[mirror_ubuntu-zesty-kernel.git] / drivers / infiniband / core / addr.c

/*
 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
 * Copyright (c) 2005 Intel Corporation.  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/mutex.h>
#include <linux/inetdevice.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <net/arp.h>
#include <net/neighbour.h>
#include <net/route.h>
#include <net/netevent.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <rdma/ib_addr.h>

MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("IB Address Translation");
MODULE_LICENSE("Dual BSD/GPL");

struct addr_req {
	struct list_head list;
	struct sockaddr_storage src_addr;
	struct sockaddr_storage dst_addr;
	struct rdma_dev_addr *addr;
	struct rdma_addr_client *client;
	void *context;
	void (*callback)(int status, struct sockaddr *src_addr,
			 struct rdma_dev_addr *addr, void *context);
	unsigned long timeout;
	int status;
};

static void process_req(struct work_struct *work);

static DEFINE_MUTEX(lock);
static LIST_HEAD(req_list);
static DECLARE_DELAYED_WORK(work, process_req);
static struct workqueue_struct *addr_wq;

void rdma_addr_register_client(struct rdma_addr_client *client)
{
	atomic_set(&client->refcount, 1);
	init_completion(&client->comp);
}
EXPORT_SYMBOL(rdma_addr_register_client);

static inline void put_client(struct rdma_addr_client *client)
{
	if (atomic_dec_and_test(&client->refcount))
		complete(&client->comp);
}

void rdma_addr_unregister_client(struct rdma_addr_client *client)
{
	put_client(client);
	wait_for_completion(&client->comp);
}
EXPORT_SYMBOL(rdma_addr_unregister_client);

int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
		     const unsigned char *dst_dev_addr)
{
	dev_addr->dev_type = dev->type;
	memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
	if (dst_dev_addr)
		memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
	dev_addr->bound_dev_if = dev->ifindex;
	return 0;
}
EXPORT_SYMBOL(rdma_copy_addr);

int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
{
	struct net_device *dev;
	int ret = -EADDRNOTAVAIL;

	if (dev_addr->bound_dev_if) {
		dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
		if (!dev)
			return -ENODEV;
		ret = rdma_copy_addr(dev_addr, dev, NULL);
		dev_put(dev);
		return ret;
	}

	switch (addr->sa_family) {
	case AF_INET:
		dev = ip_dev_find(&init_net,
			((struct sockaddr_in *) addr)->sin_addr.s_addr);

		if (!dev)
			return ret;

		ret = rdma_copy_addr(dev_addr, dev, NULL);
		dev_put(dev);
		break;

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case AF_INET6:
		rcu_read_lock();
		for_each_netdev_rcu(&init_net, dev) {
			if (ipv6_chk_addr(&init_net,
					  &((struct sockaddr_in6 *) addr)->sin6_addr,
					  dev, 1)) {
				ret = rdma_copy_addr(dev_addr, dev, NULL);
				break;
			}
		}
		rcu_read_unlock();
		break;
#endif
	}
	return ret;
}
EXPORT_SYMBOL(rdma_translate_ip);

static void set_timeout(unsigned long time)
{
	unsigned long delay;

	cancel_delayed_work(&work);

	delay = time - jiffies;
	if ((long)delay <= 0)
		delay = 1;

	queue_delayed_work(addr_wq, &work, delay);
}

static void queue_req(struct addr_req *req)
{
	struct addr_req *temp_req;

	mutex_lock(&lock);
	list_for_each_entry_reverse(temp_req, &req_list, list) {
		if (time_after_eq(req->timeout, temp_req->timeout))
			break;
	}

	list_add(&req->list, &temp_req->list);

	if (req_list.next == &req->list)
		set_timeout(req->timeout);
	mutex_unlock(&lock);
}

