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Commit fe640f05 authored by Hansen Kurli's avatar Hansen Kurli
Browse files

Set TCP_MAXSEG to 1220 for better reliability. 

Set the maximum segment size for outgoing TCP packets to a suitably low
value of 1220.
In some cases, such as in VPN networks, the TCP MSS value announced
could be too large, causing packets to be lost.

Bug: 246398088
Test: Manual test: Build, flash, boot.
Test: Connect to private dns, confirm announced MSS in tcpdump.
Change-Id: I4b72e27fe283951bc6f2bf44ee0fd802e133f812
parent 37a894be

DnsTlsSocket.cpp

+6 −0
Original line number Diff line number Diff line
@@ -94,6 +94,12 @@ Status DnsTlsSocket::tcpConnect() { 
        return Status(err);

    }



    // Set TCP MSS to a suitably low value to be more reliable.

    const int v = 1220;

    if (setsockopt(mSslFd.get(), SOL_TCP, TCP_MAXSEG, &v, sizeof(v)) == -1) {

        LOG(WARNING) << "Failed to set TCP_MAXSEG: " << errno;

    }



    const Status tfo = enableSockopt(mSslFd.get(), SOL_TCP, TCP_FASTOPEN_CONNECT);

    if (!isOk(tfo) && tfo.code() != ENOPROTOOPT) {

        LOG(WARNING) << "Failed to enable TFO: " << tfo.msg();