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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/link.c: TIPC link code
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Jon Paul Maloye74a3862016-03-03 14:23:21 -05004 * Copyright (c) 1996-2007, 2012-2016, Ericsson AB
Ying Xue198d73b2013-06-17 10:54:42 -04005 * Copyright (c) 2004-2007, 2010-2013, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
Jon Paul Maloye3eea1e2015-03-13 16:08:11 -040038#include "subscr.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "link.h"
Richard Alpe7be57fc2014-11-20 10:29:12 +010040#include "bcast.h"
Jon Paul Maloy9816f062014-05-14 05:39:15 -040041#include "socket.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010042#include "name_distr.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010043#include "discover.h"
Richard Alpe0655f6a2014-11-20 10:29:07 +010044#include "netlink.h"
Jon Paul Maloy35c55c92016-06-13 20:46:22 -040045#include "monitor.h"
Tuong Lienb4b97712018-12-19 09:17:56 +070046#include "trace.h"
Tuong Lienfc1b6d62019-11-08 12:05:11 +070047#include "crypto.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010048
Ying Xue796c75d2013-06-17 10:54:48 -040049#include <linux/pkt_sched.h>
50
Jon Paul Maloy38206d52015-11-19 14:30:46 -050051struct tipc_stats {
Jon Paul Maloy95901122016-11-25 10:35:02 -050052 u32 sent_pkts;
53 u32 recv_pkts;
Jon Paul Maloy38206d52015-11-19 14:30:46 -050054 u32 sent_states;
55 u32 recv_states;
56 u32 sent_probes;
57 u32 recv_probes;
58 u32 sent_nacks;
59 u32 recv_nacks;
60 u32 sent_acks;
61 u32 sent_bundled;
62 u32 sent_bundles;
63 u32 recv_bundled;
64 u32 recv_bundles;
65 u32 retransmitted;
66 u32 sent_fragmented;
67 u32 sent_fragments;
68 u32 recv_fragmented;
69 u32 recv_fragments;
70 u32 link_congs; /* # port sends blocked by congestion */
71 u32 deferred_recv;
72 u32 duplicates;
73 u32 max_queue_sz; /* send queue size high water mark */
74 u32 accu_queue_sz; /* used for send queue size profiling */
75 u32 queue_sz_counts; /* used for send queue size profiling */
76 u32 msg_length_counts; /* used for message length profiling */
77 u32 msg_lengths_total; /* used for message length profiling */
78 u32 msg_length_profile[7]; /* used for msg. length profiling */
79};
80
81/**
82 * struct tipc_link - TIPC link data structure
83 * @addr: network address of link's peer node
84 * @name: link name character string
85 * @media_addr: media address to use when sending messages over link
86 * @timer: link timer
87 * @net: pointer to namespace struct
88 * @refcnt: reference counter for permanent references (owner node & timer)
89 * @peer_session: link session # being used by peer end of link
90 * @peer_bearer_id: bearer id used by link's peer endpoint
91 * @bearer_id: local bearer id used by link
92 * @tolerance: minimum link continuity loss needed to reset link [in ms]
Jon Paul Maloy38206d52015-11-19 14:30:46 -050093 * @abort_limit: # of unacknowledged continuity probes needed to reset link
94 * @state: current state of link FSM
95 * @peer_caps: bitmap describing capabilities of peer node
96 * @silent_intv_cnt: # of timer intervals without any reception from peer
97 * @proto_msg: template for control messages generated by link
98 * @pmsg: convenience pointer to "proto_msg" field
99 * @priority: current link priority
100 * @net_plane: current link network plane ('A' through 'H')
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400101 * @mon_state: cookie with information needed by link monitor
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500102 * @backlog_limit: backlog queue congestion thresholds (indexed by importance)
103 * @exp_msg_count: # of tunnelled messages expected during link changeover
104 * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
105 * @mtu: current maximum packet size for this link
106 * @advertised_mtu: advertised own mtu when link is being established
107 * @transmitq: queue for sent, non-acked messages
108 * @backlogq: queue for messages waiting to be sent
109 * @snt_nxt: next sequence number to use for outbound messages
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500110 * @ackers: # of peers that needs to ack each packet before it can be released
111 * @acked: # last packet acked by a certain peer. Used for broadcast.
112 * @rcv_nxt: next sequence number to expect for inbound messages
113 * @deferred_queue: deferred queue saved OOS b'cast message received from node
114 * @unacked_window: # of inbound messages rx'd without ack'ing back to peer
115 * @inputq: buffer queue for messages to be delivered upwards
116 * @namedq: buffer queue for name table messages to be delivered upwards
117 * @next_out: ptr to first unsent outbound message in queue
118 * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate
119 * @long_msg_seq_no: next identifier to use for outbound fragmented messages
120 * @reasm_buf: head of partially reassembled inbound message fragments
121 * @bc_rcvr: marks that this is a broadcast receiver link
122 * @stats: collects statistics regarding link activity
Randy Dunlapa99df442020-11-29 10:32:44 -0800123 * @session: session to be used by link
124 * @snd_nxt_state: next send seq number
125 * @rcv_nxt_state: next rcv seq number
126 * @in_session: have received ACTIVATE_MSG from peer
127 * @active: link is active
128 * @if_name: associated interface name
129 * @rst_cnt: link reset counter
130 * @drop_point: seq number for failover handling (FIXME)
131 * @failover_reasm_skb: saved failover msg ptr (FIXME)
132 * @failover_deferdq: deferred message queue for failover processing (FIXME)
133 * @transmq: the link's transmit queue
134 * @backlog: link's backlog by priority (importance)
135 * @snd_nxt: next sequence number to be used
136 * @rcv_unacked: # messages read by user, but not yet acked back to peer
137 * @deferdq: deferred receive queue
138 * @window: sliding window size for congestion handling
139 * @min_win: minimal send window to be used by link
140 * @ssthresh: slow start threshold for congestion handling
141 * @max_win: maximal send window to be used by link
142 * @cong_acks: congestion acks for congestion avoidance (FIXME)
143 * @checkpoint: seq number for congestion window size handling
144 * @reasm_tnlmsg: fragmentation/reassembly area for tunnel protocol message
145 * @last_gap: last gap ack blocks for bcast (FIXME)
146 * @last_ga: ptr to gap ack blocks
147 * @bc_rcvlink: the peer specific link used for broadcast reception
148 * @bc_sndlink: the namespace global link used for broadcast sending
149 * @nack_state: bcast nack state
150 * @bc_peer_is_up: peer has acked the bcast init msg
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500151 */
152struct tipc_link {
153 u32 addr;
154 char name[TIPC_MAX_LINK_NAME];
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500155 struct net *net;
156
157 /* Management and link supervision data */
Jon Maloy7ea817f2018-07-10 01:07:36 +0200158 u16 peer_session;
159 u16 session;
Jon Maloy9012de52018-07-10 01:07:35 +0200160 u16 snd_nxt_state;
161 u16 rcv_nxt_state;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500162 u32 peer_bearer_id;
163 u32 bearer_id;
164 u32 tolerance;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500165 u32 abort_limit;
166 u32 state;
167 u16 peer_caps;
Jon Maloy7ea817f2018-07-10 01:07:36 +0200168 bool in_session;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500169 bool active;
170 u32 silent_intv_cnt;
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500171 char if_name[TIPC_MAX_IF_NAME];
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500172 u32 priority;
173 char net_plane;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400174 struct tipc_mon_state mon_state;
Jon Paul Maloy88e8ac72016-04-15 13:33:04 -0400175 u16 rst_cnt;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500176
177 /* Failover/synch */
178 u16 drop_point;
179 struct sk_buff *failover_reasm_skb;
Tuong Lien58ee86b2019-04-04 11:09:53 +0700180 struct sk_buff_head failover_deferdq;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500181
182 /* Max packet negotiation */
183 u16 mtu;
184 u16 advertised_mtu;
185
186 /* Sending */
187 struct sk_buff_head transmq;
188 struct sk_buff_head backlogq;
189 struct {
190 u16 len;
191 u16 limit;
Tuong Liene95584a2019-10-02 18:49:43 +0700192 struct sk_buff *target_bskb;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500193 } backlog[5];
194 u16 snd_nxt;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500195
196 /* Reception */
197 u16 rcv_nxt;
198 u32 rcv_unacked;
199 struct sk_buff_head deferdq;
200 struct sk_buff_head *inputq;
201 struct sk_buff_head *namedq;
202
203 /* Congestion handling */
204 struct sk_buff_head wakeupq;
Jon Maloy16ad3f42019-12-10 00:52:46 +0100205 u16 window;
206 u16 min_win;
207 u16 ssthresh;
208 u16 max_win;
209 u16 cong_acks;
210 u16 checkpoint;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500211
212 /* Fragmentation/reassembly */
213 struct sk_buff *reasm_buf;
Tuong Lien2320bcd2019-07-24 08:56:12 +0700214 struct sk_buff *reasm_tnlmsg;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500215
216 /* Broadcast */
217 u16 ackers;
218 u16 acked;
Tuong Liend7626b52020-05-26 16:38:34 +0700219 u16 last_gap;
220 struct tipc_gap_ack_blks *last_ga;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500221 struct tipc_link *bc_rcvlink;
222 struct tipc_link *bc_sndlink;
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -0400223 u8 nack_state;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500224 bool bc_peer_is_up;
225
226 /* Statistics */
227 struct tipc_stats stats;
228};
229
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400230/*
231 * Error message prefixes
232 */
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400233static const char *link_co_err = "Link tunneling error, ";
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400234static const char *link_rst_msg = "Resetting link ";
Richard Alpe7be57fc2014-11-20 10:29:12 +0100235
Jon Paul Maloy52666982015-10-22 08:51:41 -0400236/* Send states for broadcast NACKs
237 */
238enum {
239 BC_NACK_SND_CONDITIONAL,
240 BC_NACK_SND_UNCONDITIONAL,
241 BC_NACK_SND_SUPPRESS,
242};
243
Jon Maloy53962bc2019-06-28 17:06:20 +0200244#define TIPC_BC_RETR_LIM (jiffies + msecs_to_jiffies(10))
Tuong Lien382f5982019-04-04 11:09:52 +0700245#define TIPC_UC_RETR_TIME (jiffies + msecs_to_jiffies(1))
Jon Paul Maloy7c4a54b2016-09-01 13:52:50 -0400246
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400247/* Link FSM states:
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400248 */
249enum {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400250 LINK_ESTABLISHED = 0xe,
251 LINK_ESTABLISHING = 0xe << 4,
252 LINK_RESET = 0x1 << 8,
253 LINK_RESETTING = 0x2 << 12,
254 LINK_PEER_RESET = 0xd << 16,
255 LINK_FAILINGOVER = 0xf << 20,
256 LINK_SYNCHING = 0xc << 24
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400257};
258
259/* Link FSM state checking routines
260 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400261static int link_is_up(struct tipc_link *l)
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400262{
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400263 return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
Jon Paul Maloyd3504c32015-07-16 16:54:25 -0400264}
265
Jon Paul Maloyd9992972015-07-16 16:54:31 -0400266static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
267 struct sk_buff_head *xmitq);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -0400268static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
Jon Maloy8d6e79d2017-11-08 09:59:26 +0100269 bool probe_reply, u16 rcvgap,
270 int tolerance, int priority,
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -0400271 struct sk_buff_head *xmitq);
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500272static void link_print(struct tipc_link *l, const char *str);
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -0400273static int tipc_link_build_nack_msg(struct tipc_link *l,
274 struct sk_buff_head *xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400275static void tipc_link_build_bc_init_msg(struct tipc_link *l,
276 struct sk_buff_head *xmitq);
Tuong Liend7626b52020-05-26 16:38:34 +0700277static u8 __tipc_build_gap_ack_blks(struct tipc_gap_ack_blks *ga,
278 struct tipc_link *l, u8 start_index);
279static u16 tipc_build_gap_ack_blks(struct tipc_link *l, struct tipc_msg *hdr);
280static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r,
281 u16 acked, u16 gap,
Tuong Lien6a6b5c82019-06-17 12:15:42 +0700282 struct tipc_gap_ack_blks *ga,
Tuong Liend7626b52020-05-26 16:38:34 +0700283 struct sk_buff_head *xmitq,
284 bool *retransmitted, int *rc);
Jon Maloy16ad3f42019-12-10 00:52:46 +0100285static void tipc_link_update_cwin(struct tipc_link *l, int released,
286 bool retransmitted);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100287/*
Sam Ravnborg05790c62006-03-20 22:37:04 -0800288 * Simple non-static link routines (i.e. referenced outside this file)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100289 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400290bool tipc_link_is_up(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100291{
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400292 return link_is_up(l);
293}
294
Jon Paul Maloyc8199302015-10-15 14:52:46 -0400295bool tipc_link_peer_is_down(struct tipc_link *l)
296{
297 return l->state == LINK_PEER_RESET;
298}
299
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400300bool tipc_link_is_reset(struct tipc_link *l)
301{
302 return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
303}
304
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400305bool tipc_link_is_establishing(struct tipc_link *l)
306{
307 return l->state == LINK_ESTABLISHING;
308}
309
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400310bool tipc_link_is_synching(struct tipc_link *l)
311{
312 return l->state == LINK_SYNCHING;
313}
314
315bool tipc_link_is_failingover(struct tipc_link *l)
316{
317 return l->state == LINK_FAILINGOVER;
318}
319
320bool tipc_link_is_blocked(struct tipc_link *l)
321{
322 return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100323}
324
Wu Fengguang742e0382015-10-24 22:56:01 +0800325static bool link_is_bc_sndlink(struct tipc_link *l)
Jon Paul Maloy52666982015-10-22 08:51:41 -0400326{
327 return !l->bc_sndlink;
328}
329
Wu Fengguang742e0382015-10-24 22:56:01 +0800330static bool link_is_bc_rcvlink(struct tipc_link *l)
Jon Paul Maloy52666982015-10-22 08:51:41 -0400331{
332 return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l));
333}
334
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400335void tipc_link_set_active(struct tipc_link *l, bool active)
336{
337 l->active = active;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100338}
339
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500340u32 tipc_link_id(struct tipc_link *l)
341{
342 return l->peer_bearer_id << 16 | l->bearer_id;
343}
344
Jon Maloy16ad3f42019-12-10 00:52:46 +0100345int tipc_link_min_win(struct tipc_link *l)
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500346{
Jon Maloy16ad3f42019-12-10 00:52:46 +0100347 return l->min_win;
348}
349
350int tipc_link_max_win(struct tipc_link *l)
351{
352 return l->max_win;
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500353}
354
355int tipc_link_prio(struct tipc_link *l)
356{
357 return l->priority;
358}
359
360unsigned long tipc_link_tolerance(struct tipc_link *l)
361{
362 return l->tolerance;
363}
364
365struct sk_buff_head *tipc_link_inputq(struct tipc_link *l)
366{
367 return l->inputq;
368}
369
370char tipc_link_plane(struct tipc_link *l)
371{
372 return l->net_plane;
373}
374
Jon Maloy9012de52018-07-10 01:07:35 +0200375void tipc_link_update_caps(struct tipc_link *l, u16 capabilities)
376{
377 l->peer_caps = capabilities;
378}
379
Jon Paul Maloy52666982015-10-22 08:51:41 -0400380void tipc_link_add_bc_peer(struct tipc_link *snd_l,
381 struct tipc_link *uc_l,
382 struct sk_buff_head *xmitq)
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400383{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400384 struct tipc_link *rcv_l = uc_l->bc_rcvlink;
385
386 snd_l->ackers++;
387 rcv_l->acked = snd_l->snd_nxt - 1;
Jon Paul Maloy9a650832015-11-19 14:12:50 -0500388 snd_l->state = LINK_ESTABLISHED;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400389 tipc_link_build_bc_init_msg(uc_l, xmitq);
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400390}
391
Jon Paul Maloy52666982015-10-22 08:51:41 -0400392void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
393 struct tipc_link *rcv_l,
394 struct sk_buff_head *xmitq)
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400395{
Jon Paul Maloy52666982015-10-22 08:51:41 -0400396 u16 ack = snd_l->snd_nxt - 1;
397
398 snd_l->ackers--;
Jon Paul Maloya71eb722016-07-11 16:08:36 -0400399 rcv_l->bc_peer_is_up = true;
400 rcv_l->state = LINK_ESTABLISHED;
Tuong Liena91d55d2020-05-26 16:38:36 +0700401 tipc_link_bc_ack_rcv(rcv_l, ack, 0, NULL, xmitq, NULL);
Tuong Lien26574db2018-12-19 09:17:57 +0700402 trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!");
Jon Paul Maloy52666982015-10-22 08:51:41 -0400403 tipc_link_reset(rcv_l);
404 rcv_l->state = LINK_RESET;
405 if (!snd_l->ackers) {
Tuong Lien26574db2018-12-19 09:17:57 +0700406 trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!");
Jon Paul Maloy52666982015-10-22 08:51:41 -0400407 tipc_link_reset(snd_l);
