From 72e783660b61782ea4a27201aedbd47d7f181a95 Mon Sep 17 00:00:00 2001
From: Matt Layher <mlayher@fastly.com>
Date: Wed, 18 Nov 2020 15:19:39 -0500
Subject: [PATCH 1/4] go.mod: bump x/ dependencies for MPLS constants

Signed-off-by: Matt Layher <mlayher@fastly.com>
---
 go.mod | 3 ++-
 go.sum | 7 +++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/go.mod b/go.mod
index 9e5e712..e4adbbb 100644
--- a/go.mod
+++ b/go.mod
@@ -5,5 +5,6 @@ go 1.12
 require (
 	github.com/google/go-cmp v0.5.3
 	github.com/mdlayher/netlink v1.1.1
-	golang.org/x/sys v0.0.0-20201101102859-da207088b7d1
+	golang.org/x/net v0.0.0-20201110031124-69a78807bb2b // indirect
+	golang.org/x/sys v0.0.0-20201118182958-a01c418693c7
 )
diff --git a/go.sum b/go.sum
index 05b7933..e30d544 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,7 @@ github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.3 h1:x95R7cp+rSeeqAMI2knLtQ0DKlaBhv2NrtrOvafPHRo=
 github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/jsimonetti/rtnetlink v0.0.0-20190606172950-9527aa82566a/go.mod h1:Oz+70psSo5OFh8DBl0Zv2ACw7Esh6pPUphlvZG9x7uw=
 github.com/jsimonetti/rtnetlink v0.0.0-20200117123717-f846d4f6c1f4/go.mod h1:WGuG/smIU4J/54PblvSbh+xvCZmpJnFgr3ds6Z55XMQ=
@@ -24,6 +25,8 @@ golang.org/x/net v0.0.0-20200202094626-16171245cfb2 h1:CCH4IOTTfewWjGOlSp+zGcjut
 golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20201010224723-4f7140c49acb h1:mUVeFHoDKis5nxCAzoAi7E8Ghb86EXh/RK6wtvJIqRY=
 golang.org/x/net v0.0.0-20201010224723-4f7140c49acb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.0.0-20201110031124-69a78807bb2b h1:uwuIcX0g4Yl1NC5XAz37xsr2lTtcqevgzYNVt49waME=
+golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190411185658-b44545bcd369/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -35,8 +38,8 @@ golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634 h1:bNEHhJCnrwMKNMmOx3yAynp5vs5/gRy+XWFtZFu7NBM=
 golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201101102859-da207088b7d1 h1:a/mKvvZr9Jcc8oKfcmgzyp7OwF73JPWsQLvH1z2Kxck=
-golang.org/x/sys v0.0.0-20201101102859-da207088b7d1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201118182958-a01c418693c7 h1:Z991aAXPjz0tLnj74pVXW3eWJ5lHMIBvbRfMq4M2jHA=
+golang.org/x/sys v0.0.0-20201118182958-a01c418693c7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

From 057ddd1f37f818ec894f21380084cd70e1bbaf43 Mon Sep 17 00:00:00 2001
From: Matt Layher <mlayher@fastly.com>
Date: Wed, 18 Nov 2020 15:26:31 -0500
Subject: [PATCH 2/4] rtnetlink: implement MPLSNextHop encoding and decoding

Signed-off-by: Matt Layher <mlayher@fastly.com>
---
 internal/unix/types_linux.go |   5 ++
 route.go                     | 126 +++++++++++++++++++++++++++++++++--
 route_test.go                |  90 +++++++++++++++++++++++++
 3 files changed, 216 insertions(+), 5 deletions(-)

