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         mutex_lock(&iwpm_admin_lock);
  58         if (atomic_read(&iwpm_admin.refcount) == 0) {
  59                 iwpm_hash_bucket = kzalloc(IWPM_MAPINFO_HASH_SIZE *
  60                                         sizeof(struct hlist_head), GFP_KERNEL);
  61                 if (!iwpm_hash_bucket) {
  62                         ret = -ENOMEM;
  63                         goto init_exit;
  64                 }
  65                 iwpm_reminfo_bucket = kzalloc(IWPM_REMINFO_HASH_SIZE *
  66                                         sizeof(struct hlist_head), GFP_KERNEL);
  67                 if (!iwpm_reminfo_bucket) {
  68                         kfree(iwpm_hash_bucket);
  69                         ret = -ENOMEM;
  70                         goto init_exit;
  71                 }
  72         }
  73         atomic_inc(&iwpm_admin.refcount);
  74 init_exit:
  75         mutex_unlock(&iwpm_admin_lock);
  76         if (!ret) {
  77                 iwpm_set_valid(nl_client, 1);
  78                 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
  79                 pr_debug("%s: Mapinfo and reminfo tables are created\n",
  80                                 __func__);
  81         }
  82         return ret;
  83 }
  84
  85 static void free_hash_bucket(void);
  86 static void free_reminfo_bucket(void);
  87
  88 int iwpm_exit(u8 nl_client)
  89 {
  90
  91         if (!iwpm_valid_client(nl_client))
  92                 return -EINVAL;
  93         mutex_lock(&iwpm_admin_lock);
  94         if (atomic_read(&iwpm_admin.refcount) == 0) {
  95                 mutex_unlock(&iwpm_admin_lock);
  96                 pr_err("%s Incorrect usage - negative refcount\n", __func__);
  97                 return -EINVAL;
  98         }
  99         if (atomic_dec_and_test(&iwpm_admin.refcount)) {
 100                 free_hash_bucket();
 101                 free_reminfo_bucket();
 102                 pr_debug("%s: Resources are destroyed\n", __func__);
 103         }
 104         mutex_unlock(&iwpm_admin_lock);
 105         iwpm_set_valid(nl_client, 0);
 106         iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
 107         return 0;
 108 }
 109
 110 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
 111                                                struct sockaddr_storage *);
 112
 113 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
 114                         struct sockaddr_storage *mapped_sockaddr,
 115                         u8 nl_client)
 116 {
 117         struct hlist_head *hash_bucket_head;
 118         struct iwpm_mapping_info *map_info;
 119         unsigned long flags;
 120         int ret = -EINVAL;
 121
 122         if (!iwpm_valid_client(nl_client))
 123                 return ret;
 124         map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
 125         if (!map_info)
 126                 return -ENOMEM;
 127
 128         memcpy(&map_info->local_sockaddr, local_sockaddr,
 129                sizeof(struct sockaddr_storage));
 130         memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
 131                sizeof(struct sockaddr_storage));
 132         map_info->nl_client = nl_client;
 133
 134         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 135         if (iwpm_hash_bucket) {
 136                 hash_bucket_head = get_mapinfo_hash_bucket(
 137                                         &map_info->local_sockaddr,
 138                                         &map_info->mapped_sockaddr);
 139                 if (hash_bucket_head) {
 140                         hlist_add_head(&map_info->hlist_node, hash_bucket_head);
 141                         ret = 0;
 142                 }
 143         }
 144         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 145         return ret;
 146 }
 147
 148 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
 149                         struct sockaddr_storage *mapped_local_addr)
 150 {
 151         struct hlist_node *tmp_hlist_node;
 152         struct hlist_head *hash_bucket_head;
 153         struct iwpm_mapping_info *map_info = NULL;
 154         unsigned long flags;
 155         int ret = -EINVAL;
 156
 157         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 158         if (iwpm_hash_bucket) {
 159                 hash_bucket_head = get_mapinfo_hash_bucket(
 160                                         local_sockaddr,
 161                                         mapped_local_addr);
 162                 if (!hash_bucket_head)
 163                         goto remove_mapinfo_exit;
 164
 165                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 166                                         hash_bucket_head, hlist_node) {
 167
 168                         if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
 169                                                 mapped_local_addr)) {
 170
 171                                 hlist_del_init(&map_info->hlist_node);
 172                                 kfree(map_info);
 173                                 ret = 0;
 174                                 break;
 175                         }
 176                 }
