/* 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 */

/* TEMP_VALID_LIFETIME default value as specified in RFC 8981 3.8 */
#define TEMP_VALID_LIFETIME             (2*86400)       /* 2 days */
#define TEMP_PREFERRED_LIFETIME         (86400)         /* 24 hours */
#define REGEN_MIN_ADVANCE               (2)             /* 2 seconds */
#define REGEN_MAX_RETRY                 (3)
#define MAX_DESYNC_FACTOR               (600)

#define ADDR_CHECK_FREQUENCY            (120*HZ)

#define IPV6_MAX_ADDRESSES              16

#define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ / 50 : 1)
#define ADDRCONF_TIMER_FUZZ             (HZ / 4)
#define ADDRCONF_TIMER_FUZZ_MAX         (HZ)

#define ADDRCONF_NOTIFY_PRIORITY        0

#include <linux/in.h>
#include <linux/in6.h>

struct prefix_info {
        __u8                    type;
        __u8                    length;
        __u8                    prefix_len;

        union __packed {
                __u8            flags;
                struct __packed {
#if defined(__BIG_ENDIAN_BITFIELD)
                        __u8    onlink : 1,
                                autoconf : 1,
                                routeraddr : 1,
                                preferpd : 1,
                                reserved : 4;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
                        __u8    reserved : 4,
                                preferpd : 1,
                                routeraddr : 1,
                                autoconf : 1,
                                onlink : 1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
                };
        };
        __be32                  valid;
        __be32                  prefered;
        __be32                  reserved2;

        struct in6_addr         prefix;
};

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

#include <linux/ipv6.h>
#include <linux/netdevice.h>
#include <net/if_inet6.h>
#include <net/ipv6.h>

struct in6_validator_info {
        struct in6_addr         i6vi_addr;
        struct inet6_dev        *i6vi_dev;
        struct netlink_ext_ack  *extack;
};

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

        u8                      ifa_proto;

        const struct in6_addr   *peer_pfx;

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

enum addr_type_t {
        UNICAST_ADDR,
        MULTICAST_ADDR,
        ANYCAST_ADDR,
};

struct inet6_fill_args {
        u32 portid;
        u32 seq;
        int event;
        unsigned int flags;
        int netnsid;
        int ifindex;
        enum addr_type_t type;
        bool force_rt_scope_universe;
};

int addrconf_init(void);
void addrconf_cleanup(void);

int addrconf_add_ifaddr(struct net *net, void __user *arg);
int addrconf_del_ifaddr(struct net *net, void __user *arg);
int addrconf_set_dstaddr(struct net *net, void __user *arg);

int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
                  const struct net_device *dev, int strict);
int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
                            const struct net_device *dev, bool skip_dev_check,
                            int strict, u32 banned_flags);

#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
#endif

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

bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
                                   const unsigned int prefix_len,
                                   struct net_device *dev);

int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);

struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
                                 struct net_device *dev);

struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
                                     const struct in6_addr *addr,
                                     struct net_device *dev, int strict);

int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
                       const struct in6_addr *daddr, unsigned int srcprefs,
                       struct in6_addr *saddr);
int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
                    u32 banned_flags);
bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
                          bool match_wildcard);
bool inet_rcv_saddr_any(const struct sock *sk);
void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);

void addrconf_add_linklocal(struct inet6_dev *idev,
                            const struct in6_addr *addr, u32 flags);

int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
                                 const struct prefix_info *pinfo,
                                 struct inet6_dev *in6_dev,
                                 const struct in6_addr *addr, int addr_type,
                                 u32 addr_flags, bool sllao, bool tokenized,
                                 __u32 valid_lft, u32 prefered_lft);

static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
{
        memcpy(eui, addr, 3);
        eui[3] = 0xFF;
        eui[4] = 0xFE;
        memcpy(eui + 5, addr + 3, 3);
}

static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
{
        addrconf_addr_eui48_base(eui, addr);
        eui[0] ^= 2;
}

static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
{
        if (dev->addr_len != ETH_ALEN)
                return -1;

        /*
         * The zSeries OSA network cards can be shared among various
         * OS instances, but the OSA cards have only one MAC address.
         * This leads to duplicate address conflicts in conjunction
         * with IPv6 if more than one instance uses the same card.
         *
         * The driver for these cards can deliver a unique 16-bit
         * identifier for each instance sharing the same card.  It is
         * placed instead of 0xFFFE in the interface identifier.  The
         * "u" bit of the interface identifier is not inverted in this
         * case.  Hence the resulting interface identifier has local
         * scope according to RFC2373.
         */

        addrconf_addr_eui48_base(eui, dev->dev_addr);

        if (dev->dev_id) {
                eui[3] = (dev->dev_id >> 8) & 0xFF;
                eui[4] = dev->dev_id & 0xFF;
        } else {
                eui[0] ^= 2;
        }

        return 0;
}

#define INFINITY_LIFE_TIME 0xFFFFFFFF

static inline unsigned long addrconf_timeout_fixup(u32 timeout,
                                                   unsigned int unit)
{
        if (timeout == INFINITY_LIFE_TIME)
                return ~0UL;

