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> | |
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> |
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; |
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; |
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, |
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; |
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 | |
131 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
38617c64 | 132 | case AF_INET6: |
0f9ea5d2 | 133 | read_lock(&dev_base_lock); |
38617c64 AS |
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 | } | |
0f9ea5d2 | 142 | read_unlock(&dev_base_lock); |
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; |
185 | __be32 dst_ip = dst_in->sin_addr.s_addr; | |
7025fcd3 SH |
186 | struct flowi fl; |
187 | struct rtable *rt; | |
188 | struct neighbour *neigh; | |
189 | int ret; | |
190 | ||
191 | memset(&fl, 0, sizeof fl); | |
192 | fl.nl_u.ip4_u.daddr = dst_ip; | |
193 | fl.nl_u.ip4_u.saddr = src_ip; | |
6266ed6e SH |
194 | fl.oif = addr->bound_dev_if; |
195 | ||
f206351a | 196 | ret = ip_route_output_key(&init_net, &rt, &fl); |
7025fcd3 SH |
197 | if (ret) |
198 | goto out; | |
199 | ||
923c100e SH |
200 | src_in->sin_family = AF_INET; |
201 | src_in->sin_addr.s_addr = rt->rt_src; | |
202 | ||
203 | if (rt->idev->dev->flags & IFF_LOOPBACK) { | |
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 SH |
210 | /* If the device does ARP internally, return 'done' */ |
211 | if (rt->idev->dev->flags & IFF_NOARP) { | |
07ebafba | 212 | rdma_copy_addr(addr, rt->idev->dev, NULL); |
7025fcd3 SH |
213 | goto put; |
214 | } | |
215 | ||
216 | neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev); | |
923c100e SH |
217 | if (!neigh || !(neigh->nud_state & NUD_VALID)) { |
218 | neigh_event_send(rt->u.dst.neighbour, NULL); | |
7025fcd3 | 219 | ret = -ENODATA; |
923c100e SH |
220 | if (neigh) |
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 AS |
238 | { |
239 | struct flowi fl; | |
240 | struct neighbour *neigh; | |
241 | struct dst_entry *dst; | |
d14714df | 242 | int ret; |
38617c64 AS |
243 | |
244 | memset(&fl, 0, sizeof fl); | |
d14714df SH |
245 | ipv6_addr_copy(&fl.fl6_dst, &dst_in->sin6_addr); |
246 | ipv6_addr_copy(&fl.fl6_src, &src_in->sin6_addr); | |
6266ed6e | 247 | fl.oif = addr->bound_dev_if; |
38617c64 AS |
248 | |
249 | dst = ip6_route_output(&init_net, NULL, &fl); | |
d14714df SH |
250 | if ((ret = dst->error)) |
251 | goto put; | |
252 | ||
253 | if (ipv6_addr_any(&fl.fl6_src)) { | |
254 | ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev, | |
255 | &fl.fl6_dst, 0, &fl.fl6_src); | |
256 | if (ret) | |
257 | goto put; | |
38617c64 | 258 | |
d14714df SH |
259 | src_in->sin6_family = AF_INET6; |
260 | ipv6_addr_copy(&src_in->sin6_addr, &fl.fl6_src); | |
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) { |
272 | ret = rdma_copy_addr(addr, dst->dev, NULL); | |
d14714df | 273 | goto put; |
38617c64 AS |
274 | } |
275 | ||
d14714df SH |
276 | neigh = dst->neighbour; |
277 | if (!neigh || !(neigh->nud_state & NUD_VALID)) { | |
