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Kernel/net/bridge/br_ioctl.c

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/*
* Ioctl handler
* Linux ethernet bridge
*
* Authors:
* Lennert Buytenhek <buytenh@gnu.org>
*
* This program 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.
*/
#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/if_bridge.h>
#include <linux/netdevice.h>
#include <linux/times.h>
#include <net/net_namespace.h>
#include <asm/uaccess.h>
#include "br_private.h"
#if defined(CONFIG_MIPS_BRCM) && defined(CONFIG_BR_IGMP_SNOOP)
#include "br_igmp.h"
#endif // defined(CONFIG_MIPS_BRCM) && defined(CONFIG_BR_IGMP_SNOOP)
#if defined(CONFIG_MIPS_BRCM) && defined(CONFIG_BR_MLD_SNOOP)
#include "br_mld.h"
#endif //defined(CONFIG_MIPS_BRCM) && defined(CONFIG_BR_MLD_SNOOP)
#if defined(CONFIG_MIPS_BRCM)
#include "br_fdb.h"
#include "br_flows.h"
#endif
#if defined(CONFIG_MIPS_BRCM)
#include <linux/bcm_log.h>
#if defined(CONFIG_BCM96828) && !defined(CONFIG_EPON_HGU)
extern int uni_uni_enabled;
#endif
#endif
/* called with RTNL */
static int get_bridge_ifindices(struct net *net, int *indices, int num)
{
struct net_device *dev;
int i = 0;
for_each_netdev(net, dev) {
if (i >= num)
break;
if (dev->priv_flags & IFF_EBRIDGE)
indices[i++] = dev->ifindex;
}
return i;
}
/* called with RTNL */
static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
{
struct net_bridge_port *p;
list_for_each_entry(p, &br->port_list, list) {
if (p->port_no < num)
ifindices[p->port_no] = p->dev->ifindex;
}
}
/*
* Format up to a page worth of forwarding table entries
* userbuf -- where to copy result
* maxnum -- maximum number of entries desired
* (limited to a page for sanity)
* offset -- number of records to skip
*/
static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
unsigned long maxnum, unsigned long offset)
{
int num;
void *buf;
size_t size;
/* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
size = maxnum * sizeof(struct __fdb_entry);
buf = kmalloc(size, GFP_USER);
if (!buf)
return -ENOMEM;
num = br_fdb_fillbuf(br, buf, maxnum, offset);
if (num > 0) {
if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
num = -EFAULT;
}
kfree(buf);
return num;
}
#if defined(CONFIG_MIPS_BRCM)
static int add_fdb_entries(struct net_bridge *br, void __user *userbuf,
unsigned long maxnum, int ifindex)
{
struct net_device *dev;
unsigned char *pMacAddr = NULL;
unsigned char *pMac = NULL;
int size;
int i;
int ret = 0;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
dev = dev_get_by_index(dev_net(br->dev), ifindex);
if (dev == NULL)
return -EINVAL;
size = maxnum * ETH_ALEN;
pMacAddr = kmalloc(size, GFP_KERNEL);
if (!pMacAddr)
return -ENOMEM;
copy_from_user(pMacAddr, userbuf, size);
pMac = pMacAddr;
for ( i = 0; i < maxnum; i++ )
{
ret = br_fdb_adddel_static(br, dev->br_port, (const unsigned char *)pMac, 1);
pMac += ETH_ALEN;
}
kfree(pMacAddr);
return ret;
}
static int delete_fdb_entries(struct net_bridge *br, void __user *userbuf,
