From fcc2e6c829f1ddbfc745addf4ac4b7ca84ba72db Mon Sep 17 00:00:00 2001 From: Eugene Snider Date: Tue, 5 May 2015 11:31:12 -0700 Subject: Add l2 fwd kernel module This commit adds a simple kernel module for l2 forwarding or termination This module provides only level 2 forwarding between two ports, it does not do any NAT or Masquerade. Arguments are: net1=ethXXXX # set forwarding port 1 net2=ethXXX # set forwarding port 2 terminate=1 # terminate the connection and free the skb Changed to GPL licensing to avoid compilation issues Added sanity build target Fix whitespace issues JIRA: VSPERF-39 Change-Id: I0fa3e0135af06b7cba665a357dccfb9459edb9f6 Signed-off-by: Eugene Snider --- src/Makefile | 1 + src/README | 1 + src/l2fwd/LICENSE.txt | 339 ++++++++++++++++++++++++++++++++++++++++ src/l2fwd/Makefile | 43 +++++ src/l2fwd/gen_debian_package.sh | 72 +++++++++ src/l2fwd/l2fwd.c | 167 ++++++++++++++++++++ 6 files changed, 623 insertions(+) create mode 100644 src/l2fwd/LICENSE.txt create mode 100644 src/l2fwd/Makefile create mode 100755 src/l2fwd/gen_debian_package.sh create mode 100644 src/l2fwd/l2fwd.c (limited to 'src') diff --git a/src/Makefile b/src/Makefile index 5326e468..3b7104ad 100644 --- a/src/Makefile +++ b/src/Makefile @@ -23,6 +23,7 @@ include mk/master.mk # specify upstream package as SUBDIRS - common terms as suggest by gnu-make SUBDIRS = +SUBDIRS += l2fwd SUBDIRS += dpdk SUBDIRS += ovs diff --git a/src/README b/src/README index ff1a1b8e..0492fa1d 100644 --- a/src/README +++ b/src/README @@ -26,3 +26,4 @@ So this whole folder can be ignored. * mk: contains top level makefiles * dpdk: place holder for dpdk package * ovs: place holder for ovs package. +* l2fwd: simple l2 forwarding kernel module diff --git a/src/l2fwd/LICENSE.txt b/src/l2fwd/LICENSE.txt new file mode 100644 index 00000000..d159169d --- /dev/null +++ b/src/l2fwd/LICENSE.txt @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/src/l2fwd/Makefile b/src/l2fwd/Makefile new file mode 100644 index 00000000..21fbe5bb --- /dev/null +++ b/src/l2fwd/Makefile @@ -0,0 +1,43 @@ +# Copyright 2015 Futurewei Inc. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# A copy of the license is included with this distribution. If you did not +# recieve a copy you may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +obj-m += l2fwd.o + +KBUILD_CFLAGS += -Wno-unused-function -Wno-unused-label -Wno-unused-variable +# Allow kernel version to be overridden by environment +KERNEL_VERSION ?= $(shell uname -r) + +KERNELDIR := /lib/modules/$(KERNEL_VERSION)/build +PWD := $(shell pwd) + +all: + $(MAKE) -C $(KERNELDIR) M=$(PWD) modules + +sanity: + echo "Done" + +clean: + $(MAKE) -C $(KERNELDIR) M=$(PWD) clean + rm -f l2fwd*deb + +install: + sudo mkdir /lib/modules/`uname -r`/kernel/net/core + sudo cp *.ko /lib/modules/`uname -r`/kernel/net/core + +uninstall: + sudo rm /lib/modules/`uname -r`/kernel/net/core/l2fwd.ko + +debian-package: all + ./gen_debian_package.sh diff --git a/src/l2fwd/gen_debian_package.sh b/src/l2fwd/gen_debian_package.sh new file mode 100755 index 00000000..88829ce6 --- /dev/null +++ b/src/l2fwd/gen_debian_package.sh @@ -0,0 +1,72 @@ +#!/bin/bash +# Copyright 2015 Futurewei Inc. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# A copy of the license is included with this distribution. If you did not +# recieve a copy you may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +which dpkg-architecture 2>&1 1>/dev/null +if [ $? -ne 0 ]; then + echo "Can't locate dpkg-architecture" + echo "try 'sudo apt-get install dpkg-dev" + exit 1 +fi +KERNEL_VERSION=${KERNEL_VERSION-`uname -r`} +PACKAGE_NAME=l2fwd +PACKAGE_ARCH=`dpkg-architecture -qDEB_BUILD_ARCH` +GIT_VERSION=`git ls-remote 2>/dev/null | awk '{print $2}' | sed 's/\// /g' | sort -n -k4| awk '/[0-9]+/{print $(NF-1)"-"$NF}' | tail -n -1` +PACKAGE_VERSION="1.0.