cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/af_inet.c

Directory: net/ipv4
/*
 * 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.
 *
 *              PF_INET protocol family socket handler.
 *
 * Authors:     Ross Biro
 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *              Florian La Roche, <flla@stud.uni-sb.de>
 *              Alan Cox, <A.Cox@swansea.ac.uk>
 *
 * Changes (see also sock.c)
 *
 *              piggy,
 *              Karl Knutson    :       Socket protocol table
 *              A.N.Kuznetsov   :       Socket death error in accept().
 *              John Richardson :       Fix non blocking error in connect()
 *                                      so sockets that fail to connect
 *                                      don't return -EINPROGRESS.
 *              Alan Cox        :       Asynchronous I/O support
 *              Alan Cox        :       Keep correct socket pointer on sock
 *                                      structures
 *                                      when accept() ed
 *              Alan Cox        :       Semantics of SO_LINGER aren't state
 *                                      moved to close when you look carefully.
 *                                      With this fixed and the accept bug fixed
 *                                      some RPC stuff seems happier.
 *              Niibe Yutaka    :       4.4BSD style write async I/O
 *              Alan Cox,
 *              Tony Gale       :       Fixed reuse semantics.
 *              Alan Cox        :       bind() shouldn't abort existing but dead
 *                                      sockets. Stops FTP netin:.. I hope.
 *              Alan Cox        :       bind() works correctly for RAW sockets.
 *                                      Note that FreeBSD at least was broken
 *                                      in this respect so be careful with
 *                                      compatibility tests...
 *              Alan Cox        :       routing cache support
 *              Alan Cox        :       memzero the socket structure for
 *                                      compactness.
 *              Matt Day        :       nonblock connect error handler
 *              Alan Cox        :       Allow large numbers of pending sockets
 *                                      (eg for big web sites), but only if
 *                                      specifically application requested.
 *              Alan Cox        :       New buffering throughout IP. Used
 *                                      dumbly.
 *              Alan Cox        :       New buffering now used smartly.
 *              Alan Cox        :       BSD rather than common sense
 *                                      interpretation of listen.
 *              Germano Caronni :       Assorted small races.
 *              Alan Cox        :       sendmsg/recvmsg basic support.
 *              Alan Cox        :       Only sendmsg/recvmsg now supported.
 *              Alan Cox        :       Locked down bind (see security list).
 *              Alan Cox        :       Loosened bind a little.
 *              Mike McLagan    :       ADD/DEL DLCI Ioctls
 *      Willy Konynenberg       :       Transparent proxying support.
 *              David S. Miller :       New socket lookup architecture.
 *                                      Some other random speedups.
 *              Cyrus Durgin    :       Cleaned up file for kmod hacks.
 *              Andi Kleen      :       Fix inet_stream_connect TCP race.
 *
 *              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.
 */


#define pr_fmt(fmt) "IPv4: " fmt

#include <linux/err.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/capability.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/netfilter_ipv4.h>
#include <linux/random.h>
#include <linux/slab.h>

#include <linux/uaccess.h>

#include <linux/inet.h>
#include <linux/igmp.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <net/checksum.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/arp.h>
#include <net/route.h>
#include <net/ip_fib.h>
#include <net/inet_connection_sock.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <net/udplite.h>
#include <net/ping.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/raw.h>
#include <net/icmp.h>
#include <net/inet_common.h>
#include <net/ip_tunnels.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/secure_seq.h>
#ifdef CONFIG_IP_MROUTE
#include <linux/mroute.h>
#endif
#include <net/l3mdev.h>


/* The inetsw table contains everything that inet_create needs to
 * build a new socket.
 */

static struct list_head inetsw[SOCK_MAX];
static DEFINE_SPINLOCK(inetsw_lock);

/* New destruction routine */




void inet_sock_destruct(struct sock *sk)
{
	struct inet_sock *inet = inet_sk(sk);

	__skb_queue_purge(&sk->sk_receive_queue);
	__skb_queue_purge(&sk->sk_error_queue);

	sk_mem_reclaim(sk);

	if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
		pr_err("Attempt to release TCP socket in state %d %p\n",
		       sk->sk_state, sk);
		return;
	}
	if (!sock_flag(sk, SOCK_DEAD)) {
		pr_err("Attempt to release alive inet socket %p\n", sk);
		return;
	}

