[mirror_ubuntu-bionic-kernel.git] / include / linux / inetdevice.h

/* SPDX-License-Identifier: GPL-2.0 */
#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>
#include <linux/refcount.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;
	refcount_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 long		mr_qi;		/* Query Interval */
	unsigned long		mr_qri;		/* Query Response Interval */
	unsigned char		mr_qrv;		/* Query Robustness Variable */
	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 */
};

struct in_validator_info {
	__be32			ivi_addr;
	struct in_device	*ivi_dev;
	struct netlink_ext_ack	*extack;
};

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

void inet_netconf_notify_devconf(struct net *net, int event, 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);
struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
static __inline__ bool 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__ bool bad_mask(__be32 mask, __be32 addr)
{
	__u32 hmask;
	if (addr & (mask = ~mask))
		return true;
	hmask = ntohl(mask);
	if (hmask & (hmask+1))
		return true;
	return false;
}

#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)
		refcount_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 (refcount_dec_and_test(&idev->refcnt))
		in_dev_finish_destroy(idev);
}

#define __in_dev_put(idev)  refcount_dec(&(idev)->refcnt)
#define in_dev_hold(idev)   refcount_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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_INETDEVICE_H
	3	#define _LINUX_INETDEVICE_H
	4
	5	#ifdef __KERNEL__
	6
31be3085	7	#include <linux/bitmap.h>
1da177e4	8	#include <linux/if.h>
4a5a8aa6	9	#include <linux/ip.h>
1da177e4 LT	10	#include <linux/netdevice.h>
	11	#include <linux/rcupdate.h>
	12	#include <linux/timer.h>
8bfe6d68	13	#include <linux/sysctl.h>
95ae6b22	14	#include <linux/rtnetlink.h>
7658b36f	15	#include <linux/refcount.h>
1da177e4	16
d94d9fee	17	struct ipv4_devconf {
1da177e4	18	void *sysctl;
ca7479eb TG	19	int data[IPV4_DEVCONF_MAX];
ca7479eb TG	20	DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
1da177e4 LT	21	};
1da177e4 LT	22
e9897071 ED	23	#define MC_HASH_SZ_LOG 9
e9897071 ED	24
d94d9fee	25	struct in_device {
1da177e4	26	struct net_device *dev;
7658b36f	27	refcount_t refcnt;
1da177e4 LT	28	int dead;
1da177e4 LT	29	struct in_ifaddr ifa_list; / IP ifaddr chain */
e9897071	30
1d7138de	31	struct ip_mc_list __rcu mc_list; / IP multicast filter chain */
e9897071 ED	32	struct ip_mc_list __rcu * __rcu *mc_hash;
e9897071 ED	33
1d7138de	34	int mc_count; /* Number of installed mcasts */
1da177e4 LT	35	spinlock_t mc_tomb_lock;
	36	struct ip_mc_list *mc_tomb;
	37	unsigned long mr_v1_seen;
	38	unsigned long mr_v2_seen;
	39	unsigned long mr_maxdelay;
5b43d912 HL	40	unsigned long mr_qi; /* Query Interval */
	41	unsigned long mr_qri; /* Query Response Interval */
	42	unsigned char mr_qrv; /* Query Robustness Variable */
1da177e4 LT	43	unsigned char mr_gq_running;
	44	unsigned char mr_ifc_count;
	45	struct timer_list mr_gq_timer; /* general query timer */
	46	struct timer_list mr_ifc_timer; /* interface change timer */
	47
	48	struct neigh_parms *arp_parms;
	49	struct ipv4_devconf cnf;
	50	struct rcu_head rcu_head;
	51	};
	52
02291680	53	#define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
586f1211 PE	54	#define IPV4_DEVCONF_ALL(net, attr) \
586f1211 PE	55	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
42f811b8 HX	56
	57	static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
	58	{
	59	index--;
	60	return in_dev->cnf.data[index];
	61	}
	62
	63	static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
	64	int val)
	65	{
	66	index--;
31be3085	67	set_bit(index, in_dev->cnf.state);
42f811b8 HX	68	in_dev->cnf.data[index] = val;
	69	}
	70
71e27da9 HX	71	static inline void ipv4_devconf_setall(struct in_device *in_dev)
71e27da9 HX	72	{
ca7479eb	73	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
71e27da9 HX	74	}
71e27da9 HX	75
42f811b8	76	#define IN_DEV_CONF_GET(in_dev, attr) \
