[mirror_ubuntu-hirsute-kernel.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/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);

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 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
ba5ea614	52	#include <linux/ipv6.h>
1da177e4 LT	53	#include <linux/netdevice.h>
1da177e4 LT	54	#include <net/if_inet6.h>
e4553edd	55	#include <net/ipv6.h>
1da177e4	56
3ad7d246 KJ	57	struct in6_validator_info {
	58	struct in6_addr i6vi_addr;
	59	struct inet6_dev *i6vi_dev;
de95e047	60	struct netlink_ext_ack *extack;
3ad7d246 KJ	61	};
3ad7d246 KJ	62
e6464b8c DA	63	struct ifa6_config {
	64	const struct in6_addr *pfx;
	65	unsigned int plen;
	66
	67	const struct in6_addr *peer_pfx;
	68
8308f3ff	69	u32 rt_priority;
e6464b8c DA	70	u32 ifa_flags;
	71	u32 preferred_lft;
	72	u32 valid_lft;
	73	u16 scope;
	74	};
	75
e8e54d3c JP	76	int addrconf_init(void);
e8e54d3c JP	77	void addrconf_cleanup(void);
1da177e4	78
e8e54d3c JP	79	int addrconf_add_ifaddr(struct net net, void __user arg);
	80	int addrconf_del_ifaddr(struct net net, void __user arg);
	81	int addrconf_set_dstaddr(struct net net, void __user arg);
1da177e4	82
e8e54d3c JP	83	int ipv6_chk_addr(struct net net, const struct in6_addr addr,
e8e54d3c JP	84	const struct net_device *dev, int strict);
c58da4c6	85	int ipv6_chk_addr_and_flags(struct net net, const struct in6_addr addr,
232378e8 DA	86	const struct net_device *dev, bool skip_dev_check,
232378e8 DA	87	int strict, u32 banned_flags);
bfeade08	88
59fbb3a6	89	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
e8e54d3c	90	int ipv6_chk_home_addr(struct net net, const struct in6_addr addr);
65d4ed92	91	#endif
52eeeb84	92
f37c6059 AA	93	int ipv6_chk_rpl_srh_loop(struct net net, const struct in6_addr segs,
	94	unsigned char nsegs);
	95
7df37ff3 CB	96	bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
	97	const unsigned int prefix_len,
	98	struct net_device *dev);
	99
e8e54d3c JP	100	int ipv6_chk_prefix(const struct in6_addr addr, struct net_device dev);
	101
	102	struct inet6_ifaddr ipv6_get_ifaddr(struct net net,
	103	const struct in6_addr *addr,
	104	struct net_device *dev, int strict);
	105
	106	int ipv6_dev_get_saddr(struct net net, const struct net_device dev,
	107	const struct in6_addr *daddr, unsigned int srcprefs,
	108	struct in6_addr *saddr);
	109	int __ipv6_get_lladdr(struct inet6_dev idev, struct in6_addr addr,
479840ff	110	u32 banned_flags);
e8e54d3c	111	int ipv6_get_lladdr(struct net_device dev, struct in6_addr addr,
479840ff	112	u32 banned_flags);
7016e062 JP	113	bool inet_rcv_saddr_equal(const struct sock sk, const struct sock sk2,
7016e062 JP	114	bool match_wildcard);
2dbb9b9e	115	bool inet_rcv_saddr_any(const struct sock *sk);
e8e54d3c JP	116	void addrconf_join_solict(struct net_device dev, const struct in6_addr addr);
e8e54d3c JP	117	void addrconf_leave_solict(struct inet6_dev idev, const struct in6_addr addr);
1da177e4	118
2ad3ed59 AA	119	void addrconf_add_linklocal(struct inet6_dev *idev,
	120	const struct in6_addr *addr, u32 flags);
	121
cc84b3c6 AA	122	int addrconf_prefix_rcv_add_addr(struct net net, struct net_device dev,
	123	const struct prefix_info *pinfo,
	124	struct inet6_dev *in6_dev,
	125	const struct in6_addr *addr, int addr_type,
	126	u32 addr_flags, bool sllao, bool tokenized,
	127	__u32 valid_lft, u32 prefered_lft);
	128
4d6f2859 YS	129	static inline void addrconf_addr_eui48_base(u8 eui, const char const addr)
	130	{
	131	memcpy(eui, addr, 3);
	132	eui[3] = 0xFF;
	133	eui[4] = 0xFE;
	134	memcpy(eui + 5, addr + 3, 3);
	135	}
	136
	137	static inline void addrconf_addr_eui48(u8 eui, const char const addr)
	138	{
	139	addrconf_addr_eui48_base(eui, addr);
	140	eui[0] ^= 2;
	141	}
	142
399e6f95 MB	143	static inline int addrconf_ifid_eui48(u8 eui, struct net_device dev)
	144	{
	145	if (dev->addr_len != ETH_ALEN)
	146	return -1;
399e6f95 MB	147
	148	/*
	149	* The zSeries OSA network cards can be shared among various
	150	* OS instances, but the OSA cards have only one MAC address.
