[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, bool skip_dev_check,
			    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);
int 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;

/* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
struct ipv6_bpf_stub {
	int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
			  bool force_bind_address_no_port, bool with_lock);
};
extern const struct ipv6_bpf_stub *ipv6_bpf_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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _ADDRCONF_H
	3	#define _ADDRCONF_H
	4
bd11f074	5	#define MAX_RTR_SOLICITATIONS -1 /* unlimited */
1da177e4	6	#define RTR_SOLICITATION_INTERVAL (4*HZ)
bd11f074	7	#define RTR_SOLICITATION_MAX_INTERVAL (3600HZ) / 1 hour */
1da177e4 LT	8
	9	#define MIN_VALID_LIFETIME (23600) / 2 hours */
	10
	11	#define TEMP_VALID_LIFETIME (7*86400)
	12	#define TEMP_PREFERRED_LIFETIME (86400)
76f793e3	13	#define REGEN_MAX_RETRY (3)
1da177e4 LT	14	#define MAX_DESYNC_FACTOR (600)
	15
	16	#define ADDR_CHECK_FREQUENCY (120*HZ)
	17
	18	#define IPV6_MAX_ADDRESSES 16
	19
5c766d64 JP	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
242d3a49 WC	24	#define ADDRCONF_NOTIFY_PRIORITY 0
242d3a49 WC	25
c7dc89c0	26	#include <linux/in.h>
6a800d45 PM	27	#include <linux/in6.h>
6a800d45 PM	28
1da177e4 LT	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
e69a4adc AV	45	__be32 valid;
	46	__be32 prefered;
	47	__be32 reserved2;
1da177e4 LT	48
	49	struct in6_addr prefix;
	50	};
	51
1da177e4 LT	52	#include <linux/netdevice.h>
1da177e4 LT	53	#include <net/if_inet6.h>
e4553edd	54	#include <net/ipv6.h>
1da177e4	55
3ad7d246 KJ	56	struct in6_validator_info {
	57	struct in6_addr i6vi_addr;
	58	struct inet6_dev *i6vi_dev;
de95e047	59	struct netlink_ext_ack *extack;
3ad7d246 KJ	60	};
3ad7d246 KJ	61
e8e54d3c JP	62	int addrconf_init(void);
e8e54d3c JP	63	void addrconf_cleanup(void);
1da177e4	64
e8e54d3c JP	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);
1da177e4	68
e8e54d3c JP	69	int ipv6_chk_addr(struct net net, const struct in6_addr addr,
e8e54d3c JP	70	const struct net_device *dev, int strict);
c58da4c6	71	int ipv6_chk_addr_and_flags(struct net net, const struct in6_addr addr,
232378e8 DA	72	const struct net_device *dev, bool skip_dev_check,
232378e8 DA	73	int strict, u32 banned_flags);
bfeade08	74
59fbb3a6	75	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
e8e54d3c	76	int ipv6_chk_home_addr(struct net net, const struct in6_addr addr);
65d4ed92	77	#endif
52eeeb84	78
7df37ff3 CB	79	bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
	80	const unsigned int prefix_len,
	81	struct net_device *dev);
	82
e8e54d3c JP	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,
479840ff	93	u32 banned_flags);
e8e54d3c	94	int ipv6_get_lladdr(struct net_device dev, struct in6_addr addr,
479840ff	95	u32 banned_flags);
7016e062 JP	96	bool inet_rcv_saddr_equal(const struct sock sk, const struct sock sk2,
7016e062 JP	97	bool match_wildcard);
e8e54d3c JP	98	void addrconf_join_solict(struct net_device dev, const struct in6_addr addr);
e8e54d3c JP	99	void addrconf_leave_solict(struct inet6_dev idev, const struct in6_addr addr);
1da177e4	100
2ad3ed59 AA	101	void addrconf_add_linklocal(struct inet6_dev *idev,
	102	const struct in6_addr *addr, u32 flags);
	103
cc84b3c6 AA	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
4d6f2859 YS	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
399e6f95 MB	125	static inline int addrconf_ifid_eui48(u8 eui, struct net_device dev)
	126	{
	127	if (dev->addr_len != ETH_ALEN)
	128	return -1;
399e6f95 MB	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	*/
4d6f2859 YS	143
	144	addrconf_addr_eui48_base(eui, dev->dev_addr);
	145
399e6f95 MB	146	if (dev->dev_id) {
	147	eui[3] = (dev->dev_id >> 8) & 0xFF;
	148	eui[4] = dev->dev_id & 0xFF;
	149	} else {
399e6f95 MB	150	eui[0] ^= 2;
399e6f95 MB	151	}
4d6f2859	152
399e6f95 MB	153	return 0;
	154	}
	155
4bed72e4	156	static inline unsigned long addrconf_timeout_fixup(u32 timeout,
95c96174	157	unsigned int unit)
4bed72e4 YH	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
2a8cc6c8 YH	178	/*
	179	* IPv6 Address Label subsystem (addrlabel.c)
	180	*/
e8e54d3c JP	181	int ipv6_addr_label_init(void);
e8e54d3c JP	182	void ipv6_addr_label_cleanup(void);
a3fde2ad	183	int ipv6_addr_label_rtnl_register(void);
