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Merge tag 'drm-fixes-for-v4.14-rc1' of git://people.freedesktop.org/~airlied/linux
[mirror_ubuntu-bionic-kernel.git] / net / tipc / netlink_compat.c
1 /*
2 * Copyright (c) 2014, Ericsson AB
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the names of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * Alternatively, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2 as published by the Free
19 * Software Foundation.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include "core.h"
35 #include "bearer.h"
36 #include "link.h"
37 #include "name_table.h"
38 #include "socket.h"
39 #include "node.h"
40 #include "net.h"
41 #include <net/genetlink.h>
42 #include <linux/tipc_config.h>
43
44 /* The legacy API had an artificial message length limit called
45 * ULTRA_STRING_MAX_LEN.
46 */
47 #define ULTRA_STRING_MAX_LEN 32768
48
49 #define TIPC_SKB_MAX TLV_SPACE(ULTRA_STRING_MAX_LEN)
50
51 #define REPLY_TRUNCATED "<truncated>\n"
52
53 struct tipc_nl_compat_msg {
54 u16 cmd;
55 int rep_type;
56 int rep_size;
57 int req_type;
58 struct net *net;
59 struct sk_buff *rep;
60 struct tlv_desc *req;
61 struct sock *dst_sk;
62 };
63
64 struct tipc_nl_compat_cmd_dump {
65 int (*header)(struct tipc_nl_compat_msg *);
66 int (*dumpit)(struct sk_buff *, struct netlink_callback *);
67 int (*format)(struct tipc_nl_compat_msg *msg, struct nlattr **attrs);
68 };
69
70 struct tipc_nl_compat_cmd_doit {
71 int (*doit)(struct sk_buff *skb, struct genl_info *info);
72 int (*transcode)(struct tipc_nl_compat_cmd_doit *cmd,
73 struct sk_buff *skb, struct tipc_nl_compat_msg *msg);
74 };
75
76 static int tipc_skb_tailroom(struct sk_buff *skb)
77 {
78 int tailroom;
79 int limit;
80
81 tailroom = skb_tailroom(skb);
82 limit = TIPC_SKB_MAX - skb->len;
83
84 if (tailroom < limit)
85 return tailroom;
86
87 return limit;
88 }
89
90 static int tipc_add_tlv(struct sk_buff *skb, u16 type, void *data, u16 len)
91 {
92 struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(skb);
93
94 if (tipc_skb_tailroom(skb) < TLV_SPACE(len))
95 return -EMSGSIZE;
96
97 skb_put(skb, TLV_SPACE(len));
98 tlv->tlv_type = htons(type);
99 tlv->tlv_len = htons(TLV_LENGTH(len));
100 if (len && data)
101 memcpy(TLV_DATA(tlv), data, len);
102
103 return 0;
104 }
105
106 static void tipc_tlv_init(struct sk_buff *skb, u16 type)
107 {
108 struct tlv_desc *tlv = (struct tlv_desc *)skb->data;
109
110 TLV_SET_LEN(tlv, 0);
111 TLV_SET_TYPE(tlv, type);
112 skb_put(skb, sizeof(struct tlv_desc));
113 }
114
115 static int tipc_tlv_sprintf(struct sk_buff *skb, const char *fmt, ...)
116 {
117 int n;
118 u16 len;
119 u32 rem;
120 char *buf;
121 struct tlv_desc *tlv;
122 va_list args;
123
124 rem = tipc_skb_tailroom(skb);
125
126 tlv = (struct tlv_desc *)skb->data;
127 len = TLV_GET_LEN(tlv);
128 buf = TLV_DATA(tlv) + len;
129
130 va_start(args, fmt);
131 n = vscnprintf(buf, rem, fmt, args);
132 va_end(args);
133
134 TLV_SET_LEN(tlv, n + len);
135 skb_put(skb, n);
136
137 return n;
138 }
139
140 static struct sk_buff *tipc_tlv_alloc(int size)
141 {
142 int hdr_len;
143 struct sk_buff *buf;
144
145 size = TLV_SPACE(size);
146 hdr_len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
147
148 buf = alloc_skb(hdr_len + size, GFP_KERNEL);
149 if (!buf)
150 return NULL;
151
152 skb_reserve(buf, hdr_len);
153
154 return buf;
155 }
156
157 static struct sk_buff *tipc_get_err_tlv(char *str)
158 {
159 int str_len = strlen(str) + 1;
160 struct sk_buff *buf;
161
162 buf = tipc_tlv_alloc(TLV_SPACE(str_len));
163 if (buf)
164 tipc_add_tlv(buf, TIPC_TLV_ERROR_STRING, str, str_len);
165
166 return buf;
167 }
168
169 static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
170 struct tipc_nl_compat_msg *msg,
171 struct sk_buff *arg)
172 {
173 int len = 0;
174 int err;
175 struct sk_buff *buf;
176 struct nlmsghdr *nlmsg;
177 struct netlink_callback cb;
178
179 memset(&cb, 0, sizeof(cb));
180 cb.nlh = (struct nlmsghdr *)arg->data;
181 cb.skb = arg;
182
183 buf = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
184 if (!buf)
185 return -ENOMEM;
186
187 buf->sk = msg->dst_sk;
188
189 do {
190 int rem;
191
192 len = (*cmd->dumpit)(buf, &cb);
193
194 nlmsg_for_each_msg(nlmsg, nlmsg_hdr(buf), len, rem) {
195 struct nlattr **attrs;
196
197 err = tipc_nlmsg_parse(nlmsg, &attrs);
198 if (err)
199 goto err_out;
200
201 err = (*cmd->format)(msg, attrs);
202 if (err)
203 goto err_out;
204
205 if (tipc_skb_tailroom(msg->rep) <= 1) {
206 err = -EMSGSIZE;
207 goto err_out;
208 }
209 }
210
211 skb_reset_tail_pointer(buf);
212 buf->len = 0;
213
214 } while (len);
215
216 err = 0;
217
218 err_out:
219 kfree_skb(buf);
220
221 if (err == -EMSGSIZE) {
222 /* The legacy API only considered messages filling
223 * "ULTRA_STRING_MAX_LEN" to be truncated.