Jon Paul Maloy9a650832015-11-19 14:12:50 -0500408 snd_l->state = LINK_RESET;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400409 __skb_queue_purge(xmitq);
410 }
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400411}
412
413int tipc_link_bc_peers(struct tipc_link *l)
414{
415 return l->ackers;
416}
417
YueHaibinge064cce2018-07-19 17:16:59 +0800418static u16 link_bc_rcv_gap(struct tipc_link *l)
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -0400419{
420 struct sk_buff *skb = skb_peek(&l->deferdq);
421 u16 gap = 0;
422
423 if (more(l->snd_nxt, l->rcv_nxt))
424 gap = l->snd_nxt - l->rcv_nxt;
425 if (skb)
426 gap = buf_seqno(skb) - l->rcv_nxt;
427 return gap;
428}
429
Jon Paul Maloy959e1782015-10-22 08:51:43 -0400430void tipc_link_set_mtu(struct tipc_link *l, int mtu)
431{
432 l->mtu = mtu;
433}
434
435int tipc_link_mtu(struct tipc_link *l)
436{
437 return l->mtu;
438}
439
Tuong Lienfc1b6d62019-11-08 12:05:11 +0700440int tipc_link_mss(struct tipc_link *l)
441{
442#ifdef CONFIG_TIPC_CRYPTO
443 return l->mtu - INT_H_SIZE - EMSG_OVERHEAD;
444#else
445 return l->mtu - INT_H_SIZE;
446#endif
447}
448
Jon Paul Maloy38206d52015-11-19 14:30:46 -0500449u16 tipc_link_rcv_nxt(struct tipc_link *l)
450{
451 return l->rcv_nxt;
452}
453
454u16 tipc_link_acked(struct tipc_link *l)
455{
456 return l->acked;
457}
458
459char *tipc_link_name(struct tipc_link *l)
460{
461 return l->name;
462}
463
LUU Duc Canhc140eb12018-09-26 21:00:54 +0200464u32 tipc_link_state(struct tipc_link *l)
465{
466 return l->state;
467}
468
Per Lidenb97bf3f2006-01-02 19:04:38 +0100469/**
Per Liden4323add2006-01-18 00:38:21 +0100470 * tipc_link_create - create a new link
Andrew Lunnd8141202020-07-13 01:15:14 +0200471 * @net: pointer to associated network namespace
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400472 * @if_name: associated interface name
473 * @bearer_id: id (index) of associated bearer
474 * @tolerance: link tolerance to be used by link
475 * @net_plane: network plane (A,B,c..) this link belongs to
476 * @mtu: mtu to be advertised by link
477 * @priority: priority to be used by link
Jon Maloy16ad3f42019-12-10 00:52:46 +0100478 * @min_win: minimal send window to be used by link
479 * @max_win: maximal send window to be used by link
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400480 * @session: session to be used by link
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400481 * @peer: node id of peer node
Jon Paul Maloyfd556f22015-10-22 08:51:40 -0400482 * @peer_caps: bitmap describing peer node capabilities
Jon Paul Maloy52666982015-10-22 08:51:41 -0400483 * @bc_sndlink: the namespace global link used for broadcast sending
484 * @bc_rcvlink: the peer specific link used for broadcast reception
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400485 * @inputq: queue to put messages ready for delivery
486 * @namedq: queue to put binding table update messages ready for delivery
487 * @link: return value, pointer to put the created link
Randy Dunlapa99df442020-11-29 10:32:44 -0800488 * @self: local unicast link id
489 * @peer_id: 128-bit ID of peer
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900490 *
Randy Dunlap637b77f2020-11-29 10:32:48 -0800491 * Return: true if link was created, otherwise false
Per Lidenb97bf3f2006-01-02 19:04:38 +0100492 */
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400493bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400494 int tolerance, char net_plane, u32 mtu, int priority,
Jon Maloy16ad3f42019-12-10 00:52:46 +0100495 u32 min_win, u32 max_win, u32 session, u32 self,
Jon Maloy25b0b9c2018-03-22 20:42:51 +0100496 u32 peer, u8 *peer_id, u16 peer_caps,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400497 struct tipc_link *bc_sndlink,
498 struct tipc_link *bc_rcvlink,
499 struct sk_buff_head *inputq,
500 struct sk_buff_head *namedq,
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400501 struct tipc_link **link)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100502{
Jon Maloy25b0b9c2018-03-22 20:42:51 +0100503 char peer_str[NODE_ID_STR_LEN] = {0,};
504 char self_str[NODE_ID_STR_LEN] = {0,};
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400505 struct tipc_link *l;
Allan Stephens37b9c082011-02-28 11:32:27 -0500506
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400507 l = kzalloc(sizeof(*l), GFP_ATOMIC);
508 if (!l)
509 return false;
510 *link = l;
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500511 l->session = session;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400512
Jon Maloy25b0b9c2018-03-22 20:42:51 +0100513 /* Set link name for unicast links only */
514 if (peer_id) {
515 tipc_nodeid2string(self_str, tipc_own_id(net));
516 if (strlen(self_str) > 16)
517 sprintf(self_str, "%x", self);
518 tipc_nodeid2string(peer_str, peer_id);
519 if (strlen(peer_str) > 16)
520 sprintf(peer_str, "%x", peer);
521 }
522 /* Peer i/f name will be completed by reset/activate message */
Jon Maloy7494cfa2018-03-29 23:20:45 +0200523 snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown",
524 self_str, if_name, peer_str);
Jon Maloy25b0b9c2018-03-22 20:42:51 +0100525
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500526 strcpy(l->if_name, if_name);
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400527 l->addr = peer;
Jon Paul Maloyfd556f22015-10-22 08:51:40 -0400528 l->peer_caps = peer_caps;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -0400529 l->net = net;
Jon Maloy7ea817f2018-07-10 01:07:36 +0200530 l->in_session = false;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400531 l->bearer_id = bearer_id;
532 l->tolerance = tolerance;
Jon Maloy047491e2018-10-10 17:34:01 +0200533 if (bc_rcvlink)
534 bc_rcvlink->tolerance = tolerance;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400535 l->net_plane = net_plane;
536 l->advertised_mtu = mtu;
537 l->mtu = mtu;
538 l->priority = priority;
Jon Maloy16ad3f42019-12-10 00:52:46 +0100539 tipc_link_set_queue_limits(l, min_win, max_win);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -0400540 l->ackers = 1;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400541 l->bc_sndlink = bc_sndlink;
542 l->bc_rcvlink = bc_rcvlink;
Jon Paul Maloy0e054982015-10-22 08:51:36 -0400543 l->inputq = inputq;
544 l->namedq = namedq;
545 l->state = LINK_RESETTING;
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400546 __skb_queue_head_init(&l->transmq);
547 __skb_queue_head_init(&l->backlogq);
548 __skb_queue_head_init(&l->deferdq);
Tuong Lien58ee86b2019-04-04 11:09:53 +0700549 __skb_queue_head_init(&l->failover_deferdq);
Jon Paul Maloy440d8962015-07-30 18:24:26 -0400550 skb_queue_head_init(&l->wakeupq);
551 skb_queue_head_init(l->inputq);
552 return true;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100553}
554
Jon Paul Maloy32301902015-10-22 08:51:37 -0400555/**
556 * tipc_link_bc_create - create new link to be used for broadcast
Andrew Lunnd8141202020-07-13 01:15:14 +0200557 * @net: pointer to associated network namespace
Jon Maloy4c94cc22017-11-30 16:47:25 +0100558 * @mtu: mtu to be used initially if no peers
Lu Wei2e5117b2020-09-15 10:39:55 +0800559 * @min_win: minimal send window to be used by link
560 * @max_win: maximal send window to be used by link
Jon Paul Maloy32301902015-10-22 08:51:37 -0400561 * @inputq: queue to put messages ready for delivery
562 * @namedq: queue to put binding table update messages ready for delivery
563 * @link: return value, pointer to put the created link
Randy Dunlapa99df442020-11-29 10:32:44 -0800564 * @ownnode: identity of own node
565 * @peer: node id of peer node
566 * @peer_id: 128-bit ID of peer
567 * @peer_caps: bitmap describing peer node capabilities
568 * @bc_sndlink: the namespace global link used for broadcast sending
Jon Paul Maloy32301902015-10-22 08:51:37 -0400569 *
Randy Dunlap637b77f2020-11-29 10:32:48 -0800570 * Return: true if link was created, otherwise false
Jon Paul Maloy32301902015-10-22 08:51:37 -0400571 */
Tuong Lien03b6fef2020-05-26 16:38:37 +0700572bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, u8 *peer_id,
Jon Maloy16ad3f42019-12-10 00:52:46 +0100573 int mtu, u32 min_win, u32 max_win, u16 peer_caps,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400574 struct sk_buff_head *inputq,
575 struct sk_buff_head *namedq,
Jon Paul Maloy52666982015-10-22 08:51:41 -0400576 struct tipc_link *bc_sndlink,
Jon Paul Maloy32301902015-10-22 08:51:37 -0400577 struct tipc_link **link)
578{
579 struct tipc_link *l;
580
Jon Maloy16ad3f42019-12-10 00:52:46 +0100581 if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, min_win,
582 max_win, 0, ownnode, peer, NULL, peer_caps,
583 bc_sndlink, NULL, inputq, namedq, link))
Jon Paul Maloy32301902015-10-22 08:51:37 -0400584 return false;
585
586 l = *link;
Tuong Lien03b6fef2020-05-26 16:38:37 +0700587 if (peer_id) {
588 char peer_str[NODE_ID_STR_LEN] = {0,};
589
590 tipc_nodeid2string(peer_str, peer_id);
591 if (strlen(peer_str) > 16)
592 sprintf(peer_str, "%x", peer);
593 /* Broadcast receiver link name: "broadcast-link:<peer>" */
594 snprintf(l->name, sizeof(l->name), "%s:%s", tipc_bclink_name,
595 peer_str);
596 } else {
597 strcpy(l->name, tipc_bclink_name);
598 }
Tuong Lien26574db2018-12-19 09:17:57 +0700599 trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!");
Jon Paul Maloy32301902015-10-22 08:51:37 -0400600 tipc_link_reset(l);
Jon Paul Maloy52666982015-10-22 08:51:41 -0400601 l->state = LINK_RESET;
Jon Paul Maloy2f566122015-10-22 08:51:39 -0400602 l->ackers = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400603 l->bc_rcvlink = l;
604
605 /* Broadcast send link is always up */
606 if (link_is_bc_sndlink(l))
607 l->state = LINK_ESTABLISHED;
608
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500609 /* Disable replicast if even a single peer doesn't support it */
610 if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST))
Hoang Leba5f6a82019-11-21 10:01:09 +0700611 tipc_bcast_toggle_rcast(net, false);
Jon Paul Maloy01fd12b2017-01-18 13:50:53 -0500612
Jon Paul Maloy32301902015-10-22 08:51:37 -0400613 return true;
614}
615
Per Lidenb97bf3f2006-01-02 19:04:38 +0100616/**
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400617 * tipc_link_fsm_evt - link finite state machine
618 * @l: pointer to link
619 * @evt: state machine event to be processed
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400620 */
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400621int tipc_link_fsm_evt(struct tipc_link *l, int evt)
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400622{
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400623 int rc = 0;
Tuong Lien26574db2018-12-19 09:17:57 +0700624 int old_state = l->state;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400625
626 switch (l->state) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400627 case LINK_RESETTING:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400628 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400629 case LINK_PEER_RESET_EVT:
630 l->state = LINK_PEER_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400631 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400632 case LINK_RESET_EVT:
633 l->state = LINK_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400634 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400635 case LINK_FAILURE_EVT:
636 case LINK_FAILOVER_BEGIN_EVT:
637 case LINK_ESTABLISH_EVT:
638 case LINK_FAILOVER_END_EVT:
639 case LINK_SYNCH_BEGIN_EVT:
640 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400641 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400642 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400643 }
644 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400645 case LINK_RESET:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400646 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400647 case LINK_PEER_RESET_EVT:
648 l->state = LINK_ESTABLISHING;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400649 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400650 case LINK_FAILOVER_BEGIN_EVT:
651 l->state = LINK_FAILINGOVER;
652 case LINK_FAILURE_EVT:
653 case LINK_RESET_EVT:
654 case LINK_ESTABLISH_EVT:
655 case LINK_FAILOVER_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400656 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400657 case LINK_SYNCH_BEGIN_EVT:
658 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400659 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400660 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400661 }
662 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400663 case LINK_PEER_RESET:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400664 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400665 case LINK_RESET_EVT:
666 l->state = LINK_ESTABLISHING;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400667 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400668 case LINK_PEER_RESET_EVT:
669 case LINK_ESTABLISH_EVT:
670 case LINK_FAILURE_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400671 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400672 case LINK_SYNCH_BEGIN_EVT:
673 case LINK_SYNCH_END_EVT:
674 case LINK_FAILOVER_BEGIN_EVT:
675 case LINK_FAILOVER_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400676 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400677 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400678 }
679 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400680 case LINK_FAILINGOVER:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400681 switch (evt) {
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400682 case LINK_FAILOVER_END_EVT:
683 l->state = LINK_RESET;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400684 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400685 case LINK_PEER_RESET_EVT:
686 case LINK_RESET_EVT:
687 case LINK_ESTABLISH_EVT:
688 case LINK_FAILURE_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400689 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400690 case LINK_FAILOVER_BEGIN_EVT:
691 case LINK_SYNCH_BEGIN_EVT:
692 case LINK_SYNCH_END_EVT:
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400693 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400694 goto illegal_evt;
695 }
696 break;
697 case LINK_ESTABLISHING:
698 switch (evt) {
699 case LINK_ESTABLISH_EVT:
700 l->state = LINK_ESTABLISHED;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400701 break;
702 case LINK_FAILOVER_BEGIN_EVT:
703 l->state = LINK_FAILINGOVER;
704 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400705 case LINK_RESET_EVT:
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400706 l->state = LINK_RESET;
707 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400708 case LINK_FAILURE_EVT:
Jon Paul Maloy73f646c2015-10-15 14:52:44 -0400709 case LINK_PEER_RESET_EVT:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400710 case LINK_SYNCH_BEGIN_EVT:
711 case LINK_FAILOVER_END_EVT:
712 break;
713 case LINK_SYNCH_END_EVT:
714 default:
715 goto illegal_evt;
716 }
717 break;
718 case LINK_ESTABLISHED:
719 switch (evt) {
720 case LINK_PEER_RESET_EVT:
721 l->state = LINK_PEER_RESET;
722 rc |= TIPC_LINK_DOWN_EVT;
723 break;
724 case LINK_FAILURE_EVT:
725 l->state = LINK_RESETTING;
726 rc |= TIPC_LINK_DOWN_EVT;
727 break;
728 case LINK_RESET_EVT:
729 l->state = LINK_RESET;
730 break;
731 case LINK_ESTABLISH_EVT:
Jon Paul Maloy5ae2f8e2015-08-20 02:12:55 -0400732 case LINK_SYNCH_END_EVT:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400733 break;
734 case LINK_SYNCH_BEGIN_EVT:
735 l->state = LINK_SYNCHING;
736 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400737 case LINK_FAILOVER_BEGIN_EVT:
738 case LINK_FAILOVER_END_EVT:
739 default:
740 goto illegal_evt;
741 }
742 break;
743 case LINK_SYNCHING:
744 switch (evt) {
745 case LINK_PEER_RESET_EVT:
746 l->state = LINK_PEER_RESET;
747 rc |= TIPC_LINK_DOWN_EVT;
748 break;
749 case LINK_FAILURE_EVT:
750 l->state = LINK_RESETTING;
751 rc |= TIPC_LINK_DOWN_EVT;
752 break;
753 case LINK_RESET_EVT:
754 l->state = LINK_RESET;
755 break;
756 case LINK_ESTABLISH_EVT:
757 case LINK_SYNCH_BEGIN_EVT:
758 break;
759 case LINK_SYNCH_END_EVT:
760 l->state = LINK_ESTABLISHED;
761 break;
762 case LINK_FAILOVER_BEGIN_EVT:
763 case LINK_FAILOVER_END_EVT:
764 default:
765 goto illegal_evt;
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400766 }
767 break;
768 default:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400769 pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400770 }
Tuong Lien26574db2018-12-19 09:17:57 +0700771 trace_tipc_link_fsm(l->name, old_state, l->state, evt);
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400772 return rc;
773illegal_evt:
774 pr_err("Illegal FSM event %x in state %x on link %s\n",
775 evt, l->state, l->name);
Tuong Lien26574db2018-12-19 09:17:57 +0700776 trace_tipc_link_fsm(l->name, old_state, l->state, evt);
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400777 return rc;
778}
779
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400780/* link_profile_stats - update statistical profiling of traffic
781 */
782static void link_profile_stats(struct tipc_link *l)
783{
784 struct sk_buff *skb;
785 struct tipc_msg *msg;
786 int length;
787
788 /* Update counters used in statistical profiling of send traffic */
789 l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
790 l->stats.queue_sz_counts++;
791
792 skb = skb_peek(&l->transmq);
793 if (!skb)
