411 lines
9.0 KiB
C
411 lines
9.0 KiB
C
/*
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* Ioctl handler
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*
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* $Id: br_ioctl.c,v 1.4 2000/11/08 05:16:40 davem Exp $
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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
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/if_bridge.h>
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#include <linux/netdevice.h>
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#include <linux/times.h>
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#include <asm/uaccess.h>
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#include "br_private.h"
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/* called with RTNL */
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static int get_bridge_ifindices(int *indices, int num)
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{
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struct net_device *dev;
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int i = 0;
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for (dev = dev_base; dev && i < num; dev = dev->next) {
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if (dev->priv_flags & IFF_EBRIDGE)
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indices[i++] = dev->ifindex;
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}
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return i;
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}
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/* called with RTNL */
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static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
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{
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struct net_bridge_port *p;
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list_for_each_entry(p, &br->port_list, list) {
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if (p->port_no < num)
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ifindices[p->port_no] = p->dev->ifindex;
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}
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}
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/*
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* Format up to a page worth of forwarding table entries
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* userbuf -- where to copy result
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* maxnum -- maximum number of entries desired
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* (limited to a page for sanity)
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* offset -- number of records to skip
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*/
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static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
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unsigned long maxnum, unsigned long offset)
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{
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int num;
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void *buf;
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size_t size = maxnum * sizeof(struct __fdb_entry);
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if (size > PAGE_SIZE) {
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size = PAGE_SIZE;
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maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
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}
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buf = kmalloc(size, GFP_USER);
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if (!buf)
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return -ENOMEM;
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num = br_fdb_fillbuf(br, buf, maxnum, offset);
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if (num > 0) {
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if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
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num = -EFAULT;
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}
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kfree(buf);
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return num;
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}
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static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
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{
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struct net_device *dev;
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int ret;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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dev = dev_get_by_index(ifindex);
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if (dev == NULL)
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return -EINVAL;
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if (isadd)
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ret = br_add_if(br, dev);
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else
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ret = br_del_if(br, dev);
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dev_put(dev);
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return ret;
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}
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/*
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* Legacy ioctl's through SIOCDEVPRIVATE
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* This interface is deprecated because it was too difficult to
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* to do the translation for 32/64bit ioctl compatability.
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*/
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static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
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{
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struct net_bridge *br = netdev_priv(dev);
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unsigned long args[4];
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if (copy_from_user(args, rq->ifr_data, sizeof(args)))
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return -EFAULT;
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switch (args[0]) {
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case BRCTL_ADD_IF:
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case BRCTL_DEL_IF:
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return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
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case BRCTL_GET_BRIDGE_INFO:
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{
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struct __bridge_info b;
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memset(&b, 0, sizeof(struct __bridge_info));
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rcu_read_lock();
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memcpy(&b.designated_root, &br->designated_root, 8);
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memcpy(&b.bridge_id, &br->bridge_id, 8);
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b.root_path_cost = br->root_path_cost;
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b.max_age = jiffies_to_clock_t(br->max_age);
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b.hello_time = jiffies_to_clock_t(br->hello_time);
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b.forward_delay = br->forward_delay;
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b.bridge_max_age = br->bridge_max_age;
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b.bridge_hello_time = br->bridge_hello_time;
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b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
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b.topology_change = br->topology_change;
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b.topology_change_detected = br->topology_change_detected;
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b.root_port = br->root_port;
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b.stp_enabled = br->stp_enabled;
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b.ageing_time = jiffies_to_clock_t(br->ageing_time);
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b.hello_timer_value = br_timer_value(&br->hello_timer);
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b.tcn_timer_value = br_timer_value(&br->tcn_timer);
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b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
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b.gc_timer_value = br_timer_value(&br->gc_timer);
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rcu_read_unlock();
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if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
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return -EFAULT;
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return 0;
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}
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case BRCTL_GET_PORT_LIST:
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{
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int num, *indices;
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num = args[2];
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if (num < 0)
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return -EINVAL;
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if (num == 0)
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num = 256;
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if (num > BR_MAX_PORTS)
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num = BR_MAX_PORTS;
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indices = kmalloc(num*sizeof(int), GFP_KERNEL);
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if (indices == NULL)
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return -ENOMEM;
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memset(indices, 0, num*sizeof(int));
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get_port_ifindices(br, indices, num);
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if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
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num = -EFAULT;
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kfree(indices);
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return num;
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}
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case BRCTL_SET_BRIDGE_FORWARD_DELAY:
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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spin_lock_bh(&br->lock);
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br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
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if (br_is_root_bridge(br))
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br->forward_delay = br->bridge_forward_delay;
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spin_unlock_bh(&br->lock);
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return 0;
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case BRCTL_SET_BRIDGE_HELLO_TIME:
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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spin_lock_bh(&br->lock);
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br->bridge_hello_time = clock_t_to_jiffies(args[1]);
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if (br_is_root_bridge(br))
