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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 | * | |
7 | * This Software is licensed under one of the following licenses: | |
8 | * | |
9 | * 1) under the terms of the "Common Public License 1.0" a copy of which is | |
10 | * available from the Open Source Initiative, see | |
11 | * http://www.opensource.org/licenses/cpl.php. | |
12 | * | |
13 | * 2) under the terms of the "The BSD License" a copy of which is | |
14 | * available from the Open Source Initiative, see | |
15 | * http://www.opensource.org/licenses/bsd-license.php. | |
16 | * | |
17 | * 3) under the terms of the "GNU General Public License (GPL) Version 2" a | |
18 | * copy of which is available from the Open Source Initiative, see | |
19 | * http://www.opensource.org/licenses/gpl-license.php. | |
20 | * | |
21 | * Licensee has the right to choose one of the above licenses. | |
22 | * | |
23 | * Redistributions of source code must retain the above copyright | |
24 | * notice and one of the license notices. | |
25 | * | |
26 | * Redistributions in binary form must reproduce both the above copyright | |
27 | * notice, one of the license notices in the documentation | |
28 | * and/or other materials provided with the distribution. | |
29 | */ | |
30 | ||
31 | #include <linux/mutex.h> | |
32 | #include <linux/inetdevice.h> | |
33 | #include <linux/workqueue.h> | |
34 | #include <linux/if_arp.h> | |
35 | #include <net/arp.h> | |
36 | #include <net/neighbour.h> | |
37 | #include <net/route.h> | |
e795d092 | 38 | #include <net/netevent.h> |
7025fcd3 SH |
39 | #include <rdma/ib_addr.h> |
40 | ||
41 | MODULE_AUTHOR("Sean Hefty"); | |
42 | MODULE_DESCRIPTION("IB Address Translation"); | |
43 | MODULE_LICENSE("Dual BSD/GPL"); | |
44 | ||
45 | struct addr_req { | |
46 | struct list_head list; | |
47 | struct sockaddr src_addr; | |
48 | struct sockaddr dst_addr; | |
49 | struct rdma_dev_addr *addr; | |
50 | void *context; | |
51 | void (*callback)(int status, struct sockaddr *src_addr, | |
52 | struct rdma_dev_addr *addr, void *context); | |
53 | unsigned long timeout; | |
54 | int status; | |
55 | }; | |
56 | ||
57 | static void process_req(void *data); | |
58 | ||
59 | static DEFINE_MUTEX(lock); | |
60 | static LIST_HEAD(req_list); | |
61 | static DECLARE_WORK(work, process_req, NULL); | |
62 | static struct workqueue_struct *addr_wq; | |
63 | ||
07ebafba TT |
64 | int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev, |
65 | const unsigned char *dst_dev_addr) | |
7025fcd3 SH |
66 | { |
67 | switch (dev->type) { | |
68 | case ARPHRD_INFINIBAND: | |
07ebafba TT |
69 | dev_addr->dev_type = RDMA_NODE_IB_CA; |
70 | break; | |
71 | case ARPHRD_ETHER: | |
72 | dev_addr->dev_type = RDMA_NODE_RNIC; | |
7025fcd3 SH |
73 | break; |
74 | default: | |
75 | return -EADDRNOTAVAIL; | |
76 | } | |
77 | ||
78 | memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN); | |
79 | memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN); | |
80 | if (dst_dev_addr) | |