	151	* This leads to duplicate address conflicts in conjunction
	152	* with IPv6 if more than one instance uses the same card.
	153	*
	154	* The driver for these cards can deliver a unique 16-bit
	155	* identifier for each instance sharing the same card. It is
	156	* placed instead of 0xFFFE in the interface identifier. The
	157	* "u" bit of the interface identifier is not inverted in this
	158	* case. Hence the resulting interface identifier has local
	159	* scope according to RFC2373.
	160	*/
4d6f2859 YS	161
	162	addrconf_addr_eui48_base(eui, dev->dev_addr);
	163
399e6f95 MB	164	if (dev->dev_id) {
	165	eui[3] = (dev->dev_id >> 8) & 0xFF;
	166	eui[4] = dev->dev_id & 0xFF;
	167	} else {
399e6f95 MB	168	eui[0] ^= 2;
399e6f95 MB	169	}
4d6f2859	170
399e6f95 MB	171	return 0;
	172	}
	173
4bed72e4	174	static inline unsigned long addrconf_timeout_fixup(u32 timeout,
95c96174	175	unsigned int unit)
4bed72e4 YH	176	{
	177	if (timeout == 0xffffffff)
	178	return ~0UL;
	179
	180	/*
	181	* Avoid arithmetic overflow.
	182	* Assuming unit is constant and non-zero, this "if" statement
	183	* will go away on 64bit archs.
	184	*/
	185	if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
	186	return LONG_MAX / unit;
	187
	188	return timeout;
	189	}
	190
	191	static inline int addrconf_finite_timeout(unsigned long timeout)
	192	{
	193	return ~timeout;
	194	}
	195
2a8cc6c8 YH	196	/*
	197	* IPv6 Address Label subsystem (addrlabel.c)
	198	*/
e8e54d3c JP	199	int ipv6_addr_label_init(void);
e8e54d3c JP	200	void ipv6_addr_label_cleanup(void);
a3fde2ad	201	int ipv6_addr_label_rtnl_register(void);
e8e54d3c JP	202	u32 ipv6_addr_label(struct net net, const struct in6_addr addr,
e8e54d3c JP	203	int type, int ifindex);
2a8cc6c8	204
1da177e4 LT	205	/*
	206	* multicast prototypes (mcast.c)
	207	*/
32890862 DM	208	static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
32890862 DM	209	unsigned int len)
ba5ea614 LL	210	{
ba5ea614 LL	211	if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
32890862	212	return false;
ba5ea614 LL	213
	214	return pskb_may_pull(skb, len);
	215	}
	216
e8e54d3c JP	217	int ipv6_sock_mc_join(struct sock *sk, int ifindex,
	218	const struct in6_addr *addr);
	219	int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
	220	const struct in6_addr *addr);
8651be8f	221	void __ipv6_sock_mc_close(struct sock *sk);
e8e54d3c JP	222	void ipv6_sock_mc_close(struct sock *sk);
	223	bool inet6_mc_check(struct sock sk, const struct in6_addr mc_addr,
	224	const struct in6_addr *src_addr);
	225
	226	int ipv6_dev_mc_inc(struct net_device dev, const struct in6_addr addr);
	227	int __ipv6_dev_mc_dec(struct inet6_dev idev, const struct in6_addr addr);
	228	int ipv6_dev_mc_dec(struct net_device dev, const struct in6_addr addr);
	229	void ipv6_mc_up(struct inet6_dev *idev);
	230	void ipv6_mc_down(struct inet6_dev *idev);
	231	void ipv6_mc_unmap(struct inet6_dev *idev);
	232	void ipv6_mc_remap(struct inet6_dev *idev);
	233	void ipv6_mc_init_dev(struct inet6_dev *idev);
