[net-next-2.6.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/workqueue.h>
#include <linux/if_arp.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)
{
	switch (dev->type) {
	case ARPHRD_INFINIBAND:
		dev_addr->dev_type = RDMA_NODE_IB_CA;
		break;
	case ARPHRD_ETHER:
		dev_addr->dev_type = RDMA_NODE_RNIC;
		break;
	default:
		return -EADDRNOTAVAIL;
	}

	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->src_dev = dev;
	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;

	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:
		for_each_netdev(&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;
			}
		}
		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 void addr_send_arp(struct sockaddr *dst_in)
{
	struct rtable *rt;
	struct flowi fl;

	memset(&fl, 0, sizeof fl);

	switch (dst_in->sa_family) {
	case AF_INET:
		fl.nl_u.ip4_u.daddr =
			((struct sockaddr_in *) dst_in)->sin_addr.s_addr;

		if (ip_route_output_key(&init_net, &rt, &fl))
			return;

		neigh_event_send(rt->u.dst.neighbour, NULL);
		ip_rt_put(rt);
		break;

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case AF_INET6:
	{
		struct dst_entry *dst;

		fl.nl_u.ip6_u.daddr =
			((struct sockaddr_in6 *) dst_in)->sin6_addr;

		dst = ip6_route_output(&init_net, NULL, &fl);
		if (!dst)
			return;

		neigh_event_send(dst->neighbour, NULL);
		dst_release(dst);
		break;
	}
#endif
	}
}

static int addr4_resolve_remote(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 flowi fl;
	struct rtable *rt;
	struct neighbour *neigh;
	int ret;

	memset(&fl, 0, sizeof fl);
	fl.nl_u.ip4_u.daddr = dst_ip;
	fl.nl_u.ip4_u.saddr = src_ip;
	ret = ip_route_output_key(&init_net, &rt, &fl);
	if (ret)
		goto out;

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

	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
	if (!neigh) {
		ret = -ENODATA;
		goto put;
	}

	if (!(neigh->nud_state & NUD_VALID)) {
		ret = -ENODATA;
		goto release;
	}

	if (!src_ip) {
		src_in->sin_family = dst_in->sin_family;
		src_in->sin_addr.s_addr = rt->rt_src;
	}

	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_remote(struct sockaddr_in6 *src_in,
			       struct sockaddr_in6 *dst_in,
			       struct rdma_dev_addr *addr)
{
	struct flowi fl;
	struct neighbour *neigh;
	struct dst_entry *dst;
	int ret = -ENODATA;

	memset(&fl, 0, sizeof fl);
	fl.nl_u.ip6_u.daddr = dst_in->sin6_addr;
	fl.nl_u.ip6_u.saddr = src_in->sin6_addr;

	dst = ip6_route_output(&init_net, NULL, &fl);
	if (!dst)
		return ret;

	if (dst->dev->flags & IFF_NOARP) {
		ret = rdma_copy_addr(addr, dst->dev, NULL);
	} else {
		neigh = dst->neighbour;
		if (neigh && (neigh->nud_state & NUD_VALID))
			ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
	}

	dst_release(dst);
	return ret;
}
#else
static int addr6_resolve_remote(struct sockaddr_in6 *src_in,
			       struct sockaddr_in6 *dst_in,
			       struct rdma_dev_addr *addr)
{
	return -EADDRNOTAVAIL;
}
#endif

static int addr_resolve_remote(struct sockaddr *src_in,
				struct sockaddr *dst_in,
				struct rdma_dev_addr *addr)
{
	if (src_in->sa_family == AF_INET) {
		return addr4_resolve_remote((struct sockaddr_in *) src_in,
			(struct sockaddr_in *) dst_in, addr);
	} else
		return addr6_resolve_remote((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_remote(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);
	}
}

static int addr_resolve_local(struct sockaddr *src_in,
			      struct sockaddr *dst_in,
			      struct rdma_dev_addr *addr)
{
	struct net_device *dev;
	int ret;