81 | memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN); | |
82 | return 0; | |
83 | } | |
07ebafba | 84 | EXPORT_SYMBOL(rdma_copy_addr); |
7025fcd3 SH |
85 | |
86 | int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr) | |
87 | { | |
88 | struct net_device *dev; | |
89 | u32 ip = ((struct sockaddr_in *) addr)->sin_addr.s_addr; | |
90 | int ret; | |
91 | ||
92 | dev = ip_dev_find(ip); | |
93 | if (!dev) | |
94 | return -EADDRNOTAVAIL; | |
95 | ||
07ebafba | 96 | ret = rdma_copy_addr(dev_addr, dev, NULL); |
7025fcd3 SH |
97 | dev_put(dev); |
98 | return ret; | |
99 | } | |
100 | EXPORT_SYMBOL(rdma_translate_ip); | |
101 | ||
102 | static void set_timeout(unsigned long time) | |
103 | { | |
104 | unsigned long delay; | |
105 | ||
106 | cancel_delayed_work(&work); | |
107 | ||
108 | delay = time - jiffies; | |
109 | if ((long)delay <= 0) | |
110 | delay = 1; | |
111 | ||
112 | queue_delayed_work(addr_wq, &work, delay); | |
113 | } | |
114 | ||
115 | static void queue_req(struct addr_req *req) | |
116 | { | |
117 | struct addr_req *temp_req; | |
118 | ||
119 | mutex_lock(&lock); | |
120 | list_for_each_entry_reverse(temp_req, &req_list, list) { | |
121 | if (time_after(req->timeout, temp_req->timeout)) | |
122 | break; | |
123 | } | |
124 | ||
125 | list_add(&req->list, &temp_req->list); | |
126 | ||
127 | if (req_list.next == &req->list) | |
128 | set_timeout(req->timeout); | |
129 | mutex_unlock(&lock); | |
130 | } | |
131 | ||
132 | static void addr_send_arp(struct sockaddr_in *dst_in) | |
133 | { | |
134 | struct rtable *rt; | |
135 | struct flowi fl; | |
136 | u32 dst_ip = dst_in->sin_addr.s_addr; | |
137 | ||
138 | memset(&fl, 0, sizeof fl); | |
139 | fl.nl_u.ip4_u.daddr = dst_ip; | |
140 | if (ip_route_output_key(&rt, &fl)) | |
141 | return; | |
142 | ||
143 | arp_send(ARPOP_REQUEST, ETH_P_ARP, rt->rt_gateway, rt->idev->dev, | |
144 | rt->rt_src, NULL, rt->idev->dev->dev_addr, NULL); | |
145 | ip_rt_put(rt); | |
146 | } | |
147 | ||
148 | static int addr_resolve_remote(struct sockaddr_in *src_in, | |
149 | struct sockaddr_in *dst_in, | |
150 | struct rdma_dev_addr *addr) | |
151 | { | |
152 | u32 src_ip = src_in->sin_addr.s_addr; | |
153 | u32 dst_ip = dst_in->sin_addr.s_addr; | |
154 | struct flowi fl; | |
155 | struct rtable *rt; | |
156 | struct neighbour *neigh; | |
157 | int ret; | |
158 | ||
159 | memset(&fl, 0, sizeof fl); | |
160 | fl.nl_u.ip4_u.daddr = dst_ip; | |
161 | fl.nl_u.ip4_u.saddr = src_ip; | |
162 | ret = ip_route_output_key(&rt, &fl); | |
163 | if (ret) | |
164 | goto out; | |
165 | ||
166 | /* If the device does ARP internally, return 'done' */ | |
167 | if (rt->idev->dev->flags & IFF_NOARP) { | |
07ebafba | 168 | rdma_copy_addr(addr, rt->idev->dev, NULL); |
7025fcd3 SH |
169 | goto put; |
170 | } | |
171 | ||
172 | neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev); | |
173 | if (!neigh) { | |
174 | ret = -ENODATA; | |
175 | goto put; | |
176 | } | |
177 | ||
178 | if (!(neigh->nud_state & NUD_VALID)) { | |
179 | ret = -ENODATA; | |
180 | goto release; | |
181 | } | |
