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-rw-r--r--pkg/sentry/fs/proc/sys_net.go95
1 files changed, 95 insertions, 0 deletions
diff --git a/pkg/sentry/fs/proc/sys_net.go b/pkg/sentry/fs/proc/sys_net.go
index 702fdd392..8615b60f0 100644
--- a/pkg/sentry/fs/proc/sys_net.go
+++ b/pkg/sentry/fs/proc/sys_net.go
@@ -272,6 +272,96 @@ func (f *tcpSackFile) Write(ctx context.Context, _ *fs.File, src usermem.IOSeque
return n, f.tcpSack.stack.SetTCPSACKEnabled(*f.tcpSack.enabled)
}
+// +stateify savable
+type tcpRecovery struct {
+ fsutil.SimpleFileInode
+
+ stack inet.Stack `state:"wait"`
+ recovery inet.TCPLossRecovery
+}
+
+func newTCPRecoveryInode(ctx context.Context, msrc *fs.MountSource, s inet.Stack) *fs.Inode {
+ ts := &tcpRecovery{
+ SimpleFileInode: *fsutil.NewSimpleFileInode(ctx, fs.RootOwner, fs.FilePermsFromMode(0644), linux.PROC_SUPER_MAGIC),
+ stack: s,
+ }
+ sattr := fs.StableAttr{
+ DeviceID: device.ProcDevice.DeviceID(),
+ InodeID: device.ProcDevice.NextIno(),
+ BlockSize: usermem.PageSize,
+ Type: fs.SpecialFile,
+ }
+ return fs.NewInode(ctx, ts, msrc, sattr)
+}
+
+// Truncate implements fs.InodeOperations.Truncate.
+func (*tcpRecovery) Truncate(context.Context, *fs.Inode, int64) error {
+ return nil
+}
+
+// GetFile implements fs.InodeOperations.GetFile.
+func (r *tcpRecovery) GetFile(ctx context.Context, dirent *fs.Dirent, flags fs.FileFlags) (*fs.File, error) {
+ flags.Pread = true
+ flags.Pwrite = true
+ return fs.NewFile(ctx, dirent, flags, &tcpRecoveryFile{
+ tcpRecovery: r,
+ stack: r.stack,
+ }), nil
+}
+
+// +stateify savable
+type tcpRecoveryFile struct {
+ fsutil.FileGenericSeek `state:"nosave"`
+ fsutil.FileNoIoctl `state:"nosave"`
+ fsutil.FileNoMMap `state:"nosave"`
+ fsutil.FileNoSplice `state:"nosave"`
+ fsutil.FileNoopRelease `state:"nosave"`
+ fsutil.FileNoopFlush `state:"nosave"`
+ fsutil.FileNoopFsync `state:"nosave"`
+ fsutil.FileNotDirReaddir `state:"nosave"`
+ fsutil.FileUseInodeUnstableAttr `state:"nosave"`
+ waiter.AlwaysReady `state:"nosave"`
+
+ tcpRecovery *tcpRecovery
+
+ stack inet.Stack `state:"wait"`
+}
+
+// Read implements fs.FileOperations.Read.
+func (f *tcpRecoveryFile) Read(ctx context.Context, _ *fs.File, dst usermem.IOSequence, offset int64) (int64, error) {
+ if offset != 0 {
+ return 0, io.EOF
+ }
+
+ recovery, err := f.stack.TCPRecovery()
+ if err != nil {
+ return 0, err
+ }
+ f.tcpRecovery.recovery = recovery
+ s := fmt.Sprintf("%d\n", f.tcpRecovery.recovery)
+ n, err := dst.CopyOut(ctx, []byte(s))
+ return int64(n), err
+}
+
+// Write implements fs.FileOperations.Write.
+func (f *tcpRecoveryFile) Write(ctx context.Context, _ *fs.File, src usermem.IOSequence, offset int64) (int64, error) {
+ if src.NumBytes() == 0 {
+ return 0, nil
+ }
+ src = src.TakeFirst(usermem.PageSize - 1)
+
+ var v int32
+ n, err := usermem.CopyInt32StringInVec(ctx, src.IO, src.Addrs, &v, src.Opts)
+ if err != nil {
+ return 0, err
+ }
+ f.tcpRecovery.recovery = inet.TCPLossRecovery(v)
+ if err := f.tcpRecovery.stack.SetTCPRecovery(f.tcpRecovery.recovery); err != nil {
+ return 0, err
+ }
+ return n, nil
+}
+
func (p *proc) newSysNetCore(ctx context.Context, msrc *fs.MountSource, s inet.Stack) *fs.Inode {
// The following files are simple stubs until they are implemented in
// netstack, most of these files are configuration related. We use the
@@ -351,6 +441,11 @@ func (p *proc) newSysNetIPv4Dir(ctx context.Context, msrc *fs.MountSource, s ine
contents["tcp_wmem"] = newTCPMemInode(ctx, msrc, s, tcpWMem)
}
+ // Add tcp_recovery.
+ if _, err := s.TCPRecovery(); err == nil {
+ contents["tcp_recovery"] = newTCPRecoveryInode(ctx, msrc, s)
+ }
+
d := ramfs.NewDir(ctx, contents, fs.RootOwner, fs.FilePermsFromMode(0555))
return newProcInode(ctx, d, msrc, fs.SpecialDirectory, nil)
}