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1/*
2 * net/tipc/bcast.c: TIPC broadcast code
3 *
4 * Copyright (c) 2004-2006, 2014-2017, Ericsson AB
5 * Copyright (c) 2004, Intel Corporation.
6 * Copyright (c) 2005, 2010-2011, Wind River Systems
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/tipc_config.h>
39#include "socket.h"
40#include "msg.h"
41#include "bcast.h"
42#include "link.h"
43#include "name_table.h"
44
45#define BCLINK_WIN_DEFAULT 50 /* bcast link window size (default) */
46#define BCLINK_WIN_MIN 32 /* bcast minimum link window size */
47
48const char tipc_bclink_name[] = "broadcast-link";
49unsigned long sysctl_tipc_bc_retruni __read_mostly;
50
51/**
52 * struct tipc_bc_base - base structure for keeping broadcast send state
53 * @link: broadcast send link structure
54 * @inputq: data input queue; will only carry SOCK_WAKEUP messages
55 * @dests: array keeping number of reachable destinations per bearer
56 * @primary_bearer: a bearer having links to all broadcast destinations, if any
57 * @bcast_support: indicates if primary bearer, if any, supports broadcast
58 * @force_bcast: forces broadcast for multicast traffic
59 * @rcast_support: indicates if all peer nodes support replicast
60 * @force_rcast: forces replicast for multicast traffic
61 * @rc_ratio: dest count as percentage of cluster size where send method changes
62 * @bc_threshold: calculated from rc_ratio; if dests > threshold use broadcast
63 */
64struct tipc_bc_base {
65 struct tipc_link *link;
66 struct sk_buff_head inputq;
67 int dests[MAX_BEARERS];
68 int primary_bearer;
69 bool bcast_support;
70 bool force_bcast;
71 bool rcast_support;
72 bool force_rcast;
73 int rc_ratio;
74 int bc_threshold;
75};
76
77static struct tipc_bc_base *tipc_bc_base(struct net *net)
78{
79 return tipc_net(net)->bcbase;
80}
81
82/* tipc_bcast_get_mtu(): -get the MTU currently used by broadcast link
83 * Note: the MTU is decremented to give room for a tunnel header, in
84 * case the message needs to be sent as replicast
85 */
86int tipc_bcast_get_mtu(struct net *net)
87{
88 return tipc_link_mss(tipc_bc_sndlink(net));
89}
90
91void tipc_bcast_toggle_rcast(struct net *net, bool supp)
92{
93 tipc_bc_base(net)->rcast_support = supp;
94}
95
96static void tipc_bcbase_calc_bc_threshold(struct net *net)
97{
98 struct tipc_bc_base *bb = tipc_bc_base(net);
99 int cluster_size = tipc_link_bc_peers(tipc_bc_sndlink(net));
100
101 bb->bc_threshold = 1 + (cluster_size * bb->rc_ratio / 100);
102}
103
104/* tipc_bcbase_select_primary(): find a bearer with links to all destinations,
105 * if any, and make it primary bearer
106 */
107static void tipc_bcbase_select_primary(struct net *net)
108{
109 struct tipc_bc_base *bb = tipc_bc_base(net);
110 int all_dests = tipc_link_bc_peers(bb->link);
111 int max_win = tipc_link_max_win(bb->link);
112 int min_win = tipc_link_min_win(bb->link);
113 int i, mtu, prim;
114
115 bb->primary_bearer = INVALID_BEARER_ID;
116 bb->bcast_support = true;
117
118 if (!all_dests)
119 return;
120
121 for (i = 0; i < MAX_BEARERS; i++) {
122 if (!bb->dests[i])
123 continue;
124
125 mtu = tipc_bearer_mtu(net, i);
126 if (mtu < tipc_link_mtu(bb->link)) {
127 tipc_link_set_mtu(bb->link, mtu);
128 tipc_link_set_queue_limits(bb->link,
129 min_win,
130 max_win);
131 }
132 bb->bcast_support &= tipc_bearer_bcast_support(net, i);
133 if (bb->dests[i] < all_dests)
134 continue;
135
136 bb->primary_bearer = i;
137
138 /* Reduce risk that all nodes select same primary */
139 if ((i ^ tipc_own_addr(net)) & 1)
140 break;
141 }
