[mirror_ubuntu-artful-kernel.git] / include / net / addrconf.h

#ifndef _ADDRCONF_H
#define _ADDRCONF_H

#define MAX_RTR_SOLICITATIONS		3
#define RTR_SOLICITATION_INTERVAL	(4*HZ)

#define MIN_VALID_LIFETIME		(2*3600)	/* 2 hours */

#define TEMP_VALID_LIFETIME		(7*86400)
#define TEMP_PREFERRED_LIFETIME		(86400)
#define REGEN_MAX_RETRY			(3)
#define MAX_DESYNC_FACTOR		(600)

#define ADDR_CHECK_FREQUENCY		(120*HZ)

#define IPV6_MAX_ADDRESSES		16

#define ADDRCONF_TIMER_FUZZ_MINUS	(HZ > 50 ? HZ / 50 : 1)
#define ADDRCONF_TIMER_FUZZ		(HZ / 4)
#define ADDRCONF_TIMER_FUZZ_MAX		(HZ)

#include <linux/in.h>
#include <linux/in6.h>

struct prefix_info {
	__u8			type;
	__u8			length;
	__u8			prefix_len;

#if defined(__BIG_ENDIAN_BITFIELD)
	__u8			onlink : 1,
			 	autoconf : 1,
				reserved : 6;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
	__u8			reserved : 6,
				autoconf : 1,
				onlink : 1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	__be32			valid;
	__be32			prefered;
	__be32			reserved2;

	struct in6_addr		prefix;
};


#include <linux/netdevice.h>
#include <net/if_inet6.h>
#include <net/ipv6.h>

#define IN6_ADDR_HSIZE_SHIFT	4
#define IN6_ADDR_HSIZE		(1 << IN6_ADDR_HSIZE_SHIFT)

int addrconf_init(void);
void addrconf_cleanup(void);

int addrconf_add_ifaddr(struct net *net, void __user *arg);
int addrconf_del_ifaddr(struct net *net, void __user *arg);
int addrconf_set_dstaddr(struct net *net, void __user *arg);

int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
		  const struct net_device *dev, int strict);

#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
#endif

bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
				   const unsigned int prefix_len,
				   struct net_device *dev);

int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);

struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
				     const struct in6_addr *addr,
				     struct net_device *dev, int strict);

int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
		       const struct in6_addr *daddr, unsigned int srcprefs,
		       struct in6_addr *saddr);
int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
		      u32 banned_flags);
int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
		    u32 banned_flags);
int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2);
void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);

static inline unsigned long addrconf_timeout_fixup(u32 timeout,
						   unsigned int unit)
{
	if (timeout == 0xffffffff)
		return ~0UL;

	/*
	 * Avoid arithmetic overflow.
	 * Assuming unit is constant and non-zero, this "if" statement
	 * will go away on 64bit archs.
	 */
	if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
		return LONG_MAX / unit;

	return timeout;
}

static inline int addrconf_finite_timeout(unsigned long timeout)
{
	return ~timeout;
}

/*
 *	IPv6 Address Label subsystem (addrlabel.c)
 */
int ipv6_addr_label_init(void);
void ipv6_addr_label_cleanup(void);
void ipv6_addr_label_rtnl_register(void);
u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
		    int type, int ifindex);

/*
 *	multicast prototypes (mcast.c)
 */
int ipv6_sock_mc_join(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
void ipv6_sock_mc_close(struct sock *sk);
bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
		    const struct in6_addr *src_addr);

int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
void ipv6_mc_up(struct inet6_dev *idev);
void ipv6_mc_down(struct inet6_dev *idev);
void ipv6_mc_unmap(struct inet6_dev *idev);
void ipv6_mc_remap(struct inet6_dev *idev);
void ipv6_mc_init_dev(struct inet6_dev *idev);
void ipv6_mc_destroy_dev(struct inet6_dev *idev);
void addrconf_dad_failure(struct inet6_ifaddr *ifp);

bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
			 const struct in6_addr *src_addr);

void ipv6_mc_dad_complete(struct inet6_dev *idev);

