drivers/infiniband/core/iwpm_util.c

   1 /*
   2  * Copyright (c) 2014 Chelsio, Inc. All rights reserved.
   3  * Copyright (c) 2014 Intel Corporation. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include "iwpm_util.h"
  35
  36 #define IWPM_MAPINFO_HASH_SIZE  512
  37 #define IWPM_MAPINFO_HASH_MASK  (IWPM_MAPINFO_HASH_SIZE - 1)
  38 #define IWPM_REMINFO_HASH_SIZE  64
  39 #define IWPM_REMINFO_HASH_MASK  (IWPM_REMINFO_HASH_SIZE - 1)
  40 #define IWPM_MSG_SIZE           512
  41
  42 static LIST_HEAD(iwpm_nlmsg_req_list);
  43 static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
  44
  45 static struct hlist_head *iwpm_hash_bucket;
  46 static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
  47
  48 static struct hlist_head *iwpm_reminfo_bucket;
  49 static DEFINE_SPINLOCK(iwpm_reminfo_lock);
  50
  51 static DEFINE_MUTEX(iwpm_admin_lock);
  52 static struct iwpm_admin_data iwpm_admin;
  53
  54 int iwpm_init(u8 nl_client)
  55 {
  56         int ret = 0;
  57         if (iwpm_valid_client(nl_client))
  58                 return -EINVAL;
  59         mutex_lock(&iwpm_admin_lock);
  60         if (atomic_read(&iwpm_admin.refcount) == 0) {
  61                 iwpm_hash_bucket = kzalloc(IWPM_MAPINFO_HASH_SIZE *
  62                                         sizeof(struct hlist_head), GFP_KERNEL);
  63                 if (!iwpm_hash_bucket) {
  64                         ret = -ENOMEM;
  65                         pr_err("%s Unable to create mapinfo hash table\n", __func__);
  66                         goto init_exit;
  67                 }
  68                 iwpm_reminfo_bucket = kzalloc(IWPM_REMINFO_HASH_SIZE *
  69                                         sizeof(struct hlist_head), GFP_KERNEL);
  70                 if (!iwpm_reminfo_bucket) {
  71                         kfree(iwpm_hash_bucket);
  72                         ret = -ENOMEM;
  73                         pr_err("%s Unable to create reminfo hash table\n", __func__);
  74                         goto init_exit;
  75                 }
  76         }
  77         atomic_inc(&iwpm_admin.refcount);
  78 init_exit:
  79         mutex_unlock(&iwpm_admin_lock);
  80         if (!ret) {
  81                 iwpm_set_valid(nl_client, 1);
  82                 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
  83                 pr_debug("%s: Mapinfo and reminfo tables are created\n",
  84                                 __func__);
  85         }
  86         return ret;
  87 }
  88 EXPORT_SYMBOL(iwpm_init);
  89
  90 static void free_hash_bucket(void);
  91 static void free_reminfo_bucket(void);
  92
  93 int iwpm_exit(u8 nl_client)
  94 {
  95
  96         if (!iwpm_valid_client(nl_client))
  97                 return -EINVAL;
  98         mutex_lock(&iwpm_admin_lock);
  99         if (atomic_read(&iwpm_admin.refcount) == 0) {
 100                 mutex_unlock(&iwpm_admin_lock);
 101                 pr_err("%s Incorrect usage - negative refcount\n", __func__);
 102                 return -EINVAL;
 103         }
 104         if (atomic_dec_and_test(&iwpm_admin.refcount)) {
 105                 free_hash_bucket();
 106                 free_reminfo_bucket();
 107                 pr_debug("%s: Resources are destroyed\n", __func__);
 108         }
 109         mutex_unlock(&iwpm_admin_lock);
 110         iwpm_set_valid(nl_client, 0);
 111         iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
 112         return 0;
 113 }
 114 EXPORT_SYMBOL(iwpm_exit);
 115
 116 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
 117                                                struct sockaddr_storage *);
 118
 119 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
 120                         struct sockaddr_storage *mapped_sockaddr,
 121                         u8 nl_client)
 122 {
 123         struct hlist_head *hash_bucket_head;
 124         struct iwpm_mapping_info *map_info;
 125         unsigned long flags;
 126         int ret = -EINVAL;
 127
 128         if (!iwpm_valid_client(nl_client))
 129                 return ret;
 130         map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
 131         if (!map_info) {
 132                 pr_err("%s: Unable to allocate a mapping info\n", __func__);
 133                 return -ENOMEM;
 134         }
 135         memcpy(&map_info->local_sockaddr, local_sockaddr,
 136                sizeof(struct sockaddr_storage));
 137         memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
 138                sizeof(struct sockaddr_storage));
 139         map_info->nl_client = nl_client;
 140
 141         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 142         if (iwpm_hash_bucket) {
 143                 hash_bucket_head = get_mapinfo_hash_bucket(
 144                                         &map_info->local_sockaddr,
 145                                         &map_info->mapped_sockaddr);
 146                 if (hash_bucket_head) {
 147                         hlist_add_head(&map_info->hlist_node, hash_bucket_head);
 148                         ret = 0;
 149                 }
