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 <net/arp.h>
  41 #include <net/neighbour.h>
  42 #include <net/route.h>
  43 #include <net/netevent.h>
  44 #include <net/ipv6_stubs.h>
  45 #include <net/ip6_route.h>
  46 #include <rdma/ib_addr.h>
  47 #include <rdma/ib_cache.h>
  48 #include <rdma/ib_sa.h>
  49 #include <rdma/ib.h>
  50 #include <rdma/rdma_netlink.h>
  51 #include <net/netlink.h>
  52
  53 #include "core_priv.h"
  54
  55 struct addr_req {
  56         struct list_head list;
  57         struct sockaddr_storage src_addr;
  58         struct sockaddr_storage dst_addr;
  59         struct rdma_dev_addr *addr;
  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         bool resolve_by_gid_attr;       /* Consider gid attr in resolve phase */
  66         int status;
  67         u32 seq;
  68 };
  69
  70 static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);
  71
  72 static DEFINE_SPINLOCK(lock);
  73 static LIST_HEAD(req_list);
  74 static struct workqueue_struct *addr_wq;
  75
  76 static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
  77         [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
  78                 .len = sizeof(struct rdma_nla_ls_gid),
  79                 .validation_type = NLA_VALIDATE_MIN,
  80                 .min = 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_deprecated(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         spin_lock_bh(&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         spin_unlock_bh(&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(&init_net, 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(const 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 /**
 227  * rdma_copy_src_l2_addr - Copy netdevice source addresses
 228  * @dev_addr:   Destination address pointer where to copy the addresses
 229  * @dev:        Netdevice whose source addresses to copy
 230  *
 231  * rdma_copy_src_l2_addr() copies source addresses from the specified netdevice.
 232  * This includes unicast address, broadcast address, device type and
 233  * interface index.
 234  */
 235 void rdma_copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
 236                            const struct net_device *dev)
 237 {
 238         dev_addr->dev_type = dev->type;
 239         memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
 240         memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
 241         dev_addr->bound_dev_if = dev->ifindex;
 242 }
 243 EXPORT_SYMBOL(rdma_copy_src_l2_addr);
 244
 245 static struct net_device *
 246 rdma_find_ndev_for_src_ip_rcu(struct net *net, const struct sockaddr *src_in)
 247 {
 248         struct net_device *dev = NULL;
 249         int ret = -EADDRNOTAVAIL;
 250
 251         switch (src_in->sa_family) {
 252         case AF_INET:
 253                 dev = __ip_dev_find(net,
 254                                     ((const struct sockaddr_in *)src_in)->sin_addr.s_addr,
 255                                     false);
 256                 if (dev)
 257                         ret = 0;
 258                 break;
 259 #if IS_ENABLED(CONFIG_IPV6)
 260         case AF_INET6:
 261                 for_each_netdev_rcu(net, dev) {
 262                         if (ipv6_chk_addr(net,
 263                                           &((const struct sockaddr_in6 *)src_in)->sin6_addr,
 264                                           dev, 1)) {
 265                                 ret = 0;
 266                                 break;
 267                         }
 268                 }
 269                 break;
 270 #endif
 271         }
 272         return ret ? ERR_PTR(ret) : dev;
 273 }
 274
 275 int rdma_translate_ip(const struct sockaddr *addr,
 276                       struct rdma_dev_addr *dev_addr)
 277 {
 278         struct net_device *dev;
 279
 280         if (dev_addr->bound_dev_if) {
 281                 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
 282                 if (!dev)
 283                         return -ENODEV;
 284                 rdma_copy_src_l2_addr(dev_addr, dev);
 285                 dev_put(dev);
 286                 return 0;
 287         }
 288
