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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/bcast.c: TIPC broadcast code
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Jon Maloy4c94cc22017-11-30 16:47:25 +01004 * Copyright (c) 2004-2006, 2014-2017, Ericsson AB
Per Lidenb97bf3f2006-01-02 19:04:38 +01005 * Copyright (c) 2004, Intel Corporation.
Allan Stephens2d627b92011-01-07 13:00:11 -05006 * Copyright (c) 2005, 2010-2011, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01007 * All rights reserved.
8 *
Per Liden9ea1fd32006-01-11 13:30:43 +01009 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +010010 * modification, are permitted provided that the following conditions are met:
11 *
Per Liden9ea1fd32006-01-11 13:30:43 +010012 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010020 *
Per Liden9ea1fd32006-01-11 13:30:43 +010021 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010035 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -040038#include <linux/tipc_config.h>
Jon Paul Maloy078bec82014-07-16 20:41:00 -040039#include "socket.h"
40#include "msg.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010041#include "bcast.h"
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -040042#include "link.h"
Jon Paul Maloy2ae0b8a2017-01-18 13:50:51 -050043#include "name_table.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010044
Jon Maloy4c94cc22017-11-30 16:47:25 +010045#define BCLINK_WIN_DEFAULT 50 /* bcast link window size (default) */
46#define BCLINK_WIN_MIN 32 /* bcast minimum link window size */
Allan Stephensc47e9b92011-10-24 10:29:26 -040047
Allan Stephens3aec9cc2010-05-11 14:30:07 +000048const char tipc_bclink_name[] = "broadcast-link";
Per Lidenb97bf3f2006-01-02 19:04:38 +010049
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -040050/**
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -040051 * struct tipc_bc_base - base structure for keeping broadcast send state
Jon Paul Maloyb06b2812015-10-22 08:51:42 -040052 * @link: broadcast send link structure
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -040053 * @inputq: data input queue; will only carry SOCK_WAKEUP messages
Zhenbo Gao9cc1bf32018-09-03 16:36:45 +080054 * @dests: array keeping number of reachable destinations per bearer
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -040055 * @primary_bearer: a bearer having links to all broadcast destinations, if any
Jon Paul Maloy99999742017-01-18 13:50:50 -050056 * @bcast_support: indicates if primary bearer, if any, supports broadcast
Hoang Le02ec6ca2019-03-19 18:49:48 +070057 * @force_bcast: forces broadcast for multicast traffic
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -050058 * @rcast_support: indicates if all peer nodes support replicast
Hoang Le02ec6ca2019-03-19 18:49:48 +070059 * @force_rcast: forces replicast for multicast traffic
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -050060 * @rc_ratio: dest count as percentage of cluster size where send method changes
Zhenbo Gao9cc1bf32018-09-03 16:36:45 +080061 * @bc_threshold: calculated from rc_ratio; if dests > threshold use broadcast
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -040062 */
63struct tipc_bc_base {
Jon Paul Maloy32301902015-10-22 08:51:37 -040064 struct tipc_link *link;
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -040065 struct sk_buff_head inputq;
Jon Paul Maloyb06b2812015-10-22 08:51:42 -040066 int dests[MAX_BEARERS];
67 int primary_bearer;
Jon Paul Maloy99999742017-01-18 13:50:50 -050068 bool bcast_support;
Hoang Le02ec6ca2019-03-19 18:49:48 +070069 bool force_bcast;
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -050070 bool rcast_support;
Hoang Le02ec6ca2019-03-19 18:49:48 +070071 bool force_rcast;
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -050072 int rc_ratio;
73 int bc_threshold;
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -040074};
75
Jon Paul Maloy5fd9fd62015-10-22 08:51:35 -040076static struct tipc_bc_base *tipc_bc_base(struct net *net)
77{
78 return tipc_net(net)->bcbase;
79}
80
Jon Maloy4c94cc22017-11-30 16:47:25 +010081/* 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
