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/*****************************************************************************
* 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 managenment (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/version.h>
#include <linux/config.h>
#include <linux/stddef.h> /* offsetof(), etc. */
#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/mm.h> /* verify_area(), etc. */
#include <linux/string.h> /* inline mem*, str* functions */
#include <asm/byteorder.h> /* htons(), etc. */
#include <linux/wanrouter.h> /* WAN router API definitions */
#if defined(LINUX_2_4)
#include <linux/vmalloc.h> /* vmalloc, vfree */
#include <asm/uaccess.h> /* copy_to/from_user */
#include <linux/init.h> /* __initfunc et al. */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,3)
#include <net/syncppp.h>
#else
#include <../drivers/net/wan/syncppp.h>
#endif
#elif defined(LINUX_2_1)
#define LINUX_2_1
#include <linux/vmalloc.h> /* vmalloc, vfree */
#include <asm/uaccess.h> /* copy_to/from_user */
#include <linux/init.h> /* __initfunc et al. */
#include <../drivers/net/syncppp.h>
#else
#include <asm/segment.h> /* kernel <-> user copy */
#endif
#define KMEM_SAFETYZONE 8
/***********FOR DEBUGGING PURPOSES*********************************************
static void * dbg_kmalloc(unsigned int size, int prio, int line) {
int i = 0;
void * v = kmalloc(size+sizeof(unsigned int)+2*KMEM_SAFETYZONE*8,prio);
char * c1 = v;
c1 += sizeof(unsigned int);
*((unsigned int *)v) = size;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
c1[0] = 'D'; c1[1] = 'E'; c1[2] = 'A'; c1[3] = 'D';
c1[4] = 'B'; c1[5] = 'E'; c1[6] = 'E'; c1[7] = 'F';
c1 += 8;
}
c1 += size;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
c1[0] = 'M'; c1[1] = 'U'; c1[2] = 'N'; c1[3] = 'G';
c1[4] = 'W'; c1[5] = 'A'; c1[6] = 'L'; c1[7] = 'L';
c1 += 8;
}
v = ((char *)v) + sizeof(unsigned int) + KMEM_SAFETYZONE*8;
printk(KERN_INFO "line %d kmalloc(%d,%d) = %p\n",line,size,prio,v);
return v;
}
static void dbg_kfree(void * v, int line) {
unsigned int * sp = (unsigned int *)(((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8));
unsigned int size = *sp;
char * c1 = ((char *)v) - KMEM_SAFETYZONE*8;
int i = 0;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
if ( c1[0] != 'D' || c1[1] != 'E' || c1[2] != 'A' || c1[3] != 'D'
|| c1[4] != 'B' || c1[5] != 'E' || c1[6] != 'E' || c1[7] != 'F') {
printk(KERN_INFO "kmalloced block at %p has been corrupted (underrun)!\n",v);
printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
}
c1 += 8;
}
c1 += size;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
if ( c1[0] != 'M' || c1[1] != 'U' || c1[2] != 'N' || c1[3] != 'G'
|| c1[4] != 'W' || c1[5] != 'A' || c1[6] != 'L' || c1[7] != 'L'
) {
printk(KERN_INFO "kmalloced block at %p has been corrupted (overrun):\n",v);
printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
}
c1 += 8;
}
printk(KERN_INFO "line %d kfree(%p)\n",line,v);
v = ((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8);
kfree(v);
}
#define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
#define kfree(x) dbg_kfree(x,__LINE__)
*****************************************************************************/
/*
* Function Prototypes
*/
/*
* Kernel loadable module interface.