 289         rcu_read_lock();
 290         dev = rdma_find_ndev_for_src_ip_rcu(dev_addr->net, addr);
 291         if (!IS_ERR(dev))
 292                 rdma_copy_src_l2_addr(dev_addr, dev);
 293         rcu_read_unlock();
 294         return PTR_ERR_OR_ZERO(dev);
 295 }
 296 EXPORT_SYMBOL(rdma_translate_ip);
 297
 298 static void set_timeout(struct addr_req *req, unsigned long time)
 299 {
 300         unsigned long delay;
 301
 302         delay = time - jiffies;
 303         if ((long)delay < 0)
 304                 delay = 0;
 305
 306         mod_delayed_work(addr_wq, &req->work, delay);
 307 }
 308
 309 static void queue_req(struct addr_req *req)
 310 {
 311         spin_lock_bh(&lock);
 312         list_add_tail(&req->list, &req_list);
 313         set_timeout(req, req->timeout);
 314         spin_unlock_bh(&lock);
 315 }
 316
 317 static int ib_nl_fetch_ha(struct rdma_dev_addr *dev_addr,
 318                           const void *daddr, u32 seq, u16 family)
 319 {
 320         if (!rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))
 321                 return -EADDRNOTAVAIL;
 322
 323         return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
 324 }
 325
 326 static int dst_fetch_ha(const struct dst_entry *dst,
 327                         struct rdma_dev_addr *dev_addr,
 328                         const void *daddr)
 329 {
 330         struct neighbour *n;
 331         int ret = 0;
 332
 333         n = dst_neigh_lookup(dst, daddr);
 334         if (!n)
 335                 return -ENODATA;
 336
 337         if (!(n->nud_state & NUD_VALID)) {
 338                 neigh_event_send(n, NULL);
 339                 ret = -ENODATA;
 340         } else {
 341                 neigh_ha_snapshot(dev_addr->dst_dev_addr, n, dst->dev);
 342         }
 343
 344         neigh_release(n);
 345
 346         return ret;
 347 }
 348
 349 static bool has_gateway(const struct dst_entry *dst, sa_family_t family)
 350 {
 351         if (family == AF_INET)
 352                 return dst_rtable(dst)->rt_uses_gateway;
 353
 354         return dst_rt6_info(dst)->rt6i_flags & RTF_GATEWAY;
 355 }
 356
 357 static int fetch_ha(const struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
 358                     const struct sockaddr *dst_in, u32 seq)
 359 {
 360         const struct sockaddr_in *dst_in4 =
 361                 (const struct sockaddr_in *)dst_in;
 362         const struct sockaddr_in6 *dst_in6 =
 363                 (const struct sockaddr_in6 *)dst_in;
 364         const void *daddr = (dst_in->sa_family == AF_INET) ?
 365                 (const void *)&dst_in4->sin_addr.s_addr :
 366                 (const void *)&dst_in6->sin6_addr;
 367         sa_family_t family = dst_in->sa_family;
 368
 369         might_sleep();
 370
 371         /* If we have a gateway in IB mode then it must be an IB network */
 372         if (has_gateway(dst, family) && dev_addr->network == RDMA_NETWORK_IB)
 373                 return ib_nl_fetch_ha(dev_addr, daddr, seq, family);
 374         else
 375                 return dst_fetch_ha(dst, dev_addr, daddr);
 376 }
 377
 378 static int addr4_resolve(struct sockaddr *src_sock,
 379                          const struct sockaddr *dst_sock,
 380                          struct rdma_dev_addr *addr,
 381                          struct rtable **prt)
 382 {
 383         struct sockaddr_in *src_in = (struct sockaddr_in *)src_sock;
 384         const struct sockaddr_in *dst_in =
 385                         (const struct sockaddr_in *)dst_sock;
 386
 387         __be32 src_ip = src_in->sin_addr.s_addr;
 388         __be32 dst_ip = dst_in->sin_addr.s_addr;
 389         struct rtable *rt;
 390         struct flowi4 fl4;
 391         int ret;
 392
 393         memset(&fl4, 0, sizeof(fl4));
 394         fl4.daddr = dst_ip;
 395         fl4.saddr = src_ip;
 396         fl4.flowi4_oif = addr->bound_dev_if;
 397         rt = ip_route_output_key(addr->net, &fl4);
 398         ret = PTR_ERR_OR_ZERO(rt);
 399         if (ret)
 400                 return ret;
 401
 402         src_in->sin_addr.s_addr = fl4.saddr;
 403
 404         addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
