drivers/infiniband/core/iwpm_util.c

   1 /*
   2  * Copyright (c) 2014 Chelsio, Inc. All rights reserved.
   3  * Copyright (c) 2014 Intel Corporation. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include "iwpm_util.h"
  35
  36 #define IWPM_MAPINFO_HASH_SIZE  512
  37 #define IWPM_MAPINFO_HASH_MASK  (IWPM_MAPINFO_HASH_SIZE - 1)
  38 #define IWPM_REMINFO_HASH_SIZE  64
  39 #define IWPM_REMINFO_HASH_MASK  (IWPM_REMINFO_HASH_SIZE - 1)
  40 #define IWPM_MSG_SIZE           512
  41
  42 static LIST_HEAD(iwpm_nlmsg_req_list);
  43 static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
  44
  45 static struct hlist_head *iwpm_hash_bucket;
  46 static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
  47
  48 static struct hlist_head *iwpm_reminfo_bucket;
  49 static DEFINE_SPINLOCK(iwpm_reminfo_lock);
  50
  51 static struct iwpm_admin_data iwpm_admin;
  52
  53 /**
  54  * iwpm_init - Allocate resources for the iwarp port mapper
  55  * @nl_client: The index of the netlink client
  56  *
  57  * Should be called when network interface goes up.
  58  */
  59 int iwpm_init(u8 nl_client)
  60 {
  61         iwpm_hash_bucket = kcalloc(IWPM_MAPINFO_HASH_SIZE,
  62                                    sizeof(struct hlist_head), GFP_KERNEL);
  63         if (!iwpm_hash_bucket)
  64                 return -ENOMEM;
  65
  66         iwpm_reminfo_bucket = kcalloc(IWPM_REMINFO_HASH_SIZE,
  67                                       sizeof(struct hlist_head), GFP_KERNEL);
  68         if (!iwpm_reminfo_bucket) {
  69                 kfree(iwpm_hash_bucket);
  70                 return -ENOMEM;
  71         }
  72
  73         iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
  74         pr_debug("%s: Mapinfo and reminfo tables are created\n", __func__);
  75         return 0;
  76 }
  77
  78 static void free_hash_bucket(void);
  79 static void free_reminfo_bucket(void);
  80
  81 /**
  82  * iwpm_exit - Deallocate resources for the iwarp port mapper
  83  * @nl_client: The index of the netlink client
  84  *
  85  * Should be called when network interface goes down.
  86  */
  87 int iwpm_exit(u8 nl_client)
  88 {
  89         free_hash_bucket();
  90         free_reminfo_bucket();
  91         pr_debug("%s: Resources are destroyed\n", __func__);
  92         iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
  93         return 0;
  94 }
  95
  96 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
  97                                                struct sockaddr_storage *);
  98
  99 /**
 100  * iwpm_create_mapinfo - Store local and mapped IPv4/IPv6 address
 101  *                       info in a hash table
 102  * @local_sockaddr: Local ip/tcp address
 103  * @mapped_sockaddr: Mapped local ip/tcp address
 104  * @nl_client: The index of the netlink client
 105  * @map_flags: IWPM mapping flags
 106  */
 107 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
 108                         struct sockaddr_storage *mapped_sockaddr,
 109                         u8 nl_client, u32 map_flags)
 110 {
 111         struct hlist_head *hash_bucket_head = NULL;
 112         struct iwpm_mapping_info *map_info;
 113         unsigned long flags;
 114         int ret = -EINVAL;
 115
 116         map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
 117         if (!map_info)
 118                 return -ENOMEM;
 119
 120         memcpy(&map_info->local_sockaddr, local_sockaddr,
 121                sizeof(struct sockaddr_storage));
 122         memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
 123                sizeof(struct sockaddr_storage));
 124         map_info->nl_client = nl_client;
 125         map_info->map_flags = map_flags;
 126
 127         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 128         if (iwpm_hash_bucket) {
 129                 hash_bucket_head = get_mapinfo_hash_bucket(
 130                                         &map_info->local_sockaddr,
 131                                         &map_info->mapped_sockaddr);
 132                 if (hash_bucket_head) {
 133                         hlist_add_head(&map_info->hlist_node, hash_bucket_head);
 134                         ret = 0;
 135                 }
 136         }
 137         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 138
 139         if (!hash_bucket_head)
 140                 kfree(map_info);
 141         return ret;
 142 }
 143
 144 /**
 145  * iwpm_remove_mapinfo - Remove local and mapped IPv4/IPv6 address
 146  *                       info from the hash table
 147  * @local_sockaddr: Local ip/tcp address
 148  * @mapped_local_addr: Mapped local ip/tcp address
 149  *
 150  * Returns err code if mapping info is not found in the hash table,
 151  * otherwise returns 0
 152  */
 153 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
 154                         struct sockaddr_storage *mapped_local_addr)
 155 {
 156         struct hlist_node *tmp_hlist_node;
 157         struct hlist_head *hash_bucket_head;
 158         struct iwpm_mapping_info *map_info = NULL;
 159         unsigned long flags;
 160         int ret = -EINVAL;
 161
 162         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 163         if (iwpm_hash_bucket) {
 164                 hash_bucket_head = get_mapinfo_hash_bucket(
