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Merge tag 'irqchip-fixes-4.0' of git://git.infradead.org/users/jcooper/linux
[linux-2.6-block.git] / net / tipc / bearer.c
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1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2014, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "bcast.h"
43
44#define MAX_ADDR_STR 60
45
46static struct tipc_media * const media_info_array[] = {
47 &eth_media_info,
48#ifdef CONFIG_TIPC_MEDIA_IB
49 &ib_media_info,
50#endif
51 NULL
52};
53
54static const struct nla_policy
55tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1] = {
56 [TIPC_NLA_BEARER_UNSPEC] = { .type = NLA_UNSPEC },
57 [TIPC_NLA_BEARER_NAME] = {
58 .type = NLA_STRING,
59 .len = TIPC_MAX_BEARER_NAME
60 },
61 [TIPC_NLA_BEARER_PROP] = { .type = NLA_NESTED },
62 [TIPC_NLA_BEARER_DOMAIN] = { .type = NLA_U32 }
63};
64
65static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
66 [TIPC_NLA_MEDIA_UNSPEC] = { .type = NLA_UNSPEC },
67 [TIPC_NLA_MEDIA_NAME] = { .type = NLA_STRING },
68 [TIPC_NLA_MEDIA_PROP] = { .type = NLA_NESTED }
69};
70
71static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
72 bool shutting_down);
73
74/**
75 * tipc_media_find - locates specified media object by name
76 */
77struct tipc_media *tipc_media_find(const char *name)
78{
79 u32 i;
80
81 for (i = 0; media_info_array[i] != NULL; i++) {
82 if (!strcmp(media_info_array[i]->name, name))
83 break;
84 }
85 return media_info_array[i];
86}
87
88/**
89 * media_find_id - locates specified media object by type identifier
90 */
91static struct tipc_media *media_find_id(u8 type)
92{
93 u32 i;
94
95 for (i = 0; media_info_array[i] != NULL; i++) {
96 if (media_info_array[i]->type_id == type)
97 break;
98 }
99 return media_info_array[i];
100}
101
102/**
103 * tipc_media_addr_printf - record media address in print buffer
104 */
105void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
106{
107 char addr_str[MAX_ADDR_STR];
108 struct tipc_media *m_ptr;
109 int ret;
110
111 m_ptr = media_find_id(a->media_id);
112
113 if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
114 ret = scnprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
115 else {
116 u32 i;
117
118 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
119 for (i = 0; i < sizeof(a->value); i++)
120 ret += scnprintf(buf - ret, len + ret,
121 "-%02x", a->value[i]);
122 }
123}
124
125/**
126 * bearer_name_validate - validate & (optionally) deconstruct bearer name
127 * @name: ptr to bearer name string
128 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
129 *
130 * Returns 1 if bearer name is valid, otherwise 0.
