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 = NULL;
 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
 146         if (!hash_bucket_head)
 147                 kfree(map_info);
 148         return ret;
 149 }
 150
 151 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
 152                         struct sockaddr_storage *mapped_local_addr)
 153 {
 154         struct hlist_node *tmp_hlist_node;
 155         struct hlist_head *hash_bucket_head;
 156         struct iwpm_mapping_info *map_info = NULL;
 157         unsigned long flags;
 158         int ret = -EINVAL;
 159
 160         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 161         if (iwpm_hash_bucket) {
 162                 hash_bucket_head = get_mapinfo_hash_bucket(
 163                                         local_sockaddr,
 164                                         mapped_local_addr);
 165                 if (!hash_bucket_head)
 166                         goto remove_mapinfo_exit;
 167
 168                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 169                                         hash_bucket_head, hlist_node) {
 170
 171                         if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
 172                                                 mapped_local_addr)) {
 173
 174                                 hlist_del_init(&map_info->hlist_node);
 175                                 kfree(map_info);
 176                                 ret = 0;
 177                                 break;
 178                         }
 179                 }
 180         }
 181 remove_mapinfo_exit:
 182         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 183         return ret;
 184 }
 185
 186 static void free_hash_bucket(void)
 187 {
 188         struct hlist_node *tmp_hlist_node;
 189         struct iwpm_mapping_info *map_info;
 190         unsigned long flags;
 191         int i;
 192
 193         /* remove all the mapinfo data from the list */
 194         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 195         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 196                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 197                         &iwpm_hash_bucket[i], hlist_node) {
 198
 199                                 hlist_del_init(&map_info->hlist_node);
 200                                 kfree(map_info);
 201                         }
 202         }
 203         /* free the hash list */
 204         kfree(iwpm_hash_bucket);
 205         iwpm_hash_bucket = NULL;
 206         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 207 }
 208
 209 static void free_reminfo_bucket(void)
 210 {
 211         struct hlist_node *tmp_hlist_node;
 212         struct iwpm_remote_info *rem_info;
 213         unsigned long flags;
 214         int i;
 215
 216         /* remove all the remote info from the list */
 217         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 218         for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
 219                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 220                         &iwpm_reminfo_bucket[i], hlist_node) {
 221
 222                                 hlist_del_init(&rem_info->hlist_node);
 223                                 kfree(rem_info);
 224                         }
 225         }
 226         /* free the hash list */
 227         kfree(iwpm_reminfo_bucket);
 228         iwpm_reminfo_bucket = NULL;
 229         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 230 }
 231
 232 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
 233                                                 struct sockaddr_storage *);
 234
 235 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
 236 {
 237         struct hlist_head *hash_bucket_head;
 238         unsigned long flags;
 239
 240         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 241         if (iwpm_reminfo_bucket) {
 242                 hash_bucket_head = get_reminfo_hash_bucket(
 243                                         &rem_info->mapped_loc_sockaddr,
 244                                         &rem_info->mapped_rem_sockaddr);
 245                 if (hash_bucket_head)
 246                         hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
 247         }
 248         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 249 }
 250
 251 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
 252                          struct sockaddr_storage *mapped_rem_addr,
 253                          struct sockaddr_storage *remote_addr,
 254                          u8 nl_client)
 255 {
 256         struct hlist_node *tmp_hlist_node;
 257         struct hlist_head *hash_bucket_head;
 258         struct iwpm_remote_info *rem_info = NULL;
 259         unsigned long flags;
 260         int ret = -EINVAL;
 261
 262         if (!iwpm_valid_client(nl_client)) {
 263                 pr_info("%s: Invalid client = %d\n", __func__, nl_client);
 264                 return ret;
 265         }
 266         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 267         if (iwpm_reminfo_bucket) {
 268                 hash_bucket_head = get_reminfo_hash_bucket(
 269                                         mapped_loc_addr,
 270                                         mapped_rem_addr);
 271                 if (!hash_bucket_head)
 272                         goto get_remote_info_exit;
 273                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 274                                         hash_bucket_head, hlist_node) {