142 prim = bb->primary_bearer;
143 if (prim != INVALID_BEARER_ID)
144 bb->bcast_support = tipc_bearer_bcast_support(net, prim);
145}
146
147void tipc_bcast_inc_bearer_dst_cnt(struct net *net, int bearer_id)
148{
149 struct tipc_bc_base *bb = tipc_bc_base(net);
150
151 tipc_bcast_lock(net);
152 bb->dests[bearer_id]++;
153 tipc_bcbase_select_primary(net);
154 tipc_bcast_unlock(net);
155}
156
157void tipc_bcast_dec_bearer_dst_cnt(struct net *net, int bearer_id)
158{
159 struct tipc_bc_base *bb = tipc_bc_base(net);
160
161 tipc_bcast_lock(net);
162 bb->dests[bearer_id]--;
163 tipc_bcbase_select_primary(net);
164 tipc_bcast_unlock(net);
165}
166
167/* tipc_bcbase_xmit - broadcast a packet queue across one or more bearers
168 *
169 * Note that number of reachable destinations, as indicated in the dests[]
170 * array, may transitionally differ from the number of destinations indicated
171 * in each sent buffer. We can sustain this. Excess destination nodes will
172 * drop and never acknowledge the unexpected packets, and missing destinations
173 * will either require retransmission (if they are just about to be added to
174 * the bearer), or be removed from the buffer's 'ackers' counter (if they
175 * just went down)
176 */
177static void tipc_bcbase_xmit(struct net *net, struct sk_buff_head *xmitq)
178{
179 int bearer_id;
180 struct tipc_bc_base *bb = tipc_bc_base(net);
181 struct sk_buff *skb, *_skb;
182 struct sk_buff_head _xmitq;
183
184 if (skb_queue_empty(xmitq))
185 return;
186
187 /* The typical case: at least one bearer has links to all nodes */
188 bearer_id = bb->primary_bearer;
189 if (bearer_id >= 0) {
190 tipc_bearer_bc_xmit(net, bearer_id, xmitq);
191 return;
192 }
193
194 /* We have to transmit across all bearers */
195 __skb_queue_head_init(&_xmitq);
196 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
197 if (!bb->dests[bearer_id])
198 continue;
199
200 skb_queue_walk(xmitq, skb) {
201 _skb = pskb_copy_for_clone(skb, GFP_ATOMIC);
202 if (!_skb)
203 break;
204 __skb_queue_tail(&_xmitq, _skb);
205 }
206 tipc_bearer_bc_xmit(net, bearer_id, &_xmitq);
207 }
208 __skb_queue_purge(xmitq);
209 __skb_queue_purge(&_xmitq);
210}
211
212static void tipc_bcast_select_xmit_method(struct net *net, int dests,
213 struct tipc_mc_method *method)
214{
215 struct tipc_bc_base *bb = tipc_bc_base(net);
216 unsigned long exp = method->expires;
217
218 /* Broadcast supported by used bearer/bearers? */
219 if (!bb->bcast_support) {
220 method->rcast = true;
221 return;
222 }
223 /* Any destinations which don't support replicast ? */
224 if (!bb->rcast_support) {
225 method->rcast = false;
226 return;
227 }
228 /* Can current method be changed ? */
229 method->expires = jiffies + TIPC_METHOD_EXPIRE;
230 if (method->mandatory)
231 return;
232
233 if (!(tipc_net(net)->capabilities & TIPC_MCAST_RBCTL) &&
234 time_before(jiffies, exp))
235 return;
236
237 /* Configuration as force 'broadcast' method */
238 if (bb->force_bcast) {
239 method->rcast = false;
240 return;
241 }
242 /* Configuration as force 'replicast' method */
243 if (bb->force_rcast) {
244 method->rcast = true;
245 return;
246 }
247 /* Configuration as 'autoselect' or default method */
248 /* Determine method to use now */
249 method->rcast = dests <= bb->bc_threshold;
250}
251
252/* tipc_bcast_xmit - broadcast the buffer chain to all external nodes
253 * @net: the applicable net namespace
254 * @pkts: chain of buffers containing message
255 * @cong_link_cnt: set to 1 if broadcast link is congested, otherwise 0
256 * Consumes the buffer chain.
