/***************************************************************************** * 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 #include #include /* offsetof(), etc. */ #include /* return codes */ #include #include /* support for loadable modules */ #include /* kmalloc(), kfree() */ #include /* verify_area(), etc. */ #include /* inline mem*, str* functions */ #include /* htons(), etc. */ #include /* WAN router API definitions */ #if defined(LINUX_2_4) #include /* vmalloc, vfree */ #include /* copy_to/from_user */ #include /* __initfunc et al. */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,3) #include #else #include <../drivers/net/wan/syncppp.h> #endif #elif defined(LINUX_2_1) #define LINUX_2_1 #include /* vmalloc, vfree */ #include /* copy_to/from_user */ #include /* __initfunc et al. */ #include <../drivers/net/syncppp.h> #else #include /* 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 */