 150         }
 151         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 152         return ret;
 153 }
 154 EXPORT_SYMBOL(iwpm_create_mapinfo);
 155
 156 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
 157                         struct sockaddr_storage *mapped_local_addr)
 158 {
 159         struct hlist_node *tmp_hlist_node;
 160         struct hlist_head *hash_bucket_head;
 161         struct iwpm_mapping_info *map_info = NULL;
 162         unsigned long flags;
 163         int ret = -EINVAL;
 164
 165         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 166         if (iwpm_hash_bucket) {
 167                 hash_bucket_head = get_mapinfo_hash_bucket(
 168                                         local_sockaddr,
 169                                         mapped_local_addr);
 170                 if (!hash_bucket_head)
 171                         goto remove_mapinfo_exit;
 172
 173                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 174                                         hash_bucket_head, hlist_node) {
 175
 176                         if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
 177                                                 mapped_local_addr)) {
 178
 179                                 hlist_del_init(&map_info->hlist_node);
 180                                 kfree(map_info);
 181                                 ret = 0;
 182                                 break;
 183                         }
 184                 }
 185         }
 186 remove_mapinfo_exit:
 187         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 188         return ret;
 189 }
 190 EXPORT_SYMBOL(iwpm_remove_mapinfo);
 191
 192 static void free_hash_bucket(void)
 193 {
 194         struct hlist_node *tmp_hlist_node;
 195         struct iwpm_mapping_info *map_info;
 196         unsigned long flags;
 197         int i;
 198
 199         /* remove all the mapinfo data from the list */
 200         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 201         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 202                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 203                         &iwpm_hash_bucket[i], hlist_node) {
 204
 205                                 hlist_del_init(&map_info->hlist_node);
 206                                 kfree(map_info);
 207                         }
 208         }
 209         /* free the hash list */
 210         kfree(iwpm_hash_bucket);
 211         iwpm_hash_bucket = NULL;
 212         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 213 }
 214
 215 static void free_reminfo_bucket(void)
 216 {
 217         struct hlist_node *tmp_hlist_node;
 218         struct iwpm_remote_info *rem_info;
 219         unsigned long flags;
 220         int i;
 221
 222         /* remove all the remote info from the list */
 223         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 224         for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
 225                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 226                         &iwpm_reminfo_bucket[i], hlist_node) {
 227
 228                                 hlist_del_init(&rem_info->hlist_node);
 229                                 kfree(rem_info);
 230                         }
 231         }
 232         /* free the hash list */
 233         kfree(iwpm_reminfo_bucket);
 234         iwpm_reminfo_bucket = NULL;
 235         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 236 }
 237
 238 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
 239                                                 struct sockaddr_storage *);
 240
 241 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
 242 {
 243         struct hlist_head *hash_bucket_head;
 244         unsigned long flags;
 245
 246         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 247         if (iwpm_reminfo_bucket) {
 248                 hash_bucket_head = get_reminfo_hash_bucket(
 249                                         &rem_info->mapped_loc_sockaddr,
 250                                         &rem_info->mapped_rem_sockaddr);
 251                 if (hash_bucket_head)
 252                         hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
 253         }
 254         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 255 }
 256
 257 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
 258                          struct sockaddr_storage *mapped_rem_addr,
 259                          struct sockaddr_storage *remote_addr,
 260                          u8 nl_client)
 261 {
 262         struct hlist_node *tmp_hlist_node;
 263         struct hlist_head *hash_bucket_head;
 264         struct iwpm_remote_info *rem_info = NULL;
 265         unsigned long flags;
 266         int ret = -EINVAL;
 267
 268         if (!iwpm_valid_client(nl_client)) {
 269                 pr_info("%s: Invalid client = %d\n", __func__, nl_client);
 270                 return ret;
 271         }
 272         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 273         if (iwpm_reminfo_bucket) {
