/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the BSD Socket
 *              interface as the means of communication with the user level.
 *
 * Authors:     Lotsa people, from code originally in tcp
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#ifndef _INET_HASHTABLES_H
#define _INET_HASHTABLES_H


#include <linux/interrupt.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/wait.h>

#include <net/inet_connection_sock.h>
#include <net/inet_sock.h>
#include <net/sock.h>
#include <net/route.h>
#include <net/tcp_states.h>
#include <net/netns/hash.h>

#include <linux/atomic.h>
#include <asm/byteorder.h>

/* This is for all connections with a full identity, no wildcards.
 * The 'e' prefix stands for Establish, but we really put all sockets
 * but LISTEN ones.
 */
struct inet_ehash_bucket {
        struct hlist_nulls_head chain;
};

/* There are a few simple rules, which allow for local port reuse by
 * an application.  In essence:
 *
 *      1) Sockets bound to different interfaces may share a local port.
 *         Failing that, goto test 2.
 *      2) If all sockets have sk->sk_reuse set, and none of them are in
 *         TCP_LISTEN state, the port may be shared.
 *         Failing that, goto test 3.
 *      3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local
 *         address, and none of them are the same, the port may be
 *         shared.
 *         Failing this, the port cannot be shared.
 *
 * The interesting point, is test #2.  This is what an FTP server does
 * all day.  To optimize this case we use a specific flag bit defined
 * below.  As we add sockets to a bind bucket list, we perform a
 * check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN))
 * As long as all sockets added to a bind bucket pass this test,
 * the flag bit will be set.
 * The resulting situation is that tcp_v[46]_verify_bind() can just check
 * for this flag bit, if it is set and the socket trying to bind has
 * sk->sk_reuse set, we don't even have to walk the owners list at all,
 * we return that it is ok to bind this socket to the requested local port.
 *
 * Sounds like a lot of work, but it is worth it.  In a more naive
 * implementation (ie. current FreeBSD etc.) the entire list of ports
 * must be walked for each data port opened by an ftp server.  Needless
 * to say, this does not scale at all.  With a couple thousand FTP
 * users logged onto your box, isn't it nice to know that new data
 * ports are created in O(1) time?  I thought so. ;-)   -DaveM
 */
struct inet_bind_bucket {
        possible_net_t          ib_net;
        unsigned short          port;
        signed char             fastreuse;
        signed char             fastreuseport;
        kuid_t                  fastuid;
        int                     num_owners;
        struct hlist_node       node;
        struct hlist_head       owners;
};

static inline struct net *ib_net(struct inet_bind_bucket *ib)
{
        return read_pnet(&ib->ib_net);
}

#define inet_bind_bucket_for_each(tb, head) \
        hlist_for_each_entry(tb, head, node)

struct inet_bind_hashbucket {
        spinlock_t              lock;
        struct hlist_head       chain;
};

/*
 * Sockets can be hashed in established or listening table
 * We must use different 'nulls' end-of-chain value for listening
 * hash table, or we might find a socket that was closed and
 * reallocated/inserted into established hash table
 */
#define LISTENING_NULLS_BASE (1U << 29)
struct inet_listen_hashbucket {
        spinlock_t              lock;
        struct hlist_nulls_head head;
};

/* This is for listening sockets, thus all sockets which possess wildcards. */
#define INET_LHTABLE_SIZE       32      /* Yes, really, this is all you need. */

struct inet_hashinfo {
        /* This is for sockets with full identity only.  Sockets here will
         * always be without wildcards and will have the following invariant:
         *
         *          TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
         *
         */
        struct inet_ehash_bucket        *ehash;
        spinlock_t                      *ehash_locks;
        unsigned int                    ehash_mask;
        unsigned int                    ehash_locks_mask;

        /* Ok, let's try this, I give up, we do need a local binding
         * TCP hash as well as the others for fast bind/connect.
         */
        struct inet_bind_hashbucket     *bhash;

        unsigned int                    bhash_size;
        /* 4 bytes hole on 64 bit */

        struct kmem_cache               *bind_bucket_cachep;

