Release 4.8 net/ipv4/inet_connection_sock.c

/*
 * 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.
 *
 *              Support for INET connection oriented protocols.
 *
 * Authors:     See the TCP sources
 *
 *              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.
 */

#include <linux/module.h>
#include <linux/jhash.h>

#include <net/inet_connection_sock.h>
#include <net/inet_hashtables.h>
#include <net/inet_timewait_sock.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/tcp_states.h>
#include <net/xfrm.h>
#include <net/tcp.h>
#include <net/sock_reuseport.h>

#ifdef INET_CSK_DEBUG

const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n";

EXPORT_SYMBOL(inet_csk_timer_bug_msg);
#endif



void inet_get_local_port_range(struct net *net, int *low, int *high)
{
	unsigned int seq;

	do {
		seq = read_seqbegin(&net->ipv4.ip_local_ports.lock);

		*low = net->ipv4.ip_local_ports.range[0];
		*high = net->ipv4.ip_local_ports.range[1];
	} while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq));
}
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eric w. biederman
eric w. biederman
21
25.00%
1
20.00%
eric dumazet
eric dumazet
9
10.71%
2
40.00%
americo wang
americo wang
4
4.76%
1
20.00%
Total
84
100.00%
5
100.00%


EXPORT_SYMBOL(inet_get_local_port_range);



int inet_csk_bind_conflict(const struct sock *sk,
			   const struct inet_bind_bucket *tb, bool relax)
{
	struct sock *sk2;
	int reuse = sk->sk_reuse;
	int reuseport = sk->sk_reuseport;
	kuid_t uid = sock_i_uid((struct sock *)sk);

	/*
         * Unlike other sk lookup places we do not check
         * for sk_net here, since _all_ the socks listed
         * in tb->owners list belong to the same net - the
         * one this bucket belongs to.
         */

	sk_for_each_bound(sk2, &tb->owners) {
		if (sk != sk2 &&
		    !inet_v6_ipv6only(sk2) &&
		    (!sk->sk_bound_dev_if ||
		     !sk2->sk_bound_dev_if ||
		     sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
			if ((!reuse || !sk2->sk_reuse ||
			    sk2->sk_state == TCP_LISTEN) &&
			    (!reuseport || !sk2->sk_reuseport ||
			     rcu_access_pointer(sk->sk_reuseport_cb) ||
			     (sk2->sk_state != TCP_TIME_WAIT &&
			     !uid_eq(uid, sock_i_uid(sk2))))) {

				if (!sk2->sk_rcv_saddr || !sk->sk_rcv_saddr ||
				    sk2->sk_rcv_saddr == sk->sk_rcv_saddr)
					break;
			}
			if (!relax && reuse && sk2->sk_reuse &&
			    sk2->sk_state != TCP_LISTEN) {

				if (!sk2->sk_rcv_saddr || !sk->sk_rcv_saddr ||
				    sk2->sk_rcv_saddr == sk->sk_rcv_saddr)
					break;
			}
		}
	}
	return sk2 != NULL;
}
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51
23.50%
1
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alex copot
33
15.21%
1
10.00%
eric dumazet
eric dumazet
22
10.14%
2
20.00%
craig gallek
craig gallek
7
3.23%
1
10.00%
david s. miller
david s. miller
2
0.92%
1
10.00%
sasha levin
sasha levin
1
0.46%
1
10.00%
pavel emelianov
pavel emelianov
1
0.46%
1
10.00%
Total
217
100.00%
10
100.00%


EXPORT_SYMBOL_GPL(inet_csk_bind_conflict);

/* Obtain a reference to a local port for the given sock,
 * if snum is zero it means select any available local port.
 * We try to allocate an odd port (and leave even ports for connect())
 */


int inet_csk_get_port(struct sock *sk, unsigned short snum)
{
	bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN;
	struct inet_hashinfo *hinfo = sk->sk_prot->h.hashinfo;
	int ret = 1, attempts = 5, port = snum;
	int smallest_size = -1, smallest_port;
	struct inet_bind_hashbucket *head;
	struct net *net = sock_net(sk);
	int i, low, high, attempt_half;
	struct inet_bind_bucket *tb;
	kuid_t uid = sock_i_uid(sk);
	u32 remaining, offset;

	if (port) {
have_port:
		head = &hinfo->bhash[inet_bhashfn(net, port,
						  hinfo->bhash_size)];
		spin_lock_bh(&head->lock);
		inet_bind_bucket_for_each(tb, &head->chain)
			if (net_eq(ib_net(tb), net) && tb->port == port)
				goto tb_found;

