1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef NET_BASE_NET_UTIL_H_ 6#define NET_BASE_NET_UTIL_H_ 7 8#include "build/build_config.h" 9 10#if defined(OS_WIN) 11#include <windows.h> 12#include <ws2tcpip.h> 13#elif defined(OS_POSIX) 14#include <sys/types.h> 15#include <sys/socket.h> 16#endif 17 18#include <string> 19#include <vector> 20 21#include "base/basictypes.h" 22#include "base/strings/string16.h" 23#include "net/base/address_family.h" 24#include "net/base/escape.h" 25#include "net/base/net_export.h" 26#include "net/base/net_log.h" 27 28class GURL; 29 30namespace base { 31class FilePath; 32class Time; 33} 34 35namespace url_canon { 36struct CanonHostInfo; 37} 38 39namespace url_parse { 40struct Parsed; 41} 42 43namespace net { 44 45// Used by FormatUrl to specify handling of certain parts of the url. 46typedef uint32 FormatUrlType; 47typedef uint32 FormatUrlTypes; 48 49// IPAddressNumber is used to represent an IP address's numeric value as an 50// array of bytes, from most significant to least significant. This is the 51// network byte ordering. 52// 53// IPv4 addresses will have length 4, whereas IPv6 address will have length 16. 54typedef std::vector<unsigned char> IPAddressNumber; 55typedef std::vector<IPAddressNumber> IPAddressList; 56 57static const size_t kIPv4AddressSize = 4; 58static const size_t kIPv6AddressSize = 16; 59 60// Nothing is ommitted. 61NET_EXPORT extern const FormatUrlType kFormatUrlOmitNothing; 62 63// If set, any username and password are removed. 64NET_EXPORT extern const FormatUrlType kFormatUrlOmitUsernamePassword; 65 66// If the scheme is 'http://', it's removed. 67NET_EXPORT extern const FormatUrlType kFormatUrlOmitHTTP; 68 69// Omits the path if it is just a slash and there is no query or ref. This is 70// meaningful for non-file "standard" URLs. 71NET_EXPORT extern const FormatUrlType kFormatUrlOmitTrailingSlashOnBareHostname; 72 73// Convenience for omitting all unecessary types. 74NET_EXPORT extern const FormatUrlType kFormatUrlOmitAll; 75 76// Returns the number of explicitly allowed ports; for testing. 77NET_EXPORT_PRIVATE extern size_t GetCountOfExplicitlyAllowedPorts(); 78 79// Given the full path to a file name, creates a file: URL. The returned URL 80// may not be valid if the input is malformed. 81NET_EXPORT GURL FilePathToFileURL(const base::FilePath& path); 82 83// Converts a file: URL back to a filename that can be passed to the OS. The 84// file URL must be well-formed (GURL::is_valid() must return true); we don't 85// handle degenerate cases here. Returns true on success, false if it isn't a 86// valid file URL. On failure, *file_path will be empty. 87NET_EXPORT bool FileURLToFilePath(const GURL& url, base::FilePath* file_path); 88 89// Splits an input of the form <host>[":"<port>] into its consitituent parts. 90// Saves the result into |*host| and |*port|. If the input did not have 91// the optional port, sets |*port| to -1. 92// Returns true if the parsing was successful, false otherwise. 93// The returned host is NOT canonicalized, and may be invalid. If <host> is 94// an IPv6 literal address, the returned host includes the square brackets. 95NET_EXPORT bool ParseHostAndPort( 96 std::string::const_iterator host_and_port_begin, 97 std::string::const_iterator host_and_port_end, 98 std::string* host, 99 int* port); 100NET_EXPORT bool ParseHostAndPort( 101 const std::string& host_and_port, 102 std::string* host, 103 int* port); 104 105// Returns a host:port string for the given URL. 106NET_EXPORT std::string GetHostAndPort(const GURL& url); 107 108// Returns a host[:port] string for the given URL, where the port is omitted 109// if it is the default for the URL's scheme. 110NET_EXPORT_PRIVATE std::string GetHostAndOptionalPort(const GURL& url); 111 112// Returns true if |hostname| contains a non-registerable or non-assignable 113// domain name (eg: a gTLD that has not been assigned by IANA) or an IP address 114// that falls in an IANA-reserved range. 115NET_EXPORT bool IsHostnameNonUnique(const std::string& hostname); 116 117// Returns true if an IP address hostname is in a range reserved by the IANA. 118// Works with both IPv4 and IPv6 addresses, and only compares against a given 119// protocols's reserved ranges. 