794 return;
795 msg = buf_msg(skb);
796 length = msg_size(msg);
797
798 if (msg_user(msg) == MSG_FRAGMENTER) {
799 if (msg_type(msg) != FIRST_FRAGMENT)
800 return;
Jon Maloya7dc51a2019-06-25 19:37:00 +0200801 length = msg_size(msg_inner_hdr(msg));
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400802 }
803 l->stats.msg_lengths_total += length;
804 l->stats.msg_length_counts++;
805 if (length <= 64)
806 l->stats.msg_length_profile[0]++;
807 else if (length <= 256)
808 l->stats.msg_length_profile[1]++;
809 else if (length <= 1024)
810 l->stats.msg_length_profile[2]++;
811 else if (length <= 4096)
812 l->stats.msg_length_profile[3]++;
813 else if (length <= 16384)
814 l->stats.msg_length_profile[4]++;
815 else if (length <= 32768)
816 l->stats.msg_length_profile[5]++;
817 else
818 l->stats.msg_length_profile[6]++;
819}
820
Tuong Lien26574db2018-12-19 09:17:57 +0700821/**
822 * tipc_link_too_silent - check if link is "too silent"
823 * @l: tipc link to be checked
824 *
Randy Dunlap637b77f2020-11-29 10:32:48 -0800825 * Return: true if the link 'silent_intv_cnt' is about to reach the
Tuong Lien26574db2018-12-19 09:17:57 +0700826 * 'abort_limit' value, otherwise false
827 */
828bool tipc_link_too_silent(struct tipc_link *l)
829{
830 return (l->silent_intv_cnt + 2 > l->abort_limit);
831}
832
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400833/* tipc_link_timeout - perform periodic task as instructed from node timeout
834 */
835int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
836{
Ying Xuec91522f2016-06-15 14:11:31 +0800837 int mtyp = 0;
838 int rc = 0;
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400839 bool state = false;
840 bool probe = false;
841 bool setup = false;
Jon Paul Maloy52666982015-10-22 08:51:41 -0400842 u16 bc_snt = l->bc_sndlink->snd_nxt - 1;
843 u16 bc_acked = l->bc_rcvlink->acked;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400844 struct tipc_mon_state *mstate = &l->mon_state;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400845
Tuong Lien26574db2018-12-19 09:17:57 +0700846 trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " ");
847 trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " ");
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400848 switch (l->state) {
849 case LINK_ESTABLISHED:
850 case LINK_SYNCHING:
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400851 mtyp = STATE_MSG;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400852 link_profile_stats(l);
853 tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id);
854 if (mstate->reset || (l->silent_intv_cnt > l->abort_limit))
855 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400856 state = bc_acked != bc_snt;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400857 state |= l->bc_rcvlink->rcv_unacked;
858 state |= l->rcv_unacked;
859 state |= !skb_queue_empty(&l->transmq);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -0400860 probe = mstate->probing;
861 probe |= l->silent_intv_cnt;
862 if (probe || mstate->monitoring)
863 l->silent_intv_cnt++;
Tung Nguyen6ef9dcb2020-07-21 08:57:05 +0700864 probe |= !skb_queue_empty(&l->deferdq);
Jon Maloy16ad3f42019-12-10 00:52:46 +0100865 if (l->snd_nxt == l->checkpoint) {
866 tipc_link_update_cwin(l, 0, 0);
867 probe = true;
868 }
869 l->checkpoint = l->snd_nxt;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400870 break;
871 case LINK_RESET:
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400872 setup = l->rst_cnt++ <= 4;
873 setup |= !(l->rst_cnt % 16);
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400874 mtyp = RESET_MSG;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400875 break;
876 case LINK_ESTABLISHING:
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400877 setup = true;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400878 mtyp = ACTIVATE_MSG;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400879 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400880 case LINK_PEER_RESET:
Jon Paul Maloy598411d2015-07-30 18:24:23 -0400881 case LINK_RESETTING:
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400882 case LINK_FAILINGOVER:
883 break;
884 default:
885 break;
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400886 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -0400887
Jon Paul Maloy42b18f62016-04-15 13:33:05 -0400888 if (state || probe || setup)
Jon Maloy8d6e79d2017-11-08 09:59:26 +0100889 tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq);
Jon Paul Maloy5045f7b2015-07-30 18:24:20 -0400890
Jon Paul Maloy333ef692015-07-16 16:54:28 -0400891 return rc;
892}
893
Jon Paul Maloy6ab30f92015-07-16 16:54:27 -0400894/**
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400895 * link_schedule_user - schedule a message sender for wakeup after congestion
Jon Paul Maloy365ad352017-01-03 10:55:11 -0500896 * @l: congested link
897 * @hdr: header of message that is being sent
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400898 * Create pseudo msg to send back to user when congestion abates
Per Lidenb97bf3f2006-01-02 19:04:38 +0100899 */
Jon Paul Maloy365ad352017-01-03 10:55:11 -0500900static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100901{
Jon Paul Maloy365ad352017-01-03 10:55:11 -0500902 u32 dnode = tipc_own_addr(l->net);
903 u32 dport = msg_origport(hdr);
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400904 struct sk_buff *skb;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100905
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400906 /* Create and schedule wakeup pseudo message */
907 skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
Jon Paul Maloy365ad352017-01-03 10:55:11 -0500908 dnode, l->addr, dport, 0, 0);
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400909 if (!skb)
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400910 return -ENOBUFS;
Jon Paul Maloy365ad352017-01-03 10:55:11 -0500911 msg_set_dest_droppable(buf_msg(skb), true);
912 TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr);
913 skb_queue_tail(&l->wakeupq, skb);
914 l->stats.link_congs++;
Tuong Lien26574db2018-12-19 09:17:57 +0700915 trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!");
Jon Paul Maloy3127a022015-03-25 12:07:25 -0400916 return -ELINKCONG;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100917}
918
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400919/**
920 * link_prepare_wakeup - prepare users for wakeup after congestion
Jon Paul Maloy365ad352017-01-03 10:55:11 -0500921 * @l: congested link
922 * Wake up a number of waiting users, as permitted by available space
923 * in the send queue
Jon Paul Maloy50100a52014-08-22 18:09:07 -0400924 */
YueHaibinge064cce2018-07-19 17:16:59 +0800925static void link_prepare_wakeup(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100926{
Jon Maloy7c5b4202019-07-30 16:23:18 +0200927 struct sk_buff_head *wakeupq = &l->wakeupq;
928 struct sk_buff_head *inputq = l->inputq;
Ying Xue58d78b32014-11-26 11:41:51 +0800929 struct sk_buff *skb, *tmp;
Jon Maloy7c5b4202019-07-30 16:23:18 +0200930 struct sk_buff_head tmpq;
931 int avail[5] = {0,};
932 int imp = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100933
Jon Maloy7c5b4202019-07-30 16:23:18 +0200934 __skb_queue_head_init(&tmpq);
935
936 for (; imp <= TIPC_SYSTEM_IMPORTANCE; imp++)
937 avail[imp] = l->backlog[imp].limit - l->backlog[imp].len;
938
939 skb_queue_walk_safe(wakeupq, skb, tmp) {
Jon Paul Maloy1f66d162015-03-25 12:07:24 -0400940 imp = TIPC_SKB_CB(skb)->chain_imp;
Jon Maloy7c5b4202019-07-30 16:23:18 +0200941 if (avail[imp] <= 0)
942 continue;
943 avail[imp]--;
944 __skb_unlink(skb, wakeupq);
945 __skb_queue_tail(&tmpq, skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100946 }
Jon Maloy7c5b4202019-07-30 16:23:18 +0200947
948 spin_lock_bh(&inputq->lock);
949 skb_queue_splice_tail(&tmpq, inputq);
950 spin_unlock_bh(&inputq->lock);
951
Per Lidenb97bf3f2006-01-02 19:04:38 +0100952}
953
Hamish Martina34f8292020-07-09 09:06:44 +1200954/**
955 * tipc_link_set_skb_retransmit_time - set the time at which retransmission of
956 * the given skb should be next attempted
957 * @skb: skb to set a future retransmission time for
958 * @l: link the skb will be transmitted on
959 */
960static void tipc_link_set_skb_retransmit_time(struct sk_buff *skb,
961 struct tipc_link *l)
962{
963 if (link_is_bc_sndlink(l))
964 TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM;
965 else
966 TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME;
967}
968
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400969void tipc_link_reset(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100970{
Ying Xuea1f8dd32018-10-11 19:57:56 +0800971 struct sk_buff_head list;
Tuong Liene95584a2019-10-02 18:49:43 +0700972 u32 imp;
Ying Xuea1f8dd32018-10-11 19:57:56 +0800973
974 __skb_queue_head_init(&list);
975
Jon Maloy7ea817f2018-07-10 01:07:36 +0200976 l->in_session = false;
Tuong Lienf7a93782019-04-16 10:48:07 +0700977 /* Force re-synch of peer session number before establishing */
978 l->peer_session--;
Jon Paul Maloye74a3862016-03-03 14:23:21 -0500979 l->session++;
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400980 l->mtu = l->advertised_mtu;
Ying Xuea1f8dd32018-10-11 19:57:56 +0800981
Parthasarathy Bhuvaragan3f32d0b2018-09-25 22:09:10 +0200982 spin_lock_bh(&l->wakeupq.lock);
Ying Xuea1f8dd32018-10-11 19:57:56 +0800983 skb_queue_splice_init(&l->wakeupq, &list);
Parthasarathy Bhuvaragan3f32d0b2018-09-25 22:09:10 +0200984 spin_unlock_bh(&l->wakeupq.lock);
985
Ying Xuea1f8dd32018-10-11 19:57:56 +0800986 spin_lock_bh(&l->inputq->lock);
987 skb_queue_splice_init(&list, l->inputq);
988 spin_unlock_bh(&l->inputq->lock);
989
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400990 __skb_queue_purge(&l->transmq);
991 __skb_queue_purge(&l->deferdq);
Jon Paul Maloy2af5ae32015-10-22 08:51:48 -0400992 __skb_queue_purge(&l->backlogq);
Tuong Lien58ee86b2019-04-04 11:09:53 +0700993 __skb_queue_purge(&l->failover_deferdq);
Tuong Liene95584a2019-10-02 18:49:43 +0700994 for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) {
995 l->backlog[imp].len = 0;
996 l->backlog[imp].target_bskb = NULL;
997 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -0400998 kfree_skb(l->reasm_buf);
Tuong Lien2320bcd2019-07-24 08:56:12 +0700999 kfree_skb(l->reasm_tnlmsg);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001000 kfree_skb(l->failover_reasm_skb);
1001 l->reasm_buf = NULL;
Tuong Lien2320bcd2019-07-24 08:56:12 +07001002 l->reasm_tnlmsg = NULL;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001003 l->failover_reasm_skb = NULL;
1004 l->rcv_unacked = 0;
1005 l->snd_nxt = 1;
1006 l->rcv_nxt = 1;
Jon Maloy9012de52018-07-10 01:07:35 +02001007 l->snd_nxt_state = 1;
1008 l->rcv_nxt_state = 1;
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001009 l->acked = 0;
Tuong Liend7626b52020-05-26 16:38:34 +07001010 l->last_gap = 0;
1011 kfree(l->last_ga);
1012 l->last_ga = NULL;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001013 l->silent_intv_cnt = 0;
Jon Paul Maloy88e8ac72016-04-15 13:33:04 -04001014 l->rst_cnt = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001015 l->bc_peer_is_up = false;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001016 memset(&l->mon_state, 0, sizeof(l->mon_state));
Jon Paul Maloy38206d52015-11-19 14:30:46 -05001017 tipc_link_reset_stats(l);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001018}
1019
Per Lidenb97bf3f2006-01-02 19:04:38 +01001020/**
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001021 * tipc_link_xmit(): enqueue buffer list according to queue situation
Andrew Lunnd8141202020-07-13 01:15:14 +02001022 * @l: link to use
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001023 * @list: chain of buffers containing message
1024 * @xmitq: returned list of packets to be sent by caller
1025 *
Jon Paul Maloy365ad352017-01-03 10:55:11 -05001026 * Consumes the buffer chain.
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001027 * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
Randy Dunlap637b77f2020-11-29 10:32:48 -08001028 * Return: 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001029 */
1030int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
1031 struct sk_buff_head *xmitq)
1032{
1033 struct tipc_msg *hdr = buf_msg(skb_peek(list));
Tuong Lien06e7c702019-11-01 09:58:57 +07001034 struct sk_buff_head *backlogq = &l->backlogq;
1035 struct sk_buff_head *transmq = &l->transmq;
1036 struct sk_buff *skb, *_skb;
1037 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001038 u16 ack = l->rcv_nxt - 1;
1039 u16 seqno = l->snd_nxt;
Jon Paul Maloy95901122016-11-25 10:35:02 -05001040 int pkt_cnt = skb_queue_len(list);
Tuong Lien06e7c702019-11-01 09:58:57 +07001041 int imp = msg_importance(hdr);
Tuong Lienfc1b6d62019-11-08 12:05:11 +07001042 unsigned int mss = tipc_link_mss(l);
Jon Maloy16ad3f42019-12-10 00:52:46 +01001043 unsigned int cwin = l->window;
Tuong Lien06e7c702019-11-01 09:58:57 +07001044 unsigned int mtu = l->mtu;
1045 bool new_bundle;
Jon Paul Maloy365ad352017-01-03 10:55:11 -05001046 int rc = 0;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001047
Richard Alpe4952cd32016-02-11 10:43:15 +01001048 if (unlikely(msg_size(hdr) > mtu)) {
Tuong Lien2320bcd2019-07-24 08:56:12 +07001049 pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n",
1050 skb_queue_len(list), msg_user(hdr),
1051 msg_type(hdr), msg_size(hdr), mtu);
Jon Maloye654f9f2019-08-15 16:42:50 +02001052 __skb_queue_purge(list);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001053 return -EMSGSIZE;
Richard Alpe4952cd32016-02-11 10:43:15 +01001054 }
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001055
Jon Paul Maloy365ad352017-01-03 10:55:11 -05001056 /* Allow oversubscription of one data msg per source at congestion */
1057 if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) {
1058 if (imp == TIPC_SYSTEM_IMPORTANCE) {
1059 pr_warn("%s<%s>, link overflow", link_rst_msg, l->name);
1060 return -ENOBUFS;
1061 }
1062 rc = link_schedule_user(l, hdr);
1063 }
1064
Jon Paul Maloy95901122016-11-25 10:35:02 -05001065 if (pkt_cnt > 1) {
1066 l->stats.sent_fragmented++;
1067 l->stats.sent_fragments += pkt_cnt;
1068 }
1069
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001070 /* Prepare each packet for sending, and add to relevant queue: */
Tuong Lien06e7c702019-11-01 09:58:57 +07001071 while ((skb = __skb_dequeue(list))) {
Jon Maloy16ad3f42019-12-10 00:52:46 +01001072 if (likely(skb_queue_len(transmq) < cwin)) {
Tuong Lien06e7c702019-11-01 09:58:57 +07001073 hdr = buf_msg(skb);
1074 msg_set_seqno(hdr, seqno);
1075 msg_set_ack(hdr, ack);
1076 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001077 _skb = skb_clone(skb, GFP_ATOMIC);
Richard Alpe4952cd32016-02-11 10:43:15 +01001078 if (!_skb) {
Tuong Lien06e7c702019-11-01 09:58:57 +07001079 kfree_skb(skb);
Jon Maloye654f9f2019-08-15 16:42:50 +02001080 __skb_queue_purge(list);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001081 return -ENOBUFS;
Richard Alpe4952cd32016-02-11 10:43:15 +01001082 }
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001083 __skb_queue_tail(transmq, skb);
Hamish Martina34f8292020-07-09 09:06:44 +12001084 tipc_link_set_skb_retransmit_time(skb, l);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001085 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001086 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001087 l->rcv_unacked = 0;
Jon Paul Maloy95901122016-11-25 10:35:02 -05001088 l->stats.sent_pkts++;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001089 seqno++;
1090 continue;
1091 }
Tuong Lien06e7c702019-11-01 09:58:57 +07001092 if (tipc_msg_try_bundle(l->backlog[imp].target_bskb, &skb,
Tuong Lienfc1b6d62019-11-08 12:05:11 +07001093 mss, l->addr, &new_bundle)) {
Tuong Lien06e7c702019-11-01 09:58:57 +07001094 if (skb) {
1095 /* Keep a ref. to the skb for next try */
1096 l->backlog[imp].target_bskb = skb;
1097 l->backlog[imp].len++;
1098 __skb_queue_tail(backlogq, skb);
1099 } else {
1100 if (new_bundle) {
1101 l->stats.sent_bundles++;
1102 l->stats.sent_bundled++;
1103 }
1104 l->stats.sent_bundled++;
1105 }
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001106 continue;
1107 }
Tuong Liene95584a2019-10-02 18:49:43 +07001108 l->backlog[imp].target_bskb = NULL;
Tuong Lien06e7c702019-11-01 09:58:57 +07001109 l->backlog[imp].len += (1 + skb_queue_len(list));
1110 __skb_queue_tail(backlogq, skb);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001111 skb_queue_splice_tail_init(list, backlogq);
1112 }
1113 l->snd_nxt = seqno;
Jon Paul Maloy365ad352017-01-03 10:55:11 -05001114 return rc;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001115}
1116
Jon Maloy16ad3f42019-12-10 00:52:46 +01001117static void tipc_link_update_cwin(struct tipc_link *l, int released,
1118 bool retransmitted)
1119{
1120 int bklog_len = skb_queue_len(&l->backlogq);
1121 struct sk_buff_head *txq = &l->transmq;
1122 int txq_len = skb_queue_len(txq);
1123 u16 cwin = l->window;
1124
1125 /* Enter fast recovery */
1126 if (unlikely(retransmitted)) {
1127 l->ssthresh = max_t(u16, l->window / 2, 300);
Tuong Lienedadedf2020-04-15 18:34:49 +07001128 l->window = min_t(u16, l->ssthresh, l->window);
Jon Maloy16ad3f42019-12-10 00:52:46 +01001129 return;
1130 }
1131 /* Enter slow start */
1132 if (unlikely(!released)) {
1133 l->ssthresh = max_t(u16, l->window / 2, 300);
1134 l->window = l->min_win;
1135 return;
1136 }