257 * Returns 0 if success, otherwise errno: -EHOSTUNREACH,-EMSGSIZE
258 */
259int tipc_bcast_xmit(struct net *net, struct sk_buff_head *pkts,
260 u16 *cong_link_cnt)
261{
262 struct tipc_link *l = tipc_bc_sndlink(net);
263 struct sk_buff_head xmitq;
264 int rc = 0;
265
266 __skb_queue_head_init(&xmitq);
267 tipc_bcast_lock(net);
268 if (tipc_link_bc_peers(l))
269 rc = tipc_link_xmit(l, pkts, &xmitq);
270 tipc_bcast_unlock(net);
271 tipc_bcbase_xmit(net, &xmitq);
272 __skb_queue_purge(pkts);
273 if (rc == -ELINKCONG) {
274 *cong_link_cnt = 1;
275 rc = 0;
276 }
277 return rc;
278}
279
280/* tipc_rcast_xmit - replicate and send a message to given destination nodes
281 * @net: the applicable net namespace
282 * @pkts: chain of buffers containing message
283 * @dests: list of destination nodes
284 * @cong_link_cnt: returns number of congested links
285 * @cong_links: returns identities of congested links
286 * Returns 0 if success, otherwise errno
287 */
288static int tipc_rcast_xmit(struct net *net, struct sk_buff_head *pkts,
289 struct tipc_nlist *dests, u16 *cong_link_cnt)
290{
291 struct tipc_dest *dst, *tmp;
292 struct sk_buff_head _pkts;
293 u32 dnode, selector;
294
295 selector = msg_link_selector(buf_msg(skb_peek(pkts)));
296 __skb_queue_head_init(&_pkts);
297
298 list_for_each_entry_safe(dst, tmp, &dests->list, list) {
299 dnode = dst->node;
300 if (!tipc_msg_pskb_copy(dnode, pkts, &_pkts))
301 return -ENOMEM;
302
303 /* Any other return value than -ELINKCONG is ignored */
304 if (tipc_node_xmit(net, &_pkts, dnode, selector) == -ELINKCONG)
305 (*cong_link_cnt)++;
306 }
307 return 0;
308}
309
310/* tipc_mcast_send_sync - deliver a dummy message with SYN bit
311 * @net: the applicable net namespace
312 * @skb: socket buffer to copy
313 * @method: send method to be used
314 * @dests: destination nodes for message.
315 * Returns 0 if success, otherwise errno
316 */
317static int tipc_mcast_send_sync(struct net *net, struct sk_buff *skb,
318 struct tipc_mc_method *method,
319 struct tipc_nlist *dests)
320{
321 struct tipc_msg *hdr, *_hdr;
322 struct sk_buff_head tmpq;
323 u16 cong_link_cnt = 0;
324 struct sk_buff *_skb;
325 int rc = 0;
326
327 /* Is a cluster supporting with new capabilities ? */
328 if (!(tipc_net(net)->capabilities & TIPC_MCAST_RBCTL))
329 return 0;
330
331 hdr = buf_msg(skb);
332 if (msg_user(hdr) == MSG_FRAGMENTER)
333 hdr = msg_inner_hdr(hdr);
334 if (msg_type(hdr) != TIPC_MCAST_MSG)
335 return 0;
336
337 /* Allocate dummy message */
338 _skb = tipc_buf_acquire(MCAST_H_SIZE, GFP_KERNEL);
339 if (!_skb)
340 return -ENOMEM;
341
342 /* Preparing for 'synching' header */
343 msg_set_syn(hdr, 1);
344
345 /* Copy skb's header into a dummy header */
346 skb_copy_to_linear_data(_skb, hdr, MCAST_H_SIZE);
347 skb_orphan(_skb);
348
349 /* Reverse method for dummy message */
350 _hdr = buf_msg(_skb);
351 msg_set_size(_hdr, MCAST_H_SIZE);
352 msg_set_is_rcast(_hdr, !msg_is_rcast(hdr));
353 msg_set_errcode(_hdr, TIPC_ERR_NO_PORT);
354
355 __skb_queue_head_init(&tmpq);
356 __skb_queue_tail(&tmpq, _skb);
357 if (method->rcast)
358 rc = tipc_bcast_xmit(net, &tmpq, &cong_link_cnt);
359 else
360 rc = tipc_rcast_xmit(net, &tmpq, dests, &cong_link_cnt);
361
362 /* This queue should normally be empty by now */
363 __skb_queue_purge(&tmpq);
364
365 return rc;
366}
367
368/* tipc_mcast_xmit - deliver message to indicated destination nodes
369 * and to identified node local sockets
370 * @net: the applicable net namespace
371 * @pkts: chain of buffers containing message
372 * @method: send method to be used
373 * @dests: destination nodes for message.
