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         struct delayed_work work;
  65         int status;
  66         u32 seq;
  67 };
  68
  69 static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);
  70
  71 static void process_req(struct work_struct *work);
  72
  73 static DEFINE_MUTEX(lock);
  74 static LIST_HEAD(req_list);
  75 static DECLARE_DELAYED_WORK(work, process_req);
  76 static struct workqueue_struct *addr_wq;
  77
  78 static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
  79         [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
  80                 .len = sizeof(struct rdma_nla_ls_gid)},
  81 };
  82
  83 static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
  84 {
  85         struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
  86         int ret;
  87
  88         if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
  89                 return false;
  90
  91         ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
  92                         nlmsg_len(nlh), ib_nl_addr_policy, NULL);
  93         if (ret)
  94                 return false;
  95
  96         return true;
  97 }
  98
  99 static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
 100 {
 101         const struct nlattr *head, *curr;
 102         union ib_gid gid;
 103         struct addr_req *req;
 104         int len, rem;
 105         int found = 0;
 106
 107         head = (const struct nlattr *)nlmsg_data(nlh);
 108         len = nlmsg_len(nlh);
 109
 110         nla_for_each_attr(curr, head, len, rem) {
 111                 if (curr->nla_type == LS_NLA_TYPE_DGID)
 112                         memcpy(&gid, nla_data(curr), nla_len(curr));
 113         }
 114
 115         mutex_lock(&lock);
 116         list_for_each_entry(req, &req_list, list) {
 117                 if (nlh->nlmsg_seq != req->seq)
 118                         continue;
 119                 /* We set the DGID part, the rest was set earlier */
 120                 rdma_addr_set_dgid(req->addr, &gid);
 121                 req->status = 0;
 122                 found = 1;
 123                 break;
 124         }
 125         mutex_unlock(&lock);
 126
 127         if (!found)
 128                 pr_info("Couldn't find request waiting for DGID: %pI6\n",
 129                         &gid);
 130 }
 131
 132 int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
 133                              struct netlink_callback *cb)
 134 {
 135         const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
 136
 137         if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
 138             !(NETLINK_CB(skb).sk) ||
 139             !netlink_capable(skb, CAP_NET_ADMIN))
 140                 return -EPERM;
 141
 142         if (ib_nl_is_good_ip_resp(nlh))
 143                 ib_nl_process_good_ip_rsep(nlh);
 144
 145         return skb->len;
 146 }
 147
 148 static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
 149                              const void *daddr,
 150                              u32 seq, u16 family)
 151 {
 152         struct sk_buff *skb = NULL;
 153         struct nlmsghdr *nlh;
 154         struct rdma_ls_ip_resolve_header *header;
 155         void *data;
 156         size_t size;
 157         int attrtype;
 158         int len;
 159
 160         if (family == AF_INET) {
 161                 size = sizeof(struct in_addr);
 162                 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
 163         } else {
 164                 size = sizeof(struct in6_addr);
 165                 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
 166         }
 167
 168         len = nla_total_size(sizeof(size));
 169         len += NLMSG_ALIGN(sizeof(*header));
 170
 171         skb = nlmsg_new(len, GFP_KERNEL);
 172         if (!skb)
 173                 return -ENOMEM;
 174
 175         data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
 176                             RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
 177         if (!data) {
 178                 nlmsg_free(skb);
 179                 return -ENODATA;
