Support /proc/net/dev

This proc file reports the stats of interfaces. We could use ifconfig
command to check the result.

Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com>
Change-Id: Ia7c1e637f5c76c30791ffda68ee61e861b6ef827
COPYBARA_INTEGRATE_REVIEW=https://gvisor-review.googlesource.com/c/gvisor/+/18282/
PiperOrigin-RevId: 258303936

3 files changed, 15 insertions, 0 deletions

diff --git a/pkg/sentry/socket/epsocket/stack.go b/pkg/sentry/socket/epsocket/stack.go
index 1627a4f68..7eef19f74 100644
--- a/pkg/sentry/socket/epsocket/stack.go
+++ b/pkg/sentry/socket/epsocket/stack.go
@@ -138,3 +138,8 @@ func (s *Stack) TCPSACKEnabled() (bool, error) {
 func (s *Stack) SetTCPSACKEnabled(enabled bool) error {
 	return syserr.TranslateNetstackError(s.Stack.SetTransportProtocolOption(tcp.ProtocolNumber, tcp.SACKEnabled(enabled))).ToError()
 }
+
+// Statistics implements inet.Stack.Statistics.
+func (s *Stack) Statistics(stat interface{}, arg string) error {
+	return syserr.ErrEndpointOperation.ToError()
+}
diff --git a/pkg/sentry/socket/hostinet/stack.go b/pkg/sentry/socket/hostinet/stack.go
index 11f94281c..cc1f66fa1 100644
--- a/pkg/sentry/socket/hostinet/stack.go
+++ b/pkg/sentry/socket/hostinet/stack.go
@@ -244,3 +244,8 @@ func (s *Stack) TCPSACKEnabled() (bool, error) {
 func (s *Stack) SetTCPSACKEnabled(enabled bool) error {
 	return syserror.EACCES
 }
+
+// Statistics implements inet.Stack.Statistics.
+func (s *Stack) Statistics(stat interface{}, arg string) error {
+	return syserror.EOPNOTSUPP
+}
diff --git a/pkg/sentry/socket/rpcinet/stack.go b/pkg/sentry/socket/rpcinet/stack.go
index 3038f25a7..49bd3a220 100644
--- a/pkg/sentry/socket/rpcinet/stack.go
+++ b/pkg/sentry/socket/rpcinet/stack.go
@@ -133,3 +133,8 @@ func (s *Stack) TCPSACKEnabled() (bool, error) {
 func (s *Stack) SetTCPSACKEnabled(enabled bool) error {
 	panic("rpcinet handles procfs directly this method should not be called")
 }
+
+// Statistics implements inet.Stack.Statistics.
+func (s *Stack) Statistics(stat interface{}, arg string) error {
+	return syserr.ErrEndpointOperation.ToError()
+}