	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
	WARN_ON(sk->sk_wmem_queued);
	WARN_ON(sk->sk_forward_alloc);

	kfree(rcu_dereference_protected(inet->inet_opt, 1));
	dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
	dst_release(sk->sk_rx_dst);
	sk_refcnt_debug_dec(sk);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)10565.22%840.00%


David S. Miller1710.56%210.00%


Arnaldo Carvalho de Melo159.32%420.00%


Eric Dumazet138.07%315.00%


Hideo Aoki53.11%15.00%


Ilpo Järvinen42.48%15.00%


James Morris21.24%15.00%


Total161100.00%20100.00%




EXPORT_SYMBOL(inet_sock_destruct);

/*
 *      The routines beyond this point handle the behaviour of an AF_INET
 *      socket object. Mostly it punts to the subprotocols of IP to do
 *      the work.
 */

/*
 *      Automatically bind an unbound socket.
 */




static int inet_autobind(struct sock *sk)
{
	struct inet_sock *inet;
	/* We may need to bind the socket. */
	lock_sock(sk);
	inet = inet_sk(sk);
	if (!inet->inet_num) {
		if (sk->sk_prot->get_port(sk, 0)) {
			release_sock(sk);
			return -EAGAIN;
		}
		inet->inet_sport = htons(inet->inet_num);
	}
	release_sock(sk);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6175.31%861.54%


Arnaldo Carvalho de Melo911.11%323.08%


David S. Miller89.88%17.69%


Eric Dumazet33.70%17.69%


Total81100.00%13100.00%



/*
 *      Move a socket into listening state.
 */



int inet_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
	unsigned char old_state;
	int err;

	lock_sock(sk);

	err = -EINVAL;
	if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
		goto out;

	old_state = sk->sk_state;
	if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
		goto out;

	/* Really, if the socket is already in listen state
         * we can only allow the backlog to be adjusted.
         */
	if (old_state != TCP_LISTEN) {
		/* Enable TFO w/o requiring TCP_FASTOPEN socket option.
                 * Note that only TCP sockets (SOCK_STREAM) will reach here.
                 * Also fastopen backlog may already been set via the option
                 * because the socket was in TCP_LISTEN state previously but
                 * was shutdown() rather than close().
                 */
		if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
		    (sysctl_tcp_fastopen & TFO_SERVER_ENABLE) &&
		    !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
			fastopen_queue_tune(sk, backlog);
			tcp_fastopen_init_key_once(true);
		}

		err = inet_csk_listen_start(sk, backlog);
		if (err)
			goto out;
	}
	sk->sk_max_ack_backlog = backlog;
	err = 0;

out:
	release_sock(sk);
	return err;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)12272.62%642.86%


Jerry Chu2514.88%17.14%


Yuchung Cheng74.17%17.14%


Christoph Paasch52.98%17.14%


Eric Dumazet42.38%214.29%


Arnaldo Carvalho de Melo42.38%214.29%


Ian Morris10.60%17.14%


Total168100.00%14100.00%




EXPORT_SYMBOL(inet_listen);

/*
 *      Create an inet socket.
 */




static int inet_create(struct net *net, struct socket *sock, int protocol,
		       int kern)
{
	struct sock *sk;
	struct inet_protosw *answer;
	struct inet_sock *inet;
	struct proto *answer_prot;
	unsigned char answer_flags;
	int try_loading_module = 0;
	int err;

	if (protocol < 0 || protocol >= IPPROTO_MAX)
		return -EINVAL;

	sock->state = SS_UNCONNECTED;

	/* Look for the requested type/protocol pair. */
lookup_protocol:
	err = -ESOCKTNOSUPPORT;
	rcu_read_lock();
	list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {

		err = 0;
		/* Check the non-wild match. */
		if (protocol == answer->protocol) {
			if (protocol != IPPROTO_IP)
				break;
		} else {
			/* Check for the two wild cases. */
			if (IPPROTO_IP == protocol) {
				protocol = answer->protocol;
				break;
			}
			if (IPPROTO_IP == answer->protocol)
				break;
		}
		err = -EPROTONOSUPPORT;
	}

