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 delay = time - jiffies; 156 if ((long)delay <= 0) 157 delay = 1; 158 159 mod_delayed_work(addr_wq, &work, delay); 160 } 161 162 static void queue_req(struct addr_req *req) 163 { 164 struct addr_req *temp_req; 165 166 mutex_lock(&lock); 167 list_for_each_entry_reverse(temp_req, &req_list, list) { 168 if (time_after_eq(req->timeout, temp_req->timeout)) 169 break; 170 } 171 172 list_add(&req->list, &temp_req->list); 173 174 if (req_list.next == &req->list) 175 set_timeout(req->timeout); 176 mutex_unlock(&lock); 177 } 178 179 static int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr, void *daddr) 180 { 181 struct neighbour *n; 182 int ret; 183 184 n = dst_neigh_lookup(dst, daddr); 185 186 rcu_read_lock(); 187 if (!n || !(n->nud_state & NUD_VALID)) { 188 if (n) 189 neigh_event_send(n, NULL); 190 ret = -ENODATA; 191 } else { 192 ret = rdma_copy_addr(dev_addr, dst->dev, n->ha); 193 } 194 rcu_read_unlock(); 195 196 if (n) 197 neigh_release(n); 198 199 return ret; 200 } 201 202 static int addr4_resolve(struct sockaddr_in *src_in, 203 struct sockaddr_in *dst_in, 204 struct rdma_dev_addr *addr) 205 { 206 __be32 src_ip = src_in->sin_addr.s_addr; 207 __be32 dst_ip = dst_in->sin_addr.s_addr; 208 struct rtable *rt; 209 struct flowi4 fl4; 210 int ret; 211 212 memset(&fl4, 0, sizeof(fl4)); 213 fl4.daddr = dst_ip; 214 fl4.saddr = src_ip; 215 fl4.flowi4_oif = addr->bound_dev_if; 216 rt = ip_route_output_key(&init_net, &fl4); 217 if (IS_ERR(rt)) { 218 ret = PTR_ERR(rt); 219 goto out; 220 } 221 src_in->sin_family = AF_INET; 222 src_in->sin_addr.s_addr = fl4.saddr; 223 224 if (rt->dst.dev->flags & IFF_LOOPBACK) { 225 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); 226 if (!ret) 227 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); 228 goto put; 229 } 230 231 /* If the device does ARP internally, return 'done' */ 232 if (rt->dst.dev->flags & IFF_NOARP) { 233 ret = rdma_copy_addr(addr, rt->dst.dev, NULL); 234 goto put; 235 } 236 237 ret = dst_fetch_ha(&rt->dst, addr, &fl4.daddr); 238 put: 239 ip_rt_put(rt); 240 out: 241 return ret; 242 } 243 244 #if IS_ENABLED(CONFIG_IPV6) 245 static int addr6_resolve(struct sockaddr_in6 *src_in, 246 struct sockaddr_in6 *dst_in, 247 struct rdma_dev_addr *addr) 248 { 249 struct flowi6 fl6; 250 struct dst_entry *dst; 251 int ret; 252 253 memset(&fl6, 0, sizeof fl6); 254 fl6.daddr = dst_in->sin6_addr; 255 fl6.saddr = src_in->sin6_addr; 256 fl6.flowi6_oif = addr->bound_dev_if; 257 258 dst = ip6_route_output(&init_net, NULL, &fl6); 259 if ((ret = dst->error)) 260 goto put; 261 262 if (ipv6_addr_any(&fl6.saddr)) { 263 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev, 264 &fl6.daddr, 0, &fl6.saddr); 265 if (ret) 266 goto put; 267 268 src_in->sin6_family = AF_INET6; 269 src_in->sin6_addr = fl6.saddr; 270 } 271 272 if (dst->dev->flags & IFF_LOOPBACK) { 273 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); 274 if (!ret) 275 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); 276 goto put; 277 } 278 279 /* If the device does ARP internally, return 'done' */ 280 if (dst->dev->flags & IFF_NOARP) { 281 ret = rdma_copy_addr(addr, dst->dev, NULL); 282 goto put; 283 } 284 285 ret = dst_fetch_ha(dst, addr, &fl6.daddr); 286 put: 287 dst_release(dst); 288 return ret; 289 } 290 #else 291 static int addr6_resolve(struct sockaddr_in6 *src_in, 292 struct sockaddr_in6 *dst_in, 293 struct rdma_dev_addr *addr) 294 { 295 return -EADDRNOTAVAIL; 296 } 297 #endif 298 299 static int addr_resolve(struct sockaddr *src_in, 300 struct sockaddr *dst_in, 301 struct rdma_dev_addr *addr) 302 { 303 if (src_in->sa_family == AF_INET) { 304 return addr4_resolve((struct sockaddr_in *) src_in, 305 (struct sockaddr_in *) dst_in, addr); 306 } else 307 return addr6_resolve((struct sockaddr_in6 *) src_in, 