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ipn/ipnlocal: add start of handling TCP proxying

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Updates tailscale/corp#7515

Change-Id: I82d19b5864674b2169f25ec8e429f60a543e0c57
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-11-09 15:38:09 -08:00
committed by Brad Fitzpatrick
parent 4bccc02413
commit b683921b87
2 changed files with 69 additions and 11 deletions
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13
wgengine/netstack/netstack.go
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@ -784,6 +784,8 @@ func (ns *Impl) acceptTCP(r *tcp.ForwarderRequest) {
r.Complete(true) // sends a RST
return
}
clientRemotePort := reqDetails.RemotePort
clientRemoteAddrPort := netip.AddrPortFrom(clientRemoteIP, clientRemotePort)
dialIP := netaddrIPFromNetstackIP(reqDetails.LocalAddress)
isTailscaleIP := tsaddr.IsTailscaleIP(dialIP)
@ -894,11 +896,14 @@ func (ns *Impl) acceptTCP(r *tcp.ForwarderRequest) {
return
}
if ns.lb.ShouldInterceptTCPPort(reqDetails.LocalPort) && ns.isLocalIP(dialIP) {
c := createConn()
if c == nil {
return
getTCPConn := func() (_ net.Conn, ok bool) {
c := createConn()
return c, c != nil
}
ns.lb.HandleInterceptedTCPConn(c)
sendRST := func() {
r.Complete(true)
}
ns.lb.HandleInterceptedTCPConn(reqDetails.LocalPort, clientRemoteAddrPort, getTCPConn, sendRST)
return
}
}