infiniband: Convert dst_fetch_ha() over to dst_neigh_lookup().
[~shefty/rdma-dev.git] / drivers / infiniband / core / addr.c
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  *
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:
12  *
13  *     Redistribution and use in source and binary forms, with or
14  *     without modification, are permitted provided that the following
15  *     conditions are met:
16  *
17  *      - Redistributions of source code must retain the above
18  *        copyright notice, this list of conditions and the following
19  *        disclaimer.
20  *
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.
25  *
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.
34  */
35
36 #include <linux/mutex.h>
37 #include <linux/inetdevice.h>
38 #include <linux/slab.h>
39 #include <linux/workqueue.h>
40 #include <linux/module.h>
41 #include <net/arp.h>
42 #include <net/neighbour.h>
43 #include <net/route.h>
44 #include <net/netevent.h>
45 #include <net/addrconf.h>
46 #include <net/ip6_route.h>
47 #include <rdma/ib_addr.h>
48
49 MODULE_AUTHOR("Sean Hefty");
50 MODULE_DESCRIPTION("IB Address Translation");
51 MODULE_LICENSE("Dual BSD/GPL");
52
53 struct addr_req {
54         struct list_head list;
55         struct sockaddr_storage src_addr;
56         struct sockaddr_storage dst_addr;
57         struct rdma_dev_addr *addr;
58         struct rdma_addr_client *client;
59         void *context;
60         void (*callback)(int status, struct sockaddr *src_addr,
61                          struct rdma_dev_addr *addr, void *context);
62         unsigned long timeout;
63         int status;
64 };
65
66 static void process_req(struct work_struct *work);
67
68 static DEFINE_MUTEX(lock);
69 static LIST_HEAD(req_list);
70 static DECLARE_DELAYED_WORK(work, process_req);
71 static struct workqueue_struct *addr_wq;
72
73 void rdma_addr_register_client(struct rdma_addr_client *client)
74 {
75         atomic_set(&client->refcount, 1);
76         init_completion(&client->comp);
77 }
78 EXPORT_SYMBOL(rdma_addr_register_client);
79
80 static inline void put_client(struct rdma_addr_client *client)
81 {
82         if (atomic_dec_and_test(&client->refcount))
83                 complete(&client->comp);
84 }
85
86 void rdma_addr_unregister_client(struct rdma_addr_client *client)
87 {
88         put_client(client);
89         wait_for_completion(&client->comp);
90 }
91 EXPORT_SYMBOL(rdma_addr_unregister_client);
92
93 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
94                      const unsigned char *dst_dev_addr)
95 {
96         dev_addr->dev_type = dev->type;
97         memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
98         memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
99         if (dst_dev_addr)
100                 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
101         dev_addr->bound_dev_if = dev->ifindex;
102         return 0;
103 }
104 EXPORT_SYMBOL(rdma_copy_addr);
105
106 int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
107 {
108         struct net_device *dev;
109         int ret = -EADDRNOTAVAIL;
110
111         if (dev_addr->bound_dev_if) {
112                 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
113                 if (!dev)
114                         return -ENODEV;
115                 ret = rdma_copy_addr(dev_addr, dev, NULL);
116                 dev_put(dev);
117                 return ret;
118         }
119
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;
127
128                 ret = rdma_copy_addr(dev_addr, dev, NULL);
129                 dev_put(dev);
130                 break;
131
132 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
133         case AF_INET6:
134                 rcu_read_lock();
135                 for_each_netdev_rcu(&init_net, dev) {
136                         if (ipv6_chk_addr(&init_net,
137                                           &((struct sockaddr_in6 *) addr)->sin6_addr,
138                                           dev, 1)) {
139                                 ret = rdma_copy_addr(dev_addr, dev, NULL);
140                                 break;
141                         }
142                 }
143                 rcu_read_unlock();
144                 break;
145 #endif
146         }
147         return ret;
148 }
149 EXPORT_SYMBOL(rdma_translate_ip);
150
151 static void set_timeout(unsigned long time)
152 {
153         unsigned long delay;
154
155         cancel_delayed_work(&work);
156
157         delay = time - jiffies;
158         if ((long)delay <= 0)
159                 delay = 1;
160
161         queue_delayed_work(addr_wq, &work, delay);
162 }
163
164 static void queue_req(struct addr_req *req)
165 {
166         struct addr_req *temp_req;
167
168         mutex_lock(&lock);
169         list_for_each_entry_reverse(temp_req, &req_list, list) {
170                 if (time_after_eq(req->timeout, temp_req->timeout))
