blob: b8670bf262e249dea10d463fb3b7d2e926ff747e [file] [log] [blame]
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 Paul Maloy078bec82014-07-16 20:41:00 -04004 * Copyright (c) 2004-2006, 2014, 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
38#include "core.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "link.h"
Jon Paul Maloy078bec82014-07-16 20:41:00 -040040#include "socket.h"
41#include "msg.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010042#include "bcast.h"
Allan Stephens9f6bdcd42011-04-07 14:57:53 -040043#include "name_distr.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010044
Ying Xue987b58b2014-03-27 12:54:35 +080045#define MAX_PKT_DEFAULT_MCAST 1500 /* bcast link max packet size (fixed) */
46#define BCLINK_WIN_DEFAULT 20 /* bcast link window size (default) */
47#define BCBEARER MAX_BEARERS
Per Lidenb97bf3f2006-01-02 19:04:38 +010048
Per Lidenb97bf3f2006-01-02 19:04:38 +010049/**
Paul Gortmaker7f9ab6a2011-12-29 20:55:27 -050050 * struct tipc_bcbearer_pair - a pair of bearers used by broadcast link
Per Lidenb97bf3f2006-01-02 19:04:38 +010051 * @primary: pointer to primary bearer
52 * @secondary: pointer to secondary bearer
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090053 *
54 * Bearers must have same priority and same set of reachable destinations
Per Lidenb97bf3f2006-01-02 19:04:38 +010055 * to be paired.
56 */
57
Paul Gortmaker7f9ab6a2011-12-29 20:55:27 -050058struct tipc_bcbearer_pair {
Allan Stephens2d627b92011-01-07 13:00:11 -050059 struct tipc_bearer *primary;
60 struct tipc_bearer *secondary;
Per Lidenb97bf3f2006-01-02 19:04:38 +010061};
62
63/**
Paul Gortmaker7f9ab6a2011-12-29 20:55:27 -050064 * struct tipc_bcbearer - bearer used by broadcast link
Per Lidenb97bf3f2006-01-02 19:04:38 +010065 * @bearer: (non-standard) broadcast bearer structure
66 * @media: (non-standard) broadcast media structure
67 * @bpairs: array of bearer pairs
Allan Stephens65f51ef2006-06-25 23:53:20 -070068 * @bpairs_temp: temporary array of bearer pairs used by tipc_bcbearer_sort()
69 * @remains: temporary node map used by tipc_bcbearer_send()
70 * @remains_new: temporary node map used tipc_bcbearer_send()
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090071 *
Allan Stephens65f51ef2006-06-25 23:53:20 -070072 * Note: The fields labelled "temporary" are incorporated into the bearer
73 * to avoid consuming potentially limited stack space through the use of
74 * large local variables within multicast routines. Concurrent access is
Ying Xued69afc92014-05-05 08:56:15 +080075 * prevented through use of the spinlock "bclink_lock".
Per Lidenb97bf3f2006-01-02 19:04:38 +010076 */
Paul Gortmaker7f9ab6a2011-12-29 20:55:27 -050077struct tipc_bcbearer {
Allan Stephens2d627b92011-01-07 13:00:11 -050078 struct tipc_bearer bearer;
Paul Gortmaker358a0d12011-12-29 20:19:42 -050079 struct tipc_media media;
Paul Gortmaker7f9ab6a2011-12-29 20:55:27 -050080 struct tipc_bcbearer_pair bpairs[MAX_BEARERS];
81 struct tipc_bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1];
David S. Miller6c000552008-09-02 23:38:32 -070082 struct tipc_node_map remains;
83 struct tipc_node_map remains_new;
Per Lidenb97bf3f2006-01-02 19:04:38 +010084};
85
86/**
Paul Gortmaker6765fd62011-12-29 20:52:18 -050087 * struct tipc_bclink - link used for broadcast messages
Ying Xued69afc92014-05-05 08:56:15 +080088 * @lock: spinlock governing access to structure
Per Lidenb97bf3f2006-01-02 19:04:38 +010089 * @link: (non-standard) broadcast link structure
90 * @node: (non-standard) node structure representing b'cast link's peer node
Ying Xue3f5a12b2014-05-05 08:56:17 +080091 * @flags: represent bclink states
Allan Stephenscd3decd2011-10-24 11:18:12 -040092 * @bcast_nodes: map of broadcast-capable nodes
Allan Stephens01d83ed2011-01-18 13:53:16 -050093 * @retransmit_to: node that most recently requested a retransmit
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090094 *
Per Lidenb97bf3f2006-01-02 19:04:38 +010095 * Handles sequence numbering, fragmentation, bundling, etc.
