[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 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/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;

	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 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);
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(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_icmpv6(struct sk_buff *skb);
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);

	return !!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);
}


/*
 *	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
1da177e4 LT	9	#define TEMP_VALID_LIFETIME (7*86400)
1da177e4 LT	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
242d3a49 WC	22	#define ADDRCONF_NOTIFY_PRIORITY 0
242d3a49 WC	23
c7dc89c0	24	#include <linux/in.h>
6a800d45 PM	25	#include <linux/in6.h>
6a800d45 PM	26
1da177e4 LT	27	struct prefix_info {
	28	__u8 type;
	29	__u8 length;
	30	__u8 prefix_len;
	31
	32	#if defined(__BIG_ENDIAN_BITFIELD)
	33	__u8 onlink : 1,
	34	autoconf : 1,
	35	reserved : 6;
	36	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	37	__u8 reserved : 6,
	38	autoconf : 1,
	39	onlink : 1;
	40	#else
	41	#error "Please fix <asm/byteorder.h>"
	42	#endif
e69a4adc AV	43	__be32 valid;
	44	__be32 prefered;
	45	__be32 reserved2;
1da177e4 LT	46
	47	struct in6_addr prefix;
	48	};
	49
ba5ea614	50	#include <linux/ipv6.h>
1da177e4 LT	51	#include <linux/netdevice.h>
1da177e4 LT	52	#include <net/if_inet6.h>
e4553edd	53	#include <net/ipv6.h>
1da177e4	54
3ad7d246 KJ	55	struct in6_validator_info {
	56	struct in6_addr i6vi_addr;
	57	struct inet6_dev *i6vi_dev;
de95e047	58	struct netlink_ext_ack *extack;
3ad7d246 KJ	59	};
3ad7d246 KJ	60
e6464b8c DA	61	struct ifa6_config {
	62	const struct in6_addr *pfx;
	63	unsigned int plen;
	64
	65	const struct in6_addr *peer_pfx;
	66
8308f3ff	67	u32 rt_priority;
e6464b8c DA	68	u32 ifa_flags;
	69	u32 preferred_lft;
	70	u32 valid_lft;
	71	u16 scope;
	72	};
	73
e8e54d3c JP	74	int addrconf_init(void);
e8e54d3c JP	75	void addrconf_cleanup(void);
1da177e4	76
e8e54d3c JP	77	int addrconf_add_ifaddr(struct net net, void __user arg);
	78	int addrconf_del_ifaddr(struct net net, void __user arg);
	79	int addrconf_set_dstaddr(struct net net, void __user arg);
1da177e4	80
e8e54d3c JP	81	int ipv6_chk_addr(struct net net, const struct in6_addr addr,
e8e54d3c JP	82	const struct net_device *dev, int strict);
c58da4c6	83	int ipv6_chk_addr_and_flags(struct net net, const struct in6_addr addr,
232378e8 DA	84	const struct net_device *dev, bool skip_dev_check,
232378e8 DA	85	int strict, u32 banned_flags);
bfeade08	86
59fbb3a6	87	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
e8e54d3c	88	int ipv6_chk_home_addr(struct net net, const struct in6_addr addr);
65d4ed92	89	#endif
52eeeb84	90
f37c6059 AA	91	int ipv6_chk_rpl_srh_loop(struct net net, const struct in6_addr segs,
	92	unsigned char nsegs);
	93
7df37ff3 CB	94	bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
	95	const unsigned int prefix_len,
	96	struct net_device *dev);
	97
e8e54d3c JP	98	int ipv6_chk_prefix(const struct in6_addr addr, struct net_device dev);
