diff options
Diffstat (limited to 'pkg/tcpip/header/tcp.go')
| -rw-r--r-- | pkg/tcpip/header/tcp.go | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/pkg/tcpip/header/tcp.go b/pkg/tcpip/header/tcp.go index 0cd89b992..82cfe785c 100644 --- a/pkg/tcpip/header/tcp.go +++ b/pkg/tcpip/header/tcp.go @@ -18,8 +18,8 @@ import ( "encoding/binary" "github.com/google/btree" - "gvisor.googlesource.com/gvisor/pkg/tcpip" - "gvisor.googlesource.com/gvisor/pkg/tcpip/seqnum" + "gvisor.dev/gvisor/pkg/tcpip" + "gvisor.dev/gvisor/pkg/tcpip/seqnum" ) // These constants are the offsets of the respective fields in the TCP header. @@ -176,6 +176,21 @@ const ( // TCPProtocolNumber is TCP's transport protocol number. TCPProtocolNumber tcpip.TransportProtocolNumber = 6 + + // TCPMinimumMSS is the minimum acceptable value for MSS. This is the + // same as the value TCP_MIN_MSS defined net/tcp.h. + TCPMinimumMSS = IPv4MaximumHeaderSize + TCPHeaderMaximumSize + MinIPFragmentPayloadSize - IPv4MinimumSize - TCPMinimumSize + + // TCPMaximumMSS is the maximum acceptable value for MSS. + TCPMaximumMSS = 0xffff + + // TCPDefaultMSS is the MSS value that should be used if an MSS option + // is not received from the peer. It's also the value returned by + // TCP_MAXSEG option for a socket in an unconnected state. + // + // Per RFC 1122, page 85: "If an MSS option is not received at + // connection setup, TCP MUST assume a default send MSS of 536." + TCPDefaultMSS = 536 ) // SourcePort returns the "source port" field of the tcp header. @@ -306,7 +321,7 @@ func ParseSynOptions(opts []byte, isAck bool) TCPSynOptions { synOpts := TCPSynOptions{ // Per RFC 1122, page 85: "If an MSS option is not received at // connection setup, TCP MUST assume a default send MSS of 536." - MSS: 536, + MSS: TCPDefaultMSS, // If no window scale option is specified, WS in options is // returned as -1; this is because the absence of the option // indicates that the we cannot use window scaling on the |