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 #include <rdma/rdma_netlink.h>
  50 #include <net/netlink.h>
  51
  52 #include "core_priv.h"
  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         u32 seq;
  66 };
  67
  68 static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);
  69
  70 static void process_req(struct work_struct *work);
  71
  72 static DEFINE_MUTEX(lock);
  73 static LIST_HEAD(req_list);
  74 static DECLARE_DELAYED_WORK(work, process_req);
  75 static struct workqueue_struct *addr_wq;
  76
  77 static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
  78         [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
  79                 .len = sizeof(struct rdma_nla_ls_gid)},
  80 };
  81
  82 static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
  83 {
  84         struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
  85         int ret;
  86
  87         if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
  88                 return false;
  89
  90         ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
  91                         nlmsg_len(nlh), ib_nl_addr_policy, NULL);
  92         if (ret)
  93                 return false;
  94
  95         return true;
  96 }
  97
  98 static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
  99 {
 100         const struct nlattr *head, *curr;
 101         union ib_gid gid;
 102         struct addr_req *req;
 103         int len, rem;
 104         int found = 0;
 105
 106         head = (const struct nlattr *)nlmsg_data(nlh);
 107         len = nlmsg_len(nlh);
 108
 109         nla_for_each_attr(curr, head, len, rem) {
 110                 if (curr->nla_type == LS_NLA_TYPE_DGID)
 111                         memcpy(&gid, nla_data(curr), nla_len(curr));
 112         }
 113
 114         mutex_lock(&lock);
 115         list_for_each_entry(req, &req_list, list) {
 116                 if (nlh->nlmsg_seq != req->seq)
 117                         continue;
 118                 /* We set the DGID part, the rest was set earlier */
 119                 rdma_addr_set_dgid(req->addr, &gid);
 120                 req->status = 0;
 121                 found = 1;
 122                 break;
 123         }
 124         mutex_unlock(&lock);
 125
 126         if (!found)
 127                 pr_info("Couldn't find request waiting for DGID: %pI6\n",
 128                         &gid);
 129 }
 130
 131 int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
 132                              struct netlink_callback *cb)
 133 {
 134         const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
 135
 136         if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
 137             !(NETLINK_CB(skb).sk) ||
 138             !netlink_capable(skb, CAP_NET_ADMIN))
 139                 return -EPERM;
 140
 141         if (ib_nl_is_good_ip_resp(nlh))
 142                 ib_nl_process_good_ip_rsep(nlh);
 143
 144         return skb->len;
 145 }
 146
 147 static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
 148                              const void *daddr,
 149                              u32 seq, u16 family)
 150 {
 151         struct sk_buff *skb = NULL;
 152         struct nlmsghdr *nlh;
 153         struct rdma_ls_ip_resolve_header *header;
 154         void *data;
 155         size_t size;
 156         int attrtype;
 157         int len;
 158
 159         if (family == AF_INET) {
 160                 size = sizeof(struct in_addr);
 161                 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
 162         } else {
 163                 size = sizeof(struct in6_addr);
 164                 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
 165         }
 166
 167         len = nla_total_size(sizeof(size));
 168         len += NLMSG_ALIGN(sizeof(*header));
 169
 170         skb = nlmsg_new(len, GFP_KERNEL);
 171         if (!skb)
 172                 return -ENOMEM;
 173
 174         data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
 175                             RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
 176         if (!data) {
 177                 nlmsg_free(skb);
 178                 return -ENODATA;
 179         }
 180
 181         /* Construct the family header first */
 182         header = (struct rdma_ls_ip_resolve_header *)
 183                 skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
 184         header->ifindex = dev_addr->bound_dev_if;
 185         nla_put(skb, attrtype, size, daddr);
 186
 187         /* Repair the nlmsg header length */
 188         nlmsg_end(skb, nlh);
 189         ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, GFP_KERNEL);
 190
 191         /* Make the request retry, so when we get the response from userspace
 192          * we will have something.
