snapshot: sagernet/gvisor v0.0.0-20250811.0-sing-box-mod.1
Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для неё не нужна. Module path github.com/sagernet/gvisor сохранён намеренно: на него опирается replace-директива суперпроекта. Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show и переносилась на новый пин копированием. SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH
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204
pkg/tcpip/header/ndp_router_advert.go
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204
pkg/tcpip/header/ndp_router_advert.go
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// Copyright 2019 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 header
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import (
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"encoding/binary"
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"fmt"
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"time"
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)
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var _ fmt.Stringer = NDPRoutePreference(0)
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// NDPRoutePreference is the preference values for default routers or
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// more-specific routes.
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//
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// As per RFC 4191 section 2.1,
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//
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// Default router preferences and preferences for more-specific routes
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// are encoded the same way.
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//
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// Preference values are encoded as a two-bit signed integer, as
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// follows:
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//
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// 01 High
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// 00 Medium (default)
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// 11 Low
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// 10 Reserved - MUST NOT be sent
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//
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// Note that implementations can treat the value as a two-bit signed
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// integer.
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//
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// Having just three values reinforces that they are not metrics and
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// more values do not appear to be necessary for reasonable scenarios.
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type NDPRoutePreference uint8
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const (
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// HighRoutePreference indicates a high preference, as per
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// RFC 4191 section 2.1.
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HighRoutePreference NDPRoutePreference = 0b01
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// MediumRoutePreference indicates a medium preference, as per
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// RFC 4191 section 2.1.
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//
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// This is the default preference value.
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MediumRoutePreference = 0b00
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// LowRoutePreference indicates a low preference, as per
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// RFC 4191 section 2.1.
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LowRoutePreference = 0b11
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// ReservedRoutePreference is a reserved preference value, as per
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// RFC 4191 section 2.1.
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//
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// It MUST NOT be sent.
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ReservedRoutePreference = 0b10
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)
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// String implements fmt.Stringer.
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func (p NDPRoutePreference) String() string {
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switch p {
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case HighRoutePreference:
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return "HighRoutePreference"
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case MediumRoutePreference:
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return "MediumRoutePreference"
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case LowRoutePreference:
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return "LowRoutePreference"
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case ReservedRoutePreference:
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return "ReservedRoutePreference"
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default:
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return fmt.Sprintf("NDPRoutePreference(%d)", p)
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}
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}
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// NDPRouterAdvert is an NDP Router Advertisement message. It will only contain
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// the body of an ICMPv6 packet.
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//
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// See RFC 4861 section 4.2 and RFC 4191 section 2.2 for more details.
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type NDPRouterAdvert []byte
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// As per RFC 4191 section 2.2,
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//
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// 0 1 2 3
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// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Type | Code | Checksum |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Cur Hop Limit |M|O|H|Prf|Resvd| Router Lifetime |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Reachable Time |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Retrans Timer |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Options ...
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// +-+-+-+-+-+-+-+-+-+-+-+-
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const (
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// NDPRAMinimumSize is the minimum size of a valid NDP Router
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// Advertisement message (body of an ICMPv6 packet).
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NDPRAMinimumSize = 12
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// ndpRACurrHopLimitOffset is the byte of the Curr Hop Limit field
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// within an NDPRouterAdvert.
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ndpRACurrHopLimitOffset = 0
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// ndpRAFlagsOffset is the byte with the NDP RA bit-fields/flags
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// within an NDPRouterAdvert.
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ndpRAFlagsOffset = 1
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// ndpRAManagedAddrConfFlagMask is the mask of the Managed Address
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// Configuration flag within the bit-field/flags byte of an
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// NDPRouterAdvert.
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ndpRAManagedAddrConfFlagMask = (1 << 7)
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// ndpRAOtherConfFlagMask is the mask of the Other Configuration flag
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// within the bit-field/flags byte of an NDPRouterAdvert.
