639 lines
17 KiB
C
639 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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* Support for INET connection oriented protocols.
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*
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* Authors: See the TCP sources
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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/config.h>
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#include <linux/module.h>
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#include <linux/jhash.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/inet_timewait_sock.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/tcp_states.h>
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#include <net/xfrm.h>
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#ifdef INET_CSK_DEBUG
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const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n";
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EXPORT_SYMBOL(inet_csk_timer_bug_msg);
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#endif
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/*
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* This array holds the first and last local port number.
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* For high-usage systems, use sysctl to change this to
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* 32768-61000
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*/
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int sysctl_local_port_range[2] = { 1024, 4999 };
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int inet_csk_bind_conflict(const struct sock *sk,
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const struct inet_bind_bucket *tb)
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{
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const u32 sk_rcv_saddr = inet_rcv_saddr(sk);
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struct sock *sk2;
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struct hlist_node *node;
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int reuse = sk->sk_reuse;
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sk_for_each_bound(sk2, node, &tb->owners) {
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if (sk != sk2 &&
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!inet_v6_ipv6only(sk2) &&
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(!sk->sk_bound_dev_if ||
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!sk2->sk_bound_dev_if ||
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sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
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if (!reuse || !sk2->sk_reuse ||
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sk2->sk_state == TCP_LISTEN) {
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const u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
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if (!sk2_rcv_saddr || !sk_rcv_saddr ||
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sk2_rcv_saddr == sk_rcv_saddr)
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break;
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}
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}
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}
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return node != NULL;
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}
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EXPORT_SYMBOL_GPL(inet_csk_bind_conflict);
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/* Obtain a reference to a local port for the given sock,
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* if snum is zero it means select any available local port.
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*/
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int inet_csk_get_port(struct inet_hashinfo *hashinfo,
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struct sock *sk, unsigned short snum,
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int (*bind_conflict)(const struct sock *sk,
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const struct inet_bind_bucket *tb))
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{
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struct inet_bind_hashbucket *head;
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struct hlist_node *node;
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struct inet_bind_bucket *tb;
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int ret;
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local_bh_disable();
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if (!snum) {
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int low = sysctl_local_port_range[0];
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int high = sysctl_local_port_range[1];
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int remaining = (high - low) + 1;
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int rover = net_random() % (high - low) + low;
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do {
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head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)];
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spin_lock(&head->lock);
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inet_bind_bucket_for_each(tb, node, &head->chain)
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if (tb->port == rover)
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goto next;
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break;
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next:
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spin_unlock(&head->lock);
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if (++rover > high)
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rover = low;
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} while (--remaining > 0);
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/* Exhausted local port range during search? It is not
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* possible for us to be holding one of the bind hash
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* locks if this test triggers, because if 'remaining'
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* drops to zero, we broke out of the do/while loop at
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* the top level, not from the 'break;' statement.
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*/
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ret = 1;
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if (remaining <= 0)
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goto fail;
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/* OK, here is the one we will use. HEAD is
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* non-NULL and we hold it's mutex.
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*/
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snum = rover;
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} else {
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head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)];
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spin_lock(&head->lock);
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inet_bind_bucket_for_each(tb, node, &head->chain)
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if (tb->port == snum)
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goto tb_found;
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}
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tb = NULL;
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goto tb_not_found;
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tb_found:
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if (!hlist_empty(&tb->owners)) {
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if (sk->sk_reuse > 1)
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goto success;
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if (tb->fastreuse > 0 &&
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sk->sk_reuse && sk->sk_state != TCP_LISTEN) {
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goto success;
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} else {
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ret = 1;
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if (bind_conflict(sk, tb))
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goto fail_unlock;
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}
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}
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tb_not_found:
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ret = 1;
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if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, head, snum)) == NULL)
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goto fail_unlock;
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if (hlist_empty(&tb->owners)) {
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if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
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tb->fastreuse = 1;
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else
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tb->fastreuse = 0;
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} else if (tb->fastreuse &&
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(!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
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tb->fastreuse = 0;
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success:
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if (!inet_csk(sk)->icsk_bind_hash)
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inet_bind_hash(sk, tb, snum);
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BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb);
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ret = 0;
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fail_unlock:
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spin_unlock(&head->lock);
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fail:
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local_bh_enable();
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return ret;
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}
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EXPORT_SYMBOL_GPL(inet_csk_get_port);
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/*
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* Wait for an incoming connection, avoid race conditions. This must be called
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* with the socket locked.
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*/
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static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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DEFINE_WAIT(wait);
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int err;
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/*
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* True wake-one mechanism for incoming connections: only
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* one process gets woken up, not the 'whole herd'.
