer(call);
}
 
/*
 * Allow the fileserver to quickly find out if the cache manager has been
 * rebooted.
 */
static void SRXAFSCB_ProbeUuid(struct work_struct *work)
{
<------>struct afs_call *call = container_of(work, struct afs_call, work);
<------>struct afs_uuid *r = call->request;
 
<------>_enter("");
 
<------>if (memcmp(r, &call->net->uuid, sizeof(call->net->uuid)) == 0)
<------><------>afs_send_empty_reply(call);
<------>else
<------><------>afs_abort_service_call(call, 1, 1, "K-1");
 
<------>afs_put_call(call);
<------>_leave("");
}
 
/*
 * deliver request data to a CB.ProbeUuid call
 */
static int afs_deliver_cb_probe_uuid(struct afs_call *call)
{
<------>struct afs_uuid *r;
<------>unsigned loop;
<------>__be32 *b;
<------>int ret;
 
<------>_enter("{%u}", call->unmarshall);
 
<------>switch (call->unmarshall) {
<------>case 0:
<------><------>call->buffer = kmalloc_array(11, sizeof(__be32), GFP_KERNEL);
<------><------>if (!call->buffer)
<------><------><------>return -ENOMEM;
<------><------>afs_extract_to_buf(call, 11 * sizeof(__be32));
<------><------>call->unmarshall++;
 
<------><------>fallthrough;
<------>case 1:
<------><------>_debug("extract UUID");
<------><------>ret = afs_extract_data(call, false);
<------><------>switch (ret) {
<------><------>case 0:		break;
<------><------>case -EAGAIN:	return 0;
<------><------>default:	return ret;
<------><------>}
 
<------><------>_debug("unmarshall UUID");
<------><------>call->request = kmalloc(sizeof(struct afs_uuid), GFP_KERNEL);
<------><------>if (!call->request)
<------><------><------>return -ENOMEM;
 
<------><------>b = call->buffer;
<------><------>r = call->request;
<------><------>r->time_low			= b[0];
<------><------>r->time_mid			= htons(ntohl(b[1]));
<------><------>r->time_hi_and_version		= htons(ntohl(b[2]));
<------><------>r->clock_seq_hi_and_reserved 	= ntohl(b[3]);
<------><------>r->clock_seq_low		= ntohl(b[4]);
 
<------><------>for (loop = 0; loop < 6; loop++)
<------><------><------>r->node[loop] = ntohl(b[loop + 5]);
 
<------><------>call->unmarshall++;
 
<------>case 2:
<------><------>break;
<------>}
 
<------>if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
<------><------>return afs_io_error(call, afs_io_error_cm_reply);
<------>return afs_find_cm_server_by_peer(call);
}
 
/*
 * allow the fileserver to ask about the cache manager's capabilities
 */
static void SRXAFSCB_TellMeAboutYourself(struct work_struct *work)
{
<------>struct afs_call *call = container_of(work, struct afs_call, work);
<------>int loop;
 
<------>struct {
<------><------>struct /* InterfaceAddr */ {
<------><------><------>__be32 nifs;
<------><------><------>__be32 uuid[11];
<------><------><------>__be32 ifaddr[32];
<------><------><------>__be32 netmask[32];
<------><------><------>__be32 mtu[32];
<------><------>} ia;
<------><------>struct /* Capabilities */ {
<------><------><------>__be32 capcount;
<------><------><------>__be32 caps[1];
<------><------>} cap;
<------>} reply;
 
<------>_enter("");
 
<------>memset(&reply, 0, sizeof(reply));
 
<------>reply.ia.uuid[0] = call->net->uuid.time_low;
<------>reply.ia.uuid[1] = htonl(ntohs(call->net->uuid.time_mid));
<------>reply.ia.uuid[2] = htonl(ntohs(call->net->uuid.time_hi_and_version));
<------>reply.ia.uuid[3] = htonl((s8) call->net->uuid.clock_seq_hi_and_reserved);
<------>reply.ia.uuid[4] = htonl((s8) call->net->uuid.clock_seq_low);
<------>for (loop = 0; loop < 6; loop++)
<------><------>reply.ia.uuid[loop + 5] = htonl((s8) call->net->uuid.node[loop]);
 
<------>reply.cap.capcount = htonl(1);
<------>reply.cap.caps[0] = htonl(AFS_CAP_ERROR_TRANSLATION);
<------>afs_send_simple_reply(call, &reply, sizeof(reply));
<------>afs_put_call(call);
<------>_leave("");
}
 
/*
 * deliver request data to a CB.TellMeAboutYourself call
 */
static int afs_deliver_cb_tell_me_about_yourself(struct afs_call *call)
{
<------>int ret;
 
<------>_enter("");
 
<------>afs_extract_discard(call, 0);
<------>ret = afs_extract_data(call, false);
<------>if (ret < 0)
<------><------>return ret;
 
<------>if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
<------><------>return afs_io_error(call, afs_io_error_cm_reply);
<------>return afs_find_cm_server_by_peer(call);
}
 
/*
 * deliver request data to a YFS CB.CallBack call
 */
static int afs_deliver_yfs_cb_callback(struct afs_call *call)
{
<------>struct afs_callback_break *cb;
<------>struct yfs_xdr_YFSFid *bp;
<------>size_t size;
<------>int ret, loop;
 
<------>_enter("{%u}", call->unmarshall);
 
<------>switch (call->unmarshall) {
<------>case 0:
<------><------>afs_extract_to_tmp(call);
<------><------>call->unmarshall++;
 
<------><------>/* extract the FID array and its count in two steps */
<------><------>fallthrough;
<------>case 1:
<------><------>_debug("extract FID count");
<------><------>ret = afs_extract_data(call, true);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>call->count = ntohl(call->tmp);
<------><------>_debug("FID count: %u", call->count);
<------><------>if (call->count > YFSCBMAX)
<------><------><------>return afs_protocol_error(call, afs_eproto_cb_fid_count);
 
<------><------>size = array_size(call->count, sizeof(struct yfs_xdr_YFSFid));
<------><------>call->buffer = kmalloc(size, GFP_KERNEL);
<------><------>if (!call->buffer)
<------><------><------>return -ENOMEM;
<------><------>afs_extract_to_buf(call, size);
<------><------>call->unmarshall++;
 
<------><------>fallthrough;
<------>case 2:
<------><------>_debug("extract FID array");
<------><------>ret = afs_extract_data(call, false);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>_debug("unmarshall FID array");
<------><------>call->request = kcalloc(call->count,
<------><------><------><------><------>sizeof(struct afs_callback_break),
<------><------><------><------><------>GFP_KERNEL);
<------><------>if (!call->request)
<------><------><------>return -ENOMEM;
 
<------><------>cb = call->request;
<------><------>bp = call->buffer;
<------><------>for (loop = call->count; loop > 0; loop--, cb++) {
<------><------><------>cb->fid.vid	= xdr_to_u64(bp->volume);
<------><------><------>cb->fid.vnode	= xdr_to_u64(bp->vnode.lo);
<------><------><------>cb->fid.vnode_hi = ntohl(bp->vnode.hi);
<------><------><------>cb->fid.unique	= ntohl(bp->vnode.unique);
<------><------><------>bp++;
<------><------>}
 
<------><------>afs_extract_to_tmp(call);
<------><------>call->unmarshall++;
 
<------>case 3:
<------><------>break;
<------>}
 
<------>if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING))
<------><------>return afs_io_error(call, afs_io_error_cm_reply);
 
<------>/* We'll need the file server record as that tells us which set of
<------> * vnodes to operate upon.
<------> */
<------>return afs_find_cm_server_by_peer(call);
}