unsigned long maxnum, int ifindex)
{
struct net_device *dev;
unsigned char *pMacAddr = NULL;
unsigned char *pMac = NULL;
int size;
int i;
int ret = 0;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
dev = dev_get_by_index(dev_net(br->dev), ifindex);
if (dev == NULL)
return -EINVAL;
size = maxnum * ETH_ALEN;
pMacAddr = kmalloc(size, GFP_KERNEL);
if (!pMacAddr)
{
dev_put(dev);
return -ENOMEM;
}
copy_from_user(pMacAddr, userbuf, size);
pMac = pMacAddr;
for ( i = 0; i < maxnum; i++ )
{
ret = br_fdb_adddel_static(br, dev->br_port, (const unsigned char *)pMac, 0);
pMac += ETH_ALEN;
}
kfree(pMacAddr);
dev_put(dev);
return ret;
}
static int set_flows(struct net_bridge *br, int rxifindex, int txifindex)
{
struct net_device *rxdev, *txdev;
int ret = 0;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
rxdev = dev_get_by_index(dev_net(br->dev), rxifindex);
if (rxdev == NULL)
return -EINVAL;
txdev = dev_get_by_index(dev_net(br->dev), txifindex);
if (txdev == NULL)
return -EINVAL;
br_flow_blog_rules(br, rxdev, txdev);
dev_put(rxdev);
dev_put(txdev);
return ret;
}
struct net_device *bridge_get_next_port(char *brName, unsigned int *brPort)
{
struct net_bridge_port *cp;
struct net_bridge_port *np;
struct net_bridge *br;
struct net_device *dev;
struct net_device *prtDev;
dev = dev_get_by_name(&init_net, brName);
if(!dev)
return NULL;
br = netdev_priv(dev);
rcu_read_lock();
if (list_empty(&br->port_list))
{
rcu_read_unlock();
dev_put(dev);
return NULL;
}
if (*brPort == 0xFFFFFFFF)
{
np = list_first_entry(&br->port_list, struct net_bridge_port, list);
*brPort = np->port_no;
prtDev = np->dev;
}
else
{
cp = br_get_port(br, *brPort);
if ( cp )
{
if (list_is_last(&cp->list, &br->port_list))
{
prtDev = NULL;
}
else
{
np = list_first_entry(&cp->list, struct net_bridge_port, list);
*brPort = np->port_no;
prtDev = np->dev;
}
}
else
{
prtDev = NULL;
}
}
rcu_read_unlock();
dev_put(dev);
return prtDev;
}
EXPORT_SYMBOL(bridge_get_next_port);
static RAW_NOTIFIER_HEAD(bridge_event_chain);
int register_bridge_notifier(struct notifier_block *nb)
{
return raw_notifier_chain_register(&bridge_event_chain, nb);
}
EXPORT_SYMBOL(register_bridge_notifier);
int unregister_bridge_notifier(struct notifier_block *nb)
{
return raw_notifier_chain_unregister(&bridge_event_chain, nb);
}
EXPORT_SYMBOL(unregister_bridge_notifier);
#endif
static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
{
struct net_device *dev;
int ret;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
dev = dev_get_by_index(dev_net(br->dev), ifindex);
if (dev == NULL)
return -EINVAL;
if (isadd)
ret = br_add_if(br, dev);
else
ret = br_del_if(br, dev);
#if defined(CONFIG_MIPS_BRCM)
raw_notifier_call_chain(&bridge_event_chain, BREVT_IF_CHANGED, &br->dev->name);
#endif
dev_put(dev);
return ret;
}
/*
* Legacy ioctl's through SIOCDEVPRIVATE
* This interface is deprecated because it was too difficult to
* to do the translation for 32/64bit ioctl compatability.