        /* All the above members are written once at bootup and
         * never written again _or_ are predominantly read-access.
         *
         * Now align to a new cache line as all the following members
         * might be often dirty.
         */
        /* All sockets in TCP_LISTEN state will be in here.  This is the only
         * table where wildcard'd TCP sockets can exist.  Hash function here
         * is just local port number.
         */
        struct inet_listen_hashbucket   listening_hash[INET_LHTABLE_SIZE]
                                        ____cacheline_aligned_in_smp;
};

static inline struct inet_ehash_bucket *inet_ehash_bucket(
        struct inet_hashinfo *hashinfo,
        unsigned int hash)
{
        return &hashinfo->ehash[hash & hashinfo->ehash_mask];
}

static inline spinlock_t *inet_ehash_lockp(
        struct inet_hashinfo *hashinfo,
        unsigned int hash)
{
        return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
}

int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo);

static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
{
        kvfree(hashinfo->ehash_locks);
        hashinfo->ehash_locks = NULL;
}

struct inet_bind_bucket *
inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
                        struct inet_bind_hashbucket *head,
                        const unsigned short snum);
void inet_bind_bucket_destroy(struct kmem_cache *cachep,
                              struct inet_bind_bucket *tb);

static inline u32 inet_bhashfn(const struct net *net, const __u16 lport,
                               const u32 bhash_size)
{
        return (lport + net_hash_mix(net)) & (bhash_size - 1);
}

void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
                    const unsigned short snum);

/* These can have wildcards, don't try too hard. */
static inline u32 inet_lhashfn(const struct net *net, const unsigned short num)
{
        return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
}

static inline int inet_sk_listen_hashfn(const struct sock *sk)
{
        return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
}

/* Caller must disable local BH processing. */
int __inet_inherit_port(const struct sock *sk, struct sock *child);

void inet_put_port(struct sock *sk);

void inet_hashinfo_init(struct inet_hashinfo *h);

bool inet_ehash_insert(struct sock *sk, struct sock *osk);
bool inet_ehash_nolisten(struct sock *sk, struct sock *osk);
int __inet_hash(struct sock *sk, struct sock *osk,
                int (*saddr_same)(const struct sock *sk1,
                                  const struct sock *sk2,
                                  bool match_wildcard));
int inet_hash(struct sock *sk);
void inet_unhash(struct sock *sk);

struct sock *__inet_lookup_listener(struct net *net,
                                    struct inet_hashinfo *hashinfo,
                                    struct sk_buff *skb, int doff,
                                    const __be32 saddr, const __be16 sport,
                                    const __be32 daddr,
                                    const unsigned short hnum,
                                    const int dif);

static inline struct sock *inet_lookup_listener(struct net *net,
                struct inet_hashinfo *hashinfo,
                struct sk_buff *skb, int doff,
                __be32 saddr, __be16 sport,
                __be32 daddr, __be16 dport, int dif)
{
        return __inet_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
                                      daddr, ntohs(dport), dif);
}

/* Socket demux engine toys. */
/* What happens here is ugly; there's a pair of adjacent fields in
   struct inet_sock; __be16 dport followed by __u16 num.  We want to
   search by pair, so we combine the keys into a single 32bit value
   and compare with 32bit value read from &...->dport.  Let's at least
   make sure that it's not mixed with anything else...
   On 64bit targets we combine comparisons with pair of adjacent __be32
   fields in the same way.
*/
#ifdef __BIG_ENDIAN
#define INET_COMBINED_PORTS(__sport, __dport) \
        ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
#else /* __LITTLE_ENDIAN */
#define INET_COMBINED_PORTS(__sport, __dport) \
        ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
#endif

#if (BITS_PER_LONG == 64)
#ifdef __BIG_ENDIAN
#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
        const __addrpair __name = (__force __addrpair) ( \
                                   (((__force __u64)(__be32)(__saddr)) << 32) | \
                                   ((__force __u64)(__be32)(__daddr)))
#else /* __LITTLE_ENDIAN */
#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
        const __addrpair __name = (__force __addrpair) ( \
                                   (((__force __u64)(__be32)(__daddr)) << 32) | \
                                   ((__force __u64)(__be32)(__saddr)))
#endif /* __BIG_ENDIAN */
#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif)     \
        (((__sk)->sk_portpair == (__ports))                     &&      \
         ((__sk)->sk_addrpair == (__cookie))                    &&      \
         (!(__sk)->sk_bound_dev_if      ||                              \
           ((__sk)->sk_bound_dev_if == (__dif)))                &&      \
         net_eq(sock_net(__sk), (__net)))
#else /* 32-bit arch */
#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
        const int __name __deprecated __attribute__((unused))

#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
        (((__sk)->sk_portpair == (__ports))             &&              \
         ((__sk)->sk_daddr      == (__saddr))           &&              \
         ((__sk)->sk_rcv_saddr  == (__daddr))           &&              \
         (!(__sk)->sk_bound_dev_if      ||                              \
           ((__sk)->sk_bound_dev_if == (__dif)))        &&              \
         net_eq(sock_net(__sk), (__net)))
#endif /* 64-bit arch */

/*
 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
 * not check it for lookups anymore, thanks Alexey. -DaveM
 *
 * Local BH must be disabled here.
 */
struct sock *__inet_lookup_established(struct net *net,
                                       struct inet_hashinfo *hashinfo,
                                       const __be32 saddr, const __be16 sport,
                                       const __be32 daddr, const u16 hnum,
                                       const int dif);

static inline struct sock *
        inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
                                const __be32 saddr, const __be16 sport,
                                const __be32 daddr, const __be16 dport,
                                const int dif)
{
        return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
                                         ntohs(dport), dif);
}

static inline struct sock *__inet_lookup(struct net *net,
                                         struct inet_hashinfo *hashinfo,
                                         struct sk_buff *skb, int doff,
                                         const __be32 saddr, const __be16 sport,
                                         const __be32 daddr, const __be16 dport,
                                         const int dif)
{
        u16 hnum = ntohs(dport);
        struct sock *sk = __inet_lookup_established(net, hashinfo,
                                saddr, sport, daddr, hnum, dif);

        return sk ? : __inet_lookup_listener(net, hashinfo, skb, doff, saddr,
                                             sport, daddr, hnum, dif);
}

static inline struct sock *inet_lookup(struct net *net,
                                       struct inet_hashinfo *hashinfo,
                                       struct sk_buff *skb, int doff,
                                       const __be32 saddr, const __be16 sport,
                                       const __be32 daddr, const __be16 dport,
                                       const int dif)
{
        struct sock *sk;

        local_bh_disable();
        sk = __inet_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
                           dport, dif);
        local_bh_enable();

        return sk;
}

static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
                                             struct sk_buff *skb,
                                             int doff,
                                             const __be16 sport,
                                             const __be16 dport)
{
        struct sock *sk = skb_steal_sock(skb);
        const struct iphdr *iph = ip_hdr(skb);

        if (sk)
                return sk;
        else
                return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
                                     doff, iph->saddr, sport,
                                     iph->daddr, dport, inet_iif(skb));
}

u32 sk_ehashfn(const struct sock *sk);
u32 inet6_ehashfn(const struct net *net,
                  const struct in6_addr *laddr, const u16 lport,
                  const struct in6_addr *faddr, const __be16 fport);

static inline void sk_daddr_set(struct sock *sk, __be32 addr)
{
        sk->sk_daddr = addr; /* alias of inet_daddr */
#if IS_ENABLED(CONFIG_IPV6)
        ipv6_addr_set_v4mapped(addr, &sk->sk_v6_daddr);
#endif
}

static inline void sk_rcv_saddr_set(struct sock *sk, __be32 addr)
{
        sk->sk_rcv_saddr = addr; /* alias of inet_rcv_saddr */
#if IS_ENABLED(CONFIG_IPV6)
        ipv6_addr_set_v4mapped(addr, &sk->sk_v6_rcv_saddr);
#endif
}

int __inet_hash_connect(struct inet_timewait_death_row *death_row,
                        struct sock *sk, u32 port_offset,
                        int (*check_established)(struct inet_timewait_death_row *,
                                                 struct sock *, __u16,
                                                 struct inet_timewait_sock **));

int inet_hash_connect(struct inet_timewait_death_row *death_row,
                      struct sock *sk);
#endif /* _INET_HASHTABLES_H */