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 DEFINE_MUTEX(iwpm_admin_lock);
  52 static struct iwpm_admin_data iwpm_admin;
  53
  54 int iwpm_init(u8 nl_client)
  55 {
  56         int ret = 0;
  57         if (iwpm_valid_client(nl_client))
  58                 return -EINVAL;
  59         mutex_lock(&iwpm_admin_lock);
  60         if (atomic_read(&iwpm_admin.refcount) == 0) {
  61                 iwpm_hash_bucket = kzalloc(IWPM_MAPINFO_HASH_SIZE *
  62                                         sizeof(struct hlist_head), GFP_KERNEL);
  63                 if (!iwpm_hash_bucket) {
  64                         ret = -ENOMEM;
  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                         goto init_exit;
  73                 }
  74         }
  75         atomic_inc(&iwpm_admin.refcount);
  76 init_exit:
  77         mutex_unlock(&iwpm_admin_lock);
  78         if (!ret) {
  79                 iwpm_set_valid(nl_client, 1);
  80                 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
  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         iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
 110         return 0;
 111 }
 112 EXPORT_SYMBOL(iwpm_exit);
 113
 114 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
 115                                                struct sockaddr_storage *);
 116
 117 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
 118                         struct sockaddr_storage *mapped_sockaddr,
 119                         u8 nl_client)
 120 {
 121         struct hlist_head *hash_bucket_head;
 122         struct iwpm_mapping_info *map_info;
 123         unsigned long flags;
 124         int ret = -EINVAL;
 125
 126         if (!iwpm_valid_client(nl_client))
 127                 return ret;
 128         map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
 129         if (!map_info)
 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                 return NULL;
 311
 312         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 313         list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
 314         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 315
 316         kref_init(&nlmsg_request->kref);
 317         kref_get(&nlmsg_request->kref);
 318         nlmsg_request->nlmsg_seq = nlmsg_seq;
 319         nlmsg_request->nl_client = nl_client;
 320         nlmsg_request->request_done = 0;
 321         nlmsg_request->err_code = 0;
 322         sema_init(&nlmsg_request->sem, 1);
 323         down(&nlmsg_request->sem);
 324         return nlmsg_request;
 325 }
 326
 327 void iwpm_free_nlmsg_request(struct kref *kref)
 328 {
 329         struct iwpm_nlmsg_request *nlmsg_request;
 330         unsigned long flags;
 331
 332         nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
 333
 334         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 335         list_del_init(&nlmsg_request->inprocess_list);
 336         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 337
 338         if (!nlmsg_request->request_done)
 339                 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
 340                         __func__, nlmsg_request->nlmsg_seq);
 341         kfree(nlmsg_request);
 342 }
 343
 344 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
 345 {
 346         struct iwpm_nlmsg_request *nlmsg_request;
 347         struct iwpm_nlmsg_request *found_request = NULL;
 348         unsigned long flags;
 349
 350         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 351         list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
 352                             inprocess_list) {
 353                 if (nlmsg_request->nlmsg_seq == echo_seq) {
 354                         found_request = nlmsg_request;
 355                         kref_get(&nlmsg_request->kref);
 356                         break;
 357                 }
 358         }
 359         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 360         return found_request;
 361 }
 362
 363 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
 364 {
 365         int ret;
 366
 367         ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
 368         if (ret) {
 369                 ret = -EINVAL;
 370                 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
 371                         __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
 372         } else {
 373                 ret = nlmsg_request->err_code;
 374         }
 375         kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
 376         return ret;
 377 }
 378
 379 int iwpm_get_nlmsg_seq(void)
 380 {
 381         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
 382 }
 383
 384 int iwpm_valid_client(u8 nl_client)
 385 {
 386         if (nl_client >= RDMA_NL_NUM_CLIENTS)
 387                 return 0;
 388         return iwpm_admin.client_list[nl_client];
 389 }
 390
 391 void iwpm_set_valid(u8 nl_client, int valid)
 392 {
 393         if (nl_client >= RDMA_NL_NUM_CLIENTS)
 394                 return;
 395         iwpm_admin.client_list[nl_client] = valid;