224 */
225 if ((TIPC_SKB_MAX - msg->rep->len) <= 1) {
226 char *tail = skb_tail_pointer(msg->rep);
227
228 if (*tail != '\0')
229 sprintf(tail - sizeof(REPLY_TRUNCATED) - 1,
230 REPLY_TRUNCATED);
231 }
232
233 return 0;
234 }
235
236 return err;
237 }
238
239 static int tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
240 struct tipc_nl_compat_msg *msg)
241 {
242 int err;
243 struct sk_buff *arg;
244
245 if (msg->req_type && !TLV_CHECK_TYPE(msg->req, msg->req_type))
246 return -EINVAL;
247
248 msg->rep = tipc_tlv_alloc(msg->rep_size);
249 if (!msg->rep)
250 return -ENOMEM;
251
252 if (msg->rep_type)
253 tipc_tlv_init(msg->rep, msg->rep_type);
254
255 if (cmd->header)
256 (*cmd->header)(msg);
257
258 arg = nlmsg_new(0, GFP_KERNEL);
259 if (!arg) {
260 kfree_skb(msg->rep);
261 msg->rep = NULL;
262 return -ENOMEM;
263 }
264
265 err = __tipc_nl_compat_dumpit(cmd, msg, arg);
266 if (err) {
267 kfree_skb(msg->rep);
268 msg->rep = NULL;
269 }
270 kfree_skb(arg);
271
272 return err;
273 }
274
275 static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
276 struct tipc_nl_compat_msg *msg)
277 {
278 int err;
279 struct sk_buff *doit_buf;
280 struct sk_buff *trans_buf;
281 struct nlattr **attrbuf;
282 struct genl_info info;
283
284 trans_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
285 if (!trans_buf)
286 return -ENOMEM;
287
288 err = (*cmd->transcode)(cmd, trans_buf, msg);
289 if (err)
290 goto trans_out;
291
292 attrbuf = kmalloc((tipc_genl_family.maxattr + 1) *
293 sizeof(struct nlattr *), GFP_KERNEL);
294 if (!attrbuf) {
295 err = -ENOMEM;
296 goto trans_out;
297 }
298
299 err = nla_parse(attrbuf, tipc_genl_family.maxattr,
300 (const struct nlattr *)trans_buf->data,
301 trans_buf->len, NULL, NULL);
302 if (err)
303 goto parse_out;
304
305 doit_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
306 if (!doit_buf) {
307 err = -ENOMEM;
308 goto parse_out;
309 }
310
311 doit_buf->sk = msg->dst_sk;
312
313 memset(&info, 0, sizeof(info));
314 info.attrs = attrbuf;
315
316 err = (*cmd->doit)(doit_buf, &info);
317
318 kfree_skb(doit_buf);
319 parse_out:
320 kfree(attrbuf);
321 trans_out:
322 kfree_skb(trans_buf);
323
324 return err;
325 }
326
327 static int tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
328 struct tipc_nl_compat_msg *msg)
329 {
330 int err;
331
332 if (msg->req_type && !TLV_CHECK_TYPE(msg->req, msg->req_type))
333 return -EINVAL;
334
335 err = __tipc_nl_compat_doit(cmd, msg);
336 if (err)
337 return err;
338
339 /* The legacy API considered an empty message a success message */
340 msg->rep = tipc_tlv_alloc(0);
341 if (!msg->rep)
342 return -ENOMEM;
343
344 return 0;
345 }
346
347 static int tipc_nl_compat_bearer_dump(struct tipc_nl_compat_msg *msg,
348 struct nlattr **attrs)
349 {
350 struct nlattr *bearer[TIPC_NLA_BEARER_MAX + 1];
351 int err;
352
353 if (!attrs[TIPC_NLA_BEARER])
354 return -EINVAL;
355
356 err = nla_parse_nested(bearer, TIPC_NLA_BEARER_MAX,
357 attrs[TIPC_NLA_BEARER], NULL, NULL);
358 if (err)
359 return err;
360
361 return tipc_add_tlv(msg->rep, TIPC_TLV_BEARER_NAME,
362 nla_data(bearer[TIPC_NLA_BEARER_NAME]),
363 nla_len(bearer[TIPC_NLA_BEARER_NAME]));
364 }
365
366 static int tipc_nl_compat_bearer_enable(struct tipc_nl_compat_cmd_doit *cmd,
367 struct sk_buff *skb,
368 struct tipc_nl_compat_msg *msg)
369 {
370 struct nlattr *prop;
371 struct nlattr *bearer;
372 struct tipc_bearer_config *b;
373
374 b = (struct tipc_bearer_config *)TLV_DATA(msg->req);
375
376 bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
377 if (!bearer)
378 return -EMSGSIZE;
379
380 if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name))
381 return -EMSGSIZE;
382
383 if (nla_put_u32(skb, TIPC_NLA_BEARER_DOMAIN, ntohl(b->disc_domain)))
384 return -EMSGSIZE;
385
386 if (ntohl(b->priority) <= TIPC_MAX_LINK_PRI) {
387 prop = nla_nest_start(skb, TIPC_NLA_BEARER_PROP);
388 if (!prop)
389 return -EMSGSIZE;
390 if (nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(b->priority)))
391 return -EMSGSIZE;
392 nla_nest_end(skb, prop);
393 }
394 nla_nest_end(skb, bearer);
395
396 return 0;
397 }
398
399 static int tipc_nl_compat_bearer_disable(struct tipc_nl_compat_cmd_doit *cmd,
400 struct sk_buff *skb,
401 struct tipc_nl_compat_msg *msg)
402 {
403 char *name;
404 struct nlattr *bearer;
405
406 name = (char *)TLV_DATA(msg->req);
407
