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 IS_ENABLED(CONFIG_IPV6) 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 *dev_addr, void *daddr) 182 { 183 struct neighbour *n; 184 int ret; 185 186 n = dst_neigh_lookup(dst, daddr); 187 188 rcu_read_lock(); 189 if (!n || !(n->nud_state & NUD_VALID)) { 190 if (n) 191 neigh_event_send(n, NULL); 192 ret = -ENODATA; 193 } else { 194 ret = rdma_copy_addr(dev_addr, dst->dev, n->ha); 195 } 196 rcu_read_unlock(); 197 198 if (n) 199 neigh_release(n); 200 201 return ret; 202 } 203 204 static int addr4_resolve(struct sockaddr_in *src_in, 205 struct sockaddr_in *dst_in, 206 struct rdma_dev_addr *addr) 207 { 208 __be32 src_ip = src_in->sin_addr.s_addr; 209 __be32 dst_ip = dst_in->sin_addr.s_addr; 210 struct rtable *rt; 211 struct flowi4 fl4; 212 int ret; 213 214 memset(&fl4, 0, sizeof(fl4)); 215 fl4.daddr = dst_ip; 216 fl4.saddr = src_ip; 217 fl4.flowi4_oif = addr->bound_dev_if; 218 rt = ip_route_output_key(&init_net, &fl4); 219 if (IS_ERR(rt)) { 220 ret = PTR_ERR(rt); 221 goto out; 222 } 223 src_in->sin_family = AF_INET; 224 src_in->sin_addr.s_addr = fl4.saddr; 225 226 if (rt->dst.dev->flags & IFF_LOOPBACK) { 227 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); 228 if (!ret) 229 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); 230 goto put; 231 } 232 233 /* If the device does ARP internally, return 'done' */ 234 if (rt->dst.dev->flags & IFF_NOARP) { 235 ret = rdma_copy_addr(addr, rt->dst.dev, NULL); 236 goto put; 237 } 238 239 ret = dst_fetch_ha(&rt->dst, addr, &fl4.daddr); 240 put: 241 ip_rt_put(rt); 242 out: 243 return ret; 244 } 245 246 #if IS_ENABLED(CONFIG_IPV6) 247 static int addr6_resolve(struct sockaddr_in6 *src_in, 248 struct sockaddr_in6 *dst_in, 249 struct rdma_dev_addr *addr) 250 { 251 struct flowi6 fl6; 252 struct dst_entry *dst; 253 int ret; 254 255 memset(&fl6, 0, sizeof fl6); 256 fl6.daddr = dst_in->sin6_addr; 257 fl6.saddr = src_in->sin6_addr; 258 fl6.flowi6_oif = addr->bound_dev_if; 259 260 dst = ip6_route_output(&init_net, NULL, &fl6); 261 if ((ret = dst->error)) 262 goto put; 263 264 if (ipv6_addr_any(&fl6.saddr)) { 265 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev, 266 &fl6.daddr, 0, &fl6.saddr); 267 if (ret) 268 goto put; 269 270 src_in->sin6_family = AF_INET6; 271 src_in->sin6_addr = fl6.saddr; 272 } 273 274 if (dst->dev->flags & IFF_LOOPBACK) { 275 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); 276 if (!ret) 277 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); 278 goto put; 279 } 280 281 /* If the device does ARP internally, return 'done' */ 282 if (dst->dev->flags & IFF_NOARP) { 283 ret = rdma_copy_addr(addr, dst->dev, NULL); 284 goto put; 285 } 286 287 ret = dst_fetch_ha(dst, addr, &fl6.daddr); 288 put: 289 dst_release(dst); 290 return ret; 291 } 292 #else 293 static int addr6_resolve(struct sockaddr_in6 *src_in, 294 struct sockaddr_in6 *dst_in, 295 struct rdma_dev_addr *addr) 296 { 297 return -EADDRNOTAVAIL; 298 } 299 #endif 300 301 static int addr_resolve(struct sockaddr *src_in, 302 struct sockaddr *dst_in, 303 struct rdma_dev_addr *addr) 304 { 305 if (src_in->sa_family == AF_INET) { 306 return addr4_resolve((struct sockaddr_in *) src_in, 307 (struct sockaddr_in *) dst_in, addr); 308 } else 309 return addr6_resolve((struct sockaddr_in6 *) src_in, 310 (struct sockaddr_in6 *) dst_in, addr); 311 } 312 313 static void process_req(struct work_struct *work) 314 { 315 struct addr_req *req, *temp_req; 316 struct sockaddr *src_in, *dst_in; 317 struct list_head done_list; 318 319 INIT_LIST_HEAD(&done_list); 