net_kern.c

linux-2.6.15.6

	if(*str != '='){
		printk(KERN_ERR 
		       "eth_setup: expected '=' after device number\n");
		return(1);
	}
	str++;
	if(find_device(n)){
		printk(KERN_ERR "eth_setup: Device %d already configured\n",
		       n);
		return(1);
	}
	if(index_out) *index_out = n;
	*str_out = str;
	return(0);
}

struct eth_init {
	struct list_head list;
	char *init;
	int index;
};

/* Filled in at boot time.  Will need locking if the transports become
 * modular.
 */
struct list_head transports = LIST_HEAD_INIT(transports);

/* Filled in during early boot */
struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);

static int check_transport(struct transport *transport, char *eth, int n,
			   void **init_out, char **mac_out)
{
	int len;

	len = strlen(transport->name);
	if(strncmp(eth, transport->name, len))
		return(0);

	eth += len;
	if(*eth == ',')
		eth++;
	else if(*eth != '\0')
		return(0);

	*init_out = kmalloc(transport->setup_size, GFP_KERNEL);
	if(*init_out == NULL)
		return(1);

	if(!transport->setup(eth, mac_out, *init_out)){
		kfree(*init_out);
		*init_out = NULL;
	}
	return(1);
}

void register_transport(struct transport *new)
{
	struct list_head *ele, *next;
	struct eth_init *eth;
	void *init;
	char *mac = NULL;
	int match;

	list_add(&new->list, &transports);

	list_for_each_safe(ele, next, &eth_cmd_line){
		eth = list_entry(ele, struct eth_init, list);
		match = check_transport(new, eth->init, eth->index, &init,
					&mac);
		if(!match)
			continue;
		else if(init != NULL){
			eth_configure(eth->index, init, mac, new);
			kfree(init);
		}
		list_del(&eth->list);
	}
}

static int eth_setup_common(char *str, int index)
{
	struct list_head *ele;
	struct transport *transport;
	void *init;
	char *mac = NULL;

	list_for_each(ele, &transports){
		transport = list_entry(ele, struct transport, list);
	        if(!check_transport(transport, str, index, &init, &mac))
			continue;
		if(init != NULL){
			eth_configure(index, init, mac, transport);
			kfree(init);
		}
		return(1);
	}
	return(0);
}

static int eth_setup(char *str)
{
	struct eth_init *new;
	int n, err;

	err = eth_parse(str, &n, &str);
	if(err) return(1);

	new = alloc_bootmem(sizeof(new));
	if (new == NULL){
		printk("eth_init : alloc_bootmem failed\n");
		return(1);
	}

	INIT_LIST_HEAD(&new->list);
	new->index = n;
	new->init = str;

	list_add_tail(&new->list, &eth_cmd_line);
	return(1);
}

__setup("eth", eth_setup);
__uml_help(eth_setup,
"eth[0-9]+=<transport>,<options>\n"
"    Configure a network device.\n\n"
);

#if 0
static int eth_init(void)
{
	struct list_head *ele, *next;
	struct eth_init *eth;

	list_for_each_safe(ele, next, &eth_cmd_line){
		eth = list_entry(ele, struct eth_init, list);

		if(eth_setup_common(eth->init, eth->index))
			list_del(&eth->list);
	}
	
	return(1);
}
__initcall(eth_init);
#endif

static int net_config(char *str)
{
	int n, err;

	err = eth_parse(str, &n, &str);
	if(err) return(err);

	str = uml_strdup(str);
	if(str == NULL){
		printk(KERN_ERR "net_config failed to strdup string\n");
		return(-1);
	}
	err = !eth_setup_common(str, n);
	if(err) 
		kfree(str);
	return(err);
}

static int net_id(char **str, int *start_out, int *end_out)
{
        char *end;
        int n;

	n = simple_strtoul(*str, &end, 0);
	if((*end != '\0') || (end == *str))
		return -1;

        *start_out = n;
        *end_out = n;
        *str = end;
        return n;
}

static int net_remove(int n)
{
	struct uml_net *device;
	struct net_device *dev;
	struct uml_net_private *lp;

	device = find_device(n);
	if(device == NULL)
		return -ENODEV;

	dev = device->dev;
	lp = dev->priv;
	if(lp->fd > 0)
                return -EBUSY;
	if(lp->remove != NULL) (*lp->remove)(&lp->user);
	unregister_netdev(dev);
	platform_device_unregister(&device->pdev);

	list_del(&device->list);
	kfree(device);
	free_netdev(dev);
	return 0;
}

static struct mc_device net_mc = {
	.name		= "eth",
	.config		= net_config,
	.get_config	= NULL,
        .id		= net_id,
	.remove		= net_remove,
};

static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
			      void *ptr)
{
	struct in_ifaddr *ifa = ptr;
	struct net_device *dev = ifa->ifa_dev->dev;
	struct uml_net_private *lp;
	void (*proc)(unsigned char *, unsigned char *, void *);
	unsigned char addr_buf[4], netmask_buf[4];

	if(dev->open != uml_net_open) return(NOTIFY_DONE);