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* Since we do not 'race & poll' for established sockets
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* anymore, the common case will execute the loop only once.
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*
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* Subtle issue: "add_wait_queue_exclusive()" will be added
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* after any current non-exclusive waiters, and we know that
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* it will always _stay_ after any new non-exclusive waiters
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* because all non-exclusive waiters are added at the
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* beginning of the wait-queue. As such, it's ok to "drop"
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* our exclusiveness temporarily when we get woken up without
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* having to remove and re-insert us on the wait queue.
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*/
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for (;;) {
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prepare_to_wait_exclusive(sk->sk_sleep, &wait,
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TASK_INTERRUPTIBLE);
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release_sock(sk);
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if (reqsk_queue_empty(&icsk->icsk_accept_queue))
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timeo = schedule_timeout(timeo);
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lock_sock(sk);
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err = 0;
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if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
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break;
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err = -EINVAL;
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if (sk->sk_state != TCP_LISTEN)
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break;
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err = sock_intr_errno(timeo);
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if (signal_pending(current))
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break;
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err = -EAGAIN;
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if (!timeo)
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break;
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}
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finish_wait(sk->sk_sleep, &wait);
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return err;
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}
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/*
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* This will accept the next outstanding connection.
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*/
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struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct sock *newsk;
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int error;
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lock_sock(sk);
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/* We need to make sure that this socket is listening,
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* and that it has something pending.
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*/
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error = -EINVAL;
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if (sk->sk_state != TCP_LISTEN)
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goto out_err;
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/* Find already established connection */
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if (reqsk_queue_empty(&icsk->icsk_accept_queue)) {
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long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
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/* If this is a non blocking socket don't sleep */
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error = -EAGAIN;
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if (!timeo)
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goto out_err;
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error = inet_csk_wait_for_connect(sk, timeo);
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if (error)
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goto out_err;
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}
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newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk);
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BUG_TRAP(newsk->sk_state != TCP_SYN_RECV);
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out:
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release_sock(sk);
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return newsk;
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out_err:
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newsk = NULL;
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*err = error;
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goto out;
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}
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EXPORT_SYMBOL(inet_csk_accept);
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/*
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* Using different timers for retransmit, delayed acks and probes
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* We may wish use just one timer maintaining a list of expire jiffies
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* to optimize.
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*/
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void inet_csk_init_xmit_timers(struct sock *sk,
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void (*retransmit_handler)(unsigned long),
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void (*delack_handler)(unsigned long),
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void (*keepalive_handler)(unsigned long))
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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init_timer(&icsk->icsk_retransmit_timer);
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init_timer(&icsk->icsk_delack_timer);
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init_timer(&sk->sk_timer);
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icsk->icsk_retransmit_timer.function = retransmit_handler;
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icsk->icsk_delack_timer.function = delack_handler;
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sk->sk_timer.function = keepalive_handler;
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icsk->icsk_retransmit_timer.data =
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icsk->icsk_delack_timer.data =
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sk->sk_timer.data = (unsigned long)sk;
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icsk->icsk_pending = icsk->icsk_ack.pending = 0;
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}
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EXPORT_SYMBOL(inet_csk_init_xmit_timers);
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void inet_csk_clear_xmit_timers(struct sock *sk)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;
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sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
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sk_stop_timer(sk, &icsk->icsk_delack_timer);
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sk_stop_timer(sk, &sk->sk_timer);
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}
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EXPORT_SYMBOL(inet_csk_clear_xmit_timers);
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void inet_csk_delete_keepalive_timer(struct sock *sk)
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{
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sk_stop_timer(sk, &sk->sk_timer);
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}
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EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);
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void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
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{
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sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
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}
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EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
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struct dst_entry* inet_csk_route_req(struct sock *sk,
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const struct request_sock *req)
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{
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struct rtable *rt;
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const struct inet_request_sock *ireq = inet_rsk(req);
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struct ip_options *opt = inet_rsk(req)->opt;
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struct flowi fl = { .oif = sk->sk_bound_dev_if,
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.nl_u = { .ip4_u =
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{ .daddr = ((opt && opt->srr) ?
