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 0;
 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 int rdma_addr_size_in6(struct sockaddr_in6 *addr)
 211 {
 212         int ret = rdma_addr_size((struct sockaddr *) addr);
 213
 214         return ret <= sizeof(*addr) ? ret : 0;
 215 }
 216 EXPORT_SYMBOL(rdma_addr_size_in6);
 217
 218 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)
 219 {
 220         int ret = rdma_addr_size((struct sockaddr *) addr);
 221
 222         return ret <= sizeof(*addr) ? ret : 0;
 223 }
 224 EXPORT_SYMBOL(rdma_addr_size_kss);
 225
 226 static struct rdma_addr_client self;
 227
 228 void rdma_addr_register_client(struct rdma_addr_client *client)
 229 {
 230         atomic_set(&client->refcount, 1);
 231         init_completion(&client->comp);
 232 }
 233 EXPORT_SYMBOL(rdma_addr_register_client);
 234
 235 static inline void put_client(struct rdma_addr_client *client)
 236 {
 237         if (atomic_dec_and_test(&client->refcount))
 238                 complete(&client->comp);
 239 }
 240
 241 void rdma_addr_unregister_client(struct rdma_addr_client *client)
 242 {
 243         put_client(client);
 244         wait_for_completion(&client->comp);
 245 }
 246 EXPORT_SYMBOL(rdma_addr_unregister_client);
 247
 248 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev,
 249                      const unsigned char *dst_dev_addr)
 250 {
 251         dev_addr->dev_type = dev->type;
 252         memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 253         memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
 254         if (dst_dev_addr)
 255                 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
 256         dev_addr->bound_dev_if = dev->ifindex;
 257         return 0;
 258 }
 259 EXPORT_SYMBOL(rdma_copy_addr);
 260
 261 int rdma_translate_ip(const struct sockaddr *addr,
 262                       struct rdma_dev_addr *dev_addr,
 263                       u16 *vlan_id)
 264 {
 265         struct net_device *dev;
 266         int ret = -EADDRNOTAVAIL;
 267
 268         if (dev_addr->bound_dev_if) {
 269                 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
 270                 if (!dev)
 271                         return -ENODEV;
 272                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 273                 dev_put(dev);
 274                 return ret;
 275         }
 276
 277         switch (addr->sa_family) {
 278         case AF_INET:
 279                 dev = ip_dev_find(dev_addr->net,
 280                         ((const struct sockaddr_in *)addr)->sin_addr.s_addr);
 281
 282                 if (!dev)
 283                         return ret;
 284
 285                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 286                 dev_addr->bound_dev_if = dev->ifindex;
 287                 if (vlan_id)
 288                         *vlan_id = rdma_vlan_dev_vlan_id(dev);
 289                 dev_put(dev);
 290                 break;
 291 #if IS_ENABLED(CONFIG_IPV6)
 292         case AF_INET6:
 293                 rcu_read_lock();
 294                 for_each_netdev_rcu(dev_addr->net, dev) {
 295                         if (ipv6_chk_addr(dev_addr->net,
 296                                           &((const struct sockaddr_in6 *)addr)->sin6_addr,
 297                                           dev, 1)) {
 298                                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 299                                 dev_addr->bound_dev_if = dev->ifindex;
 300                                 if (vlan_id)
 301                                         *vlan_id = rdma_vlan_dev_vlan_id(dev);
 302                                 break;
 303                         }
 304                 }
 305                 rcu_read_unlock();
 306                 break;
 307 #endif
 308         }
 309         return ret;
 310 }
 311 EXPORT_SYMBOL(rdma_translate_ip);
 312
 313 static void set_timeout(struct delayed_work *delayed_work, unsigned long time)
 314 {
 315         unsigned long delay;
 316
 317         delay = time - jiffies;
 318         if ((long)delay < 0)
