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net/ipv6/inet6_hashtables.c
8.06 KB
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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. * * Generic INET6 transport hashtables * |
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* Authors: Lotsa people, from code originally in tcp, generalised here * by Arnaldo Carvalho de Melo <acme@mandriva.com> |
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* * 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. */ |
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#include <linux/module.h> |
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#include <linux/random.h> |
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#include <net/inet_connection_sock.h> #include <net/inet_hashtables.h> #include <net/inet6_hashtables.h> |
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#include <net/secure_seq.h> |
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#include <net/ip.h> |
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int __inet6_hash(struct sock *sk, struct inet_timewait_sock *tw) |
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{ |
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struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
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int twrefcnt = 0; |
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WARN_ON(!sk_unhashed(sk)); |
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if (sk->sk_state == TCP_LISTEN) { |
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struct inet_listen_hashbucket *ilb; |
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ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; spin_lock(&ilb->lock); |
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__sk_nulls_add_node_rcu(sk, &ilb->head); |
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spin_unlock(&ilb->lock); |
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} else { unsigned int hash; |
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struct hlist_nulls_head *list; |
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spinlock_t *lock; |
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sk->sk_hash = hash = inet6_sk_ehashfn(sk); |
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list = &inet_ehash_bucket(hashinfo, hash)->chain; lock = inet_ehash_lockp(hashinfo, hash); |
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spin_lock(lock); |
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__sk_nulls_add_node_rcu(sk, list); |
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if (tw) { WARN_ON(sk->sk_hash != tw->tw_hash); twrefcnt = inet_twsk_unhash(tw); } |
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spin_unlock(lock); |
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} |
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
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return twrefcnt; |
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} EXPORT_SYMBOL(__inet6_hash); /* * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM * * The sockhash lock must be held as a reader here. */ |
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struct sock *__inet6_lookup_established(struct net *net, struct inet_hashinfo *hashinfo, |
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const struct in6_addr *saddr, |
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const __be16 sport, |
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const struct in6_addr *daddr, const u16 hnum, const int dif) { struct sock *sk; |
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const struct hlist_nulls_node *node; |
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const __portpair ports = INET_COMBINED_PORTS(sport, hnum); |
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/* Optimize here for direct hit, only listening connections can * have wildcards anyways. */ |
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unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport); |
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unsigned int slot = hash & hashinfo->ehash_mask; |
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struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; |
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rcu_read_lock(); begin: sk_nulls_for_each_rcu(sk, node, &head->chain) { |
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/* For IPV6 do the cheaper port and family tests first. */ |
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if (INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) goto begintw; if (!INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { sock_put(sk); goto begin; } goto out; } |
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} |
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if (get_nulls_value(node) != slot) goto begin; begintw: |
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/* Must check for a TIME_WAIT'er before going to listener hash. */ |
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sk_nulls_for_each_rcu(sk, node, &head->twchain) { if (INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) { sk = NULL; goto out; } if (!INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) { sock_put(sk); goto begintw; } goto out; } |
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} |
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if (get_nulls_value(node) != slot) goto begintw; sk = NULL; out: rcu_read_unlock(); |
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return sk; } EXPORT_SYMBOL(__inet6_lookup_established); |
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static inline int compute_score(struct sock *sk, struct net *net, |
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const unsigned short hnum, const struct in6_addr *daddr, const int dif) { int score = -1; |
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if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum && |
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sk->sk_family == PF_INET6) { const struct ipv6_pinfo *np = inet6_sk(sk); score = 1; if (!ipv6_addr_any(&np->rcv_saddr)) { if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) return -1; score++; } if (sk->sk_bound_dev_if) { if (sk->sk_bound_dev_if != dif) return -1; score++; } } return score; } |
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struct sock *inet6_lookup_listener(struct net *net, struct inet_hashinfo *hashinfo, const struct in6_addr *daddr, const unsigned short hnum, const int dif) |
