[linux-block.git] / include / net / addrconf.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ADDRCONF_H
#define _ADDRCONF_H

#define MAX_RTR_SOLICITATIONS		-1		/* unlimited */
#define RTR_SOLICITATION_INTERVAL	(4*HZ)
#define RTR_SOLICITATION_MAX_INTERVAL	(3600*HZ)	/* 1 hour */

#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)

#define ADDRCONF_NOTIFY_PRIORITY	0

#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>

struct in6_validator_info {
	struct in6_addr		i6vi_addr;
	struct inet6_dev	*i6vi_dev;
	struct netlink_ext_ack	*extack;
};

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);
int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
			    const struct net_device *dev, int strict,
			    u32 banned_flags);

#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);
bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
			  bool match_wildcard);
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);

void addrconf_add_linklocal(struct inet6_dev *idev,
			    const struct in6_addr *addr, u32 flags);

int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
				 const struct prefix_info *pinfo,
				 struct inet6_dev *in6_dev,
				 const struct in6_addr *addr, int addr_type,
				 u32 addr_flags, bool sllao, bool tokenized,
				 __u32 valid_lft, u32 prefered_lft);

static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
{
	memcpy(eui, addr, 3);
	eui[3] = 0xFF;
	eui[4] = 0xFE;
	memcpy(eui + 5, addr + 3, 3);
}

static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
{
	addrconf_addr_eui48_base(eui, addr);
	eui[0] ^= 2;
}

static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
{
	if (dev->addr_len != ETH_ALEN)
		return -1;

	/*
	 * The zSeries OSA network cards can be shared among various
	 * OS instances, but the OSA cards have only one MAC address.
	 * This leads to duplicate address conflicts in conjunction
	 * with IPv6 if more than one instance uses the same card.
	 *
	 * The driver for these cards can deliver a unique 16-bit
	 * identifier for each instance sharing the same card.  It is
	 * placed instead of 0xFFFE in the interface identifier.  The
	 * "u" bit of the interface identifier is not inverted in this
	 * case.  Hence the resulting interface identifier has local
	 * scope according to RFC2373.
	 */

	addrconf_addr_eui48_base(eui, dev->dev_addr);

	if (dev->dev_id) {
		eui[3] = (dev->dev_id >> 8) & 0xFF;
		eui[4] = dev->dev_id & 0xFF;
	} else {
		eui[0] ^= 2;
	}

	return 0;
}

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);
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);
int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
void addrconf_dad_failure(struct sk_buff *skb, 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 net *net, struct sock *sk,
			       struct dst_entry **dst, struct flowi6 *fl6);
	void (*udpv6_encap_enable)(void);
	void (*ndisc_send_na)(struct net_device *dev, 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 inet6_dev *idev, const struct in6_addr *addr);
int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
void ipv6_ac_destroy_dev(struct inet6_dev *idev);
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);

int register_inet6addr_validator_notifier(struct notifier_block *nb);
int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);

void inet6_netconf_notify_devconf(struct net *net, int event, 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)
		refcount_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 (refcount_dec_and_test(&idev->refcnt))
		in6_dev_finish_destroy(idev);
}

static inline void in6_dev_put_clear(struct inet6_dev **pidev)
{
	struct inet6_dev *idev = *pidev;

	if (idev) {
		in6_dev_put(idev);
		*pidev = NULL;
	}
}

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

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

void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);

