drivers/infiniband/core/addr.c

   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/workqueue.h>
  39 #include <linux/if_arp.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
  48 MODULE_AUTHOR("Sean Hefty");
  49 MODULE_DESCRIPTION("IB Address Translation");
  50 MODULE_LICENSE("Dual BSD/GPL");
  51
  52 struct 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
  65 static void process_req(struct work_struct *work);
  66
  67 static DEFINE_MUTEX(lock);
  68 static LIST_HEAD(req_list);
  69 static DECLARE_DELAYED_WORK(work, process_req);
  70 static struct workqueue_struct *addr_wq;
  71
  72 void rdma_addr_register_client(struct rdma_addr_client *client)
  73 {
  74         atomic_set(&client->refcount, 1);
  75         init_completion(&client->comp);
  76 }
  77 EXPORT_SYMBOL(rdma_addr_register_client);
  78
  79 static inline void put_client(struct rdma_addr_client *client)
  80 {
  81         if (atomic_dec_and_test(&client->refcount))
  82                 complete(&client->comp);
  83 }
  84
  85 void rdma_addr_unregister_client(struct rdma_addr_client *client)
  86 {
  87         put_client(client);
  88         wait_for_completion(&client->comp);
  89 }
  90 EXPORT_SYMBOL(rdma_addr_unregister_client);
  91
  92 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
  93                      const unsigned char *dst_dev_addr)
  94 {
  95         switch (dev->type) {
  96         case ARPHRD_INFINIBAND:
  97                 dev_addr->dev_type = RDMA_NODE_IB_CA;
  98                 break;
  99         case ARPHRD_ETHER:
 100                 dev_addr->dev_type = RDMA_NODE_RNIC;
 101                 break;
 102         default:
 103                 return -EADDRNOTAVAIL;
 104         }
 105
 106         memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 107         memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
 108         if (dst_dev_addr)
 109                 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
 110         dev_addr->src_dev = dev;
 111         return 0;
 112 }
 113 EXPORT_SYMBOL(rdma_copy_addr);
 114
 115 int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
 116 {
 117         struct net_device *dev;
 118         int ret = -EADDRNOTAVAIL;
 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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 133         case AF_INET6:
 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                 break;
 143 #endif
 144         }
 145         return ret;
 146 }
 147 EXPORT_SYMBOL(rdma_translate_ip);
 148
 149 static void set_timeout(unsigned long time)
 150 {
 151         unsigned long delay;
 152
 153         cancel_delayed_work(&work);
 154
 155         delay = time - jiffies;
 156         if ((long)delay <= 0)
 157                 delay = 1;
 158
 159         queue_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 void addr_send_arp(struct sockaddr *dst_in)
 180 {
 181         struct rtable *rt;
 182         struct flowi fl;
 183
 184         memset(&fl, 0, sizeof fl);
 185
 186         switch (dst_in->sa_family) {
 187         case AF_INET:
 188                 fl.nl_u.ip4_u.daddr =
 189                         ((struct sockaddr_in *) dst_in)->sin_addr.s_addr;
 190
 191                 if (ip_route_output_key(&init_net, &rt, &fl))
 192                         return;
 193
 194                 neigh_event_send(rt->u.dst.neighbour, NULL);
 195                 ip_rt_put(rt);
 196                 break;
 197
 198 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 199         case AF_INET6:
 200         {
 201                 struct dst_entry *dst;
 202
 203                 fl.nl_u.ip6_u.daddr =
 204                         ((struct sockaddr_in6 *) dst_in)->sin6_addr;
 205
 206                 dst = ip6_route_output(&init_net, NULL, &fl);
 207                 if (!dst)
 208                         return;
 209
 210                 neigh_event_send(dst->neighbour, NULL);
 211                 dst_release(dst);
 212                 break;
 213         }
 214 #endif
 215         }
 216 }
 217
 218 static int addr4_resolve_remote(struct sockaddr_in *src_in,
 219                                struct sockaddr_in *dst_in,
 220                                struct rdma_dev_addr *addr)
 221 {
 222         __be32 src_ip = src_in->sin_addr.s_addr;
 223         __be32 dst_ip = dst_in->sin_addr.s_addr;
 224         struct flowi fl;
 225         struct rtable *rt;
 226         struct neighbour *neigh;
 227         int ret;
 228
 229         memset(&fl, 0, sizeof fl);
 230         fl.nl_u.ip4_u.daddr = dst_ip;
 231         fl.nl_u.ip4_u.saddr = src_ip;
 232         ret = ip_route_output_key(&init_net, &rt, &fl);
 233         if (ret)
 234                 goto out;
 235
 236         /* If the device does ARP internally, return 'done' */
 237         if (rt->idev->dev->flags & IFF_NOARP) {
 238                 rdma_copy_addr(addr, rt->idev->dev, NULL);
 239                 goto put;
 240         }
 241
 242         neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->idev->dev);
 243         if (!neigh) {
 244                 ret = -ENODATA;
 245                 goto put;
 246         }
 247
 248         if (!(neigh->nud_state & NUD_VALID)) {
 249                 ret = -ENODATA;
 250                 goto release;
 251         }
 252
 253         if (!src_ip) {
