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 struct iwpm_admin_data iwpm_admin; 52 53 /** 54 * iwpm_init - Allocate resources for the iwarp port mapper 55 * @nl_client: The index of the netlink client 56 * 57 * Should be called when network interface goes up. 58 */ 59 int iwpm_init(u8 nl_client) 60 { 61 iwpm_hash_bucket = kzalloc_objs(struct hlist_head, 62 IWPM_MAPINFO_HASH_SIZE); 63 if (!iwpm_hash_bucket) 64 return -ENOMEM; 65 66 iwpm_reminfo_bucket = kzalloc_objs(struct hlist_head, 67 IWPM_REMINFO_HASH_SIZE); 68 if (!iwpm_reminfo_bucket) { 69 kfree(iwpm_hash_bucket); 70 return -ENOMEM; 71 } 72 73 iwpm_set_registration(nl_client, IWPM_REG_UNDEF); 74 pr_debug("%s: Mapinfo and reminfo tables are created\n", __func__); 75 return 0; 76 } 77 78 static void free_hash_bucket(void); 79 static void free_reminfo_bucket(void); 80 81 /** 82 * iwpm_exit - Deallocate resources for the iwarp port mapper 83 * @nl_client: The index of the netlink client 84 * 85 * Should be called when network interface goes down. 86 */ 87 int iwpm_exit(u8 nl_client) 88 { 89 free_hash_bucket(); 90 free_reminfo_bucket(); 91 pr_debug("%s: Resources are destroyed\n", __func__); 92 iwpm_set_registration(nl_client, IWPM_REG_UNDEF); 93 return 0; 94 } 95 96 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *, 97 struct sockaddr_storage *); 98 99 /** 100 * iwpm_create_mapinfo - Store local and mapped IPv4/IPv6 address 101 * info in a hash table 102 * @local_sockaddr: Local ip/tcp address 103 * @mapped_sockaddr: Mapped local ip/tcp address 104 * @nl_client: The index of the netlink client 105 * @map_flags: IWPM mapping flags 106 */ 107 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr, 108 struct sockaddr_storage *mapped_sockaddr, 109 u8 nl_client, u32 map_flags) 110 { 111 struct hlist_head *hash_bucket_head = NULL; 112 struct iwpm_mapping_info *map_info; 113 unsigned long flags; 114 int ret = -EINVAL; 115 116 map_info = kzalloc_obj(struct iwpm_mapping_info); 117 if (!map_info) 118 return -ENOMEM; 119 120 memcpy(&map_info->local_sockaddr, local_sockaddr, 121 sizeof(struct sockaddr_storage)); 122 memcpy(&map_info->mapped_sockaddr, mapped_sockaddr, 123 sizeof(struct sockaddr_storage)); 124 map_info->nl_client = nl_client; 125 map_info->map_flags = map_flags; 126 127 spin_lock_irqsave(&iwpm_mapinfo_lock, flags); 128 if (iwpm_hash_bucket) { 129 hash_bucket_head = get_mapinfo_hash_bucket( 130 &map_info->local_sockaddr, 131 &map_info->mapped_sockaddr); 132 if (hash_bucket_head) { 133 hlist_add_head(&map_info->hlist_node, hash_bucket_head); 134 ret = 0; 135 } 136 } 137 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); 138 139 if (!hash_bucket_head) 140 kfree(map_info); 141 return ret; 142 } 143 144 /** 145 * iwpm_remove_mapinfo - Remove local and mapped IPv4/IPv6 address 146 * info from the hash table 147 * @local_sockaddr: Local ip/tcp address 148 * @mapped_local_addr: Mapped local ip/tcp address 149 * 150 * Returns err code if mapping info is not found in the hash table, 151 * otherwise returns 0 152 */ 153 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr, 154 struct sockaddr_storage *mapped_local_addr) 155 { 156 struct hlist_node *tmp_hlist_node; 157 struct hlist_head *hash_bucket_head; 158 struct iwpm_mapping_info *map_info = NULL; 159 unsigned long flags; 160 int ret = -EINVAL; 161 162 spin_lock_irqsave(&iwpm_mapinfo_lock, flags); 163 if (iwpm_hash_bucket) { 164 hash_bucket_head = get_mapinfo_hash_bucket( 165 local_sockaddr, 166 mapped_local_addr); 167 if (!hash_bucket_head) 168 goto remove_mapinfo_exit; 169 170 hlist_for_each_entry_safe(map_info, tmp_hlist_node, 171 