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-rw-r--r--pkg/tcpip/buffer/BUILD1
-rw-r--r--pkg/tcpip/buffer/view.go10
-rw-r--r--pkg/tcpip/buffer/view_test.go13
-rw-r--r--pkg/tcpip/buffer/view_unsafe.go22
-rw-r--r--pkg/tcpip/network/fragmentation/fragmentation.go32
-rw-r--r--pkg/tcpip/network/fragmentation/fragmentation_test.go96
-rw-r--r--pkg/tcpip/network/fragmentation/reassembler.go39
-rw-r--r--pkg/tcpip/network/fragmentation/reassembler_test.go87
-rw-r--r--pkg/tcpip/network/ipv4/BUILD1
-rw-r--r--pkg/tcpip/network/ipv4/ipv4.go5
-rw-r--r--pkg/tcpip/network/ipv4/ipv4_test.go33
-rw-r--r--pkg/tcpip/network/ipv6/ipv6.go4
-rw-r--r--pkg/tcpip/stack/BUILD1
-rw-r--r--pkg/tcpip/stack/packet_buffer.go6
-rw-r--r--pkg/tcpip/stack/packet_buffer_unsafe.go19
15 files changed, 260 insertions, 109 deletions
diff --git a/pkg/tcpip/buffer/BUILD b/pkg/tcpip/buffer/BUILD
index c9bcf9326..23aa0ad05 100644
--- a/pkg/tcpip/buffer/BUILD
+++ b/pkg/tcpip/buffer/BUILD
@@ -7,6 +7,7 @@ go_library(
srcs = [
"prependable.go",
"view.go",
+ "view_unsafe.go",
],
visibility = ["//visibility:public"],
)
diff --git a/pkg/tcpip/buffer/view.go b/pkg/tcpip/buffer/view.go
index 91cc62cc8..b05e81526 100644
--- a/pkg/tcpip/buffer/view.go
+++ b/pkg/tcpip/buffer/view.go
@@ -239,6 +239,16 @@ func (vv *VectorisedView) Size() int {
return vv.size
}
+// MemSize returns the estimation size of the vv in memory, including backing
+// buffer data.
+func (vv *VectorisedView) MemSize() int {
+ var size int
+ for _, v := range vv.views {
+ size += cap(v)
+ }
+ return size + cap(vv.views)*viewStructSize + vectorisedViewStructSize
+}
+
// ToView returns a single view containing the content of the vectorised view.
//
// If the vectorised view contains a single view, that view will be returned
diff --git a/pkg/tcpip/buffer/view_test.go b/pkg/tcpip/buffer/view_test.go
index e7f7cc9f1..78b2faa26 100644
--- a/pkg/tcpip/buffer/view_test.go
+++ b/pkg/tcpip/buffer/view_test.go
@@ -20,6 +20,7 @@ import (
"io"
"reflect"
"testing"
+ "unsafe"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
@@ -578,3 +579,15 @@ func TestAppendView(t *testing.T) {
}
}
}
+
+func TestMemSize(t *testing.T) {
+ const perViewCap = 128
+ views := make([]buffer.View, 2, 32)
+ views[0] = make(buffer.View, 10, perViewCap)
+ views[1] = make(buffer.View, 20, perViewCap)
+ vv := buffer.NewVectorisedView(30, views)
+ want := int(unsafe.Sizeof(vv)) + cap(views)*int(unsafe.Sizeof(views)) + 2*perViewCap
+ if got := vv.MemSize(); got != want {
+ t.Errorf("vv.MemSize() = %d, want %d", got, want)
+ }
+}
diff --git a/pkg/tcpip/buffer/view_unsafe.go b/pkg/tcpip/buffer/view_unsafe.go
new file mode 100644
index 000000000..75ccd40f8
--- /dev/null
+++ b/pkg/tcpip/buffer/view_unsafe.go
@@ -0,0 +1,22 @@
+// Copyright 2021 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 buffer
+
+import "unsafe"
+
+const (
+ vectorisedViewStructSize = int(unsafe.Sizeof(VectorisedView{}))
+ viewStructSize = int(unsafe.Sizeof(View{}))
+)
diff --git a/pkg/tcpip/network/fragmentation/fragmentation.go b/pkg/tcpip/network/fragmentation/fragmentation.go
index 1af87d713..243738951 100644
--- a/pkg/tcpip/network/fragmentation/fragmentation.go
+++ b/pkg/tcpip/network/fragmentation/fragmentation.go
@@ -84,7 +84,7 @@ type Fragmentation struct {
lowLimit int
reassemblers map[FragmentID]*reassembler
rList reassemblerList
- size int
+ memSize int
timeout time.Duration
blockSize uint16
clock tcpip.Clock
@@ -156,22 +156,22 @@ func NewFragmentation(blockSize uint16, highMemoryLimit, lowMemoryLimit int, rea
// the protocol to identify a fragment.