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

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

static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
{
	refcount_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_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
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _ADDRCONF_H
	3	#define _ADDRCONF_H
	4
	5	#define MAX_RTR_SOLICITATIONS -1 /* unlimited */
	6	#define RTR_SOLICITATION_INTERVAL (4*HZ)
	7	#define RTR_SOLICITATION_MAX_INTERVAL (3600HZ) / 1 hour */
	8
	9	#define MIN_VALID_LIFETIME (23600) / 2 hours */
	10
	11	#define TEMP_VALID_LIFETIME (7*86400)
	12	#define TEMP_PREFERRED_LIFETIME (86400)
	13	#define REGEN_MAX_RETRY (3)
	14	#define MAX_DESYNC_FACTOR (600)
	15
	16	#define ADDR_CHECK_FREQUENCY (120*HZ)
	17
	18	#define IPV6_MAX_ADDRESSES 16
	19
	20	#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
	21	#define ADDRCONF_TIMER_FUZZ (HZ / 4)
	22	#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
	23
	24	#define ADDRCONF_NOTIFY_PRIORITY 0
	25
	26	#include <linux/in.h>
	27	#include <linux/in6.h>
	28
	29	struct prefix_info {
	30	__u8 type;
	31	__u8 length;
	32	__u8 prefix_len;
	33
	34	#if defined(__BIG_ENDIAN_BITFIELD)
	35	__u8 onlink : 1,
	36	autoconf : 1,
	37	reserved : 6;
	38	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	39	__u8 reserved : 6,
	40	autoconf : 1,
	41	onlink : 1;
	42	#else
	43	#error "Please fix <asm/byteorder.h>"
	44	#endif
	45	__be32 valid;
	46	__be32 prefered;
	47	__be32 reserved2;
	48
	49	struct in6_addr prefix;
	50	};
	51
	52	#include <linux/netdevice.h>
	53	#include <net/if_inet6.h>
	54	#include <net/ipv6.h>
	55
	56	struct in6_validator_info {
	57	struct in6_addr i6vi_addr;
	58	struct inet6_dev *i6vi_dev;
	59	struct netlink_ext_ack *extack;
	60	};
	61
	62	int addrconf_init(void);
	63	void addrconf_cleanup(void);
	64
	65	int addrconf_add_ifaddr(struct net net, void __user arg);
	66	int addrconf_del_ifaddr(struct net net, void __user arg);
	67	int addrconf_set_dstaddr(struct net net, void __user arg);
	68
	69	int ipv6_chk_addr(struct net net, const struct in6_addr addr,
	70	const struct net_device *dev, int strict);
	71	int ipv6_chk_addr_and_flags(struct net net, const struct in6_addr addr,
	72	const struct net_device *dev, int strict,
	73	u32 banned_flags);
	74
	75	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
	76	int ipv6_chk_home_addr(struct net net, const struct in6_addr addr);
	77	#endif
	78
	79	bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
	80	const unsigned int prefix_len,
	81	struct net_device *dev);
	82
	83	int ipv6_chk_prefix(const struct in6_addr addr, struct net_device dev);
	84
	85	struct inet6_ifaddr ipv6_get_ifaddr(struct net net,
	86	const struct in6_addr *addr,
	87	struct net_device *dev, int strict);
	88
	89	int ipv6_dev_get_saddr(struct net net, const struct net_device dev,
	90	const struct in6_addr *daddr, unsigned int srcprefs,
	91	struct in6_addr *saddr);
	92	int __ipv6_get_lladdr(struct inet6_dev idev, struct in6_addr addr,
	93	u32 banned_flags);
	94	int ipv6_get_lladdr(struct net_device dev, struct in6_addr addr,
	95	u32 banned_flags);
	96	bool inet_rcv_saddr_equal(const struct sock sk, const struct sock sk2,
	97	bool match_wildcard);
	98	void addrconf_join_solict(struct net_device dev, const struct in6_addr addr);
	99	void addrconf_leave_solict(struct inet6_dev idev, const struct in6_addr addr);
	100
	101	void addrconf_add_linklocal(struct inet6_dev *idev,
	102	const struct in6_addr *addr, u32 flags);
	103
	104	int addrconf_prefix_rcv_add_addr(struct net net, struct net_device dev,
