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";
49 unsigned long sysctl_tipc_bc_retruni __read_mostly;
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
65 struct tipc_link *link;
66 struct sk_buff_head inputq;
67 int dests[MAX_BEARERS];
77 static struct tipc_bc_base *tipc_bc_base(struct net *net)
79 return tipc_net(net)->bcbase;
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
86 int tipc_bcast_get_mtu(struct net *net)
88 return tipc_link_mss(tipc_bc_sndlink(net));
91 void tipc_bcast_toggle_rcast(struct net *net, bool supp)
93 tipc_bc_base(net)->rcast_support = supp;
96 static void tipc_bcbase_calc_bc_threshold(struct net *net)
98 struct tipc_bc_base *bb = tipc_bc_base(net);
99 int cluster_size = tipc_link_bc_peers(tipc_bc_sndlink(net));
101 bb->bc_threshold = 1 + (cluster_size * bb->rc_ratio / 100);
104 /* tipc_bcbase_select_primary(): find a bearer with links to all destinations,
105 * if any, and make it primary bearer
107 static void tipc_bcbase_select_primary(struct net *net)
109 struct tipc_bc_base *bb = tipc_bc_base(net);
110 int all_dests = tipc_link_bc_peers(bb->link);
113 bb->primary_bearer = INVALID_BEARER_ID;
114 bb->bcast_support = true;
119 for (i = 0; i < MAX_BEARERS; i++) {
123 mtu = tipc_bearer_mtu(net, i);
124 if (mtu < tipc_link_mtu(bb->link))
125 tipc_link_set_mtu(bb->link, mtu);
126 bb->bcast_support &= tipc_bearer_bcast_support(net, i);
127 if (bb->dests[i] < all_dests)
130 bb->primary_bearer = i;
132 /* Reduce risk that all nodes select same primary */
133 if ((i ^ tipc_own_addr(net)) & 1)
136 prim = bb->primary_bearer;
137 if (prim != INVALID_BEARER_ID)
138 bb->bcast_support = tipc_bearer_bcast_support(net, prim);
141 void tipc_bcast_inc_bearer_dst_cnt(struct net *net, int bearer_id)
143 struct tipc_bc_base *bb = tipc_bc_base(net);
145 tipc_bcast_lock(net);
146 bb->dests[bearer_id]++;
147 tipc_bcbase_select_primary(net);
148 tipc_bcast_unlock(net);
151 void tipc_bcast_dec_bearer_dst_cnt(struct net *net, int bearer_id)
153 struct tipc_bc_base *bb = tipc_bc_base(net);
155 tipc_bcast_lock(net);
156 bb->dests[bearer_id]--;
157 tipc_bcbase_select_primary(net);
158 tipc_bcast_unlock(net);
161 /* tipc_bcbase_xmit - broadcast a packet queue across one or more bearers
163 * Note that number of reachable destinations, as indicated in the dests[]
164 * array, may transitionally differ from the number of destinations indicated
165 * in each sent buffer. We can sustain this. Excess destination nodes will
166 * drop and never acknowledge the unexpected packets, and missing destinations
167 * will either require retransmission (if they are just about to be added to
168 * the bearer), or be removed from the buffer's 'ackers' counter (if they
171 static void tipc_bcbase_xmit(struct net *net, struct sk_buff_head *xmitq)
174 struct tipc_bc_base *bb = tipc_bc_base(net);
175 struct sk_buff *skb, *_skb;
176 struct sk_buff_head _xmitq;
178 if (skb_queue_empty(xmitq))
181 /* The typical case: at least one bearer has links to all nodes */
182 bearer_id = bb->primary_bearer;
183 if (bearer_id >= 0) {
184 tipc_bearer_bc_xmit(net, bearer_id, xmitq);
188 /* We have to transmit across all bearers */
189 __skb_queue_head_init(&_xmitq);
190 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
191 if (!bb->dests[bearer_id])
194 skb_queue_walk(xmitq, skb) {
195 _skb = pskb_copy_for_clone(skb, GFP_ATOMIC);
198 __skb_queue_tail(&_xmitq, _skb);
200 tipc_bearer_bc_xmit(net, bearer_id, &_xmitq);
202 __skb_queue_purge(xmitq);
203 __skb_queue_purge(&_xmitq);
206 static void tipc_bcast_select_xmit_method(struct net *net, int dests,
207 struct tipc_mc_method *method)
209 struct tipc_bc_base *bb = tipc_bc_base(net);
210 unsigned long exp = method->expires;
212 /* Broadcast supported by used bearer/bearers? */
213 if (!bb->bcast_support) {
214 method->rcast = true;
217 /* Any destinations which don't support replicast ? */
218 if (!bb->rcast_support) {
219 method->rcast = false;
222 /* Can current method be changed ? */
223 method->expires = jiffies + TIPC_METHOD_EXPIRE;
224 if (method->mandatory)
227 if (!(tipc_net(net)->capabilities & TIPC_MCAST_RBCTL) &&
228 time_before(jiffies, exp))
231 /* Configuration as force 'broadcast' method */
232 if (bb->force_bcast) {
233 method->rcast = false;
236 /* Configuration as force 'replicast' method */
237 if (bb->force_rcast) {
238 method->rcast = true;
241 /* Configuration as 'autoselect' or default method */
242 /* Determine method to use now */
243 method->rcast = dests <= bb->bc_threshold;
246 /* tipc_bcast_xmit - broadcast the buffer chain to all external nodes
247 * @net: the applicable net namespace
248 * @pkts: chain of buffers containing message
249 * @cong_link_cnt: set to 1 if broadcast link is congested, otherwise 0
250 * Consumes the buffer chain.