func (f *Fragmentation) Process(
id FragmentID, first, last uint16, more bool, proto uint8, pkt *stack.PacketBuffer) (
- buffer.VectorisedView, uint8, bool, error) {
+ *stack.PacketBuffer, uint8, bool, error) {
if first > last {
- return buffer.VectorisedView{}, 0, false, fmt.Errorf("first=%d is greater than last=%d: %w", first, last, ErrInvalidArgs)
+ return nil, 0, false, fmt.Errorf("first=%d is greater than last=%d: %w", first, last, ErrInvalidArgs)
}
if first%f.blockSize != 0 {
- return buffer.VectorisedView{}, 0, false, fmt.Errorf("first=%d is not a multiple of block size=%d: %w", first, f.blockSize, ErrInvalidArgs)
+ return nil, 0, false, fmt.Errorf("first=%d is not a multiple of block size=%d: %w", first, f.blockSize, ErrInvalidArgs)
}
fragmentSize := last - first + 1
if more && fragmentSize%f.blockSize != 0 {
- return buffer.VectorisedView{}, 0, false, fmt.Errorf("fragment size=%d bytes is not a multiple of block size=%d on non-final fragment: %w", fragmentSize, f.blockSize, ErrInvalidArgs)
+ return nil, 0, false, fmt.Errorf("fragment size=%d bytes is not a multiple of block size=%d on non-final fragment: %w", fragmentSize, f.blockSize, ErrInvalidArgs)
}
if l := pkt.Data.Size(); l != int(fragmentSize) {
- return buffer.VectorisedView{}, 0, false, fmt.Errorf("got fragment size=%d bytes not equal to the expected fragment size=%d bytes (first=%d last=%d): %w", l, fragmentSize, first, last, ErrInvalidArgs)
+ return nil, 0, false, fmt.Errorf("got fragment size=%d bytes not equal to the expected fragment size=%d bytes (first=%d last=%d): %w", l, fragmentSize, first, last, ErrInvalidArgs)
}
f.mu.Lock()
@@ -190,24 +190,24 @@ func (f *Fragmentation) Process(
}
f.mu.Unlock()
- res, firstFragmentProto, done, consumed, err := r.process(first, last, more, proto, pkt)
+ resPkt, firstFragmentProto, done, memConsumed, err := r.process(first, last, more, proto, pkt)
if err != nil {
// We probably got an invalid sequence of fragments. Just
// discard the reassembler and move on.
f.mu.Lock()
f.release(r, false /* timedOut */)
f.mu.Unlock()
- return buffer.VectorisedView{}, 0, false, fmt.Errorf("fragmentation processing error: %w", err)
+ return nil, 0, false, fmt.Errorf("fragmentation processing error: %w", err)
}
f.mu.Lock()
- f.size += consumed
+ f.memSize += memConsumed
if done {
f.release(r, false /* timedOut */)
}
// Evict reassemblers if we are consuming more memory than highLimit until
// we reach lowLimit.
- if f.size > f.highLimit {
- for f.size > f.lowLimit {
+ if f.memSize > f.highLimit {
+ for f.memSize > f.lowLimit {
tail := f.rList.Back()
if tail == nil {
break
@@ -216,7 +216,7 @@ func (f *Fragmentation) Process(
}
}
f.mu.Unlock()
- return res, firstFragmentProto, done, nil
+ return resPkt, firstFragmentProto, done, nil
}
func (f *Fragmentation) release(r *reassembler, timedOut bool) {
@@ -228,10 +228,10 @@ func (f *Fragmentation) release(r *reassembler, timedOut bool) {
delete(f.reassemblers, r.id)
f.rList.Remove(r)
- f.size -= r.size
- if f.size < 0 {
- log.Printf("memory counter < 0 (%d), this is an accounting bug that requires investigation", f.size)
- f.size = 0
+ f.memSize -= r.memSize
+ if f.memSize < 0 {
+ log.Printf("memory counter < 0 (%d), this is an accounting bug that requires investigation", f.memSize)
+ f.memSize = 0
}
if h := f.timeoutHandler; timedOut && h != nil {
diff --git a/pkg/tcpip/network/fragmentation/fragmentation_test.go b/pkg/tcpip/network/fragmentation/fragmentation_test.go
index 3a79688a8..905bbc19b 100644
--- a/pkg/tcpip/network/fragmentation/fragmentation_test.go
+++ b/pkg/tcpip/network/fragmentation/fragmentation_test.go
@@ -16,7 +16,6 @@ package fragmentation
import (
"errors"
- "reflect"
"testing"
"time"
@@ -112,20 +111,20 @@ func TestFragmentationProcess(t *testing.T) {
f := NewFragmentation(minBlockSize, 1024, 512, reassembleTimeout, &faketime.NullClock{}, nil)
firstFragmentProto := c.in[0].proto
for i, in := range c.in {
- vv, proto, done, err := f.Process(in.id, in.first, in.last, in.more, in.proto, in.pkt)
+ resPkt, proto, done, err := f.Process(in.id, in.first, in.last, in.more, in.proto, in.pkt)
