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351 lines
15 KiB
351 lines
15 KiB
/*
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* Copyright (c) 2017, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _I_OFFLOAD_MANAGER_H_
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#define _I_OFFLOAD_MANAGER_H_
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/* External Includes */
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#include <sys/types.h>
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/* Internal Includes */
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#include "OffloadStatistics.h"
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class IOffloadManager {
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public:
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enum RET {
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FAIL_TOO_MANY_PREFIXES = -6,
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FAIL_UNSUPPORTED = -5,
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FAIL_INPUT_CHECK = -4,
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FAIL_HARDWARE = -3,
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FAIL_UNNEEDED = -2,
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FAIL_TRY_AGAIN = -1,
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SUCCESS = 0,
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SUCCESS_DUPLICATE_CONFIG = 1,
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SUCCESS_NO_OP = 2,
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SUCCESS_OPTIMIZED = 3
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}; /* RET */
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enum IP_FAM {
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V4 = 0,
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V6 = 1,
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INVALID = 2
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}; /* IP_FAM */
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/* Overloading to use for addresses as well */
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typedef struct Prefix {
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IP_FAM fam;
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uint32_t v4Addr;
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uint32_t v4Mask;
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uint32_t v6Addr[4];
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uint32_t v6Mask[4];
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} prefix_t;
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/* ---------------------------- LIFECYCLE ------------------------------- */
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virtual ~IOffloadManager(){}
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/* ---------------------- ASYNC EVENT CALLBACKS ------------------------- */
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class IpaEventListener {
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public:
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enum StoppedReason {
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/**
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* Offload was stopped due to the configuration being removed via
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* setUpstreamParameters/removeDownstream.
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*/
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REQUESTED,
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/**
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* Offload was stopped due to an internal (to IPA or modem) error.
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*
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* Statistics may be temporarily unavailable.
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*/
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ERROR,
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/**
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* Offload was stopped because the upstream connection has
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* migrated to unsupported radio access technology.
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*
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* Statistics will still be available.
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*/
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UNSUPPORTED
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}; /* StoppedReason */
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virtual ~IpaEventListener(){}
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/**
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* Called when Offload first begins to occur on any upstream and
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* tether interface pair. It should be paired with an onOffloadStopped
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* call.
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*/
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virtual void onOffloadStarted(){}
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/**
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* Called when Offload stops occurring on all upstream and tether
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* interface pairs. It comes after a call to onOffloadStarted.
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*
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* @param reason Reason that Offload was stopped
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*/
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virtual void onOffloadStopped(StoppedReason /* reason */){}
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/**
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* Called when the hardware can support Offload again.
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*
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* Any statistics that were previously unavailable, may be queried
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* again at this time.
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*/
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virtual void onOffloadSupportAvailable(){}
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/**
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* Called when the limit set via setQuota has expired.
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*
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* It is implied that Offload has been stopped on all upstream and
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* tether interface pairs when this callback is called.
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*/
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virtual void onLimitReached(){}
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}; /* IpaEventListener */
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/**
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* Request notifications about asynchronous events that occur in hardware.
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*
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* The calling client must be able to handle the callback on a separate
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* thread (i.e. their implementation of IpaEventListener must be thread
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* safe).
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*
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* @return SUCCESS iff callback successfully registered
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*
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* Remarks: This can't really be allowed to fail.
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*/
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virtual RET registerEventListener(IpaEventListener* /* listener */) = 0;
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/**
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* Unregister a previously registered listener.
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*
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* @return SUCCESS iff callback successfully unregistered
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* FAIL_INPUT_CHECK if callback was never registered
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*/
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virtual RET unregisterEventListener(IpaEventListener* /* listener */) = 0;
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class ConntrackTimeoutUpdater {
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public:
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enum L4Protocol {
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TCP = 0,
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UDP = 1
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}; /* L4Protocol */
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typedef struct IpAddrPortPair {
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uint32_t ipAddr;
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uint16_t port;
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} ipAddrPortPair_t;
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typedef struct NatTimeoutUpdate {
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IpAddrPortPair src;
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IpAddrPortPair dst;
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L4Protocol proto;
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} natTimeoutUpdate_t;
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virtual ~ConntrackTimeoutUpdater(){}
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virtual void updateTimeout(NatTimeoutUpdate /* update */) {}
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}; /* ConntrackTimeoutUpdater */
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/**
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* Register a callback that may be called if the OffloadManager wants to
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* update the timeout value in conntrack of kernel.