*/
static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct net_bridge *br = netdev_priv(dev);
unsigned long args[4];
if (copy_from_user(args, rq->ifr_data, sizeof(args)))
return -EFAULT;
switch (args[0]) {
case BRCTL_ADD_IF:
case BRCTL_DEL_IF:
return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
case BRCTL_GET_BRIDGE_INFO:
{
struct __bridge_info b;
memset(&b, 0, sizeof(struct __bridge_info));
rcu_read_lock();
memcpy(&b.designated_root, &br->designated_root, 8);
memcpy(&b.bridge_id, &br->bridge_id, 8);
b.root_path_cost = br->root_path_cost;
b.max_age = jiffies_to_clock_t(br->max_age);
b.hello_time = jiffies_to_clock_t(br->hello_time);
b.forward_delay = br->forward_delay;
b.bridge_max_age = br->bridge_max_age;
b.bridge_hello_time = br->bridge_hello_time;
b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
b.topology_change = br->topology_change;
b.topology_change_detected = br->topology_change_detected;
b.root_port = br->root_port;
b.stp_enabled = (br->stp_enabled != BR_NO_STP);
b.ageing_time = jiffies_to_clock_t(br->ageing_time);
b.hello_timer_value = br_timer_value(&br->hello_timer);
b.tcn_timer_value = br_timer_value(&br->tcn_timer);
b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
b.gc_timer_value = br_timer_value(&br->gc_timer);
rcu_read_unlock();
if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
return -EFAULT;
return 0;
}
case BRCTL_GET_PORT_LIST:
{
int num, *indices;
num = args[2];
if (num < 0)
return -EINVAL;
if (num == 0)
num = 256;
if (num > BR_MAX_PORTS)
num = BR_MAX_PORTS;
indices = kcalloc(num, sizeof(int), GFP_KERNEL);
if (indices == NULL)
return -ENOMEM;
get_port_ifindices(br, indices, num);
if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
num = -EFAULT;
kfree(indices);
return num;
}
case BRCTL_SET_BRIDGE_FORWARD_DELAY:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
spin_lock_bh(&br->lock);
br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
if (br_is_root_bridge(br))
br->forward_delay = br->bridge_forward_delay;
spin_unlock_bh(&br->lock);
return 0;
case BRCTL_SET_BRIDGE_HELLO_TIME:
{
unsigned long t = clock_t_to_jiffies(args[1]);
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (t < HZ)
return -EINVAL;
spin_lock_bh(&br->lock);
br->bridge_hello_time = t;
if (br_is_root_bridge(br))
br->hello_time = br->bridge_hello_time;
spin_unlock_bh(&br->lock);
return 0;
}
case BRCTL_SET_BRIDGE_MAX_AGE:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
spin_lock_bh(&br->lock);
br->bridge_max_age = clock_t_to_jiffies(args[1]);
if (br_is_root_bridge(br))
br->max_age = br->bridge_max_age;
spin_unlock_bh(&br->lock);
return 0;
case BRCTL_SET_AGEING_TIME:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
br->ageing_time = clock_t_to_jiffies(args[1]);
return 0;
case BRCTL_GET_PORT_INFO:
{
struct __port_info p;
struct net_bridge_port *pt;
rcu_read_lock();
if ((pt = br_get_port(br, args[2])) == NULL) {
rcu_read_unlock();
return -EINVAL;
}
memset(&p, 0, sizeof(struct __port_info));
memcpy(&p.designated_root, &pt->designated_root, 8);
memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
p.port_id = pt->port_id;
p.designated_port = pt->designated_port;
p.path_cost = pt->path_cost;
p.designated_cost = pt->designated_cost;
p.state = pt->state;
p.top_change_ack = pt->topology_change_ack;
p.config_pending = pt->config_pending;
p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
p.hold_timer_value = br_timer_value(&pt->hold_timer);
rcu_read_unlock();