 319                 delay = 0;
 320
 321         mod_delayed_work(addr_wq, delayed_work, delay);
 322 }
 323
 324 static void queue_req(struct addr_req *req)
 325 {
 326         struct addr_req *temp_req;
 327
 328         mutex_lock(&lock);
 329         list_for_each_entry_reverse(temp_req, &req_list, list) {
 330                 if (time_after_eq(req->timeout, temp_req->timeout))
 331                         break;
 332         }
 333
 334         list_add(&req->list, &temp_req->list);
 335
 336         set_timeout(&req->work, req->timeout);
 337         mutex_unlock(&lock);
 338 }
 339
 340 static int ib_nl_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 341                           const void *daddr, u32 seq, u16 family)
 342 {
 343         if (rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))
 344                 return -EADDRNOTAVAIL;
 345
 346         /* We fill in what we can, the response will fill the rest */
 347         rdma_copy_addr(dev_addr, dst->dev, NULL);
 348         return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
 349 }
 350
 351 static int dst_fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 352                         const void *daddr)
 353 {
 354         struct neighbour *n;
 355         int ret;
 356
 357         n = dst_neigh_lookup(dst, daddr);
 358
 359         rcu_read_lock();
 360         if (!n || !(n->nud_state & NUD_VALID)) {
 361                 if (n)
 362                         neigh_event_send(n, NULL);
 363                 ret = -ENODATA;
 364         } else {
 365                 ret = rdma_copy_addr(dev_addr, dst->dev, n->ha);
 366         }
 367         rcu_read_unlock();
 368
 369         if (n)
 370                 neigh_release(n);
 371
 372         return ret;
 373 }
 374
 375 static bool has_gateway(struct dst_entry *dst, sa_family_t family)
 376 {
 377         struct rtable *rt;
 378         struct rt6_info *rt6;
 379
 380         if (family == AF_INET) {
 381                 rt = container_of(dst, struct rtable, dst);
 382                 return rt->rt_uses_gateway;
 383         }
 384
 385         rt6 = container_of(dst, struct rt6_info, dst);
 386         return rt6->rt6i_flags & RTF_GATEWAY;
 387 }
 388
 389 static int fetch_ha(struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 390                     const struct sockaddr *dst_in, u32 seq)
 391 {
 392         const struct sockaddr_in *dst_in4 =
 393                 (const struct sockaddr_in *)dst_in;
 394         const struct sockaddr_in6 *dst_in6 =
 395                 (const struct sockaddr_in6 *)dst_in;
 396         const void *daddr = (dst_in->sa_family == AF_INET) ?
 397                 (const void *)&dst_in4->sin_addr.s_addr :
 398                 (const void *)&dst_in6->sin6_addr;
 399         sa_family_t family = dst_in->sa_family;
 400
 401         /* Gateway + ARPHRD_INFINIBAND -> IB router */
 402         if (has_gateway(dst, family) && dst->dev->type == ARPHRD_INFINIBAND)
 403                 return ib_nl_fetch_ha(dst, dev_addr, daddr, seq, family);
 404         else
 405                 return dst_fetch_ha(dst, dev_addr, daddr);
 406 }
 407
 408 static int addr4_resolve(struct sockaddr_in *src_in,
 409                          const struct sockaddr_in *dst_in,
 410                          struct rdma_dev_addr *addr,
 411                          struct rtable **prt)
 412 {
 413         __be32 src_ip = src_in->sin_addr.s_addr;
 414         __be32 dst_ip = dst_in->sin_addr.s_addr;
 415         struct rtable *rt;
 416         struct flowi4 fl4;
 417         int ret;
 418
 419         memset(&fl4, 0, sizeof(fl4));
 420         fl4.daddr = dst_ip;
 421         fl4.saddr = src_ip;
 422         fl4.flowi4_oif = addr->bound_dev_if;
 423         rt = ip_route_output_key(addr->net, &fl4);
 424         ret = PTR_ERR_OR_ZERO(rt);
 425         if (ret)
 426                 return ret;
 427
 428         src_in->sin_family = AF_INET;
 429         src_in->sin_addr.s_addr = fl4.saddr;
 430
 431         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 432          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 433          * type accordingly.