1137 /* Don't increase window if no pressure on the transmit queue */
1138 if (txq_len + bklog_len < cwin)
1139 return;
1140
1141 /* Don't increase window if there are holes the transmit queue */
1142 if (txq_len && l->snd_nxt - buf_seqno(skb_peek(txq)) != txq_len)
1143 return;
1144
1145 l->cong_acks += released;
1146
1147 /* Slow start */
1148 if (cwin <= l->ssthresh) {
1149 l->window = min_t(u16, cwin + released, l->max_win);
1150 return;
1151 }
1152 /* Congestion avoidance */
1153 if (l->cong_acks < cwin)
1154 return;
1155 l->window = min_t(u16, ++cwin, l->max_win);
1156 l->cong_acks = 0;
1157}
1158
YueHaibinge064cce2018-07-19 17:16:59 +08001159static void tipc_link_advance_backlog(struct tipc_link *l,
1160 struct sk_buff_head *xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001161{
Jon Paul Maloy52666982015-10-22 08:51:41 -04001162 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
Jon Maloy16ad3f42019-12-10 00:52:46 +01001163 struct sk_buff_head *txq = &l->transmq;
1164 struct sk_buff *skb, *_skb;
1165 u16 ack = l->rcv_nxt - 1;
1166 u16 seqno = l->snd_nxt;
1167 struct tipc_msg *hdr;
1168 u16 cwin = l->window;
Tuong Liene95584a2019-10-02 18:49:43 +07001169 u32 imp;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001170
Jon Maloy16ad3f42019-12-10 00:52:46 +01001171 while (skb_queue_len(txq) < cwin) {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001172 skb = skb_peek(&l->backlogq);
1173 if (!skb)
1174 break;
1175 _skb = skb_clone(skb, GFP_ATOMIC);
1176 if (!_skb)
1177 break;
1178 __skb_dequeue(&l->backlogq);
1179 hdr = buf_msg(skb);
Tuong Liene95584a2019-10-02 18:49:43 +07001180 imp = msg_importance(hdr);
1181 l->backlog[imp].len--;
1182 if (unlikely(skb == l->backlog[imp].target_bskb))
1183 l->backlog[imp].target_bskb = NULL;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001184 __skb_queue_tail(&l->transmq, skb);
Hamish Martina34f8292020-07-09 09:06:44 +12001185 tipc_link_set_skb_retransmit_time(skb, l);
Hoang Le05572272018-12-19 11:42:19 +07001186
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001187 __skb_queue_tail(xmitq, _skb);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04001188 TIPC_SKB_CB(skb)->ackers = l->ackers;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001189 msg_set_seqno(hdr, seqno);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001190 msg_set_ack(hdr, ack);
1191 msg_set_bcast_ack(hdr, bc_ack);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001192 l->rcv_unacked = 0;
Jon Paul Maloy95901122016-11-25 10:35:02 -05001193 l->stats.sent_pkts++;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001194 seqno++;
1195 }
1196 l->snd_nxt = seqno;
1197}
1198
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001199/**
1200 * link_retransmit_failure() - Detect repeated retransmit failures
1201 * @l: tipc link sender
1202 * @r: tipc link receiver (= l in case of unicast)
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001203 * @rc: returned code
1204 *
1205 * Return: true if the repeated retransmit failures happens, otherwise
1206 * false
1207 */
1208static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r,
Tuong Lien71204232019-08-15 10:24:08 +07001209 int *rc)
Allan Stephensd356eeb2006-06-25 23:40:01 -07001210{
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001211 struct sk_buff *skb = skb_peek(&l->transmq);
1212 struct tipc_msg *hdr;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001213
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001214 if (!skb)
1215 return false;
Tuong Lien71204232019-08-15 10:24:08 +07001216
1217 if (!TIPC_SKB_CB(skb)->retr_cnt)
1218 return false;
1219
1220 if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp +
Hoang Le426071f2019-11-06 13:26:10 +07001221 msecs_to_jiffies(r->tolerance * 10)))
Tuong Lien71204232019-08-15 10:24:08 +07001222 return false;
1223
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001224 hdr = buf_msg(skb);
Tuong Lien71204232019-08-15 10:24:08 +07001225 if (link_is_bc_sndlink(l) && !less(r->acked, msg_seqno(hdr)))
1226 return false;
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001227
Tuong Lien71204232019-08-15 10:24:08 +07001228 pr_warn("Retransmission failure on link <%s>\n", l->name);
1229 link_print(l, "State of link ");
1230 pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
1231 msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr));
1232 pr_info("sqno %u, prev: %x, dest: %x\n",
1233 msg_seqno(hdr), msg_prevnode(hdr), msg_destnode(hdr));
1234 pr_info("retr_stamp %d, retr_cnt %d\n",
1235 jiffies_to_msecs(TIPC_SKB_CB(skb)->retr_stamp),
1236 TIPC_SKB_CB(skb)->retr_cnt);
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001237
Tuong Lien71204232019-08-15 10:24:08 +07001238 trace_tipc_list_dump(&l->transmq, true, "retrans failure!");
1239 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!");
1240 trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!");
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001241
Tuong Lien71204232019-08-15 10:24:08 +07001242 if (link_is_bc_sndlink(l)) {
1243 r->state = LINK_RESET;
Tuong Liend7626b52020-05-26 16:38:34 +07001244 *rc |= TIPC_LINK_DOWN_EVT;
Tuong Lien71204232019-08-15 10:24:08 +07001245 } else {
Tuong Liend7626b52020-05-26 16:38:34 +07001246 *rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001247 }
1248
Tuong Lien71204232019-08-15 10:24:08 +07001249 return true;
Allan Stephensd356eeb2006-06-25 23:40:01 -07001250}
1251
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001252/* tipc_data_input - deliver data and name distr msgs to upper layer
Erik Hugne7ae934b2014-07-01 10:22:40 +02001253 *
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001254 * Consumes buffer if message is of right type
Erik Hugne7ae934b2014-07-01 10:22:40 +02001255 * Node lock must be held
1256 */
Jon Paul Maloy52666982015-10-22 08:51:41 -04001257static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001258 struct sk_buff_head *inputq)
Erik Hugne7ae934b2014-07-01 10:22:40 +02001259{
Jon Maloy399574d2017-10-13 11:04:32 +02001260 struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq;
Jon Paul Maloya853e4c2017-01-18 13:50:52 -05001261 struct tipc_msg *hdr = buf_msg(skb);
1262
1263 switch (msg_user(hdr)) {
Erik Hugne7ae934b2014-07-01 10:22:40 +02001264 case TIPC_LOW_IMPORTANCE:
1265 case TIPC_MEDIUM_IMPORTANCE:
1266 case TIPC_HIGH_IMPORTANCE:
1267 case TIPC_CRITICAL_IMPORTANCE:
Jon Maloy2f487712017-10-13 11:04:31 +02001268 if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) {
Jon Maloy399574d2017-10-13 11:04:32 +02001269 skb_queue_tail(mc_inputq, skb);
Jon Paul Maloya853e4c2017-01-18 13:50:52 -05001270 return true;
1271 }
Miaohe Lin7f8901b2020-08-18 08:07:13 -04001272 fallthrough;
Jon Maloy2f487712017-10-13 11:04:31 +02001273 case CONN_MANAGER:
Jon Maloy36c0a9d2017-10-16 16:04:51 +02001274 skb_queue_tail(inputq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001275 return true;
Jon Maloy399574d2017-10-13 11:04:32 +02001276 case GROUP_PROTOCOL:
1277 skb_queue_tail(mc_inputq, skb);
1278 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001279 case NAME_DISTRIBUTOR:
Jon Paul Maloy52666982015-10-22 08:51:41 -04001280 l->bc_rcvlink->state = LINK_ESTABLISHED;
1281 skb_queue_tail(l->namedq, skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001282 return true;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001283 case MSG_BUNDLER:
Jon Paul Maloydff29b12015-04-02 09:33:01 -04001284 case TUNNEL_PROTOCOL:
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001285 case MSG_FRAGMENTER:
1286 case BCAST_PROTOCOL:
1287 return false;
Tuong Lien1ef6f7c2020-09-18 08:17:28 +07001288#ifdef CONFIG_TIPC_CRYPTO
1289 case MSG_CRYPTO:
1290 tipc_crypto_msg_rcv(l->net, skb);
1291 return true;
1292#endif
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001293 default:
1294 pr_warn("Dropping received illegal msg type\n");
1295 kfree_skb(skb);
Hoang Le7384b532019-02-11 09:18:28 +07001296 return true;
Tom Rixf2219c32020-11-01 07:58:22 -08001297 }
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001298}
1299
1300/* tipc_link_input - process packet that has passed link protocol check
1301 *
1302 * Consumes buffer
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001303 */
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001304static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
Tuong Lien58ee86b2019-04-04 11:09:53 +07001305 struct sk_buff_head *inputq,
1306 struct sk_buff **reasm_skb)
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001307{
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001308 struct tipc_msg *hdr = buf_msg(skb);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001309 struct sk_buff *iskb;
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001310 struct sk_buff_head tmpq;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001311 int usr = msg_user(hdr);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001312 int pos = 0;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001313
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001314 if (usr == MSG_BUNDLER) {
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001315 skb_queue_head_init(&tmpq);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001316 l->stats.recv_bundles++;
1317 l->stats.recv_bundled += msg_msgcnt(hdr);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001318 while (tipc_msg_extract(skb, &iskb, &pos))
Jon Paul Maloy9945e802015-10-15 14:52:40 -04001319 tipc_data_input(l, iskb, &tmpq);
1320 tipc_skb_queue_splice_tail(&tmpq, inputq);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001321 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001322 } else if (usr == MSG_FRAGMENTER) {
1323 l->stats.recv_fragments++;
1324 if (tipc_buf_append(reasm_skb, &skb)) {
1325 l->stats.recv_fragmented++;
Jon Paul Maloy9073fb82015-07-30 18:24:25 -04001326 tipc_data_input(l, skb, inputq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001327 } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) {
1328 pr_warn_ratelimited("Unable to build fragment list\n");
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001329 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001330 }
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001331 return 0;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001332 } else if (usr == BCAST_PROTOCOL) {
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001333 tipc_bcast_lock(l->net);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001334 tipc_link_bc_init_rcv(l->bc_rcvlink, hdr);
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04001335 tipc_bcast_unlock(l->net);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001336 }
Tuong Lien58ee86b2019-04-04 11:09:53 +07001337
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001338 kfree_skb(skb);
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001339 return 0;
Erik Hugne7ae934b2014-07-01 10:22:40 +02001340}
1341
Tuong Lien58ee86b2019-04-04 11:09:53 +07001342/* tipc_link_tnl_rcv() - receive TUNNEL_PROTOCOL message, drop or process the
1343 * inner message along with the ones in the old link's
1344 * deferdq
1345 * @l: tunnel link
1346 * @skb: TUNNEL_PROTOCOL message
1347 * @inputq: queue to put messages ready for delivery
1348 */
1349static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb,
1350 struct sk_buff_head *inputq)
1351{
1352 struct sk_buff **reasm_skb = &l->failover_reasm_skb;
Tuong Lien2320bcd2019-07-24 08:56:12 +07001353 struct sk_buff **reasm_tnlmsg = &l->reasm_tnlmsg;
Tuong Lien58ee86b2019-04-04 11:09:53 +07001354 struct sk_buff_head *fdefq = &l->failover_deferdq;
1355 struct tipc_msg *hdr = buf_msg(skb);
1356 struct sk_buff *iskb;
1357 int ipos = 0;
1358 int rc = 0;
1359 u16 seqno;
1360
Tuong Lien2320bcd2019-07-24 08:56:12 +07001361 if (msg_type(hdr) == SYNCH_MSG) {
1362 kfree_skb(skb);
1363 return 0;
1364 }
Tuong Lien58ee86b2019-04-04 11:09:53 +07001365
Tuong Lien2320bcd2019-07-24 08:56:12 +07001366 /* Not a fragment? */
1367 if (likely(!msg_nof_fragms(hdr))) {
1368 if (unlikely(!tipc_msg_extract(skb, &iskb, &ipos))) {
1369 pr_warn_ratelimited("Unable to extract msg, defq: %d\n",
1370 skb_queue_len(fdefq));
1371 return 0;
1372 }
1373 kfree_skb(skb);
1374 } else {
1375 /* Set fragment type for buf_append */
1376 if (msg_fragm_no(hdr) == 1)
1377 msg_set_type(hdr, FIRST_FRAGMENT);
1378 else if (msg_fragm_no(hdr) < msg_nof_fragms(hdr))
1379 msg_set_type(hdr, FRAGMENT);
1380 else
1381 msg_set_type(hdr, LAST_FRAGMENT);
1382
1383 if (!tipc_buf_append(reasm_tnlmsg, &skb)) {
1384 /* Successful but non-complete reassembly? */
1385 if (*reasm_tnlmsg || link_is_bc_rcvlink(l))
1386 return 0;
1387 pr_warn_ratelimited("Unable to reassemble tunnel msg\n");
1388 return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
1389 }
1390 iskb = skb;
Tuong Lien58ee86b2019-04-04 11:09:53 +07001391 }
1392
1393 do {
1394 seqno = buf_seqno(iskb);
Tuong Lien58ee86b2019-04-04 11:09:53 +07001395 if (unlikely(less(seqno, l->drop_point))) {
1396 kfree_skb(iskb);
1397 continue;
1398 }
Tuong Lien58ee86b2019-04-04 11:09:53 +07001399 if (unlikely(seqno != l->drop_point)) {
1400 __tipc_skb_queue_sorted(fdefq, seqno, iskb);
1401 continue;
1402 }
1403
1404 l->drop_point++;
Tuong Lien58ee86b2019-04-04 11:09:53 +07001405 if (!tipc_data_input(l, iskb, inputq))
1406 rc |= tipc_link_input(l, iskb, inputq, reasm_skb);
1407 if (unlikely(rc))
1408 break;
1409 } while ((iskb = __tipc_skb_dequeue(fdefq, l->drop_point)));
1410
Tuong Lien58ee86b2019-04-04 11:09:53 +07001411 return rc;
1412}
1413
Tuong Liend7626b52020-05-26 16:38:34 +07001414/**
1415 * tipc_get_gap_ack_blks - get Gap ACK blocks from PROTOCOL/STATE_MSG
1416 * @ga: returned pointer to the Gap ACK blocks if any
1417 * @l: the tipc link
1418 * @hdr: the PROTOCOL/STATE_MSG header
1419 * @uc: desired Gap ACK blocks type, i.e. unicast (= 1) or broadcast (= 0)
1420 *
1421 * Return: the total Gap ACK blocks size
1422 */
1423u16 tipc_get_gap_ack_blks(struct tipc_gap_ack_blks **ga, struct tipc_link *l,
1424 struct tipc_msg *hdr, bool uc)
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001425{
Tuong Liend7626b52020-05-26 16:38:34 +07001426 struct tipc_gap_ack_blks *p;
1427 u16 sz = 0;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001428
Tuong Liend7626b52020-05-26 16:38:34 +07001429 /* Does peer support the Gap ACK blocks feature? */
1430 if (l->peer_caps & TIPC_GAP_ACK_BLOCK) {
1431 p = (struct tipc_gap_ack_blks *)msg_data(hdr);
1432 sz = ntohs(p->len);
1433 /* Sanity check */
Gustavo A. R. Silvae034c6d2020-06-18 08:35:00 -05001434 if (sz == struct_size(p, gacks, p->ugack_cnt + p->bgack_cnt)) {
Tuong Liend7626b52020-05-26 16:38:34 +07001435 /* Good, check if the desired type exists */
1436 if ((uc && p->ugack_cnt) || (!uc && p->bgack_cnt))
1437 goto ok;
1438 /* Backward compatible: peer might not support bc, but uc? */
Gustavo A. R. Silvae034c6d2020-06-18 08:35:00 -05001439 } else if (uc && sz == struct_size(p, gacks, p->ugack_cnt)) {
Tuong Liend7626b52020-05-26 16:38:34 +07001440 if (p->ugack_cnt) {
1441 p->bgack_cnt = 0;
1442 goto ok;
1443 }
1444 }
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001445 }
Tuong Liend7626b52020-05-26 16:38:34 +07001446 /* Other cases: ignore! */
1447 p = NULL;
1448
1449ok:
1450 *ga = p;
1451 return sz;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001452}
1453
Tuong Liend7626b52020-05-26 16:38:34 +07001454static u8 __tipc_build_gap_ack_blks(struct tipc_gap_ack_blks *ga,
1455 struct tipc_link *l, u8 start_index)
Tuong Lien91959482019-04-04 11:09:51 +07001456{
Tuong Liend7626b52020-05-26 16:38:34 +07001457 struct tipc_gap_ack *gacks = &ga->gacks[start_index];
Tuong Lien91959482019-04-04 11:09:51 +07001458 struct sk_buff *skb = skb_peek(&l->deferdq);
Tuong Liend7626b52020-05-26 16:38:34 +07001459 u16 expect, seqno = 0;
Tuong Lien91959482019-04-04 11:09:51 +07001460 u8 n = 0;
1461
Tuong Liend7626b52020-05-26 16:38:34 +07001462 if (!skb)
1463 return 0;
Tuong Lien91959482019-04-04 11:09:51 +07001464
1465 expect = buf_seqno(skb);
1466 skb_queue_walk(&l->deferdq, skb) {
1467 seqno = buf_seqno(skb);
1468 if (unlikely(more(seqno, expect))) {
Tuong Liend7626b52020-05-26 16:38:34 +07001469 gacks[n].ack = htons(expect - 1);
1470 gacks[n].gap = htons(seqno - expect);
1471 if (++n >= MAX_GAP_ACK_BLKS / 2) {
Tuong Liend7626b52020-05-26 16:38:34 +07001472 pr_info_ratelimited("Gacks on %s: %d, ql: %d!\n",
Tuong Lien03b6fef2020-05-26 16:38:37 +07001473 l->name, n,
Tuong Liend7626b52020-05-26 16:38:34 +07001474 skb_queue_len(&l->deferdq));
1475 return n;
Tuong Lien91959482019-04-04 11:09:51 +07001476 }
1477 } else if (unlikely(less(seqno, expect))) {
1478 pr_warn("Unexpected skb in deferdq!\n");
1479 continue;
1480 }
1481 expect = seqno + 1;
1482 }
1483
1484 /* last block */
Tuong Liend7626b52020-05-26 16:38:34 +07001485 gacks[n].ack = htons(seqno);
1486 gacks[n].gap = 0;
Tuong Lien91959482019-04-04 11:09:51 +07001487 n++;
Tuong Liend7626b52020-05-26 16:38:34 +07001488 return n;
1489}
Tuong Lien91959482019-04-04 11:09:51 +07001490
Tuong Liend7626b52020-05-26 16:38:34 +07001491/* tipc_build_gap_ack_blks - build Gap ACK blocks
1492 * @l: tipc unicast link
1493 * @hdr: the tipc message buffer to store the Gap ACK blocks after built
1494 *
1495 * The function builds Gap ACK blocks for both the unicast & broadcast receiver
1496 * links of a certain peer, the buffer after built has the network data format
1497 * as found at the struct tipc_gap_ack_blks definition.
