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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
42static LIST_HEAD(iwpm_nlmsg_req_list);
43static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
44
45static struct hlist_head *iwpm_hash_bucket;
46static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
47
48static struct hlist_head *iwpm_reminfo_bucket;
49static DEFINE_SPINLOCK(iwpm_reminfo_lock);
50
51static struct iwpm_admin_data iwpm_admin;
52
53/**
54 * iwpm_init - Allocate resources for the iwarp port mapper
55 * @nl_client: The index of the netlink client
56 *
57 * Should be called when network interface goes up.
58 */
59int iwpm_init(u8 nl_client)
60{
61 iwpm_hash_bucket = kcalloc(IWPM_MAPINFO_HASH_SIZE,
62 sizeof(struct hlist_head), GFP_KERNEL);
63 if (!iwpm_hash_bucket)
64 return -ENOMEM;
65
66 iwpm_reminfo_bucket = kcalloc(IWPM_REMINFO_HASH_SIZE,
67 sizeof(struct hlist_head), GFP_KERNEL);
68 if (!iwpm_reminfo_bucket) {
69 kfree(iwpm_hash_bucket);
70 return -ENOMEM;
71 }
72
73 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
74 pr_debug("%s: Mapinfo and reminfo tables are created\n", __func__);
75 return 0;
76}
77
78static void free_hash_bucket(void);
79static void free_reminfo_bucket(void);
80
81/**
82 * iwpm_exit - Deallocate resources for the iwarp port mapper
83 * @nl_client: The index of the netlink client
84 *
85 * Should be called when network interface goes down.
86 */
87int iwpm_exit(u8 nl_client)
88{
89 free_hash_bucket();
90 free_reminfo_bucket();
91 pr_debug("%s: Resources are destroyed\n", __func__);
92 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
93 return 0;
94}
95
96static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
97 struct sockaddr_storage *);
98
99/**
100 * iwpm_create_mapinfo - Store local and mapped IPv4/IPv6 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 */
107int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
108 struct sockaddr_storage *mapped_sockaddr,
109 u8 nl_client, u32 map_flags)
110{
111 struct hlist_head *hash_bucket_head = NULL;
112 struct iwpm_mapping_info *map_info;
113 unsigned long flags;
114 int ret = -EINVAL;
115
116 map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
117 if (!map_info)
118 return -ENOMEM;
119
120 memcpy(&map_info->local_sockaddr, local_sockaddr,
121 sizeof(struct sockaddr_storage));
122 memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
123 sizeof(struct sockaddr_storage));
124 map_info->nl_client = nl_client;
125 map_info->map_flags = map_flags;
126
127 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
128 if (iwpm_hash_bucket) {
129 hash_bucket_head = get_mapinfo_hash_bucket(
130 &map_info->local_sockaddr,
131 &map_info->mapped_sockaddr);
132 if (hash_bucket_head) {
133 hlist_add_head(&map_info->hlist_node, hash_bucket_head);
134 ret = 0;
135 }
136 }
137 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
138
139 if (!hash_bucket_head)
140 kfree(map_info);
141 return ret;
142}
143
144/**
145 * iwpm_remove_mapinfo - Remove local and mapped IPv4/IPv6 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 */
153int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
154 struct sockaddr_storage *mapped_local_addr)
155{
156 struct hlist_node *tmp_hlist_node;
157 struct hlist_head *hash_bucket_head;
158 struct iwpm_mapping_info *map_info = NULL;
159 unsigned long flags;
160 int ret = -EINVAL;
161
162 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
163 if (iwpm_hash_bucket) {
164 hash_bucket_head = get_mapinfo_hash_bucket(
165 local_sockaddr,
166 mapped_local_addr);
167 if (!hash_bucket_head)
168 goto remove_mapinfo_exit;
169
170 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
171 hash_bucket_head, hlist_node) {
172
173 if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
174 mapped_local_addr)) {
175
176 hlist_del_init(&map_info->hlist_node);
177 kfree(map_info);
178 ret = 0;
179 break;
180 }
181 }
182 }
183remove_mapinfo_exit:
184 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
185 return ret;
186}
187
188static void free_hash_bucket(void)
189{
190 struct hlist_node *tmp_hlist_node;
191 struct iwpm_mapping_info *map_info;
192 unsigned long flags;
193 int i;
194
195 /* remove all the mapinfo data from the list */
196 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
197 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
198 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
199 &iwpm_hash_bucket[i], hlist_node) {
200
201 hlist_del_init(&map_info->hlist_node);
202 kfree(map_info);
203 }
204 }
205 /* free the hash list */
206 kfree(iwpm_hash_bucket);