374 * @cong_link_cnt: returns number of encountered congested destination links
375 * Consumes buffer chain.
376 * Returns 0 if success, otherwise errno
377 */
378int tipc_mcast_xmit(struct net *net, struct sk_buff_head *pkts,
379 struct tipc_mc_method *method, struct tipc_nlist *dests,
380 u16 *cong_link_cnt)
381{
382 struct sk_buff_head inputq, localq;
383 bool rcast = method->rcast;
384 struct tipc_msg *hdr;
385 struct sk_buff *skb;
386 int rc = 0;
387
388 skb_queue_head_init(&inputq);
389 __skb_queue_head_init(&localq);
390
391 /* Clone packets before they are consumed by next call */
392 if (dests->local && !tipc_msg_reassemble(pkts, &localq)) {
393 rc = -ENOMEM;
394 goto exit;
395 }
396 /* Send according to determined transmit method */
397 if (dests->remote) {
398 tipc_bcast_select_xmit_method(net, dests->remote, method);
399
400 skb = skb_peek(pkts);
401 hdr = buf_msg(skb);
402 if (msg_user(hdr) == MSG_FRAGMENTER)
403 hdr = msg_inner_hdr(hdr);
404 msg_set_is_rcast(hdr, method->rcast);
405
406 /* Switch method ? */
407 if (rcast != method->rcast) {
408 rc = tipc_mcast_send_sync(net, skb, method, dests);
409 if (unlikely(rc)) {
410 pr_err("Unable to send SYN: method %d, rc %d\n",
411 rcast, rc);
412 goto exit;
413 }
414 }
415
416 if (method->rcast)
417 rc = tipc_rcast_xmit(net, pkts, dests, cong_link_cnt);
418 else
419 rc = tipc_bcast_xmit(net, pkts, cong_link_cnt);
420 }
421
422 if (dests->local) {
423 tipc_loopback_trace(net, &localq);
424 tipc_sk_mcast_rcv(net, &localq, &inputq);
425 }
426exit:
427 /* This queue should normally be empty by now */
428 __skb_queue_purge(pkts);
429 return rc;
430}
431
432/* tipc_bcast_rcv - receive a broadcast packet, and deliver to rcv link
433 *
434 * RCU is locked, no other locks set
435 */
436int tipc_bcast_rcv(struct net *net, struct tipc_link *l, struct sk_buff *skb)
437{
438 struct tipc_msg *hdr = buf_msg(skb);
439 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
440 struct sk_buff_head xmitq;
441 int rc;
442
443 __skb_queue_head_init(&xmitq);
444
445 if (msg_mc_netid(hdr) != tipc_netid(net) || !tipc_link_is_up(l)) {
446 kfree_skb(skb);
447 return 0;
448 }
449
450 tipc_bcast_lock(net);
451 if (msg_user(hdr) == BCAST_PROTOCOL)
452 rc = tipc_link_bc_nack_rcv(l, skb, &xmitq);
453 else
454 rc = tipc_link_rcv(l, skb, NULL);
455 tipc_bcast_unlock(net);
456
457 tipc_bcbase_xmit(net, &xmitq);
458
459 /* Any socket wakeup messages ? */
460 if (!skb_queue_empty(inputq))
461 tipc_sk_rcv(net, inputq);
462
463 return rc;
464}
465
466/* tipc_bcast_ack_rcv - receive and handle a broadcast acknowledge
467 *
468 * RCU is locked, no other locks set
469 */
470void tipc_bcast_ack_rcv(struct net *net, struct tipc_link *l,
471 struct tipc_msg *hdr)
472{
473 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
474 u16 acked = msg_bcast_ack(hdr);
475 struct sk_buff_head xmitq;
476
477 /* Ignore bc acks sent by peer before bcast synch point was received */
478 if (msg_bc_ack_invalid(hdr))
479 return;
480
481 __skb_queue_head_init(&xmitq);
482
483 tipc_bcast_lock(net);
484 tipc_link_bc_ack_rcv(l, acked, 0, NULL, &xmitq, NULL);
