/usr/include/bcc/BPFTable.h is in libbpfcc-dev 0.5.0-5ubuntu1.
This file is owned by root:root, with mode 0o644.
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* Copyright (c) 2016 Facebook, Inc.
*
* 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 <cstring>
#include <sys/epoll.h>
#include <exception>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "bcc_exception.h"
#include "bcc_syms.h"
#include "bpf_module.h"
#include "libbpf.h"
#include "perf_reader.h"
#include "table_desc.h"
namespace ebpf {
template <class KeyType, class ValueType>
class BPFTableBase {
public:
size_t capacity() { return desc.max_entries; }
StatusTuple string_to_key(const std::string& key_str, KeyType* key) {
return desc.key_sscanf(key_str.c_str(), key);
}
StatusTuple string_to_leaf(const std::string& value_str, ValueType* value) {
return desc.leaf_sscanf(value_str.c_str(), value);
}
StatusTuple key_to_string(const KeyType* key, std::string& key_str) {
char buf[8 * desc.key_size];
StatusTuple rc = desc.key_snprintf(buf, sizeof(buf), key);
if (!rc.code())
key_str.assign(buf);
return rc;
}
StatusTuple leaf_to_string(const ValueType* value, std::string& value_str) {
char buf[8 * desc.leaf_size];
StatusTuple rc = desc.leaf_snprintf(buf, sizeof(buf), value);
if (!rc.code())
value_str.assign(buf);
return rc;
}
protected:
explicit BPFTableBase(const TableDesc& desc) : desc(desc) {}
bool lookup(KeyType* key, ValueType* value) {
return bpf_lookup_elem(desc.fd, static_cast<void*>(key),
static_cast<void*>(value)) >= 0;
}
bool first(KeyType* key) {
return bpf_get_first_key(desc.fd, static_cast<void*>(key),
desc.key_size) >= 0;
}
bool next(KeyType* key, KeyType* next_key) {
return bpf_get_next_key(desc.fd, static_cast<void*>(key),
static_cast<void*>(next_key)) >= 0;
}
bool update(KeyType* key, ValueType* value) {
return bpf_update_elem(desc.fd, static_cast<void*>(key),
static_cast<void*>(value), 0) >= 0;
}
bool remove(KeyType* key) {
return bpf_delete_elem(desc.fd, static_cast<void*>(key)) >= 0;
}
const TableDesc& desc;
};
class BPFTable : public BPFTableBase<void, void> {
public:
BPFTable(const TableDesc& desc);
StatusTuple get_value(const std::string& key_str, std::string& value);
StatusTuple update_value(const std::string& key_str,
const std::string& value_str);
StatusTuple remove_value(const std::string& key_str);
};
template <class ValueType>
class BPFArrayTable : public BPFTableBase<int, ValueType> {
public:
BPFArrayTable(const TableDesc& desc)
: BPFTableBase<int, ValueType>(desc) {
if (desc.type != BPF_MAP_TYPE_ARRAY &&
desc.type != BPF_MAP_TYPE_PERCPU_ARRAY)
throw std::invalid_argument("Table '" + desc.name + "' is not an array table");
}
StatusTuple get_value(const int& index, ValueType& value) {
if (!this->lookup(const_cast<int*>(&index), &value))
return StatusTuple(-1, "Error getting value: %s", std::strerror(errno));
return StatusTuple(0);
}
StatusTuple update_value(const int& index, const ValueType& value) {
if (!this->update(const_cast<int*>(&index), const_cast<ValueType*>(&value)))
return StatusTuple(-1, "Error updating value: %s", std::strerror(errno));
return StatusTuple(0);
}
ValueType operator[](const int& key) {
ValueType value;
get_value(key, value);
return value;
}
std::vector<ValueType> get_table_offline() {
std::vector<ValueType> res(this->capacity());
for (int i = 0; i < (int) this->capacity(); i++) {
get_value(i, res[i]);
}
return res;
}
};
template <class KeyType, class ValueType>
class BPFHashTable : public BPFTableBase<KeyType, ValueType> {