 274                 hash_bucket_head = get_reminfo_hash_bucket(
 275                                         mapped_loc_addr,
 276                                         mapped_rem_addr);
 277                 if (!hash_bucket_head)
 278                         goto get_remote_info_exit;
 279                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 280                                         hash_bucket_head, hlist_node) {
 281
 282                         if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
 283                                 mapped_loc_addr) &&
 284                                 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
 285                                 mapped_rem_addr)) {
 286
 287                                 memcpy(remote_addr, &rem_info->remote_sockaddr,
 288                                         sizeof(struct sockaddr_storage));
 289                                 iwpm_print_sockaddr(remote_addr,
 290                                                 "get_remote_info: Remote sockaddr:");
 291
 292                                 hlist_del_init(&rem_info->hlist_node);
 293                                 kfree(rem_info);
 294                                 ret = 0;
 295                                 break;
 296                         }
 297                 }
 298         }
 299 get_remote_info_exit:
 300         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 301         return ret;
 302 }
 303 EXPORT_SYMBOL(iwpm_get_remote_info);
 304
 305 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
 306                                         u8 nl_client, gfp_t gfp)
 307 {
 308         struct iwpm_nlmsg_request *nlmsg_request = NULL;
 309         unsigned long flags;
 310
 311         nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
 312         if (!nlmsg_request) {
 313                 pr_err("%s Unable to allocate a nlmsg_request\n", __func__);
 314                 return NULL;
 315         }
 316         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 317         list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
 318         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 319
 320         kref_init(&nlmsg_request->kref);
 321         kref_get(&nlmsg_request->kref);
 322         nlmsg_request->nlmsg_seq = nlmsg_seq;
 323         nlmsg_request->nl_client = nl_client;
 324         nlmsg_request->request_done = 0;
 325         nlmsg_request->err_code = 0;
 326         sema_init(&nlmsg_request->sem, 1);
 327         down(&nlmsg_request->sem);
 328         return nlmsg_request;
 329 }
 330
 331 void iwpm_free_nlmsg_request(struct kref *kref)
 332 {
 333         struct iwpm_nlmsg_request *nlmsg_request;
 334         unsigned long flags;
 335
 336         nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
 337
 338         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 339         list_del_init(&nlmsg_request->inprocess_list);
 340         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 341
 342         if (!nlmsg_request->request_done)
 343                 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
 344                         __func__, nlmsg_request->nlmsg_seq);
 345         kfree(nlmsg_request);
 346 }
 347
 348 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
 349 {
 350         struct iwpm_nlmsg_request *nlmsg_request;
 351         struct iwpm_nlmsg_request *found_request = NULL;
 352         unsigned long flags;
 353
 354         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 355         list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
 356                             inprocess_list) {
 357                 if (nlmsg_request->nlmsg_seq == echo_seq) {
 358                         found_request = nlmsg_request;
 359                         kref_get(&nlmsg_request->kref);
 360                         break;
 361                 }
 362         }
 363         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 364         return found_request;
 365 }
 366
 367 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
 368 {
 369         int ret;
 370
 371         ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
 372         if (ret) {
 373                 ret = -EINVAL;
 374                 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
 375                         __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
 376         } else {
 377                 ret = nlmsg_request->err_code;
 378         }
 379         kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
 380         return ret;
 381 }
 382
 383 int iwpm_get_nlmsg_seq(void)
 384 {
 385         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
 386 }
 387
 388 int iwpm_valid_client(u8 nl_client)
 389 {
 390         if (nl_client >= RDMA_NL_NUM_CLIENTS)
 391                 return 0;
 392         return iwpm_admin.client_list[nl_client];
 393 }
 394
 395 void iwpm_set_valid(u8 nl_client, int valid)
 396 {
 397         if (nl_client >= RDMA_NL_NUM_CLIENTS)
 398                 return;
