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bfb3e5dd RA |
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 "config.h" | |
d0796d1e | 36 | #include "bearer.h" |
bfb3e5dd RA |
37 | #include <net/genetlink.h> |
38 | #include <linux/tipc_config.h> | |
39 | ||
d0796d1e RA |
40 | /* The legacy API had an artificial message length limit called |
41 | * ULTRA_STRING_MAX_LEN. | |
42 | */ | |
43 | #define ULTRA_STRING_MAX_LEN 32768 | |
44 | ||
45 | #define TIPC_SKB_MAX TLV_SPACE(ULTRA_STRING_MAX_LEN) | |
46 | ||
47 | #define REPLY_TRUNCATED "<truncated>\n" | |
48 | ||
49 | struct tipc_nl_compat_msg { | |
50 | u16 cmd; | |
51 | int rep_size; | |
9ab15465 | 52 | int req_type; |
d0796d1e RA |
53 | struct sk_buff *rep; |
54 | struct tlv_desc *req; | |
55 | struct sock *dst_sk; | |
56 | }; | |
57 | ||
58 | struct tipc_nl_compat_cmd_dump { | |
59 | int (*dumpit)(struct sk_buff *, struct netlink_callback *); | |
60 | int (*format)(struct tipc_nl_compat_msg *msg, struct nlattr **attrs); | |
61 | }; | |
62 | ||
9ab15465 RA |
63 | struct tipc_nl_compat_cmd_doit { |
64 | int (*doit)(struct sk_buff *skb, struct genl_info *info); | |
65 | int (*transcode)(struct sk_buff *skb, struct tipc_nl_compat_msg *msg); | |
66 | }; | |
67 | ||
d0796d1e RA |
68 | static int tipc_skb_tailroom(struct sk_buff *skb) |
69 | { | |
70 | int tailroom; | |
71 | int limit; | |
72 | ||
73 | tailroom = skb_tailroom(skb); | |
74 | limit = TIPC_SKB_MAX - skb->len; | |
75 | ||
76 | if (tailroom < limit) | |
77 | return tailroom; | |
78 | ||
79 | return limit; | |
80 | } | |
81 | ||
82 | static int tipc_add_tlv(struct sk_buff *skb, u16 type, void *data, u16 len) | |
83 | { | |
84 | struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(skb); | |
85 | ||
86 | if (tipc_skb_tailroom(skb) < TLV_SPACE(len)) | |
87 | return -EMSGSIZE; | |
88 | ||
89 | skb_put(skb, TLV_SPACE(len)); | |
90 | tlv->tlv_type = htons(type); | |
91 | tlv->tlv_len = htons(TLV_LENGTH(len)); | |
92 | if (len && data) | |
93 | memcpy(TLV_DATA(tlv), data, len); | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | static struct sk_buff *tipc_tlv_alloc(int size) | |
99 | { | |
100 | int hdr_len; | |
101 | struct sk_buff *buf; | |
102 | ||
103 | size = TLV_SPACE(size); | |
104 | hdr_len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN); | |
105 | ||
106 | buf = alloc_skb(hdr_len + size, GFP_KERNEL); | |
107 | if (!buf) | |
108 | return NULL; | |
109 | ||
110 | skb_reserve(buf, hdr_len); | |
111 | ||
112 | return buf; | |
113 | } | |
114 | ||
115 | static struct sk_buff *tipc_get_err_tlv(char *str) | |
116 | { | |
117 | int str_len = strlen(str) + 1; | |
118 | struct sk_buff *buf; | |
119 | ||
120 | buf = tipc_tlv_alloc(TLV_SPACE(str_len)); | |
121 | if (buf) | |
122 | tipc_add_tlv(buf, TIPC_TLV_ERROR_STRING, str, str_len); | |
123 | ||
124 | return buf; | |
125 | } | |
126 | ||
127 | static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd, | |
128 | struct tipc_nl_compat_msg *msg, | |
129 | struct sk_buff *arg) | |
130 | { | |
131 | int len = 0; | |
132 | int err; | |
