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_HASH_BUCKET_SIZE   512
  37 #define IWPM_HASH_BUCKET_MASK   (IWPM_HASH_BUCKET_SIZE - 1)
  38
  39 static LIST_HEAD(iwpm_nlmsg_req_list);
  40 static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
  41
  42 static struct hlist_head *iwpm_hash_bucket;
  43 static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
  44
  45 static DEFINE_MUTEX(iwpm_admin_lock);
  46 static struct iwpm_admin_data iwpm_admin;
  47
  48 int iwpm_init(u8 nl_client)
  49 {
  50         if (iwpm_valid_client(nl_client))
  51                 return -EINVAL;
  52         mutex_lock(&iwpm_admin_lock);
  53         if (atomic_read(&iwpm_admin.refcount) == 0) {
  54                 iwpm_hash_bucket = kzalloc(IWPM_HASH_BUCKET_SIZE *
  55                                         sizeof(struct hlist_head), GFP_KERNEL);
  56                 if (!iwpm_hash_bucket) {
  57                         mutex_unlock(&iwpm_admin_lock);
  58                         pr_err("%s Unable to create mapinfo hash table\n", __func__);
  59                         return -ENOMEM;
  60                 }
  61         }
  62         atomic_inc(&iwpm_admin.refcount);
  63         mutex_unlock(&iwpm_admin_lock);
  64         iwpm_set_valid(nl_client, 1);
  65         return 0;
  66 }
  67 EXPORT_SYMBOL(iwpm_init);
  68
  69 static void free_hash_bucket(void);
  70
  71 int iwpm_exit(u8 nl_client)
  72 {
  73
  74         if (!iwpm_valid_client(nl_client))
  75                 return -EINVAL;
  76         mutex_lock(&iwpm_admin_lock);
  77         if (atomic_read(&iwpm_admin.refcount) == 0) {
  78                 mutex_unlock(&iwpm_admin_lock);
  79                 pr_err("%s Incorrect usage - negative refcount\n", __func__);
  80                 return -EINVAL;
  81         }
  82         if (atomic_dec_and_test(&iwpm_admin.refcount)) {
  83                 free_hash_bucket();
  84                 pr_debug("%s: Mapinfo hash table is destroyed\n", __func__);
  85         }
  86         mutex_unlock(&iwpm_admin_lock);
  87         iwpm_set_valid(nl_client, 0);
  88         return 0;
  89 }
  90 EXPORT_SYMBOL(iwpm_exit);
  91
  92 static struct hlist_head *get_hash_bucket_head(struct sockaddr_storage *,
  93                                                struct sockaddr_storage *);
  94
  95 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
  96                         struct sockaddr_storage *mapped_sockaddr,
  97                         u8 nl_client)
  98 {
  99         struct hlist_head *hash_bucket_head;
 100         struct iwpm_mapping_info *map_info;
 101         unsigned long flags;
 102
 103         if (!iwpm_valid_client(nl_client))
 104                 return -EINVAL;
 105         map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
 106         if (!map_info) {
 107                 pr_err("%s: Unable to allocate a mapping info\n", __func__);
 108                 return -ENOMEM;
 109         }
 110         memcpy(&map_info->local_sockaddr, local_sockaddr,
 111                sizeof(struct sockaddr_storage));
 112         memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
 113                sizeof(struct sockaddr_storage));
 114         map_info->nl_client = nl_client;
 115
 116         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 117         if (iwpm_hash_bucket) {
 118                 hash_bucket_head = get_hash_bucket_head(
 119                                         &map_info->local_sockaddr,
 120                                         &map_info->mapped_sockaddr);
 121                 hlist_add_head(&map_info->hlist_node, hash_bucket_head);
 122         }
 123         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 124         return 0;
 125 }
 126 EXPORT_SYMBOL(iwpm_create_mapinfo);
 127
 128 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
 129                         struct sockaddr_storage *mapped_local_addr)
 130 {
 131         struct hlist_node *tmp_hlist_node;
 132         struct hlist_head *hash_bucket_head;
 133         struct iwpm_mapping_info *map_info = NULL;
 134         unsigned long flags;
 135         int ret = -EINVAL;
 136
 137         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 138         if (iwpm_hash_bucket) {
 139                 hash_bucket_head = get_hash_bucket_head(
 140                                         local_sockaddr,
 141                                         mapped_local_addr);
 142                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 143                                         hash_bucket_head, hlist_node) {
 144
 145                         if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
 146                                                 mapped_local_addr)) {
 147
 148                                 hlist_del_init(&map_info->hlist_node);
