![Eric Dumazet](/assets/img/avatar_default.png)
__inet_hash_connect() does not use its third argument (port_offset) if socket was already bound to a source port. No need to perform useless but expensive md5 computations. Reported-by: Crestez Dan Leonard <cdleonard@gmail.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
654 lines
17 KiB
C
654 lines
17 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Generic INET transport hashtables
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*
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* Authors: Lotsa people, from code originally in tcp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/sched.h>
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#include <linux/slab.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_hashtables.h>
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#include <net/secure_seq.h>
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#include <net/ip.h>
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static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
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const __u16 lport, const __be32 faddr,
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const __be16 fport)
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{
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static u32 inet_ehash_secret __read_mostly;
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net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
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return __inet_ehashfn(laddr, lport, faddr, fport,
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inet_ehash_secret + net_hash_mix(net));
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}
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/* This function handles inet_sock, but also timewait and request sockets
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* for IPv4/IPv6.
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*/
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u32 sk_ehashfn(const struct sock *sk)
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{
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#if IS_ENABLED(CONFIG_IPV6)
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if (sk->sk_family == AF_INET6 &&
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!ipv6_addr_v4mapped(&sk->sk_v6_daddr))
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return inet6_ehashfn(sock_net(sk),
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&sk->sk_v6_rcv_saddr, sk->sk_num,
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&sk->sk_v6_daddr, sk->sk_dport);
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#endif
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return inet_ehashfn(sock_net(sk),
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sk->sk_rcv_saddr, sk->sk_num,
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sk->sk_daddr, sk->sk_dport);
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}
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/*
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* Allocate and initialize a new local port bind bucket.
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* The bindhash mutex for snum's hash chain must be held here.
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*/
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struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
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struct net *net,
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struct inet_bind_hashbucket *head,
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const unsigned short snum)
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{
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struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
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if (tb) {
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write_pnet(&tb->ib_net, net);
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tb->port = snum;
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tb->fastreuse = 0;
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tb->fastreuseport = 0;
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tb->num_owners = 0;
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INIT_HLIST_HEAD(&tb->owners);
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hlist_add_head(&tb->node, &head->chain);
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}
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return tb;
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}
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/*
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* Caller must hold hashbucket lock for this tb with local BH disabled
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*/
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void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
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{
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if (hlist_empty(&tb->owners)) {
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__hlist_del(&tb->node);
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kmem_cache_free(cachep, tb);
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}
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}
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void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
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const unsigned short snum)
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{
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inet_sk(sk)->inet_num = snum;
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sk_add_bind_node(sk, &tb->owners);
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tb->num_owners++;
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inet_csk(sk)->icsk_bind_hash = tb;
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}
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/*
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* Get rid of any references to a local port held by the given sock.
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*/
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static void __inet_put_port(struct sock *sk)
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{
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struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
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const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num,
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hashinfo->bhash_size);
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struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
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struct inet_bind_bucket *tb;
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spin_lock(&head->lock);
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tb = inet_csk(sk)->icsk_bind_hash;
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__sk_del_bind_node(sk);
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tb->num_owners--;
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inet_csk(sk)->icsk_bind_hash = NULL;
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inet_sk(sk)->inet_num = 0;
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inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
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spin_unlock(&head->lock);
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}
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void inet_put_port(struct sock *sk)
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{
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local_bh_disable();
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__inet_put_port(sk);
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local_bh_enable();
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}
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EXPORT_SYMBOL(inet_put_port);
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int __inet_inherit_port(struct sock *sk, struct sock *child)
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{
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struct inet_hashinfo *table = sk->sk_prot->h.hashinfo;
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unsigned short port = inet_sk(child)->inet_num;
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const int bhash = inet_bhashfn(sock_net(sk), port,
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table->bhash_size);
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struct inet_bind_hashbucket *head = &table->bhash[bhash];
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struct inet_bind_bucket *tb;
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spin_lock(&head->lock);
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tb = inet_csk(sk)->icsk_bind_hash;
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if (tb->port != port) {
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/* NOTE: using tproxy and redirecting skbs to a proxy
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* on a different listener port breaks the assumption
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* that the listener socket's icsk_bind_hash is the same
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* as that of the child socket. We have to look up or
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* create a new bind bucket for the child here. */
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inet_bind_bucket_for_each(tb, &head->chain) {
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if (net_eq(ib_net(tb), sock_net(sk)) &&
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tb->port == port)
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break;
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}
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if (!tb) {
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tb = inet_bind_bucket_create(table->bind_bucket_cachep,
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sock_net(sk), head, port);
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if (!tb) {
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spin_unlock(&head->lock);
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return -ENOMEM;
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}
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}
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}
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inet_bind_hash(child, tb, port);
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spin_unlock(&head->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(__inet_inherit_port);
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static inline int compute_score(struct sock *sk, struct net *net,
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const unsigned short hnum, const __be32 daddr,
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const int dif)
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{
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int score = -1;
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struct inet_sock *inet = inet_sk(sk);
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if (net_eq(sock_net(sk), net) && inet->inet_num == hnum &&
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!ipv6_only_sock(sk)) {
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__be32 rcv_saddr = inet->inet_rcv_saddr;
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score = sk->sk_family == PF_INET ? 2 : 1;
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if (rcv_saddr) {
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if (rcv_saddr != daddr)
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return -1;
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score += 4;
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}
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if (sk->sk_bound_dev_if) {
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if (sk->sk_bound_dev_if != dif)
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return -1;
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score += 4;
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}
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}
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return score;
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}
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/*
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* Don't inline this cruft. Here are some nice properties to exploit here. The
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* BSD API does not allow a listening sock to specify the remote port nor the
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* remote address for the connection. So always assume those are both
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* wildcarded during the search since they can never be otherwise.