485 tipc_bcast_unlock(net);
486
487 tipc_bcbase_xmit(net, &xmitq);
488
489 /* Any socket wakeup messages ? */
490 if (!skb_queue_empty(inputq))
491 tipc_sk_rcv(net, inputq);
492}
493
494/* tipc_bcast_synch_rcv - check and update rcv link with peer's send state
495 *
496 * RCU is locked, no other locks set
497 */
498int tipc_bcast_sync_rcv(struct net *net, struct tipc_link *l,
499 struct tipc_msg *hdr,
500 struct sk_buff_head *retrq, bool *valid)
501{
502 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
503 struct tipc_gap_ack_blks *ga;
504 struct sk_buff_head xmitq;
505 int rc = 0;
506 u16 glen;
507
508 __skb_queue_head_init(&xmitq);
509
510 tipc_bcast_lock(net);
511 if (msg_type(hdr) != STATE_MSG) {
512 tipc_link_bc_init_rcv(l, hdr);
513 } else if (!msg_bc_ack_invalid(hdr)) {
514 glen = tipc_get_gap_ack_blks(&ga, l, hdr, false);
515 if (glen > msg_data_sz(hdr)) {
516 /* Malformed Gap ACK blocks; caller drops the msg */
517 *valid = false;
518 } else {
519 if (!sysctl_tipc_bc_retruni)
520 retrq = &xmitq;
521 rc = tipc_link_bc_ack_rcv(l, msg_bcast_ack(hdr),
522 msg_bc_gap(hdr), ga, &xmitq,
523 retrq);
524 rc |= tipc_link_bc_sync_rcv(l, hdr, &xmitq);
525 }
526 }
527 tipc_bcast_unlock(net);
528
529 tipc_bcbase_xmit(net, &xmitq);
530
531 /* Any socket wakeup messages ? */
532 if (!skb_queue_empty(inputq))
533 tipc_sk_rcv(net, inputq);
534 return rc;
535}
536
537/* tipc_bcast_add_peer - add a peer node to broadcast link and bearer
538 *
539 * RCU is locked, node lock is set
540 */
541void tipc_bcast_add_peer(struct net *net, struct tipc_link *uc_l,
542 struct sk_buff_head *xmitq)
543{
544 struct tipc_link *snd_l = tipc_bc_sndlink(net);
545
546 tipc_bcast_lock(net);
547 tipc_link_add_bc_peer(snd_l, uc_l, xmitq);
548 tipc_bcbase_select_primary(net);
549 tipc_bcbase_calc_bc_threshold(net);
550 tipc_bcast_unlock(net);
551}
552
553/* tipc_bcast_remove_peer - remove a peer node from broadcast link and bearer
554 *
555 * RCU is locked, node lock is set
556 */
557void tipc_bcast_remove_peer(struct net *net, struct tipc_link *rcv_l)
558{
559 struct tipc_link *snd_l = tipc_bc_sndlink(net);
560 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
561 struct sk_buff_head xmitq;
562
563 __skb_queue_head_init(&xmitq);
564
565 tipc_bcast_lock(net);
566 tipc_link_remove_bc_peer(snd_l, rcv_l, &xmitq);
567 tipc_bcbase_select_primary(net);
568 tipc_bcbase_calc_bc_threshold(net);
569 tipc_bcast_unlock(net);
570
571 tipc_bcbase_xmit(net, &xmitq);
572
573 /* Any socket wakeup messages ? */
574 if (!skb_queue_empty(inputq))
575 tipc_sk_rcv(net, inputq);
576}
577
578int tipc_bclink_reset_stats(struct net *net, struct tipc_link *l)
579{
580 if (!l)
581 return -ENOPROTOOPT;
582
583 tipc_bcast_lock(net);
584 tipc_link_reset_stats(l);
585 tipc_bcast_unlock(net);
586 return 0;
587}
588
589static int tipc_bc_link_set_queue_limits(struct net *net, u32 max_win)
590{
591 struct tipc_link *l = tipc_bc_sndlink(net);
592
593 if (!l)
594 return -ENOPROTOOPT;
595 if (max_win < BCLINK_WIN_MIN)
596 max_win = BCLINK_WIN_MIN;
597 if (max_win > TIPC_MAX_LINK_WIN)
598 return -EINVAL;
