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