static int addr4_resolve(struct sockaddr_in *src_in,
			 struct sockaddr_in *dst_in,
			 struct rdma_dev_addr *addr)
{
	__be32 src_ip = src_in->sin_addr.s_addr;
	__be32 dst_ip = dst_in->sin_addr.s_addr;
	struct rtable *rt;
	struct neighbour *neigh;
	struct flowi4 fl4;
	int ret;

	memset(&fl4, 0, sizeof(fl4));
	fl4.daddr = dst_ip;
	fl4.saddr = src_ip;
	fl4.flowi4_oif = addr->bound_dev_if;
	rt = ip_route_output_key(&init_net, &fl4);
	if (IS_ERR(rt)) {
		ret = PTR_ERR(rt);
		goto out;
	}
	src_in->sin_family = AF_INET;
	src_in->sin_addr.s_addr = fl4.saddr;

	if (rt->dst.dev->flags & IFF_LOOPBACK) {
		ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
		if (!ret)
			memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
		goto put;
	}

	/* If the device does ARP internally, return 'done' */
	if (rt->dst.dev->flags & IFF_NOARP) {
		ret = rdma_copy_addr(addr, rt->dst.dev, NULL);
		goto put;
	}

	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->dst.dev);
	if (!neigh || !(neigh->nud_state & NUD_VALID)) {
		neigh_event_send(dst_get_neighbour(&rt->dst), NULL);
		ret = -ENODATA;
		if (neigh)
			goto release;
		goto put;
	}

	ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
release:
	neigh_release(neigh);
put:
	ip_rt_put(rt);
out:
	return ret;
}

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static int addr6_resolve(struct sockaddr_in6 *src_in,
			 struct sockaddr_in6 *dst_in,
			 struct rdma_dev_addr *addr)
{
	struct flowi6 fl6;
	struct neighbour *neigh;
	struct dst_entry *dst;
	int ret;

	memset(&fl6, 0, sizeof fl6);
	ipv6_addr_copy(&fl6.daddr, &dst_in->sin6_addr);
	ipv6_addr_copy(&fl6.saddr, &src_in->sin6_addr);
	fl6.flowi6_oif = addr->bound_dev_if;

	dst = ip6_route_output(&init_net, NULL, &fl6);
	if ((ret = dst->error))
		goto put;

	if (ipv6_addr_any(&fl6.saddr)) {
		ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
					 &fl6.daddr, 0, &fl6.saddr);
		if (ret)
			goto put;

		src_in->sin6_family = AF_INET6;
		ipv6_addr_copy(&src_in->sin6_addr, &fl6.saddr);
	}

	if (dst->dev->flags & IFF_LOOPBACK) {
		ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
		if (!ret)
			memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
		goto put;
	}

	/* If the device does ARP internally, return 'done' */
	if (dst->dev->flags & IFF_NOARP) {
		ret = rdma_copy_addr(addr, dst->dev, NULL);
		goto put;
	}

	neigh = dst_get_neighbour(dst);
	if (!neigh || !(neigh->nud_state & NUD_VALID)) {
		if (neigh)
			neigh_event_send(neigh, NULL);
		ret = -ENODATA;
		goto put;
	}

	ret = rdma_copy_addr(addr, dst->dev, neigh->ha);
put:
	dst_release(dst);
	return ret;
}
#else
static int addr6_resolve(struct sockaddr_in6 *src_in,
			 struct sockaddr_in6 *dst_in,
			 struct rdma_dev_addr *addr)
{
	return -EADDRNOTAVAIL;
}
#endif

static int addr_resolve(struct sockaddr *src_in,
			struct sockaddr *dst_in,
			struct rdma_dev_addr *addr)
{
	if (src_in->sa_family == AF_INET) {
		return addr4_resolve((struct sockaddr_in *) src_in,
			(struct sockaddr_in *) dst_in, addr);
	} else
		return addr6_resolve((struct sockaddr_in6 *) src_in,
			(struct sockaddr_in6 *) dst_in, addr);
}

static void process_req(struct work_struct *work)
{
	struct addr_req *req, *temp_req;
	struct sockaddr *src_in, *dst_in;
	struct list_head done_list;