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*/
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struct sock *__inet_lookup_listener(struct net *net,
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struct inet_hashinfo *hashinfo,
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const __be32 saddr, __be16 sport,
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const __be32 daddr, const unsigned short hnum,
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const int dif)
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{
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struct sock *sk, *result;
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struct hlist_nulls_node *node;
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unsigned int hash = inet_lhashfn(net, hnum);
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struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
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int score, hiscore, matches = 0, reuseport = 0;
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u32 phash = 0;
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rcu_read_lock();
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begin:
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result = NULL;
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hiscore = 0;
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sk_nulls_for_each_rcu(sk, node, &ilb->head) {
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score = compute_score(sk, net, hnum, daddr, dif);
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if (score > hiscore) {
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result = sk;
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hiscore = score;
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reuseport = sk->sk_reuseport;
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if (reuseport) {
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phash = inet_ehashfn(net, daddr, hnum,
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saddr, sport);
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matches = 1;
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}
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} else if (score == hiscore && reuseport) {
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matches++;
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if (reciprocal_scale(phash, matches) == 0)
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result = sk;
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phash = next_pseudo_random32(phash);
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}
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}
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/*
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* if the nulls value we got at the end of this lookup is
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* not the expected one, we must restart lookup.
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* We probably met an item that was moved to another chain.
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*/
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if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE)
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goto begin;
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if (result) {
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if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
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result = NULL;
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else if (unlikely(compute_score(result, net, hnum, daddr,
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dif) < hiscore)) {
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sock_put(result);
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goto begin;
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}
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}
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rcu_read_unlock();
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return result;
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}
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EXPORT_SYMBOL_GPL(__inet_lookup_listener);
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/* All sockets share common refcount, but have different destructors */
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void sock_gen_put(struct sock *sk)
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{
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if (!atomic_dec_and_test(&sk->sk_refcnt))
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return;
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if (sk->sk_state == TCP_TIME_WAIT)
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inet_twsk_free(inet_twsk(sk));
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else if (sk->sk_state == TCP_NEW_SYN_RECV)
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reqsk_free(inet_reqsk(sk));
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else
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sk_free(sk);
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}
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EXPORT_SYMBOL_GPL(sock_gen_put);
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void sock_edemux(struct sk_buff *skb)
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{
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sock_gen_put(skb->sk);
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}
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EXPORT_SYMBOL(sock_edemux);
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struct sock *__inet_lookup_established(struct net *net,
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struct inet_hashinfo *hashinfo,
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const __be32 saddr, const __be16 sport,
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const __be32 daddr, const u16 hnum,
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const int dif)
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{
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INET_ADDR_COOKIE(acookie, saddr, daddr);
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const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
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struct sock *sk;
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const struct hlist_nulls_node *node;
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/* Optimize here for direct hit, only listening connections can
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* have wildcards anyways.
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*/
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unsigned int hash = inet_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();
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begin:
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sk_nulls_for_each_rcu(sk, node, &head->chain) {
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if (sk->sk_hash != hash)
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continue;
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if (likely(INET_MATCH(sk, net, acookie,
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saddr, daddr, ports, dif))) {
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if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt)))
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goto out;
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if (unlikely(!INET_MATCH(sk, net, acookie,
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saddr, daddr, ports, dif))) {
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sock_gen_put(sk);
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goto begin;
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}
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goto found;
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}
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}
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/*
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* if the nulls value we got at the end of this lookup is
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* not the expected one, we must restart lookup.
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* We probably met an item that was moved to another chain.
