mirror of https://github.com/hak5/openwrt.git
add trelay, a trivial ethernet relay which allows pseudo-bridging ad-hoc or client mode devices over vlans to other hosts
SVN-Revision: 31122lede-17.01
Felix Fietkau
parent
15757646c5
commit
c3bba7f8c6
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@ -0,0 +1,51 @@
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#
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# Copyright (C) 2012 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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include $(INCLUDE_DIR)/kernel.mk
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PKG_NAME:=trelay
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PKG_VERSION:=0.1
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk
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define KernelPackage/trelay
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SUBMENU:=Network Support
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TITLE:=Trivial Ethernet Relay
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DEPENDS:=@!LINUX_2_6_30 @!LINUX_2_6_31 @!LINUX_2_6_32
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FILES:=$(PKG_BUILD_DIR)/trelay.ko
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AUTOLOAD:=$(call AutoLoad,50,trelay)
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endef
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define KernelPackage/trelay/description
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trelay relays ethernet packets between two devices (similar to a bridge), but
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without any MAC address checks. This makes it possible to bridge client mode
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or ad-hoc mode wifi devices to ethernet VLANs, assuming the remote end uses
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the same source MAC address as the device that packets are supposed to exit
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from.
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endef
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include $(INCLUDE_DIR)/kernel-defaults.mk
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define Build/Prepare
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mkdir -p $(PKG_BUILD_DIR)
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cp src/Makefile src/trelay.c $(PKG_BUILD_DIR)/
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endef
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define Build/Compile
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$(MAKE) $(KERNEL_MAKEOPTS) SUBDIRS="$(PKG_BUILD_DIR)" modules
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endef
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define KernelPackage/trelay/install
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$(INSTALL_DIR) $(1)/etc/hotplug.d/net $(1)/etc/init.d $(1)/etc/config
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$(INSTALL_DATA) ./files/trelay.hotplug $(1)/etc/hotplug.d/net/50-trelay
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$(INSTALL_BIN) ./files/trelay.init $(1)/etc/init.d/trelay
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$(INSTALL_DATA) ./files/trelay.config $(1)/etc/config/trelay
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endef
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$(eval $(call KernelPackage,trelay))
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@ -0,0 +1,4 @@
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config trelay
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option enabled 0
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option dev1 eth0
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option dev2 wlan0
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@ -0,0 +1,5 @@
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case "$ACTION" in
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add|register)
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[ -f /var/run/trelay.active ] && /etc/init.d/trelay start
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;;
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esac
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@ -0,0 +1,32 @@
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#!/bin/sh /etc/rc.common
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START=80
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check_relay() {
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local cfg="$1"
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config_get_bool enabled "$cfg" enabled 1
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[ "$enabled" -gt 0 ] || return
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config_get dev1 "$cfg" dev1
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config_get dev2 "$cfg" dev2
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[ -d "/sys/kernel/debug/trelay/${dev1}-${dev2}" ] && return
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[ -d "/sys/class/net/${dev1}" -a -d "/sys/class/net/${dev2}" ] || return
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ifconfig "$dev1" up
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ifconfig "$dev2" up
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echo "${dev1}-${dev2},${dev1},${dev2}" > /sys/kernel/debug/trelay/add
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}
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start() {
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config_load trelay
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config_foreach check_relay trelay
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touch /var/run/trelay.active
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}
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stop() {
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rm -f /var/run/trelay.active
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for relay in /sys/kernel/debug/trelay/*; do
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[ -d "$relay" ] && echo > "$relay/remove"
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done
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}
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@ -0,0 +1 @@
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obj-m := trelay.o
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@ -0,0 +1,272 @@
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/*
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* trelay.c: Trivial Ethernet Relay
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*
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* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/debugfs.h>
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static LIST_HEAD(trelay_devs);
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static struct dentry *debugfs_dir;
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struct trelay {
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struct list_head list;
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struct net_device *dev1, *dev2;
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struct dentry *debugfs;
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char name[];
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};
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rx_handler_result_t trelay_handle_frame(struct sk_buff **pskb)
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{
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struct net_device *dev;
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struct sk_buff *skb = *pskb;
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dev = rcu_dereference(skb->dev->rx_handler_data);
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if (!dev)
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return RX_HANDLER_PASS;
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if (skb->protocol == htons(ETH_P_PAE))
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return RX_HANDLER_PASS;
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skb_push(skb, ETH_HLEN);
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skb->dev = dev;
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skb_forward_csum(skb);
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dev_queue_xmit(skb);
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return RX_HANDLER_CONSUMED;
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}
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static int trelay_open(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return 0;
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}
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static int trelay_do_remove(struct trelay *tr)
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{
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list_del(&tr->list);
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dev_put(tr->dev1);
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dev_put(tr->dev2);
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netdev_rx_handler_unregister(tr->dev1);
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netdev_rx_handler_unregister(tr->dev2);
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debugfs_remove_recursive(tr->debugfs);
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kfree(tr);
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return 0;
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}
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static struct trelay *trelay_find(struct net_device *dev)
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{
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struct trelay *tr;
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list_for_each_entry(tr, &trelay_devs, list) {
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if (tr->dev1 == dev || tr->dev2 == dev)
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return tr;
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}
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return NULL;
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}
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static int tr_device_event(struct notifier_block *unused, unsigned long event,
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void *ptr)
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{