		goto tb_not_found;
	}
again:
	attempt_half = (sk->sk_reuse == SK_CAN_REUSE) ? 1 : 0;
other_half_scan:
	inet_get_local_port_range(net, &low, &high);
	high++; /* [32768, 60999] -> [32768, 61000[ */
	if (high - low < 4)
		attempt_half = 0;
	if (attempt_half) {
		int half = low + (((high - low) >> 2) << 1);

		if (attempt_half == 1)
			high = half;
		else
			low = half;
	}
	remaining = high - low;
	if (likely(remaining > 1))
		remaining &= ~1U;

	offset = prandom_u32() % remaining;
	/* __inet_hash_connect() favors ports having @low parity
         * We do the opposite to not pollute connect() users.
         */
	offset |= 1U;
	smallest_size = -1;
	smallest_port = low; /* avoid compiler warning */

other_parity_scan:
	port = low + offset;
	for (i = 0; i < remaining; i += 2, port += 2) {
		if (unlikely(port >= high))
			port -= remaining;
		if (inet_is_local_reserved_port(net, port))
			continue;
		head = &hinfo->bhash[inet_bhashfn(net, port,
						  hinfo->bhash_size)];
		spin_lock_bh(&head->lock);
		inet_bind_bucket_for_each(tb, &head->chain)
			if (net_eq(ib_net(tb), net) && tb->port == port) {
				if (((tb->fastreuse > 0 && reuse) ||
				     (tb->fastreuseport > 0 &&
				      sk->sk_reuseport &&
				      !rcu_access_pointer(sk->sk_reuseport_cb) &&
				      uid_eq(tb->fastuid, uid))) &&
				    (tb->num_owners < smallest_size || smallest_size == -1)) {
					smallest_size = tb->num_owners;
					smallest_port = port;
				}
				if (!inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, false))
					goto tb_found;
				goto next_port;
			}
		goto tb_not_found;
next_port:
		spin_unlock_bh(&head->lock);
		cond_resched();
	}

	if (smallest_size != -1) {
		port = smallest_port;
		goto have_port;
	}
	offset--;
	if (!(offset & 1))
		goto other_parity_scan;

	if (attempt_half == 1) {
		/* OK we now try the upper half of the range */
		attempt_half = 2;
		goto other_half_scan;
	}
	return ret;

tb_not_found:
	tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
				     net, head, port);
	if (!tb)
		goto fail_unlock;
tb_found:
	if (!hlist_empty(&tb->owners)) {
		if (sk->sk_reuse == SK_FORCE_REUSE)
			goto success;

		if (((tb->fastreuse > 0 && reuse) ||
		     (tb->fastreuseport > 0 &&
		      !rcu_access_pointer(sk->sk_reuseport_cb) &&
		      sk->sk_reuseport && uid_eq(tb->fastuid, uid))) &&
		    smallest_size == -1)
			goto success;
		if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, true)) {
			if ((reuse ||
			     (tb->fastreuseport > 0 &&
			      sk->sk_reuseport &&
			      !rcu_access_pointer(sk->sk_reuseport_cb) &&
			      uid_eq(tb->fastuid, uid))) &&
			    smallest_size != -1 && --attempts >= 0) {
				spin_unlock_bh(&head->lock);
				goto again;
			}
			goto fail_unlock;
		}
		if (!reuse)
			tb->fastreuse = 0;
		if (!sk->sk_reuseport || !uid_eq(tb->fastuid, uid))
			tb->fastreuseport = 0;
	} else {
		tb->fastreuse = reuse;
		if (sk->sk_reuseport) {
			tb->fastreuseport = 1;
			tb->fastuid = uid;
		} else {
			tb->fastreuseport = 0;
		}
	}
success:
	if (!inet_csk(sk)->icsk_bind_hash)
		inet_bind_hash(sk, tb, port);
	WARN_ON(inet_csk(sk)->icsk_bind_hash != tb);
	ret = 0;

fail_unlock:
	spin_unlock_bh(&head->lock);
	return ret;
}
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eric dumazet
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arnaldo carvalho de melo
202
23.41%
3
10.34%
tom herbert
tom herbert
110
12.75%
2
6.90%
evgeniy polyakov
evgeniy polyakov
88
10.20%
1
3.45%
pavel emelianov
pavel emelianov
29
3.36%
4
13.79%
craig gallek
craig gallek
24
2.78%
2
6.90%
stephen hemminger
stephen hemminger
21
2.43%
3
10.34%
flavio leitner
flavio leitner
20
2.32%
2
6.90%
americo wang
americo wang
8
0.93%
2
6.90%
octavian purdila
octavian purdila
4
0.46%
1
3.45%
alex copot
alex copot
4
0.46%
1
3.45%
hideaki yoshifuji
hideaki yoshifuji
3
0.35%
1
3.45%
eric w. biederman
eric w. biederman
2
0.23%
1
3.45%
ilpo jarvinen
ilpo jarvinen
2
0.23%
1
3.45%
aruna-hewapathirane
aruna-hewapathirane
1
0.12%
1
3.45%
anton arapov
anton arapov
1
0.12%
1
3.45%
Total
863
100.00%
29
100.00%


