sendObsMsg delivers (op, err) to the observer goroutine via a channel. It never blocks: the caller returns immediately after the send.

updateV4Checksum calculates and updates the checksum in the packet buffer for a change between old and new. The oldSum must point to the 16-bit checks

AcceptTCP creates a listener on the local address. network must be "tcp" or "tcp4" or "tcp6". Helper method for d.Accept("tcp", local)

All returns a slice that contains all elements in the ring buffer

Alloc returns a truncated byte slice of size 4096

Close implements core.UDPConn.Close

Close closes the connection.

ICMP returns the ICMP handler.

CloseTCPRead closes the read end of r.

CloseTCPWrite closes the write end of w.

DID is the Device identifier, if any.

DNS returns the ip:port or doh/dot url or dnscrypt stamp for this proxy.

DNSConfig returns the DNS filter preset configuration csv.

DialTCP creates a net.TCPConn to raddr bound to laddr using dialer d; laddr may be nil.

DialWithSplitRetry returns a TCP connection that transparently retries by splitting the initial upstream segment if the socket closes without receivin

DialWithTls dials into addr using the provided dialer and returns a tls.Conn

Disconfirm2 unmarks addr as preferred for hostOrIP

DumpPacket logs a packet, depending on configuration, to stderr and/or a pcap file. ts is an optional timestamp for the packet.

EchoIDSeq extracts the identifier/sequence bytes from an ICMP Echo response, and returns them as a uint32, used to lookup internally routed ICMP echo

end closes the handler and all its connections.

ExcludeCCs returns the CSV of country codes excluded from CC selection.

GetMultInternal returns multi-transport, if available

Go2 runs f(arg0,arg1) in a goroutine and recovers from any panics.

Gx1 runs f in a goroutine and exits the process if f panics.

Returns true if the cidr route is found.

whether the given msg (ans/query) has a A question section

UDP returns the UDP handler.

Implements x.Router.

InjectInbound ingresses a netstack-inbound packet.

IsDNSSECRequested checks if the DNSSEC OK (DO) bit is set in the DNS query.

IsEchoRequest reports whether q is an ICMP Echo Request.

L3 returns the string'd repr of engine.

Len implements Header.

Listen listens on for TCP connections on the local address using d.

ListenPacket listens on for UDP connections on the local address using d. Returned net.Conn is guaranteed to be a *net.UDPConn.

LiveTransports returns a csv of active transports.

LocalAddr implements core.DuplexConn.

Lookup resolves q over one of the tids. If tids is empty, either dnsx.Default, and if that fails, dnsx.System or dnsx.Goos tids.

LookupNetIPOn is like Lookup but with tids set to some preset IDs on behalf of protect.MyUid.

unused: Creates a dialer that binds to a particular ip.

Creates a net.Dialer that can bind to any active interface.

Converts a given DNS/Block/Pt mode to its string representation. typ is one of "dns", "block", "pt"; mode is the value to convert.

N is a no-op logger.

never resolve system/default/"hostless" resolver; expected to have seeded ips

NewAuthProxyOptions returns a new ProxyOptions object with authentication object.

NewBarrier2 returns a new Barrier with the time-to-lives for completed Vs (ttl) and errored Vs (neg).

ref: github.com/google/gvisor/blob/91f58d2cc/pkg/tcpip/sample/tun_tcp_echo/main.go#L102

NewExpiringMap returns a new ExpMap with min lifetime of 0.

NewIpTree returns a new IpTree.

On (is a hot flow) which immediately calls o (in a separate goroutine) and later calls o on changes to the underlying Volatile variable.

onProtoChange returns true if the proxy must be re-added with cfg on proto changes.

OpenConns returns the number of active connections.

OutboundTCP sets up a TCP forwarder h to handle TCP packets. If h is nil, s uses the (built-in) default TCP forwarding logic.

OutboundUDP sets up a UDP forwarder h for outbound UDP packets. If h is nil, s uses the (built-in) default UDP forwarding logic.

Ping informs if ICMP Echo from src to dst is replied to

Probe sends and accepts ICMP packets on local addr using d over a net.PacketConn.

Proxy copies data between conn and dst (egress). must not block forever as it may block netstack see: netstack/dispatcher.go:newReadvDispatcher

ProxyDial tries to connect to addr using d

ProxyFor returns the proxy for the given id or an error. As a special case, if it takes longer than getproxytimeout, it returns an error. ProxyFor imp

Public returns the public key for the client certificate.

Query sends a DNS query to the Default DNS and returns the answer.

Refresh implements Proxy.

RegisterWin registers (or re-registers) a Windscribe account. ops may be nil to use default behaviour.

TODO: check for hops on "noop" transports; if those are NOT hoppping, then those are NOT remote, either id MUST be valid proxy id (no checks are made

RemoteAddr implements core.DuplexConn.