[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)       /* 1 week */
#define TEMP_PREFERRED_LIFETIME		(86400)         /* 24 hours */
#define REGEN_MIN_ADVANCE		(2)             /* 2 seconds */
#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;

	union __packed {
		__u8		flags;
		struct __packed {
#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;
};

/* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */
static_assert(sizeof(struct prefix_info) == 32);

#include <linux/ipv6.h>
#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;
};

struct ifa6_config {
	const struct in6_addr	*pfx;
	unsigned int		plen;

	u8			ifa_proto;

	const struct in6_addr	*peer_pfx;

	u32			rt_priority;
	u32			ifa_flags;
	u32			preferred_lft;
	u32			valid_lft;
	u16			scope;
};

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

int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
			  unsigned char nsegs);

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 net_device *ipv6_dev_find(struct net *net, 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 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);
bool inet_rcv_saddr_any(const struct sock *sk);
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)
 */
static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
				    unsigned int len)
{
	if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
		return false;

	return pskb_may_pull(skb, len);
}

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(const 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);
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);

/*
 * 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);
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);
int ipv6_anycast_init(void);
void ipv6_anycast_cleanup(void);

/* 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_stats_get - get inet6_dev pointer for stats
 * @dev: network device
 * @skb: skb for original incoming interface if neeeded
 *
 * 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_stats_get(const struct net_device *dev,
						    const struct sk_buff *skb)
{
	if (netif_is_l3_master(dev))
		dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
	return __in6_dev_get(dev);
}

/**
 * __in6_dev_get_safely - get inet6_dev pointer from netdevice
 * @dev: network device
 *
 * This is a safer version of __in6_dev_get
 */
static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
{
	if (likely(dev))
		return rcu_dereference_rtnl(dev->ip6_ptr);
	else
		return NULL;
}

/**
 * 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);
}

/* called with rcu_read_lock held */
static inline bool ip6_ignore_linkdown(const struct net_device *dev)
{
	const struct inet6_dev *idev = __in6_dev_get(dev);

	if (unlikely(!idev))
		return true;

	return !!READ_ONCE(idev->cnf.ignore_routes_with_linkdown);
}

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);
}

static inline bool in6_ifa_hold_safe(struct inet6_ifaddr *ifp)
{
	return refcount_inc_not_zero(&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 = (__force __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 = (__force __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 = (__force __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
}

static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	__be64 *p = (__force __be64 *)addr;