	if (unlikely(err)) {
		if (try_loading_module < 2) {
			rcu_read_unlock();
			/*
                         * Be more specific, e.g. net-pf-2-proto-132-type-1
                         * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
                         */
			if (++try_loading_module == 1)
				request_module("net-pf-%d-proto-%d-type-%d",
					       PF_INET, protocol, sock->type);
			/*
                         * Fall back to generic, e.g. net-pf-2-proto-132
                         * (net-pf-PF_INET-proto-IPPROTO_SCTP)
                         */
			else
				request_module("net-pf-%d-proto-%d",
					       PF_INET, protocol);
			goto lookup_protocol;
		} else
			goto out_rcu_unlock;
	}

	err = -EPERM;
	if (sock->type == SOCK_RAW && !kern &&
	    !ns_capable(net->user_ns, CAP_NET_RAW))
		goto out_rcu_unlock;

	sock->ops = answer->ops;
	answer_prot = answer->prot;
	answer_flags = answer->flags;
	rcu_read_unlock();

	WARN_ON(!answer_prot->slab);

	err = -ENOBUFS;
	sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
	if (!sk)
		goto out;

	err = 0;
	if (INET_PROTOSW_REUSE & answer_flags)
		sk->sk_reuse = SK_CAN_REUSE;

	inet = inet_sk(sk);
	inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;

	inet->nodefrag = 0;

	if (SOCK_RAW == sock->type) {
		inet->inet_num = protocol;
		if (IPPROTO_RAW == protocol)
			inet->hdrincl = 1;
	}

	if (net->ipv4.sysctl_ip_no_pmtu_disc)
		inet->pmtudisc = IP_PMTUDISC_DONT;
	else
		inet->pmtudisc = IP_PMTUDISC_WANT;

	inet->inet_id = 0;

	sock_init_data(sock, sk);

	sk->sk_destruct	   = inet_sock_destruct;
	sk->sk_protocol	   = protocol;
	sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;

	inet->uc_ttl	= -1;
	inet->mc_loop	= 1;
	inet->mc_ttl	= 1;
	inet->mc_all	= 1;
	inet->mc_index	= 0;
	inet->mc_list	= NULL;
	inet->rcv_tos	= 0;

	sk_refcnt_debug_inc(sk);

	if (inet->inet_num) {
		/* It assumes that any protocol which allows
                 * the user to assign a number at socket
                 * creation time automatically
                 * shares.
                 */
		inet->inet_sport = htons(inet->inet_num);
		/* Add to protocol hash chains. */
		err = sk->sk_prot->hash(sk);
		if (err) {
			sk_common_release(sk);
			goto out;
		}
	}

	if (sk->sk_prot->init) {
		err = sk->sk_prot->init(sk);
		if (err) {
			sk_common_release(sk);
			goto out;
		}
	}

	if (!kern) {
		err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
		if (err) {
			sk_common_release(sk);
			goto out;
		}
	}
out:
	return err;
out_rcu_unlock:
	rcu_read_unlock();
	goto out;
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)19032.09%1428.00%


Arnaldo Carvalho de Melo14925.17%816.00%


Linus Torvalds7913.34%24.00%


David Ahern335.57%12.00%


David S. Miller274.56%36.00%


Hannes Frederic Sowa183.04%24.00%


Craig Gallek162.70%12.00%


Eric W. Biedermann142.36%36.00%


Eric Paris111.86%36.00%


Herbert Xu101.69%12.00%


Paul E. McKenney71.18%12.00%


Nivedita Singhvi61.01%12.00%


Jiri Olsa61.01%12.00%


Jiri Benc61.01%12.00%


Stephen Hemminger50.84%12.00%


Eric Dumazet50.84%12.00%


Paul Moore40.68%24.00%


Denis V. Lunev20.34%12.00%


Ian Morris20.34%12.00%


Pavel Emelyanov10.17%12.00%


Ilpo Järvinen10.17%12.00%


Total592100.00%50100.00%



/*
 *      The peer socket should always be NULL (or else). When we call this
 *      function we are destroying the object and from then on nobody
 *      should refer to it.
 */



int inet_release(struct socket *sock)
{
	struct sock *sk = sock->sk;

	if (sk) {
		long timeout;

		/* Applications forget to leave groups before exiting */
		ip_mc_drop_socket(sk);