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*
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* The calling client must be able to handle the callback on a separate
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* thread (i.e. their implementation of ConntrackTimeoutUpdater must be
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* thread safe)
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*
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* @return SUCCESS iff callback successfully registered
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*
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* Remarks: This can't really be allowed to fail
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*/
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virtual RET registerCtTimeoutUpdater(ConntrackTimeoutUpdater* /* cb */) = 0;
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/**
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* Unregister a previously registered callback.
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*
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* @return SUCCESS iff callback successfully unregistered
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* FAIL_INPUT_CHECK if callback was never registered
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*/
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virtual RET unregisterCtTimeoutUpdater(ConntrackTimeoutUpdater* /* cb */) = 0;
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/* ----------------------------- CONFIG --------------------------------- */
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/**
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* Provide a file descriptor for use with conntrack library
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*
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* @param fd File Descriptor that has been opened and bound to groups
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* @param groups Groups (bit mask) that fd has been bound to
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*
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* @return SUCCESS iff IOffloadManager needed this file descriptor and
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* it was properly bound.
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* FAIL_INPUT_CHECK if IOffloadManager needed this file descriptor
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* but it was found to not be properly bound
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* FAIL_UNNEEDED if IOffloadManager determined that it does not need
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* a file descriptor bound to these groups.
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*/
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virtual RET provideFd(int /* fd */, unsigned int /* group */) = 0;
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/**
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* Indicate that IOffloadManager <b>must</b> cease using all file
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* descriptors passed via provideFd API.
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*
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* After this call returns, the file descriptors will likely be closed by
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* the calling client.
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*
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* @return SUCCESS iff IOffloadManager has stopped using all file
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* descriptors
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* FAIL_TRY_AGAIN if IOffloadManager needs more time with these
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* file descriptors before it can release them
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*
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* Remarks: Currently, it would be very difficult to handle a FAIL_TRY_AGAIN
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* because HAL serivce does not own a thread outside of RPC
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* Threadpool to reschedule this call.
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*/
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virtual RET clearAllFds() = 0;
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/**
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* Query whether STA+AP offload is supported on this device.
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*
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* @return true if supported, false otherwise
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*/
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virtual bool isStaApSupported() = 0;
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/* ------------------------------ ROUTE --------------------------------- */
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/**
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* Add a downstream prefix that <i>may</i> be forwarded.
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*
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* The Prefix may be an IPv4 or IPv6 address to signify which family can be
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* offloaded from the specified tether interface. If the given IP family,
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* as determined by the Prefix, has a corresponding upstream configured,
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* then traffic should be forwarded between the two interfaces.
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*
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* Only traffic that has a downstream address within the specified Prefix
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* can be forwarded. Traffic from the same downstream interface that falls
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* outside of the Prefix will be unaffected and can be forwarded iff it was
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* previously configured via a separate addDownstream call.
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*
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* If no upstream has been configured, then this information must be cached
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* so that offload may begin once an upstream is configured.
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*
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* This API does <b>not</b> replace any previously configured downstreams
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* and must be explicitly removed by calling removeDownstream or by clearing
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* the entire configuration by calling stopAllOffload.
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*
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* @return SUCCESS The new information was accepted
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* FAIL_TOO_MANY_PREFIXES The hardware has already accepted the max
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* number of Prefixes that can be supported.
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* If offload is desired on this Prefix then
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* another must be removed first.
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* FAIL_UNSUPPORTED The hardware cannot forward traffic from this
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* downstream interface and will never be able to.