133 | struct sk_buff *buf; | |
134 | struct nlmsghdr *nlmsg; | |
135 | struct netlink_callback cb; | |
136 | ||
137 | memset(&cb, 0, sizeof(cb)); | |
138 | cb.nlh = (struct nlmsghdr *)arg->data; | |
139 | cb.skb = arg; | |
140 | ||
141 | buf = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
142 | if (!buf) | |
143 | return -ENOMEM; | |
144 | ||
145 | buf->sk = msg->dst_sk; | |
146 | ||
147 | do { | |
148 | int rem; | |
149 | ||
150 | len = (*cmd->dumpit)(buf, &cb); | |
151 | ||
152 | nlmsg_for_each_msg(nlmsg, nlmsg_hdr(buf), len, rem) { | |
153 | struct nlattr **attrs; | |
154 | ||
155 | err = tipc_nlmsg_parse(nlmsg, &attrs); | |
156 | if (err) | |
157 | goto err_out; | |
158 | ||
159 | err = (*cmd->format)(msg, attrs); | |
160 | if (err) | |
161 | goto err_out; | |
162 | ||
163 | if (tipc_skb_tailroom(msg->rep) <= 1) { | |
164 | err = -EMSGSIZE; | |
165 | goto err_out; | |
166 | } | |
167 | } | |
168 | ||
169 | skb_reset_tail_pointer(buf); | |
170 | buf->len = 0; | |
171 | ||
172 | } while (len); | |
173 | ||
174 | err = 0; | |
175 | ||
176 | err_out: | |
177 | kfree_skb(buf); | |
178 | ||
179 | if (err == -EMSGSIZE) { | |
180 | /* The legacy API only considered messages filling | |
181 | * "ULTRA_STRING_MAX_LEN" to be truncated. | |
182 | */ | |
183 | if ((TIPC_SKB_MAX - msg->rep->len) <= 1) { | |
184 | char *tail = skb_tail_pointer(msg->rep); | |
185 | ||
186 | if (*tail != '\0') | |
187 | sprintf(tail - sizeof(REPLY_TRUNCATED) - 1, | |
188 | REPLY_TRUNCATED); | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | return err; | |
195 | } | |
196 | ||
197 | static int tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd, | |
198 | struct tipc_nl_compat_msg *msg) | |
199 | { | |
200 | int err; | |
201 | struct sk_buff *arg; | |
202 | ||
203 | msg->rep = tipc_tlv_alloc(msg->rep_size); | |
204 | if (!msg->rep) | |
205 | return -ENOMEM; | |
206 | ||
207 | arg = nlmsg_new(0, GFP_KERNEL); | |
208 | if (!arg) { | |
209 | kfree_skb(msg->rep); | |
210 | return -ENOMEM; | |
211 | } | |
212 | ||
213 | err = __tipc_nl_compat_dumpit(cmd, msg, arg); | |
214 | if (err) | |
215 | kfree_skb(msg->rep); | |
216 | ||
217 | kfree_skb(arg); | |
218 | ||
219 | return err; | |
220 | } | |
221 | ||
9ab15465 RA |
222 | static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd, |
223 | struct tipc_nl_compat_msg *msg) | |
224 | { | |
225 | int err; | |
226 | struct sk_buff *doit_buf; | |
227 | struct sk_buff *trans_buf; | |
228 | struct nlattr **attrbuf; | |
229 | struct genl_info info; | |
230 | ||
231 | trans_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
232 | if (!trans_buf) | |
233 | return -ENOMEM; | |
234 | ||
235 | err = (*cmd->transcode)(trans_buf, msg); | |
236 | if (err) | |
237 | goto trans_out; | |
238 | ||
239 | attrbuf = kmalloc((tipc_genl_family.maxattr + 1) * | |
240 | sizeof(struct nlattr *), GFP_KERNEL); | |
241 | if (!attrbuf) { | |
242 | err = -ENOMEM; | |
243 | goto trans_out; | |
244 | } | |
245 | ||
246 | err = nla_parse(attrbuf, tipc_genl_family.maxattr, | |
247 | (const struct nlattr *)trans_buf->data, | |