	99
	100	struct inet6_ifaddr ipv6_get_ifaddr(struct net net,
	101	const struct in6_addr *addr,
	102	struct net_device *dev, int strict);
	103
	104	int ipv6_dev_get_saddr(struct net net, const struct net_device dev,
	105	const struct in6_addr *daddr, unsigned int srcprefs,
	106	struct in6_addr *saddr);
	107	int __ipv6_get_lladdr(struct inet6_dev idev, struct in6_addr addr,
479840ff	108	u32 banned_flags);
e8e54d3c	109	int ipv6_get_lladdr(struct net_device dev, struct in6_addr addr,
479840ff	110	u32 banned_flags);
7016e062 JP	111	bool inet_rcv_saddr_equal(const struct sock sk, const struct sock sk2,
7016e062 JP	112	bool match_wildcard);
2dbb9b9e	113	bool inet_rcv_saddr_any(const struct sock *sk);
e8e54d3c JP	114	void addrconf_join_solict(struct net_device dev, const struct in6_addr addr);
e8e54d3c JP	115	void addrconf_leave_solict(struct inet6_dev idev, const struct in6_addr addr);
1da177e4	116
2ad3ed59 AA	117	void addrconf_add_linklocal(struct inet6_dev *idev,
	118	const struct in6_addr *addr, u32 flags);
	119
cc84b3c6 AA	120	int addrconf_prefix_rcv_add_addr(struct net net, struct net_device dev,
	121	const struct prefix_info *pinfo,
	122	struct inet6_dev *in6_dev,
	123	const struct in6_addr *addr, int addr_type,
	124	u32 addr_flags, bool sllao, bool tokenized,
	125	__u32 valid_lft, u32 prefered_lft);
	126
4d6f2859 YS	127	static inline void addrconf_addr_eui48_base(u8 eui, const char const addr)
	128	{
	129	memcpy(eui, addr, 3);
	130	eui[3] = 0xFF;
	131	eui[4] = 0xFE;
	132	memcpy(eui + 5, addr + 3, 3);
	133	}
	134
	135	static inline void addrconf_addr_eui48(u8 eui, const char const addr)
	136	{
	137	addrconf_addr_eui48_base(eui, addr);
	138	eui[0] ^= 2;
	139	}
	140
399e6f95 MB	141	static inline int addrconf_ifid_eui48(u8 eui, struct net_device dev)
	142	{
	143	if (dev->addr_len != ETH_ALEN)
	144	return -1;
399e6f95 MB	145
	146	/*
	147	* The zSeries OSA network cards can be shared among various
	148	* OS instances, but the OSA cards have only one MAC address.
	149	* This leads to duplicate address conflicts in conjunction
	150	* with IPv6 if more than one instance uses the same card.
	151	*
	152	* The driver for these cards can deliver a unique 16-bit
	153	* identifier for each instance sharing the same card. It is
	154	* placed instead of 0xFFFE in the interface identifier. The
	155	* "u" bit of the interface identifier is not inverted in this
	156	* case. Hence the resulting interface identifier has local
	157	* scope according to RFC2373.
	158	*/
4d6f2859 YS	159
	160	addrconf_addr_eui48_base(eui, dev->dev_addr);
	161
399e6f95 MB	162	if (dev->dev_id) {
	163	eui[3] = (dev->dev_id >> 8) & 0xFF;
	164	eui[4] = dev->dev_id & 0xFF;
	165	} else {
399e6f95 MB	166	eui[0] ^= 2;
399e6f95 MB	167	}
4d6f2859	168
399e6f95 MB	169	return 0;
	170	}
	171
4bed72e4	172	static inline unsigned long addrconf_timeout_fixup(u32 timeout,
95c96174	173	unsigned int unit)
4bed72e4 YH	174	{
	175	if (timeout == 0xffffffff)
	176	return ~0UL;
	177
	178	/*
	179	* Avoid arithmetic overflow.
	180	* Assuming unit is constant and non-zero, this "if" statement
	181	* will go away on 64bit archs.