1498 *
1499 * returns the actual allocated memory size
1500 */
1501static u16 tipc_build_gap_ack_blks(struct tipc_link *l, struct tipc_msg *hdr)
1502{
1503 struct tipc_link *bcl = l->bc_rcvlink;
1504 struct tipc_gap_ack_blks *ga;
1505 u16 len;
1506
1507 ga = (struct tipc_gap_ack_blks *)msg_data(hdr);
1508
1509 /* Start with broadcast link first */
1510 tipc_bcast_lock(bcl->net);
1511 msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1);
1512 msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl));
1513 ga->bgack_cnt = __tipc_build_gap_ack_blks(ga, bcl, 0);
1514 tipc_bcast_unlock(bcl->net);
1515
1516 /* Now for unicast link, but an explicit NACK only (???) */
1517 ga->ugack_cnt = (msg_seq_gap(hdr)) ?
1518 __tipc_build_gap_ack_blks(ga, l, ga->bgack_cnt) : 0;
1519
1520 /* Total len */
Gustavo A. R. Silvae034c6d2020-06-18 08:35:00 -05001521 len = struct_size(ga, gacks, ga->bgack_cnt + ga->ugack_cnt);
Tuong Lien91959482019-04-04 11:09:51 +07001522 ga->len = htons(len);
Tuong Lien91959482019-04-04 11:09:51 +07001523 return len;
1524}
1525
1526/* tipc_link_advance_transmq - advance TIPC link transmq queue by releasing
1527 * acked packets, also doing retransmissions if
1528 * gaps found
1529 * @l: tipc link with transmq queue to be advanced
Tuong Liend7626b52020-05-26 16:38:34 +07001530 * @r: tipc link "receiver" i.e. in case of broadcast (= "l" if unicast)
Tuong Lien91959482019-04-04 11:09:51 +07001531 * @acked: seqno of last packet acked by peer without any gaps before
1532 * @gap: # of gap packets
1533 * @ga: buffer pointer to Gap ACK blocks from peer
1534 * @xmitq: queue for accumulating the retransmitted packets if any
Tuong Liend7626b52020-05-26 16:38:34 +07001535 * @retransmitted: returned boolean value if a retransmission is really issued
1536 * @rc: returned code e.g. TIPC_LINK_DOWN_EVT if a repeated retransmit failures
1537 * happens (- unlikely case)
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001538 *
Tuong Liend7626b52020-05-26 16:38:34 +07001539 * Return: the number of packets released from the link transmq
Tuong Lien91959482019-04-04 11:09:51 +07001540 */
Tuong Liend7626b52020-05-26 16:38:34 +07001541static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r,
1542 u16 acked, u16 gap,
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001543 struct tipc_gap_ack_blks *ga,
Tuong Liend7626b52020-05-26 16:38:34 +07001544 struct sk_buff_head *xmitq,
1545 bool *retransmitted, int *rc)
Tuong Lien91959482019-04-04 11:09:51 +07001546{
Tuong Liend7626b52020-05-26 16:38:34 +07001547 struct tipc_gap_ack_blks *last_ga = r->last_ga, *this_ga = NULL;
1548 struct tipc_gap_ack *gacks = NULL;
Tuong Lien91959482019-04-04 11:09:51 +07001549 struct sk_buff *skb, *_skb, *tmp;
1550 struct tipc_msg *hdr;
Tuong Liend7626b52020-05-26 16:38:34 +07001551 u32 qlen = skb_queue_len(&l->transmq);
1552 u16 nacked = acked, ngap = gap, gack_cnt = 0;
Tuong Lien91959482019-04-04 11:09:51 +07001553 u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1;
1554 u16 ack = l->rcv_nxt - 1;
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001555 u16 seqno, n = 0;
Tuong Liend7626b52020-05-26 16:38:34 +07001556 u16 end = r->acked, start = end, offset = r->last_gap;
1557 u16 si = (last_ga) ? last_ga->start_index : 0;
1558 bool is_uc = !link_is_bc_sndlink(l);
1559 bool bc_has_acked = false;
Tuong Lien6a6b5c82019-06-17 12:15:42 +07001560
Tuong Lienc6ed7a52020-05-26 16:38:35 +07001561 trace_tipc_link_retrans(r, acked + 1, acked + gap, &l->transmq);
1562
Tuong Liend7626b52020-05-26 16:38:34 +07001563 /* Determine Gap ACK blocks if any for the particular link */
1564 if (ga && is_uc) {
1565 /* Get the Gap ACKs, uc part */
1566 gack_cnt = ga->ugack_cnt;
1567 gacks = &ga->gacks[ga->bgack_cnt];
1568 } else if (ga) {
1569 /* Copy the Gap ACKs, bc part, for later renewal if needed */
Gustavo A. R. Silvae034c6d2020-06-18 08:35:00 -05001570 this_ga = kmemdup(ga, struct_size(ga, gacks, ga->bgack_cnt),
Tuong Liend7626b52020-05-26 16:38:34 +07001571 GFP_ATOMIC);
1572 if (likely(this_ga)) {
1573 this_ga->start_index = 0;
1574 /* Start with the bc Gap ACKs */
1575 gack_cnt = this_ga->bgack_cnt;
1576 gacks = &this_ga->gacks[0];
1577 } else {
1578 /* Hmm, we can get in trouble..., simply ignore it */
1579 pr_warn_ratelimited("Ignoring bc Gap ACKs, no memory\n");
1580 }
1581 }
1582
1583 /* Advance the link transmq */
Tuong Lien91959482019-04-04 11:09:51 +07001584 skb_queue_walk_safe(&l->transmq, skb, tmp) {
1585 seqno = buf_seqno(skb);
1586
1587next_gap_ack:
Tuong Liend7626b52020-05-26 16:38:34 +07001588 if (less_eq(seqno, nacked)) {
1589 if (is_uc)
1590 goto release;
1591 /* Skip packets peer has already acked */
1592 if (!more(seqno, r->acked))
1593 continue;
1594 /* Get the next of last Gap ACK blocks */
1595 while (more(seqno, end)) {
1596 if (!last_ga || si >= last_ga->bgack_cnt)
1597 break;
1598 start = end + offset + 1;
1599 end = ntohs(last_ga->gacks[si].ack);
1600 offset = ntohs(last_ga->gacks[si].gap);
1601 si++;
1602 WARN_ONCE(more(start, end) ||
1603 (!offset &&
1604 si < last_ga->bgack_cnt) ||
1605 si > MAX_GAP_ACK_BLKS,
1606 "Corrupted Gap ACK: %d %d %d %d %d\n",
1607 start, end, offset, si,
1608 last_ga->bgack_cnt);
1609 }
1610 /* Check against the last Gap ACK block */
1611 if (in_range(seqno, start, end))
1612 continue;
1613 /* Update/release the packet peer is acking */
1614 bc_has_acked = true;
1615 if (--TIPC_SKB_CB(skb)->ackers)
1616 continue;
1617release:
Tuong Lien91959482019-04-04 11:09:51 +07001618 /* release skb */
1619 __skb_unlink(skb, &l->transmq);
1620 kfree_skb(skb);
Tuong Liend7626b52020-05-26 16:38:34 +07001621 } else if (less_eq(seqno, nacked + ngap)) {
1622 /* First gap: check if repeated retrans failures? */
1623 if (unlikely(seqno == acked + 1 &&
1624 link_retransmit_failure(l, r, rc))) {
1625 /* Ignore this bc Gap ACKs if any */
1626 kfree(this_ga);
1627 this_ga = NULL;
1628 break;
1629 }
Tuong Lien71204232019-08-15 10:24:08 +07001630 /* retransmit skb if unrestricted*/
Tuong Lien382f5982019-04-04 11:09:52 +07001631 if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
1632 continue;
Hamish Martina34f8292020-07-09 09:06:44 +12001633 tipc_link_set_skb_retransmit_time(skb, l);
Tuong Lienfc1b6d62019-11-08 12:05:11 +07001634 _skb = pskb_copy(skb, GFP_ATOMIC);
Tuong Lien91959482019-04-04 11:09:51 +07001635 if (!_skb)
1636 continue;
1637 hdr = buf_msg(_skb);
1638 msg_set_ack(hdr, ack);
1639 msg_set_bcast_ack(hdr, bc_ack);
1640 _skb->priority = TC_PRIO_CONTROL;
1641 __skb_queue_tail(xmitq, _skb);
1642 l->stats.retransmitted++;
Tuong Lien03b6fef2020-05-26 16:38:37 +07001643 if (!is_uc)
1644 r->stats.retransmitted++;
Tuong Liend7626b52020-05-26 16:38:34 +07001645 *retransmitted = true;
Tuong Lien71204232019-08-15 10:24:08 +07001646 /* Increase actual retrans counter & mark first time */
1647 if (!TIPC_SKB_CB(skb)->retr_cnt++)
1648 TIPC_SKB_CB(skb)->retr_stamp = jiffies;
Tuong Lien91959482019-04-04 11:09:51 +07001649 } else {
1650 /* retry with Gap ACK blocks if any */
Tuong Liend7626b52020-05-26 16:38:34 +07001651 if (n >= gack_cnt)
Tuong Lien91959482019-04-04 11:09:51 +07001652 break;
Tuong Liend7626b52020-05-26 16:38:34 +07001653 nacked = ntohs(gacks[n].ack);
1654 ngap = ntohs(gacks[n].gap);
Tuong Lien91959482019-04-04 11:09:51 +07001655 n++;
1656 goto next_gap_ack;
1657 }
1658 }
Tuong Liend7626b52020-05-26 16:38:34 +07001659
1660 /* Renew last Gap ACK blocks for bc if needed */
1661 if (bc_has_acked) {
1662 if (this_ga) {
1663 kfree(last_ga);
1664 r->last_ga = this_ga;
1665 r->last_gap = gap;
1666 } else if (last_ga) {
1667 if (less(acked, start)) {
1668 si--;
1669 offset = start - acked - 1;
1670 } else if (less(acked, end)) {
1671 acked = end;
1672 }
1673 if (si < last_ga->bgack_cnt) {
1674 last_ga->start_index = si;
1675 r->last_gap = offset;
1676 } else {
1677 kfree(last_ga);
1678 r->last_ga = NULL;
1679 r->last_gap = 0;
1680 }
1681 } else {
1682 r->last_gap = 0;
1683 }
1684 r->acked = acked;
1685 } else {
1686 kfree(this_ga);
1687 }
1688
1689 return qlen - skb_queue_len(&l->transmq);
Tuong Lien91959482019-04-04 11:09:51 +07001690}
1691
Jon Paul Maloy34b9cd62016-04-15 13:33:07 -04001692/* tipc_link_build_state_msg: prepare link state message for transmission
Jon Paul Maloy52666982015-10-22 08:51:41 -04001693 *
1694 * Note that sending of broadcast ack is coordinated among nodes, to reduce
1695 * risk of ack storms towards the sender
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001696 */
Jon Paul Maloy34b9cd62016-04-15 13:33:07 -04001697int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001698{
Jon Paul Maloy52666982015-10-22 08:51:41 -04001699 if (!l)
1700 return 0;
1701
1702 /* Broadcast ACK must be sent via a unicast link => defer to caller */
1703 if (link_is_bc_rcvlink(l)) {
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001704 if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf)
Jon Paul Maloy52666982015-10-22 08:51:41 -04001705 return 0;
1706 l->rcv_unacked = 0;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001707
1708 /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */
1709 l->snd_nxt = l->rcv_nxt;
1710 return TIPC_LINK_SND_STATE;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001711 }
Jon Paul Maloy52666982015-10-22 08:51:41 -04001712 /* Unicast ACK */
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001713 l->rcv_unacked = 0;
1714 l->stats.sent_acks++;
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001715 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001716 return 0;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001717}
1718
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001719/* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message
1720 */
1721void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
1722{
1723 int mtyp = RESET_MSG;
Jon Paul Maloy634696b2016-04-15 13:33:03 -04001724 struct sk_buff *skb;
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001725
1726 if (l->state == LINK_ESTABLISHING)
1727 mtyp = ACTIVATE_MSG;
1728
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001729 tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq);
Jon Paul Maloy634696b2016-04-15 13:33:03 -04001730
1731 /* Inform peer that this endpoint is going down if applicable */
1732 skb = skb_peek_tail(xmitq);
1733 if (skb && (l->state == LINK_RESET))
1734 msg_set_peer_stopping(buf_msg(skb), 1);
Jon Paul Maloy282b3a02015-10-15 14:52:45 -04001735}
1736
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001737/* tipc_link_build_nack_msg: prepare link nack message for transmission
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001738 * Note that sending of broadcast NACK is coordinated among nodes, to
1739 * reduce the risk of NACK storms towards the sender
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001740 */
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001741static int tipc_link_build_nack_msg(struct tipc_link *l,
1742 struct sk_buff_head *xmitq)
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001743{
1744 u32 def_cnt = ++l->stats.deferred_recv;
Jon Maloy02288242019-12-10 00:52:44 +01001745 struct sk_buff_head *dfq = &l->deferdq;
1746 u32 defq_len = skb_queue_len(dfq);
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001747 int match1, match2;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001748
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001749 if (link_is_bc_rcvlink(l)) {
1750 match1 = def_cnt & 0xf;
1751 match2 = tipc_own_addr(l->net) & 0xf;
1752 if (match1 == match2)
1753 return TIPC_LINK_SND_STATE;
1754 return 0;
1755 }
Jon Paul Maloy52666982015-10-22 08:51:41 -04001756
Jon Maloy02288242019-12-10 00:52:44 +01001757 if (defq_len >= 3 && !((defq_len - 3) % 16)) {
1758 u16 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt;
1759
1760 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0,
1761 rcvgap, 0, 0, xmitq);
1762 }
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001763 return 0;
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001764}
1765
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001766/* tipc_link_rcv - process TIPC packets/messages arriving from off-node
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001767 * @l: the link that should handle the message
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001768 * @skb: TIPC packet
1769 * @xmitq: queue to place packets to be sent after this call
1770 */
1771int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
1772 struct sk_buff_head *xmitq)
1773{
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001774 struct sk_buff_head *defq = &l->deferdq;
Tuong Lien382f5982019-04-04 11:09:52 +07001775 struct tipc_msg *hdr = buf_msg(skb);
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001776 u16 seqno, rcv_nxt, win_lim;
Jon Maloy16ad3f42019-12-10 00:52:46 +01001777 int released = 0;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001778 int rc = 0;
1779
Tuong Lien382f5982019-04-04 11:09:52 +07001780 /* Verify and update link state */
1781 if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
1782 return tipc_link_proto_rcv(l, skb, xmitq);
1783
1784 /* Don't send probe at next timeout expiration */
1785 l->silent_intv_cnt = 0;
1786
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001787 do {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001788 hdr = buf_msg(skb);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001789 seqno = msg_seqno(hdr);
1790 rcv_nxt = l->rcv_nxt;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001791 win_lim = rcv_nxt + TIPC_MAX_LINK_WIN;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001792
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001793 if (unlikely(!link_is_up(l))) {
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04001794 if (l->state == LINK_ESTABLISHING)
1795 rc = TIPC_LINK_UP_EVT;
Jon Maloy16ad3f42019-12-10 00:52:46 +01001796 kfree_skb(skb);
1797 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001798 }
1799
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001800 /* Drop if outside receive window */
1801 if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
1802 l->stats.duplicates++;
Jon Maloy16ad3f42019-12-10 00:52:46 +01001803 kfree_skb(skb);
1804 break;
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001805 }
Tuong Liend7626b52020-05-26 16:38:34 +07001806 released += tipc_link_advance_transmq(l, l, msg_ack(hdr), 0,
1807 NULL, NULL, NULL, NULL);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001808
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001809 /* Defer delivery if sequence gap */
1810 if (unlikely(seqno != rcv_nxt)) {
Tuong Lien03b6fef2020-05-26 16:38:37 +07001811 if (!__tipc_skb_queue_sorted(defq, seqno, skb))
1812 l->stats.duplicates++;
Jon Paul Maloye0a05eb2016-09-01 13:52:51 -04001813 rc |= tipc_link_build_nack_msg(l, xmitq);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001814 break;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001815 }
1816
Jon Paul Maloy81204c42015-10-15 14:52:42 -04001817 /* Deliver packet */
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001818 l->rcv_nxt++;
