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linux-loongson/net/wanrouter/wanmain.c
Arnd Bergmann 15fd0cd9a2 net: autoconvert trivial BKL users to private mutex 
All these files use the big kernel lock in a trivial
way to serialize their private file operations,
typically resulting from an earlier semi-automatic
pushdown from VFS.

None of these drivers appears to want to lock against
other code, and they all use the BKL as the top-level
lock in their file operations, meaning that there
is no lock-order inversion problem.

Consequently, we can remove the BKL completely,
replacing it with a per-file mutex in every case.
Using a scripted approach means we can avoid
typos.

file=$1
name=$2
if grep -q lock_kernel ${file} ; then
    if grep -q 'include.*linux.mutex.h' ${file} ; then
            sed -i '/include.*<linux\/smp_lock.h>/d' ${file}
    else
            sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file}
    fi
    sed -i ${file} \
        -e "/^#include.*linux.mutex.h/,$ {
                1,/^\(static\|int\|long\)/ {
                     /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex);

} }"  \
    -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \
    -e '/[      ]*cycle_kernel_lock();/d'
else
    sed -i -e '/include.*\<smp_lock.h\>/d' ${file}  \
                -e '/cycle_kernel_lock()/d'
fi

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-07-12 20:21:47 -07:00

790 lines
19 KiB
C
Raw Blame History

/*****************************************************************************
* wanmain.c WAN Multiprotocol Router Module. Main code.
*
* This module is completely hardware-independent and provides
* the following common services for the WAN Link Drivers:
* o WAN device management (registering, unregistering)
* o Network interface management
* o Physical connection management (dial-up, incoming calls)
* o Logical connection management (switched virtual circuits)
* o Protocol encapsulation/decapsulation
*
* Author: Gideon Hack
*
* Copyright: (c) 1995-1999 Sangoma Technologies Inc.
*
* 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.
* ============================================================================
* Nov 24, 2000 Nenad Corbic Updated for 2.4.X kernels
* Nov 07, 2000 Nenad Corbic Fixed the Mulit-Port PPP for kernels 2.2.16 and
* greater.
* Aug 2, 2000 Nenad Corbic Block the Multi-Port PPP from running on
* kernels 2.2.16 or greater. The SyncPPP
* has changed.
* Jul 13, 2000 Nenad Corbic Added SyncPPP support
* Added extra debugging in device_setup().
* Oct 01, 1999 Gideon Hack Update for s514 PCI card
* Dec 27, 1996 Gene Kozin Initial version (based on Sangoma's WANPIPE)
* Jan 16, 1997 Gene Kozin router_devlist made public
* Jan 31, 1997 Alan Cox Hacked it about a bit for 2.1
* Jun 27, 1997 Alan Cox realigned with vendor code
* Oct 15, 1997 Farhan Thawar changed wan_encapsulate to add a pad byte of 0
* Apr 20, 1998 Alan Cox Fixed 2.1 symbols
* May 17, 1998 K. Baranowski Fixed SNAP encapsulation in wan_encapsulate
* Dec 15, 1998 Arnaldo Melo support for firmwares of up to 128000 bytes
* check wandev->setup return value
* Dec 22, 1998 Arnaldo Melo vmalloc/vfree used in device_setup to allocate
* kernel memory and copy configuration data to
* kernel space (for big firmwares)
* Jun 02, 1999 Gideon Hack Updates for Linux 2.0.X and 2.2.X kernels.
