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 DEFINE_MUTEX(iwpm_admin_lock);
52 static struct iwpm_admin_data iwpm_admin;
53
54 /**
55 * iwpm_init - Allocate resources for the iwarp port mapper
56 * @nl_client: The index of the netlink client
57 *
58 * Should be called when network interface goes up.
59 */
iwpm_init(u8 nl_client)60 int iwpm_init(u8 nl_client)
61 {
62 int ret = 0;
63 mutex_lock(&iwpm_admin_lock);
64 if (atomic_read(&iwpm_admin.refcount) == 0) {
65 iwpm_hash_bucket = kcalloc(IWPM_MAPINFO_HASH_SIZE,
66 sizeof(struct hlist_head),
67 GFP_KERNEL);
68 if (!iwpm_hash_bucket) {
69 ret = -ENOMEM;
70 goto init_exit;
71 }
72 iwpm_reminfo_bucket = kcalloc(IWPM_REMINFO_HASH_SIZE,
73 sizeof(struct hlist_head),
74 GFP_KERNEL);
75 if (!iwpm_reminfo_bucket) {
76 kfree(iwpm_hash_bucket);
77 ret = -ENOMEM;
78 goto init_exit;
79 }
80 }
81 atomic_inc(&iwpm_admin.refcount);
82 init_exit:
83 mutex_unlock(&iwpm_admin_lock);
84 if (!ret) {
85 iwpm_set_valid(nl_client, 1);
86 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
87 pr_debug("%s: Mapinfo and reminfo tables are created\n",
88 __func__);
89 }
90 return ret;
91 }
92
93 static void free_hash_bucket(void);
94 static void free_reminfo_bucket(void);
95
96 /**
97 * iwpm_exit - Deallocate resources for the iwarp port mapper
98 * @nl_client: The index of the netlink client
99 *
100 * Should be called when network interface goes down.
101 */
iwpm_exit(u8 nl_client)102 int iwpm_exit(u8 nl_client)
103 {
104
105 if (!iwpm_valid_client(nl_client))
106 return -EINVAL;
107 mutex_lock(&iwpm_admin_lock);
108 if (atomic_read(&iwpm_admin.refcount) == 0) {
109 mutex_unlock(&iwpm_admin_lock);
110 pr_err("%s Incorrect usage - negative refcount\n", __func__);
111 return -EINVAL;
112 }
113 if (atomic_dec_and_test(&iwpm_admin.refcount)) {
114 free_hash_bucket();
115 free_reminfo_bucket();
116 pr_debug("%s: Resources are destroyed\n", __func__);
117 }
118 mutex_unlock(&iwpm_admin_lock);
119 iwpm_set_valid(nl_client, 0);
120 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
121 return 0;
122 }
123
124 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
125 struct sockaddr_storage *);
126
127 /**
128 * iwpm_create_mapinfo - Store local and mapped IPv4/IPv6 address
129 * info in a hash table
130 * @local_addr: Local ip/tcp address
131 * @mapped_addr: Mapped local ip/tcp address
132 * @nl_client: The index of the netlink client
133 * @map_flags: IWPM mapping flags
134 */
iwpm_create_mapinfo(struct sockaddr_storage * local_sockaddr,struct sockaddr_storage * mapped_sockaddr,u8 nl_client,u32 map_flags)135 int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
136 struct sockaddr_storage *mapped_sockaddr,
137 u8 nl_client, u32 map_flags)
138 {
139 struct hlist_head *hash_bucket_head = NULL;
140 struct iwpm_mapping_info *map_info;
141 unsigned long flags;
142 int ret = -EINVAL;
143
144 if (!iwpm_valid_client(nl_client))
145 return ret;
146 map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
147 if (!map_info)
148 return -ENOMEM;
149
150 memcpy(&map_info->local_sockaddr, local_sockaddr,
151 sizeof(struct sockaddr_storage));
152 memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
153 sizeof(struct sockaddr_storage));
154 map_info->nl_client = nl_client;
155 map_info->map_flags = map_flags;
156
157 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
158 if (iwpm_hash_bucket) {
159 hash_bucket_head = get_mapinfo_hash_bucket(
160 &map_info->local_sockaddr,
161 &map_info->mapped_sockaddr);
162 if (hash_bucket_head) {
163 hlist_add_head(&map_info->hlist_node, hash_bucket_head);
164 ret = 0;
165 }
166 }
167 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
168
169 if (!hash_bucket_head)
170 kfree(map_info);
171 return ret;
172 }
173
174 /**
175 * iwpm_remove_mapinfo - Remove local and mapped IPv4/IPv6 address
176 * info from the hash table
177 * @local_addr: Local ip/tcp address
178 * @mapped_local_addr: Mapped local ip/tcp address
179 *
180 * Returns err code if mapping info is not found in the hash table,
181 * otherwise returns 0
182 */
iwpm_remove_mapinfo(struct sockaddr_storage * local_sockaddr,struct sockaddr_storage * mapped_local_addr)183 int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