diff --git a/internal/unix/types_linux.go b/internal/unix/types_linux.go
index 52b1a7d..9c747ad 100644
--- a/internal/unix/types_linux.go
+++ b/internal/unix/types_linux.go
@@ -65,6 +65,9 @@ const (
 	IFLA_XDP_FLAGS       = linux.IFLA_XDP_FLAGS
 	IFLA_XDP_PROG_ID     = linux.IFLA_XDP_PROG_ID
 	IFLA_XDP_EXPECTED_FD = linux.IFLA_XDP_EXPECTED_FD
+	LWTUNNEL_ENCAP_MPLS  = linux.LWTUNNEL_ENCAP_MPLS
+	MPLS_IPTUNNEL_DST    = linux.MPLS_IPTUNNEL_DST
+	MPLS_IPTUNNEL_TTL    = linux.MPLS_IPTUNNEL_TTL
 	NDA_UNSPEC           = linux.NDA_UNSPEC
 	NDA_DST              = linux.NDA_DST
 	NDA_LLADDR           = linux.NDA_LLADDR
@@ -72,6 +75,8 @@ const (
 	NDA_IFINDEX          = linux.NDA_IFINDEX
 	RTA_UNSPEC           = linux.RTA_UNSPEC
 	RTA_DST              = linux.RTA_DST
+	RTA_ENCAP            = linux.RTA_ENCAP
+	RTA_ENCAP_TYPE       = linux.RTA_ENCAP_TYPE
 	RTA_PREFSRC          = linux.RTA_PREFSRC
 	RTA_GATEWAY          = linux.RTA_GATEWAY
 	RTA_OIF              = linux.RTA_OIF
diff --git a/route.go b/route.go
index 7be1885..4eaf2f0 100644
--- a/route.go
+++ b/route.go
@@ -1,6 +1,7 @@
 package rtnetlink
 
 import (
+	"encoding/binary"
 	"errors"
 	"net"
 	"unsafe"
@@ -348,8 +349,9 @@ type RTNextHop struct {
 
 // NextHop wraps struct rtnexthop to provide access to nested attributes
 type NextHop struct {
-	Hop     RTNextHop // a rtnexthop struct
-	Gateway net.IP    // that struct's nested Gateway attribute
+	Hop     RTNextHop     // a rtnexthop struct
+	Gateway net.IP        // that struct's nested Gateway attribute
+	MPLS    []MPLSNextHop // Any MPLS next hops for a route.
 }
 
 func (a *RouteAttributes) encodeMultipath() ([]byte, error) {
@@ -359,11 +361,18 @@ func (a *RouteAttributes) encodeMultipath() ([]byte, error) {
 		// compute the length of each (rtnexthop, attributes) pair.
 		ae := netlink.NewAttributeEncoder()
 
-		if a.Gateway != nil {
+		if nh.Gateway != nil {
 			// TODO(mdlayher): more validation.
 			ae.Bytes(unix.RTA_GATEWAY, nh.Gateway)
 		}
 
+		if len(nh.MPLS) > 0 {
+			// TODO(mdlayher): validation over different encapsulation types,
+			// and ensure that only one can be set.
+			ae.Uint16(unix.RTA_ENCAP_TYPE, unix.LWTUNNEL_ENCAP_MPLS)
+			ae.Nested(unix.RTA_ENCAP, nh.encodeEncap)
+		}
+
 		ab, err := ae.Encode()
 		if err != nil {
 			return nil, err
@@ -417,16 +426,26 @@ func (a *RouteAttributes) parseMultipath(b []byte) error {
 	return mpp.Err()
 }
 
-// rtnexthop payload is at least one nested attribute RTA_GATEWAY
-// possibly others?
+// decode decodes netlink attribute values into a NextHop.
 func (nh *NextHop) decode(ad *netlink.AttributeDecoder) error {
 	if ad == nil {
 		// Invalid decoder, do nothing.
 		return nil
 	}
 
+	// If encapsulation is present, we won't know how to deal with it until we
+	// identify the right type and then later parse the nested attribute bytes.
+	var (
+		encapType uint16
+		encapBuf  []byte
+	)
+
 	for ad.Next() {
 		switch ad.Type() {
+		case unix.RTA_ENCAP:
+			encapBuf = ad.Bytes()
+		case unix.RTA_ENCAP_TYPE:
+			encapType = ad.Uint16()
 		case unix.RTA_GATEWAY:
 			l := len(ad.Bytes())
 			if l != 4 && l != 16 {
@@ -437,6 +456,103 @@ func (nh *NextHop) decode(ad *netlink.AttributeDecoder) error {
 		}
 	}
 