        /*
         * Avoid arithmetic overflow.
         * Assuming unit is constant and non-zero, this "if" statement
         * will go away on 64bit archs.
         */
        if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
                return LONG_MAX / unit;

        return timeout;
}

static inline int addrconf_finite_timeout(unsigned long timeout)
{
        return ~timeout;
}

/*
 *      IPv6 Address Label subsystem (addrlabel.c)
 */
int ipv6_addr_label_init(void);
void ipv6_addr_label_cleanup(void);
int ipv6_addr_label_rtnl_register(void);
u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
                    int type, int ifindex);

/*
 *      multicast prototypes (mcast.c)
 */
static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
                                    unsigned int len)
{
        if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
                return false;

        return pskb_may_pull(skb, len);
}

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

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

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

void ipv6_mc_dad_complete(struct inet6_dev *idev);

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

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

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

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

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

/*
 *      anycast prototypes (anycast.c)
 */
int ipv6_sock_ac_join(struct sock *sk, int ifindex,
                      const struct in6_addr *addr);
int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
                      const struct in6_addr *addr);
void __ipv6_sock_ac_close(struct sock *sk);
void ipv6_sock_ac_close(struct sock *sk);

int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
void ipv6_ac_destroy_dev(struct inet6_dev *idev);
bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
                         const struct in6_addr *addr);
bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
                             const struct in6_addr *addr);
int ipv6_anycast_init(void);
void ipv6_anycast_cleanup(void);

/* Device notifier */
int register_inet6addr_notifier(struct notifier_block *nb);
int unregister_inet6addr_notifier(struct notifier_block *nb);
int inet6addr_notifier_call_chain(unsigned long val, void *v);

int register_inet6addr_validator_notifier(struct notifier_block *nb);
int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);

void inet6_netconf_notify_devconf(struct net *net, int event, int type,
                                  int ifindex, struct ipv6_devconf *devconf);

/**
 * __in6_dev_get - get inet6_dev pointer from netdevice
 * @dev: network device
 *
 * Caller must hold rcu_read_lock or RTNL, because this function
 * does not take a reference on the inet6_dev.
 */
static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
{
        return rcu_dereference_rtnl(dev->ip6_ptr);
}

static inline struct inet6_dev *in6_dev_rcu(const struct net_device *dev)
{
        return rcu_dereference(dev->ip6_ptr);
}

static inline struct inet6_dev *__in6_dev_get_rtnl_net(const struct net_device *dev)
{
        return rtnl_net_dereference(dev_net(dev), dev->ip6_ptr);
}

/**
 * __in6_dev_stats_get - get inet6_dev pointer for stats
 * @dev: network device
 * @skb: skb for original incoming interface if needed
 *
 * Caller must hold rcu_read_lock or RTNL, because this function
 * does not take a reference on the inet6_dev.
 */
static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
                                                    const struct sk_buff *skb)
{
        if (netif_is_l3_master(dev))
                dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
        return __in6_dev_get(dev);
}

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

/**
 * in6_dev_get - get inet6_dev pointer from netdevice
 * @dev: network device
 *
 * This version can be used in any context, and takes a reference
 * on the inet6_dev. Callers must use in6_dev_put() later to
 * release this reference.
 */
static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
{
        struct inet6_dev *idev;

        rcu_read_lock();
        idev = rcu_dereference(dev->ip6_ptr);
        if (idev)
                refcount_inc(&idev->refcnt);
        rcu_read_unlock();
        return idev;
}

static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
{
        struct inet6_dev *idev = __in6_dev_get(dev);

        return idev ? idev->nd_parms : NULL;
}

void in6_dev_finish_destroy(struct inet6_dev *idev);

static inline void in6_dev_put(struct inet6_dev *idev)
{
        if (refcount_dec_and_test(&idev->refcnt))
                in6_dev_finish_destroy(idev);
}

static inline void in6_dev_put_clear(struct inet6_dev **pidev)
{
        struct inet6_dev *idev = *pidev;

        if (idev) {
                in6_dev_put(idev);
                *pidev = NULL;
        }
}

static inline void __in6_dev_put(struct inet6_dev *idev)
{
        refcount_dec(&idev->refcnt);
}

static inline void in6_dev_hold(struct inet6_dev *idev)
{
        refcount_inc(&idev->refcnt);
}

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

        if (unlikely(!idev))
                return true;

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

void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);

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

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

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

static inline bool in6_ifa_hold_safe(struct inet6_ifaddr *ifp)
{
        return refcount_inc_not_zero(&ifp->refcnt);
}

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

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

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

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

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

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

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

        return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
                (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
#else
        return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
                addr->s6_addr32[1] | addr->s6_addr32[2] |
                (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
#endif
}

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

int inet6_fill_ifmcaddr(struct sk_buff *skb,
                        const struct ifmcaddr6 *ifmca,
                        struct inet6_fill_args *args);

int inet6_fill_ifacaddr(struct sk_buff *skb,
                        const struct ifacaddr6 *ifaca,
                        struct inet6_fill_args *args);
#endif