hash_bucket_head, hlist_node) { 172 173 if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr, 174 mapped_local_addr)) { 175 176 hlist_del_init(&map_info->hlist_node); 177 kfree(map_info); 178 ret = 0; 179 break; 180 } 181 } 182 } 183 remove_mapinfo_exit: 184 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); 185 return ret; 186 } 187 188 static void free_hash_bucket(void) 189 { 190 struct hlist_node *tmp_hlist_node; 191 struct iwpm_mapping_info *map_info; 192 unsigned long flags; 193 int i; 194 195 /* remove all the mapinfo data from the list */ 196 spin_lock_irqsave(&iwpm_mapinfo_lock, flags); 197 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) { 198 hlist_for_each_entry_safe(map_info, tmp_hlist_node, 199 &iwpm_hash_bucket[i], hlist_node) { 200 201 hlist_del_init(&map_info->hlist_node); 202 kfree(map_info); 203 } 204 } 205 /* free the hash list */ 206 kfree(iwpm_hash_bucket); 207 iwpm_hash_bucket = NULL; 208 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); 209 } 210 211 static void free_reminfo_bucket(void) 212 { 213 struct hlist_node *tmp_hlist_node; 214 struct iwpm_remote_info *rem_info; 215 unsigned long flags; 216 int i; 217 218 /* remove all the remote info from the list */ 219 spin_lock_irqsave(&iwpm_reminfo_lock, flags); 220 for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) { 221 hlist_for_each_entry_safe(rem_info, tmp_hlist_node, 222 &iwpm_reminfo_bucket[i], hlist_node) { 223 224 hlist_del_init(&rem_info->hlist_node); 225 kfree(rem_info); 226 } 227 } 228 /* free the hash list */ 229 kfree(iwpm_reminfo_bucket); 230 iwpm_reminfo_bucket = NULL; 231 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags); 232 } 233 234 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *, 235 struct sockaddr_storage *); 236 237 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info) 238 { 239 struct hlist_head *hash_bucket_head; 240 unsigned long flags; 241 242 spin_lock_irqsave(&iwpm_reminfo_lock, flags); 243 if (iwpm_reminfo_bucket) { 244 hash_bucket_head = get_reminfo_hash_bucket( 245 &rem_info->mapped_loc_sockaddr, 246 &rem_info->mapped_rem_sockaddr); 247 if (hash_bucket_head) 248 hlist_add_head(&rem_info->hlist_node, hash_bucket_head); 249 } 250 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags); 251 } 252 253 /** 254 * iwpm_get_remote_info - Get the remote connecting peer address info 255 * 256 * @mapped_loc_addr: Mapped local address of the listening peer 257 * @mapped_rem_addr: Mapped remote address of the connecting peer 258 * @remote_addr: To store the remote address of the connecting peer 259 * @nl_client: The index of the netlink client 260 * 261 * The remote address info is retrieved and provided to the client in 262 * the remote_addr. After that it is removed from the hash table 263 */ 264 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr, 265 struct sockaddr_storage *mapped_rem_addr, 266 struct sockaddr_storage *remote_addr, 267 u8 nl_client) 268 { 269 struct hlist_node *tmp_hlist_node; 270 struct hlist_head *hash_bucket_head; 271 struct iwpm_remote_info *rem_info = NULL; 272 unsigned long flags; 273 int ret = -EINVAL; 274 275 spin_lock_irqsave(&iwpm_reminfo_lock, flags); 276 if (iwpm_reminfo_bucket) { 277 hash_bucket_head = get_reminfo_hash_bucket( 278 mapped_loc_addr, 279 mapped_rem_addr); 280 if (!hash_bucket_head) 281 goto get_remote_info_exit; 282 hlist_for_each_entry_safe(rem_info, tmp_hlist_node, 283 hash_bucket_head, hlist_node) { 284 285 if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr, 286 mapped_loc_addr) && 287 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr, 288 mapped_rem_addr)) { 289 