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apps/examples/ipforward: Add beginning of an IP forwarding example using only TUN devices.

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This commit is contained in:
Gregory Nutt 2017-07-07 13:07:21 -06:00
parent 013a8a0774
commit 47a42852e5
6 changed files with 442 additions and 0 deletions
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7
examples/README.txt
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@ -681,6 +681,13 @@ examples/i2cchar
each time that this test executes. Not available in the kernel build
mode.
examples/ipforward
^^^^^^^^^^^^^^^^^^
A simple test of IP forwarding using TUN devices. This can be used on any
platform, but was intended for use on the simulation platform because it
performs a test of IP forwarding without the use of hardware.
examples/json
^^^^^^^^^^^^^

11
examples/ipforward/.gitignore vendored Normal file
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@ -0,0 +1,11 @@
/Make.dep
/.depend
/.built
/*.asm
/*.obj
/*.rel
/*.lst
/*.sym
/*.adb
/*.lib
/*.src

31
examples/ipforward/Kconfig Normal file
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@ -0,0 +1,31 @@
#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#
config EXAMPLES_IPFORWARD
bool "IP forwarding example"
default n
depends on NET_TUN && NET_TCP
---help---
Enable the IP forwarding example
if EXAMPLES_IPFORWARD
config EXAMPLES_IPFORWARD_PROGNAME
string "IP forwarding rogram name"
default "ipfwd"
depends on BUILD_KERNEL
---help---
This is the name of the program that will be use when the NSH ELF
program is installed.
config EXAMPLES_IPFORWARD_PRIORITY
int "IP forwarding task priority"
default 100
config EXAMPLES_IPFORWARD_STACKSIZE
int "IP forwarding stack size"
default 2048
endif

39
examples/ipforward/Make.defs Normal file
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@ -0,0 +1,39 @@
############################################################################
# apps/examples/ipforward/Make.defs
# Adds selected applications to apps/ build
#
# Copyright (C) 2017 Gregory Nutt. All rights reserved.
# Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# 3. Neither the name NuttX nor the names of its contributors may be
# used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
############################################################################
ifeq ($(CONFIG_EXAMPLES_IPFORWARD),y)
CONFIGURED_APPS += examples/ipforward
endif

56
examples/ipforward/Makefile Normal file
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@ -0,0 +1,56 @@
############################################################################
# apps/examples/ipforward/Makefile
#
# Copyright (C) 2017 Gregory Nutt. All rights reserved.
# Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# 3. Neither the name NuttX nor the names of its contributors may be
# used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
############################################################################
-include $(TOPDIR)/Make.defs
# Hello, World! built-in application info
CONFIG_EXAMPLES_IPFORWARD_PRIORITY ?= SCHED_PRIORITY_DEFAULT
CONFIG_EXAMPLES_IPFORWARD_STACKSIZE ?= 2048
APPNAME = ipfwd
PRIORITY = $(CONFIG_EXAMPLES_IPFORWARD_PRIORITY)
STACKSIZE = $(CONFIG_EXAMPLES_IPFORWARD_STACKSIZE)
# Hello, World! Example
ASRCS =
CSRCS =
MAINSRC = ipforward.c
CONFIG_EXAMPLES_IPFORWARD_PROGNAME ?= ipfwd$(EXEEXT)
PROGNAME = $(CONFIG_EXAMPLES_IPFORWARD_PROGNAME)
include $(APPDIR)/Application.mk