182 | ||
183 | if (!src_ip) { | |
184 | src_in->sin_family = dst_in->sin_family; | |
185 | src_in->sin_addr.s_addr = rt->rt_src; | |
186 | } | |
187 | ||
07ebafba | 188 | ret = rdma_copy_addr(addr, neigh->dev, neigh->ha); |
7025fcd3 SH |
189 | release: |
190 | neigh_release(neigh); | |
191 | put: | |
192 | ip_rt_put(rt); | |
193 | out: | |
194 | return ret; | |
195 | } | |
196 | ||
197 | static void process_req(void *data) | |
198 | { | |
199 | struct addr_req *req, *temp_req; | |
200 | struct sockaddr_in *src_in, *dst_in; | |
201 | struct list_head done_list; | |
202 | ||
203 | INIT_LIST_HEAD(&done_list); | |
204 | ||
205 | mutex_lock(&lock); | |
206 | list_for_each_entry_safe(req, temp_req, &req_list, list) { | |
207 | if (req->status) { | |
208 | src_in = (struct sockaddr_in *) &req->src_addr; | |
209 | dst_in = (struct sockaddr_in *) &req->dst_addr; | |
210 | req->status = addr_resolve_remote(src_in, dst_in, | |
211 | req->addr); | |
212 | } | |
213 | if (req->status && time_after(jiffies, req->timeout)) | |
214 | req->status = -ETIMEDOUT; | |
215 | else if (req->status == -ENODATA) | |
216 | continue; | |
217 | ||
218 | list_del(&req->list); | |
219 | list_add_tail(&req->list, &done_list); | |
220 | } | |
221 | ||
222 | if (!list_empty(&req_list)) { | |
223 | req = list_entry(req_list.next, struct addr_req, list); | |
224 | set_timeout(req->timeout); | |
225 | } | |
226 | mutex_unlock(&lock); | |
227 | ||
228 | list_for_each_entry_safe(req, temp_req, &done_list, list) { | |
229 | list_del(&req->list); | |
230 | req->callback(req->status, &req->src_addr, req->addr, | |
231 | req->context); | |
232 | kfree(req); | |
233 | } | |
234 | } | |
235 | ||
236 | static int addr_resolve_local(struct sockaddr_in *src_in, | |
237 | struct sockaddr_in *dst_in, | |
238 | struct rdma_dev_addr *addr) | |
239 | { | |
240 | struct net_device *dev; | |
241 | u32 src_ip = src_in->sin_addr.s_addr; | |
242 | u32 dst_ip = dst_in->sin_addr.s_addr; | |
243 | int ret; | |
244 | ||
245 | dev = ip_dev_find(dst_ip); | |
246 | if (!dev) | |
247 | return -EADDRNOTAVAIL; | |
248 | ||
249 | if (ZERONET(src_ip)) { | |
250 | src_in->sin_family = dst_in->sin_family; | |
251 | src_in->sin_addr.s_addr = dst_ip; | |
07ebafba | 252 | ret = rdma_copy_addr(addr, dev, dev->dev_addr); |
7025fcd3 SH |
253 | } else if (LOOPBACK(src_ip)) { |
254 | ret = rdma_translate_ip((struct sockaddr *)dst_in, addr); | |
255 | if (!ret) | |
256 | memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN); | |
257 | } else { | |
258 | ret = rdma_translate_ip((struct sockaddr *)src_in, addr); | |
259 | if (!ret) | |
260 | memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN); | |
261 | } | |
262 | ||
263 | dev_put(dev); | |
264 | return ret; | |
265 | } | |
266 | ||
267 | int rdma_resolve_ip(struct sockaddr *src_addr, struct sockaddr *dst_addr, | |
268 | struct rdma_dev_addr *addr, int timeout_ms, | |
269 | void (*callback)(int status, struct sockaddr *src_addr, | |
270 | struct rdma_dev_addr *addr, void *context), | |
271 | void *context) | |
272 | { | |
