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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 <net/arp.h>
41#include <net/neighbour.h>
42#include <net/route.h>
43#include <net/netevent.h>
44#include <net/addrconf.h>
45#include <net/ip6_route.h>
46#include <rdma/ib_addr.h>
47
48MODULE_AUTHOR("Sean Hefty");
49MODULE_DESCRIPTION("IB Address Translation");
50MODULE_LICENSE("Dual BSD/GPL");
51
52struct addr_req {
53 struct list_head list;
54 struct sockaddr_storage src_addr;
55 struct sockaddr_storage dst_addr;
56 struct rdma_dev_addr *addr;
57 struct rdma_addr_client *client;
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
65static void process_req(struct work_struct *work);
66
67static DEFINE_MUTEX(lock);
68static LIST_HEAD(req_list);
69static DECLARE_DELAYED_WORK(work, process_req);
70static struct workqueue_struct *addr_wq;
71
72void rdma_addr_register_client(struct rdma_addr_client *client)
73{
74 atomic_set(&client->refcount, 1);
75 init_completion(&client->comp);
76}
77EXPORT_SYMBOL(rdma_addr_register_client);
78
79static inline void put_client(struct rdma_addr_client *client)
80{
81 if (atomic_dec_and_test(&client->refcount))
82 complete(&client->comp);
83}
84
85void rdma_addr_unregister_client(struct rdma_addr_client *client)
86{
87 put_client(client);
88 wait_for_completion(&client->comp);
89}
90EXPORT_SYMBOL(rdma_addr_unregister_client);
91
92int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
93 const unsigned char *dst_dev_addr)
94{
95 dev_addr->dev_type = dev->type;
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);
100 dev_addr->bound_dev_if = dev->ifindex;
101 return 0;
102}
103EXPORT_SYMBOL(rdma_copy_addr);
104
105int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
106{
107 struct net_device *dev;
108 int ret = -EADDRNOTAVAIL;
109
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
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;
126
127 ret = rdma_copy_addr(dev_addr, dev, NULL);
128 dev_put(dev);
129 break;
130
131#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132 case AF_INET6:
133 rcu_read_lock();
134 for_each_netdev_rcu(&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 rcu_read_unlock();
143 break;
144#endif
145 }
146 return ret;
147}
148EXPORT_SYMBOL(rdma_translate_ip);
149
150static 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
163static 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) {
169 if (time_after_eq(req->timeout, temp_req->timeout))
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
180static int addr4_resolve(struct sockaddr_in *src_in,
181 struct sockaddr_in *dst_in,
182 struct rdma_dev_addr *addr)
183{
184 __be32 src_ip = src_in->sin_addr.s_addr;
185 __be32 dst_ip = dst_in->sin_addr.s_addr;
186 struct rtable *rt;
187 struct neighbour *neigh;
188 struct flowi4 fl4;
189 int ret;
190
191 memset(&fl4, 0, sizeof(fl4));
192 fl4.daddr = dst_ip;
193 fl4.saddr = src_ip;
194 fl4.flowi4_oif = addr->bound_dev_if;
195 rt = ip_route_output_key(&init_net, &fl4);
196 if (IS_ERR(rt)) {
197 ret = PTR_ERR(rt);
198 goto out;
199 }
200 src_in->sin_family = AF_INET;
201 src_in->sin_addr.s_addr = fl4.saddr;
202
203 if (rt->dst.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
210 /* If the device does ARP internally, return 'done' */
211 if (rt->dst.dev->flags & IFF_NOARP) {
212 ret = rdma_copy_addr(addr, rt->dst.dev, NULL);
213 goto put;
214 }
215
216 neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->dst.dev);
217 if (!neigh || !(neigh->nud_state & NUD_VALID)) {
218 neigh_event_send(dst_get_neighbour(&rt->dst), NULL);
219 ret = -ENODATA;
220 if (neigh)
221 goto release;
222 goto put;
223 }
224
225 ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
226release:
227 neigh_release(neigh);