	234	void ipv6_mc_destroy_dev(struct inet6_dev *idev);
4b3087c7	235	int ipv6_mc_check_icmpv6(struct sk_buff *skb);
ba5ea614	236	int ipv6_mc_check_mld(struct sk_buff *skb);
da13c59b	237	void addrconf_dad_failure(struct sk_buff skb, struct inet6_ifaddr ifp);
e8e54d3c JP	238
	239	bool ipv6_chk_mcast_addr(struct net_device dev, const struct in6_addr group,
	240	const struct in6_addr *src_addr);
	241
	242	void ipv6_mc_dad_complete(struct inet6_dev *idev);
5f81bd2e	243
daad1512 YH	244	/*
	245	* identify MLD packets for MLD filter exceptions
	246	*/
	247	static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
	248	{
	249	struct icmp6hdr *hdr;
	250
	251	if (nexthdr != IPPROTO_ICMPV6 \|\|
	252	!pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
	253	return false;
	254
	255	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
	256
	257	switch (hdr->icmp6_type) {
	258	case ICMPV6_MGM_QUERY:
	259	case ICMPV6_MGM_REPORT:
	260	case ICMPV6_MGM_REDUCTION:
	261	case ICMPV6_MLD2_REPORT:
	262	return true;
	263	default:
	264	break;
	265	}
	266	return false;
	267	}
1da177e4	268
e8e54d3c JP	269	void addrconf_prefix_rcv(struct net_device *dev,
e8e54d3c JP	270	u8 *opt, int len, bool sllao);
1da177e4	271
1da177e4 LT	272	/*
	273	* anycast prototypes (anycast.c)
	274	*/
e8e54d3c JP	275	int ipv6_sock_ac_join(struct sock *sk, int ifindex,
	276	const struct in6_addr *addr);
	277	int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
	278	const struct in6_addr *addr);
	279	void ipv6_sock_ac_close(struct sock *sk);
	280
013b4d90	281	int __ipv6_dev_ac_inc(struct inet6_dev idev, const struct in6_addr addr);
e8e54d3c	282	int __ipv6_dev_ac_dec(struct inet6_dev idev, const struct in6_addr addr);
381f4dca	283	void ipv6_ac_destroy_dev(struct inet6_dev *idev);
e8e54d3c	284	bool ipv6_chk_acast_addr(struct net net, struct net_device dev,
7c90cc2d FLB	285	const struct in6_addr *addr);
	286	bool ipv6_chk_acast_addr_src(struct net net, struct net_device dev,
	287	const struct in6_addr *addr);
2384d025 JB	288	int ipv6_anycast_init(void);
2384d025 JB	289	void ipv6_anycast_cleanup(void);
1da177e4 LT	290
1da177e4 LT	291	/* Device notifier */
e8e54d3c JP	292	int register_inet6addr_notifier(struct notifier_block *nb);
	293	int unregister_inet6addr_notifier(struct notifier_block *nb);
	294	int inet6addr_notifier_call_chain(unsigned long val, void *v);
1da177e4	295
3ad7d246 KJ	296	int register_inet6addr_validator_notifier(struct notifier_block *nb);
	297	int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
	298	int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
	299
85b3daad DA	300	void inet6_netconf_notify_devconf(struct net *net, int event, int type,
85b3daad DA	301	int ifindex, struct ipv6_devconf *devconf);
d67b8c61	302
48daa3bb ED	303	/**
	304	* __in6_dev_get - get inet6_dev pointer from netdevice
	305	* @dev: network device
	306	*
	307	* Caller must hold rcu_read_lock or RTNL, because this function
	308	* does not take a reference on the inet6_dev.
