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 read_lock(&dev_base_lock); 134 for_each_netdev(&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 read_unlock(&dev_base_lock); 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 flowi fl; 187 struct rtable *rt; 188 struct neighbour *neigh; 189 int ret; 190 191 memset(&fl, 0, sizeof fl); 192 fl.nl_u.ip4_u.daddr = dst_ip; 193 fl.nl_u.ip4_u.saddr = src_ip; 194 fl.oif = addr->bound_dev_if; 195 196 ret = ip_route_output_key(&init_net, &rt, &fl); 197 if (ret) 198 goto out; 199 200 src_in->sin_family = AF_INET; 201 src_in->sin_addr.s_addr = rt->rt_src; 202 203 if (rt->idev->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->idev->dev->flags & IFF_NOARP) { 212 rdma_copy_addr(addr, rt->idev->dev, NULL); 213 goto put; 214 } 215 216 neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev); 217 if (!neigh || !(neigh->nud_state & NUD_VALID)) { 218 neigh_event_send(rt->dst.neighbour, NULL); 219 ret = -ENODATA; 220 if (neigh) 221 goto release; 222 goto put; 223 } 224 225 ret = rdma_copy_addr(addr, neigh->dev, neigh->ha); 226release: 227 neigh_release(neigh); 228put: 229 ip_rt_put(rt); 230out: 231 return ret; 232} 233 234#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 235static int addr6_resolve(struct sockaddr_in6 *src_in, 236 struct sockaddr_in6 *dst_in, 237 struct rdma_dev_addr *addr) 238{ 239 struct flowi fl; 240 struct neighbour *neigh; 241 struct dst_entry *dst; 242 int ret; 243 244 memset(&fl, 0, sizeof fl); 245 ipv6_addr_copy(&fl.fl6_dst, &dst_in->sin6_addr); 246 ipv6_addr_copy(&fl.fl6_src, &src_in->sin6_addr); 247 fl.oif = addr->bound_dev_if; 248 249 dst = ip6_route_output(&init_net, NULL, &fl); 250 if ((ret = dst->error)) 251 goto put; 252 253 if (ipv6_addr_any(&fl.fl6_src)) { 254 ret = ipv6_dev_get_saddr(&init_net, ip6_dst_idev(dst)->dev, 255 &fl.fl6_dst, 0, &fl.fl6_src); 256 if (ret) 257 goto put; 258 259 src_in->sin6_family = AF_INET6; 260 ipv6_addr_copy(&src_in->sin6_addr, &fl.fl6_src); 261 } 262 263 if (dst->dev->flags & IFF_LOOPBACK) { 264 ret = rdma_translate_ip((struct sockaddr *) dst_in, addr); 265 if (!ret) 266 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN); 267 goto put; 268 } 269 270 /* If the device does ARP internally, return 'done' */ 271 if (dst->dev->flags & IFF_NOARP) { 272 ret = rdma_copy_addr(addr, dst->dev, NULL); 273 goto put; 274 } 275 276 neigh = dst->neighbour; 277 if (!neigh || !(neigh->nud_state & NUD_VALID)) { 278 neigh_event_send(dst->neighbour, NULL); 279 ret = -ENODATA; 280 goto put; 281 } 282 283 ret = rdma_copy_addr(addr, dst->dev, neigh->ha); 284put: 285 dst_release(dst); 286 return ret; 287} 288#else 289static 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 297static 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 309static 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 346int 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; 398err: 399 kfree(req); 400 return ret; 401} 402EXPORT_SYMBOL(rdma_resolve_ip); 403 404void 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} 420EXPORT_SYMBOL(rdma_addr_cancel); 421 422static 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 435static struct notifier_block nb = { 436 .notifier_call = netevent_callback 437}; 438 439static 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 449static void __exit addr_cleanup(void) 450{ 451 unregister_netevent_notifier(&nb); 452 destroy_workqueue(addr_wq); 453} 454 455module_init(addr_init); 456module_exit(addr_cleanup); 457