dev.c

GNU Mach 微内核源代码, 基于美国卡内基美隆大学的 Mach 研究项目

	 *
	 *	net_alias_dev_get(): dev_get() with added alias naming magic.
	 *	only allow alias creation/deletion if (getset==SIOCSIFADDR)
	 *
	 */
	 
#ifdef CONFIG_KERNELD
	dev_load(ifr.ifr_name);
#endif	

#ifdef CONFIG_NET_ALIAS
	if ((dev = net_alias_dev_get(ifr.ifr_name, getset == SIOCSIFADDR, &err, NULL, NULL)) == NULL)
		return(err);
#else
	if ((dev = dev_get(ifr.ifr_name)) == NULL) 	
		return(-ENODEV);
#endif
	switch(getset) 
	{
		case SIOCGIFFLAGS:	/* Get interface flags */
			ifr.ifr_flags = (dev->flags & ~IFF_SOFTHEADERS);
			goto rarok;

		case SIOCSIFFLAGS:	/* Set interface flags */
			{
				int old_flags = dev->flags;
				
				if(securelevel>0)
					ifr.ifr_flags&=~IFF_PROMISC;
				/*
				 *	We are not allowed to potentially close/unload
				 *	a device until we get this lock.
				 */
				
				dev_lock_wait();
				
				/*
				 *	Set the flags on our device.
				 */
				 
				dev->flags = (ifr.ifr_flags & (
					IFF_BROADCAST | IFF_DEBUG | IFF_LOOPBACK |
					IFF_POINTOPOINT | IFF_NOTRAILERS | IFF_RUNNING |
					IFF_NOARP | IFF_PROMISC | IFF_ALLMULTI | IFF_SLAVE | IFF_MASTER
					| IFF_MULTICAST)) | (dev->flags & (IFF_SOFTHEADERS|IFF_UP));
				/*
				 *	Load in the correct multicast list now the flags have changed.
				 */				

				dev_mc_upload(dev);

			  	/*
			  	 *	Have we downed the interface. We handle IFF_UP ourselves
			  	 *	according to user attempts to set it, rather than blindly
			  	 *	setting it.
			  	 */
			  	 
			  	if ((old_flags^ifr.ifr_flags)&IFF_UP)	/* Bit is different  ? */
			  	{
					if(old_flags&IFF_UP)		/* Gone down */
						ret=dev_close(dev); 		
					else				/* Come up */
					{
						ret=dev_open(dev);
						if(ret<0)
							dev->flags&=~IFF_UP;	/* Open failed */
					}	
			  	}
			  	else
			  		ret=0;
				/*
				 *	Load in the correct multicast list now the flags have changed.
				 */				

				dev_mc_upload(dev);
			}
			break;
		
		case SIOCGIFADDR:	/* Get interface address (and family) */
			if(ifr.ifr_addr.sa_family==AF_UNSPEC)
			{
				memcpy(ifr.ifr_hwaddr.sa_data,dev->dev_addr, MAX_ADDR_LEN);
				ifr.ifr_hwaddr.sa_family=dev->type;			
				goto rarok;
			}
			else
			{
				(*(struct sockaddr_in *)
					  &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr;
				(*(struct sockaddr_in *)
					  &ifr.ifr_addr).sin_family = dev->family;
				(*(struct sockaddr_in *)
					  &ifr.ifr_addr).sin_port = 0;
			}
			goto rarok;
	
		case SIOCSIFADDR:	/* Set interface address (and family) */
		
			/*
			 *	BSDism. SIOCSIFADDR family=AF_UNSPEC sets the
			 *	physical address. We can cope with this now.
			 */
			
			if(ifr.ifr_addr.sa_family==AF_UNSPEC)
			{
				if(dev->set_mac_address==NULL)
					return -EOPNOTSUPP;
				if(securelevel>0)
					return -EPERM;
				ret=dev->set_mac_address(dev,&ifr.ifr_addr);
			}
			else
			{
				u32 new_pa_addr = (*(struct sockaddr_in *)
					 &ifr.ifr_addr).sin_addr.s_addr;
				u16 new_family = ifr.ifr_addr.sa_family;

				if (new_family == dev->family &&
				    new_pa_addr == dev->pa_addr) {
					ret =0;
					break;
				}
				if (dev->flags & IFF_UP)
					notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);

				/*
				 *	if dev is an alias, must rehash to update
				 *	address change
				 */

