[linux-2.6-block.git] / net / rds / af_rds.c

/*
 * Copyright (c) 2006 Oracle.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/in.h>
#include <linux/poll.h>
#include <net/sock.h>

#include "rds.h"

char *rds_str_array(char **array, size_t elements, size_t index)
{
	if ((index < elements) && array[index])
		return array[index];
	else
		return "unknown";
}
EXPORT_SYMBOL(rds_str_array);

/* this is just used for stats gathering :/ */
static DEFINE_SPINLOCK(rds_sock_lock);
static unsigned long rds_sock_count;
static LIST_HEAD(rds_sock_list);
DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq);

/*
 * This is called as the final descriptor referencing this socket is closed.
 * We have to unbind the socket so that another socket can be bound to the
 * address it was using.
 *
 * We have to be careful about racing with the incoming path.  sock_orphan()
 * sets SOCK_DEAD and we use that as an indicator to the rx path that new
 * messages shouldn't be queued.
 */
static int rds_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	struct rds_sock *rs;

	if (!sk)
		goto out;

	rs = rds_sk_to_rs(sk);

	sock_orphan(sk);
	/* Note - rds_clear_recv_queue grabs rs_recv_lock, so
	 * that ensures the recv path has completed messing
	 * with the socket. */
	rds_clear_recv_queue(rs);
	rds_cong_remove_socket(rs);

	/*
	 * the binding lookup hash uses rcu, we need to
	 * make sure we synchronize_rcu before we free our
	 * entry
	 */
	rds_remove_bound(rs);
	synchronize_rcu();

	rds_send_drop_to(rs, NULL);
	rds_rdma_drop_keys(rs);
	rds_notify_queue_get(rs, NULL);

	spin_lock_bh(&rds_sock_lock);
	list_del_init(&rs->rs_item);
	rds_sock_count--;
	spin_unlock_bh(&rds_sock_lock);

	rds_trans_put(rs->rs_transport);

	sock->sk = NULL;
	sock_put(sk);
out:
	return 0;
}

/*
 * Careful not to race with rds_release -> sock_orphan which clears sk_sleep.
 * _bh() isn't OK here, we're called from interrupt handlers.  It's probably OK
 * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
 * this seems more conservative.
 * NB - normally, one would use sk_callback_lock for this, but we can
 * get here from interrupts, whereas the network code grabs sk_callback_lock
 * with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
 */
void rds_wake_sk_sleep(struct rds_sock *rs)
{
	unsigned long flags;

	read_lock_irqsave(&rs->rs_recv_lock, flags);
	__rds_wake_sk_sleep(rds_rs_to_sk(rs));
	read_unlock_irqrestore(&rs->rs_recv_lock, flags);
}

static int rds_getname(struct socket *sock, struct sockaddr *uaddr,
		       int *uaddr_len, int peer)
{
	struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
	struct rds_sock *rs = rds_sk_to_rs(sock->sk);

	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));

	/* racey, don't care */
	if (peer) {
		if (!rs->rs_conn_addr)
			return -ENOTCONN;

		sin->sin_port = rs->rs_conn_port;
		sin->sin_addr.s_addr = rs->rs_conn_addr;
	} else {
		sin->sin_port = rs->rs_bound_port;
		sin->sin_addr.s_addr = rs->rs_bound_addr;
	}

	sin->sin_family = AF_INET;

	*uaddr_len = sizeof(*sin);
	return 0;
}

/*
 * RDS' poll is without a doubt the least intuitive part of the interface,
 * as POLLIN and POLLOUT do not behave entirely as you would expect from
 * a network protocol.
 *
 * POLLIN is asserted if
 *  -	there is data on the receive queue.
 *  -	to signal that a previously congested destination may have become
 *	uncongested
 *  -	A notification has been queued to the socket (this can be a congestion
 *	update, or a RDMA completion).
 *
 * POLLOUT is asserted if there is room on the send queue. This does not mean
 * however, that the next sendmsg() call will succeed. If the application tries
 * to send to a congested destination, the system call may still fail (and
 * return ENOBUFS).
 */
static unsigned int rds_poll(struct file *file, struct socket *sock,
			     poll_table *wait)
{
	struct sock *sk = sock->sk;
	struct rds_sock *rs = rds_sk_to_rs(sk);
	unsigned int mask = 0;
	unsigned long flags;

	poll_wait(file, sk_sleep(sk), wait);

	if (rs->rs_seen_congestion)
		poll_wait(file, &rds_poll_waitq, wait);