184 struct sockaddr_storage *mapped_local_addr)
185 {
186 struct hlist_node *tmp_hlist_node;
187 struct hlist_head *hash_bucket_head;
188 struct iwpm_mapping_info *map_info = NULL;
189 unsigned long flags;
190 int ret = -EINVAL;
191
192 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
193 if (iwpm_hash_bucket) {
194 hash_bucket_head = get_mapinfo_hash_bucket(
195 local_sockaddr,
196 mapped_local_addr);
197 if (!hash_bucket_head)
198 goto remove_mapinfo_exit;
199
200 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
201 hash_bucket_head, hlist_node) {
202
203 if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
204 mapped_local_addr)) {
205
206 hlist_del_init(&map_info->hlist_node);
207 kfree(map_info);
208 ret = 0;
209 break;
210 }
211 }
212 }
213 remove_mapinfo_exit:
214 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
215 return ret;
216 }
217
free_hash_bucket(void)218 static void free_hash_bucket(void)
219 {
220 struct hlist_node *tmp_hlist_node;
221 struct iwpm_mapping_info *map_info;
222 unsigned long flags;
223 int i;
224
225 /* remove all the mapinfo data from the list */
226 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
227 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
228 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
229 &iwpm_hash_bucket[i], hlist_node) {
230
231 hlist_del_init(&map_info->hlist_node);
232 kfree(map_info);
233 }
234 }
235 /* free the hash list */
236 kfree(iwpm_hash_bucket);
237 iwpm_hash_bucket = NULL;
238 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
239 }
240
free_reminfo_bucket(void)241 static void free_reminfo_bucket(void)
242 {
243 struct hlist_node *tmp_hlist_node;
244 struct iwpm_remote_info *rem_info;
245 unsigned long flags;
246 int i;
247
248 /* remove all the remote info from the list */
249 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
250 for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
251 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
252 &iwpm_reminfo_bucket[i], hlist_node) {
253
254 hlist_del_init(&rem_info->hlist_node);
255 kfree(rem_info);
256 }
257 }
258 /* free the hash list */
259 kfree(iwpm_reminfo_bucket);
260 iwpm_reminfo_bucket = NULL;
261 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
262 }
263
264 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
265 struct sockaddr_storage *);
266
iwpm_add_remote_info(struct iwpm_remote_info * rem_info)267 void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
268 {
269 struct hlist_head *hash_bucket_head;
270 unsigned long flags;
271
272 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
273 if (iwpm_reminfo_bucket) {
274 hash_bucket_head = get_reminfo_hash_bucket(
275 &rem_info->mapped_loc_sockaddr,
276 &rem_info->mapped_rem_sockaddr);
277 if (hash_bucket_head)
278 hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
279 }
280 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
281 }
282
283 /**
284 * iwpm_get_remote_info - Get the remote connecting peer address info
285 *
286 * @mapped_loc_addr: Mapped local address of the listening peer
287 * @mapped_rem_addr: Mapped remote address of the connecting peer
288 * @remote_addr: To store the remote address of the connecting peer
289 * @nl_client: The index of the netlink client
290 *
291 * The remote address info is retrieved and provided to the client in
292 * the remote_addr. After that it is removed from the hash table
293 */
iwpm_get_remote_info(struct sockaddr_storage * mapped_loc_addr,struct sockaddr_storage * mapped_rem_addr,struct sockaddr_storage * remote_addr,u8 nl_client)294 int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
295 struct sockaddr_storage *mapped_rem_addr,
296 struct sockaddr_storage *remote_addr,
297 u8 nl_client)
298 {
299 struct hlist_node *tmp_hlist_node;
300 struct hlist_head *hash_bucket_head;
301 struct iwpm_remote_info *rem_info = NULL;
302 unsigned long flags;
303 int ret = -EINVAL;
304
305 if (!iwpm_valid_client(nl_client)) {
306 pr_info("%s: Invalid client = %d\n", __func__, nl_client);
307 return ret;
308 }
