diff options
Diffstat (limited to 'net/wanrouter/wanmain.c')
| -rw-r--r-- | net/wanrouter/wanmain.c | 888 |
1 files changed, 888 insertions, 0 deletions
diff --git a/net/wanrouter/wanmain.c b/net/wanrouter/wanmain.c new file mode 100644 index 000000000000..956c17f6c548 --- /dev/null +++ b/net/wanrouter/wanmain.c @@ -0,0 +1,888 @@ +/***************************************************************************** +* 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/config.h> +#include <linux/stddef.h> /* offsetof(), etc. */ +#include <linux/errno.h> /* return codes */ +#include <linux/kernel.h> +#include <linux/init.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 */ + +#include <linux/vmalloc.h> /* vmalloc, vfree */ +#include <asm/uaccess.h> /* copy_to/from_user */ +#include <linux/init.h> /* __initfunc et al. */ +#include <net/syncppp.h> + +#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 + */ + +/* + * WAN device IOCTL handlers + */ + +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); +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 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 + */ + +static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 }; +#if 0 +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; +} + +/* + * 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; + memcpy(&skb->data[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. + */ + + +unsigned short wanrouter_type_trans(struct sk_buff *skb, struct net_device *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], 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 = *((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", + 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->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; + 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; + + 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; + } + 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 || conf->data_size < 0) { + 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 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 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; +#ifdef CONFIG_WANPIPE_MULTPPP + struct ppp_device *pppdev=NULL; +#endif + 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) { +#ifdef CONFIG_WANPIPE_MULTPPP + pppdev = kmalloc(sizeof(struct ppp_device), GFP_KERNEL); + err = -ENOBUFS; + if (pppdev == NULL) + goto out; + memset(pppdev, 0, sizeof(struct ppp_device)); + pppdev->dev = kmalloc(sizeof(struct net_device), GFP_KERNEL); + if (pppdev->dev == NULL) { + kfree(pppdev); + err = -ENOBUFS; + goto out; + } + memset(pppdev->dev, 0, sizeof(struct net_device)); + err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf); + dev = pppdev->dev; +#else + printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n", + wandev->name); + err = -EPROTONOSUPPORT; + goto out; +#endif + } else { + dev = kmalloc(sizeof(struct net_device), GFP_KERNEL); + err = -ENOBUFS; + if (dev == NULL) + goto out; + memset(dev, 0, sizeof(struct net_device)); + 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; + *((struct net_device **)slave->priv); + slave = *((struct net_device **)slave->priv)); + + *((struct net_device **)slave->priv) = dev; + } + ++wandev->ndev; + + unlock_adapter_irq(&wandev->lock, &smp_flags); + err = 0; /* done !!! */ + goto out; + } + } + 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 (cnf->config_id == WANCONFIG_MPPP) + kfree(pppdev); + else + kfree(dev); +#else + /* Sync PPP is disabled */ + if (cnf->config_id != WANCONFIG_MPPP) + kfree(dev); +#endif + +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 = dev->priv; + 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 = prev->priv; + struct net_device **slave = dev->priv; + + *prev_slave = *slave; + } else { + struct net_device **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); + + free_netdev(dev); + + return 0; +} + +void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) +{ + spin_lock_irqsave(lock, *smp_flags); +} + + +void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) +{ + spin_unlock_irqrestore(lock, *smp_flags); +} + +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); + +MODULE_LICENSE("GPL"); + +/* + * End + */ |