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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / infiniband / core / iwpm_msg.c
blob46686990a8271aeba274071b8718e9c48a4f4fb3
1 /*
2 * Copyright (c) 2014 Intel Corporation. All rights reserved.
3 * Copyright (c) 2014 Chelsio, Inc. 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 static const char iwpm_ulib_name[IWPM_ULIBNAME_SIZE] = "iWarpPortMapperUser";
37 u16 iwpm_ulib_version = IWPM_UABI_VERSION_MIN;
38 static int iwpm_user_pid = IWPM_PID_UNDEFINED;
39 static atomic_t echo_nlmsg_seq;
40
41 /**
42 * iwpm_valid_pid - Check if the userspace iwarp port mapper pid is valid
43 *
44 * Returns true if the pid is greater than zero, otherwise returns false
45 */
46 int iwpm_valid_pid(void)
47 {
48 return iwpm_user_pid > 0;
49 }
50
51 /**
52 * iwpm_register_pid - Send a netlink query to userspace
53 * to get the iwarp port mapper pid
54 * @pm_msg: Contains driver info to send to the userspace port mapper
55 * @nl_client: The index of the netlink client
56 *
57 * nlmsg attributes:
58 * [IWPM_NLA_REG_PID_SEQ]
59 * [IWPM_NLA_REG_IF_NAME]
60 * [IWPM_NLA_REG_IBDEV_NAME]
61 * [IWPM_NLA_REG_ULIB_NAME]
62 */
63 int iwpm_register_pid(struct iwpm_dev_data *pm_msg, u8 nl_client)
64 {
65 struct sk_buff *skb = NULL;
66 struct iwpm_nlmsg_request *nlmsg_request = NULL;
67 struct nlmsghdr *nlh;
68 u32 msg_seq;
69 const char *err_str = "";
70 int ret = -EINVAL;
71
72 if (!iwpm_valid_client(nl_client)) {
73 err_str = "Invalid port mapper client";
74 goto pid_query_error;
75 }
76 if (iwpm_check_registration(nl_client, IWPM_REG_VALID) ||
77 iwpm_user_pid == IWPM_PID_UNAVAILABLE)
78 return 0;
79 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_REG_PID, &nlh, nl_client);
80 if (!skb) {
81 err_str = "Unable to create a nlmsg";
82 goto pid_query_error;
83 }
84 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
85 nlmsg_request = iwpm_get_nlmsg_request(nlh->nlmsg_seq, nl_client, GFP_KERNEL);
86 if (!nlmsg_request) {
87 err_str = "Unable to allocate netlink request";
88 goto pid_query_error;
89 }
90 msg_seq = atomic_read(&echo_nlmsg_seq);
91
92 /* fill in the pid request message */
93 err_str = "Unable to put attribute of the nlmsg";
94 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_REG_PID_SEQ);
95 if (ret)
96 goto pid_query_error;
97 ret = ibnl_put_attr(skb, nlh, IFNAMSIZ,
98 pm_msg->if_name, IWPM_NLA_REG_IF_NAME);
99 if (ret)
100 goto pid_query_error;
101 ret = ibnl_put_attr(skb, nlh, IWPM_DEVNAME_SIZE,
102 pm_msg->dev_name, IWPM_NLA_REG_IBDEV_NAME);
103 if (ret)
104 goto pid_query_error;
105 ret = ibnl_put_attr(skb, nlh, IWPM_ULIBNAME_SIZE,
106 (char *)iwpm_ulib_name, IWPM_NLA_REG_ULIB_NAME);
107 if (ret)
108 goto pid_query_error;
109
110 nlmsg_end(skb, nlh);
111
112 pr_debug("%s: Multicasting a nlmsg (dev = %s ifname = %s iwpm = %s)\n",
113 __func__, pm_msg->dev_name, pm_msg->if_name, iwpm_ulib_name);
114
115 ret = rdma_nl_multicast(&init_net, skb, RDMA_NL_GROUP_IWPM, GFP_KERNEL);
116 if (ret) {
117 skb = NULL; /* skb is freed in the netlink send-op handling */
118 iwpm_user_pid = IWPM_PID_UNAVAILABLE;
119 err_str = "Unable to send a nlmsg";
120 goto pid_query_error;
121 }
122 nlmsg_request->req_buffer = pm_msg;
123 ret = iwpm_wait_complete_req(nlmsg_request);
124 return ret;
125 pid_query_error:
126 pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
127 dev_kfree_skb(skb);
128 if (nlmsg_request)
129 iwpm_free_nlmsg_request(&nlmsg_request->kref);
130 return ret;
131 }
132
133 /**
134 * iwpm_add_mapping - Send a netlink add mapping request to
135 * the userspace port mapper
136 * @pm_msg: Contains the local ip/tcp address info to send
137 * @nl_client: The index of the netlink client
138 *
139 * nlmsg attributes:
140 * [IWPM_NLA_MANAGE_MAPPING_SEQ]
141 * [IWPM_NLA_MANAGE_ADDR]