 275
 276                         if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
 277                                 mapped_loc_addr) &&
 278                                 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
 279                                 mapped_rem_addr)) {
 280
 281                                 memcpy(remote_addr, &rem_info->remote_sockaddr,
 282                                         sizeof(struct sockaddr_storage));
 283                                 iwpm_print_sockaddr(remote_addr,
 284                                                 "get_remote_info: Remote sockaddr:");
 285
 286                                 hlist_del_init(&rem_info->hlist_node);
 287                                 kfree(rem_info);
 288                                 ret = 0;
 289                                 break;
 290                         }
 291                 }
 292         }
 293 get_remote_info_exit:
 294         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 295         return ret;
 296 }
 297
 298 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
 299                                         u8 nl_client, gfp_t gfp)
 300 {
 301         struct iwpm_nlmsg_request *nlmsg_request = NULL;
 302         unsigned long flags;
 303
 304         nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
 305         if (!nlmsg_request)
 306                 return NULL;
 307
 308         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 309         list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
 310         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 311
 312         kref_init(&nlmsg_request->kref);
 313         kref_get(&nlmsg_request->kref);
 314         nlmsg_request->nlmsg_seq = nlmsg_seq;
 315         nlmsg_request->nl_client = nl_client;
 316         nlmsg_request->request_done = 0;
 317         nlmsg_request->err_code = 0;
 318         sema_init(&nlmsg_request->sem, 1);
 319         down(&nlmsg_request->sem);
 320         return nlmsg_request;
 321 }
 322
 323 void iwpm_free_nlmsg_request(struct kref *kref)
 324 {
 325         struct iwpm_nlmsg_request *nlmsg_request;
 326         unsigned long flags;
 327
 328         nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
 329
 330         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 331         list_del_init(&nlmsg_request->inprocess_list);
 332         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 333
 334         if (!nlmsg_request->request_done)
 335                 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
 336                         __func__, nlmsg_request->nlmsg_seq);
 337         kfree(nlmsg_request);
 338 }
 339
 340 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
 341 {
 342         struct iwpm_nlmsg_request *nlmsg_request;
 343         struct iwpm_nlmsg_request *found_request = NULL;
 344         unsigned long flags;
 345
 346         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 347         list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
 348                             inprocess_list) {
 349                 if (nlmsg_request->nlmsg_seq == echo_seq) {
 350                         found_request = nlmsg_request;
 351                         kref_get(&nlmsg_request->kref);
 352                         break;
 353                 }
 354         }
 355         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 356         return found_request;
 357 }
 358
 359 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
 360 {
 361         int ret;
 362
 363         ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
 364         if (ret) {
 365                 ret = -EINVAL;
 366                 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
 367                         __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
 368         } else {
 369                 ret = nlmsg_request->err_code;
 370         }
 371         kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
 372         return ret;
 373 }
 374
 375 int iwpm_get_nlmsg_seq(void)
 376 {
 377         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
 378 }
 379
 380 int iwpm_valid_client(u8 nl_client)
 381 {
 382         return iwpm_admin.client_list[nl_client];
 383 }
 384
 385 void iwpm_set_valid(u8 nl_client, int valid)
 386 {
 387         iwpm_admin.client_list[nl_client] = valid;
 388 }
 389
 390 /* valid client */
 391 u32 iwpm_get_registration(u8 nl_client)
 392 {
 393         return iwpm_admin.reg_list[nl_client];
 394 }
 395
 396 /* valid client */
 397 void iwpm_set_registration(u8 nl_client, u32 reg)
 398 {
 399         iwpm_admin.reg_list[nl_client] = reg;
 400 }
 401
 402 /* valid client */
 403 u32 iwpm_check_registration(u8 nl_client, u32 reg)
 404 {
 405         return (iwpm_get_registration(nl_client) & reg);
 406 }
 407
 408 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 409                                 struct sockaddr_storage *b_sockaddr)
 410 {
 411         if (a_sockaddr->ss_family != b_sockaddr->ss_family)
 412                 return 1;
 413         if (a_sockaddr->ss_family == AF_INET) {
 414                 struct sockaddr_in *a4_sockaddr =
 415                         (struct sockaddr_in *)a_sockaddr;
 416                 struct sockaddr_in *b4_sockaddr =
 417                         (struct sockaddr_in *)b_sockaddr;
 418                 if (!memcmp(&a4_sockaddr->sin_addr,
