2 * Copyright (c) 2014 Chelsio, Inc. All rights reserved.
3 * Copyright (c) 2014 Intel Corporation. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
34 #include "iwpm_util.h"
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
42 static LIST_HEAD(iwpm_nlmsg_req_list);
43 static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
45 static struct hlist_head *iwpm_hash_bucket;
46 static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
48 static struct hlist_head *iwpm_reminfo_bucket;
49 static DEFINE_SPINLOCK(iwpm_reminfo_lock);
51 static DEFINE_MUTEX(iwpm_admin_lock);
52 static struct iwpm_admin_data iwpm_admin;
54 int iwpm_init(u8 nl_client)
57 if (iwpm_valid_client(nl_client))
59 mutex_lock(&iwpm_admin_lock);
60 if (atomic_read(&iwpm_admin.refcount) == 0) {
61 iwpm_hash_bucket = kzalloc(IWPM_MAPINFO_HASH_SIZE *
62 sizeof(struct hlist_head), GFP_KERNEL);
63 if (!iwpm_hash_bucket) {
65 pr_err("%s Unable to create mapinfo hash table\n", __func__);
68 iwpm_reminfo_bucket = kzalloc(IWPM_REMINFO_HASH_SIZE *
69 sizeof(struct hlist_head), GFP_KERNEL);
70 if (!iwpm_reminfo_bucket) {
71 kfree(iwpm_hash_bucket);
73 pr_err("%s Unable to create reminfo hash table\n", __func__);
77 atomic_inc(&iwpm_admin.refcount);
79 mutex_unlock(&iwpm_admin_lock);
81 iwpm_set_valid(nl_client, 1);
82 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
83 pr_debug("%s: Mapinfo and reminfo tables are created\n",
88 EXPORT_SYMBOL(iwpm_init);
90 static void free_hash_bucket(void);
91 static void free_reminfo_bucket(void);
93 int iwpm_exit(u8 nl_client)
96 if (!iwpm_valid_client(nl_client))
98 mutex_lock(&iwpm_admin_lock);
99 if (atomic_read(&iwpm_admin.refcount) == 0) {
100 mutex_unlock(&iwpm_admin_lock);
101 pr_err("%s Incorrect usage - negative refcount\n", __func__);
104 if (atomic_dec_and_test(&iwpm_admin.refcount)) {
106 free_reminfo_bucket();
107 pr_debug("%s: Resources are destroyed\n", __func__);
109 mutex_unlock(&iwpm_admin_lock);
110 iwpm_set_valid(nl_client, 0);
111 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
114 EXPORT_SYMBOL(iwpm_exit);
116 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
117 struct sockaddr_storage *);
119 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
120 struct sockaddr_storage *mapped_sockaddr,
123 struct hlist_head *hash_bucket_head;
124 struct iwpm_mapping_info *map_info;
128 if (!iwpm_valid_client(nl_client))
130 map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
132 pr_err("%s: Unable to allocate a mapping info\n", __func__);
135 memcpy(&map_info->local_sockaddr, local_sockaddr,
136 sizeof(struct sockaddr_storage));
137 memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
138 sizeof(struct sockaddr_storage));
139 map_info->nl_client = nl_client;
141 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
142 if (iwpm_hash_bucket) {
143 hash_bucket_head = get_mapinfo_hash_bucket(
144 &map_info->local_sockaddr,
145 &map_info->mapped_sockaddr);
146 if (hash_bucket_head) {
147 hlist_add_head(&map_info->hlist_node, hash_bucket_head);
151 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
154 EXPORT_SYMBOL(iwpm_create_mapinfo);
156 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
157 struct sockaddr_storage *mapped_local_addr)
159 struct hlist_node *tmp_hlist_node;
160 struct hlist_head *hash_bucket_head;
161 struct iwpm_mapping_info *map_info = NULL;
165 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
166 if (iwpm_hash_bucket) {
167 hash_bucket_head = get_mapinfo_hash_bucket(
170 if (!hash_bucket_head)
171 goto remove_mapinfo_exit;
173 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
174 hash_bucket_head, hlist_node) {
176 if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
177 mapped_local_addr)) {
179 hlist_del_init(&map_info->hlist_node);
187 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
190 EXPORT_SYMBOL(iwpm_remove_mapinfo);
192 static void free_hash_bucket(void)
194 struct hlist_node *tmp_hlist_node;
195 struct iwpm_mapping_info *map_info;
199 /* remove all the mapinfo data from the list */
200 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
201 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
202 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
203 &iwpm_hash_bucket[i], hlist_node) {
205 hlist_del_init(&map_info->hlist_node);