142 * [IWPM_NLA_MANAGE_FLAGS]
143 *
144 * If the request is successful, the pm_msg stores
145 * the port mapper response (mapped address info)
146 */
147 int iwpm_add_mapping(struct iwpm_sa_data *pm_msg, u8 nl_client)
148 {
149 struct sk_buff *skb = NULL;
150 struct iwpm_nlmsg_request *nlmsg_request = NULL;
151 struct nlmsghdr *nlh;
152 u32 msg_seq;
153 const char *err_str = "";
154 int ret = -EINVAL;
155
156 if (!iwpm_valid_client(nl_client)) {
157 err_str = "Invalid port mapper client";
158 goto add_mapping_error;
159 }
160 if (!iwpm_valid_pid())
161 return 0;
162 if (!iwpm_check_registration(nl_client, IWPM_REG_VALID)) {
163 err_str = "Unregistered port mapper client";
164 goto add_mapping_error;
165 }
166 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_ADD_MAPPING, &nlh, nl_client);
167 if (!skb) {
168 err_str = "Unable to create a nlmsg";
169 goto add_mapping_error;
170 }
171 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
172 nlmsg_request = iwpm_get_nlmsg_request(nlh->nlmsg_seq, nl_client, GFP_KERNEL);
173 if (!nlmsg_request) {
174 err_str = "Unable to allocate netlink request";
175 goto add_mapping_error;
176 }
177 msg_seq = atomic_read(&echo_nlmsg_seq);
178 /* fill in the add mapping message */
179 err_str = "Unable to put attribute of the nlmsg";
180 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq,
181 IWPM_NLA_MANAGE_MAPPING_SEQ);
182 if (ret)
183 goto add_mapping_error;
184 ret = ibnl_put_attr(skb, nlh, sizeof(struct sockaddr_storage),
185 &pm_msg->loc_addr, IWPM_NLA_MANAGE_ADDR);
186 if (ret)
187 goto add_mapping_error;
188
189 /* If flags are required and we're not V4, then return a quiet error */
190 if (pm_msg->flags && iwpm_ulib_version == IWPM_UABI_VERSION_MIN) {
191 ret = -EINVAL;
192 goto add_mapping_error_nowarn;
193 }
194 if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) {
195 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &pm_msg->flags,
196 IWPM_NLA_MANAGE_FLAGS);
197 if (ret)
198 goto add_mapping_error;
199 }
200
201 nlmsg_end(skb, nlh);
202 nlmsg_request->req_buffer = pm_msg;
203
204 ret = rdma_nl_unicast_wait(&init_net, skb, iwpm_user_pid);
205 if (ret) {
206 skb = NULL; /* skb is freed in the netlink send-op handling */
207 iwpm_user_pid = IWPM_PID_UNDEFINED;
208 err_str = "Unable to send a nlmsg";
209 goto add_mapping_error;
210 }
211 ret = iwpm_wait_complete_req(nlmsg_request);
212 return ret;
213 add_mapping_error:
214 pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
215 add_mapping_error_nowarn:
216 dev_kfree_skb(skb);
217 if (nlmsg_request)
218 iwpm_free_nlmsg_request(&nlmsg_request->kref);
219 return ret;
220 }
221
222 /**
223 * iwpm_add_and_query_mapping - Process the port mapper response to
224 * iwpm_add_and_query_mapping request
225 * @pm_msg: Contains the local ip/tcp address info to send
226 * @nl_client: The index of the netlink client
227 *
228 * nlmsg attributes:
229 * [IWPM_NLA_QUERY_MAPPING_SEQ]
230 * [IWPM_NLA_QUERY_LOCAL_ADDR]
231 * [IWPM_NLA_QUERY_REMOTE_ADDR]
232 * [IWPM_NLA_QUERY_FLAGS]
233 */
234 int iwpm_add_and_query_mapping(struct iwpm_sa_data *pm_msg, u8 nl_client)
235 {
236 struct sk_buff *skb = NULL;
237 struct iwpm_nlmsg_request *nlmsg_request = NULL;
238 struct nlmsghdr *nlh;
239 u32 msg_seq;
240 const char *err_str = "";
241 int ret = -EINVAL;
242
243 if (!iwpm_valid_client(nl_client)) {
244 err_str = "Invalid port mapper client";
245 goto query_mapping_error;
246 }
247 if (!iwpm_valid_pid())
248 return 0;
249 if (!iwpm_check_registration(nl_client, IWPM_REG_VALID)) {
250 err_str = "Unregistered port mapper client";
251 goto query_mapping_error;
252 }
253 ret = -ENOMEM;
254 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_QUERY_MAPPING, &nlh, nl_client);
255 if (!skb) {
256 err_str = "Unable to create a nlmsg";
