2 * net/tipc/bcast.c: TIPC broadcast code
4 * Copyright (c) 2004-2006, 2014-2017, Ericsson AB
5 * Copyright (c) 2004, Intel Corporation.
6 * Copyright (c) 2005, 2010-2011, Wind River Systems
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
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.
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.
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.
38 #include <linux/tipc_config.h>
43 #include "name_table.h"
45 #define BCLINK_WIN_DEFAULT 50 /* bcast link window size (default) */
46 #define BCLINK_WIN_MIN 32 /* bcast minimum link window size */
48 const char tipc_bclink_name
[] = "broadcast-link";
51 * struct tipc_bc_base - base structure for keeping broadcast send state
52 * @link: broadcast send link structure
53 * @inputq: data input queue; will only carry SOCK_WAKEUP messages
54 * @dests: array keeping number of reachable destinations per bearer
55 * @primary_bearer: a bearer having links to all broadcast destinations, if any
56 * @bcast_support: indicates if primary bearer, if any, supports broadcast
57 * @force_bcast: forces broadcast for multicast traffic
58 * @rcast_support: indicates if all peer nodes support replicast
59 * @force_rcast: forces replicast for multicast traffic
60 * @rc_ratio: dest count as percentage of cluster size where send method changes
61 * @bc_threshold: calculated from rc_ratio; if dests > threshold use broadcast
64 struct tipc_link
*link
;
65 struct sk_buff_head inputq
;
66 int dests
[MAX_BEARERS
];
76 static struct tipc_bc_base
*tipc_bc_base(struct net
*net
)
78 return tipc_net(net
)->bcbase
;
81 /* tipc_bcast_get_mtu(): -get the MTU currently used by broadcast link
82 * Note: the MTU is decremented to give room for a tunnel header, in
83 * case the message needs to be sent as replicast
85 int tipc_bcast_get_mtu(struct net
*net
)
87 return tipc_link_mtu(tipc_bc_sndlink(net
)) - INT_H_SIZE
;
90 void tipc_bcast_disable_rcast(struct net
*net
)
92 tipc_bc_base(net
)->rcast_support
= false;
95 static void tipc_bcbase_calc_bc_threshold(struct net
*net
)
97 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
98 int cluster_size
= tipc_link_bc_peers(tipc_bc_sndlink(net
));
100 bb
->bc_threshold
= 1 + (cluster_size
* bb
->rc_ratio
/ 100);
103 /* tipc_bcbase_select_primary(): find a bearer with links to all destinations,
104 * if any, and make it primary bearer
106 static void tipc_bcbase_select_primary(struct net
*net
)
108 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
109 int all_dests
= tipc_link_bc_peers(bb
->link
);
112 bb
->primary_bearer
= INVALID_BEARER_ID
;
113 bb
->bcast_support
= true;
118 for (i
= 0; i
< MAX_BEARERS
; i
++) {
122 mtu
= tipc_bearer_mtu(net
, i
);
123 if (mtu
< tipc_link_mtu(bb
->link
))
124 tipc_link_set_mtu(bb
->link
, mtu
);
125 bb
->bcast_support
&= tipc_bearer_bcast_support(net
, i
);
126 if (bb
->dests
[i
] < all_dests
)
129 bb
->primary_bearer
= i
;
131 /* Reduce risk that all nodes select same primary */
132 if ((i
^ tipc_own_addr(net
)) & 1)
135 prim
= bb
->primary_bearer
;
136 if (prim
!= INVALID_BEARER_ID
)
137 bb
->bcast_support
= tipc_bearer_bcast_support(net
, prim
);
140 void tipc_bcast_inc_bearer_dst_cnt(struct net
*net
, int bearer_id
)
142 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
144 tipc_bcast_lock(net
);
145 bb
->dests
[bearer_id
]++;
146 tipc_bcbase_select_primary(net
);
147 tipc_bcast_unlock(net
);
150 void tipc_bcast_dec_bearer_dst_cnt(struct net
*net
, int bearer_id
)
152 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
154 tipc_bcast_lock(net
);
155 bb
->dests
[bearer_id
]--;
156 tipc_bcbase_select_primary(net
);
157 tipc_bcast_unlock(net
);
160 /* tipc_bcbase_xmit - broadcast a packet queue across one or more bearers
162 * Note that number of reachable destinations, as indicated in the dests[]
163 * array, may transitionally differ from the number of destinations indicated
164 * in each sent buffer. We can sustain this. Excess destination nodes will