209 /* free the hash list */
210 kfree(iwpm_hash_bucket);
211 iwpm_hash_bucket = NULL;
212 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
215 static void free_reminfo_bucket(void)
217 struct hlist_node *tmp_hlist_node;
218 struct iwpm_remote_info *rem_info;
222 /* remove all the remote info from the list */
223 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
224 for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
225 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
226 &iwpm_reminfo_bucket[i], hlist_node) {
228 hlist_del_init(&rem_info->hlist_node);
232 /* free the hash list */
233 kfree(iwpm_reminfo_bucket);
234 iwpm_reminfo_bucket = NULL;
235 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
238 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
239 struct sockaddr_storage *);
241 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
243 struct hlist_head *hash_bucket_head;
246 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
247 if (iwpm_reminfo_bucket) {
248 hash_bucket_head = get_reminfo_hash_bucket(
249 &rem_info->mapped_loc_sockaddr,
250 &rem_info->mapped_rem_sockaddr);
251 if (hash_bucket_head)
252 hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
254 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
257 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
258 struct sockaddr_storage *mapped_rem_addr,
259 struct sockaddr_storage *remote_addr,
262 struct hlist_node *tmp_hlist_node;
263 struct hlist_head *hash_bucket_head;
264 struct iwpm_remote_info *rem_info = NULL;
268 if (!iwpm_valid_client(nl_client)) {
269 pr_info("%s: Invalid client = %d\n", __func__, nl_client);
272 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
273 if (iwpm_reminfo_bucket) {
274 hash_bucket_head = get_reminfo_hash_bucket(
277 if (!hash_bucket_head)
278 goto get_remote_info_exit;
279 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
280 hash_bucket_head, hlist_node) {
282 if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
284 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
287 memcpy(remote_addr, &rem_info->remote_sockaddr,
288 sizeof(struct sockaddr_storage));
289 iwpm_print_sockaddr(remote_addr,
290 "get_remote_info: Remote sockaddr:");
292 hlist_del_init(&rem_info->hlist_node);
299 get_remote_info_exit:
300 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
303 EXPORT_SYMBOL(iwpm_get_remote_info);
305 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
306 u8 nl_client, gfp_t gfp)
308 struct iwpm_nlmsg_request *nlmsg_request = NULL;
311 nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
312 if (!nlmsg_request) {
313 pr_err("%s Unable to allocate a nlmsg_request\n", __func__);
316 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
317 list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
318 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
320 kref_init(&nlmsg_request->kref);
321 kref_get(&nlmsg_request->kref);
322 nlmsg_request->nlmsg_seq = nlmsg_seq;
323 nlmsg_request->nl_client = nl_client;
324 nlmsg_request->request_done = 0;
325 nlmsg_request->err_code = 0;
326 sema_init(&nlmsg_request->sem, 1);
327 down(&nlmsg_request->sem);
328 return nlmsg_request;
331 void iwpm_free_nlmsg_request(struct kref *kref)
333 struct iwpm_nlmsg_request *nlmsg_request;
336 nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
338 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
339 list_del_init(&nlmsg_request->inprocess_list);
340 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
342 if (!nlmsg_request->request_done)
343 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
344 __func__, nlmsg_request->nlmsg_seq);
345 kfree(nlmsg_request);
348 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
350 struct iwpm_nlmsg_request *nlmsg_request;
351 struct iwpm_nlmsg_request *found_request = NULL;
354 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
355 list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
357 if (nlmsg_request->nlmsg_seq == echo_seq) {
358 found_request = nlmsg_request;
359 kref_get(&nlmsg_request->kref);
363 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
364 return found_request;
367 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
371 ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