257 goto query_mapping_error;
258 }
259 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
260 nlmsg_request = iwpm_get_nlmsg_request(nlh->nlmsg_seq,
261 nl_client, GFP_KERNEL);
262 if (!nlmsg_request) {
263 err_str = "Unable to allocate netlink request";
264 goto query_mapping_error;
265 }
266 msg_seq = atomic_read(&echo_nlmsg_seq);
267
268 /* fill in the query message */
269 err_str = "Unable to put attribute of the nlmsg";
270 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq,
271 IWPM_NLA_QUERY_MAPPING_SEQ);
272 if (ret)
273 goto query_mapping_error;
274 ret = ibnl_put_attr(skb, nlh, sizeof(struct sockaddr_storage),
275 &pm_msg->loc_addr, IWPM_NLA_QUERY_LOCAL_ADDR);
276 if (ret)
277 goto query_mapping_error;
278 ret = ibnl_put_attr(skb, nlh, sizeof(struct sockaddr_storage),
279 &pm_msg->rem_addr, IWPM_NLA_QUERY_REMOTE_ADDR);
280 if (ret)
281 goto query_mapping_error;
282
283 /* If flags are required and we're not V4, then return a quite error */
284 if (pm_msg->flags && iwpm_ulib_version == IWPM_UABI_VERSION_MIN) {
285 ret = -EINVAL;
286 goto query_mapping_error_nowarn;
287 }
288 if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) {
289 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &pm_msg->flags,
290 IWPM_NLA_QUERY_FLAGS);
291 if (ret)
292 goto query_mapping_error;
293 }
294
295 nlmsg_end(skb, nlh);
296 nlmsg_request->req_buffer = pm_msg;
297
298 ret = rdma_nl_unicast_wait(&init_net, skb, iwpm_user_pid);
299 if (ret) {
300 skb = NULL; /* skb is freed in the netlink send-op handling */
301 err_str = "Unable to send a nlmsg";
302 goto query_mapping_error;
303 }
304 ret = iwpm_wait_complete_req(nlmsg_request);
305 return ret;
306 query_mapping_error:
307 pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
308 query_mapping_error_nowarn:
309 dev_kfree_skb(skb);
310 if (nlmsg_request)
311 iwpm_free_nlmsg_request(&nlmsg_request->kref);
312 return ret;
313 }
314
315 /**
316 * iwpm_remove_mapping - Send a netlink remove mapping request
317 * to the userspace port mapper
318 *
319 * @local_addr: Local ip/tcp address to remove
320 * @nl_client: The index of the netlink client
321 *
322 * nlmsg attributes:
323 * [IWPM_NLA_MANAGE_MAPPING_SEQ]
324 * [IWPM_NLA_MANAGE_ADDR]
325 */
326 int iwpm_remove_mapping(struct sockaddr_storage *local_addr, u8 nl_client)
327 {
328 struct sk_buff *skb = NULL;
329 struct nlmsghdr *nlh;
330 u32 msg_seq;
331 const char *err_str = "";
332 int ret = -EINVAL;
333
334 if (!iwpm_valid_client(nl_client)) {
335 err_str = "Invalid port mapper client";
336 goto remove_mapping_error;
337 }
338 if (!iwpm_valid_pid())
339 return 0;
340 if (iwpm_check_registration(nl_client, IWPM_REG_UNDEF)) {
341 err_str = "Unregistered port mapper client";
342 goto remove_mapping_error;
343 }
344 skb = iwpm_create_nlmsg(RDMA_NL_IWPM_REMOVE_MAPPING, &nlh, nl_client);
345 if (!skb) {
346 ret = -ENOMEM;
347 err_str = "Unable to create a nlmsg";
348 goto remove_mapping_error;
349 }
350 msg_seq = atomic_read(&echo_nlmsg_seq);
351 nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
352 err_str = "Unable to put attribute of the nlmsg";
353 ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq,
354 IWPM_NLA_MANAGE_MAPPING_SEQ);
355 if (ret)
356 goto remove_mapping_error;
357 ret = ibnl_put_attr(skb, nlh, sizeof(struct sockaddr_storage),
358 local_addr, IWPM_NLA_MANAGE_ADDR);
359 if (ret)
360 goto remove_mapping_error;
361
362 nlmsg_end(skb, nlh);
363
364 ret = rdma_nl_unicast_wait(&init_net, skb, iwpm_user_pid);
365 if (ret) {
366 skb = NULL; /* skb is freed in the netlink send-op handling */
367 iwpm_user_pid = IWPM_PID_UNDEFINED;
368 err_str = "Unable to send a nlmsg";
369 goto remove_mapping_error;
370 }
371 iwpm_print_sockaddr(local_addr,
372 "remove_mapping: Local sockaddr:");
373 return 0;