		/* If linger is set, we don't return until the close
                 * is complete.  Otherwise we return immediately. The
                 * actually closing is done the same either way.
                 *
                 * If the close is due to the process exiting, we never
                 * linger..
                 */
		timeout = 0;
		if (sock_flag(sk, SOCK_LINGER) &&
		    !(current->flags & PF_EXITING))
			timeout = sk->sk_lingertime;
		sock->sk = NULL;
		sk->sk_prot->close(sk, timeout);
	}
	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7691.57%770.00%


Arnaldo Carvalho de Melo56.02%220.00%


James Morris22.41%110.00%


Total83100.00%10100.00%




EXPORT_SYMBOL(inet_release);




int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
	struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
	struct sock *sk = sock->sk;
	struct inet_sock *inet = inet_sk(sk);
	struct net *net = sock_net(sk);
	unsigned short snum;
	int chk_addr_ret;
	u32 tb_id = RT_TABLE_LOCAL;
	int err;

	/* If the socket has its own bind function then use it. (RAW) */
	if (sk->sk_prot->bind) {
		err = sk->sk_prot->bind(sk, uaddr, addr_len);
		goto out;
	}
	err = -EINVAL;
	if (addr_len < sizeof(struct sockaddr_in))
		goto out;

	if (addr->sin_family != AF_INET) {
		/* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
                 * only if s_addr is INADDR_ANY.
                 */
		err = -EAFNOSUPPORT;
		if (addr->sin_family != AF_UNSPEC ||
		    addr->sin_addr.s_addr != htonl(INADDR_ANY))
			goto out;
	}

	tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
	chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);

	/* Not specified by any standard per-se, however it breaks too
         * many applications when removed.  It is unfortunate since
         * allowing applications to make a non-local bind solves
         * several problems with systems using dynamic addressing.
         * (ie. your servers still start up even if your ISDN link
         *  is temporarily down)
         */
	err = -EADDRNOTAVAIL;
	if (!net->ipv4.sysctl_ip_nonlocal_bind &&
	    !(inet->freebind || inet->transparent) &&
	    addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
	    chk_addr_ret != RTN_LOCAL &&
	    chk_addr_ret != RTN_MULTICAST &&
	    chk_addr_ret != RTN_BROADCAST)
		goto out;

	snum = ntohs(addr->sin_port);
	err = -EACCES;
	if (snum && snum < inet_prot_sock(net) &&
	    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
		goto out;

	/*      We keep a pair of addresses. rcv_saddr is the one
         *      used by hash lookups, and saddr is used for transmit.
         *
         *      In the BSD API these are the same except where it
         *      would be illegal to use them (multicast/broadcast) in
         *      which case the sending device address is used.
         */
	lock_sock(sk);

	/* Check these errors (active socket, double bind). */
	err = -EINVAL;
	if (sk->sk_state != TCP_CLOSE || inet->inet_num)
		goto out_release_sock;

	inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
		inet->inet_saddr = 0;  /* Use device */

	/* Make sure we are allowed to bind here. */
	if ((snum || !inet->bind_address_no_port) &&
	    sk->sk_prot->get_port(sk, snum)) {
		inet->inet_saddr = inet->inet_rcv_saddr = 0;
		err = -EADDRINUSE;
		goto out_release_sock;
	}

	if (inet->inet_rcv_saddr)
		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
	if (snum)
		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
	inet->inet_sport = htons(inet->inet_num);
	inet->inet_daddr = 0;
	inet->inet_dport = 0;
	sk_dst_reset(sk);
	err = 0;
out_release_sock:
	release_sock(sk);
out:
	return err;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)26359.10%1745.95%


Arnaldo Carvalho de Melo4610.34%38.11%


Eric Dumazet408.99%38.11%


David Ahern235.17%410.81%


David S. Miller214.72%25.41%


Marcus Meissner184.04%25.41%


Eric W. Biedermann173.82%25.41%


Tóth László Attila61.35%12.70%


Vincent Bernat40.90%12.70%


Krister Johansen40.90%12.70%


Al Viro30.67%12.70%


Total445100.00%37100.00%




EXPORT_SYMBOL(inet_bind);




int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
		       int addr_len, int flags)
{
	struct sock *sk = sock->sk;

	if (addr_len < sizeof(uaddr->sa_family))
		return -EINVAL;
	if (uaddr->sa_family == AF_UNSPEC)
		return sk->sk_prot->disconnect(sk, flags);

	if (!inet_sk(sk)->inet_num && inet_autobind(sk))
		return -EAGAIN;
	return sk->sk_prot->connect(sk, uaddr, addr_len);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7677.55%555.56%