	182	*/
	183	if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
	184	return LONG_MAX / unit;
	185
	186	return timeout;
	187	}
	188
	189	static inline int addrconf_finite_timeout(unsigned long timeout)
	190	{
	191	return ~timeout;
	192	}
	193
2a8cc6c8 YH	194	/*
	195	* IPv6 Address Label subsystem (addrlabel.c)
	196	*/
e8e54d3c JP	197	int ipv6_addr_label_init(void);
e8e54d3c JP	198	void ipv6_addr_label_cleanup(void);
a3fde2ad	199	int ipv6_addr_label_rtnl_register(void);
e8e54d3c JP	200	u32 ipv6_addr_label(struct net net, const struct in6_addr addr,
e8e54d3c JP	201	int type, int ifindex);
2a8cc6c8	202
1da177e4 LT	203	/*
	204	* multicast prototypes (mcast.c)
	205	*/
32890862 DM	206	static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
32890862 DM	207	unsigned int len)
ba5ea614 LL	208	{
ba5ea614 LL	209	if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
32890862	210	return false;
ba5ea614 LL	211
	212	return pskb_may_pull(skb, len);
	213	}
	214
e8e54d3c JP	215	int ipv6_sock_mc_join(struct sock *sk, int ifindex,
	216	const struct in6_addr *addr);
	217	int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
	218	const struct in6_addr *addr);
8651be8f	219	void __ipv6_sock_mc_close(struct sock *sk);
e8e54d3c JP	220	void ipv6_sock_mc_close(struct sock *sk);
	221	bool inet6_mc_check(struct sock sk, const struct in6_addr mc_addr,
	222	const struct in6_addr *src_addr);
	223
	224	int ipv6_dev_mc_inc(struct net_device dev, const struct in6_addr addr);
	225	int __ipv6_dev_mc_dec(struct inet6_dev idev, const struct in6_addr addr);
	226	int ipv6_dev_mc_dec(struct net_device dev, const struct in6_addr addr);
	227	void ipv6_mc_up(struct inet6_dev *idev);
	228	void ipv6_mc_down(struct inet6_dev *idev);
	229	void ipv6_mc_unmap(struct inet6_dev *idev);
	230	void ipv6_mc_remap(struct inet6_dev *idev);
	231	void ipv6_mc_init_dev(struct inet6_dev *idev);
	232	void ipv6_mc_destroy_dev(struct inet6_dev *idev);
4b3087c7	233	int ipv6_mc_check_icmpv6(struct sk_buff *skb);
ba5ea614	234	int ipv6_mc_check_mld(struct sk_buff *skb);
da13c59b	235	void addrconf_dad_failure(struct sk_buff skb, struct inet6_ifaddr ifp);
e8e54d3c JP	236
	237	bool ipv6_chk_mcast_addr(struct net_device dev, const struct in6_addr group,
	238	const struct in6_addr *src_addr);
	239
	240	void ipv6_mc_dad_complete(struct inet6_dev *idev);
5f81bd2e	241
daad1512 YH	242	/*
	243	* identify MLD packets for MLD filter exceptions
	244	*/
	245	static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
	246	{
	247	struct icmp6hdr *hdr;
	248
	249	if (nexthdr != IPPROTO_ICMPV6 \|\|
	250	!pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
	251	return false;
	252
	253	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
	254
	255	switch (hdr->icmp6_type) {
	256	case ICMPV6_MGM_QUERY:
	257	case ICMPV6_MGM_REPORT:
	258	case ICMPV6_MGM_REDUCTION:
	259	case ICMPV6_MLD2_REPORT:
	260	return true;
	261	default:
	262	break;
	263	}
	264	return false;
	265	}
1da177e4	266
e8e54d3c JP	267	void addrconf_prefix_rcv(struct net_device *dev,
e8e54d3c JP	268	u8 *opt, int len, bool sllao);
1da177e4	269
1da177e4 LT	270	/*
	271	* anycast prototypes (anycast.c)
	272	*/
e8e54d3c JP	273	int ipv6_sock_ac_join(struct sock *sk, int ifindex,
	274	const struct in6_addr *addr);
	275	int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
	276	const struct in6_addr *addr);
8c0de6e9	277	void __ipv6_sock_ac_close(struct sock *sk);
e8e54d3c JP	278	void ipv6_sock_ac_close(struct sock *sk);
e8e54d3c JP	279
013b4d90	280	int __ipv6_dev_ac_inc(struct inet6_dev idev, const struct in6_addr addr);
e8e54d3c	281	int __ipv6_dev_ac_dec(struct inet6_dev idev, const struct in6_addr addr);
381f4dca	282	void ipv6_ac_destroy_dev(struct inet6_dev *idev);
e8e54d3c	283	bool ipv6_chk_acast_addr(struct net net, struct net_device dev,