 165                                         local_sockaddr,
 166                                         mapped_local_addr);
 167                 if (!hash_bucket_head)
 168                         goto remove_mapinfo_exit;
 169
 170                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 171                                         hash_bucket_head, hlist_node) {
 172
 173                         if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
 174                                                 mapped_local_addr)) {
 175
 176                                 hlist_del_init(&map_info->hlist_node);
 177                                 kfree(map_info);
 178                                 ret = 0;
 179                                 break;
 180                         }
 181                 }
 182         }
 183 remove_mapinfo_exit:
 184         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 185         return ret;
 186 }
 187
 188 static void free_hash_bucket(void)
 189 {
 190         struct hlist_node *tmp_hlist_node;
 191         struct iwpm_mapping_info *map_info;
 192         unsigned long flags;
 193         int i;
 194
 195         /* remove all the mapinfo data from the list */
 196         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 197         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 198                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 199                         &iwpm_hash_bucket[i], hlist_node) {
 200
 201                                 hlist_del_init(&map_info->hlist_node);
 202                                 kfree(map_info);
 203                         }
 204         }
 205         /* free the hash list */
 206         kfree(iwpm_hash_bucket);
 207         iwpm_hash_bucket = NULL;
 208         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 209 }
 210
 211 static void free_reminfo_bucket(void)
 212 {
 213         struct hlist_node *tmp_hlist_node;
 214         struct iwpm_remote_info *rem_info;
 215         unsigned long flags;
 216         int i;
 217
 218         /* remove all the remote info from the list */
 219         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 220         for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
 221                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 222                         &iwpm_reminfo_bucket[i], hlist_node) {
 223
 224                                 hlist_del_init(&rem_info->hlist_node);
 225                                 kfree(rem_info);
 226                         }
 227         }
 228         /* free the hash list */
 229         kfree(iwpm_reminfo_bucket);
 230         iwpm_reminfo_bucket = NULL;
 231         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 232 }
 233
 234 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
 235                                                 struct sockaddr_storage *);
 236
 237 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
 238 {
 239         struct hlist_head *hash_bucket_head;
 240         unsigned long flags;
 241
 242         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 243         if (iwpm_reminfo_bucket) {
 244                 hash_bucket_head = get_reminfo_hash_bucket(
 245                                         &rem_info->mapped_loc_sockaddr,
 246                                         &rem_info->mapped_rem_sockaddr);
 247                 if (hash_bucket_head)
 248                         hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
 249         }
 250         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 251 }
 252
 253 /**
 254  * iwpm_get_remote_info - Get the remote connecting peer address info
 255  *
 256  * @mapped_loc_addr: Mapped local address of the listening peer
 257  * @mapped_rem_addr: Mapped remote address of the connecting peer
 258  * @remote_addr: To store the remote address of the connecting peer
 259  * @nl_client: The index of the netlink client
 260  *
 261  * The remote address info is retrieved and provided to the client in
 262  * the remote_addr. After that it is removed from the hash table
 263  */
 264 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
 265                          struct sockaddr_storage *mapped_rem_addr,
 266                          struct sockaddr_storage *remote_addr,
 267                          u8 nl_client)
 268 {
 269         struct hlist_node *tmp_hlist_node;
 270         struct hlist_head *hash_bucket_head;
 271         struct iwpm_remote_info *rem_info = NULL;
 272         unsigned long flags;
 273         int ret = -EINVAL;
 274
 275         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 276         if (iwpm_reminfo_bucket) {
 277                 hash_bucket_head = get_reminfo_hash_bucket(
 278                                         mapped_loc_addr,
 279                                         mapped_rem_addr);
 280                 if (!hash_bucket_head)
 281                         goto get_remote_info_exit;
 282                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 283                                         hash_bucket_head, hlist_node) {
 284
 285                         if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
 286                                 mapped_loc_addr) &&