if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
return -EFAULT;
return 0;
}
case BRCTL_SET_BRIDGE_STP_STATE:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
br_stp_set_enabled(br, args[1]);
return 0;
case BRCTL_SET_BRIDGE_PRIORITY:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
spin_lock_bh(&br->lock);
br_stp_set_bridge_priority(br, args[1]);
spin_unlock_bh(&br->lock);
return 0;
case BRCTL_SET_PORT_PRIORITY:
{
struct net_bridge_port *p;
int ret = 0;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (args[2] >= (1<<(16-BR_PORT_BITS)))
return -ERANGE;
spin_lock_bh(&br->lock);
if ((p = br_get_port(br, args[1])) == NULL)
ret = -EINVAL;
else
br_stp_set_port_priority(p, args[2]);
spin_unlock_bh(&br->lock);
return ret;
}
case BRCTL_SET_PATH_COST:
{
struct net_bridge_port *p;
int ret = 0;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if ((p = br_get_port(br, args[1])) == NULL)
ret = -EINVAL;
else
br_stp_set_path_cost(p, args[2]);
return ret;
}
case BRCTL_GET_FDB_ENTRIES:
return get_fdb_entries(br, (void __user *)args[1],
args[2], args[3]);
#if defined(CONFIG_MIPS_BRCM)
case BRCTL_ADD_FDB_ENTRIES:
return add_fdb_entries(br, (void __user *)args[1],
args[2], args[3]);
case BRCTL_DEL_FDB_ENTRIES:
return delete_fdb_entries(br, (void __user *)args[1],
args[2], args[3]);
case BRCTL_SET_FLOWS:
return set_flows(br, args[1], args[2]);
#endif
}
return -EOPNOTSUPP;
}
static int old_deviceless(struct net *net, void __user *uarg)
{
unsigned long args[3];
if (copy_from_user(args, uarg, sizeof(args)))
return -EFAULT;
switch (args[0]) {
case BRCTL_GET_VERSION:
return BRCTL_VERSION;
case BRCTL_GET_BRIDGES:
{
int *indices;
int ret = 0;
if (args[2] >= 2048)
return -ENOMEM;
indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
if (indices == NULL)
return -ENOMEM;
args[2] = get_bridge_ifindices(net, indices, args[2]);
ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
? -EFAULT : args[2];
kfree(indices);
return ret;
}
case BRCTL_ADD_BRIDGE:
case BRCTL_DEL_BRIDGE:
{
char buf[IFNAMSIZ];
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
return -EFAULT;
buf[IFNAMSIZ-1] = 0;
if (args[0] == BRCTL_ADD_BRIDGE)
return br_add_bridge(net, buf);
return br_del_bridge(net, buf);
}
#if defined(CONFIG_MIPS_BRCM) && defined(CONFIG_BR_IGMP_SNOOP)
case BRCTL_ENABLE_SNOOPING:
{
char buf[IFNAMSIZ];
struct net_device *dev;
struct net_bridge *br;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
return -EFAULT;
buf[IFNAMSIZ-1] = 0;
dev = dev_get_by_name(&init_net, buf);
if (dev == NULL)
return -ENXIO; /* Could not find device */
br = netdev_priv(dev);
br->igmp_snooping = args[2];
dev_put(dev);
return 0;
}
case BRCTL_ENABLE_PROXY_MODE:
{
char buf[IFNAMSIZ];
struct net_device *dev;
struct net_bridge *br;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
return -EFAULT;
buf[IFNAMSIZ-1] = 0;
dev = dev_get_by_name(&init_net, buf);
if (dev == NULL)
return -ENXIO; /* Could not find device */
br = netdev_priv(dev);
br->igmp_proxy = args[2];
dev_put(dev);
return 0;
}
#endif
#if defined(CONFIG_MIPS_BRCM) && defined(CONFIG_BR_MLD_SNOOP)
case BRCTL_MLD_ENABLE_SNOOPING:
{
char buf[IFNAMSIZ];
struct net_device *dev;
struct net_bridge *br;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
return -EFAULT;
buf[IFNAMSIZ-1] = 0;
dev = dev_get_by_name(&init_net, buf);
if (dev == NULL)
return -ENXIO; /* Could not find device */
br = netdev_priv(dev);
br->mld_snooping = args[2];
if(br->mld_snooping==SNOOPING_DISABLED_MODE)
br_mcast_wl_flush(br) ;
