[mirror_ubuntu-eoan-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/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

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)
 */
int ipv6_sock_mc_join(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
void __ipv6_sock_mc_close(struct sock *sk);
void ipv6_sock_mc_close(struct sock *sk);
bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
		    const struct in6_addr *src_addr);

int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
void ipv6_mc_up(struct inet6_dev *idev);
void ipv6_mc_down(struct inet6_dev *idev);
void ipv6_mc_unmap(struct inet6_dev *idev);
void ipv6_mc_remap(struct inet6_dev *idev);
void ipv6_mc_init_dev(struct inet6_dev *idev);
void ipv6_mc_destroy_dev(struct inet6_dev *idev);
int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);

bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
			 const struct in6_addr *src_addr);

void ipv6_mc_dad_complete(struct inet6_dev *idev);

/* A stub used by vxlan module. This is ugly, ideally these
 * symbols should be built into the core kernel.
 */
struct ipv6_stub {
	int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
				 const struct in6_addr *addr);
	int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
				 const struct in6_addr *addr);
	int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
			       struct dst_entry **dst, struct flowi6 *fl6);

	struct fib6_table *(*fib6_get_table)(struct net *net, u32 id);
	struct fib6_info *(*fib6_lookup)(struct net *net, int oif,
					 struct flowi6 *fl6, int flags);
	struct fib6_info *(*fib6_table_lookup)(struct net *net,
					      struct fib6_table *table,
					      int oif, struct flowi6 *fl6,
					      int flags);
	struct fib6_info *(*fib6_multipath_select)(const struct net *net,
						   struct fib6_info *f6i,
						   struct flowi6 *fl6, int oif,
						   const struct sk_buff *skb,
						   int strict);
	u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr,
				 struct in6_addr *saddr);

	void (*udpv6_encap_enable)(void);
	void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
			      const struct in6_addr *solicited_addr,
			      bool router, bool solicited, bool override, bool inc_opt);
	struct neigh_table *nd_tbl;
};
extern const struct ipv6_stub *ipv6_stub __read_mostly;

/* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
struct ipv6_bpf_stub {
	int (*inet6_bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len,
			  bool force_bind_address_no_port, bool with_lock);
	struct sock *(*udp6_lib_lookup)(struct net *net,
					const struct in6_addr *saddr, __be16 sport,
					const struct in6_addr *daddr, __be16 dport,
					int dif, int sdif, struct udp_table *tbl,
					struct sk_buff *skb);
};
extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;

/*
 * identify MLD packets for MLD filter exceptions
 */
static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
{
	struct icmp6hdr *hdr;

	if (nexthdr != IPPROTO_ICMPV6 ||
	    !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
		return false;

	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);

	switch (hdr->icmp6_type) {
	case ICMPV6_MGM_QUERY:
	case ICMPV6_MGM_REPORT:
	case ICMPV6_MGM_REDUCTION:
	case ICMPV6_MLD2_REPORT:
		return true;
	default:
		break;
	}
	return false;
}

void addrconf_prefix_rcv(struct net_device *dev,
			 u8 *opt, int len, bool sllao);

/*
 *	anycast prototypes (anycast.c)
 */
int ipv6_sock_ac_join(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
void ipv6_sock_ac_close(struct sock *sk);

int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
void ipv6_ac_destroy_dev(struct inet6_dev *idev);
bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
			 const struct in6_addr *addr);
bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
			     const struct in6_addr *addr);
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_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);
}

void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);

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

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

static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
{
	refcount_inc(&ifp->refcnt);
}