 399         iwpm_admin.client_list[nl_client] = valid;
 400 }
 401
 402 /* valid client */
 403 u32 iwpm_get_registration(u8 nl_client)
 404 {
 405         return iwpm_admin.reg_list[nl_client];
 406 }
 407
 408 /* valid client */
 409 void iwpm_set_registration(u8 nl_client, u32 reg)
 410 {
 411         iwpm_admin.reg_list[nl_client] = reg;
 412 }
 413
 414 /* valid client */
 415 u32 iwpm_check_registration(u8 nl_client, u32 reg)
 416 {
 417         return (iwpm_get_registration(nl_client) & reg);
 418 }
 419
 420 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 421                                 struct sockaddr_storage *b_sockaddr)
 422 {
 423         if (a_sockaddr->ss_family != b_sockaddr->ss_family)
 424                 return 1;
 425         if (a_sockaddr->ss_family == AF_INET) {
 426                 struct sockaddr_in *a4_sockaddr =
 427                         (struct sockaddr_in *)a_sockaddr;
 428                 struct sockaddr_in *b4_sockaddr =
 429                         (struct sockaddr_in *)b_sockaddr;
 430                 if (!memcmp(&a4_sockaddr->sin_addr,
 431                         &b4_sockaddr->sin_addr, sizeof(struct in_addr))
 432                         && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
 433                                 return 0;
 434
 435         } else if (a_sockaddr->ss_family == AF_INET6) {
 436                 struct sockaddr_in6 *a6_sockaddr =
 437                         (struct sockaddr_in6 *)a_sockaddr;
 438                 struct sockaddr_in6 *b6_sockaddr =
 439                         (struct sockaddr_in6 *)b_sockaddr;
 440                 if (!memcmp(&a6_sockaddr->sin6_addr,
 441                         &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
 442                         && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
 443                                 return 0;
 444
 445         } else {
 446                 pr_err("%s: Invalid sockaddr family\n", __func__);
 447         }
 448         return 1;
 449 }
 450
 451 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 452                                                 int nl_client)
 453 {
 454         struct sk_buff *skb = NULL;
 455
 456         skb = dev_alloc_skb(IWPM_MSG_SIZE);
 457         if (!skb) {
 458                 pr_err("%s Unable to allocate skb\n", __func__);
 459                 goto create_nlmsg_exit;
 460         }
 461         if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
 462                            NLM_F_REQUEST))) {
 463                 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
 464                 dev_kfree_skb(skb);
 465                 skb = NULL;
 466         }
 467 create_nlmsg_exit:
 468         return skb;
 469 }
 470
 471 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 472                                    const struct nla_policy *nlmsg_policy,
 473                                    struct nlattr *nltb[], const char *msg_type)
 474 {
 475         int nlh_len = 0;
 476         int ret;
 477         const char *err_str = "";
 478
 479         ret = nlmsg_validate(cb->nlh, nlh_len, policy_max-1, nlmsg_policy);
 480         if (ret) {
 481                 err_str = "Invalid attribute";
 482                 goto parse_nlmsg_error;
 483         }
 484         ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max-1, nlmsg_policy);
 485         if (ret) {
 486                 err_str = "Unable to parse the nlmsg";
 487                 goto parse_nlmsg_error;
 488         }
 489         ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
 490         if (ret) {
 491                 err_str = "Invalid NULL attribute";
 492                 goto parse_nlmsg_error;
 493         }
 494         return 0;
 495 parse_nlmsg_error:
 496         pr_warn("%s: %s (msg type %s ret = %d)\n",
 497                         __func__, err_str, msg_type, ret);
 498         return ret;
 499 }
 500
 501 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
 502 {
 503         struct sockaddr_in6 *sockaddr_v6;
 504         struct sockaddr_in *sockaddr_v4;
 505
 506         switch (sockaddr->ss_family) {
 507         case AF_INET:
 508                 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
 509                 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
 510                         msg, &sockaddr_v4->sin_addr,
 511                         ntohs(sockaddr_v4->sin_port),
 512                         ntohs(sockaddr_v4->sin_port));
 513                 break;
 514         case AF_INET6:
 515                 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
 516                 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
 517                         msg, &sockaddr_v6->sin6_addr,
 518                         ntohs(sockaddr_v6->sin6_port),
 519                         ntohs(sockaddr_v6->sin6_port));
 520                 break;
 521         default:
 522                 break;
 523         }
 524 }
 525
 526 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
 527 {
 528         u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