 177         }
 178 remove_mapinfo_exit:
 179         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 180         return ret;
 181 }
 182
 183 static void free_hash_bucket(void)
 184 {
 185         struct hlist_node *tmp_hlist_node;
 186         struct iwpm_mapping_info *map_info;
 187         unsigned long flags;
 188         int i;
 189
 190         /* remove all the mapinfo data from the list */
 191         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 192         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 193                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 194                         &iwpm_hash_bucket[i], hlist_node) {
 195
 196                                 hlist_del_init(&map_info->hlist_node);
 197                                 kfree(map_info);
 198                         }
 199         }
 200         /* free the hash list */
 201         kfree(iwpm_hash_bucket);
 202         iwpm_hash_bucket = NULL;
 203         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 204 }
 205
 206 static void free_reminfo_bucket(void)
 207 {
 208         struct hlist_node *tmp_hlist_node;
 209         struct iwpm_remote_info *rem_info;
 210         unsigned long flags;
 211         int i;
 212
 213         /* remove all the remote info from the list */
 214         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 215         for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
 216                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 217                         &iwpm_reminfo_bucket[i], hlist_node) {
 218
 219                                 hlist_del_init(&rem_info->hlist_node);
 220                                 kfree(rem_info);
 221                         }
 222         }
 223         /* free the hash list */
 224         kfree(iwpm_reminfo_bucket);
 225         iwpm_reminfo_bucket = NULL;
 226         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 227 }
 228
 229 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
 230                                                 struct sockaddr_storage *);
 231
 232 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
 233 {
 234         struct hlist_head *hash_bucket_head;
 235         unsigned long flags;
 236
 237         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 238         if (iwpm_reminfo_bucket) {
 239                 hash_bucket_head = get_reminfo_hash_bucket(
 240                                         &rem_info->mapped_loc_sockaddr,
 241                                         &rem_info->mapped_rem_sockaddr);
 242                 if (hash_bucket_head)
 243                         hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
 244         }
 245         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 246 }
 247
 248 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
 249                          struct sockaddr_storage *mapped_rem_addr,
 250                          struct sockaddr_storage *remote_addr,
 251                          u8 nl_client)
 252 {
 253         struct hlist_node *tmp_hlist_node;
 254         struct hlist_head *hash_bucket_head;
 255         struct iwpm_remote_info *rem_info = NULL;
 256         unsigned long flags;
 257         int ret = -EINVAL;
 258
 259         if (!iwpm_valid_client(nl_client)) {
 260                 pr_info("%s: Invalid client = %d\n", __func__, nl_client);
 261                 return ret;
 262         }
 263         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 264         if (iwpm_reminfo_bucket) {
 265                 hash_bucket_head = get_reminfo_hash_bucket(
 266                                         mapped_loc_addr,
 267                                         mapped_rem_addr);
 268                 if (!hash_bucket_head)
 269                         goto get_remote_info_exit;
 270                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 271                                         hash_bucket_head, hlist_node) {
 272
 273                         if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
 274                                 mapped_loc_addr) &&
 275                                 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
 276                                 mapped_rem_addr)) {
 277
 278                                 memcpy(remote_addr, &rem_info->remote_sockaddr,
 279                                         sizeof(struct sockaddr_storage));
 280                                 iwpm_print_sockaddr(remote_addr,
 281                                                 "get_remote_info: Remote sockaddr:");
 282
 283                                 hlist_del_init(&rem_info->hlist_node);
 284                                 kfree(rem_info);
 285                                 ret = 0;
 286                                 break;
 287                         }
 288                 }
 289         }
 290 get_remote_info_exit:
 291         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 292         return ret;
 293 }
 294
 295 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
 296                                         u8 nl_client, gfp_t gfp)
 297 {