	read_lock_irqsave(&rs->rs_recv_lock, flags);
	if (!rs->rs_cong_monitor) {
		/* When a congestion map was updated, we signal POLLIN for
		 * "historical" reasons. Applications can also poll for
		 * WRBAND instead. */
		if (rds_cong_updated_since(&rs->rs_cong_track))
			mask |= (POLLIN | POLLRDNORM | POLLWRBAND);
	} else {
		spin_lock(&rs->rs_lock);
		if (rs->rs_cong_notify)
			mask |= (POLLIN | POLLRDNORM);
		spin_unlock(&rs->rs_lock);
	}
	if (!list_empty(&rs->rs_recv_queue) ||
	    !list_empty(&rs->rs_notify_queue))
		mask |= (POLLIN | POLLRDNORM);
	if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
		mask |= (POLLOUT | POLLWRNORM);
	read_unlock_irqrestore(&rs->rs_recv_lock, flags);

	/* clear state any time we wake a seen-congested socket */
	if (mask)
		rs->rs_seen_congestion = 0;

	return mask;
}

static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	return -ENOIOCTLCMD;
}

static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval,
			      int len)
{
	struct sockaddr_in sin;
	int ret = 0;

	/* racing with another thread binding seems ok here */
	if (rs->rs_bound_addr == 0) {
		ret = -ENOTCONN; /* XXX not a great errno */
		goto out;
	}

	if (len < sizeof(struct sockaddr_in)) {
		ret = -EINVAL;
		goto out;
	}

	if (copy_from_user(&sin, optval, sizeof(sin))) {
		ret = -EFAULT;
		goto out;
	}

	rds_send_drop_to(rs, &sin);
out:
	return ret;
}

static int rds_set_bool_option(unsigned char *optvar, char __user *optval,
			       int optlen)
{
	int value;

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(value, (int __user *) optval))
		return -EFAULT;
	*optvar = !!value;
	return 0;
}

static int rds_cong_monitor(struct rds_sock *rs, char __user *optval,
			    int optlen)
{
	int ret;

	ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
	if (ret == 0) {
		if (rs->rs_cong_monitor) {
			rds_cong_add_socket(rs);
		} else {
			rds_cong_remove_socket(rs);
			rs->rs_cong_mask = 0;
			rs->rs_cong_notify = 0;
		}
	}
	return ret;
}

static int rds_setsockopt(struct socket *sock, int level, int optname,
			  char __user *optval, unsigned int optlen)
{
	struct rds_sock *rs = rds_sk_to_rs(sock->sk);
	int ret;

	if (level != SOL_RDS) {
		ret = -ENOPROTOOPT;
		goto out;
	}

	switch (optname) {
	case RDS_CANCEL_SENT_TO:
		ret = rds_cancel_sent_to(rs, optval, optlen);
		break;
	case RDS_GET_MR:
		ret = rds_get_mr(rs, optval, optlen);
		break;
	case RDS_GET_MR_FOR_DEST:
		ret = rds_get_mr_for_dest(rs, optval, optlen);
		break;
	case RDS_FREE_MR:
		ret = rds_free_mr(rs, optval, optlen);
		break;
	case RDS_RECVERR:
		ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
		break;
	case RDS_CONG_MONITOR:
		ret = rds_cong_monitor(rs, optval, optlen);
		break;
	default:
		ret = -ENOPROTOOPT;
	}
out:
	return ret;
}

static int rds_getsockopt(struct socket *sock, int level, int optname,
			  char __user *optval, int __user *optlen)
{
	struct rds_sock *rs = rds_sk_to_rs(sock->sk);
	int ret = -ENOPROTOOPT, len;

	if (level != SOL_RDS)
		goto out;

	if (get_user(len, optlen)) {
		ret = -EFAULT;
		goto out;
	}

	switch (optname) {
	case RDS_INFO_FIRST ... RDS_INFO_LAST:
		ret = rds_info_getsockopt(sock, optname, optval,
					  optlen);
		break;

	case RDS_RECVERR:
		if (len < sizeof(int))
			ret = -EINVAL;
		else
		if (put_user(rs->rs_recverr, (int __user *) optval) ||
		    put_user(sizeof(int), optlen))
			ret = -EFAULT;
		else
			ret = 0;
		break;
	default:
		break;
	}

out:
	return ret;