120NET_EXPORT bool IsIPAddressReserved(const IPAddressNumber& address); 121 122// Convenience struct for when you need a |struct sockaddr|. 123struct SockaddrStorage { 124 SockaddrStorage() : addr_len(sizeof(addr_storage)), 125 addr(reinterpret_cast<struct sockaddr*>(&addr_storage)) {} 126 struct sockaddr_storage addr_storage; 127 socklen_t addr_len; 128 struct sockaddr* const addr; 129}; 130 131// Extracts the IP address and port portions of a sockaddr. |port| is optional, 132// and will not be filled in if NULL. 133bool GetIPAddressFromSockAddr(const struct sockaddr* sock_addr, 134 socklen_t sock_addr_len, 135 const unsigned char** address, 136 size_t* address_len, 137 uint16* port); 138 139// Returns the string representation of an IP address. 140// For example: "192.168.0.1" or "::1". 141NET_EXPORT std::string IPAddressToString(const uint8* address, 142 size_t address_len); 143 144// Returns the string representation of an IP address along with its port. 145// For example: "192.168.0.1:99" or "[::1]:80". 146NET_EXPORT std::string IPAddressToStringWithPort(const uint8* address, 147 size_t address_len, 148 uint16 port); 149 150// Same as IPAddressToString() but for a sockaddr. This output will not include 151// the IPv6 scope ID. 152NET_EXPORT std::string NetAddressToString(const struct sockaddr* sa, 153 socklen_t sock_addr_len); 154 155// Same as IPAddressToStringWithPort() but for a sockaddr. This output will not 156// include the IPv6 scope ID. 157NET_EXPORT std::string NetAddressToStringWithPort(const struct sockaddr* sa, 158 socklen_t sock_addr_len); 159 160// Same as IPAddressToString() but for an IPAddressNumber. 161NET_EXPORT std::string IPAddressToString(const IPAddressNumber& addr); 162 163// Same as IPAddressToStringWithPort() but for an IPAddressNumber. 164NET_EXPORT std::string IPAddressToStringWithPort( 165 const IPAddressNumber& addr, uint16 port); 166 167// Returns the address as a sequence of bytes in network-byte-order. 168NET_EXPORT std::string IPAddressToPackedString(const IPAddressNumber& addr); 169 170// Returns the hostname of the current system. Returns empty string on failure. 171NET_EXPORT std::string GetHostName(); 172 173// Extracts the unescaped username/password from |url|, saving the results 174// into |*username| and |*password|. 175NET_EXPORT_PRIVATE void GetIdentityFromURL(const GURL& url, 176 base::string16* username, 177 base::string16* password); 178 179// Returns either the host from |url|, or, if the host is empty, the full spec. 180NET_EXPORT std::string GetHostOrSpecFromURL(const GURL& url); 181 182// Return the value of the HTTP response header with name 'name'. 'headers' 183// should be in the format that URLRequest::GetResponseHeaders() returns. 184// Returns the empty string if the header is not found. 185NET_EXPORT std::string GetSpecificHeader(const std::string& headers, 186 const std::string& name); 187 188// Converts the given host name to unicode characters. This can be called for 189// any host name, if the input is not IDN or is invalid in some way, we'll just 190// return the ASCII source so it is still usable. 191// 192// The input should be the canonicalized ASCII host name from GURL. This 193// function does NOT accept UTF-8! 194// 195// |languages| is a comma separated list of ISO 639 language codes. It 196// is used to determine whether a hostname is 'comprehensible' to a user 197// who understands languages listed. |host| will be converted to a 198// human-readable form (Unicode) ONLY when each component of |host| is 199// regarded as 'comprehensible'. Scipt-mixing is not allowed except that 200// Latin letters in the ASCII range can be mixed with a limited set of 201// script-language pairs (currently Han, Kana and Hangul for zh,ja and ko). 202// When |languages| is empty, even that mixing is not allowed. 203NET_EXPORT base::string16 IDNToUnicode(const std::string& host, 204 const std::string& languages); 205 206// Canonicalizes |host| and returns it. Also fills |host_info| with 207// IP address information. |host_info| must not be NULL. 208NET_EXPORT std::string CanonicalizeHost(const std::string& host, 209 url_canon::CanonHostInfo* host_info); 210 211// Returns true if |host| is not an IP address and is compliant with a set of 212// rules based on RFC 1738 and tweaked to be compatible with the real world. 