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/ip.go

@@ -0,0 +1,171 @@
+// 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
+
+// IP protocols
+const (
+	IPPROTO_IP      = 0
+	IPPROTO_ICMP    = 1
+	IPPROTO_IGMP    = 2
+	IPPROTO_IPIP    = 4
+	IPPROTO_TCP     = 6
+	IPPROTO_EGP     = 8
+	IPPROTO_PUP     = 12
+	IPPROTO_UDP     = 17
+	IPPROTO_IDP     = 22
+	IPPROTO_TP      = 29
+	IPPROTO_DCCP    = 33
+	IPPROTO_IPV6    = 41
+	IPPROTO_RSVP    = 46
+	IPPROTO_GRE     = 47
+	IPPROTO_ESP     = 50
+	IPPROTO_AH      = 51
+	IPPROTO_ICMPV6  = 58
+	IPPROTO_MTP     = 92
+	IPPROTO_BEETPH  = 94
+	IPPROTO_ENCAP   = 98
+	IPPROTO_PIM     = 103
+	IPPROTO_COMP    = 108
+	IPPROTO_SCTP    = 132
+	IPPROTO_UDPLITE = 136
+	IPPROTO_MPLS    = 137
+	IPPROTO_RAW     = 255
+)
+
+// Socket options from uapi/linux/in.h
+const (
+	IP_TOS                    = 1
+	IP_TTL                    = 2
+	IP_HDRINCL                = 3
+	IP_OPTIONS                = 4
+	IP_ROUTER_ALERT           = 5
+	IP_RECVOPTS               = 6
+	IP_RETOPTS                = 7
+	IP_PKTINFO                = 8
+	IP_PKTOPTIONS             = 9
+	IP_MTU_DISCOVER           = 10
+	IP_RECVERR                = 11
+	IP_RECVTTL                = 12
+	IP_RECVTOS                = 13
+	IP_MTU                    = 14
+	IP_FREEBIND               = 15
+	IP_IPSEC_POLICY           = 16
+	IP_XFRM_POLICY            = 17
+	IP_PASSSEC                = 18
+	IP_TRANSPARENT            = 19
+	IP_ORIGDSTADDR            = 20
+	IP_RECVORIGDSTADDR        = IP_ORIGDSTADDR
+	IP_MINTTL                 = 21
+	IP_NODEFRAG               = 22
+	IP_CHECKSUM               = 23
+	IP_BIND_ADDRESS_NO_PORT   = 24
+	IP_RECVFRAGSIZE           = 25
+	IP_RECVERR_RFC4884        = 26
+	IP_MULTICAST_IF           = 32
+	IP_MULTICAST_TTL          = 33
+	IP_MULTICAST_LOOP         = 34
+	IP_ADD_MEMBERSHIP         = 35
+	IP_DROP_MEMBERSHIP        = 36
+	IP_UNBLOCK_SOURCE         = 37
+	IP_BLOCK_SOURCE           = 38
+	IP_ADD_SOURCE_MEMBERSHIP  = 39
+	IP_DROP_SOURCE_MEMBERSHIP = 40
+	IP_MSFILTER               = 41
+	MCAST_JOIN_GROUP          = 42
+	MCAST_BLOCK_SOURCE        = 43
+	MCAST_UNBLOCK_SOURCE      = 44
+	MCAST_LEAVE_GROUP         = 45
+	MCAST_JOIN_SOURCE_GROUP   = 46
+	MCAST_LEAVE_SOURCE_GROUP  = 47
+	MCAST_MSFILTER            = 48
+	IP_MULTICAST_ALL          = 49
+	IP_UNICAST_IF             = 50
+	IP_LOCAL_PORT_RANGE       = 51
+)
+
+// IP_MTU_DISCOVER values from uapi/linux/in.h
+const (
+	IP_PMTUDISC_DONT      = 0
+	IP_PMTUDISC_WANT      = 1
+	IP_PMTUDISC_DO        = 2
+	IP_PMTUDISC_PROBE     = 3
+	IP_PMTUDISC_INTERFACE = 4
+	IP_PMTUDISC_OMIT      = 5
+)
+
+// Socket options from uapi/linux/in6.h
+const (
+	IPV6_ADDRFORM             = 1
+	IPV6_2292PKTINFO          = 2
+	IPV6_2292HOPOPTS          = 3
+	IPV6_2292DSTOPTS          = 4
+	IPV6_2292RTHDR            = 5
+	IPV6_2292PKTOPTIONS       = 6
+	IPV6_CHECKSUM             = 7
+	IPV6_2292HOPLIMIT         = 8
+	IPV6_NEXTHOP              = 9
+	IPV6_FLOWINFO             = 11
+	IPV6_UNICAST_HOPS         = 16
+	IPV6_MULTICAST_IF         = 17
+	IPV6_MULTICAST_HOPS       = 18
+	IPV6_MULTICAST_LOOP       = 19
+	IPV6_ADD_MEMBERSHIP       = 20
+	IPV6_DROP_MEMBERSHIP      = 21
+	IPV6_ROUTER_ALERT         = 22
+	IPV6_MTU_DISCOVER         = 23
+	IPV6_MTU                  = 24
+	IPV6_RECVERR              = 25
+	IPV6_V6ONLY               = 26
+	IPV6_JOIN_ANYCAST         = 27
+	IPV6_LEAVE_ANYCAST        = 28
+	IPV6_MULTICAST_ALL        = 29
+	IPV6_ROUTER_ALERT_ISOLATE = 30
+	IPV6_RECVERR_RFC4884      = 31
+	IPV6_FLOWLABEL_MGR        = 32
+	IPV6_FLOWINFO_SEND        = 33
+	IPV6_IPSEC_POLICY         = 34
+	IPV6_XFRM_POLICY          = 35
+	IPV6_HDRINCL              = 36
+	IPV6_RECVPKTINFO          = 49
+	IPV6_PKTINFO              = 50
+	IPV6_RECVHOPLIMIT         = 51
+	IPV6_HOPLIMIT             = 52
+	IPV6_RECVHOPOPTS          = 53
+	IPV6_HOPOPTS              = 54
+	IPV6_RTHDRDSTOPTS         = 55
+	IPV6_RECVRTHDR            = 56
+	IPV6_RTHDR                = 57
+	IPV6_RECVDSTOPTS          = 58
+	IPV6_DSTOPTS              = 59
+	IPV6_RECVPATHMTU          = 60
+	IPV6_PATHMTU              = 61
+	IPV6_DONTFRAG             = 62
+	IPV6_RECVTCLASS           = 66
+	IPV6_TCLASS               = 67
+	IPV6_AUTOFLOWLABEL        = 70
+	IPV6_ADDR_PREFERENCES     = 72
+	IPV6_MINHOPCOUNT          = 73
+	IPV6_ORIGDSTADDR          = 74
+	IPV6_RECVORIGDSTADDR      = IPV6_ORIGDSTADDR
+	IPV6_TRANSPARENT          = 75
+	IPV6_UNICAST_IF           = 76
+	IPV6_RECVFRAGSIZE         = 77
+	IPV6_FREEBIND             = 78
+)
+
+// Socket options from uapi/linux/icmpv6.h
+const (
+	ICMPV6_FILTER = 1
+)