	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
		(p[1] ^ cpu_to_be64(0x6a))) == 0UL;
#else
	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
		addr->s6_addr32[1] | addr->s6_addr32[2] |
		(addr->s6_addr32[3] ^ htonl(0x0000006a))) == 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	8
36268983 GN	9	#define MIN_VALID_LIFETIME (23600) / 2 hours */
36268983 GN	10
a5fcea2d AH	11	#define TEMP_VALID_LIFETIME (786400) / 1 week */
	12	#define TEMP_PREFERRED_LIFETIME (86400) /* 24 hours */
	13	#define REGEN_MIN_ADVANCE (2) /* 2 seconds */
76f793e3	14	#define REGEN_MAX_RETRY (3)
1da177e4 LT	15	#define MAX_DESYNC_FACTOR (600)
	16
	17	#define ADDR_CHECK_FREQUENCY (120*HZ)
	18
	19	#define IPV6_MAX_ADDRESSES 16
	20
5c766d64 JP	21	#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
	22	#define ADDRCONF_TIMER_FUZZ (HZ / 4)
	23	#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
	24
242d3a49 WC	25	#define ADDRCONF_NOTIFY_PRIORITY 0
242d3a49 WC	26
c7dc89c0	27	#include <linux/in.h>
6a800d45 PM	28	#include <linux/in6.h>
6a800d45 PM	29
1da177e4 LT	30	struct prefix_info {
	31	__u8 type;
	32	__u8 length;
	33	__u8 prefix_len;
	34
bd4a8167 MŻ	35	union __packed {
	36	__u8 flags;
	37	struct __packed {
1da177e4	38	#if defined(__BIG_ENDIAN_BITFIELD)
bd4a8167	39	__u8 onlink : 1,
1da177e4 LT	40	autoconf : 1,
	41	reserved : 6;
	42	#elif defined(__LITTLE_ENDIAN_BITFIELD)
bd4a8167	43	__u8 reserved : 6,
1da177e4 LT	44	autoconf : 1,
	45	onlink : 1;
	46	#else
	47	#error "Please fix <asm/byteorder.h>"
	48	#endif
bd4a8167 MŻ	49	};
bd4a8167 MŻ	50	};
e69a4adc AV	51	__be32 valid;
	52	__be32 prefered;
	53	__be32 reserved2;
1da177e4 LT	54
	55	struct in6_addr prefix;
	56	};
	57
bd4a8167 MŻ	58	/* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */
	59	static_assert(sizeof(struct prefix_info) == 32);
	60
ba5ea614	61	#include <linux/ipv6.h>
1da177e4 LT	62	#include <linux/netdevice.h>
1da177e4 LT	63	#include <net/if_inet6.h>
e4553edd	64	#include <net/ipv6.h>
1da177e4	65
3ad7d246 KJ	66	struct in6_validator_info {
	67	struct in6_addr i6vi_addr;
	68	struct inet6_dev *i6vi_dev;
de95e047	69	struct netlink_ext_ack *extack;
3ad7d246 KJ	70	};
3ad7d246 KJ	71
e6464b8c DA	72	struct ifa6_config {
	73	const struct in6_addr *pfx;
	74	unsigned int plen;
	75
47f0bd50 JL	76	u8 ifa_proto;
47f0bd50 JL	77
e6464b8c DA	78	const struct in6_addr *peer_pfx;
e6464b8c DA	79
8308f3ff	80	u32 rt_priority;
e6464b8c DA	81	u32 ifa_flags;
	82	u32 preferred_lft;
	83	u32 valid_lft;
	84	u16 scope;
	85	};
	86
e8e54d3c JP	87	int addrconf_init(void);
e8e54d3c JP	88	void addrconf_cleanup(void);
1da177e4	89
e8e54d3c JP	90	int addrconf_add_ifaddr(struct net net, void __user arg);
	91	int addrconf_del_ifaddr(struct net net, void __user arg);
	92	int addrconf_set_dstaddr(struct net net, void __user arg);
1da177e4	93
e8e54d3c JP	94	int ipv6_chk_addr(struct net net, const struct in6_addr addr,
e8e54d3c JP	95	const struct net_device *dev, int strict);
c58da4c6	96	int ipv6_chk_addr_and_flags(struct net net, const struct in6_addr addr,
232378e8 DA	97	const struct net_device *dev, bool skip_dev_check,
232378e8 DA	98	int strict, u32 banned_flags);
bfeade08	99
59fbb3a6	100	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
e8e54d3c	101	int ipv6_chk_home_addr(struct net net, const struct in6_addr addr);
65d4ed92	102	#endif
52eeeb84	103
f37c6059 AA	104	int ipv6_chk_rpl_srh_loop(struct net net, const struct in6_addr segs,
	105	unsigned char nsegs);
	106
7df37ff3 CB	107	bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
	108	const unsigned int prefix_len,
	109	struct net_device *dev);
	110
e8e54d3c JP	111	int ipv6_chk_prefix(const struct in6_addr addr, struct net_device dev);
e8e54d3c JP	112
