[net-next-2.6.git] / include / linux / inetdevice.h

#ifndef _LINUX_INETDEVICE_H
#define _LINUX_INETDEVICE_H

#ifdef __KERNEL__

#include <linux/bitmap.h>
#include <linux/if.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
#include <linux/timer.h>
#include <linux/sysctl.h>
#include <linux/rtnetlink.h>

enum
{
	IPV4_DEVCONF_FORWARDING=1,
	IPV4_DEVCONF_MC_FORWARDING,
	IPV4_DEVCONF_PROXY_ARP,
	IPV4_DEVCONF_ACCEPT_REDIRECTS,
	IPV4_DEVCONF_SECURE_REDIRECTS,
	IPV4_DEVCONF_SEND_REDIRECTS,
	IPV4_DEVCONF_SHARED_MEDIA,
	IPV4_DEVCONF_RP_FILTER,
	IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,
	IPV4_DEVCONF_BOOTP_RELAY,
	IPV4_DEVCONF_LOG_MARTIANS,
	IPV4_DEVCONF_TAG,
	IPV4_DEVCONF_ARPFILTER,
	IPV4_DEVCONF_MEDIUM_ID,
	IPV4_DEVCONF_NOXFRM,
	IPV4_DEVCONF_NOPOLICY,
	IPV4_DEVCONF_FORCE_IGMP_VERSION,
	IPV4_DEVCONF_ARP_ANNOUNCE,
	IPV4_DEVCONF_ARP_IGNORE,
	IPV4_DEVCONF_PROMOTE_SECONDARIES,
	IPV4_DEVCONF_ARP_ACCEPT,
	IPV4_DEVCONF_ARP_NOTIFY,
	IPV4_DEVCONF_ACCEPT_LOCAL,
	IPV4_DEVCONF_SRC_VMARK,
	IPV4_DEVCONF_PROXY_ARP_PVLAN,
	__IPV4_DEVCONF_MAX
};

#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)

struct ipv4_devconf {
	void	*sysctl;
	int	data[IPV4_DEVCONF_MAX];
	DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
};

struct in_device {
	struct net_device	*dev;
	atomic_t		refcnt;
	int			dead;
	struct in_ifaddr	*ifa_list;	/* IP ifaddr chain		*/
	struct ip_mc_list __rcu	*mc_list;	/* IP multicast filter chain    */
	int			mc_count;	/* Number of installed mcasts	*/
	spinlock_t		mc_tomb_lock;
	struct ip_mc_list	*mc_tomb;
	unsigned long		mr_v1_seen;
	unsigned long		mr_v2_seen;
	unsigned long		mr_maxdelay;
	unsigned char		mr_qrv;
	unsigned char		mr_gq_running;
	unsigned char		mr_ifc_count;
	struct timer_list	mr_gq_timer;	/* general query timer */
	struct timer_list	mr_ifc_timer;	/* interface change timer */

	struct neigh_parms	*arp_parms;
	struct ipv4_devconf	cnf;
	struct rcu_head		rcu_head;
};

#define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
#define IPV4_DEVCONF_ALL(net, attr) \
	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)

static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
{
	index--;
	return in_dev->cnf.data[index];
}

static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
				    int val)
{
	index--;
	set_bit(index, in_dev->cnf.state);
	in_dev->cnf.data[index] = val;
}

static inline void ipv4_devconf_setall(struct in_device *in_dev)
{
	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
}

#define IN_DEV_CONF_GET(in_dev, attr) \
	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
#define IN_DEV_CONF_SET(in_dev, attr, val) \
	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))

#define IN_DEV_ANDCONF(in_dev, attr) \
	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
	 IN_DEV_CONF_GET((in_dev), attr))
#define IN_DEV_ORCONF(in_dev, attr) \
	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) || \
	 IN_DEV_CONF_GET((in_dev), attr))
#define IN_DEV_MAXCONF(in_dev, attr) \
	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
	     IN_DEV_CONF_GET((in_dev), attr)))