84 */
Jon Paul Maloy959e1782015-10-22 08:51:43 -040085int tipc_bcast_get_mtu(struct net *net)
Jon Paul Maloy078bec82014-07-16 20:41:00 -040086{
Tuong Lienfc1b6d62019-11-08 12:05:11 +070087 return tipc_link_mss(tipc_bc_sndlink(net));
Jon Paul Maloy078bec82014-07-16 20:41:00 -040088}
89
Hoang Leba5f6a82019-11-21 10:01:09 +070090void tipc_bcast_toggle_rcast(struct net *net, bool supp)
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -050091{
Hoang Leba5f6a82019-11-21 10:01:09 +070092 tipc_bc_base(net)->rcast_support = supp;
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -050093}
94
95static void tipc_bcbase_calc_bc_threshold(struct net *net)
96{
97 struct tipc_bc_base *bb = tipc_bc_base(net);
98 int cluster_size = tipc_link_bc_peers(tipc_bc_sndlink(net));
99
100 bb->bc_threshold = 1 + (cluster_size * bb->rc_ratio / 100);
101}
102
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400103/* tipc_bcbase_select_primary(): find a bearer with links to all destinations,
104 * if any, and make it primary bearer
105 */
106static void tipc_bcbase_select_primary(struct net *net)
107{
108 struct tipc_bc_base *bb = tipc_bc_base(net);
109 int all_dests = tipc_link_bc_peers(bb->link);
Jon Paul Maloy99999742017-01-18 13:50:50 -0500110 int i, mtu, prim;
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400111
112 bb->primary_bearer = INVALID_BEARER_ID;
Jon Paul Maloy99999742017-01-18 13:50:50 -0500113 bb->bcast_support = true;
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400114
115 if (!all_dests)
116 return;
117
118 for (i = 0; i < MAX_BEARERS; i++) {
Jon Paul Maloy959e1782015-10-22 08:51:43 -0400119 if (!bb->dests[i])
120 continue;
121
122 mtu = tipc_bearer_mtu(net, i);
123 if (mtu < tipc_link_mtu(bb->link))
124 tipc_link_set_mtu(bb->link, mtu);
Jon Paul Maloy99999742017-01-18 13:50:50 -0500125 bb->bcast_support &= tipc_bearer_bcast_support(net, i);
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400126 if (bb->dests[i] < all_dests)
127 continue;
128
129 bb->primary_bearer = i;
130
131 /* Reduce risk that all nodes select same primary */
132 if ((i ^ tipc_own_addr(net)) & 1)
133 break;
134 }
Jon Paul Maloy99999742017-01-18 13:50:50 -0500135 prim = bb->primary_bearer;
136 if (prim != INVALID_BEARER_ID)
137 bb->bcast_support = tipc_bearer_bcast_support(net, prim);
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400138}
139
140void tipc_bcast_inc_bearer_dst_cnt(struct net *net, int bearer_id)
141{
142 struct tipc_bc_base *bb = tipc_bc_base(net);
143
144 tipc_bcast_lock(net);
145 bb->dests[bearer_id]++;
146 tipc_bcbase_select_primary(net);
147 tipc_bcast_unlock(net);
148}
149
150void tipc_bcast_dec_bearer_dst_cnt(struct net *net, int bearer_id)
151{
152 struct tipc_bc_base *bb = tipc_bc_base(net);
153
154 tipc_bcast_lock(net);
155 bb->dests[bearer_id]--;
156 tipc_bcbase_select_primary(net);
157 tipc_bcast_unlock(net);
158}
159
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400160/* tipc_bcbase_xmit - broadcast a packet queue across one or more bearers
161 *
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
168 * just went down)
169 */
170static void tipc_bcbase_xmit(struct net *net, struct sk_buff_head *xmitq)
171{
172 int bearer_id;
173 struct tipc_bc_base *bb = tipc_bc_base(net);
174 struct sk_buff *skb, *_skb;
175 struct sk_buff_head _xmitq;
176
177 if (skb_queue_empty(xmitq))
178 return;
179
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);
184 return;
185 }
186
187 /* We have to transmit across all bearers */
Jon Maloye654f9f2019-08-15 16:42:50 +0200188 __skb_queue_head_init(&_xmitq);
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400189 for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
190 if (!bb->dests[bearer_id])
191 continue;
192
193 skb_queue_walk(xmitq, skb) {
194 _skb = pskb_copy_for_clone(skb, GFP_ATOMIC);
195 if (!_skb)
196 break;
197 __skb_queue_tail(&_xmitq, _skb);
198 }
199 tipc_bearer_bc_xmit(net, bearer_id, &_xmitq);
200 }
201 __skb_queue_purge(xmitq);
202 __skb_queue_purge(&_xmitq);
203}
204
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500205static void tipc_bcast_select_xmit_method(struct net *net, int dests,