408 bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
409 if (!bearer)
410 return -EMSGSIZE;
411
412 if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name))
413 return -EMSGSIZE;
414
415 nla_nest_end(skb, bearer);
416
417 return 0;
418 }
419
420 static inline u32 perc(u32 count, u32 total)
421 {
422 return (count * 100 + (total / 2)) / total;
423 }
424
425 static void __fill_bc_link_stat(struct tipc_nl_compat_msg *msg,
426 struct nlattr *prop[], struct nlattr *stats[])
427 {
428 tipc_tlv_sprintf(msg->rep, " Window:%u packets\n",
429 nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
430
431 tipc_tlv_sprintf(msg->rep,
432 " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
433 nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
434 nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
435 nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
436 nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
437 nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
438
439 tipc_tlv_sprintf(msg->rep,
440 " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
441 nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
442 nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
443 nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
444 nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
445 nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
446
447 tipc_tlv_sprintf(msg->rep, " RX naks:%u defs:%u dups:%u\n",
448 nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
449 nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
450 nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
451
452 tipc_tlv_sprintf(msg->rep, " TX naks:%u acks:%u dups:%u\n",
453 nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
454 nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
455 nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
456
457 tipc_tlv_sprintf(msg->rep,
458 " Congestion link:%u Send queue max:%u avg:%u",
459 nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
460 nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
461 nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
462 }
463
464 static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
465 struct nlattr **attrs)
466 {
467 char *name;
468 struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
469 struct nlattr *prop[TIPC_NLA_PROP_MAX + 1];
470 struct nlattr *stats[TIPC_NLA_STATS_MAX + 1];
471 int err;
472
473 if (!attrs[TIPC_NLA_LINK])
474 return -EINVAL;
475
476 err = nla_parse_nested(link, TIPC_NLA_LINK_MAX, attrs[TIPC_NLA_LINK],
477 NULL, NULL);
478 if (err)
479 return err;
480
481 if (!link[TIPC_NLA_LINK_PROP])
482 return -EINVAL;
483
484 err = nla_parse_nested(prop, TIPC_NLA_PROP_MAX,
485 link[TIPC_NLA_LINK_PROP], NULL, NULL);
486 if (err)
487 return err;
488
489 if (!link[TIPC_NLA_LINK_STATS])
490 return -EINVAL;
491
492 err = nla_parse_nested(stats, TIPC_NLA_STATS_MAX,
493 link[TIPC_NLA_LINK_STATS], NULL, NULL);
494 if (err)
495 return err;
496
497 name = (char *)TLV_DATA(msg->req);
498 if (strcmp(name, nla_data(link[TIPC_NLA_LINK_NAME])) != 0)
499 return 0;
500
501 tipc_tlv_sprintf(msg->rep, "\nLink <%s>\n",
502 nla_data(link[TIPC_NLA_LINK_NAME]));
503
504 if (link[TIPC_NLA_LINK_BROADCAST]) {
505 __fill_bc_link_stat(msg, prop, stats);
506 return 0;
507 }
508
509 if (link[TIPC_NLA_LINK_ACTIVE])
510 tipc_tlv_sprintf(msg->rep, " ACTIVE");
511 else if (link[TIPC_NLA_LINK_UP])
512 tipc_tlv_sprintf(msg->rep, " STANDBY");
513 else
514 tipc_tlv_sprintf(msg->rep, " DEFUNCT");
515
516 tipc_tlv_sprintf(msg->rep, " MTU:%u Priority:%u",
517 nla_get_u32(link[TIPC_NLA_LINK_MTU]),
518 nla_get_u32(prop[TIPC_NLA_PROP_PRIO]));
519
520 tipc_tlv_sprintf(msg->rep, " Tolerance:%u ms Window:%u packets\n",
521 nla_get_u32(prop[TIPC_NLA_PROP_TOL]),
522 nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
523
524 tipc_tlv_sprintf(msg->rep,
525 " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
526 nla_get_u32(link[TIPC_NLA_LINK_RX]) -
527 nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
528 nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
529 nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
530 nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
531 nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
532
533 tipc_tlv_sprintf(msg->rep,
534 " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