e8e54d3c JP	184	u32 ipv6_addr_label(struct net net, const struct in6_addr addr,
e8e54d3c JP	185	int type, int ifindex);
2a8cc6c8	186
1da177e4 LT	187	/*
	188	* multicast prototypes (mcast.c)
	189	*/
e8e54d3c JP	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);
8651be8f	194	void __ipv6_sock_mc_close(struct sock *sk);
e8e54d3c JP	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);
9afd85c9	208	int ipv6_mc_check_mld(struct sk_buff skb, struct sk_buff *skb_trimmed);
da13c59b	209	void addrconf_dad_failure(struct sk_buff skb, struct inet6_ifaddr ifp);
e8e54d3c JP	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);
5f81bd2e CW	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);
343d60aa RP	224	int (ipv6_dst_lookup)(struct net net, struct sock *sk,
343d60aa RP	225	struct dst_entry *dst, struct flowi6 fl6);
5f81bd2e	226	void (*udpv6_encap_enable)(void);
38cf595b	227	void (ndisc_send_na)(struct net_device dev, const struct in6_addr *daddr,
f564f45c CW	228	const struct in6_addr *solicited_addr,
f564f45c CW	229	bool router, bool solicited, bool override, bool inc_opt);
e15a00aa	230	struct neigh_table *nd_tbl;
5f81bd2e CW	231	};
	232	extern const struct ipv6_stub *ipv6_stub __read_mostly;
	233
d74bad4e AI	234	/* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
	235	struct ipv6_bpf_stub {
	236	int (inet6_bind)(struct sock sk, struct sockaddr *uaddr, int addr_len,
	237	bool force_bind_address_no_port, bool with_lock);
	238	};
	239	extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
	240
daad1512 YH	241	/*
	242	* identify MLD packets for MLD filter exceptions
	243	*/
	244	static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
	245	{
	246	struct icmp6hdr *hdr;
	247
	248	if (nexthdr != IPPROTO_ICMPV6 \|\|
	249	!pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
	250	return false;
	251
	252	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
	253
	254	switch (hdr->icmp6_type) {
	255	case ICMPV6_MGM_QUERY:
	256	case ICMPV6_MGM_REPORT:
	257	case ICMPV6_MGM_REDUCTION:
	258	case ICMPV6_MLD2_REPORT:
	259	return true;
	260	default:
	261	break;
	262	}
	263	return false;
	264	}
1da177e4	265
e8e54d3c JP	266	void addrconf_prefix_rcv(struct net_device *dev,
e8e54d3c JP	267	u8 *opt, int len, bool sllao);
1da177e4	268
1da177e4 LT	269	/*
	270	* anycast prototypes (anycast.c)
	271	*/
e8e54d3c JP	272	int ipv6_sock_ac_join(struct sock *sk, int ifindex,
	273	const struct in6_addr *addr);
	274	int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
	275	const struct in6_addr *addr);
	276	void ipv6_sock_ac_close(struct sock *sk);
	277
013b4d90	278	int __ipv6_dev_ac_inc(struct inet6_dev idev, const struct in6_addr addr);
e8e54d3c	279	int __ipv6_dev_ac_dec(struct inet6_dev idev, const struct in6_addr addr);
381f4dca	280	void ipv6_ac_destroy_dev(struct inet6_dev *idev);
e8e54d3c	281	bool ipv6_chk_acast_addr(struct net net, struct net_device dev,
7c90cc2d FLB	282	const struct in6_addr *addr);
	283	bool ipv6_chk_acast_addr_src(struct net net, struct net_device dev,
	284	const struct in6_addr *addr);
1da177e4 LT	285
1da177e4 LT	286	/* Device notifier */
e8e54d3c JP	287	int register_inet6addr_notifier(struct notifier_block *nb);
	288	int unregister_inet6addr_notifier(struct notifier_block *nb);
	289	int inet6addr_notifier_call_chain(unsigned long val, void *v);
1da177e4	290
3ad7d246 KJ	291	int register_inet6addr_validator_notifier(struct notifier_block *nb);
	292	int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
	293	int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
	294
85b3daad DA	295	void inet6_netconf_notify_devconf(struct net *net, int event, int type,
85b3daad DA	296	int ifindex, struct ipv6_devconf *devconf);
d67b8c61	297
48daa3bb ED	298	/**
	299	* __in6_dev_get - get inet6_dev pointer from netdevice
	300	* @dev: network device
	301	*
	302	* Caller must hold rcu_read_lock or RTNL, because this function
	303	* does not take a reference on the inet6_dev.
	304	*/
	305	static inline struct inet6_dev __in6_dev_get(const struct net_device dev)
1da177e4	306	{
48daa3bb	307	return rcu_dereference_rtnl(dev->ip6_ptr);
1da177e4 LT	308	}
1da177e4 LT	309
48daa3bb ED	310	/**
	311	* in6_dev_get - get inet6_dev pointer from netdevice
	312	* @dev: network device
	313	*
	314	* This version can be used in any context, and takes a reference
	315	* on the inet6_dev. Callers must use in6_dev_put() later to
	316	* release this reference.