 180         }
 181
 182         /* Construct the family header first */
 183         header = 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                 dev_addr->bound_dev_if = dev->ifindex;
 273                 if (vlan_id)
 274                         *vlan_id = rdma_vlan_dev_vlan_id(dev);
 275                 dev_put(dev);
 276                 break;
 277 #if IS_ENABLED(CONFIG_IPV6)
 278         case AF_INET6:
 279                 rcu_read_lock();
 280                 for_each_netdev_rcu(dev_addr->net, dev) {
 281                         if (ipv6_chk_addr(dev_addr->net,
 282                                           &((const struct sockaddr_in6 *)addr)->sin6_addr,
 283                                           dev, 1)) {
 284                                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 285                                 dev_addr->bound_dev_if = dev->ifindex;
 286                                 if (vlan_id)
 287                                         *vlan_id = rdma_vlan_dev_vlan_id(dev);
 288                                 break;
 289                         }
 290                 }
 291                 rcu_read_unlock();
 292                 break;
 293 #endif
 294         }
 295         return ret;
 296 }
 297 EXPORT_SYMBOL(rdma_translate_ip);
 298
 299 static void set_timeout(struct delayed_work *delayed_work, unsigned long time)
 300 {
 301         unsigned long delay;
 302
 303         delay = time - jiffies;
 304         if ((long)delay < 0)
 305                 delay = 0;
 306
 307         mod_delayed_work(addr_wq, delayed_work, delay);
 308 }
 309
 310 static void queue_req(struct addr_req *req)
 311 {
 312         struct addr_req *temp_req;
 313
 314         mutex_lock(&lock);
 315         list_for_each_entry_reverse(temp_req, &req_list, list) {
 316                 if (time_after_eq(req->timeout, temp_req->timeout))
 317                         break;
 318         }
 319
 320         list_add(&req->list, &temp_req->list);
 321
 322         set_timeout(&req->work, req->timeout);
 323         mutex_unlock(&lock);
 324 }
 325
 326 static int ib_nl_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 327                           const void *daddr, u32 seq, u16 family)
 328 {
 329         if (ibnl_chk_listeners(RDMA_NL_GROUP_LS))
 330                 return -EADDRNOTAVAIL;
 331
 332         /* We fill in what we can, the response will fill the rest */
 333         rdma_copy_addr(dev_addr, dst->dev, NULL);
 334         return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
 335 }
 336
 337 static int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 338                         const void *daddr)
 339 {
 340         struct neighbour *n;
 341         int ret;
 342
 343         n = dst_neigh_lookup(dst, daddr);
 344
 345         rcu_read_lock();
 346         if (!n || !(n->nud_state & NUD_VALID)) {
 347                 if (n)
 348                         neigh_event_send(n, NULL);
 349                 ret = -ENODATA;
 350         } else {
 351                 ret = rdma_copy_addr(dev_addr, dst->dev, n->ha);
 352         }
 353         rcu_read_unlock();
 354
 355         if (n)
 356                 neigh_release(n);
 357
 358         return ret;
 359 }
 360
 361 static bool has_gateway(struct dst_entry *dst, sa_family_t family)
 362 {
 363         struct rtable *rt;
 364         struct rt6_info *rt6;
 365
 366         if (family == AF_INET) {
 367                 rt = container_of(dst, struct rtable, dst);
 368                 return rt->rt_uses_gateway;
 369         }
 370
 371         rt6 = container_of(dst, struct rt6_info, dst);
 372         return rt6->rt6i_flags & RTF_GATEWAY;
 373 }
 374
 375 static int fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 376                     const struct sockaddr *dst_in, u32 seq)
 377 {
 378         const struct sockaddr_in *dst_in4 =
 379                 (const struct sockaddr_in *)dst_in;
 380         const struct sockaddr_in6 *dst_in6 =
 381                 (const struct sockaddr_in6 *)dst_in;
 382         const void *daddr = (dst_in->sa_family == AF_INET) ?