290 memcpy(remote_addr, &rem_info->remote_sockaddr, 291 sizeof(struct sockaddr_storage)); 292 iwpm_print_sockaddr(remote_addr, 293 "get_remote_info: Remote sockaddr:"); 294 295 hlist_del_init(&rem_info->hlist_node); 296 kfree(rem_info); 297 ret = 0; 298 break; 299 } 300 } 301 } 302 get_remote_info_exit: 303 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags); 304 return ret; 305 } 306 307 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq, 308 u8 nl_client, gfp_t gfp) 309 { 310 struct iwpm_nlmsg_request *nlmsg_request; 311 unsigned long flags; 312 313 nlmsg_request = kzalloc_obj(struct iwpm_nlmsg_request, gfp); 314 if (!nlmsg_request) 315 return NULL; 316 317 kref_init(&nlmsg_request->kref); 318 kref_get(&nlmsg_request->kref); 319 nlmsg_request->nlmsg_seq = nlmsg_seq; 320 nlmsg_request->nl_client = nl_client; 321 nlmsg_request->request_done = 0; 322 nlmsg_request->err_code = 0; 323 sema_init(&nlmsg_request->sem, 1); 324 down(&nlmsg_request->sem); 325 326 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags); 327 list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list); 328 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags); 329 330 return nlmsg_request; 331 } 332 333 void iwpm_free_nlmsg_request(struct kref *kref) 334 { 335 struct iwpm_nlmsg_request *nlmsg_request; 336 unsigned long flags; 337 338 nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref); 339 340 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags); 341 list_del_init(&nlmsg_request->inprocess_list); 342 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags); 343 344 if (!nlmsg_request->request_done) 345 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n", 346 __func__, nlmsg_request->nlmsg_seq); 347 kfree(nlmsg_request); 348 } 349 350 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq) 351 { 352 struct iwpm_nlmsg_request *nlmsg_request; 353 struct iwpm_nlmsg_request *found_request = NULL; 354 unsigned long flags; 355 356 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags); 357 list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list, 358 inprocess_list) { 359 if (nlmsg_request->nlmsg_seq == echo_seq) { 360 found_request = nlmsg_request; 361 kref_get(&nlmsg_request->kref); 362 break; 363 } 364 } 365 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags); 366 return found_request; 367 } 368 369 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request) 370 { 371 int ret; 372 373 ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT); 374 if (ret) { 375 ret = -EINVAL; 376 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n", 377 __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq); 378 } else { 379 ret = nlmsg_request->err_code; 380 } 381 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request); 382 return ret; 383 } 384 385 int iwpm_get_nlmsg_seq(void) 386 { 387 return atomic_inc_return(&iwpm_admin.nlmsg_seq); 388 } 389 390 /* valid client */ 391 u32 iwpm_get_registration(u8 nl_client) 392 { 393 return iwpm_admin.reg_list[nl_client]; 394 } 395 396 /* valid client */ 397 void iwpm_set_registration(u8 nl_client, u32 reg) 398 { 399 iwpm_admin.reg_list[nl_client] = reg; 400 } 401 402 /* valid client */ 403 u32 iwpm_check_registration(u8 nl_client, u32 reg) 404 { 405 return (iwpm_get_registration(nl_client) & reg); 406 } 407 408 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr, 409 struct sockaddr_storage *b_sockaddr) 410 { 411 if (a_sockaddr->ss_family != b_sockaddr->ss_family) 412 return 1; 413 if (a_sockaddr->ss_family == AF_INET) { 414 struct sockaddr_in *a4_sockaddr = 415 (struct sockaddr_in *)a_sockaddr; 416 struct