535 nla_get_u32(link[TIPC_NLA_LINK_TX]) -
536 nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
537 nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
538 nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
539 nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
540 nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
541
542 tipc_tlv_sprintf(msg->rep,
543 " TX profile sample:%u packets average:%u octets\n",
544 nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_CNT]),
545 nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_TOT]) /
546 nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT]));
547
548 tipc_tlv_sprintf(msg->rep,
549 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% ",
550 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P0]),
551 nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
552 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P1]),
553 nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
554 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P2]),
555 nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
556 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P3]),
557 nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
558
559 tipc_tlv_sprintf(msg->rep, "-16384:%u%% -32768:%u%% -66000:%u%%\n",
560 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P4]),
561 nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
562 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P5]),
563 nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
564 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P6]),
565 nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
566
567 tipc_tlv_sprintf(msg->rep,
568 " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
569 nla_get_u32(stats[TIPC_NLA_STATS_RX_STATES]),
570 nla_get_u32(stats[TIPC_NLA_STATS_RX_PROBES]),
571 nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
572 nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
573 nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
574
575 tipc_tlv_sprintf(msg->rep,
576 " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
577 nla_get_u32(stats[TIPC_NLA_STATS_TX_STATES]),
578 nla_get_u32(stats[TIPC_NLA_STATS_TX_PROBES]),
579 nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
580 nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
581 nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
582
583 tipc_tlv_sprintf(msg->rep,
584 " Congestion link:%u Send queue max:%u avg:%u",
585 nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
586 nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
587 nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
588
589 return 0;
590 }
591
592 static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
593 struct nlattr **attrs)
594 {
595 struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
596 struct tipc_link_info link_info;
597 int err;
598
599 if (!attrs[TIPC_NLA_LINK])
600 return -EINVAL;
601
602 err = nla_parse_nested(link, TIPC_NLA_LINK_MAX, attrs[TIPC_NLA_LINK],
603 NULL, NULL);
604 if (err)
605 return err;
606
607 link_info.dest = nla_get_flag(link[TIPC_NLA_LINK_DEST]);
608 link_info.up = htonl(nla_get_flag(link[TIPC_NLA_LINK_UP]));
609 nla_strlcpy(link_info.str, link[TIPC_NLA_LINK_NAME],
610 TIPC_MAX_LINK_NAME);
611
612 return tipc_add_tlv(msg->rep, TIPC_TLV_LINK_INFO,
613 &link_info, sizeof(link_info));
614 }
615
616 static int __tipc_add_link_prop(struct sk_buff *skb,
617 struct tipc_nl_compat_msg *msg,
618 struct tipc_link_config *lc)
619 {
620 switch (msg->cmd) {
621 case TIPC_CMD_SET_LINK_PRI:
622 return nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(lc->value));
623 case TIPC_CMD_SET_LINK_TOL:
624 return nla_put_u32(skb, TIPC_NLA_PROP_TOL, ntohl(lc->value));
625 case TIPC_CMD_SET_LINK_WINDOW:
626 return nla_put_u32(skb, TIPC_NLA_PROP_WIN, ntohl(lc->value));
627 }
628
629 return -EINVAL;
630 }
631
632 static int tipc_nl_compat_media_set(struct sk_buff *skb,
633 struct tipc_nl_compat_msg *msg)
634 {
635 struct nlattr *prop;
636 struct nlattr *media;
637 struct tipc_link_config *lc;
638
639 lc = (struct tipc_link_config *)TLV_DATA(msg->req);
640
641 media = nla_nest_start(skb, TIPC_NLA_MEDIA);
642 if (!media)
643 return -EMSGSIZE;
644
645 if (nla_put_string(skb, TIPC_NLA_MEDIA_NAME, lc->name))
646 return -EMSGSIZE;
647