206 struct tipc_mc_method *method)
207{
208 struct tipc_bc_base *bb = tipc_bc_base(net);
209 unsigned long exp = method->expires;
210
211 /* Broadcast supported by used bearer/bearers? */
212 if (!bb->bcast_support) {
213 method->rcast = true;
214 return;
215 }
216 /* Any destinations which don't support replicast ? */
217 if (!bb->rcast_support) {
218 method->rcast = false;
219 return;
220 }
221 /* Can current method be changed ? */
222 method->expires = jiffies + TIPC_METHOD_EXPIRE;
Hoang Lec55c8ed2019-03-19 18:49:50 +0700223 if (method->mandatory)
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500224 return;
225
Hoang Lec55c8ed2019-03-19 18:49:50 +0700226 if (!(tipc_net(net)->capabilities & TIPC_MCAST_RBCTL) &&
227 time_before(jiffies, exp))
228 return;
229
230 /* Configuration as force 'broadcast' method */
231 if (bb->force_bcast) {
232 method->rcast = false;
233 return;
234 }
235 /* Configuration as force 'replicast' method */
236 if (bb->force_rcast) {
237 method->rcast = true;
238 return;
239 }
240 /* Configuration as 'autoselect' or default method */
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500241 /* Determine method to use now */
242 method->rcast = dests <= bb->bc_threshold;
243}
244
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500245/* tipc_bcast_xmit - broadcast the buffer chain to all external nodes
Ying Xuef2f98002015-01-09 15:27:05 +0800246 * @net: the applicable net namespace
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500247 * @pkts: chain of buffers containing message
248 * @cong_link_cnt: set to 1 if broadcast link is congested, otherwise 0
Jon Paul Maloy365ad352017-01-03 10:55:11 -0500249 * Consumes the buffer chain.
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500250 * Returns 0 if success, otherwise errno: -EHOSTUNREACH,-EMSGSIZE
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400251 */
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500252static int tipc_bcast_xmit(struct net *net, struct sk_buff_head *pkts,
253 u16 *cong_link_cnt)
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400254{
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400255 struct tipc_link *l = tipc_bc_sndlink(net);
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500256 struct sk_buff_head xmitq;
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400257 int rc = 0;
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400258
Jon Maloye654f9f2019-08-15 16:42:50 +0200259 __skb_queue_head_init(&xmitq);
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400260 tipc_bcast_lock(net);
261 if (tipc_link_bc_peers(l))
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500262 rc = tipc_link_xmit(l, pkts, &xmitq);
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400263 tipc_bcast_unlock(net);
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500264 tipc_bcbase_xmit(net, &xmitq);
265 __skb_queue_purge(pkts);
266 if (rc == -ELINKCONG) {
267 *cong_link_cnt = 1;
268 rc = 0;
269 }
270 return rc;
271}
Ying Xue58dc55f2014-11-26 11:41:52 +0800272
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500273/* 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
280 */
281static int tipc_rcast_xmit(struct net *net, struct sk_buff_head *pkts,
282 struct tipc_nlist *dests, u16 *cong_link_cnt)
283{
Jon Maloya80ae532017-10-13 11:04:22 +0200284 struct tipc_dest *dst, *tmp;
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500285 struct sk_buff_head _pkts;
Jon Maloya80ae532017-10-13 11:04:22 +0200286 u32 dnode, selector;
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500287
288 selector = msg_link_selector(buf_msg(skb_peek(pkts)));
Jon Maloye654f9f2019-08-15 16:42:50 +0200289 __skb_queue_head_init(&_pkts);
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500290
Jon Maloya80ae532017-10-13 11:04:22 +0200291 list_for_each_entry_safe(dst, tmp, &dests->list, list) {
292 dnode = dst->node;
293 if (!tipc_msg_pskb_copy(dnode, pkts, &_pkts))
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500294 return -ENOMEM;
295
296 /* Any other return value than -ELINKCONG is ignored */