207 iwpm_hash_bucket = NULL;
208 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
209}
210
211static void free_reminfo_bucket(void)
212{
213 struct hlist_node *tmp_hlist_node;
214 struct iwpm_remote_info *rem_info;
215 unsigned long flags;
216 int i;
217
218 /* remove all the remote info from the list */
219 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
220 for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
221 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
222 &iwpm_reminfo_bucket[i], hlist_node) {
223
224 hlist_del_init(&rem_info->hlist_node);
225 kfree(rem_info);
226 }
227 }
228 /* free the hash list */
229 kfree(iwpm_reminfo_bucket);
230 iwpm_reminfo_bucket = NULL;
231 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
232}
233
234static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
235 struct sockaddr_storage *);
236
237void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
238{
239 struct hlist_head *hash_bucket_head;
240 unsigned long flags;
241
242 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
243 if (iwpm_reminfo_bucket) {
244 hash_bucket_head = get_reminfo_hash_bucket(
245 &rem_info->mapped_loc_sockaddr,
246 &rem_info->mapped_rem_sockaddr);
247 if (hash_bucket_head)
248 hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
249 }
250 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
251}
252
253/**
254 * iwpm_get_remote_info - Get the remote connecting peer address 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 */
264int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
265 struct sockaddr_storage *mapped_rem_addr,
266 struct sockaddr_storage *remote_addr,
267 u8 nl_client)
268{
269 struct hlist_node *tmp_hlist_node;
270 struct hlist_head *hash_bucket_head;
271 struct iwpm_remote_info *rem_info = NULL;
272 unsigned long flags;
273 int ret = -EINVAL;
274
275 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
276 if (iwpm_reminfo_bucket) {
277 hash_bucket_head = get_reminfo_hash_bucket(
278 mapped_loc_addr,
279 mapped_rem_addr);
280 if (!hash_bucket_head)
281 goto get_remote_info_exit;
282 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
283 hash_bucket_head, hlist_node) {
284
285 if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
286 mapped_loc_addr) &&
287 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
288 mapped_rem_addr)) {
289
290 memcpy(remote_addr, &rem_info->remote_sockaddr,
291 sizeof(struct sockaddr_storage));
292 iwpm_print_sockaddr(remote_addr,
293 "get_remote_info: Remote sockaddr:");
294
295 hlist_del_init(&rem_info->hlist_node);
296 kfree(rem_info);
297 ret = 0;
298 break;
299 }
300 }
301 }
302get_remote_info_exit:
303 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
304 return ret;
305}
306
307struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
308 u8 nl_client, gfp_t gfp)
309{
310 struct iwpm_nlmsg_request *nlmsg_request;
311 unsigned long flags;
312
313 nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
314 if (!nlmsg_request)
315 return NULL;
316
317 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
318 list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
319 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
320
321 kref_init(&nlmsg_request->kref);
322 kref_get(&nlmsg_request->kref);
323 nlmsg_request->nlmsg_seq = nlmsg_seq;
324 nlmsg_request->nl_client = nl_client;
325 nlmsg_request->request_done = 0;
326 nlmsg_request->err_code = 0;
327 sema_init(&nlmsg_request->sem, 1);
328 down(&nlmsg_request->sem);
329 return nlmsg_request;
330}
331
332void iwpm_free_nlmsg_request(struct kref *kref)
333{
334 struct iwpm_nlmsg_request *nlmsg_request;
335 unsigned long flags;
336
337 nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
338
339 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
340 list_del_init(&nlmsg_request->inprocess_list);
341 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
342
343 if (!nlmsg_request->request_done)
344 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
345 __func__, nlmsg_request->nlmsg_seq);
346 kfree(nlmsg_request);
347}
348
349struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
350{
351 struct iwpm_nlmsg_request *nlmsg_request;
352 struct iwpm_nlmsg_request *found_request = NULL;
353 unsigned long flags;
354
355 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
356 list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
357 inprocess_list) {
358 if (nlmsg_request->nlmsg_seq == echo_seq) {
359 found_request = nlmsg_request;
360 kref_get(&nlmsg_request->kref);
361 break;
362 }
363 }
364 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