 529         u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
 530         return hash;
 531 }
 532
 533 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
 534 {
 535         u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
 536         u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
 537         return hash;
 538 }
 539
 540 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
 541                                 struct sockaddr_storage *b_sockaddr, u32 *hash)
 542 {
 543         u32 a_hash, b_hash;
 544
 545         if (a_sockaddr->ss_family == AF_INET) {
 546                 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
 547                 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
 548
 549         } else if (a_sockaddr->ss_family == AF_INET6) {
 550                 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
 551                 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
 552         } else {
 553                 pr_err("%s: Invalid sockaddr family\n", __func__);
 554                 return -EINVAL;
 555         }
 556
 557         if (a_hash == b_hash) /* if port mapper isn't available */
 558                 *hash = a_hash;
 559         else
 560                 *hash = jhash_2words(a_hash, b_hash, 0);
 561         return 0;
 562 }
 563
 564 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
 565                                 *local_sockaddr, struct sockaddr_storage
 566                                 *mapped_sockaddr)
 567 {
 568         u32 hash;
 569         int ret;
 570
 571         ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
 572         if (ret)
 573                 return NULL;
 574         return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
 575 }
 576
 577 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
 578                                 *mapped_loc_sockaddr, struct sockaddr_storage
 579                                 *mapped_rem_sockaddr)
 580 {
 581         u32 hash;
 582         int ret;
 583
 584         ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
 585         if (ret)
 586                 return NULL;
 587         return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
 588 }
 589
 590 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
 591 {
 592         struct sk_buff *skb = NULL;
 593         struct nlmsghdr *nlh;
 594         u32 msg_seq;
 595         const char *err_str = "";
 596         int ret = -EINVAL;
 597
 598         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
 599         if (!skb) {
 600                 err_str = "Unable to create a nlmsg";
 601                 goto mapinfo_num_error;
 602         }
 603         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 604         msg_seq = 0;
 605         err_str = "Unable to put attribute of mapinfo number nlmsg";
 606         ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
 607         if (ret)
 608                 goto mapinfo_num_error;
 609         ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 610                                 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
 611         if (ret)
 612                 goto mapinfo_num_error;
 613         ret = ibnl_unicast(skb, nlh, iwpm_pid);
 614         if (ret) {
 615                 skb = NULL;
 616                 err_str = "Unable to send a nlmsg";
 617                 goto mapinfo_num_error;
 618         }
 619         pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
 620         return 0;
 621 mapinfo_num_error:
 622         pr_info("%s: %s\n", __func__, err_str);
 623         if (skb)
 624                 dev_kfree_skb(skb);
 625         return ret;
 626 }
 627
 628 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
 629 {
 630         struct nlmsghdr *nlh = NULL;
 631         int ret = 0;
 632
 633         if (!skb)
 634                 return ret;
 635         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 636                            RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 637                 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
 638                 dev_kfree_skb(skb);
 639                 return -ENOMEM;
 640         }
 641         nlh->nlmsg_type = NLMSG_DONE;
 642         ret = ibnl_unicast(skb, (struct nlmsghdr *)skb->data, iwpm_pid);
 643         if (ret)
 644                 pr_warn("%s Unable to send a nlmsg\n", __func__);
 645         return ret;
 646 }
 647
 648 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
 649 {
 650         struct iwpm_mapping_info *map_info;
 651         struct sk_buff *skb = NULL;
 652         struct nlmsghdr *nlh;
 653         int skb_num = 0, mapping_num = 0;
 654         int i = 0, nlmsg_bytes = 0;
 655         unsigned long flags;
 656         const char *err_str = "";
 657         int ret;
 658
 659         skb = dev_alloc_skb(NLMSG_GOODSIZE);
 660         if (!skb) {
 661                 ret = -ENOMEM;
 662                 err_str = "Unable to allocate skb";
 663                 goto send_mapping_info_exit;
 664         }