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*/
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if (get_nulls_value(node) != slot)
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goto begin;
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out:
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sk = NULL;
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found:
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rcu_read_unlock();
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return sk;
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}
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EXPORT_SYMBOL_GPL(__inet_lookup_established);
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/* called with local bh disabled */
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static int __inet_check_established(struct inet_timewait_death_row *death_row,
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struct sock *sk, __u16 lport,
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struct inet_timewait_sock **twp)
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{
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struct inet_hashinfo *hinfo = death_row->hashinfo;
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struct inet_sock *inet = inet_sk(sk);
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__be32 daddr = inet->inet_rcv_saddr;
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__be32 saddr = inet->inet_daddr;
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int dif = sk->sk_bound_dev_if;
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INET_ADDR_COOKIE(acookie, saddr, daddr);
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const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
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struct net *net = sock_net(sk);
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unsigned int hash = inet_ehashfn(net, daddr, lport,
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saddr, 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 = NULL;
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int twrefcnt = 0;
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spin_lock(lock);
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sk_nulls_for_each(sk2, node, &head->chain) {
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if (sk2->sk_hash != hash)
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continue;
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if (likely(INET_MATCH(sk2, net, acookie,
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saddr, daddr, ports, dif))) {
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if (sk2->sk_state == TCP_TIME_WAIT) {
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tw = inet_twsk(sk2);
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if (twsk_unique(sk, sk2, twp))
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break;
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}
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goto not_unique;
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}
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}
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/* Must record num and sport now. Otherwise we will see
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* in hash table socket with a funny identity.
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*/
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inet->inet_num = lport;
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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) {
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twrefcnt = inet_twsk_unhash(tw);
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NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
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}
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spin_unlock(lock);
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if (twrefcnt)
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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... */
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inet_twsk_deschedule(tw);
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inet_twsk_put(tw);
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}
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return 0;
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not_unique:
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spin_unlock(lock);
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return -EADDRNOTAVAIL;
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}
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static u32 inet_sk_port_offset(const struct sock *sk)
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{
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const struct inet_sock *inet = inet_sk(sk);
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return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
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inet->inet_daddr,
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inet->inet_dport);
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}
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int __inet_hash_nolisten(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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struct hlist_nulls_head *list;
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struct inet_ehash_bucket *head;
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spinlock_t *lock;
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int twrefcnt = 0;
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WARN_ON(!sk_unhashed(sk));
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sk->sk_hash = sk_ehashfn(sk);
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head = inet_ehash_bucket(hashinfo, sk->sk_hash);
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list = &head->chain;
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lock = inet_ehash_lockp(hashinfo, sk->sk_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) {
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WARN_ON(sk->sk_hash != tw->tw_hash);
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twrefcnt = inet_twsk_unhash(tw);
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}
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spin_unlock(lock);
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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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}
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EXPORT_SYMBOL_GPL(__inet_hash_nolisten);
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int __inet_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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struct inet_listen_hashbucket *ilb;
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if (sk->sk_state != TCP_LISTEN)
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return __inet_hash_nolisten(sk, tw);
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WARN_ON(!sk_unhashed(sk));
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ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
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spin_lock(&ilb->lock);
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__sk_nulls_add_node_rcu(sk, &ilb->head);
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
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spin_unlock(&ilb->lock);
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return 0;
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}
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EXPORT_SYMBOL(__inet_hash);
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void inet_hash(struct sock *sk)
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{
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if (sk->sk_state != TCP_CLOSE) {
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local_bh_disable();
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__inet_hash(sk, NULL);
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local_bh_enable();
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}
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}
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EXPORT_SYMBOL_GPL(inet_hash);
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void inet_unhash(struct sock *sk)
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{
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struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
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spinlock_t *lock;
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int done;
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if (sk_unhashed(sk))
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return;
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if (sk->sk_state == TCP_LISTEN)
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lock = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)].lock;
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else
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lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
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spin_lock_bh(lock);
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done = __sk_nulls_del_node_init_rcu(sk);
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if (done)
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
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spin_unlock_bh(lock);
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}
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EXPORT_SYMBOL_GPL(inet_unhash);
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int __inet_hash_connect(struct inet_timewait_death_row *death_row,
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struct sock *sk, u32 port_offset,
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int (*check_established)(struct inet_timewait_death_row *,
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struct sock *, __u16, struct inet_timewait_sock **))
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{
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struct inet_hashinfo *hinfo = death_row->hashinfo;
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const unsigned short snum = inet_sk(sk)->inet_num;
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struct inet_bind_hashbucket *head;
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struct inet_bind_bucket *tb;
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int ret;
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struct net *net = sock_net(sk);
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int twrefcnt = 1;
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if (!snum) {
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int i, remaining, low, high, port;
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static u32 hint;
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u32 offset = hint + port_offset;
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struct inet_timewait_sock *tw = NULL;
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inet_get_local_port_range(net, &low, &high);
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remaining = (high - low) + 1;
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/* By starting with offset being an even number,
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* we tend to leave about 50% of ports for other uses,
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* like bind(0).