309 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
310 if (iwpm_reminfo_bucket) {
311 hash_bucket_head = get_reminfo_hash_bucket(
312 mapped_loc_addr,
313 mapped_rem_addr);
314 if (!hash_bucket_head)
315 goto get_remote_info_exit;
316 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
317 hash_bucket_head, hlist_node) {
318
319 if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
320 mapped_loc_addr) &&
321 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
322 mapped_rem_addr)) {
323
324 memcpy(remote_addr, &rem_info->remote_sockaddr,
325 sizeof(struct sockaddr_storage));
326 iwpm_print_sockaddr(remote_addr,
327 "get_remote_info: Remote sockaddr:");
328
329 hlist_del_init(&rem_info->hlist_node);
330 kfree(rem_info);
331 ret = 0;
332 break;
333 }
334 }
335 }
336 get_remote_info_exit:
337 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
338 return ret;
339 }
340
iwpm_get_nlmsg_request(__u32 nlmsg_seq,u8 nl_client,gfp_t gfp)341 struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
342 u8 nl_client, gfp_t gfp)
343 {
344 struct iwpm_nlmsg_request *nlmsg_request = NULL;
345 unsigned long flags;
346
347 nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
348 if (!nlmsg_request)
349 return NULL;
350
351 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
352 list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
353 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
354
355 kref_init(&nlmsg_request->kref);
356 kref_get(&nlmsg_request->kref);
357 nlmsg_request->nlmsg_seq = nlmsg_seq;
358 nlmsg_request->nl_client = nl_client;
359 nlmsg_request->request_done = 0;
360 nlmsg_request->err_code = 0;
361 sema_init(&nlmsg_request->sem, 1);
362 down(&nlmsg_request->sem);
363 return nlmsg_request;
364 }
365
iwpm_free_nlmsg_request(struct kref * kref)366 void iwpm_free_nlmsg_request(struct kref *kref)
367 {
368 struct iwpm_nlmsg_request *nlmsg_request;
369 unsigned long flags;
370
371 nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
372
373 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
374 list_del_init(&nlmsg_request->inprocess_list);
375 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
376
377 if (!nlmsg_request->request_done)
378 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
379 __func__, nlmsg_request->nlmsg_seq);
380 kfree(nlmsg_request);
381 }
382
iwpm_find_nlmsg_request(__u32 echo_seq)383 struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
384 {
385 struct iwpm_nlmsg_request *nlmsg_request;
386 struct iwpm_nlmsg_request *found_request = NULL;
387 unsigned long flags;
388
389 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
390 list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
391 inprocess_list) {
392 if (nlmsg_request->nlmsg_seq == echo_seq) {
393 found_request = nlmsg_request;
394 kref_get(&nlmsg_request->kref);
395 break;
396 }
397 }
398 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
399 return found_request;
400 }
401
iwpm_wait_complete_req(struct iwpm_nlmsg_request * nlmsg_request)402 int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
403 {
404 int ret;
405
406 ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
407 if (ret) {
408 ret = -EINVAL;
409 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
410 __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
411 } else {
412 ret = nlmsg_request->err_code;
413 }
414 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
415 return ret;
416 }
417
iwpm_get_nlmsg_seq(void)418 int iwpm_get_nlmsg_seq(void)
419 {
420 return atomic_inc_return(&iwpm_admin.nlmsg_seq);
421 }
422
iwpm_valid_client(u8 nl_client)423 int iwpm_valid_client(u8 nl_client)
424 {
425 return iwpm_admin.client_list[nl_client];
426 }
427
iwpm_set_valid(u8 nl_client,int valid)428 void iwpm_set_valid(u8 nl_client, int valid)
429 {
430 iwpm_admin.client_list[nl_client] = valid;
431 }
432
433 /* valid client */
iwpm_get_registration(u8 nl_client)434 u32 iwpm_get_registration(u8 nl_client)
435 {
436 return iwpm_admin.reg_list[nl_client];
437 }
438
439 /* valid client */
iwpm_set_registration(u8 nl_client,u32 reg)440 void iwpm_set_registration(u8 nl_client, u32 reg)
441 {
442 iwpm_admin.reg_list[nl_client] = reg;