96 */
Paul Gortmaker6765fd62011-12-29 20:52:18 -050097struct tipc_bclink {
Ying Xued69afc92014-05-05 08:56:15 +080098 spinlock_t lock;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -050099 struct tipc_link link;
David S. Miller6c000552008-09-02 23:38:32 -0700100 struct tipc_node node;
Ying Xue3f5a12b2014-05-05 08:56:17 +0800101 unsigned int flags;
Allan Stephenscd3decd2011-10-24 11:18:12 -0400102 struct tipc_node_map bcast_nodes;
Allan Stephens01d83ed2011-01-18 13:53:16 -0500103 struct tipc_node *retransmit_to;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100104};
105
Ying Xueeb8b00f2014-05-05 08:56:16 +0800106static struct tipc_bcbearer *bcbearer;
107static struct tipc_bclink *bclink;
108static struct tipc_link *bcl;
Allan Stephensc47e9b92011-10-24 10:29:26 -0400109
Allan Stephens3aec9cc2010-05-11 14:30:07 +0000110const char tipc_bclink_name[] = "broadcast-link";
Per Lidenb97bf3f2006-01-02 19:04:38 +0100111
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000112static void tipc_nmap_diff(struct tipc_node_map *nm_a,
113 struct tipc_node_map *nm_b,
114 struct tipc_node_map *nm_diff);
Ying Xue28dd9412014-04-21 10:55:51 +0800115static void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node);
116static void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117
Ying Xued69afc92014-05-05 08:56:15 +0800118static void tipc_bclink_lock(void)
119{
120 spin_lock_bh(&bclink->lock);
121}
122
123static void tipc_bclink_unlock(void)
124{
Ying Xue3f5a12b2014-05-05 08:56:17 +0800125 struct tipc_node *node = NULL;
126
127 if (likely(!bclink->flags)) {
128 spin_unlock_bh(&bclink->lock);
129 return;
130 }
131
132 if (bclink->flags & TIPC_BCLINK_RESET) {
133 bclink->flags &= ~TIPC_BCLINK_RESET;
134 node = tipc_bclink_retransmit_to();
135 }
Ying Xued69afc92014-05-05 08:56:15 +0800136 spin_unlock_bh(&bclink->lock);
Ying Xue3f5a12b2014-05-05 08:56:17 +0800137
138 if (node)
139 tipc_link_reset_all(node);
140}
141
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400142uint tipc_bclink_get_mtu(void)
143{
144 return MAX_PKT_DEFAULT_MCAST;
145}
146
Ying Xue3f5a12b2014-05-05 08:56:17 +0800147void tipc_bclink_set_flags(unsigned int flags)
148{
149 bclink->flags |= flags;
Ying Xued69afc92014-05-05 08:56:15 +0800150}
151
Sam Ravnborg05790c62006-03-20 22:37:04 -0800152static u32 bcbuf_acks(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100153{
David S. Miller880b0052006-01-12 13:22:32 -0800154 return (u32)(unsigned long)TIPC_SKB_CB(buf)->handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100155}
156
Sam Ravnborg05790c62006-03-20 22:37:04 -0800157static void bcbuf_set_acks(struct sk_buff *buf, u32 acks)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100158{
David S. Miller880b0052006-01-12 13:22:32 -0800159 TIPC_SKB_CB(buf)->handle = (void *)(unsigned long)acks;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100160}
161
Sam Ravnborg05790c62006-03-20 22:37:04 -0800162static void bcbuf_decr_acks(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100163{
164 bcbuf_set_acks(buf, bcbuf_acks(buf) - 1);
165}
166
Allan Stephenscd3decd2011-10-24 11:18:12 -0400167void tipc_bclink_add_node(u32 addr)
168{
Ying Xued69afc92014-05-05 08:56:15 +0800169 tipc_bclink_lock();
Allan Stephenscd3decd2011-10-24 11:18:12 -0400170 tipc_nmap_add(&bclink->bcast_nodes, addr);
Ying Xued69afc92014-05-05 08:56:15 +0800171 tipc_bclink_unlock();
Allan Stephenscd3decd2011-10-24 11:18:12 -0400172}
173
174void tipc_bclink_remove_node(u32 addr)
175{
Ying Xued69afc92014-05-05 08:56:15 +0800176 tipc_bclink_lock();
Allan Stephenscd3decd2011-10-24 11:18:12 -0400177 tipc_nmap_remove(&bclink->bcast_nodes, addr);
Ying Xued69afc92014-05-05 08:56:15 +0800178 tipc_bclink_unlock();
Allan Stephenscd3decd2011-10-24 11:18:12 -0400179}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100180
Allan Stephens5b1f7bd2010-08-17 11:00:09 +0000181static void bclink_set_last_sent(void)
182{
183 if (bcl->next_out)
184 bcl->fsm_msg_cnt = mod(buf_seqno(bcl->next_out) - 1);
185 else
186 bcl->fsm_msg_cnt = mod(bcl->next_out_no - 1);
187}
188
189u32 tipc_bclink_get_last_sent(void)
190{
191 return bcl->fsm_msg_cnt;
192}
193
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400194static void bclink_update_last_sent(struct tipc_node *node, u32 seqno)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100195{
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400196 node->bclink.last_sent = less_eq(node->bclink.last_sent, seqno) ?
197 seqno : node->bclink.last_sent;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100198}
199
200
Ben Hutchings2c530402012-07-10 10:55:09 +0000201/**
Allan Stephens01d83ed2011-01-18 13:53:16 -0500202 * tipc_bclink_retransmit_to - get most recent node to request retransmission
203 *
Ying Xued69afc92014-05-05 08:56:15 +0800204 * Called with bclink_lock locked
Allan Stephens01d83ed2011-01-18 13:53:16 -0500205 */
Allan Stephens01d83ed2011-01-18 13:53:16 -0500206struct tipc_node *tipc_bclink_retransmit_to(void)
207{
208 return bclink->retransmit_to;
209}
210
211/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100212 * bclink_retransmit_pkt - retransmit broadcast packets
213 * @after: sequence number of last packet to *not* retransmit
214 * @to: sequence number of last packet to retransmit
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900215 *
Ying Xued69afc92014-05-05 08:56:15 +0800216 * Called with bclink_lock locked
Per Lidenb97bf3f2006-01-02 19:04:38 +0100217 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100218static void bclink_retransmit_pkt(u32 after, u32 to)
219{
220 struct sk_buff *buf;
221
Per Lidenb97bf3f2006-01-02 19:04:38 +0100222 buf = bcl->first_out;
Allan Stephensa0168922010-12-31 18:59:35 +0000223 while (buf && less_eq(buf_seqno(buf), after))
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900224 buf = buf->next;
Allan Stephensd356eeb2006-06-25 23:40:01 -0700225 tipc_link_retransmit(bcl, buf, mod(to - after));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100226}
227
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900228/**
