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 /**
  55  * iwpm_init - Allocate resources for the iwarp port mapper
  56  * @nl_client: The index of the netlink client
  57  *
  58  * Should be called when network interface goes up.
  59  */
  60 int iwpm_init(u8 nl_client)
  61 {
  62         int ret = 0;
  63         mutex_lock(&iwpm_admin_lock);
  64         if (!refcount_read(&iwpm_admin.refcount)) {
  65                 iwpm_hash_bucket = kcalloc(IWPM_MAPINFO_HASH_SIZE,
  66                                            sizeof(struct hlist_head),
  67                                            GFP_KERNEL);
  68                 if (!iwpm_hash_bucket) {
  69                         ret = -ENOMEM;
  70                         goto init_exit;
  71                 }
  72                 iwpm_reminfo_bucket = kcalloc(IWPM_REMINFO_HASH_SIZE,
  73                                               sizeof(struct hlist_head),
  74                                               GFP_KERNEL);
  75                 if (!iwpm_reminfo_bucket) {
  76                         kfree(iwpm_hash_bucket);
  77                         ret = -ENOMEM;
  78                         goto init_exit;
  79                 }
  80
  81                 refcount_set(&iwpm_admin.refcount, 1);
  82         } else {
  83                 refcount_inc(&iwpm_admin.refcount);
  84         }
  85
  86 init_exit:
  87         mutex_unlock(&iwpm_admin_lock);
  88         if (!ret) {
  89                 iwpm_set_valid(nl_client, 1);
  90                 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
  91                 pr_debug("%s: Mapinfo and reminfo tables are created\n",
  92                                 __func__);
  93         }
  94         return ret;
  95 }
  96
  97 static void free_hash_bucket(void);
  98 static void free_reminfo_bucket(void);
  99
 100 /**
 101  * iwpm_exit - Deallocate resources for the iwarp port mapper
 102  * @nl_client: The index of the netlink client
 103  *
 104  * Should be called when network interface goes down.
 105  */
 106 int iwpm_exit(u8 nl_client)
 107 {
 108
 109         if (!iwpm_valid_client(nl_client))
 110                 return -EINVAL;
 111         mutex_lock(&iwpm_admin_lock);
 112         if (!refcount_read(&iwpm_admin.refcount)) {
 113                 mutex_unlock(&iwpm_admin_lock);
 114                 pr_err("%s Incorrect usage - negative refcount\n", __func__);
 115                 return -EINVAL;
 116         }
 117         if (refcount_dec_and_test(&iwpm_admin.refcount)) {
 118                 free_hash_bucket();
 119                 free_reminfo_bucket();
 120                 pr_debug("%s: Resources are destroyed\n", __func__);
 121         }
 122         mutex_unlock(&iwpm_admin_lock);
 123         iwpm_set_valid(nl_client, 0);
 124         iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
 125         return 0;
 126 }
 127
 128 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
 129                                                struct sockaddr_storage *);
 130
 131 /**
 132  * iwpm_create_mapinfo - Store local and mapped IPv4/IPv6 address
 133  *                       info in a hash table
 134  * @local_sockaddr: Local ip/tcp address
 135  * @mapped_sockaddr: Mapped local ip/tcp address
 136  * @nl_client: The index of the netlink client
 137  * @map_flags: IWPM mapping flags
 138  */
 139 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
 140                         struct sockaddr_storage *mapped_sockaddr,
 141                         u8 nl_client, u32 map_flags)
 142 {
 143         struct hlist_head *hash_bucket_head = NULL;
 144         struct iwpm_mapping_info *map_info;
 145         unsigned long flags;
 146         int ret = -EINVAL;
 147
 148         if (!iwpm_valid_client(nl_client))
 149                 return ret;
 150         map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
 151         if (!map_info)
 152                 return -ENOMEM;
 153
 154         memcpy(&map_info->local_sockaddr, local_sockaddr,
 155                sizeof(struct sockaddr_storage));
 156         memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
 157                sizeof(struct sockaddr_storage));
 158         map_info->nl_client = nl_client;
 159         map_info->map_flags = map_flags;
 160
 161         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 162         if (iwpm_hash_bucket) {
 163                 hash_bucket_head = get_mapinfo_hash_bucket(
 164                                         &map_info->local_sockaddr,
 165                                         &map_info->mapped_sockaddr);
 166                 if (hash_bucket_head) {
 167                         hlist_add_head(&map_info->hlist_node, hash_bucket_head);
 168                         ret = 0;
 169                 }
 170         }
 171         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 172
 173         if (!hash_bucket_head)
 174                 kfree(map_info);
 175         return ret;
 176 }
 177
 178 /**
 179  * iwpm_remove_mapinfo - Remove local and mapped IPv4/IPv6 address
 180  *                       info from the hash table
 181  * @local_sockaddr: Local ip/tcp address
 182  * @mapped_local_addr: Mapped local ip/tcp address
 183  *
 184  * Returns err code if mapping info is not found in the hash table,
 185  * otherwise returns 0
 186  */
 187 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
 188                         struct sockaddr_storage *mapped_local_addr)