 193          */
 194         return -ENODATA;
 195 }
 196
 197 int rdma_addr_size(struct sockaddr *addr)
 198 {
 199         switch (addr->sa_family) {
 200         case AF_INET:
 201                 return sizeof(struct sockaddr_in);
 202         case AF_INET6:
 203                 return sizeof(struct sockaddr_in6);
 204         case AF_IB:
 205                 return sizeof(struct sockaddr_ib);
 206         default:
 207                 return 0;
 208         }
 209 }
 210 EXPORT_SYMBOL(rdma_addr_size);
 211
 212 static struct rdma_addr_client self;
 213
 214 void rdma_addr_register_client(struct rdma_addr_client *client)
 215 {
 216         atomic_set(&client->refcount, 1);
 217         init_completion(&client->comp);
 218 }
 219 EXPORT_SYMBOL(rdma_addr_register_client);
 220
 221 static inline void put_client(struct rdma_addr_client *client)
 222 {
 223         if (atomic_dec_and_test(&client->refcount))
 224                 complete(&client->comp);
 225 }
 226
 227 void rdma_addr_unregister_client(struct rdma_addr_client *client)
 228 {
 229         put_client(client);
 230         wait_for_completion(&client->comp);
 231 }
 232 EXPORT_SYMBOL(rdma_addr_unregister_client);
 233
 234 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 235                      const unsigned char *dst_dev_addr)
 236 {
 237         dev_addr->dev_type = dev->type;
 238         memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 239         memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
 240         if (dst_dev_addr)
 241                 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
 242         dev_addr->bound_dev_if = dev->ifindex;
 243         return 0;
 244 }
 245 EXPORT_SYMBOL(rdma_copy_addr);
 246
 247 int rdma_translate_ip(const struct sockaddr *addr,
 248                       struct rdma_dev_addr *dev_addr,
 249                       u16 *vlan_id)
 250 {
 251         struct net_device *dev;
 252         int ret = -EADDRNOTAVAIL;
 253
 254         if (dev_addr->bound_dev_if) {
 255                 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
 256                 if (!dev)
 257                         return -ENODEV;
 258                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 259                 dev_put(dev);
 260                 return ret;
 261         }
 262
 263         switch (addr->sa_family) {
 264         case AF_INET:
 265                 dev = ip_dev_find(dev_addr->net,
 266                         ((const struct sockaddr_in *)addr)->sin_addr.s_addr);
 267
 268                 if (!dev)
 269                         return ret;
 270
 271                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 272                 if (vlan_id)
 273                         *vlan_id = rdma_vlan_dev_vlan_id(dev);
 274                 dev_put(dev);
 275                 break;
 276 #if IS_ENABLED(CONFIG_IPV6)
 277         case AF_INET6:
 278                 rcu_read_lock();
 279                 for_each_netdev_rcu(dev_addr->net, dev) {
 280                         if (ipv6_chk_addr(dev_addr->net,
 281                                           &((const struct sockaddr_in6 *)addr)->sin6_addr,
 282                                           dev, 1)) {
 283                                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 284                                 if (vlan_id)
 285                                         *vlan_id = rdma_vlan_dev_vlan_id(dev);
 286                                 break;
 287                         }
 288                 }
 289                 rcu_read_unlock();
 290                 break;
 291 #endif
 292         }
 293         return ret;
 294 }
 295 EXPORT_SYMBOL(rdma_translate_ip);
 296
 297 static void set_timeout(unsigned long time)
 298 {
 299         unsigned long delay;
 300
 301         delay = time - jiffies;
 302         if ((long)delay < 0)
 303                 delay = 0;
 304
 305         mod_delayed_work(addr_wq, &work, delay);
 306 }
 307
 308 static void queue_req(struct addr_req *req)
 309 {
 310         struct addr_req *temp_req;
 311
 312         mutex_lock(&lock);
 313         list_for_each_entry_reverse(temp_req, &req_list, list) {
 314                 if (time_after_eq(req->timeout, temp_req->timeout))
 315                         break;
 316         }
 317
 318         list_add(&req->list, &temp_req->list);
 319
 320         if (req_list.next == &req->list)
 321                 set_timeout(req->timeout);
 322         mutex_unlock(&lock);
 323 }
 324
 325 static int ib_nl_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 326                           const void *daddr, u32 seq, u16 family)
 327 {
 328         if (ibnl_chk_listeners(RDMA_NL_GROUP_LS))
 329                 return -EADDRNOTAVAIL;
 330
 331         /* We fill in what we can, the response will fill the rest */