213// The rules are: 214// * One or more components separated by '.' 215// * Each component begins with an alphanumeric character or '-' 216// * Each component contains only alphanumeric characters and '-' or '_' 217// * Each component ends with an alphanumeric character or '-' 218// * The last component begins with an alphanumeric character 219// * Optional trailing dot after last component (means "treat as FQDN") 220// If |desired_tld| is non-NULL, the host will only be considered invalid if 221// appending it as a trailing component still results in an invalid host. This 222// helps us avoid marking as "invalid" user attempts to open, say, "www.-9.com" 223// by typing -, 9, <ctrl>+<enter>. 224// 225// NOTE: You should only pass in hosts that have been returned from 226// CanonicalizeHost(), or you may not get accurate results. 227NET_EXPORT bool IsCanonicalizedHostCompliant(const std::string& host, 228 const std::string& desired_tld); 229 230// Call these functions to get the html snippet for a directory listing. 231// The return values of both functions are in UTF-8. 232NET_EXPORT std::string GetDirectoryListingHeader(const base::string16& title); 233 234// Given the name of a file in a directory (ftp or local) and 235// other information (is_dir, size, modification time), it returns 236// the html snippet to add the entry for the file to the directory listing. 237// Currently, it's a script tag containing a call to a Javascript function 238// |addRow|. 239// 240// |name| is the file name to be displayed. |raw_bytes| will be used 241// as the actual target of the link (so for example, ftp links should use 242// server's encoding). If |raw_bytes| is an empty string, UTF-8 encoded |name| 243// will be used. 244// 245// Both |name| and |raw_bytes| are escaped internally. 246NET_EXPORT std::string GetDirectoryListingEntry(const base::string16& name, 247 const std::string& raw_bytes, 248 bool is_dir, int64 size, 249 base::Time modified); 250 251// If text starts with "www." it is removed, otherwise text is returned 252// unmodified. 253NET_EXPORT base::string16 StripWWW(const base::string16& text); 254 255// Runs |url|'s host through StripWWW(). |url| must be valid. 256NET_EXPORT base::string16 StripWWWFromHost(const GURL& url); 257 258// Generates a filename using the first successful method from the following (in 259// order): 260// 261// 1) The raw Content-Disposition header in |content_disposition| as read from 262// the network. |referrer_charset| is used to decode non-ASCII strings. 263// 2) |suggested_name| if specified. |suggested_name| is assumed to be in 264// UTF-8. 265// 3) The filename extracted from the |url|. |referrer_charset| will be used to 266// interpret the URL if there are non-ascii characters. 267// 4) |default_name|. If non-empty, |default_name| is assumed to be a filename 268// and shouldn't contain a path. |default_name| is not subject to validation 269// or sanitization, and therefore shouldn't be a user supplied string. 270// 5) The hostname portion from the |url| 271// 272// Then, leading and trailing '.'s will be removed. On Windows, trailing spaces 273// are also removed. The string "download" is the final fallback if no filename 274// is found or the filename is empty. 275// 276// Any illegal characters in the filename will be replaced by '-'. If the 277// filename doesn't contain an extension, and a |mime_type| is specified, the 278// preferred extension for the |mime_type| will be appended to the filename. 279// The resulting filename is then checked against a list of reserved names on 280// Windows. If the name is reserved, an underscore will be prepended to the 281// filename. 282// 283// Note: |mime_type| should only be specified if this function is called from a 284// thread that allows IO. 285NET_EXPORT base::string16 GetSuggestedFilename( 286 const GURL& url, 287 const std::string& content_disposition, 288 const std::string& referrer_charset, 289 const std::string& suggested_name, 290 const std::string& mime_type, 291 const std::string& default_name); 292 293// Similar to GetSuggestedFilename(), but returns a FilePath. 