	INIT_LIST_HEAD(&done_list);

	mutex_lock(&lock);
	list_for_each_entry_safe(req, temp_req, &req_list, list) {
		if (req->status == -ENODATA) {
			src_in = (struct sockaddr *) &req->src_addr;
			dst_in = (struct sockaddr *) &req->dst_addr;
			req->status = addr_resolve(src_in, dst_in, req->addr);
			if (req->status && time_after_eq(jiffies, req->timeout))
				req->status = -ETIMEDOUT;
			else if (req->status == -ENODATA)
				continue;
		}
		list_move_tail(&req->list, &done_list);
	}

	if (!list_empty(&req_list)) {
		req = list_entry(req_list.next, struct addr_req, list);
		set_timeout(req->timeout);
	}
	mutex_unlock(&lock);

	list_for_each_entry_safe(req, temp_req, &done_list, list) {
		list_del(&req->list);
		req->callback(req->status, (struct sockaddr *) &req->src_addr,
			req->addr, req->context);
		put_client(req->client);
		kfree(req);
	}
}

int rdma_resolve_ip(struct rdma_addr_client *client,
		    struct sockaddr *src_addr, struct sockaddr *dst_addr,
		    struct rdma_dev_addr *addr, int timeout_ms,
		    void (*callback)(int status, struct sockaddr *src_addr,
				     struct rdma_dev_addr *addr, void *context),
		    void *context)
{
	struct sockaddr *src_in, *dst_in;
	struct addr_req *req;
	int ret = 0;

	req = kzalloc(sizeof *req, GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	src_in = (struct sockaddr *) &req->src_addr;
	dst_in = (struct sockaddr *) &req->dst_addr;

	if (src_addr) {
		if (src_addr->sa_family != dst_addr->sa_family) {
			ret = -EINVAL;
			goto err;
		}

		memcpy(src_in, src_addr, ip_addr_size(src_addr));
	} else {
		src_in->sa_family = dst_addr->sa_family;
	}

	memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
	req->addr = addr;
	req->callback = callback;
	req->context = context;
	req->client = client;
	atomic_inc(&client->refcount);

	req->status = addr_resolve(src_in, dst_in, addr);
	switch (req->status) {
	case 0:
		req->timeout = jiffies;
		queue_req(req);
		break;
	case -ENODATA:
		req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
		queue_req(req);
		break;
	default:
		ret = req->status;
		atomic_dec(&client->refcount);
		goto err;
	}
	return ret;
err:
	kfree(req);
	return ret;
}
EXPORT_SYMBOL(rdma_resolve_ip);

void rdma_addr_cancel(struct rdma_dev_addr *addr)
{
	struct addr_req *req, *temp_req;

	mutex_lock(&lock);
	list_for_each_entry_safe(req, temp_req, &req_list, list) {
		if (req->addr == addr) {
			req->status = -ECANCELED;
			req->timeout = jiffies;
			list_move(&req->list, &req_list);
			set_timeout(req->timeout);
			break;
		}
	}
	mutex_unlock(&lock);
}
EXPORT_SYMBOL(rdma_addr_cancel);

static int netevent_callback(struct notifier_block *self, unsigned long event,
	void *ctx)
{
	if (event == NETEVENT_NEIGH_UPDATE) {
		struct neighbour *neigh = ctx;

		if (neigh->nud_state & NUD_VALID) {
			set_timeout(jiffies);
		}
	}
	return 0;
}

static struct notifier_block nb = {
	.notifier_call = netevent_callback
};

static int __init addr_init(void)
{
	addr_wq = create_singlethread_workqueue("ib_addr");
	if (!addr_wq)
		return -ENOMEM;