#ifdef CONFIG_NET_ALIAS
			  	if (net_alias_is(dev))
				    	net_alias_dev_rehash(dev ,&ifr.ifr_addr);
#endif
				dev->pa_addr = new_pa_addr;
				dev->family = new_family;
			
#ifdef CONFIG_INET	
				/* This is naughty. When net-032e comes out It wants moving into the net032
				   code not the kernel. Till then it can sit here (SIGH) */		
				if (!dev->pa_mask)
					dev->pa_mask = ip_get_mask(dev->pa_addr);
#endif			
				if (!dev->pa_brdaddr)
					dev->pa_brdaddr = dev->pa_addr | ~dev->pa_mask;
				if (dev->flags & IFF_UP)
					notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
				ret = 0;
			}
			break;
			
		case SIOCGIFBRDADDR:	/* Get the broadcast address */
			(*(struct sockaddr_in *)
				&ifr.ifr_broadaddr).sin_addr.s_addr = dev->pa_brdaddr;
			(*(struct sockaddr_in *)
				&ifr.ifr_broadaddr).sin_family = dev->family;
			(*(struct sockaddr_in *)
				&ifr.ifr_broadaddr).sin_port = 0;
			goto rarok;

		case SIOCSIFBRDADDR:	/* Set the broadcast address */
			dev->pa_brdaddr = (*(struct sockaddr_in *)
				&ifr.ifr_broadaddr).sin_addr.s_addr;
			ret = 0;
			break;
			
		case SIOCGIFDSTADDR:	/* Get the destination address (for point-to-point links) */
			(*(struct sockaddr_in *)
				&ifr.ifr_dstaddr).sin_addr.s_addr = dev->pa_dstaddr;
			(*(struct sockaddr_in *)
				&ifr.ifr_dstaddr).sin_family = dev->family;
			(*(struct sockaddr_in *)
				&ifr.ifr_dstaddr).sin_port = 0;
			goto rarok;
	
		case SIOCSIFDSTADDR:	/* Set the destination address (for point-to-point links) */
			dev->pa_dstaddr = (*(struct sockaddr_in *)
				&ifr.ifr_dstaddr).sin_addr.s_addr;
			ret = 0;
			break;
			
		case SIOCGIFNETMASK:	/* Get the netmask for the interface */
			(*(struct sockaddr_in *)
				&ifr.ifr_netmask).sin_addr.s_addr = dev->pa_mask;
			(*(struct sockaddr_in *)
				&ifr.ifr_netmask).sin_family = dev->family;
			(*(struct sockaddr_in *)
				&ifr.ifr_netmask).sin_port = 0;
			goto rarok;

		case SIOCSIFNETMASK: 	/* Set the netmask for the interface */
			{
				unsigned long mask = (*(struct sockaddr_in *)
					&ifr.ifr_netmask).sin_addr.s_addr;
				ret = -EINVAL;
				/*
				 *	The mask we set must be legal.
				 */
				if (bad_mask(mask,0))
					break;
				dev->pa_mask = mask;
				ret = 0;
			}
			break;
			
		case SIOCGIFMETRIC:	/* Get the metric on the interface (currently unused) */
			
			ifr.ifr_metric = dev->metric;
			goto  rarok;
			
		case SIOCSIFMETRIC:	/* Set the metric on the interface (currently unused) */
			dev->metric = ifr.ifr_metric;
			ret=0;
			break;
	
		case SIOCGIFMTU:	/* Get the MTU of a device */
			ifr.ifr_mtu = dev->mtu;
			goto rarok;
	
		case SIOCSIFMTU:	/* Set the MTU of a device */
		
			if (dev->change_mtu)
				ret = dev->change_mtu(dev, ifr.ifr_mtu);
			else
			{
				/*
				 *	MTU must be positive.
				 */
			 
				if(ifr.ifr_mtu<68)
					return -EINVAL;

				dev->mtu = ifr.ifr_mtu;
				ret = 0;
			}
			break;
	
		case SIOCGIFMEM:	/* Get the per device memory space. We can add this but currently
					   do not support it */
			ret = -EINVAL;
			break;
		
		case SIOCSIFMEM:	/* Set the per device memory buffer space. Not applicable in our case */
			ret = -EINVAL;
			break;