 189 {
 190         struct hlist_node *tmp_hlist_node;
 191         struct hlist_head *hash_bucket_head;
 192         struct iwpm_mapping_info *map_info = NULL;
 193         unsigned long flags;
 194         int ret = -EINVAL;
 195
 196         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 197         if (iwpm_hash_bucket) {
 198                 hash_bucket_head = get_mapinfo_hash_bucket(
 199                                         local_sockaddr,
 200                                         mapped_local_addr);
 201                 if (!hash_bucket_head)
 202                         goto remove_mapinfo_exit;
 203
 204                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 205                                         hash_bucket_head, hlist_node) {
 206
 207                         if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
 208                                                 mapped_local_addr)) {
 209
 210                                 hlist_del_init(&map_info->hlist_node);
 211                                 kfree(map_info);
 212                                 ret = 0;
 213                                 break;
 214                         }
 215                 }
 216         }
 217 remove_mapinfo_exit:
 218         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 219         return ret;
 220 }
 221
 222 static void free_hash_bucket(void)
 223 {
 224         struct hlist_node *tmp_hlist_node;
 225         struct iwpm_mapping_info *map_info;
 226         unsigned long flags;
 227         int i;
 228
 229         /* remove all the mapinfo data from the list */
 230         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 231         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 232                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 233                         &iwpm_hash_bucket[i], hlist_node) {
 234
 235                                 hlist_del_init(&map_info->hlist_node);
 236                                 kfree(map_info);
 237                         }
 238         }
 239         /* free the hash list */
 240         kfree(iwpm_hash_bucket);
 241         iwpm_hash_bucket = NULL;
 242         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 243 }
 244
 245 static void free_reminfo_bucket(void)
 246 {
 247         struct hlist_node *tmp_hlist_node;
 248         struct iwpm_remote_info *rem_info;
 249         unsigned long flags;
 250         int i;
 251
 252         /* remove all the remote info from the list */
 253         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 254         for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
 255                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 256                         &iwpm_reminfo_bucket[i], hlist_node) {
 257
 258                                 hlist_del_init(&rem_info->hlist_node);
 259                                 kfree(rem_info);
 260                         }
 261         }
 262         /* free the hash list */
 263         kfree(iwpm_reminfo_bucket);
 264         iwpm_reminfo_bucket = NULL;
 265         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 266 }
 267
 268 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
 269                                                 struct sockaddr_storage *);
 270
 271 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
 272 {
 273         struct hlist_head *hash_bucket_head;
 274         unsigned long flags;
 275
 276         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 277         if (iwpm_reminfo_bucket) {
 278                 hash_bucket_head = get_reminfo_hash_bucket(
 279                                         &rem_info->mapped_loc_sockaddr,
 280                                         &rem_info->mapped_rem_sockaddr);
 281                 if (hash_bucket_head)
 282                         hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
 283         }
 284         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 285 }
 286
 287 /**
 288  * iwpm_get_remote_info - Get the remote connecting peer address info
 289  *
 290  * @mapped_loc_addr: Mapped local address of the listening peer
 291  * @mapped_rem_addr: Mapped remote address of the connecting peer
 292  * @remote_addr: To store the remote address of the connecting peer
 293  * @nl_client: The index of the netlink client
 294  *
 295  * The remote address info is retrieved and provided to the client in
 296  * the remote_addr. After that it is removed from the hash table
 297  */
 298 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
 299                          struct sockaddr_storage *mapped_rem_addr,
 300                          struct sockaddr_storage *remote_addr,
 301                          u8 nl_client)
 302 {
 303         struct hlist_node *tmp_hlist_node;
 304         struct hlist_head *hash_bucket_head;
 305         struct iwpm_remote_info *rem_info = NULL;
 306         unsigned long flags;
 307         int ret = -EINVAL;
 308
 309         if (!iwpm_valid_client(nl_client)) {
 310                 pr_info("%s: Invalid client = %u\n", __func__, nl_client);
 311                 return ret;
 312         }
 313         spin_lock_irqsave(&iwpm_reminfo_lock, flags);
 314         if (iwpm_reminfo_bucket) {
 315                 hash_bucket_head = get_reminfo_hash_bucket(
 316                                         mapped_loc_addr,
