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| author | Bhasker Hariharan <bhaskerh@google.com> | 2020-08-13 09:02:18 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-08-13 09:04:31 -0700 |
| commit | b928d074b461c6f2578c989e48adadc951ed3154 (patch) | |
| tree | 6c85c5205531c64022ace80f198da6ffd40b4d8e /pkg/tcpip/header/ipv4.go | |
| parent | 36134667b289a3e96e90abf9e18e1c2137069d6b (diff) | |
Ensure TCP TIME-WAIT is not terminated prematurely.
Netstack's TIME-WAIT state for a TCP socket could be terminated prematurely if
the socket entered TIME-WAIT using shutdown(..., SHUT_RDWR) and then was closed
using close(). This fixes that bug and updates the tests to verify that Netstack
correctly honors TIME-WAIT under such conditions.
Fixes #3106
PiperOrigin-RevId: 326456443
Diffstat (limited to 'pkg/tcpip/header/ipv4.go')
| -rw-r--r-- | pkg/tcpip/header/ipv4.go | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/pkg/tcpip/header/ipv4.go b/pkg/tcpip/header/ipv4.go index d0d1efd0d..680eafd16 100644 --- a/pkg/tcpip/header/ipv4.go +++ b/pkg/tcpip/header/ipv4.go @@ -315,3 +315,12 @@ func IsV4MulticastAddress(addr tcpip.Address) bool { } return (addr[0] & 0xf0) == 0xe0 } + +// IsV4LoopbackAddress determines if the provided address is an IPv4 loopback +// address (belongs to 127.0.0.1/8 subnet). +func IsV4LoopbackAddress(addr tcpip.Address) bool { + if len(addr) != IPv4AddressSize { + return false + } + return addr[0] == 0x7f +} |