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30dc5e63 TN |
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_HASH_BUCKET_SIZE 512 | |
37 | #define IWPM_HASH_BUCKET_MASK (IWPM_HASH_BUCKET_SIZE - 1) | |
38 | ||
39 | static LIST_HEAD(iwpm_nlmsg_req_list); | |
40 | static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock); | |
41 | ||
42 | static struct hlist_head *iwpm_hash_bucket; | |
43 | static DEFINE_SPINLOCK(iwpm_mapinfo_lock); | |
44 | ||
45 | static DEFINE_MUTEX(iwpm_admin_lock); | |
46 | static struct iwpm_admin_data iwpm_admin; | |
47 | ||
48 | int iwpm_init(u8 nl_client) | |
49 | { | |
50 | if (iwpm_valid_client(nl_client)) | |
51 | return -EINVAL; | |
52 | mutex_lock(&iwpm_admin_lock); | |
53 | if (atomic_read(&iwpm_admin.refcount) == 0) { | |
54 | iwpm_hash_bucket = kzalloc(IWPM_HASH_BUCKET_SIZE * | |
55 | sizeof(struct hlist_head), GFP_KERNEL); | |
56 | if (!iwpm_hash_bucket) { | |
57 | mutex_unlock(&iwpm_admin_lock); | |
58 | pr_err("%s Unable to create mapinfo hash table\n", __func__); | |
59 | return -ENOMEM; | |
60 | } | |
61 | } | |
62 | atomic_inc(&iwpm_admin.refcount); | |
63 | mutex_unlock(&iwpm_admin_lock); | |
64 | iwpm_set_valid(nl_client, 1); | |
65 | return 0; | |
66 | } | |
67 | EXPORT_SYMBOL(iwpm_init); | |
68 | ||
69 | static void free_hash_bucket(void); | |
70 | ||
71 | int iwpm_exit(u8 nl_client) | |
72 | { | |
73 | ||
74 | if (!iwpm_valid_client(nl_client)) | |
75 | return -EINVAL; | |
76 | mutex_lock(&iwpm_admin_lock); | |
77 | if (atomic_read(&iwpm_admin.refcount) == 0) { | |
78 | mutex_unlock(&iwpm_admin_lock); | |
79 | pr_err("%s Incorrect usage - negative refcount\n", __func__); | |
80 | return -EINVAL; | |
81 | } | |
82 | if (atomic_dec_and_test(&iwpm_admin.refcount)) { | |
83 | free_hash_bucket(); | |
84 | pr_debug("%s: Mapinfo hash table is destroyed\n", __func__); | |
85 | } | |
86 | mutex_unlock(&iwpm_admin_lock); | |
87 | iwpm_set_valid(nl_client, 0); | |
88 | return 0; | |
89 | } | |
90 | EXPORT_SYMBOL(iwpm_exit); | |
91 | ||
92 | static struct hlist_head *get_hash_bucket_head(struct sockaddr_storage *, | |
93 | struct sockaddr_storage *); | |
94 | ||
95 | int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr, | |
96 | struct sockaddr_storage *mapped_sockaddr, | |
97 | u8 nl_client) | |
98 | { | |
99 | struct hlist_head *hash_bucket_head; | |
100 | struct iwpm_mapping_info *map_info; | |
101 | unsigned long flags; | |
102 | ||
103 | if (!iwpm_valid_client(nl_client)) | |
104 | return -EINVAL; | |
105 | map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL); | |
106 | if (!map_info) { | |
107 | pr_err("%s: Unable to allocate a mapping info\n", __func__); | |
108 | return -ENOMEM; | |
109 | } | |
110 | memcpy(&map_info->local_sockaddr, local_sockaddr, | |
111 | sizeof(struct sockaddr_storage)); | |
112 | memcpy(&map_info->mapped_sockaddr, mapped_sockaddr, | |
113 | sizeof(struct sockaddr_storage)); | |
114 | map_info->nl_client = nl_client; | |
115 | ||
116 | spin_lock_irqsave(&iwpm_mapinfo_lock, flags); | |
117 | if (iwpm_hash_bucket) { | |
118 | hash_bucket_head = get_hash_bucket_head( | |
119 | &map_info->local_sockaddr, | |
120 | &map_info->mapped_sockaddr); | |
121 | hlist_add_head(&map_info->hlist_node, hash_bucket_head); | |
122 | } | |
123 | spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); | |
124 | return 0; | |
125 | } | |
126 | EXPORT_SYMBOL(iwpm_create_mapinfo); | |