public:
explicit BPFHashTable(const TableDesc& desc)
: BPFTableBase<KeyType, ValueType>(desc) {
if (desc.type != BPF_MAP_TYPE_HASH &&
desc.type != BPF_MAP_TYPE_PERCPU_HASH &&
desc.type != BPF_MAP_TYPE_LRU_HASH &&
desc.type != BPF_MAP_TYPE_LRU_PERCPU_HASH)
throw std::invalid_argument("Table '" + desc.name + "' is not a hash table");
}
StatusTuple get_value(const KeyType& key, ValueType& value) {
if (!this->lookup(const_cast<KeyType*>(&key), &value))
return StatusTuple(-1, "Error getting value: %s", std::strerror(errno));
return StatusTuple(0);
}
StatusTuple update_value(const KeyType& key, const ValueType& value) {
if (!this->update(const_cast<KeyType*>(&key), const_cast<ValueType*>(&value)))
return StatusTuple(-1, "Error updating value: %s", std::strerror(errno));
return StatusTuple(0);
}
StatusTuple remove_value(const KeyType& key) {
if (!this->remove(const_cast<KeyType*>(&key)))
return StatusTuple(-1, "Error removing value: %s", std::strerror(errno));
return StatusTuple(0);
}
ValueType operator[](const KeyType& key) {
ValueType value;
get_value(key, value);
return value;
}
std::vector<std::pair<KeyType, ValueType>> get_table_offline() {
std::vector<std::pair<KeyType, ValueType>> res;
KeyType cur;
ValueType value;
if (!this->first(&cur))
return res;
while (true) {
if (!this->lookup(&cur, &value))
break;
res.emplace_back(cur, value);
if (!this->next(&cur, &cur))
break;
}
return res;
}
};
// From src/cc/export/helpers.h
static const int BPF_MAX_STACK_DEPTH = 127;
struct stacktrace_t {
uintptr_t ip[BPF_MAX_STACK_DEPTH];
};
class BPFStackTable : public BPFTableBase<int, stacktrace_t> {
public:
BPFStackTable(const TableDesc& desc,
bool use_debug_file,
bool check_debug_file_crc);
~BPFStackTable();
std::vector<uintptr_t> get_stack_addr(int stack_id);
std::vector<std::string> get_stack_symbol(int stack_id, int pid);
private:
bcc_symbol_option symbol_option_;
std::map<int, void*> pid_sym_;
};
class BPFPerfBuffer : public BPFTableBase<int, int> {
public:
BPFPerfBuffer(const TableDesc& desc)
: BPFTableBase<int, int>(desc), epfd_(-1) {}
~BPFPerfBuffer();
StatusTuple open_all_cpu(perf_reader_raw_cb cb, perf_reader_lost_cb lost_cb,
void* cb_cookie, int page_cnt);
StatusTuple close_all_cpu();
void poll(int timeout);
private:
StatusTuple open_on_cpu(perf_reader_raw_cb cb, perf_reader_lost_cb lost_cb,
int cpu, void* cb_cookie, int page_cnt);
StatusTuple close_on_cpu(int cpu);
std::map<int, perf_reader*> cpu_readers_;
int epfd_;
std::unique_ptr<epoll_event[]> ep_events_;
};
class BPFPerfEventArray : public BPFTableBase<int, int> {
public:
BPFPerfEventArray(const TableDesc& desc)
: BPFTableBase<int, int>(desc) {}
~BPFPerfEventArray();
StatusTuple open_all_cpu(uint32_t type, uint64_t config);
StatusTuple close_all_cpu();
private:
StatusTuple open_on_cpu(int cpu, uint32_t type, uint64_t config);
StatusTuple close_on_cpu(int cpu);
std::map<int, int> cpu_fds_;
};
class BPFProgTable : public BPFTableBase<int, int> {
public:
BPFProgTable(const TableDesc& desc)
: BPFTableBase<int, int>(desc) {
if (desc.type != BPF_MAP_TYPE_PROG_ARRAY)
throw std::invalid_argument("Table '" + desc.name + "' is not a prog table");
}
// updates an element
StatusTuple update_value(const int& index, const int& value) {
if (!this->update(const_cast<int*>(&index), const_cast<int*>(&value)))
return StatusTuple(-1, "Error updating value: %s", std::strerror(errno));
return StatusTuple(0);
}
};
} // namespace ebpf
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