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 = kcalloc(IWPM_MAPINFO_HASH_SIZE,
  60                                            sizeof(struct hlist_head),
  61                                            GFP_KERNEL);
  62                 if (!iwpm_hash_bucket) {
  63                         ret = -ENOMEM;
  64                         goto init_exit;
  65                 }
  66                 iwpm_reminfo_bucket = kcalloc(IWPM_REMINFO_HASH_SIZE,
  67                                               sizeof(struct hlist_head),
  68                                               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
  87 static void free_hash_bucket(void);
  88 static void free_reminfo_bucket(void);
  89
  90 int iwpm_exit(u8 nl_client)
  91 {
  92
  93         if (!iwpm_valid_client(nl_client))
  94                 return -EINVAL;
  95         mutex_lock(&iwpm_admin_lock);
  96         if (atomic_read(&iwpm_admin.refcount) == 0) {
  97                 mutex_unlock(&iwpm_admin_lock);
  98                 pr_err("%s Incorrect usage - negative refcount\n", __func__);
  99                 return -EINVAL;
 100         }
 101         if (atomic_dec_and_test(&iwpm_admin.refcount)) {
 102                 free_hash_bucket();
 103                 free_reminfo_bucket();
 104                 pr_debug("%s: Resources are destroyed\n", __func__);
 105         }
 106         mutex_unlock(&iwpm_admin_lock);
 107         iwpm_set_valid(nl_client, 0);
 108         iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
 109         return 0;
 110 }
 111
 112 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
 113                                                struct sockaddr_storage *);
 114
 115 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
 116                         struct sockaddr_storage *mapped_sockaddr,
 117                         u8 nl_client)
 118 {
 119         struct hlist_head *hash_bucket_head = NULL;
 120         struct iwpm_mapping_info *map_info;
 121         unsigned long flags;
 122         int ret = -EINVAL;
 123
 124         if (!iwpm_valid_client(nl_client))
 125                 return ret;
 126         map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
 127         if (!map_info)
 128                 return -ENOMEM;
 129
 130         memcpy(&map_info->local_sockaddr, local_sockaddr,
 131                sizeof(struct sockaddr_storage));
 132         memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
 133                sizeof(struct sockaddr_storage));
 134         map_info->nl_client = nl_client;
 135
 136         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 137         if (iwpm_hash_bucket) {
 138                 hash_bucket_head = get_mapinfo_hash_bucket(
 139                                         &map_info->local_sockaddr,
 140                                         &map_info->mapped_sockaddr);
 141                 if (hash_bucket_head) {
 142                         hlist_add_head(&map_info->hlist_node, hash_bucket_head);
 143                         ret = 0;
 144                 }
 145         }
 146         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 147
 148         if (!hash_bucket_head)
 149                 kfree(map_info);
 150         return ret;
 151 }
 152
 153 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
 154                         struct sockaddr_storage *mapped_local_addr)
 155 {
 156         struct hlist_node *tmp_hlist_node;
 157         struct hlist_head *hash_bucket_head;
 158         struct iwpm_mapping_info *map_info = NULL;
 159         unsigned long flags;
 160         int ret = -EINVAL;
 161
 162         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 163         if (iwpm_hash_bucket) {
 164                 hash_bucket_head = get_mapinfo_hash_bucket(
 165                                         local_sockaddr,
 166                                         mapped_local_addr);
 167                 if (!hash_bucket_head)
 168                         goto remove_mapinfo_exit;
 169
 170                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 171                                         hash_bucket_head, hlist_node) {
 172
 173                         if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
 174                                                 mapped_local_addr)) {
 175
 176                                 hlist_del_init(&map_info->hlist_node);
 177                                 kfree(map_info);
 178                                 ret = 0;
 179                                 break;
 180                         }
 181                 }
 182         }
 183 remove_mapinfo_exit:
 184         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 185         return ret;
 186 }
 187
 188 static void free_hash_bucket(void)
 189 {
 190         struct hlist_node *tmp_hlist_node;
 191         struct iwpm_mapping_info *map_info;
 192         unsigned long flags;
 193         int i;
 194
 195         /* remove all the mapinfo data from the list */
 196         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 197         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 198                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 199                         &iwpm_hash_bucket[i], hlist_node) {
 200
 201                                 hlist_del_init(&map_info->hlist_node);
 202                                 kfree(map_info);
 203                         }
 204         }
 205         /* free the hash list */
 206         kfree(iwpm_hash_bucket);
 207         iwpm_hash_bucket = NULL;
 208         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 209 }
 210
 211 static void free_reminfo_bucket(void)
 212 {
 213         struct hlist_node *tmp_hlist_node;
 214         struct iwpm_remote_info *rem_info;
 215         unsigned long flags;