 317                                         mapped_rem_addr);
 318                 if (!hash_bucket_head)
 319                         goto get_remote_info_exit;
 320                 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
 321                                         hash_bucket_head, hlist_node) {
 322
 323                         if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
 324                                 mapped_loc_addr) &&
 325                                 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
 326                                 mapped_rem_addr)) {
 327
 328                                 memcpy(remote_addr, &rem_info->remote_sockaddr,
 329                                         sizeof(struct sockaddr_storage));
 330                                 iwpm_print_sockaddr(remote_addr,
 331                                                 "get_remote_info: Remote sockaddr:");
 332
 333                                 hlist_del_init(&rem_info->hlist_node);
 334                                 kfree(rem_info);
 335                                 ret = 0;
 336                                 break;
 337                         }
 338                 }
 339         }
 340 get_remote_info_exit:
 341         spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
 342         return ret;
 343 }
 344
 345 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
 346                                         u8 nl_client, gfp_t gfp)
 347 {
 348         struct iwpm_nlmsg_request *nlmsg_request = NULL;
 349         unsigned long flags;
 350
 351         nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
 352         if (!nlmsg_request)
 353                 return NULL;
 354
 355         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 356         list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
 357         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 358
 359         kref_init(&nlmsg_request->kref);
 360         kref_get(&nlmsg_request->kref);
 361         nlmsg_request->nlmsg_seq = nlmsg_seq;
 362         nlmsg_request->nl_client = nl_client;
 363         nlmsg_request->request_done = 0;
 364         nlmsg_request->err_code = 0;
 365         sema_init(&nlmsg_request->sem, 1);
 366         down(&nlmsg_request->sem);
 367         return nlmsg_request;
 368 }
 369
 370 void iwpm_free_nlmsg_request(struct kref *kref)
 371 {
 372         struct iwpm_nlmsg_request *nlmsg_request;
 373         unsigned long flags;
 374
 375         nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
 376
 377         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 378         list_del_init(&nlmsg_request->inprocess_list);
 379         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 380
 381         if (!nlmsg_request->request_done)
 382                 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
 383                         __func__, nlmsg_request->nlmsg_seq);
 384         kfree(nlmsg_request);
 385 }
 386
 387 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
 388 {
 389         struct iwpm_nlmsg_request *nlmsg_request;
 390         struct iwpm_nlmsg_request *found_request = NULL;
 391         unsigned long flags;
 392
 393         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 394         list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
 395                             inprocess_list) {
 396                 if (nlmsg_request->nlmsg_seq == echo_seq) {
 397                         found_request = nlmsg_request;
 398                         kref_get(&nlmsg_request->kref);
 399                         break;
 400                 }
 401         }
 402         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 403         return found_request;
 404 }
 405
 406 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
 407 {
 408         int ret;
 409
 410         ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
 411         if (ret) {
 412                 ret = -EINVAL;
 413                 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
 414                         __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
 415         } else {
 416                 ret = nlmsg_request->err_code;
 417         }
 418         kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
 419         return ret;
 420 }
 421
 422 int iwpm_get_nlmsg_seq(void)
 423 {
 424         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
 425 }
 426
 427 int iwpm_valid_client(u8 nl_client)
 428 {
 429         return iwpm_admin.client_list[nl_client];
 430 }
 431
 432 void iwpm_set_valid(u8 nl_client, int valid)
 433 {
 434         iwpm_admin.client_list[nl_client] = valid;
 435 }
 436
 437 /* valid client */
 438 u32 iwpm_get_registration(u8 nl_client)
 439 {
 440         return iwpm_admin.reg_list[nl_client];
 441 }
 442
 443 /* valid client */
 444 void iwpm_set_registration(u8 nl_client, u32 reg)
 445 {
 446         iwpm_admin.reg_list[nl_client] = reg;
 447 }
 448
 449 /* valid client */
 450 u32 iwpm_check_registration(u8 nl_client, u32 reg)
 451 {
 452         return (iwpm_get_registration(nl_client) & reg);
 453 }
 454
 455 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 456                                 struct sockaddr_storage *b_sockaddr)
 457 {
 458         if (a_sockaddr->ss_family != b_sockaddr->ss_family)
 459                 return 1;
 460         if (a_sockaddr->ss_family == AF_INET) {