374 remove_mapping_error:
375 pr_info("%s: %s (client = %d)\n", __func__, err_str, nl_client);
376 if (skb)
377 dev_kfree_skb_any(skb);
378 return ret;
379 }
380
381 /* netlink attribute policy for the received response to register pid request */
382 static const struct nla_policy resp_reg_policy[IWPM_NLA_RREG_PID_MAX] = {
383 [IWPM_NLA_RREG_PID_SEQ] = { .type = NLA_U32 },
384 [IWPM_NLA_RREG_IBDEV_NAME] = { .type = NLA_STRING,
385 .len = IWPM_DEVNAME_SIZE - 1 },
386 [IWPM_NLA_RREG_ULIB_NAME] = { .type = NLA_STRING,
387 .len = IWPM_ULIBNAME_SIZE - 1 },
388 [IWPM_NLA_RREG_ULIB_VER] = { .type = NLA_U16 },
389 [IWPM_NLA_RREG_PID_ERR] = { .type = NLA_U16 }
390 };
391
392 /**
393 * iwpm_register_pid_cb - Process the port mapper response to
394 * iwpm_register_pid query
395 * @skb:
396 * @cb: Contains the received message (payload and netlink header)
397 *
398 * If successful, the function receives the userspace port mapper pid
399 * which is used in future communication with the port mapper
400 */
401 int iwpm_register_pid_cb(struct sk_buff *skb, struct netlink_callback *cb)
402 {
403 struct iwpm_nlmsg_request *nlmsg_request = NULL;
404 struct nlattr *nltb[IWPM_NLA_RREG_PID_MAX];
405 struct iwpm_dev_data *pm_msg;
406 char *dev_name, *iwpm_name;
407 u32 msg_seq;
408 u8 nl_client;
409 u16 iwpm_version;
410 const char *msg_type = "Register Pid response";
411
412 if (iwpm_parse_nlmsg(cb, IWPM_NLA_RREG_PID_MAX,
413 resp_reg_policy, nltb, msg_type))
414 return -EINVAL;
415
416 msg_seq = nla_get_u32(nltb[IWPM_NLA_RREG_PID_SEQ]);
417 nlmsg_request = iwpm_find_nlmsg_request(msg_seq);
418 if (!nlmsg_request) {
419 pr_info("%s: Could not find a matching request (seq = %u)\n",
420 __func__, msg_seq);
421 return -EINVAL;
422 }
423 pm_msg = nlmsg_request->req_buffer;
424 nl_client = nlmsg_request->nl_client;
425 dev_name = (char *)nla_data(nltb[IWPM_NLA_RREG_IBDEV_NAME]);
426 iwpm_name = (char *)nla_data(nltb[IWPM_NLA_RREG_ULIB_NAME]);
427 iwpm_version = nla_get_u16(nltb[IWPM_NLA_RREG_ULIB_VER]);
428
429 /* check device name, ulib name and version */
430 if (strcmp(pm_msg->dev_name, dev_name) ||
431 strcmp(iwpm_ulib_name, iwpm_name) ||
432 iwpm_version < IWPM_UABI_VERSION_MIN) {
433
434 pr_info("%s: Incorrect info (dev = %s name = %s version = %d)\n",
435 __func__, dev_name, iwpm_name, iwpm_version);
436 nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
437 goto register_pid_response_exit;
438 }
439 iwpm_user_pid = cb->nlh->nlmsg_pid;
440 iwpm_ulib_version = iwpm_version;
441 if (iwpm_ulib_version < IWPM_UABI_VERSION)
442 pr_warn_once("%s: Down level iwpmd/pid %u. Continuing...",
443 __func__, iwpm_user_pid);
444 atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
445 pr_debug("%s: iWarp Port Mapper (pid = %d) is available!\n",
446 __func__, iwpm_user_pid);
447 if (iwpm_valid_client(nl_client))
448 iwpm_set_registration(nl_client, IWPM_REG_VALID);
449 register_pid_response_exit:
450 nlmsg_request->request_done = 1;
451 /* always for found nlmsg_request */
452 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
453 barrier();
454 up(&nlmsg_request->sem);
455 return 0;
456 }
457
458 /* netlink attribute policy for the received response to add mapping request */
459 static const struct nla_policy resp_add_policy[IWPM_NLA_RMANAGE_MAPPING_MAX] = {
460 [IWPM_NLA_RMANAGE_MAPPING_SEQ] = { .type = NLA_U32 },
461 [IWPM_NLA_RMANAGE_ADDR] = {
462 .len = sizeof(struct sockaddr_storage) },
463 [IWPM_NLA_RMANAGE_MAPPED_LOC_ADDR] = {
464 .len = sizeof(struct sockaddr_storage) },
465 [IWPM_NLA_RMANAGE_MAPPING_ERR] = { .type = NLA_U16 }
466 };
467
468 /**
469 * iwpm_add_mapping_cb - Process the port mapper response to
470 * iwpm_add_mapping request
471 * @skb:
472 * @cb: Contains the received message (payload and netlink header)
473 */