131 */
132static int bearer_name_validate(const char *name,
133 struct tipc_bearer_names *name_parts)
134{
135 char name_copy[TIPC_MAX_BEARER_NAME];
136 char *media_name;
137 char *if_name;
138 u32 media_len;
139 u32 if_len;
140
141 /* copy bearer name & ensure length is OK */
142 name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
143 /* need above in case non-Posix strncpy() doesn't pad with nulls */
144 strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
145 if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
146 return 0;
147
148 /* ensure all component parts of bearer name are present */
149 media_name = name_copy;
150 if_name = strchr(media_name, ':');
151 if (if_name == NULL)
152 return 0;
153 *(if_name++) = 0;
154 media_len = if_name - media_name;
155 if_len = strlen(if_name) + 1;
156
157 /* validate component parts of bearer name */
158 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
159 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
160 return 0;
161
162 /* return bearer name components, if necessary */
163 if (name_parts) {
164 strcpy(name_parts->media_name, media_name);
165 strcpy(name_parts->if_name, if_name);
166 }
167 return 1;
168}
169
170/**
171 * tipc_bearer_find - locates bearer object with matching bearer name
172 */
173struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
174{
175 struct tipc_net *tn = net_generic(net, tipc_net_id);
176 struct tipc_bearer *b_ptr;
177 u32 i;
178
179 for (i = 0; i < MAX_BEARERS; i++) {
180 b_ptr = rtnl_dereference(tn->bearer_list[i]);
181 if (b_ptr && (!strcmp(b_ptr->name, name)))
182 return b_ptr;
183 }
184 return NULL;
185}
186
187void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
188{
189 struct tipc_net *tn = net_generic(net, tipc_net_id);
190 struct tipc_bearer *b_ptr;
191
192 rcu_read_lock();
193 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
194 if (b_ptr) {
195 tipc_bcbearer_sort(net, &b_ptr->nodes, dest, true);
196 tipc_disc_add_dest(b_ptr->link_req);
197 }
198 rcu_read_unlock();
199}
200
201void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
202{
203 struct tipc_net *tn = net_generic(net, tipc_net_id);
204 struct tipc_bearer *b_ptr;
205
206 rcu_read_lock();
207 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
208 if (b_ptr) {
209 tipc_bcbearer_sort(net, &b_ptr->nodes, dest, false);
210 tipc_disc_remove_dest(b_ptr->link_req);
211 }
212 rcu_read_unlock();
213}
214
215/**
216 * tipc_enable_bearer - enable bearer with the given name
217 */
218static int tipc_enable_bearer(struct net *net, const char *name,
219 u32 disc_domain, u32 priority)
220{
221 struct tipc_net *tn = net_generic(net, tipc_net_id);
222 struct tipc_bearer *b_ptr;
223 struct tipc_media *m_ptr;
224 struct tipc_bearer_names b_names;
225 char addr_string[16];
226 u32 bearer_id;
227 u32 with_this_prio;
228 u32 i;
229 int res = -EINVAL;
230
231 if (!tn->own_addr) {
232 pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
233 name);
234 return -ENOPROTOOPT;
235 }
236 if (!bearer_name_validate(name, &b_names)) {
237 pr_warn("Bearer <%s> rejected, illegal name\n", name);
238 return -EINVAL;
239 }
240 if (tipc_addr_domain_valid(disc_domain) &&
241 (disc_domain != tn->own_addr)) {
242 if (tipc_in_scope(disc_domain, tn->own_addr)) {
243 disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
244 res = 0; /* accept any node in own cluster */
245 } else if (in_own_cluster_exact(net, disc_domain))
246 res = 0; /* accept specified node in own cluster */
247 }
248 if (res) {
249 pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
250 name);
251 return -EINVAL;
252 }
253 if ((priority > TIPC_MAX_LINK_PRI) &&
254 (priority != TIPC_MEDIA_LINK_PRI)) {
255 pr_warn("Bearer <%s> rejected, illegal priority\n", name);
256 return -EINVAL;
257 }
258
259 m_ptr = tipc_media_find(b_names.media_name);
260 if (!m_ptr) {
261 pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
262 name, b_names.media_name);