Jon Maloy908344c2014-10-07 14:12:34 -0400229 * tipc_bclink_wakeup_users - wake up pending users
230 *
231 * Called with no locks taken
232 */
233void tipc_bclink_wakeup_users(void)
234{
235 while (skb_queue_len(&bclink->link.waiting_sks))
236 tipc_sk_rcv(skb_dequeue(&bclink->link.waiting_sks));
237}
238
239/**
Per Liden4323add2006-01-18 00:38:21 +0100240 * tipc_bclink_acknowledge - handle acknowledgement of broadcast packets
Per Lidenb97bf3f2006-01-02 19:04:38 +0100241 * @n_ptr: node that sent acknowledgement info
242 * @acked: broadcast sequence # that has been acknowledged
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900243 *
Ying Xued69afc92014-05-05 08:56:15 +0800244 * Node is locked, bclink_lock unlocked.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100245 */
David S. Miller6c000552008-09-02 23:38:32 -0700246void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100247{
248 struct sk_buff *crs;
249 struct sk_buff *next;
250 unsigned int released = 0;
251
Ying Xued69afc92014-05-05 08:56:15 +0800252 tipc_bclink_lock();
Allan Stephens365595912011-10-24 15:26:24 -0400253 /* Bail out if tx queue is empty (no clean up is required) */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100254 crs = bcl->first_out;
Allan Stephens365595912011-10-24 15:26:24 -0400255 if (!crs)
256 goto exit;
257
258 /* Determine which messages need to be acknowledged */
259 if (acked == INVALID_LINK_SEQ) {
260 /*
261 * Contact with specified node has been lost, so need to
262 * acknowledge sent messages only (if other nodes still exist)
263 * or both sent and unsent messages (otherwise)
264 */
265 if (bclink->bcast_nodes.count)
266 acked = bcl->fsm_msg_cnt;
267 else
268 acked = bcl->next_out_no;
269 } else {
270 /*
271 * Bail out if specified sequence number does not correspond
272 * to a message that has been sent and not yet acknowledged
273 */
274 if (less(acked, buf_seqno(crs)) ||
275 less(bcl->fsm_msg_cnt, acked) ||
276 less_eq(acked, n_ptr->bclink.acked))
277 goto exit;
278 }
279
280 /* Skip over packets that node has previously acknowledged */
Allan Stephensa0168922010-12-31 18:59:35 +0000281 while (crs && less_eq(buf_seqno(crs), n_ptr->bclink.acked))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100282 crs = crs->next;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100283
284 /* Update packets that node is now acknowledging */
285
286 while (crs && less_eq(buf_seqno(crs), acked)) {
287 next = crs->next;
Allan Stephens10745cd2011-10-24 14:59:20 -0400288
289 if (crs != bcl->next_out)
290 bcbuf_decr_acks(crs);
Allan Stephens10745cd2011-10-24 14:59:20 -0400291 else {
292 bcbuf_set_acks(crs, 0);
293 bcl->next_out = next;
294 bclink_set_last_sent();
295 }
296
Per Lidenb97bf3f2006-01-02 19:04:38 +0100297 if (bcbuf_acks(crs) == 0) {
298 bcl->first_out = next;
299 bcl->out_queue_size--;
Allan Stephens5f6d9122011-11-04 13:24:29 -0400300 kfree_skb(crs);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100301 released = 1;
302 }
303 crs = next;
304 }
305 n_ptr->bclink.acked = acked;
306
307 /* Try resolving broadcast link congestion, if necessary */
308
Allan Stephens5b1f7bd2010-08-17 11:00:09 +0000309 if (unlikely(bcl->next_out)) {
Per Liden4323add2006-01-18 00:38:21 +0100310 tipc_link_push_queue(bcl);
Allan Stephens5b1f7bd2010-08-17 11:00:09 +0000311 bclink_set_last_sent();
312 }
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400313 if (unlikely(released && !skb_queue_empty(&bcl->waiting_sks)))
Jon Maloy908344c2014-10-07 14:12:34 -0400314 n_ptr->action_flags |= TIPC_WAKEUP_BCAST_USERS;
315
Allan Stephens365595912011-10-24 15:26:24 -0400316exit:
Ying Xued69afc92014-05-05 08:56:15 +0800317 tipc_bclink_unlock();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100318}
319
Ben Hutchings2c530402012-07-10 10:55:09 +0000320/**
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400321 * tipc_bclink_update_link_state - update broadcast link state
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900322 *
Ying Xue7216cd92014-04-21 10:55:48 +0800323 * RCU and node lock set
Per Lidenb97bf3f2006-01-02 19:04:38 +0100324 */
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400325void tipc_bclink_update_link_state(struct tipc_node *n_ptr, u32 last_sent)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100326{
327 struct sk_buff *buf;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100328
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400329 /* Ignore "stale" link state info */
330
331 if (less_eq(last_sent, n_ptr->bclink.last_in))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100332 return;
333
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400334 /* Update link synchronization state; quit if in sync */
335
336 bclink_update_last_sent(n_ptr, last_sent);
337
338 if (n_ptr->bclink.last_sent == n_ptr->bclink.last_in)
339 return;
340
341 /* Update out-of-sync state; quit if loss is still unconfirmed */
342
343 if ((++n_ptr->bclink.oos_state) == 1) {
344 if (n_ptr->bclink.deferred_size < (TIPC_MIN_LINK_WIN / 2))
345 return;
346 n_ptr->bclink.oos_state++;
347 }
348
349 /* Don't NACK if one has been recently sent (or seen) */
350
351 if (n_ptr->bclink.oos_state & 0x1)
352 return;
353
354 /* Send NACK */
355
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000356 buf = tipc_buf_acquire(INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100357 if (buf) {
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400358 struct tipc_msg *msg = buf_msg(buf);
359
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000360 tipc_msg_init(msg, BCAST_PROTOCOL, STATE_MSG,
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400361 INT_H_SIZE, n_ptr->addr);
Allan Stephensbf781ec2011-01-25 16:12:39 -0500362 msg_set_non_seq(msg, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100363 msg_set_mc_netid(msg, tipc_net_id);
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400364 msg_set_bcast_ack(msg, n_ptr->bclink.last_in);
365 msg_set_bcgap_after(msg, n_ptr->bclink.last_in);
366 msg_set_bcgap_to(msg, n_ptr->bclink.deferred_head
367 ? buf_seqno(n_ptr->bclink.deferred_head) - 1