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opt->faddr :
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ireq->rmt_addr),
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.saddr = ireq->loc_addr,
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.tos = RT_CONN_FLAGS(sk) } },
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.proto = sk->sk_protocol,
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.uli_u = { .ports =
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{ .sport = inet_sk(sk)->sport,
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.dport = ireq->rmt_port } } };
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if (ip_route_output_flow(&rt, &fl, sk, 0)) {
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IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
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return NULL;
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}
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if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) {
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ip_rt_put(rt);
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IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
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return NULL;
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}
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return &rt->u.dst;
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}
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EXPORT_SYMBOL_GPL(inet_csk_route_req);
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static inline u32 inet_synq_hash(const u32 raddr, const u16 rport,
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const u32 rnd, const u16 synq_hsize)
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{
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return jhash_2words(raddr, (u32)rport, rnd) & (synq_hsize - 1);
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}
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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#define AF_INET_FAMILY(fam) ((fam) == AF_INET)
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#else
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#define AF_INET_FAMILY(fam) 1
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#endif
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struct request_sock *inet_csk_search_req(const struct sock *sk,
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struct request_sock ***prevp,
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const __u16 rport, const __u32 raddr,
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const __u32 laddr)
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{
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const struct inet_connection_sock *icsk = inet_csk(sk);
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struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
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struct request_sock *req, **prev;
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for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd,
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lopt->nr_table_entries)];
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(req = *prev) != NULL;
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prev = &req->dl_next) {
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const struct inet_request_sock *ireq = inet_rsk(req);
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if (ireq->rmt_port == rport &&
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ireq->rmt_addr == raddr &&
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ireq->loc_addr == laddr &&
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AF_INET_FAMILY(req->rsk_ops->family)) {
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BUG_TRAP(!req->sk);
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*prevp = prev;
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break;
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}
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}
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return req;
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}
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EXPORT_SYMBOL_GPL(inet_csk_search_req);
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void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
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const unsigned timeout)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
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const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port,
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lopt->hash_rnd, lopt->nr_table_entries);
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reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
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inet_csk_reqsk_queue_added(sk, timeout);
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}
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/* Only thing we need from tcp.h */
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extern int sysctl_tcp_synack_retries;
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EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
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void inet_csk_reqsk_queue_prune(struct sock *parent,
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const unsigned long interval,
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const unsigned long timeout,
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const unsigned long max_rto)
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{
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struct inet_connection_sock *icsk = inet_csk(parent);
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struct request_sock_queue *queue = &icsk->icsk_accept_queue;
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struct listen_sock *lopt = queue->listen_opt;
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int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
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int thresh = max_retries;
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unsigned long now = jiffies;
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struct request_sock **reqp, *req;
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int i, budget;
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if (lopt == NULL || lopt->qlen == 0)
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return;
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/* Normally all the openreqs are young and become mature
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* (i.e. converted to established socket) for first timeout.
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* If synack was not acknowledged for 3 seconds, it means
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* one of the following things: synack was lost, ack was lost,
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* rtt is high or nobody planned to ack (i.e. synflood).
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* When server is a bit loaded, queue is populated with old
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* open requests, reducing effective size of queue.
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* When server is well loaded, queue size reduces to zero
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* after several minutes of work. It is not synflood,
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* it is normal operation. The solution is pruning
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* too old entries overriding normal timeout, when
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* situation becomes dangerous.
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*
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* Essentially, we reserve half of room for young
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* embrions; and abort old ones without pity, if old
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* ones are about to clog our table.
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*/
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if (lopt->qlen>>(lopt->max_qlen_log-1)) {
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int young = (lopt->qlen_young<<1);
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while (thresh > 2) {
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if (lopt->qlen < young)
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break;
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thresh--;
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young <<= 1;
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}
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}
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if (queue->rskq_defer_accept)
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max_retries = queue->rskq_defer_accept;
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budget = 2 * (lopt->nr_table_entries / (timeout / interval));
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i = lopt->clock_hand;
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do {
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reqp=&lopt->syn_table[i];
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while ((req = *reqp) != NULL) {
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if (time_after_eq(now, req->expires)) {
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if ((req->retrans < thresh ||
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(inet_rsk(req)->acked && req->retrans < max_retries))
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&& !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) {
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unsigned long timeo;
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if (req->retrans++ == 0)
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lopt->qlen_young--;
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timeo = min((timeout << req->retrans), max_rto);
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req->expires = now + timeo;
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reqp = &req->dl_next;
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continue;
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}
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/* Drop this request */
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inet_csk_reqsk_queue_unlink(parent, req, reqp);
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reqsk_queue_removed(queue, req);
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reqsk_free(req);
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continue;
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}
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reqp = &req->dl_next;
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}
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i = (i + 1) & (lopt->nr_table_entries - 1);
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} while (--budget > 0);
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lopt->clock_hand = i;
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if (lopt->qlen)
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inet_csk_reset_keepalive_timer(parent, interval);
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}
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EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune);
|
|
|
|
struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req,
|
|
const gfp_t priority)
|
|
{
|
|
struct sock *newsk = sk_clone(sk, priority);
|
|
|
|
if (newsk != NULL) {
|
|
struct inet_connection_sock *newicsk = inet_csk(newsk);
|
|
|
|
newsk->sk_state = TCP_SYN_RECV;
|
|
newicsk->icsk_bind_hash = NULL;
|
|
|
|
inet_sk(newsk)->dport = inet_rsk(req)->rmt_port;
|
|
newsk->sk_write_space = sk_stream_write_space;
|
|
|
|
newicsk->icsk_retransmits = 0;
|
|
newicsk->icsk_backoff = 0;
|
|
newicsk->icsk_probes_out = 0;
|
|
|
|
/* Deinitialize accept_queue to trap illegal accesses. */
|
|
memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
|
|
}
|
|
return newsk;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(inet_csk_clone);
|
|
|
|
/*
|
|
* At this point, there should be no process reference to this
|
|
* socket, and thus no user references at all. Therefore we
|
|
* can assume the socket waitqueue is inactive and nobody will
|
|
* try to jump onto it.