 216         int i;
 217
 218         /* remove all the remote info from the list */
 219         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 220         for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
 221                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 222                         &iwpm_reminfo_bucket[i], hlist_node) {
 223
 224                                 hlist_del_init(&rem_info->hlist_node);
 225                                 kfree(rem_info);
 226                         }
 227         }
 228         /* free the hash list */
 229         kfree(iwpm_reminfo_bucket);
 230         iwpm_reminfo_bucket = NULL;
 231         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 232 }
 233
 234 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
 235                                                 struct sockaddr_storage *);
 236
 237 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
 238 {
 239         struct hlist_head *hash_bucket_head;
 240         unsigned long flags;
 241
 242         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 243         if (iwpm_reminfo_bucket) {
 244                 hash_bucket_head = get_reminfo_hash_bucket(
 245                                         &rem_info->mapped_loc_sockaddr,
 246                                         &rem_info->mapped_rem_sockaddr);
 247                 if (hash_bucket_head)
 248                         hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
 249         }
 250         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 251 }
 252
 253 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
 254                          struct sockaddr_storage *mapped_rem_addr,
 255                          struct sockaddr_storage *remote_addr,
 256                          u8 nl_client)
 257 {
 258         struct hlist_node *tmp_hlist_node;
 259         struct hlist_head *hash_bucket_head;
 260         struct iwpm_remote_info *rem_info = NULL;
 261         unsigned long flags;
 262         int ret = -EINVAL;
 263
 264         if (!iwpm_valid_client(nl_client)) {
 265                 pr_info("%s: Invalid client = %d\n", __func__, nl_client);
 266                 return ret;
 267         }
 268         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 269         if (iwpm_reminfo_bucket) {
 270                 hash_bucket_head = get_reminfo_hash_bucket(
 271                                         mapped_loc_addr,
 272                                         mapped_rem_addr);
 273                 if (!hash_bucket_head)
 274                         goto get_remote_info_exit;
 275                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 276                                         hash_bucket_head, hlist_node) {
 277
 278                         if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
 279                                 mapped_loc_addr) &&
 280                                 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
 281                                 mapped_rem_addr)) {
 282
 283                                 memcpy(remote_addr, &rem_info->remote_sockaddr,
 284                                         sizeof(struct sockaddr_storage));
 285                                 iwpm_print_sockaddr(remote_addr,
 286                                                 "get_remote_info: Remote sockaddr:");
 287
 288                                 hlist_del_init(&rem_info->hlist_node);
 289                                 kfree(rem_info);
 290                                 ret = 0;
 291                                 break;
 292                         }
 293                 }
 294         }
 295 get_remote_info_exit:
 296         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 297         return ret;
 298 }
 299
 300 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
 301                                         u8 nl_client, gfp_t gfp)
 302 {
 303         struct iwpm_nlmsg_request *nlmsg_request = NULL;
 304         unsigned long flags;
 305
 306         nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
 307         if (!nlmsg_request)
 308                 return NULL;
 309
 310         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 311         list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
 312         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 313
 314         kref_init(&nlmsg_request->kref);
 315         kref_get(&nlmsg_request->kref);
 316         nlmsg_request->nlmsg_seq = nlmsg_seq;
 317         nlmsg_request->nl_client = nl_client;
 318         nlmsg_request->request_done = 0;
 319         nlmsg_request->err_code = 0;
 320         sema_init(&nlmsg_request->sem, 1);
 321         down(&nlmsg_request->sem);
 322         return nlmsg_request;
 323 }
 324
 325 void iwpm_free_nlmsg_request(struct kref *kref)
 326 {
 327         struct iwpm_nlmsg_request *nlmsg_request;
 328         unsigned long flags;
 329
 330         nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
 331
 332         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 333         list_del_init(&nlmsg_request->inprocess_list);
 334         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 335
 336         if (!nlmsg_request->request_done)
 337                 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
 338                         __func__, nlmsg_request->nlmsg_seq);
 339         kfree(nlmsg_request);
 340 }
 341
 342 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
 343 {
 344         struct iwpm_nlmsg_request *nlmsg_request;
 345         struct iwpm_nlmsg_request *found_request = NULL;
 346         unsigned long flags;
 347
 348         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 349         list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
 350                             inprocess_list) {