}

static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
		       int addr_len, int flags)
{
	struct sock *sk = sock->sk;
	struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
	struct rds_sock *rs = rds_sk_to_rs(sk);
	int ret = 0;

	lock_sock(sk);

	if (addr_len != sizeof(struct sockaddr_in)) {
		ret = -EINVAL;
		goto out;
	}

	if (sin->sin_family != AF_INET) {
		ret = -EAFNOSUPPORT;
		goto out;
	}

	if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
		ret = -EDESTADDRREQ;
		goto out;
	}

	rs->rs_conn_addr = sin->sin_addr.s_addr;
	rs->rs_conn_port = sin->sin_port;

out:
	release_sock(sk);
	return ret;
}

static struct proto rds_proto = {
	.name	  = "RDS",
	.owner	  = THIS_MODULE,
	.obj_size = sizeof(struct rds_sock),
};

static const struct proto_ops rds_proto_ops = {
	.family =	AF_RDS,
	.owner =	THIS_MODULE,
	.release =	rds_release,
	.bind =		rds_bind,
	.connect =	rds_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
	.getname =	rds_getname,
	.poll =		rds_poll,
	.ioctl =	rds_ioctl,
	.listen =	sock_no_listen,
	.shutdown =	sock_no_shutdown,
	.setsockopt =	rds_setsockopt,
	.getsockopt =	rds_getsockopt,
	.sendmsg =	rds_sendmsg,
	.recvmsg =	rds_recvmsg,
	.mmap =		sock_no_mmap,
	.sendpage =	sock_no_sendpage,
};

static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
{
	struct rds_sock *rs;

	sock_init_data(sock, sk);
	sock->ops		= &rds_proto_ops;
	sk->sk_protocol		= protocol;

	rs = rds_sk_to_rs(sk);
	spin_lock_init(&rs->rs_lock);
	rwlock_init(&rs->rs_recv_lock);
	INIT_LIST_HEAD(&rs->rs_send_queue);
	INIT_LIST_HEAD(&rs->rs_recv_queue);
	INIT_LIST_HEAD(&rs->rs_notify_queue);
	INIT_LIST_HEAD(&rs->rs_cong_list);
	spin_lock_init(&rs->rs_rdma_lock);
	rs->rs_rdma_keys = RB_ROOT;

	spin_lock_bh(&rds_sock_lock);
	list_add_tail(&rs->rs_item, &rds_sock_list);
	rds_sock_count++;
	spin_unlock_bh(&rds_sock_lock);

	return 0;
}

static int rds_create(struct net *net, struct socket *sock, int protocol,
		      int kern)
{
	struct sock *sk;

	if (sock->type != SOCK_SEQPACKET || protocol)
		return -ESOCKTNOSUPPORT;

	sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto);
	if (!sk)
		return -ENOMEM;

	return __rds_create(sock, sk, protocol);
}

void rds_sock_addref(struct rds_sock *rs)
{
	sock_hold(rds_rs_to_sk(rs));
}

void rds_sock_put(struct rds_sock *rs)
{
	sock_put(rds_rs_to_sk(rs));
}

static const struct net_proto_family rds_family_ops = {
	.family =	AF_RDS,
	.create =	rds_create,
	.owner	=	THIS_MODULE,
};

static void rds_sock_inc_info(struct socket *sock, unsigned int len,
			      struct rds_info_iterator *iter,
			      struct rds_info_lengths *lens)
{
	struct rds_sock *rs;
	struct rds_incoming *inc;
	unsigned int total = 0;

	len /= sizeof(struct rds_info_message);

	spin_lock_bh(&rds_sock_lock);

	list_for_each_entry(rs, &rds_sock_list, rs_item) {
		read_lock(&rs->rs_recv_lock);

		/* XXX too lazy to maintain counts.. */
		list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
			total++;
			if (total <= len)
				rds_inc_info_copy(inc, iter, inc->i_saddr,
						  rs->rs_bound_addr, 1);
		}

		read_unlock(&rs->rs_recv_lock);
	}

	spin_unlock_bh(&rds_sock_lock);

	lens->nr = total;
	lens->each = sizeof(struct rds_info_message);
}

static void rds_sock_info(struct socket *sock, unsigned int len,
			  struct rds_info_iterator *iter,
			  struct rds_info_lengths *lens)
{
	struct rds_info_socket sinfo;
	struct rds_sock *rs;

	len /= sizeof(struct rds_info_socket);

	spin_lock_bh(&rds_sock_lock);

	if (len < rds_sock_count)
		goto out;

	list_for_each_entry(rs, &rds_sock_list, rs_item) {
		sinfo.sndbuf = rds_sk_sndbuf(rs);
		sinfo.rcvbuf = rds_sk_rcvbuf(rs);
		sinfo.bound_addr = rs->rs_bound_addr;
		sinfo.connected_addr = rs->rs_conn_addr;
		sinfo.bound_port = rs->rs_bound_port;
		sinfo.connected_port = rs->rs_conn_port;
		sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));