365 return found_request;
366}
367
368int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
369{
370 int ret;
371
372 ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
373 if (ret) {
374 ret = -EINVAL;
375 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
376 __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
377 } else {
378 ret = nlmsg_request->err_code;
379 }
380 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
381 return ret;
382}
383
384int iwpm_get_nlmsg_seq(void)
385{
386 return atomic_inc_return(&iwpm_admin.nlmsg_seq);
387}
388
389/* valid client */
390u32 iwpm_get_registration(u8 nl_client)
391{
392 return iwpm_admin.reg_list[nl_client];
393}
394
395/* valid client */
396void iwpm_set_registration(u8 nl_client, u32 reg)
397{
398 iwpm_admin.reg_list[nl_client] = reg;
399}
400
401/* valid client */
402u32 iwpm_check_registration(u8 nl_client, u32 reg)
403{
404 return (iwpm_get_registration(nl_client) & reg);
405}
406
407int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
408 struct sockaddr_storage *b_sockaddr)
409{
410 if (a_sockaddr->ss_family != b_sockaddr->ss_family)
411 return 1;
412 if (a_sockaddr->ss_family == AF_INET) {
413 struct sockaddr_in *a4_sockaddr =
414 (struct sockaddr_in *)a_sockaddr;
415 struct sockaddr_in *b4_sockaddr =
416 (struct sockaddr_in *)b_sockaddr;
417 if (!memcmp(&a4_sockaddr->sin_addr,
418 &b4_sockaddr->sin_addr, sizeof(struct in_addr))
419 && a4_sockaddr->sin_port == b4_sockaddr->sin_port)
420 return 0;
421
422 } else if (a_sockaddr->ss_family == AF_INET6) {
423 struct sockaddr_in6 *a6_sockaddr =
424 (struct sockaddr_in6 *)a_sockaddr;
425 struct sockaddr_in6 *b6_sockaddr =
426 (struct sockaddr_in6 *)b_sockaddr;
427 if (!memcmp(&a6_sockaddr->sin6_addr,
428 &b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
429 && a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
430 return 0;
431
432 } else {
433 pr_err("%s: Invalid sockaddr family\n", __func__);
434 }
435 return 1;
436}
437
438struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
439 int nl_client)
440{
441 struct sk_buff *skb = NULL;
442
443 skb = dev_alloc_skb(IWPM_MSG_SIZE);
444 if (!skb)
445 goto create_nlmsg_exit;
446
447 if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
448 NLM_F_REQUEST))) {
449 pr_warn("%s: Unable to put the nlmsg header\n", __func__);
450 dev_kfree_skb(skb);
451 skb = NULL;
452 }
453create_nlmsg_exit:
454 return skb;
455}
456
457int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
458 const struct nla_policy *nlmsg_policy,
459 struct nlattr *nltb[], const char *msg_type)
460{
461 int nlh_len = 0;
462 int ret;
463 const char *err_str = "";
464
465 ret = nlmsg_validate_deprecated(cb->nlh, nlh_len, policy_max - 1,
466 nlmsg_policy, NULL);
467 if (ret) {
468 err_str = "Invalid attribute";
469 goto parse_nlmsg_error;
470 }
471 ret = nlmsg_parse_deprecated(cb->nlh, nlh_len, nltb, policy_max - 1,
472 nlmsg_policy, NULL);
473 if (ret) {
474 err_str = "Unable to parse the nlmsg";
475 goto parse_nlmsg_error;
476 }
477 ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
478 if (ret) {
479 err_str = "Invalid NULL attribute";
480 goto parse_nlmsg_error;
481 }
482 return 0;
483parse_nlmsg_error:
484 pr_warn("%s: %s (msg type %s ret = %d)\n",
485 __func__, err_str, msg_type, ret);
486 return ret;
487}
488
489void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
490{
491 struct sockaddr_in6 *sockaddr_v6;
492 struct sockaddr_in *sockaddr_v4;
493
494 switch (sockaddr->ss_family) {
495 case AF_INET:
496 sockaddr_v4 = (struct sockaddr_in *)sockaddr;
497 pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
498 msg, &sockaddr_v4->sin_addr,
499 ntohs(sockaddr_v4->sin_port),
500 ntohs(sockaddr_v4->sin_port));
501 break;
502 case AF_INET6:
503 sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
504 pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
505 msg, &sockaddr_v6->sin6_addr,
506 ntohs(sockaddr_v6->sin6_port),
507 ntohs(sockaddr_v6->sin6_port));
508 break;
509 default:
510 break;
511 }
512}
513
514static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
515{
516 u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
517 u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
518 return hash;
519}
520
521static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
522{
523 u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
524 u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
525 return hash;
526}
527
528static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
529 struct sockaddr_storage *b_sockaddr, u32 *hash)
530{
531 u32 a_hash, b_hash;
532