	switch (dst_in->sa_family) {
	case AF_INET:
	{
		__be32 src_ip = ((struct sockaddr_in *) src_in)->sin_addr.s_addr;
		__be32 dst_ip = ((struct sockaddr_in *) dst_in)->sin_addr.s_addr;

		dev = ip_dev_find(&init_net, dst_ip);
		if (!dev)
			return -EADDRNOTAVAIL;

		if (ipv4_is_zeronet(src_ip)) {
			src_in->sa_family = dst_in->sa_family;
			((struct sockaddr_in *) src_in)->sin_addr.s_addr = dst_ip;
			ret = rdma_copy_addr(addr, dev, dev->dev_addr);
		} else if (ipv4_is_loopback(src_ip)) {
			ret = rdma_translate_ip(dst_in, addr);
			if (!ret)
				memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
		} else {
			ret = rdma_translate_ip(src_in, addr);
			if (!ret)
				memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
		}
		dev_put(dev);
		break;
	}

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	case AF_INET6:
	{
		struct in6_addr *a;

		for_each_netdev(&init_net, dev)
			if (ipv6_chk_addr(&init_net,
					  &((struct sockaddr_in6 *) addr)->sin6_addr,
					  dev, 1))
				break;

		if (!dev)
			return -EADDRNOTAVAIL;

		a = &((struct sockaddr_in6 *) src_in)->sin6_addr;

		if (ipv6_addr_any(a)) {
			src_in->sa_family = dst_in->sa_family;
			((struct sockaddr_in6 *) src_in)->sin6_addr =
				((struct sockaddr_in6 *) dst_in)->sin6_addr;
			ret = rdma_copy_addr(addr, dev, dev->dev_addr);
		} else if (ipv6_addr_loopback(a)) {
			ret = rdma_translate_ip(dst_in, addr);
			if (!ret)
				memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
		} else  {
			ret = rdma_translate_ip(src_in, addr);
			if (!ret)
				memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
		}
		break;
	}
#endif

	default:
		ret = -EADDRNOTAVAIL;
		break;
	}

	return ret;
}

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;

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

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

	req->status = addr_resolve_local(src_in, dst_in, addr);
	if (req->status == -EADDRNOTAVAIL)
		req->status = addr_resolve_remote(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);
		addr_send_arp(dst_in);
		break;
	default:
		ret = req->status;
		atomic_dec(&client->refcount);
		kfree(req);
		break;
	}
	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 addr_init(void)
{
	addr_wq = create_singlethread_workqueue("ib_addr");
	if (!addr_wq)
		return -ENOMEM;