165 * drop and never acknowledge the unexpected packets, and missing destinations
166 * will either require retransmission (if they are just about to be added to
167 * the bearer), or be removed from the buffer's 'ackers' counter (if they
170 static void tipc_bcbase_xmit(struct net
*net
, struct sk_buff_head
*xmitq
)
173 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
174 struct sk_buff
*skb
, *_skb
;
175 struct sk_buff_head _xmitq
;
177 if (skb_queue_empty(xmitq
))
180 /* The typical case: at least one bearer has links to all nodes */
181 bearer_id
= bb
->primary_bearer
;
182 if (bearer_id
>= 0) {
183 tipc_bearer_bc_xmit(net
, bearer_id
, xmitq
);
187 /* We have to transmit across all bearers */
188 __skb_queue_head_init(&_xmitq
);
189 for (bearer_id
= 0; bearer_id
< MAX_BEARERS
; bearer_id
++) {
190 if (!bb
->dests
[bearer_id
])
193 skb_queue_walk(xmitq
, skb
) {
194 _skb
= pskb_copy_for_clone(skb
, GFP_ATOMIC
);
197 __skb_queue_tail(&_xmitq
, _skb
);
199 tipc_bearer_bc_xmit(net
, bearer_id
, &_xmitq
);
201 __skb_queue_purge(xmitq
);
202 __skb_queue_purge(&_xmitq
);
205 static void tipc_bcast_select_xmit_method(struct net
*net
, int dests
,
206 struct tipc_mc_method
*method
)
208 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
209 unsigned long exp
= method
->expires
;
211 /* Broadcast supported by used bearer/bearers? */
212 if (!bb
->bcast_support
) {
213 method
->rcast
= true;
216 /* Any destinations which don't support replicast ? */
217 if (!bb
->rcast_support
) {
218 method
->rcast
= false;
221 /* Can current method be changed ? */
222 method
->expires
= jiffies
+ TIPC_METHOD_EXPIRE
;
223 if (method
->mandatory
)
226 if (!(tipc_net(net
)->capabilities
& TIPC_MCAST_RBCTL
) &&
227 time_before(jiffies
, exp
))
230 /* Configuration as force 'broadcast' method */
231 if (bb
->force_bcast
) {
232 method
->rcast
= false;
235 /* Configuration as force 'replicast' method */
236 if (bb
->force_rcast
) {
237 method
->rcast
= true;
240 /* Configuration as 'autoselect' or default method */
241 /* Determine method to use now */
242 method
->rcast
= dests
<= bb
->bc_threshold
;
245 /* tipc_bcast_xmit - broadcast the buffer chain to all external nodes
246 * @net: the applicable net namespace
247 * @pkts: chain of buffers containing message
248 * @cong_link_cnt: set to 1 if broadcast link is congested, otherwise 0
249 * Consumes the buffer chain.
250 * Returns 0 if success, otherwise errno: -EHOSTUNREACH,-EMSGSIZE
252 static int tipc_bcast_xmit(struct net
*net
, struct sk_buff_head
*pkts
,
255 struct tipc_link
*l
= tipc_bc_sndlink(net
);
256 struct sk_buff_head xmitq
;
259 __skb_queue_head_init(&xmitq
);
260 tipc_bcast_lock(net
);
261 if (tipc_link_bc_peers(l
))
262 rc
= tipc_link_xmit(l
, pkts
, &xmitq
);
263 tipc_bcast_unlock(net
);
264 tipc_bcbase_xmit(net
, &xmitq
);
265 __skb_queue_purge(pkts
);
266 if (rc
== -ELINKCONG
) {
273 /* tipc_rcast_xmit - replicate and send a message to given destination nodes
274 * @net: the applicable net namespace
275 * @pkts: chain of buffers containing message
276 * @dests: list of destination nodes
277 * @cong_link_cnt: returns number of congested links
278 * @cong_links: returns identities of congested links
279 * Returns 0 if success, otherwise errno
281 static int tipc_rcast_xmit(struct net
*net
, struct sk_buff_head
*pkts
,
282 struct tipc_nlist
*dests
, u16
*cong_link_cnt
)
284 struct tipc_dest
*dst
, *tmp
;
285 struct sk_buff_head _pkts
;
288 selector
= msg_link_selector(buf_msg(skb_peek(pkts
)));
289 __skb_queue_head_init(&_pkts
);
291 list_for_each_entry_safe(dst
, tmp
, &dests
->list
, list
) {
293 if (!tipc_msg_pskb_copy(dnode
, pkts
, &_pkts
))
296 /* Any other return value than -ELINKCONG is ignored */
297 if (tipc_node_xmit(net
, &_pkts
, dnode
, selector
) == -ELINKCONG
)
303 /* tipc_mcast_send_sync - deliver a dummy message with SYN bit
304 * @net: the applicable net namespace
305 * @skb: socket buffer to copy
306 * @method: send method to be used
307 * @dests: destination nodes for message.