EXPORT_SYMBOL_GPL(inet_csk_get_port);

/*
 * Wait for an incoming connection, avoid race conditions. This must be called
 * with the socket locked.
 */


static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	DEFINE_WAIT(wait);
	int err;

	/*
         * True wake-one mechanism for incoming connections: only
         * one process gets woken up, not the 'whole herd'.
         * Since we do not 'race & poll' for established sockets
         * anymore, the common case will execute the loop only once.
         *
         * Subtle issue: "add_wait_queue_exclusive()" will be added
         * after any current non-exclusive waiters, and we know that
         * it will always _stay_ after any new non-exclusive waiters
         * because all non-exclusive waiters are added at the
         * beginning of the wait-queue. As such, it's ok to "drop"
         * our exclusiveness temporarily when we get woken up without
         * having to remove and re-insert us on the wait queue.
         */
	for (;;) {
		prepare_to_wait_exclusive(sk_sleep(sk), &wait,
					  TASK_INTERRUPTIBLE);
		release_sock(sk);
		if (reqsk_queue_empty(&icsk->icsk_accept_queue))
			timeo = schedule_timeout(timeo);
		sched_annotate_sleep();
		lock_sock(sk);
		err = 0;
		if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
			break;
		err = -EINVAL;
		if (sk->sk_state != TCP_LISTEN)
			break;
		err = sock_intr_errno(timeo);
		if (signal_pending(current))
			break;
		err = -EAGAIN;
		if (!timeo)
			break;
	}
	finish_wait(sk_sleep(sk), &wait);
	return err;
}

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3
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/*
 * This will accept the next outstanding connection.
 */


struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct request_sock_queue *queue = &icsk->icsk_accept_queue;
	struct request_sock *req;
	struct sock *newsk;
	int error;

	lock_sock(sk);

	/* We need to make sure that this socket is listening,
         * and that it has something pending.
         */
	error = -EINVAL;
	if (sk->sk_state != TCP_LISTEN)
		goto out_err;

	/* Find already established connection */
	if (reqsk_queue_empty(queue)) {
		long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);

		/* If this is a non blocking socket don't sleep */
		error = -EAGAIN;
		if (!timeo)
			goto out_err;

		error = inet_csk_wait_for_connect(sk, timeo);
		if (error)
			goto out_err;
	}
	req = reqsk_queue_remove(queue, sk);
	newsk = req->sk;

	if (sk->sk_protocol == IPPROTO_TCP &&
	    tcp_rsk(req)->tfo_listener) {
		spin_lock_bh(&queue->fastopenq.lock);
		if (tcp_rsk(req)->tfo_listener) {
			/* We are still waiting for the final ACK from 3WHS
                         * so can't free req now. Instead, we set req->sk to
                         * NULL to signify that the child socket is taken
                         * so reqsk_fastopen_remove() will free the req
                         * when 3WHS finishes (or is aborted).
                         */
			req->sk = NULL;
			req = NULL;
		}
		spin_unlock_bh(&queue->fastopenq.lock);
	}
out:
	release_sock(sk);
	if (req)
		reqsk_put(req);
	return newsk;
out_err:
	newsk = NULL;
	req = NULL;
	*err = error;
	goto out;
}
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jerry chu
76
32.07%
1
12.50%
eric dumazet
eric dumazet
18
7.59%
6
75.00%
Total
237
100.00%
8
100.00%


EXPORT_SYMBOL(inet_csk_accept);

/*
 * Using different timers for retransmit, delayed acks and probes
 * We may wish use just one timer maintaining a list of expire jiffies
 * to optimize.
 */


void inet_csk_init_xmit_timers(struct sock *sk,
			       void (*retransmit_handler)(unsigned long),
			       void (*delack_handler)(unsigned long),
			       void (*keepalive_handler)(unsigned long))
{
	struct inet_connection_sock *icsk = inet_csk(sk);

	setup_timer(&icsk->icsk_retransmit_timer, retransmit_handler,
			(unsigned long)sk);
	setup_timer(&icsk->icsk_delack_timer, delack_handler,
			(unsigned long)sk);
	setup_timer(&sk->sk_timer, keepalive_handler, (unsigned long)sk);
	icsk->icsk_pending = icsk->icsk_ack.pending = 0;
}
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pavel emelianov
22
20.00%
1
50.00%
Total
110
100.00%
2
100.00%