474 int iwpm_add_mapping_cb(struct sk_buff *skb, struct netlink_callback *cb)
475 {
476 struct iwpm_sa_data *pm_msg;
477 struct iwpm_nlmsg_request *nlmsg_request = NULL;
478 struct nlattr *nltb[IWPM_NLA_RMANAGE_MAPPING_MAX];
479 struct sockaddr_storage *local_sockaddr;
480 struct sockaddr_storage *mapped_sockaddr;
481 const char *msg_type;
482 u32 msg_seq;
483
484 msg_type = "Add Mapping response";
485 if (iwpm_parse_nlmsg(cb, IWPM_NLA_RMANAGE_MAPPING_MAX,
486 resp_add_policy, nltb, msg_type))
487 return -EINVAL;
488
489 atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
490
491 msg_seq = nla_get_u32(nltb[IWPM_NLA_RMANAGE_MAPPING_SEQ]);
492 nlmsg_request = iwpm_find_nlmsg_request(msg_seq);
493 if (!nlmsg_request) {
494 pr_info("%s: Could not find a matching request (seq = %u)\n",
495 __func__, msg_seq);
496 return -EINVAL;
497 }
498 pm_msg = nlmsg_request->req_buffer;
499 local_sockaddr = (struct sockaddr_storage *)
500 nla_data(nltb[IWPM_NLA_RMANAGE_ADDR]);
501 mapped_sockaddr = (struct sockaddr_storage *)
502 nla_data(nltb[IWPM_NLA_RMANAGE_MAPPED_LOC_ADDR]);
503
504 if (iwpm_compare_sockaddr(local_sockaddr, &pm_msg->loc_addr)) {
505 nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
506 goto add_mapping_response_exit;
507 }
508 if (mapped_sockaddr->ss_family != local_sockaddr->ss_family) {
509 pr_info("%s: Sockaddr family doesn't match the requested one\n",
510 __func__);
511 nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
512 goto add_mapping_response_exit;
513 }
514 memcpy(&pm_msg->mapped_loc_addr, mapped_sockaddr,
515 sizeof(*mapped_sockaddr));
516 iwpm_print_sockaddr(&pm_msg->loc_addr,
517 "add_mapping: Local sockaddr:");
518 iwpm_print_sockaddr(&pm_msg->mapped_loc_addr,
519 "add_mapping: Mapped local sockaddr:");
520
521 add_mapping_response_exit:
522 nlmsg_request->request_done = 1;
523 /* always for found request */
524 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
525 barrier();
526 up(&nlmsg_request->sem);
527 return 0;
528 }
529
530 /* netlink attribute policy for the response to add and query mapping request
531 * and response with remote address info */
532 static const struct nla_policy resp_query_policy[IWPM_NLA_RQUERY_MAPPING_MAX] = {
533 [IWPM_NLA_RQUERY_MAPPING_SEQ] = { .type = NLA_U32 },
534 [IWPM_NLA_RQUERY_LOCAL_ADDR] = {
535 .len = sizeof(struct sockaddr_storage) },
536 [IWPM_NLA_RQUERY_REMOTE_ADDR] = {
537 .len = sizeof(struct sockaddr_storage) },
538 [IWPM_NLA_RQUERY_MAPPED_LOC_ADDR] = {
539 .len = sizeof(struct sockaddr_storage) },
540 [IWPM_NLA_RQUERY_MAPPED_REM_ADDR] = {
541 .len = sizeof(struct sockaddr_storage) },
542 [IWPM_NLA_RQUERY_MAPPING_ERR] = { .type = NLA_U16 }
543 };
544
545 /**
546 * iwpm_add_and_query_mapping_cb - Process the port mapper response to
547 * iwpm_add_and_query_mapping request
548 * @skb:
549 * @cb: Contains the received message (payload and netlink header)
550 */
551 int iwpm_add_and_query_mapping_cb(struct sk_buff *skb,
552 struct netlink_callback *cb)
553 {
554 struct iwpm_sa_data *pm_msg;
555 struct iwpm_nlmsg_request *nlmsg_request = NULL;
556 struct nlattr *nltb[IWPM_NLA_RQUERY_MAPPING_MAX];
557 struct sockaddr_storage *local_sockaddr, *remote_sockaddr;
558 struct sockaddr_storage *mapped_loc_sockaddr, *mapped_rem_sockaddr;
559 const char *msg_type;
560 u32 msg_seq;
561 u16 err_code;
562
563 msg_type = "Query Mapping response";
564 if (iwpm_parse_nlmsg(cb, IWPM_NLA_RQUERY_MAPPING_MAX,
565 resp_query_policy, nltb, msg_type))
566 return -EINVAL;
567 atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
568
569 msg_seq = nla_get_u32(nltb[IWPM_NLA_RQUERY_MAPPING_SEQ]);
570 nlmsg_request = iwpm_find_nlmsg_request(msg_seq);
571 if (!nlmsg_request) {
572 pr_info("%s: Could not find a matching request (seq = %u)\n",
573 __func__, msg_seq);
574 return -EINVAL;