dev_put(dev);
return 0;
}
case BRCTL_MLD_ENABLE_PROXY_MODE:
{
char buf[IFNAMSIZ];
struct net_device *dev;
struct net_bridge *br;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
return -EFAULT;
buf[IFNAMSIZ-1] = 0;
dev = dev_get_by_name(&init_net, buf);
if (dev == NULL)
return -ENXIO; /* Could not find device */
br = netdev_priv(dev);
br->mld_proxy = args[2];
dev_put(dev);
return 0;
}
#endif
#if defined(CONFIG_MIPS_BRCM)
case BRCTL_ENABLE_IGMP_RATE_LIMIT:
{
char buf[IFNAMSIZ];
struct net_device *dev;
struct net_bridge *br;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
{
return -EFAULT;
}
buf[IFNAMSIZ-1] = 0;
dev = dev_get_by_name(&init_net, buf);
if (dev == NULL)
{
return -ENXIO; /* Could not find device */
}
if (args[2] > 500)
{
dev_put(dev);
return -EINVAL; /* Could not find device */
}
br = netdev_priv(dev);
br->igmp_rate_limit = args[2];
br->igmp_rate_last_packet = ktime_set(0,0);
br->igmp_rate_bucket = 0;
br->igmp_rate_rem_time = 0;
dev_put(dev);
return 0;
}
#if defined(CONFIG_BCM96828) && !defined(CONFIG_EPON_HGU)
case BRCTL_SET_UNI_UNI_CTRL:
{
bcmFun_t *regFunc;
BCM_EnetHandle_t param;
BCM_EponHandle_t epon_param;
char rxif[16], txif[16];
int i, j, uniport_cnt = 0;
char buf[IFNAMSIZ];
struct net_device *dev, *rxdev, *txdev;
struct net_bridge *br;
uni_uni_enabled = args[2];
if ((regFunc = bcmFun_get(BCM_FUN_ID_ENET_HANDLE))) {
param.type = BCM_ENET_FUN_TYPE_UNI_UNI_CTRL;
param.enable = uni_uni_enabled;
regFunc((void *)&param);
}
if ((regFunc = bcmFun_get(BCM_FUN_ID_EPON_HANDLE))) {
epon_param.type = BCM_EPON_FUN_TYPE_UNI_UNI_CTRL;
epon_param.enable = uni_uni_enabled;
regFunc((void *)&epon_param);
}
if ((regFunc = bcmFun_get(BCM_FUN_ID_ENET_HANDLE))) {
param.type = BCM_ENET_FUN_TYPE_GET_VPORT_CNT;
regFunc((void *)&param);
uniport_cnt = param.uniport_cnt;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
return -EFAULT;
buf[IFNAMSIZ-1] = 0;
dev = dev_get_by_name(&init_net, buf);
if (dev == NULL)
return -ENXIO;
br = netdev_priv(dev);
param.type = BCM_ENET_FUN_TYPE_GET_IF_NAME_OF_VPORT;
for(i = 1; i <= uniport_cnt; i++) {
param.port = i;
regFunc((void *)&param);
strcpy(rxif, param.name);
strcat(rxif,".v0");
rxdev = dev_get_by_name(&init_net, rxif);
if (rxdev == NULL)
return -ENXIO;
for(j = 1; j <= uniport_cnt; j++) {
if (i != j) {
param.port = j;
regFunc((void *)&param);
strcpy(txif, param.name);
strcat(txif,".v0");
txdev = dev_get_by_name(&init_net, txif);
if (txdev == NULL)
return -ENXIO;
if (uni_uni_enabled) {
br_flow_blog_rules(br, rxdev, txdev);
} else {
br_flow_path_delete(br, rxdev, txdev);
}
dev_put(txdev);
}
}
dev_put(rxdev);
}
dev_put(dev);
}
return 0;
}
#endif
#endif
}
return -EOPNOTSUPP;
}
int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
{
switch (cmd) {
case SIOCGIFBR:
case SIOCSIFBR:
return old_deviceless(net, uarg);
case SIOCBRADDBR:
case SIOCBRDELBR:
{
char buf[IFNAMSIZ];
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, uarg, IFNAMSIZ))
return -EFAULT;
buf[IFNAMSIZ-1] = 0;
if (cmd == SIOCBRADDBR)
return br_add_bridge(net, buf);
return br_del_bridge(net, buf);
}
}
return -EOPNOTSUPP;
}
int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct net_bridge *br = netdev_priv(dev);
switch(cmd) {
case SIOCDEVPRIVATE:
return old_dev_ioctl(dev, rq, cmd);
case SIOCBRADDIF:
case SIOCBRDELIF:
return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
}
pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
return -EOPNOTSUPP;
}
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