 351                 if (nlmsg_request->nlmsg_seq == echo_seq) {
 352                         found_request = nlmsg_request;
 353                         kref_get(&nlmsg_request->kref);
 354                         break;
 355                 }
 356         }
 357         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 358         return found_request;
 359 }
 360
 361 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
 362 {
 363         int ret;
 364
 365         ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
 366         if (ret) {
 367                 ret = -EINVAL;
 368                 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
 369                         __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
 370         } else {
 371                 ret = nlmsg_request->err_code;
 372         }
 373         kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
 374         return ret;
 375 }
 376
 377 int iwpm_get_nlmsg_seq(void)
 378 {
 379         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
 380 }
 381
 382 int iwpm_valid_client(u8 nl_client)
 383 {
 384         return iwpm_admin.client_list[nl_client];
 385 }
 386
 387 void iwpm_set_valid(u8 nl_client, int valid)
 388 {
 389         iwpm_admin.client_list[nl_client] = valid;
 390 }
 391
 392 /* valid client */
 393 u32 iwpm_get_registration(u8 nl_client)
 394 {
 395         return iwpm_admin.reg_list[nl_client];
 396 }
 397
 398 /* valid client */
 399 void iwpm_set_registration(u8 nl_client, u32 reg)
 400 {
 401         iwpm_admin.reg_list[nl_client] = reg;
 402 }
 403
 404 /* valid client */
 405 u32 iwpm_check_registration(u8 nl_client, u32 reg)
 406 {
 407         return (iwpm_get_registration(nl_client) & reg);
 408 }
 409
 410 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 411                                 struct sockaddr_storage *b_sockaddr)
 412 {
 413         if (a_sockaddr->ss_family != b_sockaddr->ss_family)
 414                 return 1;
 415         if (a_sockaddr->ss_family == AF_INET) {
 416                 struct sockaddr_in *a4_sockaddr =
 417                         (struct sockaddr_in *)a_sockaddr;
 418                 struct sockaddr_in *b4_sockaddr =
 419                         (struct sockaddr_in *)b_sockaddr;
 420                 if (!memcmp(&a4_sockaddr->sin_addr,
 421                         &b4_sockaddr->sin_addr, sizeof(struct in_addr))
 422                         && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
 423                                 return 0;
 424
 425         } else if (a_sockaddr->ss_family == AF_INET6) {
 426                 struct sockaddr_in6 *a6_sockaddr =
 427                         (struct sockaddr_in6 *)a_sockaddr;
 428                 struct sockaddr_in6 *b6_sockaddr =
 429                         (struct sockaddr_in6 *)b_sockaddr;
 430                 if (!memcmp(&a6_sockaddr->sin6_addr,
 431                         &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
 432                         && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
 433                                 return 0;
 434
 435         } else {
 436                 pr_err("%s: Invalid sockaddr family\n", __func__);
 437         }
 438         return 1;
 439 }
 440
 441 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 442                                                 int nl_client)
 443 {
 444         struct sk_buff *skb = NULL;
 445
 446         skb = dev_alloc_skb(IWPM_MSG_SIZE);
 447         if (!skb)
 448                 goto create_nlmsg_exit;
 449
 450         if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
 451                            NLM_F_REQUEST))) {
 452                 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
 453                 dev_kfree_skb(skb);
 454                 skb = NULL;
 455         }
 456 create_nlmsg_exit:
 457         return skb;
 458 }
 459
 460 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 461                                    const struct nla_policy *nlmsg_policy,
 462                                    struct nlattr *nltb[], const char *msg_type)
 463 {
 464         int nlh_len = 0;
 465         int ret;
 466         const char *err_str = "";
 467
 468         ret = nlmsg_validate(cb->nlh, nlh_len, policy_max - 1, nlmsg_policy,
 469                              NULL);
 470         if (ret) {
 471                 err_str = "Invalid attribute";
 472                 goto parse_nlmsg_error;
 473         }
 474         ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max - 1,
 475                           nlmsg_policy, NULL);
 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
 605         nlmsg_end(skb, nlh);
 606
 607         ret = rdma_nl_unicast(skb, iwpm_pid);
 608         if (ret) {
 609                 skb = NULL;
 610                 err_str = "Unable to send a nlmsg";
 611                 goto mapinfo_num_error;
 612         }
 613         pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
 614         return 0;
 615 mapinfo_num_error:
 616         pr_info("%s: %s\n", __func__, err_str);
 617         if (skb)
 618                 dev_kfree_skb(skb);
 619         return ret;
 620 }
 621
 622 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
 623 {
 624         struct nlmsghdr *nlh = NULL;
 625         int ret = 0;
 626
 627         if (!skb)
 628                 return ret;
 629         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 630                            RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 631                 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
 632                 dev_kfree_skb(skb);
 633                 return -ENOMEM;
 634         }
 635         nlh->nlmsg_type = NLMSG_DONE;
 636         ret = rdma_nl_unicast(skb, iwpm_pid);
 637         if (ret)
