117243aa02
Обновление снапшота с v0.0.0-20250811.0 на пин, которого требует sing-box после мержа 235 коммитов (upstream d620bbbf2 "Update gvisor to 20260727.0"). Прежний снапшот был взят 2026-08-04 ровно с той версии, на которой тогда стоял апстрим; разрыв возник 2026-08-05 вместе с его бампом. За год апстрим-gvisor изменил ~14 000 строк в 292 файлах. Значимое для нас — сетевой стек: tcp/connect.go (PMTU-discovery + исправление начального RTT/RTO: раньше задержка ACK внутри стека завышала стартовый таймаут на несколько RTT), tcp/snd.go, tcp/rcv.go, stack/conntrack.go, stack/packet_buffer.go. Всего 30 файлов в TCP и 37 в stack. Баг SPEC 048 апстрим НЕ исправил — проверено по коду новой версии: handleConnecting по-прежнему проверяет состояние endpoint'а, но не ep.h, а performHandshake так же зануляет h и отпускает мьютекс до Close(). Поэтому guard перенесён (12 строк) вместе со своим тестом (45 строк). Red/green проверен на новой базе: без guard'а тест падает с той же nil-паникой, что в полевом крашдампе; с ним зелёный.
347 lines
8.2 KiB
Go
347 lines
8.2 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package linux
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import (
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"structs"
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)
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const (
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// NumControlCharacters is the number of control characters in Termios.
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NumControlCharacters = 19
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// disabledChar is used to indicate that a control character is
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// disabled.
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disabledChar = 0
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)
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// Winsize is struct winsize, defined in uapi/asm-generic/termios.h.
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//
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// +stateify savable
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// +marshal
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type Winsize struct {
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_ structs.HostLayout
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Row uint16
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Col uint16
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Xpixel uint16
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Ypixel uint16
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}
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// Termios is struct termios, defined in uapi/asm-generic/termbits.h.
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//
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// +marshal
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type Termios struct {
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_ structs.HostLayout
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InputFlags uint32
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OutputFlags uint32
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ControlFlags uint32
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LocalFlags uint32
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LineDiscipline uint8
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ControlCharacters [NumControlCharacters]uint8
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}
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// KernelTermios is struct ktermios/struct termios2, defined in
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// uapi/asm-generic/termbits.h.
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//
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// +stateify savable
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// +marshal
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type KernelTermios struct {
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_ structs.HostLayout
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InputFlags uint32
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OutputFlags uint32
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ControlFlags uint32
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LocalFlags uint32
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LineDiscipline uint8
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ControlCharacters [NumControlCharacters]uint8
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InputSpeed uint32
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OutputSpeed uint32
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}
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// IEnabled returns whether flag is enabled in termios input flags.
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func (t *KernelTermios) IEnabled(flag uint32) bool {
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return t.InputFlags&flag == flag
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}
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// OEnabled returns whether flag is enabled in termios output flags.
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func (t *KernelTermios) OEnabled(flag uint32) bool {
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return t.OutputFlags&flag == flag
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}
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// CEnabled returns whether flag is enabled in termios control flags.
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func (t *KernelTermios) CEnabled(flag uint32) bool {
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return t.ControlFlags&flag == flag
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}
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// LEnabled returns whether flag is enabled in termios local flags.
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func (t *KernelTermios) LEnabled(flag uint32) bool {
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return t.LocalFlags&flag == flag
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}
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// ToTermios copies fields that are shared with Termios into a new Termios
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// struct.
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func (t *KernelTermios) ToTermios() Termios {
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return Termios{
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InputFlags: t.InputFlags,
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OutputFlags: t.OutputFlags,
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ControlFlags: t.ControlFlags,
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LocalFlags: t.LocalFlags,
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LineDiscipline: t.LineDiscipline,
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ControlCharacters: t.ControlCharacters,
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}
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}
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// FromTermios copies fields that are shared with Termios into this
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// KernelTermios struct.
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func (t *KernelTermios) FromTermios(term Termios) {
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t.InputFlags = term.InputFlags
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t.OutputFlags = term.OutputFlags
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t.ControlFlags = term.ControlFlags
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t.LocalFlags = term.LocalFlags
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t.LineDiscipline = term.LineDiscipline
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t.ControlCharacters = term.ControlCharacters
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}
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// IsTerminating returns whether c is a line terminating character.
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func (t *KernelTermios) IsTerminating(cBytes []byte) bool {
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// All terminating characters are 1 byte.
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if len(cBytes) != 1 {
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return false
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}
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c := cBytes[0]
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// Is this the user-set EOF character?
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if t.IsEOF(c) {
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return true
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}
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switch c {
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case disabledChar:
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return false
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case '\n', t.ControlCharacters[VEOL]:
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return true
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case t.ControlCharacters[VEOL2]:
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return t.LEnabled(IEXTEN)
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}
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return false
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}
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// IsEOF returns whether c is the EOF character.
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func (t *KernelTermios) IsEOF(c byte) bool {
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return c == t.ControlCharacters[VEOF] && t.ControlCharacters[VEOF] != disabledChar
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}
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// Input flags.
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const (
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IGNBRK = 0o000001
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BRKINT = 0o000002
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IGNPAR = 0o000004
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PARMRK = 0o000010
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INPCK = 0o000020
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ISTRIP = 0o000040
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INLCR = 0o000100
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IGNCR = 0o000200
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ICRNL = 0o000400
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IUCLC = 0o001000
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IXON = 0o002000
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IXANY = 0o004000
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IXOFF = 0o010000
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IMAXBEL = 0o020000
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IUTF8 = 0o040000
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)
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// Output flags.
