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![Denis Cheng](/assets/img/avatar_default.png)
single list_head variable initialized with LIST_HEAD_INIT could almost always can be replaced with LIST_HEAD declaration, this shrinks the code and looks better. Signed-off-by: Denis Cheng <crquan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
223 lines
4.8 KiB
C
223 lines
4.8 KiB
C
/*
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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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* This module:
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* This module 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
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* 2 of the License, or (at your option) any later version.
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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 <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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atomic_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 defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
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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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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 < 0 || 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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