308 * @cong_link_cnt: returns number of encountered congested destination links
309 * Returns 0 if success, otherwise errno
311 static int tipc_mcast_send_sync(struct net
*net
, struct sk_buff
*skb
,
312 struct tipc_mc_method
*method
,
313 struct tipc_nlist
*dests
,
316 struct tipc_msg
*hdr
, *_hdr
;
317 struct sk_buff_head tmpq
;
318 struct sk_buff
*_skb
;
320 /* Is a cluster supporting with new capabilities ? */
321 if (!(tipc_net(net
)->capabilities
& TIPC_MCAST_RBCTL
))
325 if (msg_user(hdr
) == MSG_FRAGMENTER
)
326 hdr
= msg_inner_hdr(hdr
);
327 if (msg_type(hdr
) != TIPC_MCAST_MSG
)
330 /* Allocate dummy message */
331 _skb
= tipc_buf_acquire(MCAST_H_SIZE
, GFP_KERNEL
);
335 /* Preparing for 'synching' header */
338 /* Copy skb's header into a dummy header */
339 skb_copy_to_linear_data(_skb
, hdr
, MCAST_H_SIZE
);
342 /* Reverse method for dummy message */
343 _hdr
= buf_msg(_skb
);
344 msg_set_size(_hdr
, MCAST_H_SIZE
);
345 msg_set_is_rcast(_hdr
, !msg_is_rcast(hdr
));
347 __skb_queue_head_init(&tmpq
);
348 __skb_queue_tail(&tmpq
, _skb
);
350 tipc_bcast_xmit(net
, &tmpq
, cong_link_cnt
);
352 tipc_rcast_xmit(net
, &tmpq
, dests
, cong_link_cnt
);
354 /* This queue should normally be empty by now */
355 __skb_queue_purge(&tmpq
);
360 /* tipc_mcast_xmit - deliver message to indicated destination nodes
361 * and to identified node local sockets
362 * @net: the applicable net namespace
363 * @pkts: chain of buffers containing message
364 * @method: send method to be used
365 * @dests: destination nodes for message.
366 * @cong_link_cnt: returns number of encountered congested destination links
367 * Consumes buffer chain.