Jon Maloya80ae532017-10-13 11:04:22 +0200297 if (tipc_node_xmit(net, &_pkts, dnode, selector) == -ELINKCONG)
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500298 (*cong_link_cnt)++;
299 }
300 return 0;
301}
302
Hoang Lec55c8ed2019-03-19 18:49:50 +0700303/* 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
310 */
311static int tipc_mcast_send_sync(struct net *net, struct sk_buff *skb,
312 struct tipc_mc_method *method,
313 struct tipc_nlist *dests,
314 u16 *cong_link_cnt)
315{
316 struct tipc_msg *hdr, *_hdr;
317 struct sk_buff_head tmpq;
318 struct sk_buff *_skb;
319
320 /* Is a cluster supporting with new capabilities ? */
321 if (!(tipc_net(net)->capabilities & TIPC_MCAST_RBCTL))
322 return 0;
323
324 hdr = buf_msg(skb);
325 if (msg_user(hdr) == MSG_FRAGMENTER)
Jon Maloya7dc51a2019-06-25 19:37:00 +0200326 hdr = msg_inner_hdr(hdr);
Hoang Lec55c8ed2019-03-19 18:49:50 +0700327 if (msg_type(hdr) != TIPC_MCAST_MSG)
328 return 0;
329
330 /* Allocate dummy message */
331 _skb = tipc_buf_acquire(MCAST_H_SIZE, GFP_KERNEL);
Wei Yongjun6da88a82019-03-25 06:31:09 +0000332 if (!_skb)
Hoang Lec55c8ed2019-03-19 18:49:50 +0700333 return -ENOMEM;
334
335 /* Preparing for 'synching' header */
336 msg_set_syn(hdr, 1);
337
338 /* Copy skb's header into a dummy header */
339 skb_copy_to_linear_data(_skb, hdr, MCAST_H_SIZE);
340 skb_orphan(_skb);
341
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));
346
Jon Maloye654f9f2019-08-15 16:42:50 +0200347 __skb_queue_head_init(&tmpq);
Hoang Lec55c8ed2019-03-19 18:49:50 +0700348 __skb_queue_tail(&tmpq, _skb);
349 if (method->rcast)
350 tipc_bcast_xmit(net, &tmpq, cong_link_cnt);
351 else
352 tipc_rcast_xmit(net, &tmpq, dests, cong_link_cnt);
353
354 /* This queue should normally be empty by now */
355 __skb_queue_purge(&tmpq);
356
357 return 0;
358}
359
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500360/* 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
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500364 * @method: send method to be used
365 * @dests: destination nodes for message.
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500366 * @cong_link_cnt: returns number of encountered congested destination links
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500367 * Consumes buffer chain.
368 * Returns 0 if success, otherwise errno
369 */
370int tipc_mcast_xmit(struct net *net, struct sk_buff_head *pkts,
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500371 struct tipc_mc_method *method, struct tipc_nlist *dests,
372 u16 *cong_link_cnt)
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500373{
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500374 struct sk_buff_head inputq, localq;
Hoang Lec55c8ed2019-03-19 18:49:50 +0700375 bool rcast = method->rcast;
376 struct tipc_msg *hdr;
377 struct sk_buff *skb;
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500378 int rc = 0;
379
380 skb_queue_head_init(&inputq);
Jon Maloye654f9f2019-08-15 16:42:50 +0200381 __skb_queue_head_init(&localq);
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500382
383 /* Clone packets before they are consumed by next call */
384 if (dests->local && !tipc_msg_reassemble(pkts, &localq)) {
385 rc = -ENOMEM;
386 goto exit;
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500387 }
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500388 /* Send according to determined transmit method */
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500389 if (dests->remote) {
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500390 tipc_bcast_select_xmit_method(net, dests->remote, method);
Hoang Lec55c8ed2019-03-19 18:49:50 +0700391
392 skb = skb_peek(pkts);
393 hdr = buf_msg(skb);
394 if (msg_user(hdr) == MSG_FRAGMENTER)
Jon Maloya7dc51a2019-06-25 19:37:00 +0200395 hdr = msg_inner_hdr(hdr);
Hoang Lec55c8ed2019-03-19 18:49:50 +0700396 msg_set_is_rcast(hdr, method->rcast);
397
398 /* Switch method ? */
399 if (rcast != method->rcast)
400 tipc_mcast_send_sync(net, skb, method,
401 dests, cong_link_cnt);
402
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500403 if (method->rcast)