648 prop = nla_nest_start(skb, TIPC_NLA_MEDIA_PROP);
649 if (!prop)
650 return -EMSGSIZE;
651
652 __tipc_add_link_prop(skb, msg, lc);
653 nla_nest_end(skb, prop);
654 nla_nest_end(skb, media);
655
656 return 0;
657 }
658
659 static int tipc_nl_compat_bearer_set(struct sk_buff *skb,
660 struct tipc_nl_compat_msg *msg)
661 {
662 struct nlattr *prop;
663 struct nlattr *bearer;
664 struct tipc_link_config *lc;
665
666 lc = (struct tipc_link_config *)TLV_DATA(msg->req);
667
668 bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
669 if (!bearer)
670 return -EMSGSIZE;
671
672 if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, lc->name))
673 return -EMSGSIZE;
674
675 prop = nla_nest_start(skb, TIPC_NLA_BEARER_PROP);
676 if (!prop)
677 return -EMSGSIZE;
678
679 __tipc_add_link_prop(skb, msg, lc);
680 nla_nest_end(skb, prop);
681 nla_nest_end(skb, bearer);
682
683 return 0;
684 }
685
686 static int __tipc_nl_compat_link_set(struct sk_buff *skb,
687 struct tipc_nl_compat_msg *msg)
688 {
689 struct nlattr *prop;
690 struct nlattr *link;
691 struct tipc_link_config *lc;
692
693 lc = (struct tipc_link_config *)TLV_DATA(msg->req);
694
695 link = nla_nest_start(skb, TIPC_NLA_LINK);
696 if (!link)
697 return -EMSGSIZE;
698
699 if (nla_put_string(skb, TIPC_NLA_LINK_NAME, lc->name))
700 return -EMSGSIZE;
701
702 prop = nla_nest_start(skb, TIPC_NLA_LINK_PROP);
703 if (!prop)
704 return -EMSGSIZE;
705
706 __tipc_add_link_prop(skb, msg, lc);
707 nla_nest_end(skb, prop);
708 nla_nest_end(skb, link);
709
710 return 0;
711 }
712
713 static int tipc_nl_compat_link_set(struct tipc_nl_compat_cmd_doit *cmd,
714 struct sk_buff *skb,
715 struct tipc_nl_compat_msg *msg)
716 {
717 struct tipc_link_config *lc;
718 struct tipc_bearer *bearer;
719 struct tipc_media *media;
720
721 lc = (struct tipc_link_config *)TLV_DATA(msg->req);
722
723 media = tipc_media_find(lc->name);
724 if (media) {
725 cmd->doit = &tipc_nl_media_set;
726 return tipc_nl_compat_media_set(skb, msg);
727 }
728
729 bearer = tipc_bearer_find(msg->net, lc->name);
730 if (bearer) {
731 cmd->doit = &tipc_nl_bearer_set;
732 return tipc_nl_compat_bearer_set(skb, msg);
733 }
734
735 return __tipc_nl_compat_link_set(skb, msg);
736 }
737
738 static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
739 struct sk_buff *skb,
740 struct tipc_nl_compat_msg *msg)
741 {
742 char *name;
743 struct nlattr *link;
744
745 name = (char *)TLV_DATA(msg->req);
746
747 link = nla_nest_start(skb, TIPC_NLA_LINK);
748 if (!link)
749 return -EMSGSIZE;
750
751 if (nla_put_string(skb, TIPC_NLA_LINK_NAME, name))
752 return -EMSGSIZE;
753
754 nla_nest_end(skb, link);
755
756 return 0;
757 }
758
759 static int tipc_nl_compat_name_table_dump_header(struct tipc_nl_compat_msg *msg)
760 {
761 int i;
762 u32 depth;
763 struct tipc_name_table_query *ntq;
764 static const char * const header[] = {
765 "Type ",
766 "Lower Upper ",
767 "Port Identity ",
768 "Publication Scope"
769 };
770
771 ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
772
773 depth = ntohl(ntq->depth);
774
775 if (depth > 4)
776 depth = 4;
777 for (i = 0; i < depth; i++)
778 tipc_tlv_sprintf(msg->rep, header[i]);
779 tipc_tlv_sprintf(msg->rep, "\n");
780
781 return 0;
782 }
783
784 static int tipc_nl_compat_name_table_dump(struct tipc_nl_compat_msg *msg,
785 struct nlattr **attrs)
786 {
787 char port_str[27];
788 struct tipc_name_table_query *ntq;
789 struct nlattr *nt[TIPC_NLA_NAME_TABLE_MAX + 1];
790 struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
791 u32 node, depth, type, lowbound, upbound;
792 static const char * const scope_str[] = {"", " zone", " cluster",
793 " node"};
794 int err;
795
796 if (!attrs[TIPC_NLA_NAME_TABLE])
797 return -EINVAL;
798
799 err = nla_parse_nested(nt, TIPC_NLA_NAME_TABLE_MAX,
800 attrs[TIPC_NLA_NAME_TABLE], NULL, NULL);
801 if (err)
802 return err;
803
804 if (!nt[TIPC_NLA_NAME_TABLE_PUBL])
805 return -EINVAL;
806
807 err = nla_parse_nested(publ, TIPC_NLA_PUBL_MAX,
808 nt[TIPC_NLA_NAME_TABLE_PUBL], NULL, NULL);
809 if (err)
810 return err;
811
812 ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
813
814 depth = ntohl(ntq->depth);
815 type = ntohl(ntq->type);
816 lowbound = ntohl(ntq->lowbound);
817 upbound = ntohl(ntq->upbound);
818
819 if (!(depth & TIPC_NTQ_ALLTYPES) &&
820 (type != nla_get_u32(publ[TIPC_NLA_PUBL_TYPE])))
821 return 0;