 287                                 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
 288                                 mapped_rem_addr)) {
 289
 290                                 memcpy(remote_addr, &rem_info->remote_sockaddr,
 291                                         sizeof(struct sockaddr_storage));
 292                                 iwpm_print_sockaddr(remote_addr,
 293                                                 "get_remote_info: Remote sockaddr:");
 294
 295                                 hlist_del_init(&rem_info->hlist_node);
 296                                 kfree(rem_info);
 297                                 ret = 0;
 298                                 break;
 299                         }
 300                 }
 301         }
 302 get_remote_info_exit:
 303         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 304         return ret;
 305 }
 306
 307 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
 308                                         u8 nl_client, gfp_t gfp)
 309 {
 310         struct iwpm_nlmsg_request *nlmsg_request;
 311         unsigned long flags;
 312
 313         nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
 314         if (!nlmsg_request)
 315                 return NULL;
 316
 317         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 318         list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
 319         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 320
 321         kref_init(&nlmsg_request->kref);
 322         kref_get(&nlmsg_request->kref);
 323         nlmsg_request->nlmsg_seq = nlmsg_seq;
 324         nlmsg_request->nl_client = nl_client;
 325         nlmsg_request->request_done = 0;
 326         nlmsg_request->err_code = 0;
 327         sema_init(&nlmsg_request->sem, 1);
 328         down(&nlmsg_request->sem);
 329         return nlmsg_request;
 330 }
 331
 332 void iwpm_free_nlmsg_request(struct kref *kref)
 333 {
 334         struct iwpm_nlmsg_request *nlmsg_request;
 335         unsigned long flags;
 336
 337         nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
 338
 339         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 340         list_del_init(&nlmsg_request->inprocess_list);
 341         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 342
 343         if (!nlmsg_request->request_done)
 344                 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
 345                         __func__, nlmsg_request->nlmsg_seq);
 346         kfree(nlmsg_request);
 347 }
 348
 349 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
 350 {
 351         struct iwpm_nlmsg_request *nlmsg_request;
 352         struct iwpm_nlmsg_request *found_request = NULL;
 353         unsigned long flags;
 354
 355         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 356         list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
 357                             inprocess_list) {
 358                 if (nlmsg_request->nlmsg_seq == echo_seq) {
 359                         found_request = nlmsg_request;
 360                         kref_get(&nlmsg_request->kref);
 361                         break;
 362                 }
 363         }
 364         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 365         return found_request;
 366 }
 367
 368 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
 369 {
 370         int ret;
 371
 372         ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
 373         if (ret) {
 374                 ret = -EINVAL;
 375                 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
 376                         __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
 377         } else {
 378                 ret = nlmsg_request->err_code;
 379         }
 380         kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
 381         return ret;
 382 }
 383
 384 int iwpm_get_nlmsg_seq(void)
 385 {
 386         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
 387 }
 388
 389 /* valid client */
 390 u32 iwpm_get_registration(u8 nl_client)
 391 {
 392         return iwpm_admin.reg_list[nl_client];
 393 }
 394
 395 /* valid client */
 396 void iwpm_set_registration(u8 nl_client, u32 reg)
 397 {
 398         iwpm_admin.reg_list[nl_client] = reg;
 399 }
 400
 401 /* valid client */
 402 u32 iwpm_check_registration(u8 nl_client, u32 reg)
 403 {
 404         return (iwpm_get_registration(nl_client) & reg);
 405 }
 406
 407 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 408                                 struct sockaddr_storage *b_sockaddr)
 409 {
 410         if (a_sockaddr->ss_family != b_sockaddr->ss_family)
 411                 return 1;
 412         if (a_sockaddr->ss_family == AF_INET) {
 413                 struct sockaddr_in *a4_sockaddr =
 414                         (struct sockaddr_in *)a_sockaddr;
 415                 struct sockaddr_in *b4_sockaddr =
 416                         (struct sockaddr_in *)b_sockaddr;
 417                 if (!memcmp(&a4_sockaddr->sin_addr,
 418                         &b4_sockaddr->sin_addr, sizeof(struct in_addr))
 419                         && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
 420                                 return 0;
 421