+	if err := ad.Err(); err != nil {
+		return err
+	}
+
+	if encapType != 0 && encapBuf != nil {
+		// Found encapsulation, start decoding it from the buffer.
+		return nh.decodeEncap(encapType, encapBuf)
+	}
+
+	return nil
+}
+
+// An MPLSNextHop is a route next hop using MPLS encapsulation.
+type MPLSNextHop struct {
+	Label         int
+	TrafficClass  int
+	BottomOfStack bool
+	TTL           uint8
+}
+
+// TODO(mdlayher): MPLSNextHop TTL vs MPLS_IPTUNNEL_TTL. What's the difference?
+
+// encodeEncap encodes netlink attribute values related to encapsulation from
+// a NextHop.
+func (nh *NextHop) encodeEncap(ae *netlink.AttributeEncoder) error {
+	// TODO: this only handles MPLS encapsulation as that is all we support.
+
+	// Allocate enough space for an MPLS label stack.
+	var (
+		i int
+		b = make([]byte, 4*len(nh.MPLS))
+	)
+
+	for _, mnh := range nh.MPLS {
+		// Pack the following:
+		//  - label: 20 bits
+		//  - traffic class: 3 bits
+		//  - bottom-of-stack: 1 bit
+		//  - TTL: 8 bits
+		binary.BigEndian.PutUint32(b[i:i+4], uint32(mnh.Label)<<12)
+
+		b[i+2] |= byte(mnh.TrafficClass) << 1
+
+		if mnh.BottomOfStack {
+			b[i+2] |= 1
+		}
+
+		b[i+3] = mnh.TTL
+
+		// Advance in the buffer to begin storing the next label.
+		i += 4
+	}
+
+	// Finally store the output bytes.
+	ae.Bytes(unix.MPLS_IPTUNNEL_DST, b)
+	return nil
+}
+
+// decodeEncap decodes netlink attribute values related to encapsulation into a
+// NextHop.
+func (nh *NextHop) decodeEncap(typ uint16, b []byte) error {
+	if typ != unix.LWTUNNEL_ENCAP_MPLS {
+		// TODO: handle other encapsulation types as needed.
+		return nil
+	}
+
+	// MPLS labels are stored as big endian bytes.
+	ad, err := netlink.NewAttributeDecoder(b)
+	if err != nil {
+		return err
+	}
+
+	for ad.Next() {
+		switch ad.Type() {
+		case unix.MPLS_IPTUNNEL_DST:
+			// Every 4 bytes stores another MPLS label, so make sure the stored
+			// bytes are divisible by exactly 4.
+			b := ad.Bytes()
+			if len(b)%4 != 0 {
+				return errInvalidRouteMessageAttr
+			}
+
+			for i := 0; i < len(b); i += 4 {
+				n := binary.BigEndian.Uint32(b[i : i+4])
+
+				// For reference, see:
+				// https://en.wikipedia.org/wiki/Multiprotocol_Label_Switching#Operation
+				nh.MPLS = append(nh.MPLS, MPLSNextHop{
+					Label:         int(n) >> 12,
+					TrafficClass:  int(n & 0xe00 >> 9),
+					BottomOfStack: n&0x100 != 0,
+					TTL:           uint8(n & 0xff),
+				})
+			}
+		}
+	}
+
 	return ad.Err()
 }
 
diff --git a/route_test.go b/route_test.go
index 77b315c..d68c1fd 100644
--- a/route_test.go
+++ b/route_test.go
@@ -204,6 +204,96 @@ func TestRouteMessageMarshalUnmarshalBinary(t *testing.T) {
 	}
 }
 