533 if (a_sockaddr->ss_family == AF_INET) {
534 a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
535 b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
536
537 } else if (a_sockaddr->ss_family == AF_INET6) {
538 a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
539 b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
540 } else {
541 pr_err("%s: Invalid sockaddr family\n", __func__);
542 return -EINVAL;
543 }
544
545 if (a_hash == b_hash) /* if port mapper isn't available */
546 *hash = a_hash;
547 else
548 *hash = jhash_2words(a_hash, b_hash, 0);
549 return 0;
550}
551
552static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
553 *local_sockaddr, struct sockaddr_storage
554 *mapped_sockaddr)
555{
556 u32 hash;
557 int ret;
558
559 ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
560 if (ret)
561 return NULL;
562 return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
563}
564
565static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
566 *mapped_loc_sockaddr, struct sockaddr_storage
567 *mapped_rem_sockaddr)
568{
569 u32 hash;
570 int ret;
571
572 ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
573 if (ret)
574 return NULL;
575 return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
576}
577
578static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
579{
580 struct sk_buff *skb = NULL;
581 struct nlmsghdr *nlh;
582 u32 msg_seq;
583 const char *err_str = "";
584 int ret = -EINVAL;
585
586 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
587 if (!skb) {
588 err_str = "Unable to create a nlmsg";
589 goto mapinfo_num_error;
590 }
591 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
592 msg_seq = 0;
593 err_str = "Unable to put attribute of mapinfo number nlmsg";
594 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
595 if (ret)
596 goto mapinfo_num_error;
597 ret = ibnl_put_attr(skb, nlh, sizeof(u32),
598 &mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
599 if (ret)
600 goto mapinfo_num_error;
601
602 nlmsg_end(skb, nlh);
603
604 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
605 if (ret) {
606 skb = NULL;
607 err_str = "Unable to send a nlmsg";
608 goto mapinfo_num_error;
609 }
610 pr_debug("%s: Sent mapping number = %u\n", __func__, mapping_num);
611 return 0;
612mapinfo_num_error:
613 pr_info("%s: %s\n", __func__, err_str);
614 dev_kfree_skb(skb);
615 return ret;
616}
617
618static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
619{
620 struct nlmsghdr *nlh = NULL;
621 int ret = 0;
622
623 if (!skb)
624 return ret;
625 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
626 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
627 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
628 dev_kfree_skb(skb);
629 return -ENOMEM;
630 }
631 nlh->nlmsg_type = NLMSG_DONE;
632 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
633 if (ret)
634 pr_warn("%s Unable to send a nlmsg\n", __func__);
635 return ret;
636}
637
638int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
639{
640 struct iwpm_mapping_info *map_info;
641 struct sk_buff *skb = NULL;
642 struct nlmsghdr *nlh;
643 int skb_num = 0, mapping_num = 0;
644 int i = 0, nlmsg_bytes = 0;
645 unsigned long flags;
646 const char *err_str = "";
647 int ret;
648
649 skb = dev_alloc_skb(NLMSG_GOODSIZE);
650 if (!skb) {
651 ret = -ENOMEM;
652 err_str = "Unable to allocate skb";
653 goto send_mapping_info_exit;
654 }
655 skb_num++;
656 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
657 ret = -EINVAL;
658 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
659 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
660 hlist_node) {
661 if (map_info->nl_client != nl_client)
662 continue;
663 nlh = NULL;
664 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
665 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
666 ret = -ENOMEM;
667 err_str = "Unable to put the nlmsg header";
668 goto send_mapping_info_unlock;
669 }
670 err_str = "Unable to put attribute of the nlmsg";
671 ret = ibnl_put_attr(skb, nlh,
672 sizeof(struct sockaddr_storage),
673 &map_info->local_sockaddr,
674 IWPM_NLA_MAPINFO_LOCAL_ADDR);
675 if (ret)
676 goto send_mapping_info_unlock;
677
678 ret = ibnl_put_attr(skb, nlh,
679 sizeof(struct sockaddr_storage),
680 &map_info->mapped_sockaddr,
681 IWPM_NLA_MAPINFO_MAPPED_ADDR);
682 if (ret)
683 goto send_mapping_info_unlock;
684
685 if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) {
686 ret = ibnl_put_attr(skb, nlh, sizeof(u32),
687 &map_info->map_flags,
688 IWPM_NLA_MAPINFO_FLAGS);
689 if (ret)
690 goto send_mapping_info_unlock;
691 }
692
693 nlmsg_end(skb, nlh);