127 | ||
128 | int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr, | |
129 | struct sockaddr_storage *mapped_local_addr) | |
130 | { | |
131 | struct hlist_node *tmp_hlist_node; | |
132 | struct hlist_head *hash_bucket_head; | |
133 | struct iwpm_mapping_info *map_info = NULL; | |
134 | unsigned long flags; | |
135 | int ret = -EINVAL; | |
136 | ||
137 | spin_lock_irqsave(&iwpm_mapinfo_lock, flags); | |
138 | if (iwpm_hash_bucket) { | |
139 | hash_bucket_head = get_hash_bucket_head( | |
140 | local_sockaddr, | |
141 | mapped_local_addr); | |
142 | hlist_for_each_entry_safe(map_info, tmp_hlist_node, | |
143 | hash_bucket_head, hlist_node) { | |
144 | ||
145 | if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr, | |
146 | mapped_local_addr)) { | |
147 | ||
148 | hlist_del_init(&map_info->hlist_node); | |
149 | kfree(map_info); | |
150 | ret = 0; | |
151 | break; | |
152 | } | |
153 | } | |
154 | } | |
155 | spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); | |
156 | return ret; | |
157 | } | |
158 | EXPORT_SYMBOL(iwpm_remove_mapinfo); | |
159 | ||
160 | static void free_hash_bucket(void) | |
161 | { | |
162 | struct hlist_node *tmp_hlist_node; | |
163 | struct iwpm_mapping_info *map_info; | |
164 | unsigned long flags; | |
165 | int i; | |
166 | ||
167 | /* remove all the mapinfo data from the list */ | |
168 | spin_lock_irqsave(&iwpm_mapinfo_lock, flags); | |
169 | for (i = 0; i < IWPM_HASH_BUCKET_SIZE; i++) { | |
170 | hlist_for_each_entry_safe(map_info, tmp_hlist_node, | |
171 | &iwpm_hash_bucket[i], hlist_node) { | |
172 | ||
173 | hlist_del_init(&map_info->hlist_node); | |
174 | kfree(map_info); | |
175 | } | |
176 | } | |
177 | /* free the hash list */ | |
178 | kfree(iwpm_hash_bucket); | |
179 | iwpm_hash_bucket = NULL; | |
180 | spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); | |
181 | } | |
182 | ||
183 | struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq, | |
184 | u8 nl_client, gfp_t gfp) | |
185 | { | |
186 | struct iwpm_nlmsg_request *nlmsg_request = NULL; | |
187 | unsigned long flags; | |
188 | ||
189 | nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp); | |
190 | if (!nlmsg_request) { | |
191 | pr_err("%s Unable to allocate a nlmsg_request\n", __func__); | |
192 | return NULL; | |
193 | } | |
194 | spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags); | |
195 | list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list); | |
196 | spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags); | |
197 | ||
198 | kref_init(&nlmsg_request->kref); | |
199 | kref_get(&nlmsg_request->kref); | |
200 | nlmsg_request->nlmsg_seq = nlmsg_seq; | |
201 | nlmsg_request->nl_client = nl_client; | |
202 | nlmsg_request->request_done = 0; | |
203 | nlmsg_request->err_code = 0; | |
204 | return nlmsg_request; | |
205 | } | |
206 | ||
207 | void iwpm_free_nlmsg_request(struct kref *kref) | |
208 | { | |
209 | struct iwpm_nlmsg_request *nlmsg_request; | |
210 | unsigned long flags; | |
211 | ||
212 | nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref); | |
213 | ||
214 | spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags); | |
215 | list_del_init(&nlmsg_request->inprocess_list); | |
216 | spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags); | |
217 | ||
218 | if (!nlmsg_request->request_done) | |
219 | pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n", | |