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const (
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OPOST = 0o000001
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OLCUC = 0o000002
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ONLCR = 0o000004
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OCRNL = 0o000010
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ONOCR = 0o000020
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ONLRET = 0o000040
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OFILL = 0o000100
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OFDEL = 0o000200
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NLDLY = 0o000400
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NL0 = 0o000000
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NL1 = 0o000400
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CRDLY = 0o003000
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CR0 = 0o000000
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CR1 = 0o001000
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CR2 = 0o002000
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CR3 = 0o003000
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TABDLY = 0o014000
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TAB0 = 0o000000
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TAB1 = 0o004000
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TAB2 = 0o010000
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TAB3 = 0o014000
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XTABS = 0o014000
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BSDLY = 0o020000
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BS0 = 0o000000
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BS1 = 0o020000
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VTDLY = 0o040000
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VT0 = 0o000000
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VT1 = 0o040000
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FFDLY = 0o100000
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FF0 = 0o000000
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FF1 = 0o100000
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)
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// Control flags.
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const (
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CBAUD = 0o010017
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B0 = 0o000000
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B50 = 0o000001
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B75 = 0o000002
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B110 = 0o000003
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B134 = 0o000004
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B150 = 0o000005
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B200 = 0o000006
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B300 = 0o000007
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B600 = 0o000010
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B1200 = 0o000011
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B1800 = 0o000012
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B2400 = 0o000013
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B4800 = 0o000014
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B9600 = 0o000015
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B19200 = 0o000016
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B38400 = 0o000017
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EXTA = B19200
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EXTB = B38400
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CSIZE = 0o000060
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CS5 = 0o000000
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CS6 = 0o000020
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CS7 = 0o000040
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CS8 = 0o000060
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CSTOPB = 0o000100
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CREAD = 0o000200
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PARENB = 0o000400
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PARODD = 0o001000
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HUPCL = 0o002000
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CLOCAL = 0o004000
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CBAUDEX = 0o010000
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BOTHER = 0o010000
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B57600 = 0o010001
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B115200 = 0o010002
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B230400 = 0o010003
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B460800 = 0o010004
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B500000 = 0o010005
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B576000 = 0o010006
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B921600 = 0o010007
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B1000000 = 0o010010
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B1152000 = 0o010011
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B1500000 = 0o010012
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B2000000 = 0o010013
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B2500000 = 0o010014
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B3000000 = 0o010015
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B3500000 = 0o010016
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B4000000 = 0o010017
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CIBAUD = 0o02003600000
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CMSPAR = 0o10000000000
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CRTSCTS = 0o20000000000
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// IBSHIFT is the shift from CBAUD to CIBAUD.
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IBSHIFT = 16
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)
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// Local flags.
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const (
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ISIG = 0o000001
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ICANON = 0o000002
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XCASE = 0o000004
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ECHO = 0o000010
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ECHOE = 0o000020
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ECHOK = 0o000040
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ECHONL = 0o000100
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NOFLSH = 0o000200
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TOSTOP = 0o000400
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ECHOCTL = 0o001000
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ECHOPRT = 0o002000
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ECHOKE = 0o004000
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FLUSHO = 0o010000
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PENDIN = 0o040000
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IEXTEN = 0o100000
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EXTPROC = 0o200000
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)
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// Control Character indices.
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const (
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VINTR = 0
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VQUIT = 1
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VERASE = 2
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VKILL = 3
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VEOF = 4
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VTIME = 5
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VMIN = 6
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VSWTC = 7
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VSTART = 8
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VSTOP = 9
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VSUSP = 10
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VEOL = 11
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VREPRINT = 12
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VDISCARD = 13
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VWERASE = 14
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VLNEXT = 15
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VEOL2 = 16
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)
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// ControlCharacter returns the termios-style control character for the passed
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// character.
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//
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// e.g., for Ctrl-C, i.e., ^C, call ControlCharacter('C').
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//
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// Standard control characters are ASCII bytes 0 through 31.
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func ControlCharacter(c byte) uint8 {
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// A is 1, B is 2, etc.
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return uint8(c - 'A' + 1)
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}
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// DefaultControlCharacters is the default set of Termios control characters.
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var DefaultControlCharacters = [NumControlCharacters]uint8{
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ControlCharacter('C'), // VINTR = ^C
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ControlCharacter('\\'), // VQUIT = ^\
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'\x7f', // VERASE = DEL
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ControlCharacter('U'), // VKILL = ^U
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ControlCharacter('D'), // VEOF = ^D
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0, // VTIME
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1, // VMIN
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0, // VSWTC
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ControlCharacter('Q'), // VSTART = ^Q
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ControlCharacter('S'), // VSTOP = ^S
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ControlCharacter('Z'), // VSUSP = ^Z
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0, // VEOL
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ControlCharacter('R'), // VREPRINT = ^R
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ControlCharacter('O'), // VDISCARD = ^O
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ControlCharacter('W'), // VWERASE = ^W
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ControlCharacter('V'), // VLNEXT = ^V
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0, // VEOL2
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}
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// MasterTermios is the terminal configuration of the master end of a Unix98
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// pseudoterminal.
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var MasterTermios = KernelTermios{
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ControlFlags: B38400 | CS8 | CREAD,
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ControlCharacters: DefaultControlCharacters,
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InputSpeed: 38400,
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OutputSpeed: 38400,
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}
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// DefaultReplicaTermios is the default terminal configuration of the replica
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// end of a Unix98 pseudoterminal.
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var DefaultReplicaTermios = KernelTermios{
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InputFlags: ICRNL | IXON,
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OutputFlags: OPOST | ONLCR,
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ControlFlags: B38400 | CS8 | CREAD,
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LocalFlags: ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN,
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ControlCharacters: DefaultControlCharacters,
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InputSpeed: 38400,
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OutputSpeed: 38400,
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}
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