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         void *context;
  60         void (*callback)(int status, struct sockaddr *src_addr,
  61                          struct rdma_dev_addr *addr, void *context);
  62         unsigned long timeout;
  63         struct delayed_work work;
  64         int status;
  65         u32 seq;
  66 };
  67
  68 static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);
  69
  70 static DEFINE_SPINLOCK(lock);
  71 static LIST_HEAD(req_list);
  72 static struct workqueue_struct *addr_wq;
  73
  74 static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
  75         [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
  76                 .len = sizeof(struct rdma_nla_ls_gid)},
  77 };
  78
  79 static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
  80 {
  81         struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
  82         int ret;
  83
  84         if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
  85                 return false;
  86
  87         ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
  88                         nlmsg_len(nlh), ib_nl_addr_policy, NULL);
  89         if (ret)
  90                 return false;
  91
  92         return true;
  93 }
  94
  95 static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
  96 {
  97         const struct nlattr *head, *curr;
  98         union ib_gid gid;
  99         struct addr_req *req;
 100         int len, rem;
 101         int found = 0;
 102
 103         head = (const struct nlattr *)nlmsg_data(nlh);
 104         len = nlmsg_len(nlh);
 105
 106         nla_for_each_attr(curr, head, len, rem) {
 107                 if (curr->nla_type == LS_NLA_TYPE_DGID)
 108                         memcpy(&gid, nla_data(curr), nla_len(curr));
 109         }
 110
 111         spin_lock_bh(&lock);
 112         list_for_each_entry(req, &req_list, list) {
 113                 if (nlh->nlmsg_seq != req->seq)
 114                         continue;
 115                 /* We set the DGID part, the rest was set earlier */
 116                 rdma_addr_set_dgid(req->addr, &gid);
 117                 req->status = 0;
 118                 found = 1;
 119                 break;
 120         }
 121         spin_unlock_bh(&lock);
 122
 123         if (!found)
 124                 pr_info("Couldn't find request waiting for DGID: %pI6\n",
 125                         &gid);
 126 }
 127
 128 int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
 129                              struct nlmsghdr *nlh,
 130                              struct netlink_ext_ack *extack)
 131 {
 132         if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
 133             !(NETLINK_CB(skb).sk))
 134                 return -EPERM;
 135
 136         if (ib_nl_is_good_ip_resp(nlh))
 137                 ib_nl_process_good_ip_rsep(nlh);
 138
 139         return 0;
 140 }
 141
 142 static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
 143                              const void *daddr,
 144                              u32 seq, u16 family)
 145 {
 146         struct sk_buff *skb = NULL;
 147         struct nlmsghdr *nlh;
 148         struct rdma_ls_ip_resolve_header *header;
 149         void *data;
 150         size_t size;
 151         int attrtype;
 152         int len;
 153
 154         if (family == AF_INET) {
 155                 size = sizeof(struct in_addr);
 156                 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
 157         } else {
 158                 size = sizeof(struct in6_addr);
 159                 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
 160         }
 161
 162         len = nla_total_size(sizeof(size));
 163         len += NLMSG_ALIGN(sizeof(*header));
 164
 165         skb = nlmsg_new(len, GFP_KERNEL);
 166         if (!skb)
 167                 return -ENOMEM;
 168
 169         data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
 170                             RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
 171         if (!data) {
 172                 nlmsg_free(skb);
 173                 return -ENODATA;
 174         }
 175
 176         /* Construct the family header first */
 177         header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
 178         header->ifindex = dev_addr->bound_dev_if;
 179         nla_put(skb, attrtype, size, daddr);
 180
 181         /* Repair the nlmsg header length */
 182         nlmsg_end(skb, nlh);
 183         rdma_nl_multicast(skb, RDMA_NL_GROUP_LS, GFP_KERNEL);
 184
 185         /* Make the request retry, so when we get the response from userspace
 186          * we will have something.