 149                                 kfree(map_info);
 150                                 ret = 0;
 151                                 break;
 152                         }
 153                 }
 154         }
 155         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 156         return ret;
 157 }
 158 EXPORT_SYMBOL(iwpm_remove_mapinfo);
 159
 160 static void free_hash_bucket(void)
 161 {
 162         struct hlist_node *tmp_hlist_node;
 163         struct iwpm_mapping_info *map_info;
 164         unsigned long flags;
 165         int i;
 166
 167         /* remove all the mapinfo data from the list */
 168         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 169         for (i = 0; i < IWPM_HASH_BUCKET_SIZE; i++) {
 170                 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
 171                         &iwpm_hash_bucket[i], hlist_node) {
 172
 173                                 hlist_del_init(&map_info->hlist_node);
 174                                 kfree(map_info);
 175                         }
 176         }
 177         /* free the hash list */
 178         kfree(iwpm_hash_bucket);
 179         iwpm_hash_bucket = NULL;
 180         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 181 }
 182
 183 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
 184                                         u8 nl_client, gfp_t gfp)
 185 {
 186         struct iwpm_nlmsg_request *nlmsg_request = NULL;
 187         unsigned long flags;
 188
 189         nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
 190         if (!nlmsg_request) {
 191                 pr_err("%s Unable to allocate a nlmsg_request\n", __func__);
 192                 return NULL;
 193         }
 194         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 195         list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
 196         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 197
 198         kref_init(&nlmsg_request->kref);
 199         kref_get(&nlmsg_request->kref);
 200         nlmsg_request->nlmsg_seq = nlmsg_seq;
 201         nlmsg_request->nl_client = nl_client;
 202         nlmsg_request->request_done = 0;
 203         nlmsg_request->err_code = 0;
 204         return nlmsg_request;
 205 }
 206
 207 void iwpm_free_nlmsg_request(struct kref *kref)
 208 {
 209         struct iwpm_nlmsg_request *nlmsg_request;
 210         unsigned long flags;
 211
 212         nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
 213
 214         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 215         list_del_init(&nlmsg_request->inprocess_list);
 216         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 217
 218         if (!nlmsg_request->request_done)
 219                 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
 220                         __func__, nlmsg_request->nlmsg_seq);
 221         kfree(nlmsg_request);
 222 }
 223
 224 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
 225 {
 226         struct iwpm_nlmsg_request *nlmsg_request;
 227         struct iwpm_nlmsg_request *found_request = NULL;
 228         unsigned long flags;
 229
 230         spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
 231         list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
 232                             inprocess_list) {
 233                 if (nlmsg_request->nlmsg_seq == echo_seq) {
 234                         found_request = nlmsg_request;
 235                         kref_get(&nlmsg_request->kref);
 236                         break;
 237                 }
 238         }
 239         spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
 240         return found_request;
 241 }
 242
 243 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
 244 {
 245         int ret;
 246         init_waitqueue_head(&nlmsg_request->waitq);
 247
 248         ret = wait_event_timeout(nlmsg_request->waitq,
 249                         (nlmsg_request->request_done != 0), IWPM_NL_TIMEOUT);
 250         if (!ret) {
 251                 ret = -EINVAL;
 252                 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
 253                         __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
 254         } else {
 255                 ret = nlmsg_request->err_code;
 256         }
 257         kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
 258         return ret;
 259 }
 260
 261 int iwpm_get_nlmsg_seq(void)
 262 {
 263         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
 264 }
 265
 266 int iwpm_valid_client(u8 nl_client)
 267 {
 268         if (nl_client >= RDMA_NL_NUM_CLIENTS)
 269                 return 0;
 270         return iwpm_admin.client_list[nl_client];
 271 }
 272
 273 void iwpm_set_valid(u8 nl_client, int valid)
 274 {
 275         if (nl_client >= RDMA_NL_NUM_CLIENTS)