228put:
229 ip_rt_put(rt);
230out:
231 return ret;
232}
233
234#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
235static int addr6_resolve(struct sockaddr_in6 *src_in,
236 struct sockaddr_in6 *dst_in,
237 struct rdma_dev_addr *addr)
238{
239 struct flowi6 fl6;
240 struct neighbour *neigh;
241 struct dst_entry *dst;
242 int ret;
243
244 memset(&fl6, 0, sizeof fl6);
245 ipv6_addr_copy(&fl6.daddr, &dst_in->sin6_addr);
246 ipv6_addr_copy(&fl6.saddr, &src_in->sin6_addr);
247 fl6.flowi6_oif = addr->bound_dev_if;
248
249 dst = ip6_route_output(&init_net, NULL, &fl6);
250 if ((ret = dst->error))
251 goto put;
252
253 if (ipv6_addr_any(&fl6.saddr)) {
254 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
255 &fl6.daddr, 0, &fl6.saddr);
256 if (ret)
257 goto put;
258
259 src_in->sin6_family = AF_INET6;
260 ipv6_addr_copy(&src_in->sin6_addr, &fl6.saddr);
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' */
271 if (dst->dev->flags & IFF_NOARP) {
272 ret = rdma_copy_addr(addr, dst->dev, NULL);
273 goto put;
274 }
275
276 neigh = dst_get_neighbour(dst);
277 if (!neigh || !(neigh->nud_state & NUD_VALID)) {
278 if (neigh)
279 neigh_event_send(neigh, NULL);
280 ret = -ENODATA;
281 goto put;
282 }
283
284 ret = rdma_copy_addr(addr, dst->dev, neigh->ha);
285put:
286 dst_release(dst);
287 return ret;
288}
289#else
290static int addr6_resolve(struct sockaddr_in6 *src_in,
291 struct sockaddr_in6 *dst_in,
292 struct rdma_dev_addr *addr)
293{
294 return -EADDRNOTAVAIL;
295}
296#endif
297
298static int addr_resolve(struct sockaddr *src_in,
299 struct sockaddr *dst_in,
300 struct rdma_dev_addr *addr)
301{
302 if (src_in->sa_family == AF_INET) {
303 return addr4_resolve((struct sockaddr_in *) src_in,
304 (struct sockaddr_in *) dst_in, addr);
305 } else
306 return addr6_resolve((struct sockaddr_in6 *) src_in,
307 (struct sockaddr_in6 *) dst_in, addr);
308}
309
310static void process_req(struct work_struct *work)
311{
312 struct addr_req *req, *temp_req;
313 struct sockaddr *src_in, *dst_in;
314 struct list_head done_list;
315
316 INIT_LIST_HEAD(&done_list);
317
318 mutex_lock(&lock);
319 list_for_each_entry_safe(req, temp_req, &req_list, list) {
320 if (req->status == -ENODATA) {
321 src_in = (struct sockaddr *) &req->src_addr;
322 dst_in = (struct sockaddr *) &req->dst_addr;
323 req->status = addr_resolve(src_in, dst_in, req->addr);
324 if (req->status && time_after_eq(jiffies, req->timeout))
325 req->status = -ETIMEDOUT;
326 else if (req->status == -ENODATA)
327 continue;
328 }
329 list_move_tail(&req->list, &done_list);
330 }
331
332 if (!list_empty(&req_list)) {
333 req = list_entry(req_list.next, struct addr_req, list);
334 set_timeout(req->timeout);
335 }
336 mutex_unlock(&lock);
337
338 list_for_each_entry_safe(req, temp_req, &done_list, list) {
339 list_del(&req->list);
340 req->callback(req->status, (struct sockaddr *) &req->src_addr,
341 req->addr, req->context);
342 put_client(req->client);
343 kfree(req);
344 }
345}
346
347int rdma_resolve_ip(struct rdma_addr_client *client,
348 struct sockaddr *src_addr, struct sockaddr *dst_addr,
349 struct rdma_dev_addr *addr, int timeout_ms,
350 void (*callback)(int status, struct sockaddr *src_addr,
351 struct rdma_dev_addr *addr, void *context),
352 void *context)
353{
354 struct sockaddr *src_in, *dst_in;
355 struct addr_req *req;
356 int ret = 0;
357
358 req = kzalloc(sizeof *req, GFP_KERNEL);
359 if (!req)
360 return -ENOMEM;
361
362 src_in = (struct sockaddr *) &req->src_addr;
363 dst_in = (struct sockaddr *) &req->dst_addr;
364
365 if (src_addr) {
366 if (src_addr->sa_family != dst_addr->sa_family) {
367 ret = -EINVAL;
368 goto err;
369 }
370
371 memcpy(src_in, src_addr, ip_addr_size(src_addr));
372 } else {