368 : n_ptr->bclink.last_sent);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100369
Ying Xued69afc92014-05-05 08:56:15 +0800370 tipc_bclink_lock();
Ying Xue7a2f7d12014-04-21 10:55:46 +0800371 tipc_bearer_send(MAX_BEARERS, buf, NULL);
Allan Stephens0f385132011-04-07 15:47:48 -0400372 bcl->stats.sent_nacks++;
Ying Xued69afc92014-05-05 08:56:15 +0800373 tipc_bclink_unlock();
Allan Stephens5f6d9122011-11-04 13:24:29 -0400374 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100375
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400376 n_ptr->bclink.oos_state++;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100377 }
378}
379
Ben Hutchings2c530402012-07-10 10:55:09 +0000380/**
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400381 * bclink_peek_nack - monitor retransmission requests sent by other nodes
Per Lidenb97bf3f2006-01-02 19:04:38 +0100382 *
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400383 * Delay any upcoming NACK by this node if another node has already
384 * requested the first message this node is going to ask for.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100385 */
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400386static void bclink_peek_nack(struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100387{
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400388 struct tipc_node *n_ptr = tipc_node_find(msg_destnode(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100389
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400390 if (unlikely(!n_ptr))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100391 return;
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400392
Per Liden4323add2006-01-18 00:38:21 +0100393 tipc_node_lock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100394
Ying Xue389dd9b2012-11-16 13:51:30 +0800395 if (n_ptr->bclink.recv_permitted &&
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400396 (n_ptr->bclink.last_in != n_ptr->bclink.last_sent) &&
397 (n_ptr->bclink.last_in == msg_bcgap_after(msg)))
398 n_ptr->bclink.oos_state = 2;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100399
Per Liden4323add2006-01-18 00:38:21 +0100400 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100401}
402
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400403/* tipc_bclink_xmit - broadcast buffer chain to all nodes in cluster
404 * and to identified node local sockets
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400405 * @buf: chain of buffers containing message
406 * Consumes the buffer chain, except when returning -ELINKCONG
407 * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
408 */
Jon Paul Maloy9fbfb8b2014-07-16 20:41:03 -0400409int tipc_bclink_xmit(struct sk_buff *buf)
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400410{
411 int rc = 0;
412 int bc = 0;
413 struct sk_buff *clbuf;
414
415 /* Prepare clone of message for local node */
416 clbuf = tipc_msg_reassemble(buf);
417 if (unlikely(!clbuf)) {
418 kfree_skb_list(buf);
419 return -EHOSTUNREACH;
420 }
421
422 /* Broadcast to all other nodes */
423 if (likely(bclink)) {
424 tipc_bclink_lock();
425 if (likely(bclink->bcast_nodes.count)) {
426 rc = __tipc_link_xmit(bcl, buf);
427 if (likely(!rc)) {
428 bclink_set_last_sent();
429 bcl->stats.queue_sz_counts++;
430 bcl->stats.accu_queue_sz += bcl->out_queue_size;
431 }
432 bc = 1;
433 }
434 tipc_bclink_unlock();
435 }
436
437 if (unlikely(!bc))
438 kfree_skb_list(buf);
439
440 /* Deliver message clone */
441 if (likely(!rc))
442 tipc_sk_mcast_rcv(clbuf);
443 else
444 kfree_skb(clbuf);
445
446 return rc;
447}
448
Ben Hutchings2c530402012-07-10 10:55:09 +0000449/**
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400450 * bclink_accept_pkt - accept an incoming, in-sequence broadcast packet
451 *
Ying Xued69afc92014-05-05 08:56:15 +0800452 * Called with both sending node's lock and bclink_lock taken.
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400453 */
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400454static void bclink_accept_pkt(struct tipc_node *node, u32 seqno)
455{
456 bclink_update_last_sent(node, seqno);
457 node->bclink.last_in = seqno;
458 node->bclink.oos_state = 0;
459 bcl->stats.recv_info++;
460
461 /*
462 * Unicast an ACK periodically, ensuring that
463 * all nodes in the cluster don't ACK at the same time
464 */
465
466 if (((seqno - tipc_own_addr) % TIPC_MIN_LINK_WIN) == 0) {
Ying Xue247f0f32014-02-18 16:06:46 +0800467 tipc_link_proto_xmit(node->active_links[node->addr & 1],
468 STATE_MSG, 0, 0, 0, 0, 0);
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400469 bcl->stats.sent_acks++;
470 }
471}
472
Ben Hutchings2c530402012-07-10 10:55:09 +0000473/**
Ying Xue247f0f32014-02-18 16:06:46 +0800474 * tipc_bclink_rcv - receive a broadcast packet, and deliver upwards
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900475 *
Ying Xue7216cd92014-04-21 10:55:48 +0800476 * RCU is locked, no other locks set
Per Lidenb97bf3f2006-01-02 19:04:38 +0100477 */
Ying Xue247f0f32014-02-18 16:06:46 +0800478void tipc_bclink_rcv(struct sk_buff *buf)
Allan Stephensd356eeb2006-06-25 23:40:01 -0700479{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100480 struct tipc_msg *msg = buf_msg(buf);
Allan Stephens5d3c4882011-04-07 13:57:25 -0400481 struct tipc_node *node;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100482 u32 next_in;
483 u32 seqno;
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400484 int deferred = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100485
Allan Stephens5d3c4882011-04-07 13:57:25 -0400486 /* Screen out unwanted broadcast messages */
487
488 if (msg_mc_netid(msg) != tipc_net_id)
489 goto exit;
490
491 node = tipc_node_find(msg_prevnode(msg));
492 if (unlikely(!node))
493 goto exit;
494
495 tipc_node_lock(node);
Ying Xue389dd9b2012-11-16 13:51:30 +0800496 if (unlikely(!node->bclink.recv_permitted))
Allan Stephens5d3c4882011-04-07 13:57:25 -0400497 goto unlock;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100498
Allan Stephens8a275a62011-10-26 15:33:44 -0400499 /* Handle broadcast protocol message */
500