sockaddr_in *b4_sockaddr = 417 (struct sockaddr_in *)b_sockaddr; 418 if (!memcmp(&a4_sockaddr->sin_addr, 419 &b4_sockaddr->sin_addr, sizeof(struct in_addr)) 420 && a4_sockaddr->sin_port == b4_sockaddr->sin_port) 421 return 0; 422 423 } else if (a_sockaddr->ss_family == AF_INET6) { 424 struct sockaddr_in6 *a6_sockaddr = 425 (struct sockaddr_in6 *)a_sockaddr; 426 struct sockaddr_in6 *b6_sockaddr = 427 (struct sockaddr_in6 *)b_sockaddr; 428 if (!memcmp(&a6_sockaddr->sin6_addr, 429 &b6_sockaddr->sin6_addr, sizeof(struct in6_addr)) 430 && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port) 431 return 0; 432 433 } else { 434 pr_err("%s: Invalid sockaddr family\n", __func__); 435 } 436 return 1; 437 } 438 439 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh, 440 int nl_client) 441 { 442 struct sk_buff *skb = NULL; 443 444 skb = dev_alloc_skb(IWPM_MSG_SIZE); 445 if (!skb) 446 goto create_nlmsg_exit; 447 448 if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op, 449 NLM_F_REQUEST))) { 450 pr_warn("%s: Unable to put the nlmsg header\n", __func__); 451 dev_kfree_skb(skb); 452 skb = NULL; 453 } 454 create_nlmsg_exit: 455 return skb; 456 } 457 458 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max, 459 const struct nla_policy *nlmsg_policy, 460 struct nlattr *nltb[], const char *msg_type) 461 { 462 int nlh_len = 0; 463 int ret; 464 const char *err_str = ""; 465 466 ret = nlmsg_validate_deprecated(cb->nlh, nlh_len, policy_max - 1, 467 nlmsg_policy, NULL); 468 if (ret) { 469 err_str = "Invalid attribute"; 470 goto parse_nlmsg_error; 471 } 472 ret = nlmsg_parse_deprecated(cb->nlh, nlh_len, nltb, policy_max - 1, 473 nlmsg_policy, NULL); 474 if (ret) { 475 err_str = "Unable to parse the nlmsg"; 476 goto parse_nlmsg_error; 477 } 478 ret = iwpm_validate_nlmsg_attr(nltb, policy_max); 479 if (ret) { 480 err_str = "Invalid NULL attribute"; 481 goto parse_nlmsg_error; 482 } 483 return 0; 484 parse_nlmsg_error: 485 pr_warn("%s: %s (msg type %s ret = %d)\n", 486 __func__, err_str, msg_type, ret); 487 return ret; 488 } 489 490 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg) 491 { 492 struct sockaddr_in6 *sockaddr_v6; 493 struct sockaddr_in *sockaddr_v4; 494 495 switch (sockaddr->ss_family) { 496 case AF_INET: 497 sockaddr_v4 = (struct sockaddr_in *)sockaddr; 498 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n", 499 msg, &sockaddr_v4->sin_addr, 500 ntohs(sockaddr_v4->sin_port), 501 ntohs(sockaddr_v4->sin_port)); 502 break; 503 case AF_INET6: 504 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr; 505 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n", 506 msg, &sockaddr_v6->sin6_addr, 507 ntohs(sockaddr_v6->sin6_port), 508 ntohs(sockaddr_v6->sin6_port)); 509 break; 510 default: 511 break; 512 } 513 } 514 515 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr) 516 { 517 u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0); 518 u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0); 519 return hash; 520 } 521 522 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr) 523 { 524 u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0); 525 u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0); 526 return hash; 527 } 528 529 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr, 530 struct sockaddr_storage *b_sockaddr, u32 *hash) 531 { 532 u32 a_hash, b_hash; 533 534 if (a_sockaddr->ss_family == AF_INET) { 535 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr); 536 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr); 537 538 } else if (a_sockaddr->ss_family == AF_INET6) { 539 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr); 