kernel/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
  41 static LIST_HEAD(iwpm_nlmsg_req_list);
  42 static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
  43
  44 static struct hlist_head *iwpm_hash_bucket;
  45 static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
  46
  47 static struct hlist_head *iwpm_reminfo_bucket;
  48 static DEFINE_SPINLOCK(iwpm_reminfo_lock);
  49
  50 static DEFINE_MUTEX(iwpm_admin_lock);
  51 static struct iwpm_admin_data iwpm_admin;
  52
  53 int iwpm_init(u8 nl_client)
  54 {
  55         int ret = 0;
  56         if (iwpm_valid_client(nl_client))
  57                 return -EINVAL;
  58         mutex_lock(&iwpm_admin_lock);
  59         if (atomic_read(&iwpm_admin.refcount) == 0) {
  60                 iwpm_hash_bucket = kzalloc(IWPM_MAPINFO_HASH_SIZE *
  61                                         sizeof(struct hlist_head), GFP_KERNEL);
  62                 if (!iwpm_hash_bucket) {
  63                         ret = -ENOMEM;
  64                         pr_err("%s Unable to create mapinfo hash table\n", __func__);
  65                         goto init_exit;
  66                 }
  67                 iwpm_reminfo_bucket = kzalloc(IWPM_REMINFO_HASH_SIZE *
  68                                         sizeof(struct hlist_head), GFP_KERNEL);
  69                 if (!iwpm_reminfo_bucket) {
  70                         kfree(iwpm_hash_bucket);
  71                         ret = -ENOMEM;
  72                         pr_err("%s Unable to create reminfo hash table\n", __func__);
  73                         goto init_exit;
  74                 }
  75         }
  76         atomic_inc(&iwpm_admin.refcount);
  77 init_exit:
  78         mutex_unlock(&iwpm_admin_lock);
  79         if (!ret) {
  80                 iwpm_set_valid(nl_client, 1);
  81                 pr_debug("%s: Mapinfo and reminfo tables are created\n",
  82                                 __func__);
  83         }
  84         return ret;
  85 }
  86 EXPORT_SYMBOL(iwpm_init);
  87
  88 static void free_hash_bucket(void);
  89 static void free_reminfo_bucket(void);
  90
  91 int iwpm_exit(u8 nl_client)
  92 {
  93
  94         if (!iwpm_valid_client(nl_client))
  95                 return -EINVAL;
  96         mutex_lock(&iwpm_admin_lock);
  97         if (atomic_read(&iwpm_admin.refcount) == 0) {
  98                 mutex_unlock(&iwpm_admin_lock);
  99                 pr_err("%s Incorrect usage - negative refcount\n", __func__);
 100                 return -EINVAL;
 101         }
 102         if (atomic_dec_and_test(&iwpm_admin.refcount)) {
 103                 free_hash_bucket();
 104                 free_reminfo_bucket();
 105                 pr_debug("%s: Resources are destroyed\n", __func__);
 106         }
 107         mutex_unlock(&iwpm_admin_lock);
 108         iwpm_set_valid(nl_client, 0);
 109         return 0;
 110 }
 111 EXPORT_SYMBOL(iwpm_exit);
 112
 113 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
 114                                                struct sockaddr_storage *);
 115
 116 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
 117                         struct sockaddr_storage *mapped_sockaddr,
 118                         u8 nl_client)
 119 {
 120         struct hlist_head *hash_bucket_head;
 121         struct iwpm_mapping_info *map_info;
 122         unsigned long flags;
 123         int ret = -EINVAL;
 124
 125         if (!iwpm_valid_client(nl_client))
 126                 return ret;
 127         map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
 128         if (!map_info) {
 129                 pr_err("%s: Unable to allocate a mapping info\n", __func__);
 130                 return -ENOMEM;
 131         }
 132         memcpy(&map_info->local_sockaddr, local_sockaddr,
 133                sizeof(struct sockaddr_storage));
 134         memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
 135                sizeof(struct sockaddr_storage));
 136         map_info->nl_client = nl_client;
 137
 138         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 139         if (iwpm_hash_bucket) {
 140                 hash_bucket_head = get_mapinfo_hash_bucket(
 141                                         &map_info->local_sockaddr,
 142                                         &map_info->mapped_sockaddr);
 143                 if (hash_bucket_head) {
 144                         hlist_add_head(&map_info->hlist_node, hash_bucket_head);
 145                         ret = 0;
 146                 }
 147         }
 148         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 149         return ret;
 150 }
 151 EXPORT_SYMBOL(iwpm_create_mapinfo);
 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 EXPORT_SYMBOL(iwpm_remove_mapinfo);
 188
 189 static void free_hash_bucket(void)
 190 {
 191         struct hlist_node *tmp_hlist_node;
 192         struct iwpm_mapping_info *map_info;
 193         unsigned long flags;
 194         int i;
 195
 196         /* remove all the mapinfo data from the list */
 197         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 198         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 199                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 200                         &iwpm_hash_bucket[i], hlist_node) {
 201
 202                                 hlist_del_init(&map_info->hlist_node);
 203                                 kfree(map_info);
 204                         }
 205         }