 434          */
 435         if (rt->rt_uses_gateway && rt->dst.dev->type != ARPHRD_INFINIBAND)
 436                 addr->network = RDMA_NETWORK_IPV4;
 437
 438         addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
 439
 440         *prt = rt;
 441         return 0;
 442 }
 443
 444 #if IS_ENABLED(CONFIG_IPV6)
 445 static int addr6_resolve(struct sockaddr_in6 *src_in,
 446                          const struct sockaddr_in6 *dst_in,
 447                          struct rdma_dev_addr *addr,
 448                          struct dst_entry **pdst)
 449 {
 450         struct flowi6 fl6;
 451         struct dst_entry *dst;
 452         struct rt6_info *rt;
 453
 454         memset(&fl6, 0, sizeof fl6);
 455         fl6.daddr = dst_in->sin6_addr;
 456         fl6.saddr = src_in->sin6_addr;
 457         fl6.flowi6_oif = addr->bound_dev_if;
 458
 459         dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);
 460         if (IS_ERR(dst))
 461                 return PTR_ERR(dst);
 462
 463         rt = (struct rt6_info *)dst;
 464         if (ipv6_addr_any(&src_in->sin6_addr)) {
 465                 src_in->sin6_family = AF_INET6;
 466                 src_in->sin6_addr = fl6.saddr;
 467         }
 468
 469         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 470          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 471          * type accordingly.
 472          */
 473         if (rt->rt6i_flags & RTF_GATEWAY &&
 474             ip6_dst_idev(dst)->dev->type != ARPHRD_INFINIBAND)
 475                 addr->network = RDMA_NETWORK_IPV6;
 476
 477         addr->hoplimit = ip6_dst_hoplimit(dst);
 478
 479         *pdst = dst;
 480         return 0;
 481 }
 482 #else
 483 static int addr6_resolve(struct sockaddr_in6 *src_in,
 484                          const struct sockaddr_in6 *dst_in,
 485                          struct rdma_dev_addr *addr,
 486                          struct dst_entry **pdst)
 487 {
 488         return -EADDRNOTAVAIL;
 489 }
 490 #endif
 491
 492 static int addr_resolve_neigh(struct dst_entry *dst,
 493                               const struct sockaddr *dst_in,
 494                               struct rdma_dev_addr *addr,
 495                               u32 seq)
 496 {
 497         if (dst->dev->flags & IFF_LOOPBACK) {
 498                 int ret;
 499
 500                 ret = rdma_translate_ip(dst_in, addr, NULL);
 501                 if (!ret)
 502                         memcpy(addr->dst_dev_addr, addr->src_dev_addr,
 503                                MAX_ADDR_LEN);
 504
 505                 return ret;
 506         }
 507
 508         /* If the device doesn't do ARP internally */
 509         if (!(dst->dev->flags & IFF_NOARP))
 510                 return fetch_ha(dst, addr, dst_in, seq);
 511
 512         return rdma_copy_addr(addr, dst->dev, NULL);
 513 }
 514
 515 static int addr_resolve(struct sockaddr *src_in,
 516                         const struct sockaddr *dst_in,
 517                         struct rdma_dev_addr *addr,
 518                         bool resolve_neigh,
 519                         u32 seq)
 520 {
 521         struct net_device *ndev;
 522         struct dst_entry *dst;
 523         int ret;
 524
 525         if (!addr->net) {
 526                 pr_warn_ratelimited("%s: missing namespace\n", __func__);
 527                 return -EINVAL;
 528         }
 529
 530         if (src_in->sa_family == AF_INET) {
 531                 struct rtable *rt = NULL;
 532                 const struct sockaddr_in *dst_in4 =
 533                         (const struct sockaddr_in *)dst_in;
 534
 535                 ret = addr4_resolve((struct sockaddr_in *)src_in,
 536                                     dst_in4, addr, &rt);
 537                 if (ret)
 538                         return ret;
 539
 540                 if (resolve_neigh)
 541                         ret = addr_resolve_neigh(&rt->dst, dst_in, addr, seq);
 542
 543                 if (addr->bound_dev_if) {
 544                         ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 545                 } else {
 546                         ndev = rt->dst.dev;
 547                         dev_hold(ndev);
 548                 }
 549
 550                 ip_rt_put(rt);
 551         } else {
 552                 const struct sockaddr_in6 *dst_in6 =
 553                         (const struct sockaddr_in6 *)dst_in;
 554
 555                 ret = addr6_resolve((struct sockaddr_in6 *)src_in,
 556                                     dst_in6, addr,
 557                                     &dst);
 558                 if (ret)
 559                         return ret;
 560
 561                 if (resolve_neigh)
 562                         ret = addr_resolve_neigh(dst, dst_in, addr, seq);
 563
 564                 if (addr->bound_dev_if) {
 565                         ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 566                 } else {
 567                         ndev = dst->dev;
 568                         dev_hold(ndev);
 569                 }
 570
 571                 dst_release(dst);
 572         }
 573
 574         if (ndev->flags & IFF_LOOPBACK) {
 575                 ret = rdma_translate_ip(dst_in, addr, NULL);
 576                 /*
 577                  * Put the loopback device and get the translated
 578                  * device instead.