 405
 406         *prt = rt;
 407         return 0;
 408 }
 409
 410 #if IS_ENABLED(CONFIG_IPV6)
 411 static int addr6_resolve(struct sockaddr *src_sock,
 412                          const struct sockaddr *dst_sock,
 413                          struct rdma_dev_addr *addr,
 414                          struct dst_entry **pdst)
 415 {
 416         struct sockaddr_in6 *src_in = (struct sockaddr_in6 *)src_sock;
 417         const struct sockaddr_in6 *dst_in =
 418                                 (const struct sockaddr_in6 *)dst_sock;
 419         struct flowi6 fl6;
 420         struct dst_entry *dst;
 421
 422         memset(&fl6, 0, sizeof fl6);
 423         fl6.daddr = dst_in->sin6_addr;
 424         fl6.saddr = src_in->sin6_addr;
 425         fl6.flowi6_oif = addr->bound_dev_if;
 426
 427         dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);
 428         if (IS_ERR(dst))
 429                 return PTR_ERR(dst);
 430
 431         if (ipv6_addr_any(&src_in->sin6_addr))
 432                 src_in->sin6_addr = fl6.saddr;
 433
 434         addr->hoplimit = ip6_dst_hoplimit(dst);
 435
 436         *pdst = dst;
 437         return 0;
 438 }
 439 #else
 440 static int addr6_resolve(struct sockaddr *src_sock,
 441                          const struct sockaddr *dst_sock,
 442                          struct rdma_dev_addr *addr,
 443                          struct dst_entry **pdst)
 444 {
 445         return -EADDRNOTAVAIL;
 446 }
 447 #endif
 448
 449 static int addr_resolve_neigh(const struct dst_entry *dst,
 450                               const struct sockaddr *dst_in,
 451                               struct rdma_dev_addr *addr,
 452                               unsigned int ndev_flags,
 453                               u32 seq)
 454 {
 455         int ret = 0;
 456
 457         if (ndev_flags & IFF_LOOPBACK) {
 458                 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
 459         } else {
 460                 if (!(ndev_flags & IFF_NOARP)) {
 461                         /* If the device doesn't do ARP internally */
 462                         ret = fetch_ha(dst, addr, dst_in, seq);
 463                 }
 464         }
 465         return ret;
 466 }
 467
 468 static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
 469                             const struct sockaddr *dst_in,
 470                             const struct dst_entry *dst,
 471                             const struct net_device *ndev)
 472 {
 473         int ret = 0;
 474
 475         if (dst->dev->flags & IFF_LOOPBACK)
 476                 ret = rdma_translate_ip(dst_in, dev_addr);
 477         else
 478                 rdma_copy_src_l2_addr(dev_addr, dst->dev);
 479
 480         /*
 481          * If there's a gateway and type of device not ARPHRD_INFINIBAND,
 482          * we're definitely in RoCE v2 (as RoCE v1 isn't routable) set the
 483          * network type accordingly.
 484          */
 485         if (has_gateway(dst, dst_in->sa_family) &&
 486             ndev->type != ARPHRD_INFINIBAND)
 487                 dev_addr->network = dst_in->sa_family == AF_INET ?
 488                                                 RDMA_NETWORK_IPV4 :
 489                                                 RDMA_NETWORK_IPV6;
 490         else
 491                 dev_addr->network = RDMA_NETWORK_IB;
 492
 493         return ret;
 494 }
 495
 496 static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
 497                                  unsigned int *ndev_flags,
 498                                  const struct sockaddr *dst_in,
 499                                  const struct dst_entry *dst)
 500 {
 501         struct net_device *ndev = READ_ONCE(dst->dev);
 502
 503         *ndev_flags = ndev->flags;
 504         /* A physical device must be the RDMA device to use */
 505         if (ndev->flags & IFF_LOOPBACK) {
 506                 /*
 507                  * RDMA (IB/RoCE, iWarp) doesn't run on lo interface or
 508                  * loopback IP address. So if route is resolved to loopback
 509                  * interface, translate that to a real ndev based on non
 510                  * loopback IP address.