 206         /* free the hash list */
 207         kfree(iwpm_hash_bucket);
 208         iwpm_hash_bucket = NULL;
 209         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 210 }
 211
 212 static void free_reminfo_bucket(void)
 213 {
 214         struct hlist_node *tmp_hlist_node;
 215         struct iwpm_remote_info *rem_info;
 216         unsigned long flags;
 217         int i;
 218
 219         /* remove all the remote info from the list */
 220         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 221         for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
 222                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 223                         &iwpm_reminfo_bucket[i], hlist_node) {
 224
 225                                 hlist_del_init(&rem_info->hlist_node);
 226                                 kfree(rem_info);
 227                         }
 228         }
 229         /* free the hash list */
 230         kfree(iwpm_reminfo_bucket);
 231         iwpm_reminfo_bucket = NULL;
 232         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 233 }
 234
 235 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
 236                                                 struct sockaddr_storage *);
 237
 238 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
 239 {
 240         struct hlist_head *hash_bucket_head;
 241         unsigned long flags;
 242
 243         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 244         if (iwpm_reminfo_bucket) {
 245                 hash_bucket_head = get_reminfo_hash_bucket(
 246                                         &rem_info->mapped_loc_sockaddr,
 247                                         &rem_info->mapped_rem_sockaddr);
 248                 if (hash_bucket_head)
 249                         hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
 250         }
 251         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 252 }
 253
 254 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
 255                                 struct sockaddr_storage *mapped_rem_addr,
 256                                 struct sockaddr_storage *remote_addr,
 257                                 u8 nl_client)
 258 {
 259         struct hlist_node *tmp_hlist_node;
 260         struct hlist_head *hash_bucket_head;
 261         struct iwpm_remote_info *rem_info = NULL;
 262         unsigned long flags;
 263         int ret = -EINVAL;
 264
 265         if (!iwpm_valid_client(nl_client)) {
 266                 pr_info("%s: Invalid client = %d\n", __func__, nl_client);
 267                 return ret;
 268         }
 269         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 270         if (iwpm_reminfo_bucket) {
 271                 hash_bucket_head = get_reminfo_hash_bucket(
 272                                         mapped_loc_addr,
 273                                         mapped_rem_addr);
 274                 if (!hash_bucket_head)
 275                         goto get_remote_info_exit;
 276                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 277                                         hash_bucket_head, hlist_node) {
 278
 279                         if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
 280                                 mapped_loc_addr) &&
 281                                 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
 282                                 mapped_rem_addr)) {
 283
 284                                 memcpy(remote_addr, &rem_info->remote_sockaddr,
 285                                         sizeof(struct sockaddr_storage));
 286                                 iwpm_print_sockaddr(remote_addr,
 287                                                 "get_remote_info: Remote sockaddr:");
 288
 289                                 hlist_del_init(&rem_info->hlist_node);
 290                                 kfree(rem_info);
 291                                 ret = 0;
 292                                 break;
 293                         }
 294                 }
 295         }
 296 get_remote_info_exit:
 297         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 298         return ret;
 299 }
 300 EXPORT_SYMBOL(iwpm_get_remote_info);
 301
 302 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
 303                                         u8 nl_client, gfp_t gfp)
 304 {
 305         struct iwpm_nlmsg_request *nlmsg_request = NULL;
 306         unsigned long flags;
 307
 308         nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
 309         if (!nlmsg_request) {
 310                 pr_err("%s Unable to allocate a nlmsg_request\n", __func__);
 311                 return NULL;
 312         }
 313         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 314         list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
 315         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 316
 317         kref_init(&nlmsg_request->kref);
 318         kref_get(&nlmsg_request->kref);
 319         nlmsg_request->nlmsg_seq = nlmsg_seq;
 320         nlmsg_request->nl_client = nl_client;
 321         nlmsg_request->request_done = 0;
 322         nlmsg_request->err_code = 0;
 323         return nlmsg_request;
 324 }
 325
 326 void iwpm_free_nlmsg_request(struct kref *kref)
 327 {
 328         struct iwpm_nlmsg_request *nlmsg_request;
 329         unsigned long flags;
 330
 331         nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
 332