+func TestRouteMessageMarshalRoundTrip(t *testing.T) {
+	skipBigEndian(t)
+
+	// The above tests begin with unmarshaling raw bytes and are more
+	// comprehensive, but due to the complexity of nested route message
+	// attributes and structures, it has become rather difficult to maintain
+	// over time. These tests will focus on a subset of that functionality to
+	// ensure that marshaling and unmarshaling perform symmetrical operations
+	// given a proper Go type as input, rather than raw bytes.
+
+	tests := []struct {
+		name string
+		m    *RouteMessage
+	}{
+		{
+			name: "multipath MPLS",
+			m: &RouteMessage{
+				Attributes: RouteAttributes{
+					Multipath: []NextHop{
+						{
+							Hop: RTNextHop{
+								Length:  48,
+								IfIndex: 1,
+							},
+							Gateway: net.IPv4(10, 0, 0, 2),
+							MPLS: []MPLSNextHop{{
+								Label:         1,
+								TrafficClass:  1,
+								BottomOfStack: true,
+								TTL:           1,
+							}},
+						},
+						{
+							Hop: RTNextHop{
+								Length:  52,
+								IfIndex: 2,
+							},
+							Gateway: net.IPv4(10, 0, 0, 3),
+							MPLS: []MPLSNextHop{
+								{
+									Label:        1,
+									TrafficClass: 1,
+									TTL:          1,
+								},
+								{
+									Label:         2,
+									TrafficClass:  2,
+									BottomOfStack: true,
+									TTL:           2,
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// First do a marshaling and unmarshaling round trip to ensure
+			// the inputs and outputs are identical.
+			b1, err := tt.m.MarshalBinary()
+			if err != nil {
+				t.Fatalf("failed to marshal test message: %v", err)
+			}
+
+			var m RouteMessage
+			if err := m.UnmarshalBinary(b1); err != nil {
+				t.Fatalf("failed to unmarshal: %v", err)
+			}
+
+			if diff := cmp.Diff(tt.m, &m); diff != "" {
+				t.Fatalf("unexpected RouteMessage after round-trip (-want +got):\n%s", diff)
+			}
+
+			// Then compare the results of the first marshaled bytes against
+			// the newly marshaled bytes.
+			b2, err := m.MarshalBinary()
+			if err != nil {
+				t.Fatalf("failed to marshal parsed message: %v", err)
+			}
+
+			if diff := cmp.Diff(b1, b2); diff != "" {
+				t.Fatalf("unexpected final raw byte output (-want +got):\n%s", diff)
+			}
+		})
+	}
+}
+
 func TestRouteMessageUnmarshalBinaryErrors(t *testing.T) {
 	skipBigEndian(t)
 

From 56a462940019e1600ef605b2636177effdb87fc3 Mon Sep 17 00:00:00 2001
From: Matt Layher <mlayher@fastly.com>
Date: Wed, 18 Nov 2020 15:26:52 -0500
Subject: [PATCH 3/4] rtnetlink/testdata: add more go-fuzz corpus files from
 route message fuzzing

