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 *addr) 182 { 183 struct neighbour *n; 184 int ret; 185 186 rcu_read_lock(); 187 n = dst_get_neighbour_noref(dst); 188 if (!n || !(n->nud_state & NUD_VALID)) { 189 if (n) 190 neigh_event_send(n, NULL); 191 ret = -ENODATA; 192 } else { 193 ret = rdma_copy_addr(addr, dst->dev, n->ha); 194 } 195 rcu_read_unlock(); 196 197 return ret; 198 } 199 200 static int addr4_resolve(struct sockaddr_in *src_in, 201 struct sockaddr_in *dst_in, 202 struct rdma_dev_addr *addr) 203 { 204 __be32 src_ip = src_in->sin_addr.s_addr; 205 __be32 dst_ip = dst_in->sin_addr.s_addr; 206 struct rtable *rt; 207 struct flowi4 fl4; 208 int ret; 209 210 memset(&fl4, 0, sizeof(fl4)); 211 fl4.daddr = dst_ip; 212 fl4.saddr = src_ip; 213 fl4.flowi4_oif = addr->bound_dev_if; 214 rt = ip_route_output_key(&init_net, &fl4); 215 if (IS_ERR(rt)) { 216 ret = PTR_ERR(rt); 217 goto out; 218 } 219 src_in->sin_family = AF_INET; 220 src_in->sin_addr.s_addr = fl4.saddr; 221 222 if (rt->dst.dev->flags & IFF_LOOPBACK) { 223 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); 224 if (!ret) 225 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); 226 goto put; 227 } 228 229 /* If the device does ARP internally, return 'done' */ 230 if (rt->dst.dev->flags & IFF_NOARP) { 231 ret = rdma_copy_addr(addr, rt->dst.dev, NULL); 232 goto put; 233 } 234 235 ret = dst_fetch_ha(&rt->dst, addr); 236 put: 237 ip_rt_put(rt); 238 out: 239 return ret; 240 } 241 242 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 243 static int addr6_resolve(struct sockaddr_in6 *src_in, 244 struct sockaddr_in6 *dst_in, 245 struct rdma_dev_addr *addr) 246 { 247 struct flowi6 fl6; 248 struct dst_entry *dst; 249 int ret; 250 251 memset(&fl6, 0, sizeof fl6); 252 fl6.daddr = dst_in->sin6_addr; 253 fl6.saddr = src_in->sin6_addr; 254 fl6.flowi6_oif = addr->bound_dev_if; 255 256 dst = ip6_route_output(&init_net, NULL, &fl6); 257 if ((ret = dst->error)) 258 goto put; 259 260 if (ipv6_addr_any(&fl6.saddr)) { 261 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev, 262 &fl6.daddr, 0, &fl6.saddr); 263 if (ret) 264 goto put; 265 266 src_in->sin6_family = AF_INET6; 267 src_in->sin6_addr = fl6.saddr; 268 } 269 270 if (dst->dev->flags & IFF_LOOPBACK) { 271 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); 272 if (!ret) 273 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); 274 goto put; 275 } 276 277 /* If the device does ARP internally, return 'done' */ 278 if (dst->dev->flags & IFF_NOARP) { 279 ret = rdma_copy_addr(addr, dst->dev, NULL); 280 goto put; 281 } 282 283 ret = dst_fetch_ha(dst, addr); 284 put: 285 dst_release(dst); 286 return ret; 287 } 288 #else 289 static int addr6_resolve(struct sockaddr_in6 *src_in, 290 struct sockaddr_in6 *dst_in, 291 struct rdma_dev_addr *addr) 292 { 293 return -EADDRNOTAVAIL; 294 } 295 #endif 296 297 static int addr_resolve(struct sockaddr *src_in, 298 struct sockaddr *dst_in, 299 struct rdma_dev_addr *addr) 300 { 301 if (src_in->sa_family == AF_INET) { 302 return addr4_resolve((struct sockaddr_in *) src_in, 303 (struct sockaddr_in *) dst_in, addr); 304 } else 305 return addr6_resolve((struct sockaddr_in6 *) src_in, 306 (struct sockaddr_in6 *) dst_in, addr); 307 } 308 309 static void process_req(struct work_struct *work) 310 { 311 struct addr_req *req, *temp_req; 312 struct sockaddr *src_in, *dst_in; 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) { 319 if (req->status == -ENODATA) { 320 src_in = (struct sockaddr *) &req->src_addr; 321 dst_in = (struct sockaddr *) &req->dst_addr; 322 req->status = addr_resolve(src_in, dst_in, req->addr); 323 if (req->status && time_after_eq(jiffies, req->timeout)) 324 req->status = -ETIMEDOUT; 325 else if (req->status == -ENODATA) 326 continue; 327 } 328 list_move_tail(&req->list, &done_list); 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); 339 req->callback(req->status, (struct sockaddr *) &req->src_addr, 340 req->addr, req->context); 341 put_client(req->client); 342 kfree(req); 343 } 344 } 345 346 int rdma_resolve_ip(struct rdma_addr_client *client, 347 struct sockaddr *src_addr, struct sockaddr *dst_addr, 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 { 353 struct sockaddr *src_in, *dst_in; 354 struct addr_req *req; 355 int ret = 0; 356 357 req = kzalloc(sizeof *req, GFP_KERNEL); 358 if (!req) 359 return -ENOMEM; 360 361 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)); 376 req->addr = addr; 377 req->callback = callback; 378 req->context = context; 379 req->client = client; 380 atomic_inc(&client->refcount); 381 382 req->status = addr_resolve(src_in, dst_in, addr); 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); 391 break; 392 default: 393 ret = req->status; 394 atomic_dec(&client->refcount); 395 goto err; 396 } 397 return ret; 398 err: 399 kfree(req); 400 return ret; 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; 413 list_move(&req->list, &req_list); 414 set_timeout(req->timeout); 415 break; 416 } 417 } 418 mutex_unlock(&lock); 419 } 420 EXPORT_SYMBOL(rdma_addr_cancel); 421 422 static int netevent_callback(struct notifier_block *self, unsigned long event, 423 void *ctx) 424 { 425 if (event == NETEVENT_NEIGH_UPDATE) { 426 struct neighbour *neigh = ctx; 427 428 if (neigh->nud_state & NUD_VALID) { 429 set_timeout(jiffies); 430 } 431 } 432 return 0; 433 } 434 435 static struct notifier_block nb = { 436 .notifier_call = netevent_callback 437 }; 438 439 static int __init addr_init(void) 440 { 441 addr_wq = create_singlethread_workqueue("ib_addr"); 442 if (!addr_wq) 443 return -ENOMEM; 444 445 register_netevent_notifier(&nb); 446 return 0; 447 } 448 449 static void __exit addr_cleanup(void) 450 { 451 unregister_netevent_notifier(&nb); 452 destroy_workqueue(addr_wq); 453 } 454 455 module_init(addr_init); 456 module_exit(addr_cleanup); 457