822 if (lowbound && (lowbound > nla_get_u32(publ[TIPC_NLA_PUBL_UPPER])))
823 return 0;
824 if (upbound && (upbound < nla_get_u32(publ[TIPC_NLA_PUBL_LOWER])))
825 return 0;
826
827 tipc_tlv_sprintf(msg->rep, "%-10u ",
828 nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]));
829
830 if (depth == 1)
831 goto out;
832
833 tipc_tlv_sprintf(msg->rep, "%-10u %-10u ",
834 nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]),
835 nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]));
836
837 if (depth == 2)
838 goto out;
839
840 node = nla_get_u32(publ[TIPC_NLA_PUBL_NODE]);
841 sprintf(port_str, "<%u.%u.%u:%u>", tipc_zone(node), tipc_cluster(node),
842 tipc_node(node), nla_get_u32(publ[TIPC_NLA_PUBL_REF]));
843 tipc_tlv_sprintf(msg->rep, "%-26s ", port_str);
844
845 if (depth == 3)
846 goto out;
847
848 tipc_tlv_sprintf(msg->rep, "%-10u %s",
849 nla_get_u32(publ[TIPC_NLA_PUBL_KEY]),
850 scope_str[nla_get_u32(publ[TIPC_NLA_PUBL_SCOPE])]);
851 out:
852 tipc_tlv_sprintf(msg->rep, "\n");
853
854 return 0;
855 }
856
857 static int __tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg,
858 struct nlattr **attrs)
859 {
860 u32 type, lower, upper;
861 struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
862 int err;
863
864 if (!attrs[TIPC_NLA_PUBL])
865 return -EINVAL;
866
867 err = nla_parse_nested(publ, TIPC_NLA_PUBL_MAX, attrs[TIPC_NLA_PUBL],
868 NULL, NULL);
869 if (err)
870 return err;
871
872 type = nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]);
873 lower = nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]);
874 upper = nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]);
875
876 if (lower == upper)
877 tipc_tlv_sprintf(msg->rep, " {%u,%u}", type, lower);
878 else
879 tipc_tlv_sprintf(msg->rep, " {%u,%u,%u}", type, lower, upper);
880
881 return 0;
882 }
883
884 static int tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg, u32 sock)
885 {
886 int err;
887 void *hdr;
888 struct nlattr *nest;
889 struct sk_buff *args;
890 struct tipc_nl_compat_cmd_dump dump;
891
892 args = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
893 if (!args)
894 return -ENOMEM;
895
896 hdr = genlmsg_put(args, 0, 0, &tipc_genl_family, NLM_F_MULTI,
897 TIPC_NL_PUBL_GET);
898
899 nest = nla_nest_start(args, TIPC_NLA_SOCK);
900 if (!nest) {
901 kfree_skb(args);
902 return -EMSGSIZE;
903 }
904
905 if (nla_put_u32(args, TIPC_NLA_SOCK_REF, sock)) {
906 kfree_skb(args);
907 return -EMSGSIZE;
908 }
909
910 nla_nest_end(args, nest);
911 genlmsg_end(args, hdr);
912
913 dump.dumpit = tipc_nl_publ_dump;
914 dump.format = __tipc_nl_compat_publ_dump;
915
916 err = __tipc_nl_compat_dumpit(&dump, msg, args);
917
918 kfree_skb(args);
919
920 return err;
921 }
922
923 static int tipc_nl_compat_sk_dump(struct tipc_nl_compat_msg *msg,
924 struct nlattr **attrs)
925 {
926 int err;
927 u32 sock_ref;
928 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
929
930 if (!attrs[TIPC_NLA_SOCK])
931 return -EINVAL;
932
933 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX, attrs[TIPC_NLA_SOCK],
934 NULL, NULL);
935 if (err)
936 return err;
937
938 sock_ref = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
939 tipc_tlv_sprintf(msg->rep, "%u:", sock_ref);
940
941 if (sock[TIPC_NLA_SOCK_CON]) {
942 u32 node;
943 struct nlattr *con[TIPC_NLA_CON_MAX + 1];
944
945 nla_parse_nested(con, TIPC_NLA_CON_MAX,
946 sock[TIPC_NLA_SOCK_CON], NULL, NULL);
947
948 node = nla_get_u32(con[TIPC_NLA_CON_NODE]);
949 tipc_tlv_sprintf(msg->rep, " connected to <%u.%u.%u:%u>",
950 tipc_zone(node),
951 tipc_cluster(node),
952 tipc_node(node),
953 nla_get_u32(con[TIPC_NLA_CON_SOCK]));
954
955 if (con[TIPC_NLA_CON_FLAG])
956 tipc_tlv_sprintf(msg->rep, " via {%u,%u}\n",
957 nla_get_u32(con[TIPC_NLA_CON_TYPE]),
958 nla_get_u32(con[TIPC_NLA_CON_INST]));
959 else
960 tipc_tlv_sprintf(msg->rep, "\n");
961 } else if (sock[TIPC_NLA_SOCK_HAS_PUBL]) {
962 tipc_tlv_sprintf(msg->rep, " bound to");
963
964 err = tipc_nl_compat_publ_dump(msg, sock_ref);
965 if (err)
966 return err;
967 }
968 tipc_tlv_sprintf(msg->rep, "\n");
969
970 return 0;
971 }
972
973 static int tipc_nl_compat_media_dump(struct tipc_nl_compat_msg *msg,
974 struct nlattr **attrs)
975 {
976 struct nlattr *media[TIPC_NLA_MEDIA_MAX + 1];
977 int err;
978
979 if (!attrs[TIPC_NLA_MEDIA])
980 return -EINVAL;
981
982 err = nla_parse_nested(media, TIPC_NLA_MEDIA_MAX,