	105	const struct prefix_info *pinfo,
	106	struct inet6_dev *in6_dev,
	107	const struct in6_addr *addr, int addr_type,
	108	u32 addr_flags, bool sllao, bool tokenized,
	109	__u32 valid_lft, u32 prefered_lft);
	110
	111	static inline void addrconf_addr_eui48_base(u8 eui, const char const addr)
	112	{
	113	memcpy(eui, addr, 3);
	114	eui[3] = 0xFF;
	115	eui[4] = 0xFE;
	116	memcpy(eui + 5, addr + 3, 3);
	117	}
	118
	119	static inline void addrconf_addr_eui48(u8 eui, const char const addr)
	120	{
	121	addrconf_addr_eui48_base(eui, addr);
	122	eui[0] ^= 2;
	123	}
	124
	125	static inline int addrconf_ifid_eui48(u8 eui, struct net_device dev)
	126	{
	127	if (dev->addr_len != ETH_ALEN)
	128	return -1;
	129
	130	/*
	131	* The zSeries OSA network cards can be shared among various
	132	* OS instances, but the OSA cards have only one MAC address.
	133	* This leads to duplicate address conflicts in conjunction
	134	* with IPv6 if more than one instance uses the same card.
	135	*
	136	* The driver for these cards can deliver a unique 16-bit
	137	* identifier for each instance sharing the same card. It is
	138	* placed instead of 0xFFFE in the interface identifier. The
	139	* "u" bit of the interface identifier is not inverted in this
	140	* case. Hence the resulting interface identifier has local
	141	* scope according to RFC2373.
	142	*/
	143
	144	addrconf_addr_eui48_base(eui, dev->dev_addr);
	145
	146	if (dev->dev_id) {
	147	eui[3] = (dev->dev_id >> 8) & 0xFF;
	148	eui[4] = dev->dev_id & 0xFF;
	149	} else {
	150	eui[0] ^= 2;
	151	}
	152
	153	return 0;
	154	}
	155
	156	static inline unsigned long addrconf_timeout_fixup(u32 timeout,
	157	unsigned int unit)
	158	{
	159	if (timeout == 0xffffffff)
	160	return ~0UL;
	161
	162	/*
	163	* Avoid arithmetic overflow.
	164	* Assuming unit is constant and non-zero, this "if" statement
	165	* will go away on 64bit archs.
	166	*/
	167	if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
	168	return LONG_MAX / unit;
	169
	170	return timeout;
	171	}
	172
	173	static inline int addrconf_finite_timeout(unsigned long timeout)
	174	{
	175	return ~timeout;
	176	}
	177
	178	/*
	179	* IPv6 Address Label subsystem (addrlabel.c)
	180	*/
	181	int ipv6_addr_label_init(void);
	182	void ipv6_addr_label_cleanup(void);
	183	void ipv6_addr_label_rtnl_register(void);
	184	u32 ipv6_addr_label(struct net net, const struct in6_addr addr,
	185	int type, int ifindex);
	186
	187	/*
	188	* multicast prototypes (mcast.c)
	189	*/
	190	int ipv6_sock_mc_join(struct sock *sk, int ifindex,
	191	const struct in6_addr *addr);
	192	int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
	193	const struct in6_addr *addr);
	194	void __ipv6_sock_mc_close(struct sock *sk);
	195	void ipv6_sock_mc_close(struct sock *sk);
	196	bool inet6_mc_check(struct sock sk, const struct in6_addr mc_addr,
	197	const struct in6_addr *src_addr);
	198
	199	int ipv6_dev_mc_inc(struct net_device dev, const struct in6_addr addr);
	200	int __ipv6_dev_mc_dec(struct inet6_dev idev, const struct in6_addr addr);
	201	int ipv6_dev_mc_dec(struct net_device dev, const struct in6_addr addr);
	202	void ipv6_mc_up(struct inet6_dev *idev);
	203	void ipv6_mc_down(struct inet6_dev *idev);
	204	void ipv6_mc_unmap(struct inet6_dev *idev);
	205	void ipv6_mc_remap(struct inet6_dev *idev);
	206	void ipv6_mc_init_dev(struct inet6_dev *idev);
	207	void ipv6_mc_destroy_dev(struct inet6_dev *idev);
	208	int ipv6_mc_check_mld(struct sk_buff skb, struct sk_buff *skb_trimmed);
	209	void addrconf_dad_failure(struct sk_buff skb, struct inet6_ifaddr ifp);
	210