 187          */
 188         return -ENODATA;
 189 }
 190
 191 int rdma_addr_size(const struct sockaddr *addr)
 192 {
 193         switch (addr->sa_family) {
 194         case AF_INET:
 195                 return sizeof(struct sockaddr_in);
 196         case AF_INET6:
 197                 return sizeof(struct sockaddr_in6);
 198         case AF_IB:
 199                 return sizeof(struct sockaddr_ib);
 200         default:
 201                 return 0;
 202         }
 203 }
 204 EXPORT_SYMBOL(rdma_addr_size);
 205
 206 int rdma_addr_size_in6(struct sockaddr_in6 *addr)
 207 {
 208         int ret = rdma_addr_size((struct sockaddr *) addr);
 209
 210         return ret <= sizeof(*addr) ? ret : 0;
 211 }
 212 EXPORT_SYMBOL(rdma_addr_size_in6);
 213
 214 int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)
 215 {
 216         int ret = rdma_addr_size((struct sockaddr *) addr);
 217
 218         return ret <= sizeof(*addr) ? ret : 0;
 219 }
 220 EXPORT_SYMBOL(rdma_addr_size_kss);
 221
 222 void rdma_copy_addr(struct rdma_dev_addr *dev_addr,
 223                     const struct net_device *dev,
 224                     const unsigned char *dst_dev_addr)
 225 {
 226         dev_addr->dev_type = dev->type;
 227         memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 228         memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
 229         if (dst_dev_addr)
 230                 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, MAX_ADDR_LEN);
 231         dev_addr->bound_dev_if = dev->ifindex;
 232 }
 233 EXPORT_SYMBOL(rdma_copy_addr);
 234
 235 int rdma_translate_ip(const struct sockaddr *addr,
 236                       struct rdma_dev_addr *dev_addr)
 237 {
 238         struct net_device *dev;
 239
 240         if (dev_addr->bound_dev_if) {
 241                 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
 242                 if (!dev)
 243                         return -ENODEV;
 244                 rdma_copy_addr(dev_addr, dev, NULL);
 245                 dev_put(dev);
 246                 return 0;
 247         }
 248
 249         switch (addr->sa_family) {
 250         case AF_INET:
 251                 dev = ip_dev_find(dev_addr->net,
 252                         ((const struct sockaddr_in *)addr)->sin_addr.s_addr);
 253
 254                 if (!dev)
 255                         return -EADDRNOTAVAIL;
 256
 257                 rdma_copy_addr(dev_addr, dev, NULL);
 258                 dev_put(dev);
 259                 break;
 260 #if IS_ENABLED(CONFIG_IPV6)
 261         case AF_INET6:
 262                 rcu_read_lock();
 263                 for_each_netdev_rcu(dev_addr->net, dev) {
 264                         if (ipv6_chk_addr(dev_addr->net,
 265                                           &((const struct sockaddr_in6 *)addr)->sin6_addr,
 266                                           dev, 1)) {
 267                                 rdma_copy_addr(dev_addr, dev, NULL);
 268                                 break;
 269                         }
 270                 }
 271                 rcu_read_unlock();
 272                 break;
 273 #endif
 274         }
 275         return 0;
 276 }
 277 EXPORT_SYMBOL(rdma_translate_ip);
 278
 279 static void set_timeout(struct addr_req *req, unsigned long time)
 280 {
 281         unsigned long delay;
 282
 283         delay = time - jiffies;
 284         if ((long)delay < 0)
 285                 delay = 0;
 286
 287         mod_delayed_work(addr_wq, &req->work, delay);
 288 }
 289
 290 static void queue_req(struct addr_req *req)
 291 {
 292         spin_lock_bh(&lock);
 293         list_add_tail(&req->list, &req_list);
 294         set_timeout(req, req->timeout);
 295         spin_unlock_bh(&lock);
 296 }
 297
 298 static int ib_nl_fetch_ha(const struct dst_entry *dst,
 299                           struct rdma_dev_addr *dev_addr,
 300                           const void *daddr, u32 seq, u16 family)
 301 {
 302         if (rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))
 303                 return -EADDRNOTAVAIL;
 304
 305         /* We fill in what we can, the response will fill the rest */
 306         rdma_copy_addr(dev_addr, dst->dev, NULL);
 307         return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
 308 }
 309
 310 static int dst_fetch_ha(const struct dst_entry *dst,
 311                         struct rdma_dev_addr *dev_addr,