#define IN_DEV_FORWARD(in_dev)		IN_DEV_CONF_GET((in_dev), FORWARDING)
#define IN_DEV_MFORWARD(in_dev)		IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
#define IN_DEV_RPFILTER(in_dev)		IN_DEV_MAXCONF((in_dev), RP_FILTER)
#define IN_DEV_SRC_VMARK(in_dev)    	IN_DEV_ORCONF((in_dev), SRC_VMARK)
#define IN_DEV_SOURCE_ROUTE(in_dev)	IN_DEV_ANDCONF((in_dev), \
						       ACCEPT_SOURCE_ROUTE)
#define IN_DEV_ACCEPT_LOCAL(in_dev)	IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
#define IN_DEV_BOOTP_RELAY(in_dev)	IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)

#define IN_DEV_LOG_MARTIANS(in_dev)	IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
#define IN_DEV_PROXY_ARP(in_dev)	IN_DEV_ORCONF((in_dev), PROXY_ARP)
#define IN_DEV_PROXY_ARP_PVLAN(in_dev)	IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
#define IN_DEV_SHARED_MEDIA(in_dev)	IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
#define IN_DEV_TX_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
#define IN_DEV_SEC_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), \
						      SECURE_REDIRECTS)
#define IN_DEV_IDTAG(in_dev)		IN_DEV_CONF_GET(in_dev, TAG)
#define IN_DEV_MEDIUM_ID(in_dev)	IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
#define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
					IN_DEV_ORCONF((in_dev), \
						      PROMOTE_SECONDARIES)

#define IN_DEV_RX_REDIRECTS(in_dev) \
	((IN_DEV_FORWARD(in_dev) && \
	  IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
	 || (!IN_DEV_FORWARD(in_dev) && \
	  IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))

#define IN_DEV_ARPFILTER(in_dev)	IN_DEV_ORCONF((in_dev), ARPFILTER)
#define IN_DEV_ARP_ANNOUNCE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
#define IN_DEV_ARP_IGNORE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
#define IN_DEV_ARP_NOTIFY(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)

struct in_ifaddr {
	struct in_ifaddr	*ifa_next;
	struct in_device	*ifa_dev;
	struct rcu_head		rcu_head;
	__be32			ifa_local;
	__be32			ifa_address;
	__be32			ifa_mask;
	__be32			ifa_broadcast;
	unsigned char		ifa_scope;
	unsigned char		ifa_flags;
	unsigned char		ifa_prefixlen;
	char			ifa_label[IFNAMSIZ];
};

extern int register_inetaddr_notifier(struct notifier_block *nb);
extern int unregister_inetaddr_notifier(struct notifier_block *nb);

extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
{
	return __ip_dev_find(net, addr, true);
}

extern int		inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
extern int		devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
extern void		devinet_init(void);
extern struct in_device	*inetdev_by_index(struct net *, int);
extern __be32		inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
extern __be32		inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);

static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
{
	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
}

/*
 *	Check if a mask is acceptable.
 */
 
static __inline__ int bad_mask(__be32 mask, __be32 addr)
{
	__u32 hmask;
	if (addr & (mask = ~mask))
		return 1;
	hmask = ntohl(mask);
	if (hmask & (hmask+1))
		return 1;
	return 0;
}

#define for_primary_ifa(in_dev)	{ struct in_ifaddr *ifa; \
  for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)

#define for_ifa(in_dev)	{ struct in_ifaddr *ifa; \
  for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)


#define endfor_ifa(in_dev) }

static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
{
	return rcu_dereference(dev->ip_ptr);
}

static inline struct in_device *in_dev_get(const struct net_device *dev)
{
	struct in_device *in_dev;

	rcu_read_lock();
	in_dev = __in_dev_get_rcu(dev);
	if (in_dev)
		atomic_inc(&in_dev->refcnt);
	rcu_read_unlock();
	return in_dev;
}

static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
{
	return rcu_dereference_check(dev->ip_ptr, lockdep_rtnl_is_held());
}

extern void in_dev_finish_destroy(struct in_device *idev);

static inline void in_dev_put(struct in_device *idev)
{
	if (atomic_dec_and_test(&idev->refcnt))
		in_dev_finish_destroy(idev);
}

