RDMA/cma: Let cma_resolve_ib_dev() continue search even after empty entry
[sfrench/cifs-2.6.git] / drivers / infiniband / core / iwpm_util.c
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  */
59 int 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
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  */
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  */
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(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  */
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
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
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
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  */
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
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 = NULL;
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
332 void 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
349 struct 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
368 int 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
384 int iwpm_get_nlmsg_seq(void)
385 {
386         return atomic_inc_return(&iwpm_admin.nlmsg_seq);
387 }
388
389 /* valid client */
390 u32 iwpm_get_registration(u8 nl_client)
391 {
392         return iwpm_admin.reg_list[nl_client];
393 }
394
395 /* valid client */
396 void iwpm_set_registration(u8 nl_client, u32 reg)
397 {
398         iwpm_admin.reg_list[nl_client] = reg;
399 }
400
401 /* valid client */
402 u32 iwpm_check_registration(u8 nl_client, u32 reg)
403 {
404         return (iwpm_get_registration(nl_client) & reg);
405 }
406
407 int 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
438 struct 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         }
453 create_nlmsg_exit:
454         return skb;
455 }
456
457 int 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;
483 parse_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
489 void 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
514 static 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
521 static 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
528 static 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
552 static 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
565 static 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
578 static 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;
612 mapinfo_num_error:
613         pr_info("%s: %s\n", __func__, err_str);
614         dev_kfree_skb(skb);
615         return ret;
616 }
617
618 static 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
638 int 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         }
731 send_mapping_info_unlock:
732         spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
733 send_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
743 int 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
761 int 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;
789 hello_num_error:
790         pr_info("%s: %s\n", __func__, err_str);
791         dev_kfree_skb(skb);
792         return ret;
793 }