273 | struct sockaddr_in *src_in, *dst_in; | |
274 | struct addr_req *req; | |
275 | int ret = 0; | |
276 | ||
277 | req = kmalloc(sizeof *req, GFP_KERNEL); | |
278 | if (!req) | |
279 | return -ENOMEM; | |
280 | memset(req, 0, sizeof *req); | |
281 | ||
282 | if (src_addr) | |
283 | memcpy(&req->src_addr, src_addr, ip_addr_size(src_addr)); | |
284 | memcpy(&req->dst_addr, dst_addr, ip_addr_size(dst_addr)); | |
285 | req->addr = addr; | |
286 | req->callback = callback; | |
287 | req->context = context; | |
288 | ||
289 | src_in = (struct sockaddr_in *) &req->src_addr; | |
290 | dst_in = (struct sockaddr_in *) &req->dst_addr; | |
291 | ||
292 | req->status = addr_resolve_local(src_in, dst_in, addr); | |
293 | if (req->status == -EADDRNOTAVAIL) | |
294 | req->status = addr_resolve_remote(src_in, dst_in, addr); | |
295 | ||
296 | switch (req->status) { | |
297 | case 0: | |
298 | req->timeout = jiffies; | |
299 | queue_req(req); | |
300 | break; | |
301 | case -ENODATA: | |
302 | req->timeout = msecs_to_jiffies(timeout_ms) + jiffies; | |
303 | queue_req(req); | |
304 | addr_send_arp(dst_in); | |
305 | break; | |
306 | default: | |
307 | ret = req->status; | |
308 | kfree(req); | |
309 | break; | |
310 | } | |
311 | return ret; | |
312 | } | |
313 | EXPORT_SYMBOL(rdma_resolve_ip); | |
314 | ||
315 | void rdma_addr_cancel(struct rdma_dev_addr *addr) | |
316 | { | |
317 | struct addr_req *req, *temp_req; | |
318 | ||
319 | mutex_lock(&lock); | |
320 | list_for_each_entry_safe(req, temp_req, &req_list, list) { | |
321 | if (req->addr == addr) { | |
322 | req->status = -ECANCELED; | |
323 | req->timeout = jiffies; | |
324 | list_del(&req->list); | |
325 | list_add(&req->list, &req_list); | |
326 | set_timeout(req->timeout); | |
327 | break; | |
328 | } | |
329 | } | |
330 | mutex_unlock(&lock); | |
331 | } | |
332 | EXPORT_SYMBOL(rdma_addr_cancel); | |
333 | ||
3cd96564 | 334 | static int netevent_callback(struct notifier_block *self, unsigned long event, |
e795d092 | 335 | void *ctx) |
7025fcd3 | 336 | { |
3cd96564 | 337 | if (event == NETEVENT_NEIGH_UPDATE) { |
e795d092 | 338 | struct neighbour *neigh = ctx; |
7025fcd3 | 339 | |
e795d092 TT |
340 | if (neigh->dev->type == ARPHRD_INFINIBAND && |
341 | (neigh->nud_state & NUD_VALID)) { | |
342 | set_timeout(jiffies); | |
343 | } | |
344 | } | |
7025fcd3 SH |
345 | return 0; |
346 | } | |
347 | ||
e795d092 TT |
348 | static struct notifier_block nb = { |
349 | .notifier_call = netevent_callback | |
7025fcd3 SH |
350 | }; |
351 | ||
352 | static int addr_init(void) | |
353 | { | |
354 | addr_wq = create_singlethread_workqueue("ib_addr_wq"); | |
355 | if (!addr_wq) | |
356 | return -ENOMEM; | |
357 | ||
e795d092 | 358 | register_netevent_notifier(&nb); |
7025fcd3 SH |
359 | return 0; |
360 | } | |
361 | ||
362 | static void addr_cleanup(void) | |
363 | { | |
e795d092 | 364 | unregister_netevent_notifier(&nb); |
7025fcd3 SH |
365 | destroy_workqueue(addr_wq); |
366 | } | |
367 | ||
368 | module_init(addr_init); | |
369 | module_exit(addr_cleanup); |