 312                         const void *daddr)
 313 {
 314         struct neighbour *n;
 315         int ret = 0;
 316
 317         n = dst_neigh_lookup(dst, daddr);
 318         if (!n)
 319                 return -ENODATA;
 320
 321         if (!(n->nud_state & NUD_VALID)) {
 322                 neigh_event_send(n, NULL);
 323                 ret = -ENODATA;
 324         } else {
 325                 rdma_copy_addr(dev_addr, dst->dev, n->ha);
 326         }
 327
 328         neigh_release(n);
 329
 330         return ret;
 331 }
 332
 333 static bool has_gateway(const struct dst_entry *dst, sa_family_t family)
 334 {
 335         struct rtable *rt;
 336         struct rt6_info *rt6;
 337
 338         if (family == AF_INET) {
 339                 rt = container_of(dst, struct rtable, dst);
 340                 return rt->rt_uses_gateway;
 341         }
 342
 343         rt6 = container_of(dst, struct rt6_info, dst);
 344         return rt6->rt6i_flags & RTF_GATEWAY;
 345 }
 346
 347 static int fetch_ha(const struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 348                     const struct sockaddr *dst_in, u32 seq)
 349 {
 350         const struct sockaddr_in *dst_in4 =
 351                 (const struct sockaddr_in *)dst_in;
 352         const struct sockaddr_in6 *dst_in6 =
 353                 (const struct sockaddr_in6 *)dst_in;
 354         const void *daddr = (dst_in->sa_family == AF_INET) ?
 355                 (const void *)&dst_in4->sin_addr.s_addr :
 356                 (const void *)&dst_in6->sin6_addr;
 357         sa_family_t family = dst_in->sa_family;
 358
 359         /* Gateway + ARPHRD_INFINIBAND -> IB router */
 360         if (has_gateway(dst, family) && dst->dev->type == ARPHRD_INFINIBAND)
 361                 return ib_nl_fetch_ha(dst, dev_addr, daddr, seq, family);
 362         else
 363                 return dst_fetch_ha(dst, dev_addr, daddr);
 364 }
 365
 366 static int addr4_resolve(struct sockaddr_in *src_in,
 367                          const struct sockaddr_in *dst_in,
 368                          struct rdma_dev_addr *addr,
 369                          struct rtable **prt)
 370 {
 371         __be32 src_ip = src_in->sin_addr.s_addr;
 372         __be32 dst_ip = dst_in->sin_addr.s_addr;
 373         struct rtable *rt;
 374         struct flowi4 fl4;
 375         int ret;
 376
 377         memset(&fl4, 0, sizeof(fl4));
 378         fl4.daddr = dst_ip;
 379         fl4.saddr = src_ip;
 380         fl4.flowi4_oif = addr->bound_dev_if;
 381         rt = ip_route_output_key(addr->net, &fl4);
 382         ret = PTR_ERR_OR_ZERO(rt);
 383         if (ret)
 384                 return ret;
 385
 386         src_in->sin_family = AF_INET;
 387         src_in->sin_addr.s_addr = fl4.saddr;
 388
 389         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 390          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 391          * type accordingly.
 392          */
 393         if (rt->rt_uses_gateway && rt->dst.dev->type != ARPHRD_INFINIBAND)
 394                 addr->network = RDMA_NETWORK_IPV4;
 395
 396         addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
 397
 398         *prt = rt;
 399         return 0;
 400 }
 401
 402 #if IS_ENABLED(CONFIG_IPV6)
 403 static int addr6_resolve(struct sockaddr_in6 *src_in,
 404                          const struct sockaddr_in6 *dst_in,
 405                          struct rdma_dev_addr *addr,
 406                          struct dst_entry **pdst)
 407 {
 408         struct flowi6 fl6;
 409         struct dst_entry *dst;
 410         struct rt6_info *rt;
 411
 412         memset(&fl6, 0, sizeof fl6);
 413         fl6.daddr = dst_in->sin6_addr;
 414         fl6.saddr = src_in->sin6_addr;
 415         fl6.flowi6_oif = addr->bound_dev_if;
 416
 417         dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);
 418         if (IS_ERR(dst))
 419                 return PTR_ERR(dst);
 420
 421         rt = (struct rt6_info *)dst;
 422         if (ipv6_addr_any(&src_in->sin6_addr)) {
 423                 src_in->sin6_family = AF_INET6;
 424                 src_in->sin6_addr = fl6.saddr;
 425         }
 426
 427         /* If there's a gateway and type of device not ARPHRD_INFINIBAND, we're
 428          * definitely in RoCE v2 (as RoCE v1 isn't routable) set the network
 429          * type accordingly.