EXPORT_SYMBOL(inet_csk_init_xmit_timers);



void inet_csk_clear_xmit_timers(struct sock *sk)
{
	struct inet_connection_sock *icsk = inet_csk(sk);

	icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;

	sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
	sk_stop_timer(sk, &icsk->icsk_delack_timer);
	sk_stop_timer(sk, &sk->sk_timer);
}
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1
100.00%


EXPORT_SYMBOL(inet_csk_clear_xmit_timers);



void inet_csk_delete_keepalive_timer(struct sock *sk)
{
	sk_stop_timer(sk, &sk->sk_timer);
}
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100.00%


EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);



void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
{
	sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
}
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EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);



struct dst_entry *inet_csk_route_req(const struct sock *sk,
				     struct flowi4 *fl4,
				     const struct request_sock *req)
{
	const struct inet_request_sock *ireq = inet_rsk(req);
	struct net *net = read_pnet(&ireq->ireq_net);
	struct ip_options_rcu *opt = ireq->opt;
	struct rtable *rt;

	flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark,
			   RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
			   sk->sk_protocol, inet_sk_flowi_flags(sk),
			   (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr,
			   ireq->ir_loc_addr, ireq->ir_rmt_port,
			   htons(ireq->ir_num));
	security_req_classify_flow(req, flowi4_to_flowi(fl4));
	rt = ip_route_output_flow(net, fl4, sk);
	if (IS_ERR(rt))
		goto no_route;
	if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway)
		goto route_err;
	return &rt->dst;

route_err:
	ip_rt_put(rt);
no_route:
	__IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
	return NULL;
}
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1
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david s. miller
david s. miller
47
23.62%
4
20.00%
eric dumazet
eric dumazet
38
19.10%
6
30.00%
ilpo jarvinen
ilpo jarvinen
16
8.04%
1
5.00%
venkat yekkirala
venkat yekkirala
6
3.02%
2
10.00%
pavel emelianov
pavel emelianov
4
2.01%
2
10.00%
lorenzo colitti
lorenzo colitti
2
1.01%
1
5.00%
julian anastasov
julian anastasov
1
0.50%
1
5.00%
atis elsts
atis elsts
1
0.50%
1
5.00%
denis v. lunev
denis v. lunev
1
0.50%
1
5.00%
Total
199
100.00%
20
100.00%


EXPORT_SYMBOL_GPL(inet_csk_route_req);



struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
					    struct sock *newsk,
					    const struct request_sock *req)
{
	const struct inet_request_sock *ireq = inet_rsk(req);
	struct net *net = read_pnet(&ireq->ireq_net);
	struct inet_sock *newinet = inet_sk(newsk);
	struct ip_options_rcu *opt;
	struct flowi4 *fl4;
	struct rtable *rt;

	fl4 = &newinet->cork.fl.u.ip4;

	rcu_read_lock();
	opt = rcu_dereference(newinet->inet_opt);
	flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark,
			   RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
			   sk->sk_protocol, inet_sk_flowi_flags(sk),
			   (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr,
			   ireq->ir_loc_addr, ireq->ir_rmt_port,
			   htons(ireq->ir_num));
	security_req_classify_flow(req, flowi4_to_flowi(fl4));
	rt = ip_route_output_flow(net, fl4, sk);
	if (IS_ERR(rt))
		goto no_route;
	if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway)
		goto route_err;
	rcu_read_unlock();
	return &rt->dst;

route_err:
	ip_rt_put(rt);
no_route:
	rcu_read_unlock();
	__IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
	return NULL;
}
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eric dumazet
25
10.37%
4
50.00%
christoph paasch
christoph paasch
18
7.47%
1
12.50%
lorenzo colitti
lorenzo colitti
1
0.41%
1
12.50%
julian anastasov
julian anastasov
1
0.41%
1
12.50%
Total
241
100.00%
8
100.00%


EXPORT_SYMBOL_GPL(inet_csk_route_child_sock);

#if IS_ENABLED(CONFIG_IPV6)

#define AF_INET_FAMILY(fam) ((fam) == AF_INET)
#else

#define AF_INET_FAMILY(fam) true
#endif

/* Decide when to expire the request and when to resend SYN-ACK */


static inline void syn_ack_recalc(struct request_sock *req, const int thresh,
				  const int max_retries,
				  const u8 rskq_defer_accept,
				  int *expire, int *resend)
{
	if (!rskq_defer_accept) {
		*expire = req->num_timeout >= thresh;
		*resend = 1;
		return;
	}
	*expire = req->num_timeout >= thresh &&
		  (!inet_rsk(req)->acked || req->num_timeout >= max_retries);
	/*
         * Do not resend while waiting for data after ACK,
         * start to resend on end of deferring period to give
         * last chance for data or ACK to create established socket.
         */
	*resend = !inet_rsk(req)->acked ||
		  req->num_timeout >= rskq_defer_accept - 1;
}