	register_netevent_notifier(&nb);
	return 0;
}

static void __exit addr_cleanup(void)
{
	unregister_netevent_notifier(&nb);
	destroy_workqueue(addr_wq);
}

module_init(addr_init);
module_exit(addr_cleanup);
Commit	Line	Data
7025fcd3 SH	1	/*
	2	* Copyright (c) 2005 Voltaire Inc. All rights reserved.
	3	* Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
	4	* Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
	5	* Copyright (c) 2005 Intel Corporation. All rights reserved.
	6	*
a9474917 SH	7	* This software is available to you under a choice of one of two
	8	* licenses. You may choose to be licensed under the terms of the GNU
	9	* General Public License (GPL) Version 2, available from the file
	10	* COPYING in the main directory of this source tree, or the
	11	* OpenIB.org BSD license below:
7025fcd3	12	*
a9474917 SH	13	* Redistribution and use in source and binary forms, with or
	14	* without modification, are permitted provided that the following
	15	* conditions are met:
7025fcd3	16	*
a9474917 SH	17	* - Redistributions of source code must retain the above
	18	* copyright notice, this list of conditions and the following
	19	* disclaimer.
7025fcd3	20	*
a9474917 SH	21	* - Redistributions in binary form must reproduce the above
	22	* copyright notice, this list of conditions and the following
	23	* disclaimer in the documentation and/or other materials
	24	* provided with the distribution.
7025fcd3	25	*
a9474917 SH	26	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	27	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	28	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	29	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	30	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	31	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	32	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	33	* SOFTWARE.
7025fcd3 SH	34	*/
	35
	36	#include <linux/mutex.h>
	37	#include <linux/inetdevice.h>
5a0e3ad6	38	#include <linux/slab.h>
7025fcd3	39	#include <linux/workqueue.h>
7025fcd3 SH	40	#include <net/arp.h>
	41	#include <net/neighbour.h>
	42	#include <net/route.h>
e795d092	43	#include <net/netevent.h>
38617c64 AS	44	#include <net/addrconf.h>
38617c64 AS	45	#include <net/ip6_route.h>
7025fcd3 SH	46	#include <rdma/ib_addr.h>
	47
	48	MODULE_AUTHOR("Sean Hefty");
	49	MODULE_DESCRIPTION("IB Address Translation");
	50	MODULE_LICENSE("Dual BSD/GPL");
	51
	52	struct addr_req {
	53	struct list_head list;
38617c64 AS	54	struct sockaddr_storage src_addr;
38617c64 AS	55	struct sockaddr_storage dst_addr;
7025fcd3	56	struct rdma_dev_addr *addr;
7a118df3	57	struct rdma_addr_client *client;
7025fcd3 SH	58	void *context;
	59	void (callback)(int status, struct sockaddr src_addr,
	60	struct rdma_dev_addr addr, void context);
	61	unsigned long timeout;
	62	int status;
	63	};
	64
c4028958	65	static void process_req(struct work_struct *work);
7025fcd3 SH	66
	67	static DEFINE_MUTEX(lock);
	68	static LIST_HEAD(req_list);
c4028958	69	static DECLARE_DELAYED_WORK(work, process_req);