/* A stub used by vxlan module. This is ugly, ideally these
 * symbols should be built into the core kernel.
 */
struct ipv6_stub {
	int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
				 const struct in6_addr *addr);
	int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
				 const struct in6_addr *addr);
	int (*ipv6_dst_lookup)(struct sock *sk, struct dst_entry **dst,
				struct flowi6 *fl6);
	void (*udpv6_encap_enable)(void);
	void (*ndisc_send_na)(struct net_device *dev, struct neighbour *neigh,
			      const struct in6_addr *daddr,
			      const struct in6_addr *solicited_addr,
			      bool router, bool solicited, bool override, bool inc_opt);
	struct neigh_table *nd_tbl;
};
extern const struct ipv6_stub *ipv6_stub __read_mostly;

/*
 * identify MLD packets for MLD filter exceptions
 */
static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
{
	struct icmp6hdr *hdr;

	if (nexthdr != IPPROTO_ICMPV6 ||
	    !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
		return false;

	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);

	switch (hdr->icmp6_type) {
	case ICMPV6_MGM_QUERY:
	case ICMPV6_MGM_REPORT:
	case ICMPV6_MGM_REDUCTION:
	case ICMPV6_MLD2_REPORT:
		return true;
	default:
		break;
	}
	return false;
}

void addrconf_prefix_rcv(struct net_device *dev,
			 u8 *opt, int len, bool sllao);

/*
 *	anycast prototypes (anycast.c)
 */
int ipv6_sock_ac_join(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
void ipv6_sock_ac_close(struct sock *sk);

int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr);
int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
			 const struct in6_addr *addr);
bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
			     const struct in6_addr *addr);

/* Device notifier */
int register_inet6addr_notifier(struct notifier_block *nb);
int unregister_inet6addr_notifier(struct notifier_block *nb);
int inet6addr_notifier_call_chain(unsigned long val, void *v);

void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
				  struct ipv6_devconf *devconf);

/**
 * __in6_dev_get - get inet6_dev pointer from netdevice
 * @dev: network device
 *
 * Caller must hold rcu_read_lock or RTNL, because this function
 * does not take a reference on the inet6_dev.
 */
static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
{
	return rcu_dereference_rtnl(dev->ip6_ptr);
}

/**
 * in6_dev_get - get inet6_dev pointer from netdevice
 * @dev: network device
 *
 * This version can be used in any context, and takes a reference
 * on the inet6_dev. Callers must use in6_dev_put() later to
 * release this reference.
 */
static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
{
	struct inet6_dev *idev;

	rcu_read_lock();
	idev = rcu_dereference(dev->ip6_ptr);
	if (idev)
		atomic_inc(&idev->refcnt);
	rcu_read_unlock();
	return idev;
}

static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
{
	struct inet6_dev *idev = __in6_dev_get(dev);

	return idev ? idev->nd_parms : NULL;
}

void in6_dev_finish_destroy(struct inet6_dev *idev);

static inline void in6_dev_put(struct inet6_dev *idev)
{
	if (atomic_dec_and_test(&idev->refcnt))
		in6_dev_finish_destroy(idev);
}

static inline void __in6_dev_put(struct inet6_dev *idev)
{
	atomic_dec(&idev->refcnt);
}

static inline void in6_dev_hold(struct inet6_dev *idev)
{
	atomic_inc(&idev->refcnt);
}

void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);

static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
{
	if (atomic_dec_and_test(&ifp->refcnt))
		inet6_ifa_finish_destroy(ifp);
}

static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
{
	atomic_dec(&ifp->refcnt);
}

static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
{
	atomic_inc(&ifp->refcnt);
}