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ndpRAOtherConfFlagMask = (1 << 6)
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// ndpDefaultRouterPreferenceShift is the shift of the Prf (Default Router
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// Preference) field within the flags byte of an NDPRouterAdvert.
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ndpDefaultRouterPreferenceShift = 3
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// ndpDefaultRouterPreferenceMask is the mask of the Prf (Default Router
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// Preference) field within the flags byte of an NDPRouterAdvert.
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ndpDefaultRouterPreferenceMask = (0b11 << ndpDefaultRouterPreferenceShift)
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// ndpRARouterLifetimeOffset is the start of the 2-byte Router Lifetime
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// field within an NDPRouterAdvert.
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ndpRARouterLifetimeOffset = 2
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// ndpRAReachableTimeOffset is the start of the 4-byte Reachable Time
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// field within an NDPRouterAdvert.
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ndpRAReachableTimeOffset = 4
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// ndpRARetransTimerOffset is the start of the 4-byte Retrans Timer
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// field within an NDPRouterAdvert.
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ndpRARetransTimerOffset = 8
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// ndpRAOptionsOffset is the start of the NDP options in an
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// NDPRouterAdvert.
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ndpRAOptionsOffset = 12
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)
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// CurrHopLimit returns the value of the Curr Hop Limit field.
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func (b NDPRouterAdvert) CurrHopLimit() uint8 {
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return b[ndpRACurrHopLimitOffset]
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}
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// ManagedAddrConfFlag returns the value of the Managed Address Configuration
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// flag.
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func (b NDPRouterAdvert) ManagedAddrConfFlag() bool {
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return b[ndpRAFlagsOffset]&ndpRAManagedAddrConfFlagMask != 0
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}
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// OtherConfFlag returns the value of the Other Configuration flag.
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func (b NDPRouterAdvert) OtherConfFlag() bool {
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return b[ndpRAFlagsOffset]&ndpRAOtherConfFlagMask != 0
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}
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// DefaultRouterPreference returns the Default Router Preference field.
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func (b NDPRouterAdvert) DefaultRouterPreference() NDPRoutePreference {
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return NDPRoutePreference((b[ndpRAFlagsOffset] & ndpDefaultRouterPreferenceMask) >> ndpDefaultRouterPreferenceShift)
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}
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// RouterLifetime returns the lifetime associated with the default router. A
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// value of 0 means the source of the Router Advertisement is not a default
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// router and SHOULD NOT appear on the default router list. Note, a value of 0
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// only means that the router should not be used as a default router, it does
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// not apply to other information contained in the Router Advertisement.
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func (b NDPRouterAdvert) RouterLifetime() time.Duration {
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// The field is the time in seconds, as per RFC 4861 section 4.2.
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return time.Second * time.Duration(binary.BigEndian.Uint16(b[ndpRARouterLifetimeOffset:]))
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}
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// ReachableTime returns the time that a node assumes a neighbor is reachable
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// after having received a reachability confirmation. A value of 0 means
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// that it is unspecified by the source of the Router Advertisement message.
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func (b NDPRouterAdvert) ReachableTime() time.Duration {
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// The field is the time in milliseconds, as per RFC 4861 section 4.2.
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return time.Millisecond * time.Duration(binary.BigEndian.Uint32(b[ndpRAReachableTimeOffset:]))
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}
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// RetransTimer returns the time between retransmitted Neighbor Solicitation
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// messages. A value of 0 means that it is unspecified by the source of the
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// Router Advertisement message.
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func (b NDPRouterAdvert) RetransTimer() time.Duration {
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// The field is the time in milliseconds, as per RFC 4861 section 4.2.
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return time.Millisecond * time.Duration(binary.BigEndian.Uint32(b[ndpRARetransTimerOffset:]))
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}
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// Options returns an NDPOptions of the options body.
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func (b NDPRouterAdvert) Options() NDPOptions {
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return NDPOptions(b[ndpRAOptionsOffset:])
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}
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