/*
 *	compute link-local solicited-node multicast address
 */

static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
					     struct in6_addr *solicited)
{
	ipv6_addr_set(solicited,
		      htonl(0xFF020000), 0,
		      htonl(0x1),
		      htonl(0xFF000000) | addr->s6_addr32[3]);
}

static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	__be64 *p = (__be64 *)addr;
	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
#else
	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
		addr->s6_addr32[1] | addr->s6_addr32[2] |
		(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
#endif
}

static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	__be64 *p = (__be64 *)addr;
	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
#else
	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
		addr->s6_addr32[1] | addr->s6_addr32[2] |
		(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
#endif
}

static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
{
	return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
}

static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	__be64 *p = (__be64 *)addr;
	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
		((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
		 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
#else
	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
		addr->s6_addr32[1] |
		(addr->s6_addr32[2] ^ htonl(0x00000001)) |
		(addr->s6_addr[12] ^ 0xff)) == 0;
#endif
}

#ifdef CONFIG_PROC_FS
int if6_proc_init(void);
void if6_proc_exit(void);
#endif

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _ADDRCONF_H
	3	#define _ADDRCONF_H
	4
bd11f074	5	#define MAX_RTR_SOLICITATIONS -1 /* unlimited */
1da177e4	6	#define RTR_SOLICITATION_INTERVAL (4*HZ)
bd11f074	7	#define RTR_SOLICITATION_MAX_INTERVAL (3600HZ) / 1 hour */
1da177e4 LT	8
	9	#define MIN_VALID_LIFETIME (23600) / 2 hours */
	10
	11	#define TEMP_VALID_LIFETIME (7*86400)
	12	#define TEMP_PREFERRED_LIFETIME (86400)
76f793e3	13	#define REGEN_MAX_RETRY (3)
1da177e4 LT	14	#define MAX_DESYNC_FACTOR (600)
	15
	16	#define ADDR_CHECK_FREQUENCY (120*HZ)
	17
	18	#define IPV6_MAX_ADDRESSES 16
	19
5c766d64 JP	20	#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1)
	21	#define ADDRCONF_TIMER_FUZZ (HZ / 4)
	22	#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
	23
242d3a49 WC	24	#define ADDRCONF_NOTIFY_PRIORITY 0
242d3a49 WC	25
c7dc89c0	26	#include <linux/in.h>
6a800d45 PM	27	#include <linux/in6.h>
6a800d45 PM	28
1da177e4 LT	29	struct prefix_info {
	30	__u8 type;
	31	__u8 length;
	32	__u8 prefix_len;
	33
	34	#if defined(__BIG_ENDIAN_BITFIELD)
	35	__u8 onlink : 1,
	36	autoconf : 1,
	37	reserved : 6;
	38	#elif defined(__LITTLE_ENDIAN_BITFIELD)
	39	__u8 reserved : 6,
	40	autoconf : 1,
	41	onlink : 1;
	42	#else
	43	#error "Please fix <asm/byteorder.h>"
	44	#endif
e69a4adc AV	45	__be32 valid;
	46	__be32 prefered;
	47	__be32 reserved2;
1da177e4 LT	48
	49	struct in6_addr prefix;
	50	};
	51
1da177e4 LT	52	#include <linux/netdevice.h>
1da177e4 LT	53	#include <net/if_inet6.h>
e4553edd	54	#include <net/ipv6.h>
1da177e4	55
3ad7d246 KJ	56	struct in6_validator_info {
	57	struct in6_addr i6vi_addr;
	58	struct inet6_dev *i6vi_dev;
de95e047	59	struct netlink_ext_ack *extack;
3ad7d246 KJ	60	};
