3 files changed, 391 insertions, 37 deletions
diff --git a/pkg/tcpip/transport/packet/BUILD b/pkg/tcpip/transport/packet/BUILD
deleted file mode 100644
index b989b1209..000000000
--- a/pkg/tcpip/transport/packet/BUILD
+++ /dev/null
@@ -1,37 +0,0 @@
-load("//tools:defs.bzl", "go_library")
-load("//tools/go_generics:defs.bzl", "go_template_instance")
-
-package(licenses = ["notice"])
-
-go_template_instance(
-    name = "packet_list",
-    out = "packet_list.go",
-    package = "packet",
-    prefix = "packet",
-    template = "//pkg/ilist:generic_list",
-    types = {
-        "Element": "*packet",
-        "Linker": "*packet",
-    },
-)
-
-go_library(
-    name = "packet",
-    srcs = [
-        "endpoint.go",
-        "endpoint_state.go",
-        "packet_list.go",
-    ],
-    imports = ["gvisor.dev/gvisor/pkg/tcpip/buffer"],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//pkg/log",
-        "//pkg/sleep",
-        "//pkg/sync",
-        "//pkg/tcpip",
-        "//pkg/tcpip/buffer",
-        "//pkg/tcpip/header",
-        "//pkg/tcpip/stack",
-        "//pkg/waiter",
-    ],
-)
diff --git a/pkg/tcpip/transport/packet/packet_list.go b/pkg/tcpip/transport/packet/packet_list.go
new file mode 100644
index 000000000..2c983aad0
--- /dev/null
+++ b/pkg/tcpip/transport/packet/packet_list.go
@@ -0,0 +1,221 @@
+package packet
+
+// ElementMapper provides an identity mapping by default.
+//
+// This can be replaced to provide a struct that maps elements to linker
+// objects, if they are not the same. An ElementMapper is not typically
+// required if: Linker is left as is, Element is left as is, or Linker and
+// Element are the same type.
+type packetElementMapper struct{}
+
+// linkerFor maps an Element to a Linker.
+//
+// This default implementation should be inlined.
+//
+//go:nosplit
+func (packetElementMapper) linkerFor(elem *packet) *packet { return elem }
+
+// List is an intrusive list. Entries can be added to or removed from the list
+// in O(1) time and with no additional memory allocations.
+//
+// The zero value for List is an empty list ready to use.
+//
+// To iterate over a list (where l is a List):
+//      for e := l.Front(); e != nil; e = e.Next() {
+// 		// do something with e.
+//      }
+//
+// +stateify savable
+type packetList struct {
+	head *packet
+	tail *packet
+}
+
+// Reset resets list l to the empty state.
+func (l *packetList) Reset() {
+	l.head = nil
+	l.tail = nil
+}
+
+// Empty returns true iff the list is empty.
+//
+//go:nosplit
+func (l *packetList) Empty() bool {
+	return l.head == nil
+}
+
+// Front returns the first element of list l or nil.
+//
+//go:nosplit
+func (l *packetList) Front() *packet {
+	return l.head
+}
+
+// Back returns the last element of list l or nil.
+//
+//go:nosplit
+func (l *packetList) Back() *packet {
+	return l.tail
+}
+
+// Len returns the number of elements in the list.
+//
+// NOTE: This is an O(n) operation.
+//
+//go:nosplit
+func (l *packetList) Len() (count int) {
+	for e := l.Front(); e != nil; e = (packetElementMapper{}.linkerFor(e)).Next() {
+		count++
+	}
+	return count
+}
+
+// PushFront inserts the element e at the front of list l.
+//
+//go:nosplit
+func (l *packetList) PushFront(e *packet) {
+	linker := packetElementMapper{}.linkerFor(e)
+	linker.SetNext(l.head)
+	linker.SetPrev(nil)
+	if l.head != nil {
+		packetElementMapper{}.linkerFor(l.head).SetPrev(e)
+	} else {
+		l.tail = e
+	}
+
+	l.head = e
+}
+
+// PushBack inserts the element e at the back of list l.
+//
+//go:nosplit
+func (l *packetList) PushBack(e *packet) {
+	linker := packetElementMapper{}.linkerFor(e)
+	linker.SetNext(nil)
+	linker.SetPrev(l.tail)
+	if l.tail != nil {
+		packetElementMapper{}.linkerFor(l.tail).SetNext(e)
+	} else {
+		l.head = e
+	}
+
+	l.tail = e
+}
+
+// PushBackList inserts list m at the end of list l, emptying m.
+//
+//go:nosplit
+func (l *packetList) PushBackList(m *packetList) {
+	if l.head == nil {
+		l.head = m.head
+		l.tail = m.tail
+	} else if m.head != nil {
+		packetElementMapper{}.linkerFor(l.tail).SetNext(m.head)
+		packetElementMapper{}.linkerFor(m.head).SetPrev(l.tail)
+
+		l.tail = m.tail
+	}
+	m.head = nil
+	m.tail = nil
+}
+
+// InsertAfter inserts e after b.