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500404 rc = tipc_rcast_xmit(net, pkts, dests, cong_link_cnt);
405 else
406 rc = tipc_bcast_xmit(net, pkts, cong_link_cnt);
407 }
408
John Rutherford6c9081a2019-08-07 12:52:29 +1000409 if (dests->local) {
410 tipc_loopback_trace(net, &localq);
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500411 tipc_sk_mcast_rcv(net, &localq, &inputq);
John Rutherford6c9081a2019-08-07 12:52:29 +1000412 }
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500413exit:
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500414 /* This queue should normally be empty by now */
Jon Paul Maloya853e4c2017-01-18 13:50:52 -0500415 __skb_queue_purge(pkts);
Jon Paul Maloy365ad352017-01-03 10:55:11 -0500416 return rc;
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400417}
Jon Paul Maloy52666982015-10-22 08:51:41 -0400418
419/* tipc_bcast_rcv - receive a broadcast packet, and deliver to rcv link
420 *
421 * RCU is locked, no other locks set
422 */
423int tipc_bcast_rcv(struct net *net, struct tipc_link *l, struct sk_buff *skb)
424{
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;
428 int rc;
429
430 __skb_queue_head_init(&xmitq);
431
432 if (msg_mc_netid(hdr) != tipc_netid(net) || !tipc_link_is_up(l)) {
433 kfree_skb(skb);
434 return 0;
435 }
436
437 tipc_bcast_lock(net);
438 if (msg_user(hdr) == BCAST_PROTOCOL)
439 rc = tipc_link_bc_nack_rcv(l, skb, &xmitq);
440 else
441 rc = tipc_link_rcv(l, skb, NULL);
442 tipc_bcast_unlock(net);
443
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400444 tipc_bcbase_xmit(net, &xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400445
446 /* Any socket wakeup messages ? */
447 if (!skb_queue_empty(inputq))
448 tipc_sk_rcv(net, inputq);
449
450 return rc;
451}
452
453/* tipc_bcast_ack_rcv - receive and handle a broadcast acknowledge
454 *
455 * RCU is locked, no other locks set
456 */
Jon Paul Maloy06bd2b12016-10-27 18:51:55 -0400457void tipc_bcast_ack_rcv(struct net *net, struct tipc_link *l,
458 struct tipc_msg *hdr)
Jon Paul Maloy52666982015-10-22 08:51:41 -0400459{
460 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
Jon Paul Maloy06bd2b12016-10-27 18:51:55 -0400461 u16 acked = msg_bcast_ack(hdr);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400462 struct sk_buff_head xmitq;
463
Jon Paul Maloy06bd2b12016-10-27 18:51:55 -0400464 /* Ignore bc acks sent by peer before bcast synch point was received */
465 if (msg_bc_ack_invalid(hdr))
466 return;
467
Jon Paul Maloy52666982015-10-22 08:51:41 -0400468 __skb_queue_head_init(&xmitq);
469
470 tipc_bcast_lock(net);
471 tipc_link_bc_ack_rcv(l, acked, &xmitq);
472 tipc_bcast_unlock(net);
473
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400474 tipc_bcbase_xmit(net, &xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400475
476 /* Any socket wakeup messages ? */
477 if (!skb_queue_empty(inputq))
478 tipc_sk_rcv(net, inputq);
479}
480
481/* tipc_bcast_synch_rcv - check and update rcv link with peer's send state
482 *
483 * RCU is locked, no other locks set
484 */
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -0400485int tipc_bcast_sync_rcv(struct net *net, struct tipc_link *l,
486 struct tipc_msg *hdr)
Jon Paul Maloy52666982015-10-22 08:51:41 -0400487{
488 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
489 struct sk_buff_head xmitq;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -0400490 int rc = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400491
492 __skb_queue_head_init(&xmitq);
493
494 tipc_bcast_lock(net);
Jon Paul Maloy06bd2b12016-10-27 18:51:55 -0400495 if (msg_type(hdr) != STATE_MSG) {
496 tipc_link_bc_init_rcv(l, hdr);
497 } else if (!msg_bc_ack_invalid(hdr)) {
Jon Paul Maloy52666982015-10-22 08:51:41 -0400498 tipc_link_bc_ack_rcv(l, msg_bcast_ack(hdr), &xmitq);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -0400499 rc = tipc_link_bc_sync_rcv(l, hdr, &xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400500 }
501 tipc_bcast_unlock(net);
502
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400503 tipc_bcbase_xmit(net, &xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400504
