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