373 src_in->sa_family = dst_addr->sa_family;
374 }
375
376 memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
377 req->addr = addr;
378 req->callback = callback;
379 req->context = context;
380 req->client = client;
381 atomic_inc(&client->refcount);
382
383 req->status = addr_resolve(src_in, dst_in, addr);
384 switch (req->status) {
385 case 0:
386 req->timeout = jiffies;
387 queue_req(req);
388 break;
389 case -ENODATA:
390 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
391 queue_req(req);
392 break;
393 default:
394 ret = req->status;
395 atomic_dec(&client->refcount);
396 goto err;
397 }
398 return ret;
399err:
400 kfree(req);
401 return ret;
402}
403EXPORT_SYMBOL(rdma_resolve_ip);
404
405void rdma_addr_cancel(struct rdma_dev_addr *addr)
406{
407 struct addr_req *req, *temp_req;
408
409 mutex_lock(&lock);
410 list_for_each_entry_safe(req, temp_req, &req_list, list) {
411 if (req->addr == addr) {
412 req->status = -ECANCELED;
413 req->timeout = jiffies;
414 list_move(&req->list, &req_list);
415 set_timeout(req->timeout);
416 break;
417 }
418 }
419 mutex_unlock(&lock);
420}
421EXPORT_SYMBOL(rdma_addr_cancel);
422
423static int netevent_callback(struct notifier_block *self, unsigned long event,
424 void *ctx)
425{
426 if (event == NETEVENT_NEIGH_UPDATE) {
427 struct neighbour *neigh = ctx;
428
429 if (neigh->nud_state & NUD_VALID) {
430 set_timeout(jiffies);
431 }
432 }
433 return 0;
434}
435
436static struct notifier_block nb = {
437 .notifier_call = netevent_callback
438};
439
440static int __init addr_init(void)
441{
442 addr_wq = create_singlethread_workqueue("ib_addr");
443 if (!addr_wq)
444 return -ENOMEM;
445
446 register_netevent_notifier(&nb);
447 return 0;
448}
449
450static void __exit addr_cleanup(void)
451{
452 unregister_netevent_notifier(&nb);
453 destroy_workqueue(addr_wq);
454}
455
456module_init(addr_init);
457module_exit(addr_cleanup);
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#include <rdma/ib.h>
49
50MODULE_AUTHOR("Sean Hefty");
51MODULE_DESCRIPTION("IB Address Translation");
52MODULE_LICENSE("Dual BSD/GPL");
53
54struct addr_req {
55 struct list_head list;
56 struct sockaddr_storage src_addr;
57 struct sockaddr_storage dst_addr;
58 struct rdma_dev_addr *addr;
59 struct rdma_addr_client *client;
60 void *context;
61 void (*callback)(int status, struct sockaddr *src_addr,
62 struct rdma_dev_addr *addr, void *context);
63 unsigned long timeout;
64 int status;
65};
66
67static void process_req(struct work_struct *work);
68
69static DEFINE_MUTEX(lock);
70static LIST_HEAD(req_list);
71static DECLARE_DELAYED_WORK(work, process_req);
72static struct workqueue_struct *addr_wq;
73
74int rdma_addr_size(struct sockaddr *addr)
75{
76 switch (addr->sa_family) {
77 case AF_INET:
78 return sizeof(struct sockaddr_in);
79 case AF_INET6:
80 return sizeof(struct sockaddr_in6);
81 case AF_IB:
82 return sizeof(struct sockaddr_ib);
83 default:
84 return 0;
85 }
86}
87EXPORT_SYMBOL(rdma_addr_size);
88
89static struct rdma_addr_client self;
90
91void rdma_addr_register_client(struct rdma_addr_client *client)
92{
93 atomic_set(&client->refcount, 1);
94 init_completion(&client->comp);
95}
96EXPORT_SYMBOL(rdma_addr_register_client);
97
98static inline void put_client(struct rdma_addr_client *client)
99{
100 if (atomic_dec_and_test(&client->refcount))
101 complete(&client->comp);
102}
103
104void rdma_addr_unregister_client(struct rdma_addr_client *client)
105{
106 put_client(client);
107 wait_for_completion(&client->comp);
108}
109EXPORT_SYMBOL(rdma_addr_unregister_client);
110
111int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
112 const unsigned char *dst_dev_addr)
113{
114 dev_addr->dev_type = dev->type;
115 memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