278 | neigh_event_send(dst->neighbour, NULL); | |
279 | ret = -ENODATA; | |
280 | goto put; | |
281 | } | |
282 | ||
283 | ret = rdma_copy_addr(addr, dst->dev, neigh->ha); | |
284 | put: | |
38617c64 AS |
285 | dst_release(dst); |
286 | return ret; | |
287 | } | |
2c4ab624 | 288 | #else |
d14714df SH |
289 | static int addr6_resolve(struct sockaddr_in6 *src_in, |
290 | struct sockaddr_in6 *dst_in, | |
291 | struct rdma_dev_addr *addr) | |
2c4ab624 RD |
292 | { |
293 | return -EADDRNOTAVAIL; | |
294 | } | |
295 | #endif | |
38617c64 | 296 | |
923c100e SH |
297 | static int addr_resolve(struct sockaddr *src_in, |
298 | struct sockaddr *dst_in, | |
299 | struct rdma_dev_addr *addr) | |
38617c64 AS |
300 | { |
301 | if (src_in->sa_family == AF_INET) { | |
923c100e | 302 | return addr4_resolve((struct sockaddr_in *) src_in, |
38617c64 AS |
303 | (struct sockaddr_in *) dst_in, addr); |
304 | } else | |
d14714df | 305 | return addr6_resolve((struct sockaddr_in6 *) src_in, |
38617c64 AS |
306 | (struct sockaddr_in6 *) dst_in, addr); |
307 | } | |
308 | ||
c4028958 | 309 | static void process_req(struct work_struct *work) |
7025fcd3 SH |
310 | { |
311 | struct addr_req *req, *temp_req; | |
38617c64 | 312 | struct sockaddr *src_in, *dst_in; |
7025fcd3 SH |
313 | struct list_head done_list; |
314 | ||
315 | INIT_LIST_HEAD(&done_list); | |
316 | ||
317 | mutex_lock(&lock); | |
318 | list_for_each_entry_safe(req, temp_req, &req_list, list) { | |
c78bb844 | 319 | if (req->status == -ENODATA) { |
38617c64 AS |
320 | src_in = (struct sockaddr *) &req->src_addr; |
321 | dst_in = (struct sockaddr *) &req->dst_addr; | |
923c100e | 322 | req->status = addr_resolve(src_in, dst_in, req->addr); |
c78bb844 KK |
323 | if (req->status && time_after_eq(jiffies, req->timeout)) |
324 | req->status = -ETIMEDOUT; | |
325 | else if (req->status == -ENODATA) | |
326 | continue; | |
7025fcd3 | 327 | } |
04699a1f | 328 | list_move_tail(&req->list, &done_list); |
7025fcd3 SH |
329 | } |
330 | ||
331 | if (!list_empty(&req_list)) { | |
332 | req = list_entry(req_list.next, struct addr_req, list); | |
333 | set_timeout(req->timeout); | |
334 | } | |
335 | mutex_unlock(&lock); | |
336 | ||
337 | list_for_each_entry_safe(req, temp_req, &done_list, list) { | |
338 | list_del(&req->list); | |
38617c64 AS |
339 | req->callback(req->status, (struct sockaddr *) &req->src_addr, |
340 | req->addr, req->context); | |
7a118df3 | 341 | put_client(req->client); |
7025fcd3 SH |
342 | kfree(req); |
343 | } | |
344 | } | |
345 | ||
7a118df3 SH |
346 | int rdma_resolve_ip(struct rdma_addr_client *client, |
347 | struct sockaddr *src_addr, struct sockaddr *dst_addr, | |
7025fcd3 SH |
348 | struct rdma_dev_addr *addr, int timeout_ms, |
349 | void (*callback)(int status, struct sockaddr *src_addr, | |
350 | struct rdma_dev_addr *addr, void *context), | |
351 | void *context) | |
352 | { | |
38617c64 | 353 | struct sockaddr *src_in, *dst_in; |
7025fcd3 SH |
354 | struct addr_req *req; |
355 | int ret = 0; | |
356 | ||
dd00cc48 | 357 | req = kzalloc(sizeof *req, GFP_KERNEL); |
7025fcd3 SH |
358 | if (!req) |
359 | return -ENOMEM; | |
7025fcd3 | 360 | |
