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 = kcalloc(IWPM_MAPINFO_HASH_SIZE, 62 sizeof(struct hlist_head), GFP_KERNEL); 63 if (!iwpm_hash_bucket) 64 return -ENOMEM; 65 66 iwpm_reminfo_bucket = kcalloc(IWPM_REMINFO_HASH_SIZE, 67 sizeof(struct hlist_head), GFP_KERNEL); 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(sizeof(struct iwpm_mapping_info), GFP_KERNEL); 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 = NULL; 311 unsigned long flags; 312 313 nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp); 314 if (!nlmsg_request) 315 return NULL; 316 317 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags); 318 list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list); 319 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags); 320 321 kref_init(&nlmsg_request->kref); 322 kref_get(&nlmsg_request->kref); 323 nlmsg_request->nlmsg_seq = nlmsg_seq; 324 nlmsg_request->nl_client = nl_client; 325 nlmsg_request->request_done = 0; 326 nlmsg_request->err_code = 0; 327 sema_init(&nlmsg_request->sem, 1); 328 down(&nlmsg_request->sem); 329 return nlmsg_request; 330 } 331 332 void iwpm_free_nlmsg_request(struct kref *kref) 333 { 334 struct iwpm_nlmsg_request *nlmsg_request; 335 unsigned long flags; 336 337 nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref); 338 339 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags); 340 list_del_init(&nlmsg_request->inprocess_list); 341 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags); 342 343 if (!nlmsg_request->request_done) 344 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n", 345 __func__, nlmsg_request->nlmsg_seq); 346 kfree(nlmsg_request); 347 } 348 349 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq) 350 { 351 struct iwpm_nlmsg_request *nlmsg_request; 352 struct iwpm_nlmsg_request *found_request = NULL; 353 unsigned long flags; 354 355 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags); 356 list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list, 357 inprocess_list) { 358 if (nlmsg_request->nlmsg_seq == echo_seq) { 359 found_request = nlmsg_request; 360 kref_get(&nlmsg_request->kref); 361 break; 362 } 363 } 364 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags); 365 return found_request; 366 } 367 368 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request) 369 { 370 int ret; 371 372 ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT); 373 if (ret) { 374 ret = -EINVAL; 375 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n", 376 __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq); 377 } else { 378 ret = nlmsg_request->err_code; 379 } 380 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request); 381 return ret; 382 } 383 384 int iwpm_get_nlmsg_seq(void) 385 { 386 return atomic_inc_return(&iwpm_admin.nlmsg_seq); 387 } 388 389 /* valid client */ 390 u32 iwpm_get_registration(u8 nl_client) 391 { 392 return iwpm_admin.reg_list[nl_client]; 393 } 394 395 /* valid client */ 396 void iwpm_set_registration(u8 nl_client, u32 reg) 397 { 398 iwpm_admin.reg_list[nl_client] = reg; 399 } 400 401 /* valid client */ 402 u32 iwpm_check_registration(u8 nl_client, u32 reg) 403 { 404 return (iwpm_get_registration(nl_client) & reg); 405 } 406 407 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr, 408 struct sockaddr_storage *b_sockaddr) 409 { 410 if (a_sockaddr->ss_family != b_sockaddr->ss_family) 411 return 1; 412 if (a_sockaddr->ss_family == AF_INET) { 413 struct sockaddr_in *a4_sockaddr = 414 (struct sockaddr_in *)a_sockaddr; 415 struct sockaddr_in *b4_sockaddr = 416 (struct sockaddr_in *)b_sockaddr; 417 if (!memcmp(&a4_sockaddr->sin_addr, 418 &b4_sockaddr->sin_addr, sizeof(struct in_addr)) 419 && a4_sockaddr->sin_port == b4_sockaddr->sin_port) 420 return 0; 421 422 } else if (a_sockaddr->ss_family == AF_INET6) { 423 struct sockaddr_in6 *a6_sockaddr = 424 (struct sockaddr_in6 *)a_sockaddr; 425 struct sockaddr_in6 *b6_sockaddr = 426 (struct sockaddr_in6 *)b_sockaddr; 427 if (!memcmp(&a6_sockaddr->sin6_addr, 428 &b6_sockaddr->sin6_addr, sizeof(struct in6_addr)) 429 && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port) 430 return 0; 431 432 } else { 433 pr_err("%s: Invalid sockaddr family\n", __func__); 434 } 435 return 1; 436 } 437 438 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh, 439 int nl_client) 440 { 441 struct sk_buff *skb = NULL; 442 443 skb = dev_alloc_skb(IWPM_MSG_SIZE); 444 if (!skb) 445 goto create_nlmsg_exit; 446 447 if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op, 448 NLM_F_REQUEST))) { 449 pr_warn("%s: Unable to put the nlmsg header\n", __func__); 450 dev_kfree_skb(skb); 451 skb = NULL; 452 } 453 create_nlmsg_exit: 454 return skb; 455 } 456 457 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max, 458 const struct nla_policy *nlmsg_policy, 459 struct nlattr *nltb[], const char *msg_type) 460 { 461 int nlh_len = 0; 462 int ret; 463 const char *err_str = ""; 464 465 ret = nlmsg_validate_deprecated(cb->nlh, nlh_len, policy_max - 1, 466 nlmsg_policy, NULL); 467 if (ret) { 468 err_str = "Invalid attribute"; 469 goto parse_nlmsg_error; 470 } 471 ret = nlmsg_parse_deprecated(cb->nlh, nlh_len, nltb, policy_max - 1, 472 nlmsg_policy, NULL); 473 if (ret) { 474 err_str = "Unable to parse the nlmsg"; 475 goto parse_nlmsg_error; 476 } 477 ret = iwpm_validate_nlmsg_attr(nltb, policy_max); 478 if (ret) { 479 err_str = "Invalid NULL attribute"; 480 goto parse_nlmsg_error; 481 } 482 return 0; 483 parse_nlmsg_error: 484 pr_warn("%s: %s (msg type %s ret = %d)\n", 485 __func__, err_str, msg_type, ret); 486 return ret; 487 } 488 489 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg) 490 { 491 struct sockaddr_in6 *sockaddr_v6; 492 struct sockaddr_in *sockaddr_v4; 493 494 switch (sockaddr->ss_family) { 495 case AF_INET: 496 sockaddr_v4 = (struct sockaddr_in *)sockaddr; 497 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n", 498 msg, &sockaddr_v4->sin_addr, 499 ntohs(sockaddr_v4->sin_port), 500 ntohs(sockaddr_v4->sin_port)); 501 break; 502 case AF_INET6: 503 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr; 504 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n", 505 msg, &sockaddr_v6->sin6_addr, 506 ntohs(sockaddr_v6->sin6_port), 507 ntohs(sockaddr_v6->sin6_port)); 508 break; 509 default: 510 break; 511 } 512 } 513 514 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr) 515 { 516 u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0); 517 u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0); 518 return hash; 519 } 520 521 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr) 522 { 523 u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0); 524 u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0); 525 return hash; 526 } 527 528 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr, 529 struct sockaddr_storage *b_sockaddr, u32 *hash) 530 { 531 u32 a_hash, b_hash; 532 533 if (a_sockaddr->ss_family == AF_INET) { 534 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr); 535 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr); 536 537 } else if (a_sockaddr->ss_family == AF_INET6) { 538 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr); 539 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr); 