	register_netevent_notifier(&nb);
	return 0;
}

static void 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>
	38	#include <linux/workqueue.h>
	39	#include <linux/if_arp.h>
	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 SH	94	{
	95	switch (dev->type) {
	96	case ARPHRD_INFINIBAND:
07ebafba TT	97	dev_addr->dev_type = RDMA_NODE_IB_CA;
	98	break;
	99	case ARPHRD_ETHER:
	100	dev_addr->dev_type = RDMA_NODE_RNIC;
7025fcd3 SH	101	break;
	102	default:
	103	return -EADDRNOTAVAIL;
	104	}
	105
	106	memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	107	memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
	108	if (dst_dev_addr)
	109	memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
64c5e613	110	dev_addr->src_dev = dev;
7025fcd3 SH	111	return 0;
7025fcd3 SH	112	}
07ebafba	113	EXPORT_SYMBOL(rdma_copy_addr);
7025fcd3 SH	114
	115	int rdma_translate_ip(struct sockaddr addr, struct rdma_dev_addr dev_addr)
	116	{
	117	struct net_device *dev;
38617c64	118	int ret = -EADDRNOTAVAIL;
7025fcd3	119
38617c64 AS	120	switch (addr->sa_family) {
	121	case AF_INET:
	122	dev = ip_dev_find(&init_net,
	123	((struct sockaddr_in *) addr)->sin_addr.s_addr);
	124
	125	if (!dev)
	126	return ret;
7025fcd3	127
38617c64 AS	128	ret = rdma_copy_addr(dev_addr, dev, NULL);
	129	dev_put(dev);
	130	break;
2c4ab624 RD	131
2c4ab624 RD	132	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
38617c64 AS	133	case AF_INET6:
	134	for_each_netdev(&init_net, dev) {
	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	}
	142	break;
2c4ab624	143	#endif
38617c64	144	}
7025fcd3 SH	145	return ret;
	146	}
	147	EXPORT_SYMBOL(rdma_translate_ip);
	148
	149	static void set_timeout(unsigned long time)
	150	{
	151	unsigned long delay;
	152
	153	cancel_delayed_work(&work);
	154
	155	delay = time - jiffies;
	156	if ((long)delay <= 0)
	157	delay = 1;
	158
	159	queue_delayed_work(addr_wq, &work, delay);
	160	}
	161
	162	static void queue_req(struct addr_req *req)
	163	{
	164	struct addr_req *temp_req;
	165
	166	mutex_lock(&lock);
	167	list_for_each_entry_reverse(temp_req, &req_list, list) {
f115db48	168	if (time_after_eq(req->timeout, temp_req->timeout))
7025fcd3 SH	169	break;
	170	}
	171
	172	list_add(&req->list, &temp_req->list);
	173
	174	if (req_list.next == &req->list)
	175	set_timeout(req->timeout);
	176	mutex_unlock(&lock);
	177	}
	178
38617c64	179	static void addr_send_arp(struct sockaddr *dst_in)
7025fcd3 SH	180	{
	181	struct rtable *rt;
	182	struct flowi fl;
7025fcd3 SH	183
7025fcd3 SH	184	memset(&fl, 0, sizeof fl);
2c4ab624 RD	185
	186	switch (dst_in->sa_family) {
	187	case AF_INET:
38617c64 AS	188	fl.nl_u.ip4_u.daddr =
38617c64 AS	189	((struct sockaddr_in *) dst_in)->sin_addr.s_addr;
7025fcd3	190
38617c64 AS	191	if (ip_route_output_key(&init_net, &rt, &fl))
	192	return;
	193
	194	neigh_event_send(rt->u.dst.neighbour, NULL);
	195	ip_rt_put(rt);
2c4ab624 RD	196	break;
	197
	198	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	199	case AF_INET6:
	200	{
	201	struct dst_entry *dst;
38617c64	202
38617c64 AS	203	fl.nl_u.ip6_u.daddr =
	204	((struct sockaddr_in6 *) dst_in)->sin6_addr;
	205
	206	dst = ip6_route_output(&init_net, NULL, &fl);
	207	if (!dst)