540 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr); 541 } else { 542 pr_err("%s: Invalid sockaddr family\n", __func__); 543 return -EINVAL; 544 } 545 546 if (a_hash == b_hash) /* if port mapper isn't available */ 547 *hash = a_hash; 548 else 549 *hash = jhash_2words(a_hash, b_hash, 0); 550 return 0; 551 } 552 553 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage 554 *local_sockaddr, struct sockaddr_storage 555 *mapped_sockaddr) 556 { 557 u32 hash; 558 int ret; 559 560 ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash); 561 if (ret) 562 return NULL; 563 return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK]; 564 } 565 566 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage 567 *mapped_loc_sockaddr, struct sockaddr_storage 568 *mapped_rem_sockaddr) 569 { 570 u32 hash; 571 int ret; 572 573 ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash); 574 if (ret) 575 return NULL; 576 return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK]; 577 } 578 579 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid) 580 { 581 struct sk_buff *skb = NULL; 582 struct nlmsghdr *nlh; 583 u32 msg_seq; 584 const char *err_str = ""; 585 int ret = -EINVAL; 586 587 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client); 588 if (!skb) { 589 err_str = "Unable to create a nlmsg"; 590 goto mapinfo_num_error; 591 } 592 nlh->nlmsg_seq = iwpm_get_nlmsg_seq(); 593 msg_seq = 0; 594 err_str = "Unable to put attribute of mapinfo number nlmsg"; 595 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ); 596 if (ret) 597 goto mapinfo_num_error; 598 ret = ibnl_put_attr(skb, nlh, sizeof(u32), 599 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM); 600 if (ret) 601 goto mapinfo_num_error; 602 603 nlmsg_end(skb, nlh); 604 605 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid); 606 if (ret) { 607 skb = NULL; 608 err_str = "Unable to send a nlmsg"; 609 goto mapinfo_num_error; 610 } 611 pr_debug("%s: Sent mapping number = %u\n", __func__, mapping_num); 612 return 0; 613 mapinfo_num_error: 614 pr_info("%s: %s\n", __func__, err_str); 615 dev_kfree_skb(skb); 616 return ret; 617 } 618 619 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid) 620 { 621 struct nlmsghdr *nlh = NULL; 622 int ret = 0; 623 624 if (!skb) 625 return ret; 626 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client, 627 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) { 628 pr_warn("%s Unable to put NLMSG_DONE\n", __func__); 629 dev_kfree_skb(skb); 630 return -ENOMEM; 631 } 632 nlh->nlmsg_type = NLMSG_DONE; 633 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid); 634 if (ret) 635 pr_warn("%s Unable to send a nlmsg\n", __func__); 636 return ret; 637 } 638 639 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid) 640 { 641 struct iwpm_mapping_info *map_info; 642 struct sk_buff *skb = NULL; 643 struct nlmsghdr *nlh; 644 int skb_num = 0, mapping_num = 0; 645 int i = 0, nlmsg_bytes = 0; 646 unsigned long flags; 647 const char *err_str = ""; 648 int ret; 649 650 skb = dev_alloc_skb(NLMSG_GOODSIZE); 651 if (!skb) { 652 ret = -ENOMEM; 653 err_str = "Unable to allocate skb"; 654 goto send_mapping_info_exit; 655 } 656 skb_num++; 657 spin_lock_irqsave(&iwpm_mapinfo_lock, flags); 658 ret = -EINVAL; 659 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) { 660 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i], 661 hlist_node) { 662 if (map_info->nl_client != nl_client) 663 continue; 664 nlh = NULL; 665 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client, 666 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) { 667 ret = -ENOMEM; 668 