*/
#ifdef MODULE
int init_module (void);
void cleanup_module (void);
#endif
/*
* WAN device IOCTL handlers
*/
static int device_setup(wan_device_t *wandev, wandev_conf_t *u_conf);
static int device_stat(wan_device_t *wandev, wandev_stat_t *u_stat);
static int device_shutdown(wan_device_t *wandev);
static int device_new_if(wan_device_t *wandev, wanif_conf_t *u_conf);
static int device_del_if(wan_device_t *wandev, char *u_name);
/*
* Miscellaneous
*/
static wan_device_t *find_device (char *name);
static int delete_interface (wan_device_t *wandev, char *name);
void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
/*
* Global Data
*/
static char fullname[] = "Sangoma WANPIPE Router";
static char copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
static char modname[] = ROUTER_NAME; /* short module name */
wan_device_t* router_devlist = NULL; /* list of registered devices */
static int devcnt = 0;
/*
* Organize Unique Identifiers for encapsulation/decapsulation
*/
static unsigned char oui_ether[] = { 0x00, 0x00, 0x00 };
#if 0
static unsigned char oui_802_2[] = { 0x00, 0x80, 0xC2 };
#endif
#ifndef MODULE
int wanrouter_init(void)
{
int err;
extern int wanpipe_init(void);
extern int sdladrv_init(void);
printk(KERN_INFO "%s v%u.%u %s\n",
fullname, ROUTER_VERSION, ROUTER_RELEASE, copyright);
err = wanrouter_proc_init();
if (err){
printk(KERN_INFO "%s: can't create entry in proc filesystem!\n", modname);
}
/*
* Initialise compiled in boards
*/
#ifdef CONFIG_VENDOR_SANGOMA
sdladrv_init();
wanpipe_init();
#endif
return err;
}
#ifdef LINUX_2_4
static void __exit wanrouter_cleanup (void)
{
wanrouter_proc_cleanup();
}
#endif
#else
/*
* Kernel Loadable Module Entry Points
*/
/*
* Module 'insert' entry point.
* o print announcement
* o initialize static data
* o create /proc/net/router directory and static entries
*
* Return: 0 Ok
* < 0 error.
* Context: process
*/
int init_module (void)
{
int err;
printk(KERN_INFO "%s v%u.%u %s\n",
fullname, ROUTER_VERSION, ROUTER_RELEASE, copyright);
err = wanrouter_proc_init();
if (err){
printk(KERN_INFO
"%s: can't create entry in proc filesystem!\n", modname);
}
return err;
}
/*
* Module 'remove' entry point.
* o delete /proc/net/router directory and static entries.
*/
void cleanup_module (void)
{
wanrouter_proc_cleanup();
}
#endif
/*
* 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(wan_device_t *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 (find_device(wandev->name) != NULL)
return -EEXIST;
#ifdef WANDEBUG
printk(KERN_INFO "%s: registering WAN device %s\n",
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",
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 = router_devlist;
router_devlist = wandev;
++devcnt;
MOD_INC_USE_COUNT; /* prevent module from unloading */
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)
{
wan_device_t *wandev, *prev;
if (name == NULL)
return -EINVAL;
for (wandev = 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", modname, name);
#endif
if (wandev->state != WAN_UNCONFIGURED) {
device_shutdown(wandev);
}
if (prev){
prev->next = wandev->next;
}else{
router_devlist = wandev->next;
}
--devcnt;
wanrouter_proc_delete(wandev);
MOD_DEC_USE_COUNT;
return 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, netdevice_t *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;
memcpy(&skb->data[2], oui_ether, sizeof(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",
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.
*/
unsigned short wanrouter_type_trans (struct sk_buff *skb, netdevice_t *dev)
{
int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
unsigned short 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], oui_ether, sizeof(oui_ether))){
printk(KERN_INFO
"%s: unsupported SNAP OUI %02X-%02X-%02X "
"on interface %s!\n", modname,
skb->data[cnt+1], skb->data[cnt+2],
skb->data[cnt+3], dev->name);
return 0;
}
ethertype = *((unsigned short*)&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",
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->mac.raw = skb->data;
return ethertype;
}
/*
* WAN device IOCTL.