	208	return;
	209
	210	neigh_event_send(dst->neighbour, NULL);
	211	dst_release(dst);
2c4ab624 RD	212	break;
	213	}
	214	#endif
38617c64	215	}
7025fcd3 SH	216	}
7025fcd3 SH	217
38617c64	218	static int addr4_resolve_remote(struct sockaddr_in *src_in,
7025fcd3 SH	219	struct sockaddr_in *dst_in,
	220	struct rdma_dev_addr *addr)
	221	{
1b90c137 AV	222	__be32 src_ip = src_in->sin_addr.s_addr;
1b90c137 AV	223	__be32 dst_ip = dst_in->sin_addr.s_addr;
7025fcd3 SH	224	struct flowi fl;
	225	struct rtable *rt;
	226	struct neighbour *neigh;
	227	int ret;
	228
	229	memset(&fl, 0, sizeof fl);
	230	fl.nl_u.ip4_u.daddr = dst_ip;
	231	fl.nl_u.ip4_u.saddr = src_ip;
f206351a	232	ret = ip_route_output_key(&init_net, &rt, &fl);
7025fcd3 SH	233	if (ret)
	234	goto out;
	235
	236	/* If the device does ARP internally, return 'done' */
	237	if (rt->idev->dev->flags & IFF_NOARP) {
07ebafba	238	rdma_copy_addr(addr, rt->idev->dev, NULL);
7025fcd3 SH	239	goto put;
	240	}
	241
	242	neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
	243	if (!neigh) {
	244	ret = -ENODATA;
	245	goto put;
	246	}
	247
	248	if (!(neigh->nud_state & NUD_VALID)) {
	249	ret = -ENODATA;
	250	goto release;
	251	}
	252
	253	if (!src_ip) {
	254	src_in->sin_family = dst_in->sin_family;
	255	src_in->sin_addr.s_addr = rt->rt_src;
	256	}
	257
07ebafba	258	ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
7025fcd3 SH	259	release:
	260	neigh_release(neigh);
	261	put:
	262	ip_rt_put(rt);
	263	out:
	264	return ret;
	265	}
	266
2c4ab624	267	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
38617c64 AS	268	static int addr6_resolve_remote(struct sockaddr_in6 *src_in,
	269	struct sockaddr_in6 *dst_in,
	270	struct rdma_dev_addr *addr)
	271	{
	272	struct flowi fl;
	273	struct neighbour *neigh;
	274	struct dst_entry *dst;
	275	int ret = -ENODATA;
	276
	277	memset(&fl, 0, sizeof fl);
	278	fl.nl_u.ip6_u.daddr = dst_in->sin6_addr;
	279	fl.nl_u.ip6_u.saddr = src_in->sin6_addr;
	280
	281	dst = ip6_route_output(&init_net, NULL, &fl);
	282	if (!dst)
	283	return ret;
	284
	285	if (dst->dev->flags & IFF_NOARP) {
	286	ret = rdma_copy_addr(addr, dst->dev, NULL);
	287	} else {
	288	neigh = dst->neighbour;
	289	if (neigh && (neigh->nud_state & NUD_VALID))
	290	ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
	291	}
	292
	293	dst_release(dst);
	294	return ret;
	295	}
2c4ab624 RD	296	#else
	297	static int addr6_resolve_remote(struct sockaddr_in6 *src_in,
	298	struct sockaddr_in6 *dst_in,
	299	struct rdma_dev_addr *addr)
	300	{
	301	return -EADDRNOTAVAIL;
	302	}
	303	#endif
38617c64 AS	304
	305	static int addr_resolve_remote(struct sockaddr *src_in,
	306	struct sockaddr *dst_in,
	307	struct rdma_dev_addr *addr)
	308	{
	309	if (src_in->sa_family == AF_INET) {
	310	return addr4_resolve_remote((struct sockaddr_in *) src_in,
	311	(struct sockaddr_in *) dst_in, addr);
	312	} else
	313	return addr6_resolve_remote((struct sockaddr_in6 *) src_in,
	314	(struct sockaddr_in6 *) dst_in, addr);
	315	}
	316
c4028958	317	static void process_req(struct work_struct *work)
7025fcd3 SH	318	{
7025fcd3 SH	319	struct addr_req req, temp_req;
38617c64	320	struct sockaddr src_in, dst_in;
7025fcd3 SH	321	struct list_head done_list;