		case SIOCGIFHWADDR:
			memcpy(ifr.ifr_hwaddr.sa_data,dev->dev_addr, MAX_ADDR_LEN);
			ifr.ifr_hwaddr.sa_family=dev->type;			
			goto rarok;
				
		case SIOCSIFHWADDR:
			if(dev->set_mac_address==NULL)
				return -EOPNOTSUPP;
			if(securelevel > 0)
				return -EPERM;
			if(ifr.ifr_hwaddr.sa_family!=dev->type)
				return -EINVAL;
			ret=dev->set_mac_address(dev,&ifr.ifr_hwaddr);
			break;
			
		case SIOCGIFMAP:
			ifr.ifr_map.mem_start=dev->mem_start;
			ifr.ifr_map.mem_end=dev->mem_end;
			ifr.ifr_map.base_addr=dev->base_addr;
			ifr.ifr_map.irq=dev->irq;
			ifr.ifr_map.dma=dev->dma;
			ifr.ifr_map.port=dev->if_port;
			goto rarok;
			
		case SIOCSIFMAP:
			if(dev->set_config==NULL)
				return -EOPNOTSUPP;
			return dev->set_config(dev,&ifr.ifr_map);
			
		case SIOCADDMULTI:
			if(dev->set_multicast_list==NULL)
				return -EINVAL;
			if(ifr.ifr_hwaddr.sa_family!=AF_UNSPEC)
				return -EINVAL;
			dev_mc_add(dev,ifr.ifr_hwaddr.sa_data, dev->addr_len, 1);
			return 0;

		case SIOCDELMULTI:
			if(dev->set_multicast_list==NULL)
				return -EINVAL;
			if(ifr.ifr_hwaddr.sa_family!=AF_UNSPEC)
				return -EINVAL;
			dev_mc_delete(dev,ifr.ifr_hwaddr.sa_data,dev->addr_len, 1);
			return 0;
		/*
		 *	Unknown or private ioctl
		 */

		default:
			if((getset >= SIOCDEVPRIVATE) &&
			   (getset <= (SIOCDEVPRIVATE + 15))) {
				if(dev->do_ioctl==NULL)
					return -EOPNOTSUPP;
				ret=dev->do_ioctl(dev, &ifr, getset);
				memcpy_tofs(arg,&ifr,sizeof(struct ifreq));
				break;
			}

#ifdef CONFIG_NET_RADIO
			if((getset >= SIOCIWFIRST) &&
			   (getset <= SIOCIWLAST))
			{
				if(dev->do_ioctl==NULL)
					return -EOPNOTSUPP;
				/* Perform the ioctl */
				ret=dev->do_ioctl(dev, &ifr, getset);
				/* If return args... */
				if(IW_IS_GET(getset))
					memcpy_tofs(arg, &ifr,
						    sizeof(struct ifreq));
				break;
			}
#endif	/* CONFIG_NET_RADIO */

			ret = -EINVAL;
	}
	return(ret);
/*
 *	The load of calls that return an ifreq and ok (saves memory).
 */
rarok:
	memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
	return 0;
}


/*
 *	This function handles all "interface"-type I/O control requests. The actual
 *	'doing' part of this is dev_ifsioc above.
 */

int dev_ioctl(unsigned int cmd, void *arg)
{
	switch(cmd) 
	{
		case SIOCGIFCONF:
			(void) dev_ifconf((char *) arg);
			return 0;

		/*
		 *	Ioctl calls that can be done by all.
		 */
		 
		case SIOCGIFFLAGS:
		case SIOCGIFADDR:
		case SIOCGIFDSTADDR:
		case SIOCGIFBRDADDR:
		case SIOCGIFNETMASK:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFMEM:
		case SIOCGIFHWADDR:
		case SIOCGIFSLAVE:
		case SIOCGIFMAP:
			return dev_ifsioc(arg, cmd);

		/*
		 *	Ioctl calls requiring the power of a superuser
		 */
		 
		case SIOCSIFFLAGS:
		case SIOCSIFADDR:
		case SIOCSIFDSTADDR:
		case SIOCSIFBRDADDR:
		case SIOCSIFNETMASK:
		case SIOCSIFMETRIC:
		case SIOCSIFMTU:
		case SIOCSIFMEM:
		case SIOCSIFHWADDR:
		case SIOCSIFMAP:
		case SIOCSIFSLAVE:
		case SIOCADDMULTI:
		case SIOCDELMULTI:
			if (!suser())
				return -EPERM;
			return dev_ifsioc(arg, cmd);
	
		case SIOCSIFLINK:
			return -EINVAL;

