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Add support for Stack level options.

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Linux controls socket send/receive buffers using a few sysctl variables
  - net.core.rmem_default
  - net.core.rmem_max
  - net.core.wmem_max
  - net.core.wmem_default
  - net.ipv4.tcp_rmem
  - net.ipv4.tcp_wmem

The first 4 control the default socket buffer sizes for all sockets
raw/packet/tcp/udp and also the maximum permitted socket buffer that can be
specified in setsockopt(SOL_SOCKET, SO_(RCV|SND)BUF,...).

The last two control the TCP auto-tuning limits and override the default
specified in rmem_default/wmem_default as well as the max limits.

Netstack today only implements tcp_rmem/tcp_wmem and incorrectly uses it
to limit the maximum size in setsockopt() as well as uses it for raw/udp
sockets.

This changelist introduces the other 4 and updates the udp/raw sockets to use
the newly introduced variables. The values for min/max match the current
tcp_rmem/wmem values and the default value buffers for UDP/RAW sockets is
updated to match the linux value of 212KiB up from the really low current value
of 32 KiB.

Updates #3043
Fixes #3043

PiperOrigin-RevId: 318089805
This commit is contained in:
Bhasker Hariharan
2020-06-24 10:24:20 -07:00
committed by gVisor bot
parent 364ac92baf
commit b070e218c6
18 changed files with 306 additions and 140 deletions
Download Patch File Download Diff File Expand all files Collapse all files
pkg/sentry/socket/netstack/stack.go
+6 -6
View File
@@ -143,7 +143,7 @@ func (s *Stack) AddInterfaceAddr(idx int32, addr inet.InterfaceAddr) error {
// TCPReceiveBufferSize implements inet.Stack.TCPReceiveBufferSize.
func (s *Stack) TCPReceiveBufferSize() (inet.TCPBufferSize, error) {
var rs tcpip.StackReceiveBufferSizeOption
var rs tcp.ReceiveBufferSizeOption
err := s.Stack.TransportProtocolOption(tcp.ProtocolNumber, &rs)
return inet.TCPBufferSize{
Min: rs.Min,
@@ -154,7 +154,7 @@ func (s *Stack) TCPReceiveBufferSize() (inet.TCPBufferSize, error) {
// SetTCPReceiveBufferSize implements inet.Stack.SetTCPReceiveBufferSize.
func (s *Stack) SetTCPReceiveBufferSize(size inet.TCPBufferSize) error {
rs := tcpip.StackReceiveBufferSizeOption{
rs := tcp.ReceiveBufferSizeOption{
Min: size.Min,
Default: size.Default,
Max: size.Max,
@@ -164,7 +164,7 @@ func (s *Stack) SetTCPReceiveBufferSize(size inet.TCPBufferSize) error {
// TCPSendBufferSize implements inet.Stack.TCPSendBufferSize.
func (s *Stack) TCPSendBufferSize() (inet.TCPBufferSize, error) {
var ss tcpip.StackSendBufferSizeOption
var ss tcp.SendBufferSizeOption
err := s.Stack.TransportProtocolOption(tcp.ProtocolNumber, &ss)
return inet.TCPBufferSize{
Min: ss.Min,
@@ -175,7 +175,7 @@ func (s *Stack) TCPSendBufferSize() (inet.TCPBufferSize, error) {
// SetTCPSendBufferSize implements inet.Stack.SetTCPSendBufferSize.
func (s *Stack) SetTCPSendBufferSize(size inet.TCPBufferSize) error {
ss := tcpip.StackSendBufferSizeOption{
ss := tcp.SendBufferSizeOption{
Min: size.Min,
Default: size.Default,
Max: size.Max,
@@ -185,14 +185,14 @@ func (s *Stack) SetTCPSendBufferSize(size inet.TCPBufferSize) error {
// TCPSACKEnabled implements inet.Stack.TCPSACKEnabled.
func (s *Stack) TCPSACKEnabled() (bool, error) {
var sack tcpip.StackSACKEnabled
var sack tcp.SACKEnabled
err := s.Stack.TransportProtocolOption(tcp.ProtocolNumber, &sack)
return bool(sack), syserr.TranslateNetstackError(err).ToError()
}
// SetTCPSACKEnabled implements inet.Stack.SetTCPSACKEnabled.
func (s *Stack) SetTCPSACKEnabled(enabled bool) error {
return syserr.TranslateNetstackError(s.Stack.SetTransportProtocolOption(tcp.ProtocolNumber, tcpip.StackSACKEnabled(enabled))).ToError()
return syserr.TranslateNetstackError(s.Stack.SetTransportProtocolOption(tcp.ProtocolNumber, tcp.SACKEnabled(enabled))).ToError()
}
// Statistics implements inet.Stack.Statistics.