443 }
444
445 /* valid client */
iwpm_check_registration(u8 nl_client,u32 reg)446 u32 iwpm_check_registration(u8 nl_client, u32 reg)
447 {
448 return (iwpm_get_registration(nl_client) & reg);
449 }
450
iwpm_compare_sockaddr(struct sockaddr_storage * a_sockaddr,struct sockaddr_storage * b_sockaddr)451 int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
452 struct sockaddr_storage *b_sockaddr)
453 {
454 if (a_sockaddr->ss_family != b_sockaddr->ss_family)
455 return 1;
456 if (a_sockaddr->ss_family == AF_INET) {
457 struct sockaddr_in *a4_sockaddr =
458 (struct sockaddr_in *)a_sockaddr;
459 struct sockaddr_in *b4_sockaddr =
460 (struct sockaddr_in *)b_sockaddr;
461 if (!memcmp(&a4_sockaddr->sin_addr,
462 &b4_sockaddr->sin_addr, sizeof(struct in_addr))
463 && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
464 return 0;
465
466 } else if (a_sockaddr->ss_family == AF_INET6) {
467 struct sockaddr_in6 *a6_sockaddr =
468 (struct sockaddr_in6 *)a_sockaddr;
469 struct sockaddr_in6 *b6_sockaddr =
470 (struct sockaddr_in6 *)b_sockaddr;
471 if (!memcmp(&a6_sockaddr->sin6_addr,
472 &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
473 && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
474 return 0;
475
476 } else {
477 pr_err("%s: Invalid sockaddr family\n", __func__);
478 }
479 return 1;
480 }
481
iwpm_create_nlmsg(u32 nl_op,struct nlmsghdr ** nlh,int nl_client)482 struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
483 int nl_client)
484 {
485 struct sk_buff *skb = NULL;
486
487 skb = dev_alloc_skb(IWPM_MSG_SIZE);
488 if (!skb)
489 goto create_nlmsg_exit;
490
491 if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
492 NLM_F_REQUEST))) {
493 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
494 dev_kfree_skb(skb);
495 skb = NULL;
496 }
497 create_nlmsg_exit:
498 return skb;
499 }
500
iwpm_parse_nlmsg(struct netlink_callback * cb,int policy_max,const struct nla_policy * nlmsg_policy,struct nlattr * nltb[],const char * msg_type)501 int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
502 const struct nla_policy *nlmsg_policy,
503 struct nlattr *nltb[], const char *msg_type)
504 {
505 int nlh_len = 0;
506 int ret;
507 const char *err_str = "";
508
509 ret = nlmsg_validate_deprecated(cb->nlh, nlh_len, policy_max - 1,
510 nlmsg_policy, NULL);
511 if (ret) {
512 err_str = "Invalid attribute";
513 goto parse_nlmsg_error;
514 }
515 ret = nlmsg_parse_deprecated(cb->nlh, nlh_len, nltb, policy_max - 1,
516 nlmsg_policy, NULL);
517 if (ret) {
518 err_str = "Unable to parse the nlmsg";
519 goto parse_nlmsg_error;
520 }
521 ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
522 if (ret) {
523 err_str = "Invalid NULL attribute";
524 goto parse_nlmsg_error;
525 }
526 return 0;
527 parse_nlmsg_error:
528 pr_warn("%s: %s (msg type %s ret = %d)\n",
529 __func__, err_str, msg_type, ret);
530 return ret;
531 }
532
iwpm_print_sockaddr(struct sockaddr_storage * sockaddr,char * msg)533 void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
534 {
535 struct sockaddr_in6 *sockaddr_v6;
536 struct sockaddr_in *sockaddr_v4;
537
538 switch (sockaddr->ss_family) {
539 case AF_INET:
540 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
541 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
542 msg, &sockaddr_v4->sin_addr,
543 ntohs(sockaddr_v4->sin_port),
544 ntohs(sockaddr_v4->sin_port));
545 break;
546 case AF_INET6:
547 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
548 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
549 msg, &sockaddr_v6->sin6_addr,
550 ntohs(sockaddr_v6->sin6_port),
551 ntohs(sockaddr_v6->sin6_port));
552 break;
553 default:
554 break;
555 }
556 }
557
iwpm_ipv6_jhash(struct sockaddr_in6 * ipv6_sockaddr)558 static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
559 {
560 u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
561 u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
562 return hash;
563 }
564
iwpm_ipv4_jhash(struct sockaddr_in * ipv4_sockaddr)565 static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
566 {
567 u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
568 u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