Jon Paul Maloy95901122016-11-25 10:35:02 -05001819 l->stats.recv_pkts++;
Tuong Lien58ee86b2019-04-04 11:09:53 +07001820
1821 if (unlikely(msg_user(hdr) == TUNNEL_PROTOCOL))
1822 rc |= tipc_link_tnl_rcv(l, skb, l->inputq);
1823 else if (!tipc_data_input(l, skb, l->inputq))
1824 rc |= tipc_link_input(l, skb, l->inputq, &l->reasm_buf);
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001825 if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
Jon Paul Maloy34b9cd62016-04-15 13:33:07 -04001826 rc |= tipc_link_build_state_msg(l, xmitq);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001827 if (unlikely(rc & ~TIPC_LINK_SND_STATE))
Jon Paul Maloy52666982015-10-22 08:51:41 -04001828 break;
Tuong Lien382f5982019-04-04 11:09:52 +07001829 } while ((skb = __tipc_skb_dequeue(defq, l->rcv_nxt)));
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001830
Jon Maloy16ad3f42019-12-10 00:52:46 +01001831 /* Forward queues and wake up waiting users */
1832 if (released) {
1833 tipc_link_update_cwin(l, released, 0);
1834 tipc_link_advance_backlog(l, xmitq);
1835 if (unlikely(!skb_queue_empty(&l->wakeupq)))
1836 link_prepare_wakeup(l);
1837 }
Jon Paul Maloyd9992972015-07-16 16:54:31 -04001838 return rc;
1839}
1840
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001841static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001842 bool probe_reply, u16 rcvgap,
1843 int tolerance, int priority,
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001844 struct sk_buff_head *xmitq)
1845{
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001846 struct tipc_mon_state *mstate = &l->mon_state;
Tuong Lien03b6fef2020-05-26 16:38:37 +07001847 struct sk_buff_head *dfq = &l->deferdq;
1848 struct tipc_link *bcl = l->bc_rcvlink;
1849 struct tipc_msg *hdr;
1850 struct sk_buff *skb;
1851 bool node_up = link_is_up(bcl);
1852 u16 glen = 0, bc_rcvgap = 0;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001853 int dlen = 0;
1854 void *data;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001855
1856 /* Don't send protocol message during reset or link failover */
Jon Paul Maloy662921c2015-07-30 18:24:21 -04001857 if (tipc_link_is_blocked(l))
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001858 return;
1859
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001860 if (!tipc_link_is_up(l) && (mtyp == STATE_MSG))
1861 return;
1862
Jon Maloy02288242019-12-10 00:52:44 +01001863 if ((probe || probe_reply) && !skb_queue_empty(dfq))
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001864 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt;
1865
1866 skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE,
Tuong Lien91959482019-04-04 11:09:51 +07001867 tipc_max_domain_size + MAX_GAP_ACK_BLKS_SZ,
1868 l->addr, tipc_own_addr(l->net), 0, 0, 0);
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001869 if (!skb)
1870 return;
1871
1872 hdr = buf_msg(skb);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001873 data = msg_data(hdr);
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001874 msg_set_session(hdr, l->session);
1875 msg_set_bearer_id(hdr, l->bearer_id);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001876 msg_set_net_plane(hdr, l->net_plane);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001877 msg_set_next_sent(hdr, l->snd_nxt);
1878 msg_set_ack(hdr, l->rcv_nxt - 1);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04001879 msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1);
Jon Paul Maloy06bd2b12016-10-27 18:51:55 -04001880 msg_set_bc_ack_invalid(hdr, !node_up);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001881 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001882 msg_set_link_tolerance(hdr, tolerance);
1883 msg_set_linkprio(hdr, priority);
1884 msg_set_redundant_link(hdr, node_up);
1885 msg_set_seq_gap(hdr, 0);
Jon Paul Maloy52666982015-10-22 08:51:41 -04001886 msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001887
1888 if (mtyp == STATE_MSG) {
Jon Maloy9012de52018-07-10 01:07:35 +02001889 if (l->peer_caps & TIPC_LINK_PROTO_SEQNO)
1890 msg_set_seqno(hdr, l->snd_nxt_state++);
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001891 msg_set_seq_gap(hdr, rcvgap);
Tuong Lien03b6fef2020-05-26 16:38:37 +07001892 bc_rcvgap = link_bc_rcv_gap(bcl);
1893 msg_set_bc_gap(hdr, bc_rcvgap);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001894 msg_set_probe(hdr, probe);
Jon Maloy8d6e79d2017-11-08 09:59:26 +01001895 msg_set_is_keepalive(hdr, probe || probe_reply);
Tuong Lien91959482019-04-04 11:09:51 +07001896 if (l->peer_caps & TIPC_GAP_ACK_BLOCK)
Tuong Liend7626b52020-05-26 16:38:34 +07001897 glen = tipc_build_gap_ack_blks(l, hdr);
Tuong Lien91959482019-04-04 11:09:51 +07001898 tipc_mon_prep(l->net, data + glen, &dlen, mstate, l->bearer_id);
1899 msg_set_size(hdr, INT_H_SIZE + glen + dlen);
1900 skb_trim(skb, INT_H_SIZE + glen + dlen);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001901 l->stats.sent_states++;
Jon Paul Maloy52666982015-10-22 08:51:41 -04001902 l->rcv_unacked = 0;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001903 } else {
1904 /* RESET_MSG or ACTIVATE_MSG */
Tuong Lien91986ee2019-02-11 13:29:43 +07001905 if (mtyp == ACTIVATE_MSG) {
1906 msg_set_dest_session_valid(hdr, 1);
1907 msg_set_dest_session(hdr, l->peer_session);
1908 }
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001909 msg_set_max_pkt(hdr, l->advertised_mtu);
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04001910 strcpy(data, l->if_name);
1911 msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME);
1912 skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001913 }
Jon Paul Maloye74a3862016-03-03 14:23:21 -05001914 if (probe)
1915 l->stats.sent_probes++;
1916 if (rcvgap)
1917 l->stats.sent_nacks++;
Tuong Lien03b6fef2020-05-26 16:38:37 +07001918 if (bc_rcvgap)
1919 bcl->stats.sent_nacks++;
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001920 skb->priority = TC_PRIO_CONTROL;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001921 __skb_queue_tail(xmitq, skb);
Tuong Lien26574db2018-12-19 09:17:57 +07001922 trace_tipc_proto_build(skb, false, l->name);
Jon Paul Maloy426cc2b2015-07-16 16:54:26 -04001923}
Per Lidenb97bf3f2006-01-02 19:04:38 +01001924
LUU Duc Canhc140eb12018-09-26 21:00:54 +02001925void tipc_link_create_dummy_tnl_msg(struct tipc_link *l,
1926 struct sk_buff_head *xmitq)
1927{
1928 u32 onode = tipc_own_addr(l->net);
1929 struct tipc_msg *hdr, *ihdr;
1930 struct sk_buff_head tnlq;
1931 struct sk_buff *skb;
1932 u32 dnode = l->addr;
1933
Jon Maloye654f9f2019-08-15 16:42:50 +02001934 __skb_queue_head_init(&tnlq);
LUU Duc Canhc140eb12018-09-26 21:00:54 +02001935 skb = tipc_msg_create(TUNNEL_PROTOCOL, FAILOVER_MSG,
1936 INT_H_SIZE, BASIC_H_SIZE,
1937 dnode, onode, 0, 0, 0);
1938 if (!skb) {
1939 pr_warn("%sunable to create tunnel packet\n", link_co_err);
1940 return;
1941 }
1942
1943 hdr = buf_msg(skb);
1944 msg_set_msgcnt(hdr, 1);
1945 msg_set_bearer_id(hdr, l->peer_bearer_id);
1946
1947 ihdr = (struct tipc_msg *)msg_data(hdr);
1948 tipc_msg_init(onode, ihdr, TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
1949 BASIC_H_SIZE, dnode);
1950 msg_set_errcode(ihdr, TIPC_ERR_NO_PORT);
1951 __skb_queue_tail(&tnlq, skb);
1952 tipc_link_xmit(l, &tnlq, xmitq);
1953}
1954
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001955/* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets
Jon Paul Maloyf9aa3582015-10-15 14:52:41 -04001956 * with contents of the link's transmit and backlog queues.
Per Lidenb97bf3f2006-01-02 19:04:38 +01001957 */
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001958void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
1959 int mtyp, struct sk_buff_head *xmitq)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001960{
Tuong Lien58ee86b2019-04-04 11:09:53 +07001961 struct sk_buff_head *fdefq = &tnl->failover_deferdq;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001962 struct sk_buff *skb, *tnlskb;
1963 struct tipc_msg *hdr, tnlhdr;
1964 struct sk_buff_head *queue = &l->transmq;
Tuong Lien2320bcd2019-07-24 08:56:12 +07001965 struct sk_buff_head tmpxq, tnlq, frags;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001966 u16 pktlen, pktcnt, seqno = l->snd_nxt;
Tuong Lien2320bcd2019-07-24 08:56:12 +07001967 bool pktcnt_need_update = false;
Tuong Lien4929a932019-07-24 08:56:11 +07001968 u16 syncpt;
Tuong Lien2320bcd2019-07-24 08:56:12 +07001969 int rc;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001970
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001971 if (!tnl)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001972 return;
Jon Paul Maloy6e498152015-07-30 18:24:19 -04001973
Jon Maloye654f9f2019-08-15 16:42:50 +02001974 __skb_queue_head_init(&tnlq);
Tuong Lien4929a932019-07-24 08:56:11 +07001975 /* Link Synching:
1976 * From now on, send only one single ("dummy") SYNCH message
1977 * to peer. The SYNCH message does not contain any data, just
1978 * a header conveying the synch point to the peer.
1979 */
1980 if (mtyp == SYNCH_MSG && (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) {
1981 tnlskb = tipc_msg_create(TUNNEL_PROTOCOL, SYNCH_MSG,
1982 INT_H_SIZE, 0, l->addr,
1983 tipc_own_addr(l->net),
1984 0, 0, 0);
1985 if (!tnlskb) {
1986 pr_warn("%sunable to create dummy SYNCH_MSG\n",
1987 link_co_err);
1988 return;
1989 }
1990
1991 hdr = buf_msg(tnlskb);
1992 syncpt = l->snd_nxt + skb_queue_len(&l->backlogq) - 1;
1993 msg_set_syncpt(hdr, syncpt);
1994 msg_set_bearer_id(hdr, l->peer_bearer_id);
1995 __skb_queue_tail(&tnlq, tnlskb);
1996 tipc_link_xmit(tnl, &tnlq, xmitq);
1997 return;
1998 }
1999
Tuong Liend0d605c2019-11-06 18:12:17 +07002000 __skb_queue_head_init(&tmpxq);
2001 __skb_queue_head_init(&frags);
2002 /* At least one packet required for safe algorithm => add dummy */
2003 skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
2004 BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net),
2005 0, 0, TIPC_ERR_NO_PORT);
2006 if (!skb) {
2007 pr_warn("%sunable to create tunnel packet\n", link_co_err);
2008 return;
2009 }
2010 __skb_queue_tail(&tnlq, skb);
2011 tipc_link_xmit(l, &tnlq, &tmpxq);
2012 __skb_queue_purge(&tmpxq);
2013
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002014 /* Initialize reusable tunnel packet header */
Jon Paul Maloye74a3862016-03-03 14:23:21 -05002015 tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL,
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002016 mtyp, INT_H_SIZE, l->addr);
Tuong Lien58ee86b2019-04-04 11:09:53 +07002017 if (mtyp == SYNCH_MSG)
2018 pktcnt = l->snd_nxt - buf_seqno(skb_peek(&l->transmq));
2019 else
2020 pktcnt = skb_queue_len(&l->transmq);
2021 pktcnt += skb_queue_len(&l->backlogq);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002022 msg_set_msgcnt(&tnlhdr, pktcnt);
2023 msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
2024tnl:
2025 /* Wrap each packet into a tunnel packet */
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04002026 skb_queue_walk(queue, skb) {
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002027 hdr = buf_msg(skb);
2028 if (queue == &l->backlogq)
2029 msg_set_seqno(hdr, seqno++);
2030 pktlen = msg_size(hdr);
Tuong Lien2320bcd2019-07-24 08:56:12 +07002031
2032 /* Tunnel link MTU is not large enough? This could be
2033 * due to:
2034 * 1) Link MTU has just changed or set differently;
2035 * 2) Or FAILOVER on the top of a SYNCH message
2036 *
2037 * The 2nd case should not happen if peer supports
2038 * TIPC_TUNNEL_ENHANCED
2039 */
2040 if (pktlen > tnl->mtu - INT_H_SIZE) {
2041 if (mtyp == FAILOVER_MSG &&
2042 (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) {
2043 rc = tipc_msg_fragment(skb, &tnlhdr, tnl->mtu,
2044 &frags);
2045 if (rc) {
2046 pr_warn("%sunable to frag msg: rc %d\n",
2047 link_co_err, rc);
2048 return;
2049 }
2050 pktcnt += skb_queue_len(&frags) - 1;
2051 pktcnt_need_update = true;
2052 skb_queue_splice_tail_init(&frags, &tnlq);
2053 continue;
2054 }
2055 /* Unluckily, peer doesn't have TIPC_TUNNEL_ENHANCED
2056 * => Just warn it and return!
2057 */
2058 pr_warn_ratelimited("%stoo large msg <%d, %d>: %d!\n",
2059 link_co_err, msg_user(hdr),
2060 msg_type(hdr), msg_size(hdr));
2061 return;
2062 }
2063
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002064 msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
Parthasarathy Bhuvaragan57d5f642017-01-13 15:46:25 +01002065 tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC);
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002066 if (!tnlskb) {
2067 pr_warn("%sunable to send packet\n", link_co_err);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002068 return;
2069 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002070 skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
2071 skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
2072 __skb_queue_tail(&tnlq, tnlskb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002073 }
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002074 if (queue != &l->backlogq) {
2075 queue = &l->backlogq;
2076 goto tnl;
Jon Paul Maloydd3f9e72015-05-14 10:46:18 -04002077 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002078
Tuong Lien2320bcd2019-07-24 08:56:12 +07002079 if (pktcnt_need_update)
2080 skb_queue_walk(&tnlq, skb) {
2081 hdr = buf_msg(skb);
2082 msg_set_msgcnt(hdr, pktcnt);
2083 }
2084
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002085 tipc_link_xmit(tnl, &tnlq, xmitq);
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05002086
Jon Paul Maloy6e498152015-07-30 18:24:19 -04002087 if (mtyp == FAILOVER_MSG) {
2088 tnl->drop_point = l->rcv_nxt;
2089 tnl->failover_reasm_skb = l->reasm_buf;
2090 l->reasm_buf = NULL;
Tuong Lien58ee86b2019-04-04 11:09:53 +07002091
2092 /* Failover the link's deferdq */
2093 if (unlikely(!skb_queue_empty(fdefq))) {
2094 pr_warn("Link failover deferdq not empty: %d!\n",
2095 skb_queue_len(fdefq));
2096 __skb_queue_purge(fdefq);
2097 }
2098 skb_queue_splice_init(&l->deferdq, fdefq);
Jon Paul Maloyf006c9c2014-02-13 17:29:11 -05002099 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002100}
2101
Tuong Lienc0b14a02019-05-02 17:23:23 +07002102/**
2103 * tipc_link_failover_prepare() - prepare tnl for link failover
2104 *
2105 * This is a special version of the precursor - tipc_link_tnl_prepare(),
2106 * see the tipc_node_link_failover() for details
2107 *
2108 * @l: failover link
2109 * @tnl: tunnel link
2110 * @xmitq: queue for messages to be xmited
2111 */
2112void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl,
2113 struct sk_buff_head *xmitq)
2114{
2115 struct sk_buff_head *fdefq = &tnl->failover_deferdq;
2116
2117 tipc_link_create_dummy_tnl_msg(tnl, xmitq);
2118
Geert Uytterhoeven8ebed8a2019-10-24 17:30:43 +02002119 /* This failover link endpoint was never established before,
Tuong Lienc0b14a02019-05-02 17:23:23 +07002120 * so it has not received anything from peer.
2121 * Otherwise, it must be a normal failover situation or the
2122 * node has entered SELF_DOWN_PEER_LEAVING and both peer nodes
2123 * would have to start over from scratch instead.
