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 nlmsghdr *nlh,
 134                              struct netlink_ext_ack *extack)
 135 {
 136         if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
 137             !(NETLINK_CB(skb).sk))
 138                 return -EPERM;
 139
 140         if (ib_nl_is_good_ip_resp(nlh))
 141                 ib_nl_process_good_ip_rsep(nlh);
 142
 143         return skb->len;
 144 }
 145
 146 static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
 147                              const void *daddr,
 148                              u32 seq, u16 family)
 149 {
 150         struct sk_buff *skb = NULL;
 151         struct nlmsghdr *nlh;
 152         struct rdma_ls_ip_resolve_header *header;
 153         void *data;
 154         size_t size;
 155         int attrtype;
 156         int len;
 157
 158         if (family == AF_INET) {
 159                 size = sizeof(struct in_addr);
 160                 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
 161         } else {
 162                 size = sizeof(struct in6_addr);
 163                 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
 164         }
 165
 166         len = nla_total_size(sizeof(size));
 167         len += NLMSG_ALIGN(sizeof(*header));
 168
 169         skb = nlmsg_new(len, GFP_KERNEL);
 170         if (!skb)
 171                 return -ENOMEM;
 172
 173         data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
 174                             RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
 175         if (!data) {
 176                 nlmsg_free(skb);
 177                 return -ENODATA;
 178         }
 179
 180         /* Construct the family header first */
 181         header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
 182         header->ifindex = dev_addr->bound_dev_if;
 183         nla_put(skb, attrtype, size, daddr);
 184
 185         /* Repair the nlmsg header length */
 186         nlmsg_end(skb, nlh);
 187         rdma_nl_multicast(skb, RDMA_NL_GROUP_LS, GFP_KERNEL);
 188
 189         /* Make the request retry, so when we get the response from userspace
 190          * we will have something.
 191          */
 192         return -ENODATA;
 193 }
 194
 195 int rdma_addr_size(struct sockaddr *addr)
 196 {
 197         switch (addr->sa_family) {
 198         case AF_INET:
 199                 return sizeof(struct sockaddr_in);
 200         case AF_INET6:
 201                 return sizeof(struct sockaddr_in6);
 202         case AF_IB:
 203                 return sizeof(struct sockaddr_ib);
 204         default:
 205                 return 0;
 206         }
 207 }
 208 EXPORT_SYMBOL(rdma_addr_size);
 209
 210 static struct rdma_addr_client self;
 211
 212 void rdma_addr_register_client(struct rdma_addr_client *client)
 213 {
 214         atomic_set(&client->refcount, 1);
 215         init_completion(&client->comp);
 216 }
 217 EXPORT_SYMBOL(rdma_addr_register_client);
 218
 219 static inline void put_client(struct rdma_addr_client *client)
 220 {
 221         if (atomic_dec_and_test(&client->refcount))
 222                 complete(&client->comp);
 223 }
 224
 225 void rdma_addr_unregister_client(struct rdma_addr_client *client)
 226 {
 227         put_client(client);
 228         wait_for_completion(&client->comp);
 229 }
 230 EXPORT_SYMBOL(rdma_addr_unregister_client);
 231
 232 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 233                      const unsigned char *dst_dev_addr)
 234 {
 235         dev_addr->dev_type = dev->type;
 236         memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 237         memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
 238         if (dst_dev_addr)
 239                 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
 240         dev_addr->bound_dev_if = dev->ifindex;
 241         return 0;
 242 }
 243 EXPORT_SYMBOL(rdma_copy_addr);
 244
 245 int rdma_translate_ip(const struct sockaddr *addr,
 246                       struct rdma_dev_addr *dev_addr,
 247                       u16 *vlan_id)
 248 {
 249         struct net_device *dev;
 250         int ret = -EADDRNOTAVAIL;
 251
 252         if (dev_addr->bound_dev_if) {
 253                 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
 254                 if (!dev)
 255                         return -ENODEV;
 256                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 257                 dev_put(dev);
 258                 return ret;
 259         }
 260
 261         switch (addr->sa_family) {
 262         case AF_INET:
 263                 dev = ip_dev_find(dev_addr->net,
 264                         ((const struct sockaddr_in *)addr)->sin_addr.s_addr);
 265