575 }
576 pm_msg = nlmsg_request->req_buffer;
577 local_sockaddr = (struct sockaddr_storage *)
578 nla_data(nltb[IWPM_NLA_RQUERY_LOCAL_ADDR]);
579 remote_sockaddr = (struct sockaddr_storage *)
580 nla_data(nltb[IWPM_NLA_RQUERY_REMOTE_ADDR]);
581 mapped_loc_sockaddr = (struct sockaddr_storage *)
582 nla_data(nltb[IWPM_NLA_RQUERY_MAPPED_LOC_ADDR]);
583 mapped_rem_sockaddr = (struct sockaddr_storage *)
584 nla_data(nltb[IWPM_NLA_RQUERY_MAPPED_REM_ADDR]);
585
586 err_code = nla_get_u16(nltb[IWPM_NLA_RQUERY_MAPPING_ERR]);
587 if (err_code == IWPM_REMOTE_QUERY_REJECT) {
588 pr_info("%s: Received a Reject (pid = %u, echo seq = %u)\n",
589 __func__, cb->nlh->nlmsg_pid, msg_seq);
590 nlmsg_request->err_code = IWPM_REMOTE_QUERY_REJECT;
591 }
592 if (iwpm_compare_sockaddr(local_sockaddr, &pm_msg->loc_addr) ||
593 iwpm_compare_sockaddr(remote_sockaddr, &pm_msg->rem_addr)) {
594 pr_info("%s: Incorrect local sockaddr\n", __func__);
595 nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
596 goto query_mapping_response_exit;
597 }
598 if (mapped_loc_sockaddr->ss_family != local_sockaddr->ss_family ||
599 mapped_rem_sockaddr->ss_family != remote_sockaddr->ss_family) {
600 pr_info("%s: Sockaddr family doesn't match the requested one\n",
601 __func__);
602 nlmsg_request->err_code = IWPM_USER_LIB_INFO_ERR;
603 goto query_mapping_response_exit;
604 }
605 memcpy(&pm_msg->mapped_loc_addr, mapped_loc_sockaddr,
606 sizeof(*mapped_loc_sockaddr));
607 memcpy(&pm_msg->mapped_rem_addr, mapped_rem_sockaddr,
608 sizeof(*mapped_rem_sockaddr));
609
610 iwpm_print_sockaddr(&pm_msg->loc_addr,
611 "query_mapping: Local sockaddr:");
612 iwpm_print_sockaddr(&pm_msg->mapped_loc_addr,
613 "query_mapping: Mapped local sockaddr:");
614 iwpm_print_sockaddr(&pm_msg->rem_addr,
615 "query_mapping: Remote sockaddr:");
616 iwpm_print_sockaddr(&pm_msg->mapped_rem_addr,
617 "query_mapping: Mapped remote sockaddr:");
618 query_mapping_response_exit:
619 nlmsg_request->request_done = 1;
620 /* always for found request */
621 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
622 barrier();
623 up(&nlmsg_request->sem);
624 return 0;
625 }
626
627 /**
628 * iwpm_remote_info_cb - Process remote connecting peer address info, which
629 * the port mapper has received from the connecting peer
630 * @skb:
631 * @cb: Contains the received message (payload and netlink header)
632 *
633 * Stores the IPv4/IPv6 address info in a hash table
634 */
635 int iwpm_remote_info_cb(struct sk_buff *skb, struct netlink_callback *cb)
636 {
637 struct nlattr *nltb[IWPM_NLA_RQUERY_MAPPING_MAX];
638 struct sockaddr_storage *local_sockaddr, *remote_sockaddr;
639 struct sockaddr_storage *mapped_loc_sockaddr, *mapped_rem_sockaddr;
640 struct iwpm_remote_info *rem_info;
641 const char *msg_type;
642 u8 nl_client;
643 int ret = -EINVAL;
644
645 msg_type = "Remote Mapping info";
646 if (iwpm_parse_nlmsg(cb, IWPM_NLA_RQUERY_MAPPING_MAX,
647 resp_query_policy, nltb, msg_type))
648 return ret;
649
650 nl_client = RDMA_NL_GET_CLIENT(cb->nlh->nlmsg_type);
651 if (!iwpm_valid_client(nl_client)) {
652 pr_info("%s: Invalid port mapper client = %d\n",
653 __func__, nl_client);
654 return ret;
655 }
656 atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
657
658 local_sockaddr = (struct sockaddr_storage *)
659 nla_data(nltb[IWPM_NLA_RQUERY_LOCAL_ADDR]);
660 remote_sockaddr = (struct sockaddr_storage *)
661 nla_data(nltb[IWPM_NLA_RQUERY_REMOTE_ADDR]);
662 mapped_loc_sockaddr = (struct sockaddr_storage *)
663 nla_data(nltb[IWPM_NLA_RQUERY_MAPPED_LOC_ADDR]);
664 mapped_rem_sockaddr = (struct sockaddr_storage *)
665 nla_data(nltb[IWPM_NLA_RQUERY_MAPPED_REM_ADDR]);
666
667 if (mapped_loc_sockaddr->ss_family != local_sockaddr->ss_family ||
668 mapped_rem_sockaddr->ss_family != remote_sockaddr->ss_family) {