7c90cc2d FLB	284	const struct in6_addr *addr);
	285	bool ipv6_chk_acast_addr_src(struct net net, struct net_device dev,
	286	const struct in6_addr *addr);
2384d025 JB	287	int ipv6_anycast_init(void);
2384d025 JB	288	void ipv6_anycast_cleanup(void);
1da177e4 LT	289
1da177e4 LT	290	/* Device notifier */
e8e54d3c JP	291	int register_inet6addr_notifier(struct notifier_block *nb);
	292	int unregister_inet6addr_notifier(struct notifier_block *nb);
	293	int inet6addr_notifier_call_chain(unsigned long val, void *v);
1da177e4	294
3ad7d246 KJ	295	int register_inet6addr_validator_notifier(struct notifier_block *nb);
	296	int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
	297	int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
	298
85b3daad DA	299	void inet6_netconf_notify_devconf(struct net *net, int event, int type,
85b3daad DA	300	int ifindex, struct ipv6_devconf *devconf);
d67b8c61	301
48daa3bb ED	302	/**
	303	* __in6_dev_get - get inet6_dev pointer from netdevice
	304	* @dev: network device
	305	*
	306	* Caller must hold rcu_read_lock or RTNL, because this function
	307	* does not take a reference on the inet6_dev.
	308	*/
	309	static inline struct inet6_dev __in6_dev_get(const struct net_device dev)
1da177e4	310	{
48daa3bb	311	return rcu_dereference_rtnl(dev->ip6_ptr);
1da177e4 LT	312	}
1da177e4 LT	313
e1ae5c2e SS	314	/**
	315	* __in6_dev_stats_get - get inet6_dev pointer for stats
	316	* @dev: network device
	317	* @skb: skb for original incoming interface if neeeded
	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_stats_get(const struct net_device dev,
	323	const struct sk_buff *skb)
	324	{
	325	if (netif_is_l3_master(dev))
	326	dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
	327	return __in6_dev_get(dev);
	328	}
	329
bdb7cc64 SS	330	/**
	331	* __in6_dev_get_safely - get inet6_dev pointer from netdevice
	332	* @dev: network device
	333	*
	334	* This is a safer version of __in6_dev_get
	335	*/
	336	static inline struct inet6_dev __in6_dev_get_safely(const struct net_device dev)
	337	{
	338	if (likely(dev))
	339	return rcu_dereference_rtnl(dev->ip6_ptr);
	340	else
	341	return NULL;
	342	}
	343
48daa3bb ED	344	/**
	345	* in6_dev_get - get inet6_dev pointer from netdevice
	346	* @dev: network device
	347	*
	348	* This version can be used in any context, and takes a reference
	349	* on the inet6_dev. Callers must use in6_dev_put() later to
	350	* release this reference.
	351	*/
	352	static inline struct inet6_dev in6_dev_get(const struct net_device dev)
1da177e4	353	{
48daa3bb ED	354	struct inet6_dev *idev;
48daa3bb ED	355
8814c4b5	356	rcu_read_lock();
48daa3bb	357	idev = rcu_dereference(dev->ip6_ptr);
1da177e4	358	if (idev)
1be92460	359	refcount_inc(&idev->refcnt);
8814c4b5	360	rcu_read_unlock();
1da177e4 LT	361	return idev;
	362	}
	363
bba24896 JP	364	static inline struct neigh_parms __in6_dev_nd_parms_get_rcu(const struct net_device dev)
	365	{
	366	struct inet6_dev *idev = __in6_dev_get(dev);
	367
	368	return idev ? idev->nd_parms : NULL;
	369	}
	370
e8e54d3c	371	void in6_dev_finish_destroy(struct inet6_dev *idev);
1da177e4	372
48daa3bb	373	static inline void in6_dev_put(struct inet6_dev *idev)
1da177e4	374	{
1be92460	375	if (refcount_dec_and_test(&idev->refcnt))
1da177e4 LT	376	in6_dev_finish_destroy(idev);
	377	}
	378
12d94a80 ED	379	static inline void in6_dev_put_clear(struct inet6_dev **pidev)
	380	{
	381	struct inet6_dev idev = pidev;
	382
	383	if (idev) {
	384	in6_dev_put(idev);
	385	*pidev = NULL;
	386	}
	387	}
	388
48daa3bb ED	389	static inline void __in6_dev_put(struct inet6_dev *idev)
48daa3bb ED	390	{
1be92460	391	refcount_dec(&idev->refcnt);
48daa3bb	392	}
1da177e4	393
48daa3bb ED	394	static inline void in6_dev_hold(struct inet6_dev *idev)
48daa3bb ED	395	{
1be92460	396	refcount_inc(&idev->refcnt);
48daa3bb	397	}