983 attrs[TIPC_NLA_MEDIA], NULL, NULL);
984 if (err)
985 return err;
986
987 return tipc_add_tlv(msg->rep, TIPC_TLV_MEDIA_NAME,
988 nla_data(media[TIPC_NLA_MEDIA_NAME]),
989 nla_len(media[TIPC_NLA_MEDIA_NAME]));
990 }
991
992 static int tipc_nl_compat_node_dump(struct tipc_nl_compat_msg *msg,
993 struct nlattr **attrs)
994 {
995 struct tipc_node_info node_info;
996 struct nlattr *node[TIPC_NLA_NODE_MAX + 1];
997 int err;
998
999 if (!attrs[TIPC_NLA_NODE])
1000 return -EINVAL;
1001
1002 err = nla_parse_nested(node, TIPC_NLA_NODE_MAX, attrs[TIPC_NLA_NODE],
1003 NULL, NULL);
1004 if (err)
1005 return err;
1006
1007 node_info.addr = htonl(nla_get_u32(node[TIPC_NLA_NODE_ADDR]));
1008 node_info.up = htonl(nla_get_flag(node[TIPC_NLA_NODE_UP]));
1009
1010 return tipc_add_tlv(msg->rep, TIPC_TLV_NODE_INFO, &node_info,
1011 sizeof(node_info));
1012 }
1013
1014 static int tipc_nl_compat_net_set(struct tipc_nl_compat_cmd_doit *cmd,
1015 struct sk_buff *skb,
1016 struct tipc_nl_compat_msg *msg)
1017 {
1018 u32 val;
1019 struct nlattr *net;
1020
1021 val = ntohl(*(__be32 *)TLV_DATA(msg->req));
1022
1023 net = nla_nest_start(skb, TIPC_NLA_NET);
1024 if (!net)
1025 return -EMSGSIZE;
1026
1027 if (msg->cmd == TIPC_CMD_SET_NODE_ADDR) {
1028 if (nla_put_u32(skb, TIPC_NLA_NET_ADDR, val))
1029 return -EMSGSIZE;
1030 } else if (msg->cmd == TIPC_CMD_SET_NETID) {
1031 if (nla_put_u32(skb, TIPC_NLA_NET_ID, val))
1032 return -EMSGSIZE;
1033 }
1034 nla_nest_end(skb, net);
1035
1036 return 0;
1037 }
1038
1039 static int tipc_nl_compat_net_dump(struct tipc_nl_compat_msg *msg,
1040 struct nlattr **attrs)
1041 {
1042 __be32 id;
1043 struct nlattr *net[TIPC_NLA_NET_MAX + 1];
1044 int err;
1045
1046 if (!attrs[TIPC_NLA_NET])
1047 return -EINVAL;
1048
1049 err = nla_parse_nested(net, TIPC_NLA_NET_MAX, attrs[TIPC_NLA_NET],
1050 NULL, NULL);
1051 if (err)
1052 return err;
1053
1054 id = htonl(nla_get_u32(net[TIPC_NLA_NET_ID]));
1055
1056 return tipc_add_tlv(msg->rep, TIPC_TLV_UNSIGNED, &id, sizeof(id));
1057 }
1058
1059 static int tipc_cmd_show_stats_compat(struct tipc_nl_compat_msg *msg)
1060 {
1061 msg->rep = tipc_tlv_alloc(ULTRA_STRING_MAX_LEN);
1062 if (!msg->rep)
1063 return -ENOMEM;
1064
1065 tipc_tlv_init(msg->rep, TIPC_TLV_ULTRA_STRING);
1066 tipc_tlv_sprintf(msg->rep, "TIPC version " TIPC_MOD_VER "\n");
1067
1068 return 0;
1069 }
1070
1071 static int tipc_nl_compat_handle(struct tipc_nl_compat_msg *msg)
1072 {
1073 struct tipc_nl_compat_cmd_dump dump;
1074 struct tipc_nl_compat_cmd_doit doit;
1075
1076 memset(&dump, 0, sizeof(dump));
1077 memset(&doit, 0, sizeof(doit));
1078
1079 switch (msg->cmd) {
1080 case TIPC_CMD_NOOP:
1081 msg->rep = tipc_tlv_alloc(0);
1082 if (!msg->rep)
1083 return -ENOMEM;
1084 return 0;
1085 case TIPC_CMD_GET_BEARER_NAMES:
1086 msg->rep_size = MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME);
1087 dump.dumpit = tipc_nl_bearer_dump;
1088 dump.format = tipc_nl_compat_bearer_dump;
1089 return tipc_nl_compat_dumpit(&dump, msg);
1090 case TIPC_CMD_ENABLE_BEARER:
1091 msg->req_type = TIPC_TLV_BEARER_CONFIG;
1092 doit.doit = tipc_nl_bearer_enable;
1093 doit.transcode = tipc_nl_compat_bearer_enable;
1094 return tipc_nl_compat_doit(&doit, msg);
1095 case TIPC_CMD_DISABLE_BEARER:
1096 msg->req_type = TIPC_TLV_BEARER_NAME;
1097 doit.doit = tipc_nl_bearer_disable;
1098 doit.transcode = tipc_nl_compat_bearer_disable;
1099 return tipc_nl_compat_doit(&doit, msg);
1100 case TIPC_CMD_SHOW_LINK_STATS:
1101 msg->req_type = TIPC_TLV_LINK_NAME;
1102 msg->rep_size = ULTRA_STRING_MAX_LEN;
1103 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1104 dump.dumpit = tipc_nl_node_dump_link;
1105 dump.format = tipc_nl_compat_link_stat_dump;
1106 return tipc_nl_compat_dumpit(&dump, msg);
1107 case TIPC_CMD_GET_LINKS:
1108 msg->req_type = TIPC_TLV_NET_ADDR;
1109 msg->rep_size = ULTRA_STRING_MAX_LEN;
1110 dump.dumpit = tipc_nl_node_dump_link;
1111 dump.format = tipc_nl_compat_link_dump;
1112 return tipc_nl_compat_dumpit(&dump, msg);
1113 case TIPC_CMD_SET_LINK_TOL:
1114 case TIPC_CMD_SET_LINK_PRI:
1115 case TIPC_CMD_SET_LINK_WINDOW:
1116 msg->req_type = TIPC_TLV_LINK_CONFIG;
1117 doit.doit = tipc_nl_node_set_link;
1118 doit.transcode = tipc_nl_compat_link_set;
1119 return tipc_nl_compat_doit(&doit, msg);
1120 case TIPC_CMD_RESET_LINK_STATS:
1121 msg->req_type = TIPC_TLV_LINK_NAME;