2124 */
Tuong Lienc0b14a02019-05-02 17:23:23 +07002125 tnl->drop_point = 1;
2126 tnl->failover_reasm_skb = NULL;
2127
2128 /* Initiate the link's failover deferdq */
2129 if (unlikely(!skb_queue_empty(fdefq))) {
2130 pr_warn("Link failover deferdq not empty: %d!\n",
2131 skb_queue_len(fdefq));
2132 __skb_queue_purge(fdefq);
2133 }
2134}
2135
Jon Maloy7ea817f2018-07-10 01:07:36 +02002136/* tipc_link_validate_msg(): validate message against current link state
2137 * Returns true if message should be accepted, otherwise false
2138 */
2139bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr)
2140{
2141 u16 curr_session = l->peer_session;
2142 u16 session = msg_session(hdr);
2143 int mtyp = msg_type(hdr);
2144
2145 if (msg_user(hdr) != LINK_PROTOCOL)
2146 return true;
2147
2148 switch (mtyp) {
2149 case RESET_MSG:
2150 if (!l->in_session)
2151 return true;
2152 /* Accept only RESET with new session number */
2153 return more(session, curr_session);
2154 case ACTIVATE_MSG:
2155 if (!l->in_session)
2156 return true;
2157 /* Accept only ACTIVATE with new or current session number */
2158 return !less(session, curr_session);
2159 case STATE_MSG:
2160 /* Accept only STATE with current session number */
2161 if (!l->in_session)
2162 return false;
2163 if (session != curr_session)
2164 return false;
LUU Duc Canhd949cfe2018-09-26 22:28:52 +02002165 /* Extra sanity check */
2166 if (!link_is_up(l) && msg_ack(hdr))
2167 return false;
Jon Maloy7ea817f2018-07-10 01:07:36 +02002168 if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO))
2169 return true;
2170 /* Accept only STATE with new sequence number */
2171 return !less(msg_seqno(hdr), l->rcv_nxt_state);
2172 default:
2173 return false;
2174 }
2175}
2176
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002177/* tipc_link_proto_rcv(): receive link level protocol message :
2178 * Note that network plane id propagates through the network, and may
2179 * change at any time. The node with lowest numerical id determines
2180 * network plane
2181 */
2182static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
2183 struct sk_buff_head *xmitq)
2184{
2185 struct tipc_msg *hdr = buf_msg(skb);
Tuong Lien91959482019-04-04 11:09:51 +07002186 struct tipc_gap_ack_blks *ga = NULL;
Tuong Liend7626b52020-05-26 16:38:34 +07002187 bool reply = msg_probe(hdr), retransmitted = false;
2188 u16 dlen = msg_data_sz(hdr), glen = 0;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002189 u16 peers_snd_nxt = msg_next_sent(hdr);
2190 u16 peers_tol = msg_link_tolerance(hdr);
2191 u16 peers_prio = msg_linkprio(hdr);
Tuong Liend7626b52020-05-26 16:38:34 +07002192 u16 gap = msg_seq_gap(hdr);
2193 u16 ack = msg_ack(hdr);
Jon Paul Maloy2be80c22015-08-20 02:12:56 -04002194 u16 rcv_nxt = l->rcv_nxt;
Tuong Liend7626b52020-05-26 16:38:34 +07002195 u16 rcvgap = 0;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04002196 int mtyp = msg_type(hdr);
Tuong Liend7626b52020-05-26 16:38:34 +07002197 int rc = 0, released;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002198 char *if_name;
Tuong Liend7626b52020-05-26 16:38:34 +07002199 void *data;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002200
Tuong Lien26574db2018-12-19 09:17:57 +07002201 trace_tipc_proto_rcv(skb, false, l->name);
Jon Paul Maloy52666982015-10-22 08:51:41 -04002202 if (tipc_link_is_blocked(l) || !xmitq)
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002203 goto exit;
2204
Jon Paul Maloye74a3862016-03-03 14:23:21 -05002205 if (tipc_own_addr(l->net) > msg_prevnode(hdr))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002206 l->net_plane = msg_net_plane(hdr);
2207
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04002208 skb_linearize(skb);
2209 hdr = buf_msg(skb);
2210 data = msg_data(hdr);
2211
Tuong Lien26574db2018-12-19 09:17:57 +07002212 if (!tipc_link_validate_msg(l, hdr)) {
2213 trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!");
2214 trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!");
Jon Maloy7ea817f2018-07-10 01:07:36 +02002215 goto exit;
Tuong Lien26574db2018-12-19 09:17:57 +07002216 }
Jon Maloy7ea817f2018-07-10 01:07:36 +02002217
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04002218 switch (mtyp) {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002219 case RESET_MSG:
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002220 case ACTIVATE_MSG:
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002221 /* Complete own link name with peer's interface name */
2222 if_name = strrchr(l->name, ':') + 1;
2223 if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
2224 break;
2225 if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
2226 break;
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04002227 strncpy(if_name, data, TIPC_MAX_IF_NAME);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002228
2229 /* Update own tolerance if peer indicates a non-zero value */
Jon Maloy047491e2018-10-10 17:34:01 +02002230 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002231 l->tolerance = peers_tol;
Jon Maloy047491e2018-10-10 17:34:01 +02002232 l->bc_rcvlink->tolerance = peers_tol;
2233 }
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002234 /* Update own priority if peer's priority is higher */
2235 if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
2236 l->priority = peers_prio;
2237
Jon Maloy7ab412d2018-11-10 17:30:24 -05002238 /* If peer is going down we want full re-establish cycle */
2239 if (msg_peer_stopping(hdr)) {
Jon Paul Maloy634696b2016-04-15 13:33:03 -04002240 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
Jon Maloy7ab412d2018-11-10 17:30:24 -05002241 break;
2242 }
Tuong Lien91986ee2019-02-11 13:29:43 +07002243
2244 /* If this endpoint was re-created while peer was ESTABLISHING
2245 * it doesn't know current session number. Force re-synch.
2246 */
2247 if (mtyp == ACTIVATE_MSG && msg_dest_session_valid(hdr) &&
2248 l->session != msg_dest_session(hdr)) {
2249 if (less(l->session, msg_dest_session(hdr)))
2250 l->session = msg_dest_session(hdr) + 1;
2251 break;
2252 }
2253
Jon Maloy7ab412d2018-11-10 17:30:24 -05002254 /* ACTIVATE_MSG serves as PEER_RESET if link is already down */
2255 if (mtyp == RESET_MSG || !link_is_up(l))
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04002256 rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
2257
2258 /* ACTIVATE_MSG takes up link if it was already locally reset */
Jon Maloy7ab412d2018-11-10 17:30:24 -05002259 if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING)
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04002260 rc = TIPC_LINK_UP_EVT;
2261
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002262 l->peer_session = msg_session(hdr);
Jon Maloy7ea817f2018-07-10 01:07:36 +02002263 l->in_session = true;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002264 l->peer_bearer_id = msg_bearer_id(hdr);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002265 if (l->mtu > msg_max_pkt(hdr))
2266 l->mtu = msg_max_pkt(hdr);
2267 break;
Jon Paul Maloy662921c2015-07-30 18:24:21 -04002268
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002269 case STATE_MSG:
Jon Maloy9012de52018-07-10 01:07:35 +02002270 l->rcv_nxt_state = msg_seqno(hdr) + 1;
2271
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002272 /* Update own tolerance if peer indicates a non-zero value */
Jon Maloy047491e2018-10-10 17:34:01 +02002273 if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002274 l->tolerance = peers_tol;
Jon Maloy047491e2018-10-10 17:34:01 +02002275 l->bc_rcvlink->tolerance = peers_tol;
2276 }
Jon Paul Maloyf7967552016-11-23 21:05:26 -05002277 /* Update own prio if peer indicates a different value */
2278 if ((peers_prio != l->priority) &&
2279 in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) {
Richard Alpe81729812016-02-01 08:19:57 +01002280 l->priority = peers_prio;
2281 rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
2282 }
2283
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002284 l->silent_intv_cnt = 0;
2285 l->stats.recv_states++;
2286 if (msg_probe(hdr))
2287 l->stats.recv_probes++;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04002288
2289 if (!link_is_up(l)) {
2290 if (l->state == LINK_ESTABLISHING)
2291 rc = TIPC_LINK_UP_EVT;
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002292 break;
Jon Paul Maloy73f646c2015-10-15 14:52:44 -04002293 }
Tuong Lien91959482019-04-04 11:09:51 +07002294
2295 /* Receive Gap ACK blocks from peer if any */
Tuong Liend7626b52020-05-26 16:38:34 +07002296 glen = tipc_get_gap_ack_blks(&ga, l, hdr, true);
Tuong Lien91959482019-04-04 11:09:51 +07002297
2298 tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr,
Jon Paul Maloy35c55c92016-06-13 20:46:22 -04002299 &l->mon_state, l->bearer_id);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002300
Jon Paul Maloy662921c2015-07-30 18:24:21 -04002301 /* Send NACK if peer has sent pkts we haven't received yet */
Jon Maloyd3b09992019-12-10 00:52:45 +01002302 if ((reply || msg_is_keepalive(hdr)) &&
2303 more(peers_snd_nxt, rcv_nxt) &&
2304 !tipc_link_is_synching(l) &&
2305 skb_queue_empty(&l->deferdq))
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002306 rcvgap = peers_snd_nxt - l->rcv_nxt;
Jon Maloy8d6e79d2017-11-08 09:59:26 +01002307 if (rcvgap || reply)
2308 tipc_link_build_proto_msg(l, STATE_MSG, 0, reply,
2309 rcvgap, 0, 0, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002310
Tuong Liend7626b52020-05-26 16:38:34 +07002311 released = tipc_link_advance_transmq(l, l, ack, gap, ga, xmitq,
2312 &retransmitted, &rc);
Tuong Lien91959482019-04-04 11:09:51 +07002313 if (gap)
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002314 l->stats.recv_nacks++;
Tuong Liend7626b52020-05-26 16:38:34 +07002315 if (released || retransmitted)
2316 tipc_link_update_cwin(l, released, retransmitted);
2317 if (released)
2318 tipc_link_advance_backlog(l, xmitq);
Jon Paul Maloyd9992972015-07-16 16:54:31 -04002319 if (unlikely(!skb_queue_empty(&l->wakeupq)))
2320 link_prepare_wakeup(l);
2321 }
2322exit:
2323 kfree_skb(skb);
2324 return rc;
2325}
2326
Jon Paul Maloy52666982015-10-22 08:51:41 -04002327/* tipc_link_build_bc_proto_msg() - create broadcast protocol message
2328 */
2329static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast,
2330 u16 peers_snd_nxt,
2331 struct sk_buff_head *xmitq)
2332{
2333 struct sk_buff *skb;
2334 struct tipc_msg *hdr;
2335 struct sk_buff *dfrd_skb = skb_peek(&l->deferdq);
2336 u16 ack = l->rcv_nxt - 1;
2337 u16 gap_to = peers_snd_nxt - 1;
2338
2339 skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
Jon Paul Maloye74a3862016-03-03 14:23:21 -05002340 0, l->addr, tipc_own_addr(l->net), 0, 0, 0);
Jon Paul Maloy52666982015-10-22 08:51:41 -04002341 if (!skb)
2342 return false;
2343 hdr = buf_msg(skb);
2344 msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1);
2345 msg_set_bcast_ack(hdr, ack);
2346 msg_set_bcgap_after(hdr, ack);
2347 if (dfrd_skb)
2348 gap_to = buf_seqno(dfrd_skb) - 1;
2349 msg_set_bcgap_to(hdr, gap_to);
2350 msg_set_non_seq(hdr, bcast);
2351 __skb_queue_tail(xmitq, skb);
2352 return true;
2353}
2354
2355/* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints.
2356 *
2357 * Give a newly added peer node the sequence number where it should
2358 * start receiving and acking broadcast packets.
2359 */
Wu Fengguang742e0382015-10-24 22:56:01 +08002360static void tipc_link_build_bc_init_msg(struct tipc_link *l,
2361 struct sk_buff_head *xmitq)
Jon Paul Maloy52666982015-10-22 08:51:41 -04002362{
2363 struct sk_buff_head list;
2364
2365 __skb_queue_head_init(&list);
2366 if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list))
2367 return;
Jon Paul Maloy06bd2b12016-10-27 18:51:55 -04002368 msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true);
Jon Paul Maloy52666982015-10-22 08:51:41 -04002369 tipc_link_xmit(l, &list, xmitq);
2370}
2371
2372/* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer
2373 */
2374void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr)
2375{
2376 int mtyp = msg_type(hdr);
2377 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
2378
2379 if (link_is_up(l))
2380 return;
2381
2382 if (msg_user(hdr) == BCAST_PROTOCOL) {
2383 l->rcv_nxt = peers_snd_nxt;
2384 l->state = LINK_ESTABLISHED;
2385 return;
2386 }
2387
2388 if (l->peer_caps & TIPC_BCAST_SYNCH)
2389 return;
2390
2391 if (msg_peer_node_is_up(hdr))
2392 return;
2393
2394 /* Compatibility: accept older, less safe initial synch data */
2395 if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG))
2396 l->rcv_nxt = peers_snd_nxt;
2397}
2398
2399/* tipc_link_bc_sync_rcv - update rcv link according to peer's send state
2400 */
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002401int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
2402 struct sk_buff_head *xmitq)
Jon Paul Maloy52666982015-10-22 08:51:41 -04002403{
2404 u16 peers_snd_nxt = msg_bc_snd_nxt(hdr);
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002405 int rc = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002406
2407 if (!link_is_up(l))
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002408 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002409
2410 if (!msg_peer_node_is_up(hdr))
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002411 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002412
Randy Dunlapa99df442020-11-29 10:32:44 -08002413 /* Open when peer acknowledges our bcast init msg (pkt #1) */
Jon Paul Maloy2d18ac42016-07-11 16:08:35 -04002414 if (msg_ack(hdr))
2415 l->bc_peer_is_up = true;
2416
2417 if (!l->bc_peer_is_up)
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002418 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002419
2420 /* Ignore if peers_snd_nxt goes beyond receive window */
2421 if (more(peers_snd_nxt, l->rcv_nxt + l->window))
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002422 return rc;
2423
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002424 l->snd_nxt = peers_snd_nxt;
2425 if (link_bc_rcv_gap(l))
2426 rc |= TIPC_LINK_SND_STATE;
2427
2428 /* Return now if sender supports nack via STATE messages */
2429 if (l->peer_caps & TIPC_BCAST_STATE_NACK)
2430 return rc;
2431
2432 /* Otherwise, be backwards compatible */
Jon Paul Maloy52666982015-10-22 08:51:41 -04002433
2434 if (!more(peers_snd_nxt, l->rcv_nxt)) {
2435 l->nack_state = BC_NACK_SND_CONDITIONAL;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002436 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002437 }
2438
2439 /* Don't NACK if one was recently sent or peeked */
2440 if (l->nack_state == BC_NACK_SND_SUPPRESS) {
2441 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002442 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002443 }
2444
2445 /* Conditionally delay NACK sending until next synch rcv */
2446 if (l->nack_state == BC_NACK_SND_CONDITIONAL) {
2447 l->nack_state = BC_NACK_SND_UNCONDITIONAL;
2448 if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN)
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002449 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002450 }
2451
2452 /* Send NACK now but suppress next one */
2453 tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq);
2454 l->nack_state = BC_NACK_SND_SUPPRESS;
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002455 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002456}
2457
Tuong Liend7626b52020-05-26 16:38:34 +07002458int tipc_link_bc_ack_rcv(struct tipc_link *r, u16 acked, u16 gap,
2459 struct tipc_gap_ack_blks *ga,
Tuong Liena91d55d2020-05-26 16:38:36 +07002460 struct sk_buff_head *xmitq,
2461 struct sk_buff_head *retrq)
Jon Paul Maloy52666982015-10-22 08:51:41 -04002462{
Tuong Liend7626b52020-05-26 16:38:34 +07002463 struct tipc_link *l = r->bc_sndlink;
2464 bool unused = false;
2465 int rc = 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002466
Tuong Liend7626b52020-05-26 16:38:34 +07002467 if (!link_is_up(r) || !r->bc_peer_is_up)
2468 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002469
Tuong Lien03b6fef2020-05-26 16:38:37 +07002470 if (gap) {
2471 l->stats.recv_nacks++;
2472 r->stats.recv_nacks++;
2473 }
2474
Tuong Liend7626b52020-05-26 16:38:34 +07002475 if (less(acked, r->acked) || (acked == r->acked && !gap && !ga))
2476 return 0;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002477
Tuong Lienc6ed7a52020-05-26 16:38:35 +07002478 trace_tipc_link_bc_ack(r, acked, gap, &l->transmq);
Tuong Liena91d55d2020-05-26 16:38:36 +07002479 tipc_link_advance_transmq(l, r, acked, gap, ga, retrq, &unused, &rc);
Jon Paul Maloy52666982015-10-22 08:51:41 -04002480
Tuong Liend7626b52020-05-26 16:38:34 +07002481 tipc_link_advance_backlog(l, xmitq);
2482 if (unlikely(!skb_queue_empty(&l->wakeupq)))
2483 link_prepare_wakeup(l);
2484
2485 return rc;
Jon Paul Maloy52666982015-10-22 08:51:41 -04002486}
2487
2488/* tipc_link_bc_nack_rcv(): receive broadcast nack message
Jon Paul Maloy02d11ca2016-09-01 13:52:49 -04002489 * This function is here for backwards compatibility, since
2490 * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5.