 254                 src_in->sin_family = dst_in->sin_family;
 255                 src_in->sin_addr.s_addr = rt->rt_src;
 256         }
 257
 258         ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
 259 release:
 260         neigh_release(neigh);
 261 put:
 262         ip_rt_put(rt);
 263 out:
 264         return ret;
 265 }
 266
 267 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 268 static int addr6_resolve_remote(struct sockaddr_in6 *src_in,
 269                                struct sockaddr_in6 *dst_in,
 270                                struct rdma_dev_addr *addr)
 271 {
 272         struct flowi fl;
 273         struct neighbour *neigh;
 274         struct dst_entry *dst;
 275         int ret = -ENODATA;
 276
 277         memset(&fl, 0, sizeof fl);
 278         fl.nl_u.ip6_u.daddr = dst_in->sin6_addr;
 279         fl.nl_u.ip6_u.saddr = src_in->sin6_addr;
 280
 281         dst = ip6_route_output(&init_net, NULL, &fl);
 282         if (!dst)
 283                 return ret;
 284
 285         if (dst->dev->flags & IFF_NOARP) {
 286                 ret = rdma_copy_addr(addr, dst->dev, NULL);
 287         } else {
 288                 neigh = dst->neighbour;
 289                 if (neigh && (neigh->nud_state & NUD_VALID))
 290                         ret = rdma_copy_addr(addr, neigh->dev, neigh->ha);
 291         }
 292
 293         dst_release(dst);
 294         return ret;
 295 }
 296 #else
 297 static int addr6_resolve_remote(struct sockaddr_in6 *src_in,
 298                                struct sockaddr_in6 *dst_in,
 299                                struct rdma_dev_addr *addr)
 300 {
 301         return -EADDRNOTAVAIL;
 302 }
 303 #endif
 304
 305 static int addr_resolve_remote(struct sockaddr *src_in,
 306                                 struct sockaddr *dst_in,
 307                                 struct rdma_dev_addr *addr)
 308 {
 309         if (src_in->sa_family == AF_INET) {
 310                 return addr4_resolve_remote((struct sockaddr_in *) src_in,
 311                         (struct sockaddr_in *) dst_in, addr);
 312         } else
 313                 return addr6_resolve_remote((struct sockaddr_in6 *) src_in,
 314                         (struct sockaddr_in6 *) dst_in, addr);
 315 }
 316
 317 static void process_req(struct work_struct *work)
 318 {
 319         struct addr_req *req, *temp_req;
 320         struct sockaddr *src_in, *dst_in;
 321         struct list_head done_list;
 322
 323         INIT_LIST_HEAD(&done_list);
 324
 325         mutex_lock(&lock);
 326         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 327                 if (req->status == -ENODATA) {
 328                         src_in = (struct sockaddr *) &req->src_addr;
 329                         dst_in = (struct sockaddr *) &req->dst_addr;
 330                         req->status = addr_resolve_remote(src_in, dst_in,
 331                                                           req->addr);
 332                         if (req->status && time_after_eq(jiffies, req->timeout))
 333                                 req->status = -ETIMEDOUT;
 334                         else if (req->status == -ENODATA)
 335                                 continue;
 336                 }
 337                 list_move_tail(&req->list, &done_list);
 338         }
 339
 340         if (!list_empty(&req_list)) {
 341                 req = list_entry(req_list.next, struct addr_req, list);
 342                 set_timeout(req->timeout);
 343         }
 344         mutex_unlock(&lock);
 345
 346         list_for_each_entry_safe(req, temp_req, &done_list, list) {
 347                 list_del(&req->list);
 348                 req->callback(req->status, (struct sockaddr *) &req->src_addr,
 349                         req->addr, req->context);
 350                 put_client(req->client);
 351                 kfree(req);
 352         }
 353 }
 354
 355 static int addr_resolve_local(struct sockaddr *src_in,
 356                               struct sockaddr *dst_in,
 357                               struct rdma_dev_addr *addr)
 358 {
 359         struct net_device *dev;
 360         int ret;
 361
 362         switch (dst_in->sa_family) {
 363         case AF_INET:
 364         {
 365                 __be32 src_ip = ((struct sockaddr_in *) src_in)->sin_addr.s_addr;
 366                 __be32 dst_ip = ((struct sockaddr_in *) dst_in)->sin_addr.s_addr;
 367
 368                 dev = ip_dev_find(&init_net, dst_ip);
 369                 if (!dev)
 370                         return -EADDRNOTAVAIL;
 371
 372                 if (ipv4_is_zeronet(src_ip)) {
 373                         src_in->sa_family = dst_in->sa_family;
 374                         ((struct sockaddr_in *) src_in)->sin_addr.s_addr = dst_ip;
 375                         ret = rdma_copy_addr(addr, dev, dev->dev_addr);
 376                 } else if (ipv4_is_loopback(src_ip)) {
 377                         ret = rdma_translate_ip(dst_in, addr);
 378                         if (!ret)
 379                                 memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 380                 } else {
 381                         ret = rdma_translate_ip(src_in, addr);
 382                         if (!ret)
 383                                 memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 384                 }
