[GitHub/mt8127/android_kernel_alcatel_ttab.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_ROUTE_LOCALNET,
	__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_NET_ORCONF(in_dev, net, attr) \
	(IPV4_DEVCONF_ALL(net, attr) || \
	 IN_DEV_CONF_GET((in_dev), attr))

#define IN_DEV_ORCONF(in_dev, attr) \
	IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->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_ROUTE_LOCALNET(in_dev)	IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
#define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)	\
	IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)

#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_ACCEPT(in_dev)	IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
#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 hlist_node	hash;
	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 rtnl_dereference(dev->ip_ptr);
}

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
	1	#ifndef _LINUX_INETDEVICE_H
	2	#define _LINUX_INETDEVICE_H
	3
	4	#ifdef __KERNEL__
	5
	6	#include <linux/bitmap.h>
	7	#include <linux/if.h>
	8	#include <linux/netdevice.h>
	9	#include <linux/rcupdate.h>
	10	#include <linux/timer.h>
	11	#include <linux/sysctl.h>
	12	#include <linux/rtnetlink.h>
	13
	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_ROUTE_LOCALNET,
	42	__IPV4_DEVCONF_MAX
	43	};
	44
	45	#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
	46
	47	struct ipv4_devconf {
	48	void *sysctl;
	49	int data[IPV4_DEVCONF_MAX];
	50	DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
	51	};
	52
	53	struct in_device {
	54	struct net_device *dev;
	55	atomic_t refcnt;
	56	int dead;
	57	struct in_ifaddr ifa_list; / IP ifaddr chain */
	58	struct ip_mc_list __rcu mc_list; / IP multicast filter chain */
	59	int mc_count; /* Number of installed mcasts */
	60	spinlock_t mc_tomb_lock;
	61	struct ip_mc_list *mc_tomb;
	62	unsigned long mr_v1_seen;
	63	unsigned long mr_v2_seen;
	64	unsigned long mr_maxdelay;
	65	unsigned char mr_qrv;
	66	unsigned char mr_gq_running;
	67	unsigned char mr_ifc_count;
	68	struct timer_list mr_gq_timer; /* general query timer */
	69	struct timer_list mr_ifc_timer; /* interface change timer */
	70
	71	struct neigh_parms *arp_parms;
	72	struct ipv4_devconf cnf;
	73	struct rcu_head rcu_head;
	74	};
	75
	76	#define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
	77	#define IPV4_DEVCONF_ALL(net, attr) \
	78	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
	79
	80	static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
	81	{
	82	index--;
	83	return in_dev->cnf.data[index];
	84	}
	85
	86	static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
	87	int val)
	88	{
	89	index--;
	90	set_bit(index, in_dev->cnf.state);
	91	in_dev->cnf.data[index] = val;
	92	}
	93
	94	static inline void ipv4_devconf_setall(struct in_device *in_dev)
	95	{
	96	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
	97	}
	98
	99	#define IN_DEV_CONF_GET(in_dev, attr) \
	100	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
	101	#define IN_DEV_CONF_SET(in_dev, attr, val) \
	102	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
	103
	104	#define IN_DEV_ANDCONF(in_dev, attr) \
	105	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
	106	IN_DEV_CONF_GET((in_dev), attr))
	107
	108	#define IN_DEV_NET_ORCONF(in_dev, net, attr) \
	109	(IPV4_DEVCONF_ALL(net, attr) \|\| \
	110	IN_DEV_CONF_GET((in_dev), attr))
	111
	112	#define IN_DEV_ORCONF(in_dev, attr) \
	113	IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
	114
	115	#define IN_DEV_MAXCONF(in_dev, attr) \
	116	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
	117	IN_DEV_CONF_GET((in_dev), attr)))
	118
	119	#define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING)
	120	#define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
	121	#define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER)
	122	#define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK)
	123	#define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \
	124	ACCEPT_SOURCE_ROUTE)
	125	#define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
	126	#define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
	127
	128	#define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
	129	#define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP)
	130	#define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
	131	#define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