#define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
#define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)

#endif /* __KERNEL__ */

static __inline__ __be32 inet_make_mask(int logmask)
{
	if (logmask)
		return htonl(~((1<<(32-logmask))-1));
	return 0;
}

static __inline__ int inet_mask_len(__be32 mask)
{
	__u32 hmask = ntohl(mask);
	if (!hmask)
		return 0;
	return 32 - ffz(~hmask);
}


#endif /* _LINUX_INETDEVICE_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_INETDEVICE_H
	2	#define _LINUX_INETDEVICE_H
	3
	4	#ifdef __KERNEL__
	5
31be3085	6	#include <linux/bitmap.h>
1da177e4 LT	7	#include <linux/if.h>
	8	#include <linux/netdevice.h>
	9	#include <linux/rcupdate.h>
	10	#include <linux/timer.h>
8bfe6d68	11	#include <linux/sysctl.h>
95ae6b22	12	#include <linux/rtnetlink.h>
1da177e4	13
02291680 EB	14	enum
	15	{
	16	IPV4_DEVCONF_FORWARDING=1,
	17	IPV4_DEVCONF_MC_FORWARDING,
	18	IPV4_DEVCONF_PROXY_ARP,
	19	IPV4_DEVCONF_ACCEPT_REDIRECTS,
	20	IPV4_DEVCONF_SECURE_REDIRECTS,
	21	IPV4_DEVCONF_SEND_REDIRECTS,
	22	IPV4_DEVCONF_SHARED_MEDIA,
	23	IPV4_DEVCONF_RP_FILTER,
	24	IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,
	25	IPV4_DEVCONF_BOOTP_RELAY,
	26	IPV4_DEVCONF_LOG_MARTIANS,
	27	IPV4_DEVCONF_TAG,
	28	IPV4_DEVCONF_ARPFILTER,
	29	IPV4_DEVCONF_MEDIUM_ID,
	30	IPV4_DEVCONF_NOXFRM,
	31	IPV4_DEVCONF_NOPOLICY,
	32	IPV4_DEVCONF_FORCE_IGMP_VERSION,
	33	IPV4_DEVCONF_ARP_ANNOUNCE,
	34	IPV4_DEVCONF_ARP_IGNORE,
	35	IPV4_DEVCONF_PROMOTE_SECONDARIES,
	36	IPV4_DEVCONF_ARP_ACCEPT,
	37	IPV4_DEVCONF_ARP_NOTIFY,
	38	IPV4_DEVCONF_ACCEPT_LOCAL,
	39	IPV4_DEVCONF_SRC_VMARK,
	40	IPV4_DEVCONF_PROXY_ARP_PVLAN,
	41	__IPV4_DEVCONF_MAX
	42	};
	43
ca7479eb TG	44	#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
ca7479eb TG	45
d94d9fee	46	struct ipv4_devconf {
1da177e4	47	void *sysctl;
ca7479eb TG	48	int data[IPV4_DEVCONF_MAX];
ca7479eb TG	49	DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
1da177e4 LT	50	};
1da177e4 LT	51
d94d9fee	52	struct in_device {
1da177e4 LT	53	struct net_device *dev;
	54	atomic_t refcnt;
	55	int dead;
	56	struct in_ifaddr ifa_list; / IP ifaddr chain */
1d7138de ED	57	struct ip_mc_list __rcu mc_list; / IP multicast filter chain */
1d7138de ED	58	int mc_count; /* Number of installed mcasts */
1da177e4 LT	59	spinlock_t mc_tomb_lock;
	60	struct ip_mc_list *mc_tomb;
	61	unsigned long mr_v1_seen;
	62	unsigned long mr_v2_seen;
	63	unsigned long mr_maxdelay;
	64	unsigned char mr_qrv;
	65	unsigned char mr_gq_running;
	66	unsigned char mr_ifc_count;
	67	struct timer_list mr_gq_timer; /* general query timer */
	68	struct timer_list mr_ifc_timer; /* interface change timer */
	69
	70	struct neigh_parms *arp_parms;
	71	struct ipv4_devconf cnf;
	72	struct rcu_head rcu_head;
	73	};
	74
02291680	75	#define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
586f1211 PE	76	#define IPV4_DEVCONF_ALL(net, attr) \
586f1211 PE	77	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
42f811b8 HX	78
	79	static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
	80	{
	81	index--;
	82	return in_dev->cnf.data[index];
	83	}
	84
	85	static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
	86	int val)
	87	{
	88	index--;
31be3085	89	set_bit(index, in_dev->cnf.state);
42f811b8 HX	90	in_dev->cnf.data[index] = val;
	91	}
	92