263 return -EINVAL;
264 }
265
266 if (priority == TIPC_MEDIA_LINK_PRI)
267 priority = m_ptr->priority;
268
269restart:
270 bearer_id = MAX_BEARERS;
271 with_this_prio = 1;
272 for (i = MAX_BEARERS; i-- != 0; ) {
273 b_ptr = rtnl_dereference(tn->bearer_list[i]);
274 if (!b_ptr) {
275 bearer_id = i;
276 continue;
277 }
278 if (!strcmp(name, b_ptr->name)) {
279 pr_warn("Bearer <%s> rejected, already enabled\n",
280 name);
281 return -EINVAL;
282 }
283 if ((b_ptr->priority == priority) &&
284 (++with_this_prio > 2)) {
285 if (priority-- == 0) {
286 pr_warn("Bearer <%s> rejected, duplicate priority\n",
287 name);
288 return -EINVAL;
289 }
290 pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
291 name, priority + 1, priority);
292 goto restart;
293 }
294 }
295 if (bearer_id >= MAX_BEARERS) {
296 pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
297 name, MAX_BEARERS);
298 return -EINVAL;
299 }
300
301 b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
302 if (!b_ptr)
303 return -ENOMEM;
304
305 strcpy(b_ptr->name, name);
306 b_ptr->media = m_ptr;
307 res = m_ptr->enable_media(net, b_ptr);
308 if (res) {
309 pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
310 name, -res);
311 return -EINVAL;
312 }
313
314 b_ptr->identity = bearer_id;
315 b_ptr->tolerance = m_ptr->tolerance;
316 b_ptr->window = m_ptr->window;
317 b_ptr->domain = disc_domain;
318 b_ptr->net_plane = bearer_id + 'A';
319 b_ptr->priority = priority;
320
321 res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr);
322 if (res) {
323 bearer_disable(net, b_ptr, false);
324 pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
325 name);
326 return -EINVAL;
327 }
328
329 rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr);
330
331 pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
332 name,
333 tipc_addr_string_fill(addr_string, disc_domain), priority);
334 return res;
335}
336
337/**
338 * tipc_reset_bearer - Reset all links established over this bearer
339 */
340static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr)
341{
342 pr_info("Resetting bearer <%s>\n", b_ptr->name);
343 tipc_link_reset_list(net, b_ptr->identity);
344 tipc_disc_reset(net, b_ptr);
345 return 0;
346}
347
348/**
349 * bearer_disable
350 *
351 * Note: This routine assumes caller holds RTNL lock.
352 */
353static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
354 bool shutting_down)
355{
356 struct tipc_net *tn = net_generic(net, tipc_net_id);
357 u32 i;
358
359 pr_info("Disabling bearer <%s>\n", b_ptr->name);
360 b_ptr->media->disable_media(b_ptr);
361
362 tipc_link_delete_list(net, b_ptr->identity, shutting_down);
363 if (b_ptr->link_req)
364 tipc_disc_delete(b_ptr->link_req);
365
366 for (i = 0; i < MAX_BEARERS; i++) {
367 if (b_ptr == rtnl_dereference(tn->bearer_list[i])) {
368 RCU_INIT_POINTER(tn->bearer_list[i], NULL);
369 break;
370 }
371 }
372 kfree_rcu(b_ptr, rcu);
373}
374
375int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b)
376{
377 struct net_device *dev;
378 char *driver_name = strchr((const char *)b->name, ':') + 1;
379
380 /* Find device with specified name */
381 dev = dev_get_by_name(net, driver_name);
382 if (!dev)
383 return -ENODEV;
384
385 /* Associate TIPC bearer with L2 bearer */
386 rcu_assign_pointer(b->media_ptr, dev);
387 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
388 memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
389 b->bcast_addr.media_id = b->media->type_id;
390 b->bcast_addr.broadcast = 1;
391 b->mtu = dev->mtu;
392 b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
393 rcu_assign_pointer(dev->tipc_ptr, b);
394 return 0;
395}
396
397/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
398 *
399 * Mark L2 bearer as inactive so that incoming buffers are thrown away,
400 * then get worker thread to complete bearer cleanup. (Can't do cleanup
401 * here because cleanup code needs to sleep and caller holds spinlocks.)
