Commit | Line | Data |
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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> | |
7025fcd3 SH |
39 | #include <net/arp.h> |
40 | #include <net/neighbour.h> | |
41 | #include <net/route.h> | |
e795d092 | 42 | #include <net/netevent.h> |
38617c64 AS |
43 | #include <net/addrconf.h> |
44 | #include <net/ip6_route.h> | |
7025fcd3 SH |
45 | #include <rdma/ib_addr.h> |
46 | ||
47 | MODULE_AUTHOR("Sean Hefty"); | |
48 | MODULE_DESCRIPTION("IB Address Translation"); | |
49 | MODULE_LICENSE("Dual BSD/GPL"); | |
50 | ||
51 | struct addr_req { | |
52 | struct list_head list; | |
38617c64 AS |
53 | struct sockaddr_storage src_addr; |
54 | struct sockaddr_storage dst_addr; | |
7025fcd3 | 55 | struct rdma_dev_addr *addr; |
7a118df3 | 56 | struct rdma_addr_client *client; |
7025fcd3 SH |
57 | void *context; |
58 | void (*callback)(int status, struct sockaddr *src_addr, | |
59 | struct rdma_dev_addr *addr, void *context); | |
60 | unsigned long timeout; | |
61 | int status; | |
62 | }; | |
63 | ||
c4028958 | 64 | static void process_req(struct work_struct *work); |
7025fcd3 SH |
65 | |
66 | static DEFINE_MUTEX(lock); | |
67 | static LIST_HEAD(req_list); | |
c4028958 | 68 | static DECLARE_DELAYED_WORK(work, process_req); |
7025fcd3 SH |
69 | static struct workqueue_struct *addr_wq; |
70 | ||
7a118df3 SH |
71 | void rdma_addr_register_client(struct rdma_addr_client *client) |
72 | { | |
73 | atomic_set(&client->refcount, 1); | |
74 | init_completion(&client->comp); | |
75 | } | |
76 | EXPORT_SYMBOL(rdma_addr_register_client); | |
77 | ||
78 | static inline void put_client(struct rdma_addr_client *client) | |
79 | { | |
80 | if (atomic_dec_and_test(&client->refcount)) | |
81 | complete(&client->comp); | |
82 | } | |
83 | ||
84 | void rdma_addr_unregister_client(struct rdma_addr_client *client) | |
85 | { | |
86 | put_client(client); | |
87 | wait_for_completion(&client->comp); | |
88 | } | |
89 | EXPORT_SYMBOL(rdma_addr_unregister_client); | |
90 | ||
07ebafba TT |
91 | int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev, |
92 | const unsigned char *dst_dev_addr) | |
7025fcd3 | 93 | { |
c4315d85 | 94 | dev_addr->dev_type = dev->type; |
7025fcd3 SH |
95 | memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN); |
96 | memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN); | |
97 | if (dst_dev_addr) | |
98 | memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN); | |
6266ed6e | 99 | dev_addr->bound_dev_if = dev->ifindex; |
7025fcd3 SH |
100 | return 0; |
101 | } | |
07ebafba | 102 | EXPORT_SYMBOL(rdma_copy_addr); |
7025fcd3 SH |
103 | |
104 | int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr) | |
105 | { | |
106 | struct net_device *dev; | |
38617c64 | 107 | int ret = -EADDRNOTAVAIL; |
7025fcd3 | 108 | |
6266ed6e SH |
109 | if (dev_addr->bound_dev_if) { |
110 | dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if); | |
111 | if (!dev) | |
112 | return -ENODEV; | |
113 | ret = rdma_copy_addr(dev_addr, dev, NULL); | |
114 | dev_put(dev); | |
115 | return ret; | |
116 | } | |
117 | ||
38617c64 AS |
118 | switch (addr->sa_family) { |
119 | case AF_INET: | |
120 | dev = ip_dev_find(&init_net, | |
121 | ((struct sockaddr_in *) addr)->sin_addr.s_addr); | |
122 | ||
123 | if (!dev) | |
124 | return ret; | |
7025fcd3 | 125 | |
38617c64 AS |
126 | ret = rdma_copy_addr(dev_addr, dev, NULL); |