569 return hash;
570 }
571
get_hash_bucket(struct sockaddr_storage * a_sockaddr,struct sockaddr_storage * b_sockaddr,u32 * hash)572 static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
573 struct sockaddr_storage *b_sockaddr, u32 *hash)
574 {
575 u32 a_hash, b_hash;
576
577 if (a_sockaddr->ss_family == AF_INET) {
578 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
579 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
580
581 } else if (a_sockaddr->ss_family == AF_INET6) {
582 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
583 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
584 } else {
585 pr_err("%s: Invalid sockaddr family\n", __func__);
586 return -EINVAL;
587 }
588
589 if (a_hash == b_hash) /* if port mapper isn't available */
590 *hash = a_hash;
591 else
592 *hash = jhash_2words(a_hash, b_hash, 0);
593 return 0;
594 }
595
get_mapinfo_hash_bucket(struct sockaddr_storage * local_sockaddr,struct sockaddr_storage * mapped_sockaddr)596 static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
597 *local_sockaddr, struct sockaddr_storage
598 *mapped_sockaddr)
599 {
600 u32 hash;
601 int ret;
602
603 ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
604 if (ret)
605 return NULL;
606 return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
607 }
608
get_reminfo_hash_bucket(struct sockaddr_storage * mapped_loc_sockaddr,struct sockaddr_storage * mapped_rem_sockaddr)609 static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
610 *mapped_loc_sockaddr, struct sockaddr_storage
611 *mapped_rem_sockaddr)
612 {
613 u32 hash;
614 int ret;
615
616 ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
617 if (ret)
618 return NULL;
619 return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
620 }
621
send_mapinfo_num(u32 mapping_num,u8 nl_client,int iwpm_pid)622 static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
623 {
624 struct sk_buff *skb = NULL;
625 struct nlmsghdr *nlh;
626 u32 msg_seq;
627 const char *err_str = "";
628 int ret = -EINVAL;
629
630 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
631 if (!skb) {
632 err_str = "Unable to create a nlmsg";
633 goto mapinfo_num_error;
634 }
635 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
636 msg_seq = 0;
637 err_str = "Unable to put attribute of mapinfo number nlmsg";
638 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
639 if (ret)
640 goto mapinfo_num_error;
641 ret = ibnl_put_attr(skb, nlh, sizeof(u32),
642 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
643 if (ret)
644 goto mapinfo_num_error;
645
646 nlmsg_end(skb, nlh);
647
648 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
649 if (ret) {
650 skb = NULL;
651 err_str = "Unable to send a nlmsg";
652 goto mapinfo_num_error;
653 }
654 pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
655 return 0;
656 mapinfo_num_error:
657 pr_info("%s: %s\n", __func__, err_str);
658 dev_kfree_skb(skb);
659 return ret;
660 }
661
send_nlmsg_done(struct sk_buff * skb,u8 nl_client,int iwpm_pid)662 static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
663 {
664 struct nlmsghdr *nlh = NULL;
665 int ret = 0;
666
667 if (!skb)
668 return ret;
669 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
670 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
671 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
672 dev_kfree_skb(skb);
673 return -ENOMEM;
674 }
675 nlh->nlmsg_type = NLMSG_DONE;
676 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
677 if (ret)
678 pr_warn("%s Unable to send a nlmsg\n", __func__);
679 return ret;
680 }
681
iwpm_send_mapinfo(u8 nl_client,int iwpm_pid)682 int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
683 {
684 struct iwpm_mapping_info *map_info;
685 struct sk_buff *skb = NULL;
686 struct nlmsghdr *nlh;
687 int skb_num = 0, mapping_num = 0;
688 int i = 0, nlmsg_bytes = 0;
689 unsigned long flags;
690 const char *err_str = "";
691 int ret;
692
693 skb = dev_alloc_skb(NLMSG_GOODSIZE);
694 if (!skb) {
695 ret = -ENOMEM;
696 err_str = "Unable to allocate skb";
697 goto send_mapping_info_exit;
698 }
699 skb_num++;
700 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