116 memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
117 if (dst_dev_addr)
118 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
119 dev_addr->bound_dev_if = dev->ifindex;
120 return 0;
121}
122EXPORT_SYMBOL(rdma_copy_addr);
123
124int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
125 u16 *vlan_id)
126{
127 struct net_device *dev;
128 int ret = -EADDRNOTAVAIL;
129
130 if (dev_addr->bound_dev_if) {
131 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
132 if (!dev)
133 return -ENODEV;
134 ret = rdma_copy_addr(dev_addr, dev, NULL);
135 dev_put(dev);
136 return ret;
137 }
138
139 switch (addr->sa_family) {
140 case AF_INET:
141 dev = ip_dev_find(&init_net,
142 ((struct sockaddr_in *) addr)->sin_addr.s_addr);
143
144 if (!dev)
145 return ret;
146
147 ret = rdma_copy_addr(dev_addr, dev, NULL);
148 if (vlan_id)
149 *vlan_id = rdma_vlan_dev_vlan_id(dev);
150 dev_put(dev);
151 break;
152
153#if IS_ENABLED(CONFIG_IPV6)
154 case AF_INET6:
155 rcu_read_lock();
156 for_each_netdev_rcu(&init_net, dev) {
157 if (ipv6_chk_addr(&init_net,
158 &((struct sockaddr_in6 *) addr)->sin6_addr,
159 dev, 1)) {
160 ret = rdma_copy_addr(dev_addr, dev, NULL);
161 if (vlan_id)
162 *vlan_id = rdma_vlan_dev_vlan_id(dev);
163 break;
164 }
165 }
166 rcu_read_unlock();
167 break;
168#endif
169 }
170 return ret;
171}
172EXPORT_SYMBOL(rdma_translate_ip);
173
174static void set_timeout(unsigned long time)
175{
176 unsigned long delay;
177
178 delay = time - jiffies;
179 if ((long)delay <= 0)
180 delay = 1;
181
182 mod_delayed_work(addr_wq, &work, delay);
183}
184
185static void queue_req(struct addr_req *req)
186{
187 struct addr_req *temp_req;
188
189 mutex_lock(&lock);
190 list_for_each_entry_reverse(temp_req, &req_list, list) {
191 if (time_after_eq(req->timeout, temp_req->timeout))
192 break;
193 }
194
195 list_add(&req->list, &temp_req->list);
196
197 if (req_list.next == &req->list)
198 set_timeout(req->timeout);
199 mutex_unlock(&lock);
200}
201
202static int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr, void *daddr)
203{
204 struct neighbour *n;
205 int ret;
206
207 n = dst_neigh_lookup(dst, daddr);
208
209 rcu_read_lock();
210 if (!n || !(n->nud_state & NUD_VALID)) {
211 if (n)
212 neigh_event_send(n, NULL);
213 ret = -ENODATA;
214 } else {
215 ret = rdma_copy_addr(dev_addr, dst->dev, n->ha);
216 }
217 rcu_read_unlock();
218
219 if (n)
220 neigh_release(n);
221
222 return ret;
223}
224
225static int addr4_resolve(struct sockaddr_in *src_in,
226 struct sockaddr_in *dst_in,
227 struct rdma_dev_addr *addr)
228{
229 __be32 src_ip = src_in->sin_addr.s_addr;
230 __be32 dst_ip = dst_in->sin_addr.s_addr;
231 struct rtable *rt;
232 struct flowi4 fl4;
233 int ret;
234
235 memset(&fl4, 0, sizeof(fl4));
236 fl4.daddr = dst_ip;
237 fl4.saddr = src_ip;
238 fl4.flowi4_oif = addr->bound_dev_if;
239 rt = ip_route_output_key(&init_net, &fl4);
240 if (IS_ERR(rt)) {
241 ret = PTR_ERR(rt);
242 goto out;
243 }
244 src_in->sin_family = AF_INET;
245 src_in->sin_addr.s_addr = fl4.saddr;
246
247 if (rt->dst.dev->flags & IFF_LOOPBACK) {
248 ret = rdma_translate_ip((struct sockaddr *)dst_in, addr, NULL);
249 if (!ret)
250 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
251 goto put;
252 }
253
254 /* If the device does ARP internally, return 'done' */
255 if (rt->dst.dev->flags & IFF_NOARP) {
256 ret = rdma_copy_addr(addr, rt->dst.dev, NULL);
257 goto put;
258 }
259
260 ret = dst_fetch_ha(&rt->dst, addr, &fl4.daddr);
261put:
262 ip_rt_put(rt);
263out:
264 return ret;
265}
266
267#if IS_ENABLED(CONFIG_IPV6)
268static int addr6_resolve(struct sockaddr_in6 *src_in,
269 struct sockaddr_in6 *dst_in,
270 struct rdma_dev_addr *addr)
271{
272 struct flowi6 fl6;
273 struct dst_entry *dst;
274 int ret;