	309	*/
	310	static inline struct inet6_dev __in6_dev_get(const struct net_device dev)
1da177e4	311	{
48daa3bb	312	return rcu_dereference_rtnl(dev->ip6_ptr);
1da177e4 LT	313	}
1da177e4 LT	314
e1ae5c2e SS	315	/**
	316	* __in6_dev_stats_get - get inet6_dev pointer for stats
	317	* @dev: network device
	318	* @skb: skb for original incoming interface if neeeded
	319	*
	320	* Caller must hold rcu_read_lock or RTNL, because this function
	321	* does not take a reference on the inet6_dev.
	322	*/
	323	static inline struct inet6_dev __in6_dev_stats_get(const struct net_device dev,
	324	const struct sk_buff *skb)
	325	{
	326	if (netif_is_l3_master(dev))
	327	dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
	328	return __in6_dev_get(dev);
	329	}
	330
bdb7cc64 SS	331	/**
	332	* __in6_dev_get_safely - get inet6_dev pointer from netdevice
	333	* @dev: network device
	334	*
	335	* This is a safer version of __in6_dev_get
	336	*/
	337	static inline struct inet6_dev __in6_dev_get_safely(const struct net_device dev)
	338	{
	339	if (likely(dev))
	340	return rcu_dereference_rtnl(dev->ip6_ptr);
	341	else
	342	return NULL;
	343	}
	344
48daa3bb ED	345	/**
	346	* in6_dev_get - get inet6_dev pointer from netdevice
	347	* @dev: network device
	348	*
	349	* This version can be used in any context, and takes a reference
	350	* on the inet6_dev. Callers must use in6_dev_put() later to
	351	* release this reference.
	352	*/
	353	static inline struct inet6_dev in6_dev_get(const struct net_device dev)
1da177e4	354	{
48daa3bb ED	355	struct inet6_dev *idev;
48daa3bb ED	356
8814c4b5	357	rcu_read_lock();
48daa3bb	358	idev = rcu_dereference(dev->ip6_ptr);
1da177e4	359	if (idev)
1be92460	360	refcount_inc(&idev->refcnt);
8814c4b5	361	rcu_read_unlock();
1da177e4 LT	362	return idev;
	363	}
	364
bba24896 JP	365	static inline struct neigh_parms __in6_dev_nd_parms_get_rcu(const struct net_device dev)
	366	{
	367	struct inet6_dev *idev = __in6_dev_get(dev);
	368
	369	return idev ? idev->nd_parms : NULL;
	370	}
	371
e8e54d3c	372	void in6_dev_finish_destroy(struct inet6_dev *idev);
1da177e4	373
48daa3bb	374	static inline void in6_dev_put(struct inet6_dev *idev)
1da177e4	375	{
1be92460	376	if (refcount_dec_and_test(&idev->refcnt))
1da177e4 LT	377	in6_dev_finish_destroy(idev);
	378	}
	379
12d94a80 ED	380	static inline void in6_dev_put_clear(struct inet6_dev **pidev)
	381	{
	382	struct inet6_dev idev = pidev;
	383
	384	if (idev) {
	385	in6_dev_put(idev);
	386	*pidev = NULL;
	387	}
	388	}
	389
48daa3bb ED	390	static inline void __in6_dev_put(struct inet6_dev *idev)
48daa3bb ED	391	{
1be92460	392	refcount_dec(&idev->refcnt);
48daa3bb	393	}
1da177e4	394
48daa3bb ED	395	static inline void in6_dev_hold(struct inet6_dev *idev)
48daa3bb ED	396	{
1be92460	397	refcount_inc(&idev->refcnt);
48daa3bb	398	}
1da177e4	399
6d3d07b4 DA	400	/* called with rcu_read_lock held */
	401	static inline bool ip6_ignore_linkdown(const struct net_device *dev)
	402	{
	403	const struct inet6_dev *idev = __in6_dev_get(dev);
	404
	405	return !!idev->cnf.ignore_routes_with_linkdown;
	406	}
	407
e8e54d3c	408	void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
1da177e4 LT	409
	410	static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
	411	{
271201c0	412	if (refcount_dec_and_test(&ifp->refcnt))
