2014-08-15 15:56:15 +02:00
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/**
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* \brief TUN/TAP to Nic_session interface
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* \author Josef Soentgen
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* \date 2014-06-05
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*/
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/*
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2015-03-11 11:33:03 +01:00
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* Copyright (C) 2014-2015 Genode Labs GmbH
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2014-08-15 15:56:15 +02:00
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <os/server.h>
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#include <os/config.h>
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#include <os/static_root.h>
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#include <cap_session/connection.h>
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#include <nic/component.h>
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#include <root/component.h>
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/* libc includes */
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#include <unistd.h>
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/* local includes */
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#include "tuntap.h"
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static int const verbose = false;
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#define PDBGV(...) if (verbose) PDBG(__VA_ARGS__)
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/* external symbols provided by Genode's startup code */
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extern char **genode_argv;
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extern int genode_argc;
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/*********************************
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** OpenVPN main thread wrapper **
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*********************************/
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extern "C" int openvpn_main(int, char*[]);
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class Openvpn_thread : public Genode::Thread<16UL * 1024 * sizeof (long)>
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{
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private:
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int _argc;
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char **_argv;
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int _exitcode;
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public:
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Openvpn_thread(int argc, char *argv[])
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:
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Thread("openvpn_main"),
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_argc(argc), _argv(argv),
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_exitcode(-1)
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{
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//for (int i = 0; i < _argc; i++)
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// PINF("_argv[%i]: '%s'", i, _argv[i]);
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}
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void entry()
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{
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_exitcode = ::openvpn_main(_argc, _argv);
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};
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};
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static Tuntap_device* _tuntap_dev;
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Tuntap_device *tuntap_dev()
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{
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return _tuntap_dev;
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}
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/***************************************
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** Implementation of the Nic service **
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***************************************/
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class Nic_driver : public Tuntap_device,
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public Nic::Driver
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{
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private:
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2015-03-11 11:33:03 +01:00
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Nic::Mac_address _mac_addr {{ 0x02, 0x00, 0x00, 0x00, 0x00, 0x01 }};
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Nic::Rx_buffer_alloc &_alloc;
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Nic::Driver_notification &_notify;
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2014-08-15 15:56:15 +02:00
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char const *_packet;
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enum { READ = 0, WRITE = 1 };
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int _pipefd[2];
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Genode::Semaphore _startup_lock;
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Genode::Semaphore _tx_lock;
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public:
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2015-03-11 11:33:03 +01:00
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Nic_driver(Nic::Rx_buffer_alloc &alloc, Nic::Driver_notification ¬ify)
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2014-08-15 15:56:15 +02:00
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2015-03-11 11:33:03 +01:00
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_alloc(alloc), _notify(notify), _packet(0)
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2014-08-15 15:56:15 +02:00
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{
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if (pipe(_pipefd)) {
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PERR("could not create pipe");
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throw Genode::Exception();
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}
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}
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~Nic_driver() { PDBG("should probably be implemented"); }
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2015-03-11 11:33:03 +01:00
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void link_state_changed() { _notify.link_state_changed(); }
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2014-08-15 15:56:15 +02:00
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/***************************
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** Nic::Driver interface **
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***************************/
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Nic::Mac_address mac_address() { return _mac_addr; }
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2015-03-11 11:33:03 +01:00
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bool link_state()
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{
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/* XXX always return true for now */
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return true;
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}
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2014-08-15 15:56:15 +02:00
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void tx(char const *packet, Genode::size_t size)
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{
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PDBGV("packet:0x%p size:%zu", packet, size);
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_packet = packet;
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/* notify openvpn */
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::write(_pipefd[WRITE], "1", 1);
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/* block while openvpn handles the packet */
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_tx_lock.down();
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}
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/******************************
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** Irq_activation interface **
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******************************/
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void handle_irq(int) { }
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/***********************
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** TUN/TAP interface **
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***********************/
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int fd() { return _pipefd[READ]; }
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/* tx */
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int read(char *buf, Genode::size_t len)
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{
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PDBGV("buf:0x%p len:%zu", len);
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Genode::memcpy(buf, _packet, len);
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_packet = 0;
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/* unblock nic client */
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_tx_lock.up();
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return len;
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}
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/* rx */
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int write(char const *buf, Genode::size_t len)
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{
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PDBGV("buf:0x%p len:%zu", len);
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void *buffer = _alloc.alloc(len);
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Genode::memcpy(buffer, buf, len);
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_alloc.submit();
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return len;
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}
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void up() { _startup_lock.up(); }
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void down() { _startup_lock.down(); }
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};
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struct Main
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{
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struct Nic_driver_factory : Nic::Driver_factory
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{
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Nic_driver *drv { 0 };
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Openvpn_thread *openvpn { 0 };
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2015-03-11 11:33:03 +01:00
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Nic::Driver *create(Nic::Rx_buffer_alloc &alloc,
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Nic::Driver_notification ¬ify)
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2014-08-15 15:56:15 +02:00
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{
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/* there can be only one */
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if (!drv) {
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2015-03-11 11:33:03 +01:00
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drv = new (Genode::env()->heap()) Nic_driver(alloc, notify);
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2014-08-15 15:56:15 +02:00
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/**
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* Setting the pointer in this manner is quite hackish but it has
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* to be valid before OpenVPN calls open_tun(), which unfortunatly
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* is early.
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*/
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_tuntap_dev = drv;
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PDBGV("start OpenVPN main thread");
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Openvpn_thread *openvpn = new (Genode::env()->heap()) Openvpn_thread(genode_argc,
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genode_argv);
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openvpn->start();
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/* wait until OpenVPN configured the TUN/TAP device for the first time */
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_tuntap_dev->down();
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return drv;
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}
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return 0;
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}
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void destroy(Nic::Driver *driver)
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{
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Genode::destroy(Genode::env()->heap(), static_cast<Nic_driver *>(driver));
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drv = 0;
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Genode::destroy(Genode::env()->heap(), openvpn);
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openvpn = 0;
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}
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} driver_factory;
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Server::Entrypoint &ep;
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Main(Server::Entrypoint &ep) : ep(ep)
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{
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static Nic::Root nic_root(&ep.rpc_ep(), Genode::env()->heap(), driver_factory);
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Genode::env()->parent()->announce(ep.manage(nic_root));
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}
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};
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/**********************
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** Server framework **
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**********************/
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namespace Server {
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char const *name() { return "openvpn_ep"; }
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size_t stack_size() { return 8 * 1024 * sizeof (addr_t); }
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void construct(Entrypoint &ep) { static Main server(ep); }
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}
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