 461                 struct sockaddr_in *a4_sockaddr =
 462                         (struct sockaddr_in *)a_sockaddr;
 463                 struct sockaddr_in *b4_sockaddr =
 464                         (struct sockaddr_in *)b_sockaddr;
 465                 if (!memcmp(&a4_sockaddr->sin_addr,
 466                         &b4_sockaddr->sin_addr, sizeof(struct in_addr))
 467                         && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
 468                                 return 0;
 469
 470         } else if (a_sockaddr->ss_family == AF_INET6) {
 471                 struct sockaddr_in6 *a6_sockaddr =
 472                         (struct sockaddr_in6 *)a_sockaddr;
 473                 struct sockaddr_in6 *b6_sockaddr =
 474                         (struct sockaddr_in6 *)b_sockaddr;
 475                 if (!memcmp(&a6_sockaddr->sin6_addr,
 476                         &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
 477                         && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
 478                                 return 0;
 479
 480         } else {
 481                 pr_err("%s: Invalid sockaddr family\n", __func__);
 482         }
 483         return 1;
 484 }
 485
 486 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 487                                                 int nl_client)
 488 {
 489         struct sk_buff *skb = NULL;
 490
 491         skb = dev_alloc_skb(IWPM_MSG_SIZE);
 492         if (!skb)
 493                 goto create_nlmsg_exit;
 494
 495         if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
 496                            NLM_F_REQUEST))) {
 497                 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
 498                 dev_kfree_skb(skb);
 499                 skb = NULL;
 500         }
 501 create_nlmsg_exit:
 502         return skb;
 503 }
 504
 505 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 506                                    const struct nla_policy *nlmsg_policy,
 507                                    struct nlattr *nltb[], const char *msg_type)
 508 {
 509         int nlh_len = 0;
 510         int ret;
 511         const char *err_str = "";
 512
 513         ret = nlmsg_validate_deprecated(cb->nlh, nlh_len, policy_max - 1,
 514                                         nlmsg_policy, NULL);
 515         if (ret) {
 516                 err_str = "Invalid attribute";
 517                 goto parse_nlmsg_error;
 518         }
 519         ret = nlmsg_parse_deprecated(cb->nlh, nlh_len, nltb, policy_max - 1,
 520                                      nlmsg_policy, NULL);
 521         if (ret) {
 522                 err_str = "Unable to parse the nlmsg";
 523                 goto parse_nlmsg_error;
 524         }
 525         ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
 526         if (ret) {
 527                 err_str = "Invalid NULL attribute";
 528                 goto parse_nlmsg_error;
 529         }
 530         return 0;
 531 parse_nlmsg_error:
 532         pr_warn("%s: %s (msg type %s ret = %d)\n",
 533                         __func__, err_str, msg_type, ret);
 534         return ret;
 535 }
 536
 537 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
 538 {
 539         struct sockaddr_in6 *sockaddr_v6;
 540         struct sockaddr_in *sockaddr_v4;
 541
 542         switch (sockaddr->ss_family) {
 543         case AF_INET:
 544                 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
 545                 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
 546                         msg, &sockaddr_v4->sin_addr,
 547                         ntohs(sockaddr_v4->sin_port),
 548                         ntohs(sockaddr_v4->sin_port));
 549                 break;
 550         case AF_INET6:
 551                 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
 552                 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
 553                         msg, &sockaddr_v6->sin6_addr,
 554                         ntohs(sockaddr_v6->sin6_port),
 555                         ntohs(sockaddr_v6->sin6_port));
 556                 break;
 557         default:
 558                 break;
 559         }
 560 }
 561
 562 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
 563 {
 564         u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
 565         u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
 566         return hash;
 567 }
 568
 569 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
 570 {
 571         u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
 572         u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
 573         return hash;
 574 }
 575
 576 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
 577                                 struct sockaddr_storage *b_sockaddr, u32 *hash)
 578 {
 579         u32 a_hash, b_hash;
 580
 581         if (a_sockaddr->ss_family == AF_INET) {
 582                 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
 583                 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
 584
 585         } else if (a_sockaddr->ss_family == AF_INET6) {
 586                 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
 587                 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
 588         } else {
 589                 pr_err("%s: Invalid sockaddr family\n", __func__);
 590                 return -EINVAL;
 591         }
 592