 422         } else if (a_sockaddr->ss_family == AF_INET6) {
 423                 struct sockaddr_in6 *a6_sockaddr =
 424                         (struct sockaddr_in6 *)a_sockaddr;
 425                 struct sockaddr_in6 *b6_sockaddr =
 426                         (struct sockaddr_in6 *)b_sockaddr;
 427                 if (!memcmp(&a6_sockaddr->sin6_addr,
 428                         &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
 429                         && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
 430                                 return 0;
 431
 432         } else {
 433                 pr_err("%s: Invalid sockaddr family\n", __func__);
 434         }
 435         return 1;
 436 }
 437
 438 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 439                                                 int nl_client)
 440 {
 441         struct sk_buff *skb = NULL;
 442
 443         skb = dev_alloc_skb(IWPM_MSG_SIZE);
 444         if (!skb)
 445                 goto create_nlmsg_exit;
 446
 447         if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
 448                            NLM_F_REQUEST))) {
 449                 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
 450                 dev_kfree_skb(skb);
 451                 skb = NULL;
 452         }
 453 create_nlmsg_exit:
 454         return skb;
 455 }
 456
 457 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 458                                    const struct nla_policy *nlmsg_policy,
 459                                    struct nlattr *nltb[], const char *msg_type)
 460 {
 461         int nlh_len = 0;
 462         int ret;
 463         const char *err_str = "";
 464
 465         ret = nlmsg_validate_deprecated(cb->nlh, nlh_len, policy_max - 1,
 466                                         nlmsg_policy, NULL);
 467         if (ret) {
 468                 err_str = "Invalid attribute";
 469                 goto parse_nlmsg_error;
 470         }
 471         ret = nlmsg_parse_deprecated(cb->nlh, nlh_len, nltb, policy_max - 1,
 472                                      nlmsg_policy, NULL);
 473         if (ret) {
 474                 err_str = "Unable to parse the nlmsg";
 475                 goto parse_nlmsg_error;
 476         }
 477         ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
 478         if (ret) {
 479                 err_str = "Invalid NULL attribute";
 480                 goto parse_nlmsg_error;
 481         }
 482         return 0;
 483 parse_nlmsg_error:
 484         pr_warn("%s: %s (msg type %s ret = %d)\n",
 485                         __func__, err_str, msg_type, ret);
 486         return ret;
 487 }
 488
 489 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
 490 {
 491         struct sockaddr_in6 *sockaddr_v6;
 492         struct sockaddr_in *sockaddr_v4;
 493
 494         switch (sockaddr->ss_family) {
 495         case AF_INET:
 496                 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
 497                 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
 498                         msg, &sockaddr_v4->sin_addr,
 499                         ntohs(sockaddr_v4->sin_port),
 500                         ntohs(sockaddr_v4->sin_port));
 501                 break;
 502         case AF_INET6:
 503                 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
 504                 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
 505                         msg, &sockaddr_v6->sin6_addr,
 506                         ntohs(sockaddr_v6->sin6_port),
 507                         ntohs(sockaddr_v6->sin6_port));
 508                 break;
 509         default:
 510                 break;
 511         }
 512 }
 513
 514 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
 515 {
 516         u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
 517         u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
 518         return hash;
 519 }
 520
 521 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
 522 {
 523         u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
 524         u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
 525         return hash;
 526 }
 527
 528 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
 529                                 struct sockaddr_storage *b_sockaddr, u32 *hash)
 530 {
 531         u32 a_hash, b_hash;
 532
 533         if (a_sockaddr->ss_family == AF_INET) {
 534                 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
 535                 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
 536
 537         } else if (a_sockaddr->ss_family == AF_INET6) {
 538                 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
 539                 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
 540         } else {
 541                 pr_err("%s: Invalid sockaddr family\n", __func__);
 542                 return -EINVAL;
 543         }
 544
 545         if (a_hash == b_hash) /* if port mapper isn't available */
 546                 *hash = a_hash;
 547         else
 548                 *hash = jhash_2words(a_hash, b_hash, 0);
 549         return 0;
 550 }
 551
 552 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
 553                                 *local_sockaddr, struct sockaddr_storage