220 | __func__, nlmsg_request->nlmsg_seq); | |
221 | kfree(nlmsg_request); | |
222 | } | |
223 | ||
224 | struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq) | |
225 | { | |
226 | struct iwpm_nlmsg_request *nlmsg_request; | |
227 | struct iwpm_nlmsg_request *found_request = NULL; | |
228 | unsigned long flags; | |
229 | ||
230 | spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags); | |
231 | list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list, | |
232 | inprocess_list) { | |
233 | if (nlmsg_request->nlmsg_seq == echo_seq) { | |
234 | found_request = nlmsg_request; | |
235 | kref_get(&nlmsg_request->kref); | |
236 | break; | |
237 | } | |
238 | } | |
239 | spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags); | |
240 | return found_request; | |
241 | } | |
242 | ||
243 | int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request) | |
244 | { | |
245 | int ret; | |
246 | init_waitqueue_head(&nlmsg_request->waitq); | |
247 | ||
248 | ret = wait_event_timeout(nlmsg_request->waitq, | |
249 | (nlmsg_request->request_done != 0), IWPM_NL_TIMEOUT); | |
250 | if (!ret) { | |
251 | ret = -EINVAL; | |
252 | pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n", | |
253 | __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq); | |
254 | } else { | |
255 | ret = nlmsg_request->err_code; | |
256 | } | |
257 | kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request); | |
258 | return ret; | |
259 | } | |
260 | ||
261 | int iwpm_get_nlmsg_seq(void) | |
262 | { | |
263 | return atomic_inc_return(&iwpm_admin.nlmsg_seq); | |
264 | } | |
265 | ||
266 | int iwpm_valid_client(u8 nl_client) | |
267 | { | |
268 | if (nl_client >= RDMA_NL_NUM_CLIENTS) | |
269 | return 0; | |
270 | return iwpm_admin.client_list[nl_client]; | |
271 | } | |
272 | ||
273 | void iwpm_set_valid(u8 nl_client, int valid) | |
274 | { | |
275 | if (nl_client >= RDMA_NL_NUM_CLIENTS) | |
276 | return; | |
277 | iwpm_admin.client_list[nl_client] = valid; | |
278 | } | |
279 | ||
280 | /* valid client */ | |
281 | int iwpm_registered_client(u8 nl_client) | |
282 | { | |
283 | return iwpm_admin.reg_list[nl_client]; | |
284 | } | |
285 | ||
286 | /* valid client */ | |
287 | void iwpm_set_registered(u8 nl_client, int reg) | |
288 | { | |
289 | iwpm_admin.reg_list[nl_client] = reg; | |
290 | } | |
291 | ||
292 | int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr, | |
293 | struct sockaddr_storage *b_sockaddr) | |
294 | { | |
295 | if (a_sockaddr->ss_family != b_sockaddr->ss_family) | |
296 | return 1; | |
297 | if (a_sockaddr->ss_family == AF_INET) { | |
298 | struct sockaddr_in *a4_sockaddr = | |
299 | (struct sockaddr_in *)a_sockaddr; | |
300 | struct sockaddr_in *b4_sockaddr = | |
301 | (struct sockaddr_in *)b_sockaddr; | |
302 | if (!memcmp(&a4_sockaddr->sin_addr, | |
303 | &b4_sockaddr->sin_addr, sizeof(struct in_addr)) | |
304 | && a4_sockaddr->sin_port == b4_sockaddr->sin_port) | |
305 | return 0; | |
306 | ||
307 | } else if (a_sockaddr->ss_family == AF_INET6) { | |
308 | struct sockaddr_in6 *a6_sockaddr = | |
309 | (struct sockaddr_in6 *)a_sockaddr; | |
310 | struct sockaddr_in6 *b6_sockaddr = | |
311 | (struct sockaddr_in6 *)b_sockaddr; | |
312 | if (!memcmp(&a6_sockaddr->sin6_addr, | |
313 | &b6_sockaddr->sin6_addr, sizeof(struct in6_addr)) | |
314 | && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port) | |