694
695 iwpm_print_sockaddr(&map_info->local_sockaddr,
696 "send_mapping_info: Local sockaddr:");
697 iwpm_print_sockaddr(&map_info->mapped_sockaddr,
698 "send_mapping_info: Mapped local sockaddr:");
699 mapping_num++;
700 nlmsg_bytes += nlh->nlmsg_len;
701
702 /* check if all mappings can fit in one skb */
703 if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
704 /* and leave room for NLMSG_DONE */
705 nlmsg_bytes = 0;
706 skb_num++;
707 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
708 flags);
709 /* send the skb */
710 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
711 skb = NULL;
712 if (ret) {
713 err_str = "Unable to send map info";
714 goto send_mapping_info_exit;
715 }
716 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
717 ret = -ENOMEM;
718 err_str = "Insufficient skbs for map info";
719 goto send_mapping_info_exit;
720 }
721 skb = dev_alloc_skb(NLMSG_GOODSIZE);
722 if (!skb) {
723 ret = -ENOMEM;
724 err_str = "Unable to allocate skb";
725 goto send_mapping_info_exit;
726 }
727 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
728 }
729 }
730 }
731send_mapping_info_unlock:
732 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
733send_mapping_info_exit:
734 if (ret) {
735 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
736 dev_kfree_skb(skb);
737 return ret;
738 }
739 send_nlmsg_done(skb, nl_client, iwpm_pid);
740 return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
741}
742
743int iwpm_mapinfo_available(void)
744{
745 unsigned long flags;
746 int full_bucket = 0, i = 0;
747
748 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
749 if (iwpm_hash_bucket) {
750 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
751 if (!hlist_empty(&iwpm_hash_bucket[i])) {
752 full_bucket = 1;
753 break;
754 }
755 }
756 }
757 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
758 return full_bucket;
759}
760
761int iwpm_send_hello(u8 nl_client, int iwpm_pid, u16 abi_version)
762{
763 struct sk_buff *skb = NULL;
764 struct nlmsghdr *nlh;
765 const char *err_str;
766 int ret = -EINVAL;
767
768 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_HELLO, &nlh, nl_client);
769 if (!skb) {
770 err_str = "Unable to create a nlmsg";
771 goto hello_num_error;
772 }
773 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
774 err_str = "Unable to put attribute of abi_version into nlmsg";
775 ret = ibnl_put_attr(skb, nlh, sizeof(u16), &abi_version,
776 IWPM_NLA_HELLO_ABI_VERSION);
777 if (ret)
778 goto hello_num_error;
779 nlmsg_end(skb, nlh);
780
781 ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
782 if (ret) {
783 skb = NULL;
784 err_str = "Unable to send a nlmsg";
785 goto hello_num_error;
786 }
787 pr_debug("%s: Sent hello abi_version = %u\n", __func__, abi_version);
788 return 0;
789hello_num_error:
790 pr_info("%s: %s\n", __func__, err_str);
791 dev_kfree_skb(skb);
792 return ret;
793}
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
42static LIST_HEAD(iwpm_nlmsg_req_list);
43static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
44
45static struct hlist_head *iwpm_hash_bucket;
46static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
47
48static struct hlist_head *iwpm_reminfo_bucket;
49static DEFINE_SPINLOCK(iwpm_reminfo_lock);
50
51static DEFINE_MUTEX(iwpm_admin_lock);
52static struct iwpm_admin_data iwpm_admin;
53
54int iwpm_init(u8 nl_client)
55{
56 int ret = 0;
57 mutex_lock(&iwpm_admin_lock);
58 if (atomic_read(&iwpm_admin.refcount) == 0) {
59 iwpm_hash_bucket = kzalloc(IWPM_MAPINFO_HASH_SIZE *
60 sizeof(struct hlist_head), GFP_KERNEL);
61 if (!iwpm_hash_bucket) {
62 ret = -ENOMEM;
63 goto init_exit;
64 }
65 iwpm_reminfo_bucket = kzalloc(IWPM_REMINFO_HASH_SIZE *
66 sizeof(struct hlist_head), GFP_KERNEL);
67 if (!iwpm_reminfo_bucket) {
68 kfree(iwpm_hash_bucket);
69 ret = -ENOMEM;
70 goto init_exit;
71 }
72 }
73 atomic_inc(&iwpm_admin.refcount);
74init_exit:
75 mutex_unlock(&iwpm_admin_lock);
76 if (!ret) {
77 iwpm_set_valid(nl_client, 1);
78 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
79 pr_debug("%s: Mapinfo and reminfo tables are created\n",
80 __func__);
81 }
82 return ret;
83}
84
85static void free_hash_bucket(void);
86static void free_reminfo_bucket(void);
87
88int iwpm_exit(u8 nl_client)
89{
90
91 if (!iwpm_valid_client(nl_client))
92 return -EINVAL;
93 mutex_lock(&iwpm_admin_lock);
94 if (atomic_read(&iwpm_admin.refcount) == 0) {
95 mutex_unlock(&iwpm_admin_lock);
96 pr_err("%s Incorrect usage - negative refcount\n", __func__);
97 return -EINVAL;
98 }
99 if (atomic_dec_and_test(&iwpm_admin.refcount)) {
100 free_hash_bucket();