540 } else { 541 pr_err("%s: Invalid sockaddr family\n", __func__); 542 return -EINVAL; 543 } 544 545 if (a_hash == b_hash) /* if port mapper isn't available */ 546 *hash = a_hash; 547 else 548 *hash = jhash_2words(a_hash, b_hash, 0); 549 return 0; 550 } 551 552 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage 553 *local_sockaddr, struct sockaddr_storage 554 *mapped_sockaddr) 555 { 556 u32 hash; 557 int ret; 558 559 ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash); 560 if (ret) 561 return NULL; 562 return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK]; 563 } 564 565 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage 566 *mapped_loc_sockaddr, struct sockaddr_storage 567 *mapped_rem_sockaddr) 568 { 569 u32 hash; 570 int ret; 571 572 ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash); 573 if (ret) 574 return NULL; 575 return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK]; 576 } 577 578 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid) 579 { 580 struct sk_buff *skb = NULL; 581 struct nlmsghdr *nlh; 582 u32 msg_seq; 583 const char *err_str = ""; 584 int ret = -EINVAL; 585 586 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client); 587 if (!skb) { 588 err_str = "Unable to create a nlmsg"; 589 goto mapinfo_num_error; 590 } 591 nlh->nlmsg_seq = iwpm_get_nlmsg_seq(); 592 msg_seq = 0; 593 err_str = "Unable to put attribute of mapinfo number nlmsg"; 594 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ); 595 if (ret) 596 goto mapinfo_num_error; 597 ret = ibnl_put_attr(skb, nlh, sizeof(u32), 598 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM); 599 if (ret) 600 goto mapinfo_num_error; 601 602 nlmsg_end(skb, nlh); 603 604 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid); 605 if (ret) { 606 skb = NULL; 607 err_str = "Unable to send a nlmsg"; 608 goto mapinfo_num_error; 609 } 610 pr_debug("%s: Sent mapping number = %u\n", __func__, mapping_num); 611 return 0; 612 mapinfo_num_error: 613 pr_info("%s: %s\n", __func__, err_str); 614 dev_kfree_skb(skb); 615 return ret; 616 } 617 618 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid) 619 { 620 struct nlmsghdr *nlh = NULL; 621 int ret = 0; 622 623 if (!skb) 624 return ret; 625 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client, 626 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) { 627 pr_warn("%s Unable to put NLMSG_DONE\n", __func__); 628 dev_kfree_skb(skb); 629 return -ENOMEM; 630 } 631 nlh->nlmsg_type = NLMSG_DONE; 632 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid); 633 if (ret) 634 pr_warn("%s Unable to send a nlmsg\n", __func__); 635 return ret; 636 } 637 638 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid) 639 { 640 struct iwpm_mapping_info *map_info; 641 struct sk_buff *skb = NULL; 642 struct nlmsghdr *nlh; 643 int skb_num = 0, mapping_num = 0; 644 int i = 0, nlmsg_bytes = 0; 645 unsigned long flags; 646 const char *err_str = ""; 647 int ret; 648 649 skb = dev_alloc_skb(NLMSG_GOODSIZE); 650 if (!skb) { 651 ret = -ENOMEM; 652 err_str = "Unable to allocate skb"; 653 goto send_mapping_info_exit; 654 } 655 skb_num++; 656 spin_lock_irqsave(&iwpm_mapinfo_lock, flags); 657 ret = -EINVAL; 658 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) { 659 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i], 660 hlist_node) { 661 if (map_info->nl_client != nl_client) 662 continue; 663 nlh = NULL; 664 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client, 665 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) { 666 ret = -ENOMEM; 667 err_str = "Unable to put