248 | trans_buf->len, NULL); | |
249 | if (err) | |
250 | goto parse_out; | |
251 | ||
252 | doit_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
253 | if (!doit_buf) { | |
254 | err = -ENOMEM; | |
255 | goto parse_out; | |
256 | } | |
257 | ||
258 | doit_buf->sk = msg->dst_sk; | |
259 | ||
260 | memset(&info, 0, sizeof(info)); | |
261 | info.attrs = attrbuf; | |
262 | ||
263 | err = (*cmd->doit)(doit_buf, &info); | |
264 | ||
265 | kfree_skb(doit_buf); | |
266 | parse_out: | |
267 | kfree(attrbuf); | |
268 | trans_out: | |
269 | kfree_skb(trans_buf); | |
270 | ||
271 | return err; | |
272 | } | |
273 | ||
274 | static int tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd, | |
275 | struct tipc_nl_compat_msg *msg) | |
276 | { | |
277 | int err; | |
278 | ||
279 | if (msg->req_type && !TLV_CHECK_TYPE(msg->req, msg->req_type)) | |
280 | return -EINVAL; | |
281 | ||
282 | err = __tipc_nl_compat_doit(cmd, msg); | |
283 | if (err) | |
284 | return err; | |
285 | ||
286 | /* The legacy API considered an empty message a success message */ | |
287 | msg->rep = tipc_tlv_alloc(0); | |
288 | if (!msg->rep) | |
289 | return -ENOMEM; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
d0796d1e RA |
294 | static int tipc_nl_compat_bearer_dump(struct tipc_nl_compat_msg *msg, |
295 | struct nlattr **attrs) | |
296 | { | |
297 | struct nlattr *bearer[TIPC_NLA_BEARER_MAX + 1]; | |
298 | ||
299 | nla_parse_nested(bearer, TIPC_NLA_BEARER_MAX, attrs[TIPC_NLA_BEARER], | |
300 | NULL); | |
301 | ||
302 | return tipc_add_tlv(msg->rep, TIPC_TLV_BEARER_NAME, | |
303 | nla_data(bearer[TIPC_NLA_BEARER_NAME]), | |
304 | nla_len(bearer[TIPC_NLA_BEARER_NAME])); | |
305 | } | |
306 | ||
9ab15465 RA |
307 | static int tipc_nl_compat_bearer_enable(struct sk_buff *skb, |
308 | struct tipc_nl_compat_msg *msg) | |
309 | { | |
310 | struct nlattr *prop; | |
311 | struct nlattr *bearer; | |
312 | struct tipc_bearer_config *b; | |
313 | ||
314 | b = (struct tipc_bearer_config *)TLV_DATA(msg->req); | |
315 | ||
316 | bearer = nla_nest_start(skb, TIPC_NLA_BEARER); | |
317 | if (!bearer) | |
318 | return -EMSGSIZE; | |
319 | ||
320 | if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name)) | |
321 | return -EMSGSIZE; | |
322 | ||
323 | if (nla_put_u32(skb, TIPC_NLA_BEARER_DOMAIN, ntohl(b->disc_domain))) | |
324 | return -EMSGSIZE; | |
325 | ||
326 | if (ntohl(b->priority) <= TIPC_MAX_LINK_PRI) { | |
327 | prop = nla_nest_start(skb, TIPC_NLA_BEARER_PROP); | |
328 | if (!prop) | |
329 | return -EMSGSIZE; | |
330 | if (nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(b->priority))) | |
331 | return -EMSGSIZE; | |
332 | nla_nest_end(skb, prop); | |
333 | } | |
334 | nla_nest_end(skb, bearer); | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | static int tipc_nl_compat_bearer_disable(struct sk_buff *skb, | |
340 | struct tipc_nl_compat_msg *msg) | |
341 | { | |
342 | char *name; | |
343 | struct nlattr *bearer; | |
344 | ||
345 | name = (char *)TLV_DATA(msg->req); | |
346 | ||
347 | bearer = nla_nest_start(skb, TIPC_NLA_BEARER); | |