101 free_reminfo_bucket();
102 pr_debug("%s: Resources are destroyed\n", __func__);
103 }
104 mutex_unlock(&iwpm_admin_lock);
105 iwpm_set_valid(nl_client, 0);
106 iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
107 return 0;
108}
109
110static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
111 struct sockaddr_storage *);
112
113int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
114 struct sockaddr_storage *mapped_sockaddr,
115 u8 nl_client)
116{
117 struct hlist_head *hash_bucket_head = NULL;
118 struct iwpm_mapping_info *map_info;
119 unsigned long flags;
120 int ret = -EINVAL;
121
122 if (!iwpm_valid_client(nl_client))
123 return ret;
124 map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
125 if (!map_info)
126 return -ENOMEM;
127
128 memcpy(&map_info->local_sockaddr, local_sockaddr,
129 sizeof(struct sockaddr_storage));
130 memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
131 sizeof(struct sockaddr_storage));
132 map_info->nl_client = nl_client;
133
134 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
135 if (iwpm_hash_bucket) {
136 hash_bucket_head = get_mapinfo_hash_bucket(
137 &map_info->local_sockaddr,
138 &map_info->mapped_sockaddr);
139 if (hash_bucket_head) {
140 hlist_add_head(&map_info->hlist_node, hash_bucket_head);
141 ret = 0;
142 }
143 }
144 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
145
146 if (!hash_bucket_head)
147 kfree(map_info);
148 return ret;
149}
150
151int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
152 struct sockaddr_storage *mapped_local_addr)
153{
154 struct hlist_node *tmp_hlist_node;
155 struct hlist_head *hash_bucket_head;
156 struct iwpm_mapping_info *map_info = NULL;
157 unsigned long flags;
158 int ret = -EINVAL;
159
160 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
161 if (iwpm_hash_bucket) {
162 hash_bucket_head = get_mapinfo_hash_bucket(
163 local_sockaddr,
164 mapped_local_addr);
165 if (!hash_bucket_head)
166 goto remove_mapinfo_exit;
167
168 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
169 hash_bucket_head, hlist_node) {
170
171 if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
172 mapped_local_addr)) {
173
174 hlist_del_init(&map_info->hlist_node);
175 kfree(map_info);
176 ret = 0;
177 break;
178 }
179 }
180 }
181remove_mapinfo_exit:
182 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
183 return ret;
184}
185
186static void free_hash_bucket(void)
187{
188 struct hlist_node *tmp_hlist_node;
189 struct iwpm_mapping_info *map_info;
190 unsigned long flags;
191 int i;
192
193 /* remove all the mapinfo data from the list */
194 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
195 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
196 hlist_for_each_entry_safe(map_info, tmp_hlist_node,
197 &iwpm_hash_bucket[i], hlist_node) {
198
199 hlist_del_init(&map_info->hlist_node);
200 kfree(map_info);
201 }
202 }
203 /* free the hash list */
204 kfree(iwpm_hash_bucket);
205 iwpm_hash_bucket = NULL;
206 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
207}
208
209static void free_reminfo_bucket(void)
210{
211 struct hlist_node *tmp_hlist_node;
212 struct iwpm_remote_info *rem_info;
213 unsigned long flags;
214 int i;
215
216 /* remove all the remote info from the list */
217 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
218 for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
219 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
220 &iwpm_reminfo_bucket[i], hlist_node) {
221
222 hlist_del_init(&rem_info->hlist_node);
223 kfree(rem_info);
224 }
225 }
226 /* free the hash list */
227 kfree(iwpm_reminfo_bucket);
228 iwpm_reminfo_bucket = NULL;
229 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
230}
231
232static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
233 struct sockaddr_storage *);
234
235void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
236{
237 struct hlist_head *hash_bucket_head;
238 unsigned long flags;
239
240 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
241 if (iwpm_reminfo_bucket) {
242 hash_bucket_head = get_reminfo_hash_bucket(
243 &rem_info->mapped_loc_sockaddr,
244 &rem_info->mapped_rem_sockaddr);
245 if (hash_bucket_head)
246 hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
247 }
248 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
249}
250
251int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
252 struct sockaddr_storage *mapped_rem_addr,
253 struct sockaddr_storage *remote_addr,
254 u8 nl_client)
255{
256 struct hlist_node *tmp_hlist_node;
257 struct hlist_head *hash_bucket_head;
258 struct iwpm_remote_info *rem_info = NULL;