1da177e4	398
6d3d07b4 DA	399	/* called with rcu_read_lock held */
	400	static inline bool ip6_ignore_linkdown(const struct net_device *dev)
	401	{
	402	const struct inet6_dev *idev = __in6_dev_get(dev);
	403
	404	return !!idev->cnf.ignore_routes_with_linkdown;
	405	}
	406
e8e54d3c	407	void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
1da177e4 LT	408
	409	static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
	410	{
271201c0	411	if (refcount_dec_and_test(&ifp->refcnt))
1da177e4 LT	412	inet6_ifa_finish_destroy(ifp);
	413	}
	414
48daa3bb ED	415	static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
48daa3bb ED	416	{
271201c0	417	refcount_dec(&ifp->refcnt);
48daa3bb	418	}
1da177e4	419
48daa3bb ED	420	static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
48daa3bb ED	421	{
271201c0	422	refcount_inc(&ifp->refcnt);
48daa3bb	423	}
1da177e4	424
1da177e4 LT	425
	426	/*
	427	* compute link-local solicited-node multicast address
	428	*/
	429
	430	static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
	431	struct in6_addr *solicited)
	432	{
	433	ipv6_addr_set(solicited,
0e7b8dcd YH	434	htonl(0xFF020000), 0,
	435	htonl(0x1),
	436	htonl(0xFF000000) \| addr->s6_addr32[3]);
1da177e4 LT	437	}
1da177e4 LT	438
b27b28cb	439	static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
1da177e4	440	{
d1641565	441	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	442	__be64 p = (__force __be64 )addr;
d1641565 YH	443	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(1))) == 0UL;
d1641565 YH	444	#else
48daa3bb	445	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	446	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	447	(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
d1641565	448	#endif
1da177e4 LT	449	}
1da177e4 LT	450
b27b28cb	451	static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
1da177e4	452	{
d1641565	453	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	454	__be64 p = (__force __be64 )addr;
d1641565 YH	455	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(2))) == 0UL;
d1641565 YH	456	#else
48daa3bb	457	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	458	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	459	(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
d1641565	460	#endif
1da177e4 LT	461	}
1da177e4 LT	462
b27b28cb	463	static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
c7dc89c0	464	{
48daa3bb	465	return (addr->s6_addr32[2] \| htonl(0x02000000)) == htonl(0x02005EFE);
c7dc89c0 FT	466	}
c7dc89c0 FT	467
ca97a644 YH	468	static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
ca97a644 YH	469	{
9d100774	470	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	471	__be64 p = (__force __be64 )addr;
9d100774 YH	472	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	473	((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
	474	cpu_to_be64(0xffffffffff000000UL))) == 0UL;
	475	#else
	476	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	477	addr->s6_addr32[1] \|
	478	(addr->s6_addr32[2] ^ htonl(0x00000001)) \|
	479	(addr->s6_addr[12] ^ 0xff)) == 0;
	480	#endif
ca97a644 YH	481	}
ca97a644 YH	482
4b3087c7 LL	483	static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
	484	{
	485	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	486	__be64 p = (__force __be64 )addr;
4b3087c7 LL	487
	488	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	489	(p[1] ^ cpu_to_be64(0x6a))) == 0UL;
	490	#else
	491	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	492	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
	493	(addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
	494	#endif
	495	}
	496
20380731	497	#ifdef CONFIG_PROC_FS
e8e54d3c JP	498	int if6_proc_init(void);
e8e54d3c JP	499	void if6_proc_exit(void);
20380731 ACM	500	#endif
20380731 ACM	501
1da177e4	502	#endif