Signed-off-by: Matt Layher <mlayher@fastly.com>
---
 .../015234b16d15fc9a8d0087ebcbabf42ed76c0812-38   | Bin 0 -> 564 bytes
 .../049f49dc2b6c163d5faf1ded2c621fd1a28c9747-38   | Bin 0 -> 564 bytes
 .../082652416315336b5ba00681f7a743ccbbcbdd71-39   | Bin 0 -> 564 bytes
 .../1820dbf6107ca7b5c9a0467c4d9303de5d983334-36   | Bin 0 -> 564 bytes
 .../22050367926486cb43405d88b376404852959eb0-37   | Bin 0 -> 564 bytes
 .../2b10146eb2804173932f2f25df49dcde84bd5422-39   | Bin 0 -> 564 bytes
 .../2bf9c12550df885e9b2f0066bdaa24d693ba358b-38   | Bin 0 -> 564 bytes
 .../2e9520c3b8fd2b783473a53ce62ed06a80684085-39   | Bin 0 -> 564 bytes
 .../3dc09ec53e9c6aaee007fa6d1bc15e94fffbc71d-40   | Bin 0 -> 564 bytes
 .../5171ca7f61ac7a502d3d95b7939f6484604d76a4-36   | Bin 0 -> 572 bytes
 .../579d7e8d1b834c1665bf8d262f3db3ef0d15f768-41   | Bin 0 -> 564 bytes
 .../57c84d561021cf943fbe5f8e16fb4779a0f28565-39   | Bin 0 -> 564 bytes
 .../62b920726253e633e85f93860b81a7cbb9a9d2d2-44   | Bin 0 -> 564 bytes
 .../6e7731a90348ac8f9a9b796a36b0d0b69626c649-40   | Bin 0 -> 564 bytes
 .../793b71b44e38d3dd13bac21a7122660593abe93e-40   | Bin 0 -> 564 bytes
 .../7c9c703ad40808292786df199ad7b19c9e62ef41-37   | Bin 0 -> 564 bytes
 .../7d3d6e6c965f90001b7c070c3b0a13b6eaf7a7b2-38   | Bin 0 -> 564 bytes
 .../897184d5d21106fd90c7fb106e3b6bc2a82cc747-42   | Bin 0 -> 564 bytes
 .../8b3a1a36b36ef5bc3b65aec5ac39b6147bdd7827-36   | Bin 0 -> 564 bytes
 .../8c17bb9286605de46b6821387afce1ec5deb05eb-43   | Bin 0 -> 564 bytes
 .../8f433f0523d2446a2d89543e110eb2e4d9c32574-45   | Bin 0 -> 564 bytes
 .../91be8558028512ff8b8347a5cb2f1fc3d638d2a5-37   | Bin 0 -> 564 bytes
 .../92d4fec98c3d3bfa639ee7b8eef2cc053ce28371-40   | Bin 0 -> 564 bytes
 .../9995561d583953138ccfd0e503281ceb1ce41303-43   | Bin 0 -> 564 bytes
 .../a19f5e2491ee591b9b56a677774959ba11cc3904-41   | Bin 0 -> 564 bytes
 .../ae8252330686905fb5ca04487bcce1495d049916-39   | Bin 0 -> 564 bytes
 .../ba740bcd54cbcd72e1ee257b491e12b0393688f7-37   | Bin 0 -> 572 bytes
 .../bf2de846441c88778157887d19dd31dcfec04275-41   | Bin 0 -> 564 bytes
 .../c786db5f13f18bdf03cdf0a0960633d80228f1ba-45   | Bin 0 -> 564 bytes
 .../c9fa1541d79005ea684b524b509412ac99bf0922-37   | Bin 0 -> 564 bytes
 .../ce8e84d605fbd5e56c4228047ebb0df33d419f9a-44   | Bin 0 -> 564 bytes
 .../d90dbd3bc30144653fa216693e1da2371b75e35c-37   | Bin 0 -> 572 bytes
 .../e9f13f887905c098392e3e07bb1c1e0dec1adb72-42   | Bin 0 -> 564 bytes
 .../f1a6fc940fa8898d872272a80983757b5c0d7022-43   | Bin 0 -> 564 bytes
 .../fe9fabd89fb613484e6ba2c4cf7126497ec94718-36   | Bin 0 -> 564 bytes
 35 files changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 testdata/corpus/015234b16d15fc9a8d0087ebcbabf42ed76c0812-38
 create mode 100644 testdata/corpus/049f49dc2b6c163d5faf1ded2c621fd1a28c9747-38
 create mode 100644 testdata/corpus/082652416315336b5ba00681f7a743ccbbcbdd71-39
 create mode 100644 testdata/corpus/1820dbf6107ca7b5c9a0467c4d9303de5d983334-36
 create mode 100644 testdata/corpus/22050367926486cb43405d88b376404852959eb0-37
 create mode 100644 testdata/corpus/2b10146eb2804173932f2f25df49dcde84bd5422-39
 create mode 100644 testdata/corpus/2bf9c12550df885e9b2f0066bdaa24d693ba358b-38
 create mode 100644 testdata/corpus/2e9520c3b8fd2b783473a53ce62ed06a80684085-39
 create mode 100644 testdata/corpus/3dc09ec53e9c6aaee007fa6d1bc15e94fffbc71d-40
 create mode 100644 testdata/corpus/5171ca7f61ac7a502d3d95b7939f6484604d76a4-36
 create mode 100644 testdata/corpus/579d7e8d1b834c1665bf8d262f3db3ef0d15f768-41
 create mode 100644 testdata/corpus/57c84d561021cf943fbe5f8e16fb4779a0f28565-39
 create mode 100644 testdata/corpus/62b920726253e633e85f93860b81a7cbb9a9d2d2-44
 create mode 100644 testdata/corpus/6e7731a90348ac8f9a9b796a36b0d0b69626c649-40
 create mode 100644 testdata/corpus/793b71b44e38d3dd13bac21a7122660593abe93e-40
 create mode 100644 testdata/corpus/7c9c703ad40808292786df199ad7b19c9e62ef41-37
 create mode 100644 testdata/corpus/7d3d6e6c965f90001b7c070c3b0a13b6eaf7a7b2-38
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diff --git a/testdata/corpus/015234b16d15fc9a8d0087ebcbabf42ed76c0812-38 b/testdata/corpus/015234b16d15fc9a8d0087ebcbabf42ed76c0812-38