+//
+//go:nosplit
+func (l *packetList) InsertAfter(b, e *packet) {
+	bLinker := packetElementMapper{}.linkerFor(b)
+	eLinker := packetElementMapper{}.linkerFor(e)
+
+	a := bLinker.Next()
+
+	eLinker.SetNext(a)
+	eLinker.SetPrev(b)
+	bLinker.SetNext(e)
+
+	if a != nil {
+		packetElementMapper{}.linkerFor(a).SetPrev(e)
+	} else {
+		l.tail = e
+	}
+}
+
+// InsertBefore inserts e before a.
+//
+//go:nosplit
+func (l *packetList) InsertBefore(a, e *packet) {
+	aLinker := packetElementMapper{}.linkerFor(a)
+	eLinker := packetElementMapper{}.linkerFor(e)
+
+	b := aLinker.Prev()
+	eLinker.SetNext(a)
+	eLinker.SetPrev(b)
+	aLinker.SetPrev(e)
+
+	if b != nil {
+		packetElementMapper{}.linkerFor(b).SetNext(e)
+	} else {
+		l.head = e
+	}
+}
+
+// Remove removes e from l.
+//
+//go:nosplit
+func (l *packetList) Remove(e *packet) {
+	linker := packetElementMapper{}.linkerFor(e)
+	prev := linker.Prev()
+	next := linker.Next()
+
+	if prev != nil {
+		packetElementMapper{}.linkerFor(prev).SetNext(next)
+	} else if l.head == e {
+		l.head = next
+	}
+
+	if next != nil {
+		packetElementMapper{}.linkerFor(next).SetPrev(prev)
+	} else if l.tail == e {
+		l.tail = prev
+	}
+
+	linker.SetNext(nil)
+	linker.SetPrev(nil)
+}
+
+// Entry is a default implementation of Linker. Users can add anonymous fields
+// of this type to their structs to make them automatically implement the
+// methods needed by List.
+//
+// +stateify savable
+type packetEntry struct {
+	next *packet
+	prev *packet
+}
+
+// Next returns the entry that follows e in the list.
+//
+//go:nosplit
+func (e *packetEntry) Next() *packet {
+	return e.next
+}
+
+// Prev returns the entry that precedes e in the list.
+//
+//go:nosplit
+func (e *packetEntry) Prev() *packet {
+	return e.prev
+}
+
+// SetNext assigns 'entry' as the entry that follows e in the list.
+//
+//go:nosplit
+func (e *packetEntry) SetNext(elem *packet) {
+	e.next = elem
+}
+
+// SetPrev assigns 'entry' as the entry that precedes e in the list.
+//
+//go:nosplit
+func (e *packetEntry) SetPrev(elem *packet) {
+	e.prev = elem
+}
diff --git a/pkg/tcpip/transport/packet/packet_state_autogen.go b/pkg/tcpip/transport/packet/packet_state_autogen.go
new file mode 100644
index 000000000..b1e685bb4
--- /dev/null
+++ b/pkg/tcpip/transport/packet/packet_state_autogen.go
@@ -0,0 +1,170 @@
+// automatically generated by stateify.
+
+package packet
+
+import (
+	"gvisor.dev/gvisor/pkg/state"
+	"gvisor.dev/gvisor/pkg/tcpip/buffer"
+)
+
+func (p *packet) StateTypeName() string {
+	return "pkg/tcpip/transport/packet.packet"
+}
+
+func (p *packet) StateFields() []string {
+	return []string{
+		"packetEntry",
+		"data",
+		"receivedAt",
+		"senderAddr",
+		"packetInfo",
+	}
+}
+
+func (p *packet) beforeSave() {}
+
+// +checklocksignore
+func (p *packet) StateSave(stateSinkObject state.Sink) {
+	p.beforeSave()
+	var dataValue buffer.VectorisedView
+	dataValue = p.saveData()
+	stateSinkObject.SaveValue(1, dataValue)
+	var receivedAtValue int64
+	receivedAtValue = p.saveReceivedAt()
+	stateSinkObject.SaveValue(2, receivedAtValue)
+	stateSinkObject.Save(0, &p.packetEntry)
+	stateSinkObject.Save(3, &p.senderAddr)
+	stateSinkObject.Save(4, &p.packetInfo)
+}
+
+func (p *packet) afterLoad() {}
+
+// +checklocksignore
+func (p *packet) StateLoad(stateSourceObject state.Source) {
+	stateSourceObject.Load(0, &p.packetEntry)
+	stateSourceObject.Load(3, &p.senderAddr)