*****************************************************************************/
#include <linux/stddef.h> /* offsetof(), etc. */
#include <linux/capability.h>
#include <linux/errno.h> /* return codes */
#include <linux/kernel.h>
#include <linux/module.h> /* support for loadable modules */
#include <linux/slab.h> /* kmalloc(), kfree() */
#include <linux/mutex.h>
#include <linux/mm.h>
#include <linux/string.h> /* inline mem*, str* functions */
#include <asm/byteorder.h> /* htons(), etc. */
#include <linux/wanrouter.h> /* WAN router API definitions */
#include <linux/vmalloc.h> /* vmalloc, vfree */
#include <asm/uaccess.h> /* copy_to/from_user */
#include <linux/init.h> /* __initfunc et al. */
#define KMEM_SAFETYZONE 8
#define DEV_TO_SLAVE(dev) (*((struct net_device **)netdev_priv(dev)))
/*
* Function Prototypes
*/
/*
* WAN device IOCTL handlers
*/
static DEFINE_MUTEX(wanrouter_mutex);
static int wanrouter_device_setup(struct wan_device *wandev,
wandev_conf_t __user *u_conf);
static int wanrouter_device_stat(struct wan_device *wandev,
wandev_stat_t __user *u_stat);
static int wanrouter_device_shutdown(struct wan_device *wandev);
static int wanrouter_device_new_if(struct wan_device *wandev,
wanif_conf_t __user *u_conf);
static int wanrouter_device_del_if(struct wan_device *wandev,
char __user *u_name);
/*
* Miscellaneous
*/
static struct wan_device *wanrouter_find_device(char *name);
static int wanrouter_delete_interface(struct wan_device *wandev, char *name);
static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
__acquires(lock);
static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
__releases(lock);
/*
* Global Data
*/
static char wanrouter_fullname[] = "Sangoma WANPIPE Router";
static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
static char wanrouter_modname[] = ROUTER_NAME; /* short module name */
struct wan_device* wanrouter_router_devlist; /* list of registered devices */
/*
* Organize Unique Identifiers for encapsulation/decapsulation
*/
#if 0
static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 };
#endif
static int __init wanrouter_init(void)
{
int err;
printk(KERN_INFO "%s v%u.%u %s\n",
wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE,
wanrouter_copyright);
err = wanrouter_proc_init();
if (err)
printk(KERN_INFO "%s: can't create entry in proc filesystem!\n",
wanrouter_modname);
return err;
}
static void __exit wanrouter_cleanup (void)
{
wanrouter_proc_cleanup();
}
/*
* This is just plain dumb. We should move the bugger to drivers/net/wan,
* slap it first in directory and make it module_init(). The only reason
* for subsys_initcall() here is that net goes after drivers (why, BTW?)
*/
subsys_initcall(wanrouter_init);
module_exit(wanrouter_cleanup);
/*
* Kernel APIs
*/
/*
* Register WAN device.
* o verify device credentials
* o create an entry for the device in the /proc/net/router directory
* o initialize internally maintained fields of the wan_device structure
* o link device data space to a singly-linked list
* o if it's the first device, then start kernel 'thread'
* o increment module use count
*
* Return:
* 0 Ok
* < 0 error.
*
* Context: process
*/
int register_wan_device(struct wan_device *wandev)
{
int err, namelen;
if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) ||
(wandev->name == NULL))
return -EINVAL;
namelen = strlen(wandev->name);
if (!namelen || (namelen > WAN_DRVNAME_SZ))
return -EINVAL;
if (wanrouter_find_device(wandev->name))
return -EEXIST;
#ifdef WANDEBUG
printk(KERN_INFO "%s: registering WAN device %s\n",
wanrouter_modname, wandev->name);
#endif
/*
* Register /proc directory entry
*/
err = wanrouter_proc_add(wandev);
if (err) {
printk(KERN_INFO
"%s: can't create /proc/net/router/%s entry!\n",
wanrouter_modname, wandev->name);
return err;
}
/*
* Initialize fields of the wan_device structure maintained by the
* router and update local data.
*/
wandev->ndev = 0;
wandev->dev = NULL;
wandev->next = wanrouter_router_devlist;
wanrouter_router_devlist = wandev;
return 0;
}
/*
* Unregister WAN device.
* o shut down device
* o unlink device data space from the linked list
* o delete device entry in the /proc/net/router directory
* o decrement module use count
*
* Return: 0 Ok
* <0 error.
* Context: process
*/
int unregister_wan_device(char *name)
{
struct wan_device *wandev, *prev;
if (name == NULL)
return -EINVAL;
for (wandev = wanrouter_router_devlist, prev = NULL;
wandev && strcmp(wandev->name, name);
prev = wandev, wandev = wandev->next)
;
if (wandev == NULL)
return -ENODEV;
#ifdef WANDEBUG
printk(KERN_INFO "%s: unregistering WAN device %s\n",
wanrouter_modname, name);
#endif
if (wandev->state != WAN_UNCONFIGURED)
wanrouter_device_shutdown(wandev);
if (prev)
prev->next = wandev->next;
else
wanrouter_router_devlist = wandev->next;
wanrouter_proc_delete(wandev);
return 0;
}
#if 0
/*
* Encapsulate packet.