294NET_EXPORT base::FilePath GenerateFileName( 295 const GURL& url, 296 const std::string& content_disposition, 297 const std::string& referrer_charset, 298 const std::string& suggested_name, 299 const std::string& mime_type, 300 const std::string& default_name); 301 302// Valid components: 303// * are not empty 304// * are not Windows reserved names (CON, NUL.zip, etc.) 305// * do not have trailing separators 306// * do not equal kCurrentDirectory 307// * do not reference the parent directory 308// * do not contain illegal characters 309// * do not end with Windows shell-integrated extensions (even on posix) 310// * do not begin with '.' (which would hide them in most file managers) 311// * do not end with ' ' or '.' 312NET_EXPORT bool IsSafePortablePathComponent(const base::FilePath& component); 313 314// Basenames of valid relative paths are IsSafePortableBasename(), and internal 315// path components of valid relative paths are valid path components as 316// described above IsSafePortableBasename(). Valid relative paths are not 317// absolute paths. 318NET_EXPORT bool IsSafePortableRelativePath(const base::FilePath& path); 319 320// Ensures that the filename and extension is safe to use in the filesystem. 321// 322// Assumes that |file_path| already contains a valid path or file name. On 323// Windows if the extension causes the file to have an unsafe interaction with 324// the shell (see net_util::IsShellIntegratedExtension()), then it will be 325// replaced by the string 'download'. If |file_path| doesn't contain an 326// extension or |ignore_extension| is true then the preferred extension, if one 327// exists, for |mime_type| will be used as the extension. 328// 329// On Windows, the filename will be checked against a set of reserved names, and 330// if so, an underscore will be prepended to the name. 331// 332// |file_name| can either be just the file name or it can be a full path to a 333// file. 334// 335// Note: |mime_type| should only be non-empty if this function is called from a 336// thread that allows IO. 337NET_EXPORT void GenerateSafeFileName(const std::string& mime_type, 338 bool ignore_extension, 339 base::FilePath* file_path); 340 341// Checks |port| against a list of ports which are restricted by default. 342// Returns true if |port| is allowed, false if it is restricted. 343NET_EXPORT bool IsPortAllowedByDefault(int port); 344 345// Checks |port| against a list of ports which are restricted by the FTP 346// protocol. Returns true if |port| is allowed, false if it is restricted. 347NET_EXPORT_PRIVATE bool IsPortAllowedByFtp(int port); 348 349// Check if banned |port| has been overriden by an entry in 350// |explicitly_allowed_ports_|. 351NET_EXPORT_PRIVATE bool IsPortAllowedByOverride(int port); 352 353// Set socket to non-blocking mode 354NET_EXPORT int SetNonBlocking(int fd); 355 356// Formats the host in |url| and appends it to |output|. The host formatter 357// takes the same accept languages component as ElideURL(). 358NET_EXPORT void AppendFormattedHost(const GURL& url, 359 const std::string& languages, 360 base::string16* output); 361 362// Creates a string representation of |url|. The IDN host name may be in Unicode 363// if |languages| accepts the Unicode representation. |format_type| is a bitmask 364// of FormatUrlTypes, see it for details. |unescape_rules| defines how to clean 365// the URL for human readability. You will generally want |UnescapeRule::SPACES| 366// for display to the user if you can handle spaces, or |UnescapeRule::NORMAL| 367// if not. If the path part and the query part seem to be encoded in %-encoded 368// UTF-8, decodes %-encoding and UTF-8. 369// 370// The last three parameters may be NULL. 371// 372// |new_parsed| will be set to the parsing parameters of the resultant URL. 373// 374// |prefix_end| will be the length before the hostname of the resultant URL. 375// 376// |offset[s]_for_adjustment| specifies one or more offsets into the original 377// URL, representing insertion or selection points between characters: if the 378// input is "http://foo.com/", offset 0 is before the entire URL, offset 7 is 379// between the scheme and the host, and offset 15 is after the end of the URL. 380// Valid input offsets range from 0 to the length of the input URL string. On 381// exit, each offset will have been modified to reflect any changes made to the 382// output string. For example, if |url| is "http://a:b@c.com/", 383// |omit_username_password| is