 579                  */
 580                 dev_put(ndev);
 581                 ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 582         } else {
 583                 addr->bound_dev_if = ndev->ifindex;
 584         }
 585         dev_put(ndev);
 586
 587         return ret;
 588 }
 589
 590 static void process_one_req(struct work_struct *_work)
 591 {
 592         struct addr_req *req;
 593         struct sockaddr *src_in, *dst_in;
 594
 595         mutex_lock(&lock);
 596         req = container_of(_work, struct addr_req, work.work);
 597
 598         if (req->status == -ENODATA) {
 599                 src_in = (struct sockaddr *)&req->src_addr;
 600                 dst_in = (struct sockaddr *)&req->dst_addr;
 601                 req->status = addr_resolve(src_in, dst_in, req->addr,
 602                                            true, req->seq);
 603                 if (req->status && time_after_eq(jiffies, req->timeout)) {
 604                         req->status = -ETIMEDOUT;
 605                 } else if (req->status == -ENODATA) {
 606                         /* requeue the work for retrying again */
 607                         set_timeout(&req->work, req->timeout);
 608                         mutex_unlock(&lock);
 609                         return;
 610                 }
 611         }
 612         list_del(&req->list);
 613         mutex_unlock(&lock);
 614
 615         /*
 616          * Although the work will normally have been canceled by the
 617          * workqueue, it can still be requeued as long as it is on the
 618          * req_list, so it could have been requeued before we grabbed &lock.
 619          * We need to cancel it after it is removed from req_list to really be
 620          * sure it is safe to free.
 621          */
 622         cancel_delayed_work(&req->work);
 623
 624         req->callback(req->status, (struct sockaddr *)&req->src_addr,
 625                 req->addr, req->context);
 626         put_client(req->client);
 627         kfree(req);
 628 }
 629
 630 static void process_req(struct work_struct *work)
 631 {
 632         struct addr_req *req, *temp_req;
 633         struct sockaddr *src_in, *dst_in;
 634         struct list_head done_list;
 635
 636         INIT_LIST_HEAD(&done_list);
 637
 638         mutex_lock(&lock);
 639         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 640                 if (req->status == -ENODATA) {
 641                         src_in = (struct sockaddr *) &req->src_addr;
 642                         dst_in = (struct sockaddr *) &req->dst_addr;
 643                         req->status = addr_resolve(src_in, dst_in, req->addr,
 644                                                    true, req->seq);
 645                         if (req->status && time_after_eq(jiffies, req->timeout))
 646                                 req->status = -ETIMEDOUT;
 647                         else if (req->status == -ENODATA) {
 648                                 set_timeout(&req->work, req->timeout);
 649                                 continue;
 650                         }
 651                 }
 652                 list_move_tail(&req->list, &done_list);
 653         }
 654
 655         mutex_unlock(&lock);
 656
 657         list_for_each_entry_safe(req, temp_req, &done_list, list) {
 658                 list_del(&req->list);
 659                 /* It is safe to cancel other work items from this work item
 660                  * because at a time there can be only one work item running
 661                  * with this single threaded work queue.