3ad7d246 KJ	61
e6464b8c DA	62	struct ifa6_config {
	63	const struct in6_addr *pfx;
	64	unsigned int plen;
	65
	66	const struct in6_addr *peer_pfx;
	67
8308f3ff	68	u32 rt_priority;
e6464b8c DA	69	u32 ifa_flags;
	70	u32 preferred_lft;
	71	u32 valid_lft;
	72	u16 scope;
	73	};
	74
e8e54d3c JP	75	int addrconf_init(void);
e8e54d3c JP	76	void addrconf_cleanup(void);
1da177e4	77
e8e54d3c JP	78	int addrconf_add_ifaddr(struct net net, void __user arg);
	79	int addrconf_del_ifaddr(struct net net, void __user arg);
	80	int addrconf_set_dstaddr(struct net net, void __user arg);
1da177e4	81
e8e54d3c JP	82	int ipv6_chk_addr(struct net net, const struct in6_addr addr,
e8e54d3c JP	83	const struct net_device *dev, int strict);
c58da4c6	84	int ipv6_chk_addr_and_flags(struct net net, const struct in6_addr addr,
232378e8 DA	85	const struct net_device *dev, bool skip_dev_check,
232378e8 DA	86	int strict, u32 banned_flags);
bfeade08	87
59fbb3a6	88	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
e8e54d3c	89	int ipv6_chk_home_addr(struct net net, const struct in6_addr addr);
65d4ed92	90	#endif
52eeeb84	91
7df37ff3 CB	92	bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
	93	const unsigned int prefix_len,
	94	struct net_device *dev);
	95
e8e54d3c JP	96	int ipv6_chk_prefix(const struct in6_addr addr, struct net_device dev);
	97
	98	struct inet6_ifaddr ipv6_get_ifaddr(struct net net,
	99	const struct in6_addr *addr,
	100	struct net_device *dev, int strict);
	101
	102	int ipv6_dev_get_saddr(struct net net, const struct net_device dev,
	103	const struct in6_addr *daddr, unsigned int srcprefs,
	104	struct in6_addr *saddr);
	105	int __ipv6_get_lladdr(struct inet6_dev idev, struct in6_addr addr,
479840ff	106	u32 banned_flags);
e8e54d3c	107	int ipv6_get_lladdr(struct net_device dev, struct in6_addr addr,
479840ff	108	u32 banned_flags);
7016e062 JP	109	bool inet_rcv_saddr_equal(const struct sock sk, const struct sock sk2,
7016e062 JP	110	bool match_wildcard);
2dbb9b9e	111	bool inet_rcv_saddr_any(const struct sock *sk);
e8e54d3c JP	112	void addrconf_join_solict(struct net_device dev, const struct in6_addr addr);
e8e54d3c JP	113	void addrconf_leave_solict(struct inet6_dev idev, const struct in6_addr addr);
1da177e4	114
2ad3ed59 AA	115	void addrconf_add_linklocal(struct inet6_dev *idev,
	116	const struct in6_addr *addr, u32 flags);
	117
cc84b3c6 AA	118	int addrconf_prefix_rcv_add_addr(struct net net, struct net_device dev,
	119	const struct prefix_info *pinfo,
	120	struct inet6_dev *in6_dev,
	121	const struct in6_addr *addr, int addr_type,
	122	u32 addr_flags, bool sllao, bool tokenized,
	123	__u32 valid_lft, u32 prefered_lft);
	124
4d6f2859 YS	125	static inline void addrconf_addr_eui48_base(u8 eui, const char const addr)
	126	{
	127	memcpy(eui, addr, 3);
	128	eui[3] = 0xFF;
	129	eui[4] = 0xFE;
	130	memcpy(eui + 5, addr + 3, 3);
	131	}
	132
	133	static inline void addrconf_addr_eui48(u8 eui, const char const addr)
	134	{
	135	addrconf_addr_eui48_base(eui, addr);
	136	eui[0] ^= 2;
	137	}
	138
399e6f95 MB	139	static inline int addrconf_ifid_eui48(u8 eui, struct net_device dev)
	140	{
	141	if (dev->addr_len != ETH_ALEN)
	142	return -1;
399e6f95 MB	143
	144	/*
	145	* The zSeries OSA network cards can be shared among various
