Add support for Stack level options.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/benchmarks/tcp/tcp_proxy.go b/benchmarks/tcp/tcp_proxy.go
index b3a4dbea3..4b7ca7a14 100644
--- a/benchmarks/tcp/tcp_proxy.go
+++ b/benchmarks/tcp/tcp_proxy.go
@@ -228,7 +228,7 @@ func newNetstackImpl(mode string) (impl, error) {
 	})
 
 	// Set protocol options.
-	if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, tcpip.StackSACKEnabled(*sack)); err != nil {
+	if err := s.SetTransportProtocolOption(tcp.ProtocolNumber, tcp.SACKEnabled(*sack)); err != nil {
 		return nil, fmt.Errorf("SetTransportProtocolOption for SACKEnabled failed: %s", err)
 	}