794 lines · 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 two6 * licenses. You may choose to be licensed under the terms of the GNU7 * General Public License (GPL) Version 2, available from the file8 * COPYING in the main directory of this source tree, or the9 * OpenIB.org BSD license below:10 *11 * Redistribution and use in source and binary forms, with or12 * without modification, are permitted provided that the following13 * conditions are met:14 *15 * - Redistributions of source code must retain the above16 * copyright notice, this list of conditions and the following17 * disclaimer.18 *19 * - Redistributions in binary form must reproduce the above20 * copyright notice, this list of conditions and the following21 * disclaimer in the documentation and/or other materials22 * 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 OF26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE31 * SOFTWARE.32 */33 34#include "iwpm_util.h"35 36#define IWPM_MAPINFO_HASH_SIZE 51237#define IWPM_MAPINFO_HASH_MASK (IWPM_MAPINFO_HASH_SIZE - 1)38#define IWPM_REMINFO_HASH_SIZE 6439#define IWPM_REMINFO_HASH_MASK (IWPM_REMINFO_HASH_SIZE - 1)40#define IWPM_MSG_SIZE 51241 42static LIST_HEAD(iwpm_nlmsg_req_list);43static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);44 45static struct hlist_head *iwpm_hash_bucket;46static DEFINE_SPINLOCK(iwpm_mapinfo_lock);47 48static struct hlist_head *iwpm_reminfo_bucket;49static DEFINE_SPINLOCK(iwpm_reminfo_lock);50 51static struct iwpm_admin_data iwpm_admin;52 53/**54 * iwpm_init - Allocate resources for the iwarp port mapper55 * @nl_client: The index of the netlink client56 *57 * Should be called when network interface goes up.58 */59int 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 78static void free_hash_bucket(void);79static void free_reminfo_bucket(void);80 81/**82 * iwpm_exit - Deallocate resources for the iwarp port mapper83 * @nl_client: The index of the netlink client84 *85 * Should be called when network interface goes down.86 */87int 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 96static 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 address101 * info in a hash table102 * @local_sockaddr: Local ip/tcp address103 * @mapped_sockaddr: Mapped local ip/tcp address104 * @nl_client: The index of the netlink client105 * @map_flags: IWPM mapping flags106 */107int 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 address146 * info from the hash table147 * @local_sockaddr: Local ip/tcp address148 * @mapped_local_addr: Mapped local ip/tcp address149 *150 * Returns err code if mapping info is not found in the hash table,151 * otherwise returns 0152 */153int 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 }183remove_mapinfo_exit:184 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);185 return ret;186}187 188static 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 211static 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 234static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,235 struct sockaddr_storage *);236 237void 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 info255 *256 * @mapped_loc_addr: Mapped local address of the listening peer257 * @mapped_rem_addr: Mapped remote address of the connecting peer258 * @remote_addr: To store the remote address of the connecting peer259 * @nl_client: The index of the netlink client260 *261 * The remote address info is retrieved and provided to the client in262 * the remote_addr. After that it is removed from the hash table263 */264int 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 }302get_remote_info_exit:303 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);304 return ret;305}306 307struct 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(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 332void 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 349struct 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 368int 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 384int iwpm_get_nlmsg_seq(void)385{386 return atomic_inc_return(&iwpm_admin.nlmsg_seq);387}388 389/* valid client */390u32 iwpm_get_registration(u8 nl_client)391{392 return iwpm_admin.reg_list[nl_client];393}394 395/* valid client */396void iwpm_set_registration(u8 nl_client, u32 reg)397{398 iwpm_admin.reg_list[nl_client] = reg;399}400 401/* valid client */402u32 iwpm_check_registration(u8 nl_client, u32 reg)403{404 return (iwpm_get_registration(nl_client) & reg);405}406 407int 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 438struct 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 }453create_nlmsg_exit:454 return skb;455}456 457int 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;483parse_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 489void 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 514static 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 521static 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 528static 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 else548 *hash = jhash_2words(a_hash, b_hash, 0);549 return 0;550}551 552static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage553 *local_sockaddr, struct sockaddr_storage554 *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 565static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage566 *mapped_loc_sockaddr, struct sockaddr_storage567 *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 578static 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;612mapinfo_num_error:613 pr_info("%s: %s\n", __func__, err_str);614 dev_kfree_skb(skb);615 return ret;616}617 618static 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 638int 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 }731send_mapping_info_unlock:732 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);733send_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 743int 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 761int 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;789hello_num_error:790 pr_info("%s: %s\n", __func__, err_str);791 dev_kfree_skb(skb);792 return ret;793}794