/*
 *	compute link-local solicited-node multicast address
 */

static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
					     struct in6_addr *solicited)
{
	ipv6_addr_set(solicited,
		      htonl(0xFF020000), 0,
		      htonl(0x1),
		      htonl(0xFF000000) | addr->s6_addr32[3]);
}

static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
{
	return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
}

static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	__be64 *p = (__be64 *)addr;
	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
#else
	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
		addr->s6_addr32[1] | addr->s6_addr32[2] |
		(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
#endif
}

static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	__be64 *p = (__be64 *)addr;
	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
#else
	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
		addr->s6_addr32[1] | addr->s6_addr32[2] |
		(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
#endif
}

static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
{
	return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
}

static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	__be64 *p = (__be64 *)addr;
	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
		((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
		 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
#else
	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
		addr->s6_addr32[1] |
		(addr->s6_addr32[2] ^ htonl(0x00000001)) |
		(addr->s6_addr[12] ^ 0xff)) == 0;
#endif
}

#ifdef CONFIG_PROC_FS
int if6_proc_init(void);
void if6_proc_exit(void);
#endif

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _ADDRCONF_H
	2	#define _ADDRCONF_H
	3
1da177e4 LT	4	#define MAX_RTR_SOLICITATIONS 3
	5	#define RTR_SOLICITATION_INTERVAL (4*HZ)
	6
	7	#define MIN_VALID_LIFETIME (23600) / 2 hours */
	8
	9	#define TEMP_VALID_LIFETIME (7*86400)
	10	#define TEMP_PREFERRED_LIFETIME (86400)
76f793e3	11	#define REGEN_MAX_RETRY (3)
1da177e4 LT	12	#define MAX_DESYNC_FACTOR (600)
	13
	14	#define ADDR_CHECK_FREQUENCY (120*HZ)
	15
	16	#define IPV6_MAX_ADDRESSES 16
	17
5c766d64 JP	18	#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
	19	#define ADDRCONF_TIMER_FUZZ (HZ / 4)
	20	#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
	21
c7dc89c0	22	#include <linux/in.h>
6a800d45 PM	23	#include <linux/in6.h>
6a800d45 PM	24
1da177e4 LT	25	struct prefix_info {
	26	__u8 type;
	27	__u8 length;
	28	__u8 prefix_len;
	29
	30	#if defined(__BIG_ENDIAN_BITFIELD)
	31	__u8 onlink : 1,
	32	autoconf : 1,
	33	reserved : 6;
	34	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	35	__u8 reserved : 6,
	36	autoconf : 1,
	37	onlink : 1;
	38	#else
	39	#error "Please fix <asm/byteorder.h>"
	40	#endif
e69a4adc AV	41	__be32 valid;
	42	__be32 prefered;
	43	__be32 reserved2;
1da177e4 LT	44
	45	struct in6_addr prefix;
	46	};
	47
	48
1da177e4 LT	49	#include <linux/netdevice.h>
1da177e4 LT	50	#include <net/if_inet6.h>
e4553edd	51	#include <net/ipv6.h>
1da177e4	52
ddbe5032 ED	53	#define IN6_ADDR_HSIZE_SHIFT 4
ddbe5032 ED	54	#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4	55
e8e54d3c JP	56	int addrconf_init(void);
e8e54d3c JP	57	void addrconf_cleanup(void);
1da177e4	58
e8e54d3c JP	59	int addrconf_add_ifaddr(struct net net, void __user arg);
	60	int addrconf_del_ifaddr(struct net net, void __user arg);
	61	int addrconf_set_dstaddr(struct net net, void __user arg);
1da177e4	62
e8e54d3c JP	63	int ipv6_chk_addr(struct net net, const struct in6_addr addr,
e8e54d3c JP	64	const struct net_device *dev, int strict);