251 * Returns 0 if success, otherwise errno: -EHOSTUNREACH,-EMSGSIZE
253 static int tipc_bcast_xmit(struct net *net, struct sk_buff_head *pkts,
256 struct tipc_link *l = tipc_bc_sndlink(net);
257 struct sk_buff_head xmitq;
260 __skb_queue_head_init(&xmitq);
261 tipc_bcast_lock(net);
262 if (tipc_link_bc_peers(l))
263 rc = tipc_link_xmit(l, pkts, &xmitq);
264 tipc_bcast_unlock(net);
265 tipc_bcbase_xmit(net, &xmitq);
266 __skb_queue_purge(pkts);
267 if (rc == -ELINKCONG) {
274 /* tipc_rcast_xmit - replicate and send a message to given destination nodes
275 * @net: the applicable net namespace
276 * @pkts: chain of buffers containing message
277 * @dests: list of destination nodes
278 * @cong_link_cnt: returns number of congested links
279 * @cong_links: returns identities of congested links
280 * Returns 0 if success, otherwise errno
282 static int tipc_rcast_xmit(struct net *net, struct sk_buff_head *pkts,
283 struct tipc_nlist *dests, u16 *cong_link_cnt)
285 struct tipc_dest *dst, *tmp;
286 struct sk_buff_head _pkts;
289 selector = msg_link_selector(buf_msg(skb_peek(pkts)));
290 __skb_queue_head_init(&_pkts);
292 list_for_each_entry_safe(dst, tmp, &dests->list, list) {
294 if (!tipc_msg_pskb_copy(dnode, pkts, &_pkts))
297 /* Any other return value than -ELINKCONG is ignored */
298 if (tipc_node_xmit(net, &_pkts, dnode, selector) == -ELINKCONG)
304 /* tipc_mcast_send_sync - deliver a dummy message with SYN bit
305 * @net: the applicable net namespace
306 * @skb: socket buffer to copy
307 * @method: send method to be used
308 * @dests: destination nodes for message.
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)
315 struct tipc_msg *hdr, *_hdr;
316 struct sk_buff_head tmpq;
317 struct sk_buff *_skb;
321 /* Is a cluster supporting with new capabilities ? */
322 if (!(tipc_net(net)->capabilities & TIPC_MCAST_RBCTL))
326 if (msg_user(hdr) == MSG_FRAGMENTER)
327 hdr = msg_inner_hdr(hdr);
328 if (msg_type(hdr) != TIPC_MCAST_MSG)
331 /* Allocate dummy message */
332 _skb = tipc_buf_acquire(MCAST_H_SIZE, GFP_KERNEL);
336 /* Preparing for 'synching' header */
339 /* Copy skb's header into a dummy header */
340 skb_copy_to_linear_data(_skb, hdr, MCAST_H_SIZE);
343 /* Reverse method for dummy message */
344 _hdr = buf_msg(_skb);
345 msg_set_size(_hdr, MCAST_H_SIZE);
346 msg_set_is_rcast(_hdr, !msg_is_rcast(hdr));
347 msg_set_errcode(_hdr, TIPC_ERR_NO_PORT);
349 __skb_queue_head_init(&tmpq);
350 __skb_queue_tail(&tmpq, _skb);
352 rc = tipc_bcast_xmit(net, &tmpq, &cong_link_cnt);
354 rc = tipc_rcast_xmit(net, &tmpq, dests, &cong_link_cnt);
356 /* This queue should normally be empty by now */
357 __skb_queue_purge(&tmpq);
362 /* tipc_mcast_xmit - deliver message to indicated destination nodes
363 * and to identified node local sockets
364 * @net: the applicable net namespace
365 * @pkts: chain of buffers containing message
366 * @method: send method to be used
367 * @dests: destination nodes for message.