 332         rdma_copy_addr(dev_addr, dst->dev, NULL);
 333         return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
 334 }
 335
 336 static int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 337                         const void *daddr)
 338 {
 339         struct neighbour *n;
 340         int ret;
 341
 342         n = dst_neigh_lookup(dst, daddr);
 343
 344         rcu_read_lock();
 345         if (!n || !(n->nud_state & NUD_VALID)) {
 346                 if (n)
 347                         neigh_event_send(n, NULL);
 348                 ret = -ENODATA;
 349         } else {
 350                 ret = rdma_copy_addr(dev_addr, dst->dev, n->ha);
 351         }
 352         rcu_read_unlock();
 353
 354         if (n)
 355                 neigh_release(n);
 356
 357         return ret;
 358 }
 359
 360 static bool has_gateway(struct dst_entry *dst, sa_family_t family)
 361 {
 362         struct rtable *rt;
 363         struct rt6_info *rt6;
 364
 365         if (family == AF_INET) {
 366                 rt = container_of(dst, struct rtable, dst);
 367                 return rt->rt_uses_gateway;
 368         }
 369
 370         rt6 = container_of(dst, struct rt6_info, dst);
 371         return rt6->rt6i_flags & RTF_GATEWAY;
 372 }
 373
 374 static int fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 375                     const struct sockaddr *dst_in, u32 seq)
 376 {
 377         const struct sockaddr_in *dst_in4 =
 378                 (const struct sockaddr_in *)dst_in;
 379         const struct sockaddr_in6 *dst_in6 =
 380                 (const struct sockaddr_in6 *)dst_in;
 381         const void *daddr = (dst_in->sa_family == AF_INET) ?
 382                 (const void *)&dst_in4->sin_addr.s_addr :
 383                 (const void *)&dst_in6->sin6_addr;
 384         sa_family_t family = dst_in->sa_family;
 385
 386         /* Gateway + ARPHRD_INFINIBAND -> IB router */
 387         if (has_gateway(dst, family) && dst->dev->type == ARPHRD_INFINIBAND)
 388                 return ib_nl_fetch_ha(dst, dev_addr, daddr, seq, family);
 389         else
 390                 return dst_fetch_ha(dst, dev_addr, daddr);
 391 }
 392
 393 static int addr4_resolve(struct sockaddr_in *src_in,
 394                          const struct sockaddr_in *dst_in,
 395                          struct rdma_dev_addr *addr,
 396                          struct rtable **prt)
 397 {
 398         __be32 src_ip = src_in->sin_addr.s_addr;
 399         __be32 dst_ip = dst_in->sin_addr.s_addr;
 400         struct rtable *rt;
 401         struct flowi4 fl4;
 402         int ret;
 403
 404         memset(&fl4, 0, sizeof(fl4));
 405         fl4.daddr = dst_ip;
 406         fl4.saddr = src_ip;
 407         fl4.flowi4_oif = addr->bound_dev_if;
 408         rt = ip_route_output_key(addr->net, &fl4);
 409         if (IS_ERR(rt)) {
 410                 ret = PTR_ERR(rt);
 411                 goto out;
 412         }
 413         src_in->sin_family = AF_INET;
 414         src_in->sin_addr.s_addr = fl4.saddr;
 415
 416         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 417          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 418          * type accordingly.
 419          */
 420         if (rt->rt_uses_gateway && rt->dst.dev->type != ARPHRD_INFINIBAND)
 421                 addr->network = RDMA_NETWORK_IPV4;
 422
 423         addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
 424
 425         *prt = rt;
 426         return 0;
 427 out:
 428         return ret;
 429 }
 430
 431 #if IS_ENABLED(CONFIG_IPV6)
 432 static int addr6_resolve(struct sockaddr_in6 *src_in,
 433                          const struct sockaddr_in6 *dst_in,
 434                          struct rdma_dev_addr *addr,
 435                          struct dst_entry **pdst)
 436 {
 437         struct flowi6 fl6;
 438         struct dst_entry *dst;
 439         struct rt6_info *rt;
 440         int ret;
 441
 442         memset(&fl6, 0, sizeof fl6);
 443         fl6.daddr = dst_in->sin6_addr;
 444         fl6.saddr = src_in->sin6_addr;
 445         fl6.flowi6_oif = addr->bound_dev_if;
 446
 447         ret = ipv6_stub->ipv6_dst_lookup(addr->net, NULL, &dst, &fl6);
 448         if (ret < 0)
 449                 return ret;
 450
 451         rt = (struct rt6_info *)dst;
 452         if (ipv6_addr_any(&fl6.saddr)) {
 453                 ret = ipv6_dev_get_saddr(addr->net, ip6_dst_idev(dst)->dev,
 454                                          &fl6.daddr, 0, &fl6.saddr);
 455                 if (ret)
 456                         goto put;
 457
 458                 src_in->sin6_family = AF_INET6;
 459                 src_in->sin6_addr = fl6.saddr;
 460         }
 461
 462         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 463          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 464          * type accordingly.