 665         skb_num++;
 666         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 667         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 668                 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
 669                                      hlist_node) {
 670                         if (map_info->nl_client != nl_client)
 671                                 continue;
 672                         nlh = NULL;
 673                         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 674                                         RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 675                                 ret = -ENOMEM;
 676                                 err_str = "Unable to put the nlmsg header";
 677                                 goto send_mapping_info_unlock;
 678                         }
 679                         err_str = "Unable to put attribute of the nlmsg";
 680                         ret = ibnl_put_attr(skb, nlh,
 681                                         sizeof(struct sockaddr_storage),
 682                                         &map_info->local_sockaddr,
 683                                         IWPM_NLA_MAPINFO_LOCAL_ADDR);
 684                         if (ret)
 685                                 goto send_mapping_info_unlock;
 686
 687                         ret = ibnl_put_attr(skb, nlh,
 688                                         sizeof(struct sockaddr_storage),
 689                                         &map_info->mapped_sockaddr,
 690                                         IWPM_NLA_MAPINFO_MAPPED_ADDR);
 691                         if (ret)
 692                                 goto send_mapping_info_unlock;
 693
 694                         iwpm_print_sockaddr(&map_info->local_sockaddr,
 695                                 "send_mapping_info: Local sockaddr:");
 696                         iwpm_print_sockaddr(&map_info->mapped_sockaddr,
 697                                 "send_mapping_info: Mapped local sockaddr:");
 698                         mapping_num++;
 699                         nlmsg_bytes += nlh->nlmsg_len;
 700
 701                         /* check if all mappings can fit in one skb */
 702                         if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
 703                                 /* and leave room for NLMSG_DONE */
 704                                 nlmsg_bytes = 0;
 705                                 skb_num++;
 706                                 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
 707                                                        flags);
 708                                 /* send the skb */
 709                                 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
 710                                 skb = NULL;
 711                                 if (ret) {
 712                                         err_str = "Unable to send map info";
 713                                         goto send_mapping_info_exit;
 714                                 }
 715                                 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
 716                                         ret = -ENOMEM;
 717                                         err_str = "Insufficient skbs for map info";
 718                                         goto send_mapping_info_exit;
 719                                 }
 720                                 skb = dev_alloc_skb(NLMSG_GOODSIZE);
 721                                 if (!skb) {
 722                                         ret = -ENOMEM;
 723                                         err_str = "Unable to allocate skb";
 724                                         goto send_mapping_info_exit;
 725                                 }
 726                                 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 727                         }
 728                 }
 729         }
 730 send_mapping_info_unlock:
 731         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 732 send_mapping_info_exit:
 733         if (ret) {
 734                 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
 735                 if (skb)
 736                         dev_kfree_skb(skb);
 737                 return ret;
 738         }
 739         send_nlmsg_done(skb, nl_client, iwpm_pid);
 740         return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
 741 }
 742
 743 int iwpm_mapinfo_available(void)
 744 {
 745         unsigned long flags;
 746         int full_bucket = 0, i = 0;
 747
 748         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 749         if (iwpm_hash_bucket) {
 750                 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 751                         if (!hlist_empty(&iwpm_hash_bucket[i])) {
 752                                 full_bucket = 1;
 753                                 break;
 754                         }
 755                 }
 756         }
 757         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 758         return full_bucket;
 759 }