$GIT_VERSION-${KERNEL_VERSION}" + +MODULE_NAME=l2fwd +PACKAGE_DEPENDS=linux-image-${KERNEL_VERSION} + +rm -rf ${PACKAGE_NAME}-${PACKAGE_VERSION} +mkdir -p ${PACKAGE_NAME}-${PACKAGE_VERSION}/DEBIAN +# put this in with pktgen +mkdir -p ${PACKAGE_NAME}-${PACKAGE_VERSION}/lib/modules/${KERNEL_VERSION}/kernel/net/core/ +cat >>${PACKAGE_NAME}-${PACKAGE_VERSION}/DEBIAN/control <>${PACKAGE_NAME}-${PACKAGE_VERSION}/DEBIAN/preinst <>${PACKAGE_NAME}-${PACKAGE_VERSION}/DEBIAN/postinst <>${PACKAGE_NAME}-${PACKAGE_VERSION}/DEBIAN/postrm < +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static char *net1 = "eth1"; +module_param(net1, charp, 0); +MODULE_PARM_DESC(net1, "The first net device name (default is eth1)"); + +static char *net2 = "eth2"; +module_param(net2, charp, 0); +MODULE_PARM_DESC(net2, "The second net device name (default is eth2)"); + +static bool print = false; +module_param(print, bool, 0); +MODULE_PARM_DESC(print, "Log forwarding statistics (default is false)"); + +static int stats_interval = 10000; +module_param(stats_interval, int, 0); +MODULE_PARM_DESC(print, "Forwarding statistics packet interval (default is 10000)"); + +static bool terminate = false; +module_param(terminate, bool, 0); +MODULE_PARM_DESC(terminate, "Free skb instead of forwarding"); + +static struct net_device *dev1, *dev2; +int count; + +static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb) +{ + struct sk_buff *skb = *pskb; + struct net_device *dev; + + if (unlikely(skb->pkt_type == PACKET_LOOPBACK)) + return RX_HANDLER_PASS; + + dev = (struct net_device*) rcu_dereference_rtnl(skb->dev->rx_handler_data); + count++; + if ( ((count % stats_interval) == 0) && print ) + printk("l2fwd count %d\n", count); + + if (terminate) + { + kfree_skb(skb); + } + else + { + skb->dev = dev; + skb_push(skb, ETH_HLEN); + dev_queue_xmit(skb); + } + + return RX_HANDLER_CONSUMED; +} + +static int __init l2fwd_init_module(void) +{ + int err = -1; + + dev1 = dev_get_by_name(&init_net, net1); + if (!dev1) + { + printk("can't get device %s\n", net1); + err = -ENODEV; + goto out; + } + + dev2 = dev_get_by_name(&init_net, net2); + if (!dev2) + { + printk("can't get device %s\n", net2); + err = -ENODEV; + goto out_dev1; + } + + rtnl_lock(); + err = netdev_rx_handler_register(dev1, netdev_frame_hook, dev2); + if (err) + { + printk("can't register rx_handler for device %s\n", net1); + goto out_dev2; + } + dev_set_promiscuity(dev1, 1); + + err = netdev_rx_handler_register(dev2, netdev_frame_hook, dev1); + if (err) + { + printk("can't register rx_handler for device %s\n", net2); + netdev_rx_handler_unregister(dev1); + goto out_dev2; + } + dev_set_promiscuity(dev2, 1); + + rtnl_unlock(); + return 0; + +out_dev2: + rtnl_unlock(); + dev_put(dev2); + dev2 = NULL; +out_dev1: + dev_put(dev1); + dev1 = NULL; +out: + return err; +} + +static void __exit l2fwd_exit_module(void) +{ + rtnl_lock(); + if (dev2) + { + dev_put(dev2); + netdev_rx_handler_unregister(dev1); + } + if (dev1) + { + dev_put(dev1); + netdev_rx_handler_unregister(dev2); + } + dev_set_promiscuity(dev1, -1); + dev_set_promiscuity(dev2, -1); + rtnl_unlock(); +} + +module_init(l2fwd_init_module); +module_exit(l2fwd_exit_module); + +MODULE_DESCRIPTION("Huawei L2 Forwarding module"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("0.1"); -- cgit 1.2.3-korg