402 */
403void tipc_disable_l2_media(struct tipc_bearer *b)
404{
405 struct net_device *dev;
406
407 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
408 RCU_INIT_POINTER(b->media_ptr, NULL);
409 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
410 synchronize_net();
411 dev_put(dev);
412}
413
414/**
415 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
416 * @buf: the packet to be sent
417 * @b_ptr: the bearer through which the packet is to be sent
418 * @dest: peer destination address
419 */
420int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
421 struct tipc_bearer *b, struct tipc_media_addr *dest)
422{
423 struct sk_buff *clone;
424 struct net_device *dev;
425 int delta;
426
427 dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
428 if (!dev)
429 return 0;
430
431 clone = skb_clone(buf, GFP_ATOMIC);
432 if (!clone)
433 return 0;
434
435 delta = dev->hard_header_len - skb_headroom(buf);
436 if ((delta > 0) &&
437 pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
438 kfree_skb(clone);
439 return 0;
440 }
441
442 skb_reset_network_header(clone);
443 clone->dev = dev;
444 clone->protocol = htons(ETH_P_TIPC);
445 dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
446 dev->dev_addr, clone->len);
447 dev_queue_xmit(clone);
448 return 0;
449}
450
451/* tipc_bearer_send- sends buffer to destination over bearer
452 *
453 * IMPORTANT:
454 * The media send routine must not alter the buffer being passed in
455 * as it may be needed for later retransmission!
456 */
457void tipc_bearer_send(struct net *net, u32 bearer_id, struct sk_buff *buf,
458 struct tipc_media_addr *dest)
459{
460 struct tipc_net *tn = net_generic(net, tipc_net_id);
461 struct tipc_bearer *b_ptr;
462
463 rcu_read_lock();
464 b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
465 if (likely(b_ptr))
466 b_ptr->media->send_msg(net, buf, b_ptr, dest);
467 rcu_read_unlock();
468}
469
470/**
471 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
472 * @buf: the received packet
473 * @dev: the net device that the packet was received on
474 * @pt: the packet_type structure which was used to register this handler
475 * @orig_dev: the original receive net device in case the device is a bond
476 *
477 * Accept only packets explicitly sent to this node, or broadcast packets;
478 * ignores packets sent using interface multicast, and traffic sent to other
479 * nodes (which can happen if interface is running in promiscuous mode).
480 */
481static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
482 struct packet_type *pt, struct net_device *orig_dev)
483{
484 struct tipc_bearer *b_ptr;
485
486 rcu_read_lock();
487 b_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
488 if (likely(b_ptr)) {
489 if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
490 buf->next = NULL;
491 tipc_rcv(dev_net(dev), buf, b_ptr);
492 rcu_read_unlock();
493 return NET_RX_SUCCESS;
494 }
495 }
496 rcu_read_unlock();
497
498 kfree_skb(buf);
499 return NET_RX_DROP;
500}
501
502/**
503 * tipc_l2_device_event - handle device events from network device
504 * @nb: the context of the notification
505 * @evt: the type of event
506 * @ptr: the net device that the event was on
507 *
508 * This function is called by the Ethernet driver in case of link
509 * change event.
510 */
511static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
512 void *ptr)
513{
514 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
515 struct net *net = dev_net(dev);
516 struct tipc_bearer *b_ptr;
517
518 b_ptr = rtnl_dereference(dev->tipc_ptr);
519 if (!b_ptr)
520 return NOTIFY_DONE;
521
522 b_ptr->mtu = dev->mtu;
523
524 switch (evt) {
525 case NETDEV_CHANGE:
526 if (netif_carrier_ok(dev))
527 break;
528 case NETDEV_DOWN:
529 case NETDEV_CHANGEMTU:
530 tipc_reset_bearer(net, b_ptr);
531 break;
532 case NETDEV_CHANGEADDR:
