add trelay, a trivial ethernet relay which allows pseudo-bridging ad-hoc or client mode devices over vlans to other hosts
SVN-Revision: 31122master
parent
15757646c5
commit
c3bba7f8c6
@ -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 $(call KernelPackage,trelay)) |
@ -0,0 +1,4 @@ |
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config trelay |
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option enabled 0 |
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option dev1 eth0 |
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option dev2 wlan0 |
@ -0,0 +1,5 @@ |
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case "$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 |
@ -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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} |
@ -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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