374 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
375 __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
377 ret = nlmsg_request->err_code;
379 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
383 int iwpm_get_nlmsg_seq(void)
385 return atomic_inc_return(&iwpm_admin.nlmsg_seq);
388 int iwpm_valid_client(u8 nl_client)
390 if (nl_client >= RDMA_NL_NUM_CLIENTS)
392 return iwpm_admin.client_list[nl_client];
395 void iwpm_set_valid(u8 nl_client, int valid)
397 if (nl_client >= RDMA_NL_NUM_CLIENTS)
399 iwpm_admin.client_list[nl_client] = valid;
403 u32 iwpm_get_registration(u8 nl_client)
405 return iwpm_admin.reg_list[nl_client];
409 void iwpm_set_registration(u8 nl_client, u32 reg)
411 iwpm_admin.reg_list[nl_client] = reg;
415 u32 iwpm_check_registration(u8 nl_client, u32 reg)
417 return (iwpm_get_registration(nl_client) & reg);
420 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
421 struct sockaddr_storage *b_sockaddr)
423 if (a_sockaddr->ss_family != b_sockaddr->ss_family)
425 if (a_sockaddr->ss_family == AF_INET) {
426 struct sockaddr_in *a4_sockaddr =
427 (struct sockaddr_in *)a_sockaddr;
428 struct sockaddr_in *b4_sockaddr =
429 (struct sockaddr_in *)b_sockaddr;
430 if (!memcmp(&a4_sockaddr->sin_addr,
431 &b4_sockaddr->sin_addr, sizeof(struct in_addr))
432 && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
435 } else if (a_sockaddr->ss_family == AF_INET6) {
436 struct sockaddr_in6 *a6_sockaddr =
437 (struct sockaddr_in6 *)a_sockaddr;
438 struct sockaddr_in6 *b6_sockaddr =
439 (struct sockaddr_in6 *)b_sockaddr;
440 if (!memcmp(&a6_sockaddr->sin6_addr,
441 &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
442 && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
446 pr_err("%s: Invalid sockaddr family\n", __func__);
451 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
454 struct sk_buff *skb = NULL;
456 skb = dev_alloc_skb(IWPM_MSG_SIZE);
458 pr_err("%s Unable to allocate skb\n", __func__);
459 goto create_nlmsg_exit;
461 if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
463 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
471 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
472 const struct nla_policy *nlmsg_policy,
473 struct nlattr *nltb[], const char *msg_type)
477 const char *err_str = "";
479 ret = nlmsg_validate(cb->nlh, nlh_len, policy_max-1, nlmsg_policy);
481 err_str = "Invalid attribute";
482 goto parse_nlmsg_error;
484 ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max-1, nlmsg_policy);
486 err_str = "Unable to parse the nlmsg";
487 goto parse_nlmsg_error;
489 ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
491 err_str = "Invalid NULL attribute";
492 goto parse_nlmsg_error;
496 pr_warn("%s: %s (msg type %s ret = %d)\n",
497 __func__, err_str, msg_type, ret);
501 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
503 struct sockaddr_in6 *sockaddr_v6;
504 struct sockaddr_in *sockaddr_v4;
506 switch (sockaddr->ss_family) {
508 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
509 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
510 msg, &sockaddr_v4->sin_addr,
511 ntohs(sockaddr_v4->sin_port),
512 ntohs(sockaddr_v4->sin_port));
515 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
516 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
517 msg, &sockaddr_v6->sin6_addr,
518 ntohs(sockaddr_v6->sin6_port),
519 ntohs(sockaddr_v6->sin6_port));
526 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
528 u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
529 u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
533 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
535 u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
536 u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
540 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
541 struct sockaddr_storage *b_sockaddr, u32 *hash)
545 if (a_sockaddr->ss_family == AF_INET) {
546 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
547 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
549 } else if (a_sockaddr->ss_family == AF_INET6) {
550 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
551 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
553 pr_err("%s: Invalid sockaddr family\n", __func__);
557 if (a_hash == b_hash) /* if port mapper isn't available */