 511                  */
 512                 ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);
 513                 if (IS_ERR(ndev))
 514                         return -ENODEV;
 515         }
 516
 517         return copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
 518 }
 519
 520 static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)
 521 {
 522         struct net_device *ndev;
 523
 524         ndev = rdma_read_gid_attr_ndev_rcu(addr->sgid_attr);
 525         if (IS_ERR(ndev))
 526                 return PTR_ERR(ndev);
 527
 528         /*
 529          * Since we are holding the rcu, reading net and ifindex
 530          * are safe without any additional reference; because
 531          * change_net_namespace() in net/core/dev.c does rcu sync
 532          * after it changes the state to IFF_DOWN and before
 533          * updating netdev fields {net, ifindex}.
 534          */
 535         addr->net = dev_net(ndev);
 536         addr->bound_dev_if = ndev->ifindex;
 537         return 0;
 538 }
 539
 540 static void rdma_addr_set_net_defaults(struct rdma_dev_addr *addr)
 541 {
 542         addr->net = &init_net;
 543         addr->bound_dev_if = 0;
 544 }
 545
 546 static int addr_resolve(struct sockaddr *src_in,
 547                         const struct sockaddr *dst_in,
 548                         struct rdma_dev_addr *addr,
 549                         bool resolve_neigh,
 550                         bool resolve_by_gid_attr,
 551                         u32 seq)
 552 {
 553         struct dst_entry *dst = NULL;
 554         unsigned int ndev_flags = 0;
 555         struct rtable *rt = NULL;
 556         int ret;
 557
 558         if (!addr->net) {
 559                 pr_warn_ratelimited("%s: missing namespace\n", __func__);
 560                 return -EINVAL;
 561         }
 562
 563         rcu_read_lock();
 564         if (resolve_by_gid_attr) {
 565                 if (!addr->sgid_attr) {
 566                         rcu_read_unlock();
 567                         pr_warn_ratelimited("%s: missing gid_attr\n", __func__);
 568                         return -EINVAL;
 569                 }
 570                 /*
 571                  * If the request is for a specific gid attribute of the
 572                  * rdma_dev_addr, derive net from the netdevice of the
 573                  * GID attribute.
 574                  */
 575                 ret = set_addr_netns_by_gid_rcu(addr);
 576                 if (ret) {
 577                         rcu_read_unlock();
 578                         return ret;
 579                 }
 580         }
 581         if (src_in->sa_family == AF_INET) {
 582                 ret = addr4_resolve(src_in, dst_in, addr, &rt);
 583                 dst = &rt->dst;
 584         } else {
 585                 ret = addr6_resolve(src_in, dst_in, addr, &dst);
 586         }
 587         if (ret) {
 588                 rcu_read_unlock();
 589                 goto done;
 590         }
 591         ret = rdma_set_src_addr_rcu(addr, &ndev_flags, dst_in, dst);
 592         rcu_read_unlock();
 593
 594         /*
 595          * Resolve neighbor destination address if requested and
 596          * only if src addr translation didn't fail.
 597          */
 598         if (!ret && resolve_neigh)
 599                 ret = addr_resolve_neigh(dst, dst_in, addr, ndev_flags, seq);
 600
 601         if (src_in->sa_family == AF_INET)
 602                 ip_rt_put(rt);
 603         else
 604                 dst_release(dst);
 605 done:
 606         /*
 607          * Clear the addr net to go back to its original state, only if it was
 608          * derived from GID attribute in this context.
 609          */
 610         if (resolve_by_gid_attr)
 611                 rdma_addr_set_net_defaults(addr);
 612         return ret;
 613 }
 614
 615 static void process_one_req(struct work_struct *_work)
 616 {
 617         struct addr_req *req;
 618         struct sockaddr *src_in, *dst_in;
 619
 620         req = container_of(_work, struct addr_req, work.work);
 621
 622         if (req->status == -ENODATA) {
 623                 src_in = (struct sockaddr *)&req->src_addr;
 624                 dst_in = (struct sockaddr *)&req->dst_addr;
 625                 req->status = addr_resolve(src_in, dst_in, req->addr,
 626                                            true, req->resolve_by_gid_attr,
 627                                            req->seq);
 628                 if (req->status && time_after_eq(jiffies, req->timeout)) {
 629                         req->status = -ETIMEDOUT;
 630                 } else if (req->status == -ENODATA) {
 631                         /* requeue the work for retrying again */
 632                         spin_lock_bh(&lock);
 633                         if (!list_empty(&req->list))
 634                                 set_timeout(req, req->timeout);
 635                         spin_unlock_bh(&lock);
 636                         return;
 637                 }
 638         }
 639
 640         req->callback(req->status, (struct sockaddr *)&req->src_addr,
 641                 req->addr, req->context);
 642         req->callback = NULL;
 643
 644         spin_lock_bh(&lock);
 645         /*
 646          * Although the work will normally have been canceled by the workqueue,
 647          * it can still be requeued as long as it is on the req_list.