315 | return 0; | |
316 | ||
317 | } else { | |
318 | pr_err("%s: Invalid sockaddr family\n", __func__); | |
319 | } | |
320 | return 1; | |
321 | } | |
322 | ||
323 | struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh, | |
324 | int nl_client) | |
325 | { | |
326 | struct sk_buff *skb = NULL; | |
327 | ||
328 | skb = dev_alloc_skb(NLMSG_GOODSIZE); | |
329 | if (!skb) { | |
330 | pr_err("%s Unable to allocate skb\n", __func__); | |
331 | goto create_nlmsg_exit; | |
332 | } | |
333 | if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op, | |
334 | NLM_F_REQUEST))) { | |
335 | pr_warn("%s: Unable to put the nlmsg header\n", __func__); | |
336 | dev_kfree_skb(skb); | |
337 | skb = NULL; | |
338 | } | |
339 | create_nlmsg_exit: | |
340 | return skb; | |
341 | } | |
342 | ||
343 | int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max, | |
344 | const struct nla_policy *nlmsg_policy, | |
345 | struct nlattr *nltb[], const char *msg_type) | |
346 | { | |
347 | int nlh_len = 0; | |
348 | int ret; | |
349 | const char *err_str = ""; | |
350 | ||
351 | ret = nlmsg_validate(cb->nlh, nlh_len, policy_max-1, nlmsg_policy); | |
352 | if (ret) { | |
353 | err_str = "Invalid attribute"; | |
354 | goto parse_nlmsg_error; | |
355 | } | |
356 | ret = nlmsg_parse(cb->nlh, nlh_len, nltb, policy_max-1, nlmsg_policy); | |
357 | if (ret) { | |
358 | err_str = "Unable to parse the nlmsg"; | |
359 | goto parse_nlmsg_error; | |
360 | } | |
361 | ret = iwpm_validate_nlmsg_attr(nltb, policy_max); | |
362 | if (ret) { | |
363 | err_str = "Invalid NULL attribute"; | |
364 | goto parse_nlmsg_error; | |
365 | } | |
366 | return 0; | |
367 | parse_nlmsg_error: | |
368 | pr_warn("%s: %s (msg type %s ret = %d)\n", | |
369 | __func__, err_str, msg_type, ret); | |
370 | return ret; | |
371 | } | |
372 | ||
373 | void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg) | |
374 | { | |
375 | struct sockaddr_in6 *sockaddr_v6; | |
376 | struct sockaddr_in *sockaddr_v4; | |
377 | ||
378 | switch (sockaddr->ss_family) { | |
379 | case AF_INET: | |
380 | sockaddr_v4 = (struct sockaddr_in *)sockaddr; | |
381 | pr_debug("%s IPV4 %pI4: %u(0x%04X)\n", | |
382 | msg, &sockaddr_v4->sin_addr, | |
383 | ntohs(sockaddr_v4->sin_port), | |
384 | ntohs(sockaddr_v4->sin_port)); | |
385 | break; | |
386 | case AF_INET6: | |
387 | sockaddr_v6 = (struct sockaddr_in6 *)sockaddr; | |
388 | pr_debug("%s IPV6 %pI6: %u(0x%04X)\n", | |
389 | msg, &sockaddr_v6->sin6_addr, | |
390 | ntohs(sockaddr_v6->sin6_port), | |
391 | ntohs(sockaddr_v6->sin6_port)); | |
392 | break; | |
393 | default: | |
394 | break; | |
395 | } | |
396 | } | |
397 | ||
398 | static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr) | |
399 | { | |
400 | u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0); | |
401 | u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0); | |
402 | return hash; | |
403 | } | |
404 | ||
405 | static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr) | |
406 | { | |
407 | u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0); | |
408 | u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0); | |
409 | return hash; | |
410 | } | |
411 | ||
412 | static struct hlist_head *get_hash_bucket_head(struct sockaddr_storage | |
413 | *local_sockaddr, | |
414 | struct sockaddr_storage | |
415 | *mapped_sockaddr) | |
416 | { | |
417 | u32 local_hash, mapped_hash, hash; | |
