1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DNS_ADDRESS_SORTER_POSIX_H_
#define NET_DNS_ADDRESS_SORTER_POSIX_H_
#include <map>
#include <vector>
#include "base/containers/unique_ptr_adapters.h"
#include "base/memory/raw_ptr.h"
#include "base/threading/thread_checker.h"
#include "net/base/ip_address.h"
#include "net/base/net_export.h"
#include "net/base/network_change_notifier.h"
#include "net/dns/address_sorter.h"
#include "net/socket/datagram_client_socket.h"
namespace net {
class ClientSocketFactory;
// This implementation uses explicit policy to perform the sorting. It is not
// thread-safe and always completes synchronously.
class NET_EXPORT_PRIVATE AddressSorterPosix
: public AddressSorter,
public NetworkChangeNotifier::IPAddressObserver {
public:
// Generic policy entry.
struct PolicyEntry {
// IPv4 addresses must be mapped to IPv6.
unsigned char prefix[IPAddress::kIPv6AddressSize];
unsigned prefix_length;
unsigned value;
};
typedef std::vector<PolicyEntry> PolicyTable;
enum AddressScope {
SCOPE_UNDEFINED = 0,
SCOPE_NODELOCAL = 1,
SCOPE_LINKLOCAL = 2,
SCOPE_SITELOCAL = 5,
SCOPE_ORGLOCAL = 8,
SCOPE_GLOBAL = 14,
};
struct SourceAddressInfo {
// Values read from policy tables.
AddressScope scope = SCOPE_UNDEFINED;
unsigned label = 0;
// Values from the OS, matter only if more than one source address is used.
size_t prefix_length = 0;
bool deprecated = false; // vs. preferred RFC4862
bool home = false; // vs. care-of RFC6275
bool native = false;
};
typedef std::map<IPAddress, SourceAddressInfo> SourceAddressMap;
explicit AddressSorterPosix(ClientSocketFactory* socket_factory);
AddressSorterPosix(const AddressSorterPosix&) = delete;
AddressSorterPosix& operator=(const AddressSorterPosix&) = delete;
~AddressSorterPosix() override;
// AddressSorter:
void Sort(const std::vector<IPEndPoint>& endpoints,
CallbackType callback) const override;
private:
friend class AddressSorterPosixTest;
class SortContext;
// NetworkChangeNotifier::IPAddressObserver:
void OnIPAddressChanged() override;
// Fills |info| with values for |address| from policy tables.
void FillPolicy(const IPAddress& address, SourceAddressInfo* info) const;
void FinishedSort(SortContext* sort_context) const;
// Mutable to allow using default values for source addresses which were not
// found in most recent OnIPAddressChanged.
mutable SourceAddressMap source_map_;
raw_ptr<ClientSocketFactory> socket_factory_;
PolicyTable precedence_table_;
PolicyTable label_table_;
PolicyTable ipv4_scope_table_;
// SortContext stores data for an outstanding Sort() that is completing
// asynchronously. Mutable to allow pushing a new SortContext when Sort is
// called. Since Sort can be called multiple times, a container is necessary
// to track different SortContexts.
mutable std::set<std::unique_ptr<SortContext>, base::UniquePtrComparator>
sort_contexts_;
THREAD_CHECKER(thread_checker_);
};
} // namespace net
#endif // NET_DNS_ADDRESS_SORTER_POSIX_H_
|