true, and an offset is 12 (pointing between 'c' 384// and '.'), then on return the output string will be "http://c.com/" and the 385// offset will be 8. If an offset cannot be successfully adjusted (e.g. because 386// it points into the middle of a component that was entirely removed or into 387// the middle of an encoding sequence), it will be set to base::string16::npos. 388// For consistency, if an input offset points between the scheme and the 389// username/password, and both are removed, on output this offset will be 0 390// rather than npos; this means that offsets at the starts and ends of removed 391// components are always transformed the same way regardless of what other 392// components are adjacent. 393NET_EXPORT base::string16 FormatUrl(const GURL& url, 394 const std::string& languages, 395 FormatUrlTypes format_types, 396 UnescapeRule::Type unescape_rules, 397 url_parse::Parsed* new_parsed, 398 size_t* prefix_end, 399 size_t* offset_for_adjustment); 400NET_EXPORT base::string16 FormatUrlWithOffsets( 401 const GURL& url, 402 const std::string& languages, 403 FormatUrlTypes format_types, 404 UnescapeRule::Type unescape_rules, 405 url_parse::Parsed* new_parsed, 406 size_t* prefix_end, 407 std::vector<size_t>* offsets_for_adjustment); 408 409// This is a convenience function for FormatUrl() with 410// format_types = kFormatUrlOmitAll and unescape = SPACES. This is the typical 411// set of flags for "URLs to display to the user". You should be cautious about 412// using this for URLs which will be parsed or sent to other applications. 413inline base::string16 FormatUrl(const GURL& url, const std::string& languages) { 414 return FormatUrl(url, languages, kFormatUrlOmitAll, UnescapeRule::SPACES, 415 NULL, NULL, NULL); 416} 417 418// Returns whether FormatUrl() would strip a trailing slash from |url|, given a 419// format flag including kFormatUrlOmitTrailingSlashOnBareHostname. 420NET_EXPORT bool CanStripTrailingSlash(const GURL& url); 421 422// Strip the portions of |url| that aren't core to the network request. 423// - user name / password 424// - reference section 425NET_EXPORT_PRIVATE GURL SimplifyUrlForRequest(const GURL& url); 426 427NET_EXPORT void SetExplicitlyAllowedPorts(const std::string& allowed_ports); 428 429class NET_EXPORT ScopedPortException { 430 public: 431 explicit ScopedPortException(int port); 432 ~ScopedPortException(); 433 434 private: 435 int port_; 436 437 DISALLOW_COPY_AND_ASSIGN(ScopedPortException); 438}; 439 440// Returns true if it can determine that only loopback addresses are configured. 441// i.e. if only 127.0.0.1 and ::1 are routable. 442// Also returns false if it cannot determine this. 443bool HaveOnlyLoopbackAddresses(); 444 445// Returns AddressFamily of the address. 446NET_EXPORT_PRIVATE AddressFamily GetAddressFamily( 447 const IPAddressNumber& address); 448 449// Maps the given AddressFamily to either AF_INET, AF_INET6 or AF_UNSPEC. 450NET_EXPORT_PRIVATE int ConvertAddressFamily(AddressFamily address_family); 451 452// Parses an IP address literal (either IPv4 or IPv6) to its numeric value. 453// Returns true on success and fills |ip_number| with the numeric value. 454NET_EXPORT_PRIVATE bool ParseIPLiteralToNumber(const std::string& ip_literal, 455 IPAddressNumber* ip_number); 456 457// Converts an IPv4 address to an IPv4-mapped IPv6 address. 458// For example 192.168.0.1 would be converted to ::ffff:192.168.0.1. 459NET_EXPORT_PRIVATE IPAddressNumber ConvertIPv4NumberToIPv6Number( 460 const IPAddressNumber& ipv4_number); 461 462// Returns true iff |address| is an IPv4-mapped IPv6 address. 463NET_EXPORT_PRIVATE bool IsIPv4Mapped(const IPAddressNumber& address); 464 465// Converts an IPv4-mapped IPv6 address to IPv4 address. Should only be called 466// on IPv4-mapped IPv6 addresses. 467NET_EXPORT_PRIVATE IPAddressNumber ConvertIPv4MappedToIPv4( 468 const IPAddressNumber& address); 469 470// Parses an IP block specifier from CIDR notation to an 471// (IP address, prefix length) pair. Returns true on success and fills 472// |*ip_number| with the numeric value of the IP address and sets 473// |*prefix_length_in_bits| with the length of the prefix. 