505 /* Any socket wakeup messages ? */
506 if (!skb_queue_empty(inputq))
507 tipc_sk_rcv(net, inputq);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -0400508 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400509}
510
511/* tipc_bcast_add_peer - add a peer node to broadcast link and bearer
512 *
513 * RCU is locked, node lock is set
514 */
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400515void tipc_bcast_add_peer(struct net *net, struct tipc_link *uc_l,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400516 struct sk_buff_head *xmitq)
517{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400518 struct tipc_link *snd_l = tipc_bc_sndlink(net);
519
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400520 tipc_bcast_lock(net);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400521 tipc_link_add_bc_peer(snd_l, uc_l, xmitq);
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400522 tipc_bcbase_select_primary(net);
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500523 tipc_bcbase_calc_bc_threshold(net);
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400524 tipc_bcast_unlock(net);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400525}
526
527/* tipc_bcast_remove_peer - remove a peer node from broadcast link and bearer
528 *
529 * RCU is locked, node lock is set
530 */
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400531void tipc_bcast_remove_peer(struct net *net, struct tipc_link *rcv_l)
Jon Paul Maloy52666982015-10-22 08:51:41 -0400532{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400533 struct tipc_link *snd_l = tipc_bc_sndlink(net);
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400534 struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400535 struct sk_buff_head xmitq;
536
537 __skb_queue_head_init(&xmitq);
538
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400539 tipc_bcast_lock(net);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400540 tipc_link_remove_bc_peer(snd_l, rcv_l, &xmitq);
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400541 tipc_bcbase_select_primary(net);
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500542 tipc_bcbase_calc_bc_threshold(net);
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400543 tipc_bcast_unlock(net);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400544
Jon Paul Maloyb06b2812015-10-22 08:51:42 -0400545 tipc_bcbase_xmit(net, &xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400546
547 /* Any socket wakeup messages ? */
548 if (!skb_queue_empty(inputq))
549 tipc_sk_rcv(net, inputq);
550}
551
Ying Xue1da46562015-01-09 15:27:07 +0800552int tipc_bclink_reset_stats(struct net *net)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100553{
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500554 struct tipc_link *l = tipc_bc_sndlink(net);
Ying Xue1da46562015-01-09 15:27:07 +0800555
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500556 if (!l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100557 return -ENOPROTOOPT;
558
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400559 tipc_bcast_lock(net);
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500560 tipc_link_reset_stats(l);
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400561 tipc_bcast_unlock(net);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700562 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100563}
564
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400565static int tipc_bc_link_set_queue_limits(struct net *net, u32 limit)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100566{
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400567 struct tipc_link *l = tipc_bc_sndlink(net);
Ying Xue1da46562015-01-09 15:27:07 +0800568
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400569 if (!l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100570 return -ENOPROTOOPT;
Jon Paul Maloy53387c42015-10-19 09:21:37 -0400571 if (limit < BCLINK_WIN_MIN)
572 limit = BCLINK_WIN_MIN;
573 if (limit > TIPC_MAX_LINK_WIN)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100574 return -EINVAL;