	317	*/
	318	static inline struct inet6_dev in6_dev_get(const struct net_device dev)
1da177e4	319	{
48daa3bb ED	320	struct inet6_dev *idev;
48daa3bb ED	321
8814c4b5	322	rcu_read_lock();
48daa3bb	323	idev = rcu_dereference(dev->ip6_ptr);
1da177e4	324	if (idev)
1be92460	325	refcount_inc(&idev->refcnt);
8814c4b5	326	rcu_read_unlock();
1da177e4 LT	327	return idev;
	328	}
	329
bba24896 JP	330	static inline struct neigh_parms __in6_dev_nd_parms_get_rcu(const struct net_device dev)
	331	{
	332	struct inet6_dev *idev = __in6_dev_get(dev);
	333
	334	return idev ? idev->nd_parms : NULL;
	335	}
	336
e8e54d3c	337	void in6_dev_finish_destroy(struct inet6_dev *idev);
1da177e4	338
48daa3bb	339	static inline void in6_dev_put(struct inet6_dev *idev)
1da177e4	340	{
1be92460	341	if (refcount_dec_and_test(&idev->refcnt))
1da177e4 LT	342	in6_dev_finish_destroy(idev);
	343	}
	344
12d94a80 ED	345	static inline void in6_dev_put_clear(struct inet6_dev **pidev)
	346	{
	347	struct inet6_dev idev = pidev;
	348
	349	if (idev) {
	350	in6_dev_put(idev);
	351	*pidev = NULL;
	352	}
	353	}
	354
48daa3bb ED	355	static inline void __in6_dev_put(struct inet6_dev *idev)
48daa3bb ED	356	{
1be92460	357	refcount_dec(&idev->refcnt);
48daa3bb	358	}
1da177e4	359
48daa3bb ED	360	static inline void in6_dev_hold(struct inet6_dev *idev)
48daa3bb ED	361	{
1be92460	362	refcount_inc(&idev->refcnt);
48daa3bb	363	}
1da177e4	364
e8e54d3c	365	void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
1da177e4 LT	366
	367	static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
	368	{
271201c0	369	if (refcount_dec_and_test(&ifp->refcnt))
1da177e4 LT	370	inet6_ifa_finish_destroy(ifp);
	371	}
	372
48daa3bb ED	373	static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
48daa3bb ED	374	{
271201c0	375	refcount_dec(&ifp->refcnt);
48daa3bb	376	}
1da177e4	377
48daa3bb ED	378	static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
48daa3bb ED	379	{
271201c0	380	refcount_inc(&ifp->refcnt);
48daa3bb	381	}
1da177e4	382
1da177e4 LT	383
	384	/*
	385	* compute link-local solicited-node multicast address
	386	*/
	387
	388	static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
	389	struct in6_addr *solicited)
	390	{
	391	ipv6_addr_set(solicited,
0e7b8dcd YH	392	htonl(0xFF020000), 0,
	393	htonl(0x1),
	394	htonl(0xFF000000) \| addr->s6_addr32[3]);
1da177e4 LT	395	}
1da177e4 LT	396
b27b28cb	397	static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
1da177e4	398	{
d1641565	399	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959	400	__be64 p = (__be64 )addr;
d1641565 YH	401	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(1))) == 0UL;
d1641565 YH	402	#else
48daa3bb	403	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	404	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	405	(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
d1641565	406	#endif
1da177e4 LT	407	}
1da177e4 LT	408
b27b28cb	409	static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
1da177e4	410	{
d1641565	411	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959	412	__be64 p = (__be64 )addr;
d1641565 YH	413	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(2))) == 0UL;
d1641565 YH	414	#else
48daa3bb	415	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	416	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	417	(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
d1641565	418	#endif
1da177e4 LT	419	}
1da177e4 LT	420
b27b28cb	421	static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
c7dc89c0	422	{
48daa3bb	423	return (addr->s6_addr32[2] \| htonl(0x02000000)) == htonl(0x02005EFE);
c7dc89c0 FT	424	}
c7dc89c0 FT	425
ca97a644 YH	426	static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
ca97a644 YH	427	{
9d100774	428	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959	429	__be64 p = (__be64 )addr;
9d100774 YH	430	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	431	((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
	432	cpu_to_be64(0xffffffffff000000UL))) == 0UL;
	433	#else
	434	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	435	addr->s6_addr32[1] \|
	436	(addr->s6_addr32[2] ^ htonl(0x00000001)) \|
	437	(addr->s6_addr[12] ^ 0xff)) == 0;
	438	#endif
ca97a644 YH	439	}
ca97a644 YH	440
20380731	441	#ifdef CONFIG_PROC_FS
e8e54d3c JP	442	int if6_proc_init(void);
e8e54d3c JP	443	void if6_proc_exit(void);
20380731 ACM	444	#endif
20380731 ACM	445
1da177e4	446	#endif