Changli Gao1515.31%111.11%


David S. Miller44.08%111.11%


Arnaldo Carvalho de Melo22.04%111.11%


Eric Dumazet11.02%111.11%


Total98100.00%9100.00%




EXPORT_SYMBOL(inet_dgram_connect);




static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
{
	DEFINE_WAIT_FUNC(wait, woken_wake_function);

	add_wait_queue(sk_sleep(sk), &wait);
	sk->sk_write_pending += writebias;

	/* Basic assumption: if someone sets sk->sk_err, he _must_
         * change state of the socket from TCP_SYN_*.
         * Connect() does not allow to get error notifications
         * without closing the socket.
         */
	while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
		release_sock(sk);
		timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
		lock_sock(sk);
		if (signal_pending(current) || !timeo)
			break;
	}
	remove_wait_queue(sk_sleep(sk), &wait);
	sk->sk_write_pending -= writebias;
	return timeo;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7768.14%450.00%


Yuchung Cheng1513.27%112.50%


Américo Wang119.73%112.50%


Eric Dumazet65.31%112.50%


Arnaldo Carvalho de Melo43.54%112.50%


Total113100.00%8100.00%



/*
 *      Connect to a remote host. There is regrettably still a little
 *      TCP 'magic' in here.
 */



int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
			  int addr_len, int flags, int is_sendmsg)
{
	struct sock *sk = sock->sk;
	int err;
	long timeo;

	/*
         * uaddr can be NULL and addr_len can be 0 if:
         * sk is a TCP fastopen active socket and
         * TCP_FASTOPEN_CONNECT sockopt is set and
         * we already have a valid cookie for this socket.
         * In this case, user can call write() after connect().
         * write() will invoke tcp_sendmsg_fastopen() which calls
         * __inet_stream_connect().
         */
	if (uaddr) {
		if (addr_len < sizeof(uaddr->sa_family))
			return -EINVAL;

		if (uaddr->sa_family == AF_UNSPEC) {
			err = sk->sk_prot->disconnect(sk, flags);
			sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
			goto out;
		}
	}

	switch (sock->state) {
	default:
		err = -EINVAL;
		goto out;
	case SS_CONNECTED:
		err = -EISCONN;
		goto out;
	case SS_CONNECTING:
		if (inet_sk(sk)->defer_connect)
			err = is_sendmsg ? -EINPROGRESS : -EISCONN;
		else
			err = -EALREADY;
		/* Fall out of switch with err, set for this state */
		break;
	case SS_UNCONNECTED:
		err = -EISCONN;
		if (sk->sk_state != TCP_CLOSE)
			goto out;

		err = sk->sk_prot->connect(sk, uaddr, addr_len);
		if (err < 0)
			goto out;

		sock->state = SS_CONNECTING;

		if (!err && inet_sk(sk)->defer_connect)
			goto out;

		/* Just entered SS_CONNECTING state; the only
                 * difference is that return value in non-blocking
                 * case is EINPROGRESS, rather than EALREADY.
                 */
		err = -EINPROGRESS;
		break;
	}

	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);

	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
		int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
				tcp_sk(sk)->fastopen_req &&
				tcp_sk(sk)->fastopen_req->data ? 1 : 0;

		/* Error code is set above */
		if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
			goto out;

		err = sock_intr_errno(timeo);
		if (signal_pending(current))
			goto out;
	}

	/* Connection was closed by RST, timeout, ICMP error
         * or another process disconnected us.
         */
	if (sk->sk_state == TCP_CLOSE)
		goto sock_error;

	/* sk->sk_err may be not zero now, if RECVERR was ordered by user
         * and error was received after socket entered established state.
         * Hence, it is handled normally after connect() return successfully.
         */

	sock->state = SS_CONNECTED;
	err = 0;
out:
	return err;

sock_error:
	err = sock_error(sk) ? : -ECONNABORTED;
	sock->state = SS_UNCONNECTED;
	if (sk->sk_prot->disconnect(sk, flags))
		sock->state = SS_DISCONNECTING;
	goto out;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)29074.17%1266.67%


