/drivers/infiniband/core/addr.c
C | 460 lines | 365 code | 59 blank | 36 comment | 52 complexity | 24b8e7b55c39d8eded34f03b18477b4d MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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 <net/arp.h> 41#include <net/neighbour.h> 42#include <net/route.h> 43#include <net/netevent.h> 44#include <net/addrconf.h> 45#include <net/ip6_route.h> 46#include <rdma/ib_addr.h> 47 48MODULE_AUTHOR("Sean Hefty"); 49MODULE_DESCRIPTION("IB Address Translation"); 50MODULE_LICENSE("Dual BSD/GPL"); 51 52struct addr_req { 53 struct list_head list; 54 struct sockaddr_storage src_addr; 55 struct sockaddr_storage dst_addr; 56 struct rdma_dev_addr *addr; 57 struct rdma_addr_client *client; 58 void *context; 59 void (*callback)(int status, struct sockaddr *src_addr, 60 struct rdma_dev_addr *addr, void *context); 61 unsigned long timeout; 62 int status; 63}; 64 65static void process_req(struct work_struct *work); 66 67static DEFINE_MUTEX(lock); 68static LIST_HEAD(req_list); 69static DECLARE_DELAYED_WORK(work, process_req); 70static struct workqueue_struct *addr_wq; 71 72void rdma_addr_register_client(struct rdma_addr_client *client) 73{ 74 atomic_set(&client->refcount, 1); 75 init_completion(&client->comp); 76} 77EXPORT_SYMBOL(rdma_addr_register_client); 78 79static inline void put_client(struct rdma_addr_client *client) 80{ 81 if (atomic_dec_and_test(&client->refcount)) 82 complete(&client->comp); 83} 84 85void rdma_addr_unregister_client(struct rdma_addr_client *client) 86{ 87 put_client(client); 88 wait_for_completion(&client->comp); 89} 90EXPORT_SYMBOL(rdma_addr_unregister_client); 91 92int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev, 93 const unsigned char *dst_dev_addr) 94{ 95 dev_addr->dev_type = dev->type; 96 memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN); 97 memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN); 98 if (dst_dev_addr) 99 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN); 100 dev_addr->bound_dev_if = dev->ifindex; 101 return 0; 102} 103EXPORT_SYMBOL(rdma_copy_addr); 104 105int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr) 106{ 107 struct net_device *dev; 108 int ret = -EADDRNOTAVAIL; 109 110 if (dev_addr->bound_dev_if) { 111 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if); 112 if (!dev) 113 return -ENODEV; 114 ret = rdma_copy_addr(dev_addr, dev, NULL); 115 dev_put(dev); 116 return ret; 117 } 118 119 switch (addr->sa_family) { 120 case AF_INET: 121 dev = ip_dev_find(&init_net, 122 ((struct sockaddr_in *) addr)->sin_addr.s_addr); 123 124 if (!dev) 125 return ret; 126 127 ret = rdma_copy_addr(dev_addr, dev, NULL); 128 dev_put(dev); 129 break; 130 131#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 132 case AF_INET6: 133 rcu_read_lock(); 134 for_each_netdev_rcu(&init_net, dev) { 135 if (ipv6_chk_addr(&init_net, 136 &((struct sockaddr_in6 *) addr)->sin6_addr, 137 dev, 1)) { 138 ret = rdma_copy_addr(dev_addr, dev, NULL); 139 break; 140 } 141 } 142 rcu_read_unlock(); 143 break; 144#endif 145 } 146 return ret; 147} 148EXPORT_SYMBOL(rdma_translate_ip); 149 150static void set_timeout(unsigned long time) 151{ 152 unsigned long delay; 153 154 cancel_delayed_work(&work); 155 156 delay = time - jiffies; 157 if ((long)delay <= 0) 158 delay = 1; 159 160 queue_delayed_work(addr_wq, &work, delay); 161} 162 163static void queue_req(struct addr_req *req) 164{ 165 struct addr_req *temp_req; 166 167 mutex_lock(&lock); 168 list_for_each_entry_reverse(temp_req, &req_list, list) { 169 if (time_after_eq(req->timeout, temp_req->timeout)) 170 break; 171 } 172 173 list_add(&req->list, &temp_req->list); 174 175 if (req_list.next == &req->list) 176 set_timeout(req->timeout); 177 mutex_unlock(&lock); 178} 179 180static int addr4_resolve(struct