275
276 memset(&fl6, 0, sizeof fl6);
277 fl6.daddr = dst_in->sin6_addr;
278 fl6.saddr = src_in->sin6_addr;
279 fl6.flowi6_oif = addr->bound_dev_if;
280
281 dst = ip6_route_output(&init_net, NULL, &fl6);
282 if ((ret = dst->error))
283 goto put;
284
285 if (ipv6_addr_any(&fl6.saddr)) {
286 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev,
287 &fl6.daddr, 0, &fl6.saddr);
288 if (ret)
289 goto put;
290
291 src_in->sin6_family = AF_INET6;
292 src_in->sin6_addr = fl6.saddr;
293 }
294
295 if (dst->dev->flags & IFF_LOOPBACK) {
296 ret = rdma_translate_ip((struct sockaddr *)dst_in, addr, NULL);
297 if (!ret)
298 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
299 goto put;
300 }
301
302 /* If the device does ARP internally, return 'done' */
303 if (dst->dev->flags & IFF_NOARP) {
304 ret = rdma_copy_addr(addr, dst->dev, NULL);
305 goto put;
306 }
307
308 ret = dst_fetch_ha(dst, addr, &fl6.daddr);
309put:
310 dst_release(dst);
311 return ret;
312}
313#else
314static int addr6_resolve(struct sockaddr_in6 *src_in,
315 struct sockaddr_in6 *dst_in,
316 struct rdma_dev_addr *addr)
317{
318 return -EADDRNOTAVAIL;
319}
320#endif
321
322static int addr_resolve(struct sockaddr *src_in,
323 struct sockaddr *dst_in,
324 struct rdma_dev_addr *addr)
325{
326 if (src_in->sa_family == AF_INET) {
327 return addr4_resolve((struct sockaddr_in *) src_in,
328 (struct sockaddr_in *) dst_in, addr);
329 } else
330 return addr6_resolve((struct sockaddr_in6 *) src_in,
331 (struct sockaddr_in6 *) dst_in, addr);
332}
333
334static void process_req(struct work_struct *work)
335{
336 struct addr_req *req, *temp_req;
337 struct sockaddr *src_in, *dst_in;
338 struct list_head done_list;
339
340 INIT_LIST_HEAD(&done_list);
341
342 mutex_lock(&lock);
343 list_for_each_entry_safe(req, temp_req, &req_list, list) {
344 if (req->status == -ENODATA) {
345 src_in = (struct sockaddr *) &req->src_addr;
346 dst_in = (struct sockaddr *) &req->dst_addr;
347 req->status = addr_resolve(src_in, dst_in, req->addr);
348 if (req->status && time_after_eq(jiffies, req->timeout))
349 req->status = -ETIMEDOUT;
350 else if (req->status == -ENODATA)
351 continue;
352 }
353 list_move_tail(&req->list, &done_list);
354 }
355
356 if (!list_empty(&req_list)) {
357 req = list_entry(req_list.next, struct addr_req, list);
358 set_timeout(req->timeout);
359 }
360 mutex_unlock(&lock);
361
362 list_for_each_entry_safe(req, temp_req, &done_list, list) {
363 list_del(&req->list);
364 req->callback(req->status, (struct sockaddr *) &req->src_addr,
365 req->addr, req->context);
366 put_client(req->client);
367 kfree(req);
368 }
369}
370
371int rdma_resolve_ip(struct rdma_addr_client *client,
372 struct sockaddr *src_addr, struct sockaddr *dst_addr,
373 struct rdma_dev_addr *addr, int timeout_ms,
374 void (*callback)(int status, struct sockaddr *src_addr,
375 struct rdma_dev_addr *addr, void *context),
376 void *context)
377{
378 struct sockaddr *src_in, *dst_in;
379 struct addr_req *req;
380 int ret = 0;
381
382 req = kzalloc(sizeof *req, GFP_KERNEL);
383 if (!req)
384 return -ENOMEM;
385
386 src_in = (struct sockaddr *) &req->src_addr;
387 dst_in = (struct sockaddr *) &req->dst_addr;
388
389 if (src_addr) {
390 if (src_addr->sa_family != dst_addr->sa_family) {
391 ret = -EINVAL;
392 goto err;
393 }
394
395 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
396 } else {
397 src_in->sa_family = dst_addr->sa_family;
398 }
399
400 memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
401 req->addr = addr;
402 req->callback = callback;
403 req->context = context;
404 req->client = client;
405 atomic_inc(&client->refcount);
406
407 req->status = addr_resolve(src_in, dst_in, addr);
408 switch (req->status) {
409 case 0:
410 req->timeout = jiffies;