Per Lidenb97bf3f2006-01-02 19:04:38 +0100501 if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) {
Allan Stephens9f6bdcd42011-04-07 14:57:53 -0400502 if (msg_type(msg) != STATE_MSG)
503 goto unlock;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100504 if (msg_destnode(msg) == tipc_own_addr) {
Per Liden4323add2006-01-18 00:38:21 +0100505 tipc_bclink_acknowledge(node, msg_bcast_ack(msg));
506 tipc_node_unlock(node);
Ying Xued69afc92014-05-05 08:56:15 +0800507 tipc_bclink_lock();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100508 bcl->stats.recv_nacks++;
Allan Stephens01d83ed2011-01-18 13:53:16 -0500509 bclink->retransmit_to = node;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100510 bclink_retransmit_pkt(msg_bcgap_after(msg),
511 msg_bcgap_to(msg));
Ying Xued69afc92014-05-05 08:56:15 +0800512 tipc_bclink_unlock();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100513 } else {
Allan Stephens5d3c4882011-04-07 13:57:25 -0400514 tipc_node_unlock(node);
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400515 bclink_peek_nack(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100516 }
Allan Stephens5d3c4882011-04-07 13:57:25 -0400517 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100518 }
519
Allan Stephens5d3c4882011-04-07 13:57:25 -0400520 /* Handle in-sequence broadcast message */
521
Per Lidenb97bf3f2006-01-02 19:04:38 +0100522 seqno = msg_seqno(msg);
Allan Stephens8a275a62011-10-26 15:33:44 -0400523 next_in = mod(node->bclink.last_in + 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100524
525 if (likely(seqno == next_in)) {
Allan Stephens8a275a62011-10-26 15:33:44 -0400526receive:
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400527 /* Deliver message to destination */
528
Per Lidenb97bf3f2006-01-02 19:04:38 +0100529 if (likely(msg_isdata(msg))) {
Ying Xued69afc92014-05-05 08:56:15 +0800530 tipc_bclink_lock();
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400531 bclink_accept_pkt(node, seqno);
Ying Xued69afc92014-05-05 08:56:15 +0800532 tipc_bclink_unlock();
Per Liden4323add2006-01-18 00:38:21 +0100533 tipc_node_unlock(node);
Allan Stephens9f6bdcd42011-04-07 14:57:53 -0400534 if (likely(msg_mcast(msg)))
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400535 tipc_sk_mcast_rcv(buf);
Allan Stephens9f6bdcd42011-04-07 14:57:53 -0400536 else
Allan Stephens5f6d9122011-11-04 13:24:29 -0400537 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100538 } else if (msg_user(msg) == MSG_BUNDLER) {
Ying Xued69afc92014-05-05 08:56:15 +0800539 tipc_bclink_lock();
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400540 bclink_accept_pkt(node, seqno);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100541 bcl->stats.recv_bundles++;
542 bcl->stats.recv_bundled += msg_msgcnt(msg);
Ying Xued69afc92014-05-05 08:56:15 +0800543 tipc_bclink_unlock();
Per Liden4323add2006-01-18 00:38:21 +0100544 tipc_node_unlock(node);
Ying Xue247f0f32014-02-18 16:06:46 +0800545 tipc_link_bundle_rcv(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100546 } else if (msg_user(msg) == MSG_FRAGMENTER) {
Jon Paul Maloy37e22162014-05-14 05:39:12 -0400547 tipc_buf_append(&node->bclink.reasm_buf, &buf);
548 if (unlikely(!buf && !node->bclink.reasm_buf))
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400549 goto unlock;
Ying Xued69afc92014-05-05 08:56:15 +0800550 tipc_bclink_lock();
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400551 bclink_accept_pkt(node, seqno);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100552 bcl->stats.recv_fragments++;
Jon Paul Maloy37e22162014-05-14 05:39:12 -0400553 if (buf) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100554 bcl->stats.recv_fragmented++;
Erik Hugne40ba3cd2013-11-06 09:28:06 +0100555 msg = buf_msg(buf);
Ying Xued69afc92014-05-05 08:56:15 +0800556 tipc_bclink_unlock();
Erik Hugne528f6f42013-11-06 09:28:05 +0100557 goto receive;
558 }
Ying Xued69afc92014-05-05 08:56:15 +0800559 tipc_bclink_unlock();
Per Liden4323add2006-01-18 00:38:21 +0100560 tipc_node_unlock(node);
Allan Stephens9f6bdcd42011-04-07 14:57:53 -0400561 } else if (msg_user(msg) == NAME_DISTRIBUTOR) {
Ying Xued69afc92014-05-05 08:56:15 +0800562 tipc_bclink_lock();
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400563 bclink_accept_pkt(node, seqno);
Ying Xued69afc92014-05-05 08:56:15 +0800564 tipc_bclink_unlock();
Allan Stephens9f6bdcd42011-04-07 14:57:53 -0400565 tipc_node_unlock(node);
Ying Xue247f0f32014-02-18 16:06:46 +0800566 tipc_named_rcv(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100567 } else {
Ying Xued69afc92014-05-05 08:56:15 +0800568 tipc_bclink_lock();
Allan Stephens63e7f1a2011-10-27 16:43:09 -0400569 bclink_accept_pkt(node, seqno);
Ying Xued69afc92014-05-05 08:56:15 +0800570 tipc_bclink_unlock();
Per Liden4323add2006-01-18 00:38:21 +0100571 tipc_node_unlock(node);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400572 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100573 }
Allan Stephens5d3c4882011-04-07 13:57:25 -0400574 buf = NULL;
Allan Stephens8a275a62011-10-26 15:33:44 -0400575
576 /* Determine new synchronization state */
577
Allan Stephens5d3c4882011-04-07 13:57:25 -0400578 tipc_node_lock(node);
Allan Stephens8a275a62011-10-26 15:33:44 -0400579 if (unlikely(!tipc_node_is_up(node)))
580 goto unlock;
581
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400582 if (node->bclink.last_in == node->bclink.last_sent)
Allan Stephens8a275a62011-10-26 15:33:44 -0400583 goto unlock;
584
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400585 if (!node->bclink.deferred_head) {
586 node->bclink.oos_state = 1;
587 goto unlock;
588 }
589
Allan Stephens8a275a62011-10-26 15:33:44 -0400590 msg = buf_msg(node->bclink.deferred_head);
591 seqno = msg_seqno(msg);
592 next_in = mod(next_in + 1);
593 if (seqno != next_in)
594 goto unlock;
595
596 /* Take in-sequence message from deferred queue & deliver it */
597
598 buf = node->bclink.deferred_head;
599 node->bclink.deferred_head = buf->next;
Jon Paul Maloy99941752014-07-11 08:45:27 -0400600 buf->next = NULL;
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400601 node->bclink.deferred_size--;