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400575 tipc_bcast_lock(net);
576 tipc_link_set_queue_limits(l, limit);
577 tipc_bcast_unlock(net);
Allan Stephens0e35fd52008-07-14 22:44:01 -0700578 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100579}
580
Hoang Le02ec6ca2019-03-19 18:49:48 +0700581static int tipc_bc_link_set_broadcast_mode(struct net *net, u32 bc_mode)
582{
583 struct tipc_bc_base *bb = tipc_bc_base(net);
584
585 switch (bc_mode) {
586 case BCLINK_MODE_BCAST:
587 if (!bb->bcast_support)
588 return -ENOPROTOOPT;
589
590 bb->force_bcast = true;
591 bb->force_rcast = false;
592 break;
593 case BCLINK_MODE_RCAST:
594 if (!bb->rcast_support)
595 return -ENOPROTOOPT;
596
597 bb->force_bcast = false;
598 bb->force_rcast = true;
599 break;
600 case BCLINK_MODE_SEL:
601 if (!bb->bcast_support || !bb->rcast_support)
602 return -ENOPROTOOPT;
603
604 bb->force_bcast = false;
605 bb->force_rcast = false;
606 break;
607 default:
608 return -EINVAL;
609 }
610
611 return 0;
612}
613
614static int tipc_bc_link_set_broadcast_ratio(struct net *net, u32 bc_ratio)
615{
616 struct tipc_bc_base *bb = tipc_bc_base(net);
617
618 if (!bb->bcast_support || !bb->rcast_support)
619 return -ENOPROTOOPT;
620
621 if (bc_ratio > 100 || bc_ratio <= 0)
622 return -EINVAL;
623
624 bb->rc_ratio = bc_ratio;
625 tipc_bcast_lock(net);
626 tipc_bcbase_calc_bc_threshold(net);
627 tipc_bcast_unlock(net);
628
629 return 0;
630}
631
Richard Alpe670f4f82015-05-06 13:58:55 +0200632int tipc_nl_bc_link_set(struct net *net, struct nlattr *attrs[])
633{
634 int err;
635 u32 win;
Hoang Le02ec6ca2019-03-19 18:49:48 +0700636 u32 bc_mode;
637 u32 bc_ratio;
Richard Alpe670f4f82015-05-06 13:58:55 +0200638 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
639
640 if (!attrs[TIPC_NLA_LINK_PROP])
641 return -EINVAL;
642
643 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props);
644 if (err)
645 return err;
646
Hoang Le02ec6ca2019-03-19 18:49:48 +0700647 if (!props[TIPC_NLA_PROP_WIN] &&
648 !props[TIPC_NLA_PROP_BROADCAST] &&
649 !props[TIPC_NLA_PROP_BROADCAST_RATIO]) {
Richard Alpe670f4f82015-05-06 13:58:55 +0200650 return -EOPNOTSUPP;
Hoang Le02ec6ca2019-03-19 18:49:48 +0700651 }
Richard Alpe670f4f82015-05-06 13:58:55 +0200652
Hoang Le02ec6ca2019-03-19 18:49:48 +0700653 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);
656 }
Richard Alpe670f4f82015-05-06 13:58:55 +0200657
Hoang Le02ec6ca2019-03-19 18:49:48 +0700658 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);
661 }
662
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);
666 }
667
668 return err;
Richard Alpe670f4f82015-05-06 13:58:55 +0200669}
670
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -0400671int tipc_bcast_init(struct net *net)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100672{
Jon Paul Maloy32301902015-10-22 08:51:37 -0400673 struct tipc_net *tn = tipc_net(net);
Jon Paul Maloy32301902015-10-22 08:51:37 -0400674 struct tipc_bc_base *bb = NULL;
675 struct tipc_link *l = NULL;
Ying Xue7f9f95d2015-01-09 15:27:06 +0800676
Jia-Ju Baia0732542018-07-27 17:31:35 +0800677 bb = kzalloc(sizeof(*bb), GFP_KERNEL);
Jon Paul Maloy32301902015-10-22 08:51:37 -0400678 if (!bb)
679 goto enomem;
680 tn->bcbase = bb;
Jon Paul Maloy00435502015-10-22 08:51:34 -0400681 spin_lock_init(&tipc_net(net)->bclock);
Jon Paul Maloy5fd9fd62015-10-22 08:51:35 -0400682
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400683 if (!tipc_link_bc_create(net, 0, 0,
Jon Maloy4c94cc22017-11-30 16:47:25 +0100684 FB_MTU,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400685 BCLINK_WIN_DEFAULT,
Jon Paul Maloyfd556f22015-10-22 08:51:40 -0400686 0,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400687 &bb->inputq,
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400688 NULL,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400689 NULL,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400690 &l))
691 goto enomem;
692 bb->link = l;
693 tn->bcl = l;
Hoang Le02ec6ca2019-03-19 18:49:48 +0700694 bb->rc_ratio = 10;
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500695 bb->rcast_support = true;
Ying Xueeb8b00f2014-05-05 08:56:16 +0800696 return 0;