 298         struct iwpm_nlmsg_request *nlmsg_request = NULL;
 299         unsigned long flags;
 300
 301         nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
 302         if (!nlmsg_request)
 303                 return NULL;
 304
 305         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 306         list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
 307         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 308
 309         kref_init(&nlmsg_request->kref);
 310         kref_get(&nlmsg_request->kref);
 311         nlmsg_request->nlmsg_seq = nlmsg_seq;
 312         nlmsg_request->nl_client = nl_client;
 313         nlmsg_request->request_done = 0;
 314         nlmsg_request->err_code = 0;
 315         sema_init(&nlmsg_request->sem, 1);
 316         down(&nlmsg_request->sem);
 317         return nlmsg_request;
 318 }
 319
 320 void iwpm_free_nlmsg_request(struct kref *kref)
 321 {
 322         struct iwpm_nlmsg_request *nlmsg_request;
 323         unsigned long flags;
 324
 325         nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
 326
 327         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 328         list_del_init(&nlmsg_request->inprocess_list);
 329         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 330
 331         if (!nlmsg_request->request_done)
 332                 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
 333                         __func__, nlmsg_request->nlmsg_seq);
 334         kfree(nlmsg_request);
 335 }
 336
 337 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
 338 {
 339         struct iwpm_nlmsg_request *nlmsg_request;
 340         struct iwpm_nlmsg_request *found_request = NULL;
 341         unsigned long flags;
 342
 343         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 344         list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
 345                             inprocess_list) {
 346                 if (nlmsg_request->nlmsg_seq == echo_seq) {
 347                         found_request = nlmsg_request;
 348                         kref_get(&nlmsg_request->kref);
 349                         break;
 350                 }
 351         }
 352         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 353         return found_request;
 354 }
 355
 356 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
 357 {
 358         int ret;
 359
 360         ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
 361         if (ret) {
 362                 ret = -EINVAL;
 363                 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
 364                         __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
 365         } else {
 366                 ret = nlmsg_request->err_code;
 367         }
 368         kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
 369         return ret;
 370 }
 371
 372 int iwpm_get_nlmsg_seq(void)
 373 {
 374         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
 375 }
 376
 377 int iwpm_valid_client(u8 nl_client)
 378 {
 379         return iwpm_admin.client_list[nl_client];
 380 }
 381
 382 void iwpm_set_valid(u8 nl_client, int valid)
 383 {
 384         iwpm_admin.client_list[nl_client] = valid;
 385 }
 386
 387 /* valid client */
 388 u32 iwpm_get_registration(u8 nl_client)
 389 {
 390         return iwpm_admin.reg_list[nl_client];
 391 }
 392
 393 /* valid client */
 394 void iwpm_set_registration(u8 nl_client, u32 reg)
 395 {
 396         iwpm_admin.reg_list[nl_client] = reg;
 397 }
 398
 399 /* valid client */
 400 u32 iwpm_check_registration(u8 nl_client, u32 reg)
 401 {
 402         return (iwpm_get_registration(nl_client) & reg);
 403 }
 404
 405 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 406                                 struct sockaddr_storage *b_sockaddr)
 407 {
 408         if (a_sockaddr->ss_family != b_sockaddr->ss_family)
 409                 return 1;
 410         if (a_sockaddr->ss_family == AF_INET) {
 411                 struct sockaddr_in *a4_sockaddr =
 412                         (struct sockaddr_in *)a_sockaddr;
 413                 struct sockaddr_in *b4_sockaddr =
 414                         (struct sockaddr_in *)b_sockaddr;
 415                 if (!memcmp(&a4_sockaddr->sin_addr,
 416                         &b4_sockaddr->sin_addr, sizeof(struct in_addr))
 417                         && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
 418                                 return 0;
 419
 420         } else if (a_sockaddr->ss_family == AF_INET6) {
 421                 struct sockaddr_in6 *a6_sockaddr =
 422                         (struct sockaddr_in6 *)a_sockaddr;
 423                 struct sockaddr_in6 *b6_sockaddr =
 424                         (struct sockaddr_in6 *)b_sockaddr;
 425                 if (!memcmp(&a6_sockaddr->sin6_addr,
 426                         &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
 427                         && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
 428                                 return 0;
 429
 430         } else {
 431                 pr_err("%s: Invalid sockaddr family\n", __func__);
 432         }
 433         return 1;
 434 }