599 tipc_bcast_lock(net);
600 tipc_link_set_queue_limits(l, tipc_link_min_win(l), max_win);
601 tipc_bcast_unlock(net);
602 return 0;
603}
604
605static int tipc_bc_link_set_broadcast_mode(struct net *net, u32 bc_mode)
606{
607 struct tipc_bc_base *bb = tipc_bc_base(net);
608
609 switch (bc_mode) {
610 case BCLINK_MODE_BCAST:
611 if (!bb->bcast_support)
612 return -ENOPROTOOPT;
613
614 bb->force_bcast = true;
615 bb->force_rcast = false;
616 break;
617 case BCLINK_MODE_RCAST:
618 if (!bb->rcast_support)
619 return -ENOPROTOOPT;
620
621 bb->force_bcast = false;
622 bb->force_rcast = true;
623 break;
624 case BCLINK_MODE_SEL:
625 if (!bb->bcast_support || !bb->rcast_support)
626 return -ENOPROTOOPT;
627
628 bb->force_bcast = false;
629 bb->force_rcast = false;
630 break;
631 default:
632 return -EINVAL;
633 }
634
635 return 0;
636}
637
638static int tipc_bc_link_set_broadcast_ratio(struct net *net, u32 bc_ratio)
639{
640 struct tipc_bc_base *bb = tipc_bc_base(net);
641
642 if (!bb->bcast_support || !bb->rcast_support)
643 return -ENOPROTOOPT;
644
645 if (bc_ratio > 100 || bc_ratio <= 0)
646 return -EINVAL;
647
648 bb->rc_ratio = bc_ratio;
649 tipc_bcast_lock(net);
650 tipc_bcbase_calc_bc_threshold(net);
651 tipc_bcast_unlock(net);
652
653 return 0;
654}
655
656int tipc_nl_bc_link_set(struct net *net, struct nlattr *attrs[])
657{
658 int err;
659 u32 win;
660 u32 bc_mode;
661 u32 bc_ratio;
662 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
663
664 if (!attrs[TIPC_NLA_LINK_PROP])
665 return -EINVAL;
666
667 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
668 if (err)
669 return err;
670
671 if (!props[TIPC_NLA_PROP_WIN] &&
672 !props[TIPC_NLA_PROP_BROADCAST] &&
673 !props[TIPC_NLA_PROP_BROADCAST_RATIO]) {
674 return -EOPNOTSUPP;
675 }
676
677 if (props[TIPC_NLA_PROP_BROADCAST]) {
678 bc_mode = nla_get_u32(props[TIPC_NLA_PROP_BROADCAST]);
679 err = tipc_bc_link_set_broadcast_mode(net, bc_mode);
680 }
681
682 if (!err && props[TIPC_NLA_PROP_BROADCAST_RATIO]) {
683 bc_ratio = nla_get_u32(props[TIPC_NLA_PROP_BROADCAST_RATIO]);
684 err = tipc_bc_link_set_broadcast_ratio(net, bc_ratio);
685 }
686
687 if (!err && props[TIPC_NLA_PROP_WIN]) {
688 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
689 err = tipc_bc_link_set_queue_limits(net, win);
690 }
691
692 return err;
693}
694
695int tipc_bcast_init(struct net *net)
696{
697 struct tipc_net *tn = tipc_net(net);
698 struct tipc_bc_base *bb = NULL;
699 struct tipc_link *l = NULL;
700
701 bb = kzalloc_obj(*bb);
702 if (!bb)
703 goto enomem;
704 tn->bcbase = bb;
705 spin_lock_init(&tipc_net(net)->bclock);
706
707 if (!tipc_link_bc_create(net, 0, 0, NULL,
708 one_page_mtu,
709 BCLINK_WIN_DEFAULT,
710 BCLINK_WIN_DEFAULT,
711 0,
712 &bb->inputq,
713 NULL,
714 NULL,
715 &l))
716 goto enomem;
717 bb->link = l;
718 tn->bcl = l;
719 bb->rc_ratio = 10;
720 bb->rcast_support = true;
721 return 0;
722enomem:
723 kfree(bb);
724 kfree(l);
725 return -ENOMEM;
726}
727
728void tipc_bcast_stop(struct net *net)
729{
730 struct tipc_net *tn = net_generic(net, tipc_net_id);
731
732 synchronize_net();