171                         break;
172         }
173
174         list_add(&req->list, &temp_req->list);
175
176         if (req_list.next == &req->list)
177                 set_timeout(req->timeout);
178         mutex_unlock(&lock);
179 }
180
181 static int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr, void *daddr)
182 {
183         struct neighbour *n;
184         int ret;
185
186         n = dst_neigh_lookup(dst, daddr);
187
188         rcu_read_lock();
189         if (!n || !(n->nud_state & NUD_VALID)) {
190                 if (n)
191                         neigh_event_send(n, NULL);
192                 ret = -ENODATA;
193         } else {
194                 ret = rdma_copy_addr(dev_addr, dst->dev, n->ha);
195         }
196         rcu_read_unlock();
197
198         if (n)
199                 neigh_release(n);
200
201         return ret;
202 }
203
204 static int addr4_resolve(struct sockaddr_in *src_in,
205                          struct sockaddr_in *dst_in,
206                          struct rdma_dev_addr *addr)
207 {
208         __be32 src_ip = src_in->sin_addr.s_addr;
209         __be32 dst_ip = dst_in->sin_addr.s_addr;
210         struct rtable *rt;
211         struct flowi4 fl4;
212         int ret;
213
214         memset(&fl4, 0, sizeof(fl4));
215         fl4.daddr = dst_ip;
216         fl4.saddr = src_ip;
217         fl4.flowi4_oif = addr->bound_dev_if;
218         rt = ip_route_output_key(&init_net, &fl4);
219         if (IS_ERR(rt)) {
220                 ret = PTR_ERR(rt);
221                 goto out;
222         }
223         src_in->sin_family = AF_INET;
224         src_in->sin_addr.s_addr = fl4.saddr;
225
226         if (rt->dst.dev->flags & IFF_LOOPBACK) {
227                 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
228                 if (!ret)
229                         memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
230                 goto put;
231         }
232
233         /* If the device does ARP internally, return 'done' */
234         if (rt->dst.dev->flags & IFF_NOARP) {
235                 ret = rdma_copy_addr(addr, rt->dst.dev, NULL);
236                 goto put;
237         }
238
239         ret = dst_fetch_ha(&rt->dst, addr, &fl4.daddr);
240 put:
241         ip_rt_put(rt);
242 out:
243         return ret;
244 }
245
246 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
247 static int addr6_resolve(struct sockaddr_in6 *src_in,
248                          struct sockaddr_in6 *dst_in,
249                          struct rdma_dev_addr *addr)
250 {
251         struct flowi6 fl6;
252         struct dst_entry *dst;
253         int ret;
254
255         memset(&fl6, 0, sizeof fl6);
256         fl6.daddr = dst_in->sin6_addr;
257         fl6.saddr = src_in->sin6_addr;
258         fl6.flowi6_oif = addr->bound_dev_if;
259
260         dst = ip6_route_output(&init_net, NULL, &fl6);
261         if ((ret = dst->error))
262                 goto put;
263
264         if (ipv6_addr_any(&fl6.saddr)) {
265                 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
266                                          &fl6.daddr, 0, &fl6.saddr);
267                 if (ret)
268                         goto put;
269
270                 src_in->sin6_family = AF_INET6;
271                 src_in->sin6_addr = fl6.saddr;
272         }
273
274         if (dst->dev->flags & IFF_LOOPBACK) {
275                 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr);
276                 if (!ret)
277                         memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
278                 goto put;
279         }
280
281         /* If the device does ARP internally, return 'done' */
282         if (dst->dev->flags & IFF_NOARP) {
283                 ret = rdma_copy_addr(addr, dst->dev, NULL);
284                 goto put;
285         }
286
287         ret = dst_fetch_ha(dst, addr, &fl6.daddr);
288 put:
289         dst_release(dst);
290         return ret;
291 }
292 #else
293 static int addr6_resolve(struct sockaddr_in6 *src_in,
294                          struct sockaddr_in6 *dst_in,
295                          struct rdma_dev_addr *addr)
296 {
297         return -EADDRNOTAVAIL;
298 }
299 #endif
300
301 static int addr_resolve(struct sockaddr *src_in,
302                         struct sockaddr *dst_in,
303                         struct rdma_dev_addr *addr)
304 {
305         if (src_in->sa_family == AF_INET) {
306                 return addr4_resolve((struct sockaddr_in *) src_in,
307                         (struct sockaddr_in *) dst_in, addr);
308         } else
309                 return addr6_resolve((struct sockaddr_in6 *) src_in,
310                         (struct sockaddr_in6 *) dst_in, addr);
311 }
312
313 static void process_req(struct work_struct *work)
314 {
315         struct addr_req *req, *temp_req;
316         struct sockaddr *src_in, *dst_in;
317         struct list_head done_list;
318