 435
 436 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 437                                                 int nl_client)
 438 {
 439         struct sk_buff *skb = NULL;
 440
 441         skb = dev_alloc_skb(IWPM_MSG_SIZE);
 442         if (!skb) {
 443                 pr_err("%s Unable to allocate skb\n", __func__);
 444                 goto create_nlmsg_exit;
 445         }
 446         if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
 447                            NLM_F_REQUEST))) {
 448                 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
 449                 dev_kfree_skb(skb);
 450                 skb = NULL;
 451         }
 452 create_nlmsg_exit:
 453         return skb;
 454 }
 455
 456 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 457                                    const struct nla_policy *nlmsg_policy,
 458                                    struct nlattr *nltb[], const char *msg_type)
 459 {
 460         int nlh_len = 0;
 461         int ret;
 462         const char *err_str = "";
 463
 464         ret = nlmsg_validate(cb->nlh, nlh_len, policy_max - 1, nlmsg_policy,
 465                              NULL);
 466         if (ret) {
 467                 err_str = "Invalid attribute";
 468                 goto parse_nlmsg_error;
 469         }
 470         ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max - 1,
 471                           nlmsg_policy, NULL);
 472         if (ret) {
 473                 err_str = "Unable to parse the nlmsg";
 474                 goto parse_nlmsg_error;
 475         }
 476         ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
 477         if (ret) {
 478                 err_str = "Invalid NULL attribute";
 479                 goto parse_nlmsg_error;
 480         }
 481         return 0;
 482 parse_nlmsg_error:
 483         pr_warn("%s: %s (msg type %s ret = %d)\n",
 484                         __func__, err_str, msg_type, ret);
 485         return ret;
 486 }
 487
 488 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
 489 {
 490         struct sockaddr_in6 *sockaddr_v6;
 491         struct sockaddr_in *sockaddr_v4;
 492
 493         switch (sockaddr->ss_family) {
 494         case AF_INET:
 495                 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
 496                 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
 497                         msg, &sockaddr_v4->sin_addr,
 498                         ntohs(sockaddr_v4->sin_port),
 499                         ntohs(sockaddr_v4->sin_port));
 500                 break;
 501         case AF_INET6:
 502                 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
 503                 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
 504                         msg, &sockaddr_v6->sin6_addr,
 505                         ntohs(sockaddr_v6->sin6_port),
 506                         ntohs(sockaddr_v6->sin6_port));
 507                 break;
 508         default:
 509                 break;
 510         }
 511 }
 512
 513 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
 514 {
 515         u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
 516         u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
 517         return hash;
 518 }
 519
 520 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
 521 {
 522         u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
 523         u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
 524         return hash;
 525 }
 526
 527 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
 528                                 struct sockaddr_storage *b_sockaddr, u32 *hash)
 529 {
 530         u32 a_hash, b_hash;
 531
 532         if (a_sockaddr->ss_family == AF_INET) {
 533                 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
 534                 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
 535
 536         } else if (a_sockaddr->ss_family == AF_INET6) {
 537                 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
 538                 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
 539         } else {
 540                 pr_err("%s: Invalid sockaddr family\n", __func__);
 541                 return -EINVAL;
 542         }
 543
 544         if (a_hash == b_hash) /* if port mapper isn't available */
 545                 *hash = a_hash;
 546         else
 547                 *hash = jhash_2words(a_hash, b_hash, 0);
 548         return 0;
 549 }
 550
 551 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
 552                                 *local_sockaddr, struct sockaddr_storage
 553                                 *mapped_sockaddr)
 554 {
 555         u32 hash;
 556         int ret;
 557
 558         ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
 559         if (ret)
 560                 return NULL;
 561         return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
 562 }
 563
 564 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
 565                                 *mapped_loc_sockaddr, struct sockaddr_storage
 566                                 *mapped_rem_sockaddr)
 567 {
 568         u32 hash;