 648          */
 649         cancel_delayed_work(&req->work);
 650         if (!list_empty(&req->list)) {
 651                 list_del_init(&req->list);
 652                 kfree(req);
 653         }
 654         spin_unlock_bh(&lock);
 655 }
 656
 657 int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
 658                     struct rdma_dev_addr *addr, unsigned long timeout_ms,
 659                     void (*callback)(int status, struct sockaddr *src_addr,
 660                                      struct rdma_dev_addr *addr, void *context),
 661                     bool resolve_by_gid_attr, void *context)
 662 {
 663         struct sockaddr *src_in, *dst_in;
 664         struct addr_req *req;
 665         int ret = 0;
 666
 667         req = kzalloc(sizeof *req, GFP_KERNEL);
 668         if (!req)
 669                 return -ENOMEM;
 670
 671         src_in = (struct sockaddr *) &req->src_addr;
 672         dst_in = (struct sockaddr *) &req->dst_addr;
 673
 674         if (src_addr) {
 675                 if (src_addr->sa_family != dst_addr->sa_family) {
 676                         ret = -EINVAL;
 677                         goto err;
 678                 }
 679
 680                 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
 681         } else {
 682                 src_in->sa_family = dst_addr->sa_family;
 683         }
 684
 685         memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
 686         req->addr = addr;
 687         req->callback = callback;
 688         req->context = context;
 689         req->resolve_by_gid_attr = resolve_by_gid_attr;
 690         INIT_DELAYED_WORK(&req->work, process_one_req);
 691         req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
 692
 693         req->status = addr_resolve(src_in, dst_in, addr, true,
 694                                    req->resolve_by_gid_attr, req->seq);
 695         switch (req->status) {
 696         case 0:
 697                 req->timeout = jiffies;
 698                 queue_req(req);
 699                 break;
 700         case -ENODATA:
 701                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
 702                 queue_req(req);
 703                 break;
 704         default:
 705                 ret = req->status;
 706                 goto err;
 707         }
 708         return ret;
 709 err:
 710         kfree(req);
 711         return ret;
 712 }
 713 EXPORT_SYMBOL(rdma_resolve_ip);
 714
 715 int roce_resolve_route_from_path(struct sa_path_rec *rec,
 716                                  const struct ib_gid_attr *attr)
 717 {
 718         union {
 719                 struct sockaddr     _sockaddr;
 720                 struct sockaddr_in  _sockaddr_in;
 721                 struct sockaddr_in6 _sockaddr_in6;
 722         } sgid, dgid;
 723         struct rdma_dev_addr dev_addr = {};
 724         int ret;
 725
 726         might_sleep();
 727
 728         if (rec->roce.route_resolved)
 729                 return 0;
 730
 731         rdma_gid2ip((struct sockaddr *)&sgid, &rec->sgid);
 732         rdma_gid2ip((struct sockaddr *)&dgid, &rec->dgid);
 733
 734         if (sgid._sockaddr.sa_family != dgid._sockaddr.sa_family)
 735                 return -EINVAL;
 736
 737         if (!attr || !attr->ndev)
 738                 return -EINVAL;
 739
 740         dev_addr.net = &init_net;
 741         dev_addr.sgid_attr = attr;
 742
 743         ret = addr_resolve((struct sockaddr *)&sgid, (struct sockaddr *)&dgid,
 744                            &dev_addr, false, true, 0);
 745         if (ret)
 746                 return ret;
 747
 748         if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
 749              dev_addr.network == RDMA_NETWORK_IPV6) &&
 750             rec->rec_type != SA_PATH_REC_TYPE_ROCE_V2)
 751                 return -EINVAL;
 752
 753         rec->roce.route_resolved = true;
 754         return 0;
 755 }
 756
 757 /**
 758  * rdma_addr_cancel - Cancel resolve ip request
 759  * @addr:       Pointer to address structure given previously
 760  *              during rdma_resolve_ip().