bfeade08	65
59fbb3a6	66	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
e8e54d3c	67	int ipv6_chk_home_addr(struct net net, const struct in6_addr addr);
65d4ed92	68	#endif
52eeeb84	69
7df37ff3 CB	70	bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
	71	const unsigned int prefix_len,
	72	struct net_device *dev);
	73
e8e54d3c JP	74	int ipv6_chk_prefix(const struct in6_addr addr, struct net_device dev);
	75
	76	struct inet6_ifaddr ipv6_get_ifaddr(struct net net,
	77	const struct in6_addr *addr,
	78	struct net_device *dev, int strict);
	79
	80	int ipv6_dev_get_saddr(struct net net, const struct net_device dev,
	81	const struct in6_addr *daddr, unsigned int srcprefs,
	82	struct in6_addr *saddr);
	83	int __ipv6_get_lladdr(struct inet6_dev idev, struct in6_addr addr,
479840ff	84	u32 banned_flags);
e8e54d3c	85	int ipv6_get_lladdr(struct net_device dev, struct in6_addr addr,
479840ff	86	u32 banned_flags);
e8e54d3c JP	87	int ipv6_rcv_saddr_equal(const struct sock sk, const struct sock sk2);
	88	void addrconf_join_solict(struct net_device dev, const struct in6_addr addr);
	89	void addrconf_leave_solict(struct inet6_dev idev, const struct in6_addr addr);
1da177e4	90
4bed72e4	91	static inline unsigned long addrconf_timeout_fixup(u32 timeout,
95c96174	92	unsigned int unit)
4bed72e4 YH	93	{
	94	if (timeout == 0xffffffff)
	95	return ~0UL;
	96
	97	/*
	98	* Avoid arithmetic overflow.
	99	* Assuming unit is constant and non-zero, this "if" statement
	100	* will go away on 64bit archs.
	101	*/
	102	if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
	103	return LONG_MAX / unit;
	104
	105	return timeout;
	106	}
	107
	108	static inline int addrconf_finite_timeout(unsigned long timeout)
	109	{
	110	return ~timeout;
	111	}
	112
2a8cc6c8 YH	113	/*
	114	* IPv6 Address Label subsystem (addrlabel.c)
	115	*/
e8e54d3c JP	116	int ipv6_addr_label_init(void);
	117	void ipv6_addr_label_cleanup(void);
	118	void ipv6_addr_label_rtnl_register(void);
	119	u32 ipv6_addr_label(struct net net, const struct in6_addr addr,
	120	int type, int ifindex);
2a8cc6c8	121
1da177e4 LT	122	/*
	123	* multicast prototypes (mcast.c)
	124	*/
e8e54d3c JP	125	int ipv6_sock_mc_join(struct sock *sk, int ifindex,
	126	const struct in6_addr *addr);
	127	int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
	128	const struct in6_addr *addr);
	129	void ipv6_sock_mc_close(struct sock *sk);
	130	bool inet6_mc_check(struct sock sk, const struct in6_addr mc_addr,
	131	const struct in6_addr *src_addr);
	132
	133	int ipv6_dev_mc_inc(struct net_device dev, const struct in6_addr addr);
	134	int __ipv6_dev_mc_dec(struct inet6_dev idev, const struct in6_addr addr);
	135	int ipv6_dev_mc_dec(struct net_device dev, const struct in6_addr addr);
	136	void ipv6_mc_up(struct inet6_dev *idev);
	137	void ipv6_mc_down(struct inet6_dev *idev);
	138	void ipv6_mc_unmap(struct inet6_dev *idev);
	139	void ipv6_mc_remap(struct inet6_dev *idev);
	140	void ipv6_mc_init_dev(struct inet6_dev *idev);
	141	void ipv6_mc_destroy_dev(struct inet6_dev *idev);
	142	void addrconf_dad_failure(struct inet6_ifaddr *ifp);
	143
	144	bool ipv6_chk_mcast_addr(struct net_device dev, const struct in6_addr group,
	145	const struct in6_addr *src_addr);
	146
	147	void ipv6_mc_dad_complete(struct inet6_dev *idev);
5f81bd2e CW	148
	149	/* A stub used by vxlan module. This is ugly, ideally these
	150	* symbols should be built into the core kernel.
	151	*/
	152	struct ipv6_stub {
	153	int (ipv6_sock_mc_join)(struct sock sk, int ifindex,
	154	const struct in6_addr *addr);
	155	int (ipv6_sock_mc_drop)(struct sock sk, int ifindex,
	156	const struct in6_addr *addr);