if err != nil {
t.Fatalf("f.Process(%+v, %d, %d, %t, %d, %#v) failed: %s",
in.id, in.first, in.last, in.more, in.proto, in.pkt, err)
}
- if !reflect.DeepEqual(vv, c.out[i].vv) {
- t.Errorf("got Process(%+v, %d, %d, %t, %d, %#v) = (%X, _, _, _), want = (%X, _, _, _)",
- in.id, in.first, in.last, in.more, in.proto, in.pkt, vv.ToView(), c.out[i].vv.ToView())
- }
if done != c.out[i].done {
t.Errorf("got Process(%+v, %d, %d, %t, %d, _) = (_, _, %t, _), want = (_, _, %t, _)",
in.id, in.first, in.last, in.more, in.proto, done, c.out[i].done)
}
if c.out[i].done {
+ if diff := cmp.Diff(c.out[i].vv.ToOwnedView(), resPkt.Data.ToOwnedView()); diff != "" {
+ t.Errorf("got Process(%+v, %d, %d, %t, %d, %#v) result mismatch (-want, +got):\n%s",
+ in.id, in.first, in.last, in.more, in.proto, in.pkt, diff)
+ }
if firstFragmentProto != proto {
t.Errorf("got Process(%+v, %d, %d, %t, %d, _) = (_, %d, _, _), want = (_, %d, _, _)",
in.id, in.first, in.last, in.more, in.proto, proto, firstFragmentProto)
@@ -173,9 +172,17 @@ func TestReassemblingTimeout(t *testing.T) {
// reassembly is done after the fragment is processd.
expectDone bool
- // sizeAfterEvent is the expected size of the fragmentation instance after
- // the event.
- sizeAfterEvent int
+ // memSizeAfterEvent is the expected memory size of the fragmentation
+ // instance after the event.
+ memSizeAfterEvent int
+ }
+
+ memSizeOfFrags := func(frags ...*fragment) int {
+ var size int
+ for _, frag := range frags {
+ size += pkt(len(frag.data), frag.data).MemSize()
+ }
+ return size
}
half1 := &fragment{first: 0, last: 0, more: true, data: "0"}
@@ -189,16 +196,16 @@ func TestReassemblingTimeout(t *testing.T) {
name: "half1 and half2 are reassembled successfully",
events: []event{
{
- name: "half1",
- fragment: half1,
- expectDone: false,
- sizeAfterEvent: 1,
+ name: "half1",
+ fragment: half1,
+ expectDone: false,
+ memSizeAfterEvent: memSizeOfFrags(half1),
},
{
- name: "half2",
- fragment: half2,
- expectDone: true,
- sizeAfterEvent: 0,
+ name: "half2",
+ fragment: half2,
+ expectDone: true,
+ memSizeAfterEvent: 0,
},
},
},
@@ -206,36 +213,36 @@ func TestReassemblingTimeout(t *testing.T) {
name: "half1 timeout, half2 timeout",
events: []event{
{
- name: "half1",
- fragment: half1,
- expectDone: false,
- sizeAfterEvent: 1,
+ name: "half1",
+ fragment: half1,
+ expectDone: false,
+ memSizeAfterEvent: memSizeOfFrags(half1),
},
{
- name: "half1 just before reassembly timeout",
- clockAdvance: reassemblyTimeout - 1,
- sizeAfterEvent: 1,
+ name: "half1 just before reassembly timeout",
+ clockAdvance: reassemblyTimeout - 1,
+ memSizeAfterEvent: memSizeOfFrags(half1),
},
{
- name: "half1 reassembly timeout",
- clockAdvance: 1,
- sizeAfterEvent: 0,
+ name: "half1 reassembly timeout",
+ clockAdvance: 1,
+ memSizeAfterEvent: 0,
},
{
- name: "half2",
- fragment: half2,
- expectDone: false,
- sizeAfterEvent: 1,
+ name: "half2",
+ fragment: half2,
+ expectDone: false,
+ memSizeAfterEvent: memSizeOfFrags(half2),
},
{
- name: "half2 just before reassembly timeout",
- clockAdvance: reassemblyTimeout - 1,
- sizeAfterEvent: 1,
+ name: "half2 just before reassembly timeout",
+ clockAdvance: reassemblyTimeout - 1,
+ memSizeAfterEvent: memSizeOfFrags(half2),
},
{
- name: "half2 reassembly timeout",
- clockAdvance: 1,
- sizeAfterEvent: 0,
+ name: "half2 reassembly timeout",
+ clockAdvance: 1,
+ memSizeAfterEvent: 0,
},
},
},
@@ -255,8 +262,8 @@ func TestReassemblingTimeout(t *testing.T) {
t.Fatalf("%s: got done = %t, want = %t", event.name, done, event.expectDone)
}
}
- if got, want := f.size, event.sizeAfterEvent; got != want {
- t.Errorf("%s: got f.size = %d, want = %d", event.name, got, want)
+ if got, want := f.memSize, event.memSizeAfterEvent; got != want {
+ t.Errorf("%s: got f.memSize = %d, want = %d", event.name, got, want)
}
}
})
@@ -264,7 +271,9 @@ func TestReassemblingTimeout(t *testing.T) {
}
func TestMemoryLimits(t *testing.T) {
- f := NewFragmentation(minBlockSize, 3, 1, reassembleTimeout, &faketime.NullClock{}, nil)
+ lowLimit := pkt(1, "0").MemSize()
+ highLimit := 3 * lowLimit // Allow at most 3 such packets.