308 (struct sockaddr_in6 *) dst_in, addr); 309 } 310 311 static void process_req(struct work_struct *work) 312 { 313 struct addr_req *req, *temp_req; 314 struct sockaddr *src_in, *dst_in; 315 struct list_head done_list; 316 317 INIT_LIST_HEAD(&done_list); 318 319 mutex_lock(&lock); 320 list_for_each_entry_safe(req, temp_req, &req_list, list) { 321 if (req->status == -ENODATA) { 322 src_in = (struct sockaddr *) &req->src_addr; 323 dst_in = (struct sockaddr *) &req->dst_addr; 324 req->status = addr_resolve(src_in, dst_in, req->addr); 325 if (req->status && time_after_eq(jiffies, req->timeout)) 326 req->status = -ETIMEDOUT; 327 else if (req->status == -ENODATA) 328 continue; 329 } 330 list_move_tail(&req->list, &done_list); 331 } 332 333 if (!list_empty(&req_list)) { 334 req = list_entry(req_list.next, struct addr_req, list); 335 set_timeout(req->timeout); 336 } 337 mutex_unlock(&lock); 338 339 list_for_each_entry_safe(req, temp_req, &done_list, list) { 340 list_del(&req->list); 341 req->callback(req->status, (struct sockaddr *) &req->src_addr, 342 req->addr, req->context); 343 put_client(req->client); 344 kfree(req); 345 } 346 } 347 348 int rdma_resolve_ip(struct rdma_addr_client *client, 349 struct sockaddr *src_addr, struct sockaddr *dst_addr, 350 struct rdma_dev_addr *addr, int timeout_ms, 351 void (*callback)(int status, struct sockaddr *src_addr, 352 struct rdma_dev_addr *addr, void *context), 353 void *context) 354 { 355 struct sockaddr *src_in, *dst_in; 356 struct addr_req *req; 357 int ret = 0; 358 359 req = kzalloc(sizeof *req, GFP_KERNEL); 360 if (!req) 361 return -ENOMEM; 362 363 src_in = (struct sockaddr *) &req->src_addr; 364 dst_in = (struct sockaddr *) &req->dst_addr; 365 366 if (src_addr) { 367 if (src_addr->sa_family != dst_addr->sa_family) { 368 ret = -EINVAL; 369 goto err; 370 } 371 372 memcpy(src_in, src_addr, ip_addr_size(src_addr)); 373 } else { 374 src_in->sa_family = dst_addr->sa_family; 375 } 376 377 memcpy(dst_in, dst_addr, ip_addr_size(dst_addr)); 378 req->addr = addr; 379 req->callback = callback; 380 req->context = context; 381 req->client = client; 382 atomic_inc(&client->refcount); 383 384 req->status = addr_resolve(src_in, dst_in, addr); 385 switch (req->status) { 386 case 0: 387 req->timeout = jiffies; 388 queue_req(req); 389 break; 390 case -ENODATA: 391 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies; 392 queue_req(req); 393 break; 394 default: 395 ret = req->status; 396 atomic_dec(&client->refcount); 397 goto err; 398 } 399 return ret; 400 err: 401 kfree(req); 402 return ret; 403 } 404 EXPORT_SYMBOL(rdma_resolve_ip); 405 406 void rdma_addr_cancel(struct rdma_dev_addr *addr) 407 { 408 struct addr_req *req, *temp_req; 409 410 mutex_lock(&lock); 411 list_for_each_entry_safe(req, temp_req, &req_list, list) { 412 if (req->addr == addr) { 413 req->status = -ECANCELED; 414 req->timeout = jiffies; 415 list_move(&req->list, &req_list); 416 set_timeout(req->timeout); 417 break; 418 } 419 } 420 mutex_unlock(&lock); 421 } 422 EXPORT_SYMBOL(rdma_addr_cancel); 423 424 static int netevent_callback(struct notifier_block *self, unsigned long event, 425 void *ctx) 426 { 427 if (event == NETEVENT_NEIGH_UPDATE) { 428 struct neighbour *neigh = ctx; 429 430 if (neigh->nud_state & NUD_VALID) { 431 set_timeout(jiffies); 432 } 433 } 434 return 0; 435 } 436 437 static struct notifier_block nb = { 438 .notifier_call = netevent_callback 439 }; 440 441 static int __init addr_init(void) 442 { 443 addr_wq = create_singlethread_workqueue("ib_addr"); 444 if (!addr_wq) 445 return -ENOMEM; 446 447 register_netevent_notifier(&nb); 448 return 0; 449 } 450 451 static void __exit addr_cleanup(void) 452 { 453 unregister_netevent_notifier(&nb); 454 destroy_workqueue(addr_wq); 455 } 456 457 module_init(addr_init); 458 module_exit(addr_cleanup); 459