 430          */
 431         if (rt->rt6i_flags & RTF_GATEWAY &&
 432             ip6_dst_idev(dst)->dev->type != ARPHRD_INFINIBAND)
 433                 addr->network = RDMA_NETWORK_IPV6;
 434
 435         addr->hoplimit = ip6_dst_hoplimit(dst);
 436
 437         *pdst = dst;
 438         return 0;
 439 }
 440 #else
 441 static int addr6_resolve(struct sockaddr_in6 *src_in,
 442                          const struct sockaddr_in6 *dst_in,
 443                          struct rdma_dev_addr *addr,
 444                          struct dst_entry **pdst)
 445 {
 446         return -EADDRNOTAVAIL;
 447 }
 448 #endif
 449
 450 static int addr_resolve_neigh(const struct dst_entry *dst,
 451                               const struct sockaddr *dst_in,
 452                               struct rdma_dev_addr *addr,
 453                               u32 seq)
 454 {
 455         if (dst->dev->flags & IFF_LOOPBACK) {
 456                 int ret;
 457
 458                 ret = rdma_translate_ip(dst_in, addr);
 459                 if (!ret)
 460                         memcpy(addr->dst_dev_addr, addr->src_dev_addr,
 461                                MAX_ADDR_LEN);
 462
 463                 return ret;
 464         }
 465
 466         /* If the device doesn't do ARP internally */
 467         if (!(dst->dev->flags & IFF_NOARP))
 468                 return fetch_ha(dst, addr, dst_in, seq);
 469
 470         rdma_copy_addr(addr, dst->dev, NULL);
 471
 472         return 0;
 473 }
 474
 475 static int addr_resolve(struct sockaddr *src_in,
 476                         const struct sockaddr *dst_in,
 477                         struct rdma_dev_addr *addr,
 478                         bool resolve_neigh,
 479                         u32 seq)
 480 {
 481         struct net_device *ndev;
 482         struct dst_entry *dst;
 483         int ret;
 484
 485         if (!addr->net) {
 486                 pr_warn_ratelimited("%s: missing namespace\n", __func__);
 487                 return -EINVAL;
 488         }
 489
 490         if (src_in->sa_family == AF_INET) {
 491                 struct rtable *rt = NULL;
 492                 const struct sockaddr_in *dst_in4 =
 493                         (const struct sockaddr_in *)dst_in;
 494
 495                 ret = addr4_resolve((struct sockaddr_in *)src_in,
 496                                     dst_in4, addr, &rt);
 497                 if (ret)
 498                         return ret;
 499
 500                 if (resolve_neigh)
 501                         ret = addr_resolve_neigh(&rt->dst, dst_in, addr, seq);
 502
 503                 if (addr->bound_dev_if) {
 504                         ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 505                 } else {
 506                         ndev = rt->dst.dev;
 507                         dev_hold(ndev);
 508                 }
 509
 510                 ip_rt_put(rt);
 511         } else {
 512                 const struct sockaddr_in6 *dst_in6 =
 513                         (const struct sockaddr_in6 *)dst_in;
 514
 515                 ret = addr6_resolve((struct sockaddr_in6 *)src_in,
 516                                     dst_in6, addr,
 517                                     &dst);
 518                 if (ret)
 519                         return ret;
 520
 521                 if (resolve_neigh)
 522                         ret = addr_resolve_neigh(dst, dst_in, addr, seq);
 523
 524                 if (addr->bound_dev_if) {
 525                         ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
 526                 } else {
 527                         ndev = dst->dev;
 528                         dev_hold(ndev);
 529                 }
 530
 531                 dst_release(dst);
 532         }
 533
 534         if (ndev) {
 535                 if (ndev->flags & IFF_LOOPBACK)
 536                         ret = rdma_translate_ip(dst_in, addr);
 537                 else
 538                         addr->bound_dev_if = ndev->ifindex;
 539                 dev_put(ndev);
 540         }
 541
 542         return ret;
 543 }
 544
 545 static void process_one_req(struct work_struct *_work)
 546 {
 547         struct addr_req *req;
 548         struct sockaddr *src_in, *dst_in;
 549
 550         req = container_of(_work, struct addr_req, work.work);
 551
 552         if (req->status == -ENODATA) {
 553                 src_in = (struct sockaddr *)&req->src_addr;
 554                 dst_in = (struct sockaddr *)&req->dst_addr;
 555                 req->status = addr_resolve(src_in, dst_in, req->addr,
 556                                            true, req->seq);
 557                 if (req->status && time_after_eq(jiffies, req->timeout)) {
 558                         req->status = -ETIMEDOUT;
