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.
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:
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
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.
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
36 #include <linux/mutex.h>
37 #include <linux/inetdevice.h>
38 #include <linux/workqueue.h>
40 #include <net/neighbour.h>
41 #include <net/route.h>
42 #include <net/netevent.h>
43 #include <net/addrconf.h>
44 #include <net/ip6_route.h>
45 #include <rdma/ib_addr.h>
47 MODULE_AUTHOR("Sean Hefty");
48 MODULE_DESCRIPTION("IB Address Translation");
49 MODULE_LICENSE("Dual BSD/GPL");
52 struct list_head list;
53 struct sockaddr_storage src_addr;
54 struct sockaddr_storage dst_addr;
55 struct rdma_dev_addr *addr;
56 struct rdma_addr_client *client;
58 void (*callback)(int status, struct sockaddr *src_addr,
59 struct rdma_dev_addr *addr, void *context);
60 unsigned long timeout;
64 static void process_req(struct work_struct *work);
66 static DEFINE_MUTEX(lock);
67 static LIST_HEAD(req_list);
68 static DECLARE_DELAYED_WORK(work, process_req);
69 static struct workqueue_struct *addr_wq;
71 void rdma_addr_register_client(struct rdma_addr_client *client)
73 atomic_set(&client->refcount, 1);
74 init_completion(&client->comp);
76 EXPORT_SYMBOL(rdma_addr_register_client);
78 static inline void put_client(struct rdma_addr_client *client)
80 if (atomic_dec_and_test(&client->refcount))
81 complete(&client->comp);
84 void rdma_addr_unregister_client(struct rdma_addr_client *client)
87 wait_for_completion(&client->comp);
89 EXPORT_SYMBOL(rdma_addr_unregister_client);
91 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
92 const unsigned char *dst_dev_addr)
94 dev_addr->dev_type = dev->type;
95 memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
96 memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
98 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
99 dev_addr->bound_dev_if = dev->ifindex;
102 EXPORT_SYMBOL(rdma_copy_addr);
104 int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
106 struct net_device *dev;
107 int ret = -EADDRNOTAVAIL;
109 if (dev_addr->bound_dev_if) {
110 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
113 ret = rdma_copy_addr(dev_addr, dev, NULL);
118 switch (addr->sa_family) {
120 dev = ip_dev_find(&init_net,
121 ((struct sockaddr_in *) addr)->sin_addr.s_addr);
126 ret = rdma_copy_addr(dev_addr, dev, NULL);
130 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132 read_lock(&dev_base_lock);
133 for_each_netdev(&init_net, dev) {
134 if (ipv6_chk_addr(&init_net,
135 &((struct sockaddr_in6 *) addr)->sin6_addr,
137 ret = rdma_copy_addr(dev_addr, dev, NULL);
141 read_unlock(&dev_base_lock);
147 EXPORT_SYMBOL(rdma_translate_ip);
149 static void set_timeout(unsigned long time)
153 cancel_delayed_work(&work);
155 delay = time - jiffies;
156 if ((long)delay <= 0)
159 queue_delayed_work(addr_wq, &work, delay);
162 static void queue_req(struct addr_req *req)
164 struct addr_req *temp_req;
167 list_for_each_entry_reverse(temp_req, &req_list, list) {
168 if (time_after_eq(req->timeout, temp_req->timeout))
172 list_add(&req->list, &temp_req->list);
174 if (req_list.next == &req->list)
175 set_timeout(req->timeout);
179 static int addr4_resolve(struct sockaddr_in *src_in,
180 struct sockaddr_in *dst_in,
181 struct rdma_dev_addr *addr)
183 __be32 src_ip = src_in->sin_addr.s_addr;
184 __be32 dst_ip = dst_in->sin_addr.s_addr;
187 struct neighbour *neigh;
190 memset(&fl, 0, sizeof fl);
191 fl.nl_u.ip4_u.daddr = dst_ip;
192 fl.nl_u.ip4_u.saddr = src_ip;
193 fl.oif = addr->bound_dev_if;
195 ret = ip_route_output_key(&init_net, &rt, &fl);
199 src_in->sin_family = AF_INET;
200 src_in->sin_addr.s_addr = rt->rt_src;
202 if (rt->idev->dev->flags & IFF_LOOPBACK) {
203 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
205 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
209 /* If the device does ARP internally, return 'done' */
210 if (rt->idev->dev->flags & IFF_NOARP) {
211 rdma_copy_addr(addr, rt->idev->dev, NULL);
215 neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
216 if (!neigh || !(neigh->nud_state & NUD_VALID)) {
217 neigh_event_send(rt->u.dst.neighbour, NULL);
224 ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
226 neigh_release(neigh);
233 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
234 static int addr6_resolve(struct sockaddr_in6 *src_in,
235 struct sockaddr_in6 *dst_in,