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struct net_device *dev = ptr;
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struct trelay *tr;
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if (event != NETDEV_UNREGISTER)
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goto out;
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tr = trelay_find(dev);
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if (!tr)
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goto out;
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trelay_do_remove(tr);
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out:
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return NOTIFY_DONE;
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}
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static ssize_t trelay_remove_write(struct file *file, const char __user *ubuf,
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size_t count, loff_t *ppos)
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{
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struct trelay *tr = file->private_data;
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int ret;
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rtnl_lock();
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ret = trelay_do_remove(tr);
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rtnl_unlock();
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if (ret < 0)
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return ret;
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return count;
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}
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static const struct file_operations fops_remove = {
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.owner = THIS_MODULE,
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.open = trelay_open,
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.write = trelay_remove_write,
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.llseek = default_llseek,
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};
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static int trelay_do_add(char *name, char *devn1, char *devn2)
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{
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struct net_device *dev1, *dev2;
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struct trelay *tr, *tr1;
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int ret;
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tr = kzalloc(sizeof(*tr) + strlen(name) + 1, GFP_KERNEL);
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if (!tr)
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return -ENOMEM;
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rtnl_lock();
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rcu_read_lock();
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ret = -EEXIST;
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list_for_each_entry(tr1, &trelay_devs, list) {
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if (!strcmp(tr1->name, name))
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goto out;
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}
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ret = -ENOENT;
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dev1 = dev_get_by_name_rcu(&init_net, devn1);
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dev2 = dev_get_by_name_rcu(&init_net, devn2);
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if (!dev1 || !dev2)
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goto out;
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ret = netdev_rx_handler_register(dev1, trelay_handle_frame, dev2);
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if (ret < 0)
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goto out;
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ret = netdev_rx_handler_register(dev2, trelay_handle_frame, dev1);
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if (ret < 0) {
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netdev_rx_handler_unregister(dev1);
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goto out;
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}
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dev_hold(dev1);
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dev_hold(dev2);
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strcpy(tr->name, name);
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tr->dev1 = dev1;
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tr->dev2 = dev2;
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list_add_tail(&tr->list, &trelay_devs);
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tr->debugfs = debugfs_create_dir(name, debugfs_dir);
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debugfs_create_file("remove", S_IWUSR, tr->debugfs, tr, &fops_remove);
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ret = 0;
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out:
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rcu_read_unlock();
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rtnl_unlock();
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if (ret < 0)
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kfree(tr);
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return ret;
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}
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static ssize_t trelay_add_write(struct file *file, const char __user *ubuf,
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size_t count, loff_t *ppos)
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{
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char buf[256];
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char *dev1, *dev2, *tmp;
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ssize_t len, ret;
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len = min(count, sizeof(buf) - 1);
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if (copy_from_user(buf, ubuf, len))
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return -EFAULT;
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buf[len] = 0;
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if ((tmp = strchr(buf, '\n')))
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*tmp = 0;
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dev1 = strchr(buf, ',');
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if (!dev1)
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return -EINVAL;
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*(dev1++) = 0;
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dev2 = strchr(dev1, ',');
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if (!dev2)
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return -EINVAL;
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*(dev2++) = 0;
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if (strchr(dev2, ','))
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return -EINVAL;
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if (!strlen(buf) || !strlen(dev1) || !strlen(dev2))
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return -EINVAL;
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ret = trelay_do_add(buf, dev1, dev2);
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if (ret < 0)
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return ret;
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return count;
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}
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static const struct file_operations fops_add = {
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.owner = THIS_MODULE,
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.write = trelay_add_write,
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.llseek = default_llseek,
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};
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static struct notifier_block tr_dev_notifier = {
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.notifier_call = tr_device_event
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};
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static int __init trelay_init(void)
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{
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int ret;
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debugfs_dir = debugfs_create_dir("trelay", NULL);
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if (!debugfs_dir)
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return -ENOMEM;
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debugfs_create_file("add", S_IWUSR, debugfs_dir, NULL, &fops_add);
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ret = register_netdevice_notifier(&tr_dev_notifier);
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if (ret < 0)
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goto error;
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return 0;
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error:
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debugfs_remove_recursive(debugfs_dir);
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return ret;
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}
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static void __exit trelay_exit(void)
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{
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struct trelay *tr, *tmp;
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unregister_netdevice_notifier(&tr_dev_notifier);
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rtnl_lock();
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list_for_each_entry_safe(tr, tmp, &trelay_devs, list)
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trelay_do_remove(tr);
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rtnl_unlock();
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debugfs_remove_recursive(debugfs_dir);
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}
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module_init(trelay_init);
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module_exit(trelay_exit);
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MODULE_LICENSE("GPL");
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