259 unsigned long flags;
260 int ret = -EINVAL;
261
262 if (!iwpm_valid_client(nl_client)) {
263 pr_info("%s: Invalid client = %d\n", __func__, nl_client);
264 return ret;
265 }
266 spin_lock_irqsave(&iwpm_reminfo_lock, flags);
267 if (iwpm_reminfo_bucket) {
268 hash_bucket_head = get_reminfo_hash_bucket(
269 mapped_loc_addr,
270 mapped_rem_addr);
271 if (!hash_bucket_head)
272 goto get_remote_info_exit;
273 hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
274 hash_bucket_head, hlist_node) {
275
276 if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
277 mapped_loc_addr) &&
278 !iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
279 mapped_rem_addr)) {
280
281 memcpy(remote_addr, &rem_info->remote_sockaddr,
282 sizeof(struct sockaddr_storage));
283 iwpm_print_sockaddr(remote_addr,
284 "get_remote_info: Remote sockaddr:");
285
286 hlist_del_init(&rem_info->hlist_node);
287 kfree(rem_info);
288 ret = 0;
289 break;
290 }
291 }
292 }
293get_remote_info_exit:
294 spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
295 return ret;
296}
297
298struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
299 u8 nl_client, gfp_t gfp)
300{
301 struct iwpm_nlmsg_request *nlmsg_request = NULL;
302 unsigned long flags;
303
304 nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
305 if (!nlmsg_request)
306 return NULL;
307
308 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
309 list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
310 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
311
312 kref_init(&nlmsg_request->kref);
313 kref_get(&nlmsg_request->kref);
314 nlmsg_request->nlmsg_seq = nlmsg_seq;
315 nlmsg_request->nl_client = nl_client;
316 nlmsg_request->request_done = 0;
317 nlmsg_request->err_code = 0;
318 sema_init(&nlmsg_request->sem, 1);
319 down(&nlmsg_request->sem);
320 return nlmsg_request;
321}
322
323void iwpm_free_nlmsg_request(struct kref *kref)
324{
325 struct iwpm_nlmsg_request *nlmsg_request;
326 unsigned long flags;
327
328 nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
329
330 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
331 list_del_init(&nlmsg_request->inprocess_list);
332 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
333
334 if (!nlmsg_request->request_done)
335 pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
336 __func__, nlmsg_request->nlmsg_seq);
337 kfree(nlmsg_request);
338}
339
340struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
341{
342 struct iwpm_nlmsg_request *nlmsg_request;
343 struct iwpm_nlmsg_request *found_request = NULL;
344 unsigned long flags;
345
346 spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
347 list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
348 inprocess_list) {
349 if (nlmsg_request->nlmsg_seq == echo_seq) {
350 found_request = nlmsg_request;
351 kref_get(&nlmsg_request->kref);
352 break;
353 }
354 }
355 spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
356 return found_request;
357}
358
359int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
360{
361 int ret;
362
363 ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
364 if (ret) {
365 ret = -EINVAL;
366 pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
367 __func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
368 } else {
369 ret = nlmsg_request->err_code;
370 }
371 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
372 return ret;
373}
374
375int iwpm_get_nlmsg_seq(void)
376{
377 return atomic_inc_return(&iwpm_admin.nlmsg_seq);
378}
379
380int iwpm_valid_client(u8 nl_client)
381{
382 return iwpm_admin.client_list[nl_client];
383}
384
385void iwpm_set_valid(u8 nl_client, int valid)
386{
387 iwpm_admin.client_list[nl_client] = valid;
388}
389
390/* valid client */
391u32 iwpm_get_registration(u8 nl_client)
392{
393 return iwpm_admin.reg_list[nl_client];
394}
395
396/* valid client */
397void iwpm_set_registration(u8 nl_client, u32 reg)
398{
399 iwpm_admin.reg_list[nl_client] = reg;
400}
401
402/* valid client */
403u32 iwpm_check_registration(u8 nl_client, u32 reg)
404{
405 return (iwpm_get_registration(nl_client) & reg);
406}
407
408int 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
439struct 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 }
454create_nlmsg_exit:
455 return skb;
456}
457
458int 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(cb->nlh, nlh_len, policy_max - 1, nlmsg_policy,
467 NULL);
468 if (ret) {
469 err_str = "Invalid attribute";
470 goto parse_nlmsg_error;
471 }
472 ret = nlmsg_parse(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;