669 pr_info("%s: Sockaddr family doesn't match the requested one\n",
670 __func__);
671 return ret;
672 }
673 rem_info = kzalloc(sizeof(struct iwpm_remote_info), GFP_ATOMIC);
674 if (!rem_info) {
675 ret = -ENOMEM;
676 return ret;
677 }
678 memcpy(&rem_info->mapped_loc_sockaddr, mapped_loc_sockaddr,
679 sizeof(struct sockaddr_storage));
680 memcpy(&rem_info->remote_sockaddr, remote_sockaddr,
681 sizeof(struct sockaddr_storage));
682 memcpy(&rem_info->mapped_rem_sockaddr, mapped_rem_sockaddr,
683 sizeof(struct sockaddr_storage));
684 rem_info->nl_client = nl_client;
685
686 iwpm_add_remote_info(rem_info);
687
688 iwpm_print_sockaddr(local_sockaddr,
689 "remote_info: Local sockaddr:");
690 iwpm_print_sockaddr(mapped_loc_sockaddr,
691 "remote_info: Mapped local sockaddr:");
692 iwpm_print_sockaddr(remote_sockaddr,
693 "remote_info: Remote sockaddr:");
694 iwpm_print_sockaddr(mapped_rem_sockaddr,
695 "remote_info: Mapped remote sockaddr:");
696 return ret;
697 }
698
699 /* netlink attribute policy for the received request for mapping info */
700 static const struct nla_policy resp_mapinfo_policy[IWPM_NLA_MAPINFO_REQ_MAX] = {
701 [IWPM_NLA_MAPINFO_ULIB_NAME] = { .type = NLA_STRING,
702 .len = IWPM_ULIBNAME_SIZE - 1 },
703 [IWPM_NLA_MAPINFO_ULIB_VER] = { .type = NLA_U16 }
704 };
705
706 /**
707 * iwpm_mapping_info_cb - Process a notification that the userspace
708 * port mapper daemon is started
709 * @skb:
710 * @cb: Contains the received message (payload and netlink header)
711 *
712 * Using the received port mapper pid, send all the local mapping
713 * info records to the userspace port mapper
714 */
715 int iwpm_mapping_info_cb(struct sk_buff *skb, struct netlink_callback *cb)
716 {
717 struct nlattr *nltb[IWPM_NLA_MAPINFO_REQ_MAX];
718 const char *msg_type = "Mapping Info response";
719 u8 nl_client;
720 char *iwpm_name;
721 u16 iwpm_version;
722 int ret = -EINVAL;
723
724 if (iwpm_parse_nlmsg(cb, IWPM_NLA_MAPINFO_REQ_MAX,
725 resp_mapinfo_policy, nltb, msg_type)) {
726 pr_info("%s: Unable to parse nlmsg\n", __func__);
727 return ret;
728 }
729 iwpm_name = (char *)nla_data(nltb[IWPM_NLA_MAPINFO_ULIB_NAME]);
730 iwpm_version = nla_get_u16(nltb[IWPM_NLA_MAPINFO_ULIB_VER]);
731 if (strcmp(iwpm_ulib_name, iwpm_name) ||
732 iwpm_version < IWPM_UABI_VERSION_MIN) {
733 pr_info("%s: Invalid port mapper name = %s version = %d\n",
734 __func__, iwpm_name, iwpm_version);
735 return ret;
736 }
737 nl_client = RDMA_NL_GET_CLIENT(cb->nlh->nlmsg_type);
738 if (!iwpm_valid_client(nl_client)) {
739 pr_info("%s: Invalid port mapper client = %d\n",
740 __func__, nl_client);
741 return ret;
742 }
743 iwpm_set_registration(nl_client, IWPM_REG_INCOMPL);
744 atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
745 iwpm_user_pid = cb->nlh->nlmsg_pid;
746
747 if (iwpm_ulib_version < IWPM_UABI_VERSION)
748 pr_warn_once("%s: Down level iwpmd/pid %u. Continuing...",
749 __func__, iwpm_user_pid);
750
751 if (!iwpm_mapinfo_available())
752 return 0;
753 pr_debug("%s: iWarp Port Mapper (pid = %d) is available!\n",
754 __func__, iwpm_user_pid);
755 ret = iwpm_send_mapinfo(nl_client, iwpm_user_pid);
756 return ret;
757 }
758
759 /* netlink attribute policy for the received mapping info ack */
760 static const struct nla_policy ack_mapinfo_policy[IWPM_NLA_MAPINFO_NUM_MAX] = {
761 [IWPM_NLA_MAPINFO_SEQ] = { .type = NLA_U32 },
762 [IWPM_NLA_MAPINFO_SEND_NUM] = { .type = NLA_U32 },
763 [IWPM_NLA_MAPINFO_ACK_NUM] = { .type = NLA_U32 }
764 };
765
766 /**
767 * iwpm_ack_mapping_info_cb - Process the port mapper ack for
768 * the provided local mapping info records
769 * @skb:
770 * @cb: Contains the received message (payload and netlink header)
771 */
772 int iwpm_ack_mapping_info_cb(struct sk_buff *skb, struct netlink_callback *cb)
773 {