71e27da9 HX	93	static inline void ipv4_devconf_setall(struct in_device *in_dev)
71e27da9 HX	94	{
ca7479eb	95	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
71e27da9 HX	96	}
71e27da9 HX	97
42f811b8	98	#define IN_DEV_CONF_GET(in_dev, attr) \
02291680	99	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
42f811b8	100	#define IN_DEV_CONF_SET(in_dev, attr, val) \
02291680	101	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
42f811b8 HX	102
42f811b8 HX	103	#define IN_DEV_ANDCONF(in_dev, attr) \
c346dca1	104	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
586f1211	105	IN_DEV_CONF_GET((in_dev), attr))
42f811b8	106	#define IN_DEV_ORCONF(in_dev, attr) \
c346dca1	107	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) \|\| \
586f1211	108	IN_DEV_CONF_GET((in_dev), attr))
42f811b8	109	#define IN_DEV_MAXCONF(in_dev, attr) \
c346dca1	110	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
586f1211	111	IN_DEV_CONF_GET((in_dev), attr)))
42f811b8 HX	112
42f811b8 HX	113	#define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING)
01ecfe9b	114	#define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
27fed417	115	#define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER)
28f6aeea	116	#define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK)
42f811b8 HX	117	#define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \
42f811b8 HX	118	ACCEPT_SOURCE_ROUTE)
8153a10c	119	#define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
42f811b8 HX	120	#define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
	121
	122	#define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
	123	#define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP)
65324144	124	#define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
42f811b8 HX	125	#define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
	126	#define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
	127	#define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \
	128	SECURE_REDIRECTS)
	129	#define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG)
	130	#define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
	131	#define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
	132	IN_DEV_ORCONF((in_dev), \
	133	PROMOTE_SECONDARIES)
1da177e4 LT	134
	135	#define IN_DEV_RX_REDIRECTS(in_dev) \
	136	((IN_DEV_FORWARD(in_dev) && \
42f811b8	137	IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
1da177e4	138	\|\| (!IN_DEV_FORWARD(in_dev) && \
42f811b8	139	IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
1da177e4	140
42f811b8 HX	141	#define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
	142	#define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
	143	#define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
eefef1cf	144	#define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
1da177e4	145
d94d9fee	146	struct in_ifaddr {
1da177e4 LT	147	struct in_ifaddr *ifa_next;
	148	struct in_device *ifa_dev;
	149	struct rcu_head rcu_head;
a144ea4b AV	150	__be32 ifa_local;
	151	__be32 ifa_address;
	152	__be32 ifa_mask;
	153	__be32 ifa_broadcast;
1da177e4 LT	154	unsigned char ifa_scope;
	155	unsigned char ifa_flags;
	156	unsigned char ifa_prefixlen;
	157	char ifa_label[IFNAMSIZ];
	158	};
	159
	160	extern int register_inetaddr_notifier(struct notifier_block *nb);