4ef1a7cb XL	113	struct net_device ipv6_dev_find(struct net net, const struct in6_addr *addr,
4ef1a7cb XL	114	struct net_device *dev);
81f6cb31	115
e8e54d3c JP	116	struct inet6_ifaddr ipv6_get_ifaddr(struct net net,
	117	const struct in6_addr *addr,
	118	struct net_device *dev, int strict);
	119
	120	int ipv6_dev_get_saddr(struct net net, const struct net_device dev,
	121	const struct in6_addr *daddr, unsigned int srcprefs,
	122	struct in6_addr *saddr);
e8e54d3c	123	int ipv6_get_lladdr(struct net_device dev, struct in6_addr addr,
479840ff	124	u32 banned_flags);
7016e062 JP	125	bool inet_rcv_saddr_equal(const struct sock sk, const struct sock sk2,
7016e062 JP	126	bool match_wildcard);
2dbb9b9e	127	bool inet_rcv_saddr_any(const struct sock *sk);
e8e54d3c JP	128	void addrconf_join_solict(struct net_device dev, const struct in6_addr addr);
e8e54d3c JP	129	void addrconf_leave_solict(struct inet6_dev idev, const struct in6_addr addr);
1da177e4	130
2ad3ed59 AA	131	void addrconf_add_linklocal(struct inet6_dev *idev,
	132	const struct in6_addr *addr, u32 flags);
	133
cc84b3c6 AA	134	int addrconf_prefix_rcv_add_addr(struct net net, struct net_device dev,
	135	const struct prefix_info *pinfo,
	136	struct inet6_dev *in6_dev,
	137	const struct in6_addr *addr, int addr_type,
	138	u32 addr_flags, bool sllao, bool tokenized,
	139	__u32 valid_lft, u32 prefered_lft);
	140
4d6f2859 YS	141	static inline void addrconf_addr_eui48_base(u8 eui, const char const addr)
	142	{
	143	memcpy(eui, addr, 3);
	144	eui[3] = 0xFF;
	145	eui[4] = 0xFE;
	146	memcpy(eui + 5, addr + 3, 3);
	147	}
	148
	149	static inline void addrconf_addr_eui48(u8 eui, const char const addr)
	150	{
	151	addrconf_addr_eui48_base(eui, addr);
	152	eui[0] ^= 2;
	153	}
	154
399e6f95 MB	155	static inline int addrconf_ifid_eui48(u8 eui, struct net_device dev)
	156	{
	157	if (dev->addr_len != ETH_ALEN)
	158	return -1;
399e6f95 MB	159
	160	/*
	161	* The zSeries OSA network cards can be shared among various
	162	* OS instances, but the OSA cards have only one MAC address.
	163	* This leads to duplicate address conflicts in conjunction
	164	* with IPv6 if more than one instance uses the same card.
	165	*
	166	* The driver for these cards can deliver a unique 16-bit
	167	* identifier for each instance sharing the same card. It is
	168	* placed instead of 0xFFFE in the interface identifier. The
	169	* "u" bit of the interface identifier is not inverted in this
	170	* case. Hence the resulting interface identifier has local
	171	* scope according to RFC2373.
	172	*/
4d6f2859 YS	173
	174	addrconf_addr_eui48_base(eui, dev->dev_addr);
	175
399e6f95 MB	176	if (dev->dev_id) {
	177	eui[3] = (dev->dev_id >> 8) & 0xFF;
	178	eui[4] = dev->dev_id & 0xFF;
	179	} else {
399e6f95 MB	180	eui[0] ^= 2;
399e6f95 MB	181	}
4d6f2859	182
399e6f95 MB	183	return 0;
	184	}
	185
4bed72e4	186	static inline unsigned long addrconf_timeout_fixup(u32 timeout,
95c96174	187	unsigned int unit)
4bed72e4 YH	188	{
	189	if (timeout == 0xffffffff)
	190	return ~0UL;
	191
	192	/*
	193	* Avoid arithmetic overflow.
	194	* Assuming unit is constant and non-zero, this "if" statement
	195	* will go away on 64bit archs.
	196	*/
	197	if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
	198	return LONG_MAX / unit;
	199
	200	return timeout;
	201	}
	202
	203	static inline int addrconf_finite_timeout(unsigned long timeout)
	204	{
	205	return ~timeout;
	206	}
	207
2a8cc6c8 YH	208	/*
	209	* IPv6 Address Label subsystem (addrlabel.c)
	210	*/
e8e54d3c JP	211	int ipv6_addr_label_init(void);
e8e54d3c JP	212	void ipv6_addr_label_cleanup(void);
a3fde2ad	213	int ipv6_addr_label_rtnl_register(void);
e8e54d3c JP	214	u32 ipv6_addr_label(struct net net, const struct in6_addr addr,
e8e54d3c JP	215	int type, int ifindex);
