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

pkg/tcpip/network/internal/ip/errors.go

@@ -0,0 +1,129 @@
+// Copyright 2021 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ip
+
+import (
+	"fmt"
+
+	"github.com/sagernet/gvisor/pkg/tcpip"
+)
+
+// ForwardingError represents an error that occurred while trying to forward
+// a packet.
+type ForwardingError interface {
+	isForwardingError()
+	fmt.Stringer
+}
+
+// ErrTTLExceeded indicates that the received packet's TTL has been exceeded.
+type ErrTTLExceeded struct{}
+
+func (*ErrTTLExceeded) isForwardingError() {}
+
+func (*ErrTTLExceeded) String() string { return "ttl exceeded" }
+
+// ErrOutgoingDeviceNoBufferSpace indicates that the outgoing device does not
+// have enough space to hold a buffer.
+type ErrOutgoingDeviceNoBufferSpace struct{}
+
+func (*ErrOutgoingDeviceNoBufferSpace) isForwardingError() {}
+
+func (*ErrOutgoingDeviceNoBufferSpace) String() string { return "no device buffer space" }
+
+// ErrParameterProblem indicates the received packet had a problem with an IP
+// parameter.
+type ErrParameterProblem struct{}
+
+func (*ErrParameterProblem) isForwardingError() {}
+
+func (*ErrParameterProblem) String() string { return "parameter problem" }
+
+// ErrInitializingSourceAddress indicates the received packet had a source
+// address that may only be used on the local network as part of initialization
+// work.
+type ErrInitializingSourceAddress struct{}
+
+func (*ErrInitializingSourceAddress) isForwardingError() {}
+
+func (*ErrInitializingSourceAddress) String() string { return "initializing source address" }
+
+// ErrLinkLocalSourceAddress indicates the received packet had a link-local
+// source address.
+type ErrLinkLocalSourceAddress struct{}
+
+func (*ErrLinkLocalSourceAddress) isForwardingError() {}
+
+func (*ErrLinkLocalSourceAddress) String() string { return "link local source address" }
+
+// ErrLinkLocalDestinationAddress indicates the received packet had a link-local
+// destination address.
+type ErrLinkLocalDestinationAddress struct{}
+
+func (*ErrLinkLocalDestinationAddress) isForwardingError() {}
+
+func (*ErrLinkLocalDestinationAddress) String() string { return "link local destination address" }
+
+// ErrHostUnreachable indicates that the destination host could not be reached.
+type ErrHostUnreachable struct{}
+
+func (*ErrHostUnreachable) isForwardingError() {}
+
+func (*ErrHostUnreachable) String() string { return "no route to host" }
+
+// ErrMessageTooLong indicates the packet was too big for the outgoing MTU.
+//
+// +stateify savable
+type ErrMessageTooLong struct{}
+
+func (*ErrMessageTooLong) isForwardingError() {}
+
+func (*ErrMessageTooLong) String() string { return "message too long" }
+
+// ErrNoMulticastPendingQueueBufferSpace indicates that a multicast packet
+// could not be added to the pending packet queue due to insufficient buffer
+// space.
+//
+// +stateify savable
+type ErrNoMulticastPendingQueueBufferSpace struct{}
+
+func (*ErrNoMulticastPendingQueueBufferSpace) isForwardingError() {}
+
+func (*ErrNoMulticastPendingQueueBufferSpace) String() string { return "no buffer space" }
+
+// ErrUnexpectedMulticastInputInterface indicates that the interface that the
+// packet arrived on did not match the routes expected input interface.
+type ErrUnexpectedMulticastInputInterface struct{}
+
+func (*ErrUnexpectedMulticastInputInterface) isForwardingError() {}
+
+func (*ErrUnexpectedMulticastInputInterface) String() string { return "unexpected input interface" }
+
+// ErrUnknownOutputEndpoint indicates that the output endpoint associated with
+// a route could not be found.
+type ErrUnknownOutputEndpoint struct{}
+
+func (*ErrUnknownOutputEndpoint) isForwardingError() {}
+
+func (*ErrUnknownOutputEndpoint) String() string { return "unknown endpoint" }
+
+// ErrOther indicates the packet coould not be forwarded for a reason
+// captured by the contained error.
+type ErrOther struct {
+	Err tcpip.Error
+}
+
+func (*ErrOther) isForwardingError() {}
+
+func (e *ErrOther) String() string { return fmt.Sprintf("other tcpip error: %s", e.Err) }