*
* Return: encapsulation header size
* < 0 - unsupported Ethertype
*
* Notes:
* 1. This function may be called on interrupt context.
*/
int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev,
unsigned short type)
{
int hdr_len = 0;
switch (type) {
case ETH_P_IP: /* IP datagram encapsulation */
hdr_len += 1;
skb_push(skb, 1);
skb->data[0] = NLPID_IP;
break;
case ETH_P_IPX: /* SNAP encapsulation */
case ETH_P_ARP:
hdr_len += 7;
skb_push(skb, 7);
skb->data[0] = 0;
skb->data[1] = NLPID_SNAP;
skb_copy_to_linear_data_offset(skb, 2, wanrouter_oui_ether,
sizeof(wanrouter_oui_ether));
*((unsigned short*)&skb->data[5]) = htons(type);
break;
default: /* Unknown packet type */
printk(KERN_INFO
"%s: unsupported Ethertype 0x%04X on interface %s!\n",
wanrouter_modname, type, dev->name);
hdr_len = -EINVAL;
}
return hdr_len;
}
/*
* Decapsulate packet.
*
* Return: Ethertype (in network order)
* 0 unknown encapsulation
*
* Notes:
* 1. This function may be called on interrupt context.
*/
__be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
{
int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
__be16 ethertype;
switch (skb->data[cnt]) {
case NLPID_IP: /* IP datagramm */
ethertype = htons(ETH_P_IP);
cnt += 1;
break;
case NLPID_SNAP: /* SNAP encapsulation */
if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
sizeof(wanrouter_oui_ether))){
printk(KERN_INFO
"%s: unsupported SNAP OUI %02X-%02X-%02X "
"on interface %s!\n", wanrouter_modname,
skb->data[cnt+1], skb->data[cnt+2],
skb->data[cnt+3], dev->name);
return 0;
}
ethertype = *((__be16*)&skb->data[cnt+4]);
cnt += 6;
break;
/* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */
default:
printk(KERN_INFO
"%s: unsupported NLPID 0x%02X on interface %s!\n",
wanrouter_modname, skb->data[cnt], dev->name);
return 0;
}
skb->protocol = ethertype;
skb->pkt_type = PACKET_HOST; /* Physically point to point */
skb_pull(skb, cnt);
skb_reset_mac_header(skb);
return ethertype;
}
#endif /* 0 */
/*
* WAN device IOCTL.
* o find WAN device associated with this node
* o execute requested action or pass command to the device driver
*/
long wanrouter_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file->f_path.dentry->d_inode;
int err = 0;
struct proc_dir_entry *dent;
struct wan_device *wandev;
void __user *data = (void __user *)arg;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if ((cmd >> 8) != ROUTER_IOCTL)
return -EINVAL;
dent = PDE(inode);
if ((dent == NULL) || (dent->data == NULL))
return -EINVAL;
wandev = dent->data;
if (wandev->magic != ROUTER_MAGIC)
return -EINVAL;
mutex_lock(&wanrouter_mutex);
switch (cmd) {
case ROUTER_SETUP:
err = wanrouter_device_setup(wandev, data);
break;
case ROUTER_DOWN:
err = wanrouter_device_shutdown(wandev);
break;
case ROUTER_STAT:
err = wanrouter_device_stat(wandev, data);
break;
case ROUTER_IFNEW:
err = wanrouter_device_new_if(wandev, data);
break;
case ROUTER_IFDEL:
err = wanrouter_device_del_if(wandev, data);
break;
case ROUTER_IFSTAT:
break;
default:
if ((cmd >= ROUTER_USER) &&
(cmd <= ROUTER_USER_MAX) &&
wandev->ioctl)
err = wandev->ioctl(wandev, cmd, arg);
else err = -EINVAL;
}
mutex_unlock(&wanrouter_mutex);
return err;
}
/*
* WAN Driver IOCTL Handlers
*/
/*
* Setup WAN link device.
