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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_HTTP2_HTTP2_STRUCTURES_H_
#define NET_HTTP2_HTTP2_STRUCTURES_H_
// Defines structs for various fixed sized structures in HTTP/2.
//
// Those structs with multiple fields have constructors that take arguments in
// the same order as their encoding (which may be different from their order
// in the struct). For single field structs, use aggregate initialization if
// desired, e.g.:
//
// Http2RstStreamFields var{Http2ErrorCode::ENHANCE_YOUR_CALM};
// or:
// SomeFunc(Http2RstStreamFields{Http2ErrorCode::ENHANCE_YOUR_CALM});
//
// Each struct includes a static method EncodedSize which returns the number
// of bytes of the encoding.
//
// With the exception of Http2FrameHeader, all the types are named
// Http2<X>Fields, where X is the title-case form of the frame which always
// includes the fields; the "always" is to cover the case of the PRIORITY frame;
// its fields optionally appear in the HEADERS frame, but the struct is called
// Http2PriorityFields.
#include <stddef.h>
#include <stdint.h>
#include <ostream>
#include "base/logging.h"
#include "net/http2/http2_constants.h"
#include "net/http2/platform/api/http2_export.h"
#include "net/http2/platform/api/http2_string.h"
namespace net {
struct HTTP2_EXPORT_PRIVATE Http2FrameHeader {
Http2FrameHeader() {}
Http2FrameHeader(uint32_t payload_length,
Http2FrameType type,
uint8_t flags,
uint32_t stream_id)
: payload_length(payload_length),
stream_id(stream_id),
type(type),
flags(static_cast<Http2FrameFlag>(flags)) {
DCHECK_LT(payload_length, static_cast<uint32_t>(1 << 24))
<< "Payload Length is only a 24 bit field\n"
<< ToString();
}
static constexpr size_t EncodedSize() { return 9; }
// Keep the current value of those flags that are in
// valid_flags, and clear all the others.
void RetainFlags(uint8_t valid_flags) {
flags = static_cast<Http2FrameFlag>(flags & valid_flags);
}
// Returns true if any of the flags in flag_mask are set,
// otherwise false.
bool HasAnyFlags(uint8_t flag_mask) const { return 0 != (flags & flag_mask); }
// Is the END_STREAM flag set?
bool IsEndStream() const {
DCHECK(type == Http2FrameType::DATA || type == Http2FrameType::HEADERS)
<< ToString();
return (flags & Http2FrameFlag::END_STREAM) != 0;
}
// Is the ACK flag set?
bool IsAck() const {
DCHECK(type == Http2FrameType::SETTINGS || type == Http2FrameType::PING)
<< ToString();
return (flags & Http2FrameFlag::ACK) != 0;
}
// Is the END_HEADERS flag set?
bool IsEndHeaders() const {
DCHECK(type == Http2FrameType::HEADERS ||
type == Http2FrameType::PUSH_PROMISE ||
type == Http2FrameType::CONTINUATION)
<< ToString();
return (flags & Http2FrameFlag::END_HEADERS) != 0;
}
// Is the PADDED flag set?
bool IsPadded() const {
DCHECK(type == Http2FrameType::DATA || type == Http2FrameType::HEADERS ||
type == Http2FrameType::PUSH_PROMISE)
<< ToString();
return (flags & Http2FrameFlag::PADDED) != 0;
}
// Is the PRIORITY flag set?
bool HasPriority() const {
DCHECK_EQ(type, Http2FrameType::HEADERS) << ToString();
return (flags & Http2FrameFlag::PRIORITY) != 0;
}
// Does the encoding of this header start with "HTTP/", indicating that it
// might be from a non-HTTP/2 server.
bool IsProbableHttpResponse() const;
// Produce strings useful for debugging/logging messages.
Http2String ToString() const;
Http2String FlagsToString() const;
// 24 bit length of the payload after the header, including any padding.
// First field in encoding.
uint32_t payload_length; // 24 bits
// 31 bit stream id, with high bit (32nd bit) reserved (must be zero),
// and is cleared during decoding.
// Fourth field in encoding.
uint32_t stream_id;
// Type of the frame.
// Second field in encoding.
Http2FrameType type;
// Flag bits, with interpretations that depend upon the frame type.
// Flag bits not used by the frame type are cleared.
// Third field in encoding.
Http2FrameFlag flags;
};
HTTP2_EXPORT_PRIVATE bool operator==(const Http2FrameHeader& a,
const Http2FrameHeader& b);
HTTP2_EXPORT_PRIVATE inline bool operator!=(const Http2FrameHeader& a,
const Http2FrameHeader& b) {
return !(a == b);
}
HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
const Http2FrameHeader& v);
// Http2PriorityFields:
struct HTTP2_EXPORT_PRIVATE Http2PriorityFields {
Http2PriorityFields() {}
Http2PriorityFields(uint32_t stream_dependency,
uint32_t weight,
bool is_exclusive)
: stream_dependency(stream_dependency),
weight(weight),
is_exclusive(is_exclusive) {
// Can't have the high-bit set in the stream id because we need to use
// that for the EXCLUSIVE flag bit.
DCHECK_EQ(stream_dependency, stream_dependency & StreamIdMask())
<< "Stream Dependency is only a 31-bit field.\n"
<< ToString();
DCHECK_LE(1u, weight) << "Weight is too small.";
DCHECK_LE(weight, 256u) << "Weight is too large.";
}
static constexpr size_t EncodedSize() { return 5; }
// Produce strings useful for debugging/logging messages.