127 | dev_put(dev); | |
128 | break; | |
2c4ab624 RD |
129 | |
130 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
38617c64 | 131 | case AF_INET6: |
0f9ea5d2 | 132 | read_lock(&dev_base_lock); |
38617c64 AS |
133 | for_each_netdev(&init_net, dev) { |
134 | if (ipv6_chk_addr(&init_net, | |
135 | &((struct sockaddr_in6 *) addr)->sin6_addr, | |
136 | dev, 1)) { | |
137 | ret = rdma_copy_addr(dev_addr, dev, NULL); | |
138 | break; | |
139 | } | |
140 | } | |
0f9ea5d2 | 141 | read_unlock(&dev_base_lock); |
38617c64 | 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 | ||
923c100e SH |
179 | static int addr4_resolve(struct sockaddr_in *src_in, |
180 | struct sockaddr_in *dst_in, | |
181 | struct rdma_dev_addr *addr) | |
7025fcd3 | 182 | { |
1b90c137 AV |
183 | __be32 src_ip = src_in->sin_addr.s_addr; |
184 | __be32 dst_ip = dst_in->sin_addr.s_addr; | |
7025fcd3 SH |
185 | struct flowi fl; |
186 | struct rtable *rt; | |
187 | struct neighbour *neigh; | |
188 | int ret; | |
189 | ||
190 | memset(&fl, 0, sizeof fl); | |
191 | fl.nl_u.ip4_u.daddr = dst_ip; | |
192 | fl.nl_u.ip4_u.saddr = src_ip; | |
6266ed6e SH |
193 | fl.oif = addr->bound_dev_if; |
194 | ||
f206351a | 195 | ret = ip_route_output_key(&init_net, &rt, &fl); |
7025fcd3 SH |
196 | if (ret) |
197 | goto out; | |
198 | ||
923c100e SH |
199 | src_in->sin_family = AF_INET; |
200 | src_in->sin_addr.s_addr = rt->rt_src; | |
201 | ||
202 | if (rt->idev->dev->flags & IFF_LOOPBACK) { | |
203 | ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); | |
204 | if (!ret) | |
205 | memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); | |
206 | goto put; | |
207 | } | |
208 | ||
7025fcd3 SH |
209 | /* If the device does ARP internally, return 'done' */ |
210 | if (rt->idev->dev->flags & IFF_NOARP) { | |
07ebafba | 211 | rdma_copy_addr(addr, rt->idev->dev, NULL); |
7025fcd3 SH |
212 | goto put; |
213 | } | |
214 | ||
215 | neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev); | |
923c100e SH |
216 | if (!neigh || !(neigh->nud_state & NUD_VALID)) { |
217 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
7025fcd3 | 218 | ret = -ENODATA; |
923c100e SH |
219 | if (neigh) |
220 | goto release; | |
7025fcd3 SH |
221 | goto put; |
222 | } | |
223 | ||
07ebafba | 224 | ret = rdma_copy_addr(addr, neigh->dev, neigh->ha); |
7025fcd3 SH |
225 | release: |
226 | neigh_release(neigh); | |
227 | put: | |
228 | ip_rt_put(rt); | |
229 | out: | |
230 | return ret; | |
231 | } | |
232 | ||
2c4ab624 | 233 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
d14714df SH |
234 | static int addr6_resolve(struct sockaddr_in6 *src_in, |
235 | struct sockaddr_in6 *dst_in, | |
236 | struct rdma_dev_addr *addr) | |
38617c64 AS |
237 | { |
238 | struct flowi fl; | |
239 | struct neighbour *neigh; | |
240 | struct dst_entry *dst; | |
d14714df | 241 | int ret; |
38617c64 AS |
242 | |
243 | memset(&fl, 0, sizeof fl); | |
d14714df SH |
244 | ipv6_addr_copy(&fl.fl6_dst, &dst_in->sin6_addr); |
245 | ipv6_addr_copy(&fl.fl6_src, &src_in->sin6_addr); | |
6266ed6e | 246 | fl.oif = addr->bound_dev_if; |
38617c64 AS |
247 | |
248 | dst = ip6_route_output(&init_net, NULL, &fl); | |
d14714df SH |
249 | if ((ret = dst->error)) |
250 | goto put; | |
251 | ||
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); | |
255 | if (ret) | |
256 | goto put; | |
38617c64 | 257 | |