 276                 return;
 277         iwpm_admin.client_list[nl_client] = valid;
 278 }
 279
 280 /* valid client */
 281 int iwpm_registered_client(u8 nl_client)
 282 {
 283         return iwpm_admin.reg_list[nl_client];
 284 }
 285
 286 /* valid client */
 287 void iwpm_set_registered(u8 nl_client, int reg)
 288 {
 289         iwpm_admin.reg_list[nl_client] = reg;
 290 }
 291
 292 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
 293                                 struct sockaddr_storage *b_sockaddr)
 294 {
 295         if (a_sockaddr->ss_family != b_sockaddr->ss_family)
 296                 return 1;
 297         if (a_sockaddr->ss_family == AF_INET) {
 298                 struct sockaddr_in *a4_sockaddr =
 299                         (struct sockaddr_in *)a_sockaddr;
 300                 struct sockaddr_in *b4_sockaddr =
 301                         (struct sockaddr_in *)b_sockaddr;
 302                 if (!memcmp(&a4_sockaddr->sin_addr,
 303                         &b4_sockaddr->sin_addr, sizeof(struct in_addr))
 304                         && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
 305                                 return 0;
 306
 307         } else if (a_sockaddr->ss_family == AF_INET6) {
 308                 struct sockaddr_in6 *a6_sockaddr =
 309                         (struct sockaddr_in6 *)a_sockaddr;
 310                 struct sockaddr_in6 *b6_sockaddr =
 311                         (struct sockaddr_in6 *)b_sockaddr;
 312                 if (!memcmp(&a6_sockaddr->sin6_addr,
 313                         &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
 314                         && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
 315                                 return 0;
 316
 317         } else {
 318                 pr_err("%s: Invalid sockaddr family\n", __func__);
 319         }
 320         return 1;
 321 }
 322
 323 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
 324                                                 int nl_client)
 325 {
 326         struct sk_buff *skb = NULL;
 327
 328         skb = dev_alloc_skb(NLMSG_GOODSIZE);
 329         if (!skb) {
 330                 pr_err("%s Unable to allocate skb\n", __func__);
 331                 goto create_nlmsg_exit;
 332         }
 333         if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
 334                            NLM_F_REQUEST))) {
 335                 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
 336                 dev_kfree_skb(skb);
 337                 skb = NULL;
 338         }
 339 create_nlmsg_exit:
 340         return skb;
 341 }
 342
 343 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
 344                                    const struct nla_policy *nlmsg_policy,
 345                                    struct nlattr *nltb[], const char *msg_type)
 346 {
 347         int nlh_len = 0;
 348         int ret;
 349         const char *err_str = "";
 350
 351         ret = nlmsg_validate(cb->nlh, nlh_len, policy_max-1, nlmsg_policy);
 352         if (ret) {
 353                 err_str = "Invalid attribute";
 354                 goto parse_nlmsg_error;
 355         }
 356         ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max-1, nlmsg_policy);
 357         if (ret) {
 358                 err_str = "Unable to parse the nlmsg";
 359                 goto parse_nlmsg_error;
 360         }
 361         ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
 362         if (ret) {
 363                 err_str = "Invalid NULL attribute";
 364                 goto parse_nlmsg_error;
 365         }
 366         return 0;
 367 parse_nlmsg_error:
 368         pr_warn("%s: %s (msg type %s ret = %d)\n",
 369                         __func__, err_str, msg_type, ret);
 370         return ret;
 371 }
 372
 373 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
 374 {
 375         struct sockaddr_in6 *sockaddr_v6;
 376         struct sockaddr_in *sockaddr_v4;
 377
 378         switch (sockaddr->ss_family) {
 379         case AF_INET:
 380                 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
 381                 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
 382                         msg, &sockaddr_v4->sin_addr,
 383                         ntohs(sockaddr_v4->sin_port),
 384                         ntohs(sockaddr_v4->sin_port));
 385                 break;
 386         case AF_INET6:
 387                 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
 388                 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
 389                         msg, &sockaddr_v6->sin6_addr,
 390                         ntohs(sockaddr_v6->sin6_port),
 391                         ntohs(sockaddr_v6->sin6_port));
 392                 break;
 393         default:
 394                 break;
 395         }
