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 50 MODULE_AUTHOR("Sean Hefty"); 51 MODULE_DESCRIPTION("IB Address Translation"); 52 MODULE_LICENSE("Dual BSD/GPL"); 53 54 struct 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 67 static void process_req(struct work_struct *work); 68 69 static DEFINE_MUTEX(lock); 70 static LIST_HEAD(req_list); 71 static DECLARE_DELAYED_WORK(work, process_req); 72 static struct workqueue_struct *addr_wq; 73 74 int 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 } 87 EXPORT_SYMBOL(rdma_addr_size); 88 89 static struct rdma_addr_client self; 90 91 void rdma_addr_register_client(struct rdma_addr_client *client) 92 { 93 atomic_set(&client->refcount, 1); 94 init_completion(&client->comp); 95 } 96 EXPORT_SYMBOL(rdma_addr_register_client); 97 98 static inline void put_client(struct rdma_addr_client *client) 99 { 100 if (atomic_dec_and_test(&client->refcount)) 101 complete(&client->comp); 102 } 103 104 void rdma_addr_unregister_client(struct rdma_addr_client *client) 105 { 106 put_client(client); 107 wait_for_completion(&client->comp); 108 } 109 EXPORT_SYMBOL(rdma_addr_unregister_client); 110 111 int 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 } 122 EXPORT_SYMBOL(rdma_copy_addr); 123 124 int 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 } 172 EXPORT_SYMBOL(rdma_translate_ip); 173 174 static void set_timeout(unsigned long time) 175 { 176 unsigned long delay; 177 178 delay = time - jiffies; 179 if ((long)delay < 0) 180 delay = 0; 181 182 mod_delayed_work(addr_wq, &work, delay); 183 } 184 185 static 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 } 201 202 static 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 } 224 225 static 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); 261 put: 262 ip_rt_put(rt); 263 out: 264 return ret; 265 } 266 267 #if IS_ENABLED(CONFIG_IPV6) 268 static 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); 309 put: 310 dst_release(dst); 311 return ret; 312 } 313 #else 314 static 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 321 322 static 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 } 333 334 static 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 } 370 371 int 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; 423 err: 424 kfree(req); 425 return ret; 426 } 427 EXPORT_SYMBOL(rdma_resolve_ip); 428 429 void 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 } 445 EXPORT_SYMBOL(rdma_addr_cancel); 446 447 struct resolve_cb_context { 448 struct rdma_dev_addr *addr; 449 struct completion comp; 450 }; 451 452 static 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 } 459 460 int 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 rdma_gid2ip(&sgid_addr._sockaddr, sgid); 476 rdma_gid2ip(&dgid_addr._sockaddr, dgid); 477 478 memset(&dev_addr, 0, sizeof(dev_addr)); 479 480 ctx.addr = &dev_addr; 481 init_completion(&ctx.comp); 482 ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr, 483 &dev_addr, 1000, resolve_cb, &ctx); 484 if (ret) 485 return ret; 486 487 wait_for_completion(&ctx.comp); 488 489 memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN); 490 dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if); 491 if (!dev) 492 return -ENODEV; 493 if (vlan_id) 494 *vlan_id = rdma_vlan_dev_vlan_id(dev); 495 dev_put(dev); 496 return ret; 497 } 498 EXPORT_SYMBOL(rdma_addr_find_dmac_by_grh); 499 500 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id) 501 { 502 int ret = 0; 503 struct rdma_dev_addr dev_addr; 504 union { 505 struct sockaddr _sockaddr; 506 struct sockaddr_in _sockaddr_in; 507 struct sockaddr_in6 _sockaddr_in6; 508 } gid_addr; 509 510 rdma_gid2ip(&gid_addr._sockaddr, sgid); 511 512 memset(&dev_addr, 0, sizeof(dev_addr)); 513 ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id); 514 if (ret) 515 return ret; 516 517 memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN); 518 return ret; 519 } 520 EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid); 521 522 static int netevent_callback(struct notifier_block *self, unsigned long event, 523 void *ctx) 524 { 525 if (event == NETEVENT_NEIGH_UPDATE) { 526 struct neighbour *neigh = ctx; 527 528 if (neigh->nud_state & NUD_VALID) { 529 set_timeout(jiffies); 530 } 531 } 532 return 0; 533 } 534 535 static struct notifier_block nb = { 536 .notifier_call = netevent_callback 537 }; 538 539 static int __init addr_init(void) 540 { 541 addr_wq = create_singlethread_workqueue("ib_addr"); 542 if (!addr_wq) 543 return -ENOMEM; 544 545 register_netevent_notifier(&nb); 546 rdma_addr_register_client(&self); 547 return 0; 548 } 549 550 static void __exit addr_cleanup(void) 551 { 552 rdma_addr_unregister_client(&self); 553 unregister_netevent_notifier(&nb); 554 destroy_workqueue(addr_wq); 555 } 556 557 module_init(addr_init); 558 module_exit(addr_cleanup); 559