484parse_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
490void 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
515static 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
522static 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
529static 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
553static 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
566static 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
579static 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(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 = %d\n", __func__, mapping_num);
612 return 0;
613mapinfo_num_error:
614 pr_info("%s: %s\n", __func__, err_str);
615 if (skb)
616 dev_kfree_skb(skb);
617 return ret;
618}
619
620static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
621{
622 struct nlmsghdr *nlh = NULL;
623 int ret = 0;
624
625 if (!skb)
626 return ret;
627 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
628 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
629 pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
630 dev_kfree_skb(skb);
631 return -ENOMEM;
632 }
633 nlh->nlmsg_type = NLMSG_DONE;
634 ret = rdma_nl_unicast(skb, iwpm_pid);
635 if (ret)
636 pr_warn("%s Unable to send a nlmsg\n", __func__);
637 return ret;
638}
639
640int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
641{
642 struct iwpm_mapping_info *map_info;
643 struct sk_buff *skb = NULL;
644 struct nlmsghdr *nlh;
645 int skb_num = 0, mapping_num = 0;
646 int i = 0, nlmsg_bytes = 0;
647 unsigned long flags;
648 const char *err_str = "";
649 int ret;
650
651 skb = dev_alloc_skb(NLMSG_GOODSIZE);
652 if (!skb) {
653 ret = -ENOMEM;
654 err_str = "Unable to allocate skb";
655 goto send_mapping_info_exit;
656 }
657 skb_num++;
658 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
659 ret = -EINVAL;
660 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
661 hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
662 hlist_node) {
663 if (map_info->nl_client != nl_client)
664 continue;
665 nlh = NULL;
666 if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
667 RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
668 ret = -ENOMEM;
669 err_str = "Unable to put the nlmsg header";
670 goto send_mapping_info_unlock;
671 }
672 err_str = "Unable to put attribute of the nlmsg";
673 ret = ibnl_put_attr(skb, nlh,
674 sizeof(struct sockaddr_storage),
675 &map_info->local_sockaddr,
676 IWPM_NLA_MAPINFO_LOCAL_ADDR);
677 if (ret)
678 goto send_mapping_info_unlock;
679
680 ret = ibnl_put_attr(skb, nlh,
681 sizeof(struct sockaddr_storage),
682 &map_info->mapped_sockaddr,
683 IWPM_NLA_MAPINFO_MAPPED_ADDR);
684 if (ret)
685 goto send_mapping_info_unlock;
686
687 nlmsg_end(skb, nlh);
688
689 iwpm_print_sockaddr(&map_info->local_sockaddr,
690 "send_mapping_info: Local sockaddr:");
691 iwpm_print_sockaddr(&map_info->mapped_sockaddr,
692 "send_mapping_info: Mapped local sockaddr:");
693 mapping_num++;
694 nlmsg_bytes += nlh->nlmsg_len;
695
696 /* check if all mappings can fit in one skb */
697 if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
698 /* and leave room for NLMSG_DONE */
699 nlmsg_bytes = 0;
700 skb_num++;
701 spin_unlock_irqrestore(&iwpm_mapinfo_lock,
702 flags);
703 /* send the skb */
704 ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
705 skb = NULL;
706 if (ret) {
707 err_str = "Unable to send map info";
708 goto send_mapping_info_exit;
709 }
710 if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
711 ret = -ENOMEM;
712 err_str = "Insufficient skbs for map info";
713 goto send_mapping_info_exit;
714 }
715 skb = dev_alloc_skb(NLMSG_GOODSIZE);
716 if (!skb) {
717 ret = -ENOMEM;
718 err_str = "Unable to allocate skb";
719 goto send_mapping_info_exit;
720 }
721 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
722 }
723 }
724 }
725send_mapping_info_unlock:
726 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
727send_mapping_info_exit:
728 if (ret) {
729 pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
730 if (skb)
731 dev_kfree_skb(skb);
732 return ret;
733 }
734 send_nlmsg_done(skb, nl_client, iwpm_pid);
735 return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
736}
737
738int iwpm_mapinfo_available(void)
739{
740 unsigned long flags;
741 int full_bucket = 0, i = 0;
742
743 spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
744 if (iwpm_hash_bucket) {
745 for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
746 if (!hlist_empty(&iwpm_hash_bucket[i])) {
747 full_bucket = 1;
748 break;
749 }
750 }
751 }
752 spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
753 return full_bucket;
754}