	146	* OS instances, but the OSA cards have only one MAC address.
	147	* This leads to duplicate address conflicts in conjunction
	148	* with IPv6 if more than one instance uses the same card.
	149	*
	150	* The driver for these cards can deliver a unique 16-bit
	151	* identifier for each instance sharing the same card. It is
	152	* placed instead of 0xFFFE in the interface identifier. The
	153	* "u" bit of the interface identifier is not inverted in this
	154	* case. Hence the resulting interface identifier has local
	155	* scope according to RFC2373.
	156	*/
4d6f2859 YS	157
	158	addrconf_addr_eui48_base(eui, dev->dev_addr);
	159
399e6f95 MB	160	if (dev->dev_id) {
	161	eui[3] = (dev->dev_id >> 8) & 0xFF;
	162	eui[4] = dev->dev_id & 0xFF;
	163	} else {
399e6f95 MB	164	eui[0] ^= 2;
399e6f95 MB	165	}
4d6f2859	166
399e6f95 MB	167	return 0;
	168	}
	169
4bed72e4	170	static inline unsigned long addrconf_timeout_fixup(u32 timeout,
95c96174	171	unsigned int unit)
4bed72e4 YH	172	{
	173	if (timeout == 0xffffffff)
	174	return ~0UL;
	175
	176	/*
	177	* Avoid arithmetic overflow.
	178	* Assuming unit is constant and non-zero, this "if" statement
	179	* will go away on 64bit archs.
	180	*/
	181	if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
	182	return LONG_MAX / unit;
	183
	184	return timeout;
	185	}
	186
	187	static inline int addrconf_finite_timeout(unsigned long timeout)
	188	{
	189	return ~timeout;
	190	}
	191
2a8cc6c8 YH	192	/*
	193	* IPv6 Address Label subsystem (addrlabel.c)
	194	*/
e8e54d3c JP	195	int ipv6_addr_label_init(void);
e8e54d3c JP	196	void ipv6_addr_label_cleanup(void);
a3fde2ad	197	int ipv6_addr_label_rtnl_register(void);
e8e54d3c JP	198	u32 ipv6_addr_label(struct net net, const struct in6_addr addr,
e8e54d3c JP	199	int type, int ifindex);
2a8cc6c8	200
1da177e4 LT	201	/*
	202	* multicast prototypes (mcast.c)
	203	*/
e8e54d3c JP	204	int ipv6_sock_mc_join(struct sock *sk, int ifindex,
	205	const struct in6_addr *addr);
	206	int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
	207	const struct in6_addr *addr);
8651be8f	208	void __ipv6_sock_mc_close(struct sock *sk);
e8e54d3c JP	209	void ipv6_sock_mc_close(struct sock *sk);
	210	bool inet6_mc_check(struct sock sk, const struct in6_addr mc_addr,
	211	const struct in6_addr *src_addr);
	212
	213	int ipv6_dev_mc_inc(struct net_device dev, const struct in6_addr addr);
	214	int __ipv6_dev_mc_dec(struct inet6_dev idev, const struct in6_addr addr);
	215	int ipv6_dev_mc_dec(struct net_device dev, const struct in6_addr addr);
	216	void ipv6_mc_up(struct inet6_dev *idev);
	217	void ipv6_mc_down(struct inet6_dev *idev);
	218	void ipv6_mc_unmap(struct inet6_dev *idev);
	219	void ipv6_mc_remap(struct inet6_dev *idev);
	220	void ipv6_mc_init_dev(struct inet6_dev *idev);
	221	void ipv6_mc_destroy_dev(struct inet6_dev *idev);
9afd85c9	222	int ipv6_mc_check_mld(struct sk_buff skb, struct sk_buff *skb_trimmed);
da13c59b	223	void addrconf_dad_failure(struct sk_buff skb, struct inet6_ifaddr ifp);
e8e54d3c JP	224
	225	bool ipv6_chk_mcast_addr(struct net_device dev, const struct in6_addr group,
	226	const struct in6_addr *src_addr);
	227
	228	void ipv6_mc_dad_complete(struct inet6_dev *idev);
5f81bd2e CW	229
	230	/* A stub used by vxlan module. This is ugly, ideally these