Allan Stephens8a275a62011-10-26 15:33:44 -0400602 goto receive;
603 }
604
605 /* Handle out-of-sequence broadcast message */
606
607 if (less(next_in, seqno)) {
Allan Stephens8a275a62011-10-26 15:33:44 -0400608 deferred = tipc_link_defer_pkt(&node->bclink.deferred_head,
609 &node->bclink.deferred_tail,
610 buf);
Allan Stephens7a54d4a2011-10-27 14:17:53 -0400611 node->bclink.deferred_size += deferred;
612 bclink_update_last_sent(node, seqno);
Allan Stephens5d3c4882011-04-07 13:57:25 -0400613 buf = NULL;
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400614 }
Allan Stephens8a275a62011-10-26 15:33:44 -0400615
Ying Xued69afc92014-05-05 08:56:15 +0800616 tipc_bclink_lock();
Allan Stephensb98158e2011-10-26 16:13:35 -0400617
Allan Stephens8a275a62011-10-26 15:33:44 -0400618 if (deferred)
619 bcl->stats.deferred_recv++;
Allan Stephens0232c5a2011-10-26 15:57:26 -0400620 else
621 bcl->stats.duplicates++;
Allan Stephens8a275a62011-10-26 15:33:44 -0400622
Ying Xued69afc92014-05-05 08:56:15 +0800623 tipc_bclink_unlock();
Allan Stephensb98158e2011-10-26 16:13:35 -0400624
Allan Stephens5d3c4882011-04-07 13:57:25 -0400625unlock:
Per Liden4323add2006-01-18 00:38:21 +0100626 tipc_node_unlock(node);
Allan Stephens5d3c4882011-04-07 13:57:25 -0400627exit:
Allan Stephens5f6d9122011-11-04 13:24:29 -0400628 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100629}
630
David S. Miller6c000552008-09-02 23:38:32 -0700631u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100632{
Ying Xue389dd9b2012-11-16 13:51:30 +0800633 return (n_ptr->bclink.recv_permitted &&
Per Liden4323add2006-01-18 00:38:21 +0100634 (tipc_bclink_get_last_sent() != n_ptr->bclink.acked));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100635}
636
637
638/**
Per Liden4323add2006-01-18 00:38:21 +0100639 * tipc_bcbearer_send - send a packet through the broadcast pseudo-bearer
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900640 *
Allan Stephens2ff9f922011-04-07 10:44:54 -0400641 * Send packet over as many bearers as necessary to reach all nodes
642 * that have joined the broadcast link.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900643 *
Allan Stephens2ff9f922011-04-07 10:44:54 -0400644 * Returns 0 (packet sent successfully) under all circumstances,
645 * since the broadcast link's pseudo-bearer never blocks
Per Lidenb97bf3f2006-01-02 19:04:38 +0100646 */
Paul Gortmakerae8509c2013-06-17 10:54:47 -0400647static int tipc_bcbearer_send(struct sk_buff *buf, struct tipc_bearer *unused1,
Adrian Bunk988f0882006-03-20 22:37:52 -0800648 struct tipc_media_addr *unused2)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100649{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100650 int bp_index;
Jon Paul Maloy6f92ee52014-07-16 20:41:04 -0400651 struct tipc_msg *msg = buf_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100652
Gerlando Falautoe6160712013-05-01 12:04:44 +0000653 /* Prepare broadcast link message for reliable transmission,
Allan Stephens2ff9f922011-04-07 10:44:54 -0400654 * if first time trying to send it;
655 * preparation is skipped for broadcast link protocol messages
656 * since they are sent in an unreliable manner and don't need it
657 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100658 if (likely(!msg_non_seq(buf_msg(buf)))) {
Allan Stephenscd3decd2011-10-24 11:18:12 -0400659 bcbuf_set_acks(buf, bclink->bcast_nodes.count);
Allan Stephens40aecb12008-06-04 17:54:48 -0700660 msg_set_non_seq(msg, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100661 msg_set_mc_netid(msg, tipc_net_id);
Allan Stephens0048b822010-08-17 11:00:10 +0000662 bcl->stats.sent_info++;
Allan Stephens5e726902011-05-23 13:14:18 -0400663
Allan Stephenscd3decd2011-10-24 11:18:12 -0400664 if (WARN_ON(!bclink->bcast_nodes.count)) {
Allan Stephens5e726902011-05-23 13:14:18 -0400665 dump_stack();
666 return 0;
667 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100668 }
669
Per Lidenb97bf3f2006-01-02 19:04:38 +0100670 /* Send buffer over bearers until all targets reached */
Allan Stephenscd3decd2011-10-24 11:18:12 -0400671 bcbearer->remains = bclink->bcast_nodes;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100672
673 for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) {
Allan Stephens2d627b92011-01-07 13:00:11 -0500674 struct tipc_bearer *p = bcbearer->bpairs[bp_index].primary;
675 struct tipc_bearer *s = bcbearer->bpairs[bp_index].secondary;
Jon Paul Maloy6f92ee52014-07-16 20:41:04 -0400676 struct tipc_bearer *bp[2] = {p, s};
677 struct tipc_bearer *b = bp[msg_link_selector(msg)];
Gerlando Falauto488fc9a2013-05-01 12:04:46 +0000678 struct sk_buff *tbuf;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100679
680 if (!p)
Gerlando Falautoe6160712013-05-01 12:04:44 +0000681 break; /* No more bearers to try */
Jon Paul Maloy6f92ee52014-07-16 20:41:04 -0400682 if (!b)
683 b = p;
Gerlando Falauto77861d92013-05-01 12:04:45 +0000684 tipc_nmap_diff(&bcbearer->remains, &b->nodes,
Gerlando Falautoe6160712013-05-01 12:04:44 +0000685 &bcbearer->remains_new);
Allan Stephens65f51ef2006-06-25 23:53:20 -0700686 if (bcbearer->remains_new.count == bcbearer->remains.count)
Gerlando Falautoe6160712013-05-01 12:04:44 +0000687 continue; /* Nothing added by bearer pair */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100688
Gerlando Falauto488fc9a2013-05-01 12:04:46 +0000689 if (bp_index == 0) {
690 /* Use original buffer for first bearer */
Ying Xue7a2f7d12014-04-21 10:55:46 +0800691 tipc_bearer_send(b->identity, buf, &b->bcast_addr);
Gerlando Falauto488fc9a2013-05-01 12:04:46 +0000692 } else {
693 /* Avoid concurrent buffer access */
Octavian Purdilabad93e92014-06-12 01:36:26 +0300694 tbuf = pskb_copy_for_clone(buf, GFP_ATOMIC);
Gerlando Falauto488fc9a2013-05-01 12:04:46 +0000695 if (!tbuf)
696 break;
Ying Xue7a2f7d12014-04-21 10:55:46 +0800697 tipc_bearer_send(b->identity, tbuf, &b->bcast_addr);
Gerlando Falauto488fc9a2013-05-01 12:04:46 +0000698 kfree_skb(tbuf); /* Bearer keeps a clone */
699 }
Allan Stephens65f51ef2006-06-25 23:53:20 -0700700 if (bcbearer->remains_new.count == 0)