02291680	77	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
42f811b8	78	#define IN_DEV_CONF_SET(in_dev, attr, val) \
02291680	79	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
42f811b8 HX	80
42f811b8 HX	81	#define IN_DEV_ANDCONF(in_dev, attr) \
c346dca1	82	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
586f1211	83	IN_DEV_CONF_GET((in_dev), attr))
9eb43e76 ED	84
	85	#define IN_DEV_NET_ORCONF(in_dev, net, attr) \
	86	(IPV4_DEVCONF_ALL(net, attr) \|\| \
586f1211	87	IN_DEV_CONF_GET((in_dev), attr))
9eb43e76 ED	88
	89	#define IN_DEV_ORCONF(in_dev, attr) \
	90	IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
	91
42f811b8	92	#define IN_DEV_MAXCONF(in_dev, attr) \
c346dca1	93	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
586f1211	94	IN_DEV_CONF_GET((in_dev), attr)))
42f811b8 HX	95
42f811b8 HX	96	#define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING)
01ecfe9b	97	#define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
27fed417	98	#define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER)
28f6aeea	99	#define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK)
42f811b8 HX	100	#define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \
42f811b8 HX	101	ACCEPT_SOURCE_ROUTE)
8153a10c	102	#define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
42f811b8 HX	103	#define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
	104
	105	#define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
	106	#define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP)
65324144	107	#define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
42f811b8 HX	108	#define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
	109	#define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
	110	#define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \
	111	SECURE_REDIRECTS)
	112	#define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG)
	113	#define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
	114	#define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
	115	IN_DEV_ORCONF((in_dev), \
	116	PROMOTE_SECONDARIES)
d0daebc3	117	#define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
9eb43e76 ED	118	#define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \
9eb43e76 ED	119	IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
1da177e4 LT	120
	121	#define IN_DEV_RX_REDIRECTS(in_dev) \
	122	((IN_DEV_FORWARD(in_dev) && \
42f811b8	123	IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
1da177e4	124	\|\| (!IN_DEV_FORWARD(in_dev) && \
42f811b8	125	IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
1da177e4	126
0eeb075f AG	127	#define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
	128	IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
	129
42f811b8	130	#define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
124d37e9	131	#define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
42f811b8 HX	132	#define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
42f811b8 HX	133	#define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
eefef1cf	134	#define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
1da177e4	135
d94d9fee	136	struct in_ifaddr {
fd23c3b3	137	struct hlist_node hash;
1da177e4 LT	138	struct in_ifaddr *ifa_next;
	139	struct in_device *ifa_dev;
	140	struct rcu_head rcu_head;
a144ea4b AV	141	__be32 ifa_local;
	142	__be32 ifa_address;
	143	__be32 ifa_mask;
	144	__be32 ifa_broadcast;
1da177e4	145	unsigned char ifa_scope;
1da177e4	146	unsigned char ifa_prefixlen;
ad6c8135	147	__u32 ifa_flags;
1da177e4	148	char ifa_label[IFNAMSIZ];
5c766d64 JP	149
	150	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
	151	__u32 ifa_valid_lft;
	152	__u32 ifa_preferred_lft;
	153	unsigned long ifa_cstamp; /* created timestamp */
	154	unsigned long ifa_tstamp; /* updated timestamp */
1da177e4 LT	155	};
1da177e4 LT	156
3ad7d246 KJ	157	struct in_validator_info {
	158	__be32 ivi_addr;
	159	struct in_device *ivi_dev;
de95e047	160	struct netlink_ext_ack *extack;
3ad7d246 KJ	161	};
3ad7d246 KJ	162
f629d208 JP	163	int register_inetaddr_notifier(struct notifier_block *nb);