533 b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
534 (char *)dev->dev_addr);
535 tipc_reset_bearer(net, b_ptr);
536 break;
537 case NETDEV_UNREGISTER:
538 case NETDEV_CHANGENAME:
539 bearer_disable(dev_net(dev), b_ptr, false);
540 break;
541 }
542 return NOTIFY_OK;
543}
544
545static struct packet_type tipc_packet_type __read_mostly = {
546 .type = htons(ETH_P_TIPC),
547 .func = tipc_l2_rcv_msg,
548};
549
550static struct notifier_block notifier = {
551 .notifier_call = tipc_l2_device_event,
552 .priority = 0,
553};
554
555int tipc_bearer_setup(void)
556{
557 int err;
558
559 err = register_netdevice_notifier(&notifier);
560 if (err)
561 return err;
562 dev_add_pack(&tipc_packet_type);
563 return 0;
564}
565
566void tipc_bearer_cleanup(void)
567{
568 unregister_netdevice_notifier(&notifier);
569 dev_remove_pack(&tipc_packet_type);
570}
571
572void tipc_bearer_stop(struct net *net)
573{
574 struct tipc_net *tn = net_generic(net, tipc_net_id);
575 struct tipc_bearer *b_ptr;
576 u32 i;
577
578 for (i = 0; i < MAX_BEARERS; i++) {
579 b_ptr = rtnl_dereference(tn->bearer_list[i]);
580 if (b_ptr) {
581 bearer_disable(net, b_ptr, true);
582 tn->bearer_list[i] = NULL;
583 }
584 }
585}
586
587/* Caller should hold rtnl_lock to protect the bearer */
588static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
589 struct tipc_bearer *bearer)
590{
591 void *hdr;
592 struct nlattr *attrs;
593 struct nlattr *prop;
594
595 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
596 NLM_F_MULTI, TIPC_NL_BEARER_GET);
597 if (!hdr)
598 return -EMSGSIZE;
599
600 attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
601 if (!attrs)
602 goto msg_full;
603
604 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
605 goto attr_msg_full;
606
607 prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
608 if (!prop)
609 goto prop_msg_full;
610 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
611 goto prop_msg_full;
612 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
613 goto prop_msg_full;
614 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
615 goto prop_msg_full;
616
617 nla_nest_end(msg->skb, prop);
618 nla_nest_end(msg->skb, attrs);
619 genlmsg_end(msg->skb, hdr);
620
621 return 0;
622
623prop_msg_full:
624 nla_nest_cancel(msg->skb, prop);
625attr_msg_full:
626 nla_nest_cancel(msg->skb, attrs);
627msg_full:
628 genlmsg_cancel(msg->skb, hdr);
629
630 return -EMSGSIZE;
631}
632
633int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
634{
635 int err;
636 int i = cb->args[0];
637 struct tipc_bearer *bearer;
638 struct tipc_nl_msg msg;
639 struct net *net = sock_net(skb->sk);
640 struct tipc_net *tn = net_generic(net, tipc_net_id);
641
642 if (i == MAX_BEARERS)
643 return 0;
644
645 msg.skb = skb;
646 msg.portid = NETLINK_CB(cb->skb).portid;
647 msg.seq = cb->nlh->nlmsg_seq;
648
649 rtnl_lock();
650 for (i = 0; i < MAX_BEARERS; i++) {
651 bearer = rtnl_dereference(tn->bearer_list[i]);
652 if (!bearer)
653 continue;
654
655 err = __tipc_nl_add_bearer(&msg, bearer);
656 if (err)
657 break;
658 }
659 rtnl_unlock();
660
661 cb->args[0] = i;
662 return skb->len;
663}
664
665int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
666{
667 int err;
668 char *name;
669 struct sk_buff *rep;
670 struct tipc_bearer *bearer;
671 struct tipc_nl_msg msg;
672 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
673 struct net *net = genl_info_net(info);
674
675 if (!info->attrs[TIPC_NLA_BEARER])
676 return -EINVAL;
677
678 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
679 info->attrs[TIPC_NLA_BEARER],
680 tipc_nl_bearer_policy);
681 if (err)
682 return err;
683
684 if (!attrs[TIPC_NLA_BEARER_NAME])
685 return -EINVAL;
686 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
687
688 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
689 if (!rep)
690 return -ENOMEM;
691
692 msg.skb = rep;