348 | if (!bearer) | |
349 | return -EMSGSIZE; | |
350 | ||
351 | if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name)) | |
352 | return -EMSGSIZE; | |
353 | ||
354 | nla_nest_end(skb, bearer); | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
d0796d1e RA |
359 | static int tipc_nl_compat_handle(struct tipc_nl_compat_msg *msg) |
360 | { | |
361 | struct tipc_nl_compat_cmd_dump dump; | |
9ab15465 | 362 | struct tipc_nl_compat_cmd_doit doit; |
d0796d1e RA |
363 | |
364 | memset(&dump, 0, sizeof(dump)); | |
9ab15465 | 365 | memset(&doit, 0, sizeof(doit)); |
d0796d1e RA |
366 | |
367 | switch (msg->cmd) { | |
368 | case TIPC_CMD_GET_BEARER_NAMES: | |
369 | msg->rep_size = MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME); | |
370 | dump.dumpit = tipc_nl_bearer_dump; | |
371 | dump.format = tipc_nl_compat_bearer_dump; | |
372 | return tipc_nl_compat_dumpit(&dump, msg); | |
9ab15465 RA |
373 | case TIPC_CMD_ENABLE_BEARER: |
374 | msg->req_type = TIPC_TLV_BEARER_CONFIG; | |
375 | doit.doit = tipc_nl_bearer_enable; | |
376 | doit.transcode = tipc_nl_compat_bearer_enable; | |
377 | return tipc_nl_compat_doit(&doit, msg); | |
378 | case TIPC_CMD_DISABLE_BEARER: | |
379 | msg->req_type = TIPC_TLV_BEARER_NAME; | |
380 | doit.doit = tipc_nl_bearer_disable; | |
381 | doit.transcode = tipc_nl_compat_bearer_disable; | |
382 | return tipc_nl_compat_doit(&doit, msg); | |
d0796d1e RA |
383 | } |
384 | ||
385 | return -EOPNOTSUPP; | |
386 | } | |
387 | ||
388 | static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info) | |
389 | { | |
390 | int err; | |
391 | int len; | |
392 | struct tipc_nl_compat_msg msg; | |
393 | struct nlmsghdr *req_nlh; | |
394 | struct nlmsghdr *rep_nlh; | |
395 | struct tipc_genlmsghdr *req_userhdr = info->userhdr; | |
396 | struct net *net = genl_info_net(info); | |
397 | ||
398 | memset(&msg, 0, sizeof(msg)); | |
399 | ||
400 | req_nlh = (struct nlmsghdr *)skb->data; | |
401 | msg.req = nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN; | |
402 | msg.cmd = req_userhdr->cmd; | |
403 | msg.dst_sk = info->dst_sk; | |
404 | ||
405 | if ((msg.cmd & 0xC000) && (!netlink_net_capable(skb, CAP_NET_ADMIN))) { | |
406 | msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_NET_ADMIN); | |
407 | err = -EACCES; | |
408 | goto send; | |
409 | } | |
410 | ||
411 | len = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN); | |
412 | if (TLV_GET_LEN(msg.req) && !TLV_OK(msg.req, len)) { | |
413 | msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED); | |
414 | err = -EOPNOTSUPP; | |
415 | goto send; | |
416 | } | |
417 | ||
418 | err = tipc_nl_compat_handle(&msg); | |
419 | if (err == -EOPNOTSUPP) | |
420 | msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED); | |
421 | else if (err == -EINVAL) | |
422 | msg.rep = tipc_get_err_tlv(TIPC_CFG_TLV_ERROR); | |
423 | send: | |
424 | if (!msg.rep) | |
425 | return err; | |
426 | ||
427 | len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN); | |
428 | skb_push(msg.rep, len); | |
429 | rep_nlh = nlmsg_hdr(msg.rep); | |