 554                                 *mapped_sockaddr)
 555 {
 556         u32 hash;
 557         int ret;
 558
 559         ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
 560         if (ret)
 561                 return NULL;
 562         return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
 563 }
 564
 565 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
 566                                 *mapped_loc_sockaddr, struct sockaddr_storage
 567                                 *mapped_rem_sockaddr)
 568 {
 569         u32 hash;
 570         int ret;
 571
 572         ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
 573         if (ret)
 574                 return NULL;
 575         return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
 576 }
 577
 578 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
 579 {
 580         struct sk_buff *skb = NULL;
 581         struct nlmsghdr *nlh;
 582         u32 msg_seq;
 583         const char *err_str = "";
 584         int ret = -EINVAL;
 585
 586         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
 587         if (!skb) {
 588                 err_str = "Unable to create a nlmsg";
 589                 goto mapinfo_num_error;
 590         }
 591         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 592         msg_seq = 0;
 593         err_str = "Unable to put attribute of mapinfo number nlmsg";
 594         ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
 595         if (ret)
 596                 goto mapinfo_num_error;
 597         ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 598                                 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
 599         if (ret)
 600                 goto mapinfo_num_error;
 601
 602         nlmsg_end(skb, nlh);
 603
 604         ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
 605         if (ret) {
 606                 skb = NULL;
 607                 err_str = "Unable to send a nlmsg";
 608                 goto mapinfo_num_error;
 609         }
 610         pr_debug("%s: Sent mapping number = %u\n", __func__, mapping_num);
 611         return 0;
 612 mapinfo_num_error:
 613         pr_info("%s: %s\n", __func__, err_str);
 614         dev_kfree_skb(skb);
 615         return ret;
 616 }
 617
 618 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
 619 {
 620         struct nlmsghdr *nlh = NULL;
 621         int ret = 0;
 622
 623         if (!skb)
 624                 return ret;
 625         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 626                            RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 627                 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
 628                 dev_kfree_skb(skb);
 629                 return -ENOMEM;
 630         }
 631         nlh->nlmsg_type = NLMSG_DONE;
 632         ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
 633         if (ret)
 634                 pr_warn("%s Unable to send a nlmsg\n", __func__);
 635         return ret;
 636 }
 637
 638 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
 639 {
 640         struct iwpm_mapping_info *map_info;
 641         struct sk_buff *skb = NULL;
 642         struct nlmsghdr *nlh;
 643         int skb_num = 0, mapping_num = 0;
 644         int i = 0, nlmsg_bytes = 0;
 645         unsigned long flags;
 646         const char *err_str = "";
 647         int ret;
 648
 649         skb = dev_alloc_skb(NLMSG_GOODSIZE);
 650         if (!skb) {
 651                 ret = -ENOMEM;
 652                 err_str = "Unable to allocate skb";
 653                 goto send_mapping_info_exit;
 654         }
 655         skb_num++;
 656         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 657         ret = -EINVAL;
 658         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 659                 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
 660                                      hlist_node) {
 661                         if (map_info->nl_client != nl_client)
 662                                 continue;
 663                         nlh = NULL;
 664                         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 665                                         RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 666                                 ret = -ENOMEM;
 667                                 err_str = "Unable to put the nlmsg header";
 668                                 goto send_mapping_info_unlock;
 669                         }
 670                         err_str = "Unable to put attribute of the nlmsg";
 671                         ret = ibnl_put_attr(skb, nlh,
 672                                         sizeof(struct sockaddr_storage),
 673                                         &map_info->local_sockaddr,
 674                                         IWPM_NLA_MAPINFO_LOCAL_ADDR);
 675                         if (ret)
 676                                 goto send_mapping_info_unlock;
 677
 678                         ret = ibnl_put_attr(skb, nlh,
 679                                         sizeof(struct sockaddr_storage),
 680                                         &map_info->mapped_sockaddr,
 681                                         IWPM_NLA_MAPINFO_MAPPED_ADDR);