* o verify user address space
* o allocate kernel memory and copy configuration data to kernel space
* o if configuration data includes extension, copy it to kernel space too
* o call driver's setup() entry point
*/
static int wanrouter_device_setup(struct wan_device *wandev,
wandev_conf_t __user *u_conf)
{
void *data = NULL;
wandev_conf_t *conf;
int err = -EINVAL;
if (wandev->setup == NULL) { /* Nothing to do ? */
printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
wandev->name);
return 0;
}
conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
if (conf == NULL){
printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
wandev->name);
return -ENOBUFS;
}
if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
wandev->name);
kfree(conf);
return -EFAULT;
}
if (conf->magic != ROUTER_MAGIC) {
kfree(conf);
printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
wandev->name);
return -EINVAL;
}
if (conf->data_size && conf->data) {
if (conf->data_size > 128000) {
printk(KERN_INFO
"%s: ERROR, Invalid firmware data size %i !\n",
wandev->name, conf->data_size);
kfree(conf);
return -EINVAL;
}
data = vmalloc(conf->data_size);
if (!data) {
printk(KERN_INFO
"%s: ERROR, Faild allocate kernel memory !\n",
wandev->name);
kfree(conf);
return -ENOBUFS;
}
if (!copy_from_user(data, conf->data, conf->data_size)) {
conf->data = data;
err = wandev->setup(wandev, conf);
} else {
printk(KERN_INFO
"%s: ERROR, Faild to copy from user data !\n",
wandev->name);
err = -EFAULT;
}
vfree(data);
} else {
printk(KERN_INFO
"%s: ERROR, No firmware found ! Firmware size = %i !\n",
wandev->name, conf->data_size);
}
kfree(conf);
return err;
}
/*
* Shutdown WAN device.
* o delete all not opened logical channels for this device
* o call driver's shutdown() entry point
*/
static int wanrouter_device_shutdown(struct wan_device *wandev)
{
struct net_device *dev;
int err=0;
if (wandev->state == WAN_UNCONFIGURED)
return 0;
printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
for (dev = wandev->dev; dev;) {
err = wanrouter_delete_interface(wandev, dev->name);
if (err)
return err;
/* The above function deallocates the current dev
* structure. Therefore, we cannot use netdev_priv(dev)
* as the next element: wandev->dev points to the
* next element */
dev = wandev->dev;
}
if (wandev->ndev)
return -EBUSY; /* there are opened interfaces */
if (wandev->shutdown)
err=wandev->shutdown(wandev);
return err;
}
/*
* Get WAN device status & statistics.
*/
static int wanrouter_device_stat(struct wan_device *wandev,
wandev_stat_t __user *u_stat)
{
wandev_stat_t stat;
memset(&stat, 0, sizeof(stat));
/* Ask device driver to update device statistics */
if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
wandev->update(wandev);
/* Fill out structure */
stat.ndev = wandev->ndev;
stat.state = wandev->state;
if (copy_to_user(u_stat, &stat, sizeof(stat)))
return -EFAULT;
return 0;
}
/*
* Create new WAN interface.
* o verify user address space
* o copy configuration data to kernel address space
* o allocate network interface data space
* o call driver's new_if() entry point
* o make sure there is no interface name conflict
* o register network interface
*/
static int wanrouter_device_new_if(struct wan_device *wandev,
wanif_conf_t __user *u_conf)
{
wanif_conf_t *cnf;
struct net_device *dev = NULL;
int err;
if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
return -ENODEV;
cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
if (!cnf)
return -ENOBUFS;
err = -EFAULT;
if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
goto out;
err = -EINVAL;
if (cnf->magic != ROUTER_MAGIC)
goto out;
if (cnf->config_id == WANCONFIG_MPPP) {
printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
wandev->name);
err = -EPROTONOSUPPORT;
goto out;
} else {
err = wandev->new_if(wandev, dev, cnf);
}
if (!err) {
/* Register network interface. This will invoke init()
* function supplied by the driver. If device registered
* successfully, add it to the interface list.