	322
	323	INIT_LIST_HEAD(&done_list);
	324
	325	mutex_lock(&lock);
	326	list_for_each_entry_safe(req, temp_req, &req_list, list) {
c78bb844	327	if (req->status == -ENODATA) {
38617c64 AS	328	src_in = (struct sockaddr *) &req->src_addr;
38617c64 AS	329	dst_in = (struct sockaddr *) &req->dst_addr;
7025fcd3 SH	330	req->status = addr_resolve_remote(src_in, dst_in,
7025fcd3 SH	331	req->addr);
c78bb844 KK	332	if (req->status && time_after_eq(jiffies, req->timeout))
	333	req->status = -ETIMEDOUT;
	334	else if (req->status == -ENODATA)
	335	continue;
7025fcd3	336	}
04699a1f	337	list_move_tail(&req->list, &done_list);
7025fcd3 SH	338	}
	339
	340	if (!list_empty(&req_list)) {
	341	req = list_entry(req_list.next, struct addr_req, list);
	342	set_timeout(req->timeout);
	343	}
	344	mutex_unlock(&lock);
	345
	346	list_for_each_entry_safe(req, temp_req, &done_list, list) {
	347	list_del(&req->list);
38617c64 AS	348	req->callback(req->status, (struct sockaddr *) &req->src_addr,
38617c64 AS	349	req->addr, req->context);
7a118df3	350	put_client(req->client);
7025fcd3 SH	351	kfree(req);
	352	}
	353	}
	354
38617c64 AS	355	static int addr_resolve_local(struct sockaddr *src_in,
38617c64 AS	356	struct sockaddr *dst_in,
7025fcd3 SH	357	struct rdma_dev_addr *addr)
	358	{
	359	struct net_device *dev;
7025fcd3 SH	360	int ret;
7025fcd3 SH	361
2c4ab624 RD	362	switch (dst_in->sa_family) {
	363	case AF_INET:
	364	{
38617c64 AS	365	__be32 src_ip = ((struct sockaddr_in *) src_in)->sin_addr.s_addr;
	366	__be32 dst_ip = ((struct sockaddr_in *) dst_in)->sin_addr.s_addr;
	367
	368	dev = ip_dev_find(&init_net, dst_ip);
	369	if (!dev)
	370	return -EADDRNOTAVAIL;
	371
	372	if (ipv4_is_zeronet(src_ip)) {
	373	src_in->sa_family = dst_in->sa_family;
	374	((struct sockaddr_in *) src_in)->sin_addr.s_addr = dst_ip;
	375	ret = rdma_copy_addr(addr, dev, dev->dev_addr);
	376	} else if (ipv4_is_loopback(src_ip)) {
	377	ret = rdma_translate_ip(dst_in, addr);
	378	if (!ret)
	379	memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	380	} else {
	381	ret = rdma_translate_ip(src_in, addr);
	382	if (!ret)
	383	memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	384	}
	385	dev_put(dev);
2c4ab624 RD	386	break;
	387	}
	388
	389	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	390	case AF_INET6:
	391	{
38617c64 AS	392	struct in6_addr *a;
	393
	394	for_each_netdev(&init_net, dev)
	395	if (ipv6_chk_addr(&init_net,
	396	&((struct sockaddr_in6 *) addr)->sin6_addr,
	397	dev, 1))
	398	break;
	399
	400	if (!dev)
	401	return -EADDRNOTAVAIL;
	402
	403	a = &((struct sockaddr_in6 *) src_in)->sin6_addr;
	404
	405	if (ipv6_addr_any(a)) {
	406	src_in->sa_family = dst_in->sa_family;
	407	((struct sockaddr_in6 *) src_in)->sin6_addr =
	408	((struct sockaddr_in6 *) dst_in)->sin6_addr;
	409	ret = rdma_copy_addr(addr, dev, dev->dev_addr);
	410	} else if (ipv6_addr_loopback(a)) {
	411	ret = rdma_translate_ip(dst_in, addr);
	412	if (!ret)
	413	memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	414	} else {
	415	ret = rdma_translate_ip(src_in, addr);
	416	if (!ret)
	417	memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
	418	}
2c4ab624 RD	419	break;
	420	}
	421	#endif
	422