	231	* symbols should be built into the core kernel.
	232	*/
	233	struct ipv6_stub {
	234	int (ipv6_sock_mc_join)(struct sock sk, int ifindex,
	235	const struct in6_addr *addr);
	236	int (ipv6_sock_mc_drop)(struct sock sk, int ifindex,
	237	const struct in6_addr *addr);
343d60aa RP	238	int (ipv6_dst_lookup)(struct net net, struct sock *sk,
343d60aa RP	239	struct dst_entry *dst, struct flowi6 fl6);
65a2022e DA	240
	241	struct fib6_table (fib6_get_table)(struct net *net, u32 id);
	242	struct fib6_info (fib6_lookup)(struct net *net, int oif,
	243	struct flowi6 *fl6, int flags);
	244	struct fib6_info (fib6_table_lookup)(struct net *net,
	245	struct fib6_table *table,
	246	int oif, struct flowi6 *fl6,
	247	int flags);
	248	struct fib6_info (fib6_multipath_select)(const struct net *net,
	249	struct fib6_info *f6i,
	250	struct flowi6 *fl6, int oif,
	251	const struct sk_buff *skb,
	252	int strict);
901731b8 DA	253	u32 (ip6_mtu_from_fib6)(struct fib6_info f6i, struct in6_addr *daddr,
901731b8 DA	254	struct in6_addr *saddr);
65a2022e	255
5f81bd2e	256	void (*udpv6_encap_enable)(void);
38cf595b	257	void (ndisc_send_na)(struct net_device dev, const struct in6_addr *daddr,
f564f45c CW	258	const struct in6_addr *solicited_addr,
f564f45c CW	259	bool router, bool solicited, bool override, bool inc_opt);
e15a00aa	260	struct neigh_table *nd_tbl;
5f81bd2e CW	261	};
	262	extern const struct ipv6_stub *ipv6_stub __read_mostly;
	263
d74bad4e AI	264	/* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
	265	struct ipv6_bpf_stub {
	266	int (inet6_bind)(struct sock sk, struct sockaddr *uaddr, int addr_len,
	267	bool force_bind_address_no_port, bool with_lock);
8a615c6b JS	268	struct sock (udp6_lib_lookup)(struct net *net,
	269	const struct in6_addr *saddr, __be16 sport,
	270	const struct in6_addr *daddr, __be16 dport,
	271	int dif, int sdif, struct udp_table *tbl,
	272	struct sk_buff *skb);
d74bad4e AI	273	};
	274	extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
	275
daad1512 YH	276	/*
	277	* identify MLD packets for MLD filter exceptions
	278	*/
	279	static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
	280	{
	281	struct icmp6hdr *hdr;
	282
	283	if (nexthdr != IPPROTO_ICMPV6 \|\|
	284	!pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
	285	return false;
	286
	287	hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
	288
	289	switch (hdr->icmp6_type) {
	290	case ICMPV6_MGM_QUERY:
	291	case ICMPV6_MGM_REPORT:
	292	case ICMPV6_MGM_REDUCTION:
	293	case ICMPV6_MLD2_REPORT:
	294	return true;
	295	default:
	296	break;
	297	}
	298	return false;
	299	}
1da177e4	300
e8e54d3c JP	301	void addrconf_prefix_rcv(struct net_device *dev,
e8e54d3c JP	302	u8 *opt, int len, bool sllao);
1da177e4	303
1da177e4 LT	304	/*
	305	* anycast prototypes (anycast.c)
	306	*/
e8e54d3c JP	307	int ipv6_sock_ac_join(struct sock *sk, int ifindex,
	308	const struct in6_addr *addr);
	309	int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
	310	const struct in6_addr *addr);
	311	void ipv6_sock_ac_close(struct sock *sk);
	312
013b4d90	313	int __ipv6_dev_ac_inc(struct inet6_dev idev, const struct in6_addr addr);
e8e54d3c	314	int __ipv6_dev_ac_dec(struct inet6_dev idev, const struct in6_addr addr);
381f4dca	315	void ipv6_ac_destroy_dev(struct inet6_dev *idev);