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*/
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virtual RET addDownstream(const char* /* downstream */,
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const Prefix& /* prefix */) = 0;
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/**
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* Remove a downstream Prefix that forwarding was previously requested for.
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*
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* The Prefix may be an IPv4 or IPv6 address. Traffic outside of this
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* Prefix is not affected.
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*
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* @return SUCCESS iff forwarding was previously occurring and has been
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* stopped
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* SUCCESS_NO_OP iff forwarding was not previously occurring and
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* therefore no action needed to be taken
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*/
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virtual RET removeDownstream(const char* /* downstream */,
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const Prefix& /* prefix */) = 0;
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/**
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* Indicate that hardware should forward traffic from any configured
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* downstreams to the specified upstream.
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*
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* When iface is non-null and non-empty and v4Gw is valid, then any
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* currently configured or future configured IPv4 downstreams should be
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* forwarded to this upstream interface.
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*
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* When iface is non-null and non-empty and v6Gw is valid, then any
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* currently configured or future configured IPv6 downstreams should be
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* forwarded to this upstream interface.
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*
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* @param iface Upstream interface name. Only one is needed because IPv4
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* and IPv6 interface names are required to match.
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* @param v4Gw The address of the IPv4 Gateway on the iface
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* @param v6Gw The address of one of the IPv6 Gateways on the iface
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*
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* @return SUCCESS iff the specified configuration was applied
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* SUCCESS_DUPLICATE_CONFIG if this configuration <i>exactly</i>
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* matches a previously provided
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* configuration. This means that no
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* action has to be taken, but, the
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* configuration was previously accepted
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* and applied.
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* FAIL_UNSUPPORTED if hardware cannot support forwarding to this
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* upstream interface
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*
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* Remarks: This overrides any previously configured parameters
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*/
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virtual RET setUpstream(const char* /* iface */, const Prefix& /* v4Gw */,
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const Prefix& /* v6Gw */) = 0;
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/**
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* All traffic must be returned to the software path and all configuration
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* (including provided file descriptors) must be forgotten.
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*
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* @return SUCCESS If all offload was successfully stopped and provided
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* file descriptors were released.
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*
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* Remarks: This can't really fail?
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*/
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virtual RET stopAllOffload() = 0;
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/* --------------------------- STATS/POLICY ----------------------------- */
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/**
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* Instruct hardware to stop forwarding traffic and send a callback after
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* limit bytes have been transferred in either direction on this upstream
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* interface.
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*
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* @param upstream Upstream interface name that the limit should apply to
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* @param limit Bytes limit that can occur before action should be taken
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*
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* @return SUCCESS If the limit was successfully applied
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* SUCCESS_OPTIMIZED If the limit was sufficiently high to be
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* interpreted as "no quota".
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* FAIL_HARDWARE If the limit was rejected by the hardware
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* FAIL_UNSUPPORTED If metering is not supported on this interface
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* FAIL_TRY_AGAIN If this upstream has not been previously
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* configured to allow offload
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* (via setUpstreamParameters)
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*/
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virtual RET setQuota(const char* /* upstream */, uint64_t /* limit */) = 0;
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/**
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* Query for statistics counters in hardware.
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*
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* This returns an aggregate of all hardware accelerated traffic which
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* has occurred on this upstream interface.
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*
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* @param upstream Interface on which traffic entered/exited
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* @param reset Whether hardware counters should reset after returning
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* current statistics
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* @param ret Output variable where statistics are returned
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*
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* @return SUCCESS If the statistics were successfully populated in ret and
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* were successfully reset if requested.
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* FAIL_TRY_AGAIN If the statistics are not currently available but
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* may be available later. This may occur during
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* a subsystem restart.
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* FAIL_UNSUPPORTED If statistics are not supported on this upstream
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*/
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virtual RET getStats(const char* /* upstream */, bool /* reset */,
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OffloadStatistics& /* ret */) = 0;
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}; /* IOffloadManager */
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#endif /* _I_OFFLOAD_MANAGER_H_ */
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