		rds_info_copy(iter, &sinfo, sizeof(sinfo));
	}

out:
	lens->nr = rds_sock_count;
	lens->each = sizeof(struct rds_info_socket);

	spin_unlock_bh(&rds_sock_lock);
}

static void rds_exit(void)
{
	sock_unregister(rds_family_ops.family);
	proto_unregister(&rds_proto);
	rds_conn_exit();
	rds_cong_exit();
	rds_sysctl_exit();
	rds_threads_exit();
	rds_stats_exit();
	rds_page_exit();
	rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
	rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
}
module_exit(rds_exit);

static int rds_init(void)
{
	int ret;

	ret = rds_conn_init();
	if (ret)
		goto out;
	ret = rds_threads_init();
	if (ret)
		goto out_conn;
	ret = rds_sysctl_init();
	if (ret)
		goto out_threads;
	ret = rds_stats_init();
	if (ret)
		goto out_sysctl;
	ret = proto_register(&rds_proto, 1);
	if (ret)
		goto out_stats;
	ret = sock_register(&rds_family_ops);
	if (ret)
		goto out_proto;

	rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
	rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);

	goto out;

out_proto:
	proto_unregister(&rds_proto);
out_stats:
	rds_stats_exit();
out_sysctl:
	rds_sysctl_exit();
out_threads:
	rds_threads_exit();
out_conn:
	rds_conn_exit();
	rds_cong_exit();
	rds_page_exit();
out:
	return ret;
}
module_init(rds_init);

#define DRV_VERSION     "4.0"
#define DRV_RELDATE     "Feb 12, 2009"

MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets"
		   " v" DRV_VERSION " (" DRV_RELDATE ")");
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS_NETPROTO(PF_RDS);
Commit	Line	Data
639b321b AG	1	/*
	2	* Copyright (c) 2006 Oracle. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*
	32	*/
	33	#include <linux/module.h>
	34	#include <linux/errno.h>
	35	#include <linux/kernel.h>
5a0e3ad6	36	#include <linux/gfp.h>
639b321b AG	37	#include <linux/in.h>
639b321b AG	38	#include <linux/poll.h>
639b321b AG	39	#include <net/sock.h>
	40
	41	#include "rds.h"
639b321b	42
59f740a6 ZB	43	char rds_str_array(char *array, size_t elements, size_t index)
	44	{
	45	if ((index < elements) && array[index])
	46	return array[index];
	47	else
	48	return "unknown";
	49	}
	50	EXPORT_SYMBOL(rds_str_array);
	51
639b321b AG	52	/* this is just used for stats gathering :/ */
	53	static DEFINE_SPINLOCK(rds_sock_lock);
	54	static unsigned long rds_sock_count;
	55	static LIST_HEAD(rds_sock_list);
	56	DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq);
	57
	58	/*
	59	* This is called as the final descriptor referencing this socket is closed.
	60	* We have to unbind the socket so that another socket can be bound to the
	61	* address it was using.
	62	*
	63	* We have to be careful about racing with the incoming path. sock_orphan()
	64	* sets SOCK_DEAD and we use that as an indicator to the rx path that new
	65	* messages shouldn't be queued.
	66	*/
	67	static int rds_release(struct socket *sock)
	68	{
	69	struct sock *sk = sock->sk;
	70	struct rds_sock *rs;
639b321b	71
8690bfa1	72	if (!sk)
639b321b AG	73	goto out;
	74
	75	rs = rds_sk_to_rs(sk);
	76
	77	sock_orphan(sk);
	78	/* Note - rds_clear_recv_queue grabs rs_recv_lock, so
	79	* that ensures the recv path has completed messing
	80	* with the socket. */
	81	rds_clear_recv_queue(rs);
	82	rds_cong_remove_socket(rs);
38a4e5e6 CM	83
	84	/*
	85	* the binding lookup hash uses rcu, we need to
d7cdb968	86	* make sure we synchronize_rcu before we free our
38a4e5e6 CM	87	* entry
38a4e5e6 CM	88	*/
639b321b	89	rds_remove_bound(rs);
38a4e5e6 CM	90	synchronize_rcu();
38a4e5e6 CM	91
639b321b AG	92	rds_send_drop_to(rs, NULL);
	93	rds_rdma_drop_keys(rs);
	94	rds_notify_queue_get(rs, NULL);
	95
efc3dbc3	96	spin_lock_bh(&rds_sock_lock);
639b321b AG	97	list_del_init(&rs->rs_item);
639b321b AG	98	rds_sock_count--;
efc3dbc3	99	spin_unlock_bh(&rds_sock_lock);
639b321b	100
5adb5bc6 ZB	101	rds_trans_put(rs->rs_transport);
5adb5bc6 ZB	102
639b321b AG	103	sock->sk = NULL;
	104	sock_put(sk);
	105	out:
	106	return 0;
	107	}
	108
	109	/*
	110	* Careful not to race with rds_release -> sock_orphan which clears sk_sleep.
	111	* _bh() isn't OK here, we're called from interrupt handlers. It's probably OK
	112	* to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
	113	* this seems more conservative.
	114	* NB - normally, one would use sk_callback_lock for this, but we can
	115	* get here from interrupts, whereas the network code grabs sk_callback_lock
	116	* with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
	117	*/
	118	void rds_wake_sk_sleep(struct rds_sock *rs)
	119	{
	120	unsigned long flags;
	121
	122	read_lock_irqsave(&rs->rs_recv_lock, flags);
	123	__rds_wake_sk_sleep(rds_rs_to_sk(rs));
	124	read_unlock_irqrestore(&rs->rs_recv_lock, flags);
	125	}
	126
	127	static int rds_getname(struct socket sock, struct sockaddr uaddr,
	128	int *uaddr_len, int peer)
	129	{
	130	struct sockaddr_in sin = (struct sockaddr_in )uaddr;
	131	struct rds_sock *rs = rds_sk_to_rs(sock->sk);
	132
	133	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
	134
	135	/* racey, don't care */
	136	if (peer) {
	137	if (!rs->rs_conn_addr)
	138	return -ENOTCONN;
	139
	140	sin->sin_port = rs->rs_conn_port;
	141	sin->sin_addr.s_addr = rs->rs_conn_addr;
	142	} else {
	143	sin->sin_port = rs->rs_bound_port;
	144	sin->sin_addr.s_addr = rs->rs_bound_addr;
	145	}
	146
	147	sin->sin_family = AF_INET;
	148
	149	uaddr_len = sizeof(sin);
	150	return 0;
	151	}
	152
	153	/*