d2e08862 SH |
361 | src_in = (struct sockaddr *) &req->src_addr; |
362 | dst_in = (struct sockaddr *) &req->dst_addr; | |
363 | ||
364 | if (src_addr) { | |
365 | if (src_addr->sa_family != dst_addr->sa_family) { | |
366 | ret = -EINVAL; | |
367 | goto err; | |
368 | } | |
369 | ||
370 | memcpy(src_in, src_addr, ip_addr_size(src_addr)); | |
371 | } else { | |
372 | src_in->sa_family = dst_addr->sa_family; | |
373 | } | |
374 | ||
375 | memcpy(dst_in, dst_addr, ip_addr_size(dst_addr)); | |
7025fcd3 SH |
376 | req->addr = addr; |
377 | req->callback = callback; | |
378 | req->context = context; | |
7a118df3 SH |
379 | req->client = client; |
380 | atomic_inc(&client->refcount); | |
7025fcd3 | 381 | |
d14714df | 382 | req->status = addr_resolve(src_in, dst_in, addr); |
7025fcd3 SH |
383 | switch (req->status) { |
384 | case 0: | |
385 | req->timeout = jiffies; | |
386 | queue_req(req); | |
387 | break; | |
388 | case -ENODATA: | |
389 | req->timeout = msecs_to_jiffies(timeout_ms) + jiffies; | |
390 | queue_req(req); | |
7025fcd3 SH |
391 | break; |
392 | default: | |
393 | ret = req->status; | |
7a118df3 | 394 | atomic_dec(&client->refcount); |
d2e08862 | 395 | goto err; |
7025fcd3 SH |
396 | } |
397 | return ret; | |
d2e08862 SH |
398 | err: |
399 | kfree(req); | |
400 | return ret; | |
7025fcd3 SH |
401 | } |
402 | EXPORT_SYMBOL(rdma_resolve_ip); | |
403 | ||
404 | void rdma_addr_cancel(struct rdma_dev_addr *addr) | |
405 | { | |
406 | struct addr_req *req, *temp_req; | |
407 | ||
408 | mutex_lock(&lock); | |
409 | list_for_each_entry_safe(req, temp_req, &req_list, list) { | |
410 | if (req->addr == addr) { | |
411 | req->status = -ECANCELED; | |
412 | req->timeout = jiffies; | |
04699a1f | 413 | list_move(&req->list, &req_list); |
7025fcd3 SH |
414 | set_timeout(req->timeout); |
415 | break; | |
416 | } | |
417 | } | |
418 | mutex_unlock(&lock); | |
419 | } | |
420 | EXPORT_SYMBOL(rdma_addr_cancel); | |
421 | ||
3cd96564 | 422 | static int netevent_callback(struct notifier_block *self, unsigned long event, |
e795d092 | 423 | void *ctx) |
7025fcd3 | 424 | { |
3cd96564 | 425 | if (event == NETEVENT_NEIGH_UPDATE) { |
e795d092 | 426 | struct neighbour *neigh = ctx; |
7025fcd3 | 427 | |
1f126670 | 428 | if (neigh->nud_state & NUD_VALID) { |
e795d092 TT |
429 | set_timeout(jiffies); |
430 | } | |
431 | } | |
7025fcd3 SH |
432 | return 0; |
433 | } | |
434 | ||
e795d092 TT |
435 | static struct notifier_block nb = { |
436 | .notifier_call = netevent_callback | |
7025fcd3 SH |
437 | }; |
438 | ||
716abb1f | 439 | static int __init addr_init(void) |
7025fcd3 | 440 | { |
c7f743a6 | 441 | addr_wq = create_singlethread_workqueue("ib_addr"); |
7025fcd3 SH |
442 | if (!addr_wq) |
443 | return -ENOMEM; | |
444 | ||
e795d092 | 445 | register_netevent_notifier(&nb); |
7025fcd3 SH |
446 | return 0; |
447 | } | |
448 | ||
716abb1f | 449 | static void __exit addr_cleanup(void) |
7025fcd3 | 450 | { |
e795d092 | 451 | unregister_netevent_notifier(&nb); |
7025fcd3 SH |
452 | destroy_workqueue(addr_wq); |
453 | } | |
454 | ||
455 | module_init(addr_init); | |
456 | module_exit(addr_cleanup); |