418 | ||
419 | if (local_sockaddr->ss_family == AF_INET) { | |
420 | local_hash = iwpm_ipv4_jhash((struct sockaddr_in *) local_sockaddr); | |
421 | mapped_hash = iwpm_ipv4_jhash((struct sockaddr_in *) mapped_sockaddr); | |
422 | ||
423 | } else if (local_sockaddr->ss_family == AF_INET6) { | |
424 | local_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) local_sockaddr); | |
425 | mapped_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) mapped_sockaddr); | |
426 | } else { | |
427 | pr_err("%s: Invalid sockaddr family\n", __func__); | |
428 | return NULL; | |
429 | } | |
430 | ||
431 | if (local_hash == mapped_hash) /* if port mapper isn't available */ | |
432 | hash = local_hash; | |
433 | else | |
434 | hash = jhash_2words(local_hash, mapped_hash, 0); | |
435 | ||
436 | return &iwpm_hash_bucket[hash & IWPM_HASH_BUCKET_MASK]; | |
437 | } | |
438 | ||
439 | static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid) | |
440 | { | |
441 | struct sk_buff *skb = NULL; | |
442 | struct nlmsghdr *nlh; | |
443 | u32 msg_seq; | |
444 | const char *err_str = ""; | |
445 | int ret = -EINVAL; | |
446 | ||
447 | skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client); | |
448 | if (!skb) { | |
449 | err_str = "Unable to create a nlmsg"; | |
450 | goto mapinfo_num_error; | |
451 | } | |
452 | nlh->nlmsg_seq = iwpm_get_nlmsg_seq(); | |
453 | msg_seq = 0; | |
454 | err_str = "Unable to put attribute of mapinfo number nlmsg"; | |
455 | ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ); | |
456 | if (ret) | |
457 | goto mapinfo_num_error; | |
458 | ret = ibnl_put_attr(skb, nlh, sizeof(u32), | |
459 | &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM); | |
460 | if (ret) | |
461 | goto mapinfo_num_error; | |
462 | ret = ibnl_unicast(skb, nlh, iwpm_pid); | |
463 | if (ret) { | |
464 | skb = NULL; | |
465 | err_str = "Unable to send a nlmsg"; | |
466 | goto mapinfo_num_error; | |
467 | } | |
468 | pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num); | |
469 | return 0; | |
470 | mapinfo_num_error: | |
471 | pr_info("%s: %s\n", __func__, err_str); | |
472 | if (skb) | |
473 | dev_kfree_skb(skb); | |
474 | return ret; | |
475 | } | |
476 | ||
477 | static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid) | |
478 | { | |
479 | struct nlmsghdr *nlh = NULL; | |
480 | int ret = 0; | |
481 | ||
482 | if (!skb) | |
483 | return ret; | |
484 | if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client, | |
485 | RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) { | |
486 | pr_warn("%s Unable to put NLMSG_DONE\n", __func__); | |
487 | return -ENOMEM; | |
488 | } | |
489 | nlh->nlmsg_type = NLMSG_DONE; | |
490 | ret = ibnl_unicast(skb, (struct nlmsghdr *)skb->data, iwpm_pid); | |
491 | if (ret) | |
492 | pr_warn("%s Unable to send a nlmsg\n", __func__); | |
493 | return ret; | |
494 | } | |
495 | ||
496 | int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid) | |
497 | { | |
498 | struct iwpm_mapping_info *map_info; | |
499 | struct sk_buff *skb = NULL; | |
500 | struct nlmsghdr *nlh; | |
501 | int skb_num = 0, mapping_num = 0; | |
502 | int i = 0, nlmsg_bytes = 0; | |
503 | unsigned long flags; | |
504 | const char *err_str = ""; | |
505 | int ret; | |
506 | ||
507 | skb = dev_alloc_skb(NLMSG_GOODSIZE); | |
508 | if (!skb) { | |
509 | ret = -ENOMEM; | |
510 | err_str = "Unable to allocate skb"; | |