7025fcd3 SH	70	static struct workqueue_struct *addr_wq;
7025fcd3 SH	71
7a118df3 SH	72	void rdma_addr_register_client(struct rdma_addr_client *client)
	73	{
	74	atomic_set(&client->refcount, 1);
	75	init_completion(&client->comp);
	76	}
	77	EXPORT_SYMBOL(rdma_addr_register_client);
	78
	79	static inline void put_client(struct rdma_addr_client *client)
	80	{
	81	if (atomic_dec_and_test(&client->refcount))
	82	complete(&client->comp);
	83	}
	84
	85	void rdma_addr_unregister_client(struct rdma_addr_client *client)
	86	{
	87	put_client(client);
	88	wait_for_completion(&client->comp);
	89	}
	90	EXPORT_SYMBOL(rdma_addr_unregister_client);
	91
07ebafba TT	92	int rdma_copy_addr(struct rdma_dev_addr dev_addr, struct net_device dev,
07ebafba TT	93	const unsigned char *dst_dev_addr)
7025fcd3	94	{
c4315d85	95	dev_addr->dev_type = dev->type;
7025fcd3 SH	96	memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	97	memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
	98	if (dst_dev_addr)
	99	memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
6266ed6e	100	dev_addr->bound_dev_if = dev->ifindex;
7025fcd3 SH	101	return 0;
7025fcd3 SH	102	}
07ebafba	103	EXPORT_SYMBOL(rdma_copy_addr);
7025fcd3 SH	104
	105	int rdma_translate_ip(struct sockaddr addr, struct rdma_dev_addr dev_addr)
	106	{
	107	struct net_device *dev;
38617c64	108	int ret = -EADDRNOTAVAIL;
7025fcd3	109
6266ed6e SH	110	if (dev_addr->bound_dev_if) {
	111	dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
	112	if (!dev)
	113	return -ENODEV;
	114	ret = rdma_copy_addr(dev_addr, dev, NULL);
	115	dev_put(dev);
	116	return ret;
	117	}
	118
38617c64 AS	119	switch (addr->sa_family) {
	120	case AF_INET:
	121	dev = ip_dev_find(&init_net,
	122	((struct sockaddr_in *) addr)->sin_addr.s_addr);
	123
	124	if (!dev)
	125	return ret;
7025fcd3	126
38617c64 AS	127	ret = rdma_copy_addr(dev_addr, dev, NULL);
	128	dev_put(dev);
	129	break;
2c4ab624 RD	130
2c4ab624 RD	131	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
38617c64	132	case AF_INET6:
22f4fbd9 ED	133	rcu_read_lock();
22f4fbd9 ED	134	for_each_netdev_rcu(&init_net, dev) {
38617c64 AS	135	if (ipv6_chk_addr(&init_net,
	136	&((struct sockaddr_in6 *) addr)->sin6_addr,
	137	dev, 1)) {
	138	ret = rdma_copy_addr(dev_addr, dev, NULL);
	139	break;
	140	}
	141	}
22f4fbd9	142	rcu_read_unlock();
38617c64	143	break;
2c4ab624	144	#endif
38617c64	145	}
7025fcd3 SH	146	return ret;
	147	}
	148	EXPORT_SYMBOL(rdma_translate_ip);
	149
	150	static void set_timeout(unsigned long time)
	151	{
	152	unsigned long delay;
	153
	154	cancel_delayed_work(&work);
	155
	156	delay = time - jiffies;
	157	if ((long)delay <= 0)
	158	delay = 1;
	159
	160	queue_delayed_work(addr_wq, &work, delay);
	161	}
	162
	163	static void queue_req(struct addr_req *req)
	164	{
	165	struct addr_req *temp_req;
	166
	167	mutex_lock(&lock);
	168	list_for_each_entry_reverse(temp_req, &req_list, list) {
f115db48	169	if (time_after_eq(req->timeout, temp_req->timeout))
7025fcd3 SH	170	break;