 396 }
 397
 398 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
 399 {
 400         u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
 401         u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
 402         return hash;
 403 }
 404
 405 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
 406 {
 407         u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
 408         u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
 409         return hash;
 410 }
 411
 412 static struct hlist_head *get_hash_bucket_head(struct sockaddr_storage
 413                                                *local_sockaddr,
 414                                                struct sockaddr_storage
 415                                                *mapped_sockaddr)
 416 {
 417         u32 local_hash, mapped_hash, hash;
 418
 419         if (local_sockaddr->ss_family == AF_INET) {
 420                 local_hash = iwpm_ipv4_jhash((struct sockaddr_in *) local_sockaddr);
 421                 mapped_hash = iwpm_ipv4_jhash((struct sockaddr_in *) mapped_sockaddr);
 422
 423         } else if (local_sockaddr->ss_family == AF_INET6) {
 424                 local_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) local_sockaddr);
 425                 mapped_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) mapped_sockaddr);
 426         } else {
 427                 pr_err("%s: Invalid sockaddr family\n", __func__);
 428                 return NULL;
 429         }
 430
 431         if (local_hash == mapped_hash) /* if port mapper isn't available */
 432                 hash = local_hash;
 433         else
 434                 hash = jhash_2words(local_hash, mapped_hash, 0);
 435
 436         return &iwpm_hash_bucket[hash & IWPM_HASH_BUCKET_MASK];
 437 }
 438
 439 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
 440 {
 441         struct sk_buff *skb = NULL;
 442         struct nlmsghdr *nlh;
 443         u32 msg_seq;
 444         const char *err_str = "";
 445         int ret = -EINVAL;
 446
 447         skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
 448         if (!skb) {
 449                 err_str = "Unable to create a nlmsg";
 450                 goto mapinfo_num_error;
 451         }
 452         nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
 453         msg_seq = 0;
 454         err_str = "Unable to put attribute of mapinfo number nlmsg";
 455         ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
 456         if (ret)
 457                 goto mapinfo_num_error;
 458         ret = ibnl_put_attr(skb, nlh, sizeof(u32),
 459                                 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
 460         if (ret)
 461                 goto mapinfo_num_error;
 462         ret = ibnl_unicast(skb, nlh, iwpm_pid);
 463         if (ret) {
 464                 skb = NULL;
 465                 err_str = "Unable to send a nlmsg";
 466                 goto mapinfo_num_error;
 467         }
 468         pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
 469         return 0;
 470 mapinfo_num_error:
 471         pr_info("%s: %s\n", __func__, err_str);
 472         if (skb)
 473                 dev_kfree_skb(skb);
 474         return ret;
 475 }
 476
 477 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
 478 {
 479         struct nlmsghdr *nlh = NULL;
 480         int ret = 0;
 481
 482         if (!skb)
 483                 return ret;
 484         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 485                            RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 486                 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
 487                 return -ENOMEM;
 488         }
 489         nlh->nlmsg_type = NLMSG_DONE;
 490         ret = ibnl_unicast(skb, (struct nlmsghdr *)skb->data, iwpm_pid);
 491         if (ret)
 492                 pr_warn("%s Unable to send a nlmsg\n", __func__);
 493         return ret;
 494 }
 495
 496 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
 497 {
 498         struct iwpm_mapping_info *map_info;
 499         struct sk_buff *skb = NULL;
 500         struct nlmsghdr *nlh;
 501         int skb_num = 0, mapping_num = 0;
 502         int i = 0, nlmsg_bytes = 0;
 503         unsigned long flags;
 504         const char *err_str = "";
 505         int ret;
 506
 507         skb = dev_alloc_skb(NLMSG_GOODSIZE);
 508         if (!skb) {
 509                 ret = -ENOMEM;
 510                 err_str = "Unable to allocate skb";
 511                 goto send_mapping_info_exit;
 512         }
 513         skb_num++;
 514         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 515         for (i = 0; i < IWPM_HASH_BUCKET_SIZE; i++) {
 516                 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