d14714df SH |
258 | src_in->sin6_family = AF_INET6; |
259 | ipv6_addr_copy(&src_in->sin6_addr, &fl.fl6_src); | |
260 | } | |
261 | ||
262 | if (dst->dev->flags & IFF_LOOPBACK) { | |
263 | ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); | |
264 | if (!ret) | |
265 | memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); | |
266 | goto put; | |
267 | } | |
268 | ||
269 | /* If the device does ARP internally, return 'done' */ | |
38617c64 AS |
270 | if (dst->dev->flags & IFF_NOARP) { |
271 | ret = rdma_copy_addr(addr, dst->dev, NULL); | |
d14714df | 272 | goto put; |
38617c64 AS |
273 | } |
274 | ||
d14714df SH |
275 | neigh = dst->neighbour; |
276 | if (!neigh || !(neigh->nud_state & NUD_VALID)) { | |
277 | neigh_event_send(dst->neighbour, NULL); | |
278 | ret = -ENODATA; | |
279 | goto put; | |
280 | } | |
281 | ||
282 | ret = rdma_copy_addr(addr, dst->dev, neigh->ha); | |
283 | put: | |
38617c64 AS |
284 | dst_release(dst); |
285 | return ret; | |
286 | } | |
2c4ab624 | 287 | #else |
d14714df SH |
288 | static int addr6_resolve(struct sockaddr_in6 *src_in, |
289 | struct sockaddr_in6 *dst_in, | |
290 | struct rdma_dev_addr *addr) | |
2c4ab624 RD |
291 | { |
292 | return -EADDRNOTAVAIL; | |
293 | } | |
294 | #endif | |
38617c64 | 295 | |
923c100e SH |
296 | static int addr_resolve(struct sockaddr *src_in, |
297 | struct sockaddr *dst_in, | |
298 | struct rdma_dev_addr *addr) | |
38617c64 AS |
299 | { |
300 | if (src_in->sa_family == AF_INET) { | |
923c100e | 301 | return addr4_resolve((struct sockaddr_in *) src_in, |
38617c64 AS |
302 | (struct sockaddr_in *) dst_in, addr); |
303 | } else | |
d14714df | 304 | return addr6_resolve((struct sockaddr_in6 *) src_in, |
38617c64 AS |
305 | (struct sockaddr_in6 *) dst_in, addr); |
306 | } | |
307 | ||
c4028958 | 308 | static void process_req(struct work_struct *work) |
7025fcd3 SH |
309 | { |
310 | struct addr_req *req, *temp_req; | |
38617c64 | 311 | struct sockaddr *src_in, *dst_in; |
7025fcd3 SH |
312 | struct list_head done_list; |
313 | ||
314 | INIT_LIST_HEAD(&done_list); | |
315 | ||
316 | mutex_lock(&lock); | |
317 | list_for_each_entry_safe(req, temp_req, &req_list, list) { | |
c78bb844 | 318 | if (req->status == -ENODATA) { |
38617c64 AS |
319 | src_in = (struct sockaddr *) &req->src_addr; |
320 | dst_in = (struct sockaddr *) &req->dst_addr; | |
923c100e | 321 | req->status = addr_resolve(src_in, dst_in, req->addr); |
c78bb844 KK |
322 | if (req->status && time_after_eq(jiffies, req->timeout)) |
323 | req->status = -ETIMEDOUT; | |
324 | else if (req->status == -ENODATA) | |
325 | continue; | |
7025fcd3 | 326 | } |
04699a1f | 327 | list_move_tail(&req->list, &done_list); |
7025fcd3 SH |
328 | } |
329 | ||
330 | if (!list_empty(&req_list)) { | |
331 | req = list_entry(req_list.next, struct addr_req, list); | |
332 | set_timeout(req->timeout); | |
333 | } | |
334 | mutex_unlock(&lock); | |
335 | ||
336 | list_for_each_entry_safe(req, temp_req, &done_list, list) { | |
337 | list_del(&req->list); | |
38617c64 AS |
338 | req->callback(req->status, (struct sockaddr *) &req->src_addr, |
339 | req->addr, req->context); | |
7a118df3 | 340 | put_client(req->client); |
7025fcd3 SH |
341 | kfree(req); |
342 | } | |
343 | } | |
344 | ||
7a118df3 SH |
345 | int rdma_resolve_ip(struct rdma_addr_client *client, |
346 | struct sockaddr *src_addr, struct sockaddr *dst_addr, | |