	171	}
	172
	173	list_add(&req->list, &temp_req->list);
	174
	175	if (req_list.next == &req->list)
	176	set_timeout(req->timeout);
	177	mutex_unlock(&lock);
	178	}
	179
923c100e SH	180	static int addr4_resolve(struct sockaddr_in *src_in,
	181	struct sockaddr_in *dst_in,
	182	struct rdma_dev_addr *addr)
7025fcd3	183	{
1b90c137 AV	184	__be32 src_ip = src_in->sin_addr.s_addr;
1b90c137 AV	185	__be32 dst_ip = dst_in->sin_addr.s_addr;
7025fcd3 SH	186	struct rtable *rt;
7025fcd3 SH	187	struct neighbour *neigh;
5fc3590c	188	struct flowi4 fl4;
7025fcd3 SH	189	int ret;
7025fcd3 SH	190
5fc3590c DM	191	memset(&fl4, 0, sizeof(fl4));
	192	fl4.daddr = dst_ip;
	193	fl4.saddr = src_ip;
	194	fl4.flowi4_oif = addr->bound_dev_if;
	195	rt = ip_route_output_key(&init_net, &fl4);
b23dd4fe DM	196	if (IS_ERR(rt)) {
b23dd4fe DM	197	ret = PTR_ERR(rt);
7025fcd3	198	goto out;
b23dd4fe	199	}
923c100e	200	src_in->sin_family = AF_INET;
5fc3590c	201	src_in->sin_addr.s_addr = fl4.saddr;
923c100e	202
72cdd1d9	203	if (rt->dst.dev->flags & IFF_LOOPBACK) {
923c100e SH	204	ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
	205	if (!ret)
	206	memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
	207	goto put;
	208	}
	209
7025fcd3	210	/* If the device does ARP internally, return 'done' */
72cdd1d9	211	if (rt->dst.dev->flags & IFF_NOARP) {
1bdd6384	212	ret = rdma_copy_addr(addr, rt->dst.dev, NULL);
7025fcd3 SH	213	goto put;
	214	}
	215
72cdd1d9	216	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->dst.dev);
923c100e	217	if (!neigh \|\| !(neigh->nud_state & NUD_VALID)) {
69cce1d1	218	neigh_event_send(dst_get_neighbour(&rt->dst), NULL);
7025fcd3	219	ret = -ENODATA;
923c100e SH	220	if (neigh)
923c100e SH	221	goto release;
7025fcd3 SH	222	goto put;
	223	}
	224
07ebafba	225	ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
7025fcd3 SH	226	release:
	227	neigh_release(neigh);
	228	put:
	229	ip_rt_put(rt);
	230	out:
	231	return ret;
	232	}
	233
2c4ab624	234	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
d14714df SH	235	static int addr6_resolve(struct sockaddr_in6 *src_in,
	236	struct sockaddr_in6 *dst_in,
	237	struct rdma_dev_addr *addr)
38617c64	238	{
4c9483b2	239	struct flowi6 fl6;
38617c64 AS	240	struct neighbour *neigh;
38617c64 AS	241	struct dst_entry *dst;
d14714df	242	int ret;
38617c64	243
4c9483b2 DM	244	memset(&fl6, 0, sizeof fl6);
	245	ipv6_addr_copy(&fl6.daddr, &dst_in->sin6_addr);
	246	ipv6_addr_copy(&fl6.saddr, &src_in->sin6_addr);
	247	fl6.flowi6_oif = addr->bound_dev_if;
38617c64	248
4c9483b2	249	dst = ip6_route_output(&init_net, NULL, &fl6);
d14714df SH	250	if ((ret = dst->error))
	251	goto put;
	252
4c9483b2	253	if (ipv6_addr_any(&fl6.saddr)) {
d14714df	254	ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
4c9483b2	255	&fl6.daddr, 0, &fl6.saddr);
d14714df SH	256	if (ret)
d14714df SH	257	goto put;
38617c64	258
d14714df	259	src_in->sin6_family = AF_INET6;
4c9483b2	260	ipv6_addr_copy(&src_in->sin6_addr, &fl6.saddr);
d14714df SH	261	}
	262
	263	if (dst->dev->flags & IFF_LOOPBACK) {