 419                         &b4_sockaddr->sin_addr, sizeof(struct in_addr))
 420                         && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
 421                                 return 0;
 422
 423         } else if (a_sockaddr->ss_family == AF_INET6) {
 424                 struct sockaddr_in6 *a6_sockaddr =
 425                         (struct sockaddr_in6 *)a_sockaddr;
 426                 struct sockaddr_in6 *b6_sockaddr =
 427                         (struct sockaddr_in6 *)b_sockaddr;
 428                 if (!memcmp(&a6_sockaddr->sin6_addr,
 429                         &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
 430                         && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
 431                                 return 0;
 432
 433         } else {
 434                 pr_err("%s: Invalid sockaddr family\n", __func__);
 435         }
 436         return 1;
 437 }
 438
 439 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 440                                                 int nl_client)
 441 {
 442         struct sk_buff *skb = NULL;
 443
 444         skb = dev_alloc_skb(IWPM_MSG_SIZE);
 445         if (!skb) {
 446                 pr_err("%s Unable to allocate skb\n", __func__);
 447                 goto create_nlmsg_exit;
 448         }
 449         if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
 450                            NLM_F_REQUEST))) {
 451                 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
 452                 dev_kfree_skb(skb);
 453                 skb = NULL;
 454         }
 455 create_nlmsg_exit:
 456         return skb;
 457 }
 458
 459 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 460                                    const struct nla_policy *nlmsg_policy,
 461                                    struct nlattr *nltb[], const char *msg_type)
 462 {
 463         int nlh_len = 0;
 464         int ret;
 465         const char *err_str = "";
 466
 467         ret = nlmsg_validate(cb->nlh, nlh_len, policy_max - 1, nlmsg_policy,
 468                              NULL);
 469         if (ret) {
 470                 err_str = "Invalid attribute";
 471                 goto parse_nlmsg_error;
 472         }
 473         ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max - 1,
 474                           nlmsg_policy, NULL);
 475         if (ret) {
 476                 err_str = "Unable to parse the nlmsg";
 477                 goto parse_nlmsg_error;
 478         }
 479         ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
 480         if (ret) {
 481                 err_str = "Invalid NULL attribute";
 482                 goto parse_nlmsg_error;
 483         }
 484         return 0;
 485 parse_nlmsg_error:
 486         pr_warn("%s: %s (msg type %s ret = %d)\n",
 487                         __func__, err_str, msg_type, ret);
 488         return ret;
 489 }
 490
 491 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
 492 {
 493         struct sockaddr_in6 *sockaddr_v6;
 494         struct sockaddr_in *sockaddr_v4;
 495
 496         switch (sockaddr->ss_family) {
 497         case AF_INET:
 498                 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
 499                 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
 500                         msg, &sockaddr_v4->sin_addr,
 501                         ntohs(sockaddr_v4->sin_port),
 502                         ntohs(sockaddr_v4->sin_port));
 503                 break;
 504         case AF_INET6:
 505                 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
 506                 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
 507                         msg, &sockaddr_v6->sin6_addr,
 508                         ntohs(sockaddr_v6->sin6_port),
 509                         ntohs(sockaddr_v6->sin6_port));
 510                 break;
 511         default:
 512                 break;
 513         }
 514 }
 515
 516 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
 517 {
 518         u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
 519         u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
 520         return hash;
 521 }
 522
 523 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
 524 {
 525         u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
 526         u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
 527         return hash;
 528 }
 529
 530 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
 531                                 struct sockaddr_storage *b_sockaddr, u32 *hash)
 532 {
 533         u32 a_hash, b_hash;
 534
 535         if (a_sockaddr->ss_family == AF_INET) {
 536                 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
 537                 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
 538
 539         } else if (a_sockaddr->ss_family == AF_INET6) {
 540                 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
 541                 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
 542         } else {
 543                 pr_err("%s: Invalid sockaddr family\n", __func__);
 544                 return -EINVAL;
 545         }
 546
 547         if (a_hash == b_hash) /* if port mapper isn't available */
 548                 *hash = a_hash;
 549         else
 550                 *hash = jhash_2words(a_hash, b_hash, 0);
 551         return 0;
 552 }
 553
 554 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
 555                                 *local_sockaddr, struct sockaddr_storage