298
examples/ipforward/ipforward.c Normal file
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@ -0,0 +1,298 @@
/****************************************************************************
* examplex/ipforward/ipforward.c
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <pthread.h>
#include <errno.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <nuttx/net/tun.h>
#include "netutils/netlib.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define MAX_DEVNAME 8
#ifdef CONFIG_NET_IPv6
# define IPADDR_TYPE FAR const uint16_t *
#else
# define IPADDR_TYPE uint32_t
#endif
/****************************************************************************
* Name: Private Types
****************************************************************************/
struct ipfwd_tun_s
{
int it_fd;
char it_devname[MAX_DEVNAME];
};
struct ipfwd_state_s
{
struct ipfwd_tun_s if_tun0;
struct ipfwd_tun_s if_tun1;
};
/****************************************************************************
* Private Data
****************************************************************************/
#ifdef CONFIG_NET_IPv6
static const uint16_t g_tun0_ipaddr[8] =
{
HTONS(0x7c00),
HTONS(0),
HTONS(0),
HTONS(0),
HTONS(0),
HTONS(0),
HTONS(0),
HTONS(0x0097),
};
static const uint16_t g_tun1_ipaddr[8] =
{
HTONS(0x7c00),
HTONS(0),
HTONS(0),
HTONS(0),
HTONS(0),
HTONS(0),
HTONS(0),
HTONS(0x0139),
};
static const uint16_t g_netmask[8] =
{
HTONS(0xffff),
HTONS(0xffff),
HTONS(0xffff),
HTONS(0xffff),
HTONS(0xffff),
HTONS(0xffff),
HTONS(0xffff),
HTONS(0),
};
#else
static const uint32_t g_tun0_ipaddr = HTONL(0x0a000097);
static const uint32_t g_tun1_ipaddr = HTONL(0x0a000039);
static const uint32_t g_netmask = HTONL(0xffffff00);
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: ipfwd_tun_configure
****************************************************************************/
static int ipfwd_tun_configure(FAR struct ipfwd_tun_s *tun)
{
struct ifreq ifr;
int errcode;
int ret;
tun->it_fd = open("/dev/tun", O_RDWR);
if (tun->it_fd < 0)
{
errcode = errno;
fprintf(stderr, "ERROR: Failed to open /dev/tun: %d\n", errcode);
return -errcode;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN;
ret = ioctl(tun->it_fd, TUNSETIFF, (unsigned long)&ifr);
if (ret < 0)
{
errcode = errno;
fprintf(stderr, "ERROR: ioctl TUNSETIFF failed: %d\n", errcode);
close(tun->it_fd);
return -errcode;
}
strncpy(tun->it_devname, ifr.ifr_name, MAX_DEVNAME);
printf("Created TUN device: %s\n", tun->it_devname);
return 0;
}
/****************************************************************************
* Name: ipfwd_netconfig
****************************************************************************/
static int ipfwd_netconfig(FAR struct ipfwd_tun_s *tun, IPADDR_TYPE ipaddr,
IPADDR_TYPE netmask)
{
int ret;
#ifdef CONFIG_NET_IPv6
struct in6_addr addr;
memcpy(addr.s6_addr16, ipaddr, 8 * sizeof(uint16_t));
ret = netlib_set_ipv6addr(tun->it_devname, &addr);
if (ret < 0)
{
fprintf(stderr, "ERROR: netlib_set_ipv6addr() failed\n", ret);
return ret;
}
memcpy(addr.s6_addr16, netmask, 8 * sizeof(uint16_t));
ret = netlib_set_ipv6netmask(tun->it_devname, &addr);
if (ret < 0)
{
fprintf(stderr, "ERROR: netlib_set_ipv6netmask() failed\n", ret);
return ret;
}
#else /* CONFIG_NET_IPv4 */
struct in_addr addr;
addr.s_addr = ipaddr;
ret = netlib_set_ipv4addr(tun->it_devname, &addr);
if (ret < 0)
{
fprintf(stderr, "ERROR: netlib_set_ipv4addr() failed\n", ret);
return ret;
}
addr.s_addr = netmask;
ret = netlib_set_ipv4netmask(tun->it_devname, &addr);
if (ret < 0)
{
fprintf(stderr, "ERROR: netlib_set_ipv4netmask() failed\n", ret);
return ret;
}
#endif
netlib_ifup(tun->it_devname);
return 0;
}
/****************************************************************************
* Name: ipfwd_receiver
****************************************************************************/
/****************************************************************************
* Name: ipfwd_sender
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: fstest_main
****************************************************************************/
#ifdef CONFIG_BUILD_KERNEL
int main(int argc, FAR char *argv[])
#else
int ipfwd_main(int argc, char *argv[])
#endif
{
struct ipfwd_state_s fwd;
int errcode = EXIT_SUCCESS;
int ret;
/* Initialize the first TUN device */
ret = ipfwd_tun_configure(&fwd.if_tun0);
if (ret < 0)
{
fprintf(stderr, "ERROR: Failed to create tun0: %d\n", ret);
goto errout;
}
ret = ipfwd_netconfig(&fwd.if_tun0, g_tun0_ipaddr, g_netmask);
if (ret < 0)
{
fprintf(stderr, "ERROR: ipfwd_netconfig failed: %d\n", ret);
goto errout_with_tun0;
}
/* Initialize the second TUN device */
ret = ipfwd_tun_configure(&fwd.if_tun1);
if (ret < 0)
{
fprintf(stderr, "ERROR: Failed to create tun1: %d\n", ret);
goto errout_with_tun0;
}
ret = ipfwd_netconfig(&fwd.if_tun0, g_tun0_ipaddr, g_netmask);
if (ret < 0)
{
fprintf(stderr, "ERROR: ipfwd_netconfig failed: %d\n", ret);
errcode = EXIT_FAILURE;
goto errout_with_tun1;
}
/* Start receiver thread */
/* Start sender thread */
/* Wait for sender thread to terminate */
errout_with_receiver:
/* Wait for receiver thread to terminate */
errout_with_tun1:
close(fwd.if_tun1.it_fd);
errout_with_tun0:
close(fwd.if_tun0.it_fd);
errout:
return errcode;
}