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*/
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offset &= ~1;
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local_bh_disable();
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for (i = 0; i < remaining; i++) {
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port = low + (i + offset) % remaining;
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if (inet_is_local_reserved_port(net, port))
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continue;
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head = &hinfo->bhash[inet_bhashfn(net, port,
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hinfo->bhash_size)];
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spin_lock(&head->lock);
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/* Does not bother with rcv_saddr checks,
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* because the established check is already
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* unique enough.
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*/
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inet_bind_bucket_for_each(tb, &head->chain) {
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if (net_eq(ib_net(tb), net) &&
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tb->port == port) {
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if (tb->fastreuse >= 0 ||
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tb->fastreuseport >= 0)
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goto next_port;
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WARN_ON(hlist_empty(&tb->owners));
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if (!check_established(death_row, sk,
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port, &tw))
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goto ok;
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goto next_port;
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}
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}
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tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
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net, head, port);
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if (!tb) {
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spin_unlock(&head->lock);
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break;
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}
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tb->fastreuse = -1;
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tb->fastreuseport = -1;
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goto ok;
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next_port:
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spin_unlock(&head->lock);
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}
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local_bh_enable();
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return -EADDRNOTAVAIL;
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ok:
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hint += (i + 2) & ~1;
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/* Head lock still held and bh's disabled */
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inet_bind_hash(sk, tb, port);
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if (sk_unhashed(sk)) {
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inet_sk(sk)->inet_sport = htons(port);
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twrefcnt += __inet_hash_nolisten(sk, tw);
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}
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if (tw)
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twrefcnt += inet_twsk_bind_unhash(tw, hinfo);
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spin_unlock(&head->lock);
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if (tw) {
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inet_twsk_deschedule(tw);
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while (twrefcnt) {
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twrefcnt--;
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inet_twsk_put(tw);
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}
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}
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ret = 0;
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goto out;
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}
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head = &hinfo->bhash[inet_bhashfn(net, snum, hinfo->bhash_size)];
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tb = inet_csk(sk)->icsk_bind_hash;
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spin_lock_bh(&head->lock);
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if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
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__inet_hash_nolisten(sk, NULL);
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spin_unlock_bh(&head->lock);
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return 0;
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} else {
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spin_unlock(&head->lock);
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/* No definite answer... Walk to established hash table */
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ret = check_established(death_row, sk, snum, NULL);
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out:
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local_bh_enable();
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return ret;
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}
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}
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/*
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* Bind a port for a connect operation and hash it.
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*/
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int inet_hash_connect(struct inet_timewait_death_row *death_row,
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struct sock *sk)
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{
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u32 port_offset = 0;
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if (!inet_sk(sk)->inet_num)
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port_offset = inet_sk_port_offset(sk);
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return __inet_hash_connect(death_row, sk, port_offset,
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__inet_check_established);
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}
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EXPORT_SYMBOL_GPL(inet_hash_connect);
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void inet_hashinfo_init(struct inet_hashinfo *h)
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{
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int i;
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for (i = 0; i < INET_LHTABLE_SIZE; i++) {
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spin_lock_init(&h->listening_hash[i].lock);
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INIT_HLIST_NULLS_HEAD(&h->listening_hash[i].head,
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i + LISTENING_NULLS_BASE);
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}
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}
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EXPORT_SYMBOL_GPL(inet_hashinfo_init);
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int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
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{
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unsigned int i, nblocks = 1;
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if (sizeof(spinlock_t) != 0) {
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/* allocate 2 cache lines or at least one spinlock per cpu */
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nblocks = max_t(unsigned int,
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2 * L1_CACHE_BYTES / sizeof(spinlock_t),
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1);
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nblocks = roundup_pow_of_two(nblocks * num_possible_cpus());
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/* no more locks than number of hash buckets */
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nblocks = min(nblocks, hashinfo->ehash_mask + 1);
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hashinfo->ehash_locks = kmalloc_array(nblocks, sizeof(spinlock_t),
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GFP_KERNEL | __GFP_NOWARN);
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if (!hashinfo->ehash_locks)
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hashinfo->ehash_locks = vmalloc(nblocks * sizeof(spinlock_t));
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if (!hashinfo->ehash_locks)
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return -ENOMEM;
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for (i = 0; i < nblocks; i++)
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spin_lock_init(&hashinfo->ehash_locks[i]);
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}
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hashinfo->ehash_locks_mask = nblocks - 1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);
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