 333         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 334         list_del_init(&nlmsg_request->inprocess_list);
 335         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 336
 337         if (!nlmsg_request->request_done)
 338                 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
 339                         __func__, nlmsg_request->nlmsg_seq);
 340         kfree(nlmsg_request);
 341 }
 342
 343 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
 344 {
 345         struct iwpm_nlmsg_request *nlmsg_request;
 346         struct iwpm_nlmsg_request *found_request = NULL;
 347         unsigned long flags;
 348
 349         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 350         list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
 351                             inprocess_list) {
 352                 if (nlmsg_request->nlmsg_seq == echo_seq) {
 353                         found_request = nlmsg_request;
 354                         kref_get(&nlmsg_request->kref);
 355                         break;
 356                 }
 357         }
 358         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 359         return found_request;
 360 }
 361
 362 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
 363 {
 364         int ret;
 365         init_waitqueue_head(&nlmsg_request->waitq);
 366
 367         ret = wait_event_timeout(nlmsg_request->waitq,
 368                         (nlmsg_request->request_done != 0), IWPM_NL_TIMEOUT);
 369         if (!ret) {
 370                 ret = -EINVAL;
 371                 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
 372                         __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
 373         } else {
 374                 ret = nlmsg_request->err_code;
 375         }
 376         kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
 377         return ret;
 378 }
 379
 380 int iwpm_get_nlmsg_seq(void)
 381 {
 382         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
 383 }
 384
 385 int iwpm_valid_client(u8 nl_client)
 386 {
 387         if (nl_client >= RDMA_NL_NUM_CLIENTS)
 388                 return 0;
 389         return iwpm_admin.client_list[nl_client];
 390 }
 391
 392 void iwpm_set_valid(u8 nl_client, int valid)
 393 {
 394         if (nl_client >= RDMA_NL_NUM_CLIENTS)
 395                 return;
 396         iwpm_admin.client_list[nl_client] = valid;
 397 }
 398
 399 /* valid client */
 400 int iwpm_registered_client(u8 nl_client)
 401 {
 402         return iwpm_admin.reg_list[nl_client];
 403 }
 404
 405 /* valid client */
 406 void iwpm_set_registered(u8 nl_client, int reg)
 407 {
 408         iwpm_admin.reg_list[nl_client] = reg;
 409 }
 410
 411 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 412                                 struct sockaddr_storage *b_sockaddr)
 413 {
 414         if (a_sockaddr->ss_family != b_sockaddr->ss_family)
 415                 return 1;
 416         if (a_sockaddr->ss_family == AF_INET) {
 417                 struct sockaddr_in *a4_sockaddr =
 418                         (struct sockaddr_in *)a_sockaddr;
 419                 struct sockaddr_in *b4_sockaddr =
 420                         (struct sockaddr_in *)b_sockaddr;
 421                 if (!memcmp(&a4_sockaddr->sin_addr,
 422                         &b4_sockaddr->sin_addr, sizeof(struct in_addr))
 423                         && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
 424                                 return 0;
 425
 426         } else if (a_sockaddr->ss_family == AF_INET6) {
 427                 struct sockaddr_in6 *a6_sockaddr =
 428                         (struct sockaddr_in6 *)a_sockaddr;
 429                 struct sockaddr_in6 *b6_sockaddr =
 430                         (struct sockaddr_in6 *)b_sockaddr;
 431                 if (!memcmp(&a6_sockaddr->sin6_addr,
 432                         &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
 433                         && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
 434                                 return 0;
 435
 436         } else {
 437                 pr_err("%s: Invalid sockaddr family\n", __func__);
 438         }
 439         return 1;
 440 }
 441
 442 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 443                                                 int nl_client)
 444 {
 445         struct sk_buff *skb = NULL;
 446
 447         skb = dev_alloc_skb(NLMSG_GOODSIZE);
 448         if (!skb) {
 449                 pr_err("%s Unable to allocate skb\n", __func__);
 450                 goto create_nlmsg_exit;
 451         }
 452         if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
 453                            NLM_F_REQUEST))) {
 454                 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
 455                 dev_kfree_skb(skb);
 456                 skb = NULL;
 457         }
 458 create_nlmsg_exit:
 459         return skb;
 460 }
 461
 462 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 463                                    const struct nla_policy *nlmsg_policy,
 464                                    struct nlattr *nltb[], const char *msg_type)
 465 {
 466         int nlh_len = 0;
 467         int ret;
 468         const char *err_str = "";
 469
 470         ret = nlmsg_validate(cb->nlh, nlh_len, policy_max-1, nlmsg_policy);
 471         if (ret) {
 472                 err_str = "Invalid attribute";
 473                 goto parse_nlmsg_error;
 474         }