368 * @cong_link_cnt: returns number of encountered congested destination links
369 * Consumes buffer chain.
370 * Returns 0 if success, otherwise errno
372 int tipc_mcast_xmit(struct net *net, struct sk_buff_head *pkts,
373 struct tipc_mc_method *method, struct tipc_nlist *dests,
376 struct sk_buff_head inputq, localq;
377 bool rcast = method->rcast;
378 struct tipc_msg *hdr;
382 skb_queue_head_init(&inputq);
383 __skb_queue_head_init(&localq);
385 /* Clone packets before they are consumed by next call */
386 if (dests->local && !tipc_msg_reassemble(pkts, &localq)) {
390 /* Send according to determined transmit method */
392 tipc_bcast_select_xmit_method(net, dests->remote, method);
394 skb = skb_peek(pkts);
396 if (msg_user(hdr) == MSG_FRAGMENTER)
397 hdr = msg_inner_hdr(hdr);
398 msg_set_is_rcast(hdr, method->rcast);
400 /* Switch method ? */
401 if (rcast != method->rcast) {
402 rc = tipc_mcast_send_sync(net, skb, method, dests);
404 pr_err("Unable to send SYN: method %d, rc %d\n",
411 rc = tipc_rcast_xmit(net, pkts, dests, cong_link_cnt);
413 rc = tipc_bcast_xmit(net, pkts, cong_link_cnt);
417 tipc_loopback_trace(net, &localq);
418 tipc_sk_mcast_rcv(net, &localq, &inputq);
421 /* This queue should normally be empty by now */
422 __skb_queue_purge(pkts);
426 /* tipc_bcast_rcv - receive a broadcast packet, and deliver to rcv link
428 * RCU is locked, no other locks set
430 int tipc_bcast_rcv(struct net *net, struct tipc_link *l, struct sk_buff *skb)
432 struct tipc_msg *hdr = buf_msg(skb);
433 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
434 struct sk_buff_head xmitq;
437 __skb_queue_head_init(&xmitq);
439 if (msg_mc_netid(hdr) != tipc_netid(net) || !tipc_link_is_up(l)) {
444 tipc_bcast_lock(net);
445 if (msg_user(hdr) == BCAST_PROTOCOL)
446 rc = tipc_link_bc_nack_rcv(l, skb, &xmitq);
448 rc = tipc_link_rcv(l, skb, NULL);
449 tipc_bcast_unlock(net);
451 tipc_bcbase_xmit(net, &xmitq);
453 /* Any socket wakeup messages ? */
454 if (!skb_queue_empty(inputq))
455 tipc_sk_rcv(net, inputq);
460 /* tipc_bcast_ack_rcv - receive and handle a broadcast acknowledge
462 * RCU is locked, no other locks set
464 void tipc_bcast_ack_rcv(struct net *net, struct tipc_link *l,
465 struct tipc_msg *hdr)
467 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
468 u16 acked = msg_bcast_ack(hdr);
469 struct sk_buff_head xmitq;
471 /* Ignore bc acks sent by peer before bcast synch point was received */
472 if (msg_bc_ack_invalid(hdr))
475 __skb_queue_head_init(&xmitq);
477 tipc_bcast_lock(net);
478 tipc_link_bc_ack_rcv(l, acked, 0, NULL, &xmitq, NULL);
479 tipc_bcast_unlock(net);
481 tipc_bcbase_xmit(net, &xmitq);
483 /* Any socket wakeup messages ? */
484 if (!skb_queue_empty(inputq))
485 tipc_sk_rcv(net, inputq);
488 /* tipc_bcast_synch_rcv - check and update rcv link with peer's send state
490 * RCU is locked, no other locks set
492 int tipc_bcast_sync_rcv(struct net *net, struct tipc_link *l,
493 struct tipc_msg *hdr,
494 struct sk_buff_head *retrq)
496 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
497 struct tipc_gap_ack_blks *ga;
498 struct sk_buff_head xmitq;
501 __skb_queue_head_init(&xmitq);
503 tipc_bcast_lock(net);
504 if (msg_type(hdr) != STATE_MSG) {
