[linux-2.6-block.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/ip.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
#include <linux/timer.h>
#include <linux/sysctl.h>
#include <linux/rtnetlink.h>

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

#define MC_HASH_SZ_LOG 9

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    */
	struct ip_mc_list __rcu	* __rcu *mc_hash;

	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_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
	IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)

#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_prefixlen;
	__u32			ifa_flags;
	char			ifa_label[IFNAMSIZ];

	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
	__u32			ifa_valid_lft;
	__u32			ifa_preferred_lft;
	unsigned long		ifa_cstamp; /* created timestamp */
	unsigned long		ifa_tstamp; /* updated timestamp */
};

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

void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
				 struct ipv4_devconf *devconf);

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);
}

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

static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
{
	struct in_device *in_dev = __in_dev_get_rcu(dev);

	return in_dev ? in_dev->arp_parms : NULL;
}

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(~((1U<<(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	7	#include <linux/if.h>
4a5a8aa6	8	#include <linux/ip.h>
1da177e4 LT	9	#include <linux/netdevice.h>
	10	#include <linux/rcupdate.h>
	11	#include <linux/timer.h>
8bfe6d68	12	#include <linux/sysctl.h>
95ae6b22	13	#include <linux/rtnetlink.h>
1da177e4	14
d94d9fee	15	struct ipv4_devconf {
1da177e4	16	void *sysctl;
ca7479eb TG	17	int data[IPV4_DEVCONF_MAX];
ca7479eb TG	18	DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
1da177e4 LT	19	};
1da177e4 LT	20
e9897071 ED	21	#define MC_HASH_SZ_LOG 9
e9897071 ED	22
d94d9fee	23	struct in_device {
1da177e4 LT	24	struct net_device *dev;
	25	atomic_t refcnt;
	26	int dead;
	27	struct in_ifaddr ifa_list; / IP ifaddr chain */
e9897071	28
1d7138de	29	struct ip_mc_list __rcu mc_list; / IP multicast filter chain */
e9897071 ED	30	struct ip_mc_list __rcu * __rcu *mc_hash;
e9897071 ED	31
1d7138de	32	int mc_count; /* Number of installed mcasts */
1da177e4 LT	33	spinlock_t mc_tomb_lock;
	34	struct ip_mc_list *mc_tomb;
	35	unsigned long mr_v1_seen;
	36	unsigned long mr_v2_seen;
	37	unsigned long mr_maxdelay;
	38	unsigned char mr_qrv;
	39	unsigned char mr_gq_running;
	40	unsigned char mr_ifc_count;
	41	struct timer_list mr_gq_timer; /* general query timer */
	42	struct timer_list mr_ifc_timer; /* interface change timer */
	43
	44	struct neigh_parms *arp_parms;
	45	struct ipv4_devconf cnf;
	46	struct rcu_head rcu_head;
	47	};
	48
02291680	49	#define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
586f1211 PE	50	#define IPV4_DEVCONF_ALL(net, attr) \
586f1211 PE	51	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
42f811b8 HX	52
	53	static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
	54	{
	55	index--;
	56	return in_dev->cnf.data[index];
	57	}
	58
	59	static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
	60	int val)
	61	{
	62	index--;
31be3085	63	set_bit(index, in_dev->cnf.state);
42f811b8 HX	64	in_dev->cnf.data[index] = val;
	65	}
	66
71e27da9 HX	67	static inline void ipv4_devconf_setall(struct in_device *in_dev)
71e27da9 HX	68	{
ca7479eb	69	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
71e27da9 HX	70	}
71e27da9 HX	71
42f811b8	72	#define IN_DEV_CONF_GET(in_dev, attr) \
02291680	73	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
42f811b8	74	#define IN_DEV_CONF_SET(in_dev, attr, val) \
02291680	75	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
42f811b8 HX	76
42f811b8 HX	77	#define IN_DEV_ANDCONF(in_dev, attr) \
c346dca1	78	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
586f1211	79	IN_DEV_CONF_GET((in_dev), attr))
9eb43e76 ED	80
	81	#define IN_DEV_NET_ORCONF(in_dev, net, attr) \
	82	(IPV4_DEVCONF_ALL(net, attr) \|\| \
586f1211	83	IN_DEV_CONF_GET((in_dev), attr))
9eb43e76 ED	84
	85	#define IN_DEV_ORCONF(in_dev, attr) \
	86	IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
	87
42f811b8	88	#define IN_DEV_MAXCONF(in_dev, attr) \
c346dca1	89	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
586f1211	90	IN_DEV_CONF_GET((in_dev), attr)))
42f811b8 HX	91
42f811b8 HX	92	#define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING)
01ecfe9b	93	#define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
27fed417	94	#define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER)
28f6aeea	95	#define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK)
42f811b8 HX	96	#define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \
42f811b8 HX	97	ACCEPT_SOURCE_ROUTE)
8153a10c	98	#define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
42f811b8 HX	99	#define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
	100
	101	#define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
	102	#define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP)
65324144	103	#define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
42f811b8 HX	104	#define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
	105	#define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
	106	#define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \
	107	SECURE_REDIRECTS)
	108	#define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG)
	109	#define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