 465          */
 466         if (rt->rt6i_flags & RTF_GATEWAY &&
 467             ip6_dst_idev(dst)->dev->type != ARPHRD_INFINIBAND)
 468                 addr->network = RDMA_NETWORK_IPV6;
 469
 470         addr->hoplimit = ip6_dst_hoplimit(dst);
 471
 472         *pdst = dst;
 473         return 0;
 474 put:
 475         dst_release(dst);
 476         return ret;
 477 }
 478 #else
 479 static int addr6_resolve(struct sockaddr_in6 *src_in,
 480                          const struct sockaddr_in6 *dst_in,
 481                          struct rdma_dev_addr *addr,
 482                          struct dst_entry **pdst)
 483 {
 484         return -EADDRNOTAVAIL;
 485 }
 486 #endif
 487
 488 static int addr_resolve_neigh(struct dst_entry *dst,
 489                               const struct sockaddr *dst_in,
 490                               struct rdma_dev_addr *addr,
 491                               u32 seq)
 492 {
 493         if (dst->dev->flags & IFF_LOOPBACK) {
 494                 int ret;
 495
 496                 ret = rdma_translate_ip(dst_in, addr, NULL);
 497                 if (!ret)
 498                         memcpy(addr->dst_dev_addr, addr->src_dev_addr,
 499                                MAX_ADDR_LEN);
 500
 501                 return ret;
 502         }
 503
 504         /* If the device doesn't do ARP internally */
 505         if (!(dst->dev->flags & IFF_NOARP))
 506                 return fetch_ha(dst, addr, dst_in, seq);
 507
 508         return rdma_copy_addr(addr, dst->dev, NULL);
 509 }
 510
 511 static int addr_resolve(struct sockaddr *src_in,
 512                         const struct sockaddr *dst_in,
 513                         struct rdma_dev_addr *addr,
 514                         bool resolve_neigh,
 515                         u32 seq)
 516 {
 517         struct net_device *ndev;
 518         struct dst_entry *dst;
 519         int ret;
 520
 521         if (src_in->sa_family == AF_INET) {
 522                 struct rtable *rt = NULL;
 523                 const struct sockaddr_in *dst_in4 =
 524                         (const struct sockaddr_in *)dst_in;
 525
 526                 ret = addr4_resolve((struct sockaddr_in *)src_in,
 527                                     dst_in4, addr, &rt);
 528                 if (ret)
 529                         return ret;
 530
 531                 if (resolve_neigh)
 532                         ret = addr_resolve_neigh(&rt->dst, dst_in, addr, seq);
 533
 534                 ndev = rt->dst.dev;
 535                 dev_hold(ndev);
 536
 537                 ip_rt_put(rt);
 538         } else {
 539                 const struct sockaddr_in6 *dst_in6 =
 540                         (const struct sockaddr_in6 *)dst_in;
 541
 542                 ret = addr6_resolve((struct sockaddr_in6 *)src_in,
 543                                     dst_in6, addr,
 544                                     &dst);
 545                 if (ret)
 546                         return ret;
 547
 548                 if (resolve_neigh)
 549                         ret = addr_resolve_neigh(dst, dst_in, addr, seq);
 550
 551                 ndev = dst->dev;
 552                 dev_hold(ndev);
 553
 554                 dst_release(dst);
 555         }
 556
 557         addr->bound_dev_if = ndev->ifindex;
 558         addr->net = dev_net(ndev);
 559         dev_put(ndev);
 560
 561         return ret;
 562 }
 563
 564 static void process_req(struct work_struct *work)
 565 {
 566         struct addr_req *req, *temp_req;
 567         struct sockaddr *src_in, *dst_in;
 568         struct list_head done_list;
 569
 570         INIT_LIST_HEAD(&done_list);
 571
 572         mutex_lock(&lock);
 573         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 574                 if (req->status == -ENODATA) {
 575                         src_in = (struct sockaddr *) &req->src_addr;
 576                         dst_in = (struct sockaddr *) &req->dst_addr;
 577                         req->status = addr_resolve(src_in, dst_in, req->addr,
 578                                                    true, req->seq);
 579                         if (req->status && time_after_eq(jiffies, req->timeout))
 580                                 req->status = -ETIMEDOUT;
 581                         else if (req->status == -ENODATA)