sockaddr_in *src_in, 181 struct sockaddr_in *dst_in, 182 struct rdma_dev_addr *addr) 183{ 184 __be32 src_ip = src_in->sin_addr.s_addr; 185 __be32 dst_ip = dst_in->sin_addr.s_addr; 186 struct rtable *rt; 187 struct neighbour *neigh; 188 struct flowi4 fl4; 189 int ret; 190 191 memset(&fl4, 0, sizeof(fl4)); 192 fl4.daddr = dst_ip; 193 fl4.saddr = src_ip; 194 fl4.flowi4_oif = addr->bound_dev_if; 195 rt = ip_route_output_key(&init_net, &fl4); 196 if (IS_ERR(rt)) { 197 ret = PTR_ERR(rt); 198 goto out; 199 } 200 src_in->sin_family = AF_INET; 201 src_in->sin_addr.s_addr = fl4.saddr; 202 203 if (rt->dst.dev->flags & IFF_LOOPBACK) { 204 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); 205 if (!ret) 206 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); 207 goto put; 208 } 209 210 /* If the device does ARP internally, return 'done' */ 211 if (rt->dst.dev->flags & IFF_NOARP) { 212 ret = rdma_copy_addr(addr, rt->dst.dev, NULL); 213 goto put; 214 } 215 216 neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->dst.dev); 217 if (!neigh || !(neigh->nud_state & NUD_VALID)) { 218 rcu_read_lock(); 219 neigh_event_send(dst_get_neighbour(&rt->dst), NULL); 220 rcu_read_unlock(); 221 ret = -ENODATA; 222 if (neigh) 223 goto release; 224 goto put; 225 } 226 227 ret = rdma_copy_addr(addr, neigh->dev, neigh->ha); 228release: 229 neigh_release(neigh); 230put: 231 ip_rt_put(rt); 232out: 233 return ret; 234} 235 236#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 237static int addr6_resolve(struct sockaddr_in6 *src_in, 238 struct sockaddr_in6 *dst_in, 239 struct rdma_dev_addr *addr) 240{ 241 struct flowi6 fl6; 242 struct neighbour *neigh; 243 struct dst_entry *dst; 244 int ret; 245 246 memset(&fl6, 0, sizeof fl6); 247 ipv6_addr_copy(&fl6.daddr, &dst_in->sin6_addr); 248 ipv6_addr_copy(&fl6.saddr, &src_in->sin6_addr); 249 fl6.flowi6_oif = addr->bound_dev_if; 250 251 dst = ip6_route_output(&init_net, NULL, &fl6); 252 if ((ret = dst->error)) 253 goto put; 254 255 if (ipv6_addr_any(&fl6.saddr)) { 256 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev, 257 &fl6.daddr, 0, &fl6.saddr); 258 if (ret) 259 goto put; 260 261 src_in->sin6_family = AF_INET6; 262 ipv6_addr_copy(&src_in->sin6_addr, &fl6.saddr); 263 } 264 265 if (dst->dev->flags & IFF_LOOPBACK) { 266 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); 267 if (!ret) 268 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); 269 goto put; 270 } 271 272 /* If the device does ARP internally, return 'done' */ 273 if (dst->dev->flags & IFF_NOARP) { 274 ret = rdma_copy_addr(addr, dst->dev, NULL); 275 goto put; 276 } 277 278 rcu_read_lock(); 279 neigh = dst_get_neighbour(dst); 280 if (!neigh || !(neigh->nud_state & NUD_VALID)) { 281 if (neigh) 282 neigh_event_send(neigh, NULL); 283 ret = -ENODATA; 284 } else { 285 ret = rdma_copy_addr(addr, dst->dev, neigh->ha); 286 } 287 rcu_read_unlock(); 288put: 289 dst_release(dst); 290 return ret; 291} 292#else 293static 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 301static 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 313static 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 350int 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; 402err: 403 kfree(req); 404 return ret; 405} 406EXPORT_SYMBOL(rdma_resolve_ip); 407 408void 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} 424EXPORT_SYMBOL(rdma_addr_cancel); 425 426static 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 439static struct notifier_block nb = { 440 .notifier_call = netevent_callback 441}; 442 443static 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 453static void __exit addr_cleanup(void) 454{ 455 unregister_netevent_notifier(&nb); 456 destroy_workqueue(addr_wq); 457} 458 459module_init(addr_init); 460module_exit(addr_cleanup);