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/abi/linux/errqueue.go

@@ -0,0 +1,93 @@
+// Copyright 2020 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 linux
+
+import (
+	"github.com/sagernet/gvisor/pkg/marshal"
+)
+
+// Socket error origin codes as defined in include/uapi/linux/errqueue.h.
+const (
+	SO_EE_ORIGIN_NONE  = 0
+	SO_EE_ORIGIN_LOCAL = 1
+	SO_EE_ORIGIN_ICMP  = 2
+	SO_EE_ORIGIN_ICMP6 = 3
+)
+
+// SockExtendedErr represents struct sock_extended_err in Linux defined in
+// include/uapi/linux/errqueue.h.
+//
+// +marshal
+type SockExtendedErr struct {
+	Errno  uint32
+	Origin uint8
+	Type   uint8
+	Code   uint8
+	Pad    uint8
+	Info   uint32
+	Data   uint32
+}
+
+// SockErrCMsg represents the IP*_RECVERR control message.
+type SockErrCMsg interface {
+	marshal.Marshallable
+
+	CMsgLevel() uint32
+	CMsgType() uint32
+}
+
+// SockErrCMsgIPv4 is the IP_RECVERR control message used in
+// recvmsg(MSG_ERRQUEUE) by ipv4 sockets. This is equilavent to `struct errhdr`
+// defined in net/ipv4/ip_sockglue.c:ip_recv_error().
+//
+// +marshal
+type SockErrCMsgIPv4 struct {
+	SockExtendedErr
+	Offender SockAddrInet
+}
+
+var _ SockErrCMsg = (*SockErrCMsgIPv4)(nil)
+
+// CMsgLevel implements SockErrCMsg.CMsgLevel.
+func (*SockErrCMsgIPv4) CMsgLevel() uint32 {
+	return SOL_IP
+}
+
+// CMsgType implements SockErrCMsg.CMsgType.
+func (*SockErrCMsgIPv4) CMsgType() uint32 {
+	return IP_RECVERR
+}
+
+// SockErrCMsgIPv6 is the IPV6_RECVERR control message used in
+// recvmsg(MSG_ERRQUEUE) by ipv6 sockets. This is equilavent to `struct errhdr`
+// defined in net/ipv6/datagram.c:ipv6_recv_error().
+//
+// +marshal
+type SockErrCMsgIPv6 struct {
+	SockExtendedErr
+	Offender SockAddrInet6
+}
+
+var _ SockErrCMsg = (*SockErrCMsgIPv6)(nil)
+
+// CMsgLevel implements SockErrCMsg.CMsgLevel.
+func (*SockErrCMsgIPv6) CMsgLevel() uint32 {
+	return SOL_IPV6
+}
+
+// CMsgType implements SockErrCMsg.CMsgType.
+func (*SockErrCMsgIPv6) CMsgType() uint32 {
+	return IPV6_RECVERR
+}