+ f := NewFragmentation(minBlockSize, highLimit, lowLimit, reassembleTimeout, &faketime.NullClock{}, nil)
// Send first fragment with id = 0.
f.Process(FragmentID{ID: 0}, 0, 0, true, 0xFF, pkt(1, "0"))
// Send first fragment with id = 1.
@@ -288,15 +297,14 @@ func TestMemoryLimits(t *testing.T) {
}
func TestMemoryLimitsIgnoresDuplicates(t *testing.T) {
- f := NewFragmentation(minBlockSize, 1, 0, reassembleTimeout, &faketime.NullClock{}, nil)
+ memSize := pkt(1, "0").MemSize()
+ f := NewFragmentation(minBlockSize, memSize, 0, reassembleTimeout, &faketime.NullClock{}, nil)
// Send first fragment with id = 0.
f.Process(FragmentID{}, 0, 0, true, 0xFF, pkt(1, "0"))
// Send the same packet again.
f.Process(FragmentID{}, 0, 0, true, 0xFF, pkt(1, "0"))
- got := f.size
- want := 1
- if got != want {
+ if got, want := f.memSize, memSize; got != want {
t.Errorf("Wrong size, duplicates are not handled correctly: got=%d, want=%d.", got, want)
}
}
diff --git a/pkg/tcpip/network/fragmentation/reassembler.go b/pkg/tcpip/network/fragmentation/reassembler.go
index 9b20bb1d8..933d63d32 100644
--- a/pkg/tcpip/network/fragmentation/reassembler.go
+++ b/pkg/tcpip/network/fragmentation/reassembler.go
@@ -20,7 +20,6 @@ import (
"gvisor.dev/gvisor/pkg/sync"
"gvisor.dev/gvisor/pkg/tcpip"
- "gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/stack"
)
@@ -29,13 +28,15 @@ type hole struct {
last uint16
filled bool
final bool
- data buffer.View
+ // pkt is the fragment packet if hole is filled. We keep the whole pkt rather
+ // than the fragmented payload to prevent binding to specific buffer types.
+ pkt *stack.PacketBuffer
}
type reassembler struct {
reassemblerEntry
id FragmentID
- size int
+ memSize int
proto uint8
mu sync.Mutex
holes []hole
@@ -59,18 +60,18 @@ func newReassembler(id FragmentID, clock tcpip.Clock) *reassembler {
return r
}
-func (r *reassembler) process(first, last uint16, more bool, proto uint8, pkt *stack.PacketBuffer) (buffer.VectorisedView, uint8, bool, int, error) {
+func (r *reassembler) process(first, last uint16, more bool, proto uint8, pkt *stack.PacketBuffer) (*stack.PacketBuffer, uint8, bool, int, error) {
r.mu.Lock()
defer r.mu.Unlock()
if r.done {
// A concurrent goroutine might have already reassembled
// the packet and emptied the heap while this goroutine
// was waiting on the mutex. We don't have to do anything in this case.
- return buffer.VectorisedView{}, 0, false, 0, nil
+ return nil, 0, false, 0, nil
}
var holeFound bool
- var consumed int
+ var memConsumed int
for i := range r.holes {
currentHole := &r.holes[i]
@@ -90,12 +91,12 @@ func (r *reassembler) process(first, last uint16, more bool, proto uint8, pkt *s
// https://github.com/torvalds/linux/blob/38525c6/net/ipv4/inet_fragment.c#L349
if first < currentHole.first || currentHole.last < last {
// Incoming fragment only partially fits in the free hole.
- return buffer.VectorisedView{}, 0, false, 0, ErrFragmentOverlap
+ return nil, 0, false, 0, ErrFragmentOverlap
}
if !more {
if !currentHole.final || currentHole.filled && currentHole.last != last {
// We have another final fragment, which does not perfectly overlap.
- return buffer.VectorisedView{}, 0, false, 0, ErrFragmentConflict
+ return nil, 0, false, 0, ErrFragmentConflict
}
}
@@ -124,16 +125,15 @@ func (r *reassembler) process(first, last uint16, more bool, proto uint8, pkt *s
})
currentHole.final = false
}
- v := pkt.Data.ToOwnedView()
- consumed = v.Size()
- r.size += consumed
+ memConsumed = pkt.MemSize()
+ r.memSize += memConsumed
// Update the current hole to precisely match the incoming fragment.
r.holes[i] = hole{
first: first,
last: last,
filled: true,
final: currentHole.final,
- data: v,
+ pkt: pkt,
}
r.filled++
// For IPv6, it is possible to have different Protocol values between
@@ -153,25 +153,24 @@ func (r *reassembler) process(first, last uint16, more bool, proto uint8, pkt *s
}
if !holeFound {
// Incoming fragment is beyond end.