	211	bool ipv6_chk_mcast_addr(struct net_device dev, const struct in6_addr group,
	212	const struct in6_addr *src_addr);
	213
	214	void ipv6_mc_dad_complete(struct inet6_dev *idev);
	215
	216	/* A stub used by vxlan module. This is ugly, ideally these
	217	* symbols should be built into the core kernel.
	218	*/
	219	struct ipv6_stub {
	220	int (ipv6_sock_mc_join)(struct sock sk, int ifindex,
	221	const struct in6_addr *addr);
	222	int (ipv6_sock_mc_drop)(struct sock sk, int ifindex,
	223	const struct in6_addr *addr);
	224	int (ipv6_dst_lookup)(struct net net, struct sock *sk,
	225	struct dst_entry *dst, struct flowi6 fl6);
	226	void (*udpv6_encap_enable)(void);
	227	void (ndisc_send_na)(struct net_device dev, const struct in6_addr *daddr,
	228	const struct in6_addr *solicited_addr,
	229	bool router, bool solicited, bool override, bool inc_opt);
	230	struct neigh_table *nd_tbl;
	231	};
	232	extern const struct ipv6_stub *ipv6_stub __read_mostly;
	233
	234	/*
	235	* identify MLD packets for MLD filter exceptions
	236	*/
	237	static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
	238	{
	239	struct icmp6hdr *hdr;
	240
	241	if (nexthdr != IPPROTO_ICMPV6 \|\|
	242	!pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
	243	return false;
	244
	245	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
	246
	247	switch (hdr->icmp6_type) {
	248	case ICMPV6_MGM_QUERY:
	249	case ICMPV6_MGM_REPORT:
	250	case ICMPV6_MGM_REDUCTION:
	251	case ICMPV6_MLD2_REPORT:
	252	return true;
	253	default:
	254	break;
	255	}
	256	return false;
	257	}
	258
	259	void addrconf_prefix_rcv(struct net_device *dev,
	260	u8 *opt, int len, bool sllao);
	261
	262	/*
	263	* anycast prototypes (anycast.c)
	264	*/
	265	int ipv6_sock_ac_join(struct sock *sk, int ifindex,
	266	const struct in6_addr *addr);
	267	int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
	268	const struct in6_addr *addr);
	269	void ipv6_sock_ac_close(struct sock *sk);
	270
	271	int __ipv6_dev_ac_inc(struct inet6_dev idev, const struct in6_addr addr);
	272	int __ipv6_dev_ac_dec(struct inet6_dev idev, const struct in6_addr addr);
	273	void ipv6_ac_destroy_dev(struct inet6_dev *idev);
	274	bool ipv6_chk_acast_addr(struct net net, struct net_device dev,
	275	const struct in6_addr *addr);
	276	bool ipv6_chk_acast_addr_src(struct net net, struct net_device dev,
	277	const struct in6_addr *addr);
	278
	279	/* Device notifier */
	280	int register_inet6addr_notifier(struct notifier_block *nb);
	281	int unregister_inet6addr_notifier(struct notifier_block *nb);
	282	int inet6addr_notifier_call_chain(unsigned long val, void *v);
	283
	284	int register_inet6addr_validator_notifier(struct notifier_block *nb);
	285	int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
	286	int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
	287
	288	void inet6_netconf_notify_devconf(struct net *net, int event, int type,
	289	int ifindex, struct ipv6_devconf *devconf);
	290
	291	/**
	292	* __in6_dev_get - get inet6_dev pointer from netdevice
	293	* @dev: network device
	294	*
	295	* Caller must hold rcu_read_lock or RTNL, because this function
	296	* does not take a reference on the inet6_dev.
	297	*/
	298	static inline struct inet6_dev __in6_dev_get(const struct net_device dev)
	299	{
	300	return rcu_dereference_rtnl(dev->ip6_ptr);
	301	}
	302
	303	/**
	304	* in6_dev_get - get inet6_dev pointer from netdevice
	305	* @dev: network device
	306	*
	307	* This version can be used in any context, and takes a reference
	308	* on the inet6_dev. Callers must use in6_dev_put() later to
	309	* release this reference.
	310	*/