 682                         if (ret)
 683                                 goto send_mapping_info_unlock;
 684
 685                         if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) {
 686                                 ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 687                                                 &map_info->map_flags,
 688                                                 IWPM_NLA_MAPINFO_FLAGS);
 689                                 if (ret)
 690                                         goto send_mapping_info_unlock;
 691                         }
 692
 693                         nlmsg_end(skb, nlh);
 694
 695                         iwpm_print_sockaddr(&map_info->local_sockaddr,
 696                                 "send_mapping_info: Local sockaddr:");
 697                         iwpm_print_sockaddr(&map_info->mapped_sockaddr,
 698                                 "send_mapping_info: Mapped local sockaddr:");
 699                         mapping_num++;
 700                         nlmsg_bytes += nlh->nlmsg_len;
 701
 702                         /* check if all mappings can fit in one skb */
 703                         if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
 704                                 /* and leave room for NLMSG_DONE */
 705                                 nlmsg_bytes = 0;
 706                                 skb_num++;
 707                                 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
 708                                                        flags);
 709                                 /* send the skb */
 710                                 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
 711                                 skb = NULL;
 712                                 if (ret) {
 713                                         err_str = "Unable to send map info";
 714                                         goto send_mapping_info_exit;
 715                                 }
 716                                 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
 717                                         ret = -ENOMEM;
 718                                         err_str = "Insufficient skbs for map info";
 719                                         goto send_mapping_info_exit;
 720                                 }
 721                                 skb = dev_alloc_skb(NLMSG_GOODSIZE);
 722                                 if (!skb) {
 723                                         ret = -ENOMEM;
 724                                         err_str = "Unable to allocate skb";
 725                                         goto send_mapping_info_exit;
 726                                 }
 727                                 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 728                         }
 729                 }
 730         }
 731 send_mapping_info_unlock:
 732         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 733 send_mapping_info_exit:
 734         if (ret) {
 735                 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
 736                 dev_kfree_skb(skb);
 737                 return ret;
 738         }
 739         send_nlmsg_done(skb, nl_client, iwpm_pid);
 740         return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
 741 }
 742
 743 int iwpm_mapinfo_available(void)
 744 {
 745         unsigned long flags;
 746         int full_bucket = 0, i = 0;
 747
 748         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 749         if (iwpm_hash_bucket) {
 750                 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 751                         if (!hlist_empty(&iwpm_hash_bucket[i])) {
 752                                 full_bucket = 1;
 753                                 break;
 754                         }
 755                 }
 756         }
 757         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 758         return full_bucket;
 759 }
 760
 761 int iwpm_send_hello(u8 nl_client, int iwpm_pid, u16 abi_version)
 762 {
 763         struct sk_buff *skb = NULL;
 764         struct nlmsghdr *nlh;
 765         const char *err_str;
 766         int ret = -EINVAL;
 767
 768         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_HELLO, &nlh, nl_client);
 769         if (!skb) {
 770                 err_str = "Unable to create a nlmsg";
 771                 goto hello_num_error;
 772         }
 773         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 774         err_str = "Unable to put attribute of abi_version into nlmsg";
 775         ret = ibnl_put_attr(skb, nlh, sizeof(u16), &abi_version,
 776                             IWPM_NLA_HELLO_ABI_VERSION);
 777         if (ret)
 778                 goto hello_num_error;
 779         nlmsg_end(skb, nlh);
 780
 781         ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
 782         if (ret) {
 783                 skb = NULL;
 784                 err_str = "Unable to send a nlmsg";
 785                 goto hello_num_error;
 786         }
 787         pr_debug("%s: Sent hello abi_version = %u\n", __func__, abi_version);
 788         return 0;
 789 hello_num_error:
 790         pr_info("%s: %s\n", __func__, err_str);
 791         dev_kfree_skb(skb);
 792         return ret;
 793 }