* o find WAN device associated with this node
* o execute requested action or pass command to the device driver
*/
int wanrouter_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
struct proc_dir_entry *dent;
wan_device_t *wandev;
#if defined (LINUX_2_1) || defined (LINUX_2_4)
if (!capable(CAP_NET_ADMIN)){
return -EPERM;
}
#endif
if ((cmd >> 8) != ROUTER_IOCTL)
return -EINVAL;
dent = inode->u.generic_ip;
if ((dent == NULL) || (dent->data == NULL))
return -EINVAL;
wandev = dent->data;
if (wandev->magic != ROUTER_MAGIC)
return -EINVAL;
switch (cmd) {
case ROUTER_SETUP:
err = device_setup(wandev, (void*)arg);
break;
case ROUTER_DOWN:
err = device_shutdown(wandev);
break;
case ROUTER_STAT:
err = device_stat(wandev, (void*)arg);
break;
case ROUTER_IFNEW:
err = device_new_if(wandev, (void*)arg);
break;
case ROUTER_IFDEL:
err = device_del_if(wandev, (void*)arg);
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;
}
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 device_setup (wan_device_t *wandev, wandev_conf_t *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;
}
#ifdef LINUX_2_0
err = verify_area (VERIFY_READ, u_conf, sizeof(wandev_conf_t));
if(err){
return err;
}
#endif
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 defined (LINUX_2_1) || defined (LINUX_2_4)
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;
}
#else
memcpy_fromfs ((void *)conf, (void *)u_conf, sizeof(wandev_conf_t));
#endif
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 || conf->data_size < 0) {
printk(KERN_INFO
"%s: ERROR, Invalid firmware data size %i !\n",
wandev->name, conf->data_size);
kfree(conf);
return -EINVAL;;
}
#if defined (LINUX_2_1) || defined (LINUX_2_4)
data = vmalloc(conf->data_size);
if (data) {
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;
}
}else{
printk(KERN_INFO
"%s: ERROR, Faild allocate kernel memory !\n",
wandev->name);
err = -ENOBUFS;
}
if (data){
vfree(data);
}
#else
err = verify_area(VERIFY_READ, conf->data, conf->data_size);
if (!err) {
data = kmalloc(conf->data_size, GFP_KERNEL);
if (data) {
memcpy_fromfs(data, (void*)conf->data,
conf->data_size);
conf->data = data;
}else{
printk(KERN_INFO
"%s: ERROR, Faild allocate kernel memory !\n",wandev->name);
err = -ENOMEM;
}
}else{
printk(KERN_INFO
"%s: ERROR, Faild to copy from user data !\n",wandev->name);
}
if (!err){
err = wandev->setup(wandev, conf);
}
if (data){
kfree(data);
}
#endif
}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 device_shutdown (wan_device_t *wandev)
{
netdevice_t *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;) {
if ((err=delete_interface(wandev, dev->name)) != 0){
return err;
}
/* The above function deallocates the current dev
* structure. Therefore, we cannot use dev->priv
* 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 device_stat (wan_device_t *wandev, wandev_stat_t *u_stat)
{
wandev_stat_t stat;
#ifdef LINUX_2_0
int err;
err = verify_area(VERIFY_WRITE, u_stat, sizeof(wandev_stat_t));
if (err)
return err;
#endif
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 defined (LINUX_2_1) || defined (LINUX_2_4)
if(copy_to_user(u_stat, &stat, sizeof(stat)))
return -EFAULT;
#else
memcpy_tofs((void*)u_stat, (void*)&stat, sizeof(stat));
#endif
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 device_new_if (wan_device_t *wandev, wanif_conf_t *u_conf)
{
wanif_conf_t conf;
netdevice_t *dev=NULL;
#ifdef CONFIG_WANPIPE_MULTPPP
struct ppp_device *pppdev=NULL;
#endif
int err;
if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
return -ENODEV;
#if defined (LINUX_2_1) || defined (LINUX_2_4)
if(copy_from_user(&conf, u_conf, sizeof(wanif_conf_t)))
return -EFAULT;
#else
err = verify_area(VERIFY_READ, u_conf, sizeof(wanif_conf_t));
if (err)
return err;
memcpy_fromfs((void*)&conf, (void*)u_conf, sizeof(wanif_conf_t));
#endif
if (conf.magic != ROUTER_MAGIC)
return -EINVAL;
err = -EPROTONOSUPPORT;
#ifdef CONFIG_WANPIPE_MULTPPP
if (conf.config_id == WANCONFIG_MPPP){
pppdev = kmalloc(sizeof(struct ppp_device), GFP_KERNEL);
if (pppdev == NULL){
return -ENOBUFS;
}
memset(pppdev, 0, sizeof(struct ppp_device));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,16)
pppdev->dev = kmalloc(sizeof(netdevice_t), GFP_KERNEL);