774 struct nlattr *nltb[IWPM_NLA_MAPINFO_NUM_MAX];
775 u32 mapinfo_send, mapinfo_ack;
776 const char *msg_type = "Mapping Info Ack";
777
778 if (iwpm_parse_nlmsg(cb, IWPM_NLA_MAPINFO_NUM_MAX,
779 ack_mapinfo_policy, nltb, msg_type))
780 return -EINVAL;
781 mapinfo_send = nla_get_u32(nltb[IWPM_NLA_MAPINFO_SEND_NUM]);
782 mapinfo_ack = nla_get_u32(nltb[IWPM_NLA_MAPINFO_ACK_NUM]);
783 if (mapinfo_ack != mapinfo_send)
784 pr_info("%s: Invalid mapinfo number (sent = %u ack-ed = %u)\n",
785 __func__, mapinfo_send, mapinfo_ack);
786 atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
787 return 0;
788 }
789
790 /* netlink attribute policy for the received port mapper error message */
791 static const struct nla_policy map_error_policy[IWPM_NLA_ERR_MAX] = {
792 [IWPM_NLA_ERR_SEQ] = { .type = NLA_U32 },
793 [IWPM_NLA_ERR_CODE] = { .type = NLA_U16 },
794 };
795
796 /**
797 * iwpm_mapping_error_cb - Process port mapper notification for error
798 *
799 * @skb:
800 * @cb: Contains the received message (payload and netlink header)
801 */
802 int iwpm_mapping_error_cb(struct sk_buff *skb, struct netlink_callback *cb)
803 {
804 struct iwpm_nlmsg_request *nlmsg_request = NULL;
805 int nl_client = RDMA_NL_GET_CLIENT(cb->nlh->nlmsg_type);
806 struct nlattr *nltb[IWPM_NLA_ERR_MAX];
807 u32 msg_seq;
808 u16 err_code;
809 const char *msg_type = "Mapping Error Msg";
810
811 if (iwpm_parse_nlmsg(cb, IWPM_NLA_ERR_MAX,
812 map_error_policy, nltb, msg_type))
813 return -EINVAL;
814
815 msg_seq = nla_get_u32(nltb[IWPM_NLA_ERR_SEQ]);
816 err_code = nla_get_u16(nltb[IWPM_NLA_ERR_CODE]);
817 pr_info("%s: Received msg seq = %u err code = %u client = %d\n",
818 __func__, msg_seq, err_code, nl_client);
819 /* look for nlmsg_request */
820 nlmsg_request = iwpm_find_nlmsg_request(msg_seq);
821 if (!nlmsg_request) {
822 /* not all errors have associated requests */
823 pr_debug("Could not find matching req (seq = %u)\n", msg_seq);
824 return 0;
825 }
826 atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
827 nlmsg_request->err_code = err_code;
828 nlmsg_request->request_done = 1;
829 /* always for found request */
830 kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
831 barrier();
832 up(&nlmsg_request->sem);
833 return 0;
834 }
835
836 /* netlink attribute policy for the received hello request */
837 static const struct nla_policy hello_policy[IWPM_NLA_HELLO_MAX] = {
838 [IWPM_NLA_HELLO_ABI_VERSION] = { .type = NLA_U16 }
839 };
840
841 /**
842 * iwpm_hello_cb - Process a hello message from iwpmd
843 *
844 * @skb:
845 * @cb: Contains the received message (payload and netlink header)
846 *
847 * Using the received port mapper pid, send the kernel's abi_version
848 * after adjusting it to support the iwpmd version.
849 */
850 int iwpm_hello_cb(struct sk_buff *skb, struct netlink_callback *cb)
851 {
852 struct nlattr *nltb[IWPM_NLA_HELLO_MAX];
853 const char *msg_type = "Hello request";
854 u8 nl_client;
855 u16 abi_version;
856 int ret = -EINVAL;
857
858 if (iwpm_parse_nlmsg(cb, IWPM_NLA_HELLO_MAX, hello_policy, nltb,
859 msg_type)) {
860 pr_info("%s: Unable to parse nlmsg\n", __func__);
861 return ret;
862 }
863 abi_version = nla_get_u16(nltb[IWPM_NLA_HELLO_ABI_VERSION]);
864 nl_client = RDMA_NL_GET_CLIENT(cb->nlh->nlmsg_type);
865 if (!iwpm_valid_client(nl_client)) {
866 pr_info("%s: Invalid port mapper client = %d\n",
867 __func__, nl_client);
868 return ret;
869 }
870 iwpm_set_registration(nl_client, IWPM_REG_INCOMPL);
871 atomic_set(&echo_nlmsg_seq, cb->nlh->nlmsg_seq);
872 iwpm_ulib_version = min_t(u16, IWPM_UABI_VERSION, abi_version);
873 pr_debug("Using ABI version %u\n", iwpm_ulib_version);
874 iwpm_user_pid = cb->nlh->nlmsg_pid;
875 ret = iwpm_send_hello(nl_client, iwpm_user_pid, iwpm_ulib_version);
876 return ret;
877 }
Linux with added FPC-III support