|
|
*/
|
|
void inet_csk_destroy_sock(struct sock *sk)
|
|
{
|
|
BUG_TRAP(sk->sk_state == TCP_CLOSE);
|
|
BUG_TRAP(sock_flag(sk, SOCK_DEAD));
|
|
|
|
/* It cannot be in hash table! */
|
|
BUG_TRAP(sk_unhashed(sk));
|
|
|
|
/* If it has not 0 inet_sk(sk)->num, it must be bound */
|
|
BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash);
|
|
|
|
sk->sk_prot->destroy(sk);
|
|
|
|
sk_stream_kill_queues(sk);
|
|
|
|
xfrm_sk_free_policy(sk);
|
|
|
|
sk_refcnt_debug_release(sk);
|
|
|
|
atomic_dec(sk->sk_prot->orphan_count);
|
|
sock_put(sk);
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet_csk_destroy_sock);
|
|
|
|
int inet_csk_listen_start(struct sock *sk, const int nr_table_entries)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries);
|
|
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
sk->sk_max_ack_backlog = 0;
|
|
sk->sk_ack_backlog = 0;
|
|
inet_csk_delack_init(sk);
|
|
|
|
/* There is race window here: we announce ourselves listening,
|
|
* but this transition is still not validated by get_port().
|
|
* It is OK, because this socket enters to hash table only
|
|
* after validation is complete.
|
|
*/
|
|
sk->sk_state = TCP_LISTEN;
|
|
if (!sk->sk_prot->get_port(sk, inet->num)) {
|
|
inet->sport = htons(inet->num);
|
|
|
|
sk_dst_reset(sk);
|
|
sk->sk_prot->hash(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
sk->sk_state = TCP_CLOSE;
|
|
__reqsk_queue_destroy(&icsk->icsk_accept_queue);
|
|
return -EADDRINUSE;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(inet_csk_listen_start);
|
|
|
|
/*
|
|
* This routine closes sockets which have been at least partially
|
|
* opened, but not yet accepted.
|
|
*/
|
|
void inet_csk_listen_stop(struct sock *sk)
|
|
{
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
struct request_sock *acc_req;
|
|
struct request_sock *req;
|
|
|
|
inet_csk_delete_keepalive_timer(sk);
|
|
|
|
/* make all the listen_opt local to us */
|
|
acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue);
|
|
|
|
/* Following specs, it would be better either to send FIN
|
|
* (and enter FIN-WAIT-1, it is normal close)
|
|
* or to send active reset (abort).
|
|
* Certainly, it is pretty dangerous while synflood, but it is
|
|
* bad justification for our negligence 8)
|
|
* To be honest, we are not able to make either
|
|
* of the variants now. --ANK
|
|
*/
|
|
reqsk_queue_destroy(&icsk->icsk_accept_queue);
|
|
|
|
while ((req = acc_req) != NULL) {
|
|
struct sock *child = req->sk;
|
|
|
|
acc_req = req->dl_next;
|
|
|
|
local_bh_disable();
|
|
bh_lock_sock(child);
|
|
BUG_TRAP(!sock_owned_by_user(child));
|
|
sock_hold(child);
|
|
|
|
sk->sk_prot->disconnect(child, O_NONBLOCK);
|
|
|
|
sock_orphan(child);
|
|
|
|
atomic_inc(sk->sk_prot->orphan_count);
|
|
|
|
inet_csk_destroy_sock(child);
|
|
|
|
bh_unlock_sock(child);
|
|
local_bh_enable();
|
|
sock_put(child);
|
|
|
|
sk_acceptq_removed(sk);
|
|
__reqsk_free(req);
|
|
}
|
|
BUG_TRAP(!sk->sk_ack_backlog);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(inet_csk_listen_stop);
|