	157	int (ipv6_dst_lookup)(struct sock sk, struct dst_entry **dst,
	158	struct flowi6 *fl6);
	159	void (*udpv6_encap_enable)(void);
f564f45c CW	160	void (ndisc_send_na)(struct net_device dev, struct neighbour *neigh,
	161	const struct in6_addr *daddr,
	162	const struct in6_addr *solicited_addr,
	163	bool router, bool solicited, bool override, bool inc_opt);
e15a00aa	164	struct neigh_table *nd_tbl;
5f81bd2e CW	165	};
	166	extern const struct ipv6_stub *ipv6_stub __read_mostly;
	167
daad1512 YH	168	/*
	169	* identify MLD packets for MLD filter exceptions
	170	*/
	171	static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
	172	{
	173	struct icmp6hdr *hdr;
	174
	175	if (nexthdr != IPPROTO_ICMPV6 \|\|
	176	!pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
	177	return false;
	178
	179	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
	180
	181	switch (hdr->icmp6_type) {
	182	case ICMPV6_MGM_QUERY:
	183	case ICMPV6_MGM_REPORT:
	184	case ICMPV6_MGM_REDUCTION:
	185	case ICMPV6_MLD2_REPORT:
	186	return true;
	187	default:
	188	break;
	189	}
	190	return false;
	191	}
1da177e4	192
e8e54d3c JP	193	void addrconf_prefix_rcv(struct net_device *dev,
e8e54d3c JP	194	u8 *opt, int len, bool sllao);
1da177e4	195
1da177e4 LT	196	/*
	197	* anycast prototypes (anycast.c)
	198	*/
e8e54d3c JP	199	int ipv6_sock_ac_join(struct sock *sk, int ifindex,
	200	const struct in6_addr *addr);
	201	int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
	202	const struct in6_addr *addr);
	203	void ipv6_sock_ac_close(struct sock *sk);
	204
	205	int ipv6_dev_ac_inc(struct net_device dev, const struct in6_addr addr);
	206	int __ipv6_dev_ac_dec(struct inet6_dev idev, const struct in6_addr addr);
	207	bool ipv6_chk_acast_addr(struct net net, struct net_device dev,
7c90cc2d FLB	208	const struct in6_addr *addr);
	209	bool ipv6_chk_acast_addr_src(struct net net, struct net_device dev,
	210	const struct in6_addr *addr);
1da177e4 LT	211
1da177e4 LT	212	/* Device notifier */
e8e54d3c JP	213	int register_inet6addr_notifier(struct notifier_block *nb);
	214	int unregister_inet6addr_notifier(struct notifier_block *nb);
	215	int inet6addr_notifier_call_chain(unsigned long val, void *v);
1da177e4	216
e8e54d3c JP	217	void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
e8e54d3c JP	218	struct ipv6_devconf *devconf);
d67b8c61	219
48daa3bb ED	220	/**
	221	* __in6_dev_get - get inet6_dev pointer from netdevice
	222	* @dev: network device
	223	*
	224	* Caller must hold rcu_read_lock or RTNL, because this function
	225	* does not take a reference on the inet6_dev.
	226	*/
	227	static inline struct inet6_dev __in6_dev_get(const struct net_device dev)
1da177e4	228	{
48daa3bb	229	return rcu_dereference_rtnl(dev->ip6_ptr);
1da177e4 LT	230	}
1da177e4 LT	231
48daa3bb ED	232	/**
	233	* in6_dev_get - get inet6_dev pointer from netdevice
	234	* @dev: network device
	235	*
	236	* This version can be used in any context, and takes a reference
	237	* on the inet6_dev. Callers must use in6_dev_put() later to
	238	* release this reference.
	239	*/
	240	static inline struct inet6_dev in6_dev_get(const struct net_device dev)
1da177e4	241	{
48daa3bb ED	242	struct inet6_dev *idev;
48daa3bb ED	243
8814c4b5	244	rcu_read_lock();
48daa3bb	245	idev = rcu_dereference(dev->ip6_ptr);
1da177e4 LT	246	if (idev)
1da177e4 LT	247	atomic_inc(&idev->refcnt);
8814c4b5	248	rcu_read_unlock();
1da177e4 LT	249	return idev;
	250	}
	251
bba24896 JP	252	static inline struct neigh_parms __in6_dev_nd_parms_get_rcu(const struct net_device dev)
	253	{
	254	struct inet6_dev *idev = __in6_dev_get(dev);
	255
	256	return idev ? idev->nd_parms : NULL;
	257	}
	258