	110	#define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
	111	IN_DEV_ORCONF((in_dev), \
	112	PROMOTE_SECONDARIES)
d0daebc3	113	#define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
9eb43e76 ED	114	#define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \
9eb43e76 ED	115	IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
1da177e4 LT	116
	117	#define IN_DEV_RX_REDIRECTS(in_dev) \
	118	((IN_DEV_FORWARD(in_dev) && \
42f811b8	119	IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
1da177e4	120	\|\| (!IN_DEV_FORWARD(in_dev) && \
42f811b8	121	IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
1da177e4	122
0eeb075f AG	123	#define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
	124	IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
	125
42f811b8	126	#define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
124d37e9	127	#define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
42f811b8 HX	128	#define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
42f811b8 HX	129	#define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
eefef1cf	130	#define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
1da177e4	131
d94d9fee	132	struct in_ifaddr {
fd23c3b3	133	struct hlist_node hash;
1da177e4 LT	134	struct in_ifaddr *ifa_next;
	135	struct in_device *ifa_dev;
	136	struct rcu_head rcu_head;
a144ea4b AV	137	__be32 ifa_local;
	138	__be32 ifa_address;
	139	__be32 ifa_mask;
	140	__be32 ifa_broadcast;
1da177e4	141	unsigned char ifa_scope;
1da177e4	142	unsigned char ifa_prefixlen;
ad6c8135	143	__u32 ifa_flags;
1da177e4	144	char ifa_label[IFNAMSIZ];
5c766d64 JP	145
	146	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
	147	__u32 ifa_valid_lft;
	148	__u32 ifa_preferred_lft;
	149	unsigned long ifa_cstamp; /* created timestamp */
	150	unsigned long ifa_tstamp; /* updated timestamp */
1da177e4 LT	151	};
1da177e4 LT	152
f629d208 JP	153	int register_inetaddr_notifier(struct notifier_block *nb);
f629d208 JP	154	int unregister_inetaddr_notifier(struct notifier_block *nb);
1da177e4	155
f629d208 JP	156	void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
f629d208 JP	157	struct ipv4_devconf *devconf);
d67b8c61	158
f629d208	159	struct net_device __ip_dev_find(struct net net, __be32 addr, bool devref);
82efee14 ED	160	static inline struct net_device ip_dev_find(struct net net, __be32 addr)
	161	{
	162	return __ip_dev_find(net, addr, true);
	163	}
	164
f629d208 JP	165	int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
	166	int devinet_ioctl(struct net net, unsigned int cmd, void __user );
	167	void devinet_init(void);
	168	struct in_device inetdev_by_index(struct net , int);
	169	__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
b601fa19 ND	170	__be32 inet_confirm_addr(struct net net, struct in_device in_dev, __be32 dst,
b601fa19 ND	171	__be32 local, int scope);
f629d208 JP	172	struct in_ifaddr inet_ifa_byprefix(struct in_device in_dev, __be32 prefix,
f629d208 JP	173	__be32 mask);
60cad5da	174	static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
1da177e4 LT	175	{
	176	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
	177	}
	178
	179	/*
	180	* Check if a mask is acceptable.
	181	*/
	182
714e85be	183	static __inline__ int bad_mask(__be32 mask, __be32 addr)
1da177e4	184	{
714e85be	185	__u32 hmask;
1da177e4 LT	186	if (addr & (mask = ~mask))
1da177e4 LT	187	return 1;
714e85be AV	188	hmask = ntohl(mask);
714e85be AV	189	if (hmask & (hmask+1))
1da177e4 LT	190	return 1;
	191	return 0;
	192	}
	193
	194	#define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
	195	for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
	196
	197	#define for_ifa(in_dev) { struct in_ifaddr *ifa; \
	198	for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
	199
	200
	201	#define endfor_ifa(in_dev) }
	202
e5ed6399 HX	203	static inline struct in_device __in_dev_get_rcu(const struct net_device dev)
e5ed6399 HX	204	{
95ae6b22	205	return rcu_dereference(dev->ip_ptr);
e5ed6399 HX	206	}
e5ed6399 HX	207
95ae6b22	208	static inline struct in_device in_dev_get(const struct net_device dev)
1da177e4 LT	209	{
	210	struct in_device *in_dev;
	211
	212	rcu_read_lock();
e5ed6399	213	in_dev = __in_dev_get_rcu(dev);
1da177e4 LT	214	if (in_dev)
	215	atomic_inc(&in_dev->refcnt);
	216	rcu_read_unlock();
	217	return in_dev;
	218	}
	219
95ae6b22	220	static inline struct in_device __in_dev_get_rtnl(const struct net_device dev)
1da177e4	221	{
06a9701f	222	return rtnl_dereference(dev->ip_ptr);
1da177e4 LT	223	}
1da177e4 LT	224
1d4c8c29 JP	225	static inline struct neigh_parms __in_dev_arp_parms_get_rcu(const struct net_device dev)
	226	{
	227	struct in_device *in_dev = __in_dev_get_rcu(dev);
	228
	229	return in_dev ? in_dev->arp_parms : NULL;
	230	}
	231
f629d208	232	void in_dev_finish_destroy(struct in_device *idev);
1da177e4 LT	233
	234	static inline void in_dev_put(struct in_device *idev)
	235	{
	236	if (atomic_dec_and_test(&idev->refcnt))
	237	in_dev_finish_destroy(idev);
	238	}
	239
	240	#define __in_dev_put(idev) atomic_dec(&(idev)->refcnt)
	241	#define in_dev_hold(idev) atomic_inc(&(idev)->refcnt)
	242
	243	#endif /* __KERNEL__ */
	244
60cad5da	245	static __inline__ __be32 inet_make_mask(int logmask)
1da177e4 LT	246	{
1da177e4 LT	247	if (logmask)
84bc8868	248	return htonl(~((1U<<(32-logmask))-1));
1da177e4 LT	249	return 0;
	250	}
	251
714e85be	252	static __inline__ int inet_mask_len(__be32 mask)
1da177e4	253	{
714e85be AV	254	__u32 hmask = ntohl(mask);
714e85be AV	255	if (!hmask)
1da177e4	256	return 0;
714e85be	257	return 32 - ffz(~hmask);
1da177e4 LT	258	}
	259
	260
	261	#endif /* _LINUX_INETDEVICE_H */