236 struct rdma_dev_addr *addr)
239 struct neighbour *neigh;
240 struct dst_entry *dst;
243 memset(&fl, 0, sizeof fl);
244 ipv6_addr_copy(&fl.fl6_dst, &dst_in->sin6_addr);
245 ipv6_addr_copy(&fl.fl6_src, &src_in->sin6_addr);
246 fl.oif = addr->bound_dev_if;
248 dst = ip6_route_output(&init_net, NULL, &fl);
249 if ((ret = dst->error))
252 if (ipv6_addr_any(&fl.fl6_src)) {
253 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
254 &fl.fl6_dst, 0, &fl.fl6_src);
258 src_in->sin6_family = AF_INET6;
259 ipv6_addr_copy(&src_in->sin6_addr, &fl.fl6_src);
262 if (dst->dev->flags & IFF_LOOPBACK) {
263 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
265 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
269 /* If the device does ARP internally, return 'done' */
270 if (dst->dev->flags & IFF_NOARP) {
271 ret = rdma_copy_addr(addr, dst->dev, NULL);
275 neigh = dst->neighbour;
276 if (!neigh || !(neigh->nud_state & NUD_VALID)) {
277 neigh_event_send(dst->neighbour, NULL);
282 ret = rdma_copy_addr(addr, dst->dev, neigh->ha);
288 static int addr6_resolve(struct sockaddr_in6 *src_in,
289 struct sockaddr_in6 *dst_in,
290 struct rdma_dev_addr *addr)
292 return -EADDRNOTAVAIL;
296 static int addr_resolve(struct sockaddr *src_in,
297 struct sockaddr *dst_in,
298 struct rdma_dev_addr *addr)
300 if (src_in->sa_family == AF_INET) {
301 return addr4_resolve((struct sockaddr_in *) src_in,
302 (struct sockaddr_in *) dst_in, addr);
304 return addr6_resolve((struct sockaddr_in6 *) src_in,
305 (struct sockaddr_in6 *) dst_in, addr);
308 static void process_req(struct work_struct *work)
310 struct addr_req *req, *temp_req;
311 struct sockaddr *src_in, *dst_in;
312 struct list_head done_list;
314 INIT_LIST_HEAD(&done_list);
317 list_for_each_entry_safe(req, temp_req, &req_list, list) {
318 if (req->status == -ENODATA) {
319 src_in = (struct sockaddr *) &req->src_addr;
320 dst_in = (struct sockaddr *) &req->dst_addr;
321 req->status = addr_resolve(src_in, dst_in, req->addr);
322 if (req->status && time_after_eq(jiffies, req->timeout))
323 req->status = -ETIMEDOUT;
324 else if (req->status == -ENODATA)
327 list_move_tail(&req->list, &done_list);
330 if (!list_empty(&req_list)) {
331 req = list_entry(req_list.next, struct addr_req, list);
332 set_timeout(req->timeout);
336 list_for_each_entry_safe(req, temp_req, &done_list, list) {
337 list_del(&req->list);
338 req->callback(req->status, (struct sockaddr *) &req->src_addr,
339 req->addr, req->context);
340 put_client(req->client);
345 int rdma_resolve_ip(struct rdma_addr_client *client,
346 struct sockaddr *src_addr, struct sockaddr *dst_addr,
347 struct rdma_dev_addr *addr, int timeout_ms,
348 void (*callback)(int status, struct sockaddr *src_addr,
349 struct rdma_dev_addr *addr, void *context),
352 struct sockaddr *src_in, *dst_in;
353 struct addr_req *req;
356 req = kzalloc(sizeof *req, GFP_KERNEL);
360 src_in = (struct sockaddr *) &req->src_addr;
361 dst_in = (struct sockaddr *) &req->dst_addr;
364 if (src_addr->sa_family != dst_addr->sa_family) {
369 memcpy(src_in, src_addr, ip_addr_size(src_addr));
371 src_in->sa_family = dst_addr->sa_family;
374 memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
376 req->callback = callback;
377 req->context = context;
378 req->client = client;
379 atomic_inc(&client->refcount);
381 req->status = addr_resolve(src_in, dst_in, addr);
382 switch (req->status) {
384 req->timeout = jiffies;
388 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
393 atomic_dec(&client->refcount);
401 EXPORT_SYMBOL(rdma_resolve_ip);
403 void rdma_addr_cancel(struct rdma_dev_addr *addr)
405 struct addr_req *req, *temp_req;
408 list_for_each_entry_safe(req, temp_req, &req_list, list) {
409 if (req->addr == addr) {
410 req->status = -ECANCELED;
411 req->timeout = jiffies;
412 list_move(&req->list, &req_list);
413 set_timeout(req->timeout);
419 EXPORT_SYMBOL(rdma_addr_cancel);
421 static int netevent_callback(struct notifier_block *self, unsigned long event,
424 if (event == NETEVENT_NEIGH_UPDATE) {
425 struct neighbour *neigh = ctx;
427 if (neigh->nud_state & NUD_VALID) {
428 set_timeout(jiffies);
434 static struct notifier_block nb = {
435 .notifier_call = netevent_callback
438 static int __init addr_init(void)
440 addr_wq = create_singlethread_workqueue("ib_addr");
444 register_netevent_notifier(&nb);
448 static void __exit addr_cleanup(void)
450 unregister_netevent_notifier(&nb);
451 destroy_workqueue(addr_wq);
454 module_init(addr_init);
455 module_exit(addr_cleanup);