+	stateSourceObject.Load(4, &p.packetInfo)
+	stateSourceObject.LoadValue(1, new(buffer.VectorisedView), func(y interface{}) { p.loadData(y.(buffer.VectorisedView)) })
+	stateSourceObject.LoadValue(2, new(int64), func(y interface{}) { p.loadReceivedAt(y.(int64)) })
+}
+
+func (ep *endpoint) StateTypeName() string {
+	return "pkg/tcpip/transport/packet.endpoint"
+}
+
+func (ep *endpoint) StateFields() []string {
+	return []string{
+		"DefaultSocketOptionsHandler",
+		"waiterQueue",
+		"cooked",
+		"ops",
+		"stats",
+		"rcvList",
+		"rcvBufSize",
+		"rcvClosed",
+		"rcvDisabled",
+		"closed",
+		"boundNetProto",
+		"boundNIC",
+		"lastError",
+	}
+}
+
+// +checklocksignore
+func (ep *endpoint) StateSave(stateSinkObject state.Sink) {
+	ep.beforeSave()
+	stateSinkObject.Save(0, &ep.DefaultSocketOptionsHandler)
+	stateSinkObject.Save(1, &ep.waiterQueue)
+	stateSinkObject.Save(2, &ep.cooked)
+	stateSinkObject.Save(3, &ep.ops)
+	stateSinkObject.Save(4, &ep.stats)
+	stateSinkObject.Save(5, &ep.rcvList)
+	stateSinkObject.Save(6, &ep.rcvBufSize)
+	stateSinkObject.Save(7, &ep.rcvClosed)
+	stateSinkObject.Save(8, &ep.rcvDisabled)
+	stateSinkObject.Save(9, &ep.closed)
+	stateSinkObject.Save(10, &ep.boundNetProto)
+	stateSinkObject.Save(11, &ep.boundNIC)
+	stateSinkObject.Save(12, &ep.lastError)
+}
+
+// +checklocksignore
+func (ep *endpoint) StateLoad(stateSourceObject state.Source) {
+	stateSourceObject.Load(0, &ep.DefaultSocketOptionsHandler)
+	stateSourceObject.Load(1, &ep.waiterQueue)
+	stateSourceObject.Load(2, &ep.cooked)
+	stateSourceObject.Load(3, &ep.ops)
+	stateSourceObject.Load(4, &ep.stats)
+	stateSourceObject.Load(5, &ep.rcvList)
+	stateSourceObject.Load(6, &ep.rcvBufSize)
+	stateSourceObject.Load(7, &ep.rcvClosed)
+	stateSourceObject.Load(8, &ep.rcvDisabled)
+	stateSourceObject.Load(9, &ep.closed)
+	stateSourceObject.Load(10, &ep.boundNetProto)
+	stateSourceObject.Load(11, &ep.boundNIC)
+	stateSourceObject.Load(12, &ep.lastError)
+	stateSourceObject.AfterLoad(ep.afterLoad)
+}
+
+func (l *packetList) StateTypeName() string {
+	return "pkg/tcpip/transport/packet.packetList"
+}
+
+func (l *packetList) StateFields() []string {
+	return []string{
+		"head",
+		"tail",
+	}
+}
+
+func (l *packetList) beforeSave() {}
+
+// +checklocksignore
+func (l *packetList) StateSave(stateSinkObject state.Sink) {
+	l.beforeSave()
+	stateSinkObject.Save(0, &l.head)
+	stateSinkObject.Save(1, &l.tail)
+}
+
+func (l *packetList) afterLoad() {}
+
+// +checklocksignore
+func (l *packetList) StateLoad(stateSourceObject state.Source) {
+	stateSourceObject.Load(0, &l.head)
+	stateSourceObject.Load(1, &l.tail)
+}
+
+func (e *packetEntry) StateTypeName() string {
+	return "pkg/tcpip/transport/packet.packetEntry"
+}
+
+func (e *packetEntry) StateFields() []string {
+	return []string{
+		"next",
+		"prev",
+	}
+}
+
+func (e *packetEntry) beforeSave() {}
+
+// +checklocksignore
+func (e *packetEntry) StateSave(stateSinkObject state.Sink) {
+	e.beforeSave()
+	stateSinkObject.Save(0, &e.next)
+	stateSinkObject.Save(1, &e.prev)
+}
+
+func (e *packetEntry) afterLoad() {}
+
+// +checklocksignore
+func (e *packetEntry) StateLoad(stateSourceObject state.Source) {
+	stateSourceObject.Load(0, &e.next)
+	stateSourceObject.Load(1, &e.prev)
+}
+
+func init() {
+	state.Register((*packet)(nil))
+	state.Register((*endpoint)(nil))
+	state.Register((*packetList)(nil))
+	state.Register((*packetEntry)(nil))
+}