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{ struct sock *sk; |
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const struct hlist_nulls_node *node; struct sock *result; int score, hiscore; unsigned int hash = inet_lhashfn(net, hnum); struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash]; rcu_read_lock(); begin: result = NULL; hiscore = -1; sk_nulls_for_each(sk, node, &ilb->head) { score = compute_score(sk, net, hnum, daddr, dif); if (score > hiscore) { hiscore = score; result = sk; |
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} } |
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/* * if the nulls value we got at the end of this lookup is * not the expected one, we must restart lookup. * We probably met an item that was moved to another chain. */ if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE) goto begin; if (result) { if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) result = NULL; else if (unlikely(compute_score(result, net, hnum, daddr, dif) < hiscore)) { sock_put(result); goto begin; } } rcu_read_unlock(); |
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return result; } EXPORT_SYMBOL_GPL(inet6_lookup_listener); |
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struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo, |
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const struct in6_addr *saddr, const __be16 sport, const struct in6_addr *daddr, const __be16 dport, |
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const int dif) { struct sock *sk; local_bh_disable(); |
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sk = __inet6_lookup(net, hashinfo, saddr, sport, daddr, ntohs(dport), dif); |
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local_bh_enable(); return sk; } EXPORT_SYMBOL_GPL(inet6_lookup); |
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static int __inet6_check_established(struct inet_timewait_death_row *death_row, struct sock *sk, const __u16 lport, struct inet_timewait_sock **twp) { struct inet_hashinfo *hinfo = death_row->hashinfo; |
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struct inet_sock *inet = inet_sk(sk); |
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const struct ipv6_pinfo *np = inet6_sk(sk); const struct in6_addr *daddr = &np->rcv_saddr; const struct in6_addr *saddr = &np->daddr; const int dif = sk->sk_bound_dev_if; |
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const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); |
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struct net *net = sock_net(sk); const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr, |
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inet->inet_dport); |
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struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
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spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
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struct sock *sk2; |
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const struct hlist_nulls_node *node; |
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struct inet_timewait_sock *tw; |
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int twrefcnt = 0; |
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spin_lock(lock); |
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/* Check TIME-WAIT sockets first. */ |
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sk_nulls_for_each(sk2, node, &head->twchain) { |
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tw = inet_twsk(sk2); |
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if (INET6_TW_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) { |
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if (twsk_unique(sk, sk2, twp)) goto unique; else goto not_unique; } } tw = NULL; /* And established part... */ |
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sk_nulls_for_each(sk2, node, &head->chain) { |
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if (INET6_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) |
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goto not_unique; } unique: |
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/* Must record num and sport now. Otherwise we will see * in hash table socket with a funny identity. */ |
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inet->inet_num = lport; inet->inet_sport = htons(lport); |
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sk->sk_hash = hash; |
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WARN_ON(!sk_unhashed(sk)); |
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__sk_nulls_add_node_rcu(sk, &head->chain); |
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if (tw) { twrefcnt = inet_twsk_unhash(tw); NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED); } |
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spin_unlock(lock); |
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if (twrefcnt) inet_twsk_put(tw); |
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
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if (twp) { |
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*twp = tw; |
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} else if (tw) { |
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/* Silly. Should hash-dance instead... */ inet_twsk_deschedule(tw, death_row); |
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inet_twsk_put(tw); } return 0; not_unique: |
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spin_unlock(lock); |
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return -EADDRNOTAVAIL; } static inline u32 inet6_sk_port_offset(const struct sock *sk) { const struct inet_sock *inet = inet_sk(sk); const struct ipv6_pinfo *np = inet6_sk(sk); return secure_ipv6_port_ephemeral(np->rcv_saddr.s6_addr32, np->daddr.s6_addr32, |
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inet->inet_dport); |
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} int inet6_hash_connect(struct inet_timewait_death_row *death_row, struct sock *sk) { |
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return __inet_hash_connect(death_row, sk, inet6_sk_port_offset(sk), |
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__inet6_check_established, __inet6_hash); |
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} EXPORT_SYMBOL_GPL(inet6_hash_connect); |