	311	static inline struct inet6_dev in6_dev_get(const struct net_device dev)
	312	{
	313	struct inet6_dev *idev;
	314
	315	rcu_read_lock();
	316	idev = rcu_dereference(dev->ip6_ptr);
	317	if (idev)
	318	refcount_inc(&idev->refcnt);
	319	rcu_read_unlock();
	320	return idev;
	321	}
	322
	323	static inline struct neigh_parms __in6_dev_nd_parms_get_rcu(const struct net_device dev)
	324	{
	325	struct inet6_dev *idev = __in6_dev_get(dev);
	326
	327	return idev ? idev->nd_parms : NULL;
	328	}
	329
	330	void in6_dev_finish_destroy(struct inet6_dev *idev);
	331
	332	static inline void in6_dev_put(struct inet6_dev *idev)
	333	{
	334	if (refcount_dec_and_test(&idev->refcnt))
	335	in6_dev_finish_destroy(idev);
	336	}
	337
	338	static inline void in6_dev_put_clear(struct inet6_dev **pidev)
	339	{
	340	struct inet6_dev idev = pidev;
	341
	342	if (idev) {
	343	in6_dev_put(idev);
	344	*pidev = NULL;
	345	}
	346	}
	347
	348	static inline void __in6_dev_put(struct inet6_dev *idev)
	349	{
	350	refcount_dec(&idev->refcnt);
	351	}
	352
	353	static inline void in6_dev_hold(struct inet6_dev *idev)
	354	{
	355	refcount_inc(&idev->refcnt);
	356	}
	357
	358	void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
	359
	360	static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
	361	{
	362	if (refcount_dec_and_test(&ifp->refcnt))
	363	inet6_ifa_finish_destroy(ifp);
	364	}
	365
	366	static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
	367	{
	368	refcount_dec(&ifp->refcnt);
	369	}
	370
	371	static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
	372	{
	373	refcount_inc(&ifp->refcnt);
	374	}
	375
	376
	377	/*
	378	* compute link-local solicited-node multicast address
	379	*/
	380
	381	static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
	382	struct in6_addr *solicited)
	383	{
	384	ipv6_addr_set(solicited,
	385	htonl(0xFF020000), 0,
	386	htonl(0x1),
	387	htonl(0xFF000000) \| addr->s6_addr32[3]);
	388	}
	389
	390	static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
	391	{
	392	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	393	__be64 p = (__be64 )addr;
	394	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(1))) == 0UL;
	395	#else
	396	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	397	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
	398	(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
	399	#endif
	400	}
	401
	402	static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
	403	{
	404	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	405	__be64 p = (__be64 )addr;
	406	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(2))) == 0UL;
	407	#else
	408	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	409	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
	410	(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
	411	#endif
	412	}
	413
	414	static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
	415	{
	416	return (addr->s6_addr32[2] \| htonl(0x02000000)) == htonl(0x02005EFE);
	417	}
	418
	419	static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
	420	{
	421	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	422	__be64 p = (__be64 )addr;
	423	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	424	((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
	425	cpu_to_be64(0xffffffffff000000UL))) == 0UL;
	426	#else
	427	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	428	addr->s6_addr32[1] \|
	429	(addr->s6_addr32[2] ^ htonl(0x00000001)) \|
	430	(addr->s6_addr[12] ^ 0xff)) == 0;
	431	#endif
	432	}
	433
	434	#ifdef CONFIG_PROC_FS
	435	int if6_proc_init(void);
	436	void if6_proc_exit(void);
	437	#endif
	438
	439	#endif