368 * Returns 0 if success, otherwise errno
370 int tipc_mcast_xmit(struct net
*net
, struct sk_buff_head
*pkts
,
371 struct tipc_mc_method
*method
, struct tipc_nlist
*dests
,
374 struct sk_buff_head inputq
, localq
;
375 bool rcast
= method
->rcast
;
376 struct tipc_msg
*hdr
;
380 skb_queue_head_init(&inputq
);
381 __skb_queue_head_init(&localq
);
383 /* Clone packets before they are consumed by next call */
384 if (dests
->local
&& !tipc_msg_reassemble(pkts
, &localq
)) {
388 /* Send according to determined transmit method */
390 tipc_bcast_select_xmit_method(net
, dests
->remote
, method
);
392 skb
= skb_peek(pkts
);
394 if (msg_user(hdr
) == MSG_FRAGMENTER
)
395 hdr
= msg_inner_hdr(hdr
);
396 msg_set_is_rcast(hdr
, method
->rcast
);
398 /* Switch method ? */
399 if (rcast
!= method
->rcast
)
400 tipc_mcast_send_sync(net
, skb
, method
,
401 dests
, cong_link_cnt
);
404 rc
= tipc_rcast_xmit(net
, pkts
, dests
, cong_link_cnt
);
406 rc
= tipc_bcast_xmit(net
, pkts
, cong_link_cnt
);
410 tipc_loopback_trace(net
, &localq
);
411 tipc_sk_mcast_rcv(net
, &localq
, &inputq
);
414 /* This queue should normally be empty by now */
415 __skb_queue_purge(pkts
);
419 /* tipc_bcast_rcv - receive a broadcast packet, and deliver to rcv link
421 * RCU is locked, no other locks set
423 int tipc_bcast_rcv(struct net
*net
, struct tipc_link
*l
, struct sk_buff
*skb
)
425 struct tipc_msg
*hdr
= buf_msg(skb
);
426 struct sk_buff_head
*inputq
= &tipc_bc_base(net
)->inputq
;
427 struct sk_buff_head xmitq
;
430 __skb_queue_head_init(&xmitq
);
432 if (msg_mc_netid(hdr
) != tipc_netid(net
) || !tipc_link_is_up(l
)) {
437 tipc_bcast_lock(net
);
438 if (msg_user(hdr
) == BCAST_PROTOCOL
)
439 rc
= tipc_link_bc_nack_rcv(l
, skb
, &xmitq
);
441 rc
= tipc_link_rcv(l
, skb
, NULL
);
442 tipc_bcast_unlock(net
);
444 tipc_bcbase_xmit(net
, &xmitq
);
446 /* Any socket wakeup messages ? */
447 if (!skb_queue_empty(inputq
))
448 tipc_sk_rcv(net
, inputq
);
453 /* tipc_bcast_ack_rcv - receive and handle a broadcast acknowledge
455 * RCU is locked, no other locks set
457 void tipc_bcast_ack_rcv(struct net
*net
, struct tipc_link
*l
,
458 struct tipc_msg
*hdr
)
460 struct sk_buff_head
*inputq
= &tipc_bc_base(net
)->inputq
;
461 u16 acked
= msg_bcast_ack(hdr
);
462 struct sk_buff_head xmitq
;
464 /* Ignore bc acks sent by peer before bcast synch point was received */
465 if (msg_bc_ack_invalid(hdr
))
468 __skb_queue_head_init(&xmitq
);
470 tipc_bcast_lock(net
);
471 tipc_link_bc_ack_rcv(l
, acked
, &xmitq
);
472 tipc_bcast_unlock(net
);
474 tipc_bcbase_xmit(net
, &xmitq
);
476 /* Any socket wakeup messages ? */
477 if (!skb_queue_empty(inputq
))
478 tipc_sk_rcv(net
, inputq
);
481 /* tipc_bcast_synch_rcv - check and update rcv link with peer's send state
483 * RCU is locked, no other locks set
485 int tipc_bcast_sync_rcv(struct net
*net
, struct tipc_link
*l
,
486 struct tipc_msg
*hdr
)
488 struct sk_buff_head
*inputq
= &tipc_bc_base(net
)->inputq
;
489 struct sk_buff_head xmitq
;
492 __skb_queue_head_init(&xmitq
);
494 tipc_bcast_lock(net
);
495 if (msg_type(hdr
) != STATE_MSG
) {
496 tipc_link_bc_init_rcv(l
, hdr
);
497 } else if (!msg_bc_ack_invalid(hdr
)) {
498 tipc_link_bc_ack_rcv(l
, msg_bcast_ack(hdr