 266                 if (!dev)
 267                         return ret;
 268
 269                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 270                 dev_addr->bound_dev_if = dev->ifindex;
 271                 if (vlan_id)
 272                         *vlan_id = rdma_vlan_dev_vlan_id(dev);
 273                 dev_put(dev);
 274                 break;
 275 #if IS_ENABLED(CONFIG_IPV6)
 276         case AF_INET6:
 277                 rcu_read_lock();
 278                 for_each_netdev_rcu(dev_addr->net, dev) {
 279                         if (ipv6_chk_addr(dev_addr->net,
 280                                           &((const struct sockaddr_in6 *)addr)->sin6_addr,
 281                                           dev, 1)) {
 282                                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 283                                 dev_addr->bound_dev_if = dev->ifindex;
 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(struct delayed_work *delayed_work, 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, delayed_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         set_timeout(&req->work, req->timeout);
 321         mutex_unlock(&lock);
 322 }
 323
 324 static int ib_nl_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 325                           const void *daddr, u32 seq, u16 family)
 326 {
 327         if (rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))
 328                 return -EADDRNOTAVAIL;
 329
 330         /* We fill in what we can, the response will fill the rest */
 331         rdma_copy_addr(dev_addr, dst->dev, NULL);
 332         return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
 333 }
 334
 335 static int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 336                         const void *daddr)
 337 {
 338         struct neighbour *n;
 339         int ret;
 340
 341         n = dst_neigh_lookup(dst, daddr);
 342
 343         rcu_read_lock();
 344         if (!n || !(n->nud_state & NUD_VALID)) {
 345                 if (n)
 346                         neigh_event_send(n, NULL);
 347                 ret = -ENODATA;
 348         } else {
 349                 ret = rdma_copy_addr(dev_addr, dst->dev, n->ha);
 350         }
 351         rcu_read_unlock();
 352
 353         if (n)
 354                 neigh_release(n);
 355
 356         return ret;
 357 }
 358
 359 static bool has_gateway(struct dst_entry *dst, sa_family_t family)
 360 {
 361         struct rtable *rt;
 362         struct rt6_info *rt6;
 363
 364         if (family == AF_INET) {
 365                 rt = container_of(dst, struct rtable, dst);
 366                 return rt->rt_uses_gateway;
 367         }
 368
 369         rt6 = container_of(dst, struct rt6_info, dst);
 370         return rt6->rt6i_flags & RTF_GATEWAY;
 371 }
 372
 373 static int fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 374                     const struct sockaddr *dst_in, u32 seq)
 375 {
 376         const struct sockaddr_in *dst_in4 =
 377                 (const struct sockaddr_in *)dst_in;
 378         const struct sockaddr_in6 *dst_in6 =
 379                 (const struct sockaddr_in6 *)dst_in;
 380         const void *daddr = (dst_in->sa_family == AF_INET) ?
 381                 (const void *)&dst_in4->sin_addr.s_addr :
 382                 (const void *)&dst_in6->sin6_addr;
 383         sa_family_t family = dst_in->sa_family;
 384
 385         /* Gateway + ARPHRD_INFINIBAND -> IB router */
 386         if (has_gateway(dst, family) && dst->dev->type == ARPHRD_INFINIBAND)
 387                 return ib_nl_fetch_ha(dst, dev_addr, daddr, seq, family);
 388         else
 389                 return dst_fetch_ha(dst, dev_addr, daddr);
 390 }
 391
 392 static int addr4_resolve(struct sockaddr_in *src_in,
 393                          const struct sockaddr_in *dst_in,
 394                          struct rdma_dev_addr *addr,
 395                          struct rtable **prt)
 396 {
 397         __be32 src_ip = src_in->sin_addr.s_addr;
 398         __be32 dst_ip = dst_in->sin_addr.s_addr;
 399         struct rtable *rt;
 400         struct flowi4 fl4;
 401         int ret;
 402
 403         memset(&fl4, 0, sizeof(fl4));
 404         fl4.daddr = dst_ip;
 405         fl4.saddr = src_ip;
 406         fl4.flowi4_oif = addr->bound_dev_if;
 407         rt = ip_route_output_key(addr->net, &fl4);
 408         ret = PTR_ERR_OR_ZERO(rt);
 409         if (ret)
 410                 return ret;
 411
 412         src_in->sin_family = AF_INET;
 413         src_in->sin_addr.s_addr = fl4.saddr;
 414
 415         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 416          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 417          * type accordingly.