	264	ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
	265	if (!ret)
	266	memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
	267	goto put;
	268	}
	269
	270	/* If the device does ARP internally, return 'done' */
38617c64 AS	271	if (dst->dev->flags & IFF_NOARP) {
38617c64 AS	272	ret = rdma_copy_addr(addr, dst->dev, NULL);
d14714df	273	goto put;
38617c64 AS	274	}
38617c64 AS	275
69cce1d1	276	neigh = dst_get_neighbour(dst);
d14714df	277	if (!neigh \|\| !(neigh->nud_state & NUD_VALID)) {
69cce1d1 DM	278	if (neigh)
69cce1d1 DM	279	neigh_event_send(neigh, NULL);
d14714df SH	280	ret = -ENODATA;
	281	goto put;
	282	}
	283
	284	ret = rdma_copy_addr(addr, dst->dev, neigh->ha);
	285	put:
38617c64 AS	286	dst_release(dst);
	287	return ret;
	288	}
2c4ab624	289	#else
d14714df SH	290	static int addr6_resolve(struct sockaddr_in6 *src_in,
	291	struct sockaddr_in6 *dst_in,
	292	struct rdma_dev_addr *addr)
2c4ab624 RD	293	{
	294	return -EADDRNOTAVAIL;
	295	}
	296	#endif
38617c64	297
923c100e SH	298	static int addr_resolve(struct sockaddr *src_in,
	299	struct sockaddr *dst_in,
	300	struct rdma_dev_addr *addr)
38617c64 AS	301	{
38617c64 AS	302	if (src_in->sa_family == AF_INET) {
923c100e	303	return addr4_resolve((struct sockaddr_in *) src_in,
38617c64 AS	304	(struct sockaddr_in *) dst_in, addr);
38617c64 AS	305	} else
d14714df	306	return addr6_resolve((struct sockaddr_in6 *) src_in,
38617c64 AS	307	(struct sockaddr_in6 *) dst_in, addr);
	308	}
	309
c4028958	310	static void process_req(struct work_struct *work)
7025fcd3 SH	311	{
7025fcd3 SH	312	struct addr_req req, temp_req;
38617c64	313	struct sockaddr src_in, dst_in;
7025fcd3 SH	314	struct list_head done_list;
	315
	316	INIT_LIST_HEAD(&done_list);
	317
	318	mutex_lock(&lock);
	319	list_for_each_entry_safe(req, temp_req, &req_list, list) {
c78bb844	320	if (req->status == -ENODATA) {
38617c64 AS	321	src_in = (struct sockaddr *) &req->src_addr;
38617c64 AS	322	dst_in = (struct sockaddr *) &req->dst_addr;
923c100e	323	req->status = addr_resolve(src_in, dst_in, req->addr);
c78bb844 KK	324	if (req->status && time_after_eq(jiffies, req->timeout))
	325	req->status = -ETIMEDOUT;
	326	else if (req->status == -ENODATA)
	327	continue;
7025fcd3	328	}
04699a1f	329	list_move_tail(&req->list, &done_list);
7025fcd3 SH	330	}
	331
	332	if (!list_empty(&req_list)) {
	333	req = list_entry(req_list.next, struct addr_req, list);
	334	set_timeout(req->timeout);
	335	}
	336	mutex_unlock(&lock);
	337
	338	list_for_each_entry_safe(req, temp_req, &done_list, list) {
	339	list_del(&req->list);
38617c64 AS	340	req->callback(req->status, (struct sockaddr *) &req->src_addr,
38617c64 AS	341	req->addr, req->context);
7a118df3	342	put_client(req->client);
7025fcd3 SH	343	kfree(req);
	344	}
	345	}
	346
7a118df3 SH	347	int rdma_resolve_ip(struct rdma_addr_client *client,
7a118df3 SH	348	struct sockaddr src_addr, struct sockaddr dst_addr,
7025fcd3 SH	349	struct rdma_dev_addr *addr, int timeout_ms,
	350	void (callback)(int status, struct sockaddr src_addr,