e8e54d3c	259	void in6_dev_finish_destroy(struct inet6_dev *idev);
1da177e4	260
48daa3bb	261	static inline void in6_dev_put(struct inet6_dev *idev)
1da177e4 LT	262	{
	263	if (atomic_dec_and_test(&idev->refcnt))
	264	in6_dev_finish_destroy(idev);
	265	}
	266
48daa3bb ED	267	static inline void __in6_dev_put(struct inet6_dev *idev)
	268	{
	269	atomic_dec(&idev->refcnt);
	270	}
1da177e4	271
48daa3bb ED	272	static inline void in6_dev_hold(struct inet6_dev *idev)
	273	{
	274	atomic_inc(&idev->refcnt);
	275	}
1da177e4	276
e8e54d3c	277	void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
1da177e4 LT	278
	279	static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
	280	{
	281	if (atomic_dec_and_test(&ifp->refcnt))
	282	inet6_ifa_finish_destroy(ifp);
	283	}
	284
48daa3bb ED	285	static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
	286	{
	287	atomic_dec(&ifp->refcnt);
	288	}
1da177e4	289
48daa3bb ED	290	static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
	291	{
	292	atomic_inc(&ifp->refcnt);
	293	}
1da177e4	294
1da177e4 LT	295
	296	/*
	297	* compute link-local solicited-node multicast address
	298	*/
	299
	300	static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
	301	struct in6_addr *solicited)
	302	{
	303	ipv6_addr_set(solicited,
0e7b8dcd YH	304	htonl(0xFF020000), 0,
	305	htonl(0x1),
	306	htonl(0xFF000000) \| addr->s6_addr32[3]);
1da177e4 LT	307	}
1da177e4 LT	308
b27b28cb	309	static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
1da177e4	310	{
0e7b8dcd	311	return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
1da177e4 LT	312	}
1da177e4 LT	313
b27b28cb	314	static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
1da177e4	315	{
d1641565	316	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959	317	__be64 p = (__be64 )addr;
d1641565 YH	318	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(1))) == 0UL;
d1641565 YH	319	#else
48daa3bb	320	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	321	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	322	(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
d1641565	323	#endif
1da177e4 LT	324	}
1da177e4 LT	325
b27b28cb	326	static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
1da177e4	327	{
d1641565	328	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959	329	__be64 p = (__be64 )addr;
d1641565 YH	330	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(2))) == 0UL;
d1641565 YH	331	#else
48daa3bb	332	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	333	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	334	(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
d1641565	335	#endif
1da177e4 LT	336	}
1da177e4 LT	337
b27b28cb	338	static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
c7dc89c0	339	{
48daa3bb	340	return (addr->s6_addr32[2] \| htonl(0x02000000)) == htonl(0x02005EFE);
c7dc89c0 FT	341	}
c7dc89c0 FT	342
ca97a644 YH	343	static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
ca97a644 YH	344	{
9d100774	345	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959	346	__be64 p = (__be64 )addr;
9d100774 YH	347	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	348	((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
	349	cpu_to_be64(0xffffffffff000000UL))) == 0UL;
	350	#else
	351	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	352	addr->s6_addr32[1] \|
	353	(addr->s6_addr32[2] ^ htonl(0x00000001)) \|
	354	(addr->s6_addr[12] ^ 0xff)) == 0;
	355	#endif
ca97a644 YH	356	}
ca97a644 YH	357
20380731	358	#ifdef CONFIG_PROC_FS
e8e54d3c JP	359	int if6_proc_init(void);
e8e54d3c JP	360	void if6_proc_exit(void);
20380731 ACM	361	#endif
20380731 ACM	362
1da177e4	363	#endif