	132	#define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
	133	#define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \
	134	SECURE_REDIRECTS)
	135	#define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG)
	136	#define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
	137	#define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
	138	IN_DEV_ORCONF((in_dev), \
	139	PROMOTE_SECONDARIES)
	140	#define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
	141	#define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \
	142	IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
	143
	144	#define IN_DEV_RX_REDIRECTS(in_dev) \
	145	((IN_DEV_FORWARD(in_dev) && \
	146	IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
	147	\|\| (!IN_DEV_FORWARD(in_dev) && \
	148	IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
	149
	150	#define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
	151	#define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
	152	#define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
	153	#define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
	154	#define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
	155
	156	struct in_ifaddr {
	157	struct hlist_node hash;
	158	struct in_ifaddr *ifa_next;
	159	struct in_device *ifa_dev;
	160	struct rcu_head rcu_head;
	161	__be32 ifa_local;
	162	__be32 ifa_address;
	163	__be32 ifa_mask;
	164	__be32 ifa_broadcast;
	165	unsigned char ifa_scope;
	166	unsigned char ifa_flags;
	167	unsigned char ifa_prefixlen;
	168	char ifa_label[IFNAMSIZ];
	169	};
	170
	171	extern int register_inetaddr_notifier(struct notifier_block *nb);
	172	extern int unregister_inetaddr_notifier(struct notifier_block *nb);
	173
	174	extern struct net_device __ip_dev_find(struct net net, __be32 addr, bool devref);
	175	static inline struct net_device ip_dev_find(struct net net, __be32 addr)
	176	{
	177	return __ip_dev_find(net, addr, true);
	178	}
	179
	180	extern int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
	181	extern int devinet_ioctl(struct net net, unsigned int cmd, void __user );
	182	extern void devinet_init(void);
	183	extern struct in_device inetdev_by_index(struct net , int);
	184	extern __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
	185	extern __be32 inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
	186	extern struct in_ifaddr inet_ifa_byprefix(struct in_device in_dev, __be32 prefix, __be32 mask);
	187
	188	static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
	189	{
	190	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
	191	}
	192
	193	/*
	194	* Check if a mask is acceptable.
	195	*/
	196
	197	static __inline__ int bad_mask(__be32 mask, __be32 addr)
	198	{
	199	__u32 hmask;
	200	if (addr & (mask = ~mask))
	201	return 1;
	202	hmask = ntohl(mask);
	203	if (hmask & (hmask+1))
	204	return 1;
	205	return 0;
	206	}
	207
	208	#define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
	209	for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
	210
	211	#define for_ifa(in_dev) { struct in_ifaddr *ifa; \
	212	for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
	213
	214
	215	#define endfor_ifa(in_dev) }
	216
	217	static inline struct in_device __in_dev_get_rcu(const struct net_device dev)
	218	{
	219	return rcu_dereference(dev->ip_ptr);
	220	}
	221
	222	static inline struct in_device in_dev_get(const struct net_device dev)
	223	{
	224	struct in_device *in_dev;
	225
	226	rcu_read_lock();
	227	in_dev = __in_dev_get_rcu(dev);
	228	if (in_dev)
	229	atomic_inc(&in_dev->refcnt);
	230	rcu_read_unlock();
	231	return in_dev;
	232	}
	233
	234	static inline struct in_device __in_dev_get_rtnl(const struct net_device dev)
	235	{
	236	return rtnl_dereference(dev->ip_ptr);
	237	}
	238
	239	extern void in_dev_finish_destroy(struct in_device *idev);
	240
	241	static inline void in_dev_put(struct in_device *idev)
	242	{
	243	if (atomic_dec_and_test(&idev->refcnt))
	244	in_dev_finish_destroy(idev);
	245	}
	246
	247	#define __in_dev_put(idev) atomic_dec(&(idev)->refcnt)
	248	#define in_dev_hold(idev) atomic_inc(&(idev)->refcnt)
	249
	250	#endif /* __KERNEL__ */
	251
	252	static __inline__ __be32 inet_make_mask(int logmask)
	253	{
	254	if (logmask)
	255	return htonl(~((1<<(32-logmask))-1));
	256	return 0;
	257	}
	258
	259	static __inline__ int inet_mask_len(__be32 mask)
	260	{
	261	__u32 hmask = ntohl(mask);
	262	if (!hmask)
	263	return 0;
	264	return 32 - ffz(~hmask);
	265	}
	266
	267
	268	#endif /* _LINUX_INETDEVICE_H */