 475         ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max-1, nlmsg_policy);
 476         if (ret) {
 477                 err_str = "Unable to parse the nlmsg";
 478                 goto parse_nlmsg_error;
 479         }
 480         ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
 481         if (ret) {
 482                 err_str = "Invalid NULL attribute";
 483                 goto parse_nlmsg_error;
 484         }
 485         return 0;
 486 parse_nlmsg_error:
 487         pr_warn("%s: %s (msg type %s ret = %d)\n",
 488                         __func__, err_str, msg_type, ret);
 489         return ret;
 490 }
 491
 492 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
 493 {
 494         struct sockaddr_in6 *sockaddr_v6;
 495         struct sockaddr_in *sockaddr_v4;
 496
 497         switch (sockaddr->ss_family) {
 498         case AF_INET:
 499                 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
 500                 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
 501                         msg, &sockaddr_v4->sin_addr,
 502                         ntohs(sockaddr_v4->sin_port),
 503                         ntohs(sockaddr_v4->sin_port));
 504                 break;
 505         case AF_INET6:
 506                 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
 507                 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
 508                         msg, &sockaddr_v6->sin6_addr,
 509                         ntohs(sockaddr_v6->sin6_port),
 510                         ntohs(sockaddr_v6->sin6_port));
 511                 break;
 512         default:
 513                 break;
 514         }
 515 }
 516
 517 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
 518 {
 519         u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
 520         u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
 521         return hash;
 522 }
 523
 524 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
 525 {
 526         u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
 527         u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
 528         return hash;
 529 }
 530
 531 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
 532                                 struct sockaddr_storage *b_sockaddr, u32 *hash)
 533 {
 534         u32 a_hash, b_hash;
 535
 536         if (a_sockaddr->ss_family == AF_INET) {
 537                 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
 538                 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
 539
 540         } else if (a_sockaddr->ss_family == AF_INET6) {
 541                 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
 542                 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
 543         } else {
 544                 pr_err("%s: Invalid sockaddr family\n", __func__);
 545                 return -EINVAL;
 546         }
 547
 548         if (a_hash == b_hash) /* if port mapper isn't available */
 549                 *hash = a_hash;
 550         else
 551                 *hash = jhash_2words(a_hash, b_hash, 0);
 552         return 0;
 553 }
 554
 555 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
 556                                 *local_sockaddr, struct sockaddr_storage
 557                                 *mapped_sockaddr)
 558 {
 559         u32 hash;
 560         int ret;
 561
 562         ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
 563         if (ret)
 564                 return NULL;
 565         return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
 566 }
 567
 568 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
 569                                 *mapped_loc_sockaddr, struct sockaddr_storage
 570                                 *mapped_rem_sockaddr)
 571 {
 572         u32 hash;
 573         int ret;
 574
 575         ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
 576         if (ret)
 577                 return NULL;
 578         return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
 579 }
 580
 581 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
 582 {
 583         struct sk_buff *skb = NULL;
 584         struct nlmsghdr *nlh;
 585         u32 msg_seq;
 586         const char *err_str = "";
 587         int ret = -EINVAL;
 588
 589         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
 590         if (!skb) {
 591                 err_str = "Unable to create a nlmsg";
 592                 goto mapinfo_num_error;
 593         }
 594         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 595         msg_seq = 0;
 596         err_str = "Unable to put attribute of mapinfo number nlmsg";
 597         ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
 598         if (ret)
 599                 goto mapinfo_num_error;
 600         ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 601                                 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
 602         if (ret)
 603                 goto mapinfo_num_error;
 604         ret = ibnl_unicast(skb, nlh, 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 = %d\n", __func__, mapping_num);
 611         return 0;
 612 mapinfo_num_error:
 613         pr_info("%s: %s\n", __func__, err_str);
 614         if (skb)
 615                 dev_kfree_skb(skb);
 616         return ret;
 617 }
 618
 619 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
 620 {
 621         struct nlmsghdr *nlh = NULL;
 622         int ret = 0;
 623