505 tipc_link_bc_init_rcv(l, hdr);
506 } else if (!msg_bc_ack_invalid(hdr)) {
507 tipc_get_gap_ack_blks(&ga, l, hdr, false);
508 if (!sysctl_tipc_bc_retruni)
510 rc = tipc_link_bc_ack_rcv(l, msg_bcast_ack(hdr),
511 msg_bc_gap(hdr), ga, &xmitq,
513 rc |= tipc_link_bc_sync_rcv(l, hdr, &xmitq);
515 tipc_bcast_unlock(net);
517 tipc_bcbase_xmit(net, &xmitq);
519 /* Any socket wakeup messages ? */
520 if (!skb_queue_empty(inputq))
521 tipc_sk_rcv(net, inputq);
525 /* tipc_bcast_add_peer - add a peer node to broadcast link and bearer
527 * RCU is locked, node lock is set
529 void tipc_bcast_add_peer(struct net *net, struct tipc_link *uc_l,
530 struct sk_buff_head *xmitq)
532 struct tipc_link *snd_l = tipc_bc_sndlink(net);
534 tipc_bcast_lock(net);
535 tipc_link_add_bc_peer(snd_l, uc_l, xmitq);
536 tipc_bcbase_select_primary(net);
537 tipc_bcbase_calc_bc_threshold(net);
538 tipc_bcast_unlock(net);
541 /* tipc_bcast_remove_peer - remove a peer node from broadcast link and bearer
543 * RCU is locked, node lock is set
545 void tipc_bcast_remove_peer(struct net *net, struct tipc_link *rcv_l)
547 struct tipc_link *snd_l = tipc_bc_sndlink(net);
548 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
549 struct sk_buff_head xmitq;
551 __skb_queue_head_init(&xmitq);
553 tipc_bcast_lock(net);
554 tipc_link_remove_bc_peer(snd_l, rcv_l, &xmitq);
555 tipc_bcbase_select_primary(net);
556 tipc_bcbase_calc_bc_threshold(net);
557 tipc_bcast_unlock(net);
559 tipc_bcbase_xmit(net, &xmitq);
561 /* Any socket wakeup messages ? */
562 if (!skb_queue_empty(inputq))
563 tipc_sk_rcv(net, inputq);
566 int tipc_bclink_reset_stats(struct net *net, struct tipc_link *l)
571 tipc_bcast_lock(net);
572 tipc_link_reset_stats(l);
573 tipc_bcast_unlock(net);
577 static int tipc_bc_link_set_queue_limits(struct net *net, u32 max_win)
579 struct tipc_link *l = tipc_bc_sndlink(net);
583 if (max_win < BCLINK_WIN_MIN)
584 max_win = BCLINK_WIN_MIN;
585 if (max_win > TIPC_MAX_LINK_WIN)
587 tipc_bcast_lock(net);
588 tipc_link_set_queue_limits(l, BCLINK_WIN_MIN, max_win);
589 tipc_bcast_unlock(net);
593 static int tipc_bc_link_set_broadcast_mode(struct net *net, u32 bc_mode)
595 struct tipc_bc_base *bb = tipc_bc_base(net);
598 case BCLINK_MODE_BCAST:
599 if (!bb->bcast_support)
602 bb->force_bcast = true;
603 bb->force_rcast = false;
605 case BCLINK_MODE_RCAST:
606 if (!bb->rcast_support)
609 bb->force_bcast = false;
610 bb->force_rcast = true;
612 case BCLINK_MODE_SEL:
613 if (!bb->bcast_support || !bb->rcast_support)
616 bb->force_bcast = false;
617 bb->force_rcast = false;
626 static int tipc_bc_link_set_broadcast_ratio(struct net *net, u32 bc_ratio)
628 struct tipc_bc_base *bb = tipc_bc_base(net);
630 if (!bb->bcast_support || !bb->rcast_support)
633 if (bc_ratio > 100 || bc_ratio <= 0)
636 bb->rc_ratio = bc_ratio;
637 tipc_bcast_lock(net);
638 tipc_bcbase_calc_bc_threshold(net);
639 tipc_bcast_unlock(net);
644 int tipc_nl_bc_link_set(struct net *net, struct nlattr *attrs[])
650 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
652 if (!attrs[TIPC_NLA_LINK_PROP])
655 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
659 if (!props[TIPC_NLA_PROP_WIN] &&
660 !props[TIPC_NLA_PROP_BROADCAST] &&