 418          */
 419         if (rt->rt_uses_gateway && rt->dst.dev->type != ARPHRD_INFINIBAND)
 420                 addr->network = RDMA_NETWORK_IPV4;
 421
 422         addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
 423
 424         *prt = rt;
 425         return 0;
 426 }
 427
 428 #if IS_ENABLED(CONFIG_IPV6)
 429 static int addr6_resolve(struct sockaddr_in6 *src_in,
 430                          const struct sockaddr_in6 *dst_in,
 431                          struct rdma_dev_addr *addr,
 432                          struct dst_entry **pdst)
 433 {
 434         struct flowi6 fl6;
 435         struct dst_entry *dst;
 436         struct rt6_info *rt;
 437         int ret;
 438
 439         memset(&fl6, 0, sizeof fl6);
 440         fl6.daddr = dst_in->sin6_addr;
 441         fl6.saddr = src_in->sin6_addr;
 442         fl6.flowi6_oif = addr->bound_dev_if;
 443
 444         ret = ipv6_stub->ipv6_dst_lookup(addr->net, NULL, &dst, &fl6);
 445         if (ret < 0)
 446                 return ret;
 447
 448         rt = (struct rt6_info *)dst;
 449         if (ipv6_addr_any(&src_in->sin6_addr)) {
 450                 src_in->sin6_family = AF_INET6;
 451                 src_in->sin6_addr = fl6.saddr;
 452         }
 453
 454         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 455          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 456          * type accordingly.
 457          */
 458         if (rt->rt6i_flags & RTF_GATEWAY &&
 459             ip6_dst_idev(dst)->dev->type != ARPHRD_INFINIBAND)
 460                 addr->network = RDMA_NETWORK_IPV6;
 461
 462         addr->hoplimit = ip6_dst_hoplimit(dst);
 463
 464         *pdst = dst;
 465         return 0;
 466 }
 467 #else
 468 static int addr6_resolve(struct sockaddr_in6 *src_in,
 469                          const struct sockaddr_in6 *dst_in,
 470                          struct rdma_dev_addr *addr,
 471                          struct dst_entry **pdst)
 472 {
 473         return -EADDRNOTAVAIL;
 474 }
 475 #endif
 476
 477 static int addr_resolve_neigh(struct dst_entry *dst,
 478                               const struct sockaddr *dst_in,
 479                               struct rdma_dev_addr *addr,
 480                               u32 seq)
 481 {
 482         if (dst->dev->flags & IFF_LOOPBACK) {
 483                 int ret;
 484
 485                 ret = rdma_translate_ip(dst_in, addr, NULL);
 486                 if (!ret)
 487                         memcpy(addr->dst_dev_addr, addr->src_dev_addr,
 488                                MAX_ADDR_LEN);
 489
 490                 return ret;
 491         }
 492
 493         /* If the device doesn't do ARP internally */
 494         if (!(dst->dev->flags & IFF_NOARP))
 495                 return fetch_ha(dst, addr, dst_in, seq);
 496
 497         return rdma_copy_addr(addr, dst->dev, NULL);
 498 }
 499
 500 static int addr_resolve(struct sockaddr *src_in,
 501                         const struct sockaddr *dst_in,
 502                         struct rdma_dev_addr *addr,
 503                         bool resolve_neigh,
 504                         u32 seq)
 505 {
 506         struct net_device *ndev;
 507         struct dst_entry *dst;
 508         int ret;
 509
 510         if (!addr->net) {
 511                 pr_warn_ratelimited("%s: missing namespace\n", __func__);
 512                 return -EINVAL;
 513         }
 514
 515         if (src_in->sa_family == AF_INET) {
 516                 struct rtable *rt = NULL;
 517                 const struct sockaddr_in *dst_in4 =
 518                         (const struct sockaddr_in *)dst_in;
 519
 520                 ret = addr4_resolve((struct sockaddr_in *)src_in,
 521                                     dst_in4, addr, &rt);
 522                 if (ret)
 523                         return ret;
 524
 525                 if (resolve_neigh)
 526                         ret = addr_resolve_neigh(&rt->dst, dst_in, addr, seq);
 527
 528                 if (addr->bound_dev_if) {
 529                         ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 530                 } else {
 531                         ndev = rt->dst.dev;
 532                         dev_hold(ndev);
 533                 }
 534
 535                 ip_rt_put(rt);