- return buffer.VectorisedView{}, 0, false, 0, ErrFragmentConflict
+ return nil, 0, false, 0, ErrFragmentConflict
}
// Check if all the holes have been filled and we are ready to reassemble.
if r.filled < len(r.holes) {
- return buffer.VectorisedView{}, 0, false, consumed, nil
+ return nil, 0, false, memConsumed, nil
}
sort.Slice(r.holes, func(i, j int) bool {
return r.holes[i].first < r.holes[j].first
})
- var size int
- views := make([]buffer.View, 0, len(r.holes))
- for _, hole := range r.holes {
- views = append(views, hole.data)
- size += hole.data.Size()
+ resPkt := r.holes[0].pkt
+ for i := 1; i < len(r.holes); i++ {
+ fragPkt := r.holes[i].pkt
+ fragPkt.Data.ReadToVV(&resPkt.Data, fragPkt.Data.Size())
}
- return buffer.NewVectorisedView(size, views), r.proto, true, consumed, nil
+ return resPkt, r.proto, true, memConsumed, nil
}
func (r *reassembler) checkDoneOrMark() bool {
diff --git a/pkg/tcpip/network/fragmentation/reassembler_test.go b/pkg/tcpip/network/fragmentation/reassembler_test.go
index 2ff03eeeb..214a93709 100644
--- a/pkg/tcpip/network/fragmentation/reassembler_test.go
+++ b/pkg/tcpip/network/fragmentation/reassembler_test.go
@@ -15,6 +15,7 @@
package fragmentation
import (
+ "bytes"
"math"
"testing"
@@ -44,16 +45,21 @@ func TestReassemblerProcess(t *testing.T) {
return payload
}
- pkt := func(size int) *stack.PacketBuffer {
+ pkt := func(sizes ...int) *stack.PacketBuffer {
+ var vv buffer.VectorisedView
+ for _, size := range sizes {
+ vv.AppendView(v(size))
+ }
return stack.NewPacketBuffer(stack.PacketBufferOptions{
- Data: v(size).ToVectorisedView(),
+ Data: vv,
})
}
var tests = []struct {
- name string
- params []processParams
- want []hole
+ name string
+ params []processParams
+ want []hole
+ wantPkt *stack.PacketBuffer
}{
{
name: "No fragments",
@@ -64,7 +70,7 @@ func TestReassemblerProcess(t *testing.T) {
name: "One fragment at beginning",
params: []processParams{{first: 0, last: 1, more: true, pkt: pkt(2), wantDone: false, wantError: nil}},
want: []hole{
- {first: 0, last: 1, filled: true, final: false, data: v(2)},
+ {first: 0, last: 1, filled: true, final: false, pkt: pkt(2)},
{first: 2, last: math.MaxUint16, filled: false, final: true},
},
},
@@ -72,7 +78,7 @@ func TestReassemblerProcess(t *testing.T) {
name: "One fragment in the middle",
params: []processParams{{first: 1, last: 2, more: true, pkt: pkt(2), wantDone: false, wantError: nil}},
want: []hole{
- {first: 1, last: 2, filled: true, final: false, data: v(2)},
+ {first: 1, last: 2, filled: true, final: false, pkt: pkt(2)},
{first: 0, last: 0, filled: false, final: false},
{first: 3, last: math.MaxUint16, filled: false, final: true},
},
@@ -81,7 +87,7 @@ func TestReassemblerProcess(t *testing.T) {
name: "One fragment at the end",
params: []processParams{{first: 1, last: 2, more: false, pkt: pkt(2), wantDone: false, wantError: nil}},
want: []hole{
- {first: 1, last: 2, filled: true, final: true, data: v(2)},
+ {first: 1, last: 2, filled: true, final: true, pkt: pkt(2)},
{first: 0, last: 0, filled: false},
},
},
@@ -89,8 +95,9 @@ func TestReassemblerProcess(t *testing.T) {
name: "One fragment completing a packet",
params: []processParams{{first: 0, last: 1, more: false, pkt: pkt(2), wantDone: true, wantError: nil}},
want: []hole{
- {first: 0, last: 1, filled: true, final: true, data: v(2)},
+ {first: 0, last: 1, filled: true, final: true},
},
+ wantPkt: pkt(2),
},
{
name: "Two fragments completing a packet",
@@ -99,9 +106,10 @@ func TestReassemblerProcess(t *testing.T) {
{first: 2, last: 3, more: false, pkt: pkt(2), wantDone: true, wantError: nil},
},
want: []hole{
- {first: 0, last: 1, filled: true, final: false, data: v(2)},
- {first: 2, last: 3, filled: true, final: true, data: v(2)},
+ {first: 0, last: 1, filled: true, final: false},