560 *hash = jhash_2words(a_hash, b_hash, 0);
564 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
565 *local_sockaddr, struct sockaddr_storage
571 ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
574 return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
577 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
578 *mapped_loc_sockaddr, struct sockaddr_storage
579 *mapped_rem_sockaddr)
584 ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
587 return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
590 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
592 struct sk_buff *skb = NULL;
593 struct nlmsghdr *nlh;
595 const char *err_str = "";
598 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
600 err_str = "Unable to create a nlmsg";
601 goto mapinfo_num_error;
603 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
605 err_str = "Unable to put attribute of mapinfo number nlmsg";
606 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
608 goto mapinfo_num_error;
609 ret = ibnl_put_attr(skb, nlh, sizeof(u32),
610 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
612 goto mapinfo_num_error;
613 ret = ibnl_unicast(skb, nlh, iwpm_pid);
616 err_str = "Unable to send a nlmsg";
617 goto mapinfo_num_error;
619 pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
622 pr_info("%s: %s\n", __func__, err_str);
628 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
630 struct nlmsghdr *nlh = NULL;
635 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
636 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
637 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
641 nlh->nlmsg_type = NLMSG_DONE;
642 ret = ibnl_unicast(skb, (struct nlmsghdr *)skb->data, iwpm_pid);
644 pr_warn("%s Unable to send a nlmsg\n", __func__);
648 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
650 struct iwpm_mapping_info *map_info;
651 struct sk_buff *skb = NULL;
652 struct nlmsghdr *nlh;
653 int skb_num = 0, mapping_num = 0;
654 int i = 0, nlmsg_bytes = 0;
656 const char *err_str = "";
659 skb = dev_alloc_skb(NLMSG_GOODSIZE);
662 err_str = "Unable to allocate skb";
663 goto send_mapping_info_exit;
666 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
667 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
668 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
670 if (map_info->nl_client != nl_client)
673 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
674 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
676 err_str = "Unable to put the nlmsg header";
677 goto send_mapping_info_unlock;
679 err_str = "Unable to put attribute of the nlmsg";
680 ret = ibnl_put_attr(skb, nlh,
681 sizeof(struct sockaddr_storage),
682 &map_info->local_sockaddr,
683 IWPM_NLA_MAPINFO_LOCAL_ADDR);
685 goto send_mapping_info_unlock;
687 ret = ibnl_put_attr(skb, nlh,
688 sizeof(struct sockaddr_storage),
689 &map_info->mapped_sockaddr,
690 IWPM_NLA_MAPINFO_MAPPED_ADDR);
692 goto send_mapping_info_unlock;
694 iwpm_print_sockaddr(&map_info->local_sockaddr,
695 "send_mapping_info: Local sockaddr:");
696 iwpm_print_sockaddr(&map_info->mapped_sockaddr,
697 "send_mapping_info: Mapped local sockaddr:");
699 nlmsg_bytes += nlh->nlmsg_len;
701 /* check if all mappings can fit in one skb */
702 if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
703 /* and leave room for NLMSG_DONE */
706 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
709 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
712 err_str = "Unable to send map info";
713 goto send_mapping_info_exit;
715 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
717 err_str = "Insufficient skbs for map info";
718 goto send_mapping_info_exit;
720 skb = dev_alloc_skb(NLMSG_GOODSIZE);
723 err_str = "Unable to allocate skb";
724 goto send_mapping_info_exit;
726 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
730 send_mapping_info_unlock:
731 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
732 send_mapping_info_exit:
734 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
739 send_nlmsg_done(skb, nl_client, iwpm_pid);
740 return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
743 int iwpm_mapinfo_available(void)
746 int full_bucket = 0, i = 0;
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])) {
757 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);