 582                                 continue;
 583                 }
 584                 list_move_tail(&req->list, &done_list);
 585         }
 586
 587         if (!list_empty(&req_list)) {
 588                 req = list_entry(req_list.next, struct addr_req, list);
 589                 set_timeout(req->timeout);
 590         }
 591         mutex_unlock(&lock);
 592
 593         list_for_each_entry_safe(req, temp_req, &done_list, list) {
 594                 list_del(&req->list);
 595                 req->callback(req->status, (struct sockaddr *) &req->src_addr,
 596                         req->addr, req->context);
 597                 put_client(req->client);
 598                 kfree(req);
 599         }
 600 }
 601
 602 int rdma_resolve_ip(struct rdma_addr_client *client,
 603                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
 604                     struct rdma_dev_addr *addr, int timeout_ms,
 605                     void (*callback)(int status, struct sockaddr *src_addr,
 606                                      struct rdma_dev_addr *addr, void *context),
 607                     void *context)
 608 {
 609         struct sockaddr *src_in, *dst_in;
 610         struct addr_req *req;
 611         int ret = 0;
 612
 613         req = kzalloc(sizeof *req, GFP_KERNEL);
 614         if (!req)
 615                 return -ENOMEM;
 616
 617         src_in = (struct sockaddr *) &req->src_addr;
 618         dst_in = (struct sockaddr *) &req->dst_addr;
 619
 620         if (src_addr) {
 621                 if (src_addr->sa_family != dst_addr->sa_family) {
 622                         ret = -EINVAL;
 623                         goto err;
 624                 }
 625
 626                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 627         } else {
 628                 src_in->sa_family = dst_addr->sa_family;
 629         }
 630
 631         memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
 632         req->addr = addr;
 633         req->callback = callback;
 634         req->context = context;
 635         req->client = client;
 636         atomic_inc(&client->refcount);
 637         req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
 638
 639         req->status = addr_resolve(src_in, dst_in, addr, true, req->seq);
 640         switch (req->status) {
 641         case 0:
 642                 req->timeout = jiffies;
 643                 queue_req(req);
 644                 break;
 645         case -ENODATA:
 646                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
 647                 queue_req(req);
 648                 break;
 649         default:
 650                 ret = req->status;
 651                 atomic_dec(&client->refcount);
 652                 goto err;
 653         }
 654         return ret;
 655 err:
 656         kfree(req);
 657         return ret;
 658 }
 659 EXPORT_SYMBOL(rdma_resolve_ip);
 660
 661 int rdma_resolve_ip_route(struct sockaddr *src_addr,
 662                           const struct sockaddr *dst_addr,
 663                           struct rdma_dev_addr *addr)
 664 {
 665         struct sockaddr_storage ssrc_addr = {};
 666         struct sockaddr *src_in = (struct sockaddr *)&ssrc_addr;
 667
 668         if (src_addr) {
 669                 if (src_addr->sa_family != dst_addr->sa_family)
 670                         return -EINVAL;
 671
 672                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 673         } else {
 674                 src_in->sa_family = dst_addr->sa_family;
 675         }
 676
 677         return addr_resolve(src_in, dst_addr, addr, false, 0);
 678 }
 679 EXPORT_SYMBOL(rdma_resolve_ip_route);
 680
 681 void rdma_addr_cancel(struct rdma_dev_addr *addr)
 682 {
 683         struct addr_req *req, *temp_req;
 684
 685         mutex_lock(&lock);
 686         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 687                 if (req->addr == addr) {
 688                         req->status = -ECANCELED;
 689                         req->timeout = jiffies;
 690                         list_move(&req->list, &req_list);
 691                         set_timeout(req->timeout);
 692                         break;
 693                 }
 694         }
 695         mutex_unlock(&lock);
 696 }
 697 EXPORT_SYMBOL(rdma_addr_cancel);