	351	struct rdma_dev_addr addr, void context),
	352	void *context)
	353	{
38617c64	354	struct sockaddr src_in, dst_in;
7025fcd3 SH	355	struct addr_req *req;
	356	int ret = 0;
	357
dd00cc48	358	req = kzalloc(sizeof *req, GFP_KERNEL);
7025fcd3 SH	359	if (!req)
7025fcd3 SH	360	return -ENOMEM;
7025fcd3	361
d2e08862 SH	362	src_in = (struct sockaddr *) &req->src_addr;
	363	dst_in = (struct sockaddr *) &req->dst_addr;
	364
	365	if (src_addr) {
	366	if (src_addr->sa_family != dst_addr->sa_family) {
	367	ret = -EINVAL;
	368	goto err;
	369	}
	370
	371	memcpy(src_in, src_addr, ip_addr_size(src_addr));
	372	} else {
	373	src_in->sa_family = dst_addr->sa_family;
	374	}
	375
	376	memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
7025fcd3 SH	377	req->addr = addr;
	378	req->callback = callback;
	379	req->context = context;
7a118df3 SH	380	req->client = client;
7a118df3 SH	381	atomic_inc(&client->refcount);
7025fcd3	382
d14714df	383	req->status = addr_resolve(src_in, dst_in, addr);
7025fcd3 SH	384	switch (req->status) {
	385	case 0:
	386	req->timeout = jiffies;
	387	queue_req(req);
	388	break;
	389	case -ENODATA:
	390	req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
	391	queue_req(req);
7025fcd3 SH	392	break;
	393	default:
	394	ret = req->status;
7a118df3	395	atomic_dec(&client->refcount);
d2e08862	396	goto err;
7025fcd3 SH	397	}
7025fcd3 SH	398	return ret;
d2e08862 SH	399	err:
	400	kfree(req);
	401	return ret;
7025fcd3 SH	402	}
	403	EXPORT_SYMBOL(rdma_resolve_ip);
	404
	405	void rdma_addr_cancel(struct rdma_dev_addr *addr)
	406	{
	407	struct addr_req req, temp_req;
	408
	409	mutex_lock(&lock);
	410	list_for_each_entry_safe(req, temp_req, &req_list, list) {
	411	if (req->addr == addr) {
	412	req->status = -ECANCELED;
	413	req->timeout = jiffies;
04699a1f	414	list_move(&req->list, &req_list);
7025fcd3 SH	415	set_timeout(req->timeout);
	416	break;
	417	}
	418	}
	419	mutex_unlock(&lock);
	420	}
	421	EXPORT_SYMBOL(rdma_addr_cancel);
	422
3cd96564	423	static int netevent_callback(struct notifier_block *self, unsigned long event,
e795d092	424	void *ctx)
7025fcd3	425	{
3cd96564	426	if (event == NETEVENT_NEIGH_UPDATE) {
e795d092	427	struct neighbour *neigh = ctx;
7025fcd3	428
1f126670	429	if (neigh->nud_state & NUD_VALID) {
e795d092 TT	430	set_timeout(jiffies);
	431	}
	432	}
7025fcd3 SH	433	return 0;
	434	}
	435
e795d092 TT	436	static struct notifier_block nb = {
e795d092 TT	437	.notifier_call = netevent_callback
7025fcd3 SH	438	};
7025fcd3 SH	439
716abb1f	440	static int __init addr_init(void)
7025fcd3	441	{
c7f743a6	442	addr_wq = create_singlethread_workqueue("ib_addr");
7025fcd3 SH	443	if (!addr_wq)
	444	return -ENOMEM;
	445
e795d092	446	register_netevent_notifier(&nb);
7025fcd3 SH	447	return 0;
	448	}
	449
716abb1f	450	static void __exit addr_cleanup(void)
7025fcd3	451	{
e795d092	452	unregister_netevent_notifier(&nb);
7025fcd3 SH	453	destroy_workqueue(addr_wq);
	454	}
	455
	456	module_init(addr_init);
	457	module_exit(addr_cleanup);