), &xmitq
);
499 rc
= tipc_link_bc_sync_rcv(l
, hdr
, &xmitq
);
501 tipc_bcast_unlock(net
);
503 tipc_bcbase_xmit(net
, &xmitq
);
505 /* Any socket wakeup messages ? */
506 if (!skb_queue_empty(inputq
))
507 tipc_sk_rcv(net
, inputq
);
511 /* tipc_bcast_add_peer - add a peer node to broadcast link and bearer
513 * RCU is locked, node lock is set
515 void tipc_bcast_add_peer(struct net
*net
, struct tipc_link
*uc_l
,
516 struct sk_buff_head
*xmitq
)
518 struct tipc_link
*snd_l
= tipc_bc_sndlink(net
);
520 tipc_bcast_lock(net
);
521 tipc_link_add_bc_peer(snd_l
, uc_l
, xmitq
);
522 tipc_bcbase_select_primary(net
);
523 tipc_bcbase_calc_bc_threshold(net
);
524 tipc_bcast_unlock(net
);
527 /* tipc_bcast_remove_peer - remove a peer node from broadcast link and bearer
529 * RCU is locked, node lock is set
531 void tipc_bcast_remove_peer(struct net
*net
, struct tipc_link
*rcv_l
)
533 struct tipc_link
*snd_l
= tipc_bc_sndlink(net
);
534 struct sk_buff_head
*inputq
= &tipc_bc_base(net
)->inputq
;
535 struct sk_buff_head xmitq
;
537 __skb_queue_head_init(&xmitq
);
539 tipc_bcast_lock(net
);
540 tipc_link_remove_bc_peer(snd_l
, rcv_l
, &xmitq
);
541 tipc_bcbase_select_primary(net
);
542 tipc_bcbase_calc_bc_threshold(net
);
543 tipc_bcast_unlock(net
);
545 tipc_bcbase_xmit(net
, &xmitq
);
547 /* Any socket wakeup messages ? */
548 if (!skb_queue_empty(inputq
))
549 tipc_sk_rcv(net
, inputq
);
552 int tipc_bclink_reset_stats(struct net
*net
)
554 struct tipc_link
*l
= tipc_bc_sndlink(net
);
559 tipc_bcast_lock(net
);
560 tipc_link_reset_stats(l
);
561 tipc_bcast_unlock(net
);
565 static int tipc_bc_link_set_queue_limits(struct net
*net
, u32 limit
)
567 struct tipc_link
*l
= tipc_bc_sndlink(net
);
571 if (limit
< BCLINK_WIN_MIN
)
572 limit
= BCLINK_WIN_MIN
;
573 if (limit
> TIPC_MAX_LINK_WIN
)
575 tipc_bcast_lock(net
);
576 tipc_link_set_queue_limits(l
, limit
);
577 tipc_bcast_unlock(net
);
581 static int tipc_bc_link_set_broadcast_mode(struct net
*net
, u32 bc_mode
)
583 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
586 case BCLINK_MODE_BCAST
:
587 if (!bb
->bcast_support
)
590 bb
->force_bcast
= true;
591 bb
->force_rcast
= false;
593 case BCLINK_MODE_RCAST
:
594 if (!bb
->rcast_support
)
597 bb
->force_bcast
= false;
598 bb
->force_rcast
= true;
600 case BCLINK_MODE_SEL
:
601 if (!bb
->bcast_support
|| !bb
->rcast_support
)
604 bb
->force_bcast
= false;
605 bb
->force_rcast
= false;
614 static int tipc_bc_link_set_broadcast_ratio(struct net
*net
, u32 bc_ratio
)
616 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
618 if (!bb
->bcast_support
|| !bb
->rcast_support
)
621 if (bc_ratio
> 100 || bc_ratio
<= 0)
624 bb
->rc_ratio
= bc_ratio
;
625 tipc_bcast_lock(net
);
626 tipc_bcbase_calc_bc_threshold(net
);
627 tipc_bcast_unlock(net
);
632 int tipc_nl_bc_link_set(struct net
*net
, struct nlattr
*attrs
[])
638 struct nlattr
*props
[TIPC_NLA_PROP_MAX
+ 1];
640 if (!attrs
[TIPC_NLA_LINK_PROP
])
643 err
= tipc_nl_parse_link_prop(attrs
[TIPC_NLA_LINK_PROP
], props
);
647 if (!props
[TIPC_NLA_PROP_WIN
] &&
648 !props
[TIPC_NLA_PROP_BROADCAST
] &&
649 !props
[TIPC_NLA_PROP_BROADCAST_RATIO
]) {
653 if (props
[TIPC_NLA_PROP_BROADCAST
]) {
654 bc_mode
= nla_get_u32(props