 698
 699 struct resolve_cb_context {
 700         struct rdma_dev_addr *addr;
 701         struct completion comp;
 702         int status;
 703 };
 704
 705 static void resolve_cb(int status, struct sockaddr *src_addr,
 706              struct rdma_dev_addr *addr, void *context)
 707 {
 708         if (!status)
 709                 memcpy(((struct resolve_cb_context *)context)->addr,
 710                        addr, sizeof(struct rdma_dev_addr));
 711         ((struct resolve_cb_context *)context)->status = status;
 712         complete(&((struct resolve_cb_context *)context)->comp);
 713 }
 714
 715 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 716                                  const union ib_gid *dgid,
 717                                  u8 *dmac, u16 *vlan_id, int *if_index,
 718                                  int *hoplimit)
 719 {
 720         int ret = 0;
 721         struct rdma_dev_addr dev_addr;
 722         struct resolve_cb_context ctx;
 723         struct net_device *dev;
 724
 725         union {
 726                 struct sockaddr     _sockaddr;
 727                 struct sockaddr_in  _sockaddr_in;
 728                 struct sockaddr_in6 _sockaddr_in6;
 729         } sgid_addr, dgid_addr;
 730
 731
 732         rdma_gid2ip(&sgid_addr._sockaddr, sgid);
 733         rdma_gid2ip(&dgid_addr._sockaddr, dgid);
 734
 735         memset(&dev_addr, 0, sizeof(dev_addr));
 736         if (if_index)
 737                 dev_addr.bound_dev_if = *if_index;
 738         dev_addr.net = &init_net;
 739
 740         ctx.addr = &dev_addr;
 741         init_completion(&ctx.comp);
 742         ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
 743                         &dev_addr, 1000, resolve_cb, &ctx);
 744         if (ret)
 745                 return ret;
 746
 747         wait_for_completion(&ctx.comp);
 748
 749         ret = ctx.status;
 750         if (ret)
 751                 return ret;
 752
 753         memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
 754         dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if);
 755         if (!dev)
 756                 return -ENODEV;
 757         if (if_index)
 758                 *if_index = dev_addr.bound_dev_if;
 759         if (vlan_id)
 760                 *vlan_id = rdma_vlan_dev_vlan_id(dev);
 761         if (hoplimit)
 762                 *hoplimit = dev_addr.hoplimit;
 763         dev_put(dev);
 764         return ret;
 765 }
 766 EXPORT_SYMBOL(rdma_addr_find_l2_eth_by_grh);
 767
 768 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id)
 769 {
 770         int ret = 0;
 771         struct rdma_dev_addr dev_addr;
 772         union {
 773                 struct sockaddr     _sockaddr;
 774                 struct sockaddr_in  _sockaddr_in;
 775                 struct sockaddr_in6 _sockaddr_in6;
 776         } gid_addr;
 777
 778         rdma_gid2ip(&gid_addr._sockaddr, sgid);
 779
 780         memset(&dev_addr, 0, sizeof(dev_addr));
 781         dev_addr.net = &init_net;
 782         ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id);
 783         if (ret)
 784                 return ret;
 785
 786         memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN);
 787         return ret;
 788 }
 789 EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid);
 790
 791 static int netevent_callback(struct notifier_block *self, unsigned long event,
 792         void *ctx)
 793 {
 794         if (event == NETEVENT_NEIGH_UPDATE) {
 795                 struct neighbour *neigh = ctx;
 796
 797                 if (neigh->nud_state & NUD_VALID) {
 798                         set_timeout(jiffies);
 799                 }
 800         }
 801         return 0;
 802 }
 803
 804 static struct notifier_block nb = {
 805         .notifier_call = netevent_callback
 806 };
 807
 808 int addr_init(void)
 809 {
 810         addr_wq = alloc_workqueue("ib_addr", WQ_MEM_RECLAIM, 0);
 811         if (!addr_wq)
 812                 return -ENOMEM;
 813
 814         register_netevent_notifier(&nb);
 815         rdma_addr_register_client(&self);
 816
 817         return 0;
 818 }
 819
 820 void addr_cleanup(void)
 821 {
 822         rdma_addr_unregister_client(&self);
 823         unregister_netevent_notifier(&nb);
 824         destroy_workqueue(addr_wq);
 825 }