err_str = "Unable to put the nlmsg header"; 669 goto send_mapping_info_unlock; 670 } 671 err_str = "Unable to put attribute of the nlmsg"; 672 ret = ibnl_put_attr(skb, nlh, 673 sizeof(struct sockaddr_storage), 674 &map_info->local_sockaddr, 675 IWPM_NLA_MAPINFO_LOCAL_ADDR); 676 if (ret) 677 goto send_mapping_info_unlock; 678 679 ret = ibnl_put_attr(skb, nlh, 680 sizeof(struct sockaddr_storage), 681 &map_info->mapped_sockaddr, 682 IWPM_NLA_MAPINFO_MAPPED_ADDR); 683 if (ret) 684 goto send_mapping_info_unlock; 685 686 if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) { 687 ret = ibnl_put_attr(skb, nlh, sizeof(u32), 688 &map_info->map_flags, 689 IWPM_NLA_MAPINFO_FLAGS); 690 if (ret) 691 goto send_mapping_info_unlock; 692 } 693 694 nlmsg_end(skb, nlh); 695 696 iwpm_print_sockaddr(&map_info->local_sockaddr, 697 "send_mapping_info: Local sockaddr:"); 698 iwpm_print_sockaddr(&map_info->mapped_sockaddr, 699 "send_mapping_info: Mapped local sockaddr:"); 700 mapping_num++; 701 nlmsg_bytes += nlh->nlmsg_len; 702 703 /* check if all mappings can fit in one skb */ 704 if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) { 705 /* and leave room for NLMSG_DONE */ 706 nlmsg_bytes = 0; 707 skb_num++; 708 spin_unlock_irqrestore(&iwpm_mapinfo_lock, 709 flags); 710 /* send the skb */ 711 ret = send_nlmsg_done(skb, nl_client, iwpm_pid); 712 skb = NULL; 713 if (ret) { 714 err_str = "Unable to send map info"; 715 goto send_mapping_info_exit; 716 } 717 if (skb_num == IWPM_MAPINFO_SKB_COUNT) { 718 ret = -ENOMEM; 719 err_str = "Insufficient skbs for map info"; 720 goto send_mapping_info_exit; 721 } 722 skb = dev_alloc_skb(NLMSG_GOODSIZE); 723 if (!skb) { 724 ret = -ENOMEM; 725 err_str = "Unable to allocate skb"; 726 goto send_mapping_info_exit; 727 } 728 spin_lock_irqsave(&iwpm_mapinfo_lock, flags); 729 } 730 } 731 } 732 send_mapping_info_unlock: 733 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); 734 send_mapping_info_exit: 735 if (ret) { 736 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret); 737 dev_kfree_skb(skb); 738 return ret; 739 } 740 send_nlmsg_done(skb, nl_client, iwpm_pid); 741 return send_mapinfo_num(mapping_num, nl_client, iwpm_pid); 742 } 743 744 int iwpm_mapinfo_available(void) 745 { 746 unsigned long flags; 747 int full_bucket = 0, i = 0; 748 749 spin_lock_irqsave(&iwpm_mapinfo_lock, flags); 750 if (iwpm_hash_bucket) { 751 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) { 752 if (!hlist_empty(&iwpm_hash_bucket[i])) { 753 full_bucket = 1; 754 break; 755 } 756 } 757 } 758 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); 759 return full_bucket; 760 } 761 762 int iwpm_send_hello(u8 nl_client, int iwpm_pid, u16 abi_version) 763 { 764 struct sk_buff *skb = NULL; 765 struct nlmsghdr *nlh; 766 const char *err_str; 767 int ret = -EINVAL; 768 769 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_HELLO, &nlh, nl_client); 770 if (!skb) { 771 err_str = "Unable to create a nlmsg"; 772 goto hello_num_error; 773 } 774 nlh->nlmsg_seq = iwpm_get_nlmsg_seq(); 775 err_str = "Unable to put attribute of abi_version into nlmsg"; 776 ret = ibnl_put_attr(skb, nlh, sizeof(u16), &abi_version, 777 IWPM_NLA_HELLO_ABI_VERSION); 778 if (ret) 779 goto hello_num_error; 780 nlmsg_end(skb, nlh); 781 782 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid); 783 if (ret) { 784 skb = NULL; 785 err_str = "Unable to send a nlmsg"; 786 goto hello_num_error; 787 } 788 pr_debug("%s: Sent hello abi_version = %u\n", __func__, abi_version); 789 return 0; 790 hello_num_error: 791 pr_info("%s: %s\n", __func__, err_str); 792 dev_kfree_skb(skb); 793 return ret; 794 } 795