733 kfree(tn->bcbase);
734 kfree(tn->bcl);
735}
736
737void tipc_nlist_init(struct tipc_nlist *nl, u32 self)
738{
739 memset(nl, 0, sizeof(*nl));
740 INIT_LIST_HEAD(&nl->list);
741 nl->self = self;
742}
743
744void tipc_nlist_add(struct tipc_nlist *nl, u32 node)
745{
746 if (node == nl->self)
747 nl->local = true;
748 else if (tipc_dest_push(&nl->list, node, 0))
749 nl->remote++;
750}
751
752void tipc_nlist_del(struct tipc_nlist *nl, u32 node)
753{
754 if (node == nl->self)
755 nl->local = false;
756 else if (tipc_dest_del(&nl->list, node, 0))
757 nl->remote--;
758}
759
760void tipc_nlist_purge(struct tipc_nlist *nl)
761{
762 tipc_dest_list_purge(&nl->list);
763 nl->remote = 0;
764 nl->local = false;
765}
766
767u32 tipc_bcast_get_mode(struct net *net)
768{
769 struct tipc_bc_base *bb = tipc_bc_base(net);
770
771 if (bb->force_bcast)
772 return BCLINK_MODE_BCAST;
773
774 if (bb->force_rcast)
775 return BCLINK_MODE_RCAST;
776
777 if (bb->bcast_support && bb->rcast_support)
778 return BCLINK_MODE_SEL;
779
780 return 0;
781}
782
783u32 tipc_bcast_get_broadcast_ratio(struct net *net)
784{
785 struct tipc_bc_base *bb = tipc_bc_base(net);
786
787 return bb->rc_ratio;
788}
789
790void tipc_mcast_filter_msg(struct net *net, struct sk_buff_head *defq,
791 struct sk_buff_head *inputq)
792{
793 struct sk_buff *skb, *_skb, *tmp;
794 struct tipc_msg *hdr, *_hdr;
795 bool match = false;
796 u32 node, port;
797
798 skb = skb_peek(inputq);
799 if (!skb)
800 return;
801
802 hdr = buf_msg(skb);
803
804 if (likely(!msg_is_syn(hdr) && skb_queue_empty(defq)))
805 return;
806
807 node = msg_orignode(hdr);
808 if (node == tipc_own_addr(net))
809 return;
810
811 port = msg_origport(hdr);
812
813 /* Has the twin SYN message already arrived ? */
814 skb_queue_walk(defq, _skb) {
815 _hdr = buf_msg(_skb);
816 if (msg_orignode(_hdr) != node)
817 continue;
818 if (msg_origport(_hdr) != port)
819 continue;
820 match = true;
821 break;
822 }
823
824 if (!match) {
825 if (!msg_is_syn(hdr))
826 return;
827 __skb_dequeue(inputq);
828 __skb_queue_tail(defq, skb);
829 return;
830 }
831
832 /* Deliver non-SYN message from other link, otherwise queue it */
833 if (!msg_is_syn(hdr)) {
834 if (msg_is_rcast(hdr) != msg_is_rcast(_hdr))
835 return;
836 __skb_dequeue(inputq);
837 __skb_queue_tail(defq, skb);
838 return;
839 }
840
841 /* Queue non-SYN/SYN message from same link */
842 if (msg_is_rcast(hdr) == msg_is_rcast(_hdr)) {
843 __skb_dequeue(inputq);
844 __skb_queue_tail(defq, skb);
845 return;
846 }
847
848 /* Matching SYN messages => return the one with data, if any */
849 __skb_unlink(_skb, defq);
850 if (msg_data_sz(hdr)) {
851 kfree_skb(_skb);
852 } else {
853 __skb_dequeue(inputq);
854 kfree_skb(skb);
855 __skb_queue_tail(inputq, _skb);
856 }
857
858 /* Deliver subsequent non-SYN messages from same peer */
859 skb_queue_walk_safe(defq, _skb, tmp) {
860 _hdr = buf_msg(_skb);
861 if (msg_orignode(_hdr) != node)
862 continue;
863 if (msg_origport(_hdr) != port)
864 continue;
865 if (msg_is_syn(_hdr))
866 break;
867 __skb_unlink(_skb, defq);
868 __skb_queue_tail(inputq, _skb);
869 }
870}