411 queue_req(req);
412 break;
413 case -ENODATA:
414 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
415 queue_req(req);
416 break;
417 default:
418 ret = req->status;
419 atomic_dec(&client->refcount);
420 goto err;
421 }
422 return ret;
423err:
424 kfree(req);
425 return ret;
426}
427EXPORT_SYMBOL(rdma_resolve_ip);
428
429void rdma_addr_cancel(struct rdma_dev_addr *addr)
430{
431 struct addr_req *req, *temp_req;
432
433 mutex_lock(&lock);
434 list_for_each_entry_safe(req, temp_req, &req_list, list) {
435 if (req->addr == addr) {
436 req->status = -ECANCELED;
437 req->timeout = jiffies;
438 list_move(&req->list, &req_list);
439 set_timeout(req->timeout);
440 break;
441 }
442 }
443 mutex_unlock(&lock);
444}
445EXPORT_SYMBOL(rdma_addr_cancel);
446
447struct resolve_cb_context {
448 struct rdma_dev_addr *addr;
449 struct completion comp;
450};
451
452static void resolve_cb(int status, struct sockaddr *src_addr,
453 struct rdma_dev_addr *addr, void *context)
454{
455 memcpy(((struct resolve_cb_context *)context)->addr, addr, sizeof(struct
456 rdma_dev_addr));
457 complete(&((struct resolve_cb_context *)context)->comp);
458}
459
460int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *dmac,
461 u16 *vlan_id)
462{
463 int ret = 0;
464 struct rdma_dev_addr dev_addr;
465 struct resolve_cb_context ctx;
466 struct net_device *dev;
467
468 union {
469 struct sockaddr _sockaddr;
470 struct sockaddr_in _sockaddr_in;
471 struct sockaddr_in6 _sockaddr_in6;
472 } sgid_addr, dgid_addr;
473
474
475 ret = rdma_gid2ip(&sgid_addr._sockaddr, sgid);
476 if (ret)
477 return ret;
478
479 ret = rdma_gid2ip(&dgid_addr._sockaddr, dgid);
480 if (ret)
481 return ret;
482
483 memset(&dev_addr, 0, sizeof(dev_addr));
484
485 ctx.addr = &dev_addr;
486 init_completion(&ctx.comp);
487 ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
488 &dev_addr, 1000, resolve_cb, &ctx);
489 if (ret)
490 return ret;
491
492 wait_for_completion(&ctx.comp);
493
494 memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
495 dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if);
496 if (!dev)
497 return -ENODEV;
498 if (vlan_id)
499 *vlan_id = rdma_vlan_dev_vlan_id(dev);
500 dev_put(dev);
501 return ret;
502}
503EXPORT_SYMBOL(rdma_addr_find_dmac_by_grh);
504
505int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id)
506{
507 int ret = 0;
508 struct rdma_dev_addr dev_addr;
509 union {
510 struct sockaddr _sockaddr;
511 struct sockaddr_in _sockaddr_in;
512 struct sockaddr_in6 _sockaddr_in6;
513 } gid_addr;
514
515 ret = rdma_gid2ip(&gid_addr._sockaddr, sgid);
516
517 if (ret)
518 return ret;
519 memset(&dev_addr, 0, sizeof(dev_addr));
520 ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id);
521 if (ret)
522 return ret;
523
524 memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN);
525 return ret;
526}
527EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid);
528
529static int netevent_callback(struct notifier_block *self, unsigned long event,
530 void *ctx)
531{
532 if (event == NETEVENT_NEIGH_UPDATE) {
533 struct neighbour *neigh = ctx;
534
535 if (neigh->nud_state & NUD_VALID) {
536 set_timeout(jiffies);
537 }
538 }
539 return 0;
540}
541
542static struct notifier_block nb = {
543 .notifier_call = netevent_callback
544};
545
546static int __init addr_init(void)
547{
548 addr_wq = create_singlethread_workqueue("ib_addr");
549 if (!addr_wq)
550 return -ENOMEM;
551
552 register_netevent_notifier(&nb);
553 rdma_addr_register_client(&self);
554 return 0;
555}
556
557static void __exit addr_cleanup(void)
558{
559 rdma_addr_unregister_client(&self);
560 unregister_netevent_notifier(&nb);
561 destroy_workqueue(addr_wq);
562}
563
564module_init(addr_init);
565module_exit(addr_cleanup);