e8e54d3c	316	bool ipv6_chk_acast_addr(struct net net, struct net_device dev,
7c90cc2d FLB	317	const struct in6_addr *addr);
	318	bool ipv6_chk_acast_addr_src(struct net net, struct net_device dev,
	319	const struct in6_addr *addr);
2384d025 JB	320	int ipv6_anycast_init(void);
2384d025 JB	321	void ipv6_anycast_cleanup(void);
1da177e4 LT	322
1da177e4 LT	323	/* Device notifier */
e8e54d3c JP	324	int register_inet6addr_notifier(struct notifier_block *nb);
	325	int unregister_inet6addr_notifier(struct notifier_block *nb);
	326	int inet6addr_notifier_call_chain(unsigned long val, void *v);
1da177e4	327
3ad7d246 KJ	328	int register_inet6addr_validator_notifier(struct notifier_block *nb);
	329	int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
	330	int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
	331
85b3daad DA	332	void inet6_netconf_notify_devconf(struct net *net, int event, int type,
85b3daad DA	333	int ifindex, struct ipv6_devconf *devconf);
d67b8c61	334
48daa3bb ED	335	/**
	336	* __in6_dev_get - get inet6_dev pointer from netdevice
	337	* @dev: network device
	338	*
	339	* Caller must hold rcu_read_lock or RTNL, because this function
	340	* does not take a reference on the inet6_dev.
	341	*/
	342	static inline struct inet6_dev __in6_dev_get(const struct net_device dev)
1da177e4	343	{
48daa3bb	344	return rcu_dereference_rtnl(dev->ip6_ptr);
1da177e4 LT	345	}
1da177e4 LT	346
bdb7cc64 SS	347	/**
	348	* __in6_dev_get_safely - get inet6_dev pointer from netdevice
	349	* @dev: network device
	350	*
	351	* This is a safer version of __in6_dev_get
	352	*/
	353	static inline struct inet6_dev __in6_dev_get_safely(const struct net_device dev)
	354	{
	355	if (likely(dev))
	356	return rcu_dereference_rtnl(dev->ip6_ptr);
	357	else
	358	return NULL;
	359	}
	360
48daa3bb ED	361	/**
	362	* in6_dev_get - get inet6_dev pointer from netdevice
	363	* @dev: network device
	364	*
	365	* This version can be used in any context, and takes a reference
	366	* on the inet6_dev. Callers must use in6_dev_put() later to
	367	* release this reference.
	368	*/
	369	static inline struct inet6_dev in6_dev_get(const struct net_device dev)
1da177e4	370	{
48daa3bb ED	371	struct inet6_dev *idev;
48daa3bb ED	372
8814c4b5	373	rcu_read_lock();
48daa3bb	374	idev = rcu_dereference(dev->ip6_ptr);
1da177e4	375	if (idev)
1be92460	376	refcount_inc(&idev->refcnt);
8814c4b5	377	rcu_read_unlock();
1da177e4 LT	378	return idev;
	379	}
	380
bba24896 JP	381	static inline struct neigh_parms __in6_dev_nd_parms_get_rcu(const struct net_device dev)
	382	{
	383	struct inet6_dev *idev = __in6_dev_get(dev);
	384
	385	return idev ? idev->nd_parms : NULL;
	386	}
	387
e8e54d3c	388	void in6_dev_finish_destroy(struct inet6_dev *idev);
1da177e4	389
48daa3bb	390	static inline void in6_dev_put(struct inet6_dev *idev)
1da177e4	391	{
1be92460	392	if (refcount_dec_and_test(&idev->refcnt))
1da177e4 LT	393	in6_dev_finish_destroy(idev);
	394	}
	395
12d94a80 ED	396	static inline void in6_dev_put_clear(struct inet6_dev **pidev)
	397	{
	398	struct inet6_dev idev = pidev;
	399
	400	if (idev) {
	401	in6_dev_put(idev);
	402	*pidev = NULL;
	403	}
	404	}
	405
48daa3bb ED	406	static inline void __in6_dev_put(struct inet6_dev *idev)
48daa3bb ED	407	{
1be92460	408	refcount_dec(&idev->refcnt);