 383                 (const void *)&dst_in4->sin_addr.s_addr :
 384                 (const void *)&dst_in6->sin6_addr;
 385         sa_family_t family = dst_in->sa_family;
 386
 387         /* Gateway + ARPHRD_INFINIBAND -> IB router */
 388         if (has_gateway(dst, family) && dst->dev->type == ARPHRD_INFINIBAND)
 389                 return ib_nl_fetch_ha(dst, dev_addr, daddr, seq, family);
 390         else
 391                 return dst_fetch_ha(dst, dev_addr, daddr);
 392 }
 393
 394 static int addr4_resolve(struct sockaddr_in *src_in,
 395                          const struct sockaddr_in *dst_in,
 396                          struct rdma_dev_addr *addr,
 397                          struct rtable **prt)
 398 {
 399         __be32 src_ip = src_in->sin_addr.s_addr;
 400         __be32 dst_ip = dst_in->sin_addr.s_addr;
 401         struct rtable *rt;
 402         struct flowi4 fl4;
 403         int ret;
 404
 405         memset(&fl4, 0, sizeof(fl4));
 406         fl4.daddr = dst_ip;
 407         fl4.saddr = src_ip;
 408         fl4.flowi4_oif = addr->bound_dev_if;
 409         rt = ip_route_output_key(addr->net, &fl4);
 410         ret = PTR_ERR_OR_ZERO(rt);
 411         if (ret)
 412                 return ret;
 413
 414         src_in->sin_family = AF_INET;
 415         src_in->sin_addr.s_addr = fl4.saddr;
 416
 417         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 418          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 419          * type accordingly.
 420          */
 421         if (rt->rt_uses_gateway && rt->dst.dev->type != ARPHRD_INFINIBAND)
 422                 addr->network = RDMA_NETWORK_IPV4;
 423
 424         addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
 425
 426         *prt = rt;
 427         return 0;
 428 }
 429
 430 #if IS_ENABLED(CONFIG_IPV6)
 431 static int addr6_resolve(struct sockaddr_in6 *src_in,
 432                          const struct sockaddr_in6 *dst_in,
 433                          struct rdma_dev_addr *addr,
 434                          struct dst_entry **pdst)
 435 {
 436         struct flowi6 fl6;
 437         struct dst_entry *dst;
 438         struct rt6_info *rt;
 439         int ret;
 440
 441         memset(&fl6, 0, sizeof fl6);
 442         fl6.daddr = dst_in->sin6_addr;
 443         fl6.saddr = src_in->sin6_addr;
 444         fl6.flowi6_oif = addr->bound_dev_if;
 445
 446         ret = ipv6_stub->ipv6_dst_lookup(addr->net, NULL, &dst, &fl6);
 447         if (ret < 0)
 448                 return ret;
 449
 450         rt = (struct rt6_info *)dst;
 451         if (ipv6_addr_any(&src_in->sin6_addr)) {
 452                 src_in->sin6_family = AF_INET6;
 453                 src_in->sin6_addr = fl6.saddr;
 454         }
 455
 456         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 457          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 458          * type accordingly.
 459          */
 460         if (rt->rt6i_flags & RTF_GATEWAY &&
 461             ip6_dst_idev(dst)->dev->type != ARPHRD_INFINIBAND)
 462                 addr->network = RDMA_NETWORK_IPV6;
 463
 464         addr->hoplimit = ip6_dst_hoplimit(dst);
 465
 466         *pdst = dst;
 467         return 0;
 468 }
 469 #else
 470 static int addr6_resolve(struct sockaddr_in6 *src_in,
 471                          const struct sockaddr_in6 *dst_in,
 472                          struct rdma_dev_addr *addr,
 473                          struct dst_entry **pdst)
 474 {
 475         return -EADDRNOTAVAIL;
 476 }
 477 #endif
 478
 479 static int addr_resolve_neigh(struct dst_entry *dst,
 480                               const struct sockaddr *dst_in,
 481                               struct rdma_dev_addr *addr,
 482                               u32 seq)
 483 {
 484         if (dst->dev->flags & IFF_LOOPBACK) {
 485                 int ret;
 486
 487                 ret = rdma_translate_ip(dst_in, addr, NULL);
 488                 if (!ret)
 489                         memcpy(addr->dst_dev_addr, addr->src_dev_addr,
 490                                MAX_ADDR_LEN);
 491
 492                 return ret;
 493         }
 494
 495         /* If the device doesn't do ARP internally */
 496         if (!(dst->dev->flags & IFF_NOARP))
 497                 return fetch_ha(dst, addr, dst_in, seq);
 498
 499         return rdma_copy_addr(addr, dst->dev, NULL);
 500 }
 501
 502 static int addr_resolve(struct sockaddr *src_in,
 503                         const struct sockaddr *dst_in,
 504                         struct rdma_dev_addr *addr,
 505                         bool resolve_neigh,
 506                         u32 seq)
 507 {
 508         struct net_device *ndev;
 509         struct dst_entry *dst;
 510         int ret;
 511
 512         if (!addr->net) {