693 msg.portid = info->snd_portid;
694 msg.seq = info->snd_seq;
695
696 rtnl_lock();
697 bearer = tipc_bearer_find(net, name);
698 if (!bearer) {
699 err = -EINVAL;
700 goto err_out;
701 }
702
703 err = __tipc_nl_add_bearer(&msg, bearer);
704 if (err)
705 goto err_out;
706 rtnl_unlock();
707
708 return genlmsg_reply(rep, info);
709err_out:
710 rtnl_unlock();
711 nlmsg_free(rep);
712
713 return err;
714}
715
716int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
717{
718 int err;
719 char *name;
720 struct tipc_bearer *bearer;
721 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
722 struct net *net = sock_net(skb->sk);
723
724 if (!info->attrs[TIPC_NLA_BEARER])
725 return -EINVAL;
726
727 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
728 info->attrs[TIPC_NLA_BEARER],
729 tipc_nl_bearer_policy);
730 if (err)
731 return err;
732
733 if (!attrs[TIPC_NLA_BEARER_NAME])
734 return -EINVAL;
735
736 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
737
738 rtnl_lock();
739 bearer = tipc_bearer_find(net, name);
740 if (!bearer) {
741 rtnl_unlock();
742 return -EINVAL;
743 }
744
745 bearer_disable(net, bearer, false);
746 rtnl_unlock();
747
748 return 0;
749}
750
751int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
752{
753 int err;
754 char *bearer;
755 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
756 struct net *net = sock_net(skb->sk);
757 struct tipc_net *tn = net_generic(net, tipc_net_id);
758 u32 domain;
759 u32 prio;
760
761 prio = TIPC_MEDIA_LINK_PRI;
762 domain = tn->own_addr & TIPC_CLUSTER_MASK;
763
764 if (!info->attrs[TIPC_NLA_BEARER])
765 return -EINVAL;
766
767 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
768 info->attrs[TIPC_NLA_BEARER],
769 tipc_nl_bearer_policy);
770 if (err)
771 return err;
772
773 if (!attrs[TIPC_NLA_BEARER_NAME])
774 return -EINVAL;
775
776 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
777
778 if (attrs[TIPC_NLA_BEARER_DOMAIN])
779 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
780
781 if (attrs[TIPC_NLA_BEARER_PROP]) {
782 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
783
784 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
785 props);
786 if (err)
787 return err;
788
789 if (props[TIPC_NLA_PROP_PRIO])
790 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
791 }
792
793 rtnl_lock();
794 err = tipc_enable_bearer(net, bearer, domain, prio);
795 if (err) {
796 rtnl_unlock();
797 return err;
798 }
799 rtnl_unlock();
800
801 return 0;
802}
803
804int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
805{
806 int err;
807 char *name;
808 struct tipc_bearer *b;
809 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
810 struct net *net = genl_info_net(info);
811
812 if (!info->attrs[TIPC_NLA_BEARER])
813 return -EINVAL;
814
815 err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
816 info->attrs[TIPC_NLA_BEARER],
817 tipc_nl_bearer_policy);
818 if (err)
819 return err;
820
821 if (!attrs[TIPC_NLA_BEARER_NAME])
822 return -EINVAL;
823 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
824
825 rtnl_lock();
826 b = tipc_bearer_find(net, name);
827 if (!b) {
828 rtnl_unlock();
829 return -EINVAL;
830 }
831
832 if (attrs[TIPC_NLA_BEARER_PROP]) {
833 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
834
835 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
836 props);
837 if (err) {
838 rtnl_unlock();
839 return err;
840 }
841
842 if (props[TIPC_NLA_PROP_TOL])
843 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
844 if (props[TIPC_NLA_PROP_PRIO])
845 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
846 if (props[TIPC_NLA_PROP_WIN])
847 b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
848 }
849 rtnl_unlock();
850
851 return 0;
852}
853
854static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
855 struct tipc_media *media)
856{
857 void *hdr;