 624         if (!skb)
 625                 return ret;
 626         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 627                            RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 628                 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
 629                 return -ENOMEM;
 630         }
 631         nlh->nlmsg_type = NLMSG_DONE;
 632         ret = ibnl_unicast(skb, (struct nlmsghdr *)skb->data, 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         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 658                 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
 659                                      hlist_node) {
 660                         if (map_info->nl_client != nl_client)
 661                                 continue;
 662                         nlh = NULL;
 663                         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 664                                         RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 665                                 ret = -ENOMEM;
 666                                 err_str = "Unable to put the nlmsg header";
 667                                 goto send_mapping_info_unlock;
 668                         }
 669                         err_str = "Unable to put attribute of the nlmsg";
 670                         ret = ibnl_put_attr(skb, nlh,
 671                                         sizeof(struct sockaddr_storage),
 672                                         &map_info->local_sockaddr,
 673                                         IWPM_NLA_MAPINFO_LOCAL_ADDR);
 674                         if (ret)
 675                                 goto send_mapping_info_unlock;
 676
 677                         ret = ibnl_put_attr(skb, nlh,
 678                                         sizeof(struct sockaddr_storage),
 679                                         &map_info->mapped_sockaddr,
 680                                         IWPM_NLA_MAPINFO_MAPPED_ADDR);
 681                         if (ret)
 682                                 goto send_mapping_info_unlock;
 683
 684                         iwpm_print_sockaddr(&map_info->local_sockaddr,
 685                                 "send_mapping_info: Local sockaddr:");
 686                         iwpm_print_sockaddr(&map_info->mapped_sockaddr,
 687                                 "send_mapping_info: Mapped local sockaddr:");
 688                         mapping_num++;
 689                         nlmsg_bytes += nlh->nlmsg_len;
 690
 691                         /* check if all mappings can fit in one skb */
 692                         if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
 693                                 /* and leave room for NLMSG_DONE */
 694                                 nlmsg_bytes = 0;
 695                                 skb_num++;
 696                                 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
 697                                                        flags);
 698                                 /* send the skb */
 699                                 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
 700                                 skb = NULL;
 701                                 if (ret) {
 702                                         err_str = "Unable to send map info";
 703                                         goto send_mapping_info_exit;
 704                                 }
 705                                 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
 706                                         ret = -ENOMEM;
 707                                         err_str = "Insufficient skbs for map info";
 708                                         goto send_mapping_info_exit;
 709                                 }
 710                                 skb = dev_alloc_skb(NLMSG_GOODSIZE);
 711                                 if (!skb) {
 712                                         ret = -ENOMEM;
 713                                         err_str = "Unable to allocate skb";
 714                                         goto send_mapping_info_exit;
 715                                 }
 716                                 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 717                         }
 718                 }
 719         }
 720 send_mapping_info_unlock:
 721         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 722 send_mapping_info_exit:
 723         if (ret) {
 724                 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
 725                 if (skb)
 726                         dev_kfree_skb(skb);
 727                 return ret;
 728         }
 729         send_nlmsg_done(skb, nl_client, iwpm_pid);
 730         return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
 731 }
 732
 733 int iwpm_mapinfo_available(void)
 734 {
 735         unsigned long flags;
 736         int full_bucket = 0, i = 0;
 737
 738         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 739         if (iwpm_hash_bucket) {
 740                 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 741                         if (!hlist_empty(&iwpm_hash_bucket[i])) {
 742                                 full_bucket = 1;
 743                                 break;
 744                         }
 745                 }
 746         }
 747         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 748         return full_bucket;
 749 }