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/netlink.go

@@ -0,0 +1,159 @@
+// Copyright 2018 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
+
+// Netlink protocols, from uapi/linux/netlink.h.
+const (
+	NETLINK_ROUTE          = 0
+	NETLINK_UNUSED         = 1
+	NETLINK_USERSOCK       = 2
+	NETLINK_FIREWALL       = 3
+	NETLINK_SOCK_DIAG      = 4
+	NETLINK_NFLOG          = 5
+	NETLINK_XFRM           = 6
+	NETLINK_SELINUX        = 7
+	NETLINK_ISCSI          = 8
+	NETLINK_AUDIT          = 9
+	NETLINK_FIB_LOOKUP     = 10
+	NETLINK_CONNECTOR      = 11
+	NETLINK_NETFILTER      = 12
+	NETLINK_IP6_FW         = 13
+	NETLINK_DNRTMSG        = 14
+	NETLINK_KOBJECT_UEVENT = 15
+	NETLINK_GENERIC        = 16
+	NETLINK_SCSITRANSPORT  = 18
+	NETLINK_ECRYPTFS       = 19
+	NETLINK_RDMA           = 20
+	NETLINK_CRYPTO         = 21
+)
+
+// SockAddrNetlink is struct sockaddr_nl, from uapi/linux/netlink.h.
+//
+// +marshal
+type SockAddrNetlink struct {
+	Family uint16
+	_      uint16
+	PortID uint32
+	Groups uint32
+}
+
+// SockAddrNetlinkSize is the size of SockAddrNetlink.
+const SockAddrNetlinkSize = 12
+
+// NetlinkMessageHeader is struct nlmsghdr, from uapi/linux/netlink.h.
+//
+// +marshal
+type NetlinkMessageHeader struct {
+	Length uint32
+	Type   uint16
+	Flags  uint16
+	Seq    uint32
+	PortID uint32
+}
+
+// NetlinkMessageHeaderSize is the size of NetlinkMessageHeader.
+const NetlinkMessageHeaderSize = 16
+
+// Netlink message header flag values, from uapi/linux/netlink.h.
+const (
+	NLM_F_REQUEST   = 0x1
+	NLM_F_MULTI     = 0x2
+	NLM_F_ACK       = 0x4
+	NLM_F_ECHO      = 0x8
+	NLM_F_DUMP_INTR = 0x10
+)
+
+// Netlink message header flags for GET requests, from uapi/linux/netlink.h.
+const (
+	NLM_F_ROOT   = 0x100
+	NLM_F_MATCH  = 0x200
+	NLM_F_ATOMIC = 0x400
+	NLM_F_DUMP   = NLM_F_ROOT | NLM_F_MATCH
+)
+
+// Netlink message header flags for NEW requests, from uapi/linux/netlink.h.
+const (
+	NLM_F_REPLACE = 0x100
+	NLM_F_EXCL    = 0x200
+	NLM_F_CREATE  = 0x400
+	NLM_F_APPEND  = 0x800
+)
+
+// Netlink message header flags for DELETE requests, from uapi/linux/netlink.h.
+const (
+	NLM_F_NONREC = 0x100
+	NLM_F_BULK   = 0x200
+)
+
+// Standard netlink message types, from uapi/linux/netlink.h.
+const (
+	NLMSG_NOOP    = 0x1
+	NLMSG_ERROR   = 0x2
+	NLMSG_DONE    = 0x3
+	NLMSG_OVERRUN = 0x4
+
+	// NLMSG_MIN_TYPE is the first value for protocol-level types.
+	NLMSG_MIN_TYPE = 0x10
+)
+
+// NLMSG_ALIGNTO is the alignment of netlink messages, from
+// uapi/linux/netlink.h.
+const NLMSG_ALIGNTO = 4
+
+// NetlinkAttrHeader is the header of a netlink attribute, followed by payload.
+//
+// This is struct nlattr, from uapi/linux/netlink.h.
+//
+// +marshal
+type NetlinkAttrHeader struct {
+	Length uint16
+	Type   uint16
+}
+
+// Netlink attribute flags, from uapi/linux/netlink.h.
+const (
+	NLA_F_NESTED        uint16 = 1 << 15
+	NLA_F_NET_BYTEORDER        = 1 << 14
+	NLA_TYPE_MASK              = ^(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
+)
+
+// NetlinkAttrHeaderSize is the size of NetlinkAttrHeader.
+const NetlinkAttrHeaderSize = 4
+
+// NLA_ALIGNTO is the alignment of netlink attributes, from
+// uapi/linux/netlink.h.
+const NLA_ALIGNTO = 4
+
+// Socket options, from uapi/linux/netlink.h.
+const (
+	NETLINK_ADD_MEMBERSHIP   = 1
+	NETLINK_DROP_MEMBERSHIP  = 2
+	NETLINK_PKTINFO          = 3
+	NETLINK_BROADCAST_ERROR  = 4
+	NETLINK_NO_ENOBUFS       = 5
+	NETLINK_LISTEN_ALL_NSID  = 8
+	NETLINK_LIST_MEMBERSHIPS = 9
+	NETLINK_CAP_ACK          = 10
+	NETLINK_EXT_ACK          = 11
+	NETLINK_DUMP_STRICT_CHK  = 12
+)
+
+// NetlinkErrorMessage is struct nlmsgerr, from uapi/linux/netlink.h.
+//
+// +marshal
+type NetlinkErrorMessage struct {
+	Error  int32
+	Header NetlinkMessageHeader
+}