 569         int ret;
 570
 571         ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
 572         if (ret)
 573                 return NULL;
 574         return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
 575 }
 576
 577 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
 578 {
 579         struct sk_buff *skb = NULL;
 580         struct nlmsghdr *nlh;
 581         u32 msg_seq;
 582         const char *err_str = "";
 583         int ret = -EINVAL;
 584
 585         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
 586         if (!skb) {
 587                 err_str = "Unable to create a nlmsg";
 588                 goto mapinfo_num_error;
 589         }
 590         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 591         msg_seq = 0;
 592         err_str = "Unable to put attribute of mapinfo number nlmsg";
 593         ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
 594         if (ret)
 595                 goto mapinfo_num_error;
 596         ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 597                                 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
 598         if (ret)
 599                 goto mapinfo_num_error;
 600
 601         nlmsg_end(skb, nlh);
 602
 603         ret = rdma_nl_unicast(skb, iwpm_pid);
 604         if (ret) {
 605                 skb = NULL;
 606                 err_str = "Unable to send a nlmsg";
 607                 goto mapinfo_num_error;
 608         }
 609         pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
 610         return 0;
 611 mapinfo_num_error:
 612         pr_info("%s: %s\n", __func__, err_str);
 613         if (skb)
 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(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                         nlmsg_end(skb, nlh);
 686
 687                         iwpm_print_sockaddr(&map_info->local_sockaddr,
 688                                 "send_mapping_info: Local sockaddr:");
 689                         iwpm_print_sockaddr(&map_info->mapped_sockaddr,
 690                                 "send_mapping_info: Mapped local sockaddr:");
 691                         mapping_num++;
 692                         nlmsg_bytes += nlh->nlmsg_len;
 693
 694                         /* check if all mappings can fit in one skb */
 695                         if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
 696                                 /* and leave room for NLMSG_DONE */
 697                                 nlmsg_bytes = 0;
 698                                 skb_num++;
 699                                 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
 700                                                        flags);
 701                                 /* send the skb */
 702                                 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
 703                                 skb = NULL;
 704                                 if (ret) {
 705                                         err_str = "Unable to send map info";
 706                                         goto send_mapping_info_exit;
 707                                 }
 708                                 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
 709                                         ret = -ENOMEM;
 710                                         err_str = "Insufficient skbs for map info";
 711                                         goto send_mapping_info_exit;
 712                                 }
 713                                 skb = dev_alloc_skb(NLMSG_GOODSIZE);
 714                                 if (!skb) {
 715                                         ret = -ENOMEM;
 716                                         err_str = "Unable to allocate skb";
 717                                         goto send_mapping_info_exit;
 718                                 }
 719                                 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 720                         }
 721                 }
 722         }
 723 send_mapping_info_unlock:
 724         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 725 send_mapping_info_exit:
 726         if (ret) {
 727                 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
 728                 if (skb)
 729                         dev_kfree_skb(skb);
 730                 return ret;
 731         }
 732         send_nlmsg_done(skb, nl_client, iwpm_pid);
 733         return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
 734 }
 735
 736 int iwpm_mapinfo_available(void)
 737 {
 738         unsigned long flags;
 739         int full_bucket = 0, i = 0;
 740
 741         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 742         if (iwpm_hash_bucket) {
 743                 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 744                         if (!hlist_empty(&iwpm_hash_bucket[i])) {
 745                                 full_bucket = 1;
 746                                 break;
 747                         }
 748                 }
 749         }
 750         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 751         return full_bucket;
 752 }