 559                 } else if (req->status == -ENODATA) {
 560                         /* requeue the work for retrying again */
 561                         spin_lock_bh(&lock);
 562                         if (!list_empty(&req->list))
 563                                 set_timeout(req, req->timeout);
 564                         spin_unlock_bh(&lock);
 565                         return;
 566                 }
 567         }
 568
 569         req->callback(req->status, (struct sockaddr *)&req->src_addr,
 570                 req->addr, req->context);
 571         req->callback = NULL;
 572
 573         spin_lock_bh(&lock);
 574         if (!list_empty(&req->list)) {
 575                 /*
 576                  * Although the work will normally have been canceled by the
 577                  * workqueue, it can still be requeued as long as it is on the
 578                  * req_list.
 579                  */
 580                 cancel_delayed_work(&req->work);
 581                 list_del_init(&req->list);
 582                 kfree(req);
 583         }
 584         spin_unlock_bh(&lock);
 585 }
 586
 587 int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
 588                     struct rdma_dev_addr *addr, int timeout_ms,
 589                     void (*callback)(int status, struct sockaddr *src_addr,
 590                                      struct rdma_dev_addr *addr, void *context),
 591                     void *context)
 592 {
 593         struct sockaddr *src_in, *dst_in;
 594         struct addr_req *req;
 595         int ret = 0;
 596
 597         req = kzalloc(sizeof *req, GFP_KERNEL);
 598         if (!req)
 599                 return -ENOMEM;
 600
 601         src_in = (struct sockaddr *) &req->src_addr;
 602         dst_in = (struct sockaddr *) &req->dst_addr;
 603
 604         if (src_addr) {
 605                 if (src_addr->sa_family != dst_addr->sa_family) {
 606                         ret = -EINVAL;
 607                         goto err;
 608                 }
 609
 610                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 611         } else {
 612                 src_in->sa_family = dst_addr->sa_family;
 613         }
 614
 615         memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
 616         req->addr = addr;
 617         req->callback = callback;
 618         req->context = context;
 619         INIT_DELAYED_WORK(&req->work, process_one_req);
 620         req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
 621
 622         req->status = addr_resolve(src_in, dst_in, addr, true, req->seq);
 623         switch (req->status) {
 624         case 0:
 625                 req->timeout = jiffies;
 626                 queue_req(req);
 627                 break;
 628         case -ENODATA:
 629                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
 630                 queue_req(req);
 631                 break;
 632         default:
 633                 ret = req->status;
 634                 goto err;
 635         }
 636         return ret;
 637 err:
 638         kfree(req);
 639         return ret;
 640 }
 641 EXPORT_SYMBOL(rdma_resolve_ip);
 642
 643 int rdma_resolve_ip_route(struct sockaddr *src_addr,
 644                           const struct sockaddr *dst_addr,
 645                           struct rdma_dev_addr *addr)
 646 {
 647         struct sockaddr_storage ssrc_addr = {};
 648         struct sockaddr *src_in = (struct sockaddr *)&ssrc_addr;
 649
 650         if (src_addr) {
 651                 if (src_addr->sa_family != dst_addr->sa_family)
 652                         return -EINVAL;
 653
 654                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 655         } else {
 656                 src_in->sa_family = dst_addr->sa_family;
 657         }
 658
 659         return addr_resolve(src_in, dst_addr, addr, false, 0);
 660 }
 661
 662 void rdma_addr_cancel(struct rdma_dev_addr *addr)
 663 {
 664         struct addr_req *req, *temp_req;
 665         struct addr_req *found = NULL;
 666
 667         spin_lock_bh(&lock);
 668         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 669                 if (req->addr == addr) {
 670                         /*
 671                          * Removing from the list means we take ownership of
 672                          * the req
 673                          */
 674                         list_del_init(&req->list);
 675                         found = req;
 676                         break;
 677                 }
 678         }
 679         spin_unlock_bh(&lock);
 680
 681         if (!found)
 682                 return;
 683
 684         /*
 685          * sync canceling the work after removing it from the req_list
 686          * guarentees no work is running and none will be started.