Jon Paul Maloy52666982015-10-22 08:51:41 -04002491 */
2492int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
2493 struct sk_buff_head *xmitq)
2494{
2495 struct tipc_msg *hdr = buf_msg(skb);
2496 u32 dnode = msg_destnode(hdr);
2497 int mtyp = msg_type(hdr);
2498 u16 acked = msg_bcast_ack(hdr);
2499 u16 from = acked + 1;
2500 u16 to = msg_bcgap_to(hdr);
2501 u16 peers_snd_nxt = to + 1;
2502 int rc = 0;
2503
2504 kfree_skb(skb);
2505
2506 if (!tipc_link_is_up(l) || !l->bc_peer_is_up)
2507 return 0;
2508
2509 if (mtyp != STATE_MSG)
2510 return 0;
2511
Jon Paul Maloye74a3862016-03-03 14:23:21 -05002512 if (dnode == tipc_own_addr(l->net)) {
Tuong Liena91d55d2020-05-26 16:38:36 +07002513 rc = tipc_link_bc_ack_rcv(l, acked, to - acked, NULL, xmitq,
2514 xmitq);
Jon Paul Maloy52666982015-10-22 08:51:41 -04002515 l->stats.recv_nacks++;
2516 return rc;
2517 }
2518
2519 /* Msg for other node => suppress own NACK at next sync if applicable */
2520 if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from))
2521 l->nack_state = BC_NACK_SND_SUPPRESS;
2522
2523 return 0;
2524}
2525
Jon Maloy16ad3f42019-12-10 00:52:46 +01002526void tipc_link_set_queue_limits(struct tipc_link *l, u32 min_win, u32 max_win)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002527{
Jon Maloy218527f2018-03-29 23:20:41 +02002528 int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE);
Jon Paul Maloy05dcc5a2015-03-13 16:08:10 -04002529
Jon Maloy16ad3f42019-12-10 00:52:46 +01002530 l->min_win = min_win;
2531 l->ssthresh = max_win;
2532 l->max_win = max_win;
2533 l->window = min_win;
2534 l->backlog[TIPC_LOW_IMPORTANCE].limit = min_win * 2;
2535 l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = min_win * 4;
2536 l->backlog[TIPC_HIGH_IMPORTANCE].limit = min_win * 6;
2537 l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = min_win * 8;
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04002538 l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002539}
2540
Allan Stephens5c216e12011-10-18 11:34:29 -04002541/**
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002542 * link_reset_stats - reset link statistics
Jon Paul Maloy1a906322015-11-19 14:30:47 -05002543 * @l: pointer to link
Per Lidenb97bf3f2006-01-02 19:04:38 +01002544 */
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002545void tipc_link_reset_stats(struct tipc_link *l)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002546{
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002547 memset(&l->stats, 0, sizeof(l->stats));
Per Lidenb97bf3f2006-01-02 19:04:38 +01002548}
2549
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04002550static void link_print(struct tipc_link *l, const char *str)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002551{
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04002552 struct sk_buff *hskb = skb_peek(&l->transmq);
Jon Paul Maloyc1ab3f1d2015-10-22 08:51:38 -04002553 u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1;
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04002554 u16 tail = l->snd_nxt - 1;
Ying Xue7a2f7d12014-04-21 10:55:46 +08002555
Jon Paul Maloy662921c2015-07-30 18:24:21 -04002556 pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
Jon Paul Maloy1a20cc22015-07-16 16:54:30 -04002557 pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
2558 skb_queue_len(&l->transmq), head, tail,
2559 skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002560}
Richard Alpe0655f6a2014-11-20 10:29:07 +01002561
2562/* Parse and validate nested (link) properties valid for media, bearer and link
2563 */
2564int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
2565{
2566 int err;
2567
Johannes Berg8cb08172019-04-26 14:07:28 +02002568 err = nla_parse_nested_deprecated(props, TIPC_NLA_PROP_MAX, prop,
2569 tipc_nl_prop_policy, NULL);
Richard Alpe0655f6a2014-11-20 10:29:07 +01002570 if (err)
2571 return err;
2572
2573 if (props[TIPC_NLA_PROP_PRIO]) {
2574 u32 prio;
2575
2576 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2577 if (prio > TIPC_MAX_LINK_PRI)
2578 return -EINVAL;
2579 }
2580
2581 if (props[TIPC_NLA_PROP_TOL]) {
2582 u32 tol;
2583
2584 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2585 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
2586 return -EINVAL;
2587 }
2588
2589 if (props[TIPC_NLA_PROP_WIN]) {
Jon Maloy16ad3f42019-12-10 00:52:46 +01002590 u32 max_win;
Richard Alpe0655f6a2014-11-20 10:29:07 +01002591
Jon Maloy16ad3f42019-12-10 00:52:46 +01002592 max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2593 if (max_win < TIPC_DEF_LINK_WIN || max_win > TIPC_MAX_LINK_WIN)
Richard Alpe0655f6a2014-11-20 10:29:07 +01002594 return -EINVAL;
2595 }
2596
2597 return 0;
2598}
Richard Alpe7be57fc2014-11-20 10:29:12 +01002599
Richard Alped8182802014-11-24 11:10:29 +01002600static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
Richard Alpe7be57fc2014-11-20 10:29:12 +01002601{
2602 int i;
2603 struct nlattr *stats;
2604
2605 struct nla_map {
2606 u32 key;
2607 u32 val;
2608 };
2609
2610 struct nla_map map[] = {
Jon Paul Maloy95901122016-11-25 10:35:02 -05002611 {TIPC_NLA_STATS_RX_INFO, 0},
Richard Alpe7be57fc2014-11-20 10:29:12 +01002612 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
2613 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
2614 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
2615 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
Jon Paul Maloy95901122016-11-25 10:35:02 -05002616 {TIPC_NLA_STATS_TX_INFO, 0},
Richard Alpe7be57fc2014-11-20 10:29:12 +01002617 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
2618 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
2619 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
2620 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
2621 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
2622 s->msg_length_counts : 1},
2623 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
2624 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
2625 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
2626 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
2627 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
2628 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
2629 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
2630 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
2631 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
2632 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
2633 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
2634 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
2635 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
2636 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
2637 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
2638 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
2639 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
2640 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
2641 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
2642 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
2643 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
2644 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
2645 (s->accu_queue_sz / s->queue_sz_counts) : 0}
2646 };
2647
Michal Kubecekae0be8d2019-04-26 11:13:06 +02002648 stats = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002649 if (!stats)
2650 return -EMSGSIZE;
2651
2652 for (i = 0; i < ARRAY_SIZE(map); i++)
2653 if (nla_put_u32(skb, map[i].key, map[i].val))
2654 goto msg_full;
2655
2656 nla_nest_end(skb, stats);
2657
2658 return 0;
2659msg_full:
2660 nla_nest_cancel(skb, stats);
2661
2662 return -EMSGSIZE;
2663}
2664
2665/* Caller should hold appropriate locks to protect the link */
Jon Paul Maloy5be9c082015-11-19 14:30:45 -05002666int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
2667 struct tipc_link *link, int nlflags)
Richard Alpe7be57fc2014-11-20 10:29:12 +01002668{
Jon Maloy23fd3ea2018-03-22 20:42:49 +01002669 u32 self = tipc_own_addr(net);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002670 struct nlattr *attrs;
2671 struct nlattr *prop;
Jon Maloy23fd3ea2018-03-22 20:42:49 +01002672 void *hdr;
2673 int err;
Richard Alpe7be57fc2014-11-20 10:29:12 +01002674
Richard Alpebfb3e5d2015-02-09 09:50:03 +01002675 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
Nicolas Dichtelf2f67392015-04-28 18:33:50 +02002676 nlflags, TIPC_NL_LINK_GET);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002677 if (!hdr)
2678 return -EMSGSIZE;
2679
Michal Kubecekae0be8d2019-04-26 11:13:06 +02002680 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002681 if (!attrs)
2682 goto msg_full;
2683
2684 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
2685 goto attr_msg_full;
Jon Maloy23fd3ea2018-03-22 20:42:49 +01002686 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self)))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002687 goto attr_msg_full;
Jon Paul Maloyed193ec2015-04-02 09:33:02 -04002688 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002689 goto attr_msg_full;
Jon Paul Maloy95901122016-11-25 10:35:02 -05002690 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002691 goto attr_msg_full;
Jon Paul Maloy95901122016-11-25 10:35:02 -05002692 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002693 goto attr_msg_full;
2694
2695 if (tipc_link_is_up(link))
2696 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2697 goto attr_msg_full;
Jon Paul Maloyc72fa872015-10-22 08:51:46 -04002698 if (link->active)
Richard Alpe7be57fc2014-11-20 10:29:12 +01002699 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
2700 goto attr_msg_full;
2701
Michal Kubecekae0be8d2019-04-26 11:13:06 +02002702 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP);
Richard Alpe7be57fc2014-11-20 10:29:12 +01002703 if (!prop)
2704 goto attr_msg_full;
2705 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2706 goto prop_msg_full;
2707 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
2708 goto prop_msg_full;
2709 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
Jon Paul Maloy1f66d162015-03-25 12:07:24 -04002710 link->window))
Richard Alpe7be57fc2014-11-20 10:29:12 +01002711 goto prop_msg_full;
2712 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2713 goto prop_msg_full;
2714 nla_nest_end(msg->skb, prop);
2715
2716 err = __tipc_nl_add_stats(msg->skb, &link->stats);
2717 if (err)
2718 goto attr_msg_full;
2719
2720 nla_nest_end(msg->skb, attrs);
2721 genlmsg_end(msg->skb, hdr);
2722
2723 return 0;
2724
2725prop_msg_full:
2726 nla_nest_cancel(msg->skb, prop);
2727attr_msg_full:
2728 nla_nest_cancel(msg->skb, attrs);
2729msg_full:
2730 genlmsg_cancel(msg->skb, hdr);
2731
2732 return -EMSGSIZE;
2733}
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002734
2735static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb,
2736 struct tipc_stats *stats)
2737{
2738 int i;
2739 struct nlattr *nest;
2740
2741 struct nla_map {
2742 __u32 key;
2743 __u32 val;
2744 };
2745
2746 struct nla_map map[] = {
Jon Paul Maloy95901122016-11-25 10:35:02 -05002747 {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts},
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002748 {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments},
2749 {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented},
2750 {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles},
2751 {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled},
Jon Paul Maloy95901122016-11-25 10:35:02 -05002752 {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts},
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002753 {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments},
2754 {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented},
2755 {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles},
2756 {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled},
2757 {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks},
2758 {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv},
2759 {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks},
2760 {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks},
2761 {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted},
2762 {TIPC_NLA_STATS_DUPLICATES, stats->duplicates},
2763 {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs},
2764 {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz},
2765 {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ?
2766 (stats->accu_queue_sz / stats->queue_sz_counts) : 0}
2767 };
2768
Michal Kubecekae0be8d2019-04-26 11:13:06 +02002769 nest = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002770 if (!nest)
2771 return -EMSGSIZE;
2772
2773 for (i = 0; i < ARRAY_SIZE(map); i++)
2774 if (nla_put_u32(skb, map[i].key, map[i].val))
2775 goto msg_full;
2776
2777 nla_nest_end(skb, nest);
2778
2779 return 0;
2780msg_full:
2781 nla_nest_cancel(skb, nest);
2782
2783 return -EMSGSIZE;
2784}
2785
Tuong Lien03b6fef2020-05-26 16:38:37 +07002786int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg,
2787 struct tipc_link *bcl)
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002788{
2789 int err;
2790 void *hdr;
2791 struct nlattr *attrs;
2792 struct nlattr *prop;
Hoang Huu Lecad29292020-06-17 13:56:05 +07002793 u32 bc_mode = tipc_bcast_get_mode(net);
Hoang Le02ec6ca2019-03-19 18:49:48 +07002794 u32 bc_ratio = tipc_bcast_get_broadcast_ratio(net);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002795
2796 if (!bcl)
2797 return 0;
2798
2799 tipc_bcast_lock(net);
2800
2801 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
2802 NLM_F_MULTI, TIPC_NL_LINK_GET);
Insu Yunb53ce3e2016-02-17 11:47:35 -05002803 if (!hdr) {
2804 tipc_bcast_unlock(net);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002805 return -EMSGSIZE;
Insu Yunb53ce3e2016-02-17 11:47:35 -05002806 }
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002807
Michal Kubecekae0be8d2019-04-26 11:13:06 +02002808 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002809 if (!attrs)
2810 goto msg_full;
2811
2812 /* The broadcast link is always up */
2813 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2814 goto attr_msg_full;
2815
2816 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST))
2817 goto attr_msg_full;
2818 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name))
2819 goto attr_msg_full;
Jon Paul Maloy95901122016-11-25 10:35:02 -05002820 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0))
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002821 goto attr_msg_full;
Jon Paul Maloy95901122016-11-25 10:35:02 -05002822 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0))
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002823 goto attr_msg_full;
2824
Michal Kubecekae0be8d2019-04-26 11:13:06 +02002825 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002826 if (!prop)
2827 goto attr_msg_full;
Jon Maloy16ad3f42019-12-10 00:52:46 +01002828 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->max_win))
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002829 goto prop_msg_full;
Hoang Le02ec6ca2019-03-19 18:49:48 +07002830 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST, bc_mode))
2831 goto prop_msg_full;
2832 if (bc_mode & BCLINK_MODE_SEL)
2833 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST_RATIO,
2834 bc_ratio))
2835 goto prop_msg_full;
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002836 nla_nest_end(msg->skb, prop);
2837
2838 err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats);
2839 if (err)
2840 goto attr_msg_full;
2841
2842 tipc_bcast_unlock(net);
2843 nla_nest_end(msg->skb, attrs);
2844 genlmsg_end(msg->skb, hdr);
2845
2846 return 0;
2847
2848prop_msg_full:
2849 nla_nest_cancel(msg->skb, prop);
2850attr_msg_full:
2851 nla_nest_cancel(msg->skb, attrs);
2852msg_full:
2853 tipc_bcast_unlock(net);
2854 genlmsg_cancel(msg->skb, hdr);
2855
2856 return -EMSGSIZE;
2857}
2858
Richard Alped01332f2016-02-01 08:19:56 +01002859void tipc_link_set_tolerance(struct tipc_link *l, u32 tol,
2860 struct sk_buff_head *xmitq)
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002861{
2862 l->tolerance = tol;
Jon Maloy047491e2018-10-10 17:34:01 +02002863 if (l->bc_rcvlink)
2864 l->bc_rcvlink->tolerance = tol;
Jon Maloy37c64cf2018-02-14 13:34:39 +01002865 if (link_is_up(l))
2866 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002867}
2868
Richard Alped01332f2016-02-01 08:19:56 +01002869void tipc_link_set_prio(struct tipc_link *l, u32 prio,
2870 struct sk_buff_head *xmitq)
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002871{
2872 l->priority = prio;
Jon Maloy8d6e79d2017-11-08 09:59:26 +01002873 tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq);
Jon Paul Maloy38206d52015-11-19 14:30:46 -05002874}
2875
2876void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit)
2877{
2878 l->abort_limit = limit;
2879}
Tuong Lienb4b97712018-12-19 09:17:56 +07002880
Tuong Lienb4b97712018-12-19 09:17:56 +07002881/**
2882 * tipc_link_dump - dump TIPC link data
2883 * @l: tipc link to be dumped
2884 * @dqueues: bitmask to decide if any link queue to be dumped?
2885 * - TIPC_DUMP_NONE: don't dump link queues
2886 * - TIPC_DUMP_TRANSMQ: dump link transmq queue
2887 * - TIPC_DUMP_BACKLOGQ: dump link backlog queue
2888 * - TIPC_DUMP_DEFERDQ: dump link deferd queue
2889 * - TIPC_DUMP_INPUTQ: dump link input queue
2890 * - TIPC_DUMP_WAKEUP: dump link wakeup queue
2891 * - TIPC_DUMP_ALL: dump all the link queues above
2892 * @buf: returned buffer of dump data in format
2893 */
2894int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf)
2895{
2896 int i = 0;
2897 size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN;
2898 struct sk_buff_head *list;
2899 struct sk_buff *hskb, *tskb;
2900 u32 len;
2901
2902 if (!l) {
2903 i += scnprintf(buf, sz, "link data: (null)\n");
2904 return i;
2905 }
2906
2907 i += scnprintf(buf, sz, "link data: %x", l->addr);
2908 i += scnprintf(buf + i, sz - i, " %x", l->state);
2909 i += scnprintf(buf + i, sz - i, " %u", l->in_session);
2910 i += scnprintf(buf + i, sz - i, " %u", l->session);
2911 i += scnprintf(buf + i, sz - i, " %u", l->peer_session);
2912 i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt);
2913 i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt);
2914 i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state);
2915 i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state);
2916 i += scnprintf(buf + i, sz - i, " %x", l->peer_caps);
2917 i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt);
2918 i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt);
Tuong Lien71204232019-08-15 10:24:08 +07002919 i += scnprintf(buf + i, sz - i, " %u", 0);
Jon Maloy77cf8ed2019-06-25 17:36:43 +02002920 i += scnprintf(buf + i, sz - i, " %u", 0);
Tuong Lienb4b97712018-12-19 09:17:56 +07002921 i += scnprintf(buf + i, sz - i, " %u", l->acked);
2922
2923 list = &l->transmq;
2924 len = skb_queue_len(list);
2925 hskb = skb_peek(list);
2926 tskb = skb_peek_tail(list);
2927 i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
2928 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2929 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2930
2931 list = &l->deferdq;
2932 len = skb_queue_len(list);
2933 hskb = skb_peek(list);
2934 tskb = skb_peek_tail(list);
2935 i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
2936 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2937 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2938
2939 list = &l->backlogq;
2940 len = skb_queue_len(list);
2941 hskb = skb_peek(list);
2942 tskb = skb_peek_tail(list);
2943 i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
2944 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2945 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2946
2947 list = l->inputq;
2948 len = skb_queue_len(list);
2949 hskb = skb_peek(list);
2950 tskb = skb_peek_tail(list);
2951 i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len,
2952 (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
2953 (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
2954
2955 if (dqueues & TIPC_DUMP_TRANSMQ) {
2956 i += scnprintf(buf + i, sz - i, "transmq: ");
2957 i += tipc_list_dump(&l->transmq, false, buf + i);
2958 }
2959 if (dqueues & TIPC_DUMP_BACKLOGQ) {
2960 i += scnprintf(buf + i, sz - i,
2961 "backlogq: <%u %u %u %u %u>, ",
2962 l->backlog[TIPC_LOW_IMPORTANCE].len,
2963 l->backlog[TIPC_MEDIUM_IMPORTANCE].len,
2964 l->backlog[TIPC_HIGH_IMPORTANCE].len,
2965 l->backlog[TIPC_CRITICAL_IMPORTANCE].len,
2966 l->backlog[TIPC_SYSTEM_IMPORTANCE].len);
2967 i += tipc_list_dump(&l->backlogq, false, buf + i);
2968 }
2969 if (dqueues & TIPC_DUMP_DEFERDQ) {
2970 i += scnprintf(buf + i, sz - i, "deferdq: ");
2971 i += tipc_list_dump(&l->deferdq, false, buf + i);
2972 }
2973 if (dqueues & TIPC_DUMP_INPUTQ) {
2974 i += scnprintf(buf + i, sz - i, "inputq: ");
2975 i += tipc_list_dump(l->inputq, false, buf + i);
2976 }
2977 if (dqueues & TIPC_DUMP_WAKEUP) {
2978 i += scnprintf(buf + i, sz - i, "wakeup: ");
2979 i += tipc_list_dump(&l->wakeupq, false, buf + i);
2980 }
2981
2982 return i;
2983}