![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this module is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 18 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520170858.008906948@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
222 lines
4.5 KiB
C
222 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* X.25 Packet Layer release 002
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*
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* This is ALPHA test software. This code may break your machine,
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* randomly fail to work with new releases, misbehave and/or generally
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* screw up. It might even work.
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*
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* This code REQUIRES 2.1.15 or higher
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*
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* History
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* X.25 001 Jonathan Naylor Started coding.
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*/
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#include <linux/if_arp.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <net/x25.h>
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LIST_HEAD(x25_route_list);
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DEFINE_RWLOCK(x25_route_list_lock);
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/*
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* Add a new route.
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*/
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static int x25_add_route(struct x25_address *address, unsigned int sigdigits,
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struct net_device *dev)
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{
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struct x25_route *rt;
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struct list_head *entry;
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int rc = -EINVAL;
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write_lock_bh(&x25_route_list_lock);
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list_for_each(entry, &x25_route_list) {
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rt = list_entry(entry, struct x25_route, node);
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if (!memcmp(&rt->address, address, sigdigits) &&
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rt->sigdigits == sigdigits)
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goto out;
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}
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rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
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rc = -ENOMEM;
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if (!rt)
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goto out;
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strcpy(rt->address.x25_addr, "000000000000000");
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memcpy(rt->address.x25_addr, address->x25_addr, sigdigits);
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rt->sigdigits = sigdigits;
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rt->dev = dev;
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refcount_set(&rt->refcnt, 1);
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list_add(&rt->node, &x25_route_list);
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rc = 0;
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out:
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write_unlock_bh(&x25_route_list_lock);
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return rc;
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}
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/**
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* __x25_remove_route - remove route from x25_route_list
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* @rt: route to remove
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*
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* Remove route from x25_route_list. If it was there.
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* Caller must hold x25_route_list_lock.
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*/
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static void __x25_remove_route(struct x25_route *rt)
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{
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if (rt->node.next) {
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list_del(&rt->node);
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x25_route_put(rt);
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}
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}
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static int x25_del_route(struct x25_address *address, unsigned int sigdigits,
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struct net_device *dev)
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{
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struct x25_route *rt;
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struct list_head *entry;
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int rc = -EINVAL;
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write_lock_bh(&x25_route_list_lock);
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list_for_each(entry, &x25_route_list) {
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rt = list_entry(entry, struct x25_route, node);
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if (!memcmp(&rt->address, address, sigdigits) &&
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rt->sigdigits == sigdigits && rt->dev == dev) {
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__x25_remove_route(rt);
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rc = 0;
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break;
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}
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}
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write_unlock_bh(&x25_route_list_lock);
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return rc;
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}
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/*
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* A device has been removed, remove its routes.
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*/
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void x25_route_device_down(struct net_device *dev)
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{
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struct x25_route *rt;
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struct list_head *entry, *tmp;
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write_lock_bh(&x25_route_list_lock);
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list_for_each_safe(entry, tmp, &x25_route_list) {
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rt = list_entry(entry, struct x25_route, node);
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if (rt->dev == dev)
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__x25_remove_route(rt);
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}
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write_unlock_bh(&x25_route_list_lock);
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/* Remove any related forwarding */
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x25_clear_forward_by_dev(dev);
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}
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/*
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* Check that the device given is a valid X.25 interface that is "up".
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*/
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struct net_device *x25_dev_get(char *devname)
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{
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struct net_device *dev = dev_get_by_name(&init_net, devname);
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if (dev &&
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(!(dev->flags & IFF_UP) || (dev->type != ARPHRD_X25
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#if IS_ENABLED(CONFIG_LLC)
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&& dev->type != ARPHRD_ETHER
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#endif
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))){
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dev_put(dev);
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dev = NULL;
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}
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return dev;
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}
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/**
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* x25_get_route - Find a route given an X.25 address.
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* @addr - address to find a route for
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*
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* Find a route given an X.25 address.
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*/
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struct x25_route *x25_get_route(struct x25_address *addr)
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{
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struct x25_route *rt, *use = NULL;
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struct list_head *entry;
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read_lock_bh(&x25_route_list_lock);
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list_for_each(entry, &x25_route_list) {
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rt = list_entry(entry, struct x25_route, node);
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if (!memcmp(&rt->address, addr, rt->sigdigits)) {
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if (!use)
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use = rt;
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else if (rt->sigdigits > use->sigdigits)
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use = rt;
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}
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}
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if (use)
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x25_route_hold(use);
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read_unlock_bh(&x25_route_list_lock);
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return use;
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}
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/*
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* Handle the ioctls that control the routing functions.
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*/
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int x25_route_ioctl(unsigned int cmd, void __user *arg)
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{
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struct x25_route_struct rt;
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struct net_device *dev;
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int rc = -EINVAL;
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if (cmd != SIOCADDRT && cmd != SIOCDELRT)
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goto out;
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rc = -EFAULT;
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if (copy_from_user(&rt, arg, sizeof(rt)))
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goto out;
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rc = -EINVAL;
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if (rt.sigdigits > 15)
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goto out;
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dev = x25_dev_get(rt.device);
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if (!dev)
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goto out;
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if (cmd == SIOCADDRT)
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rc = x25_add_route(&rt.address, rt.sigdigits, dev);
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else
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rc = x25_del_route(&rt.address, rt.sigdigits, dev);
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dev_put(dev);
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out:
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return rc;
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}
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/*
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* Release all memory associated with X.25 routing structures.
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*/
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void __exit x25_route_free(void)
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{
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struct x25_route *rt;
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struct list_head *entry, *tmp;
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write_lock_bh(&x25_route_list_lock);
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list_for_each_safe(entry, tmp, &x25_route_list) {
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rt = list_entry(entry, struct x25_route, node);
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__x25_remove_route(rt);
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}
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write_unlock_bh(&x25_route_list_lock);
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}
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