 662                  */
 663                 cancel_delayed_work(&req->work);
 664                 req->callback(req->status, (struct sockaddr *) &req->src_addr,
 665                         req->addr, req->context);
 666                 put_client(req->client);
 667                 kfree(req);
 668         }
 669 }
 670
 671 int rdma_resolve_ip(struct rdma_addr_client *client,
 672                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
 673                     struct rdma_dev_addr *addr, int timeout_ms,
 674                     void (*callback)(int status, struct sockaddr *src_addr,
 675                                      struct rdma_dev_addr *addr, void *context),
 676                     void *context)
 677 {
 678         struct sockaddr *src_in, *dst_in;
 679         struct addr_req *req;
 680         int ret = 0;
 681
 682         req = kzalloc(sizeof *req, GFP_KERNEL);
 683         if (!req)
 684                 return -ENOMEM;
 685
 686         src_in = (struct sockaddr *) &req->src_addr;
 687         dst_in = (struct sockaddr *) &req->dst_addr;
 688
 689         if (src_addr) {
 690                 if (src_addr->sa_family != dst_addr->sa_family) {
 691                         ret = -EINVAL;
 692                         goto err;
 693                 }
 694
 695                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 696         } else {
 697                 src_in->sa_family = dst_addr->sa_family;
 698         }
 699
 700         memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
 701         req->addr = addr;
 702         req->callback = callback;
 703         req->context = context;
 704         req->client = client;
 705         atomic_inc(&client->refcount);
 706         INIT_DELAYED_WORK(&req->work, process_one_req);
 707         req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
 708
 709         req->status = addr_resolve(src_in, dst_in, addr, true, req->seq);
 710         switch (req->status) {
 711         case 0:
 712                 req->timeout = jiffies;
 713                 queue_req(req);
 714                 break;
 715         case -ENODATA:
 716                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
 717                 queue_req(req);
 718                 break;
 719         default:
 720                 ret = req->status;
 721                 atomic_dec(&client->refcount);
 722                 goto err;
 723         }
 724         return ret;
 725 err:
 726         kfree(req);
 727         return ret;
 728 }
 729 EXPORT_SYMBOL(rdma_resolve_ip);
 730
 731 int rdma_resolve_ip_route(struct sockaddr *src_addr,
 732                           const struct sockaddr *dst_addr,
 733                           struct rdma_dev_addr *addr)
 734 {
 735         struct sockaddr_storage ssrc_addr = {};
 736         struct sockaddr *src_in = (struct sockaddr *)&ssrc_addr;
 737
 738         if (src_addr) {
 739                 if (src_addr->sa_family != dst_addr->sa_family)
 740                         return -EINVAL;
 741
 742                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 743         } else {
 744                 src_in->sa_family = dst_addr->sa_family;
 745         }
 746
 747         return addr_resolve(src_in, dst_addr, addr, false, 0);
 748 }
 749 EXPORT_SYMBOL(rdma_resolve_ip_route);
 750
 751 void rdma_addr_cancel(struct rdma_dev_addr *addr)
 752 {
 753         struct addr_req *req, *temp_req;
 754
 755         mutex_lock(&lock);
 756         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 757                 if (req->addr == addr) {
 758                         req->status = -ECANCELED;
 759                         req->timeout = jiffies;
 760                         list_move(&req->list, &req_list);
 761                         set_timeout(&req->work, req->timeout);
 762                         break;
 763                 }
 764         }
 765         mutex_unlock(&lock);
 766 }
 767 EXPORT_SYMBOL(rdma_addr_cancel);
 768
 769 struct resolve_cb_context {
 770         struct rdma_dev_addr *addr;
 771         struct completion comp;
 772         int status;
 773 };
 774
