mirror of
https://github.com/fumiama/terasu-cloudflared.git
synced 2026-06-11 05:30:30 +08:00
96ce66bd30
## Summary Update several moving parts of cloudflared build system: * use goboring 1.24.2 in cfsetup * update linter and fix lint issues * update packages namely **quic-go and net** * install script for macos * update docker files to use go 1.24.1 * remove usage of cloudflare-go * pin golang linter Closes TUN-9016
58 lines
1.8 KiB
Go
58 lines
1.8 KiB
Go
package protocol
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// A PacketNumber in QUIC
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type PacketNumber int64
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// InvalidPacketNumber is a packet number that is never sent.
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// In QUIC, 0 is a valid packet number.
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const InvalidPacketNumber PacketNumber = -1
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// PacketNumberLen is the length of the packet number in bytes
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type PacketNumberLen uint8
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const (
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// PacketNumberLen1 is a packet number length of 1 byte
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PacketNumberLen1 PacketNumberLen = 1
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// PacketNumberLen2 is a packet number length of 2 bytes
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PacketNumberLen2 PacketNumberLen = 2
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// PacketNumberLen3 is a packet number length of 3 bytes
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PacketNumberLen3 PacketNumberLen = 3
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// PacketNumberLen4 is a packet number length of 4 bytes
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PacketNumberLen4 PacketNumberLen = 4
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)
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// DecodePacketNumber calculates the packet number based its length and the last seen packet number
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// This function is taken from https://www.rfc-editor.org/rfc/rfc9000.html#section-a.3.
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func DecodePacketNumber(length PacketNumberLen, largest PacketNumber, truncated PacketNumber) PacketNumber {
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expected := largest + 1
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win := PacketNumber(1 << (length * 8))
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hwin := win / 2
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mask := win - 1
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candidate := (expected & ^mask) | truncated
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if candidate <= expected-hwin && candidate < 1<<62-win {
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return candidate + win
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}
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if candidate > expected+hwin && candidate >= win {
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return candidate - win
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}
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return candidate
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}
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// PacketNumberLengthForHeader gets the length of the packet number for the public header
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// it never chooses a PacketNumberLen of 1 byte, since this is too short under certain circumstances
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func PacketNumberLengthForHeader(pn, largestAcked PacketNumber) PacketNumberLen {
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var numUnacked PacketNumber
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if largestAcked == InvalidPacketNumber {
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numUnacked = pn + 1
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} else {
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numUnacked = pn - largestAcked
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}
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if numUnacked < 1<<(16-1) {
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return PacketNumberLen2
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}
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if numUnacked < 1<<(24-1) {
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return PacketNumberLen3
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}
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return PacketNumberLen4
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}
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