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/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(const union ib_gid *sgid, const union ib_gid *dgid,
 461                                u8 *dmac, 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);