320 321 mutex_lock(&lock); 322 list_for_each_entry_safe(req, temp_req, &req_list, list) { 323 if (req->status == -ENODATA) { 324 src_in = (struct sockaddr *) &req->src_addr; 325 dst_in = (struct sockaddr *) &req->dst_addr; 326 req->status = addr_resolve(src_in, dst_in, req->addr); 327 if (req->status && time_after_eq(jiffies, req->timeout)) 328 req->status = -ETIMEDOUT; 329 else if (req->status == -ENODATA) 330 continue; 331 } 332 list_move_tail(&req->list, &done_list); 333 } 334 335 if (!list_empty(&req_list)) { 336 req = list_entry(req_list.next, struct addr_req, list); 337 set_timeout(req->timeout); 338 } 339 mutex_unlock(&lock); 340 341 list_for_each_entry_safe(req, temp_req, &done_list, list) { 342 list_del(&req->list); 343 req->callback(req->status, (struct sockaddr *) &req->src_addr, 344 req->addr, req->context); 345 put_client(req->client); 346 kfree(req); 347 } 348 } 349 350 int rdma_resolve_ip(struct rdma_addr_client *client, 351 struct sockaddr *src_addr, struct sockaddr *dst_addr, 352 struct rdma_dev_addr *addr, int timeout_ms, 353 void (*callback)(int status, struct sockaddr *src_addr, 354 struct rdma_dev_addr *addr, void *context), 355 void *context) 356 { 357 struct sockaddr *src_in, *dst_in; 358 struct addr_req *req; 359 int ret = 0; 360 361 req = kzalloc(sizeof *req, GFP_KERNEL); 362 if (!req) 363 return -ENOMEM; 364 365 src_in = (struct sockaddr *) &req->src_addr; 366 dst_in = (struct sockaddr *) &req->dst_addr; 367 368 if (src_addr) { 369 if (src_addr->sa_family != dst_addr->sa_family) { 370 ret = -EINVAL; 371 goto err; 372 } 373 374 memcpy(src_in, src_addr, ip_addr_size(src_addr)); 375 } else { 376 src_in->sa_family = dst_addr->sa_family; 377 } 378 379 memcpy(dst_in, dst_addr, ip_addr_size(dst_addr)); 380 req->addr = addr; 381 req->callback = callback; 382 req->context = context; 383 req->client = client; 384 atomic_inc(&client->refcount); 385 386 req->status = addr_resolve(src_in, dst_in, addr); 387 switch (req->status) { 388 case 0: 389 req->timeout = jiffies; 390 queue_req(req); 391 break; 392 case -ENODATA: 393 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies; 394 queue_req(req); 395 break; 396 default: 397 ret = req->status; 398 atomic_dec(&client->refcount); 399 goto err; 400 } 401 return ret; 402 err: 403 kfree(req); 404 return ret; 405 } 406 EXPORT_SYMBOL(rdma_resolve_ip); 407 408 void rdma_addr_cancel(struct rdma_dev_addr *addr) 409 { 410 struct addr_req *req, *temp_req; 411 412 mutex_lock(&lock); 413 list_for_each_entry_safe(req, temp_req, &req_list, list) { 414 if (req->addr == addr) { 415 req->status = -ECANCELED; 416 req->timeout = jiffies; 417 list_move(&req->list, &req_list); 418 set_timeout(req->timeout); 419 break; 420 } 421 } 422 mutex_unlock(&lock); 423 } 424 EXPORT_SYMBOL(rdma_addr_cancel); 425 426 static int netevent_callback(struct notifier_block *self, unsigned long event, 427 void *ctx) 428 { 429 if (event == NETEVENT_NEIGH_UPDATE) { 430 struct neighbour *neigh = ctx; 431 432 if (neigh->nud_state & NUD_VALID) { 433 set_timeout(jiffies); 434 } 435 } 436 return 0; 437 } 438 439 static struct notifier_block nb = { 440 .notifier_call = netevent_callback 441 }; 442 443 static int __init addr_init(void) 444 { 445 addr_wq = create_singlethread_workqueue("ib_addr"); 446 if (!addr_wq) 447 return -ENOMEM; 448 449 register_netevent_notifier(&nb); 450 return 0; 451 } 452 453 static void __exit addr_cleanup(void) 454 { 455 unregister_netevent_notifier(&nb); 456 destroy_workqueue(addr_wq); 457 } 458 459 module_init(addr_init); 460 module_exit(addr_cleanup); 461