Http2String ToString() const;
// A 31-bit stream identifier for the stream that this stream depends on.
uint32_t stream_dependency;
// Weight (1 to 256) is encoded as a byte in the range 0 to 255, so we
// add one when decoding, and store it in a field larger than a byte.
uint32_t weight;
// A single-bit flag indicating that the stream dependency is exclusive;
// extracted from high bit of stream dependency field during decoding.
bool is_exclusive;
};
HTTP2_EXPORT_PRIVATE bool operator==(const Http2PriorityFields& a,
const Http2PriorityFields& b);
HTTP2_EXPORT_PRIVATE inline bool operator!=(const Http2PriorityFields& a,
const Http2PriorityFields& b) {
return !(a == b);
}
HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
const Http2PriorityFields& v);
// Http2RstStreamFields:
struct Http2RstStreamFields {
static constexpr size_t EncodedSize() { return 4; }
bool IsSupportedErrorCode() const {
return IsSupportedHttp2ErrorCode(error_code);
}
Http2ErrorCode error_code;
};
HTTP2_EXPORT_PRIVATE bool operator==(const Http2RstStreamFields& a,
const Http2RstStreamFields& b);
HTTP2_EXPORT_PRIVATE inline bool operator!=(const Http2RstStreamFields& a,
const Http2RstStreamFields& b) {
return !(a == b);
}
HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
const Http2RstStreamFields& v);
// Http2SettingFields:
struct Http2SettingFields {
Http2SettingFields() {}
Http2SettingFields(Http2SettingsParameter parameter, uint32_t value)
: parameter(parameter), value(value) {}
static constexpr size_t EncodedSize() { return 6; }
bool IsSupportedParameter() const {
return IsSupportedHttp2SettingsParameter(parameter);
}
Http2SettingsParameter parameter;
uint32_t value;
};
HTTP2_EXPORT_PRIVATE bool operator==(const Http2SettingFields& a,
const Http2SettingFields& b);
HTTP2_EXPORT_PRIVATE inline bool operator!=(const Http2SettingFields& a,
const Http2SettingFields& b) {
return !(a == b);
}
HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
const Http2SettingFields& v);
// Http2PushPromiseFields:
struct Http2PushPromiseFields {
static constexpr size_t EncodedSize() { return 4; }
uint32_t promised_stream_id;
};
HTTP2_EXPORT_PRIVATE bool operator==(const Http2PushPromiseFields& a,
const Http2PushPromiseFields& b);
HTTP2_EXPORT_PRIVATE inline bool operator!=(const Http2PushPromiseFields& a,
const Http2PushPromiseFields& b) {
return !(a == b);
}
HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
const Http2PushPromiseFields& v);
// Http2PingFields:
struct Http2PingFields {
static constexpr size_t EncodedSize() { return 8; }
uint8_t opaque_bytes[8];
};
HTTP2_EXPORT_PRIVATE bool operator==(const Http2PingFields& a,
const Http2PingFields& b);
HTTP2_EXPORT_PRIVATE inline bool operator!=(const Http2PingFields& a,
const Http2PingFields& b) {
return !(a == b);
}
HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
const Http2PingFields& v);
// Http2GoAwayFields:
struct Http2GoAwayFields {
Http2GoAwayFields() {}
Http2GoAwayFields(uint32_t last_stream_id, Http2ErrorCode error_code)
: last_stream_id(last_stream_id), error_code(error_code) {}
static constexpr size_t EncodedSize() { return 8; }
bool IsSupportedErrorCode() const {
return IsSupportedHttp2ErrorCode(error_code);
}
uint32_t last_stream_id;
Http2ErrorCode error_code;
};
HTTP2_EXPORT_PRIVATE bool operator==(const Http2GoAwayFields& a,
const Http2GoAwayFields& b);
HTTP2_EXPORT_PRIVATE inline bool operator!=(const Http2GoAwayFields& a,
const Http2GoAwayFields& b) {
return !(a == b);
}
HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
const Http2GoAwayFields& v);
// Http2WindowUpdateFields:
struct Http2WindowUpdateFields {
static constexpr size_t EncodedSize() { return 4; }
// 31-bit, unsigned increase in the window size (only positive values are
// allowed). The high-bit is reserved for the future.
uint32_t window_size_increment;
};
HTTP2_EXPORT_PRIVATE bool operator==(const Http2WindowUpdateFields& a,
const Http2WindowUpdateFields& b);
HTTP2_EXPORT_PRIVATE inline bool operator!=(const Http2WindowUpdateFields& a,
const Http2WindowUpdateFields& b) {
return !(a == b);
}
HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
const Http2WindowUpdateFields& v);
// Http2AltSvcFields:
struct Http2AltSvcFields {
static constexpr size_t EncodedSize() { return 2; }
// This is the one fixed size portion of the ALTSVC payload.
uint16_t origin_length;
};
HTTP2_EXPORT_PRIVATE bool operator==(const Http2AltSvcFields& a,
const Http2AltSvcFields& b);
HTTP2_EXPORT_PRIVATE inline bool operator!=(const Http2AltSvcFields& a,
const Http2AltSvcFields& b) {
return !(a == b);
}
HTTP2_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out,
const Http2AltSvcFields& v);
} // namespace net
#endif // NET_HTTP2_HTTP2_STRUCTURES_H_