Jon Paul Maloy32301902015-10-22 08:51:37 -0400697enomem:
Jon Paul Maloy32301902015-10-22 08:51:37 -0400698 kfree(bb);
699 kfree(l);
700 return -ENOMEM;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100701}
702
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -0400703void tipc_bcast_stop(struct net *net)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100704{
Ying Xue7f9f95d2015-01-09 15:27:06 +0800705 struct tipc_net *tn = net_generic(net, tipc_net_id);
706
Ying Xueeb8b00f2014-05-05 08:56:16 +0800707 synchronize_net();
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -0400708 kfree(tn->bcbase);
Jon Paul Maloy32301902015-10-22 08:51:37 -0400709 kfree(tn->bcl);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100710}
Jon Paul Maloy2ae0b8a2017-01-18 13:50:51 -0500711
712void tipc_nlist_init(struct tipc_nlist *nl, u32 self)
713{
714 memset(nl, 0, sizeof(*nl));
715 INIT_LIST_HEAD(&nl->list);
716 nl->self = self;
717}
718
719void tipc_nlist_add(struct tipc_nlist *nl, u32 node)
720{
721 if (node == nl->self)
722 nl->local = true;
Jon Maloya80ae532017-10-13 11:04:22 +0200723 else if (tipc_dest_push(&nl->list, node, 0))
Jon Paul Maloy2ae0b8a2017-01-18 13:50:51 -0500724 nl->remote++;
725}
726
727void tipc_nlist_del(struct tipc_nlist *nl, u32 node)
728{
729 if (node == nl->self)
730 nl->local = false;
Jon Maloya80ae532017-10-13 11:04:22 +0200731 else if (tipc_dest_del(&nl->list, node, 0))
Jon Paul Maloy2ae0b8a2017-01-18 13:50:51 -0500732 nl->remote--;
733}
734
735void tipc_nlist_purge(struct tipc_nlist *nl)
736{
Jon Maloya80ae532017-10-13 11:04:22 +0200737 tipc_dest_list_purge(&nl->list);
Jon Paul Maloy2ae0b8a2017-01-18 13:50:51 -0500738 nl->remote = 0;
Gustavo A. R. Silvac9efb152018-03-05 15:56:14 -0600739 nl->local = false;
Jon Paul Maloy2ae0b8a2017-01-18 13:50:51 -0500740}
Hoang Le02ec6ca2019-03-19 18:49:48 +0700741
742u32 tipc_bcast_get_broadcast_mode(struct net *net)
743{
744 struct tipc_bc_base *bb = tipc_bc_base(net);
745
746 if (bb->force_bcast)
747 return BCLINK_MODE_BCAST;
748
749 if (bb->force_rcast)
750 return BCLINK_MODE_RCAST;
751
752 if (bb->bcast_support && bb->rcast_support)
753 return BCLINK_MODE_SEL;
754
755 return 0;
756}
757
758u32 tipc_bcast_get_broadcast_ratio(struct net *net)
759{
760 struct tipc_bc_base *bb = tipc_bc_base(net);
761
762 return bb->rc_ratio;
763}
Hoang Lec55c8ed2019-03-19 18:49:50 +0700764
Hoang Le08e046c2019-03-21 17:25:18 +0700765void tipc_mcast_filter_msg(struct net *net, struct sk_buff_head *defq,
Hoang Lec55c8ed2019-03-19 18:49:50 +0700766 struct sk_buff_head *inputq)
767{
768 struct sk_buff *skb, *_skb, *tmp;
769 struct tipc_msg *hdr, *_hdr;
770 bool match = false;
771 u32 node, port;
772
773 skb = skb_peek(inputq);
Hoang Lee1279ff2019-04-03 13:05:04 +0700774 if (!skb)
775 return;
776
Hoang Lec55c8ed2019-03-19 18:49:50 +0700777 hdr = buf_msg(skb);
778
779 if (likely(!msg_is_syn(hdr) && skb_queue_empty(defq)))
780 return;
781
782 node = msg_orignode(hdr);
Hoang Le08e046c2019-03-21 17:25:18 +0700783 if (node == tipc_own_addr(net))
784 return;
785
Hoang Lec55c8ed2019-03-19 18:49:50 +0700786 port = msg_origport(hdr);
787
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)
792 continue;
793 if (msg_origport(_hdr) != port)
794 continue;
795 match = true;
796 break;
797 }
798
799 if (!match) {
800 if (!msg_is_syn(hdr))
801 return;
802 __skb_dequeue(inputq);
803 __skb_queue_tail(defq, skb);
804 return;
805 }
806
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))
810 return;
811 __skb_dequeue(inputq);
812 __skb_queue_tail(defq, skb);
813 return;
814 }
815
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);
820 return;
821 }
822
823 /* Matching SYN messages => return the one with data, if any */
824 __skb_unlink(_skb, defq);
825 if (msg_data_sz(hdr)) {
826 kfree_skb(_skb);
827 } else {
828 __skb_dequeue(inputq);
829 kfree_skb(skb);
830 __skb_queue_tail(inputq, _skb);
831 }
832
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)
837 continue;
838 if (msg_origport(_hdr) != port)
839 continue;
840 if (msg_is_syn(_hdr))
841 break;
842 __skb_unlink(_skb, defq);
843 __skb_queue_tail(inputq, _skb);
844 }
845}