 593         if (a_hash == b_hash) /* if port mapper isn't available */
 594                 *hash = a_hash;
 595         else
 596                 *hash = jhash_2words(a_hash, b_hash, 0);
 597         return 0;
 598 }
 599
 600 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
 601                                 *local_sockaddr, struct sockaddr_storage
 602                                 *mapped_sockaddr)
 603 {
 604         u32 hash;
 605         int ret;
 606
 607         ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
 608         if (ret)
 609                 return NULL;
 610         return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
 611 }
 612
 613 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
 614                                 *mapped_loc_sockaddr, struct sockaddr_storage
 615                                 *mapped_rem_sockaddr)
 616 {
 617         u32 hash;
 618         int ret;
 619
 620         ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
 621         if (ret)
 622                 return NULL;
 623         return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
 624 }
 625
 626 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
 627 {
 628         struct sk_buff *skb = NULL;
 629         struct nlmsghdr *nlh;
 630         u32 msg_seq;
 631         const char *err_str = "";
 632         int ret = -EINVAL;
 633
 634         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
 635         if (!skb) {
 636                 err_str = "Unable to create a nlmsg";
 637                 goto mapinfo_num_error;
 638         }
 639         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 640         msg_seq = 0;
 641         err_str = "Unable to put attribute of mapinfo number nlmsg";
 642         ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
 643         if (ret)
 644                 goto mapinfo_num_error;
 645         ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 646                                 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
 647         if (ret)
 648                 goto mapinfo_num_error;
 649
 650         nlmsg_end(skb, nlh);
 651
 652         ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
 653         if (ret) {
 654                 skb = NULL;
 655                 err_str = "Unable to send a nlmsg";
 656                 goto mapinfo_num_error;
 657         }
 658         pr_debug("%s: Sent mapping number = %u\n", __func__, mapping_num);
 659         return 0;
 660 mapinfo_num_error:
 661         pr_info("%s: %s\n", __func__, err_str);
 662         dev_kfree_skb(skb);
 663         return ret;
 664 }
 665
 666 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
 667 {
 668         struct nlmsghdr *nlh = NULL;
 669         int ret = 0;
 670
 671         if (!skb)
 672                 return ret;
 673         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 674                            RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 675                 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
 676                 dev_kfree_skb(skb);
 677                 return -ENOMEM;
 678         }
 679         nlh->nlmsg_type = NLMSG_DONE;
 680         ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
 681         if (ret)
 682                 pr_warn("%s Unable to send a nlmsg\n", __func__);
 683         return ret;
 684 }
 685
 686 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
 687 {
 688         struct iwpm_mapping_info *map_info;
 689         struct sk_buff *skb = NULL;
 690         struct nlmsghdr *nlh;
 691         int skb_num = 0, mapping_num = 0;
 692         int i = 0, nlmsg_bytes = 0;
 693         unsigned long flags;
 694         const char *err_str = "";
 695         int ret;
 696
 697         skb = dev_alloc_skb(NLMSG_GOODSIZE);
 698         if (!skb) {
 699                 ret = -ENOMEM;
 700                 err_str = "Unable to allocate skb";
 701                 goto send_mapping_info_exit;
 702         }
 703         skb_num++;
 704         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 705         ret = -EINVAL;
 706         for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 707                 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
 708                                      hlist_node) {
 709                         if (map_info->nl_client != nl_client)
 710                                 continue;
 711                         nlh = NULL;
 712                         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 713                                         RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 714                                 ret = -ENOMEM;
 715                                 err_str = "Unable to put the nlmsg header";
 716                                 goto send_mapping_info_unlock;
 717                         }
 718                         err_str = "Unable to put attribute of the nlmsg";
 719                         ret = ibnl_put_attr(skb, nlh,
 720                                         sizeof(struct sockaddr_storage),
 721                                         &map_info->local_sockaddr,
 722                                         IWPM_NLA_MAPINFO_LOCAL_ADDR);
 723                         if (ret)
 724                                 goto send_mapping_info_unlock;
 725
 726                         ret = ibnl_put_attr(skb, nlh,
 727                                         sizeof(struct sockaddr_storage),