858 struct nlattr *attrs;
859 struct nlattr *prop;
860
861 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
862 NLM_F_MULTI, TIPC_NL_MEDIA_GET);
863 if (!hdr)
864 return -EMSGSIZE;
865
866 attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
867 if (!attrs)
868 goto msg_full;
869
870 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
871 goto attr_msg_full;
872
873 prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
874 if (!prop)
875 goto prop_msg_full;
876 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
877 goto prop_msg_full;
878 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
879 goto prop_msg_full;
880 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
881 goto prop_msg_full;
882
883 nla_nest_end(msg->skb, prop);
884 nla_nest_end(msg->skb, attrs);
885 genlmsg_end(msg->skb, hdr);
886
887 return 0;
888
889prop_msg_full:
890 nla_nest_cancel(msg->skb, prop);
891attr_msg_full:
892 nla_nest_cancel(msg->skb, attrs);
893msg_full:
894 genlmsg_cancel(msg->skb, hdr);
895
896 return -EMSGSIZE;
897}
898
899int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
900{
901 int err;
902 int i = cb->args[0];
903 struct tipc_nl_msg msg;
904
905 if (i == MAX_MEDIA)
906 return 0;
907
908 msg.skb = skb;
909 msg.portid = NETLINK_CB(cb->skb).portid;
910 msg.seq = cb->nlh->nlmsg_seq;
911
912 rtnl_lock();
913 for (; media_info_array[i] != NULL; i++) {
914 err = __tipc_nl_add_media(&msg, media_info_array[i]);
915 if (err)
916 break;
917 }
918 rtnl_unlock();
919
920 cb->args[0] = i;
921 return skb->len;
922}
923
924int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
925{
926 int err;
927 char *name;
928 struct tipc_nl_msg msg;
929 struct tipc_media *media;
930 struct sk_buff *rep;
931 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
932
933 if (!info->attrs[TIPC_NLA_MEDIA])
934 return -EINVAL;
935
936 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
937 info->attrs[TIPC_NLA_MEDIA],
938 tipc_nl_media_policy);
939 if (err)
940 return err;
941
942 if (!attrs[TIPC_NLA_MEDIA_NAME])
943 return -EINVAL;
944 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
945
946 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
947 if (!rep)
948 return -ENOMEM;
949
950 msg.skb = rep;
951 msg.portid = info->snd_portid;
952 msg.seq = info->snd_seq;
953
954 rtnl_lock();
955 media = tipc_media_find(name);
956 if (!media) {
957 err = -EINVAL;
958 goto err_out;
959 }
960
961 err = __tipc_nl_add_media(&msg, media);
962 if (err)
963 goto err_out;
964 rtnl_unlock();
965
966 return genlmsg_reply(rep, info);
967err_out:
968 rtnl_unlock();
969 nlmsg_free(rep);
970
971 return err;
972}
973
974int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
975{
976 int err;
977 char *name;
978 struct tipc_media *m;
979 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
980
981 if (!info->attrs[TIPC_NLA_MEDIA])
982 return -EINVAL;
983
984 err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
985 info->attrs[TIPC_NLA_MEDIA],
986 tipc_nl_media_policy);
987
988 if (!attrs[TIPC_NLA_MEDIA_NAME])
989 return -EINVAL;
990 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
991
992 rtnl_lock();
993 m = tipc_media_find(name);
994 if (!m) {
995 rtnl_unlock();
996 return -EINVAL;
997 }
998
999 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1000 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1001
1002 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1003 props);
1004 if (err) {
1005 rtnl_unlock();
1006 return err;
1007 }
1008
1009 if (props[TIPC_NLA_PROP_TOL])
1010 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1011 if (props[TIPC_NLA_PROP_PRIO])
1012 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1013 if (props[TIPC_NLA_PROP_WIN])
1014 m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1015 }
1016 rtnl_unlock();
1017
1018 return 0;
1019}
Linux 6.x block layer and io_uring tree(s)