 775 static void resolve_cb(int status, struct sockaddr *src_addr,
 776              struct rdma_dev_addr *addr, void *context)
 777 {
 778         if (!status)
 779                 memcpy(((struct resolve_cb_context *)context)->addr,
 780                        addr, sizeof(struct rdma_dev_addr));
 781         ((struct resolve_cb_context *)context)->status = status;
 782         complete(&((struct resolve_cb_context *)context)->comp);
 783 }
 784
 785 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 786                                  const union ib_gid *dgid,
 787                                  u8 *dmac, u16 *vlan_id, int *if_index,
 788                                  int *hoplimit)
 789 {
 790         int ret = 0;
 791         struct rdma_dev_addr dev_addr;
 792         struct resolve_cb_context ctx;
 793         struct net_device *dev;
 794
 795         union {
 796                 struct sockaddr_in  _sockaddr_in;
 797                 struct sockaddr_in6 _sockaddr_in6;
 798         } sgid_addr, dgid_addr;
 799
 800
 801         rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
 802         rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);
 803
 804         memset(&dev_addr, 0, sizeof(dev_addr));
 805         if (if_index)
 806                 dev_addr.bound_dev_if = *if_index;
 807         dev_addr.net = &init_net;
 808
 809         ctx.addr = &dev_addr;
 810         init_completion(&ctx.comp);
 811         ret = rdma_resolve_ip(&self, (struct sockaddr *)&sgid_addr,
 812                               (struct sockaddr *)&dgid_addr, &dev_addr, 1000,
 813                               resolve_cb, &ctx);
 814         if (ret)
 815                 return ret;
 816
 817         wait_for_completion(&ctx.comp);
 818
 819         ret = ctx.status;
 820         if (ret)
 821                 return ret;
 822
 823         memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
 824         dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if);
 825         if (!dev)
 826                 return -ENODEV;
 827         if (if_index)
 828                 *if_index = dev_addr.bound_dev_if;
 829         if (vlan_id)
 830                 *vlan_id = rdma_vlan_dev_vlan_id(dev);
 831         if (hoplimit)
 832                 *hoplimit = dev_addr.hoplimit;
 833         dev_put(dev);
 834         return ret;
 835 }
 836 EXPORT_SYMBOL(rdma_addr_find_l2_eth_by_grh);
 837
 838 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id)
 839 {
 840         int ret = 0;
 841         struct rdma_dev_addr dev_addr;
 842         union {
 843                 struct sockaddr_in  _sockaddr_in;
 844                 struct sockaddr_in6 _sockaddr_in6;
 845         } gid_addr;
 846
 847         rdma_gid2ip((struct sockaddr *)&gid_addr, sgid);
 848
 849         memset(&dev_addr, 0, sizeof(dev_addr));
 850         dev_addr.net = &init_net;
 851         ret = rdma_translate_ip((struct sockaddr *)&gid_addr, &dev_addr, vlan_id);
 852         if (ret)
 853                 return ret;
 854
 855         memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN);
 856         return ret;
 857 }
 858 EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid);
 859
 860 static int netevent_callback(struct notifier_block *self, unsigned long event,
 861         void *ctx)
 862 {
 863         if (event == NETEVENT_NEIGH_UPDATE) {
 864                 struct neighbour *neigh = ctx;
 865
 866                 if (neigh->nud_state & NUD_VALID)
 867                         set_timeout(&work, jiffies);
 868         }
 869         return 0;
 870 }
 871
 872 static struct notifier_block nb = {
 873         .notifier_call = netevent_callback
 874 };
 875
 876 int addr_init(void)
 877 {
 878         addr_wq = alloc_ordered_workqueue("ib_addr", 0);
 879         if (!addr_wq)
 880                 return -ENOMEM;
 881
 882         register_netevent_notifier(&nb);
 883         rdma_addr_register_client(&self);
 884
 885         return 0;
 886 }
 887
 888 void addr_cleanup(void)
 889 {
 890         rdma_addr_unregister_client(&self);
 891         unregister_netevent_notifier(&nb);
 892         destroy_workqueue(addr_wq);
 893 }