1122 doit.doit = tipc_nl_node_reset_link_stats;
1123 doit.transcode = tipc_nl_compat_link_reset_stats;
1124 return tipc_nl_compat_doit(&doit, msg);
1125 case TIPC_CMD_SHOW_NAME_TABLE:
1126 msg->req_type = TIPC_TLV_NAME_TBL_QUERY;
1127 msg->rep_size = ULTRA_STRING_MAX_LEN;
1128 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1129 dump.header = tipc_nl_compat_name_table_dump_header;
1130 dump.dumpit = tipc_nl_name_table_dump;
1131 dump.format = tipc_nl_compat_name_table_dump;
1132 return tipc_nl_compat_dumpit(&dump, msg);
1133 case TIPC_CMD_SHOW_PORTS:
1134 msg->rep_size = ULTRA_STRING_MAX_LEN;
1135 msg->rep_type = TIPC_TLV_ULTRA_STRING;
1136 dump.dumpit = tipc_nl_sk_dump;
1137 dump.format = tipc_nl_compat_sk_dump;
1138 return tipc_nl_compat_dumpit(&dump, msg);
1139 case TIPC_CMD_GET_MEDIA_NAMES:
1140 msg->rep_size = MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME);
1141 dump.dumpit = tipc_nl_media_dump;
1142 dump.format = tipc_nl_compat_media_dump;
1143 return tipc_nl_compat_dumpit(&dump, msg);
1144 case TIPC_CMD_GET_NODES:
1145 msg->rep_size = ULTRA_STRING_MAX_LEN;
1146 dump.dumpit = tipc_nl_node_dump;
1147 dump.format = tipc_nl_compat_node_dump;
1148 return tipc_nl_compat_dumpit(&dump, msg);
1149 case TIPC_CMD_SET_NODE_ADDR:
1150 msg->req_type = TIPC_TLV_NET_ADDR;
1151 doit.doit = tipc_nl_net_set;
1152 doit.transcode = tipc_nl_compat_net_set;
1153 return tipc_nl_compat_doit(&doit, msg);
1154 case TIPC_CMD_SET_NETID:
1155 msg->req_type = TIPC_TLV_UNSIGNED;
1156 doit.doit = tipc_nl_net_set;
1157 doit.transcode = tipc_nl_compat_net_set;
1158 return tipc_nl_compat_doit(&doit, msg);
1159 case TIPC_CMD_GET_NETID:
1160 msg->rep_size = sizeof(u32);
1161 dump.dumpit = tipc_nl_net_dump;
1162 dump.format = tipc_nl_compat_net_dump;
1163 return tipc_nl_compat_dumpit(&dump, msg);
1164 case TIPC_CMD_SHOW_STATS:
1165 return tipc_cmd_show_stats_compat(msg);
1166 }
1167
1168 return -EOPNOTSUPP;
1169 }
1170
1171 static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
1172 {
1173 int err;
1174 int len;
1175 struct tipc_nl_compat_msg msg;
1176 struct nlmsghdr *req_nlh;
1177 struct nlmsghdr *rep_nlh;
1178 struct tipc_genlmsghdr *req_userhdr = info->userhdr;
1179
1180 memset(&msg, 0, sizeof(msg));
1181
1182 req_nlh = (struct nlmsghdr *)skb->data;
1183 msg.req = nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN;
1184 msg.cmd = req_userhdr->cmd;
1185 msg.net = genl_info_net(info);
1186 msg.dst_sk = skb->sk;
1187
1188 if ((msg.cmd & 0xC000) && (!netlink_net_capable(skb, CAP_NET_ADMIN))) {
1189 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_NET_ADMIN);
1190 err = -EACCES;
1191 goto send;
1192 }
1193
1194 len = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
1195 if (len && !TLV_OK(msg.req, len)) {
1196 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1197 err = -EOPNOTSUPP;
1198 goto send;
1199 }
1200
1201 err = tipc_nl_compat_handle(&msg);
1202 if ((err == -EOPNOTSUPP) || (err == -EPERM))
1203 msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
1204 else if (err == -EINVAL)
1205 msg.rep = tipc_get_err_tlv(TIPC_CFG_TLV_ERROR);
1206 send:
1207 if (!msg.rep)
1208 return err;
1209
1210 len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
1211 skb_push(msg.rep, len);
1212 rep_nlh = nlmsg_hdr(msg.rep);
1213 memcpy(rep_nlh, info->nlhdr, len);
1214 rep_nlh->nlmsg_len = msg.rep->len;
1215 genlmsg_unicast(msg.net, msg.rep, NETLINK_CB(skb).portid);
1216
1217 return err;
1218 }
1219
1220 static const struct genl_ops tipc_genl_compat_ops[] = {
1221 {
1222 .cmd = TIPC_GENL_CMD,
1223 .doit = tipc_nl_compat_recv,
1224 },
1225 };
1226
1227 static struct genl_family tipc_genl_compat_family __ro_after_init = {
1228 .name = TIPC_GENL_NAME,
1229 .version = TIPC_GENL_VERSION,
1230 .hdrsize = TIPC_GENL_HDRLEN,
1231 .maxattr = 0,
1232 .netnsok = true,
1233 .module = THIS_MODULE,
1234 .ops = tipc_genl_compat_ops,
1235 .n_ops = ARRAY_SIZE(tipc_genl_compat_ops),
1236 };
1237
1238 int __init tipc_netlink_compat_start(void)
1239 {
1240 int res;
1241
1242 res = genl_register_family(&tipc_genl_compat_family);
1243 if (res) {
1244 pr_err("Failed to register legacy compat interface\n");
1245 return res;
1246 }
1247
1248 return 0;
1249 }
1250
1251 void tipc_netlink_compat_stop(void)
1252 {
1253 genl_unregister_family(&tipc_genl_compat_family);
1254 }
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