48daa3bb	409	}
1da177e4	410
48daa3bb ED	411	static inline void in6_dev_hold(struct inet6_dev *idev)
48daa3bb ED	412	{
1be92460	413	refcount_inc(&idev->refcnt);
48daa3bb	414	}
1da177e4	415
e8e54d3c	416	void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
1da177e4 LT	417
	418	static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
	419	{
271201c0	420	if (refcount_dec_and_test(&ifp->refcnt))
1da177e4 LT	421	inet6_ifa_finish_destroy(ifp);
	422	}
	423
48daa3bb ED	424	static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
48daa3bb ED	425	{
271201c0	426	refcount_dec(&ifp->refcnt);
48daa3bb	427	}
1da177e4	428
48daa3bb ED	429	static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
48daa3bb ED	430	{
271201c0	431	refcount_inc(&ifp->refcnt);
48daa3bb	432	}
1da177e4	433
1da177e4 LT	434
	435	/*
	436	* compute link-local solicited-node multicast address
	437	*/
	438
	439	static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
	440	struct in6_addr *solicited)
	441	{
	442	ipv6_addr_set(solicited,
0e7b8dcd YH	443	htonl(0xFF020000), 0,
	444	htonl(0x1),
	445	htonl(0xFF000000) \| addr->s6_addr32[3]);
1da177e4 LT	446	}
1da177e4 LT	447
b27b28cb	448	static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
1da177e4	449	{
d1641565	450	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959	451	__be64 p = (__be64 )addr;
d1641565 YH	452	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(1))) == 0UL;
d1641565 YH	453	#else
48daa3bb	454	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	455	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	456	(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
d1641565	457	#endif
1da177e4 LT	458	}
1da177e4 LT	459
b27b28cb	460	static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
1da177e4	461	{
d1641565	462	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959	463	__be64 p = (__be64 )addr;
d1641565 YH	464	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \| (p[1] ^ cpu_to_be64(2))) == 0UL;
d1641565 YH	465	#else
48daa3bb	466	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
fed85383	467	addr->s6_addr32[1] \| addr->s6_addr32[2] \|
48daa3bb	468	(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
d1641565	469	#endif
1da177e4 LT	470	}
1da177e4 LT	471
b27b28cb	472	static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
c7dc89c0	473	{
48daa3bb	474	return (addr->s6_addr32[2] \| htonl(0x02000000)) == htonl(0x02005EFE);
c7dc89c0 FT	475	}
c7dc89c0 FT	476
ca97a644 YH	477	static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
ca97a644 YH	478	{
9d100774	479	#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
bc861959	480	__be64 p = (__be64 )addr;
9d100774 YH	481	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) \|
	482	((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
	483	cpu_to_be64(0xffffffffff000000UL))) == 0UL;
	484	#else
	485	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) \|
	486	addr->s6_addr32[1] \|
	487	(addr->s6_addr32[2] ^ htonl(0x00000001)) \|
	488	(addr->s6_addr[12] ^ 0xff)) == 0;
	489	#endif
ca97a644 YH	490	}
ca97a644 YH	491
20380731	492	#ifdef CONFIG_PROC_FS
e8e54d3c JP	493	int if6_proc_init(void);
e8e54d3c JP	494	void if6_proc_exit(void);
20380731 ACM	495	#endif
20380731 ACM	496
1da177e4	497	#endif