f629d208 JP	164	int unregister_inetaddr_notifier(struct notifier_block *nb);
3ad7d246 KJ	165	int register_inetaddr_validator_notifier(struct notifier_block *nb);
3ad7d246 KJ	166	int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
1da177e4	167
3b022865 DA	168	void inet_netconf_notify_devconf(struct net *net, int event, int type,
3b022865 DA	169	int ifindex, struct ipv4_devconf *devconf);
d67b8c61	170
f629d208	171	struct net_device __ip_dev_find(struct net net, __be32 addr, bool devref);
82efee14 ED	172	static inline struct net_device ip_dev_find(struct net net, __be32 addr)
	173	{
	174	return __ip_dev_find(net, addr, true);
	175	}
	176
f629d208 JP	177	int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
	178	int devinet_ioctl(struct net net, unsigned int cmd, void __user );
	179	void devinet_init(void);
	180	struct in_device inetdev_by_index(struct net , int);
	181	__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
b601fa19 ND	182	__be32 inet_confirm_addr(struct net net, struct in_device in_dev, __be32 dst,
b601fa19 ND	183	__be32 local, int scope);
f629d208 JP	184	struct in_ifaddr inet_ifa_byprefix(struct in_device in_dev, __be32 prefix,
f629d208 JP	185	__be32 mask);
6e617de8	186	struct in_ifaddr inet_lookup_ifaddr_rcu(struct net net, __be32 addr);
c3225164	187	static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
1da177e4 LT	188	{
	189	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
	190	}
	191
	192	/*
	193	* Check if a mask is acceptable.
	194	*/
	195
f06cc7b2	196	static __inline__ bool bad_mask(__be32 mask, __be32 addr)
1da177e4	197	{
714e85be	198	__u32 hmask;
1da177e4	199	if (addr & (mask = ~mask))
f06cc7b2	200	return true;
714e85be AV	201	hmask = ntohl(mask);
714e85be AV	202	if (hmask & (hmask+1))
f06cc7b2 YB	203	return true;
f06cc7b2 YB	204	return false;
1da177e4 LT	205	}
	206
	207	#define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
	208	for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
	209
	210	#define for_ifa(in_dev) { struct in_ifaddr *ifa; \
	211	for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
	212
	213
	214	#define endfor_ifa(in_dev) }
	215
e5ed6399 HX	216	static inline struct in_device __in_dev_get_rcu(const struct net_device dev)
e5ed6399 HX	217	{
95ae6b22	218	return rcu_dereference(dev->ip_ptr);
e5ed6399 HX	219	}
e5ed6399 HX	220
95ae6b22	221	static inline struct in_device in_dev_get(const struct net_device dev)
1da177e4 LT	222	{
	223	struct in_device *in_dev;
	224
	225	rcu_read_lock();
e5ed6399	226	in_dev = __in_dev_get_rcu(dev);
1da177e4	227	if (in_dev)
7658b36f	228	refcount_inc(&in_dev->refcnt);
1da177e4 LT	229	rcu_read_unlock();
	230	return in_dev;
	231	}
	232
95ae6b22	233	static inline struct in_device __in_dev_get_rtnl(const struct net_device dev)
1da177e4	234	{
06a9701f	235	return rtnl_dereference(dev->ip_ptr);
1da177e4 LT	236	}
1da177e4 LT	237
1d4c8c29 JP	238	static inline struct neigh_parms __in_dev_arp_parms_get_rcu(const struct net_device dev)
	239	{
	240	struct in_device *in_dev = __in_dev_get_rcu(dev);
	241
	242	return in_dev ? in_dev->arp_parms : NULL;
	243	}
	244
f629d208	245	void in_dev_finish_destroy(struct in_device *idev);
1da177e4 LT	246
	247	static inline void in_dev_put(struct in_device *idev)
	248	{
7658b36f	249	if (refcount_dec_and_test(&idev->refcnt))
1da177e4 LT	250	in_dev_finish_destroy(idev);
	251	}
	252
7658b36f RE	253	#define __in_dev_put(idev) refcount_dec(&(idev)->refcnt)
7658b36f RE	254	#define in_dev_hold(idev) refcount_inc(&(idev)->refcnt)
1da177e4 LT	255
	256	#endif /* __KERNEL__ */
	257
60cad5da	258	static __inline__ __be32 inet_make_mask(int logmask)
1da177e4 LT	259	{
1da177e4 LT	260	if (logmask)
84bc8868	261	return htonl(~((1U<<(32-logmask))-1));
1da177e4 LT	262	return 0;
	263	}
	264
714e85be	265	static __inline__ int inet_mask_len(__be32 mask)
1da177e4	266	{
714e85be AV	267	__u32 hmask = ntohl(mask);
714e85be AV	268	if (!hmask)
1da177e4	269	return 0;
714e85be	270	return 32 - ffz(~hmask);
1da177e4 LT	271	}
	272
	273
	274	#endif /* _LINUX_INETDEVICE_H */