2a8cc6c8	216
1da177e4 LT	217	/*
	218	* multicast prototypes (mcast.c)
	219	*/
32890862 DM	220	static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
32890862 DM	221	unsigned int len)
ba5ea614 LL	222	{
ba5ea614 LL	223	if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
32890862	224	return false;
ba5ea614 LL	225
	226	return pskb_may_pull(skb, len);
	227	}
	228
e8e54d3c JP	229	int ipv6_sock_mc_join(struct sock *sk, int ifindex,
	230	const struct in6_addr *addr);
	231	int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
	232	const struct in6_addr *addr);
8651be8f	233	void __ipv6_sock_mc_close(struct sock *sk);
e8e54d3c	234	void ipv6_sock_mc_close(struct sock *sk);
66eb554c	235	bool inet6_mc_check(const struct sock sk, const struct in6_addr mc_addr,
e8e54d3c JP	236	const struct in6_addr *src_addr);
	237
	238	int ipv6_dev_mc_inc(struct net_device dev, const struct in6_addr addr);
	239	int __ipv6_dev_mc_dec(struct inet6_dev idev, const struct in6_addr addr);
	240	int ipv6_dev_mc_dec(struct net_device dev, const struct in6_addr addr);
	241	void ipv6_mc_up(struct inet6_dev *idev);
	242	void ipv6_mc_down(struct inet6_dev *idev);
	243	void ipv6_mc_unmap(struct inet6_dev *idev);
	244	void ipv6_mc_remap(struct inet6_dev *idev);
	245	void ipv6_mc_init_dev(struct inet6_dev *idev);
	246	void ipv6_mc_destroy_dev(struct inet6_dev *idev);
ba5ea614	247	int ipv6_mc_check_mld(struct sk_buff *skb);
da13c59b	248	void addrconf_dad_failure(struct sk_buff skb, struct inet6_ifaddr ifp);
e8e54d3c JP	249
	250	bool ipv6_chk_mcast_addr(struct net_device dev, const struct in6_addr group,
	251	const struct in6_addr *src_addr);
	252
	253	void ipv6_mc_dad_complete(struct inet6_dev *idev);
5f81bd2e	254
daad1512 YH	255	/*
	256	* identify MLD packets for MLD filter exceptions
	257	*/
	258	static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
	259	{
	260	struct icmp6hdr *hdr;
	261
	262	if (nexthdr != IPPROTO_ICMPV6 \|\|
	263	!pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
	264	return false;
	265
	266	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
	267
	268	switch (hdr->icmp6_type) {
	269	case ICMPV6_MGM_QUERY:
	270	case ICMPV6_MGM_REPORT:
	271	case ICMPV6_MGM_REDUCTION:
	272	case ICMPV6_MLD2_REPORT:
	273	return true;
	274	default:
	275	break;
	276	}
	277	return false;
	278	}
1da177e4	279
e8e54d3c JP	280	void addrconf_prefix_rcv(struct net_device *dev,
e8e54d3c JP	281	u8 *opt, int len, bool sllao);
1da177e4	282
1da177e4 LT	283	/*
	284	* anycast prototypes (anycast.c)
	285	*/
e8e54d3c JP	286	int ipv6_sock_ac_join(struct sock *sk, int ifindex,
	287	const struct in6_addr *addr);
	288	int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
	289	const struct in6_addr *addr);
8c0de6e9	290	void __ipv6_sock_ac_close(struct sock *sk);
e8e54d3c JP	291	void ipv6_sock_ac_close(struct sock *sk);
e8e54d3c JP	292
013b4d90	293	int __ipv6_dev_ac_inc(struct inet6_dev idev, const struct in6_addr addr);
e8e54d3c	294	int __ipv6_dev_ac_dec(struct inet6_dev idev, const struct in6_addr addr);
381f4dca	295	void ipv6_ac_destroy_dev(struct inet6_dev *idev);
e8e54d3c	296	bool ipv6_chk_acast_addr(struct net net, struct net_device dev,
7c90cc2d FLB	297	const struct in6_addr *addr);
	298	bool ipv6_chk_acast_addr_src(struct net net, struct net_device dev,
	299	const struct in6_addr *addr);
2384d025 JB	300	int ipv6_anycast_init(void);
2384d025 JB	301	void ipv6_anycast_cleanup(void);
1da177e4 LT	302
1da177e4 LT	303	/* Device notifier */
e8e54d3c JP	304	int register_inet6addr_notifier(struct notifier_block *nb);
	305	int unregister_inet6addr_notifier(struct notifier_block *nb);
	306	int inet6addr_notifier_call_chain(unsigned long val, void *v);
1da177e4	307