	lp = dev->priv;

	proc = NULL;
	switch (event){
	case NETDEV_UP:
		proc = lp->add_address;
		break;
	case NETDEV_DOWN:
		proc = lp->delete_address;
		break;
	}
	if(proc != NULL){
		memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
		memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
		(*proc)(addr_buf, netmask_buf, &lp->user);
	}
	return(NOTIFY_DONE);
}

struct notifier_block uml_inetaddr_notifier = {
	.notifier_call		= uml_inetaddr_event,
};

static int uml_net_init(void)
{
	struct list_head *ele;
	struct uml_net_private *lp;	
	struct in_device *ip;
	struct in_ifaddr *in;

	mconsole_register_dev(&net_mc);
	register_inetaddr_notifier(&uml_inetaddr_notifier);

	/* Devices may have been opened already, so the uml_inetaddr_notifier
	 * didn't get a chance to run for them.  This fakes it so that
	 * addresses which have already been set up get handled properly.
	 */
	list_for_each(ele, &opened){
		lp = list_entry(ele, struct uml_net_private, list);
		ip = lp->dev->ip_ptr;
		if(ip == NULL) continue;
		in = ip->ifa_list;
		while(in != NULL){
			uml_inetaddr_event(NULL, NETDEV_UP, in);
			in = in->ifa_next;
		}
	}	

	return(0);
}

__initcall(uml_net_init);

static void close_devices(void)
{
	struct list_head *ele;
	struct uml_net_private *lp;

	list_for_each(ele, &opened){
		lp = list_entry(ele, struct uml_net_private, list);
		if((lp->close != NULL) && (lp->fd >= 0))
			(*lp->close)(lp->fd, &lp->user);
		if(lp->remove != NULL) (*lp->remove)(&lp->user);
	}
}

__uml_exitcall(close_devices);

int setup_etheraddr(char *str, unsigned char *addr)
{
	char *end;
	int i;

	if(str == NULL)
		return(0);
	for(i=0;i<6;i++){
		addr[i] = simple_strtoul(str, &end, 16);
		if((end == str) ||
		   ((*end != ':') && (*end != ',') && (*end != '\0'))){
			printk(KERN_ERR 
			       "setup_etheraddr: failed to parse '%s' "
			       "as an ethernet address\n", str);
			return(0);
		}
		str = end + 1;
	}
	if(addr[0] & 1){
		printk(KERN_ERR 
		       "Attempt to assign a broadcast ethernet address to a "
		       "device disallowed\n");
		return(0);
	}
	return(1);
}

void dev_ip_addr(void *d, unsigned char *bin_buf)
{
	struct net_device *dev = d;
	struct in_device *ip = dev->ip_ptr;
	struct in_ifaddr *in;

	if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
		printk(KERN_WARNING "dev_ip_addr - device not assigned an "
		       "IP address\n");
		return;
	}
	memcpy(bin_buf, &in->ifa_address, sizeof(in->ifa_address));
}

void set_ether_mac(void *d, unsigned char *addr)
{
	struct net_device *dev = d;

	memcpy(dev->dev_addr, addr, ETH_ALEN);	
}

struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
{
	if((skb != NULL) && (skb_tailroom(skb) < extra)){
	  	struct sk_buff *skb2;

		skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
		dev_kfree_skb(skb);
		skb = skb2;
	}
	if(skb != NULL) skb_put(skb, extra);
	return(skb);
}

void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 
					void *), 
		    void *arg)
{
	struct net_device *dev = d;
	struct in_device *ip = dev->ip_ptr;
	struct in_ifaddr *in;
	unsigned char address[4], netmask[4];

	if(ip == NULL) return;
	in = ip->ifa_list;
	while(in != NULL){
		memcpy(address, &in->ifa_address, sizeof(address));
		memcpy(netmask, &in->ifa_mask, sizeof(netmask));
		(*cb)(address, netmask, arg);
		in = in->ifa_next;
	}
}

int dev_netmask(void *d, void *m)
{
	struct net_device *dev = d;
	struct in_device *ip = dev->ip_ptr;
	struct in_ifaddr *in;
	__u32 *mask_out = m;

	if(ip == NULL) 
		return(1);

	in = ip->ifa_list;
	if(in == NULL) 
		return(1);

	*mask_out = in->ifa_mask;
	return(0);
}

void *get_output_buffer(int *len_out)
{
	void *ret;

	ret = (void *) __get_free_pages(GFP_KERNEL, 0);
	if(ret) *len_out = PAGE_SIZE;
	else *len_out = 0;
	return(ret);
}

void free_output_buffer(void *buffer)
{
	free_pages((unsigned long) buffer, 0);
}

int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 
		     char **gate_addr)
{
	char *remain;

	remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
	if(remain != NULL){
		printk("tap_setup_common - Extra garbage on specification : "
		       "'%s'\n", remain);
		return(1);
	}

	return(0);
}

unsigned short eth_protocol(struct sk_buff *skb)
{
	return(eth_type_trans(skb, skb->dev));
}

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */