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include/net/inet_hashtables.h
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/* * 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 |
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#include <linux/interrupt.h> |
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#include <linux/ip.h> |
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#include <linux/ipv6.h> |
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#include <linux/list.h> #include <linux/slab.h> |
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#include <linux/socket.h> |
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#include <linux/spinlock.h> |
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#include <linux/types.h> |
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#include <linux/wait.h> |
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#include <linux/vmalloc.h> |
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#include <net/inet_connection_sock.h> |
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#include <net/inet_sock.h> |
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#include <net/sock.h> |
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#include <net/route.h> |
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#include <net/tcp_states.h> |
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#include <net/netns/hash.h> |
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#include <linux/atomic.h> |
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#include <asm/byteorder.h> |
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/* This is for all connections with a full identity, no wildcards. |
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* One chain is dedicated to TIME_WAIT sockets. * I'll experiment with dynamic table growth later. |
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*/ struct inet_ehash_bucket { |
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struct hlist_nulls_head chain; struct hlist_nulls_head twchain; |
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}; |
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/* 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 { |
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#ifdef CONFIG_NET_NS |
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struct net *ib_net; |
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#endif |
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unsigned short port; signed short fastreuse; |
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int num_owners; |
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struct hlist_node node; struct hlist_head owners; }; |
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static inline struct net *ib_net(struct inet_bind_bucket *ib) { return read_pnet(&ib->ib_net); } |
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#define inet_bind_bucket_for_each(tb, pos, head) \ hlist_for_each_entry(tb, pos, head, node) |
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struct inet_bind_hashbucket { spinlock_t lock; struct hlist_head chain; }; |
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/* * 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) |
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struct inet_listen_hashbucket { spinlock_t lock; |
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struct hlist_nulls_head head; |
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}; |
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/* 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 * |
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* TIME_WAIT sockets use a separate chain (twchain). |
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*/ struct inet_ehash_bucket *ehash; |
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spinlock_t *ehash_locks; |
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unsigned int ehash_mask; |
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unsigned int ehash_locks_mask; |
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/* 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; |
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unsigned int bhash_size; |
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/* 4 bytes hole on 64 bit */ |
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|
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struct kmem_cache *bind_bucket_cachep; |
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/* 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 |
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* 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. |
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*/ |
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struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE] ____cacheline_aligned_in_smp; |
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atomic_t bsockets; |
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}; |
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static inline struct inet_ehash_bucket *inet_ehash_bucket( struct inet_hashinfo *hashinfo, unsigned int hash) { |
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return &hashinfo->ehash[hash & hashinfo->ehash_mask]; |
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} |
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static inline spinlock_t *inet_ehash_lockp( |
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struct inet_hashinfo *hashinfo, unsigned int hash) { return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask]; } static inline int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo) { unsigned int i, size = 256; #if defined(CONFIG_PROVE_LOCKING) unsigned int nr_pcpus = 2; #else unsigned int nr_pcpus = num_possible_cpus(); #endif if (nr_pcpus >= 4) size = 512; if (nr_pcpus >= 8) size = 1024; if (nr_pcpus >= 16) size = 2048; if (nr_pcpus >= 32) size = 4096; |
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if (sizeof(spinlock_t) != 0) { |
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#ifdef CONFIG_NUMA |
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if (size * sizeof(spinlock_t) > PAGE_SIZE) hashinfo->ehash_locks = vmalloc(size * sizeof(spinlock_t)); |
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else #endif |
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hashinfo->ehash_locks = kmalloc(size * sizeof(spinlock_t), |
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GFP_KERNEL); if (!hashinfo->ehash_locks) return ENOMEM; for (i = 0; i < size; i++) |
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spin_lock_init(&hashinfo->ehash_locks[i]); |
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} hashinfo->ehash_locks_mask = size - 1; return 0; } static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo) { if (hashinfo->ehash_locks) { #ifdef CONFIG_NUMA unsigned int size = (hashinfo->ehash_locks_mask + 1) * |
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sizeof(spinlock_t); |
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if (size > PAGE_SIZE) vfree(hashinfo->ehash_locks); else |
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#endif |
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kfree(hashinfo->ehash_locks); |
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hashinfo->ehash_locks = NULL; } } |
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extern struct inet_bind_bucket * |
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inet_bind_bucket_create(struct kmem_cache *cachep, |
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struct net *net, |
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struct inet_bind_hashbucket *head, const unsigned short snum); |
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extern void inet_bind_bucket_destroy(struct kmem_cache *cachep, |
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struct inet_bind_bucket *tb); |
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static inline int inet_bhashfn(struct net *net, const __u16 lport, const int bhash_size) |
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{ |
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return (lport + net_hash_mix(net)) & (bhash_size - 1); |
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} |
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extern void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb, const unsigned short snum); |
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/* These can have wildcards, don't try too hard. */ |
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static inline int inet_lhashfn(struct net *net, const unsigned short num) |
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{ |
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return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1); |
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} static inline int inet_sk_listen_hashfn(const struct sock *sk) { |
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return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num); |
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} |
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/* Caller must disable local BH processing. */ |
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extern int __inet_inherit_port(struct sock *sk, struct sock *child); |
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extern void inet_put_port(struct sock *sk); |
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void inet_hashinfo_init(struct inet_hashinfo *h); |
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extern int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw); |
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extern void inet_hash(struct sock *sk); extern void inet_unhash(struct sock *sk); |
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|
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extern struct sock *__inet_lookup_listener(struct net *net, struct inet_hashinfo *hashinfo, |
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const __be32 daddr, |
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const unsigned short hnum, const int dif); |
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static inline struct sock *inet_lookup_listener(struct net *net, struct inet_hashinfo *hashinfo, __be32 daddr, __be16 dport, int dif) |
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{ |
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return __inet_lookup_listener(net, hashinfo, daddr, ntohs(dport), dif); |
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} |
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/* Socket demux engine toys. */ |
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/* 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. */ typedef __u32 __bitwise __portpair; |
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#ifdef __BIG_ENDIAN #define INET_COMBINED_PORTS(__sport, __dport) \ |
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((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport))) |
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#else /* __LITTLE_ENDIAN */ #define INET_COMBINED_PORTS(__sport, __dport) \ |
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((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport))) |
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#endif #if (BITS_PER_LONG == 64) |
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typedef __u64 __bitwise __addrpair; |
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#ifdef __BIG_ENDIAN #define INET_ADDR_COOKIE(__name, __saddr, __daddr) \ |
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const __addrpair __name = (__force __addrpair) ( \ (((__force __u64)(__be32)(__saddr)) << 32) | \ ((__force __u64)(__be32)(__daddr))); |
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#else /* __LITTLE_ENDIAN */ #define INET_ADDR_COOKIE(__name, __saddr, __daddr) \ |
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const __addrpair __name = (__force __addrpair) ( \ (((__force __u64)(__be32)(__daddr)) << 32) | \ ((__force __u64)(__be32)(__saddr))); |
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#endif /* __BIG_ENDIAN */ |
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#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\ |
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(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \ |
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((*((__addrpair *)&(inet_sk(__sk)->inet_daddr))) == (__cookie)) && \ ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \ |
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(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) |
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#define INET_TW_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\ |
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(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \ |
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((*((__addrpair *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) && \ ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \ |
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(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) #else /* 32-bit arch */ #define INET_ADDR_COOKIE(__name, __saddr, __daddr) |
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#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif) \ |
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(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \ |
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(inet_sk(__sk)->inet_daddr == (__saddr)) && \ (inet_sk(__sk)->inet_rcv_saddr == (__daddr)) && \ ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \ |
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(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) |
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#define INET_TW_MATCH(__sk, __net, __hash,__cookie, __saddr, __daddr, __ports, __dif) \ |
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(((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \ |
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(inet_twsk(__sk)->tw_daddr == (__saddr)) && \ |
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(inet_twsk(__sk)->tw_rcv_saddr == (__daddr)) && \ |
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((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \ |
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(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) #endif /* 64-bit arch */ |
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/* * 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. */ |
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extern struct sock * __inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo, |
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const __be32 saddr, const __be16 sport, const __be32 daddr, const u16 hnum, const int dif); |
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|
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static inline struct sock * |
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inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo, |
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const __be32 saddr, const __be16 sport, const __be32 daddr, const __be16 dport, |
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const int dif) { |
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return __inet_lookup_established(net, hashinfo, saddr, sport, daddr, |
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ntohs(dport), dif); } |
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static inline struct sock *__inet_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
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const __be32 saddr, const __be16 sport, const __be32 daddr, const __be16 dport, |
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const int dif) { |
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u16 hnum = ntohs(dport); |
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struct sock *sk = __inet_lookup_established(net, hashinfo, saddr, sport, daddr, hnum, dif); return sk ? : __inet_lookup_listener(net, hashinfo, daddr, hnum, dif); |
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} |
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static inline struct sock *inet_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
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const __be32 saddr, const __be16 sport, const __be32 daddr, const __be16 dport, |
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const int dif) { struct sock *sk; local_bh_disable(); |
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sk = __inet_lookup(net, hashinfo, saddr, sport, daddr, dport, dif); |
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local_bh_enable(); return sk; } |
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static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo, struct sk_buff *skb, const __be16 sport, const __be16 dport) { |
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struct sock *sk; |
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const struct iphdr *iph = ip_hdr(skb); |
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if (unlikely(sk = skb_steal_sock(skb))) return sk; else |
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return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo, |
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iph->saddr, sport, iph->daddr, dport, inet_iif(skb)); |
9a1f27c48 inet_hashtables: ... |
373 |
} |
5ee31fc1e [INET]: Consolida... |
374 |
extern int __inet_hash_connect(struct inet_timewait_death_row *death_row, |
9327f7053 tcp: Fix a connec... |
375 376 |
struct sock *sk, u32 port_offset, |
5ee31fc1e [INET]: Consolida... |
377 378 |
int (*check_established)(struct inet_timewait_death_row *, struct sock *, __u16, struct inet_timewait_sock **), |
9327f7053 tcp: Fix a connec... |
379 |
int (*hash)(struct sock *sk, struct inet_timewait_sock *twp)); |
a7f5e7f16 [INET]: Generalis... |
380 381 |
extern int inet_hash_connect(struct inet_timewait_death_row *death_row, struct sock *sk); |
304a16180 [INET]: Move the ... |
382 |
#endif /* _INET_HASHTABLES_H */ |