the nlmsg header"; 668 goto send_mapping_info_unlock; 669 } 670 err_str = "Unable to put attribute of the nlmsg"; 671 ret = ibnl_put_attr(skb, nlh, 672 sizeof(struct sockaddr_storage), 673 &map_info->local_sockaddr, 674 IWPM_NLA_MAPINFO_LOCAL_ADDR); 675 if (ret) 676 goto send_mapping_info_unlock; 677 678 ret = ibnl_put_attr(skb, nlh, 679 sizeof(struct sockaddr_storage), 680 &map_info->mapped_sockaddr, 681 IWPM_NLA_MAPINFO_MAPPED_ADDR); 682 if (ret) 683 goto send_mapping_info_unlock; 684 685 if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) { 686 ret = ibnl_put_attr(skb, nlh, sizeof(u32), 687 &map_info->map_flags, 688 IWPM_NLA_MAPINFO_FLAGS); 689 if (ret) 690 goto send_mapping_info_unlock; 691 } 692 693 nlmsg_end(skb, nlh); 694 695 iwpm_print_sockaddr(&map_info->local_sockaddr, 696 "send_mapping_info: Local sockaddr:"); 697 iwpm_print_sockaddr(&map_info->mapped_sockaddr, 698 "send_mapping_info: Mapped local sockaddr:"); 699 mapping_num++; 700 nlmsg_bytes += nlh->nlmsg_len; 701 702 /* check if all mappings can fit in one skb */ 703 if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) { 704 /* and leave room for NLMSG_DONE */ 705 nlmsg_bytes = 0; 706 skb_num++; 707 spin_unlock_irqrestore(&iwpm_mapinfo_lock, 708 flags); 709 /* send the skb */ 710 ret = send_nlmsg_done(skb, nl_client, iwpm_pid); 711 skb = NULL; 712 if (ret) { 713 err_str = "Unable to send map info"; 714 goto send_mapping_info_exit; 715 } 716 if (skb_num == IWPM_MAPINFO_SKB_COUNT) { 717 ret = -ENOMEM; 718 err_str = "Insufficient skbs for map info"; 719 goto send_mapping_info_exit; 720 } 721 skb = dev_alloc_skb(NLMSG_GOODSIZE); 722 if (!skb) { 723 ret = -ENOMEM; 724 err_str = "Unable to allocate skb"; 725 goto send_mapping_info_exit; 726 } 727 spin_lock_irqsave(&iwpm_mapinfo_lock, flags); 728 } 729 } 730 } 731 send_mapping_info_unlock: 732 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); 733 send_mapping_info_exit: 734 if (ret) { 735 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret); 736 dev_kfree_skb(skb); 737 return ret; 738 } 739 send_nlmsg_done(skb, nl_client, iwpm_pid); 740 return send_mapinfo_num(mapping_num, nl_client, iwpm_pid); 741 } 742 743 int iwpm_mapinfo_available(void) 744 { 745 unsigned long flags; 746 int full_bucket = 0, i = 0; 747 748 spin_lock_irqsave(&iwpm_mapinfo_lock, flags); 749 if (iwpm_hash_bucket) { 750 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) { 751 if (!hlist_empty(&iwpm_hash_bucket[i])) { 752 full_bucket = 1; 753 break; 754 } 755 } 756 } 757 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); 758 return full_bucket; 759 } 760 761 int iwpm_send_hello(u8 nl_client, int iwpm_pid, u16 abi_version) 762 { 763 struct sk_buff *skb = NULL; 764 struct nlmsghdr *nlh; 765 const char *err_str; 766 int ret = -EINVAL; 767 768 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_HELLO, &nlh, nl_client); 769 if (!skb) { 770 err_str = "Unable to create a nlmsg"; 771 goto hello_num_error; 772 } 773 nlh->nlmsg_seq = iwpm_get_nlmsg_seq(); 774 err_str = "Unable to put attribute of abi_version into nlmsg"; 775 ret = ibnl_put_attr(skb, nlh, sizeof(u16), &abi_version, 776 IWPM_NLA_HELLO_ABI_VERSION); 777 if (ret) 778 goto hello_num_error; 779 nlmsg_end(skb, nlh); 780 781 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid); 782 if (ret) { 783 skb = NULL; 784 err_str = "Unable to send a nlmsg"; 785 goto hello_num_error; 786 } 787 pr_debug("%s: Sent hello abi_version = %u\n", __func__, abi_version); 788 return 0; 789 hello_num_error: 790 pr_info("%s: %s\n", __func__, err_str); 791 dev_kfree_skb(skb); 792 return ret; 793 } 794