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julian anastasov
95
95.96%
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eric dumazet
4
4.04%
1
50.00%
Total
99
100.00%
2
100.00%



int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req)
{
	int err = req->rsk_ops->rtx_syn_ack(parent, req);

	if (!err)
		req->num_retrans++;
	return err;
}
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43
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2
100.00%


EXPORT_SYMBOL(inet_rtx_syn_ack);

/* return true if req was found in the ehash table */


static bool reqsk_queue_unlink(struct request_sock_queue *queue,
			       struct request_sock *req)
{
	struct inet_hashinfo *hashinfo = req_to_sk(req)->sk_prot->h.hashinfo;
	bool found = false;

	if (sk_hashed(req_to_sk(req))) {
		spinlock_t *lock = inet_ehash_lockp(hashinfo, req->rsk_hash);

		spin_lock(lock);
		found = __sk_nulls_del_node_init_rcu(req_to_sk(req));
		spin_unlock(lock);
	}
	if (timer_pending(&req->rsk_timer) && del_timer_sync(&req->rsk_timer))
		reqsk_put(req);
	return found;
}

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100.00%



void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req)
{
	if (reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req)) {
		reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req);
		reqsk_put(req);
	}
}
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50
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1
100.00%


EXPORT_SYMBOL(inet_csk_reqsk_queue_drop);



void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req)
{
	inet_csk_reqsk_queue_drop(sk, req);
	reqsk_put(req);
}
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100.00%


EXPORT_SYMBOL(inet_csk_reqsk_queue_drop_and_put);



static void reqsk_timer_handler(unsigned long data)
{
	struct request_sock *req = (struct request_sock *)data;
	struct sock *sk_listener = req->rsk_listener;
	struct net *net = sock_net(sk_listener);
	struct inet_connection_sock *icsk = inet_csk(sk_listener);
	struct request_sock_queue *queue = &icsk->icsk_accept_queue;
	int qlen, expire = 0, resend = 0;
	int max_retries, thresh;
	u8 defer_accept;

	if (sk_state_load(sk_listener) != TCP_LISTEN)
		goto drop;

	max_retries = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_synack_retries;
	thresh = max_retries;
	/* Normally all the openreqs are young and become mature
         * (i.e. converted to established socket) for first timeout.
         * If synack was not acknowledged for 1 second, it means
         * one of the following things: synack was lost, ack was lost,
         * rtt is high or nobody planned to ack (i.e. synflood).
         * When server is a bit loaded, queue is populated with old
         * open requests, reducing effective size of queue.
         * When server is well loaded, queue size reduces to zero
         * after several minutes of work. It is not synflood,
         * it is normal operation. The solution is pruning
         * too old entries overriding normal timeout, when
         * situation becomes dangerous.
         *
         * Essentially, we reserve half of room for young
         * embrions; and abort old ones without pity, if old
         * ones are about to clog our table.
         */
	qlen = reqsk_queue_len(queue);
	if ((qlen << 1) > max(8U, sk_listener->sk_max_ack_backlog)) {
		int young = reqsk_queue_len_young(queue) << 1;

		while (thresh > 2) {
			if (qlen < young)
				break;
			thresh--;
			young <<= 1;
		}
	}
	defer_accept = READ_ONCE(queue->rskq_defer_accept);
	if (defer_accept)
		max_retries = defer_accept;
	syn_ack_recalc(req, thresh, max_retries, defer_accept,
		       &expire, &resend);
	req->rsk_ops->syn_ack_timeout(req);
	if (!expire &&
	    (!resend ||
	     !inet_rtx_syn_ack(sk_listener, req) ||
	     inet_rsk(req)->acked)) {
		unsigned long timeo;

		if (req->num_timeout++ == 0)
			atomic_dec(&queue->young);
		timeo = min(TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX);
		mod_timer(&req->rsk_timer, jiffies + timeo);
		return;
	}
drop:
	inet_csk_reqsk_queue_drop_and_put(sk_listener, req);
}

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eric dumazet
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10
58.82%
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arnaldo carvalho de melo
107
36.39%
2
11.76%
julian anastasov
julian anastasov
27
9.18%
1
5.88%
nikolay borisov
nikolay borisov
14
4.76%
1
5.88%
octavian purdila
octavian purdila
11
3.74%
1
5.88%
david s. miller
david s. miller
10
3.40%
1
5.88%
thomas gleixner
thomas gleixner
1
0.34%
1
5.88%
Total
294
100.00%
17
100.00%



static void reqsk_queue_hash_req(struct request_sock *req,
				 unsigned long timeout)
{
	req->num_retrans = 0;
	req->num_timeout = 0;
	req->sk = NULL;

	setup_pinned_timer(&req->rsk_timer, reqsk_timer_handler,
			    (unsigned long)req);
	mod_timer(&req->rsk_timer, jiffies + timeout);

	inet_ehash_insert(req_to_sk(req), NULL);
	/* before letting lookups find us, make sure all req fields
         * are committed to memory and refcnt initialized.
         */
	smp_wmb();
	atomic_set(&req->rsk_refcnt, 2 + 1);
}

