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 */
iwpm_init(u8 nl_client)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 */
iwpm_exit(u8 nl_client)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 */
iwpm_create_mapinfo(struct sockaddr_storage * local_sockaddr,struct sockaddr_storage * mapped_sockaddr,u8 nl_client,u32 map_flags)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 */
iwpm_remove_mapinfo(struct sockaddr_storage * local_sockaddr,struct sockaddr_storage * mapped_local_addr)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
free_hash_bucket(void)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
free_reminfo_bucket(void)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
iwpm_add_remote_info(struct iwpm_remote_info * rem_info)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 */
iwpm_get_remote_info(struct sockaddr_storage * mapped_loc_addr,struct sockaddr_storage * mapped_rem_addr,struct sockaddr_storage * remote_addr,u8 nl_client)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
iwpm_get_nlmsg_request(__u32 nlmsg_seq,u8 nl_client,gfp_t gfp)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
iwpm_free_nlmsg_request(struct kref * kref)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
iwpm_find_nlmsg_request(__u32 echo_seq)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
iwpm_wait_complete_req(struct iwpm_nlmsg_request * nlmsg_request)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
iwpm_get_nlmsg_seq(void)385 int iwpm_get_nlmsg_seq(void)
386 {
387 return atomic_inc_return(&iwpm_admin.nlmsg_seq);
388 }
389
390 /* valid client */
iwpm_get_registration(u8 nl_client)391 u32 iwpm_get_registration(u8 nl_client)
392 {
393 return iwpm_admin.reg_list[nl_client];
394 }
395
396 /* valid client */
iwpm_set_registration(u8 nl_client,u32 reg)397 void iwpm_set_registration(u8 nl_client, u32 reg)
398 {
399 iwpm_admin.reg_list[nl_client] = reg;
400 }
401
402 /* valid client */
iwpm_check_registration(u8 nl_client,u32 reg)403 u32 iwpm_check_registration(u8 nl_client, u32 reg)
404 {
405 return (iwpm_get_registration(nl_client) & reg);
406 }
407
iwpm_compare_sockaddr(struct sockaddr_storage * a_sockaddr,struct sockaddr_storage * b_sockaddr)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
iwpm_create_nlmsg(u32 nl_op,struct nlmsghdr ** nlh,int nl_client)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
iwpm_parse_nlmsg(struct netlink_callback * cb,int policy_max,const struct nla_policy * nlmsg_policy,struct nlattr * nltb[],const char * msg_type)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
iwpm_print_sockaddr(struct sockaddr_storage * sockaddr,char * msg)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
iwpm_ipv6_jhash(struct sockaddr_in6 * ipv6_sockaddr)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
iwpm_ipv4_jhash(struct sockaddr_in * ipv4_sockaddr)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
get_hash_bucket(struct sockaddr_storage * a_sockaddr,struct sockaddr_storage * b_sockaddr,u32 * hash)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
get_mapinfo_hash_bucket(struct sockaddr_storage * local_sockaddr,struct sockaddr_storage * mapped_sockaddr)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
get_reminfo_hash_bucket(struct sockaddr_storage * mapped_loc_sockaddr,struct sockaddr_storage * mapped_rem_sockaddr)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
send_mapinfo_num(u32 mapping_num,u8 nl_client,int iwpm_pid)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
send_nlmsg_done(struct sk_buff * skb,u8 nl_client,int iwpm_pid)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
iwpm_send_mapinfo(u8 nl_client,int iwpm_pid)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
iwpm_mapinfo_available(void)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
iwpm_send_hello(u8 nl_client,int iwpm_pid,u16 abi_version)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