 513                 pr_warn_ratelimited("%s: missing namespace\n", __func__);
 514                 return -EINVAL;
 515         }
 516
 517         if (src_in->sa_family == AF_INET) {
 518                 struct rtable *rt = NULL;
 519                 const struct sockaddr_in *dst_in4 =
 520                         (const struct sockaddr_in *)dst_in;
 521
 522                 ret = addr4_resolve((struct sockaddr_in *)src_in,
 523                                     dst_in4, addr, &rt);
 524                 if (ret)
 525                         return ret;
 526
 527                 if (resolve_neigh)
 528                         ret = addr_resolve_neigh(&rt->dst, dst_in, addr, seq);
 529
 530                 if (addr->bound_dev_if) {
 531                         ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 532                 } else {
 533                         ndev = rt->dst.dev;
 534                         dev_hold(ndev);
 535                 }
 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                 if (addr->bound_dev_if) {
 552                         ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 553                 } else {
 554                         ndev = dst->dev;
 555                         dev_hold(ndev);
 556                 }
 557
 558                 dst_release(dst);
 559         }
 560
 561         if (ndev->flags & IFF_LOOPBACK) {
 562                 ret = rdma_translate_ip(dst_in, addr, NULL);
 563                 /*
 564                  * Put the loopback device and get the translated
 565                  * device instead.
 566                  */
 567                 dev_put(ndev);
 568                 ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 569         } else {
 570                 addr->bound_dev_if = ndev->ifindex;
 571         }
 572         dev_put(ndev);
 573
 574         return ret;
 575 }
 576
 577 static void process_one_req(struct work_struct *_work)
 578 {
 579         struct addr_req *req;
 580         struct sockaddr *src_in, *dst_in;
 581
 582         mutex_lock(&lock);
 583         req = container_of(_work, struct addr_req, work.work);
 584
 585         if (req->status == -ENODATA) {
 586                 src_in = (struct sockaddr *)&req->src_addr;
 587                 dst_in = (struct sockaddr *)&req->dst_addr;
 588                 req->status = addr_resolve(src_in, dst_in, req->addr,
 589                                            true, req->seq);
 590                 if (req->status && time_after_eq(jiffies, req->timeout)) {
 591                         req->status = -ETIMEDOUT;
 592                 } else if (req->status == -ENODATA) {
 593                         /* requeue the work for retrying again */
 594                         set_timeout(&req->work, req->timeout);
 595                         mutex_unlock(&lock);
 596                         return;
 597                 }
 598         }
 599         list_del(&req->list);
 600         mutex_unlock(&lock);
 601
 602         req->callback(req->status, (struct sockaddr *)&req->src_addr,
 603                 req->addr, req->context);
 604         put_client(req->client);
 605         kfree(req);
 606 }
 607
 608 static void process_req(struct work_struct *work)
 609 {
 610         struct addr_req *req, *temp_req;
 611         struct sockaddr *src_in, *dst_in;
 612         struct list_head done_list;
 613
 614         INIT_LIST_HEAD(&done_list);
 615
 616         mutex_lock(&lock);
 617         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 618                 if (req->status == -ENODATA) {
 619                         src_in = (struct sockaddr *) &req->src_addr;
 620                         dst_in = (struct sockaddr *) &req->dst_addr;
 621                         req->status = addr_resolve(src_in, dst_in, req->addr,
 622                                                    true, req->seq);
 623                         if (req->status && time_after_eq(jiffies, req->timeout))
 624                                 req->status = -ETIMEDOUT;
 625                         else if (req->status == -ENODATA) {
 626                                 set_timeout(&req->work, req->timeout);
 627                                 continue;
 628                         }
 629                 }
 630                 list_move_tail(&req->list, &done_list);
 631         }
 632
 633         mutex_unlock(&lock);
 634
 635         list_for_each_entry_safe(req, temp_req, &done_list, list) {
 636                 list_del(&req->list);
 637                 /* It is safe to cancel other work items from this work item
 638                  * because at a time there can be only one work item running
 639                  * with this single threaded work queue.