3ad7d246 KJ	308	int register_inet6addr_validator_notifier(struct notifier_block *nb);
	309	int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
	310	int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
	311
85b3daad DA	312	void inet6_netconf_notify_devconf(struct net *net, int event, int type,
85b3daad DA	313	int ifindex, struct ipv6_devconf *devconf);
d67b8c61	314
48daa3bb ED	315	/**
	316	* __in6_dev_get - get inet6_dev pointer from netdevice
	317	* @dev: network device
	318	*
	319	* Caller must hold rcu_read_lock or RTNL, because this function
	320	* does not take a reference on the inet6_dev.
	321	*/
	322	static inline struct inet6_dev __in6_dev_get(const struct net_device dev)
1da177e4	323	{
48daa3bb	324	return rcu_dereference_rtnl(dev->ip6_ptr);
1da177e4 LT	325	}
1da177e4 LT	326
e1ae5c2e SS	327	/**
	328	* __in6_dev_stats_get - get inet6_dev pointer for stats
	329	* @dev: network device
	330	* @skb: skb for original incoming interface if neeeded
	331	*
	332	* Caller must hold rcu_read_lock or RTNL, because this function
	333	* does not take a reference on the inet6_dev.
	334	*/
	335	static inline struct inet6_dev __in6_dev_stats_get(const struct net_device dev,
	336	const struct sk_buff *skb)
	337	{
	338	if (netif_is_l3_master(dev))
	339	dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
	340	return __in6_dev_get(dev);
	341	}
	342
bdb7cc64 SS	343	/**
	344	* __in6_dev_get_safely - get inet6_dev pointer from netdevice
	345	* @dev: network device
	346	*
	347	* This is a safer version of __in6_dev_get
	348	*/
	349	static inline struct inet6_dev __in6_dev_get_safely(const struct net_device dev)
	350	{
	351	if (likely(dev))
	352	return rcu_dereference_rtnl(dev->ip6_ptr);
	353	else
	354	return NULL;
	355	}
	356
48daa3bb ED	357	/**
	358	* in6_dev_get - get inet6_dev pointer from netdevice
	359	* @dev: network device
	360	*
	361	* This version can be used in any context, and takes a reference
	362	* on the inet6_dev. Callers must use in6_dev_put() later to
	363	* release this reference.
	364	*/
	365	static inline struct inet6_dev in6_dev_get(const struct net_device dev)
1da177e4	366	{
48daa3bb ED	367	struct inet6_dev *idev;
48daa3bb ED	368
8814c4b5	369	rcu_read_lock();
48daa3bb	370	idev = rcu_dereference(dev->ip6_ptr);
1da177e4	371	if (idev)
1be92460	372	refcount_inc(&idev->refcnt);
8814c4b5	373	rcu_read_unlock();
1da177e4 LT	374	return idev;
	375	}
	376
bba24896 JP	377	static inline struct neigh_parms __in6_dev_nd_parms_get_rcu(const struct net_device dev)
	378	{
	379	struct inet6_dev *idev = __in6_dev_get(dev);
	380
	381	return idev ? idev->nd_parms : NULL;
	382	}
	383
e8e54d3c	384	void in6_dev_finish_destroy(struct inet6_dev *idev);
1da177e4	385
48daa3bb	386	static inline void in6_dev_put(struct inet6_dev *idev)
1da177e4	387	{
1be92460	388	if (refcount_dec_and_test(&idev->refcnt))
1da177e4 LT	389	in6_dev_finish_destroy(idev);
	390	}
	391
12d94a80 ED	392	static inline void in6_dev_put_clear(struct inet6_dev **pidev)
	393	{
	394	struct inet6_dev idev = pidev;
	395
	396	if (idev) {
	397	in6_dev_put(idev);
	398	*pidev = NULL;
	399	}
	400	}
	401
48daa3bb ED	402	static inline void __in6_dev_put(struct inet6_dev *idev)
48daa3bb ED	403	{
1be92460	404	refcount_dec(&idev->refcnt);
48daa3bb	405	}
1da177e4	406
48daa3bb ED	407	static inline void in6_dev_hold(struct inet6_dev *idev)
48daa3bb ED	408	{
1be92460	409	refcount_inc(&idev->refcnt);
48daa3bb	410	}
1da177e4	411
6d3d07b4 DA	412	/* called with rcu_read_lock held */
	413	static inline bool ip6_ignore_linkdown(const struct net_device *dev)
	414	{
	415	const struct inet6_dev *idev = __in6_dev_get(dev);
	416
85f0173d ZX	417	if (unlikely(!idev))
	418	return true;
	419
fca34cc0	420	return !!READ_ONCE(idev->cnf.ignore_routes_with_linkdown);