	423	default:
	424	ret = -EADDRNOTAVAIL;
	425	break;
7025fcd3 SH	426	}
7025fcd3 SH	427
7025fcd3 SH	428	return ret;
	429	}
	430
7a118df3 SH	431	int rdma_resolve_ip(struct rdma_addr_client *client,
7a118df3 SH	432	struct sockaddr src_addr, struct sockaddr dst_addr,
7025fcd3 SH	433	struct rdma_dev_addr *addr, int timeout_ms,
	434	void (callback)(int status, struct sockaddr src_addr,
	435	struct rdma_dev_addr addr, void context),
	436	void *context)
	437	{
38617c64	438	struct sockaddr src_in, dst_in;
7025fcd3 SH	439	struct addr_req *req;
	440	int ret = 0;
	441
dd00cc48	442	req = kzalloc(sizeof *req, GFP_KERNEL);
7025fcd3 SH	443	if (!req)
7025fcd3 SH	444	return -ENOMEM;
7025fcd3 SH	445
	446	if (src_addr)
	447	memcpy(&req->src_addr, src_addr, ip_addr_size(src_addr));
	448	memcpy(&req->dst_addr, dst_addr, ip_addr_size(dst_addr));
	449	req->addr = addr;
	450	req->callback = callback;
	451	req->context = context;
7a118df3 SH	452	req->client = client;
7a118df3 SH	453	atomic_inc(&client->refcount);
7025fcd3	454
38617c64 AS	455	src_in = (struct sockaddr *) &req->src_addr;
38617c64 AS	456	dst_in = (struct sockaddr *) &req->dst_addr;
7025fcd3 SH	457
	458	req->status = addr_resolve_local(src_in, dst_in, addr);
	459	if (req->status == -EADDRNOTAVAIL)
	460	req->status = addr_resolve_remote(src_in, dst_in, addr);
	461
	462	switch (req->status) {
	463	case 0:
	464	req->timeout = jiffies;
	465	queue_req(req);
	466	break;
	467	case -ENODATA:
	468	req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
	469	queue_req(req);
	470	addr_send_arp(dst_in);
	471	break;
	472	default:
	473	ret = req->status;
7a118df3	474	atomic_dec(&client->refcount);
7025fcd3 SH	475	kfree(req);
	476	break;
	477	}
	478	return ret;
	479	}
	480	EXPORT_SYMBOL(rdma_resolve_ip);
	481
	482	void rdma_addr_cancel(struct rdma_dev_addr *addr)
	483	{
	484	struct addr_req req, temp_req;
	485
	486	mutex_lock(&lock);
	487	list_for_each_entry_safe(req, temp_req, &req_list, list) {
	488	if (req->addr == addr) {
	489	req->status = -ECANCELED;
	490	req->timeout = jiffies;
04699a1f	491	list_move(&req->list, &req_list);
7025fcd3 SH	492	set_timeout(req->timeout);
	493	break;
	494	}
	495	}
	496	mutex_unlock(&lock);
	497	}
	498	EXPORT_SYMBOL(rdma_addr_cancel);
	499
3cd96564	500	static int netevent_callback(struct notifier_block *self, unsigned long event,
e795d092	501	void *ctx)
7025fcd3	502	{
3cd96564	503	if (event == NETEVENT_NEIGH_UPDATE) {
e795d092	504	struct neighbour *neigh = ctx;
7025fcd3	505
1f126670	506	if (neigh->nud_state & NUD_VALID) {
e795d092 TT	507	set_timeout(jiffies);
	508	}
	509	}
7025fcd3 SH	510	return 0;
	511	}
	512
e795d092 TT	513	static struct notifier_block nb = {
e795d092 TT	514	.notifier_call = netevent_callback
7025fcd3 SH	515	};
	516
	517	static int addr_init(void)
	518	{
c7f743a6	519	addr_wq = create_singlethread_workqueue("ib_addr");
7025fcd3 SH	520	if (!addr_wq)
	521	return -ENOMEM;
	522
e795d092	523	register_netevent_notifier(&nb);
7025fcd3 SH	524	return 0;
	525	}
	526
	527	static void addr_cleanup(void)
	528	{
e795d092	529	unregister_netevent_notifier(&nb);
7025fcd3 SH	530	destroy_workqueue(addr_wq);
	531	}
	532
	533	module_init(addr_init);
	534	module_exit(addr_cleanup);