 638                 pr_warn("%s Unable to send a nlmsg\n", __func__);
 639         return ret;
 640 }
 641
 642 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
 643 {
 644         struct iwpm_mapping_info *map_info;
 645         struct sk_buff *skb = NULL;
 646         struct nlmsghdr *nlh;
 647         int skb_num = 0, mapping_num = 0;
 648         int i = 0, nlmsg_bytes = 0;
 649         unsigned long flags;
 650         const char *err_str = "";
 651         int ret;
 652
 653         skb = dev_alloc_skb(NLMSG_GOODSIZE);
 654         if (!skb) {
 655                 ret = -ENOMEM;
 656                 err_str = "Unable to allocate skb";
 657                 goto send_mapping_info_exit;
 658         }
 659         skb_num++;
 660         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 661         ret = -EINVAL;
 662         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 663                 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
 664                                      hlist_node) {
 665                         if (map_info->nl_client != nl_client)
 666                                 continue;
 667                         nlh = NULL;
 668                         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 669                                         RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 670                                 ret = -ENOMEM;
 671                                 err_str = "Unable to put the nlmsg header";
 672                                 goto send_mapping_info_unlock;
 673                         }
 674                         err_str = "Unable to put attribute of the nlmsg";
 675                         ret = ibnl_put_attr(skb, nlh,
 676                                         sizeof(struct sockaddr_storage),
 677                                         &map_info->local_sockaddr,
 678                                         IWPM_NLA_MAPINFO_LOCAL_ADDR);
 679                         if (ret)
 680                                 goto send_mapping_info_unlock;
 681
 682                         ret = ibnl_put_attr(skb, nlh,
 683                                         sizeof(struct sockaddr_storage),
 684                                         &map_info->mapped_sockaddr,
 685                                         IWPM_NLA_MAPINFO_MAPPED_ADDR);
 686                         if (ret)
 687                                 goto send_mapping_info_unlock;
 688
 689                         nlmsg_end(skb, nlh);
 690
 691                         iwpm_print_sockaddr(&map_info->local_sockaddr,
 692                                 "send_mapping_info: Local sockaddr:");
 693                         iwpm_print_sockaddr(&map_info->mapped_sockaddr,
 694                                 "send_mapping_info: Mapped local sockaddr:");
 695                         mapping_num++;
 696                         nlmsg_bytes += nlh->nlmsg_len;
 697
 698                         /* check if all mappings can fit in one skb */
 699                         if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
 700                                 /* and leave room for NLMSG_DONE */
 701                                 nlmsg_bytes = 0;
 702                                 skb_num++;
 703                                 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
 704                                                        flags);
 705                                 /* send the skb */
 706                                 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
 707                                 skb = NULL;
 708                                 if (ret) {
 709                                         err_str = "Unable to send map info";
 710                                         goto send_mapping_info_exit;
 711                                 }
 712                                 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
 713                                         ret = -ENOMEM;
 714                                         err_str = "Insufficient skbs for map info";
 715                                         goto send_mapping_info_exit;
 716                                 }
 717                                 skb = dev_alloc_skb(NLMSG_GOODSIZE);
 718                                 if (!skb) {
 719                                         ret = -ENOMEM;
 720                                         err_str = "Unable to allocate skb";
 721                                         goto send_mapping_info_exit;
 722                                 }
 723                                 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 724                         }
 725                 }
 726         }
 727 send_mapping_info_unlock:
 728         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 729 send_mapping_info_exit:
 730         if (ret) {
 731                 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
 732                 if (skb)
 733                         dev_kfree_skb(skb);
 734                 return ret;
 735         }
 736         send_nlmsg_done(skb, nl_client, iwpm_pid);
 737         return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
 738 }
 739
 740 int iwpm_mapinfo_available(void)
 741 {
 742         unsigned long flags;
 743         int full_bucket = 0, i = 0;
 744
 745         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 746         if (iwpm_hash_bucket) {
 747                 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 748                         if (!hlist_empty(&iwpm_hash_bucket[i])) {
 749                                 full_bucket = 1;
 750                                 break;
 751                         }
 752                 }
 753         }
 754         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 755         return full_bucket;
 756 }