+ {first: 2, last: 3, filled: true, final: true},
},
+ wantPkt: pkt(2, 2),
},
{
name: "Two fragments completing a packet with a duplicate",
@@ -111,9 +119,10 @@ func TestReassemblerProcess(t *testing.T) {
{first: 2, last: 3, more: false, pkt: pkt(2), wantDone: true, wantError: nil},
},
want: []hole{
- {first: 0, last: 1, filled: true, final: false, data: v(2)},
- {first: 2, last: 3, filled: true, final: true, data: v(2)},
+ {first: 0, last: 1, filled: true, final: false},
+ {first: 2, last: 3, filled: true, final: true},
},
+ wantPkt: pkt(2, 2),
},
{
name: "Two fragments completing a packet with a partial duplicate",
@@ -123,9 +132,10 @@ func TestReassemblerProcess(t *testing.T) {
{first: 4, last: 5, more: false, pkt: pkt(2), wantDone: true, wantError: nil},
},
want: []hole{
- {first: 0, last: 3, filled: true, final: false, data: v(4)},
- {first: 4, last: 5, filled: true, final: true, data: v(2)},
+ {first: 0, last: 3, filled: true, final: false},
+ {first: 4, last: 5, filled: true, final: true},
},
+ wantPkt: pkt(4, 2),
},
{
name: "Two overlapping fragments",
@@ -134,7 +144,7 @@ func TestReassemblerProcess(t *testing.T) {
{first: 5, last: 15, more: false, pkt: pkt(11), wantDone: false, wantError: ErrFragmentOverlap},
},
want: []hole{
- {first: 0, last: 10, filled: true, final: false, data: v(11)},
+ {first: 0, last: 10, filled: true, final: false, pkt: pkt(11)},
{first: 11, last: math.MaxUint16, filled: false, final: true},
},
},
@@ -145,7 +155,7 @@ func TestReassemblerProcess(t *testing.T) {
{first: 0, last: 9, more: false, pkt: pkt(10), wantDone: false, wantError: ErrFragmentConflict},
},
want: []hole{
- {first: 10, last: 14, filled: true, final: true, data: v(5)},
+ {first: 10, last: 14, filled: true, final: true, pkt: pkt(5)},
{first: 0, last: 9, filled: false, final: false},
},
},
@@ -156,7 +166,7 @@ func TestReassemblerProcess(t *testing.T) {
{first: 10, last: 14, more: false, pkt: pkt(5), wantDone: false, wantError: nil},
},
want: []hole{
- {first: 5, last: 14, filled: true, final: true, data: v(10)},
+ {first: 5, last: 14, filled: true, final: true, pkt: pkt(10)},
{first: 0, last: 4, filled: false, final: false},
},
},
@@ -167,7 +177,7 @@ func TestReassemblerProcess(t *testing.T) {
{first: 10, last: 13, more: false, pkt: pkt(4), wantDone: false, wantError: ErrFragmentConflict},
},
want: []hole{
- {first: 5, last: 14, filled: true, final: true, data: v(10)},
+ {first: 5, last: 14, filled: true, final: true, pkt: pkt(10)},
{first: 0, last: 4, filled: false, final: false},
},
},
@@ -176,14 +186,47 @@ func TestReassemblerProcess(t *testing.T) {
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
r := newReassembler(FragmentID{}, &faketime.NullClock{})
+ var resPkt *stack.PacketBuffer
+ var isDone bool
for _, param := range test.params {
- _, _, done, _, err := r.process(param.first, param.last, param.more, proto, param.pkt)
+ pkt, _, done, _, err := r.process(param.first, param.last, param.more, proto, param.pkt)
if done != param.wantDone || err != param.wantError {
t.Errorf("got r.process(%d, %d, %t, %d, _) = (_, _, %t, _, %v), want = (%t, %v)", param.first, param.last, param.more, proto, done, err, param.wantDone, param.wantError)
}
+ if done {
+ resPkt = pkt
+ isDone = true
+ }
+ }
+
+ ignorePkt := func(a, b *stack.PacketBuffer) bool { return true }
+ cmpPktData := func(a, b *stack.PacketBuffer) bool {
+ if a == nil || b == nil {
+ return a == b
+ }
+ return bytes.Equal(a.Data.ToOwnedView(), b.Data.ToOwnedView())
}
- if diff := cmp.Diff(test.want, r.holes, cmp.AllowUnexported(hole{})); diff != "" {
- t.Errorf("r.holes mismatch (-want +got):\n%s", diff)
+
+ if isDone {
+ if diff := cmp.Diff(
+ test.want, r.holes,
+ cmp.AllowUnexported(hole{}),
+ // Do not compare pkt in hole. Data will be altered.