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eric dumazet
eric dumazet
78
89.66%
5
71.43%
arnaldo carvalho de melo
arnaldo carvalho de melo
7
8.05%
1
14.29%
thomas gleixner
thomas gleixner
2
2.30%
1
14.29%
Total
87
100.00%
7
100.00%



void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
				   unsigned long timeout)
{
	reqsk_queue_hash_req(req, timeout);
	inet_csk_reqsk_queue_added(sk);
}
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eric dumazet
eric dumazet
29
93.55%
2
66.67%
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arnaldo carvalho de melo
2
6.45%
1
33.33%
Total
31
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);

/**
 *      inet_csk_clone_lock - clone an inet socket, and lock its clone
 *      @sk: the socket to clone
 *      @req: request_sock
 *      @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
 *
 *      Caller must unlock socket even in error path (bh_unlock_sock(newsk))
 */


struct sock *inet_csk_clone_lock(const struct sock *sk,
				 const struct request_sock *req,
				 const gfp_t priority)
{
	struct sock *newsk = sk_clone_lock(sk, priority);

	if (newsk) {
		struct inet_connection_sock *newicsk = inet_csk(newsk);

		newsk->sk_state = TCP_SYN_RECV;
		newicsk->icsk_bind_hash = NULL;

		inet_sk(newsk)->inet_dport = inet_rsk(req)->ir_rmt_port;
		inet_sk(newsk)->inet_num = inet_rsk(req)->ir_num;
		inet_sk(newsk)->inet_sport = htons(inet_rsk(req)->ir_num);
		newsk->sk_write_space = sk_stream_write_space;

		/* listeners have SOCK_RCU_FREE, not the children */
		sock_reset_flag(newsk, SOCK_RCU_FREE);

		newsk->sk_mark = inet_rsk(req)->ir_mark;
		atomic64_set(&newsk->sk_cookie,
			     atomic64_read(&inet_rsk(req)->ir_cookie));

		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));

		security_inet_csk_clone(newsk, req);
	}
	return newsk;
}
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3
23.08%
eric dumazet
eric dumazet
39
19.70%
6
46.15%
kovacs krisztian
kovacs krisztian
24
12.12%
1
7.69%
lorenzo colitti
lorenzo colitti
11
5.56%
1
7.69%
venkat yekkirala
venkat yekkirala
7
3.54%
1
7.69%
al viro
al viro
1
0.51%
1
7.69%
Total
198
100.00%
13
100.00%


EXPORT_SYMBOL_GPL(inet_csk_clone_lock);

/*
 * 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)
{
	WARN_ON(sk->sk_state != TCP_CLOSE);
	WARN_ON(!sock_flag(sk, SOCK_DEAD));

	/* It cannot be in hash table! */
	WARN_ON(!sk_unhashed(sk));

	/* If it has not 0 inet_sk(sk)->inet_num, it must be bound */
	WARN_ON(inet_sk(sk)->inet_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);

	local_bh_disable();
	percpu_counter_dec(sk->sk_prot->orphan_count);
	local_bh_enable();
	sock_put(sk);
}
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ilpo jarvinen
ilpo jarvinen
9
8.74%
1
20.00%
eric dumazet
eric dumazet
9
8.74%
3
60.00%
Total
103
100.00%
5
100.00%


EXPORT_SYMBOL(inet_csk_destroy_sock);

/* This function allows to force a closure of a socket after the call to
 * tcp/dccp_create_openreq_child().
 */

void inet_csk_prepare_forced_close(struct sock *sk)
	__releases(&sk->sk_lock.slock
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11
100.00%
2
100.00%

)
{
	/* sk_clone_lock locked the socket and set refcnt to 2 */
	bh_unlock_sock(sk);
	sock_put(sk);

	/* The below has to be done to allow calling inet_csk_destroy_sock */
	sock_set_flag(sk, SOCK_DEAD);
	percpu_counter_inc(sk->sk_prot->orphan_count);
	inet_sk(sk)->inet_num = 0;
}