474// 475// CIDR notation literals can use either IPv4 or IPv6 literals. Some examples: 476// 477// 10.10.3.1/20 478// a:b:c::/46 479// ::1/128 480NET_EXPORT bool ParseCIDRBlock(const std::string& cidr_literal, 481 IPAddressNumber* ip_number, 482 size_t* prefix_length_in_bits); 483 484// Compares an IP address to see if it falls within the specified IP block. 485// Returns true if it does, false otherwise. 486// 487// The IP block is given by (|ip_prefix|, |prefix_length_in_bits|) -- any 488// IP address whose |prefix_length_in_bits| most significant bits match 489// |ip_prefix| will be matched. 490// 491// In cases when an IPv4 address is being compared to an IPv6 address prefix 492// and vice versa, the IPv4 addresses will be converted to IPv4-mapped 493// (IPv6) addresses. 494NET_EXPORT_PRIVATE bool IPNumberMatchesPrefix(const IPAddressNumber& ip_number, 495 const IPAddressNumber& ip_prefix, 496 size_t prefix_length_in_bits); 497 498// Retuns the port field of the |sockaddr|. 499const uint16* GetPortFieldFromSockaddr(const struct sockaddr* address, 500 socklen_t address_len); 501// Returns the value of port in |sockaddr| (in host byte ordering). 502NET_EXPORT_PRIVATE int GetPortFromSockaddr(const struct sockaddr* address, 503 socklen_t address_len); 504 505// Returns true if |host| is one of the names (e.g. "localhost") or IP 506// addresses (IPv4 127.0.0.0/8 or IPv6 ::1) that indicate a loopback. 507// 508// Note that this function does not check for IP addresses other than 509// the above, although other IP addresses may point to the local 510// machine. 511NET_EXPORT_PRIVATE bool IsLocalhost(const std::string& host); 512 513// struct that is used by GetNetworkList() to represent a network 514// interface. 515struct NET_EXPORT NetworkInterface { 516 NetworkInterface(); 517 NetworkInterface(const std::string& name, 518 uint32 interface_index, 519 const IPAddressNumber& address, 520 size_t network_prefix); 521 ~NetworkInterface(); 522 523 std::string name; 524 uint32 interface_index; // Always 0 on Android. 525 IPAddressNumber address; 526 size_t network_prefix; 527}; 528 529typedef std::vector<NetworkInterface> NetworkInterfaceList; 530 531// Returns list of network interfaces except loopback interface. If an 532// interface has more than one address, a separate entry is added to 533// the list for each address. 534// Can be called only on a thread that allows IO. 535NET_EXPORT bool GetNetworkList(NetworkInterfaceList* networks); 536 537// General category of the IEEE 802.11 (wifi) physical layer operating mode. 538enum WifiPHYLayerProtocol { 539 // No wifi support or no associated AP. 540 WIFI_PHY_LAYER_PROTOCOL_NONE, 541 // An obsolete modes introduced by the original 802.11, e.g. IR, FHSS, 542 WIFI_PHY_LAYER_PROTOCOL_ANCIENT, 543 // 802.11a, OFDM-based rates. 544 WIFI_PHY_LAYER_PROTOCOL_A, 545 // 802.11b, DSSS or HR DSSS. 546 WIFI_PHY_LAYER_PROTOCOL_B, 547 // 802.11g, same rates as 802.11a but compatible with 802.11b. 548 WIFI_PHY_LAYER_PROTOCOL_G, 549 // 802.11n, HT rates. 550 WIFI_PHY_LAYER_PROTOCOL_N, 551 // Unclassified mode or failure to identify. 552 WIFI_PHY_LAYER_PROTOCOL_UNKNOWN 553}; 554 555// Characterize the PHY mode of the currently associated access point. 556// Currently only available on OS_WIN. 557NET_EXPORT WifiPHYLayerProtocol GetWifiPHYLayerProtocol(); 558 559// Returns number of matching initial bits between the addresses |a1| and |a2|. 560unsigned CommonPrefixLength(const IPAddressNumber& a1, 561 const IPAddressNumber& a2); 562 563// Computes the number of leading 1-bits in |mask|. 564unsigned MaskPrefixLength(const IPAddressNumber& mask); 565 566// Differentiated Services Code Point. 567// See http://tools.ietf.org/html/rfc2474 for details. 568enum DiffServCodePoint { 569 DSCP_NO_CHANGE = -1, 570 DSCP_DEFAULT = 0, // Same as DSCP_CS0 571 DSCP_CS0 = 0, // The default 572 DSCP_CS1 = 8, // Bulk/background traffic 573 DSCP_AF11 = 10, 574 DSCP_AF12 = 12, 575 DSCP_AF13 = 14, 576 DSCP_CS2 = 16, 577 DSCP_AF21 = 18, 578 DSCP_AF22 = 20, 579 DSCP_AF23 = 22, 580 DSCP_CS3 = 24, 581 DSCP_AF31 = 26, 582 DSCP_AF32 = 28, 583 DSCP_AF33 = 30, 584 DSCP_CS4 = 32, 585 DSCP_AF41 = 34, // Video 586 DSCP_AF42 = 36, // Video 587 DSCP_AF43 = 38, // Video 588 DSCP_CS5 = 40, // Video 589 DSCP_EF = 46, // Voice 590 DSCP_CS6 = 48, // Voice 591 DSCP_CS7 = 56, // Control messages 592}; 593 594} // namespace net 595 596#endif // NET_BASE_NET_UTIL_H_ 597