 687          */
 688         cancel_delayed_work_sync(&found->work);
 689
 690         if (found->callback)
 691                 found->callback(-ECANCELED, (struct sockaddr *)&found->src_addr,
 692                               found->addr, found->context);
 693
 694         kfree(found);
 695 }
 696 EXPORT_SYMBOL(rdma_addr_cancel);
 697
 698 struct resolve_cb_context {
 699         struct completion comp;
 700         int status;
 701 };
 702
 703 static void resolve_cb(int status, struct sockaddr *src_addr,
 704              struct rdma_dev_addr *addr, void *context)
 705 {
 706         ((struct resolve_cb_context *)context)->status = status;
 707         complete(&((struct resolve_cb_context *)context)->comp);
 708 }
 709
 710 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 711                                  const union ib_gid *dgid,
 712                                  u8 *dmac, const struct net_device *ndev,
 713                                  int *hoplimit)
 714 {
 715         struct rdma_dev_addr dev_addr;
 716         struct resolve_cb_context ctx;
 717         union {
 718                 struct sockaddr_in  _sockaddr_in;
 719                 struct sockaddr_in6 _sockaddr_in6;
 720         } sgid_addr, dgid_addr;
 721         int ret;
 722
 723         rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
 724         rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);
 725
 726         memset(&dev_addr, 0, sizeof(dev_addr));
 727         dev_addr.bound_dev_if = ndev->ifindex;
 728         dev_addr.net = &init_net;
 729
 730         init_completion(&ctx.comp);
 731         ret = rdma_resolve_ip((struct sockaddr *)&sgid_addr,
 732                               (struct sockaddr *)&dgid_addr, &dev_addr, 1000,
 733                               resolve_cb, &ctx);
 734         if (ret)
 735                 return ret;
 736
 737         wait_for_completion(&ctx.comp);
 738
 739         ret = ctx.status;
 740         if (ret)
 741                 return ret;
 742
 743         memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
 744         *hoplimit = dev_addr.hoplimit;
 745         return 0;
 746 }
 747
 748 static int netevent_callback(struct notifier_block *self, unsigned long event,
 749         void *ctx)
 750 {
 751         struct addr_req *req;
 752
 753         if (event == NETEVENT_NEIGH_UPDATE) {
 754                 struct neighbour *neigh = ctx;
 755
 756                 if (neigh->nud_state & NUD_VALID) {
 757                         spin_lock_bh(&lock);
 758                         list_for_each_entry(req, &req_list, list)
 759                                 set_timeout(req, jiffies);
 760                         spin_unlock_bh(&lock);
 761                 }
 762         }
 763         return 0;
 764 }
 765
 766 static struct notifier_block nb = {
 767         .notifier_call = netevent_callback
 768 };
 769
 770 int addr_init(void)
 771 {
 772         addr_wq = alloc_ordered_workqueue("ib_addr", 0);
 773         if (!addr_wq)
 774                 return -ENOMEM;
 775
 776         register_netevent_notifier(&nb);
 777
 778         return 0;
 779 }
 780
 781 void addr_cleanup(void)
 782 {
 783         unregister_netevent_notifier(&nb);
 784         destroy_workqueue(addr_wq);
 785         WARN_ON(!list_empty(&req_list));
 786 }