Wei Wang379.46%15.56%


Yuchung Cheng348.70%211.11%


Changli Gao153.84%15.56%


Willy Tarreau82.05%15.56%


Arnaldo Carvalho de Melo71.79%15.56%


Total391100.00%18100.00%




EXPORT_SYMBOL(__inet_stream_connect);




int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
			int addr_len, int flags)
{
	int err;

	lock_sock(sock->sk);
	err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
	release_sock(sock->sk);
	return err;
}

Contributors
PersonTokensPropCommitsCommitProp
Yuchung Cheng5496.43%150.00%


Willy Tarreau23.57%150.00%


Total56100.00%2100.00%




EXPORT_SYMBOL(inet_stream_connect);

/*
 *      Accept a pending connection. The TCP layer now gives BSD semantics.
 */




int inet_accept(struct socket *sock, struct socket *newsock, int flags,
		bool kern)
{
	struct sock *sk1 = sock->sk;
	int err = -EINVAL;
	struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);

	if (!sk2)
		goto do_err;

	lock_sock(sk2);

	sock_rps_record_flow(sk2);
	WARN_ON(!((1 << sk2->sk_state) &
		  (TCPF_ESTABLISHED | TCPF_SYN_RECV |
		  TCPF_CLOSE_WAIT | TCPF_CLOSE)));

	sock_graft(sk2, newsock);

	newsock->state = SS_CONNECTED;
	err = 0;
	release_sock(sk2);
do_err:
	return err;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)9575.40%857.14%


Arnaldo Carvalho de Melo1511.90%214.29%


David Howells53.97%17.14%


Eric Dumazet53.97%17.14%


Ilpo Järvinen43.17%17.14%


Jerry Chu21.59%17.14%


Total126100.00%14100.00%




EXPORT_SYMBOL(inet_accept);


/*
 *      This does both peername and sockname.
 */



int inet_getname(struct socket *sock, struct sockaddr *uaddr,
			int *uaddr_len, int peer)
{
	struct sock *sk		= sock->sk;
	struct inet_sock *inet	= inet_sk(sk);
	DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);

	sin->sin_family = AF_INET;
	if (peer) {
		if (!inet->inet_dport ||
		    (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
		     peer == 1))
			return -ENOTCONN;
		sin->sin_port = inet->inet_dport;
		sin->sin_addr.s_addr = inet->inet_daddr;
	} else {
		__be32 addr = inet->inet_rcv_saddr;
		if (!addr)
			addr = inet->inet_saddr;
		sin->sin_port = inet->inet_sport;
		sin->sin_addr.s_addr = addr;
	}
	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
	*uaddr_len = sizeof(*sin);
	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)13172.78%642.86%


Alexey Kuznetsov168.89%17.14%


David S. Miller147.78%17.14%


Cyrill V. Gorcunov73.89%17.14%


Eric Dumazet63.33%17.14%


Arnaldo Carvalho de Melo52.78%321.43%


Al Viro10.56%17.14%


Total180100.00%14100.00%




EXPORT_SYMBOL(inet_getname);




int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
{
	struct sock *sk = sock->sk;

	sock_rps_record_flow(sk);

	/* We may need to bind the socket. */
	if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
	    inet_autobind(sk))
		return -EAGAIN;

	return sk->sk_prot->sendmsg(sk, msg, size);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5473.97%330.00%


Changli Gao79.59%110.00%


David S. Miller56.85%220.00%


Tom Herbert45.48%110.00%


Arnaldo Carvalho de Melo11.37%110.00%


Stephen Hemminger11.37%110.00%


Eric Dumazet11.37%110.00%


Total73100.00%10100.00%




EXPORT_SYMBOL(inet_sendmsg);




ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
		      size_t size, int flags)
{
	struct sock *sk = sock->sk;

	sock_rps_record_flow(sk);

	/* We may need to bind the socket. */
	if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
	    inet_autobind(sk))
		return -EAGAIN;

	if (sk->sk_prot->sendpage)
		return sk->sk_prot->sendpage(sk, page, offset, size, flags);
	return sock_no_sendpage(sock