 728                                         &map_info->mapped_sockaddr,
 729                                         IWPM_NLA_MAPINFO_MAPPED_ADDR);
 730                         if (ret)
 731                                 goto send_mapping_info_unlock;
 732
 733                         if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) {
 734                                 ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 735                                                 &map_info->map_flags,
 736                                                 IWPM_NLA_MAPINFO_FLAGS);
 737                                 if (ret)
 738                                         goto send_mapping_info_unlock;
 739                         }
 740
 741                         nlmsg_end(skb, nlh);
 742
 743                         iwpm_print_sockaddr(&map_info->local_sockaddr,
 744                                 "send_mapping_info: Local sockaddr:");
 745                         iwpm_print_sockaddr(&map_info->mapped_sockaddr,
 746                                 "send_mapping_info: Mapped local sockaddr:");
 747                         mapping_num++;
 748                         nlmsg_bytes += nlh->nlmsg_len;
 749
 750                         /* check if all mappings can fit in one skb */
 751                         if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
 752                                 /* and leave room for NLMSG_DONE */
 753                                 nlmsg_bytes = 0;
 754                                 skb_num++;
 755                                 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
 756                                                        flags);
 757                                 /* send the skb */
 758                                 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
 759                                 skb = NULL;
 760                                 if (ret) {
 761                                         err_str = "Unable to send map info";
 762                                         goto send_mapping_info_exit;
 763                                 }
 764                                 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
 765                                         ret = -ENOMEM;
 766                                         err_str = "Insufficient skbs for map info";
 767                                         goto send_mapping_info_exit;
 768                                 }
 769                                 skb = dev_alloc_skb(NLMSG_GOODSIZE);
 770                                 if (!skb) {
 771                                         ret = -ENOMEM;
 772                                         err_str = "Unable to allocate skb";
 773                                         goto send_mapping_info_exit;
 774                                 }
 775                                 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 776                         }
 777                 }
 778         }
 779 send_mapping_info_unlock:
 780         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 781 send_mapping_info_exit:
 782         if (ret) {
 783                 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
 784                 dev_kfree_skb(skb);
 785                 return ret;
 786         }
 787         send_nlmsg_done(skb, nl_client, iwpm_pid);
 788         return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
 789 }
 790
 791 int iwpm_mapinfo_available(void)
 792 {
 793         unsigned long flags;
 794         int full_bucket = 0, i = 0;
 795
 796         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 797         if (iwpm_hash_bucket) {
 798                 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
 799                         if (!hlist_empty(&iwpm_hash_bucket[i])) {
 800                                 full_bucket = 1;
 801                                 break;
 802                         }
 803                 }
 804         }
 805         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 806         return full_bucket;
 807 }
 808
 809 int iwpm_send_hello(u8 nl_client, int iwpm_pid, u16 abi_version)
 810 {
 811         struct sk_buff *skb = NULL;
 812         struct nlmsghdr *nlh;
 813         const char *err_str = "";
 814         int ret = -EINVAL;
 815
 816         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_HELLO, &nlh, nl_client);
 817         if (!skb) {
 818                 err_str = "Unable to create a nlmsg";
 819                 goto hello_num_error;
 820         }
 821         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 822         err_str = "Unable to put attribute of abi_version into nlmsg";
 823         ret = ibnl_put_attr(skb, nlh, sizeof(u16), &abi_version,
 824                             IWPM_NLA_HELLO_ABI_VERSION);
 825         if (ret)
 826                 goto hello_num_error;
 827         nlmsg_end(skb, nlh);
 828
 829         ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
 830         if (ret) {
 831                 skb = NULL;
 832                 err_str = "Unable to send a nlmsg";
 833                 goto hello_num_error;
 834         }
 835         pr_debug("%s: Sent hello abi_version = %u\n", __func__, abi_version);
 836         return 0;
 837 hello_num_error:
 838         pr_info("%s: %s\n", __func__, err_str);
 839         dev_kfree_skb(skb);
 840         return ret;
 841 }