1da177e4 LT	413	inet6_ifa_finish_destroy(ifp);
	414	}
	415
48daa3bb ED	416	static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
48daa3bb ED	417	{
271201c0	418	refcount_dec(&ifp->refcnt);
48daa3bb	419	}
1da177e4	420
48daa3bb ED	421	static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
48daa3bb ED	422	{
271201c0	423	refcount_inc(&ifp->refcnt);
48daa3bb	424	}
1da177e4	425
1da177e4 LT	426
	427	/*
	428	* compute link-local solicited-node multicast address
	429	*/
	430
	431	static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
	432	struct in6_addr *solicited)
	433	{
	434	ipv6_addr_set(solicited,
0e7b8dcd YH	435	htonl(0xFF020000), 0,
	436	htonl(0x1),
	437	htonl(0xFF000000) \| addr->s6_addr32[3]);
1da177e4 LT	438	}
1da177e4 LT	439
b27b28cb	440	static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
1da177e4	441	{
d1641565	442	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	443	__be64 p = (__force __be64 )addr;
d1641565 YH	444	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(1))) == 0UL;
d1641565 YH	445	#else
48daa3bb	446	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	447	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	448	(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
d1641565	449	#endif
1da177e4 LT	450	}
1da177e4 LT	451
b27b28cb	452	static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
1da177e4	453	{
d1641565	454	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	455	__be64 p = (__force __be64 )addr;
d1641565 YH	456	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(2))) == 0UL;
d1641565 YH	457	#else
48daa3bb	458	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	459	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	460	(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
d1641565	461	#endif
1da177e4 LT	462	}
1da177e4 LT	463
b27b28cb	464	static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
c7dc89c0	465	{
48daa3bb	466	return (addr->s6_addr32[2] \| htonl(0x02000000)) == htonl(0x02005EFE);
c7dc89c0 FT	467	}
c7dc89c0 FT	468
ca97a644 YH	469	static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
ca97a644 YH	470	{
9d100774	471	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	472	__be64 p = (__force __be64 )addr;
9d100774 YH	473	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	474	((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
	475	cpu_to_be64(0xffffffffff000000UL))) == 0UL;
	476	#else
	477	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	478	addr->s6_addr32[1] \|
	479	(addr->s6_addr32[2] ^ htonl(0x00000001)) \|
	480	(addr->s6_addr[12] ^ 0xff)) == 0;
	481	#endif
ca97a644 YH	482	}
ca97a644 YH	483
4b3087c7 LL	484	static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
	485	{
	486	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
54e1f08b	487	__be64 p = (__force __be64 )addr;
4b3087c7 LL	488
	489	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	490	(p[1] ^ cpu_to_be64(0x6a))) == 0UL;
	491	#else
	492	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	493	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
	494	(addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
	495	#endif
	496	}
	497
20380731	498	#ifdef CONFIG_PROC_FS
e8e54d3c JP	499	int if6_proc_init(void);
e8e54d3c JP	500	void if6_proc_exit(void);
20380731 ACM	501	#endif
20380731 ACM	502
1da177e4	503	#endif