7025fcd3 SH |
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), | |
350 | void *context) | |
351 | { | |
38617c64 | 352 | struct sockaddr *src_in, *dst_in; |
7025fcd3 SH |
353 | struct addr_req *req; |
354 | int ret = 0; | |
355 | ||
dd00cc48 | 356 | req = kzalloc(sizeof *req, GFP_KERNEL); |
7025fcd3 SH |
357 | if (!req) |
358 | return -ENOMEM; | |
7025fcd3 | 359 | |
d2e08862 SH |
360 | src_in = (struct sockaddr *) &req->src_addr; |
361 | dst_in = (struct sockaddr *) &req->dst_addr; | |
362 | ||
363 | if (src_addr) { | |
364 | if (src_addr->sa_family != dst_addr->sa_family) { | |
365 | ret = -EINVAL; | |
366 | goto err; | |
367 | } | |
368 | ||
369 | memcpy(src_in, src_addr, ip_addr_size(src_addr)); | |
370 | } else { | |
371 | src_in->sa_family = dst_addr->sa_family; | |
372 | } | |
373 | ||
374 | memcpy(dst_in, dst_addr, ip_addr_size(dst_addr)); | |
7025fcd3 SH |
375 | req->addr = addr; |
376 | req->callback = callback; | |
377 | req->context = context; | |
7a118df3 SH |
378 | req->client = client; |
379 | atomic_inc(&client->refcount); | |
7025fcd3 | 380 | |
d14714df | 381 | req->status = addr_resolve(src_in, dst_in, addr); |
7025fcd3 SH |
382 | switch (req->status) { |
383 | case 0: | |
384 | req->timeout = jiffies; | |
385 | queue_req(req); | |
386 | break; | |
387 | case -ENODATA: | |
388 | req->timeout = msecs_to_jiffies(timeout_ms) + jiffies; | |
389 | queue_req(req); | |
7025fcd3 SH |
390 | break; |
391 | default: | |
392 | ret = req->status; | |
7a118df3 | 393 | atomic_dec(&client->refcount); |
d2e08862 | 394 | goto err; |
7025fcd3 SH |
395 | } |
396 | return ret; | |
d2e08862 SH |
397 | err: |
398 | kfree(req); | |
399 | return ret; | |
7025fcd3 SH |
400 | } |
401 | EXPORT_SYMBOL(rdma_resolve_ip); | |
402 | ||
403 | void rdma_addr_cancel(struct rdma_dev_addr *addr) | |
404 | { | |
405 | struct addr_req *req, *temp_req; | |
406 | ||
407 | mutex_lock(&lock); | |
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; | |
04699a1f | 412 | list_move(&req->list, &req_list); |
7025fcd3 SH |
413 | set_timeout(req->timeout); |
414 | break; | |
415 | } | |
416 | } | |
417 | mutex_unlock(&lock); | |
418 | } | |
419 | EXPORT_SYMBOL(rdma_addr_cancel); | |
420 | ||
3cd96564 | 421 | static int netevent_callback(struct notifier_block *self, unsigned long event, |
e795d092 | 422 | void *ctx) |
7025fcd3 | 423 | { |
3cd96564 | 424 | if (event == NETEVENT_NEIGH_UPDATE) { |
e795d092 | 425 | struct neighbour *neigh = ctx; |
7025fcd3 | 426 | |
1f126670 | 427 | if (neigh->nud_state & NUD_VALID) { |
e795d092 TT |
428 | set_timeout(jiffies); |
429 | } | |
430 | } | |
7025fcd3 SH |
431 | return 0; |
432 | } | |
433 | ||
e795d092 TT |
434 | static struct notifier_block nb = { |
435 | .notifier_call = netevent_callback | |
7025fcd3 SH |
436 | }; |
437 | ||
716abb1f | 438 | static int __init addr_init(void) |
7025fcd3 | 439 | { |
c7f743a6 | 440 | addr_wq = create_singlethread_workqueue("ib_addr"); |
7025fcd3 SH |
441 | if (!addr_wq) |
442 | return -ENOMEM; | |
443 | ||
e795d092 | 444 | register_netevent_notifier(&nb); |
7025fcd3 SH |
445 | return 0; |
446 | } | |
447 | ||
716abb1f | 448 | static void __exit addr_cleanup(void) |
7025fcd3 | 449 | { |
e795d092 | 450 | unregister_netevent_notifier(&nb); |
7025fcd3 SH |
451 | destroy_workqueue(addr_wq); |
452 | } | |
453 | ||
454 | module_init(addr_init); | |
455 | module_exit(addr_cleanup); |