server/OffloadUtils.h

/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <errno.h>
#include <linux/if_ether.h>

#include <string>

#include "bpf/BpfUtils.h"
#include "netdbpf/bpf_shared.h"

namespace android {
namespace net {

int hardwareAddressType(const std::string& interface);

static inline int getClatEgressMapFd(void) {
    const int fd = bpf::bpfFdGet(CLAT_EGRESS_MAP_PATH, 0);
    return (fd == -1) ? -errno : fd;
}

static inline int getClatEgressProgFd(bool with_ethernet_header) {
    const int fd = bpf::bpfFdGet(
            with_ethernet_header ? CLAT_EGRESS_PROG_ETHER_PATH : CLAT_EGRESS_PROG_RAWIP_PATH, 0);
    return (fd == -1) ? -errno : fd;
}

static inline int getClatIngressMapFd(void) {
    const int fd = bpf::bpfFdGet(CLAT_INGRESS_MAP_PATH, 0);
    return (fd == -1) ? -errno : fd;
}

static inline int getClatIngressProgFd(bool with_ethernet_header) {
    const int fd = bpf::bpfFdGet(
            with_ethernet_header ? CLAT_INGRESS_PROG_ETHER_PATH : CLAT_INGRESS_PROG_RAWIP_PATH, 0);
    return (fd == -1) ? -errno : fd;
}

int openNetlinkSocket(void);

int processNetlinkResponse(int fd);

int tcQdiscAddDevClsact(int fd, int ifIndex);
int tcQdiscReplaceDevClsact(int fd, int ifIndex);
int tcQdiscDelDevClsact(int fd, int ifIndex);

int tcFilterAddDevIngressBpf(int fd, int ifIndex, int bpfFd, bool ethernet);
int tcFilterAddDevEgressBpf(int fd, int ifIndex, int bpfFd, bool ethernet);

// tc filter del dev .. in/egress prio .. protocol ..
int tcFilterDelDev(int fd, int ifIndex, bool ingress, uint16_t prio, uint16_t proto);

// tc filter del dev .. ingress prio 1 protocol ipv6
static inline int tcFilterDelDevIngressClatIpv6(int fd, int ifIndex) {
    return tcFilterDelDev(fd, ifIndex, /*ingress*/ true, /*prio*/ 1, ETH_P_IPV6);
}

// tc filter del dev .. egress prio 1 protocol ip
static inline int tcFilterDelDevEgressClatIpv4(int fd, int ifIndex) {
    return tcFilterDelDev(fd, ifIndex, /*ingress*/ false, /*prio*/ 1, ETH_P_IP);
}

}  // namespace net
}  // namespace android