 761  * rdma_addr_cancel() is synchronous function which cancels any pending
 762  * request if there is any.
 763  */
 764 void rdma_addr_cancel(struct rdma_dev_addr *addr)
 765 {
 766         struct addr_req *req, *temp_req;
 767         struct addr_req *found = NULL;
 768
 769         spin_lock_bh(&lock);
 770         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 771                 if (req->addr == addr) {
 772                         /*
 773                          * Removing from the list means we take ownership of
 774                          * the req
 775                          */
 776                         list_del_init(&req->list);
 777                         found = req;
 778                         break;
 779                 }
 780         }
 781         spin_unlock_bh(&lock);
 782
 783         if (!found)
 784                 return;
 785
 786         /*
 787          * sync canceling the work after removing it from the req_list
 788          * guarentees no work is running and none will be started.
 789          */
 790         cancel_delayed_work_sync(&found->work);
 791         kfree(found);
 792 }
 793 EXPORT_SYMBOL(rdma_addr_cancel);
 794
 795 struct resolve_cb_context {
 796         struct completion comp;
 797         int status;
 798 };
 799
 800 static void resolve_cb(int status, struct sockaddr *src_addr,
 801              struct rdma_dev_addr *addr, void *context)
 802 {
 803         ((struct resolve_cb_context *)context)->status = status;
 804         complete(&((struct resolve_cb_context *)context)->comp);
 805 }
 806
 807 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 808                                  const union ib_gid *dgid,
 809                                  u8 *dmac, const struct ib_gid_attr *sgid_attr,
 810                                  int *hoplimit)
 811 {
 812         struct rdma_dev_addr dev_addr;
 813         struct resolve_cb_context ctx;
 814         union {
 815                 struct sockaddr_in  _sockaddr_in;
 816                 struct sockaddr_in6 _sockaddr_in6;
 817         } sgid_addr, dgid_addr;
 818         int ret;
 819
 820         rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
 821         rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);
 822
 823         memset(&dev_addr, 0, sizeof(dev_addr));
 824         dev_addr.net = &init_net;
 825         dev_addr.sgid_attr = sgid_attr;
 826
 827         init_completion(&ctx.comp);
 828         ret = rdma_resolve_ip((struct sockaddr *)&sgid_addr,
 829                               (struct sockaddr *)&dgid_addr, &dev_addr, 1000,
 830                               resolve_cb, true, &ctx);
 831         if (ret)
 832                 return ret;
 833
 834         wait_for_completion(&ctx.comp);
 835
 836         ret = ctx.status;
 837         if (ret)
 838                 return ret;
 839
 840         memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
 841         *hoplimit = dev_addr.hoplimit;
 842         return 0;
 843 }
 844
 845 static int netevent_callback(struct notifier_block *self, unsigned long event,
 846         void *ctx)
 847 {
 848         struct addr_req *req;
 849
 850         if (event == NETEVENT_NEIGH_UPDATE) {
 851                 struct neighbour *neigh = ctx;
 852
 853                 if (neigh->nud_state & NUD_VALID) {
 854                         spin_lock_bh(&lock);
 855                         list_for_each_entry(req, &req_list, list)
 856                                 set_timeout(req, jiffies);
 857                         spin_unlock_bh(&lock);
 858                 }
 859         }
 860         return 0;
 861 }
 862
 863 static struct notifier_block nb = {
 864         .notifier_call = netevent_callback
 865 };
 866
 867 int addr_init(void)
 868 {
 869         addr_wq = alloc_ordered_workqueue("ib_addr", 0);
 870         if (!addr_wq)
 871                 return -ENOMEM;
 872
 873         register_netevent_notifier(&nb);
 874
 875         return 0;
 876 }
 877
 878 void addr_cleanup(void)
 879 {
 880         unregister_netevent_notifier(&nb);
 881         destroy_workqueue(addr_wq);
 882         WARN_ON(!list_empty(&req_list));
 883 }