 396 }
 397
 398 /* valid client */
 399 u32 iwpm_get_registration(u8 nl_client)
 400 {
 401         return iwpm_admin.reg_list[nl_client];
 402 }
 403
 404 /* valid client */
 405 void iwpm_set_registration(u8 nl_client, u32 reg)
 406 {
 407         iwpm_admin.reg_list[nl_client] = reg;
 408 }
 409
 410 /* valid client */
 411 u32 iwpm_check_registration(u8 nl_client, u32 reg)
 412 {
 413         return (iwpm_get_registration(nl_client) & reg);
 414 }
 415
 416 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 417                                 struct sockaddr_storage *b_sockaddr)
 418 {
 419         if (a_sockaddr->ss_family != b_sockaddr->ss_family)
 420                 return 1;
 421         if (a_sockaddr->ss_family == AF_INET) {
 422                 struct sockaddr_in *a4_sockaddr =
 423                         (struct sockaddr_in *)a_sockaddr;
 424                 struct sockaddr_in *b4_sockaddr =
 425                         (struct sockaddr_in *)b_sockaddr;
 426                 if (!memcmp(&a4_sockaddr->sin_addr,
 427                         &b4_sockaddr->sin_addr, sizeof(struct in_addr))
 428                         && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
 429                                 return 0;
 430
 431         } else if (a_sockaddr->ss_family == AF_INET6) {
 432                 struct sockaddr_in6 *a6_sockaddr =
 433                         (struct sockaddr_in6 *)a_sockaddr;
 434                 struct sockaddr_in6 *b6_sockaddr =
 435                         (struct sockaddr_in6 *)b_sockaddr;
 436                 if (!memcmp(&a6_sockaddr->sin6_addr,
 437                         &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
 438                         && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
 439                                 return 0;
 440
 441         } else {
 442                 pr_err("%s: Invalid sockaddr family\n", __func__);
 443         }
 444         return 1;
 445 }
 446
 447 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 448                                                 int nl_client)
 449 {
 450         struct sk_buff *skb = NULL;
 451
 452         skb = dev_alloc_skb(IWPM_MSG_SIZE);
 453         if (!skb) {
 454                 pr_err("%s Unable to allocate skb\n", __func__);
 455                 goto create_nlmsg_exit;
 456         }
 457         if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
 458                            NLM_F_REQUEST))) {
 459                 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
 460                 dev_kfree_skb(skb);
 461                 skb = NULL;
 462         }
 463 create_nlmsg_exit:
 464         return skb;
 465 }
 466
 467 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 468                                    const struct nla_policy *nlmsg_policy,
 469                                    struct nlattr *nltb[], const char *msg_type)
 470 {
 471         int nlh_len = 0;
 472         int ret;
 473         const char *err_str = "";
 474
 475         ret = nlmsg_validate(cb->nlh, nlh_len, policy_max-1, nlmsg_policy);
 476         if (ret) {
 477                 err_str = "Invalid attribute";
 478                 goto parse_nlmsg_error;
 479         }
 480         ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max-1, nlmsg_policy);
 481         if (ret) {
 482                 err_str = "Unable to parse the nlmsg";
 483                 goto parse_nlmsg_error;
 484         }
 485         ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
 486         if (ret) {
 487                 err_str = "Invalid NULL attribute";
 488                 goto parse_nlmsg_error;
 489         }
 490         return 0;
 491 parse_nlmsg_error:
 492         pr_warn("%s: %s (msg type %s ret = %d)\n",
 493                         __func__, err_str, msg_type, ret);
 494         return ret;
 495 }
 496
 497 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
 498 {
 499         struct sockaddr_in6 *sockaddr_v6;
 500         struct sockaddr_in *sockaddr_v4;
 501
 502         switch (sockaddr->ss_family) {
 503         case AF_INET:
 504                 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
 505                 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
 506                         msg, &sockaddr_v4->sin_addr,
 507                         ntohs(sockaddr_v4->sin_port),
 508                         ntohs(sockaddr_v4->sin_port));
 509                 break;
 510         case AF_INET6:
 511                 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
 512                 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
 513                         msg, &sockaddr_v6->sin6_addr,
 514                         ntohs(sockaddr_v6->sin6_port),
 515                         ntohs(sockaddr_v6->sin6_port));
 516                 break;
 517         default:
 518                 break;
 519         }
 520 }
 521
 522 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
 523 {
 524         u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