 536         } else {
 537                 const struct sockaddr_in6 *dst_in6 =
 538                         (const struct sockaddr_in6 *)dst_in;
 539
 540                 ret = addr6_resolve((struct sockaddr_in6 *)src_in,
 541                                     dst_in6, addr,
 542                                     &dst);
 543                 if (ret)
 544                         return ret;
 545
 546                 if (resolve_neigh)
 547                         ret = addr_resolve_neigh(dst, dst_in, addr, seq);
 548
 549                 if (addr->bound_dev_if) {
 550                         ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 551                 } else {
 552                         ndev = dst->dev;
 553                         dev_hold(ndev);
 554                 }
 555
 556                 dst_release(dst);
 557         }
 558
 559         if (ndev->flags & IFF_LOOPBACK) {
 560                 ret = rdma_translate_ip(dst_in, addr, NULL);
 561                 /*
 562                  * Put the loopback device and get the translated
 563                  * device instead.
 564                  */
 565                 dev_put(ndev);
 566                 ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 567         } else {
 568                 addr->bound_dev_if = ndev->ifindex;
 569         }
 570         dev_put(ndev);
 571
 572         return ret;
 573 }
 574
 575 static void process_one_req(struct work_struct *_work)
 576 {
 577         struct addr_req *req;
 578         struct sockaddr *src_in, *dst_in;
 579
 580         mutex_lock(&lock);
 581         req = container_of(_work, struct addr_req, work.work);
 582
 583         if (req->status == -ENODATA) {
 584                 src_in = (struct sockaddr *)&req->src_addr;
 585                 dst_in = (struct sockaddr *)&req->dst_addr;
 586                 req->status = addr_resolve(src_in, dst_in, req->addr,
 587                                            true, req->seq);
 588                 if (req->status && time_after_eq(jiffies, req->timeout)) {
 589                         req->status = -ETIMEDOUT;
 590                 } else if (req->status == -ENODATA) {
 591                         /* requeue the work for retrying again */
 592                         set_timeout(&req->work, req->timeout);
 593                         mutex_unlock(&lock);
 594                         return;
 595                 }
 596         }
 597         list_del(&req->list);
 598         mutex_unlock(&lock);
 599
 600         req->callback(req->status, (struct sockaddr *)&req->src_addr,
 601                 req->addr, req->context);
 602         put_client(req->client);
 603         kfree(req);
 604 }
 605
 606 static void process_req(struct work_struct *work)
 607 {
 608         struct addr_req *req, *temp_req;
 609         struct sockaddr *src_in, *dst_in;
 610         struct list_head done_list;
 611
 612         INIT_LIST_HEAD(&done_list);
 613
 614         mutex_lock(&lock);
 615         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 616                 if (req->status == -ENODATA) {
 617                         src_in = (struct sockaddr *) &req->src_addr;
 618                         dst_in = (struct sockaddr *) &req->dst_addr;
 619                         req->status = addr_resolve(src_in, dst_in, req->addr,
 620                                                    true, req->seq);
 621                         if (req->status && time_after_eq(jiffies, req->timeout))
 622                                 req->status = -ETIMEDOUT;
 623                         else if (req->status == -ENODATA) {
 624                                 set_timeout(&req->work, req->timeout);
 625                                 continue;
 626                         }
 627                 }
 628                 list_move_tail(&req->list, &done_list);
 629         }
 630
 631         mutex_unlock(&lock);
 632
 633         list_for_each_entry_safe(req, temp_req, &done_list, list) {
 634                 list_del(&req->list);
 635                 /* It is safe to cancel other work items from this work item
 636                  * because at a time there can be only one work item running
 637                  * with this single threaded work queue.