661 !props[TIPC_NLA_PROP_BROADCAST_RATIO]) {
665 if (props[TIPC_NLA_PROP_BROADCAST]) {
666 bc_mode = nla_get_u32(props[TIPC_NLA_PROP_BROADCAST]);
667 err = tipc_bc_link_set_broadcast_mode(net, bc_mode);
670 if (!err && props[TIPC_NLA_PROP_BROADCAST_RATIO]) {
671 bc_ratio = nla_get_u32(props[TIPC_NLA_PROP_BROADCAST_RATIO]);
672 err = tipc_bc_link_set_broadcast_ratio(net, bc_ratio);
675 if (!err && props[TIPC_NLA_PROP_WIN]) {
676 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
677 err = tipc_bc_link_set_queue_limits(net, win);
683 int tipc_bcast_init(struct net *net)
685 struct tipc_net *tn = tipc_net(net);
686 struct tipc_bc_base *bb = NULL;
687 struct tipc_link *l = NULL;
689 bb = kzalloc(sizeof(*bb), GFP_KERNEL);
693 spin_lock_init(&tipc_net(net)->bclock);
695 if (!tipc_link_bc_create(net, 0, 0, NULL,
708 bb->rcast_support = true;
716 void tipc_bcast_stop(struct net *net)
718 struct tipc_net *tn = net_generic(net, tipc_net_id);
725 void tipc_nlist_init(struct tipc_nlist *nl, u32 self)
727 memset(nl, 0, sizeof(*nl));
728 INIT_LIST_HEAD(&nl->list);
732 void tipc_nlist_add(struct tipc_nlist *nl, u32 node)
734 if (node == nl->self)
736 else if (tipc_dest_push(&nl->list, node, 0))
740 void tipc_nlist_del(struct tipc_nlist *nl, u32 node)
742 if (node == nl->self)
744 else if (tipc_dest_del(&nl->list, node, 0))
748 void tipc_nlist_purge(struct tipc_nlist *nl)
750 tipc_dest_list_purge(&nl->list);
755 u32 tipc_bcast_get_broadcast_mode(struct net *net)
757 struct tipc_bc_base *bb = tipc_bc_base(net);
760 return BCLINK_MODE_BCAST;
763 return BCLINK_MODE_RCAST;
765 if (bb->bcast_support && bb->rcast_support)
766 return BCLINK_MODE_SEL;
771 u32 tipc_bcast_get_broadcast_ratio(struct net *net)
773 struct tipc_bc_base *bb = tipc_bc_base(net);
778 void tipc_mcast_filter_msg(struct net *net, struct sk_buff_head *defq,
779 struct sk_buff_head *inputq)
781 struct sk_buff *skb, *_skb, *tmp;
782 struct tipc_msg *hdr, *_hdr;
786 skb = skb_peek(inputq);
792 if (likely(!msg_is_syn(hdr) && skb_queue_empty(defq)))
795 node = msg_orignode(hdr);
796 if (node == tipc_own_addr(net))
799 port = msg_origport(hdr);
801 /* Has the twin SYN message already arrived ? */
802 skb_queue_walk(defq, _skb) {
803 _hdr = buf_msg(_skb);
804 if (msg_orignode(_hdr) != node)
806 if (msg_origport(_hdr) != port)
813 if (!msg_is_syn(hdr))
815 __skb_dequeue(inputq);
816 __skb_queue_tail(defq, skb);
820 /* Deliver non-SYN message from other link, otherwise queue it */
821 if (!msg_is_syn(hdr)) {
822 if (msg_is_rcast(hdr) != msg_is_rcast(_hdr))
824 __skb_dequeue(inputq);
825 __skb_queue_tail(defq, skb);
829 /* Queue non-SYN/SYN message from same link */
830 if (msg_is_rcast(hdr) == msg_is_rcast(_hdr)) {
831 __skb_dequeue(inputq);
832 __skb_queue_tail(defq, skb);
836 /* Matching SYN messages => return the one with data, if any */
837 __skb_unlink(_skb, defq);
838 if (msg_data_sz(hdr)) {
841 __skb_dequeue(inputq);
843 __skb_queue_tail(inputq, _skb);
846 /* Deliver subsequent non-SYN messages from same peer */
847 skb_queue_walk_safe(defq, _skb, tmp) {
848 _hdr = buf_msg(_skb);
849 if (msg_orignode(_hdr) != node)
851 if (msg_origport(_hdr) != port)
853 if (msg_is_syn(_hdr))
855 __skb_unlink(_skb, defq);
856 __skb_queue_tail(inputq, _skb);