	154	* RDS' poll is without a doubt the least intuitive part of the interface,
	155	* as POLLIN and POLLOUT do not behave entirely as you would expect from
	156	* a network protocol.
	157	*
	158	* POLLIN is asserted if
	159	* - there is data on the receive queue.
	160	* - to signal that a previously congested destination may have become
	161	* uncongested
	162	* - A notification has been queued to the socket (this can be a congestion
	163	* update, or a RDMA completion).
	164	*
	165	* POLLOUT is asserted if there is room on the send queue. This does not mean
	166	* however, that the next sendmsg() call will succeed. If the application tries
167	* to send to a congested destination, the system call may still fail (and
168	* return ENOBUFS).
169	*/
170	static unsigned int rds_poll(struct file file, struct socket sock,
171	poll_table *wait)
172	{
173	struct sock *sk = sock->sk;
174	struct rds_sock *rs = rds_sk_to_rs(sk);
175	unsigned int mask = 0;
176	unsigned long flags;
177
aa395145	178	poll_wait(file, sk_sleep(sk), wait);
639b321b	179
b98ba52f AG	180	if (rs->rs_seen_congestion)
b98ba52f AG	181	poll_wait(file, &rds_poll_waitq, wait);
639b321b AG	182
	183	read_lock_irqsave(&rs->rs_recv_lock, flags);
	184	if (!rs->rs_cong_monitor) {
	185	/* When a congestion map was updated, we signal POLLIN for
	186	* "historical" reasons. Applications can also poll for
	187	* WRBAND instead. */
	188	if (rds_cong_updated_since(&rs->rs_cong_track))
	189	mask \|= (POLLIN \| POLLRDNORM \| POLLWRBAND);
	190	} else {
	191	spin_lock(&rs->rs_lock);
	192	if (rs->rs_cong_notify)
	193	mask \|= (POLLIN \| POLLRDNORM);
	194	spin_unlock(&rs->rs_lock);
	195	}
f64f9e71 JP	196	if (!list_empty(&rs->rs_recv_queue) \|\|
f64f9e71 JP	197	!list_empty(&rs->rs_notify_queue))
639b321b AG	198	mask \|= (POLLIN \| POLLRDNORM);
	199	if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
	200	mask \|= (POLLOUT \| POLLWRNORM);
	201	read_unlock_irqrestore(&rs->rs_recv_lock, flags);
	202
b98ba52f AG	203	/* clear state any time we wake a seen-congested socket */
	204	if (mask)
	205	rs->rs_seen_congestion = 0;
	206
639b321b AG	207	return mask;
	208	}
	209
	210	static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
	211	{
	212	return -ENOIOCTLCMD;
	213	}
	214
	215	static int rds_cancel_sent_to(struct rds_sock rs, char __user optval,
	216	int len)
	217	{
	218	struct sockaddr_in sin;
	219	int ret = 0;
	220
	221	/* racing with another thread binding seems ok here */
	222	if (rs->rs_bound_addr == 0) {
	223	ret = -ENOTCONN; /* XXX not a great errno */
	224	goto out;
	225	}
	226
	227	if (len < sizeof(struct sockaddr_in)) {
	228	ret = -EINVAL;
	229	goto out;
	230	}
	231
	232	if (copy_from_user(&sin, optval, sizeof(sin))) {
	233	ret = -EFAULT;
	234	goto out;
	235	}
	236
	237	rds_send_drop_to(rs, &sin);
	238	out:
	239	return ret;
	240	}
	241
	242	static int rds_set_bool_option(unsigned char optvar, char __user optval,
	243	int optlen)
	244	{
	245	int value;
	246
	247	if (optlen < sizeof(int))
	248	return -EINVAL;
	249	if (get_user(value, (int __user *) optval))
	250	return -EFAULT;
	251	*optvar = !!value;
	252	return 0;
	253	}
	254
	255	static int rds_cong_monitor(struct rds_sock rs, char __user optval,
	256	int optlen)
	257	{
	258	int ret;
	259
	260	ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
	261	if (ret == 0) {
	262	if (rs->rs_cong_monitor) {
	263	rds_cong_add_socket(rs);
	264	} else {
	265	rds_cong_remove_socket(rs);
	266	rs->rs_cong_mask = 0;
	267	rs->rs_cong_notify = 0;
	268	}
	269	}
	270	return ret;
271	}
272
273	static int rds_setsockopt(struct socket *sock, int level, int optname,
b7058842	274	char __user *optval, unsigned int optlen)
639b321b AG	275	{
	276	struct rds_sock *rs = rds_sk_to_rs(sock->sk);
	277	int ret;
	278
	279	if (level != SOL_RDS) {
	280	ret = -ENOPROTOOPT;
	281	goto out;
	282	}
	283
	284	switch (optname) {
	285	case RDS_CANCEL_SENT_TO:
	286	ret = rds_cancel_sent_to(rs, optval, optlen);
	287	break;
	288	case RDS_GET_MR:
	289	ret = rds_get_mr(rs, optval, optlen);
	290	break;
244546f0 AG	291	case RDS_GET_MR_FOR_DEST:
	292	ret = rds_get_mr_for_dest(rs, optval, optlen);
	293	break;
639b321b AG	294	case RDS_FREE_MR:
	295	ret = rds_free_mr(rs, optval, optlen);
	296	break;
	297	case RDS_RECVERR:
	298	ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
	299	break;
	300	case RDS_CONG_MONITOR:
	301	ret = rds_cong_monitor(rs, optval, optlen);
	302	break;
	303	default:
	304	ret = -ENOPROTOOPT;
	305	}
	306	out:
	307	return ret;
	308	}
	309
	310	static int rds_getsockopt(struct socket *sock, int level, int optname,
	311	char __user optval, int __user optlen)
	312	{
	313	struct rds_sock *rs = rds_sk_to_rs(sock->sk);
	314	int ret = -ENOPROTOOPT, len;
	315
	316	if (level != SOL_RDS)
	317	goto out;
	318
	319	if (get_user(len, optlen)) {
	320	ret = -EFAULT;
	321	goto out;
	322	}
	323
	324	switch (optname) {
	325	case RDS_INFO_FIRST ... RDS_INFO_LAST:
	326	ret = rds_info_getsockopt(sock, optname, optval,
	327	optlen);
	328	break;
	329
	330	case RDS_RECVERR:
	331	if (len < sizeof(int))
	332	ret = -EINVAL;
	333	else
f64f9e71 JP	334	if (put_user(rs->rs_recverr, (int __user *) optval) \|\|
f64f9e71 JP	335	put_user(sizeof(int), optlen))
639b321b AG	336	ret = -EFAULT;
	337	else
	338	ret = 0;
	339	break;
	340	default:
	341	break;
	342	}
	343
	344	out:
	345	return ret;
	346
	347	}
	348
	349	static int rds_connect(struct socket sock, struct sockaddr uaddr,
	350	int addr_len, int flags)
	351	{
	352	struct sock *sk = sock->sk;
	353	struct sockaddr_in sin = (struct sockaddr_in )uaddr;
	354	struct rds_sock *rs = rds_sk_to_rs(sk);
	355	int ret = 0;
	356
	357	lock_sock(sk);
	358
	359	if (addr_len != sizeof(struct sockaddr_in)) {
	360	ret = -EINVAL;
	361	goto out;
	362	}
	363
	364	if (sin->sin_family != AF_INET) {
	365	ret = -EAFNOSUPPORT;
	366	goto out;
	367	}
	368
	369	if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
	370	ret = -EDESTADDRREQ;
	371	goto out;
	372	}
	373
	374	rs->rs_conn_addr = sin->sin_addr.s_addr;
	375	rs->rs_conn_port = sin->sin_port;
	376
	377	out:
	378	release_sock(sk);
	379	return ret;
	380	}
	381
	382	static struct proto rds_proto = {
	383	.name = "RDS",
	384	.owner = THIS_MODULE,
	385	.obj_size = sizeof(struct rds_sock),
	386	};
	387
5708e868	388	static const struct proto_ops rds_proto_ops = {
639b321b AG	389	.family = AF_RDS,
	390	.owner = THIS_MODULE,
	391	.release = rds_release,
	392	.bind = rds_bind,
	393	.connect = rds_connect,
	394	.socketpair = sock_no_socketpair,
	395	.accept = sock_no_accept,
	396	.getname = rds_getname,
	397	.poll = rds_poll,
	398	.ioctl = rds_ioctl,
	399	.listen = sock_no_listen,
	400	.shutdown = sock_no_shutdown,
	401	.setsockopt = rds_setsockopt,
	402	.getsockopt = rds_getsockopt,
	403	.sendmsg = rds_sendmsg,
	404	.recvmsg = rds_recvmsg,
	405	.mmap = sock_no_mmap,
	406	.sendpage = sock_no_sendpage,
	407	};
	408
	409	static int __rds_create(struct socket sock, struct sock sk, int protocol)
	410	{
639b321b AG	411	struct rds_sock *rs;
	412
	413	sock_init_data(sock, sk);
	414	sock->ops = &rds_proto_ops;
	415	sk->sk_protocol = protocol;
	416
	417	rs = rds_sk_to_rs(sk);
	418	spin_lock_init(&rs->rs_lock);
	419	rwlock_init(&rs->rs_recv_lock);
	420	INIT_LIST_HEAD(&rs->rs_send_queue);
	421	INIT_LIST_HEAD(&rs->rs_recv_queue);
	422	INIT_LIST_HEAD(&rs->rs_notify_queue);
	423	INIT_LIST_HEAD(&rs->rs_cong_list);
	424	spin_lock_init(&rs->rs_rdma_lock);
	425	rs->rs_rdma_keys = RB_ROOT;
	426
efc3dbc3	427	spin_lock_bh(&rds_sock_lock);
639b321b AG	428	list_add_tail(&rs->rs_item, &rds_sock_list);
639b321b AG	429	rds_sock_count++;
efc3dbc3	430	spin_unlock_bh(&rds_sock_lock);
639b321b AG	431
	432	return 0;
	433	}
	434
3f378b68 EP	435	static int rds_create(struct net net, struct socket sock, int protocol,
3f378b68 EP	436	int kern)
639b321b AG	437	{
	438	struct sock *sk;
	439
	440	if (sock->type != SOCK_SEQPACKET \|\| protocol)
	441	return -ESOCKTNOSUPPORT;
	442
	443	sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto);
	444	if (!sk)
	445	return -ENOMEM;
	446
	447	return __rds_create(sock, sk, protocol);
	448	}
	449
	450	void rds_sock_addref(struct rds_sock *rs)
