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Commit bf742482 authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[NET]: dev: introduce generic net_device address lists 



Introduce struct dev_addr_list and list maintenance functions
based on dev_mc_list and the related functions. This will be
used by follow-up patches for both multicast and secondary
unicast addresses.

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 75ebe8f7

include/linux/netdevice.h

+11 −0
Original line number Diff line number Diff line
@@ -177,6 +177,14 @@ struct netif_rx_stats 


DECLARE_PER_CPU(struct netif_rx_stats, netdev_rx_stat);



struct dev_addr_list

{

	struct dev_addr_list	*next;

	u8			da_addr[MAX_ADDR_LEN];

	u8			da_addrlen;

	int			da_users;

	int			da_gusers;

};



/*

 *	We tag multicasts with these structures.
@@ -1008,6 +1016,9 @@ extern void dev_mc_upload(struct net_device *dev); 
extern int 		dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);

extern int		dev_mc_add(struct net_device *dev, void *addr, int alen, int newonly);

extern void		dev_mc_discard(struct net_device *dev);

extern int 		__dev_addr_delete(struct dev_addr_list **list, void *addr, int alen, int all);

extern int		__dev_addr_add(struct dev_addr_list **list, void *addr, int alen, int newonly);

extern void		__dev_addr_discard(struct dev_addr_list **list);

extern void		dev_set_promiscuity(struct net_device *dev, int inc);

extern void		dev_set_allmulti(struct net_device *dev, int inc);

extern void		netdev_state_change(struct net_device *dev);

net/core/dev.c

+69 −0
Original line number Diff line number Diff line
@@ -2553,6 +2553,75 @@ void dev_set_allmulti(struct net_device *dev, int inc) 
		dev_mc_upload(dev);

}



int __dev_addr_delete(struct dev_addr_list **list, void *addr, int alen,

		      int glbl)

{

	struct dev_addr_list *da;



	for (; (da = *list) != NULL; list = &da->next) {

		if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&

		    alen == da->da_addrlen) {

			if (glbl) {

				int old_glbl = da->da_gusers;

				da->da_gusers = 0;

				if (old_glbl == 0)

					break;

			}

			if (--da->da_users)

				return 0;



			*list = da->next;

			kfree(da);

			return 0;

		}

	}

	return -ENOENT;

}



int __dev_addr_add(struct dev_addr_list **list, void *addr, int alen, int glbl)

{

	struct dev_addr_list *da;



	for (da = *list; da != NULL; da = da->next) {

		if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&

		    da->da_addrlen == alen) {

			if (glbl) {

				int old_glbl = da->da_gusers;

				da->da_gusers = 1;

				if (old_glbl)

					return 0;

			}

			da->da_users++;

			return 0;

		}

	}



	da = kmalloc(sizeof(*da), GFP_ATOMIC);

	if (da == NULL)

		return -ENOMEM;

	memcpy(da->da_addr, addr, alen);

	da->da_addrlen = alen;

	da->da_users = 1;

	da->da_gusers = glbl ? 1 : 0;

	da->next = *list;

	*list = da;

	return 0;

}



void __dev_addr_discard(struct dev_addr_list **list)

{

	struct dev_addr_list *tmp;



	while (*list != NULL) {

		tmp = *list;

		*list = tmp->next;

		if (tmp->da_users > tmp->da_gusers)

			printk("__dev_addr_discard: address leakage! "

			       "da_users=%d\n", tmp->da_users);

		kfree(tmp);

	}

}



unsigned dev_get_flags(const struct net_device *dev)

{

	unsigned flags;