+ cmp.Comparer(ignorePkt),
+ ); diff != "" {
+ t.Errorf("r.holes mismatch (-want +got):\n%s", diff)
+ }
+ if diff := cmp.Diff(test.wantPkt, resPkt, cmp.Comparer(cmpPktData)); diff != "" {
+ t.Errorf("Reassembled pkt mismatch (-want +got):\n%s", diff)
+ }
+ } else {
+ if diff := cmp.Diff(
+ test.want, r.holes,
+ cmp.AllowUnexported(hole{}),
+ cmp.Comparer(cmpPktData),
+ ); diff != "" {
+ t.Errorf("r.holes mismatch (-want +got):\n%s", diff)
+ }
}
})
}
diff --git a/pkg/tcpip/network/ipv4/BUILD b/pkg/tcpip/network/ipv4/BUILD
index 330a7d170..9713c4448 100644
--- a/pkg/tcpip/network/ipv4/BUILD
+++ b/pkg/tcpip/network/ipv4/BUILD
@@ -44,6 +44,7 @@ go_test(
"//pkg/tcpip/network/testutil",
"//pkg/tcpip/stack",
"//pkg/tcpip/transport/icmp",
+ "//pkg/tcpip/transport/raw",
"//pkg/tcpip/transport/tcp",
"//pkg/tcpip/transport/udp",
"//pkg/waiter",
diff --git a/pkg/tcpip/network/ipv4/ipv4.go b/pkg/tcpip/network/ipv4/ipv4.go
index b0703715a..04c6a6708 100644
--- a/pkg/tcpip/network/ipv4/ipv4.go
+++ b/pkg/tcpip/network/ipv4/ipv4.go
@@ -740,7 +740,7 @@ func (e *endpoint) handlePacket(pkt *stack.PacketBuffer) {
}
proto := h.Protocol()
- data, _, ready, err := e.protocol.fragmentation.Process(
+ resPkt, _, ready, err := e.protocol.fragmentation.Process(
// As per RFC 791 section 2.3, the identification value is unique
// for a source-destination pair and protocol.
fragmentation.FragmentID{
@@ -763,7 +763,8 @@ func (e *endpoint) handlePacket(pkt *stack.PacketBuffer) {
if !ready {
return
}
- pkt.Data = data
+ pkt = resPkt
+ h = header.IPv4(pkt.NetworkHeader().View())
// The reassembler doesn't take care of fixing up the header, so we need
// to do it here.
diff --git a/pkg/tcpip/network/ipv4/ipv4_test.go b/pkg/tcpip/network/ipv4/ipv4_test.go
index ed5899f0b..a296bed79 100644
--- a/pkg/tcpip/network/ipv4/ipv4_test.go
+++ b/pkg/tcpip/network/ipv4/ipv4_test.go
@@ -38,6 +38,7 @@ import (
"gvisor.dev/gvisor/pkg/tcpip/network/testutil"
"gvisor.dev/gvisor/pkg/tcpip/stack"
"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
+ "gvisor.dev/gvisor/pkg/tcpip/transport/raw"
"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
"gvisor.dev/gvisor/pkg/waiter"
@@ -2058,7 +2059,7 @@ func TestReceiveFragments(t *testing.T) {
// the fragment block size of 8 (RFC 791 section 3.1 page 14).
ipv4Payload3Addr1ToAddr2 := udpGen(127, 3, addr1, addr2)
udpPayload3Addr1ToAddr2 := ipv4Payload3Addr1ToAddr2[header.UDPMinimumSize:]
- // Used to test the max reassembled payload length (65,535 octets).
+ // Used to test the max reassembled IPv4 payload length.
ipv4Payload4Addr1ToAddr2 := udpGen(header.UDPMaximumSize-header.UDPMinimumSize, 4, addr1, addr2)
udpPayload4Addr1ToAddr2 := ipv4Payload4Addr1ToAddr2[header.UDPMinimumSize:]
@@ -2406,6 +2407,7 @@ func TestReceiveFragments(t *testing.T) {
s := stack.New(stack.Options{
NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol},
TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol},
+ RawFactory: raw.EndpointFactory{},
})
e := channel.New(0, 1280, tcpip.LinkAddress("\xf0\x00"))
if err := s.CreateNIC(nicID, e); err != nil {
@@ -2431,6 +2433,13 @@ func TestReceiveFragments(t *testing.T) {
t.Fatalf("Bind(%+v): %s", bindAddr, err)
}
+ // Bring up a raw endpoint so we can examine network headers.