6d3d07b4 DA	421	}
6d3d07b4 DA	422
e8e54d3c	423	void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
1da177e4 LT	424
	425	static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
	426	{
271201c0	427	if (refcount_dec_and_test(&ifp->refcnt))
1da177e4 LT	428	inet6_ifa_finish_destroy(ifp);
	429	}
	430
48daa3bb ED	431	static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
48daa3bb ED	432	{
271201c0	433	refcount_dec(&ifp->refcnt);
48daa3bb	434	}
1da177e4	435
48daa3bb ED	436	static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
48daa3bb ED	437	{
271201c0	438	refcount_inc(&ifp->refcnt);
48daa3bb	439	}
1da177e4	440
7633c4da JB	441	static inline bool in6_ifa_hold_safe(struct inet6_ifaddr *ifp)
	442	{
	443	return refcount_inc_not_zero(&ifp->refcnt);
	444	}
1da177e4 LT	445
	446	/*
	447	* compute link-local solicited-node multicast address
	448	*/
	449
	450	static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
	451	struct in6_addr *solicited)
	452	{
	453	ipv6_addr_set(solicited,
0e7b8dcd YH	454	htonl(0xFF020000), 0,
	455	htonl(0x1),
	456	htonl(0xFF000000) \| addr->s6_addr32[3]);
1da177e4 LT	457	}
1da177e4 LT	458
b27b28cb	459	static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
1da177e4	460	{
d1641565	461	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	462	__be64 p = (__force __be64 )addr;
d1641565 YH	463	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(1))) == 0UL;
d1641565 YH	464	#else
48daa3bb	465	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	466	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	467	(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
d1641565	468	#endif
1da177e4 LT	469	}
1da177e4 LT	470
b27b28cb	471	static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
1da177e4	472	{
d1641565	473	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	474	__be64 p = (__force __be64 )addr;
d1641565 YH	475	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(2))) == 0UL;
d1641565 YH	476	#else
48daa3bb	477	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	478	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	479	(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
d1641565	480	#endif
1da177e4 LT	481	}
1da177e4 LT	482
b27b28cb	483	static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
c7dc89c0	484	{
48daa3bb	485	return (addr->s6_addr32[2] \| htonl(0x02000000)) == htonl(0x02005EFE);
c7dc89c0 FT	486	}
c7dc89c0 FT	487
ca97a644 YH	488	static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
ca97a644 YH	489	{
9d100774	490	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	491	__be64 p = (__force __be64 )addr;
9d100774 YH	492	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	493	((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
	494	cpu_to_be64(0xffffffffff000000UL))) == 0UL;
	495	#else
	496	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	497	addr->s6_addr32[1] \|
	498	(addr->s6_addr32[2] ^ htonl(0x00000001)) \|
	499	(addr->s6_addr[12] ^ 0xff)) == 0;
	500	#endif
ca97a644 YH	501	}
ca97a644 YH	502
4b3087c7 LL	503	static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
	504	{
	505	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	506	__be64 p = (__force __be64 )addr;
4b3087c7 LL	507
	508	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	509	(p[1] ^ cpu_to_be64(0x6a))) == 0UL;
	510	#else
	511	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	512	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
	513	(addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
	514	#endif
	515	}
	516
20380731	517	#ifdef CONFIG_PROC_FS
e8e54d3c JP	518	int if6_proc_init(void);
e8e54d3c JP	519	void if6_proc_exit(void);
20380731 ACM	520	#endif
20380731 ACM	521
1da177e4	522	#endif