 385                 dev_put(dev);
 386                 break;
 387         }
 388
 389 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 390         case AF_INET6:
 391         {
 392                 struct in6_addr *a;
 393
 394                 for_each_netdev(&init_net, dev)
 395                         if (ipv6_chk_addr(&init_net,
 396                                           &((struct sockaddr_in6 *) addr)->sin6_addr,
 397                                           dev, 1))
 398                                 break;
 399
 400                 if (!dev)
 401                         return -EADDRNOTAVAIL;
 402
 403                 a = &((struct sockaddr_in6 *) src_in)->sin6_addr;
 404
 405                 if (ipv6_addr_any(a)) {
 406                         src_in->sa_family = dst_in->sa_family;
 407                         ((struct sockaddr_in6 *) src_in)->sin6_addr =
 408                                 ((struct sockaddr_in6 *) dst_in)->sin6_addr;
 409                         ret = rdma_copy_addr(addr, dev, dev->dev_addr);
 410                 } else if (ipv6_addr_loopback(a)) {
 411                         ret = rdma_translate_ip(dst_in, addr);
 412                         if (!ret)
 413                                 memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 414                 } else  {
 415                         ret = rdma_translate_ip(src_in, addr);
 416                         if (!ret)
 417                                 memcpy(addr->dst_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 418                 }
 419                 break;
 420         }
 421 #endif
 422
 423         default:
 424                 ret = -EADDRNOTAVAIL;
 425                 break;
 426         }
 427
 428         return ret;
 429 }
 430
 431 int rdma_resolve_ip(struct rdma_addr_client *client,
 432                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
 433                     struct rdma_dev_addr *addr, int timeout_ms,
 434                     void (*callback)(int status, struct sockaddr *src_addr,
 435                                      struct rdma_dev_addr *addr, void *context),
 436                     void *context)
 437 {
 438         struct sockaddr *src_in, *dst_in;
 439         struct addr_req *req;
 440         int ret = 0;
 441
 442         req = kzalloc(sizeof *req, GFP_KERNEL);
 443         if (!req)
 444                 return -ENOMEM;
 445
 446         if (src_addr)
 447                 memcpy(&req->src_addr, src_addr, ip_addr_size(src_addr));
 448         memcpy(&req->dst_addr, dst_addr, ip_addr_size(dst_addr));
 449         req->addr = addr;
 450         req->callback = callback;
 451         req->context = context;
 452         req->client = client;
 453         atomic_inc(&client->refcount);
 454
 455         src_in = (struct sockaddr *) &req->src_addr;
 456         dst_in = (struct sockaddr *) &req->dst_addr;
 457
 458         req->status = addr_resolve_local(src_in, dst_in, addr);
 459         if (req->status == -EADDRNOTAVAIL)
 460                 req->status = addr_resolve_remote(src_in, dst_in, addr);
 461
 462         switch (req->status) {
 463         case 0:
 464                 req->timeout = jiffies;
 465                 queue_req(req);
 466                 break;
 467         case -ENODATA:
 468                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
 469                 queue_req(req);
 470                 addr_send_arp(dst_in);
 471                 break;
 472         default:
 473                 ret = req->status;
 474                 atomic_dec(&client->refcount);
 475                 kfree(req);
 476                 break;
 477         }
 478         return ret;
 479 }
 480 EXPORT_SYMBOL(rdma_resolve_ip);
 481
 482 void rdma_addr_cancel(struct rdma_dev_addr *addr)
 483 {
 484         struct addr_req *req, *temp_req;
 485
 486         mutex_lock(&lock);
 487         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 488                 if (req->addr == addr) {
 489                         req->status = -ECANCELED;
 490                         req->timeout = jiffies;
 491                         list_move(&req->list, &req_list);
 492                         set_timeout(req->timeout);
 493                         break;
 494                 }
 495         }
 496         mutex_unlock(&lock);
 497 }
 498 EXPORT_SYMBOL(rdma_addr_cancel);
 499
 500 static int netevent_callback(struct notifier_block *self, unsigned long event,
 501         void *ctx)
 502 {
 503         if (event == NETEVENT_NEIGH_UPDATE) {
 504                 struct neighbour *neigh = ctx;
 505
 506                 if (neigh->nud_state & NUD_VALID) {
 507                         set_timeout(jiffies);
 508                 }
 509         }
 510         return 0;
 511 }
 512
 513 static struct notifier_block nb = {
 514         .notifier_call = netevent_callback
 515 };
 516
 517 static int __init addr_init(void)
 518 {
 519         addr_wq = create_singlethread_workqueue("ib_addr");
 520         if (!addr_wq)
 521                 return -ENOMEM;
 522
 523         register_netevent_notifier(&nb);
 524         return 0;
 525 }
 526
 527 static void __exit addr_cleanup(void)
 528 {
 529         unregister_netevent_notifier(&nb);
 530         destroy_workqueue(addr_wq);
 531 }
 532
 533 module_init(addr_init);
 534 module_exit(addr_cleanup);