 640                  */
 641                 cancel_delayed_work(&req->work);
 642                 req->callback(req->status, (struct sockaddr *) &req->src_addr,
 643                         req->addr, req->context);
 644                 put_client(req->client);
 645                 kfree(req);
 646         }
 647 }
 648
 649 int rdma_resolve_ip(struct rdma_addr_client *client,
 650                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
 651                     struct rdma_dev_addr *addr, int timeout_ms,
 652                     void (*callback)(int status, struct sockaddr *src_addr,
 653                                      struct rdma_dev_addr *addr, void *context),
 654                     void *context)
 655 {
 656         struct sockaddr *src_in, *dst_in;
 657         struct addr_req *req;
 658         int ret = 0;
 659
 660         req = kzalloc(sizeof *req, GFP_KERNEL);
 661         if (!req)
 662                 return -ENOMEM;
 663
 664         src_in = (struct sockaddr *) &req->src_addr;
 665         dst_in = (struct sockaddr *) &req->dst_addr;
 666
 667         if (src_addr) {
 668                 if (src_addr->sa_family != dst_addr->sa_family) {
 669                         ret = -EINVAL;
 670                         goto err;
 671                 }
 672
 673                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 674         } else {
 675                 src_in->sa_family = dst_addr->sa_family;
 676         }
 677
 678         memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
 679         req->addr = addr;
 680         req->callback = callback;
 681         req->context = context;
 682         req->client = client;
 683         atomic_inc(&client->refcount);
 684         INIT_DELAYED_WORK(&req->work, process_one_req);
 685         req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
 686
 687         req->status = addr_resolve(src_in, dst_in, addr, true, req->seq);
 688         switch (req->status) {
 689         case 0:
 690                 req->timeout = jiffies;
 691                 queue_req(req);
 692                 break;
 693         case -ENODATA:
 694                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
 695                 queue_req(req);
 696                 break;
 697         default:
 698                 ret = req->status;
 699                 atomic_dec(&client->refcount);
 700                 goto err;
 701         }
 702         return ret;
 703 err:
 704         kfree(req);
 705         return ret;
 706 }
 707 EXPORT_SYMBOL(rdma_resolve_ip);
 708
 709 int rdma_resolve_ip_route(struct sockaddr *src_addr,
 710                           const struct sockaddr *dst_addr,
 711                           struct rdma_dev_addr *addr)
 712 {
 713         struct sockaddr_storage ssrc_addr = {};
 714         struct sockaddr *src_in = (struct sockaddr *)&ssrc_addr;
 715
 716         if (src_addr) {
 717                 if (src_addr->sa_family != dst_addr->sa_family)
 718                         return -EINVAL;
 719
 720                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 721         } else {
 722                 src_in->sa_family = dst_addr->sa_family;
 723         }
 724
 725         return addr_resolve(src_in, dst_addr, addr, false, 0);
 726 }
 727 EXPORT_SYMBOL(rdma_resolve_ip_route);
 728
 729 void rdma_addr_cancel(struct rdma_dev_addr *addr)
 730 {
 731         struct addr_req *req, *temp_req;
 732
 733         mutex_lock(&lock);
 734         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 735                 if (req->addr == addr) {
 736                         req->status = -ECANCELED;
 737                         req->timeout = jiffies;
 738                         list_move(&req->list, &req_list);
 739                         set_timeout(&req->work, req->timeout);
 740                         break;
 741                 }
 742         }
 743         mutex_unlock(&lock);
 744 }
 745 EXPORT_SYMBOL(rdma_addr_cancel);
 746
 747 struct resolve_cb_context {
 748         struct rdma_dev_addr *addr;
 749         struct completion comp;
 750         int status;
 751 };
 752