 638                  */
 639                 cancel_delayed_work(&req->work);
 640                 req->callback(req->status, (struct sockaddr *) &req->src_addr,
 641                         req->addr, req->context);
 642                 put_client(req->client);
 643                 kfree(req);
 644         }
 645 }
 646
 647 int rdma_resolve_ip(struct rdma_addr_client *client,
 648                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
 649                     struct rdma_dev_addr *addr, int timeout_ms,
 650                     void (*callback)(int status, struct sockaddr *src_addr,
 651                                      struct rdma_dev_addr *addr, void *context),
 652                     void *context)
 653 {
 654         struct sockaddr *src_in, *dst_in;
 655         struct addr_req *req;
 656         int ret = 0;
 657
 658         req = kzalloc(sizeof *req, GFP_KERNEL);
 659         if (!req)
 660                 return -ENOMEM;
 661
 662         src_in = (struct sockaddr *) &req->src_addr;
 663         dst_in = (struct sockaddr *) &req->dst_addr;
 664
 665         if (src_addr) {
 666                 if (src_addr->sa_family != dst_addr->sa_family) {
 667                         ret = -EINVAL;
 668                         goto err;
 669                 }
 670
 671                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 672         } else {
 673                 src_in->sa_family = dst_addr->sa_family;
 674         }
 675
 676         memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
 677         req->addr = addr;
 678         req->callback = callback;
 679         req->context = context;
 680         req->client = client;
 681         atomic_inc(&client->refcount);
 682         INIT_DELAYED_WORK(&req->work, process_one_req);
 683         req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
 684
 685         req->status = addr_resolve(src_in, dst_in, addr, true, req->seq);
 686         switch (req->status) {
 687         case 0:
 688                 req->timeout = jiffies;
 689                 queue_req(req);
 690                 break;
 691         case -ENODATA:
 692                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
 693                 queue_req(req);
 694                 break;
 695         default:
 696                 ret = req->status;
 697                 atomic_dec(&client->refcount);
 698                 goto err;
 699         }
 700         return ret;
 701 err:
 702         kfree(req);
 703         return ret;
 704 }
 705 EXPORT_SYMBOL(rdma_resolve_ip);
 706
 707 int rdma_resolve_ip_route(struct sockaddr *src_addr,
 708                           const struct sockaddr *dst_addr,
 709                           struct rdma_dev_addr *addr)
 710 {
 711         struct sockaddr_storage ssrc_addr = {};
 712         struct sockaddr *src_in = (struct sockaddr *)&ssrc_addr;
 713
 714         if (src_addr) {
 715                 if (src_addr->sa_family != dst_addr->sa_family)
 716                         return -EINVAL;
 717
 718                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 719         } else {
 720                 src_in->sa_family = dst_addr->sa_family;
 721         }
 722
 723         return addr_resolve(src_in, dst_addr, addr, false, 0);
 724 }
 725 EXPORT_SYMBOL(rdma_resolve_ip_route);
 726
 727 void rdma_addr_cancel(struct rdma_dev_addr *addr)
 728 {
 729         struct addr_req *req, *temp_req;
 730
 731         mutex_lock(&lock);
 732         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 733                 if (req->addr == addr) {
 734                         req->status = -ECANCELED;
 735                         req->timeout = jiffies;
 736                         list_move(&req->list, &req_list);
 737                         set_timeout(&req->work, req->timeout);
 738                         break;
 739                 }
 740         }
 741         mutex_unlock(&lock);
 742 }
 743 EXPORT_SYMBOL(rdma_addr_cancel);
 744
 745 struct resolve_cb_context {
 746         struct rdma_dev_addr *addr;
 747         struct completion comp;
 748         int status;
 749 };
 750