319         INIT_LIST_HEAD(&done_list);
320
321         mutex_lock(&lock);
322         list_for_each_entry_safe(req, temp_req, &req_list, list) {
323                 if (req->status == -ENODATA) {
324                         src_in = (struct sockaddr *) &req->src_addr;
325                         dst_in = (struct sockaddr *) &req->dst_addr;
326                         req->status = addr_resolve(src_in, dst_in, req->addr);
327                         if (req->status && time_after_eq(jiffies, req->timeout))
328                                 req->status = -ETIMEDOUT;
329                         else if (req->status == -ENODATA)
330                                 continue;
331                 }
332                 list_move_tail(&req->list, &done_list);
333         }
334
335         if (!list_empty(&req_list)) {
336                 req = list_entry(req_list.next, struct addr_req, list);
337                 set_timeout(req->timeout);
338         }
339         mutex_unlock(&lock);
340
341         list_for_each_entry_safe(req, temp_req, &done_list, list) {
342                 list_del(&req->list);
343                 req->callback(req->status, (struct sockaddr *) &req->src_addr,
344                         req->addr, req->context);
345                 put_client(req->client);
346                 kfree(req);
347         }
348 }
349
350 int rdma_resolve_ip(struct rdma_addr_client *client,
351                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
352                     struct rdma_dev_addr *addr, int timeout_ms,
353                     void (*callback)(int status, struct sockaddr *src_addr,
354                                      struct rdma_dev_addr *addr, void *context),
355                     void *context)
356 {
357         struct sockaddr *src_in, *dst_in;
358         struct addr_req *req;
359         int ret = 0;
360
361         req = kzalloc(sizeof *req, GFP_KERNEL);
362         if (!req)
363                 return -ENOMEM;
364
365         src_in = (struct sockaddr *) &req->src_addr;
366         dst_in = (struct sockaddr *) &req->dst_addr;
367
368         if (src_addr) {
369                 if (src_addr->sa_family != dst_addr->sa_family) {
370                         ret = -EINVAL;
371                         goto err;
372                 }
373
374                 memcpy(src_in, src_addr, ip_addr_size(src_addr));
375         } else {
376                 src_in->sa_family = dst_addr->sa_family;
377         }
378
379         memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
380         req->addr = addr;
381         req->callback = callback;
382         req->context = context;
383         req->client = client;
384         atomic_inc(&client->refcount);
385
386         req->status = addr_resolve(src_in, dst_in, addr);
387         switch (req->status) {
388         case 0:
389                 req->timeout = jiffies;
390                 queue_req(req);
391                 break;
392         case -ENODATA:
393                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
394                 queue_req(req);
395                 break;
396         default:
397                 ret = req->status;
398                 atomic_dec(&client->refcount);
399                 goto err;
400         }
401         return ret;
402 err:
403         kfree(req);
404         return ret;
405 }
406 EXPORT_SYMBOL(rdma_resolve_ip);
407
408 void rdma_addr_cancel(struct rdma_dev_addr *addr)
409 {
410         struct addr_req *req, *temp_req;
411
412         mutex_lock(&lock);
413         list_for_each_entry_safe(req, temp_req, &req_list, list) {
414                 if (req->addr == addr) {
415                         req->status = -ECANCELED;
416                         req->timeout = jiffies;
417                         list_move(&req->list, &req_list);
418                         set_timeout(req->timeout);
419                         break;
420                 }
421         }
422         mutex_unlock(&lock);
423 }
424 EXPORT_SYMBOL(rdma_addr_cancel);
425
426 static int netevent_callback(struct notifier_block *self, unsigned long event,
427         void *ctx)
428 {
429         if (event == NETEVENT_NEIGH_UPDATE) {
430                 struct neighbour *neigh = ctx;
431
432                 if (neigh->nud_state & NUD_VALID) {
433                         set_timeout(jiffies);
434                 }
435         }
436         return 0;
437 }
438
439 static struct notifier_block nb = {
440         .notifier_call = netevent_callback
441 };
442
443 static int __init addr_init(void)
444 {
445         addr_wq = create_singlethread_workqueue("ib_addr");
446         if (!addr_wq)
447                 return -ENOMEM;
448
449         register_netevent_notifier(&nb);
450         return 0;
451 }
452
453 static void __exit addr_cleanup(void)
454 {
455         unregister_netevent_notifier(&nb);
456         destroy_workqueue(addr_wq);
457 }
458
459 module_init(addr_init);
460 module_exit(addr_cleanup);