+ epRaw, err := s.NewRawEndpoint(udp.ProtocolNumber, header.IPv4ProtocolNumber, &wq, true /* associated */)
+ if err != nil {
+ t.Fatalf("NewRawEndpoint(%d, %d, _, true): %s", udp.ProtocolNumber, header.IPv4ProtocolNumber, err)
+ }
+ defer epRaw.Close()
+
// Prepare and send the fragments.
for _, frag := range test.fragments {
hdr := buffer.NewPrependable(header.IPv4MinimumSize)
@@ -2462,10 +2471,11 @@ func TestReceiveFragments(t *testing.T) {
}
for i, expectedPayload := range test.expectedPayloads {
+ // Check UDP payload delivered by UDP endpoint.
var buf bytes.Buffer
result, err := ep.Read(&buf, tcpip.ReadOptions{})
if err != nil {
- t.Fatalf("(i=%d) Read: %s", i, err)
+ t.Fatalf("(i=%d) ep.Read: %s", i, err)
}
if diff := cmp.Diff(tcpip.ReadResult{
Count: len(expectedPayload),
@@ -2474,7 +2484,24 @@ func TestReceiveFragments(t *testing.T) {
t.Errorf("(i=%d) ep.Read: unexpected result (-want +got):\n%s", i, diff)
}
if diff := cmp.Diff(expectedPayload, buf.Bytes()); diff != "" {
- t.Errorf("(i=%d) got UDP payload mismatch (-want +got):\n%s", i, diff)
+ t.Errorf("(i=%d) ep.Read: UDP payload mismatch (-want +got):\n%s", i, diff)
+ }
+
+ // Check IPv4 header in packet delivered by raw endpoint.
+ buf.Reset()
+ result, err = epRaw.Read(&buf, tcpip.ReadOptions{})
+ if err != nil {
+ t.Fatalf("(i=%d) epRaw.Read: %s", i, err)
+ }
+ // Reassambly does not take care of checksum. Here we write our own
+ // check routine instead of using checker.IPv4.
+ ip := header.IPv4(buf.Bytes())
+ for _, check := range []checker.NetworkChecker{
+ checker.FragmentFlags(0),
+ checker.FragmentOffset(0),
+ checker.IPFullLength(uint16(header.IPv4MinimumSize + header.UDPMinimumSize + len(expectedPayload))),
+ } {
+ check(t, []header.Network{ip})
}
}
diff --git a/pkg/tcpip/network/ipv6/ipv6.go b/pkg/tcpip/network/ipv6/ipv6.go
index 94043ed4e..caa62b3a2 100644
--- a/pkg/tcpip/network/ipv6/ipv6.go
+++ b/pkg/tcpip/network/ipv6/ipv6.go
@@ -1167,7 +1167,7 @@ func (e *endpoint) handlePacket(pkt *stack.PacketBuffer) {
// Note that pkt doesn't have its transport header set after reassembly,
// and won't until DeliverNetworkPacket sets it.
- data, proto, ready, err := e.protocol.fragmentation.Process(
+ resPkt, proto, ready, err := e.protocol.fragmentation.Process(
// IPv6 ignores the Protocol field since the ID only needs to be unique
// across source-destination pairs, as per RFC 8200 section 4.5.
fragmentation.FragmentID{
@@ -1188,7 +1188,7 @@ func (e *endpoint) handlePacket(pkt *stack.PacketBuffer) {
}
if ready {
- pkt.Data = data
+ pkt = resPkt
// We create a new iterator with the reassembled packet because we could
// have more extension headers in the reassembled payload, as per RFC
diff --git a/pkg/tcpip/stack/BUILD b/pkg/tcpip/stack/BUILD
index bb30556cf..ee23c9b98 100644
--- a/pkg/tcpip/stack/BUILD
+++ b/pkg/tcpip/stack/BUILD
@@ -72,6 +72,7 @@ go_library(
"nud.go",
"packet_buffer.go",
"packet_buffer_list.go",
+ "packet_buffer_unsafe.go",
"pending_packets.go",
"rand.go",
"registration.go",
diff --git a/pkg/tcpip/stack/packet_buffer.go b/pkg/tcpip/stack/packet_buffer.go
index 9d4fc3e48..4f013b212 100644
--- a/pkg/tcpip/stack/packet_buffer.go
+++ b/pkg/tcpip/stack/packet_buffer.go
@@ -187,6 +187,12 @@ func (pk *PacketBuffer) Size() int {
return pk.HeaderSize() + pk.Data.Size()
}
+// MemSize returns the estimation size of the pk in memory, including backing
+// buffer data.
+func (pk *PacketBuffer) MemSize() int {
+ return pk.HeaderSize() + pk.Data.MemSize() + packetBufferStructSize
+}
+
// Views returns the underlying storage of the whole packet.
func (pk *PacketBuffer) Views() []buffer.View {
// Optimization for outbound packets that headers are in pk.header.
diff --git a/pkg/tcpip/stack/packet_buffer_unsafe.go b/pkg/tcpip/stack/packet_buffer_unsafe.go
new file mode 100644
index 000000000..ee3d47270
--- /dev/null
+++ b/pkg/tcpip/stack/packet_buffer_unsafe.go
@@ -0,0 +1,19 @@
+// Copyright 2021 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 stack
+
+import "unsafe"
+
+const packetBufferStructSize = int(unsafe.Sizeof(PacketBuffer{}))
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 03:48:49 +0000