		/*
		 *	Unknown or private ioctl.
		 */	
		 
		default:
			if((cmd >= SIOCDEVPRIVATE) &&
			   (cmd <= (SIOCDEVPRIVATE + 15))) {
				return dev_ifsioc(arg, cmd);
			}
#ifdef CONFIG_NET_RADIO
			if((cmd >= SIOCIWFIRST) &&
			   (cmd <= SIOCIWLAST))
			{
				if((IW_IS_SET(cmd)) && (!suser()))
					return -EPERM;
				return dev_ifsioc(arg, cmd);
			}
#endif	/* CONFIG_NET_RADIO */
			return -EINVAL;
	}
}


/*
 *	Initialize the DEV module. At boot time this walks the device list and
 *	unhooks any devices that fail to initialise (normally hardware not 
 *	present) and leaves us with a valid list of present and active devices.
 *
 */
extern int lance_init(void);
extern int pi_init(void);
extern int pt_init(void);
extern int bpq_init(void);
extern void sdla_setup(void);
extern int dlci_setup(void);
extern int sm_init(void);
extern int baycom_init(void);

int net_dev_init(void)
{
	struct device *dev, **dp;

	/*
	 *	Initialise the packet receive queue.
	 */
	 
	skb_queue_head_init(&backlog);
	
	/*
	 *	The bridge has to be up before the devices
	 */

#ifdef CONFIG_BRIDGE	 
	br_init();
#endif	
	
	/*
	 * This is Very Ugly(tm).
	 *
	 * Some devices want to be initialized early..
	 */
#if defined(CONFIG_PI)
	pi_init();
#endif	
#if defined(CONFIG_PT)
	pt_init();
#endif
#if defined(CONFIG_BPQETHER)
	bpq_init();
#endif
#if defined(CONFIG_DLCI)
	dlci_setup();
#endif
#if defined(CONFIG_SDLA)
	sdla_setup();
#endif
#if defined(CONFIG_BAYCOM)
        baycom_init();
#endif
#if defined(CONFIG_SOUNDMODEM)
        sm_init();
#endif
	/*
	 *	SLHC if present needs attaching so other people see it
	 *	even if not opened.
	 */
#if (defined(CONFIG_SLIP) && defined(CONFIG_SLIP_COMPRESSED)) \
	 || defined(CONFIG_PPP) \
    || (defined(CONFIG_ISDN) && defined(CONFIG_ISDN_PPP))
	slhc_install();
#endif	

	/*
	 *	Add the devices.
	 *	If the call to dev->init fails, the dev is removed
	 *	from the chain disconnecting the device until the
	 *	next reboot.
	 */

	dp = &dev_base;
	while ((dev = *dp) != NULL)
	{
		int i;
		for (i = 0; i < DEV_NUMBUFFS; i++)  {
			skb_queue_head_init(dev->buffs + i);
		}

		if (dev->init && dev->init(dev)) 
		{
			/*
			 *	It failed to come up. Unhook it.
			 */
			*dp = dev->next;
		} 
		else
		{
			dp = &dev->next;
		}
	}

#ifdef CONFIG_PROC_FS
	proc_net_register(&(struct proc_dir_entry) {
		PROC_NET_DEV, 3, "dev",
		S_IFREG | S_IRUGO, 1, 0, 0,
		0, &proc_net_inode_operations,
		dev_get_info
	});
#endif

#ifdef CONFIG_NET_RADIO
#ifdef CONFIG_PROC_FS
	proc_net_register(&(struct proc_dir_entry) {
		PROC_NET_WIRELESS, 8, "wireless",
		S_IFREG | S_IRUGO, 1, 0, 0,
		0, &proc_net_inode_operations,
		dev_get_wireless_info
	});
#endif	/* CONFIG_PROC_FS */
#endif	/* CONFIG_NET_RADIO */

	/*	
	 *	Initialise net_alias engine 
	 *
	 *		- register net_alias device notifier
	 *		- register proc entries:	/proc/net/alias_types
	 *									/proc/net/aliases
	 */

#ifdef CONFIG_NET_ALIAS
	net_alias_init();
#endif

	init_bh(NET_BH, net_bh);
	return 0;
}