if (pppdev->dev == NULL){
kfree(pppdev);
return -ENOBUFS;
}
memset(pppdev->dev, 0, sizeof(netdevice_t));
#endif
err = wandev->new_if(wandev, (netdevice_t *)pppdev, &conf);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,16)
dev = pppdev->dev;
#else
dev = &pppdev->dev;
#endif
}else{
dev = kmalloc(sizeof(netdevice_t), GFP_KERNEL);
if (dev == NULL){
return -ENOBUFS;
}
memset(dev, 0, sizeof(netdevice_t));
err = wandev->new_if(wandev, dev, &conf);
}
#else
/* Sync PPP is disabled */
if (conf.config_id != WANCONFIG_MPPP){
dev = kmalloc(sizeof(netdevice_t), GFP_KERNEL);
if (dev == NULL){
return -ENOBUFS;
}
memset(dev, 0, sizeof(netdevice_t));
err = wandev->new_if(wandev, dev, &conf);
}else{
printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
wandev->name);
return err;
}
#endif
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 if (dev_get(dev->name)){
err = -EEXIST; /* name already exists */
}else{
#ifdef WANDEBUG
printk(KERN_INFO "%s: registering interface %s...\n",
modname, dev->name);
#endif
err = register_netdev(dev);
if (!err) {
netdevice_t *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;
*((netdevice_t**)slave->priv);
slave=*((netdevice_t**)slave->priv));
*((netdevice_t**)slave->priv) = dev;
}
++wandev->ndev;
unlock_adapter_irq(&wandev->lock, &smp_flags);
return 0; /* done !!! */
}
}
if (wandev->del_if)
wandev->del_if(wandev, dev);
}
/* This code has moved from del_if() function */
if (dev->priv){
kfree(dev->priv);
dev->priv=NULL;
}
#ifdef CONFIG_WANPIPE_MULTPPP
if (conf.config_id == WANCONFIG_MPPP){
kfree(pppdev);
}else{
kfree(dev);
}
#else
/* Sync PPP is disabled */
if (conf.config_id != WANCONFIG_MPPP){
kfree(dev);
}
#endif
return err;
}
/*
* Delete WAN logical channel.
* o verify user address space
* o copy configuration data to kernel address space
*/
static int device_del_if (wan_device_t *wandev, char *u_name)
{
char name[WAN_IFNAME_SZ + 1];
int err = 0;
if (wandev->state == WAN_UNCONFIGURED)
return -ENODEV;
#ifdef LINUX_2_0
err = verify_area(VERIFY_READ, u_name, WAN_IFNAME_SZ);
if (err)
return err;
#endif
memset(name, 0, sizeof(name));
#if defined (LINUX_2_1) || defined (LINUX_2_4)
if(copy_from_user(name, u_name, WAN_IFNAME_SZ))
return -EFAULT;
#else
memcpy_fromfs((void*)name, (void*)u_name, WAN_IFNAME_SZ);
#endif
err = 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 wan_device_t *find_device(char *name)
{
wan_device_t *wandev;
for (wandev = 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 delete_interface (wan_device_t *wandev, char *name)
{
netdevice_t *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)) {
netdevice_t **slave = dev->priv;
prev = dev;
dev = *slave;
}
unlock_adapter_irq(&wandev->lock, &smp_flags);
if (dev == NULL){
return -ENODEV; /* interface not found */
}
#ifdef LINUX_2_4
if (netif_running(dev)){
#else
if (dev->start) {
#endif
return -EBUSY; /* interface in use */
}
if (wandev->del_if)
wandev->del_if(wandev, dev);
lock_adapter_irq(&wandev->lock, &smp_flags);
if (prev) {
netdevice_t **prev_slave = prev->priv;
netdevice_t **slave = dev->priv;
*prev_slave = *slave;
} else {
netdevice_t **slave = dev->priv;
wandev->dev = *slave;
}
--wandev->ndev;
unlock_adapter_irq(&wandev->lock, &smp_flags);
printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
/* Due to new interface linking method using dev->priv,
* this code has moved from del_if() function.*/
if (dev->priv){
kfree(dev->priv);
dev->priv=NULL;
}
unregister_netdev(dev);
#ifdef LINUX_2_4
kfree(dev);
#else
if (dev->name){
kfree(dev->name);
}
kfree(dev);
#endif
return 0;
}
void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
{
#ifdef LINUX_2_0
save_flags(*smp_flags);
cli();
#else
spin_lock_irqsave(lock, *smp_flags);
#endif
}
void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
{
#ifdef LINUX_2_0
restore_flags(*smp_flags);
#else
spin_unlock_irqrestore(lock, *smp_flags);
#endif
}
#if defined (LINUX_2_1) || defined (LINUX_2_4)
EXPORT_SYMBOL(register_wan_device);
EXPORT_SYMBOL(unregister_wan_device);
EXPORT_SYMBOL(wanrouter_encapsulate);
EXPORT_SYMBOL(wanrouter_type_trans);
EXPORT_SYMBOL(lock_adapter_irq);
EXPORT_SYMBOL(unlock_adapter_irq);
#endif
/*
* End
*/
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