Gerlando Falautoe6160712013-05-01 12:04:44 +0000701 break; /* All targets reached */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100702
Allan Stephens65f51ef2006-06-25 23:53:20 -0700703 bcbearer->remains = bcbearer->remains_new;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100704 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900705
Allan Stephens2ff9f922011-04-07 10:44:54 -0400706 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100707}
708
709/**
Per Liden4323add2006-01-18 00:38:21 +0100710 * tipc_bcbearer_sort - create sets of bearer pairs used by broadcast bearer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100711 */
Ying Xue28dd9412014-04-21 10:55:51 +0800712void tipc_bcbearer_sort(struct tipc_node_map *nm_ptr, u32 node, bool action)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100713{
Paul Gortmaker7f9ab6a2011-12-29 20:55:27 -0500714 struct tipc_bcbearer_pair *bp_temp = bcbearer->bpairs_temp;
715 struct tipc_bcbearer_pair *bp_curr;
Ying Xuef8322df2014-04-21 10:55:45 +0800716 struct tipc_bearer *b;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100717 int b_index;
718 int pri;
719
Ying Xued69afc92014-05-05 08:56:15 +0800720 tipc_bclink_lock();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100721
Ying Xue28dd9412014-04-21 10:55:51 +0800722 if (action)
723 tipc_nmap_add(nm_ptr, node);
724 else
725 tipc_nmap_remove(nm_ptr, node);
726
Per Lidenb97bf3f2006-01-02 19:04:38 +0100727 /* Group bearers by priority (can assume max of two per priority) */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100728 memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp));
729
Ying Xuef8322df2014-04-21 10:55:45 +0800730 rcu_read_lock();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100731 for (b_index = 0; b_index < MAX_BEARERS; b_index++) {
Ying Xuef8322df2014-04-21 10:55:45 +0800732 b = rcu_dereference_rtnl(bearer_list[b_index]);
Ying Xuef47de122014-03-27 12:54:34 +0800733 if (!b || !b->nodes.count)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100734 continue;
735
736 if (!bp_temp[b->priority].primary)
737 bp_temp[b->priority].primary = b;
738 else
739 bp_temp[b->priority].secondary = b;
740 }
Ying Xuef8322df2014-04-21 10:55:45 +0800741 rcu_read_unlock();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100742
743 /* Create array of bearer pairs for broadcasting */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100744 bp_curr = bcbearer->bpairs;
745 memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs));
746
Per Liden16cb4b32006-01-13 22:22:22 +0100747 for (pri = TIPC_MAX_LINK_PRI; pri >= 0; pri--) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100748
749 if (!bp_temp[pri].primary)
750 continue;
751
752 bp_curr->primary = bp_temp[pri].primary;
753
754 if (bp_temp[pri].secondary) {
Per Liden4323add2006-01-18 00:38:21 +0100755 if (tipc_nmap_equal(&bp_temp[pri].primary->nodes,
756 &bp_temp[pri].secondary->nodes)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100757 bp_curr->secondary = bp_temp[pri].secondary;
758 } else {
759 bp_curr++;
760 bp_curr->primary = bp_temp[pri].secondary;
761 }
762 }
763
764 bp_curr++;
765 }
766
Ying Xued69afc92014-05-05 08:56:15 +0800767 tipc_bclink_unlock();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100768}
769
Per Lidenb97bf3f2006-01-02 19:04:38 +0100770
Per Liden4323add2006-01-18 00:38:21 +0100771int tipc_bclink_stats(char *buf, const u32 buf_size)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100772{
Erik Hugnedc1aed32012-06-29 00:50:23 -0400773 int ret;
774 struct tipc_stats *s;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100775
776 if (!bcl)
777 return 0;
778
Ying Xued69afc92014-05-05 08:56:15 +0800779 tipc_bclink_lock();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100780
Erik Hugnedc1aed32012-06-29 00:50:23 -0400781 s = &bcl->stats;
782
783 ret = tipc_snprintf(buf, buf_size, "Link <%s>\n"
784 " Window:%u packets\n",
785 bcl->name, bcl->queue_limit[0]);
786 ret += tipc_snprintf(buf + ret, buf_size - ret,
787 " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
788 s->recv_info, s->recv_fragments,
789 s->recv_fragmented, s->recv_bundles,
790 s->recv_bundled);
791 ret += tipc_snprintf(buf + ret, buf_size - ret,
792 " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
793 s->sent_info, s->sent_fragments,
794 s->sent_fragmented, s->sent_bundles,
795 s->sent_bundled);
796 ret += tipc_snprintf(buf + ret, buf_size - ret,
797 " RX naks:%u defs:%u dups:%u\n",
798 s->recv_nacks, s->deferred_recv, s->duplicates);
799 ret += tipc_snprintf(buf + ret, buf_size - ret,
800 " TX naks:%u acks:%u dups:%u\n",
801 s->sent_nacks, s->sent_acks, s->retransmitted);
802 ret += tipc_snprintf(buf + ret, buf_size - ret,
Ying Xue3c294cb2012-11-15 11:34:45 +0800803 " Congestion link:%u Send queue max:%u avg:%u\n",
804 s->link_congs, s->max_queue_sz,
Erik Hugnedc1aed32012-06-29 00:50:23 -0400805 s->queue_sz_counts ?
806 (s->accu_queue_sz / s->queue_sz_counts) : 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100807
Ying Xued69afc92014-05-05 08:56:15 +0800808 tipc_bclink_unlock();
Erik Hugnedc1aed32012-06-29 00:50:23 -0400809 return ret;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100810}
811
Per Liden4323add2006-01-18 00:38:21 +0100812int tipc_bclink_reset_stats(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100813{
814 if (!bcl)
815 return -ENOPROTOOPT;
816
Ying Xued69afc92014-05-05 08:56:15 +0800817 tipc_bclink_lock();
Per Lidenb97bf3f2006-01-02 19:04:38 +0100818 memset(&bcl->stats, 0, sizeof(bcl->stats));
Ying Xued69afc92014-05-05 08:56:15 +0800819 tipc_bclink_unlock();
Allan Stephens0e35fd52008-07-14 22:44:01 -0700820 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100821}
822
Per Liden4323add2006-01-18 00:38:21 +0100823int tipc_bclink_set_queue_limits(u32 limit)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100824{
825 if (!bcl)
826 return -ENOPROTOOPT;
827 if ((limit < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN))
828 return -EINVAL;
829
Ying Xued69afc92014-05-05 08:56:15 +0800830 tipc_bclink_lock();
Per Liden4323add2006-01-18 00:38:21 +0100831 tipc_link_set_queue_limits(bcl, limit);