*/
if (dev->name == NULL) {
err = -EINVAL;
} else {
#ifdef WANDEBUG
printk(KERN_INFO "%s: registering interface %s...\n",
wanrouter_modname, dev->name);
#endif
err = register_netdev(dev);
if (!err) {
struct net_device *slave = NULL;
unsigned long smp_flags=0;
lock_adapter_irq(&wandev->lock, &smp_flags);
if (wandev->dev == NULL) {
wandev->dev = dev;
} else {
for (slave=wandev->dev;
DEV_TO_SLAVE(slave);
slave = DEV_TO_SLAVE(slave))
DEV_TO_SLAVE(slave) = dev;
}
++wandev->ndev;
unlock_adapter_irq(&wandev->lock, &smp_flags);
err = 0; /* done !!! */
goto out;
}
}
if (wandev->del_if)
wandev->del_if(wandev, dev);
free_netdev(dev);
}
out:
kfree(cnf);
return err;
}
/*
* Delete WAN logical channel.
* o verify user address space
* o copy configuration data to kernel address space
*/
static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
{
char name[WAN_IFNAME_SZ + 1];
int err = 0;
if (wandev->state == WAN_UNCONFIGURED)
return -ENODEV;
memset(name, 0, sizeof(name));
if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
return -EFAULT;
err = wanrouter_delete_interface(wandev, name);
if (err)
return err;
/* If last interface being deleted, shutdown card
* This helps with administration at leaf nodes
* (You can tell if the person at the other end of the phone
* has an interface configured) and avoids DoS vulnerabilities
* in binary driver files - this fixes a problem with the current
* Sangoma driver going into strange states when all the network
* interfaces are deleted and the link irrecoverably disconnected.
*/
if (!wandev->ndev && wandev->shutdown)
err = wandev->shutdown(wandev);
return err;
}
/*
* Miscellaneous Functions
*/
/*
* Find WAN device by name.
* Return pointer to the WAN device data space or NULL if device not found.
*/
static struct wan_device *wanrouter_find_device(char *name)
{
struct wan_device *wandev;
for (wandev = wanrouter_router_devlist;
wandev && strcmp(wandev->name, name);
wandev = wandev->next);
return wandev;
}
/*
* Delete WAN logical channel identified by its name.
* o find logical channel by its name
* o call driver's del_if() entry point
* o unregister network interface
* o unlink channel data space from linked list of channels
* o release channel data space
*
* Return: 0 success
* -ENODEV channel not found.
* -EBUSY interface is open
*
* Note: If (force != 0), then device will be destroyed even if interface
* associated with it is open. It's caller's responsibility to make
* sure that opened interfaces are not removed!
*/
static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
{
struct net_device *dev = NULL, *prev = NULL;
unsigned long smp_flags=0;
lock_adapter_irq(&wandev->lock, &smp_flags);
dev = wandev->dev;
prev = NULL;
while (dev && strcmp(name, dev->name)) {
struct net_device **slave = netdev_priv(dev);
prev = dev;
dev = *slave;
}
unlock_adapter_irq(&wandev->lock, &smp_flags);
if (dev == NULL)
return -ENODEV; /* interface not found */
if (netif_running(dev))
return -EBUSY; /* interface in use */
if (wandev->del_if)
wandev->del_if(wandev, dev);
lock_adapter_irq(&wandev->lock, &smp_flags);
if (prev) {
struct net_device **prev_slave = netdev_priv(prev);
struct net_device **slave = netdev_priv(dev);
*prev_slave = *slave;
} else {
struct net_device **slave = netdev_priv(dev);
wandev->dev = *slave;
}
--wandev->ndev;
unlock_adapter_irq(&wandev->lock, &smp_flags);
printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
unregister_netdev(dev);
free_netdev(dev);
return 0;
}
static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
__acquires(lock)
{
spin_lock_irqsave(lock, *smp_flags);
}
static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
__releases(lock)
{
spin_unlock_irqrestore(lock, *smp_flags);
}
EXPORT_SYMBOL(register_wan_device);
EXPORT_SYMBOL(unregister_wan_device);
MODULE_LICENSE("GPL");
/*
* End
*/
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