511 | goto send_mapping_info_exit; | |
512 | } | |
513 | skb_num++; | |
514 | spin_lock_irqsave(&iwpm_mapinfo_lock, flags); | |
515 | for (i = 0; i < IWPM_HASH_BUCKET_SIZE; i++) { | |
516 | hlist_for_each_entry(map_info, &iwpm_hash_bucket[i], | |
517 | hlist_node) { | |
518 | if (map_info->nl_client != nl_client) | |
519 | continue; | |
520 | nlh = NULL; | |
521 | if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client, | |
522 | RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) { | |
523 | ret = -ENOMEM; | |
524 | err_str = "Unable to put the nlmsg header"; | |
525 | goto send_mapping_info_unlock; | |
526 | } | |
527 | err_str = "Unable to put attribute of the nlmsg"; | |
528 | ret = ibnl_put_attr(skb, nlh, | |
529 | sizeof(struct sockaddr_storage), | |
530 | &map_info->local_sockaddr, | |
531 | IWPM_NLA_MAPINFO_LOCAL_ADDR); | |
532 | if (ret) | |
533 | goto send_mapping_info_unlock; | |
534 | ||
535 | ret = ibnl_put_attr(skb, nlh, | |
536 | sizeof(struct sockaddr_storage), | |
537 | &map_info->mapped_sockaddr, | |
538 | IWPM_NLA_MAPINFO_MAPPED_ADDR); | |
539 | if (ret) | |
540 | goto send_mapping_info_unlock; | |
541 | ||
542 | iwpm_print_sockaddr(&map_info->local_sockaddr, | |
543 | "send_mapping_info: Local sockaddr:"); | |
544 | iwpm_print_sockaddr(&map_info->mapped_sockaddr, | |
545 | "send_mapping_info: Mapped local sockaddr:"); | |
546 | mapping_num++; | |
547 | nlmsg_bytes += nlh->nlmsg_len; | |
548 | ||
549 | /* check if all mappings can fit in one skb */ | |
550 | if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) { | |
551 | /* and leave room for NLMSG_DONE */ | |
552 | nlmsg_bytes = 0; | |
553 | skb_num++; | |
554 | spin_unlock_irqrestore(&iwpm_mapinfo_lock, | |
555 | flags); | |
556 | /* send the skb */ | |
557 | ret = send_nlmsg_done(skb, nl_client, iwpm_pid); | |
558 | skb = NULL; | |
559 | if (ret) { | |
560 | err_str = "Unable to send map info"; | |
561 | goto send_mapping_info_exit; | |
562 | } | |
563 | if (skb_num == IWPM_MAPINFO_SKB_COUNT) { | |
564 | ret = -ENOMEM; | |
565 | err_str = "Insufficient skbs for map info"; | |
566 | goto send_mapping_info_exit; | |
567 | } | |
568 | skb = dev_alloc_skb(NLMSG_GOODSIZE); | |
569 | if (!skb) { | |
570 | ret = -ENOMEM; | |
571 | err_str = "Unable to allocate skb"; | |
572 | goto send_mapping_info_exit; | |
573 | } | |
574 | spin_lock_irqsave(&iwpm_mapinfo_lock, flags); | |
575 | } | |
576 | } | |
577 | } | |
578 | send_mapping_info_unlock: | |
579 | spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); | |
580 | send_mapping_info_exit: | |
581 | if (ret) { | |
582 | pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret); | |
583 | if (skb) | |
584 | dev_kfree_skb(skb); | |
585 | return ret; | |
586 | } | |
587 | send_nlmsg_done(skb, nl_client, iwpm_pid); | |
588 | return send_mapinfo_num(mapping_num, nl_client, iwpm_pid); | |
589 | } | |
590 | ||
591 | int iwpm_mapinfo_available(void) | |
592 | { | |
593 | unsigned long flags; | |
594 | int full_bucket = 0, i = 0; | |
595 | ||
596 | spin_lock_irqsave(&iwpm_mapinfo_lock, flags); | |
597 | if (iwpm_hash_bucket) { | |
598 | for (i = 0; i < IWPM_HASH_BUCKET_SIZE; i++) { | |
599 | if (!hlist_empty(&iwpm_hash_bucket[i])) { | |
600 | full_bucket = 1; | |
601 | break; | |
602 | } | |
603 | } | |
604 | } | |
605 | spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags); | |
606 | return full_bucket; | |
607 | } |