 517                                      hlist_node) {
 518                         if (map_info->nl_client != nl_client)
 519                                 continue;
 520                         nlh = NULL;
 521                         if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 522                                         RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 523                                 ret = -ENOMEM;
 524                                 err_str = "Unable to put the nlmsg header";
 525                                 goto send_mapping_info_unlock;
 526                         }
 527                         err_str = "Unable to put attribute of the nlmsg";
 528                         ret = ibnl_put_attr(skb, nlh,
 529                                         sizeof(struct sockaddr_storage),
 530                                         &map_info->local_sockaddr,
 531                                         IWPM_NLA_MAPINFO_LOCAL_ADDR);
 532                         if (ret)
 533                                 goto send_mapping_info_unlock;
 534
 535                         ret = ibnl_put_attr(skb, nlh,
 536                                         sizeof(struct sockaddr_storage),
 537                                         &map_info->mapped_sockaddr,
 538                                         IWPM_NLA_MAPINFO_MAPPED_ADDR);
 539                         if (ret)
 540                                 goto send_mapping_info_unlock;
 541
 542                         iwpm_print_sockaddr(&map_info->local_sockaddr,
 543                                 "send_mapping_info: Local sockaddr:");
 544                         iwpm_print_sockaddr(&map_info->mapped_sockaddr,
 545                                 "send_mapping_info: Mapped local sockaddr:");
 546                         mapping_num++;
 547                         nlmsg_bytes += nlh->nlmsg_len;
 548
 549                         /* check if all mappings can fit in one skb */
 550                         if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
 551                                 /* and leave room for NLMSG_DONE */
 552                                 nlmsg_bytes = 0;
 553                                 skb_num++;
 554                                 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
 555                                                        flags);
 556                                 /* send the skb */
 557                                 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
 558                                 skb = NULL;
 559                                 if (ret) {
 560                                         err_str = "Unable to send map info";
 561                                         goto send_mapping_info_exit;
 562                                 }
 563                                 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
 564                                         ret = -ENOMEM;
 565                                         err_str = "Insufficient skbs for map info";
 566                                         goto send_mapping_info_exit;
 567                                 }
 568                                 skb = dev_alloc_skb(NLMSG_GOODSIZE);
 569                                 if (!skb) {
 570                                         ret = -ENOMEM;
 571                                         err_str = "Unable to allocate skb";
 572                                         goto send_mapping_info_exit;
 573                                 }
 574                                 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 575                         }
 576                 }
 577         }
 578 send_mapping_info_unlock:
 579         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 580 send_mapping_info_exit:
 581         if (ret) {
 582                 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
 583                 if (skb)
 584                         dev_kfree_skb(skb);
 585                 return ret;
 586         }
 587         send_nlmsg_done(skb, nl_client, iwpm_pid);
 588         return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
 589 }
 590
 591 int iwpm_mapinfo_available(void)
 592 {
 593         unsigned long flags;
 594         int full_bucket = 0, i = 0;
 595
 596         spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
 597         if (iwpm_hash_bucket) {
 598                 for (i = 0; i < IWPM_HASH_BUCKET_SIZE; i++) {
 599                         if (!hlist_empty(&iwpm_hash_bucket[i])) {
 600                                 full_bucket = 1;
 601                                 break;
 602                         }
 603                 }
 604         }
 605         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
 606         return full_bucket;
 607 }