	161	extern int unregister_inetaddr_notifier(struct notifier_block *nb);
	162
82efee14 ED	163	extern struct net_device __ip_dev_find(struct net net, __be32 addr, bool devref);
	164	static inline struct net_device ip_dev_find(struct net net, __be32 addr)
	165	{
	166	return __ip_dev_find(net, addr, true);
	167	}
	168
ff428d72	169	extern int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
e5b13cb1	170	extern int devinet_ioctl(struct net net, unsigned int cmd, void __user );
1da177e4	171	extern void devinet_init(void);
7fee0ca2	172	extern struct in_device inetdev_by_index(struct net , int);
a61ced5d	173	extern __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
9bd85e32	174	extern __be32 inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
60cad5da	175	extern struct in_ifaddr inet_ifa_byprefix(struct in_device in_dev, __be32 prefix, __be32 mask);
1da177e4	176
60cad5da	177	static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
1da177e4 LT	178	{
	179	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
	180	}
	181
	182	/*
	183	* Check if a mask is acceptable.
	184	*/
	185
714e85be	186	static __inline__ int bad_mask(__be32 mask, __be32 addr)
1da177e4	187	{
714e85be	188	__u32 hmask;
1da177e4 LT	189	if (addr & (mask = ~mask))
1da177e4 LT	190	return 1;
714e85be AV	191	hmask = ntohl(mask);
714e85be AV	192	if (hmask & (hmask+1))
1da177e4 LT	193	return 1;
	194	return 0;
	195	}
	196
	197	#define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
	198	for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
	199
	200	#define for_ifa(in_dev) { struct in_ifaddr *ifa; \
	201	for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
	202
	203
	204	#define endfor_ifa(in_dev) }
	205
e5ed6399 HX	206	static inline struct in_device __in_dev_get_rcu(const struct net_device dev)
e5ed6399 HX	207	{
95ae6b22	208	return rcu_dereference(dev->ip_ptr);
e5ed6399 HX	209	}
e5ed6399 HX	210
95ae6b22	211	static inline struct in_device in_dev_get(const struct net_device dev)
1da177e4 LT	212	{
	213	struct in_device *in_dev;
	214
	215	rcu_read_lock();
e5ed6399	216	in_dev = __in_dev_get_rcu(dev);
1da177e4 LT	217	if (in_dev)
	218	atomic_inc(&in_dev->refcnt);
	219	rcu_read_unlock();
	220	return in_dev;
	221	}
	222
95ae6b22	223	static inline struct in_device __in_dev_get_rtnl(const struct net_device dev)
1da177e4	224	{
95ae6b22	225	return rcu_dereference_check(dev->ip_ptr, lockdep_rtnl_is_held());
1da177e4 LT	226	}
	227
	228	extern void in_dev_finish_destroy(struct in_device *idev);
	229
	230	static inline void in_dev_put(struct in_device *idev)
	231	{
	232	if (atomic_dec_and_test(&idev->refcnt))
	233	in_dev_finish_destroy(idev);
	234	}
	235
	236	#define __in_dev_put(idev) atomic_dec(&(idev)->refcnt)
	237	#define in_dev_hold(idev) atomic_inc(&(idev)->refcnt)
	238
	239	#endif /* __KERNEL__ */
	240
60cad5da	241	static __inline__ __be32 inet_make_mask(int logmask)
1da177e4 LT	242	{
	243	if (logmask)
	244	return htonl(~((1<<(32-logmask))-1));
	245	return 0;
	246	}
	247
714e85be	248	static __inline__ int inet_mask_len(__be32 mask)
1da177e4	249	{
714e85be AV	250	__u32 hmask = ntohl(mask);
714e85be AV	251	if (!hmask)
1da177e4	252	return 0;
714e85be	253	return 32 - ffz(~hmask);
1da177e4 LT	254	}
	255
	256
	257	#endif /* _LINUX_INETDEVICE_H */