 525         u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
 526         return hash;
 527 }
 528
 529 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
 530 {
 531         u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
 532         u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
 533         return hash;
 534 }
 535
 536 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
 537                                 struct sockaddr_storage *b_sockaddr, u32 *hash)
 538 {
 539         u32 a_hash, b_hash;
 540
 541         if (a_sockaddr->ss_family == AF_INET) {
 542                 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
 543                 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
 544
 545         } else if (a_sockaddr->ss_family == AF_INET6) {
 546                 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
 547                 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
 548         } else {
 549                 pr_err("%s: Invalid sockaddr family\n", __func__);
 550                 return -EINVAL;
 551         }
 552
 553         if (a_hash == b_hash) /* if port mapper isn't available */
 554                 *hash = a_hash;
 555         else
 556                 *hash = jhash_2words(a_hash, b_hash, 0);
 557         return 0;
 558 }
 559
 560 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
 561                                 *local_sockaddr, struct sockaddr_storage
 562                                 *mapped_sockaddr)
 563 {
 564         u32 hash;
 565         int ret;
 566
 567         ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
 568         if (ret)
 569                 return NULL;
 570         return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
 571 }
 572
 573 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
 574                                 *mapped_loc_sockaddr, struct sockaddr_storage
 575                                 *mapped_rem_sockaddr)
 576 {
 577         u32 hash;
 578         int ret;
 579
 580         ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
 581         if (ret)
 582                 return NULL;
 583         return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
 584 }
 585
 586 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
 587 {
 588         struct sk_buff *skb = NULL;
 589         struct nlmsghdr *nlh;
 590         u32 msg_seq;
 591         const char *err_str = "";
 592         int ret = -EINVAL;
 593
 594         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
 595         if (!skb) {
 596                 err_str = "Unable to create a nlmsg";
 597                 goto mapinfo_num_error;
 598         }
 599         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 600         msg_seq = 0;
 601         err_str = "Unable to put attribute of mapinfo number nlmsg";
 602         ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
 603         if (ret)
 604                 goto mapinfo_num_error;
 605         ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 606                                 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
 607         if (ret)
 608                 goto mapinfo_num_error;
 609         ret = ibnl_unicast(skb, nlh, iwpm_pid);
 610         if (ret) {
 611                 skb = NULL;
 612                 err_str = "Unable to send a nlmsg";
 613                 goto mapinfo_num_error;
 614         }
 615         pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
 616         return 0;
 617 mapinfo_num_error:
 618         pr_info("%s: %s\n", __func__, err_str);
 619         if (skb)
 620                 dev_kfree_skb(skb);
 621         return ret;
 622 }
 623
 624 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
 625 {
 626         struct nlmsghdr *nlh = NULL;
 627         int ret = 0;
 628
 629         if (!skb)
 630                 return ret;
 631         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 632                            RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 633                 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
 634                 dev_kfree_skb(skb);
 635                 return -ENOMEM;
 636         }
 637         nlh->nlmsg_type = NLMSG_DONE;
 638         ret = ibnl_unicast(skb, (struct nlmsghdr *)skb->data, iwpm_pid);
 639         if (ret)
 640                 pr_warn("%s Unable to send a nlmsg\n", __func__);
 641         return ret;
 642 }
 643
 644 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
 645 {
 646         struct iwpm_mapping_info *map_info;
 647         struct sk_buff *skb = NULL;
 648         struct nlmsghdr *nlh;
 649         int skb_num = 0, mapping_num = 0;
 650         int i = 0, nlmsg_bytes = 0;
 651         unsigned long flags;
 652         const char *err_str = "";
 653         int ret;
 654
 655         skb = dev_alloc_skb(NLMSG_GOODSIZE);
 656         if (!skb) {
 657                 ret = -ENOMEM;
 658                 err_str = "Unable to allocate skb";
 659                 goto send_mapping_info_exit;
 660         }