 556                                 *mapped_sockaddr)
 557 {
 558         u32 hash;
 559         int ret;
 560
 561         ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
 562         if (ret)
 563                 return NULL;
 564         return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
 565 }
 566
 567 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
 568                                 *mapped_loc_sockaddr, struct sockaddr_storage
 569                                 *mapped_rem_sockaddr)
 570 {
 571         u32 hash;
 572         int ret;
 573
 574         ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
 575         if (ret)
 576                 return NULL;
 577         return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
 578 }
 579
 580 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
 581 {
 582         struct sk_buff *skb = NULL;
 583         struct nlmsghdr *nlh;
 584         u32 msg_seq;
 585         const char *err_str = "";
 586         int ret = -EINVAL;
 587
 588         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
 589         if (!skb) {
 590                 err_str = "Unable to create a nlmsg";
 591                 goto mapinfo_num_error;
 592         }
 593         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 594         msg_seq = 0;
 595         err_str = "Unable to put attribute of mapinfo number nlmsg";
 596         ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
 597         if (ret)
 598                 goto mapinfo_num_error;
 599         ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 600                                 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
 601         if (ret)
 602                 goto mapinfo_num_error;
 603
 604         nlmsg_end(skb, nlh);
 605
 606         ret = rdma_nl_unicast(skb, iwpm_pid);
 607         if (ret) {
 608                 skb = NULL;
 609                 err_str = "Unable to send a nlmsg";
 610                 goto mapinfo_num_error;
 611         }
 612         pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
 613         return 0;
 614 mapinfo_num_error:
 615         pr_info("%s: %s\n", __func__, err_str);
 616         if (skb)
 617                 dev_kfree_skb(skb);
 618         return ret;
 619 }
 620
 621 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
 622 {
 623         struct nlmsghdr *nlh = NULL;
 624         int ret = 0;
 625
 626         if (!skb)
 627                 return ret;
 628         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 629                            RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 630                 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
 631                 dev_kfree_skb(skb);
 632                 return -ENOMEM;
 633         }
 634         nlh->nlmsg_type = NLMSG_DONE;
 635         ret = rdma_nl_unicast(skb, iwpm_pid);
 636         if (ret)
 637                 pr_warn("%s Unable to send a nlmsg\n", __func__);
 638         return ret;
 639 }
 640
 641 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
 642 {
 643         struct iwpm_mapping_info *map_info;
 644         struct sk_buff *skb = NULL;
 645         struct nlmsghdr *nlh;
 646         int skb_num = 0, mapping_num = 0;
 647         int i = 0, nlmsg_bytes = 0;
 648         unsigned long flags;
 649         const char *err_str = "";
 650         int ret;
 651
 652         skb = dev_alloc_skb(NLMSG_GOODSIZE);
 653         if (!skb) {
 654                 ret = -ENOMEM;
 655                 err_str = "Unable to allocate skb";
 656                 goto send_mapping_info_exit;
 657         }
 658         skb_num++;
 659         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 660         ret = -EINVAL;
 661         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 662                 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
 663                                      hlist_node) {
 664                         if (map_info->nl_client != nl_client)
 665                                 continue;
 666                         nlh = NULL;
 667                         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 668                                         RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 669                                 ret = -ENOMEM;
 670                                 err_str = "Unable to put the nlmsg header";
 671                                 goto send_mapping_info_unlock;
 672                         }
 673                         err_str = "Unable to put attribute of the nlmsg";
 674                         ret = ibnl_put_attr(skb, nlh,
 675                                         sizeof(struct sockaddr_storage),
 676                                         &map_info->local_sockaddr,
 677                                         IWPM_NLA_MAPINFO_LOCAL_ADDR);
 678                         if (ret)
 679                                 goto send_mapping_info_unlock;
 680
 681                         ret = ibnl_put_attr(skb, nlh,
 682                                         sizeof(struct sockaddr_storage),
 683                                         &map_info->mapped_sockaddr,
 684                                         IWPM_NLA_MAPINFO_MAPPED_ADDR);
 685                         if (ret)
 686                                 goto send_mapping_info_unlock;
 687
 688                         nlmsg_end(skb, nlh);
 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 }