new file mode 100644
index 0000000000000000000000000000000000000000..52ac62515cc5f11f25609a657f55639a7fdeaa5f
GIT binary patch
literal 564
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literal 0
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diff --git a/testdata/corpus/049f49dc2b6c163d5faf1ded2c621fd1a28c9747-38 b/testdata/corpus/049f49dc2b6c163d5faf1ded2c621fd1a28c9747-38
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GIT binary patch
literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/082652416315336b5ba00681f7a743ccbbcbdd71-39 b/testdata/corpus/082652416315336b5ba00681f7a743ccbbcbdd71-39
new file mode 100644
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GIT binary patch
literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/1820dbf6107ca7b5c9a0467c4d9303de5d983334-36 b/testdata/corpus/1820dbf6107ca7b5c9a0467c4d9303de5d983334-36
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GIT binary patch
literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/22050367926486cb43405d88b376404852959eb0-37 b/testdata/corpus/22050367926486cb43405d88b376404852959eb0-37
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GIT binary patch
literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/2b10146eb2804173932f2f25df49dcde84bd5422-39 b/testdata/corpus/2b10146eb2804173932f2f25df49dcde84bd5422-39
new file mode 100644
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GIT binary patch
literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/2bf9c12550df885e9b2f0066bdaa24d693ba358b-38 b/testdata/corpus/2bf9c12550df885e9b2f0066bdaa24d693ba358b-38
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GIT binary patch
literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/2e9520c3b8fd2b783473a53ce62ed06a80684085-39 b/testdata/corpus/2e9520c3b8fd2b783473a53ce62ed06a80684085-39
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GIT binary patch
literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/3dc09ec53e9c6aaee007fa6d1bc15e94fffbc71d-40 b/testdata/corpus/3dc09ec53e9c6aaee007fa6d1bc15e94fffbc71d-40
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literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/5171ca7f61ac7a502d3d95b7939f6484604d76a4-36 b/testdata/corpus/5171ca7f61ac7a502d3d95b7939f6484604d76a4-36
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literal 572
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/579d7e8d1b834c1665bf8d262f3db3ef0d15f768-41 b/testdata/corpus/579d7e8d1b834c1665bf8d262f3db3ef0d15f768-41
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literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/57c84d561021cf943fbe5f8e16fb4779a0f28565-39 b/testdata/corpus/57c84d561021cf943fbe5f8e16fb4779a0f28565-39
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literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/62b920726253e633e85f93860b81a7cbb9a9d2d2-44 b/testdata/corpus/62b920726253e633e85f93860b81a7cbb9a9d2d2-44
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literal 564
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literal 0
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diff --git a/testdata/corpus/6e7731a90348ac8f9a9b796a36b0d0b69626c649-40 b/testdata/corpus/6e7731a90348ac8f9a9b796a36b0d0b69626c649-40
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literal 564
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literal 564
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literal 0
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/897184d5d21106fd90c7fb106e3b6bc2a82cc747-42 b/testdata/corpus/897184d5d21106fd90c7fb106e3b6bc2a82cc747-42
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literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/8b3a1a36b36ef5bc3b65aec5ac39b6147bdd7827-36 b/testdata/corpus/8b3a1a36b36ef5bc3b65aec5ac39b6147bdd7827-36
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literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/8c17bb9286605de46b6821387afce1ec5deb05eb-43 b/testdata/corpus/8c17bb9286605de46b6821387afce1ec5deb05eb-43
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HcmV?d00001