EXPORT_SYMBOL(inet_csk_prepare_forced_close);



int inet_csk_listen_start(struct sock *sk, int backlog)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct inet_sock *inet = inet_sk(sk);
	int err = -EADDRINUSE;

	reqsk_queue_alloc(&icsk->icsk_accept_queue);

	sk->sk_max_ack_backlog = backlog;
	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_state_store(sk, TCP_LISTEN);
	if (!sk->sk_prot->get_port(sk, inet->inet_num)) {
		inet->inet_sport = htons(inet->inet_num);

		sk_dst_reset(sk);
		err = sk->sk_prot->hash(sk);

		if (likely(!err))
			return 0;
	}

	sk->sk_state = TCP_CLOSE;
	return err;
}
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craig gallek
17
12.41%
1
16.67%
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eric dumazet
16
11.68%
4
66.67%
Total
137
100.00%
6
100.00%


EXPORT_SYMBOL_GPL(inet_csk_listen_start);



static void inet_child_forget(struct sock *sk, struct request_sock *req,
			      struct sock *child)
{
	sk->sk_prot->disconnect(child, O_NONBLOCK);

	sock_orphan(child);

	percpu_counter_inc(sk->sk_prot->orphan_count);

	if (sk->sk_protocol == IPPROTO_TCP && tcp_rsk(req)->tfo_listener) {
		BUG_ON(tcp_sk(child)->fastopen_rsk != req);
		BUG_ON(sk != req->rsk_listener);

		/* Paranoid, to prevent race condition if
                 * an inbound pkt destined for child is
                 * blocked by sock lock in tcp_v4_rcv().
                 * Also to satisfy an assertion in
                 * tcp_v4_destroy_sock().
                 */
		tcp_sk(child)->fastopen_rsk = NULL;
	}
	inet_csk_destroy_sock(child);
	reqsk_put(req);
}

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100.00%



struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
				      struct request_sock *req,
				      struct sock *child)
{
	struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue;

	spin_lock(&queue->rskq_lock);
	if (unlikely(sk->sk_state != TCP_LISTEN)) {
		inet_child_forget(sk, req, child);
		child = NULL;
	} else {
		req->sk = child;
		req->dl_next = NULL;
		if (queue->rskq_accept_head == NULL)
			queue->rskq_accept_head = req;
		else
			queue->rskq_accept_tail->dl_next = req;
		queue->rskq_accept_tail = req;
		sk_acceptq_added(sk);
	}
	spin_unlock(&queue->rskq_lock);
	return child;
}
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129
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100.00%


EXPORT_SYMBOL(inet_csk_reqsk_queue_add);



struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
					 struct request_sock *req, bool own_req)
{
	if (own_req) {
		inet_csk_reqsk_queue_drop(sk, req);
		reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req);
		if (inet_csk_reqsk_queue_add(sk, req, child))
			return child;
	}
	/* Too bad, another child took ownership of the request, undo. */
	bh_unlock_sock(child);
	sock_put(child);
	return NULL;
}
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100.00%
2
100.00%


EXPORT_SYMBOL(inet_csk_complete_hashdance);

/*
 *      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_queue *queue = &icsk->icsk_accept_queue;
	struct request_sock *next, *req;

	/* 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
         */
	while ((req = reqsk_queue_remove(queue, sk)) != NULL) {
		struct sock *child = req->sk;

		local_bh_disable();
		bh_lock_sock(child);
		WARN_ON(sock_owned_by_user(child));
		sock_hold(child);

		inet_child_forget(sk, req, child);
		bh_unlock_sock(child);
		local_bh_enable();
		sock_put(child);

		cond_resched();
	}
	if (queue->fastopenq.rskq_rst_head) {
		/* Free all the reqs queued in rskq_rst_head. */
		spin_lock_bh(&queue->fastopenq.lock);
		req = queue->fastopenq.rskq_rst_head;
		queue->fastopenq.rskq_rst_head = NULL;
		spin_unlock_bh(&queue->fastopenq.lock);
		while (req != NULL) {
			next = req->dl_next;
			reqsk_put(req);
			req = next;
		}
	}
	WARN_ON_ONCE(sk->sk_ack_backlog);
}
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1
12.50%
jerry chu
jerry chu
69
36.70%
1
12.50%
eric dumazet
eric dumazet
28
14.89%
5
62.50%
ilpo jarvinen
ilpo jarvinen
1
0.53%
1
12.50%
Total
188
100.00%
8
100.00%


EXPORT_SYMBOL_GPL(inet_csk_listen_stop);



void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
{
	struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
	const struct inet_sock *inet = inet_sk(sk);

	sin->sin_family		= AF_INET;
	sin->sin_addr.s_addr	= inet->inet_daddr;
	sin->sin_port		= inet->inet_dport;
}
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60
96.77%
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50.00%
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eric dumazet
2
3.23%
1
50.00%
Total
62
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr);