Ying Xued69afc92014-05-05 08:56:15 +0800832 tipc_bclink_unlock();
Allan Stephens0e35fd52008-07-14 22:44:01 -0700833 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100834}
835
Ying Xueeb8b00f2014-05-05 08:56:16 +0800836int tipc_bclink_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100837{
Ying Xueeb8b00f2014-05-05 08:56:16 +0800838 bcbearer = kzalloc(sizeof(*bcbearer), GFP_ATOMIC);
839 if (!bcbearer)
840 return -ENOMEM;
841
842 bclink = kzalloc(sizeof(*bclink), GFP_ATOMIC);
843 if (!bclink) {
844 kfree(bcbearer);
845 return -ENOMEM;
846 }
847
848 bcl = &bclink->link;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100849 bcbearer->bearer.media = &bcbearer->media;
Per Liden4323add2006-01-18 00:38:21 +0100850 bcbearer->media.send_msg = tipc_bcbearer_send;
Allan Stephens2e2d9be2011-04-07 10:22:31 -0400851 sprintf(bcbearer->media.name, "tipc-broadcast");
Per Lidenb97bf3f2006-01-02 19:04:38 +0100852
Ying Xued69afc92014-05-05 08:56:15 +0800853 spin_lock_init(&bclink->lock);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400854 __skb_queue_head_init(&bcl->waiting_sks);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100855 bcl->next_out_no = 1;
Ingo Molnar34af9462006-06-27 02:53:55 -0700856 spin_lock_init(&bclink->node.lock);
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400857 __skb_queue_head_init(&bclink->node.waiting_sks);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100858 bcl->owner = &bclink->node;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900859 bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
Per Liden4323add2006-01-18 00:38:21 +0100860 tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
Ying Xue7a2f7d12014-04-21 10:55:46 +0800861 bcl->bearer_id = MAX_BEARERS;
Ying Xuef8322df2014-04-21 10:55:45 +0800862 rcu_assign_pointer(bearer_list[MAX_BEARERS], &bcbearer->bearer);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100863 bcl->state = WORKING_WORKING;
Stephen Hemminger4b704d52009-03-18 19:11:29 -0700864 strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME);
Ying Xueeb8b00f2014-05-05 08:56:16 +0800865 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100866}
867
Per Liden4323add2006-01-18 00:38:21 +0100868void tipc_bclink_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100869{
Ying Xued69afc92014-05-05 08:56:15 +0800870 tipc_bclink_lock();
Jon Paul Maloy581465f2014-01-07 17:02:44 -0500871 tipc_link_purge_queues(bcl);
Ying Xued69afc92014-05-05 08:56:15 +0800872 tipc_bclink_unlock();
Allan Stephensc47e9b92011-10-24 10:29:26 -0400873
Ying Xuef8322df2014-04-21 10:55:45 +0800874 RCU_INIT_POINTER(bearer_list[BCBEARER], NULL);
Ying Xueeb8b00f2014-05-05 08:56:16 +0800875 synchronize_net();
876 kfree(bcbearer);
877 kfree(bclink);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100878}
879
Allan Stephens3e22e622010-05-11 14:30:14 +0000880/**
881 * tipc_nmap_add - add a node to a node map
882 */
Ying Xue28dd9412014-04-21 10:55:51 +0800883static void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node)
Allan Stephens3e22e622010-05-11 14:30:14 +0000884{
885 int n = tipc_node(node);
886 int w = n / WSIZE;
887 u32 mask = (1 << (n % WSIZE));
888
889 if ((nm_ptr->map[w] & mask) == 0) {
890 nm_ptr->count++;
891 nm_ptr->map[w] |= mask;
892 }
893}
894
895/**
896 * tipc_nmap_remove - remove a node from a node map
897 */
Ying Xue28dd9412014-04-21 10:55:51 +0800898static void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node)
Allan Stephens3e22e622010-05-11 14:30:14 +0000899{
900 int n = tipc_node(node);
901 int w = n / WSIZE;
902 u32 mask = (1 << (n % WSIZE));
903
904 if ((nm_ptr->map[w] & mask) != 0) {
905 nm_ptr->map[w] &= ~mask;
906 nm_ptr->count--;
907 }
908}
909
910/**
911 * tipc_nmap_diff - find differences between node maps
912 * @nm_a: input node map A
913 * @nm_b: input node map B
914 * @nm_diff: output node map A-B (i.e. nodes of A that are not in B)
915 */
stephen hemminger31e3c3f2010-10-13 13:20:35 +0000916static void tipc_nmap_diff(struct tipc_node_map *nm_a,
917 struct tipc_node_map *nm_b,
918 struct tipc_node_map *nm_diff)
Allan Stephens3e22e622010-05-11 14:30:14 +0000919{
920 int stop = ARRAY_SIZE(nm_a->map);
921 int w;
922 int b;
923 u32 map;
924
925 memset(nm_diff, 0, sizeof(*nm_diff));
926 for (w = 0; w < stop; w++) {
927 map = nm_a->map[w] ^ (nm_a->map[w] & nm_b->map[w]);
928 nm_diff->map[w] = map;
929 if (map != 0) {
930 for (b = 0 ; b < WSIZE; b++) {
931 if (map & (1 << b))
932 nm_diff->count++;
933 }
934 }
935 }
936}
Allan Stephens43608ed2010-05-11 14:30:15 +0000937
938/**
939 * tipc_port_list_add - add a port to a port list, ensuring no duplicates
940 */
Paul Gortmaker45843102011-12-29 20:33:30 -0500941void tipc_port_list_add(struct tipc_port_list *pl_ptr, u32 port)
Allan Stephens43608ed2010-05-11 14:30:15 +0000942{
Paul Gortmaker45843102011-12-29 20:33:30 -0500943 struct tipc_port_list *item = pl_ptr;
Allan Stephens43608ed2010-05-11 14:30:15 +0000944 int i;
945 int item_sz = PLSIZE;
946 int cnt = pl_ptr->count;
947
948 for (; ; cnt -= item_sz, item = item->next) {
949 if (cnt < PLSIZE)
950 item_sz = cnt;
951 for (i = 0; i < item_sz; i++)
952 if (item->ports[i] == port)
953 return;
954 if (i < PLSIZE) {
955 item->ports[i] = port;
956 pl_ptr->count++;
957 return;
958 }
959 if (!item->next) {
960 item->next = kmalloc(sizeof(*item), GFP_ATOMIC);
961 if (!item->next) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400962 pr_warn("Incomplete multicast delivery, no memory\n");
Allan Stephens43608ed2010-05-11 14:30:15 +0000963 return;
964 }
965 item->next->next = NULL;
966 }
967 }
968}
969
970/**
971 * tipc_port_list_free - free dynamically created entries in port_list chain
972 *
973 */
Paul Gortmaker45843102011-12-29 20:33:30 -0500974void tipc_port_list_free(struct tipc_port_list *pl_ptr)
Allan Stephens43608ed2010-05-11 14:30:15 +0000975{
Paul Gortmaker45843102011-12-29 20:33:30 -0500976 struct tipc_port_list *item;
977 struct tipc_port_list *next;
Allan Stephens43608ed2010-05-11 14:30:15 +0000978
979 for (item = pl_ptr->next; item; item = next) {
980 next = item->next;
981 kfree(item);
982 }
983}