 661         skb_num++;
 662         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 663         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 664                 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
 665                                      hlist_node) {
 666                         if (map_info->nl_client != nl_client)
 667                                 continue;
 668                         nlh = NULL;
 669                         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 670                                         RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 671                                 ret = -ENOMEM;
 672                                 err_str = "Unable to put the nlmsg header";
 673                                 goto send_mapping_info_unlock;
 674                         }
 675                         err_str = "Unable to put attribute of the nlmsg";
 676                         ret = ibnl_put_attr(skb, nlh,
 677                                         sizeof(struct sockaddr_storage),
 678                                         &map_info->local_sockaddr,
 679                                         IWPM_NLA_MAPINFO_LOCAL_ADDR);
 680                         if (ret)
 681                                 goto send_mapping_info_unlock;
 682
 683                         ret = ibnl_put_attr(skb, nlh,
 684                                         sizeof(struct sockaddr_storage),
 685                                         &map_info->mapped_sockaddr,
 686                                         IWPM_NLA_MAPINFO_MAPPED_ADDR);
 687                         if (ret)
 688                                 goto send_mapping_info_unlock;
 689
 690                         iwpm_print_sockaddr(&map_info->local_sockaddr,
 691                                 "send_mapping_info: Local sockaddr:");
 692                         iwpm_print_sockaddr(&map_info->mapped_sockaddr,
 693                                 "send_mapping_info: Mapped local sockaddr:");
 694                         mapping_num++;
 695                         nlmsg_bytes += nlh->nlmsg_len;
 696
 697                         /* check if all mappings can fit in one skb */
 698                         if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
 699                                 /* and leave room for NLMSG_DONE */
 700                                 nlmsg_bytes = 0;
 701                                 skb_num++;
 702                                 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
 703                                                        flags);
 704                                 /* send the skb */
 705                                 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
 706                                 skb = NULL;
 707                                 if (ret) {
 708                                         err_str = "Unable to send map info";
 709                                         goto send_mapping_info_exit;
 710                                 }
 711                                 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
 712                                         ret = -ENOMEM;
 713                                         err_str = "Insufficient skbs for map info";
 714                                         goto send_mapping_info_exit;
 715                                 }
 716                                 skb = dev_alloc_skb(NLMSG_GOODSIZE);
 717                                 if (!skb) {
 718                                         ret = -ENOMEM;
 719                                         err_str = "Unable to allocate skb";
 720                                         goto send_mapping_info_exit;
 721                                 }
 722                                 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 723                         }
 724                 }
 725         }
 726 send_mapping_info_unlock:
 727         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 728 send_mapping_info_exit:
 729         if (ret) {
 730                 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
 731                 if (skb)
 732                         dev_kfree_skb(skb);
 733                 return ret;
 734         }
 735         send_nlmsg_done(skb, nl_client, iwpm_pid);
 736         return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
 737 }
 738
 739 int iwpm_mapinfo_available(void)
 740 {
 741         unsigned long flags;
 742         int full_bucket = 0, i = 0;
 743
 744         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 745         if (iwpm_hash_bucket) {
 746                 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 747                         if (!hlist_empty(&iwpm_hash_bucket[i])) {
 748                                 full_bucket = 1;
 749                                 break;
 750                         }
 751                 }
 752         }
 753         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 754         return full_bucket;
 755 }