#ifdef CONFIG_COMPAT


int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
			       char __user *optval, int __user *optlen)
{
	const struct inet_connection_sock *icsk = inet_csk(sk);

	if (icsk->icsk_af_ops->compat_getsockopt)
		return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname,
							    optval, optlen);
	return icsk->icsk_af_ops->getsockopt(sk, level, optname,
					     optval, optlen);
}
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arnaldo carvalho de melo
80
98.77%
1
50.00%
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david s. miller
1
1.23%
1
50.00%
Total
81
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt);



int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
			       char __user *optval, unsigned int optlen)
{
	const struct inet_connection_sock *icsk = inet_csk(sk);

	if (icsk->icsk_af_ops->compat_setsockopt)
		return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname,
							    optval, optlen);
	return icsk->icsk_af_ops->setsockopt(sk, level, optname,
					     optval, optlen);
}
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arnaldo carvalho de melo
78
97.50%
1
33.33%
david s. miller
david s. miller
2
2.50%
2
66.67%
Total
80
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt);
#endif



static struct dst_entry *inet_csk_rebuild_route(struct sock *sk, struct flowi *fl)
{
	const struct inet_sock *inet = inet_sk(sk);
	const struct ip_options_rcu *inet_opt;
	__be32 daddr = inet->inet_daddr;
	struct flowi4 *fl4;
	struct rtable *rt;

	rcu_read_lock();
	inet_opt = rcu_dereference(inet->inet_opt);
	if (inet_opt && inet_opt->opt.srr)
		daddr = inet_opt->opt.faddr;
	fl4 = &fl->u.ip4;
	rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr,
				   inet->inet_saddr, inet->inet_dport,
				   inet->inet_sport, sk->sk_protocol,
				   RT_CONN_FLAGS(sk), sk->sk_bound_dev_if);
	if (IS_ERR(rt))
		rt = NULL;
	if (rt)
		sk_setup_caps(sk, &rt->dst);
	rcu_read_unlock();

	return &rt->dst;
}

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2
1.20%
1
50.00%
Total
166
100.00%
2
100.00%



struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu)
{
	struct dst_entry *dst = __sk_dst_check(sk, 0);
	struct inet_sock *inet = inet_sk(sk);

	if (!dst) {
		dst = inet_csk_rebuild_route(sk, &inet->cork.fl);
		if (!dst)
			goto out;
	}
	dst->ops->update_pmtu(dst, sk, NULL, mtu);

	dst = __sk_dst_check(sk, 0);
	if (!dst)
		dst = inet_csk_rebuild_route(sk, &inet->cork.fl);
out:
	return dst;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
david s. miller
david s. miller
114
100.00%
2
100.00%
Total
114
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(inet_csk_update_pmtu);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
arnaldo carvalho de melo
arnaldo carvalho de melo
1758
37.68%
8
6.61%
eric dumazet
eric dumazet
1372
29.40%
54
44.63%
david s. miller
david s. miller
546
11.70%
11
9.09%
tom herbert
tom herbert
161
3.45%
2
1.65%
jerry chu
jerry chu
145
3.11%
1
0.83%
julian anastasov
julian anastasov
125
2.68%
2
1.65%
evgeniy polyakov
evgeniy polyakov
88
1.89%
1
0.83%
stephen hemminger
stephen hemminger
76
1.63%
3
2.48%
christoph paasch
christoph paasch
75
1.61%
3
2.48%
pavel emelianov
pavel emelianov
56
1.20%
8
6.61%
craig gallek
craig gallek
51
1.09%
3
2.48%
alex copot
alex copot
37
0.79%
1
0.83%
ilpo jarvinen
ilpo jarvinen
28
0.60%
2
1.65%
kovacs krisztian
kovacs krisztian
24
0.51%
1
0.83%
eric w. biederman
eric w. biederman
23
0.49%
1
0.83%
flavio leitner
flavio leitner
20
0.43%
2
1.65%
octavian purdila
octavian purdila
15
0.32%
2
1.65%
nikolay borisov
nikolay borisov
14
0.30%
1
0.83%
lorenzo colitti
lorenzo colitti
14
0.30%
1
0.83%
venkat yekkirala
venkat yekkirala
13
0.28%
2
1.65%
americo wang
americo wang
12
0.26%
3
2.48%
hideaki yoshifuji
hideaki yoshifuji
4
0.09%
2
1.65%
thomas gleixner
thomas gleixner
3
0.06%
1
0.83%
sasha levin
sasha levin
1
0.02%
1
0.83%
denis v. lunev
denis v. lunev
1
0.02%
1
0.83%
anton arapov
anton arapov
1
0.02%
1
0.83%
aruna-hewapathirane
aruna-hewapathirane
1
0.02%
1
0.83%
atis elsts
atis elsts
1
0.02%
1
0.83%
al viro
al viro
1
0.02%
1
0.83%
Total
4666
100.00%
121
100.00%
  
Directory: net/ipv4

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