diff --git a/testdata/corpus/8f433f0523d2446a2d89543e110eb2e4d9c32574-45 b/testdata/corpus/8f433f0523d2446a2d89543e110eb2e4d9c32574-45
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literal 564
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HcmV?d00001

diff --git a/testdata/corpus/91be8558028512ff8b8347a5cb2f1fc3d638d2a5-37 b/testdata/corpus/91be8558028512ff8b8347a5cb2f1fc3d638d2a5-37
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HcmV?d00001

diff --git a/testdata/corpus/92d4fec98c3d3bfa639ee7b8eef2cc053ce28371-40 b/testdata/corpus/92d4fec98c3d3bfa639ee7b8eef2cc053ce28371-40
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literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/9995561d583953138ccfd0e503281ceb1ce41303-43 b/testdata/corpus/9995561d583953138ccfd0e503281ceb1ce41303-43
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GIT binary patch
literal 564
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literal 0
HcmV?d00001

diff --git a/testdata/corpus/a19f5e2491ee591b9b56a677774959ba11cc3904-41 b/testdata/corpus/a19f5e2491ee591b9b56a677774959ba11cc3904-41
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literal 564
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HcmV?d00001

diff --git a/testdata/corpus/ae8252330686905fb5ca04487bcce1495d049916-39 b/testdata/corpus/ae8252330686905fb5ca04487bcce1495d049916-39
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diff --git a/testdata/corpus/ba740bcd54cbcd72e1ee257b491e12b0393688f7-37 b/testdata/corpus/ba740bcd54cbcd72e1ee257b491e12b0393688f7-37
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diff --git a/testdata/corpus/bf2de846441c88778157887d19dd31dcfec04275-41 b/testdata/corpus/bf2de846441c88778157887d19dd31dcfec04275-41
new file mode 100644
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diff --git a/testdata/corpus/c786db5f13f18bdf03cdf0a0960633d80228f1ba-45 b/testdata/corpus/c786db5f13f18bdf03cdf0a0960633d80228f1ba-45
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literal 0
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diff --git a/testdata/corpus/c9fa1541d79005ea684b524b509412ac99bf0922-37 b/testdata/corpus/c9fa1541d79005ea684b524b509412ac99bf0922-37
new file mode 100644
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diff --git a/testdata/corpus/ce8e84d605fbd5e56c4228047ebb0df33d419f9a-44 b/testdata/corpus/ce8e84d605fbd5e56c4228047ebb0df33d419f9a-44
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diff --git a/testdata/corpus/d90dbd3bc30144653fa216693e1da2371b75e35c-37 b/testdata/corpus/d90dbd3bc30144653fa216693e1da2371b75e35c-37
new file mode 100644
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diff --git a/testdata/corpus/e9f13f887905c098392e3e07bb1c1e0dec1adb72-42 b/testdata/corpus/e9f13f887905c098392e3e07bb1c1e0dec1adb72-42
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diff --git a/testdata/corpus/f1a6fc940fa8898d872272a80983757b5c0d7022-43 b/testdata/corpus/f1a6fc940fa8898d872272a80983757b5c0d7022-43
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literal 0
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diff --git a/testdata/corpus/fe9fabd89fb613484e6ba2c4cf7126497ec94718-36 b/testdata/corpus/fe9fabd89fb613484e6ba2c4cf7126497ec94718-36
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literal 0
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From beb2a7965b1cec926d54a93db8a188f34723f4fc Mon Sep 17 00:00:00 2001
From: Matt Layher <mlayher@fastly.com>
Date: Wed, 18 Nov 2020 15:30:48 -0500
Subject: [PATCH 4/4] internal/unix: fix Mac build

Signed-off-by: Matt Layher <mlayher@fastly.com>
---
 internal/unix/types_other.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/internal/unix/types_other.go b/internal/unix/types_other.go
index 76f1bf4..3fbd62b 100644
--- a/internal/unix/types_other.go
+++ b/internal/unix/types_other.go
@@ -61,6 +61,9 @@ const (
 	IFLA_XDP_FLAGS       = 0x3
 	IFLA_XDP_PROG_ID     = 0x4
 	IFLA_XDP_EXPECTED_FD = 0x8
+	LWTUNNEL_ENCAP_MPLS  = 0x1
+	MPLS_IPTUNNEL_DST    = 0x1
+	MPLS_IPTUNNEL_TTL    = 0x2
 	NDA_UNSPEC           = 0x0
 	NDA_DST              = 0x1
 	NDA_LLADDR           = 0x2
@@ -68,6 +71,8 @@ const (
 	NDA_IFINDEX          = 0x8
 	RTA_UNSPEC           = 0x0
 	RTA_DST              = 0x1
+	RTA_ENCAP            = 0x16
+	RTA_ENCAP_TYPE       = 0x15
 	RTA_PREFSRC          = 0x7
 	RTA_GATEWAY          = 0x5
 	RTA_OIF              = 0x4