 751 static void resolve_cb(int status, struct sockaddr *src_addr,
 752              struct rdma_dev_addr *addr, void *context)
 753 {
 754         if (!status)
 755                 memcpy(((struct resolve_cb_context *)context)->addr,
 756                        addr, sizeof(struct rdma_dev_addr));
 757         ((struct resolve_cb_context *)context)->status = status;
 758         complete(&((struct resolve_cb_context *)context)->comp);
 759 }
 760
 761 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 762                                  const union ib_gid *dgid,
 763                                  u8 *dmac, u16 *vlan_id, int *if_index,
 764                                  int *hoplimit)
 765 {
 766         int ret = 0;
 767         struct rdma_dev_addr dev_addr;
 768         struct resolve_cb_context ctx;
 769         struct net_device *dev;
 770
 771         union {
 772                 struct sockaddr     _sockaddr;
 773                 struct sockaddr_in  _sockaddr_in;
 774                 struct sockaddr_in6 _sockaddr_in6;
 775         } sgid_addr, dgid_addr;
 776
 777
 778         rdma_gid2ip(&sgid_addr._sockaddr, sgid);
 779         rdma_gid2ip(&dgid_addr._sockaddr, dgid);
 780
 781         memset(&dev_addr, 0, sizeof(dev_addr));
 782         if (if_index)
 783                 dev_addr.bound_dev_if = *if_index;
 784         dev_addr.net = &init_net;
 785
 786         ctx.addr = &dev_addr;
 787         init_completion(&ctx.comp);
 788         ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
 789                         &dev_addr, 1000, resolve_cb, &ctx);
 790         if (ret)
 791                 return ret;
 792
 793         wait_for_completion(&ctx.comp);
 794
 795         ret = ctx.status;
 796         if (ret)
 797                 return ret;
 798
 799         memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
 800         dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if);
 801         if (!dev)
 802                 return -ENODEV;
 803         if (if_index)
 804                 *if_index = dev_addr.bound_dev_if;
 805         if (vlan_id)
 806                 *vlan_id = rdma_vlan_dev_vlan_id(dev);
 807         if (hoplimit)
 808                 *hoplimit = dev_addr.hoplimit;
 809         dev_put(dev);
 810         return ret;
 811 }
 812 EXPORT_SYMBOL(rdma_addr_find_l2_eth_by_grh);
 813
 814 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id)
 815 {
 816         int ret = 0;
 817         struct rdma_dev_addr dev_addr;
 818         union {
 819                 struct sockaddr     _sockaddr;
 820                 struct sockaddr_in  _sockaddr_in;
 821                 struct sockaddr_in6 _sockaddr_in6;
 822         } gid_addr;
 823
 824         rdma_gid2ip(&gid_addr._sockaddr, sgid);
 825
 826         memset(&dev_addr, 0, sizeof(dev_addr));
 827         dev_addr.net = &init_net;
 828         ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id);
 829         if (ret)
 830                 return ret;
 831
 832         memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN);
 833         return ret;
 834 }
 835 EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid);
 836
 837 static int netevent_callback(struct notifier_block *self, unsigned long event,
 838         void *ctx)
 839 {
 840         if (event == NETEVENT_NEIGH_UPDATE) {
 841                 struct neighbour *neigh = ctx;
 842
 843                 if (neigh->nud_state & NUD_VALID)
 844                         set_timeout(&work, jiffies);
 845         }
 846         return 0;
 847 }
 848
 849 static struct notifier_block nb = {
 850         .notifier_call = netevent_callback
 851 };
 852
 853 int addr_init(void)
 854 {
 855         addr_wq = alloc_ordered_workqueue("ib_addr", WQ_MEM_RECLAIM);
 856         if (!addr_wq)
 857                 return -ENOMEM;
 858
 859         register_netevent_notifier(&nb);
 860         rdma_addr_register_client(&self);
 861
 862         return 0;
 863 }
 864
 865 void addr_cleanup(void)
 866 {
 867         rdma_addr_unregister_client(&self);
 868         unregister_netevent_notifier(&nb);
 869         destroy_workqueue(addr_wq);
 870 }