701 ret = -EINVAL;
702 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
703 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
704 hlist_node) {
705 if (map_info->nl_client != nl_client)
706 continue;
707 nlh = NULL;
708 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
709 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
710 ret = -ENOMEM;
711 err_str = "Unable to put the nlmsg header";
712 goto send_mapping_info_unlock;
713 }
714 err_str = "Unable to put attribute of the nlmsg";
715 ret = ibnl_put_attr(skb, nlh,
716 sizeof(struct sockaddr_storage),
717 &map_info->local_sockaddr,
718 IWPM_NLA_MAPINFO_LOCAL_ADDR);
719 if (ret)
720 goto send_mapping_info_unlock;
721
722 ret = ibnl_put_attr(skb, nlh,
723 sizeof(struct sockaddr_storage),
724 &map_info->mapped_sockaddr,
725 IWPM_NLA_MAPINFO_MAPPED_ADDR);
726 if (ret)
727 goto send_mapping_info_unlock;
728
729 if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) {
730 ret = ibnl_put_attr(skb, nlh, sizeof(u32),
731 &map_info->map_flags,
732 IWPM_NLA_MAPINFO_FLAGS);
733 if (ret)
734 goto send_mapping_info_unlock;
735 }
736
737 nlmsg_end(skb, nlh);
738
739 iwpm_print_sockaddr(&map_info->local_sockaddr,
740 "send_mapping_info: Local sockaddr:");
741 iwpm_print_sockaddr(&map_info->mapped_sockaddr,
742 "send_mapping_info: Mapped local sockaddr:");
743 mapping_num++;
744 nlmsg_bytes += nlh->nlmsg_len;
745
746 /* check if all mappings can fit in one skb */
747 if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
748 /* and leave room for NLMSG_DONE */
749 nlmsg_bytes = 0;
750 skb_num++;
751 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
752 flags);
753 /* send the skb */
754 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
755 skb = NULL;
756 if (ret) {
757 err_str = "Unable to send map info";
758 goto send_mapping_info_exit;
759 }
760 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
761 ret = -ENOMEM;
762 err_str = "Insufficient skbs for map info";
763 goto send_mapping_info_exit;
764 }
765 skb = dev_alloc_skb(NLMSG_GOODSIZE);
766 if (!skb) {
767 ret = -ENOMEM;
768 err_str = "Unable to allocate skb";
769 goto send_mapping_info_exit;
770 }
771 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
772 }
773 }
774 }
775 send_mapping_info_unlock:
776 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
777 send_mapping_info_exit:
778 if (ret) {
779 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
780 dev_kfree_skb(skb);
781 return ret;
782 }
783 send_nlmsg_done(skb, nl_client, iwpm_pid);
784 return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
785 }
786
iwpm_mapinfo_available(void)787 int iwpm_mapinfo_available(void)
788 {
789 unsigned long flags;
790 int full_bucket = 0, i = 0;
791
792 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
793 if (iwpm_hash_bucket) {
794 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
795 if (!hlist_empty(&iwpm_hash_bucket[i])) {
796 full_bucket = 1;
797 break;
798 }
799 }
800 }
801 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
802 return full_bucket;
803 }
804
iwpm_send_hello(u8 nl_client,int iwpm_pid,u16 abi_version)805 int iwpm_send_hello(u8 nl_client, int iwpm_pid, u16 abi_version)
806 {
807 struct sk_buff *skb = NULL;
808 struct nlmsghdr *nlh;
809 const char *err_str = "";
810 int ret = -EINVAL;
811
812 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_HELLO, &nlh, nl_client);
813 if (!skb) {
814 err_str = "Unable to create a nlmsg";
815 goto hello_num_error;
816 }
817 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
818 err_str = "Unable to put attribute of abi_version into nlmsg";
819 ret = ibnl_put_attr(skb, nlh, sizeof(u16), &abi_version,
820 IWPM_NLA_HELLO_ABI_VERSION);
821 if (ret)
822 goto hello_num_error;
823 nlmsg_end(skb, nlh);
824
825 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
826 if (ret) {
827 skb = NULL;
828 err_str = "Unable to send a nlmsg";
829 goto hello_num_error;
830 }
831 pr_debug("%s: Sent hello abi_version = %u\n", __func__, abi_version);
832 return 0;
833 hello_num_error:
834 pr_info("%s: %s\n", __func__, err_str);
835 dev_kfree_skb(skb);
836 return ret;
837 }
838