 753 static void resolve_cb(int status, struct sockaddr *src_addr,
 754              struct rdma_dev_addr *addr, void *context)
 755 {
 756         if (!status)
 757                 memcpy(((struct resolve_cb_context *)context)->addr,
 758                        addr, sizeof(struct rdma_dev_addr));
 759         ((struct resolve_cb_context *)context)->status = status;
 760         complete(&((struct resolve_cb_context *)context)->comp);
 761 }
 762
 763 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 764                                  const union ib_gid *dgid,
 765                                  u8 *dmac, u16 *vlan_id, int *if_index,
 766                                  int *hoplimit)
 767 {
 768         int ret = 0;
 769         struct rdma_dev_addr dev_addr;
 770         struct resolve_cb_context ctx;
 771         struct net_device *dev;
 772
 773         union {
 774                 struct sockaddr     _sockaddr;
 775                 struct sockaddr_in  _sockaddr_in;
 776                 struct sockaddr_in6 _sockaddr_in6;
 777         } sgid_addr, dgid_addr;
 778
 779
 780         rdma_gid2ip(&sgid_addr._sockaddr, sgid);
 781         rdma_gid2ip(&dgid_addr._sockaddr, dgid);
 782
 783         memset(&dev_addr, 0, sizeof(dev_addr));
 784         if (if_index)
 785                 dev_addr.bound_dev_if = *if_index;
 786         dev_addr.net = &init_net;
 787
 788         ctx.addr = &dev_addr;
 789         init_completion(&ctx.comp);
 790         ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
 791                         &dev_addr, 1000, resolve_cb, &ctx);
 792         if (ret)
 793                 return ret;
 794
 795         wait_for_completion(&ctx.comp);
 796
 797         ret = ctx.status;
 798         if (ret)
 799                 return ret;
 800
 801         memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
 802         dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if);
 803         if (!dev)
 804                 return -ENODEV;
 805         if (if_index)
 806                 *if_index = dev_addr.bound_dev_if;
 807         if (vlan_id)
 808                 *vlan_id = rdma_vlan_dev_vlan_id(dev);
 809         if (hoplimit)
 810                 *hoplimit = dev_addr.hoplimit;
 811         dev_put(dev);
 812         return ret;
 813 }
 814 EXPORT_SYMBOL(rdma_addr_find_l2_eth_by_grh);
 815
 816 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id)
 817 {
 818         int ret = 0;
 819         struct rdma_dev_addr dev_addr;
 820         union {
 821                 struct sockaddr     _sockaddr;
 822                 struct sockaddr_in  _sockaddr_in;
 823                 struct sockaddr_in6 _sockaddr_in6;
 824         } gid_addr;
 825
 826         rdma_gid2ip(&gid_addr._sockaddr, sgid);
 827
 828         memset(&dev_addr, 0, sizeof(dev_addr));
 829         dev_addr.net = &init_net;
 830         ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id);
 831         if (ret)
 832                 return ret;
 833
 834         memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN);
 835         return ret;
 836 }
 837 EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid);
 838
 839 static int netevent_callback(struct notifier_block *self, unsigned long event,
 840         void *ctx)
 841 {
 842         if (event == NETEVENT_NEIGH_UPDATE) {
 843                 struct neighbour *neigh = ctx;
 844
 845                 if (neigh->nud_state & NUD_VALID)
 846                         set_timeout(&work, jiffies);
 847         }
 848         return 0;
 849 }
 850
 851 static struct notifier_block nb = {
 852         .notifier_call = netevent_callback
 853 };
 854
 855 int addr_init(void)
 856 {
 857         addr_wq = alloc_ordered_workqueue("ib_addr", WQ_MEM_RECLAIM);
 858         if (!addr_wq)
 859                 return -ENOMEM;
 860
 861         register_netevent_notifier(&nb);
 862         rdma_addr_register_client(&self);
 863
 864         return 0;
 865 }
 866
 867 void addr_cleanup(void)
 868 {
 869         rdma_addr_unregister_client(&self);
 870         unregister_netevent_notifier(&nb);
 871         destroy_workqueue(addr_wq);
 872 }