Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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
+ */