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br->hello_time = br->bridge_hello_time;
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spin_unlock_bh(&br->lock);
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return 0;
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case BRCTL_SET_BRIDGE_MAX_AGE:
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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spin_lock_bh(&br->lock);
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br->bridge_max_age = clock_t_to_jiffies(args[1]);
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if (br_is_root_bridge(br))
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br->max_age = br->bridge_max_age;
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spin_unlock_bh(&br->lock);
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return 0;
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case BRCTL_SET_AGEING_TIME:
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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br->ageing_time = clock_t_to_jiffies(args[1]);
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return 0;
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case BRCTL_GET_PORT_INFO:
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{
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struct __port_info p;
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struct net_bridge_port *pt;
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rcu_read_lock();
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if ((pt = br_get_port(br, args[2])) == NULL) {
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rcu_read_unlock();
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return -EINVAL;
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}
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memset(&p, 0, sizeof(struct __port_info));
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memcpy(&p.designated_root, &pt->designated_root, 8);
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memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
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p.port_id = pt->port_id;
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p.designated_port = pt->designated_port;
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p.path_cost = pt->path_cost;
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p.designated_cost = pt->designated_cost;
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p.state = pt->state;
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p.top_change_ack = pt->topology_change_ack;
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p.config_pending = pt->config_pending;
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p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
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p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
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p.hold_timer_value = br_timer_value(&pt->hold_timer);
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rcu_read_unlock();
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if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
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return -EFAULT;
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return 0;
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}
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case BRCTL_SET_BRIDGE_STP_STATE:
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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br->stp_enabled = args[1]?1:0;
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return 0;
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case BRCTL_SET_BRIDGE_PRIORITY:
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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spin_lock_bh(&br->lock);
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br_stp_set_bridge_priority(br, args[1]);
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spin_unlock_bh(&br->lock);
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return 0;
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case BRCTL_SET_PORT_PRIORITY:
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{
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struct net_bridge_port *p;
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int ret = 0;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (args[2] >= (1<<(16-BR_PORT_BITS)))
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return -ERANGE;
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spin_lock_bh(&br->lock);
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if ((p = br_get_port(br, args[1])) == NULL)
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ret = -EINVAL;
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else
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br_stp_set_port_priority(p, args[2]);
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spin_unlock_bh(&br->lock);
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return ret;
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}
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case BRCTL_SET_PATH_COST:
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{
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struct net_bridge_port *p;
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int ret = 0;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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spin_lock_bh(&br->lock);
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if ((p = br_get_port(br, args[1])) == NULL)
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ret = -EINVAL;
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else
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br_stp_set_path_cost(p, args[2]);
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spin_unlock_bh(&br->lock);
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return ret;
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}
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case BRCTL_GET_FDB_ENTRIES:
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return get_fdb_entries(br, (void __user *)args[1],
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args[2], args[3]);
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}
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return -EOPNOTSUPP;
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}
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static int old_deviceless(void __user *uarg)
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{
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unsigned long args[3];
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if (copy_from_user(args, uarg, sizeof(args)))
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return -EFAULT;
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switch (args[0]) {
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case BRCTL_GET_VERSION:
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return BRCTL_VERSION;
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case BRCTL_GET_BRIDGES:
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{
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int *indices;
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int ret = 0;
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if (args[2] >= 2048)
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return -ENOMEM;
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indices = kmalloc(args[2]*sizeof(int), GFP_KERNEL);
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if (indices == NULL)
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return -ENOMEM;
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memset(indices, 0, args[2]*sizeof(int));
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args[2] = get_bridge_ifindices(indices, args[2]);
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ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
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? -EFAULT : args[2];
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kfree(indices);
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return ret;
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}
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case BRCTL_ADD_BRIDGE:
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case BRCTL_DEL_BRIDGE:
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{
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char buf[IFNAMSIZ];
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
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return -EFAULT;
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buf[IFNAMSIZ-1] = 0;
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if (args[0] == BRCTL_ADD_BRIDGE)
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return br_add_bridge(buf);
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return br_del_bridge(buf);
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}
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}
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return -EOPNOTSUPP;
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}
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int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
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{
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switch (cmd) {
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case SIOCGIFBR:
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case SIOCSIFBR:
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return old_deviceless(uarg);
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case SIOCBRADDBR:
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case SIOCBRDELBR:
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{
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char buf[IFNAMSIZ];
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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if (copy_from_user(buf, uarg, IFNAMSIZ))
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return -EFAULT;
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buf[IFNAMSIZ-1] = 0;
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if (cmd == SIOCBRADDBR)
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return br_add_bridge(buf);
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return br_del_bridge(buf);
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}
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}
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return -EOPNOTSUPP;
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}
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int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
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{
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struct net_bridge *br = netdev_priv(dev);
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switch(cmd) {
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case SIOCDEVPRIVATE:
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return old_dev_ioctl(dev, rq, cmd);
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case SIOCBRADDIF:
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case SIOCBRDELIF:
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return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
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}
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pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
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return -EOPNOTSUPP;
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}
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