[TIPC_NLA_PROP_BROADCAST
]);
655 err
= tipc_bc_link_set_broadcast_mode(net
, bc_mode
);
658 if (!err
&& props
[TIPC_NLA_PROP_BROADCAST_RATIO
]) {
659 bc_ratio
= nla_get_u32(props
[TIPC_NLA_PROP_BROADCAST_RATIO
]);
660 err
= tipc_bc_link_set_broadcast_ratio(net
, bc_ratio
);
663 if (!err
&& props
[TIPC_NLA_PROP_WIN
]) {
664 win
= nla_get_u32(props
[TIPC_NLA_PROP_WIN
]);
665 err
= tipc_bc_link_set_queue_limits(net
, win
);
671 int tipc_bcast_init(struct net
*net
)
673 struct tipc_net
*tn
= tipc_net(net
);
674 struct tipc_bc_base
*bb
= NULL
;
675 struct tipc_link
*l
= NULL
;
677 bb
= kzalloc(sizeof(*bb
), GFP_KERNEL
);
681 spin_lock_init(&tipc_net(net
)->bclock
);
683 if (!tipc_link_bc_create(net
, 0, 0,
695 bb
->rcast_support
= true;
703 void tipc_bcast_stop(struct net
*net
)
705 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
712 void tipc_nlist_init(struct tipc_nlist
*nl
, u32 self
)
714 memset(nl
, 0, sizeof(*nl
));
715 INIT_LIST_HEAD(&nl
->list
);
719 void tipc_nlist_add(struct tipc_nlist
*nl
, u32 node
)
721 if (node
== nl
->self
)
723 else if (tipc_dest_push(&nl
->list
, node
, 0))
727 void tipc_nlist_del(struct tipc_nlist
*nl
, u32 node
)
729 if (node
== nl
->self
)
731 else if (tipc_dest_del(&nl
->list
, node
, 0))
735 void tipc_nlist_purge(struct tipc_nlist
*nl
)
737 tipc_dest_list_purge(&nl
->list
);
742 u32
tipc_bcast_get_broadcast_mode(struct net
*net
)
744 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
747 return BCLINK_MODE_BCAST
;
750 return BCLINK_MODE_RCAST
;
752 if (bb
->bcast_support
&& bb
->rcast_support
)
753 return BCLINK_MODE_SEL
;
758 u32
tipc_bcast_get_broadcast_ratio(struct net
*net
)
760 struct tipc_bc_base
*bb
= tipc_bc_base(net
);
765 void tipc_mcast_filter_msg(struct net
*net
, struct sk_buff_head
*defq
,
766 struct sk_buff_head
*inputq
)
768 struct sk_buff
*skb
, *_skb
, *tmp
;
769 struct tipc_msg
*hdr
, *_hdr
;
773 skb
= skb_peek(inputq
);
779 if (likely(!msg_is_syn(hdr
) && skb_queue_empty(defq
)))
782 node
= msg_orignode(hdr
);
783 if (node
== tipc_own_addr(net
))
786 port
= msg_origport(hdr
);
788 /* Has the twin SYN message already arrived ? */
789 skb_queue_walk(defq
, _skb
) {
790 _hdr
= buf_msg(_skb
);
791 if (msg_orignode(_hdr
) != node
)
793 if (msg_origport(_hdr
) != port
)
800 if (!msg_is_syn(hdr
))
802 __skb_dequeue(inputq
);
803 __skb_queue_tail(defq
, skb
);
807 /* Deliver non-SYN message from other link, otherwise queue it */
808 if (!msg_is_syn(hdr
)) {
809 if (msg_is_rcast(hdr
) != msg_is_rcast(_hdr
))
811 __skb_dequeue(inputq
);
812 __skb_queue_tail(defq
, skb
);
816 /* Queue non-SYN/SYN message from same link */
817 if (msg_is_rcast(hdr
) == msg_is_rcast(_hdr
)) {
818 __skb_dequeue(inputq
);
819 __skb_queue_tail(defq
, skb
);
823 /* Matching SYN messages => return the one with data, if any */
824 __skb_unlink(_skb
, defq
);
825 if (msg_data_sz(hdr
)) {
828 __skb_dequeue(inputq
);
830 __skb_queue_tail(inputq
, _skb
);
833 /* Deliver subsequent non-SYN messages from same peer */
834 skb_queue_walk_safe(defq
, _skb
, tmp
) {
835 _hdr
= buf_msg(_skb
);
836 if (msg_orignode(_hdr
) != node
)
838 if (msg_origport(_hdr
) != port
)
840 if (msg_is_syn(_hdr
))
842 __skb_unlink(_skb
, defq
);
843 __skb_queue_tail(inputq
, _skb
);