	451	{
	452	sock_hold(rds_rs_to_sk(rs));
	453	}
	454
	455	void rds_sock_put(struct rds_sock *rs)
	456	{
	457	sock_put(rds_rs_to_sk(rs));
	458	}
	459
ec1b4cf7	460	static const struct net_proto_family rds_family_ops = {
639b321b AG	461	.family = AF_RDS,
	462	.create = rds_create,
	463	.owner = THIS_MODULE,
	464	};
	465
	466	static void rds_sock_inc_info(struct socket *sock, unsigned int len,
	467	struct rds_info_iterator *iter,
	468	struct rds_info_lengths *lens)
	469	{
	470	struct rds_sock *rs;
639b321b	471	struct rds_incoming *inc;
639b321b AG	472	unsigned int total = 0;
	473
	474	len /= sizeof(struct rds_info_message);
	475
efc3dbc3	476	spin_lock_bh(&rds_sock_lock);
639b321b AG	477
639b321b AG	478	list_for_each_entry(rs, &rds_sock_list, rs_item) {
639b321b AG	479	read_lock(&rs->rs_recv_lock);
	480
	481	/* XXX too lazy to maintain counts.. */
	482	list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
	483	total++;
	484	if (total <= len)
	485	rds_inc_info_copy(inc, iter, inc->i_saddr,
	486	rs->rs_bound_addr, 1);
	487	}
	488
	489	read_unlock(&rs->rs_recv_lock);
	490	}
	491
efc3dbc3	492	spin_unlock_bh(&rds_sock_lock);
639b321b AG	493
	494	lens->nr = total;
	495	lens->each = sizeof(struct rds_info_message);
	496	}
	497
	498	static void rds_sock_info(struct socket *sock, unsigned int len,
	499	struct rds_info_iterator *iter,
	500	struct rds_info_lengths *lens)
	501	{
	502	struct rds_info_socket sinfo;
	503	struct rds_sock *rs;
639b321b AG	504
	505	len /= sizeof(struct rds_info_socket);
	506
efc3dbc3	507	spin_lock_bh(&rds_sock_lock);
639b321b AG	508
	509	if (len < rds_sock_count)
	510	goto out;
	511
	512	list_for_each_entry(rs, &rds_sock_list, rs_item) {
	513	sinfo.sndbuf = rds_sk_sndbuf(rs);
	514	sinfo.rcvbuf = rds_sk_rcvbuf(rs);
	515	sinfo.bound_addr = rs->rs_bound_addr;
	516	sinfo.connected_addr = rs->rs_conn_addr;
	517	sinfo.bound_port = rs->rs_bound_port;
	518	sinfo.connected_port = rs->rs_conn_port;
	519	sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));
	520
	521	rds_info_copy(iter, &sinfo, sizeof(sinfo));
	522	}
	523
	524	out:
	525	lens->nr = rds_sock_count;
	526	lens->each = sizeof(struct rds_info_socket);
	527
efc3dbc3	528	spin_unlock_bh(&rds_sock_lock);
639b321b AG	529	}
639b321b AG	530
ef87b7ea	531	static void rds_exit(void)
639b321b	532	{
639b321b AG	533	sock_unregister(rds_family_ops.family);
	534	proto_unregister(&rds_proto);
	535	rds_conn_exit();
	536	rds_cong_exit();
	537	rds_sysctl_exit();
	538	rds_threads_exit();
	539	rds_stats_exit();
	540	rds_page_exit();
	541	rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
	542	rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
	543	}
	544	module_exit(rds_exit);
	545
ef87b7ea	546	static int rds_init(void)
639b321b AG	547	{
	548	int ret;
	549
	550	ret = rds_conn_init();
	551	if (ret)
	552	goto out;
	553	ret = rds_threads_init();
	554	if (ret)
	555	goto out_conn;
	556	ret = rds_sysctl_init();
	557	if (ret)
	558	goto out_threads;
	559	ret = rds_stats_init();
	560	if (ret)
	561	goto out_sysctl;
	562	ret = proto_register(&rds_proto, 1);
	563	if (ret)
	564	goto out_stats;
	565	ret = sock_register(&rds_family_ops);
	566	if (ret)
	567	goto out_proto;
	568
	569	rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
	570	rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
	571
639b321b AG	572	goto out;
639b321b AG	573
639b321b AG	574	out_proto:
	575	proto_unregister(&rds_proto);
	576	out_stats:
	577	rds_stats_exit();
	578	out_sysctl:
	579	rds_sysctl_exit();
	580	out_threads:
	581	rds_threads_exit();
	582	out_conn:
	583	rds_conn_exit();
	584	rds_cong_exit();
	585	rds_page_exit();
	586	out:
	587	return ret;
	588	}
	589	module_init(rds_init);
	590
	591	#define DRV_VERSION "4.0"
	592	#define DRV_RELDATE "Feb 12, 2009"
	593
	594	MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
	595	MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets"
	596	" v" DRV_VERSION " (" DRV_RELDATE ")");
	597	MODULE_VERSION(DRV_VERSION);
	598	MODULE_LICENSE("Dual BSD/GPL");
	599	MODULE_ALIAS_NETPROTO(PF_RDS);