430 | memcpy(rep_nlh, info->nlhdr, len); | |
431 | rep_nlh->nlmsg_len = msg.rep->len; | |
432 | genlmsg_unicast(net, msg.rep, NETLINK_CB(skb).portid); | |
433 | ||
434 | return err; | |
435 | } | |
436 | ||
bfb3e5dd RA |
437 | static int handle_cmd(struct sk_buff *skb, struct genl_info *info) |
438 | { | |
439 | struct net *net = genl_info_net(info); | |
440 | struct sk_buff *rep_buf; | |
441 | struct nlmsghdr *rep_nlh; | |
442 | struct nlmsghdr *req_nlh = info->nlhdr; | |
443 | struct tipc_genlmsghdr *req_userhdr = info->userhdr; | |
444 | int hdr_space = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN); | |
445 | u16 cmd; | |
446 | ||
447 | if ((req_userhdr->cmd & 0xC000) && | |
448 | (!netlink_net_capable(skb, CAP_NET_ADMIN))) | |
449 | cmd = TIPC_CMD_NOT_NET_ADMIN; | |
450 | else | |
451 | cmd = req_userhdr->cmd; | |
452 | ||
453 | rep_buf = tipc_cfg_do_cmd(net, req_userhdr->dest, cmd, | |
454 | nlmsg_data(req_nlh) + GENL_HDRLEN + | |
455 | TIPC_GENL_HDRLEN, | |
456 | nlmsg_attrlen(req_nlh, GENL_HDRLEN + | |
457 | TIPC_GENL_HDRLEN), hdr_space); | |
458 | ||
459 | if (rep_buf) { | |
460 | skb_push(rep_buf, hdr_space); | |
461 | rep_nlh = nlmsg_hdr(rep_buf); | |
462 | memcpy(rep_nlh, req_nlh, hdr_space); | |
463 | rep_nlh->nlmsg_len = rep_buf->len; | |
464 | genlmsg_unicast(net, rep_buf, NETLINK_CB(skb).portid); | |
465 | } | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
d0796d1e RA |
470 | /* Temporary function to keep functionality throughout the patchset |
471 | * without having to mess with the global variables and other trickery | |
472 | * of the old API. | |
473 | */ | |
474 | static int tipc_nl_compat_tmp_wrap(struct sk_buff *skb, struct genl_info *info) | |
475 | { | |
476 | struct tipc_genlmsghdr *req = info->userhdr; | |
477 | ||
478 | switch (req->cmd) { | |
479 | case TIPC_CMD_GET_BEARER_NAMES: | |
9ab15465 RA |
480 | case TIPC_CMD_ENABLE_BEARER: |
481 | case TIPC_CMD_DISABLE_BEARER: | |
d0796d1e RA |
482 | return tipc_nl_compat_recv(skb, info); |
483 | } | |
484 | ||
485 | return handle_cmd(skb, info); | |
486 | } | |
487 | ||
bfb3e5dd RA |
488 | static struct genl_family tipc_genl_compat_family = { |
489 | .id = GENL_ID_GENERATE, | |
490 | .name = TIPC_GENL_NAME, | |
491 | .version = TIPC_GENL_VERSION, | |
492 | .hdrsize = TIPC_GENL_HDRLEN, | |
493 | .maxattr = 0, | |
494 | .netnsok = true, | |
495 | }; | |
496 | ||
497 | static struct genl_ops tipc_genl_compat_ops[] = { | |
498 | { | |
499 | .cmd = TIPC_GENL_CMD, | |
d0796d1e | 500 | .doit = tipc_nl_compat_tmp_wrap, |
bfb3e5dd RA |
501 | }, |
502 | }; | |
503 | ||
504 | int tipc_netlink_compat_start(void) | |
505 | { | |
506 | int res; | |
507 | ||
508 | res = genl_register_family_with_ops(&tipc_genl_compat_family, | |
509 | tipc_genl_compat_ops); | |
510 | if (res) { | |
511 | pr_err("Failed to register legacy compat interface\n"); | |
512 | return res; | |
513 | } | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | void tipc_netlink_compat_stop(void) | |
519 | { | |
520 | genl_unregister_family(&tipc_genl_compat_family); | |
521 | } |